NFSv4: nfs4_proc_async_renew should use a GFP_NOFS allocation
[linux-2.6.git] / fs / nfs / nfs4proc.c
1 /*
2  *  fs/nfs/nfs4proc.c
3  *
4  *  Client-side procedure declarations for NFSv4.
5  *
6  *  Copyright (c) 2002 The Regents of the University of Michigan.
7  *  All rights reserved.
8  *
9  *  Kendrick Smith <kmsmith@umich.edu>
10  *  Andy Adamson   <andros@umich.edu>
11  *
12  *  Redistribution and use in source and binary forms, with or without
13  *  modification, are permitted provided that the following conditions
14  *  are met:
15  *
16  *  1. Redistributions of source code must retain the above copyright
17  *     notice, this list of conditions and the following disclaimer.
18  *  2. Redistributions in binary form must reproduce the above copyright
19  *     notice, this list of conditions and the following disclaimer in the
20  *     documentation and/or other materials provided with the distribution.
21  *  3. Neither the name of the University nor the names of its
22  *     contributors may be used to endorse or promote products derived
23  *     from this software without specific prior written permission.
24  *
25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36  */
37
38 #include <linux/mm.h>
39 #include <linux/delay.h>
40 #include <linux/errno.h>
41 #include <linux/string.h>
42 #include <linux/slab.h>
43 #include <linux/sunrpc/clnt.h>
44 #include <linux/sunrpc/gss_api.h>
45 #include <linux/nfs.h>
46 #include <linux/nfs4.h>
47 #include <linux/nfs_fs.h>
48 #include <linux/nfs_page.h>
49 #include <linux/nfs_mount.h>
50 #include <linux/namei.h>
51 #include <linux/mount.h>
52 #include <linux/module.h>
53 #include <linux/sunrpc/bc_xprt.h>
54 #include <linux/xattr.h>
55 #include <linux/utsname.h>
56
57 #include "nfs4_fs.h"
58 #include "delegation.h"
59 #include "internal.h"
60 #include "iostat.h"
61 #include "callback.h"
62 #include "pnfs.h"
63
64 #define NFSDBG_FACILITY         NFSDBG_PROC
65
66 #define NFS4_POLL_RETRY_MIN     (HZ/10)
67 #define NFS4_POLL_RETRY_MAX     (15*HZ)
68
69 #define NFS4_MAX_LOOP_ON_RECOVER (10)
70
71 struct nfs4_opendata;
72 static int _nfs4_proc_open(struct nfs4_opendata *data);
73 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
74 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
75 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
76 static int _nfs4_proc_lookup(struct rpc_clnt *client, struct inode *dir,
77                              const struct qstr *name, struct nfs_fh *fhandle,
78                              struct nfs_fattr *fattr);
79 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
80 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
81                             struct nfs_fattr *fattr, struct iattr *sattr,
82                             struct nfs4_state *state);
83 #ifdef CONFIG_NFS_V4_1
84 static int nfs41_test_stateid(struct nfs_server *, struct nfs4_state *);
85 static int nfs41_free_stateid(struct nfs_server *, struct nfs4_state *);
86 #endif
87 /* Prevent leaks of NFSv4 errors into userland */
88 static int nfs4_map_errors(int err)
89 {
90         if (err >= -1000)
91                 return err;
92         switch (err) {
93         case -NFS4ERR_RESOURCE:
94                 return -EREMOTEIO;
95         case -NFS4ERR_WRONGSEC:
96                 return -EPERM;
97         case -NFS4ERR_BADOWNER:
98         case -NFS4ERR_BADNAME:
99                 return -EINVAL;
100         default:
101                 dprintk("%s could not handle NFSv4 error %d\n",
102                                 __func__, -err);
103                 break;
104         }
105         return -EIO;
106 }
107
108 /*
109  * This is our standard bitmap for GETATTR requests.
