udf: Refuse RW mount of the filesystem instead of making it RO
[linux-3.10.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/ratelimit.h>
43 #include <linux/printk.h>
44 #include <linux/slab.h>
45 #include <linux/sunrpc/clnt.h>
46 #include <linux/nfs.h>
47 #include <linux/nfs4.h>
48 #include <linux/nfs_fs.h>
49 #include <linux/nfs_page.h>
50 #include <linux/nfs_mount.h>
51 #include <linux/namei.h>
52 #include <linux/mount.h>
53 #include <linux/module.h>
54 #include <linux/nfs_idmap.h>
55 #include <linux/xattr.h>
56 #include <linux/utsname.h>
57 #include <linux/freezer.h>
58
59 #include "nfs4_fs.h"
60 #include "delegation.h"
61 #include "internal.h"
62 #include "iostat.h"
63 #include "callback.h"
64 #include "pnfs.h"
65 #include "netns.h"
66 #include "nfs4session.h"
67 #include "fscache.h"
68
69 #define NFSDBG_FACILITY         NFSDBG_PROC
70
71 #define NFS4_POLL_RETRY_MIN     (HZ/10)
72 #define NFS4_POLL_RETRY_MAX     (15*HZ)
73
74 struct nfs4_opendata;
75 static int _nfs4_proc_open(struct nfs4_opendata *data);
76 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
77 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
78 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
79 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
80 static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *);
81 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
82 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
83                             struct nfs_fattr *fattr, struct iattr *sattr,
84                             struct nfs4_state *state);
85 #ifdef CONFIG_NFS_V4_1
86 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *);
87 static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *);
88 #endif
89 /* Prevent leaks of NFSv4 errors into userland */
90 static int nfs4_map_errors(int err)
91 {
92         if (err >= -1000)
93                 return err;
94         switch (err) {
95         case -NFS4ERR_RESOURCE:
96         case -NFS4ERR_LAYOUTTRYLATER:
97         case -NFS4ERR_RECALLCONFLICT:
98                 return -EREMOTEIO;
99         case -NFS4ERR_WRONGSEC:
100                 return -EPERM;
101         case -NFS4ERR_BADOWNER:
102         case -NFS4ERR_BADNAME:
103                 return -EINVAL;
104         case -NFS4ERR_SHARE_DENIED:
105                 return -EACCES;
106         case -NFS4ERR_MINOR_VERS_MISMATCH:
107                 return -EPROTONOSUPPORT;
108         case -NFS4ERR_ACCESS:
109                 return -EACCES;
110         case -NFS4ERR_FILE_OPEN:
111                 return -EBUSY;
112         default:
113                 dprintk("%s could not handle NFSv4 error %d\n",
114                                 __func__, -err);
115                 break;
116         }
117         return -EIO;
118 }
119
120 /*
121  * This is our standard bitmap for GETATTR requests.
122  */
123 const u32 nfs4_fattr_bitmap[3] = {
124         FATTR4_WORD0_TYPE
125         | FATTR4_WORD0_CHANGE
126         | FATTR4_WORD0_SIZE
127         | FATTR4_WORD0_FSID
128         | FATTR4_WORD0_FILEID,
129         FATTR4_WORD1_MODE
130         | FATTR4_WORD1_NUMLINKS
131         | FATTR4_WORD1_OWNER
132         | FATTR4_WORD1_OWNER_GROUP
133         | FATTR4_WORD1_RAWDEV
134         | FATTR4_WORD1_SPACE_USED
135         | FATTR4_WORD1_TIME_ACCESS
136         | FATTR4_WORD1_TIME_METADATA
137         | FATTR4_WORD1_TIME_MODIFY
138 };
139
140 static const u32 nfs4_pnfs_open_bitmap[3] = {
141         FATTR4_WORD0_TYPE
142         | FATTR4_WORD0_CHANGE
143         | FATTR4_WORD0_SIZE
144         | FATTR4_WORD0_FSID
145         | FATTR4_WORD0_FILEID,
146         FATTR4_WORD1_MODE
147         | FATTR4_WORD1_NUMLINKS
148         | FATTR4_WORD1_OWNER
149         | FATTR4_WORD1_OWNER_GROUP
150         | FATTR4_WORD1_RAWDEV
151         | FATTR4_WORD1_SPACE_USED
152         | FATTR4_WORD1_TIME_ACCESS
153         | FATTR4_WORD1_TIME_METADATA
154         | FATTR4_WORD1_TIME_MODIFY,
155         FATTR4_WORD2_MDSTHRESHOLD
156 };
157
158 static const u32 nfs4_open_noattr_bitmap[3] = {
159         FATTR4_WORD0_TYPE
160         | FATTR4_WORD0_CHANGE
161         | FATTR4_WORD0_FILEID,
162 };
163
164 const u32 nfs4_statfs_bitmap[2] = {
165         FATTR4_WORD0_FILES_AVAIL
166         | FATTR4_WORD0_FILES_FREE
167         | FATTR4_WORD0_FILES_TOTAL,
168         FATTR4_WORD1_SPACE_AVAIL
169         | FATTR4_WORD1_SPACE_FREE
170         | FATTR4_WORD1_SPACE_TOTAL
171 };
172
173 const u32 nfs4_pathconf_bitmap[2] = {
174         FATTR4_WORD0_MAXLINK
175         | FATTR4_WORD0_MAXNAME,
176         0
177 };
178
179 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
180                         | FATTR4_WORD0_MAXREAD
181                         | FATTR4_WORD0_MAXWRITE
182                         | FATTR4_WORD0_LEASE_TIME,
183                         FATTR4_WORD1_TIME_DELTA
184                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
185                         FATTR4_WORD2_LAYOUT_BLKSIZE
186 };
187
188 const u32 nfs4_fs_locations_bitmap[2] = {
189         FATTR4_WORD0_TYPE
190         | FATTR4_WORD0_CHANGE
191         | FATTR4_WORD0_SIZE
192         | FATTR4_WORD0_FSID
193         | FATTR4_WORD0_FILEID
194         | FATTR4_WORD0_FS_LOCATIONS,
195         FATTR4_WORD1_MODE
196         | FATTR4_WORD1_NUMLINKS
197         | FATTR4_WORD1_OWNER
198         | FATTR4_WORD1_OWNER_GROUP
199         | FATTR4_WORD1_RAWDEV
200         | FATTR4_WORD1_SPACE_USED
201         | FATTR4_WORD1_TIME_ACCESS
202         | FATTR4_WORD1_TIME_METADATA
203         | FATTR4_WORD1_TIME_MODIFY
204         | FATTR4_WORD1_MOUNTED_ON_FILEID
205 };
206
207 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
208                 struct nfs4_readdir_arg *readdir)
209 {
210         __be32 *start, *p;
211
212         if (cookie > 2) {
213                 readdir->cookie = cookie;
214                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
215                 return;
216         }
217
218         readdir->cookie = 0;
219         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
220         if (cookie == 2)
221                 return;
222         
223         /*
224          * NFSv4 servers do not return entries for '.' and '..'
225          * Therefore, we fake these entries here.  We let '.'
226          * have cookie 0 and '..' have cookie 1.  Note that
227          * when talking to the server, we always send cookie 0
228          * instead of 1 or 2.
229          */
230         start = p = kmap_atomic(*readdir->pages);
231         
232         if (cookie == 0) {
233                 *p++ = xdr_one;                                  /* next */
234                 *p++ = xdr_zero;                   /* cookie, first word */
235                 *p++ = xdr_one;                   /* cookie, second word */
236                 *p++ = xdr_one;                             /* entry len */
237                 memcpy(p, ".\0\0\0", 4);                        /* entry */
238                 p++;
239                 *p++ = xdr_one;                         /* bitmap length */
240                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
241                 *p++ = htonl(8);              /* attribute buffer length */
242                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
243         }
244         
245         *p++ = xdr_one;                                  /* next */
246         *p++ = xdr_zero;                   /* cookie, first word */
247         *p++ = xdr_two;                   /* cookie, second word */
248         *p++ = xdr_two;                             /* entry len */
249         memcpy(p, "..\0\0", 4);                         /* entry */
250         p++;
251         *p++ = xdr_one;                         /* bitmap length */
252         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
253         *p++ = htonl(8);              /* attribute buffer length */
254         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
255
256         readdir->pgbase = (char *)p - (char *)start;
257         readdir->count -= readdir->pgbase;
258         kunmap_atomic(start);
259 }
260
261 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
262 {
263         int res = 0;
264
265         might_sleep();
266
267         if (*timeout <= 0)
268                 *timeout = NFS4_POLL_RETRY_MIN;
269         if (*timeout > NFS4_POLL_RETRY_MAX)
270                 *timeout = NFS4_POLL_RETRY_MAX;
271         freezable_schedule_timeout_killable(*timeout);
272         if (fatal_signal_pending(current))
273                 res = -ERESTARTSYS;
274         *timeout <<= 1;
275         return res;
276 }
277
278 /* This is the error handling routine for processes that are allowed
279  * to sleep.
280  */
281 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
282 {
283         struct nfs_client *clp = server->nfs_client;
284         struct nfs4_state *state = exception->state;
285         struct inode *inode = exception->inode;
286         int ret = errorcode;
287
288         exception->retry = 0;
289         switch(errorcode) {
290                 case 0:
291                         return 0;
292                 case -NFS4ERR_OPENMODE:
293                         if (inode && nfs4_have_delegation(inode, FMODE_READ)) {
294                                 nfs4_inode_return_delegation(inode);
295                                 exception->retry = 1;
296                                 return 0;
297                         }
298                         if (state == NULL)
299                                 break;
300                         ret = nfs4_schedule_stateid_recovery(server, state);
301                         if (ret < 0)
302                                 break;
303                         goto wait_on_recovery;
304                 case -NFS4ERR_DELEG_REVOKED:
305                 case -NFS4ERR_ADMIN_REVOKED:
306                 case -NFS4ERR_BAD_STATEID:
307                         if (inode != NULL && nfs4_have_delegation(inode, FMODE_READ)) {
308                                 nfs_remove_bad_delegation(inode);
309                                 exception->retry = 1;
310                                 break;
311                         }
312                         if (state == NULL)
313                                 break;
314                         ret = nfs4_schedule_stateid_recovery(server, state);
315                         if (ret < 0)
316                                 break;
317                         goto wait_on_recovery;
318                 case -NFS4ERR_EXPIRED:
319                         if (state != NULL) {
320                                 ret = nfs4_schedule_stateid_recovery(server, state);
321                                 if (ret < 0)
322                                         break;
323                         }
324                 case -NFS4ERR_STALE_STATEID:
325                 case -NFS4ERR_STALE_CLIENTID:
326                         nfs4_schedule_lease_recovery(clp);
327                         goto wait_on_recovery;
328 #if defined(CONFIG_NFS_V4_1)
329                 case -NFS4ERR_BADSESSION:
330                 case -NFS4ERR_BADSLOT:
331                 case -NFS4ERR_BAD_HIGH_SLOT:
332                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
333                 case -NFS4ERR_DEADSESSION:
334                 case -NFS4ERR_SEQ_FALSE_RETRY:
335                 case -NFS4ERR_SEQ_MISORDERED:
336                         dprintk("%s ERROR: %d Reset session\n", __func__,
337                                 errorcode);
338                         nfs4_schedule_session_recovery(clp->cl_session, errorcode);
339                         goto wait_on_recovery;
340 #endif /* defined(CONFIG_NFS_V4_1) */
341                 case -NFS4ERR_FILE_OPEN:
342                         if (exception->timeout > HZ) {
343                                 /* We have retried a decent amount, time to
344                                  * fail
345                                  */
346                                 ret = -EBUSY;
347                                 break;
348                         }
349                 case -NFS4ERR_GRACE:
350                 case -NFS4ERR_DELAY:
351                         ret = nfs4_delay(server->client, &exception->timeout);
352                         if (ret != 0)
353                                 break;
354                 case -NFS4ERR_RETRY_UNCACHED_REP:
355                 case -NFS4ERR_OLD_STATEID:
356                         exception->retry = 1;
357                         break;
358                 case -NFS4ERR_BADOWNER:
359                         /* The following works around a Linux server bug! */
360                 case -NFS4ERR_BADNAME:
361                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
362                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
363                                 exception->retry = 1;
364                                 printk(KERN_WARNING "NFS: v4 server %s "
365                                                 "does not accept raw "
366                                                 "uid/gids. "
367                                                 "Reenabling the idmapper.\n",
368                                                 server->nfs_client->cl_hostname);
369                         }
370         }
371         /* We failed to handle the error */
372         return nfs4_map_errors(ret);
373 wait_on_recovery:
374         ret = nfs4_wait_clnt_recover(clp);
375         if (ret == 0)
376                 exception->retry = 1;
377         return ret;
378 }
379
380
381 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
382 {
383         spin_lock(&clp->cl_lock);
384         if (time_before(clp->cl_last_renewal,timestamp))
385                 clp->cl_last_renewal = timestamp;
386         spin_unlock(&clp->cl_lock);
387 }
388
389 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
390 {
391         do_renew_lease(server->nfs_client, timestamp);
392 }
393
394 #if defined(CONFIG_NFS_V4_1)
395
396 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
397 {
398         struct nfs4_session *session;
399         struct nfs4_slot_table *tbl;
400         bool send_new_highest_used_slotid = false;
401
402         if (!res->sr_slot) {
403                 /* just wake up the next guy waiting since
404                  * we may have not consumed a slot after all */
405                 dprintk("%s: No slot\n", __func__);
406                 return;
407         }
408         tbl = res->sr_slot->table;
409         session = tbl->session;
410
411         spin_lock(&tbl->slot_tbl_lock);
412         /* Be nice to the server: try to ensure that the last transmitted
413          * value for highest_user_slotid <= target_highest_slotid
414          */
415         if (tbl->highest_used_slotid > tbl->target_highest_slotid)
416                 send_new_highest_used_slotid = true;
417
418         if (nfs41_wake_and_assign_slot(tbl, res->sr_slot)) {
419                 send_new_highest_used_slotid = false;
420                 goto out_unlock;
421         }
422         nfs4_free_slot(tbl, res->sr_slot);
423
424         if (tbl->highest_used_slotid != NFS4_NO_SLOT)
425                 send_new_highest_used_slotid = false;
426 out_unlock:
427         spin_unlock(&tbl->slot_tbl_lock);
428         res->sr_slot = NULL;
429         if (send_new_highest_used_slotid)
430                 nfs41_server_notify_highest_slotid_update(session->clp);
431 }
432
433 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
434 {
435         struct nfs4_session *session;
436         struct nfs4_slot *slot;
437         struct nfs_client *clp;
438         bool interrupted = false;
439         int ret = 1;
440
441         /* don't increment the sequence number if the task wasn't sent */
442         if (!RPC_WAS_SENT(task))
443                 goto out;
444
445         slot = res->sr_slot;
446         session = slot->table->session;
447
448         if (slot->interrupted) {
449                 slot->interrupted = 0;
450                 interrupted = true;
451         }
452
453         /* Check the SEQUENCE operation status */
454         switch (res->sr_status) {
455         case 0:
456                 /* Update the slot's sequence and clientid lease timer */
457                 ++slot->seq_nr;
458                 clp = session->clp;
459                 do_renew_lease(clp, res->sr_timestamp);
460                 /* Check sequence flags */
461                 if (res->sr_status_flags != 0)
462                         nfs4_schedule_lease_recovery(clp);
463                 nfs41_update_target_slotid(slot->table, slot, res);
464                 break;
465         case 1:
466                 /*
467                  * sr_status remains 1 if an RPC level error occurred.
468                  * The server may or may not have processed the sequence
469                  * operation..
470                  * Mark the slot as having hosted an interrupted RPC call.
471                  */
472                 slot->interrupted = 1;
473                 goto out;
474         case -NFS4ERR_DELAY:
475                 /* The server detected a resend of the RPC call and
476                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
477                  * of RFC5661.
478                  */
479                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
480                         __func__,
481                         slot->slot_nr,
482                         slot->seq_nr);
483                 goto out_retry;
484         case -NFS4ERR_BADSLOT:
485                 /*
486                  * The slot id we used was probably retired. Try again
487                  * using a different slot id.
488                  */
489                 goto retry_nowait;
490         case -NFS4ERR_SEQ_MISORDERED:
491                 /*
492                  * Was the last operation on this sequence interrupted?
493                  * If so, retry after bumping the sequence number.
494                  */
495                 if (interrupted) {
496                         ++slot->seq_nr;
497                         goto retry_nowait;
498                 }
499                 /*
500                  * Could this slot have been previously retired?
501                  * If so, then the server may be expecting seq_nr = 1!
502                  */
503                 if (slot->seq_nr != 1) {
504                         slot->seq_nr = 1;
505                         goto retry_nowait;
506                 }
507                 break;
508         case -NFS4ERR_SEQ_FALSE_RETRY:
509                 ++slot->seq_nr;
510                 goto retry_nowait;
511         default:
512                 /* Just update the slot sequence no. */
513                 ++slot->seq_nr;
514         }
515 out:
516         /* The session may be reset by one of the error handlers. */
517         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
518         nfs41_sequence_free_slot(res);
519         return ret;
520 retry_nowait:
521         if (rpc_restart_call_prepare(task)) {
522                 task->tk_status = 0;
523                 ret = 0;
524         }
525         goto out;
526 out_retry:
527         if (!rpc_restart_call(task))
528                 goto out;
529         rpc_delay(task, NFS4_POLL_RETRY_MAX);
530         return 0;
531 }
532
533 static int nfs4_sequence_done(struct rpc_task *task,
534                                struct nfs4_sequence_res *res)
535 {
536         if (res->sr_slot == NULL)
537                 return 1;
538         return nfs41_sequence_done(task, res);
539 }
540
541 static void nfs41_init_sequence(struct nfs4_sequence_args *args,
542                 struct nfs4_sequence_res *res, int cache_reply)
543 {
544         args->sa_slot = NULL;
545         args->sa_cache_this = 0;
546         args->sa_privileged = 0;
547         if (cache_reply)
548                 args->sa_cache_this = 1;
549         res->sr_slot = NULL;
550 }
551
552 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
553 {
554         args->sa_privileged = 1;
555 }
556
557 int nfs41_setup_sequence(struct nfs4_session *session,
558                                 struct nfs4_sequence_args *args,
559                                 struct nfs4_sequence_res *res,
560                                 struct rpc_task *task)
561 {
562         struct nfs4_slot *slot;
563         struct nfs4_slot_table *tbl;
564
565         dprintk("--> %s\n", __func__);
566         /* slot already allocated? */
567         if (res->sr_slot != NULL)
568                 goto out_success;
569
570         tbl = &session->fc_slot_table;
571
572         task->tk_timeout = 0;
573
574         spin_lock(&tbl->slot_tbl_lock);
575         if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state) &&
576             !args->sa_privileged) {
577                 /* The state manager will wait until the slot table is empty */
578                 dprintk("%s session is draining\n", __func__);
579                 goto out_sleep;
580         }
581
582         slot = nfs4_alloc_slot(tbl);
583         if (IS_ERR(slot)) {
584                 /* If out of memory, try again in 1/4 second */
585                 if (slot == ERR_PTR(-ENOMEM))
586                         task->tk_timeout = HZ >> 2;
587                 dprintk("<-- %s: no free slots\n", __func__);
588                 goto out_sleep;
589         }
590         spin_unlock(&tbl->slot_tbl_lock);
591
592         args->sa_slot = slot;
593
594         dprintk("<-- %s slotid=%d seqid=%d\n", __func__,
595                         slot->slot_nr, slot->seq_nr);
596
597         res->sr_slot = slot;
598         res->sr_timestamp = jiffies;
599         res->sr_status_flags = 0;
600         /*
601          * sr_status is only set in decode_sequence, and so will remain
602          * set to 1 if an rpc level failure occurs.
603          */
604         res->sr_status = 1;
605 out_success:
606         rpc_call_start(task);
607         return 0;
608 out_sleep:
609         /* Privileged tasks are queued with top priority */
610         if (args->sa_privileged)
611                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
612                                 NULL, RPC_PRIORITY_PRIVILEGED);
613         else
614                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
615         spin_unlock(&tbl->slot_tbl_lock);
616         return -EAGAIN;
617 }
618 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
619
620 int nfs4_setup_sequence(const struct nfs_server *server,
621                         struct nfs4_sequence_args *args,
622                         struct nfs4_sequence_res *res,
623                         struct rpc_task *task)
624 {
625         struct nfs4_session *session = nfs4_get_session(server);
626         int ret = 0;
627
628         if (session == NULL) {
629                 rpc_call_start(task);
630                 goto out;
631         }
632
633         dprintk("--> %s clp %p session %p sr_slot %d\n",
634                 __func__, session->clp, session, res->sr_slot ?
