RPC: Clean up RPC task structure
[linux-2.6.git] / 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         spin_lock(&inode->i_lock);
191         nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
192         if (cinfo->before == nfsi->change_attr && cinfo->atomic)
193                 nfsi->change_attr = cinfo->after;
194         spin_unlock(&inode->i_lock);
195 }
196
197 /* Helper for asynchronous RPC calls */
198 static int nfs4_call_async(struct rpc_clnt *clnt, rpc_action tk_begin,
199                 const struct rpc_call_ops *tk_ops, void *calldata)
200 {
201         struct rpc_task *task;
202
203         if (!(task = rpc_new_task(clnt, RPC_TASK_ASYNC, tk_ops, calldata)))
204                 return -ENOMEM;
205         task->tk_action = tk_begin;
206         rpc_execute(task);
207         return 0;
208 }
209
210 static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
211 {
212         struct inode *inode = state->inode;
213
214         open_flags &= (FMODE_READ|FMODE_WRITE);
215         /* Protect against nfs4_find_state_byowner() */
216         spin_lock(&state->owner->so_lock);
217         spin_lock(&inode->i_lock);
218         memcpy(&state->stateid, stateid, sizeof(state->stateid));
219         if ((open_flags & FMODE_WRITE))
220                 state->nwriters++;
221         if (open_flags & FMODE_READ)
222                 state->nreaders++;
223         nfs4_state_set_mode_locked(state, state->state | open_flags);
224         spin_unlock(&inode->i_lock);
225         spin_unlock(&state->owner->so_lock);
226 }
227
228 /*
229  * OPEN_RECLAIM:
230  *      reclaim state on the server after a reboot.
231  */
232 static int _nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
233 {
234         struct inode *inode = state->inode;
235         struct nfs_server *server = NFS_SERVER(inode);
236         struct nfs_delegation *delegation = NFS_I(inode)->delegation;
237         struct nfs_openargs o_arg = {
238                 .fh = NFS_FH(inode),
239                 .id = sp->so_id,
240                 .open_flags = state->state,
241                 .clientid = server->nfs4_state->cl_clientid,
242                 .claim = NFS4_OPEN_CLAIM_PREVIOUS,
243                 .bitmask = server->attr_bitmask,
244         };
245         struct nfs_openres o_res = {
246                 .server = server,       /* Grrr */
247         };
248         struct rpc_message msg = {
249                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR],
250                 .rpc_argp       = &o_arg,
251                 .rpc_resp       = &o_res,
252                 .rpc_cred       = sp->so_cred,
253         };
254         int status;
255
256         if (delegation != NULL) {
257                 if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
258                         memcpy(&state->stateid, &delegation->stateid,
259                                         sizeof(state->stateid));
260                         set_bit(NFS_DELEGATED_STATE, &state->flags);
261                         return 0;
262                 }
263                 o_arg.u.delegation_type = delegation->type;
264         }
265         o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
266         if (o_arg.seqid == NULL)
267                 return -ENOMEM;
268         status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
269         /* Confirm the sequence as being established */
270         nfs_confirm_seqid(&sp->so_seqid, status);
271         nfs_increment_open_seqid(status, o_arg.seqid);
272         if (status == 0) {
273                 memcpy(&state->stateid, &o_res.stateid, sizeof(state->stateid));
274                 if (o_res.delegation_type != 0) {
275                         nfs_inode_reclaim_delegation(inode, sp->so_cred, &o_res);
276                         /* Did the server issue an immediate delegation recall? */
277                         if (o_res.do_recall)
278                                 nfs_async_inode_return_delegation(inode, &o_res.stateid);
279                 }
280         }
281         nfs_free_seqid(o_arg.seqid);
282         clear_bit(NFS_DELEGATED_STATE, &state->flags);
283         /* Ensure we update the inode attributes */
284         NFS_CACHEINV(inode);
285         return status;
286 }
287
288 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
289 {
290         struct nfs_server *server = NFS_SERVER(state->inode);
291         struct nfs4_exception exception = { };
292         int err;
293         do {
294                 err = _nfs4_open_reclaim(sp, state);
295                 if (err != -NFS4ERR_DELAY)
296                         break;
297                 nfs4_handle_exception(server, err, &exception);
298         } while (exception.retry);
299         return err;
300 }
301
302 static int _nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
303 {
304         struct nfs4_state_owner  *sp  = state->owner;
305         struct inode *inode = dentry->d_inode;
306         struct nfs_server *server = NFS_SERVER(inode);
307         struct dentry *parent = dget_parent(dentry);
308         struct nfs_openargs arg = {
309                 .fh = NFS_FH(parent->d_inode),
310                 .clientid = server->nfs4_state->cl_clientid,
311                 .name = &dentry->d_name,
312                 .id = sp->so_id,
313                 .server = server,
314                 .bitmask = server->attr_bitmask,
315                 .claim = NFS4_OPEN_CLAIM_DELEGATE_CUR,
316         };
317         struct nfs_openres res = {
318                 .server = server,
319         };
320         struct  rpc_message msg = {
321                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR],
322                 .rpc_argp       = &arg,
323                 .rpc_resp       = &res,
324                 .rpc_cred       = sp->so_cred,
325         };
326         int status = 0;
327
328         if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
329                 goto out;
330         if (state->state == 0)
331                 goto out;
332         arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
333         status = -ENOMEM;
334         if (arg.seqid == NULL)
335                 goto out;
336         arg.open_flags = state->state;
337         memcpy(arg.u.delegation.data, state->stateid.data, sizeof(arg.u.delegation.data));
338         status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
339         nfs_increment_open_seqid(status, arg.seqid);
340         if (status != 0)
341                 goto out_free;
342         if(res.rflags & NFS4_OPEN_RESULT_CONFIRM) {
343                 status = _nfs4_proc_open_confirm(server->client, NFS_FH(inode),
344                                 sp, &res.stateid, arg.seqid);
345                 if (status != 0)
346                         goto out_free;
347         }
348         nfs_confirm_seqid(&sp->so_seqid, 0);
349         if (status >= 0) {
350                 memcpy(state->stateid.data, res.stateid.data,
351                                 sizeof(state->stateid.data));
352                 clear_bit(NFS_DELEGATED_STATE, &state->flags);
353         }
354 out_free:
355         nfs_free_seqid(arg.seqid);
356 out:
357         dput(parent);
358         return status;
359 }
360
361 int nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
362 {
363         struct nfs4_exception exception = { };
364         struct nfs_server *server = NFS_SERVER(dentry->d_inode);
365         int err;
366         do {
367                 err = _nfs4_open_delegation_recall(dentry, state);
368                 switch (err) {
369                         case 0:
370                                 return err;
371                         case -NFS4ERR_STALE_CLIENTID:
372                         case -NFS4ERR_STALE_STATEID:
373                         case -NFS4ERR_EXPIRED:
374                                 /* Don't recall a delegation if it was lost */
375                                 nfs4_schedule_state_recovery(server->nfs4_state);
376                                 return err;
377                 }
378                 err = nfs4_handle_exception(server, err, &exception);
379         } while (exception.retry);
380         return err;
381 }
382
383 static int _nfs4_proc_open_confirm(struct rpc_clnt *clnt, const struct nfs_fh *fh, struct nfs4_state_owner *sp, nfs4_stateid *stateid, struct nfs_seqid *seqid)
384 {
385         struct nfs_open_confirmargs arg = {
386                 .fh             = fh,
387                 .seqid          = seqid,
388                 .stateid        = *stateid,
389         };
390         struct nfs_open_confirmres res;
391         struct  rpc_message msg = {
392                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
393                 .rpc_argp       = &arg,
394                 .rpc_resp       = &res,
395                 .rpc_cred       = sp->so_cred,
396         };
397         int status;
398
399         status = rpc_call_sync(clnt, &msg, RPC_TASK_NOINTR);
400         /* Confirm the sequence as being established */
401         nfs_confirm_seqid(&sp->so_seqid, status);
402         nfs_increment_open_seqid(status, seqid);
403         if (status >= 0)
404                 memcpy(stateid, &res.stateid, sizeof(*stateid));
405         return status;
406 }
407
408 static int _nfs4_proc_open(struct inode *dir, struct nfs4_state_owner  *sp, struct nfs_openargs *o_arg, struct nfs_openres *o_res)
409 {
410         struct nfs_server *server = NFS_SERVER(dir);
411         struct rpc_message msg = {
412                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
413                 .rpc_argp = o_arg,
414                 .rpc_resp = o_res,
415                 .rpc_cred = sp->so_cred,
416         };
417         int status;
418
419         /* Update sequence id. The caller must serialize! */
420         o_arg->id = sp->so_id;
421         o_arg->clientid = sp->so_client->cl_clientid;
422
423         status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
424         if (status == 0) {
425                 /* OPEN on anything except a regular file is disallowed in NFSv4 */
426                 switch (o_res->f_attr->mode & S_IFMT) {
427                         case S_IFREG:
428                                 break;
429                         case S_IFLNK:
430                                 status = -ELOOP;
431                                 break;
432                         case S_IFDIR:
433                                 status = -EISDIR;
434                                 break;
435                         default:
436                                 status = -ENOTDIR;
437                 }
438         }
439
440         nfs_increment_open_seqid(status, o_arg->seqid);
441         if (status != 0)
442                 goto out;
443         if (o_arg->open_flags & O_CREAT) {
444                 update_changeattr(dir, &o_res->cinfo);
445                 nfs_post_op_update_inode(dir, o_res->dir_attr);
446         } else
447                 nfs_refresh_inode(dir, o_res->dir_attr);
448         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
449                 status = _nfs4_proc_open_confirm(server->client, &o_res->fh,
450                                 sp, &o_res->stateid, o_arg->seqid);
451                 if (status != 0)
452                         goto out;
453         }
454         nfs_confirm_seqid(&sp->so_seqid, 0);
455         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
456                 status = server->rpc_ops->getattr(server, &o_res->fh, o_res->f_attr);
457 out:
458         return status;
459 }
460
461 static int _nfs4_do_access(struct inode *inode, struct rpc_cred *cred, int openflags)
462 {
463         struct nfs_access_entry cache;
464         int mask = 0;
465         int status;
466
467         if (openflags & FMODE_READ)
468                 mask |= MAY_READ;
469         if (openflags & FMODE_WRITE)
470                 mask |= MAY_WRITE;
471         status = nfs_access_get_cached(inode, cred, &cache);
472         if (status == 0)
473                 goto out;
474
475         /* Be clever: ask server to check for all possible rights */
476         cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ;
477         cache.cred = cred;
478         cache.jiffies = jiffies;
479         status = _nfs4_proc_access(inode, &cache);
480         if (status != 0)
481                 return status;
482         nfs_access_add_cache(inode, &cache);
483 out:
484         if ((cache.mask & mask) == mask)
485                 return 0;
486         return -EACCES;
487 }
488
489 /*
490  * OPEN_EXPIRED:
491  *      reclaim state on the server after a network partition.
