NFSv41: Clean up slot table management
[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 static void
323 nfs4_free_slot(struct nfs4_slot_table *tbl, u8 free_slotid)
324 {
325         int slotid = free_slotid;
326
327         spin_lock(&tbl->slot_tbl_lock);
328         /* clear used bit in bitmap */
329         __clear_bit(slotid, tbl->used_slots);
330
331         /* update highest_used_slotid when it is freed */
332         if (slotid == tbl->highest_used_slotid) {
333                 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
334                 if (slotid >= 0 && slotid < tbl->max_slots)
335                         tbl->highest_used_slotid = slotid;
336                 else
337                         tbl->highest_used_slotid = -1;
338         }
339         spin_unlock(&tbl->slot_tbl_lock);
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         } else {
355                 nfs4_free_slot(tbl, res->sr_slotid);
356                 res->sr_slotid = NFS4_MAX_SLOT_TABLE;
357         }
358
359         /* Signal state manager thread if session is drained */
360         if (test_bit(NFS4CLNT_SESSION_DRAINING, &clp->cl_state)) {
361                 spin_lock(&tbl->slot_tbl_lock);
362                 if (tbl->highest_used_slotid == -1) {
363                         dprintk("%s COMPLETE: Session Drained\n", __func__);
364                         complete(&clp->cl_session->complete);
365                 }
366                 spin_unlock(&tbl->slot_tbl_lock);
367         } else {
368                 rpc_wake_up_next(&tbl->slot_tbl_waitq);
369         }
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                 dprintk("%s Schedule Session Reset\n", __func__);
472                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
473                 nfs4_schedule_state_manager(session->clp);
474                 spin_unlock(&tbl->slot_tbl_lock);
475                 return -EAGAIN;
476         }
477
478         slotid = nfs4_find_slot(tbl, task);
479         if (slotid == NFS4_MAX_SLOT_TABLE) {
480                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
481                 spin_unlock(&tbl->slot_tbl_lock);
482                 dprintk("<-- %s: no free slots\n", __func__);
483                 return -EAGAIN;
484         }
485         spin_unlock(&tbl->slot_tbl_lock);
486
487         slot = tbl->slots + slotid;
488         args->sa_session = session;
489         args->sa_slotid = slotid;
490         args->sa_cache_this = cache_reply;
491
492         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
493
494         res->sr_session = session;
495         res->sr_slotid = slotid;
496         res->sr_renewal_time = jiffies;
497         /*
498          * sr_status is only set in decode_sequence, and so will remain
499          * set to 1 if an rpc level failure occurs.
500          */
501         res->sr_status = 1;
502         return 0;
503 }
504
505 int nfs4_setup_sequence(struct nfs_client *clp,
506                         struct nfs4_sequence_args *args,
507                         struct nfs4_sequence_res *res,
508                         int cache_reply,
509                         struct rpc_task *task)
510 {
511         int ret = 0;
512
513         dprintk("--> %s clp %p session %p sr_slotid %d\n",
514                 __func__, clp, clp->cl_session, res->sr_slotid);
515
516         if (!nfs4_has_session(clp))
517                 goto out;
518         ret = nfs41_setup_sequence(clp->cl_session, args, res, cache_reply,
519                                    task);
520         if (ret && ret != -EAGAIN) {
521                 /* terminate rpc task */
522                 task->tk_status = ret;
523                 task->tk_action = NULL;
524         }
525 out:
526         dprintk("<-- %s status=%d\n", __func__, ret);
527         return ret;
528 }
529
530 struct nfs41_call_sync_data {
531         struct nfs_client *clp;
532         struct nfs4_sequence_args *seq_args;
533         struct nfs4_sequence_res *seq_res;
534         int cache_reply;
535 };
536
537 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
538 {
539         struct nfs41_call_sync_data *data = calldata;
540
541         dprintk("--> %s data->clp->cl_session %p\n", __func__,
542                 data->clp->cl_session);
543         if (nfs4_setup_sequence(data->clp, data->seq_args,
544                                 data->seq_res, data->cache_reply, task))
545                 return;
546         rpc_call_start(task);
547 }
548
549 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
550 {
551         struct nfs41_call_sync_data *data = calldata;
552
553         nfs41_sequence_done(data->clp, data->seq_res, task->tk_status);
554 }
555
556 struct rpc_call_ops nfs41_call_sync_ops = {
557         .rpc_call_prepare = nfs41_call_sync_prepare,
558         .rpc_call_done = nfs41_call_sync_done,
559 };
560
561 static int nfs4_call_sync_sequence(struct nfs_client *clp,
562                                    struct rpc_clnt *clnt,
563                                    struct rpc_message *msg,
564                                    struct nfs4_sequence_args *args,
565                                    struct nfs4_sequence_res *res,
566                                    int cache_reply)
567 {
568         int ret;
569         struct rpc_task *task;
570         struct nfs41_call_sync_data data = {
571                 .clp = clp,
572                 .seq_args = args,
573                 .seq_res = res,
574                 .cache_reply = cache_reply,
575         };
576         struct rpc_task_setup task_setup = {
577                 .rpc_client = clnt,
578                 .rpc_message = msg,
579                 .callback_ops = &nfs41_call_sync_ops,
580                 .callback_data = &data
581         };
582
583         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
584         task = rpc_run_task(&task_setup);
585         if (IS_ERR(task))
586                 ret = PTR_ERR(task);
587         else {
588                 ret = task->tk_status;
589                 rpc_put_task(task);
590         }
591         return ret;
592 }
593
594 int _nfs4_call_sync_session(struct nfs_server *server,
595                             struct rpc_message *msg,
596                             struct nfs4_sequence_args *args,
597                             struct nfs4_sequence_res *res,
598                             int cache_reply)
599 {
600         return nfs4_call_sync_sequence(server->nfs_client, server->client,
601                                        msg, args, res, cache_reply);
602 }
603
604 #endif /* CONFIG_NFS_V4_1 */
605
606 int _nfs4_call_sync(struct nfs_server *server,
607                     struct rpc_message *msg,
608                     struct nfs4_sequence_args *args,
609                     struct nfs4_sequence_res *res,
610                     int cache_reply)
611 {
612         args->sa_session = res->sr_session = NULL;
613         return rpc_call_sync(server->client, msg, 0);
614 }
615
616 #define nfs4_call_sync(server, msg, args, res, cache_reply) \
617         (server)->nfs_client->cl_call_sync((server), (msg), &(args)->seq_args, \
618                         &(res)->seq_res, (cache_reply))
619
620 static void nfs4_sequence_done(const struct nfs_server *server,
621                                struct nfs4_sequence_res *res, int rpc_status)
622 {
623 #ifdef CONFIG_NFS_V4_1
624         if (nfs4_has_session(server->nfs_client))
625                 nfs41_sequence_done(server->nfs_client, res, rpc_status);
626 #endif /* CONFIG_NFS_V4_1 */
627 }
628
629 void nfs4_restart_rpc(struct rpc_task *task, const struct nfs_client *clp)
630 {
631 #ifdef CONFIG_NFS_V4_1
632         if (nfs4_has_session(clp)) {
633                 rpc_restart_call_prepare(task);
634                 return;
635         }
636 #endif /* CONFIG_NFS_V4_1 */
637         rpc_restart_call(task);
638 }
639
640 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
641 {
642         struct nfs_inode *nfsi = NFS_I(dir);
643
644         spin_lock(&dir->i_lock);
645         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
646         if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
647                 nfs_force_lookup_revalidate(dir);
648         nfsi->change_attr = cinfo->after;
649         spin_unlock(&dir->i_lock);
650 }
651
652 struct nfs4_opendata {
653         struct kref kref;
654         struct nfs_openargs o_arg;
655         struct nfs_openres o_res;
656         struct nfs_open_confirmargs c_arg;
657         struct nfs_open_confirmres c_res;
658         struct nfs_fattr f_attr;
659         struct nfs_fattr dir_attr;
660         struct path path;
661         struct dentry *dir;
662         struct nfs4_state_owner *owner;
663         struct nfs4_state *state;
664         struct iattr attrs;
665         unsigned long timestamp;
666         unsigned int rpc_done : 1;
667         int rpc_status;
668         int cancelled;
669 };
670
671
672 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
673 {
674         p->o_res.f_attr = &p->f_attr;
675         p->o_res.dir_attr = &p->dir_attr;
676         p->o_res.seqid = p->o_arg.seqid;
677         p->c_res.seqid = p->c_arg.seqid;
678         p->o_res.server = p->o_arg.server;
679         nfs_fattr_init(&p->f_attr);
680         nfs_fattr_init(&p->dir_attr);
681         p->o_res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
682 }
683
684 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
685                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
686                 const struct iattr *attrs)
687 {
688         struct dentry *parent = dget_parent(path->dentry);
689         struct inode *dir = parent->d_inode;
690         struct nfs_server *server = NFS_SERVER(dir);
691         struct nfs4_opendata *p;
692
693         p = kzalloc(sizeof(*p), GFP_KERNEL);
694         if (p == NULL)
695                 goto err;
696         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
697         if (p->o_arg.seqid == NULL)
698                 goto err_free;
699         p->path.mnt = mntget(path->mnt);
700         p->path.dentry = dget(path->dentry);
701         p->dir = parent;
702         p->owner = sp;
703         atomic_inc(&sp->so_count);
704         p->o_arg.fh = NFS_FH(dir);
705         p->o_arg.open_flags = flags;
706         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
707         p->o_arg.clientid = server->nfs_client->cl_clientid;
708         p->o_arg.id = sp->so_owner_id.id;
709         p->o_arg.name = &p->path.dentry->d_name;
710         p->o_arg.server = server;
711         p->o_arg.bitmask = server->attr_bitmask;
712         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
713         if (flags & O_EXCL) {
714                 if (nfs4_has_persistent_session(server->nfs_client)) {
715                         /* GUARDED */
716                         p->o_arg.u.attrs = &p->attrs;
717                         memcpy(&p->attrs, attrs, sizeof(p->attrs));
718                 } else { /* EXCLUSIVE4_1 */
719                         u32 *s = (u32 *) p->o_arg.u.verifier.data;
720                         s[0] = jiffies;
721                         s[1] = current->pid;
722                 }
723         } else if (flags & O_CREAT) {
724                 p->o_arg.u.attrs = &p->attrs;
725                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
726         }
727         p->c_arg.fh = &p->o_res.fh;
728         p->c_arg.stateid = &p->o_res.stateid;
729         p->c_arg.seqid = p->o_arg.seqid;
730         nfs4_init_opendata_res(p);
731         kref_init(&p->kref);
732         return p;
733 err_free:
734         kfree(p);
735 err:
736         dput(parent);
737         return NULL;
738 }
739
740 static void nfs4_opendata_free(struct kref *kref)
741 {
742         struct nfs4_opendata *p = container_of(kref,
743                         struct nfs4_opendata, kref);
744
745         nfs_free_seqid(p->o_arg.seqid);
746         if (p->state != NULL)
747                 nfs4_put_open_state(p->state);
748         nfs4_put_state_owner(p->owner);
749         dput(p->dir);
750         path_put(&p->path);
751         kfree(p);
752 }
753
754 static void nfs4_opendata_put(struct nfs4_opendata *p)
755 {
756         if (p != NULL)
757                 kref_put(&p->kref, nfs4_opendata_free);
758 }
759
760 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
761 {
762         int ret;
763
764         ret = rpc_wait_for_completion_task(task);
765         return ret;
766 }
767
768 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
769 {
770         int ret = 0;
771
772         if (open_mode & O_EXCL)
773                 goto out;
774         switch (mode & (FMODE_READ|FMODE_WRITE)) {
775                 case FMODE_READ:
776                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0;
777                         break;
778                 case FMODE_WRITE:
779                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0;
780                         break;
781                 case FMODE_READ|FMODE_WRITE:
782                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0;
783         }
784 out:
785         return ret;
786 }
787
788 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
789 {
790         if ((delegation->type & fmode) != fmode)
791                 return 0;
792         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
793                 return 0;
794         nfs_mark_delegation_referenced(delegation);
795         return 1;
796 }
797
798 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
799 {
800         switch (fmode) {
801                 case FMODE_WRITE:
802                         state->n_wronly++;
803                         break;
804                 case FMODE_READ:
805                         state->n_rdonly++;
806                         break;
807                 case FMODE_READ|FMODE_WRITE:
808                         state->n_rdwr++;
809         }
810         nfs4_state_set_mode_locked(state, state->state | fmode);
811 }
812
813 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
814 {
815         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
816                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
817         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
818         switch (fmode) {
819                 case FMODE_READ:
820                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
821                         break;
822                 case FMODE_WRITE:
823                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
824                         break;
825                 case FMODE_READ|FMODE_WRITE:
826                         set_bit(NFS_O_RDWR_STATE, &state->flags);
827         }
828 }
829
830 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
831 {
832         write_seqlock(&state->seqlock);
833         nfs_set_open_stateid_locked(state, stateid, fmode);
834         write_sequnlock(&state->seqlock);
835 }
836
837 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
838 {
839         /*
840          * Protect the call to nfs4_state_set_mode_locked and
841          * serialise the stateid update
842          */
843         write_seqlock(&state->seqlock);
844         if (deleg_stateid != NULL) {
845                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
846                 set_bit(NFS_DELEGATED_STATE, &state->flags);
847         }
848         if (open_stateid != NULL)
849                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
850         write_sequnlock(&state->seqlock);
851         spin_lock(&state->owner->so_lock);
852         update_open_stateflags(state, fmode);
853         spin_unlock(&state->owner->so_lock);
854 }
855
856 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
857 {
858         struct nfs_inode *nfsi = NFS_I(state->inode);
859         struct nfs_delegation *deleg_cur;
860         int ret = 0;
861
862         fmode &= (FMODE_READ|FMODE_WRITE);
863
864         rcu_read_lock();
865         deleg_cur = rcu_dereference(nfsi->delegation);
866         if (deleg_cur == NULL)
867                 goto no_delegation;
868
869         spin_lock(&deleg_cur->lock);
870         if (nfsi->delegation != deleg_cur ||
871             (deleg_cur->type & fmode) != fmode)
872                 goto no_delegation_unlock;
873
874         if (delegation == NULL)
875                 delegation = &deleg_cur->stateid;
876         else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
877                 goto no_delegation_unlock;
878
879         nfs_mark_delegation_referenced(deleg_cur);
880         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
881         ret = 1;
882 no_delegation_unlock:
883         spin_unlock(&deleg_cur->lock);
884 no_delegation:
885         rcu_read_unlock();
886
887         if (!ret && open_stateid != NULL) {
888                 __update_open_stateid(state, open_stateid, NULL, fmode);
889                 ret = 1;
890         }
891
892         return ret;
893 }
894
895
896 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
897 {
898         struct nfs_delegation *delegation;
899
900         rcu_read_lock();
901         delegation = rcu_dereference(NFS_I(inode)->delegation);
902         if (delegation == NULL || (delegation->type & fmode) == fmode) {
903                 rcu_read_unlock();
904                 return;
905         }
906         rcu_read_unlock();
907         nfs_inode_return_delegation(inode);
908 }
909
910 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
911 {
912         struct nfs4_state *state = opendata->state;
913         struct nfs_inode *nfsi = NFS_I(state->inode);
914         struct nfs_delegation *delegation;
915         int open_mode = opendata->o_arg.open_flags & O_EXCL;
916         fmode_t fmode = opendata->o_arg.fmode;
917         nfs4_stateid stateid;
918         int ret = -EAGAIN;
919
920         for (;;) {
921                 if (can_open_cached(state, fmode, open_mode)) {
922                         spin_lock(&state->owner->so_lock);
923                         if (can_open_cached(state, fmode, open_mode)) {
924                                 update_open_stateflags(state, fmode);
925                                 spin_unlock(&state->owner->so_lock);
926                                 goto out_return_state;
927                         }
928                         spin_unlock(&state->owner->so_lock);
929                 }
930                 rcu_read_lock();
931                 delegation = rcu_dereference(nfsi->delegation);
932                 if (delegation == NULL ||
933                     !can_open_delegated(delegation, fmode)) {
934                         rcu_read_unlock();
935                         break;
936                 }
937                 /* Save the delegation */
938                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
939                 rcu_read_unlock();
940                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
941                 if (ret != 0)
942                         goto out;
943                 ret = -EAGAIN;
944
945                 /* Try to update the stateid using the delegation */
946                 if (update_open_stateid(state, NULL, &stateid, fmode))
947                         goto out_return_state;
948         }
949 out:
950         return ERR_PTR(ret);
951 out_return_state:
952         atomic_inc(&state->count);
953         return state;
954 }
955
956 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
957 {
958         struct inode *inode;
959         struct nfs4_state *state = NULL;
960         struct nfs_delegation *delegation;
961         int ret;
962
963         if (!data->rpc_done) {
964                 state = nfs4_try_open_cached(data);
965                 goto out;
966         }
967
968         ret = -EAGAIN;
969         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
970                 goto err;
971         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
972         ret = PTR_ERR(inode);
973         if (IS_ERR(inode))
974                 goto err;
975         ret = -ENOMEM;
976         state = nfs4_get_open_state(inode, data->owner);
977         if (state == NULL)
978                 goto err_put_inode;
979         if (data->o_res.delegation_type != 0) {
980                 int delegation_flags = 0;
981
982                 rcu_read_lock();
983                 delegation = rcu_dereference(NFS_I(inode)->delegation);
984                 if (delegation)
985                         delegation_flags = delegation->flags;
986                 rcu_read_unlock();
987                 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
988                         nfs_inode_set_delegation(state->inode,
989                                         data->owner->so_cred,
990                                         &data->o_res);
991                 else
992                         nfs_inode_reclaim_delegation(state->inode,
993                                         data->owner->so_cred,
994                                         &data->o_res);
995         }
996
997         update_open_stateid(state, &data->o_res.stateid, NULL,
998                         data->o_arg.fmode);
999         iput(inode);
1000 out:
1001         return state;
1002 err_put_inode:
1003         iput(inode);
1004 err:
1005         return ERR_PTR(ret);
1006 }
1007
1008 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1009 {
1010         struct nfs_inode *nfsi = NFS_I(state->inode);
1011         struct nfs_open_context *ctx;
1012
1013         spin_lock(&state->inode->i_lock);
1014         list_for_each_entry(ctx, &nfsi->open_files, list) {
1015                 if (ctx->state != state)
1016                         continue;
1017                 get_nfs_open_context(ctx);
1018                 spin_unlock(&state->inode->i_lock);
1019                 return ctx;
1020         }
1021         spin_unlock(&state->inode->i_lock);
1022         return ERR_PTR(-ENOENT);
1023 }
1024
1025 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1026 {
1027         struct nfs4_opendata *opendata;
1028
1029         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, 0, NULL);
1030         if (opendata == NULL)
1031                 return ERR_PTR(-ENOMEM);
1032         opendata->state = state;
1033         atomic_inc(&state->count);
1034         return opendata;
1035 }
1036
1037 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1038 {
1039         struct nfs4_state *newstate;
1040         int ret;
1041
1042         opendata->o_arg.open_flags = 0;
1043         opendata->o_arg.fmode = fmode;
1044         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1045         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1046         nfs4_init_opendata_res(opendata);
1047         ret = _nfs4_proc_open(opendata);
1048         if (ret != 0)
1049                 return ret; 
1050         newstate = nfs4_opendata_to_nfs4_state(opendata);
1051         if (IS_ERR(newstate))
1052                 return PTR_ERR(newstate);
1053         nfs4_close_state(&opendata->path, newstate, fmode);
1054         *res = newstate;
1055         return 0;
1056 }
1057
1058 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1059 {
1060         struct nfs4_state *newstate;
1061         int ret;
1062
1063         /* memory barrier prior to reading state->n_* */
1064         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1065         smp_rmb();
1066         if (state->n_rdwr != 0) {
1067                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1068                 if (ret != 0)
1069                         return ret;
1070                 if (newstate != state)
1071                         return -ESTALE;
1072         }
1073         if (state->n_wronly != 0) {
1074                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1075                 if (ret != 0)
1076                         return ret;
1077                 if (newstate != state)
1078                         return -ESTALE;
1079         }
1080         if (state->n_rdonly != 0) {
1081                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1082                 if (ret != 0)
1083                         return ret;
1084                 if (newstate != state)
1085                         return -ESTALE;
1086         }
1087         /*
1088          * We may have performed cached opens for all three recoveries.