635                         res->sr_slot->slot_nr : -1);
636
637         ret = nfs41_setup_sequence(session, args, res, task);
638 out:
639         dprintk("<-- %s status=%d\n", __func__, ret);
640         return ret;
641 }
642
643 struct nfs41_call_sync_data {
644         const struct nfs_server *seq_server;
645         struct nfs4_sequence_args *seq_args;
646         struct nfs4_sequence_res *seq_res;
647 };
648
649 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
650 {
651         struct nfs41_call_sync_data *data = calldata;
652         struct nfs4_session *session = nfs4_get_session(data->seq_server);
653
654         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
655
656         nfs41_setup_sequence(session, data->seq_args, data->seq_res, task);
657 }
658
659 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
660 {
661         struct nfs41_call_sync_data *data = calldata;
662
663         nfs41_sequence_done(task, data->seq_res);
664 }
665
666 static const struct rpc_call_ops nfs41_call_sync_ops = {
667         .rpc_call_prepare = nfs41_call_sync_prepare,
668         .rpc_call_done = nfs41_call_sync_done,
669 };
670
671 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
672                                    struct nfs_server *server,
673                                    struct rpc_message *msg,
674                                    struct nfs4_sequence_args *args,
675                                    struct nfs4_sequence_res *res)
676 {
677         int ret;
678         struct rpc_task *task;
679         struct nfs41_call_sync_data data = {
680                 .seq_server = server,
681                 .seq_args = args,
682                 .seq_res = res,
683         };
684         struct rpc_task_setup task_setup = {
685                 .rpc_client = clnt,
686                 .rpc_message = msg,
687                 .callback_ops = &nfs41_call_sync_ops,
688                 .callback_data = &data
689         };
690
691         task = rpc_run_task(&task_setup);
692         if (IS_ERR(task))
693                 ret = PTR_ERR(task);
694         else {
695                 ret = task->tk_status;
696                 rpc_put_task(task);
697         }
698         return ret;
699 }
700
701 #else
702 static
703 void nfs41_init_sequence(struct nfs4_sequence_args *args,
704                 struct nfs4_sequence_res *res, int cache_reply)
705 {
706 }
707
708 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
709 {
710 }
711
712
713 static int nfs4_sequence_done(struct rpc_task *task,
714                                struct nfs4_sequence_res *res)
715 {
716         return 1;
717 }
718 #endif /* CONFIG_NFS_V4_1 */
719
720 static
721 int _nfs4_call_sync(struct rpc_clnt *clnt,
722                     struct nfs_server *server,
723                     struct rpc_message *msg,
724                     struct nfs4_sequence_args *args,
725                     struct nfs4_sequence_res *res)
726 {
727         return rpc_call_sync(clnt, msg, 0);
728 }
729
730 static
731 int nfs4_call_sync(struct rpc_clnt *clnt,
732                    struct nfs_server *server,
733                    struct rpc_message *msg,
734                    struct nfs4_sequence_args *args,
735                    struct nfs4_sequence_res *res,
736                    int cache_reply)
737 {
738         nfs41_init_sequence(args, res, cache_reply);
739         return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
740                                                 args, res);
741 }
742
743 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
744 {
745         struct nfs_inode *nfsi = NFS_I(dir);
746
747         spin_lock(&dir->i_lock);
748         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
749         if (!cinfo->atomic || cinfo->before != dir->i_version)
750                 nfs_force_lookup_revalidate(dir);
751         dir->i_version = cinfo->after;
752         nfs_fscache_invalidate(dir);
753         spin_unlock(&dir->i_lock);
754 }
755
756 struct nfs4_opendata {
757         struct kref kref;
758         struct nfs_openargs o_arg;
759         struct nfs_openres o_res;
760         struct nfs_open_confirmargs c_arg;
761         struct nfs_open_confirmres c_res;
762         struct nfs4_string owner_name;
763         struct nfs4_string group_name;
764         struct nfs_fattr f_attr;
765         struct dentry *dir;
766         struct dentry *dentry;
767         struct nfs4_state_owner *owner;
768         struct nfs4_state *state;
769         struct iattr attrs;
770         unsigned long timestamp;
771         unsigned int rpc_done : 1;
772         unsigned int is_recover : 1;
773         int rpc_status;
774         int cancelled;
775 };
776
777 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
778                 int err, struct nfs4_exception *exception)
779 {
780         if (err != -EINVAL)
781                 return false;
782         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
783                 return false;
784         server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
785         exception->retry = 1;
786         return true;
787 }
788
789 static enum open_claim_type4
790 nfs4_map_atomic_open_claim(struct nfs_server *server,
791                 enum open_claim_type4 claim)
792 {
793         if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
794                 return claim;
795         switch (claim) {
796         default:
797                 return claim;
798         case NFS4_OPEN_CLAIM_FH:
799                 return NFS4_OPEN_CLAIM_NULL;
800         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
801                 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
802         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
803                 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
804         }
805 }
806
807 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
808 {
809         p->o_res.f_attr = &p->f_attr;
810         p->o_res.seqid = p->o_arg.seqid;
811         p->c_res.seqid = p->c_arg.seqid;
812         p->o_res.server = p->o_arg.server;
813         p->o_res.access_request = p->o_arg.access;
814         nfs_fattr_init(&p->f_attr);
815         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
816 }
817
818 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
819                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
820                 const struct iattr *attrs,
821                 enum open_claim_type4 claim,
822                 gfp_t gfp_mask)
823 {
824         struct dentry *parent = dget_parent(dentry);
825         struct inode *dir = parent->d_inode;
826         struct nfs_server *server = NFS_SERVER(dir);
827         struct nfs4_opendata *p;
828
829         p = kzalloc(sizeof(*p), gfp_mask);
830         if (p == NULL)
831                 goto err;
832         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
833         if (p->o_arg.seqid == NULL)
834                 goto err_free;
835         nfs_sb_active(dentry->d_sb);
836         p->dentry = dget(dentry);
837         p->dir = parent;
838         p->owner = sp;
839         atomic_inc(&sp->so_count);
840         p->o_arg.open_flags = flags;
841         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
842         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
843          * will return permission denied for all bits until close */
844         if (!(flags & O_EXCL)) {
845                 /* ask server to check for all possible rights as results
846                  * are cached */
847                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
848                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
849         }
850         p->o_arg.clientid = server->nfs_client->cl_clientid;
851         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
852         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
853         p->o_arg.name = &dentry->d_name;
854         p->o_arg.server = server;
855         p->o_arg.bitmask = server->attr_bitmask;
856         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
857         p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
858         switch (p->o_arg.claim) {
859         case NFS4_OPEN_CLAIM_NULL:
860         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
861         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
862                 p->o_arg.fh = NFS_FH(dir);
863                 break;
864         case NFS4_OPEN_CLAIM_PREVIOUS:
865         case NFS4_OPEN_CLAIM_FH:
866         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
867         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
868                 p->o_arg.fh = NFS_FH(dentry->d_inode);
869         }
870         if (attrs != NULL && attrs->ia_valid != 0) {
871                 __be32 verf[2];
872
873                 p->o_arg.u.attrs = &p->attrs;
874                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
875
876                 verf[0] = jiffies;
877                 verf[1] = current->pid;
878                 memcpy(p->o_arg.u.verifier.data, verf,
879                                 sizeof(p->o_arg.u.verifier.data));
880         }
881         p->c_arg.fh = &p->o_res.fh;
882         p->c_arg.stateid = &p->o_res.stateid;
883         p->c_arg.seqid = p->o_arg.seqid;
884         nfs4_init_opendata_res(p);
885         kref_init(&p->kref);
886         return p;
887 err_free:
888         kfree(p);
889 err:
890         dput(parent);
891         return NULL;
892 }
893
894 static void nfs4_opendata_free(struct kref *kref)
895 {
896         struct nfs4_opendata *p = container_of(kref,
897                         struct nfs4_opendata, kref);
898         struct super_block *sb = p->dentry->d_sb;
899
900         nfs_free_seqid(p->o_arg.seqid);
901         if (p->state != NULL)
902                 nfs4_put_open_state(p->state);
903         nfs4_put_state_owner(p->owner);
904         dput(p->dir);
905         dput(p->dentry);
906         nfs_sb_deactive(sb);
907         nfs_fattr_free_names(&p->f_attr);
908         kfree(p);
909 }
910
911 static void nfs4_opendata_put(struct nfs4_opendata *p)
912 {
913         if (p != NULL)
914                 kref_put(&p->kref, nfs4_opendata_free);
915 }
916
917 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
918 {
919         int ret;
920
921         ret = rpc_wait_for_completion_task(task);
922         return ret;
923 }
924
925 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
926 {
927         int ret = 0;
928
929         if (open_mode & (O_EXCL|O_TRUNC))
930                 goto out;
931         switch (mode & (FMODE_READ|FMODE_WRITE)) {
932                 case FMODE_READ:
933                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
934                                 && state->n_rdonly != 0;
935                         break;
936                 case FMODE_WRITE:
937                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
938                                 && state->n_wronly != 0;
939                         break;
940                 case FMODE_READ|FMODE_WRITE:
941                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
942                                 && state->n_rdwr != 0;
943         }
944 out:
945         return ret;
946 }
947
948 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
949 {
950         if (delegation == NULL)
951                 return 0;
952         if ((delegation->type & fmode) != fmode)
953                 return 0;
954         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
955                 return 0;
956         if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
957                 return 0;
958         nfs_mark_delegation_referenced(delegation);
959         return 1;
960 }
961
962 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
963 {
964         switch (fmode) {
965                 case FMODE_WRITE:
966                         state->n_wronly++;
967                         break;
968                 case FMODE_READ:
969                         state->n_rdonly++;
970                         break;
971                 case FMODE_READ|FMODE_WRITE:
972                         state->n_rdwr++;
973         }
974         nfs4_state_set_mode_locked(state, state->state | fmode);
975 }
976
977 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
978 {
979         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
980                 nfs4_stateid_copy(&state->stateid, stateid);
981         nfs4_stateid_copy(&state->open_stateid, stateid);
982         set_bit(NFS_OPEN_STATE, &state->flags);
983         switch (fmode) {
984                 case FMODE_READ:
985                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
986                         break;
987                 case FMODE_WRITE:
988                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
989                         break;
990                 case FMODE_READ|FMODE_WRITE:
991                         set_bit(NFS_O_RDWR_STATE, &state->flags);
992         }
993 }
994
995 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
996 {
997         write_seqlock(&state->seqlock);
998         nfs_set_open_stateid_locked(state, stateid, fmode);
999         write_sequnlock(&state->seqlock);
1000 }
1001
1002 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
1003 {
1004         /*
1005          * Protect the call to nfs4_state_set_mode_locked and
1006          * serialise the stateid update
1007          */
1008         write_seqlock(&state->seqlock);
1009         if (deleg_stateid != NULL) {
1010                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1011                 set_bit(NFS_DELEGATED_STATE, &state->flags);
1012         }
1013         if (open_stateid != NULL)
1014                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
1015         write_sequnlock(&state->seqlock);
1016         spin_lock(&state->owner->so_lock);
1017         update_open_stateflags(state, fmode);
1018         spin_unlock(&state->owner->so_lock);
1019 }
1020
1021 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
1022 {
1023         struct nfs_inode *nfsi = NFS_I(state->inode);
1024         struct nfs_delegation *deleg_cur;
1025         int ret = 0;
1026
1027         fmode &= (FMODE_READ|FMODE_WRITE);
1028
1029         rcu_read_lock();
1030         deleg_cur = rcu_dereference(nfsi->delegation);
1031         if (deleg_cur == NULL)
1032                 goto no_delegation;
1033
1034         spin_lock(&deleg_cur->lock);
1035         if (nfsi->delegation != deleg_cur ||
1036            test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1037             (deleg_cur->type & fmode) != fmode)
1038                 goto no_delegation_unlock;
1039
1040         if (delegation == NULL)
1041                 delegation = &deleg_cur->stateid;
1042         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1043                 goto no_delegation_unlock;
1044
1045         nfs_mark_delegation_referenced(deleg_cur);
1046         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1047         ret = 1;
1048 no_delegation_unlock:
1049         spin_unlock(&deleg_cur->lock);
1050 no_delegation:
1051         rcu_read_unlock();
1052
1053         if (!ret && open_stateid != NULL) {
1054                 __update_open_stateid(state, open_stateid, NULL, fmode);
1055                 ret = 1;
1056         }
1057
1058         return ret;
1059 }
1060
1061
1062 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1063 {
1064         struct nfs_delegation *delegation;
1065
1066         rcu_read_lock();
1067         delegation = rcu_dereference(NFS_I(inode)->delegation);
1068         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1069                 rcu_read_unlock();
1070                 return;
1071         }
1072         rcu_read_unlock();
1073         nfs4_inode_return_delegation(inode);
1074 }
1075
1076 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1077 {
1078         struct nfs4_state *state = opendata->state;
1079         struct nfs_inode *nfsi = NFS_I(state->inode);
1080         struct nfs_delegation *delegation;
1081         int open_mode = opendata->o_arg.open_flags;
1082         fmode_t fmode = opendata->o_arg.fmode;
1083         nfs4_stateid stateid;
1084         int ret = -EAGAIN;
1085
1086         for (;;) {
1087                 if (can_open_cached(state, fmode, open_mode)) {
1088                         spin_lock(&state->owner->so_lock);
1089                         if (can_open_cached(state, fmode, open_mode)) {
1090                                 update_open_stateflags(state, fmode);
1091                                 spin_unlock(&state->owner->so_lock);
1092                                 goto out_return_state;
1093                         }
1094                         spin_unlock(&state->owner->so_lock);
1095                 }
1096                 rcu_read_lock();
1097                 delegation = rcu_dereference(nfsi->delegation);
1098                 if (!can_open_delegated(delegation, fmode)) {
1099                         rcu_read_unlock();
1100                         break;
1101                 }
1102                 /* Save the delegation */
1103                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1104                 rcu_read_unlock();
1105                 nfs_release_seqid(opendata->o_arg.seqid);
1106                 if (!opendata->is_recover) {
1107                         ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1108                         if (ret != 0)
1109                                 goto out;
1110                 }
1111                 ret = -EAGAIN;
1112
1113                 /* Try to update the stateid using the delegation */
1114                 if (update_open_stateid(state, NULL, &stateid, fmode))
1115                         goto out_return_state;
1116         }
1117 out:
1118         return ERR_PTR(ret);
1119 out_return_state:
1120         atomic_inc(&state->count);
1121         return state;
1122 }
1123
1124 static void
1125 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1126 {
1127         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1128         struct nfs_delegation *delegation;
1129         int delegation_flags = 0;
1130
1131         rcu_read_lock();
1132         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1133         if (delegation)
1134                 delegation_flags = delegation->flags;
1135         rcu_read_unlock();
1136         if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1137                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1138                                    "returning a delegation for "
1139                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1140                                    clp->cl_hostname);
1141         } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1142                 nfs_inode_set_delegation(state->inode,
1143                                          data->owner->so_cred,
1144                                          &data->o_res);
1145         else
1146                 nfs_inode_reclaim_delegation(state->inode,
1147                                              data->owner->so_cred,
1148                                              &data->o_res);
1149 }
1150
1151 /*
1152  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1153  * and update the nfs4_state.
1154  */
1155 static struct nfs4_state *
1156 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1157 {
1158         struct inode *inode = data->state->inode;
1159         struct nfs4_state *state = data->state;
1160         int ret;
1161
1162         if (!data->rpc_done) {
1163                 ret = data->rpc_status;
1164                 goto err;
1165         }
1166
1167         ret = -ESTALE;
1168         if (!(data->f_attr.valid & NFS_ATTR_FATTR_TYPE) ||
1169             !(data->f_attr.valid & NFS_ATTR_FATTR_FILEID) ||
1170             !(data->f_attr.valid & NFS_ATTR_FATTR_CHANGE))
1171                 goto err;
1172
1173         ret = -ENOMEM;
1174         state = nfs4_get_open_state(inode, data->owner);
1175         if (state == NULL)
1176                 goto err;
1177
1178         ret = nfs_refresh_inode(inode, &data->f_attr);
1179         if (ret)
1180                 goto err;
1181
1182         if (data->o_res.delegation_type != 0)
1183                 nfs4_opendata_check_deleg(data, state);
1184         update_open_stateid(state, &data->o_res.stateid, NULL,
1185                             data->o_arg.fmode);
1186
1187         return state;
1188 err:
1189         return ERR_PTR(ret);
1190
1191 }
1192
1193 static struct nfs4_state *
1194 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1195 {
1196         struct inode *inode;
1197         struct nfs4_state *state = NULL;
1198         int ret;
1199
1200         if (!data->rpc_done) {
1201                 state = nfs4_try_open_cached(data);
1202                 goto out;
1203         }
1204
1205         ret = -EAGAIN;
1206         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1207                 goto err;
1208         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1209         ret = PTR_ERR(inode);
1210         if (IS_ERR(inode))
1211                 goto err;
1212         ret = -ENOMEM;
1213         state = nfs4_get_open_state(inode, data->owner);
1214         if (state == NULL)
1215                 goto err_put_inode;
1216         if (data->o_res.delegation_type != 0)
1217                 nfs4_opendata_check_deleg(data, state);
1218         update_open_stateid(state, &data->o_res.stateid, NULL,
1219                         data->o_arg.fmode);
1220         iput(inode);
1221 out:
1222         nfs_release_seqid(data->o_arg.seqid);
1223         return state;
1224 err_put_inode:
1225         iput(inode);
1226 err:
1227         return ERR_PTR(ret);
1228 }
1229
1230 static struct nfs4_state *
1231 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1232 {
1233         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1234                 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1235         return _nfs4_opendata_to_nfs4_state(data);
1236 }
1237
1238 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1239 {
1240         struct nfs_inode *nfsi = NFS_I(state->inode);
1241         struct nfs_open_context *ctx;
1242
1243         spin_lock(&state->inode->i_lock);
1244         list_for_each_entry(ctx, &nfsi->open_files, list) {
1245                 if (ctx->state != state)
1246                         continue;
1247                 get_nfs_open_context(ctx);
1248                 spin_unlock(&state->inode->i_lock);
1249                 return ctx;
1250         }
1251         spin_unlock(&state->inode->i_lock);
1252         return ERR_PTR(-ENOENT);
1253 }
1254
1255 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
1256                 struct nfs4_state *state, enum open_claim_type4 claim)
1257 {
1258         struct nfs4_opendata *opendata;
1259
1260         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
1261                         NULL, claim, GFP_NOFS);
1262         if (opendata == NULL)
1263                 return ERR_PTR(-ENOMEM);
1264         opendata->state = state;
1265         atomic_inc(&state->count);
1266         return opendata;
1267 }
1268
1269 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1270 {
1271         struct nfs4_state *newstate;
1272         int ret;
1273
1274         opendata->o_arg.open_flags = 0;
1275         opendata->o_arg.fmode = fmode;
1276         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1277         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1278         nfs4_init_opendata_res(opendata);
1279         ret = _nfs4_recover_proc_open(opendata);
1280         if (ret != 0)
1281                 return ret; 
1282         newstate = nfs4_opendata_to_nfs4_state(opendata);
1283         if (IS_ERR(newstate))
1284                 return PTR_ERR(newstate);
1285         nfs4_close_state(newstate, fmode);
1286         *res = newstate;
1287         return 0;
1288 }
1289
1290 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1291 {
1292         struct nfs4_state *newstate;
1293         int ret;
1294
1295         /* memory barrier prior to reading state->n_* */
1296         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1297         clear_bit(NFS_OPEN_STATE, &state->flags);
1298         smp_rmb();
1299         if (state->n_rdwr != 0) {
1300                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1301                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1302                 if (ret != 0)
1303                         return ret;
1304                 if (newstate != state)
1305                         return -ESTALE;
1306         }
1307         if (state->n_wronly != 0) {
1308                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1309                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1310                 if (ret != 0)
1311                         return ret;
1312                 if (newstate != state)
1313                         return -ESTALE;
1314         }
1315         if (state->n_rdonly != 0) {
1316                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1317                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1318                 if (ret != 0)
1319                         return ret;
1320                 if (newstate != state)
1321                         return -ESTALE;
1322         }
1323         /*
1324          * We may have performed cached opens for all three recoveries.
1325          * Check if we need to update the current stateid.
1326          */
1327         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1328             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1329                 write_seqlock(&state->seqlock);
1330                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1331                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1332                 write_sequnlock(&state->seqlock);
1333         }
1334         return 0;
1335 }
1336
1337 /*
1338  * OPEN_RECLAIM:
1339  *      reclaim state on the server after a reboot.
1340  */
1341 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1342 {
1343         struct nfs_delegation *delegation;
1344         struct nfs4_opendata *opendata;
1345         fmode_t delegation_type = 0;
1346         int status;
1347
1348         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1349                         NFS4_OPEN_CLAIM_PREVIOUS);
1350         if (IS_ERR(opendata))
1351                 return PTR_ERR(opendata);
1352         rcu_read_lock();
1353         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1354         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1355                 delegation_type = delegation->type;
1356         rcu_read_unlock();
1357         opendata->o_arg.u.delegation_type = delegation_type;
1358         status = nfs4_open_recover(opendata, state);
1359         nfs4_opendata_put(opendata);
1360         return status;
1361 }
1362
1363 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1364 {
1365         struct nfs_server *server = NFS_SERVER(state->inode);
1366         struct nfs4_exception exception = { };
1367         int err;
1368         do {
1369                 err = _nfs4_do_open_reclaim(ctx, state);
1370                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1371                         continue;
1372                 if (err != -NFS4ERR_DELAY)
1373                         break;
1374                 nfs4_handle_exception(server, err, &exception);
1375         } while (exception.retry);
1376         return err;
1377 }
1378
1379 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1380 {
1381         struct nfs_open_context *ctx;
1382         int ret;
1383
1384         ctx = nfs4_state_find_open_context(state);
1385         if (IS_ERR(ctx))
1386                 return -EAGAIN;
1387         ret = nfs4_do_open_reclaim(ctx, state);
1388         put_nfs_open_context(ctx);
1389         return ret;
1390 }
1391
1392 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, int err)
1393 {
1394         switch (err) {
1395                 default:
1396                         printk(KERN_ERR "NFS: %s: unhandled error "
1397                                         "%d.\n", __func__, err);
1398                 case 0:
1399                 case -ENOENT:
1400                 case -ESTALE:
1401                         break;
1402                 case -NFS4ERR_BADSESSION:
1403                 case -NFS4ERR_BADSLOT:
1404                 case -NFS4ERR_BAD_HIGH_SLOT:
1405                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1406                 case -NFS4ERR_DEADSESSION:
1407                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1408                         nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1409                         return -EAGAIN;
1410                 case -NFS4ERR_STALE_CLIENTID:
1411                 case -NFS4ERR_STALE_STATEID:
1412                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1413                 case -NFS4ERR_EXPIRED:
1414                         /* Don't recall a delegation if it was lost */
1415                         nfs4_schedule_lease_recovery(server->nfs_client);
1416                         return -EAGAIN;
1417                 case -NFS4ERR_DELEG_REVOKED:
1418                 case -NFS4ERR_ADMIN_REVOKED:
1419                 case -NFS4ERR_BAD_STATEID:
1420                 case -NFS4ERR_OPENMODE:
1421                         nfs_inode_find_state_and_recover(state->inode,
1422                                         stateid);
1423                         nfs4_schedule_stateid_recovery(server, state);
1424                         return 0;
1425                 case -NFS4ERR_DELAY:
1426                 case -NFS4ERR_GRACE:
1427                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1428                         ssleep(1);
1429                         return -EAGAIN;
1430                 case -ENOMEM:
1431                 case -NFS4ERR_DENIED:
1432                         /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1433                         return 0;
1434         }
1435         return err;
1436 }
1437
1438 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1439 {
1440         struct nfs_server *server = NFS_SERVER(state->inode);
1441         struct nfs4_opendata *opendata;
1442         int err;
1443
1444         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1445                         NFS4_OPEN_CLAIM_DELEG_CUR_FH);
1446         if (IS_ERR(opendata))
1447                 return PTR_ERR(opendata);
1448         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1449         err = nfs4_open_recover(opendata, state);
1450         nfs4_opendata_put(opendata);
1451         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
1452 }
1453
1454 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1455 {
1456         struct nfs4_opendata *data = calldata;
1457
1458         data->rpc_status = task->tk_status;
1459         if (data->rpc_status == 0) {
1460                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1461                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1462                 renew_lease(data->o_res.server, data->timestamp);
1463                 data->rpc_done = 1;
1464         }
1465 }
1466
1467 static void nfs4_open_confirm_release(void *calldata)
1468 {
1469         struct nfs4_opendata *data = calldata;
1470         struct nfs4_state *state = NULL;
1471
1472         /* If this request hasn't been cancelled, do nothing */
1473         if (data->cancelled == 0)
1474                 goto out_free;
1475         /* In case of error, no cleanup! */
1476         if (!data->rpc_done)
1477                 goto out_free;
1478         state = nfs4_opendata_to_nfs4_state(data);
1479         if (!IS_ERR(state))
1480                 nfs4_close_state(state, data->o_arg.fmode);
1481 out_free:
1482         nfs4_opendata_put(data);
1483 }
1484
1485 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1486         .rpc_call_done = nfs4_open_confirm_done,
1487         .rpc_release = nfs4_open_confirm_release,
1488 };
1489
1490 /*
1491  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1492  */
1493 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1494 {
1495         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1496         struct rpc_task *task;
1497         struct  rpc_message msg = {
1498                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1499                 .rpc_argp = &data->c_arg,
1500                 .rpc_resp = &data->c_res,
1501                 .rpc_cred = data->owner->so_cred,
1502         };
1503         struct rpc_task_setup task_setup_data = {
1504                 .rpc_client = server->client,
1505                 .rpc_message = &msg,
1506                 .callback_ops = &nfs4_open_confirm_ops,
1507                 .callback_data = data,
1508                 .workqueue = nfsiod_workqueue,
1509                 .flags = RPC_TASK_ASYNC,
1510         };
1511         int status;
1512
1513         kref_get(&data->kref);
1514         data->rpc_done = 0;
1515         data->rpc_status = 0;
1516         data->timestamp = jiffies;
1517         task = rpc_run_task(&task_setup_data);
1518         if (IS_ERR(task))
1519                 return PTR_ERR(task);
1520         status = nfs4_wait_for_completion_rpc_task(task);
1521         if (status != 0) {
1522                 data->cancelled = 1;
1523                 smp_wmb();
1524         } else
1525                 status = data->rpc_status;
1526         rpc_put_task(task);
1527         return status;
1528 }
1529
1530 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1531 {
1532         struct nfs4_opendata *data = calldata;
1533         struct nfs4_state_owner *sp = data->owner;
1534         struct nfs_client *clp = sp->so_server->nfs_client;
1535
1536         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1537                 goto out_wait;
1538         /*
1539          * Check if we still need to send an OPEN call, or if we can use
1540          * a delegation instead.
