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(&inode->i_lock);
 216         state->state |= open_flags;
 217         /* NB! List reordering - see the reclaim code for why.  */
 218         if ((open_flags & FMODE_WRITE) && 0 == state->nwriters++)
 219                 list_move(&state->open_states, &state->owner->so_states);
 220         if (open_flags & FMODE_READ)
 221                 state->nreaders++;
 222         memcpy(&state->stateid, stateid, sizeof(state->stateid));
 223         spin_unlock(&inode->i_lock);
 224 }
 225
 226 /*
 227  * OPEN_RECLAIM:
 228  *      reclaim state on the server after a reboot.
 229  */
 230 static int _nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
 231 {
 232         struct inode *inode = state->inode;
 233         struct nfs_server *server = NFS_SERVER(inode);
 234         struct nfs_delegation *delegation = NFS_I(inode)->delegation;
 235         struct nfs_openargs o_arg = {
 236                 .fh = NFS_FH(inode),
 237                 .id = sp->so_id,
 238                 .open_flags = state->state,
 239                 .clientid = server->nfs4_state->cl_clientid,
 240                 .claim = NFS4_OPEN_CLAIM_PREVIOUS,
 241                 .bitmask = server->attr_bitmask,
 242         };
 243         struct nfs_openres o_res = {
 244                 .server = server,       /* Grrr */
 245         };
 246         struct rpc_message msg = {
 247                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR],
 248                 .rpc_argp       = &o_arg,
 249                 .rpc_resp       = &o_res,
 250                 .rpc_cred       = sp->so_cred,
 251         };
 252         int status;
 253
 254         if (delegation != NULL) {
 255                 if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
 256                         memcpy(&state->stateid, &delegation->stateid,
 257                                         sizeof(state->stateid));
 258                         set_bit(NFS_DELEGATED_STATE, &state->flags);
 259                         return 0;
 260                 }
 261                 o_arg.u.delegation_type = delegation->type;
 262         }
 263         o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 264         if (o_arg.seqid == NULL)
 265                 return -ENOMEM;
 266         status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
 267         /* Confirm the sequence as being established */
 268         nfs_confirm_seqid(&sp->so_seqid, status);
 269         nfs_increment_open_seqid(status, o_arg.seqid);
 270         if (status == 0) {
 271                 memcpy(&state->stateid, &o_res.stateid, sizeof(state->stateid));
 272                 if (o_res.delegation_type != 0) {
 273                         nfs_inode_reclaim_delegation(inode, sp->so_cred, &o_res);
 274                         /* Did the server issue an immediate delegation recall? */
 275                         if (o_res.do_recall)
 276                                 nfs_async_inode_return_delegation(inode, &o_res.stateid);
 277                 }
 278         }
 279         nfs_free_seqid(o_arg.seqid);
 280         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 281         /* Ensure we update the inode attributes */
 282         NFS_CACHEINV(inode);
 283         return status;
 284 }
 285
 286 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
 287 {
 288         struct nfs_server *server = NFS_SERVER(state->inode);
 289         struct nfs4_exception exception = { };
 290         int err;
 291         do {
 292                 err = _nfs4_open_reclaim(sp, state);
 293                 if (err != -NFS4ERR_DELAY)
 294                         break;
 295                 nfs4_handle_exception(server, err, &exception);
 296         } while (exception.retry);
 297         return err;
 298 }
 299
 300 static int _nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
 301 {
 302         struct nfs4_state_owner  *sp  = state->owner;
 303         struct inode *inode = dentry->d_inode;
 304         struct nfs_server *server = NFS_SERVER(inode);
 305         struct dentry *parent = dget_parent(dentry);
 306         struct nfs_openargs arg = {
 307                 .fh = NFS_FH(parent->d_inode),
 308                 .clientid = server->nfs4_state->cl_clientid,
 309                 .name = &dentry->d_name,
 310                 .id = sp->so_id,
 311                 .server = server,
 312                 .bitmask = server->attr_bitmask,
 313                 .claim = NFS4_OPEN_CLAIM_DELEGATE_CUR,
 314         };
 315         struct nfs_openres res = {
 316                 .server = server,
 317         };
 318         struct  rpc_message msg = {
 319                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR],
 320                 .rpc_argp       = &arg,
 321                 .rpc_resp       = &res,
 322                 .rpc_cred       = sp->so_cred,
 323         };
 324         int status = 0;
 325
 326         if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
 327                 goto out;
 328         if (state->state == 0)
 329                 goto out;
 330         arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 331         status = -ENOMEM;
 332         if (arg.seqid == NULL)
 333                 goto out;
 334         arg.open_flags = state->state;
 335         memcpy(arg.u.delegation.data, state->stateid.data, sizeof(arg.u.delegation.data));
 336         status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
 337         nfs_increment_open_seqid(status, arg.seqid);
 338         if (status != 0)
 339                 goto out_free;
 340         if(res.rflags & NFS4_OPEN_RESULT_CONFIRM) {
 341                 status = _nfs4_proc_open_confirm(server->client, NFS_FH(inode),
 342                                 sp, &res.stateid, arg.seqid);
 343                 if (status != 0)
 344                         goto out_free;
 345         }
 346         nfs_confirm_seqid(&sp->so_seqid, 0);
 347         if (status >= 0) {
 348                 memcpy(state->stateid.data, res.stateid.data,
 349                                 sizeof(state->stateid.data));
 350                 clear_bit(NFS_DELEGATED_STATE, &state->flags);
 351         }
 352 out_free:
 353         nfs_free_seqid(arg.seqid);
 354 out:
 355         dput(parent);
 356         return status;
 357 }
 358
 359 int nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
 360 {
 361         struct nfs4_exception exception = { };
 362         struct nfs_server *server = NFS_SERVER(dentry->d_inode);
 363         int err;
 364         do {
 365                 err = _nfs4_open_delegation_recall(dentry, state);
 366                 switch (err) {
 367                         case 0:
 368                                 return err;
 369                         case -NFS4ERR_STALE_CLIENTID:
 370                         case -NFS4ERR_STALE_STATEID:
 371                         case -NFS4ERR_EXPIRED:
 372                                 /* Don't recall a delegation if it was lost */
 373                                 nfs4_schedule_state_recovery(server->nfs4_state);
 374                                 return err;
 375                 }
 376                 err = nfs4_handle_exception(server, err, &exception);
 377         } while (exception.retry);
 378         return err;
 379 }
 380
 381 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)
 382 {
 383         struct nfs_open_confirmargs arg = {
 384                 .fh             = fh,
 385                 .seqid          = seqid,
 386                 .stateid        = *stateid,
 387         };
 388         struct nfs_open_confirmres res;
 389         struct  rpc_message msg = {
 390                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
 391                 .rpc_argp       = &arg,
 392                 .rpc_resp       = &res,
 393                 .rpc_cred       = sp->so_cred,
 394         };
 395         int status;
 396
 397         status = rpc_call_sync(clnt, &msg, RPC_TASK_NOINTR);
 398         /* Confirm the sequence as being established */
 399         nfs_confirm_seqid(&sp->so_seqid, status);
 400         nfs_increment_open_seqid(status, seqid);
 401         if (status >= 0)
 402                 memcpy(stateid, &res.stateid, sizeof(*stateid));
 403         return status;
 404 }
 405
 406 static int _nfs4_proc_open(struct inode *dir, struct nfs4_state_owner  *sp, struct nfs_openargs *o_arg, struct nfs_openres *o_res)
 407 {
 408         struct nfs_server *server = NFS_SERVER(dir);
 409         struct rpc_message msg = {
 410                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
 411                 .rpc_argp = o_arg,
 412                 .rpc_resp = o_res,
 413                 .rpc_cred = sp->so_cred,
 414         };
 415         int status;
 416
 417         /* Update sequence id. The caller must serialize! */
 418         o_arg->id = sp->so_id;
 419         o_arg->clientid = sp->so_client->cl_clientid;
 420
 421         status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
 422         if (status == 0) {
 423                 /* OPEN on anything except a regular file is disallowed in NFSv4 */
 424                 switch (o_res->f_attr->mode & S_IFMT) {
 425                         case S_IFREG:
 426                                 break;
 427                         case S_IFLNK:
 428                                 status = -ELOOP;
 429                                 break;
 430                         case S_IFDIR:
 431                                 status = -EISDIR;
 432                                 break;
 433                         default:
 434                                 status = -ENOTDIR;
 435                 }
 436         }
 437
 438         nfs_increment_open_seqid(status, o_arg->seqid);
 439         if (status != 0)
 440                 goto out;
 441         update_changeattr(dir, &o_res->cinfo);
 442         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
 443                 status = _nfs4_proc_open_confirm(server->client, &o_res->fh,
 444                                 sp, &o_res->stateid, o_arg->seqid);
 445                 if (status != 0)
 446                         goto out;
 447         }
 448         nfs_confirm_seqid(&sp->so_seqid, 0);
 449         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
 450                 status = server->rpc_ops->getattr(server, &o_res->fh, o_res->f_attr);
 451 out:
 452         return status;
 453 }
 454
 455 static int _nfs4_do_access(struct inode *inode, struct rpc_cred *cred, int openflags)
 456 {
 457         struct nfs_access_entry cache;
 458         int mask = 0;
 459         int status;
 460
 461         if (openflags & FMODE_READ)
 462                 mask |= MAY_READ;
 463         if (openflags & FMODE_WRITE)
 464                 mask |= MAY_WRITE;
 465         status = nfs_access_get_cached(inode, cred, &cache);
 466         if (status == 0)
 467                 goto out;
 468
 469         /* Be clever: ask server to check for all possible rights */
 470         cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ;
 471         cache.cred = cred;
 472         cache.jiffies = jiffies;
 473         status = _nfs4_proc_access(inode, &cache);
 474         if (status != 0)
 475                 return status;
 476         nfs_access_add_cache(inode, &cache);
 477 out:
 478         if ((cache.mask & mask) == mask)
 479                 return 0;
 480         return -EACCES;
 481 }
 482
 483 /*
 484  * OPEN_EXPIRED:
 485  *      reclaim state on the server after a network partition.
