NFSv4: Record the OPEN create mode used in the nfs4_opendata structure
[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_SESSION_DRAINING, &session->session_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         int rpc_status;
773         int cancelled;
774 };
775
776 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
777                 int err, struct nfs4_exception *exception)
778 {
779         if (err != -EINVAL)
780                 return false;
781         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
782                 return false;
783         server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
784         exception->retry = 1;
785         return true;
786 }
787
788 static enum open_claim_type4
789 nfs4_map_atomic_open_claim(struct nfs_server *server,
790                 enum open_claim_type4 claim)
791 {
792         if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
793                 return claim;
794         switch (claim) {
795         default:
796                 return claim;
797         case NFS4_OPEN_CLAIM_FH:
798                 return NFS4_OPEN_CLAIM_NULL;
799         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
800                 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
801         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
802                 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
803         }
804 }
805
806 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
807 {
808         p->o_res.f_attr = &p->f_attr;
809         p->o_res.seqid = p->o_arg.seqid;
810         p->c_res.seqid = p->c_arg.seqid;
811         p->o_res.server = p->o_arg.server;
812         p->o_res.access_request = p->o_arg.access;
813         nfs_fattr_init(&p->f_attr);
814         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
815 }
816
817 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
818                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
819                 const struct iattr *attrs,
820                 enum open_claim_type4 claim,
821                 gfp_t gfp_mask)
822 {
823         struct dentry *parent = dget_parent(dentry);
824         struct inode *dir = parent->d_inode;
825         struct nfs_server *server = NFS_SERVER(dir);
826         struct nfs4_opendata *p;
827
828         p = kzalloc(sizeof(*p), gfp_mask);
829         if (p == NULL)
830                 goto err;
831         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
832         if (p->o_arg.seqid == NULL)
833                 goto err_free;
834         nfs_sb_active(dentry->d_sb);
835         p->dentry = dget(dentry);
836         p->dir = parent;
837         p->owner = sp;
838         atomic_inc(&sp->so_count);
839         p->o_arg.open_flags = flags;
840         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
841         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
842          * will return permission denied for all bits until close */
843         if (!(flags & O_EXCL)) {
844                 /* ask server to check for all possible rights as results
845                  * are cached */
846                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
847                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
848         }
849         p->o_arg.clientid = server->nfs_client->cl_clientid;
850         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
851         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
852         p->o_arg.name = &dentry->d_name;
853         p->o_arg.server = server;
854         p->o_arg.bitmask = server->attr_bitmask;
855         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
856         p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
857         switch (p->o_arg.claim) {
858         case NFS4_OPEN_CLAIM_NULL:
859         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
860         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
861                 p->o_arg.fh = NFS_FH(dir);
862                 break;
863         case NFS4_OPEN_CLAIM_PREVIOUS:
864         case NFS4_OPEN_CLAIM_FH:
865         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
866         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
867                 p->o_arg.fh = NFS_FH(dentry->d_inode);
868         }
869         if (attrs != NULL && attrs->ia_valid != 0) {
870                 __be32 verf[2];
871
872                 p->o_arg.u.attrs = &p->attrs;
873                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
874
875                 verf[0] = jiffies;
876                 verf[1] = current->pid;
877                 memcpy(p->o_arg.u.verifier.data, verf,
878                                 sizeof(p->o_arg.u.verifier.data));
879         }
880         p->c_arg.fh = &p->o_res.fh;
881         p->c_arg.stateid = &p->o_res.stateid;
882         p->c_arg.seqid = p->o_arg.seqid;
883         nfs4_init_opendata_res(p);
884         kref_init(&p->kref);
885         return p;
886 err_free:
887         kfree(p);
888 err:
889         dput(parent);
890         return NULL;
891 }
892
893 static void nfs4_opendata_free(struct kref *kref)
894 {
895         struct nfs4_opendata *p = container_of(kref,
896                         struct nfs4_opendata, kref);
897         struct super_block *sb = p->dentry->d_sb;
898
899         nfs_free_seqid(p->o_arg.seqid);
900         if (p->state != NULL)
901                 nfs4_put_open_state(p->state);
902         nfs4_put_state_owner(p->owner);
903         dput(p->dir);
904         dput(p->dentry);
905         nfs_sb_deactive(sb);
906         nfs_fattr_free_names(&p->f_attr);
907         kfree(p);
908 }
909
910 static void nfs4_opendata_put(struct nfs4_opendata *p)
911 {
912         if (p != NULL)
913                 kref_put(&p->kref, nfs4_opendata_free);
914 }
915
916 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
917 {
918         int ret;
919
920         ret = rpc_wait_for_completion_task(task);
921         return ret;
922 }
923
924 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
925 {
926         int ret = 0;
927
928         if (open_mode & (O_EXCL|O_TRUNC))
929                 goto out;
930         switch (mode & (FMODE_READ|FMODE_WRITE)) {
931                 case FMODE_READ:
932                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
933                                 && state->n_rdonly != 0;
934                         break;
935                 case FMODE_WRITE:
936                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
937                                 && state->n_wronly != 0;
938                         break;
939                 case FMODE_READ|FMODE_WRITE:
940                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
941                                 && state->n_rdwr != 0;
942         }
943 out:
944         return ret;
945 }
946
947 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
948 {
949         if (delegation == NULL)
950                 return 0;
951         if ((delegation->type & fmode) != fmode)
952                 return 0;
953         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
954                 return 0;
955         if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
956                 return 0;
957         nfs_mark_delegation_referenced(delegation);
958         return 1;
959 }
960
961 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
962 {
963         switch (fmode) {
964                 case FMODE_WRITE:
965                         state->n_wronly++;
966                         break;
967                 case FMODE_READ:
968                         state->n_rdonly++;
969                         break;
970                 case FMODE_READ|FMODE_WRITE:
971                         state->n_rdwr++;
972         }
973         nfs4_state_set_mode_locked(state, state->state | fmode);
974 }
975
976 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
977 {
978         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
979                 nfs4_stateid_copy(&state->stateid, stateid);
980         nfs4_stateid_copy(&state->open_stateid, stateid);
981         switch (fmode) {
982                 case FMODE_READ:
983                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
984                         break;
985                 case FMODE_WRITE:
986                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
987                         break;
988                 case FMODE_READ|FMODE_WRITE:
989                         set_bit(NFS_O_RDWR_STATE, &state->flags);
990         }
991 }
992
993 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
994 {
995         write_seqlock(&state->seqlock);
996         nfs_set_open_stateid_locked(state, stateid, fmode);
997         write_sequnlock(&state->seqlock);
998 }
999
1000 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
1001 {
1002         /*
1003          * Protect the call to nfs4_state_set_mode_locked and
1004          * serialise the stateid update
1005          */
1006         write_seqlock(&state->seqlock);
1007         if (deleg_stateid != NULL) {
1008                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1009                 set_bit(NFS_DELEGATED_STATE, &state->flags);
1010         }
1011         if (open_stateid != NULL)
1012                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
1013         write_sequnlock(&state->seqlock);
1014         spin_lock(&state->owner->so_lock);
1015         update_open_stateflags(state, fmode);
1016         spin_unlock(&state->owner->so_lock);
1017 }
1018
1019 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
1020 {
1021         struct nfs_inode *nfsi = NFS_I(state->inode);
1022         struct nfs_delegation *deleg_cur;
1023         int ret = 0;
1024
1025         fmode &= (FMODE_READ|FMODE_WRITE);
1026
1027         rcu_read_lock();
1028         deleg_cur = rcu_dereference(nfsi->delegation);
1029         if (deleg_cur == NULL)
1030                 goto no_delegation;
1031
1032         spin_lock(&deleg_cur->lock);
1033         if (nfsi->delegation != deleg_cur ||
1034            test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1035             (deleg_cur->type & fmode) != fmode)
1036                 goto no_delegation_unlock;
1037
1038         if (delegation == NULL)
1039                 delegation = &deleg_cur->stateid;
1040         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1041                 goto no_delegation_unlock;
1042
1043         nfs_mark_delegation_referenced(deleg_cur);
1044         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1045         ret = 1;
1046 no_delegation_unlock:
1047         spin_unlock(&deleg_cur->lock);
1048 no_delegation:
1049         rcu_read_unlock();
1050
1051         if (!ret && open_stateid != NULL) {
1052                 __update_open_stateid(state, open_stateid, NULL, fmode);
1053                 ret = 1;
1054         }
1055
1056         return ret;
1057 }
1058
1059
1060 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1061 {
1062         struct nfs_delegation *delegation;
1063
1064         rcu_read_lock();
1065         delegation = rcu_dereference(NFS_I(inode)->delegation);
1066         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1067                 rcu_read_unlock();
1068                 return;
1069         }
1070         rcu_read_unlock();
1071         nfs4_inode_return_delegation(inode);
1072 }
1073
1074 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1075 {
1076         struct nfs4_state *state = opendata->state;
1077         struct nfs_inode *nfsi = NFS_I(state->inode);
1078         struct nfs_delegation *delegation;
1079         int open_mode = opendata->o_arg.open_flags & (O_EXCL|O_TRUNC);
1080         fmode_t fmode = opendata->o_arg.fmode;
1081         nfs4_stateid stateid;
1082         int ret = -EAGAIN;
1083
1084         for (;;) {
1085                 if (can_open_cached(state, fmode, open_mode)) {
1086                         spin_lock(&state->owner->so_lock);
1087                         if (can_open_cached(state, fmode, open_mode)) {
1088                                 update_open_stateflags(state, fmode);
1089                                 spin_unlock(&state->owner->so_lock);
1090                                 goto out_return_state;
1091                         }
1092                         spin_unlock(&state->owner->so_lock);
1093                 }
1094                 rcu_read_lock();
1095                 delegation = rcu_dereference(nfsi->delegation);
1096                 if (!can_open_delegated(delegation, fmode)) {
1097                         rcu_read_unlock();
1098                         break;
1099                 }
1100                 /* Save the delegation */
1101                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1102                 rcu_read_unlock();
1103                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1104                 if (ret != 0)
1105                         goto out;
1106                 ret = -EAGAIN;
1107
1108                 /* Try to update the stateid using the delegation */
1109                 if (update_open_stateid(state, NULL, &stateid, fmode))
1110                         goto out_return_state;
1111         }
1112 out:
1113         return ERR_PTR(ret);
1114 out_return_state:
1115         atomic_inc(&state->count);
1116         return state;
1117 }
1118
1119 static void
1120 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1121 {
1122         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1123         struct nfs_delegation *delegation;
1124         int delegation_flags = 0;
1125
1126         rcu_read_lock();
1127         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1128         if (delegation)
1129                 delegation_flags = delegation->flags;
1130         rcu_read_unlock();
1131         if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1132                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1133                                    "returning a delegation for "
1134                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1135                                    clp->cl_hostname);
1136         } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1137                 nfs_inode_set_delegation(state->inode,
1138                                          data->owner->so_cred,
1139                                          &data->o_res);
1140         else
1141                 nfs_inode_reclaim_delegation(state->inode,
1142                                              data->owner->so_cred,
1143                                              &data->o_res);
1144 }
1145
1146 /*
1147  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1148  * and update the nfs4_state.
1149  */
1150 static struct nfs4_state *
1151 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1152 {
1153         struct inode *inode = data->state->inode;
1154         struct nfs4_state *state = data->state;
1155         int ret;
1156
1157         if (!data->rpc_done) {
1158                 ret = data->rpc_status;
1159                 goto err;
1160         }
1161
1162         ret = -ESTALE;
1163         if (!(data->f_attr.valid & NFS_ATTR_FATTR_TYPE) ||
1164             !(data->f_attr.valid & NFS_ATTR_FATTR_FILEID) ||
1165             !(data->f_attr.valid & NFS_ATTR_FATTR_CHANGE))
1166                 goto err;
1167
1168         ret = -ENOMEM;
1169         state = nfs4_get_open_state(inode, data->owner);
1170         if (state == NULL)
1171                 goto err;
1172
1173         ret = nfs_refresh_inode(inode, &data->f_attr);
1174         if (ret)
1175                 goto err;
1176
1177         if (data->o_res.delegation_type != 0)
1178                 nfs4_opendata_check_deleg(data, state);
1179         update_open_stateid(state, &data->o_res.stateid, NULL,
1180                             data->o_arg.fmode);
1181
1182         return state;
1183 err:
1184         return ERR_PTR(ret);
1185
1186 }
1187
1188 static struct nfs4_state *
1189 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1190 {
1191         struct inode *inode;
1192         struct nfs4_state *state = NULL;
1193         int ret;
1194
1195         if (!data->rpc_done) {
1196                 state = nfs4_try_open_cached(data);
1197                 goto out;
1198         }
1199
1200         ret = -EAGAIN;
1201         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1202                 goto err;
1203         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1204         ret = PTR_ERR(inode);
1205         if (IS_ERR(inode))
1206                 goto err;
1207         ret = -ENOMEM;
1208         state = nfs4_get_open_state(inode, data->owner);
1209         if (state == NULL)
1210                 goto err_put_inode;
1211         if (data->o_res.delegation_type != 0)
1212                 nfs4_opendata_check_deleg(data, state);
1213         update_open_stateid(state, &data->o_res.stateid, NULL,
1214                         data->o_arg.fmode);
1215         iput(inode);
1216 out:
1217         nfs_release_seqid(data->o_arg.seqid);
1218         return state;
1219 err_put_inode:
1220         iput(inode);
1221 err:
1222         return ERR_PTR(ret);
1223 }
1224
1225 static struct nfs4_state *
1226 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1227 {
1228         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1229                 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1230         return _nfs4_opendata_to_nfs4_state(data);
1231 }
1232
1233 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1234 {
1235         struct nfs_inode *nfsi = NFS_I(state->inode);
1236         struct nfs_open_context *ctx;
1237
1238         spin_lock(&state->inode->i_lock);
1239         list_for_each_entry(ctx, &nfsi->open_files, list) {
1240                 if (ctx->state != state)
1241                         continue;
1242                 get_nfs_open_context(ctx);
1243                 spin_unlock(&state->inode->i_lock);
1244                 return ctx;
1245         }
1246         spin_unlock(&state->inode->i_lock);
1247         return ERR_PTR(-ENOENT);
1248 }
1249
1250 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
1251                 struct nfs4_state *state, enum open_claim_type4 claim)
1252 {
1253         struct nfs4_opendata *opendata;
1254
1255         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
1256                         NULL, claim, GFP_NOFS);
1257         if (opendata == NULL)
1258                 return ERR_PTR(-ENOMEM);
1259         opendata->state = state;
1260         atomic_inc(&state->count);
1261         return opendata;
1262 }
1263
1264 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1265 {
1266         struct nfs4_state *newstate;
1267         int ret;
1268
1269         opendata->o_arg.open_flags = 0;
1270         opendata->o_arg.fmode = fmode;
1271         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1272         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1273         nfs4_init_opendata_res(opendata);
1274         ret = _nfs4_recover_proc_open(opendata);
1275         if (ret != 0)
1276                 return ret; 
1277         newstate = nfs4_opendata_to_nfs4_state(opendata);
1278         if (IS_ERR(newstate))
1279                 return PTR_ERR(newstate);
1280         nfs4_close_state(newstate, fmode);
1281         *res = newstate;
1282         return 0;
1283 }
1284
1285 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1286 {
1287         struct nfs4_state *newstate;
1288         int ret;
1289
1290         /* memory barrier prior to reading state->n_* */
1291         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1292         smp_rmb();
1293         if (state->n_rdwr != 0) {
1294                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1295                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1296                 if (ret != 0)
1297                         return ret;
1298                 if (newstate != state)
1299                         return -ESTALE;
1300         }
1301         if (state->n_wronly != 0) {
1302                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1303                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1304                 if (ret != 0)
1305                         return ret;
1306                 if (newstate != state)
1307                         return -ESTALE;
1308         }
1309         if (state->n_rdonly != 0) {
1310                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1311                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1312                 if (ret != 0)
1313                         return ret;
1314                 if (newstate != state)
1315                         return -ESTALE;
1316         }
1317         /*
1318          * We may have performed cached opens for all three recoveries.
1319          * Check if we need to update the current stateid.
1320          */
1321         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1322             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1323                 write_seqlock(&state->seqlock);
1324                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1325                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1326                 write_sequnlock(&state->seqlock);
1327         }
1328         return 0;
1329 }
1330
1331 /*
1332  * OPEN_RECLAIM:
1333  *      reclaim state on the server after a reboot.
1334  */
1335 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1336 {
1337         struct nfs_delegation *delegation;
1338         struct nfs4_opendata *opendata;
1339         fmode_t delegation_type = 0;
1340         int status;
1341
1342         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1343                         NFS4_OPEN_CLAIM_PREVIOUS);
1344         if (IS_ERR(opendata))
1345                 return PTR_ERR(opendata);
1346         rcu_read_lock();
1347         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1348         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1349                 delegation_type = delegation->type;
1350         rcu_read_unlock();
1351         opendata->o_arg.u.delegation_type = delegation_type;
1352         status = nfs4_open_recover(opendata, state);
1353         nfs4_opendata_put(opendata);
1354         return status;
1355 }
1356
1357 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1358 {
1359         struct nfs_server *server = NFS_SERVER(state->inode);
1360         struct nfs4_exception exception = { };
1361         int err;
1362         do {
1363                 err = _nfs4_do_open_reclaim(ctx, state);
1364                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1365                         continue;
1366                 if (err != -NFS4ERR_DELAY)
1367                         break;
1368                 nfs4_handle_exception(server, err, &exception);
1369         } while (exception.retry);
1370         return err;
1371 }
1372
1373 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1374 {
1375         struct nfs_open_context *ctx;
1376         int ret;
1377
1378         ctx = nfs4_state_find_open_context(state);
1379         if (IS_ERR(ctx))
1380                 return -EAGAIN;
1381         ret = nfs4_do_open_reclaim(ctx, state);
1382         put_nfs_open_context(ctx);
1383         return ret;
1384 }
1385
1386 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, int err)
1387 {
1388         switch (err) {
1389                 default:
1390                         printk(KERN_ERR "NFS: %s: unhandled error "
1391                                         "%d.\n", __func__, err);
1392                 case 0:
1393                 case -ENOENT:
1394                 case -ESTALE:
1395                         break;
1396                 case -NFS4ERR_BADSESSION:
1397                 case -NFS4ERR_BADSLOT:
1398                 case -NFS4ERR_BAD_HIGH_SLOT:
1399                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1400                 case -NFS4ERR_DEADSESSION:
1401                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1402                         nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1403                         return -EAGAIN;
1404                 case -NFS4ERR_STALE_CLIENTID:
1405                 case -NFS4ERR_STALE_STATEID:
1406                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1407                 case -NFS4ERR_EXPIRED:
1408                         /* Don't recall a delegation if it was lost */
1409                         nfs4_schedule_lease_recovery(server->nfs_client);
1410                         return -EAGAIN;
1411                 case -NFS4ERR_DELEG_REVOKED:
1412                 case -NFS4ERR_ADMIN_REVOKED:
1413                 case -NFS4ERR_BAD_STATEID:
1414                 case -NFS4ERR_OPENMODE:
1415                         nfs_inode_find_state_and_recover(state->inode,
1416                                         stateid);
1417                         nfs4_schedule_stateid_recovery(server, state);
1418                         return 0;
1419                 case -NFS4ERR_DELAY:
1420                 case -NFS4ERR_GRACE:
1421                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1422                         ssleep(1);
1423                         return -EAGAIN;
1424                 case -ENOMEM:
1425                 case -NFS4ERR_DENIED:
1426                         /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1427                         return 0;
1428         }
1429         return err;
1430 }
1431
1432 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1433 {
1434         struct nfs_server *server = NFS_SERVER(state->inode);
1435         struct nfs4_opendata *opendata;
1436         int err;
1437
1438         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1439                         NFS4_OPEN_CLAIM_DELEG_CUR_FH);
1440         if (IS_ERR(opendata))
1441                 return PTR_ERR(opendata);
1442         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1443         err = nfs4_open_recover(opendata, state);
1444         nfs4_opendata_put(opendata);
1445         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
1446 }
1447
1448 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1449 {
1450         struct nfs4_opendata *data = calldata;
1451
1452         data->rpc_status = task->tk_status;
1453         if (data->rpc_status == 0) {
1454                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1455                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1456                 renew_lease(data->o_res.server, data->timestamp);
1457                 data->rpc_done = 1;
1458         }
1459 }
1460
1461 static void nfs4_open_confirm_release(void *calldata)
1462 {
1463         struct nfs4_opendata *data = calldata;
1464         struct nfs4_state *state = NULL;
1465
1466         /* If this request hasn't been cancelled, do nothing */
1467         if (data->cancelled == 0)
1468                 goto out_free;
1469         /* In case of error, no cleanup! */
1470         if (!data->rpc_done)
1471                 goto out_free;
1472         state = nfs4_opendata_to_nfs4_state(data);
1473         if (!IS_ERR(state))
1474                 nfs4_close_state(state, data->o_arg.fmode);
1475 out_free:
1476         nfs4_opendata_put(data);
1477 }
1478
1479 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1480         .rpc_call_done = nfs4_open_confirm_done,
1481         .rpc_release = nfs4_open_confirm_release,
1482 };
1483
1484 /*
1485  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1486  */
1487 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1488 {
1489         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1490         struct rpc_task *task;
1491         struct  rpc_message msg = {
1492                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1493                 .rpc_argp = &data->c_arg,
1494                 .rpc_resp = &data->c_res,
1495                 .rpc_cred = data->owner->so_cred,
1496         };
1497         struct rpc_task_setup task_setup_data = {
1498                 .rpc_client = server->client,
1499                 .rpc_message = &msg,
1500                 .callback_ops = &nfs4_open_confirm_ops,
1501                 .callback_data = data,
1502                 .workqueue = nfsiod_workqueue,
1503                 .flags = RPC_TASK_ASYNC,
1504         };
1505         int status;
1506
1507         kref_get(&data->kref);
1508         data->rpc_done = 0;
1509         data->rpc_status = 0;
1510         data->timestamp = jiffies;
1511         task = rpc_run_task(&task_setup_data);
1512         if (IS_ERR(task))
1513                 return PTR_ERR(task);
1514         status = nfs4_wait_for_completion_rpc_task(task);
1515         if (status != 0) {
1516                 data->cancelled = 1;
1517                 smp_wmb();
1518         } else
1519                 status = data->rpc_status;
1520         rpc_put_task(task);
1521         return status;
1522 }
1523
1524 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1525 {
1526         struct nfs4_opendata *data = calldata;
1527         struct nfs4_state_owner *sp = data->owner;
1528         struct nfs_client *clp = sp->so_server->nfs_client;
1529
1530         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1531                 goto out_wait;
1532         /*
1533          * Check if we still need to send an OPEN call, or if we can use
1534          * a delegation instead.