492  *      Assumes caller holds the appropriate lock
493  */
494 static int _nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
495 {
496         struct dentry *parent = dget_parent(dentry);
497         struct inode *dir = parent->d_inode;
498         struct inode *inode = state->inode;
499         struct nfs_server *server = NFS_SERVER(dir);
500         struct nfs_delegation *delegation = NFS_I(inode)->delegation;
501         struct nfs_fattr f_attr, dir_attr;
502         struct nfs_openargs o_arg = {
503                 .fh = NFS_FH(dir),
504                 .open_flags = state->state,
505                 .name = &dentry->d_name,
506                 .bitmask = server->attr_bitmask,
507                 .claim = NFS4_OPEN_CLAIM_NULL,
508         };
509         struct nfs_openres o_res = {
510                 .f_attr = &f_attr,
511                 .dir_attr = &dir_attr,
512                 .server = server,
513         };
514         int status = 0;
515
516         if (delegation != NULL && !(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
517                 status = _nfs4_do_access(inode, sp->so_cred, state->state);
518                 if (status < 0)
519                         goto out;
520                 memcpy(&state->stateid, &delegation->stateid, sizeof(state->stateid));
521                 set_bit(NFS_DELEGATED_STATE, &state->flags);
522                 goto out;
523         }
524         o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
525         status = -ENOMEM;
526         if (o_arg.seqid == NULL)
527                 goto out;
528         nfs_fattr_init(&f_attr);
529         nfs_fattr_init(&dir_attr);
530         status = _nfs4_proc_open(dir, sp, &o_arg, &o_res);
531         if (status != 0)
532                 goto out_nodeleg;
533         /* Check if files differ */
534         if ((f_attr.mode & S_IFMT) != (inode->i_mode & S_IFMT))
535                 goto out_stale;
536         /* Has the file handle changed? */
537         if (nfs_compare_fh(&o_res.fh, NFS_FH(inode)) != 0) {
538                 /* Verify if the change attributes are the same */
539                 if (f_attr.change_attr != NFS_I(inode)->change_attr)
540                         goto out_stale;
541                 if (nfs_size_to_loff_t(f_attr.size) != inode->i_size)
542                         goto out_stale;
543                 /* Lets just pretend that this is the same file */
544                 nfs_copy_fh(NFS_FH(inode), &o_res.fh);
545                 NFS_I(inode)->fileid = f_attr.fileid;
546         }
547         memcpy(&state->stateid, &o_res.stateid, sizeof(state->stateid));
548         if (o_res.delegation_type != 0) {
549                 if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM))
550                         nfs_inode_set_delegation(inode, sp->so_cred, &o_res);
551                 else
552                         nfs_inode_reclaim_delegation(inode, sp->so_cred, &o_res);
553         }
554 out_nodeleg:
555         nfs_free_seqid(o_arg.seqid);
556         clear_bit(NFS_DELEGATED_STATE, &state->flags);
557 out:
558         dput(parent);
559         return status;
560 out_stale:
561         status = -ESTALE;
562         /* Invalidate the state owner so we don't ever use it again */
563         nfs4_drop_state_owner(sp);
564         d_drop(dentry);
565         /* Should we be trying to close that stateid? */
566         goto out_nodeleg;
567 }
568
569 static inline int nfs4_do_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
570 {
571         struct nfs_server *server = NFS_SERVER(dentry->d_inode);
572         struct nfs4_exception exception = { };
573         int err;
574
575         do {
576                 err = _nfs4_open_expired(sp, state, dentry);
577                 if (err == -NFS4ERR_DELAY)
578                         nfs4_handle_exception(server, err, &exception);
579         } while (exception.retry);
580         return err;
581 }
582
583 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
584 {
585         struct nfs_inode *nfsi = NFS_I(state->inode);
586         struct nfs_open_context *ctx;
587         int status;
588
589         spin_lock(&state->inode->i_lock);
590         list_for_each_entry(ctx, &nfsi->open_files, list) {
591                 if (ctx->state != state)
592                         continue;
593                 get_nfs_open_context(ctx);
594                 spin_unlock(&state->inode->i_lock);
595                 status = nfs4_do_open_expired(sp, state, ctx->dentry);
596                 put_nfs_open_context(ctx);
597                 return status;
598         }
599         spin_unlock(&state->inode->i_lock);
600         return -ENOENT;
601 }
602
603 /*
604  * Returns an nfs4_state + an extra reference to the inode
605  */
606 static int _nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred, struct nfs4_state **res)
607 {
608         struct nfs_delegation *delegation;
609         struct nfs_server *server = NFS_SERVER(inode);
610         struct nfs4_client *clp = server->nfs4_state;
611         struct nfs_inode *nfsi = NFS_I(inode);
612         struct nfs4_state_owner *sp = NULL;
613         struct nfs4_state *state = NULL;
614         int open_flags = flags & (FMODE_READ|FMODE_WRITE);
615         int err;
616
617         /* Protect against reboot recovery - NOTE ORDER! */
618         down_read(&clp->cl_sem);
619         /* Protect against delegation recall */
620         down_read(&nfsi->rwsem);
621         delegation = NFS_I(inode)->delegation;
622         err = -ENOENT;
623         if (delegation == NULL || (delegation->type & open_flags) != open_flags)
624                 goto out_err;
625         err = -ENOMEM;
626         if (!(sp = nfs4_get_state_owner(server, cred))) {
627                 dprintk("%s: nfs4_get_state_owner failed!\n", __FUNCTION__);
628                 goto out_err;
629         }
630         state = nfs4_get_open_state(inode, sp);
631         if (state == NULL)
632                 goto out_err;
633
634         err = -ENOENT;
635         if ((state->state & open_flags) == open_flags) {
636                 spin_lock(&inode->i_lock);
637                 if (open_flags & FMODE_READ)
638                         state->nreaders++;
639                 if (open_flags & FMODE_WRITE)
640                         state->nwriters++;
641                 spin_unlock(&inode->i_lock);
642                 goto out_ok;
643         } else if (state->state != 0)
644                 goto out_err;
645
646         lock_kernel();
647         err = _nfs4_do_access(inode, cred, open_flags);
648         unlock_kernel();
649         if (err != 0)
650                 goto out_err;
651         set_bit(NFS_DELEGATED_STATE, &state->flags);
652         update_open_stateid(state, &delegation->stateid, open_flags);
653 out_ok:
654         nfs4_put_state_owner(sp);
655         up_read(&nfsi->rwsem);
656         up_read(&clp->cl_sem);
657         igrab(inode);
658         *res = state;
659         return 0; 
660 out_err:
661         if (sp != NULL) {
662                 if (state != NULL)
663                         nfs4_put_open_state(state);
664                 nfs4_put_state_owner(sp);
665         }
666         up_read(&nfsi->rwsem);
667         up_read(&clp->cl_sem);
668         if (err != -EACCES)
669                 nfs_inode_return_delegation(inode);
670         return err;
671 }
672
673 static struct nfs4_state *nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred)
674 {
675         struct nfs4_exception exception = { };
676         struct nfs4_state *res;
677         int err;
678
679         do {
680                 err = _nfs4_open_delegated(inode, flags, cred, &res);
681                 if (err == 0)
682                         break;
683                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(inode),
684                                         err, &exception));
685         } while (exception.retry);
686         return res;
687 }
688
689 /*
690  * Returns an nfs4_state + an referenced inode
691  */
692 static int _nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
693 {
694         struct nfs4_state_owner  *sp;
695         struct nfs4_state     *state = NULL;
696         struct nfs_server       *server = NFS_SERVER(dir);
697         struct nfs4_client *clp = server->nfs4_state;
698         struct inode *inode = NULL;
699         int                     status;
700         struct nfs_fattr f_attr, dir_attr;
701         struct nfs_openargs o_arg = {
702                 .fh             = NFS_FH(dir),
703                 .open_flags     = flags,
704                 .name           = &dentry->d_name,
705                 .server         = server,
706                 .bitmask = server->attr_bitmask,
707                 .claim = NFS4_OPEN_CLAIM_NULL,
708         };
709         struct nfs_openres o_res = {
710                 .f_attr         = &f_attr,
711                 .dir_attr       = &dir_attr,
712                 .server         = server,
713         };
714
715         /* Protect against reboot recovery conflicts */
716         down_read(&clp->cl_sem);
717         status = -ENOMEM;
718         if (!(sp = nfs4_get_state_owner(server, cred))) {
719                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
720                 goto out_err;
721         }
722         if (flags & O_EXCL) {
723                 u32 *p = (u32 *) o_arg.u.verifier.data;
724                 p[0] = jiffies;
725                 p[1] = current->pid;
726         } else
727                 o_arg.u.attrs = sattr;
728         /* Serialization for the sequence id */
729
730         o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
731         if (o_arg.seqid == NULL)
732                 return -ENOMEM;
733         nfs_fattr_init(&f_attr);
734         nfs_fattr_init(&dir_attr);
735         status = _nfs4_proc_open(dir, sp, &o_arg, &o_res);
736         if (status != 0)
737                 goto out_err;
738
739         status = -ENOMEM;
740         inode = nfs_fhget(dir->i_sb, &o_res.fh, &f_attr);
741         if (!inode)
742                 goto out_err;
743         state = nfs4_get_open_state(inode, sp);
744         if (!state)
745                 goto out_err;
746         update_open_stateid(state, &o_res.stateid, flags);
747         if (o_res.delegation_type != 0)
748                 nfs_inode_set_delegation(inode, cred, &o_res);
749         nfs_free_seqid(o_arg.seqid);
750         nfs4_put_state_owner(sp);
751         up_read(&clp->cl_sem);
752         *res = state;
753         return 0;
754 out_err:
755         if (sp != NULL) {
756                 if (state != NULL)
757                         nfs4_put_open_state(state);
758                 nfs_free_seqid(o_arg.seqid);
759                 nfs4_put_state_owner(sp);
760         }
761         /* Note: clp->cl_sem must be released before nfs4_put_open_state()! */
762         up_read(&clp->cl_sem);
763         if (inode != NULL)
764                 iput(inode);
765         *res = NULL;
766         return status;
767 }
768
769
770 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred)
771 {
772         struct nfs4_exception exception = { };
773         struct nfs4_state *res;
774         int status;
775
776         do {
777                 status = _nfs4_do_open(dir, dentry, flags, sattr, cred, &res);
778                 if (status == 0)
779                         break;
780                 /* NOTE: BAD_SEQID means the server and client disagree about the
781                  * book-keeping w.r.t. state-changing operations
782                  * (OPEN/CLOSE/LOCK/LOCKU...)
783                  * It is actually a sign of a bug on the client or on the server.
784                  *
785                  * If we receive a BAD_SEQID error in the particular case of
786                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
787                  * have unhashed the old state_owner for us, and that we can
788                  * therefore safely retry using a new one. We should still warn
789                  * the user though...
790                  */
791                 if (status == -NFS4ERR_BAD_SEQID) {
792                         printk(KERN_WARNING "NFS: v4 server returned a bad sequence-id error!\n");
793                         exception.retry = 1;
794                         continue;
795                 }
796                 /*
797                  * BAD_STATEID on OPEN means that the server cancelled our
798                  * state before it received the OPEN_CONFIRM.
799                  * Recover by retrying the request as per the discussion
800                  * on Page 181 of RFC3530.
801                  */
802                 if (status == -NFS4ERR_BAD_STATEID) {
803                         exception.retry = 1;
804                         continue;
805                 }
806                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
807                                         status, &exception));
808         } while (exception.retry);
809         return res;
810 }
811
812 static int _nfs4_do_setattr(struct nfs_server *server, struct nfs_fattr *fattr,
813                 struct nfs_fh *fhandle, struct iattr *sattr,
814                 struct nfs4_state *state)
815 {
816         struct nfs_setattrargs  arg = {
817                 .fh             = fhandle,
818                 .iap            = sattr,
819                 .server         = server,
820                 .bitmask = server->attr_bitmask,
821         };
822         struct nfs_setattrres  res = {
823                 .fattr          = fattr,
824                 .server         = server,
825         };
826         struct rpc_message msg = {
827                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
828                 .rpc_argp       = &arg,
829                 .rpc_resp       = &res,
830         };
831         int status;
832
833         nfs_fattr_init(fattr);
834
835         if (state != NULL) {
836                 msg.rpc_cred = state->owner->so_cred;
837                 nfs4_copy_stateid(&arg.stateid, state, current->files);
838         } else
839                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
840
841         status = rpc_call_sync(server->client, &msg, 0);
842         return status;
843 }
844
845 static int nfs4_do_setattr(struct nfs_server *server, struct nfs_fattr *fattr,
846                 struct nfs_fh *fhandle, struct iattr *sattr,
847                 struct nfs4_state *state)
848 {
849         struct nfs4_exception exception = { };
850         int err;
851         do {
852                 err = nfs4_handle_exception(server,
853                                 _nfs4_do_setattr(server, fattr, fhandle, sattr,
854                                         state),
855                                 &exception);
856         } while (exception.retry);
857         return err;
858 }
859
860 struct nfs4_closedata {
861         struct inode *inode;
862         struct nfs4_state *state;
863         struct nfs_closeargs arg;
864         struct nfs_closeres res;
865         struct nfs_fattr fattr;
866 };
867
868 static void nfs4_free_closedata(void *data)
869 {
870         struct nfs4_closedata *calldata = data;
871         struct nfs4_state_owner *sp = calldata->state->owner;
872
873         nfs4_put_open_state(calldata->state);
874         nfs_free_seqid(calldata->arg.seqid);
875         nfs4_put_state_owner(sp);
876         kfree(calldata);
877 }
878
879 static void nfs4_close_done(struct rpc_task *task, void *data)
880 {
881         struct nfs4_closedata *calldata = data;
882         struct nfs4_state *state = calldata->state;
883         struct nfs_server *server = NFS_SERVER(calldata->inode);
884
885         /* hmm. we are done with the inode, and in the process of freeing
886          * the state_owner. we keep this around to process errors
887          */
888         nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid);
889         switch (task->tk_status) {
890                 case 0:
891                         memcpy(&state->stateid, &calldata->res.stateid,
892                                         sizeof(state->stateid));
893                         break;
894                 case -NFS4ERR_STALE_STATEID:
895                 case -NFS4ERR_EXPIRED:
896                         nfs4_schedule_state_recovery(server->nfs4_state);
897                         break;
898                 default:
899                         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
900                                 rpc_restart_call(task);
901                                 return;
902                         }
903         }
904         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
905 }
906
907 static void nfs4_close_begin(struct rpc_task *task)
908 {
909         struct nfs4_closedata *calldata = (struct nfs4_closedata *)task->tk_calldata;
910         struct nfs4_state *state = calldata->state;
911         struct rpc_message msg = {
912                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
913                 .rpc_argp = &calldata->arg,
914                 .rpc_resp = &calldata->res,
915                 .rpc_cred = state->owner->so_cred,
916         };
917         int mode = 0, old_mode;
918
919         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
920                 return;
921         /* Recalculate the new open mode in case someone reopened the file
922          * while we were waiting in line to be scheduled.