 486  *      Assumes caller holds the appropriate lock
 487  */
 488 static int _nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
 489 {
 490         struct dentry *parent = dget_parent(dentry);
 491         struct inode *dir = parent->d_inode;
 492         struct inode *inode = state->inode;
 493         struct nfs_server *server = NFS_SERVER(dir);
 494         struct nfs_delegation *delegation = NFS_I(inode)->delegation;
 495         struct nfs_fattr        f_attr = {
 496                 .valid = 0,
 497         };
 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         status = _nfs4_proc_open(dir, sp, &o_arg, &o_res);
 524         if (status != 0)
 525                 goto out_nodeleg;
 526         /* Check if files differ */
 527         if ((f_attr.mode & S_IFMT) != (inode->i_mode & S_IFMT))
 528                 goto out_stale;
 529         /* Has the file handle changed? */
 530         if (nfs_compare_fh(&o_res.fh, NFS_FH(inode)) != 0) {
 531                 /* Verify if the change attributes are the same */
 532                 if (f_attr.change_attr != NFS_I(inode)->change_attr)
 533                         goto out_stale;
 534                 if (nfs_size_to_loff_t(f_attr.size) != inode->i_size)
 535                         goto out_stale;
 536                 /* Lets just pretend that this is the same file */
 537                 nfs_copy_fh(NFS_FH(inode), &o_res.fh);
 538                 NFS_I(inode)->fileid = f_attr.fileid;
 539         }
 540         memcpy(&state->stateid, &o_res.stateid, sizeof(state->stateid));
 541         if (o_res.delegation_type != 0) {
 542                 if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM))
 543                         nfs_inode_set_delegation(inode, sp->so_cred, &o_res);
 544                 else
 545                         nfs_inode_reclaim_delegation(inode, sp->so_cred, &o_res);
 546         }
 547 out_nodeleg:
 548         nfs_free_seqid(o_arg.seqid);
 549         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 550 out:
 551         dput(parent);
 552         return status;
 553 out_stale:
 554         status = -ESTALE;
 555         /* Invalidate the state owner so we don't ever use it again */
 556         nfs4_drop_state_owner(sp);
 557         d_drop(dentry);
 558         /* Should we be trying to close that stateid? */
 559         goto out_nodeleg;
 560 }
 561
 562 static inline int nfs4_do_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
 563 {
 564         struct nfs_server *server = NFS_SERVER(dentry->d_inode);
 565         struct nfs4_exception exception = { };
 566         int err;
 567
 568         do {
 569                 err = _nfs4_open_expired(sp, state, dentry);
 570                 if (err == -NFS4ERR_DELAY)
 571                         nfs4_handle_exception(server, err, &exception);
 572         } while (exception.retry);
 573         return err;
 574 }
 575
 576 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
 577 {
 578         struct nfs_inode *nfsi = NFS_I(state->inode);
 579         struct nfs_open_context *ctx;
 580         int status;
 581
 582         spin_lock(&state->inode->i_lock);
 583         list_for_each_entry(ctx, &nfsi->open_files, list) {
 584                 if (ctx->state != state)
 585                         continue;
 586                 get_nfs_open_context(ctx);
 587                 spin_unlock(&state->inode->i_lock);
 588                 status = nfs4_do_open_expired(sp, state, ctx->dentry);
 589                 put_nfs_open_context(ctx);
 590                 return status;
 591         }
 592         spin_unlock(&state->inode->i_lock);
 593         return -ENOENT;
 594 }
 595
 596 /*
 597  * Returns an nfs4_state + an extra reference to the inode
 598  */
 599 static int _nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred, struct nfs4_state **res)
 600 {
 601         struct nfs_delegation *delegation;
 602         struct nfs_server *server = NFS_SERVER(inode);
 603         struct nfs4_client *clp = server->nfs4_state;
 604         struct nfs_inode *nfsi = NFS_I(inode);
 605         struct nfs4_state_owner *sp = NULL;
 606         struct nfs4_state *state = NULL;
 607         int open_flags = flags & (FMODE_READ|FMODE_WRITE);
 608         int err;
 609
 610         /* Protect against reboot recovery - NOTE ORDER! */
 611         down_read(&clp->cl_sem);
 612         /* Protect against delegation recall */
 613         down_read(&nfsi->rwsem);
 614         delegation = NFS_I(inode)->delegation;
 615         err = -ENOENT;
 616         if (delegation == NULL || (delegation->type & open_flags) != open_flags)
 617                 goto out_err;
 618         err = -ENOMEM;
 619         if (!(sp = nfs4_get_state_owner(server, cred))) {
 620                 dprintk("%s: nfs4_get_state_owner failed!\n", __FUNCTION__);
 621                 goto out_err;
 622         }
 623         state = nfs4_get_open_state(inode, sp);
 624         if (state == NULL)
 625                 goto out_err;
 626
 627         err = -ENOENT;
 628         if ((state->state & open_flags) == open_flags) {
 629                 spin_lock(&inode->i_lock);
 630                 if (open_flags & FMODE_READ)
 631                         state->nreaders++;
 632                 if (open_flags & FMODE_WRITE)
 633                         state->nwriters++;
 634                 spin_unlock(&inode->i_lock);
 635                 goto out_ok;
 636         } else if (state->state != 0)
 637                 goto out_err;
 638
 639         lock_kernel();
 640         err = _nfs4_do_access(inode, cred, open_flags);
 641         unlock_kernel();
 642         if (err != 0)
 643                 goto out_err;
 644         set_bit(NFS_DELEGATED_STATE, &state->flags);
 645         update_open_stateid(state, &delegation->stateid, open_flags);
 646 out_ok:
 647         nfs4_put_state_owner(sp);
 648         up_read(&nfsi->rwsem);
 649         up_read(&clp->cl_sem);
 650         igrab(inode);
 651         *res = state;
 652         return 0;
 653 out_err:
 654         if (sp != NULL) {
 655                 if (state != NULL)
 656                         nfs4_put_open_state(state);
 657                 nfs4_put_state_owner(sp);
 658         }
 659         up_read(&nfsi->rwsem);
 660         up_read(&clp->cl_sem);
 661         if (err != -EACCES)
 662                 nfs_inode_return_delegation(inode);
 663         return err;
 664 }
 665
 666 static struct nfs4_state *nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred)
 667 {
 668         struct nfs4_exception exception = { };
 669         struct nfs4_state *res;
 670         int err;
 671
 672         do {
 673                 err = _nfs4_open_delegated(inode, flags, cred, &res);
 674                 if (err == 0)
 675                         break;
 676                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(inode),
 677                                         err, &exception));
 678         } while (exception.retry);
 679         return res;
 680 }
 681
 682 /*
 683  * Returns an nfs4_state + an referenced inode
 684  */
 685 static int _nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
 686 {
 687         struct nfs4_state_owner  *sp;
 688         struct nfs4_state     *state = NULL;
 689         struct nfs_server       *server = NFS_SERVER(dir);
 690         struct nfs4_client *clp = server->nfs4_state;
 691         struct inode *inode = NULL;
 692         int                     status;
 693         struct nfs_fattr        f_attr = {
 694                 .valid          = 0,
 695         };
 696         struct nfs_openargs o_arg = {
 697                 .fh             = NFS_FH(dir),
 698                 .open_flags     = flags,
 699                 .name           = &dentry->d_name,
 700                 .server         = server,
 701                 .bitmask = server->attr_bitmask,
 702                 .claim = NFS4_OPEN_CLAIM_NULL,
 703         };
 704         struct nfs_openres o_res = {
 705                 .f_attr         = &f_attr,
 706                 .server         = server,
 707         };
 708
 709         /* Protect against reboot recovery conflicts */
 710         down_read(&clp->cl_sem);
 711         status = -ENOMEM;
 712         if (!(sp = nfs4_get_state_owner(server, cred))) {
 713                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
 714                 goto out_err;
 715         }
 716         if (flags & O_EXCL) {
 717                 u32 *p = (u32 *) o_arg.u.verifier.data;
 718                 p[0] = jiffies;
 719                 p[1] = current->pid;
 720         } else
 721                 o_arg.u.attrs = sattr;
 722         /* Serialization for the sequence id */
 723
 724         o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 725         if (o_arg.seqid == NULL)
 726                 return -ENOMEM;
 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         fattr->valid = 0;
 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 nfs_fattr *      fattr = info->fattr;
1109         struct nfs4_lookup_root_arg args = {
1110                 .bitmask = nfs4_fattr_bitmap,
1111         };
1112         struct nfs4_lookup_res res = {
1113                 .server = server,
1114                 .fattr = fattr,
1115                 .fh = fhandle,
1116         };
1117         struct rpc_message msg = {
1118                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1119                 .rpc_argp = &args,
1120                 .rpc_resp = &res,
1121         };
1122         fattr->valid = 0;
1123         return rpc_call_sync(server->client, &msg, 0);
1124 }
1125
1126 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1127                 struct nfs_fsinfo *info)
1128 {
1129         struct nfs4_exception exception = { };
1130         int err;
1131         do {
1132                 err = nfs4_handle_exception(server,
1133                                 _nfs4_lookup_root(server, fhandle, info),
1134                                 &exception);
1135         } while (exception.retry);
1136         return err;
1137 }
1138
1139 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1140                 struct nfs_fsinfo *info)
1141 {
1142         struct nfs_fattr *      fattr = info->fattr;
1143         unsigned char *         p;
1144         struct qstr             q;
1145         struct nfs4_lookup_arg args = {
1146                 .dir_fh = fhandle,
1147                 .name = &q,
1148                 .bitmask = nfs4_fattr_bitmap,
1149         };
1150         struct nfs4_lookup_res res = {
1151                 .server = server,
1152                 .fattr = fattr,
1153                 .fh = fhandle,
1154         };
1155         struct rpc_message msg = {
1156                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1157                 .rpc_argp = &args,
1158                 .rpc_resp = &res,
1159         };
1160         int status;
1161
1162         /*
1163          * Now we do a separate LOOKUP for each component of the mount path.
1164          * The LOOKUPs are done separately so that we can conveniently
1165          * catch an ERR_WRONGSEC if it occurs along the way...
1166          */
1167         status = nfs4_lookup_root(server, fhandle, info);
1168         if (status)
1169                 goto out;
1170
1171         p = server->mnt_path;
1172         for (;;) {
1173                 struct nfs4_exception exception = { };
1174
1175                 while (*p == '/')
1176                         p++;
1177                 if (!*p)
1178                         break;
1179                 q.name = p;
1180                 while (*p && (*p != '/'))
1181                         p++;
1182                 q.len = p - q.name;
1183
1184                 do {
1185                         fattr->valid = 0;
1186                         status = nfs4_handle_exception(server,
1187                                         rpc_call_sync(server->client, &msg, 0),
1188                                         &exception);
1189                 } while (exception.retry);
1190                 if (status == 0)
1191                         continue;
1192                 if (status == -ENOENT) {
1193                         printk(KERN_NOTICE "NFS: mount path %s does not exist!\n", server->mnt_path);
1194                         printk(KERN_NOTICE "NFS: suggestion: try mounting '/' instead.\n");
1195                 }
1196                 break;
1197         }
1198         if (status == 0)
1199                 status = nfs4_server_capabilities(server, fhandle);
1200         if (status == 0)
1201                 status = nfs4_do_fsinfo(server, fhandle, info);
1202 out:
1203         return status;
1204 }
1205
1206 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1207 {
1208         struct nfs4_getattr_arg args = {
1209                 .fh = fhandle,
1210                 .bitmask = server->attr_bitmask,
1211         };
1212         struct nfs4_getattr_res res = {
1213                 .fattr = fattr,
1214                 .server = server,
1215         };
1216         struct rpc_message msg = {
1217                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1218                 .rpc_argp = &args,
1219                 .rpc_resp = &res,
1220         };
1221
1222         fattr->valid = 0;
1223         return rpc_call_sync(server->client, &msg, 0);
1224 }
1225
1226 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1227 {
1228         struct nfs4_exception exception = { };
1229         int err;
1230         do {
1231                 err = nfs4_handle_exception(server,
1232                                 _nfs4_proc_getattr(server, fhandle, fattr),
1233                                 &exception);
1234         } while (exception.retry);
1235         return err;
1236 }
1237
1238 /*
1239  * The file is not closed if it is opened due to the a request to change
1240  * the size of the file. The open call will not be needed once the
1241  * VFS layer lookup-intents are implemented.
