nfs41: add create session into establish_clid
[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                         if (exception->timeout > HZ) {
279                                 /* We have retried a decent amount, time to
280                                  * fail
281                                  */
282                                 ret = -EBUSY;
283                                 break;
284                         }
285                 case -NFS4ERR_GRACE:
286                 case -NFS4ERR_DELAY:
287                         ret = nfs4_delay(server->client, &exception->timeout);
288                         if (ret != 0)
289                                 break;
290                 case -NFS4ERR_OLD_STATEID:
291                         exception->retry = 1;
292         }
293         /* We failed to handle the error */
294         return nfs4_map_errors(ret);
295 }
296
297
298 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
299 {
300         struct nfs_client *clp = server->nfs_client;
301         spin_lock(&clp->cl_lock);
302         if (time_before(clp->cl_last_renewal,timestamp))
303                 clp->cl_last_renewal = timestamp;
304         spin_unlock(&clp->cl_lock);
305 }
306
307 #if defined(CONFIG_NFS_V4_1)
308
309 /*
310  * nfs4_free_slot - free a slot and efficiently update slot table.
311  *
312  * freeing a slot is trivially done by clearing its respective bit
313  * in the bitmap.
314  * If the freed slotid equals highest_used_slotid we want to update it
315  * so that the server would be able to size down the slot table if needed,
316  * otherwise we know that the highest_used_slotid is still in use.
317  * When updating highest_used_slotid there may be "holes" in the bitmap
318  * so we need to scan down from highest_used_slotid to 0 looking for the now
319  * highest slotid in use.
320  * If none found, highest_used_slotid is set to -1.
321  */
322 static void
323 nfs4_free_slot(struct nfs4_slot_table *tbl, u8 free_slotid)
324 {
325         int slotid = free_slotid;
326
327         spin_lock(&tbl->slot_tbl_lock);
328         /* clear used bit in bitmap */
329         __clear_bit(slotid, tbl->used_slots);
330
331         /* update highest_used_slotid when it is freed */
332         if (slotid == tbl->highest_used_slotid) {
333                 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
334                 if (slotid >= 0 && slotid < tbl->max_slots)
335                         tbl->highest_used_slotid = slotid;
336                 else
337                         tbl->highest_used_slotid = -1;
338         }
339         rpc_wake_up_next(&tbl->slot_tbl_waitq);
340         spin_unlock(&tbl->slot_tbl_lock);
341         dprintk("%s: free_slotid %u highest_used_slotid %d\n", __func__,
342                 free_slotid, tbl->highest_used_slotid);
343 }
344
345 void nfs41_sequence_free_slot(const struct nfs_client *clp,
346                               struct nfs4_sequence_res *res)
347 {
348         struct nfs4_slot_table *tbl;
349
350         if (!nfs4_has_session(clp)) {
351                 dprintk("%s: No session\n", __func__);
352                 return;
353         }
354         tbl = &clp->cl_session->fc_slot_table;
355         if (res->sr_slotid == NFS4_MAX_SLOT_TABLE) {
356                 dprintk("%s: No slot\n", __func__);
357                 /* just wake up the next guy waiting since
358                  * we may have not consumed a slot after all */
359                 rpc_wake_up_next(&tbl->slot_tbl_waitq);
360                 return;
361         }
362         nfs4_free_slot(tbl, res->sr_slotid);
363         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
364 }
365
366 static void nfs41_sequence_done(struct nfs_client *clp,
367                                 struct nfs4_sequence_res *res,
368                                 int rpc_status)
369 {
370         unsigned long timestamp;
371         struct nfs4_slot_table *tbl;
372         struct nfs4_slot *slot;
373
374         /*
375          * sr_status remains 1 if an RPC level error occurred. The server
376          * may or may not have processed the sequence operation..
377          * Proceed as if the server received and processed the sequence
378          * operation.
379          */
380         if (res->sr_status == 1)
381                 res->sr_status = NFS_OK;
382
383         /* -ERESTARTSYS can result in skipping nfs41_sequence_setup */
384         if (res->sr_slotid == NFS4_MAX_SLOT_TABLE)
385                 goto out;
386
387         tbl = &clp->cl_session->fc_slot_table;
388         slot = tbl->slots + res->sr_slotid;
389
390         if (res->sr_status == 0) {
391                 /* Update the slot's sequence and clientid lease timer */
392                 ++slot->seq_nr;
393                 timestamp = res->sr_renewal_time;
394                 spin_lock(&clp->cl_lock);
395                 if (time_before(clp->cl_last_renewal, timestamp))
396                         clp->cl_last_renewal = timestamp;
397                 spin_unlock(&clp->cl_lock);
398                 return;
399         }
400 out:
401         /* The session may be reset by one of the error handlers. */
402         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
403         nfs41_sequence_free_slot(clp, res);
404 }
405
406 /*
407  * nfs4_find_slot - efficiently look for a free slot
408  *
409  * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
410  * If found, we mark the slot as used, update the highest_used_slotid,
411  * and respectively set up the sequence operation args.
412  * The slot number is returned if found, or NFS4_MAX_SLOT_TABLE otherwise.
413  *
414  * Note: must be called with under the slot_tbl_lock.
415  */
416 static u8
417 nfs4_find_slot(struct nfs4_slot_table *tbl, struct rpc_task *task)
418 {
419         int slotid;
420         u8 ret_id = NFS4_MAX_SLOT_TABLE;
421         BUILD_BUG_ON((u8)NFS4_MAX_SLOT_TABLE != (int)NFS4_MAX_SLOT_TABLE);
422
423         dprintk("--> %s used_slots=%04lx highest_used=%d max_slots=%d\n",
424                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
425                 tbl->max_slots);
426         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
427         if (slotid >= tbl->max_slots)
428                 goto out;
429         __set_bit(slotid, tbl->used_slots);
430         if (slotid > tbl->highest_used_slotid)
431                 tbl->highest_used_slotid = slotid;
432         ret_id = slotid;
433 out:
434         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
435                 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
436         return ret_id;
437 }
438
439 static int nfs4_recover_session(struct nfs4_session *session)
440 {
441         struct nfs_client *clp = session->clp;
442         unsigned int loop;
443         int ret;
444
445         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
446                 ret = nfs4_wait_clnt_recover(clp);
447                 if (ret != 0)
448                         break;
449                 if (!test_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state))
450                         break;
451                 nfs4_schedule_state_manager(clp);
452                 ret = -EIO;
453         }
454         return ret;
455 }
456
457 static int nfs41_setup_sequence(struct nfs4_session *session,
458                                 struct nfs4_sequence_args *args,
459                                 struct nfs4_sequence_res *res,
460                                 int cache_reply,
461                                 struct rpc_task *task)
462 {
463         struct nfs4_slot *slot;
464         struct nfs4_slot_table *tbl;
465         int status = 0;
466         u8 slotid;
467
468         dprintk("--> %s\n", __func__);
469         /* slot already allocated? */
470         if (res->sr_slotid != NFS4_MAX_SLOT_TABLE)
471                 return 0;
472
473         memset(res, 0, sizeof(*res));
474         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
475         tbl = &session->fc_slot_table;
476
477         spin_lock(&tbl->slot_tbl_lock);
478         if (test_bit(NFS4CLNT_SESSION_SETUP, &session->clp->cl_state)) {
479                 if (tbl->highest_used_slotid != -1) {
480                         rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
481                         spin_unlock(&tbl->slot_tbl_lock);
482                         dprintk("<-- %s: Session reset: draining\n", __func__);
483                         return -EAGAIN;
484                 }
485
486                 /* The slot table is empty; start the reset thread */
487                 dprintk("%s Session Reset\n", __func__);
488                 spin_unlock(&tbl->slot_tbl_lock);
489                 status = nfs4_recover_session(session);
490                 if (status)
491                         return status;
492                 spin_lock(&tbl->slot_tbl_lock);
493         }
494
495         slotid = nfs4_find_slot(tbl, task);
496         if (slotid == NFS4_MAX_SLOT_TABLE) {
497                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
498                 spin_unlock(&tbl->slot_tbl_lock);
499                 dprintk("<-- %s: no free slots\n", __func__);
500                 return -EAGAIN;
501         }
502         spin_unlock(&tbl->slot_tbl_lock);
503
504         slot = tbl->slots + slotid;
505         args->sa_session = session;
506         args->sa_slotid = slotid;
507         args->sa_cache_this = cache_reply;
508
509         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
510
511         res->sr_session = session;
512         res->sr_slotid = slotid;
513         res->sr_renewal_time = jiffies;
514         /*
515          * sr_status is only set in decode_sequence, and so will remain
516          * set to 1 if an rpc level failure occurs.
517          */
518         res->sr_status = 1;
519         return 0;
520 }
521
522 int nfs4_setup_sequence(struct nfs_client *clp,
523                         struct nfs4_sequence_args *args,
524                         struct nfs4_sequence_res *res,
525                         int cache_reply,
526                         struct rpc_task *task)
527 {
528         int ret = 0;
529
530         dprintk("--> %s clp %p session %p sr_slotid %d\n",
531                 __func__, clp, clp->cl_session, res->sr_slotid);
532
533         if (!nfs4_has_session(clp))
534                 goto out;
535         ret = nfs41_setup_sequence(clp->cl_session, args, res, cache_reply,
536                                    task);
537         if (ret != -EAGAIN) {
538                 /* terminate rpc task */
539                 task->tk_status = ret;
540                 task->tk_action = NULL;
541         }
542 out:
543         dprintk("<-- %s status=%d\n", __func__, ret);
544         return ret;
545 }
546
547 struct nfs41_call_sync_data {
548         struct nfs_client *clp;
549         struct nfs4_sequence_args *seq_args;
550         struct nfs4_sequence_res *seq_res;
551         int cache_reply;
552 };
553
554 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
555 {
556         struct nfs41_call_sync_data *data = calldata;
557
558         dprintk("--> %s data->clp->cl_session %p\n", __func__,
559                 data->clp->cl_session);
560         if (nfs4_setup_sequence(data->clp, data->seq_args,
561                                 data->seq_res, data->cache_reply, task))
562                 return;
563         rpc_call_start(task);
564 }
565
566 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
567 {
568         struct nfs41_call_sync_data *data = calldata;
569
570         nfs41_sequence_done(data->clp, data->seq_res, task->tk_status);
571         nfs41_sequence_free_slot(data->clp, data->seq_res);
572 }
573
574 struct rpc_call_ops nfs41_call_sync_ops = {
575         .rpc_call_prepare = nfs41_call_sync_prepare,
576         .rpc_call_done = nfs41_call_sync_done,
577 };
578
579 static int nfs4_call_sync_sequence(struct nfs_client *clp,
580                                    struct rpc_clnt *clnt,
581                                    struct rpc_message *msg,
582                                    struct nfs4_sequence_args *args,
583                                    struct nfs4_sequence_res *res,
584                                    int cache_reply)
585 {
586         int ret;
587         struct rpc_task *task;
588         struct nfs41_call_sync_data data = {
589                 .clp = clp,
590                 .seq_args = args,
591                 .seq_res = res,
592                 .cache_reply = cache_reply,
593         };
594         struct rpc_task_setup task_setup = {
595                 .rpc_client = clnt,
596                 .rpc_message = msg,
597                 .callback_ops = &nfs41_call_sync_ops,
598                 .callback_data = &data
599         };
600
601         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
602         task = rpc_run_task(&task_setup);
603         if (IS_ERR(task))
604                 ret = PTR_ERR(task);
605         else {
606                 ret = task->tk_status;
607                 rpc_put_task(task);
608         }
609         return ret;
610 }
611
612 int _nfs4_call_sync_session(struct nfs_server *server,
613                             struct rpc_message *msg,
614                             struct nfs4_sequence_args *args,
615                             struct nfs4_sequence_res *res,
616                             int cache_reply)
617 {
618         return nfs4_call_sync_sequence(server->nfs_client, server->client,
619                                        msg, args, res, cache_reply);
620 }
621
622 #endif /* CONFIG_NFS_V4_1 */
623
624 int _nfs4_call_sync(struct nfs_server *server,
625                     struct rpc_message *msg,
626                     struct nfs4_sequence_args *args,
627                     struct nfs4_sequence_res *res,
628                     int cache_reply)
629 {
630         args->sa_session = res->sr_session = NULL;
631         return rpc_call_sync(server->client, msg, 0);
632 }
633
634 #define nfs4_call_sync(server, msg, args, res, cache_reply) \
635         (server)->nfs_client->cl_call_sync((server), (msg), &(args)->seq_args, \
636                         &(res)->seq_res, (cache_reply))
637
638 static void nfs4_sequence_done(const struct nfs_server *server,
639                                struct nfs4_sequence_res *res, int rpc_status)
640 {
641 #ifdef CONFIG_NFS_V4_1
642         if (nfs4_has_session(server->nfs_client))
643                 nfs41_sequence_done(server->nfs_client, res, rpc_status);
644 #endif /* CONFIG_NFS_V4_1 */
645 }
646
647 /* no restart, therefore free slot here */
648 static void nfs4_sequence_done_free_slot(const struct nfs_server *server,
649                                          struct nfs4_sequence_res *res,
650                                          int rpc_status)
651 {
652         nfs4_sequence_done(server, res, rpc_status);
653         nfs4_sequence_free_slot(server->nfs_client, res);
654 }
655
656 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
657 {
658         struct nfs_inode *nfsi = NFS_I(dir);
659
660         spin_lock(&dir->i_lock);
661         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
662         if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
663                 nfs_force_lookup_revalidate(dir);
664         nfsi->change_attr = cinfo->after;
665         spin_unlock(&dir->i_lock);
666 }
667
668 struct nfs4_opendata {
669         struct kref kref;
670         struct nfs_openargs o_arg;
671         struct nfs_openres o_res;
672         struct nfs_open_confirmargs c_arg;
673         struct nfs_open_confirmres c_res;
674         struct nfs_fattr f_attr;
675         struct nfs_fattr dir_attr;
676         struct path path;
677         struct dentry *dir;
678         struct nfs4_state_owner *owner;
679         struct nfs4_state *state;
680         struct iattr attrs;
681         unsigned long timestamp;
682         unsigned int rpc_done : 1;
683         int rpc_status;
684         int cancelled;
685 };
686
687
688 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
689 {
690         p->o_res.f_attr = &p->f_attr;
691         p->o_res.dir_attr = &p->dir_attr;
692         p->o_res.seqid = p->o_arg.seqid;
693         p->c_res.seqid = p->c_arg.seqid;
694         p->o_res.server = p->o_arg.server;
695         nfs_fattr_init(&p->f_attr);
696         nfs_fattr_init(&p->dir_attr);
697         p->o_res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
698 }
699
700 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
701                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
702                 const struct iattr *attrs)
703 {
704         struct dentry *parent = dget_parent(path->dentry);
705         struct inode *dir = parent->d_inode;
706         struct nfs_server *server = NFS_SERVER(dir);
707         struct nfs4_opendata *p;
708
709         p = kzalloc(sizeof(*p), GFP_KERNEL);
710         if (p == NULL)
711                 goto err;
712         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
713         if (p->o_arg.seqid == NULL)
714                 goto err_free;
715         p->path.mnt = mntget(path->mnt);
716         p->path.dentry = dget(path->dentry);
717         p->dir = parent;
718         p->owner = sp;
719         atomic_inc(&sp->so_count);
720         p->o_arg.fh = NFS_FH(dir);
721         p->o_arg.open_flags = flags;
722         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
723         p->o_arg.clientid = server->nfs_client->cl_clientid;
724         p->o_arg.id = sp->so_owner_id.id;
725         p->o_arg.name = &p->path.dentry->d_name;
726         p->o_arg.server = server;
727         p->o_arg.bitmask = server->attr_bitmask;
728         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
729         if (flags & O_EXCL) {
730                 u32 *s = (u32 *) p->o_arg.u.verifier.data;
731                 s[0] = jiffies;
732                 s[1] = current->pid;
733         } else if (flags & O_CREAT) {
734                 p->o_arg.u.attrs = &p->attrs;
735                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
736         }
737         p->c_arg.fh = &p->o_res.fh;
738         p->c_arg.stateid = &p->o_res.stateid;
739         p->c_arg.seqid = p->o_arg.seqid;
740         nfs4_init_opendata_res(p);
741         kref_init(&p->kref);
742         return p;
743 err_free:
744         kfree(p);
745 err:
746         dput(parent);
747         return NULL;
748 }
749
750 static void nfs4_opendata_free(struct kref *kref)
751 {
752         struct nfs4_opendata *p = container_of(kref,
753                         struct nfs4_opendata, kref);
754
755         nfs_free_seqid(p->o_arg.seqid);
756         if (p->state != NULL)
757                 nfs4_put_open_state(p->state);
758         nfs4_put_state_owner(p->owner);
759         dput(p->dir);
760         path_put(&p->path);
761         kfree(p);
762 }
763
764 static void nfs4_opendata_put(struct nfs4_opendata *p)
765 {
766         if (p != NULL)
767                 kref_put(&p->kref, nfs4_opendata_free);
768 }
769
770 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
771 {
772         int ret;
773
774         ret = rpc_wait_for_completion_task(task);
775         return ret;
776 }
777
778 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
779 {
780         int ret = 0;
781
782         if (open_mode & O_EXCL)
783                 goto out;
784         switch (mode & (FMODE_READ|FMODE_WRITE)) {
785                 case FMODE_READ:
786                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0;
787                         break;
788                 case FMODE_WRITE:
789                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0;
790                         break;
791                 case FMODE_READ|FMODE_WRITE:
792                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0;
793         }
794 out:
795         return ret;
796 }
797
798 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
799 {
800         if ((delegation->type & fmode) != fmode)
801                 return 0;
802         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
803                 return 0;
804         nfs_mark_delegation_referenced(delegation);
805         return 1;
806 }
807
808 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
809 {
810         switch (fmode) {
811                 case FMODE_WRITE:
812                         state->n_wronly++;
813                         break;
814                 case FMODE_READ:
815                         state->n_rdonly++;
816                         break;
817                 case FMODE_READ|FMODE_WRITE:
818                         state->n_rdwr++;
819         }
820         nfs4_state_set_mode_locked(state, state->state | fmode);
821 }
822
823 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
824 {
825         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
826                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
827         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
828         switch (fmode) {
829                 case FMODE_READ:
830                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
831                         break;
832                 case FMODE_WRITE:
833                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
834                         break;
835                 case FMODE_READ|FMODE_WRITE:
836                         set_bit(NFS_O_RDWR_STATE, &state->flags);
837         }
838 }
839
840 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
841 {
842         write_seqlock(&state->seqlock);
843         nfs_set_open_stateid_locked(state, stateid, fmode);
844         write_sequnlock(&state->seqlock);
845 }
846
847 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
848 {
849         /*
850          * Protect the call to nfs4_state_set_mode_locked and
851          * serialise the stateid update
852          */
853         write_seqlock(&state->seqlock);
854         if (deleg_stateid != NULL) {
855                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
856                 set_bit(NFS_DELEGATED_STATE, &state->flags);
857         }
858         if (open_stateid != NULL)
859                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
860         write_sequnlock(&state->seqlock);
861         spin_lock(&state->owner->so_lock);
862         update_open_stateflags(state, fmode);
863         spin_unlock(&state->owner->so_lock);
864 }
865
866 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
867 {
868         struct nfs_inode *nfsi = NFS_I(state->inode);
869         struct nfs_delegation *deleg_cur;
870         int ret = 0;
871
872         fmode &= (FMODE_READ|FMODE_WRITE);
873
874         rcu_read_lock();
875         deleg_cur = rcu_dereference(nfsi->delegation);
876         if (deleg_cur == NULL)
877                 goto no_delegation;
878
879         spin_lock(&deleg_cur->lock);
880         if (nfsi->delegation != deleg_cur ||
881             (deleg_cur->type & fmode) != fmode)
882                 goto no_delegation_unlock;
883
884         if (delegation == NULL)
885                 delegation = &deleg_cur->stateid;