923          */
924         spin_lock(&state->owner->so_lock);
925         spin_lock(&calldata->inode->i_lock);
926         mode = old_mode = state->state;
927         if (state->nreaders == 0)
928                 mode &= ~FMODE_READ;
929         if (state->nwriters == 0)
930                 mode &= ~FMODE_WRITE;
931         nfs4_state_set_mode_locked(state, mode);
932         spin_unlock(&calldata->inode->i_lock);
933         spin_unlock(&state->owner->so_lock);
934         if (mode == old_mode || test_bit(NFS_DELEGATED_STATE, &state->flags)) {
935                 /* Note: exit _without_ calling nfs4_close_done */
936                 task->tk_action = NULL;
937                 return;
938         }
939         nfs_fattr_init(calldata->res.fattr);
940         if (mode != 0)
941                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
942         calldata->arg.open_flags = mode;
943         rpc_call_setup(task, &msg, 0);
944 }
945
946 static const struct rpc_call_ops nfs4_close_ops = {
947         .rpc_call_done = nfs4_close_done,
948         .rpc_release = nfs4_free_closedata,
949 };
950
951 /* 
952  * It is possible for data to be read/written from a mem-mapped file 
953  * after the sys_close call (which hits the vfs layer as a flush).
954  * This means that we can't safely call nfsv4 close on a file until 
955  * the inode is cleared. This in turn means that we are not good
956  * NFSv4 citizens - we do not indicate to the server to update the file's 
957  * share state even when we are done with one of the three share 
958  * stateid's in the inode.
959  *
960  * NOTE: Caller must be holding the sp->so_owner semaphore!
961  */
962 int nfs4_do_close(struct inode *inode, struct nfs4_state *state) 
963 {
964         struct nfs_server *server = NFS_SERVER(inode);
965         struct nfs4_closedata *calldata;
966         int status = -ENOMEM;
967
968         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
969         if (calldata == NULL)
970                 goto out;
971         calldata->inode = inode;
972         calldata->state = state;
973         calldata->arg.fh = NFS_FH(inode);
974         calldata->arg.stateid = &state->stateid;
975         /* Serialization for the sequence id */
976         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
977         if (calldata->arg.seqid == NULL)
978                 goto out_free_calldata;
979         calldata->arg.bitmask = server->attr_bitmask;
980         calldata->res.fattr = &calldata->fattr;
981         calldata->res.server = server;
982
983         status = nfs4_call_async(server->client, nfs4_close_begin,
984                         &nfs4_close_ops, calldata);
985         if (status == 0)
986                 goto out;
987
988         nfs_free_seqid(calldata->arg.seqid);
989 out_free_calldata:
990         kfree(calldata);
991 out:
992         return status;
993 }
994
995 static void nfs4_intent_set_file(struct nameidata *nd, struct dentry *dentry, struct nfs4_state *state)
996 {
997         struct file *filp;
998
999         filp = lookup_instantiate_filp(nd, dentry, NULL);
1000         if (!IS_ERR(filp)) {
1001                 struct nfs_open_context *ctx;
1002                 ctx = (struct nfs_open_context *)filp->private_data;
1003                 ctx->state = state;
1004         } else
1005                 nfs4_close_state(state, nd->intent.open.flags);
1006 }
1007
1008 struct dentry *
1009 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1010 {
1011         struct iattr attr;
1012         struct rpc_cred *cred;
1013         struct nfs4_state *state;
1014         struct dentry *res;
1015
1016         if (nd->flags & LOOKUP_CREATE) {
1017                 attr.ia_mode = nd->intent.open.create_mode;
1018                 attr.ia_valid = ATTR_MODE;
1019                 if (!IS_POSIXACL(dir))
1020                         attr.ia_mode &= ~current->fs->umask;
1021         } else {
1022                 attr.ia_valid = 0;
1023                 BUG_ON(nd->intent.open.flags & O_CREAT);
1024         }
1025
1026         cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1027         if (IS_ERR(cred))
1028                 return (struct dentry *)cred;
1029         state = nfs4_do_open(dir, dentry, nd->intent.open.flags, &attr, cred);
1030         put_rpccred(cred);
1031         if (IS_ERR(state)) {
1032                 if (PTR_ERR(state) == -ENOENT)
1033                         d_add(dentry, NULL);
1034                 return (struct dentry *)state;
1035         }
1036         res = d_add_unique(dentry, state->inode);
1037         if (res != NULL)
1038                 dentry = res;
1039         nfs4_intent_set_file(nd, dentry, state);
1040         return res;
1041 }
1042
1043 int
1044 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1045 {
1046         struct rpc_cred *cred;
1047         struct nfs4_state *state;
1048         struct inode *inode;
1049
1050         cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1051         if (IS_ERR(cred))
1052                 return PTR_ERR(cred);
1053         state = nfs4_open_delegated(dentry->d_inode, openflags, cred);
1054         if (IS_ERR(state))
1055                 state = nfs4_do_open(dir, dentry, openflags, NULL, cred);
1056         put_rpccred(cred);
1057         if (IS_ERR(state)) {
1058                 switch (PTR_ERR(state)) {
1059                         case -EPERM:
1060                         case -EACCES:
1061                         case -EDQUOT:
1062                         case -ENOSPC:
1063                         case -EROFS:
1064                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1065                                 return 1;
1066                         case -ENOENT:
1067                                 if (dentry->d_inode == NULL)
1068                                         return 1;
1069                 }
1070                 goto out_drop;
1071         }
1072         inode = state->inode;
1073         iput(inode);
1074         if (inode == dentry->d_inode) {
1075                 nfs4_intent_set_file(nd, dentry, state);
1076                 return 1;
1077         }
1078         nfs4_close_state(state, openflags);
1079 out_drop:
1080         d_drop(dentry);
1081         return 0;
1082 }
1083
1084
1085 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1086 {
1087         struct nfs4_server_caps_res res = {};
1088         struct rpc_message msg = {
1089                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1090                 .rpc_argp = fhandle,
1091                 .rpc_resp = &res,
1092         };
1093         int status;
1094
1095         status = rpc_call_sync(server->client, &msg, 0);
1096         if (status == 0) {
1097                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1098                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1099                         server->caps |= NFS_CAP_ACLS;
1100                 if (res.has_links != 0)
1101                         server->caps |= NFS_CAP_HARDLINKS;
1102                 if (res.has_symlinks != 0)
1103                         server->caps |= NFS_CAP_SYMLINKS;
1104                 server->acl_bitmask = res.acl_bitmask;
1105         }
1106         return status;
1107 }
1108
1109 static int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1110 {
1111         struct nfs4_exception exception = { };
1112         int err;
1113         do {
1114                 err = nfs4_handle_exception(server,
1115                                 _nfs4_server_capabilities(server, fhandle),
1116                                 &exception);
1117         } while (exception.retry);
1118         return err;
1119 }
1120
1121 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1122                 struct nfs_fsinfo *info)
1123 {
1124         struct nfs4_lookup_root_arg args = {
1125                 .bitmask = nfs4_fattr_bitmap,
1126         };
1127         struct nfs4_lookup_res res = {
1128                 .server = server,
1129                 .fattr = info->fattr,
1130                 .fh = fhandle,
1131         };
1132         struct rpc_message msg = {
1133                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1134                 .rpc_argp = &args,
1135                 .rpc_resp = &res,
1136         };
1137         nfs_fattr_init(info->fattr);
1138         return rpc_call_sync(server->client, &msg, 0);
1139 }
1140
1141 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1142                 struct nfs_fsinfo *info)
1143 {
1144         struct nfs4_exception exception = { };
1145         int err;
1146         do {
1147                 err = nfs4_handle_exception(server,
1148                                 _nfs4_lookup_root(server, fhandle, info),
1149                                 &exception);
1150         } while (exception.retry);
1151         return err;
1152 }
1153
1154 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1155                 struct nfs_fsinfo *info)
1156 {
1157         struct nfs_fattr *      fattr = info->fattr;
1158         unsigned char *         p;
1159         struct qstr             q;
1160         struct nfs4_lookup_arg args = {
1161                 .dir_fh = fhandle,
1162                 .name = &q,
1163                 .bitmask = nfs4_fattr_bitmap,
1164         };
1165         struct nfs4_lookup_res res = {
1166                 .server = server,
1167                 .fattr = fattr,
1168                 .fh = fhandle,
1169         };
1170         struct rpc_message msg = {
1171                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1172                 .rpc_argp = &args,
1173                 .rpc_resp = &res,
1174         };
1175         int status;
1176
1177         /*
1178          * Now we do a separate LOOKUP for each component of the mount path.
1179          * The LOOKUPs are done separately so that we can conveniently
1180          * catch an ERR_WRONGSEC if it occurs along the way...
1181          */
1182         status = nfs4_lookup_root(server, fhandle, info);
1183         if (status)
1184                 goto out;
1185
1186         p = server->mnt_path;
1187         for (;;) {
1188                 struct nfs4_exception exception = { };
1189
1190                 while (*p == '/')
1191                         p++;
1192                 if (!*p)
1193                         break;
1194                 q.name = p;
1195                 while (*p && (*p != '/'))
1196                         p++;
1197                 q.len = p - q.name;
1198
1199                 do {
1200                         nfs_fattr_init(fattr);
1201                         status = nfs4_handle_exception(server,
1202                                         rpc_call_sync(server->client, &msg, 0),
1203                                         &exception);
1204                 } while (exception.retry);
1205                 if (status == 0)
1206                         continue;
1207                 if (status == -ENOENT) {
1208                         printk(KERN_NOTICE "NFS: mount path %s does not exist!\n", server->mnt_path);
1209                         printk(KERN_NOTICE "NFS: suggestion: try mounting '/' instead.\n");
1210                 }
1211                 break;
1212         }
1213         if (status == 0)
1214                 status = nfs4_server_capabilities(server, fhandle);
1215         if (status == 0)
1216                 status = nfs4_do_fsinfo(server, fhandle, info);
1217 out:
1218         return status;
1219 }
1220
1221 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1222 {
1223         struct nfs4_getattr_arg args = {
1224                 .fh = fhandle,
1225                 .bitmask = server->attr_bitmask,
1226         };
1227         struct nfs4_getattr_res res = {
1228                 .fattr = fattr,
1229                 .server = server,
1230         };
1231         struct rpc_message msg = {
1232                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1233                 .rpc_argp = &args,
1234                 .rpc_resp = &res,
1235         };
1236         
1237         nfs_fattr_init(fattr);
1238         return rpc_call_sync(server->client, &msg, 0);
1239 }
1240
1241 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1242 {
1243         struct nfs4_exception exception = { };
1244         int err;
1245         do {
1246                 err = nfs4_handle_exception(server,
1247                                 _nfs4_proc_getattr(server, fhandle, fattr),
1248                                 &exception);
1249         } while (exception.retry);
1250         return err;
1251 }
1252
1253 /* 
1254  * The file is not closed if it is opened due to the a request to change
1255  * the size of the file. The open call will not be needed once the
1256  * VFS layer lookup-intents are implemented.
1257  *
1258  * Close is called when the inode is destroyed.
1259  * If we haven't opened the file for O_WRONLY, we
1260  * need to in the size_change case to obtain a stateid.
1261  *
1262  * Got race?
1263  * Because OPEN is always done by name in nfsv4, it is
1264  * possible that we opened a different file by the same
1265  * name.  We can recognize this race condition, but we
1266  * can't do anything about it besides returning an error.
1267  *
1268  * This will be fixed with VFS changes (lookup-intent).
1269  */
1270 static int
1271 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1272                   struct iattr *sattr)
1273 {
1274         struct rpc_cred *cred;
1275         struct inode *inode = dentry->d_inode;
1276         struct nfs_open_context *ctx;
1277         struct nfs4_state *state = NULL;
1278         int status;
1279
1280         nfs_fattr_init(fattr);
1281         
1282         cred = rpcauth_lookupcred(NFS_SERVER(inode)->client->cl_auth, 0);
1283         if (IS_ERR(cred))
1284                 return PTR_ERR(cred);
1285
1286         /* Search for an existing open(O_WRITE) file */
1287         ctx = nfs_find_open_context(inode, cred, FMODE_WRITE);
1288         if (ctx != NULL)
1289                 state = ctx->state;
1290
1291         status = nfs4_do_setattr(NFS_SERVER(inode), fattr,
1292                         NFS_FH(inode), sattr, state);
1293         if (status == 0)
1294                 nfs_setattr_update_inode(inode, sattr);
1295         if (ctx != NULL)
1296                 put_nfs_open_context(ctx);
1297         put_rpccred(cred);
1298         return status;
1299 }
1300
1301 static int _nfs4_proc_lookup(struct inode *dir, struct qstr *name,
1302                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1303 {
1304         int                    status;
1305         struct nfs_server *server = NFS_SERVER(dir);
1306         struct nfs4_lookup_arg args = {
1307                 .bitmask = server->attr_bitmask,
1308                 .dir_fh = NFS_FH(dir),
1309                 .name = name,
1310         };
1311         struct nfs4_lookup_res res = {
1312                 .server = server,
1313                 .fattr = fattr,
1314                 .fh = fhandle,
1315         };
1316         struct rpc_message msg = {
1317                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1318                 .rpc_argp = &args,
1319                 .rpc_resp = &res,
1320         };
1321         
1322         nfs_fattr_init(fattr);
1323         
1324         dprintk("NFS call  lookup %s\n", name->name);
1325         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1326         dprintk("NFS reply lookup: %d\n", status);
1327         return status;
1328 }
1329
1330 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1331 {
1332         struct nfs4_exception exception = { };
1333         int err;
1334         do {
1335                 err = nfs4_handle_exception(NFS_SERVER(dir),
1336                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1337                                 &exception);
1338         } while (exception.retry);
1339         return err;
1340 }
1341
1342 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1343 {
1344         struct nfs4_accessargs args = {
1345                 .fh = NFS_FH(inode),
1346         };
1347         struct nfs4_accessres res = { 0 };
1348         struct rpc_message msg = {
1349                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1350                 .rpc_argp = &args,
1351                 .rpc_resp = &res,
1352                 .rpc_cred = entry->cred,
1353         };
1354         int mode = entry->mask;
1355         int status;
1356
1357         /*
1358          * Determine which access bits we want to ask for...