1242  *
1243  * Close is called when the inode is destroyed.
1244  * If we haven't opened the file for O_WRONLY, we
1245  * need to in the size_change case to obtain a stateid.
1246  *
1247  * Got race?
1248  * Because OPEN is always done by name in nfsv4, it is
1249  * possible that we opened a different file by the same
1250  * name.  We can recognize this race condition, but we
1251  * can't do anything about it besides returning an error.
1252  *
1253  * This will be fixed with VFS changes (lookup-intent).
1254  */
1255 static int
1256 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1257                   struct iattr *sattr)
1258 {
1259         struct rpc_cred *cred;
1260         struct inode *inode = dentry->d_inode;
1261         struct nfs4_state *state;
1262         int status;
1263
1264         fattr->valid = 0;
1265
1266         cred = rpcauth_lookupcred(NFS_SERVER(inode)->client->cl_auth, 0);
1267         if (IS_ERR(cred))
1268                 return PTR_ERR(cred);
1269         /* Search for an existing WRITE delegation first */
1270         state = nfs4_open_delegated(inode, FMODE_WRITE, cred);
1271         if (!IS_ERR(state)) {
1272                 /* NB: nfs4_open_delegated() bumps the inode->i_count */
1273                 iput(inode);
1274         } else {
1275                 /* Search for an existing open(O_WRITE) stateid */
1276                 state = nfs4_find_state(inode, cred, FMODE_WRITE);
1277         }
1278
1279         status = nfs4_do_setattr(NFS_SERVER(inode), fattr,
1280                         NFS_FH(inode), sattr, state);
1281         if (status == 0)
1282                 nfs_setattr_update_inode(inode, sattr);
1283         if (state != NULL)
1284                 nfs4_close_state(state, FMODE_WRITE);
1285         put_rpccred(cred);
1286         return status;
1287 }
1288
1289 static int _nfs4_proc_lookup(struct inode *dir, struct qstr *name,
1290                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1291 {
1292         int                    status;
1293         struct nfs_server *server = NFS_SERVER(dir);
1294         struct nfs4_lookup_arg args = {
1295                 .bitmask = server->attr_bitmask,
1296                 .dir_fh = NFS_FH(dir),
1297                 .name = name,
1298         };
1299         struct nfs4_lookup_res res = {
1300                 .server = server,
1301                 .fattr = fattr,
1302                 .fh = fhandle,
1303         };
1304         struct rpc_message msg = {
1305                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1306                 .rpc_argp = &args,
1307                 .rpc_resp = &res,
1308         };
1309
1310         fattr->valid = 0;
1311
1312         dprintk("NFS call  lookup %s\n", name->name);
1313         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1314         dprintk("NFS reply lookup: %d\n", status);
1315         return status;
1316 }
1317
1318 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1319 {
1320         struct nfs4_exception exception = { };
1321         int err;
1322         do {
1323                 err = nfs4_handle_exception(NFS_SERVER(dir),
1324                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1325                                 &exception);
1326         } while (exception.retry);
1327         return err;
1328 }
1329
1330 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1331 {
1332         struct nfs4_accessargs args = {
1333                 .fh = NFS_FH(inode),
1334         };
1335         struct nfs4_accessres res = { 0 };
1336         struct rpc_message msg = {
1337                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1338                 .rpc_argp = &args,
1339                 .rpc_resp = &res,
1340                 .rpc_cred = entry->cred,
1341         };
1342         int mode = entry->mask;
1343         int status;
1344
1345         /*
1346          * Determine which access bits we want to ask for...
1347          */
1348         if (mode & MAY_READ)
1349                 args.access |= NFS4_ACCESS_READ;
1350         if (S_ISDIR(inode->i_mode)) {
1351                 if (mode & MAY_WRITE)
1352                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1353                 if (mode & MAY_EXEC)
1354                         args.access |= NFS4_ACCESS_LOOKUP;
1355         } else {
1356                 if (mode & MAY_WRITE)
1357                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1358                 if (mode & MAY_EXEC)
1359                         args.access |= NFS4_ACCESS_EXECUTE;
1360         }
1361         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1362         if (!status) {
1363                 entry->mask = 0;
1364                 if (res.access & NFS4_ACCESS_READ)
1365                         entry->mask |= MAY_READ;
1366                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1367                         entry->mask |= MAY_WRITE;
1368                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1369                         entry->mask |= MAY_EXEC;
1370         }
1371         return status;
1372 }
1373
1374 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1375 {
1376         struct nfs4_exception exception = { };
1377         int err;
1378         do {
1379                 err = nfs4_handle_exception(NFS_SERVER(inode),
1380                                 _nfs4_proc_access(inode, entry),
1381                                 &exception);
1382         } while (exception.retry);
1383         return err;
1384 }
1385
1386 /*
1387  * TODO: For the time being, we don't try to get any attributes
1388  * along with any of the zero-copy operations READ, READDIR,
1389  * READLINK, WRITE.
1390  *
1391  * In the case of the first three, we want to put the GETATTR
1392  * after the read-type operation -- this is because it is hard
1393  * to predict the length of a GETATTR response in v4, and thus
1394  * align the READ data correctly.  This means that the GETATTR
1395  * may end up partially falling into the page cache, and we should
1396  * shift it into the 'tail' of the xdr_buf before processing.
1397  * To do this efficiently, we need to know the total length
1398  * of data received, which doesn't seem to be available outside
1399  * of the RPC layer.
1400  *
1401  * In the case of WRITE, we also want to put the GETATTR after
1402  * the operation -- in this case because we want to make sure
1403  * we get the post-operation mtime and size.  This means that
1404  * we can't use xdr_encode_pages() as written: we need a variant
1405  * of it which would leave room in the 'tail' iovec.
1406  *
1407  * Both of these changes to the XDR layer would in fact be quite
1408  * minor, but I decided to leave them for a subsequent patch.
1409  */
1410 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1411                 unsigned int pgbase, unsigned int pglen)
1412 {
1413         struct nfs4_readlink args = {
1414                 .fh       = NFS_FH(inode),
1415                 .pgbase   = pgbase,
1416                 .pglen    = pglen,
1417                 .pages    = &page,
1418         };
1419         struct rpc_message msg = {
1420                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1421                 .rpc_argp = &args,
1422                 .rpc_resp = NULL,
1423         };
1424
1425         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1426 }
1427
1428 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1429                 unsigned int pgbase, unsigned int pglen)
1430 {
1431         struct nfs4_exception exception = { };
1432         int err;
1433         do {
1434                 err = nfs4_handle_exception(NFS_SERVER(inode),
1435                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1436                                 &exception);
1437         } while (exception.retry);
1438         return err;
1439 }
1440
1441 static int _nfs4_proc_read(struct nfs_read_data *rdata)
1442 {
1443         int flags = rdata->flags;
1444         struct inode *inode = rdata->inode;
1445         struct nfs_fattr *fattr = rdata->res.fattr;
1446         struct nfs_server *server = NFS_SERVER(inode);
1447         struct rpc_message msg = {
1448                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_READ],
1449                 .rpc_argp       = &rdata->args,
1450                 .rpc_resp       = &rdata->res,
1451                 .rpc_cred       = rdata->cred,
1452         };
1453         unsigned long timestamp = jiffies;
1454         int status;
1455
1456         dprintk("NFS call  read %d @ %Ld\n", rdata->args.count,
1457                         (long long) rdata->args.offset);
1458
1459         fattr->valid = 0;
1460         status = rpc_call_sync(server->client, &msg, flags);
1461         if (!status)
1462                 renew_lease(server, timestamp);
1463         dprintk("NFS reply read: %d\n", status);
1464         return status;
1465 }
1466
1467 static int nfs4_proc_read(struct nfs_read_data *rdata)
1468 {
1469         struct nfs4_exception exception = { };
1470         int err;
1471         do {
1472                 err = nfs4_handle_exception(NFS_SERVER(rdata->inode),
1473                                 _nfs4_proc_read(rdata),
1474                                 &exception);
1475         } while (exception.retry);
1476         return err;
1477 }
1478
1479 static int _nfs4_proc_write(struct nfs_write_data *wdata)
1480 {
1481         int rpcflags = wdata->flags;
1482         struct inode *inode = wdata->inode;
1483         struct nfs_fattr *fattr = wdata->res.fattr;
1484         struct nfs_server *server = NFS_SERVER(inode);
1485         struct rpc_message msg = {
1486                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
1487                 .rpc_argp       = &wdata->args,
1488                 .rpc_resp       = &wdata->res,
1489                 .rpc_cred       = wdata->cred,
1490         };
1491         int status;
1492
1493         dprintk("NFS call  write %d @ %Ld\n", wdata->args.count,
1494                         (long long) wdata->args.offset);
1495
1496         fattr->valid = 0;
1497         status = rpc_call_sync(server->client, &msg, rpcflags);
1498         dprintk("NFS reply write: %d\n", status);
1499         return status;
1500 }
1501
1502 static int nfs4_proc_write(struct nfs_write_data *wdata)
1503 {
1504         struct nfs4_exception exception = { };
1505         int err;
1506         do {
1507                 err = nfs4_handle_exception(NFS_SERVER(wdata->inode),
1508                                 _nfs4_proc_write(wdata),
1509                                 &exception);
1510         } while (exception.retry);
1511         return err;
1512 }
1513
1514 static int _nfs4_proc_commit(struct nfs_write_data *cdata)
1515 {
1516         struct inode *inode = cdata->inode;
1517         struct nfs_fattr *fattr = cdata->res.fattr;
1518         struct nfs_server *server = NFS_SERVER(inode);
1519         struct rpc_message msg = {
1520                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
1521                 .rpc_argp       = &cdata->args,
1522                 .rpc_resp       = &cdata->res,
1523                 .rpc_cred       = cdata->cred,
1524         };
1525         int status;
1526
1527         dprintk("NFS call  commit %d @ %Ld\n", cdata->args.count,
1528                         (long long) cdata->args.offset);
1529
1530         fattr->valid = 0;
1531         status = rpc_call_sync(server->client, &msg, 0);
1532         dprintk("NFS reply commit: %d\n", status);
1533         return status;
1534 }
1535
1536 static int nfs4_proc_commit(struct nfs_write_data *cdata)
1537 {
1538         struct nfs4_exception exception = { };
1539         int err;
1540         do {
1541                 err = nfs4_handle_exception(NFS_SERVER(cdata->inode),
1542                                 _nfs4_proc_commit(cdata),
1543                                 &exception);
1544         } while (exception.retry);
1545         return err;
1546 }
1547
1548 /*
1549  * Got race?
