nfs41: Don't clear DRAINING flag on NFS4ERR_STALE_CLIENTID
[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/delay.h>
40 #include <linux/errno.h>
41 #include <linux/string.h>
42 #include <linux/sunrpc/clnt.h>
43 #include <linux/nfs.h>
44 #include <linux/nfs4.h>
45 #include <linux/nfs_fs.h>
46 #include <linux/nfs_page.h>
47 #include <linux/namei.h>
48 #include <linux/mount.h>
49 #include <linux/module.h>
50 #include <linux/sunrpc/bc_xprt.h>
51
52 #include "nfs4_fs.h"
53 #include "delegation.h"
54 #include "internal.h"
55 #include "iostat.h"
56 #include "callback.h"
57
58 #define NFSDBG_FACILITY         NFSDBG_PROC
59
60 #define NFS4_POLL_RETRY_MIN     (HZ/10)
61 #define NFS4_POLL_RETRY_MAX     (15*HZ)
62
63 #define NFS4_MAX_LOOP_ON_RECOVER (10)
64
65 struct nfs4_opendata;
66 static int _nfs4_proc_open(struct nfs4_opendata *data);
67 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
68 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
69 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
70 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
71
72 /* Prevent leaks of NFSv4 errors into userland */
73 static int nfs4_map_errors(int err)
74 {
75         if (err >= -1000)
76                 return err;
77         switch (err) {
78         case -NFS4ERR_RESOURCE:
79                 return -EREMOTEIO;
80         default:
81                 dprintk("%s could not handle NFSv4 error %d\n",
82                                 __func__, -err);
83                 break;
84         }
85         return -EIO;
86 }
87
88 /*
89  * This is our standard bitmap for GETATTR requests.
90  */
91 const u32 nfs4_fattr_bitmap[2] = {
92         FATTR4_WORD0_TYPE
93         | FATTR4_WORD0_CHANGE
94         | FATTR4_WORD0_SIZE
95         | FATTR4_WORD0_FSID
96         | FATTR4_WORD0_FILEID,
97         FATTR4_WORD1_MODE
98         | FATTR4_WORD1_NUMLINKS
99         | FATTR4_WORD1_OWNER
100         | FATTR4_WORD1_OWNER_GROUP
101         | FATTR4_WORD1_RAWDEV
102         | FATTR4_WORD1_SPACE_USED
103         | FATTR4_WORD1_TIME_ACCESS
104         | FATTR4_WORD1_TIME_METADATA
105         | FATTR4_WORD1_TIME_MODIFY
106 };
107
108 const u32 nfs4_statfs_bitmap[2] = {
109         FATTR4_WORD0_FILES_AVAIL
110         | FATTR4_WORD0_FILES_FREE
111         | FATTR4_WORD0_FILES_TOTAL,
112         FATTR4_WORD1_SPACE_AVAIL
113         | FATTR4_WORD1_SPACE_FREE
114         | FATTR4_WORD1_SPACE_TOTAL
115 };
116
117 const u32 nfs4_pathconf_bitmap[2] = {
118         FATTR4_WORD0_MAXLINK
119         | FATTR4_WORD0_MAXNAME,
120         0
121 };
122
123 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
124                         | FATTR4_WORD0_MAXREAD
125                         | FATTR4_WORD0_MAXWRITE
126                         | FATTR4_WORD0_LEASE_TIME,
127                         0
128 };
129
130 const u32 nfs4_fs_locations_bitmap[2] = {
131         FATTR4_WORD0_TYPE
132         | FATTR4_WORD0_CHANGE
133         | FATTR4_WORD0_SIZE
134         | FATTR4_WORD0_FSID
135         | FATTR4_WORD0_FILEID
136         | FATTR4_WORD0_FS_LOCATIONS,
137         FATTR4_WORD1_MODE
138         | FATTR4_WORD1_NUMLINKS
139         | FATTR4_WORD1_OWNER
140         | FATTR4_WORD1_OWNER_GROUP
141         | FATTR4_WORD1_RAWDEV
142         | FATTR4_WORD1_SPACE_USED
143         | FATTR4_WORD1_TIME_ACCESS
144         | FATTR4_WORD1_TIME_METADATA
145         | FATTR4_WORD1_TIME_MODIFY
146         | FATTR4_WORD1_MOUNTED_ON_FILEID
147 };
148
149 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
150                 struct nfs4_readdir_arg *readdir)
151 {
152         __be32 *start, *p;
153
154         BUG_ON(readdir->count < 80);
155         if (cookie > 2) {
156                 readdir->cookie = cookie;
157                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
158                 return;
159         }
160
161         readdir->cookie = 0;
162         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
163         if (cookie == 2)
164                 return;
165         
166         /*
167          * NFSv4 servers do not return entries for '.' and '..'
168          * Therefore, we fake these entries here.  We let '.'
169          * have cookie 0 and '..' have cookie 1.  Note that
170          * when talking to the server, we always send cookie 0
171          * instead of 1 or 2.
172          */
173         start = p = kmap_atomic(*readdir->pages, KM_USER0);
174         
175         if (cookie == 0) {
176                 *p++ = xdr_one;                                  /* next */
177                 *p++ = xdr_zero;                   /* cookie, first word */
178                 *p++ = xdr_one;                   /* cookie, second word */
179                 *p++ = xdr_one;                             /* entry len */
180                 memcpy(p, ".\0\0\0", 4);                        /* entry */
181                 p++;
182                 *p++ = xdr_one;                         /* bitmap length */
183                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
184                 *p++ = htonl(8);              /* attribute buffer length */
185                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
186         }
187         
188         *p++ = xdr_one;                                  /* next */
189         *p++ = xdr_zero;                   /* cookie, first word */
190         *p++ = xdr_two;                   /* cookie, second word */
191         *p++ = xdr_two;                             /* entry len */
192         memcpy(p, "..\0\0", 4);                         /* entry */
193         p++;
194         *p++ = xdr_one;                         /* bitmap length */
195         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
196         *p++ = htonl(8);              /* attribute buffer length */
197         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
198
199         readdir->pgbase = (char *)p - (char *)start;
200         readdir->count -= readdir->pgbase;
201         kunmap_atomic(start, KM_USER0);
202 }
203
204 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
205 {
206         int res;
207
208         might_sleep();
209
210         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
211                         nfs_wait_bit_killable, TASK_KILLABLE);
212         return res;
213 }
214
215 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
216 {
217         int res = 0;
218
219         might_sleep();
220
221         if (*timeout <= 0)
222                 *timeout = NFS4_POLL_RETRY_MIN;
223         if (*timeout > NFS4_POLL_RETRY_MAX)
224                 *timeout = NFS4_POLL_RETRY_MAX;
225         schedule_timeout_killable(*timeout);
226         if (fatal_signal_pending(current))
227                 res = -ERESTARTSYS;
228         *timeout <<= 1;
229         return res;
230 }
231
232 /* This is the error handling routine for processes that are allowed
233  * to sleep.
234  */
235 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
236 {
237         struct nfs_client *clp = server->nfs_client;
238         struct nfs4_state *state = exception->state;
239         int ret = errorcode;
240
241         exception->retry = 0;
242         switch(errorcode) {
243                 case 0:
244                         return 0;
245                 case -NFS4ERR_ADMIN_REVOKED:
246                 case -NFS4ERR_BAD_STATEID:
247                 case -NFS4ERR_OPENMODE:
248                         if (state == NULL)
249                                 break;
250                         nfs4_state_mark_reclaim_nograce(clp, state);
251                 case -NFS4ERR_STALE_CLIENTID:
252                 case -NFS4ERR_STALE_STATEID:
253                 case -NFS4ERR_EXPIRED:
254                         nfs4_schedule_state_recovery(clp);
255                         ret = nfs4_wait_clnt_recover(clp);
256                         if (ret == 0)
257                                 exception->retry = 1;
258 #if !defined(CONFIG_NFS_V4_1)
259                         break;
260 #else /* !defined(CONFIG_NFS_V4_1) */
261                         if (!nfs4_has_session(server->nfs_client))
262                                 break;
263                         /* FALLTHROUGH */
264                 case -NFS4ERR_BADSESSION:
265                 case -NFS4ERR_BADSLOT:
266                 case -NFS4ERR_BAD_HIGH_SLOT:
267                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
268                 case -NFS4ERR_DEADSESSION:
269                 case -NFS4ERR_SEQ_FALSE_RETRY:
270                 case -NFS4ERR_SEQ_MISORDERED:
271                         dprintk("%s ERROR: %d Reset session\n", __func__,
272                                 errorcode);
273                         nfs4_schedule_state_recovery(clp);
274                         exception->retry = 1;
275                         break;
276 #endif /* !defined(CONFIG_NFS_V4_1) */
277                 case -NFS4ERR_FILE_OPEN:
278                         if (exception->timeout > HZ) {
279                                 /* We have retried a decent amount, time to
280                                  * fail
281                                  */
282                                 ret = -EBUSY;
283                                 break;
284                         }
285                 case -NFS4ERR_GRACE:
286                 case -NFS4ERR_DELAY:
287                         ret = nfs4_delay(server->client, &exception->timeout);
288                         if (ret != 0)
289                                 break;
290                 case -NFS4ERR_OLD_STATEID:
291                         exception->retry = 1;
292         }
293         /* We failed to handle the error */
294         return nfs4_map_errors(ret);
295 }
296
297
298 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
299 {
300         struct nfs_client *clp = server->nfs_client;
301         spin_lock(&clp->cl_lock);
302         if (time_before(clp->cl_last_renewal,timestamp))
303                 clp->cl_last_renewal = timestamp;
304         spin_unlock(&clp->cl_lock);
305 }
306
307 #if defined(CONFIG_NFS_V4_1)
308
309 /*
310  * nfs4_free_slot - free a slot and efficiently update slot table.
311  *
312  * freeing a slot is trivially done by clearing its respective bit
313  * in the bitmap.
314  * If the freed slotid equals highest_used_slotid we want to update it
315  * so that the server would be able to size down the slot table if needed,
316  * otherwise we know that the highest_used_slotid is still in use.
317  * When updating highest_used_slotid there may be "holes" in the bitmap
318  * so we need to scan down from highest_used_slotid to 0 looking for the now
319  * highest slotid in use.
320  * If none found, highest_used_slotid is set to -1.
321  *
322  * Must be called while holding tbl->slot_tbl_lock
323  */
324 static void
325 nfs4_free_slot(struct nfs4_slot_table *tbl, u8 free_slotid)
326 {
327         int slotid = free_slotid;
328
329         /* clear used bit in bitmap */
330         __clear_bit(slotid, tbl->used_slots);
331
332         /* update highest_used_slotid when it is freed */
333         if (slotid == tbl->highest_used_slotid) {
334                 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
335                 if (slotid < tbl->max_slots)
336                         tbl->highest_used_slotid = slotid;
337                 else
338                         tbl->highest_used_slotid = -1;
339         }
340         dprintk("%s: free_slotid %u highest_used_slotid %d\n", __func__,
341                 free_slotid, tbl->highest_used_slotid);
342 }
343
344 static void nfs41_sequence_free_slot(const struct nfs_client *clp,
345                               struct nfs4_sequence_res *res)
346 {
347         struct nfs4_slot_table *tbl;
348
349         tbl = &clp->cl_session->fc_slot_table;
350         if (res->sr_slotid == NFS4_MAX_SLOT_TABLE) {
351                 /* just wake up the next guy waiting since
352                  * we may have not consumed a slot after all */
353                 dprintk("%s: No slot\n", __func__);
354                 return;
355         }
356
357         spin_lock(&tbl->slot_tbl_lock);
358         nfs4_free_slot(tbl, res->sr_slotid);
359
360         /* Signal state manager thread if session is drained */
361         if (test_bit(NFS4CLNT_SESSION_DRAINING, &clp->cl_state)) {
362                 if (tbl->highest_used_slotid == -1) {
363                         dprintk("%s COMPLETE: Session Drained\n", __func__);
364                         complete(&clp->cl_session->complete);
365                 }
366         } else
367                 rpc_wake_up_next(&tbl->slot_tbl_waitq);
368         spin_unlock(&tbl->slot_tbl_lock);
369         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
370 }
371
372 static void nfs41_sequence_done(struct nfs_client *clp,
373                                 struct nfs4_sequence_res *res,
374                                 int rpc_status)
375 {
376         unsigned long timestamp;
377         struct nfs4_slot_table *tbl;
378         struct nfs4_slot *slot;
379
380         /*
381          * sr_status remains 1 if an RPC level error occurred. The server
382          * may or may not have processed the sequence operation..
383          * Proceed as if the server received and processed the sequence
384          * operation.
385          */
386         if (res->sr_status == 1)
387                 res->sr_status = NFS_OK;
388
389         /* -ERESTARTSYS can result in skipping nfs41_sequence_setup */
390         if (res->sr_slotid == NFS4_MAX_SLOT_TABLE)
391                 goto out;
392
393         /* Check the SEQUENCE operation status */
394         if (res->sr_status == 0) {
395                 tbl = &clp->cl_session->fc_slot_table;
396                 slot = tbl->slots + res->sr_slotid;
397                 /* Update the slot's sequence and clientid lease timer */
398                 ++slot->seq_nr;
399                 timestamp = res->sr_renewal_time;
400                 spin_lock(&clp->cl_lock);
401                 if (time_before(clp->cl_last_renewal, timestamp))
402                         clp->cl_last_renewal = timestamp;
403                 spin_unlock(&clp->cl_lock);
404                 /* Check sequence flags */
405                 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
406         }
407 out:
408         /* The session may be reset by one of the error handlers. */
409         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
410         nfs41_sequence_free_slot(clp, res);
411 }
412
413 /*
414  * nfs4_find_slot - efficiently look for a free slot
415  *
416  * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
417  * If found, we mark the slot as used, update the highest_used_slotid,
418  * and respectively set up the sequence operation args.
419  * The slot number is returned if found, or NFS4_MAX_SLOT_TABLE otherwise.
420  *
421  * Note: must be called with under the slot_tbl_lock.
422  */
423 static u8
424 nfs4_find_slot(struct nfs4_slot_table *tbl, struct rpc_task *task)
425 {
426         int slotid;
427         u8 ret_id = NFS4_MAX_SLOT_TABLE;
428         BUILD_BUG_ON((u8)NFS4_MAX_SLOT_TABLE != (int)NFS4_MAX_SLOT_TABLE);
429
430         dprintk("--> %s used_slots=%04lx highest_used=%d max_slots=%d\n",
431                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
432                 tbl->max_slots);
433         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
434         if (slotid >= tbl->max_slots)
435                 goto out;
436         __set_bit(slotid, tbl->used_slots);
437         if (slotid > tbl->highest_used_slotid)
438                 tbl->highest_used_slotid = slotid;
439         ret_id = slotid;
440 out:
441         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
442                 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
443         return ret_id;
444 }
445
446 static int nfs41_setup_sequence(struct nfs4_session *session,
447                                 struct nfs4_sequence_args *args,
448                                 struct nfs4_sequence_res *res,
449                                 int cache_reply,
450                                 struct rpc_task *task)
451 {
452         struct nfs4_slot *slot;
453         struct nfs4_slot_table *tbl;
454         u8 slotid;
455
456         dprintk("--> %s\n", __func__);
457         /* slot already allocated? */
458         if (res->sr_slotid != NFS4_MAX_SLOT_TABLE)
459                 return 0;
460
461         memset(res, 0, sizeof(*res));
462         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
463         tbl = &session->fc_slot_table;
464
465         spin_lock(&tbl->slot_tbl_lock);
466         if (test_bit(NFS4CLNT_SESSION_DRAINING, &session->clp->cl_state)) {
467                 /*
468                  * The state manager will wait until the slot table is empty.
469                  * Schedule the reset thread
470                  */
471                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
472                 spin_unlock(&tbl->slot_tbl_lock);
473                 dprintk("%s Schedule Session Reset\n", __func__);
474                 return -EAGAIN;
475         }
476
477         slotid = nfs4_find_slot(tbl, task);
478         if (slotid == NFS4_MAX_SLOT_TABLE) {
479                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
480                 spin_unlock(&tbl->slot_tbl_lock);
481                 dprintk("<-- %s: no free slots\n", __func__);
482                 return -EAGAIN;
483         }
484         spin_unlock(&tbl->slot_tbl_lock);
485
486         slot = tbl->slots + slotid;
487         args->sa_session = session;
488         args->sa_slotid = slotid;
489         args->sa_cache_this = cache_reply;
490
491         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
492
493         res->sr_session = session;
494         res->sr_slotid = slotid;
495         res->sr_renewal_time = jiffies;
496         /*
497          * sr_status is only set in decode_sequence, and so will remain
498          * set to 1 if an rpc level failure occurs.
