locks: make ->lock release private data before returning in GETLK case
[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 #include "iostat.h"
55
56 #define NFSDBG_FACILITY         NFSDBG_PROC
57
58 #define NFS4_POLL_RETRY_MIN     (HZ/10)
59 #define NFS4_POLL_RETRY_MAX     (15*HZ)
60
61 struct nfs4_opendata;
62 static int _nfs4_proc_open(struct nfs4_opendata *data);
63 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
64 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *);
65 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry);
66 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception);
67 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp);
68
69 /* Prevent leaks of NFSv4 errors into userland */
70 int nfs4_map_errors(int err)
71 {
72         if (err < -1000) {
73                 dprintk("%s could not handle NFSv4 error %d\n",
74                                 __FUNCTION__, -err);
75                 return -EIO;
76         }
77         return err;
78 }
79
80 /*
81  * This is our standard bitmap for GETATTR requests.
82  */
83 const u32 nfs4_fattr_bitmap[2] = {
84         FATTR4_WORD0_TYPE
85         | FATTR4_WORD0_CHANGE
86         | FATTR4_WORD0_SIZE
87         | FATTR4_WORD0_FSID
88         | FATTR4_WORD0_FILEID,
89         FATTR4_WORD1_MODE
90         | FATTR4_WORD1_NUMLINKS
91         | FATTR4_WORD1_OWNER
92         | FATTR4_WORD1_OWNER_GROUP
93         | FATTR4_WORD1_RAWDEV
94         | FATTR4_WORD1_SPACE_USED
95         | FATTR4_WORD1_TIME_ACCESS
96         | FATTR4_WORD1_TIME_METADATA
97         | FATTR4_WORD1_TIME_MODIFY
98 };
99
100 const u32 nfs4_statfs_bitmap[2] = {
101         FATTR4_WORD0_FILES_AVAIL
102         | FATTR4_WORD0_FILES_FREE
103         | FATTR4_WORD0_FILES_TOTAL,
104         FATTR4_WORD1_SPACE_AVAIL
105         | FATTR4_WORD1_SPACE_FREE
106         | FATTR4_WORD1_SPACE_TOTAL
107 };
108
109 const u32 nfs4_pathconf_bitmap[2] = {
110         FATTR4_WORD0_MAXLINK
111         | FATTR4_WORD0_MAXNAME,
112         0
113 };
114
115 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
116                         | FATTR4_WORD0_MAXREAD
117                         | FATTR4_WORD0_MAXWRITE
118                         | FATTR4_WORD0_LEASE_TIME,
119                         0
120 };
121
122 const u32 nfs4_fs_locations_bitmap[2] = {
123         FATTR4_WORD0_TYPE
124         | FATTR4_WORD0_CHANGE
125         | FATTR4_WORD0_SIZE
126         | FATTR4_WORD0_FSID
127         | FATTR4_WORD0_FILEID
128         | FATTR4_WORD0_FS_LOCATIONS,
129         FATTR4_WORD1_MODE
130         | FATTR4_WORD1_NUMLINKS
131         | FATTR4_WORD1_OWNER
132         | FATTR4_WORD1_OWNER_GROUP
133         | FATTR4_WORD1_RAWDEV
134         | FATTR4_WORD1_SPACE_USED
135         | FATTR4_WORD1_TIME_ACCESS
136         | FATTR4_WORD1_TIME_METADATA
137         | FATTR4_WORD1_TIME_MODIFY
138         | FATTR4_WORD1_MOUNTED_ON_FILEID
139 };
140
141 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
142                 struct nfs4_readdir_arg *readdir)
143 {
144         __be32 *start, *p;
145
146         BUG_ON(readdir->count < 80);
147         if (cookie > 2) {
148                 readdir->cookie = cookie;
149                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
150                 return;
151         }
152
153         readdir->cookie = 0;
154         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
155         if (cookie == 2)
156                 return;
157         
158         /*
159          * NFSv4 servers do not return entries for '.' and '..'
160          * Therefore, we fake these entries here.  We let '.'
161          * have cookie 0 and '..' have cookie 1.  Note that
162          * when talking to the server, we always send cookie 0
163          * instead of 1 or 2.
164          */
165         start = p = kmap_atomic(*readdir->pages, KM_USER0);
166         
167         if (cookie == 0) {
168                 *p++ = xdr_one;                                  /* next */
169                 *p++ = xdr_zero;                   /* cookie, first word */
170                 *p++ = xdr_one;                   /* cookie, second word */
171                 *p++ = xdr_one;                             /* entry len */
172                 memcpy(p, ".\0\0\0", 4);                        /* entry */
173                 p++;
174                 *p++ = xdr_one;                         /* bitmap length */
175                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
176                 *p++ = htonl(8);              /* attribute buffer length */
177                 p = xdr_encode_hyper(p, dentry->d_inode->i_ino);
178         }
179         
180         *p++ = xdr_one;                                  /* next */
181         *p++ = xdr_zero;                   /* cookie, first word */
182         *p++ = xdr_two;                   /* cookie, second word */
183         *p++ = xdr_two;                             /* entry len */
184         memcpy(p, "..\0\0", 4);                         /* entry */
185         p++;
186         *p++ = xdr_one;                         /* bitmap length */
187         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
188         *p++ = htonl(8);              /* attribute buffer length */
189         p = xdr_encode_hyper(p, dentry->d_parent->d_inode->i_ino);
190
191         readdir->pgbase = (char *)p - (char *)start;
192         readdir->count -= readdir->pgbase;
193         kunmap_atomic(start, KM_USER0);
194 }
195
196 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
197 {
198         struct nfs_client *clp = server->nfs_client;
199         spin_lock(&clp->cl_lock);
200         if (time_before(clp->cl_last_renewal,timestamp))
201                 clp->cl_last_renewal = timestamp;
202         spin_unlock(&clp->cl_lock);
203 }
204
205 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
206 {
207         struct nfs_inode *nfsi = NFS_I(dir);
208
209         spin_lock(&dir->i_lock);
210         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
211         if (cinfo->before == nfsi->change_attr && cinfo->atomic)
212                 nfsi->change_attr = cinfo->after;
213         spin_unlock(&dir->i_lock);
214 }
215
216 struct nfs4_opendata {
217         atomic_t count;
218         struct nfs_openargs o_arg;
219         struct nfs_openres o_res;
220         struct nfs_open_confirmargs c_arg;
221         struct nfs_open_confirmres c_res;
222         struct nfs_fattr f_attr;
223         struct nfs_fattr dir_attr;
224         struct dentry *dentry;
225         struct dentry *dir;
226         struct nfs4_state_owner *owner;
227         struct iattr attrs;
228         unsigned long timestamp;
229         int rpc_status;
230         int cancelled;
231 };
232
233 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
234                 struct nfs4_state_owner *sp, int flags,
235                 const struct iattr *attrs)
236 {
237         struct dentry *parent = dget_parent(dentry);
238         struct inode *dir = parent->d_inode;
239         struct nfs_server *server = NFS_SERVER(dir);
240         struct nfs4_opendata *p;
241
242         p = kzalloc(sizeof(*p), GFP_KERNEL);
243         if (p == NULL)
244                 goto err;
245         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
246         if (p->o_arg.seqid == NULL)
247                 goto err_free;
248         atomic_set(&p->count, 1);
249         p->dentry = dget(dentry);
250         p->dir = parent;
251         p->owner = sp;
252         atomic_inc(&sp->so_count);
253         p->o_arg.fh = NFS_FH(dir);
254         p->o_arg.open_flags = flags,
255         p->o_arg.clientid = server->nfs_client->cl_clientid;
256         p->o_arg.id = sp->so_id;
257         p->o_arg.name = &dentry->d_name;
258         p->o_arg.server = server;
259         p->o_arg.bitmask = server->attr_bitmask;
260         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
261         p->o_res.f_attr = &p->f_attr;
262         p->o_res.dir_attr = &p->dir_attr;
263         p->o_res.server = server;
264         nfs_fattr_init(&p->f_attr);
265         nfs_fattr_init(&p->dir_attr);
266         if (flags & O_EXCL) {
267                 u32 *s = (u32 *) p->o_arg.u.verifier.data;
268                 s[0] = jiffies;
269                 s[1] = current->pid;
270         } else if (flags & O_CREAT) {
271                 p->o_arg.u.attrs = &p->attrs;
272                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
273         }
274         p->c_arg.fh = &p->o_res.fh;
275         p->c_arg.stateid = &p->o_res.stateid;
276         p->c_arg.seqid = p->o_arg.seqid;
277         return p;
278 err_free:
279         kfree(p);
280 err:
281         dput(parent);
282         return NULL;
283 }
284
285 static void nfs4_opendata_free(struct nfs4_opendata *p)
286 {
287         if (p != NULL && atomic_dec_and_test(&p->count)) {
288                 nfs_free_seqid(p->o_arg.seqid);
289                 nfs4_put_state_owner(p->owner);
290                 dput(p->dir);
291                 dput(p->dentry);
292                 kfree(p);
293         }
294 }
295
296 /* Helper for asynchronous RPC calls */
297 static int nfs4_call_async(struct rpc_clnt *clnt,
298                 const struct rpc_call_ops *tk_ops, void *calldata)
299 {
300         struct rpc_task *task;
301
302         if (!(task = rpc_new_task(clnt, RPC_TASK_ASYNC, tk_ops, calldata)))
303                 return -ENOMEM;
304         rpc_execute(task);
305         return 0;
306 }
307
308 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
309 {
310         sigset_t oldset;
311         int ret;
312
313         rpc_clnt_sigmask(task->tk_client, &oldset);
314         ret = rpc_wait_for_completion_task(task);
315         rpc_clnt_sigunmask(task->tk_client, &oldset);
316         return ret;
317 }
318
319 static inline void update_open_stateflags(struct nfs4_state *state, mode_t open_flags)
320 {
321         switch (open_flags) {
322                 case FMODE_WRITE:
323                         state->n_wronly++;
324                         break;
325                 case FMODE_READ:
326                         state->n_rdonly++;
327                         break;
328                 case FMODE_READ|FMODE_WRITE:
329                         state->n_rdwr++;
330         }
331 }
332
333 static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
334 {
335         struct inode *inode = state->inode;
336
337         open_flags &= (FMODE_READ|FMODE_WRITE);
338         /* Protect against nfs4_find_state_byowner() */
339         spin_lock(&state->owner->so_lock);
340         spin_lock(&inode->i_lock);
341         memcpy(&state->stateid, stateid, sizeof(state->stateid));
342         update_open_stateflags(state, open_flags);
343         nfs4_state_set_mode_locked(state, state->state | open_flags);
344         spin_unlock(&inode->i_lock);
345         spin_unlock(&state->owner->so_lock);
346 }
347
348 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
349 {
350         struct inode *inode;
351         struct nfs4_state *state = NULL;
352
353         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
354                 goto out;
355         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
356         if (IS_ERR(inode))
357                 goto out;
358         state = nfs4_get_open_state(inode, data->owner);
359         if (state == NULL)
360                 goto put_inode;
361         update_open_stateid(state, &data->o_res.stateid, data->o_arg.open_flags);
362 put_inode:
363         iput(inode);
364 out:
365         return state;
366 }
367
368 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
369 {
370         struct nfs_inode *nfsi = NFS_I(state->inode);
371         struct nfs_open_context *ctx;
372
373         spin_lock(&state->inode->i_lock);
374         list_for_each_entry(ctx, &nfsi->open_files, list) {
375                 if (ctx->state != state)
376                         continue;
377                 get_nfs_open_context(ctx);
378                 spin_unlock(&state->inode->i_lock);
379                 return ctx;
380         }
381         spin_unlock(&state->inode->i_lock);
382         return ERR_PTR(-ENOENT);
383 }
384
385 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, mode_t openflags, nfs4_stateid *stateid)
386 {
387         int ret;
388
389         opendata->o_arg.open_flags = openflags;
390         ret = _nfs4_proc_open(opendata);
391         if (ret != 0)
392                 return ret; 
393         memcpy(stateid->data, opendata->o_res.stateid.data,
394                         sizeof(stateid->data));
395         return 0;
396 }
397
398 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
399 {
400         nfs4_stateid stateid;
401         struct nfs4_state *newstate;
402         int mode = 0;
403         int delegation = 0;
404         int ret;
405
406         /* memory barrier prior to reading state->n_* */
407         smp_rmb();
408         if (state->n_rdwr != 0) {
409                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &stateid);
410                 if (ret != 0)
411                         return ret;
412                 mode |= FMODE_READ|FMODE_WRITE;
413                 if (opendata->o_res.delegation_type != 0)
414                         delegation = opendata->o_res.delegation_type;
415                 smp_rmb();
416         }
417         if (state->n_wronly != 0) {
418                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &stateid);
419                 if (ret != 0)
420                         return ret;
421                 mode |= FMODE_WRITE;
422                 if (opendata->o_res.delegation_type != 0)
423                         delegation = opendata->o_res.delegation_type;
424                 smp_rmb();
425         }
426         if (state->n_rdonly != 0) {
427                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &stateid);
428                 if (ret != 0)
429                         return ret;
430                 mode |= FMODE_READ;
431         }
432         clear_bit(NFS_DELEGATED_STATE, &state->flags);
433         if (mode == 0)
434                 return 0;
435         if (opendata->o_res.delegation_type == 0)
436                 opendata->o_res.delegation_type = delegation;
437         opendata->o_arg.open_flags |= mode;
438         newstate = nfs4_opendata_to_nfs4_state(opendata);
439         if (newstate != NULL) {
440                 if (opendata->o_res.delegation_type != 0) {
441                         struct nfs_inode *nfsi = NFS_I(newstate->inode);
442                         int delegation_flags = 0;
443                         if (nfsi->delegation)
444                                 delegation_flags = nfsi->delegation->flags;
445                         if (!(delegation_flags & NFS_DELEGATION_NEED_RECLAIM))
446                                 nfs_inode_set_delegation(newstate->inode,
447                                                 opendata->owner->so_cred,
448                                                 &opendata->o_res);
449                         else
450                                 nfs_inode_reclaim_delegation(newstate->inode,
451                                                 opendata->owner->so_cred,
452                                                 &opendata->o_res);
453                 }
454                 nfs4_close_state(newstate, opendata->o_arg.open_flags);
455         }
456         if (newstate != state)
457                 return -ESTALE;
458         return 0;
459 }
460
461 /*
462  * OPEN_RECLAIM:
463  *      reclaim state on the server after a reboot.
