err.no Git - linux-2.6/blob - fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/utsname.h>
  40 #include <linux/delay.h>
  41 #include <linux/errno.h>
  42 #include <linux/string.h>
  43 #include <linux/sunrpc/clnt.h>
  44 #include <linux/nfs.h>
  45 #include <linux/nfs4.h>
  46 #include <linux/nfs_fs.h>
  47 #include <linux/nfs_page.h>
  48 #include <linux/smp_lock.h>
  49 #include <linux/namei.h>
  50 #include <linux/mount.h>
  51
  52 #include "nfs4_fs.h"
  53 #include "delegation.h"
  54 #include "iostat.h"
  55
  56 #define NFSDBG_FACILITY         NFSDBG_PROC
  57
  58 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  59 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  60
  61 struct nfs4_opendata;
  62 static int _nfs4_proc_open(struct nfs4_opendata *data);
  63 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  64 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *);
  65 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry);
  66 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception);
  67 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp);
  68 static int _nfs4_do_access(struct inode *inode, struct rpc_cred *cred, int openflags);
  69 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  70 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  71
  72 /* Prevent leaks of NFSv4 errors into userland */
  73 int nfs4_map_errors(int err)
  74 {
  75         if (err < -1000) {
  76                 dprintk("%s could not handle NFSv4 error %d\n",
  77                                 __FUNCTION__, -err);
  78                 return -EIO;
  79         }
  80         return err;
  81 }
  82
  83 /*
  84  * This is our standard bitmap for GETATTR requests.
  85  */
  86 const u32 nfs4_fattr_bitmap[2] = {
  87         FATTR4_WORD0_TYPE
  88         | FATTR4_WORD0_CHANGE
  89         | FATTR4_WORD0_SIZE
  90         | FATTR4_WORD0_FSID
  91         | FATTR4_WORD0_FILEID,
  92         FATTR4_WORD1_MODE
  93         | FATTR4_WORD1_NUMLINKS
  94         | FATTR4_WORD1_OWNER
  95         | FATTR4_WORD1_OWNER_GROUP
  96         | FATTR4_WORD1_RAWDEV
  97         | FATTR4_WORD1_SPACE_USED
  98         | FATTR4_WORD1_TIME_ACCESS
  99         | FATTR4_WORD1_TIME_METADATA
 100         | FATTR4_WORD1_TIME_MODIFY
 101 };
 102
 103 const u32 nfs4_statfs_bitmap[2] = {
 104         FATTR4_WORD0_FILES_AVAIL
 105         | FATTR4_WORD0_FILES_FREE
 106         | FATTR4_WORD0_FILES_TOTAL,
 107         FATTR4_WORD1_SPACE_AVAIL
 108         | FATTR4_WORD1_SPACE_FREE
 109         | FATTR4_WORD1_SPACE_TOTAL
 110 };
 111
 112 const u32 nfs4_pathconf_bitmap[2] = {
 113         FATTR4_WORD0_MAXLINK
 114         | FATTR4_WORD0_MAXNAME,
 115         0
 116 };
 117
 118 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 119                         | FATTR4_WORD0_MAXREAD
 120                         | FATTR4_WORD0_MAXWRITE
 121                         | FATTR4_WORD0_LEASE_TIME,
 122                         0
 123 };
 124
 125 const u32 nfs4_fs_locations_bitmap[2] = {
 126         FATTR4_WORD0_TYPE
 127         | FATTR4_WORD0_CHANGE
 128         | FATTR4_WORD0_SIZE
 129         | FATTR4_WORD0_FSID
 130         | FATTR4_WORD0_FILEID
 131         | FATTR4_WORD0_FS_LOCATIONS,
 132         FATTR4_WORD1_MODE
 133         | FATTR4_WORD1_NUMLINKS
 134         | FATTR4_WORD1_OWNER
 135         | FATTR4_WORD1_OWNER_GROUP
 136         | FATTR4_WORD1_RAWDEV
 137         | FATTR4_WORD1_SPACE_USED
 138         | FATTR4_WORD1_TIME_ACCESS
 139         | FATTR4_WORD1_TIME_METADATA
 140         | FATTR4_WORD1_TIME_MODIFY
 141         | FATTR4_WORD1_MOUNTED_ON_FILEID
 142 };
 143
 144 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 145                 struct nfs4_readdir_arg *readdir)
 146 {
 147         __be32 *start, *p;
 148
 149         BUG_ON(readdir->count < 80);
 150         if (cookie > 2) {
 151                 readdir->cookie = cookie;
 152                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 153                 return;
 154         }
 155
 156         readdir->cookie = 0;
 157         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 158         if (cookie == 2)
 159                 return;
 160
 161         /*
 162          * NFSv4 servers do not return entries for '.' and '..'
 163          * Therefore, we fake these entries here.  We let '.'
 164          * have cookie 0 and '..' have cookie 1.  Note that
 165          * when talking to the server, we always send cookie 0
 166          * instead of 1 or 2.
 167          */
 168         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 169
 170         if (cookie == 0) {
 171                 *p++ = xdr_one;                                  /* next */
 172                 *p++ = xdr_zero;                   /* cookie, first word */
 173                 *p++ = xdr_one;                   /* cookie, second word */
 174                 *p++ = xdr_one;                             /* entry len */
 175                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 176                 p++;
 177                 *p++ = xdr_one;                         /* bitmap length */
 178                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 179                 *p++ = htonl(8);              /* attribute buffer length */
 180                 p = xdr_encode_hyper(p, dentry->d_inode->i_ino);
 181         }
 182
 183         *p++ = xdr_one;                                  /* next */
 184         *p++ = xdr_zero;                   /* cookie, first word */
 185         *p++ = xdr_two;                   /* cookie, second word */
 186         *p++ = xdr_two;                             /* entry len */
 187         memcpy(p, "..\0\0", 4);                         /* entry */
 188         p++;
 189         *p++ = xdr_one;                         /* bitmap length */
 190         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 191         *p++ = htonl(8);              /* attribute buffer length */
 192         p = xdr_encode_hyper(p, dentry->d_parent->d_inode->i_ino);
 193
 194         readdir->pgbase = (char *)p - (char *)start;
 195         readdir->count -= readdir->pgbase;
 196         kunmap_atomic(start, KM_USER0);
 197 }
 198
 199 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 200 {
 201         struct nfs_client *clp = server->nfs_client;
 202         spin_lock(&clp->cl_lock);
 203         if (time_before(clp->cl_last_renewal,timestamp))
 204                 clp->cl_last_renewal = timestamp;
 205         spin_unlock(&clp->cl_lock);
 206 }
 207
 208 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 209 {
 210         struct nfs_inode *nfsi = NFS_I(dir);
 211
 212         spin_lock(&dir->i_lock);
 213         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 214         if (cinfo->before == nfsi->change_attr && cinfo->atomic)
 215                 nfsi->change_attr = cinfo->after;
 216         spin_unlock(&dir->i_lock);
 217 }
 218
 219 struct nfs4_opendata {
 220         struct kref kref;
 221         struct nfs_openargs o_arg;
 222         struct nfs_openres o_res;
 223         struct nfs_open_confirmargs c_arg;
 224         struct nfs_open_confirmres c_res;
 225         struct nfs_fattr f_attr;
 226         struct nfs_fattr dir_attr;
 227         struct path path;
 228         struct dentry *dir;
 229         struct nfs4_state_owner *owner;
 230         struct nfs4_state *state;
 231         struct iattr attrs;
 232         unsigned long timestamp;
 233         unsigned int rpc_done : 1;
 234         int rpc_status;
 235         int cancelled;
 236 };
 237
 238
 239 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 240 {
 241         p->o_res.f_attr = &p->f_attr;
 242         p->o_res.dir_attr = &p->dir_attr;
 243         p->o_res.server = p->o_arg.server;
 244         nfs_fattr_init(&p->f_attr);
 245         nfs_fattr_init(&p->dir_attr);
 246 }
 247
 248 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
 249                 struct nfs4_state_owner *sp, int flags,
 250                 const struct iattr *attrs)
 251 {
 252         struct dentry *parent = dget_parent(path->dentry);
 253         struct inode *dir = parent->d_inode;
 254         struct nfs_server *server = NFS_SERVER(dir);
 255         struct nfs4_opendata *p;
 256
 257         p = kzalloc(sizeof(*p), GFP_KERNEL);
 258         if (p == NULL)
 259                 goto err;
 260         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 261         if (p->o_arg.seqid == NULL)
 262                 goto err_free;
 263         p->path.mnt = mntget(path->mnt);
 264         p->path.dentry = dget(path->dentry);
 265         p->dir = parent;
 266         p->owner = sp;
 267         atomic_inc(&sp->so_count);
 268         p->o_arg.fh = NFS_FH(dir);
 269         p->o_arg.open_flags = flags,
 270         p->o_arg.clientid = server->nfs_client->cl_clientid;
 271         p->o_arg.id = sp->so_owner_id.id;
 272         p->o_arg.name = &p->path.dentry->d_name;
 273         p->o_arg.server = server;
 274         p->o_arg.bitmask = server->attr_bitmask;
 275         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 276         if (flags & O_EXCL) {
 277                 u32 *s = (u32 *) p->o_arg.u.verifier.data;
 278                 s[0] = jiffies;
 279                 s[1] = current->pid;
 280         } else if (flags & O_CREAT) {
 281                 p->o_arg.u.attrs = &p->attrs;
 282                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 283         }
 284         p->c_arg.fh = &p->o_res.fh;
 285         p->c_arg.stateid = &p->o_res.stateid;
 286         p->c_arg.seqid = p->o_arg.seqid;
 287         nfs4_init_opendata_res(p);
 288         kref_init(&p->kref);
 289         return p;
 290 err_free:
 291         kfree(p);
 292 err:
 293         dput(parent);
 294         return NULL;
 295 }
 296
 297 static void nfs4_opendata_free(struct kref *kref)
 298 {
 299         struct nfs4_opendata *p = container_of(kref,
 300                         struct nfs4_opendata, kref);
 301
 302         nfs_free_seqid(p->o_arg.seqid);
 303         if (p->state != NULL)
 304                 nfs4_put_open_state(p->state);
 305         nfs4_put_state_owner(p->owner);
 306         dput(p->dir);
 307         dput(p->path.dentry);
 308         mntput(p->path.mnt);
 309         kfree(p);
 310 }
 311
 312 static void nfs4_opendata_put(struct nfs4_opendata *p)
 313 {
 314         if (p != NULL)
 315                 kref_put(&p->kref, nfs4_opendata_free);
 316 }
 317
 318 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 319 {
 320         sigset_t oldset;
 321         int ret;
 322
 323         rpc_clnt_sigmask(task->tk_client, &oldset);
 324         ret = rpc_wait_for_completion_task(task);
 325         rpc_clnt_sigunmask(task->tk_client, &oldset);
 326         return ret;
 327 }
 328
 329 static int can_open_cached(struct nfs4_state *state, int mode)
 330 {
 331         int ret = 0;
 332         switch (mode & (FMODE_READ|FMODE_WRITE|O_EXCL)) {
 333                 case FMODE_READ:
 334                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0;
 335                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0;
 336                         break;
 337                 case FMODE_WRITE:
 338                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0;
 339                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0;
 340                         break;
 341                 case FMODE_READ|FMODE_WRITE:
 342                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0;
 343         }
 344         return ret;
 345 }
 346
 347 static int can_open_delegated(struct nfs_delegation *delegation, mode_t open_flags)
 348 {
 349         if ((delegation->type & open_flags) != open_flags)
 350                 return 0;
 351         if (delegation->flags & NFS_DELEGATION_NEED_RECLAIM)
 352                 return 0;
 353         return 1;
 354 }
 355
 356 static void update_open_stateflags(struct nfs4_state *state, mode_t open_flags)
 357 {
 358         switch (open_flags) {
 359                 case FMODE_WRITE:
 360                         state->n_wronly++;
 361                         break;
 362                 case FMODE_READ:
 363                         state->n_rdonly++;
 364                         break;
 365                 case FMODE_READ|FMODE_WRITE:
 366                         state->n_rdwr++;
 367         }
 368         nfs4_state_set_mode_locked(state, state->state | open_flags);
 369 }
 370
 371 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
 372 {
 373         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 374                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 375         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 376         switch (open_flags) {
 377                 case FMODE_READ:
 378                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 379                         break;
 380                 case FMODE_WRITE:
 381                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 382                         break;
 383                 case FMODE_READ|FMODE_WRITE:
 384                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 385         }
 386 }
 387
 388 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
 389 {
 390         write_seqlock(&state->seqlock);
 391         nfs_set_open_stateid_locked(state, stateid, open_flags);
 392         write_sequnlock(&state->seqlock);
 393 }
 394
 395 static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *deleg_stateid, int open_flags)
 396 {
 397         open_flags &= (FMODE_READ|FMODE_WRITE);
 398         /*
 399          * Protect the call to nfs4_state_set_mode_locked and
 400          * serialise the stateid update
 401          */
 402         write_seqlock(&state->seqlock);
 403         if (deleg_stateid != NULL) {
 404                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 405                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 406         }
 407         if (open_stateid != NULL)
 408                 nfs_set_open_stateid_locked(state, open_stateid, open_flags);
 409         write_sequnlock(&state->seqlock);
 410         spin_lock(&state->owner->so_lock);
 411         update_open_stateflags(state, open_flags);
 412         spin_unlock(&state->owner->so_lock);
 413 }
 414
 415 static void nfs4_return_incompatible_delegation(struct inode *inode, mode_t open_flags)
 416 {
 417         struct nfs_delegation *delegation;
 418
 419         rcu_read_lock();
 420         delegation = rcu_dereference(NFS_I(inode)->delegation);
 421         if (delegation == NULL || (delegation->type & open_flags) == open_flags) {
 422                 rcu_read_unlock();
 423                 return;
 424         }
 425         rcu_read_unlock();
 426         nfs_inode_return_delegation(inode);
 427 }
 428
 429 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
 430 {
 431         struct nfs4_state *state = opendata->state;
 432         struct nfs_inode *nfsi = NFS_I(state->inode);
 433         struct nfs_delegation *delegation;
 434         int open_mode = opendata->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL);
 435         nfs4_stateid stateid;
 436         int ret = -EAGAIN;
 437
 438         rcu_read_lock();
 439         delegation = rcu_dereference(nfsi->delegation);
 440         for (;;) {
 441                 if (can_open_cached(state, open_mode)) {
 442                         spin_lock(&state->owner->so_lock);
 443                         if (can_open_cached(state, open_mode)) {
 444                                 update_open_stateflags(state, open_mode);
 445                                 spin_unlock(&state->owner->so_lock);
 446                                 rcu_read_unlock();
 447                                 goto out_return_state;
 448                         }
 449                         spin_unlock(&state->owner->so_lock);
 450                 }
 451                 if (delegation == NULL)
 452                         break;
 453                 if (!can_open_delegated(delegation, open_mode))
 454                         break;
 455                 /* Save the delegation */
 456                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
 457                 rcu_read_unlock();
 458                 lock_kernel();
 459                 ret = _nfs4_do_access(state->inode, state->owner->so_cred, open_mode);
 460                 unlock_kernel();
 461                 if (ret != 0)
 462                         goto out;
 463                 ret = -EAGAIN;
 464                 rcu_read_lock();
 465                 delegation = rcu_dereference(nfsi->delegation);
 466                 /* If no delegation, try a cached open */
 467                 if (delegation == NULL)
 468                         continue;
 469                 /* Is the delegation still valid? */
 470                 if (memcmp(stateid.data, delegation->stateid.data, sizeof(stateid.data)) != 0)
 471                         continue;
 472                 rcu_read_unlock();
 473                 update_open_stateid(state, NULL, &stateid, open_mode);
 474                 goto out_return_state;
 475         }
 476         rcu_read_unlock();
 477 out:
 478         return ERR_PTR(ret);
 479 out_return_state:
 480         atomic_inc(&state->count);
 481         return state;
 482 }
 483
 484 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
 485 {
 486         struct inode *inode;
 487         struct nfs4_state *state = NULL;
 488         struct nfs_delegation *delegation;
 489         nfs4_stateid *deleg_stateid = NULL;
 490         int ret;
 491
 492         if (!data->rpc_done) {
 493                 state = nfs4_try_open_cached(data);
 494                 goto out;
 495         }
 496
 497         ret = -EAGAIN;
 498         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
 499                 goto err;
 500         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
 501         ret = PTR_ERR(inode);
 502         if (IS_ERR(inode))
 503                 goto err;
 504         ret = -ENOMEM;
 505         state = nfs4_get_open_state(inode, data->owner);
 506         if (state == NULL)
 507                 goto err_put_inode;
 508         if (data->o_res.delegation_type != 0) {
 509                 int delegation_flags = 0;
 510
 511                 rcu_read_lock();
 512                 delegation = rcu_dereference(NFS_I(inode)->delegation);
 513                 if (delegation)
 514                         delegation_flags = delegation->flags;
 515                 rcu_read_unlock();
 516                 if (!(delegation_flags & NFS_DELEGATION_NEED_RECLAIM))
 517                         nfs_inode_set_delegation(state->inode,
 518                                         data->owner->so_cred,