1550  * We will need to arrange for the VFS layer to provide an atomic open.
1551  * Until then, this create/open method is prone to inefficiency and race
1552  * conditions due to the lookup, create, and open VFS calls from sys_open()
1553  * placed on the wire.
1554  *
1555  * Given the above sorry state of affairs, I'm simply sending an OPEN.
1556  * The file will be opened again in the subsequent VFS open call
1557  * (nfs4_proc_file_open).
1558  *
1559  * The open for read will just hang around to be used by any process that
1560  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1561  */
1562
1563 static int
1564 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
1565                  int flags, struct nameidata *nd)
1566 {
1567         struct nfs4_state *state;
1568         struct rpc_cred *cred;
1569         int status = 0;
1570
1571         cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1572         if (IS_ERR(cred)) {
1573                 status = PTR_ERR(cred);
1574                 goto out;
1575         }
1576         state = nfs4_do_open(dir, dentry, flags, sattr, cred);
1577         put_rpccred(cred);
1578         if (IS_ERR(state)) {
1579                 status = PTR_ERR(state);
1580                 goto out;
1581         }
1582         d_instantiate(dentry, state->inode);
1583         if (flags & O_EXCL) {
1584                 struct nfs_fattr fattr;
1585                 status = nfs4_do_setattr(NFS_SERVER(dir), &fattr,
1586                                      NFS_FH(state->inode), sattr, state);
1587                 if (status == 0)
1588                         nfs_setattr_update_inode(state->inode, sattr);
1589         }
1590         if (status == 0 && nd != NULL && (nd->flags & LOOKUP_OPEN))
1591                 nfs4_intent_set_file(nd, dentry, state);
1592         else
1593                 nfs4_close_state(state, flags);
1594 out:
1595         return status;
1596 }
1597
1598 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1599 {
1600         struct nfs4_remove_arg args = {
1601                 .fh = NFS_FH(dir),
1602                 .name = name,
1603         };
1604         struct nfs4_change_info res;
1605         struct rpc_message msg = {
1606                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1607                 .rpc_argp       = &args,
1608                 .rpc_resp       = &res,
1609         };
1610         int                     status;
1611
1612         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1613         if (status == 0)
1614                 update_changeattr(dir, &res);
1615         return status;
1616 }
1617
1618 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1619 {
1620         struct nfs4_exception exception = { };
1621         int err;
1622         do {
1623                 err = nfs4_handle_exception(NFS_SERVER(dir),
1624                                 _nfs4_proc_remove(dir, name),
1625                                 &exception);
1626         } while (exception.retry);
1627         return err;
1628 }
1629
1630 struct unlink_desc {
1631         struct nfs4_remove_arg  args;
1632         struct nfs4_change_info res;
1633 };
1634
1635 static int nfs4_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir,
1636                 struct qstr *name)
1637 {
1638         struct unlink_desc *up;
1639
1640         up = (struct unlink_desc *) kmalloc(sizeof(*up), GFP_KERNEL);
1641         if (!up)
1642                 return -ENOMEM;
1643
1644         up->args.fh = NFS_FH(dir->d_inode);
1645         up->args.name = name;
1646
1647         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1648         msg->rpc_argp = &up->args;
1649         msg->rpc_resp = &up->res;
1650         return 0;
1651 }
1652
1653 static int nfs4_proc_unlink_done(struct dentry *dir, struct rpc_task *task)
1654 {
1655         struct rpc_message *msg = &task->tk_msg;
1656         struct unlink_desc *up;
1657
1658         if (msg->rpc_resp != NULL) {
1659                 up = container_of(msg->rpc_resp, struct unlink_desc, res);
1660                 update_changeattr(dir->d_inode, &up->res);
1661                 kfree(up);
1662                 msg->rpc_resp = NULL;
1663                 msg->rpc_argp = NULL;
1664         }
1665         return 0;
1666 }
1667
1668 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1669                 struct inode *new_dir, struct qstr *new_name)
1670 {
1671         struct nfs4_rename_arg arg = {
1672                 .old_dir = NFS_FH(old_dir),
1673                 .new_dir = NFS_FH(new_dir),
1674                 .old_name = old_name,
1675                 .new_name = new_name,
1676         };
1677         struct nfs4_rename_res res = { };
1678         struct rpc_message msg = {
1679                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
1680                 .rpc_argp = &arg,
1681                 .rpc_resp = &res,
1682         };
1683         int                     status;
1684
1685         status = rpc_call_sync(NFS_CLIENT(old_dir), &msg, 0);
1686
1687         if (!status) {
1688                 update_changeattr(old_dir, &res.old_cinfo);
1689                 update_changeattr(new_dir, &res.new_cinfo);
1690         }
1691         return status;
1692 }
1693
1694 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1695                 struct inode *new_dir, struct qstr *new_name)
1696 {
1697         struct nfs4_exception exception = { };
1698         int err;
1699         do {
1700                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
1701                                 _nfs4_proc_rename(old_dir, old_name,
1702                                         new_dir, new_name),
1703                                 &exception);
1704         } while (exception.retry);
1705         return err;
1706 }
1707
1708 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
1709 {
1710         struct nfs4_link_arg arg = {
1711                 .fh     = NFS_FH(inode),
1712                 .dir_fh = NFS_FH(dir),
1713                 .name   = name,
1714         };
1715         struct nfs4_change_info cinfo = { };
1716         struct rpc_message msg = {
1717                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
1718                 .rpc_argp = &arg,
1719                 .rpc_resp = &cinfo,
1720         };
1721         int                     status;
1722
1723         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1724         if (!status)
1725                 update_changeattr(dir, &cinfo);
1726
1727         return status;
1728 }
1729
1730 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
1731 {
1732         struct nfs4_exception exception = { };
1733         int err;
1734         do {
1735                 err = nfs4_handle_exception(NFS_SERVER(inode),
1736                                 _nfs4_proc_link(inode, dir, name),
1737                                 &exception);
1738         } while (exception.retry);
1739         return err;
1740 }
1741
1742 static int _nfs4_proc_symlink(struct inode *dir, struct qstr *name,
1743                 struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle,
1744                 struct nfs_fattr *fattr)
1745 {
1746         struct nfs_server *server = NFS_SERVER(dir);
1747         struct nfs4_create_arg arg = {
1748                 .dir_fh = NFS_FH(dir),
1749                 .server = server,
1750                 .name = name,
1751                 .attrs = sattr,
1752                 .ftype = NF4LNK,
1753                 .bitmask = server->attr_bitmask,
1754         };
1755         struct nfs4_create_res res = {
1756                 .server = server,
1757                 .fh = fhandle,
1758                 .fattr = fattr,
1759         };
1760         struct rpc_message msg = {
1761                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
1762                 .rpc_argp = &arg,
1763                 .rpc_resp = &res,
1764         };
1765         int                     status;
1766
1767         if (path->len > NFS4_MAXPATHLEN)
1768                 return -ENAMETOOLONG;
1769         arg.u.symlink = path;
1770         fattr->valid = 0;
1771
1772         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1773         if (!status)
1774                 update_changeattr(dir, &res.dir_cinfo);
1775         return status;
1776 }
1777
1778 static int nfs4_proc_symlink(struct inode *dir, struct qstr *name,
1779                 struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle,
1780                 struct nfs_fattr *fattr)
1781 {
1782         struct nfs4_exception exception = { };
1783         int err;
1784         do {
1785                 err = nfs4_handle_exception(NFS_SERVER(dir),
1786                                 _nfs4_proc_symlink(dir, name, path, sattr,
1787                                         fhandle, fattr),
1788                                 &exception);
1789         } while (exception.retry);
1790         return err;
1791 }
1792
1793 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
1794                 struct iattr *sattr)
1795 {
1796         struct nfs_server *server = NFS_SERVER(dir);
1797         struct nfs_fh fhandle;
1798         struct nfs_fattr fattr;
1799         struct nfs4_create_arg arg = {
1800                 .dir_fh = NFS_FH(dir),
1801                 .server = server,
1802                 .name = &dentry->d_name,
1803                 .attrs = sattr,
1804                 .ftype = NF4DIR,
1805                 .bitmask = server->attr_bitmask,
1806         };
1807         struct nfs4_create_res res = {
1808                 .server = server,
1809                 .fh = &fhandle,
1810                 .fattr = &fattr,
1811         };
1812         struct rpc_message msg = {
1813                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
1814                 .rpc_argp = &arg,
1815                 .rpc_resp = &res,
1816         };
1817         int                     status;
1818
1819         fattr.valid = 0;
1820
1821         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1822         if (!status) {
1823                 update_changeattr(dir, &res.dir_cinfo);
1824                 status = nfs_instantiate(dentry, &fhandle, &fattr);
1825         }
1826         return status;
1827 }
1828
1829 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
1830                 struct iattr *sattr)
1831 {
1832         struct nfs4_exception exception = { };
1833         int err;
1834         do {
1835                 err = nfs4_handle_exception(NFS_SERVER(dir),
1836                                 _nfs4_proc_mkdir(dir, dentry, sattr),
1837                                 &exception);
1838         } while (exception.retry);
1839         return err;
1840 }
1841
1842 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
1843                   u64 cookie, struct page *page, unsigned int count, int plus)
1844 {
1845         struct inode            *dir = dentry->d_inode;
1846         struct nfs4_readdir_arg args = {
1847                 .fh = NFS_FH(dir),
1848                 .pages = &page,
1849                 .pgbase = 0,
1850                 .count = count,
1851                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
1852         };
1853         struct nfs4_readdir_res res;
1854         struct rpc_message msg = {
1855                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
1856                 .rpc_argp = &args,
1857                 .rpc_resp = &res,
1858                 .rpc_cred = cred,
1859         };
1860         int                     status;
1861
1862         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
1863                         dentry->d_parent->d_name.name,
1864                         dentry->d_name.name,
1865                         (unsigned long long)cookie);
1866         lock_kernel();
1867         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
1868         res.pgbase = args.pgbase;
1869         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1870         if (status == 0)
1871                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
1872         unlock_kernel();
1873         dprintk("%s: returns %d\n", __FUNCTION__, status);
1874         return status;
1875 }
1876
1877 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
1878                   u64 cookie, struct page *page, unsigned int count, int plus)
1879 {
1880         struct nfs4_exception exception = { };
1881         int err;
1882         do {
1883                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
1884                                 _nfs4_proc_readdir(dentry, cred, cookie,
1885                                         page, count, plus),
1886                                 &exception);
1887         } while (exception.retry);
1888         return err;
1889 }
1890
1891 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