464  */
465 static int _nfs4_do_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
466 {
467         struct nfs_delegation *delegation = NFS_I(state->inode)->delegation;
468         struct nfs4_opendata *opendata;
469         int delegation_type = 0;
470         int status;
471
472         if (delegation != NULL) {
473                 if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
474                         memcpy(&state->stateid, &delegation->stateid,
475                                         sizeof(state->stateid));
476                         set_bit(NFS_DELEGATED_STATE, &state->flags);
477                         return 0;
478                 }
479                 delegation_type = delegation->type;
480         }
481         opendata = nfs4_opendata_alloc(dentry, sp, 0, NULL);
482         if (opendata == NULL)
483                 return -ENOMEM;
484         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
485         opendata->o_arg.fh = NFS_FH(state->inode);
486         nfs_copy_fh(&opendata->o_res.fh, opendata->o_arg.fh);
487         opendata->o_arg.u.delegation_type = delegation_type;
488         status = nfs4_open_recover(opendata, state);
489         nfs4_opendata_free(opendata);
490         return status;
491 }
492
493 static int nfs4_do_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
494 {
495         struct nfs_server *server = NFS_SERVER(state->inode);
496         struct nfs4_exception exception = { };
497         int err;
498         do {
499                 err = _nfs4_do_open_reclaim(sp, state, dentry);
500                 if (err != -NFS4ERR_DELAY)
501                         break;
502                 nfs4_handle_exception(server, err, &exception);
503         } while (exception.retry);
504         return err;
505 }
506
507 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
508 {
509         struct nfs_open_context *ctx;
510         int ret;
511
512         ctx = nfs4_state_find_open_context(state);
513         if (IS_ERR(ctx))
514                 return PTR_ERR(ctx);
515         ret = nfs4_do_open_reclaim(sp, state, ctx->dentry);
516         put_nfs_open_context(ctx);
517         return ret;
518 }
519
520 static int _nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
521 {
522         struct nfs4_state_owner  *sp  = state->owner;
523         struct nfs4_opendata *opendata;
524         int ret;
525
526         if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
527                 return 0;
528         opendata = nfs4_opendata_alloc(dentry, sp, 0, NULL);
529         if (opendata == NULL)
530                 return -ENOMEM;
531         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
532         memcpy(opendata->o_arg.u.delegation.data, state->stateid.data,
533                         sizeof(opendata->o_arg.u.delegation.data));
534         ret = nfs4_open_recover(opendata, state);
535         nfs4_opendata_free(opendata);
536         return ret;
537 }
538
539 int nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
540 {
541         struct nfs4_exception exception = { };
542         struct nfs_server *server = NFS_SERVER(dentry->d_inode);
543         int err;
544         do {
545                 err = _nfs4_open_delegation_recall(dentry, state);
546                 switch (err) {
547                         case 0:
548                                 return err;
549                         case -NFS4ERR_STALE_CLIENTID:
550                         case -NFS4ERR_STALE_STATEID:
551                         case -NFS4ERR_EXPIRED:
552                                 /* Don't recall a delegation if it was lost */
553                                 nfs4_schedule_state_recovery(server->nfs_client);
554                                 return err;
555                 }
556                 err = nfs4_handle_exception(server, err, &exception);
557         } while (exception.retry);
558         return err;
559 }
560
561 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
562 {
563         struct nfs4_opendata *data = calldata;
564         struct  rpc_message msg = {
565                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
566                 .rpc_argp = &data->c_arg,
567                 .rpc_resp = &data->c_res,
568                 .rpc_cred = data->owner->so_cred,
569         };
570         data->timestamp = jiffies;
571         rpc_call_setup(task, &msg, 0);
572 }
573
574 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
575 {
576         struct nfs4_opendata *data = calldata;
577
578         data->rpc_status = task->tk_status;
579         if (RPC_ASSASSINATED(task))
580                 return;
581         if (data->rpc_status == 0) {
582                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
583                                 sizeof(data->o_res.stateid.data));
584                 renew_lease(data->o_res.server, data->timestamp);
585         }
586         nfs_increment_open_seqid(data->rpc_status, data->c_arg.seqid);
587         nfs_confirm_seqid(&data->owner->so_seqid, data->rpc_status);
588 }
589
590 static void nfs4_open_confirm_release(void *calldata)
591 {
592         struct nfs4_opendata *data = calldata;
593         struct nfs4_state *state = NULL;
594
595         /* If this request hasn't been cancelled, do nothing */
596         if (data->cancelled == 0)
597                 goto out_free;
598         /* In case of error, no cleanup! */
599         if (data->rpc_status != 0)
600                 goto out_free;
601         nfs_confirm_seqid(&data->owner->so_seqid, 0);
602         state = nfs4_opendata_to_nfs4_state(data);
603         if (state != NULL)
604                 nfs4_close_state(state, data->o_arg.open_flags);
605 out_free:
606         nfs4_opendata_free(data);
607 }
608
609 static const struct rpc_call_ops nfs4_open_confirm_ops = {
610         .rpc_call_prepare = nfs4_open_confirm_prepare,
611         .rpc_call_done = nfs4_open_confirm_done,
612         .rpc_release = nfs4_open_confirm_release,
613 };
614
615 /*
616  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
617  */
618 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
619 {
620         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
621         struct rpc_task *task;
622         int status;
623
624         atomic_inc(&data->count);
625         /*
626          * If rpc_run_task() ends up calling ->rpc_release(), we
627          * want to ensure that it takes the 'error' code path.
628          */
629         data->rpc_status = -ENOMEM;
630         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_confirm_ops, data);
631         if (IS_ERR(task))
632                 return PTR_ERR(task);
633         status = nfs4_wait_for_completion_rpc_task(task);
634         if (status != 0) {
635                 data->cancelled = 1;
636                 smp_wmb();
637         } else
638                 status = data->rpc_status;
639         rpc_put_task(task);
640         return status;
641 }
642
643 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
644 {
645         struct nfs4_opendata *data = calldata;
646         struct nfs4_state_owner *sp = data->owner;
647         struct rpc_message msg = {
648                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
649                 .rpc_argp = &data->o_arg,
650                 .rpc_resp = &data->o_res,
651                 .rpc_cred = sp->so_cred,
652         };
653         
654         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
655                 return;
656         /* Update sequence id. */
657         data->o_arg.id = sp->so_id;
658         data->o_arg.clientid = sp->so_client->cl_clientid;
659         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
660                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
661         data->timestamp = jiffies;
662         rpc_call_setup(task, &msg, 0);
663 }
664
665 static void nfs4_open_done(struct rpc_task *task, void *calldata)
666 {
667         struct nfs4_opendata *data = calldata;
668
669         data->rpc_status = task->tk_status;
670         if (RPC_ASSASSINATED(task))
671                 return;
672         if (task->tk_status == 0) {
673                 switch (data->o_res.f_attr->mode & S_IFMT) {
674                         case S_IFREG:
675                                 break;
676                         case S_IFLNK:
677                                 data->rpc_status = -ELOOP;
678                                 break;
679                         case S_IFDIR:
680                                 data->rpc_status = -EISDIR;
681                                 break;
682                         default:
683                                 data->rpc_status = -ENOTDIR;
684                 }
685                 renew_lease(data->o_res.server, data->timestamp);
686         }
687         nfs_increment_open_seqid(data->rpc_status, data->o_arg.seqid);
688 }
689
690 static void nfs4_open_release(void *calldata)
691 {
692         struct nfs4_opendata *data = calldata;
693         struct nfs4_state *state = NULL;
694
695         /* If this request hasn't been cancelled, do nothing */
696         if (data->cancelled == 0)
697                 goto out_free;
698         /* In case of error, no cleanup! */
699         if (data->rpc_status != 0)
700                 goto out_free;
701         /* In case we need an open_confirm, no cleanup! */
702         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
703                 goto out_free;
704         nfs_confirm_seqid(&data->owner->so_seqid, 0);
705         state = nfs4_opendata_to_nfs4_state(data);
706         if (state != NULL)
707                 nfs4_close_state(state, data->o_arg.open_flags);
708 out_free:
709         nfs4_opendata_free(data);
710 }
711
712 static const struct rpc_call_ops nfs4_open_ops = {
713         .rpc_call_prepare = nfs4_open_prepare,
714         .rpc_call_done = nfs4_open_done,
715         .rpc_release = nfs4_open_release,
716 };
717
718 /*
719  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
720  */
721 static int _nfs4_proc_open(struct nfs4_opendata *data)
722 {
723         struct inode *dir = data->dir->d_inode;
724         struct nfs_server *server = NFS_SERVER(dir);
725         struct nfs_openargs *o_arg = &data->o_arg;
726         struct nfs_openres *o_res = &data->o_res;
727         struct rpc_task *task;
728         int status;
729
730         atomic_inc(&data->count);
731         /*
732          * If rpc_run_task() ends up calling ->rpc_release(), we
733          * want to ensure that it takes the 'error' code path.
734          */
735         data->rpc_status = -ENOMEM;
736         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_ops, data);
737         if (IS_ERR(task))
738                 return PTR_ERR(task);
739         status = nfs4_wait_for_completion_rpc_task(task);
740         if (status != 0) {
741                 data->cancelled = 1;
742                 smp_wmb();
743         } else
744                 status = data->rpc_status;
745         rpc_put_task(task);
746         if (status != 0)
747                 return status;
748
749         if (o_arg->open_flags & O_CREAT) {
750                 update_changeattr(dir, &o_res->cinfo);
751                 nfs_post_op_update_inode(dir, o_res->dir_attr);
752         } else
753                 nfs_refresh_inode(dir, o_res->dir_attr);
754         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
755                 status = _nfs4_proc_open_confirm(data);
756                 if (status != 0)
757                         return status;
758         }
759         nfs_confirm_seqid(&data->owner->so_seqid, 0);
760         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
761                 return server->nfs_client->rpc_ops->getattr(server, &o_res->fh, o_res->f_attr);
762         return 0;
763 }
764
765 static int _nfs4_do_access(struct inode *inode, struct rpc_cred *cred, int openflags)
766 {
767         struct nfs_access_entry cache;
768         int mask = 0;
769         int status;
770
771         if (openflags & FMODE_READ)
772                 mask |= MAY_READ;
773         if (openflags & FMODE_WRITE)
774                 mask |= MAY_WRITE;
775         status = nfs_access_get_cached(inode, cred, &cache);
776         if (status == 0)
777                 goto out;
778
779         /* Be clever: ask server to check for all possible rights */
780         cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ;
781         cache.cred = cred;
782         cache.jiffies = jiffies;
783         status = _nfs4_proc_access(inode, &cache);
784         if (status != 0)
785                 return status;
786         nfs_access_add_cache(inode, &cache);
787 out:
788         if ((cache.mask & mask) == mask)
789                 return 0;
790         return -EACCES;
791 }
792
793 int nfs4_recover_expired_lease(struct nfs_server *server)
794 {
795         struct nfs_client *clp = server->nfs_client;
796         int ret;
797
798         for (;;) {
799                 ret = nfs4_wait_clnt_recover(server->client, clp);
800                 if (ret != 0)
801                         return ret;
802                 if (!test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
803                         break;
804                 nfs4_schedule_state_recovery(clp);
805         }
806         return 0;
807 }
808
809 /*
810  * OPEN_EXPIRED:
811  *      reclaim state on the server after a network partition.
812  *      Assumes caller holds the appropriate lock
813  */
814 static int _nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
815 {
816         struct inode *inode = state->inode;
817         struct nfs_delegation *delegation = NFS_I(inode)->delegation;
818         struct nfs4_opendata *opendata;
819         int openflags = state->state & (FMODE_READ|FMODE_WRITE);
820         int ret;
821
822         if (delegation != NULL && !(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
823                 ret = _nfs4_do_access(inode, sp->so_cred, openflags);
824                 if (ret < 0)
825                         return ret;
826                 memcpy(&state->stateid, &delegation->stateid, sizeof(state->stateid));
827                 set_bit(NFS_DELEGATED_STATE, &state->flags);
828                 return 0;
829         }
830         opendata = nfs4_opendata_alloc(dentry, sp, openflags, NULL);
831         if (opendata == NULL)
832                 return -ENOMEM;
833         ret = nfs4_open_recover(opendata, state);
834         if (ret == -ESTALE) {
835                 /* Invalidate the state owner so we don't ever use it again */
836                 nfs4_drop_state_owner(sp);
837                 d_drop(dentry);
838         }
839         nfs4_opendata_free(opendata);
840         return ret;
841 }
842
843 static inline int nfs4_do_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
844 {
845         struct nfs_server *server = NFS_SERVER(dentry->d_inode);
846         struct nfs4_exception exception = { };
847         int err;
848
849         do {
850                 err = _nfs4_open_expired(sp, state, dentry);
851                 if (err == -NFS4ERR_DELAY)
852                         nfs4_handle_exception(server, err, &exception);
853         } while (exception.retry);
854         return err;
855 }
856
857 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
858 {
859         struct nfs_open_context *ctx;
860         int ret;
861
862         ctx = nfs4_state_find_open_context(state);
863         if (IS_ERR(ctx))
864                 return PTR_ERR(ctx);
865         ret = nfs4_do_open_expired(sp, state, ctx->dentry);
866         put_nfs_open_context(ctx);
867         return ret;
868 }
869
870 /*
871  * Returns a referenced nfs4_state if there is an open delegation on the file
872  */
873 static int _nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred, struct nfs4_state **res)
874 {
875         struct nfs_delegation *delegation;
876         struct nfs_server *server = NFS_SERVER(inode);
877         struct nfs_client *clp = server->nfs_client;
878         struct nfs_inode *nfsi = NFS_I(inode);
879         struct nfs4_state_owner *sp = NULL;
880         struct nfs4_state *state = NULL;
881         int open_flags = flags & (FMODE_READ|FMODE_WRITE);
882         int err;
883
884         err = -ENOMEM;
885         if (!(sp = nfs4_get_state_owner(server, cred))) {
886                 dprintk("%s: nfs4_get_state_owner failed!\n", __FUNCTION__);
887                 return err;
888         }
889         err = nfs4_recover_expired_lease(server);
890         if (err != 0)
891                 goto out_put_state_owner;
892         /* Protect against reboot recovery - NOTE ORDER! */
893         down_read(&clp->cl_sem);
894         /* Protect against delegation recall */
895         down_read(&nfsi->rwsem);
896         delegation = NFS_I(inode)->delegation;
897         err = -ENOENT;
898         if (delegation == NULL || (delegation->type & open_flags) != open_flags)
899                 goto out_err;
900         err = -ENOMEM;
901         state = nfs4_get_open_state(inode, sp);
902         if (state == NULL)
903                 goto out_err;
904
905         err = -ENOENT;
906         if ((state->state & open_flags) == open_flags) {
907                 spin_lock(&inode->i_lock);
908                 update_open_stateflags(state, open_flags);
909                 spin_unlock(&inode->i_lock);
910                 goto out_ok;
911         } else if (state->state != 0)
912                 goto out_put_open_state;
913
914         lock_kernel();
915         err = _nfs4_do_access(inode, cred, open_flags);
916         unlock_kernel();
917         if (err != 0)
918                 goto out_put_open_state;
919         set_bit(NFS_DELEGATED_STATE, &state->flags);
920         update_open_stateid(state, &delegation->stateid, open_flags);
921 out_ok:
922         nfs4_put_state_owner(sp);
923         up_read(&nfsi->rwsem);
924         up_read(&clp->cl_sem);
925         *res = state;
926         return 0;
927 out_put_open_state:
928         nfs4_put_open_state(state);
929 out_err:
930         up_read(&nfsi->rwsem);
931         up_read(&clp->cl_sem);
932         if (err != -EACCES)
933                 nfs_inode_return_delegation(inode);
934 out_put_state_owner:
935         nfs4_put_state_owner(sp);
936         return err;
937 }
938
939 static struct nfs4_state *nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred)
940 {
941         struct nfs4_exception exception = { };
942         struct nfs4_state *res = ERR_PTR(-EIO);
943         int err;
944
945         do {
946                 err = _nfs4_open_delegated(inode, flags, cred, &res);
947                 if (err == 0)
948                         break;
949                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(inode),
950                                         err, &exception));
951         } while (exception.retry);
952         return res;
953 }
954
955 /*
956  * Returns a referenced nfs4_state
957  */
958 static int _nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
959 {
960         struct nfs4_state_owner  *sp;
961         struct nfs4_state     *state = NULL;
962         struct nfs_server       *server = NFS_SERVER(dir);
963         struct nfs_client *clp = server->nfs_client;
964         struct nfs4_opendata *opendata;
965         int                     status;
966
967         /* Protect against reboot recovery conflicts */
968         status = -ENOMEM;
969         if (!(sp = nfs4_get_state_owner(server, cred))) {
970                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
971                 goto out_err;
972         }
973         status = nfs4_recover_expired_lease(server);
974         if (status != 0)
975                 goto err_put_state_owner;
976         down_read(&clp->cl_sem);
977         status = -ENOMEM;
978         opendata = nfs4_opendata_alloc(dentry, sp, flags, sattr);
979         if (opendata == NULL)
980                 goto err_release_rwsem;
981
982         status = _nfs4_proc_open(opendata);
983         if (status != 0)
984                 goto err_opendata_free;
985
986         status = -ENOMEM;
987         state = nfs4_opendata_to_nfs4_state(opendata);
988         if (state == NULL)
989                 goto err_opendata_free;
990         if (opendata->o_res.delegation_type != 0)
991                 nfs_inode_set_delegation(state->inode, cred, &opendata->o_res);
992         nfs4_opendata_free(opendata);
993         nfs4_put_state_owner(sp);
994         up_read(&clp->cl_sem);
995         *res = state;
996         return 0;
997 err_opendata_free:
998         nfs4_opendata_free(opendata);
999 err_release_rwsem:
1000         up_read(&clp->cl_sem);
1001 err_put_state_owner:
1002         nfs4_put_state_owner(sp);
1003 out_err:
1004         *res = NULL;
1005         return status;
1006 }
1007
1008
1009 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred)
1010 {
1011         struct nfs4_exception exception = { };
1012         struct nfs4_state *res;
1013         int status;
1014
1015         do {
1016                 status = _nfs4_do_open(dir, dentry, flags, sattr, cred, &res);
1017                 if (status == 0)
1018                         break;
1019                 /* NOTE: BAD_SEQID means the server and client disagree about the
1020                  * book-keeping w.r.t. state-changing operations
1021                  * (OPEN/CLOSE/LOCK/LOCKU...)