1535          */
1536         if (data->state != NULL) {
1537                 struct nfs_delegation *delegation;
1538
1539                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1540                         goto out_no_action;
1541                 rcu_read_lock();
1542                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1543                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1544                     can_open_delegated(delegation, data->o_arg.fmode))
1545                         goto unlock_no_action;
1546                 rcu_read_unlock();
1547         }
1548         /* Update client id. */
1549         data->o_arg.clientid = clp->cl_clientid;
1550         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1551                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1552                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1553                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1554         }
1555         data->timestamp = jiffies;
1556         if (nfs4_setup_sequence(data->o_arg.server,
1557                                 &data->o_arg.seq_args,
1558                                 &data->o_res.seq_res,
1559                                 task) != 0)
1560                 nfs_release_seqid(data->o_arg.seqid);
1561
1562         /* Set the create mode (note dependency on the session type) */
1563         data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
1564         if (data->o_arg.open_flags & O_EXCL) {
1565                 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
1566                 if (nfs4_has_persistent_session(clp))
1567                         data->o_arg.createmode = NFS4_CREATE_GUARDED;
1568                 else if (clp->cl_mvops->minor_version > 0)
1569                         data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
1570         }
1571         return;
1572 unlock_no_action:
1573         rcu_read_unlock();
1574 out_no_action:
1575         task->tk_action = NULL;
1576 out_wait:
1577         nfs4_sequence_done(task, &data->o_res.seq_res);
1578 }
1579
1580 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1581 {
1582         struct nfs4_opendata *data = calldata;
1583
1584         data->rpc_status = task->tk_status;
1585
1586         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1587                 return;
1588
1589         if (task->tk_status == 0) {
1590                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1591                         switch (data->o_res.f_attr->mode & S_IFMT) {
1592                         case S_IFREG:
1593                                 break;
1594                         case S_IFLNK:
1595                                 data->rpc_status = -ELOOP;
1596                                 break;
1597                         case S_IFDIR:
1598                                 data->rpc_status = -EISDIR;
1599                                 break;
1600                         default:
1601                                 data->rpc_status = -ENOTDIR;
1602                         }
1603                 }
1604                 renew_lease(data->o_res.server, data->timestamp);
1605                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1606                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1607         }
1608         data->rpc_done = 1;
1609 }
1610
1611 static void nfs4_open_release(void *calldata)
1612 {
1613         struct nfs4_opendata *data = calldata;
1614         struct nfs4_state *state = NULL;
1615
1616         /* If this request hasn't been cancelled, do nothing */
1617         if (data->cancelled == 0)
1618                 goto out_free;
1619         /* In case of error, no cleanup! */
1620         if (data->rpc_status != 0 || !data->rpc_done)
1621                 goto out_free;
1622         /* In case we need an open_confirm, no cleanup! */
1623         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1624                 goto out_free;
1625         state = nfs4_opendata_to_nfs4_state(data);
1626         if (!IS_ERR(state))
1627                 nfs4_close_state(state, data->o_arg.fmode);
1628 out_free:
1629         nfs4_opendata_put(data);
1630 }
1631
1632 static const struct rpc_call_ops nfs4_open_ops = {
1633         .rpc_call_prepare = nfs4_open_prepare,
1634         .rpc_call_done = nfs4_open_done,
1635         .rpc_release = nfs4_open_release,
1636 };
1637
1638 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1639 {
1640         struct inode *dir = data->dir->d_inode;
1641         struct nfs_server *server = NFS_SERVER(dir);
1642         struct nfs_openargs *o_arg = &data->o_arg;
1643         struct nfs_openres *o_res = &data->o_res;
1644         struct rpc_task *task;
1645         struct rpc_message msg = {
1646                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1647                 .rpc_argp = o_arg,
1648                 .rpc_resp = o_res,
1649                 .rpc_cred = data->owner->so_cred,
1650         };
1651         struct rpc_task_setup task_setup_data = {
1652                 .rpc_client = server->client,
1653                 .rpc_message = &msg,
1654                 .callback_ops = &nfs4_open_ops,
1655                 .callback_data = data,
1656                 .workqueue = nfsiod_workqueue,
1657                 .flags = RPC_TASK_ASYNC,
1658         };
1659         int status;
1660
1661         nfs41_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1662         kref_get(&data->kref);
1663         data->rpc_done = 0;
1664         data->rpc_status = 0;
1665         data->cancelled = 0;
1666         if (isrecover)
1667                 nfs4_set_sequence_privileged(&o_arg->seq_args);
1668         task = rpc_run_task(&task_setup_data);
1669         if (IS_ERR(task))
1670                 return PTR_ERR(task);
1671         status = nfs4_wait_for_completion_rpc_task(task);
1672         if (status != 0) {
1673                 data->cancelled = 1;
1674                 smp_wmb();
1675         } else
1676                 status = data->rpc_status;
1677         rpc_put_task(task);
1678
1679         return status;
1680 }
1681
1682 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1683 {
1684         struct inode *dir = data->dir->d_inode;
1685         struct nfs_openres *o_res = &data->o_res;
1686         int status;
1687
1688         status = nfs4_run_open_task(data, 1);
1689         if (status != 0 || !data->rpc_done)
1690                 return status;
1691
1692         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1693
1694         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1695                 status = _nfs4_proc_open_confirm(data);
1696                 if (status != 0)
1697                         return status;
1698         }
1699
1700         return status;
1701 }
1702
1703 static int nfs4_opendata_access(struct rpc_cred *cred,
1704                                 struct nfs4_opendata *opendata,
1705                                 struct nfs4_state *state, fmode_t fmode,
1706                                 int openflags)
1707 {
1708         struct nfs_access_entry cache;
1709         u32 mask;
1710
1711         /* access call failed or for some reason the server doesn't
1712          * support any access modes -- defer access call until later */
1713         if (opendata->o_res.access_supported == 0)
1714                 return 0;
1715
1716         mask = 0;
1717         /* don't check MAY_WRITE - a newly created file may not have
1718          * write mode bits, but POSIX allows the creating process to write.
1719          * use openflags to check for exec, because fmode won't
1720          * always have FMODE_EXEC set when file open for exec. */
1721         if (openflags & __FMODE_EXEC) {
1722                 /* ONLY check for exec rights */
1723                 mask = MAY_EXEC;
1724         } else if (fmode & FMODE_READ)
1725                 mask = MAY_READ;
1726
1727         cache.cred = cred;
1728         cache.jiffies = jiffies;
1729         nfs_access_set_mask(&cache, opendata->o_res.access_result);
1730         nfs_access_add_cache(state->inode, &cache);
1731
1732         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
1733                 return 0;
1734
1735         /* even though OPEN succeeded, access is denied. Close the file */
1736         nfs4_close_state(state, fmode);
1737         return -EACCES;
1738 }
1739
1740 /*
1741  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1742  */
1743 static int _nfs4_proc_open(struct nfs4_opendata *data)
1744 {
1745         struct inode *dir = data->dir->d_inode;
1746         struct nfs_server *server = NFS_SERVER(dir);
1747         struct nfs_openargs *o_arg = &data->o_arg;
1748         struct nfs_openres *o_res = &data->o_res;
1749         int status;
1750
1751         status = nfs4_run_open_task(data, 0);
1752         if (!data->rpc_done)
1753                 return status;
1754         if (status != 0) {
1755                 if (status == -NFS4ERR_BADNAME &&
1756                                 !(o_arg->open_flags & O_CREAT))
1757                         return -ENOENT;
1758                 return status;
1759         }
1760
1761         nfs_fattr_map_and_free_names(server, &data->f_attr);
1762
1763         if (o_arg->open_flags & O_CREAT)
1764                 update_changeattr(dir, &o_res->cinfo);
1765         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1766                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1767         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1768                 status = _nfs4_proc_open_confirm(data);
1769                 if (status != 0)
1770                         return status;
1771         }
1772         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1773                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1774         return 0;
1775 }
1776
1777 static int nfs4_recover_expired_lease(struct nfs_server *server)
1778 {
1779         return nfs4_client_recover_expired_lease(server->nfs_client);
1780 }
1781
1782 /*
1783  * OPEN_EXPIRED:
1784  *      reclaim state on the server after a network partition.
1785  *      Assumes caller holds the appropriate lock
1786  */
1787 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1788 {
1789         struct nfs4_opendata *opendata;
1790         int ret;
1791
1792         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1793                         NFS4_OPEN_CLAIM_FH);
1794         if (IS_ERR(opendata))
1795                 return PTR_ERR(opendata);
1796         ret = nfs4_open_recover(opendata, state);
1797         if (ret == -ESTALE)
1798                 d_drop(ctx->dentry);
1799         nfs4_opendata_put(opendata);
1800         return ret;
1801 }
1802
1803 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1804 {
1805         struct nfs_server *server = NFS_SERVER(state->inode);
1806         struct nfs4_exception exception = { };
1807         int err;
1808
1809         do {
1810                 err = _nfs4_open_expired(ctx, state);
1811                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1812                         continue;
1813                 switch (err) {
1814                 default:
1815                         goto out;
1816                 case -NFS4ERR_GRACE:
1817                 case -NFS4ERR_DELAY:
1818                         nfs4_handle_exception(server, err, &exception);
1819                         err = 0;
1820                 }
1821         } while (exception.retry);
1822 out:
1823         return err;
1824 }
1825
1826 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1827 {
1828         struct nfs_open_context *ctx;
1829         int ret;
1830
1831         ctx = nfs4_state_find_open_context(state);
1832         if (IS_ERR(ctx))
1833                 return -EAGAIN;
1834         ret = nfs4_do_open_expired(ctx, state);
1835         put_nfs_open_context(ctx);
1836         return ret;
1837 }
1838
1839 #if defined(CONFIG_NFS_V4_1)
1840 static void nfs41_clear_delegation_stateid(struct nfs4_state *state)
1841 {
1842         struct nfs_server *server = NFS_SERVER(state->inode);
1843         nfs4_stateid *stateid = &state->stateid;
1844         int status;
1845
1846         /* If a state reset has been done, test_stateid is unneeded */
1847         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1848                 return;
1849
1850         status = nfs41_test_stateid(server, stateid);
1851         if (status != NFS_OK) {
1852                 /* Free the stateid unless the server explicitly
1853                  * informs us the stateid is unrecognized. */
1854                 if (status != -NFS4ERR_BAD_STATEID)
1855                         nfs41_free_stateid(server, stateid);
1856                 nfs_remove_bad_delegation(state->inode);
1857
1858                 write_seqlock(&state->seqlock);
1859                 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1860                 write_sequnlock(&state->seqlock);
1861                 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1862         }
1863 }
1864
1865 /**
1866  * nfs41_check_open_stateid - possibly free an open stateid
1867  *
1868  * @state: NFSv4 state for an inode
1869  *
1870  * Returns NFS_OK if recovery for this stateid is now finished.
1871  * Otherwise a negative NFS4ERR value is returned.
1872  */
1873 static int nfs41_check_open_stateid(struct nfs4_state *state)
1874 {
1875         struct nfs_server *server = NFS_SERVER(state->inode);
1876         nfs4_stateid *stateid = &state->open_stateid;
1877         int status;
1878
1879         /* If a state reset has been done, test_stateid is unneeded */
1880         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
1881             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
1882             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
1883                 return -NFS4ERR_BAD_STATEID;
1884
1885         status = nfs41_test_stateid(server, stateid);
1886         if (status != NFS_OK) {
1887                 /* Free the stateid unless the server explicitly
1888                  * informs us the stateid is unrecognized. */
1889                 if (status != -NFS4ERR_BAD_STATEID)
1890                         nfs41_free_stateid(server, stateid);
1891
1892                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1893                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1894                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1895         }
1896         return status;
1897 }
1898
1899 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1900 {
1901         int status;
1902
1903         nfs41_clear_delegation_stateid(state);
1904         status = nfs41_check_open_stateid(state);
1905         if (status != NFS_OK)
1906                 status = nfs4_open_expired(sp, state);
1907         return status;
1908 }
1909 #endif
1910
1911 /*
1912  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1913  * fields corresponding to attributes that were used to store the verifier.
1914  * Make sure we clobber those fields in the later setattr call
1915  */
1916 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1917 {
1918         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1919             !(sattr->ia_valid & ATTR_ATIME_SET))
1920                 sattr->ia_valid |= ATTR_ATIME;
1921
1922         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1923             !(sattr->ia_valid & ATTR_MTIME_SET))
1924                 sattr->ia_valid |= ATTR_MTIME;
1925 }
1926
1927 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
1928                 fmode_t fmode,
1929                 int flags,
1930                 struct nfs4_state **res)
1931 {
1932         struct nfs4_state_owner *sp = opendata->owner;
1933         struct nfs_server *server = sp->so_server;
1934         struct nfs4_state *state;
1935         unsigned int seq;
1936         int ret;
1937
1938         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
1939
1940         ret = _nfs4_proc_open(opendata);
1941         if (ret != 0)
1942                 goto out;
1943
1944         state = nfs4_opendata_to_nfs4_state(opendata);
1945         ret = PTR_ERR(state);
1946         if (IS_ERR(state))
1947                 goto out;
1948         if (server->caps & NFS_CAP_POSIX_LOCK)
1949                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1950
1951         ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
1952         if (ret != 0)
1953                 goto out;
1954
1955         if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
1956                 nfs4_schedule_stateid_recovery(server, state);
1957         *res = state;
1958 out:
1959         return ret;
1960 }
1961
1962 /*
1963  * Returns a referenced nfs4_state
1964  */
1965 static int _nfs4_do_open(struct inode *dir,
1966                         struct dentry *dentry,
1967                         fmode_t fmode,
1968                         int flags,
1969                         struct iattr *sattr,
1970                         struct rpc_cred *cred,
1971                         struct nfs4_state **res,
1972                         struct nfs4_threshold **ctx_th)
1973 {
1974         struct nfs4_state_owner  *sp;
1975         struct nfs4_state     *state = NULL;
1976         struct nfs_server       *server = NFS_SERVER(dir);
1977         struct nfs4_opendata *opendata;
1978         enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
1979         int status;
1980
1981         /* Protect against reboot recovery conflicts */
1982         status = -ENOMEM;
1983         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
1984         if (sp == NULL) {
1985                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1986                 goto out_err;
1987         }
1988         status = nfs4_recover_expired_lease(server);
1989         if (status != 0)
1990                 goto err_put_state_owner;
1991         if (dentry->d_inode != NULL)
1992                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
1993         status = -ENOMEM;
1994         if (dentry->d_inode)
1995                 claim = NFS4_OPEN_CLAIM_FH;
1996         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr,
1997                         claim, GFP_KERNEL);
1998         if (opendata == NULL)
1999                 goto err_put_state_owner;
2000
2001         if (ctx_th && server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
2002                 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
2003                 if (!opendata->f_attr.mdsthreshold)
2004                         goto err_opendata_put;
2005                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
2006         }
2007         if (dentry->d_inode != NULL)
2008                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
2009
2010         status = _nfs4_open_and_get_state(opendata, fmode, flags, &state);
2011         if (status != 0)
2012                 goto err_opendata_put;
2013
2014         if ((opendata->o_arg.open_flags & O_EXCL) &&
2015             (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
2016                 nfs4_exclusive_attrset(opendata, sattr);
2017
2018                 nfs_fattr_init(opendata->o_res.f_attr);
2019                 status = nfs4_do_setattr(state->inode, cred,
2020                                 opendata->o_res.f_attr, sattr,
2021                                 state);
2022                 if (status == 0)
2023                         nfs_setattr_update_inode(state->inode, sattr);
2024                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
2025         }
2026
2027         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server))
2028                 *ctx_th = opendata->f_attr.mdsthreshold;
2029         else
2030                 kfree(opendata->f_attr.mdsthreshold);
2031         opendata->f_attr.mdsthreshold = NULL;
2032
2033         nfs4_opendata_put(opendata);
2034         nfs4_put_state_owner(sp);
2035         *res = state;
2036         return 0;
2037 err_opendata_put:
2038         kfree(opendata->f_attr.mdsthreshold);
2039         nfs4_opendata_put(opendata);
2040 err_put_state_owner:
2041         nfs4_put_state_owner(sp);
2042 out_err:
2043         *res = NULL;
2044         return status;
2045 }
2046
2047
2048 static struct nfs4_state *nfs4_do_open(struct inode *dir,
2049                                         struct dentry *dentry,
2050                                         fmode_t fmode,
2051                                         int flags,
2052                                         struct iattr *sattr,
2053                                         struct rpc_cred *cred,
2054                                         struct nfs4_threshold **ctx_th)
2055 {
2056         struct nfs_server *server = NFS_SERVER(dir);
2057         struct nfs4_exception exception = { };
2058         struct nfs4_state *res;
2059         int status;
2060
2061         fmode &= FMODE_READ|FMODE_WRITE|FMODE_EXEC;
2062         do {
2063                 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred,
2064                                        &res, ctx_th);
2065                 if (status == 0)
2066                         break;
2067                 /* NOTE: BAD_SEQID means the server and client disagree about the
2068                  * book-keeping w.r.t. state-changing operations
2069                  * (OPEN/CLOSE/LOCK/LOCKU...)
2070                  * It is actually a sign of a bug on the client or on the server.
2071                  *
2072                  * If we receive a BAD_SEQID error in the particular case of
2073                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
2074                  * have unhashed the old state_owner for us, and that we can
2075                  * therefore safely retry using a new one. We should still warn
2076                  * the user though...
2077                  */
2078                 if (status == -NFS4ERR_BAD_SEQID) {
2079                         pr_warn_ratelimited("NFS: v4 server %s "
2080                                         " returned a bad sequence-id error!\n",
2081                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
2082                         exception.retry = 1;
2083                         continue;
2084                 }
2085                 /*
2086                  * BAD_STATEID on OPEN means that the server cancelled our
2087                  * state before it received the OPEN_CONFIRM.
2088                  * Recover by retrying the request as per the discussion
2089                  * on Page 181 of RFC3530.