499          */
500         res->sr_status = 1;
501         return 0;
502 }
503
504 int nfs4_setup_sequence(struct nfs_client *clp,
505                         struct nfs4_sequence_args *args,
506                         struct nfs4_sequence_res *res,
507                         int cache_reply,
508                         struct rpc_task *task)
509 {
510         int ret = 0;
511
512         dprintk("--> %s clp %p session %p sr_slotid %d\n",
513                 __func__, clp, clp->cl_session, res->sr_slotid);
514
515         if (!nfs4_has_session(clp))
516                 goto out;
517         ret = nfs41_setup_sequence(clp->cl_session, args, res, cache_reply,
518                                    task);
519         if (ret && ret != -EAGAIN) {
520                 /* terminate rpc task */
521                 task->tk_status = ret;
522                 task->tk_action = NULL;
523         }
524 out:
525         dprintk("<-- %s status=%d\n", __func__, ret);
526         return ret;
527 }
528
529 struct nfs41_call_sync_data {
530         struct nfs_client *clp;
531         struct nfs4_sequence_args *seq_args;
532         struct nfs4_sequence_res *seq_res;
533         int cache_reply;
534 };
535
536 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
537 {
538         struct nfs41_call_sync_data *data = calldata;
539
540         dprintk("--> %s data->clp->cl_session %p\n", __func__,
541                 data->clp->cl_session);
542         if (nfs4_setup_sequence(data->clp, data->seq_args,
543                                 data->seq_res, data->cache_reply, task))
544                 return;
545         rpc_call_start(task);
546 }
547
548 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
549 {
550         struct nfs41_call_sync_data *data = calldata;
551
552         nfs41_sequence_done(data->clp, data->seq_res, task->tk_status);
553 }
554
555 struct rpc_call_ops nfs41_call_sync_ops = {
556         .rpc_call_prepare = nfs41_call_sync_prepare,
557         .rpc_call_done = nfs41_call_sync_done,
558 };
559
560 static int nfs4_call_sync_sequence(struct nfs_client *clp,
561                                    struct rpc_clnt *clnt,
562                                    struct rpc_message *msg,
563                                    struct nfs4_sequence_args *args,
564                                    struct nfs4_sequence_res *res,
565                                    int cache_reply)
566 {
567         int ret;
568         struct rpc_task *task;
569         struct nfs41_call_sync_data data = {
570                 .clp = clp,
571                 .seq_args = args,
572                 .seq_res = res,
573                 .cache_reply = cache_reply,
574         };
575         struct rpc_task_setup task_setup = {
576                 .rpc_client = clnt,
577                 .rpc_message = msg,
578                 .callback_ops = &nfs41_call_sync_ops,
579                 .callback_data = &data
580         };
581
582         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
583         task = rpc_run_task(&task_setup);
584         if (IS_ERR(task))
585                 ret = PTR_ERR(task);
586         else {
587                 ret = task->tk_status;
588                 rpc_put_task(task);
589         }
590         return ret;
591 }
592
593 int _nfs4_call_sync_session(struct nfs_server *server,
594                             struct rpc_message *msg,
595                             struct nfs4_sequence_args *args,
596                             struct nfs4_sequence_res *res,
597                             int cache_reply)
598 {
599         return nfs4_call_sync_sequence(server->nfs_client, server->client,
600                                        msg, args, res, cache_reply);
601 }
602
603 #endif /* CONFIG_NFS_V4_1 */
604
605 int _nfs4_call_sync(struct nfs_server *server,
606                     struct rpc_message *msg,
607                     struct nfs4_sequence_args *args,
608                     struct nfs4_sequence_res *res,
609                     int cache_reply)
610 {
611         args->sa_session = res->sr_session = NULL;
612         return rpc_call_sync(server->client, msg, 0);
613 }
614
615 #define nfs4_call_sync(server, msg, args, res, cache_reply) \
616         (server)->nfs_client->cl_call_sync((server), (msg), &(args)->seq_args, \
617                         &(res)->seq_res, (cache_reply))
618
619 static void nfs4_sequence_done(const struct nfs_server *server,
620                                struct nfs4_sequence_res *res, int rpc_status)
621 {
622 #ifdef CONFIG_NFS_V4_1
623         if (nfs4_has_session(server->nfs_client))
624                 nfs41_sequence_done(server->nfs_client, res, rpc_status);
625 #endif /* CONFIG_NFS_V4_1 */
626 }
627
628 void nfs4_restart_rpc(struct rpc_task *task, const struct nfs_client *clp)
629 {
630 #ifdef CONFIG_NFS_V4_1
631         if (nfs4_has_session(clp)) {
632                 rpc_restart_call_prepare(task);
633                 return;
634         }
635 #endif /* CONFIG_NFS_V4_1 */
636         rpc_restart_call(task);
637 }
638
639 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
640 {
641         struct nfs_inode *nfsi = NFS_I(dir);
642
643         spin_lock(&dir->i_lock);
644         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
645         if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
646                 nfs_force_lookup_revalidate(dir);
647         nfsi->change_attr = cinfo->after;
648         spin_unlock(&dir->i_lock);
649 }
650
651 struct nfs4_opendata {
652         struct kref kref;
653         struct nfs_openargs o_arg;
654         struct nfs_openres o_res;
655         struct nfs_open_confirmargs c_arg;
656         struct nfs_open_confirmres c_res;
657         struct nfs_fattr f_attr;
658         struct nfs_fattr dir_attr;
659         struct path path;
660         struct dentry *dir;
661         struct nfs4_state_owner *owner;
662         struct nfs4_state *state;
663         struct iattr attrs;
664         unsigned long timestamp;
665         unsigned int rpc_done : 1;
666         int rpc_status;
667         int cancelled;
668 };
669
670
671 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
672 {
673         p->o_res.f_attr = &p->f_attr;
674         p->o_res.dir_attr = &p->dir_attr;
675         p->o_res.seqid = p->o_arg.seqid;
676         p->c_res.seqid = p->c_arg.seqid;
677         p->o_res.server = p->o_arg.server;
678         nfs_fattr_init(&p->f_attr);
679         nfs_fattr_init(&p->dir_attr);
680         p->o_res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
681 }
682
683 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
684                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
685                 const struct iattr *attrs)
686 {
687         struct dentry *parent = dget_parent(path->dentry);
688         struct inode *dir = parent->d_inode;
689         struct nfs_server *server = NFS_SERVER(dir);
690         struct nfs4_opendata *p;
691
692         p = kzalloc(sizeof(*p), GFP_KERNEL);
693         if (p == NULL)
694                 goto err;
695         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
696         if (p->o_arg.seqid == NULL)
697                 goto err_free;
698         p->path.mnt = mntget(path->mnt);
699         p->path.dentry = dget(path->dentry);
700         p->dir = parent;
701         p->owner = sp;
702         atomic_inc(&sp->so_count);
703         p->o_arg.fh = NFS_FH(dir);
704         p->o_arg.open_flags = flags;
705         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
706         p->o_arg.clientid = server->nfs_client->cl_clientid;
707         p->o_arg.id = sp->so_owner_id.id;
708         p->o_arg.name = &p->path.dentry->d_name;
709         p->o_arg.server = server;
710         p->o_arg.bitmask = server->attr_bitmask;
711         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
712         if (flags & O_EXCL) {
713                 if (nfs4_has_persistent_session(server->nfs_client)) {
714                         /* GUARDED */
715                         p->o_arg.u.attrs = &p->attrs;
716                         memcpy(&p->attrs, attrs, sizeof(p->attrs));
717                 } else { /* EXCLUSIVE4_1 */
718                         u32 *s = (u32 *) p->o_arg.u.verifier.data;
719                         s[0] = jiffies;
720                         s[1] = current->pid;
721                 }
722         } else if (flags & O_CREAT) {
723                 p->o_arg.u.attrs = &p->attrs;
724                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
725         }
726         p->c_arg.fh = &p->o_res.fh;
727         p->c_arg.stateid = &p->o_res.stateid;
728         p->c_arg.seqid = p->o_arg.seqid;
729         nfs4_init_opendata_res(p);
730         kref_init(&p->kref);
731         return p;
732 err_free:
733         kfree(p);
734 err:
735         dput(parent);
736         return NULL;
737 }
738
739 static void nfs4_opendata_free(struct kref *kref)
740 {
741         struct nfs4_opendata *p = container_of(kref,
742                         struct nfs4_opendata, kref);
743
744         nfs_free_seqid(p->o_arg.seqid);
745         if (p->state != NULL)
746                 nfs4_put_open_state(p->state);
747         nfs4_put_state_owner(p->owner);
748         dput(p->dir);
749         path_put(&p->path);
750         kfree(p);
751 }
752
753 static void nfs4_opendata_put(struct nfs4_opendata *p)
754 {
755         if (p != NULL)
756                 kref_put(&p->kref, nfs4_opendata_free);
757 }
758
759 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
760 {
761         int ret;
762
763         ret = rpc_wait_for_completion_task(task);
764         return ret;
765 }
766
767 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
768 {
769         int ret = 0;
770
771         if (open_mode & O_EXCL)
772                 goto out;
773         switch (mode & (FMODE_READ|FMODE_WRITE)) {
774                 case FMODE_READ:
775                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0;
776                         break;
777                 case FMODE_WRITE:
778                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0;
779                         break;
780                 case FMODE_READ|FMODE_WRITE:
781                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0;
782         }
783 out:
784         return ret;
785 }
786
787 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
788 {
789         if ((delegation->type & fmode) != fmode)
790                 return 0;
791         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
792                 return 0;
793         nfs_mark_delegation_referenced(delegation);
794         return 1;
795 }
796
797 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
798 {
799         switch (fmode) {
800                 case FMODE_WRITE:
801                         state->n_wronly++;
802                         break;
803                 case FMODE_READ:
804                         state->n_rdonly++;
805                         break;
806                 case FMODE_READ|FMODE_WRITE:
807                         state->n_rdwr++;
808         }
809         nfs4_state_set_mode_locked(state, state->state | fmode);
810 }
811
812 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
813 {
814         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
815                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
816         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
817         switch (fmode) {
818                 case FMODE_READ:
819                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
820                         break;
821                 case FMODE_WRITE:
822                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
823                         break;
824                 case FMODE_READ|FMODE_WRITE:
825                         set_bit(NFS_O_RDWR_STATE, &state->flags);
826         }
827 }
828
829 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
830 {
831         write_seqlock(&state->seqlock);
832         nfs_set_open_stateid_locked(state, stateid, fmode);
833         write_sequnlock(&state->seqlock);
834 }
835
836 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
837 {
838         /*
839          * Protect the call to nfs4_state_set_mode_locked and
840          * serialise the stateid update
841          */
842         write_seqlock(&state->seqlock);
843         if (deleg_stateid != NULL) {
844                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
845                 set_bit(NFS_DELEGATED_STATE, &state->flags);
846         }
847         if (open_stateid != NULL)
848                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
849         write_sequnlock(&state->seqlock);
850         spin_lock(&state->owner->so_lock);
851         update_open_stateflags(state, fmode);
852         spin_unlock(&state->owner->so_lock);
853 }
854
855 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
856 {
857         struct nfs_inode *nfsi = NFS_I(state->inode);
858         struct nfs_delegation *deleg_cur;
859         int ret = 0;
860
861         fmode &= (FMODE_READ|FMODE_WRITE);
862
863         rcu_read_lock();
864         deleg_cur = rcu_dereference(nfsi->delegation);
865         if (deleg_cur == NULL)
866                 goto no_delegation;
867
868         spin_lock(&deleg_cur->lock);
869         if (nfsi->delegation != deleg_cur ||
870             (deleg_cur->type & fmode) != fmode)
871                 goto no_delegation_unlock;
872
873         if (delegation == NULL)
874                 delegation = &deleg_cur->stateid;
875         else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
876                 goto no_delegation_unlock;
877
878         nfs_mark_delegation_referenced(deleg_cur);
879         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
880         ret = 1;
881 no_delegation_unlock:
882         spin_unlock(&deleg_cur->lock);
883 no_delegation:
884         rcu_read_unlock();
885
886         if (!ret && open_stateid != NULL) {
887                 __update_open_stateid(state, open_stateid, NULL, fmode);
888                 ret = 1;
889         }
890
891         return ret;
892 }
893
894
895 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
896 {
897         struct nfs_delegation *delegation;
898
899         rcu_read_lock();
900         delegation = rcu_dereference(NFS_I(inode)->delegation);
901         if (delegation == NULL || (delegation->type & fmode) == fmode) {
902                 rcu_read_unlock();
903                 return;
904         }
905         rcu_read_unlock();
906         nfs_inode_return_delegation(inode);
907 }
908
909 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
910 {
911         struct nfs4_state *state = opendata->state;
912         struct nfs_inode *nfsi = NFS_I(state->inode);
913         struct nfs_delegation *delegation;
914         int open_mode = opendata->o_arg.open_flags & O_EXCL;
915         fmode_t fmode = opendata->o_arg.fmode;
916         nfs4_stateid stateid;
917         int ret = -EAGAIN;
918
919         for (;;) {
920                 if (can_open_cached(state, fmode, open_mode)) {
921                         spin_lock(&state->owner->so_lock);
922                         if (can_open_cached(state, fmode, open_mode)) {
923                                 update_open_stateflags(state, fmode);
924                                 spin_unlock(&state->owner->so_lock);
925                                 goto out_return_state;
926                         }
927                         spin_unlock(&state->owner->so_lock);
928                 }
929                 rcu_read_lock();
930                 delegation = rcu_dereference(nfsi->delegation);
931                 if (delegation == NULL ||
932                     !can_open_delegated(delegation, fmode)) {
933                         rcu_read_unlock();
934                         break;
935                 }
936                 /* Save the delegation */
937                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
938                 rcu_read_unlock();
939                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
940                 if (ret != 0)
941                         goto out;
942                 ret = -EAGAIN;
943
944                 /* Try to update the stateid using the delegation */
945                 if (update_open_stateid(state, NULL, &stateid, fmode))
946                         goto out_return_state;
947         }
948 out:
949         return ERR_PTR(ret);
950 out_return_state:
951         atomic_inc(&state->count);
952         return state;
953 }
954
955 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
956 {
957         struct inode *inode;
958         struct nfs4_state *state = NULL;
959         struct nfs_delegation *delegation;
960         int ret;
961
962         if (!data->rpc_done) {
963                 state = nfs4_try_open_cached(data);
964                 goto out;
965         }
966
967         ret = -EAGAIN;
968         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
969                 goto err;
970         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
971         ret = PTR_ERR(inode);
972         if (IS_ERR(inode))
973                 goto err;
974         ret = -ENOMEM;
975         state = nfs4_get_open_state(inode, data->owner);
976         if (state == NULL)
977                 goto err_put_inode;
978         if (data->o_res.delegation_type != 0) {
979                 int delegation_flags = 0;
980
981                 rcu_read_lock();
982                 delegation = rcu_dereference(NFS_I(inode)->delegation);
983                 if (delegation)
984                         delegation_flags = delegation->flags;
985                 rcu_read_unlock();
986                 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
987                         nfs_inode_set_delegation(state->inode,
988                                         data->owner->so_cred,
989                                         &data->o_res);
990                 else
991                         nfs_inode_reclaim_delegation(state->inode,
992                                         data->owner->so_cred,
993                                         &data->o_res);
994         }
995
996         update_open_stateid(state, &data->o_res.stateid, NULL,
997                         data->o_arg.fmode);
998         iput(inode);
999 out:
1000         return state;
1001 err_put_inode:
1002         iput(inode);
1003 err:
1004         return ERR_PTR(ret);
1005 }
1006
1007 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1008 {
1009         struct nfs_inode *nfsi = NFS_I(state->inode);
1010         struct nfs_open_context *ctx;
1011
1012         spin_lock(&state->inode->i_lock);
1013         list_for_each_entry(ctx, &nfsi->open_files, list) {
1014                 if (ctx->state != state)
1015                         continue;
1016                 get_nfs_open_context(ctx);
1017                 spin_unlock(&state->inode->i_lock);
1018                 return ctx;
1019         }
1020         spin_unlock(&state->inode->i_lock);
1021         return ERR_PTR(-ENOENT);
1022 }
1023
1024 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1025 {
1026         struct nfs4_opendata *opendata;
1027
1028         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, 0, NULL);
1029         if (opendata == NULL)
1030                 return ERR_PTR(-ENOMEM);
1031         opendata->state = state;
1032         atomic_inc(&state->count);
1033         return opendata;
1034 }
1035
1036 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1037 {
1038         struct nfs4_state *newstate;
1039         int ret;
1040
1041         opendata->o_arg.open_flags = 0;
1042         opendata->o_arg.fmode = fmode;
1043         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1044         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1045         nfs4_init_opendata_res(opendata);
1046         ret = _nfs4_proc_open(opendata);
1047         if (ret != 0)
1048                 return ret; 
1049         newstate = nfs4_opendata_to_nfs4_state(opendata);
1050         if (IS_ERR(newstate))
1051                 return PTR_ERR(newstate);
1052         nfs4_close_state(&opendata->path, newstate, fmode);
1053         *res = newstate;
1054         return 0;
1055 }
1056
1057 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1058 {
1059         struct nfs4_state *newstate;
1060         int ret;
1061
1062         /* memory barrier prior to reading state->n_* */
1063         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1064         smp_rmb();
1065         if (state->n_rdwr != 0) {
1066                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1067                 if (ret != 0)
1068                         return ret;
1069                 if (newstate != state)
1070                         return -ESTALE;
1071         }
1072         if (state->n_wronly != 0) {
1073                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1074                 if (ret != 0)
1075                         return ret;
1076                 if (newstate != state)
1077                         return -ESTALE;
1078         }
1079         if (state->n_rdonly != 0) {
1080                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1081                 if (ret != 0)
1082                         return ret;
1083                 if (newstate != state)
1084                         return -ESTALE;
1085         }
1086         /*
1087          * We may have performed cached opens for all three recoveries.
1088          * Check if we need to update the current stateid.
1089          */
1090         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1091             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
1092                 write_seqlock(&state->seqlock);
1093                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1094                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
1095                 write_sequnlock(&state->seqlock);
1096         }
1097         return 0;
1098 }
1099
1100 /*
1101  * OPEN_RECLAIM:
1102  *      reclaim state on the server after a reboot.
1103  */
1104 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1105 {
1106         struct nfs_delegation *delegation;
1107         struct nfs4_opendata *opendata;
1108         fmode_t delegation_type = 0;
1109         int status;
1110
1111         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1112         if (IS_ERR(opendata))
1113                 return PTR_ERR(opendata);
1114         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1115         opendata->o_arg.fh = NFS_FH(state->inode);
1116         rcu_read_lock();
1117         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1118         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1119                 delegation_type = delegation->type;
1120         rcu_read_unlock();
1121         opendata->o_arg.u.delegation_type = delegation_type;
1122         status = nfs4_open_recover(opendata, state);
1123         nfs4_opendata_put(opendata);
1124         return status;
1125 }
1126
1127 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1128 {
1129         struct nfs_server *server = NFS_SERVER(state->inode);
1130         struct nfs4_exception exception = { };
1131         int err;
1132         do {
1133                 err = _nfs4_do_open_reclaim(ctx, state);
1134                 if (err != -NFS4ERR_DELAY)
1135                         break;
1136                 nfs4_handle_exception(server, err, &exception);
1137         } while (exception.retry);
1138         return err;
1139 }
1140
1141 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1142 {
1143         struct nfs_open_context *ctx;
1144         int ret;
1145
1146         ctx = nfs4_state_find_open_context(state);
1147         if (IS_ERR(ctx))
1148                 return PTR_ERR(ctx);
1149         ret = nfs4_do_open_reclaim(ctx, state);
1150         put_nfs_open_context(ctx);
1151         return ret;
1152 }
1153
1154 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1155 {
1156         struct nfs4_opendata *opendata;
1157         int ret;
1158
1159         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1160         if (IS_ERR(opendata))
1161                 return PTR_ERR(opendata);
1162         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1163         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
1164                         sizeof(opendata->o_arg.u.delegation.data));
1165         ret = nfs4_open_recover(opendata, state);
1166         nfs4_opendata_put(opendata);
1167         return ret;
1168 }
1169
1170 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1171 {
1172         struct nfs4_exception exception = { };
1173         struct nfs_server *server = NFS_SERVER(state->inode);
1174         int err;
1175         do {
1176                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1177                 switch (err) {
1178                         case 0:
1179                         case -ENOENT:
1180                         case -ESTALE:
1181                                 goto out;
1182                         case -NFS4ERR_STALE_CLIENTID:
1183                         case -NFS4ERR_STALE_STATEID:
1184                         case -NFS4ERR_EXPIRED:
1185                                 /* Don't recall a delegation if it was lost */
1186                                 nfs4_schedule_state_recovery(server->nfs_client);
1187                                 goto out;
1188                         case -ERESTARTSYS:
1189                                 /*
1190                                  * The show must go on: exit, but mark the
1191                                  * stateid as needing recovery.
1192                                  */
1193                         case -NFS4ERR_ADMIN_REVOKED:
1194                         case -NFS4ERR_BAD_STATEID:
1195                                 nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
1196                         case -ENOMEM:
1197                                 err = 0;
1198                                 goto out;
1199                 }
1200                 err = nfs4_handle_exception(server, err, &exception);
1201         } while (exception.retry);
1202 out:
1203         return err;
1204 }
1205
1206 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1207 {
1208         struct nfs4_opendata *data = calldata;
1209
1210         data->rpc_status = task->tk_status;
1211         if (RPC_ASSASSINATED(task))
1212                 return;
1213         if (data->rpc_status == 0) {
1214                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
1215                                 sizeof(data->o_res.stateid.data));
1216                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1217                 renew_lease(data->o_res.server, data->timestamp);
1218                 data->rpc_done = 1;
1219         }
1220 }
1221
1222 static void nfs4_open_confirm_release(void *calldata)
1223 {
1224         struct nfs4_opendata *data = calldata;
1225         struct nfs4_state *state = NULL;
1226
1227         /* If this request hasn't been cancelled, do nothing */
1228         if (data->cancelled == 0)
1229                 goto out_free;
1230         /* In case of error, no cleanup! */
1231         if (!data->rpc_done)
1232                 goto out_free;
1233         state = nfs4_opendata_to_nfs4_state(data);
1234         if (!IS_ERR(state))
1235                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1236 out_free:
1237         nfs4_opendata_put(data);
1238 }
1239
1240 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1241         .rpc_call_done = nfs4_open_confirm_done,
1242         .rpc_release = nfs4_open_confirm_release,
1243 };
1244
1245 /*
1246  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1247  */
1248 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1249 {
1250         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1251         struct rpc_task *task;
1252         struct  rpc_message msg = {
1253                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1254                 .rpc_argp = &data->c_arg,
1255                 .rpc_resp = &data->c_res,
1256                 .rpc_cred = data->owner->so_cred,
1257         };
1258         struct rpc_task_setup task_setup_data = {
1259                 .rpc_client = server->client,
1260                 .rpc_message = &msg,
1261                 .callback_ops = &nfs4_open_confirm_ops,
1262                 .callback_data = data,
1263                 .workqueue = nfsiod_workqueue,
1264                 .flags = RPC_TASK_ASYNC,
1265         };
1266         int status;
1267
1268         kref_get(&data->kref);
1269         data->rpc_done = 0;
1270         data->rpc_status = 0;
1271         data->timestamp = jiffies;
1272         task = rpc_run_task(&task_setup_data);
1273         if (IS_ERR(task))
1274                 return PTR_ERR(task);
1275         status = nfs4_wait_for_completion_rpc_task(task);
1276         if (status != 0) {
1277                 data->cancelled = 1;
1278                 smp_wmb();
1279         } else
1280                 status = data->rpc_status;
1281         rpc_put_task(task);
1282         return status;
1283 }
1284
1285 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1286 {
1287         struct nfs4_opendata *data = calldata;
1288         struct nfs4_state_owner *sp = data->owner;
1289
1290         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1291                 return;
1292         /*
1293          * Check if we still need to send an OPEN call, or if we can use
1294          * a delegation instead.
