Merge branch 'master' into devel
[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                         set_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state);
274                         exception->retry = 1;
275                         /* FALLTHROUGH */
276 #endif /* !defined(CONFIG_NFS_V4_1) */
277                 case -NFS4ERR_FILE_OPEN:
278                 case -NFS4ERR_GRACE:
279                 case -NFS4ERR_DELAY:
280                         ret = nfs4_delay(server->client, &exception->timeout);
281                         if (ret != 0)
282                                 break;
283                 case -NFS4ERR_OLD_STATEID:
284                         exception->retry = 1;
285         }
286         /* We failed to handle the error */
287         return nfs4_map_errors(ret);
288 }
289
290
291 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
292 {
293         struct nfs_client *clp = server->nfs_client;
294         spin_lock(&clp->cl_lock);
295         if (time_before(clp->cl_last_renewal,timestamp))
296                 clp->cl_last_renewal = timestamp;
297         spin_unlock(&clp->cl_lock);
298 }
299
300 #if defined(CONFIG_NFS_V4_1)
301
302 /*
303  * nfs4_free_slot - free a slot and efficiently update slot table.
304  *
305  * freeing a slot is trivially done by clearing its respective bit
306  * in the bitmap.
307  * If the freed slotid equals highest_used_slotid we want to update it
308  * so that the server would be able to size down the slot table if needed,
309  * otherwise we know that the highest_used_slotid is still in use.
310  * When updating highest_used_slotid there may be "holes" in the bitmap
311  * so we need to scan down from highest_used_slotid to 0 looking for the now
312  * highest slotid in use.
313  * If none found, highest_used_slotid is set to -1.
314  */
315 static void
316 nfs4_free_slot(struct nfs4_slot_table *tbl, u8 free_slotid)
317 {
318         int slotid = free_slotid;
319
320         spin_lock(&tbl->slot_tbl_lock);
321         /* clear used bit in bitmap */
322         __clear_bit(slotid, tbl->used_slots);
323
324         /* update highest_used_slotid when it is freed */
325         if (slotid == tbl->highest_used_slotid) {
326                 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
327                 if (slotid >= 0 && slotid < tbl->max_slots)
328                         tbl->highest_used_slotid = slotid;
329                 else
330                         tbl->highest_used_slotid = -1;
331         }
332         rpc_wake_up_next(&tbl->slot_tbl_waitq);
333         spin_unlock(&tbl->slot_tbl_lock);
334         dprintk("%s: free_slotid %u highest_used_slotid %d\n", __func__,
335                 free_slotid, tbl->highest_used_slotid);
336 }
337
338 void nfs41_sequence_free_slot(const struct nfs_client *clp,
339                               struct nfs4_sequence_res *res)
340 {
341         struct nfs4_slot_table *tbl;
342
343         if (!nfs4_has_session(clp)) {
344                 dprintk("%s: No session\n", __func__);
345                 return;
346         }
347         tbl = &clp->cl_session->fc_slot_table;
348         if (res->sr_slotid == NFS4_MAX_SLOT_TABLE) {
349                 dprintk("%s: No slot\n", __func__);
350                 /* just wake up the next guy waiting since
351                  * we may have not consumed a slot after all */
352                 rpc_wake_up_next(&tbl->slot_tbl_waitq);
353                 return;
354         }
355         nfs4_free_slot(tbl, res->sr_slotid);
356         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
357 }
358
359 static void nfs41_sequence_done(struct nfs_client *clp,
360                                 struct nfs4_sequence_res *res,
361                                 int rpc_status)
362 {
363         unsigned long timestamp;
364         struct nfs4_slot_table *tbl;
365         struct nfs4_slot *slot;
366
367         /*
368          * sr_status remains 1 if an RPC level error occurred. The server
369          * may or may not have processed the sequence operation..
370          * Proceed as if the server received and processed the sequence
371          * operation.
372          */
373         if (res->sr_status == 1)
374                 res->sr_status = NFS_OK;
375
376         /* -ERESTARTSYS can result in skipping nfs41_sequence_setup */
377         if (res->sr_slotid == NFS4_MAX_SLOT_TABLE)
378                 goto out;
379
380         tbl = &clp->cl_session->fc_slot_table;
381         slot = tbl->slots + res->sr_slotid;
382
383         if (res->sr_status == 0) {
384                 /* Update the slot's sequence and clientid lease timer */
385                 ++slot->seq_nr;
386                 timestamp = res->sr_renewal_time;
387                 spin_lock(&clp->cl_lock);
388                 if (time_before(clp->cl_last_renewal, timestamp))
389                         clp->cl_last_renewal = timestamp;
390                 spin_unlock(&clp->cl_lock);
391                 return;
392         }
393 out:
394         /* The session may be reset by one of the error handlers. */
395         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
396         nfs41_sequence_free_slot(clp, res);
397 }
398
399 /*
400  * nfs4_find_slot - efficiently look for a free slot
401  *
402  * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
403  * If found, we mark the slot as used, update the highest_used_slotid,
404  * and respectively set up the sequence operation args.
405  * The slot number is returned if found, or NFS4_MAX_SLOT_TABLE otherwise.
406  *
407  * Note: must be called with under the slot_tbl_lock.
408  */
409 static u8
410 nfs4_find_slot(struct nfs4_slot_table *tbl, struct rpc_task *task)
411 {
412         int slotid;
413         u8 ret_id = NFS4_MAX_SLOT_TABLE;
414         BUILD_BUG_ON((u8)NFS4_MAX_SLOT_TABLE != (int)NFS4_MAX_SLOT_TABLE);
415
416         dprintk("--> %s used_slots=%04lx highest_used=%d max_slots=%d\n",
417                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
418                 tbl->max_slots);
419         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
420         if (slotid >= tbl->max_slots)
421                 goto out;
422         __set_bit(slotid, tbl->used_slots);
423         if (slotid > tbl->highest_used_slotid)
424                 tbl->highest_used_slotid = slotid;
425         ret_id = slotid;
426 out:
427         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
428                 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
429         return ret_id;
430 }
431
432 static int nfs4_recover_session(struct nfs4_session *session)
433 {
434         struct nfs_client *clp = session->clp;
435         unsigned int loop;
436         int ret;
437
438         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
439                 ret = nfs4_wait_clnt_recover(clp);
440                 if (ret != 0)
441                         break;
442                 if (!test_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state))
443                         break;
444                 nfs4_schedule_state_manager(clp);
445                 ret = -EIO;
446         }
447         return ret;
448 }
449
450 static int nfs41_setup_sequence(struct nfs4_session *session,
451                                 struct nfs4_sequence_args *args,
452                                 struct nfs4_sequence_res *res,
453                                 int cache_reply,
454                                 struct rpc_task *task)
455 {
456         struct nfs4_slot *slot;
457         struct nfs4_slot_table *tbl;
458         int status = 0;
459         u8 slotid;
460
461         dprintk("--> %s\n", __func__);
462         /* slot already allocated? */
463         if (res->sr_slotid != NFS4_MAX_SLOT_TABLE)
464                 return 0;
465
466         memset(res, 0, sizeof(*res));
467         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
468         tbl = &session->fc_slot_table;
469
470         spin_lock(&tbl->slot_tbl_lock);
471         if (test_bit(NFS4CLNT_SESSION_SETUP, &session->clp->cl_state)) {
472                 if (tbl->highest_used_slotid != -1) {
473                         rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
474                         spin_unlock(&tbl->slot_tbl_lock);
475                         dprintk("<-- %s: Session reset: draining\n", __func__);
476                         return -EAGAIN;
477                 }
478
479                 /* The slot table is empty; start the reset thread */
480                 dprintk("%s Session Reset\n", __func__);
481                 spin_unlock(&tbl->slot_tbl_lock);
482                 status = nfs4_recover_session(session);
483                 if (status)
484                         return status;
485                 spin_lock(&tbl->slot_tbl_lock);
486         }
487
488         slotid = nfs4_find_slot(tbl, task);
489         if (slotid == NFS4_MAX_SLOT_TABLE) {
490                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
491                 spin_unlock(&tbl->slot_tbl_lock);
492                 dprintk("<-- %s: no free slots\n", __func__);
493                 return -EAGAIN;
494         }
495         spin_unlock(&tbl->slot_tbl_lock);
496
497         slot = tbl->slots + slotid;
498         args->sa_session = session;
499         args->sa_slotid = slotid;
500         args->sa_cache_this = cache_reply;
501
502         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
503
504         res->sr_session = session;
505         res->sr_slotid = slotid;
506         res->sr_renewal_time = jiffies;
507         /*
508          * sr_status is only set in decode_sequence, and so will remain
509          * set to 1 if an rpc level failure occurs.
510          */
511         res->sr_status = 1;
512         return 0;
513 }
514
515 int nfs4_setup_sequence(struct nfs_client *clp,
516                         struct nfs4_sequence_args *args,
517                         struct nfs4_sequence_res *res,
518                         int cache_reply,
519                         struct rpc_task *task)
520 {
521         int ret = 0;
522
523         dprintk("--> %s clp %p session %p sr_slotid %d\n",
524                 __func__, clp, clp->cl_session, res->sr_slotid);
525
526         if (!nfs4_has_session(clp))
527                 goto out;
528         ret = nfs41_setup_sequence(clp->cl_session, args, res, cache_reply,
529                                    task);
530         if (ret != -EAGAIN) {
531                 /* terminate rpc task */
532                 task->tk_status = ret;
533                 task->tk_action = NULL;
534         }
535 out:
536         dprintk("<-- %s status=%d\n", __func__, ret);
537         return ret;
538 }
539
540 struct nfs41_call_sync_data {
541         struct nfs_client *clp;
542         struct nfs4_sequence_args *seq_args;
543         struct nfs4_sequence_res *seq_res;
544         int cache_reply;
545 };
546
547 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
548 {
549         struct nfs41_call_sync_data *data = calldata;
550
551         dprintk("--> %s data->clp->cl_session %p\n", __func__,
552                 data->clp->cl_session);
553         if (nfs4_setup_sequence(data->clp, data->seq_args,
554                                 data->seq_res, data->cache_reply, task))
555                 return;
556         rpc_call_start(task);
557 }
558
559 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
560 {
561         struct nfs41_call_sync_data *data = calldata;
562
563         nfs41_sequence_done(data->clp, data->seq_res, task->tk_status);
564         nfs41_sequence_free_slot(data->clp, data->seq_res);
565 }
566
567 struct rpc_call_ops nfs41_call_sync_ops = {
568         .rpc_call_prepare = nfs41_call_sync_prepare,
569         .rpc_call_done = nfs41_call_sync_done,
570 };
571
572 static int nfs4_call_sync_sequence(struct nfs_client *clp,
573                                    struct rpc_clnt *clnt,
574                                    struct rpc_message *msg,
575                                    struct nfs4_sequence_args *args,
576                                    struct nfs4_sequence_res *res,
577                                    int cache_reply)
578 {
579         int ret;
580         struct rpc_task *task;
581         struct nfs41_call_sync_data data = {
582                 .clp = clp,
583                 .seq_args = args,
584                 .seq_res = res,
585                 .cache_reply = cache_reply,
586         };
587         struct rpc_task_setup task_setup = {
588                 .rpc_client = clnt,
589                 .rpc_message = msg,
590                 .callback_ops = &nfs41_call_sync_ops,
591                 .callback_data = &data
592         };
593
594         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
595         task = rpc_run_task(&task_setup);
596         if (IS_ERR(task))
597                 ret = PTR_ERR(task);
598         else {
599                 ret = task->tk_status;
600                 rpc_put_task(task);
601         }
602         return ret;
603 }
604
605 int _nfs4_call_sync_session(struct nfs_server *server,
606                             struct rpc_message *msg,
607                             struct nfs4_sequence_args *args,
608                             struct nfs4_sequence_res *res,
609                             int cache_reply)
610 {
611         return nfs4_call_sync_sequence(server->nfs_client, server->client,
612                                        msg, args, res, cache_reply);
613 }
614
615 #endif /* CONFIG_NFS_V4_1 */
616
617 int _nfs4_call_sync(struct nfs_server *server,
618                     struct rpc_message *msg,
619                     struct nfs4_sequence_args *args,
620                     struct nfs4_sequence_res *res,
621                     int cache_reply)
622 {
623         args->sa_session = res->sr_session = NULL;
624         return rpc_call_sync(server->client, msg, 0);
625 }
626
627 #define nfs4_call_sync(server, msg, args, res, cache_reply) \
628         (server)->nfs_client->cl_call_sync((server), (msg), &(args)->seq_args, \
629                         &(res)->seq_res, (cache_reply))
630
631 static void nfs4_sequence_done(const struct nfs_server *server,
632                                struct nfs4_sequence_res *res, int rpc_status)
633 {
634 #ifdef CONFIG_NFS_V4_1
635         if (nfs4_has_session(server->nfs_client))
636                 nfs41_sequence_done(server->nfs_client, res, rpc_status);
637 #endif /* CONFIG_NFS_V4_1 */
638 }
639
640 /* no restart, therefore free slot here */
641 static void nfs4_sequence_done_free_slot(const struct nfs_server *server,
642                                          struct nfs4_sequence_res *res,
643                                          int rpc_status)
644 {
645         nfs4_sequence_done(server, res, rpc_status);
646         nfs4_sequence_free_slot(server->nfs_client, res);
647 }
648
649 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
650 {
651         struct nfs_inode *nfsi = NFS_I(dir);
652
653         spin_lock(&dir->i_lock);
654         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
655         if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
656                 nfs_force_lookup_revalidate(dir);
657         nfsi->change_attr = cinfo->after;
658         spin_unlock(&dir->i_lock);
659 }
660
661 struct nfs4_opendata {
662         struct kref kref;
663         struct nfs_openargs o_arg;
664         struct nfs_openres o_res;
665         struct nfs_open_confirmargs c_arg;
666         struct nfs_open_confirmres c_res;
667         struct nfs_fattr f_attr;
668         struct nfs_fattr dir_attr;
669         struct path path;
670         struct dentry *dir;
671         struct nfs4_state_owner *owner;
672         struct nfs4_state *state;
673         struct iattr attrs;
674         unsigned long timestamp;
675         unsigned int rpc_done : 1;
676         int rpc_status;
677         int cancelled;
678 };
679
680
681 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
682 {
683         p->o_res.f_attr = &p->f_attr;
684         p->o_res.dir_attr = &p->dir_attr;
685         p->o_res.seqid = p->o_arg.seqid;
686         p->c_res.seqid = p->c_arg.seqid;
687         p->o_res.server = p->o_arg.server;
688         nfs_fattr_init(&p->f_attr);
689         nfs_fattr_init(&p->dir_attr);
690         p->o_res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
691 }
692
693 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
694                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
695                 const struct iattr *attrs)
696 {
697         struct dentry *parent = dget_parent(path->dentry);
698         struct inode *dir = parent->d_inode;
699         struct nfs_server *server = NFS_SERVER(dir);
700         struct nfs4_opendata *p;
701
702         p = kzalloc(sizeof(*p), GFP_KERNEL);
703         if (p == NULL)
704                 goto err;
705         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
706         if (p->o_arg.seqid == NULL)
707                 goto err_free;
708         p->path.mnt = mntget(path->mnt);
709         p->path.dentry = dget(path->dentry);
710         p->dir = parent;
711         p->owner = sp;
712         atomic_inc(&sp->so_count);
713         p->o_arg.fh = NFS_FH(dir);
714         p->o_arg.open_flags = flags;
715         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
716         p->o_arg.clientid = server->nfs_client->cl_clientid;
717         p->o_arg.id = sp->so_owner_id.id;
718         p->o_arg.name = &p->path.dentry->d_name;
719         p->o_arg.server = server;
720         p->o_arg.bitmask = server->attr_bitmask;
721         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
722         if (flags & O_EXCL) {
723                 u32 *s = (u32 *) p->o_arg.u.verifier.data;
724                 s[0] = jiffies;
725                 s[1] = current->pid;
726         } else if (flags & O_CREAT) {
727                 p->o_arg.u.attrs = &p->attrs;
728                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
729         }
730         p->c_arg.fh = &p->o_res.fh;
731         p->c_arg.stateid = &p->o_res.stateid;
732         p->c_arg.seqid = p->o_arg.seqid;
733         nfs4_init_opendata_res(p);
734         kref_init(&p->kref);
735         return p;
736 err_free:
737         kfree(p);
738 err:
739         dput(parent);
740         return NULL;
741 }
742
743 static void nfs4_opendata_free(struct kref *kref)
744 {
745         struct nfs4_opendata *p = container_of(kref,
746                         struct nfs4_opendata, kref);
747
748         nfs_free_seqid(p->o_arg.seqid);
749         if (p->state != NULL)
750                 nfs4_put_open_state(p->state);
751         nfs4_put_state_owner(p->owner);
752         dput(p->dir);
753         path_put(&p->path);
754         kfree(p);
755 }
756
757 static void nfs4_opendata_put(struct nfs4_opendata *p)
758 {
759         if (p != NULL)
760                 kref_put(&p->kref, nfs4_opendata_free);
761 }
762
763 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
764 {
765         int ret;
766
767         ret = rpc_wait_for_completion_task(task);
768         return ret;
769 }
770
771 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
772 {
773         int ret = 0;
774
775         if (open_mode & O_EXCL)
776                 goto out;
777         switch (mode & (FMODE_READ|FMODE_WRITE)) {
778                 case FMODE_READ:
779                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0;
780                         break;
781                 case FMODE_WRITE:
782                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0;
783                         break;
784                 case FMODE_READ|FMODE_WRITE:
785                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0;
786         }
787 out:
788         return ret;
789 }
790
791 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
792 {
793         if ((delegation->type & fmode) != fmode)
794                 return 0;
795         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
796                 return 0;
797         nfs_mark_delegation_referenced(delegation);
798         return 1;
799 }
800
801 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
802 {
803         switch (fmode) {
804                 case FMODE_WRITE:
805                         state->n_wronly++;
806                         break;
807                 case FMODE_READ:
808                         state->n_rdonly++;
809                         break;
810                 case FMODE_READ|FMODE_WRITE:
811                         state->n_rdwr++;
812         }
813         nfs4_state_set_mode_locked(state, state->state | fmode);
814 }
815
816 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
817 {
818         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
819                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
820         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
821         switch (fmode) {
822                 case FMODE_READ:
823                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
824                         break;
825                 case FMODE_WRITE:
826                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
827                         break;
828                 case FMODE_READ|FMODE_WRITE:
829                         set_bit(NFS_O_RDWR_STATE, &state->flags);
830         }
831 }
832
833 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
834 {
835         write_seqlock(&state->seqlock);
836         nfs_set_open_stateid_locked(state, stateid, fmode);
837         write_sequnlock(&state->seqlock);
838 }
839
840 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
841 {
842         /*
843          * Protect the call to nfs4_state_set_mode_locked and
844          * serialise the stateid update
845          */
846         write_seqlock(&state->seqlock);
847         if (deleg_stateid != NULL) {
848                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
849                 set_bit(NFS_DELEGATED_STATE, &state->flags);
850         }
851         if (open_stateid != NULL)
852                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
853         write_sequnlock(&state->seqlock);
854         spin_lock(&state->owner->so_lock);
855         update_open_stateflags(state, fmode);
856         spin_unlock(&state->owner->so_lock);
857 }
858
859 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
860 {
861         struct nfs_inode *nfsi = NFS_I(state->inode);
862         struct nfs_delegation *deleg_cur;
863         int ret = 0;
864
865         fmode &= (FMODE_READ|FMODE_WRITE);
866
867         rcu_read_lock();
868         deleg_cur = rcu_dereference(nfsi->delegation);
869         if (deleg_cur == NULL)
870                 goto no_delegation;
871
872         spin_lock(&deleg_cur->lock);
873         if (nfsi->delegation != deleg_cur ||
874             (deleg_cur->type & fmode) != fmode)
875                 goto no_delegation_unlock;
876
877         if (delegation == NULL)
878                 delegation = &deleg_cur->stateid;
879         else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