1892                 struct iattr *sattr, dev_t rdev)
1893 {
1894         struct nfs_server *server = NFS_SERVER(dir);
1895         struct nfs_fh fh;
1896         struct nfs_fattr fattr;
1897         struct nfs4_create_arg arg = {
1898                 .dir_fh = NFS_FH(dir),
1899                 .server = server,
1900                 .name = &dentry->d_name,
1901                 .attrs = sattr,
1902                 .bitmask = server->attr_bitmask,
1903         };
1904         struct nfs4_create_res res = {
1905                 .server = server,
1906                 .fh = &fh,
1907                 .fattr = &fattr,
1908         };
1909         struct rpc_message msg = {
1910                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
1911                 .rpc_argp = &arg,
1912                 .rpc_resp = &res,
1913         };
1914         int                     status;
1915         int                     mode = sattr->ia_mode;
1916
1917         fattr.valid = 0;
1918
1919         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
1920         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
1921         if (S_ISFIFO(mode))
1922                 arg.ftype = NF4FIFO;
1923         else if (S_ISBLK(mode)) {
1924                 arg.ftype = NF4BLK;
1925                 arg.u.device.specdata1 = MAJOR(rdev);
1926                 arg.u.device.specdata2 = MINOR(rdev);
1927         }
1928         else if (S_ISCHR(mode)) {
1929                 arg.ftype = NF4CHR;
1930                 arg.u.device.specdata1 = MAJOR(rdev);
1931                 arg.u.device.specdata2 = MINOR(rdev);
1932         }
1933         else
1934                 arg.ftype = NF4SOCK;
1935
1936         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1937         if (status == 0) {
1938                 update_changeattr(dir, &res.dir_cinfo);
1939                 status = nfs_instantiate(dentry, &fh, &fattr);
1940         }
1941         return status;
1942 }
1943
1944 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
1945                 struct iattr *sattr, dev_t rdev)
1946 {
1947         struct nfs4_exception exception = { };
1948         int err;
1949         do {
1950                 err = nfs4_handle_exception(NFS_SERVER(dir),
1951                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
1952                                 &exception);
1953         } while (exception.retry);
1954         return err;
1955 }
1956
1957 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
1958                  struct nfs_fsstat *fsstat)
1959 {
1960         struct nfs4_statfs_arg args = {
1961                 .fh = fhandle,
1962                 .bitmask = server->attr_bitmask,
1963         };
1964         struct rpc_message msg = {
1965                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
1966                 .rpc_argp = &args,
1967                 .rpc_resp = fsstat,
1968         };
1969
1970         fsstat->fattr->valid = 0;
1971         return rpc_call_sync(server->client, &msg, 0);
1972 }
1973
1974 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
1975 {
1976         struct nfs4_exception exception = { };
1977         int err;
1978         do {
1979                 err = nfs4_handle_exception(server,
1980                                 _nfs4_proc_statfs(server, fhandle, fsstat),
1981                                 &exception);
1982         } while (exception.retry);
1983         return err;
1984 }
1985
1986 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
1987                 struct nfs_fsinfo *fsinfo)
1988 {
1989         struct nfs4_fsinfo_arg args = {
1990                 .fh = fhandle,
1991                 .bitmask = server->attr_bitmask,
1992         };
1993         struct rpc_message msg = {
1994                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
1995                 .rpc_argp = &args,
1996                 .rpc_resp = fsinfo,
1997         };
1998
1999         return rpc_call_sync(server->client, &msg, 0);
2000 }
2001
2002 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2003 {
2004         struct nfs4_exception exception = { };
2005         int err;
2006
2007         do {
2008                 err = nfs4_handle_exception(server,
2009                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2010                                 &exception);
2011         } while (exception.retry);
2012         return err;
2013 }
2014
2015 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2016 {
2017         fsinfo->fattr->valid = 0;
2018         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2019 }
2020
2021 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2022                 struct nfs_pathconf *pathconf)
2023 {
2024         struct nfs4_pathconf_arg args = {
2025                 .fh = fhandle,
2026                 .bitmask = server->attr_bitmask,
2027         };
2028         struct rpc_message msg = {
2029                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2030                 .rpc_argp = &args,
2031                 .rpc_resp = pathconf,
2032         };
2033
2034         /* None of the pathconf attributes are mandatory to implement */
2035         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2036                 memset(pathconf, 0, sizeof(*pathconf));
2037                 return 0;
2038         }
2039
2040         pathconf->fattr->valid = 0;
2041         return rpc_call_sync(server->client, &msg, 0);
2042 }
2043
2044 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2045                 struct nfs_pathconf *pathconf)
2046 {
2047         struct nfs4_exception exception = { };
2048         int err;
2049
2050         do {
2051                 err = nfs4_handle_exception(server,
2052                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2053                                 &exception);
2054         } while (exception.retry);
2055         return err;
2056 }
2057
2058 static void
2059 nfs4_read_done(struct rpc_task *task)
2060 {
2061         struct nfs_read_data *data = (struct nfs_read_data *) task->tk_calldata;
2062         struct inode *inode = data->inode;
2063
2064         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2065                 rpc_restart_call(task);
2066                 return;
2067         }
2068         if (task->tk_status > 0)
2069                 renew_lease(NFS_SERVER(inode), data->timestamp);
2070         /* Call back common NFS readpage processing */
2071         nfs_readpage_result(task);
2072 }
2073
2074 static void
2075 nfs4_proc_read_setup(struct nfs_read_data *data)
2076 {
2077         struct rpc_task *task = &data->task;
2078         struct rpc_message msg = {
2079                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
2080                 .rpc_argp = &data->args,
2081                 .rpc_resp = &data->res,
2082                 .rpc_cred = data->cred,
2083         };
2084         struct inode *inode = data->inode;
2085         int flags;
2086
2087         data->timestamp   = jiffies;
2088
2089         /* N.B. Do we need to test? Never called for swapfile inode */
2090         flags = RPC_TASK_ASYNC | (IS_SWAPFILE(inode)? NFS_RPC_SWAPFLAGS : 0);
2091
2092         /* Finalize the task. */
2093         rpc_init_task(task, NFS_CLIENT(inode), nfs4_read_done, flags);
2094         rpc_call_setup(task, &msg, 0);
2095 }
2096
2097 static void
2098 nfs4_write_done(struct rpc_task *task)
2099 {
2100         struct nfs_write_data *data = (struct nfs_write_data *) task->tk_calldata;
2101         struct inode *inode = data->inode;
2102
2103         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2104                 rpc_restart_call(task);
2105                 return;
2106         }
2107         if (task->tk_status >= 0)
2108                 renew_lease(NFS_SERVER(inode), data->timestamp);
2109         /* Call back common NFS writeback processing */
2110         nfs_writeback_done(task);
2111 }
2112
2113 static void
2114 nfs4_proc_write_setup(struct nfs_write_data *data, int how)
2115 {
2116         struct rpc_task *task = &data->task;
2117         struct rpc_message msg = {
2118                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
2119                 .rpc_argp = &data->args,
2120                 .rpc_resp = &data->res,
2121                 .rpc_cred = data->cred,
2122         };
2123         struct inode *inode = data->inode;
2124         int stable;
2125         int flags;
2126
2127         if (how & FLUSH_STABLE) {
2128                 if (!NFS_I(inode)->ncommit)
2129                         stable = NFS_FILE_SYNC;
2130                 else
2131                         stable = NFS_DATA_SYNC;
2132         } else
2133                 stable = NFS_UNSTABLE;
2134         data->args.stable = stable;
2135
2136         data->timestamp   = jiffies;
2137
2138         /* Set the initial flags for the task.  */
2139         flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
2140
2141         /* Finalize the task. */
2142         rpc_init_task(task, NFS_CLIENT(inode), nfs4_write_done, flags);
2143         rpc_call_setup(task, &msg, 0);
2144 }
2145
2146 static void
2147 nfs4_commit_done(struct rpc_task *task)
2148 {
2149         struct nfs_write_data *data = (struct nfs_write_data *) task->tk_calldata;
2150         struct inode *inode = data->inode;
2151
2152         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2153                 rpc_restart_call(task);
2154                 return;
2155         }
2156         /* Call back common NFS writeback processing */
2157         nfs_commit_done(task);
2158 }
2159
2160 static void
2161 nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
2162 {
2163         struct rpc_task *task = &data->task;
2164         struct rpc_message msg = {
2165                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2166                 .rpc_argp = &data->args,
2167                 .rpc_resp = &data->res,
2168                 .rpc_cred = data->cred,
2169         };
2170         struct inode *inode = data->inode;
2171         int flags;
2172
2173         /* Set the initial flags for the task.  */
2174         flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
2175
2176         /* Finalize the task. */
2177         rpc_init_task(task, NFS_CLIENT(inode), nfs4_commit_done, flags);
2178         rpc_call_setup(task, &msg, 0);
2179 }
2180
2181 /*
2182  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2183  * standalone procedure for queueing an asynchronous RENEW.
2184  */
2185 static void
2186 renew_done(struct rpc_task *task)
2187 {
2188         struct nfs4_client *clp = (struct nfs4_client *)task->tk_msg.rpc_argp;
2189         unsigned long timestamp = (unsigned long)task->tk_calldata;
2190
2191         if (task->tk_status < 0) {
2192                 switch (task->tk_status) {
2193                         case -NFS4ERR_STALE_CLIENTID:
2194                         case -NFS4ERR_EXPIRED:
2195                         case -NFS4ERR_CB_PATH_DOWN:
2196                                 nfs4_schedule_state_recovery(clp);
2197                 }
2198                 return;
2199         }
2200         spin_lock(&clp->cl_lock);
2201         if (time_before(clp->cl_last_renewal,timestamp))
2202                 clp->cl_last_renewal = timestamp;
2203         spin_unlock(&clp->cl_lock);
2204 }
2205
2206 int
2207 nfs4_proc_async_renew(struct nfs4_client *clp)
2208 {
2209         struct rpc_message msg = {
2210                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2211                 .rpc_argp       = clp,
2212                 .rpc_cred       = clp->cl_cred,
2213         };
2214
2215         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2216                         renew_done, (void *)jiffies);
2217 }
2218
2219 int
2220 nfs4_proc_renew(struct nfs4_client *clp)
2221 {
2222         struct rpc_message msg = {
2223                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2224                 .rpc_argp       = clp,
2225                 .rpc_cred       = clp->cl_cred,
2226         };
2227         unsigned long now = jiffies;
2228         int status;
2229
2230         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2231         if (status < 0)
2232                 return status;
2233         spin_lock(&clp->cl_lock);
2234         if (time_before(clp->cl_last_renewal,now))
2235                 clp->cl_last_renewal = now;
2236         spin_unlock(&clp->cl_lock);
2237         return 0;
2238 }
2239
2240 static inline int nfs4_server_supports_acls(struct nfs_server *server)
2241 {
2242         return (server->caps & NFS_CAP_ACLS)
2243                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2244                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2245 }
2246
2247 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2248  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2249  * the stack.
