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
  55 #define NFSDBG_FACILITY         NFSDBG_PROC
  56
  57 #define NFS4_POLL_RETRY_MIN     (1*HZ)
  58 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  59
  60 static int _nfs4_proc_open_confirm(struct rpc_clnt *clnt, const struct nfs_fh *fh, struct nfs4_state_owner *sp, nfs4_stateid *stateid, struct nfs_seqid *seqid);
  61 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  62 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *);
  63 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry);
  64 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception);
  65 extern u32 *nfs4_decode_dirent(u32 *p, struct nfs_entry *entry, int plus);
  66 extern struct rpc_procinfo nfs4_procedures[];
  67
  68 /* Prevent leaks of NFSv4 errors into userland */
  69 int nfs4_map_errors(int err)
  70 {
  71         if (err < -1000) {
  72                 dprintk("%s could not handle NFSv4 error %d\n",
  73                                 __FUNCTION__, -err);
  74                 return -EIO;
  75         }
  76         return err;
  77 }
  78
  79 /*
  80  * This is our standard bitmap for GETATTR requests.
  81  */
  82 const u32 nfs4_fattr_bitmap[2] = {
  83         FATTR4_WORD0_TYPE
  84         | FATTR4_WORD0_CHANGE
  85         | FATTR4_WORD0_SIZE
  86         | FATTR4_WORD0_FSID
  87         | FATTR4_WORD0_FILEID,
  88         FATTR4_WORD1_MODE
  89         | FATTR4_WORD1_NUMLINKS
  90         | FATTR4_WORD1_OWNER
  91         | FATTR4_WORD1_OWNER_GROUP
  92         | FATTR4_WORD1_RAWDEV
  93         | FATTR4_WORD1_SPACE_USED
  94         | FATTR4_WORD1_TIME_ACCESS
  95         | FATTR4_WORD1_TIME_METADATA
  96         | FATTR4_WORD1_TIME_MODIFY
  97 };
  98
  99 const u32 nfs4_statfs_bitmap[2] = {
 100         FATTR4_WORD0_FILES_AVAIL
 101         | FATTR4_WORD0_FILES_FREE
 102         | FATTR4_WORD0_FILES_TOTAL,
 103         FATTR4_WORD1_SPACE_AVAIL
 104         | FATTR4_WORD1_SPACE_FREE
 105         | FATTR4_WORD1_SPACE_TOTAL
 106 };
 107
 108 const u32 nfs4_pathconf_bitmap[2] = {
 109         FATTR4_WORD0_MAXLINK
 110         | FATTR4_WORD0_MAXNAME,
 111         0
 112 };
 113
 114 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 115                         | FATTR4_WORD0_MAXREAD
 116                         | FATTR4_WORD0_MAXWRITE
 117                         | FATTR4_WORD0_LEASE_TIME,
 118                         0
 119 };
 120
 121 static void nfs4_setup_readdir(u64 cookie, u32 *verifier, struct dentry *dentry,
 122                 struct nfs4_readdir_arg *readdir)
 123 {
 124         u32 *start, *p;
 125
 126         BUG_ON(readdir->count < 80);
 127         if (cookie > 2) {
 128                 readdir->cookie = cookie;
 129                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 130                 return;
 131         }
 132
 133         readdir->cookie = 0;
 134         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 135         if (cookie == 2)
 136                 return;
 137
 138         /*
 139          * NFSv4 servers do not return entries for '.' and '..'
 140          * Therefore, we fake these entries here.  We let '.'
 141          * have cookie 0 and '..' have cookie 1.  Note that
 142          * when talking to the server, we always send cookie 0
 143          * instead of 1 or 2.
 144          */
 145         start = p = (u32 *)kmap_atomic(*readdir->pages, KM_USER0);
 146
 147         if (cookie == 0) {
 148                 *p++ = xdr_one;                                  /* next */
 149                 *p++ = xdr_zero;                   /* cookie, first word */
 150                 *p++ = xdr_one;                   /* cookie, second word */
 151                 *p++ = xdr_one;                             /* entry len */
 152                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 153                 p++;
 154                 *p++ = xdr_one;                         /* bitmap length */
 155                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 156                 *p++ = htonl(8);              /* attribute buffer length */
 157                 p = xdr_encode_hyper(p, dentry->d_inode->i_ino);
 158         }
 159
 160         *p++ = xdr_one;                                  /* next */
 161         *p++ = xdr_zero;                   /* cookie, first word */
 162         *p++ = xdr_two;                   /* cookie, second word */
 163         *p++ = xdr_two;                             /* entry len */
 164         memcpy(p, "..\0\0", 4);                         /* entry */
 165         p++;
 166         *p++ = xdr_one;                         /* bitmap length */
 167         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 168         *p++ = htonl(8);              /* attribute buffer length */
 169         p = xdr_encode_hyper(p, dentry->d_parent->d_inode->i_ino);
 170
 171         readdir->pgbase = (char *)p - (char *)start;
 172         readdir->count -= readdir->pgbase;
 173         kunmap_atomic(start, KM_USER0);
 174 }
 175
 176 static void
 177 renew_lease(struct nfs_server *server, unsigned long timestamp)
 178 {
 179         struct nfs4_client *clp = server->nfs4_state;
 180         spin_lock(&clp->cl_lock);
 181         if (time_before(clp->cl_last_renewal,timestamp))
 182                 clp->cl_last_renewal = timestamp;
 183         spin_unlock(&clp->cl_lock);
 184 }
 185
 186 static void update_changeattr(struct inode *inode, struct nfs4_change_info *cinfo)
 187 {
 188         struct nfs_inode *nfsi = NFS_I(inode);
 189
 190         if (cinfo->before == nfsi->change_attr && cinfo->atomic)
 191                 nfsi->change_attr = cinfo->after;
 192 }
 193
 194 /* Helper for asynchronous RPC calls */
 195 static int nfs4_call_async(struct rpc_clnt *clnt, rpc_action tk_begin,
 196                 rpc_action tk_exit, void *calldata)
 197 {
 198         struct rpc_task *task;
 199
 200         if (!(task = rpc_new_task(clnt, tk_exit, RPC_TASK_ASYNC)))
 201                 return -ENOMEM;
 202
 203         task->tk_calldata = calldata;
 204         task->tk_action = tk_begin;
 205         rpc_execute(task);
 206         return 0;
 207 }
 208
 209 static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
 210 {
 211         struct inode *inode = state->inode;
 212
 213         open_flags &= (FMODE_READ|FMODE_WRITE);
 214         /* Protect against nfs4_find_state() */
 215         spin_lock(&state->owner->so_lock);
 216         spin_lock(&inode->i_lock);
 217         state->state |= open_flags;
 218         /* NB! List reordering - see the reclaim code for why.  */
 219         if ((open_flags & FMODE_WRITE) && 0 == state->nwriters++)
 220                 list_move(&state->open_states, &state->owner->so_states);
 221         if (open_flags & FMODE_READ)
 222                 state->nreaders++;
 223         memcpy(&state->stateid, stateid, sizeof(state->stateid));
 224         spin_unlock(&inode->i_lock);
 225         spin_unlock(&state->owner->so_lock);
 226 }
 227
 228 /*
 229  * OPEN_RECLAIM:
 230  *      reclaim state on the server after a reboot.
 231  */
 232 static int _nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
 233 {
 234         struct inode *inode = state->inode;
 235         struct nfs_server *server = NFS_SERVER(inode);
 236         struct nfs_delegation *delegation = NFS_I(inode)->delegation;
 237         struct nfs_openargs o_arg = {
 238                 .fh = NFS_FH(inode),
 239                 .id = sp->so_id,
 240                 .open_flags = state->state,
 241                 .clientid = server->nfs4_state->cl_clientid,
 242                 .claim = NFS4_OPEN_CLAIM_PREVIOUS,
 243                 .bitmask = server->attr_bitmask,
 244         };
 245         struct nfs_openres o_res = {
 246                 .server = server,       /* Grrr */
 247         };
 248         struct rpc_message msg = {
 249                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR],
 250                 .rpc_argp       = &o_arg,
 251                 .rpc_resp       = &o_res,
 252                 .rpc_cred       = sp->so_cred,
 253         };
 254         int status;
 255
 256         if (delegation != NULL) {
 257                 if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
 258                         memcpy(&state->stateid, &delegation->stateid,
 259                                         sizeof(state->stateid));
 260                         set_bit(NFS_DELEGATED_STATE, &state->flags);
 261                         return 0;
 262                 }
 263                 o_arg.u.delegation_type = delegation->type;
 264         }
 265         o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 266         if (o_arg.seqid == NULL)
 267                 return -ENOMEM;
 268         status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
 269         /* Confirm the sequence as being established */
 270         nfs_confirm_seqid(&sp->so_seqid, status);
 271         nfs_increment_open_seqid(status, o_arg.seqid);
 272         if (status == 0) {
 273                 memcpy(&state->stateid, &o_res.stateid, sizeof(state->stateid));
 274                 if (o_res.delegation_type != 0) {
 275                         nfs_inode_reclaim_delegation(inode, sp->so_cred, &o_res);
 276                         /* Did the server issue an immediate delegation recall? */
 277                         if (o_res.do_recall)
 278                                 nfs_async_inode_return_delegation(inode, &o_res.stateid);
 279                 }
 280         }
 281         nfs_free_seqid(o_arg.seqid);
 282         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 283         /* Ensure we update the inode attributes */
 284         NFS_CACHEINV(inode);
 285         return status;
 286 }
 287
 288 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
 289 {
 290         struct nfs_server *server = NFS_SERVER(state->inode);
 291         struct nfs4_exception exception = { };
 292         int err;
 293         do {
 294                 err = _nfs4_open_reclaim(sp, state);
 295                 if (err != -NFS4ERR_DELAY)
 296                         break;
 297                 nfs4_handle_exception(server, err, &exception);
 298         } while (exception.retry);
 299         return err;
 300 }
 301
 302 static int _nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
 303 {
 304         struct nfs4_state_owner  *sp  = state->owner;
 305         struct inode *inode = dentry->d_inode;
 306         struct nfs_server *server = NFS_SERVER(inode);
 307         struct dentry *parent = dget_parent(dentry);
 308         struct nfs_openargs arg = {
 309                 .fh = NFS_FH(parent->d_inode),
 310                 .clientid = server->nfs4_state->cl_clientid,
 311                 .name = &dentry->d_name,
 312                 .id = sp->so_id,
 313                 .server = server,
 314                 .bitmask = server->attr_bitmask,
 315                 .claim = NFS4_OPEN_CLAIM_DELEGATE_CUR,
 316         };
 317         struct nfs_openres res = {
 318                 .server = server,
 319         };
 320         struct  rpc_message msg = {
 321                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR],
 322                 .rpc_argp       = &arg,
 323                 .rpc_resp       = &res,
 324                 .rpc_cred       = sp->so_cred,
 325         };
 326         int status = 0;
 327
 328         if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
 329                 goto out;
 330         if (state->state == 0)
 331                 goto out;
 332         arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 333         status = -ENOMEM;
 334         if (arg.seqid == NULL)
 335                 goto out;
 336         arg.open_flags = state->state;
 337         memcpy(arg.u.delegation.data, state->stateid.data, sizeof(arg.u.delegation.data));
 338         status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
 339         nfs_increment_open_seqid(status, arg.seqid);
 340         if (status != 0)
 341                 goto out_free;
 342         if(res.rflags & NFS4_OPEN_RESULT_CONFIRM) {
 343                 status = _nfs4_proc_open_confirm(server->client, NFS_FH(inode),
 344                                 sp, &res.stateid, arg.seqid);
 345                 if (status != 0)
 346                         goto out_free;
 347         }
 348         nfs_confirm_seqid(&sp->so_seqid, 0);
 349         if (status >= 0) {
 350                 memcpy(state->stateid.data, res.stateid.data,
 351                                 sizeof(state->stateid.data));
 352                 clear_bit(NFS_DELEGATED_STATE, &state->flags);
 353         }
 354 out_free:
 355         nfs_free_seqid(arg.seqid);
 356 out:
 357         dput(parent);
 358         return status;
 359 }
 360
 361 int nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
 362 {
 363         struct nfs4_exception exception = { };
 364         struct nfs_server *server = NFS_SERVER(dentry->d_inode);
 365         int err;
 366         do {
 367                 err = _nfs4_open_delegation_recall(dentry, state);
 368                 switch (err) {
 369                         case 0:
 370                                 return err;
 371                         case -NFS4ERR_STALE_CLIENTID:
 372                         case -NFS4ERR_STALE_STATEID:
 373                         case -NFS4ERR_EXPIRED:
 374                                 /* Don't recall a delegation if it was lost */
 375                                 nfs4_schedule_state_recovery(server->nfs4_state);
 376                                 return err;
 377                 }
 378                 err = nfs4_handle_exception(server, err, &exception);
 379         } while (exception.retry);
 380         return err;
 381 }
 382
 383 static int _nfs4_proc_open_confirm(struct rpc_clnt *clnt, const struct nfs_fh *fh, struct nfs4_state_owner *sp, nfs4_stateid *stateid, struct nfs_seqid *seqid)
 384 {
 385         struct nfs_open_confirmargs arg = {
 386                 .fh             = fh,
 387                 .seqid          = seqid,
 388                 .stateid        = *stateid,
 389         };
 390         struct nfs_open_confirmres res;
 391         struct  rpc_message msg = {
 392                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
 393                 .rpc_argp       = &arg,
 394                 .rpc_resp       = &res,
 395                 .rpc_cred       = sp->so_cred,
 396         };
 397         int status;
 398
 399         status = rpc_call_sync(clnt, &msg, RPC_TASK_NOINTR);
 400         /* Confirm the sequence as being established */
 401         nfs_confirm_seqid(&sp->so_seqid, status);
 402         nfs_increment_open_seqid(status, seqid);
 403         if (status >= 0)
 404                 memcpy(stateid, &res.stateid, sizeof(*stateid));
 405         return status;
 406 }
 407
 408 static int _nfs4_proc_open(struct inode *dir, struct nfs4_state_owner  *sp, struct nfs_openargs *o_arg, struct nfs_openres *o_res)
 409 {
 410         struct nfs_server *server = NFS_SERVER(dir);
 411         struct rpc_message msg = {
 412                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
 413                 .rpc_argp = o_arg,
 414                 .rpc_resp = o_res,
 415                 .rpc_cred = sp->so_cred,
 416         };
 417         int status;
 418
 419         /* Update sequence id. The caller must serialize! */
 420         o_arg->id = sp->so_id;
 421         o_arg->clientid = sp->so_client->cl_clientid;
 422
 423         status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
 424         if (status == 0) {
 425                 /* OPEN on anything except a regular file is disallowed in NFSv4 */
 426                 switch (o_res->f_attr->mode & S_IFMT) {
 427                         case S_IFREG:
 428                                 break;
 429                         case S_IFLNK:
 430                                 status = -ELOOP;
 431                                 break;
 432                         case S_IFDIR:
 433                                 status = -EISDIR;
 434                                 break;
 435                         default:
 436                                 status = -ENOTDIR;
 437                 }
 438         }
 439
 440         nfs_increment_open_seqid(status, o_arg->seqid);
 441         if (status != 0)
 442                 goto out;
 443         update_changeattr(dir, &o_res->cinfo);
 444         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
 445                 status = _nfs4_proc_open_confirm(server->client, &o_res->fh,
 446                                 sp, &o_res->stateid, o_arg->seqid);
 447                 if (status != 0)
 448                         goto out;
 449         }
 450         nfs_confirm_seqid(&sp->so_seqid, 0);
 451         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
 452                 status = server->rpc_ops->getattr(server, &o_res->fh, o_res->f_attr);
 453 out:
 454         return status;
 455 }
 456
 457 static int _nfs4_do_access(struct inode *inode, struct rpc_cred *cred, int openflags)
 458 {
 459         struct nfs_access_entry cache;
 460         int mask = 0;
 461         int status;
 462
 463         if (openflags & FMODE_READ)
 464                 mask |= MAY_READ;
 465         if (openflags & FMODE_WRITE)
 466                 mask |= MAY_WRITE;
 467         status = nfs_access_get_cached(inode, cred, &cache);
 468         if (status == 0)
 469                 goto out;
 470
 471         /* Be clever: ask server to check for all possible rights */
 472         cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ;
 473         cache.cred = cred;
 474         cache.jiffies = jiffies;
 475         status = _nfs4_proc_access(inode, &cache);
 476         if (status != 0)
 477                 return status;
 478         nfs_access_add_cache(inode, &cache);
 479 out:
 480         if ((cache.mask & mask) == mask)
 481                 return 0;
 482         return -EACCES;
 483 }
 484
 485 /*
 486  * OPEN_EXPIRED:
 487  *      reclaim state on the server after a network partition.