1295          */
1296         if (data->state != NULL) {
1297                 struct nfs_delegation *delegation;
1298
1299                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1300                         goto out_no_action;
1301                 rcu_read_lock();
1302                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1303                 if (delegation != NULL &&
1304                     test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) {
1305                         rcu_read_unlock();
1306                         goto out_no_action;
1307                 }
1308                 rcu_read_unlock();
1309         }
1310         /* Update sequence id. */
1311         data->o_arg.id = sp->so_owner_id.id;
1312         data->o_arg.clientid = sp->so_client->cl_clientid;
1313         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1314                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1315                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1316         }
1317         data->timestamp = jiffies;
1318         if (nfs4_setup_sequence(data->o_arg.server->nfs_client,
1319                                 &data->o_arg.seq_args,
1320                                 &data->o_res.seq_res, 1, task))
1321                 return;
1322         rpc_call_start(task);
1323         return;
1324 out_no_action:
1325         task->tk_action = NULL;
1326
1327 }
1328
1329 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1330 {
1331         struct nfs4_opendata *data = calldata;
1332
1333         data->rpc_status = task->tk_status;
1334
1335         nfs4_sequence_done(data->o_arg.server, &data->o_res.seq_res,
1336                         task->tk_status);
1337
1338         if (RPC_ASSASSINATED(task))
1339                 return;
1340         if (task->tk_status == 0) {
1341                 switch (data->o_res.f_attr->mode & S_IFMT) {
1342                         case S_IFREG:
1343                                 break;
1344                         case S_IFLNK:
1345                                 data->rpc_status = -ELOOP;
1346                                 break;
1347                         case S_IFDIR:
1348                                 data->rpc_status = -EISDIR;
1349                                 break;
1350                         default:
1351                                 data->rpc_status = -ENOTDIR;
1352                 }
1353                 renew_lease(data->o_res.server, data->timestamp);
1354                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1355                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1356         }
1357         data->rpc_done = 1;
1358 }
1359
1360 static void nfs4_open_release(void *calldata)
1361 {
1362         struct nfs4_opendata *data = calldata;
1363         struct nfs4_state *state = NULL;
1364
1365         /* If this request hasn't been cancelled, do nothing */
1366         if (data->cancelled == 0)
1367                 goto out_free;
1368         /* In case of error, no cleanup! */
1369         if (data->rpc_status != 0 || !data->rpc_done)
1370                 goto out_free;
1371         /* In case we need an open_confirm, no cleanup! */
1372         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1373                 goto out_free;
1374         state = nfs4_opendata_to_nfs4_state(data);
1375         if (!IS_ERR(state))
1376                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1377 out_free:
1378         nfs4_opendata_put(data);
1379 }
1380
1381 static const struct rpc_call_ops nfs4_open_ops = {
1382         .rpc_call_prepare = nfs4_open_prepare,
1383         .rpc_call_done = nfs4_open_done,
1384         .rpc_release = nfs4_open_release,
1385 };
1386
1387 /*
1388  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1389  */
1390 static int _nfs4_proc_open(struct nfs4_opendata *data)
1391 {
1392         struct inode *dir = data->dir->d_inode;
1393         struct nfs_server *server = NFS_SERVER(dir);
1394         struct nfs_openargs *o_arg = &data->o_arg;
1395         struct nfs_openres *o_res = &data->o_res;
1396         struct rpc_task *task;
1397         struct rpc_message msg = {
1398                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1399                 .rpc_argp = o_arg,
1400                 .rpc_resp = o_res,
1401                 .rpc_cred = data->owner->so_cred,
1402         };
1403         struct rpc_task_setup task_setup_data = {
1404                 .rpc_client = server->client,
1405                 .rpc_message = &msg,
1406                 .callback_ops = &nfs4_open_ops,
1407                 .callback_data = data,
1408                 .workqueue = nfsiod_workqueue,
1409                 .flags = RPC_TASK_ASYNC,
1410         };
1411         int status;
1412
1413         kref_get(&data->kref);
1414         data->rpc_done = 0;
1415         data->rpc_status = 0;
1416         data->cancelled = 0;
1417         task = rpc_run_task(&task_setup_data);
1418         if (IS_ERR(task))
1419                 return PTR_ERR(task);
1420         status = nfs4_wait_for_completion_rpc_task(task);
1421         if (status != 0) {
1422                 data->cancelled = 1;
1423                 smp_wmb();
1424         } else
1425                 status = data->rpc_status;
1426         rpc_put_task(task);
1427         if (status != 0 || !data->rpc_done)
1428                 return status;
1429
1430         if (o_res->fh.size == 0)
1431                 _nfs4_proc_lookup(dir, o_arg->name, &o_res->fh, o_res->f_attr);
1432
1433         if (o_arg->open_flags & O_CREAT) {
1434                 update_changeattr(dir, &o_res->cinfo);
1435                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1436         } else
1437                 nfs_refresh_inode(dir, o_res->dir_attr);
1438         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1439                 status = _nfs4_proc_open_confirm(data);
1440                 if (status != 0)
1441                         return status;
1442         }
1443         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1444                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1445         return 0;
1446 }
1447
1448 static int nfs4_recover_expired_lease(struct nfs_server *server)
1449 {
1450         struct nfs_client *clp = server->nfs_client;
1451         unsigned int loop;
1452         int ret;
1453
1454         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1455                 ret = nfs4_wait_clnt_recover(clp);
1456                 if (ret != 0)
1457                         break;
1458                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1459                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1460                         break;
1461                 nfs4_schedule_state_recovery(clp);
1462                 ret = -EIO;
1463         }
1464         return ret;
1465 }
1466
1467 /*
1468  * OPEN_EXPIRED:
1469  *      reclaim state on the server after a network partition.
1470  *      Assumes caller holds the appropriate lock
1471  */
1472 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1473 {
1474         struct nfs4_opendata *opendata;
1475         int ret;
1476
1477         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1478         if (IS_ERR(opendata))
1479                 return PTR_ERR(opendata);
1480         ret = nfs4_open_recover(opendata, state);
1481         if (ret == -ESTALE)
1482                 d_drop(ctx->path.dentry);
1483         nfs4_opendata_put(opendata);
1484         return ret;
1485 }
1486
1487 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1488 {
1489         struct nfs_server *server = NFS_SERVER(state->inode);
1490         struct nfs4_exception exception = { };
1491         int err;
1492
1493         do {
1494                 err = _nfs4_open_expired(ctx, state);
1495                 switch (err) {
1496                 default:
1497                         goto out;
1498                 case -NFS4ERR_GRACE:
1499                 case -NFS4ERR_DELAY:
1500                         nfs4_handle_exception(server, err, &exception);
1501                         err = 0;
1502                 }
1503         } while (exception.retry);
1504 out:
1505         return err;
1506 }
1507
1508 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1509 {
1510         struct nfs_open_context *ctx;
1511         int ret;
1512
1513         ctx = nfs4_state_find_open_context(state);
1514         if (IS_ERR(ctx))
1515                 return PTR_ERR(ctx);
1516         ret = nfs4_do_open_expired(ctx, state);
1517         put_nfs_open_context(ctx);
1518         return ret;
1519 }
1520
1521 /*
1522  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1523  * fields corresponding to attributes that were used to store the verifier.
1524  * Make sure we clobber those fields in the later setattr call
1525  */
1526 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1527 {
1528         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1529             !(sattr->ia_valid & ATTR_ATIME_SET))
1530                 sattr->ia_valid |= ATTR_ATIME;
1531
1532         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1533             !(sattr->ia_valid & ATTR_MTIME_SET))
1534                 sattr->ia_valid |= ATTR_MTIME;
1535 }
1536
1537 /*
1538  * Returns a referenced nfs4_state
1539  */
1540 static int _nfs4_do_open(struct inode *dir, struct path *path, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
1541 {
1542         struct nfs4_state_owner  *sp;
1543         struct nfs4_state     *state = NULL;
1544         struct nfs_server       *server = NFS_SERVER(dir);
1545         struct nfs4_opendata *opendata;
1546         int status;
1547
1548         /* Protect against reboot recovery conflicts */
1549         status = -ENOMEM;
1550         if (!(sp = nfs4_get_state_owner(server, cred))) {
1551                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1552                 goto out_err;
1553         }
1554         status = nfs4_recover_expired_lease(server);
1555         if (status != 0)
1556                 goto err_put_state_owner;
1557         if (path->dentry->d_inode != NULL)
1558                 nfs4_return_incompatible_delegation(path->dentry->d_inode, fmode);
1559         status = -ENOMEM;
1560         opendata = nfs4_opendata_alloc(path, sp, fmode, flags, sattr);
1561         if (opendata == NULL)
1562                 goto err_put_state_owner;
1563
1564         if (path->dentry->d_inode != NULL)
1565                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1566
1567         status = _nfs4_proc_open(opendata);
1568         if (status != 0)
1569                 goto err_opendata_put;
1570
1571         if (opendata->o_arg.open_flags & O_EXCL)
1572                 nfs4_exclusive_attrset(opendata, sattr);
1573
1574         state = nfs4_opendata_to_nfs4_state(opendata);
1575         status = PTR_ERR(state);
1576         if (IS_ERR(state))
1577                 goto err_opendata_put;
1578         nfs4_opendata_put(opendata);
1579         nfs4_put_state_owner(sp);
1580         *res = state;
1581         return 0;
1582 err_opendata_put:
1583         nfs4_opendata_put(opendata);
1584 err_put_state_owner:
1585         nfs4_put_state_owner(sp);
1586 out_err:
1587         *res = NULL;
1588         return status;
1589 }
1590
1591
1592 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct path *path, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred)
1593 {
1594         struct nfs4_exception exception = { };
1595         struct nfs4_state *res;
1596         int status;
1597
1598         do {
1599                 status = _nfs4_do_open(dir, path, fmode, flags, sattr, cred, &res);
1600                 if (status == 0)
1601                         break;
1602                 /* NOTE: BAD_SEQID means the server and client disagree about the
1603                  * book-keeping w.r.t. state-changing operations
1604                  * (OPEN/CLOSE/LOCK/LOCKU...)
1605                  * It is actually a sign of a bug on the client or on the server.
1606                  *
1607                  * If we receive a BAD_SEQID error in the particular case of
1608                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1609                  * have unhashed the old state_owner for us, and that we can
1610                  * therefore safely retry using a new one. We should still warn
1611                  * the user though...
1612                  */
1613                 if (status == -NFS4ERR_BAD_SEQID) {
1614                         printk(KERN_WARNING "NFS: v4 server %s "
1615                                         " returned a bad sequence-id error!\n",
1616                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1617                         exception.retry = 1;
1618                         continue;
1619                 }
1620                 /*
1621                  * BAD_STATEID on OPEN means that the server cancelled our
1622                  * state before it received the OPEN_CONFIRM.
1623                  * Recover by retrying the request as per the discussion
1624                  * on Page 181 of RFC3530.
1625                  */
1626                 if (status == -NFS4ERR_BAD_STATEID) {
1627                         exception.retry = 1;
1628                         continue;
1629                 }
1630                 if (status == -EAGAIN) {
1631                         /* We must have found a delegation */
1632                         exception.retry = 1;
1633                         continue;
1634                 }
1635                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1636                                         status, &exception));
1637         } while (exception.retry);
1638         return res;
1639 }
1640
1641 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1642                             struct nfs_fattr *fattr, struct iattr *sattr,
1643                             struct nfs4_state *state)
1644 {
1645         struct nfs_server *server = NFS_SERVER(inode);
1646         struct nfs_setattrargs  arg = {
1647                 .fh             = NFS_FH(inode),
1648                 .iap            = sattr,
1649                 .server         = server,
1650                 .bitmask = server->attr_bitmask,
1651         };
1652         struct nfs_setattrres  res = {
1653                 .fattr          = fattr,
1654                 .server         = server,
1655         };
1656         struct rpc_message msg = {
1657                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1658                 .rpc_argp       = &arg,
1659                 .rpc_resp       = &res,
1660                 .rpc_cred       = cred,
1661         };
1662         unsigned long timestamp = jiffies;
1663         int status;
1664
1665         nfs_fattr_init(fattr);
1666
1667         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1668                 /* Use that stateid */
1669         } else if (state != NULL) {
1670                 nfs4_copy_stateid(&arg.stateid, state, current->files);
1671         } else
1672                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1673
1674         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
1675         if (status == 0 && state != NULL)
1676                 renew_lease(server, timestamp);
1677         return status;
1678 }
1679
1680 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1681                            struct nfs_fattr *fattr, struct iattr *sattr,
1682                            struct nfs4_state *state)
1683 {
1684         struct nfs_server *server = NFS_SERVER(inode);
1685         struct nfs4_exception exception = { };
1686         int err;
1687         do {
1688                 err = nfs4_handle_exception(server,
1689                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1690                                 &exception);
1691         } while (exception.retry);
1692         return err;
1693 }
1694
1695 struct nfs4_closedata {
1696         struct path path;
1697         struct inode *inode;
1698         struct nfs4_state *state;
1699         struct nfs_closeargs arg;
1700         struct nfs_closeres res;
1701         struct nfs_fattr fattr;
1702         unsigned long timestamp;
1703 };
1704
1705 static void nfs4_free_closedata(void *data)
1706 {
1707         struct nfs4_closedata *calldata = data;
1708         struct nfs4_state_owner *sp = calldata->state->owner;
1709
1710         nfs4_put_open_state(calldata->state);
1711         nfs_free_seqid(calldata->arg.seqid);
1712         nfs4_put_state_owner(sp);
1713         path_put(&calldata->path);
1714         kfree(calldata);
1715 }
1716
1717 static void nfs4_close_done(struct rpc_task *task, void *data)
1718 {
1719         struct nfs4_closedata *calldata = data;
1720         struct nfs4_state *state = calldata->state;
1721         struct nfs_server *server = NFS_SERVER(calldata->inode);
1722
1723         nfs4_sequence_done(server, &calldata->res.seq_res, task->tk_status);
1724         if (RPC_ASSASSINATED(task))
1725                 return;
1726         /* hmm. we are done with the inode, and in the process of freeing
1727          * the state_owner. we keep this around to process errors
1728          */
1729         switch (task->tk_status) {
1730                 case 0:
1731                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1732                         renew_lease(server, calldata->timestamp);
1733                         break;
1734                 case -NFS4ERR_STALE_STATEID:
1735                 case -NFS4ERR_OLD_STATEID:
1736                 case -NFS4ERR_BAD_STATEID:
1737                 case -NFS4ERR_EXPIRED:
1738                         if (calldata->arg.fmode == 0)
1739                                 break;
1740                 default:
1741                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN) {
1742                                 nfs4_restart_rpc(task, server->nfs_client);
1743                                 return;
1744                         }
1745         }
1746         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1747 }
1748
1749 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1750 {
1751         struct nfs4_closedata *calldata = data;
1752         struct nfs4_state *state = calldata->state;
1753         int clear_rd, clear_wr, clear_rdwr;
1754
1755         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1756                 return;
1757
1758         clear_rd = clear_wr = clear_rdwr = 0;
1759         spin_lock(&state->owner->so_lock);
1760         /* Calculate the change in open mode */
1761         if (state->n_rdwr == 0) {
1762                 if (state->n_rdonly == 0) {
1763                         clear_rd |= test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1764                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1765                 }
1766                 if (state->n_wronly == 0) {
1767                         clear_wr |= test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1768                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1769                 }
1770         }
1771         spin_unlock(&state->owner->so_lock);
1772         if (!clear_rd && !clear_wr && !clear_rdwr) {
1773                 /* Note: exit _without_ calling nfs4_close_done */
1774                 task->tk_action = NULL;
1775                 return;
1776         }
1777         nfs_fattr_init(calldata->res.fattr);
1778         if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0) {
1779                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1780                 calldata->arg.fmode = FMODE_READ;
1781         } else if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0) {
1782                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1783                 calldata->arg.fmode = FMODE_WRITE;
1784         }
1785         calldata->timestamp = jiffies;
1786         if (nfs4_setup_sequence((NFS_SERVER(calldata->inode))->nfs_client,
1787                                 &calldata->arg.seq_args, &calldata->res.seq_res,
1788                                 1, task))
1789                 return;
1790         rpc_call_start(task);
1791 }
1792
1793 static const struct rpc_call_ops nfs4_close_ops = {
1794         .rpc_call_prepare = nfs4_close_prepare,
1795         .rpc_call_done = nfs4_close_done,
1796         .rpc_release = nfs4_free_closedata,
1797 };
1798
1799 /* 
1800  * It is possible for data to be read/written from a mem-mapped file 
1801  * after the sys_close call (which hits the vfs layer as a flush).
1802  * This means that we can't safely call nfsv4 close on a file until 
1803  * the inode is cleared. This in turn means that we are not good
1804  * NFSv4 citizens - we do not indicate to the server to update the file's 
1805  * share state even when we are done with one of the three share 
1806  * stateid's in the inode.
1807  *
1808  * NOTE: Caller must be holding the sp->so_owner semaphore!