2250  */
2251 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2252
2253 static void buf_to_pages(const void *buf, size_t buflen,
2254                 struct page **pages, unsigned int *pgbase)
2255 {
2256         const void *p = buf;
2257
2258         *pgbase = offset_in_page(buf);
2259         p -= *pgbase;
2260         while (p < buf + buflen) {
2261                 *(pages++) = virt_to_page(p);
2262                 p += PAGE_CACHE_SIZE;
2263         }
2264 }
2265
2266 struct nfs4_cached_acl {
2267         int cached;
2268         size_t len;
2269         char data[0];
2270 };
2271
2272 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2273 {
2274         struct nfs_inode *nfsi = NFS_I(inode);
2275
2276         spin_lock(&inode->i_lock);
2277         kfree(nfsi->nfs4_acl);
2278         nfsi->nfs4_acl = acl;
2279         spin_unlock(&inode->i_lock);
2280 }
2281
2282 static void nfs4_zap_acl_attr(struct inode *inode)
2283 {
2284         nfs4_set_cached_acl(inode, NULL);
2285 }
2286
2287 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2288 {
2289         struct nfs_inode *nfsi = NFS_I(inode);
2290         struct nfs4_cached_acl *acl;
2291         int ret = -ENOENT;
2292
2293         spin_lock(&inode->i_lock);
2294         acl = nfsi->nfs4_acl;
2295         if (acl == NULL)
2296                 goto out;
2297         if (buf == NULL) /* user is just asking for length */
2298                 goto out_len;
2299         if (acl->cached == 0)
2300                 goto out;
2301         ret = -ERANGE; /* see getxattr(2) man page */
2302         if (acl->len > buflen)
2303                 goto out;
2304         memcpy(buf, acl->data, acl->len);
2305 out_len:
2306         ret = acl->len;
2307 out:
2308         spin_unlock(&inode->i_lock);
2309         return ret;
2310 }
2311
2312 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2313 {
2314         struct nfs4_cached_acl *acl;
2315
2316         if (buf && acl_len <= PAGE_SIZE) {
2317                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2318                 if (acl == NULL)
2319                         goto out;
2320                 acl->cached = 1;
2321                 memcpy(acl->data, buf, acl_len);
2322         } else {
2323                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2324                 if (acl == NULL)
2325                         goto out;
2326                 acl->cached = 0;
2327         }
2328         acl->len = acl_len;
2329 out:
2330         nfs4_set_cached_acl(inode, acl);
2331 }
2332
2333 static inline ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2334 {
2335         struct page *pages[NFS4ACL_MAXPAGES];
2336         struct nfs_getaclargs args = {
2337                 .fh = NFS_FH(inode),
2338                 .acl_pages = pages,
2339                 .acl_len = buflen,
2340         };
2341         size_t resp_len = buflen;
2342         void *resp_buf;
2343         struct rpc_message msg = {
2344                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2345                 .rpc_argp = &args,
2346                 .rpc_resp = &resp_len,
2347         };
2348         struct page *localpage = NULL;
2349         int ret;
2350
2351         if (buflen < PAGE_SIZE) {
2352                 /* As long as we're doing a round trip to the server anyway,
2353                  * let's be prepared for a page of acl data. */
2354                 localpage = alloc_page(GFP_KERNEL);
2355                 resp_buf = page_address(localpage);
2356                 if (localpage == NULL)
2357                         return -ENOMEM;
2358                 args.acl_pages[0] = localpage;
2359                 args.acl_pgbase = 0;
2360                 args.acl_len = PAGE_SIZE;
2361         } else {
2362                 resp_buf = buf;
2363                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2364         }
2365         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2366         if (ret)
2367                 goto out_free;
2368         if (resp_len > args.acl_len)
2369                 nfs4_write_cached_acl(inode, NULL, resp_len);
2370         else
2371                 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2372         if (buf) {
2373                 ret = -ERANGE;
2374                 if (resp_len > buflen)
2375                         goto out_free;
2376                 if (localpage)
2377                         memcpy(buf, resp_buf, resp_len);
2378         }
2379         ret = resp_len;
2380 out_free:
2381         if (localpage)
2382                 __free_page(localpage);
2383         return ret;
2384 }
2385
2386 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2387 {
2388         struct nfs_server *server = NFS_SERVER(inode);
2389         int ret;
2390
2391         if (!nfs4_server_supports_acls(server))
2392                 return -EOPNOTSUPP;
2393         ret = nfs_revalidate_inode(server, inode);
2394         if (ret < 0)
2395                 return ret;
2396         ret = nfs4_read_cached_acl(inode, buf, buflen);
2397         if (ret != -ENOENT)
2398                 return ret;
2399         return nfs4_get_acl_uncached(inode, buf, buflen);
2400 }
2401
2402 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2403 {
2404         struct nfs_server *server = NFS_SERVER(inode);
2405         struct page *pages[NFS4ACL_MAXPAGES];
2406         struct nfs_setaclargs arg = {
2407                 .fh             = NFS_FH(inode),
2408                 .acl_pages      = pages,
2409                 .acl_len        = buflen,
2410         };
2411         struct rpc_message msg = {
2412                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2413                 .rpc_argp       = &arg,
2414                 .rpc_resp       = NULL,
2415         };
2416         int ret;
2417
2418         if (!nfs4_server_supports_acls(server))
2419                 return -EOPNOTSUPP;
2420         nfs_inode_return_delegation(inode);
2421         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2422         ret = rpc_call_sync(NFS_SERVER(inode)->client, &msg, 0);
2423         if (ret == 0)
2424                 nfs4_write_cached_acl(inode, buf, buflen);
2425         return ret;
2426 }
2427
2428 static int
2429 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
2430 {
2431         struct nfs4_client *clp = server->nfs4_state;
2432
2433         if (!clp || task->tk_status >= 0)
2434                 return 0;
2435         switch(task->tk_status) {
2436                 case -NFS4ERR_STALE_CLIENTID:
2437                 case -NFS4ERR_STALE_STATEID:
2438                 case -NFS4ERR_EXPIRED:
2439                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2440                         nfs4_schedule_state_recovery(clp);
2441                         if (test_bit(NFS4CLNT_OK, &clp->cl_state))
2442                                 rpc_wake_up_task(task);
2443                         task->tk_status = 0;
2444                         return -EAGAIN;
2445                 case -NFS4ERR_GRACE:
2446                 case -NFS4ERR_DELAY:
2447                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
2448                         task->tk_status = 0;
2449                         return -EAGAIN;
2450                 case -NFS4ERR_OLD_STATEID:
2451                         task->tk_status = 0;
2452                         return -EAGAIN;
2453         }
2454         task->tk_status = nfs4_map_errors(task->tk_status);
2455         return 0;
2456 }
2457
2458 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs4_client *clp)
2459 {
2460         DEFINE_WAIT(wait);
2461         sigset_t oldset;
2462         int interruptible, res = 0;
2463
2464         might_sleep();
2465
2466         rpc_clnt_sigmask(clnt, &oldset);
2467         interruptible = TASK_UNINTERRUPTIBLE;
2468         if (clnt->cl_intr)
2469                 interruptible = TASK_INTERRUPTIBLE;
2470         prepare_to_wait(&clp->cl_waitq, &wait, interruptible);
2471         nfs4_schedule_state_recovery(clp);
2472         if (clnt->cl_intr && signalled())
2473                 res = -ERESTARTSYS;
2474         else if (!test_bit(NFS4CLNT_OK, &clp->cl_state))
2475                 schedule();
2476         finish_wait(&clp->cl_waitq, &wait);
2477         rpc_clnt_sigunmask(clnt, &oldset);
2478         return res;
2479 }
2480
2481 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2482 {
2483         sigset_t oldset;
2484         int res = 0;
2485
2486         might_sleep();
2487
2488         if (*timeout <= 0)
2489                 *timeout = NFS4_POLL_RETRY_MIN;
2490         if (*timeout > NFS4_POLL_RETRY_MAX)
2491                 *timeout = NFS4_POLL_RETRY_MAX;
2492         rpc_clnt_sigmask(clnt, &oldset);
2493         if (clnt->cl_intr) {
2494                 schedule_timeout_interruptible(*timeout);
2495                 if (signalled())
2496                         res = -ERESTARTSYS;
2497         } else
2498                 schedule_timeout_uninterruptible(*timeout);
2499         rpc_clnt_sigunmask(clnt, &oldset);
2500         *timeout <<= 1;
2501         return res;
2502 }
2503
2504 /* This is the error handling routine for processes that are allowed
2505  * to sleep.