 488  *      Assumes caller holds the appropriate lock
 489  */
 490 static int _nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
 491 {
 492         struct dentry *parent = dget_parent(dentry);
 493         struct inode *dir = parent->d_inode;
 494         struct inode *inode = state->inode;
 495         struct nfs_server *server = NFS_SERVER(dir);
 496         struct nfs_delegation *delegation = NFS_I(inode)->delegation;
 497         struct nfs_fattr        f_attr;
 498         struct nfs_openargs o_arg = {
 499                 .fh = NFS_FH(dir),
 500                 .open_flags = state->state,
 501                 .name = &dentry->d_name,
 502                 .bitmask = server->attr_bitmask,
 503                 .claim = NFS4_OPEN_CLAIM_NULL,
 504         };
 505         struct nfs_openres o_res = {
 506                 .f_attr = &f_attr,
 507                 .server = server,
 508         };
 509         int status = 0;
 510
 511         if (delegation != NULL && !(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
 512                 status = _nfs4_do_access(inode, sp->so_cred, state->state);
 513                 if (status < 0)
 514                         goto out;
 515                 memcpy(&state->stateid, &delegation->stateid, sizeof(state->stateid));
 516                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 517                 goto out;
 518         }
 519         o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 520         status = -ENOMEM;
 521         if (o_arg.seqid == NULL)
 522                 goto out;
 523         nfs_fattr_init(&f_attr);
 524         status = _nfs4_proc_open(dir, sp, &o_arg, &o_res);
 525         if (status != 0)
 526                 goto out_nodeleg;
 527         /* Check if files differ */
 528         if ((f_attr.mode & S_IFMT) != (inode->i_mode & S_IFMT))
 529                 goto out_stale;
 530         /* Has the file handle changed? */
 531         if (nfs_compare_fh(&o_res.fh, NFS_FH(inode)) != 0) {
 532                 /* Verify if the change attributes are the same */
 533                 if (f_attr.change_attr != NFS_I(inode)->change_attr)
 534                         goto out_stale;
 535                 if (nfs_size_to_loff_t(f_attr.size) != inode->i_size)
 536                         goto out_stale;
 537                 /* Lets just pretend that this is the same file */
 538                 nfs_copy_fh(NFS_FH(inode), &o_res.fh);
 539                 NFS_I(inode)->fileid = f_attr.fileid;
 540         }
 541         memcpy(&state->stateid, &o_res.stateid, sizeof(state->stateid));
 542         if (o_res.delegation_type != 0) {
 543                 if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM))
 544                         nfs_inode_set_delegation(inode, sp->so_cred, &o_res);
 545                 else
 546                         nfs_inode_reclaim_delegation(inode, sp->so_cred, &o_res);
 547         }
 548 out_nodeleg:
 549         nfs_free_seqid(o_arg.seqid);
 550         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 551 out:
 552         dput(parent);
 553         return status;
 554 out_stale:
 555         status = -ESTALE;
 556         /* Invalidate the state owner so we don't ever use it again */
 557         nfs4_drop_state_owner(sp);
 558         d_drop(dentry);
 559         /* Should we be trying to close that stateid? */
 560         goto out_nodeleg;
 561 }
 562
 563 static inline int nfs4_do_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
 564 {
 565         struct nfs_server *server = NFS_SERVER(dentry->d_inode);
 566         struct nfs4_exception exception = { };
 567         int err;
 568
 569         do {
 570                 err = _nfs4_open_expired(sp, state, dentry);
 571                 if (err == -NFS4ERR_DELAY)
 572                         nfs4_handle_exception(server, err, &exception);
 573         } while (exception.retry);
 574         return err;
 575 }
 576
 577 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
 578 {
 579         struct nfs_inode *nfsi = NFS_I(state->inode);
 580         struct nfs_open_context *ctx;
 581         int status;
 582
 583         spin_lock(&state->inode->i_lock);
 584         list_for_each_entry(ctx, &nfsi->open_files, list) {
 585                 if (ctx->state != state)
 586                         continue;
 587                 get_nfs_open_context(ctx);
 588                 spin_unlock(&state->inode->i_lock);
 589                 status = nfs4_do_open_expired(sp, state, ctx->dentry);
 590                 put_nfs_open_context(ctx);
 591                 return status;
 592         }
 593         spin_unlock(&state->inode->i_lock);
 594         return -ENOENT;
 595 }
 596
 597 /*
 598  * Returns an nfs4_state + an extra reference to the inode
 599  */
 600 static int _nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred, struct nfs4_state **res)
 601 {
 602         struct nfs_delegation *delegation;
 603         struct nfs_server *server = NFS_SERVER(inode);
 604         struct nfs4_client *clp = server->nfs4_state;
 605         struct nfs_inode *nfsi = NFS_I(inode);
 606         struct nfs4_state_owner *sp = NULL;
 607         struct nfs4_state *state = NULL;
 608         int open_flags = flags & (FMODE_READ|FMODE_WRITE);
 609         int err;
 610
 611         /* Protect against reboot recovery - NOTE ORDER! */
 612         down_read(&clp->cl_sem);
 613         /* Protect against delegation recall */
 614         down_read(&nfsi->rwsem);
 615         delegation = NFS_I(inode)->delegation;
 616         err = -ENOENT;
 617         if (delegation == NULL || (delegation->type & open_flags) != open_flags)
 618                 goto out_err;
 619         err = -ENOMEM;
 620         if (!(sp = nfs4_get_state_owner(server, cred))) {
 621                 dprintk("%s: nfs4_get_state_owner failed!\n", __FUNCTION__);
 622                 goto out_err;
 623         }
 624         state = nfs4_get_open_state(inode, sp);
 625         if (state == NULL)
 626                 goto out_err;
 627
 628         err = -ENOENT;
 629         if ((state->state & open_flags) == open_flags) {
 630                 spin_lock(&inode->i_lock);
 631                 if (open_flags & FMODE_READ)
 632                         state->nreaders++;
 633                 if (open_flags & FMODE_WRITE)
 634                         state->nwriters++;
 635                 spin_unlock(&inode->i_lock);
 636                 goto out_ok;
 637         } else if (state->state != 0)
 638                 goto out_err;
 639
 640         lock_kernel();
 641         err = _nfs4_do_access(inode, cred, open_flags);
 642         unlock_kernel();
 643         if (err != 0)
 644                 goto out_err;
 645         set_bit(NFS_DELEGATED_STATE, &state->flags);
 646         update_open_stateid(state, &delegation->stateid, open_flags);
 647 out_ok:
 648         nfs4_put_state_owner(sp);
 649         up_read(&nfsi->rwsem);
 650         up_read(&clp->cl_sem);
 651         igrab(inode);
 652         *res = state;
 653         return 0;
 654 out_err:
 655         if (sp != NULL) {
 656                 if (state != NULL)
 657                         nfs4_put_open_state(state);
 658                 nfs4_put_state_owner(sp);
 659         }
 660         up_read(&nfsi->rwsem);
 661         up_read(&clp->cl_sem);
 662         if (err != -EACCES)
 663                 nfs_inode_return_delegation(inode);
 664         return err;
 665 }
 666
 667 static struct nfs4_state *nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred)
 668 {
 669         struct nfs4_exception exception = { };
 670         struct nfs4_state *res;
 671         int err;
 672
 673         do {
 674                 err = _nfs4_open_delegated(inode, flags, cred, &res);
 675                 if (err == 0)
 676                         break;
 677                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(inode),
 678                                         err, &exception));
 679         } while (exception.retry);
 680         return res;
 681 }
 682
 683 /*
 684  * Returns an nfs4_state + an referenced inode
 685  */
 686 static int _nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
 687 {
 688         struct nfs4_state_owner  *sp;
 689         struct nfs4_state     *state = NULL;
 690         struct nfs_server       *server = NFS_SERVER(dir);
 691         struct nfs4_client *clp = server->nfs4_state;
 692         struct inode *inode = NULL;
 693         int                     status;
 694         struct nfs_fattr        f_attr;
 695         struct nfs_openargs o_arg = {
 696                 .fh             = NFS_FH(dir),
 697                 .open_flags     = flags,
 698                 .name           = &dentry->d_name,
 699                 .server         = server,
 700                 .bitmask = server->attr_bitmask,
 701                 .claim = NFS4_OPEN_CLAIM_NULL,
 702         };
 703         struct nfs_openres o_res = {
 704                 .f_attr         = &f_attr,
 705                 .server         = server,
 706         };
 707
 708         /* Protect against reboot recovery conflicts */
 709         down_read(&clp->cl_sem);
 710         status = -ENOMEM;
 711         if (!(sp = nfs4_get_state_owner(server, cred))) {
 712                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
 713                 goto out_err;
 714         }
 715         if (flags & O_EXCL) {
 716                 u32 *p = (u32 *) o_arg.u.verifier.data;
 717                 p[0] = jiffies;
 718                 p[1] = current->pid;
 719         } else
 720                 o_arg.u.attrs = sattr;
 721         /* Serialization for the sequence id */
 722
 723         o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 724         if (o_arg.seqid == NULL)
 725                 return -ENOMEM;
 726         nfs_fattr_init(&f_attr);
 727         status = _nfs4_proc_open(dir, sp, &o_arg, &o_res);
 728         if (status != 0)
 729                 goto out_err;
 730
 731         status = -ENOMEM;
 732         inode = nfs_fhget(dir->i_sb, &o_res.fh, &f_attr);
 733         if (!inode)
 734                 goto out_err;
 735         state = nfs4_get_open_state(inode, sp);
 736         if (!state)
 737                 goto out_err;
 738         update_open_stateid(state, &o_res.stateid, flags);
 739         if (o_res.delegation_type != 0)
 740                 nfs_inode_set_delegation(inode, cred, &o_res);
 741         nfs_free_seqid(o_arg.seqid);
 742         nfs4_put_state_owner(sp);
 743         up_read(&clp->cl_sem);
 744         *res = state;
 745         return 0;
 746 out_err:
 747         if (sp != NULL) {
 748                 if (state != NULL)
 749                         nfs4_put_open_state(state);
 750                 nfs_free_seqid(o_arg.seqid);
 751                 nfs4_put_state_owner(sp);
 752         }
 753         /* Note: clp->cl_sem must be released before nfs4_put_open_state()! */
 754         up_read(&clp->cl_sem);
 755         if (inode != NULL)
 756                 iput(inode);
 757         *res = NULL;
 758         return status;
 759 }
 760
 761
 762 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred)
 763 {
 764         struct nfs4_exception exception = { };
 765         struct nfs4_state *res;
 766         int status;
 767
 768         do {
 769                 status = _nfs4_do_open(dir, dentry, flags, sattr, cred, &res);
 770                 if (status == 0)
 771                         break;
 772                 /* NOTE: BAD_SEQID means the server and client disagree about the
 773                  * book-keeping w.r.t. state-changing operations
 774                  * (OPEN/CLOSE/LOCK/LOCKU...)