 519                                         &data->o_res);
 520                 else
 521                         nfs_inode_reclaim_delegation(state->inode,
 522                                         data->owner->so_cred,
 523                                         &data->o_res);
 524         }
 525         rcu_read_lock();
 526         delegation = rcu_dereference(NFS_I(inode)->delegation);
 527         if (delegation != NULL)
 528                 deleg_stateid = &delegation->stateid;
 529         update_open_stateid(state, &data->o_res.stateid, deleg_stateid, data->o_arg.open_flags);
 530         rcu_read_unlock();
 531         iput(inode);
 532 out:
 533         return state;
 534 err_put_inode:
 535         iput(inode);
 536 err:
 537         return ERR_PTR(ret);
 538 }
 539
 540 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
 541 {
 542         struct nfs_inode *nfsi = NFS_I(state->inode);
 543         struct nfs_open_context *ctx;
 544
 545         spin_lock(&state->inode->i_lock);
 546         list_for_each_entry(ctx, &nfsi->open_files, list) {
 547                 if (ctx->state != state)
 548                         continue;
 549                 get_nfs_open_context(ctx);
 550                 spin_unlock(&state->inode->i_lock);
 551                 return ctx;
 552         }
 553         spin_unlock(&state->inode->i_lock);
 554         return ERR_PTR(-ENOENT);
 555 }
 556
 557 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
 558 {
 559         struct nfs4_opendata *opendata;
 560
 561         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, NULL);
 562         if (opendata == NULL)
 563                 return ERR_PTR(-ENOMEM);
 564         opendata->state = state;
 565         atomic_inc(&state->count);
 566         return opendata;
 567 }
 568
 569 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, mode_t openflags, struct nfs4_state **res)
 570 {
 571         struct nfs4_state *newstate;
 572         int ret;
 573
 574         opendata->o_arg.open_flags = openflags;
 575         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
 576         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
 577         nfs4_init_opendata_res(opendata);
 578         ret = _nfs4_proc_open(opendata);
 579         if (ret != 0)
 580                 return ret;
 581         newstate = nfs4_opendata_to_nfs4_state(opendata);
 582         if (IS_ERR(newstate))
 583                 return PTR_ERR(newstate);
 584         nfs4_close_state(&opendata->path, newstate, openflags);
 585         *res = newstate;
 586         return 0;
 587 }
 588
 589 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
 590 {
 591         struct nfs4_state *newstate;
 592         int ret;
 593
 594         /* memory barrier prior to reading state->n_* */
 595         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 596         smp_rmb();
 597         if (state->n_rdwr != 0) {
 598                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
 599                 if (ret != 0)
 600                         return ret;
 601                 if (newstate != state)
 602                         return -ESTALE;
 603         }
 604         if (state->n_wronly != 0) {
 605                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
 606                 if (ret != 0)
 607                         return ret;
 608                 if (newstate != state)
 609                         return -ESTALE;
 610         }
 611         if (state->n_rdonly != 0) {
 612                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
 613                 if (ret != 0)
 614                         return ret;
 615                 if (newstate != state)
 616                         return -ESTALE;
 617         }
 618         /*
 619          * We may have performed cached opens for all three recoveries.
 620          * Check if we need to update the current stateid.
 621          */
 622         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
 623             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
 624                 write_seqlock(&state->seqlock);
 625                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 626                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
 627                 write_sequnlock(&state->seqlock);
 628         }
 629         return 0;
 630 }
 631
 632 /*
 633  * OPEN_RECLAIM:
 634  *      reclaim state on the server after a reboot.
 635  */
 636 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
 637 {
 638         struct nfs_delegation *delegation;
 639         struct nfs4_opendata *opendata;
 640         int delegation_type = 0;
 641         int status;
 642
 643         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 644         if (IS_ERR(opendata))
 645                 return PTR_ERR(opendata);
 646         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
 647         opendata->o_arg.fh = NFS_FH(state->inode);
 648         rcu_read_lock();
 649         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
 650         if (delegation != NULL && (delegation->flags & NFS_DELEGATION_NEED_RECLAIM) != 0)
 651                 delegation_type = delegation->flags;
 652         rcu_read_unlock();
 653         opendata->o_arg.u.delegation_type = delegation_type;
 654         status = nfs4_open_recover(opendata, state);
 655         nfs4_opendata_put(opendata);
 656         return status;
 657 }
 658
 659 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
 660 {
 661         struct nfs_server *server = NFS_SERVER(state->inode);
 662         struct nfs4_exception exception = { };
 663         int err;
 664         do {
 665                 err = _nfs4_do_open_reclaim(ctx, state);
 666                 if (err != -NFS4ERR_DELAY)
 667                         break;
 668                 nfs4_handle_exception(server, err, &exception);
 669         } while (exception.retry);
 670         return err;
 671 }
 672
 673 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
 674 {
 675         struct nfs_open_context *ctx;
 676         int ret;
 677
 678         ctx = nfs4_state_find_open_context(state);
 679         if (IS_ERR(ctx))
 680                 return PTR_ERR(ctx);
 681         ret = nfs4_do_open_reclaim(ctx, state);
 682         put_nfs_open_context(ctx);
 683         return ret;
 684 }
 685
 686 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
 687 {
 688         struct nfs4_opendata *opendata;
 689         int ret;
 690
 691         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 692         if (IS_ERR(opendata))
 693                 return PTR_ERR(opendata);
 694         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
 695         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
 696                         sizeof(opendata->o_arg.u.delegation.data));
 697         ret = nfs4_open_recover(opendata, state);
 698         nfs4_opendata_put(opendata);
 699         return ret;
 700 }
 701
 702 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
 703 {
 704         struct nfs4_exception exception = { };
 705         struct nfs_server *server = NFS_SERVER(state->inode);
 706         int err;
 707         do {
 708                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
 709                 switch (err) {
 710                         case 0:
 711                                 return err;
 712                         case -NFS4ERR_STALE_CLIENTID:
 713                         case -NFS4ERR_STALE_STATEID:
 714                         case -NFS4ERR_EXPIRED:
 715                                 /* Don't recall a delegation if it was lost */
 716                                 nfs4_schedule_state_recovery(server->nfs_client);
 717                                 return err;
 718                 }
 719                 err = nfs4_handle_exception(server, err, &exception);
 720         } while (exception.retry);
 721         return err;
 722 }
 723
 724 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
 725 {
 726         struct nfs4_opendata *data = calldata;
 727         struct  rpc_message msg = {
 728                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
 729                 .rpc_argp = &data->c_arg,
 730                 .rpc_resp = &data->c_res,
 731                 .rpc_cred = data->owner->so_cred,
 732         };
 733         data->timestamp = jiffies;
 734         rpc_call_setup(task, &msg, 0);
 735 }
 736
 737 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
 738 {
 739         struct nfs4_opendata *data = calldata;
 740
 741         data->rpc_status = task->tk_status;
 742         if (RPC_ASSASSINATED(task))
 743                 return;
 744         if (data->rpc_status == 0) {
 745                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
 746                                 sizeof(data->o_res.stateid.data));
 747                 renew_lease(data->o_res.server, data->timestamp);
 748                 data->rpc_done = 1;
 749         }
 750         nfs_confirm_seqid(&data->owner->so_seqid, data->rpc_status);
 751         nfs_increment_open_seqid(data->rpc_status, data->c_arg.seqid);
 752 }
 753
 754 static void nfs4_open_confirm_release(void *calldata)
 755 {
 756         struct nfs4_opendata *data = calldata;
 757         struct nfs4_state *state = NULL;
 758
 759         /* If this request hasn't been cancelled, do nothing */
 760         if (data->cancelled == 0)
 761                 goto out_free;
 762         /* In case of error, no cleanup! */
 763         if (!data->rpc_done)
 764                 goto out_free;
 765         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 766         state = nfs4_opendata_to_nfs4_state(data);
 767         if (!IS_ERR(state))
 768                 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
 769 out_free:
 770         nfs4_opendata_put(data);
 771 }
 772
 773 static const struct rpc_call_ops nfs4_open_confirm_ops = {
 774         .rpc_call_prepare = nfs4_open_confirm_prepare,
 775         .rpc_call_done = nfs4_open_confirm_done,
 776         .rpc_release = nfs4_open_confirm_release,
 777 };
 778
 779 /*
 780  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
 781  */
 782 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
 783 {
 784         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
 785         struct rpc_task *task;
 786         int status;
 787
 788         kref_get(&data->kref);
 789         data->rpc_done = 0;
 790         data->rpc_status = 0;
 791         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_confirm_ops, data);
 792         if (IS_ERR(task))
 793                 return PTR_ERR(task);
 794         status = nfs4_wait_for_completion_rpc_task(task);
 795         if (status != 0) {
 796                 data->cancelled = 1;
 797                 smp_wmb();
 798         } else
 799                 status = data->rpc_status;
 800         rpc_put_task(task);
 801         return status;
 802 }
 803
 804 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
 805 {
 806         struct nfs4_opendata *data = calldata;
 807         struct nfs4_state_owner *sp = data->owner;
 808         struct rpc_message msg = {
 809                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
 810                 .rpc_argp = &data->o_arg,
 811                 .rpc_resp = &data->o_res,
 812                 .rpc_cred = sp->so_cred,
 813         };
 814
 815         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
 816                 return;
 817         /*
 818          * Check if we still need to send an OPEN call, or if we can use
 819          * a delegation instead.
 820          */
 821         if (data->state != NULL) {
 822                 struct nfs_delegation *delegation;
 823
 824                 if (can_open_cached(data->state, data->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL)))
 825                         goto out_no_action;
 826                 rcu_read_lock();
 827                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
 828                 if (delegation != NULL &&
 829                    (delegation->flags & NFS_DELEGATION_NEED_RECLAIM) == 0) {
 830                         rcu_read_unlock();
 831                         goto out_no_action;
 832                 }
 833                 rcu_read_unlock();
 834         }
 835         /* Update sequence id. */
 836         data->o_arg.id = sp->so_owner_id.id;
 837         data->o_arg.clientid = sp->so_client->cl_clientid;
 838         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
 839                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
 840                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
 841         }
 842         data->timestamp = jiffies;
 843         rpc_call_setup(task, &msg, 0);
 844         return;
 845 out_no_action:
 846         task->tk_action = NULL;
 847
 848 }
 849
 850 static void nfs4_open_done(struct rpc_task *task, void *calldata)
 851 {
 852         struct nfs4_opendata *data = calldata;
 853
 854         data->rpc_status = task->tk_status;
 855         if (RPC_ASSASSINATED(task))
 856                 return;
 857         if (task->tk_status == 0) {
 858                 switch (data->o_res.f_attr->mode & S_IFMT) {
 859                         case S_IFREG:
 860                                 break;
 861                         case S_IFLNK:
 862                                 data->rpc_status = -ELOOP;
 863                                 break;
 864                         case S_IFDIR:
 865                                 data->rpc_status = -EISDIR;
 866                                 break;
 867                         default:
 868                                 data->rpc_status = -ENOTDIR;
 869                 }
 870                 renew_lease(data->o_res.server, data->timestamp);
 871                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
 872                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 873         }
 874         nfs_increment_open_seqid(data->rpc_status, data->o_arg.seqid);
 875         data->rpc_done = 1;
 876 }
 877
 878 static void nfs4_open_release(void *calldata)
 879 {
 880         struct nfs4_opendata *data = calldata;
 881         struct nfs4_state *state = NULL;
 882
 883         /* If this request hasn't been cancelled, do nothing */
 884         if (data->cancelled == 0)
 885                 goto out_free;
 886         /* In case of error, no cleanup! */
 887         if (data->rpc_status != 0 || !data->rpc_done)
 888                 goto out_free;
 889         /* In case we need an open_confirm, no cleanup! */
 890         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
 891                 goto out_free;
 892         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 893         state = nfs4_opendata_to_nfs4_state(data);
 894         if (!IS_ERR(state))
 895                 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
 896 out_free:
 897         nfs4_opendata_put(data);
 898 }
 899
 900 static const struct rpc_call_ops nfs4_open_ops = {
 901         .rpc_call_prepare = nfs4_open_prepare,
 902         .rpc_call_done = nfs4_open_done,
 903         .rpc_release = nfs4_open_release,
 904 };
 905
 906 /*
 907  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
 908  */
 909 static int _nfs4_proc_open(struct nfs4_opendata *data)
 910 {
 911         struct inode *dir = data->dir->d_inode;
 912         struct nfs_server *server = NFS_SERVER(dir);
 913         struct nfs_openargs *o_arg = &data->o_arg;
 914         struct nfs_openres *o_res = &data->o_res;
 915         struct rpc_task *task;
 916         int status;
 917
 918         kref_get(&data->kref);
 919         data->rpc_done = 0;
 920         data->rpc_status = 0;
 921         data->cancelled = 0;
 922         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_ops, data);
 923         if (IS_ERR(task))
 924                 return PTR_ERR(task);
 925         status = nfs4_wait_for_completion_rpc_task(task);
 926         if (status != 0) {
 927                 data->cancelled = 1;
 928                 smp_wmb();
 929         } else
 930                 status = data->rpc_status;
 931         rpc_put_task(task);
 932         if (status != 0 || !data->rpc_done)
 933                 return status;
 934
 935         if (o_res->fh.size == 0)
 936                 _nfs4_proc_lookup(dir, o_arg->name, &o_res->fh, o_res->f_attr);
 937
 938         if (o_arg->open_flags & O_CREAT) {
 939                 update_changeattr(dir, &o_res->cinfo);
 940                 nfs_post_op_update_inode(dir, o_res->dir_attr);
 941         } else
 942                 nfs_refresh_inode(dir, o_res->dir_attr);
 943         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
 944                 status = _nfs4_proc_open_confirm(data);
 945                 if (status != 0)
 946                         return status;
 947         }
 948         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
 949                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
 950         return 0;
 951 }
 952
 953 static int _nfs4_do_access(struct inode *inode, struct rpc_cred *cred, int openflags)
 954 {
 955         struct nfs_access_entry cache;
 956         int mask = 0;
 957         int status;
 958
 959         if (openflags & FMODE_READ)
 960                 mask |= MAY_READ;
 961         if (openflags & FMODE_WRITE)
 962                 mask |= MAY_WRITE;
 963         if (openflags & FMODE_EXEC)
 964                 mask |= MAY_EXEC;
 965         status = nfs_access_get_cached(inode, cred, &cache);
 966         if (status == 0)
 967                 goto out;
 968
 969         /* Be clever: ask server to check for all possible rights */
 970         cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ;
 971         cache.cred = cred;
 972         cache.jiffies = jiffies;
 973         status = _nfs4_proc_access(inode, &cache);
 974         if (status != 0)
 975                 return status;
 976         nfs_access_add_cache(inode, &cache);
 977 out:
 978         if ((cache.mask & mask) == mask)
 979                 return 0;
 980         return -EACCES;
 981 }
 982
 983 static int nfs4_recover_expired_lease(struct nfs_server *server)
 984 {
 985         struct nfs_client *clp = server->nfs_client;
 986         int ret;
 987
 988         for (;;) {
 989                 ret = nfs4_wait_clnt_recover(server->client, clp);
 990                 if (ret != 0)
 991                         return ret;
 992                 if (!test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
 993                         break;
 994                 nfs4_schedule_state_recovery(clp);
 995         }
 996         return 0;
 997 }
 998
 999 /*
1000  * OPEN_EXPIRED:
1001  *      reclaim state on the server after a network partition.