886         else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
887                 goto no_delegation_unlock;
888
889         nfs_mark_delegation_referenced(deleg_cur);
890         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
891         ret = 1;
892 no_delegation_unlock:
893         spin_unlock(&deleg_cur->lock);
894 no_delegation:
895         rcu_read_unlock();
896
897         if (!ret && open_stateid != NULL) {
898                 __update_open_stateid(state, open_stateid, NULL, fmode);
899                 ret = 1;
900         }
901
902         return ret;
903 }
904
905
906 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
907 {
908         struct nfs_delegation *delegation;
909
910         rcu_read_lock();
911         delegation = rcu_dereference(NFS_I(inode)->delegation);
912         if (delegation == NULL || (delegation->type & fmode) == fmode) {
913                 rcu_read_unlock();
914                 return;
915         }
916         rcu_read_unlock();
917         nfs_inode_return_delegation(inode);
918 }
919
920 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
921 {
922         struct nfs4_state *state = opendata->state;
923         struct nfs_inode *nfsi = NFS_I(state->inode);
924         struct nfs_delegation *delegation;
925         int open_mode = opendata->o_arg.open_flags & O_EXCL;
926         fmode_t fmode = opendata->o_arg.fmode;
927         nfs4_stateid stateid;
928         int ret = -EAGAIN;
929
930         for (;;) {
931                 if (can_open_cached(state, fmode, open_mode)) {
932                         spin_lock(&state->owner->so_lock);
933                         if (can_open_cached(state, fmode, open_mode)) {
934                                 update_open_stateflags(state, fmode);
935                                 spin_unlock(&state->owner->so_lock);
936                                 goto out_return_state;
937                         }
938                         spin_unlock(&state->owner->so_lock);
939                 }
940                 rcu_read_lock();
941                 delegation = rcu_dereference(nfsi->delegation);
942                 if (delegation == NULL ||
943                     !can_open_delegated(delegation, fmode)) {
944                         rcu_read_unlock();
945                         break;
946                 }
947                 /* Save the delegation */
948                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
949                 rcu_read_unlock();
950                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
951                 if (ret != 0)
952                         goto out;
953                 ret = -EAGAIN;
954
955                 /* Try to update the stateid using the delegation */
956                 if (update_open_stateid(state, NULL, &stateid, fmode))
957                         goto out_return_state;
958         }
959 out:
960         return ERR_PTR(ret);
961 out_return_state:
962         atomic_inc(&state->count);
963         return state;
964 }
965
966 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
967 {
968         struct inode *inode;
969         struct nfs4_state *state = NULL;
970         struct nfs_delegation *delegation;
971         int ret;
972
973         if (!data->rpc_done) {
974                 state = nfs4_try_open_cached(data);
975                 goto out;
976         }
977
978         ret = -EAGAIN;
979         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
980                 goto err;
981         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
982         ret = PTR_ERR(inode);
983         if (IS_ERR(inode))
984                 goto err;
985         ret = -ENOMEM;
986         state = nfs4_get_open_state(inode, data->owner);
987         if (state == NULL)
988                 goto err_put_inode;
989         if (data->o_res.delegation_type != 0) {
990                 int delegation_flags = 0;
991
992                 rcu_read_lock();
993                 delegation = rcu_dereference(NFS_I(inode)->delegation);
994                 if (delegation)
995                         delegation_flags = delegation->flags;
996                 rcu_read_unlock();
997                 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
998                         nfs_inode_set_delegation(state->inode,
999                                         data->owner->so_cred,
1000                                         &data->o_res);
1001                 else
1002                         nfs_inode_reclaim_delegation(state->inode,
1003                                         data->owner->so_cred,
1004                                         &data->o_res);
1005         }
1006
1007         update_open_stateid(state, &data->o_res.stateid, NULL,
1008                         data->o_arg.fmode);
1009         iput(inode);
1010 out:
1011         return state;
1012 err_put_inode:
1013         iput(inode);
1014 err:
1015         return ERR_PTR(ret);
1016 }
1017
1018 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1019 {
1020         struct nfs_inode *nfsi = NFS_I(state->inode);
1021         struct nfs_open_context *ctx;
1022
1023         spin_lock(&state->inode->i_lock);
1024         list_for_each_entry(ctx, &nfsi->open_files, list) {
1025                 if (ctx->state != state)
1026                         continue;
1027                 get_nfs_open_context(ctx);
1028                 spin_unlock(&state->inode->i_lock);
1029                 return ctx;
1030         }
1031         spin_unlock(&state->inode->i_lock);
1032         return ERR_PTR(-ENOENT);
1033 }
1034
1035 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1036 {
1037         struct nfs4_opendata *opendata;
1038
1039         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, 0, NULL);
1040         if (opendata == NULL)
1041                 return ERR_PTR(-ENOMEM);
1042         opendata->state = state;
1043         atomic_inc(&state->count);
1044         return opendata;
1045 }
1046
1047 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1048 {
1049         struct nfs4_state *newstate;
1050         int ret;
1051
1052         opendata->o_arg.open_flags = 0;
1053         opendata->o_arg.fmode = fmode;
1054         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1055         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1056         nfs4_init_opendata_res(opendata);
1057         ret = _nfs4_proc_open(opendata);
1058         if (ret != 0)
1059                 return ret; 
1060         newstate = nfs4_opendata_to_nfs4_state(opendata);
1061         if (IS_ERR(newstate))
1062                 return PTR_ERR(newstate);
1063         nfs4_close_state(&opendata->path, newstate, fmode);
1064         *res = newstate;
1065         return 0;
1066 }
1067
1068 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1069 {
1070         struct nfs4_state *newstate;
1071         int ret;
1072
1073         /* memory barrier prior to reading state->n_* */
1074         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1075         smp_rmb();
1076         if (state->n_rdwr != 0) {
1077                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1078                 if (ret != 0)
1079                         return ret;
1080                 if (newstate != state)
1081                         return -ESTALE;
1082         }
1083         if (state->n_wronly != 0) {
1084                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1085                 if (ret != 0)
1086                         return ret;
1087                 if (newstate != state)
1088                         return -ESTALE;
1089         }
1090         if (state->n_rdonly != 0) {
1091                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1092                 if (ret != 0)
1093                         return ret;
1094                 if (newstate != state)
1095                         return -ESTALE;
1096         }
1097         /*
1098          * We may have performed cached opens for all three recoveries.
1099          * Check if we need to update the current stateid.
1100          */
1101         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1102             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
1103                 write_seqlock(&state->seqlock);
1104                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1105                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
1106                 write_sequnlock(&state->seqlock);
1107         }
1108         return 0;
1109 }
1110
1111 /*
1112  * OPEN_RECLAIM:
1113  *      reclaim state on the server after a reboot.
1114  */
1115 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1116 {
1117         struct nfs_delegation *delegation;
1118         struct nfs4_opendata *opendata;
1119         fmode_t delegation_type = 0;
1120         int status;
1121
1122         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1123         if (IS_ERR(opendata))
1124                 return PTR_ERR(opendata);
1125         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1126         opendata->o_arg.fh = NFS_FH(state->inode);
1127         rcu_read_lock();
1128         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1129         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1130                 delegation_type = delegation->type;
1131         rcu_read_unlock();
1132         opendata->o_arg.u.delegation_type = delegation_type;
1133         status = nfs4_open_recover(opendata, state);
1134         nfs4_opendata_put(opendata);
1135         return status;
1136 }
1137
1138 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1139 {
1140         struct nfs_server *server = NFS_SERVER(state->inode);
1141         struct nfs4_exception exception = { };
1142         int err;
1143         do {
1144                 err = _nfs4_do_open_reclaim(ctx, state);
1145                 if (err != -NFS4ERR_DELAY)
1146                         break;
1147                 nfs4_handle_exception(server, err, &exception);
1148         } while (exception.retry);
1149         return err;
1150 }
1151
1152 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1153 {
1154         struct nfs_open_context *ctx;
1155         int ret;
1156
1157         ctx = nfs4_state_find_open_context(state);
1158         if (IS_ERR(ctx))
1159                 return PTR_ERR(ctx);
1160         ret = nfs4_do_open_reclaim(ctx, state);
1161         put_nfs_open_context(ctx);
1162         return ret;
1163 }
1164
1165 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1166 {
1167         struct nfs4_opendata *opendata;
1168         int ret;
1169
1170         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1171         if (IS_ERR(opendata))
1172                 return PTR_ERR(opendata);
1173         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1174         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
1175                         sizeof(opendata->o_arg.u.delegation.data));
1176         ret = nfs4_open_recover(opendata, state);
1177         nfs4_opendata_put(opendata);
1178         return ret;
1179 }
1180
1181 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1182 {
1183         struct nfs4_exception exception = { };
1184         struct nfs_server *server = NFS_SERVER(state->inode);
1185         int err;
1186         do {
1187                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1188                 switch (err) {
1189                         case 0:
1190                         case -ENOENT:
1191                         case -ESTALE:
1192                                 goto out;
1193                         case -NFS4ERR_STALE_CLIENTID:
1194                         case -NFS4ERR_STALE_STATEID:
1195                         case -NFS4ERR_EXPIRED:
1196                                 /* Don't recall a delegation if it was lost */
1197                                 nfs4_schedule_state_recovery(server->nfs_client);
1198                                 goto out;
1199                         case -ERESTARTSYS:
1200                                 /*
1201                                  * The show must go on: exit, but mark the
1202                                  * stateid as needing recovery.
1203                                  */
1204                         case -NFS4ERR_ADMIN_REVOKED:
1205                         case -NFS4ERR_BAD_STATEID:
1206                                 nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
1207                         case -ENOMEM:
1208                                 err = 0;
1209                                 goto out;
1210                 }
1211                 err = nfs4_handle_exception(server, err, &exception);
1212         } while (exception.retry);
1213 out:
1214         return err;
1215 }
1216
1217 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1218 {
1219         struct nfs4_opendata *data = calldata;
1220
1221         data->rpc_status = task->tk_status;
1222         if (RPC_ASSASSINATED(task))
1223                 return;
1224         if (data->rpc_status == 0) {
1225                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
1226                                 sizeof(data->o_res.stateid.data));
1227                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1228                 renew_lease(data->o_res.server, data->timestamp);
1229                 data->rpc_done = 1;
1230         }
1231 }
1232
1233 static void nfs4_open_confirm_release(void *calldata)
1234 {
1235         struct nfs4_opendata *data = calldata;
1236         struct nfs4_state *state = NULL;
1237
1238         /* If this request hasn't been cancelled, do nothing */
1239         if (data->cancelled == 0)
1240                 goto out_free;
1241         /* In case of error, no cleanup! */
1242         if (!data->rpc_done)
1243                 goto out_free;
1244         state = nfs4_opendata_to_nfs4_state(data);
1245         if (!IS_ERR(state))
1246                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1247 out_free:
1248         nfs4_opendata_put(data);
1249 }
1250
1251 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1252         .rpc_call_done = nfs4_open_confirm_done,
1253         .rpc_release = nfs4_open_confirm_release,
1254 };
1255
1256 /*
1257  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1258  */
1259 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1260 {
1261         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1262         struct rpc_task *task;
1263         struct  rpc_message msg = {
1264                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1265                 .rpc_argp = &data->c_arg,
1266                 .rpc_resp = &data->c_res,
1267                 .rpc_cred = data->owner->so_cred,
1268         };
1269         struct rpc_task_setup task_setup_data = {
1270                 .rpc_client = server->client,
1271                 .rpc_message = &msg,
1272                 .callback_ops = &nfs4_open_confirm_ops,
1273                 .callback_data = data,
1274                 .workqueue = nfsiod_workqueue,
1275                 .flags = RPC_TASK_ASYNC,
1276         };
1277         int status;
1278
1279         kref_get(&data->kref);
1280         data->rpc_done = 0;
1281         data->rpc_status = 0;
1282         data->timestamp = jiffies;
1283         task = rpc_run_task(&task_setup_data);
1284         if (IS_ERR(task))
1285                 return PTR_ERR(task);
1286         status = nfs4_wait_for_completion_rpc_task(task);
1287         if (status != 0) {
1288                 data->cancelled = 1;
1289                 smp_wmb();
1290         } else
1291                 status = data->rpc_status;
1292         rpc_put_task(task);
1293         return status;
1294 }
1295
1296 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1297 {
1298         struct nfs4_opendata *data = calldata;
1299         struct nfs4_state_owner *sp = data->owner;
1300
1301         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1302                 return;
1303         /*
1304          * Check if we still need to send an OPEN call, or if we can use
1305          * a delegation instead.
1306          */
1307         if (data->state != NULL) {
1308                 struct nfs_delegation *delegation;
1309
1310                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1311                         goto out_no_action;
1312                 rcu_read_lock();
1313                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1314                 if (delegation != NULL &&
1315                     test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) {
1316                         rcu_read_unlock();
1317                         goto out_no_action;
1318                 }
1319                 rcu_read_unlock();
1320         }
1321         /* Update sequence id. */
1322         data->o_arg.id = sp->so_owner_id.id;
1323         data->o_arg.clientid = sp->so_client->cl_clientid;
1324         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1325                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1326                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1327         }
1328         data->timestamp = jiffies;
1329         if (nfs4_setup_sequence(data->o_arg.server->nfs_client,
1330                                 &data->o_arg.seq_args,
1331                                 &data->o_res.seq_res, 1, task))
1332                 return;
1333         rpc_call_start(task);
1334         return;
1335 out_no_action:
1336         task->tk_action = NULL;
1337
1338 }
1339
1340 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1341 {
1342         struct nfs4_opendata *data = calldata;
1343
1344         data->rpc_status = task->tk_status;
1345
1346         nfs4_sequence_done_free_slot(data->o_arg.server, &data->o_res.seq_res,
1347                                      task->tk_status);
1348
1349         if (RPC_ASSASSINATED(task))
1350                 return;
1351         if (task->tk_status == 0) {
1352                 switch (data->o_res.f_attr->mode & S_IFMT) {
1353                         case S_IFREG:
1354                                 break;
1355                         case S_IFLNK:
1356                                 data->rpc_status = -ELOOP;
1357                                 break;
1358                         case S_IFDIR:
1359                                 data->rpc_status = -EISDIR;
1360                                 break;
1361                         default:
1362                                 data->rpc_status = -ENOTDIR;
1363                 }
1364                 renew_lease(data->o_res.server, data->timestamp);
1365                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1366                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1367         }
1368         data->rpc_done = 1;
1369 }
1370
1371 static void nfs4_open_release(void *calldata)
1372 {
1373         struct nfs4_opendata *data = calldata;
1374         struct nfs4_state *state = NULL;
1375
1376         /* If this request hasn't been cancelled, do nothing */
1377         if (data->cancelled == 0)
1378                 goto out_free;
1379         /* In case of error, no cleanup! */
1380         if (data->rpc_status != 0 || !data->rpc_done)
1381                 goto out_free;
1382         /* In case we need an open_confirm, no cleanup! */
1383         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1384                 goto out_free;
1385         state = nfs4_opendata_to_nfs4_state(data);
1386         if (!IS_ERR(state))
1387                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1388 out_free:
1389         nfs4_opendata_put(data);
1390 }
1391
1392 static const struct rpc_call_ops nfs4_open_ops = {
1393         .rpc_call_prepare = nfs4_open_prepare,
1394         .rpc_call_done = nfs4_open_done,
1395         .rpc_release = nfs4_open_release,
1396 };
1397
1398 /*
1399  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1400  */
1401 static int _nfs4_proc_open(struct nfs4_opendata *data)
1402 {
1403         struct inode *dir = data->dir->d_inode;
1404         struct nfs_server *server = NFS_SERVER(dir);
1405         struct nfs_openargs *o_arg = &data->o_arg;
1406         struct nfs_openres *o_res = &data->o_res;
1407         struct rpc_task *task;
1408         struct rpc_message msg = {
1409                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1410                 .rpc_argp = o_arg,
1411                 .rpc_resp = o_res,
1412                 .rpc_cred = data->owner->so_cred,
1413         };
1414         struct rpc_task_setup task_setup_data = {
1415                 .rpc_client = server->client,
1416                 .rpc_message = &msg,
1417                 .callback_ops = &nfs4_open_ops,
1418                 .callback_data = data,
1419                 .workqueue = nfsiod_workqueue,
1420                 .flags = RPC_TASK_ASYNC,
1421         };
1422         int status;
1423
1424         kref_get(&data->kref);
1425         data->rpc_done = 0;
1426         data->rpc_status = 0;
1427         data->cancelled = 0;
1428         task = rpc_run_task(&task_setup_data);
1429         if (IS_ERR(task))
1430                 return PTR_ERR(task);
1431         status = nfs4_wait_for_completion_rpc_task(task);
1432         if (status != 0) {
1433                 data->cancelled = 1;
1434                 smp_wmb();
1435         } else
1436                 status = data->rpc_status;
1437         rpc_put_task(task);
1438         if (status != 0 || !data->rpc_done)
1439                 return status;
1440
1441         if (o_res->fh.size == 0)
1442                 _nfs4_proc_lookup(dir, o_arg->name, &o_res->fh, o_res->f_attr);
1443
1444         if (o_arg->open_flags & O_CREAT) {
1445                 update_changeattr(dir, &o_res->cinfo);
1446                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1447         } else
1448                 nfs_refresh_inode(dir, o_res->dir_attr);
1449         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1450                 status = _nfs4_proc_open_confirm(data);
1451                 if (status != 0)
1452                         return status;
1453         }
1454         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1455                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1456         return 0;
1457 }
1458
1459 static int nfs4_recover_expired_lease(struct nfs_server *server)
1460 {
1461         struct nfs_client *clp = server->nfs_client;
1462         unsigned int loop;
1463         int ret;
1464
1465         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1466                 ret = nfs4_wait_clnt_recover(clp);
1467                 if (ret != 0)
1468                         break;
1469                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1470                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1471                         break;
1472                 nfs4_schedule_state_recovery(clp);
1473                 ret = -EIO;
1474         }
1475         return ret;
1476 }
1477
1478 /*
1479  * OPEN_EXPIRED:
1480  *      reclaim state on the server after a network partition.