 775                  * It is actually a sign of a bug on the client or on the server.
 776                  *
 777                  * If we receive a BAD_SEQID error in the particular case of
 778                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
 779                  * have unhashed the old state_owner for us, and that we can
 780                  * therefore safely retry using a new one. We should still warn
 781                  * the user though...
 782                  */
 783                 if (status == -NFS4ERR_BAD_SEQID) {
 784                         printk(KERN_WARNING "NFS: v4 server returned a bad sequence-id error!\n");
 785                         exception.retry = 1;
 786                         continue;
 787                 }
 788                 /*
 789                  * BAD_STATEID on OPEN means that the server cancelled our
 790                  * state before it received the OPEN_CONFIRM.
 791                  * Recover by retrying the request as per the discussion
 792                  * on Page 181 of RFC3530.
 793                  */
 794                 if (status == -NFS4ERR_BAD_STATEID) {
 795                         exception.retry = 1;
 796                         continue;
 797                 }
 798                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
 799                                         status, &exception));
 800         } while (exception.retry);
 801         return res;
 802 }
 803
 804 static int _nfs4_do_setattr(struct nfs_server *server, struct nfs_fattr *fattr,
 805                 struct nfs_fh *fhandle, struct iattr *sattr,
 806                 struct nfs4_state *state)
 807 {
 808         struct nfs_setattrargs  arg = {
 809                 .fh             = fhandle,
 810                 .iap            = sattr,
 811                 .server         = server,
 812                 .bitmask = server->attr_bitmask,
 813         };
 814         struct nfs_setattrres  res = {
 815                 .fattr          = fattr,
 816                 .server         = server,
 817         };
 818         struct rpc_message msg = {
 819                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
 820                 .rpc_argp       = &arg,
 821                 .rpc_resp       = &res,
 822         };
 823         int status;
 824
 825         nfs_fattr_init(fattr);
 826
 827         if (state != NULL) {
 828                 msg.rpc_cred = state->owner->so_cred;
 829                 nfs4_copy_stateid(&arg.stateid, state, current->files);
 830         } else
 831                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
 832
 833         status = rpc_call_sync(server->client, &msg, 0);
 834         return status;
 835 }
 836
 837 static int nfs4_do_setattr(struct nfs_server *server, struct nfs_fattr *fattr,
 838                 struct nfs_fh *fhandle, struct iattr *sattr,
 839                 struct nfs4_state *state)
 840 {
 841         struct nfs4_exception exception = { };
 842         int err;
 843         do {
 844                 err = nfs4_handle_exception(server,
 845                                 _nfs4_do_setattr(server, fattr, fhandle, sattr,
 846                                         state),
 847                                 &exception);
 848         } while (exception.retry);
 849         return err;
 850 }
 851
 852 struct nfs4_closedata {
 853         struct inode *inode;
 854         struct nfs4_state *state;
 855         struct nfs_closeargs arg;
 856         struct nfs_closeres res;
 857 };
 858
 859 static void nfs4_free_closedata(struct nfs4_closedata *calldata)
 860 {
 861         struct nfs4_state *state = calldata->state;
 862         struct nfs4_state_owner *sp = state->owner;
 863
 864         nfs4_put_open_state(calldata->state);
 865         nfs_free_seqid(calldata->arg.seqid);
 866         nfs4_put_state_owner(sp);
 867         kfree(calldata);
 868 }
 869
 870 static void nfs4_close_done(struct rpc_task *task)
 871 {
 872         struct nfs4_closedata *calldata = (struct nfs4_closedata *)task->tk_calldata;
 873         struct nfs4_state *state = calldata->state;
 874         struct nfs_server *server = NFS_SERVER(calldata->inode);
 875
 876         /* hmm. we are done with the inode, and in the process of freeing
 877          * the state_owner. we keep this around to process errors
 878          */
 879         nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid);
 880         switch (task->tk_status) {
 881                 case 0:
 882                         memcpy(&state->stateid, &calldata->res.stateid,
 883                                         sizeof(state->stateid));
 884                         break;
 885                 case -NFS4ERR_STALE_STATEID:
 886                 case -NFS4ERR_EXPIRED:
 887                         state->state = calldata->arg.open_flags;
 888                         nfs4_schedule_state_recovery(server->nfs4_state);
 889                         break;
 890                 default:
 891                         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
 892                                 rpc_restart_call(task);
 893                                 return;
 894                         }
 895         }
 896         state->state = calldata->arg.open_flags;
 897         nfs4_free_closedata(calldata);
 898 }
 899
 900 static void nfs4_close_begin(struct rpc_task *task)
 901 {
 902         struct nfs4_closedata *calldata = (struct nfs4_closedata *)task->tk_calldata;
 903         struct nfs4_state *state = calldata->state;
 904         struct rpc_message msg = {
 905                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
 906                 .rpc_argp = &calldata->arg,
 907                 .rpc_resp = &calldata->res,
 908                 .rpc_cred = state->owner->so_cred,
 909         };
 910         int mode = 0;
 911         int status;
 912
 913         status = nfs_wait_on_sequence(calldata->arg.seqid, task);
 914         if (status != 0)
 915                 return;
 916         /* Don't reorder reads */
 917         smp_rmb();
 918         /* Recalculate the new open mode in case someone reopened the file
 919          * while we were waiting in line to be scheduled.
 920          */
 921         if (state->nreaders != 0)
 922                 mode |= FMODE_READ;
 923         if (state->nwriters != 0)
 924                 mode |= FMODE_WRITE;
 925         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
 926                 state->state = mode;
 927         if (mode == state->state) {
 928                 nfs4_free_closedata(calldata);
 929                 task->tk_exit = NULL;
 930                 rpc_exit(task, 0);
 931                 return;
 932         }
 933         if (mode != 0)
 934                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
 935         calldata->arg.open_flags = mode;
 936         rpc_call_setup(task, &msg, 0);
 937 }
 938
 939 /*
 940  * It is possible for data to be read/written from a mem-mapped file
 941  * after the sys_close call (which hits the vfs layer as a flush).
 942  * This means that we can't safely call nfsv4 close on a file until
 943  * the inode is cleared. This in turn means that we are not good
 944  * NFSv4 citizens - we do not indicate to the server to update the file's
 945  * share state even when we are done with one of the three share
 946  * stateid's in the inode.
 947  *
 948  * NOTE: Caller must be holding the sp->so_owner semaphore!
 949  */
 950 int nfs4_do_close(struct inode *inode, struct nfs4_state *state, mode_t mode)
 951 {
 952         struct nfs4_closedata *calldata;
 953         int status = -ENOMEM;
 954
 955         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
 956         if (calldata == NULL)
 957                 goto out;
 958         calldata->inode = inode;
 959         calldata->state = state;
 960         calldata->arg.fh = NFS_FH(inode);
 961         calldata->arg.stateid = &state->stateid;
 962         /* Serialization for the sequence id */
 963         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
 964         if (calldata->arg.seqid == NULL)
 965                 goto out_free_calldata;
 966
 967         status = nfs4_call_async(NFS_SERVER(inode)->client, nfs4_close_begin,
 968                         nfs4_close_done, calldata);
 969         if (status == 0)
 970                 goto out;
 971
 972         nfs_free_seqid(calldata->arg.seqid);
 973 out_free_calldata:
 974         kfree(calldata);
 975 out:
 976         return status;
 977 }
 978
 979 static void nfs4_intent_set_file(struct nameidata *nd, struct dentry *dentry, struct nfs4_state *state)
 980 {
 981         struct file *filp;
 982
 983         filp = lookup_instantiate_filp(nd, dentry, NULL);
 984         if (!IS_ERR(filp)) {
 985                 struct nfs_open_context *ctx;
 986                 ctx = (struct nfs_open_context *)filp->private_data;
 987                 ctx->state = state;
 988         } else
 989                 nfs4_close_state(state, nd->intent.open.flags);
 990 }
 991
 992 struct dentry *
 993 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
 994 {
 995         struct iattr attr;
 996         struct rpc_cred *cred;
 997         struct nfs4_state *state;
 998         struct dentry *res;
 999
1000         if (nd->flags & LOOKUP_CREATE) {
1001                 attr.ia_mode = nd->intent.open.create_mode;
1002                 attr.ia_valid = ATTR_MODE;
1003                 if (!IS_POSIXACL(dir))
1004                         attr.ia_mode &= ~current->fs->umask;
1005         } else {
1006                 attr.ia_valid = 0;
1007                 BUG_ON(nd->intent.open.flags & O_CREAT);
1008         }
1009
1010         cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1011         if (IS_ERR(cred))
1012                 return (struct dentry *)cred;
1013         state = nfs4_do_open(dir, dentry, nd->intent.open.flags, &attr, cred);
1014         put_rpccred(cred);
1015         if (IS_ERR(state)) {
1016                 if (PTR_ERR(state) == -ENOENT)
1017                         d_add(dentry, NULL);
1018                 return (struct dentry *)state;
1019         }
1020         res = d_add_unique(dentry, state->inode);
1021         if (res != NULL)
1022                 dentry = res;
1023         nfs4_intent_set_file(nd, dentry, state);
1024         return res;
1025 }
1026
1027 int
1028 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1029 {
1030         struct rpc_cred *cred;
1031         struct nfs4_state *state;
1032         struct inode *inode;
1033
1034         cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1035         if (IS_ERR(cred))
1036                 return PTR_ERR(cred);
1037         state = nfs4_open_delegated(dentry->d_inode, openflags, cred);
1038         if (IS_ERR(state))
1039                 state = nfs4_do_open(dir, dentry, openflags, NULL, cred);
1040         put_rpccred(cred);
1041         if (IS_ERR(state)) {
1042                 switch (PTR_ERR(state)) {
1043                         case -EPERM:
1044                         case -EACCES:
1045                         case -EDQUOT:
1046                         case -ENOSPC:
1047                         case -EROFS:
1048                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1049                                 return 1;
1050                         case -ENOENT:
1051                                 if (dentry->d_inode == NULL)
1052                                         return 1;
1053                 }
1054                 goto out_drop;
1055         }
1056         inode = state->inode;
1057         iput(inode);
1058         if (inode == dentry->d_inode) {
1059                 nfs4_intent_set_file(nd, dentry, state);
1060                 return 1;
1061         }
1062         nfs4_close_state(state, openflags);
1063 out_drop:
1064         d_drop(dentry);
1065         return 0;
1066 }
1067
1068
1069 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1070 {
1071         struct nfs4_server_caps_res res = {};
1072         struct rpc_message msg = {
1073                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1074                 .rpc_argp = fhandle,
1075                 .rpc_resp = &res,
1076         };
1077         int status;
1078
1079         status = rpc_call_sync(server->client, &msg, 0);
1080         if (status == 0) {
1081                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1082                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1083                         server->caps |= NFS_CAP_ACLS;
1084                 if (res.has_links != 0)
1085                         server->caps |= NFS_CAP_HARDLINKS;
1086                 if (res.has_symlinks != 0)
1087                         server->caps |= NFS_CAP_SYMLINKS;
1088                 server->acl_bitmask = res.acl_bitmask;
1089         }
1090         return status;
1091 }
1092
1093 static int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1094 {
1095         struct nfs4_exception exception = { };
1096         int err;
1097         do {
1098                 err = nfs4_handle_exception(server,
1099                                 _nfs4_server_capabilities(server, fhandle),
1100                                 &exception);
1101         } while (exception.retry);
1102         return err;
1103 }
1104
1105 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1106                 struct nfs_fsinfo *info)
1107 {
1108         struct nfs4_lookup_root_arg args = {
1109                 .bitmask = nfs4_fattr_bitmap,
1110         };
1111         struct nfs4_lookup_res res = {
1112                 .server = server,
1113                 .fattr = info->fattr,
1114                 .fh = fhandle,
1115         };
1116         struct rpc_message msg = {
1117                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1118                 .rpc_argp = &args,
1119                 .rpc_resp = &res,
1120         };
1121         nfs_fattr_init(info->fattr);
1122         return rpc_call_sync(server->client, &msg, 0);
1123 }
1124
1125 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1126                 struct nfs_fsinfo *info)
1127 {
1128         struct nfs4_exception exception = { };
1129         int err;
1130         do {
1131                 err = nfs4_handle_exception(server,
1132                                 _nfs4_lookup_root(server, fhandle, info),
1133                                 &exception);
1134         } while (exception.retry);
1135         return err;
1136 }
1137
1138 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1139                 struct nfs_fsinfo *info)
1140 {
1141         struct nfs_fattr *      fattr = info->fattr;
1142         unsigned char *         p;
1143         struct qstr             q;
1144         struct nfs4_lookup_arg args = {
1145                 .dir_fh = fhandle,
1146                 .name = &q,
1147                 .bitmask = nfs4_fattr_bitmap,
1148         };
1149         struct nfs4_lookup_res res = {
1150                 .server = server,
1151                 .fattr = fattr,
1152                 .fh = fhandle,
1153         };
1154         struct rpc_message msg = {
1155                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1156                 .rpc_argp = &args,
1157                 .rpc_resp = &res,
1158         };
1159         int status;
1160
1161         /*
1162          * Now we do a separate LOOKUP for each component of the mount path.