1002  *      Assumes caller holds the appropriate lock
1003  */
1004 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1005 {
1006         struct nfs4_opendata *opendata;
1007         int ret;
1008
1009         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1010         if (IS_ERR(opendata))
1011                 return PTR_ERR(opendata);
1012         ret = nfs4_open_recover(opendata, state);
1013         if (ret == -ESTALE) {
1014                 /* Invalidate the state owner so we don't ever use it again */
1015                 nfs4_drop_state_owner(state->owner);
1016                 d_drop(ctx->path.dentry);
1017         }
1018         nfs4_opendata_put(opendata);
1019         return ret;
1020 }
1021
1022 static inline int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1023 {
1024         struct nfs_server *server = NFS_SERVER(state->inode);
1025         struct nfs4_exception exception = { };
1026         int err;
1027
1028         do {
1029                 err = _nfs4_open_expired(ctx, state);
1030                 if (err == -NFS4ERR_DELAY)
1031                         nfs4_handle_exception(server, err, &exception);
1032         } while (exception.retry);
1033         return err;
1034 }
1035
1036 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1037 {
1038         struct nfs_open_context *ctx;
1039         int ret;
1040
1041         ctx = nfs4_state_find_open_context(state);
1042         if (IS_ERR(ctx))
1043                 return PTR_ERR(ctx);
1044         ret = nfs4_do_open_expired(ctx, state);
1045         put_nfs_open_context(ctx);
1046         return ret;
1047 }
1048
1049 /*
1050  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1051  * fields corresponding to attributes that were used to store the verifier.
1052  * Make sure we clobber those fields in the later setattr call
1053  */
1054 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1055 {
1056         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1057             !(sattr->ia_valid & ATTR_ATIME_SET))
1058                 sattr->ia_valid |= ATTR_ATIME;
1059
1060         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1061             !(sattr->ia_valid & ATTR_MTIME_SET))
1062                 sattr->ia_valid |= ATTR_MTIME;
1063 }
1064
1065 /*
1066  * Returns a referenced nfs4_state
1067  */
1068 static int _nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
1069 {
1070         struct nfs4_state_owner  *sp;
1071         struct nfs4_state     *state = NULL;
1072         struct nfs_server       *server = NFS_SERVER(dir);
1073         struct nfs_client *clp = server->nfs_client;
1074         struct nfs4_opendata *opendata;
1075         int status;
1076
1077         /* Protect against reboot recovery conflicts */
1078         status = -ENOMEM;
1079         if (!(sp = nfs4_get_state_owner(server, cred))) {
1080                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1081                 goto out_err;
1082         }
1083         status = nfs4_recover_expired_lease(server);
1084         if (status != 0)
1085                 goto err_put_state_owner;
1086         if (path->dentry->d_inode != NULL)
1087                 nfs4_return_incompatible_delegation(path->dentry->d_inode, flags & (FMODE_READ|FMODE_WRITE));
1088         down_read(&clp->cl_sem);
1089         status = -ENOMEM;
1090         opendata = nfs4_opendata_alloc(path, sp, flags, sattr);
1091         if (opendata == NULL)
1092                 goto err_release_rwsem;
1093
1094         if (path->dentry->d_inode != NULL)
1095                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1096
1097         status = _nfs4_proc_open(opendata);
1098         if (status != 0)
1099                 goto err_opendata_put;
1100
1101         if (opendata->o_arg.open_flags & O_EXCL)
1102                 nfs4_exclusive_attrset(opendata, sattr);
1103
1104         state = nfs4_opendata_to_nfs4_state(opendata);
1105         status = PTR_ERR(state);
1106         if (IS_ERR(state))
1107                 goto err_opendata_put;
1108         nfs4_opendata_put(opendata);
1109         nfs4_put_state_owner(sp);
1110         up_read(&clp->cl_sem);
1111         *res = state;
1112         return 0;
1113 err_opendata_put:
1114         nfs4_opendata_put(opendata);
1115 err_release_rwsem:
1116         up_read(&clp->cl_sem);
1117 err_put_state_owner:
1118         nfs4_put_state_owner(sp);
1119 out_err:
1120         *res = NULL;
1121         return status;
1122 }
1123
1124
1125 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred)
1126 {
1127         struct nfs4_exception exception = { };
1128         struct nfs4_state *res;
1129         int status;
1130
1131         do {
1132                 status = _nfs4_do_open(dir, path, flags, sattr, cred, &res);
1133                 if (status == 0)
1134                         break;
1135                 /* NOTE: BAD_SEQID means the server and client disagree about the
1136                  * book-keeping w.r.t. state-changing operations
1137                  * (OPEN/CLOSE/LOCK/LOCKU...)
1138                  * It is actually a sign of a bug on the client or on the server.
1139                  *
1140                  * If we receive a BAD_SEQID error in the particular case of
1141                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1142                  * have unhashed the old state_owner for us, and that we can
1143                  * therefore safely retry using a new one. We should still warn
1144                  * the user though...
1145                  */
1146                 if (status == -NFS4ERR_BAD_SEQID) {
1147                         printk(KERN_WARNING "NFS: v4 server %s "
1148                                         " returned a bad sequence-id error!\n",
1149                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1150                         exception.retry = 1;
1151                         continue;
1152                 }
1153                 /*
1154                  * BAD_STATEID on OPEN means that the server cancelled our
1155                  * state before it received the OPEN_CONFIRM.
1156                  * Recover by retrying the request as per the discussion
1157                  * on Page 181 of RFC3530.
1158                  */
1159                 if (status == -NFS4ERR_BAD_STATEID) {
1160                         exception.retry = 1;
1161                         continue;
1162                 }
1163                 if (status == -EAGAIN) {
1164                         /* We must have found a delegation */
1165                         exception.retry = 1;
1166                         continue;
1167                 }
1168                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1169                                         status, &exception));
1170         } while (exception.retry);
1171         return res;
1172 }
1173
1174 static int _nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1175                 struct iattr *sattr, struct nfs4_state *state)
1176 {
1177         struct nfs_server *server = NFS_SERVER(inode);
1178         struct nfs_setattrargs  arg = {
1179                 .fh             = NFS_FH(inode),
1180                 .iap            = sattr,
1181                 .server         = server,
1182                 .bitmask = server->attr_bitmask,
1183         };
1184         struct nfs_setattrres  res = {
1185                 .fattr          = fattr,
1186                 .server         = server,
1187         };
1188         struct rpc_message msg = {
1189                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1190                 .rpc_argp       = &arg,
1191                 .rpc_resp       = &res,
1192         };
1193         unsigned long timestamp = jiffies;
1194         int status;
1195
1196         nfs_fattr_init(fattr);
1197
1198         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1199                 /* Use that stateid */
1200         } else if (state != NULL) {
1201                 msg.rpc_cred = state->owner->so_cred;
1202                 nfs4_copy_stateid(&arg.stateid, state, current->files);
1203         } else
1204                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1205
1206         status = rpc_call_sync(server->client, &msg, 0);
1207         if (status == 0 && state != NULL)
1208                 renew_lease(server, timestamp);
1209         return status;
1210 }
1211
1212 static int nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1213                 struct iattr *sattr, struct nfs4_state *state)
1214 {
1215         struct nfs_server *server = NFS_SERVER(inode);
1216         struct nfs4_exception exception = { };
1217         int err;
1218         do {
1219                 err = nfs4_handle_exception(server,
1220                                 _nfs4_do_setattr(inode, fattr, sattr, state),
1221                                 &exception);
1222         } while (exception.retry);
1223         return err;
1224 }
1225
1226 struct nfs4_closedata {
1227         struct path path;
1228         struct inode *inode;
1229         struct nfs4_state *state;
1230         struct nfs_closeargs arg;
1231         struct nfs_closeres res;
1232         struct nfs_fattr fattr;
1233         unsigned long timestamp;
1234 };
1235
1236 static void nfs4_free_closedata(void *data)
1237 {
1238         struct nfs4_closedata *calldata = data;
1239         struct nfs4_state_owner *sp = calldata->state->owner;
1240
1241         nfs4_put_open_state(calldata->state);
1242         nfs_free_seqid(calldata->arg.seqid);
1243         nfs4_put_state_owner(sp);
1244         dput(calldata->path.dentry);
1245         mntput(calldata->path.mnt);
1246         kfree(calldata);
1247 }
1248
1249 static void nfs4_close_done(struct rpc_task *task, void *data)
1250 {
1251         struct nfs4_closedata *calldata = data;
1252         struct nfs4_state *state = calldata->state;
1253         struct nfs_server *server = NFS_SERVER(calldata->inode);
1254
1255         if (RPC_ASSASSINATED(task))
1256                 return;
1257         /* hmm. we are done with the inode, and in the process of freeing
1258          * the state_owner. we keep this around to process errors
1259          */
1260         nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid);
1261         switch (task->tk_status) {
1262                 case 0:
1263                         nfs_set_open_stateid(state, &calldata->res.stateid, calldata->arg.open_flags);
1264                         renew_lease(server, calldata->timestamp);
1265                         break;
1266                 case -NFS4ERR_STALE_STATEID:
1267                 case -NFS4ERR_EXPIRED:
1268                         break;
1269                 default:
1270                         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1271                                 rpc_restart_call(task);
1272                                 return;
1273                         }
1274         }
1275         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1276 }
1277
1278 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1279 {
1280         struct nfs4_closedata *calldata = data;
1281         struct nfs4_state *state = calldata->state;
1282         struct rpc_message msg = {
1283                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1284                 .rpc_argp = &calldata->arg,
1285                 .rpc_resp = &calldata->res,
1286                 .rpc_cred = state->owner->so_cred,
1287         };
1288         int clear_rd, clear_wr, clear_rdwr;
1289         int mode;
1290
1291         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1292                 return;
1293
1294         mode = FMODE_READ|FMODE_WRITE;
1295         clear_rd = clear_wr = clear_rdwr = 0;
1296         spin_lock(&state->owner->so_lock);
1297         /* Calculate the change in open mode */
1298         if (state->n_rdwr == 0) {
1299                 if (state->n_rdonly == 0) {
1300                         mode &= ~FMODE_READ;
1301                         clear_rd |= test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1302                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1303                 }
1304                 if (state->n_wronly == 0) {
1305                         mode &= ~FMODE_WRITE;
1306                         clear_wr |= test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1307                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1308                 }
1309         }
1310         spin_unlock(&state->owner->so_lock);
1311         if (!clear_rd && !clear_wr && !clear_rdwr) {
1312                 /* Note: exit _without_ calling nfs4_close_done */
1313                 task->tk_action = NULL;
1314                 return;
1315         }
1316         nfs_fattr_init(calldata->res.fattr);
1317         if (mode != 0)
1318                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1319         calldata->arg.open_flags = mode;
1320         calldata->timestamp = jiffies;
1321         rpc_call_setup(task, &msg, 0);
1322 }
1323
1324 static const struct rpc_call_ops nfs4_close_ops = {
1325         .rpc_call_prepare = nfs4_close_prepare,
1326         .rpc_call_done = nfs4_close_done,
1327         .rpc_release = nfs4_free_closedata,
1328 };
1329
1330 /*
1331  * It is possible for data to be read/written from a mem-mapped file
1332  * after the sys_close call (which hits the vfs layer as a flush).
1333  * This means that we can't safely call nfsv4 close on a file until
1334  * the inode is cleared. This in turn means that we are not good
1335  * NFSv4 citizens - we do not indicate to the server to update the file's
1336  * share state even when we are done with one of the three share
1337  * stateid's in the inode.
1338  *
1339  * NOTE: Caller must be holding the sp->so_owner semaphore!