2090                  */
2091                 if (status == -NFS4ERR_BAD_STATEID) {
2092                         exception.retry = 1;
2093                         continue;
2094                 }
2095                 if (status == -EAGAIN) {
2096                         /* We must have found a delegation */
2097                         exception.retry = 1;
2098                         continue;
2099                 }
2100                 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
2101                         continue;
2102                 res = ERR_PTR(nfs4_handle_exception(server,
2103                                         status, &exception));
2104         } while (exception.retry);
2105         return res;
2106 }
2107
2108 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2109                             struct nfs_fattr *fattr, struct iattr *sattr,
2110                             struct nfs4_state *state)
2111 {
2112         struct nfs_server *server = NFS_SERVER(inode);
2113         struct nfs_setattrargs  arg = {
2114                 .fh             = NFS_FH(inode),
2115                 .iap            = sattr,
2116                 .server         = server,
2117                 .bitmask = server->attr_bitmask,
2118         };
2119         struct nfs_setattrres  res = {
2120                 .fattr          = fattr,
2121                 .server         = server,
2122         };
2123         struct rpc_message msg = {
2124                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2125                 .rpc_argp       = &arg,
2126                 .rpc_resp       = &res,
2127                 .rpc_cred       = cred,
2128         };
2129         unsigned long timestamp = jiffies;
2130         int status;
2131
2132         nfs_fattr_init(fattr);
2133
2134         if (state != NULL && nfs4_valid_open_stateid(state)) {
2135                 struct nfs_lockowner lockowner = {
2136                         .l_owner = current->files,
2137                         .l_pid = current->tgid,
2138                 };
2139                 nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2140                                 &lockowner);
2141         } else if (nfs4_copy_delegation_stateid(&arg.stateid, inode,
2142                                 FMODE_WRITE)) {
2143                 /* Use that stateid */
2144         } else
2145                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2146
2147         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2148         if (status == 0 && state != NULL)
2149                 renew_lease(server, timestamp);
2150         return status;
2151 }
2152
2153 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2154                            struct nfs_fattr *fattr, struct iattr *sattr,
2155                            struct nfs4_state *state)
2156 {
2157         struct nfs_server *server = NFS_SERVER(inode);
2158         struct nfs4_exception exception = {
2159                 .state = state,
2160                 .inode = inode,
2161         };
2162         int err;
2163         do {
2164                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state);
2165                 switch (err) {
2166                 case -NFS4ERR_OPENMODE:
2167                         if (state && !(state->state & FMODE_WRITE)) {
2168                                 err = -EBADF;
2169                                 if (sattr->ia_valid & ATTR_OPEN)
2170                                         err = -EACCES;
2171                                 goto out;
2172                         }
2173                 }
2174                 err = nfs4_handle_exception(server, err, &exception);
2175         } while (exception.retry);
2176 out:
2177         return err;
2178 }
2179
2180 struct nfs4_closedata {
2181         struct inode *inode;
2182         struct nfs4_state *state;
2183         struct nfs_closeargs arg;
2184         struct nfs_closeres res;
2185         struct nfs_fattr fattr;
2186         unsigned long timestamp;
2187         bool roc;
2188         u32 roc_barrier;
2189 };
2190
2191 static void nfs4_free_closedata(void *data)
2192 {
2193         struct nfs4_closedata *calldata = data;
2194         struct nfs4_state_owner *sp = calldata->state->owner;
2195         struct super_block *sb = calldata->state->inode->i_sb;
2196
2197         if (calldata->roc)
2198                 pnfs_roc_release(calldata->state->inode);
2199         nfs4_put_open_state(calldata->state);
2200         nfs_free_seqid(calldata->arg.seqid);
2201         nfs4_put_state_owner(sp);
2202         nfs_sb_deactive(sb);
2203         kfree(calldata);
2204 }
2205
2206 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
2207                 fmode_t fmode)
2208 {
2209         spin_lock(&state->owner->so_lock);
2210         if (!(fmode & FMODE_READ))
2211                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2212         if (!(fmode & FMODE_WRITE))
2213                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2214         clear_bit(NFS_O_RDWR_STATE, &state->flags);
2215         spin_unlock(&state->owner->so_lock);
2216 }
2217
2218 static void nfs4_close_done(struct rpc_task *task, void *data)
2219 {
2220         struct nfs4_closedata *calldata = data;
2221         struct nfs4_state *state = calldata->state;
2222         struct nfs_server *server = NFS_SERVER(calldata->inode);
2223
2224         dprintk("%s: begin!\n", __func__);
2225         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2226                 return;
2227         /* hmm. we are done with the inode, and in the process of freeing
2228          * the state_owner. we keep this around to process errors
2229          */
2230         switch (task->tk_status) {
2231                 case 0:
2232                         if (calldata->roc)
2233                                 pnfs_roc_set_barrier(state->inode,
2234                                                      calldata->roc_barrier);
2235                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
2236                         renew_lease(server, calldata->timestamp);
2237                         nfs4_close_clear_stateid_flags(state,
2238                                         calldata->arg.fmode);
2239                         break;
2240                 case -NFS4ERR_STALE_STATEID:
2241                 case -NFS4ERR_OLD_STATEID:
2242                 case -NFS4ERR_BAD_STATEID:
2243                 case -NFS4ERR_EXPIRED:
2244                         if (calldata->arg.fmode == 0)
2245                                 break;
2246                 default:
2247                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
2248                                 rpc_restart_call_prepare(task);
2249         }
2250         nfs_release_seqid(calldata->arg.seqid);
2251         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2252         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2253 }
2254
2255 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2256 {
2257         struct nfs4_closedata *calldata = data;
2258         struct nfs4_state *state = calldata->state;
2259         struct inode *inode = calldata->inode;
2260         int call_close = 0;
2261
2262         dprintk("%s: begin!\n", __func__);
2263         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2264                 goto out_wait;
2265
2266         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2267         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2268         spin_lock(&state->owner->so_lock);
2269         /* Calculate the change in open mode */
2270         if (state->n_rdwr == 0) {
2271                 if (state->n_rdonly == 0) {
2272                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2273                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2274                         calldata->arg.fmode &= ~FMODE_READ;
2275                 }
2276                 if (state->n_wronly == 0) {
2277                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2278                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2279                         calldata->arg.fmode &= ~FMODE_WRITE;
2280                 }
2281         }
2282         if (!nfs4_valid_open_stateid(state))
2283                 call_close = 0;
2284         spin_unlock(&state->owner->so_lock);
2285
2286         if (!call_close) {
2287                 /* Note: exit _without_ calling nfs4_close_done */
2288                 goto out_no_action;
2289         }
2290
2291         if (calldata->arg.fmode == 0) {
2292                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2293                 if (calldata->roc &&
2294                     pnfs_roc_drain(inode, &calldata->roc_barrier, task)) {
2295                         nfs_release_seqid(calldata->arg.seqid);
2296                         goto out_wait;
2297                     }
2298         }
2299
2300         nfs_fattr_init(calldata->res.fattr);
2301         calldata->timestamp = jiffies;
2302         if (nfs4_setup_sequence(NFS_SERVER(inode),
2303                                 &calldata->arg.seq_args,
2304                                 &calldata->res.seq_res,
2305                                 task) != 0)
2306                 nfs_release_seqid(calldata->arg.seqid);
2307         dprintk("%s: done!\n", __func__);
2308         return;
2309 out_no_action:
2310         task->tk_action = NULL;
2311 out_wait:
2312         nfs4_sequence_done(task, &calldata->res.seq_res);
2313 }
2314
2315 static const struct rpc_call_ops nfs4_close_ops = {
2316         .rpc_call_prepare = nfs4_close_prepare,
2317         .rpc_call_done = nfs4_close_done,
2318         .rpc_release = nfs4_free_closedata,
2319 };
2320
2321 /* 
2322  * It is possible for data to be read/written from a mem-mapped file 
2323  * after the sys_close call (which hits the vfs layer as a flush).
2324  * This means that we can't safely call nfsv4 close on a file until 
2325  * the inode is cleared. This in turn means that we are not good
2326  * NFSv4 citizens - we do not indicate to the server to update the file's 
2327  * share state even when we are done with one of the three share 
2328  * stateid's in the inode.
2329  *
2330  * NOTE: Caller must be holding the sp->so_owner semaphore!
2331  */
2332 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2333 {
2334         struct nfs_server *server = NFS_SERVER(state->inode);
2335         struct nfs4_closedata *calldata;
2336         struct nfs4_state_owner *sp = state->owner;
2337         struct rpc_task *task;
2338         struct rpc_message msg = {
2339                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2340                 .rpc_cred = state->owner->so_cred,
2341         };
2342         struct rpc_task_setup task_setup_data = {
2343                 .rpc_client = server->client,
2344                 .rpc_message = &msg,
2345                 .callback_ops = &nfs4_close_ops,
2346                 .workqueue = nfsiod_workqueue,
2347                 .flags = RPC_TASK_ASYNC,
2348         };
2349         int status = -ENOMEM;
2350
2351         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2352         if (calldata == NULL)
2353                 goto out;
2354         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2355         calldata->inode = state->inode;
2356         calldata->state = state;
2357         calldata->arg.fh = NFS_FH(state->inode);
2358         calldata->arg.stateid = &state->open_stateid;
2359         /* Serialization for the sequence id */
2360         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2361         if (calldata->arg.seqid == NULL)
2362                 goto out_free_calldata;
2363         calldata->arg.fmode = 0;
2364         calldata->arg.bitmask = server->cache_consistency_bitmask;
2365         calldata->res.fattr = &calldata->fattr;
2366         calldata->res.seqid = calldata->arg.seqid;
2367         calldata->res.server = server;
2368         calldata->roc = pnfs_roc(state->inode);
2369         nfs_sb_active(calldata->inode->i_sb);
2370
2371         msg.rpc_argp = &calldata->arg;
2372         msg.rpc_resp = &calldata->res;
2373         task_setup_data.callback_data = calldata;
2374         task = rpc_run_task(&task_setup_data);
2375         if (IS_ERR(task))
2376                 return PTR_ERR(task);
2377         status = 0;
2378         if (wait)
2379                 status = rpc_wait_for_completion_task(task);
2380         rpc_put_task(task);
2381         return status;
2382 out_free_calldata:
2383         kfree(calldata);
2384 out:
2385         nfs4_put_open_state(state);
2386         nfs4_put_state_owner(sp);
2387         return status;
2388 }
2389
2390 static struct inode *
2391 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2392 {
2393         struct nfs4_state *state;
2394
2395         /* Protect against concurrent sillydeletes */
2396         state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr,
2397                              ctx->cred, &ctx->mdsthreshold);
2398         if (IS_ERR(state))
2399                 return ERR_CAST(state);
2400         ctx->state = state;
2401         return igrab(state->inode);
2402 }
2403
2404 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2405 {
2406         if (ctx->state == NULL)
2407                 return;
2408         if (is_sync)
2409                 nfs4_close_sync(ctx->state, ctx->mode);
2410         else
2411                 nfs4_close_state(ctx->state, ctx->mode);
2412 }
2413
2414 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2415 {
2416         struct nfs4_server_caps_arg args = {
2417                 .fhandle = fhandle,
2418         };
2419         struct nfs4_server_caps_res res = {};
2420         struct rpc_message msg = {
2421                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2422                 .rpc_argp = &args,
2423                 .rpc_resp = &res,
2424         };
2425         int status;
2426
2427         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2428         if (status == 0) {
2429                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2430                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2431                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2432                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2433                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2434                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2435                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2436                         server->caps |= NFS_CAP_ACLS;
2437                 if (res.has_links != 0)
2438                         server->caps |= NFS_CAP_HARDLINKS;
2439                 if (res.has_symlinks != 0)
2440                         server->caps |= NFS_CAP_SYMLINKS;
2441                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2442                         server->caps |= NFS_CAP_FILEID;
2443                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2444                         server->caps |= NFS_CAP_MODE;
2445                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2446                         server->caps |= NFS_CAP_NLINK;
2447                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2448                         server->caps |= NFS_CAP_OWNER;
2449                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2450                         server->caps |= NFS_CAP_OWNER_GROUP;
2451                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2452                         server->caps |= NFS_CAP_ATIME;
2453                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2454                         server->caps |= NFS_CAP_CTIME;
2455                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2456                         server->caps |= NFS_CAP_MTIME;
2457
2458                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2459                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2460                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2461                 server->acl_bitmask = res.acl_bitmask;
2462                 server->fh_expire_type = res.fh_expire_type;
2463         }
2464
2465         return status;
2466 }
2467
2468 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2469 {
2470         struct nfs4_exception exception = { };
2471         int err;
2472         do {
2473                 err = nfs4_handle_exception(server,
2474                                 _nfs4_server_capabilities(server, fhandle),
2475                                 &exception);
2476         } while (exception.retry);
2477         return err;
2478 }
2479
2480 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2481                 struct nfs_fsinfo *info)
2482 {
2483         struct nfs4_lookup_root_arg args = {
2484                 .bitmask = nfs4_fattr_bitmap,
2485         };
2486         struct nfs4_lookup_res res = {
2487                 .server = server,
2488                 .fattr = info->fattr,
2489                 .fh = fhandle,
2490         };
2491         struct rpc_message msg = {
2492                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2493                 .rpc_argp = &args,
2494                 .rpc_resp = &res,
2495         };
2496
2497         nfs_fattr_init(info->fattr);
2498         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2499 }
2500
2501 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2502                 struct nfs_fsinfo *info)
2503 {
2504         struct nfs4_exception exception = { };
2505         int err;
2506         do {
2507                 err = _nfs4_lookup_root(server, fhandle, info);
2508                 switch (err) {
2509                 case 0:
2510                 case -NFS4ERR_WRONGSEC:
2511                         goto out;
2512                 default:
2513                         err = nfs4_handle_exception(server, err, &exception);
2514                 }
2515         } while (exception.retry);
2516 out:
2517         return err;
2518 }
2519
2520 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2521                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2522 {
2523         struct rpc_auth *auth;
2524         int ret;
2525
2526         auth = rpcauth_create(flavor, server->client);
2527         if (IS_ERR(auth)) {
2528                 ret = -EIO;
2529                 goto out;
2530         }
2531         ret = nfs4_lookup_root(server, fhandle, info);
2532 out:
2533         return ret;
2534 }
2535
2536 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2537                               struct nfs_fsinfo *info)
2538 {
2539         int i, len, status = 0;
2540         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2541
2542         len = rpcauth_list_flavors(flav_array, ARRAY_SIZE(flav_array));
2543         if (len < 0)
2544                 return len;
2545
2546         for (i = 0; i < len; i++) {
2547                 /* AUTH_UNIX is the default flavor if none was specified,
2548                  * thus has already been tried. */
2549                 if (flav_array[i] == RPC_AUTH_UNIX)
2550                         continue;
2551
2552                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2553                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2554                         continue;
2555                 break;
2556         }
2557         /*
2558          * -EACCESS could mean that the user doesn't have correct permissions
2559          * to access the mount.  It could also mean that we tried to mount
2560          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2561          * existing mount programs don't handle -EACCES very well so it should
2562          * be mapped to -EPERM instead.
2563          */
2564         if (status == -EACCES)
2565                 status = -EPERM;
2566         return status;
2567 }
2568
2569 /*
2570  * get the file handle for the "/" directory on the server
2571  */
2572 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
2573                          struct nfs_fsinfo *info)
2574 {
2575         int minor_version = server->nfs_client->cl_minorversion;
2576         int status = nfs4_lookup_root(server, fhandle, info);
2577         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2578                 /*
2579                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2580                  * by nfs4_map_errors() as this function exits.
2581                  */
2582                 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2583         if (status == 0)
2584                 status = nfs4_server_capabilities(server, fhandle);
2585         if (status == 0)
2586                 status = nfs4_do_fsinfo(server, fhandle, info);
2587         return nfs4_map_errors(status);
2588 }
2589
2590 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
2591                               struct nfs_fsinfo *info)
2592 {
2593         int error;
2594         struct nfs_fattr *fattr = info->fattr;
2595
2596         error = nfs4_server_capabilities(server, mntfh);
2597         if (error < 0) {
2598                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
2599                 return error;
2600         }
2601
2602         error = nfs4_proc_getattr(server, mntfh, fattr);
2603         if (error < 0) {
2604                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
2605                 return error;
2606         }
2607
2608         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
2609             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
2610                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
2611
2612         return error;
2613 }
2614
2615 /*
2616  * Get locations and (maybe) other attributes of a referral.
2617  * Note that we'll actually follow the referral later when
2618  * we detect fsid mismatch in inode revalidation
2619  */
2620 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
2621                              const struct qstr *name, struct nfs_fattr *fattr,
2622                              struct nfs_fh *fhandle)
2623 {
2624         int status = -ENOMEM;
2625         struct page *page = NULL;
2626         struct nfs4_fs_locations *locations = NULL;
2627
2628         page = alloc_page(GFP_KERNEL);
2629         if (page == NULL)
2630                 goto out;
2631         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2632         if (locations == NULL)
2633                 goto out;
2634
2635         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
2636         if (status != 0)
2637                 goto out;
2638         /* Make sure server returned a different fsid for the referral */
2639         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2640                 dprintk("%s: server did not return a different fsid for"
2641                         " a referral at %s\n", __func__, name->name);
2642                 status = -EIO;
2643                 goto out;
2644         }
2645         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2646         nfs_fixup_referral_attributes(&locations->fattr);
2647
2648         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2649         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2650         memset(fhandle, 0, sizeof(struct nfs_fh));
2651 out:
2652         if (page)
2653                 __free_page(page);
2654         kfree(locations);
2655         return status;
2656 }
2657
2658 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2659 {
2660         struct nfs4_getattr_arg args = {
2661                 .fh = fhandle,
2662                 .bitmask = server->attr_bitmask,
2663         };
2664         struct nfs4_getattr_res res = {
2665                 .fattr = fattr,
2666                 .server = server,
2667         };
2668         struct rpc_message msg = {
2669                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2670                 .rpc_argp = &args,
2671                 .rpc_resp = &res,
2672         };
2673         
2674         nfs_fattr_init(fattr);
2675         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2676 }
2677
2678 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2679 {
2680         struct nfs4_exception exception = { };
2681         int err;
2682         do {
2683                 err = nfs4_handle_exception(server,
2684                                 _nfs4_proc_getattr(server, fhandle, fattr),
2685                                 &exception);
2686         } while (exception.retry);
2687         return err;
2688 }
2689
2690 /* 
2691  * The file is not closed if it is opened due to the a request to change
2692  * the size of the file. The open call will not be needed once the
2693  * VFS layer lookup-intents are implemented.
2694  *
2695  * Close is called when the inode is destroyed.
2696  * If we haven't opened the file for O_WRONLY, we
2697  * need to in the size_change case to obtain a stateid.
2698  *
2699  * Got race?
2700  * Because OPEN is always done by name in nfsv4, it is
2701  * possible that we opened a different file by the same
2702  * name.  We can recognize this race condition, but we
2703  * can't do anything about it besides returning an error.
2704  *
2705  * This will be fixed with VFS changes (lookup-intent).