1359          */
1360         if (mode & MAY_READ)
1361                 args.access |= NFS4_ACCESS_READ;
1362         if (S_ISDIR(inode->i_mode)) {
1363                 if (mode & MAY_WRITE)
1364                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1365                 if (mode & MAY_EXEC)
1366                         args.access |= NFS4_ACCESS_LOOKUP;
1367         } else {
1368                 if (mode & MAY_WRITE)
1369                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1370                 if (mode & MAY_EXEC)
1371                         args.access |= NFS4_ACCESS_EXECUTE;
1372         }
1373         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1374         if (!status) {
1375                 entry->mask = 0;
1376                 if (res.access & NFS4_ACCESS_READ)
1377                         entry->mask |= MAY_READ;
1378                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1379                         entry->mask |= MAY_WRITE;
1380                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1381                         entry->mask |= MAY_EXEC;
1382         }
1383         return status;
1384 }
1385
1386 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1387 {
1388         struct nfs4_exception exception = { };
1389         int err;
1390         do {
1391                 err = nfs4_handle_exception(NFS_SERVER(inode),
1392                                 _nfs4_proc_access(inode, entry),
1393                                 &exception);
1394         } while (exception.retry);
1395         return err;
1396 }
1397
1398 /*
1399  * TODO: For the time being, we don't try to get any attributes
1400  * along with any of the zero-copy operations READ, READDIR,
1401  * READLINK, WRITE.
1402  *
1403  * In the case of the first three, we want to put the GETATTR
1404  * after the read-type operation -- this is because it is hard
1405  * to predict the length of a GETATTR response in v4, and thus
1406  * align the READ data correctly.  This means that the GETATTR
1407  * may end up partially falling into the page cache, and we should
1408  * shift it into the 'tail' of the xdr_buf before processing.
1409  * To do this efficiently, we need to know the total length
1410  * of data received, which doesn't seem to be available outside
1411  * of the RPC layer.
1412  *
1413  * In the case of WRITE, we also want to put the GETATTR after
1414  * the operation -- in this case because we want to make sure
1415  * we get the post-operation mtime and size.  This means that
1416  * we can't use xdr_encode_pages() as written: we need a variant
1417  * of it which would leave room in the 'tail' iovec.
1418  *
1419  * Both of these changes to the XDR layer would in fact be quite
1420  * minor, but I decided to leave them for a subsequent patch.
1421  */
1422 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1423                 unsigned int pgbase, unsigned int pglen)
1424 {
1425         struct nfs4_readlink args = {
1426                 .fh       = NFS_FH(inode),
1427                 .pgbase   = pgbase,
1428                 .pglen    = pglen,
1429                 .pages    = &page,
1430         };
1431         struct rpc_message msg = {
1432                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1433                 .rpc_argp = &args,
1434                 .rpc_resp = NULL,
1435         };
1436
1437         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1438 }
1439
1440 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1441                 unsigned int pgbase, unsigned int pglen)
1442 {
1443         struct nfs4_exception exception = { };
1444         int err;
1445         do {
1446                 err = nfs4_handle_exception(NFS_SERVER(inode),
1447                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1448                                 &exception);
1449         } while (exception.retry);
1450         return err;
1451 }
1452
1453 static int _nfs4_proc_read(struct nfs_read_data *rdata)
1454 {
1455         int flags = rdata->flags;
1456         struct inode *inode = rdata->inode;
1457         struct nfs_fattr *fattr = rdata->res.fattr;
1458         struct nfs_server *server = NFS_SERVER(inode);
1459         struct rpc_message msg = {
1460                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_READ],
1461                 .rpc_argp       = &rdata->args,
1462                 .rpc_resp       = &rdata->res,
1463                 .rpc_cred       = rdata->cred,
1464         };
1465         unsigned long timestamp = jiffies;
1466         int status;
1467
1468         dprintk("NFS call  read %d @ %Ld\n", rdata->args.count,
1469                         (long long) rdata->args.offset);
1470
1471         nfs_fattr_init(fattr);
1472         status = rpc_call_sync(server->client, &msg, flags);
1473         if (!status)
1474                 renew_lease(server, timestamp);
1475         dprintk("NFS reply read: %d\n", status);
1476         return status;
1477 }
1478
1479 static int nfs4_proc_read(struct nfs_read_data *rdata)
1480 {
1481         struct nfs4_exception exception = { };
1482         int err;
1483         do {
1484                 err = nfs4_handle_exception(NFS_SERVER(rdata->inode),
1485                                 _nfs4_proc_read(rdata),
1486                                 &exception);
1487         } while (exception.retry);
1488         return err;
1489 }
1490
1491 static int _nfs4_proc_write(struct nfs_write_data *wdata)
1492 {
1493         int rpcflags = wdata->flags;
1494         struct inode *inode = wdata->inode;
1495         struct nfs_fattr *fattr = wdata->res.fattr;
1496         struct nfs_server *server = NFS_SERVER(inode);
1497         struct rpc_message msg = {
1498                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
1499                 .rpc_argp       = &wdata->args,
1500                 .rpc_resp       = &wdata->res,
1501                 .rpc_cred       = wdata->cred,
1502         };
1503         int status;
1504
1505         dprintk("NFS call  write %d @ %Ld\n", wdata->args.count,
1506                         (long long) wdata->args.offset);
1507
1508         wdata->args.bitmask = server->attr_bitmask;
1509         wdata->res.server = server;
1510         nfs_fattr_init(fattr);
1511         status = rpc_call_sync(server->client, &msg, rpcflags);
1512         dprintk("NFS reply write: %d\n", status);
1513         if (status < 0)
1514                 return status;
1515         nfs_post_op_update_inode(inode, fattr);
1516         return wdata->res.count;
1517 }
1518
1519 static int nfs4_proc_write(struct nfs_write_data *wdata)
1520 {
1521         struct nfs4_exception exception = { };
1522         int err;
1523         do {
1524                 err = nfs4_handle_exception(NFS_SERVER(wdata->inode),
1525                                 _nfs4_proc_write(wdata),
1526                                 &exception);
1527         } while (exception.retry);
1528         return err;
1529 }
1530
1531 static int _nfs4_proc_commit(struct nfs_write_data *cdata)
1532 {
1533         struct inode *inode = cdata->inode;
1534         struct nfs_fattr *fattr = cdata->res.fattr;
1535         struct nfs_server *server = NFS_SERVER(inode);
1536         struct rpc_message msg = {
1537                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
1538                 .rpc_argp       = &cdata->args,
1539                 .rpc_resp       = &cdata->res,
1540                 .rpc_cred       = cdata->cred,
1541         };
1542         int status;
1543
1544         dprintk("NFS call  commit %d @ %Ld\n", cdata->args.count,
1545                         (long long) cdata->args.offset);
1546
1547         cdata->args.bitmask = server->attr_bitmask;
1548         cdata->res.server = server;
1549         nfs_fattr_init(fattr);
1550         status = rpc_call_sync(server->client, &msg, 0);
1551         dprintk("NFS reply commit: %d\n", status);
1552         if (status >= 0)
1553                 nfs_post_op_update_inode(inode, fattr);
1554         return status;
1555 }
1556
1557 static int nfs4_proc_commit(struct nfs_write_data *cdata)
1558 {
1559         struct nfs4_exception exception = { };
1560         int err;
1561         do {
1562                 err = nfs4_handle_exception(NFS_SERVER(cdata->inode),
1563                                 _nfs4_proc_commit(cdata),
1564                                 &exception);
1565         } while (exception.retry);
1566         return err;
1567 }
1568
1569 /*
1570  * Got race?
1571  * We will need to arrange for the VFS layer to provide an atomic open.
1572  * Until then, this create/open method is prone to inefficiency and race
1573  * conditions due to the lookup, create, and open VFS calls from sys_open()
1574  * placed on the wire.
1575  *
1576  * Given the above sorry state of affairs, I'm simply sending an OPEN.
1577  * The file will be opened again in the subsequent VFS open call
1578  * (nfs4_proc_file_open).
1579  *
1580  * The open for read will just hang around to be used by any process that
1581  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1582  */
1583
1584 static int
1585 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
1586                  int flags, struct nameidata *nd)
1587 {
1588         struct nfs4_state *state;
1589         struct rpc_cred *cred;
1590         int status = 0;
1591
1592         cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1593         if (IS_ERR(cred)) {
1594                 status = PTR_ERR(cred);
1595                 goto out;
1596         }
1597         state = nfs4_do_open(dir, dentry, flags, sattr, cred);
1598         put_rpccred(cred);
1599         if (IS_ERR(state)) {
1600                 status = PTR_ERR(state);
1601                 goto out;
1602         }
1603         d_instantiate(dentry, state->inode);
1604         if (flags & O_EXCL) {
1605                 struct nfs_fattr fattr;
1606                 status = nfs4_do_setattr(NFS_SERVER(dir), &fattr,
1607                                      NFS_FH(state->inode), sattr, state);
1608                 if (status == 0)
1609                         nfs_setattr_update_inode(state->inode, sattr);
1610         }
1611         if (status == 0 && nd != NULL && (nd->flags & LOOKUP_OPEN))
1612                 nfs4_intent_set_file(nd, dentry, state);
1613         else
1614                 nfs4_close_state(state, flags);
1615 out:
1616         return status;
1617 }
1618
1619 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1620 {
1621         struct nfs_server *server = NFS_SERVER(dir);
1622         struct nfs4_remove_arg args = {
1623                 .fh = NFS_FH(dir),
1624                 .name = name,
1625                 .bitmask = server->attr_bitmask,
1626         };
1627         struct nfs_fattr dir_attr;
1628         struct nfs4_remove_res  res = {
1629                 .server = server,
1630                 .dir_attr = &dir_attr,
1631         };
1632         struct rpc_message msg = {
1633                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1634                 .rpc_argp       = &args,
1635                 .rpc_resp       = &res,
1636         };
1637         int                     status;
1638
1639         nfs_fattr_init(res.dir_attr);
1640         status = rpc_call_sync(server->client, &msg, 0);
1641         if (status == 0) {
1642                 update_changeattr(dir, &res.cinfo);
1643                 nfs_post_op_update_inode(dir, res.dir_attr);
1644         }
1645         return status;
1646 }
1647
1648 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1649 {
1650         struct nfs4_exception exception = { };
1651         int err;
1652         do {
1653                 err = nfs4_handle_exception(NFS_SERVER(dir),
1654                                 _nfs4_proc_remove(dir, name),
1655                                 &exception);
1656         } while (exception.retry);
1657         return err;
1658 }
1659
1660 struct unlink_desc {
1661         struct nfs4_remove_arg  args;
1662         struct nfs4_remove_res  res;
1663         struct nfs_fattr dir_attr;
1664 };
1665
1666 static int nfs4_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir,
1667                 struct qstr *name)
1668 {
1669         struct nfs_server *server = NFS_SERVER(dir->d_inode);
1670         struct unlink_desc *up;
1671
1672         up = (struct unlink_desc *) kmalloc(sizeof(*up), GFP_KERNEL);
1673         if (!up)
1674                 return -ENOMEM;
1675         
1676         up->args.fh = NFS_FH(dir->d_inode);
1677         up->args.name = name;
1678         up->args.bitmask = server->attr_bitmask;
1679         up->res.server = server;
1680         up->res.dir_attr = &up->dir_attr;
1681         
1682         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1683         msg->rpc_argp = &up->args;
1684         msg->rpc_resp = &up->res;
1685         return 0;
1686 }
1687
1688 static int nfs4_proc_unlink_done(struct dentry *dir, struct rpc_task *task)
1689 {
1690         struct rpc_message *msg = &task->tk_msg;
1691         struct unlink_desc *up;
1692         
1693         if (msg->rpc_resp != NULL) {
1694                 up = container_of(msg->rpc_resp, struct unlink_desc, res);
1695                 update_changeattr(dir->d_inode, &up->res.cinfo);
1696                 nfs_post_op_update_inode(dir->d_inode, up->res.dir_attr);
1697                 kfree(up);
1698                 msg->rpc_resp = NULL;
1699                 msg->rpc_argp = NULL;
1700         }
1701         return 0;
1702 }
1703
1704 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1705                 struct inode *new_dir, struct qstr *new_name)
1706 {
1707         struct nfs_server *server = NFS_SERVER(old_dir);
1708         struct nfs4_rename_arg arg = {
1709                 .old_dir = NFS_FH(old_dir),
1710                 .new_dir = NFS_FH(new_dir),
1711                 .old_name = old_name,
1712                 .new_name = new_name,
1713                 .bitmask = server->attr_bitmask,
1714         };
1715         struct nfs_fattr old_fattr, new_fattr;
1716         struct nfs4_rename_res res = {
1717                 .server = server,
1718                 .old_fattr = &old_fattr,
1719                 .new_fattr = &new_fattr,
1720         };
1721         struct rpc_message msg = {
1722                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
1723                 .rpc_argp = &arg,
1724                 .rpc_resp = &res,
1725         };
1726         int                     status;
1727         
1728         nfs_fattr_init(res.old_fattr);
1729         nfs_fattr_init(res.new_fattr);
1730         status = rpc_call_sync(server->client, &msg, 0);
1731
1732         if (!status) {
1733                 update_changeattr(old_dir, &res.old_cinfo);
1734                 nfs_post_op_update_inode(old_dir, res.old_fattr);
1735                 update_changeattr(new_dir, &res.new_cinfo);
1736                 nfs_post_op_update_inode(new_dir, res.new_fattr);
1737         }
1738         return status;
1739 }
1740
1741 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1742                 struct inode *new_dir, struct qstr *new_name)
1743 {
1744         struct nfs4_exception exception = { };
1745         int err;
1746         do {
1747                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
1748                                 _nfs4_proc_rename(old_dir, old_name,
1749                                         new_dir, new_name),
1750                                 &exception);
1751         } while (exception.retry);
1752         return err;
1753 }
1754
1755 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