1340  */
1341 int nfs4_do_close(struct path *path, struct nfs4_state *state)
1342 {
1343         struct nfs_server *server = NFS_SERVER(state->inode);
1344         struct nfs4_closedata *calldata;
1345         struct nfs4_state_owner *sp = state->owner;
1346         struct rpc_task *task;
1347         int status = -ENOMEM;
1348
1349         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1350         if (calldata == NULL)
1351                 goto out;
1352         calldata->inode = state->inode;
1353         calldata->state = state;
1354         calldata->arg.fh = NFS_FH(state->inode);
1355         calldata->arg.stateid = &state->open_stateid;
1356         /* Serialization for the sequence id */
1357         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1358         if (calldata->arg.seqid == NULL)
1359                 goto out_free_calldata;
1360         calldata->arg.bitmask = server->attr_bitmask;
1361         calldata->res.fattr = &calldata->fattr;
1362         calldata->res.server = server;
1363         calldata->path.mnt = mntget(path->mnt);
1364         calldata->path.dentry = dget(path->dentry);
1365
1366         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_close_ops, calldata);
1367         if (IS_ERR(task))
1368                 return PTR_ERR(task);
1369         rpc_put_task(task);
1370         return 0;
1371 out_free_calldata:
1372         kfree(calldata);
1373 out:
1374         nfs4_put_open_state(state);
1375         nfs4_put_state_owner(sp);
1376         return status;
1377 }
1378
1379 static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state)
1380 {
1381         struct file *filp;
1382         int ret;
1383
1384         /* If the open_intent is for execute, we have an extra check to make */
1385         if (nd->intent.open.flags & FMODE_EXEC) {
1386                 ret = _nfs4_do_access(state->inode,
1387                                 state->owner->so_cred,
1388                                 nd->intent.open.flags);
1389                 if (ret < 0)
1390                         goto out_close;
1391         }
1392         filp = lookup_instantiate_filp(nd, path->dentry, NULL);
1393         if (!IS_ERR(filp)) {
1394                 struct nfs_open_context *ctx;
1395                 ctx = (struct nfs_open_context *)filp->private_data;
1396                 ctx->state = state;
1397                 return 0;
1398         }
1399         ret = PTR_ERR(filp);
1400 out_close:
1401         nfs4_close_state(path, state, nd->intent.open.flags);
1402         return ret;
1403 }
1404
1405 struct dentry *
1406 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1407 {
1408         struct path path = {
1409                 .mnt = nd->mnt,
1410                 .dentry = dentry,
1411         };
1412         struct iattr attr;
1413         struct rpc_cred *cred;
1414         struct nfs4_state *state;
1415         struct dentry *res;
1416
1417         if (nd->flags & LOOKUP_CREATE) {
1418                 attr.ia_mode = nd->intent.open.create_mode;
1419                 attr.ia_valid = ATTR_MODE;
1420                 if (!IS_POSIXACL(dir))
1421                         attr.ia_mode &= ~current->fs->umask;
1422         } else {
1423                 attr.ia_valid = 0;
1424                 BUG_ON(nd->intent.open.flags & O_CREAT);
1425         }
1426
1427         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1428         if (IS_ERR(cred))
1429                 return (struct dentry *)cred;
1430         state = nfs4_do_open(dir, &path, nd->intent.open.flags, &attr, cred);
1431         put_rpccred(cred);
1432         if (IS_ERR(state)) {
1433                 if (PTR_ERR(state) == -ENOENT)
1434                         d_add(dentry, NULL);
1435                 return (struct dentry *)state;
1436         }
1437         res = d_add_unique(dentry, igrab(state->inode));
1438         if (res != NULL)
1439                 dentry = res;
1440         nfs4_intent_set_file(nd, &path, state);
1441         return res;
1442 }
1443
1444 int
1445 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1446 {
1447         struct path path = {
1448                 .mnt = nd->mnt,
1449                 .dentry = dentry,
1450         };
1451         struct rpc_cred *cred;
1452         struct nfs4_state *state;
1453
1454         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1455         if (IS_ERR(cred))
1456                 return PTR_ERR(cred);
1457         state = nfs4_do_open(dir, &path, openflags, NULL, cred);
1458         put_rpccred(cred);
1459         if (IS_ERR(state)) {
1460                 switch (PTR_ERR(state)) {
1461                         case -EPERM:
1462                         case -EACCES:
1463                         case -EDQUOT:
1464                         case -ENOSPC:
1465                         case -EROFS:
1466                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1467                                 return 1;
1468                         default:
1469                                 goto out_drop;
1470                 }
1471         }
1472         if (state->inode == dentry->d_inode) {
1473                 nfs4_intent_set_file(nd, &path, state);
1474                 return 1;
1475         }
1476         nfs4_close_state(&path, state, openflags);
1477 out_drop:
1478         d_drop(dentry);
1479         return 0;
1480 }
1481
1482
1483 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1484 {
1485         struct nfs4_server_caps_res res = {};
1486         struct rpc_message msg = {
1487                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1488                 .rpc_argp = fhandle,
1489                 .rpc_resp = &res,
1490         };
1491         int status;
1492
1493         status = rpc_call_sync(server->client, &msg, 0);
1494         if (status == 0) {
1495                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1496                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1497                         server->caps |= NFS_CAP_ACLS;
1498                 if (res.has_links != 0)
1499                         server->caps |= NFS_CAP_HARDLINKS;
1500                 if (res.has_symlinks != 0)
1501                         server->caps |= NFS_CAP_SYMLINKS;
1502                 server->acl_bitmask = res.acl_bitmask;
1503         }
1504         return status;
1505 }
1506
1507 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1508 {
1509         struct nfs4_exception exception = { };
1510         int err;
1511         do {
1512                 err = nfs4_handle_exception(server,
1513                                 _nfs4_server_capabilities(server, fhandle),
1514                                 &exception);
1515         } while (exception.retry);
1516         return err;
1517 }
1518
1519 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1520                 struct nfs_fsinfo *info)
1521 {
1522         struct nfs4_lookup_root_arg args = {
1523                 .bitmask = nfs4_fattr_bitmap,
1524         };
1525         struct nfs4_lookup_res res = {
1526                 .server = server,
1527                 .fattr = info->fattr,
1528                 .fh = fhandle,
1529         };
1530         struct rpc_message msg = {
1531                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1532                 .rpc_argp = &args,
1533                 .rpc_resp = &res,
1534         };
1535         nfs_fattr_init(info->fattr);
1536         return rpc_call_sync(server->client, &msg, 0);
1537 }
1538
1539 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1540                 struct nfs_fsinfo *info)
1541 {
1542         struct nfs4_exception exception = { };
1543         int err;
1544         do {
1545                 err = nfs4_handle_exception(server,
1546                                 _nfs4_lookup_root(server, fhandle, info),
1547                                 &exception);
1548         } while (exception.retry);
1549         return err;
1550 }
1551
1552 /*
1553  * get the file handle for the "/" directory on the server
1554  */
1555 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1556                               struct nfs_fsinfo *info)
1557 {
1558         int status;
1559
1560         status = nfs4_lookup_root(server, fhandle, info);
1561         if (status == 0)
1562                 status = nfs4_server_capabilities(server, fhandle);
1563         if (status == 0)
1564                 status = nfs4_do_fsinfo(server, fhandle, info);
1565         return nfs4_map_errors(status);
1566 }
1567
1568 /*
1569  * Get locations and (maybe) other attributes of a referral.
1570  * Note that we'll actually follow the referral later when
1571  * we detect fsid mismatch in inode revalidation
1572  */
1573 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
1574 {
1575         int status = -ENOMEM;
1576         struct page *page = NULL;
1577         struct nfs4_fs_locations *locations = NULL;
1578
1579         page = alloc_page(GFP_KERNEL);
1580         if (page == NULL)
1581                 goto out;
1582         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1583         if (locations == NULL)
1584                 goto out;
1585
1586         status = nfs4_proc_fs_locations(dir, name, locations, page);
1587         if (status != 0)
1588                 goto out;
1589         /* Make sure server returned a different fsid for the referral */
1590         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
1591                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __FUNCTION__, name->name);
1592                 status = -EIO;
1593                 goto out;
1594         }
1595
1596         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
1597         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
1598         if (!fattr->mode)
1599                 fattr->mode = S_IFDIR;
1600         memset(fhandle, 0, sizeof(struct nfs_fh));
1601 out:
1602         if (page)
1603                 __free_page(page);
1604         if (locations)
1605                 kfree(locations);
1606         return status;
1607 }
1608
1609 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1610 {
1611         struct nfs4_getattr_arg args = {
1612                 .fh = fhandle,
1613                 .bitmask = server->attr_bitmask,
1614         };
1615         struct nfs4_getattr_res res = {
1616                 .fattr = fattr,
1617                 .server = server,
1618         };
1619         struct rpc_message msg = {
1620                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1621                 .rpc_argp = &args,
1622                 .rpc_resp = &res,
1623         };
1624
1625         nfs_fattr_init(fattr);
1626         return rpc_call_sync(server->client, &msg, 0);
1627 }
1628
1629 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1630 {
1631         struct nfs4_exception exception = { };
1632         int err;
1633         do {
1634                 err = nfs4_handle_exception(server,
1635                                 _nfs4_proc_getattr(server, fhandle, fattr),
1636                                 &exception);
1637         } while (exception.retry);
1638         return err;
1639 }
1640
1641 /*
1642  * The file is not closed if it is opened due to the a request to change
1643  * the size of the file. The open call will not be needed once the
1644  * VFS layer lookup-intents are implemented.
1645  *
1646  * Close is called when the inode is destroyed.
1647  * If we haven't opened the file for O_WRONLY, we
1648  * need to in the size_change case to obtain a stateid.
1649  *
1650  * Got race?
1651  * Because OPEN is always done by name in nfsv4, it is
1652  * possible that we opened a different file by the same
1653  * name.  We can recognize this race condition, but we
1654  * can't do anything about it besides returning an error.
1655  *
1656  * This will be fixed with VFS changes (lookup-intent).
1657  */
1658 static int
1659 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1660                   struct iattr *sattr)
1661 {
1662         struct rpc_cred *cred;
1663         struct inode *inode = dentry->d_inode;
1664         struct nfs_open_context *ctx;
1665         struct nfs4_state *state = NULL;
1666         int status;
1667
1668         nfs_fattr_init(fattr);
1669
1670         cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
1671         if (IS_ERR(cred))
1672                 return PTR_ERR(cred);
1673
1674         /* Search for an existing open(O_WRITE) file */
1675         ctx = nfs_find_open_context(inode, cred, FMODE_WRITE);
1676         if (ctx != NULL)
1677                 state = ctx->state;
1678
1679         status = nfs4_do_setattr(inode, fattr, sattr, state);
1680         if (status == 0)
1681                 nfs_setattr_update_inode(inode, sattr);
1682         if (ctx != NULL)
1683                 put_nfs_open_context(ctx);
1684         put_rpccred(cred);
1685         return status;
1686 }
1687
1688 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
1689                 const struct qstr *name, struct nfs_fh *fhandle,
1690                 struct nfs_fattr *fattr)
1691 {
1692         int                    status;
1693         struct nfs4_lookup_arg args = {
1694                 .bitmask = server->attr_bitmask,
1695                 .dir_fh = dirfh,
1696                 .name = name,
1697         };
1698         struct nfs4_lookup_res res = {
1699                 .server = server,
1700                 .fattr = fattr,
1701                 .fh = fhandle,
1702         };
1703         struct rpc_message msg = {
1704                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1705                 .rpc_argp = &args,
1706                 .rpc_resp = &res,
1707         };
1708
1709         nfs_fattr_init(fattr);
1710
1711         dprintk("NFS call  lookupfh %s\n", name->name);
1712         status = rpc_call_sync(server->client, &msg, 0);
1713         dprintk("NFS reply lookupfh: %d\n", status);
1714         return status;
1715 }
1716
1717 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1718                               struct qstr *name, struct nfs_fh *fhandle,
1719                               struct nfs_fattr *fattr)
1720 {
1721         struct nfs4_exception exception = { };
1722         int err;
1723         do {
1724                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
1725                 /* FIXME: !!!! */
1726                 if (err == -NFS4ERR_MOVED) {
1727                         err = -EREMOTE;
1728                         break;
1729                 }
1730                 err = nfs4_handle_exception(server, err, &exception);
1731         } while (exception.retry);
1732         return err;
1733 }
1734
1735 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
1736                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1737 {
1738         int status;
1739
1740         dprintk("NFS call  lookup %s\n", name->name);
1741         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
1742         if (status == -NFS4ERR_MOVED)
1743                 status = nfs4_get_referral(dir, name, fattr, fhandle);
1744         dprintk("NFS reply lookup: %d\n", status);
1745         return status;
1746 }
1747
1748 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1749 {
1750         struct nfs4_exception exception = { };
1751         int err;
1752         do {
1753                 err = nfs4_handle_exception(NFS_SERVER(dir),
1754                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1755                                 &exception);
1756         } while (exception.retry);
1757         return err;
1758 }
1759
1760 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1761 {
1762         struct nfs4_accessargs args = {
1763                 .fh = NFS_FH(inode),
1764         };
1765         struct nfs4_accessres res = { 0 };
1766         struct rpc_message msg = {
1767                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1768                 .rpc_argp = &args,
1769                 .rpc_resp = &res,
1770                 .rpc_cred = entry->cred,
1771         };
1772         int mode = entry->mask;
1773         int status;
1774
1775         /*
1776          * Determine which access bits we want to ask for...
1777          */
1778         if (mode & MAY_READ)
1779                 args.access |= NFS4_ACCESS_READ;
1780         if (S_ISDIR(inode->i_mode)) {
1781                 if (mode & MAY_WRITE)
1782                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1783                 if (mode & MAY_EXEC)
1784                         args.access |= NFS4_ACCESS_LOOKUP;
1785         } else {
1786                 if (mode & MAY_WRITE)
1787                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1788                 if (mode & MAY_EXEC)
1789                         args.access |= NFS4_ACCESS_EXECUTE;
1790         }
1791         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1792         if (!status) {
1793                 entry->mask = 0;
1794                 if (res.access & NFS4_ACCESS_READ)
1795                         entry->mask |= MAY_READ;
1796                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1797                         entry->mask |= MAY_WRITE;
1798                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1799                         entry->mask |= MAY_EXEC;
1800         }
1801         return status;
1802 }
1803
1804 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1805 {
1806         struct nfs4_exception exception = { };
1807         int err;
1808         do {
1809                 err = nfs4_handle_exception(NFS_SERVER(inode),
1810                                 _nfs4_proc_access(inode, entry),
1811                                 &exception);
1812         } while (exception.retry);
1813         return err;
1814 }
1815
1816 /*
1817  * TODO: For the time being, we don't try to get any attributes
1818  * along with any of the zero-copy operations READ, READDIR,
1819  * READLINK, WRITE.
1820  *
1821  * In the case of the first three, we want to put the GETATTR
1822  * after the read-type operation -- this is because it is hard
1823  * to predict the length of a GETATTR response in v4, and thus
1824  * align the READ data correctly.  This means that the GETATTR
1825  * may end up partially falling into the page cache, and we should
1826  * shift it into the 'tail' of the xdr_buf before processing.
1827  * To do this efficiently, we need to know the total length
1828  * of data received, which doesn't seem to be available outside
1829  * of the RPC layer.
1830  *
1831  * In the case of WRITE, we also want to put the GETATTR after
1832  * the operation -- in this case because we want to make sure
1833  * we get the post-operation mtime and size.  This means that
1834  * we can't use xdr_encode_pages() as written: we need a variant
1835  * of it which would leave room in the 'tail' iovec.
1836  *
1837  * Both of these changes to the XDR layer would in fact be quite
1838  * minor, but I decided to leave them for a subsequent patch.
1839  */
1840 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1841                 unsigned int pgbase, unsigned int pglen)
1842 {
1843         struct nfs4_readlink args = {
1844                 .fh       = NFS_FH(inode),
1845                 .pgbase   = pgbase,
1846                 .pglen    = pglen,
1847                 .pages    = &page,
1848         };
1849         struct rpc_message msg = {
1850                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1851                 .rpc_argp = &args,
1852                 .rpc_resp = NULL,
1853         };
1854
1855         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1856 }
1857
1858 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1859                 unsigned int pgbase, unsigned int pglen)
1860 {
1861         struct nfs4_exception exception = { };
1862         int err;
1863         do {
1864                 err = nfs4_handle_exception(NFS_SERVER(inode),
1865                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1866                                 &exception);
1867         } while (exception.retry);
1868         return err;
1869 }
1870
1871 /*
1872  * Got race?
1873  * We will need to arrange for the VFS layer to provide an atomic open.