2706  */
2707 static int
2708 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2709                   struct iattr *sattr)
2710 {
2711         struct inode *inode = dentry->d_inode;
2712         struct rpc_cred *cred = NULL;
2713         struct nfs4_state *state = NULL;
2714         int status;
2715
2716         if (pnfs_ld_layoutret_on_setattr(inode))
2717                 pnfs_commit_and_return_layout(inode);
2718
2719         nfs_fattr_init(fattr);
2720         
2721         /* Deal with open(O_TRUNC) */
2722         if (sattr->ia_valid & ATTR_OPEN)
2723                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME|ATTR_OPEN);
2724
2725         /* Optimization: if the end result is no change, don't RPC */
2726         if ((sattr->ia_valid & ~(ATTR_FILE)) == 0)
2727                 return 0;
2728
2729         /* Search for an existing open(O_WRITE) file */
2730         if (sattr->ia_valid & ATTR_FILE) {
2731                 struct nfs_open_context *ctx;
2732
2733                 ctx = nfs_file_open_context(sattr->ia_file);
2734                 if (ctx) {
2735                         cred = ctx->cred;
2736                         state = ctx->state;
2737                 }
2738         }
2739
2740         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2741         if (status == 0)
2742                 nfs_setattr_update_inode(inode, sattr);
2743         return status;
2744 }
2745
2746 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2747                 const struct qstr *name, struct nfs_fh *fhandle,
2748                 struct nfs_fattr *fattr)
2749 {
2750         struct nfs_server *server = NFS_SERVER(dir);
2751         int                    status;
2752         struct nfs4_lookup_arg args = {
2753                 .bitmask = server->attr_bitmask,
2754                 .dir_fh = NFS_FH(dir),
2755                 .name = name,
2756         };
2757         struct nfs4_lookup_res res = {
2758                 .server = server,
2759                 .fattr = fattr,
2760                 .fh = fhandle,
2761         };
2762         struct rpc_message msg = {
2763                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2764                 .rpc_argp = &args,
2765                 .rpc_resp = &res,
2766         };
2767
2768         nfs_fattr_init(fattr);
2769
2770         dprintk("NFS call  lookup %s\n", name->name);
2771         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2772         dprintk("NFS reply lookup: %d\n", status);
2773         return status;
2774 }
2775
2776 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
2777 {
2778         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2779                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
2780         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2781         fattr->nlink = 2;
2782 }
2783
2784 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
2785                                    struct qstr *name, struct nfs_fh *fhandle,
2786                                    struct nfs_fattr *fattr)
2787 {
2788         struct nfs4_exception exception = { };
2789         struct rpc_clnt *client = *clnt;
2790         int err;
2791         do {
2792                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr);
2793                 switch (err) {
2794                 case -NFS4ERR_BADNAME:
2795                         err = -ENOENT;
2796                         goto out;
2797                 case -NFS4ERR_MOVED:
2798                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
2799                         goto out;
2800                 case -NFS4ERR_WRONGSEC:
2801                         err = -EPERM;
2802                         if (client != *clnt)
2803                                 goto out;
2804
2805                         client = nfs4_create_sec_client(client, dir, name);
2806                         if (IS_ERR(client))
2807                                 return PTR_ERR(client);
2808
2809                         exception.retry = 1;
2810                         break;
2811                 default:
2812                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
2813                 }
2814         } while (exception.retry);
2815
2816 out:
2817         if (err == 0)
2818                 *clnt = client;
2819         else if (client != *clnt)
2820                 rpc_shutdown_client(client);
2821
2822         return err;
2823 }
2824
2825 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
2826                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2827 {
2828         int status;
2829         struct rpc_clnt *client = NFS_CLIENT(dir);
2830
2831         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2832         if (client != NFS_CLIENT(dir)) {
2833                 rpc_shutdown_client(client);
2834                 nfs_fixup_secinfo_attributes(fattr);
2835         }
2836         return status;
2837 }
2838
2839 struct rpc_clnt *
2840 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
2841                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2842 {
2843         int status;
2844         struct rpc_clnt *client = rpc_clone_client(NFS_CLIENT(dir));
2845
2846         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2847         if (status < 0) {
2848                 rpc_shutdown_client(client);
2849                 return ERR_PTR(status);
2850         }
2851         return client;
2852 }
2853
2854 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2855 {
2856         struct nfs_server *server = NFS_SERVER(inode);
2857         struct nfs4_accessargs args = {
2858                 .fh = NFS_FH(inode),
2859                 .bitmask = server->cache_consistency_bitmask,
2860         };
2861         struct nfs4_accessres res = {
2862                 .server = server,
2863         };
2864         struct rpc_message msg = {
2865                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2866                 .rpc_argp = &args,
2867                 .rpc_resp = &res,
2868                 .rpc_cred = entry->cred,
2869         };
2870         int mode = entry->mask;
2871         int status;
2872
2873         /*
2874          * Determine which access bits we want to ask for...
2875          */
2876         if (mode & MAY_READ)
2877                 args.access |= NFS4_ACCESS_READ;
2878         if (S_ISDIR(inode->i_mode)) {
2879                 if (mode & MAY_WRITE)
2880                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2881                 if (mode & MAY_EXEC)
2882                         args.access |= NFS4_ACCESS_LOOKUP;
2883         } else {
2884                 if (mode & MAY_WRITE)
2885                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2886                 if (mode & MAY_EXEC)
2887                         args.access |= NFS4_ACCESS_EXECUTE;
2888         }
2889
2890         res.fattr = nfs_alloc_fattr();
2891         if (res.fattr == NULL)
2892                 return -ENOMEM;
2893
2894         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2895         if (!status) {
2896                 nfs_access_set_mask(entry, res.access);
2897                 nfs_refresh_inode(inode, res.fattr);
2898         }
2899         nfs_free_fattr(res.fattr);
2900         return status;
2901 }
2902
2903 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2904 {
2905         struct nfs4_exception exception = { };
2906         int err;
2907         do {
2908                 err = nfs4_handle_exception(NFS_SERVER(inode),
2909                                 _nfs4_proc_access(inode, entry),
2910                                 &exception);
2911         } while (exception.retry);
2912         return err;
2913 }
2914
2915 /*
2916  * TODO: For the time being, we don't try to get any attributes
2917  * along with any of the zero-copy operations READ, READDIR,
2918  * READLINK, WRITE.
2919  *
2920  * In the case of the first three, we want to put the GETATTR
2921  * after the read-type operation -- this is because it is hard
2922  * to predict the length of a GETATTR response in v4, and thus
2923  * align the READ data correctly.  This means that the GETATTR
2924  * may end up partially falling into the page cache, and we should
2925  * shift it into the 'tail' of the xdr_buf before processing.
2926  * To do this efficiently, we need to know the total length
2927  * of data received, which doesn't seem to be available outside
2928  * of the RPC layer.
2929  *
2930  * In the case of WRITE, we also want to put the GETATTR after
2931  * the operation -- in this case because we want to make sure
2932  * we get the post-operation mtime and size.
2933  *
2934  * Both of these changes to the XDR layer would in fact be quite
2935  * minor, but I decided to leave them for a subsequent patch.
2936  */
2937 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2938                 unsigned int pgbase, unsigned int pglen)
2939 {
2940         struct nfs4_readlink args = {
2941                 .fh       = NFS_FH(inode),
2942                 .pgbase   = pgbase,
2943                 .pglen    = pglen,
2944                 .pages    = &page,
2945         };
2946         struct nfs4_readlink_res res;
2947         struct rpc_message msg = {
2948                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2949                 .rpc_argp = &args,
2950                 .rpc_resp = &res,
2951         };
2952
2953         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2954 }
2955
2956 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2957                 unsigned int pgbase, unsigned int pglen)
2958 {
2959         struct nfs4_exception exception = { };
2960         int err;
2961         do {
2962                 err = nfs4_handle_exception(NFS_SERVER(inode),
2963                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2964                                 &exception);
2965         } while (exception.retry);
2966         return err;
2967 }
2968
2969 /*
2970  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
2971  */
2972 static int
2973 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2974                  int flags)
2975 {
2976         struct nfs_open_context *ctx;
2977         struct nfs4_state *state;
2978         int status = 0;
2979
2980         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
2981         if (IS_ERR(ctx))
2982                 return PTR_ERR(ctx);
2983
2984         sattr->ia_mode &= ~current_umask();
2985         state = nfs4_do_open(dir, dentry, ctx->mode,
2986                         flags, sattr, ctx->cred,
2987                         &ctx->mdsthreshold);
2988         d_drop(dentry);
2989         if (IS_ERR(state)) {
2990                 status = PTR_ERR(state);
2991                 goto out;
2992         }
2993         d_add(dentry, igrab(state->inode));
2994         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2995         ctx->state = state;
2996 out:
2997         put_nfs_open_context(ctx);
2998         return status;
2999 }
3000
3001 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
3002 {
3003         struct nfs_server *server = NFS_SERVER(dir);
3004         struct nfs_removeargs args = {
3005                 .fh = NFS_FH(dir),
3006                 .name = *name,
3007         };
3008         struct nfs_removeres res = {
3009                 .server = server,
3010         };
3011         struct rpc_message msg = {
3012                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
3013                 .rpc_argp = &args,
3014                 .rpc_resp = &res,
3015         };
3016         int status;
3017
3018         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
3019         if (status == 0)
3020                 update_changeattr(dir, &res.cinfo);
3021         return status;
3022 }
3023
3024 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
3025 {
3026         struct nfs4_exception exception = { };
3027         int err;
3028         do {
3029                 err = nfs4_handle_exception(NFS_SERVER(dir),
3030                                 _nfs4_proc_remove(dir, name),
3031                                 &exception);
3032         } while (exception.retry);
3033         return err;
3034 }
3035
3036 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
3037 {
3038         struct nfs_server *server = NFS_SERVER(dir);
3039         struct nfs_removeargs *args = msg->rpc_argp;
3040         struct nfs_removeres *res = msg->rpc_resp;
3041
3042         res->server = server;
3043         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
3044         nfs41_init_sequence(&args->seq_args, &res->seq_res, 1);
3045 }
3046
3047 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
3048 {
3049         nfs4_setup_sequence(NFS_SERVER(data->dir),
3050                         &data->args.seq_args,
3051                         &data->res.seq_res,
3052                         task);
3053 }
3054
3055 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
3056 {
3057         struct nfs_removeres *res = task->tk_msg.rpc_resp;
3058
3059         if (!nfs4_sequence_done(task, &res->seq_res))
3060                 return 0;
3061         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3062                 return 0;
3063         update_changeattr(dir, &res->cinfo);
3064         return 1;
3065 }
3066
3067 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
3068 {
3069         struct nfs_server *server = NFS_SERVER(dir);
3070         struct nfs_renameargs *arg = msg->rpc_argp;
3071         struct nfs_renameres *res = msg->rpc_resp;
3072
3073         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
3074         res->server = server;
3075         nfs41_init_sequence(&arg->seq_args, &res->seq_res, 1);
3076 }
3077
3078 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3079 {
3080         nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3081                         &data->args.seq_args,
3082                         &data->res.seq_res,
3083                         task);
3084 }
3085
3086 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3087                                  struct inode *new_dir)
3088 {
3089         struct nfs_renameres *res = task->tk_msg.rpc_resp;
3090
3091         if (!nfs4_sequence_done(task, &res->seq_res))
3092                 return 0;
3093         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3094                 return 0;
3095
3096         update_changeattr(old_dir, &res->old_cinfo);
3097         update_changeattr(new_dir, &res->new_cinfo);
3098         return 1;
3099 }
3100
3101 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3102                 struct inode *new_dir, struct qstr *new_name)
3103 {
3104         struct nfs_server *server = NFS_SERVER(old_dir);
3105         struct nfs_renameargs arg = {
3106                 .old_dir = NFS_FH(old_dir),
3107                 .new_dir = NFS_FH(new_dir),
3108                 .old_name = old_name,
3109                 .new_name = new_name,
3110         };
3111         struct nfs_renameres res = {
3112                 .server = server,
3113         };
3114         struct rpc_message msg = {
3115                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
3116                 .rpc_argp = &arg,
3117                 .rpc_resp = &res,
3118         };
3119         int status = -ENOMEM;
3120         
3121         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3122         if (!status) {
3123                 update_changeattr(old_dir, &res.old_cinfo);
3124                 update_changeattr(new_dir, &res.new_cinfo);
3125         }
3126         return status;
3127 }
3128
3129 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3130                 struct inode *new_dir, struct qstr *new_name)
3131 {
3132         struct nfs4_exception exception = { };
3133         int err;
3134         do {
3135                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
3136                                 _nfs4_proc_rename(old_dir, old_name,
3137                                         new_dir, new_name),
3138                                 &exception);
3139         } while (exception.retry);
3140         return err;
3141 }
3142
3143 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3144 {
3145         struct nfs_server *server = NFS_SERVER(inode);
3146         struct nfs4_link_arg arg = {
3147                 .fh     = NFS_FH(inode),
3148                 .dir_fh = NFS_FH(dir),
3149                 .name   = name,
3150                 .bitmask = server->attr_bitmask,
3151         };
3152         struct nfs4_link_res res = {
3153                 .server = server,
3154         };
3155         struct rpc_message msg = {
3156                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3157                 .rpc_argp = &arg,
3158                 .rpc_resp = &res,
3159         };
3160         int status = -ENOMEM;
3161
3162         res.fattr = nfs_alloc_fattr();
3163         if (res.fattr == NULL)
3164                 goto out;
3165
3166         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3167         if (!status) {
3168                 update_changeattr(dir, &res.cinfo);
3169                 nfs_post_op_update_inode(inode, res.fattr);
3170         }
3171 out:
3172         nfs_free_fattr(res.fattr);
3173         return status;
3174 }
3175
3176 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3177 {
3178         struct nfs4_exception exception = { };
3179         int err;
3180         do {
3181                 err = nfs4_handle_exception(NFS_SERVER(inode),
3182                                 _nfs4_proc_link(inode, dir, name),
3183                                 &exception);
3184         } while (exception.retry);
3185         return err;
3186 }
3187
3188 struct nfs4_createdata {
3189         struct rpc_message msg;
3190         struct nfs4_create_arg arg;
3191         struct nfs4_create_res res;
3192         struct nfs_fh fh;
3193         struct nfs_fattr fattr;
3194 };
3195
3196 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3197                 struct qstr *name, struct iattr *sattr, u32 ftype)
3198 {
3199         struct nfs4_createdata *data;
3200
3201         data = kzalloc(sizeof(*data), GFP_KERNEL);
3202         if (data != NULL) {
3203                 struct nfs_server *server = NFS_SERVER(dir);
3204
3205                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3206                 data->msg.rpc_argp = &data->arg;
3207                 data->msg.rpc_resp = &data->res;
3208                 data->arg.dir_fh = NFS_FH(dir);
3209                 data->arg.server = server;
3210                 data->arg.name = name;
3211                 data->arg.attrs = sattr;
3212                 data->arg.ftype = ftype;
3213                 data->arg.bitmask = server->attr_bitmask;
3214                 data->res.server = server;
3215                 data->res.fh = &data->fh;
3216                 data->res.fattr = &data->fattr;
3217                 nfs_fattr_init(data->res.fattr);
3218         }
3219         return data;
3220 }
3221
3222 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3223 {
3224         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3225                                     &data->arg.seq_args, &data->res.seq_res, 1);
3226         if (status == 0) {
3227                 update_changeattr(dir, &data->res.dir_cinfo);
3228                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
3229         }
3230         return status;
3231 }
3232
3233 static void nfs4_free_createdata(struct nfs4_createdata *data)
3234 {
3235         kfree(data);
3236 }
3237
3238 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3239                 struct page *page, unsigned int len, struct iattr *sattr)
3240 {
3241         struct nfs4_createdata *data;
3242         int status = -ENAMETOOLONG;
3243
3244         if (len > NFS4_MAXPATHLEN)
3245                 goto out;
3246
3247         status = -ENOMEM;
3248         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3249         if (data == NULL)
3250                 goto out;
3251
3252         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3253         data->arg.u.symlink.pages = &page;
3254         data->arg.u.symlink.len = len;
3255         
3256         status = nfs4_do_create(dir, dentry, data);
3257
3258         nfs4_free_createdata(data);
3259 out:
3260         return status;
3261 }
3262
3263 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3264                 struct page *page, unsigned int len, struct iattr *sattr)
3265 {
3266         struct nfs4_exception exception = { };
3267         int err;
3268         do {
3269                 err = nfs4_handle_exception(NFS_SERVER(dir),
3270                                 _nfs4_proc_symlink(dir, dentry, page,
3271                                                         len, sattr),
3272                                 &exception);
3273         } while (exception.retry);
3274         return err;
3275 }
3276
3277 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3278                 struct iattr *sattr)
3279 {
3280         struct nfs4_createdata *data;
3281         int status = -ENOMEM;
3282
3283         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3284         if (data == NULL)
3285                 goto out;
3286
3287         status = nfs4_do_create(dir, dentry, data);
3288
3289         nfs4_free_createdata(data);
3290 out:
3291         return status;
3292 }
3293
3294 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3295                 struct iattr *sattr)
3296 {
3297         struct nfs4_exception exception = { };
3298         int err;
3299
3300         sattr->ia_mode &= ~current_umask();
3301         do {
3302                 err = nfs4_handle_exception(NFS_SERVER(dir),
3303                                 _nfs4_proc_mkdir(dir, dentry, sattr),
3304                                 &exception);
3305         } while (exception.retry);
3306         return err;
3307 }
3308
3309 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3310                 u64 cookie, struct page **pages, unsigned int count, int plus)
3311 {
3312         struct inode            *dir = dentry->d_inode;
3313         struct nfs4_readdir_arg args = {
3314                 .fh = NFS_FH(dir),
3315                 .pages = pages,
3316                 .pgbase = 0,
3317                 .count = count,
3318                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3319                 .plus = plus,
3320         };
3321         struct nfs4_readdir_res res;
3322         struct rpc_message msg = {
3323                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3324                 .rpc_argp = &args,
3325                 .rpc_resp = &res,
3326                 .rpc_cred = cred,
3327         };
3328         int                     status;
3329
3330         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3331                         dentry->d_parent->d_name.name,
3332                         dentry->d_name.name,
3333                         (unsigned long long)cookie);
3334         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3335         res.pgbase = args.pgbase;
3336         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3337         if (status >= 0) {
3338                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3339                 status += args.pgbase;
3340         }
3341
3342         nfs_invalidate_atime(dir);
3343
3344         dprintk("%s: returns %d\n", __func__, status);
3345         return status;
3346 }
3347
3348 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3349                 u64 cookie, struct page **pages, unsigned int count, int plus)
3350 {
3351         struct nfs4_exception exception = { };
3352         int err;
3353         do {
3354                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3355                                 _nfs4_proc_readdir(dentry, cred, cookie,
3356                                         pages, count, plus),
3357                                 &exception);
3358         } while (exception.retry);
3359         return err;
3360 }
3361
3362 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3363                 struct iattr *sattr, dev_t rdev)
3364 {
3365         struct nfs4_createdata *data;
3366         int mode = sattr->ia_mode;
3367         int status = -ENOMEM;
3368
3369         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3370         if (data == NULL)
3371                 goto out;
3372
3373         if (S_ISFIFO(mode))
3374                 data->arg.ftype = NF4FIFO;
3375         else if (S_ISBLK(mode)) {
3376                 data->arg.ftype = NF4BLK;
3377                 data->arg.u.device.specdata1 = MAJOR(rdev);
3378                 data->arg.u.device.specdata2 = MINOR(rdev);
3379         }
3380         else if (S_ISCHR(mode)) {
3381                 data->arg.ftype = NF4CHR;
3382                 data->arg.u.device.specdata1 = MAJOR(rdev);
3383                 data->arg.u.device.specdata2 = MINOR(rdev);
3384         } else if (!S_ISSOCK(mode)) {
3385                 status = -EINVAL;
3386                 goto out_free;
3387         }
3388         
3389         status = nfs4_do_create(dir, dentry, data);
3390 out_free:
3391         nfs4_free_createdata(data);
3392 out:
3393         return status;
3394 }
3395
3396 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3397                 struct iattr *sattr, dev_t rdev)