1481  *      Assumes caller holds the appropriate lock
1482  */
1483 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1484 {
1485         struct nfs4_opendata *opendata;
1486         int ret;
1487
1488         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1489         if (IS_ERR(opendata))
1490                 return PTR_ERR(opendata);
1491         ret = nfs4_open_recover(opendata, state);
1492         if (ret == -ESTALE)
1493                 d_drop(ctx->path.dentry);
1494         nfs4_opendata_put(opendata);
1495         return ret;
1496 }
1497
1498 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1499 {
1500         struct nfs_server *server = NFS_SERVER(state->inode);
1501         struct nfs4_exception exception = { };
1502         int err;
1503
1504         do {
1505                 err = _nfs4_open_expired(ctx, state);
1506                 switch (err) {
1507                 default:
1508                         goto out;
1509                 case -NFS4ERR_GRACE:
1510                 case -NFS4ERR_DELAY:
1511                         nfs4_handle_exception(server, err, &exception);
1512                         err = 0;
1513                 }
1514         } while (exception.retry);
1515 out:
1516         return err;
1517 }
1518
1519 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1520 {
1521         struct nfs_open_context *ctx;
1522         int ret;
1523
1524         ctx = nfs4_state_find_open_context(state);
1525         if (IS_ERR(ctx))
1526                 return PTR_ERR(ctx);
1527         ret = nfs4_do_open_expired(ctx, state);
1528         put_nfs_open_context(ctx);
1529         return ret;
1530 }
1531
1532 /*
1533  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1534  * fields corresponding to attributes that were used to store the verifier.
1535  * Make sure we clobber those fields in the later setattr call
1536  */
1537 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1538 {
1539         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1540             !(sattr->ia_valid & ATTR_ATIME_SET))
1541                 sattr->ia_valid |= ATTR_ATIME;
1542
1543         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1544             !(sattr->ia_valid & ATTR_MTIME_SET))
1545                 sattr->ia_valid |= ATTR_MTIME;
1546 }
1547
1548 /*
1549  * Returns a referenced nfs4_state
1550  */
1551 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)
1552 {
1553         struct nfs4_state_owner  *sp;
1554         struct nfs4_state     *state = NULL;
1555         struct nfs_server       *server = NFS_SERVER(dir);
1556         struct nfs4_opendata *opendata;
1557         int status;
1558
1559         /* Protect against reboot recovery conflicts */
1560         status = -ENOMEM;
1561         if (!(sp = nfs4_get_state_owner(server, cred))) {
1562                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1563                 goto out_err;
1564         }
1565         status = nfs4_recover_expired_lease(server);
1566         if (status != 0)
1567                 goto err_put_state_owner;
1568         if (path->dentry->d_inode != NULL)
1569                 nfs4_return_incompatible_delegation(path->dentry->d_inode, fmode);
1570         status = -ENOMEM;
1571         opendata = nfs4_opendata_alloc(path, sp, fmode, flags, sattr);
1572         if (opendata == NULL)
1573                 goto err_put_state_owner;
1574
1575         if (path->dentry->d_inode != NULL)
1576                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1577
1578         status = _nfs4_proc_open(opendata);
1579         if (status != 0)
1580                 goto err_opendata_put;
1581
1582         if (opendata->o_arg.open_flags & O_EXCL)
1583                 nfs4_exclusive_attrset(opendata, sattr);
1584
1585         state = nfs4_opendata_to_nfs4_state(opendata);
1586         status = PTR_ERR(state);
1587         if (IS_ERR(state))
1588                 goto err_opendata_put;
1589         nfs4_opendata_put(opendata);
1590         nfs4_put_state_owner(sp);
1591         *res = state;
1592         return 0;
1593 err_opendata_put:
1594         nfs4_opendata_put(opendata);
1595 err_put_state_owner:
1596         nfs4_put_state_owner(sp);
1597 out_err:
1598         *res = NULL;
1599         return status;
1600 }
1601
1602
1603 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)
1604 {
1605         struct nfs4_exception exception = { };
1606         struct nfs4_state *res;
1607         int status;
1608
1609         do {
1610                 status = _nfs4_do_open(dir, path, fmode, flags, sattr, cred, &res);
1611                 if (status == 0)
1612                         break;
1613                 /* NOTE: BAD_SEQID means the server and client disagree about the
1614                  * book-keeping w.r.t. state-changing operations
1615                  * (OPEN/CLOSE/LOCK/LOCKU...)
1616                  * It is actually a sign of a bug on the client or on the server.
1617                  *
1618                  * If we receive a BAD_SEQID error in the particular case of
1619                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1620                  * have unhashed the old state_owner for us, and that we can
1621                  * therefore safely retry using a new one. We should still warn
1622                  * the user though...
1623                  */
1624                 if (status == -NFS4ERR_BAD_SEQID) {
1625                         printk(KERN_WARNING "NFS: v4 server %s "
1626                                         " returned a bad sequence-id error!\n",
1627                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1628                         exception.retry = 1;
1629                         continue;
1630                 }
1631                 /*
1632                  * BAD_STATEID on OPEN means that the server cancelled our
1633                  * state before it received the OPEN_CONFIRM.
1634                  * Recover by retrying the request as per the discussion
1635                  * on Page 181 of RFC3530.
1636                  */
1637                 if (status == -NFS4ERR_BAD_STATEID) {
1638                         exception.retry = 1;
1639                         continue;
1640                 }
1641                 if (status == -EAGAIN) {
1642                         /* We must have found a delegation */
1643                         exception.retry = 1;
1644                         continue;
1645                 }
1646                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1647                                         status, &exception));
1648         } while (exception.retry);
1649         return res;
1650 }
1651
1652 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1653                             struct nfs_fattr *fattr, struct iattr *sattr,
1654                             struct nfs4_state *state)
1655 {
1656         struct nfs_server *server = NFS_SERVER(inode);
1657         struct nfs_setattrargs  arg = {
1658                 .fh             = NFS_FH(inode),
1659                 .iap            = sattr,
1660                 .server         = server,
1661                 .bitmask = server->attr_bitmask,
1662         };
1663         struct nfs_setattrres  res = {
1664                 .fattr          = fattr,
1665                 .server         = server,
1666         };
1667         struct rpc_message msg = {
1668                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1669                 .rpc_argp       = &arg,
1670                 .rpc_resp       = &res,
1671                 .rpc_cred       = cred,
1672         };
1673         unsigned long timestamp = jiffies;
1674         int status;
1675
1676         nfs_fattr_init(fattr);
1677
1678         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1679                 /* Use that stateid */
1680         } else if (state != NULL) {
1681                 nfs4_copy_stateid(&arg.stateid, state, current->files);
1682         } else
1683                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1684
1685         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
1686         if (status == 0 && state != NULL)
1687                 renew_lease(server, timestamp);
1688         return status;
1689 }
1690
1691 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1692                            struct nfs_fattr *fattr, struct iattr *sattr,
1693                            struct nfs4_state *state)
1694 {
1695         struct nfs_server *server = NFS_SERVER(inode);
1696         struct nfs4_exception exception = { };
1697         int err;
1698         do {
1699                 err = nfs4_handle_exception(server,
1700                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1701                                 &exception);
1702         } while (exception.retry);
1703         return err;
1704 }
1705
1706 struct nfs4_closedata {
1707         struct path path;
1708         struct inode *inode;
1709         struct nfs4_state *state;
1710         struct nfs_closeargs arg;
1711         struct nfs_closeres res;
1712         struct nfs_fattr fattr;
1713         unsigned long timestamp;
1714 };
1715
1716 static void nfs4_free_closedata(void *data)
1717 {
1718         struct nfs4_closedata *calldata = data;
1719         struct nfs4_state_owner *sp = calldata->state->owner;
1720
1721         nfs4_put_open_state(calldata->state);
1722         nfs_free_seqid(calldata->arg.seqid);
1723         nfs4_put_state_owner(sp);
1724         path_put(&calldata->path);
1725         kfree(calldata);
1726 }
1727
1728 static void nfs4_close_done(struct rpc_task *task, void *data)
1729 {
1730         struct nfs4_closedata *calldata = data;
1731         struct nfs4_state *state = calldata->state;
1732         struct nfs_server *server = NFS_SERVER(calldata->inode);
1733
1734         nfs4_sequence_done(server, &calldata->res.seq_res, task->tk_status);
1735         if (RPC_ASSASSINATED(task))
1736                 return;
1737         /* hmm. we are done with the inode, and in the process of freeing
1738          * the state_owner. we keep this around to process errors
1739          */
1740         switch (task->tk_status) {
1741                 case 0:
1742                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1743                         renew_lease(server, calldata->timestamp);
1744                         break;
1745                 case -NFS4ERR_STALE_STATEID:
1746                 case -NFS4ERR_OLD_STATEID:
1747                 case -NFS4ERR_BAD_STATEID:
1748                 case -NFS4ERR_EXPIRED:
1749                         if (calldata->arg.fmode == 0)
1750                                 break;
1751                 default:
1752                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN) {
1753                                 nfs4_restart_rpc(task, server->nfs_client);
1754                                 return;
1755                         }
1756         }
1757         nfs4_sequence_free_slot(server->nfs_client, &calldata->res.seq_res);
1758         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1759 }
1760
1761 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1762 {
1763         struct nfs4_closedata *calldata = data;
1764         struct nfs4_state *state = calldata->state;
1765         int clear_rd, clear_wr, clear_rdwr;
1766
1767         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1768                 return;
1769
1770         clear_rd = clear_wr = clear_rdwr = 0;
1771         spin_lock(&state->owner->so_lock);
1772         /* Calculate the change in open mode */
1773         if (state->n_rdwr == 0) {
1774                 if (state->n_rdonly == 0) {
1775                         clear_rd |= test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1776                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1777                 }
1778                 if (state->n_wronly == 0) {
1779                         clear_wr |= test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1780                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1781                 }
1782         }
1783         spin_unlock(&state->owner->so_lock);
1784         if (!clear_rd && !clear_wr && !clear_rdwr) {
1785                 /* Note: exit _without_ calling nfs4_close_done */
1786                 task->tk_action = NULL;
1787                 return;
1788         }
1789         nfs_fattr_init(calldata->res.fattr);
1790         if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0) {
1791                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1792                 calldata->arg.fmode = FMODE_READ;
1793         } else if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0) {
1794                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1795                 calldata->arg.fmode = FMODE_WRITE;
1796         }
1797         calldata->timestamp = jiffies;
1798         if (nfs4_setup_sequence((NFS_SERVER(calldata->inode))->nfs_client,
1799                                 &calldata->arg.seq_args, &calldata->res.seq_res,
1800                                 1, task))
1801                 return;
1802         rpc_call_start(task);
1803 }
1804
1805 static const struct rpc_call_ops nfs4_close_ops = {
1806         .rpc_call_prepare = nfs4_close_prepare,
1807         .rpc_call_done = nfs4_close_done,
1808         .rpc_release = nfs4_free_closedata,
1809 };
1810
1811 /* 
1812  * It is possible for data to be read/written from a mem-mapped file 
1813  * after the sys_close call (which hits the vfs layer as a flush).
1814  * This means that we can't safely call nfsv4 close on a file until 
1815  * the inode is cleared. This in turn means that we are not good
1816  * NFSv4 citizens - we do not indicate to the server to update the file's 
1817  * share state even when we are done with one of the three share 
1818  * stateid's in the inode.
1819  *
1820  * NOTE: Caller must be holding the sp->so_owner semaphore!
1821  */
1822 int nfs4_do_close(struct path *path, struct nfs4_state *state, int wait)
1823 {
1824         struct nfs_server *server = NFS_SERVER(state->inode);
1825         struct nfs4_closedata *calldata;
1826         struct nfs4_state_owner *sp = state->owner;
1827         struct rpc_task *task;
1828         struct rpc_message msg = {
1829                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1830                 .rpc_cred = state->owner->so_cred,
1831         };
1832         struct rpc_task_setup task_setup_data = {
1833                 .rpc_client = server->client,
1834                 .rpc_message = &msg,
1835                 .callback_ops = &nfs4_close_ops,
1836                 .workqueue = nfsiod_workqueue,
1837                 .flags = RPC_TASK_ASYNC,
1838         };
1839         int status = -ENOMEM;
1840
1841         calldata = kzalloc(sizeof(*calldata), GFP_KERNEL);
1842         if (calldata == NULL)
1843                 goto out;
1844         calldata->inode = state->inode;
1845         calldata->state = state;
1846         calldata->arg.fh = NFS_FH(state->inode);
1847         calldata->arg.stateid = &state->open_stateid;
1848         if (nfs4_has_session(server->nfs_client))
1849                 memset(calldata->arg.stateid->data, 0, 4);    /* clear seqid */
1850         /* Serialization for the sequence id */
1851         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1852         if (calldata->arg.seqid == NULL)
1853                 goto out_free_calldata;
1854         calldata->arg.fmode = 0;
1855         calldata->arg.bitmask = server->cache_consistency_bitmask;
1856         calldata->res.fattr = &calldata->fattr;
1857         calldata->res.seqid = calldata->arg.seqid;
1858         calldata->res.server = server;
1859         calldata->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
1860         calldata->path.mnt = mntget(path->mnt);
1861         calldata->path.dentry = dget(path->dentry);
1862
1863         msg.rpc_argp = &calldata->arg,
1864         msg.rpc_resp = &calldata->res,
1865         task_setup_data.callback_data = calldata;
1866         task = rpc_run_task(&task_setup_data);
1867         if (IS_ERR(task))
1868                 return PTR_ERR(task);
1869         status = 0;
1870         if (wait)
1871                 status = rpc_wait_for_completion_task(task);
1872         rpc_put_task(task);
1873         return status;
1874 out_free_calldata:
1875         kfree(calldata);
1876 out:
1877         nfs4_put_open_state(state);
1878         nfs4_put_state_owner(sp);
1879         return status;
1880 }
1881
1882 static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state, fmode_t fmode)
1883 {
1884         struct file *filp;
1885         int ret;
1886
1887         /* If the open_intent is for execute, we have an extra check to make */
1888         if (fmode & FMODE_EXEC) {
1889                 ret = nfs_may_open(state->inode,
1890                                 state->owner->so_cred,
1891                                 nd->intent.open.flags);
1892                 if (ret < 0)
1893                         goto out_close;
1894         }
1895         filp = lookup_instantiate_filp(nd, path->dentry, NULL);
1896         if (!IS_ERR(filp)) {
1897                 struct nfs_open_context *ctx;
1898                 ctx = nfs_file_open_context(filp);
1899                 ctx->state = state;
1900                 return 0;
1901         }
1902         ret = PTR_ERR(filp);
1903 out_close:
1904         nfs4_close_sync(path, state, fmode & (FMODE_READ|FMODE_WRITE));
1905         return ret;
1906 }
1907
1908 struct dentry *
1909 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1910 {
1911         struct path path = {
1912                 .mnt = nd->path.mnt,
1913                 .dentry = dentry,
1914         };
1915         struct dentry *parent;
1916         struct iattr attr;
1917         struct rpc_cred *cred;
1918         struct nfs4_state *state;
1919         struct dentry *res;
1920         fmode_t fmode = nd->intent.open.flags & (FMODE_READ | FMODE_WRITE | FMODE_EXEC);
1921
1922         if (nd->flags & LOOKUP_CREATE) {
1923                 attr.ia_mode = nd->intent.open.create_mode;
1924                 attr.ia_valid = ATTR_MODE;
1925                 if (!IS_POSIXACL(dir))
1926                         attr.ia_mode &= ~current_umask();
1927         } else {
1928                 attr.ia_valid = 0;
1929                 BUG_ON(nd->intent.open.flags & O_CREAT);
1930         }
1931
1932         cred = rpc_lookup_cred();
1933         if (IS_ERR(cred))
1934                 return (struct dentry *)cred;
1935         parent = dentry->d_parent;
1936         /* Protect against concurrent sillydeletes */
1937         nfs_block_sillyrename(parent);
1938         state = nfs4_do_open(dir, &path, fmode, nd->intent.open.flags, &attr, cred);
1939         put_rpccred(cred);
1940         if (IS_ERR(state)) {
1941                 if (PTR_ERR(state) == -ENOENT) {
1942                         d_add(dentry, NULL);
1943                         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1944                 }
1945                 nfs_unblock_sillyrename(parent);
1946                 return (struct dentry *)state;
1947         }
1948         res = d_add_unique(dentry, igrab(state->inode));
1949         if (res != NULL)
1950                 path.dentry = res;
1951         nfs_set_verifier(path.dentry, nfs_save_change_attribute(dir));
1952         nfs_unblock_sillyrename(parent);
1953         nfs4_intent_set_file(nd, &path, state, fmode);
1954         return res;
1955 }
1956
1957 int
1958 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1959 {
1960         struct path path = {
1961                 .mnt = nd->path.mnt,
1962                 .dentry = dentry,
1963         };
1964         struct rpc_cred *cred;
1965         struct nfs4_state *state;
1966         fmode_t fmode = openflags & (FMODE_READ | FMODE_WRITE);
1967
1968         cred = rpc_lookup_cred();
1969         if (IS_ERR(cred))
1970                 return PTR_ERR(cred);
1971         state = nfs4_do_open(dir, &path, fmode, openflags, NULL, cred);
1972         put_rpccred(cred);
1973         if (IS_ERR(state)) {
1974                 switch (PTR_ERR(state)) {
1975                         case -EPERM:
1976                         case -EACCES:
1977                         case -EDQUOT:
1978                         case -ENOSPC:
1979                         case -EROFS:
1980                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1981                                 return 1;
1982                         default:
1983                                 goto out_drop;
1984                 }
1985         }
1986         if (state->inode == dentry->d_inode) {
1987                 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1988                 nfs4_intent_set_file(nd, &path, state, fmode);
1989                 return 1;
1990         }
1991         nfs4_close_sync(&path, state, fmode);
1992 out_drop:
1993         d_drop(dentry);
1994         return 0;
1995 }
1996
1997 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
1998 {
1999         if (ctx->state == NULL)
2000                 return;
2001         if (is_sync)
2002                 nfs4_close_sync(&ctx->path, ctx->state, ctx->mode);
2003         else
2004                 nfs4_close_state(&ctx->path, ctx->state, ctx->mode);
2005 }
2006
2007 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2008 {
2009         struct nfs4_server_caps_arg args = {
2010                 .fhandle = fhandle,
2011         };
2012         struct nfs4_server_caps_res res = {};
2013         struct rpc_message msg = {
2014                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2015                 .rpc_argp = &args,
2016                 .rpc_resp = &res,
2017         };
2018         int status;
2019
2020         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2021         if (status == 0) {
2022                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2023                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2024                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2025                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2026                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2027                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2028                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2029                         server->caps |= NFS_CAP_ACLS;
2030                 if (res.has_links != 0)
2031                         server->caps |= NFS_CAP_HARDLINKS;
2032                 if (res.has_symlinks != 0)
2033                         server->caps |= NFS_CAP_SYMLINKS;
2034                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2035                         server->caps |= NFS_CAP_FILEID;
2036                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2037                         server->caps |= NFS_CAP_MODE;
2038                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2039                         server->caps |= NFS_CAP_NLINK;
2040                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2041                         server->caps |= NFS_CAP_OWNER;
2042                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2043                         server->caps |= NFS_CAP_OWNER_GROUP;
2044                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2045                         server->caps |= NFS_CAP_ATIME;
2046                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2047                         server->caps |= NFS_CAP_CTIME;
2048                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2049                         server->caps |= NFS_CAP_MTIME;
2050
2051                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2052                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2053                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2054                 server->acl_bitmask = res.acl_bitmask;
2055         }
2056
2057         return status;
2058 }
2059
2060 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2061 {
2062         struct nfs4_exception exception = { };
2063         int err;
2064         do {
2065                 err = nfs4_handle_exception(server,
2066                                 _nfs4_server_capabilities(server, fhandle),
2067                                 &exception);
2068         } while (exception.retry);
2069         return err;
2070 }
2071
2072 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2073                 struct nfs_fsinfo *info)
2074 {
2075         struct nfs4_lookup_root_arg args = {
2076                 .bitmask = nfs4_fattr_bitmap,
2077         };
2078         struct nfs4_lookup_res res = {
2079                 .server = server,
2080                 .fattr = info->fattr,
2081                 .fh = fhandle,
2082         };
2083         struct rpc_message msg = {
2084                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2085                 .rpc_argp = &args,
2086                 .rpc_resp = &res,
2087         };
2088
2089         nfs_fattr_init(info->fattr);
2090         return nfs4_call_sync(server, &msg, &args, &res, 0);
2091 }
2092
2093 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2094                 struct nfs_fsinfo *info)
2095 {
2096         struct nfs4_exception exception = { };
2097         int err;
2098         do {
2099                 err = nfs4_handle_exception(server,
2100                                 _nfs4_lookup_root(server, fhandle, info),
2101                                 &exception);
2102         } while (exception.retry);
2103         return err;
2104 }
2105
2106 /*
2107  * get the file handle for the "/" directory on the server
2108  */
2109 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2110                               struct nfs_fsinfo *info)
2111 {
2112         int status;
2113
2114         status = nfs4_lookup_root(server, fhandle, info);
2115         if (status == 0)
2116                 status = nfs4_server_capabilities(server, fhandle);
2117         if (status == 0)
2118                 status = nfs4_do_fsinfo(server, fhandle, info);
2119         return nfs4_map_errors(status);
2120 }
2121
2122 /*
2123  * Get locations and (maybe) other attributes of a referral.