1756 {
1757         struct nfs_server *server = NFS_SERVER(inode);
1758         struct nfs4_link_arg arg = {
1759                 .fh     = NFS_FH(inode),
1760                 .dir_fh = NFS_FH(dir),
1761                 .name   = name,
1762                 .bitmask = server->attr_bitmask,
1763         };
1764         struct nfs_fattr fattr, dir_attr;
1765         struct nfs4_link_res res = {
1766                 .server = server,
1767                 .fattr = &fattr,
1768                 .dir_attr = &dir_attr,
1769         };
1770         struct rpc_message msg = {
1771                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
1772                 .rpc_argp = &arg,
1773                 .rpc_resp = &res,
1774         };
1775         int                     status;
1776
1777         nfs_fattr_init(res.fattr);
1778         nfs_fattr_init(res.dir_attr);
1779         status = rpc_call_sync(server->client, &msg, 0);
1780         if (!status) {
1781                 update_changeattr(dir, &res.cinfo);
1782                 nfs_post_op_update_inode(dir, res.dir_attr);
1783                 nfs_refresh_inode(inode, res.fattr);
1784         }
1785
1786         return status;
1787 }
1788
1789 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
1790 {
1791         struct nfs4_exception exception = { };
1792         int err;
1793         do {
1794                 err = nfs4_handle_exception(NFS_SERVER(inode),
1795                                 _nfs4_proc_link(inode, dir, name),
1796                                 &exception);
1797         } while (exception.retry);
1798         return err;
1799 }
1800
1801 static int _nfs4_proc_symlink(struct inode *dir, struct qstr *name,
1802                 struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle,
1803                 struct nfs_fattr *fattr)
1804 {
1805         struct nfs_server *server = NFS_SERVER(dir);
1806         struct nfs_fattr dir_fattr;
1807         struct nfs4_create_arg arg = {
1808                 .dir_fh = NFS_FH(dir),
1809                 .server = server,
1810                 .name = name,
1811                 .attrs = sattr,
1812                 .ftype = NF4LNK,
1813                 .bitmask = server->attr_bitmask,
1814         };
1815         struct nfs4_create_res res = {
1816                 .server = server,
1817                 .fh = fhandle,
1818                 .fattr = fattr,
1819                 .dir_fattr = &dir_fattr,
1820         };
1821         struct rpc_message msg = {
1822                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
1823                 .rpc_argp = &arg,
1824                 .rpc_resp = &res,
1825         };
1826         int                     status;
1827
1828         if (path->len > NFS4_MAXPATHLEN)
1829                 return -ENAMETOOLONG;
1830         arg.u.symlink = path;
1831         nfs_fattr_init(fattr);
1832         nfs_fattr_init(&dir_fattr);
1833         
1834         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1835         if (!status)
1836                 update_changeattr(dir, &res.dir_cinfo);
1837         nfs_post_op_update_inode(dir, res.dir_fattr);
1838         return status;
1839 }
1840
1841 static int nfs4_proc_symlink(struct inode *dir, struct qstr *name,
1842                 struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle,
1843                 struct nfs_fattr *fattr)
1844 {
1845         struct nfs4_exception exception = { };
1846         int err;
1847         do {
1848                 err = nfs4_handle_exception(NFS_SERVER(dir),
1849                                 _nfs4_proc_symlink(dir, name, path, sattr,
1850                                         fhandle, fattr),
1851                                 &exception);
1852         } while (exception.retry);
1853         return err;
1854 }
1855
1856 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
1857                 struct iattr *sattr)
1858 {
1859         struct nfs_server *server = NFS_SERVER(dir);
1860         struct nfs_fh fhandle;
1861         struct nfs_fattr fattr, dir_fattr;
1862         struct nfs4_create_arg arg = {
1863                 .dir_fh = NFS_FH(dir),
1864                 .server = server,
1865                 .name = &dentry->d_name,
1866                 .attrs = sattr,
1867                 .ftype = NF4DIR,
1868                 .bitmask = server->attr_bitmask,
1869         };
1870         struct nfs4_create_res res = {
1871                 .server = server,
1872                 .fh = &fhandle,
1873                 .fattr = &fattr,
1874                 .dir_fattr = &dir_fattr,
1875         };
1876         struct rpc_message msg = {
1877                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
1878                 .rpc_argp = &arg,
1879                 .rpc_resp = &res,
1880         };
1881         int                     status;
1882
1883         nfs_fattr_init(&fattr);
1884         nfs_fattr_init(&dir_fattr);
1885         
1886         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1887         if (!status) {
1888                 update_changeattr(dir, &res.dir_cinfo);
1889                 nfs_post_op_update_inode(dir, res.dir_fattr);
1890                 status = nfs_instantiate(dentry, &fhandle, &fattr);
1891         }
1892         return status;
1893 }
1894
1895 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
1896                 struct iattr *sattr)
1897 {
1898         struct nfs4_exception exception = { };
1899         int err;
1900         do {
1901                 err = nfs4_handle_exception(NFS_SERVER(dir),
1902                                 _nfs4_proc_mkdir(dir, dentry, sattr),
1903                                 &exception);
1904         } while (exception.retry);
1905         return err;
1906 }
1907
1908 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
1909                   u64 cookie, struct page *page, unsigned int count, int plus)
1910 {
1911         struct inode            *dir = dentry->d_inode;
1912         struct nfs4_readdir_arg args = {
1913                 .fh = NFS_FH(dir),
1914                 .pages = &page,
1915                 .pgbase = 0,
1916                 .count = count,
1917                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
1918         };
1919         struct nfs4_readdir_res res;
1920         struct rpc_message msg = {
1921                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
1922                 .rpc_argp = &args,
1923                 .rpc_resp = &res,
1924                 .rpc_cred = cred,
1925         };
1926         int                     status;
1927
1928         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
1929                         dentry->d_parent->d_name.name,
1930                         dentry->d_name.name,
1931                         (unsigned long long)cookie);
1932         lock_kernel();
1933         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
1934         res.pgbase = args.pgbase;
1935         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1936         if (status == 0)
1937                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
1938         unlock_kernel();
1939         dprintk("%s: returns %d\n", __FUNCTION__, status);
1940         return status;
1941 }
1942
1943 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
1944                   u64 cookie, struct page *page, unsigned int count, int plus)
1945 {
1946         struct nfs4_exception exception = { };
1947         int err;
1948         do {
1949                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
1950                                 _nfs4_proc_readdir(dentry, cred, cookie,
1951                                         page, count, plus),
1952                                 &exception);
1953         } while (exception.retry);
1954         return err;
1955 }
1956
1957 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
1958                 struct iattr *sattr, dev_t rdev)
1959 {
1960         struct nfs_server *server = NFS_SERVER(dir);
1961         struct nfs_fh fh;
1962         struct nfs_fattr fattr, dir_fattr;
1963         struct nfs4_create_arg arg = {
1964                 .dir_fh = NFS_FH(dir),
1965                 .server = server,
1966                 .name = &dentry->d_name,
1967                 .attrs = sattr,
1968                 .bitmask = server->attr_bitmask,
1969         };
1970         struct nfs4_create_res res = {
1971                 .server = server,
1972                 .fh = &fh,
1973                 .fattr = &fattr,
1974                 .dir_fattr = &dir_fattr,
1975         };
1976         struct rpc_message msg = {
1977                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
1978                 .rpc_argp = &arg,
1979                 .rpc_resp = &res,
1980         };
1981         int                     status;
1982         int                     mode = sattr->ia_mode;
1983
1984         nfs_fattr_init(&fattr);
1985         nfs_fattr_init(&dir_fattr);
1986
1987         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
1988         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
1989         if (S_ISFIFO(mode))
1990                 arg.ftype = NF4FIFO;
1991         else if (S_ISBLK(mode)) {
1992                 arg.ftype = NF4BLK;
1993                 arg.u.device.specdata1 = MAJOR(rdev);
1994                 arg.u.device.specdata2 = MINOR(rdev);
1995         }
1996         else if (S_ISCHR(mode)) {
1997                 arg.ftype = NF4CHR;
1998                 arg.u.device.specdata1 = MAJOR(rdev);
1999                 arg.u.device.specdata2 = MINOR(rdev);
2000         }
2001         else
2002                 arg.ftype = NF4SOCK;
2003         
2004         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2005         if (status == 0) {
2006                 update_changeattr(dir, &res.dir_cinfo);
2007                 nfs_post_op_update_inode(dir, res.dir_fattr);
2008                 status = nfs_instantiate(dentry, &fh, &fattr);
2009         }
2010         return status;
2011 }
2012
2013 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2014                 struct iattr *sattr, dev_t rdev)
2015 {
2016         struct nfs4_exception exception = { };
2017         int err;
2018         do {
2019                 err = nfs4_handle_exception(NFS_SERVER(dir),
2020                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2021                                 &exception);
2022         } while (exception.retry);
2023         return err;
2024 }
2025
2026 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2027                  struct nfs_fsstat *fsstat)
2028 {
2029         struct nfs4_statfs_arg args = {
2030                 .fh = fhandle,
2031                 .bitmask = server->attr_bitmask,
2032         };
2033         struct rpc_message msg = {
2034                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2035                 .rpc_argp = &args,
2036                 .rpc_resp = fsstat,
2037         };
2038
2039         nfs_fattr_init(fsstat->fattr);
2040         return rpc_call_sync(server->client, &msg, 0);
2041 }
2042
2043 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2044 {
2045         struct nfs4_exception exception = { };
2046         int err;
2047         do {
2048                 err = nfs4_handle_exception(server,
2049                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2050                                 &exception);
2051         } while (exception.retry);
2052         return err;
2053 }
2054
2055 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2056                 struct nfs_fsinfo *fsinfo)
2057 {
2058         struct nfs4_fsinfo_arg args = {
2059                 .fh = fhandle,
2060                 .bitmask = server->attr_bitmask,
2061         };
2062         struct rpc_message msg = {
2063                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2064                 .rpc_argp = &args,
2065                 .rpc_resp = fsinfo,
2066         };
2067
2068         return rpc_call_sync(server->client, &msg, 0);
2069 }
2070
2071 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2072 {
2073         struct nfs4_exception exception = { };
2074         int err;
2075
2076         do {
2077                 err = nfs4_handle_exception(server,
2078                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2079                                 &exception);
2080         } while (exception.retry);
2081         return err;
2082 }
2083
2084 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2085 {
2086         nfs_fattr_init(fsinfo->fattr);
2087         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2088 }
2089
2090 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2091                 struct nfs_pathconf *pathconf)
2092 {
2093         struct nfs4_pathconf_arg args = {
2094                 .fh = fhandle,
2095                 .bitmask = server->attr_bitmask,
2096         };
2097         struct rpc_message msg = {
2098                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2099                 .rpc_argp = &args,
2100                 .rpc_resp = pathconf,
2101         };
2102
2103         /* None of the pathconf attributes are mandatory to implement */
2104         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2105                 memset(pathconf, 0, sizeof(*pathconf));
2106                 return 0;
2107         }
2108
2109         nfs_fattr_init(pathconf->fattr);
2110         return rpc_call_sync(server->client, &msg, 0);
2111 }
2112
2113 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2114                 struct nfs_pathconf *pathconf)
2115 {
2116         struct nfs4_exception exception = { };
2117         int err;
2118
2119         do {
2120                 err = nfs4_handle_exception(server,
2121                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2122                                 &exception);
2123         } while (exception.retry);
2124         return err;
2125 }
2126
2127 static void nfs4_read_done(struct rpc_task *task, void *calldata)
2128 {
2129         struct nfs_read_data *data = calldata;
2130         struct inode *inode = data->inode;
2131
2132         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2133                 rpc_restart_call(task);
2134                 return;
2135         }
2136         if (task->tk_status > 0)
2137                 renew_lease(NFS_SERVER(inode), data->timestamp);
2138         /* Call back common NFS readpage processing */
2139         nfs_readpage_result(task, calldata);
2140 }
2141
2142 static const struct rpc_call_ops nfs4_read_ops = {
2143         .rpc_call_done = nfs4_read_done,
2144         .rpc_release = nfs_readdata_release,
2145 };
2146
2147 static void
2148 nfs4_proc_read_setup(struct nfs_read_data *data)
2149 {
2150         struct rpc_task *task = &data->task;
2151         struct rpc_message msg = {
2152                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
2153                 .rpc_argp = &data->args,
2154                 .rpc_resp = &data->res,
2155                 .rpc_cred = data->cred,
2156         };
2157         struct inode *inode = data->inode;
2158         int flags;
2159
2160         data->timestamp   = jiffies;
2161
2162         /* N.B. Do we need to test? Never called for swapfile inode */
2163         flags = RPC_TASK_ASYNC | (IS_SWAPFILE(inode)? NFS_RPC_SWAPFLAGS : 0);
2164
2165         /* Finalize the task. */
2166         rpc_init_task(task, NFS_CLIENT(inode), flags, &nfs4_read_ops, data);
2167         rpc_call_setup(task, &msg, 0);
2168 }
2169
2170 static void nfs4_write_done(struct rpc_task *task, void *calldata)