880                 goto no_delegation_unlock;
881
882         nfs_mark_delegation_referenced(deleg_cur);
883         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
884         ret = 1;
885 no_delegation_unlock:
886         spin_unlock(&deleg_cur->lock);
887 no_delegation:
888         rcu_read_unlock();
889
890         if (!ret && open_stateid != NULL) {
891                 __update_open_stateid(state, open_stateid, NULL, fmode);
892                 ret = 1;
893         }
894
895         return ret;
896 }
897
898
899 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
900 {
901         struct nfs_delegation *delegation;
902
903         rcu_read_lock();
904         delegation = rcu_dereference(NFS_I(inode)->delegation);
905         if (delegation == NULL || (delegation->type & fmode) == fmode) {
906                 rcu_read_unlock();
907                 return;
908         }
909         rcu_read_unlock();
910         nfs_inode_return_delegation(inode);
911 }
912
913 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
914 {
915         struct nfs4_state *state = opendata->state;
916         struct nfs_inode *nfsi = NFS_I(state->inode);
917         struct nfs_delegation *delegation;
918         int open_mode = opendata->o_arg.open_flags & O_EXCL;
919         fmode_t fmode = opendata->o_arg.fmode;
920         nfs4_stateid stateid;
921         int ret = -EAGAIN;
922
923         for (;;) {
924                 if (can_open_cached(state, fmode, open_mode)) {
925                         spin_lock(&state->owner->so_lock);
926                         if (can_open_cached(state, fmode, open_mode)) {
927                                 update_open_stateflags(state, fmode);
928                                 spin_unlock(&state->owner->so_lock);
929                                 goto out_return_state;
930                         }
931                         spin_unlock(&state->owner->so_lock);
932                 }
933                 rcu_read_lock();
934                 delegation = rcu_dereference(nfsi->delegation);
935                 if (delegation == NULL ||
936                     !can_open_delegated(delegation, fmode)) {
937                         rcu_read_unlock();
938                         break;
939                 }
940                 /* Save the delegation */
941                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
942                 rcu_read_unlock();
943                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
944                 if (ret != 0)
945                         goto out;
946                 ret = -EAGAIN;
947
948                 /* Try to update the stateid using the delegation */
949                 if (update_open_stateid(state, NULL, &stateid, fmode))
950                         goto out_return_state;
951         }
952 out:
953         return ERR_PTR(ret);
954 out_return_state:
955         atomic_inc(&state->count);
956         return state;
957 }
958
959 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
960 {
961         struct inode *inode;
962         struct nfs4_state *state = NULL;
963         struct nfs_delegation *delegation;
964         int ret;
965
966         if (!data->rpc_done) {
967                 state = nfs4_try_open_cached(data);
968                 goto out;
969         }
970
971         ret = -EAGAIN;
972         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
973                 goto err;
974         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
975         ret = PTR_ERR(inode);
976         if (IS_ERR(inode))
977                 goto err;
978         ret = -ENOMEM;
979         state = nfs4_get_open_state(inode, data->owner);
980         if (state == NULL)
981                 goto err_put_inode;
982         if (data->o_res.delegation_type != 0) {
983                 int delegation_flags = 0;
984
985                 rcu_read_lock();
986                 delegation = rcu_dereference(NFS_I(inode)->delegation);
987                 if (delegation)
988                         delegation_flags = delegation->flags;
989                 rcu_read_unlock();
990                 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
991                         nfs_inode_set_delegation(state->inode,
992                                         data->owner->so_cred,
993                                         &data->o_res);
994                 else
995                         nfs_inode_reclaim_delegation(state->inode,
996                                         data->owner->so_cred,
997                                         &data->o_res);
998         }
999
1000         update_open_stateid(state, &data->o_res.stateid, NULL,
1001                         data->o_arg.fmode);
1002         iput(inode);
1003 out:
1004         return state;
1005 err_put_inode:
1006         iput(inode);
1007 err:
1008         return ERR_PTR(ret);
1009 }
1010
1011 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1012 {
1013         struct nfs_inode *nfsi = NFS_I(state->inode);
1014         struct nfs_open_context *ctx;
1015
1016         spin_lock(&state->inode->i_lock);
1017         list_for_each_entry(ctx, &nfsi->open_files, list) {
1018                 if (ctx->state != state)
1019                         continue;
1020                 get_nfs_open_context(ctx);
1021                 spin_unlock(&state->inode->i_lock);
1022                 return ctx;
1023         }
1024         spin_unlock(&state->inode->i_lock);
1025         return ERR_PTR(-ENOENT);
1026 }
1027
1028 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1029 {
1030         struct nfs4_opendata *opendata;
1031
1032         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, 0, NULL);
1033         if (opendata == NULL)
1034                 return ERR_PTR(-ENOMEM);
1035         opendata->state = state;
1036         atomic_inc(&state->count);
1037         return opendata;
1038 }
1039
1040 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1041 {
1042         struct nfs4_state *newstate;
1043         int ret;
1044
1045         opendata->o_arg.open_flags = 0;
1046         opendata->o_arg.fmode = fmode;
1047         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1048         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1049         nfs4_init_opendata_res(opendata);
1050         ret = _nfs4_proc_open(opendata);
1051         if (ret != 0)
1052                 return ret; 
1053         newstate = nfs4_opendata_to_nfs4_state(opendata);
1054         if (IS_ERR(newstate))
1055                 return PTR_ERR(newstate);
1056         nfs4_close_state(&opendata->path, newstate, fmode);
1057         *res = newstate;
1058         return 0;
1059 }
1060
1061 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1062 {
1063         struct nfs4_state *newstate;
1064         int ret;
1065
1066         /* memory barrier prior to reading state->n_* */
1067         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1068         smp_rmb();
1069         if (state->n_rdwr != 0) {
1070                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1071                 if (ret != 0)
1072                         return ret;
1073                 if (newstate != state)
1074                         return -ESTALE;
1075         }
1076         if (state->n_wronly != 0) {
1077                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1078                 if (ret != 0)
1079                         return ret;
1080                 if (newstate != state)
1081                         return -ESTALE;
1082         }
1083         if (state->n_rdonly != 0) {
1084                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1085                 if (ret != 0)
1086                         return ret;
1087                 if (newstate != state)
1088                         return -ESTALE;
1089         }
1090         /*
1091          * We may have performed cached opens for all three recoveries.
1092          * Check if we need to update the current stateid.
1093          */
1094         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1095             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
1096                 write_seqlock(&state->seqlock);
1097                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1098                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
1099                 write_sequnlock(&state->seqlock);
1100         }
1101         return 0;
1102 }
1103
1104 /*
1105  * OPEN_RECLAIM:
1106  *      reclaim state on the server after a reboot.
1107  */
1108 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1109 {
1110         struct nfs_delegation *delegation;
1111         struct nfs4_opendata *opendata;
1112         fmode_t delegation_type = 0;
1113         int status;
1114
1115         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1116         if (IS_ERR(opendata))
1117                 return PTR_ERR(opendata);
1118         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1119         opendata->o_arg.fh = NFS_FH(state->inode);
1120         rcu_read_lock();
1121         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1122         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1123                 delegation_type = delegation->type;
1124         rcu_read_unlock();
1125         opendata->o_arg.u.delegation_type = delegation_type;
1126         status = nfs4_open_recover(opendata, state);
1127         nfs4_opendata_put(opendata);
1128         return status;
1129 }
1130
1131 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1132 {
1133         struct nfs_server *server = NFS_SERVER(state->inode);
1134         struct nfs4_exception exception = { };
1135         int err;
1136         do {
1137                 err = _nfs4_do_open_reclaim(ctx, state);
1138                 if (err != -NFS4ERR_DELAY)
1139                         break;
1140                 nfs4_handle_exception(server, err, &exception);
1141         } while (exception.retry);
1142         return err;
1143 }
1144
1145 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1146 {
1147         struct nfs_open_context *ctx;
1148         int ret;
1149
1150         ctx = nfs4_state_find_open_context(state);
1151         if (IS_ERR(ctx))
1152                 return PTR_ERR(ctx);
1153         ret = nfs4_do_open_reclaim(ctx, state);
1154         put_nfs_open_context(ctx);
1155         return ret;
1156 }
1157
1158 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1159 {
1160         struct nfs4_opendata *opendata;
1161         int ret;
1162
1163         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1164         if (IS_ERR(opendata))
1165                 return PTR_ERR(opendata);
1166         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1167         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
1168                         sizeof(opendata->o_arg.u.delegation.data));
1169         ret = nfs4_open_recover(opendata, state);
1170         nfs4_opendata_put(opendata);
1171         return ret;
1172 }
1173
1174 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1175 {
1176         struct nfs4_exception exception = { };
1177         struct nfs_server *server = NFS_SERVER(state->inode);
1178         int err;
1179         do {
1180                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1181                 switch (err) {
1182                         case 0:
1183                         case -ENOENT:
1184                         case -ESTALE:
1185                                 goto out;
1186                         case -NFS4ERR_STALE_CLIENTID:
1187                         case -NFS4ERR_STALE_STATEID:
1188                         case -NFS4ERR_EXPIRED:
1189                                 /* Don't recall a delegation if it was lost */
1190                                 nfs4_schedule_state_recovery(server->nfs_client);
1191                                 goto out;
1192                         case -ERESTARTSYS:
1193                                 /*
1194                                  * The show must go on: exit, but mark the
1195                                  * stateid as needing recovery.
1196                                  */
1197                         case -NFS4ERR_ADMIN_REVOKED:
1198                         case -NFS4ERR_BAD_STATEID:
1199                                 nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
1200                         case -ENOMEM:
1201                                 err = 0;
1202                                 goto out;
1203                 }
1204                 err = nfs4_handle_exception(server, err, &exception);
1205         } while (exception.retry);
1206 out:
1207         return err;
1208 }
1209
1210 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1211 {
1212         struct nfs4_opendata *data = calldata;
1213
1214         data->rpc_status = task->tk_status;
1215         if (RPC_ASSASSINATED(task))
1216                 return;
1217         if (data->rpc_status == 0) {
1218                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
1219                                 sizeof(data->o_res.stateid.data));
1220                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1221                 renew_lease(data->o_res.server, data->timestamp);
1222                 data->rpc_done = 1;
1223         }
1224 }
1225
1226 static void nfs4_open_confirm_release(void *calldata)
1227 {
1228         struct nfs4_opendata *data = calldata;
1229         struct nfs4_state *state = NULL;
1230
1231         /* If this request hasn't been cancelled, do nothing */
1232         if (data->cancelled == 0)
1233                 goto out_free;
1234         /* In case of error, no cleanup! */
1235         if (!data->rpc_done)
1236                 goto out_free;
1237         state = nfs4_opendata_to_nfs4_state(data);
1238         if (!IS_ERR(state))
1239                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1240 out_free:
1241         nfs4_opendata_put(data);
1242 }
1243
1244 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1245         .rpc_call_done = nfs4_open_confirm_done,
1246         .rpc_release = nfs4_open_confirm_release,
1247 };
1248
1249 /*
1250  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1251  */
1252 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1253 {
1254         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1255         struct rpc_task *task;
1256         struct  rpc_message msg = {
1257                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1258                 .rpc_argp = &data->c_arg,
1259                 .rpc_resp = &data->c_res,
1260                 .rpc_cred = data->owner->so_cred,
1261         };
1262         struct rpc_task_setup task_setup_data = {
1263                 .rpc_client = server->client,
1264                 .rpc_message = &msg,
1265                 .callback_ops = &nfs4_open_confirm_ops,
1266                 .callback_data = data,
1267                 .workqueue = nfsiod_workqueue,
1268                 .flags = RPC_TASK_ASYNC,
1269         };
1270         int status;
1271
1272         kref_get(&data->kref);
1273         data->rpc_done = 0;
1274         data->rpc_status = 0;
1275         data->timestamp = jiffies;
1276         task = rpc_run_task(&task_setup_data);
1277         if (IS_ERR(task))
1278                 return PTR_ERR(task);
1279         status = nfs4_wait_for_completion_rpc_task(task);
1280         if (status != 0) {
1281                 data->cancelled = 1;
1282                 smp_wmb();
1283         } else
1284                 status = data->rpc_status;
1285         rpc_put_task(task);
1286         return status;
1287 }
1288
1289 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1290 {
1291         struct nfs4_opendata *data = calldata;
1292         struct nfs4_state_owner *sp = data->owner;
1293
1294         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1295                 return;
1296         /*
1297          * Check if we still need to send an OPEN call, or if we can use
1298          * a delegation instead.
1299          */
1300         if (data->state != NULL) {
1301                 struct nfs_delegation *delegation;
1302
1303                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1304                         goto out_no_action;
1305                 rcu_read_lock();
1306                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1307                 if (delegation != NULL &&
1308                     test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) {
1309                         rcu_read_unlock();
1310                         goto out_no_action;
1311                 }
1312                 rcu_read_unlock();
1313         }
1314         /* Update sequence id. */
1315         data->o_arg.id = sp->so_owner_id.id;
1316         data->o_arg.clientid = sp->so_client->cl_clientid;
1317         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1318                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1319                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1320         }
1321         data->timestamp = jiffies;
1322         if (nfs4_setup_sequence(data->o_arg.server->nfs_client,
1323                                 &data->o_arg.seq_args,
1324                                 &data->o_res.seq_res, 1, task))
1325                 return;
1326         rpc_call_start(task);
1327         return;
1328 out_no_action:
1329         task->tk_action = NULL;
1330
1331 }
1332
1333 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1334 {
1335         struct nfs4_opendata *data = calldata;
1336
1337         data->rpc_status = task->tk_status;
1338
1339         nfs4_sequence_done_free_slot(data->o_arg.server, &data->o_res.seq_res,
1340                                      task->tk_status);
1341
1342         if (RPC_ASSASSINATED(task))
1343                 return;
1344         if (task->tk_status == 0) {
1345                 switch (data->o_res.f_attr->mode & S_IFMT) {
1346                         case S_IFREG:
1347                                 break;
1348                         case S_IFLNK:
1349                                 data->rpc_status = -ELOOP;
1350                                 break;
1351                         case S_IFDIR:
1352                                 data->rpc_status = -EISDIR;
1353                                 break;
1354                         default:
1355                                 data->rpc_status = -ENOTDIR;
1356                 }
1357                 renew_lease(data->o_res.server, data->timestamp);
1358                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1359                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1360         }
1361         data->rpc_done = 1;
1362 }
1363
1364 static void nfs4_open_release(void *calldata)
1365 {
1366         struct nfs4_opendata *data = calldata;
1367         struct nfs4_state *state = NULL;
1368
1369         /* If this request hasn't been cancelled, do nothing */
1370         if (data->cancelled == 0)
1371                 goto out_free;
1372         /* In case of error, no cleanup! */
1373         if (data->rpc_status != 0 || !data->rpc_done)
1374                 goto out_free;
1375         /* In case we need an open_confirm, no cleanup! */
1376         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1377                 goto out_free;
1378         state = nfs4_opendata_to_nfs4_state(data);
1379         if (!IS_ERR(state))
1380                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1381 out_free:
1382         nfs4_opendata_put(data);
1383 }
1384
1385 static const struct rpc_call_ops nfs4_open_ops = {
1386         .rpc_call_prepare = nfs4_open_prepare,
1387         .rpc_call_done = nfs4_open_done,
1388         .rpc_release = nfs4_open_release,
1389 };
1390
1391 /*
1392  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1393  */
1394 static int _nfs4_proc_open(struct nfs4_opendata *data)
1395 {
1396         struct inode *dir = data->dir->d_inode;
1397         struct nfs_server *server = NFS_SERVER(dir);
1398         struct nfs_openargs *o_arg = &data->o_arg;
1399         struct nfs_openres *o_res = &data->o_res;
1400         struct rpc_task *task;
1401         struct rpc_message msg = {
1402                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1403                 .rpc_argp = o_arg,
1404                 .rpc_resp = o_res,
1405                 .rpc_cred = data->owner->so_cred,
1406         };
1407         struct rpc_task_setup task_setup_data = {
1408                 .rpc_client = server->client,
1409                 .rpc_message = &msg,
1410                 .callback_ops = &nfs4_open_ops,
1411                 .callback_data = data,
1412                 .workqueue = nfsiod_workqueue,
1413                 .flags = RPC_TASK_ASYNC,
1414         };
1415         int status;
1416
1417         kref_get(&data->kref);
1418         data->rpc_done = 0;
1419         data->rpc_status = 0;
1420         data->cancelled = 0;
1421         task = rpc_run_task(&task_setup_data);
1422         if (IS_ERR(task))
1423                 return PTR_ERR(task);
1424         status = nfs4_wait_for_completion_rpc_task(task);
1425         if (status != 0) {
1426                 data->cancelled = 1;
1427                 smp_wmb();
1428         } else
1429                 status = data->rpc_status;
1430         rpc_put_task(task);
1431         if (status != 0 || !data->rpc_done)
1432                 return status;
1433
1434         if (o_res->fh.size == 0)
1435                 _nfs4_proc_lookup(dir, o_arg->name, &o_res->fh, o_res->f_attr);
1436
1437         if (o_arg->open_flags & O_CREAT) {
1438                 update_changeattr(dir, &o_res->cinfo);
1439                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1440         } else
1441                 nfs_refresh_inode(dir, o_res->dir_attr);
1442         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1443                 status = _nfs4_proc_open_confirm(data);
1444                 if (status != 0)
1445                         return status;
1446         }
1447         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1448                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1449         return 0;
1450 }
1451
1452 static int nfs4_recover_expired_lease(struct nfs_server *server)
1453 {
1454         struct nfs_client *clp = server->nfs_client;
1455         unsigned int loop;
1456         int ret;
1457
1458         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1459                 ret = nfs4_wait_clnt_recover(clp);
1460                 if (ret != 0)
1461                         break;
1462                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1463                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1464                         break;
1465                 nfs4_schedule_state_recovery(clp);
1466                 ret = -EIO;
1467         }
1468         return ret;
1469 }
1470
1471 /*
1472  * OPEN_EXPIRED:
1473  *      reclaim state on the server after a network partition.