1089          * Check if we need to update the current stateid.
1090          */
1091         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1092             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
1093                 write_seqlock(&state->seqlock);
1094                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1095                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
1096                 write_sequnlock(&state->seqlock);
1097         }
1098         return 0;
1099 }
1100
1101 /*
1102  * OPEN_RECLAIM:
1103  *      reclaim state on the server after a reboot.
1104  */
1105 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1106 {
1107         struct nfs_delegation *delegation;
1108         struct nfs4_opendata *opendata;
1109         fmode_t delegation_type = 0;
1110         int status;
1111
1112         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1113         if (IS_ERR(opendata))
1114                 return PTR_ERR(opendata);
1115         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1116         opendata->o_arg.fh = NFS_FH(state->inode);
1117         rcu_read_lock();
1118         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1119         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1120                 delegation_type = delegation->type;
1121         rcu_read_unlock();
1122         opendata->o_arg.u.delegation_type = delegation_type;
1123         status = nfs4_open_recover(opendata, state);
1124         nfs4_opendata_put(opendata);
1125         return status;
1126 }
1127
1128 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1129 {
1130         struct nfs_server *server = NFS_SERVER(state->inode);
1131         struct nfs4_exception exception = { };
1132         int err;
1133         do {
1134                 err = _nfs4_do_open_reclaim(ctx, state);
1135                 if (err != -NFS4ERR_DELAY)
1136                         break;
1137                 nfs4_handle_exception(server, err, &exception);
1138         } while (exception.retry);
1139         return err;
1140 }
1141
1142 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1143 {
1144         struct nfs_open_context *ctx;
1145         int ret;
1146
1147         ctx = nfs4_state_find_open_context(state);
1148         if (IS_ERR(ctx))
1149                 return PTR_ERR(ctx);
1150         ret = nfs4_do_open_reclaim(ctx, state);
1151         put_nfs_open_context(ctx);
1152         return ret;
1153 }
1154
1155 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1156 {
1157         struct nfs4_opendata *opendata;
1158         int ret;
1159
1160         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1161         if (IS_ERR(opendata))
1162                 return PTR_ERR(opendata);
1163         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1164         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
1165                         sizeof(opendata->o_arg.u.delegation.data));
1166         ret = nfs4_open_recover(opendata, state);
1167         nfs4_opendata_put(opendata);
1168         return ret;
1169 }
1170
1171 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1172 {
1173         struct nfs4_exception exception = { };
1174         struct nfs_server *server = NFS_SERVER(state->inode);
1175         int err;
1176         do {
1177                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1178                 switch (err) {
1179                         case 0:
1180                         case -ENOENT:
1181                         case -ESTALE:
1182                                 goto out;
1183                         case -NFS4ERR_STALE_CLIENTID:
1184                         case -NFS4ERR_STALE_STATEID:
1185                         case -NFS4ERR_EXPIRED:
1186                                 /* Don't recall a delegation if it was lost */
1187                                 nfs4_schedule_state_recovery(server->nfs_client);
1188                                 goto out;
1189                         case -ERESTARTSYS:
1190                                 /*
1191                                  * The show must go on: exit, but mark the
1192                                  * stateid as needing recovery.
1193                                  */
1194                         case -NFS4ERR_ADMIN_REVOKED:
1195                         case -NFS4ERR_BAD_STATEID:
1196                                 nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
1197                         case -ENOMEM:
1198                                 err = 0;
1199                                 goto out;
1200                 }
1201                 err = nfs4_handle_exception(server, err, &exception);
1202         } while (exception.retry);
1203 out:
1204         return err;
1205 }
1206
1207 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1208 {
1209         struct nfs4_opendata *data = calldata;
1210
1211         data->rpc_status = task->tk_status;
1212         if (RPC_ASSASSINATED(task))
1213                 return;
1214         if (data->rpc_status == 0) {
1215                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
1216                                 sizeof(data->o_res.stateid.data));
1217                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1218                 renew_lease(data->o_res.server, data->timestamp);
1219                 data->rpc_done = 1;
1220         }
1221 }
1222
1223 static void nfs4_open_confirm_release(void *calldata)
1224 {
1225         struct nfs4_opendata *data = calldata;
1226         struct nfs4_state *state = NULL;
1227
1228         /* If this request hasn't been cancelled, do nothing */
1229         if (data->cancelled == 0)
1230                 goto out_free;
1231         /* In case of error, no cleanup! */
1232         if (!data->rpc_done)
1233                 goto out_free;
1234         state = nfs4_opendata_to_nfs4_state(data);
1235         if (!IS_ERR(state))
1236                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1237 out_free:
1238         nfs4_opendata_put(data);
1239 }
1240
1241 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1242         .rpc_call_done = nfs4_open_confirm_done,
1243         .rpc_release = nfs4_open_confirm_release,
1244 };
1245
1246 /*
1247  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1248  */
1249 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1250 {
1251         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1252         struct rpc_task *task;
1253         struct  rpc_message msg = {
1254                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1255                 .rpc_argp = &data->c_arg,
1256                 .rpc_resp = &data->c_res,
1257                 .rpc_cred = data->owner->so_cred,
1258         };
1259         struct rpc_task_setup task_setup_data = {
1260                 .rpc_client = server->client,
1261                 .rpc_message = &msg,
1262                 .callback_ops = &nfs4_open_confirm_ops,
1263                 .callback_data = data,
1264                 .workqueue = nfsiod_workqueue,
1265                 .flags = RPC_TASK_ASYNC,
1266         };
1267         int status;
1268
1269         kref_get(&data->kref);
1270         data->rpc_done = 0;
1271         data->rpc_status = 0;
1272         data->timestamp = jiffies;
1273         task = rpc_run_task(&task_setup_data);
1274         if (IS_ERR(task))
1275                 return PTR_ERR(task);
1276         status = nfs4_wait_for_completion_rpc_task(task);
1277         if (status != 0) {
1278                 data->cancelled = 1;
1279                 smp_wmb();
1280         } else
1281                 status = data->rpc_status;
1282         rpc_put_task(task);
1283         return status;
1284 }
1285
1286 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1287 {
1288         struct nfs4_opendata *data = calldata;
1289         struct nfs4_state_owner *sp = data->owner;
1290
1291         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1292                 return;
1293         /*
1294          * Check if we still need to send an OPEN call, or if we can use
1295          * a delegation instead.
1296          */
1297         if (data->state != NULL) {
1298                 struct nfs_delegation *delegation;
1299
1300                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1301                         goto out_no_action;
1302                 rcu_read_lock();
1303                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1304                 if (delegation != NULL &&
1305                     test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) {
1306                         rcu_read_unlock();
1307                         goto out_no_action;
1308                 }
1309                 rcu_read_unlock();
1310         }
1311         /* Update sequence id. */
1312         data->o_arg.id = sp->so_owner_id.id;
1313         data->o_arg.clientid = sp->so_client->cl_clientid;
1314         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1315                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1316                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1317         }
1318         data->timestamp = jiffies;
1319         if (nfs4_setup_sequence(data->o_arg.server->nfs_client,
1320                                 &data->o_arg.seq_args,
1321                                 &data->o_res.seq_res, 1, task))
1322                 return;
1323         rpc_call_start(task);
1324         return;
1325 out_no_action:
1326         task->tk_action = NULL;
1327
1328 }
1329
1330 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1331 {
1332         struct nfs4_opendata *data = calldata;
1333
1334         data->rpc_status = task->tk_status;
1335
1336         nfs4_sequence_done(data->o_arg.server, &data->o_res.seq_res,
1337                         task->tk_status);
1338
1339         if (RPC_ASSASSINATED(task))
1340                 return;
1341         if (task->tk_status == 0) {
1342                 switch (data->o_res.f_attr->mode & S_IFMT) {
1343                         case S_IFREG:
1344                                 break;
1345                         case S_IFLNK:
1346                                 data->rpc_status = -ELOOP;
1347                                 break;
1348                         case S_IFDIR:
1349                                 data->rpc_status = -EISDIR;
1350                                 break;
1351                         default:
1352                                 data->rpc_status = -ENOTDIR;
1353                 }
1354                 renew_lease(data->o_res.server, data->timestamp);
1355                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1356                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1357         }
1358         data->rpc_done = 1;
1359 }
1360
1361 static void nfs4_open_release(void *calldata)
1362 {
1363         struct nfs4_opendata *data = calldata;
1364         struct nfs4_state *state = NULL;
1365
1366         /* If this request hasn't been cancelled, do nothing */
1367         if (data->cancelled == 0)
1368                 goto out_free;
1369         /* In case of error, no cleanup! */
1370         if (data->rpc_status != 0 || !data->rpc_done)
1371                 goto out_free;
1372         /* In case we need an open_confirm, no cleanup! */
1373         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1374                 goto out_free;
1375         state = nfs4_opendata_to_nfs4_state(data);
1376         if (!IS_ERR(state))
1377                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1378 out_free:
1379         nfs4_opendata_put(data);
1380 }
1381
1382 static const struct rpc_call_ops nfs4_open_ops = {
1383         .rpc_call_prepare = nfs4_open_prepare,
1384         .rpc_call_done = nfs4_open_done,
1385         .rpc_release = nfs4_open_release,
1386 };
1387
1388 /*
1389  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1390  */
1391 static int _nfs4_proc_open(struct nfs4_opendata *data)
1392 {
1393         struct inode *dir = data->dir->d_inode;
1394         struct nfs_server *server = NFS_SERVER(dir);
1395         struct nfs_openargs *o_arg = &data->o_arg;
1396         struct nfs_openres *o_res = &data->o_res;
1397         struct rpc_task *task;
1398         struct rpc_message msg = {
1399                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1400                 .rpc_argp = o_arg,
1401                 .rpc_resp = o_res,
1402                 .rpc_cred = data->owner->so_cred,
1403         };
1404         struct rpc_task_setup task_setup_data = {
1405                 .rpc_client = server->client,
1406                 .rpc_message = &msg,
1407                 .callback_ops = &nfs4_open_ops,
1408                 .callback_data = data,
1409                 .workqueue = nfsiod_workqueue,
1410                 .flags = RPC_TASK_ASYNC,
1411         };
1412         int status;
1413
1414         kref_get(&data->kref);
1415         data->rpc_done = 0;
1416         data->rpc_status = 0;
1417         data->cancelled = 0;
1418         task = rpc_run_task(&task_setup_data);
1419         if (IS_ERR(task))
1420                 return PTR_ERR(task);
1421         status = nfs4_wait_for_completion_rpc_task(task);
1422         if (status != 0) {
1423                 data->cancelled = 1;
1424                 smp_wmb();
1425         } else
1426                 status = data->rpc_status;
1427         rpc_put_task(task);
1428         if (status != 0 || !data->rpc_done)
1429                 return status;
1430
1431         if (o_res->fh.size == 0)
1432                 _nfs4_proc_lookup(dir, o_arg->name, &o_res->fh, o_res->f_attr);
1433
1434         if (o_arg->open_flags & O_CREAT) {
1435                 update_changeattr(dir, &o_res->cinfo);
1436                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1437         } else
1438                 nfs_refresh_inode(dir, o_res->dir_attr);
1439         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1440                 status = _nfs4_proc_open_confirm(data);
1441                 if (status != 0)
1442                         return status;
1443         }
1444         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1445                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1446         return 0;
1447 }
1448
1449 static int nfs4_recover_expired_lease(struct nfs_server *server)
1450 {
1451         struct nfs_client *clp = server->nfs_client;
1452         unsigned int loop;
1453         int ret;
1454
1455         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1456                 ret = nfs4_wait_clnt_recover(clp);
1457                 if (ret != 0)
1458                         break;
1459                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1460                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1461                         break;
1462                 nfs4_schedule_state_recovery(clp);
1463                 ret = -EIO;
1464         }
1465         return ret;
1466 }
1467
1468 /*
1469  * OPEN_EXPIRED:
1470  *      reclaim state on the server after a network partition.
1471  *      Assumes caller holds the appropriate lock
1472  */
1473 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1474 {
1475         struct nfs4_opendata *opendata;
1476         int ret;
1477
1478         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1479         if (IS_ERR(opendata))
1480                 return PTR_ERR(opendata);
1481         ret = nfs4_open_recover(opendata, state);
1482         if (ret == -ESTALE)
1483                 d_drop(ctx->path.dentry);
1484         nfs4_opendata_put(opendata);
1485         return ret;
1486 }
1487
1488 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1489 {
1490         struct nfs_server *server = NFS_SERVER(state->inode);
1491         struct nfs4_exception exception = { };
1492         int err;
1493
1494         do {
1495                 err = _nfs4_open_expired(ctx, state);
1496                 switch (err) {
1497                 default:
1498                         goto out;
1499                 case -NFS4ERR_GRACE:
1500                 case -NFS4ERR_DELAY:
1501                         nfs4_handle_exception(server, err, &exception);
1502                         err = 0;
1503                 }
1504         } while (exception.retry);
1505 out:
1506         return err;
1507 }
1508
1509 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1510 {
1511         struct nfs_open_context *ctx;
1512         int ret;
1513
1514         ctx = nfs4_state_find_open_context(state);
1515         if (IS_ERR(ctx))
1516                 return PTR_ERR(ctx);
1517         ret = nfs4_do_open_expired(ctx, state);
1518         put_nfs_open_context(ctx);
1519         return ret;
1520 }
1521
1522 /*
1523  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1524  * fields corresponding to attributes that were used to store the verifier.
1525  * Make sure we clobber those fields in the later setattr call
1526  */
1527 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1528 {
1529         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1530             !(sattr->ia_valid & ATTR_ATIME_SET))
1531                 sattr->ia_valid |= ATTR_ATIME;
1532
1533         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1534             !(sattr->ia_valid & ATTR_MTIME_SET))
1535                 sattr->ia_valid |= ATTR_MTIME;
1536 }
1537
1538 /*
1539  * Returns a referenced nfs4_state
1540  */
1541 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)
1542 {
1543         struct nfs4_state_owner  *sp;
1544         struct nfs4_state     *state = NULL;
1545         struct nfs_server       *server = NFS_SERVER(dir);
1546         struct nfs4_opendata *opendata;
1547         int status;
1548
1549         /* Protect against reboot recovery conflicts */
1550         status = -ENOMEM;
1551         if (!(sp = nfs4_get_state_owner(server, cred))) {
1552                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1553                 goto out_err;
1554         }
1555         status = nfs4_recover_expired_lease(server);
1556         if (status != 0)
1557                 goto err_put_state_owner;
1558         if (path->dentry->d_inode != NULL)
1559                 nfs4_return_incompatible_delegation(path->dentry->d_inode, fmode);
1560         status = -ENOMEM;
1561         opendata = nfs4_opendata_alloc(path, sp, fmode, flags, sattr);
1562         if (opendata == NULL)
1563                 goto err_put_state_owner;
1564
1565         if (path->dentry->d_inode != NULL)
1566                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1567
1568         status = _nfs4_proc_open(opendata);
1569         if (status != 0)
1570                 goto err_opendata_put;
1571
1572         if (opendata->o_arg.open_flags & O_EXCL)
1573                 nfs4_exclusive_attrset(opendata, sattr);
1574
1575         state = nfs4_opendata_to_nfs4_state(opendata);
1576         status = PTR_ERR(state);
1577         if (IS_ERR(state))
1578                 goto err_opendata_put;
1579         nfs4_opendata_put(opendata);
1580         nfs4_put_state_owner(sp);
1581         *res = state;
1582         return 0;
1583 err_opendata_put:
1584         nfs4_opendata_put(opendata);
1585 err_put_state_owner:
1586         nfs4_put_state_owner(sp);
1587 out_err:
1588         *res = NULL;
1589         return status;
1590 }
1591
1592
1593 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)
1594 {
1595         struct nfs4_exception exception = { };
1596         struct nfs4_state *res;
1597         int status;
1598
1599         do {
1600                 status = _nfs4_do_open(dir, path, fmode, flags, sattr, cred, &res);
1601                 if (status == 0)
1602                         break;
1603                 /* NOTE: BAD_SEQID means the server and client disagree about the
1604                  * book-keeping w.r.t. state-changing operations
1605                  * (OPEN/CLOSE/LOCK/LOCKU...)