110  */
111 const u32 nfs4_fattr_bitmap[2] = {
112         FATTR4_WORD0_TYPE
113         | FATTR4_WORD0_CHANGE
114         | FATTR4_WORD0_SIZE
115         | FATTR4_WORD0_FSID
116         | FATTR4_WORD0_FILEID,
117         FATTR4_WORD1_MODE
118         | FATTR4_WORD1_NUMLINKS
119         | FATTR4_WORD1_OWNER
120         | FATTR4_WORD1_OWNER_GROUP
121         | FATTR4_WORD1_RAWDEV
122         | FATTR4_WORD1_SPACE_USED
123         | FATTR4_WORD1_TIME_ACCESS
124         | FATTR4_WORD1_TIME_METADATA
125         | FATTR4_WORD1_TIME_MODIFY
126 };
127
128 const u32 nfs4_statfs_bitmap[2] = {
129         FATTR4_WORD0_FILES_AVAIL
130         | FATTR4_WORD0_FILES_FREE
131         | FATTR4_WORD0_FILES_TOTAL,
132         FATTR4_WORD1_SPACE_AVAIL
133         | FATTR4_WORD1_SPACE_FREE
134         | FATTR4_WORD1_SPACE_TOTAL
135 };
136
137 const u32 nfs4_pathconf_bitmap[2] = {
138         FATTR4_WORD0_MAXLINK
139         | FATTR4_WORD0_MAXNAME,
140         0
141 };
142
143 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
144                         | FATTR4_WORD0_MAXREAD
145                         | FATTR4_WORD0_MAXWRITE
146                         | FATTR4_WORD0_LEASE_TIME,
147                         FATTR4_WORD1_TIME_DELTA
148                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
149                         FATTR4_WORD2_LAYOUT_BLKSIZE
150 };
151
152 const u32 nfs4_fs_locations_bitmap[2] = {
153         FATTR4_WORD0_TYPE
154         | FATTR4_WORD0_CHANGE
155         | FATTR4_WORD0_SIZE
156         | FATTR4_WORD0_FSID
157         | FATTR4_WORD0_FILEID
158         | FATTR4_WORD0_FS_LOCATIONS,
159         FATTR4_WORD1_MODE
160         | FATTR4_WORD1_NUMLINKS
161         | FATTR4_WORD1_OWNER
162         | FATTR4_WORD1_OWNER_GROUP
163         | FATTR4_WORD1_RAWDEV
164         | FATTR4_WORD1_SPACE_USED
165         | FATTR4_WORD1_TIME_ACCESS
166         | FATTR4_WORD1_TIME_METADATA
167         | FATTR4_WORD1_TIME_MODIFY
168         | FATTR4_WORD1_MOUNTED_ON_FILEID
169 };
170
171 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
172                 struct nfs4_readdir_arg *readdir)
173 {
174         __be32 *start, *p;
175
176         BUG_ON(readdir->count < 80);
177         if (cookie > 2) {
178                 readdir->cookie = cookie;
179                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
180                 return;
181         }
182
183         readdir->cookie = 0;
184         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
185         if (cookie == 2)
186                 return;
187         
188         /*
189          * NFSv4 servers do not return entries for '.' and '..'
190          * Therefore, we fake these entries here.  We let '.'
191          * have cookie 0 and '..' have cookie 1.  Note that
192          * when talking to the server, we always send cookie 0
193          * instead of 1 or 2.