1163          * The LOOKUPs are done separately so that we can conveniently
1164          * catch an ERR_WRONGSEC if it occurs along the way...
1165          */
1166         status = nfs4_lookup_root(server, fhandle, info);
1167         if (status)
1168                 goto out;
1169
1170         p = server->mnt_path;
1171         for (;;) {
1172                 struct nfs4_exception exception = { };
1173
1174                 while (*p == '/')
1175                         p++;
1176                 if (!*p)
1177                         break;
1178                 q.name = p;
1179                 while (*p && (*p != '/'))
1180                         p++;
1181                 q.len = p - q.name;
1182
1183                 do {
1184                         nfs_fattr_init(fattr);
1185                         status = nfs4_handle_exception(server,
1186                                         rpc_call_sync(server->client, &msg, 0),
1187                                         &exception);
1188                 } while (exception.retry);
1189                 if (status == 0)
1190                         continue;
1191                 if (status == -ENOENT) {
1192                         printk(KERN_NOTICE "NFS: mount path %s does not exist!\n", server->mnt_path);
1193                         printk(KERN_NOTICE "NFS: suggestion: try mounting '/' instead.\n");
1194                 }
1195                 break;
1196         }
1197         if (status == 0)
1198                 status = nfs4_server_capabilities(server, fhandle);
1199         if (status == 0)
1200                 status = nfs4_do_fsinfo(server, fhandle, info);
1201 out:
1202         return status;
1203 }
1204
1205 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1206 {
1207         struct nfs4_getattr_arg args = {
1208                 .fh = fhandle,
1209                 .bitmask = server->attr_bitmask,
1210         };
1211         struct nfs4_getattr_res res = {
1212                 .fattr = fattr,
1213                 .server = server,
1214         };
1215         struct rpc_message msg = {
1216                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1217                 .rpc_argp = &args,
1218                 .rpc_resp = &res,
1219         };
1220
1221         nfs_fattr_init(fattr);
1222         return rpc_call_sync(server->client, &msg, 0);
1223 }
1224
1225 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1226 {
1227         struct nfs4_exception exception = { };
1228         int err;
1229         do {
1230                 err = nfs4_handle_exception(server,
1231                                 _nfs4_proc_getattr(server, fhandle, fattr),
1232                                 &exception);
1233         } while (exception.retry);
1234         return err;
1235 }
1236
1237 /*
1238  * The file is not closed if it is opened due to the a request to change
1239  * the size of the file. The open call will not be needed once the
1240  * VFS layer lookup-intents are implemented.
1241  *
1242  * Close is called when the inode is destroyed.
1243  * If we haven't opened the file for O_WRONLY, we
1244  * need to in the size_change case to obtain a stateid.
1245  *
1246  * Got race?
1247  * Because OPEN is always done by name in nfsv4, it is
1248  * possible that we opened a different file by the same
1249  * name.  We can recognize this race condition, but we
1250  * can't do anything about it besides returning an error.
1251  *
1252  * This will be fixed with VFS changes (lookup-intent).
1253  */
1254 static int
1255 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1256                   struct iattr *sattr)
1257 {
1258         struct rpc_cred *cred;
1259         struct inode *inode = dentry->d_inode;
1260         struct nfs4_state *state;
1261         int status;
1262
1263         nfs_fattr_init(fattr);
1264
1265         cred = rpcauth_lookupcred(NFS_SERVER(inode)->client->cl_auth, 0);
1266         if (IS_ERR(cred))
1267                 return PTR_ERR(cred);
1268         /* Search for an existing WRITE delegation first */
1269         state = nfs4_open_delegated(inode, FMODE_WRITE, cred);
1270         if (!IS_ERR(state)) {
1271                 /* NB: nfs4_open_delegated() bumps the inode->i_count */
1272                 iput(inode);
1273         } else {
1274                 /* Search for an existing open(O_WRITE) stateid */
1275                 state = nfs4_find_state(inode, cred, FMODE_WRITE);
1276         }
1277
1278         status = nfs4_do_setattr(NFS_SERVER(inode), fattr,
1279                         NFS_FH(inode), sattr, state);
1280         if (status == 0)
1281                 nfs_setattr_update_inode(inode, sattr);
1282         if (state != NULL)
1283                 nfs4_close_state(state, FMODE_WRITE);
1284         put_rpccred(cred);
1285         return status;
1286 }
1287
1288 static int _nfs4_proc_lookup(struct inode *dir, struct qstr *name,
1289                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1290 {
1291         int                    status;
1292         struct nfs_server *server = NFS_SERVER(dir);
1293         struct nfs4_lookup_arg args = {
1294                 .bitmask = server->attr_bitmask,
1295                 .dir_fh = NFS_FH(dir),
1296                 .name = name,
1297         };
1298         struct nfs4_lookup_res res = {
1299                 .server = server,
1300                 .fattr = fattr,
1301                 .fh = fhandle,
1302         };
1303         struct rpc_message msg = {
1304                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1305                 .rpc_argp = &args,
1306                 .rpc_resp = &res,
1307         };
1308
1309         nfs_fattr_init(fattr);
1310
1311         dprintk("NFS call  lookup %s\n", name->name);
1312         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1313         dprintk("NFS reply lookup: %d\n", status);
1314         return status;
1315 }
1316
1317 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1318 {
1319         struct nfs4_exception exception = { };
1320         int err;
1321         do {
1322                 err = nfs4_handle_exception(NFS_SERVER(dir),
1323                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1324                                 &exception);
1325         } while (exception.retry);
1326         return err;
1327 }
1328
1329 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1330 {
1331         struct nfs4_accessargs args = {
1332                 .fh = NFS_FH(inode),
1333         };
1334         struct nfs4_accessres res = { 0 };
1335         struct rpc_message msg = {
1336                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1337                 .rpc_argp = &args,
1338                 .rpc_resp = &res,
1339                 .rpc_cred = entry->cred,
1340         };
1341         int mode = entry->mask;
1342         int status;
1343
1344         /*
1345          * Determine which access bits we want to ask for...
1346          */
1347         if (mode & MAY_READ)
1348                 args.access |= NFS4_ACCESS_READ;
1349         if (S_ISDIR(inode->i_mode)) {
1350                 if (mode & MAY_WRITE)
1351                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1352                 if (mode & MAY_EXEC)
1353                         args.access |= NFS4_ACCESS_LOOKUP;
1354         } else {
1355                 if (mode & MAY_WRITE)
1356                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1357                 if (mode & MAY_EXEC)
1358                         args.access |= NFS4_ACCESS_EXECUTE;
1359         }
1360         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1361         if (!status) {
1362                 entry->mask = 0;
1363                 if (res.access & NFS4_ACCESS_READ)
1364                         entry->mask |= MAY_READ;
1365                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1366                         entry->mask |= MAY_WRITE;
1367                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1368                         entry->mask |= MAY_EXEC;
1369         }
1370         return status;
1371 }
1372
1373 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1374 {
1375         struct nfs4_exception exception = { };
1376         int err;
1377         do {
1378                 err = nfs4_handle_exception(NFS_SERVER(inode),
1379                                 _nfs4_proc_access(inode, entry),
1380                                 &exception);
1381         } while (exception.retry);
1382         return err;
1383 }
1384
1385 /*
1386  * TODO: For the time being, we don't try to get any attributes
1387  * along with any of the zero-copy operations READ, READDIR,
1388  * READLINK, WRITE.
1389  *
1390  * In the case of the first three, we want to put the GETATTR
1391  * after the read-type operation -- this is because it is hard
1392  * to predict the length of a GETATTR response in v4, and thus
1393  * align the READ data correctly.  This means that the GETATTR
1394  * may end up partially falling into the page cache, and we should
1395  * shift it into the 'tail' of the xdr_buf before processing.
1396  * To do this efficiently, we need to know the total length
1397  * of data received, which doesn't seem to be available outside
1398  * of the RPC layer.
1399  *
1400  * In the case of WRITE, we also want to put the GETATTR after
1401  * the operation -- in this case because we want to make sure
1402  * we get the post-operation mtime and size.  This means that
1403  * we can't use xdr_encode_pages() as written: we need a variant
1404  * of it which would leave room in the 'tail' iovec.
1405  *
1406  * Both of these changes to the XDR layer would in fact be quite
1407  * minor, but I decided to leave them for a subsequent patch.
1408  */
1409 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1410                 unsigned int pgbase, unsigned int pglen)
1411 {
1412         struct nfs4_readlink args = {
1413                 .fh       = NFS_FH(inode),
1414                 .pgbase   = pgbase,
1415                 .pglen    = pglen,
1416                 .pages    = &page,
1417         };
1418         struct rpc_message msg = {
1419                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1420                 .rpc_argp = &args,
1421                 .rpc_resp = NULL,
1422         };
1423
1424         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1425 }
1426
1427 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1428                 unsigned int pgbase, unsigned int pglen)
1429 {
1430         struct nfs4_exception exception = { };
1431         int err;
1432         do {
1433                 err = nfs4_handle_exception(NFS_SERVER(inode),
1434                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1435                                 &exception);
1436         } while (exception.retry);
1437         return err;
1438 }
1439
1440 static int _nfs4_proc_read(struct nfs_read_data *rdata)
1441 {
1442         int flags = rdata->flags;
1443         struct inode *inode = rdata->inode;
1444         struct nfs_fattr *fattr = rdata->res.fattr;
1445         struct nfs_server *server = NFS_SERVER(inode);
1446         struct rpc_message msg = {
1447                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_READ],
1448                 .rpc_argp       = &rdata->args,
1449                 .rpc_resp       = &rdata->res,
1450                 .rpc_cred       = rdata->cred,
1451         };
1452         unsigned long timestamp = jiffies;
1453         int status;
1454
1455         dprintk("NFS call  read %d @ %Ld\n", rdata->args.count,
1456                         (long long) rdata->args.offset);
1457
1458         nfs_fattr_init(fattr);
1459         status = rpc_call_sync(server->client, &msg, flags);
1460         if (!status)
1461                 renew_lease(server, timestamp);
1462         dprintk("NFS reply read: %d\n", status);
1463         return status;
1464 }
1465
1466 static int nfs4_proc_read(struct nfs_read_data *rdata)
1467 {
1468         struct nfs4_exception exception = { };
1469         int err;
1470         do {
1471                 err = nfs4_handle_exception(NFS_SERVER(rdata->inode),
1472                                 _nfs4_proc_read(rdata),
1473                                 &exception);
1474         } while (exception.retry);
1475         return err;
1476 }
1477
1478 static int _nfs4_proc_write(struct nfs_write_data *wdata)
1479 {
1480         int rpcflags = wdata->flags;
1481         struct inode *inode = wdata->inode;
1482         struct nfs_fattr *fattr = wdata->res.fattr;
1483         struct nfs_server *server = NFS_SERVER(inode);
1484         struct rpc_message msg = {
1485                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
1486                 .rpc_argp       = &wdata->args,
1487                 .rpc_resp       = &wdata->res,
1488                 .rpc_cred       = wdata->cred,
1489         };
1490         int status;
1491
1492         dprintk("NFS call  write %d @ %Ld\n", wdata->args.count,
1493                         (long long) wdata->args.offset);
1494
1495         nfs_fattr_init(fattr);
1496         status = rpc_call_sync(server->client, &msg, rpcflags);
1497         dprintk("NFS reply write: %d\n", status);
1498         return status;
1499 }
1500
1501 static int nfs4_proc_write(struct nfs_write_data *wdata)
1502 {
1503         struct nfs4_exception exception = { };
1504         int err;
1505         do {
1506                 err = nfs4_handle_exception(NFS_SERVER(wdata->inode),
1507                                 _nfs4_proc_write(wdata),
1508                                 &exception);
1509         } while (exception.retry);
1510         return err;
1511 }
1512
1513 static int _nfs4_proc_commit(struct nfs_write_data *cdata)
1514 {
1515         struct inode *inode = cdata->inode;
1516         struct nfs_fattr *fattr = cdata->res.fattr;
1517         struct nfs_server *server = NFS_SERVER(inode);
1518         struct rpc_message msg = {
1519                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
1520                 .rpc_argp       = &cdata->args,
1521                 .rpc_resp       = &cdata->res,
1522                 .rpc_cred       = cdata->cred,
1523         };
1524         int status;
1525
1526         dprintk("NFS call  commit %d @ %Ld\n", cdata->args.count,
1527                         (long long) cdata->args.offset);
1528
1529         nfs_fattr_init(fattr);
1530         status = rpc_call_sync(server->client, &msg, 0);
1531         dprintk("NFS reply commit: %d\n", status);
1532         return status;
1533 }
1534
1535 static int nfs4_proc_commit(struct nfs_write_data *cdata)
1536 {
1537         struct nfs4_exception exception = { };
1538         int err;
1539         do {
1540                 err = nfs4_handle_exception(NFS_SERVER(cdata->inode),
1541                                 _nfs4_proc_commit(cdata),
1542                                 &exception);
1543         } while (exception.retry);
1544         return err;
1545 }
1546
1547 /*
1548  * Got race?