1874  * Until then, this create/open method is prone to inefficiency and race
1875  * conditions due to the lookup, create, and open VFS calls from sys_open()
1876  * placed on the wire.
1877  *
1878  * Given the above sorry state of affairs, I'm simply sending an OPEN.
1879  * The file will be opened again in the subsequent VFS open call
1880  * (nfs4_proc_file_open).
1881  *
1882  * The open for read will just hang around to be used by any process that
1883  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1884  */
1885
1886 static int
1887 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
1888                  int flags, struct nameidata *nd)
1889 {
1890         struct path path = {
1891                 .mnt = nd->mnt,
1892                 .dentry = dentry,
1893         };
1894         struct nfs4_state *state;
1895         struct rpc_cred *cred;
1896         int status = 0;
1897
1898         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1899         if (IS_ERR(cred)) {
1900                 status = PTR_ERR(cred);
1901                 goto out;
1902         }
1903         state = nfs4_do_open(dir, &path, flags, sattr, cred);
1904         put_rpccred(cred);
1905         if (IS_ERR(state)) {
1906                 status = PTR_ERR(state);
1907                 goto out;
1908         }
1909         d_instantiate(dentry, igrab(state->inode));
1910         if (flags & O_EXCL) {
1911                 struct nfs_fattr fattr;
1912                 status = nfs4_do_setattr(state->inode, &fattr, sattr, state);
1913                 if (status == 0)
1914                         nfs_setattr_update_inode(state->inode, sattr);
1915                 nfs_post_op_update_inode(state->inode, &fattr);
1916         }
1917         if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
1918                 status = nfs4_intent_set_file(nd, &path, state);
1919         else
1920                 nfs4_close_state(&path, state, flags);
1921 out:
1922         return status;
1923 }
1924
1925 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1926 {
1927         struct nfs_server *server = NFS_SERVER(dir);
1928         struct nfs4_remove_arg args = {
1929                 .fh = NFS_FH(dir),
1930                 .name = name,
1931                 .bitmask = server->attr_bitmask,
1932         };
1933         struct nfs_fattr dir_attr;
1934         struct nfs4_remove_res  res = {
1935                 .server = server,
1936                 .dir_attr = &dir_attr,
1937         };
1938         struct rpc_message msg = {
1939                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1940                 .rpc_argp       = &args,
1941                 .rpc_resp       = &res,
1942         };
1943         int                     status;
1944
1945         nfs_fattr_init(res.dir_attr);
1946         status = rpc_call_sync(server->client, &msg, 0);
1947         if (status == 0) {
1948                 update_changeattr(dir, &res.cinfo);
1949                 nfs_post_op_update_inode(dir, res.dir_attr);
1950         }
1951         return status;
1952 }
1953
1954 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1955 {
1956         struct nfs4_exception exception = { };
1957         int err;
1958         do {
1959                 err = nfs4_handle_exception(NFS_SERVER(dir),
1960                                 _nfs4_proc_remove(dir, name),
1961                                 &exception);
1962         } while (exception.retry);
1963         return err;
1964 }
1965
1966 struct unlink_desc {
1967         struct nfs4_remove_arg  args;
1968         struct nfs4_remove_res  res;
1969         struct nfs_fattr dir_attr;
1970 };
1971
1972 static int nfs4_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir,
1973                 struct qstr *name)
1974 {
1975         struct nfs_server *server = NFS_SERVER(dir->d_inode);
1976         struct unlink_desc *up;
1977
1978         up = kmalloc(sizeof(*up), GFP_KERNEL);
1979         if (!up)
1980                 return -ENOMEM;
1981
1982         up->args.fh = NFS_FH(dir->d_inode);
1983         up->args.name = name;
1984         up->args.bitmask = server->attr_bitmask;
1985         up->res.server = server;
1986         up->res.dir_attr = &up->dir_attr;
1987
1988         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1989         msg->rpc_argp = &up->args;
1990         msg->rpc_resp = &up->res;
1991         return 0;
1992 }
1993
1994 static int nfs4_proc_unlink_done(struct dentry *dir, struct rpc_task *task)
1995 {
1996         struct rpc_message *msg = &task->tk_msg;
1997         struct unlink_desc *up;
1998
1999         if (msg->rpc_resp != NULL) {
2000                 up = container_of(msg->rpc_resp, struct unlink_desc, res);
2001                 update_changeattr(dir->d_inode, &up->res.cinfo);
2002                 nfs_post_op_update_inode(dir->d_inode, up->res.dir_attr);
2003                 kfree(up);
2004                 msg->rpc_resp = NULL;
2005                 msg->rpc_argp = NULL;
2006         }
2007         return 0;
2008 }
2009
2010 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2011                 struct inode *new_dir, struct qstr *new_name)
2012 {
2013         struct nfs_server *server = NFS_SERVER(old_dir);
2014         struct nfs4_rename_arg arg = {
2015                 .old_dir = NFS_FH(old_dir),
2016                 .new_dir = NFS_FH(new_dir),
2017                 .old_name = old_name,
2018                 .new_name = new_name,
2019                 .bitmask = server->attr_bitmask,
2020         };
2021         struct nfs_fattr old_fattr, new_fattr;
2022         struct nfs4_rename_res res = {
2023                 .server = server,
2024                 .old_fattr = &old_fattr,
2025                 .new_fattr = &new_fattr,
2026         };
2027         struct rpc_message msg = {
2028                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2029                 .rpc_argp = &arg,
2030                 .rpc_resp = &res,
2031         };
2032         int                     status;
2033
2034         nfs_fattr_init(res.old_fattr);
2035         nfs_fattr_init(res.new_fattr);
2036         status = rpc_call_sync(server->client, &msg, 0);
2037
2038         if (!status) {
2039                 update_changeattr(old_dir, &res.old_cinfo);
2040                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2041                 update_changeattr(new_dir, &res.new_cinfo);
2042                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2043         }
2044         return status;
2045 }
2046
2047 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2048                 struct inode *new_dir, struct qstr *new_name)
2049 {
2050         struct nfs4_exception exception = { };
2051         int err;
2052         do {
2053                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2054                                 _nfs4_proc_rename(old_dir, old_name,
2055                                         new_dir, new_name),
2056                                 &exception);
2057         } while (exception.retry);
2058         return err;
2059 }
2060
2061 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2062 {
2063         struct nfs_server *server = NFS_SERVER(inode);
2064         struct nfs4_link_arg arg = {
2065                 .fh     = NFS_FH(inode),
2066                 .dir_fh = NFS_FH(dir),
2067                 .name   = name,
2068                 .bitmask = server->attr_bitmask,
2069         };
2070         struct nfs_fattr fattr, dir_attr;
2071         struct nfs4_link_res res = {
2072                 .server = server,
2073                 .fattr = &fattr,
2074                 .dir_attr = &dir_attr,
2075         };
2076         struct rpc_message msg = {
2077                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2078                 .rpc_argp = &arg,
2079                 .rpc_resp = &res,
2080         };
2081         int                     status;
2082
2083         nfs_fattr_init(res.fattr);
2084         nfs_fattr_init(res.dir_attr);
2085         status = rpc_call_sync(server->client, &msg, 0);
2086         if (!status) {
2087                 update_changeattr(dir, &res.cinfo);
2088                 nfs_post_op_update_inode(dir, res.dir_attr);
2089                 nfs_post_op_update_inode(inode, res.fattr);
2090         }
2091
2092         return status;
2093 }
2094
2095 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2096 {
2097         struct nfs4_exception exception = { };
2098         int err;
2099         do {
2100                 err = nfs4_handle_exception(NFS_SERVER(inode),
2101                                 _nfs4_proc_link(inode, dir, name),
2102                                 &exception);
2103         } while (exception.retry);
2104         return err;
2105 }
2106
2107 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2108                 struct page *page, unsigned int len, struct iattr *sattr)
2109 {
2110         struct nfs_server *server = NFS_SERVER(dir);
2111         struct nfs_fh fhandle;
2112         struct nfs_fattr fattr, dir_fattr;
2113         struct nfs4_create_arg arg = {
2114                 .dir_fh = NFS_FH(dir),
2115                 .server = server,
2116                 .name = &dentry->d_name,
2117                 .attrs = sattr,
2118                 .ftype = NF4LNK,
2119                 .bitmask = server->attr_bitmask,
2120         };
2121         struct nfs4_create_res res = {
2122                 .server = server,
2123                 .fh = &fhandle,
2124                 .fattr = &fattr,
2125                 .dir_fattr = &dir_fattr,
2126         };
2127         struct rpc_message msg = {
2128                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
2129                 .rpc_argp = &arg,
2130                 .rpc_resp = &res,
2131         };
2132         int                     status;
2133
2134         if (len > NFS4_MAXPATHLEN)
2135                 return -ENAMETOOLONG;
2136
2137         arg.u.symlink.pages = &page;
2138         arg.u.symlink.len = len;
2139         nfs_fattr_init(&fattr);
2140         nfs_fattr_init(&dir_fattr);
2141
2142         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2143         if (!status) {
2144                 update_changeattr(dir, &res.dir_cinfo);
2145                 nfs_post_op_update_inode(dir, res.dir_fattr);
2146                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2147         }
2148         return status;
2149 }
2150
2151 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2152                 struct page *page, unsigned int len, struct iattr *sattr)
2153 {
2154         struct nfs4_exception exception = { };
2155         int err;
2156         do {
2157                 err = nfs4_handle_exception(NFS_SERVER(dir),
2158                                 _nfs4_proc_symlink(dir, dentry, page,
2159                                                         len, sattr),
2160                                 &exception);
2161         } while (exception.retry);
2162         return err;
2163 }
2164
2165 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2166                 struct iattr *sattr)
2167 {
2168         struct nfs_server *server = NFS_SERVER(dir);
2169         struct nfs_fh fhandle;
2170         struct nfs_fattr fattr, dir_fattr;
2171         struct nfs4_create_arg arg = {
2172                 .dir_fh = NFS_FH(dir),
2173                 .server = server,
2174                 .name = &dentry->d_name,
2175                 .attrs = sattr,
2176                 .ftype = NF4DIR,
2177                 .bitmask = server->attr_bitmask,
2178         };
2179         struct nfs4_create_res res = {
2180                 .server = server,
2181                 .fh = &fhandle,
2182                 .fattr = &fattr,
2183                 .dir_fattr = &dir_fattr,
2184         };
2185         struct rpc_message msg = {
2186                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2187                 .rpc_argp = &arg,
2188                 .rpc_resp = &res,
2189         };
2190         int                     status;
2191
2192         nfs_fattr_init(&fattr);
2193         nfs_fattr_init(&dir_fattr);
2194
2195         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2196         if (!status) {
2197                 update_changeattr(dir, &res.dir_cinfo);
2198                 nfs_post_op_update_inode(dir, res.dir_fattr);
2199                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2200         }
2201         return status;
2202 }
2203
2204 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2205                 struct iattr *sattr)
2206 {
2207         struct nfs4_exception exception = { };
2208         int err;
2209         do {
2210                 err = nfs4_handle_exception(NFS_SERVER(dir),
2211                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2212                                 &exception);
2213         } while (exception.retry);
2214         return err;
2215 }
2216
2217 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2218                   u64 cookie, struct page *page, unsigned int count, int plus)
2219 {
2220         struct inode            *dir = dentry->d_inode;
2221         struct nfs4_readdir_arg args = {
2222                 .fh = NFS_FH(dir),
2223                 .pages = &page,
2224                 .pgbase = 0,
2225                 .count = count,
2226                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2227         };
2228         struct nfs4_readdir_res res;
2229         struct rpc_message msg = {
2230                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2231                 .rpc_argp = &args,
2232                 .rpc_resp = &res,
2233                 .rpc_cred = cred,
2234         };
2235         int                     status;
2236
2237         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
2238                         dentry->d_parent->d_name.name,
2239                         dentry->d_name.name,
2240                         (unsigned long long)cookie);
2241         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2242         res.pgbase = args.pgbase;
2243         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2244         if (status == 0)
2245                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2246         dprintk("%s: returns %d\n", __FUNCTION__, status);
2247         return status;
2248 }
2249
2250 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2251                   u64 cookie, struct page *page, unsigned int count, int plus)
2252 {
2253         struct nfs4_exception exception = { };
2254         int err;
2255         do {
2256                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2257                                 _nfs4_proc_readdir(dentry, cred, cookie,
2258                                         page, count, plus),
2259                                 &exception);
2260         } while (exception.retry);
2261         return err;
2262 }
2263
2264 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2265                 struct iattr *sattr, dev_t rdev)
2266 {
2267         struct nfs_server *server = NFS_SERVER(dir);
2268         struct nfs_fh fh;
2269         struct nfs_fattr fattr, dir_fattr;
2270         struct nfs4_create_arg arg = {
2271                 .dir_fh = NFS_FH(dir),
2272                 .server = server,
2273                 .name = &dentry->d_name,
2274                 .attrs = sattr,
2275                 .bitmask = server->attr_bitmask,
2276         };
2277         struct nfs4_create_res res = {
2278                 .server = server,
2279                 .fh = &fh,
2280                 .fattr = &fattr,
2281                 .dir_fattr = &dir_fattr,
2282         };
2283         struct rpc_message msg = {
2284                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2285                 .rpc_argp = &arg,
2286                 .rpc_resp = &res,
2287         };
2288         int                     status;
2289         int                     mode = sattr->ia_mode;
2290
2291         nfs_fattr_init(&fattr);
2292         nfs_fattr_init(&dir_fattr);
2293
2294         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2295         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2296         if (S_ISFIFO(mode))
2297                 arg.ftype = NF4FIFO;
2298         else if (S_ISBLK(mode)) {
2299                 arg.ftype = NF4BLK;
2300                 arg.u.device.specdata1 = MAJOR(rdev);
2301                 arg.u.device.specdata2 = MINOR(rdev);
2302         }
2303         else if (S_ISCHR(mode)) {
2304                 arg.ftype = NF4CHR;
2305                 arg.u.device.specdata1 = MAJOR(rdev);
2306                 arg.u.device.specdata2 = MINOR(rdev);
2307         }
2308         else
2309                 arg.ftype = NF4SOCK;
2310
2311         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2312         if (status == 0) {
2313                 update_changeattr(dir, &res.dir_cinfo);
2314                 nfs_post_op_update_inode(dir, res.dir_fattr);
2315                 status = nfs_instantiate(dentry, &fh, &fattr);
2316         }
2317         return status;
2318 }
2319
2320 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2321                 struct iattr *sattr, dev_t rdev)
2322 {
2323         struct nfs4_exception exception = { };
2324         int err;
2325         do {
2326                 err = nfs4_handle_exception(NFS_SERVER(dir),
2327                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2328                                 &exception);
2329         } while (exception.retry);
2330         return err;
2331 }
2332
2333 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2334                  struct nfs_fsstat *fsstat)
2335 {
2336         struct nfs4_statfs_arg args = {
2337                 .fh = fhandle,
2338                 .bitmask = server->attr_bitmask,
2339         };
2340         struct rpc_message msg = {
2341                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2342                 .rpc_argp = &args,
2343                 .rpc_resp = fsstat,
2344         };
2345
2346         nfs_fattr_init(fsstat->fattr);
2347         return rpc_call_sync(server->client, &msg, 0);
2348 }
2349
2350 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2351 {
2352         struct nfs4_exception exception = { };
2353         int err;
2354         do {
2355                 err = nfs4_handle_exception(server,
2356                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2357                                 &exception);
2358         } while (exception.retry);
2359         return err;
2360 }
2361