1606                  * It is actually a sign of a bug on the client or on the server.
1607                  *
1608                  * If we receive a BAD_SEQID error in the particular case of
1609                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1610                  * have unhashed the old state_owner for us, and that we can
1611                  * therefore safely retry using a new one. We should still warn
1612                  * the user though...
1613                  */
1614                 if (status == -NFS4ERR_BAD_SEQID) {
1615                         printk(KERN_WARNING "NFS: v4 server %s "
1616                                         " returned a bad sequence-id error!\n",
1617                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1618                         exception.retry = 1;
1619                         continue;
1620                 }
1621                 /*
1622                  * BAD_STATEID on OPEN means that the server cancelled our
1623                  * state before it received the OPEN_CONFIRM.
1624                  * Recover by retrying the request as per the discussion
1625                  * on Page 181 of RFC3530.
1626                  */
1627                 if (status == -NFS4ERR_BAD_STATEID) {
1628                         exception.retry = 1;
1629                         continue;
1630                 }
1631                 if (status == -EAGAIN) {
1632                         /* We must have found a delegation */
1633                         exception.retry = 1;
1634                         continue;
1635                 }
1636                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1637                                         status, &exception));
1638         } while (exception.retry);
1639         return res;
1640 }
1641
1642 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1643                             struct nfs_fattr *fattr, struct iattr *sattr,
1644                             struct nfs4_state *state)
1645 {
1646         struct nfs_server *server = NFS_SERVER(inode);
1647         struct nfs_setattrargs  arg = {
1648                 .fh             = NFS_FH(inode),
1649                 .iap            = sattr,
1650                 .server         = server,
1651                 .bitmask = server->attr_bitmask,
1652         };
1653         struct nfs_setattrres  res = {
1654                 .fattr          = fattr,
1655                 .server         = server,
1656         };
1657         struct rpc_message msg = {
1658                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1659                 .rpc_argp       = &arg,
1660                 .rpc_resp       = &res,
1661                 .rpc_cred       = cred,
1662         };
1663         unsigned long timestamp = jiffies;
1664         int status;
1665
1666         nfs_fattr_init(fattr);
1667
1668         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1669                 /* Use that stateid */
1670         } else if (state != NULL) {
1671                 nfs4_copy_stateid(&arg.stateid, state, current->files);
1672         } else
1673                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1674
1675         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
1676         if (status == 0 && state != NULL)
1677                 renew_lease(server, timestamp);
1678         return status;
1679 }
1680
1681 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1682                            struct nfs_fattr *fattr, struct iattr *sattr,
1683                            struct nfs4_state *state)
1684 {
1685         struct nfs_server *server = NFS_SERVER(inode);
1686         struct nfs4_exception exception = { };
1687         int err;
1688         do {
1689                 err = nfs4_handle_exception(server,
1690                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1691                                 &exception);
1692         } while (exception.retry);
1693         return err;
1694 }
1695
1696 struct nfs4_closedata {
1697         struct path path;
1698         struct inode *inode;
1699         struct nfs4_state *state;
1700         struct nfs_closeargs arg;
1701         struct nfs_closeres res;
1702         struct nfs_fattr fattr;
1703         unsigned long timestamp;
1704 };
1705
1706 static void nfs4_free_closedata(void *data)
1707 {
1708         struct nfs4_closedata *calldata = data;
1709         struct nfs4_state_owner *sp = calldata->state->owner;
1710
1711         nfs4_put_open_state(calldata->state);
1712         nfs_free_seqid(calldata->arg.seqid);
1713         nfs4_put_state_owner(sp);
1714         path_put(&calldata->path);
1715         kfree(calldata);
1716 }
1717
1718 static void nfs4_close_done(struct rpc_task *task, void *data)
1719 {
1720         struct nfs4_closedata *calldata = data;
1721         struct nfs4_state *state = calldata->state;
1722         struct nfs_server *server = NFS_SERVER(calldata->inode);
1723
1724         nfs4_sequence_done(server, &calldata->res.seq_res, task->tk_status);
1725         if (RPC_ASSASSINATED(task))
1726                 return;
1727         /* hmm. we are done with the inode, and in the process of freeing
1728          * the state_owner. we keep this around to process errors
1729          */
1730         switch (task->tk_status) {
1731                 case 0:
1732                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1733                         renew_lease(server, calldata->timestamp);
1734                         break;
1735                 case -NFS4ERR_STALE_STATEID:
1736                 case -NFS4ERR_OLD_STATEID:
1737                 case -NFS4ERR_BAD_STATEID:
1738                 case -NFS4ERR_EXPIRED:
1739                         if (calldata->arg.fmode == 0)
1740                                 break;
1741                 default:
1742                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN) {
1743                                 nfs4_restart_rpc(task, server->nfs_client);
1744                                 return;
1745                         }
1746         }
1747         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1748 }
1749
1750 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1751 {
1752         struct nfs4_closedata *calldata = data;
1753         struct nfs4_state *state = calldata->state;
1754         int clear_rd, clear_wr, clear_rdwr;
1755
1756         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1757                 return;
1758
1759         clear_rd = clear_wr = clear_rdwr = 0;
1760         spin_lock(&state->owner->so_lock);
1761         /* Calculate the change in open mode */
1762         if (state->n_rdwr == 0) {
1763                 if (state->n_rdonly == 0) {
1764                         clear_rd |= test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1765                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1766                 }
1767                 if (state->n_wronly == 0) {
1768                         clear_wr |= test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1769                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1770                 }
1771         }
1772         spin_unlock(&state->owner->so_lock);
1773         if (!clear_rd && !clear_wr && !clear_rdwr) {
1774                 /* Note: exit _without_ calling nfs4_close_done */
1775                 task->tk_action = NULL;
1776                 return;
1777         }
1778         nfs_fattr_init(calldata->res.fattr);
1779         if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0) {
1780                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1781                 calldata->arg.fmode = FMODE_READ;
1782         } else if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0) {
1783                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1784                 calldata->arg.fmode = FMODE_WRITE;
1785         }
1786         calldata->timestamp = jiffies;
1787         if (nfs4_setup_sequence((NFS_SERVER(calldata->inode))->nfs_client,
1788                                 &calldata->arg.seq_args, &calldata->res.seq_res,
1789                                 1, task))
1790                 return;
1791         rpc_call_start(task);
1792 }
1793
1794 static const struct rpc_call_ops nfs4_close_ops = {
1795         .rpc_call_prepare = nfs4_close_prepare,
1796         .rpc_call_done = nfs4_close_done,
1797         .rpc_release = nfs4_free_closedata,
1798 };
1799
1800 /* 
1801  * It is possible for data to be read/written from a mem-mapped file 
1802  * after the sys_close call (which hits the vfs layer as a flush).
1803  * This means that we can't safely call nfsv4 close on a file until 
1804  * the inode is cleared. This in turn means that we are not good
1805  * NFSv4 citizens - we do not indicate to the server to update the file's 
1806  * share state even when we are done with one of the three share 
1807  * stateid's in the inode.
1808  *
1809  * NOTE: Caller must be holding the sp->so_owner semaphore!
1810  */
1811 int nfs4_do_close(struct path *path, struct nfs4_state *state, int wait)
1812 {
1813         struct nfs_server *server = NFS_SERVER(state->inode);
1814         struct nfs4_closedata *calldata;
1815         struct nfs4_state_owner *sp = state->owner;
1816         struct rpc_task *task;
1817         struct rpc_message msg = {
1818                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1819                 .rpc_cred = state->owner->so_cred,
1820         };
1821         struct rpc_task_setup task_setup_data = {
1822                 .rpc_client = server->client,
1823                 .rpc_message = &msg,
1824                 .callback_ops = &nfs4_close_ops,
1825                 .workqueue = nfsiod_workqueue,
1826                 .flags = RPC_TASK_ASYNC,
1827         };
1828         int status = -ENOMEM;
1829
1830         calldata = kzalloc(sizeof(*calldata), GFP_KERNEL);
1831         if (calldata == NULL)
1832                 goto out;
1833         calldata->inode = state->inode;
1834         calldata->state = state;
1835         calldata->arg.fh = NFS_FH(state->inode);
1836         calldata->arg.stateid = &state->open_stateid;
1837         if (nfs4_has_session(server->nfs_client))
1838                 memset(calldata->arg.stateid->data, 0, 4);    /* clear seqid */
1839         /* Serialization for the sequence id */
1840         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1841         if (calldata->arg.seqid == NULL)
1842                 goto out_free_calldata;
1843         calldata->arg.fmode = 0;
1844         calldata->arg.bitmask = server->cache_consistency_bitmask;
1845         calldata->res.fattr = &calldata->fattr;
1846         calldata->res.seqid = calldata->arg.seqid;
1847         calldata->res.server = server;
1848         calldata->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
1849         calldata->path.mnt = mntget(path->mnt);
1850         calldata->path.dentry = dget(path->dentry);
1851
1852         msg.rpc_argp = &calldata->arg,
1853         msg.rpc_resp = &calldata->res,
1854         task_setup_data.callback_data = calldata;
1855         task = rpc_run_task(&task_setup_data);
1856         if (IS_ERR(task))
1857                 return PTR_ERR(task);
1858         status = 0;
1859         if (wait)
1860                 status = rpc_wait_for_completion_task(task);
1861         rpc_put_task(task);
1862         return status;
1863 out_free_calldata:
1864         kfree(calldata);
1865 out:
1866         nfs4_put_open_state(state);
1867         nfs4_put_state_owner(sp);
1868         return status;
1869 }
1870
1871 static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state, fmode_t fmode)
1872 {
1873         struct file *filp;
1874         int ret;
1875
1876         /* If the open_intent is for execute, we have an extra check to make */
1877         if (fmode & FMODE_EXEC) {
1878                 ret = nfs_may_open(state->inode,
1879                                 state->owner->so_cred,
1880                                 nd->intent.open.flags);
1881                 if (ret < 0)
1882                         goto out_close;
1883         }
1884         filp = lookup_instantiate_filp(nd, path->dentry, NULL);
1885         if (!IS_ERR(filp)) {
1886                 struct nfs_open_context *ctx;
1887                 ctx = nfs_file_open_context(filp);
1888                 ctx->state = state;
1889                 return 0;
1890         }
1891         ret = PTR_ERR(filp);
1892 out_close:
1893         nfs4_close_sync(path, state, fmode & (FMODE_READ|FMODE_WRITE));
1894         return ret;
1895 }
1896
1897 struct dentry *
1898 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1899 {
1900         struct path path = {
1901                 .mnt = nd->path.mnt,
1902                 .dentry = dentry,
1903         };
1904         struct dentry *parent;
1905         struct iattr attr;
1906         struct rpc_cred *cred;
1907         struct nfs4_state *state;
1908         struct dentry *res;
1909         fmode_t fmode = nd->intent.open.flags & (FMODE_READ | FMODE_WRITE | FMODE_EXEC);
1910
1911         if (nd->flags & LOOKUP_CREATE) {
1912                 attr.ia_mode = nd->intent.open.create_mode;
1913                 attr.ia_valid = ATTR_MODE;
1914                 if (!IS_POSIXACL(dir))
1915                         attr.ia_mode &= ~current_umask();
1916         } else {
1917                 attr.ia_valid = 0;
1918                 BUG_ON(nd->intent.open.flags & O_CREAT);
1919         }
1920
1921         cred = rpc_lookup_cred();
1922         if (IS_ERR(cred))
1923                 return (struct dentry *)cred;
1924         parent = dentry->d_parent;
1925         /* Protect against concurrent sillydeletes */
1926         nfs_block_sillyrename(parent);
1927         state = nfs4_do_open(dir, &path, fmode, nd->intent.open.flags, &attr, cred);
1928         put_rpccred(cred);
1929         if (IS_ERR(state)) {
1930                 if (PTR_ERR(state) == -ENOENT) {
1931                         d_add(dentry, NULL);
1932                         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1933                 }
1934                 nfs_unblock_sillyrename(parent);
1935                 return (struct dentry *)state;
1936         }
1937         res = d_add_unique(dentry, igrab(state->inode));
1938         if (res != NULL)
1939                 path.dentry = res;
1940         nfs_set_verifier(path.dentry, nfs_save_change_attribute(dir));
1941         nfs_unblock_sillyrename(parent);
1942         nfs4_intent_set_file(nd, &path, state, fmode);
1943         return res;
1944 }
1945
1946 int
1947 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1948 {
1949         struct path path = {
1950                 .mnt = nd->path.mnt,
1951                 .dentry = dentry,
1952         };
1953         struct rpc_cred *cred;
1954         struct nfs4_state *state;
1955         fmode_t fmode = openflags & (FMODE_READ | FMODE_WRITE);
1956
1957         cred = rpc_lookup_cred();
1958         if (IS_ERR(cred))
1959                 return PTR_ERR(cred);
1960         state = nfs4_do_open(dir, &path, fmode, openflags, NULL, cred);
1961         put_rpccred(cred);
1962         if (IS_ERR(state)) {
1963                 switch (PTR_ERR(state)) {
1964                         case -EPERM:
1965                         case -EACCES:
1966                         case -EDQUOT:
1967                         case -ENOSPC:
1968                         case -EROFS:
1969                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1970                                 return 1;
1971                         default:
1972                                 goto out_drop;
1973                 }
1974         }
1975         if (state->inode == dentry->d_inode) {
1976                 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1977                 nfs4_intent_set_file(nd, &path, state, fmode);
1978                 return 1;
1979         }
1980         nfs4_close_sync(&path, state, fmode);
1981 out_drop:
1982         d_drop(dentry);
1983         return 0;
1984 }
1985
1986 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
1987 {
1988         if (ctx->state == NULL)
1989                 return;
1990         if (is_sync)
1991                 nfs4_close_sync(&ctx->path, ctx->state, ctx->mode);
1992         else
1993                 nfs4_close_state(&ctx->path, ctx->state, ctx->mode);
1994 }
1995
1996 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1997 {
1998         struct nfs4_server_caps_arg args = {
1999                 .fhandle = fhandle,
2000         };
2001         struct nfs4_server_caps_res res = {};
2002         struct rpc_message msg = {
2003                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2004                 .rpc_argp = &args,
2005                 .rpc_resp = &res,
2006         };
2007         int status;
2008
2009         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2010         if (status == 0) {
2011                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2012                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2013                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2014                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2015                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2016                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2017                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2018                         server->caps |= NFS_CAP_ACLS;
2019                 if (res.has_links != 0)
2020                         server->caps |= NFS_CAP_HARDLINKS;
2021                 if (res.has_symlinks != 0)
2022                         server->caps |= NFS_CAP_SYMLINKS;
2023                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2024                         server->caps |= NFS_CAP_FILEID;
2025                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2026                         server->caps |= NFS_CAP_MODE;
2027                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2028                         server->caps |= NFS_CAP_NLINK;
2029                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2030                         server->caps |= NFS_CAP_OWNER;
2031                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2032                         server->caps |= NFS_CAP_OWNER_GROUP;
2033                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2034                         server->caps |= NFS_CAP_ATIME;
2035                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2036                         server->caps |= NFS_CAP_CTIME;
2037                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2038                         server->caps |= NFS_CAP_MTIME;
2039
2040                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2041                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2042                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2043                 server->acl_bitmask = res.acl_bitmask;
2044         }
2045
2046         return status;
2047 }
2048
2049 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2050 {
2051         struct nfs4_exception exception = { };
2052         int err;
2053         do {
2054                 err = nfs4_handle_exception(server,
2055                                 _nfs4_server_capabilities(server, fhandle),
2056                                 &exception);
2057         } while (exception.retry);
2058         return err;
2059 }
2060
2061 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2062                 struct nfs_fsinfo *info)
2063 {
2064         struct nfs4_lookup_root_arg args = {
2065                 .bitmask = nfs4_fattr_bitmap,
2066         };
2067         struct nfs4_lookup_res res = {
2068                 .server = server,
2069                 .fattr = info->fattr,
2070                 .fh = fhandle,
2071         };
2072         struct rpc_message msg = {
2073                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2074                 .rpc_argp = &args,
2075                 .rpc_resp = &res,
2076         };
2077
2078         nfs_fattr_init(info->fattr);
2079         return nfs4_call_sync(server, &msg, &args, &res, 0);
2080 }
2081
2082 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2083                 struct nfs_fsinfo *info)
2084 {
2085         struct nfs4_exception exception = { };
2086         int err;
2087         do {
2088                 err = nfs4_handle_exception(server,
2089                                 _nfs4_lookup_root(server, fhandle, info),
2090                                 &exception);
2091         } while (exception.retry);
2092         return err;
2093 }
2094
2095 /*
2096  * get the file handle for the "/" directory on the server
2097  */
2098 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2099                               struct nfs_fsinfo *info)
2100 {
2101         int status;
2102
2103         status = nfs4_lookup_root(server, fhandle, info);
2104         if (status == 0)
2105                 status = nfs4_server_capabilities(server, fhandle);
2106         if (status == 0)
2107                 status = nfs4_do_fsinfo(server, fhandle, info);
2108         return nfs4_map_errors(status);
2109 }
2110
2111 /*
2112  * Get locations and (maybe) other attributes of a referral.