2124  * Note that we'll actually follow the referral later when
2125  * we detect fsid mismatch in inode revalidation
2126  */
2127 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2128 {
2129         int status = -ENOMEM;
2130         struct page *page = NULL;
2131         struct nfs4_fs_locations *locations = NULL;
2132
2133         page = alloc_page(GFP_KERNEL);
2134         if (page == NULL)
2135                 goto out;
2136         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2137         if (locations == NULL)
2138                 goto out;
2139
2140         status = nfs4_proc_fs_locations(dir, name, locations, page);
2141         if (status != 0)
2142                 goto out;
2143         /* Make sure server returned a different fsid for the referral */
2144         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2145                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __func__, name->name);
2146                 status = -EIO;
2147                 goto out;
2148         }
2149
2150         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2151         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
2152         if (!fattr->mode)
2153                 fattr->mode = S_IFDIR;
2154         memset(fhandle, 0, sizeof(struct nfs_fh));
2155 out:
2156         if (page)
2157                 __free_page(page);
2158         if (locations)
2159                 kfree(locations);
2160         return status;
2161 }
2162
2163 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2164 {
2165         struct nfs4_getattr_arg args = {
2166                 .fh = fhandle,
2167                 .bitmask = server->attr_bitmask,
2168         };
2169         struct nfs4_getattr_res res = {
2170                 .fattr = fattr,
2171                 .server = server,
2172         };
2173         struct rpc_message msg = {
2174                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2175                 .rpc_argp = &args,
2176                 .rpc_resp = &res,
2177         };
2178         
2179         nfs_fattr_init(fattr);
2180         return nfs4_call_sync(server, &msg, &args, &res, 0);
2181 }
2182
2183 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2184 {
2185         struct nfs4_exception exception = { };
2186         int err;
2187         do {
2188                 err = nfs4_handle_exception(server,
2189                                 _nfs4_proc_getattr(server, fhandle, fattr),
2190                                 &exception);
2191         } while (exception.retry);
2192         return err;
2193 }
2194
2195 /* 
2196  * The file is not closed if it is opened due to the a request to change
2197  * the size of the file. The open call will not be needed once the
2198  * VFS layer lookup-intents are implemented.
2199  *
2200  * Close is called when the inode is destroyed.
2201  * If we haven't opened the file for O_WRONLY, we
2202  * need to in the size_change case to obtain a stateid.
2203  *
2204  * Got race?
2205  * Because OPEN is always done by name in nfsv4, it is
2206  * possible that we opened a different file by the same
2207  * name.  We can recognize this race condition, but we
2208  * can't do anything about it besides returning an error.
2209  *
2210  * This will be fixed with VFS changes (lookup-intent).
2211  */
2212 static int
2213 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2214                   struct iattr *sattr)
2215 {
2216         struct inode *inode = dentry->d_inode;
2217         struct rpc_cred *cred = NULL;
2218         struct nfs4_state *state = NULL;
2219         int status;
2220
2221         nfs_fattr_init(fattr);
2222         
2223         /* Search for an existing open(O_WRITE) file */
2224         if (sattr->ia_valid & ATTR_FILE) {
2225                 struct nfs_open_context *ctx;
2226
2227                 ctx = nfs_file_open_context(sattr->ia_file);
2228                 if (ctx) {
2229                         cred = ctx->cred;
2230                         state = ctx->state;
2231                 }
2232         }
2233
2234         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2235         if (status == 0)
2236                 nfs_setattr_update_inode(inode, sattr);
2237         return status;
2238 }
2239
2240 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
2241                 const struct qstr *name, struct nfs_fh *fhandle,
2242                 struct nfs_fattr *fattr)
2243 {
2244         int                    status;
2245         struct nfs4_lookup_arg args = {
2246                 .bitmask = server->attr_bitmask,
2247                 .dir_fh = dirfh,
2248                 .name = name,
2249         };
2250         struct nfs4_lookup_res res = {
2251                 .server = server,
2252                 .fattr = fattr,
2253                 .fh = fhandle,
2254         };
2255         struct rpc_message msg = {
2256                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2257                 .rpc_argp = &args,
2258                 .rpc_resp = &res,
2259         };
2260
2261         nfs_fattr_init(fattr);
2262
2263         dprintk("NFS call  lookupfh %s\n", name->name);
2264         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2265         dprintk("NFS reply lookupfh: %d\n", status);
2266         return status;
2267 }
2268
2269 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
2270                               struct qstr *name, struct nfs_fh *fhandle,
2271                               struct nfs_fattr *fattr)
2272 {
2273         struct nfs4_exception exception = { };
2274         int err;
2275         do {
2276                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
2277                 /* FIXME: !!!! */
2278                 if (err == -NFS4ERR_MOVED) {
2279                         err = -EREMOTE;
2280                         break;
2281                 }
2282                 err = nfs4_handle_exception(server, err, &exception);
2283         } while (exception.retry);
2284         return err;
2285 }
2286
2287 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
2288                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2289 {
2290         int status;
2291         
2292         dprintk("NFS call  lookup %s\n", name->name);
2293         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
2294         if (status == -NFS4ERR_MOVED)
2295                 status = nfs4_get_referral(dir, name, fattr, fhandle);
2296         dprintk("NFS reply lookup: %d\n", status);
2297         return status;
2298 }
2299
2300 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2301 {
2302         struct nfs4_exception exception = { };
2303         int err;
2304         do {
2305                 err = nfs4_handle_exception(NFS_SERVER(dir),
2306                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
2307                                 &exception);
2308         } while (exception.retry);
2309         return err;
2310 }
2311
2312 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2313 {
2314         struct nfs_server *server = NFS_SERVER(inode);
2315         struct nfs_fattr fattr;
2316         struct nfs4_accessargs args = {
2317                 .fh = NFS_FH(inode),
2318                 .bitmask = server->attr_bitmask,
2319         };
2320         struct nfs4_accessres res = {
2321                 .server = server,
2322                 .fattr = &fattr,
2323         };
2324         struct rpc_message msg = {
2325                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2326                 .rpc_argp = &args,
2327                 .rpc_resp = &res,
2328                 .rpc_cred = entry->cred,
2329         };
2330         int mode = entry->mask;
2331         int status;
2332
2333         /*
2334          * Determine which access bits we want to ask for...
2335          */
2336         if (mode & MAY_READ)
2337                 args.access |= NFS4_ACCESS_READ;
2338         if (S_ISDIR(inode->i_mode)) {
2339                 if (mode & MAY_WRITE)
2340                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2341                 if (mode & MAY_EXEC)
2342                         args.access |= NFS4_ACCESS_LOOKUP;
2343         } else {
2344                 if (mode & MAY_WRITE)
2345                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2346                 if (mode & MAY_EXEC)
2347                         args.access |= NFS4_ACCESS_EXECUTE;
2348         }
2349         nfs_fattr_init(&fattr);
2350         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2351         if (!status) {
2352                 entry->mask = 0;
2353                 if (res.access & NFS4_ACCESS_READ)
2354                         entry->mask |= MAY_READ;
2355                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2356                         entry->mask |= MAY_WRITE;
2357                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2358                         entry->mask |= MAY_EXEC;
2359                 nfs_refresh_inode(inode, &fattr);
2360         }
2361         return status;
2362 }
2363
2364 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2365 {
2366         struct nfs4_exception exception = { };
2367         int err;
2368         do {
2369                 err = nfs4_handle_exception(NFS_SERVER(inode),
2370                                 _nfs4_proc_access(inode, entry),
2371                                 &exception);
2372         } while (exception.retry);
2373         return err;
2374 }
2375
2376 /*
2377  * TODO: For the time being, we don't try to get any attributes
2378  * along with any of the zero-copy operations READ, READDIR,
2379  * READLINK, WRITE.
2380  *
2381  * In the case of the first three, we want to put the GETATTR
2382  * after the read-type operation -- this is because it is hard
2383  * to predict the length of a GETATTR response in v4, and thus
2384  * align the READ data correctly.  This means that the GETATTR
2385  * may end up partially falling into the page cache, and we should
2386  * shift it into the 'tail' of the xdr_buf before processing.
2387  * To do this efficiently, we need to know the total length
2388  * of data received, which doesn't seem to be available outside
2389  * of the RPC layer.
2390  *
2391  * In the case of WRITE, we also want to put the GETATTR after
2392  * the operation -- in this case because we want to make sure
2393  * we get the post-operation mtime and size.  This means that
2394  * we can't use xdr_encode_pages() as written: we need a variant
2395  * of it which would leave room in the 'tail' iovec.
2396  *
2397  * Both of these changes to the XDR layer would in fact be quite
2398  * minor, but I decided to leave them for a subsequent patch.
2399  */
2400 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2401                 unsigned int pgbase, unsigned int pglen)
2402 {
2403         struct nfs4_readlink args = {
2404                 .fh       = NFS_FH(inode),
2405                 .pgbase   = pgbase,
2406                 .pglen    = pglen,
2407                 .pages    = &page,
2408         };
2409         struct nfs4_readlink_res res;
2410         struct rpc_message msg = {
2411                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2412                 .rpc_argp = &args,
2413                 .rpc_resp = &res,
2414         };
2415
2416         return nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
2417 }
2418
2419 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2420                 unsigned int pgbase, unsigned int pglen)
2421 {
2422         struct nfs4_exception exception = { };
2423         int err;
2424         do {
2425                 err = nfs4_handle_exception(NFS_SERVER(inode),
2426                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2427                                 &exception);
2428         } while (exception.retry);
2429         return err;
2430 }
2431
2432 /*
2433  * Got race?
2434  * We will need to arrange for the VFS layer to provide an atomic open.
2435  * Until then, this create/open method is prone to inefficiency and race
2436  * conditions due to the lookup, create, and open VFS calls from sys_open()
2437  * placed on the wire.
2438  *
2439  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2440  * The file will be opened again in the subsequent VFS open call
2441  * (nfs4_proc_file_open).
2442  *
2443  * The open for read will just hang around to be used by any process that
2444  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2445  */
2446
2447 static int
2448 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2449                  int flags, struct nameidata *nd)
2450 {
2451         struct path path = {
2452                 .mnt = nd->path.mnt,
2453                 .dentry = dentry,
2454         };
2455         struct nfs4_state *state;
2456         struct rpc_cred *cred;
2457         fmode_t fmode = flags & (FMODE_READ | FMODE_WRITE);
2458         int status = 0;
2459
2460         cred = rpc_lookup_cred();
2461         if (IS_ERR(cred)) {
2462                 status = PTR_ERR(cred);
2463                 goto out;
2464         }
2465         state = nfs4_do_open(dir, &path, fmode, flags, sattr, cred);
2466         d_drop(dentry);
2467         if (IS_ERR(state)) {
2468                 status = PTR_ERR(state);
2469                 goto out_putcred;
2470         }
2471         d_add(dentry, igrab(state->inode));
2472         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2473         if (flags & O_EXCL) {
2474                 struct nfs_fattr fattr;
2475                 status = nfs4_do_setattr(state->inode, cred, &fattr, sattr, state);
2476                 if (status == 0)
2477                         nfs_setattr_update_inode(state->inode, sattr);
2478                 nfs_post_op_update_inode(state->inode, &fattr);
2479         }
2480         if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
2481                 status = nfs4_intent_set_file(nd, &path, state, fmode);
2482         else
2483                 nfs4_close_sync(&path, state, fmode);
2484 out_putcred:
2485         put_rpccred(cred);
2486 out:
2487         return status;
2488 }
2489
2490 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2491 {
2492         struct nfs_server *server = NFS_SERVER(dir);
2493         struct nfs_removeargs args = {
2494                 .fh = NFS_FH(dir),
2495                 .name.len = name->len,
2496                 .name.name = name->name,
2497                 .bitmask = server->attr_bitmask,
2498         };
2499         struct nfs_removeres res = {
2500                 .server = server,
2501         };
2502         struct rpc_message msg = {
2503                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2504                 .rpc_argp = &args,
2505                 .rpc_resp = &res,
2506         };
2507         int                     status;
2508
2509         nfs_fattr_init(&res.dir_attr);
2510         status = nfs4_call_sync(server, &msg, &args, &res, 1);
2511         if (status == 0) {
2512                 update_changeattr(dir, &res.cinfo);
2513                 nfs_post_op_update_inode(dir, &res.dir_attr);
2514         }
2515         return status;
2516 }
2517
2518 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2519 {
2520         struct nfs4_exception exception = { };
2521         int err;
2522         do {
2523                 err = nfs4_handle_exception(NFS_SERVER(dir),
2524                                 _nfs4_proc_remove(dir, name),
2525                                 &exception);
2526         } while (exception.retry);
2527         return err;
2528 }
2529
2530 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2531 {
2532         struct nfs_server *server = NFS_SERVER(dir);
2533         struct nfs_removeargs *args = msg->rpc_argp;
2534         struct nfs_removeres *res = msg->rpc_resp;
2535
2536         args->bitmask = server->cache_consistency_bitmask;
2537         res->server = server;
2538         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2539 }
2540
2541 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2542 {
2543         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2544
2545         nfs4_sequence_done(res->server, &res->seq_res, task->tk_status);
2546         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2547                 return 0;
2548         nfs4_sequence_free_slot(res->server->nfs_client, &res->seq_res);
2549         update_changeattr(dir, &res->cinfo);
2550         nfs_post_op_update_inode(dir, &res->dir_attr);
2551         return 1;
2552 }
2553
2554 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2555                 struct inode *new_dir, struct qstr *new_name)
2556 {
2557         struct nfs_server *server = NFS_SERVER(old_dir);
2558         struct nfs4_rename_arg arg = {
2559                 .old_dir = NFS_FH(old_dir),
2560                 .new_dir = NFS_FH(new_dir),
2561                 .old_name = old_name,
2562                 .new_name = new_name,
2563                 .bitmask = server->attr_bitmask,
2564         };
2565         struct nfs_fattr old_fattr, new_fattr;
2566         struct nfs4_rename_res res = {
2567                 .server = server,
2568                 .old_fattr = &old_fattr,
2569                 .new_fattr = &new_fattr,
2570         };
2571         struct rpc_message msg = {
2572                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2573                 .rpc_argp = &arg,
2574                 .rpc_resp = &res,
2575         };
2576         int                     status;
2577         
2578         nfs_fattr_init(res.old_fattr);
2579         nfs_fattr_init(res.new_fattr);
2580         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2581
2582         if (!status) {
2583                 update_changeattr(old_dir, &res.old_cinfo);
2584                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2585                 update_changeattr(new_dir, &res.new_cinfo);
2586                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2587         }
2588         return status;
2589 }
2590
2591 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2592                 struct inode *new_dir, struct qstr *new_name)
2593 {
2594         struct nfs4_exception exception = { };
2595         int err;
2596         do {
2597                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2598                                 _nfs4_proc_rename(old_dir, old_name,
2599                                         new_dir, new_name),
2600                                 &exception);
2601         } while (exception.retry);
2602         return err;
2603 }
2604
2605 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2606 {
2607         struct nfs_server *server = NFS_SERVER(inode);
2608         struct nfs4_link_arg arg = {
2609                 .fh     = NFS_FH(inode),
2610                 .dir_fh = NFS_FH(dir),
2611                 .name   = name,
2612                 .bitmask = server->attr_bitmask,
2613         };
2614         struct nfs_fattr fattr, dir_attr;
2615         struct nfs4_link_res res = {
2616                 .server = server,
2617                 .fattr = &fattr,
2618                 .dir_attr = &dir_attr,
2619         };
2620         struct rpc_message msg = {
2621                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2622                 .rpc_argp = &arg,
2623                 .rpc_resp = &res,
2624         };
2625         int                     status;
2626
2627         nfs_fattr_init(res.fattr);
2628         nfs_fattr_init(res.dir_attr);
2629         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2630         if (!status) {
2631                 update_changeattr(dir, &res.cinfo);
2632                 nfs_post_op_update_inode(dir, res.dir_attr);
2633                 nfs_post_op_update_inode(inode, res.fattr);
2634         }
2635
2636         return status;
2637 }
2638
2639 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2640 {
2641         struct nfs4_exception exception = { };
2642         int err;
2643         do {
2644                 err = nfs4_handle_exception(NFS_SERVER(inode),
2645                                 _nfs4_proc_link(inode, dir, name),
2646                                 &exception);
2647         } while (exception.retry);
2648         return err;
2649 }
2650
2651 struct nfs4_createdata {
2652         struct rpc_message msg;
2653         struct nfs4_create_arg arg;
2654         struct nfs4_create_res res;
2655         struct nfs_fh fh;
2656         struct nfs_fattr fattr;
2657         struct nfs_fattr dir_fattr;
2658 };
2659
2660 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2661                 struct qstr *name, struct iattr *sattr, u32 ftype)
2662 {
2663         struct nfs4_createdata *data;
2664
2665         data = kzalloc(sizeof(*data), GFP_KERNEL);
2666         if (data != NULL) {
2667                 struct nfs_server *server = NFS_SERVER(dir);
2668
2669                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2670                 data->msg.rpc_argp = &data->arg;
2671                 data->msg.rpc_resp = &data->res;
2672                 data->arg.dir_fh = NFS_FH(dir);
2673                 data->arg.server = server;
2674                 data->arg.name = name;
2675                 data->arg.attrs = sattr;