2362 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2363                 struct nfs_fsinfo *fsinfo)
2364 {
2365         struct nfs4_fsinfo_arg args = {
2366                 .fh = fhandle,
2367                 .bitmask = server->attr_bitmask,
2368         };
2369         struct rpc_message msg = {
2370                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2371                 .rpc_argp = &args,
2372                 .rpc_resp = fsinfo,
2373         };
2374
2375         return rpc_call_sync(server->client, &msg, 0);
2376 }
2377
2378 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2379 {
2380         struct nfs4_exception exception = { };
2381         int err;
2382
2383         do {
2384                 err = nfs4_handle_exception(server,
2385                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2386                                 &exception);
2387         } while (exception.retry);
2388         return err;
2389 }
2390
2391 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2392 {
2393         nfs_fattr_init(fsinfo->fattr);
2394         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2395 }
2396
2397 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2398                 struct nfs_pathconf *pathconf)
2399 {
2400         struct nfs4_pathconf_arg args = {
2401                 .fh = fhandle,
2402                 .bitmask = server->attr_bitmask,
2403         };
2404         struct rpc_message msg = {
2405                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2406                 .rpc_argp = &args,
2407                 .rpc_resp = pathconf,
2408         };
2409
2410         /* None of the pathconf attributes are mandatory to implement */
2411         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2412                 memset(pathconf, 0, sizeof(*pathconf));
2413                 return 0;
2414         }
2415
2416         nfs_fattr_init(pathconf->fattr);
2417         return rpc_call_sync(server->client, &msg, 0);
2418 }
2419
2420 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2421                 struct nfs_pathconf *pathconf)
2422 {
2423         struct nfs4_exception exception = { };
2424         int err;
2425
2426         do {
2427                 err = nfs4_handle_exception(server,
2428                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2429                                 &exception);
2430         } while (exception.retry);
2431         return err;
2432 }
2433
2434 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
2435 {
2436         struct nfs_server *server = NFS_SERVER(data->inode);
2437
2438         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
2439                 rpc_restart_call(task);
2440                 return -EAGAIN;
2441         }
2442         if (task->tk_status > 0)
2443                 renew_lease(server, data->timestamp);
2444         return 0;
2445 }
2446
2447 static void nfs4_proc_read_setup(struct nfs_read_data *data)
2448 {
2449         struct rpc_message msg = {
2450                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
2451                 .rpc_argp = &data->args,
2452                 .rpc_resp = &data->res,
2453                 .rpc_cred = data->cred,
2454         };
2455
2456         data->timestamp   = jiffies;
2457
2458         rpc_call_setup(&data->task, &msg, 0);
2459 }
2460
2461 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
2462 {
2463         struct inode *inode = data->inode;
2464
2465         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2466                 rpc_restart_call(task);
2467                 return -EAGAIN;
2468         }
2469         if (task->tk_status >= 0) {
2470                 renew_lease(NFS_SERVER(inode), data->timestamp);
2471                 nfs_post_op_update_inode(inode, data->res.fattr);
2472         }
2473         return 0;
2474 }
2475
2476 static void nfs4_proc_write_setup(struct nfs_write_data *data, int how)
2477 {
2478         struct rpc_message msg = {
2479                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
2480                 .rpc_argp = &data->args,
2481                 .rpc_resp = &data->res,
2482                 .rpc_cred = data->cred,
2483         };
2484         struct inode *inode = data->inode;
2485         struct nfs_server *server = NFS_SERVER(inode);
2486         int stable;
2487
2488         if (how & FLUSH_STABLE) {
2489                 if (!NFS_I(inode)->ncommit)
2490                         stable = NFS_FILE_SYNC;
2491                 else
2492                         stable = NFS_DATA_SYNC;
2493         } else
2494                 stable = NFS_UNSTABLE;
2495         data->args.stable = stable;
2496         data->args.bitmask = server->attr_bitmask;
2497         data->res.server = server;
2498
2499         data->timestamp   = jiffies;
2500
2501         /* Finalize the task. */
2502         rpc_call_setup(&data->task, &msg, 0);
2503 }
2504
2505 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
2506 {
2507         struct inode *inode = data->inode;
2508
2509         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2510                 rpc_restart_call(task);
2511                 return -EAGAIN;
2512         }
2513         if (task->tk_status >= 0)
2514                 nfs_post_op_update_inode(inode, data->res.fattr);
2515         return 0;
2516 }
2517
2518 static void nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
2519 {
2520         struct rpc_message msg = {
2521                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2522                 .rpc_argp = &data->args,
2523                 .rpc_resp = &data->res,
2524                 .rpc_cred = data->cred,
2525         };
2526         struct nfs_server *server = NFS_SERVER(data->inode);
2527
2528         data->args.bitmask = server->attr_bitmask;
2529         data->res.server = server;
2530
2531         rpc_call_setup(&data->task, &msg, 0);
2532 }
2533
2534 /*
2535  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2536  * standalone procedure for queueing an asynchronous RENEW.
2537  */
2538 static void nfs4_renew_done(struct rpc_task *task, void *data)
2539 {
2540         struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
2541         unsigned long timestamp = (unsigned long)data;
2542
2543         if (task->tk_status < 0) {
2544                 switch (task->tk_status) {
2545                         case -NFS4ERR_STALE_CLIENTID:
2546                         case -NFS4ERR_EXPIRED:
2547                         case -NFS4ERR_CB_PATH_DOWN:
2548                                 nfs4_schedule_state_recovery(clp);
2549                 }
2550                 return;
2551         }
2552         spin_lock(&clp->cl_lock);
2553         if (time_before(clp->cl_last_renewal,timestamp))
2554                 clp->cl_last_renewal = timestamp;
2555         spin_unlock(&clp->cl_lock);
2556 }
2557
2558 static const struct rpc_call_ops nfs4_renew_ops = {
2559         .rpc_call_done = nfs4_renew_done,
2560 };
2561
2562 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
2563 {
2564         struct rpc_message msg = {
2565                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2566                 .rpc_argp       = clp,
2567                 .rpc_cred       = cred,
2568         };
2569
2570         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2571                         &nfs4_renew_ops, (void *)jiffies);
2572 }
2573
2574 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
2575 {
2576         struct rpc_message msg = {
2577                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2578                 .rpc_argp       = clp,
2579                 .rpc_cred       = cred,
2580         };
2581         unsigned long now = jiffies;
2582         int status;
2583
2584         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2585         if (status < 0)
2586                 return status;
2587         spin_lock(&clp->cl_lock);
2588         if (time_before(clp->cl_last_renewal,now))
2589                 clp->cl_last_renewal = now;
2590         spin_unlock(&clp->cl_lock);
2591         return 0;
2592 }
2593
2594 static inline int nfs4_server_supports_acls(struct nfs_server *server)
2595 {
2596         return (server->caps & NFS_CAP_ACLS)
2597                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2598                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2599 }
2600
2601 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2602  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2603  * the stack.
2604  */
2605 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2606
2607 static void buf_to_pages(const void *buf, size_t buflen,
2608                 struct page **pages, unsigned int *pgbase)
2609 {
2610         const void *p = buf;
2611
2612         *pgbase = offset_in_page(buf);
2613         p -= *pgbase;
2614         while (p < buf + buflen) {
2615                 *(pages++) = virt_to_page(p);
2616                 p += PAGE_CACHE_SIZE;
2617         }
2618 }
2619
2620 struct nfs4_cached_acl {
2621         int cached;
2622         size_t len;
2623         char data[0];
2624 };
2625
2626 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2627 {
2628         struct nfs_inode *nfsi = NFS_I(inode);
2629
2630         spin_lock(&inode->i_lock);
2631         kfree(nfsi->nfs4_acl);
2632         nfsi->nfs4_acl = acl;
2633         spin_unlock(&inode->i_lock);
2634 }
2635
2636 static void nfs4_zap_acl_attr(struct inode *inode)
2637 {
2638         nfs4_set_cached_acl(inode, NULL);
2639 }
2640
2641 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2642 {
2643         struct nfs_inode *nfsi = NFS_I(inode);
2644         struct nfs4_cached_acl *acl;
2645         int ret = -ENOENT;
2646
2647         spin_lock(&inode->i_lock);
2648         acl = nfsi->nfs4_acl;
2649         if (acl == NULL)
2650                 goto out;
2651         if (buf == NULL) /* user is just asking for length */
2652                 goto out_len;
2653         if (acl->cached == 0)
2654                 goto out;
2655         ret = -ERANGE; /* see getxattr(2) man page */
2656         if (acl->len > buflen)
2657                 goto out;
2658         memcpy(buf, acl->data, acl->len);
2659 out_len:
2660         ret = acl->len;
2661 out:
2662         spin_unlock(&inode->i_lock);
2663         return ret;
2664 }
2665
2666 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2667 {
2668         struct nfs4_cached_acl *acl;
2669
2670         if (buf && acl_len <= PAGE_SIZE) {
2671                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2672                 if (acl == NULL)
2673                         goto out;
2674                 acl->cached = 1;
2675                 memcpy(acl->data, buf, acl_len);
2676         } else {
2677                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2678                 if (acl == NULL)
2679                         goto out;
2680                 acl->cached = 0;
2681         }
2682         acl->len = acl_len;
2683 out:
2684         nfs4_set_cached_acl(inode, acl);
2685 }
2686
2687 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2688 {
2689         struct page *pages[NFS4ACL_MAXPAGES];
2690         struct nfs_getaclargs args = {
2691                 .fh = NFS_FH(inode),
2692                 .acl_pages = pages,
2693                 .acl_len = buflen,
2694         };
2695         size_t resp_len = buflen;
2696         void *resp_buf;
2697         struct rpc_message msg = {
2698                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2699                 .rpc_argp = &args,
2700                 .rpc_resp = &resp_len,
2701         };
2702         struct page *localpage = NULL;
2703         int ret;
2704
2705         if (buflen < PAGE_SIZE) {
2706                 /* As long as we're doing a round trip to the server anyway,
2707                  * let's be prepared for a page of acl data. */
2708                 localpage = alloc_page(GFP_KERNEL);
2709                 resp_buf = page_address(localpage);
2710                 if (localpage == NULL)
2711                         return -ENOMEM;
2712                 args.acl_pages[0] = localpage;
2713                 args.acl_pgbase = 0;
2714                 resp_len = args.acl_len = PAGE_SIZE;
2715         } else {
2716                 resp_buf = buf;
2717                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2718         }
2719         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2720         if (ret)
2721                 goto out_free;
2722         if (resp_len > args.acl_len)
2723                 nfs4_write_cached_acl(inode, NULL, resp_len);
2724         else
2725                 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2726         if (buf) {
2727                 ret = -ERANGE;
2728                 if (resp_len > buflen)
2729                         goto out_free;
2730                 if (localpage)
2731                         memcpy(buf, resp_buf, resp_len);
2732         }
2733         ret = resp_len;
2734 out_free:
2735         if (localpage)
2736                 __free_page(localpage);
2737         return ret;
2738 }
2739
2740 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2741 {
2742         struct nfs4_exception exception = { };
2743         ssize_t ret;
2744         do {
2745                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
2746                 if (ret >= 0)
2747                         break;
2748                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
2749         } while (exception.retry);
2750         return ret;
2751 }
2752
2753 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2754 {
2755         struct nfs_server *server = NFS_SERVER(inode);
2756         int ret;
2757
2758         if (!nfs4_server_supports_acls(server))
2759                 return -EOPNOTSUPP;
2760         ret = nfs_revalidate_inode(server, inode);
2761         if (ret < 0)
2762                 return ret;
2763         ret = nfs4_read_cached_acl(inode, buf, buflen);
2764         if (ret != -ENOENT)
2765                 return ret;
2766         return nfs4_get_acl_uncached(inode, buf, buflen);
2767 }
2768
2769 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2770 {
2771         struct nfs_server *server = NFS_SERVER(inode);
2772         struct page *pages[NFS4ACL_MAXPAGES];
2773         struct nfs_setaclargs arg = {
2774                 .fh             = NFS_FH(inode),
2775                 .acl_pages      = pages,
2776                 .acl_len        = buflen,
2777         };
2778         struct rpc_message msg = {
2779                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2780                 .rpc_argp       = &arg,
2781                 .rpc_resp       = NULL,
2782         };
2783         int ret;
2784
2785         if (!nfs4_server_supports_acls(server))
2786                 return -EOPNOTSUPP;
2787         nfs_inode_return_delegation(inode);
2788         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2789         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2790         nfs_zap_caches(inode);
2791         return ret;
2792 }
2793
2794 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2795 {
2796         struct nfs4_exception exception = { };
2797         int err;
2798         do {
2799                 err = nfs4_handle_exception(NFS_SERVER(inode),
2800                                 __nfs4_proc_set_acl(inode, buf, buflen),
2801                                 &exception);
2802         } while (exception.retry);
2803         return err;
2804 }
2805
2806 static int
2807 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
2808 {
2809         struct nfs_client *clp = server->nfs_client;
2810
2811         if (!clp || task->tk_status >= 0)
2812                 return 0;
2813         switch(task->tk_status) {
2814                 case -NFS4ERR_STALE_CLIENTID:
2815                 case -NFS4ERR_STALE_STATEID:
2816                 case -NFS4ERR_EXPIRED:
2817                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2818                         nfs4_schedule_state_recovery(clp);
2819                         if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
2820                                 rpc_wake_up_task(task);
2821                         task->tk_status = 0;
2822                         return -EAGAIN;
2823                 case -NFS4ERR_DELAY:
2824                         nfs_inc_server_stats((struct nfs_server *) server,
2825                                                 NFSIOS_DELAY);
2826                 case -NFS4ERR_GRACE:
2827                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
2828                         task->tk_status = 0;
2829                         return -EAGAIN;
2830                 case -NFS4ERR_OLD_STATEID:
2831                         task->tk_status = 0;
2832                         return -EAGAIN;
2833         }
2834         task->tk_status = nfs4_map_errors(task->tk_status);
2835         return 0;
2836 }
2837
2838 static int nfs4_wait_bit_interruptible(void *word)
2839 {
2840         if (signal_pending(current))
2841                 return -ERESTARTSYS;
2842         schedule();
2843         return 0;
2844 }
2845
2846 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp)
2847 {
2848         sigset_t oldset;
2849         int res;
2850
2851         might_sleep();
2852
2853         rwsem_acquire(&clp->cl_sem.dep_map, 0, 0, _RET_IP_);
2854
2855         rpc_clnt_sigmask(clnt, &oldset);
2856         res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER,
2857                         nfs4_wait_bit_interruptible,
2858                         TASK_INTERRUPTIBLE);
2859         rpc_clnt_sigunmask(clnt, &oldset);
2860
2861         rwsem_release(&clp->cl_sem.dep_map, 1, _RET_IP_);
2862         return res;
2863 }
2864
2865 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2866 {
2867         sigset_t oldset;
2868         int res = 0;
2869
2870         might_sleep();
2871
2872         if (*timeout <= 0)
2873                 *timeout = NFS4_POLL_RETRY_MIN;
2874         if (*timeout > NFS4_POLL_RETRY_MAX)
2875                 *timeout = NFS4_POLL_RETRY_MAX;
2876         rpc_clnt_sigmask(clnt, &oldset);
2877         if (clnt->cl_intr) {
2878                 schedule_timeout_interruptible(*timeout);
2879                 if (signalled())
2880                         res = -ERESTARTSYS;
2881         } else
2882                 schedule_timeout_uninterruptible(*timeout);
2883         rpc_clnt_sigunmask(clnt, &oldset);
2884         *timeout <<= 1;
2885         return res;
2886 }
2887
2888 /* This is the error handling routine for processes that are allowed
2889  * to sleep.