1541          */
1542         if (data->state != NULL) {
1543                 struct nfs_delegation *delegation;
1544
1545                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1546                         goto out_no_action;
1547                 rcu_read_lock();
1548                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1549                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1550                     data->o_arg.claim != NFS4_OPEN_CLAIM_DELEG_CUR_FH &&
1551                     can_open_delegated(delegation, data->o_arg.fmode))
1552                         goto unlock_no_action;
1553                 rcu_read_unlock();
1554         }
1555         /* Update client id. */
1556         data->o_arg.clientid = clp->cl_clientid;
1557         switch (data->o_arg.claim) {
1558         case NFS4_OPEN_CLAIM_PREVIOUS:
1559         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1560         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1561                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1562         case NFS4_OPEN_CLAIM_FH:
1563                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1564                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1565         }
1566         data->timestamp = jiffies;
1567         if (nfs4_setup_sequence(data->o_arg.server,
1568                                 &data->o_arg.seq_args,
1569                                 &data->o_res.seq_res,
1570                                 task) != 0)
1571                 nfs_release_seqid(data->o_arg.seqid);
1572
1573         /* Set the create mode (note dependency on the session type) */
1574         data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
1575         if (data->o_arg.open_flags & O_EXCL) {
1576                 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
1577                 if (nfs4_has_persistent_session(clp))
1578                         data->o_arg.createmode = NFS4_CREATE_GUARDED;
1579                 else if (clp->cl_mvops->minor_version > 0)
1580                         data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
1581         }
1582         return;
1583 unlock_no_action:
1584         rcu_read_unlock();
1585 out_no_action:
1586         task->tk_action = NULL;
1587 out_wait:
1588         nfs4_sequence_done(task, &data->o_res.seq_res);
1589 }
1590
1591 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1592 {
1593         struct nfs4_opendata *data = calldata;
1594
1595         data->rpc_status = task->tk_status;
1596
1597         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1598                 return;
1599
1600         if (task->tk_status == 0) {
1601                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1602                         switch (data->o_res.f_attr->mode & S_IFMT) {
1603                         case S_IFREG:
1604                                 break;
1605                         case S_IFLNK:
1606                                 data->rpc_status = -ELOOP;
1607                                 break;
1608                         case S_IFDIR:
1609                                 data->rpc_status = -EISDIR;
1610                                 break;
1611                         default:
1612                                 data->rpc_status = -ENOTDIR;
1613                         }
1614                 }
1615                 renew_lease(data->o_res.server, data->timestamp);
1616                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1617                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1618         }
1619         data->rpc_done = 1;
1620 }
1621
1622 static void nfs4_open_release(void *calldata)
1623 {
1624         struct nfs4_opendata *data = calldata;
1625         struct nfs4_state *state = NULL;
1626
1627         /* If this request hasn't been cancelled, do nothing */
1628         if (data->cancelled == 0)
1629                 goto out_free;
1630         /* In case of error, no cleanup! */
1631         if (data->rpc_status != 0 || !data->rpc_done)
1632                 goto out_free;
1633         /* In case we need an open_confirm, no cleanup! */
1634         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1635                 goto out_free;
1636         state = nfs4_opendata_to_nfs4_state(data);
1637         if (!IS_ERR(state))
1638                 nfs4_close_state(state, data->o_arg.fmode);
1639 out_free:
1640         nfs4_opendata_put(data);
1641 }
1642
1643 static const struct rpc_call_ops nfs4_open_ops = {
1644         .rpc_call_prepare = nfs4_open_prepare,
1645         .rpc_call_done = nfs4_open_done,
1646         .rpc_release = nfs4_open_release,
1647 };
1648
1649 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1650 {
1651         struct inode *dir = data->dir->d_inode;
1652         struct nfs_server *server = NFS_SERVER(dir);
1653         struct nfs_openargs *o_arg = &data->o_arg;
1654         struct nfs_openres *o_res = &data->o_res;
1655         struct rpc_task *task;
1656         struct rpc_message msg = {
1657                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1658                 .rpc_argp = o_arg,
1659                 .rpc_resp = o_res,
1660                 .rpc_cred = data->owner->so_cred,
1661         };
1662         struct rpc_task_setup task_setup_data = {
1663                 .rpc_client = server->client,
1664                 .rpc_message = &msg,
1665                 .callback_ops = &nfs4_open_ops,
1666                 .callback_data = data,
1667                 .workqueue = nfsiod_workqueue,
1668                 .flags = RPC_TASK_ASYNC,
1669         };
1670         int status;
1671
1672         nfs41_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1673         kref_get(&data->kref);
1674         data->rpc_done = 0;
1675         data->rpc_status = 0;
1676         data->cancelled = 0;
1677         data->is_recover = 0;
1678         if (isrecover) {
1679                 nfs4_set_sequence_privileged(&o_arg->seq_args);
1680                 data->is_recover = 1;
1681         }
1682         task = rpc_run_task(&task_setup_data);
1683         if (IS_ERR(task))
1684                 return PTR_ERR(task);
1685         status = nfs4_wait_for_completion_rpc_task(task);
1686         if (status != 0) {
1687                 data->cancelled = 1;
1688                 smp_wmb();
1689         } else
1690                 status = data->rpc_status;
1691         rpc_put_task(task);
1692
1693         return status;
1694 }
1695
1696 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1697 {
1698         struct inode *dir = data->dir->d_inode;
1699         struct nfs_openres *o_res = &data->o_res;
1700         int status;
1701
1702         status = nfs4_run_open_task(data, 1);
1703         if (status != 0 || !data->rpc_done)
1704                 return status;
1705
1706         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1707
1708         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1709                 status = _nfs4_proc_open_confirm(data);
1710                 if (status != 0)
1711                         return status;
1712         }
1713
1714         return status;
1715 }
1716
1717 static int nfs4_opendata_access(struct rpc_cred *cred,
1718                                 struct nfs4_opendata *opendata,
1719                                 struct nfs4_state *state, fmode_t fmode,
1720                                 int openflags)
1721 {
1722         struct nfs_access_entry cache;
1723         u32 mask;
1724
1725         /* access call failed or for some reason the server doesn't
1726          * support any access modes -- defer access call until later */
1727         if (opendata->o_res.access_supported == 0)
1728                 return 0;
1729
1730         mask = 0;
1731         /* don't check MAY_WRITE - a newly created file may not have
1732          * write mode bits, but POSIX allows the creating process to write.
1733          * use openflags to check for exec, because fmode won't
1734          * always have FMODE_EXEC set when file open for exec. */
1735         if (openflags & __FMODE_EXEC) {
1736                 /* ONLY check for exec rights */
1737                 mask = MAY_EXEC;
1738         } else if (fmode & FMODE_READ)
1739                 mask = MAY_READ;
1740
1741         cache.cred = cred;
1742         cache.jiffies = jiffies;
1743         nfs_access_set_mask(&cache, opendata->o_res.access_result);
1744         nfs_access_add_cache(state->inode, &cache);
1745
1746         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
1747                 return 0;
1748
1749         /* even though OPEN succeeded, access is denied. Close the file */
1750         nfs4_close_state(state, fmode);
1751         return -EACCES;
1752 }
1753
1754 /*
1755  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1756  */
1757 static int _nfs4_proc_open(struct nfs4_opendata *data)
1758 {
1759         struct inode *dir = data->dir->d_inode;
1760         struct nfs_server *server = NFS_SERVER(dir);
1761         struct nfs_openargs *o_arg = &data->o_arg;
1762         struct nfs_openres *o_res = &data->o_res;
1763         int status;
1764
1765         status = nfs4_run_open_task(data, 0);
1766         if (!data->rpc_done)
1767                 return status;
1768         if (status != 0) {
1769                 if (status == -NFS4ERR_BADNAME &&
1770                                 !(o_arg->open_flags & O_CREAT))
1771                         return -ENOENT;
1772                 return status;
1773         }
1774
1775         nfs_fattr_map_and_free_names(server, &data->f_attr);
1776
1777         if (o_arg->open_flags & O_CREAT)
1778                 update_changeattr(dir, &o_res->cinfo);
1779         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1780                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1781         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1782                 status = _nfs4_proc_open_confirm(data);
1783                 if (status != 0)
1784                         return status;
1785         }
1786         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1787                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1788         return 0;
1789 }
1790
1791 static int nfs4_recover_expired_lease(struct nfs_server *server)
1792 {
1793         return nfs4_client_recover_expired_lease(server->nfs_client);
1794 }
1795
1796 /*
1797  * OPEN_EXPIRED:
1798  *      reclaim state on the server after a network partition.
1799  *      Assumes caller holds the appropriate lock
1800  */
1801 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1802 {
1803         struct nfs4_opendata *opendata;
1804         int ret;
1805
1806         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1807                         NFS4_OPEN_CLAIM_FH);
1808         if (IS_ERR(opendata))
1809                 return PTR_ERR(opendata);
1810         ret = nfs4_open_recover(opendata, state);
1811         if (ret == -ESTALE)
1812                 d_drop(ctx->dentry);
1813         nfs4_opendata_put(opendata);
1814         return ret;
1815 }
1816
1817 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1818 {
1819         struct nfs_server *server = NFS_SERVER(state->inode);
1820         struct nfs4_exception exception = { };
1821         int err;
1822
1823         do {
1824                 err = _nfs4_open_expired(ctx, state);
1825                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1826                         continue;
1827                 switch (err) {
1828                 default:
1829                         goto out;
1830                 case -NFS4ERR_GRACE:
1831                 case -NFS4ERR_DELAY:
1832                         nfs4_handle_exception(server, err, &exception);
1833                         err = 0;
1834                 }
1835         } while (exception.retry);
1836 out:
1837         return err;
1838 }
1839
1840 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1841 {
1842         struct nfs_open_context *ctx;
1843         int ret;
1844
1845         ctx = nfs4_state_find_open_context(state);
1846         if (IS_ERR(ctx))
1847                 return -EAGAIN;
1848         ret = nfs4_do_open_expired(ctx, state);
1849         put_nfs_open_context(ctx);
1850         return ret;
1851 }
1852
1853 #if defined(CONFIG_NFS_V4_1)
1854 static void nfs41_clear_delegation_stateid(struct nfs4_state *state)
1855 {
1856         struct nfs_server *server = NFS_SERVER(state->inode);
1857         nfs4_stateid *stateid = &state->stateid;
1858         int status;
1859
1860         /* If a state reset has been done, test_stateid is unneeded */
1861         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1862                 return;
1863
1864         status = nfs41_test_stateid(server, stateid);
1865         if (status != NFS_OK) {
1866                 /* Free the stateid unless the server explicitly
1867                  * informs us the stateid is unrecognized. */
1868                 if (status != -NFS4ERR_BAD_STATEID)
1869                         nfs41_free_stateid(server, stateid);
1870                 nfs_remove_bad_delegation(state->inode);
1871
1872                 write_seqlock(&state->seqlock);
1873                 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1874                 write_sequnlock(&state->seqlock);
1875                 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1876         }
1877 }
1878
1879 /**
1880  * nfs41_check_open_stateid - possibly free an open stateid
1881  *
1882  * @state: NFSv4 state for an inode
1883  *
1884  * Returns NFS_OK if recovery for this stateid is now finished.
1885  * Otherwise a negative NFS4ERR value is returned.
1886  */
1887 static int nfs41_check_open_stateid(struct nfs4_state *state)
1888 {
1889         struct nfs_server *server = NFS_SERVER(state->inode);
1890         nfs4_stateid *stateid = &state->open_stateid;
1891         int status;
1892
1893         /* If a state reset has been done, test_stateid is unneeded */
1894         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
1895             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
1896             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
1897                 return -NFS4ERR_BAD_STATEID;
1898
1899         status = nfs41_test_stateid(server, stateid);
1900         if (status != NFS_OK) {
1901                 /* Free the stateid unless the server explicitly
1902                  * informs us the stateid is unrecognized. */
1903                 if (status != -NFS4ERR_BAD_STATEID)
1904                         nfs41_free_stateid(server, stateid);
1905
1906                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1907                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1908                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1909                 clear_bit(NFS_OPEN_STATE, &state->flags);
1910         }
1911         return status;
1912 }
1913
1914 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1915 {
1916         int status;
1917
1918         nfs41_clear_delegation_stateid(state);
1919         status = nfs41_check_open_stateid(state);
1920         if (status != NFS_OK)
1921                 status = nfs4_open_expired(sp, state);
1922         return status;
1923 }
1924 #endif
1925
1926 /*
1927  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1928  * fields corresponding to attributes that were used to store the verifier.
1929  * Make sure we clobber those fields in the later setattr call
1930  */
1931 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1932 {
1933         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1934             !(sattr->ia_valid & ATTR_ATIME_SET))
1935                 sattr->ia_valid |= ATTR_ATIME;
1936
1937         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1938             !(sattr->ia_valid & ATTR_MTIME_SET))
1939                 sattr->ia_valid |= ATTR_MTIME;
1940 }
1941
1942 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
1943                 fmode_t fmode,
1944                 int flags,
1945                 struct nfs4_state **res)
1946 {
1947         struct nfs4_state_owner *sp = opendata->owner;
1948         struct nfs_server *server = sp->so_server;
1949         struct nfs4_state *state;
1950         unsigned int seq;
1951         int ret;
1952
1953         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
1954
1955         ret = _nfs4_proc_open(opendata);
1956         if (ret != 0)
1957                 goto out;
1958
1959         state = nfs4_opendata_to_nfs4_state(opendata);
1960         ret = PTR_ERR(state);
1961         if (IS_ERR(state))
1962                 goto out;
1963         if (server->caps & NFS_CAP_POSIX_LOCK)
1964                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1965
1966         ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
1967         if (ret != 0)
1968                 goto out;
1969
1970         if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
1971                 nfs4_schedule_stateid_recovery(server, state);
1972         *res = state;
1973 out:
1974         return ret;
1975 }
1976
1977 /*
1978  * Returns a referenced nfs4_state
1979  */
1980 static int _nfs4_do_open(struct inode *dir,
1981                         struct dentry *dentry,
1982                         fmode_t fmode,
1983                         int flags,
1984                         struct iattr *sattr,
1985                         struct rpc_cred *cred,
1986                         struct nfs4_state **res,
1987                         struct nfs4_threshold **ctx_th)
1988 {
1989         struct nfs4_state_owner  *sp;
1990         struct nfs4_state     *state = NULL;
1991         struct nfs_server       *server = NFS_SERVER(dir);
1992         struct nfs4_opendata *opendata;
1993         enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
1994         int status;
1995
1996         /* Protect against reboot recovery conflicts */
1997         status = -ENOMEM;
1998         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
1999         if (sp == NULL) {
2000                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
2001                 goto out_err;
2002         }
2003         status = nfs4_recover_expired_lease(server);
2004         if (status != 0)
2005                 goto err_put_state_owner;
2006         if (dentry->d_inode != NULL)
2007                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
2008         status = -ENOMEM;
2009         if (dentry->d_inode)
2010                 claim = NFS4_OPEN_CLAIM_FH;
2011         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr,
2012                         claim, GFP_KERNEL);
2013         if (opendata == NULL)
2014                 goto err_put_state_owner;
2015
2016         if (ctx_th && server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
2017                 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
2018                 if (!opendata->f_attr.mdsthreshold)
2019                         goto err_opendata_put;
2020                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
2021         }
2022         if (dentry->d_inode != NULL)
2023                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
2024
2025         status = _nfs4_open_and_get_state(opendata, fmode, flags, &state);
2026         if (status != 0)
2027                 goto err_opendata_put;
2028
2029         if ((opendata->o_arg.open_flags & O_EXCL) &&
2030             (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
2031                 nfs4_exclusive_attrset(opendata, sattr);
2032
2033                 nfs_fattr_init(opendata->o_res.f_attr);
2034                 status = nfs4_do_setattr(state->inode, cred,
2035                                 opendata->o_res.f_attr, sattr,
2036                                 state);
2037                 if (status == 0)
2038                         nfs_setattr_update_inode(state->inode, sattr);
2039                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
2040         }
2041
2042         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server))
2043                 *ctx_th = opendata->f_attr.mdsthreshold;
2044         else
2045                 kfree(opendata->f_attr.mdsthreshold);
2046         opendata->f_attr.mdsthreshold = NULL;
2047
2048         nfs4_opendata_put(opendata);
2049         nfs4_put_state_owner(sp);
2050         *res = state;
2051         return 0;
2052 err_opendata_put:
2053         kfree(opendata->f_attr.mdsthreshold);
2054         nfs4_opendata_put(opendata);
2055 err_put_state_owner:
2056         nfs4_put_state_owner(sp);
2057 out_err:
2058         *res = NULL;
2059         return status;
2060 }
2061
2062
2063 static struct nfs4_state *nfs4_do_open(struct inode *dir,
2064                                         struct dentry *dentry,
2065                                         fmode_t fmode,
2066                                         int flags,
2067                                         struct iattr *sattr,
2068                                         struct rpc_cred *cred,
2069                                         struct nfs4_threshold **ctx_th)
2070 {
2071         struct nfs_server *server = NFS_SERVER(dir);
2072         struct nfs4_exception exception = { };
2073         struct nfs4_state *res;
2074         int status;
2075
2076         fmode &= FMODE_READ|FMODE_WRITE|FMODE_EXEC;
2077         do {
2078                 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred,
2079                                        &res, ctx_th);
2080                 if (status == 0)
2081                         break;
2082                 /* NOTE: BAD_SEQID means the server and client disagree about the
2083                  * book-keeping w.r.t. state-changing operations
2084                  * (OPEN/CLOSE/LOCK/LOCKU...)
2085                  * It is actually a sign of a bug on the client or on the server.
2086                  *
2087                  * If we receive a BAD_SEQID error in the particular case of
2088                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
2089                  * have unhashed the old state_owner for us, and that we can
2090                  * therefore safely retry using a new one. We should still warn
2091                  * the user though...
2092                  */
2093                 if (status == -NFS4ERR_BAD_SEQID) {
2094                         pr_warn_ratelimited("NFS: v4 server %s "
2095                                         " returned a bad sequence-id error!\n",
2096                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
2097                         exception.retry = 1;
2098                         continue;
2099                 }
2100                 /*
2101                  * BAD_STATEID on OPEN means that the server cancelled our
2102                  * state before it received the OPEN_CONFIRM.
2103                  * Recover by retrying the request as per the discussion
2104                  * on Page 181 of RFC3530.
2105                  */
2106                 if (status == -NFS4ERR_BAD_STATEID) {
2107                         exception.retry = 1;
2108                         continue;
2109                 }
2110                 if (status == -EAGAIN) {
2111                         /* We must have found a delegation */
2112                         exception.retry = 1;
2113                         continue;
2114                 }
2115                 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
2116                         continue;
2117                 res = ERR_PTR(nfs4_handle_exception(server,
2118                                         status, &exception));
2119         } while (exception.retry);
2120         return res;
2121 }
2122
2123 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2124                             struct nfs_fattr *fattr, struct iattr *sattr,
2125                             struct nfs4_state *state)
2126 {
2127         struct nfs_server *server = NFS_SERVER(inode);
2128         struct nfs_setattrargs  arg = {
2129                 .fh             = NFS_FH(inode),
2130                 .iap            = sattr,
2131                 .server         = server,
2132                 .bitmask = server->attr_bitmask,
2133         };
2134         struct nfs_setattrres  res = {
2135                 .fattr          = fattr,
2136                 .server         = server,
2137         };
2138         struct rpc_message msg = {
2139                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2140                 .rpc_argp       = &arg,
2141                 .rpc_resp       = &res,
2142                 .rpc_cred       = cred,
2143         };
2144         unsigned long timestamp = jiffies;
2145         fmode_t fmode;
2146         bool truncate;
2147         int status;
2148
2149         nfs_fattr_init(fattr);
2150
2151         /* Servers should only apply open mode checks for file size changes */
2152         truncate = (sattr->ia_valid & ATTR_SIZE) ? true : false;
2153         fmode = truncate ? FMODE_WRITE : FMODE_READ;
2154
2155         if (nfs4_copy_delegation_stateid(&arg.stateid, inode, fmode)) {
2156                 /* Use that stateid */
2157         } else if (truncate && state != NULL && nfs4_valid_open_stateid(state)) {
2158                 struct nfs_lockowner lockowner = {
2159                         .l_owner = current->files,
2160                         .l_pid = current->tgid,
2161                 };
2162                 nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2163                                 &lockowner);
2164         } else
2165                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2166
2167         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2168         if (status == 0 && state != NULL)
2169                 renew_lease(server, timestamp);
2170         return status;
2171 }
2172
2173 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2174                            struct nfs_fattr *fattr, struct iattr *sattr,
2175                            struct nfs4_state *state)
2176 {
2177         struct nfs_server *server = NFS_SERVER(inode);
2178         struct nfs4_exception exception = {
2179                 .state = state,
2180                 .inode = inode,
2181         };
2182         int err;
2183         do {
2184                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state);
2185                 switch (err) {
2186                 case -NFS4ERR_OPENMODE:
2187                         if (!(sattr->ia_valid & ATTR_SIZE)) {
2188                                 pr_warn_once("NFSv4: server %s is incorrectly "
2189                                                 "applying open mode checks to "
2190                                                 "a SETATTR that is not "
2191                                                 "changing file size.\n",
2192                                                 server->nfs_client->cl_hostname);
2193                         }
2194                         if (state && !(state->state & FMODE_WRITE)) {
2195                                 err = -EBADF;
2196                                 if (sattr->ia_valid & ATTR_OPEN)
2197                                         err = -EACCES;
2198                                 goto out;
2199                         }
2200                 }
2201                 err = nfs4_handle_exception(server, err, &exception);
2202         } while (exception.retry);
2203 out:
2204         return err;
2205 }
2206
2207 struct nfs4_closedata {
2208         struct inode *inode;
2209         struct nfs4_state *state;
2210         struct nfs_closeargs arg;
2211         struct nfs_closeres res;
2212         struct nfs_fattr fattr;
2213         unsigned long timestamp;
2214         bool roc;
2215         u32 roc_barrier;
2216 };
2217
2218 static void nfs4_free_closedata(void *data)
2219 {
2220         struct nfs4_closedata *calldata = data;
2221         struct nfs4_state_owner *sp = calldata->state->owner;
2222         struct super_block *sb = calldata->state->inode->i_sb;
2223
2224         if (calldata->roc)
2225                 pnfs_roc_release(calldata->state->inode);
2226         nfs4_put_open_state(calldata->state);
2227         nfs_free_seqid(calldata->arg.seqid);
2228         nfs4_put_state_owner(sp);
2229         nfs_sb_deactive(sb);
2230         kfree(calldata);
2231 }
2232
2233 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
2234                 fmode_t fmode)
2235 {
2236         spin_lock(&state->owner->so_lock);
2237         clear_bit(NFS_O_RDWR_STATE, &state->flags);
2238         switch (fmode & (FMODE_READ|FMODE_WRITE)) {
2239         case FMODE_WRITE:
2240                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2241                 break;
2242         case FMODE_READ:
2243                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2244                 break;
2245         case 0:
2246                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2247                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2248                 clear_bit(NFS_OPEN_STATE, &state->flags);
2249         }
2250         spin_unlock(&state->owner->so_lock);
2251 }
2252
2253 static void nfs4_close_done(struct rpc_task *task, void *data)
2254 {
2255         struct nfs4_closedata *calldata = data;
2256         struct nfs4_state *state = calldata->state;
2257         struct nfs_server *server = NFS_SERVER(calldata->inode);
2258
2259         dprintk("%s: begin!\n", __func__);
2260         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2261                 return;
2262         /* hmm. we are done with the inode, and in the process of freeing
2263          * the state_owner. we keep this around to process errors
2264          */
2265         switch (task->tk_status) {
2266                 case 0:
2267                         if (calldata->roc)
2268                                 pnfs_roc_set_barrier(state->inode,
2269                                                      calldata->roc_barrier);
2270                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
2271                         renew_lease(server, calldata->timestamp);
2272                         nfs4_close_clear_stateid_flags(state,
2273                                         calldata->arg.fmode);
2274                         break;
2275                 case -NFS4ERR_STALE_STATEID:
2276                 case -NFS4ERR_OLD_STATEID:
2277                 case -NFS4ERR_BAD_STATEID:
2278                 case -NFS4ERR_EXPIRED:
2279                         if (calldata->arg.fmode == 0)
2280                                 break;
2281                 default:
2282                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
2283                                 rpc_restart_call_prepare(task);
2284         }
2285         nfs_release_seqid(calldata->arg.seqid);
2286         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2287         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2288 }
2289
2290 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2291 {
2292         struct nfs4_closedata *calldata = data;
2293         struct nfs4_state *state = calldata->state;
2294         struct inode *inode = calldata->inode;
2295         int call_close = 0;
2296
2297         dprintk("%s: begin!\n", __func__);
2298         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2299                 goto out_wait;
2300
2301         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2302         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2303         spin_lock(&state->owner->so_lock);
2304         /* Calculate the change in open mode */
2305         if (state->n_rdwr == 0) {
2306                 if (state->n_rdonly == 0) {
2307                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2308                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2309                         calldata->arg.fmode &= ~FMODE_READ;
2310                 }
2311                 if (state->n_wronly == 0) {
2312                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2313                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2314                         calldata->arg.fmode &= ~FMODE_WRITE;
2315                 }
2316         }
2317         if (!nfs4_valid_open_stateid(state))
2318                 call_close = 0;
2319         spin_unlock(&state->owner->so_lock);
2320
2321         if (!call_close) {
2322                 /* Note: exit _without_ calling nfs4_close_done */
2323                 goto out_no_action;
2324         }
2325
2326         if (calldata->arg.fmode == 0) {
2327                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2328                 if (calldata->roc &&
2329                     pnfs_roc_drain(inode, &calldata->roc_barrier, task)) {
2330                         nfs_release_seqid(calldata->arg.seqid);
2331                         goto out_wait;
2332                     }
2333         }
2334
2335         nfs_fattr_init(calldata->res.fattr);
2336         calldata->timestamp = jiffies;
2337         if (nfs4_setup_sequence(NFS_SERVER(inode),
2338                                 &calldata->arg.seq_args,
2339                                 &calldata->res.seq_res,
2340                                 task) != 0)
2341                 nfs_release_seqid(calldata->arg.seqid);
2342         dprintk("%s: done!\n", __func__);
2343         return;
2344 out_no_action:
2345         task->tk_action = NULL;
2346 out_wait:
2347         nfs4_sequence_done(task, &calldata->res.seq_res);
2348 }
2349
2350 static const struct rpc_call_ops nfs4_close_ops = {
2351         .rpc_call_prepare = nfs4_close_prepare,
2352         .rpc_call_done = nfs4_close_done,
2353         .rpc_release = nfs4_free_closedata,
2354 };
2355
2356 /* 
2357  * It is possible for data to be read/written from a mem-mapped file 
2358  * after the sys_close call (which hits the vfs layer as a flush).