1549  * We will need to arrange for the VFS layer to provide an atomic open.
1550  * Until then, this create/open method is prone to inefficiency and race
1551  * conditions due to the lookup, create, and open VFS calls from sys_open()
1552  * placed on the wire.
1553  *
1554  * Given the above sorry state of affairs, I'm simply sending an OPEN.
1555  * The file will be opened again in the subsequent VFS open call
1556  * (nfs4_proc_file_open).
1557  *
1558  * The open for read will just hang around to be used by any process that
1559  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1560  */
1561
1562 static int
1563 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
1564                  int flags, struct nameidata *nd)
1565 {
1566         struct nfs4_state *state;
1567         struct rpc_cred *cred;
1568         int status = 0;
1569
1570         cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1571         if (IS_ERR(cred)) {
1572                 status = PTR_ERR(cred);
1573                 goto out;
1574         }
1575         state = nfs4_do_open(dir, dentry, flags, sattr, cred);
1576         put_rpccred(cred);
1577         if (IS_ERR(state)) {
1578                 status = PTR_ERR(state);
1579                 goto out;
1580         }
1581         d_instantiate(dentry, state->inode);
1582         if (flags & O_EXCL) {
1583                 struct nfs_fattr fattr;
1584                 status = nfs4_do_setattr(NFS_SERVER(dir), &fattr,
1585                                      NFS_FH(state->inode), sattr, state);
1586                 if (status == 0)
1587                         nfs_setattr_update_inode(state->inode, sattr);
1588         }
1589         if (status == 0 && nd != NULL && (nd->flags & LOOKUP_OPEN))
1590                 nfs4_intent_set_file(nd, dentry, state);
1591         else
1592                 nfs4_close_state(state, flags);
1593 out:
1594         return status;
1595 }
1596
1597 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1598 {
1599         struct nfs4_remove_arg args = {
1600                 .fh = NFS_FH(dir),
1601                 .name = name,
1602         };
1603         struct nfs4_change_info res;
1604         struct rpc_message msg = {
1605                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1606                 .rpc_argp       = &args,
1607                 .rpc_resp       = &res,
1608         };
1609         int                     status;
1610
1611         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1612         if (status == 0)
1613                 update_changeattr(dir, &res);
1614         return status;
1615 }
1616
1617 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1618 {
1619         struct nfs4_exception exception = { };
1620         int err;
1621         do {
1622                 err = nfs4_handle_exception(NFS_SERVER(dir),
1623                                 _nfs4_proc_remove(dir, name),
1624                                 &exception);
1625         } while (exception.retry);
1626         return err;
1627 }
1628
1629 struct unlink_desc {
1630         struct nfs4_remove_arg  args;
1631         struct nfs4_change_info res;
1632 };
1633
1634 static int nfs4_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir,
1635                 struct qstr *name)
1636 {
1637         struct unlink_desc *up;
1638
1639         up = (struct unlink_desc *) kmalloc(sizeof(*up), GFP_KERNEL);
1640         if (!up)
1641                 return -ENOMEM;
1642
1643         up->args.fh = NFS_FH(dir->d_inode);
1644         up->args.name = name;
1645
1646         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1647         msg->rpc_argp = &up->args;
1648         msg->rpc_resp = &up->res;
1649         return 0;
1650 }
1651
1652 static int nfs4_proc_unlink_done(struct dentry *dir, struct rpc_task *task)
1653 {
1654         struct rpc_message *msg = &task->tk_msg;
1655         struct unlink_desc *up;
1656
1657         if (msg->rpc_resp != NULL) {
1658                 up = container_of(msg->rpc_resp, struct unlink_desc, res);
1659                 update_changeattr(dir->d_inode, &up->res);
1660                 kfree(up);
1661                 msg->rpc_resp = NULL;
1662                 msg->rpc_argp = NULL;
1663         }
1664         return 0;
1665 }
1666
1667 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1668                 struct inode *new_dir, struct qstr *new_name)
1669 {
1670         struct nfs4_rename_arg arg = {
1671                 .old_dir = NFS_FH(old_dir),
1672                 .new_dir = NFS_FH(new_dir),
1673                 .old_name = old_name,
1674                 .new_name = new_name,
1675         };
1676         struct nfs4_rename_res res = { };
1677         struct rpc_message msg = {
1678                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
1679                 .rpc_argp = &arg,
1680                 .rpc_resp = &res,
1681         };
1682         int                     status;
1683
1684         status = rpc_call_sync(NFS_CLIENT(old_dir), &msg, 0);
1685
1686         if (!status) {
1687                 update_changeattr(old_dir, &res.old_cinfo);
1688                 update_changeattr(new_dir, &res.new_cinfo);
1689         }
1690         return status;
1691 }
1692
1693 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1694                 struct inode *new_dir, struct qstr *new_name)
1695 {
1696         struct nfs4_exception exception = { };
1697         int err;
1698         do {
1699                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
1700                                 _nfs4_proc_rename(old_dir, old_name,
1701                                         new_dir, new_name),
1702                                 &exception);
1703         } while (exception.retry);
1704         return err;
1705 }
1706
1707 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
1708 {
1709         struct nfs4_link_arg arg = {
1710                 .fh     = NFS_FH(inode),
1711                 .dir_fh = NFS_FH(dir),
1712                 .name   = name,
1713         };
1714         struct nfs4_change_info cinfo = { };
1715         struct rpc_message msg = {
1716                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
1717                 .rpc_argp = &arg,
1718                 .rpc_resp = &cinfo,
1719         };
1720         int                     status;
1721
1722         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1723         if (!status)
1724                 update_changeattr(dir, &cinfo);
1725
1726         return status;
1727 }
1728
1729 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
1730 {
1731         struct nfs4_exception exception = { };
1732         int err;
1733         do {
1734                 err = nfs4_handle_exception(NFS_SERVER(inode),
1735                                 _nfs4_proc_link(inode, dir, name),
1736                                 &exception);
1737         } while (exception.retry);
1738         return err;
1739 }
1740
1741 static int _nfs4_proc_symlink(struct inode *dir, struct qstr *name,
1742                 struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle,
1743                 struct nfs_fattr *fattr)
1744 {
1745         struct nfs_server *server = NFS_SERVER(dir);
1746         struct nfs4_create_arg arg = {
1747                 .dir_fh = NFS_FH(dir),
1748                 .server = server,
1749                 .name = name,
1750                 .attrs = sattr,
1751                 .ftype = NF4LNK,
1752                 .bitmask = server->attr_bitmask,
1753         };
1754         struct nfs4_create_res res = {
1755                 .server = server,
1756                 .fh = fhandle,
1757                 .fattr = fattr,
1758         };
1759         struct rpc_message msg = {
1760                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
1761                 .rpc_argp = &arg,
1762                 .rpc_resp = &res,
1763         };
1764         int                     status;
1765
1766         if (path->len > NFS4_MAXPATHLEN)
1767                 return -ENAMETOOLONG;
1768         arg.u.symlink = path;
1769         nfs_fattr_init(fattr);
1770
1771         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1772         if (!status)
1773                 update_changeattr(dir, &res.dir_cinfo);
1774         return status;
1775 }
1776
1777 static int nfs4_proc_symlink(struct inode *dir, struct qstr *name,
1778                 struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle,
1779                 struct nfs_fattr *fattr)
1780 {
1781         struct nfs4_exception exception = { };
1782         int err;
1783         do {
1784                 err = nfs4_handle_exception(NFS_SERVER(dir),
1785                                 _nfs4_proc_symlink(dir, name, path, sattr,
1786                                         fhandle, fattr),
1787                                 &exception);
1788         } while (exception.retry);
1789         return err;
1790 }
1791
1792 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
1793                 struct iattr *sattr)
1794 {
1795         struct nfs_server *server = NFS_SERVER(dir);
1796         struct nfs_fh fhandle;
1797         struct nfs_fattr fattr;
1798         struct nfs4_create_arg arg = {
1799                 .dir_fh = NFS_FH(dir),
1800                 .server = server,
1801                 .name = &dentry->d_name,
1802                 .attrs = sattr,
1803                 .ftype = NF4DIR,
1804                 .bitmask = server->attr_bitmask,
1805         };
1806         struct nfs4_create_res res = {
1807                 .server = server,
1808                 .fh = &fhandle,
1809                 .fattr = &fattr,
1810         };
1811         struct rpc_message msg = {
1812                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
1813                 .rpc_argp = &arg,
1814                 .rpc_resp = &res,
1815         };
1816         int                     status;
1817
1818         nfs_fattr_init(&fattr);
1819
1820         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1821         if (!status) {
1822                 update_changeattr(dir, &res.dir_cinfo);
1823                 status = nfs_instantiate(dentry, &fhandle, &fattr);
1824         }
1825         return status;
1826 }
1827
1828 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
1829                 struct iattr *sattr)
1830 {
1831         struct nfs4_exception exception = { };
1832         int err;
1833         do {
1834                 err = nfs4_handle_exception(NFS_SERVER(dir),
1835                                 _nfs4_proc_mkdir(dir, dentry, sattr),
1836                                 &exception);
1837         } while (exception.retry);
1838         return err;
1839 }
1840
1841 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
1842                   u64 cookie, struct page *page, unsigned int count, int plus)
1843 {
1844         struct inode            *dir = dentry->d_inode;
1845         struct nfs4_readdir_arg args = {
1846                 .fh = NFS_FH(dir),
1847                 .pages = &page,
1848                 .pgbase = 0,
1849                 .count = count,
1850                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
1851         };
1852         struct nfs4_readdir_res res;
1853         struct rpc_message msg = {
1854                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
1855                 .rpc_argp = &args,
1856                 .rpc_resp = &res,
1857                 .rpc_cred = cred,
1858         };
1859         int                     status;
1860
1861         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
1862                         dentry->d_parent->d_name.name,
1863                         dentry->d_name.name,
1864                         (unsigned long long)cookie);
1865         lock_kernel();
1866         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
1867         res.pgbase = args.pgbase;
1868         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1869         if (status == 0)
1870                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
1871         unlock_kernel();
1872         dprintk("%s: returns %d\n", __FUNCTION__, status);
1873         return status;
1874 }
1875
1876 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
1877                   u64 cookie, struct page *page, unsigned int count, int plus)
1878 {
1879         struct nfs4_exception exception = { };
1880         int err;
1881         do {
1882                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
1883                                 _nfs4_proc_readdir(dentry, cred, cookie,
1884                                         page, count, plus),
1885                                 &exception);
1886         } while (exception.retry);
1887         return err;
1888 }
1889
1890 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
1891                 struct iattr *sattr, dev_t rdev)
1892 {
1893         struct nfs_server *server = NFS_SERVER(dir);
1894         struct nfs_fh fh;
1895         struct nfs_fattr fattr;
1896         struct nfs4_create_arg arg = {
1897                 .dir_fh = NFS_FH(dir),
1898                 .server = server,
1899                 .name = &dentry->d_name,
1900                 .attrs = sattr,
1901                 .bitmask = server->attr_bitmask,
1902         };
1903         struct nfs4_create_res res = {
1904                 .server = server,
1905                 .fh = &fh,
1906                 .fattr = &fattr,
1907         };
1908         struct rpc_message msg = {
1909                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
1910                 .rpc_argp = &arg,
1911                 .rpc_resp = &res,
1912         };
1913         int                     status;
1914         int                     mode = sattr->ia_mode;
1915
1916         nfs_fattr_init(&fattr);
1917
1918         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
1919         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
1920         if (S_ISFIFO(mode))
1921                 arg.ftype = NF4FIFO;
1922         else if (S_ISBLK(mode)) {
1923                 arg.ftype = NF4BLK;
1924                 arg.u.device.specdata1 = MAJOR(rdev);
1925                 arg.u.device.specdata2 = MINOR(rdev);
1926         }
1927         else if (S_ISCHR(mode)) {
1928                 arg.ftype = NF4CHR;
1929                 arg.u.device.specdata1 = MAJOR(rdev);
1930                 arg.u.device.specdata2 = MINOR(rdev);
1931         }
1932         else
1933                 arg.ftype = NF4SOCK;
1934
1935         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1936         if (status == 0) {
1937                 update_changeattr(dir, &res.dir_cinfo);
1938                 status = nfs_instantiate(dentry, &fh, &fattr);
1939         }
1940         return status;
1941 }
1942
1943 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
1944                 struct iattr *sattr, dev_t rdev)
1945 {
1946         struct nfs4_exception exception = { };
1947         int err;
1948         do {
1949                 err = nfs4_handle_exception(NFS_SERVER(dir),
1950                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
1951                                 &exception);
1952         } while (exception.retry);