1022                  * It is actually a sign of a bug on the client or on the server.
1023                  *
1024                  * If we receive a BAD_SEQID error in the particular case of
1025                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1026                  * have unhashed the old state_owner for us, and that we can
1027                  * therefore safely retry using a new one. We should still warn
1028                  * the user though...
1029                  */
1030                 if (status == -NFS4ERR_BAD_SEQID) {
1031                         printk(KERN_WARNING "NFS: v4 server returned a bad sequence-id error!\n");
1032                         exception.retry = 1;
1033                         continue;
1034                 }
1035                 /*
1036                  * BAD_STATEID on OPEN means that the server cancelled our
1037                  * state before it received the OPEN_CONFIRM.
1038                  * Recover by retrying the request as per the discussion
1039                  * on Page 181 of RFC3530.
1040                  */
1041                 if (status == -NFS4ERR_BAD_STATEID) {
1042                         exception.retry = 1;
1043                         continue;
1044                 }
1045                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1046                                         status, &exception));
1047         } while (exception.retry);
1048         return res;
1049 }
1050
1051 static int _nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1052                 struct iattr *sattr, struct nfs4_state *state)
1053 {
1054         struct nfs_server *server = NFS_SERVER(inode);
1055         struct nfs_setattrargs  arg = {
1056                 .fh             = NFS_FH(inode),
1057                 .iap            = sattr,
1058                 .server         = server,
1059                 .bitmask = server->attr_bitmask,
1060         };
1061         struct nfs_setattrres  res = {
1062                 .fattr          = fattr,
1063                 .server         = server,
1064         };
1065         struct rpc_message msg = {
1066                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1067                 .rpc_argp       = &arg,
1068                 .rpc_resp       = &res,
1069         };
1070         unsigned long timestamp = jiffies;
1071         int status;
1072
1073         nfs_fattr_init(fattr);
1074
1075         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1076                 /* Use that stateid */
1077         } else if (state != NULL) {
1078                 msg.rpc_cred = state->owner->so_cred;
1079                 nfs4_copy_stateid(&arg.stateid, state, current->files);
1080         } else
1081                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1082
1083         status = rpc_call_sync(server->client, &msg, 0);
1084         if (status == 0 && state != NULL)
1085                 renew_lease(server, timestamp);
1086         return status;
1087 }
1088
1089 static int nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1090                 struct iattr *sattr, struct nfs4_state *state)
1091 {
1092         struct nfs_server *server = NFS_SERVER(inode);
1093         struct nfs4_exception exception = { };
1094         int err;
1095         do {
1096                 err = nfs4_handle_exception(server,
1097                                 _nfs4_do_setattr(inode, fattr, sattr, state),
1098                                 &exception);
1099         } while (exception.retry);
1100         return err;
1101 }
1102
1103 struct nfs4_closedata {
1104         struct inode *inode;
1105         struct nfs4_state *state;
1106         struct nfs_closeargs arg;
1107         struct nfs_closeres res;
1108         struct nfs_fattr fattr;
1109         unsigned long timestamp;
1110 };
1111
1112 static void nfs4_free_closedata(void *data)
1113 {
1114         struct nfs4_closedata *calldata = data;
1115         struct nfs4_state_owner *sp = calldata->state->owner;
1116
1117         nfs4_put_open_state(calldata->state);
1118         nfs_free_seqid(calldata->arg.seqid);
1119         nfs4_put_state_owner(sp);
1120         kfree(calldata);
1121 }
1122
1123 static void nfs4_close_done(struct rpc_task *task, void *data)
1124 {
1125         struct nfs4_closedata *calldata = data;
1126         struct nfs4_state *state = calldata->state;
1127         struct nfs_server *server = NFS_SERVER(calldata->inode);
1128
1129         if (RPC_ASSASSINATED(task))
1130                 return;
1131         /* hmm. we are done with the inode, and in the process of freeing
1132          * the state_owner. we keep this around to process errors
1133          */
1134         nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid);
1135         switch (task->tk_status) {
1136                 case 0:
1137                         memcpy(&state->stateid, &calldata->res.stateid,
1138                                         sizeof(state->stateid));
1139                         renew_lease(server, calldata->timestamp);
1140                         break;
1141                 case -NFS4ERR_STALE_STATEID:
1142                 case -NFS4ERR_EXPIRED:
1143                         break;
1144                 default:
1145                         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1146                                 rpc_restart_call(task);
1147                                 return;
1148                         }
1149         }
1150         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1151 }
1152
1153 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1154 {
1155         struct nfs4_closedata *calldata = data;
1156         struct nfs4_state *state = calldata->state;
1157         struct rpc_message msg = {
1158                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1159                 .rpc_argp = &calldata->arg,
1160                 .rpc_resp = &calldata->res,
1161                 .rpc_cred = state->owner->so_cred,
1162         };
1163         int mode = 0, old_mode;
1164
1165         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1166                 return;
1167         /* Recalculate the new open mode in case someone reopened the file
1168          * while we were waiting in line to be scheduled.
1169          */
1170         spin_lock(&state->owner->so_lock);
1171         spin_lock(&calldata->inode->i_lock);
1172         mode = old_mode = state->state;
1173         if (state->n_rdwr == 0) {
1174                 if (state->n_rdonly == 0)
1175                         mode &= ~FMODE_READ;
1176                 if (state->n_wronly == 0)
1177                         mode &= ~FMODE_WRITE;
1178         }
1179         nfs4_state_set_mode_locked(state, mode);
1180         spin_unlock(&calldata->inode->i_lock);
1181         spin_unlock(&state->owner->so_lock);
1182         if (mode == old_mode || test_bit(NFS_DELEGATED_STATE, &state->flags)) {
1183                 /* Note: exit _without_ calling nfs4_close_done */
1184                 task->tk_action = NULL;
1185                 return;
1186         }
1187         nfs_fattr_init(calldata->res.fattr);
1188         if (mode != 0)
1189                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1190         calldata->arg.open_flags = mode;
1191         calldata->timestamp = jiffies;
1192         rpc_call_setup(task, &msg, 0);
1193 }
1194
1195 static const struct rpc_call_ops nfs4_close_ops = {
1196         .rpc_call_prepare = nfs4_close_prepare,
1197         .rpc_call_done = nfs4_close_done,
1198         .rpc_release = nfs4_free_closedata,
1199 };
1200
1201 /* 
1202  * It is possible for data to be read/written from a mem-mapped file 
1203  * after the sys_close call (which hits the vfs layer as a flush).
1204  * This means that we can't safely call nfsv4 close on a file until 
1205  * the inode is cleared. This in turn means that we are not good
1206  * NFSv4 citizens - we do not indicate to the server to update the file's 
1207  * share state even when we are done with one of the three share 
1208  * stateid's in the inode.
1209  *
1210  * NOTE: Caller must be holding the sp->so_owner semaphore!
1211  */
1212 int nfs4_do_close(struct inode *inode, struct nfs4_state *state) 
1213 {
1214         struct nfs_server *server = NFS_SERVER(inode);
1215         struct nfs4_closedata *calldata;
1216         int status = -ENOMEM;
1217
1218         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1219         if (calldata == NULL)
1220                 goto out;
1221         calldata->inode = inode;
1222         calldata->state = state;
1223         calldata->arg.fh = NFS_FH(inode);
1224         calldata->arg.stateid = &state->stateid;
1225         /* Serialization for the sequence id */
1226         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1227         if (calldata->arg.seqid == NULL)
1228                 goto out_free_calldata;
1229         calldata->arg.bitmask = server->attr_bitmask;
1230         calldata->res.fattr = &calldata->fattr;
1231         calldata->res.server = server;
1232
1233         status = nfs4_call_async(server->client, &nfs4_close_ops, calldata);
1234         if (status == 0)
1235                 goto out;
1236
1237         nfs_free_seqid(calldata->arg.seqid);
1238 out_free_calldata:
1239         kfree(calldata);
1240 out:
1241         return status;
1242 }
1243
1244 static int nfs4_intent_set_file(struct nameidata *nd, struct dentry *dentry, struct nfs4_state *state)
1245 {
1246         struct file *filp;
1247
1248         filp = lookup_instantiate_filp(nd, dentry, NULL);
1249         if (!IS_ERR(filp)) {
1250                 struct nfs_open_context *ctx;
1251                 ctx = (struct nfs_open_context *)filp->private_data;
1252                 ctx->state = state;
1253                 return 0;
1254         }
1255         nfs4_close_state(state, nd->intent.open.flags);
1256         return PTR_ERR(filp);
1257 }
1258
1259 struct dentry *
1260 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1261 {
1262         struct iattr attr;
1263         struct rpc_cred *cred;
1264         struct nfs4_state *state;
1265         struct dentry *res;
1266
1267         if (nd->flags & LOOKUP_CREATE) {
1268                 attr.ia_mode = nd->intent.open.create_mode;
1269                 attr.ia_valid = ATTR_MODE;
1270                 if (!IS_POSIXACL(dir))
1271                         attr.ia_mode &= ~current->fs->umask;
1272         } else {
1273                 attr.ia_valid = 0;
1274                 BUG_ON(nd->intent.open.flags & O_CREAT);
1275         }
1276
1277         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1278         if (IS_ERR(cred))
1279                 return (struct dentry *)cred;
1280         state = nfs4_do_open(dir, dentry, nd->intent.open.flags, &attr, cred);
1281         put_rpccred(cred);
1282         if (IS_ERR(state)) {
1283                 if (PTR_ERR(state) == -ENOENT)
1284                         d_add(dentry, NULL);
1285                 return (struct dentry *)state;
1286         }
1287         res = d_add_unique(dentry, igrab(state->inode));
1288         if (res != NULL)
1289                 dentry = res;
1290         nfs4_intent_set_file(nd, dentry, state);
1291         return res;
1292 }
1293
1294 int
1295 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1296 {
1297         struct rpc_cred *cred;
1298         struct nfs4_state *state;
1299
1300         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1301         if (IS_ERR(cred))
1302                 return PTR_ERR(cred);
1303         state = nfs4_open_delegated(dentry->d_inode, openflags, cred);
1304         if (IS_ERR(state))
1305                 state = nfs4_do_open(dir, dentry, openflags, NULL, cred);
1306         put_rpccred(cred);
1307         if (IS_ERR(state)) {
1308                 switch (PTR_ERR(state)) {
1309                         case -EPERM:
1310                         case -EACCES:
1311                         case -EDQUOT:
1312                         case -ENOSPC:
1313                         case -EROFS:
1314                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1315                                 return 1;
1316                         default:
1317                                 goto out_drop;
1318                 }
1319         }
1320         if (state->inode == dentry->d_inode) {
1321                 nfs4_intent_set_file(nd, dentry, state);
1322                 return 1;
1323         }
1324         nfs4_close_state(state, openflags);
1325 out_drop:
1326         d_drop(dentry);
1327         return 0;
1328 }
1329
1330
1331 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1332 {
1333         struct nfs4_server_caps_res res = {};
1334         struct rpc_message msg = {
1335                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1336                 .rpc_argp = fhandle,
1337                 .rpc_resp = &res,
1338         };
1339         int status;
1340
1341         status = rpc_call_sync(server->client, &msg, 0);
1342         if (status == 0) {
1343                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1344                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1345                         server->caps |= NFS_CAP_ACLS;
1346                 if (res.has_links != 0)
1347                         server->caps |= NFS_CAP_HARDLINKS;
1348                 if (res.has_symlinks != 0)
1349                         server->caps |= NFS_CAP_SYMLINKS;
1350                 server->acl_bitmask = res.acl_bitmask;
1351         }
1352         return status;
1353 }
1354
1355 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1356 {
1357         struct nfs4_exception exception = { };
1358         int err;
1359         do {
1360                 err = nfs4_handle_exception(server,
1361                                 _nfs4_server_capabilities(server, fhandle),
1362                                 &exception);
1363         } while (exception.retry);
1364         return err;
1365 }
1366
1367 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1368                 struct nfs_fsinfo *info)
1369 {
1370         struct nfs4_lookup_root_arg args = {
1371                 .bitmask = nfs4_fattr_bitmap,
1372         };
1373         struct nfs4_lookup_res res = {
1374                 .server = server,
1375                 .fattr = info->fattr,
1376                 .fh = fhandle,
1377         };
1378         struct rpc_message msg = {
1379                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1380                 .rpc_argp = &args,
1381                 .rpc_resp = &res,
1382         };
1383         nfs_fattr_init(info->fattr);
1384         return rpc_call_sync(server->client, &msg, 0);
1385 }
1386
1387 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1388                 struct nfs_fsinfo *info)
1389 {
1390         struct nfs4_exception exception = { };
1391         int err;
1392         do {
1393                 err = nfs4_handle_exception(server,
1394                                 _nfs4_lookup_root(server, fhandle, info),
1395                                 &exception);
1396         } while (exception.retry);
1397         return err;
1398 }
1399
1400 /*
1401  * get the file handle for the "/" directory on the server
1402  */
1403 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1404                               struct nfs_fsinfo *info)
1405 {
1406         int status;
1407
1408         status = nfs4_lookup_root(server, fhandle, info);
1409         if (status == 0)
1410                 status = nfs4_server_capabilities(server, fhandle);
1411         if (status == 0)
1412                 status = nfs4_do_fsinfo(server, fhandle, info);
1413         return nfs4_map_errors(status);
1414 }
1415
1416 /*
1417  * Get locations and (maybe) other attributes of a referral.