2359  * This means that we can't safely call nfsv4 close on a file until 
2360  * the inode is cleared. This in turn means that we are not good
2361  * NFSv4 citizens - we do not indicate to the server to update the file's 
2362  * share state even when we are done with one of the three share 
2363  * stateid's in the inode.
2364  *
2365  * NOTE: Caller must be holding the sp->so_owner semaphore!
2366  */
2367 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2368 {
2369         struct nfs_server *server = NFS_SERVER(state->inode);
2370         struct nfs4_closedata *calldata;
2371         struct nfs4_state_owner *sp = state->owner;
2372         struct rpc_task *task;
2373         struct rpc_message msg = {
2374                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2375                 .rpc_cred = state->owner->so_cred,
2376         };
2377         struct rpc_task_setup task_setup_data = {
2378                 .rpc_client = server->client,
2379                 .rpc_message = &msg,
2380                 .callback_ops = &nfs4_close_ops,
2381                 .workqueue = nfsiod_workqueue,
2382                 .flags = RPC_TASK_ASYNC,
2383         };
2384         int status = -ENOMEM;
2385
2386         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2387         if (calldata == NULL)
2388                 goto out;
2389         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2390         calldata->inode = state->inode;
2391         calldata->state = state;
2392         calldata->arg.fh = NFS_FH(state->inode);
2393         calldata->arg.stateid = &state->open_stateid;
2394         /* Serialization for the sequence id */
2395         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2396         if (calldata->arg.seqid == NULL)
2397                 goto out_free_calldata;
2398         calldata->arg.fmode = 0;
2399         calldata->arg.bitmask = server->cache_consistency_bitmask;
2400         calldata->res.fattr = &calldata->fattr;
2401         calldata->res.seqid = calldata->arg.seqid;
2402         calldata->res.server = server;
2403         calldata->roc = pnfs_roc(state->inode);
2404         nfs_sb_active(calldata->inode->i_sb);
2405
2406         msg.rpc_argp = &calldata->arg;
2407         msg.rpc_resp = &calldata->res;
2408         task_setup_data.callback_data = calldata;
2409         task = rpc_run_task(&task_setup_data);
2410         if (IS_ERR(task))
2411                 return PTR_ERR(task);
2412         status = 0;
2413         if (wait)
2414                 status = rpc_wait_for_completion_task(task);
2415         rpc_put_task(task);
2416         return status;
2417 out_free_calldata:
2418         kfree(calldata);
2419 out:
2420         nfs4_put_open_state(state);
2421         nfs4_put_state_owner(sp);
2422         return status;
2423 }
2424
2425 static struct inode *
2426 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2427 {
2428         struct nfs4_state *state;
2429
2430         /* Protect against concurrent sillydeletes */
2431         state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr,
2432                              ctx->cred, &ctx->mdsthreshold);
2433         if (IS_ERR(state))
2434                 return ERR_CAST(state);
2435         ctx->state = state;
2436         return igrab(state->inode);
2437 }
2438
2439 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2440 {
2441         if (ctx->state == NULL)
2442                 return;
2443         if (is_sync)
2444                 nfs4_close_sync(ctx->state, ctx->mode);
2445         else
2446                 nfs4_close_state(ctx->state, ctx->mode);
2447 }
2448
2449 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2450 {
2451         struct nfs4_server_caps_arg args = {
2452                 .fhandle = fhandle,
2453         };
2454         struct nfs4_server_caps_res res = {};
2455         struct rpc_message msg = {
2456                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2457                 .rpc_argp = &args,
2458                 .rpc_resp = &res,
2459         };
2460         int status;
2461
2462         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2463         if (status == 0) {
2464                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2465                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2466                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2467                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2468                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2469                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2470                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2471                         server->caps |= NFS_CAP_ACLS;
2472                 if (res.has_links != 0)
2473                         server->caps |= NFS_CAP_HARDLINKS;
2474                 if (res.has_symlinks != 0)
2475                         server->caps |= NFS_CAP_SYMLINKS;
2476                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2477                         server->caps |= NFS_CAP_FILEID;
2478                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2479                         server->caps |= NFS_CAP_MODE;
2480                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2481                         server->caps |= NFS_CAP_NLINK;
2482                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2483                         server->caps |= NFS_CAP_OWNER;
2484                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2485                         server->caps |= NFS_CAP_OWNER_GROUP;
2486                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2487                         server->caps |= NFS_CAP_ATIME;
2488                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2489                         server->caps |= NFS_CAP_CTIME;
2490                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2491                         server->caps |= NFS_CAP_MTIME;
2492
2493                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2494                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2495                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2496                 server->acl_bitmask = res.acl_bitmask;
2497                 server->fh_expire_type = res.fh_expire_type;
2498         }
2499
2500         return status;
2501 }
2502
2503 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2504 {
2505         struct nfs4_exception exception = { };
2506         int err;
2507         do {
2508                 err = nfs4_handle_exception(server,
2509                                 _nfs4_server_capabilities(server, fhandle),
2510                                 &exception);
2511         } while (exception.retry);
2512         return err;
2513 }
2514
2515 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2516                 struct nfs_fsinfo *info)
2517 {
2518         struct nfs4_lookup_root_arg args = {
2519                 .bitmask = nfs4_fattr_bitmap,
2520         };
2521         struct nfs4_lookup_res res = {
2522                 .server = server,
2523                 .fattr = info->fattr,
2524                 .fh = fhandle,
2525         };
2526         struct rpc_message msg = {
2527                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2528                 .rpc_argp = &args,
2529                 .rpc_resp = &res,
2530         };
2531
2532         nfs_fattr_init(info->fattr);
2533         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2534 }
2535
2536 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2537                 struct nfs_fsinfo *info)
2538 {
2539         struct nfs4_exception exception = { };
2540         int err;
2541         do {
2542                 err = _nfs4_lookup_root(server, fhandle, info);
2543                 switch (err) {
2544                 case 0:
2545                 case -NFS4ERR_WRONGSEC:
2546                         goto out;
2547                 default:
2548                         err = nfs4_handle_exception(server, err, &exception);
2549                 }
2550         } while (exception.retry);
2551 out:
2552         return err;
2553 }
2554
2555 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2556                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2557 {
2558         struct rpc_auth *auth;
2559         int ret;
2560
2561         auth = rpcauth_create(flavor, server->client);
2562         if (IS_ERR(auth)) {
2563                 ret = -EACCES;
2564                 goto out;
2565         }
2566         ret = nfs4_lookup_root(server, fhandle, info);
2567 out:
2568         return ret;
2569 }
2570
2571 /*
2572  * Retry pseudoroot lookup with various security flavors.  We do this when:
2573  *
2574  *   NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
2575  *   NFSv4.1: the server does not support the SECINFO_NO_NAME operation
2576  *
2577  * Returns zero on success, or a negative NFS4ERR value, or a
2578  * negative errno value.
2579  */
2580 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2581                               struct nfs_fsinfo *info)
2582 {
2583         /* Per 3530bis 15.33.5 */
2584         static const rpc_authflavor_t flav_array[] = {
2585                 RPC_AUTH_GSS_KRB5P,
2586                 RPC_AUTH_GSS_KRB5I,
2587                 RPC_AUTH_GSS_KRB5,
2588                 RPC_AUTH_UNIX,                  /* courtesy */
2589                 RPC_AUTH_NULL,
2590         };
2591         int status = -EPERM;
2592         size_t i;
2593
2594         for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
2595                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2596                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2597                         continue;
2598                 break;
2599         }
2600
2601         /*
2602          * -EACCESS could mean that the user doesn't have correct permissions
2603          * to access the mount.  It could also mean that we tried to mount
2604          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2605          * existing mount programs don't handle -EACCES very well so it should
2606          * be mapped to -EPERM instead.
2607          */
2608         if (status == -EACCES)
2609                 status = -EPERM;
2610         return status;
2611 }
2612
2613 static int nfs4_do_find_root_sec(struct nfs_server *server,
2614                 struct nfs_fh *fhandle, struct nfs_fsinfo *info)
2615 {
2616         int mv = server->nfs_client->cl_minorversion;
2617         return nfs_v4_minor_ops[mv]->find_root_sec(server, fhandle, info);
2618 }
2619
2620 /**
2621  * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
2622  * @server: initialized nfs_server handle
2623  * @fhandle: we fill in the pseudo-fs root file handle
2624  * @info: we fill in an FSINFO struct
2625  *
2626  * Returns zero on success, or a negative errno.
2627  */
2628 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
2629                          struct nfs_fsinfo *info)
2630 {
2631         int status;
2632
2633         status = nfs4_lookup_root(server, fhandle, info);
2634         if ((status == -NFS4ERR_WRONGSEC) &&
2635             !(server->flags & NFS_MOUNT_SECFLAVOUR))
2636                 status = nfs4_do_find_root_sec(server, fhandle, info);
2637
2638         if (status == 0)
2639                 status = nfs4_server_capabilities(server, fhandle);
2640         if (status == 0)
2641                 status = nfs4_do_fsinfo(server, fhandle, info);
2642
2643         return nfs4_map_errors(status);
2644 }
2645
2646 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
2647                               struct nfs_fsinfo *info)
2648 {
2649         int error;
2650         struct nfs_fattr *fattr = info->fattr;
2651
2652         error = nfs4_server_capabilities(server, mntfh);
2653         if (error < 0) {
2654                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
2655                 return error;
2656         }
2657
2658         error = nfs4_proc_getattr(server, mntfh, fattr);
2659         if (error < 0) {
2660                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
2661                 return error;
2662         }
2663
2664         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
2665             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
2666                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
2667
2668         return error;
2669 }
2670
2671 /*
2672  * Get locations and (maybe) other attributes of a referral.
2673  * Note that we'll actually follow the referral later when
2674  * we detect fsid mismatch in inode revalidation
2675  */
2676 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
2677                              const struct qstr *name, struct nfs_fattr *fattr,
2678                              struct nfs_fh *fhandle)
2679 {
2680         int status = -ENOMEM;
2681         struct page *page = NULL;
2682         struct nfs4_fs_locations *locations = NULL;
2683
2684         page = alloc_page(GFP_KERNEL);
2685         if (page == NULL)
2686                 goto out;
2687         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2688         if (locations == NULL)
2689                 goto out;
2690
2691         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
2692         if (status != 0)
2693                 goto out;
2694         /* Make sure server returned a different fsid for the referral */
2695         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2696                 dprintk("%s: server did not return a different fsid for"
2697                         " a referral at %s\n", __func__, name->name);
2698                 status = -EIO;
2699                 goto out;
2700         }
2701         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2702         nfs_fixup_referral_attributes(&locations->fattr);
2703
2704         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2705         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2706         memset(fhandle, 0, sizeof(struct nfs_fh));
2707 out:
2708         if (page)
2709                 __free_page(page);
2710         kfree(locations);
2711         return status;
2712 }
2713
2714 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2715 {
2716         struct nfs4_getattr_arg args = {
2717                 .fh = fhandle,
2718                 .bitmask = server->attr_bitmask,
2719         };
2720         struct nfs4_getattr_res res = {
2721                 .fattr = fattr,
2722                 .server = server,
2723         };
2724         struct rpc_message msg = {
2725                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2726                 .rpc_argp = &args,
2727                 .rpc_resp = &res,
2728         };
2729         
2730         nfs_fattr_init(fattr);
2731         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2732 }
2733
2734 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2735 {
2736         struct nfs4_exception exception = { };
2737         int err;
2738         do {
2739                 err = nfs4_handle_exception(server,
2740                                 _nfs4_proc_getattr(server, fhandle, fattr),
2741                                 &exception);
2742         } while (exception.retry);
2743         return err;
2744 }
2745
2746 /* 
2747  * The file is not closed if it is opened due to the a request to change
2748  * the size of the file. The open call will not be needed once the
2749  * VFS layer lookup-intents are implemented.
2750  *
2751  * Close is called when the inode is destroyed.
2752  * If we haven't opened the file for O_WRONLY, we
2753  * need to in the size_change case to obtain a stateid.
2754  *
2755  * Got race?
2756  * Because OPEN is always done by name in nfsv4, it is
2757  * possible that we opened a different file by the same
2758  * name.  We can recognize this race condition, but we
2759  * can't do anything about it besides returning an error.
2760  *
2761  * This will be fixed with VFS changes (lookup-intent).
2762  */
2763 static int
2764 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2765                   struct iattr *sattr)
2766 {
2767         struct inode *inode = dentry->d_inode;
2768         struct rpc_cred *cred = NULL;
2769         struct nfs4_state *state = NULL;
2770         int status;
2771
2772         if (pnfs_ld_layoutret_on_setattr(inode))
2773                 pnfs_commit_and_return_layout(inode);
2774
2775         nfs_fattr_init(fattr);
2776         
2777         /* Deal with open(O_TRUNC) */
2778         if (sattr->ia_valid & ATTR_OPEN)
2779                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME|ATTR_OPEN);
2780
2781         /* Optimization: if the end result is no change, don't RPC */
2782         if ((sattr->ia_valid & ~(ATTR_FILE)) == 0)
2783                 return 0;
2784
2785         /* Search for an existing open(O_WRITE) file */
2786         if (sattr->ia_valid & ATTR_FILE) {
2787                 struct nfs_open_context *ctx;
2788
2789                 ctx = nfs_file_open_context(sattr->ia_file);
2790                 if (ctx) {
2791                         cred = ctx->cred;
2792                         state = ctx->state;
2793                 }
2794         }
2795
2796         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2797         if (status == 0)
2798                 nfs_setattr_update_inode(inode, sattr);
2799         return status;
2800 }
2801
2802 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2803                 const struct qstr *name, struct nfs_fh *fhandle,
2804                 struct nfs_fattr *fattr)
2805 {
2806         struct nfs_server *server = NFS_SERVER(dir);
2807         int                    status;
2808         struct nfs4_lookup_arg args = {
2809                 .bitmask = server->attr_bitmask,
2810                 .dir_fh = NFS_FH(dir),
2811                 .name = name,
2812         };
2813         struct nfs4_lookup_res res = {
2814                 .server = server,
2815                 .fattr = fattr,
2816                 .fh = fhandle,
2817         };
2818         struct rpc_message msg = {
2819                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2820                 .rpc_argp = &args,
2821                 .rpc_resp = &res,
2822         };
2823
2824         nfs_fattr_init(fattr);
2825
2826         dprintk("NFS call  lookup %s\n", name->name);
2827         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2828         dprintk("NFS reply lookup: %d\n", status);
2829         return status;
2830 }
2831
2832 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
2833 {
2834         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2835                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
2836         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2837         fattr->nlink = 2;
2838 }
2839
2840 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
2841                                    struct qstr *name, struct nfs_fh *fhandle,
2842                                    struct nfs_fattr *fattr)
2843 {
2844         struct nfs4_exception exception = { };
2845         struct rpc_clnt *client = *clnt;
2846         int err;
2847         do {
2848                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr);
2849                 switch (err) {
2850                 case -NFS4ERR_BADNAME:
2851                         err = -ENOENT;
2852                         goto out;
2853                 case -NFS4ERR_MOVED:
2854                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
2855                         goto out;
2856                 case -NFS4ERR_WRONGSEC:
2857                         err = -EPERM;
2858                         if (client != *clnt)
2859                                 goto out;
2860
2861                         client = nfs4_create_sec_client(client, dir, name);
2862                         if (IS_ERR(client))
2863                                 return PTR_ERR(client);
2864
2865                         exception.retry = 1;
2866                         break;
2867                 default:
2868                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
2869                 }
2870         } while (exception.retry);
2871
2872 out:
2873         if (err == 0)
2874                 *clnt = client;
2875         else if (client != *clnt)
2876                 rpc_shutdown_client(client);
2877
2878         return err;
2879 }
2880
2881 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
2882                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2883 {
2884         int status;
2885         struct rpc_clnt *client = NFS_CLIENT(dir);
2886
2887         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2888         if (client != NFS_CLIENT(dir)) {
2889                 rpc_shutdown_client(client);
2890                 nfs_fixup_secinfo_attributes(fattr);
2891         }
2892         return status;
2893 }
2894
2895 struct rpc_clnt *
2896 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
2897                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2898 {
2899         int status;
2900         struct rpc_clnt *client = rpc_clone_client(NFS_CLIENT(dir));
2901
2902         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2903         if (status < 0) {
2904                 rpc_shutdown_client(client);
2905                 return ERR_PTR(status);
2906         }
2907         return client;
2908 }
2909
2910 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2911 {
2912         struct nfs_server *server = NFS_SERVER(inode);
2913         struct nfs4_accessargs args = {
2914                 .fh = NFS_FH(inode),
2915                 .bitmask = server->cache_consistency_bitmask,
2916         };
2917         struct nfs4_accessres res = {
2918                 .server = server,
2919         };
2920         struct rpc_message msg = {
2921                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2922                 .rpc_argp = &args,
2923                 .rpc_resp = &res,
2924                 .rpc_cred = entry->cred,
2925         };
2926         int mode = entry->mask;
2927         int status;
2928
2929         /*
2930          * Determine which access bits we want to ask for...
2931          */
2932         if (mode & MAY_READ)
2933                 args.access |= NFS4_ACCESS_READ;
2934         if (S_ISDIR(inode->i_mode)) {
2935                 if (mode & MAY_WRITE)
2936                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2937                 if (mode & MAY_EXEC)
2938                         args.access |= NFS4_ACCESS_LOOKUP;
2939         } else {
2940                 if (mode & MAY_WRITE)
2941                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2942                 if (mode & MAY_EXEC)
2943                         args.access |= NFS4_ACCESS_EXECUTE;
2944         }
2945
2946         res.fattr = nfs_alloc_fattr();
2947         if (res.fattr == NULL)
2948                 return -ENOMEM;
2949
2950         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2951         if (!status) {
2952                 nfs_access_set_mask(entry, res.access);
2953                 nfs_refresh_inode(inode, res.fattr);
2954         }
2955         nfs_free_fattr(res.fattr);
2956         return status;
2957 }
2958
2959 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2960 {
2961         struct nfs4_exception exception = { };
2962         int err;
2963         do {
2964                 err = nfs4_handle_exception(NFS_SERVER(inode),
2965                                 _nfs4_proc_access(inode, entry),
2966                                 &exception);
2967         } while (exception.retry);
2968         return err;
2969 }
2970
2971 /*
2972  * TODO: For the time being, we don't try to get any attributes
2973  * along with any of the zero-copy operations READ, READDIR,
2974  * READLINK, WRITE.
2975  *
2976  * In the case of the first three, we want to put the GETATTR
2977  * after the read-type operation -- this is because it is hard
2978  * to predict the length of a GETATTR response in v4, and thus
2979  * align the READ data correctly.  This means that the GETATTR
2980  * may end up partially falling into the page cache, and we should
2981  * shift it into the 'tail' of the xdr_buf before processing.
2982  * To do this efficiently, we need to know the total length
2983  * of data received, which doesn't seem to be available outside
2984  * of the RPC layer.
2985  *
2986  * In the case of WRITE, we also want to put the GETATTR after
2987  * the operation -- in this case because we want to make sure
2988  * we get the post-operation mtime and size.
2989  *
2990  * Both of these changes to the XDR layer would in fact be quite
2991  * minor, but I decided to leave them for a subsequent patch.