2171 {
2172         struct nfs_write_data *data = calldata;
2173         struct inode *inode = data->inode;
2174         
2175         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2176                 rpc_restart_call(task);
2177                 return;
2178         }
2179         if (task->tk_status >= 0) {
2180                 renew_lease(NFS_SERVER(inode), data->timestamp);
2181                 nfs_post_op_update_inode(inode, data->res.fattr);
2182         }
2183         /* Call back common NFS writeback processing */
2184         nfs_writeback_done(task, calldata);
2185 }
2186
2187 static const struct rpc_call_ops nfs4_write_ops = {
2188         .rpc_call_done = nfs4_write_done,
2189         .rpc_release = nfs_writedata_release,
2190 };
2191
2192 static void
2193 nfs4_proc_write_setup(struct nfs_write_data *data, int how)
2194 {
2195         struct rpc_task *task = &data->task;
2196         struct rpc_message msg = {
2197                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
2198                 .rpc_argp = &data->args,
2199                 .rpc_resp = &data->res,
2200                 .rpc_cred = data->cred,
2201         };
2202         struct inode *inode = data->inode;
2203         struct nfs_server *server = NFS_SERVER(inode);
2204         int stable;
2205         int flags;
2206         
2207         if (how & FLUSH_STABLE) {
2208                 if (!NFS_I(inode)->ncommit)
2209                         stable = NFS_FILE_SYNC;
2210                 else
2211                         stable = NFS_DATA_SYNC;
2212         } else
2213                 stable = NFS_UNSTABLE;
2214         data->args.stable = stable;
2215         data->args.bitmask = server->attr_bitmask;
2216         data->res.server = server;
2217
2218         data->timestamp   = jiffies;
2219
2220         /* Set the initial flags for the task.  */
2221         flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
2222
2223         /* Finalize the task. */
2224         rpc_init_task(task, NFS_CLIENT(inode), flags, &nfs4_write_ops, data);
2225         rpc_call_setup(task, &msg, 0);
2226 }
2227
2228 static void nfs4_commit_done(struct rpc_task *task, void *calldata)
2229 {
2230         struct nfs_write_data *data = calldata;
2231         struct inode *inode = data->inode;
2232         
2233         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2234                 rpc_restart_call(task);
2235                 return;
2236         }
2237         if (task->tk_status >= 0)
2238                 nfs_post_op_update_inode(inode, data->res.fattr);
2239         /* Call back common NFS writeback processing */
2240         nfs_commit_done(task, calldata);
2241 }
2242
2243 static const struct rpc_call_ops nfs4_commit_ops = {
2244         .rpc_call_done = nfs4_commit_done,
2245         .rpc_release = nfs_commit_release,
2246 };
2247
2248 static void
2249 nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
2250 {
2251         struct rpc_task *task = &data->task;
2252         struct rpc_message msg = {
2253                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2254                 .rpc_argp = &data->args,
2255                 .rpc_resp = &data->res,
2256                 .rpc_cred = data->cred,
2257         };      
2258         struct inode *inode = data->inode;
2259         struct nfs_server *server = NFS_SERVER(inode);
2260         int flags;
2261         
2262         data->args.bitmask = server->attr_bitmask;
2263         data->res.server = server;
2264
2265         /* Set the initial flags for the task.  */
2266         flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
2267
2268         /* Finalize the task. */
2269         rpc_init_task(task, NFS_CLIENT(inode), flags, &nfs4_commit_ops, data);
2270         rpc_call_setup(task, &msg, 0);  
2271 }
2272
2273 /*
2274  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2275  * standalone procedure for queueing an asynchronous RENEW.
2276  */
2277 static void nfs4_renew_done(struct rpc_task *task, void *data)
2278 {
2279         struct nfs4_client *clp = (struct nfs4_client *)task->tk_msg.rpc_argp;
2280         unsigned long timestamp = (unsigned long)data;
2281
2282         if (task->tk_status < 0) {
2283                 switch (task->tk_status) {
2284                         case -NFS4ERR_STALE_CLIENTID:
2285                         case -NFS4ERR_EXPIRED:
2286                         case -NFS4ERR_CB_PATH_DOWN:
2287                                 nfs4_schedule_state_recovery(clp);
2288                 }
2289                 return;
2290         }
2291         spin_lock(&clp->cl_lock);
2292         if (time_before(clp->cl_last_renewal,timestamp))
2293                 clp->cl_last_renewal = timestamp;
2294         spin_unlock(&clp->cl_lock);
2295 }
2296
2297 static const struct rpc_call_ops nfs4_renew_ops = {
2298         .rpc_call_done = nfs4_renew_done,
2299 };
2300
2301 int
2302 nfs4_proc_async_renew(struct nfs4_client *clp)
2303 {
2304         struct rpc_message msg = {
2305                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2306                 .rpc_argp       = clp,
2307                 .rpc_cred       = clp->cl_cred,
2308         };
2309
2310         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2311                         &nfs4_renew_ops, (void *)jiffies);
2312 }
2313
2314 int
2315 nfs4_proc_renew(struct nfs4_client *clp)
2316 {
2317         struct rpc_message msg = {
2318                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2319                 .rpc_argp       = clp,
2320                 .rpc_cred       = clp->cl_cred,
2321         };
2322         unsigned long now = jiffies;
2323         int status;
2324
2325         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2326         if (status < 0)
2327                 return status;
2328         spin_lock(&clp->cl_lock);
2329         if (time_before(clp->cl_last_renewal,now))
2330                 clp->cl_last_renewal = now;
2331         spin_unlock(&clp->cl_lock);
2332         return 0;
2333 }
2334
2335 static inline int nfs4_server_supports_acls(struct nfs_server *server)
2336 {
2337         return (server->caps & NFS_CAP_ACLS)
2338                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2339                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2340 }
2341
2342 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2343  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2344  * the stack.
2345  */
2346 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2347
2348 static void buf_to_pages(const void *buf, size_t buflen,
2349                 struct page **pages, unsigned int *pgbase)
2350 {
2351         const void *p = buf;
2352
2353         *pgbase = offset_in_page(buf);
2354         p -= *pgbase;
2355         while (p < buf + buflen) {
2356                 *(pages++) = virt_to_page(p);
2357                 p += PAGE_CACHE_SIZE;
2358         }
2359 }
2360
2361 struct nfs4_cached_acl {
2362         int cached;
2363         size_t len;
2364         char data[0];
2365 };
2366
2367 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2368 {
2369         struct nfs_inode *nfsi = NFS_I(inode);
2370
2371         spin_lock(&inode->i_lock);
2372         kfree(nfsi->nfs4_acl);
2373         nfsi->nfs4_acl = acl;
2374         spin_unlock(&inode->i_lock);
2375 }
2376
2377 static void nfs4_zap_acl_attr(struct inode *inode)
2378 {
2379         nfs4_set_cached_acl(inode, NULL);
2380 }
2381
2382 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2383 {
2384         struct nfs_inode *nfsi = NFS_I(inode);
2385         struct nfs4_cached_acl *acl;
2386         int ret = -ENOENT;
2387
2388         spin_lock(&inode->i_lock);
2389         acl = nfsi->nfs4_acl;
2390         if (acl == NULL)
2391                 goto out;
2392         if (buf == NULL) /* user is just asking for length */
2393                 goto out_len;
2394         if (acl->cached == 0)
2395                 goto out;
2396         ret = -ERANGE; /* see getxattr(2) man page */
2397         if (acl->len > buflen)
2398                 goto out;
2399         memcpy(buf, acl->data, acl->len);
2400 out_len:
2401         ret = acl->len;
2402 out:
2403         spin_unlock(&inode->i_lock);
2404         return ret;
2405 }
2406
2407 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2408 {
2409         struct nfs4_cached_acl *acl;
2410
2411         if (buf && acl_len <= PAGE_SIZE) {
2412                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2413                 if (acl == NULL)
2414                         goto out;
2415                 acl->cached = 1;
2416                 memcpy(acl->data, buf, acl_len);
2417         } else {
2418                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2419                 if (acl == NULL)
2420                         goto out;
2421                 acl->cached = 0;
2422         }
2423         acl->len = acl_len;
2424 out:
2425         nfs4_set_cached_acl(inode, acl);
2426 }
2427
2428 static inline ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2429 {
2430         struct page *pages[NFS4ACL_MAXPAGES];
2431         struct nfs_getaclargs args = {
2432                 .fh = NFS_FH(inode),
2433                 .acl_pages = pages,
2434                 .acl_len = buflen,
2435         };
2436         size_t resp_len = buflen;
2437         void *resp_buf;
2438         struct rpc_message msg = {
2439                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2440                 .rpc_argp = &args,
2441                 .rpc_resp = &resp_len,
2442         };
2443         struct page *localpage = NULL;
2444         int ret;
2445
2446         if (buflen < PAGE_SIZE) {
2447                 /* As long as we're doing a round trip to the server anyway,
2448                  * let's be prepared for a page of acl data. */
2449                 localpage = alloc_page(GFP_KERNEL);
2450                 resp_buf = page_address(localpage);
2451                 if (localpage == NULL)
2452                         return -ENOMEM;
2453                 args.acl_pages[0] = localpage;
2454                 args.acl_pgbase = 0;
2455                 resp_len = args.acl_len = PAGE_SIZE;
2456         } else {
2457                 resp_buf = buf;
2458                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2459         }
2460         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2461         if (ret)
2462                 goto out_free;
2463         if (resp_len > args.acl_len)
2464                 nfs4_write_cached_acl(inode, NULL, resp_len);
2465         else
2466                 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2467         if (buf) {
2468                 ret = -ERANGE;
2469                 if (resp_len > buflen)
2470                         goto out_free;
2471                 if (localpage)
2472                         memcpy(buf, resp_buf, resp_len);
2473         }
2474         ret = resp_len;
2475 out_free:
2476         if (localpage)
2477                 __free_page(localpage);
2478         return ret;
2479 }
2480
2481 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2482 {
2483         struct nfs_server *server = NFS_SERVER(inode);
2484         int ret;
2485
2486         if (!nfs4_server_supports_acls(server))
2487                 return -EOPNOTSUPP;
2488         ret = nfs_revalidate_inode(server, inode);
2489         if (ret < 0)
2490                 return ret;
2491         ret = nfs4_read_cached_acl(inode, buf, buflen);
2492         if (ret != -ENOENT)
2493                 return ret;
2494         return nfs4_get_acl_uncached(inode, buf, buflen);
2495 }
2496
2497 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2498 {
2499         struct nfs_server *server = NFS_SERVER(inode);
2500         struct page *pages[NFS4ACL_MAXPAGES];
2501         struct nfs_setaclargs arg = {
2502                 .fh             = NFS_FH(inode),
2503                 .acl_pages      = pages,
2504                 .acl_len        = buflen,
2505         };
2506         struct rpc_message msg = {
2507                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2508                 .rpc_argp       = &arg,
2509                 .rpc_resp       = NULL,
2510         };
2511         int ret;
2512
2513         if (!nfs4_server_supports_acls(server))
2514                 return -EOPNOTSUPP;
2515         nfs_inode_return_delegation(inode);
2516         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2517         ret = rpc_call_sync(NFS_SERVER(inode)->client, &msg, 0);
2518         if (ret == 0)
2519                 nfs4_write_cached_acl(inode, buf, buflen);
2520         return ret;
2521 }
2522
2523 static int
2524 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
2525 {
2526         struct nfs4_client *clp = server->nfs4_state;
2527
2528         if (!clp || task->tk_status >= 0)
2529                 return 0;
2530         switch(task->tk_status) {
2531                 case -NFS4ERR_STALE_CLIENTID:
2532                 case -NFS4ERR_STALE_STATEID:
2533                 case -NFS4ERR_EXPIRED:
2534                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2535                         nfs4_schedule_state_recovery(clp);
2536                         if (test_bit(NFS4CLNT_OK, &clp->cl_state))
2537                                 rpc_wake_up_task(task);
2538                         task->tk_status = 0;
2539                         return -EAGAIN;
2540                 case -NFS4ERR_GRACE:
2541                 case -NFS4ERR_DELAY:
2542                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
2543                         task->tk_status = 0;
2544                         return -EAGAIN;
2545                 case -NFS4ERR_OLD_STATEID:
2546                         task->tk_status = 0;
2547                         return -EAGAIN;
2548         }
2549         task->tk_status = nfs4_map_errors(task->tk_status);
2550         return 0;
2551 }
2552
2553 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs4_client *clp)
2554 {
2555         DEFINE_WAIT(wait);
2556         sigset_t oldset;
2557         int interruptible, res = 0;
2558
2559         might_sleep();
2560
2561         rpc_clnt_sigmask(clnt, &oldset);
2562         interruptible = TASK_UNINTERRUPTIBLE;
2563         if (clnt->cl_intr)
2564                 interruptible = TASK_INTERRUPTIBLE;
2565         prepare_to_wait(&clp->cl_waitq, &wait, interruptible);
2566         nfs4_schedule_state_recovery(clp);
2567         if (clnt->cl_intr && signalled())
2568                 res = -ERESTARTSYS;
2569         else if (!test_bit(NFS4CLNT_OK, &clp->cl_state))
2570                 schedule();
2571         finish_wait(&clp->cl_waitq, &wait);
2572         rpc_clnt_sigunmask(clnt, &oldset);
2573         return res;
2574 }
2575
2576 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2577 {
2578         sigset_t oldset;
2579         int res = 0;
2580
2581         might_sleep();
2582
2583         if (*timeout <= 0)
2584                 *timeout = NFS4_POLL_RETRY_MIN;
2585         if (*timeout > NFS4_POLL_RETRY_MAX)
2586                 *timeout = NFS4_POLL_RETRY_MAX;
2587         rpc_clnt_sigmask(clnt, &oldset);
2588         if (clnt->cl_intr) {
2589                 schedule_timeout_interruptible(*timeout);
2590                 if (signalled())
2591                         res = -ERESTARTSYS;
2592         } else
2593                 schedule_timeout_uninterruptible(*timeout);
2594         rpc_clnt_sigunmask(clnt, &oldset);
2595         *timeout <<= 1;
2596         return res;
2597 }
2598
2599 /* This is the error handling routine for processes that are allowed
2600  * to sleep.