1418  * Note that we'll actually follow the referral later when
1419  * we detect fsid mismatch in inode revalidation
1420  */
1421 static int nfs4_get_referral(struct inode *dir, struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
1422 {
1423         int status = -ENOMEM;
1424         struct page *page = NULL;
1425         struct nfs4_fs_locations *locations = NULL;
1426
1427         page = alloc_page(GFP_KERNEL);
1428         if (page == NULL)
1429                 goto out;
1430         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1431         if (locations == NULL)
1432                 goto out;
1433
1434         status = nfs4_proc_fs_locations(dir, name, locations, page);
1435         if (status != 0)
1436                 goto out;
1437         /* Make sure server returned a different fsid for the referral */
1438         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
1439                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __FUNCTION__, name->name);
1440                 status = -EIO;
1441                 goto out;
1442         }
1443
1444         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
1445         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
1446         if (!fattr->mode)
1447                 fattr->mode = S_IFDIR;
1448         memset(fhandle, 0, sizeof(struct nfs_fh));
1449 out:
1450         if (page)
1451                 __free_page(page);
1452         if (locations)
1453                 kfree(locations);
1454         return status;
1455 }
1456
1457 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1458 {
1459         struct nfs4_getattr_arg args = {
1460                 .fh = fhandle,
1461                 .bitmask = server->attr_bitmask,
1462         };
1463         struct nfs4_getattr_res res = {
1464                 .fattr = fattr,
1465                 .server = server,
1466         };
1467         struct rpc_message msg = {
1468                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1469                 .rpc_argp = &args,
1470                 .rpc_resp = &res,
1471         };
1472         
1473         nfs_fattr_init(fattr);
1474         return rpc_call_sync(server->client, &msg, 0);
1475 }
1476
1477 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1478 {
1479         struct nfs4_exception exception = { };
1480         int err;
1481         do {
1482                 err = nfs4_handle_exception(server,
1483                                 _nfs4_proc_getattr(server, fhandle, fattr),
1484                                 &exception);
1485         } while (exception.retry);
1486         return err;
1487 }
1488
1489 /* 
1490  * The file is not closed if it is opened due to the a request to change
1491  * the size of the file. The open call will not be needed once the
1492  * VFS layer lookup-intents are implemented.
1493  *
1494  * Close is called when the inode is destroyed.
1495  * If we haven't opened the file for O_WRONLY, we
1496  * need to in the size_change case to obtain a stateid.
1497  *
1498  * Got race?
1499  * Because OPEN is always done by name in nfsv4, it is
1500  * possible that we opened a different file by the same
1501  * name.  We can recognize this race condition, but we
1502  * can't do anything about it besides returning an error.
1503  *
1504  * This will be fixed with VFS changes (lookup-intent).
1505  */
1506 static int
1507 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1508                   struct iattr *sattr)
1509 {
1510         struct rpc_cred *cred;
1511         struct inode *inode = dentry->d_inode;
1512         struct nfs_open_context *ctx;
1513         struct nfs4_state *state = NULL;
1514         int status;
1515
1516         nfs_fattr_init(fattr);
1517         
1518         cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
1519         if (IS_ERR(cred))
1520                 return PTR_ERR(cred);
1521
1522         /* Search for an existing open(O_WRITE) file */
1523         ctx = nfs_find_open_context(inode, cred, FMODE_WRITE);
1524         if (ctx != NULL)
1525                 state = ctx->state;
1526
1527         status = nfs4_do_setattr(inode, fattr, sattr, state);
1528         if (status == 0)
1529                 nfs_setattr_update_inode(inode, sattr);
1530         if (ctx != NULL)
1531                 put_nfs_open_context(ctx);
1532         put_rpccred(cred);
1533         return status;
1534 }
1535
1536 static int _nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1537                 struct qstr *name, struct nfs_fh *fhandle,
1538                 struct nfs_fattr *fattr)
1539 {
1540         int                    status;
1541         struct nfs4_lookup_arg args = {
1542                 .bitmask = server->attr_bitmask,
1543                 .dir_fh = dirfh,
1544                 .name = name,
1545         };
1546         struct nfs4_lookup_res res = {
1547                 .server = server,
1548                 .fattr = fattr,
1549                 .fh = fhandle,
1550         };
1551         struct rpc_message msg = {
1552                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1553                 .rpc_argp = &args,
1554                 .rpc_resp = &res,
1555         };
1556
1557         nfs_fattr_init(fattr);
1558
1559         dprintk("NFS call  lookupfh %s\n", name->name);
1560         status = rpc_call_sync(server->client, &msg, 0);
1561         dprintk("NFS reply lookupfh: %d\n", status);
1562         if (status == -NFS4ERR_MOVED)
1563                 status = -EREMOTE;
1564         return status;
1565 }
1566
1567 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1568                               struct qstr *name, struct nfs_fh *fhandle,
1569                               struct nfs_fattr *fattr)
1570 {
1571         struct nfs4_exception exception = { };
1572         int err;
1573         do {
1574                 err = nfs4_handle_exception(server,
1575                                 _nfs4_proc_lookupfh(server, dirfh, name,
1576                                                     fhandle, fattr),
1577                                 &exception);
1578         } while (exception.retry);
1579         return err;
1580 }
1581
1582 static int _nfs4_proc_lookup(struct inode *dir, struct qstr *name,
1583                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1584 {
1585         int                    status;
1586         struct nfs_server *server = NFS_SERVER(dir);
1587         struct nfs4_lookup_arg args = {
1588                 .bitmask = server->attr_bitmask,
1589                 .dir_fh = NFS_FH(dir),
1590                 .name = name,
1591         };
1592         struct nfs4_lookup_res res = {
1593                 .server = server,
1594                 .fattr = fattr,
1595                 .fh = fhandle,
1596         };
1597         struct rpc_message msg = {
1598                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1599                 .rpc_argp = &args,
1600                 .rpc_resp = &res,
1601         };
1602         
1603         nfs_fattr_init(fattr);
1604         
1605         dprintk("NFS call  lookup %s\n", name->name);
1606         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1607         if (status == -NFS4ERR_MOVED)
1608                 status = nfs4_get_referral(dir, name, fattr, fhandle);
1609         dprintk("NFS reply lookup: %d\n", status);
1610         return status;
1611 }
1612
1613 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1614 {
1615         struct nfs4_exception exception = { };
1616         int err;
1617         do {
1618                 err = nfs4_handle_exception(NFS_SERVER(dir),
1619                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1620                                 &exception);
1621         } while (exception.retry);
1622         return err;
1623 }
1624
1625 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1626 {
1627         struct nfs4_accessargs args = {
1628                 .fh = NFS_FH(inode),
1629         };
1630         struct nfs4_accessres res = { 0 };
1631         struct rpc_message msg = {
1632                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1633                 .rpc_argp = &args,
1634                 .rpc_resp = &res,
1635                 .rpc_cred = entry->cred,
1636         };
1637         int mode = entry->mask;
1638         int status;
1639
1640         /*
1641          * Determine which access bits we want to ask for...
1642          */
1643         if (mode & MAY_READ)
1644                 args.access |= NFS4_ACCESS_READ;
1645         if (S_ISDIR(inode->i_mode)) {
1646                 if (mode & MAY_WRITE)
1647                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1648                 if (mode & MAY_EXEC)
1649                         args.access |= NFS4_ACCESS_LOOKUP;
1650         } else {
1651                 if (mode & MAY_WRITE)
1652                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1653                 if (mode & MAY_EXEC)
1654                         args.access |= NFS4_ACCESS_EXECUTE;
1655         }
1656         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1657         if (!status) {
1658                 entry->mask = 0;
1659                 if (res.access & NFS4_ACCESS_READ)
1660                         entry->mask |= MAY_READ;
1661                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1662                         entry->mask |= MAY_WRITE;
1663                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1664                         entry->mask |= MAY_EXEC;
1665         }
1666         return status;
1667 }
1668
1669 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1670 {
1671         struct nfs4_exception exception = { };
1672         int err;
1673         do {
1674                 err = nfs4_handle_exception(NFS_SERVER(inode),
1675                                 _nfs4_proc_access(inode, entry),
1676                                 &exception);
1677         } while (exception.retry);
1678         return err;
1679 }
1680
1681 /*
1682  * TODO: For the time being, we don't try to get any attributes
1683  * along with any of the zero-copy operations READ, READDIR,
1684  * READLINK, WRITE.
1685  *
1686  * In the case of the first three, we want to put the GETATTR
1687  * after the read-type operation -- this is because it is hard
1688  * to predict the length of a GETATTR response in v4, and thus
1689  * align the READ data correctly.  This means that the GETATTR
1690  * may end up partially falling into the page cache, and we should
1691  * shift it into the 'tail' of the xdr_buf before processing.
1692  * To do this efficiently, we need to know the total length
1693  * of data received, which doesn't seem to be available outside
1694  * of the RPC layer.
1695  *
1696  * In the case of WRITE, we also want to put the GETATTR after
1697  * the operation -- in this case because we want to make sure
1698  * we get the post-operation mtime and size.  This means that
1699  * we can't use xdr_encode_pages() as written: we need a variant
1700  * of it which would leave room in the 'tail' iovec.
1701  *
1702  * Both of these changes to the XDR layer would in fact be quite
1703  * minor, but I decided to leave them for a subsequent patch.
1704  */
1705 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1706                 unsigned int pgbase, unsigned int pglen)
1707 {
1708         struct nfs4_readlink args = {
1709                 .fh       = NFS_FH(inode),
1710                 .pgbase   = pgbase,
1711                 .pglen    = pglen,
1712                 .pages    = &page,
1713         };
1714         struct rpc_message msg = {
1715                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1716                 .rpc_argp = &args,
1717                 .rpc_resp = NULL,
1718         };
1719
1720         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1721 }
1722
1723 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1724                 unsigned int pgbase, unsigned int pglen)
1725 {
1726         struct nfs4_exception exception = { };
1727         int err;
1728         do {
1729                 err = nfs4_handle_exception(NFS_SERVER(inode),
1730                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1731                                 &exception);
1732         } while (exception.retry);
1733         return err;
1734 }
1735
1736 /*
1737  * Got race?
1738  * We will need to arrange for the VFS layer to provide an atomic open.
1739  * Until then, this create/open method is prone to inefficiency and race
1740  * conditions due to the lookup, create, and open VFS calls from sys_open()
1741  * placed on the wire.
1742  *
1743  * Given the above sorry state of affairs, I'm simply sending an OPEN.
1744  * The file will be opened again in the subsequent VFS open call
1745  * (nfs4_proc_file_open).