1474  *      Assumes caller holds the appropriate lock
1475  */
1476 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1477 {
1478         struct nfs4_opendata *opendata;
1479         int ret;
1480
1481         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1482         if (IS_ERR(opendata))
1483                 return PTR_ERR(opendata);
1484         ret = nfs4_open_recover(opendata, state);
1485         if (ret == -ESTALE)
1486                 d_drop(ctx->path.dentry);
1487         nfs4_opendata_put(opendata);
1488         return ret;
1489 }
1490
1491 static inline int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1492 {
1493         struct nfs_server *server = NFS_SERVER(state->inode);
1494         struct nfs4_exception exception = { };
1495         int err;
1496
1497         do {
1498                 err = _nfs4_open_expired(ctx, state);
1499                 if (err != -NFS4ERR_DELAY)
1500                         break;
1501                 nfs4_handle_exception(server, err, &exception);
1502         } while (exception.retry);
1503         return err;
1504 }
1505
1506 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1507 {
1508         struct nfs_open_context *ctx;
1509         int ret;
1510
1511         ctx = nfs4_state_find_open_context(state);
1512         if (IS_ERR(ctx))
1513                 return PTR_ERR(ctx);
1514         ret = nfs4_do_open_expired(ctx, state);
1515         put_nfs_open_context(ctx);
1516         return ret;
1517 }
1518
1519 /*
1520  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1521  * fields corresponding to attributes that were used to store the verifier.
1522  * Make sure we clobber those fields in the later setattr call
1523  */
1524 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1525 {
1526         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1527             !(sattr->ia_valid & ATTR_ATIME_SET))
1528                 sattr->ia_valid |= ATTR_ATIME;
1529
1530         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1531             !(sattr->ia_valid & ATTR_MTIME_SET))
1532                 sattr->ia_valid |= ATTR_MTIME;
1533 }
1534
1535 /*
1536  * Returns a referenced nfs4_state
1537  */
1538 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)
1539 {
1540         struct nfs4_state_owner  *sp;
1541         struct nfs4_state     *state = NULL;
1542         struct nfs_server       *server = NFS_SERVER(dir);
1543         struct nfs4_opendata *opendata;
1544         int status;
1545
1546         /* Protect against reboot recovery conflicts */
1547         status = -ENOMEM;
1548         if (!(sp = nfs4_get_state_owner(server, cred))) {
1549                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1550                 goto out_err;
1551         }
1552         status = nfs4_recover_expired_lease(server);
1553         if (status != 0)
1554                 goto err_put_state_owner;
1555         if (path->dentry->d_inode != NULL)
1556                 nfs4_return_incompatible_delegation(path->dentry->d_inode, fmode);
1557         status = -ENOMEM;
1558         opendata = nfs4_opendata_alloc(path, sp, fmode, flags, sattr);
1559         if (opendata == NULL)
1560                 goto err_put_state_owner;
1561
1562         if (path->dentry->d_inode != NULL)
1563                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1564
1565         status = _nfs4_proc_open(opendata);
1566         if (status != 0)
1567                 goto err_opendata_put;
1568
1569         if (opendata->o_arg.open_flags & O_EXCL)
1570                 nfs4_exclusive_attrset(opendata, sattr);
1571
1572         state = nfs4_opendata_to_nfs4_state(opendata);
1573         status = PTR_ERR(state);
1574         if (IS_ERR(state))
1575                 goto err_opendata_put;
1576         nfs4_opendata_put(opendata);
1577         nfs4_put_state_owner(sp);
1578         *res = state;
1579         return 0;
1580 err_opendata_put:
1581         nfs4_opendata_put(opendata);
1582 err_put_state_owner:
1583         nfs4_put_state_owner(sp);
1584 out_err:
1585         *res = NULL;
1586         return status;
1587 }
1588
1589
1590 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)
1591 {
1592         struct nfs4_exception exception = { };
1593         struct nfs4_state *res;
1594         int status;
1595
1596         do {
1597                 status = _nfs4_do_open(dir, path, fmode, flags, sattr, cred, &res);
1598                 if (status == 0)
1599                         break;
1600                 /* NOTE: BAD_SEQID means the server and client disagree about the
1601                  * book-keeping w.r.t. state-changing operations
1602                  * (OPEN/CLOSE/LOCK/LOCKU...)
1603                  * It is actually a sign of a bug on the client or on the server.
1604                  *
1605                  * If we receive a BAD_SEQID error in the particular case of
1606                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1607                  * have unhashed the old state_owner for us, and that we can
1608                  * therefore safely retry using a new one. We should still warn
1609                  * the user though...
1610                  */
1611                 if (status == -NFS4ERR_BAD_SEQID) {
1612                         printk(KERN_WARNING "NFS: v4 server %s "
1613                                         " returned a bad sequence-id error!\n",
1614                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1615                         exception.retry = 1;
1616                         continue;
1617                 }
1618                 /*
1619                  * BAD_STATEID on OPEN means that the server cancelled our
1620                  * state before it received the OPEN_CONFIRM.
1621                  * Recover by retrying the request as per the discussion
1622                  * on Page 181 of RFC3530.
1623                  */
1624                 if (status == -NFS4ERR_BAD_STATEID) {
1625                         exception.retry = 1;
1626                         continue;
1627                 }
1628                 if (status == -EAGAIN) {
1629                         /* We must have found a delegation */
1630                         exception.retry = 1;
1631                         continue;
1632                 }
1633                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1634                                         status, &exception));
1635         } while (exception.retry);
1636         return res;
1637 }
1638
1639 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1640                             struct nfs_fattr *fattr, struct iattr *sattr,
1641                             struct nfs4_state *state)
1642 {
1643         struct nfs_server *server = NFS_SERVER(inode);
1644         struct nfs_setattrargs  arg = {
1645                 .fh             = NFS_FH(inode),
1646                 .iap            = sattr,
1647                 .server         = server,
1648                 .bitmask = server->attr_bitmask,
1649         };
1650         struct nfs_setattrres  res = {
1651                 .fattr          = fattr,
1652                 .server         = server,
1653         };
1654         struct rpc_message msg = {
1655                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1656                 .rpc_argp       = &arg,
1657                 .rpc_resp       = &res,
1658                 .rpc_cred       = cred,
1659         };
1660         unsigned long timestamp = jiffies;
1661         int status;
1662
1663         nfs_fattr_init(fattr);
1664
1665         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1666                 /* Use that stateid */
1667         } else if (state != NULL) {
1668                 nfs4_copy_stateid(&arg.stateid, state, current->files);
1669         } else
1670                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1671
1672         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
1673         if (status == 0 && state != NULL)
1674                 renew_lease(server, timestamp);
1675         return status;
1676 }
1677
1678 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1679                            struct nfs_fattr *fattr, struct iattr *sattr,
1680                            struct nfs4_state *state)
1681 {
1682         struct nfs_server *server = NFS_SERVER(inode);
1683         struct nfs4_exception exception = { };
1684         int err;
1685         do {
1686                 err = nfs4_handle_exception(server,
1687                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1688                                 &exception);
1689         } while (exception.retry);
1690         return err;
1691 }
1692
1693 struct nfs4_closedata {
1694         struct path path;
1695         struct inode *inode;
1696         struct nfs4_state *state;
1697         struct nfs_closeargs arg;
1698         struct nfs_closeres res;
1699         struct nfs_fattr fattr;
1700         unsigned long timestamp;
1701 };
1702
1703 static void nfs4_free_closedata(void *data)
1704 {
1705         struct nfs4_closedata *calldata = data;
1706         struct nfs4_state_owner *sp = calldata->state->owner;
1707
1708         nfs4_put_open_state(calldata->state);
1709         nfs_free_seqid(calldata->arg.seqid);
1710         nfs4_put_state_owner(sp);
1711         path_put(&calldata->path);
1712         kfree(calldata);
1713 }
1714
1715 static void nfs4_close_done(struct rpc_task *task, void *data)
1716 {
1717         struct nfs4_closedata *calldata = data;
1718         struct nfs4_state *state = calldata->state;
1719         struct nfs_server *server = NFS_SERVER(calldata->inode);
1720
1721         nfs4_sequence_done(server, &calldata->res.seq_res, task->tk_status);
1722         if (RPC_ASSASSINATED(task))
1723                 return;
1724         /* hmm. we are done with the inode, and in the process of freeing
1725          * the state_owner. we keep this around to process errors
1726          */
1727         switch (task->tk_status) {
1728                 case 0:
1729                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1730                         renew_lease(server, calldata->timestamp);
1731                         break;
1732                 case -NFS4ERR_STALE_STATEID:
1733                 case -NFS4ERR_OLD_STATEID:
1734                 case -NFS4ERR_BAD_STATEID:
1735                 case -NFS4ERR_EXPIRED:
1736                         if (calldata->arg.fmode == 0)
1737                                 break;
1738                 default:
1739                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN) {
1740                                 nfs4_restart_rpc(task, server->nfs_client);
1741                                 return;
1742                         }
1743         }
1744         nfs4_sequence_free_slot(server->nfs_client, &calldata->res.seq_res);
1745         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1746 }
1747
1748 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1749 {
1750         struct nfs4_closedata *calldata = data;
1751         struct nfs4_state *state = calldata->state;
1752         int clear_rd, clear_wr, clear_rdwr;
1753
1754         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1755                 return;
1756
1757         clear_rd = clear_wr = clear_rdwr = 0;
1758         spin_lock(&state->owner->so_lock);
1759         /* Calculate the change in open mode */
1760         if (state->n_rdwr == 0) {
1761                 if (state->n_rdonly == 0) {
1762                         clear_rd |= test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1763                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1764                 }
1765                 if (state->n_wronly == 0) {
1766                         clear_wr |= test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1767                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1768                 }
1769         }
1770         spin_unlock(&state->owner->so_lock);
1771         if (!clear_rd && !clear_wr && !clear_rdwr) {
1772                 /* Note: exit _without_ calling nfs4_close_done */
1773                 task->tk_action = NULL;
1774                 return;
1775         }
1776         nfs_fattr_init(calldata->res.fattr);
1777         if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0) {
1778                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1779                 calldata->arg.fmode = FMODE_READ;
1780         } else if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0) {
1781                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1782                 calldata->arg.fmode = FMODE_WRITE;
1783         }
1784         calldata->timestamp = jiffies;
1785         if (nfs4_setup_sequence((NFS_SERVER(calldata->inode))->nfs_client,
1786                                 &calldata->arg.seq_args, &calldata->res.seq_res,
1787                                 1, task))
1788                 return;
1789         rpc_call_start(task);
1790 }
1791
1792 static const struct rpc_call_ops nfs4_close_ops = {
1793         .rpc_call_prepare = nfs4_close_prepare,
1794         .rpc_call_done = nfs4_close_done,
1795         .rpc_release = nfs4_free_closedata,
1796 };
1797
1798 /* 
1799  * It is possible for data to be read/written from a mem-mapped file 
1800  * after the sys_close call (which hits the vfs layer as a flush).
1801  * This means that we can't safely call nfsv4 close on a file until 
1802  * the inode is cleared. This in turn means that we are not good
1803  * NFSv4 citizens - we do not indicate to the server to update the file's 
1804  * share state even when we are done with one of the three share 
1805  * stateid's in the inode.
1806  *
1807  * NOTE: Caller must be holding the sp->so_owner semaphore!
1808  */
1809 int nfs4_do_close(struct path *path, struct nfs4_state *state, int wait)
1810 {
1811         struct nfs_server *server = NFS_SERVER(state->inode);
1812         struct nfs4_closedata *calldata;
1813         struct nfs4_state_owner *sp = state->owner;
1814         struct rpc_task *task;
1815         struct rpc_message msg = {
1816                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1817                 .rpc_cred = state->owner->so_cred,
1818         };
1819         struct rpc_task_setup task_setup_data = {
1820                 .rpc_client = server->client,
1821                 .rpc_message = &msg,
1822                 .callback_ops = &nfs4_close_ops,
1823                 .workqueue = nfsiod_workqueue,
1824                 .flags = RPC_TASK_ASYNC,
1825         };
1826         int status = -ENOMEM;
1827
1828         calldata = kzalloc(sizeof(*calldata), GFP_KERNEL);
1829         if (calldata == NULL)
1830                 goto out;
1831         calldata->inode = state->inode;
1832         calldata->state = state;
1833         calldata->arg.fh = NFS_FH(state->inode);
1834         calldata->arg.stateid = &state->open_stateid;
1835         if (nfs4_has_session(server->nfs_client))
1836                 memset(calldata->arg.stateid->data, 0, 4);    /* clear seqid */
1837         /* Serialization for the sequence id */
1838         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1839         if (calldata->arg.seqid == NULL)
1840                 goto out_free_calldata;
1841         calldata->arg.fmode = 0;
1842         calldata->arg.bitmask = server->cache_consistency_bitmask;
1843         calldata->res.fattr = &calldata->fattr;
1844         calldata->res.seqid = calldata->arg.seqid;
1845         calldata->res.server = server;
1846         calldata->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
1847         calldata->path.mnt = mntget(path->mnt);
1848         calldata->path.dentry = dget(path->dentry);
1849
1850         msg.rpc_argp = &calldata->arg,
1851         msg.rpc_resp = &calldata->res,
1852         task_setup_data.callback_data = calldata;
1853         task = rpc_run_task(&task_setup_data);
1854         if (IS_ERR(task))
1855                 return PTR_ERR(task);
1856         status = 0;
1857         if (wait)
1858                 status = rpc_wait_for_completion_task(task);
1859         rpc_put_task(task);
1860         return status;
1861 out_free_calldata:
1862         kfree(calldata);
1863 out:
1864         nfs4_put_open_state(state);
1865         nfs4_put_state_owner(sp);
1866         return status;
1867 }
1868
1869 static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state, fmode_t fmode)
1870 {
1871         struct file *filp;
1872         int ret;
1873
1874         /* If the open_intent is for execute, we have an extra check to make */
1875         if (fmode & FMODE_EXEC) {
1876                 ret = nfs_may_open(state->inode,
1877                                 state->owner->so_cred,
1878                                 nd->intent.open.flags);
1879                 if (ret < 0)
1880                         goto out_close;
1881         }
1882         filp = lookup_instantiate_filp(nd, path->dentry, NULL);
1883         if (!IS_ERR(filp)) {
1884                 struct nfs_open_context *ctx;
1885                 ctx = nfs_file_open_context(filp);
1886                 ctx->state = state;
1887                 return 0;
1888         }
1889         ret = PTR_ERR(filp);
1890 out_close:
1891         nfs4_close_sync(path, state, fmode & (FMODE_READ|FMODE_WRITE));
1892         return ret;
1893 }
1894
1895 struct dentry *
1896 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1897 {
1898         struct path path = {
1899                 .mnt = nd->path.mnt,
1900                 .dentry = dentry,
1901         };
1902         struct dentry *parent;
1903         struct iattr attr;
1904         struct rpc_cred *cred;
1905         struct nfs4_state *state;
1906         struct dentry *res;
1907         fmode_t fmode = nd->intent.open.flags & (FMODE_READ | FMODE_WRITE | FMODE_EXEC);
1908
1909         if (nd->flags & LOOKUP_CREATE) {
1910                 attr.ia_mode = nd->intent.open.create_mode;
1911                 attr.ia_valid = ATTR_MODE;
1912                 if (!IS_POSIXACL(dir))
1913                         attr.ia_mode &= ~current_umask();
1914         } else {
1915                 attr.ia_valid = 0;
1916                 BUG_ON(nd->intent.open.flags & O_CREAT);
1917         }
1918
1919         cred = rpc_lookup_cred();
1920         if (IS_ERR(cred))
1921                 return (struct dentry *)cred;
1922         parent = dentry->d_parent;
1923         /* Protect against concurrent sillydeletes */
1924         nfs_block_sillyrename(parent);
1925         state = nfs4_do_open(dir, &path, fmode, nd->intent.open.flags, &attr, cred);
1926         put_rpccred(cred);
1927         if (IS_ERR(state)) {
1928                 if (PTR_ERR(state) == -ENOENT) {
1929                         d_add(dentry, NULL);
1930                         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1931                 }
1932                 nfs_unblock_sillyrename(parent);
1933                 return (struct dentry *)state;
1934         }
1935         res = d_add_unique(dentry, igrab(state->inode));
1936         if (res != NULL)
1937                 path.dentry = res;
1938         nfs_set_verifier(path.dentry, nfs_save_change_attribute(dir));
1939         nfs_unblock_sillyrename(parent);
1940         nfs4_intent_set_file(nd, &path, state, fmode);
1941         return res;
1942 }
1943
1944 int
1945 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1946 {
1947         struct path path = {
1948                 .mnt = nd->path.mnt,
1949                 .dentry = dentry,
1950         };
1951         struct rpc_cred *cred;
1952         struct nfs4_state *state;
1953         fmode_t fmode = openflags & (FMODE_READ | FMODE_WRITE);
1954
1955         cred = rpc_lookup_cred();
1956         if (IS_ERR(cred))
1957                 return PTR_ERR(cred);
1958         state = nfs4_do_open(dir, &path, fmode, openflags, NULL, cred);
1959         put_rpccred(cred);
1960         if (IS_ERR(state)) {
1961                 switch (PTR_ERR(state)) {
1962                         case -EPERM:
1963                         case -EACCES:
1964                         case -EDQUOT:
1965                         case -ENOSPC:
1966                         case -EROFS:
1967                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1968                                 return 1;
1969                         default:
1970                                 goto out_drop;
1971                 }
1972         }
1973         if (state->inode == dentry->d_inode) {
1974                 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1975                 nfs4_intent_set_file(nd, &path, state, fmode);
1976                 return 1;
1977         }
1978         nfs4_close_sync(&path, state, fmode);
1979 out_drop:
1980         d_drop(dentry);
1981         return 0;
1982 }
1983
1984 void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
1985 {
1986         if (ctx->state == NULL)
1987                 return;
1988         if (is_sync)
1989                 nfs4_close_sync(&ctx->path, ctx->state, ctx->mode);
1990         else
1991                 nfs4_close_state(&ctx->path, ctx->state, ctx->mode);
1992 }
1993
1994 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1995 {
1996         struct nfs4_server_caps_arg args = {
1997                 .fhandle = fhandle,
1998         };
1999         struct nfs4_server_caps_res res = {};
2000         struct rpc_message msg = {
2001                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2002                 .rpc_argp = &args,
2003                 .rpc_resp = &res,
2004         };
2005         int status;
2006
2007         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2008         if (status == 0) {
2009                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2010                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2011                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2012                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2013                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2014                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2015                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2016                         server->caps |= NFS_CAP_ACLS;
2017                 if (res.has_links != 0)
2018                         server->caps |= NFS_CAP_HARDLINKS;
2019                 if (res.has_symlinks != 0)
2020                         server->caps |= NFS_CAP_SYMLINKS;
2021                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2022                         server->caps |= NFS_CAP_FILEID;
2023                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2024                         server->caps |= NFS_CAP_MODE;
2025                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2026                         server->caps |= NFS_CAP_NLINK;
2027                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2028                         server->caps |= NFS_CAP_OWNER;
2029                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2030                         server->caps |= NFS_CAP_OWNER_GROUP;
2031                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2032                         server->caps |= NFS_CAP_ATIME;
2033                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2034                         server->caps |= NFS_CAP_CTIME;
2035                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2036                         server->caps |= NFS_CAP_MTIME;
2037
2038                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2039                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2040                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2041                 server->acl_bitmask = res.acl_bitmask;
2042         }
2043
2044         return status;
2045 }
2046
2047 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2048 {
2049         struct nfs4_exception exception = { };
2050         int err;
2051         do {
2052                 err = nfs4_handle_exception(server,
2053                                 _nfs4_server_capabilities(server, fhandle),
2054                                 &exception);
2055         } while (exception.retry);
2056         return err;
2057 }
2058
2059 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2060                 struct nfs_fsinfo *info)
2061 {
2062         struct nfs4_lookup_root_arg args = {
2063                 .bitmask = nfs4_fattr_bitmap,
2064         };
2065         struct nfs4_lookup_res res = {
2066                 .server = server,
2067                 .fattr = info->fattr,
2068                 .fh = fhandle,
2069         };
2070         struct rpc_message msg = {
2071                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2072                 .rpc_argp = &args,
2073                 .rpc_resp = &res,
2074         };
2075
2076         nfs_fattr_init(info->fattr);
2077         return nfs4_call_sync(server, &msg, &args, &res, 0);
2078 }
2079
2080 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2081                 struct nfs_fsinfo *info)
2082 {
2083         struct nfs4_exception exception = { };
2084         int err;
2085         do {
2086                 err = nfs4_handle_exception(server,
2087                                 _nfs4_lookup_root(server, fhandle, info),
2088                                 &exception);
2089         } while (exception.retry);
2090         return err;
2091 }
2092
2093 /*
2094  * get the file handle for the "/" directory on the server
2095  */
2096 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2097                               struct nfs_fsinfo *info)
2098 {
2099         int status;
2100
2101         status = nfs4_lookup_root(server, fhandle, info);
2102         if (status == 0)
2103                 status = nfs4_server_capabilities(server, fhandle);
2104         if (status == 0)
2105                 status = nfs4_do_fsinfo(server, fhandle, info);
2106         return nfs4_map_errors(status);
2107 }
2108
2109 /*
2110  * Get locations and (maybe) other attributes of a referral.