1809  */
1810 int nfs4_do_close(struct path *path, struct nfs4_state *state, int wait)
1811 {
1812         struct nfs_server *server = NFS_SERVER(state->inode);
1813         struct nfs4_closedata *calldata;
1814         struct nfs4_state_owner *sp = state->owner;
1815         struct rpc_task *task;
1816         struct rpc_message msg = {
1817                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1818                 .rpc_cred = state->owner->so_cred,
1819         };
1820         struct rpc_task_setup task_setup_data = {
1821                 .rpc_client = server->client,
1822                 .rpc_message = &msg,
1823                 .callback_ops = &nfs4_close_ops,
1824                 .workqueue = nfsiod_workqueue,
1825                 .flags = RPC_TASK_ASYNC,
1826         };
1827         int status = -ENOMEM;
1828
1829         calldata = kzalloc(sizeof(*calldata), GFP_KERNEL);
1830         if (calldata == NULL)
1831                 goto out;
1832         calldata->inode = state->inode;
1833         calldata->state = state;
1834         calldata->arg.fh = NFS_FH(state->inode);
1835         calldata->arg.stateid = &state->open_stateid;
1836         if (nfs4_has_session(server->nfs_client))
1837                 memset(calldata->arg.stateid->data, 0, 4);    /* clear seqid */
1838         /* Serialization for the sequence id */
1839         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1840         if (calldata->arg.seqid == NULL)
1841                 goto out_free_calldata;
1842         calldata->arg.fmode = 0;
1843         calldata->arg.bitmask = server->cache_consistency_bitmask;
1844         calldata->res.fattr = &calldata->fattr;
1845         calldata->res.seqid = calldata->arg.seqid;
1846         calldata->res.server = server;
1847         calldata->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
1848         calldata->path.mnt = mntget(path->mnt);
1849         calldata->path.dentry = dget(path->dentry);
1850
1851         msg.rpc_argp = &calldata->arg,
1852         msg.rpc_resp = &calldata->res,
1853         task_setup_data.callback_data = calldata;
1854         task = rpc_run_task(&task_setup_data);
1855         if (IS_ERR(task))
1856                 return PTR_ERR(task);
1857         status = 0;
1858         if (wait)
1859                 status = rpc_wait_for_completion_task(task);
1860         rpc_put_task(task);
1861         return status;
1862 out_free_calldata:
1863         kfree(calldata);
1864 out:
1865         nfs4_put_open_state(state);
1866         nfs4_put_state_owner(sp);
1867         return status;
1868 }
1869
1870 static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state, fmode_t fmode)
1871 {
1872         struct file *filp;
1873         int ret;
1874
1875         /* If the open_intent is for execute, we have an extra check to make */
1876         if (fmode & FMODE_EXEC) {
1877                 ret = nfs_may_open(state->inode,
1878                                 state->owner->so_cred,
1879                                 nd->intent.open.flags);
1880                 if (ret < 0)
1881                         goto out_close;
1882         }
1883         filp = lookup_instantiate_filp(nd, path->dentry, NULL);
1884         if (!IS_ERR(filp)) {
1885                 struct nfs_open_context *ctx;
1886                 ctx = nfs_file_open_context(filp);
1887                 ctx->state = state;
1888                 return 0;
1889         }
1890         ret = PTR_ERR(filp);
1891 out_close:
1892         nfs4_close_sync(path, state, fmode & (FMODE_READ|FMODE_WRITE));
1893         return ret;
1894 }
1895
1896 struct dentry *
1897 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1898 {
1899         struct path path = {
1900                 .mnt = nd->path.mnt,
1901                 .dentry = dentry,
1902         };
1903         struct dentry *parent;
1904         struct iattr attr;
1905         struct rpc_cred *cred;
1906         struct nfs4_state *state;
1907         struct dentry *res;
1908         fmode_t fmode = nd->intent.open.flags & (FMODE_READ | FMODE_WRITE | FMODE_EXEC);
1909
1910         if (nd->flags & LOOKUP_CREATE) {
1911                 attr.ia_mode = nd->intent.open.create_mode;
1912                 attr.ia_valid = ATTR_MODE;
1913                 if (!IS_POSIXACL(dir))
1914                         attr.ia_mode &= ~current_umask();
1915         } else {
1916                 attr.ia_valid = 0;
1917                 BUG_ON(nd->intent.open.flags & O_CREAT);
1918         }
1919
1920         cred = rpc_lookup_cred();
1921         if (IS_ERR(cred))
1922                 return (struct dentry *)cred;
1923         parent = dentry->d_parent;
1924         /* Protect against concurrent sillydeletes */
1925         nfs_block_sillyrename(parent);
1926         state = nfs4_do_open(dir, &path, fmode, nd->intent.open.flags, &attr, cred);
1927         put_rpccred(cred);
1928         if (IS_ERR(state)) {
1929                 if (PTR_ERR(state) == -ENOENT) {
1930                         d_add(dentry, NULL);
1931                         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1932                 }
1933                 nfs_unblock_sillyrename(parent);
1934                 return (struct dentry *)state;
1935         }
1936         res = d_add_unique(dentry, igrab(state->inode));
1937         if (res != NULL)
1938                 path.dentry = res;
1939         nfs_set_verifier(path.dentry, nfs_save_change_attribute(dir));
1940         nfs_unblock_sillyrename(parent);
1941         nfs4_intent_set_file(nd, &path, state, fmode);
1942         return res;
1943 }
1944
1945 int
1946 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1947 {
1948         struct path path = {
1949                 .mnt = nd->path.mnt,
1950                 .dentry = dentry,
1951         };
1952         struct rpc_cred *cred;
1953         struct nfs4_state *state;
1954         fmode_t fmode = openflags & (FMODE_READ | FMODE_WRITE);
1955
1956         cred = rpc_lookup_cred();
1957         if (IS_ERR(cred))
1958                 return PTR_ERR(cred);
1959         state = nfs4_do_open(dir, &path, fmode, openflags, NULL, cred);
1960         put_rpccred(cred);
1961         if (IS_ERR(state)) {
1962                 switch (PTR_ERR(state)) {
1963                         case -EPERM:
1964                         case -EACCES:
1965                         case -EDQUOT:
1966                         case -ENOSPC:
1967                         case -EROFS:
1968                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1969                                 return 1;
1970                         default:
1971                                 goto out_drop;
1972                 }
1973         }
1974         if (state->inode == dentry->d_inode) {
1975                 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1976                 nfs4_intent_set_file(nd, &path, state, fmode);
1977                 return 1;
1978         }
1979         nfs4_close_sync(&path, state, fmode);
1980 out_drop:
1981         d_drop(dentry);
1982         return 0;
1983 }
1984
1985 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
1986 {
1987         if (ctx->state == NULL)
1988                 return;
1989         if (is_sync)
1990                 nfs4_close_sync(&ctx->path, ctx->state, ctx->mode);
1991         else
1992                 nfs4_close_state(&ctx->path, ctx->state, ctx->mode);
1993 }
1994
1995 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1996 {
1997         struct nfs4_server_caps_arg args = {
1998                 .fhandle = fhandle,
1999         };
2000         struct nfs4_server_caps_res res = {};
2001         struct rpc_message msg = {
2002                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2003                 .rpc_argp = &args,
2004                 .rpc_resp = &res,
2005         };
2006         int status;
2007
2008         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2009         if (status == 0) {
2010                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2011                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2012                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2013                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2014                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2015                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2016                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2017                         server->caps |= NFS_CAP_ACLS;
2018                 if (res.has_links != 0)
2019                         server->caps |= NFS_CAP_HARDLINKS;
2020                 if (res.has_symlinks != 0)
2021                         server->caps |= NFS_CAP_SYMLINKS;
2022                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2023                         server->caps |= NFS_CAP_FILEID;
2024                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2025                         server->caps |= NFS_CAP_MODE;
2026                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2027                         server->caps |= NFS_CAP_NLINK;
2028                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2029                         server->caps |= NFS_CAP_OWNER;
2030                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2031                         server->caps |= NFS_CAP_OWNER_GROUP;
2032                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2033                         server->caps |= NFS_CAP_ATIME;
2034                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2035                         server->caps |= NFS_CAP_CTIME;
2036                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2037                         server->caps |= NFS_CAP_MTIME;
2038
2039                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2040                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2041                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2042                 server->acl_bitmask = res.acl_bitmask;
2043         }
2044
2045         return status;
2046 }
2047
2048 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2049 {
2050         struct nfs4_exception exception = { };
2051         int err;
2052         do {
2053                 err = nfs4_handle_exception(server,
2054                                 _nfs4_server_capabilities(server, fhandle),
2055                                 &exception);
2056         } while (exception.retry);
2057         return err;
2058 }
2059
2060 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2061                 struct nfs_fsinfo *info)
2062 {
2063         struct nfs4_lookup_root_arg args = {
2064                 .bitmask = nfs4_fattr_bitmap,
2065         };
2066         struct nfs4_lookup_res res = {
2067                 .server = server,
2068                 .fattr = info->fattr,
2069                 .fh = fhandle,
2070         };
2071         struct rpc_message msg = {
2072                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2073                 .rpc_argp = &args,
2074                 .rpc_resp = &res,
2075         };
2076
2077         nfs_fattr_init(info->fattr);
2078         return nfs4_call_sync(server, &msg, &args, &res, 0);
2079 }
2080
2081 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2082                 struct nfs_fsinfo *info)
2083 {
2084         struct nfs4_exception exception = { };
2085         int err;
2086         do {
2087                 err = nfs4_handle_exception(server,
2088                                 _nfs4_lookup_root(server, fhandle, info),
2089                                 &exception);
2090         } while (exception.retry);
2091         return err;
2092 }
2093
2094 /*
2095  * get the file handle for the "/" directory on the server
2096  */
2097 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2098                               struct nfs_fsinfo *info)
2099 {
2100         int status;
2101
2102         status = nfs4_lookup_root(server, fhandle, info);
2103         if (status == 0)
2104                 status = nfs4_server_capabilities(server, fhandle);
2105         if (status == 0)
2106                 status = nfs4_do_fsinfo(server, fhandle, info);
2107         return nfs4_map_errors(status);
2108 }
2109
2110 /*
2111  * Get locations and (maybe) other attributes of a referral.
2112  * Note that we'll actually follow the referral later when
2113  * we detect fsid mismatch in inode revalidation
2114  */
2115 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2116 {
2117         int status = -ENOMEM;
2118         struct page *page = NULL;
2119         struct nfs4_fs_locations *locations = NULL;
2120
2121         page = alloc_page(GFP_KERNEL);
2122         if (page == NULL)
2123                 goto out;
2124         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2125         if (locations == NULL)
2126                 goto out;
2127
2128         status = nfs4_proc_fs_locations(dir, name, locations, page);
2129         if (status != 0)
2130                 goto out;
2131         /* Make sure server returned a different fsid for the referral */
2132         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2133                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __func__, name->name);
2134                 status = -EIO;
2135                 goto out;
2136         }
2137
2138         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2139         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
2140         if (!fattr->mode)
2141                 fattr->mode = S_IFDIR;
2142         memset(fhandle, 0, sizeof(struct nfs_fh));
2143 out:
2144         if (page)
2145                 __free_page(page);
2146         if (locations)
2147                 kfree(locations);
2148         return status;
2149 }
2150
2151 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2152 {
2153         struct nfs4_getattr_arg args = {
2154                 .fh = fhandle,
2155                 .bitmask = server->attr_bitmask,
2156         };
2157         struct nfs4_getattr_res res = {
2158                 .fattr = fattr,
2159                 .server = server,
2160         };
2161         struct rpc_message msg = {
2162                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2163                 .rpc_argp = &args,
2164                 .rpc_resp = &res,
2165         };
2166         
2167         nfs_fattr_init(fattr);
2168         return nfs4_call_sync(server, &msg, &args, &res, 0);
2169 }
2170
2171 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2172 {
2173         struct nfs4_exception exception = { };
2174         int err;
2175         do {
2176                 err = nfs4_handle_exception(server,
2177                                 _nfs4_proc_getattr(server, fhandle, fattr),
2178                                 &exception);
2179         } while (exception.retry);
2180         return err;
2181 }
2182
2183 /* 
2184  * The file is not closed if it is opened due to the a request to change
2185  * the size of the file. The open call will not be needed once the
2186  * VFS layer lookup-intents are implemented.
2187  *
2188  * Close is called when the inode is destroyed.
2189  * If we haven't opened the file for O_WRONLY, we
2190  * need to in the size_change case to obtain a stateid.
2191  *
2192  * Got race?
2193  * Because OPEN is always done by name in nfsv4, it is
2194  * possible that we opened a different file by the same
2195  * name.  We can recognize this race condition, but we
2196  * can't do anything about it besides returning an error.
2197  *
2198  * This will be fixed with VFS changes (lookup-intent).
2199  */
2200 static int
2201 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2202                   struct iattr *sattr)
2203 {
2204         struct inode *inode = dentry->d_inode;
2205         struct rpc_cred *cred = NULL;
2206         struct nfs4_state *state = NULL;
2207         int status;
2208
2209         nfs_fattr_init(fattr);
2210         
2211         /* Search for an existing open(O_WRITE) file */
2212         if (sattr->ia_valid & ATTR_FILE) {
2213                 struct nfs_open_context *ctx;
2214
2215                 ctx = nfs_file_open_context(sattr->ia_file);
2216                 if (ctx) {
2217                         cred = ctx->cred;
2218                         state = ctx->state;
2219                 }
2220         }
2221
2222         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2223         if (status == 0)
2224                 nfs_setattr_update_inode(inode, sattr);
2225         return status;
2226 }
2227
2228 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
2229                 const struct qstr *name, struct nfs_fh *fhandle,
2230                 struct nfs_fattr *fattr)
2231 {
2232         int                    status;
2233         struct nfs4_lookup_arg args = {
2234                 .bitmask = server->attr_bitmask,
2235                 .dir_fh = dirfh,
2236                 .name = name,
2237         };
2238         struct nfs4_lookup_res res = {
2239                 .server = server,
2240                 .fattr = fattr,
2241                 .fh = fhandle,
2242         };
2243         struct rpc_message msg = {
2244                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2245                 .rpc_argp = &args,
2246                 .rpc_resp = &res,
2247         };
2248
2249         nfs_fattr_init(fattr);
2250
2251         dprintk("NFS call  lookupfh %s\n", name->name);
2252         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2253         dprintk("NFS reply lookupfh: %d\n", status);
2254         return status;
2255 }
2256
2257 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
2258                               struct qstr *name, struct nfs_fh *fhandle,
2259                               struct nfs_fattr *fattr)
2260 {
2261         struct nfs4_exception exception = { };
2262         int err;
2263         do {
2264                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
2265                 /* FIXME: !!!! */
2266                 if (err == -NFS4ERR_MOVED) {
2267                         err = -EREMOTE;
2268                         break;
2269                 }
2270                 err = nfs4_handle_exception(server, err, &exception);
2271         } while (exception.retry);
2272         return err;
2273 }
2274
2275 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
2276                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2277 {
2278         int status;
2279         
2280         dprintk("NFS call  lookup %s\n", name->name);
2281         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
2282         if (status == -NFS4ERR_MOVED)
2283                 status = nfs4_get_referral(dir, name, fattr, fhandle);
2284         dprintk("NFS reply lookup: %d\n", status);
2285         return status;
2286 }
2287
2288 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2289 {
2290         struct nfs4_exception exception = { };
2291         int err;
2292         do {
2293                 err = nfs4_handle_exception(NFS_SERVER(dir),
2294                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
2295                                 &exception);
2296         } while (exception.retry);
2297         return err;
2298 }
2299
2300 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2301 {
2302         struct nfs_server *server = NFS_SERVER(inode);
2303         struct nfs_fattr fattr;
2304         struct nfs4_accessargs args = {
2305                 .fh = NFS_FH(inode),
2306                 .bitmask = server->attr_bitmask,
2307         };
2308         struct nfs4_accessres res = {
2309                 .server = server,
2310                 .fattr = &fattr,
2311         };
2312         struct rpc_message msg = {
2313                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2314                 .rpc_argp = &args,
2315                 .rpc_resp = &res,
2316                 .rpc_cred = entry->cred,
2317         };
2318         int mode = entry->mask;
2319         int status;
2320
2321         /*
2322          * Determine which access bits we want to ask for...
2323          */
2324         if (mode & MAY_READ)
2325                 args.access |= NFS4_ACCESS_READ;
2326         if (S_ISDIR(inode->i_mode)) {
2327                 if (mode & MAY_WRITE)
2328                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2329                 if (mode & MAY_EXEC)
2330                         args.access |= NFS4_ACCESS_LOOKUP;
2331         } else {
2332                 if (mode & MAY_WRITE)
2333                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2334                 if (mode & MAY_EXEC)
2335                         args.access |= NFS4_ACCESS_EXECUTE;
2336         }
2337         nfs_fattr_init(&fattr);
2338         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2339         if (!status) {
2340                 entry->mask = 0;
2341                 if (res.access & NFS4_ACCESS_READ)
2342                         entry->mask |= MAY_READ;
2343                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2344                         entry->mask |= MAY_WRITE;
2345                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2346                         entry->mask |= MAY_EXEC;
2347                 nfs_refresh_inode(inode, &fattr);
2348         }
2349         return status;
2350 }
2351
2352 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2353 {
2354         struct nfs4_exception exception = { };
2355         int err;
2356         do {
2357                 err = nfs4_handle_exception(NFS_SERVER(inode),
2358                                 _nfs4_proc_access(inode, entry),
2359                                 &exception);
2360         } while (exception.retry);
2361         return err;
2362 }
2363
2364 /*
2365  * TODO: For the time being, we don't try to get any attributes
2366  * along with any of the zero-copy operations READ, READDIR,
2367  * READLINK, WRITE.
2368  *
2369  * In the case of the first three, we want to put the GETATTR
2370  * after the read-type operation -- this is because it is hard
2371  * to predict the length of a GETATTR response in v4, and thus
2372  * align the READ data correctly.  This means that the GETATTR
2373  * may end up partially falling into the page cache, and we should
2374  * shift it into the 'tail' of the xdr_buf before processing.
2375  * To do this efficiently, we need to know the total length
2376  * of data received, which doesn't seem to be available outside
2377  * of the RPC layer.
2378  *
2379  * In the case of WRITE, we also want to put the GETATTR after
2380  * the operation -- in this case because we want to make sure
2381  * we get the post-operation mtime and size.  This means that
2382  * we can't use xdr_encode_pages() as written: we need a variant
2383  * of it which would leave room in the 'tail' iovec.
2384  *
2385  * Both of these changes to the XDR layer would in fact be quite
2386  * minor, but I decided to leave them for a subsequent patch.
2387  */
2388 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2389                 unsigned int pgbase, unsigned int pglen)
2390 {
2391         struct nfs4_readlink args = {
2392                 .fh       = NFS_FH(inode),
2393                 .pgbase   = pgbase,
2394                 .pglen    = pglen,
2395                 .pages    = &page,
2396         };
2397         struct nfs4_readlink_res res;
2398         struct rpc_message msg = {
2399                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2400                 .rpc_argp = &args,
2401                 .rpc_resp = &res,
2402         };
2403
2404         return nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
2405 }
2406
2407 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2408                 unsigned int pgbase, unsigned int pglen)
2409 {
2410         struct nfs4_exception exception = { };
2411         int err;
2412         do {
2413                 err = nfs4_handle_exception(NFS_SERVER(inode),
2414                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2415                                 &exception);
2416         } while (exception.retry);
2417         return err;
2418 }
2419
2420 /*
2421  * Got race?
2422  * We will need to arrange for the VFS layer to provide an atomic open.
2423  * Until then, this create/open method is prone to inefficiency and race
2424  * conditions due to the lookup, create, and open VFS calls from sys_open()
2425  * placed on the wire.
2426  *
2427  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2428  * The file will be opened again in the subsequent VFS open call
2429  * (nfs4_proc_file_open).