2506  */
2507 int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
2508 {
2509         struct nfs4_client *clp = server->nfs4_state;
2510         int ret = errorcode;
2511
2512         exception->retry = 0;
2513         switch(errorcode) {
2514                 case 0:
2515                         return 0;
2516                 case -NFS4ERR_STALE_CLIENTID:
2517                 case -NFS4ERR_STALE_STATEID:
2518                 case -NFS4ERR_EXPIRED:
2519                         ret = nfs4_wait_clnt_recover(server->client, clp);
2520                         if (ret == 0)
2521                                 exception->retry = 1;
2522                         break;
2523                 case -NFS4ERR_GRACE:
2524                 case -NFS4ERR_DELAY:
2525                         ret = nfs4_delay(server->client, &exception->timeout);
2526                         if (ret == 0)
2527                                 exception->retry = 1;
2528                         break;
2529                 case -NFS4ERR_OLD_STATEID:
2530                         if (ret == 0)
2531                                 exception->retry = 1;
2532         }
2533         /* We failed to handle the error */
2534         return nfs4_map_errors(ret);
2535 }
2536
2537 int nfs4_proc_setclientid(struct nfs4_client *clp, u32 program, unsigned short port)
2538 {
2539         nfs4_verifier sc_verifier;
2540         struct nfs4_setclientid setclientid = {
2541                 .sc_verifier = &sc_verifier,
2542                 .sc_prog = program,
2543         };
2544         struct rpc_message msg = {
2545                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2546                 .rpc_argp = &setclientid,
2547                 .rpc_resp = clp,
2548                 .rpc_cred = clp->cl_cred,
2549         };
2550         u32 *p;
2551         int loop = 0;
2552         int status;
2553
2554         p = (u32*)sc_verifier.data;
2555         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2556         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2557
2558         for(;;) {
2559                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2560                                 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
2561                                 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.s_addr),
2562                                 clp->cl_cred->cr_ops->cr_name,
2563                                 clp->cl_id_uniquifier);
2564                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2565                                 sizeof(setclientid.sc_netid), "tcp");
2566                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2567                                 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2568                                 clp->cl_ipaddr, port >> 8, port & 255);
2569
2570                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2571                 if (status != -NFS4ERR_CLID_INUSE)
2572                         break;
2573                 if (signalled())
2574                         break;
2575                 if (loop++ & 1)
2576                         ssleep(clp->cl_lease_time + 1);
2577                 else
2578                         if (++clp->cl_id_uniquifier == 0)
2579                                 break;
2580         }
2581         return status;
2582 }
2583
2584 int
2585 nfs4_proc_setclientid_confirm(struct nfs4_client *clp)
2586 {
2587         struct nfs_fsinfo fsinfo;
2588         struct rpc_message msg = {
2589                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2590                 .rpc_argp = clp,
2591                 .rpc_resp = &fsinfo,
2592                 .rpc_cred = clp->cl_cred,
2593         };
2594         unsigned long now;
2595         int status;
2596
2597         now = jiffies;
2598         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2599         if (status == 0) {
2600                 spin_lock(&clp->cl_lock);
2601                 clp->cl_lease_time = fsinfo.lease_time * HZ;
2602                 clp->cl_last_renewal = now;
2603                 spin_unlock(&clp->cl_lock);
2604         }
2605         return status;
2606 }
2607
2608 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2609 {
2610         struct nfs4_delegreturnargs args = {
2611                 .fhandle = NFS_FH(inode),
2612                 .stateid = stateid,
2613         };
2614         struct rpc_message msg = {
2615                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
2616                 .rpc_argp = &args,
2617                 .rpc_cred = cred,
2618         };
2619
2620         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2621 }
2622
2623 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2624 {
2625         struct nfs_server *server = NFS_SERVER(inode);
2626         struct nfs4_exception exception = { };
2627         int err;
2628         do {
2629                 err = _nfs4_proc_delegreturn(inode, cred, stateid);
2630                 switch (err) {
2631                         case -NFS4ERR_STALE_STATEID:
2632                         case -NFS4ERR_EXPIRED:
2633                                 nfs4_schedule_state_recovery(server->nfs4_state);
2634                         case 0:
2635                                 return 0;
2636                 }
2637                 err = nfs4_handle_exception(server, err, &exception);
2638         } while (exception.retry);
2639         return err;
2640 }
2641
2642 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
2643 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
2644
2645 /*
2646  * sleep, with exponential backoff, and retry the LOCK operation.
2647  */
2648 static unsigned long
2649 nfs4_set_lock_task_retry(unsigned long timeout)
2650 {
2651         schedule_timeout_interruptible(timeout);
2652         timeout <<= 1;
2653         if (timeout > NFS4_LOCK_MAXTIMEOUT)
2654                 return NFS4_LOCK_MAXTIMEOUT;
2655         return timeout;
2656 }
2657
2658 static inline int
2659 nfs4_lck_type(int cmd, struct file_lock *request)
2660 {
2661         /* set lock type */
2662         switch (request->fl_type) {
2663                 case F_RDLCK:
2664                         return IS_SETLKW(cmd) ? NFS4_READW_LT : NFS4_READ_LT;
2665                 case F_WRLCK:
2666                         return IS_SETLKW(cmd) ? NFS4_WRITEW_LT : NFS4_WRITE_LT;
2667                 case F_UNLCK:
2668                         return NFS4_WRITE_LT;
2669         }
2670         BUG();
2671         return 0;
2672 }
2673
2674 static inline uint64_t
2675 nfs4_lck_length(struct file_lock *request)
2676 {
2677         if (request->fl_end == OFFSET_MAX)
2678                 return ~(uint64_t)0;
2679         return request->fl_end - request->fl_start + 1;
2680 }
2681
2682 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
2683 {
2684         struct inode *inode = state->inode;
2685         struct nfs_server *server = NFS_SERVER(inode);
2686         struct nfs4_client *clp = server->nfs4_state;
2687         struct nfs_lockargs arg = {
2688                 .fh = NFS_FH(inode),
2689                 .type = nfs4_lck_type(cmd, request),
2690                 .offset = request->fl_start,
2691                 .length = nfs4_lck_length(request),
2692         };
2693         struct nfs_lockres res = {
2694                 .server = server,
2695         };
2696         struct rpc_message msg = {
2697                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
2698                 .rpc_argp       = &arg,
2699                 .rpc_resp       = &res,
2700                 .rpc_cred       = state->owner->so_cred,
2701         };
2702         struct nfs_lowner nlo;
2703         struct nfs4_lock_state *lsp;
2704         int status;
2705
2706         down_read(&clp->cl_sem);
2707         nlo.clientid = clp->cl_clientid;
2708         status = nfs4_set_lock_state(state, request);
2709         if (status != 0)
2710                 goto out;
2711         lsp = request->fl_u.nfs4_fl.owner;
2712         nlo.id = lsp->ls_id;
2713         arg.u.lockt = &nlo;
2714         status = rpc_call_sync(server->client, &msg, 0);
2715         if (!status) {
2716                 request->fl_type = F_UNLCK;
2717         } else if (status == -NFS4ERR_DENIED) {
2718                 int64_t len, start, end;
2719                 start = res.u.denied.offset;
2720                 len = res.u.denied.length;
2721                 end = start + len - 1;
2722                 if (end < 0 || len == 0)
2723                         request->fl_end = OFFSET_MAX;
2724                 else
2725                         request->fl_end = (loff_t)end;
2726                 request->fl_start = (loff_t)start;
2727                 request->fl_type = F_WRLCK;
2728                 if (res.u.denied.type & 1)
2729                         request->fl_type = F_RDLCK;
2730                 request->fl_pid = 0;
2731                 status = 0;
2732         }
2733 out:
2734         up_read(&clp->cl_sem);
2735         return status;
2736 }
2737
2738 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
2739 {
2740         struct nfs4_exception exception = { };
2741         int err;
2742
2743         do {
2744                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
2745                                 _nfs4_proc_getlk(state, cmd, request),
2746                                 &exception);
2747         } while (exception.retry);
2748         return err;
2749 }
2750
2751 static int do_vfs_lock(struct file *file, struct file_lock *fl)
2752 {
2753         int res = 0;
2754         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
2755                 case FL_POSIX:
2756                         res = posix_lock_file_wait(file, fl);
2757                         break;
2758                 case FL_FLOCK:
2759                         res = flock_lock_file_wait(file, fl);
2760                         break;
2761                 default:
2762                         BUG();
2763         }
2764         if (res < 0)
2765                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n",
2766                                 __FUNCTION__);
2767         return res;
2768 }
2769
2770 struct nfs4_unlockdata {
2771         struct nfs_lockargs arg;
2772         struct nfs_locku_opargs luargs;
2773         struct nfs_lockres res;
2774         struct nfs4_lock_state *lsp;
2775         struct nfs_open_context *ctx;
2776         atomic_t refcount;
2777         struct completion completion;
2778 };
2779
2780 static void nfs4_locku_release_calldata(struct nfs4_unlockdata *calldata)
2781 {
2782         if (atomic_dec_and_test(&calldata->refcount)) {
2783                 nfs_free_seqid(calldata->luargs.seqid);
2784                 nfs4_put_lock_state(calldata->lsp);
2785                 put_nfs_open_context(calldata->ctx);
2786                 kfree(calldata);
2787         }
2788 }
2789
2790 static void nfs4_locku_complete(struct nfs4_unlockdata *calldata)
2791 {
2792         complete(&calldata->completion);
2793         nfs4_locku_release_calldata(calldata);
2794 }
2795
2796 static void nfs4_locku_done(struct rpc_task *task)
2797 {
2798         struct nfs4_unlockdata *calldata = (struct nfs4_unlockdata *)task->tk_calldata;
2799
2800         nfs_increment_lock_seqid(task->tk_status, calldata->luargs.seqid);
2801         switch (task->tk_status) {
2802                 case 0:
2803                         memcpy(calldata->lsp->ls_stateid.data,
2804                                         calldata->res.u.stateid.data,
2805                                         sizeof(calldata->lsp->ls_stateid.data));
2806                         break;
2807                 case -NFS4ERR_STALE_STATEID:
2808                 case -NFS4ERR_EXPIRED:
2809                         nfs4_schedule_state_recovery(calldata->res.server->nfs4_state);
2810                         break;
2811                 default:
2812                         if (nfs4_async_handle_error(task, calldata->res.server) == -EAGAIN) {
2813                                 rpc_restart_call(task);
2814                                 return;
2815                         }
2816         }
2817         nfs4_locku_complete(calldata);
2818 }
2819
2820 static void nfs4_locku_begin(struct rpc_task *task)
2821 {
2822         struct nfs4_unlockdata *calldata = (struct nfs4_unlockdata *)task->tk_calldata;
2823         struct rpc_message msg = {
2824                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
2825                 .rpc_argp       = &calldata->arg,
2826                 .rpc_resp       = &calldata->res,
2827                 .rpc_cred       = calldata->lsp->ls_state->owner->so_cred,
2828         };
2829         int status;
2830
2831         status = nfs_wait_on_sequence(calldata->luargs.seqid, task);
2832         if (status != 0)
2833                 return;
2834         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
2835                 nfs4_locku_complete(calldata);
2836                 task->tk_exit = NULL;