1953         return err;
1954 }
1955
1956 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
1957                  struct nfs_fsstat *fsstat)
1958 {
1959         struct nfs4_statfs_arg args = {
1960                 .fh = fhandle,
1961                 .bitmask = server->attr_bitmask,
1962         };
1963         struct rpc_message msg = {
1964                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
1965                 .rpc_argp = &args,
1966                 .rpc_resp = fsstat,
1967         };
1968
1969         nfs_fattr_init(fsstat->fattr);
1970         return rpc_call_sync(server->client, &msg, 0);
1971 }
1972
1973 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
1974 {
1975         struct nfs4_exception exception = { };
1976         int err;
1977         do {
1978                 err = nfs4_handle_exception(server,
1979                                 _nfs4_proc_statfs(server, fhandle, fsstat),
1980                                 &exception);
1981         } while (exception.retry);
1982         return err;
1983 }
1984
1985 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
1986                 struct nfs_fsinfo *fsinfo)
1987 {
1988         struct nfs4_fsinfo_arg args = {
1989                 .fh = fhandle,
1990                 .bitmask = server->attr_bitmask,
1991         };
1992         struct rpc_message msg = {
1993                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
1994                 .rpc_argp = &args,
1995                 .rpc_resp = fsinfo,
1996         };
1997
1998         return rpc_call_sync(server->client, &msg, 0);
1999 }
2000
2001 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2002 {
2003         struct nfs4_exception exception = { };
2004         int err;
2005
2006         do {
2007                 err = nfs4_handle_exception(server,
2008                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2009                                 &exception);
2010         } while (exception.retry);
2011         return err;
2012 }
2013
2014 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2015 {
2016         nfs_fattr_init(fsinfo->fattr);
2017         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2018 }
2019
2020 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2021                 struct nfs_pathconf *pathconf)
2022 {
2023         struct nfs4_pathconf_arg args = {
2024                 .fh = fhandle,
2025                 .bitmask = server->attr_bitmask,
2026         };
2027         struct rpc_message msg = {
2028                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2029                 .rpc_argp = &args,
2030                 .rpc_resp = pathconf,
2031         };
2032
2033         /* None of the pathconf attributes are mandatory to implement */
2034         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2035                 memset(pathconf, 0, sizeof(*pathconf));
2036                 return 0;
2037         }
2038
2039         nfs_fattr_init(pathconf->fattr);
2040         return rpc_call_sync(server->client, &msg, 0);
2041 }
2042
2043 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2044                 struct nfs_pathconf *pathconf)
2045 {
2046         struct nfs4_exception exception = { };
2047         int err;
2048
2049         do {
2050                 err = nfs4_handle_exception(server,
2051                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2052                                 &exception);
2053         } while (exception.retry);
2054         return err;
2055 }
2056
2057 static void
2058 nfs4_read_done(struct rpc_task *task)
2059 {
2060         struct nfs_read_data *data = (struct nfs_read_data *) task->tk_calldata;
2061         struct inode *inode = data->inode;
2062
2063         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2064                 rpc_restart_call(task);
2065                 return;
2066         }
2067         if (task->tk_status > 0)
2068                 renew_lease(NFS_SERVER(inode), data->timestamp);
2069         /* Call back common NFS readpage processing */
2070         nfs_readpage_result(task);
2071 }
2072
2073 static void
2074 nfs4_proc_read_setup(struct nfs_read_data *data)
2075 {
2076         struct rpc_task *task = &data->task;
2077         struct rpc_message msg = {
2078                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
2079                 .rpc_argp = &data->args,
2080                 .rpc_resp = &data->res,
2081                 .rpc_cred = data->cred,
2082         };
2083         struct inode *inode = data->inode;
2084         int flags;
2085
2086         data->timestamp   = jiffies;
2087
2088         /* N.B. Do we need to test? Never called for swapfile inode */
2089         flags = RPC_TASK_ASYNC | (IS_SWAPFILE(inode)? NFS_RPC_SWAPFLAGS : 0);
2090
2091         /* Finalize the task. */
2092         rpc_init_task(task, NFS_CLIENT(inode), nfs4_read_done, flags);
2093         rpc_call_setup(task, &msg, 0);
2094 }
2095
2096 static void
2097 nfs4_write_done(struct rpc_task *task)
2098 {
2099         struct nfs_write_data *data = (struct nfs_write_data *) task->tk_calldata;
2100         struct inode *inode = data->inode;
2101
2102         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2103                 rpc_restart_call(task);
2104                 return;
2105         }
2106         if (task->tk_status >= 0)
2107                 renew_lease(NFS_SERVER(inode), data->timestamp);
2108         /* Call back common NFS writeback processing */
2109         nfs_writeback_done(task);
2110 }
2111
2112 static void
2113 nfs4_proc_write_setup(struct nfs_write_data *data, int how)
2114 {
2115         struct rpc_task *task = &data->task;
2116         struct rpc_message msg = {
2117                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
2118                 .rpc_argp = &data->args,
2119                 .rpc_resp = &data->res,
2120                 .rpc_cred = data->cred,
2121         };
2122         struct inode *inode = data->inode;
2123         int stable;
2124         int flags;
2125
2126         if (how & FLUSH_STABLE) {
2127                 if (!NFS_I(inode)->ncommit)
2128                         stable = NFS_FILE_SYNC;
2129                 else
2130                         stable = NFS_DATA_SYNC;
2131         } else
2132                 stable = NFS_UNSTABLE;
2133         data->args.stable = stable;
2134
2135         data->timestamp   = jiffies;
2136
2137         /* Set the initial flags for the task.  */
2138         flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
2139
2140         /* Finalize the task. */
2141         rpc_init_task(task, NFS_CLIENT(inode), nfs4_write_done, flags);
2142         rpc_call_setup(task, &msg, 0);
2143 }
2144
2145 static void
2146 nfs4_commit_done(struct rpc_task *task)
2147 {
2148         struct nfs_write_data *data = (struct nfs_write_data *) task->tk_calldata;
2149         struct inode *inode = data->inode;
2150
2151         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2152                 rpc_restart_call(task);
2153                 return;
2154         }
2155         /* Call back common NFS writeback processing */
2156         nfs_commit_done(task);
2157 }
2158
2159 static void
2160 nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
2161 {
2162         struct rpc_task *task = &data->task;
2163         struct rpc_message msg = {
2164                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2165                 .rpc_argp = &data->args,
2166                 .rpc_resp = &data->res,
2167                 .rpc_cred = data->cred,
2168         };
2169         struct inode *inode = data->inode;
2170         int flags;
2171
2172         /* Set the initial flags for the task.  */
2173         flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
2174
2175         /* Finalize the task. */
2176         rpc_init_task(task, NFS_CLIENT(inode), nfs4_commit_done, flags);
2177         rpc_call_setup(task, &msg, 0);
2178 }
2179
2180 /*
2181  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2182  * standalone procedure for queueing an asynchronous RENEW.
2183  */
2184 static void
2185 renew_done(struct rpc_task *task)
2186 {
2187         struct nfs4_client *clp = (struct nfs4_client *)task->tk_msg.rpc_argp;
2188         unsigned long timestamp = (unsigned long)task->tk_calldata;
2189
2190         if (task->tk_status < 0) {
2191                 switch (task->tk_status) {
2192                         case -NFS4ERR_STALE_CLIENTID:
2193                         case -NFS4ERR_EXPIRED:
2194                         case -NFS4ERR_CB_PATH_DOWN:
2195                                 nfs4_schedule_state_recovery(clp);
2196                 }
2197                 return;
2198         }
2199         spin_lock(&clp->cl_lock);
2200         if (time_before(clp->cl_last_renewal,timestamp))
2201                 clp->cl_last_renewal = timestamp;
2202         spin_unlock(&clp->cl_lock);
2203 }
2204
2205 int
2206 nfs4_proc_async_renew(struct nfs4_client *clp)
2207 {
2208         struct rpc_message msg = {
2209                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2210                 .rpc_argp       = clp,
2211                 .rpc_cred       = clp->cl_cred,
2212         };
2213
2214         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2215                         renew_done, (void *)jiffies);
2216 }
2217
2218 int
2219 nfs4_proc_renew(struct nfs4_client *clp)
2220 {
2221         struct rpc_message msg = {
2222                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2223                 .rpc_argp       = clp,
2224                 .rpc_cred       = clp->cl_cred,
2225         };
2226         unsigned long now = jiffies;
2227         int status;
2228
2229         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2230         if (status < 0)
2231                 return status;
2232         spin_lock(&clp->cl_lock);
2233         if (time_before(clp->cl_last_renewal,now))
2234                 clp->cl_last_renewal = now;
2235         spin_unlock(&clp->cl_lock);
2236         return 0;
2237 }
2238
2239 static inline int nfs4_server_supports_acls(struct nfs_server *server)
2240 {
2241         return (server->caps & NFS_CAP_ACLS)
2242                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2243                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2244 }
2245
2246 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2247  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2248  * the stack.
2249  */
2250 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2251
2252 static void buf_to_pages(const void *buf, size_t buflen,
2253                 struct page **pages, unsigned int *pgbase)
2254 {
2255         const void *p = buf;
2256
2257         *pgbase = offset_in_page(buf);
2258         p -= *pgbase;
2259         while (p < buf + buflen) {
2260                 *(pages++) = virt_to_page(p);
2261                 p += PAGE_CACHE_SIZE;
2262         }
2263 }
2264
2265 struct nfs4_cached_acl {
2266         int cached;
2267         size_t len;
2268         char data[0];
2269 };
2270
2271 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2272 {
2273         struct nfs_inode *nfsi = NFS_I(inode);
2274
2275         spin_lock(&inode->i_lock);
2276         kfree(nfsi->nfs4_acl);
2277         nfsi->nfs4_acl = acl;
2278         spin_unlock(&inode->i_lock);
2279 }
2280
2281 static void nfs4_zap_acl_attr(struct inode *inode)
2282 {
2283         nfs4_set_cached_acl(inode, NULL);
2284 }
2285
2286 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2287 {
2288         struct nfs_inode *nfsi = NFS_I(inode);
2289         struct nfs4_cached_acl *acl;
2290         int ret = -ENOENT;
2291
2292         spin_lock(&inode->i_lock);
2293         acl = nfsi->nfs4_acl;
2294         if (acl == NULL)
2295                 goto out;
2296         if (buf == NULL) /* user is just asking for length */
2297                 goto out_len;
2298         if (acl->cached == 0)
2299                 goto out;
2300         ret = -ERANGE; /* see getxattr(2) man page */
2301         if (acl->len > buflen)
2302                 goto out;
2303         memcpy(buf, acl->data, acl->len);
2304 out_len:
2305         ret = acl->len;
2306 out:
2307         spin_unlock(&inode->i_lock);
2308         return ret;
2309 }
2310
2311 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2312 {
2313         struct nfs4_cached_acl *acl;
2314
2315         if (buf && acl_len <= PAGE_SIZE) {
2316                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2317                 if (acl == NULL)
2318                         goto out;
2319                 acl->cached = 1;
2320                 memcpy(acl->data, buf, acl_len);
2321         } else {
2322                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2323                 if (acl == NULL)
2324                         goto out;
2325                 acl->cached = 0;
2326         }
2327         acl->len = acl_len;
2328 out:
2329         nfs4_set_cached_acl(inode, acl);
2330 }
2331
2332 static inline ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2333 {
2334         struct page *pages[NFS4ACL_MAXPAGES];
2335         struct nfs_getaclargs args = {
2336                 .fh = NFS_FH(inode),
2337                 .acl_pages = pages,
2338                 .acl_len = buflen,
2339         };
2340         size_t resp_len = buflen;
2341         void *resp_buf;
2342         struct rpc_message msg = {
2343                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2344                 .rpc_argp = &args,
2345                 .rpc_resp = &resp_len,
2346         };
2347         struct page *localpage = NULL;
2348         int ret;
2349
2350         if (buflen < PAGE_SIZE) {
2351                 /* As long as we're doing a round trip to the server anyway,
2352                  * let's be prepared for a page of acl data. */
2353                 localpage = alloc_page(GFP_KERNEL);
2354                 resp_buf = page_address(localpage);
2355                 if (localpage == NULL)
2356                         return -ENOMEM;
2357                 args.acl_pages[0] = localpage;
2358                 args.acl_pgbase = 0;
2359                 resp_len = args.acl_len = PAGE_SIZE;
2360         } else {
2361                 resp_buf = buf;
2362                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2363         }
2364         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2365         if (ret)
2366                 goto out_free;
2367         if (resp_len > args.acl_len)
2368                 nfs4_write_cached_acl(inode, NULL, resp_len);
2369         else
2370                 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2371         if (buf) {
2372                 ret = -ERANGE;
2373                 if (resp_len > buflen)
2374                         goto out_free;
2375                 if (localpage)
2376                         memcpy(buf, resp_buf, resp_len);
2377         }
2378         ret = resp_len;
2379 out_free:
2380         if (localpage)
2381                 __free_page(localpage);
2382         return ret;
2383 }
2384
2385 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2386 {
2387         struct nfs_server *server = NFS_SERVER(inode);