3398 {
3399         struct nfs4_exception exception = { };
3400         int err;
3401
3402         sattr->ia_mode &= ~current_umask();
3403         do {
3404                 err = nfs4_handle_exception(NFS_SERVER(dir),
3405                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3406                                 &exception);
3407         } while (exception.retry);
3408         return err;
3409 }
3410
3411 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3412                  struct nfs_fsstat *fsstat)
3413 {
3414         struct nfs4_statfs_arg args = {
3415                 .fh = fhandle,
3416                 .bitmask = server->attr_bitmask,
3417         };
3418         struct nfs4_statfs_res res = {
3419                 .fsstat = fsstat,
3420         };
3421         struct rpc_message msg = {
3422                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3423                 .rpc_argp = &args,
3424                 .rpc_resp = &res,
3425         };
3426
3427         nfs_fattr_init(fsstat->fattr);
3428         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3429 }
3430
3431 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3432 {
3433         struct nfs4_exception exception = { };
3434         int err;
3435         do {
3436                 err = nfs4_handle_exception(server,
3437                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3438                                 &exception);
3439         } while (exception.retry);
3440         return err;
3441 }
3442
3443 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3444                 struct nfs_fsinfo *fsinfo)
3445 {
3446         struct nfs4_fsinfo_arg args = {
3447                 .fh = fhandle,
3448                 .bitmask = server->attr_bitmask,
3449         };
3450         struct nfs4_fsinfo_res res = {
3451                 .fsinfo = fsinfo,
3452         };
3453         struct rpc_message msg = {
3454                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3455                 .rpc_argp = &args,
3456                 .rpc_resp = &res,
3457         };
3458
3459         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3460 }
3461
3462 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3463 {
3464         struct nfs4_exception exception = { };
3465         int err;
3466
3467         do {
3468                 err = nfs4_handle_exception(server,
3469                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3470                                 &exception);
3471         } while (exception.retry);
3472         return err;
3473 }
3474
3475 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3476 {
3477         int error;
3478
3479         nfs_fattr_init(fsinfo->fattr);
3480         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
3481         if (error == 0) {
3482                 /* block layout checks this! */
3483                 server->pnfs_blksize = fsinfo->blksize;
3484                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
3485         }
3486
3487         return error;
3488 }
3489
3490 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3491                 struct nfs_pathconf *pathconf)
3492 {
3493         struct nfs4_pathconf_arg args = {
3494                 .fh = fhandle,
3495                 .bitmask = server->attr_bitmask,
3496         };
3497         struct nfs4_pathconf_res res = {
3498                 .pathconf = pathconf,
3499         };
3500         struct rpc_message msg = {
3501                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3502                 .rpc_argp = &args,
3503                 .rpc_resp = &res,
3504         };
3505
3506         /* None of the pathconf attributes are mandatory to implement */
3507         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3508                 memset(pathconf, 0, sizeof(*pathconf));
3509                 return 0;
3510         }
3511
3512         nfs_fattr_init(pathconf->fattr);
3513         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3514 }
3515
3516 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3517                 struct nfs_pathconf *pathconf)
3518 {
3519         struct nfs4_exception exception = { };
3520         int err;
3521
3522         do {
3523                 err = nfs4_handle_exception(server,
3524                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3525                                 &exception);
3526         } while (exception.retry);
3527         return err;
3528 }
3529
3530 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
3531                 const struct nfs_open_context *ctx,
3532                 const struct nfs_lock_context *l_ctx,
3533                 fmode_t fmode)
3534 {
3535         const struct nfs_lockowner *lockowner = NULL;
3536
3537         if (l_ctx != NULL)
3538                 lockowner = &l_ctx->lockowner;
3539         return nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner);
3540 }
3541 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
3542
3543 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
3544                 const struct nfs_open_context *ctx,
3545                 const struct nfs_lock_context *l_ctx,
3546                 fmode_t fmode)
3547 {
3548         nfs4_stateid current_stateid;
3549
3550         if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode))
3551                 return false;
3552         return nfs4_stateid_match(stateid, &current_stateid);
3553 }
3554
3555 static bool nfs4_error_stateid_expired(int err)
3556 {
3557         switch (err) {
3558         case -NFS4ERR_DELEG_REVOKED:
3559         case -NFS4ERR_ADMIN_REVOKED:
3560         case -NFS4ERR_BAD_STATEID:
3561         case -NFS4ERR_STALE_STATEID:
3562         case -NFS4ERR_OLD_STATEID:
3563         case -NFS4ERR_OPENMODE:
3564         case -NFS4ERR_EXPIRED:
3565                 return true;
3566         }
3567         return false;
3568 }
3569
3570 void __nfs4_read_done_cb(struct nfs_read_data *data)
3571 {
3572         nfs_invalidate_atime(data->header->inode);
3573 }
3574
3575 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3576 {
3577         struct nfs_server *server = NFS_SERVER(data->header->inode);
3578
3579         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3580                 rpc_restart_call_prepare(task);
3581                 return -EAGAIN;
3582         }
3583
3584         __nfs4_read_done_cb(data);
3585         if (task->tk_status > 0)
3586                 renew_lease(server, data->timestamp);
3587         return 0;
3588 }
3589
3590 static bool nfs4_read_stateid_changed(struct rpc_task *task,
3591                 struct nfs_readargs *args)
3592 {
3593
3594         if (!nfs4_error_stateid_expired(task->tk_status) ||
3595                 nfs4_stateid_is_current(&args->stateid,
3596                                 args->context,
3597                                 args->lock_context,
3598                                 FMODE_READ))
3599                 return false;
3600         rpc_restart_call_prepare(task);
3601         return true;
3602 }
3603
3604 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3605 {
3606
3607         dprintk("--> %s\n", __func__);
3608
3609         if (!nfs4_sequence_done(task, &data->res.seq_res))
3610                 return -EAGAIN;
3611         if (nfs4_read_stateid_changed(task, &data->args))
3612                 return -EAGAIN;
3613         return data->read_done_cb ? data->read_done_cb(task, data) :
3614                                     nfs4_read_done_cb(task, data);
3615 }
3616
3617 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3618 {
3619         data->timestamp   = jiffies;
3620         data->read_done_cb = nfs4_read_done_cb;
3621         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3622         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
3623 }
3624
3625 static void nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
3626 {
3627         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3628                         &data->args.seq_args,
3629                         &data->res.seq_res,
3630                         task))
3631                 return;
3632         nfs4_set_rw_stateid(&data->args.stateid, data->args.context,
3633                         data->args.lock_context, FMODE_READ);
3634 }
3635
3636 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3637 {
3638         struct inode *inode = data->header->inode;
3639         
3640         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3641                 rpc_restart_call_prepare(task);
3642                 return -EAGAIN;
3643         }
3644         if (task->tk_status >= 0) {
3645                 renew_lease(NFS_SERVER(inode), data->timestamp);
3646                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
3647         }
3648         return 0;
3649 }
3650
3651 static bool nfs4_write_stateid_changed(struct rpc_task *task,
3652                 struct nfs_writeargs *args)
3653 {
3654
3655         if (!nfs4_error_stateid_expired(task->tk_status) ||
3656                 nfs4_stateid_is_current(&args->stateid,
3657                                 args->context,
3658                                 args->lock_context,
3659                                 FMODE_WRITE))
3660                 return false;
3661         rpc_restart_call_prepare(task);
3662         return true;
3663 }
3664
3665 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3666 {
3667         if (!nfs4_sequence_done(task, &data->res.seq_res))
3668                 return -EAGAIN;
3669         if (nfs4_write_stateid_changed(task, &data->args))
3670                 return -EAGAIN;
3671         return data->write_done_cb ? data->write_done_cb(task, data) :
3672                 nfs4_write_done_cb(task, data);
3673 }
3674
3675 static
3676 bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data)
3677 {
3678         const struct nfs_pgio_header *hdr = data->header;
3679
3680         /* Don't request attributes for pNFS or O_DIRECT writes */
3681         if (data->ds_clp != NULL || hdr->dreq != NULL)
3682                 return false;
3683         /* Otherwise, request attributes if and only if we don't hold
3684          * a delegation
3685          */
3686         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
3687 }
3688
3689 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3690 {
3691         struct nfs_server *server = NFS_SERVER(data->header->inode);
3692
3693         if (!nfs4_write_need_cache_consistency_data(data)) {
3694                 data->args.bitmask = NULL;
3695                 data->res.fattr = NULL;
3696         } else
3697                 data->args.bitmask = server->cache_consistency_bitmask;
3698
3699         if (!data->write_done_cb)
3700                 data->write_done_cb = nfs4_write_done_cb;
3701         data->res.server = server;
3702         data->timestamp   = jiffies;
3703
3704         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3705         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3706 }
3707
3708 static void nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
3709 {
3710         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3711                         &data->args.seq_args,
3712                         &data->res.seq_res,
3713                         task))
3714                 return;
3715         nfs4_set_rw_stateid(&data->args.stateid, data->args.context,
3716                         data->args.lock_context, FMODE_WRITE);
3717 }
3718
3719 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
3720 {
3721         nfs4_setup_sequence(NFS_SERVER(data->inode),
3722                         &data->args.seq_args,
3723                         &data->res.seq_res,
3724                         task);
3725 }
3726
3727 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
3728 {
3729         struct inode *inode = data->inode;
3730
3731         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3732                 rpc_restart_call_prepare(task);
3733                 return -EAGAIN;
3734         }
3735         return 0;
3736 }
3737
3738 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
3739 {
3740         if (!nfs4_sequence_done(task, &data->res.seq_res))
3741                 return -EAGAIN;
3742         return data->commit_done_cb(task, data);
3743 }
3744
3745 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
3746 {
3747         struct nfs_server *server = NFS_SERVER(data->inode);
3748
3749         if (data->commit_done_cb == NULL)
3750                 data->commit_done_cb = nfs4_commit_done_cb;
3751         data->res.server = server;
3752         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3753         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3754 }
3755
3756 struct nfs4_renewdata {
3757         struct nfs_client       *client;
3758         unsigned long           timestamp;
3759 };
3760
3761 /*
3762  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3763  * standalone procedure for queueing an asynchronous RENEW.
3764  */
3765 static void nfs4_renew_release(void *calldata)
3766 {
3767         struct nfs4_renewdata *data = calldata;
3768         struct nfs_client *clp = data->client;
3769
3770         if (atomic_read(&clp->cl_count) > 1)
3771                 nfs4_schedule_state_renewal(clp);
3772         nfs_put_client(clp);
3773         kfree(data);
3774 }
3775
3776 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3777 {
3778         struct nfs4_renewdata *data = calldata;
3779         struct nfs_client *clp = data->client;
3780         unsigned long timestamp = data->timestamp;
3781
3782         if (task->tk_status < 0) {
3783                 /* Unless we're shutting down, schedule state recovery! */
3784                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3785                         return;
3786                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3787                         nfs4_schedule_lease_recovery(clp);
3788                         return;
3789                 }
3790                 nfs4_schedule_path_down_recovery(clp);
3791         }
3792         do_renew_lease(clp, timestamp);
3793 }
3794
3795 static const struct rpc_call_ops nfs4_renew_ops = {
3796         .rpc_call_done = nfs4_renew_done,
3797         .rpc_release = nfs4_renew_release,
3798 };
3799
3800 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3801 {
3802         struct rpc_message msg = {
3803                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3804                 .rpc_argp       = clp,
3805                 .rpc_cred       = cred,
3806         };
3807         struct nfs4_renewdata *data;
3808
3809         if (renew_flags == 0)
3810                 return 0;
3811         if (!atomic_inc_not_zero(&clp->cl_count))
3812                 return -EIO;
3813         data = kmalloc(sizeof(*data), GFP_NOFS);
3814         if (data == NULL)
3815                 return -ENOMEM;
3816         data->client = clp;
3817         data->timestamp = jiffies;
3818         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
3819                         &nfs4_renew_ops, data);
3820 }
3821
3822 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3823 {
3824         struct rpc_message msg = {
3825                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3826                 .rpc_argp       = clp,
3827                 .rpc_cred       = cred,
3828         };
3829         unsigned long now = jiffies;
3830         int status;
3831
3832         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3833         if (status < 0)
3834                 return status;
3835         do_renew_lease(clp, now);
3836         return 0;
3837 }
3838
3839 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3840 {
3841         return (server->caps & NFS_CAP_ACLS)
3842                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3843                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3844 }
3845
3846 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
3847  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
3848  * the stack.
3849  */
3850 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
3851
3852 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3853                 struct page **pages, unsigned int *pgbase)
3854 {
3855         struct page *newpage, **spages;
3856         int rc = 0;
3857         size_t len;
3858         spages = pages;
3859
3860         do {
3861                 len = min_t(size_t, PAGE_SIZE, buflen);
3862                 newpage = alloc_page(GFP_KERNEL);
3863
3864                 if (newpage == NULL)
3865                         goto unwind;
3866                 memcpy(page_address(newpage), buf, len);
3867                 buf += len;
3868                 buflen -= len;
3869                 *pages++ = newpage;
3870                 rc++;
3871         } while (buflen != 0);
3872
3873         return rc;
3874
3875 unwind:
3876         for(; rc > 0; rc--)
3877                 __free_page(spages[rc-1]);
3878         return -ENOMEM;
3879 }
3880
3881 struct nfs4_cached_acl {
3882         int cached;
3883         size_t len;
3884         char data[0];
3885 };
3886
3887 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3888 {
3889         struct nfs_inode *nfsi = NFS_I(inode);
3890
3891         spin_lock(&inode->i_lock);
3892         kfree(nfsi->nfs4_acl);
3893         nfsi->nfs4_acl = acl;
3894         spin_unlock(&inode->i_lock);
3895 }
3896
3897 static void nfs4_zap_acl_attr(struct inode *inode)
3898 {
3899         nfs4_set_cached_acl(inode, NULL);
3900 }
3901
3902 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3903 {
3904         struct nfs_inode *nfsi = NFS_I(inode);
3905         struct nfs4_cached_acl *acl;
3906         int ret = -ENOENT;
3907
3908         spin_lock(&inode->i_lock);
3909         acl = nfsi->nfs4_acl;
3910         if (acl == NULL)
3911                 goto out;
3912         if (buf == NULL) /* user is just asking for length */
3913                 goto out_len;
3914         if (acl->cached == 0)
3915                 goto out;
3916         ret = -ERANGE; /* see getxattr(2) man page */
3917         if (acl->len > buflen)
3918                 goto out;
3919         memcpy(buf, acl->data, acl->len);
3920 out_len:
3921         ret = acl->len;
3922 out:
3923         spin_unlock(&inode->i_lock);
3924         return ret;
3925 }
3926
3927 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
3928 {
3929         struct nfs4_cached_acl *acl;
3930         size_t buflen = sizeof(*acl) + acl_len;
3931
3932         if (buflen <= PAGE_SIZE) {
3933                 acl = kmalloc(buflen, GFP_KERNEL);
3934                 if (acl == NULL)
3935                         goto out;
3936                 acl->cached = 1;
3937                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
3938         } else {
3939                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3940                 if (acl == NULL)
3941                         goto out;
3942                 acl->cached = 0;
3943         }
3944         acl->len = acl_len;
3945 out:
3946         nfs4_set_cached_acl(inode, acl);
3947 }
3948
3949 /*
3950  * The getxattr API returns the required buffer length when called with a
3951  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
3952  * the required buf.  On a NULL buf, we send a page of data to the server
3953  * guessing that the ACL request can be serviced by a page. If so, we cache
3954  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
3955  * the cache. If not so, we throw away the page, and cache the required
3956  * length. The next getxattr call will then produce another round trip to
3957  * the server, this time with the input buf of the required size.
3958  */
3959 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3960 {
3961         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
3962         struct nfs_getaclargs args = {
3963                 .fh = NFS_FH(inode),
3964                 .acl_pages = pages,
3965                 .acl_len = buflen,
3966         };
3967         struct nfs_getaclres res = {
3968                 .acl_len = buflen,
3969         };
3970         struct rpc_message msg = {
3971                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3972                 .rpc_argp = &args,
3973                 .rpc_resp = &res,
3974         };
3975         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
3976         int ret = -ENOMEM, i;
3977
3978         /* As long as we're doing a round trip to the server anyway,
3979          * let's be prepared for a page of acl data. */
3980         if (npages == 0)
3981                 npages = 1;
3982         if (npages > ARRAY_SIZE(pages))
3983                 return -ERANGE;
3984
3985         for (i = 0; i < npages; i++) {
3986                 pages[i] = alloc_page(GFP_KERNEL);
3987                 if (!pages[i])
3988                         goto out_free;
3989         }
3990
3991         /* for decoding across pages */
3992         res.acl_scratch = alloc_page(GFP_KERNEL);
3993         if (!res.acl_scratch)
3994                 goto out_free;
3995
3996         args.acl_len = npages * PAGE_SIZE;
3997         args.acl_pgbase = 0;
3998
3999         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
4000                 __func__, buf, buflen, npages, args.acl_len);
4001         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
4002                              &msg, &args.seq_args, &res.seq_res, 0);
4003         if (ret)
4004                 goto out_free;
4005
4006         /* Handle the case where the passed-in buffer is too short */
4007         if (res.acl_flags & NFS4_ACL_TRUNC) {
4008                 /* Did the user only issue a request for the acl length? */
4009                 if (buf == NULL)
4010                         goto out_ok;
4011                 ret = -ERANGE;
4012                 goto out_free;
4013         }
4014         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
4015         if (buf) {
4016                 if (res.acl_len > buflen) {
4017                         ret = -ERANGE;
4018                         goto out_free;
4019                 }
4020                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
4021         }
4022 out_ok:
4023         ret = res.acl_len;
4024 out_free:
4025         for (i = 0; i < npages; i++)
4026                 if (pages[i])
4027                         __free_page(pages[i]);
4028         if (res.acl_scratch)
4029                 __free_page(res.acl_scratch);
4030         return ret;
4031 }
4032
4033 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4034 {
4035         struct nfs4_exception exception = { };
4036         ssize_t ret;
4037         do {
4038                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
4039                 if (ret >= 0)
4040                         break;
4041                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
4042         } while (exception.retry);
4043         return ret;
4044 }
4045
4046 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
4047 {
4048         struct nfs_server *server = NFS_SERVER(inode);
4049         int ret;
4050
4051         if (!nfs4_server_supports_acls(server))
4052                 return -EOPNOTSUPP;
4053         ret = nfs_revalidate_inode(server, inode);
4054         if (ret < 0)
4055                 return ret;
4056         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
4057                 nfs_zap_acl_cache(inode);
4058         ret = nfs4_read_cached_acl(inode, buf, buflen);
4059         if (ret != -ENOENT)
4060                 /* -ENOENT is returned if there is no ACL or if there is an ACL
4061                  * but no cached acl data, just the acl length */
4062                 return ret;
4063         return nfs4_get_acl_uncached(inode, buf, buflen);
4064 }
4065
4066 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4067 {
4068         struct nfs_server *server = NFS_SERVER(inode);
4069         struct page *pages[NFS4ACL_MAXPAGES];
4070         struct nfs_setaclargs arg = {
4071                 .fh             = NFS_FH(inode),
4072                 .acl_pages      = pages,
4073                 .acl_len        = buflen,
4074         };
4075         struct nfs_setaclres res;
4076         struct rpc_message msg = {
4077                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
4078                 .rpc_argp       = &arg,
4079                 .rpc_resp       = &res,
4080         };
4081         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4082         int ret, i;
4083
4084         if (!nfs4_server_supports_acls(server))
4085                 return -EOPNOTSUPP;
4086         if (npages > ARRAY_SIZE(pages))
4087                 return -ERANGE;
4088         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
4089         if (i < 0)
4090                 return i;
4091         nfs4_inode_return_delegation(inode);
4092         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4093
4094         /*
4095          * Free each page after tx, so the only ref left is
4096          * held by the network stack
4097          */
4098         for (; i > 0; i--)
4099                 put_page(pages[i-1]);
4100
4101         /*
4102          * Acl update can result in inode attribute update.
4103          * so mark the attribute cache invalid.