2837                 rpc_exit(task, 0);
2838                 return;
2839         }
2840         rpc_call_setup(task, &msg, 0);
2841 }
2842
2843 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
2844 {
2845         struct nfs4_unlockdata *calldata;
2846         struct inode *inode = state->inode;
2847         struct nfs_server *server = NFS_SERVER(inode);
2848         struct nfs4_lock_state *lsp;
2849         int status;
2850
2851         status = nfs4_set_lock_state(state, request);
2852         if (status != 0)
2853                 return status;
2854         lsp = request->fl_u.nfs4_fl.owner;
2855         /* We might have lost the locks! */
2856         if ((lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0)
2857                 return 0;
2858         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
2859         if (calldata == NULL)
2860                 return -ENOMEM;
2861         calldata->luargs.seqid = nfs_alloc_seqid(&lsp->ls_seqid);
2862         if (calldata->luargs.seqid == NULL) {
2863                 kfree(calldata);
2864                 return -ENOMEM;
2865         }
2866         calldata->luargs.stateid = &lsp->ls_stateid;
2867         calldata->arg.fh = NFS_FH(inode);
2868         calldata->arg.type = nfs4_lck_type(cmd, request);
2869         calldata->arg.offset = request->fl_start;
2870         calldata->arg.length = nfs4_lck_length(request);
2871         calldata->arg.u.locku = &calldata->luargs;
2872         calldata->res.server = server;
2873         calldata->lsp = lsp;
2874         atomic_inc(&lsp->ls_count);
2875
2876         /* Ensure we don't close file until we're done freeing locks! */
2877         calldata->ctx = get_nfs_open_context((struct nfs_open_context*)request->fl_file->private_data);
2878
2879         atomic_set(&calldata->refcount, 2);
2880         init_completion(&calldata->completion);
2881
2882         status = nfs4_call_async(NFS_SERVER(inode)->client, nfs4_locku_begin,
2883                         nfs4_locku_done, calldata);
2884         if (status == 0)
2885                 wait_for_completion_interruptible(&calldata->completion);
2886         do_vfs_lock(request->fl_file, request);
2887         nfs4_locku_release_calldata(calldata);
2888         return status;
2889 }
2890
2891 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *request, int reclaim)
2892 {
2893         struct inode *inode = state->inode;
2894         struct nfs_server *server = NFS_SERVER(inode);
2895         struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner;
2896         struct nfs_lock_opargs largs = {
2897                 .lock_stateid = &lsp->ls_stateid,
2898                 .open_stateid = &state->stateid,
2899                 .lock_owner = {
2900                         .clientid = server->nfs4_state->cl_clientid,
2901                         .id = lsp->ls_id,
2902                 },
2903                 .reclaim = reclaim,
2904         };
2905         struct nfs_lockargs arg = {
2906                 .fh = NFS_FH(inode),
2907                 .type = nfs4_lck_type(cmd, request),
2908                 .offset = request->fl_start,
2909                 .length = nfs4_lck_length(request),
2910                 .u = {
2911                         .lock = &largs,
2912                 },
2913         };
2914         struct nfs_lockres res = {
2915                 .server = server,
2916         };
2917         struct rpc_message msg = {
2918                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
2919                 .rpc_argp       = &arg,
2920                 .rpc_resp       = &res,
2921                 .rpc_cred       = state->owner->so_cred,
2922         };
2923         int status = -ENOMEM;
2924
2925         largs.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
2926         if (largs.lock_seqid == NULL)
2927                 return -ENOMEM;
2928         if (!(lsp->ls_seqid.flags & NFS_SEQID_CONFIRMED)) {
2929                 struct nfs4_state_owner *owner = state->owner;
2930
2931                 largs.open_seqid = nfs_alloc_seqid(&owner->so_seqid);
2932                 if (largs.open_seqid == NULL)
2933                         goto out;
2934                 largs.new_lock_owner = 1;
2935                 status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
2936                 /* increment open seqid on success, and seqid mutating errors */
2937                 if (largs.new_lock_owner != 0) {
2938                         nfs_increment_open_seqid(status, largs.open_seqid);
2939                         if (status == 0)
2940                                 nfs_confirm_seqid(&lsp->ls_seqid, 0);
2941                 }
2942                 nfs_free_seqid(largs.open_seqid);
2943         } else
2944                 status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
2945         /* increment lock seqid on success, and seqid mutating errors*/
2946         nfs_increment_lock_seqid(status, largs.lock_seqid);
2947         /* save the returned stateid. */
2948         if (status == 0) {
2949                 memcpy(lsp->ls_stateid.data, res.u.stateid.data,
2950                                 sizeof(lsp->ls_stateid.data));
2951                 lsp->ls_flags |= NFS_LOCK_INITIALIZED;
2952         } else if (status == -NFS4ERR_DENIED)
2953                 status = -EAGAIN;
2954 out:
2955         nfs_free_seqid(largs.lock_seqid);
2956         return status;
2957 }
2958
2959 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
2960 {
2961         struct nfs_server *server = NFS_SERVER(state->inode);
2962         struct nfs4_exception exception = { };
2963         int err;
2964
2965         do {
2966                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
2967                 if (err != -NFS4ERR_DELAY)
2968                         break;
2969                 nfs4_handle_exception(server, err, &exception);
2970         } while (exception.retry);
2971         return err;
2972 }
2973
2974 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
2975 {
2976         struct nfs_server *server = NFS_SERVER(state->inode);
2977         struct nfs4_exception exception = { };
2978         int err;
2979
2980         do {
2981                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
2982                 if (err != -NFS4ERR_DELAY)
2983                         break;
2984                 nfs4_handle_exception(server, err, &exception);
2985         } while (exception.retry);
2986         return err;
2987 }
2988
2989 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
2990 {
2991         struct nfs4_client *clp = state->owner->so_client;
2992         int status;
2993
2994         down_read(&clp->cl_sem);
2995         status = nfs4_set_lock_state(state, request);
2996         if (status == 0)
2997                 status = _nfs4_do_setlk(state, cmd, request, 0);
2998         if (status == 0) {
2999                 /* Note: we always want to sleep here! */
3000                 request->fl_flags |= FL_SLEEP;
3001                 if (do_vfs_lock(request->fl_file, request) < 0)
3002                         printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
3003         }
3004         up_read(&clp->cl_sem);
3005         return status;
3006 }
3007
3008 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3009 {
3010         struct nfs4_exception exception = { };
3011         int err;
3012
3013         do {
3014                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3015                                 _nfs4_proc_setlk(state, cmd, request),
3016                                 &exception);
3017         } while (exception.retry);
3018         return err;
3019 }
3020
3021 static int
3022 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3023 {
3024         struct nfs_open_context *ctx;
3025         struct nfs4_state *state;
3026         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3027         int status;
3028
3029         /* verify open state */
3030         ctx = (struct nfs_open_context *)filp->private_data;
3031         state = ctx->state;
3032
3033         if (request->fl_start < 0 || request->fl_end < 0)
3034                 return -EINVAL;
3035
3036         if (IS_GETLK(cmd))
3037                 return nfs4_proc_getlk(state, F_GETLK, request);
3038
3039         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3040                 return -EINVAL;
3041
3042         if (request->fl_type == F_UNLCK)
3043                 return nfs4_proc_unlck(state, cmd, request);
3044
3045         do {
3046                 status = nfs4_proc_setlk(state, cmd, request);
3047                 if ((status != -EAGAIN) || IS_SETLK(cmd))
3048                         break;
3049                 timeout = nfs4_set_lock_task_retry(timeout);
3050                 status = -ERESTARTSYS;
3051                 if (signalled())
3052                         break;
3053         } while(status < 0);
3054         return status;
3055 }
3056
3057
3058 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3059
3060 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3061                 size_t buflen, int flags)
3062 {
3063         struct inode *inode = dentry->d_inode;
3064
3065         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3066                 return -EOPNOTSUPP;
3067
3068         if (!S_ISREG(inode->i_mode) &&
3069             (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
3070                 return -EPERM;
3071
3072         return nfs4_proc_set_acl(inode, buf, buflen);
3073 }
3074
3075 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
3076  * and that's what we'll do for e.g. user attributes that haven't been set.
3077  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3078  * attributes in kernel-managed attribute namespaces. */
3079 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3080                 size_t buflen)
3081 {
3082         struct inode *inode = dentry->d_inode;
3083
3084         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3085                 return -EOPNOTSUPP;
3086
3087         return nfs4_proc_get_acl(inode, buf, buflen);
3088 }
3089
3090 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3091 {
3092         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
3093
3094         if (buf && buflen < len)
3095                 return -ERANGE;
3096         if (buf)
3097                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3098         return len;
3099 }
3100
3101 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3102         .recover_open   = nfs4_open_reclaim,
3103         .recover_lock   = nfs4_lock_reclaim,
3104 };
3105
3106 struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3107         .recover_open   = nfs4_open_expired,
3108         .recover_lock   = nfs4_lock_expired,
3109 };
3110
3111 static struct inode_operations nfs4_file_inode_operations = {
3112         .permission     = nfs_permission,
3113         .getattr        = nfs_getattr,
3114         .setattr        = nfs_setattr,
3115         .getxattr       = nfs4_getxattr,
3116         .setxattr       = nfs4_setxattr,
3117         .listxattr      = nfs4_listxattr,
3118 };
3119
3120 struct nfs_rpc_ops      nfs_v4_clientops = {
3121         .version        = 4,                    /* protocol version */
3122         .dentry_ops     = &nfs4_dentry_operations,
3123         .dir_inode_ops  = &nfs4_dir_inode_operations,
3124         .file_inode_ops = &nfs4_file_inode_operations,
3125         .getroot        = nfs4_proc_get_root,
3126         .getattr        = nfs4_proc_getattr,
3127         .setattr        = nfs4_proc_setattr,
3128         .lookup         = nfs4_proc_lookup,
3129         .access         = nfs4_proc_access,
3130         .readlink       = nfs4_proc_readlink,
3131         .read           = nfs4_proc_read,
3132         .write          = nfs4_proc_write,
3133         .commit         = nfs4_proc_commit,
3134         .create         = nfs4_proc_create,
3135         .remove         = nfs4_proc_remove,
3136         .unlink_setup   = nfs4_proc_unlink_setup,
3137         .unlink_done    = nfs4_proc_unlink_done,
3138         .rename         = nfs4_proc_rename,
3139         .link           = nfs4_proc_link,
3140         .symlink        = nfs4_proc_symlink,
3141         .mkdir          = nfs4_proc_mkdir,
3142         .rmdir          = nfs4_proc_remove,
3143         .readdir        = nfs4_proc_readdir,
3144         .mknod          = nfs4_proc_mknod,
3145         .statfs         = nfs4_proc_statfs,
3146         .fsinfo         = nfs4_proc_fsinfo,
3147         .pathconf       = nfs4_proc_pathconf,
3148         .decode_dirent  = nfs4_decode_dirent,
3149         .read_setup     = nfs4_proc_read_setup,
3150         .write_setup    = nfs4_proc_write_setup,
3151         .commit_setup   = nfs4_proc_commit_setup,
3152         .file_open      = nfs_open,
3153         .file_release   = nfs_release,
3154         .lock           = nfs4_proc_lock,
3155         .clear_acl_cache = nfs4_zap_acl_attr,
3156 };
3157
3158 /*
3159  * Local variables:
3160  *  c-basic-offset: 8
3161  * End:
3162  */