1746  *
1747  * The open for read will just hang around to be used by any process that
1748  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1749  */
1750
1751 static int
1752 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
1753                  int flags, struct nameidata *nd)
1754 {
1755         struct nfs4_state *state;
1756         struct rpc_cred *cred;
1757         int status = 0;
1758
1759         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1760         if (IS_ERR(cred)) {
1761                 status = PTR_ERR(cred);
1762                 goto out;
1763         }
1764         state = nfs4_do_open(dir, dentry, flags, sattr, cred);
1765         put_rpccred(cred);
1766         if (IS_ERR(state)) {
1767                 status = PTR_ERR(state);
1768                 goto out;
1769         }
1770         d_instantiate(dentry, igrab(state->inode));
1771         if (flags & O_EXCL) {
1772                 struct nfs_fattr fattr;
1773                 status = nfs4_do_setattr(state->inode, &fattr, sattr, state);
1774                 if (status == 0)
1775                         nfs_setattr_update_inode(state->inode, sattr);
1776         }
1777         if (status == 0 && nd != NULL && (nd->flags & LOOKUP_OPEN))
1778                 status = nfs4_intent_set_file(nd, dentry, state);
1779         else
1780                 nfs4_close_state(state, flags);
1781 out:
1782         return status;
1783 }
1784
1785 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1786 {
1787         struct nfs_server *server = NFS_SERVER(dir);
1788         struct nfs4_remove_arg args = {
1789                 .fh = NFS_FH(dir),
1790                 .name = name,
1791                 .bitmask = server->attr_bitmask,
1792         };
1793         struct nfs_fattr dir_attr;
1794         struct nfs4_remove_res  res = {
1795                 .server = server,
1796                 .dir_attr = &dir_attr,
1797         };
1798         struct rpc_message msg = {
1799                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1800                 .rpc_argp       = &args,
1801                 .rpc_resp       = &res,
1802         };
1803         int                     status;
1804
1805         nfs_fattr_init(res.dir_attr);
1806         status = rpc_call_sync(server->client, &msg, 0);
1807         if (status == 0) {
1808                 update_changeattr(dir, &res.cinfo);
1809                 nfs_post_op_update_inode(dir, res.dir_attr);
1810         }
1811         return status;
1812 }
1813
1814 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1815 {
1816         struct nfs4_exception exception = { };
1817         int err;
1818         do {
1819                 err = nfs4_handle_exception(NFS_SERVER(dir),
1820                                 _nfs4_proc_remove(dir, name),
1821                                 &exception);
1822         } while (exception.retry);
1823         return err;
1824 }
1825
1826 struct unlink_desc {
1827         struct nfs4_remove_arg  args;
1828         struct nfs4_remove_res  res;
1829         struct nfs_fattr dir_attr;
1830 };
1831
1832 static int nfs4_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir,
1833                 struct qstr *name)
1834 {
1835         struct nfs_server *server = NFS_SERVER(dir->d_inode);
1836         struct unlink_desc *up;
1837
1838         up = kmalloc(sizeof(*up), GFP_KERNEL);
1839         if (!up)
1840                 return -ENOMEM;
1841         
1842         up->args.fh = NFS_FH(dir->d_inode);
1843         up->args.name = name;
1844         up->args.bitmask = server->attr_bitmask;
1845         up->res.server = server;
1846         up->res.dir_attr = &up->dir_attr;
1847         
1848         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1849         msg->rpc_argp = &up->args;
1850         msg->rpc_resp = &up->res;
1851         return 0;
1852 }
1853
1854 static int nfs4_proc_unlink_done(struct dentry *dir, struct rpc_task *task)
1855 {
1856         struct rpc_message *msg = &task->tk_msg;
1857         struct unlink_desc *up;
1858         
1859         if (msg->rpc_resp != NULL) {
1860                 up = container_of(msg->rpc_resp, struct unlink_desc, res);
1861                 update_changeattr(dir->d_inode, &up->res.cinfo);
1862                 nfs_post_op_update_inode(dir->d_inode, up->res.dir_attr);
1863                 kfree(up);
1864                 msg->rpc_resp = NULL;
1865                 msg->rpc_argp = NULL;
1866         }
1867         return 0;
1868 }
1869
1870 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1871                 struct inode *new_dir, struct qstr *new_name)
1872 {
1873         struct nfs_server *server = NFS_SERVER(old_dir);
1874         struct nfs4_rename_arg arg = {
1875                 .old_dir = NFS_FH(old_dir),
1876                 .new_dir = NFS_FH(new_dir),
1877                 .old_name = old_name,
1878                 .new_name = new_name,
1879                 .bitmask = server->attr_bitmask,
1880         };
1881         struct nfs_fattr old_fattr, new_fattr;
1882         struct nfs4_rename_res res = {
1883                 .server = server,
1884                 .old_fattr = &old_fattr,
1885                 .new_fattr = &new_fattr,
1886         };
1887         struct rpc_message msg = {
1888                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
1889                 .rpc_argp = &arg,
1890                 .rpc_resp = &res,
1891         };
1892         int                     status;
1893         
1894         nfs_fattr_init(res.old_fattr);
1895         nfs_fattr_init(res.new_fattr);
1896         status = rpc_call_sync(server->client, &msg, 0);
1897
1898         if (!status) {
1899                 update_changeattr(old_dir, &res.old_cinfo);
1900                 nfs_post_op_update_inode(old_dir, res.old_fattr);
1901                 update_changeattr(new_dir, &res.new_cinfo);
1902                 nfs_post_op_update_inode(new_dir, res.new_fattr);
1903         }
1904         return status;
1905 }
1906
1907 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1908                 struct inode *new_dir, struct qstr *new_name)
1909 {
1910         struct nfs4_exception exception = { };
1911         int err;
1912         do {
1913                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
1914                                 _nfs4_proc_rename(old_dir, old_name,
1915                                         new_dir, new_name),
1916                                 &exception);
1917         } while (exception.retry);
1918         return err;
1919 }
1920
1921 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
1922 {
1923         struct nfs_server *server = NFS_SERVER(inode);
1924         struct nfs4_link_arg arg = {
1925                 .fh     = NFS_FH(inode),
1926                 .dir_fh = NFS_FH(dir),
1927                 .name   = name,
1928                 .bitmask = server->attr_bitmask,
1929         };
1930         struct nfs_fattr fattr, dir_attr;
1931         struct nfs4_link_res res = {
1932                 .server = server,
1933                 .fattr = &fattr,
1934                 .dir_attr = &dir_attr,
1935         };
1936         struct rpc_message msg = {
1937                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
1938                 .rpc_argp = &arg,
1939                 .rpc_resp = &res,
1940         };
1941         int                     status;
1942
1943         nfs_fattr_init(res.fattr);
1944         nfs_fattr_init(res.dir_attr);
1945         status = rpc_call_sync(server->client, &msg, 0);
1946         if (!status) {
1947                 update_changeattr(dir, &res.cinfo);
1948                 nfs_post_op_update_inode(dir, res.dir_attr);
1949                 nfs_post_op_update_inode(inode, res.fattr);
1950         }
1951
1952         return status;
1953 }
1954
1955 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
1956 {
1957         struct nfs4_exception exception = { };
1958         int err;
1959         do {
1960                 err = nfs4_handle_exception(NFS_SERVER(inode),
1961                                 _nfs4_proc_link(inode, dir, name),
1962                                 &exception);
1963         } while (exception.retry);
1964         return err;
1965 }
1966
1967 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
1968                 struct page *page, unsigned int len, struct iattr *sattr)
1969 {
1970         struct nfs_server *server = NFS_SERVER(dir);
1971         struct nfs_fh fhandle;
1972         struct nfs_fattr fattr, dir_fattr;
1973         struct nfs4_create_arg arg = {
1974                 .dir_fh = NFS_FH(dir),
1975                 .server = server,
1976                 .name = &dentry->d_name,
1977                 .attrs = sattr,
1978                 .ftype = NF4LNK,
1979                 .bitmask = server->attr_bitmask,
1980         };
1981         struct nfs4_create_res res = {
1982                 .server = server,
1983                 .fh = &fhandle,
1984                 .fattr = &fattr,
1985                 .dir_fattr = &dir_fattr,
1986         };
1987         struct rpc_message msg = {
1988                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
1989                 .rpc_argp = &arg,
1990                 .rpc_resp = &res,
1991         };
1992         int                     status;
1993
1994         if (len > NFS4_MAXPATHLEN)
1995                 return -ENAMETOOLONG;
1996
1997         arg.u.symlink.pages = &page;
1998         arg.u.symlink.len = len;
1999         nfs_fattr_init(&fattr);
2000         nfs_fattr_init(&dir_fattr);
2001         
2002         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2003         if (!status) {
2004                 update_changeattr(dir, &res.dir_cinfo);
2005                 nfs_post_op_update_inode(dir, res.dir_fattr);
2006                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2007         }
2008         return status;
2009 }
2010
2011 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2012                 struct page *page, unsigned int len, struct iattr *sattr)
2013 {
2014         struct nfs4_exception exception = { };
2015         int err;
2016         do {
2017                 err = nfs4_handle_exception(NFS_SERVER(dir),
2018                                 _nfs4_proc_symlink(dir, dentry, page,
2019                                                         len, sattr),
2020                                 &exception);
2021         } while (exception.retry);
2022         return err;
2023 }
2024
2025 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2026                 struct iattr *sattr)
2027 {
2028         struct nfs_server *server = NFS_SERVER(dir);
2029         struct nfs_fh fhandle;
2030         struct nfs_fattr fattr, dir_fattr;
2031         struct nfs4_create_arg arg = {
2032                 .dir_fh = NFS_FH(dir),
2033                 .server = server,
2034                 .name = &dentry->d_name,
2035                 .attrs = sattr,
2036                 .ftype = NF4DIR,
2037                 .bitmask = server->attr_bitmask,
2038         };
2039         struct nfs4_create_res res = {
2040                 .server = server,
2041                 .fh = &fhandle,
2042                 .fattr = &fattr,
2043                 .dir_fattr = &dir_fattr,
2044         };
2045         struct rpc_message msg = {
2046                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2047                 .rpc_argp = &arg,
2048                 .rpc_resp = &res,
2049         };
2050         int                     status;
2051
2052         nfs_fattr_init(&fattr);
2053         nfs_fattr_init(&dir_fattr);
2054         
2055         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2056         if (!status) {
2057                 update_changeattr(dir, &res.dir_cinfo);
2058                 nfs_post_op_update_inode(dir, res.dir_fattr);
2059                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2060         }
2061         return status;
2062 }
2063
2064 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2065                 struct iattr *sattr)
2066 {
2067         struct nfs4_exception exception = { };
2068         int err;
2069         do {
2070                 err = nfs4_handle_exception(NFS_SERVER(dir),
2071                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2072                                 &exception);
2073         } while (exception.retry);
2074         return err;
2075 }
2076
2077 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2078                   u64 cookie, struct page *page, unsigned int count, int plus)
2079 {
2080         struct inode            *dir = dentry->d_inode;
2081         struct nfs4_readdir_arg args = {
2082                 .fh = NFS_FH(dir),
2083                 .pages = &page,
2084                 .pgbase = 0,
2085                 .count = count,
2086                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2087         };
2088         struct nfs4_readdir_res res;
2089         struct rpc_message msg = {
2090                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2091                 .rpc_argp = &args,
2092                 .rpc_resp = &res,
2093                 .rpc_cred = cred,
2094         };
2095         int                     status;
2096
2097         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
2098                         dentry->d_parent->d_name.name,
2099                         dentry->d_name.name,
2100                         (unsigned long long)cookie);
2101         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2102         res.pgbase = args.pgbase;
2103         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2104         if (status == 0)
2105                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2106         dprintk("%s: returns %d\n", __FUNCTION__, status);
2107         return status;
2108 }
2109
2110 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2111                   u64 cookie, struct page *page, unsigned int count, int plus)
2112 {
2113         struct nfs4_exception exception = { };
2114         int err;
2115         do {
2116                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2117                                 _nfs4_proc_readdir(dentry, cred, cookie,
2118                                         page, count, plus),
2119                                 &exception);
2120         } while (exception.retry);
2121         return err;
2122 }
2123
2124 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2125                 struct iattr *sattr, dev_t rdev)
2126 {
2127         struct nfs_server *server = NFS_SERVER(dir);
2128         struct nfs_fh fh;
2129         struct nfs_fattr fattr, dir_fattr;
2130         struct nfs4_create_arg arg = {
2131                 .dir_fh = NFS_FH(dir),
2132                 .server = server,
2133                 .name = &dentry->d_name,
2134                 .attrs = sattr,
2135                 .bitmask = server->attr_bitmask,
2136         };
2137         struct nfs4_create_res res = {
2138                 .server = server,
2139                 .fh = &fh,
2140                 .fattr = &fattr,
2141                 .dir_fattr = &dir_fattr,
2142         };
2143         struct rpc_message msg = {
2144                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2145                 .rpc_argp = &arg,
2146                 .rpc_resp = &res,
2147         };
2148         int                     status;
2149         int                     mode = sattr->ia_mode;
2150
2151         nfs_fattr_init(&fattr);
2152         nfs_fattr_init(&dir_fattr);
2153
2154         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2155         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2156         if (S_ISFIFO(mode))
2157                 arg.ftype = NF4FIFO;
2158         else if (S_ISBLK(mode)) {
2159                 arg.ftype = NF4BLK;
2160                 arg.u.device.specdata1 = MAJOR(rdev);
2161                 arg.u.device.specdata2 = MINOR(rdev);
2162         }
2163         else if (S_ISCHR(mode)) {
2164                 arg.ftype = NF4CHR;
2165                 arg.u.device.specdata1 = MAJOR(rdev);
2166                 arg.u.device.specdata2 = MINOR(rdev);
2167         }
2168         else
2169                 arg.ftype = NF4SOCK;
2170         
2171         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2172         if (status == 0) {
2173                 update_changeattr(dir, &res.dir_cinfo);
2174                 nfs_post_op_update_inode(dir, res.dir_fattr);
2175                 status = nfs_instantiate(dentry, &fh, &fattr);
2176         }
2177         return status;
2178 }
2179
2180 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2181                 struct iattr *sattr, dev_t rdev)
2182 {
2183         struct nfs4_exception exception = { };
2184         int err;
2185         do {
2186                 err = nfs4_handle_exception(NFS_SERVER(dir),
2187                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2188                                 &exception);
2189         } while (exception.retry);
2190         return err;
2191 }
2192
2193 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2194                  struct nfs_fsstat *fsstat)
2195 {
2196         struct nfs4_statfs_arg args = {
2197                 .fh = fhandle,
2198                 .bitmask = server->attr_bitmask,
2199         };
2200         struct rpc_message msg = {
2201                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2202                 .rpc_argp = &args,
2203                 .rpc_resp = fsstat,
2204         };
2205
2206         nfs_fattr_init(fsstat->fattr);
2207         return rpc_call_sync(server->client, &msg, 0);
2208 }
2209
2210 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2211 {
2212         struct nfs4_exception exception = { };
2213         int err;
2214         do {
2215                 err = nfs4_handle_exception(server,
2216                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2217                                 &exception);
2218         } while (exception.retry);
2219         return err;
2220 }
2221
2222 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2223                 struct nfs_fsinfo *fsinfo)
2224 {
2225         struct nfs4_fsinfo_arg args = {
2226                 .fh = fhandle,
2227                 .bitmask = server->attr_bitmask,
2228         };
2229         struct rpc_message msg = {
2230                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2231                 .rpc_argp = &args,
2232                 .rpc_resp = fsinfo,
2233         };
2234
2235         return rpc_call_sync(server->client, &msg, 0);
2236 }
2237
2238 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2239 {
2240         struct nfs4_exception exception = { };
2241         int err;
2242
2243         do {
2244                 err = nfs4_handle_exception(server,
2245                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2246                                 &exception);
2247         } while (exception.retry);
2248         return err;
2249 }
2250
2251 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2252 {
2253         nfs_fattr_init(fsinfo->fattr);
2254         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2255 }
2256
2257 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2258                 struct nfs_pathconf *pathconf)
2259 {
2260         struct nfs4_pathconf_arg args = {
2261                 .fh = fhandle,
2262                 .bitmask = server->attr_bitmask,
2263         };
2264         struct rpc_message msg = {
2265                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2266                 .rpc_argp = &args,
2267                 .rpc_resp = pathconf,
2268         };
2269
2270         /* None of the pathconf attributes are mandatory to implement */
2271         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2272                 memset(pathconf, 0, sizeof(*pathconf));
2273                 return 0;
2274         }
2275
2276         nfs_fattr_init(pathconf->fattr);
2277         return rpc_call_sync(server->client, &msg, 0);
2278 }
2279
2280 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2281                 struct nfs_pathconf *pathconf)
2282 {
2283         struct nfs4_exception exception = { };
2284         int err;
2285
2286         do {
2287                 err = nfs4_handle_exception(server,
2288                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2289                                 &exception);
2290         } while (exception.retry);
2291         return err;
2292 }
2293
2294 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
2295 {
2296         struct nfs_server *server = NFS_SERVER(data->inode);
2297
2298         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
2299                 rpc_restart_call(task);
2300                 return -EAGAIN;
2301         }
2302         if (task->tk_status > 0)
2303                 renew_lease(server, data->timestamp);
2304         return 0;
2305 }
2306
2307 static void nfs4_proc_read_setup(struct nfs_read_data *data)
2308 {
2309         struct rpc_message msg = {
2310                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
2311                 .rpc_argp = &data->args,
2312                 .rpc_resp = &data->res,
2313                 .rpc_cred = data->cred,
2314         };
2315
2316         data->timestamp   = jiffies;
2317
2318         rpc_call_setup(&data->task, &msg, 0);
2319 }
2320
2321 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
2322 {
2323         struct inode *inode = data->inode;
2324         
2325         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2326                 rpc_restart_call(task);
2327                 return -EAGAIN;
2328         }
2329         if (task->tk_status >= 0) {
2330                 renew_lease(NFS_SERVER(inode), data->timestamp);
2331                 nfs_post_op_update_inode(inode, data->res.fattr);
2332         }
2333         return 0;
2334 }
2335
2336 static void nfs4_proc_write_setup(struct nfs_write_data *data, int how)
2337 {
2338         struct rpc_message msg = {
2339                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
2340                 .rpc_argp = &data->args,
2341                 .rpc_resp = &data->res,
2342                 .rpc_cred = data->cred,
2343         };
2344         struct inode *inode = data->inode;
2345         struct nfs_server *server = NFS_SERVER(inode);
2346         int stable;
2347         
2348         if (how & FLUSH_STABLE) {
2349                 if (!NFS_I(inode)->ncommit)
2350                         stable = NFS_FILE_SYNC;
2351                 else
2352                         stable = NFS_DATA_SYNC;
2353         } else
2354                 stable = NFS_UNSTABLE;
2355         data->args.stable = stable;
2356         data->args.bitmask = server->attr_bitmask;
2357         data->res.server = server;
2358
2359         data->timestamp   = jiffies;
2360
2361         /* Finalize the task. */
2362         rpc_call_setup(&data->task, &msg, 0);
2363 }
2364
2365 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
2366 {
2367         struct inode *inode = data->inode;
2368         
2369         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2370                 rpc_restart_call(task);
2371                 return -EAGAIN;
2372         }
2373         if (task->tk_status >= 0)
2374                 nfs_post_op_update_inode(inode, data->res.fattr);
2375         return 0;
2376 }
2377
2378 static void nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
2379 {
2380         struct rpc_message msg = {
2381                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2382                 .rpc_argp = &data->args,
2383                 .rpc_resp = &data->res,
2384                 .rpc_cred = data->cred,
2385         };      
2386         struct nfs_server *server = NFS_SERVER(data->inode);
2387         
2388         data->args.bitmask = server->attr_bitmask;
2389         data->res.server = server;
2390
2391         rpc_call_setup(&data->task, &msg, 0);
2392 }
2393
2394 /*
2395  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2396  * standalone procedure for queueing an asynchronous RENEW.