2676                 data->arg.ftype = ftype;
2677                 data->arg.bitmask = server->attr_bitmask;
2678                 data->res.server = server;
2679                 data->res.fh = &data->fh;
2680                 data->res.fattr = &data->fattr;
2681                 data->res.dir_fattr = &data->dir_fattr;
2682                 nfs_fattr_init(data->res.fattr);
2683                 nfs_fattr_init(data->res.dir_fattr);
2684         }
2685         return data;
2686 }
2687
2688 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2689 {
2690         int status = nfs4_call_sync(NFS_SERVER(dir), &data->msg,
2691                                     &data->arg, &data->res, 1);
2692         if (status == 0) {
2693                 update_changeattr(dir, &data->res.dir_cinfo);
2694                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2695                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2696         }
2697         return status;
2698 }
2699
2700 static void nfs4_free_createdata(struct nfs4_createdata *data)
2701 {
2702         kfree(data);
2703 }
2704
2705 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2706                 struct page *page, unsigned int len, struct iattr *sattr)
2707 {
2708         struct nfs4_createdata *data;
2709         int status = -ENAMETOOLONG;
2710
2711         if (len > NFS4_MAXPATHLEN)
2712                 goto out;
2713
2714         status = -ENOMEM;
2715         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2716         if (data == NULL)
2717                 goto out;
2718
2719         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2720         data->arg.u.symlink.pages = &page;
2721         data->arg.u.symlink.len = len;
2722         
2723         status = nfs4_do_create(dir, dentry, data);
2724
2725         nfs4_free_createdata(data);
2726 out:
2727         return status;
2728 }
2729
2730 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2731                 struct page *page, unsigned int len, struct iattr *sattr)
2732 {
2733         struct nfs4_exception exception = { };
2734         int err;
2735         do {
2736                 err = nfs4_handle_exception(NFS_SERVER(dir),
2737                                 _nfs4_proc_symlink(dir, dentry, page,
2738                                                         len, sattr),
2739                                 &exception);
2740         } while (exception.retry);
2741         return err;
2742 }
2743
2744 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2745                 struct iattr *sattr)
2746 {
2747         struct nfs4_createdata *data;
2748         int status = -ENOMEM;
2749
2750         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2751         if (data == NULL)
2752                 goto out;
2753
2754         status = nfs4_do_create(dir, dentry, data);
2755
2756         nfs4_free_createdata(data);
2757 out:
2758         return status;
2759 }
2760
2761 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2762                 struct iattr *sattr)
2763 {
2764         struct nfs4_exception exception = { };
2765         int err;
2766         do {
2767                 err = nfs4_handle_exception(NFS_SERVER(dir),
2768                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2769                                 &exception);
2770         } while (exception.retry);
2771         return err;
2772 }
2773
2774 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2775                   u64 cookie, struct page *page, unsigned int count, int plus)
2776 {
2777         struct inode            *dir = dentry->d_inode;
2778         struct nfs4_readdir_arg args = {
2779                 .fh = NFS_FH(dir),
2780                 .pages = &page,
2781                 .pgbase = 0,
2782                 .count = count,
2783                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2784         };
2785         struct nfs4_readdir_res res;
2786         struct rpc_message msg = {
2787                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2788                 .rpc_argp = &args,
2789                 .rpc_resp = &res,
2790                 .rpc_cred = cred,
2791         };
2792         int                     status;
2793
2794         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
2795                         dentry->d_parent->d_name.name,
2796                         dentry->d_name.name,
2797                         (unsigned long long)cookie);
2798         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2799         res.pgbase = args.pgbase;
2800         status = nfs4_call_sync(NFS_SERVER(dir), &msg, &args, &res, 0);
2801         if (status == 0)
2802                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2803
2804         nfs_invalidate_atime(dir);
2805
2806         dprintk("%s: returns %d\n", __func__, status);
2807         return status;
2808 }
2809
2810 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2811                   u64 cookie, struct page *page, unsigned int count, int plus)
2812 {
2813         struct nfs4_exception exception = { };
2814         int err;
2815         do {
2816                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2817                                 _nfs4_proc_readdir(dentry, cred, cookie,
2818                                         page, count, plus),
2819                                 &exception);
2820         } while (exception.retry);
2821         return err;
2822 }
2823
2824 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2825                 struct iattr *sattr, dev_t rdev)
2826 {
2827         struct nfs4_createdata *data;
2828         int mode = sattr->ia_mode;
2829         int status = -ENOMEM;
2830
2831         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2832         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2833
2834         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
2835         if (data == NULL)
2836                 goto out;
2837
2838         if (S_ISFIFO(mode))
2839                 data->arg.ftype = NF4FIFO;
2840         else if (S_ISBLK(mode)) {
2841                 data->arg.ftype = NF4BLK;
2842                 data->arg.u.device.specdata1 = MAJOR(rdev);
2843                 data->arg.u.device.specdata2 = MINOR(rdev);
2844         }
2845         else if (S_ISCHR(mode)) {
2846                 data->arg.ftype = NF4CHR;
2847                 data->arg.u.device.specdata1 = MAJOR(rdev);
2848                 data->arg.u.device.specdata2 = MINOR(rdev);
2849         }
2850         
2851         status = nfs4_do_create(dir, dentry, data);
2852
2853         nfs4_free_createdata(data);
2854 out:
2855         return status;
2856 }
2857
2858 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2859                 struct iattr *sattr, dev_t rdev)
2860 {
2861         struct nfs4_exception exception = { };
2862         int err;
2863         do {
2864                 err = nfs4_handle_exception(NFS_SERVER(dir),
2865                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2866                                 &exception);
2867         } while (exception.retry);
2868         return err;
2869 }
2870
2871 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2872                  struct nfs_fsstat *fsstat)
2873 {
2874         struct nfs4_statfs_arg args = {
2875                 .fh = fhandle,
2876                 .bitmask = server->attr_bitmask,
2877         };
2878         struct nfs4_statfs_res res = {
2879                 .fsstat = fsstat,
2880         };
2881         struct rpc_message msg = {
2882                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2883                 .rpc_argp = &args,
2884                 .rpc_resp = &res,
2885         };
2886
2887         nfs_fattr_init(fsstat->fattr);
2888         return  nfs4_call_sync(server, &msg, &args, &res, 0);
2889 }
2890
2891 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2892 {
2893         struct nfs4_exception exception = { };
2894         int err;
2895         do {
2896                 err = nfs4_handle_exception(server,
2897                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2898                                 &exception);
2899         } while (exception.retry);
2900         return err;
2901 }
2902
2903 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2904                 struct nfs_fsinfo *fsinfo)
2905 {
2906         struct nfs4_fsinfo_arg args = {
2907                 .fh = fhandle,
2908                 .bitmask = server->attr_bitmask,
2909         };
2910         struct nfs4_fsinfo_res res = {
2911                 .fsinfo = fsinfo,
2912         };
2913         struct rpc_message msg = {
2914                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2915                 .rpc_argp = &args,
2916                 .rpc_resp = &res,
2917         };
2918
2919         return nfs4_call_sync(server, &msg, &args, &res, 0);
2920 }
2921
2922 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2923 {
2924         struct nfs4_exception exception = { };
2925         int err;
2926
2927         do {
2928                 err = nfs4_handle_exception(server,
2929                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2930                                 &exception);
2931         } while (exception.retry);
2932         return err;
2933 }
2934
2935 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2936 {
2937         nfs_fattr_init(fsinfo->fattr);
2938         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2939 }
2940
2941 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2942                 struct nfs_pathconf *pathconf)
2943 {
2944         struct nfs4_pathconf_arg args = {
2945                 .fh = fhandle,
2946                 .bitmask = server->attr_bitmask,
2947         };
2948         struct nfs4_pathconf_res res = {
2949                 .pathconf = pathconf,
2950         };
2951         struct rpc_message msg = {
2952                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2953                 .rpc_argp = &args,
2954                 .rpc_resp = &res,
2955         };
2956
2957         /* None of the pathconf attributes are mandatory to implement */
2958         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2959                 memset(pathconf, 0, sizeof(*pathconf));
2960                 return 0;
2961         }
2962
2963         nfs_fattr_init(pathconf->fattr);
2964         return nfs4_call_sync(server, &msg, &args, &res, 0);
2965 }
2966
2967 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2968                 struct nfs_pathconf *pathconf)
2969 {
2970         struct nfs4_exception exception = { };
2971         int err;
2972
2973         do {
2974                 err = nfs4_handle_exception(server,
2975                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2976                                 &exception);
2977         } while (exception.retry);
2978         return err;
2979 }
2980
2981 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
2982 {
2983         struct nfs_server *server = NFS_SERVER(data->inode);
2984
2985         dprintk("--> %s\n", __func__);
2986
2987         /* nfs4_sequence_free_slot called in the read rpc_call_done */
2988         nfs4_sequence_done(server, &data->res.seq_res, task->tk_status);
2989
2990         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
2991                 nfs4_restart_rpc(task, server->nfs_client);
2992                 return -EAGAIN;
2993         }
2994
2995         nfs_invalidate_atime(data->inode);
2996         if (task->tk_status > 0)
2997                 renew_lease(server, data->timestamp);
2998         return 0;
2999 }
3000
3001 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3002 {
3003         data->timestamp   = jiffies;
3004         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3005 }
3006
3007 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3008 {
3009         struct inode *inode = data->inode;
3010         
3011         /* slot is freed in nfs_writeback_done */
3012         nfs4_sequence_done(NFS_SERVER(inode), &data->res.seq_res,
3013                            task->tk_status);
3014
3015         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3016                 nfs4_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3017                 return -EAGAIN;
3018         }
3019         if (task->tk_status >= 0) {
3020                 renew_lease(NFS_SERVER(inode), data->timestamp);
3021                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3022         }
3023         return 0;
3024 }
3025
3026 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3027 {
3028         struct nfs_server *server = NFS_SERVER(data->inode);
3029
3030         data->args.bitmask = server->cache_consistency_bitmask;
3031         data->res.server = server;
3032         data->timestamp   = jiffies;
3033
3034         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3035 }
3036
3037 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3038 {
3039         struct inode *inode = data->inode;
3040         
3041         nfs4_sequence_done(NFS_SERVER(inode), &data->res.seq_res,
3042                            task->tk_status);
3043         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3044                 nfs4_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3045                 return -EAGAIN;
3046         }
3047         nfs4_sequence_free_slot(NFS_SERVER(inode)->nfs_client,
3048                                 &data->res.seq_res);
3049         nfs_refresh_inode(inode, data->res.fattr);
3050         return 0;
3051 }
3052
3053 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3054 {
3055         struct nfs_server *server = NFS_SERVER(data->inode);
3056         
3057         data->args.bitmask = server->cache_consistency_bitmask;
3058         data->res.server = server;
3059         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3060 }
3061
3062 /*
3063  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3064  * standalone procedure for queueing an asynchronous RENEW.
3065  */
3066 static void nfs4_renew_done(struct rpc_task *task, void *data)
3067 {
3068         struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
3069         unsigned long timestamp = (unsigned long)data;
3070
3071         if (task->tk_status < 0) {
3072                 /* Unless we're shutting down, schedule state recovery! */
3073                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) != 0)
3074                         nfs4_schedule_state_recovery(clp);
3075                 return;
3076         }
3077         spin_lock(&clp->cl_lock);
3078         if (time_before(clp->cl_last_renewal,timestamp))
3079                 clp->cl_last_renewal = timestamp;
3080         spin_unlock(&clp->cl_lock);
3081 }
3082
3083 static const struct rpc_call_ops nfs4_renew_ops = {
3084         .rpc_call_done = nfs4_renew_done,
3085 };
3086
3087 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
3088 {
3089         struct rpc_message msg = {
3090                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3091                 .rpc_argp       = clp,
3092                 .rpc_cred       = cred,
3093         };
3094
3095         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3096                         &nfs4_renew_ops, (void *)jiffies);
3097 }
3098
3099 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3100 {
3101         struct rpc_message msg = {
3102                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3103                 .rpc_argp       = clp,
3104                 .rpc_cred       = cred,
3105         };
3106         unsigned long now = jiffies;
3107         int status;
3108
3109         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3110         if (status < 0)
3111                 return status;
3112         spin_lock(&clp->cl_lock);
3113         if (time_before(clp->cl_last_renewal,now))
3114                 clp->cl_last_renewal = now;
3115         spin_unlock(&clp->cl_lock);
3116         return 0;
3117 }
3118
3119 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3120 {
3121         return (server->caps & NFS_CAP_ACLS)
3122                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3123                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3124 }
3125
3126 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3127  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3128  * the stack.
3129  */
3130 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3131
3132 static void buf_to_pages(const void *buf, size_t buflen,
3133                 struct page **pages, unsigned int *pgbase)
3134 {
3135         const void *p = buf;
3136
3137         *pgbase = offset_in_page(buf);
3138         p -= *pgbase;
3139         while (p < buf + buflen) {
3140                 *(pages++) = virt_to_page(p);
3141                 p += PAGE_CACHE_SIZE;
3142         }
3143 }
3144
3145 struct nfs4_cached_acl {
3146         int cached;
3147         size_t len;
3148         char data[0];
3149 };
3150
3151 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3152 {
3153         struct nfs_inode *nfsi = NFS_I(inode);
3154
3155         spin_lock(&inode->i_lock);
3156         kfree(nfsi->nfs4_acl);
3157         nfsi->nfs4_acl = acl;
3158         spin_unlock(&inode->i_lock);
3159 }
3160
3161 static void nfs4_zap_acl_attr(struct inode *inode)
3162 {
3163         nfs4_set_cached_acl(inode, NULL);
3164 }
3165
3166 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3167 {
3168         struct nfs_inode *nfsi = NFS_I(inode);
3169         struct nfs4_cached_acl *acl;
3170         int ret = -ENOENT;
3171
3172         spin_lock(&inode->i_lock);
3173         acl = nfsi->nfs4_acl;
3174         if (acl == NULL)
3175                 goto out;
3176         if (buf == NULL) /* user is just asking for length */
3177                 goto out_len;
3178         if (acl->cached == 0)
3179                 goto out;
3180         ret = -ERANGE; /* see getxattr(2) man page */
3181         if (acl->len > buflen)
3182                 goto out;
3183         memcpy(buf, acl->data, acl->len);
3184 out_len:
3185         ret = acl->len;
3186 out:
3187         spin_unlock(&inode->i_lock);
3188         return ret;
3189 }
3190
3191 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
3192 {
3193         struct nfs4_cached_acl *acl;
3194
3195         if (buf && acl_len <= PAGE_SIZE) {
3196                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3197                 if (acl == NULL)
3198                         goto out;
3199                 acl->cached = 1;
3200                 memcpy(acl->data, buf, acl_len);
3201         } else {
3202                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3203                 if (acl == NULL)
3204                         goto out;
3205                 acl->cached = 0;
3206         }
3207         acl->len = acl_len;
3208 out:
3209         nfs4_set_cached_acl(inode, acl);
3210 }
3211
3212 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3213 {
3214         struct page *pages[NFS4ACL_MAXPAGES];
3215         struct nfs_getaclargs args = {
3216                 .fh = NFS_FH(inode),
3217                 .acl_pages = pages,
3218                 .acl_len = buflen,
3219         };
3220         struct nfs_getaclres res = {
3221                 .acl_len = buflen,
3222         };
3223         void *resp_buf;
3224         struct rpc_message msg = {
3225                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3226                 .rpc_argp = &args,
3227                 .rpc_resp = &res,
3228         };
3229         struct page *localpage = NULL;
3230         int ret;
3231
3232         if (buflen < PAGE_SIZE) {
3233                 /* As long as we're doing a round trip to the server anyway,
3234                  * let's be prepared for a page of acl data. */
3235                 localpage = alloc_page(GFP_KERNEL);
3236                 resp_buf = page_address(localpage);
3237                 if (localpage == NULL)
3238                         return -ENOMEM;
3239                 args.acl_pages[0] = localpage;
3240                 args.acl_pgbase = 0;
3241                 args.acl_len = PAGE_SIZE;
3242         } else {
3243                 resp_buf = buf;
3244                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
3245         }
3246         ret = nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
3247         if (ret)
3248                 goto out_free;
3249         if (res.acl_len > args.acl_len)
3250                 nfs4_write_cached_acl(inode, NULL, res.acl_len);
3251         else
3252                 nfs4_write_cached_acl(inode, resp_buf, res.acl_len);
3253         if (buf) {
3254                 ret = -ERANGE;
3255                 if (res.acl_len > buflen)
3256                         goto out_free;
3257                 if (localpage)
3258                         memcpy(buf, resp_buf, res.acl_len);
3259         }
3260         ret = res.acl_len;
3261 out_free:
3262         if (localpage)
3263                 __free_page(localpage);
3264         return ret;
3265 }
3266
3267 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3268 {
3269         struct nfs4_exception exception = { };
3270         ssize_t ret;