2111  * Note that we'll actually follow the referral later when
2112  * we detect fsid mismatch in inode revalidation
2113  */
2114 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2115 {
2116         int status = -ENOMEM;
2117         struct page *page = NULL;
2118         struct nfs4_fs_locations *locations = NULL;
2119
2120         page = alloc_page(GFP_KERNEL);
2121         if (page == NULL)
2122                 goto out;
2123         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2124         if (locations == NULL)
2125                 goto out;
2126
2127         status = nfs4_proc_fs_locations(dir, name, locations, page);
2128         if (status != 0)
2129                 goto out;
2130         /* Make sure server returned a different fsid for the referral */
2131         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2132                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __func__, name->name);
2133                 status = -EIO;
2134                 goto out;
2135         }
2136
2137         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2138         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
2139         if (!fattr->mode)
2140                 fattr->mode = S_IFDIR;
2141         memset(fhandle, 0, sizeof(struct nfs_fh));
2142 out:
2143         if (page)
2144                 __free_page(page);
2145         if (locations)
2146                 kfree(locations);
2147         return status;
2148 }
2149
2150 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2151 {
2152         struct nfs4_getattr_arg args = {
2153                 .fh = fhandle,
2154                 .bitmask = server->attr_bitmask,
2155         };
2156         struct nfs4_getattr_res res = {
2157                 .fattr = fattr,
2158                 .server = server,
2159         };
2160         struct rpc_message msg = {
2161                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2162                 .rpc_argp = &args,
2163                 .rpc_resp = &res,
2164         };
2165         
2166         nfs_fattr_init(fattr);
2167         return nfs4_call_sync(server, &msg, &args, &res, 0);
2168 }
2169
2170 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2171 {
2172         struct nfs4_exception exception = { };
2173         int err;
2174         do {
2175                 err = nfs4_handle_exception(server,
2176                                 _nfs4_proc_getattr(server, fhandle, fattr),
2177                                 &exception);
2178         } while (exception.retry);
2179         return err;
2180 }
2181
2182 /* 
2183  * The file is not closed if it is opened due to the a request to change
2184  * the size of the file. The open call will not be needed once the
2185  * VFS layer lookup-intents are implemented.
2186  *
2187  * Close is called when the inode is destroyed.
2188  * If we haven't opened the file for O_WRONLY, we
2189  * need to in the size_change case to obtain a stateid.
2190  *
2191  * Got race?
2192  * Because OPEN is always done by name in nfsv4, it is
2193  * possible that we opened a different file by the same
2194  * name.  We can recognize this race condition, but we
2195  * can't do anything about it besides returning an error.
2196  *
2197  * This will be fixed with VFS changes (lookup-intent).
2198  */
2199 static int
2200 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2201                   struct iattr *sattr)
2202 {
2203         struct inode *inode = dentry->d_inode;
2204         struct rpc_cred *cred = NULL;
2205         struct nfs4_state *state = NULL;
2206         int status;
2207
2208         nfs_fattr_init(fattr);
2209         
2210         /* Search for an existing open(O_WRITE) file */
2211         if (sattr->ia_valid & ATTR_FILE) {
2212                 struct nfs_open_context *ctx;
2213
2214                 ctx = nfs_file_open_context(sattr->ia_file);
2215                 if (ctx) {
2216                         cred = ctx->cred;
2217                         state = ctx->state;
2218                 }
2219         }
2220
2221         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2222         if (status == 0)
2223                 nfs_setattr_update_inode(inode, sattr);
2224         return status;
2225 }
2226
2227 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
2228                 const struct qstr *name, struct nfs_fh *fhandle,
2229                 struct nfs_fattr *fattr)
2230 {
2231         int                    status;
2232         struct nfs4_lookup_arg args = {
2233                 .bitmask = server->attr_bitmask,
2234                 .dir_fh = dirfh,
2235                 .name = name,
2236         };
2237         struct nfs4_lookup_res res = {
2238                 .server = server,
2239                 .fattr = fattr,
2240                 .fh = fhandle,
2241         };
2242         struct rpc_message msg = {
2243                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2244                 .rpc_argp = &args,
2245                 .rpc_resp = &res,
2246         };
2247
2248         nfs_fattr_init(fattr);
2249
2250         dprintk("NFS call  lookupfh %s\n", name->name);
2251         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2252         dprintk("NFS reply lookupfh: %d\n", status);
2253         return status;
2254 }
2255
2256 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
2257                               struct qstr *name, struct nfs_fh *fhandle,
2258                               struct nfs_fattr *fattr)
2259 {
2260         struct nfs4_exception exception = { };
2261         int err;
2262         do {
2263                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
2264                 /* FIXME: !!!! */
2265                 if (err == -NFS4ERR_MOVED) {
2266                         err = -EREMOTE;
2267                         break;
2268                 }
2269                 err = nfs4_handle_exception(server, err, &exception);
2270         } while (exception.retry);
2271         return err;
2272 }
2273
2274 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
2275                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2276 {
2277         int status;
2278         
2279         dprintk("NFS call  lookup %s\n", name->name);
2280         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
2281         if (status == -NFS4ERR_MOVED)
2282                 status = nfs4_get_referral(dir, name, fattr, fhandle);
2283         dprintk("NFS reply lookup: %d\n", status);
2284         return status;
2285 }
2286
2287 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2288 {
2289         struct nfs4_exception exception = { };
2290         int err;
2291         do {
2292                 err = nfs4_handle_exception(NFS_SERVER(dir),
2293                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
2294                                 &exception);
2295         } while (exception.retry);
2296         return err;
2297 }
2298
2299 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2300 {
2301         struct nfs_server *server = NFS_SERVER(inode);
2302         struct nfs_fattr fattr;
2303         struct nfs4_accessargs args = {
2304                 .fh = NFS_FH(inode),
2305                 .bitmask = server->attr_bitmask,
2306         };
2307         struct nfs4_accessres res = {
2308                 .server = server,
2309                 .fattr = &fattr,
2310         };
2311         struct rpc_message msg = {
2312                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2313                 .rpc_argp = &args,
2314                 .rpc_resp = &res,
2315                 .rpc_cred = entry->cred,
2316         };
2317         int mode = entry->mask;
2318         int status;
2319
2320         /*
2321          * Determine which access bits we want to ask for...
2322          */
2323         if (mode & MAY_READ)
2324                 args.access |= NFS4_ACCESS_READ;
2325         if (S_ISDIR(inode->i_mode)) {
2326                 if (mode & MAY_WRITE)
2327                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2328                 if (mode & MAY_EXEC)
2329                         args.access |= NFS4_ACCESS_LOOKUP;
2330         } else {
2331                 if (mode & MAY_WRITE)
2332                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2333                 if (mode & MAY_EXEC)
2334                         args.access |= NFS4_ACCESS_EXECUTE;
2335         }
2336         nfs_fattr_init(&fattr);
2337         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2338         if (!status) {
2339                 entry->mask = 0;
2340                 if (res.access & NFS4_ACCESS_READ)
2341                         entry->mask |= MAY_READ;
2342                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2343                         entry->mask |= MAY_WRITE;
2344                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2345                         entry->mask |= MAY_EXEC;
2346                 nfs_refresh_inode(inode, &fattr);
2347         }
2348         return status;
2349 }
2350
2351 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2352 {
2353         struct nfs4_exception exception = { };
2354         int err;
2355         do {
2356                 err = nfs4_handle_exception(NFS_SERVER(inode),
2357                                 _nfs4_proc_access(inode, entry),
2358                                 &exception);
2359         } while (exception.retry);
2360         return err;
2361 }
2362
2363 /*
2364  * TODO: For the time being, we don't try to get any attributes
2365  * along with any of the zero-copy operations READ, READDIR,
2366  * READLINK, WRITE.
2367  *
2368  * In the case of the first three, we want to put the GETATTR
2369  * after the read-type operation -- this is because it is hard
2370  * to predict the length of a GETATTR response in v4, and thus
2371  * align the READ data correctly.  This means that the GETATTR
2372  * may end up partially falling into the page cache, and we should
2373  * shift it into the 'tail' of the xdr_buf before processing.
2374  * To do this efficiently, we need to know the total length
2375  * of data received, which doesn't seem to be available outside
2376  * of the RPC layer.
2377  *
2378  * In the case of WRITE, we also want to put the GETATTR after
2379  * the operation -- in this case because we want to make sure
2380  * we get the post-operation mtime and size.  This means that
2381  * we can't use xdr_encode_pages() as written: we need a variant
2382  * of it which would leave room in the 'tail' iovec.
2383  *
2384  * Both of these changes to the XDR layer would in fact be quite
2385  * minor, but I decided to leave them for a subsequent patch.
2386  */
2387 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2388                 unsigned int pgbase, unsigned int pglen)
2389 {
2390         struct nfs4_readlink args = {
2391                 .fh       = NFS_FH(inode),
2392                 .pgbase   = pgbase,
2393                 .pglen    = pglen,
2394                 .pages    = &page,
2395         };
2396         struct nfs4_readlink_res res;
2397         struct rpc_message msg = {
2398                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2399                 .rpc_argp = &args,
2400                 .rpc_resp = &res,
2401         };
2402
2403         return nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
2404 }
2405
2406 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2407                 unsigned int pgbase, unsigned int pglen)
2408 {
2409         struct nfs4_exception exception = { };
2410         int err;
2411         do {
2412                 err = nfs4_handle_exception(NFS_SERVER(inode),
2413                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2414                                 &exception);
2415         } while (exception.retry);
2416         return err;
2417 }
2418
2419 /*
2420  * Got race?
2421  * We will need to arrange for the VFS layer to provide an atomic open.
2422  * Until then, this create/open method is prone to inefficiency and race
2423  * conditions due to the lookup, create, and open VFS calls from sys_open()
2424  * placed on the wire.
2425  *
2426  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2427  * The file will be opened again in the subsequent VFS open call
2428  * (nfs4_proc_file_open).
2429  *
2430  * The open for read will just hang around to be used by any process that
2431  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2432  */
2433
2434 static int
2435 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2436                  int flags, struct nameidata *nd)
2437 {
2438         struct path path = {
2439                 .mnt = nd->path.mnt,
2440                 .dentry = dentry,
2441         };
2442         struct nfs4_state *state;
2443         struct rpc_cred *cred;
2444         fmode_t fmode = flags & (FMODE_READ | FMODE_WRITE);
2445         int status = 0;
2446
2447         cred = rpc_lookup_cred();
2448         if (IS_ERR(cred)) {
2449                 status = PTR_ERR(cred);
2450                 goto out;
2451         }
2452         state = nfs4_do_open(dir, &path, fmode, flags, sattr, cred);
2453         d_drop(dentry);
2454         if (IS_ERR(state)) {
2455                 status = PTR_ERR(state);
2456                 goto out_putcred;
2457         }
2458         d_add(dentry, igrab(state->inode));
2459         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2460         if (flags & O_EXCL) {
2461                 struct nfs_fattr fattr;
2462                 status = nfs4_do_setattr(state->inode, cred, &fattr, sattr, state);
2463                 if (status == 0)
2464                         nfs_setattr_update_inode(state->inode, sattr);
2465                 nfs_post_op_update_inode(state->inode, &fattr);
2466         }
2467         if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
2468                 status = nfs4_intent_set_file(nd, &path, state, fmode);
2469         else
2470                 nfs4_close_sync(&path, state, fmode);
2471 out_putcred:
2472         put_rpccred(cred);
2473 out:
2474         return status;
2475 }
2476
2477 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2478 {
2479         struct nfs_server *server = NFS_SERVER(dir);
2480         struct nfs_removeargs args = {
2481                 .fh = NFS_FH(dir),
2482                 .name.len = name->len,
2483                 .name.name = name->name,
2484                 .bitmask = server->attr_bitmask,
2485         };
2486         struct nfs_removeres res = {
2487                 .server = server,
2488         };
2489         struct rpc_message msg = {
2490                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2491                 .rpc_argp = &args,
2492                 .rpc_resp = &res,
2493         };
2494         int                     status;
2495
2496         nfs_fattr_init(&res.dir_attr);
2497         status = nfs4_call_sync(server, &msg, &args, &res, 1);
2498         if (status == 0) {
2499                 update_changeattr(dir, &res.cinfo);
2500                 nfs_post_op_update_inode(dir, &res.dir_attr);
2501         }
2502         return status;
2503 }
2504
2505 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2506 {
2507         struct nfs4_exception exception = { };
2508         int err;
2509         do {
2510                 err = nfs4_handle_exception(NFS_SERVER(dir),
2511                                 _nfs4_proc_remove(dir, name),
2512                                 &exception);
2513         } while (exception.retry);
2514         return err;
2515 }
2516
2517 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2518 {
2519         struct nfs_server *server = NFS_SERVER(dir);
2520         struct nfs_removeargs *args = msg->rpc_argp;
2521         struct nfs_removeres *res = msg->rpc_resp;
2522
2523         args->bitmask = server->cache_consistency_bitmask;
2524         res->server = server;
2525         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2526 }
2527
2528 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2529 {
2530         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2531
2532         nfs4_sequence_done(res->server, &res->seq_res, task->tk_status);
2533         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2534                 return 0;
2535         nfs4_sequence_free_slot(res->server->nfs_client, &res->seq_res);
2536         update_changeattr(dir, &res->cinfo);
2537         nfs_post_op_update_inode(dir, &res->dir_attr);
2538         return 1;
2539 }
2540
2541 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2542                 struct inode *new_dir, struct qstr *new_name)
2543 {
2544         struct nfs_server *server = NFS_SERVER(old_dir);
2545         struct nfs4_rename_arg arg = {
2546                 .old_dir = NFS_FH(old_dir),
2547                 .new_dir = NFS_FH(new_dir),
2548                 .old_name = old_name,
2549                 .new_name = new_name,
2550                 .bitmask = server->attr_bitmask,
2551         };
2552         struct nfs_fattr old_fattr, new_fattr;
2553         struct nfs4_rename_res res = {
2554                 .server = server,
2555                 .old_fattr = &old_fattr,
2556                 .new_fattr = &new_fattr,
2557         };
2558         struct rpc_message msg = {
2559                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2560                 .rpc_argp = &arg,
2561                 .rpc_resp = &res,
2562         };
2563         int                     status;
2564         
2565         nfs_fattr_init(res.old_fattr);
2566         nfs_fattr_init(res.new_fattr);
2567         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2568
2569         if (!status) {
2570                 update_changeattr(old_dir, &res.old_cinfo);
2571                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2572                 update_changeattr(new_dir, &res.new_cinfo);
2573                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2574         }
2575         return status;
2576 }
2577
2578 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2579                 struct inode *new_dir, struct qstr *new_name)
2580 {
2581         struct nfs4_exception exception = { };
2582         int err;
2583         do {
2584                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2585                                 _nfs4_proc_rename(old_dir, old_name,
2586                                         new_dir, new_name),
2587                                 &exception);
2588         } while (exception.retry);
2589         return err;
2590 }
2591
2592 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2593 {
2594         struct nfs_server *server = NFS_SERVER(inode);
2595         struct nfs4_link_arg arg = {
2596                 .fh     = NFS_FH(inode),
2597                 .dir_fh = NFS_FH(dir),
2598                 .name   = name,
2599                 .bitmask = server->attr_bitmask,
2600         };
2601         struct nfs_fattr fattr, dir_attr;
2602         struct nfs4_link_res res = {
2603                 .server = server,
2604                 .fattr = &fattr,
2605                 .dir_attr = &dir_attr,
2606         };
2607         struct rpc_message msg = {
2608                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2609                 .rpc_argp = &arg,
2610                 .rpc_resp = &res,
2611         };
2612         int                     status;
2613
2614         nfs_fattr_init(res.fattr);
2615         nfs_fattr_init(res.dir_attr);
2616         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2617         if (!status) {
2618                 update_changeattr(dir, &res.cinfo);
2619                 nfs_post_op_update_inode(dir, res.dir_attr);
2620                 nfs_post_op_update_inode(inode, res.fattr);
2621         }
2622
2623         return status;
2624 }
2625
2626 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2627 {
2628         struct nfs4_exception exception = { };
2629         int err;
2630         do {
2631                 err = nfs4_handle_exception(NFS_SERVER(inode),
2632                                 _nfs4_proc_link(inode, dir, name),
2633                                 &exception);
2634         } while (exception.retry);
2635         return err;
2636 }
2637
2638 struct nfs4_createdata {
2639         struct rpc_message msg;
2640         struct nfs4_create_arg arg;
2641         struct nfs4_create_res res;
2642         struct nfs_fh fh;
2643         struct nfs_fattr fattr;
2644         struct nfs_fattr dir_fattr;
2645 };
2646
2647 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2648                 struct qstr *name, struct iattr *sattr, u32 ftype)
2649 {
2650         struct nfs4_createdata *data;
2651
2652         data = kzalloc(sizeof(*data), GFP_KERNEL);
2653         if (data != NULL) {
2654                 struct nfs_server *server = NFS_SERVER(dir);
2655
2656                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2657                 data->msg.rpc_argp = &data->arg;