194          */
195         start = p = kmap_atomic(*readdir->pages, KM_USER0);
196         
197         if (cookie == 0) {
198                 *p++ = xdr_one;                                  /* next */
199                 *p++ = xdr_zero;                   /* cookie, first word */
200                 *p++ = xdr_one;                   /* cookie, second word */
201                 *p++ = xdr_one;                             /* entry len */
202                 memcpy(p, ".\0\0\0", 4);                        /* entry */
203                 p++;
204                 *p++ = xdr_one;                         /* bitmap length */
205                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
206                 *p++ = htonl(8);              /* attribute buffer length */
207                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
208         }
209         
210         *p++ = xdr_one;                                  /* next */
211         *p++ = xdr_zero;                   /* cookie, first word */
212         *p++ = xdr_two;                   /* cookie, second word */
213         *p++ = xdr_two;                             /* entry len */
214         memcpy(p, "..\0\0", 4);                         /* entry */
215         p++;
216         *p++ = xdr_one;                         /* bitmap length */
217         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
218         *p++ = htonl(8);              /* attribute buffer length */
219         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
220
221         readdir->pgbase = (char *)p - (char *)start;
222         readdir->count -= readdir->pgbase;
223         kunmap_atomic(start, KM_USER0);
224 }
225
226 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
227 {
228         int res;
229
230         might_sleep();
231
232         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
233                         nfs_wait_bit_killable, TASK_KILLABLE);
234         return res;
235 }
236
237 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
238 {
239         int res = 0;
240
241         might_sleep();
242
243         if (*timeout <= 0)
244                 *timeout = NFS4_POLL_RETRY_MIN;
245         if (*timeout > NFS4_POLL_RETRY_MAX)
246                 *timeout = NFS4_POLL_RETRY_MAX;
247         schedule_timeout_killable(*timeout);
248         if (fatal_signal_pending(current))
249                 res = -ERESTARTSYS;
250         *timeout <<= 1;
251         return res;
252 }
253
254 /* This is the error handling routine for processes that are allowed
255  * to sleep.
256  */
257 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
258 {
259         struct nfs_client *clp = server->nfs_client;
260         struct nfs4_state *state = exception->state;
261         int ret = errorcode;
262
263         exception->retry = 0;
264         switch(errorcode) {
265                 case 0:
266                         return 0;
267                 case -NFS4ERR_ADMIN_REVOKED:
268                 case -NFS4ERR_BAD_STATEID:
269                 case -NFS4ERR_OPENMODE:
270                         if (state == NULL)
271                                 break;
272                         nfs4_schedule_stateid_recovery(server, state);
273                         goto wait_on_recovery;
274                 case -NFS4ERR_EXPIRED:
275                         if (state != NULL)
276                                 nfs4_schedule_stateid_recovery(server, state);
277                 case -NFS4ERR_STALE_STATEID:
278                 case -NFS4ERR_STALE_CLIENTID:
279                         nfs4_schedule_lease_recovery(clp);
280                         goto wait_on_recovery;
281 #if defined(CONFIG_NFS_V4_1)
282                 case -NFS4ERR_BADSESSION:
283                 case -NFS4ERR_BADSLOT:
284                 case -NFS4ERR_BAD_HIGH_SLOT:
285                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
286                 case -NFS4ERR_DEADSESSION:
287                 case -NFS4ERR_SEQ_FALSE_RETRY:
288                 case -NFS4ERR_SEQ_MISORDERED:
289                         dprintk("%s ERROR: %d Reset session\n", __func__,
290                                 errorcode);
291                         nfs4_schedule_session_recovery(clp->cl_session);
292                         exception->retry = 1;
293                         break;
294 #endif /* defined(CONFIG_NFS_V4_1) */
295                 case -NFS4ERR_FILE_OPEN:
296                         if (exception->timeout > HZ) {
297                                 /* We have retried a decent amount, time to
298                                  * fail
299                                  */
300                                 ret = -EBUSY;
301                                 break;
302                         }
303                 case -NFS4ERR_GRACE:
304                 case -NFS4ERR_DELAY:
305                 case -EKEYEXPIRED:
306                         ret = nfs4_delay(server->client, &exception->timeout);
307                         if (ret != 0)
308                                 break;
309                 case -NFS4ERR_RETRY_UNCACHED_REP:
310                 case -NFS4ERR_OLD_STATEID:
311                         exception->retry = 1;
312                         break;
313                 case -NFS4ERR_BADOWNER:
314                         /* The following works around a Linux server bug! */
315                 case -NFS4ERR_BADNAME:
316                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
317                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
318                                 exception->retry = 1;
319                                 printk(KERN_WARNING "NFS: v4 server %s "
320                                                 "does not accept raw "
321                                                 "uid/gids. "
322                                                 "Reenabling the idmapper.\n",
323                                                 server->nfs_client->cl_hostname);
324                         }
325         }
326         /* We failed to handle the error */
327         return nfs4_map_errors(ret);
328 wait_on_recovery:
329         ret = nfs4_wait_clnt_recover(clp);
330         if (ret == 0)
331                 exception->retry = 1;
332         return ret;
333 }
334
335
336 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
337 {
338         spin_lock(&clp->cl_lock);
339         if (time_before(clp->cl_last_renewal,timestamp))
340                 clp->cl_last_renewal = timestamp;
341         spin_unlock(&clp->cl_lock);
342 }
343
344 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
345 {
346         do_renew_lease(server->nfs_client, timestamp);
347 }
348
349 #if defined(CONFIG_NFS_V4_1)
350
351 /*
352  * nfs4_free_slot - free a slot and efficiently update slot table.