3271         do {
3272                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3273                 if (ret >= 0)
3274                         break;
3275                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3276         } while (exception.retry);
3277         return ret;
3278 }
3279
3280 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3281 {
3282         struct nfs_server *server = NFS_SERVER(inode);
3283         int ret;
3284
3285         if (!nfs4_server_supports_acls(server))
3286                 return -EOPNOTSUPP;
3287         ret = nfs_revalidate_inode(server, inode);
3288         if (ret < 0)
3289                 return ret;
3290         ret = nfs4_read_cached_acl(inode, buf, buflen);
3291         if (ret != -ENOENT)
3292                 return ret;
3293         return nfs4_get_acl_uncached(inode, buf, buflen);
3294 }
3295
3296 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3297 {
3298         struct nfs_server *server = NFS_SERVER(inode);
3299         struct page *pages[NFS4ACL_MAXPAGES];
3300         struct nfs_setaclargs arg = {
3301                 .fh             = NFS_FH(inode),
3302                 .acl_pages      = pages,
3303                 .acl_len        = buflen,
3304         };
3305         struct nfs_setaclres res;
3306         struct rpc_message msg = {
3307                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3308                 .rpc_argp       = &arg,
3309                 .rpc_resp       = &res,
3310         };
3311         int ret;
3312
3313         if (!nfs4_server_supports_acls(server))
3314                 return -EOPNOTSUPP;
3315         nfs_inode_return_delegation(inode);
3316         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3317         ret = nfs4_call_sync(server, &msg, &arg, &res, 1);
3318         nfs_access_zap_cache(inode);
3319         nfs_zap_acl_cache(inode);
3320         return ret;
3321 }
3322
3323 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3324 {
3325         struct nfs4_exception exception = { };
3326         int err;
3327         do {
3328                 err = nfs4_handle_exception(NFS_SERVER(inode),
3329                                 __nfs4_proc_set_acl(inode, buf, buflen),
3330                                 &exception);
3331         } while (exception.retry);
3332         return err;
3333 }
3334
3335 static int
3336 _nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs_client *clp, struct nfs4_state *state)
3337 {
3338         if (!clp || task->tk_status >= 0)
3339                 return 0;
3340         switch(task->tk_status) {
3341                 case -NFS4ERR_ADMIN_REVOKED:
3342                 case -NFS4ERR_BAD_STATEID:
3343                 case -NFS4ERR_OPENMODE:
3344                         if (state == NULL)
3345                                 break;
3346                         nfs4_state_mark_reclaim_nograce(clp, state);
3347                 case -NFS4ERR_STALE_CLIENTID:
3348                 case -NFS4ERR_STALE_STATEID:
3349                 case -NFS4ERR_EXPIRED:
3350                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3351                         nfs4_schedule_state_recovery(clp);
3352                         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3353                                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3354                         task->tk_status = 0;
3355                         return -EAGAIN;
3356 #if defined(CONFIG_NFS_V4_1)
3357                 case -NFS4ERR_BADSESSION:
3358                 case -NFS4ERR_BADSLOT:
3359                 case -NFS4ERR_BAD_HIGH_SLOT:
3360                 case -NFS4ERR_DEADSESSION:
3361                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3362                 case -NFS4ERR_SEQ_FALSE_RETRY:
3363                 case -NFS4ERR_SEQ_MISORDERED:
3364                         dprintk("%s ERROR %d, Reset session\n", __func__,
3365                                 task->tk_status);
3366                         set_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state);
3367                         task->tk_status = 0;
3368                         return -EAGAIN;
3369 #endif /* CONFIG_NFS_V4_1 */
3370                 case -NFS4ERR_DELAY:
3371                         if (server)
3372                                 nfs_inc_server_stats(server, NFSIOS_DELAY);
3373                 case -NFS4ERR_GRACE:
3374                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3375                         task->tk_status = 0;
3376                         return -EAGAIN;
3377                 case -NFS4ERR_OLD_STATEID:
3378                         task->tk_status = 0;
3379                         return -EAGAIN;
3380         }
3381         task->tk_status = nfs4_map_errors(task->tk_status);
3382         return 0;
3383 }
3384
3385 static int
3386 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3387 {
3388         return _nfs4_async_handle_error(task, server, server->nfs_client, state);
3389 }
3390
3391 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
3392 {
3393         nfs4_verifier sc_verifier;
3394         struct nfs4_setclientid setclientid = {
3395                 .sc_verifier = &sc_verifier,
3396                 .sc_prog = program,
3397         };
3398         struct rpc_message msg = {
3399                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3400                 .rpc_argp = &setclientid,
3401                 .rpc_resp = clp,
3402                 .rpc_cred = cred,
3403         };
3404         __be32 *p;
3405         int loop = 0;
3406         int status;
3407
3408         p = (__be32*)sc_verifier.data;
3409         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3410         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3411
3412         for(;;) {
3413                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3414                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3415                                 clp->cl_ipaddr,
3416                                 rpc_peeraddr2str(clp->cl_rpcclient,
3417                                                         RPC_DISPLAY_ADDR),
3418                                 rpc_peeraddr2str(clp->cl_rpcclient,
3419                                                         RPC_DISPLAY_PROTO),
3420                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3421                                 clp->cl_id_uniquifier);
3422                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3423                                 sizeof(setclientid.sc_netid),
3424                                 rpc_peeraddr2str(clp->cl_rpcclient,
3425                                                         RPC_DISPLAY_NETID));
3426                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3427                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3428                                 clp->cl_ipaddr, port >> 8, port & 255);
3429
3430                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3431                 if (status != -NFS4ERR_CLID_INUSE)
3432                         break;
3433                 if (signalled())
3434                         break;
3435                 if (loop++ & 1)
3436                         ssleep(clp->cl_lease_time + 1);
3437                 else
3438                         if (++clp->cl_id_uniquifier == 0)
3439                                 break;
3440         }
3441         return status;
3442 }
3443
3444 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
3445 {
3446         struct nfs_fsinfo fsinfo;
3447         struct rpc_message msg = {
3448                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3449                 .rpc_argp = clp,
3450                 .rpc_resp = &fsinfo,
3451                 .rpc_cred = cred,
3452         };
3453         unsigned long now;
3454         int status;
3455
3456         now = jiffies;
3457         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3458         if (status == 0) {
3459                 spin_lock(&clp->cl_lock);
3460                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3461                 clp->cl_last_renewal = now;
3462                 spin_unlock(&clp->cl_lock);
3463         }
3464         return status;
3465 }
3466
3467 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
3468 {
3469         long timeout = 0;
3470         int err;
3471         do {
3472                 err = _nfs4_proc_setclientid_confirm(clp, cred);
3473                 switch (err) {
3474                         case 0:
3475                                 return err;
3476                         case -NFS4ERR_RESOURCE:
3477                                 /* The IBM lawyers misread another document! */
3478                         case -NFS4ERR_DELAY:
3479                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
3480                 }
3481         } while (err == 0);
3482         return err;
3483 }
3484
3485 struct nfs4_delegreturndata {
3486         struct nfs4_delegreturnargs args;
3487         struct nfs4_delegreturnres res;
3488         struct nfs_fh fh;
3489         nfs4_stateid stateid;
3490         unsigned long timestamp;
3491         struct nfs_fattr fattr;
3492         int rpc_status;
3493 };
3494
3495 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3496 {
3497         struct nfs4_delegreturndata *data = calldata;
3498
3499         nfs4_sequence_done_free_slot(data->res.server, &data->res.seq_res,
3500                                      task->tk_status);
3501
3502         data->rpc_status = task->tk_status;
3503         if (data->rpc_status == 0)
3504                 renew_lease(data->res.server, data->timestamp);
3505 }
3506
3507 static void nfs4_delegreturn_release(void *calldata)
3508 {
3509         kfree(calldata);
3510 }
3511
3512 #if defined(CONFIG_NFS_V4_1)
3513 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3514 {
3515         struct nfs4_delegreturndata *d_data;
3516
3517         d_data = (struct nfs4_delegreturndata *)data;
3518
3519         if (nfs4_setup_sequence(d_data->res.server->nfs_client,
3520                                 &d_data->args.seq_args,
3521                                 &d_data->res.seq_res, 1, task))
3522                 return;
3523         rpc_call_start(task);
3524 }
3525 #endif /* CONFIG_NFS_V4_1 */
3526
3527 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3528 #if defined(CONFIG_NFS_V4_1)
3529         .rpc_call_prepare = nfs4_delegreturn_prepare,
3530 #endif /* CONFIG_NFS_V4_1 */
3531         .rpc_call_done = nfs4_delegreturn_done,
3532         .rpc_release = nfs4_delegreturn_release,
3533 };
3534
3535 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3536 {
3537         struct nfs4_delegreturndata *data;
3538         struct nfs_server *server = NFS_SERVER(inode);
3539         struct rpc_task *task;
3540         struct rpc_message msg = {
3541                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3542                 .rpc_cred = cred,
3543         };
3544         struct rpc_task_setup task_setup_data = {
3545                 .rpc_client = server->client,
3546                 .rpc_message = &msg,
3547                 .callback_ops = &nfs4_delegreturn_ops,
3548                 .flags = RPC_TASK_ASYNC,
3549         };
3550         int status = 0;
3551
3552         data = kzalloc(sizeof(*data), GFP_KERNEL);
3553         if (data == NULL)
3554                 return -ENOMEM;
3555         data->args.fhandle = &data->fh;
3556         data->args.stateid = &data->stateid;
3557         data->args.bitmask = server->attr_bitmask;
3558         nfs_copy_fh(&data->fh, NFS_FH(inode));
3559         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3560         data->res.fattr = &data->fattr;
3561         data->res.server = server;
3562         data->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3563         nfs_fattr_init(data->res.fattr);
3564         data->timestamp = jiffies;
3565         data->rpc_status = 0;
3566
3567         task_setup_data.callback_data = data;
3568         msg.rpc_argp = &data->args,
3569         msg.rpc_resp = &data->res,
3570         task = rpc_run_task(&task_setup_data);
3571         if (IS_ERR(task))
3572                 return PTR_ERR(task);
3573         if (!issync)
3574                 goto out;
3575         status = nfs4_wait_for_completion_rpc_task(task);
3576         if (status != 0)
3577                 goto out;
3578         status = data->rpc_status;
3579         if (status != 0)
3580                 goto out;
3581         nfs_refresh_inode(inode, &data->fattr);
3582 out:
3583         rpc_put_task(task);
3584         return status;
3585 }
3586
3587 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3588 {
3589         struct nfs_server *server = NFS_SERVER(inode);
3590         struct nfs4_exception exception = { };
3591         int err;
3592         do {
3593                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3594                 switch (err) {
3595                         case -NFS4ERR_STALE_STATEID:
3596                         case -NFS4ERR_EXPIRED:
3597                         case 0:
3598                                 return 0;
3599                 }
3600                 err = nfs4_handle_exception(server, err, &exception);
3601         } while (exception.retry);
3602         return err;
3603 }
3604
3605 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3606 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3607
3608 /* 
3609  * sleep, with exponential backoff, and retry the LOCK operation. 
3610  */
3611 static unsigned long
3612 nfs4_set_lock_task_retry(unsigned long timeout)
3613 {
3614         schedule_timeout_killable(timeout);
3615         timeout <<= 1;
3616         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3617                 return NFS4_LOCK_MAXTIMEOUT;
3618         return timeout;
3619 }
3620
3621 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3622 {
3623         struct inode *inode = state->inode;
3624         struct nfs_server *server = NFS_SERVER(inode);
3625         struct nfs_client *clp = server->nfs_client;
3626         struct nfs_lockt_args arg = {
3627                 .fh = NFS_FH(inode),
3628                 .fl = request,
3629         };
3630         struct nfs_lockt_res res = {
3631                 .denied = request,
3632         };
3633         struct rpc_message msg = {
3634                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3635                 .rpc_argp       = &arg,
3636                 .rpc_resp       = &res,
3637                 .rpc_cred       = state->owner->so_cred,
3638         };
3639         struct nfs4_lock_state *lsp;
3640         int status;
3641
3642         arg.lock_owner.clientid = clp->cl_clientid;
3643         status = nfs4_set_lock_state(state, request);
3644         if (status != 0)
3645                 goto out;
3646         lsp = request->fl_u.nfs4_fl.owner;
3647         arg.lock_owner.id = lsp->ls_id.id;
3648         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
3649         switch (status) {
3650                 case 0:
3651                         request->fl_type = F_UNLCK;
3652                         break;
3653                 case -NFS4ERR_DENIED:
3654                         status = 0;
3655         }
3656         request->fl_ops->fl_release_private(request);
3657 out:
3658         return status;
3659 }
3660
3661 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3662 {
3663         struct nfs4_exception exception = { };
3664         int err;
3665
3666         do {
3667                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3668                                 _nfs4_proc_getlk(state, cmd, request),
3669                                 &exception);
3670         } while (exception.retry);
3671         return err;
3672 }
3673
3674 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3675 {
3676         int res = 0;
3677         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3678                 case FL_POSIX:
3679                         res = posix_lock_file_wait(file, fl);
3680                         break;
3681                 case FL_FLOCK:
3682                         res = flock_lock_file_wait(file, fl);
3683                         break;
3684                 default:
3685                         BUG();
3686         }
3687         return res;
3688 }
3689
3690 struct nfs4_unlockdata {
3691         struct nfs_locku_args arg;
3692         struct nfs_locku_res res;
3693         struct nfs4_lock_state *lsp;
3694         struct nfs_open_context *ctx;
3695         struct file_lock fl;
3696         const struct nfs_server *server;
3697         unsigned long timestamp;
3698 };
3699
3700 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3701                 struct nfs_open_context *ctx,
3702                 struct nfs4_lock_state *lsp,
3703                 struct nfs_seqid *seqid)
3704 {
3705         struct nfs4_unlockdata *p;
3706         struct inode *inode = lsp->ls_state->inode;
3707
3708         p = kzalloc(sizeof(*p), GFP_KERNEL);
3709         if (p == NULL)
3710                 return NULL;
3711         p->arg.fh = NFS_FH(inode);
3712         p->arg.fl = &p->fl;
3713         p->arg.seqid = seqid;
3714         p->res.seqid = seqid;
3715         p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3716         p->arg.stateid = &lsp->ls_stateid;
3717         p->lsp = lsp;
3718         atomic_inc(&lsp->ls_count);
3719         /* Ensure we don't close file until we're done freeing locks! */
3720         p->ctx = get_nfs_open_context(ctx);
3721         memcpy(&p->fl, fl, sizeof(p->fl));
3722         p->server = NFS_SERVER(inode);
3723         return p;
3724 }
3725
3726 static void nfs4_locku_release_calldata(void *data)
3727 {
3728         struct nfs4_unlockdata *calldata = data;
3729         nfs_free_seqid(calldata->arg.seqid);
3730         nfs4_put_lock_state(calldata->lsp);
3731         put_nfs_open_context(calldata->ctx);
3732         kfree(calldata);
3733 }
3734
3735 static void nfs4_locku_done(struct rpc_task *task, void *data)
3736 {
3737         struct nfs4_unlockdata *calldata = data;
3738
3739         nfs4_sequence_done(calldata->server, &calldata->res.seq_res,
3740                            task->tk_status);
3741         if (RPC_ASSASSINATED(task))
3742                 return;
3743         switch (task->tk_status) {
3744                 case 0:
3745                         memcpy(calldata->lsp->ls_stateid.data,
3746                                         calldata->res.stateid.data,
3747                                         sizeof(calldata->lsp->ls_stateid.data));
3748                         renew_lease(calldata->server, calldata->timestamp);
3749                         break;
3750                 case -NFS4ERR_BAD_STATEID:
3751                 case -NFS4ERR_OLD_STATEID:
3752                 case -NFS4ERR_STALE_STATEID:
3753                 case -NFS4ERR_EXPIRED:
3754                         break;
3755                 default:
3756                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
3757                                 nfs4_restart_rpc(task,
3758                                                 calldata->server->nfs_client);
3759         }
3760         nfs4_sequence_free_slot(calldata->server->nfs_client,
3761                                 &calldata->res.seq_res);
3762 }
3763
3764 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3765 {
3766         struct nfs4_unlockdata *calldata = data;
3767
3768         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3769                 return;
3770         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3771                 /* Note: exit _without_ running nfs4_locku_done */
3772                 task->tk_action = NULL;
3773                 return;
3774         }
3775         calldata->timestamp = jiffies;
3776         if (nfs4_setup_sequence(calldata->server->nfs_client,
3777                                 &calldata->arg.seq_args,
3778                                 &calldata->res.seq_res, 1, task))
3779                 return;
3780         rpc_call_start(task);
3781 }
3782
3783 static const struct rpc_call_ops nfs4_locku_ops = {
3784         .rpc_call_prepare = nfs4_locku_prepare,
3785         .rpc_call_done = nfs4_locku_done,
3786         .rpc_release = nfs4_locku_release_calldata,
3787 };
3788
3789 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3790                 struct nfs_open_context *ctx,
3791                 struct nfs4_lock_state *lsp,
3792                 struct nfs_seqid *seqid)
3793 {
3794         struct nfs4_unlockdata *data;
3795         struct rpc_message msg = {
3796                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3797                 .rpc_cred = ctx->cred,
3798         };
3799         struct rpc_task_setup task_setup_data = {
3800                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
3801                 .rpc_message = &msg,
3802                 .callback_ops = &nfs4_locku_ops,
3803                 .workqueue = nfsiod_workqueue,
3804                 .flags = RPC_TASK_ASYNC,
3805         };
3806
3807         /* Ensure this is an unlock - when canceling a lock, the
3808          * canceled lock is passed in, and it won't be an unlock.