4104          */
4105         spin_lock(&inode->i_lock);
4106         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
4107         spin_unlock(&inode->i_lock);
4108         nfs_access_zap_cache(inode);
4109         nfs_zap_acl_cache(inode);
4110         return ret;
4111 }
4112
4113 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4114 {
4115         struct nfs4_exception exception = { };
4116         int err;
4117         do {
4118                 err = nfs4_handle_exception(NFS_SERVER(inode),
4119                                 __nfs4_proc_set_acl(inode, buf, buflen),
4120                                 &exception);
4121         } while (exception.retry);
4122         return err;
4123 }
4124
4125 static int
4126 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
4127 {
4128         struct nfs_client *clp = server->nfs_client;
4129
4130         if (task->tk_status >= 0)
4131                 return 0;
4132         switch(task->tk_status) {
4133                 case -NFS4ERR_DELEG_REVOKED:
4134                 case -NFS4ERR_ADMIN_REVOKED:
4135                 case -NFS4ERR_BAD_STATEID:
4136                         if (state == NULL)
4137                                 break;
4138                         nfs_remove_bad_delegation(state->inode);
4139                 case -NFS4ERR_OPENMODE:
4140                         if (state == NULL)
4141                                 break;
4142                         if (nfs4_schedule_stateid_recovery(server, state) < 0)
4143                                 goto stateid_invalid;
4144                         goto wait_on_recovery;
4145                 case -NFS4ERR_EXPIRED:
4146                         if (state != NULL) {
4147                                 if (nfs4_schedule_stateid_recovery(server, state) < 0)
4148                                         goto stateid_invalid;
4149                         }
4150                 case -NFS4ERR_STALE_STATEID:
4151                 case -NFS4ERR_STALE_CLIENTID:
4152                         nfs4_schedule_lease_recovery(clp);
4153                         goto wait_on_recovery;
4154 #if defined(CONFIG_NFS_V4_1)
4155                 case -NFS4ERR_BADSESSION:
4156                 case -NFS4ERR_BADSLOT:
4157                 case -NFS4ERR_BAD_HIGH_SLOT:
4158                 case -NFS4ERR_DEADSESSION:
4159                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4160                 case -NFS4ERR_SEQ_FALSE_RETRY:
4161                 case -NFS4ERR_SEQ_MISORDERED:
4162                         dprintk("%s ERROR %d, Reset session\n", __func__,
4163                                 task->tk_status);
4164                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
4165                         task->tk_status = 0;
4166                         return -EAGAIN;
4167 #endif /* CONFIG_NFS_V4_1 */
4168                 case -NFS4ERR_DELAY:
4169                         nfs_inc_server_stats(server, NFSIOS_DELAY);
4170                 case -NFS4ERR_GRACE:
4171                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
4172                         task->tk_status = 0;
4173                         return -EAGAIN;
4174                 case -NFS4ERR_RETRY_UNCACHED_REP:
4175                 case -NFS4ERR_OLD_STATEID:
4176                         task->tk_status = 0;
4177                         return -EAGAIN;
4178         }
4179         task->tk_status = nfs4_map_errors(task->tk_status);
4180         return 0;
4181 stateid_invalid:
4182         task->tk_status = -EIO;
4183         return 0;
4184 wait_on_recovery:
4185         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
4186         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
4187                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
4188         task->tk_status = 0;
4189         return -EAGAIN;
4190 }
4191
4192 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
4193                                     nfs4_verifier *bootverf)
4194 {
4195         __be32 verf[2];
4196
4197         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
4198                 /* An impossible timestamp guarantees this value
4199                  * will never match a generated boot time. */
4200                 verf[0] = 0;
4201                 verf[1] = (__be32)(NSEC_PER_SEC + 1);
4202         } else {
4203                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4204                 verf[0] = (__be32)nn->boot_time.tv_sec;
4205                 verf[1] = (__be32)nn->boot_time.tv_nsec;
4206         }
4207         memcpy(bootverf->data, verf, sizeof(bootverf->data));
4208 }
4209
4210 static unsigned int
4211 nfs4_init_nonuniform_client_string(const struct nfs_client *clp,
4212                                    char *buf, size_t len)
4213 {
4214         unsigned int result;
4215
4216         rcu_read_lock();
4217         result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4218                                 clp->cl_ipaddr,
4219                                 rpc_peeraddr2str(clp->cl_rpcclient,
4220                                                         RPC_DISPLAY_ADDR),
4221                                 rpc_peeraddr2str(clp->cl_rpcclient,
4222                                                         RPC_DISPLAY_PROTO));
4223         rcu_read_unlock();
4224         return result;
4225 }
4226
4227 static unsigned int
4228 nfs4_init_uniform_client_string(const struct nfs_client *clp,
4229                                 char *buf, size_t len)
4230 {
4231         char *nodename = clp->cl_rpcclient->cl_nodename;
4232
4233         if (nfs4_client_id_uniquifier[0] != '\0')
4234                 nodename = nfs4_client_id_uniquifier;
4235         return scnprintf(buf, len, "Linux NFSv%u.%u %s",
4236                                 clp->rpc_ops->version, clp->cl_minorversion,
4237                                 nodename);
4238 }
4239
4240 /**
4241  * nfs4_proc_setclientid - Negotiate client ID
4242  * @clp: state data structure
4243  * @program: RPC program for NFSv4 callback service
4244  * @port: IP port number for NFS4 callback service
4245  * @cred: RPC credential to use for this call
4246  * @res: where to place the result
4247  *
4248  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4249  */
4250 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
4251                 unsigned short port, struct rpc_cred *cred,
4252                 struct nfs4_setclientid_res *res)
4253 {
4254         nfs4_verifier sc_verifier;
4255         struct nfs4_setclientid setclientid = {
4256                 .sc_verifier = &sc_verifier,
4257                 .sc_prog = program,
4258                 .sc_cb_ident = clp->cl_cb_ident,
4259         };
4260         struct rpc_message msg = {
4261                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
4262                 .rpc_argp = &setclientid,
4263                 .rpc_resp = res,
4264                 .rpc_cred = cred,
4265         };
4266         int status;
4267
4268         /* nfs_client_id4 */
4269         nfs4_init_boot_verifier(clp, &sc_verifier);
4270         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
4271                 setclientid.sc_name_len =
4272                                 nfs4_init_uniform_client_string(clp,
4273                                                 setclientid.sc_name,
4274                                                 sizeof(setclientid.sc_name));
4275         else
4276                 setclientid.sc_name_len =
4277                                 nfs4_init_nonuniform_client_string(clp,
4278                                                 setclientid.sc_name,
4279                                                 sizeof(setclientid.sc_name));
4280         /* cb_client4 */
4281         rcu_read_lock();
4282         setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
4283                                 sizeof(setclientid.sc_netid),
4284                                 rpc_peeraddr2str(clp->cl_rpcclient,
4285                                                         RPC_DISPLAY_NETID));
4286         rcu_read_unlock();
4287         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
4288                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
4289                                 clp->cl_ipaddr, port >> 8, port & 255);
4290
4291         dprintk("NFS call  setclientid auth=%s, '%.*s'\n",
4292                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4293                 setclientid.sc_name_len, setclientid.sc_name);
4294         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4295         dprintk("NFS reply setclientid: %d\n", status);
4296         return status;
4297 }
4298
4299 /**
4300  * nfs4_proc_setclientid_confirm - Confirm client ID
4301  * @clp: state data structure
4302  * @res: result of a previous SETCLIENTID
4303  * @cred: RPC credential to use for this call
4304  *
4305  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4306  */
4307 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
4308                 struct nfs4_setclientid_res *arg,
4309                 struct rpc_cred *cred)
4310 {
4311         struct nfs_fsinfo fsinfo;
4312         struct rpc_message msg = {
4313                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4314                 .rpc_argp = arg,
4315                 .rpc_resp = &fsinfo,
4316                 .rpc_cred = cred,
4317         };
4318         unsigned long now;
4319         int status;
4320
4321         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
4322                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4323                 clp->cl_clientid);
4324         now = jiffies;
4325         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4326         if (status == 0) {
4327                 spin_lock(&clp->cl_lock);
4328                 clp->cl_lease_time = fsinfo.lease_time * HZ;
4329                 clp->cl_last_renewal = now;
4330                 spin_unlock(&clp->cl_lock);
4331         }
4332         dprintk("NFS reply setclientid_confirm: %d\n", status);
4333         return status;
4334 }
4335
4336 struct nfs4_delegreturndata {
4337         struct nfs4_delegreturnargs args;
4338         struct nfs4_delegreturnres res;
4339         struct nfs_fh fh;
4340         nfs4_stateid stateid;
4341         unsigned long timestamp;
4342         struct nfs_fattr fattr;
4343         int rpc_status;
4344 };
4345
4346 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4347 {
4348         struct nfs4_delegreturndata *data = calldata;
4349
4350         if (!nfs4_sequence_done(task, &data->res.seq_res))
4351                 return;
4352
4353         switch (task->tk_status) {
4354         case -NFS4ERR_STALE_STATEID:
4355         case -NFS4ERR_EXPIRED:
4356         case 0:
4357                 renew_lease(data->res.server, data->timestamp);
4358                 break;
4359         default:
4360                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
4361                                 -EAGAIN) {
4362                         rpc_restart_call_prepare(task);
4363                         return;
4364                 }
4365         }
4366         data->rpc_status = task->tk_status;
4367 }
4368
4369 static void nfs4_delegreturn_release(void *calldata)
4370 {
4371         kfree(calldata);
4372 }
4373
4374 #if defined(CONFIG_NFS_V4_1)
4375 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
4376 {
4377         struct nfs4_delegreturndata *d_data;
4378
4379         d_data = (struct nfs4_delegreturndata *)data;
4380
4381         nfs4_setup_sequence(d_data->res.server,
4382                         &d_data->args.seq_args,
4383                         &d_data->res.seq_res,
4384                         task);
4385 }
4386 #endif /* CONFIG_NFS_V4_1 */
4387
4388 static const struct rpc_call_ops nfs4_delegreturn_ops = {
4389 #if defined(CONFIG_NFS_V4_1)
4390         .rpc_call_prepare = nfs4_delegreturn_prepare,
4391 #endif /* CONFIG_NFS_V4_1 */
4392         .rpc_call_done = nfs4_delegreturn_done,
4393         .rpc_release = nfs4_delegreturn_release,
4394 };
4395
4396 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4397 {
4398         struct nfs4_delegreturndata *data;
4399         struct nfs_server *server = NFS_SERVER(inode);
4400         struct rpc_task *task;
4401         struct rpc_message msg = {
4402                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
4403                 .rpc_cred = cred,
4404         };
4405         struct rpc_task_setup task_setup_data = {
4406                 .rpc_client = server->client,
4407                 .rpc_message = &msg,
4408                 .callback_ops = &nfs4_delegreturn_ops,
4409                 .flags = RPC_TASK_ASYNC,
4410         };
4411         int status = 0;
4412
4413         data = kzalloc(sizeof(*data), GFP_NOFS);
4414         if (data == NULL)
4415                 return -ENOMEM;
4416         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4417         data->args.fhandle = &data->fh;
4418         data->args.stateid = &data->stateid;
4419         data->args.bitmask = server->cache_consistency_bitmask;
4420         nfs_copy_fh(&data->fh, NFS_FH(inode));
4421         nfs4_stateid_copy(&data->stateid, stateid);
4422         data->res.fattr = &data->fattr;
4423         data->res.server = server;
4424         nfs_fattr_init(data->res.fattr);
4425         data->timestamp = jiffies;
4426         data->rpc_status = 0;
4427
4428         task_setup_data.callback_data = data;
4429         msg.rpc_argp = &data->args;
4430         msg.rpc_resp = &data->res;
4431         task = rpc_run_task(&task_setup_data);
4432         if (IS_ERR(task))
4433                 return PTR_ERR(task);
4434         if (!issync)
4435                 goto out;
4436         status = nfs4_wait_for_completion_rpc_task(task);
4437         if (status != 0)
4438                 goto out;
4439         status = data->rpc_status;
4440         if (status == 0)
4441                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4442         else
4443                 nfs_refresh_inode(inode, &data->fattr);
4444 out:
4445         rpc_put_task(task);
4446         return status;
4447 }
4448
4449 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4450 {
4451         struct nfs_server *server = NFS_SERVER(inode);
4452         struct nfs4_exception exception = { };
4453         int err;
4454         do {
4455                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
4456                 switch (err) {
4457                         case -NFS4ERR_STALE_STATEID:
4458                         case -NFS4ERR_EXPIRED:
4459                         case 0:
4460                                 return 0;
4461                 }
4462                 err = nfs4_handle_exception(server, err, &exception);
4463         } while (exception.retry);
4464         return err;
4465 }
4466
4467 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
4468 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
4469
4470 /* 
4471  * sleep, with exponential backoff, and retry the LOCK operation. 
4472  */
4473 static unsigned long
4474 nfs4_set_lock_task_retry(unsigned long timeout)
4475 {
4476         freezable_schedule_timeout_killable(timeout);
4477         timeout <<= 1;
4478         if (timeout > NFS4_LOCK_MAXTIMEOUT)
4479                 return NFS4_LOCK_MAXTIMEOUT;
4480         return timeout;
4481 }
4482
4483 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4484 {
4485         struct inode *inode = state->inode;
4486         struct nfs_server *server = NFS_SERVER(inode);
4487         struct nfs_client *clp = server->nfs_client;
4488         struct nfs_lockt_args arg = {
4489                 .fh = NFS_FH(inode),
4490                 .fl = request,
4491         };
4492         struct nfs_lockt_res res = {
4493                 .denied = request,
4494         };
4495         struct rpc_message msg = {
4496                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4497                 .rpc_argp       = &arg,
4498                 .rpc_resp       = &res,
4499                 .rpc_cred       = state->owner->so_cred,
4500         };
4501         struct nfs4_lock_state *lsp;
4502         int status;
4503
4504         arg.lock_owner.clientid = clp->cl_clientid;
4505         status = nfs4_set_lock_state(state, request);
4506         if (status != 0)
4507                 goto out;
4508         lsp = request->fl_u.nfs4_fl.owner;
4509         arg.lock_owner.id = lsp->ls_seqid.owner_id;
4510         arg.lock_owner.s_dev = server->s_dev;
4511         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4512         switch (status) {
4513                 case 0:
4514                         request->fl_type = F_UNLCK;
4515                         break;
4516                 case -NFS4ERR_DENIED:
4517                         status = 0;
4518         }
4519         request->fl_ops->fl_release_private(request);
4520 out:
4521         return status;
4522 }
4523
4524 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4525 {
4526         struct nfs4_exception exception = { };
4527         int err;
4528
4529         do {
4530                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4531                                 _nfs4_proc_getlk(state, cmd, request),
4532                                 &exception);
4533         } while (exception.retry);
4534         return err;
4535 }
4536
4537 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4538 {
4539         int res = 0;
4540         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4541                 case FL_POSIX:
4542                         res = posix_lock_file_wait(file, fl);
4543                         break;
4544                 case FL_FLOCK:
4545                         res = flock_lock_file_wait(file, fl);
4546                         break;
4547                 default:
4548                         BUG();
4549         }
4550         return res;
4551 }
4552
4553 struct nfs4_unlockdata {
4554         struct nfs_locku_args arg;
4555         struct nfs_locku_res res;
4556         struct nfs4_lock_state *lsp;
4557         struct nfs_open_context *ctx;
4558         struct file_lock fl;
4559         const struct nfs_server *server;
4560         unsigned long timestamp;
4561 };
4562
4563 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4564                 struct nfs_open_context *ctx,
4565                 struct nfs4_lock_state *lsp,
4566                 struct nfs_seqid *seqid)
4567 {
4568         struct nfs4_unlockdata *p;
4569         struct inode *inode = lsp->ls_state->inode;
4570
4571         p = kzalloc(sizeof(*p), GFP_NOFS);
4572         if (p == NULL)
4573                 return NULL;
4574         p->arg.fh = NFS_FH(inode);
4575         p->arg.fl = &p->fl;
4576         p->arg.seqid = seqid;
4577         p->res.seqid = seqid;
4578         p->arg.stateid = &lsp->ls_stateid;
4579         p->lsp = lsp;
4580         atomic_inc(&lsp->ls_count);
4581         /* Ensure we don't close file until we're done freeing locks! */
4582         p->ctx = get_nfs_open_context(ctx);
4583         memcpy(&p->fl, fl, sizeof(p->fl));
4584         p->server = NFS_SERVER(inode);
4585         return p;
4586 }
4587
4588 static void nfs4_locku_release_calldata(void *data)
4589 {
4590         struct nfs4_unlockdata *calldata = data;
4591         nfs_free_seqid(calldata->arg.seqid);
4592         nfs4_put_lock_state(calldata->lsp);
4593         put_nfs_open_context(calldata->ctx);
4594         kfree(calldata);
4595 }
4596
4597 static void nfs4_locku_done(struct rpc_task *task, void *data)
4598 {
4599         struct nfs4_unlockdata *calldata = data;
4600
4601         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4602                 return;
4603         switch (task->tk_status) {
4604                 case 0:
4605                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
4606                                         &calldata->res.stateid);
4607                         renew_lease(calldata->server, calldata->timestamp);
4608                         break;
4609                 case -NFS4ERR_BAD_STATEID:
4610                 case -NFS4ERR_OLD_STATEID:
4611                 case -NFS4ERR_STALE_STATEID:
4612                 case -NFS4ERR_EXPIRED:
4613                         break;
4614                 default:
4615                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4616                                 rpc_restart_call_prepare(task);
4617         }
4618         nfs_release_seqid(calldata->arg.seqid);
4619 }
4620
4621 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4622 {
4623         struct nfs4_unlockdata *calldata = data;
4624
4625         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4626                 goto out_wait;
4627         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
4628                 /* Note: exit _without_ running nfs4_locku_done */
4629                 goto out_no_action;
4630         }
4631         calldata->timestamp = jiffies;
4632         if (nfs4_setup_sequence(calldata->server,
4633                                 &calldata->arg.seq_args,
4634                                 &calldata->res.seq_res,
4635                                 task) != 0)
4636                 nfs_release_seqid(calldata->arg.seqid);
4637         return;
4638 out_no_action:
4639         task->tk_action = NULL;
4640 out_wait:
4641         nfs4_sequence_done(task, &calldata->res.seq_res);
4642 }
4643
4644 static const struct rpc_call_ops nfs4_locku_ops = {
4645         .rpc_call_prepare = nfs4_locku_prepare,
4646         .rpc_call_done = nfs4_locku_done,
4647         .rpc_release = nfs4_locku_release_calldata,
4648 };
4649
4650 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4651                 struct nfs_open_context *ctx,
4652                 struct nfs4_lock_state *lsp,
4653                 struct nfs_seqid *seqid)
4654 {
4655         struct nfs4_unlockdata *data;
4656         struct rpc_message msg = {
4657                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4658                 .rpc_cred = ctx->cred,
4659         };
4660         struct rpc_task_setup task_setup_data = {
4661                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4662                 .rpc_message = &msg,
4663                 .callback_ops = &nfs4_locku_ops,
4664                 .workqueue = nfsiod_workqueue,
4665                 .flags = RPC_TASK_ASYNC,
4666         };
4667
4668         /* Ensure this is an unlock - when canceling a lock, the
4669          * canceled lock is passed in, and it won't be an unlock.