353  *
354  * freeing a slot is trivially done by clearing its respective bit
355  * in the bitmap.
356  * If the freed slotid equals highest_used_slotid we want to update it
357  * so that the server would be able to size down the slot table if needed,
358  * otherwise we know that the highest_used_slotid is still in use.
359  * When updating highest_used_slotid there may be "holes" in the bitmap
360  * so we need to scan down from highest_used_slotid to 0 looking for the now
361  * highest slotid in use.
362  * If none found, highest_used_slotid is set to -1.
363  *
364  * Must be called while holding tbl->slot_tbl_lock
365  */
366 static void
367 nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *free_slot)
368 {
369         int free_slotid = free_slot - tbl->slots;
370         int slotid = free_slotid;
371
372         BUG_ON(slotid < 0 || slotid >= NFS4_MAX_SLOT_TABLE);
373         /* clear used bit in bitmap */
374         __clear_bit(slotid, tbl->used_slots);
375
376         /* update highest_used_slotid when it is freed */
377         if (slotid == tbl->highest_used_slotid) {
378                 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
379                 if (slotid < tbl->max_slots)
380                         tbl->highest_used_slotid = slotid;
381                 else
382                         tbl->highest_used_slotid = -1;
383         }
384         dprintk("%s: free_slotid %u highest_used_slotid %d\n", __func__,
385                 free_slotid, tbl->highest_used_slotid);
386 }
387
388 /*
389  * Signal state manager thread if session fore channel is drained
390  */
391 static void nfs4_check_drain_fc_complete(struct nfs4_session *ses)
392 {
393         struct rpc_task *task;
394
395         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
396                 task = rpc_wake_up_next(&ses->fc_slot_table.slot_tbl_waitq);
397                 if (task)
398                         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
399                 return;
400         }
401
402         if (ses->fc_slot_table.highest_used_slotid != -1)
403                 return;
404
405         dprintk("%s COMPLETE: Session Fore Channel Drained\n", __func__);
406         complete(&ses->fc_slot_table.complete);
407 }
408
409 /*
410  * Signal state manager thread if session back channel is drained
411  */
412 void nfs4_check_drain_bc_complete(struct nfs4_session *ses)
413 {
414         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state) ||
415             ses->bc_slot_table.highest_used_slotid != -1)
416                 return;
417         dprintk("%s COMPLETE: Session Back Channel Drained\n", __func__);
418         complete(&ses->bc_slot_table.complete);
419 }
420
421 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
422 {
423         struct nfs4_slot_table *tbl;
424
425         tbl = &res->sr_session->fc_slot_table;
426         if (!res->sr_slot) {
427                 /* just wake up the next guy waiting since
428                  * we may have not consumed a slot after all */
429                 dprintk("%s: No slot\n", __func__);
430                 return;
431         }
432
433         spin_lock(&tbl->slot_tbl_lock);
434         nfs4_free_slot(tbl, res->sr_slot);
435         nfs4_check_drain_fc_complete(res->sr_session);
436         spin_unlock(&tbl->slot_tbl_lock);
437         res->sr_slot = NULL;
438 }
439
440 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
441 {
442         unsigned long timestamp;
443         struct nfs_client *clp;
444
445         /*
446          * sr_status remains 1 if an RPC level error occurred. The server
447          * may or may not have processed the sequence operation..
448          * Proceed as if the server received and processed the sequence
449          * operation.