3809          */
3810         fl->fl_type = F_UNLCK;
3811
3812         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3813         if (data == NULL) {
3814                 nfs_free_seqid(seqid);
3815                 return ERR_PTR(-ENOMEM);
3816         }
3817
3818         msg.rpc_argp = &data->arg,
3819         msg.rpc_resp = &data->res,
3820         task_setup_data.callback_data = data;
3821         return rpc_run_task(&task_setup_data);
3822 }
3823
3824 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3825 {
3826         struct nfs_inode *nfsi = NFS_I(state->inode);
3827         struct nfs_seqid *seqid;
3828         struct nfs4_lock_state *lsp;
3829         struct rpc_task *task;
3830         int status = 0;
3831         unsigned char fl_flags = request->fl_flags;
3832
3833         status = nfs4_set_lock_state(state, request);
3834         /* Unlock _before_ we do the RPC call */
3835         request->fl_flags |= FL_EXISTS;
3836         down_read(&nfsi->rwsem);
3837         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
3838                 up_read(&nfsi->rwsem);
3839                 goto out;
3840         }
3841         up_read(&nfsi->rwsem);
3842         if (status != 0)
3843                 goto out;
3844         /* Is this a delegated lock? */
3845         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3846                 goto out;
3847         lsp = request->fl_u.nfs4_fl.owner;
3848         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3849         status = -ENOMEM;
3850         if (seqid == NULL)
3851                 goto out;
3852         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
3853         status = PTR_ERR(task);
3854         if (IS_ERR(task))
3855                 goto out;
3856         status = nfs4_wait_for_completion_rpc_task(task);
3857         rpc_put_task(task);
3858 out:
3859         request->fl_flags = fl_flags;
3860         return status;
3861 }
3862
3863 struct nfs4_lockdata {
3864         struct nfs_lock_args arg;
3865         struct nfs_lock_res res;
3866         struct nfs4_lock_state *lsp;
3867         struct nfs_open_context *ctx;
3868         struct file_lock fl;
3869         unsigned long timestamp;
3870         int rpc_status;
3871         int cancelled;
3872         struct nfs_server *server;
3873 };
3874
3875 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3876                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3877 {
3878         struct nfs4_lockdata *p;
3879         struct inode *inode = lsp->ls_state->inode;
3880         struct nfs_server *server = NFS_SERVER(inode);
3881
3882         p = kzalloc(sizeof(*p), GFP_KERNEL);
3883         if (p == NULL)
3884                 return NULL;
3885
3886         p->arg.fh = NFS_FH(inode);
3887         p->arg.fl = &p->fl;
3888         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid);
3889         if (p->arg.open_seqid == NULL)
3890                 goto out_free;
3891         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3892         if (p->arg.lock_seqid == NULL)
3893                 goto out_free_seqid;
3894         p->arg.lock_stateid = &lsp->ls_stateid;
3895         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3896         p->arg.lock_owner.id = lsp->ls_id.id;
3897         p->res.lock_seqid = p->arg.lock_seqid;
3898         p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3899         p->lsp = lsp;
3900         p->server = server;
3901         atomic_inc(&lsp->ls_count);
3902         p->ctx = get_nfs_open_context(ctx);
3903         memcpy(&p->fl, fl, sizeof(p->fl));
3904         return p;
3905 out_free_seqid:
3906         nfs_free_seqid(p->arg.open_seqid);
3907 out_free:
3908         kfree(p);
3909         return NULL;
3910 }
3911
3912 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3913 {
3914         struct nfs4_lockdata *data = calldata;
3915         struct nfs4_state *state = data->lsp->ls_state;
3916
3917         dprintk("%s: begin!\n", __func__);
3918         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3919                 return;
3920         /* Do we need to do an open_to_lock_owner? */
3921         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3922                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
3923                         return;
3924                 data->arg.open_stateid = &state->stateid;
3925                 data->arg.new_lock_owner = 1;
3926                 data->res.open_seqid = data->arg.open_seqid;
3927         } else
3928                 data->arg.new_lock_owner = 0;
3929         data->timestamp = jiffies;
3930         if (nfs4_setup_sequence(data->server->nfs_client, &data->arg.seq_args,
3931                                 &data->res.seq_res, 1, task))
3932                 return;
3933         rpc_call_start(task);
3934         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
3935 }
3936
3937 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3938 {
3939         struct nfs4_lockdata *data = calldata;
3940
3941         dprintk("%s: begin!\n", __func__);
3942
3943         nfs4_sequence_done_free_slot(data->server, &data->res.seq_res,
3944                                      task->tk_status);
3945
3946         data->rpc_status = task->tk_status;
3947         if (RPC_ASSASSINATED(task))
3948                 goto out;
3949         if (data->arg.new_lock_owner != 0) {
3950                 if (data->rpc_status == 0)
3951                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3952                 else
3953                         goto out;
3954         }
3955         if (data->rpc_status == 0) {
3956                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3957                                         sizeof(data->lsp->ls_stateid.data));
3958                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3959                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
3960         }
3961 out:
3962         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
3963 }
3964
3965 static void nfs4_lock_release(void *calldata)
3966 {
3967         struct nfs4_lockdata *data = calldata;
3968
3969         dprintk("%s: begin!\n", __func__);
3970         nfs_free_seqid(data->arg.open_seqid);
3971         if (data->cancelled != 0) {
3972                 struct rpc_task *task;
3973                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3974                                 data->arg.lock_seqid);
3975                 if (!IS_ERR(task))
3976                         rpc_put_task(task);
3977                 dprintk("%s: cancelling lock!\n", __func__);
3978         } else
3979                 nfs_free_seqid(data->arg.lock_seqid);
3980         nfs4_put_lock_state(data->lsp);
3981         put_nfs_open_context(data->ctx);
3982         kfree(data);
3983         dprintk("%s: done!\n", __func__);
3984 }
3985
3986 static const struct rpc_call_ops nfs4_lock_ops = {
3987         .rpc_call_prepare = nfs4_lock_prepare,
3988         .rpc_call_done = nfs4_lock_done,
3989         .rpc_release = nfs4_lock_release,
3990 };
3991
3992 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3993 {
3994         struct nfs4_lockdata *data;
3995         struct rpc_task *task;
3996         struct rpc_message msg = {
3997                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3998                 .rpc_cred = state->owner->so_cred,
3999         };
4000         struct rpc_task_setup task_setup_data = {
4001                 .rpc_client = NFS_CLIENT(state->inode),
4002                 .rpc_message = &msg,
4003                 .callback_ops = &nfs4_lock_ops,
4004                 .workqueue = nfsiod_workqueue,
4005                 .flags = RPC_TASK_ASYNC,
4006         };
4007         int ret;
4008
4009         dprintk("%s: begin!\n", __func__);
4010         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4011                         fl->fl_u.nfs4_fl.owner);
4012         if (data == NULL)
4013                 return -ENOMEM;
4014         if (IS_SETLKW(cmd))
4015                 data->arg.block = 1;
4016         if (reclaim != 0)
4017                 data->arg.reclaim = 1;
4018         msg.rpc_argp = &data->arg,
4019         msg.rpc_resp = &data->res,
4020         task_setup_data.callback_data = data;
4021         task = rpc_run_task(&task_setup_data);
4022         if (IS_ERR(task))
4023                 return PTR_ERR(task);
4024         ret = nfs4_wait_for_completion_rpc_task(task);
4025         if (ret == 0) {
4026                 ret = data->rpc_status;
4027         } else
4028                 data->cancelled = 1;
4029         rpc_put_task(task);
4030         dprintk("%s: done, ret = %d!\n", __func__, ret);
4031         return ret;
4032 }
4033
4034 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4035 {
4036         struct nfs_server *server = NFS_SERVER(state->inode);
4037         struct nfs4_exception exception = { };
4038         int err;
4039
4040         do {
4041                 /* Cache the lock if possible... */
4042                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4043                         return 0;
4044                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
4045                 if (err != -NFS4ERR_DELAY)
4046                         break;
4047                 nfs4_handle_exception(server, err, &exception);
4048         } while (exception.retry);
4049         return err;
4050 }
4051
4052 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4053 {
4054         struct nfs_server *server = NFS_SERVER(state->inode);
4055         struct nfs4_exception exception = { };
4056         int err;
4057
4058         err = nfs4_set_lock_state(state, request);
4059         if (err != 0)
4060                 return err;
4061         do {
4062                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4063                         return 0;
4064                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
4065                 switch (err) {
4066                 default:
4067                         goto out;
4068                 case -NFS4ERR_GRACE:
4069                 case -NFS4ERR_DELAY:
4070                         nfs4_handle_exception(server, err, &exception);
4071                         err = 0;
4072                 }
4073         } while (exception.retry);
4074 out:
4075         return err;
4076 }
4077
4078 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4079 {
4080         struct nfs_inode *nfsi = NFS_I(state->inode);
4081         unsigned char fl_flags = request->fl_flags;
4082         int status;
4083
4084         /* Is this a delegated open? */
4085         status = nfs4_set_lock_state(state, request);
4086         if (status != 0)
4087                 goto out;
4088         request->fl_flags |= FL_ACCESS;
4089         status = do_vfs_lock(request->fl_file, request);
4090         if (status < 0)
4091                 goto out;
4092         down_read(&nfsi->rwsem);
4093         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4094                 /* Yes: cache locks! */
4095                 /* ...but avoid races with delegation recall... */
4096                 request->fl_flags = fl_flags & ~FL_SLEEP;
4097                 status = do_vfs_lock(request->fl_file, request);
4098                 goto out_unlock;
4099         }
4100         status = _nfs4_do_setlk(state, cmd, request, 0);
4101         if (status != 0)
4102                 goto out_unlock;
4103         /* Note: we always want to sleep here! */
4104         request->fl_flags = fl_flags | FL_SLEEP;
4105         if (do_vfs_lock(request->fl_file, request) < 0)
4106                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4107 out_unlock:
4108         up_read(&nfsi->rwsem);
4109 out:
4110         request->fl_flags = fl_flags;
4111         return status;
4112 }
4113
4114 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4115 {
4116         struct nfs4_exception exception = { };
4117         int err;
4118
4119         do {
4120                 err = _nfs4_proc_setlk(state, cmd, request);
4121                 if (err == -NFS4ERR_DENIED)
4122                         err = -EAGAIN;
4123                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4124                                 err, &exception);
4125         } while (exception.retry);
4126         return err;
4127 }
4128
4129 static int
4130 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4131 {
4132         struct nfs_open_context *ctx;
4133         struct nfs4_state *state;
4134         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4135         int status;
4136
4137         /* verify open state */
4138         ctx = nfs_file_open_context(filp);
4139         state = ctx->state;
4140
4141         if (request->fl_start < 0 || request->fl_end < 0)
4142                 return -EINVAL;
4143
4144         if (IS_GETLK(cmd)) {
4145                 if (state != NULL)
4146                         return nfs4_proc_getlk(state, F_GETLK, request);
4147                 return 0;
4148         }
4149
4150         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4151                 return -EINVAL;
4152
4153         if (request->fl_type == F_UNLCK) {
4154                 if (state != NULL)
4155                         return nfs4_proc_unlck(state, cmd, request);
4156                 return 0;
4157         }
4158
4159         if (state == NULL)
4160                 return -ENOLCK;
4161         do {
4162                 status = nfs4_proc_setlk(state, cmd, request);
4163                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4164                         break;
4165                 timeout = nfs4_set_lock_task_retry(timeout);
4166                 status = -ERESTARTSYS;
4167                 if (signalled())
4168                         break;
4169         } while(status < 0);
4170         return status;
4171 }
4172
4173 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4174 {
4175         struct nfs_server *server = NFS_SERVER(state->inode);
4176         struct nfs4_exception exception = { };
4177         int err;
4178
4179         err = nfs4_set_lock_state(state, fl);
4180         if (err != 0)
4181                 goto out;
4182         do {
4183                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
4184                 switch (err) {
4185                         default:
4186                                 printk(KERN_ERR "%s: unhandled error %d.\n",
4187                                                 __func__, err);
4188                         case 0:
4189                         case -ESTALE:
4190                                 goto out;
4191                         case -NFS4ERR_EXPIRED:
4192                         case -NFS4ERR_STALE_CLIENTID:
4193                         case -NFS4ERR_STALE_STATEID:
4194                                 nfs4_schedule_state_recovery(server->nfs_client);
4195                                 goto out;
4196                         case -ERESTARTSYS:
4197                                 /*
4198                                  * The show must go on: exit, but mark the
4199                                  * stateid as needing recovery.
4200                                  */
4201                         case -NFS4ERR_ADMIN_REVOKED:
4202                         case -NFS4ERR_BAD_STATEID:
4203                         case -NFS4ERR_OPENMODE:
4204                                 nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
4205                                 err = 0;
4206                                 goto out;
4207                         case -ENOMEM:
4208                         case -NFS4ERR_DENIED:
4209                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4210                                 err = 0;
4211                                 goto out;
4212                         case -NFS4ERR_DELAY:
4213                                 break;
4214                 }
4215                 err = nfs4_handle_exception(server, err, &exception);
4216         } while (exception.retry);
4217 out:
4218         return err;
4219 }
4220
4221 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4222
4223 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
4224                 size_t buflen, int flags)
4225 {
4226         struct inode *inode = dentry->d_inode;
4227
4228         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
4229                 return -EOPNOTSUPP;
4230
4231         return nfs4_proc_set_acl(inode, buf, buflen);
4232 }
4233
4234 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
4235  * and that's what we'll do for e.g. user attributes that haven't been set.
4236  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
4237  * attributes in kernel-managed attribute namespaces. */
4238 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
4239                 size_t buflen)
4240 {
4241         struct inode *inode = dentry->d_inode;
4242
4243         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
4244                 return -EOPNOTSUPP;
4245
4246         return nfs4_proc_get_acl(inode, buf, buflen);
4247 }
4248
4249 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
4250 {
4251         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
4252
4253         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4254                 return 0;
4255         if (buf && buflen < len)
4256                 return -ERANGE;
4257         if (buf)
4258                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
4259         return len;
4260 }
4261
4262 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4263 {
4264         if (!((fattr->valid & NFS_ATTR_FATTR_FILEID) &&
4265                 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4266                 (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4267                 return;
4268
4269         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4270                 NFS_ATTR_FATTR_NLINK;
4271         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4272         fattr->nlink = 2;
4273 }
4274
4275 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4276                 struct nfs4_fs_locations *fs_locations, struct page *page)
4277 {
4278         struct nfs_server *server = NFS_SERVER(dir);
4279         u32 bitmask[2] = {
4280                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4281                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
4282         };
4283         struct nfs4_fs_locations_arg args = {
4284                 .dir_fh = NFS_FH(dir),
4285                 .name = name,
4286                 .page = page,
4287                 .bitmask = bitmask,
4288         };
4289         struct nfs4_fs_locations_res res = {
4290                 .fs_locations = fs_locations,
4291         };
4292         struct rpc_message msg = {
4293                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4294                 .rpc_argp = &args,
4295                 .rpc_resp = &res,
4296         };
4297         int status;
4298
4299         dprintk("%s: start\n", __func__);
4300         nfs_fattr_init(&fs_locations->fattr);
4301         fs_locations->server = server;
4302         fs_locations->nlocations = 0;
4303         status = nfs4_call_sync(server, &msg, &args, &res, 0);
4304         nfs_fixup_referral_attributes(&fs_locations->fattr);
4305         dprintk("%s: returned status = %d\n", __func__, status);
4306         return status;
4307 }
4308
4309 #ifdef CONFIG_NFS_V4_1
4310 /*
4311  * nfs4_proc_exchange_id()
4312  *
4313  * Since the clientid has expired, all compounds using sessions
4314  * associated with the stale clientid will be returning
4315  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4316  * be in some phase of session reset.
4317  */
4318 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4319 {
4320         nfs4_verifier verifier;
4321         struct nfs41_exchange_id_args args = {
4322                 .client = clp,
4323                 .flags = clp->cl_exchange_flags,
4324         };
4325         struct nfs41_exchange_id_res res = {
4326                 .client = clp,
4327         };
4328         int status;
4329         struct rpc_message msg = {
4330                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4331                 .rpc_argp = &args,
4332                 .rpc_resp = &res,
4333                 .rpc_cred = cred,
4334         };
4335         __be32 *p;
4336
4337         dprintk("--> %s\n", __func__);
4338         BUG_ON(clp == NULL);
4339
4340         p = (u32 *)verifier.data;
4341         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4342         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
4343         args.verifier = &verifier;
4344
4345         while (1) {
4346                 args.id_len = scnprintf(args.id, sizeof(args.id),
4347                                         "%s/%s %u",
4348                                         clp->cl_ipaddr,
4349                                         rpc_peeraddr2str(clp->cl_rpcclient,
4350                                                          RPC_DISPLAY_ADDR),
4351                                         clp->cl_id_uniquifier);
4352
4353                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
4354
4355                 if (status != NFS4ERR_CLID_INUSE)
4356                         break;
4357
4358                 if (signalled())
4359                         break;
4360
4361                 if (++clp->cl_id_uniquifier == 0)
4362                         break;
4363         }
4364
4365         dprintk("<-- %s status= %d\n", __func__, status);
4366         return status;
4367 }
4368
4369 struct nfs4_get_lease_time_data {
4370         struct nfs4_get_lease_time_args *args;
4371         struct nfs4_get_lease_time_res *res;
4372         struct nfs_client *clp;
4373 };
4374
4375 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
4376                                         void *calldata)
4377 {
4378         int ret;
4379         struct nfs4_get_lease_time_data *data =
4380                         (struct nfs4_get_lease_time_data *)calldata;
4381
4382         dprintk("--> %s\n", __func__);
4383         /* just setup sequence, do not trigger session recovery
4384            since we're invoked within one */
4385         ret = nfs41_setup_sequence(data->clp->cl_session,
4386                                         &data->args->la_seq_args,
4387                                         &data->res->lr_seq_res, 0, task);
4388
4389         BUG_ON(ret == -EAGAIN);
4390         rpc_call_start(task);
4391         dprintk("<-- %s\n", __func__);
4392 }
4393
4394 /*
4395  * Called from nfs4_state_manager thread for session setup, so don't recover
4396  * from sequence operation or clientid errors.
4397  */
4398 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
4399 {
4400         struct nfs4_get_lease_time_data *data =
4401                         (struct nfs4_get_lease_time_data *)calldata;
4402
4403         dprintk("--> %s\n", __func__);
4404         nfs41_sequence_done(data->clp, &data->res->lr_seq_res, task->tk_status);
4405         switch (task->tk_status) {
4406         case -NFS4ERR_DELAY:
4407         case -NFS4ERR_GRACE:
4408                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
4409                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
4410                 task->tk_status = 0;
4411                 nfs4_restart_rpc(task, data->clp);
4412                 return;
4413         }
4414         nfs41_sequence_free_slot(data->clp, &data->res->lr_seq_res);
4415         dprintk("<-- %s\n", __func__);
4416 }
4417
4418 struct rpc_call_ops nfs4_get_lease_time_ops = {
4419         .rpc_call_prepare = nfs4_get_lease_time_prepare,
4420         .rpc_call_done = nfs4_get_lease_time_done,
4421 };
4422
4423 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
4424 {
4425         struct rpc_task *task;
4426         struct nfs4_get_lease_time_args args;
4427         struct nfs4_get_lease_time_res res = {
4428                 .lr_fsinfo = fsinfo,
4429         };
4430         struct nfs4_get_lease_time_data data = {
4431                 .args = &args,
4432                 .res = &res,
4433                 .clp = clp,
4434         };
4435         struct rpc_message msg = {
4436                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
4437                 .rpc_argp = &args,
4438                 .rpc_resp = &res,
4439         };
4440         struct rpc_task_setup task_setup = {
4441                 .rpc_client = clp->cl_rpcclient,
4442                 .rpc_message = &msg,
4443                 .callback_ops = &nfs4_get_lease_time_ops,
4444                 .callback_data = &data
4445         };
4446         int status;
4447
4448         res.lr_seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
4449         dprintk("--> %s\n", __func__);
4450         task = rpc_run_task(&task_setup);
4451
4452         if (IS_ERR(task))
4453                 status = PTR_ERR(task);
4454         else {
4455                 status = task->tk_status;
4456                 rpc_put_task(task);
4457         }
4458         dprintk("<-- %s return %d\n", __func__, status);
4459
4460         return status;
4461 }
4462
4463 /*
4464  * Reset a slot table
4465  */
4466 static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, int max_slots,
4467                 int old_max_slots, int ivalue)
4468 {
4469         int i;
4470         int ret = 0;
4471
4472         dprintk("--> %s: max_reqs=%u, tbl %p\n", __func__, max_slots, tbl);
4473
4474         /*
4475          * Until we have dynamic slot table adjustment, insist
4476          * upon the same slot table size
4477          */
4478         if (max_slots != old_max_slots) {
4479                 dprintk("%s reset slot table does't match old\n",
4480                         __func__);
4481                 ret = -EINVAL; /*XXX NFS4ERR_REQ_TOO_BIG ? */
4482                 goto out;
4483         }
4484         spin_lock(&tbl->slot_tbl_lock);
4485         for (i = 0; i < max_slots; ++i)
4486                 tbl->slots[i].seq_nr = ivalue;
4487         tbl->highest_used_slotid = -1;
4488         spin_unlock(&tbl->slot_tbl_lock);
4489         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4490                 tbl, tbl->slots, tbl->max_slots);
4491 out:
4492         dprintk("<-- %s: return %d\n", __func__, ret);
4493         return ret;
4494 }
4495
4496 /*
4497  * Reset the forechannel and backchannel slot tables
4498  */
4499 static int nfs4_reset_slot_tables(struct nfs4_session *session)
4500 {
4501         int status;
4502
4503         status = nfs4_reset_slot_table(&session->fc_slot_table,
4504                         session->fc_attrs.max_reqs,
4505                         session->fc_slot_table.max_slots,
4506                         1);
4507         if (status)
4508                 return status;
4509
4510         status = nfs4_reset_slot_table(&session->bc_slot_table,
4511                         session->bc_attrs.max_reqs,
4512                         session->bc_slot_table.max_slots,
4513                         0);
4514         return status;
4515 }
4516
4517 /* Destroy the slot table */
4518 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
4519 {
4520         if (session->fc_slot_table.slots != NULL) {
4521                 kfree(session->fc_slot_table.slots);
4522                 session->fc_slot_table.slots = NULL;
4523         }
4524         if (session->bc_slot_table.slots != NULL) {
4525                 kfree(session->bc_slot_table.slots);
4526                 session->bc_slot_table.slots = NULL;
4527         }
4528         return;
4529 }
4530
4531 /*
4532  * Initialize slot table
4533  */
4534 static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
4535                 int max_slots, int ivalue)
4536 {
4537         int i;
4538         struct nfs4_slot *slot;
4539         int ret = -ENOMEM;
4540
4541         BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);
4542
4543         dprintk("--> %s: max_reqs=%u\n", __func__, max_slots);
4544
4545         slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_KERNEL);
4546         if (!slot)
4547                 goto out;
4548         for (i = 0; i < max_slots; ++i)
4549                 slot[i].seq_nr = ivalue;
4550         ret = 0;
4551
4552         spin_lock(&tbl->slot_tbl_lock);
4553         if (tbl->slots != NULL) {
4554                 spin_unlock(&tbl->slot_tbl_lock);
4555                 dprintk("%s: slot table already initialized. tbl=%p slots=%p\n",
4556                         __func__, tbl, tbl->slots);
4557                 WARN_ON(1);
4558                 goto out_free;
4559         }
4560         tbl->max_slots = max_slots;
4561         tbl->slots = slot;
4562         tbl->highest_used_slotid = -1;  /* no slot is currently used */
4563         spin_unlock(&tbl->slot_tbl_lock);
4564         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4565                 tbl, tbl->slots, tbl->max_slots);
4566 out:
4567         dprintk("<-- %s: return %d\n", __func__, ret);
4568         return ret;
4569
4570 out_free:
4571         kfree(slot);
4572         goto out;
4573 }
4574
4575 /*
4576  * Initialize the forechannel and backchannel tables
4577  */
4578 static int nfs4_init_slot_tables(struct nfs4_session *session)
4579 {
4580         int status;
4581
4582         status = nfs4_init_slot_table(&session->fc_slot_table,
4583                         session->fc_attrs.max_reqs, 1);
4584         if (status)
4585                 return status;
4586
4587         status = nfs4_init_slot_table(&session->bc_slot_table,
4588                         session->bc_attrs.max_reqs, 0);
4589         if (status)
4590                 nfs4_destroy_slot_tables(session);
4591
4592         return status;
4593 }
4594
4595 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
4596 {
4597         struct nfs4_session *session;
4598         struct nfs4_slot_table *tbl;
4599
4600         session = kzalloc(sizeof(struct nfs4_session), GFP_KERNEL);
4601         if (!session)
4602                 return NULL;
4603
4604         /*
4605          * The create session reply races with the server back
4606          * channel probe. Mark the client NFS_CS_SESSION_INITING
4607          * so that the client back channel can find the
4608          * nfs_client struct
4609          */
4610         clp->cl_cons_state = NFS_CS_SESSION_INITING;
4611
4612         tbl = &session->fc_slot_table;
4613         spin_lock_init(&tbl->slot_tbl_lock);
4614         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
4615
4616         tbl = &session->bc_slot_table;
4617         spin_lock_init(&tbl->slot_tbl_lock);
4618         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
4619
4620         session->clp = clp;
4621         return session;
4622 }
4623
4624 void nfs4_destroy_session(struct nfs4_session *session)
4625 {
4626         nfs4_proc_destroy_session(session);
4627         dprintk("%s Destroy backchannel for xprt %p\n",
4628                 __func__, session->clp->cl_rpcclient->cl_xprt);
4629         xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
4630                                 NFS41_BC_MIN_CALLBACKS);
4631         nfs4_destroy_slot_tables(session);
4632         kfree(session);
4633 }
4634
4635 /*
4636  * Initialize the values to be used by the client in CREATE_SESSION
4637  * If nfs4_init_session set the fore channel request and response sizes,
4638  * use them.