4670          */
4671         fl->fl_type = F_UNLCK;
4672
4673         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4674         if (data == NULL) {
4675                 nfs_free_seqid(seqid);
4676                 return ERR_PTR(-ENOMEM);
4677         }
4678
4679         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4680         msg.rpc_argp = &data->arg;
4681         msg.rpc_resp = &data->res;
4682         task_setup_data.callback_data = data;
4683         return rpc_run_task(&task_setup_data);
4684 }
4685
4686 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4687 {
4688         struct inode *inode = state->inode;
4689         struct nfs4_state_owner *sp = state->owner;
4690         struct nfs_inode *nfsi = NFS_I(inode);
4691         struct nfs_seqid *seqid;
4692         struct nfs4_lock_state *lsp;
4693         struct rpc_task *task;
4694         int status = 0;
4695         unsigned char fl_flags = request->fl_flags;
4696
4697         status = nfs4_set_lock_state(state, request);
4698         /* Unlock _before_ we do the RPC call */
4699         request->fl_flags |= FL_EXISTS;
4700         /* Exclude nfs_delegation_claim_locks() */
4701         mutex_lock(&sp->so_delegreturn_mutex);
4702         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
4703         down_read(&nfsi->rwsem);
4704         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4705                 up_read(&nfsi->rwsem);
4706                 mutex_unlock(&sp->so_delegreturn_mutex);
4707                 goto out;
4708         }
4709         up_read(&nfsi->rwsem);
4710         mutex_unlock(&sp->so_delegreturn_mutex);
4711         if (status != 0)
4712                 goto out;
4713         /* Is this a delegated lock? */
4714         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4715                 goto out;
4716         lsp = request->fl_u.nfs4_fl.owner;
4717         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4718         status = -ENOMEM;
4719         if (seqid == NULL)
4720                 goto out;
4721         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4722         status = PTR_ERR(task);
4723         if (IS_ERR(task))
4724                 goto out;
4725         status = nfs4_wait_for_completion_rpc_task(task);
4726         rpc_put_task(task);
4727 out:
4728         request->fl_flags = fl_flags;
4729         return status;
4730 }
4731
4732 struct nfs4_lockdata {
4733         struct nfs_lock_args arg;
4734         struct nfs_lock_res res;
4735         struct nfs4_lock_state *lsp;
4736         struct nfs_open_context *ctx;
4737         struct file_lock fl;
4738         unsigned long timestamp;
4739         int rpc_status;
4740         int cancelled;
4741         struct nfs_server *server;
4742 };
4743
4744 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4745                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4746                 gfp_t gfp_mask)
4747 {
4748         struct nfs4_lockdata *p;
4749         struct inode *inode = lsp->ls_state->inode;
4750         struct nfs_server *server = NFS_SERVER(inode);
4751
4752         p = kzalloc(sizeof(*p), gfp_mask);
4753         if (p == NULL)
4754                 return NULL;
4755
4756         p->arg.fh = NFS_FH(inode);
4757         p->arg.fl = &p->fl;
4758         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4759         if (p->arg.open_seqid == NULL)
4760                 goto out_free;
4761         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4762         if (p->arg.lock_seqid == NULL)
4763                 goto out_free_seqid;
4764         p->arg.lock_stateid = &lsp->ls_stateid;
4765         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4766         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
4767         p->arg.lock_owner.s_dev = server->s_dev;
4768         p->res.lock_seqid = p->arg.lock_seqid;
4769         p->lsp = lsp;
4770         p->server = server;
4771         atomic_inc(&lsp->ls_count);
4772         p->ctx = get_nfs_open_context(ctx);
4773         memcpy(&p->fl, fl, sizeof(p->fl));
4774         return p;
4775 out_free_seqid:
4776         nfs_free_seqid(p->arg.open_seqid);
4777 out_free:
4778         kfree(p);
4779         return NULL;
4780 }
4781
4782 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4783 {
4784         struct nfs4_lockdata *data = calldata;
4785         struct nfs4_state *state = data->lsp->ls_state;
4786
4787         dprintk("%s: begin!\n", __func__);
4788         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4789                 goto out_wait;
4790         /* Do we need to do an open_to_lock_owner? */
4791         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4792                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
4793                         goto out_release_lock_seqid;
4794                 }
4795                 data->arg.open_stateid = &state->stateid;
4796                 data->arg.new_lock_owner = 1;
4797                 data->res.open_seqid = data->arg.open_seqid;
4798         } else
4799                 data->arg.new_lock_owner = 0;
4800         if (!nfs4_valid_open_stateid(state)) {
4801                 data->rpc_status = -EBADF;
4802                 task->tk_action = NULL;
4803                 goto out_release_open_seqid;
4804         }
4805         data->timestamp = jiffies;
4806         if (nfs4_setup_sequence(data->server,
4807                                 &data->arg.seq_args,
4808                                 &data->res.seq_res,
4809                                 task) == 0)
4810                 return;
4811 out_release_open_seqid:
4812         nfs_release_seqid(data->arg.open_seqid);
4813 out_release_lock_seqid:
4814         nfs_release_seqid(data->arg.lock_seqid);
4815 out_wait:
4816         nfs4_sequence_done(task, &data->res.seq_res);
4817         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4818 }
4819
4820 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4821 {
4822         struct nfs4_lockdata *data = calldata;
4823
4824         dprintk("%s: begin!\n", __func__);
4825
4826         if (!nfs4_sequence_done(task, &data->res.seq_res))
4827                 return;
4828
4829         data->rpc_status = task->tk_status;
4830         if (data->arg.new_lock_owner != 0) {
4831                 if (data->rpc_status == 0)
4832                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4833                 else
4834                         goto out;
4835         }
4836         if (data->rpc_status == 0) {
4837                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
4838                 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags);
4839                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4840         }
4841 out:
4842         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4843 }
4844
4845 static void nfs4_lock_release(void *calldata)
4846 {
4847         struct nfs4_lockdata *data = calldata;
4848
4849         dprintk("%s: begin!\n", __func__);
4850         nfs_free_seqid(data->arg.open_seqid);
4851         if (data->cancelled != 0) {
4852                 struct rpc_task *task;
4853                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4854                                 data->arg.lock_seqid);
4855                 if (!IS_ERR(task))
4856                         rpc_put_task_async(task);
4857                 dprintk("%s: cancelling lock!\n", __func__);
4858         } else
4859                 nfs_free_seqid(data->arg.lock_seqid);
4860         nfs4_put_lock_state(data->lsp);
4861         put_nfs_open_context(data->ctx);
4862         kfree(data);
4863         dprintk("%s: done!\n", __func__);
4864 }
4865
4866 static const struct rpc_call_ops nfs4_lock_ops = {
4867         .rpc_call_prepare = nfs4_lock_prepare,
4868         .rpc_call_done = nfs4_lock_done,
4869         .rpc_release = nfs4_lock_release,
4870 };
4871
4872 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4873 {
4874         switch (error) {
4875         case -NFS4ERR_ADMIN_REVOKED:
4876         case -NFS4ERR_BAD_STATEID:
4877                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4878                 if (new_lock_owner != 0 ||
4879                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
4880                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4881                 break;
4882         case -NFS4ERR_STALE_STATEID:
4883                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4884         case -NFS4ERR_EXPIRED:
4885                 nfs4_schedule_lease_recovery(server->nfs_client);
4886         };
4887 }
4888
4889 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4890 {
4891         struct nfs4_lockdata *data;
4892         struct rpc_task *task;
4893         struct rpc_message msg = {
4894                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4895                 .rpc_cred = state->owner->so_cred,
4896         };
4897         struct rpc_task_setup task_setup_data = {
4898                 .rpc_client = NFS_CLIENT(state->inode),
4899                 .rpc_message = &msg,
4900                 .callback_ops = &nfs4_lock_ops,
4901                 .workqueue = nfsiod_workqueue,
4902                 .flags = RPC_TASK_ASYNC,
4903         };
4904         int ret;
4905
4906         dprintk("%s: begin!\n", __func__);
4907         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4908                         fl->fl_u.nfs4_fl.owner,
4909                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4910         if (data == NULL)
4911                 return -ENOMEM;
4912         if (IS_SETLKW(cmd))
4913                 data->arg.block = 1;
4914         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4915         msg.rpc_argp = &data->arg;
4916         msg.rpc_resp = &data->res;
4917         task_setup_data.callback_data = data;
4918         if (recovery_type > NFS_LOCK_NEW) {
4919                 if (recovery_type == NFS_LOCK_RECLAIM)
4920                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4921                 nfs4_set_sequence_privileged(&data->arg.seq_args);
4922         }
4923         task = rpc_run_task(&task_setup_data);
4924         if (IS_ERR(task))
4925                 return PTR_ERR(task);
4926         ret = nfs4_wait_for_completion_rpc_task(task);
4927         if (ret == 0) {
4928                 ret = data->rpc_status;
4929                 if (ret)
4930                         nfs4_handle_setlk_error(data->server, data->lsp,
4931                                         data->arg.new_lock_owner, ret);
4932         } else
4933                 data->cancelled = 1;
4934         rpc_put_task(task);
4935         dprintk("%s: done, ret = %d!\n", __func__, ret);
4936         return ret;
4937 }
4938
4939 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4940 {
4941         struct nfs_server *server = NFS_SERVER(state->inode);
4942         struct nfs4_exception exception = {
4943                 .inode = state->inode,
4944         };
4945         int err;
4946
4947         do {
4948                 /* Cache the lock if possible... */
4949                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4950                         return 0;
4951                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4952                 if (err != -NFS4ERR_DELAY)
4953                         break;
4954                 nfs4_handle_exception(server, err, &exception);
4955         } while (exception.retry);
4956         return err;
4957 }
4958
4959 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4960 {
4961         struct nfs_server *server = NFS_SERVER(state->inode);
4962         struct nfs4_exception exception = {
4963                 .inode = state->inode,
4964         };
4965         int err;
4966
4967         err = nfs4_set_lock_state(state, request);
4968         if (err != 0)
4969                 return err;
4970         do {
4971                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4972                         return 0;
4973                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4974                 switch (err) {
4975                 default:
4976                         goto out;
4977                 case -NFS4ERR_GRACE:
4978                 case -NFS4ERR_DELAY:
4979                         nfs4_handle_exception(server, err, &exception);
4980                         err = 0;
4981                 }
4982         } while (exception.retry);
4983 out:
4984         return err;
4985 }
4986
4987 #if defined(CONFIG_NFS_V4_1)
4988 /**
4989  * nfs41_check_expired_locks - possibly free a lock stateid
4990  *
4991  * @state: NFSv4 state for an inode
4992  *
4993  * Returns NFS_OK if recovery for this stateid is now finished.
4994  * Otherwise a negative NFS4ERR value is returned.
4995  */
4996 static int nfs41_check_expired_locks(struct nfs4_state *state)
4997 {
4998         int status, ret = -NFS4ERR_BAD_STATEID;
4999         struct nfs4_lock_state *lsp;
5000         struct nfs_server *server = NFS_SERVER(state->inode);
5001
5002         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
5003                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
5004                         status = nfs41_test_stateid(server, &lsp->ls_stateid);
5005                         if (status != NFS_OK) {
5006                                 /* Free the stateid unless the server
5007                                  * informs us the stateid is unrecognized. */
5008                                 if (status != -NFS4ERR_BAD_STATEID)
5009                                         nfs41_free_stateid(server,
5010                                                         &lsp->ls_stateid);
5011                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
5012                                 ret = status;
5013                         }
5014                 }
5015         };
5016
5017         return ret;
5018 }
5019
5020 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
5021 {
5022         int status = NFS_OK;
5023
5024         if (test_bit(LK_STATE_IN_USE, &state->flags))
5025                 status = nfs41_check_expired_locks(state);
5026         if (status != NFS_OK)
5027                 status = nfs4_lock_expired(state, request);
5028         return status;
5029 }
5030 #endif
5031
5032 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5033 {
5034         struct nfs4_state_owner *sp = state->owner;
5035         struct nfs_inode *nfsi = NFS_I(state->inode);
5036         unsigned char fl_flags = request->fl_flags;
5037         unsigned int seq;
5038         int status = -ENOLCK;
5039
5040         if ((fl_flags & FL_POSIX) &&
5041                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
5042                 goto out;
5043         /* Is this a delegated open? */
5044         status = nfs4_set_lock_state(state, request);
5045         if (status != 0)
5046                 goto out;
5047         request->fl_flags |= FL_ACCESS;
5048         status = do_vfs_lock(request->fl_file, request);
5049         if (status < 0)
5050                 goto out;
5051         down_read(&nfsi->rwsem);
5052         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
5053                 /* Yes: cache locks! */
5054                 /* ...but avoid races with delegation recall... */
5055                 request->fl_flags = fl_flags & ~FL_SLEEP;
5056                 status = do_vfs_lock(request->fl_file, request);
5057                 goto out_unlock;
5058         }
5059         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
5060         up_read(&nfsi->rwsem);
5061         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
5062         if (status != 0)
5063                 goto out;
5064         down_read(&nfsi->rwsem);
5065         if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) {
5066                 status = -NFS4ERR_DELAY;
5067                 goto out_unlock;
5068         }
5069         /* Note: we always want to sleep here! */
5070         request->fl_flags = fl_flags | FL_SLEEP;
5071         if (do_vfs_lock(request->fl_file, request) < 0)
5072                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
5073                         "manager!\n", __func__);
5074 out_unlock:
5075         up_read(&nfsi->rwsem);
5076 out:
5077         request->fl_flags = fl_flags;
5078         return status;
5079 }
5080
5081 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5082 {
5083         struct nfs4_exception exception = {
5084                 .state = state,
5085                 .inode = state->inode,
5086         };
5087         int err;
5088
5089         do {
5090                 err = _nfs4_proc_setlk(state, cmd, request);
5091                 if (err == -NFS4ERR_DENIED)
5092                         err = -EAGAIN;
5093                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
5094                                 err, &exception);
5095         } while (exception.retry);
5096         return err;
5097 }
5098
5099 static int
5100 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
5101 {
5102         struct nfs_open_context *ctx;
5103         struct nfs4_state *state;
5104         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
5105         int status;
5106
5107         /* verify open state */
5108         ctx = nfs_file_open_context(filp);
5109         state = ctx->state;
5110
5111         if (request->fl_start < 0 || request->fl_end < 0)
5112                 return -EINVAL;
5113
5114         if (IS_GETLK(cmd)) {
5115                 if (state != NULL)
5116                         return nfs4_proc_getlk(state, F_GETLK, request);
5117                 return 0;
5118         }
5119
5120         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
5121                 return -EINVAL;
5122
5123         if (request->fl_type == F_UNLCK) {
5124                 if (state != NULL)
5125                         return nfs4_proc_unlck(state, cmd, request);
5126                 return 0;
5127         }
5128
5129         if (state == NULL)
5130                 return -ENOLCK;
5131         /*
5132          * Don't rely on the VFS having checked the file open mode,
5133          * since it won't do this for flock() locks.
5134          */
5135         switch (request->fl_type) {
5136         case F_RDLCK:
5137                 if (!(filp->f_mode & FMODE_READ))
5138                         return -EBADF;
5139                 break;
5140         case F_WRLCK:
5141                 if (!(filp->f_mode & FMODE_WRITE))
5142                         return -EBADF;
5143         }
5144
5145         do {
5146                 status = nfs4_proc_setlk(state, cmd, request);
5147                 if ((status != -EAGAIN) || IS_SETLK(cmd))
5148                         break;
5149                 timeout = nfs4_set_lock_task_retry(timeout);
5150                 status = -ERESTARTSYS;
5151                 if (signalled())
5152                         break;
5153         } while(status < 0);
5154         return status;
5155 }
5156
5157 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
5158 {
5159         struct nfs_server *server = NFS_SERVER(state->inode);
5160         int err;
5161
5162         err = nfs4_set_lock_state(state, fl);
5163         if (err != 0)
5164                 return err;
5165         err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
5166         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
5167 }
5168
5169 struct nfs_release_lockowner_data {
5170         struct nfs4_lock_state *lsp;
5171         struct nfs_server *server;
5172         struct nfs_release_lockowner_args args;
5173 };
5174
5175 static void nfs4_release_lockowner_release(void *calldata)
5176 {
5177         struct nfs_release_lockowner_data *data = calldata;
5178         nfs4_free_lock_state(data->server, data->lsp);
5179         kfree(calldata);
5180 }
5181
5182 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
5183         .rpc_release = nfs4_release_lockowner_release,
5184 };
5185
5186 int nfs4_release_lockowner(struct nfs4_lock_state *lsp)
5187 {
5188         struct nfs_server *server = lsp->ls_state->owner->so_server;
5189         struct nfs_release_lockowner_data *data;
5190         struct rpc_message msg = {
5191                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
5192         };
5193
5194         if (server->nfs_client->cl_mvops->minor_version != 0)
5195                 return -EINVAL;
5196         data = kmalloc(sizeof(*data), GFP_NOFS);
5197         if (!data)
5198                 return -ENOMEM;
5199         data->lsp = lsp;
5200         data->server = server;
5201         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
5202         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
5203         data->args.lock_owner.s_dev = server->s_dev;
5204         msg.rpc_argp = &data->args;
5205         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
5206         return 0;
5207 }
5208
5209 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
5210
5211 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
5212                                    const void *buf, size_t buflen,
5213                                    int flags, int type)
5214 {
5215         if (strcmp(key, "") != 0)
5216                 return -EINVAL;
5217
5218         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
5219 }
5220
5221 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
5222                                    void *buf, size_t buflen, int type)
5223 {
5224         if (strcmp(key, "") != 0)
5225                 return -EINVAL;
5226
5227         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
5228 }
5229
5230 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
5231                                        size_t list_len, const char *name,
5232                                        size_t name_len, int type)
5233 {
5234         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
5235
5236         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
5237                 return 0;
5238
5239         if (list && len <= list_len)
5240                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
5241         return len;
5242 }
5243
5244 /*
5245  * nfs_fhget will use either the mounted_on_fileid or the fileid
5246  */
5247 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
5248 {
5249         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
5250                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
5251               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
5252               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
5253                 return;
5254
5255         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
5256                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
5257         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
5258         fattr->nlink = 2;
5259 }
5260
5261 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5262                                    const struct qstr *name,
5263                                    struct nfs4_fs_locations *fs_locations,
5264                                    struct page *page)
5265 {
5266         struct nfs_server *server = NFS_SERVER(dir);
5267         u32 bitmask[2] = {
5268                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
5269         };
5270         struct nfs4_fs_locations_arg args = {
5271                 .dir_fh = NFS_FH(dir),
5272                 .name = name,
5273                 .page = page,
5274                 .bitmask = bitmask,
5275         };
5276         struct nfs4_fs_locations_res res = {
5277                 .fs_locations = fs_locations,
5278         };
5279         struct rpc_message msg = {
5280                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
5281                 .rpc_argp = &args,
5282                 .rpc_resp = &res,
5283         };
5284         int status;
5285
5286         dprintk("%s: start\n", __func__);
5287
5288         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
5289          * is not supported */
5290         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
5291                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
5292         else
5293                 bitmask[0] |= FATTR4_WORD0_FILEID;
5294
5295         nfs_fattr_init(&fs_locations->fattr);
5296         fs_locations->server = server;
5297         fs_locations->nlocations = 0;
5298         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
5299         dprintk("%s: returned status = %d\n", __func__, status);
5300         return status;
5301 }
5302
5303 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5304                            const struct qstr *name,
5305                            struct nfs4_fs_locations *fs_locations,
5306                            struct page *page)
5307 {
5308         struct nfs4_exception exception = { };
5309         int err;
5310         do {
5311                 err = nfs4_handle_exception(NFS_SERVER(dir),
5312                                 _nfs4_proc_fs_locations(client, dir, name, fs_locations, page),
5313                                 &exception);
5314         } while (exception.retry);
5315         return err;
5316 }
5317
5318 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
5319 {
5320         int status;
5321         struct nfs4_secinfo_arg args = {
5322                 .dir_fh = NFS_FH(dir),
5323                 .name   = name,
5324         };
5325         struct nfs4_secinfo_res res = {
5326                 .flavors     = flavors,
5327         };
5328         struct rpc_message msg = {
5329                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
5330                 .rpc_argp = &args,
5331                 .rpc_resp = &res,
5332         };
5333
5334         dprintk("NFS call  secinfo %s\n", name->name);
5335         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
5336         dprintk("NFS reply  secinfo: %d\n", status);
5337         return status;
5338 }
5339
5340 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
5341                       struct nfs4_secinfo_flavors *flavors)
5342 {
5343         struct nfs4_exception exception = { };
5344         int err;
5345         do {
5346                 err = nfs4_handle_exception(NFS_SERVER(dir),
5347                                 _nfs4_proc_secinfo(dir, name, flavors),
5348                                 &exception);
5349         } while (exception.retry);
5350         return err;
5351 }
5352
5353 #ifdef CONFIG_NFS_V4_1
5354 /*
5355  * Check the exchange flags returned by the server for invalid flags, having
5356  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
5357  * DS flags set.
5358  */
5359 static int nfs4_check_cl_exchange_flags(u32 flags)
5360 {
5361         if (flags & ~EXCHGID4_FLAG_MASK_R)
5362                 goto out_inval;
5363         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
5364             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
5365                 goto out_inval;
5366         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
5367                 goto out_inval;
5368         return NFS_OK;
5369 out_inval:
5370         return -NFS4ERR_INVAL;
5371 }
5372
5373 static bool
5374 nfs41_same_server_scope(struct nfs41_server_scope *a,
5375                         struct nfs41_server_scope *b)
5376 {
5377         if (a->server_scope_sz == b->server_scope_sz &&
5378             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
5379                 return true;
5380
5381         return false;
5382 }
5383
5384 /*
5385  * nfs4_proc_bind_conn_to_session()
5386  *
5387  * The 4.1 client currently uses the same TCP connection for the
5388  * fore and backchannel.
5389  */
5390 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
5391 {
5392         int status;
5393         struct nfs41_bind_conn_to_session_res res;
5394         struct rpc_message msg = {
5395                 .rpc_proc =
5396                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
5397                 .rpc_argp = clp,
5398                 .rpc_resp = &res,
5399                 .rpc_cred = cred,
5400         };
5401
5402         dprintk("--> %s\n", __func__);
5403
5404         res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5405         if (unlikely(res.session == NULL)) {
5406                 status = -ENOMEM;
5407                 goto out;
5408         }
5409
5410         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5411         if (status == 0) {
5412                 if (memcmp(res.session->sess_id.data,
5413                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
5414                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
5415                         status = -EIO;
5416                         goto out_session;
5417                 }
5418                 if (res.dir != NFS4_CDFS4_BOTH) {
5419                         dprintk("NFS: %s: Unexpected direction from server\n",
5420                                 __func__);
5421                         status = -EIO;
5422                         goto out_session;
5423                 }
5424                 if (res.use_conn_in_rdma_mode) {
5425                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
5426                                 __func__);
5427                         status = -EIO;
5428                         goto out_session;
5429                 }
5430         }
5431 out_session:
5432         kfree(res.session);
5433 out:
5434         dprintk("<-- %s status= %d\n", __func__, status);
5435         return status;
5436 }
5437
5438 /*
5439  * nfs4_proc_exchange_id()
5440  *
5441  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5442  *
5443  * Since the clientid has expired, all compounds using sessions
5444  * associated with the stale clientid will be returning
5445  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
5446  * be in some phase of session reset.