2658                 data->msg.rpc_resp = &data->res;
2659                 data->arg.dir_fh = NFS_FH(dir);
2660                 data->arg.server = server;
2661                 data->arg.name = name;
2662                 data->arg.attrs = sattr;
2663                 data->arg.ftype = ftype;
2664                 data->arg.bitmask = server->attr_bitmask;
2665                 data->res.server = server;
2666                 data->res.fh = &data->fh;
2667                 data->res.fattr = &data->fattr;
2668                 data->res.dir_fattr = &data->dir_fattr;
2669                 nfs_fattr_init(data->res.fattr);
2670                 nfs_fattr_init(data->res.dir_fattr);
2671         }
2672         return data;
2673 }
2674
2675 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2676 {
2677         int status = nfs4_call_sync(NFS_SERVER(dir), &data->msg,
2678                                     &data->arg, &data->res, 1);
2679         if (status == 0) {
2680                 update_changeattr(dir, &data->res.dir_cinfo);
2681                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2682                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2683         }
2684         return status;
2685 }
2686
2687 static void nfs4_free_createdata(struct nfs4_createdata *data)
2688 {
2689         kfree(data);
2690 }
2691
2692 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2693                 struct page *page, unsigned int len, struct iattr *sattr)
2694 {
2695         struct nfs4_createdata *data;
2696         int status = -ENAMETOOLONG;
2697
2698         if (len > NFS4_MAXPATHLEN)
2699                 goto out;
2700
2701         status = -ENOMEM;
2702         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2703         if (data == NULL)
2704                 goto out;
2705
2706         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2707         data->arg.u.symlink.pages = &page;
2708         data->arg.u.symlink.len = len;
2709         
2710         status = nfs4_do_create(dir, dentry, data);
2711
2712         nfs4_free_createdata(data);
2713 out:
2714         return status;
2715 }
2716
2717 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2718                 struct page *page, unsigned int len, struct iattr *sattr)
2719 {
2720         struct nfs4_exception exception = { };
2721         int err;
2722         do {
2723                 err = nfs4_handle_exception(NFS_SERVER(dir),
2724                                 _nfs4_proc_symlink(dir, dentry, page,
2725                                                         len, sattr),
2726                                 &exception);
2727         } while (exception.retry);
2728         return err;
2729 }
2730
2731 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2732                 struct iattr *sattr)
2733 {
2734         struct nfs4_createdata *data;
2735         int status = -ENOMEM;
2736
2737         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2738         if (data == NULL)
2739                 goto out;
2740
2741         status = nfs4_do_create(dir, dentry, data);
2742
2743         nfs4_free_createdata(data);
2744 out:
2745         return status;
2746 }
2747
2748 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2749                 struct iattr *sattr)
2750 {
2751         struct nfs4_exception exception = { };
2752         int err;
2753         do {
2754                 err = nfs4_handle_exception(NFS_SERVER(dir),
2755                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2756                                 &exception);
2757         } while (exception.retry);
2758         return err;
2759 }
2760
2761 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2762                   u64 cookie, struct page *page, unsigned int count, int plus)
2763 {
2764         struct inode            *dir = dentry->d_inode;
2765         struct nfs4_readdir_arg args = {
2766                 .fh = NFS_FH(dir),
2767                 .pages = &page,
2768                 .pgbase = 0,
2769                 .count = count,
2770                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2771         };
2772         struct nfs4_readdir_res res;
2773         struct rpc_message msg = {
2774                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2775                 .rpc_argp = &args,
2776                 .rpc_resp = &res,
2777                 .rpc_cred = cred,
2778         };
2779         int                     status;
2780
2781         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
2782                         dentry->d_parent->d_name.name,
2783                         dentry->d_name.name,
2784                         (unsigned long long)cookie);
2785         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2786         res.pgbase = args.pgbase;
2787         status = nfs4_call_sync(NFS_SERVER(dir), &msg, &args, &res, 0);
2788         if (status == 0)
2789                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2790
2791         nfs_invalidate_atime(dir);
2792
2793         dprintk("%s: returns %d\n", __func__, status);
2794         return status;
2795 }
2796
2797 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2798                   u64 cookie, struct page *page, unsigned int count, int plus)
2799 {
2800         struct nfs4_exception exception = { };
2801         int err;
2802         do {
2803                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2804                                 _nfs4_proc_readdir(dentry, cred, cookie,
2805                                         page, count, plus),
2806                                 &exception);
2807         } while (exception.retry);
2808         return err;
2809 }
2810
2811 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2812                 struct iattr *sattr, dev_t rdev)
2813 {
2814         struct nfs4_createdata *data;
2815         int mode = sattr->ia_mode;
2816         int status = -ENOMEM;
2817
2818         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2819         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2820
2821         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
2822         if (data == NULL)
2823                 goto out;
2824
2825         if (S_ISFIFO(mode))
2826                 data->arg.ftype = NF4FIFO;
2827         else if (S_ISBLK(mode)) {
2828                 data->arg.ftype = NF4BLK;
2829                 data->arg.u.device.specdata1 = MAJOR(rdev);
2830                 data->arg.u.device.specdata2 = MINOR(rdev);
2831         }
2832         else if (S_ISCHR(mode)) {
2833                 data->arg.ftype = NF4CHR;
2834                 data->arg.u.device.specdata1 = MAJOR(rdev);
2835                 data->arg.u.device.specdata2 = MINOR(rdev);
2836         }
2837         
2838         status = nfs4_do_create(dir, dentry, data);
2839
2840         nfs4_free_createdata(data);
2841 out:
2842         return status;
2843 }
2844
2845 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2846                 struct iattr *sattr, dev_t rdev)
2847 {
2848         struct nfs4_exception exception = { };
2849         int err;
2850         do {
2851                 err = nfs4_handle_exception(NFS_SERVER(dir),
2852                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2853                                 &exception);
2854         } while (exception.retry);
2855         return err;
2856 }
2857
2858 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2859                  struct nfs_fsstat *fsstat)
2860 {
2861         struct nfs4_statfs_arg args = {
2862                 .fh = fhandle,
2863                 .bitmask = server->attr_bitmask,
2864         };
2865         struct nfs4_statfs_res res = {
2866                 .fsstat = fsstat,
2867         };
2868         struct rpc_message msg = {
2869                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2870                 .rpc_argp = &args,
2871                 .rpc_resp = &res,
2872         };
2873
2874         nfs_fattr_init(fsstat->fattr);
2875         return  nfs4_call_sync(server, &msg, &args, &res, 0);
2876 }
2877
2878 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2879 {
2880         struct nfs4_exception exception = { };
2881         int err;
2882         do {
2883                 err = nfs4_handle_exception(server,
2884                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2885                                 &exception);
2886         } while (exception.retry);
2887         return err;
2888 }
2889
2890 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2891                 struct nfs_fsinfo *fsinfo)
2892 {
2893         struct nfs4_fsinfo_arg args = {
2894                 .fh = fhandle,
2895                 .bitmask = server->attr_bitmask,
2896         };
2897         struct nfs4_fsinfo_res res = {
2898                 .fsinfo = fsinfo,
2899         };
2900         struct rpc_message msg = {
2901                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2902                 .rpc_argp = &args,
2903                 .rpc_resp = &res,
2904         };
2905
2906         return nfs4_call_sync(server, &msg, &args, &res, 0);
2907 }
2908
2909 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2910 {
2911         struct nfs4_exception exception = { };
2912         int err;
2913
2914         do {
2915                 err = nfs4_handle_exception(server,
2916                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2917                                 &exception);
2918         } while (exception.retry);
2919         return err;
2920 }
2921
2922 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2923 {
2924         nfs_fattr_init(fsinfo->fattr);
2925         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2926 }
2927
2928 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2929                 struct nfs_pathconf *pathconf)
2930 {
2931         struct nfs4_pathconf_arg args = {
2932                 .fh = fhandle,
2933                 .bitmask = server->attr_bitmask,
2934         };
2935         struct nfs4_pathconf_res res = {
2936                 .pathconf = pathconf,
2937         };
2938         struct rpc_message msg = {
2939                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2940                 .rpc_argp = &args,
2941                 .rpc_resp = &res,
2942         };
2943
2944         /* None of the pathconf attributes are mandatory to implement */
2945         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2946                 memset(pathconf, 0, sizeof(*pathconf));
2947                 return 0;
2948         }
2949
2950         nfs_fattr_init(pathconf->fattr);
2951         return nfs4_call_sync(server, &msg, &args, &res, 0);
2952 }
2953
2954 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2955                 struct nfs_pathconf *pathconf)
2956 {
2957         struct nfs4_exception exception = { };
2958         int err;
2959
2960         do {
2961                 err = nfs4_handle_exception(server,
2962                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2963                                 &exception);
2964         } while (exception.retry);
2965         return err;
2966 }
2967
2968 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
2969 {
2970         struct nfs_server *server = NFS_SERVER(data->inode);
2971
2972         dprintk("--> %s\n", __func__);
2973
2974         /* nfs4_sequence_free_slot called in the read rpc_call_done */
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         /* slot is freed in nfs_writeback_done */
2999         nfs4_sequence_done(NFS_SERVER(inode), &data->res.seq_res,
3000                            task->tk_status);
3001
3002         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3003                 nfs4_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3004                 return -EAGAIN;
3005         }
3006         if (task->tk_status >= 0) {
3007                 renew_lease(NFS_SERVER(inode), data->timestamp);
3008                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3009         }
3010         return 0;
3011 }
3012
3013 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3014 {
3015         struct nfs_server *server = NFS_SERVER(data->inode);
3016
3017         data->args.bitmask = server->cache_consistency_bitmask;
3018         data->res.server = server;
3019         data->timestamp   = jiffies;
3020
3021         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3022 }
3023
3024 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3025 {
3026         struct inode *inode = data->inode;
3027         
3028         nfs4_sequence_done(NFS_SERVER(inode), &data->res.seq_res,
3029                            task->tk_status);
3030         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3031                 nfs4_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3032                 return -EAGAIN;
3033         }
3034         nfs4_sequence_free_slot(NFS_SERVER(inode)->nfs_client,
3035                                 &data->res.seq_res);
3036         nfs_refresh_inode(inode, data->res.fattr);
3037         return 0;
3038 }
3039
3040 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3041 {
3042         struct nfs_server *server = NFS_SERVER(data->inode);
3043         
3044         data->args.bitmask = server->cache_consistency_bitmask;
3045         data->res.server = server;
3046         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3047 }
3048
3049 /*
3050  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3051  * standalone procedure for queueing an asynchronous RENEW.
3052  */
3053 static void nfs4_renew_done(struct rpc_task *task, void *data)
3054 {
3055         struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
3056         unsigned long timestamp = (unsigned long)data;
3057
3058         if (task->tk_status < 0) {
3059                 /* Unless we're shutting down, schedule state recovery! */
3060                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) != 0)
3061                         nfs4_schedule_state_recovery(clp);
3062                 return;
3063         }
3064         spin_lock(&clp->cl_lock);
3065         if (time_before(clp->cl_last_renewal,timestamp))
3066                 clp->cl_last_renewal = timestamp;
3067         spin_unlock(&clp->cl_lock);
3068 }
3069
3070 static const struct rpc_call_ops nfs4_renew_ops = {
3071         .rpc_call_done = nfs4_renew_done,
3072 };
3073
3074 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
3075 {
3076         struct rpc_message msg = {
3077                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3078                 .rpc_argp       = clp,
3079                 .rpc_cred       = cred,
3080         };
3081
3082         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3083                         &nfs4_renew_ops, (void *)jiffies);
3084 }
3085
3086 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3087 {
3088         struct rpc_message msg = {
3089                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3090                 .rpc_argp       = clp,
3091                 .rpc_cred       = cred,
3092         };
3093         unsigned long now = jiffies;
3094         int status;
3095
3096         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3097         if (status < 0)
3098                 return status;
3099         spin_lock(&clp->cl_lock);
3100         if (time_before(clp->cl_last_renewal,now))
3101                 clp->cl_last_renewal = now;
3102         spin_unlock(&clp->cl_lock);
3103         return 0;
3104 }
3105
3106 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3107 {
3108         return (server->caps & NFS_CAP_ACLS)
3109                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3110                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3111 }
3112
3113 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3114  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3115  * the stack.
3116  */
3117 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3118
3119 static void buf_to_pages(const void *buf, size_t buflen,
3120                 struct page **pages, unsigned int *pgbase)
3121 {
3122         const void *p = buf;
3123
3124         *pgbase = offset_in_page(buf);
3125         p -= *pgbase;
3126         while (p < buf + buflen) {
3127                 *(pages++) = virt_to_page(p);
3128                 p += PAGE_CACHE_SIZE;
3129         }
3130 }
3131
3132 struct nfs4_cached_acl {
3133         int cached;
3134         size_t len;
3135         char data[0];
3136 };
3137
3138 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3139 {
3140         struct nfs_inode *nfsi = NFS_I(inode);
3141
3142         spin_lock(&inode->i_lock);
3143         kfree(nfsi->nfs4_acl);
3144         nfsi->nfs4_acl = acl;
3145         spin_unlock(&inode->i_lock);
3146 }
3147
3148 static void nfs4_zap_acl_attr(struct inode *inode)
3149 {
3150         nfs4_set_cached_acl(inode, NULL);
3151 }
3152
3153 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3154 {
3155         struct nfs_inode *nfsi = NFS_I(inode);
3156         struct nfs4_cached_acl *acl;
3157         int ret = -ENOENT;
3158
3159         spin_lock(&inode->i_lock);
3160         acl = nfsi->nfs4_acl;
3161         if (acl == NULL)
3162                 goto out;
3163         if (buf == NULL) /* user is just asking for length */
3164                 goto out_len;
3165         if (acl->cached == 0)
3166                 goto out;
3167         ret = -ERANGE; /* see getxattr(2) man page */
3168         if (acl->len > buflen)
3169                 goto out;
3170         memcpy(buf, acl->data, acl->len);
3171 out_len:
3172         ret = acl->len;
3173 out:
3174         spin_unlock(&inode->i_lock);
3175         return ret;
3176 }
3177
3178 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
3179 {
3180         struct nfs4_cached_acl *acl;
3181
3182         if (buf && acl_len <= PAGE_SIZE) {
3183                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3184                 if (acl == NULL)
3185                         goto out;
3186                 acl->cached = 1;
3187                 memcpy(acl->data, buf, acl_len);
3188         } else {
3189                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3190                 if (acl == NULL)
3191                         goto out;
3192                 acl->cached = 0;
3193         }
3194         acl->len = acl_len;
3195 out:
3196         nfs4_set_cached_acl(inode, acl);
3197 }
3198
3199 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3200 {
3201         struct page *pages[NFS4ACL_MAXPAGES];
3202         struct nfs_getaclargs args = {
3203                 .fh = NFS_FH(inode),
3204                 .acl_pages = pages,
3205                 .acl_len = buflen,
3206         };
3207         struct nfs_getaclres res = {
3208                 .acl_len = buflen,
3209         };
3210         void *resp_buf;
3211         struct rpc_message msg = {
3212                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3213                 .rpc_argp = &args,
3214                 .rpc_resp = &res,
3215         };
3216         struct page *localpage = NULL;
3217         int ret;
3218
3219         if (buflen < PAGE_SIZE) {
3220                 /* As long as we're doing a round trip to the server anyway,
3221                  * let's be prepared for a page of acl data. */
3222                 localpage = alloc_page(GFP_KERNEL);
3223                 resp_buf = page_address(localpage);
3224                 if (localpage == NULL)
3225                         return -ENOMEM;
3226                 args.acl_pages[0] = localpage;
3227                 args.acl_pgbase = 0;
3228                 args.acl_len = PAGE_SIZE;
3229         } else {
3230                 resp_buf = buf;
3231                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
3232         }
3233         ret = nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
3234         if (ret)
3235                 goto out_free;
3236         if (res.acl_len > args.acl_len)
3237                 nfs4_write_cached_acl(inode, NULL, res.acl_len);
3238         else
3239                 nfs4_write_cached_acl(inode, resp_buf, res.acl_len);
3240         if (buf) {
3241                 ret = -ERANGE;
3242                 if (res.acl_len > buflen)
3243                         goto out_free;
3244                 if (localpage)
3245                         memcpy(buf, resp_buf, res.acl_len);
3246         }
3247         ret = res.acl_len;
3248 out_free:
3249         if (localpage)
3250                 __free_page(localpage);
3251         return ret;
3252 }
3253
3254 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3255 {
3256         struct nfs4_exception exception = { };
3257         ssize_t ret;
3258         do {
3259                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3260                 if (ret >= 0)
3261                         break;
3262                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3263         } while (exception.retry);