2113  * Note that we'll actually follow the referral later when
2114  * we detect fsid mismatch in inode revalidation
2115  */
2116 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2117 {
2118         int status = -ENOMEM;
2119         struct page *page = NULL;
2120         struct nfs4_fs_locations *locations = NULL;
2121
2122         page = alloc_page(GFP_KERNEL);
2123         if (page == NULL)
2124                 goto out;
2125         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2126         if (locations == NULL)
2127                 goto out;
2128
2129         status = nfs4_proc_fs_locations(dir, name, locations, page);
2130         if (status != 0)
2131                 goto out;
2132         /* Make sure server returned a different fsid for the referral */
2133         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2134                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __func__, name->name);
2135                 status = -EIO;
2136                 goto out;
2137         }
2138
2139         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2140         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
2141         if (!fattr->mode)
2142                 fattr->mode = S_IFDIR;
2143         memset(fhandle, 0, sizeof(struct nfs_fh));
2144 out:
2145         if (page)
2146                 __free_page(page);
2147         if (locations)
2148                 kfree(locations);
2149         return status;
2150 }
2151
2152 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2153 {
2154         struct nfs4_getattr_arg args = {
2155                 .fh = fhandle,
2156                 .bitmask = server->attr_bitmask,
2157         };
2158         struct nfs4_getattr_res res = {
2159                 .fattr = fattr,
2160                 .server = server,
2161         };
2162         struct rpc_message msg = {
2163                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2164                 .rpc_argp = &args,
2165                 .rpc_resp = &res,
2166         };
2167         
2168         nfs_fattr_init(fattr);
2169         return nfs4_call_sync(server, &msg, &args, &res, 0);
2170 }
2171
2172 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2173 {
2174         struct nfs4_exception exception = { };
2175         int err;
2176         do {
2177                 err = nfs4_handle_exception(server,
2178                                 _nfs4_proc_getattr(server, fhandle, fattr),
2179                                 &exception);
2180         } while (exception.retry);
2181         return err;
2182 }
2183
2184 /* 
2185  * The file is not closed if it is opened due to the a request to change
2186  * the size of the file. The open call will not be needed once the
2187  * VFS layer lookup-intents are implemented.
2188  *
2189  * Close is called when the inode is destroyed.
2190  * If we haven't opened the file for O_WRONLY, we
2191  * need to in the size_change case to obtain a stateid.
2192  *
2193  * Got race?
2194  * Because OPEN is always done by name in nfsv4, it is
2195  * possible that we opened a different file by the same
2196  * name.  We can recognize this race condition, but we
2197  * can't do anything about it besides returning an error.
2198  *
2199  * This will be fixed with VFS changes (lookup-intent).
2200  */
2201 static int
2202 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2203                   struct iattr *sattr)
2204 {
2205         struct inode *inode = dentry->d_inode;
2206         struct rpc_cred *cred = NULL;
2207         struct nfs4_state *state = NULL;
2208         int status;
2209
2210         nfs_fattr_init(fattr);
2211         
2212         /* Search for an existing open(O_WRITE) file */
2213         if (sattr->ia_valid & ATTR_FILE) {
2214                 struct nfs_open_context *ctx;
2215
2216                 ctx = nfs_file_open_context(sattr->ia_file);
2217                 if (ctx) {
2218                         cred = ctx->cred;
2219                         state = ctx->state;
2220                 }
2221         }
2222
2223         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2224         if (status == 0)
2225                 nfs_setattr_update_inode(inode, sattr);
2226         return status;
2227 }
2228
2229 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
2230                 const struct qstr *name, struct nfs_fh *fhandle,
2231                 struct nfs_fattr *fattr)
2232 {
2233         int                    status;
2234         struct nfs4_lookup_arg args = {
2235                 .bitmask = server->attr_bitmask,
2236                 .dir_fh = dirfh,
2237                 .name = name,
2238         };
2239         struct nfs4_lookup_res res = {
2240                 .server = server,
2241                 .fattr = fattr,
2242                 .fh = fhandle,
2243         };
2244         struct rpc_message msg = {
2245                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2246                 .rpc_argp = &args,
2247                 .rpc_resp = &res,
2248         };
2249
2250         nfs_fattr_init(fattr);
2251
2252         dprintk("NFS call  lookupfh %s\n", name->name);
2253         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2254         dprintk("NFS reply lookupfh: %d\n", status);
2255         return status;
2256 }
2257
2258 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
2259                               struct qstr *name, struct nfs_fh *fhandle,
2260                               struct nfs_fattr *fattr)
2261 {
2262         struct nfs4_exception exception = { };
2263         int err;
2264         do {
2265                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
2266                 /* FIXME: !!!! */
2267                 if (err == -NFS4ERR_MOVED) {
2268                         err = -EREMOTE;
2269                         break;
2270                 }
2271                 err = nfs4_handle_exception(server, err, &exception);
2272         } while (exception.retry);
2273         return err;
2274 }
2275
2276 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
2277                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2278 {
2279         int status;
2280         
2281         dprintk("NFS call  lookup %s\n", name->name);
2282         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
2283         if (status == -NFS4ERR_MOVED)
2284                 status = nfs4_get_referral(dir, name, fattr, fhandle);
2285         dprintk("NFS reply lookup: %d\n", status);
2286         return status;
2287 }
2288
2289 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2290 {
2291         struct nfs4_exception exception = { };
2292         int err;
2293         do {
2294                 err = nfs4_handle_exception(NFS_SERVER(dir),
2295                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
2296                                 &exception);
2297         } while (exception.retry);
2298         return err;
2299 }
2300
2301 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2302 {
2303         struct nfs_server *server = NFS_SERVER(inode);
2304         struct nfs_fattr fattr;
2305         struct nfs4_accessargs args = {
2306                 .fh = NFS_FH(inode),
2307                 .bitmask = server->attr_bitmask,
2308         };
2309         struct nfs4_accessres res = {
2310                 .server = server,
2311                 .fattr = &fattr,
2312         };
2313         struct rpc_message msg = {
2314                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2315                 .rpc_argp = &args,
2316                 .rpc_resp = &res,
2317                 .rpc_cred = entry->cred,
2318         };
2319         int mode = entry->mask;
2320         int status;
2321
2322         /*
2323          * Determine which access bits we want to ask for...
2324          */
2325         if (mode & MAY_READ)
2326                 args.access |= NFS4_ACCESS_READ;
2327         if (S_ISDIR(inode->i_mode)) {
2328                 if (mode & MAY_WRITE)
2329                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2330                 if (mode & MAY_EXEC)
2331                         args.access |= NFS4_ACCESS_LOOKUP;
2332         } else {
2333                 if (mode & MAY_WRITE)
2334                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2335                 if (mode & MAY_EXEC)
2336                         args.access |= NFS4_ACCESS_EXECUTE;
2337         }
2338         nfs_fattr_init(&fattr);
2339         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2340         if (!status) {
2341                 entry->mask = 0;
2342                 if (res.access & NFS4_ACCESS_READ)
2343                         entry->mask |= MAY_READ;
2344                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2345                         entry->mask |= MAY_WRITE;
2346                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2347                         entry->mask |= MAY_EXEC;
2348                 nfs_refresh_inode(inode, &fattr);
2349         }
2350         return status;
2351 }
2352
2353 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2354 {
2355         struct nfs4_exception exception = { };
2356         int err;
2357         do {
2358                 err = nfs4_handle_exception(NFS_SERVER(inode),
2359                                 _nfs4_proc_access(inode, entry),
2360                                 &exception);
2361         } while (exception.retry);
2362         return err;
2363 }
2364
2365 /*
2366  * TODO: For the time being, we don't try to get any attributes
2367  * along with any of the zero-copy operations READ, READDIR,
2368  * READLINK, WRITE.
2369  *
2370  * In the case of the first three, we want to put the GETATTR
2371  * after the read-type operation -- this is because it is hard
2372  * to predict the length of a GETATTR response in v4, and thus
2373  * align the READ data correctly.  This means that the GETATTR
2374  * may end up partially falling into the page cache, and we should
2375  * shift it into the 'tail' of the xdr_buf before processing.
2376  * To do this efficiently, we need to know the total length
2377  * of data received, which doesn't seem to be available outside
2378  * of the RPC layer.
2379  *
2380  * In the case of WRITE, we also want to put the GETATTR after
2381  * the operation -- in this case because we want to make sure
2382  * we get the post-operation mtime and size.  This means that
2383  * we can't use xdr_encode_pages() as written: we need a variant
2384  * of it which would leave room in the 'tail' iovec.
2385  *
2386  * Both of these changes to the XDR layer would in fact be quite
2387  * minor, but I decided to leave them for a subsequent patch.
2388  */
2389 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2390                 unsigned int pgbase, unsigned int pglen)
2391 {
2392         struct nfs4_readlink args = {
2393                 .fh       = NFS_FH(inode),
2394                 .pgbase   = pgbase,
2395                 .pglen    = pglen,
2396                 .pages    = &page,
2397         };
2398         struct nfs4_readlink_res res;
2399         struct rpc_message msg = {
2400                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2401                 .rpc_argp = &args,
2402                 .rpc_resp = &res,
2403         };
2404
2405         return nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
2406 }
2407
2408 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2409                 unsigned int pgbase, unsigned int pglen)
2410 {
2411         struct nfs4_exception exception = { };
2412         int err;
2413         do {
2414                 err = nfs4_handle_exception(NFS_SERVER(inode),
2415                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2416                                 &exception);
2417         } while (exception.retry);
2418         return err;
2419 }
2420
2421 /*
2422  * Got race?
2423  * We will need to arrange for the VFS layer to provide an atomic open.
2424  * Until then, this create/open method is prone to inefficiency and race
2425  * conditions due to the lookup, create, and open VFS calls from sys_open()
2426  * placed on the wire.
2427  *
2428  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2429  * The file will be opened again in the subsequent VFS open call
2430  * (nfs4_proc_file_open).
2431  *
2432  * The open for read will just hang around to be used by any process that
2433  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2434  */
2435
2436 static int
2437 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2438                  int flags, struct nameidata *nd)
2439 {
2440         struct path path = {
2441                 .mnt = nd->path.mnt,
2442                 .dentry = dentry,
2443         };
2444         struct nfs4_state *state;
2445         struct rpc_cred *cred;
2446         fmode_t fmode = flags & (FMODE_READ | FMODE_WRITE);
2447         int status = 0;
2448
2449         cred = rpc_lookup_cred();
2450         if (IS_ERR(cred)) {
2451                 status = PTR_ERR(cred);
2452                 goto out;
2453         }
2454         state = nfs4_do_open(dir, &path, fmode, flags, sattr, cred);
2455         d_drop(dentry);
2456         if (IS_ERR(state)) {
2457                 status = PTR_ERR(state);
2458                 goto out_putcred;
2459         }
2460         d_add(dentry, igrab(state->inode));
2461         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2462         if (flags & O_EXCL) {
2463                 struct nfs_fattr fattr;
2464                 status = nfs4_do_setattr(state->inode, cred, &fattr, sattr, state);
2465                 if (status == 0)
2466                         nfs_setattr_update_inode(state->inode, sattr);
2467                 nfs_post_op_update_inode(state->inode, &fattr);
2468         }
2469         if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
2470                 status = nfs4_intent_set_file(nd, &path, state, fmode);
2471         else
2472                 nfs4_close_sync(&path, state, fmode);
2473 out_putcred:
2474         put_rpccred(cred);
2475 out:
2476         return status;
2477 }
2478
2479 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2480 {
2481         struct nfs_server *server = NFS_SERVER(dir);
2482         struct nfs_removeargs args = {
2483                 .fh = NFS_FH(dir),
2484                 .name.len = name->len,
2485                 .name.name = name->name,
2486                 .bitmask = server->attr_bitmask,
2487         };
2488         struct nfs_removeres res = {
2489                 .server = server,
2490         };
2491         struct rpc_message msg = {
2492                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2493                 .rpc_argp = &args,
2494                 .rpc_resp = &res,
2495         };
2496         int                     status;
2497
2498         nfs_fattr_init(&res.dir_attr);
2499         status = nfs4_call_sync(server, &msg, &args, &res, 1);
2500         if (status == 0) {
2501                 update_changeattr(dir, &res.cinfo);
2502                 nfs_post_op_update_inode(dir, &res.dir_attr);
2503         }
2504         return status;
2505 }
2506
2507 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2508 {
2509         struct nfs4_exception exception = { };
2510         int err;
2511         do {
2512                 err = nfs4_handle_exception(NFS_SERVER(dir),
2513                                 _nfs4_proc_remove(dir, name),
2514                                 &exception);
2515         } while (exception.retry);
2516         return err;
2517 }
2518
2519 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2520 {
2521         struct nfs_server *server = NFS_SERVER(dir);
2522         struct nfs_removeargs *args = msg->rpc_argp;
2523         struct nfs_removeres *res = msg->rpc_resp;
2524
2525         args->bitmask = server->cache_consistency_bitmask;
2526         res->server = server;
2527         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2528 }
2529
2530 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2531 {
2532         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2533
2534         nfs4_sequence_done(res->server, &res->seq_res, task->tk_status);
2535         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2536                 return 0;
2537         update_changeattr(dir, &res->cinfo);
2538         nfs_post_op_update_inode(dir, &res->dir_attr);
2539         return 1;
2540 }
2541
2542 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2543                 struct inode *new_dir, struct qstr *new_name)
2544 {
2545         struct nfs_server *server = NFS_SERVER(old_dir);
2546         struct nfs4_rename_arg arg = {
2547                 .old_dir = NFS_FH(old_dir),
2548                 .new_dir = NFS_FH(new_dir),
2549                 .old_name = old_name,
2550                 .new_name = new_name,
2551                 .bitmask = server->attr_bitmask,
2552         };
2553         struct nfs_fattr old_fattr, new_fattr;
2554         struct nfs4_rename_res res = {
2555                 .server = server,
2556                 .old_fattr = &old_fattr,
2557                 .new_fattr = &new_fattr,
2558         };
2559         struct rpc_message msg = {
2560                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2561                 .rpc_argp = &arg,
2562                 .rpc_resp = &res,
2563         };
2564         int                     status;
2565         
2566         nfs_fattr_init(res.old_fattr);
2567         nfs_fattr_init(res.new_fattr);
2568         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2569
2570         if (!status) {
2571                 update_changeattr(old_dir, &res.old_cinfo);
2572                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2573                 update_changeattr(new_dir, &res.new_cinfo);
2574                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2575         }
2576         return status;
2577 }
2578
2579 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2580                 struct inode *new_dir, struct qstr *new_name)
2581 {
2582         struct nfs4_exception exception = { };
2583         int err;
2584         do {
2585                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2586                                 _nfs4_proc_rename(old_dir, old_name,
2587                                         new_dir, new_name),
2588                                 &exception);
2589         } while (exception.retry);
2590         return err;
2591 }
2592
2593 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2594 {
2595         struct nfs_server *server = NFS_SERVER(inode);
2596         struct nfs4_link_arg arg = {
2597                 .fh     = NFS_FH(inode),
2598                 .dir_fh = NFS_FH(dir),
2599                 .name   = name,
2600                 .bitmask = server->attr_bitmask,
2601         };
2602         struct nfs_fattr fattr, dir_attr;
2603         struct nfs4_link_res res = {
2604                 .server = server,
2605                 .fattr = &fattr,
2606                 .dir_attr = &dir_attr,
2607         };
2608         struct rpc_message msg = {
2609                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2610                 .rpc_argp = &arg,
2611                 .rpc_resp = &res,
2612         };
2613         int                     status;
2614
2615         nfs_fattr_init(res.fattr);
2616         nfs_fattr_init(res.dir_attr);
2617         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2618         if (!status) {
2619                 update_changeattr(dir, &res.cinfo);
2620                 nfs_post_op_update_inode(dir, res.dir_attr);
2621                 nfs_post_op_update_inode(inode, res.fattr);
2622         }
2623
2624         return status;
2625 }
2626
2627 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2628 {
2629         struct nfs4_exception exception = { };
2630         int err;
2631         do {
2632                 err = nfs4_handle_exception(NFS_SERVER(inode),
2633                                 _nfs4_proc_link(inode, dir, name),
2634                                 &exception);
2635         } while (exception.retry);
2636         return err;
2637 }
2638
2639 struct nfs4_createdata {
2640         struct rpc_message msg;
2641         struct nfs4_create_arg arg;
2642         struct nfs4_create_res res;
2643         struct nfs_fh fh;
2644         struct nfs_fattr fattr;
2645         struct nfs_fattr dir_fattr;
2646 };
2647
2648 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2649                 struct qstr *name, struct iattr *sattr, u32 ftype)
2650 {
2651         struct nfs4_createdata *data;
2652
2653         data = kzalloc(sizeof(*data), GFP_KERNEL);
2654         if (data != NULL) {
2655                 struct nfs_server *server = NFS_SERVER(dir);
2656
2657                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2658                 data->msg.rpc_argp = &data->arg;
2659                 data->msg.rpc_resp = &data->res;
2660                 data->arg.dir_fh = NFS_FH(dir);
2661                 data->arg.server = server;