2397  */
2398 static void nfs4_renew_done(struct rpc_task *task, void *data)
2399 {
2400         struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
2401         unsigned long timestamp = (unsigned long)data;
2402
2403         if (task->tk_status < 0) {
2404                 switch (task->tk_status) {
2405                         case -NFS4ERR_STALE_CLIENTID:
2406                         case -NFS4ERR_EXPIRED:
2407                         case -NFS4ERR_CB_PATH_DOWN:
2408                                 nfs4_schedule_state_recovery(clp);
2409                 }
2410                 return;
2411         }
2412         spin_lock(&clp->cl_lock);
2413         if (time_before(clp->cl_last_renewal,timestamp))
2414                 clp->cl_last_renewal = timestamp;
2415         spin_unlock(&clp->cl_lock);
2416 }
2417
2418 static const struct rpc_call_ops nfs4_renew_ops = {
2419         .rpc_call_done = nfs4_renew_done,
2420 };
2421
2422 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
2423 {
2424         struct rpc_message msg = {
2425                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2426                 .rpc_argp       = clp,
2427                 .rpc_cred       = cred,
2428         };
2429
2430         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2431                         &nfs4_renew_ops, (void *)jiffies);
2432 }
2433
2434 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
2435 {
2436         struct rpc_message msg = {
2437                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2438                 .rpc_argp       = clp,
2439                 .rpc_cred       = cred,
2440         };
2441         unsigned long now = jiffies;
2442         int status;
2443
2444         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2445         if (status < 0)
2446                 return status;
2447         spin_lock(&clp->cl_lock);
2448         if (time_before(clp->cl_last_renewal,now))
2449                 clp->cl_last_renewal = now;
2450         spin_unlock(&clp->cl_lock);
2451         return 0;
2452 }
2453
2454 static inline int nfs4_server_supports_acls(struct nfs_server *server)
2455 {
2456         return (server->caps & NFS_CAP_ACLS)
2457                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2458                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2459 }
2460
2461 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2462  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2463  * the stack.
2464  */
2465 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2466
2467 static void buf_to_pages(const void *buf, size_t buflen,
2468                 struct page **pages, unsigned int *pgbase)
2469 {
2470         const void *p = buf;
2471
2472         *pgbase = offset_in_page(buf);
2473         p -= *pgbase;
2474         while (p < buf + buflen) {
2475                 *(pages++) = virt_to_page(p);
2476                 p += PAGE_CACHE_SIZE;
2477         }
2478 }
2479
2480 struct nfs4_cached_acl {
2481         int cached;
2482         size_t len;
2483         char data[0];
2484 };
2485
2486 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2487 {
2488         struct nfs_inode *nfsi = NFS_I(inode);
2489
2490         spin_lock(&inode->i_lock);
2491         kfree(nfsi->nfs4_acl);
2492         nfsi->nfs4_acl = acl;
2493         spin_unlock(&inode->i_lock);
2494 }
2495
2496 static void nfs4_zap_acl_attr(struct inode *inode)
2497 {
2498         nfs4_set_cached_acl(inode, NULL);
2499 }
2500
2501 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2502 {
2503         struct nfs_inode *nfsi = NFS_I(inode);
2504         struct nfs4_cached_acl *acl;
2505         int ret = -ENOENT;
2506
2507         spin_lock(&inode->i_lock);
2508         acl = nfsi->nfs4_acl;
2509         if (acl == NULL)
2510                 goto out;
2511         if (buf == NULL) /* user is just asking for length */
2512                 goto out_len;
2513         if (acl->cached == 0)
2514                 goto out;
2515         ret = -ERANGE; /* see getxattr(2) man page */
2516         if (acl->len > buflen)
2517                 goto out;
2518         memcpy(buf, acl->data, acl->len);
2519 out_len:
2520         ret = acl->len;
2521 out:
2522         spin_unlock(&inode->i_lock);
2523         return ret;
2524 }
2525
2526 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2527 {
2528         struct nfs4_cached_acl *acl;
2529
2530         if (buf && acl_len <= PAGE_SIZE) {
2531                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2532                 if (acl == NULL)
2533                         goto out;
2534                 acl->cached = 1;
2535                 memcpy(acl->data, buf, acl_len);
2536         } else {
2537                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2538                 if (acl == NULL)
2539                         goto out;
2540                 acl->cached = 0;
2541         }
2542         acl->len = acl_len;
2543 out:
2544         nfs4_set_cached_acl(inode, acl);
2545 }
2546
2547 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2548 {
2549         struct page *pages[NFS4ACL_MAXPAGES];
2550         struct nfs_getaclargs args = {
2551                 .fh = NFS_FH(inode),
2552                 .acl_pages = pages,
2553                 .acl_len = buflen,
2554         };
2555         size_t resp_len = buflen;
2556         void *resp_buf;
2557         struct rpc_message msg = {
2558                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2559                 .rpc_argp = &args,
2560                 .rpc_resp = &resp_len,
2561         };
2562         struct page *localpage = NULL;
2563         int ret;
2564
2565         if (buflen < PAGE_SIZE) {
2566                 /* As long as we're doing a round trip to the server anyway,
2567                  * let's be prepared for a page of acl data. */
2568                 localpage = alloc_page(GFP_KERNEL);
2569                 resp_buf = page_address(localpage);
2570                 if (localpage == NULL)
2571                         return -ENOMEM;
2572                 args.acl_pages[0] = localpage;
2573                 args.acl_pgbase = 0;
2574                 resp_len = args.acl_len = PAGE_SIZE;
2575         } else {
2576                 resp_buf = buf;
2577                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2578         }
2579         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2580         if (ret)
2581                 goto out_free;
2582         if (resp_len > args.acl_len)
2583                 nfs4_write_cached_acl(inode, NULL, resp_len);
2584         else
2585                 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2586         if (buf) {
2587                 ret = -ERANGE;
2588                 if (resp_len > buflen)
2589                         goto out_free;
2590                 if (localpage)
2591                         memcpy(buf, resp_buf, resp_len);
2592         }
2593         ret = resp_len;
2594 out_free:
2595         if (localpage)
2596                 __free_page(localpage);
2597         return ret;
2598 }
2599
2600 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2601 {
2602         struct nfs4_exception exception = { };
2603         ssize_t ret;
2604         do {
2605                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
2606                 if (ret >= 0)
2607                         break;
2608                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
2609         } while (exception.retry);
2610         return ret;
2611 }
2612
2613 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2614 {
2615         struct nfs_server *server = NFS_SERVER(inode);
2616         int ret;
2617
2618         if (!nfs4_server_supports_acls(server))
2619                 return -EOPNOTSUPP;
2620         ret = nfs_revalidate_inode(server, inode);
2621         if (ret < 0)
2622                 return ret;
2623         ret = nfs4_read_cached_acl(inode, buf, buflen);
2624         if (ret != -ENOENT)
2625                 return ret;
2626         return nfs4_get_acl_uncached(inode, buf, buflen);
2627 }
2628
2629 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2630 {
2631         struct nfs_server *server = NFS_SERVER(inode);
2632         struct page *pages[NFS4ACL_MAXPAGES];
2633         struct nfs_setaclargs arg = {
2634                 .fh             = NFS_FH(inode),
2635                 .acl_pages      = pages,
2636                 .acl_len        = buflen,
2637         };
2638         struct rpc_message msg = {
2639                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2640                 .rpc_argp       = &arg,
2641                 .rpc_resp       = NULL,
2642         };
2643         int ret;
2644
2645         if (!nfs4_server_supports_acls(server))
2646                 return -EOPNOTSUPP;
2647         nfs_inode_return_delegation(inode);
2648         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2649         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2650         if (ret == 0)
2651                 nfs4_write_cached_acl(inode, buf, buflen);
2652         return ret;
2653 }
2654
2655 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2656 {
2657         struct nfs4_exception exception = { };
2658         int err;
2659         do {
2660                 err = nfs4_handle_exception(NFS_SERVER(inode),
2661                                 __nfs4_proc_set_acl(inode, buf, buflen),
2662                                 &exception);
2663         } while (exception.retry);
2664         return err;
2665 }
2666
2667 static int
2668 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
2669 {
2670         struct nfs_client *clp = server->nfs_client;
2671
2672         if (!clp || task->tk_status >= 0)
2673                 return 0;
2674         switch(task->tk_status) {
2675                 case -NFS4ERR_STALE_CLIENTID:
2676                 case -NFS4ERR_STALE_STATEID:
2677                 case -NFS4ERR_EXPIRED:
2678                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2679                         nfs4_schedule_state_recovery(clp);
2680                         if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
2681                                 rpc_wake_up_task(task);
2682                         task->tk_status = 0;
2683                         return -EAGAIN;
2684                 case -NFS4ERR_DELAY:
2685                         nfs_inc_server_stats((struct nfs_server *) server,
2686                                                 NFSIOS_DELAY);
2687                 case -NFS4ERR_GRACE:
2688                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
2689                         task->tk_status = 0;
2690                         return -EAGAIN;
2691                 case -NFS4ERR_OLD_STATEID:
2692                         task->tk_status = 0;
2693                         return -EAGAIN;
2694         }
2695         task->tk_status = nfs4_map_errors(task->tk_status);
2696         return 0;
2697 }
2698
2699 static int nfs4_wait_bit_interruptible(void *word)
2700 {
2701         if (signal_pending(current))
2702                 return -ERESTARTSYS;
2703         schedule();
2704         return 0;
2705 }
2706
2707 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp)
2708 {
2709         sigset_t oldset;
2710         int res;
2711
2712         might_sleep();
2713
2714         rwsem_acquire(&clp->cl_sem.dep_map, 0, 0, _RET_IP_);
2715
2716         rpc_clnt_sigmask(clnt, &oldset);
2717         res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER,
2718                         nfs4_wait_bit_interruptible,
2719                         TASK_INTERRUPTIBLE);
2720         rpc_clnt_sigunmask(clnt, &oldset);
2721
2722         rwsem_release(&clp->cl_sem.dep_map, 1, _RET_IP_);
2723         return res;
2724 }
2725
2726 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2727 {
2728         sigset_t oldset;
2729         int res = 0;
2730
2731         might_sleep();
2732
2733         if (*timeout <= 0)
2734                 *timeout = NFS4_POLL_RETRY_MIN;
2735         if (*timeout > NFS4_POLL_RETRY_MAX)
2736                 *timeout = NFS4_POLL_RETRY_MAX;
2737         rpc_clnt_sigmask(clnt, &oldset);
2738         if (clnt->cl_intr) {
2739                 schedule_timeout_interruptible(*timeout);
2740                 if (signalled())
2741                         res = -ERESTARTSYS;
2742         } else
2743                 schedule_timeout_uninterruptible(*timeout);
2744         rpc_clnt_sigunmask(clnt, &oldset);
2745         *timeout <<= 1;
2746         return res;
2747 }
2748
2749 /* This is the error handling routine for processes that are allowed
2750  * to sleep.