3264         return ret;
3265 }
3266
3267 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3268 {
3269         struct nfs_server *server = NFS_SERVER(inode);
3270         int ret;
3271
3272         if (!nfs4_server_supports_acls(server))
3273                 return -EOPNOTSUPP;
3274         ret = nfs_revalidate_inode(server, inode);
3275         if (ret < 0)
3276                 return ret;
3277         ret = nfs4_read_cached_acl(inode, buf, buflen);
3278         if (ret != -ENOENT)
3279                 return ret;
3280         return nfs4_get_acl_uncached(inode, buf, buflen);
3281 }
3282
3283 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3284 {
3285         struct nfs_server *server = NFS_SERVER(inode);
3286         struct page *pages[NFS4ACL_MAXPAGES];
3287         struct nfs_setaclargs arg = {
3288                 .fh             = NFS_FH(inode),
3289                 .acl_pages      = pages,
3290                 .acl_len        = buflen,
3291         };
3292         struct nfs_setaclres res;
3293         struct rpc_message msg = {
3294                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3295                 .rpc_argp       = &arg,
3296                 .rpc_resp       = &res,
3297         };
3298         int ret;
3299
3300         if (!nfs4_server_supports_acls(server))
3301                 return -EOPNOTSUPP;
3302         nfs_inode_return_delegation(inode);
3303         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3304         ret = nfs4_call_sync(server, &msg, &arg, &res, 1);
3305         nfs_access_zap_cache(inode);
3306         nfs_zap_acl_cache(inode);
3307         return ret;
3308 }
3309
3310 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3311 {
3312         struct nfs4_exception exception = { };
3313         int err;
3314         do {
3315                 err = nfs4_handle_exception(NFS_SERVER(inode),
3316                                 __nfs4_proc_set_acl(inode, buf, buflen),
3317                                 &exception);
3318         } while (exception.retry);
3319         return err;
3320 }
3321
3322 static int
3323 _nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs_client *clp, struct nfs4_state *state)
3324 {
3325         if (!clp || task->tk_status >= 0)
3326                 return 0;
3327         switch(task->tk_status) {
3328                 case -NFS4ERR_ADMIN_REVOKED:
3329                 case -NFS4ERR_BAD_STATEID:
3330                 case -NFS4ERR_OPENMODE:
3331                         if (state == NULL)
3332                                 break;
3333                         nfs4_state_mark_reclaim_nograce(clp, state);
3334                 case -NFS4ERR_STALE_CLIENTID:
3335                 case -NFS4ERR_STALE_STATEID:
3336                 case -NFS4ERR_EXPIRED:
3337                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3338                         nfs4_schedule_state_recovery(clp);
3339                         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3340                                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3341                         task->tk_status = 0;
3342                         return -EAGAIN;
3343 #if defined(CONFIG_NFS_V4_1)
3344                 case -NFS4ERR_BADSESSION:
3345                 case -NFS4ERR_BADSLOT:
3346                 case -NFS4ERR_BAD_HIGH_SLOT:
3347                 case -NFS4ERR_DEADSESSION:
3348                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3349                 case -NFS4ERR_SEQ_FALSE_RETRY:
3350                 case -NFS4ERR_SEQ_MISORDERED:
3351                         dprintk("%s ERROR %d, Reset session\n", __func__,
3352                                 task->tk_status);
3353                         set_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state);
3354                         task->tk_status = 0;
3355                         return -EAGAIN;
3356 #endif /* CONFIG_NFS_V4_1 */
3357                 case -NFS4ERR_DELAY:
3358                         if (server)
3359                                 nfs_inc_server_stats(server, NFSIOS_DELAY);
3360                 case -NFS4ERR_GRACE:
3361                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3362                         task->tk_status = 0;
3363                         return -EAGAIN;
3364                 case -NFS4ERR_OLD_STATEID:
3365                         task->tk_status = 0;
3366                         return -EAGAIN;
3367         }
3368         task->tk_status = nfs4_map_errors(task->tk_status);
3369         return 0;
3370 }
3371
3372 static int
3373 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3374 {
3375         return _nfs4_async_handle_error(task, server, server->nfs_client, state);
3376 }
3377
3378 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
3379 {
3380         nfs4_verifier sc_verifier;
3381         struct nfs4_setclientid setclientid = {
3382                 .sc_verifier = &sc_verifier,
3383                 .sc_prog = program,
3384         };
3385         struct rpc_message msg = {
3386                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3387                 .rpc_argp = &setclientid,
3388                 .rpc_resp = clp,
3389                 .rpc_cred = cred,
3390         };
3391         __be32 *p;
3392         int loop = 0;
3393         int status;
3394
3395         p = (__be32*)sc_verifier.data;
3396         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3397         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3398
3399         for(;;) {
3400                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3401                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3402                                 clp->cl_ipaddr,
3403                                 rpc_peeraddr2str(clp->cl_rpcclient,
3404                                                         RPC_DISPLAY_ADDR),
3405                                 rpc_peeraddr2str(clp->cl_rpcclient,
3406                                                         RPC_DISPLAY_PROTO),
3407                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3408                                 clp->cl_id_uniquifier);
3409                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3410                                 sizeof(setclientid.sc_netid),
3411                                 rpc_peeraddr2str(clp->cl_rpcclient,
3412                                                         RPC_DISPLAY_NETID));
3413                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3414                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3415                                 clp->cl_ipaddr, port >> 8, port & 255);
3416
3417                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3418                 if (status != -NFS4ERR_CLID_INUSE)
3419                         break;
3420                 if (signalled())
3421                         break;
3422                 if (loop++ & 1)
3423                         ssleep(clp->cl_lease_time + 1);
3424                 else
3425                         if (++clp->cl_id_uniquifier == 0)
3426                                 break;
3427         }
3428         return status;
3429 }
3430
3431 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
3432 {
3433         struct nfs_fsinfo fsinfo;
3434         struct rpc_message msg = {
3435                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3436                 .rpc_argp = clp,
3437                 .rpc_resp = &fsinfo,
3438                 .rpc_cred = cred,
3439         };
3440         unsigned long now;
3441         int status;
3442
3443         now = jiffies;
3444         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3445         if (status == 0) {
3446                 spin_lock(&clp->cl_lock);
3447                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3448                 clp->cl_last_renewal = now;
3449                 spin_unlock(&clp->cl_lock);
3450         }
3451         return status;
3452 }
3453
3454 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
3455 {
3456         long timeout = 0;
3457         int err;
3458         do {
3459                 err = _nfs4_proc_setclientid_confirm(clp, cred);
3460                 switch (err) {
3461                         case 0:
3462                                 return err;
3463                         case -NFS4ERR_RESOURCE:
3464                                 /* The IBM lawyers misread another document! */
3465                         case -NFS4ERR_DELAY:
3466                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
3467                 }
3468         } while (err == 0);
3469         return err;
3470 }
3471
3472 struct nfs4_delegreturndata {
3473         struct nfs4_delegreturnargs args;
3474         struct nfs4_delegreturnres res;
3475         struct nfs_fh fh;
3476         nfs4_stateid stateid;
3477         unsigned long timestamp;
3478         struct nfs_fattr fattr;
3479         int rpc_status;
3480 };
3481
3482 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3483 {
3484         struct nfs4_delegreturndata *data = calldata;
3485
3486         nfs4_sequence_done_free_slot(data->res.server, &data->res.seq_res,
3487                                      task->tk_status);
3488
3489         data->rpc_status = task->tk_status;
3490         if (data->rpc_status == 0)
3491                 renew_lease(data->res.server, data->timestamp);
3492 }
3493
3494 static void nfs4_delegreturn_release(void *calldata)
3495 {
3496         kfree(calldata);
3497 }
3498
3499 #if defined(CONFIG_NFS_V4_1)
3500 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3501 {
3502         struct nfs4_delegreturndata *d_data;
3503
3504         d_data = (struct nfs4_delegreturndata *)data;
3505
3506         if (nfs4_setup_sequence(d_data->res.server->nfs_client,
3507                                 &d_data->args.seq_args,
3508                                 &d_data->res.seq_res, 1, task))
3509                 return;
3510         rpc_call_start(task);
3511 }
3512 #endif /* CONFIG_NFS_V4_1 */
3513
3514 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3515 #if defined(CONFIG_NFS_V4_1)
3516         .rpc_call_prepare = nfs4_delegreturn_prepare,
3517 #endif /* CONFIG_NFS_V4_1 */
3518         .rpc_call_done = nfs4_delegreturn_done,
3519         .rpc_release = nfs4_delegreturn_release,
3520 };
3521
3522 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3523 {
3524         struct nfs4_delegreturndata *data;
3525         struct nfs_server *server = NFS_SERVER(inode);
3526         struct rpc_task *task;
3527         struct rpc_message msg = {
3528                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3529                 .rpc_cred = cred,
3530         };
3531         struct rpc_task_setup task_setup_data = {
3532                 .rpc_client = server->client,
3533                 .rpc_message = &msg,
3534                 .callback_ops = &nfs4_delegreturn_ops,
3535                 .flags = RPC_TASK_ASYNC,
3536         };
3537         int status = 0;
3538
3539         data = kzalloc(sizeof(*data), GFP_KERNEL);
3540         if (data == NULL)
3541                 return -ENOMEM;
3542         data->args.fhandle = &data->fh;
3543         data->args.stateid = &data->stateid;
3544         data->args.bitmask = server->attr_bitmask;
3545         nfs_copy_fh(&data->fh, NFS_FH(inode));
3546         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3547         data->res.fattr = &data->fattr;
3548         data->res.server = server;
3549         data->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3550         nfs_fattr_init(data->res.fattr);
3551         data->timestamp = jiffies;
3552         data->rpc_status = 0;
3553
3554         task_setup_data.callback_data = data;
3555         msg.rpc_argp = &data->args,
3556         msg.rpc_resp = &data->res,
3557         task = rpc_run_task(&task_setup_data);
3558         if (IS_ERR(task))
3559                 return PTR_ERR(task);
3560         if (!issync)
3561                 goto out;
3562         status = nfs4_wait_for_completion_rpc_task(task);
3563         if (status != 0)
3564                 goto out;
3565         status = data->rpc_status;
3566         if (status != 0)
3567                 goto out;
3568         nfs_refresh_inode(inode, &data->fattr);
3569 out:
3570         rpc_put_task(task);
3571         return status;
3572 }
3573
3574 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3575 {
3576         struct nfs_server *server = NFS_SERVER(inode);
3577         struct nfs4_exception exception = { };
3578         int err;
3579         do {
3580                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3581                 switch (err) {
3582                         case -NFS4ERR_STALE_STATEID:
3583                         case -NFS4ERR_EXPIRED:
3584                         case 0:
3585                                 return 0;
3586                 }
3587                 err = nfs4_handle_exception(server, err, &exception);
3588         } while (exception.retry);
3589         return err;
3590 }
3591
3592 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3593 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3594
3595 /* 
3596  * sleep, with exponential backoff, and retry the LOCK operation. 
3597  */
3598 static unsigned long
3599 nfs4_set_lock_task_retry(unsigned long timeout)
3600 {
3601         schedule_timeout_killable(timeout);
3602         timeout <<= 1;
3603         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3604                 return NFS4_LOCK_MAXTIMEOUT;
3605         return timeout;
3606 }
3607
3608 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3609 {
3610         struct inode *inode = state->inode;
3611         struct nfs_server *server = NFS_SERVER(inode);
3612         struct nfs_client *clp = server->nfs_client;
3613         struct nfs_lockt_args arg = {
3614                 .fh = NFS_FH(inode),
3615                 .fl = request,
3616         };
3617         struct nfs_lockt_res res = {
3618                 .denied = request,
3619         };
3620         struct rpc_message msg = {
3621                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3622                 .rpc_argp       = &arg,
3623                 .rpc_resp       = &res,
3624                 .rpc_cred       = state->owner->so_cred,
3625         };
3626         struct nfs4_lock_state *lsp;
3627         int status;
3628
3629         arg.lock_owner.clientid = clp->cl_clientid;
3630         status = nfs4_set_lock_state(state, request);
3631         if (status != 0)
3632                 goto out;
3633         lsp = request->fl_u.nfs4_fl.owner;
3634         arg.lock_owner.id = lsp->ls_id.id;
3635         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
3636         switch (status) {
3637                 case 0:
3638                         request->fl_type = F_UNLCK;
3639                         break;
3640                 case -NFS4ERR_DENIED:
3641                         status = 0;
3642         }
3643         request->fl_ops->fl_release_private(request);
3644 out:
3645         return status;
3646 }
3647
3648 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3649 {
3650         struct nfs4_exception exception = { };
3651         int err;
3652
3653         do {
3654                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3655                                 _nfs4_proc_getlk(state, cmd, request),
3656                                 &exception);
3657         } while (exception.retry);
3658         return err;
3659 }
3660
3661 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3662 {
3663         int res = 0;
3664         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3665                 case FL_POSIX:
3666                         res = posix_lock_file_wait(file, fl);
3667                         break;
3668                 case FL_FLOCK:
3669                         res = flock_lock_file_wait(file, fl);
3670                         break;
3671                 default:
3672                         BUG();
3673         }
3674         return res;
3675 }
3676
3677 struct nfs4_unlockdata {
3678         struct nfs_locku_args arg;
3679         struct nfs_locku_res res;
3680         struct nfs4_lock_state *lsp;
3681         struct nfs_open_context *ctx;
3682         struct file_lock fl;
3683         const struct nfs_server *server;
3684         unsigned long timestamp;
3685 };
3686
3687 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3688                 struct nfs_open_context *ctx,
3689                 struct nfs4_lock_state *lsp,
3690                 struct nfs_seqid *seqid)
3691 {
3692         struct nfs4_unlockdata *p;
3693         struct inode *inode = lsp->ls_state->inode;
3694
3695         p = kzalloc(sizeof(*p), GFP_KERNEL);
3696         if (p == NULL)
3697                 return NULL;
3698         p->arg.fh = NFS_FH(inode);
3699         p->arg.fl = &p->fl;
3700         p->arg.seqid = seqid;
3701         p->res.seqid = seqid;
3702         p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3703         p->arg.stateid = &lsp->ls_stateid;
3704         p->lsp = lsp;
3705         atomic_inc(&lsp->ls_count);
3706         /* Ensure we don't close file until we're done freeing locks! */
3707         p->ctx = get_nfs_open_context(ctx);
3708         memcpy(&p->fl, fl, sizeof(p->fl));
3709         p->server = NFS_SERVER(inode);
3710         return p;
3711 }
3712
3713 static void nfs4_locku_release_calldata(void *data)
3714 {
3715         struct nfs4_unlockdata *calldata = data;
3716         nfs_free_seqid(calldata->arg.seqid);
3717         nfs4_put_lock_state(calldata->lsp);
3718         put_nfs_open_context(calldata->ctx);
3719         kfree(calldata);
3720 }
3721
3722 static void nfs4_locku_done(struct rpc_task *task, void *data)
3723 {
3724         struct nfs4_unlockdata *calldata = data;
3725
3726         nfs4_sequence_done(calldata->server, &calldata->res.seq_res,
3727                            task->tk_status);
3728         if (RPC_ASSASSINATED(task))
3729                 return;
3730         switch (task->tk_status) {
3731                 case 0:
3732                         memcpy(calldata->lsp->ls_stateid.data,
3733                                         calldata->res.stateid.data,
3734                                         sizeof(calldata->lsp->ls_stateid.data));
3735                         renew_lease(calldata->server, calldata->timestamp);
3736                         break;
3737                 case -NFS4ERR_BAD_STATEID:
3738                 case -NFS4ERR_OLD_STATEID:
3739                 case -NFS4ERR_STALE_STATEID:
3740                 case -NFS4ERR_EXPIRED:
3741                         break;
3742                 default:
3743                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
3744                                 nfs4_restart_rpc(task,
3745                                                 calldata->server->nfs_client);
3746         }
3747         nfs4_sequence_free_slot(calldata->server->nfs_client,
3748                                 &calldata->res.seq_res);
3749 }
3750
3751 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3752 {
3753         struct nfs4_unlockdata *calldata = data;
3754
3755         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3756                 return;
3757         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3758                 /* Note: exit _without_ running nfs4_locku_done */
3759                 task->tk_action = NULL;
3760                 return;
3761         }
3762         calldata->timestamp = jiffies;
3763         if (nfs4_setup_sequence(calldata->server->nfs_client,
3764                                 &calldata->arg.seq_args,
3765                                 &calldata->res.seq_res, 1, task))
3766                 return;
3767         rpc_call_start(task);
3768 }
3769
3770 static const struct rpc_call_ops nfs4_locku_ops = {
3771         .rpc_call_prepare = nfs4_locku_prepare,
3772         .rpc_call_done = nfs4_locku_done,
3773         .rpc_release = nfs4_locku_release_calldata,
3774 };
3775
3776 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3777                 struct nfs_open_context *ctx,
3778                 struct nfs4_lock_state *lsp,
3779                 struct nfs_seqid *seqid)
3780 {
3781         struct nfs4_unlockdata *data;
3782         struct rpc_message msg = {
3783                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3784                 .rpc_cred = ctx->cred,
3785         };
3786         struct rpc_task_setup task_setup_data = {
3787                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
3788                 .rpc_message = &msg,
3789                 .callback_ops = &nfs4_locku_ops,
3790                 .workqueue = nfsiod_workqueue,
3791                 .flags = RPC_TASK_ASYNC,
3792         };
3793
3794         /* Ensure this is an unlock - when canceling a lock, the
3795          * canceled lock is passed in, and it won't be an unlock.