2601  */
2602 int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
2603 {
2604         struct nfs4_client *clp = server->nfs4_state;
2605         int ret = errorcode;
2606
2607         exception->retry = 0;
2608         switch(errorcode) {
2609                 case 0:
2610                         return 0;
2611                 case -NFS4ERR_STALE_CLIENTID:
2612                 case -NFS4ERR_STALE_STATEID:
2613                 case -NFS4ERR_EXPIRED:
2614                         ret = nfs4_wait_clnt_recover(server->client, clp);
2615                         if (ret == 0)
2616                                 exception->retry = 1;
2617                         break;
2618                 case -NFS4ERR_GRACE:
2619                 case -NFS4ERR_DELAY:
2620                         ret = nfs4_delay(server->client, &exception->timeout);
2621                         if (ret != 0)
2622                                 break;
2623                 case -NFS4ERR_OLD_STATEID:
2624                         exception->retry = 1;
2625         }
2626         /* We failed to handle the error */
2627         return nfs4_map_errors(ret);
2628 }
2629
2630 int nfs4_proc_setclientid(struct nfs4_client *clp, u32 program, unsigned short port)
2631 {
2632         nfs4_verifier sc_verifier;
2633         struct nfs4_setclientid setclientid = {
2634                 .sc_verifier = &sc_verifier,
2635                 .sc_prog = program,
2636         };
2637         struct rpc_message msg = {
2638                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2639                 .rpc_argp = &setclientid,
2640                 .rpc_resp = clp,
2641                 .rpc_cred = clp->cl_cred,
2642         };
2643         u32 *p;
2644         int loop = 0;
2645         int status;
2646
2647         p = (u32*)sc_verifier.data;
2648         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2649         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2650
2651         for(;;) {
2652                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2653                                 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
2654                                 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.s_addr),
2655                                 clp->cl_cred->cr_ops->cr_name,
2656                                 clp->cl_id_uniquifier);
2657                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2658                                 sizeof(setclientid.sc_netid), "tcp");
2659                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2660                                 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2661                                 clp->cl_ipaddr, port >> 8, port & 255);
2662
2663                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2664                 if (status != -NFS4ERR_CLID_INUSE)
2665                         break;
2666                 if (signalled())
2667                         break;
2668                 if (loop++ & 1)
2669                         ssleep(clp->cl_lease_time + 1);
2670                 else
2671                         if (++clp->cl_id_uniquifier == 0)
2672                                 break;
2673         }
2674         return status;
2675 }
2676
2677 int
2678 nfs4_proc_setclientid_confirm(struct nfs4_client *clp)
2679 {
2680         struct nfs_fsinfo fsinfo;
2681         struct rpc_message msg = {
2682                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2683                 .rpc_argp = clp,
2684                 .rpc_resp = &fsinfo,
2685                 .rpc_cred = clp->cl_cred,
2686         };
2687         unsigned long now;
2688         int status;
2689
2690         now = jiffies;
2691         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2692         if (status == 0) {
2693                 spin_lock(&clp->cl_lock);
2694                 clp->cl_lease_time = fsinfo.lease_time * HZ;
2695                 clp->cl_last_renewal = now;
2696                 spin_unlock(&clp->cl_lock);
2697         }
2698         return status;
2699 }
2700
2701 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2702 {
2703         struct nfs4_delegreturnargs args = {
2704                 .fhandle = NFS_FH(inode),
2705                 .stateid = stateid,
2706         };
2707         struct rpc_message msg = {
2708                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
2709                 .rpc_argp = &args,
2710                 .rpc_cred = cred,
2711         };
2712
2713         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2714 }
2715
2716 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2717 {
2718         struct nfs_server *server = NFS_SERVER(inode);
2719         struct nfs4_exception exception = { };
2720         int err;
2721         do {
2722                 err = _nfs4_proc_delegreturn(inode, cred, stateid);
2723                 switch (err) {
2724                         case -NFS4ERR_STALE_STATEID:
2725                         case -NFS4ERR_EXPIRED:
2726                                 nfs4_schedule_state_recovery(server->nfs4_state);
2727                         case 0:
2728                                 return 0;
2729                 }
2730                 err = nfs4_handle_exception(server, err, &exception);
2731         } while (exception.retry);
2732         return err;
2733 }
2734
2735 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
2736 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
2737
2738 /* 
2739  * sleep, with exponential backoff, and retry the LOCK operation. 
2740  */
2741 static unsigned long
2742 nfs4_set_lock_task_retry(unsigned long timeout)
2743 {
2744         schedule_timeout_interruptible(timeout);
2745         timeout <<= 1;
2746         if (timeout > NFS4_LOCK_MAXTIMEOUT)
2747                 return NFS4_LOCK_MAXTIMEOUT;
2748         return timeout;
2749 }
2750
2751 static inline int
2752 nfs4_lck_type(int cmd, struct file_lock *request)
2753 {
2754         /* set lock type */
2755         switch (request->fl_type) {
2756                 case F_RDLCK:
2757                         return IS_SETLKW(cmd) ? NFS4_READW_LT : NFS4_READ_LT;
2758                 case F_WRLCK:
2759                         return IS_SETLKW(cmd) ? NFS4_WRITEW_LT : NFS4_WRITE_LT;
2760                 case F_UNLCK:
2761                         return NFS4_WRITE_LT; 
2762         }
2763         BUG();
2764         return 0;
2765 }
2766
2767 static inline uint64_t
2768 nfs4_lck_length(struct file_lock *request)
2769 {
2770         if (request->fl_end == OFFSET_MAX)
2771                 return ~(uint64_t)0;
2772         return request->fl_end - request->fl_start + 1;
2773 }
2774
2775 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
2776 {
2777         struct inode *inode = state->inode;
2778         struct nfs_server *server = NFS_SERVER(inode);
2779         struct nfs4_client *clp = server->nfs4_state;
2780         struct nfs_lockargs arg = {
2781                 .fh = NFS_FH(inode),
2782                 .type = nfs4_lck_type(cmd, request),
2783                 .offset = request->fl_start,
2784                 .length = nfs4_lck_length(request),
2785         };
2786         struct nfs_lockres res = {
2787                 .server = server,
2788         };
2789         struct rpc_message msg = {
2790                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
2791                 .rpc_argp       = &arg,
2792                 .rpc_resp       = &res,
2793                 .rpc_cred       = state->owner->so_cred,
2794         };
2795         struct nfs_lowner nlo;
2796         struct nfs4_lock_state *lsp;
2797         int status;
2798
2799         down_read(&clp->cl_sem);
2800         nlo.clientid = clp->cl_clientid;
2801         status = nfs4_set_lock_state(state, request);
2802         if (status != 0)
2803                 goto out;
2804         lsp = request->fl_u.nfs4_fl.owner;
2805         nlo.id = lsp->ls_id; 
2806         arg.u.lockt = &nlo;
2807         status = rpc_call_sync(server->client, &msg, 0);
2808         if (!status) {
2809                 request->fl_type = F_UNLCK;
2810         } else if (status == -NFS4ERR_DENIED) {
2811                 int64_t len, start, end;
2812                 start = res.u.denied.offset;
2813                 len = res.u.denied.length;
2814                 end = start + len - 1;
2815                 if (end < 0 || len == 0)
2816                         request->fl_end = OFFSET_MAX;
2817                 else
2818                         request->fl_end = (loff_t)end;
2819                 request->fl_start = (loff_t)start;
2820                 request->fl_type = F_WRLCK;
2821                 if (res.u.denied.type & 1)
2822                         request->fl_type = F_RDLCK;
2823                 request->fl_pid = 0;
2824                 status = 0;
2825         }
2826 out:
2827         up_read(&clp->cl_sem);
2828         return status;
2829 }
2830
2831 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
2832 {
2833         struct nfs4_exception exception = { };
2834         int err;
2835
2836         do {
2837                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
2838                                 _nfs4_proc_getlk(state, cmd, request),
2839                                 &exception);
2840         } while (exception.retry);
2841         return err;
2842 }
2843
2844 static int do_vfs_lock(struct file *file, struct file_lock *fl)
2845 {
2846         int res = 0;
2847         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
2848                 case FL_POSIX:
2849                         res = posix_lock_file_wait(file, fl);
2850                         break;
2851                 case FL_FLOCK:
2852                         res = flock_lock_file_wait(file, fl);
2853                         break;
2854                 default:
2855                         BUG();
2856         }
2857         if (res < 0)
2858                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n",
2859                                 __FUNCTION__);
2860         return res;
2861 }
2862
2863 struct nfs4_unlockdata {
2864         struct nfs_lockargs arg;
2865         struct nfs_locku_opargs luargs;
2866         struct nfs_lockres res;
2867         struct nfs4_lock_state *lsp;
2868         struct nfs_open_context *ctx;
2869         atomic_t refcount;
2870         struct completion completion;
2871 };
2872
2873 static void nfs4_locku_release_calldata(struct nfs4_unlockdata *calldata)
2874 {
2875         if (atomic_dec_and_test(&calldata->refcount)) {
2876                 nfs_free_seqid(calldata->luargs.seqid);
2877                 nfs4_put_lock_state(calldata->lsp);
2878                 put_nfs_open_context(calldata->ctx);
2879                 kfree(calldata);
2880         }
2881 }
2882
2883 static void nfs4_locku_complete(void *data)
2884 {
2885         struct nfs4_unlockdata *calldata = data;
2886         complete(&calldata->completion);
2887         nfs4_locku_release_calldata(calldata);
2888 }
2889
2890 static void nfs4_locku_done(struct rpc_task *task, void *data)
2891 {
2892         struct nfs4_unlockdata *calldata = data;
2893
2894         nfs_increment_lock_seqid(task->tk_status, calldata->luargs.seqid);
2895         switch (task->tk_status) {
2896                 case 0:
2897                         memcpy(calldata->lsp->ls_stateid.data,
2898                                         calldata->res.u.stateid.data,
2899                                         sizeof(calldata->lsp->ls_stateid.data));
2900                         break;
2901                 case -NFS4ERR_STALE_STATEID:
2902                 case -NFS4ERR_EXPIRED:
2903                         nfs4_schedule_state_recovery(calldata->res.server->nfs4_state);
2904                         break;
2905                 default:
2906                         if (nfs4_async_handle_error(task, calldata->res.server) == -EAGAIN) {
2907                                 rpc_restart_call(task);
2908                         }
2909         }
2910 }
2911
2912 static void nfs4_locku_begin(struct rpc_task *task)
2913 {
2914         struct nfs4_unlockdata *calldata = (struct nfs4_unlockdata *)task->tk_calldata;
2915         struct rpc_message msg = {
2916                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
2917                 .rpc_argp       = &calldata->arg,
2918                 .rpc_resp       = &calldata->res,
2919                 .rpc_cred       = calldata->lsp->ls_state->owner->so_cred,
2920         };
2921         int status;
2922
2923         status = nfs_wait_on_sequence(calldata->luargs.seqid, task);
2924         if (status != 0)
2925                 return;
2926         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
2927                 /* Note: exit _without_ running nfs4_locku_done */
2928                 task->tk_action = NULL;
2929                 return;
2930         }
2931         rpc_call_setup(task, &msg, 0);
2932 }
2933
2934 static const struct rpc_call_ops nfs4_locku_ops = {
2935         .rpc_call_done = nfs4_locku_done,
2936         .rpc_release = nfs4_locku_complete,
2937 };
2938
2939 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
2940 {
2941         struct nfs4_unlockdata *calldata;
2942         struct inode *inode = state->inode;
2943         struct nfs_server *server = NFS_SERVER(inode);
2944         struct nfs4_lock_state *lsp;
2945         int status;
2946
2947         /* Is this a delegated lock? */
2948         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
2949                 return do_vfs_lock(request->fl_file, request);
2950
2951         status = nfs4_set_lock_state(state, request);
2952         if (status != 0)
2953                 return status;
2954         lsp = request->fl_u.nfs4_fl.owner;