2430  *
2431  * The open for read will just hang around to be used by any process that
2432  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2433  */
2434
2435 static int
2436 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2437                  int flags, struct nameidata *nd)
2438 {
2439         struct path path = {
2440                 .mnt = nd->path.mnt,
2441                 .dentry = dentry,
2442         };
2443         struct nfs4_state *state;
2444         struct rpc_cred *cred;
2445         fmode_t fmode = flags & (FMODE_READ | FMODE_WRITE);
2446         int status = 0;
2447
2448         cred = rpc_lookup_cred();
2449         if (IS_ERR(cred)) {
2450                 status = PTR_ERR(cred);
2451                 goto out;
2452         }
2453         state = nfs4_do_open(dir, &path, fmode, flags, sattr, cred);
2454         d_drop(dentry);
2455         if (IS_ERR(state)) {
2456                 status = PTR_ERR(state);
2457                 goto out_putcred;
2458         }
2459         d_add(dentry, igrab(state->inode));
2460         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2461         if (flags & O_EXCL) {
2462                 struct nfs_fattr fattr;
2463                 status = nfs4_do_setattr(state->inode, cred, &fattr, sattr, state);
2464                 if (status == 0)
2465                         nfs_setattr_update_inode(state->inode, sattr);
2466                 nfs_post_op_update_inode(state->inode, &fattr);
2467         }
2468         if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
2469                 status = nfs4_intent_set_file(nd, &path, state, fmode);
2470         else
2471                 nfs4_close_sync(&path, state, fmode);
2472 out_putcred:
2473         put_rpccred(cred);
2474 out:
2475         return status;
2476 }
2477
2478 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2479 {
2480         struct nfs_server *server = NFS_SERVER(dir);
2481         struct nfs_removeargs args = {
2482                 .fh = NFS_FH(dir),
2483                 .name.len = name->len,
2484                 .name.name = name->name,
2485                 .bitmask = server->attr_bitmask,
2486         };
2487         struct nfs_removeres res = {
2488                 .server = server,
2489         };
2490         struct rpc_message msg = {
2491                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2492                 .rpc_argp = &args,
2493                 .rpc_resp = &res,
2494         };
2495         int                     status;
2496
2497         nfs_fattr_init(&res.dir_attr);
2498         status = nfs4_call_sync(server, &msg, &args, &res, 1);
2499         if (status == 0) {
2500                 update_changeattr(dir, &res.cinfo);
2501                 nfs_post_op_update_inode(dir, &res.dir_attr);
2502         }
2503         return status;
2504 }
2505
2506 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2507 {
2508         struct nfs4_exception exception = { };
2509         int err;
2510         do {
2511                 err = nfs4_handle_exception(NFS_SERVER(dir),
2512                                 _nfs4_proc_remove(dir, name),
2513                                 &exception);
2514         } while (exception.retry);
2515         return err;
2516 }
2517
2518 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2519 {
2520         struct nfs_server *server = NFS_SERVER(dir);
2521         struct nfs_removeargs *args = msg->rpc_argp;
2522         struct nfs_removeres *res = msg->rpc_resp;
2523
2524         args->bitmask = server->cache_consistency_bitmask;
2525         res->server = server;
2526         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2527 }
2528
2529 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2530 {
2531         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2532
2533         nfs4_sequence_done(res->server, &res->seq_res, task->tk_status);
2534         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2535                 return 0;
2536         update_changeattr(dir, &res->cinfo);
2537         nfs_post_op_update_inode(dir, &res->dir_attr);
2538         return 1;
2539 }
2540
2541 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2542                 struct inode *new_dir, struct qstr *new_name)
2543 {
2544         struct nfs_server *server = NFS_SERVER(old_dir);
2545         struct nfs4_rename_arg arg = {
2546                 .old_dir = NFS_FH(old_dir),
2547                 .new_dir = NFS_FH(new_dir),
2548                 .old_name = old_name,
2549                 .new_name = new_name,
2550                 .bitmask = server->attr_bitmask,
2551         };
2552         struct nfs_fattr old_fattr, new_fattr;
2553         struct nfs4_rename_res res = {
2554                 .server = server,
2555                 .old_fattr = &old_fattr,
2556                 .new_fattr = &new_fattr,
2557         };
2558         struct rpc_message msg = {
2559                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2560                 .rpc_argp = &arg,
2561                 .rpc_resp = &res,
2562         };
2563         int                     status;
2564         
2565         nfs_fattr_init(res.old_fattr);
2566         nfs_fattr_init(res.new_fattr);
2567         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2568
2569         if (!status) {
2570                 update_changeattr(old_dir, &res.old_cinfo);
2571                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2572                 update_changeattr(new_dir, &res.new_cinfo);
2573                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2574         }
2575         return status;
2576 }
2577
2578 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2579                 struct inode *new_dir, struct qstr *new_name)
2580 {
2581         struct nfs4_exception exception = { };
2582         int err;
2583         do {
2584                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2585                                 _nfs4_proc_rename(old_dir, old_name,
2586                                         new_dir, new_name),
2587                                 &exception);
2588         } while (exception.retry);
2589         return err;
2590 }
2591
2592 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2593 {
2594         struct nfs_server *server = NFS_SERVER(inode);
2595         struct nfs4_link_arg arg = {
2596                 .fh     = NFS_FH(inode),
2597                 .dir_fh = NFS_FH(dir),
2598                 .name   = name,
2599                 .bitmask = server->attr_bitmask,
2600         };
2601         struct nfs_fattr fattr, dir_attr;
2602         struct nfs4_link_res res = {
2603                 .server = server,
2604                 .fattr = &fattr,
2605                 .dir_attr = &dir_attr,
2606         };
2607         struct rpc_message msg = {
2608                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2609                 .rpc_argp = &arg,
2610                 .rpc_resp = &res,
2611         };
2612         int                     status;
2613
2614         nfs_fattr_init(res.fattr);
2615         nfs_fattr_init(res.dir_attr);
2616         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2617         if (!status) {
2618                 update_changeattr(dir, &res.cinfo);
2619                 nfs_post_op_update_inode(dir, res.dir_attr);
2620                 nfs_post_op_update_inode(inode, res.fattr);
2621         }
2622
2623         return status;
2624 }
2625
2626 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2627 {
2628         struct nfs4_exception exception = { };
2629         int err;
2630         do {
2631                 err = nfs4_handle_exception(NFS_SERVER(inode),
2632                                 _nfs4_proc_link(inode, dir, name),
2633                                 &exception);
2634         } while (exception.retry);
2635         return err;
2636 }
2637
2638 struct nfs4_createdata {
2639         struct rpc_message msg;
2640         struct nfs4_create_arg arg;
2641         struct nfs4_create_res res;
2642         struct nfs_fh fh;
2643         struct nfs_fattr fattr;
2644         struct nfs_fattr dir_fattr;
2645 };
2646
2647 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2648                 struct qstr *name, struct iattr *sattr, u32 ftype)
2649 {
2650         struct nfs4_createdata *data;
2651
2652         data = kzalloc(sizeof(*data), GFP_KERNEL);
2653         if (data != NULL) {
2654                 struct nfs_server *server = NFS_SERVER(dir);
2655
2656                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2657                 data->msg.rpc_argp = &data->arg;
2658                 data->msg.rpc_resp = &data->res;
2659                 data->arg.dir_fh = NFS_FH(dir);
2660                 data->arg.server = server;
2661                 data->arg.name = name;
2662                 data->arg.attrs = sattr;
2663                 data->arg.ftype = ftype;
2664                 data->arg.bitmask = server->attr_bitmask;
2665                 data->res.server = server;
2666                 data->res.fh = &data->fh;
2667                 data->res.fattr = &data->fattr;
2668                 data->res.dir_fattr = &data->dir_fattr;
2669                 nfs_fattr_init(data->res.fattr);
2670                 nfs_fattr_init(data->res.dir_fattr);
2671         }
2672         return data;
2673 }
2674
2675 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2676 {
2677         int status = nfs4_call_sync(NFS_SERVER(dir), &data->msg,
2678                                     &data->arg, &data->res, 1);
2679         if (status == 0) {
2680                 update_changeattr(dir, &data->res.dir_cinfo);
2681                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2682                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2683         }
2684         return status;
2685 }
2686
2687 static void nfs4_free_createdata(struct nfs4_createdata *data)
2688 {
2689         kfree(data);
2690 }
2691
2692 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2693                 struct page *page, unsigned int len, struct iattr *sattr)
2694 {
2695         struct nfs4_createdata *data;
2696         int status = -ENAMETOOLONG;
2697
2698         if (len > NFS4_MAXPATHLEN)
2699                 goto out;
2700
2701         status = -ENOMEM;
2702         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2703         if (data == NULL)
2704                 goto out;
2705
2706         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2707         data->arg.u.symlink.pages = &page;
2708         data->arg.u.symlink.len = len;
2709         
2710         status = nfs4_do_create(dir, dentry, data);
2711
2712         nfs4_free_createdata(data);
2713 out:
2714         return status;
2715 }
2716
2717 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2718                 struct page *page, unsigned int len, struct iattr *sattr)
2719 {
2720         struct nfs4_exception exception = { };
2721         int err;
2722         do {
2723                 err = nfs4_handle_exception(NFS_SERVER(dir),
2724                                 _nfs4_proc_symlink(dir, dentry, page,
2725                                                         len, sattr),
2726                                 &exception);
2727         } while (exception.retry);
2728         return err;
2729 }
2730
2731 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2732                 struct iattr *sattr)
2733 {
2734         struct nfs4_createdata *data;
2735         int status = -ENOMEM;
2736
2737         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2738         if (data == NULL)
2739                 goto out;
2740
2741         status = nfs4_do_create(dir, dentry, data);
2742
2743         nfs4_free_createdata(data);
2744 out:
2745         return status;
2746 }
2747
2748 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2749                 struct iattr *sattr)
2750 {
2751         struct nfs4_exception exception = { };
2752         int err;
2753         do {
2754                 err = nfs4_handle_exception(NFS_SERVER(dir),
2755                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2756                                 &exception);
2757         } while (exception.retry);
2758         return err;
2759 }
2760
2761 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2762                   u64 cookie, struct page *page, unsigned int count, int plus)
2763 {
2764         struct inode            *dir = dentry->d_inode;
2765         struct nfs4_readdir_arg args = {
2766                 .fh = NFS_FH(dir),
2767                 .pages = &page,
2768                 .pgbase = 0,
2769                 .count = count,
2770                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2771         };
2772         struct nfs4_readdir_res res;
2773         struct rpc_message msg = {
2774                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2775                 .rpc_argp = &args,
2776                 .rpc_resp = &res,
2777                 .rpc_cred = cred,
2778         };
2779         int                     status;
2780
2781         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
2782                         dentry->d_parent->d_name.name,
2783                         dentry->d_name.name,
2784                         (unsigned long long)cookie);
2785         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2786         res.pgbase = args.pgbase;
2787         status = nfs4_call_sync(NFS_SERVER(dir), &msg, &args, &res, 0);
2788         if (status == 0)
2789                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2790
2791         nfs_invalidate_atime(dir);
2792
2793         dprintk("%s: returns %d\n", __func__, status);
2794         return status;
2795 }
2796
2797 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2798                   u64 cookie, struct page *page, unsigned int count, int plus)
2799 {
2800         struct nfs4_exception exception = { };
2801         int err;
2802         do {
2803                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2804                                 _nfs4_proc_readdir(dentry, cred, cookie,
2805                                         page, count, plus),
2806                                 &exception);
2807         } while (exception.retry);
2808         return err;
2809 }
2810
2811 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2812                 struct iattr *sattr, dev_t rdev)
2813 {
2814         struct nfs4_createdata *data;
2815         int mode = sattr->ia_mode;
2816         int status = -ENOMEM;
2817
2818         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2819         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2820
2821         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
2822         if (data == NULL)
2823                 goto out;
2824
2825         if (S_ISFIFO(mode))
2826                 data->arg.ftype = NF4FIFO;
2827         else if (S_ISBLK(mode)) {
2828                 data->arg.ftype = NF4BLK;
2829                 data->arg.u.device.specdata1 = MAJOR(rdev);
2830                 data->arg.u.device.specdata2 = MINOR(rdev);
2831         }
2832         else if (S_ISCHR(mode)) {
2833                 data->arg.ftype = NF4CHR;
2834                 data->arg.u.device.specdata1 = MAJOR(rdev);
2835                 data->arg.u.device.specdata2 = MINOR(rdev);
2836         }
2837         
2838         status = nfs4_do_create(dir, dentry, data);
2839
2840         nfs4_free_createdata(data);
2841 out:
2842         return status;
2843 }
2844
2845 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2846                 struct iattr *sattr, dev_t rdev)
2847 {
2848         struct nfs4_exception exception = { };
2849         int err;
2850         do {
2851                 err = nfs4_handle_exception(NFS_SERVER(dir),
2852                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2853                                 &exception);
2854         } while (exception.retry);
2855         return err;
2856 }
2857
2858 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2859                  struct nfs_fsstat *fsstat)
2860 {
2861         struct nfs4_statfs_arg args = {
2862                 .fh = fhandle,
2863                 .bitmask = server->attr_bitmask,
2864         };
2865         struct nfs4_statfs_res res = {
2866                 .fsstat = fsstat,
2867         };
2868         struct rpc_message msg = {
2869                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2870                 .rpc_argp = &args,
2871                 .rpc_resp = &res,
2872         };
2873
2874         nfs_fattr_init(fsstat->fattr);
2875         return  nfs4_call_sync(server, &msg, &args, &res, 0);
2876 }
2877
2878 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2879 {
2880         struct nfs4_exception exception = { };
2881         int err;
2882         do {
2883                 err = nfs4_handle_exception(server,
2884                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2885                                 &exception);
2886         } while (exception.retry);
2887         return err;
2888 }
2889
2890 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2891                 struct nfs_fsinfo *fsinfo)
2892 {
2893         struct nfs4_fsinfo_arg args = {
2894                 .fh = fhandle,
2895                 .bitmask = server->attr_bitmask,
2896         };
2897         struct nfs4_fsinfo_res res = {
2898                 .fsinfo = fsinfo,
2899         };
2900         struct rpc_message msg = {
2901                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2902                 .rpc_argp = &args,
2903                 .rpc_resp = &res,
2904         };
2905
2906         return nfs4_call_sync(server, &msg, &args, &res, 0);
2907 }
2908
2909 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2910 {
2911         struct nfs4_exception exception = { };
2912         int err;
2913
2914         do {
2915                 err = nfs4_handle_exception(server,
2916                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2917                                 &exception);
2918         } while (exception.retry);
2919         return err;
2920 }
2921
2922 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2923 {
2924         nfs_fattr_init(fsinfo->fattr);
2925         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2926 }
2927
2928 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2929                 struct nfs_pathconf *pathconf)
2930 {
2931         struct nfs4_pathconf_arg args = {
2932                 .fh = fhandle,
2933                 .bitmask = server->attr_bitmask,
2934         };
2935         struct nfs4_pathconf_res res = {
2936                 .pathconf = pathconf,
2937         };
2938         struct rpc_message msg = {
2939                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2940                 .rpc_argp = &args,
2941                 .rpc_resp = &res,
2942         };
2943
2944         /* None of the pathconf attributes are mandatory to implement */
2945         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2946                 memset(pathconf, 0, sizeof(*pathconf));
2947                 return 0;
2948         }
2949
2950         nfs_fattr_init(pathconf->fattr);
2951         return nfs4_call_sync(server, &msg, &args, &res, 0);
2952 }
2953
2954 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2955                 struct nfs_pathconf *pathconf)
2956 {
2957         struct nfs4_exception exception = { };
2958         int err;
2959
2960         do {
2961                 err = nfs4_handle_exception(server,
2962                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2963                                 &exception);
2964         } while (exception.retry);
2965         return err;
2966 }
2967
2968 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
2969 {
2970         struct nfs_server *server = NFS_SERVER(data->inode);
2971
2972         dprintk("--> %s\n", __func__);
2973
2974         nfs4_sequence_done(server, &data->res.seq_res, task->tk_status);
2975
2976         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
2977                 nfs4_restart_rpc(task, server->nfs_client);
2978                 return -EAGAIN;
2979         }
2980
2981         nfs_invalidate_atime(data->inode);
2982         if (task->tk_status > 0)
2983                 renew_lease(server, data->timestamp);
2984         return 0;
2985 }
2986
2987 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
2988 {
2989         data->timestamp   = jiffies;
2990         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
2991 }
2992
2993 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
2994 {
2995         struct inode *inode = data->inode;
2996         
2997         nfs4_sequence_done(NFS_SERVER(inode), &data->res.seq_res,
2998                            task->tk_status);
2999
3000         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3001                 nfs4_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3002                 return -EAGAIN;
3003         }
3004         if (task->tk_status >= 0) {
3005                 renew_lease(NFS_SERVER(inode), data->timestamp);
3006                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3007         }
3008         return 0;
3009 }
3010
3011 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3012 {
3013         struct nfs_server *server = NFS_SERVER(data->inode);
3014
3015         data->args.bitmask = server->cache_consistency_bitmask;
3016         data->res.server = server;
3017         data->timestamp   = jiffies;
3018
3019         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3020 }
3021
3022 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3023 {
3024         struct inode *inode = data->inode;
3025         
3026         nfs4_sequence_done(NFS_SERVER(inode), &data->res.seq_res,
3027                            task->tk_status);
3028         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3029                 nfs4_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3030                 return -EAGAIN;
3031         }
3032         nfs_refresh_inode(inode, data->res.fattr);
3033         return 0;
3034 }
3035
3036 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3037 {
3038         struct nfs_server *server = NFS_SERVER(data->inode);
3039         
3040         data->args.bitmask = server->cache_consistency_bitmask;
3041         data->res.server = server;
3042         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3043 }
3044
3045 /*
3046  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3047  * standalone procedure for queueing an asynchronous RENEW.
3048  */
3049 static void nfs4_renew_done(struct rpc_task *task, void *data)
3050 {
3051         struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
3052         unsigned long timestamp = (unsigned long)data;
3053
3054         if (task->tk_status < 0) {
3055                 /* Unless we're shutting down, schedule state recovery! */
3056                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) != 0)
3057                         nfs4_schedule_state_recovery(clp);
3058                 return;
3059         }
3060         spin_lock(&clp->cl_lock);
3061         if (time_before(clp->cl_last_renewal,timestamp))
3062                 clp->cl_last_renewal = timestamp;
3063         spin_unlock(&clp->cl_lock);
3064 }
3065
3066 static const struct rpc_call_ops nfs4_renew_ops = {
3067         .rpc_call_done = nfs4_renew_done,
3068 };
3069
3070 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
3071 {
3072         struct rpc_message msg = {
3073                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3074                 .rpc_argp       = clp,
3075                 .rpc_cred       = cred,
3076         };
3077
3078         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3079                         &nfs4_renew_ops, (void *)jiffies);
3080 }
3081
3082 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3083 {
3084         struct rpc_message msg = {
3085                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3086                 .rpc_argp       = clp,
3087                 .rpc_cred       = cred,
3088         };
3089         unsigned long now = jiffies;
3090         int status;
3091
3092         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3093         if (status < 0)
3094                 return status;
3095         spin_lock(&clp->cl_lock);
3096         if (time_before(clp->cl_last_renewal,now))
3097                 clp->cl_last_renewal = now;
3098         spin_unlock(&clp->cl_lock);
3099         return 0;
3100 }
3101
3102 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3103 {
3104         return (server->caps & NFS_CAP_ACLS)
3105                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3106                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3107 }
3108
3109 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3110  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3111  * the stack.