2662                 data->arg.name = name;
2663                 data->arg.attrs = sattr;
2664                 data->arg.ftype = ftype;
2665                 data->arg.bitmask = server->attr_bitmask;
2666                 data->res.server = server;
2667                 data->res.fh = &data->fh;
2668                 data->res.fattr = &data->fattr;
2669                 data->res.dir_fattr = &data->dir_fattr;
2670                 nfs_fattr_init(data->res.fattr);
2671                 nfs_fattr_init(data->res.dir_fattr);
2672         }
2673         return data;
2674 }
2675
2676 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2677 {
2678         int status = nfs4_call_sync(NFS_SERVER(dir), &data->msg,
2679                                     &data->arg, &data->res, 1);
2680         if (status == 0) {
2681                 update_changeattr(dir, &data->res.dir_cinfo);
2682                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2683                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2684         }
2685         return status;
2686 }
2687
2688 static void nfs4_free_createdata(struct nfs4_createdata *data)
2689 {
2690         kfree(data);
2691 }
2692
2693 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2694                 struct page *page, unsigned int len, struct iattr *sattr)
2695 {
2696         struct nfs4_createdata *data;
2697         int status = -ENAMETOOLONG;
2698
2699         if (len > NFS4_MAXPATHLEN)
2700                 goto out;
2701
2702         status = -ENOMEM;
2703         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2704         if (data == NULL)
2705                 goto out;
2706
2707         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2708         data->arg.u.symlink.pages = &page;
2709         data->arg.u.symlink.len = len;
2710         
2711         status = nfs4_do_create(dir, dentry, data);
2712
2713         nfs4_free_createdata(data);
2714 out:
2715         return status;
2716 }
2717
2718 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2719                 struct page *page, unsigned int len, struct iattr *sattr)
2720 {
2721         struct nfs4_exception exception = { };
2722         int err;
2723         do {
2724                 err = nfs4_handle_exception(NFS_SERVER(dir),
2725                                 _nfs4_proc_symlink(dir, dentry, page,
2726                                                         len, sattr),
2727                                 &exception);
2728         } while (exception.retry);
2729         return err;
2730 }
2731
2732 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2733                 struct iattr *sattr)
2734 {
2735         struct nfs4_createdata *data;
2736         int status = -ENOMEM;
2737
2738         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2739         if (data == NULL)
2740                 goto out;
2741
2742         status = nfs4_do_create(dir, dentry, data);
2743
2744         nfs4_free_createdata(data);
2745 out:
2746         return status;
2747 }
2748
2749 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2750                 struct iattr *sattr)
2751 {
2752         struct nfs4_exception exception = { };
2753         int err;
2754         do {
2755                 err = nfs4_handle_exception(NFS_SERVER(dir),
2756                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2757                                 &exception);
2758         } while (exception.retry);
2759         return err;
2760 }
2761
2762 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2763                   u64 cookie, struct page *page, unsigned int count, int plus)
2764 {
2765         struct inode            *dir = dentry->d_inode;
2766         struct nfs4_readdir_arg args = {
2767                 .fh = NFS_FH(dir),
2768                 .pages = &page,
2769                 .pgbase = 0,
2770                 .count = count,
2771                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2772         };
2773         struct nfs4_readdir_res res;
2774         struct rpc_message msg = {
2775                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2776                 .rpc_argp = &args,
2777                 .rpc_resp = &res,
2778                 .rpc_cred = cred,
2779         };
2780         int                     status;
2781
2782         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
2783                         dentry->d_parent->d_name.name,
2784                         dentry->d_name.name,
2785                         (unsigned long long)cookie);
2786         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2787         res.pgbase = args.pgbase;
2788         status = nfs4_call_sync(NFS_SERVER(dir), &msg, &args, &res, 0);
2789         if (status == 0)
2790                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2791
2792         nfs_invalidate_atime(dir);
2793
2794         dprintk("%s: returns %d\n", __func__, status);
2795         return status;
2796 }
2797
2798 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2799                   u64 cookie, struct page *page, unsigned int count, int plus)
2800 {
2801         struct nfs4_exception exception = { };
2802         int err;
2803         do {
2804                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2805                                 _nfs4_proc_readdir(dentry, cred, cookie,
2806                                         page, count, plus),
2807                                 &exception);
2808         } while (exception.retry);
2809         return err;
2810 }
2811
2812 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2813                 struct iattr *sattr, dev_t rdev)
2814 {
2815         struct nfs4_createdata *data;
2816         int mode = sattr->ia_mode;
2817         int status = -ENOMEM;
2818
2819         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2820         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2821
2822         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
2823         if (data == NULL)
2824                 goto out;
2825
2826         if (S_ISFIFO(mode))
2827                 data->arg.ftype = NF4FIFO;
2828         else if (S_ISBLK(mode)) {
2829                 data->arg.ftype = NF4BLK;
2830                 data->arg.u.device.specdata1 = MAJOR(rdev);
2831                 data->arg.u.device.specdata2 = MINOR(rdev);
2832         }
2833         else if (S_ISCHR(mode)) {
2834                 data->arg.ftype = NF4CHR;
2835                 data->arg.u.device.specdata1 = MAJOR(rdev);
2836                 data->arg.u.device.specdata2 = MINOR(rdev);
2837         }
2838         
2839         status = nfs4_do_create(dir, dentry, data);
2840
2841         nfs4_free_createdata(data);
2842 out:
2843         return status;
2844 }
2845
2846 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2847                 struct iattr *sattr, dev_t rdev)
2848 {
2849         struct nfs4_exception exception = { };
2850         int err;
2851         do {
2852                 err = nfs4_handle_exception(NFS_SERVER(dir),
2853                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2854                                 &exception);
2855         } while (exception.retry);
2856         return err;
2857 }
2858
2859 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2860                  struct nfs_fsstat *fsstat)
2861 {
2862         struct nfs4_statfs_arg args = {
2863                 .fh = fhandle,
2864                 .bitmask = server->attr_bitmask,
2865         };
2866         struct nfs4_statfs_res res = {
2867                 .fsstat = fsstat,
2868         };
2869         struct rpc_message msg = {
2870                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2871                 .rpc_argp = &args,
2872                 .rpc_resp = &res,
2873         };
2874
2875         nfs_fattr_init(fsstat->fattr);
2876         return  nfs4_call_sync(server, &msg, &args, &res, 0);
2877 }
2878
2879 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2880 {
2881         struct nfs4_exception exception = { };
2882         int err;
2883         do {
2884                 err = nfs4_handle_exception(server,
2885                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2886                                 &exception);
2887         } while (exception.retry);
2888         return err;
2889 }
2890
2891 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2892                 struct nfs_fsinfo *fsinfo)
2893 {
2894         struct nfs4_fsinfo_arg args = {
2895                 .fh = fhandle,
2896                 .bitmask = server->attr_bitmask,
2897         };
2898         struct nfs4_fsinfo_res res = {
2899                 .fsinfo = fsinfo,
2900         };
2901         struct rpc_message msg = {
2902                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2903                 .rpc_argp = &args,
2904                 .rpc_resp = &res,
2905         };
2906
2907         return nfs4_call_sync(server, &msg, &args, &res, 0);
2908 }
2909
2910 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2911 {
2912         struct nfs4_exception exception = { };
2913         int err;
2914
2915         do {
2916                 err = nfs4_handle_exception(server,
2917                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2918                                 &exception);
2919         } while (exception.retry);
2920         return err;
2921 }
2922
2923 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2924 {
2925         nfs_fattr_init(fsinfo->fattr);
2926         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2927 }
2928
2929 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2930                 struct nfs_pathconf *pathconf)
2931 {
2932         struct nfs4_pathconf_arg args = {
2933                 .fh = fhandle,
2934                 .bitmask = server->attr_bitmask,
2935         };
2936         struct nfs4_pathconf_res res = {
2937                 .pathconf = pathconf,
2938         };
2939         struct rpc_message msg = {
2940                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2941                 .rpc_argp = &args,
2942                 .rpc_resp = &res,
2943         };
2944
2945         /* None of the pathconf attributes are mandatory to implement */
2946         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2947                 memset(pathconf, 0, sizeof(*pathconf));
2948                 return 0;
2949         }
2950
2951         nfs_fattr_init(pathconf->fattr);
2952         return nfs4_call_sync(server, &msg, &args, &res, 0);
2953 }
2954
2955 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2956                 struct nfs_pathconf *pathconf)
2957 {
2958         struct nfs4_exception exception = { };
2959         int err;
2960
2961         do {
2962                 err = nfs4_handle_exception(server,
2963                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2964                                 &exception);
2965         } while (exception.retry);
2966         return err;
2967 }
2968
2969 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
2970 {
2971         struct nfs_server *server = NFS_SERVER(data->inode);
2972
2973         dprintk("--> %s\n", __func__);
2974
2975         nfs4_sequence_done(server, &data->res.seq_res, task->tk_status);
2976
2977         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
2978                 nfs4_restart_rpc(task, server->nfs_client);
2979                 return -EAGAIN;
2980         }
2981
2982         nfs_invalidate_atime(data->inode);
2983         if (task->tk_status > 0)
2984                 renew_lease(server, data->timestamp);
2985         return 0;
2986 }
2987
2988 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
2989 {
2990         data->timestamp   = jiffies;
2991         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
2992 }
2993
2994 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
2995 {
2996         struct inode *inode = data->inode;
2997         
2998         nfs4_sequence_done(NFS_SERVER(inode), &data->res.seq_res,
2999                            task->tk_status);
3000
3001         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3002                 nfs4_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3003                 return -EAGAIN;
3004         }
3005         if (task->tk_status >= 0) {
3006                 renew_lease(NFS_SERVER(inode), data->timestamp);
3007                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3008         }
3009         return 0;
3010 }
3011
3012 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3013 {
3014         struct nfs_server *server = NFS_SERVER(data->inode);
3015
3016         data->args.bitmask = server->cache_consistency_bitmask;
3017         data->res.server = server;
3018         data->timestamp   = jiffies;
3019
3020         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3021 }
3022
3023 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3024 {
3025         struct inode *inode = data->inode;
3026         
3027         nfs4_sequence_done(NFS_SERVER(inode), &data->res.seq_res,
3028                            task->tk_status);
3029         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3030                 nfs4_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3031                 return -EAGAIN;
3032         }
3033         nfs_refresh_inode(inode, data->res.fattr);
3034         return 0;
3035 }
3036
3037 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3038 {
3039         struct nfs_server *server = NFS_SERVER(data->inode);
3040         
3041         data->args.bitmask = server->cache_consistency_bitmask;
3042         data->res.server = server;
3043         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3044 }
3045
3046 /*
3047  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3048  * standalone procedure for queueing an asynchronous RENEW.
3049  */
3050 static void nfs4_renew_done(struct rpc_task *task, void *data)
3051 {
3052         struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
3053         unsigned long timestamp = (unsigned long)data;
3054
3055         if (task->tk_status < 0) {
3056                 /* Unless we're shutting down, schedule state recovery! */
3057                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) != 0)
3058                         nfs4_schedule_state_recovery(clp);
3059                 return;
3060         }
3061         spin_lock(&clp->cl_lock);
3062         if (time_before(clp->cl_last_renewal,timestamp))
3063                 clp->cl_last_renewal = timestamp;
3064         spin_unlock(&clp->cl_lock);
3065 }
3066
3067 static const struct rpc_call_ops nfs4_renew_ops = {
3068         .rpc_call_done = nfs4_renew_done,
3069 };
3070
3071 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
3072 {
3073         struct rpc_message msg = {
3074                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3075                 .rpc_argp       = clp,
3076                 .rpc_cred       = cred,
3077         };
3078
3079         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3080                         &nfs4_renew_ops, (void *)jiffies);
3081 }
3082
3083 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3084 {
3085         struct rpc_message msg = {
3086                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3087                 .rpc_argp       = clp,
3088                 .rpc_cred       = cred,
3089         };
3090         unsigned long now = jiffies;
3091         int status;
3092
3093         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3094         if (status < 0)
3095                 return status;
3096         spin_lock(&clp->cl_lock);
3097         if (time_before(clp->cl_last_renewal,now))
3098                 clp->cl_last_renewal = now;
3099         spin_unlock(&clp->cl_lock);
3100         return 0;
3101 }
3102
3103 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3104 {
3105         return (server->caps & NFS_CAP_ACLS)
3106                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3107                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3108 }
3109
3110 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3111  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3112  * the stack.
3113  */
3114 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3115
3116 static void buf_to_pages(const void *buf, size_t buflen,
3117                 struct page **pages, unsigned int *pgbase)
3118 {
3119         const void *p = buf;
3120
3121         *pgbase = offset_in_page(buf);
3122         p -= *pgbase;
3123         while (p < buf + buflen) {
3124                 *(pages++) = virt_to_page(p);
3125                 p += PAGE_CACHE_SIZE;
3126         }
3127 }
3128
3129 struct nfs4_cached_acl {
3130         int cached;
3131         size_t len;
3132         char data[0];
3133 };
3134
3135 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3136 {
3137         struct nfs_inode *nfsi = NFS_I(inode);
3138
3139         spin_lock(&inode->i_lock);
3140         kfree(nfsi->nfs4_acl);
3141         nfsi->nfs4_acl = acl;
3142         spin_unlock(&inode->i_lock);
3143 }
3144
3145 static void nfs4_zap_acl_attr(struct inode *inode)
3146 {
3147         nfs4_set_cached_acl(inode, NULL);
3148 }
3149
3150 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3151 {
3152         struct nfs_inode *nfsi = NFS_I(inode);
3153         struct nfs4_cached_acl *acl;
3154         int ret = -ENOENT;
3155
3156         spin_lock(&inode->i_lock);
3157         acl = nfsi->nfs4_acl;
3158         if (acl == NULL)
3159                 goto out;
3160         if (buf == NULL) /* user is just asking for length */
3161                 goto out_len;
3162         if (acl->cached == 0)
3163                 goto out;
3164         ret = -ERANGE; /* see getxattr(2) man page */
3165         if (acl->len > buflen)
3166                 goto out;
3167         memcpy(buf, acl->data, acl->len);
3168 out_len:
3169         ret = acl->len;
3170 out:
3171         spin_unlock(&inode->i_lock);
3172         return ret;
3173 }
3174
3175 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
3176 {
3177         struct nfs4_cached_acl *acl;
3178
3179         if (buf && acl_len <= PAGE_SIZE) {
3180                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3181                 if (acl == NULL)
3182                         goto out;
3183                 acl->cached = 1;
3184                 memcpy(acl->data, buf, acl_len);
3185         } else {
3186                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3187                 if (acl == NULL)
3188                         goto out;
3189                 acl->cached = 0;
3190         }
3191         acl->len = acl_len;
3192 out:
3193         nfs4_set_cached_acl(inode, acl);
3194 }
3195
3196 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3197 {
3198         struct page *pages[NFS4ACL_MAXPAGES];
3199         struct nfs_getaclargs args = {
3200                 .fh = NFS_FH(inode),
3201                 .acl_pages = pages,
3202                 .acl_len = buflen,
3203         };
3204         struct nfs_getaclres res = {
3205                 .acl_len = buflen,
3206         };
3207         void *resp_buf;
3208         struct rpc_message msg = {
3209                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3210                 .rpc_argp = &args,
3211                 .rpc_resp = &res,
3212         };
3213         struct page *localpage = NULL;
3214         int ret;
3215
3216         if (buflen < PAGE_SIZE) {
3217                 /* As long as we're doing a round trip to the server anyway,
3218                  * let's be prepared for a page of acl data. */
3219                 localpage = alloc_page(GFP_KERNEL);
3220                 resp_buf = page_address(localpage);
3221                 if (localpage == NULL)
3222                         return -ENOMEM;
3223                 args.acl_pages[0] = localpage;
3224                 args.acl_pgbase = 0;
3225                 args.acl_len = PAGE_SIZE;
3226         } else {
3227                 resp_buf = buf;
3228                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
3229         }
3230         ret = nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
3231         if (ret)
3232                 goto out_free;
3233         if (res.acl_len > args.acl_len)
3234                 nfs4_write_cached_acl(inode, NULL, res.acl_len);
3235         else
3236                 nfs4_write_cached_acl(inode, resp_buf, res.acl_len);
3237         if (buf) {
3238                 ret = -ERANGE;
3239                 if (res.acl_len > buflen)
3240                         goto out_free;
3241                 if (localpage)
3242                         memcpy(buf, resp_buf, res.acl_len);
3243         }
3244         ret = res.acl_len;
3245 out_free:
3246         if (localpage)
3247                 __free_page(localpage);
3248         return ret;
3249 }
3250
3251 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3252 {
3253         struct nfs4_exception exception = { };
3254         ssize_t ret;