2388         int ret;
2389
2390         if (!nfs4_server_supports_acls(server))
2391                 return -EOPNOTSUPP;
2392         ret = nfs_revalidate_inode(server, inode);
2393         if (ret < 0)
2394                 return ret;
2395         ret = nfs4_read_cached_acl(inode, buf, buflen);
2396         if (ret != -ENOENT)
2397                 return ret;
2398         return nfs4_get_acl_uncached(inode, buf, buflen);
2399 }
2400
2401 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2402 {
2403         struct nfs_server *server = NFS_SERVER(inode);
2404         struct page *pages[NFS4ACL_MAXPAGES];
2405         struct nfs_setaclargs arg = {
2406                 .fh             = NFS_FH(inode),
2407                 .acl_pages      = pages,
2408                 .acl_len        = buflen,
2409         };
2410         struct rpc_message msg = {
2411                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2412                 .rpc_argp       = &arg,
2413                 .rpc_resp       = NULL,
2414         };
2415         int ret;
2416
2417         if (!nfs4_server_supports_acls(server))
2418                 return -EOPNOTSUPP;
2419         nfs_inode_return_delegation(inode);
2420         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2421         ret = rpc_call_sync(NFS_SERVER(inode)->client, &msg, 0);
2422         if (ret == 0)
2423                 nfs4_write_cached_acl(inode, buf, buflen);
2424         return ret;
2425 }
2426
2427 static int
2428 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
2429 {
2430         struct nfs4_client *clp = server->nfs4_state;
2431
2432         if (!clp || task->tk_status >= 0)
2433                 return 0;
2434         switch(task->tk_status) {
2435                 case -NFS4ERR_STALE_CLIENTID:
2436                 case -NFS4ERR_STALE_STATEID:
2437                 case -NFS4ERR_EXPIRED:
2438                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2439                         nfs4_schedule_state_recovery(clp);
2440                         if (test_bit(NFS4CLNT_OK, &clp->cl_state))
2441                                 rpc_wake_up_task(task);
2442                         task->tk_status = 0;
2443                         return -EAGAIN;
2444                 case -NFS4ERR_GRACE:
2445                 case -NFS4ERR_DELAY:
2446                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
2447                         task->tk_status = 0;
2448                         return -EAGAIN;
2449                 case -NFS4ERR_OLD_STATEID:
2450                         task->tk_status = 0;
2451                         return -EAGAIN;
2452         }
2453         task->tk_status = nfs4_map_errors(task->tk_status);
2454         return 0;
2455 }
2456
2457 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs4_client *clp)
2458 {
2459         DEFINE_WAIT(wait);
2460         sigset_t oldset;
2461         int interruptible, res = 0;
2462
2463         might_sleep();
2464
2465         rpc_clnt_sigmask(clnt, &oldset);
2466         interruptible = TASK_UNINTERRUPTIBLE;
2467         if (clnt->cl_intr)
2468                 interruptible = TASK_INTERRUPTIBLE;
2469         prepare_to_wait(&clp->cl_waitq, &wait, interruptible);
2470         nfs4_schedule_state_recovery(clp);
2471         if (clnt->cl_intr && signalled())
2472                 res = -ERESTARTSYS;
2473         else if (!test_bit(NFS4CLNT_OK, &clp->cl_state))
2474                 schedule();
2475         finish_wait(&clp->cl_waitq, &wait);
2476         rpc_clnt_sigunmask(clnt, &oldset);
2477         return res;
2478 }
2479
2480 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2481 {
2482         sigset_t oldset;
2483         int res = 0;
2484
2485         might_sleep();
2486
2487         if (*timeout <= 0)
2488                 *timeout = NFS4_POLL_RETRY_MIN;
2489         if (*timeout > NFS4_POLL_RETRY_MAX)
2490                 *timeout = NFS4_POLL_RETRY_MAX;
2491         rpc_clnt_sigmask(clnt, &oldset);
2492         if (clnt->cl_intr) {
2493                 schedule_timeout_interruptible(*timeout);
2494                 if (signalled())
2495                         res = -ERESTARTSYS;
2496         } else
2497                 schedule_timeout_uninterruptible(*timeout);
2498         rpc_clnt_sigunmask(clnt, &oldset);
2499         *timeout <<= 1;
2500         return res;
2501 }
2502
2503 /* This is the error handling routine for processes that are allowed
2504  * to sleep.
2505  */
2506 int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
2507 {
2508         struct nfs4_client *clp = server->nfs4_state;
2509         int ret = errorcode;
2510
2511         exception->retry = 0;
2512         switch(errorcode) {
2513                 case 0:
2514                         return 0;
2515                 case -NFS4ERR_STALE_CLIENTID:
2516                 case -NFS4ERR_STALE_STATEID:
2517                 case -NFS4ERR_EXPIRED:
2518                         ret = nfs4_wait_clnt_recover(server->client, clp);
2519                         if (ret == 0)
2520                                 exception->retry = 1;
2521                         break;
2522                 case -NFS4ERR_GRACE:
2523                 case -NFS4ERR_DELAY:
2524                         ret = nfs4_delay(server->client, &exception->timeout);
2525                         if (ret == 0)
2526                                 exception->retry = 1;
2527                         break;
2528                 case -NFS4ERR_OLD_STATEID:
2529                         if (ret == 0)
2530                                 exception->retry = 1;
2531         }
2532         /* We failed to handle the error */
2533         return nfs4_map_errors(ret);
2534 }
2535
2536 int nfs4_proc_setclientid(struct nfs4_client *clp, u32 program, unsigned short port)
2537 {
2538         nfs4_verifier sc_verifier;
2539         struct nfs4_setclientid setclientid = {
2540                 .sc_verifier = &sc_verifier,
2541                 .sc_prog = program,
2542         };
2543         struct rpc_message msg = {
2544                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2545                 .rpc_argp = &setclientid,
2546                 .rpc_resp = clp,
2547                 .rpc_cred = clp->cl_cred,
2548         };
2549         u32 *p;
2550         int loop = 0;
2551         int status;
2552
2553         p = (u32*)sc_verifier.data;
2554         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2555         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2556
2557         for(;;) {
2558                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2559                                 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
2560                                 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.s_addr),
2561                                 clp->cl_cred->cr_ops->cr_name,
2562                                 clp->cl_id_uniquifier);
2563                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2564                                 sizeof(setclientid.sc_netid), "tcp");
2565                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2566                                 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2567                                 clp->cl_ipaddr, port >> 8, port & 255);
2568
2569                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2570                 if (status != -NFS4ERR_CLID_INUSE)
2571                         break;
2572                 if (signalled())
2573                         break;
2574                 if (loop++ & 1)
2575                         ssleep(clp->cl_lease_time + 1);
2576                 else
2577                         if (++clp->cl_id_uniquifier == 0)
2578                                 break;
2579         }
2580         return status;
2581 }
2582
2583 int
2584 nfs4_proc_setclientid_confirm(struct nfs4_client *clp)
2585 {
2586         struct nfs_fsinfo fsinfo;
2587         struct rpc_message msg = {
2588                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2589                 .rpc_argp = clp,
2590                 .rpc_resp = &fsinfo,
2591                 .rpc_cred = clp->cl_cred,
2592         };
2593         unsigned long now;
2594         int status;
2595
2596         now = jiffies;
2597         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2598         if (status == 0) {
2599                 spin_lock(&clp->cl_lock);
2600                 clp->cl_lease_time = fsinfo.lease_time * HZ;
2601                 clp->cl_last_renewal = now;
2602                 spin_unlock(&clp->cl_lock);
2603         }
2604         return status;
2605 }
2606
2607 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2608 {
2609         struct nfs4_delegreturnargs args = {
2610                 .fhandle = NFS_FH(inode),
2611                 .stateid = stateid,
2612         };
2613         struct rpc_message msg = {
2614                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
2615                 .rpc_argp = &args,
2616                 .rpc_cred = cred,
2617         };
2618
2619         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2620 }
2621
2622 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2623 {
2624         struct nfs_server *server = NFS_SERVER(inode);
2625         struct nfs4_exception exception = { };
2626         int err;
2627         do {
2628                 err = _nfs4_proc_delegreturn(inode, cred, stateid);
2629                 switch (err) {
2630                         case -NFS4ERR_STALE_STATEID:
2631                         case -NFS4ERR_EXPIRED:
2632                                 nfs4_schedule_state_recovery(server->nfs4_state);
2633                         case 0:
2634                                 return 0;
2635                 }
2636                 err = nfs4_handle_exception(server, err, &exception);
2637         } while (exception.retry);
2638         return err;
2639 }
2640
2641 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
2642 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
2643
2644 /*
2645  * sleep, with exponential backoff, and retry the LOCK operation.
2646  */
2647 static unsigned long
2648 nfs4_set_lock_task_retry(unsigned long timeout)
2649 {
2650         schedule_timeout_interruptible(timeout);
2651         timeout <<= 1;
2652         if (timeout > NFS4_LOCK_MAXTIMEOUT)
2653                 return NFS4_LOCK_MAXTIMEOUT;
2654         return timeout;
2655 }
2656
2657 static inline int
2658 nfs4_lck_type(int cmd, struct file_lock *request)
2659 {
2660         /* set lock type */
2661         switch (request->fl_type) {
2662                 case F_RDLCK:
2663                         return IS_SETLKW(cmd) ? NFS4_READW_LT : NFS4_READ_LT;
2664                 case F_WRLCK:
2665                         return IS_SETLKW(cmd) ? NFS4_WRITEW_LT : NFS4_WRITE_LT;
2666                 case F_UNLCK:
2667                         return NFS4_WRITE_LT;
2668         }
2669         BUG();
2670         return 0;
2671 }
2672
2673 static inline uint64_t
2674 nfs4_lck_length(struct file_lock *request)
2675 {
2676         if (request->fl_end == OFFSET_MAX)
2677                 return ~(uint64_t)0;
2678         return request->fl_end - request->fl_start + 1;
2679 }
2680
2681 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
2682 {
2683         struct inode *inode = state->inode;
2684         struct nfs_server *server = NFS_SERVER(inode);
2685         struct nfs4_client *clp = server->nfs4_state;
2686         struct nfs_lockargs arg = {
2687                 .fh = NFS_FH(inode),
2688                 .type = nfs4_lck_type(cmd, request),
2689                 .offset = request->fl_start,
2690                 .length = nfs4_lck_length(request),
2691         };
2692         struct nfs_lockres res = {
2693                 .server = server,
2694         };
2695         struct rpc_message msg = {
2696                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
2697                 .rpc_argp       = &arg,
2698                 .rpc_resp       = &res,
2699                 .rpc_cred       = state->owner->so_cred,
2700         };
2701         struct nfs_lowner nlo;
2702         struct nfs4_lock_state *lsp;
2703         int status;
2704
2705         down_read(&clp->cl_sem);
2706         nlo.clientid = clp->cl_clientid;
2707         status = nfs4_set_lock_state(state, request);
2708         if (status != 0)
2709                 goto out;
2710         lsp = request->fl_u.nfs4_fl.owner;
2711         nlo.id = lsp->ls_id;
2712         arg.u.lockt = &nlo;
2713         status = rpc_call_sync(server->client, &msg, 0);
2714         if (!status) {
2715                 request->fl_type = F_UNLCK;
2716         } else if (status == -NFS4ERR_DENIED) {
2717                 int64_t len, start, end;
2718                 start = res.u.denied.offset;
2719                 len = res.u.denied.length;
2720                 end = start + len - 1;
2721                 if (end < 0 || len == 0)
2722                         request->fl_end = OFFSET_MAX;
2723                 else
2724                         request->fl_end = (loff_t)end;
2725                 request->fl_start = (loff_t)start;
2726                 request->fl_type = F_WRLCK;
2727                 if (res.u.denied.type & 1)
2728                         request->fl_type = F_RDLCK;
2729                 request->fl_pid = 0;
2730                 status = 0;
2731         }
2732 out:
2733         up_read(&clp->cl_sem);
2734         return status;
2735 }
2736
2737 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
2738 {
2739         struct nfs4_exception exception = { };
2740         int err;
2741
2742         do {
2743                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
2744                                 _nfs4_proc_getlk(state, cmd, request),
2745                                 &exception);
2746         } while (exception.retry);
2747         return err;
2748 }
2749
2750 static int do_vfs_lock(struct file *file, struct file_lock *fl)
2751 {
2752         int res = 0;
2753         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
2754                 case FL_POSIX:
2755                         res = posix_lock_file_wait(file, fl);
2756                         break;
2757                 case FL_FLOCK:
2758                         res = flock_lock_file_wait(file, fl);
2759                         break;
2760                 default:
2761                         BUG();
2762         }
2763         if (res < 0)
2764                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n",
2765                                 __FUNCTION__);
2766         return res;
2767 }
2768
2769 struct nfs4_unlockdata {
2770         struct nfs_lockargs arg;
2771         struct nfs_locku_opargs luargs;
2772         struct nfs_lockres res;
2773         struct nfs4_lock_state *lsp;
2774         struct nfs_open_context *ctx;
2775         atomic_t refcount;
2776         struct completion completion;
2777 };
2778
2779 static void nfs4_locku_release_calldata(struct nfs4_unlockdata *calldata)
2780 {
2781         if (atomic_dec_and_test(&calldata->refcount)) {
2782                 nfs_free_seqid(calldata->luargs.seqid);
2783                 nfs4_put_lock_state(calldata->lsp);
2784                 put_nfs_open_context(calldata->ctx);