3112  */
3113 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3114
3115 static void buf_to_pages(const void *buf, size_t buflen,
3116                 struct page **pages, unsigned int *pgbase)
3117 {
3118         const void *p = buf;
3119
3120         *pgbase = offset_in_page(buf);
3121         p -= *pgbase;
3122         while (p < buf + buflen) {
3123                 *(pages++) = virt_to_page(p);
3124                 p += PAGE_CACHE_SIZE;
3125         }
3126 }
3127
3128 struct nfs4_cached_acl {
3129         int cached;
3130         size_t len;
3131         char data[0];
3132 };
3133
3134 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3135 {
3136         struct nfs_inode *nfsi = NFS_I(inode);
3137
3138         spin_lock(&inode->i_lock);
3139         kfree(nfsi->nfs4_acl);
3140         nfsi->nfs4_acl = acl;
3141         spin_unlock(&inode->i_lock);
3142 }
3143
3144 static void nfs4_zap_acl_attr(struct inode *inode)
3145 {
3146         nfs4_set_cached_acl(inode, NULL);
3147 }
3148
3149 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3150 {
3151         struct nfs_inode *nfsi = NFS_I(inode);
3152         struct nfs4_cached_acl *acl;
3153         int ret = -ENOENT;
3154
3155         spin_lock(&inode->i_lock);
3156         acl = nfsi->nfs4_acl;
3157         if (acl == NULL)
3158                 goto out;
3159         if (buf == NULL) /* user is just asking for length */
3160                 goto out_len;
3161         if (acl->cached == 0)
3162                 goto out;
3163         ret = -ERANGE; /* see getxattr(2) man page */
3164         if (acl->len > buflen)
3165                 goto out;
3166         memcpy(buf, acl->data, acl->len);
3167 out_len:
3168         ret = acl->len;
3169 out:
3170         spin_unlock(&inode->i_lock);
3171         return ret;
3172 }
3173
3174 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
3175 {
3176         struct nfs4_cached_acl *acl;
3177
3178         if (buf && acl_len <= PAGE_SIZE) {
3179                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3180                 if (acl == NULL)
3181                         goto out;
3182                 acl->cached = 1;
3183                 memcpy(acl->data, buf, acl_len);
3184         } else {
3185                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3186                 if (acl == NULL)
3187                         goto out;
3188                 acl->cached = 0;
3189         }
3190         acl->len = acl_len;
3191 out:
3192         nfs4_set_cached_acl(inode, acl);
3193 }
3194
3195 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3196 {
3197         struct page *pages[NFS4ACL_MAXPAGES];
3198         struct nfs_getaclargs args = {
3199                 .fh = NFS_FH(inode),
3200                 .acl_pages = pages,
3201                 .acl_len = buflen,
3202         };
3203         struct nfs_getaclres res = {
3204                 .acl_len = buflen,
3205         };
3206         void *resp_buf;
3207         struct rpc_message msg = {
3208                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3209                 .rpc_argp = &args,
3210                 .rpc_resp = &res,
3211         };
3212         struct page *localpage = NULL;
3213         int ret;
3214
3215         if (buflen < PAGE_SIZE) {
3216                 /* As long as we're doing a round trip to the server anyway,
3217                  * let's be prepared for a page of acl data. */
3218                 localpage = alloc_page(GFP_KERNEL);
3219                 resp_buf = page_address(localpage);
3220                 if (localpage == NULL)
3221                         return -ENOMEM;
3222                 args.acl_pages[0] = localpage;
3223                 args.acl_pgbase = 0;
3224                 args.acl_len = PAGE_SIZE;
3225         } else {
3226                 resp_buf = buf;
3227                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
3228         }
3229         ret = nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
3230         if (ret)
3231                 goto out_free;
3232         if (res.acl_len > args.acl_len)
3233                 nfs4_write_cached_acl(inode, NULL, res.acl_len);
3234         else
3235                 nfs4_write_cached_acl(inode, resp_buf, res.acl_len);
3236         if (buf) {
3237                 ret = -ERANGE;
3238                 if (res.acl_len > buflen)
3239                         goto out_free;
3240                 if (localpage)
3241                         memcpy(buf, resp_buf, res.acl_len);
3242         }
3243         ret = res.acl_len;
3244 out_free:
3245         if (localpage)
3246                 __free_page(localpage);
3247         return ret;
3248 }
3249
3250 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3251 {
3252         struct nfs4_exception exception = { };
3253         ssize_t ret;
3254         do {
3255                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3256                 if (ret >= 0)
3257                         break;
3258                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3259         } while (exception.retry);
3260         return ret;
3261 }
3262
3263 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3264 {
3265         struct nfs_server *server = NFS_SERVER(inode);
3266         int ret;
3267
3268         if (!nfs4_server_supports_acls(server))
3269                 return -EOPNOTSUPP;
3270         ret = nfs_revalidate_inode(server, inode);
3271         if (ret < 0)
3272                 return ret;
3273         ret = nfs4_read_cached_acl(inode, buf, buflen);
3274         if (ret != -ENOENT)
3275                 return ret;
3276         return nfs4_get_acl_uncached(inode, buf, buflen);
3277 }
3278
3279 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3280 {
3281         struct nfs_server *server = NFS_SERVER(inode);
3282         struct page *pages[NFS4ACL_MAXPAGES];
3283         struct nfs_setaclargs arg = {
3284                 .fh             = NFS_FH(inode),
3285                 .acl_pages      = pages,
3286                 .acl_len        = buflen,
3287         };
3288         struct nfs_setaclres res;
3289         struct rpc_message msg = {
3290                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3291                 .rpc_argp       = &arg,
3292                 .rpc_resp       = &res,
3293         };
3294         int ret;
3295
3296         if (!nfs4_server_supports_acls(server))
3297                 return -EOPNOTSUPP;
3298         nfs_inode_return_delegation(inode);
3299         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3300         ret = nfs4_call_sync(server, &msg, &arg, &res, 1);
3301         nfs_access_zap_cache(inode);
3302         nfs_zap_acl_cache(inode);
3303         return ret;
3304 }
3305
3306 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3307 {
3308         struct nfs4_exception exception = { };
3309         int err;
3310         do {
3311                 err = nfs4_handle_exception(NFS_SERVER(inode),
3312                                 __nfs4_proc_set_acl(inode, buf, buflen),
3313                                 &exception);
3314         } while (exception.retry);
3315         return err;
3316 }
3317
3318 static int
3319 _nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs_client *clp, struct nfs4_state *state)
3320 {
3321         if (!clp || task->tk_status >= 0)
3322                 return 0;
3323         switch(task->tk_status) {
3324                 case -NFS4ERR_ADMIN_REVOKED:
3325                 case -NFS4ERR_BAD_STATEID:
3326                 case -NFS4ERR_OPENMODE:
3327                         if (state == NULL)
3328                                 break;
3329                         nfs4_state_mark_reclaim_nograce(clp, state);
3330                 case -NFS4ERR_STALE_CLIENTID:
3331                 case -NFS4ERR_STALE_STATEID:
3332                 case -NFS4ERR_EXPIRED:
3333                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3334                         nfs4_schedule_state_recovery(clp);
3335                         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3336                                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3337                         task->tk_status = 0;
3338                         return -EAGAIN;
3339 #if defined(CONFIG_NFS_V4_1)
3340                 case -NFS4ERR_BADSESSION:
3341                 case -NFS4ERR_BADSLOT:
3342                 case -NFS4ERR_BAD_HIGH_SLOT:
3343                 case -NFS4ERR_DEADSESSION:
3344                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3345                 case -NFS4ERR_SEQ_FALSE_RETRY:
3346                 case -NFS4ERR_SEQ_MISORDERED:
3347                         dprintk("%s ERROR %d, Reset session\n", __func__,
3348                                 task->tk_status);
3349                         nfs4_schedule_state_recovery(clp);
3350                         task->tk_status = 0;
3351                         return -EAGAIN;
3352 #endif /* CONFIG_NFS_V4_1 */
3353                 case -NFS4ERR_DELAY:
3354                         if (server)
3355                                 nfs_inc_server_stats(server, NFSIOS_DELAY);
3356                 case -NFS4ERR_GRACE:
3357                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3358                         task->tk_status = 0;
3359                         return -EAGAIN;
3360                 case -NFS4ERR_OLD_STATEID:
3361                         task->tk_status = 0;
3362                         return -EAGAIN;
3363         }
3364         task->tk_status = nfs4_map_errors(task->tk_status);
3365         return 0;
3366 }
3367
3368 static int
3369 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3370 {
3371         return _nfs4_async_handle_error(task, server, server->nfs_client, state);
3372 }
3373
3374 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
3375 {
3376         nfs4_verifier sc_verifier;
3377         struct nfs4_setclientid setclientid = {
3378                 .sc_verifier = &sc_verifier,
3379                 .sc_prog = program,
3380         };
3381         struct rpc_message msg = {
3382                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3383                 .rpc_argp = &setclientid,
3384                 .rpc_resp = clp,
3385                 .rpc_cred = cred,
3386         };
3387         __be32 *p;
3388         int loop = 0;
3389         int status;
3390
3391         p = (__be32*)sc_verifier.data;
3392         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3393         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3394
3395         for(;;) {
3396                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3397                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3398                                 clp->cl_ipaddr,
3399                                 rpc_peeraddr2str(clp->cl_rpcclient,
3400                                                         RPC_DISPLAY_ADDR),
3401                                 rpc_peeraddr2str(clp->cl_rpcclient,
3402                                                         RPC_DISPLAY_PROTO),
3403                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3404                                 clp->cl_id_uniquifier);
3405                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3406                                 sizeof(setclientid.sc_netid),
3407                                 rpc_peeraddr2str(clp->cl_rpcclient,
3408                                                         RPC_DISPLAY_NETID));
3409                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3410                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3411                                 clp->cl_ipaddr, port >> 8, port & 255);
3412
3413                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3414                 if (status != -NFS4ERR_CLID_INUSE)
3415                         break;
3416                 if (signalled())
3417                         break;
3418                 if (loop++ & 1)
3419                         ssleep(clp->cl_lease_time + 1);
3420                 else
3421                         if (++clp->cl_id_uniquifier == 0)
3422                                 break;
3423         }
3424         return status;
3425 }
3426
3427 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
3428 {
3429         struct nfs_fsinfo fsinfo;
3430         struct rpc_message msg = {
3431                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3432                 .rpc_argp = clp,
3433                 .rpc_resp = &fsinfo,
3434                 .rpc_cred = cred,
3435         };
3436         unsigned long now;
3437         int status;
3438
3439         now = jiffies;
3440         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3441         if (status == 0) {
3442                 spin_lock(&clp->cl_lock);
3443                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3444                 clp->cl_last_renewal = now;
3445                 spin_unlock(&clp->cl_lock);
3446         }
3447         return status;
3448 }
3449
3450 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
3451 {
3452         long timeout = 0;
3453         int err;
3454         do {
3455                 err = _nfs4_proc_setclientid_confirm(clp, cred);
3456                 switch (err) {
3457                         case 0:
3458                                 return err;
3459                         case -NFS4ERR_RESOURCE:
3460                                 /* The IBM lawyers misread another document! */
3461                         case -NFS4ERR_DELAY:
3462                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
3463                 }
3464         } while (err == 0);
3465         return err;
3466 }
3467
3468 struct nfs4_delegreturndata {
3469         struct nfs4_delegreturnargs args;
3470         struct nfs4_delegreturnres res;
3471         struct nfs_fh fh;
3472         nfs4_stateid stateid;
3473         unsigned long timestamp;
3474         struct nfs_fattr fattr;
3475         int rpc_status;
3476 };
3477
3478 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3479 {
3480         struct nfs4_delegreturndata *data = calldata;
3481
3482         nfs4_sequence_done(data->res.server, &data->res.seq_res,
3483                         task->tk_status);
3484
3485         data->rpc_status = task->tk_status;
3486         if (data->rpc_status == 0)
3487                 renew_lease(data->res.server, data->timestamp);
3488 }
3489
3490 static void nfs4_delegreturn_release(void *calldata)
3491 {
3492         kfree(calldata);
3493 }
3494
3495 #if defined(CONFIG_NFS_V4_1)
3496 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3497 {
3498         struct nfs4_delegreturndata *d_data;
3499
3500         d_data = (struct nfs4_delegreturndata *)data;
3501
3502         if (nfs4_setup_sequence(d_data->res.server->nfs_client,
3503                                 &d_data->args.seq_args,
3504                                 &d_data->res.seq_res, 1, task))
3505                 return;
3506         rpc_call_start(task);
3507 }
3508 #endif /* CONFIG_NFS_V4_1 */
3509
3510 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3511 #if defined(CONFIG_NFS_V4_1)
3512         .rpc_call_prepare = nfs4_delegreturn_prepare,
3513 #endif /* CONFIG_NFS_V4_1 */
3514         .rpc_call_done = nfs4_delegreturn_done,
3515         .rpc_release = nfs4_delegreturn_release,
3516 };
3517
3518 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3519 {
3520         struct nfs4_delegreturndata *data;
3521         struct nfs_server *server = NFS_SERVER(inode);
3522         struct rpc_task *task;
3523         struct rpc_message msg = {
3524                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3525                 .rpc_cred = cred,
3526         };
3527         struct rpc_task_setup task_setup_data = {
3528                 .rpc_client = server->client,
3529                 .rpc_message = &msg,
3530                 .callback_ops = &nfs4_delegreturn_ops,
3531                 .flags = RPC_TASK_ASYNC,
3532         };
3533         int status = 0;
3534
3535         data = kzalloc(sizeof(*data), GFP_KERNEL);
3536         if (data == NULL)
3537                 return -ENOMEM;
3538         data->args.fhandle = &data->fh;
3539         data->args.stateid = &data->stateid;
3540         data->args.bitmask = server->attr_bitmask;
3541         nfs_copy_fh(&data->fh, NFS_FH(inode));
3542         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3543         data->res.fattr = &data->fattr;
3544         data->res.server = server;
3545         data->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3546         nfs_fattr_init(data->res.fattr);
3547         data->timestamp = jiffies;
3548         data->rpc_status = 0;
3549
3550         task_setup_data.callback_data = data;
3551         msg.rpc_argp = &data->args,
3552         msg.rpc_resp = &data->res,
3553         task = rpc_run_task(&task_setup_data);
3554         if (IS_ERR(task))
3555                 return PTR_ERR(task);
3556         if (!issync)
3557                 goto out;
3558         status = nfs4_wait_for_completion_rpc_task(task);
3559         if (status != 0)
3560                 goto out;
3561         status = data->rpc_status;
3562         if (status != 0)
3563                 goto out;
3564         nfs_refresh_inode(inode, &data->fattr);
3565 out:
3566         rpc_put_task(task);
3567         return status;
3568 }
3569
3570 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3571 {
3572         struct nfs_server *server = NFS_SERVER(inode);
3573         struct nfs4_exception exception = { };
3574         int err;
3575         do {
3576                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3577                 switch (err) {
3578                         case -NFS4ERR_STALE_STATEID:
3579                         case -NFS4ERR_EXPIRED:
3580                         case 0:
3581                                 return 0;
3582                 }
3583                 err = nfs4_handle_exception(server, err, &exception);
3584         } while (exception.retry);
3585         return err;
3586 }
3587
3588 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3589 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3590
3591 /* 
3592  * sleep, with exponential backoff, and retry the LOCK operation. 
3593  */
3594 static unsigned long
3595 nfs4_set_lock_task_retry(unsigned long timeout)
3596 {
3597         schedule_timeout_killable(timeout);
3598         timeout <<= 1;
3599         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3600                 return NFS4_LOCK_MAXTIMEOUT;
3601         return timeout;
3602 }
3603
3604 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3605 {
3606         struct inode *inode = state->inode;
3607         struct nfs_server *server = NFS_SERVER(inode);
3608         struct nfs_client *clp = server->nfs_client;
3609         struct nfs_lockt_args arg = {
3610                 .fh = NFS_FH(inode),
3611                 .fl = request,
3612         };
3613         struct nfs_lockt_res res = {
3614                 .denied = request,
3615         };
3616         struct rpc_message msg = {
3617                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3618                 .rpc_argp       = &arg,
3619                 .rpc_resp       = &res,
3620                 .rpc_cred       = state->owner->so_cred,
3621         };
3622         struct nfs4_lock_state *lsp;
3623         int status;
3624
3625         arg.lock_owner.clientid = clp->cl_clientid;
3626         status = nfs4_set_lock_state(state, request);
3627         if (status != 0)
3628                 goto out;
3629         lsp = request->fl_u.nfs4_fl.owner;
3630         arg.lock_owner.id = lsp->ls_id.id;
3631         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
3632         switch (status) {
3633                 case 0:
3634                         request->fl_type = F_UNLCK;
3635                         break;
3636                 case -NFS4ERR_DENIED:
3637                         status = 0;
3638         }
3639         request->fl_ops->fl_release_private(request);
3640 out:
3641         return status;
3642 }
3643
3644 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3645 {
3646         struct nfs4_exception exception = { };
3647         int err;
3648
3649         do {
3650                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3651                                 _nfs4_proc_getlk(state, cmd, request),
3652                                 &exception);
3653         } while (exception.retry);
3654         return err;
3655 }
3656
3657 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3658 {
3659         int res = 0;
3660         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3661                 case FL_POSIX:
3662                         res = posix_lock_file_wait(file, fl);
3663                         break;
3664                 case FL_FLOCK:
3665                         res = flock_lock_file_wait(file, fl);
3666                         break;
3667                 default:
3668                         BUG();
3669         }
3670         return res;
3671 }
3672
3673 struct nfs4_unlockdata {
3674         struct nfs_locku_args arg;
3675         struct nfs_locku_res res;
3676         struct nfs4_lock_state *lsp;
3677         struct nfs_open_context *ctx;
3678         struct file_lock fl;
3679         const struct nfs_server *server;
3680         unsigned long timestamp;
3681 };
3682
3683 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3684                 struct nfs_open_context *ctx,
3685                 struct nfs4_lock_state *lsp,
3686                 struct nfs_seqid *seqid)
3687 {
3688         struct nfs4_unlockdata *p;
3689         struct inode *inode = lsp->ls_state->inode;
3690
3691         p = kzalloc(sizeof(*p), GFP_KERNEL);
3692         if (p == NULL)
3693                 return NULL;
3694         p->arg.fh = NFS_FH(inode);
3695         p->arg.fl = &p->fl;
3696         p->arg.seqid = seqid;
3697         p->res.seqid = seqid;
3698         p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3699         p->arg.stateid = &lsp->ls_stateid;
3700         p->lsp = lsp;
3701         atomic_inc(&lsp->ls_count);
3702         /* Ensure we don't close file until we're done freeing locks! */
3703         p->ctx = get_nfs_open_context(ctx);
3704         memcpy(&p->fl, fl, sizeof(p->fl));
3705         p->server = NFS_SERVER(inode);
3706         return p;
3707 }
3708
3709 static void nfs4_locku_release_calldata(void *data)
3710 {
3711         struct nfs4_unlockdata *calldata = data;
3712         nfs_free_seqid(calldata->arg.seqid);
3713         nfs4_put_lock_state(calldata->lsp);
3714         put_nfs_open_context(calldata->ctx);
3715         kfree(calldata);
3716 }
3717
3718 static void nfs4_locku_done(struct rpc_task *task, void *data)
3719 {
3720         struct nfs4_unlockdata *calldata = data;
3721
3722         nfs4_sequence_done(calldata->server, &calldata->res.seq_res,
3723                            task->tk_status);
3724         if (RPC_ASSASSINATED(task))
3725                 return;
3726         switch (task->tk_status) {
3727                 case 0:
3728                         memcpy(calldata->lsp->ls_stateid.data,
3729                                         calldata->res.stateid.data,
3730                                         sizeof(calldata->lsp->ls_stateid.data));
3731                         renew_lease(calldata->server, calldata->timestamp);
3732                         break;
3733                 case -NFS4ERR_BAD_STATEID:
3734                 case -NFS4ERR_OLD_STATEID:
3735                 case -NFS4ERR_STALE_STATEID:
3736                 case -NFS4ERR_EXPIRED:
3737                         break;
3738                 default:
3739                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
3740                                 nfs4_restart_rpc(task,
3741                                                  calldata->server->nfs_client);
3742         }
3743 }
3744
3745 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3746 {
3747         struct nfs4_unlockdata *calldata = data;
3748
3749         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3750                 return;
3751         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3752                 /* Note: exit _without_ running nfs4_locku_done */
3753                 task->tk_action = NULL;
3754                 return;
3755         }
3756         calldata->timestamp = jiffies;
3757         if (nfs4_setup_sequence(calldata->server->nfs_client,
3758                                 &calldata->arg.seq_args,
3759                                 &calldata->res.seq_res, 1, task))
3760                 return;
3761         rpc_call_start(task);
3762 }
3763
3764 static const struct rpc_call_ops nfs4_locku_ops = {
3765         .rpc_call_prepare = nfs4_locku_prepare,
3766         .rpc_call_done = nfs4_locku_done,
3767         .rpc_release = nfs4_locku_release_calldata,
3768 };
3769
3770 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3771                 struct nfs_open_context *ctx,
3772                 struct nfs4_lock_state *lsp,
3773                 struct nfs_seqid *seqid)
3774 {
3775         struct nfs4_unlockdata *data;
3776         struct rpc_message msg = {
3777                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3778                 .rpc_cred = ctx->cred,
3779         };
3780         struct rpc_task_setup task_setup_data = {
3781                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
3782                 .rpc_message = &msg,
3783                 .callback_ops = &nfs4_locku_ops,
3784                 .workqueue = nfsiod_workqueue,
3785                 .flags = RPC_TASK_ASYNC,
3786         };
3787
3788         /* Ensure this is an unlock - when canceling a lock, the
3789          * canceled lock is passed in, and it won't be an unlock.