3796          */
3797         fl->fl_type = F_UNLCK;
3798
3799         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3800         if (data == NULL) {
3801                 nfs_free_seqid(seqid);
3802                 return ERR_PTR(-ENOMEM);
3803         }
3804
3805         msg.rpc_argp = &data->arg,
3806         msg.rpc_resp = &data->res,
3807         task_setup_data.callback_data = data;
3808         return rpc_run_task(&task_setup_data);
3809 }
3810
3811 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3812 {
3813         struct nfs_inode *nfsi = NFS_I(state->inode);
3814         struct nfs_seqid *seqid;
3815         struct nfs4_lock_state *lsp;
3816         struct rpc_task *task;
3817         int status = 0;
3818         unsigned char fl_flags = request->fl_flags;
3819
3820         status = nfs4_set_lock_state(state, request);
3821         /* Unlock _before_ we do the RPC call */
3822         request->fl_flags |= FL_EXISTS;
3823         down_read(&nfsi->rwsem);
3824         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
3825                 up_read(&nfsi->rwsem);
3826                 goto out;
3827         }
3828         up_read(&nfsi->rwsem);
3829         if (status != 0)
3830                 goto out;
3831         /* Is this a delegated lock? */
3832         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3833                 goto out;
3834         lsp = request->fl_u.nfs4_fl.owner;
3835         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3836         status = -ENOMEM;
3837         if (seqid == NULL)
3838                 goto out;
3839         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
3840         status = PTR_ERR(task);
3841         if (IS_ERR(task))
3842                 goto out;
3843         status = nfs4_wait_for_completion_rpc_task(task);
3844         rpc_put_task(task);
3845 out:
3846         request->fl_flags = fl_flags;
3847         return status;
3848 }
3849
3850 struct nfs4_lockdata {
3851         struct nfs_lock_args arg;
3852         struct nfs_lock_res res;
3853         struct nfs4_lock_state *lsp;
3854         struct nfs_open_context *ctx;
3855         struct file_lock fl;
3856         unsigned long timestamp;
3857         int rpc_status;
3858         int cancelled;
3859         struct nfs_server *server;
3860 };
3861
3862 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3863                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3864 {
3865         struct nfs4_lockdata *p;
3866         struct inode *inode = lsp->ls_state->inode;
3867         struct nfs_server *server = NFS_SERVER(inode);
3868
3869         p = kzalloc(sizeof(*p), GFP_KERNEL);
3870         if (p == NULL)
3871                 return NULL;
3872
3873         p->arg.fh = NFS_FH(inode);
3874         p->arg.fl = &p->fl;
3875         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid);
3876         if (p->arg.open_seqid == NULL)
3877                 goto out_free;
3878         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3879         if (p->arg.lock_seqid == NULL)
3880                 goto out_free_seqid;
3881         p->arg.lock_stateid = &lsp->ls_stateid;
3882         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3883         p->arg.lock_owner.id = lsp->ls_id.id;
3884         p->res.lock_seqid = p->arg.lock_seqid;
3885         p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3886         p->lsp = lsp;
3887         p->server = server;
3888         atomic_inc(&lsp->ls_count);
3889         p->ctx = get_nfs_open_context(ctx);
3890         memcpy(&p->fl, fl, sizeof(p->fl));
3891         return p;
3892 out_free_seqid:
3893         nfs_free_seqid(p->arg.open_seqid);
3894 out_free:
3895         kfree(p);
3896         return NULL;
3897 }
3898
3899 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3900 {
3901         struct nfs4_lockdata *data = calldata;
3902         struct nfs4_state *state = data->lsp->ls_state;
3903
3904         dprintk("%s: begin!\n", __func__);
3905         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3906                 return;
3907         /* Do we need to do an open_to_lock_owner? */
3908         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3909                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
3910                         return;
3911                 data->arg.open_stateid = &state->stateid;
3912                 data->arg.new_lock_owner = 1;
3913                 data->res.open_seqid = data->arg.open_seqid;
3914         } else
3915                 data->arg.new_lock_owner = 0;
3916         data->timestamp = jiffies;
3917         if (nfs4_setup_sequence(data->server->nfs_client, &data->arg.seq_args,
3918                                 &data->res.seq_res, 1, task))
3919                 return;
3920         rpc_call_start(task);
3921         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
3922 }
3923
3924 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3925 {
3926         struct nfs4_lockdata *data = calldata;
3927
3928         dprintk("%s: begin!\n", __func__);
3929
3930         nfs4_sequence_done_free_slot(data->server, &data->res.seq_res,
3931                                      task->tk_status);
3932
3933         data->rpc_status = task->tk_status;
3934         if (RPC_ASSASSINATED(task))
3935                 goto out;
3936         if (data->arg.new_lock_owner != 0) {
3937                 if (data->rpc_status == 0)
3938                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3939                 else
3940                         goto out;
3941         }
3942         if (data->rpc_status == 0) {
3943                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3944                                         sizeof(data->lsp->ls_stateid.data));
3945                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3946                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
3947         }
3948 out:
3949         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
3950 }
3951
3952 static void nfs4_lock_release(void *calldata)
3953 {
3954         struct nfs4_lockdata *data = calldata;
3955
3956         dprintk("%s: begin!\n", __func__);
3957         nfs_free_seqid(data->arg.open_seqid);
3958         if (data->cancelled != 0) {
3959                 struct rpc_task *task;
3960                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3961                                 data->arg.lock_seqid);
3962                 if (!IS_ERR(task))
3963                         rpc_put_task(task);
3964                 dprintk("%s: cancelling lock!\n", __func__);
3965         } else
3966                 nfs_free_seqid(data->arg.lock_seqid);
3967         nfs4_put_lock_state(data->lsp);
3968         put_nfs_open_context(data->ctx);
3969         kfree(data);
3970         dprintk("%s: done!\n", __func__);
3971 }
3972
3973 static const struct rpc_call_ops nfs4_lock_ops = {
3974         .rpc_call_prepare = nfs4_lock_prepare,
3975         .rpc_call_done = nfs4_lock_done,
3976         .rpc_release = nfs4_lock_release,
3977 };
3978
3979 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3980 {
3981         struct nfs4_lockdata *data;
3982         struct rpc_task *task;
3983         struct rpc_message msg = {
3984                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3985                 .rpc_cred = state->owner->so_cred,
3986         };
3987         struct rpc_task_setup task_setup_data = {
3988                 .rpc_client = NFS_CLIENT(state->inode),
3989                 .rpc_message = &msg,
3990                 .callback_ops = &nfs4_lock_ops,
3991                 .workqueue = nfsiod_workqueue,
3992                 .flags = RPC_TASK_ASYNC,
3993         };
3994         int ret;
3995
3996         dprintk("%s: begin!\n", __func__);
3997         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
3998                         fl->fl_u.nfs4_fl.owner);
3999         if (data == NULL)
4000                 return -ENOMEM;
4001         if (IS_SETLKW(cmd))
4002                 data->arg.block = 1;
4003         if (reclaim != 0)
4004                 data->arg.reclaim = 1;
4005         msg.rpc_argp = &data->arg,
4006         msg.rpc_resp = &data->res,
4007         task_setup_data.callback_data = data;
4008         task = rpc_run_task(&task_setup_data);
4009         if (IS_ERR(task))
4010                 return PTR_ERR(task);
4011         ret = nfs4_wait_for_completion_rpc_task(task);
4012         if (ret == 0) {
4013                 ret = data->rpc_status;
4014         } else
4015                 data->cancelled = 1;
4016         rpc_put_task(task);
4017         dprintk("%s: done, ret = %d!\n", __func__, ret);
4018         return ret;
4019 }
4020
4021 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4022 {
4023         struct nfs_server *server = NFS_SERVER(state->inode);
4024         struct nfs4_exception exception = { };
4025         int err;
4026
4027         do {
4028                 /* Cache the lock if possible... */
4029                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4030                         return 0;
4031                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
4032                 if (err != -NFS4ERR_DELAY)
4033                         break;
4034                 nfs4_handle_exception(server, err, &exception);
4035         } while (exception.retry);
4036         return err;
4037 }
4038
4039 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4040 {
4041         struct nfs_server *server = NFS_SERVER(state->inode);
4042         struct nfs4_exception exception = { };
4043         int err;
4044
4045         err = nfs4_set_lock_state(state, request);
4046         if (err != 0)
4047                 return err;
4048         do {
4049                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4050                         return 0;
4051                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
4052                 if (err != -NFS4ERR_DELAY)
4053                         break;
4054                 nfs4_handle_exception(server, err, &exception);
4055         } while (exception.retry);
4056         return err;
4057 }
4058
4059 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4060 {
4061         struct nfs_inode *nfsi = NFS_I(state->inode);
4062         unsigned char fl_flags = request->fl_flags;
4063         int status;
4064
4065         /* Is this a delegated open? */
4066         status = nfs4_set_lock_state(state, request);
4067         if (status != 0)
4068                 goto out;
4069         request->fl_flags |= FL_ACCESS;
4070         status = do_vfs_lock(request->fl_file, request);
4071         if (status < 0)
4072                 goto out;
4073         down_read(&nfsi->rwsem);
4074         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4075                 /* Yes: cache locks! */
4076                 /* ...but avoid races with delegation recall... */
4077                 request->fl_flags = fl_flags & ~FL_SLEEP;
4078                 status = do_vfs_lock(request->fl_file, request);
4079                 goto out_unlock;
4080         }
4081         status = _nfs4_do_setlk(state, cmd, request, 0);
4082         if (status != 0)
4083                 goto out_unlock;
4084         /* Note: we always want to sleep here! */
4085         request->fl_flags = fl_flags | FL_SLEEP;
4086         if (do_vfs_lock(request->fl_file, request) < 0)
4087                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4088 out_unlock:
4089         up_read(&nfsi->rwsem);
4090 out:
4091         request->fl_flags = fl_flags;
4092         return status;
4093 }
4094
4095 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4096 {
4097         struct nfs4_exception exception = { };
4098         int err;
4099
4100         do {
4101                 err = _nfs4_proc_setlk(state, cmd, request);
4102                 if (err == -NFS4ERR_DENIED)
4103                         err = -EAGAIN;
4104                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4105                                 err, &exception);
4106         } while (exception.retry);
4107         return err;
4108 }
4109
4110 static int
4111 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4112 {
4113         struct nfs_open_context *ctx;
4114         struct nfs4_state *state;
4115         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4116         int status;
4117
4118         /* verify open state */
4119         ctx = nfs_file_open_context(filp);
4120         state = ctx->state;
4121
4122         if (request->fl_start < 0 || request->fl_end < 0)
4123                 return -EINVAL;
4124
4125         if (IS_GETLK(cmd)) {
4126                 if (state != NULL)
4127                         return nfs4_proc_getlk(state, F_GETLK, request);
4128                 return 0;
4129         }
4130
4131         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4132                 return -EINVAL;
4133
4134         if (request->fl_type == F_UNLCK) {
4135                 if (state != NULL)
4136                         return nfs4_proc_unlck(state, cmd, request);
4137                 return 0;
4138         }
4139
4140         if (state == NULL)
4141                 return -ENOLCK;
4142         do {
4143                 status = nfs4_proc_setlk(state, cmd, request);
4144                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4145                         break;
4146                 timeout = nfs4_set_lock_task_retry(timeout);
4147                 status = -ERESTARTSYS;
4148                 if (signalled())
4149                         break;
4150         } while(status < 0);
4151         return status;
4152 }
4153
4154 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4155 {
4156         struct nfs_server *server = NFS_SERVER(state->inode);
4157         struct nfs4_exception exception = { };
4158         int err;
4159
4160         err = nfs4_set_lock_state(state, fl);
4161         if (err != 0)
4162                 goto out;
4163         do {
4164                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
4165                 switch (err) {
4166                         default:
4167                                 printk(KERN_ERR "%s: unhandled error %d.\n",
4168                                                 __func__, err);
4169                         case 0:
4170                         case -ESTALE:
4171                                 goto out;
4172                         case -NFS4ERR_EXPIRED:
4173                         case -NFS4ERR_STALE_CLIENTID:
4174                         case -NFS4ERR_STALE_STATEID:
4175                                 nfs4_schedule_state_recovery(server->nfs_client);
4176                                 goto out;
4177                         case -ERESTARTSYS:
4178                                 /*
4179                                  * The show must go on: exit, but mark the
4180                                  * stateid as needing recovery.
4181                                  */
4182                         case -NFS4ERR_ADMIN_REVOKED:
4183                         case -NFS4ERR_BAD_STATEID:
4184                         case -NFS4ERR_OPENMODE:
4185                                 nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
4186                                 err = 0;
4187                                 goto out;
4188                         case -ENOMEM:
4189                         case -NFS4ERR_DENIED:
4190                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4191                                 err = 0;
4192                                 goto out;
4193                         case -NFS4ERR_DELAY:
4194                                 break;
4195                 }
4196                 err = nfs4_handle_exception(server, err, &exception);
4197         } while (exception.retry);
4198 out:
4199         return err;
4200 }
4201
4202 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4203
4204 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
4205                 size_t buflen, int flags)
4206 {
4207         struct inode *inode = dentry->d_inode;
4208
4209         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
4210                 return -EOPNOTSUPP;
4211
4212         return nfs4_proc_set_acl(inode, buf, buflen);
4213 }
4214
4215 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
4216  * and that's what we'll do for e.g. user attributes that haven't been set.
4217  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
4218  * attributes in kernel-managed attribute namespaces. */
4219 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
4220                 size_t buflen)
4221 {
4222         struct inode *inode = dentry->d_inode;
4223
4224         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
4225                 return -EOPNOTSUPP;
4226
4227         return nfs4_proc_get_acl(inode, buf, buflen);
4228 }
4229
4230 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
4231 {
4232         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
4233
4234         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4235                 return 0;
4236         if (buf && buflen < len)
4237                 return -ERANGE;
4238         if (buf)
4239                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
4240         return len;
4241 }
4242
4243 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4244 {
4245         if (!((fattr->valid & NFS_ATTR_FATTR_FILEID) &&
4246                 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4247                 (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4248                 return;
4249
4250         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4251                 NFS_ATTR_FATTR_NLINK;
4252         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4253         fattr->nlink = 2;
4254 }
4255
4256 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4257                 struct nfs4_fs_locations *fs_locations, struct page *page)
4258 {
4259         struct nfs_server *server = NFS_SERVER(dir);
4260         u32 bitmask[2] = {
4261                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4262                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
4263         };
4264         struct nfs4_fs_locations_arg args = {
4265                 .dir_fh = NFS_FH(dir),
4266                 .name = name,
4267                 .page = page,
4268                 .bitmask = bitmask,
4269         };
4270         struct nfs4_fs_locations_res res = {
4271                 .fs_locations = fs_locations,
4272         };
4273         struct rpc_message msg = {
4274                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4275                 .rpc_argp = &args,
4276                 .rpc_resp = &res,
4277         };
4278         int status;
4279
4280         dprintk("%s: start\n", __func__);
4281         nfs_fattr_init(&fs_locations->fattr);
4282         fs_locations->server = server;
4283         fs_locations->nlocations = 0;
4284         status = nfs4_call_sync(server, &msg, &args, &res, 0);
4285         nfs_fixup_referral_attributes(&fs_locations->fattr);
4286         dprintk("%s: returned status = %d\n", __func__, status);
4287         return status;
4288 }
4289
4290 #ifdef CONFIG_NFS_V4_1
4291 /*
4292  * nfs4_proc_exchange_id()
4293  *
4294  * Since the clientid has expired, all compounds using sessions
4295  * associated with the stale clientid will be returning
4296  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4297  * be in some phase of session reset.
4298  */
4299 static int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4300 {
4301         nfs4_verifier verifier;
4302         struct nfs41_exchange_id_args args = {
4303                 .client = clp,
4304                 .flags = clp->cl_exchange_flags,
4305         };
4306         struct nfs41_exchange_id_res res = {
4307                 .client = clp,
4308         };
4309         int status;
4310         struct rpc_message msg = {
4311                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4312                 .rpc_argp = &args,
4313                 .rpc_resp = &res,
4314                 .rpc_cred = cred,
4315         };
4316         __be32 *p;
4317
4318         dprintk("--> %s\n", __func__);
4319         BUG_ON(clp == NULL);
4320
4321         p = (u32 *)verifier.data;
4322         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4323         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
4324         args.verifier = &verifier;
4325
4326         while (1) {
4327                 args.id_len = scnprintf(args.id, sizeof(args.id),
4328                                         "%s/%s %u",
4329                                         clp->cl_ipaddr,
4330                                         rpc_peeraddr2str(clp->cl_rpcclient,
4331                                                          RPC_DISPLAY_ADDR),
4332                                         clp->cl_id_uniquifier);
4333
4334                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
4335
4336                 if (status != NFS4ERR_CLID_INUSE)
4337                         break;
4338
4339                 if (signalled())
4340                         break;
4341
4342                 if (++clp->cl_id_uniquifier == 0)
4343                         break;
4344         }
4345
4346         dprintk("<-- %s status= %d\n", __func__, status);
4347         return status;
4348 }
4349
4350 struct nfs4_get_lease_time_data {
4351         struct nfs4_get_lease_time_args *args;
4352         struct nfs4_get_lease_time_res *res;
4353         struct nfs_client *clp;
4354 };
4355
4356 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
4357                                         void *calldata)
4358 {
4359         int ret;
4360         struct nfs4_get_lease_time_data *data =
4361                         (struct nfs4_get_lease_time_data *)calldata;
4362
4363         dprintk("--> %s\n", __func__);
4364         /* just setup sequence, do not trigger session recovery
4365            since we're invoked within one */
4366         ret = nfs41_setup_sequence(data->clp->cl_session,
4367                                         &data->args->la_seq_args,
4368                                         &data->res->lr_seq_res, 0, task);
4369
4370         BUG_ON(ret == -EAGAIN);
4371         rpc_call_start(task);
4372         dprintk("<-- %s\n", __func__);
4373 }
4374
4375 /*
4376  * Called from nfs4_state_manager thread for session setup, so don't recover
4377  * from sequence operation or clientid errors.
4378  */
4379 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
4380 {
4381         struct nfs4_get_lease_time_data *data =
4382                         (struct nfs4_get_lease_time_data *)calldata;
4383
4384         dprintk("--> %s\n", __func__);
4385         nfs41_sequence_done(data->clp, &data->res->lr_seq_res, task->tk_status);
4386         switch (task->tk_status) {
4387         case -NFS4ERR_DELAY:
4388         case -NFS4ERR_GRACE:
4389                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
4390                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
4391                 task->tk_status = 0;
4392                 nfs4_restart_rpc(task, data->clp);
4393                 return;
4394         }
4395         nfs41_sequence_free_slot(data->clp, &data->res->lr_seq_res);
4396         dprintk("<-- %s\n", __func__);
4397 }
4398
4399 struct rpc_call_ops nfs4_get_lease_time_ops = {
4400         .rpc_call_prepare = nfs4_get_lease_time_prepare,
4401         .rpc_call_done = nfs4_get_lease_time_done,
4402 };
4403
4404 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
4405 {
4406         struct rpc_task *task;
4407         struct nfs4_get_lease_time_args args;
4408         struct nfs4_get_lease_time_res res = {
4409                 .lr_fsinfo = fsinfo,
4410         };
4411         struct nfs4_get_lease_time_data data = {
4412                 .args = &args,
4413                 .res = &res,
4414                 .clp = clp,
4415         };
4416         struct rpc_message msg = {
4417                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
4418                 .rpc_argp = &args,
4419                 .rpc_resp = &res,
4420         };
4421         struct rpc_task_setup task_setup = {
4422                 .rpc_client = clp->cl_rpcclient,
4423                 .rpc_message = &msg,
4424                 .callback_ops = &nfs4_get_lease_time_ops,
4425                 .callback_data = &data
4426         };
4427         int status;
4428
4429         res.lr_seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
4430         dprintk("--> %s\n", __func__);
4431         task = rpc_run_task(&task_setup);
4432
4433         if (IS_ERR(task))
4434                 status = PTR_ERR(task);
4435         else {
4436                 status = task->tk_status;
4437                 rpc_put_task(task);
4438         }
4439         dprintk("<-- %s return %d\n", __func__, status);
4440
4441         return status;
4442 }
4443
4444 /*
4445  * Reset a slot table
4446  */
4447 static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, int max_slots,
4448                 int old_max_slots, int ivalue)
4449 {
4450         int i;
4451         int ret = 0;
4452
4453         dprintk("--> %s: max_reqs=%u, tbl %p\n", __func__, max_slots, tbl);
4454
4455         /*
4456          * Until we have dynamic slot table adjustment, insist
4457          * upon the same slot table size
4458          */
4459         if (max_slots != old_max_slots) {
4460                 dprintk("%s reset slot table does't match old\n",
4461                         __func__);
4462                 ret = -EINVAL; /*XXX NFS4ERR_REQ_TOO_BIG ? */
4463                 goto out;
4464         }
4465         spin_lock(&tbl->slot_tbl_lock);
4466         for (i = 0; i < max_slots; ++i)
4467                 tbl->slots[i].seq_nr = ivalue;
4468         tbl->highest_used_slotid = -1;
4469         spin_unlock(&tbl->slot_tbl_lock);
4470         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4471                 tbl, tbl->slots, tbl->max_slots);
4472 out:
4473         dprintk("<-- %s: return %d\n", __func__, ret);
4474         return ret;
4475 }
4476
4477 /*
4478  * Reset the forechannel and backchannel slot tables
4479  */
4480 static int nfs4_reset_slot_tables(struct nfs4_session *session)
4481 {
4482         int status;
4483
4484         status = nfs4_reset_slot_table(&session->fc_slot_table,
4485                         session->fc_attrs.max_reqs,
4486                         session->fc_slot_table.max_slots,
4487                         1);
4488         if (status)
4489                 return status;
4490
4491         status = nfs4_reset_slot_table(&session->bc_slot_table,
4492                         session->bc_attrs.max_reqs,
4493                         session->bc_slot_table.max_slots,
4494                         0);
4495         return status;
4496 }
4497
4498 /* Destroy the slot table */
4499 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
4500 {
4501         if (session->fc_slot_table.slots != NULL) {
4502                 kfree(session->fc_slot_table.slots);
4503                 session->fc_slot_table.slots = NULL;
4504         }
4505         if (session->bc_slot_table.slots != NULL) {
4506                 kfree(session->bc_slot_table.slots);
4507                 session->bc_slot_table.slots = NULL;
4508         }
4509         return;
4510 }
4511
4512 /*
4513  * Initialize slot table
4514  */
4515 static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
4516                 int max_slots, int ivalue)
4517 {
4518         int i;
4519         struct nfs4_slot *slot;
4520         int ret = -ENOMEM;
4521
4522         BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);
4523
4524         dprintk("--> %s: max_reqs=%u\n", __func__, max_slots);
4525
4526         slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_KERNEL);
4527         if (!slot)
4528                 goto out;
4529         for (i = 0; i < max_slots; ++i)
4530                 slot[i].seq_nr = ivalue;
4531         ret = 0;
4532
4533         spin_lock(&tbl->slot_tbl_lock);
4534         if (tbl->slots != NULL) {
4535                 spin_unlock(&tbl->slot_tbl_lock);
4536                 dprintk("%s: slot table already initialized. tbl=%p slots=%p\n",
4537                         __func__, tbl, tbl->slots);
4538                 WARN_ON(1);
4539                 goto out_free;
4540         }
4541         tbl->max_slots = max_slots;
4542         tbl->slots = slot;
4543         tbl->highest_used_slotid = -1;  /* no slot is currently used */
4544         spin_unlock(&tbl->slot_tbl_lock);
4545         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4546                 tbl, tbl->slots, tbl->max_slots);
4547 out:
4548         dprintk("<-- %s: return %d\n", __func__, ret);
4549         return ret;
4550
4551 out_free:
4552         kfree(slot);
4553         goto out;
4554 }
4555
4556 /*
4557  * Initialize the forechannel and backchannel tables
4558  */
4559 static int nfs4_init_slot_tables(struct nfs4_session *session)
4560 {
4561         int status;
4562
4563         status = nfs4_init_slot_table(&session->fc_slot_table,
4564                         session->fc_attrs.max_reqs, 1);
4565         if (status)
4566                 return status;
4567
4568         status = nfs4_init_slot_table(&session->bc_slot_table,
4569                         session->bc_attrs.max_reqs, 0);
4570         if (status)
4571                 nfs4_destroy_slot_tables(session);
4572
4573         return status;
4574 }
4575
4576 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
4577 {
4578         struct nfs4_session *session;
4579         struct nfs4_slot_table *tbl;
4580
4581         session = kzalloc(sizeof(struct nfs4_session), GFP_KERNEL);
4582         if (!session)
4583                 return NULL;
4584
4585         set_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state);
4586         /*
4587          * The create session reply races with the server back
4588          * channel probe. Mark the client NFS_CS_SESSION_INITING
4589          * so that the client back channel can find the
4590          * nfs_client struct
4591          */
4592         clp->cl_cons_state = NFS_CS_SESSION_INITING;
4593
4594         tbl = &session->fc_slot_table;
4595         spin_lock_init(&tbl->slot_tbl_lock);
4596         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
4597
4598         tbl = &session->bc_slot_table;
4599         spin_lock_init(&tbl->slot_tbl_lock);
4600         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
4601
4602         session->clp = clp;
4603         return session;
4604 }
4605
4606 void nfs4_destroy_session(struct nfs4_session *session)
4607 {
4608         nfs4_proc_destroy_session(session);
4609         dprintk("%s Destroy backchannel for xprt %p\n",
4610                 __func__, session->clp->cl_rpcclient->cl_xprt);
4611         xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
4612                                 NFS41_BC_MIN_CALLBACKS);
4613         nfs4_destroy_slot_tables(session);
4614         kfree(session);
4615 }
4616
4617 /*
4618  * Initialize the values to be used by the client in CREATE_SESSION
4619  * If nfs4_init_session set the fore channel request and response sizes,
4620  * use them.