2751  */
2752 int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
2753 {
2754         struct nfs_client *clp = server->nfs_client;
2755         int ret = errorcode;
2756
2757         exception->retry = 0;
2758         switch(errorcode) {
2759                 case 0:
2760                         return 0;
2761                 case -NFS4ERR_STALE_CLIENTID:
2762                 case -NFS4ERR_STALE_STATEID:
2763                 case -NFS4ERR_EXPIRED:
2764                         nfs4_schedule_state_recovery(clp);
2765                         ret = nfs4_wait_clnt_recover(server->client, clp);
2766                         if (ret == 0)
2767                                 exception->retry = 1;
2768                         break;
2769                 case -NFS4ERR_FILE_OPEN:
2770                 case -NFS4ERR_GRACE:
2771                 case -NFS4ERR_DELAY:
2772                         ret = nfs4_delay(server->client, &exception->timeout);
2773                         if (ret != 0)
2774                                 break;
2775                 case -NFS4ERR_OLD_STATEID:
2776                         exception->retry = 1;
2777         }
2778         /* We failed to handle the error */
2779         return nfs4_map_errors(ret);
2780 }
2781
2782 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
2783 {
2784         nfs4_verifier sc_verifier;
2785         struct nfs4_setclientid setclientid = {
2786                 .sc_verifier = &sc_verifier,
2787                 .sc_prog = program,
2788         };
2789         struct rpc_message msg = {
2790                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2791                 .rpc_argp = &setclientid,
2792                 .rpc_resp = clp,
2793                 .rpc_cred = cred,
2794         };
2795         __be32 *p;
2796         int loop = 0;
2797         int status;
2798
2799         p = (__be32*)sc_verifier.data;
2800         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2801         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2802
2803         for(;;) {
2804                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2805                                 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
2806                                 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.sin_addr),
2807                                 cred->cr_ops->cr_name,
2808                                 clp->cl_id_uniquifier);
2809                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2810                                 sizeof(setclientid.sc_netid), "tcp");
2811                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2812                                 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2813                                 clp->cl_ipaddr, port >> 8, port & 255);
2814
2815                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2816                 if (status != -NFS4ERR_CLID_INUSE)
2817                         break;
2818                 if (signalled())
2819                         break;
2820                 if (loop++ & 1)
2821                         ssleep(clp->cl_lease_time + 1);
2822                 else
2823                         if (++clp->cl_id_uniquifier == 0)
2824                                 break;
2825         }
2826         return status;
2827 }
2828
2829 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2830 {
2831         struct nfs_fsinfo fsinfo;
2832         struct rpc_message msg = {
2833                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2834                 .rpc_argp = clp,
2835                 .rpc_resp = &fsinfo,
2836                 .rpc_cred = cred,
2837         };
2838         unsigned long now;
2839         int status;
2840
2841         now = jiffies;
2842         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2843         if (status == 0) {
2844                 spin_lock(&clp->cl_lock);
2845                 clp->cl_lease_time = fsinfo.lease_time * HZ;
2846                 clp->cl_last_renewal = now;
2847                 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2848                 spin_unlock(&clp->cl_lock);
2849         }
2850         return status;
2851 }
2852
2853 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2854 {
2855         long timeout;
2856         int err;
2857         do {
2858                 err = _nfs4_proc_setclientid_confirm(clp, cred);
2859                 switch (err) {
2860                         case 0:
2861                                 return err;
2862                         case -NFS4ERR_RESOURCE:
2863                                 /* The IBM lawyers misread another document! */
2864                         case -NFS4ERR_DELAY:
2865                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
2866                 }
2867         } while (err == 0);
2868         return err;
2869 }
2870
2871 struct nfs4_delegreturndata {
2872         struct nfs4_delegreturnargs args;
2873         struct nfs4_delegreturnres res;
2874         struct nfs_fh fh;
2875         nfs4_stateid stateid;
2876         struct rpc_cred *cred;
2877         unsigned long timestamp;
2878         struct nfs_fattr fattr;
2879         int rpc_status;
2880 };
2881
2882 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *calldata)
2883 {
2884         struct nfs4_delegreturndata *data = calldata;
2885         struct rpc_message msg = {
2886                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
2887                 .rpc_argp = &data->args,
2888                 .rpc_resp = &data->res,
2889                 .rpc_cred = data->cred,
2890         };
2891         nfs_fattr_init(data->res.fattr);
2892         rpc_call_setup(task, &msg, 0);
2893 }
2894
2895 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
2896 {
2897         struct nfs4_delegreturndata *data = calldata;
2898         data->rpc_status = task->tk_status;
2899         if (data->rpc_status == 0)
2900                 renew_lease(data->res.server, data->timestamp);
2901 }
2902
2903 static void nfs4_delegreturn_release(void *calldata)
2904 {
2905         struct nfs4_delegreturndata *data = calldata;
2906
2907         put_rpccred(data->cred);
2908         kfree(calldata);
2909 }
2910
2911 static const struct rpc_call_ops nfs4_delegreturn_ops = {
2912         .rpc_call_prepare = nfs4_delegreturn_prepare,
2913         .rpc_call_done = nfs4_delegreturn_done,
2914         .rpc_release = nfs4_delegreturn_release,
2915 };
2916
2917 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2918 {
2919         struct nfs4_delegreturndata *data;
2920         struct nfs_server *server = NFS_SERVER(inode);
2921         struct rpc_task *task;
2922         int status;
2923
2924         data = kmalloc(sizeof(*data), GFP_KERNEL);
2925         if (data == NULL)
2926                 return -ENOMEM;
2927         data->args.fhandle = &data->fh;
2928         data->args.stateid = &data->stateid;
2929         data->args.bitmask = server->attr_bitmask;
2930         nfs_copy_fh(&data->fh, NFS_FH(inode));
2931         memcpy(&data->stateid, stateid, sizeof(data->stateid));
2932         data->res.fattr = &data->fattr;
2933         data->res.server = server;
2934         data->cred = get_rpccred(cred);
2935         data->timestamp = jiffies;
2936         data->rpc_status = 0;
2937
2938         task = rpc_run_task(NFS_CLIENT(inode), RPC_TASK_ASYNC, &nfs4_delegreturn_ops, data);
2939         if (IS_ERR(task))
2940                 return PTR_ERR(task);
2941         status = nfs4_wait_for_completion_rpc_task(task);
2942         if (status == 0) {
2943                 status = data->rpc_status;
2944                 if (status == 0)
2945                         nfs_post_op_update_inode(inode, &data->fattr);
2946         }
2947         rpc_put_task(task);
2948         return status;
2949 }
2950
2951 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2952 {
2953         struct nfs_server *server = NFS_SERVER(inode);
2954         struct nfs4_exception exception = { };
2955         int err;
2956         do {
2957                 err = _nfs4_proc_delegreturn(inode, cred, stateid);
2958                 switch (err) {
2959                         case -NFS4ERR_STALE_STATEID:
2960                         case -NFS4ERR_EXPIRED:
2961                         case 0:
2962                                 return 0;
2963                 }
2964                 err = nfs4_handle_exception(server, err, &exception);
2965         } while (exception.retry);
2966         return err;
2967 }
2968
2969 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
2970 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
2971
2972 /* 
2973  * sleep, with exponential backoff, and retry the LOCK operation. 
2974  */
2975 static unsigned long
2976 nfs4_set_lock_task_retry(unsigned long timeout)
2977 {
2978         schedule_timeout_interruptible(timeout);
2979         timeout <<= 1;
2980         if (timeout > NFS4_LOCK_MAXTIMEOUT)
2981                 return NFS4_LOCK_MAXTIMEOUT;
2982         return timeout;
2983 }
2984
2985 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
2986 {
2987         struct inode *inode = state->inode;
2988         struct nfs_server *server = NFS_SERVER(inode);
2989         struct nfs_client *clp = server->nfs_client;
2990         struct nfs_lockt_args arg = {
2991                 .fh = NFS_FH(inode),
2992                 .fl = request,
2993         };
2994         struct nfs_lockt_res res = {
2995                 .denied = request,
2996         };
2997         struct rpc_message msg = {
2998                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
2999                 .rpc_argp       = &arg,
3000                 .rpc_resp       = &res,
3001                 .rpc_cred       = state->owner->so_cred,
3002         };
3003         struct nfs4_lock_state *lsp;
3004         int status;
3005
3006         down_read(&clp->cl_sem);
3007         arg.lock_owner.clientid = clp->cl_clientid;
3008         status = nfs4_set_lock_state(state, request);
3009         if (status != 0)
3010                 goto out;
3011         lsp = request->fl_u.nfs4_fl.owner;
3012         arg.lock_owner.id = lsp->ls_id; 
3013         status = rpc_call_sync(server->client, &msg, 0);
3014         switch (status) {
3015                 case 0:
3016                         request->fl_type = F_UNLCK;
3017                         break;
3018                 case -NFS4ERR_DENIED:
3019                         status = 0;
3020         }
3021         request->fl_ops->fl_release_private(request);
3022 out:
3023         up_read(&clp->cl_sem);
3024         return status;
3025 }
3026
3027 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3028 {
3029         struct nfs4_exception exception = { };
3030         int err;
3031
3032         do {
3033                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3034                                 _nfs4_proc_getlk(state, cmd, request),
3035                                 &exception);
3036         } while (exception.retry);
3037         return err;
3038 }
3039
3040 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3041 {
3042         int res = 0;
3043         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3044                 case FL_POSIX:
3045                         res = posix_lock_file_wait(file, fl);
3046                         break;
3047                 case FL_FLOCK:
3048                         res = flock_lock_file_wait(file, fl);
3049                         break;
3050                 default:
3051                         BUG();
3052         }
3053         return res;
3054 }
3055
3056 struct nfs4_unlockdata {
3057         struct nfs_locku_args arg;
3058         struct nfs_locku_res res;
3059         struct nfs4_lock_state *lsp;
3060         struct nfs_open_context *ctx;
3061         struct file_lock fl;
3062         const struct nfs_server *server;
3063         unsigned long timestamp;
3064 };
3065
3066 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3067                 struct nfs_open_context *ctx,
3068                 struct nfs4_lock_state *lsp,
3069                 struct nfs_seqid *seqid)
3070 {
3071         struct nfs4_unlockdata *p;
3072         struct inode *inode = lsp->ls_state->inode;
3073
3074         p = kmalloc(sizeof(*p), GFP_KERNEL);
3075         if (p == NULL)
3076                 return NULL;
3077         p->arg.fh = NFS_FH(inode);
3078         p->arg.fl = &p->fl;
3079         p->arg.seqid = seqid;
3080         p->arg.stateid = &lsp->ls_stateid;
3081         p->lsp = lsp;
3082         atomic_inc(&lsp->ls_count);
3083         /* Ensure we don't close file until we're done freeing locks! */
3084         p->ctx = get_nfs_open_context(ctx);
3085         memcpy(&p->fl, fl, sizeof(p->fl));
3086         p->server = NFS_SERVER(inode);
3087         return p;
3088 }
3089
3090 static void nfs4_locku_release_calldata(void *data)
3091 {
3092         struct nfs4_unlockdata *calldata = data;
3093         nfs_free_seqid(calldata->arg.seqid);
3094         nfs4_put_lock_state(calldata->lsp);
3095         put_nfs_open_context(calldata->ctx);
3096         kfree(calldata);
3097 }
3098
3099 static void nfs4_locku_done(struct rpc_task *task, void *data)
3100 {
3101         struct nfs4_unlockdata *calldata = data;
3102
3103         if (RPC_ASSASSINATED(task))
3104                 return;
3105         nfs_increment_lock_seqid(task->tk_status, calldata->arg.seqid);
3106         switch (task->tk_status) {
3107                 case 0:
3108                         memcpy(calldata->lsp->ls_stateid.data,
3109                                         calldata->res.stateid.data,
3110                                         sizeof(calldata->lsp->ls_stateid.data));
3111                         renew_lease(calldata->server, calldata->timestamp);
3112                         break;
3113                 case -NFS4ERR_STALE_STATEID:
3114                 case -NFS4ERR_EXPIRED:
3115                         break;
3116                 default:
3117                         if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN)
3118                                 rpc_restart_call(task);
3119         }
3120 }
3121
3122 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3123 {
3124         struct nfs4_unlockdata *calldata = data;
3125         struct rpc_message msg = {
3126                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3127                 .rpc_argp       = &calldata->arg,
3128                 .rpc_resp       = &calldata->res,
3129                 .rpc_cred       = calldata->lsp->ls_state->owner->so_cred,
3130         };
3131
3132         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3133                 return;
3134         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3135                 /* Note: exit _without_ running nfs4_locku_done */
3136                 task->tk_action = NULL;
3137                 return;
3138         }
3139         calldata->timestamp = jiffies;
3140         rpc_call_setup(task, &msg, 0);
3141 }
3142
3143 static const struct rpc_call_ops nfs4_locku_ops = {
3144         .rpc_call_prepare = nfs4_locku_prepare,
3145         .rpc_call_done = nfs4_locku_done,
3146         .rpc_release = nfs4_locku_release_calldata,
3147 };
3148
3149 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3150                 struct nfs_open_context *ctx,
3151                 struct nfs4_lock_state *lsp,
3152                 struct nfs_seqid *seqid)
3153 {
3154         struct nfs4_unlockdata *data;
3155
3156         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3157         if (data == NULL) {
3158                 nfs_free_seqid(seqid);
3159                 return ERR_PTR(-ENOMEM);
3160         }
3161
3162         return rpc_run_task(NFS_CLIENT(lsp->ls_state->inode), RPC_TASK_ASYNC, &nfs4_locku_ops, data);
3163 }
3164
3165 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3166 {
3167         struct nfs_seqid *seqid;
3168         struct nfs4_lock_state *lsp;
3169         struct rpc_task *task;
3170         int status = 0;
3171
3172         status = nfs4_set_lock_state(state, request);
3173         /* Unlock _before_ we do the RPC call */
3174         request->fl_flags |= FL_EXISTS;
3175         if (do_vfs_lock(request->fl_file, request) == -ENOENT)
3176                 goto out;
3177         if (status != 0)
3178                 goto out;
3179         /* Is this a delegated lock? */
3180         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3181                 goto out;
3182         lsp = request->fl_u.nfs4_fl.owner;
3183         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3184         status = -ENOMEM;
3185         if (seqid == NULL)
3186                 goto out;
3187         task = nfs4_do_unlck(request, request->fl_file->private_data, lsp, seqid);
3188         status = PTR_ERR(task);
3189         if (IS_ERR(task))
3190                 goto out;
3191         status = nfs4_wait_for_completion_rpc_task(task);
3192         rpc_put_task(task);
3193 out:
3194         return status;
3195 }
3196
3197 struct nfs4_lockdata {
3198         struct nfs_lock_args arg;
3199         struct nfs_lock_res res;
3200         struct nfs4_lock_state *lsp;
3201         struct nfs_open_context *ctx;