3790          */
3791         fl->fl_type = F_UNLCK;
3792
3793         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3794         if (data == NULL) {
3795                 nfs_free_seqid(seqid);
3796                 return ERR_PTR(-ENOMEM);
3797         }
3798
3799         msg.rpc_argp = &data->arg,
3800         msg.rpc_resp = &data->res,
3801         task_setup_data.callback_data = data;
3802         return rpc_run_task(&task_setup_data);
3803 }
3804
3805 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3806 {
3807         struct nfs_inode *nfsi = NFS_I(state->inode);
3808         struct nfs_seqid *seqid;
3809         struct nfs4_lock_state *lsp;
3810         struct rpc_task *task;
3811         int status = 0;
3812         unsigned char fl_flags = request->fl_flags;
3813
3814         status = nfs4_set_lock_state(state, request);
3815         /* Unlock _before_ we do the RPC call */
3816         request->fl_flags |= FL_EXISTS;
3817         down_read(&nfsi->rwsem);
3818         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
3819                 up_read(&nfsi->rwsem);
3820                 goto out;
3821         }
3822         up_read(&nfsi->rwsem);
3823         if (status != 0)
3824                 goto out;
3825         /* Is this a delegated lock? */
3826         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3827                 goto out;
3828         lsp = request->fl_u.nfs4_fl.owner;
3829         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3830         status = -ENOMEM;
3831         if (seqid == NULL)
3832                 goto out;
3833         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
3834         status = PTR_ERR(task);
3835         if (IS_ERR(task))
3836                 goto out;
3837         status = nfs4_wait_for_completion_rpc_task(task);
3838         rpc_put_task(task);
3839 out:
3840         request->fl_flags = fl_flags;
3841         return status;
3842 }
3843
3844 struct nfs4_lockdata {
3845         struct nfs_lock_args arg;
3846         struct nfs_lock_res res;
3847         struct nfs4_lock_state *lsp;
3848         struct nfs_open_context *ctx;
3849         struct file_lock fl;
3850         unsigned long timestamp;
3851         int rpc_status;
3852         int cancelled;
3853         struct nfs_server *server;
3854 };
3855
3856 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3857                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3858 {
3859         struct nfs4_lockdata *p;
3860         struct inode *inode = lsp->ls_state->inode;
3861         struct nfs_server *server = NFS_SERVER(inode);
3862
3863         p = kzalloc(sizeof(*p), GFP_KERNEL);
3864         if (p == NULL)
3865                 return NULL;
3866
3867         p->arg.fh = NFS_FH(inode);
3868         p->arg.fl = &p->fl;
3869         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid);
3870         if (p->arg.open_seqid == NULL)
3871                 goto out_free;
3872         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3873         if (p->arg.lock_seqid == NULL)
3874                 goto out_free_seqid;
3875         p->arg.lock_stateid = &lsp->ls_stateid;
3876         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3877         p->arg.lock_owner.id = lsp->ls_id.id;
3878         p->res.lock_seqid = p->arg.lock_seqid;
3879         p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3880         p->lsp = lsp;
3881         p->server = server;
3882         atomic_inc(&lsp->ls_count);
3883         p->ctx = get_nfs_open_context(ctx);
3884         memcpy(&p->fl, fl, sizeof(p->fl));
3885         return p;
3886 out_free_seqid:
3887         nfs_free_seqid(p->arg.open_seqid);
3888 out_free:
3889         kfree(p);
3890         return NULL;
3891 }
3892
3893 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3894 {
3895         struct nfs4_lockdata *data = calldata;
3896         struct nfs4_state *state = data->lsp->ls_state;
3897
3898         dprintk("%s: begin!\n", __func__);
3899         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3900                 return;
3901         /* Do we need to do an open_to_lock_owner? */
3902         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3903                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
3904                         return;
3905                 data->arg.open_stateid = &state->stateid;
3906                 data->arg.new_lock_owner = 1;
3907                 data->res.open_seqid = data->arg.open_seqid;
3908         } else
3909                 data->arg.new_lock_owner = 0;
3910         data->timestamp = jiffies;
3911         if (nfs4_setup_sequence(data->server->nfs_client, &data->arg.seq_args,
3912                                 &data->res.seq_res, 1, task))
3913                 return;
3914         rpc_call_start(task);
3915         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
3916 }
3917
3918 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3919 {
3920         struct nfs4_lockdata *data = calldata;
3921
3922         dprintk("%s: begin!\n", __func__);
3923
3924         nfs4_sequence_done(data->server, &data->res.seq_res,
3925                         task->tk_status);
3926
3927         data->rpc_status = task->tk_status;
3928         if (RPC_ASSASSINATED(task))
3929                 goto out;
3930         if (data->arg.new_lock_owner != 0) {
3931                 if (data->rpc_status == 0)
3932                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3933                 else
3934                         goto out;
3935         }
3936         if (data->rpc_status == 0) {
3937                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3938                                         sizeof(data->lsp->ls_stateid.data));
3939                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3940                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
3941         }
3942 out:
3943         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
3944 }
3945
3946 static void nfs4_lock_release(void *calldata)
3947 {
3948         struct nfs4_lockdata *data = calldata;
3949
3950         dprintk("%s: begin!\n", __func__);
3951         nfs_free_seqid(data->arg.open_seqid);
3952         if (data->cancelled != 0) {
3953                 struct rpc_task *task;
3954                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3955                                 data->arg.lock_seqid);
3956                 if (!IS_ERR(task))
3957                         rpc_put_task(task);
3958                 dprintk("%s: cancelling lock!\n", __func__);
3959         } else
3960                 nfs_free_seqid(data->arg.lock_seqid);
3961         nfs4_put_lock_state(data->lsp);
3962         put_nfs_open_context(data->ctx);
3963         kfree(data);
3964         dprintk("%s: done!\n", __func__);
3965 }
3966
3967 static const struct rpc_call_ops nfs4_lock_ops = {
3968         .rpc_call_prepare = nfs4_lock_prepare,
3969         .rpc_call_done = nfs4_lock_done,
3970         .rpc_release = nfs4_lock_release,
3971 };
3972
3973 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3974 {
3975         struct nfs4_lockdata *data;
3976         struct rpc_task *task;
3977         struct rpc_message msg = {
3978                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3979                 .rpc_cred = state->owner->so_cred,
3980         };
3981         struct rpc_task_setup task_setup_data = {
3982                 .rpc_client = NFS_CLIENT(state->inode),
3983                 .rpc_message = &msg,
3984                 .callback_ops = &nfs4_lock_ops,
3985                 .workqueue = nfsiod_workqueue,
3986                 .flags = RPC_TASK_ASYNC,
3987         };
3988         int ret;
3989
3990         dprintk("%s: begin!\n", __func__);
3991         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
3992                         fl->fl_u.nfs4_fl.owner);
3993         if (data == NULL)
3994                 return -ENOMEM;
3995         if (IS_SETLKW(cmd))
3996                 data->arg.block = 1;
3997         if (reclaim != 0)
3998                 data->arg.reclaim = 1;
3999         msg.rpc_argp = &data->arg,
4000         msg.rpc_resp = &data->res,
4001         task_setup_data.callback_data = data;
4002         task = rpc_run_task(&task_setup_data);
4003         if (IS_ERR(task))
4004                 return PTR_ERR(task);
4005         ret = nfs4_wait_for_completion_rpc_task(task);
4006         if (ret == 0) {
4007                 ret = data->rpc_status;
4008         } else
4009                 data->cancelled = 1;
4010         rpc_put_task(task);
4011         dprintk("%s: done, ret = %d!\n", __func__, ret);
4012         return ret;
4013 }
4014
4015 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4016 {
4017         struct nfs_server *server = NFS_SERVER(state->inode);
4018         struct nfs4_exception exception = { };
4019         int err;
4020
4021         do {
4022                 /* Cache the lock if possible... */
4023                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4024                         return 0;
4025                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
4026                 if (err != -NFS4ERR_DELAY)
4027                         break;
4028                 nfs4_handle_exception(server, err, &exception);
4029         } while (exception.retry);
4030         return err;
4031 }
4032
4033 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4034 {
4035         struct nfs_server *server = NFS_SERVER(state->inode);
4036         struct nfs4_exception exception = { };
4037         int err;
4038
4039         err = nfs4_set_lock_state(state, request);
4040         if (err != 0)
4041                 return err;
4042         do {
4043                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4044                         return 0;
4045                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
4046                 switch (err) {
4047                 default:
4048                         goto out;
4049                 case -NFS4ERR_GRACE:
4050                 case -NFS4ERR_DELAY:
4051                         nfs4_handle_exception(server, err, &exception);
4052                         err = 0;
4053                 }
4054         } while (exception.retry);
4055 out:
4056         return err;
4057 }
4058
4059 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4060 {
4061         struct nfs_inode *nfsi = NFS_I(state->inode);
4062         unsigned char fl_flags = request->fl_flags;
4063         int status;
4064
4065         /* Is this a delegated open? */
4066         status = nfs4_set_lock_state(state, request);
4067         if (status != 0)
4068                 goto out;
4069         request->fl_flags |= FL_ACCESS;
4070         status = do_vfs_lock(request->fl_file, request);
4071         if (status < 0)
4072                 goto out;
4073         down_read(&nfsi->rwsem);
4074         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4075                 /* Yes: cache locks! */
4076                 /* ...but avoid races with delegation recall... */
4077                 request->fl_flags = fl_flags & ~FL_SLEEP;
4078                 status = do_vfs_lock(request->fl_file, request);
4079                 goto out_unlock;
4080         }
4081         status = _nfs4_do_setlk(state, cmd, request, 0);
4082         if (status != 0)
4083                 goto out_unlock;
4084         /* Note: we always want to sleep here! */
4085         request->fl_flags = fl_flags | FL_SLEEP;
4086         if (do_vfs_lock(request->fl_file, request) < 0)
4087                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4088 out_unlock:
4089         up_read(&nfsi->rwsem);
4090 out:
4091         request->fl_flags = fl_flags;
4092         return status;
4093 }
4094
4095 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4096 {
4097         struct nfs4_exception exception = { };
4098         int err;
4099
4100         do {
4101                 err = _nfs4_proc_setlk(state, cmd, request);
4102                 if (err == -NFS4ERR_DENIED)
4103                         err = -EAGAIN;
4104                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4105                                 err, &exception);
4106         } while (exception.retry);
4107         return err;
4108 }
4109
4110 static int
4111 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4112 {
4113         struct nfs_open_context *ctx;
4114         struct nfs4_state *state;
4115         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4116         int status;
4117
4118         /* verify open state */
4119         ctx = nfs_file_open_context(filp);
4120         state = ctx->state;
4121
4122         if (request->fl_start < 0 || request->fl_end < 0)
4123                 return -EINVAL;
4124
4125         if (IS_GETLK(cmd)) {
4126                 if (state != NULL)
4127                         return nfs4_proc_getlk(state, F_GETLK, request);
4128                 return 0;
4129         }
4130
4131         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4132                 return -EINVAL;
4133
4134         if (request->fl_type == F_UNLCK) {
4135                 if (state != NULL)
4136                         return nfs4_proc_unlck(state, cmd, request);
4137                 return 0;
4138         }
4139
4140         if (state == NULL)
4141                 return -ENOLCK;
4142         do {
4143                 status = nfs4_proc_setlk(state, cmd, request);
4144                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4145                         break;
4146                 timeout = nfs4_set_lock_task_retry(timeout);
4147                 status = -ERESTARTSYS;
4148                 if (signalled())
4149                         break;
4150         } while(status < 0);
4151         return status;
4152 }
4153
4154 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4155 {
4156         struct nfs_server *server = NFS_SERVER(state->inode);
4157         struct nfs4_exception exception = { };
4158         int err;
4159
4160         err = nfs4_set_lock_state(state, fl);
4161         if (err != 0)
4162                 goto out;
4163         do {
4164                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
4165                 switch (err) {
4166                         default:
4167                                 printk(KERN_ERR "%s: unhandled error %d.\n",
4168                                                 __func__, err);
4169                         case 0:
4170                         case -ESTALE:
4171                                 goto out;
4172                         case -NFS4ERR_EXPIRED:
4173                         case -NFS4ERR_STALE_CLIENTID:
4174                         case -NFS4ERR_STALE_STATEID:
4175                                 nfs4_schedule_state_recovery(server->nfs_client);
4176                                 goto out;
4177                         case -ERESTARTSYS:
4178                                 /*
4179                                  * The show must go on: exit, but mark the
4180                                  * stateid as needing recovery.
4181                                  */
4182                         case -NFS4ERR_ADMIN_REVOKED:
4183                         case -NFS4ERR_BAD_STATEID:
4184                         case -NFS4ERR_OPENMODE:
4185                                 nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
4186                                 err = 0;
4187                                 goto out;
4188                         case -ENOMEM:
4189                         case -NFS4ERR_DENIED:
4190                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4191                                 err = 0;
4192                                 goto out;
4193                         case -NFS4ERR_DELAY:
4194                                 break;
4195                 }
4196                 err = nfs4_handle_exception(server, err, &exception);
4197         } while (exception.retry);
4198 out:
4199         return err;
4200 }
4201
4202 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4203
4204 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
4205                 size_t buflen, int flags)
4206 {
4207         struct inode *inode = dentry->d_inode;
4208
4209         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
4210                 return -EOPNOTSUPP;
4211
4212         return nfs4_proc_set_acl(inode, buf, buflen);
4213 }
4214
4215 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
4216  * and that's what we'll do for e.g. user attributes that haven't been set.
4217  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
4218  * attributes in kernel-managed attribute namespaces. */
4219 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
4220                 size_t buflen)
4221 {
4222         struct inode *inode = dentry->d_inode;
4223
4224         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
4225                 return -EOPNOTSUPP;
4226
4227         return nfs4_proc_get_acl(inode, buf, buflen);
4228 }
4229
4230 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
4231 {
4232         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
4233
4234         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4235                 return 0;
4236         if (buf && buflen < len)
4237                 return -ERANGE;
4238         if (buf)
4239                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
4240         return len;
4241 }
4242
4243 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4244 {
4245         if (!((fattr->valid & NFS_ATTR_FATTR_FILEID) &&
4246                 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4247                 (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4248                 return;
4249
4250         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4251                 NFS_ATTR_FATTR_NLINK;
4252         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4253         fattr->nlink = 2;
4254 }
4255
4256 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4257                 struct nfs4_fs_locations *fs_locations, struct page *page)
4258 {
4259         struct nfs_server *server = NFS_SERVER(dir);
4260         u32 bitmask[2] = {
4261                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4262                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
4263         };
4264         struct nfs4_fs_locations_arg args = {
4265                 .dir_fh = NFS_FH(dir),
4266                 .name = name,
4267                 .page = page,
4268                 .bitmask = bitmask,
4269         };
4270         struct nfs4_fs_locations_res res = {
4271                 .fs_locations = fs_locations,
4272         };
4273         struct rpc_message msg = {
4274                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4275                 .rpc_argp = &args,
4276                 .rpc_resp = &res,
4277         };
4278         int status;
4279
4280         dprintk("%s: start\n", __func__);
4281         nfs_fattr_init(&fs_locations->fattr);
4282         fs_locations->server = server;
4283         fs_locations->nlocations = 0;
4284         status = nfs4_call_sync(server, &msg, &args, &res, 0);
4285         nfs_fixup_referral_attributes(&fs_locations->fattr);
4286         dprintk("%s: returned status = %d\n", __func__, status);
4287         return status;
4288 }
4289
4290 #ifdef CONFIG_NFS_V4_1
4291 /*
4292  * nfs4_proc_exchange_id()
4293  *
4294  * Since the clientid has expired, all compounds using sessions
4295  * associated with the stale clientid will be returning
4296  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4297  * be in some phase of session reset.
4298  */
4299 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4300 {
4301         nfs4_verifier verifier;
4302         struct nfs41_exchange_id_args args = {
4303                 .client = clp,
4304                 .flags = clp->cl_exchange_flags,
4305         };
4306         struct nfs41_exchange_id_res res = {
4307                 .client = clp,
4308         };
4309         int status;
4310         struct rpc_message msg = {
4311                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4312                 .rpc_argp = &args,
4313                 .rpc_resp = &res,
4314                 .rpc_cred = cred,
4315         };
4316         __be32 *p;
4317
4318         dprintk("--> %s\n", __func__);
4319         BUG_ON(clp == NULL);
4320
4321         /* Remove server-only flags */
4322         args.flags &= ~EXCHGID4_FLAG_CONFIRMED_R;
4323
4324         p = (u32 *)verifier.data;
4325         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4326         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
4327         args.verifier = &verifier;
4328
4329         while (1) {
4330                 args.id_len = scnprintf(args.id, sizeof(args.id),
4331                                         "%s/%s %u",
4332                                         clp->cl_ipaddr,
4333                                         rpc_peeraddr2str(clp->cl_rpcclient,
4334                                                          RPC_DISPLAY_ADDR),
4335                                         clp->cl_id_uniquifier);
4336
4337                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
4338
4339                 if (status != NFS4ERR_CLID_INUSE)
4340                         break;
4341
4342                 if (signalled())
4343                         break;
4344
4345                 if (++clp->cl_id_uniquifier == 0)
4346                         break;
4347         }
4348
4349         dprintk("<-- %s status= %d\n", __func__, status);
4350         return status;
4351 }
4352
4353 struct nfs4_get_lease_time_data {
4354         struct nfs4_get_lease_time_args *args;
4355         struct nfs4_get_lease_time_res *res;
4356         struct nfs_client *clp;
4357 };
4358
4359 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
4360                                         void *calldata)
4361 {
4362         int ret;
4363         struct nfs4_get_lease_time_data *data =
4364                         (struct nfs4_get_lease_time_data *)calldata;
4365
4366         dprintk("--> %s\n", __func__);
4367         /* just setup sequence, do not trigger session recovery
4368            since we're invoked within one */
4369         ret = nfs41_setup_sequence(data->clp->cl_session,
4370                                         &data->args->la_seq_args,
4371                                         &data->res->lr_seq_res, 0, task);
4372
4373         BUG_ON(ret == -EAGAIN);
4374         rpc_call_start(task);
4375         dprintk("<-- %s\n", __func__);
4376 }
4377
4378 /*
4379  * Called from nfs4_state_manager thread for session setup, so don't recover
4380  * from sequence operation or clientid errors.
4381  */
4382 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
4383 {
4384         struct nfs4_get_lease_time_data *data =
4385                         (struct nfs4_get_lease_time_data *)calldata;
4386
4387         dprintk("--> %s\n", __func__);
4388         nfs41_sequence_done(data->clp, &data->res->lr_seq_res, task->tk_status);
4389         switch (task->tk_status) {
4390         case -NFS4ERR_DELAY:
4391         case -NFS4ERR_GRACE:
4392                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
4393                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
4394                 task->tk_status = 0;
4395                 nfs4_restart_rpc(task, data->clp);
4396                 return;
4397         }
4398         dprintk("<-- %s\n", __func__);
4399 }
4400
4401 struct rpc_call_ops nfs4_get_lease_time_ops = {
4402         .rpc_call_prepare = nfs4_get_lease_time_prepare,
4403         .rpc_call_done = nfs4_get_lease_time_done,
4404 };
4405
4406 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
4407 {
4408         struct rpc_task *task;
4409         struct nfs4_get_lease_time_args args;
4410         struct nfs4_get_lease_time_res res = {
4411                 .lr_fsinfo = fsinfo,
4412         };
4413         struct nfs4_get_lease_time_data data = {
4414                 .args = &args,
4415                 .res = &res,
4416                 .clp = clp,
4417         };
4418         struct rpc_message msg = {
4419                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
4420                 .rpc_argp = &args,
4421                 .rpc_resp = &res,
4422         };
4423         struct rpc_task_setup task_setup = {
4424                 .rpc_client = clp->cl_rpcclient,
4425                 .rpc_message = &msg,
4426                 .callback_ops = &nfs4_get_lease_time_ops,
4427                 .callback_data = &data
4428         };
4429         int status;
4430
4431         res.lr_seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
4432         dprintk("--> %s\n", __func__);
4433         task = rpc_run_task(&task_setup);
4434
4435         if (IS_ERR(task))
4436                 status = PTR_ERR(task);
4437         else {
4438                 status = task->tk_status;
4439                 rpc_put_task(task);
4440         }
4441         dprintk("<-- %s return %d\n", __func__, status);
4442
4443         return status;
4444 }
4445
4446 /*
4447  * Reset a slot table
4448  */
4449 static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, int max_slots,
4450                 int old_max_slots, int ivalue)
4451 {
4452         int i;
4453         int ret = 0;
4454
4455         dprintk("--> %s: max_reqs=%u, tbl %p\n", __func__, max_slots, tbl);
4456
4457         /*
4458          * Until we have dynamic slot table adjustment, insist
4459          * upon the same slot table size
4460          */
4461         if (max_slots != old_max_slots) {
4462                 dprintk("%s reset slot table does't match old\n",
4463                         __func__);
4464                 ret = -EINVAL; /*XXX NFS4ERR_REQ_TOO_BIG ? */
4465                 goto out;
4466         }
4467         spin_lock(&tbl->slot_tbl_lock);
4468         for (i = 0; i < max_slots; ++i)
4469                 tbl->slots[i].seq_nr = ivalue;
4470         spin_unlock(&tbl->slot_tbl_lock);
4471         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4472                 tbl, tbl->slots, tbl->max_slots);
4473 out:
4474         dprintk("<-- %s: return %d\n", __func__, ret);
4475         return ret;
4476 }
4477
4478 /*
4479  * Reset the forechannel and backchannel slot tables
4480  */
4481 static int nfs4_reset_slot_tables(struct nfs4_session *session)
4482 {
4483         int status;
4484
4485         status = nfs4_reset_slot_table(&session->fc_slot_table,
4486                         session->fc_attrs.max_reqs,
4487                         session->fc_slot_table.max_slots,
4488                         1);
4489         if (status)
4490                 return status;
4491
4492         status = nfs4_reset_slot_table(&session->bc_slot_table,
4493                         session->bc_attrs.max_reqs,
4494                         session->bc_slot_table.max_slots,
4495                         0);
4496         return status;
4497 }
4498
4499 /* Destroy the slot table */
4500 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
4501 {
4502         if (session->fc_slot_table.slots != NULL) {
4503                 kfree(session->fc_slot_table.slots);
4504                 session->fc_slot_table.slots = NULL;
4505         }
4506         if (session->bc_slot_table.slots != NULL) {
4507                 kfree(session->bc_slot_table.slots);
4508                 session->bc_slot_table.slots = NULL;
4509         }
4510         return;
4511 }
4512
4513 /*
4514  * Initialize slot table
4515  */
4516 static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
4517                 int max_slots, int ivalue)
4518 {
4519         struct nfs4_slot *slot;
4520         int ret = -ENOMEM;
4521
4522         BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);
4523
4524         dprintk("--> %s: max_reqs=%u\n", __func__, max_slots);
4525
4526         slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_KERNEL);
4527         if (!slot)
4528                 goto out;
4529         ret = 0;
4530
4531         spin_lock(&tbl->slot_tbl_lock);
4532         tbl->max_slots = max_slots;
4533         tbl->slots = slot;
4534         tbl->highest_used_slotid = -1;  /* no slot is currently used */
4535         spin_unlock(&tbl->slot_tbl_lock);
4536         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4537                 tbl, tbl->slots, tbl->max_slots);
4538 out:
4539         dprintk("<-- %s: return %d\n", __func__, ret);
4540         return ret;
4541 }
4542
4543 /*
4544  * Initialize the forechannel and backchannel tables
4545  */
4546 static int nfs4_init_slot_tables(struct nfs4_session *session)
4547 {
4548         struct nfs4_slot_table *tbl;
4549         int status = 0;
4550
4551         tbl = &session->fc_slot_table;
4552         if (tbl->slots == NULL) {
4553                 status = nfs4_init_slot_table(tbl,
4554                                 session->fc_attrs.max_reqs, 1);
4555                 if (status)
4556                         return status;
4557         }
4558
4559         tbl = &session->bc_slot_table;
4560         if (tbl->slots == NULL) {
4561                 status = nfs4_init_slot_table(tbl,
4562                                 session->bc_attrs.max_reqs, 0);
4563                 if (status)
4564                         nfs4_destroy_slot_tables(session);
4565         }
4566
4567         return status;
4568 }
4569
4570 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
4571 {
4572         struct nfs4_session *session;
4573         struct nfs4_slot_table *tbl;
4574
4575         session = kzalloc(sizeof(struct nfs4_session), GFP_KERNEL);
4576         if (!session)
4577                 return NULL;
4578
4579         /*
4580          * The create session reply races with the server back
4581          * channel probe. Mark the client NFS_CS_SESSION_INITING
4582          * so that the client back channel can find the
4583          * nfs_client struct
4584          */
4585         clp->cl_cons_state = NFS_CS_SESSION_INITING;
4586         init_completion(&session->complete);
4587
4588         tbl = &session->fc_slot_table;
4589         tbl->highest_used_slotid = -1;
4590         spin_lock_init(&tbl->slot_tbl_lock);
4591         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
4592
4593         tbl = &session->bc_slot_table;
4594         tbl->highest_used_slotid = -1;
4595         spin_lock_init(&tbl->slot_tbl_lock);
4596         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
4597
4598         session->clp = clp;
4599         return session;
4600 }
4601
4602 void nfs4_destroy_session(struct nfs4_session *session)
4603 {
4604         nfs4_proc_destroy_session(session);
4605         dprintk("%s Destroy backchannel for xprt %p\n",
4606                 __func__, session->clp->cl_rpcclient->cl_xprt);
4607         xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
4608                                 NFS41_BC_MIN_CALLBACKS);
4609         nfs4_destroy_slot_tables(session);
4610         kfree(session);
4611 }
4612
4613 /*
4614  * Initialize the values to be used by the client in CREATE_SESSION
4615  * If nfs4_init_session set the fore channel request and response sizes,
4616  * use them.