2785                 kfree(calldata);
2786         }
2787 }
2788
2789 static void nfs4_locku_complete(struct nfs4_unlockdata *calldata)
2790 {
2791         complete(&calldata->completion);
2792         nfs4_locku_release_calldata(calldata);
2793 }
2794
2795 static void nfs4_locku_done(struct rpc_task *task)
2796 {
2797         struct nfs4_unlockdata *calldata = (struct nfs4_unlockdata *)task->tk_calldata;
2798
2799         nfs_increment_lock_seqid(task->tk_status, calldata->luargs.seqid);
2800         switch (task->tk_status) {
2801                 case 0:
2802                         memcpy(calldata->lsp->ls_stateid.data,
2803                                         calldata->res.u.stateid.data,
2804                                         sizeof(calldata->lsp->ls_stateid.data));
2805                         break;
2806                 case -NFS4ERR_STALE_STATEID:
2807                 case -NFS4ERR_EXPIRED:
2808                         nfs4_schedule_state_recovery(calldata->res.server->nfs4_state);
2809                         break;
2810                 default:
2811                         if (nfs4_async_handle_error(task, calldata->res.server) == -EAGAIN) {
2812                                 rpc_restart_call(task);
2813                                 return;
2814                         }
2815         }
2816         nfs4_locku_complete(calldata);
2817 }
2818
2819 static void nfs4_locku_begin(struct rpc_task *task)
2820 {
2821         struct nfs4_unlockdata *calldata = (struct nfs4_unlockdata *)task->tk_calldata;
2822         struct rpc_message msg = {
2823                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
2824                 .rpc_argp       = &calldata->arg,
2825                 .rpc_resp       = &calldata->res,
2826                 .rpc_cred       = calldata->lsp->ls_state->owner->so_cred,
2827         };
2828         int status;
2829
2830         status = nfs_wait_on_sequence(calldata->luargs.seqid, task);
2831         if (status != 0)
2832                 return;
2833         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
2834                 nfs4_locku_complete(calldata);
2835                 task->tk_exit = NULL;
2836                 rpc_exit(task, 0);
2837                 return;
2838         }
2839         rpc_call_setup(task, &msg, 0);
2840 }
2841
2842 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
2843 {
2844         struct nfs4_unlockdata *calldata;
2845         struct inode *inode = state->inode;
2846         struct nfs_server *server = NFS_SERVER(inode);
2847         struct nfs4_lock_state *lsp;
2848         int status;
2849
2850         status = nfs4_set_lock_state(state, request);
2851         if (status != 0)
2852                 return status;
2853         lsp = request->fl_u.nfs4_fl.owner;
2854         /* We might have lost the locks! */
2855         if ((lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0)
2856                 return 0;
2857         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
2858         if (calldata == NULL)
2859                 return -ENOMEM;
2860         calldata->luargs.seqid = nfs_alloc_seqid(&lsp->ls_seqid);
2861         if (calldata->luargs.seqid == NULL) {
2862                 kfree(calldata);
2863                 return -ENOMEM;
2864         }
2865         calldata->luargs.stateid = &lsp->ls_stateid;
2866         calldata->arg.fh = NFS_FH(inode);
2867         calldata->arg.type = nfs4_lck_type(cmd, request);
2868         calldata->arg.offset = request->fl_start;
2869         calldata->arg.length = nfs4_lck_length(request);
2870         calldata->arg.u.locku = &calldata->luargs;
2871         calldata->res.server = server;
2872         calldata->lsp = lsp;
2873         atomic_inc(&lsp->ls_count);
2874
2875         /* Ensure we don't close file until we're done freeing locks! */
2876         calldata->ctx = get_nfs_open_context((struct nfs_open_context*)request->fl_file->private_data);
2877
2878         atomic_set(&calldata->refcount, 2);
2879         init_completion(&calldata->completion);
2880
2881         status = nfs4_call_async(NFS_SERVER(inode)->client, nfs4_locku_begin,
2882                         nfs4_locku_done, calldata);
2883         if (status == 0)
2884                 wait_for_completion_interruptible(&calldata->completion);
2885         do_vfs_lock(request->fl_file, request);
2886         nfs4_locku_release_calldata(calldata);
2887         return status;
2888 }
2889
2890 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *request, int reclaim)
2891 {
2892         struct inode *inode = state->inode;
2893         struct nfs_server *server = NFS_SERVER(inode);
2894         struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner;
2895         struct nfs_lock_opargs largs = {
2896                 .lock_stateid = &lsp->ls_stateid,
2897                 .open_stateid = &state->stateid,
2898                 .lock_owner = {
2899                         .clientid = server->nfs4_state->cl_clientid,
2900                         .id = lsp->ls_id,
2901                 },
2902                 .reclaim = reclaim,
2903         };
2904         struct nfs_lockargs arg = {
2905                 .fh = NFS_FH(inode),
2906                 .type = nfs4_lck_type(cmd, request),
2907                 .offset = request->fl_start,
2908                 .length = nfs4_lck_length(request),
2909                 .u = {
2910                         .lock = &largs,
2911                 },
2912         };
2913         struct nfs_lockres res = {
2914                 .server = server,
2915         };
2916         struct rpc_message msg = {
2917                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
2918                 .rpc_argp       = &arg,
2919                 .rpc_resp       = &res,
2920                 .rpc_cred       = state->owner->so_cred,
2921         };
2922         int status = -ENOMEM;
2923
2924         largs.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
2925         if (largs.lock_seqid == NULL)
2926                 return -ENOMEM;
2927         if (!(lsp->ls_seqid.flags & NFS_SEQID_CONFIRMED)) {
2928                 struct nfs4_state_owner *owner = state->owner;
2929
2930                 largs.open_seqid = nfs_alloc_seqid(&owner->so_seqid);
2931                 if (largs.open_seqid == NULL)
2932                         goto out;
2933                 largs.new_lock_owner = 1;
2934                 status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
2935                 /* increment open seqid on success, and seqid mutating errors */
2936                 if (largs.new_lock_owner != 0) {
2937                         nfs_increment_open_seqid(status, largs.open_seqid);
2938                         if (status == 0)
2939                                 nfs_confirm_seqid(&lsp->ls_seqid, 0);
2940                 }
2941                 nfs_free_seqid(largs.open_seqid);
2942         } else
2943                 status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
2944         /* increment lock seqid on success, and seqid mutating errors*/
2945         nfs_increment_lock_seqid(status, largs.lock_seqid);
2946         /* save the returned stateid. */
2947         if (status == 0) {
2948                 memcpy(lsp->ls_stateid.data, res.u.stateid.data,
2949                                 sizeof(lsp->ls_stateid.data));
2950                 lsp->ls_flags |= NFS_LOCK_INITIALIZED;
2951         } else if (status == -NFS4ERR_DENIED)
2952                 status = -EAGAIN;
2953 out:
2954         nfs_free_seqid(largs.lock_seqid);
2955         return status;
2956 }
2957
2958 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
2959 {
2960         struct nfs_server *server = NFS_SERVER(state->inode);
2961         struct nfs4_exception exception = { };
2962         int err;
2963
2964         do {
2965                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
2966                 if (err != -NFS4ERR_DELAY)
2967                         break;
2968                 nfs4_handle_exception(server, err, &exception);
2969         } while (exception.retry);
2970         return err;
2971 }
2972
2973 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
2974 {
2975         struct nfs_server *server = NFS_SERVER(state->inode);
2976         struct nfs4_exception exception = { };
2977         int err;
2978
2979         do {
2980                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
2981                 if (err != -NFS4ERR_DELAY)
2982                         break;
2983                 nfs4_handle_exception(server, err, &exception);
2984         } while (exception.retry);
2985         return err;
2986 }
2987
2988 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
2989 {
2990         struct nfs4_client *clp = state->owner->so_client;
2991         int status;
2992
2993         down_read(&clp->cl_sem);
2994         status = nfs4_set_lock_state(state, request);
2995         if (status == 0)
2996                 status = _nfs4_do_setlk(state, cmd, request, 0);
2997         if (status == 0) {
2998                 /* Note: we always want to sleep here! */
2999                 request->fl_flags |= FL_SLEEP;
3000                 if (do_vfs_lock(request->fl_file, request) < 0)
3001                         printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
3002         }
3003         up_read(&clp->cl_sem);
3004         return status;
3005 }
3006
3007 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3008 {
3009         struct nfs4_exception exception = { };
3010         int err;
3011
3012         do {
3013                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3014                                 _nfs4_proc_setlk(state, cmd, request),
3015                                 &exception);
3016         } while (exception.retry);
3017         return err;
3018 }
3019
3020 static int
3021 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3022 {
3023         struct nfs_open_context *ctx;
3024         struct nfs4_state *state;
3025         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3026         int status;
3027
3028         /* verify open state */
3029         ctx = (struct nfs_open_context *)filp->private_data;
3030         state = ctx->state;
3031
3032         if (request->fl_start < 0 || request->fl_end < 0)
3033                 return -EINVAL;
3034
3035         if (IS_GETLK(cmd))
3036                 return nfs4_proc_getlk(state, F_GETLK, request);
3037
3038         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3039                 return -EINVAL;
3040
3041         if (request->fl_type == F_UNLCK)
3042                 return nfs4_proc_unlck(state, cmd, request);
3043
3044         do {
3045                 status = nfs4_proc_setlk(state, cmd, request);
3046                 if ((status != -EAGAIN) || IS_SETLK(cmd))
3047                         break;
3048                 timeout = nfs4_set_lock_task_retry(timeout);
3049                 status = -ERESTARTSYS;
3050                 if (signalled())
3051                         break;
3052         } while(status < 0);
3053         return status;
3054 }
3055
3056
3057 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3058
3059 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3060                 size_t buflen, int flags)
3061 {
3062         struct inode *inode = dentry->d_inode;
3063
3064         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3065                 return -EOPNOTSUPP;
3066
3067         if (!S_ISREG(inode->i_mode) &&
3068             (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
3069                 return -EPERM;
3070
3071         return nfs4_proc_set_acl(inode, buf, buflen);
3072 }
3073
3074 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
3075  * and that's what we'll do for e.g. user attributes that haven't been set.
3076  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3077  * attributes in kernel-managed attribute namespaces. */
3078 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3079                 size_t buflen)
3080 {
3081         struct inode *inode = dentry->d_inode;
3082
3083         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3084                 return -EOPNOTSUPP;
3085
3086         return nfs4_proc_get_acl(inode, buf, buflen);
3087 }
3088
3089 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3090 {
3091         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
3092
3093         if (buf && buflen < len)
3094                 return -ERANGE;
3095         if (buf)
3096                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3097         return len;
3098 }
3099
3100 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3101         .recover_open   = nfs4_open_reclaim,
3102         .recover_lock   = nfs4_lock_reclaim,
3103 };
3104
3105 struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3106         .recover_open   = nfs4_open_expired,
3107         .recover_lock   = nfs4_lock_expired,
3108 };
3109
3110 static struct inode_operations nfs4_file_inode_operations = {
3111         .permission     = nfs_permission,
3112         .getattr        = nfs_getattr,
3113         .setattr        = nfs_setattr,
3114         .getxattr       = nfs4_getxattr,
3115         .setxattr       = nfs4_setxattr,
3116         .listxattr      = nfs4_listxattr,
3117 };
3118
3119 struct nfs_rpc_ops      nfs_v4_clientops = {
3120         .version        = 4,                    /* protocol version */
3121         .dentry_ops     = &nfs4_dentry_operations,
3122         .dir_inode_ops  = &nfs4_dir_inode_operations,
3123         .file_inode_ops = &nfs4_file_inode_operations,
3124         .getroot        = nfs4_proc_get_root,
3125         .getattr        = nfs4_proc_getattr,
3126         .setattr        = nfs4_proc_setattr,
3127         .lookup         = nfs4_proc_lookup,
3128         .access         = nfs4_proc_access,
3129         .readlink       = nfs4_proc_readlink,
3130         .read           = nfs4_proc_read,
3131         .write          = nfs4_proc_write,
3132         .commit         = nfs4_proc_commit,
3133         .create         = nfs4_proc_create,
3134         .remove         = nfs4_proc_remove,
3135         .unlink_setup   = nfs4_proc_unlink_setup,
3136         .unlink_done    = nfs4_proc_unlink_done,
3137         .rename         = nfs4_proc_rename,
3138         .link           = nfs4_proc_link,
3139         .symlink        = nfs4_proc_symlink,
3140         .mkdir          = nfs4_proc_mkdir,
3141         .rmdir          = nfs4_proc_remove,
3142         .readdir        = nfs4_proc_readdir,
3143         .mknod          = nfs4_proc_mknod,
3144         .statfs         = nfs4_proc_statfs,
3145         .fsinfo         = nfs4_proc_fsinfo,
3146         .pathconf       = nfs4_proc_pathconf,
3147         .decode_dirent  = nfs4_decode_dirent,
3148         .read_setup     = nfs4_proc_read_setup,
3149         .write_setup    = nfs4_proc_write_setup,
3150         .commit_setup   = nfs4_proc_commit_setup,
3151         .file_open      = nfs_open,
3152         .file_release   = nfs_release,
3153         .lock           = nfs4_proc_lock,
3154         .clear_acl_cache = nfs4_zap_acl_attr,
3155 };
3156
3157 /*
3158  * Local variables:
3159  *  c-basic-offset: 8
3160  * End:
3161  */