3255         do {
3256                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3257                 if (ret >= 0)
3258                         break;
3259                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3260         } while (exception.retry);
3261         return ret;
3262 }
3263
3264 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3265 {
3266         struct nfs_server *server = NFS_SERVER(inode);
3267         int ret;
3268
3269         if (!nfs4_server_supports_acls(server))
3270                 return -EOPNOTSUPP;
3271         ret = nfs_revalidate_inode(server, inode);
3272         if (ret < 0)
3273                 return ret;
3274         ret = nfs4_read_cached_acl(inode, buf, buflen);
3275         if (ret != -ENOENT)
3276                 return ret;
3277         return nfs4_get_acl_uncached(inode, buf, buflen);
3278 }
3279
3280 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3281 {
3282         struct nfs_server *server = NFS_SERVER(inode);
3283         struct page *pages[NFS4ACL_MAXPAGES];
3284         struct nfs_setaclargs arg = {
3285                 .fh             = NFS_FH(inode),
3286                 .acl_pages      = pages,
3287                 .acl_len        = buflen,
3288         };
3289         struct nfs_setaclres res;
3290         struct rpc_message msg = {
3291                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3292                 .rpc_argp       = &arg,
3293                 .rpc_resp       = &res,
3294         };
3295         int ret;
3296
3297         if (!nfs4_server_supports_acls(server))
3298                 return -EOPNOTSUPP;
3299         nfs_inode_return_delegation(inode);
3300         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3301         ret = nfs4_call_sync(server, &msg, &arg, &res, 1);
3302         nfs_access_zap_cache(inode);
3303         nfs_zap_acl_cache(inode);
3304         return ret;
3305 }
3306
3307 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3308 {
3309         struct nfs4_exception exception = { };
3310         int err;
3311         do {
3312                 err = nfs4_handle_exception(NFS_SERVER(inode),
3313                                 __nfs4_proc_set_acl(inode, buf, buflen),
3314                                 &exception);
3315         } while (exception.retry);
3316         return err;
3317 }
3318
3319 static int
3320 _nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs_client *clp, struct nfs4_state *state)
3321 {
3322         if (!clp || task->tk_status >= 0)
3323                 return 0;
3324         switch(task->tk_status) {
3325                 case -NFS4ERR_ADMIN_REVOKED:
3326                 case -NFS4ERR_BAD_STATEID:
3327                 case -NFS4ERR_OPENMODE:
3328                         if (state == NULL)
3329                                 break;
3330                         nfs4_state_mark_reclaim_nograce(clp, state);
3331                 case -NFS4ERR_STALE_CLIENTID:
3332                 case -NFS4ERR_STALE_STATEID:
3333                 case -NFS4ERR_EXPIRED:
3334                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3335                         nfs4_schedule_state_recovery(clp);
3336                         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3337                                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3338                         task->tk_status = 0;
3339                         return -EAGAIN;
3340 #if defined(CONFIG_NFS_V4_1)
3341                 case -NFS4ERR_BADSESSION:
3342                 case -NFS4ERR_BADSLOT:
3343                 case -NFS4ERR_BAD_HIGH_SLOT:
3344                 case -NFS4ERR_DEADSESSION:
3345                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3346                 case -NFS4ERR_SEQ_FALSE_RETRY:
3347                 case -NFS4ERR_SEQ_MISORDERED:
3348                         dprintk("%s ERROR %d, Reset session\n", __func__,
3349                                 task->tk_status);
3350                         nfs4_schedule_state_recovery(clp);
3351                         task->tk_status = 0;
3352                         return -EAGAIN;
3353 #endif /* CONFIG_NFS_V4_1 */
3354                 case -NFS4ERR_DELAY:
3355                         if (server)
3356                                 nfs_inc_server_stats(server, NFSIOS_DELAY);
3357                 case -NFS4ERR_GRACE:
3358                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3359                         task->tk_status = 0;
3360                         return -EAGAIN;
3361                 case -NFS4ERR_OLD_STATEID:
3362                         task->tk_status = 0;
3363                         return -EAGAIN;
3364         }
3365         task->tk_status = nfs4_map_errors(task->tk_status);
3366         return 0;
3367 }
3368
3369 static int
3370 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3371 {
3372         return _nfs4_async_handle_error(task, server, server->nfs_client, state);
3373 }
3374
3375 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
3376 {
3377         nfs4_verifier sc_verifier;
3378         struct nfs4_setclientid setclientid = {
3379                 .sc_verifier = &sc_verifier,
3380                 .sc_prog = program,
3381         };
3382         struct rpc_message msg = {
3383                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3384                 .rpc_argp = &setclientid,
3385                 .rpc_resp = clp,
3386                 .rpc_cred = cred,
3387         };
3388         __be32 *p;
3389         int loop = 0;
3390         int status;
3391
3392         p = (__be32*)sc_verifier.data;
3393         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3394         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3395
3396         for(;;) {
3397                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3398                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3399                                 clp->cl_ipaddr,
3400                                 rpc_peeraddr2str(clp->cl_rpcclient,
3401                                                         RPC_DISPLAY_ADDR),
3402                                 rpc_peeraddr2str(clp->cl_rpcclient,
3403                                                         RPC_DISPLAY_PROTO),
3404                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3405                                 clp->cl_id_uniquifier);
3406                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3407                                 sizeof(setclientid.sc_netid),
3408                                 rpc_peeraddr2str(clp->cl_rpcclient,
3409                                                         RPC_DISPLAY_NETID));
3410                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3411                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3412                                 clp->cl_ipaddr, port >> 8, port & 255);
3413
3414                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3415                 if (status != -NFS4ERR_CLID_INUSE)
3416                         break;
3417                 if (signalled())
3418                         break;
3419                 if (loop++ & 1)
3420                         ssleep(clp->cl_lease_time + 1);
3421                 else
3422                         if (++clp->cl_id_uniquifier == 0)
3423                                 break;
3424         }
3425         return status;
3426 }
3427
3428 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
3429 {
3430         struct nfs_fsinfo fsinfo;
3431         struct rpc_message msg = {
3432                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3433                 .rpc_argp = clp,
3434                 .rpc_resp = &fsinfo,
3435                 .rpc_cred = cred,
3436         };
3437         unsigned long now;
3438         int status;
3439
3440         now = jiffies;
3441         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3442         if (status == 0) {
3443                 spin_lock(&clp->cl_lock);
3444                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3445                 clp->cl_last_renewal = now;
3446                 spin_unlock(&clp->cl_lock);
3447         }
3448         return status;
3449 }
3450
3451 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
3452 {
3453         long timeout = 0;
3454         int err;
3455         do {
3456                 err = _nfs4_proc_setclientid_confirm(clp, cred);
3457                 switch (err) {
3458                         case 0:
3459                                 return err;
3460                         case -NFS4ERR_RESOURCE:
3461                                 /* The IBM lawyers misread another document! */
3462                         case -NFS4ERR_DELAY:
3463                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
3464                 }
3465         } while (err == 0);
3466         return err;
3467 }
3468
3469 struct nfs4_delegreturndata {
3470         struct nfs4_delegreturnargs args;
3471         struct nfs4_delegreturnres res;
3472         struct nfs_fh fh;
3473         nfs4_stateid stateid;
3474         unsigned long timestamp;
3475         struct nfs_fattr fattr;
3476         int rpc_status;
3477 };
3478
3479 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3480 {
3481         struct nfs4_delegreturndata *data = calldata;
3482
3483         nfs4_sequence_done(data->res.server, &data->res.seq_res,
3484                         task->tk_status);
3485
3486         data->rpc_status = task->tk_status;
3487         if (data->rpc_status == 0)
3488                 renew_lease(data->res.server, data->timestamp);
3489 }
3490
3491 static void nfs4_delegreturn_release(void *calldata)
3492 {
3493         kfree(calldata);
3494 }
3495
3496 #if defined(CONFIG_NFS_V4_1)
3497 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3498 {
3499         struct nfs4_delegreturndata *d_data;
3500
3501         d_data = (struct nfs4_delegreturndata *)data;
3502
3503         if (nfs4_setup_sequence(d_data->res.server->nfs_client,
3504                                 &d_data->args.seq_args,
3505                                 &d_data->res.seq_res, 1, task))
3506                 return;
3507         rpc_call_start(task);
3508 }
3509 #endif /* CONFIG_NFS_V4_1 */
3510
3511 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3512 #if defined(CONFIG_NFS_V4_1)
3513         .rpc_call_prepare = nfs4_delegreturn_prepare,
3514 #endif /* CONFIG_NFS_V4_1 */
3515         .rpc_call_done = nfs4_delegreturn_done,
3516         .rpc_release = nfs4_delegreturn_release,
3517 };
3518
3519 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3520 {
3521         struct nfs4_delegreturndata *data;
3522         struct nfs_server *server = NFS_SERVER(inode);
3523         struct rpc_task *task;
3524         struct rpc_message msg = {
3525                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3526                 .rpc_cred = cred,
3527         };
3528         struct rpc_task_setup task_setup_data = {
3529                 .rpc_client = server->client,
3530                 .rpc_message = &msg,
3531                 .callback_ops = &nfs4_delegreturn_ops,
3532                 .flags = RPC_TASK_ASYNC,
3533         };
3534         int status = 0;
3535
3536         data = kzalloc(sizeof(*data), GFP_KERNEL);
3537         if (data == NULL)
3538                 return -ENOMEM;
3539         data->args.fhandle = &data->fh;
3540         data->args.stateid = &data->stateid;
3541         data->args.bitmask = server->attr_bitmask;
3542         nfs_copy_fh(&data->fh, NFS_FH(inode));
3543         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3544         data->res.fattr = &data->fattr;
3545         data->res.server = server;
3546         data->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3547         nfs_fattr_init(data->res.fattr);
3548         data->timestamp = jiffies;
3549         data->rpc_status = 0;
3550
3551         task_setup_data.callback_data = data;
3552         msg.rpc_argp = &data->args,
3553         msg.rpc_resp = &data->res,
3554         task = rpc_run_task(&task_setup_data);
3555         if (IS_ERR(task))
3556                 return PTR_ERR(task);
3557         if (!issync)
3558                 goto out;
3559         status = nfs4_wait_for_completion_rpc_task(task);
3560         if (status != 0)
3561                 goto out;
3562         status = data->rpc_status;
3563         if (status != 0)
3564                 goto out;
3565         nfs_refresh_inode(inode, &data->fattr);
3566 out:
3567         rpc_put_task(task);
3568         return status;
3569 }
3570
3571 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3572 {
3573         struct nfs_server *server = NFS_SERVER(inode);
3574         struct nfs4_exception exception = { };
3575         int err;
3576         do {
3577                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3578                 switch (err) {
3579                         case -NFS4ERR_STALE_STATEID:
3580                         case -NFS4ERR_EXPIRED:
3581                         case 0:
3582                                 return 0;
3583                 }
3584                 err = nfs4_handle_exception(server, err, &exception);
3585         } while (exception.retry);
3586         return err;
3587 }
3588
3589 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3590 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3591
3592 /* 
3593  * sleep, with exponential backoff, and retry the LOCK operation. 
3594  */
3595 static unsigned long
3596 nfs4_set_lock_task_retry(unsigned long timeout)
3597 {
3598         schedule_timeout_killable(timeout);
3599         timeout <<= 1;
3600         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3601                 return NFS4_LOCK_MAXTIMEOUT;
3602         return timeout;
3603 }
3604
3605 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3606 {
3607         struct inode *inode = state->inode;
3608         struct nfs_server *server = NFS_SERVER(inode);
3609         struct nfs_client *clp = server->nfs_client;
3610         struct nfs_lockt_args arg = {
3611                 .fh = NFS_FH(inode),
3612                 .fl = request,
3613         };
3614         struct nfs_lockt_res res = {
3615                 .denied = request,
3616         };
3617         struct rpc_message msg = {
3618                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3619                 .rpc_argp       = &arg,
3620                 .rpc_resp       = &res,
3621                 .rpc_cred       = state->owner->so_cred,
3622         };
3623         struct nfs4_lock_state *lsp;
3624         int status;
3625
3626         arg.lock_owner.clientid = clp->cl_clientid;
3627         status = nfs4_set_lock_state(state, request);
3628         if (status != 0)
3629                 goto out;
3630         lsp = request->fl_u.nfs4_fl.owner;
3631         arg.lock_owner.id = lsp->ls_id.id;
3632         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
3633         switch (status) {
3634                 case 0:
3635                         request->fl_type = F_UNLCK;
3636                         break;
3637                 case -NFS4ERR_DENIED:
3638                         status = 0;
3639         }
3640         request->fl_ops->fl_release_private(request);
3641 out:
3642         return status;
3643 }
3644
3645 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3646 {
3647         struct nfs4_exception exception = { };
3648         int err;
3649
3650         do {
3651                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3652                                 _nfs4_proc_getlk(state, cmd, request),
3653                                 &exception);
3654         } while (exception.retry);
3655         return err;
3656 }
3657
3658 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3659 {
3660         int res = 0;
3661         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3662                 case FL_POSIX:
3663                         res = posix_lock_file_wait(file, fl);
3664                         break;
3665                 case FL_FLOCK:
3666                         res = flock_lock_file_wait(file, fl);
3667                         break;
3668                 default:
3669                         BUG();
3670         }
3671         return res;
3672 }
3673
3674 struct nfs4_unlockdata {
3675         struct nfs_locku_args arg;
3676         struct nfs_locku_res res;
3677         struct nfs4_lock_state *lsp;
3678         struct nfs_open_context *ctx;
3679         struct file_lock fl;
3680         const struct nfs_server *server;
3681         unsigned long timestamp;
3682 };
3683
3684 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3685                 struct nfs_open_context *ctx,
3686                 struct nfs4_lock_state *lsp,
3687                 struct nfs_seqid *seqid)
3688 {
3689         struct nfs4_unlockdata *p;
3690         struct inode *inode = lsp->ls_state->inode;
3691
3692         p = kzalloc(sizeof(*p), GFP_KERNEL);
3693         if (p == NULL)
3694                 return NULL;
3695         p->arg.fh = NFS_FH(inode);
3696         p->arg.fl = &p->fl;
3697         p->arg.seqid = seqid;
3698         p->res.seqid = seqid;
3699         p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3700         p->arg.stateid = &lsp->ls_stateid;
3701         p->lsp = lsp;
3702         atomic_inc(&lsp->ls_count);
3703         /* Ensure we don't close file until we're done freeing locks! */
3704         p->ctx = get_nfs_open_context(ctx);
3705         memcpy(&p->fl, fl, sizeof(p->fl));
3706         p->server = NFS_SERVER(inode);
3707         return p;
3708 }
3709
3710 static void nfs4_locku_release_calldata(void *data)
3711 {
3712         struct nfs4_unlockdata *calldata = data;
3713         nfs_free_seqid(calldata->arg.seqid);
3714         nfs4_put_lock_state(calldata->lsp);
3715         put_nfs_open_context(calldata->ctx);
3716         kfree(calldata);
3717 }
3718
3719 static void nfs4_locku_done(struct rpc_task *task, void *data)
3720 {
3721         struct nfs4_unlockdata *calldata = data;
3722
3723         nfs4_sequence_done(calldata->server, &calldata->res.seq_res,
3724                            task->tk_status);
3725         if (RPC_ASSASSINATED(task))
3726                 return;
3727         switch (task->tk_status) {
3728                 case 0:
3729                         memcpy(calldata->lsp->ls_stateid.data,
3730                                         calldata->res.stateid.data,
3731                                         sizeof(calldata->lsp->ls_stateid.data));
3732                         renew_lease(calldata->server, calldata->timestamp);
3733                         break;
3734                 case -NFS4ERR_BAD_STATEID:
3735                 case -NFS4ERR_OLD_STATEID:
3736                 case -NFS4ERR_STALE_STATEID:
3737                 case -NFS4ERR_EXPIRED:
3738                         break;
3739                 default:
3740                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
3741                                 nfs4_restart_rpc(task,
3742                                                  calldata->server->nfs_client);
3743         }
3744 }
3745
3746 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3747 {
3748         struct nfs4_unlockdata *calldata = data;
3749
3750         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3751                 return;
3752         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3753                 /* Note: exit _without_ running nfs4_locku_done */
3754                 task->tk_action = NULL;
3755                 return;
3756         }
3757         calldata->timestamp = jiffies;
3758         if (nfs4_setup_sequence(calldata->server->nfs_client,
3759                                 &calldata->arg.seq_args,
3760                                 &calldata->res.seq_res, 1, task))
3761                 return;
3762         rpc_call_start(task);
3763 }
3764
3765 static const struct rpc_call_ops nfs4_locku_ops = {
3766         .rpc_call_prepare = nfs4_locku_prepare,
3767         .rpc_call_done = nfs4_locku_done,
3768         .rpc_release = nfs4_locku_release_calldata,
3769 };
3770
3771 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3772                 struct nfs_open_context *ctx,
3773                 struct nfs4_lock_state *lsp,
3774                 struct nfs_seqid *seqid)
3775 {
3776         struct nfs4_unlockdata *data;
3777         struct rpc_message msg = {
3778                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3779                 .rpc_cred = ctx->cred,
3780         };
3781         struct rpc_task_setup task_setup_data = {
3782                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
3783                 .rpc_message = &msg,
3784                 .callback_ops = &nfs4_locku_ops,
3785                 .workqueue = nfsiod_workqueue,
3786                 .flags = RPC_TASK_ASYNC,
3787         };
3788
3789         /* Ensure this is an unlock - when canceling a lock, the
3790          * canceled lock is passed in, and it won't be an unlock.