4621  *
4622  * Set the back channel max_resp_sz_cached to zero to force the client to
4623  * always set csa_cachethis to FALSE because the current implementation
4624  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
4625  */
4626 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
4627 {
4628         struct nfs4_session *session = args->client->cl_session;
4629         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
4630                      mxresp_sz = session->fc_attrs.max_resp_sz;
4631
4632         if (mxrqst_sz == 0)
4633                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
4634         if (mxresp_sz == 0)
4635                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
4636         /* Fore channel attributes */
4637         args->fc_attrs.headerpadsz = 0;
4638         args->fc_attrs.max_rqst_sz = mxrqst_sz;
4639         args->fc_attrs.max_resp_sz = mxresp_sz;
4640         args->fc_attrs.max_resp_sz_cached = mxresp_sz;
4641         args->fc_attrs.max_ops = NFS4_MAX_OPS;
4642         args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;
4643
4644         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
4645                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
4646                 __func__,
4647                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
4648                 args->fc_attrs.max_resp_sz_cached, args->fc_attrs.max_ops,
4649                 args->fc_attrs.max_reqs);
4650
4651         /* Back channel attributes */
4652         args->bc_attrs.headerpadsz = 0;
4653         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
4654         args->bc_attrs.max_resp_sz = PAGE_SIZE;
4655         args->bc_attrs.max_resp_sz_cached = 0;
4656         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
4657         args->bc_attrs.max_reqs = 1;
4658
4659         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
4660                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
4661                 __func__,
4662                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
4663                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
4664                 args->bc_attrs.max_reqs);
4665 }
4666
4667 static int _verify_channel_attr(char *chan, char *attr_name, u32 sent, u32 rcvd)
4668 {
4669         if (rcvd <= sent)
4670                 return 0;
4671         printk(KERN_WARNING "%s: Session INVALID: %s channel %s increased. "
4672                 "sent=%u rcvd=%u\n", __func__, chan, attr_name, sent, rcvd);
4673         return -EINVAL;
4674 }
4675
4676 #define _verify_fore_channel_attr(_name_) \
4677         _verify_channel_attr("fore", #_name_, \
4678                              args->fc_attrs._name_, \
4679                              session->fc_attrs._name_)
4680
4681 #define _verify_back_channel_attr(_name_) \
4682         _verify_channel_attr("back", #_name_, \
4683                              args->bc_attrs._name_, \
4684                              session->bc_attrs._name_)
4685
4686 /*
4687  * The server is not allowed to increase the fore channel header pad size,
4688  * maximum response size, or maximum number of operations.
4689  *
4690  * The back channel attributes are only negotiatied down: We send what the
4691  * (back channel) server insists upon.
4692  */
4693 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
4694                                      struct nfs4_session *session)
4695 {
4696         int ret = 0;
4697
4698         ret |= _verify_fore_channel_attr(headerpadsz);
4699         ret |= _verify_fore_channel_attr(max_resp_sz);
4700         ret |= _verify_fore_channel_attr(max_ops);
4701
4702         ret |= _verify_back_channel_attr(headerpadsz);
4703         ret |= _verify_back_channel_attr(max_rqst_sz);
4704         ret |= _verify_back_channel_attr(max_resp_sz);
4705         ret |= _verify_back_channel_attr(max_resp_sz_cached);
4706         ret |= _verify_back_channel_attr(max_ops);
4707         ret |= _verify_back_channel_attr(max_reqs);
4708
4709         return ret;
4710 }
4711
4712 static int _nfs4_proc_create_session(struct nfs_client *clp)
4713 {
4714         struct nfs4_session *session = clp->cl_session;
4715         struct nfs41_create_session_args args = {
4716                 .client = clp,
4717                 .cb_program = NFS4_CALLBACK,
4718         };
4719         struct nfs41_create_session_res res = {
4720                 .client = clp,
4721         };
4722         struct rpc_message msg = {
4723                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
4724                 .rpc_argp = &args,
4725                 .rpc_resp = &res,
4726         };
4727         int status;
4728
4729         nfs4_init_channel_attrs(&args);
4730         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
4731
4732         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
4733
4734         if (!status)
4735                 /* Verify the session's negotiated channel_attrs values */
4736                 status = nfs4_verify_channel_attrs(&args, session);
4737         if (!status) {
4738                 /* Increment the clientid slot sequence id */
4739                 clp->cl_seqid++;
4740         }
4741
4742         return status;
4743 }
4744
4745 /*
4746  * Issues a CREATE_SESSION operation to the server.
4747  * It is the responsibility of the caller to verify the session is
4748  * expired before calling this routine.
4749  */
4750 int nfs4_proc_create_session(struct nfs_client *clp, int reset)
4751 {
4752         int status;
4753         unsigned *ptr;
4754         struct nfs_fsinfo fsinfo;
4755         struct nfs4_session *session = clp->cl_session;
4756
4757         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
4758
4759         status = _nfs4_proc_create_session(clp);
4760         if (status)
4761                 goto out;
4762
4763         /* Init or reset the fore channel */
4764         if (reset)
4765                 status = nfs4_reset_slot_tables(session);
4766         else
4767                 status = nfs4_init_slot_tables(session);
4768         dprintk("fore channel slot table initialization returned %d\n", status);
4769         if (status)
4770                 goto out;
4771
4772         ptr = (unsigned *)&session->sess_id.data[0];
4773         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
4774                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
4775
4776         if (reset)
4777                 /* Lease time is aleady set */
4778                 goto out;
4779
4780         /* Get the lease time */
4781         status = nfs4_proc_get_lease_time(clp, &fsinfo);
4782         if (status == 0) {
4783                 /* Update lease time and schedule renewal */
4784                 spin_lock(&clp->cl_lock);
4785                 clp->cl_lease_time = fsinfo.lease_time * HZ;
4786                 clp->cl_last_renewal = jiffies;
4787                 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
4788                 spin_unlock(&clp->cl_lock);
4789
4790                 nfs4_schedule_state_renewal(clp);
4791         }
4792 out:
4793         dprintk("<-- %s\n", __func__);
4794         return status;
4795 }
4796
4797 /*
4798  * Issue the over-the-wire RPC DESTROY_SESSION.
4799  * The caller must serialize access to this routine.
4800  */
4801 int nfs4_proc_destroy_session(struct nfs4_session *session)
4802 {
4803         int status = 0;
4804         struct rpc_message msg;
4805
4806         dprintk("--> nfs4_proc_destroy_session\n");
4807
4808         /* session is still being setup */
4809         if (session->clp->cl_cons_state != NFS_CS_READY)
4810                 return status;
4811
4812         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
4813         msg.rpc_argp = session;
4814         msg.rpc_resp = NULL;
4815         msg.rpc_cred = NULL;
4816         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
4817
4818         if (status)
4819                 printk(KERN_WARNING
4820                         "Got error %d from the server on DESTROY_SESSION. "
4821                         "Session has been destroyed regardless...\n", status);
4822
4823         dprintk("<-- nfs4_proc_destroy_session\n");
4824         return status;
4825 }
4826
4827 int nfs4_init_session(struct nfs_server *server)
4828 {
4829         struct nfs_client *clp = server->nfs_client;
4830         int ret;
4831
4832         if (!nfs4_has_session(clp))
4833                 return 0;
4834
4835         clp->cl_session->fc_attrs.max_rqst_sz = server->wsize;
4836         clp->cl_session->fc_attrs.max_resp_sz = server->rsize;
4837         ret = nfs4_recover_expired_lease(server);
4838         if (!ret)
4839                 ret = nfs4_check_client_ready(clp);
4840         return ret;
4841 }
4842
4843 /*
4844  * Renew the cl_session lease.
4845  */
4846 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
4847 {
4848         struct nfs4_sequence_args args;
4849         struct nfs4_sequence_res res;
4850
4851         struct rpc_message msg = {
4852                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
4853                 .rpc_argp = &args,
4854                 .rpc_resp = &res,
4855                 .rpc_cred = cred,
4856         };
4857
4858         args.sa_cache_this = 0;
4859
4860         return nfs4_call_sync_sequence(clp, clp->cl_rpcclient, &msg, &args,
4861                                        &res, 0);
4862 }
4863
4864 void nfs41_sequence_call_done(struct rpc_task *task, void *data)
4865 {
4866         struct nfs_client *clp = (struct nfs_client *)data;
4867
4868         nfs41_sequence_done(clp, task->tk_msg.rpc_resp, task->tk_status);
4869
4870         if (task->tk_status < 0) {
4871                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
4872
4873                 if (_nfs4_async_handle_error(task, NULL, clp, NULL)
4874                                                                 == -EAGAIN) {
4875                         nfs4_restart_rpc(task, clp);
4876                         return;
4877                 }
4878         }
4879         nfs41_sequence_free_slot(clp, task->tk_msg.rpc_resp);
4880         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
4881
4882         kfree(task->tk_msg.rpc_argp);
4883         kfree(task->tk_msg.rpc_resp);
4884
4885         dprintk("<-- %s\n", __func__);
4886 }
4887
4888 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
4889 {
4890         struct nfs_client *clp;
4891         struct nfs4_sequence_args *args;
4892         struct nfs4_sequence_res *res;
4893
4894         clp = (struct nfs_client *)data;
4895         args = task->tk_msg.rpc_argp;
4896         res = task->tk_msg.rpc_resp;
4897
4898         if (nfs4_setup_sequence(clp, args, res, 0, task))
4899                 return;
4900         rpc_call_start(task);
4901 }
4902
4903 static const struct rpc_call_ops nfs41_sequence_ops = {
4904         .rpc_call_done = nfs41_sequence_call_done,
4905         .rpc_call_prepare = nfs41_sequence_prepare,
4906 };
4907
4908 static int nfs41_proc_async_sequence(struct nfs_client *clp,
4909                                      struct rpc_cred *cred)
4910 {
4911         struct nfs4_sequence_args *args;
4912         struct nfs4_sequence_res *res;
4913         struct rpc_message msg = {
4914                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
4915                 .rpc_cred = cred,
4916         };
4917
4918         args = kzalloc(sizeof(*args), GFP_KERNEL);
4919         if (!args)
4920                 return -ENOMEM;
4921         res = kzalloc(sizeof(*res), GFP_KERNEL);
4922         if (!res) {
4923                 kfree(args);
4924                 return -ENOMEM;
4925         }
4926         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
4927         msg.rpc_argp = args;
4928         msg.rpc_resp = res;
4929
4930         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
4931                               &nfs41_sequence_ops, (void *)clp);
4932 }
4933
4934 #endif /* CONFIG_NFS_V4_1 */
4935
4936 struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
4937         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
4938         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
4939         .recover_open   = nfs4_open_reclaim,
4940         .recover_lock   = nfs4_lock_reclaim,
4941         .establish_clid = nfs4_init_clientid,
4942         .get_clid_cred  = nfs4_get_setclientid_cred,
4943 };
4944
4945 #if defined(CONFIG_NFS_V4_1)
4946 struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
4947         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
4948         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
4949         .recover_open   = nfs4_open_reclaim,
4950         .recover_lock   = nfs4_lock_reclaim,
4951         .establish_clid = nfs4_proc_exchange_id,
4952         .get_clid_cred  = nfs4_get_exchange_id_cred,
4953 };
4954 #endif /* CONFIG_NFS_V4_1 */
4955
4956 struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
4957         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
4958         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
4959         .recover_open   = nfs4_open_expired,
4960         .recover_lock   = nfs4_lock_expired,
4961         .establish_clid = nfs4_init_clientid,
4962         .get_clid_cred  = nfs4_get_setclientid_cred,
4963 };
4964
4965 #if defined(CONFIG_NFS_V4_1)
4966 struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
4967         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
4968         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
4969         .recover_open   = nfs4_open_expired,
4970         .recover_lock   = nfs4_lock_expired,
4971         .establish_clid = nfs4_proc_exchange_id,
4972         .get_clid_cred  = nfs4_get_exchange_id_cred,
4973 };
4974 #endif /* CONFIG_NFS_V4_1 */
4975
4976 struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
4977         .sched_state_renewal = nfs4_proc_async_renew,
4978         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
4979         .renew_lease = nfs4_proc_renew,
4980 };
4981
4982 #if defined(CONFIG_NFS_V4_1)
4983 struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
4984         .sched_state_renewal = nfs41_proc_async_sequence,
4985         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
4986         .renew_lease = nfs4_proc_sequence,
4987 };
4988 #endif
4989
4990 /*
4991  * Per minor version reboot and network partition recovery ops
4992  */
4993
4994 struct nfs4_state_recovery_ops *nfs4_reboot_recovery_ops[] = {
4995         &nfs40_reboot_recovery_ops,
4996 #if defined(CONFIG_NFS_V4_1)
4997         &nfs41_reboot_recovery_ops,
4998 #endif
4999 };
5000
5001 struct nfs4_state_recovery_ops *nfs4_nograce_recovery_ops[] = {
5002         &nfs40_nograce_recovery_ops,
5003 #if defined(CONFIG_NFS_V4_1)
5004         &nfs41_nograce_recovery_ops,
5005 #endif
5006 };
5007
5008 struct nfs4_state_maintenance_ops *nfs4_state_renewal_ops[] = {
5009         &nfs40_state_renewal_ops,
5010 #if defined(CONFIG_NFS_V4_1)
5011         &nfs41_state_renewal_ops,
5012 #endif
5013 };
5014
5015 static const struct inode_operations nfs4_file_inode_operations = {
5016         .permission     = nfs_permission,
5017         .getattr        = nfs_getattr,
5018         .setattr        = nfs_setattr,
5019         .getxattr       = nfs4_getxattr,
5020         .setxattr       = nfs4_setxattr,
5021         .listxattr      = nfs4_listxattr,
5022 };
5023
5024 const struct nfs_rpc_ops nfs_v4_clientops = {
5025         .version        = 4,                    /* protocol version */
5026         .dentry_ops     = &nfs4_dentry_operations,
5027         .dir_inode_ops  = &nfs4_dir_inode_operations,
5028         .file_inode_ops = &nfs4_file_inode_operations,
5029         .getroot        = nfs4_proc_get_root,
5030         .getattr        = nfs4_proc_getattr,
5031         .setattr        = nfs4_proc_setattr,
5032         .lookupfh       = nfs4_proc_lookupfh,
5033         .lookup         = nfs4_proc_lookup,
5034         .access         = nfs4_proc_access,
5035         .readlink       = nfs4_proc_readlink,
5036         .create         = nfs4_proc_create,
5037         .remove         = nfs4_proc_remove,
5038         .unlink_setup   = nfs4_proc_unlink_setup,
5039         .unlink_done    = nfs4_proc_unlink_done,
5040         .rename         = nfs4_proc_rename,
5041         .link           = nfs4_proc_link,
5042         .symlink        = nfs4_proc_symlink,
5043         .mkdir          = nfs4_proc_mkdir,
5044         .rmdir          = nfs4_proc_remove,
5045         .readdir        = nfs4_proc_readdir,
5046         .mknod          = nfs4_proc_mknod,
5047         .statfs         = nfs4_proc_statfs,
5048         .fsinfo         = nfs4_proc_fsinfo,
5049         .pathconf       = nfs4_proc_pathconf,
5050         .set_capabilities = nfs4_server_capabilities,
5051         .decode_dirent  = nfs4_decode_dirent,
5052         .read_setup     = nfs4_proc_read_setup,
5053         .read_done      = nfs4_read_done,
5054         .write_setup    = nfs4_proc_write_setup,
5055         .write_done     = nfs4_write_done,
5056         .commit_setup   = nfs4_proc_commit_setup,
5057         .commit_done    = nfs4_commit_done,
5058         .lock           = nfs4_proc_lock,
5059         .clear_acl_cache = nfs4_zap_acl_attr,
5060         .close_context  = nfs4_close_context,
5061 };
5062
5063 /*
5064  * Local variables:
5065  *  c-basic-offset: 8
5066  * End:
5067  */