2890  */
2891 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
2892 {
2893         struct nfs_client *clp = server->nfs_client;
2894         int ret = errorcode;
2895
2896         exception->retry = 0;
2897         switch(errorcode) {
2898                 case 0:
2899                         return 0;
2900                 case -NFS4ERR_STALE_CLIENTID:
2901                 case -NFS4ERR_STALE_STATEID:
2902                 case -NFS4ERR_EXPIRED:
2903                         nfs4_schedule_state_recovery(clp);
2904                         ret = nfs4_wait_clnt_recover(server->client, clp);
2905                         if (ret == 0)
2906                                 exception->retry = 1;
2907                         break;
2908                 case -NFS4ERR_FILE_OPEN:
2909                 case -NFS4ERR_GRACE:
2910                 case -NFS4ERR_DELAY:
2911                         ret = nfs4_delay(server->client, &exception->timeout);
2912                         if (ret != 0)
2913                                 break;
2914                 case -NFS4ERR_OLD_STATEID:
2915                         exception->retry = 1;
2916         }
2917         /* We failed to handle the error */
2918         return nfs4_map_errors(ret);
2919 }
2920
2921 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
2922 {
2923         nfs4_verifier sc_verifier;
2924         struct nfs4_setclientid setclientid = {
2925                 .sc_verifier = &sc_verifier,
2926                 .sc_prog = program,
2927         };
2928         struct rpc_message msg = {
2929                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2930                 .rpc_argp = &setclientid,
2931                 .rpc_resp = clp,
2932                 .rpc_cred = cred,
2933         };
2934         __be32 *p;
2935         int loop = 0;
2936         int status;
2937
2938         p = (__be32*)sc_verifier.data;
2939         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2940         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2941
2942         for(;;) {
2943                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2944                                 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
2945                                 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.sin_addr),
2946                                 cred->cr_ops->cr_name,
2947                                 clp->cl_id_uniquifier);
2948                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2949                                 sizeof(setclientid.sc_netid), "tcp");
2950                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2951                                 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2952                                 clp->cl_ipaddr, port >> 8, port & 255);
2953
2954                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2955                 if (status != -NFS4ERR_CLID_INUSE)
2956                         break;
2957                 if (signalled())
2958                         break;
2959                 if (loop++ & 1)
2960                         ssleep(clp->cl_lease_time + 1);
2961                 else
2962                         if (++clp->cl_id_uniquifier == 0)
2963                                 break;
2964         }
2965         return status;
2966 }
2967
2968 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2969 {
2970         struct nfs_fsinfo fsinfo;
2971         struct rpc_message msg = {
2972                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2973                 .rpc_argp = clp,
2974                 .rpc_resp = &fsinfo,
2975                 .rpc_cred = cred,
2976         };
2977         unsigned long now;
2978         int status;
2979
2980         now = jiffies;
2981         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2982         if (status == 0) {
2983                 spin_lock(&clp->cl_lock);
2984                 clp->cl_lease_time = fsinfo.lease_time * HZ;
2985                 clp->cl_last_renewal = now;
2986                 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2987                 spin_unlock(&clp->cl_lock);
2988         }
2989         return status;
2990 }
2991
2992 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2993 {
2994         long timeout;
2995         int err;
2996         do {
2997                 err = _nfs4_proc_setclientid_confirm(clp, cred);
2998                 switch (err) {
2999                         case 0:
3000                                 return err;
3001                         case -NFS4ERR_RESOURCE:
3002                                 /* The IBM lawyers misread another document! */
3003                         case -NFS4ERR_DELAY:
3004                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
3005                 }
3006         } while (err == 0);
3007         return err;
3008 }
3009
3010 struct nfs4_delegreturndata {
3011         struct nfs4_delegreturnargs args;
3012         struct nfs4_delegreturnres res;
3013         struct nfs_fh fh;
3014         nfs4_stateid stateid;
3015         struct rpc_cred *cred;
3016         unsigned long timestamp;
3017         struct nfs_fattr fattr;
3018         int rpc_status;
3019 };
3020
3021 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *calldata)
3022 {
3023         struct nfs4_delegreturndata *data = calldata;
3024         struct rpc_message msg = {
3025                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3026                 .rpc_argp = &data->args,
3027                 .rpc_resp = &data->res,
3028                 .rpc_cred = data->cred,
3029         };
3030         nfs_fattr_init(data->res.fattr);
3031         rpc_call_setup(task, &msg, 0);
3032 }
3033
3034 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3035 {
3036         struct nfs4_delegreturndata *data = calldata;
3037         data->rpc_status = task->tk_status;
3038         if (data->rpc_status == 0)
3039                 renew_lease(data->res.server, data->timestamp);
3040 }
3041
3042 static void nfs4_delegreturn_release(void *calldata)
3043 {
3044         struct nfs4_delegreturndata *data = calldata;
3045
3046         put_rpccred(data->cred);
3047         kfree(calldata);
3048 }
3049
3050 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3051         .rpc_call_prepare = nfs4_delegreturn_prepare,
3052         .rpc_call_done = nfs4_delegreturn_done,
3053         .rpc_release = nfs4_delegreturn_release,
3054 };
3055
3056 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3057 {
3058         struct nfs4_delegreturndata *data;
3059         struct nfs_server *server = NFS_SERVER(inode);
3060         struct rpc_task *task;
3061         int status;
3062
3063         data = kmalloc(sizeof(*data), GFP_KERNEL);
3064         if (data == NULL)
3065                 return -ENOMEM;
3066         data->args.fhandle = &data->fh;
3067         data->args.stateid = &data->stateid;
3068         data->args.bitmask = server->attr_bitmask;
3069         nfs_copy_fh(&data->fh, NFS_FH(inode));
3070         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3071         data->res.fattr = &data->fattr;
3072         data->res.server = server;
3073         data->cred = get_rpccred(cred);
3074         data->timestamp = jiffies;
3075         data->rpc_status = 0;
3076
3077         task = rpc_run_task(NFS_CLIENT(inode), RPC_TASK_ASYNC, &nfs4_delegreturn_ops, data);
3078         if (IS_ERR(task))
3079                 return PTR_ERR(task);
3080         status = nfs4_wait_for_completion_rpc_task(task);
3081         if (status == 0) {
3082                 status = data->rpc_status;
3083                 if (status == 0)
3084                         nfs_post_op_update_inode(inode, &data->fattr);
3085         }
3086         rpc_put_task(task);
3087         return status;
3088 }
3089
3090 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3091 {
3092         struct nfs_server *server = NFS_SERVER(inode);
3093         struct nfs4_exception exception = { };
3094         int err;
3095         do {
3096                 err = _nfs4_proc_delegreturn(inode, cred, stateid);
3097                 switch (err) {
3098                         case -NFS4ERR_STALE_STATEID:
3099                         case -NFS4ERR_EXPIRED:
3100                         case 0:
3101                                 return 0;
3102                 }
3103                 err = nfs4_handle_exception(server, err, &exception);
3104         } while (exception.retry);
3105         return err;
3106 }
3107
3108 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3109 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3110
3111 /*
3112  * sleep, with exponential backoff, and retry the LOCK operation.
3113  */
3114 static unsigned long
3115 nfs4_set_lock_task_retry(unsigned long timeout)
3116 {
3117         schedule_timeout_interruptible(timeout);
3118         timeout <<= 1;
3119         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3120                 return NFS4_LOCK_MAXTIMEOUT;
3121         return timeout;
3122 }
3123
3124 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3125 {
3126         struct inode *inode = state->inode;
3127         struct nfs_server *server = NFS_SERVER(inode);
3128         struct nfs_client *clp = server->nfs_client;
3129         struct nfs_lockt_args arg = {
3130                 .fh = NFS_FH(inode),
3131                 .fl = request,
3132         };
3133         struct nfs_lockt_res res = {
3134                 .denied = request,
3135         };
3136         struct rpc_message msg = {
3137                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3138                 .rpc_argp       = &arg,
3139                 .rpc_resp       = &res,
3140                 .rpc_cred       = state->owner->so_cred,
3141         };
3142         struct nfs4_lock_state *lsp;
3143         int status;
3144
3145         down_read(&clp->cl_sem);
3146         arg.lock_owner.clientid = clp->cl_clientid;
3147         status = nfs4_set_lock_state(state, request);
3148         if (status != 0)
3149                 goto out;
3150         lsp = request->fl_u.nfs4_fl.owner;
3151         arg.lock_owner.id = lsp->ls_id.id;
3152         status = rpc_call_sync(server->client, &msg, 0);
3153         switch (status) {
3154                 case 0:
3155                         request->fl_type = F_UNLCK;
3156                         break;
3157                 case -NFS4ERR_DENIED:
3158                         status = 0;
3159         }
3160         request->fl_ops->fl_release_private(request);
3161 out:
3162         up_read(&clp->cl_sem);
3163         return status;
3164 }
3165
3166 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3167 {
3168         struct nfs4_exception exception = { };
3169         int err;
3170
3171         do {
3172                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3173                                 _nfs4_proc_getlk(state, cmd, request),
3174                                 &exception);
3175         } while (exception.retry);
3176         return err;
3177 }
3178
3179 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3180 {
3181         int res = 0;
3182         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3183                 case FL_POSIX:
3184                         res = posix_lock_file_wait(file, fl);
3185                         break;
3186                 case FL_FLOCK:
3187                         res = flock_lock_file_wait(file, fl);
3188                         break;
3189                 default:
3190                         BUG();
3191         }
3192         return res;
3193 }
3194
3195 struct nfs4_unlockdata {
3196         struct nfs_locku_args arg;
3197         struct nfs_locku_res res;
3198         struct nfs4_lock_state *lsp;
3199         struct nfs_open_context *ctx;
3200         struct file_lock fl;
3201         const struct nfs_server *server;
3202         unsigned long timestamp;
3203 };
3204
3205 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3206                 struct nfs_open_context *ctx,
3207                 struct nfs4_lock_state *lsp,
3208                 struct nfs_seqid *seqid)
3209 {
3210         struct nfs4_unlockdata *p;
3211         struct inode *inode = lsp->ls_state->inode;
3212
3213         p = kmalloc(sizeof(*p), GFP_KERNEL);
3214         if (p == NULL)
3215                 return NULL;
3216         p->arg.fh = NFS_FH(inode);
3217         p->arg.fl = &p->fl;
3218         p->arg.seqid = seqid;
3219         p->arg.stateid = &lsp->ls_stateid;
3220         p->lsp = lsp;
3221         atomic_inc(&lsp->ls_count);
3222         /* Ensure we don't close file until we're done freeing locks! */
3223         p->ctx = get_nfs_open_context(ctx);
3224         memcpy(&p->fl, fl, sizeof(p->fl));
3225         p->server = NFS_SERVER(inode);
3226         return p;
3227 }
3228
3229 static void nfs4_locku_release_calldata(void *data)
3230 {
3231         struct nfs4_unlockdata *calldata = data;
3232         nfs_free_seqid(calldata->arg.seqid);
3233         nfs4_put_lock_state(calldata->lsp);
3234         put_nfs_open_context(calldata->ctx);
3235         kfree(calldata);
3236 }
3237
3238 static void nfs4_locku_done(struct rpc_task *task, void *data)
3239 {
3240         struct nfs4_unlockdata *calldata = data;
3241
3242         if (RPC_ASSASSINATED(task))
3243                 return;
3244         nfs_increment_lock_seqid(task->tk_status, calldata->arg.seqid);
3245         switch (task->tk_status) {
3246                 case 0:
3247                         memcpy(calldata->lsp->ls_stateid.data,
3248                                         calldata->res.stateid.data,
3249                                         sizeof(calldata->lsp->ls_stateid.data));
3250                         renew_lease(calldata->server, calldata->timestamp);
3251                         break;
3252                 case -NFS4ERR_STALE_STATEID:
3253                 case -NFS4ERR_EXPIRED:
3254                         break;
3255                 default:
3256                         if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN)
3257                                 rpc_restart_call(task);
3258         }
3259 }
3260
3261 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3262 {
3263         struct nfs4_unlockdata *calldata = data;
3264         struct rpc_message msg = {
3265                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3266                 .rpc_argp       = &calldata->arg,
3267                 .rpc_resp       = &calldata->res,
3268                 .rpc_cred       = calldata->lsp->ls_state->owner->so_cred,
3269         };
3270
3271         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3272                 return;
3273         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3274                 /* Note: exit _without_ running nfs4_locku_done */
3275                 task->tk_action = NULL;
3276                 return;
3277         }
3278         calldata->timestamp = jiffies;
3279         rpc_call_setup(task, &msg, 0);
3280 }
3281
3282 static const struct rpc_call_ops nfs4_locku_ops = {
3283         .rpc_call_prepare = nfs4_locku_prepare,
3284         .rpc_call_done = nfs4_locku_done,
3285         .rpc_release = nfs4_locku_release_calldata,
3286 };
3287
3288 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3289                 struct nfs_open_context *ctx,
3290                 struct nfs4_lock_state *lsp,
3291                 struct nfs_seqid *seqid)
3292 {
3293         struct nfs4_unlockdata *data;
3294
3295         /* Ensure this is an unlock - when canceling a lock, the
3296          * canceled lock is passed in, and it won't be an unlock.