3791          */
3792         fl->fl_type = F_UNLCK;
3793
3794         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3795         if (data == NULL) {
3796                 nfs_free_seqid(seqid);
3797                 return ERR_PTR(-ENOMEM);
3798         }
3799
3800         msg.rpc_argp = &data->arg,
3801         msg.rpc_resp = &data->res,
3802         task_setup_data.callback_data = data;
3803         return rpc_run_task(&task_setup_data);
3804 }
3805
3806 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3807 {
3808         struct nfs_inode *nfsi = NFS_I(state->inode);
3809         struct nfs_seqid *seqid;
3810         struct nfs4_lock_state *lsp;
3811         struct rpc_task *task;
3812         int status = 0;
3813         unsigned char fl_flags = request->fl_flags;
3814
3815         status = nfs4_set_lock_state(state, request);
3816         /* Unlock _before_ we do the RPC call */
3817         request->fl_flags |= FL_EXISTS;
3818         down_read(&nfsi->rwsem);
3819         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
3820                 up_read(&nfsi->rwsem);
3821                 goto out;
3822         }
3823         up_read(&nfsi->rwsem);
3824         if (status != 0)
3825                 goto out;
3826         /* Is this a delegated lock? */
3827         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3828                 goto out;
3829         lsp = request->fl_u.nfs4_fl.owner;
3830         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3831         status = -ENOMEM;
3832         if (seqid == NULL)
3833                 goto out;
3834         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
3835         status = PTR_ERR(task);
3836         if (IS_ERR(task))
3837                 goto out;
3838         status = nfs4_wait_for_completion_rpc_task(task);
3839         rpc_put_task(task);
3840 out:
3841         request->fl_flags = fl_flags;
3842         return status;
3843 }
3844
3845 struct nfs4_lockdata {
3846         struct nfs_lock_args arg;
3847         struct nfs_lock_res res;
3848         struct nfs4_lock_state *lsp;
3849         struct nfs_open_context *ctx;
3850         struct file_lock fl;
3851         unsigned long timestamp;
3852         int rpc_status;
3853         int cancelled;
3854         struct nfs_server *server;
3855 };
3856
3857 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3858                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3859 {
3860         struct nfs4_lockdata *p;
3861         struct inode *inode = lsp->ls_state->inode;
3862         struct nfs_server *server = NFS_SERVER(inode);
3863
3864         p = kzalloc(sizeof(*p), GFP_KERNEL);
3865         if (p == NULL)
3866                 return NULL;
3867
3868         p->arg.fh = NFS_FH(inode);
3869         p->arg.fl = &p->fl;
3870         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid);
3871         if (p->arg.open_seqid == NULL)
3872                 goto out_free;
3873         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3874         if (p->arg.lock_seqid == NULL)
3875                 goto out_free_seqid;
3876         p->arg.lock_stateid = &lsp->ls_stateid;
3877         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3878         p->arg.lock_owner.id = lsp->ls_id.id;
3879         p->res.lock_seqid = p->arg.lock_seqid;
3880         p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3881         p->lsp = lsp;
3882         p->server = server;
3883         atomic_inc(&lsp->ls_count);
3884         p->ctx = get_nfs_open_context(ctx);
3885         memcpy(&p->fl, fl, sizeof(p->fl));
3886         return p;
3887 out_free_seqid:
3888         nfs_free_seqid(p->arg.open_seqid);
3889 out_free:
3890         kfree(p);
3891         return NULL;
3892 }
3893
3894 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3895 {
3896         struct nfs4_lockdata *data = calldata;
3897         struct nfs4_state *state = data->lsp->ls_state;
3898
3899         dprintk("%s: begin!\n", __func__);
3900         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3901                 return;
3902         /* Do we need to do an open_to_lock_owner? */
3903         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3904                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
3905                         return;
3906                 data->arg.open_stateid = &state->stateid;
3907                 data->arg.new_lock_owner = 1;
3908                 data->res.open_seqid = data->arg.open_seqid;
3909         } else
3910                 data->arg.new_lock_owner = 0;
3911         data->timestamp = jiffies;
3912         if (nfs4_setup_sequence(data->server->nfs_client, &data->arg.seq_args,
3913                                 &data->res.seq_res, 1, task))
3914                 return;
3915         rpc_call_start(task);
3916         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
3917 }
3918
3919 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3920 {
3921         struct nfs4_lockdata *data = calldata;
3922
3923         dprintk("%s: begin!\n", __func__);
3924
3925         nfs4_sequence_done(data->server, &data->res.seq_res,
3926                         task->tk_status);
3927
3928         data->rpc_status = task->tk_status;
3929         if (RPC_ASSASSINATED(task))
3930                 goto out;
3931         if (data->arg.new_lock_owner != 0) {
3932                 if (data->rpc_status == 0)
3933                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3934                 else
3935                         goto out;
3936         }
3937         if (data->rpc_status == 0) {
3938                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3939                                         sizeof(data->lsp->ls_stateid.data));
3940                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3941                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
3942         }
3943 out:
3944         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
3945 }
3946
3947 static void nfs4_lock_release(void *calldata)
3948 {
3949         struct nfs4_lockdata *data = calldata;
3950
3951         dprintk("%s: begin!\n", __func__);
3952         nfs_free_seqid(data->arg.open_seqid);
3953         if (data->cancelled != 0) {
3954                 struct rpc_task *task;
3955                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3956                                 data->arg.lock_seqid);
3957                 if (!IS_ERR(task))
3958                         rpc_put_task(task);
3959                 dprintk("%s: cancelling lock!\n", __func__);
3960         } else
3961                 nfs_free_seqid(data->arg.lock_seqid);
3962         nfs4_put_lock_state(data->lsp);
3963         put_nfs_open_context(data->ctx);
3964         kfree(data);
3965         dprintk("%s: done!\n", __func__);
3966 }
3967
3968 static const struct rpc_call_ops nfs4_lock_ops = {
3969         .rpc_call_prepare = nfs4_lock_prepare,
3970         .rpc_call_done = nfs4_lock_done,
3971         .rpc_release = nfs4_lock_release,
3972 };
3973
3974 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3975 {
3976         struct nfs4_lockdata *data;
3977         struct rpc_task *task;
3978         struct rpc_message msg = {
3979                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3980                 .rpc_cred = state->owner->so_cred,
3981         };
3982         struct rpc_task_setup task_setup_data = {
3983                 .rpc_client = NFS_CLIENT(state->inode),
3984                 .rpc_message = &msg,
3985                 .callback_ops = &nfs4_lock_ops,
3986                 .workqueue = nfsiod_workqueue,
3987                 .flags = RPC_TASK_ASYNC,
3988         };
3989         int ret;
3990
3991         dprintk("%s: begin!\n", __func__);
3992         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
3993                         fl->fl_u.nfs4_fl.owner);
3994         if (data == NULL)
3995                 return -ENOMEM;
3996         if (IS_SETLKW(cmd))
3997                 data->arg.block = 1;
3998         if (reclaim != 0)
3999                 data->arg.reclaim = 1;
4000         msg.rpc_argp = &data->arg,
4001         msg.rpc_resp = &data->res,
4002         task_setup_data.callback_data = data;
4003         task = rpc_run_task(&task_setup_data);
4004         if (IS_ERR(task))
4005                 return PTR_ERR(task);
4006         ret = nfs4_wait_for_completion_rpc_task(task);
4007         if (ret == 0) {
4008                 ret = data->rpc_status;
4009         } else
4010                 data->cancelled = 1;
4011         rpc_put_task(task);
4012         dprintk("%s: done, ret = %d!\n", __func__, ret);
4013         return ret;
4014 }
4015
4016 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4017 {
4018         struct nfs_server *server = NFS_SERVER(state->inode);
4019         struct nfs4_exception exception = { };
4020         int err;
4021
4022         do {
4023                 /* Cache the lock if possible... */
4024                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4025                         return 0;
4026                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
4027                 if (err != -NFS4ERR_DELAY)
4028                         break;
4029                 nfs4_handle_exception(server, err, &exception);
4030         } while (exception.retry);
4031         return err;
4032 }
4033
4034 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4035 {
4036         struct nfs_server *server = NFS_SERVER(state->inode);
4037         struct nfs4_exception exception = { };
4038         int err;
4039
4040         err = nfs4_set_lock_state(state, request);
4041         if (err != 0)
4042                 return err;
4043         do {
4044                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4045                         return 0;
4046                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
4047                 switch (err) {
4048                 default:
4049                         goto out;
4050                 case -NFS4ERR_GRACE:
4051                 case -NFS4ERR_DELAY:
4052                         nfs4_handle_exception(server, err, &exception);
4053                         err = 0;
4054                 }
4055         } while (exception.retry);
4056 out:
4057         return err;
4058 }
4059
4060 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4061 {
4062         struct nfs_inode *nfsi = NFS_I(state->inode);
4063         unsigned char fl_flags = request->fl_flags;
4064         int status;
4065
4066         /* Is this a delegated open? */
4067         status = nfs4_set_lock_state(state, request);
4068         if (status != 0)
4069                 goto out;
4070         request->fl_flags |= FL_ACCESS;
4071         status = do_vfs_lock(request->fl_file, request);
4072         if (status < 0)
4073                 goto out;
4074         down_read(&nfsi->rwsem);
4075         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4076                 /* Yes: cache locks! */
4077                 /* ...but avoid races with delegation recall... */
4078                 request->fl_flags = fl_flags & ~FL_SLEEP;
4079                 status = do_vfs_lock(request->fl_file, request);
4080                 goto out_unlock;
4081         }
4082         status = _nfs4_do_setlk(state, cmd, request, 0);
4083         if (status != 0)
4084                 goto out_unlock;
4085         /* Note: we always want to sleep here! */
4086         request->fl_flags = fl_flags | FL_SLEEP;
4087         if (do_vfs_lock(request->fl_file, request) < 0)
4088                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4089 out_unlock:
4090         up_read(&nfsi->rwsem);
4091 out:
4092         request->fl_flags = fl_flags;
4093         return status;
4094 }
4095
4096 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4097 {
4098         struct nfs4_exception exception = { };
4099         int err;
4100
4101         do {
4102                 err = _nfs4_proc_setlk(state, cmd, request);
4103                 if (err == -NFS4ERR_DENIED)
4104                         err = -EAGAIN;
4105                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4106                                 err, &exception);
4107         } while (exception.retry);
4108         return err;
4109 }
4110
4111 static int
4112 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4113 {
4114         struct nfs_open_context *ctx;
4115         struct nfs4_state *state;
4116         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4117         int status;
4118
4119         /* verify open state */
4120         ctx = nfs_file_open_context(filp);
4121         state = ctx->state;
4122
4123         if (request->fl_start < 0 || request->fl_end < 0)
4124                 return -EINVAL;
4125
4126         if (IS_GETLK(cmd)) {
4127                 if (state != NULL)
4128                         return nfs4_proc_getlk(state, F_GETLK, request);
4129                 return 0;
4130         }
4131
4132         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4133                 return -EINVAL;
4134
4135         if (request->fl_type == F_UNLCK) {
4136                 if (state != NULL)
4137                         return nfs4_proc_unlck(state, cmd, request);
4138                 return 0;
4139         }
4140
4141         if (state == NULL)
4142                 return -ENOLCK;
4143         do {
4144                 status = nfs4_proc_setlk(state, cmd, request);
4145                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4146                         break;
4147                 timeout = nfs4_set_lock_task_retry(timeout);
4148                 status = -ERESTARTSYS;
4149                 if (signalled())
4150                         break;
4151         } while(status < 0);
4152         return status;
4153 }
4154
4155 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4156 {
4157         struct nfs_server *server = NFS_SERVER(state->inode);
4158         struct nfs4_exception exception = { };
4159         int err;
4160
4161         err = nfs4_set_lock_state(state, fl);
4162         if (err != 0)
4163                 goto out;
4164         do {
4165                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
4166                 switch (err) {
4167                         default:
4168                                 printk(KERN_ERR "%s: unhandled error %d.\n",
4169                                                 __func__, err);
4170                         case 0:
4171                         case -ESTALE:
4172                                 goto out;
4173                         case -NFS4ERR_EXPIRED:
4174                         case -NFS4ERR_STALE_CLIENTID:
4175                         case -NFS4ERR_STALE_STATEID:
4176                                 nfs4_schedule_state_recovery(server->nfs_client);
4177                                 goto out;
4178                         case -ERESTARTSYS:
4179                                 /*
4180                                  * The show must go on: exit, but mark the
4181                                  * stateid as needing recovery.
4182                                  */
4183                         case -NFS4ERR_ADMIN_REVOKED:
4184                         case -NFS4ERR_BAD_STATEID:
4185                         case -NFS4ERR_OPENMODE:
4186                                 nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
4187                                 err = 0;
4188                                 goto out;
4189                         case -ENOMEM:
4190                         case -NFS4ERR_DENIED:
4191                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4192                                 err = 0;
4193                                 goto out;
4194                         case -NFS4ERR_DELAY:
4195                                 break;
4196                 }
4197                 err = nfs4_handle_exception(server, err, &exception);
4198         } while (exception.retry);
4199 out:
4200         return err;
4201 }
4202
4203 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4204
4205 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
4206                 size_t buflen, int flags)
4207 {
4208         struct inode *inode = dentry->d_inode;
4209
4210         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
4211                 return -EOPNOTSUPP;
4212
4213         return nfs4_proc_set_acl(inode, buf, buflen);
4214 }
4215
4216 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
4217  * and that's what we'll do for e.g. user attributes that haven't been set.
4218  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
4219  * attributes in kernel-managed attribute namespaces. */
4220 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
4221                 size_t buflen)
4222 {
4223         struct inode *inode = dentry->d_inode;
4224
4225         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
4226                 return -EOPNOTSUPP;
4227
4228         return nfs4_proc_get_acl(inode, buf, buflen);
4229 }
4230
4231 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
4232 {
4233         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
4234
4235         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4236                 return 0;
4237         if (buf && buflen < len)
4238                 return -ERANGE;
4239         if (buf)
4240                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
4241         return len;
4242 }
4243
4244 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4245 {
4246         if (!((fattr->valid & NFS_ATTR_FATTR_FILEID) &&
4247                 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4248                 (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4249                 return;
4250
4251         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4252                 NFS_ATTR_FATTR_NLINK;
4253         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4254         fattr->nlink = 2;
4255 }
4256
4257 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4258                 struct nfs4_fs_locations *fs_locations, struct page *page)
4259 {
4260         struct nfs_server *server = NFS_SERVER(dir);
4261         u32 bitmask[2] = {
4262                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4263                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
4264         };
4265         struct nfs4_fs_locations_arg args = {
4266                 .dir_fh = NFS_FH(dir),
4267                 .name = name,
4268                 .page = page,
4269                 .bitmask = bitmask,
4270         };
4271         struct nfs4_fs_locations_res res = {
4272                 .fs_locations = fs_locations,
4273         };
4274         struct rpc_message msg = {
4275                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4276                 .rpc_argp = &args,
4277                 .rpc_resp = &res,
4278         };
4279         int status;
4280
4281         dprintk("%s: start\n", __func__);
4282         nfs_fattr_init(&fs_locations->fattr);
4283         fs_locations->server = server;
4284         fs_locations->nlocations = 0;
4285         status = nfs4_call_sync(server, &msg, &args, &res, 0);
4286         nfs_fixup_referral_attributes(&fs_locations->fattr);
4287         dprintk("%s: returned status = %d\n", __func__, status);
4288         return status;
4289 }
4290
4291 #ifdef CONFIG_NFS_V4_1
4292 /*
4293  * nfs4_proc_exchange_id()
4294  *
4295  * Since the clientid has expired, all compounds using sessions
4296  * associated with the stale clientid will be returning
4297  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4298  * be in some phase of session reset.
4299  */
4300 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4301 {
4302         nfs4_verifier verifier;
4303         struct nfs41_exchange_id_args args = {
4304                 .client = clp,
4305                 .flags = clp->cl_exchange_flags,
4306         };
4307         struct nfs41_exchange_id_res res = {
4308                 .client = clp,
4309         };
4310         int status;
4311         struct rpc_message msg = {
4312                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4313                 .rpc_argp = &args,
4314                 .rpc_resp = &res,
4315                 .rpc_cred = cred,
4316         };
4317         __be32 *p;
4318
4319         dprintk("--> %s\n", __func__);
4320         BUG_ON(clp == NULL);
4321
4322         /* Remove server-only flags */
4323         args.flags &= ~EXCHGID4_FLAG_CONFIRMED_R;
4324
4325         p = (u32 *)verifier.data;
4326         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4327         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
4328         args.verifier = &verifier;
4329
4330         while (1) {
4331                 args.id_len = scnprintf(args.id, sizeof(args.id),
4332                                         "%s/%s %u",
4333                                         clp->cl_ipaddr,
4334                                         rpc_peeraddr2str(clp->cl_rpcclient,
4335                                                          RPC_DISPLAY_ADDR),
4336                                         clp->cl_id_uniquifier);
4337
4338                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
4339
4340                 if (status != NFS4ERR_CLID_INUSE)
4341                         break;
4342
4343                 if (signalled())
4344                         break;
4345
4346                 if (++clp->cl_id_uniquifier == 0)
4347                         break;
4348         }
4349
4350         dprintk("<-- %s status= %d\n", __func__, status);
4351         return status;
4352 }
4353
4354 struct nfs4_get_lease_time_data {
4355         struct nfs4_get_lease_time_args *args;
4356         struct nfs4_get_lease_time_res *res;
4357         struct nfs_client *clp;
4358 };
4359
4360 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
4361                                         void *calldata)
4362 {
4363         int ret;
4364         struct nfs4_get_lease_time_data *data =
4365                         (struct nfs4_get_lease_time_data *)calldata;
4366
4367         dprintk("--> %s\n", __func__);
4368         /* just setup sequence, do not trigger session recovery
4369            since we're invoked within one */
4370         ret = nfs41_setup_sequence(data->clp->cl_session,
4371                                         &data->args->la_seq_args,
4372                                         &data->res->lr_seq_res, 0, task);
4373
4374         BUG_ON(ret == -EAGAIN);
4375         rpc_call_start(task);
4376         dprintk("<-- %s\n", __func__);
4377 }
4378
4379 /*
4380  * Called from nfs4_state_manager thread for session setup, so don't recover
4381  * from sequence operation or clientid errors.