5447  */
5448 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
5449 {
5450         nfs4_verifier verifier;
5451         struct nfs41_exchange_id_args args = {
5452                 .verifier = &verifier,
5453                 .client = clp,
5454                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
5455         };
5456         struct nfs41_exchange_id_res res = {
5457                 0
5458         };
5459         int status;
5460         struct rpc_message msg = {
5461                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
5462                 .rpc_argp = &args,
5463                 .rpc_resp = &res,
5464                 .rpc_cred = cred,
5465         };
5466
5467         nfs4_init_boot_verifier(clp, &verifier);
5468         args.id_len = nfs4_init_uniform_client_string(clp, args.id,
5469                                                         sizeof(args.id));
5470         dprintk("NFS call  exchange_id auth=%s, '%.*s'\n",
5471                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5472                 args.id_len, args.id);
5473
5474         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
5475                                         GFP_NOFS);
5476         if (unlikely(res.server_owner == NULL)) {
5477                 status = -ENOMEM;
5478                 goto out;
5479         }
5480
5481         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
5482                                         GFP_NOFS);
5483         if (unlikely(res.server_scope == NULL)) {
5484                 status = -ENOMEM;
5485                 goto out_server_owner;
5486         }
5487
5488         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
5489         if (unlikely(res.impl_id == NULL)) {
5490                 status = -ENOMEM;
5491                 goto out_server_scope;
5492         }
5493
5494         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5495         if (status == 0)
5496                 status = nfs4_check_cl_exchange_flags(res.flags);
5497
5498         if (status == 0) {
5499                 clp->cl_clientid = res.clientid;
5500                 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
5501                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
5502                         clp->cl_seqid = res.seqid;
5503
5504                 kfree(clp->cl_serverowner);
5505                 clp->cl_serverowner = res.server_owner;
5506                 res.server_owner = NULL;
5507
5508                 /* use the most recent implementation id */
5509                 kfree(clp->cl_implid);
5510                 clp->cl_implid = res.impl_id;
5511
5512                 if (clp->cl_serverscope != NULL &&
5513                     !nfs41_same_server_scope(clp->cl_serverscope,
5514                                              res.server_scope)) {
5515                         dprintk("%s: server_scope mismatch detected\n",
5516                                 __func__);
5517                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
5518                         kfree(clp->cl_serverscope);
5519                         clp->cl_serverscope = NULL;
5520                 }
5521
5522                 if (clp->cl_serverscope == NULL) {
5523                         clp->cl_serverscope = res.server_scope;
5524                         goto out;
5525                 }
5526         } else
5527                 kfree(res.impl_id);
5528
5529 out_server_owner:
5530         kfree(res.server_owner);
5531 out_server_scope:
5532         kfree(res.server_scope);
5533 out:
5534         if (clp->cl_implid != NULL)
5535                 dprintk("NFS reply exchange_id: Server Implementation ID: "
5536                         "domain: %s, name: %s, date: %llu,%u\n",
5537                         clp->cl_implid->domain, clp->cl_implid->name,
5538                         clp->cl_implid->date.seconds,
5539                         clp->cl_implid->date.nseconds);
5540         dprintk("NFS reply exchange_id: %d\n", status);
5541         return status;
5542 }
5543
5544 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
5545                 struct rpc_cred *cred)
5546 {
5547         struct rpc_message msg = {
5548                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
5549                 .rpc_argp = clp,
5550                 .rpc_cred = cred,
5551         };
5552         int status;
5553
5554         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5555         if (status)
5556                 dprintk("NFS: Got error %d from the server %s on "
5557                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
5558         return status;
5559 }
5560
5561 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
5562                 struct rpc_cred *cred)
5563 {
5564         unsigned int loop;
5565         int ret;
5566
5567         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
5568                 ret = _nfs4_proc_destroy_clientid(clp, cred);
5569                 switch (ret) {
5570                 case -NFS4ERR_DELAY:
5571                 case -NFS4ERR_CLIENTID_BUSY:
5572                         ssleep(1);
5573                         break;
5574                 default:
5575                         return ret;
5576                 }
5577         }
5578         return 0;
5579 }
5580
5581 int nfs4_destroy_clientid(struct nfs_client *clp)
5582 {
5583         struct rpc_cred *cred;
5584         int ret = 0;
5585
5586         if (clp->cl_mvops->minor_version < 1)
5587                 goto out;
5588         if (clp->cl_exchange_flags == 0)
5589                 goto out;
5590         if (clp->cl_preserve_clid)
5591                 goto out;
5592         cred = nfs4_get_exchange_id_cred(clp);
5593         ret = nfs4_proc_destroy_clientid(clp, cred);
5594         if (cred)
5595                 put_rpccred(cred);
5596         switch (ret) {
5597         case 0:
5598         case -NFS4ERR_STALE_CLIENTID:
5599                 clp->cl_exchange_flags = 0;
5600         }
5601 out:
5602         return ret;
5603 }
5604
5605 struct nfs4_get_lease_time_data {
5606         struct nfs4_get_lease_time_args *args;
5607         struct nfs4_get_lease_time_res *res;
5608         struct nfs_client *clp;
5609 };
5610
5611 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
5612                                         void *calldata)
5613 {
5614         struct nfs4_get_lease_time_data *data =
5615                         (struct nfs4_get_lease_time_data *)calldata;
5616
5617         dprintk("--> %s\n", __func__);
5618         /* just setup sequence, do not trigger session recovery
5619            since we're invoked within one */
5620         nfs41_setup_sequence(data->clp->cl_session,
5621                         &data->args->la_seq_args,
5622                         &data->res->lr_seq_res,
5623                         task);
5624         dprintk("<-- %s\n", __func__);
5625 }
5626
5627 /*
5628  * Called from nfs4_state_manager thread for session setup, so don't recover
5629  * from sequence operation or clientid errors.
5630  */
5631 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
5632 {
5633         struct nfs4_get_lease_time_data *data =
5634                         (struct nfs4_get_lease_time_data *)calldata;
5635
5636         dprintk("--> %s\n", __func__);
5637         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
5638                 return;
5639         switch (task->tk_status) {
5640         case -NFS4ERR_DELAY:
5641         case -NFS4ERR_GRACE:
5642                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
5643                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
5644                 task->tk_status = 0;
5645                 /* fall through */
5646         case -NFS4ERR_RETRY_UNCACHED_REP:
5647                 rpc_restart_call_prepare(task);
5648                 return;
5649         }
5650         dprintk("<-- %s\n", __func__);
5651 }
5652
5653 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
5654         .rpc_call_prepare = nfs4_get_lease_time_prepare,
5655         .rpc_call_done = nfs4_get_lease_time_done,
5656 };
5657
5658 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
5659 {
5660         struct rpc_task *task;
5661         struct nfs4_get_lease_time_args args;
5662         struct nfs4_get_lease_time_res res = {
5663                 .lr_fsinfo = fsinfo,
5664         };
5665         struct nfs4_get_lease_time_data data = {
5666                 .args = &args,
5667                 .res = &res,
5668                 .clp = clp,
5669         };
5670         struct rpc_message msg = {
5671                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
5672                 .rpc_argp = &args,
5673                 .rpc_resp = &res,
5674         };
5675         struct rpc_task_setup task_setup = {
5676                 .rpc_client = clp->cl_rpcclient,
5677                 .rpc_message = &msg,
5678                 .callback_ops = &nfs4_get_lease_time_ops,
5679                 .callback_data = &data,
5680                 .flags = RPC_TASK_TIMEOUT,
5681         };
5682         int status;
5683
5684         nfs41_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
5685         nfs4_set_sequence_privileged(&args.la_seq_args);
5686         dprintk("--> %s\n", __func__);
5687         task = rpc_run_task(&task_setup);
5688
5689         if (IS_ERR(task))
5690                 status = PTR_ERR(task);
5691         else {
5692                 status = task->tk_status;
5693                 rpc_put_task(task);
5694         }
5695         dprintk("<-- %s return %d\n", __func__, status);
5696
5697         return status;
5698 }
5699
5700 /*
5701  * Initialize the values to be used by the client in CREATE_SESSION
5702  * If nfs4_init_session set the fore channel request and response sizes,
5703  * use them.
5704  *
5705  * Set the back channel max_resp_sz_cached to zero to force the client to
5706  * always set csa_cachethis to FALSE because the current implementation
5707  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5708  */
5709 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5710 {
5711         struct nfs4_session *session = args->client->cl_session;
5712         unsigned int mxrqst_sz = session->fc_target_max_rqst_sz,
5713                      mxresp_sz = session->fc_target_max_resp_sz;
5714
5715         if (mxrqst_sz == 0)
5716                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5717         if (mxresp_sz == 0)
5718                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5719         /* Fore channel attributes */
5720         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5721         args->fc_attrs.max_resp_sz = mxresp_sz;
5722         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5723         args->fc_attrs.max_reqs = max_session_slots;
5724
5725         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5726                 "max_ops=%u max_reqs=%u\n",
5727                 __func__,
5728                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5729                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5730
5731         /* Back channel attributes */
5732         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5733         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5734         args->bc_attrs.max_resp_sz_cached = 0;
5735         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5736         args->bc_attrs.max_reqs = 1;
5737
5738         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5739                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5740                 __func__,
5741                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5742                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5743                 args->bc_attrs.max_reqs);
5744 }
5745
5746 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5747 {
5748         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5749         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5750
5751         if (rcvd->max_resp_sz > sent->max_resp_sz)
5752                 return -EINVAL;
5753         /*
5754          * Our requested max_ops is the minimum we need; we're not
5755          * prepared to break up compounds into smaller pieces than that.
5756          * So, no point even trying to continue if the server won't
5757          * cooperate:
5758          */
5759         if (rcvd->max_ops < sent->max_ops)
5760                 return -EINVAL;
5761         if (rcvd->max_reqs == 0)
5762                 return -EINVAL;
5763         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
5764                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
5765         return 0;
5766 }
5767
5768 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5769 {
5770         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5771         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5772
5773         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5774                 return -EINVAL;
5775         if (rcvd->max_resp_sz < sent->max_resp_sz)
5776                 return -EINVAL;
5777         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5778                 return -EINVAL;
5779         /* These would render the backchannel useless: */
5780         if (rcvd->max_ops != sent->max_ops)
5781                 return -EINVAL;
5782         if (rcvd->max_reqs != sent->max_reqs)
5783                 return -EINVAL;
5784         return 0;
5785 }
5786
5787 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5788                                      struct nfs4_session *session)
5789 {
5790         int ret;
5791
5792         ret = nfs4_verify_fore_channel_attrs(args, session);
5793         if (ret)
5794                 return ret;
5795         return nfs4_verify_back_channel_attrs(args, session);
5796 }
5797
5798 static int _nfs4_proc_create_session(struct nfs_client *clp,
5799                 struct rpc_cred *cred)
5800 {
5801         struct nfs4_session *session = clp->cl_session;
5802         struct nfs41_create_session_args args = {
5803                 .client = clp,
5804                 .cb_program = NFS4_CALLBACK,
5805         };
5806         struct nfs41_create_session_res res = {
5807                 .client = clp,
5808         };
5809         struct rpc_message msg = {
5810                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5811                 .rpc_argp = &args,
5812                 .rpc_resp = &res,
5813                 .rpc_cred = cred,
5814         };
5815         int status;
5816
5817         nfs4_init_channel_attrs(&args);
5818         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5819
5820         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5821
5822         if (!status) {
5823                 /* Verify the session's negotiated channel_attrs values */
5824                 status = nfs4_verify_channel_attrs(&args, session);
5825                 /* Increment the clientid slot sequence id */
5826                 clp->cl_seqid++;
5827         }
5828
5829         return status;
5830 }
5831
5832 /*
5833  * Issues a CREATE_SESSION operation to the server.
5834  * It is the responsibility of the caller to verify the session is
5835  * expired before calling this routine.
5836  */
5837 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
5838 {
5839         int status;
5840         unsigned *ptr;
5841         struct nfs4_session *session = clp->cl_session;
5842
5843         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5844
5845         status = _nfs4_proc_create_session(clp, cred);
5846         if (status)
5847                 goto out;
5848
5849         /* Init or reset the session slot tables */
5850         status = nfs4_setup_session_slot_tables(session);
5851         dprintk("slot table setup returned %d\n", status);
5852         if (status)
5853                 goto out;
5854
5855         ptr = (unsigned *)&session->sess_id.data[0];
5856         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5857                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5858 out:
5859         dprintk("<-- %s\n", __func__);
5860         return status;
5861 }
5862
5863 /*
5864  * Issue the over-the-wire RPC DESTROY_SESSION.
5865  * The caller must serialize access to this routine.
5866  */
5867 int nfs4_proc_destroy_session(struct nfs4_session *session,
5868                 struct rpc_cred *cred)
5869 {
5870         struct rpc_message msg = {
5871                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
5872                 .rpc_argp = session,
5873                 .rpc_cred = cred,
5874         };
5875         int status = 0;
5876
5877         dprintk("--> nfs4_proc_destroy_session\n");
5878
5879         /* session is still being setup */
5880         if (session->clp->cl_cons_state != NFS_CS_READY)
5881                 return status;
5882
5883         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5884
5885         if (status)
5886                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
5887                         "Session has been destroyed regardless...\n", status);
5888
5889         dprintk("<-- nfs4_proc_destroy_session\n");
5890         return status;
5891 }
5892
5893 /*
5894  * Renew the cl_session lease.
5895  */
5896 struct nfs4_sequence_data {
5897         struct nfs_client *clp;
5898         struct nfs4_sequence_args args;
5899         struct nfs4_sequence_res res;
5900 };
5901
5902 static void nfs41_sequence_release(void *data)
5903 {
5904         struct nfs4_sequence_data *calldata = data;
5905         struct nfs_client *clp = calldata->clp;
5906
5907         if (atomic_read(&clp->cl_count) > 1)
5908                 nfs4_schedule_state_renewal(clp);
5909         nfs_put_client(clp);
5910         kfree(calldata);
5911 }
5912
5913 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5914 {
5915         switch(task->tk_status) {
5916         case -NFS4ERR_DELAY:
5917                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5918                 return -EAGAIN;
5919         default:
5920                 nfs4_schedule_lease_recovery(clp);
5921         }
5922         return 0;
5923 }
5924
5925 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5926 {
5927         struct nfs4_sequence_data *calldata = data;
5928         struct nfs_client *clp = calldata->clp;
5929
5930         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5931                 return;
5932
5933         if (task->tk_status < 0) {
5934                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5935                 if (atomic_read(&clp->cl_count) == 1)
5936                         goto out;
5937
5938                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5939                         rpc_restart_call_prepare(task);
5940                         return;
5941                 }
5942         }
5943         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5944 out:
5945         dprintk("<-- %s\n", __func__);
5946 }
5947
5948 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5949 {
5950         struct nfs4_sequence_data *calldata = data;
5951         struct nfs_client *clp = calldata->clp;
5952         struct nfs4_sequence_args *args;
5953         struct nfs4_sequence_res *res;
5954
5955         args = task->tk_msg.rpc_argp;
5956         res = task->tk_msg.rpc_resp;
5957
5958         nfs41_setup_sequence(clp->cl_session, args, res, task);
5959 }
5960
5961 static const struct rpc_call_ops nfs41_sequence_ops = {
5962         .rpc_call_done = nfs41_sequence_call_done,
5963         .rpc_call_prepare = nfs41_sequence_prepare,
5964         .rpc_release = nfs41_sequence_release,
5965 };
5966
5967 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
5968                 struct rpc_cred *cred,
5969                 bool is_privileged)
5970 {
5971         struct nfs4_sequence_data *calldata;
5972         struct rpc_message msg = {
5973                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5974                 .rpc_cred = cred,
5975         };
5976         struct rpc_task_setup task_setup_data = {
5977                 .rpc_client = clp->cl_rpcclient,
5978                 .rpc_message = &msg,
5979                 .callback_ops = &nfs41_sequence_ops,
5980                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
5981         };
5982
5983         if (!atomic_inc_not_zero(&clp->cl_count))
5984                 return ERR_PTR(-EIO);
5985         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5986         if (calldata == NULL) {
5987                 nfs_put_client(clp);
5988                 return ERR_PTR(-ENOMEM);
5989         }
5990         nfs41_init_sequence(&calldata->args, &calldata->res, 0);
5991         if (is_privileged)
5992                 nfs4_set_sequence_privileged(&calldata->args);
5993         msg.rpc_argp = &calldata->args;
5994         msg.rpc_resp = &calldata->res;
5995         calldata->clp = clp;
5996         task_setup_data.callback_data = calldata;
5997
5998         return rpc_run_task(&task_setup_data);
5999 }
6000
6001 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
6002 {
6003         struct rpc_task *task;
6004         int ret = 0;
6005
6006         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
6007                 return 0;
6008         task = _nfs41_proc_sequence(clp, cred, false);
6009         if (IS_ERR(task))
6010                 ret = PTR_ERR(task);
6011         else
6012                 rpc_put_task_async(task);
6013         dprintk("<-- %s status=%d\n", __func__, ret);
6014         return ret;
6015 }
6016
6017 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
6018 {
6019         struct rpc_task *task;
6020         int ret;
6021
6022         task = _nfs41_proc_sequence(clp, cred, true);
6023         if (IS_ERR(task)) {
6024                 ret = PTR_ERR(task);
6025                 goto out;
6026         }
6027         ret = rpc_wait_for_completion_task(task);
6028         if (!ret) {
6029                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
6030
6031                 if (task->tk_status == 0)
6032                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
6033                 ret = task->tk_status;
6034         }
6035         rpc_put_task(task);
6036 out:
6037         dprintk("<-- %s status=%d\n", __func__, ret);
6038         return ret;
6039 }
6040
6041 struct nfs4_reclaim_complete_data {
6042         struct nfs_client *clp;
6043         struct nfs41_reclaim_complete_args arg;
6044         struct nfs41_reclaim_complete_res res;
6045 };
6046
6047 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
6048 {
6049         struct nfs4_reclaim_complete_data *calldata = data;
6050
6051         nfs41_setup_sequence(calldata->clp->cl_session,
6052                         &calldata->arg.seq_args,
6053                         &calldata->res.seq_res,
6054                         task);
6055 }
6056
6057 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
6058 {
6059         switch(task->tk_status) {
6060         case 0:
6061         case -NFS4ERR_COMPLETE_ALREADY:
6062         case -NFS4ERR_WRONG_CRED: /* What to do here? */
6063                 break;
6064         case -NFS4ERR_DELAY:
6065                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
6066                 /* fall through */
6067         case -NFS4ERR_RETRY_UNCACHED_REP:
6068                 return -EAGAIN;
6069         default:
6070                 nfs4_schedule_lease_recovery(clp);
6071         }
6072         return 0;
6073 }
6074
6075 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
6076 {
6077         struct nfs4_reclaim_complete_data *calldata = data;
6078         struct nfs_client *clp = calldata->clp;
6079         struct nfs4_sequence_res *res = &calldata->res.seq_res;
6080
6081         dprintk("--> %s\n", __func__);
6082         if (!nfs41_sequence_done(task, res))
6083                 return;
6084
6085         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
6086                 rpc_restart_call_prepare(task);
6087                 return;
6088         }
6089         dprintk("<-- %s\n", __func__);
6090 }
6091
6092 static void nfs4_free_reclaim_complete_data(void *data)
6093 {
6094         struct nfs4_reclaim_complete_data *calldata = data;
6095
6096         kfree(calldata);
6097 }
6098
6099 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
6100         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
6101         .rpc_call_done = nfs4_reclaim_complete_done,
6102         .rpc_release = nfs4_free_reclaim_complete_data,
6103 };
6104
6105 /*
6106  * Issue a global reclaim complete.
6107  */
6108 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
6109 {
6110         struct nfs4_reclaim_complete_data *calldata;
6111         struct rpc_task *task;
6112         struct rpc_message msg = {
6113                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
6114         };
6115         struct rpc_task_setup task_setup_data = {
6116                 .rpc_client = clp->cl_rpcclient,
6117                 .rpc_message = &msg,
6118                 .callback_ops = &nfs4_reclaim_complete_call_ops,
6119                 .flags = RPC_TASK_ASYNC,
6120         };
6121         int status = -ENOMEM;
6122
6123         dprintk("--> %s\n", __func__);
6124         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
6125         if (calldata == NULL)
6126                 goto out;
6127         calldata->clp = clp;
6128         calldata->arg.one_fs = 0;
6129
6130         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
6131         nfs4_set_sequence_privileged(&calldata->arg.seq_args);
6132         msg.rpc_argp = &calldata->arg;
6133         msg.rpc_resp = &calldata->res;
6134         task_setup_data.callback_data = calldata;
6135         task = rpc_run_task(&task_setup_data);
6136         if (IS_ERR(task)) {
6137                 status = PTR_ERR(task);
6138                 goto out;
6139         }
6140         status = nfs4_wait_for_completion_rpc_task(task);
6141         if (status == 0)
6142                 status = task->tk_status;
6143         rpc_put_task(task);
6144         return 0;
6145 out:
6146         dprintk("<-- %s status=%d\n", __func__, status);
6147         return status;
6148 }
6149
6150 static void
6151 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
6152 {
6153         struct nfs4_layoutget *lgp = calldata;
6154         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6155         struct nfs4_session *session = nfs4_get_session(server);
6156
6157         dprintk("--> %s\n", __func__);
6158         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
6159          * right now covering the LAYOUTGET we are about to send.
6160          * However, that is not so catastrophic, and there seems
6161          * to be no way to prevent it completely.
6162          */
6163         if (nfs41_setup_sequence(session, &lgp->args.seq_args,
6164                                 &lgp->res.seq_res, task))
6165                 return;
6166         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
6167                                           NFS_I(lgp->args.inode)->layout,
6168                                           lgp->args.ctx->state)) {
6169                 rpc_exit(task, NFS4_OK);
6170         }
6171 }
6172
6173 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
6174 {
6175         struct nfs4_layoutget *lgp = calldata;
6176         struct inode *inode = lgp->args.inode;
6177         struct nfs_server *server = NFS_SERVER(inode);
6178         struct pnfs_layout_hdr *lo;
6179         struct nfs4_state *state = NULL;
6180         unsigned long timeo, giveup;
6181
6182         dprintk("--> %s\n", __func__);
6183
6184         if (!nfs41_sequence_done(task, &lgp->res.seq_res))
6185                 goto out;
6186
6187         switch (task->tk_status) {
6188         case 0:
6189                 goto out;
6190         case -NFS4ERR_LAYOUTTRYLATER:
6191         case -NFS4ERR_RECALLCONFLICT:
6192                 timeo = rpc_get_timeout(task->tk_client);
6193                 giveup = lgp->args.timestamp + timeo;
6194                 if (time_after(giveup, jiffies))
6195                         task->tk_status = -NFS4ERR_DELAY;
6196                 break;
6197         case -NFS4ERR_EXPIRED:
6198         case -NFS4ERR_BAD_STATEID:
6199