2992  */
2993 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2994                 unsigned int pgbase, unsigned int pglen)
2995 {
2996         struct nfs4_readlink args = {
2997                 .fh       = NFS_FH(inode),
2998                 .pgbase   = pgbase,
2999                 .pglen    = pglen,
3000                 .pages    = &page,
3001         };
3002         struct nfs4_readlink_res res;
3003         struct rpc_message msg = {
3004                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
3005                 .rpc_argp = &args,
3006                 .rpc_resp = &res,
3007         };
3008
3009         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3010 }
3011
3012 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
3013                 unsigned int pgbase, unsigned int pglen)
3014 {
3015         struct nfs4_exception exception = { };
3016         int err;
3017         do {
3018                 err = nfs4_handle_exception(NFS_SERVER(inode),
3019                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
3020                                 &exception);
3021         } while (exception.retry);
3022         return err;
3023 }
3024
3025 /*
3026  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
3027  */
3028 static int
3029 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
3030                  int flags)
3031 {
3032         struct nfs_open_context *ctx;
3033         struct nfs4_state *state;
3034         int status = 0;
3035
3036         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
3037         if (IS_ERR(ctx))
3038                 return PTR_ERR(ctx);
3039
3040         sattr->ia_mode &= ~current_umask();
3041         state = nfs4_do_open(dir, dentry, ctx->mode,
3042                         flags, sattr, ctx->cred,
3043                         &ctx->mdsthreshold);
3044         d_drop(dentry);
3045         if (IS_ERR(state)) {
3046                 status = PTR_ERR(state);
3047                 goto out;
3048         }
3049         d_add(dentry, igrab(state->inode));
3050         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
3051         ctx->state = state;
3052 out:
3053         put_nfs_open_context(ctx);
3054         return status;
3055 }
3056
3057 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
3058 {
3059         struct nfs_server *server = NFS_SERVER(dir);
3060         struct nfs_removeargs args = {
3061                 .fh = NFS_FH(dir),
3062                 .name = *name,
3063         };
3064         struct nfs_removeres res = {
3065                 .server = server,
3066         };
3067         struct rpc_message msg = {
3068                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
3069                 .rpc_argp = &args,
3070                 .rpc_resp = &res,
3071         };
3072         int status;
3073
3074         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
3075         if (status == 0)
3076                 update_changeattr(dir, &res.cinfo);
3077         return status;
3078 }
3079
3080 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
3081 {
3082         struct nfs4_exception exception = { };
3083         int err;
3084         do {
3085                 err = nfs4_handle_exception(NFS_SERVER(dir),
3086                                 _nfs4_proc_remove(dir, name),
3087                                 &exception);
3088         } while (exception.retry);
3089         return err;
3090 }
3091
3092 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
3093 {
3094         struct nfs_server *server = NFS_SERVER(dir);
3095         struct nfs_removeargs *args = msg->rpc_argp;
3096         struct nfs_removeres *res = msg->rpc_resp;
3097
3098         res->server = server;
3099         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
3100         nfs41_init_sequence(&args->seq_args, &res->seq_res, 1);
3101 }
3102
3103 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
3104 {
3105         nfs4_setup_sequence(NFS_SERVER(data->dir),
3106                         &data->args.seq_args,
3107                         &data->res.seq_res,
3108                         task);
3109 }
3110
3111 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
3112 {
3113         struct nfs_removeres *res = task->tk_msg.rpc_resp;
3114
3115         if (!nfs4_sequence_done(task, &res->seq_res))
3116                 return 0;
3117         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3118                 return 0;
3119         update_changeattr(dir, &res->cinfo);
3120         return 1;
3121 }
3122
3123 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
3124 {
3125         struct nfs_server *server = NFS_SERVER(dir);
3126         struct nfs_renameargs *arg = msg->rpc_argp;
3127         struct nfs_renameres *res = msg->rpc_resp;
3128
3129         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
3130         res->server = server;
3131         nfs41_init_sequence(&arg->seq_args, &res->seq_res, 1);
3132 }
3133
3134 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3135 {
3136         nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3137                         &data->args.seq_args,
3138                         &data->res.seq_res,
3139                         task);
3140 }
3141
3142 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3143                                  struct inode *new_dir)
3144 {
3145         struct nfs_renameres *res = task->tk_msg.rpc_resp;
3146
3147         if (!nfs4_sequence_done(task, &res->seq_res))
3148                 return 0;
3149         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3150                 return 0;
3151
3152         update_changeattr(old_dir, &res->old_cinfo);
3153         update_changeattr(new_dir, &res->new_cinfo);
3154         return 1;
3155 }
3156
3157 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3158                 struct inode *new_dir, struct qstr *new_name)
3159 {
3160         struct nfs_server *server = NFS_SERVER(old_dir);
3161         struct nfs_renameargs arg = {
3162                 .old_dir = NFS_FH(old_dir),
3163                 .new_dir = NFS_FH(new_dir),
3164                 .old_name = old_name,
3165                 .new_name = new_name,
3166         };
3167         struct nfs_renameres res = {
3168                 .server = server,
3169         };
3170         struct rpc_message msg = {
3171                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
3172                 .rpc_argp = &arg,
3173                 .rpc_resp = &res,
3174         };
3175         int status = -ENOMEM;
3176         
3177         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3178         if (!status) {
3179                 update_changeattr(old_dir, &res.old_cinfo);
3180                 update_changeattr(new_dir, &res.new_cinfo);
3181         }
3182         return status;
3183 }
3184
3185 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3186                 struct inode *new_dir, struct qstr *new_name)
3187 {
3188         struct nfs4_exception exception = { };
3189         int err;
3190         do {
3191                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
3192                                 _nfs4_proc_rename(old_dir, old_name,
3193                                         new_dir, new_name),
3194                                 &exception);
3195         } while (exception.retry);
3196         return err;
3197 }
3198
3199 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3200 {
3201         struct nfs_server *server = NFS_SERVER(inode);
3202         struct nfs4_link_arg arg = {
3203                 .fh     = NFS_FH(inode),
3204                 .dir_fh = NFS_FH(dir),
3205                 .name   = name,
3206                 .bitmask = server->attr_bitmask,
3207         };
3208         struct nfs4_link_res res = {
3209                 .server = server,
3210         };
3211         struct rpc_message msg = {
3212                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3213                 .rpc_argp = &arg,
3214                 .rpc_resp = &res,
3215         };
3216         int status = -ENOMEM;
3217
3218         res.fattr = nfs_alloc_fattr();
3219         if (res.fattr == NULL)
3220                 goto out;
3221
3222         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3223         if (!status) {
3224                 update_changeattr(dir, &res.cinfo);
3225                 nfs_post_op_update_inode(inode, res.fattr);
3226         }
3227 out:
3228         nfs_free_fattr(res.fattr);
3229         return status;
3230 }
3231
3232 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3233 {
3234         struct nfs4_exception exception = { };
3235         int err;
3236         do {
3237                 err = nfs4_handle_exception(NFS_SERVER(inode),
3238                                 _nfs4_proc_link(inode, dir, name),
3239                                 &exception);
3240         } while (exception.retry);
3241         return err;
3242 }
3243
3244 struct nfs4_createdata {
3245         struct rpc_message msg;
3246         struct nfs4_create_arg arg;
3247         struct nfs4_create_res res;
3248         struct nfs_fh fh;
3249         struct nfs_fattr fattr;
3250 };
3251
3252 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3253                 struct qstr *name, struct iattr *sattr, u32 ftype)
3254 {
3255         struct nfs4_createdata *data;
3256
3257         data = kzalloc(sizeof(*data), GFP_KERNEL);
3258         if (data != NULL) {
3259                 struct nfs_server *server = NFS_SERVER(dir);
3260
3261                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3262                 data->msg.rpc_argp = &data->arg;
3263                 data->msg.rpc_resp = &data->res;
3264                 data->arg.dir_fh = NFS_FH(dir);
3265                 data->arg.server = server;
3266                 data->arg.name = name;
3267                 data->arg.attrs = sattr;
3268                 data->arg.ftype = ftype;
3269                 data->arg.bitmask = server->attr_bitmask;
3270                 data->res.server = server;
3271                 data->res.fh = &data->fh;
3272                 data->res.fattr = &data->fattr;
3273                 nfs_fattr_init(data->res.fattr);
3274         }
3275         return data;
3276 }
3277
3278 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3279 {
3280         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3281                                     &data->arg.seq_args, &data->res.seq_res, 1);
3282         if (status == 0) {
3283                 update_changeattr(dir, &data->res.dir_cinfo);
3284                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
3285         }
3286         return status;
3287 }
3288
3289 static void nfs4_free_createdata(struct nfs4_createdata *data)
3290 {
3291         kfree(data);
3292 }
3293
3294 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3295                 struct page *page, unsigned int len, struct iattr *sattr)
3296 {
3297         struct nfs4_createdata *data;
3298         int status = -ENAMETOOLONG;
3299
3300         if (len > NFS4_MAXPATHLEN)
3301                 goto out;
3302
3303         status = -ENOMEM;
3304         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3305         if (data == NULL)
3306                 goto out;
3307
3308         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3309         data->arg.u.symlink.pages = &page;
3310         data->arg.u.symlink.len = len;
3311         
3312         status = nfs4_do_create(dir, dentry, data);
3313
3314         nfs4_free_createdata(data);
3315 out:
3316         return status;
3317 }
3318
3319 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3320                 struct page *page, unsigned int len, struct iattr *sattr)
3321 {
3322         struct nfs4_exception exception = { };
3323         int err;
3324         do {
3325                 err = nfs4_handle_exception(NFS_SERVER(dir),
3326                                 _nfs4_proc_symlink(dir, dentry, page,
3327                                                         len, sattr),
3328                                 &exception);
3329         } while (exception.retry);
3330         return err;
3331 }
3332
3333 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3334                 struct iattr *sattr)
3335 {
3336         struct nfs4_createdata *data;
3337         int status = -ENOMEM;
3338
3339         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3340         if (data == NULL)
3341                 goto out;
3342
3343         status = nfs4_do_create(dir, dentry, data);
3344
3345         nfs4_free_createdata(data);
3346 out:
3347         return status;
3348 }
3349
3350 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3351                 struct iattr *sattr)
3352 {
3353         struct nfs4_exception exception = { };
3354         int err;
3355
3356         sattr->ia_mode &= ~current_umask();
3357         do {
3358                 err = nfs4_handle_exception(NFS_SERVER(dir),
3359                                 _nfs4_proc_mkdir(dir, dentry, sattr),
3360                                 &exception);
3361         } while (exception.retry);
3362         return err;
3363 }
3364
3365 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3366                 u64 cookie, struct page **pages, unsigned int count, int plus)
3367 {
3368         struct inode            *dir = dentry->d_inode;
3369         struct nfs4_readdir_arg args = {
3370                 .fh = NFS_FH(dir),
3371                 .pages = pages,
3372                 .pgbase = 0,
3373                 .count = count,
3374                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3375                 .plus = plus,
3376         };
3377         struct nfs4_readdir_res res;
3378         struct rpc_message msg = {
3379                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3380                 .rpc_argp = &args,
3381                 .rpc_resp = &res,
3382                 .rpc_cred = cred,
3383         };
3384         int                     status;
3385
3386         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3387                         dentry->d_parent->d_name.name,
3388                         dentry->d_name.name,
3389                         (unsigned long long)cookie);
3390         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3391         res.pgbase = args.pgbase;
3392         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3393         if (status >= 0) {
3394                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3395                 status += args.pgbase;
3396         }
3397
3398         nfs_invalidate_atime(dir);
3399
3400         dprintk("%s: returns %d\n", __func__, status);
3401         return status;
3402 }
3403
3404 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3405                 u64 cookie, struct page **pages, unsigned int count, int plus)
3406 {
3407         struct nfs4_exception exception = { };
3408         int err;
3409         do {
3410                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3411                                 _nfs4_proc_readdir(dentry, cred, cookie,
3412                                         pages, count, plus),
3413                                 &exception);
3414         } while (exception.retry);
3415         return err;
3416 }
3417
3418 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3419                 struct iattr *sattr, dev_t rdev)
3420 {
3421         struct nfs4_createdata *data;
3422         int mode = sattr->ia_mode;
3423         int status = -ENOMEM;
3424
3425         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3426         if (data == NULL)
3427                 goto out;
3428
3429         if (S_ISFIFO(mode))
3430                 data->arg.ftype = NF4FIFO;
3431         else if (S_ISBLK(mode)) {
3432                 data->arg.ftype = NF4BLK;
3433                 data->arg.u.device.specdata1 = MAJOR(rdev);
3434                 data->arg.u.device.specdata2 = MINOR(rdev);
3435         }
3436         else if (S_ISCHR(mode)) {
3437                 data->arg.ftype = NF4CHR;
3438                 data->arg.u.device.specdata1 = MAJOR(rdev);
3439                 data->arg.u.device.specdata2 = MINOR(rdev);
3440         } else if (!S_ISSOCK(mode)) {
3441                 status = -EINVAL;
3442                 goto out_free;
3443         }
3444         
3445         status = nfs4_do_create(dir, dentry, data);
3446 out_free:
3447         nfs4_free_createdata(data);
3448 out:
3449         return status;
3450 }
3451
3452 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3453                 struct iattr *sattr, dev_t rdev)
3454 {
3455         struct nfs4_exception exception = { };
3456         int err;
3457
3458         sattr->ia_mode &= ~current_umask();
3459         do {
3460                 err = nfs4_handle_exception(NFS_SERVER(dir),
3461                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3462                                 &exception);
3463         } while (exception.retry);
3464         return err;
3465 }
3466
3467 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3468                  struct nfs_fsstat *fsstat)
3469 {
3470         struct nfs4_statfs_arg args = {
3471                 .fh = fhandle,
3472                 .bitmask = server->attr_bitmask,
3473         };
3474         struct nfs4_statfs_res res = {
3475                 .fsstat = fsstat,
3476         };
3477         struct rpc_message msg = {
3478                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3479                 .rpc_argp = &args,
3480                 .rpc_resp = &res,
3481         };
3482
3483         nfs_fattr_init(fsstat->fattr);
3484         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3485 }
3486
3487 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3488 {
3489         struct nfs4_exception exception = { };
3490         int err;
3491         do {
3492                 err = nfs4_handle_exception(server,
3493                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3494                                 &exception);
3495         } while (exception.retry);
3496         return err;
3497 }
3498
3499 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3500                 struct nfs_fsinfo *fsinfo)
3501 {
3502         struct nfs4_fsinfo_arg args = {
3503                 .fh = fhandle,
3504                 .bitmask = server->attr_bitmask,
3505         };
3506         struct nfs4_fsinfo_res res = {
3507                 .fsinfo = fsinfo,
3508         };
3509         struct rpc_message msg = {
3510                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3511                 .rpc_argp = &args,
3512                 .rpc_resp = &res,
3513         };
3514
3515         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3516 }
3517
3518 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3519 {
3520         struct nfs4_exception exception = { };
3521         unsigned long now = jiffies;
3522         int err;
3523
3524         do {
3525                 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
3526                 if (err == 0) {
3527                         struct nfs_client *clp = server->nfs_client;
3528
3529                         spin_lock(&clp->cl_lock);
3530                         clp->cl_lease_time = fsinfo->lease_time * HZ;
3531                         clp->cl_last_renewal = now;
3532                         spin_unlock(&clp->cl_lock);
3533                         break;
3534                 }
3535                 err = nfs4_handle_exception(server, err, &exception);
3536         } while (exception.retry);
3537         return err;
3538 }
3539
3540 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3541 {
3542         int error;
3543
3544         nfs_fattr_init(fsinfo->fattr);
3545         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
3546         if (error == 0) {
3547                 /* block layout checks this! */
3548                 server->pnfs_blksize = fsinfo->blksize;
3549                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
3550         }
3551
3552         return error;
3553 }
3554
3555 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3556                 struct nfs_pathconf *pathconf)
3557 {
3558         struct nfs4_pathconf_arg args = {
3559                 .fh = fhandle,
3560                 .bitmask = server->attr_bitmask,
3561         };
3562         struct nfs4_pathconf_res res = {
3563                 .pathconf = pathconf,
3564         };
3565         struct rpc_message msg = {
3566                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3567                 .rpc_argp = &args,
3568                 .rpc_resp = &res,
3569         };
3570
3571         /* None of the pathconf attributes are mandatory to implement */
3572         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3573                 memset(pathconf, 0, sizeof(*pathconf));
3574                 return 0;
3575         }
3576
3577         nfs_fattr_init(pathconf->fattr);
3578         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3579 }
3580
3581 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3582                 struct nfs_pathconf *pathconf)
3583 {
3584         struct nfs4_exception exception = { };
3585         int err;
3586
3587         do {
3588                 err = nfs4_handle_exception(server,
3589                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3590                                 &exception);
3591         } while (exception.retry);
3592         return err;
3593 }
3594
3595 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
3596                 const struct nfs_open_context *ctx,
3597                 const struct nfs_lock_context *l_ctx,
3598                 fmode_t fmode)
3599 {
3600         const struct nfs_lockowner *lockowner = NULL;
3601
3602         if (l_ctx != NULL)
3603                 lockowner = &l_ctx->lockowner;
3604         return nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner);
3605 }
3606 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
3607
3608 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
3609                 const struct nfs_open_context *ctx,
3610                 const struct nfs_lock_context *l_ctx,
3611                 fmode_t fmode)
3612 {
3613         nfs4_stateid current_stateid;
3614
3615         if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode))
3616                 return false;
3617         return nfs4_stateid_match(stateid, &current_stateid);
3618 }
3619
3620 static bool nfs4_error_stateid_expired(int err)
3621 {
3622         switch (err) {
3623         case -NFS4ERR_DELEG_REVOKED:
3624         case -NFS4ERR_ADMIN_REVOKED:
3625         case -NFS4ERR_BAD_STATEID:
3626         case -NFS4ERR_STALE_STATEID:
3627         case -NFS4ERR_OLD_STATEID:
3628         case -NFS4ERR_OPENMODE:
3629         case -NFS4ERR_EXPIRED:
3630                 return true;
3631         }
3632         return false;
3633 }
3634
3635 void __nfs4_read_done_cb(struct nfs_read_data *data)
3636 {
3637         nfs_invalidate_atime(data->header->inode);
3638 }
3639
3640 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3641 {
3642         struct nfs_server *server = NFS_SERVER(data->header->inode);
3643
3644         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3645                 rpc_restart_call_prepare(task);
3646                 return -EAGAIN;
3647         }
3648
3649         __nfs4_read_done_cb(data);
3650         if (task->tk_status > 0)
3651                 renew_lease(server, data->timestamp);
3652         return 0;
3653 }
3654
3655 static bool nfs4_read_stateid_changed(struct rpc_task *task,
3656                 struct nfs_readargs *args)
3657 {
3658
3659         if (!nfs4_error_stateid_expired(task->tk_status) ||
3660                 nfs4_stateid_is_current(&args->stateid,
3661                                 args->context,
3662                                 args->lock_context,
3663                                 FMODE_READ))
3664                 return false;
3665         rpc_restart_call_prepare(task);
3666         return true;
3667 }
3668
3669 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3670 {
3671
3672         dprintk("--> %s\n", __func__);
3673
3674         if (!nfs4_sequence_done(task, &data->res.seq_res))
3675                 return -EAGAIN;
3676         if (nfs4_read_stateid_changed(task, &data->args))
3677                 return -EAGAIN;
3678         return data->read_done_cb ? data->read_done_cb(task, data) :
3679                                     nfs4_read_done_cb(task, data);
3680 }
3681
3682 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3683 {
3684         data->timestamp   = jiffies;
3685         data->read_done_cb = nfs4_read_done_cb;
3686         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3687         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
3688 }
3689
3690 static void nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
3691 {
3692         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3693                         &data->args.seq_args,
3694                         &data->res.seq_res,
3695                         task))
3696                 return;
3697         nfs4_set_rw_stateid(&data->args.stateid, data->args.context,
3698                         data->args.lock_context, FMODE_READ);
3699 }
3700
3701 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3702 {
3703         struct inode *inode = data->header->inode;
3704         
3705         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3706                 rpc_restart_call_prepare(task);
3707                 return -EAGAIN;
3708         }
3709         if (task->tk_status >= 0) {
3710                 renew_lease(NFS_SERVER(inode), data->timestamp);
3711                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
3712         }
3713         return 0;
3714 }
3715
3716 static bool nfs4_write_stateid_changed(struct rpc_task *task,
3717                 struct nfs_writeargs *args)
3718 {
3719
3720         if (!nfs4_error_stateid_expired(task->tk_status) ||
3721                 nfs4_stateid_is_current(&args->stateid,
3722                                 args->context,
3723                                 args->lock_context,
3724                                 FMODE_WRITE))
3725                 return false;
3726         rpc_restart_call_prepare(task);
3727         return true;
3728 }
3729
3730 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3731 {
3732         if (!nfs4_sequence_done(task, &data->res.seq_res))
3733                 return -EAGAIN;
3734         if (nfs4_write_stateid_changed(task, &data->args))
3735                 return -EAGAIN;
3736         return data->write_done_cb ? data->write_done_cb(task, data) :
3737                 nfs4_write_done_cb(task, data);
3738 }
3739
3740 static
3741 bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data)
3742 {
3743         const struct nfs_pgio_header *hdr = data->header;
3744
3745         /* Don't request attributes for pNFS or O_DIRECT writes */
3746         if (data->ds_clp != NULL || hdr->dreq != NULL)
3747                 return false;
3748         /* Otherwise, request attributes if and only if we don't hold
3749          * a delegation
3750          */
3751         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
3752 }
3753
3754 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3755 {
3756         struct nfs_server *server = NFS_SERVER(data->header->inode);
3757
3758         if (!nfs4_write_need_cache_consistency_data(data)) {
3759                 data->args.bitmask = NULL;
3760                 data->res.fattr = NULL;
3761         } else
3762                 data->args.bitmask = server->cache_consistency_bitmask;
3763
3764         if (!data->write_done_cb)
3765                 data->write_done_cb = nfs4_write_done_cb;
3766         data->res.server = server;
3767         data->timestamp   = jiffies;
3768
3769         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3770         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3771 }
3772
3773 static void nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
3774 {
3775         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3776                         &data->args.seq_args,
3777                         &data->res.seq_res,
3778                         task))
3779                 return;
3780         nfs4_set_rw_stateid(&data->args.stateid, data->args.context,
3781                         data->args.lock_context, FMODE_WRITE);
3782 }
3783
3784 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
3785 {
3786         nfs4_setup_sequence(NFS_SERVER(data->inode),
3787                         &data->args.seq_args,
3788                         &data->res.seq_res,
3789                         task);
3790 }
3791
3792 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
3793 {
3794         struct inode *inode = data->inode;
3795
3796         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3797                 rpc_restart_call_prepare(task);
3798                 return -EAGAIN;
3799         }
3800         return 0;
3801 }
3802
3803 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
3804 {
3805         if (!nfs4_sequence_done(task, &data->res.seq_res))
3806                 return -EAGAIN;
3807         return data->commit_done_cb(task, data);
3808 }
3809
3810 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
3811 {
3812         struct nfs_server *server = NFS_SERVER(data->inode);
3813
3814         if (data->commit_done_cb == NULL)
3815                 data->commit_done_cb = nfs4_commit_done_cb;
3816         data->res.server = server;
3817         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3818         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3819 }
3820
3821 struct nfs4_renewdata {
3822         struct nfs_client       *client;
3823         unsigned long           timestamp;
3824 };
3825
3826 /*
3827  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3828  * standalone procedure for queueing an asynchronous RENEW.
3829  */
3830 static void nfs4_renew_release(void *calldata)
3831 {
3832         struct nfs4_renewdata *data = calldata;
3833         struct nfs_client *clp = data->client;
3834
3835         if (atomic_read(&clp->cl_count) > 1)
3836                 nfs4_schedule_state_renewal(clp);
3837         nfs_put_client(clp);
3838         kfree(data);
3839 }
3840
3841 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3842 {
3843         struct nfs4_renewdata *data = calldata;
3844         struct nfs_client *clp = data->client;
3845         unsigned long timestamp = data->timestamp;
3846
3847         if (task->tk_status < 0) {
3848                 /* Unless we're shutting down, schedule state recovery! */
3849                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3850                         return;
3851                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3852                         nfs4_schedule_lease_recovery(clp);
3853                         return;
3854                 }
3855                 nfs4_schedule_path_down_recovery(clp);
3856         }
3857         do_renew_lease(clp, timestamp);
3858 }
3859
3860 static const struct rpc_call_ops nfs4_renew_ops = {
3861         .rpc_call_done = nfs4_renew_done,
3862         .rpc_release = nfs4_renew_release,
3863 };
3864
3865 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3866 {
3867         struct rpc_message msg = {
3868                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3869                 .rpc_argp       = clp,
3870                 .rpc_cred       = cred,
3871         };
3872         struct nfs4_renewdata *data;
3873
3874         if (renew_flags == 0)
3875                 return 0;
3876         if (!atomic_inc_not_zero(&clp->cl_count))
3877                 return -EIO;
3878         data = kmalloc(sizeof(*data), GFP_NOFS);
3879         if (data == NULL)
3880                 return -ENOMEM;
3881         data->client = clp;
3882         data->timestamp = jiffies;
3883         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
3884                         &nfs4_renew_ops, data);
3885 }
3886
3887 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3888 {
3889         struct rpc_message msg = {
3890                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3891                 .rpc_argp       = clp,
3892                 .rpc_cred       = cred,
3893         };
3894         unsigned long now = jiffies;
3895         int status;
3896
3897         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3898         if (status < 0)
3899                 return status;
3900         do_renew_lease(clp, now);
3901         return 0;
3902 }
3903
3904 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3905 {
3906         return (server->caps & NFS_CAP_ACLS)
3907                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3908                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3909 }
3910
3911 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
3912  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
3913  * the stack.