3297          */
3298         fl->fl_type = F_UNLCK;
3299
3300         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3301         if (data == NULL) {
3302                 nfs_free_seqid(seqid);
3303                 return ERR_PTR(-ENOMEM);
3304         }
3305
3306         return rpc_run_task(NFS_CLIENT(lsp->ls_state->inode), RPC_TASK_ASYNC, &nfs4_locku_ops, data);
3307 }
3308
3309 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3310 {
3311         struct nfs_seqid *seqid;
3312         struct nfs4_lock_state *lsp;
3313         struct rpc_task *task;
3314         int status = 0;
3315
3316         status = nfs4_set_lock_state(state, request);
3317         /* Unlock _before_ we do the RPC call */
3318         request->fl_flags |= FL_EXISTS;
3319         if (do_vfs_lock(request->fl_file, request) == -ENOENT)
3320                 goto out;
3321         if (status != 0)
3322                 goto out;
3323         /* Is this a delegated lock? */
3324         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3325                 goto out;
3326         lsp = request->fl_u.nfs4_fl.owner;
3327         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3328         status = -ENOMEM;
3329         if (seqid == NULL)
3330                 goto out;
3331         task = nfs4_do_unlck(request, request->fl_file->private_data, lsp, seqid);
3332         status = PTR_ERR(task);
3333         if (IS_ERR(task))
3334                 goto out;
3335         status = nfs4_wait_for_completion_rpc_task(task);
3336         rpc_put_task(task);
3337 out:
3338         return status;
3339 }
3340
3341 struct nfs4_lockdata {
3342         struct nfs_lock_args arg;
3343         struct nfs_lock_res res;
3344         struct nfs4_lock_state *lsp;
3345         struct nfs_open_context *ctx;
3346         struct file_lock fl;
3347         unsigned long timestamp;
3348         int rpc_status;
3349         int cancelled;
3350 };
3351
3352 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3353                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3354 {
3355         struct nfs4_lockdata *p;
3356         struct inode *inode = lsp->ls_state->inode;
3357         struct nfs_server *server = NFS_SERVER(inode);
3358
3359         p = kzalloc(sizeof(*p), GFP_KERNEL);
3360         if (p == NULL)
3361                 return NULL;
3362
3363         p->arg.fh = NFS_FH(inode);
3364         p->arg.fl = &p->fl;
3365         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3366         if (p->arg.lock_seqid == NULL)
3367                 goto out_free;
3368         p->arg.lock_stateid = &lsp->ls_stateid;
3369         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3370         p->arg.lock_owner.id = lsp->ls_id.id;
3371         p->lsp = lsp;
3372         atomic_inc(&lsp->ls_count);
3373         p->ctx = get_nfs_open_context(ctx);
3374         memcpy(&p->fl, fl, sizeof(p->fl));
3375         return p;
3376 out_free:
3377         kfree(p);
3378         return NULL;
3379 }
3380
3381 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3382 {
3383         struct nfs4_lockdata *data = calldata;
3384         struct nfs4_state *state = data->lsp->ls_state;
3385         struct nfs4_state_owner *sp = state->owner;
3386         struct rpc_message msg = {
3387                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3388                 .rpc_argp = &data->arg,
3389                 .rpc_resp = &data->res,
3390                 .rpc_cred = sp->so_cred,
3391         };
3392
3393         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3394                 return;
3395         dprintk("%s: begin!\n", __FUNCTION__);
3396         /* Do we need to do an open_to_lock_owner? */
3397         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3398                 data->arg.open_seqid = nfs_alloc_seqid(&sp->so_seqid);
3399                 if (data->arg.open_seqid == NULL) {
3400                         data->rpc_status = -ENOMEM;
3401                         task->tk_action = NULL;
3402                         goto out;
3403                 }
3404                 data->arg.open_stateid = &state->stateid;
3405                 data->arg.new_lock_owner = 1;
3406         }
3407         data->timestamp = jiffies;
3408         rpc_call_setup(task, &msg, 0);
3409 out:
3410         dprintk("%s: done!, ret = %d\n", __FUNCTION__, data->rpc_status);
3411 }
3412
3413 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3414 {
3415         struct nfs4_lockdata *data = calldata;
3416
3417         dprintk("%s: begin!\n", __FUNCTION__);
3418
3419         data->rpc_status = task->tk_status;
3420         if (RPC_ASSASSINATED(task))
3421                 goto out;
3422         if (data->arg.new_lock_owner != 0) {
3423                 nfs_increment_open_seqid(data->rpc_status, data->arg.open_seqid);
3424                 if (data->rpc_status == 0)
3425                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3426                 else
3427                         goto out;
3428         }
3429         if (data->rpc_status == 0) {
3430                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3431                                         sizeof(data->lsp->ls_stateid.data));
3432                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3433                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
3434         }
3435         nfs_increment_lock_seqid(data->rpc_status, data->arg.lock_seqid);
3436 out:
3437         dprintk("%s: done, ret = %d!\n", __FUNCTION__, data->rpc_status);
3438 }
3439
3440 static void nfs4_lock_release(void *calldata)
3441 {
3442         struct nfs4_lockdata *data = calldata;
3443
3444         dprintk("%s: begin!\n", __FUNCTION__);
3445         if (data->arg.open_seqid != NULL)
3446                 nfs_free_seqid(data->arg.open_seqid);
3447         if (data->cancelled != 0) {
3448                 struct rpc_task *task;
3449                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3450                                 data->arg.lock_seqid);
3451                 if (!IS_ERR(task))
3452                         rpc_put_task(task);
3453                 dprintk("%s: cancelling lock!\n", __FUNCTION__);
3454         } else
3455                 nfs_free_seqid(data->arg.lock_seqid);
3456         nfs4_put_lock_state(data->lsp);
3457         put_nfs_open_context(data->ctx);
3458         kfree(data);
3459         dprintk("%s: done!\n", __FUNCTION__);
3460 }
3461
3462 static const struct rpc_call_ops nfs4_lock_ops = {
3463         .rpc_call_prepare = nfs4_lock_prepare,
3464         .rpc_call_done = nfs4_lock_done,
3465         .rpc_release = nfs4_lock_release,
3466 };
3467
3468 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3469 {
3470         struct nfs4_lockdata *data;
3471         struct rpc_task *task;
3472         int ret;
3473
3474         dprintk("%s: begin!\n", __FUNCTION__);
3475         data = nfs4_alloc_lockdata(fl, fl->fl_file->private_data,
3476                         fl->fl_u.nfs4_fl.owner);
3477         if (data == NULL)
3478                 return -ENOMEM;
3479         if (IS_SETLKW(cmd))
3480                 data->arg.block = 1;
3481         if (reclaim != 0)
3482                 data->arg.reclaim = 1;
3483         task = rpc_run_task(NFS_CLIENT(state->inode), RPC_TASK_ASYNC,
3484                         &nfs4_lock_ops, data);
3485         if (IS_ERR(task))
3486                 return PTR_ERR(task);
3487         ret = nfs4_wait_for_completion_rpc_task(task);
3488         if (ret == 0) {
3489                 ret = data->rpc_status;
3490                 if (ret == -NFS4ERR_DENIED)
3491                         ret = -EAGAIN;
3492         } else
3493                 data->cancelled = 1;
3494         rpc_put_task(task);
3495         dprintk("%s: done, ret = %d!\n", __FUNCTION__, ret);
3496         return ret;
3497 }
3498
3499 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3500 {
3501         struct nfs_server *server = NFS_SERVER(state->inode);
3502         struct nfs4_exception exception = { };
3503         int err;
3504
3505         do {
3506                 /* Cache the lock if possible... */
3507                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3508                         return 0;
3509                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3510                 if (err != -NFS4ERR_DELAY)
3511                         break;
3512                 nfs4_handle_exception(server, err, &exception);
3513         } while (exception.retry);
3514         return err;
3515 }
3516
3517 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3518 {
3519         struct nfs_server *server = NFS_SERVER(state->inode);
3520         struct nfs4_exception exception = { };
3521         int err;
3522
3523         err = nfs4_set_lock_state(state, request);
3524         if (err != 0)
3525                 return err;
3526         do {
3527                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3528                         return 0;
3529                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3530                 if (err != -NFS4ERR_DELAY)
3531                         break;
3532                 nfs4_handle_exception(server, err, &exception);
3533         } while (exception.retry);
3534         return err;
3535 }
3536
3537 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3538 {
3539         struct nfs_client *clp = state->owner->so_client;
3540         unsigned char fl_flags = request->fl_flags;
3541         int status;
3542
3543         /* Is this a delegated open? */
3544         status = nfs4_set_lock_state(state, request);
3545         if (status != 0)
3546                 goto out;
3547         request->fl_flags |= FL_ACCESS;
3548         status = do_vfs_lock(request->fl_file, request);
3549         if (status < 0)
3550                 goto out;
3551         down_read(&clp->cl_sem);
3552         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3553                 struct nfs_inode *nfsi = NFS_I(state->inode);
3554                 /* Yes: cache locks! */
3555                 down_read(&nfsi->rwsem);
3556                 /* ...but avoid races with delegation recall... */
3557                 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3558                         request->fl_flags = fl_flags & ~FL_SLEEP;
3559                         status = do_vfs_lock(request->fl_file, request);
3560                         up_read(&nfsi->rwsem);
3561                         goto out_unlock;
3562                 }
3563                 up_read(&nfsi->rwsem);
3564         }
3565         status = _nfs4_do_setlk(state, cmd, request, 0);
3566         if (status != 0)
3567                 goto out_unlock;
3568         /* Note: we always want to sleep here! */
3569         request->fl_flags = fl_flags | FL_SLEEP;
3570         if (do_vfs_lock(request->fl_file, request) < 0)
3571                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
3572 out_unlock:
3573         up_read(&clp->cl_sem);
3574 out:
3575         request->fl_flags = fl_flags;
3576         return status;
3577 }
3578
3579 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3580 {
3581         struct nfs4_exception exception = { };
3582         int err;
3583
3584         do {
3585                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3586                                 _nfs4_proc_setlk(state, cmd, request),
3587                                 &exception);
3588         } while (exception.retry);
3589         return err;
3590 }
3591
3592 static int
3593 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3594 {
3595         struct nfs_open_context *ctx;
3596         struct nfs4_state *state;
3597         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3598         int status;
3599
3600         /* verify open state */
3601         ctx = (struct nfs_open_context *)filp->private_data;
3602         state = ctx->state;
3603
3604         if (request->fl_start < 0 || request->fl_end < 0)
3605                 return -EINVAL;
3606
3607         if (IS_GETLK(cmd))
3608                 return nfs4_proc_getlk(state, F_GETLK, request);
3609
3610         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3611                 return -EINVAL;
3612
3613         if (request->fl_type == F_UNLCK)
3614                 return nfs4_proc_unlck(state, cmd, request);
3615
3616         do {
3617                 status = nfs4_proc_setlk(state, cmd, request);
3618                 if ((status != -EAGAIN) || IS_SETLK(cmd))
3619                         break;
3620                 timeout = nfs4_set_lock_task_retry(timeout);
3621                 status = -ERESTARTSYS;
3622                 if (signalled())
3623                         break;
3624         } while(status < 0);
3625         return status;
3626 }
3627
3628 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3629 {
3630         struct nfs_server *server = NFS_SERVER(state->inode);
3631         struct nfs4_exception exception = { };
3632         int err;
3633
3634         err = nfs4_set_lock_state(state, fl);
3635         if (err != 0)
3636                 goto out;
3637         do {
3638                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3639                 if (err != -NFS4ERR_DELAY)
3640                         break;
3641                 err = nfs4_handle_exception(server, err, &exception);
3642         } while (exception.retry);
3643 out:
3644         return err;
3645 }
3646
3647 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3648
3649 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3650                 size_t buflen, int flags)
3651 {
3652         struct inode *inode = dentry->d_inode;
3653
3654         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3655                 return -EOPNOTSUPP;
3656
3657         if (!S_ISREG(inode->i_mode) &&
3658             (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
3659                 return -EPERM;
3660
3661         return nfs4_proc_set_acl(inode, buf, buflen);
3662 }
3663
3664 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
3665  * and that's what we'll do for e.g. user attributes that haven't been set.
3666  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3667  * attributes in kernel-managed attribute namespaces. */
3668 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3669                 size_t buflen)
3670 {
3671         struct inode *inode = dentry->d_inode;
3672
3673         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3674                 return -EOPNOTSUPP;
3675
3676         return nfs4_proc_get_acl(inode, buf, buflen);
3677 }
3678
3679 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3680 {
3681         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
3682
3683         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3684                 return 0;
3685         if (buf && buflen < len)
3686                 return -ERANGE;
3687         if (buf)
3688                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3689         return len;
3690 }
3691
3692 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
3693                 struct nfs4_fs_locations *fs_locations, struct page *page)
3694 {
3695         struct nfs_server *server = NFS_SERVER(dir);
3696         u32 bitmask[2] = {
3697                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3698                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
3699         };
3700         struct nfs4_fs_locations_arg args = {
3701                 .dir_fh = NFS_FH(dir),
3702                 .name = name,
3703                 .page = page,
3704                 .bitmask = bitmask,
3705         };
3706         struct rpc_message msg = {
3707                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3708                 .rpc_argp = &args,
3709                 .rpc_resp = fs_locations,
3710         };
3711         int status;
3712
3713         dprintk("%s: start\n", __FUNCTION__);
3714         nfs_fattr_init(&fs_locations->fattr);
3715         fs_locations->server = server;
3716         fs_locations->nlocations = 0;
3717         status = rpc_call_sync(server->client, &msg, 0);
3718         dprintk("%s: returned status = %d\n", __FUNCTION__, status);
3719         return status;
3720 }
3721
3722 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3723         .recover_open   = nfs4_open_reclaim,
3724         .recover_lock   = nfs4_lock_reclaim,
3725 };
3726
3727 struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3728         .recover_open   = nfs4_open_expired,
3729         .recover_lock   = nfs4_lock_expired,
3730 };
3731
3732 static const struct inode_operations nfs4_file_inode_operations = {
3733         .permission     = nfs_permission,
3734         .getattr        = nfs_getattr,
3735         .setattr        = nfs_setattr,
3736         .getxattr       = nfs4_getxattr,
3737         .setxattr       = nfs4_setxattr,
3738         .listxattr      = nfs4_listxattr,
3739 };
3740
3741 const struct nfs_rpc_ops nfs_v4_clientops = {
3742         .version        = 4,                    /* protocol version */
3743         .dentry_ops     = &nfs4_dentry_operations,
3744         .dir_inode_ops  = &nfs4_dir_inode_operations,
3745         .file_inode_ops = &nfs4_file_inode_operations,
3746         .getroot        = nfs4_proc_get_root,
3747         .getattr        = nfs4_proc_getattr,
3748         .setattr        = nfs4_proc_setattr,
3749         .lookupfh       = nfs4_proc_lookupfh,
3750         .lookup         = nfs4_proc_lookup,
3751         .access         = nfs4_proc_access,
3752         .readlink       = nfs4_proc_readlink,
3753         .create         = nfs4_proc_create,
3754         .remove         = nfs4_proc_remove,
3755         .unlink_setup   = nfs4_proc_unlink_setup,
3756         .unlink_done    = nfs4_proc_unlink_done,
3757         .rename         = nfs4_proc_rename,
3758         .link           = nfs4_proc_link,
3759         .symlink        = nfs4_proc_symlink,
3760         .mkdir          = nfs4_proc_mkdir,
3761         .rmdir          = nfs4_proc_remove,
3762         .readdir        = nfs4_proc_readdir,
3763         .mknod          = nfs4_proc_mknod,
3764         .statfs         = nfs4_proc_statfs,
3765         .fsinfo         = nfs4_proc_fsinfo,
3766         .pathconf       = nfs4_proc_pathconf,
3767         .set_capabilities = nfs4_server_capabilities,
3768         .decode_dirent  = nfs4_decode_dirent,
3769         .read_setup     = nfs4_proc_read_setup,
3770         .read_done      = nfs4_read_done,
3771         .write_setup    = nfs4_proc_write_setup,
3772         .write_done     = nfs4_write_done,
3773         .commit_setup   = nfs4_proc_commit_setup,
3774         .commit_done    = nfs4_commit_done,
3775         .file_open      = nfs_open,
3776         .file_release   = nfs_release,
3777         .lock           = nfs4_proc_lock,
3778         .clear_acl_cache = nfs4_zap_acl_attr,
3779 };
3780
3781 /*
3782  * Local variables:
3783  *  c-basic-offset: 8
3784  * End:
3785  */