2955         /* We might have lost the locks! */
2956         if ((lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0)
2957                 return 0;
2958         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
2959         if (calldata == NULL)
2960                 return -ENOMEM;
2961         calldata->luargs.seqid = nfs_alloc_seqid(&lsp->ls_seqid);
2962         if (calldata->luargs.seqid == NULL) {
2963                 kfree(calldata);
2964                 return -ENOMEM;
2965         }
2966         calldata->luargs.stateid = &lsp->ls_stateid;
2967         calldata->arg.fh = NFS_FH(inode);
2968         calldata->arg.type = nfs4_lck_type(cmd, request);
2969         calldata->arg.offset = request->fl_start;
2970         calldata->arg.length = nfs4_lck_length(request);
2971         calldata->arg.u.locku = &calldata->luargs;
2972         calldata->res.server = server;
2973         calldata->lsp = lsp;
2974         atomic_inc(&lsp->ls_count);
2975
2976         /* Ensure we don't close file until we're done freeing locks! */
2977         calldata->ctx = get_nfs_open_context((struct nfs_open_context*)request->fl_file->private_data);
2978
2979         atomic_set(&calldata->refcount, 2);
2980         init_completion(&calldata->completion);
2981
2982         status = nfs4_call_async(NFS_SERVER(inode)->client, nfs4_locku_begin,
2983                         &nfs4_locku_ops, calldata);
2984         if (status == 0)
2985                 wait_for_completion_interruptible(&calldata->completion);
2986         do_vfs_lock(request->fl_file, request);
2987         nfs4_locku_release_calldata(calldata);
2988         return status;
2989 }
2990
2991 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *request, int reclaim)
2992 {
2993         struct inode *inode = state->inode;
2994         struct nfs_server *server = NFS_SERVER(inode);
2995         struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner;
2996         struct nfs_lock_opargs largs = {
2997                 .lock_stateid = &lsp->ls_stateid,
2998                 .open_stateid = &state->stateid,
2999                 .lock_owner = {
3000                         .clientid = server->nfs4_state->cl_clientid,
3001                         .id = lsp->ls_id,
3002                 },
3003                 .reclaim = reclaim,
3004         };
3005         struct nfs_lockargs arg = {
3006                 .fh = NFS_FH(inode),
3007                 .type = nfs4_lck_type(cmd, request),
3008                 .offset = request->fl_start,
3009                 .length = nfs4_lck_length(request),
3010                 .u = {
3011                         .lock = &largs,
3012                 },
3013         };
3014         struct nfs_lockres res = {
3015                 .server = server,
3016         };
3017         struct rpc_message msg = {
3018                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3019                 .rpc_argp       = &arg,
3020                 .rpc_resp       = &res,
3021                 .rpc_cred       = state->owner->so_cred,
3022         };
3023         int status = -ENOMEM;
3024
3025         largs.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3026         if (largs.lock_seqid == NULL)
3027                 return -ENOMEM;
3028         if (!(lsp->ls_seqid.flags & NFS_SEQID_CONFIRMED)) {
3029                 struct nfs4_state_owner *owner = state->owner;
3030
3031                 largs.open_seqid = nfs_alloc_seqid(&owner->so_seqid);
3032                 if (largs.open_seqid == NULL)
3033                         goto out;
3034                 largs.new_lock_owner = 1;
3035                 status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
3036                 /* increment open seqid on success, and seqid mutating errors */
3037                 if (largs.new_lock_owner != 0) {
3038                         nfs_increment_open_seqid(status, largs.open_seqid);
3039                         if (status == 0)
3040                                 nfs_confirm_seqid(&lsp->ls_seqid, 0);
3041                 }
3042                 nfs_free_seqid(largs.open_seqid);
3043         } else
3044                 status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
3045         /* increment lock seqid on success, and seqid mutating errors*/
3046         nfs_increment_lock_seqid(status, largs.lock_seqid);
3047         /* save the returned stateid. */
3048         if (status == 0) {
3049                 memcpy(lsp->ls_stateid.data, res.u.stateid.data,
3050                                 sizeof(lsp->ls_stateid.data));
3051                 lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3052         } else if (status == -NFS4ERR_DENIED)
3053                 status = -EAGAIN;
3054 out:
3055         nfs_free_seqid(largs.lock_seqid);
3056         return status;
3057 }
3058
3059 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3060 {
3061         struct nfs_server *server = NFS_SERVER(state->inode);
3062         struct nfs4_exception exception = { };
3063         int err;
3064
3065         /* Cache the lock if possible... */
3066         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3067                 return 0;
3068         do {
3069                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3070                 if (err != -NFS4ERR_DELAY)
3071                         break;
3072                 nfs4_handle_exception(server, err, &exception);
3073         } while (exception.retry);
3074         return err;
3075 }
3076
3077 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3078 {
3079         struct nfs_server *server = NFS_SERVER(state->inode);
3080         struct nfs4_exception exception = { };
3081         int err;
3082
3083         err = nfs4_set_lock_state(state, request);
3084         if (err != 0)
3085                 return err;
3086         do {
3087                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3088                 if (err != -NFS4ERR_DELAY)
3089                         break;
3090                 nfs4_handle_exception(server, err, &exception);
3091         } while (exception.retry);
3092         return err;
3093 }
3094
3095 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3096 {
3097         struct nfs4_client *clp = state->owner->so_client;
3098         int status;
3099
3100         /* Is this a delegated open? */
3101         if (NFS_I(state->inode)->delegation_state != 0) {
3102                 /* Yes: cache locks! */
3103                 status = do_vfs_lock(request->fl_file, request);
3104                 /* ...but avoid races with delegation recall... */
3105                 if (status < 0 || test_bit(NFS_DELEGATED_STATE, &state->flags))
3106                         return status;
3107         }
3108         down_read(&clp->cl_sem);
3109         status = nfs4_set_lock_state(state, request);
3110         if (status != 0)
3111                 goto out;
3112         status = _nfs4_do_setlk(state, cmd, request, 0);
3113         if (status != 0)
3114                 goto out;
3115         /* Note: we always want to sleep here! */
3116         request->fl_flags |= FL_SLEEP;
3117         if (do_vfs_lock(request->fl_file, request) < 0)
3118                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
3119 out:
3120         up_read(&clp->cl_sem);
3121         return status;
3122 }
3123
3124 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3125 {
3126         struct nfs4_exception exception = { };
3127         int err;
3128
3129         do {
3130                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3131                                 _nfs4_proc_setlk(state, cmd, request),
3132                                 &exception);
3133         } while (exception.retry);
3134         return err;
3135 }
3136
3137 static int
3138 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3139 {
3140         struct nfs_open_context *ctx;
3141         struct nfs4_state *state;
3142         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3143         int status;
3144
3145         /* verify open state */
3146         ctx = (struct nfs_open_context *)filp->private_data;
3147         state = ctx->state;
3148
3149         if (request->fl_start < 0 || request->fl_end < 0)
3150                 return -EINVAL;
3151
3152         if (IS_GETLK(cmd))
3153                 return nfs4_proc_getlk(state, F_GETLK, request);
3154
3155         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3156                 return -EINVAL;
3157
3158         if (request->fl_type == F_UNLCK)
3159                 return nfs4_proc_unlck(state, cmd, request);
3160
3161         do {
3162                 status = nfs4_proc_setlk(state, cmd, request);
3163                 if ((status != -EAGAIN) || IS_SETLK(cmd))
3164                         break;
3165                 timeout = nfs4_set_lock_task_retry(timeout);
3166                 status = -ERESTARTSYS;
3167                 if (signalled())
3168                         break;
3169         } while(status < 0);
3170         return status;
3171 }
3172
3173 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3174 {
3175         struct nfs_server *server = NFS_SERVER(state->inode);
3176         struct nfs4_exception exception = { };
3177         int err;
3178
3179         err = nfs4_set_lock_state(state, fl);
3180         if (err != 0)
3181                 goto out;
3182         do {
3183                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3184                 if (err != -NFS4ERR_DELAY)
3185                         break;
3186                 err = nfs4_handle_exception(server, err, &exception);
3187         } while (exception.retry);
3188 out:
3189         return err;
3190 }
3191
3192 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3193
3194 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3195                 size_t buflen, int flags)
3196 {
3197         struct inode *inode = dentry->d_inode;
3198
3199         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3200                 return -EOPNOTSUPP;
3201
3202         if (!S_ISREG(inode->i_mode) &&
3203             (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
3204                 return -EPERM;
3205
3206         return nfs4_proc_set_acl(inode, buf, buflen);
3207 }
3208
3209 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
3210  * and that's what we'll do for e.g. user attributes that haven't been set.
3211  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3212  * attributes in kernel-managed attribute namespaces. */
3213 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3214                 size_t buflen)
3215 {
3216         struct inode *inode = dentry->d_inode;
3217
3218         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3219                 return -EOPNOTSUPP;
3220
3221         return nfs4_proc_get_acl(inode, buf, buflen);
3222 }
3223
3224 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3225 {
3226         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
3227
3228         if (buf && buflen < len)
3229                 return -ERANGE;
3230         if (buf)
3231                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3232         return len;
3233 }
3234
3235 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3236         .recover_open   = nfs4_open_reclaim,
3237         .recover_lock   = nfs4_lock_reclaim,
3238 };
3239
3240 struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3241         .recover_open   = nfs4_open_expired,
3242         .recover_lock   = nfs4_lock_expired,
3243 };
3244
3245 static struct inode_operations nfs4_file_inode_operations = {
3246         .permission     = nfs_permission,
3247         .getattr        = nfs_getattr,
3248         .setattr        = nfs_setattr,
3249         .getxattr       = nfs4_getxattr,
3250         .setxattr       = nfs4_setxattr,
3251         .listxattr      = nfs4_listxattr,
3252 };
3253
3254 struct nfs_rpc_ops      nfs_v4_clientops = {
3255         .version        = 4,                    /* protocol version */
3256         .dentry_ops     = &nfs4_dentry_operations,
3257         .dir_inode_ops  = &nfs4_dir_inode_operations,
3258         .file_inode_ops = &nfs4_file_inode_operations,
3259         .getroot        = nfs4_proc_get_root,
3260         .getattr        = nfs4_proc_getattr,
3261         .setattr        = nfs4_proc_setattr,
3262         .lookup         = nfs4_proc_lookup,
3263         .access         = nfs4_proc_access,
3264         .readlink       = nfs4_proc_readlink,
3265         .read           = nfs4_proc_read,
3266         .write          = nfs4_proc_write,
3267         .commit         = nfs4_proc_commit,
3268         .create         = nfs4_proc_create,
3269         .remove         = nfs4_proc_remove,
3270         .unlink_setup   = nfs4_proc_unlink_setup,
3271         .unlink_done    = nfs4_proc_unlink_done,
3272         .rename         = nfs4_proc_rename,
3273         .link           = nfs4_proc_link,
3274         .symlink        = nfs4_proc_symlink,
3275         .mkdir          = nfs4_proc_mkdir,
3276         .rmdir          = nfs4_proc_remove,
3277         .readdir        = nfs4_proc_readdir,
3278         .mknod          = nfs4_proc_mknod,
3279         .statfs         = nfs4_proc_statfs,
3280         .fsinfo         = nfs4_proc_fsinfo,
3281         .pathconf       = nfs4_proc_pathconf,
3282         .decode_dirent  = nfs4_decode_dirent,
3283         .read_setup     = nfs4_proc_read_setup,
3284         .write_setup    = nfs4_proc_write_setup,
3285         .commit_setup   = nfs4_proc_commit_setup,
3286         .file_open      = nfs_open,
3287         .file_release   = nfs_release,
3288         .lock           = nfs4_proc_lock,
3289         .clear_acl_cache = nfs4_zap_acl_attr,
3290 };
3291
3292 /*
3293  * Local variables:
3294  *  c-basic-offset: 8
3295  * End:
3296  */