3914  */
3915 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
3916
3917 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3918                 struct page **pages, unsigned int *pgbase)
3919 {
3920         struct page *newpage, **spages;
3921         int rc = 0;
3922         size_t len;
3923         spages = pages;
3924
3925         do {
3926                 len = min_t(size_t, PAGE_SIZE, buflen);
3927                 newpage = alloc_page(GFP_KERNEL);
3928
3929                 if (newpage == NULL)
3930                         goto unwind;
3931                 memcpy(page_address(newpage), buf, len);
3932                 buf += len;
3933                 buflen -= len;
3934                 *pages++ = newpage;
3935                 rc++;
3936         } while (buflen != 0);
3937
3938         return rc;
3939
3940 unwind:
3941         for(; rc > 0; rc--)
3942                 __free_page(spages[rc-1]);
3943         return -ENOMEM;
3944 }
3945
3946 struct nfs4_cached_acl {
3947         int cached;
3948         size_t len;
3949         char data[0];
3950 };
3951
3952 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3953 {
3954         struct nfs_inode *nfsi = NFS_I(inode);
3955
3956         spin_lock(&inode->i_lock);
3957         kfree(nfsi->nfs4_acl);
3958         nfsi->nfs4_acl = acl;
3959         spin_unlock(&inode->i_lock);
3960 }
3961
3962 static void nfs4_zap_acl_attr(struct inode *inode)
3963 {
3964         nfs4_set_cached_acl(inode, NULL);
3965 }
3966
3967 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3968 {
3969         struct nfs_inode *nfsi = NFS_I(inode);
3970         struct nfs4_cached_acl *acl;
3971         int ret = -ENOENT;
3972
3973         spin_lock(&inode->i_lock);
3974         acl = nfsi->nfs4_acl;
3975         if (acl == NULL)
3976                 goto out;
3977         if (buf == NULL) /* user is just asking for length */
3978                 goto out_len;
3979         if (acl->cached == 0)
3980                 goto out;
3981         ret = -ERANGE; /* see getxattr(2) man page */
3982         if (acl->len > buflen)
3983                 goto out;
3984         memcpy(buf, acl->data, acl->len);
3985 out_len:
3986         ret = acl->len;
3987 out:
3988         spin_unlock(&inode->i_lock);
3989         return ret;
3990 }
3991
3992 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
3993 {
3994         struct nfs4_cached_acl *acl;
3995         size_t buflen = sizeof(*acl) + acl_len;
3996
3997         if (buflen <= PAGE_SIZE) {
3998                 acl = kmalloc(buflen, GFP_KERNEL);
3999                 if (acl == NULL)
4000                         goto out;
4001                 acl->cached = 1;
4002                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
4003         } else {
4004                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
4005                 if (acl == NULL)
4006                         goto out;
4007                 acl->cached = 0;
4008         }
4009         acl->len = acl_len;
4010 out:
4011         nfs4_set_cached_acl(inode, acl);
4012 }
4013
4014 /*
4015  * The getxattr API returns the required buffer length when called with a
4016  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
4017  * the required buf.  On a NULL buf, we send a page of data to the server
4018  * guessing that the ACL request can be serviced by a page. If so, we cache
4019  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
4020  * the cache. If not so, we throw away the page, and cache the required
4021  * length. The next getxattr call will then produce another round trip to
4022  * the server, this time with the input buf of the required size.
4023  */
4024 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4025 {
4026         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
4027         struct nfs_getaclargs args = {
4028                 .fh = NFS_FH(inode),
4029                 .acl_pages = pages,
4030                 .acl_len = buflen,
4031         };
4032         struct nfs_getaclres res = {
4033                 .acl_len = buflen,
4034         };
4035         struct rpc_message msg = {
4036                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
4037                 .rpc_argp = &args,
4038                 .rpc_resp = &res,
4039         };
4040         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4041         int ret = -ENOMEM, i;
4042
4043         /* As long as we're doing a round trip to the server anyway,
4044          * let's be prepared for a page of acl data. */
4045         if (npages == 0)
4046                 npages = 1;
4047         if (npages > ARRAY_SIZE(pages))
4048                 return -ERANGE;
4049
4050         for (i = 0; i < npages; i++) {
4051                 pages[i] = alloc_page(GFP_KERNEL);
4052                 if (!pages[i])
4053                         goto out_free;
4054         }
4055
4056         /* for decoding across pages */
4057         res.acl_scratch = alloc_page(GFP_KERNEL);
4058         if (!res.acl_scratch)
4059                 goto out_free;
4060
4061         args.acl_len = npages * PAGE_SIZE;
4062         args.acl_pgbase = 0;
4063
4064         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
4065                 __func__, buf, buflen, npages, args.acl_len);
4066         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
4067                              &msg, &args.seq_args, &res.seq_res, 0);
4068         if (ret)
4069                 goto out_free;
4070
4071         /* Handle the case where the passed-in buffer is too short */
4072         if (res.acl_flags & NFS4_ACL_TRUNC) {
4073                 /* Did the user only issue a request for the acl length? */
4074                 if (buf == NULL)
4075                         goto out_ok;
4076                 ret = -ERANGE;
4077                 goto out_free;
4078         }
4079         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
4080         if (buf) {
4081                 if (res.acl_len > buflen) {
4082                         ret = -ERANGE;
4083                         goto out_free;
4084                 }
4085                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
4086         }
4087 out_ok:
4088         ret = res.acl_len;
4089 out_free:
4090         for (i = 0; i < npages; i++)
4091                 if (pages[i])
4092                         __free_page(pages[i]);
4093         if (res.acl_scratch)
4094                 __free_page(res.acl_scratch);
4095         return ret;
4096 }
4097
4098 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4099 {
4100         struct nfs4_exception exception = { };
4101         ssize_t ret;
4102         do {
4103                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
4104                 if (ret >= 0)
4105                         break;
4106                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
4107         } while (exception.retry);
4108         return ret;
4109 }
4110
4111 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
4112 {
4113         struct nfs_server *server = NFS_SERVER(inode);
4114         int ret;
4115
4116         if (!nfs4_server_supports_acls(server))
4117                 return -EOPNOTSUPP;
4118         ret = nfs_revalidate_inode(server, inode);
4119         if (ret < 0)
4120                 return ret;
4121         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
4122                 nfs_zap_acl_cache(inode);
4123         ret = nfs4_read_cached_acl(inode, buf, buflen);
4124         if (ret != -ENOENT)
4125                 /* -ENOENT is returned if there is no ACL or if there is an ACL
4126                  * but no cached acl data, just the acl length */
4127                 return ret;
4128         return nfs4_get_acl_uncached(inode, buf, buflen);
4129 }
4130
4131 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4132 {
4133         struct nfs_server *server = NFS_SERVER(inode);
4134         struct page *pages[NFS4ACL_MAXPAGES];
4135         struct nfs_setaclargs arg = {
4136                 .fh             = NFS_FH(inode),
4137                 .acl_pages      = pages,
4138                 .acl_len        = buflen,
4139         };
4140         struct nfs_setaclres res;
4141         struct rpc_message msg = {
4142                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
4143                 .rpc_argp       = &arg,
4144                 .rpc_resp       = &res,
4145         };
4146         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4147         int ret, i;
4148
4149         if (!nfs4_server_supports_acls(server))
4150                 return -EOPNOTSUPP;
4151         if (npages > ARRAY_SIZE(pages))
4152                 return -ERANGE;
4153         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
4154         if (i < 0)
4155                 return i;
4156         nfs4_inode_return_delegation(inode);
4157         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4158
4159         /*
4160          * Free each page after tx, so the only ref left is
4161          * held by the network stack
4162          */
4163         for (; i > 0; i--)
4164                 put_page(pages[i-1]);
4165
4166         /*
4167          * Acl update can result in inode attribute update.
4168          * so mark the attribute cache invalid.
4169          */
4170         spin_lock(&inode->i_lock);
4171         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
4172         spin_unlock(&inode->i_lock);
4173         nfs_access_zap_cache(inode);
4174         nfs_zap_acl_cache(inode);
4175         return ret;
4176 }
4177
4178 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4179 {
4180         struct nfs4_exception exception = { };
4181         int err;
4182         do {
4183                 err = nfs4_handle_exception(NFS_SERVER(inode),
4184                                 __nfs4_proc_set_acl(inode, buf, buflen),
4185                                 &exception);
4186         } while (exception.retry);
4187         return err;
4188 }
4189
4190 static int
4191 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
4192 {
4193         struct nfs_client *clp = server->nfs_client;
4194
4195         if (task->tk_status >= 0)
4196                 return 0;
4197         switch(task->tk_status) {
4198                 case -NFS4ERR_DELEG_REVOKED:
4199                 case -NFS4ERR_ADMIN_REVOKED:
4200                 case -NFS4ERR_BAD_STATEID:
4201                         if (state == NULL)
4202                                 break;
4203                         nfs_remove_bad_delegation(state->inode);
4204                 case -NFS4ERR_OPENMODE:
4205                         if (state == NULL)
4206                                 break;
4207                         if (nfs4_schedule_stateid_recovery(server, state) < 0)
4208                                 goto stateid_invalid;
4209                         goto wait_on_recovery;
4210                 case -NFS4ERR_EXPIRED:
4211                         if (state != NULL) {
4212                                 if (nfs4_schedule_stateid_recovery(server, state) < 0)
4213                                         goto stateid_invalid;
4214                         }
4215                 case -NFS4ERR_STALE_STATEID:
4216                 case -NFS4ERR_STALE_CLIENTID:
4217                         nfs4_schedule_lease_recovery(clp);
4218                         goto wait_on_recovery;
4219 #if defined(CONFIG_NFS_V4_1)
4220                 case -NFS4ERR_BADSESSION:
4221                 case -NFS4ERR_BADSLOT:
4222                 case -NFS4ERR_BAD_HIGH_SLOT:
4223                 case -NFS4ERR_DEADSESSION:
4224                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4225                 case -NFS4ERR_SEQ_FALSE_RETRY:
4226                 case -NFS4ERR_SEQ_MISORDERED:
4227                         dprintk("%s ERROR %d, Reset session\n", __func__,
4228                                 task->tk_status);
4229                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
4230                         task->tk_status = 0;
4231                         return -EAGAIN;
4232 #endif /* CONFIG_NFS_V4_1 */
4233                 case -NFS4ERR_DELAY:
4234                         nfs_inc_server_stats(server, NFSIOS_DELAY);
4235                 case -NFS4ERR_GRACE:
4236                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
4237                         task->tk_status = 0;
4238                         return -EAGAIN;
4239                 case -NFS4ERR_RETRY_UNCACHED_REP:
4240                 case -NFS4ERR_OLD_STATEID:
4241                         task->tk_status = 0;
4242                         return -EAGAIN;
4243         }
4244         task->tk_status = nfs4_map_errors(task->tk_status);
4245         return 0;
4246 stateid_invalid:
4247         task->tk_status = -EIO;
4248         return 0;
4249 wait_on_recovery:
4250         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
4251         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
4252                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
4253         task->tk_status = 0;
4254         return -EAGAIN;
4255 }
4256
4257 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
4258                                     nfs4_verifier *bootverf)
4259 {
4260         __be32 verf[2];
4261
4262         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
4263                 /* An impossible timestamp guarantees this value
4264                  * will never match a generated boot time. */
4265                 verf[0] = 0;
4266                 verf[1] = (__be32)(NSEC_PER_SEC + 1);
4267         } else {
4268                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4269                 verf[0] = (__be32)nn->boot_time.tv_sec;
4270                 verf[1] = (__be32)nn->boot_time.tv_nsec;
4271         }
4272         memcpy(bootverf->data, verf, sizeof(bootverf->data));
4273 }
4274
4275 static unsigned int
4276 nfs4_init_nonuniform_client_string(const struct nfs_client *clp,
4277                                    char *buf, size_t len)
4278 {
4279         unsigned int result;
4280
4281         rcu_read_lock();
4282         result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4283                                 clp->cl_ipaddr,
4284                                 rpc_peeraddr2str(clp->cl_rpcclient,
4285                                                         RPC_DISPLAY_ADDR),
4286                                 rpc_peeraddr2str(clp->cl_rpcclient,
4287                                                         RPC_DISPLAY_PROTO));
4288         rcu_read_unlock();
4289         return result;
4290 }
4291
4292 static unsigned int
4293 nfs4_init_uniform_client_string(const struct nfs_client *clp,
4294                                 char *buf, size_t len)
4295 {
4296         char *nodename = clp->cl_rpcclient->cl_nodename;
4297
4298         if (nfs4_client_id_uniquifier[0] != '\0')
4299                 nodename = nfs4_client_id_uniquifier;
4300         return scnprintf(buf, len, "Linux NFSv%u.%u %s",
4301                                 clp->rpc_ops->version, clp->cl_minorversion,
4302                                 nodename);
4303 }
4304
4305 /**
4306  * nfs4_proc_setclientid - Negotiate client ID
4307  * @clp: state data structure
4308  * @program: RPC program for NFSv4 callback service
4309  * @port: IP port number for NFS4 callback service
4310  * @cred: RPC credential to use for this call
4311  * @res: where to place the result
4312  *
4313  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4314  */
4315 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
4316                 unsigned short port, struct rpc_cred *cred,
4317                 struct nfs4_setclientid_res *res)
4318 {
4319         nfs4_verifier sc_verifier;
4320         struct nfs4_setclientid setclientid = {
4321                 .sc_verifier = &sc_verifier,
4322                 .sc_prog = program,
4323                 .sc_cb_ident = clp->cl_cb_ident,
4324         };
4325         struct rpc_message msg = {
4326                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
4327                 .rpc_argp = &setclientid,
4328                 .rpc_resp = res,
4329                 .rpc_cred = cred,
4330         };
4331         int status;
4332
4333         /* nfs_client_id4 */
4334         nfs4_init_boot_verifier(clp, &sc_verifier);
4335         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
4336                 setclientid.sc_name_len =
4337                                 nfs4_init_uniform_client_string(clp,
4338                                                 setclientid.sc_name,
4339                                                 sizeof(setclientid.sc_name));
4340         else
4341                 setclientid.sc_name_len =
4342                                 nfs4_init_nonuniform_client_string(clp,
4343                                                 setclientid.sc_name,
4344                                                 sizeof(setclientid.sc_name));
4345         /* cb_client4 */
4346         rcu_read_lock();
4347         setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
4348                                 sizeof(setclientid.sc_netid),
4349                                 rpc_peeraddr2str(clp->cl_rpcclient,
4350                                                         RPC_DISPLAY_NETID));
4351         rcu_read_unlock();
4352         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
4353                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
4354                                 clp->cl_ipaddr, port >> 8, port & 255);
4355
4356         dprintk("NFS call  setclientid auth=%s, '%.*s'\n",
4357                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4358                 setclientid.sc_name_len, setclientid.sc_name);
4359         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4360         dprintk("NFS reply setclientid: %d\n", status);
4361         return status;
4362 }
4363
4364 /**
4365  * nfs4_proc_setclientid_confirm - Confirm client ID
4366  * @clp: state data structure
4367  * @res: result of a previous SETCLIENTID
4368  * @cred: RPC credential to use for this call
4369  *
4370  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4371  */
4372 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
4373                 struct nfs4_setclientid_res *arg,
4374                 struct rpc_cred *cred)
4375 {
4376         struct rpc_message msg = {
4377                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4378                 .rpc_argp = arg,
4379                 .rpc_cred = cred,
4380         };
4381         int status;
4382
4383         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
4384                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4385                 clp->cl_clientid);
4386         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4387         dprintk("NFS reply setclientid_confirm: %d\n", status);
4388         return status;
4389 }
4390
4391 struct nfs4_delegreturndata {
4392         struct nfs4_delegreturnargs args;
4393         struct nfs4_delegreturnres res;
4394         struct nfs_fh fh;
4395         nfs4_stateid stateid;
4396         unsigned long timestamp;
4397         struct nfs_fattr fattr;
4398         int rpc_status;
4399 };
4400
4401 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4402 {
4403         struct nfs4_delegreturndata *data = calldata;
4404
4405         if (!nfs4_sequence_done(task, &data->res.seq_res))
4406                 return;
4407
4408         switch (task->tk_status) {
4409         case -NFS4ERR_STALE_STATEID:
4410         case -NFS4ERR_EXPIRED:
4411         case 0:
4412                 renew_lease(data->res.server, data->timestamp);
4413                 break;
4414         default:
4415                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
4416                                 -EAGAIN) {
4417                         rpc_restart_call_prepare(task);
4418                         return;
4419                 }
4420         }
4421         data->rpc_status = task->tk_status;
4422 }
4423
4424 static void nfs4_delegreturn_release(void *calldata)
4425 {
4426         kfree(calldata);
4427 }
4428
4429 #if defined(CONFIG_NFS_V4_1)
4430 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
4431 {
4432         struct nfs4_delegreturndata *d_data;
4433
4434         d_data = (struct nfs4_delegreturndata *)data;
4435
4436         nfs4_setup_sequence(d_data->res.server,
4437                         &d_data->args.seq_args,
4438                         &d_data->res.seq_res,
4439                         task);
4440 }
4441 #endif /* CONFIG_NFS_V4_1 */
4442
4443 static const struct rpc_call_ops nfs4_delegreturn_ops = {
4444 #if defined(CONFIG_NFS_V4_1)
4445         .rpc_call_prepare = nfs4_delegreturn_prepare,
4446 #endif /* CONFIG_NFS_V4_1 */
4447         .rpc_call_done = nfs4_delegreturn_done,
4448         .rpc_release = nfs4_delegreturn_release,
4449 };
4450
4451 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4452 {
4453         struct nfs4_delegreturndata *data;
4454         struct nfs_server *server = NFS_SERVER(inode);
4455         struct rpc_task *task;
4456         struct rpc_message msg = {
4457                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
4458                 .rpc_cred = cred,
4459         };
4460         struct rpc_task_setup task_setup_data = {
4461                 .rpc_client = server->client,
4462                 .rpc_message = &msg,
4463                 .callback_ops = &nfs4_delegreturn_ops,
4464                 .flags = RPC_TASK_ASYNC,
4465         };
4466         int status = 0;
4467
4468         data = kzalloc(sizeof(*data), GFP_NOFS);
4469         if (data == NULL)
4470                 return -ENOMEM;
4471         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4472         data->args.fhandle = &data->fh;
4473         data->args.stateid = &data->stateid;
4474         data->args.bitmask = server->cache_consistency_bitmask;
4475         nfs_copy_fh(&data->fh, NFS_FH(inode));
4476         nfs4_stateid_copy(&data->stateid, stateid);
4477         data->res.fattr = &data->fattr;
4478         data->res.server = server;
4479         nfs_fattr_init(data->res.fattr);
4480         data->timestamp = jiffies;
4481         data->rpc_status = 0;
4482
4483         task_setup_data.callback_data = data;
4484         msg.rpc_argp = &data->args;
4485         msg.rpc_resp = &data->res;
4486         task = rpc_run_task(&task_setup_data);
4487         if (IS_ERR(task))
4488                 return PTR_ERR(task);
4489         if (!issync)
4490                 goto out;
4491         status = nfs4_wait_for_completion_rpc_task(task);
4492         if (status != 0)
4493                 goto out;
4494         status = data->rpc_status;
4495         if (status == 0)
4496                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4497         else
4498                 nfs_refresh_inode(inode, &data->fattr);
4499 out:
4500         rpc_put_task(task);
4501         return status;
4502 }
4503
4504 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4505 {
4506         struct nfs_server *server = NFS_SERVER(inode);
4507         struct nfs4_exception exception = { };
4508         int err;
4509         do {
4510                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
4511                 switch (err) {
4512                         case -NFS4ERR_STALE_STATEID:
4513                         case -NFS4ERR_EXPIRED:
4514                         case 0:
4515                                 return 0;
4516                 }
4517                 err = nfs4_handle_exception(server, err, &exception);
4518         } while (exception.retry);
4519         return err;
4520 }
4521
4522 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
4523 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
4524
4525 /* 
4526  * sleep, with exponential backoff, and retry the LOCK operation. 