450          */
451         if (res->sr_status == 1)
452                 res->sr_status = NFS_OK;
453
454         /* don't increment the sequence number if the task wasn't sent */
455         if (!RPC_WAS_SENT(task))
456                 goto out;
457
458         /* Check the SEQUENCE operation status */
459         switch (res->sr_status) {
460         case 0:
461                 /* Update the slot's sequence and clientid lease timer */
462                 ++res->sr_slot->seq_nr;
463                 timestamp = res->sr_renewal_time;
464                 clp = res->sr_session->clp;
465                 do_renew_lease(clp, timestamp);
466                 /* Check sequence flags */
467                 if (res->sr_status_flags != 0)
468                         nfs4_schedule_lease_recovery(clp);
469                 break;
470         case -NFS4ERR_DELAY:
471                 /* The server detected a resend of the RPC call and
472                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
473                  * of RFC5661.
474                  */
475                 dprintk("%s: slot=%td seq=%d: Operation in progress\n",
476                         __func__,
477                         res->sr_slot - res->sr_session->fc_slot_table.slots,
478                         res->sr_slot->seq_nr);
479                 goto out_retry;
480         default:
481                 /* Just update the slot sequence no. */
482                 ++res->sr_slot->seq_nr;
483         }
484 out:
485         /* The session may be reset by one of the error handlers. */
486         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
487         nfs41_sequence_free_slot(res);
488         return 1;
489 out_retry:
490         if (!rpc_restart_call(task))
491                 goto out;
492         rpc_delay(task, NFS4_POLL_RETRY_MAX);
493         return 0;
494 }
495
496 static int nfs4_sequence_done(struct rpc_task *task,
497                                struct nfs4_sequence_res *res)
498 {
499         if (res->sr_session == NULL)
500                 return 1;
501         return nfs41_sequence_done(task, res);
502 }
503
504 /*
505  * nfs4_find_slot - efficiently look for a free slot
506  *
507  * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
508  * If found, we mark the slot as used, update the highest_used_slotid,
509  * and respectively set up the sequence operation args.
510  * The slot number is returned if found, or NFS4_MAX_SLOT_TABLE otherwise.
511  *
512  * Note: must be called with under the slot_tbl_lock.
513  */
514 static u8
515 nfs4_find_slot(struct nfs4_slot_table *tbl)
516 {
517         int slotid;
518         u8 ret_id = NFS4_MAX_SLOT_TABLE;
519         BUILD_BUG_ON((u8)NFS4_MAX_SLOT_TABLE != (int)NFS4_MAX_SLOT_TABLE);
520
521         dprintk("--> %s used_slots=%04lx highest_used=%d max_slots=%d\n",
522                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
523                 tbl->max_slots);
524         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
525         if (slotid >= tbl->max_slots)
526                 goto out;
527         __set_bit(slotid, tbl->used_slots);
528         if (slotid > tbl->highest_used_slotid)
529                 tbl->highest_used_slotid = slotid;
530         ret_id = slotid;
531 out:
532         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
533                 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
534         return ret_id;
535 }
536
537 int nfs41_setup_sequence(struct nfs4_session *session,
538                                 struct nfs4_sequence_args *args,
539                                 struct nfs4_sequence_res *res,
540                                 int cache_reply,
541                                 struct rpc_task *task)
542 {
543         struct nfs4_slot *slot;
544         struct nfs4_slot_table *tbl;
545         u8 slotid;
546
547         dprintk("--> %s\n", __func__);
548         /* slot already allocated? */
549         if (res->sr_slot != NULL)
550                 return 0;
551
552         tbl = &session->fc_slot_table;
553
554         spin_lock(&tbl->slot_tbl_lock);
555         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
556             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
557                 /*
558                  * The state manager will wait until the slot table is empty.