4639  *
4640  * Set the back channel max_resp_sz_cached to zero to force the client to
4641  * always set csa_cachethis to FALSE because the current implementation
4642  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
4643  */
4644 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
4645 {
4646         struct nfs4_session *session = args->client->cl_session;
4647         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
4648                      mxresp_sz = session->fc_attrs.max_resp_sz;
4649
4650         if (mxrqst_sz == 0)
4651                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
4652         if (mxresp_sz == 0)
4653                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
4654         /* Fore channel attributes */
4655         args->fc_attrs.headerpadsz = 0;
4656         args->fc_attrs.max_rqst_sz = mxrqst_sz;
4657         args->fc_attrs.max_resp_sz = mxresp_sz;
4658         args->fc_attrs.max_resp_sz_cached = mxresp_sz;
4659         args->fc_attrs.max_ops = NFS4_MAX_OPS;
4660         args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;
4661
4662         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
4663                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
4664                 __func__,
4665                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
4666                 args->fc_attrs.max_resp_sz_cached, args->fc_attrs.max_ops,
4667                 args->fc_attrs.max_reqs);
4668
4669         /* Back channel attributes */
4670         args->bc_attrs.headerpadsz = 0;
4671         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
4672         args->bc_attrs.max_resp_sz = PAGE_SIZE;
4673         args->bc_attrs.max_resp_sz_cached = 0;
4674         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
4675         args->bc_attrs.max_reqs = 1;
4676
4677         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
4678                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
4679                 __func__,
4680                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
4681                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
4682                 args->bc_attrs.max_reqs);
4683 }
4684
4685 static int _verify_channel_attr(char *chan, char *attr_name, u32 sent, u32 rcvd)
4686 {
4687         if (rcvd <= sent)
4688                 return 0;
4689         printk(KERN_WARNING "%s: Session INVALID: %s channel %s increased. "
4690                 "sent=%u rcvd=%u\n", __func__, chan, attr_name, sent, rcvd);
4691         return -EINVAL;
4692 }
4693
4694 #define _verify_fore_channel_attr(_name_) \
4695         _verify_channel_attr("fore", #_name_, \
4696                              args->fc_attrs._name_, \
4697                              session->fc_attrs._name_)
4698
4699 #define _verify_back_channel_attr(_name_) \
4700         _verify_channel_attr("back", #_name_, \
4701                              args->bc_attrs._name_, \
4702                              session->bc_attrs._name_)
4703
4704 /*
4705  * The server is not allowed to increase the fore channel header pad size,
4706  * maximum response size, or maximum number of operations.
4707  *
4708  * The back channel attributes are only negotiatied down: We send what the
4709  * (back channel) server insists upon.
4710  */
4711 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
4712                                      struct nfs4_session *session)
4713 {
4714         int ret = 0;
4715
4716         ret |= _verify_fore_channel_attr(headerpadsz);
4717         ret |= _verify_fore_channel_attr(max_resp_sz);
4718         ret |= _verify_fore_channel_attr(max_ops);
4719
4720         ret |= _verify_back_channel_attr(headerpadsz);
4721         ret |= _verify_back_channel_attr(max_rqst_sz);
4722         ret |= _verify_back_channel_attr(max_resp_sz);
4723         ret |= _verify_back_channel_attr(max_resp_sz_cached);
4724         ret |= _verify_back_channel_attr(max_ops);
4725         ret |= _verify_back_channel_attr(max_reqs);
4726
4727         return ret;
4728 }
4729
4730 static int _nfs4_proc_create_session(struct nfs_client *clp)
4731 {
4732         struct nfs4_session *session = clp->cl_session;
4733         struct nfs41_create_session_args args = {
4734                 .client = clp,
4735                 .cb_program = NFS4_CALLBACK,
4736         };
4737         struct nfs41_create_session_res res = {
4738                 .client = clp,
4739         };
4740         struct rpc_message msg = {
4741                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
4742                 .rpc_argp = &args,
4743                 .rpc_resp = &res,
4744         };
4745         int status;
4746
4747         nfs4_init_channel_attrs(&args);
4748         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
4749
4750         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
4751
4752         if (!status)
4753                 /* Verify the session's negotiated channel_attrs values */
4754                 status = nfs4_verify_channel_attrs(&args, session);
4755         if (!status) {
4756                 /* Increment the clientid slot sequence id */
4757                 clp->cl_seqid++;
4758         }
4759
4760         return status;
4761 }
4762
4763 /*
4764  * Issues a CREATE_SESSION operation to the server.
4765  * It is the responsibility of the caller to verify the session is
4766  * expired before calling this routine.
4767  */
4768 int nfs4_proc_create_session(struct nfs_client *clp, int reset)
4769 {
4770         int status;
4771         unsigned *ptr;
4772         struct nfs_fsinfo fsinfo;
4773         struct nfs4_session *session = clp->cl_session;
4774
4775         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
4776
4777         status = _nfs4_proc_create_session(clp);
4778         if (status)
4779                 goto out;
4780
4781         /* Init or reset the fore channel */
4782         if (reset)
4783                 status = nfs4_reset_slot_tables(session);
4784         else
4785                 status = nfs4_init_slot_tables(session);
4786         dprintk("fore channel slot table initialization returned %d\n", status);
4787         if (status)
4788                 goto out;
4789
4790         ptr = (unsigned *)&session->sess_id.data[0];
4791         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
4792                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
4793
4794         if (reset)
4795                 /* Lease time is aleady set */
4796                 goto out;
4797
4798         /* Get the lease time */
4799         status = nfs4_proc_get_lease_time(clp, &fsinfo);
4800         if (status == 0) {
4801                 /* Update lease time and schedule renewal */
4802                 spin_lock(&clp->cl_lock);
4803                 clp->cl_lease_time = fsinfo.lease_time * HZ;
4804                 clp->cl_last_renewal = jiffies;
4805                 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
4806                 spin_unlock(&clp->cl_lock);
4807
4808                 nfs4_schedule_state_renewal(clp);
4809         }
4810 out:
4811         dprintk("<-- %s\n", __func__);
4812         return status;
4813 }
4814
4815 /*
4816  * Issue the over-the-wire RPC DESTROY_SESSION.
4817  * The caller must serialize access to this routine.
4818  */
4819 int nfs4_proc_destroy_session(struct nfs4_session *session)
4820 {
4821         int status = 0;
4822         struct rpc_message msg;
4823
4824         dprintk("--> nfs4_proc_destroy_session\n");
4825
4826         /* session is still being setup */
4827         if (session->clp->cl_cons_state != NFS_CS_READY)
4828                 return status;
4829
4830         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
4831         msg.rpc_argp = session;
4832         msg.rpc_resp = NULL;
4833         msg.rpc_cred = NULL;
4834         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
4835
4836         if (status)
4837                 printk(KERN_WARNING
4838                         "Got error %d from the server on DESTROY_SESSION. "
4839                         "Session has been destroyed regardless...\n", status);
4840
4841         dprintk("<-- nfs4_proc_destroy_session\n");
4842         return status;
4843 }
4844
4845 int nfs4_init_session(struct nfs_server *server)
4846 {
4847         struct nfs_client *clp = server->nfs_client;
4848         int ret;
4849
4850         if (!nfs4_has_session(clp))
4851                 return 0;
4852
4853         clp->cl_session->fc_attrs.max_rqst_sz = server->wsize;
4854         clp->cl_session->fc_attrs.max_resp_sz = server->rsize;
4855         ret = nfs4_recover_expired_lease(server);
4856         if (!ret)
4857                 ret = nfs4_check_client_ready(clp);
4858         return ret;
4859 }
4860
4861 /*
4862  * Renew the cl_session lease.
4863  */
4864 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
4865 {
4866         struct nfs4_sequence_args args;
4867         struct nfs4_sequence_res res;
4868
4869         struct rpc_message msg = {
4870                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
4871                 .rpc_argp = &args,
4872                 .rpc_resp = &res,
4873                 .rpc_cred = cred,
4874         };
4875
4876         args.sa_cache_this = 0;
4877
4878         return nfs4_call_sync_sequence(clp, clp->cl_rpcclient, &msg, &args,
4879                                        &res, 0);
4880 }
4881
4882 void nfs41_sequence_call_done(struct rpc_task *task, void *data)
4883 {
4884         struct nfs_client *clp = (struct nfs_client *)data;
4885
4886         nfs41_sequence_done(clp, task->tk_msg.rpc_resp, task->tk_status);
4887
4888         if (task->tk_status < 0) {
4889                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
4890
4891                 if (_nfs4_async_handle_error(task, NULL, clp, NULL)
4892                                                                 == -EAGAIN) {
4893                         nfs4_restart_rpc(task, clp);
4894                         return;
4895                 }
4896         }
4897         nfs41_sequence_free_slot(clp, task->tk_msg.rpc_resp);
4898         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
4899
4900         kfree(task->tk_msg.rpc_argp);
4901         kfree(task->tk_msg.rpc_resp);
4902
4903         dprintk("<-- %s\n", __func__);
4904 }
4905
4906 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
4907 {
4908         struct nfs_client *clp;
4909         struct nfs4_sequence_args *args;
4910         struct nfs4_sequence_res *res;
4911
4912         clp = (struct nfs_client *)data;
4913         args = task->tk_msg.rpc_argp;
4914         res = task->tk_msg.rpc_resp;
4915
4916         if (nfs4_setup_sequence(clp, args, res, 0, task))
4917                 return;
4918         rpc_call_start(task);
4919 }
4920
4921 static const struct rpc_call_ops nfs41_sequence_ops = {
4922         .rpc_call_done = nfs41_sequence_call_done,
4923         .rpc_call_prepare = nfs41_sequence_prepare,
4924 };
4925
4926 static int nfs41_proc_async_sequence(struct nfs_client *clp,
4927                                      struct rpc_cred *cred)
4928 {
4929         struct nfs4_sequence_args *args;
4930         struct nfs4_sequence_res *res;
4931         struct rpc_message msg = {
4932                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
4933                 .rpc_cred = cred,
4934         };
4935
4936         args = kzalloc(sizeof(*args), GFP_KERNEL);
4937         if (!args)
4938                 return -ENOMEM;
4939         res = kzalloc(sizeof(*res), GFP_KERNEL);
4940         if (!res) {
4941                 kfree(args);
4942                 return -ENOMEM;
4943         }
4944         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
4945         msg.rpc_argp = args;
4946         msg.rpc_resp = res;
4947
4948         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
4949                               &nfs41_sequence_ops, (void *)clp);
4950 }
4951
4952 #endif /* CONFIG_NFS_V4_1 */
4953
4954 struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
4955         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
4956         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
4957         .recover_open   = nfs4_open_reclaim,
4958         .recover_lock   = nfs4_lock_reclaim,
4959         .establish_clid = nfs4_init_clientid,
4960         .get_clid_cred  = nfs4_get_setclientid_cred,
4961 };
4962
4963 #if defined(CONFIG_NFS_V4_1)
4964 struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
4965         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
4966         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
4967         .recover_open   = nfs4_open_reclaim,
4968         .recover_lock   = nfs4_lock_reclaim,
4969         .establish_clid = nfs41_init_clientid,
4970         .get_clid_cred  = nfs4_get_exchange_id_cred,
4971 };
4972 #endif /* CONFIG_NFS_V4_1 */
4973
4974 struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
4975         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
4976         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
4977         .recover_open   = nfs4_open_expired,
4978         .recover_lock   = nfs4_lock_expired,
4979         .establish_clid = nfs4_init_clientid,
4980         .get_clid_cred  = nfs4_get_setclientid_cred,
4981 };
4982
4983 #if defined(CONFIG_NFS_V4_1)
4984 struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
4985         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
4986         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
4987         .recover_open   = nfs4_open_expired,
4988         .recover_lock   = nfs4_lock_expired,
4989         .establish_clid = nfs41_init_clientid,
4990         .get_clid_cred  = nfs4_get_exchange_id_cred,
4991 };
4992 #endif /* CONFIG_NFS_V4_1 */
4993
4994 struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
4995         .sched_state_renewal = nfs4_proc_async_renew,
4996         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
4997         .renew_lease = nfs4_proc_renew,
4998 };
4999
5000 #if defined(CONFIG_NFS_V4_1)
5001 struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
5002         .sched_state_renewal = nfs41_proc_async_sequence,
5003         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
5004         .renew_lease = nfs4_proc_sequence,
5005 };
5006 #endif
5007
5008 /*
5009  * Per minor version reboot and network partition recovery ops
5010  */
5011
5012 struct nfs4_state_recovery_ops *nfs4_reboot_recovery_ops[] = {
5013         &nfs40_reboot_recovery_ops,
5014 #if defined(CONFIG_NFS_V4_1)
5015         &nfs41_reboot_recovery_ops,
5016 #endif
5017 };
5018
5019 struct nfs4_state_recovery_ops *nfs4_nograce_recovery_ops[] = {
5020         &nfs40_nograce_recovery_ops,
5021 #if defined(CONFIG_NFS_V4_1)
5022         &nfs41_nograce_recovery_ops,
5023 #endif
5024 };
5025
5026 struct nfs4_state_maintenance_ops *nfs4_state_renewal_ops[] = {
5027         &nfs40_state_renewal_ops,
5028 #if defined(CONFIG_NFS_V4_1)
5029         &nfs41_state_renewal_ops,
5030 #endif
5031 };
5032
5033 static const struct inode_operations nfs4_file_inode_operations = {
5034         .permission     = nfs_permission,
5035         .getattr        = nfs_getattr,
5036         .setattr        = nfs_setattr,
5037         .getxattr       = nfs4_getxattr,
5038         .setxattr       = nfs4_setxattr,
5039         .listxattr      = nfs4_listxattr,
5040 };
5041
5042 const struct nfs_rpc_ops nfs_v4_clientops = {
5043         .version        = 4,                    /* protocol version */
5044         .dentry_ops     = &nfs4_dentry_operations,
5045         .dir_inode_ops  = &nfs4_dir_inode_operations,
5046         .file_inode_ops = &nfs4_file_inode_operations,
5047         .getroot        = nfs4_proc_get_root,
5048         .getattr        = nfs4_proc_getattr,
5049         .setattr        = nfs4_proc_setattr,
5050         .lookupfh       = nfs4_proc_lookupfh,
5051         .lookup         = nfs4_proc_lookup,
5052         .access         = nfs4_proc_access,
5053         .readlink       = nfs4_proc_readlink,
5054         .create         = nfs4_proc_create,
5055         .remove         = nfs4_proc_remove,
5056         .unlink_setup   = nfs4_proc_unlink_setup,
5057         .unlink_done    = nfs4_proc_unlink_done,
5058         .rename         = nfs4_proc_rename,
5059         .link           = nfs4_proc_link,
5060         .symlink        = nfs4_proc_symlink,
5061         .mkdir          = nfs4_proc_mkdir,
5062         .rmdir          = nfs4_proc_remove,
5063         .readdir        = nfs4_proc_readdir,
5064         .mknod          = nfs4_proc_mknod,
5065         .statfs         = nfs4_proc_statfs,
5066         .fsinfo         = nfs4_proc_fsinfo,
5067         .pathconf       = nfs4_proc_pathconf,
5068         .set_capabilities = nfs4_server_capabilities,
5069         .decode_dirent  = nfs4_decode_dirent,
5070         .read_setup     = nfs4_proc_read_setup,
5071         .read_done      = nfs4_read_done,
5072         .write_setup    = nfs4_proc_write_setup,
5073         .write_done     = nfs4_write_done,
5074         .commit_setup   = nfs4_proc_commit_setup,
5075         .commit_done    = nfs4_commit_done,
5076         .lock           = nfs4_proc_lock,
5077         .clear_acl_cache = nfs4_zap_acl_attr,
5078         .close_context  = nfs4_close_context,
5079 };
5080
5081 /*
5082  * Local variables:
5083  *  c-basic-offset: 8
5084  * End:
5085  */