4527  */
4528 static unsigned long
4529 nfs4_set_lock_task_retry(unsigned long timeout)
4530 {
4531         freezable_schedule_timeout_killable(timeout);
4532         timeout <<= 1;
4533         if (timeout > NFS4_LOCK_MAXTIMEOUT)
4534                 return NFS4_LOCK_MAXTIMEOUT;
4535         return timeout;
4536 }
4537
4538 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4539 {
4540         struct inode *inode = state->inode;
4541         struct nfs_server *server = NFS_SERVER(inode);
4542         struct nfs_client *clp = server->nfs_client;
4543         struct nfs_lockt_args arg = {
4544                 .fh = NFS_FH(inode),
4545                 .fl = request,
4546         };
4547         struct nfs_lockt_res res = {
4548                 .denied = request,
4549         };
4550         struct rpc_message msg = {
4551                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4552                 .rpc_argp       = &arg,
4553                 .rpc_resp       = &res,
4554                 .rpc_cred       = state->owner->so_cred,
4555         };
4556         struct nfs4_lock_state *lsp;
4557         int status;
4558
4559         arg.lock_owner.clientid = clp->cl_clientid;
4560         status = nfs4_set_lock_state(state, request);
4561         if (status != 0)
4562                 goto out;
4563         lsp = request->fl_u.nfs4_fl.owner;
4564         arg.lock_owner.id = lsp->ls_seqid.owner_id;
4565         arg.lock_owner.s_dev = server->s_dev;
4566         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4567         switch (status) {
4568                 case 0:
4569                         request->fl_type = F_UNLCK;
4570                         break;
4571                 case -NFS4ERR_DENIED:
4572                         status = 0;
4573         }
4574         request->fl_ops->fl_release_private(request);
4575 out:
4576         return status;
4577 }
4578
4579 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4580 {
4581         struct nfs4_exception exception = { };
4582         int err;
4583
4584         do {
4585                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4586                                 _nfs4_proc_getlk(state, cmd, request),
4587                                 &exception);
4588         } while (exception.retry);
4589         return err;
4590 }
4591
4592 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4593 {
4594         int res = 0;
4595         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4596                 case FL_POSIX:
4597                         res = posix_lock_file_wait(file, fl);
4598                         break;
4599                 case FL_FLOCK:
4600                         res = flock_lock_file_wait(file, fl);
4601                         break;
4602                 default:
4603                         BUG();
4604         }
4605         return res;
4606 }
4607
4608 struct nfs4_unlockdata {
4609         struct nfs_locku_args arg;
4610         struct nfs_locku_res res;
4611         struct nfs4_lock_state *lsp;
4612         struct nfs_open_context *ctx;
4613         struct file_lock fl;
4614         const struct nfs_server *server;
4615         unsigned long timestamp;
4616 };
4617
4618 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4619                 struct nfs_open_context *ctx,
4620                 struct nfs4_lock_state *lsp,
4621                 struct nfs_seqid *seqid)
4622 {
4623         struct nfs4_unlockdata *p;
4624         struct inode *inode = lsp->ls_state->inode;
4625
4626         p = kzalloc(sizeof(*p), GFP_NOFS);
4627         if (p == NULL)
4628                 return NULL;
4629         p->arg.fh = NFS_FH(inode);
4630         p->arg.fl = &p->fl;
4631         p->arg.seqid = seqid;
4632         p->res.seqid = seqid;
4633         p->arg.stateid = &lsp->ls_stateid;
4634         p->lsp = lsp;
4635         atomic_inc(&lsp->ls_count);
4636         /* Ensure we don't close file until we're done freeing locks! */
4637         p->ctx = get_nfs_open_context(ctx);
4638         memcpy(&p->fl, fl, sizeof(p->fl));
4639         p->server = NFS_SERVER(inode);
4640         return p;
4641 }
4642
4643 static void nfs4_locku_release_calldata(void *data)
4644 {
4645         struct nfs4_unlockdata *calldata = data;
4646         nfs_free_seqid(calldata->arg.seqid);
4647         nfs4_put_lock_state(calldata->lsp);
4648         put_nfs_open_context(calldata->ctx);
4649         kfree(calldata);
4650 }
4651
4652 static void nfs4_locku_done(struct rpc_task *task, void *data)
4653 {
4654         struct nfs4_unlockdata *calldata = data;
4655
4656         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4657                 return;
4658         switch (task->tk_status) {
4659                 case 0:
4660                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
4661                                         &calldata->res.stateid);
4662                         renew_lease(calldata->server, calldata->timestamp);
4663                         break;
4664                 case -NFS4ERR_BAD_STATEID:
4665                 case -NFS4ERR_OLD_STATEID:
4666                 case -NFS4ERR_STALE_STATEID:
4667                 case -NFS4ERR_EXPIRED:
4668                         break;
4669                 default:
4670                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4671                                 rpc_restart_call_prepare(task);
4672         }
4673         nfs_release_seqid(calldata->arg.seqid);
4674 }
4675
4676 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4677 {
4678         struct nfs4_unlockdata *calldata = data;
4679
4680         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4681                 goto out_wait;
4682         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
4683                 /* Note: exit _without_ running nfs4_locku_done */
4684                 goto out_no_action;
4685         }
4686         calldata->timestamp = jiffies;
4687         if (nfs4_setup_sequence(calldata->server,
4688                                 &calldata->arg.seq_args,
4689                                 &calldata->res.seq_res,
4690                                 task) != 0)
4691                 nfs_release_seqid(calldata->arg.seqid);
4692         return;
4693 out_no_action:
4694         task->tk_action = NULL;
4695 out_wait:
4696         nfs4_sequence_done(task, &calldata->res.seq_res);
4697 }
4698
4699 static const struct rpc_call_ops nfs4_locku_ops = {
4700         .rpc_call_prepare = nfs4_locku_prepare,
4701         .rpc_call_done = nfs4_locku_done,
4702         .rpc_release = nfs4_locku_release_calldata,
4703 };
4704
4705 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4706                 struct nfs_open_context *ctx,
4707                 struct nfs4_lock_state *lsp,
4708                 struct nfs_seqid *seqid)
4709 {
4710         struct nfs4_unlockdata *data;
4711         struct rpc_message msg = {
4712                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4713                 .rpc_cred = ctx->cred,
4714         };
4715         struct rpc_task_setup task_setup_data = {
4716                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4717                 .rpc_message = &msg,
4718                 .callback_ops = &nfs4_locku_ops,
4719                 .workqueue = nfsiod_workqueue,
4720                 .flags = RPC_TASK_ASYNC,
4721         };
4722
4723         /* Ensure this is an unlock - when canceling a lock, the
4724          * canceled lock is passed in, and it won't be an unlock.
4725          */
4726         fl->fl_type = F_UNLCK;
4727
4728         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4729         if (data == NULL) {
4730                 nfs_free_seqid(seqid);
4731                 return ERR_PTR(-ENOMEM);
4732         }
4733
4734         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4735         msg.rpc_argp = &data->arg;
4736         msg.rpc_resp = &data->res;
4737         task_setup_data.callback_data = data;
4738         return rpc_run_task(&task_setup_data);
4739 }
4740
4741 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4742 {
4743         struct inode *inode = state->inode;
4744         struct nfs4_state_owner *sp = state->owner;
4745         struct nfs_inode *nfsi = NFS_I(inode);
4746         struct nfs_seqid *seqid;
4747         struct nfs4_lock_state *lsp;
4748         struct rpc_task *task;
4749         int status = 0;
4750         unsigned char fl_flags = request->fl_flags;
4751
4752         status = nfs4_set_lock_state(state, request);
4753         /* Unlock _before_ we do the RPC call */
4754         request->fl_flags |= FL_EXISTS;
4755         /* Exclude nfs_delegation_claim_locks() */
4756         mutex_lock(&sp->so_delegreturn_mutex);
4757         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
4758         down_read(&nfsi->rwsem);
4759         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4760                 up_read(&nfsi->rwsem);
4761                 mutex_unlock(&sp->so_delegreturn_mutex);
4762                 goto out;
4763         }
4764         up_read(&nfsi->rwsem);
4765         mutex_unlock(&sp->so_delegreturn_mutex);
4766         if (status != 0)
4767                 goto out;
4768         /* Is this a delegated lock? */
4769         lsp = request->fl_u.nfs4_fl.owner;
4770         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
4771                 goto out;
4772         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4773         status = -ENOMEM;
4774         if (seqid == NULL)
4775                 goto out;
4776         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4777         status = PTR_ERR(task);
4778         if (IS_ERR(task))
4779                 goto out;
4780         status = nfs4_wait_for_completion_rpc_task(task);
4781         rpc_put_task(task);
4782 out:
4783         request->fl_flags = fl_flags;
4784         return status;
4785 }
4786
4787 struct nfs4_lockdata {
4788         struct nfs_lock_args arg;
4789         struct nfs_lock_res res;
4790         struct nfs4_lock_state *lsp;
4791         struct nfs_open_context *ctx;
4792         struct file_lock fl;
4793         unsigned long timestamp;
4794         int rpc_status;
4795         int cancelled;
4796         struct nfs_server *server;
4797 };
4798
4799 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4800                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4801                 gfp_t gfp_mask)
4802 {
4803         struct nfs4_lockdata *p;
4804         struct inode *inode = lsp->ls_state->inode;
4805         struct nfs_server *server = NFS_SERVER(inode);
4806
4807         p = kzalloc(sizeof(*p), gfp_mask);
4808         if (p == NULL)
4809                 return NULL;
4810
4811         p->arg.fh = NFS_FH(inode);
4812         p->arg.fl = &p->fl;
4813         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4814         if (p->arg.open_seqid == NULL)
4815                 goto out_free;
4816         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4817         if (p->arg.lock_seqid == NULL)
4818                 goto out_free_seqid;
4819         p->arg.lock_stateid = &lsp->ls_stateid;
4820         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4821         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
4822         p->arg.lock_owner.s_dev = server->s_dev;
4823         p->res.lock_seqid = p->arg.lock_seqid;
4824         p->lsp = lsp;
4825         p->server = server;
4826         atomic_inc(&lsp->ls_count);
4827         p->ctx = get_nfs_open_context(ctx);
4828         memcpy(&p->fl, fl, sizeof(p->fl));
4829         return p;
4830 out_free_seqid:
4831         nfs_free_seqid(p->arg.open_seqid);
4832 out_free:
4833         kfree(p);
4834         return NULL;
4835 }
4836
4837 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4838 {
4839         struct nfs4_lockdata *data = calldata;
4840         struct nfs4_state *state = data->lsp->ls_state;
4841
4842         dprintk("%s: begin!\n", __func__);
4843         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4844                 goto out_wait;
4845         /* Do we need to do an open_to_lock_owner? */
4846         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4847                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
4848                         goto out_release_lock_seqid;
4849                 }
4850                 data->arg.open_stateid = &state->open_stateid;
4851                 data->arg.new_lock_owner = 1;
4852                 data->res.open_seqid = data->arg.open_seqid;
4853         } else
4854                 data->arg.new_lock_owner = 0;
4855         if (!nfs4_valid_open_stateid(state)) {
4856                 data->rpc_status = -EBADF;
4857                 task->tk_action = NULL;
4858                 goto out_release_open_seqid;
4859         }
4860         data->timestamp = jiffies;
4861         if (nfs4_setup_sequence(data->server,
4862                                 &data->arg.seq_args,
4863                                 &data->res.seq_res,
4864                                 task) == 0)
4865                 return;
4866 out_release_open_seqid:
4867         nfs_release_seqid(data->arg.open_seqid);
4868 out_release_lock_seqid:
4869         nfs_release_seqid(data->arg.lock_seqid);
4870 out_wait:
4871         nfs4_sequence_done(task, &data->res.seq_res);
4872         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4873 }
4874
4875 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4876 {
4877         struct nfs4_lockdata *data = calldata;
4878
4879         dprintk("%s: begin!\n", __func__);
4880
4881         if (!nfs4_sequence_done(task, &data->res.seq_res))
4882                 return;
4883
4884         data->rpc_status = task->tk_status;
4885         if (data->arg.new_lock_owner != 0) {
4886                 if (data->rpc_status == 0)
4887                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4888                 else
4889                         goto out;
4890         }
4891         if (data->rpc_status == 0) {
4892                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
4893                 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags);
4894                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4895         }
4896 out:
4897         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4898 }
4899
4900 static void nfs4_lock_release(void *calldata)
4901 {
4902         struct nfs4_lockdata *data = calldata;
4903
4904         dprintk("%s: begin!\n", __func__);
4905         nfs_free_seqid(data->arg.open_seqid);
4906         if (data->cancelled != 0) {
4907                 struct rpc_task *task;
4908                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4909                                 data->arg.lock_seqid);
4910                 if (!IS_ERR(task))
4911                         rpc_put_task_async(task);
4912                 dprintk("%s: cancelling lock!\n", __func__);
4913         } else
4914                 nfs_free_seqid(data->arg.lock_seqid);
4915         nfs4_put_lock_state(data->lsp);
4916         put_nfs_open_context(data->ctx);
4917         kfree(data);
4918         dprintk("%s: done!\n", __func__);
4919 }
4920
4921 static const struct rpc_call_ops nfs4_lock_ops = {
4922         .rpc_call_prepare = nfs4_lock_prepare,
4923         .rpc_call_done = nfs4_lock_done,
4924         .rpc_release = nfs4_lock_release,
4925 };
4926
4927 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4928 {
4929         switch (error) {
4930         case -NFS4ERR_ADMIN_REVOKED:
4931         case -NFS4ERR_BAD_STATEID:
4932                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4933                 if (new_lock_owner != 0 ||
4934                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
4935                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4936                 break;
4937         case -NFS4ERR_STALE_STATEID:
4938                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4939         case -NFS4ERR_EXPIRED:
4940                 nfs4_schedule_lease_recovery(server->nfs_client);
4941         };
4942 }
4943
4944 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4945 {
4946         struct nfs4_lockdata *data;
4947         struct rpc_task *task;
4948         struct rpc_message msg = {
4949                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4950                 .rpc_cred = state->owner->so_cred,
4951         };
4952         struct rpc_task_setup task_setup_data = {
4953                 .rpc_client = NFS_CLIENT(state->inode),
4954                 .rpc_message = &msg,
4955                 .callback_ops = &nfs4_lock_ops,
4956                 .workqueue = nfsiod_workqueue,
4957                 .flags = RPC_TASK_ASYNC,
4958         };
4959         int ret;
4960
4961         dprintk("%s: begin!\n", __func__);
4962         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4963                         fl->fl_u.nfs4_fl.owner,
4964                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4965         if (data == NULL)
4966                 return -ENOMEM;
4967         if (IS_SETLKW(cmd))
4968                 data->arg.block = 1;
4969         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4970         msg.rpc_argp = &data->arg;
4971         msg.rpc_resp = &data->res;
4972         task_setup_data.callback_data = data;
4973         if (recovery_type > NFS_LOCK_NEW) {
4974                 if (recovery_type == NFS_LOCK_RECLAIM)
4975                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4976                 nfs4_set_sequence_privileged(&data->arg.seq_args);
4977         }
4978         task = rpc_run_task(&task_setup_data);
4979         if (IS_ERR(task))
4980                 return PTR_ERR(task);
4981         ret = nfs4_wait_for_completion_rpc_task(task);
4982         if (ret == 0) {
4983                 ret = data->rpc_status;
4984                 if (ret)
4985                         nfs4_handle_setlk_error(data->server, data->lsp,
4986                                         data->arg.new_lock_owner, ret);
4987         } else
4988                 data->cancelled = 1;
4989         rpc_put_task(task);
4990         dprintk("%s: done, ret = %d!\n", __func__, ret);
4991         return ret;
4992 }
4993
4994 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4995 {
4996         struct nfs_server *server = NFS_SERVER(state->inode);
4997         struct nfs4_exception exception = {
4998                 .inode = state->inode,
4999         };
5000         int err;
5001
5002         do {
5003                 /* Cache the lock if possible... */
5004                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5005                         return 0;
5006                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
5007                 if (err != -NFS4ERR_DELAY)
5008                         break;
5009                 nfs4_handle_exception(server, err, &exception);
5010         } while (exception.retry);
5011         return err;
5012 }
5013
5014 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
5015 {
5016         struct nfs_server *server = NFS_SERVER(state->inode);
5017         struct nfs4_exception exception = {
5018                 .inode = state->inode,
5019         };
5020         int err;
5021
5022         err = nfs4_set_lock_state(state, request);
5023         if (err != 0)
5024                 return err;
5025         do {
5026                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5027                         return 0;
5028                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
5029                 switch (err) {
5030                 default:
5031                         goto out;
5032                 case -NFS4ERR_GRACE:
5033                 case -NFS4ERR_DELAY:
5034                         nfs4_handle_exception(server, err, &exception);
5035                         err = 0;
5036                 }
5037         } while (exception.retry);
5038 out:
5039         return err;
5040 }
5041
5042 #if defined(CONFIG_NFS_V4_1)
5043 /**
5044  * nfs41_check_expired_locks - possibly free a lock stateid
5045  *
5046  * @state: NFSv4 state for an inode
5047  *
5048  * Returns NFS_OK if recovery for this stateid is now finished.
5049  * Otherwise a negative NFS4ERR value is returned.
5050  */
5051 static int nfs41_check_expired_locks(struct nfs4_state *state)
5052 {
5053         int status, ret = -NFS4ERR_BAD_STATEID;
5054         struct nfs4_lock_state *lsp;
5055         struct nfs_server *server = NFS_SERVER(state->inode);
5056
5057         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
5058                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
5059                         status = nfs41_test_stateid(server, &lsp->ls_stateid);
5060                         if (status != NFS_OK) {
5061                                 /* Free the stateid unless the server
5062                                  * informs us the stateid is unrecognized. */
5063                                 if (status != -NFS4ERR_BAD_STATEID)
5064                                         nfs41_free_stateid(server,
5065                                                         &lsp->ls_stateid);
5066                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
5067                                 ret = status;
5068                         }
5069                 }
5070         };
5071
5072         return ret;
5073 }
5074
5075 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
5076 {
5077         int status = NFS_OK;
5078
5079         if (test_bit(LK_STATE_IN_USE, &state->flags))
5080                 status = nfs41_check_expired_locks(state);
5081         if (status != NFS_OK)
5082                 status = nfs4_lock_expired(state, request);
5083         return status;
5084 }
5085 #endif
5086
5087 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5088 {
5089         struct nfs4_state_owner *sp = state->owner;
5090         struct nfs_inode *nfsi = NFS_I(state->inode);
5091         unsigned char fl_flags = request->fl_flags;
5092         unsigned int seq;
5093         int status = -ENOLCK;
5094
5095         if ((fl_flags & FL_POSIX) &&
5096                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
5097                 goto out;
5098         /* Is this a delegated open? */
5099         status = nfs4_set_lock_state(state, request);
5100         if (status != 0)
5101                 goto out;
5102         request->fl_flags |= FL_ACCESS;
5103         status = do_vfs_lock(request->fl_file, request);
5104         if (status < 0)
5105                 goto out;
5106         down_read(&nfsi->rwsem);
5107         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
5108                 /* Yes: cache locks! */
5109                 /* ...but avoid races with delegation recall... */
5110                 request->fl_flags = fl_flags & ~FL_SLEEP;
5111                 status = do_vfs_lock(request->fl_file, request);
5112                 goto out_unlock;
5113         }
5114         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
5115         up_read(&nfsi->rwsem);
5116         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
5117         if (status != 0)
5118                 goto out;
5119         down_read(&nfsi->rwsem);
5120         if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) {
5121                 status = -NFS4ERR_DELAY;
5122                 goto out_unlock;
5123         }
5124         /* Note: we always want to sleep here! */
5125         request->fl_flags = fl_flags | FL_SLEEP;
5126         if (do_vfs_lock(request->fl_file, request) < 0)
5127                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
5128                         "manager!\n", __func__);
5129 out_unlock:
5130         up_read(&nfsi->rwsem);
5131 out:
5132         request->fl_flags = fl_flags;
5133         return status;
5134 }
5135
5136 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5137 {
5138         struct nfs4_exception exception = {
5139                 .state = state,
5140                 .inode = state->inode,
5141         };
5142         int err;
5143
5144         do {
5145                 err = _nfs4_proc_setlk(state, cmd, request);
5146                 if (err == -NFS4ERR_DENIED)
5147                         err = -EAGAIN;
5148                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
5149                                 err, &exception);
5150         } while (exception.retry);
5151         return err;
5152 }
5153
5154 static int
5155 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
5156 {
5157         struct nfs_open_context *ctx;
5158         struct nfs4_state *state;
5159         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
5160         int status;
5161
5162         /* verify open state */
5163         ctx = nfs_file_open_context(filp);
5164         state = ctx->state;
5165
5166         if (request->fl_start < 0 || request->fl_end < 0)
5167                 return -EINVAL;
5168
5169         if (IS_GETLK(cmd)) {
5170                 if (state != NULL)
5171                         return nfs4_proc_getlk(state, F_GETLK, request);
5172                 return 0;
5173         }
5174
5175         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
5176                 return -EINVAL;
5177
5178         if (request->fl_type == F_UNLCK) {
5179                 if (state != NULL)
5180                         return nfs4_proc_unlck(state, cmd, request);
5181                 return 0;
5182         }
5183
5184         if (state == NULL)
5185                 return -ENOLCK;
5186         /*
5187          * Don't rely on the VFS having checked the file open mode,
5188          * since it won't do this for flock() locks.
5189          */
5190         switch (request->fl_type) {
5191         case F_RDLCK:
5192                 if (!(filp->f_mode & FMODE_READ))
5193                         return -EBADF;
5194                 break;
5195         case F_WRLCK:
5196                 if (!(filp->f_mode & FMODE_WRITE))
5197                         return -EBADF;
5198         }
5199
5200         do {
5201                 status = nfs4_proc_setlk(state, cmd, request);
5202                 if ((status != -EAGAIN) || IS_SETLK(cmd))
5203                         break;
5204                 timeout = nfs4_set_lock_task_retry(timeout);
5205                 status = -ERESTARTSYS;
5206                 if (signalled())
5207                         break;
5208         } while(status < 0);
5209         return status;
5210 }
5211
5212 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
5213 {
5214         struct nfs_server *server = NFS_SERVER(state->inode);
5215         int err;
5216
5217         err = nfs4_set_lock_state(state, fl);
5218         if (err != 0)
5219                 return err;
5220         err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
5221         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
5222 }
5223
5224 struct nfs_release_lockowner_data {
5225         struct nfs4_lock_state *lsp;
5226         struct nfs_server *server;
5227         struct nfs_release_lockowner_args args;
5228 };
5229
5230 static void nfs4_release_lockowner_release(void *calldata)
5231 {
5232         struct nfs_release_lockowner_data *data = calldata;
5233         nfs4_free_lock_state(data->server, data->lsp);
5234         kfree(calldata);
5235 }
5236
5237 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
5238         .rpc_release = nfs4_release_lockowner_release,
5239 };
5240
5241 static int nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
5242 {
5243         struct nfs_release_lockowner_data *data;
5244         struct rpc_message msg = {
5245                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
5246         };
5247
5248         if (server->nfs_client->cl_mvops->minor_version != 0)
5249                 return -EINVAL;
5250         data = kmalloc(sizeof(*data), GFP_NOFS);
5251         if (!data)
5252                 return -ENOMEM;
5253         data->lsp = lsp;
5254         data->server = server;
5255         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
5256         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
5257         data->args.lock_owner.s_dev = server->s_dev;
5258         msg.rpc_argp = &data->args;
5259         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
5260         return 0;
5261 }
5262
5263 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
5264
5265 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
5266                                    const void *buf, size_t buflen,
5267                                    int flags, int type)
5268 {
5269         if (strcmp(key, "") != 0)
5270                 return -EINVAL;
5271
5272         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
5273 }
5274
5275 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
5276                                    void *buf, size_t buflen, int type)
5277 {
5278         if (strcmp(key, "") != 0)
5279                 return -EINVAL;
5280
5281         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
5282 }
5283
5284 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
5285                                        size_t list_len, const char *name,
5286                                        size_t name_len, int type)
5287 {
5288         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
5289
5290         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
5291                 return 0;
5292
5293         if (list && len <= list_len)
5294                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
5295         return len;
5296 }
5297
5298 /*
5299  * nfs_fhget will use either the mounted_on_fileid or the fileid
5300  */
5301 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
5302 {
5303         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
5304                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
5305               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
5306               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
5307                 return;
5308
5309         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
5310                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
5311         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
5312         fattr->nlink = 2;
5313 }
5314
5315 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5316                                    const struct qstr *name,
5317                                    struct nfs4_fs_locations *fs_locations,
5318                                    struct page *page)
5319 {
5320         struct nfs_server *server = NFS_SERVER(dir);
5321         u32 bitmask[2] = {
5322                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
5323         };
5324         struct nfs4_fs_locations_arg args = {
5325                 .dir_fh = NFS_FH(dir),
5326                 .name = name,
5327                 .page = page,
5328                 .bitmask = bitmask,
5329         };
5330         struct nfs4_fs_locations_res res = {
5331                 .fs_locations = fs_locations,
5332         };
5333         struct rpc_message msg = {
5334                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
5335                 .rpc_argp = &args,
5336                 .rpc_resp = &res,
5337         };
5338         int status;
5339
5340         dprintk("%s: start\n", __func__);
5341
5342         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
5343          * is not supported */
5344         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
5345                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
5346         else
5347                 bitmask[0] |= FATTR4_WORD0_FILEID;
5348
5349         nfs_fattr_init(&fs_locations->fattr);
5350         fs_locations->server = server;
5351         fs_locations->nlocations = 0;
5352         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
5353         dprintk("%s: returned status = %d\n", __func__, status);
5354         return status;
5355 }
5356
5357 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5358                            const struct qstr *name,
5359                            struct nfs4_fs_locations *fs_locations,
5360                            struct page *page)
5361 {
5362         struct nfs4_exception exception = { };
5363         int err;
5364         do {
5365                 err = nfs4_handle_exception(NFS_SERVER(dir),
5366                                 _nfs4_proc_fs_locations(client, dir, name, fs_locations, page),
5367                                 &exception);
5368         } while (exception.retry);
5369         return err;
5370 }
5371
5372 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
5373 {
5374         int status;
5375         struct nfs4_secinfo_arg args = {
5376                 .dir_fh = NFS_FH(dir),
5377                 .name   = name,
5378         };
5379         struct nfs4_secinfo_res res = {
5380                 .flavors     = flavors,
5381         };
5382         struct rpc_message msg = {
5383                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
5384                 .rpc_argp = &args,
5385                 .rpc_resp = &res,
5386         };
5387
5388         dprintk("NFS call  secinfo %s\n", name->name);
5389         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
5390         dprintk("NFS reply  secinfo: %d\n", status);
5391         return status;
5392 }
5393
5394 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
5395                       struct nfs4_secinfo_flavors *flavors)
5396 {
5397         struct nfs4_exception exception = { };
5398         int err;
5399         do {
5400                 err = nfs4_handle_exception(NFS_SERVER(dir),
5401                                 _nfs4_proc_secinfo(dir, name, flavors),
5402                                 &exception);
5403         } while (exception.retry);
5404         return err;
5405 }
5406
5407 #ifdef CONFIG_NFS_V4_1
5408 /*
5409  * Check the exchange flags returned by the server for invalid flags, having
5410  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
5411  * DS flags set.