4382  */
4383 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
4384 {
4385         struct nfs4_get_lease_time_data *data =
4386                         (struct nfs4_get_lease_time_data *)calldata;
4387
4388         dprintk("--> %s\n", __func__);
4389         nfs41_sequence_done(data->clp, &data->res->lr_seq_res, task->tk_status);
4390         switch (task->tk_status) {
4391         case -NFS4ERR_DELAY:
4392         case -NFS4ERR_GRACE:
4393                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
4394                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
4395                 task->tk_status = 0;
4396                 nfs4_restart_rpc(task, data->clp);
4397                 return;
4398         }
4399         dprintk("<-- %s\n", __func__);
4400 }
4401
4402 struct rpc_call_ops nfs4_get_lease_time_ops = {
4403         .rpc_call_prepare = nfs4_get_lease_time_prepare,
4404         .rpc_call_done = nfs4_get_lease_time_done,
4405 };
4406
4407 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
4408 {
4409         struct rpc_task *task;
4410         struct nfs4_get_lease_time_args args;
4411         struct nfs4_get_lease_time_res res = {
4412                 .lr_fsinfo = fsinfo,
4413         };
4414         struct nfs4_get_lease_time_data data = {
4415                 .args = &args,
4416                 .res = &res,
4417                 .clp = clp,
4418         };
4419         struct rpc_message msg = {
4420                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
4421                 .rpc_argp = &args,
4422                 .rpc_resp = &res,
4423         };
4424         struct rpc_task_setup task_setup = {
4425                 .rpc_client = clp->cl_rpcclient,
4426                 .rpc_message = &msg,
4427                 .callback_ops = &nfs4_get_lease_time_ops,
4428                 .callback_data = &data
4429         };
4430         int status;
4431
4432         res.lr_seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
4433         dprintk("--> %s\n", __func__);
4434         task = rpc_run_task(&task_setup);
4435
4436         if (IS_ERR(task))
4437                 status = PTR_ERR(task);
4438         else {
4439                 status = task->tk_status;
4440                 rpc_put_task(task);
4441         }
4442         dprintk("<-- %s return %d\n", __func__, status);
4443
4444         return status;
4445 }
4446
4447 /*
4448  * Reset a slot table
4449  */
4450 static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, int max_slots,
4451                 int old_max_slots, int ivalue)
4452 {
4453         int i;
4454         int ret = 0;
4455
4456         dprintk("--> %s: max_reqs=%u, tbl %p\n", __func__, max_slots, tbl);
4457
4458         /*
4459          * Until we have dynamic slot table adjustment, insist
4460          * upon the same slot table size
4461          */
4462         if (max_slots != old_max_slots) {
4463                 dprintk("%s reset slot table does't match old\n",
4464                         __func__);
4465                 ret = -EINVAL; /*XXX NFS4ERR_REQ_TOO_BIG ? */
4466                 goto out;
4467         }
4468         spin_lock(&tbl->slot_tbl_lock);
4469         for (i = 0; i < max_slots; ++i)
4470                 tbl->slots[i].seq_nr = ivalue;
4471         spin_unlock(&tbl->slot_tbl_lock);
4472         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4473                 tbl, tbl->slots, tbl->max_slots);
4474 out:
4475         dprintk("<-- %s: return %d\n", __func__, ret);
4476         return ret;
4477 }
4478
4479 /*
4480  * Reset the forechannel and backchannel slot tables
4481  */
4482 static int nfs4_reset_slot_tables(struct nfs4_session *session)
4483 {
4484         int status;
4485
4486         status = nfs4_reset_slot_table(&session->fc_slot_table,
4487                         session->fc_attrs.max_reqs,
4488                         session->fc_slot_table.max_slots,
4489                         1);
4490         if (status)
4491                 return status;
4492         init_completion(&session->complete);
4493
4494         status = nfs4_reset_slot_table(&session->bc_slot_table,
4495                         session->bc_attrs.max_reqs,
4496                         session->bc_slot_table.max_slots,
4497                         0);
4498         return status;
4499 }
4500
4501 /* Destroy the slot table */
4502 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
4503 {
4504         if (session->fc_slot_table.slots != NULL) {
4505                 kfree(session->fc_slot_table.slots);
4506                 session->fc_slot_table.slots = NULL;
4507         }
4508         if (session->bc_slot_table.slots != NULL) {
4509                 kfree(session->bc_slot_table.slots);
4510                 session->bc_slot_table.slots = NULL;
4511         }
4512         return;
4513 }
4514
4515 /*
4516  * Initialize slot table
4517  */
4518 static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
4519                 int max_slots, int ivalue)
4520 {
4521         struct nfs4_slot *slot;
4522         int ret = -ENOMEM;
4523
4524         BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);
4525
4526         dprintk("--> %s: max_reqs=%u\n", __func__, max_slots);
4527
4528         slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_KERNEL);
4529         if (!slot)
4530                 goto out;
4531         ret = 0;
4532
4533         spin_lock(&tbl->slot_tbl_lock);
4534         tbl->max_slots = max_slots;
4535         tbl->slots = slot;
4536         tbl->highest_used_slotid = -1;  /* no slot is currently used */
4537         spin_unlock(&tbl->slot_tbl_lock);
4538         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4539                 tbl, tbl->slots, tbl->max_slots);
4540 out:
4541         dprintk("<-- %s: return %d\n", __func__, ret);
4542         return ret;
4543 }
4544
4545 /*
4546  * Initialize the forechannel and backchannel tables
4547  */
4548 static int nfs4_init_slot_tables(struct nfs4_session *session)
4549 {
4550         struct nfs4_slot_table *tbl;
4551         int status = 0;
4552
4553         tbl = &session->fc_slot_table;
4554         if (tbl->slots == NULL) {
4555                 status = nfs4_init_slot_table(tbl,
4556                                 session->fc_attrs.max_reqs, 1);
4557                 if (status)
4558                         return status;
4559         }
4560
4561         tbl = &session->bc_slot_table;
4562         if (tbl->slots == NULL) {
4563                 status = nfs4_init_slot_table(tbl,
4564                                 session->bc_attrs.max_reqs, 0);
4565                 if (status)
4566                         nfs4_destroy_slot_tables(session);
4567         }
4568
4569         return status;
4570 }
4571
4572 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
4573 {
4574         struct nfs4_session *session;
4575         struct nfs4_slot_table *tbl;
4576
4577         session = kzalloc(sizeof(struct nfs4_session), GFP_KERNEL);
4578         if (!session)
4579                 return NULL;
4580
4581         /*
4582          * The create session reply races with the server back
4583          * channel probe. Mark the client NFS_CS_SESSION_INITING
4584          * so that the client back channel can find the
4585          * nfs_client struct
4586          */
4587         clp->cl_cons_state = NFS_CS_SESSION_INITING;
4588         init_completion(&session->complete);
4589
4590         tbl = &session->fc_slot_table;
4591         spin_lock_init(&tbl->slot_tbl_lock);
4592         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
4593
4594         tbl = &session->bc_slot_table;
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 nfs_fsinfo fsinfo;
4751         struct nfs4_session *session = clp->cl_session;
4752
4753         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
4754
4755         status = _nfs4_proc_create_session(clp);
4756         if (status)
4757                 goto out;
4758
4759         /* Init and reset the fore channel */
4760         status = nfs4_init_slot_tables(session);
4761         dprintk("slot table initialization returned %d\n", status);
4762         if (status)
4763                 goto out;
4764         status = nfs4_reset_slot_tables(session);
4765         dprintk("slot table reset returned %d\n", status);
4766         if (status)
4767                 goto out;
4768
4769         ptr = (unsigned *)&session->sess_id.data[0];
4770         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
4771                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
4772
4773         /* Get the lease time */
4774         status = nfs4_proc_get_lease_time(clp, &fsinfo);
4775         if (status == 0) {
4776                 /* Update lease time and schedule renewal */
4777                 spin_lock(&clp->cl_lock);
4778                 clp->cl_lease_time = fsinfo.lease_time * HZ;
4779                 clp->cl_last_renewal = jiffies;
4780                 spin_unlock(&clp->cl_lock);
4781
4782                 nfs4_schedule_state_renewal(clp);
4783         }
4784 out:
4785         dprintk("<-- %s\n", __func__);
4786         return status;
4787 }
4788
4789 /*
4790  * Issue the over-the-wire RPC DESTROY_SESSION.
4791  * The caller must serialize access to this routine.
4792  */
4793 int nfs4_proc_destroy_session(struct nfs4_session *session)
4794 {
4795         int status = 0;
4796         struct rpc_message msg;
4797
4798         dprintk("--> nfs4_proc_destroy_session\n");
4799
4800         /* session is still being setup */
4801         if (session->clp->cl_cons_state != NFS_CS_READY)
4802                 return status;
4803
4804         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
4805         msg.rpc_argp = session;
4806         msg.rpc_resp = NULL;
4807         msg.rpc_cred = NULL;
4808         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
4809
4810         if (status)
4811                 printk(KERN_WARNING
4812                         "Got error %d from the server on DESTROY_SESSION. "
4813                         "Session has been destroyed regardless...\n", status);
4814
4815         dprintk("<-- nfs4_proc_destroy_session\n");
4816         return status;
4817 }
4818
4819 int nfs4_init_session(struct nfs_server *server)
4820 {
4821         struct nfs_client *clp = server->nfs_client;
4822         struct nfs4_session *session;
4823         int ret;
4824
4825         if (!nfs4_has_session(clp))
4826                 return 0;
4827
4828         session = clp->cl_session;
4829         session->fc_attrs.max_rqst_sz = server->wsize + nfs41_maxwrite_overhead;
4830         session->fc_attrs.max_resp_sz = server->rsize + nfs41_maxread_overhead;
4831
4832         ret = nfs4_recover_expired_lease(server);
4833         if (!ret)
4834                 ret = nfs4_check_client_ready(clp);
4835         return ret;
4836 }
4837
4838 /*
4839  * Renew the cl_session lease.
4840  */
4841 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
4842 {
4843         struct nfs4_sequence_args args;
4844         struct nfs4_sequence_res res;
4845
4846         struct rpc_message msg = {
4847                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
4848                 .rpc_argp = &args,
4849                 .rpc_resp = &res,
4850                 .rpc_cred = cred,
4851         };
4852
4853         args.sa_cache_this = 0;
4854
4855         return nfs4_call_sync_sequence(clp, clp->cl_rpcclient, &msg, &args,
4856                                        &res, 0);
4857 }
4858
4859 void nfs41_sequence_call_done(struct rpc_task *task, void *data)
4860 {
4861         struct nfs_client *clp = (struct nfs_client *)data;
4862
4863         nfs41_sequence_done(clp, task->tk_msg.rpc_resp, task->tk_status);
4864
4865         if (task->tk_status < 0) {
4866                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
4867
4868                 if (_nfs4_async_handle_error(task, NULL, clp, NULL)
4869                                                                 == -EAGAIN) {
4870                         nfs4_restart_rpc(task, clp);
4871                         return;
4872                 }
4873         }
4874         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
4875
4876         kfree(task->tk_msg.rpc_argp);
4877         kfree(task->tk_msg.rpc_resp);
4878
4879         dprintk("<-- %s\n", __func__);
4880 }
4881
4882 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
4883 {
4884         struct nfs_client *clp;
4885         struct nfs4_sequence_args *args;
4886         struct nfs4_sequence_res *res;
4887
4888         clp = (struct nfs_client *)data;
4889         args = task->tk_msg.rpc_argp;
4890         res = task->tk_msg.rpc_resp;
4891
4892         if (nfs4_setup_sequence(clp, args, res, 0, task))
4893                 return;
4894         rpc_call_start(task);
4895 }
4896
4897 static const struct rpc_call_ops nfs41_sequence_ops = {
4898         .rpc_call_done = nfs41_sequence_call_done,
4899         .rpc_call_prepare = nfs41_sequence_prepare,
4900 };
4901
4902 static int nfs41_proc_async_sequence(struct nfs_client *clp,
4903                                      struct rpc_cred *cred)
4904 {
4905         struct nfs4_sequence_args *args;
4906         struct nfs4_sequence_res *res;
4907         struct rpc_message msg = {
4908                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
4909                 .rpc_cred = cred,
4910         };
4911
4912         args = kzalloc(sizeof(*args), GFP_KERNEL);
4913         if (!args)
4914                 return -ENOMEM;
4915         res = kzalloc(sizeof(*res), GFP_KERNEL);
4916         if (!res) {
4917                 kfree(args);
4918                 return -ENOMEM;
4919         }
4920         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
4921         msg.rpc_argp = args;
4922         msg.rpc_resp = res;
4923
4924         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
4925                               &nfs41_sequence_ops, (void *)clp);
4926 }
4927
4928 struct nfs4_reclaim_complete_data {
4929         struct nfs_client *clp;
4930         struct nfs41_reclaim_complete_args arg;
4931         struct nfs41_reclaim_complete_res res;
4932 };
4933
4934 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
4935 {
4936         struct nfs4_reclaim_complete_data *calldata = data;
4937
4938         if (nfs4_setup_sequence(calldata->clp, &calldata->arg.seq_args,
4939                                 &calldata->res.seq_res, 0, task))
4940                 return;
4941
4942         rpc_call_start(task);
4943 }
4944
4945 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
4946 {
4947         struct nfs4_reclaim_complete_data *calldata = data;
4948         struct nfs_client *clp = calldata->clp;
4949         struct nfs4_sequence_res *res = &calldata->res.seq_res;
4950
4951         dprintk("--> %s\n", __func__);
4952         nfs41_sequence_done(clp, res, task->tk_status);
4953         switch (task->tk_status) {
4954         case 0:
4955         case -NFS4ERR_COMPLETE_ALREADY:
4956                 break;
4957         case -NFS4ERR_BADSESSION:
4958         case -NFS4ERR_DEADSESSION:
4959                 /*
4960                  * Handle the session error, but do not retry the operation, as
4961                  * we have no way of telling whether the clientid had to be
4962                  * reset before we got our reply.  If reset, a new wave of
4963                  * reclaim operations will follow, containing their own reclaim
4964                  * complete.  We don't want our retry to get on the way of
4965                  * recovery by incorrectly indicating to the server that we're
4966                  * done reclaiming state since the process had to be restarted.
4967                  */
4968                 _nfs4_async_handle_error(task, NULL, clp, NULL);
4969                 break;
4970         default:
4971                 if (_nfs4_async_handle_error(
4972                                 task, NULL, clp, NULL) == -EAGAIN) {
4973                         rpc_restart_call_prepare(task);
4974                         return;
4975                 }
4976         }
4977
4978         dprintk("<-- %s\n", __func__);
4979 }
4980
4981 static void nfs4_free_reclaim_complete_data(void *data)
4982 {
4983         struct nfs4_reclaim_complete_data *calldata = data;
4984
4985         kfree(calldata);
4986 }
4987
4988 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
4989         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
4990         .rpc_call_done = nfs4_reclaim_complete_done,
4991         .rpc_release = nfs4_free_reclaim_complete_data,
4992 };
4993
4994 /*
4995  * Issue a global reclaim complete.
4996  */
4997 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
4998 {
4999         struct nfs4_reclaim_complete_data *calldata;
5000         struct rpc_task *task;
5001         struct rpc_message msg = {
5002                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5003         };
5004         struct rpc_task_setup task_setup_data = {
5005                 .rpc_client = clp->cl_rpcclient,
5006                 .rpc_message = &msg,
5007                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5008                 .flags = RPC_TASK_ASYNC,
5009         };
5010         int status = -ENOMEM;
5011
5012         dprintk("--> %s\n", __func__);
5013         calldata = kzalloc(sizeof(*calldata), GFP_KERNEL);
5014         if (calldata == NULL)
5015                 goto out;
5016         calldata->clp = clp;
5017         calldata->arg.one_fs = 0;
5018         calldata->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
5019
5020         msg.rpc_argp = &calldata->arg;
5021         msg.rpc_resp = &calldata->res;
5022         task_setup_data.callback_data = calldata;
5023         task = rpc_run_task(&task_setup_data);
5024         if (IS_ERR(task))
5025                 status = PTR_ERR(task);
5026         rpc_put_task(task);
5027 out:
5028         dprintk("<-- %s status=%d\n", __func__, status);
5029         return status;
5030 }
5031 #endif /* CONFIG_NFS_V4_1 */
5032
5033 struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
5034         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5035         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5036         .recover_open   = nfs4_open_reclaim,
5037         .recover_lock   = nfs4_lock_reclaim,
5038         .establish_clid = nfs4_init_clientid,
5039         .get_clid_cred  = nfs4_get_setclientid_cred,
5040 };
5041
5042 #if defined(CONFIG_NFS_V4_1)
5043 struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
5044         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5045         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5046         .recover_open   = nfs4_open_reclaim,
5047         .recover_lock   = nfs4_lock_reclaim,
5048         .establish_clid = nfs41_init_clientid,
5049         .get_clid_cred  = nfs4_get_exchange_id_cred,
5050         .reclaim_complete = nfs41_proc_reclaim_complete,
5051 };
5052 #endif /* CONFIG_NFS_V4_1 */
5053
5054 struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
5055         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5056         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5057         .recover_open   = nfs4_open_expired,
5058         .recover_lock   = nfs4_lock_expired,
5059         .establish_clid = nfs4_init_clientid,
5060         .get_clid_cred  = nfs4_get_setclientid_cred,
5061 };
5062
5063 #if defined(CONFIG_NFS_V4_1)
5064 struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
5065         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5066         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5067         .recover_open   = nfs4_open_expired,
5068         .recover_lock   = nfs4_lock_expired,
5069         .establish_clid = nfs41_init_clientid,
5070         .get_clid_cred  = nfs4_get_exchange_id_cred,
5071 };
5072 #endif /* CONFIG_NFS_V4_1 */
5073
5074 struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
5075         .sched_state_renewal = nfs4_proc_async_renew,
5076         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
5077         .renew_lease = nfs4_proc_renew,
5078 };
5079
5080 #if defined(CONFIG_NFS_V4_1)
5081 struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
5082         .sched_state_renewal = nfs41_proc_async_sequence,
5083         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
5084         .renew_lease = nfs4_proc_sequence,
5085 };
5086 #endif
5087
5088 /*
5089  * Per minor version reboot and network partition recovery ops
5090  */
5091
5092 struct nfs4_state_recovery_ops *nfs4_reboot_recovery_ops[] = {
5093         &nfs40_reboot_recovery_ops,
5094 #if defined(CONFIG_NFS_V4_1)
5095         &nfs41_reboot_recovery_ops,
5096 #endif
5097 };
5098
5099 struct nfs4_state_recovery_ops *nfs4_nograce_recovery_ops[] = {
5100         &nfs40_nograce_recovery_ops,
5101 #if defined(CONFIG_NFS_V4_1)
5102         &nfs41_nograce_recovery_ops,
5103 #endif
5104 };
5105
5106 struct nfs4_state_maintenance_ops *nfs4_state_renewal_ops[] = {
5107         &nfs40_state_renewal_ops,
5108 #if defined(CONFIG_NFS_V4_1)
5109         &nfs41_state_renewal_ops,
5110 #endif
5111 };
5112
5113 static const struct inode_operations nfs4_file_inode_operations = {
5114         .permission     = nfs_permission,
5115         .getattr        = nfs_getattr,
5116         .setattr        = nfs_setattr,
5117         .getxattr       = nfs4_getxattr,
5118         .setxattr       = nfs4_setxattr,
5119         .listxattr      = nfs4_listxattr,
5120 };
5121
5122 const struct nfs_rpc_ops nfs_v4_clientops = {
5123         .version        = 4,                    /* protocol version */
5124         .dentry_ops     = &nfs4_dentry_operations,
5125         .dir_inode_ops  = &nfs4_dir_inode_operations,
5126         .file_inode_ops = &nfs4_file_inode_operations,
5127         .getroot        = nfs4_proc_get_root,
5128         .getattr        = nfs4_proc_getattr,
5129         .setattr        = nfs4_proc_setattr,
5130         .lookupfh       = nfs4_proc_lookupfh,
5131         .lookup         = nfs4_proc_lookup,
5132         .access         = nfs4_proc_access,
5133         .readlink       = nfs4_proc_readlink,
5134         .create         = nfs4_proc_create,
5135         .remove         = nfs4_proc_remove,
5136         .unlink_setup   = nfs4_proc_unlink_setup,
5137         .unlink_done    = nfs4_proc_unlink_done,
5138         .rename         = nfs4_proc_rename,
5139         .link           = nfs4_proc_link,
5140         .symlink        = nfs4_proc_symlink,
5141         .mkdir          = nfs4_proc_mkdir,
5142         .rmdir          = nfs4_proc_remove,
5143         .readdir        = nfs4_proc_readdir,
5144         .mknod          = nfs4_proc_mknod,
5145         .statfs         = nfs4_proc_statfs,
5146         .fsinfo         = nfs4_proc_fsinfo,
5147         .pathconf       = nfs4_proc_pathconf,
5148         .set_capabilities = nfs4_server_capabilities,
5149         .decode_dirent  = nfs4_decode_dirent,
5150         .read_setup     = nfs4_proc_read_setup,
5151         .read_done      = nfs4_read_done,
5152         .write_setup    = nfs4_proc_write_setup,
5153         .write_done     = nfs4_write_done,
5154         .commit_setup   = nfs4_proc_commit_setup,
5155         .commit_done    = nfs4_commit_done,
5156         .lock           = nfs4_proc_lock,
5157         .clear_acl_cache = nfs4_zap_acl_attr,
5158         .close_context  = nfs4_close_context,
5159 };
5160
5161 /*
5162  * Local variables:
5163  *  c-basic-offset: 8
5164  * End:
5165  */