3202         struct file_lock fl;
3203         unsigned long timestamp;
3204         int rpc_status;
3205         int cancelled;
3206 };
3207
3208 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3209                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3210 {
3211         struct nfs4_lockdata *p;
3212         struct inode *inode = lsp->ls_state->inode;
3213         struct nfs_server *server = NFS_SERVER(inode);
3214
3215         p = kzalloc(sizeof(*p), GFP_KERNEL);
3216         if (p == NULL)
3217                 return NULL;
3218
3219         p->arg.fh = NFS_FH(inode);
3220         p->arg.fl = &p->fl;
3221         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3222         if (p->arg.lock_seqid == NULL)
3223                 goto out_free;
3224         p->arg.lock_stateid = &lsp->ls_stateid;
3225         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3226         p->arg.lock_owner.id = lsp->ls_id;
3227         p->lsp = lsp;
3228         atomic_inc(&lsp->ls_count);
3229         p->ctx = get_nfs_open_context(ctx);
3230         memcpy(&p->fl, fl, sizeof(p->fl));
3231         return p;
3232 out_free:
3233         kfree(p);
3234         return NULL;
3235 }
3236
3237 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3238 {
3239         struct nfs4_lockdata *data = calldata;
3240         struct nfs4_state *state = data->lsp->ls_state;
3241         struct nfs4_state_owner *sp = state->owner;
3242         struct rpc_message msg = {
3243                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3244                 .rpc_argp = &data->arg,
3245                 .rpc_resp = &data->res,
3246                 .rpc_cred = sp->so_cred,
3247         };
3248
3249         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3250                 return;
3251         dprintk("%s: begin!\n", __FUNCTION__);
3252         /* Do we need to do an open_to_lock_owner? */
3253         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3254                 data->arg.open_seqid = nfs_alloc_seqid(&sp->so_seqid);
3255                 if (data->arg.open_seqid == NULL) {
3256                         data->rpc_status = -ENOMEM;
3257                         task->tk_action = NULL;
3258                         goto out;
3259                 }
3260                 data->arg.open_stateid = &state->stateid;
3261                 data->arg.new_lock_owner = 1;
3262         }
3263         data->timestamp = jiffies;
3264         rpc_call_setup(task, &msg, 0);
3265 out:
3266         dprintk("%s: done!, ret = %d\n", __FUNCTION__, data->rpc_status);
3267 }
3268
3269 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3270 {
3271         struct nfs4_lockdata *data = calldata;
3272
3273         dprintk("%s: begin!\n", __FUNCTION__);
3274
3275         data->rpc_status = task->tk_status;
3276         if (RPC_ASSASSINATED(task))
3277                 goto out;
3278         if (data->arg.new_lock_owner != 0) {
3279                 nfs_increment_open_seqid(data->rpc_status, data->arg.open_seqid);
3280                 if (data->rpc_status == 0)
3281                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3282                 else
3283                         goto out;
3284         }
3285         if (data->rpc_status == 0) {
3286                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3287                                         sizeof(data->lsp->ls_stateid.data));
3288                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3289                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
3290         }
3291         nfs_increment_lock_seqid(data->rpc_status, data->arg.lock_seqid);
3292 out:
3293         dprintk("%s: done, ret = %d!\n", __FUNCTION__, data->rpc_status);
3294 }
3295
3296 static void nfs4_lock_release(void *calldata)
3297 {
3298         struct nfs4_lockdata *data = calldata;
3299
3300         dprintk("%s: begin!\n", __FUNCTION__);
3301         if (data->arg.open_seqid != NULL)
3302                 nfs_free_seqid(data->arg.open_seqid);
3303         if (data->cancelled != 0) {
3304                 struct rpc_task *task;
3305                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3306                                 data->arg.lock_seqid);
3307                 if (!IS_ERR(task))
3308                         rpc_put_task(task);
3309                 dprintk("%s: cancelling lock!\n", __FUNCTION__);
3310         } else
3311                 nfs_free_seqid(data->arg.lock_seqid);
3312         nfs4_put_lock_state(data->lsp);
3313         put_nfs_open_context(data->ctx);
3314         kfree(data);
3315         dprintk("%s: done!\n", __FUNCTION__);
3316 }
3317
3318 static const struct rpc_call_ops nfs4_lock_ops = {
3319         .rpc_call_prepare = nfs4_lock_prepare,
3320         .rpc_call_done = nfs4_lock_done,
3321         .rpc_release = nfs4_lock_release,
3322 };
3323
3324 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3325 {
3326         struct nfs4_lockdata *data;
3327         struct rpc_task *task;
3328         int ret;
3329
3330         dprintk("%s: begin!\n", __FUNCTION__);
3331         data = nfs4_alloc_lockdata(fl, fl->fl_file->private_data,
3332                         fl->fl_u.nfs4_fl.owner);
3333         if (data == NULL)
3334                 return -ENOMEM;
3335         if (IS_SETLKW(cmd))
3336                 data->arg.block = 1;
3337         if (reclaim != 0)
3338                 data->arg.reclaim = 1;
3339         task = rpc_run_task(NFS_CLIENT(state->inode), RPC_TASK_ASYNC,
3340                         &nfs4_lock_ops, data);
3341         if (IS_ERR(task))
3342                 return PTR_ERR(task);
3343         ret = nfs4_wait_for_completion_rpc_task(task);
3344         if (ret == 0) {
3345                 ret = data->rpc_status;
3346                 if (ret == -NFS4ERR_DENIED)
3347                         ret = -EAGAIN;
3348         } else
3349                 data->cancelled = 1;
3350         rpc_put_task(task);
3351         dprintk("%s: done, ret = %d!\n", __FUNCTION__, ret);
3352         return ret;
3353 }
3354
3355 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3356 {
3357         struct nfs_server *server = NFS_SERVER(state->inode);
3358         struct nfs4_exception exception = { };
3359         int err;
3360
3361         do {
3362                 /* Cache the lock if possible... */
3363                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3364                         return 0;
3365                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3366                 if (err != -NFS4ERR_DELAY)
3367                         break;
3368                 nfs4_handle_exception(server, err, &exception);
3369         } while (exception.retry);
3370         return err;
3371 }
3372
3373 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3374 {
3375         struct nfs_server *server = NFS_SERVER(state->inode);
3376         struct nfs4_exception exception = { };
3377         int err;
3378
3379         err = nfs4_set_lock_state(state, request);
3380         if (err != 0)
3381                 return err;
3382         do {
3383                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3384                         return 0;
3385                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3386                 if (err != -NFS4ERR_DELAY)
3387                         break;
3388                 nfs4_handle_exception(server, err, &exception);
3389         } while (exception.retry);
3390         return err;
3391 }
3392
3393 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3394 {
3395         struct nfs_client *clp = state->owner->so_client;
3396         unsigned char fl_flags = request->fl_flags;
3397         int status;
3398
3399         /* Is this a delegated open? */
3400         status = nfs4_set_lock_state(state, request);
3401         if (status != 0)
3402                 goto out;
3403         request->fl_flags |= FL_ACCESS;
3404         status = do_vfs_lock(request->fl_file, request);
3405         if (status < 0)
3406                 goto out;
3407         down_read(&clp->cl_sem);
3408         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3409                 struct nfs_inode *nfsi = NFS_I(state->inode);
3410                 /* Yes: cache locks! */
3411                 down_read(&nfsi->rwsem);
3412                 /* ...but avoid races with delegation recall... */
3413                 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3414                         request->fl_flags = fl_flags & ~FL_SLEEP;
3415                         status = do_vfs_lock(request->fl_file, request);
3416                         up_read(&nfsi->rwsem);
3417                         goto out_unlock;
3418                 }
3419                 up_read(&nfsi->rwsem);
3420         }
3421         status = _nfs4_do_setlk(state, cmd, request, 0);
3422         if (status != 0)
3423                 goto out_unlock;
3424         /* Note: we always want to sleep here! */
3425         request->fl_flags = fl_flags | FL_SLEEP;
3426         if (do_vfs_lock(request->fl_file, request) < 0)
3427                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
3428 out_unlock:
3429         up_read(&clp->cl_sem);
3430 out:
3431         request->fl_flags = fl_flags;
3432         return status;
3433 }
3434
3435 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3436 {
3437         struct nfs4_exception exception = { };
3438         int err;
3439
3440         do {
3441                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3442                                 _nfs4_proc_setlk(state, cmd, request),
3443                                 &exception);
3444         } while (exception.retry);
3445         return err;
3446 }
3447
3448 static int
3449 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3450 {
3451         struct nfs_open_context *ctx;
3452         struct nfs4_state *state;
3453         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3454         int status;
3455
3456         /* verify open state */
3457         ctx = (struct nfs_open_context *)filp->private_data;
3458         state = ctx->state;
3459
3460         if (request->fl_start < 0 || request->fl_end < 0)
3461                 return -EINVAL;
3462
3463         if (IS_GETLK(cmd))
3464                 return nfs4_proc_getlk(state, F_GETLK, request);
3465
3466         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3467                 return -EINVAL;
3468
3469         if (request->fl_type == F_UNLCK)
3470                 return nfs4_proc_unlck(state, cmd, request);
3471
3472         do {
3473                 status = nfs4_proc_setlk(state, cmd, request);
3474                 if ((status != -EAGAIN) || IS_SETLK(cmd))
3475                         break;
3476                 timeout = nfs4_set_lock_task_retry(timeout);
3477                 status = -ERESTARTSYS;
3478                 if (signalled())
3479                         break;
3480         } while(status < 0);
3481         return status;
3482 }
3483
3484 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3485 {
3486         struct nfs_server *server = NFS_SERVER(state->inode);
3487         struct nfs4_exception exception = { };
3488         int err;
3489
3490         err = nfs4_set_lock_state(state, fl);
3491         if (err != 0)
3492                 goto out;
3493         do {
3494                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3495                 if (err != -NFS4ERR_DELAY)
3496                         break;
3497                 err = nfs4_handle_exception(server, err, &exception);
3498         } while (exception.retry);
3499 out:
3500         return err;
3501 }
3502
3503 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3504
3505 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3506                 size_t buflen, int flags)
3507 {
3508         struct inode *inode = dentry->d_inode;
3509
3510         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3511                 return -EOPNOTSUPP;
3512
3513         if (!S_ISREG(inode->i_mode) &&
3514             (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
3515                 return -EPERM;
3516
3517         return nfs4_proc_set_acl(inode, buf, buflen);
3518 }
3519
3520 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
3521  * and that's what we'll do for e.g. user attributes that haven't been set.
3522  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3523  * attributes in kernel-managed attribute namespaces. */
3524 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3525                 size_t buflen)
3526 {
3527         struct inode *inode = dentry->d_inode;
3528
3529         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3530                 return -EOPNOTSUPP;
3531
3532         return nfs4_proc_get_acl(inode, buf, buflen);
3533 }
3534
3535 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3536 {
3537         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
3538
3539         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3540                 return 0;
3541         if (buf && buflen < len)
3542                 return -ERANGE;
3543         if (buf)
3544                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3545         return len;
3546 }
3547
3548 int nfs4_proc_fs_locations(struct inode *dir, struct qstr *name,
3549                 struct nfs4_fs_locations *fs_locations, struct page *page)
3550 {
3551         struct nfs_server *server = NFS_SERVER(dir);
3552         u32 bitmask[2] = {
3553                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3554                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
3555         };
3556         struct nfs4_fs_locations_arg args = {
3557                 .dir_fh = NFS_FH(dir),
3558                 .name = name,
3559                 .page = page,
3560                 .bitmask = bitmask,
3561         };
3562         struct rpc_message msg = {
3563                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3564                 .rpc_argp = &args,
3565                 .rpc_resp = fs_locations,
3566         };
3567         int status;
3568
3569         dprintk("%s: start\n", __FUNCTION__);
3570         nfs_fattr_init(&fs_locations->fattr);
3571         fs_locations->server = server;
3572         fs_locations->nlocations = 0;
3573         status = rpc_call_sync(server->client, &msg, 0);
3574         dprintk("%s: returned status = %d\n", __FUNCTION__, status);
3575         return status;
3576 }
3577
3578 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3579         .recover_open   = nfs4_open_reclaim,
3580         .recover_lock   = nfs4_lock_reclaim,
3581 };
3582
3583 struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3584         .recover_open   = nfs4_open_expired,
3585         .recover_lock   = nfs4_lock_expired,
3586 };
3587
3588 static const struct inode_operations nfs4_file_inode_operations = {
3589         .permission     = nfs_permission,
3590         .getattr        = nfs_getattr,
3591         .setattr        = nfs_setattr,
3592         .getxattr       = nfs4_getxattr,
3593         .setxattr       = nfs4_setxattr,
3594         .listxattr      = nfs4_listxattr,
3595 };
3596
3597 const struct nfs_rpc_ops nfs_v4_clientops = {
3598         .version        = 4,                    /* protocol version */
3599         .dentry_ops     = &nfs4_dentry_operations,
3600         .dir_inode_ops  = &nfs4_dir_inode_operations,
3601         .file_inode_ops = &nfs4_file_inode_operations,
3602         .getroot        = nfs4_proc_get_root,
3603         .getattr        = nfs4_proc_getattr,
3604         .setattr        = nfs4_proc_setattr,
3605         .lookupfh       = nfs4_proc_lookupfh,
3606         .lookup         = nfs4_proc_lookup,
3607         .access         = nfs4_proc_access,
3608         .readlink       = nfs4_proc_readlink,
3609         .create         = nfs4_proc_create,
3610         .remove         = nfs4_proc_remove,
3611         .unlink_setup   = nfs4_proc_unlink_setup,
3612         .unlink_done    = nfs4_proc_unlink_done,
3613         .rename         = nfs4_proc_rename,
3614         .link           = nfs4_proc_link,
3615         .symlink        = nfs4_proc_symlink,
3616         .mkdir          = nfs4_proc_mkdir,
3617         .rmdir          = nfs4_proc_remove,
3618         .readdir        = nfs4_proc_readdir,
3619         .mknod          = nfs4_proc_mknod,
3620         .statfs         = nfs4_proc_statfs,
3621         .fsinfo         = nfs4_proc_fsinfo,
3622         .pathconf       = nfs4_proc_pathconf,
3623         .set_capabilities = nfs4_server_capabilities,
3624         .decode_dirent  = nfs4_decode_dirent,
3625         .read_setup     = nfs4_proc_read_setup,
3626         .read_done      = nfs4_read_done,
3627         .write_setup    = nfs4_proc_write_setup,
3628         .write_done     = nfs4_write_done,
3629         .commit_setup   = nfs4_proc_commit_setup,
3630         .commit_done    = nfs4_commit_done,
3631         .file_open      = nfs_open,
3632         .file_release   = nfs_release,
3633         .lock           = nfs4_proc_lock,
3634         .clear_acl_cache = nfs4_zap_acl_attr,
3635 };
3636
3637 /*
3638  * Local variables:
3639  *  c-basic-offset: 8
3640  * End:
3641  */