5412  */
5413 static int nfs4_check_cl_exchange_flags(u32 flags)
5414 {
5415         if (flags & ~EXCHGID4_FLAG_MASK_R)
5416                 goto out_inval;
5417         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
5418             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
5419                 goto out_inval;
5420         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
5421                 goto out_inval;
5422         return NFS_OK;
5423 out_inval:
5424         return -NFS4ERR_INVAL;
5425 }
5426
5427 static bool
5428 nfs41_same_server_scope(struct nfs41_server_scope *a,
5429                         struct nfs41_server_scope *b)
5430 {
5431         if (a->server_scope_sz == b->server_scope_sz &&
5432             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
5433                 return true;
5434
5435         return false;
5436 }
5437
5438 /*
5439  * nfs4_proc_bind_conn_to_session()
5440  *
5441  * The 4.1 client currently uses the same TCP connection for the
5442  * fore and backchannel.
5443  */
5444 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
5445 {
5446         int status;
5447         struct nfs41_bind_conn_to_session_res res;
5448         struct rpc_message msg = {
5449                 .rpc_proc =
5450                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
5451                 .rpc_argp = clp,
5452                 .rpc_resp = &res,
5453                 .rpc_cred = cred,
5454         };
5455
5456         dprintk("--> %s\n", __func__);
5457
5458         res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5459         if (unlikely(res.session == NULL)) {
5460                 status = -ENOMEM;
5461                 goto out;
5462         }
5463
5464         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5465         if (status == 0) {
5466                 if (memcmp(res.session->sess_id.data,
5467                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
5468                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
5469                         status = -EIO;
5470                         goto out_session;
5471                 }
5472                 if (res.dir != NFS4_CDFS4_BOTH) {
5473                         dprintk("NFS: %s: Unexpected direction from server\n",
5474                                 __func__);
5475                         status = -EIO;
5476                         goto out_session;
5477                 }
5478                 if (res.use_conn_in_rdma_mode) {
5479                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
5480                                 __func__);
5481                         status = -EIO;
5482                         goto out_session;
5483                 }
5484         }
5485 out_session:
5486         kfree(res.session);
5487 out:
5488         dprintk("<-- %s status= %d\n", __func__, status);
5489         return status;
5490 }
5491
5492 /*
5493  * nfs4_proc_exchange_id()
5494  *
5495  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5496  *
5497  * Since the clientid has expired, all compounds using sessions
5498  * associated with the stale clientid will be returning
5499  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
5500  * be in some phase of session reset.
5501  */
5502 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
5503 {
5504         nfs4_verifier verifier;
5505         struct nfs41_exchange_id_args args = {
5506                 .verifier = &verifier,
5507                 .client = clp,
5508                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
5509         };
5510         struct nfs41_exchange_id_res res = {
5511                 0
5512         };
5513         int status;
5514         struct rpc_message msg = {
5515                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
5516                 .rpc_argp = &args,
5517                 .rpc_resp = &res,
5518                 .rpc_cred = cred,
5519         };
5520
5521         nfs4_init_boot_verifier(clp, &verifier);
5522         args.id_len = nfs4_init_uniform_client_string(clp, args.id,
5523                                                         sizeof(args.id));
5524         dprintk("NFS call  exchange_id auth=%s, '%.*s'\n",
5525                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5526                 args.id_len, args.id);
5527
5528         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
5529                                         GFP_NOFS);
5530         if (unlikely(res.server_owner == NULL)) {
5531                 status = -ENOMEM;
5532                 goto out;
5533         }
5534
5535         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
5536                                         GFP_NOFS);
5537         if (unlikely(res.server_scope == NULL)) {
5538                 status = -ENOMEM;
5539                 goto out_server_owner;
5540         }
5541
5542         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
5543         if (unlikely(res.impl_id == NULL)) {
5544                 status = -ENOMEM;
5545                 goto out_server_scope;
5546         }
5547
5548         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5549         if (status == 0)
5550                 status = nfs4_check_cl_exchange_flags(res.flags);
5551
5552         if (status == 0) {
5553                 clp->cl_clientid = res.clientid;
5554                 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
5555                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
5556                         clp->cl_seqid = res.seqid;
5557
5558                 kfree(clp->cl_serverowner);
5559                 clp->cl_serverowner = res.server_owner;
5560                 res.server_owner = NULL;
5561
5562                 /* use the most recent implementation id */
5563                 kfree(clp->cl_implid);
5564                 clp->cl_implid = res.impl_id;
5565
5566                 if (clp->cl_serverscope != NULL &&
5567                     !nfs41_same_server_scope(clp->cl_serverscope,
5568                                              res.server_scope)) {
5569                         dprintk("%s: server_scope mismatch detected\n",
5570                                 __func__);
5571                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
5572                         kfree(clp->cl_serverscope);
5573                         clp->cl_serverscope = NULL;
5574                 }
5575
5576                 if (clp->cl_serverscope == NULL) {
5577                         clp->cl_serverscope = res.server_scope;
5578                         goto out;
5579                 }
5580         } else
5581                 kfree(res.impl_id);
5582
5583 out_server_owner:
5584         kfree(res.server_owner);
5585 out_server_scope:
5586         kfree(res.server_scope);
5587 out:
5588         if (clp->cl_implid != NULL)
5589                 dprintk("NFS reply exchange_id: Server Implementation ID: "
5590                         "domain: %s, name: %s, date: %llu,%u\n",
5591                         clp->cl_implid->domain, clp->cl_implid->name,
5592                         clp->cl_implid->date.seconds,
5593                         clp->cl_implid->date.nseconds);
5594         dprintk("NFS reply exchange_id: %d\n", status);
5595         return status;
5596 }
5597
5598 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
5599                 struct rpc_cred *cred)
5600 {
5601         struct rpc_message msg = {
5602                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
5603                 .rpc_argp = clp,
5604                 .rpc_cred = cred,
5605         };
5606         int status;
5607
5608         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5609         if (status)
5610                 dprintk("NFS: Got error %d from the server %s on "
5611                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
5612         return status;
5613 }
5614
5615 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
5616                 struct rpc_cred *cred)
5617 {
5618         unsigned int loop;
5619         int ret;
5620
5621         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
5622                 ret = _nfs4_proc_destroy_clientid(clp, cred);
5623                 switch (ret) {
5624                 case -NFS4ERR_DELAY:
5625                 case -NFS4ERR_CLIENTID_BUSY:
5626                         ssleep(1);
5627                         break;
5628                 default:
5629                         return ret;
5630                 }
5631         }
5632         return 0;
5633 }
5634
5635 int nfs4_destroy_clientid(struct nfs_client *clp)
5636 {
5637         struct rpc_cred *cred;
5638         int ret = 0;
5639
5640         if (clp->cl_mvops->minor_version < 1)
5641                 goto out;
5642         if (clp->cl_exchange_flags == 0)
5643                 goto out;
5644         if (clp->cl_preserve_clid)
5645                 goto out;
5646         cred = nfs4_get_exchange_id_cred(clp);
5647         ret = nfs4_proc_destroy_clientid(clp, cred);
5648         if (cred)
5649                 put_rpccred(cred);
5650         switch (ret) {
5651         case 0:
5652         case -NFS4ERR_STALE_CLIENTID:
5653                 clp->cl_exchange_flags = 0;
5654         }
5655 out:
5656         return ret;
5657 }
5658
5659 struct nfs4_get_lease_time_data {
5660         struct nfs4_get_lease_time_args *args;
5661         struct nfs4_get_lease_time_res *res;
5662         struct nfs_client *clp;
5663 };
5664
5665 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
5666                                         void *calldata)
5667 {
5668         struct nfs4_get_lease_time_data *data =
5669                         (struct nfs4_get_lease_time_data *)calldata;
5670
5671         dprintk("--> %s\n", __func__);
5672         /* just setup sequence, do not trigger session recovery
5673            since we're invoked within one */
5674         nfs41_setup_sequence(data->clp->cl_session,
5675                         &data->args->la_seq_args,
5676                         &data->res->lr_seq_res,
5677                         task);
5678         dprintk("<-- %s\n", __func__);
5679 }
5680
5681 /*
5682  * Called from nfs4_state_manager thread for session setup, so don't recover
5683  * from sequence operation or clientid errors.
5684  */
5685 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
5686 {
5687         struct nfs4_get_lease_time_data *data =
5688                         (struct nfs4_get_lease_time_data *)calldata;
5689
5690         dprintk("--> %s\n", __func__);
5691         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
5692                 return;
5693         switch (task->tk_status) {
5694         case -NFS4ERR_DELAY:
5695         case -NFS4ERR_GRACE:
5696                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
5697                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
5698                 task->tk_status = 0;
5699                 /* fall through */
5700         case -NFS4ERR_RETRY_UNCACHED_REP:
5701                 rpc_restart_call_prepare(task);
5702                 return;
5703         }
5704         dprintk("<-- %s\n", __func__);
5705 }
5706
5707 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
5708         .rpc_call_prepare = nfs4_get_lease_time_prepare,
5709         .rpc_call_done = nfs4_get_lease_time_done,
5710 };
5711
5712 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
5713 {
5714         struct rpc_task *task;
5715         struct nfs4_get_lease_time_args args;
5716         struct nfs4_get_lease_time_res res = {
5717                 .lr_fsinfo = fsinfo,
5718         };
5719         struct nfs4_get_lease_time_data data = {
5720                 .args = &args,
5721                 .res = &res,
5722                 .clp = clp,
5723         };
5724         struct rpc_message msg = {
5725                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
5726                 .rpc_argp = &args,
5727                 .rpc_resp = &res,
5728         };
5729         struct rpc_task_setup task_setup = {
5730                 .rpc_client = clp->cl_rpcclient,
5731                 .rpc_message = &msg,
5732                 .callback_ops = &nfs4_get_lease_time_ops,
5733                 .callback_data = &data,
5734                 .flags = RPC_TASK_TIMEOUT,
5735         };
5736         int status;
5737
5738         nfs41_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
5739         nfs4_set_sequence_privileged(&args.la_seq_args);
5740         dprintk("--> %s\n", __func__);
5741         task = rpc_run_task(&task_setup);
5742
5743         if (IS_ERR(task))
5744                 status = PTR_ERR(task);
5745         else {
5746                 status = task->tk_status;
5747                 rpc_put_task(task);
5748         }
5749         dprintk("<-- %s return %d\n", __func__, status);
5750
5751         return status;
5752 }
5753
5754 /*
5755  * Initialize the values to be used by the client in CREATE_SESSION
5756  * If nfs4_init_session set the fore channel request and response sizes,
5757  * use them.
5758  *
5759  * Set the back channel max_resp_sz_cached to zero to force the client to
5760  * always set csa_cachethis to FALSE because the current implementation
5761  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5762  */
5763 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5764 {
5765         struct nfs4_session *session = args->client->cl_session;
5766         unsigned int mxrqst_sz = session->fc_target_max_rqst_sz,
5767                      mxresp_sz = session->fc_target_max_resp_sz;
5768
5769         if (mxrqst_sz == 0)
5770                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5771         if (mxresp_sz == 0)
5772                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5773         /* Fore channel attributes */
5774         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5775         args->fc_attrs.max_resp_sz = mxresp_sz;
5776         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5777         args->fc_attrs.max_reqs = max_session_slots;
5778
5779         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5780                 "max_ops=%u max_reqs=%u\n",
5781                 __func__,
5782                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5783                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5784
5785         /* Back channel attributes */
5786         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5787         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5788         args->bc_attrs.max_resp_sz_cached = 0;
5789         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5790         args->bc_attrs.max_reqs = 1;
5791
5792         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5793                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5794                 __func__,
5795                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5796                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5797                 args->bc_attrs.max_reqs);
5798 }
5799
5800 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5801 {
5802         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5803         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5804
5805         if (rcvd->max_resp_sz > sent->max_resp_sz)
5806                 return -EINVAL;
5807         /*
5808          * Our requested max_ops is the minimum we need; we're not
5809          * prepared to break up compounds into smaller pieces than that.
5810          * So, no point even trying to continue if the server won't
5811          * cooperate:
5812          */
5813         if (rcvd->max_ops < sent->max_ops)
5814                 return -EINVAL;
5815         if (rcvd->max_reqs == 0)
5816                 return -EINVAL;
5817         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
5818                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
5819         return 0;
5820 }
5821
5822 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5823 {
5824         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5825         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5826
5827         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5828                 return -EINVAL;
5829         if (rcvd->max_resp_sz < sent->max_resp_sz)
5830                 return -EINVAL;
5831         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5832                 return -EINVAL;
5833         /* These would render the backchannel useless: */
5834         if (rcvd->max_ops != sent->max_ops)
5835                 return -EINVAL;
5836         if (rcvd->max_reqs != sent->max_reqs)
5837                 return -EINVAL;
5838         return 0;
5839 }
5840
5841 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5842                                      struct nfs4_session *session)
5843 {
5844         int ret;
5845
5846         ret = nfs4_verify_fore_channel_attrs(args, session);
5847         if (ret)
5848                 return ret;
5849         return nfs4_verify_back_channel_attrs(args, session);
5850 }
5851
5852 static int _nfs4_proc_create_session(struct nfs_client *clp,
5853                 struct rpc_cred *cred)
5854 {
5855         struct nfs4_session *session = clp->cl_session;
5856         struct nfs41_create_session_args args = {
5857                 .client = clp,
5858                 .cb_program = NFS4_CALLBACK,
5859         };
5860         struct nfs41_create_session_res res = {
5861                 .client = clp,
5862         };
5863         struct rpc_message msg = {
5864                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5865                 .rpc_argp = &args,
5866                 .rpc_resp = &res,
5867                 .rpc_cred = cred,
5868         };
5869         int status;
5870
5871         nfs4_init_channel_attrs(&args);
5872         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5873
5874         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5875
5876         if (!status) {
5877                 /* Verify the session's negotiated channel_attrs values */
5878                 status = nfs4_verify_channel_attrs(&args, session);
5879                 /* Increment the clientid slot sequence id */
5880                 clp->cl_seqid++;
5881         }
5882
5883         return status;
5884 }
5885
5886 /*
5887  * Issues a CREATE_SESSION operation to the server.
5888  * It is the responsibility of the caller to verify the session is
5889  * expired before calling this routine.
5890  */
5891 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
5892 {
5893         int status;
5894         unsigned *ptr;
5895         struct nfs4_session *session = clp->cl_session;
5896
5897         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5898
5899         status = _nfs4_proc_create_session(clp, cred);
5900         if (status)
5901                 goto out;
5902
5903         /* Init or reset the session slot tables */
5904         status = nfs4_setup_session_slot_tables(session);
5905         dprintk("slot table setup returned %d\n", status);
5906         if (status)
5907                 goto out;
5908
5909         ptr = (unsigned *)&session->sess_id.data[0];
5910         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5911                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5912 out:
5913         dprintk("<-- %s\n", __func__);
5914         return status;
5915 }
5916
5917 /*
5918  * Issue the over-the-wire RPC DESTROY_SESSION.
5919  * The caller must serialize access to this routine.
5920  */
5921 int nfs4_proc_destroy_session(struct nfs4_session *session,
5922                 struct rpc_cred *cred)
5923 {
5924         struct rpc_message msg = {
5925                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
5926                 .rpc_argp = session,
5927                 .rpc_cred = cred,
5928         };
5929         int status = 0;
5930
5931         dprintk("--> nfs4_proc_destroy_session\n");
5932
5933         /* session is still being setup */
5934         if (session->clp->cl_cons_state != NFS_CS_READY)
5935                 return status;
5936
5937         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5938
5939         if (status)
5940                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
5941                         "Session has been destroyed regardless...\n", status);
5942
5943         dprintk("<-- nfs4_proc_destroy_session\n");
5944         return status;
5945 }
5946
5947 /*
5948  * Renew the cl_session lease.
5949  */
5950 struct nfs4_sequence_data {
5951         struct nfs_client *clp;
5952         struct nfs4_sequence_args args;
5953         struct nfs4_sequence_res res;
5954 };
5955
5956 static void nfs41_sequence_release(void *data)
5957 {
5958         struct nfs4_sequence_data *calldata = data;
5959         struct nfs_client *clp = calldata->clp;
5960
5961         if (atomic_read(&clp->cl_count) > 1)
5962                 nfs4_schedule_state_renewal(clp);
5963         nfs_put_client(clp);
5964         kfree(calldata);
5965 }
5966
5967 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5968 {
5969         switch(task->tk_status) {
5970         case -NFS4ERR_DELAY:
5971                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5972                 return -EAGAIN;
5973         default:
5974                 nfs4_schedule_lease_recovery(clp);
5975         }
5976         return 0;
5977 }
5978
5979 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5980 {
5981         struct nfs4_sequence_data *calldata = data;
5982         struct nfs_client *clp = calldata->clp;
5983
5984         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5985                 return;
5986
5987         if (task->tk_status < 0) {
5988                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5989                 if (atomic_read(&clp->cl_count) == 1)
5990                         goto out;
5991
5992                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5993                         rpc_restart_call_prepare(task);
5994                         return;
5995                 }
5996         }
5997         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5998 out:
5999         dprintk("<-- %s\n", __func__);
6000 }
6001
6002 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
6003 {
6004         struct nfs4_sequence_data *calldata = data;
6005         struct nfs_client *clp = calldata->clp;
6006         struct nfs4_sequence_args *args;
6007         struct nfs4_sequence_res *res;
6008
6009         args = task->tk_msg.rpc_argp;
6010         res = task->tk_msg.rpc_resp;
6011
6012         nfs41_setup_sequence(clp->cl_session, args, res, task);
6013 }
6014
6015 static const struct rpc_call_ops nfs41_sequence_ops = {
6016         .rpc_call_done = nfs41_sequence_call_done,
6017         .rpc_call_prepare = nfs41_sequence_prepare,
6018         .rpc_release = nfs41_sequence_release,
6019 };
6020
6021 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
6022                 struct rpc_cred *cred,
6023                 bool is_privileged)
6024 {
6025         struct nfs4_sequence_data *calldata;
6026         struct rpc_message msg = {
6027                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
6028                 .rpc_cred = cred,
6029         };
6030         struct rpc_task_setup task_setup_data = {
6031                 .rpc_client = clp->cl_rpcclient,
6032                 .rpc_message = &msg,
6033                 .callback_ops = &nfs41_sequence_ops,
6034                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
6035         };
6036
6037         if (!atomic_inc_not_zero(&clp->cl_count))
6038                 return ERR_PTR(-EIO);
6039         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
6040         if (calldata == NULL) {
6041                 nfs_put_client(clp);
6042                 return ERR_PTR(-ENOMEM);
6043         }
6044         nfs41_init_sequence(&calldata->args, &calldata->res, 0);
6045         if (is_privileged)
6046                 nfs4_set_sequence_privileged(&calldata->args);
6047         msg.rpc_argp = &calldata->args;
6048         msg.rpc_resp = &calldata->res;
6049         calldata->clp = clp;
6050         task_setup_data.callback_data = calldata;
6051
6052         return rpc_run_task(&task_setup_data);
6053 }
6054
6055 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
6056 {
6057         struct rpc_task *task;
6058         int ret = 0;
6059
6060         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
6061                 return 0;
6062         task = _nfs41_proc_sequence(clp, cred, false);
6063         if (IS_ERR(task))
6064                 ret = PTR_ERR(task);
6065         else
6066                 rpc_put_task_async(task);
6067         dprintk("<-- %s status=%d\n", __func__, ret);
6068         return ret;
6069 }
6070
6071 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
6072 {
6073         struct rpc_task *task;
6074         int ret;
6075
6076         task = _nfs41_proc_sequence(clp, cred, true);
6077         if (IS_ERR(task)) {
6078                 ret = PTR_ERR(task);
6079                 goto out;
6080         }
6081         ret = rpc_wait_for_completion_task(task);
6082         if (!ret) {
6083                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
6084
6085                 if (task->tk_status == 0)
6086                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
6087                 ret = task->tk_status;
6088         }
6089         rpc_put_task(task);
6090 out:
6091         dprintk("<-- %s status=%d\n", __func__, ret);
6092         return ret;
6093 }
6094
6095 struct nfs4_reclaim_complete_data {
6096         struct nfs_client *clp;
6097         struct nfs41_reclaim_complete_args arg;
6098         struct nfs41_reclaim_complete_res res;
6099 };
6100
6101 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
6102 {
6103         struct nfs4_reclaim_complete_data *calldata = data;
6104
6105         nfs41_setup_sequence(calldata->clp->cl_session,
6106                         &calldata->arg.seq_args,
6107                         &calldata->res.seq_res,
6108                         task);
6109 }
6110
6111 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
6112 {
6113         switch(task->tk_status) {
6114         case 0:
6115         case -NFS4ERR_COMPLETE_ALREADY:
6116         case -NFS4ERR_WRONG_CRED: /* What to do here? */
6117                 break;
6118         case -NFS4ERR_DELAY:
6119                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
6120                 /* fall through */
6121         case -NFS4ERR_RETRY_UNCACHED_REP:
6122                 return -EAGAIN;
6123         default:
6124                 nfs4_schedule_lease_recovery(clp);
6125         }
6126         return 0;
6127 }
6128
6129 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
6130 {
6131         struct nfs4_reclaim_complete_data *calldata = data;
6132         struct nfs_client *clp = calldata->clp;
6133         struct nfs4_sequence_res *res = &calldata->res.seq_res;
6134
6135         dprintk("--> %s\n", __func__);
6136         if (!nfs41_sequence_done(task, res))
6137                 return;
6138
6139         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
6140                 rpc_restart_call_prepare(task);
6141                 return;
6142         }
6143         dprintk("<-- %s\n", __func__);
6144 }
6145
6146 static void nfs4_free_reclaim_complete_data(void *data)
6147 {
6148         struct nfs4_reclaim_complete_data *calldata = data;
6149
6150         kfree(calldata);
6151 }
6152
6153 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
6154         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
6155         .rpc_call_done = nfs4_reclaim_complete_done,
6156         .rpc_release = nfs4_free_reclaim_complete_data,
6157 };
6158
6159 /*
6160  * Issue a global reclaim complete.
6161  */
6162 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
6163 {
6164         struct nfs4_reclaim_complete_data *calldata;
6165         struct rpc_task *task;
6166         struct rpc_message msg = {
6167                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
6168         };
6169         struct rpc_task_setup task_setup_data = {
6170                 .rpc_client = clp->cl_rpcclient,
6171                 .rpc_message = &msg,
6172                 .callback_ops = &nfs4_reclaim_complete_call_ops,
6173                 .flags = RPC_TASK_ASYNC,
6174         };
6175         int status = -ENOMEM;
6176
6177         dprintk("--> %s\n", __func__);
6178         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
6179         if (calldata == NULL)
6180                 goto out;
6181         calldata->clp = clp;
6182         calldata->arg.one_fs = 0;
6183
6184         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
6185         nfs4_set_sequence_privileged(&calldata->arg.seq_args);
6186         msg.rpc_argp = &calldata->arg;
6187         msg.rpc_resp = &calldata->res;
6188         task_setup_data.callback_data = calldata;
6189         task = rpc_run_task(&task_setup_data);
6190         if (IS_ERR(task)) {
6191                 status = PTR_ERR(task);
6192                 goto out;
6193         }
6194         status = nfs4_wait_for_completion_rpc_task(task);
6195      &n