4617  *
4618  * Set the back channel max_resp_sz_cached to zero to force the client to
4619  * always set csa_cachethis to FALSE because the current implementation
4620  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
4621  */
4622 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
4623 {
4624         struct nfs4_session *session = args->client->cl_session;
4625         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
4626                      mxresp_sz = session->fc_attrs.max_resp_sz;
4627
4628         if (mxrqst_sz == 0)
4629                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
4630         if (mxresp_sz == 0)
4631                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
4632         /* Fore channel attributes */
4633         args->fc_attrs.headerpadsz = 0;
4634         args->fc_attrs.max_rqst_sz = mxrqst_sz;
4635         args->fc_attrs.max_resp_sz = mxresp_sz;
4636         args->fc_attrs.max_resp_sz_cached = mxresp_sz;
4637         args->fc_attrs.max_ops = NFS4_MAX_OPS;
4638         args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;
4639
4640         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
4641                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
4642                 __func__,
4643                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
4644                 args->fc_attrs.max_resp_sz_cached, args->fc_attrs.max_ops,
4645                 args->fc_attrs.max_reqs);
4646
4647         /* Back channel attributes */
4648         args->bc_attrs.headerpadsz = 0;
4649         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
4650         args->bc_attrs.max_resp_sz = PAGE_SIZE;
4651         args->bc_attrs.max_resp_sz_cached = 0;
4652         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
4653         args->bc_attrs.max_reqs = 1;
4654
4655         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
4656                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
4657                 __func__,
4658                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
4659                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
4660                 args->bc_attrs.max_reqs);
4661 }
4662
4663 static int _verify_channel_attr(char *chan, char *attr_name, u32 sent, u32 rcvd)
4664 {
4665         if (rcvd <= sent)
4666                 return 0;
4667         printk(KERN_WARNING "%s: Session INVALID: %s channel %s increased. "
4668                 "sent=%u rcvd=%u\n", __func__, chan, attr_name, sent, rcvd);
4669         return -EINVAL;
4670 }
4671
4672 #define _verify_fore_channel_attr(_name_) \
4673         _verify_channel_attr("fore", #_name_, \
4674                              args->fc_attrs._name_, \
4675                              session->fc_attrs._name_)
4676
4677 #define _verify_back_channel_attr(_name_) \
4678         _verify_channel_attr("back", #_name_, \
4679                              args->bc_attrs._name_, \
4680                              session->bc_attrs._name_)
4681
4682 /*
4683  * The server is not allowed to increase the fore channel header pad size,
4684  * maximum response size, or maximum number of operations.
4685  *
4686  * The back channel attributes are only negotiatied down: We send what the
4687  * (back channel) server insists upon.
4688  */
4689 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
4690                                      struct nfs4_session *session)
4691 {
4692         int ret = 0;
4693
4694         ret |= _verify_fore_channel_attr(headerpadsz);
4695         ret |= _verify_fore_channel_attr(max_resp_sz);
4696         ret |= _verify_fore_channel_attr(max_ops);
4697
4698         ret |= _verify_back_channel_attr(headerpadsz);
4699         ret |= _verify_back_channel_attr(max_rqst_sz);
4700         ret |= _verify_back_channel_attr(max_resp_sz);
4701         ret |= _verify_back_channel_attr(max_resp_sz_cached);
4702         ret |= _verify_back_channel_attr(max_ops);
4703         ret |= _verify_back_channel_attr(max_reqs);
4704
4705         return ret;
4706 }
4707
4708 static int _nfs4_proc_create_session(struct nfs_client *clp)
4709 {
4710         struct nfs4_session *session = clp->cl_session;
4711         struct nfs41_create_session_args args = {
4712                 .client = clp,
4713                 .cb_program = NFS4_CALLBACK,
4714         };
4715         struct nfs41_create_session_res res = {
4716                 .client = clp,
4717         };
4718         struct rpc_message msg = {
4719                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
4720                 .rpc_argp = &args,
4721                 .rpc_resp = &res,
4722         };
4723         int status;
4724
4725         nfs4_init_channel_attrs(&args);
4726         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
4727
4728         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
4729
4730         if (!status)
4731                 /* Verify the session's negotiated channel_attrs values */
4732                 status = nfs4_verify_channel_attrs(&args, session);
4733         if (!status) {
4734                 /* Increment the clientid slot sequence id */
4735                 clp->cl_seqid++;
4736         }
4737
4738         return status;
4739 }
4740
4741 /*
4742  * Issues a CREATE_SESSION operation to the server.
4743  * It is the responsibility of the caller to verify the session is
4744  * expired before calling this routine.
4745  */
4746 int nfs4_proc_create_session(struct nfs_client *clp)
4747 {
4748         int status;
4749         unsigned *ptr;
4750         struct nfs4_session *session = clp->cl_session;
4751
4752         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
4753
4754         status = _nfs4_proc_create_session(clp);
4755         if (status)
4756                 goto out;
4757
4758         /* Init and reset the fore channel */
4759         status = nfs4_init_slot_tables(session);
4760         dprintk("slot table initialization returned %d\n", status);
4761         if (status)
4762                 goto out;
4763         status = nfs4_reset_slot_tables(session);
4764         dprintk("slot table reset returned %d\n", status);
4765         if (status)
4766                 goto out;
4767
4768         ptr = (unsigned *)&session->sess_id.data[0];
4769         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
4770                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
4771 out:
4772         dprintk("<-- %s\n", __func__);
4773         return status;
4774 }
4775
4776 /*
4777  * Issue the over-the-wire RPC DESTROY_SESSION.
4778  * The caller must serialize access to this routine.
4779  */
4780 int nfs4_proc_destroy_session(struct nfs4_session *session)
4781 {
4782         int status = 0;
4783         struct rpc_message msg;
4784
4785         dprintk("--> nfs4_proc_destroy_session\n");
4786
4787         /* session is still being setup */
4788         if (session->clp->cl_cons_state != NFS_CS_READY)
4789                 return status;
4790
4791         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
4792         msg.rpc_argp = session;
4793         msg.rpc_resp = NULL;
4794         msg.rpc_cred = NULL;
4795         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
4796
4797         if (status)
4798                 printk(KERN_WARNING
4799                         "Got error %d from the server on DESTROY_SESSION. "
4800                         "Session has been destroyed regardless...\n", status);
4801
4802         dprintk("<-- nfs4_proc_destroy_session\n");
4803         return status;
4804 }
4805
4806 int nfs4_init_session(struct nfs_server *server)
4807 {
4808         struct nfs_client *clp = server->nfs_client;
4809         struct nfs4_session *session;
4810         int ret;
4811
4812         if (!nfs4_has_session(clp))
4813                 return 0;
4814
4815         session = clp->cl_session;
4816         session->fc_attrs.max_rqst_sz = server->wsize + nfs41_maxwrite_overhead;
4817         session->fc_attrs.max_resp_sz = server->rsize + nfs41_maxread_overhead;
4818
4819         ret = nfs4_recover_expired_lease(server);
4820         if (!ret)
4821                 ret = nfs4_check_client_ready(clp);
4822         return ret;
4823 }
4824
4825 /*
4826  * Renew the cl_session lease.
4827  */
4828 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
4829 {
4830         struct nfs4_sequence_args args;
4831         struct nfs4_sequence_res res;
4832
4833         struct rpc_message msg = {
4834                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
4835                 .rpc_argp = &args,
4836                 .rpc_resp = &res,
4837                 .rpc_cred = cred,
4838         };
4839
4840         args.sa_cache_this = 0;
4841
4842         return nfs4_call_sync_sequence(clp, clp->cl_rpcclient, &msg, &args,
4843                                        &res, 0);
4844 }
4845
4846 void nfs41_sequence_call_done(struct rpc_task *task, void *data)
4847 {
4848         struct nfs_client *clp = (struct nfs_client *)data;
4849
4850         nfs41_sequence_done(clp, task->tk_msg.rpc_resp, task->tk_status);
4851
4852         if (task->tk_status < 0) {
4853                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
4854
4855                 if (_nfs4_async_handle_error(task, NULL, clp, NULL)
4856                                                                 == -EAGAIN) {
4857                         nfs4_restart_rpc(task, clp);
4858                         return;
4859                 }
4860         }
4861         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
4862
4863         kfree(task->tk_msg.rpc_argp);
4864         kfree(task->tk_msg.rpc_resp);
4865
4866         dprintk("<-- %s\n", __func__);
4867 }
4868
4869 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
4870 {
4871         struct nfs_client *clp;
4872         struct nfs4_sequence_args *args;
4873         struct nfs4_sequence_res *res;
4874
4875         clp = (struct nfs_client *)data;
4876         args = task->tk_msg.rpc_argp;
4877         res = task->tk_msg.rpc_resp;
4878
4879         if (nfs4_setup_sequence(clp, args, res, 0, task))
4880                 return;
4881         rpc_call_start(task);
4882 }
4883
4884 static const struct rpc_call_ops nfs41_sequence_ops = {
4885         .rpc_call_done = nfs41_sequence_call_done,
4886         .rpc_call_prepare = nfs41_sequence_prepare,
4887 };
4888
4889 static int nfs41_proc_async_sequence(struct nfs_client *clp,
4890                                      struct rpc_cred *cred)
4891 {
4892         struct nfs4_sequence_args *args;
4893         struct nfs4_sequence_res *res;
4894         struct rpc_message msg = {
4895                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
4896                 .rpc_cred = cred,
4897         };
4898
4899         args = kzalloc(sizeof(*args), GFP_KERNEL);
4900         if (!args)
4901                 return -ENOMEM;
4902         res = kzalloc(sizeof(*res), GFP_KERNEL);
4903         if (!res) {
4904                 kfree(args);
4905                 return -ENOMEM;
4906         }
4907         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
4908         msg.rpc_argp = args;
4909         msg.rpc_resp = res;
4910
4911         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
4912                               &nfs41_sequence_ops, (void *)clp);
4913 }
4914
4915 struct nfs4_reclaim_complete_data {
4916         struct nfs_client *clp;
4917         struct nfs41_reclaim_complete_args arg;
4918         struct nfs41_reclaim_complete_res res;
4919 };
4920
4921 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
4922 {
4923         struct nfs4_reclaim_complete_data *calldata = data;
4924
4925         if (nfs4_setup_sequence(calldata->clp, &calldata->arg.seq_args,
4926                                 &calldata->res.seq_res, 0, task))
4927                 return;
4928
4929         rpc_call_start(task);
4930 }
4931
4932 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
4933 {
4934         struct nfs4_reclaim_complete_data *calldata = data;
4935         struct nfs_client *clp = calldata->clp;
4936         struct nfs4_sequence_res *res = &calldata->res.seq_res;
4937
4938         dprintk("--> %s\n", __func__);
4939         nfs41_sequence_done(clp, res, task->tk_status);
4940         switch (task->tk_status) {
4941         case 0:
4942         case -NFS4ERR_COMPLETE_ALREADY:
4943                 break;
4944         case -NFS4ERR_BADSESSION:
4945         case -NFS4ERR_DEADSESSION:
4946                 /*
4947                  * Handle the session error, but do not retry the operation, as
4948                  * we have no way of telling whether the clientid had to be
4949                  * reset before we got our reply.  If reset, a new wave of
4950                  * reclaim operations will follow, containing their own reclaim
4951                  * complete.  We don't want our retry to get on the way of
4952                  * recovery by incorrectly indicating to the server that we're
4953                  * done reclaiming state since the process had to be restarted.
4954                  */
4955                 _nfs4_async_handle_error(task, NULL, clp, NULL);
4956                 break;
4957         default:
4958                 if (_nfs4_async_handle_error(
4959                                 task, NULL, clp, NULL) == -EAGAIN) {
4960                         rpc_restart_call_prepare(task);
4961                         return;
4962                 }
4963         }
4964
4965         dprintk("<-- %s\n", __func__);
4966 }
4967
4968 static void nfs4_free_reclaim_complete_data(void *data)
4969 {
4970         struct nfs4_reclaim_complete_data *calldata = data;
4971
4972         kfree(calldata);
4973 }
4974
4975 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
4976         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
4977         .rpc_call_done = nfs4_reclaim_complete_done,
4978         .rpc_release = nfs4_free_reclaim_complete_data,
4979 };
4980
4981 /*
4982  * Issue a global reclaim complete.
4983  */
4984 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
4985 {
4986         struct nfs4_reclaim_complete_data *calldata;
4987         struct rpc_task *task;
4988         struct rpc_message msg = {
4989                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
4990         };
4991         struct rpc_task_setup task_setup_data = {
4992                 .rpc_client = clp->cl_rpcclient,
4993                 .rpc_message = &msg,
4994                 .callback_ops = &nfs4_reclaim_complete_call_ops,
4995                 .flags = RPC_TASK_ASYNC,
4996         };
4997         int status = -ENOMEM;
4998
4999         dprintk("--> %s\n", __func__);
5000         calldata = kzalloc(sizeof(*calldata), GFP_KERNEL);
5001         if (calldata == NULL)
5002                 goto out;
5003         calldata->clp = clp;
5004         calldata->arg.one_fs = 0;
5005         calldata->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
5006
5007         msg.rpc_argp = &calldata->arg;
5008         msg.rpc_resp = &calldata->res;
5009         task_setup_data.callback_data = calldata;
5010         task = rpc_run_task(&task_setup_data);
5011         if (IS_ERR(task))
5012                 status = PTR_ERR(task);
5013         rpc_put_task(task);
5014 out:
5015         dprintk("<-- %s status=%d\n", __func__, status);
5016         return status;
5017 }
5018 #endif /* CONFIG_NFS_V4_1 */
5019
5020 struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
5021         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5022         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5023         .recover_open   = nfs4_open_reclaim,
5024         .recover_lock   = nfs4_lock_reclaim,
5025         .establish_clid = nfs4_init_clientid,
5026         .get_clid_cred  = nfs4_get_setclientid_cred,
5027 };
5028
5029 #if defined(CONFIG_NFS_V4_1)
5030 struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
5031         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5032         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5033         .recover_open   = nfs4_open_reclaim,
5034         .recover_lock   = nfs4_lock_reclaim,
5035         .establish_clid = nfs41_init_clientid,
5036         .get_clid_cred  = nfs4_get_exchange_id_cred,
5037         .reclaim_complete = nfs41_proc_reclaim_complete,
5038 };
5039 #endif /* CONFIG_NFS_V4_1 */
5040
5041 struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
5042         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5043         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5044         .recover_open   = nfs4_open_expired,
5045         .recover_lock   = nfs4_lock_expired,
5046         .establish_clid = nfs4_init_clientid,
5047         .get_clid_cred  = nfs4_get_setclientid_cred,
5048 };
5049
5050 #if defined(CONFIG_NFS_V4_1)
5051 struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
5052         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5053         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5054         .recover_open   = nfs4_open_expired,
5055         .recover_lock   = nfs4_lock_expired,
5056         .establish_clid = nfs41_init_clientid,
5057         .get_clid_cred  = nfs4_get_exchange_id_cred,
5058 };
5059 #endif /* CONFIG_NFS_V4_1 */
5060
5061 struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
5062         .sched_state_renewal = nfs4_proc_async_renew,
5063         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
5064         .renew_lease = nfs4_proc_renew,
5065 };
5066
5067 #if defined(CONFIG_NFS_V4_1)
5068 struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
5069         .sched_state_renewal = nfs41_proc_async_sequence,
5070         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
5071         .renew_lease = nfs4_proc_sequence,
5072 };
5073 #endif
5074
5075 /*
5076  * Per minor version reboot and network partition recovery ops
5077  */
5078
5079 struct nfs4_state_recovery_ops *nfs4_reboot_recovery_ops[] = {
5080         &nfs40_reboot_recovery_ops,
5081 #if defined(CONFIG_NFS_V4_1)
5082         &nfs41_reboot_recovery_ops,
5083 #endif
5084 };
5085
5086 struct nfs4_state_recovery_ops *nfs4_nograce_recovery_ops[] = {
5087         &nfs40_nograce_recovery_ops,
5088 #if defined(CONFIG_NFS_V4_1)
5089         &nfs41_nograce_recovery_ops,
5090 #endif
5091 };
5092
5093 struct nfs4_state_maintenance_ops *nfs4_state_renewal_ops[] = {
5094         &nfs40_state_renewal_ops,
5095 #if defined(CONFIG_NFS_V4_1)
5096         &nfs41_state_renewal_ops,
5097 #endif
5098 };
5099
5100 static const struct inode_operations nfs4_file_inode_operations = {
5101         .permission     = nfs_permission,
5102         .getattr        = nfs_getattr,
5103         .setattr        = nfs_setattr,
5104         .getxattr       = nfs4_getxattr,
5105         .setxattr       = nfs4_setxattr,
5106         .listxattr      = nfs4_listxattr,
5107 };
5108
5109 const struct nfs_rpc_ops nfs_v4_clientops = {
5110         .version        = 4,                    /* protocol version */
5111         .dentry_ops     = &nfs4_dentry_operations,
5112         .dir_inode_ops  = &nfs4_dir_inode_operations,
5113         .file_inode_ops = &nfs4_file_inode_operations,
5114         .getroot        = nfs4_proc_get_root,
5115         .getattr        = nfs4_proc_getattr,
5116         .setattr        = nfs4_proc_setattr,
5117         .lookupfh       = nfs4_proc_lookupfh,
5118         .lookup         = nfs4_proc_lookup,
5119         .access         = nfs4_proc_access,
5120         .readlink       = nfs4_proc_readlink,
5121         .create         = nfs4_proc_create,
5122         .remove         = nfs4_proc_remove,
5123         .unlink_setup   = nfs4_proc_unlink_setup,
5124         .unlink_done    = nfs4_proc_unlink_done,
5125         .rename         = nfs4_proc_rename,
5126         .link           = nfs4_proc_link,
5127         .symlink        = nfs4_proc_symlink,
5128         .mkdir          = nfs4_proc_mkdir,
5129         .rmdir          = nfs4_proc_remove,
5130         .readdir        = nfs4_proc_readdir,
5131         .mknod          = nfs4_proc_mknod,
5132         .statfs         = nfs4_proc_statfs,
5133         .fsinfo         = nfs4_proc_fsinfo,
5134         .pathconf       = nfs4_proc_pathconf,
5135         .set_capabilities = nfs4_server_capabilities,
5136         .decode_dirent  = nfs4_decode_dirent,
5137         .read_setup     = nfs4_proc_read_setup,
5138         .read_done      = nfs4_read_done,
5139         .write_setup    = nfs4_proc_write_setup,
5140         .write_done     = nfs4_write_done,
5141         .commit_setup   = nfs4_proc_commit_setup,
5142         .commit_done    = nfs4_commit_done,
5143         .lock           = nfs4_proc_lock,
5144         .clear_acl_cache = nfs4_zap_acl_attr,
5145         .close_context  = nfs4_close_context,
5146 };
5147
5148 /*
5149  * Local variables:
5150  *  c-basic-offset: 8
5151  * End:
5152  */