559                  * Schedule the reset thread
560                  */
561                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
562                 spin_unlock(&tbl->slot_tbl_lock);
563                 dprintk("%s Schedule Session Reset\n", __func__);
564                 return -EAGAIN;
565         }
566
567         if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
568             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
569                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
570                 spin_unlock(&tbl->slot_tbl_lock);
571                 dprintk("%s enforce FIFO order\n", __func__);
572                 return -EAGAIN;
573         }
574
575         slotid = nfs4_find_slot(tbl);
576         if (slotid == NFS4_MAX_SLOT_TABLE) {
577                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
578                 spin_unlock(&tbl->slot_tbl_lock);
579                 dprintk("<-- %s: no free slots\n", __func__);
580                 return -EAGAIN;
581         }
582         spin_unlock(&tbl->slot_tbl_lock);
583
584         rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
585         slot = tbl->slots + slotid;
586         args->sa_session = session;
587         args->sa_slotid = slotid;
588         args->sa_cache_this = cache_reply;
589
590         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
591
592         res->sr_session = session;
593         res->sr_slot = slot;
594         res->sr_renewal_time = jiffies;
595         res->sr_status_flags = 0;
596         /*
597          * sr_status is only set in decode_sequence, and so will remain
598          * set to 1 if an rpc level failure occurs.
599          */
600         res->sr_status = 1;
601         return 0;
602 }
603 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
604
605 int nfs4_setup_sequence(const struct nfs_server *server,
606                         struct nfs4_sequence_args *args,
607                         struct nfs4_sequence_res *res,
608                         int cache_reply,
609                         struct rpc_task *task)
610 {
611         struct nfs4_session *session = nfs4_get_session(server);
612         int ret = 0;
613
614         if (session == NULL) {
615                 args->sa_session = NULL;
616                 res->sr_session = NULL;
617                 goto out;
618         }
619
620         dprintk("--> %s clp %p session %p sr_slot %td\n",
621                 __func__, session->clp, session, res->sr_slot ?
622                         res->sr_slot - session->fc_slot_table.slots : -1);
623
624         ret = nfs41_setup_sequence(session, args, res, cache_reply,
625                                    task);
626 out:
627         dprintk("<-- %s status=%d\n", __func__, ret);
628         return ret;
629 }
630
631 struct nfs41_call_sync_data {
632         const struct nfs_server *seq_server;
633         struct nfs4_sequence_args *seq_args;
634         struct nfs4_sequence_res *seq_res;
635         int cache_reply;
636 };
637
638 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
639 {
640         struct nfs41_call_sync_data *data = calldata;
641
642         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
643
644         if (nfs4_setup_sequence(data->seq_server, data->seq_args,
645                                 data->seq_res, data->cache_reply, task))
646                 return;
647         rpc_call_start(task);
648 }
649
650 static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
651 {
652         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
653         nfs41_call_sync_prepare(task, calldata);
654 }
655
656 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
657 {
658         struct nfs41_call_sync_data *data = calldata;
659
660         nfs41_sequence_done(task, data->seq_res);
661 }
662
663 struct rpc_call_ops nfs41_call_sync_ops = {
664         .rpc_call_prepare = nfs41_call_sync_prepare,
665         .rpc_call_done = nfs41_call_sync_done,
666 };
667
668 struct rpc_call_ops nfs41_call_priv_sync_ops = {
669         .rpc_call_prepare = nfs41_call_priv_sync_prepare,
670         .rpc_call_done = nfs41_call_sync_done,
671 };
672
673 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
674                                    struct nfs_server *server,
675                                    struct rpc_message *msg,
676                                    struct nfs4_sequence_args *args,
677                                    struct nfs4_sequence_res *res,
678                                    int cache_reply,
679                                    int privileged)
680 {
681         int ret;
682         struct rpc_task *task;
683         struct nfs41_call_sync_data data = {
684                 .seq_server = server,
685                 .seq_args = args,
686                 .seq_res = res,
687                 .cache_reply = cache_reply,
688         };
689         struct rpc_task_setup task_setup = {
690                 .rpc_client = clnt,
691                 .rpc_message = msg,
692                 .callback_ops = &nfs41_call_sync_ops,
693                 .callback_data = &data
694         };
695
696         res->sr_slot = NULL;
697         if (privileged)
698                 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
699         task = rpc_run_task(&task_setup);
700         if (IS_ERR(task))
701                 ret = PTR_ERR(task);
702         else {
703                 ret = task->tk_status;
704                 rpc_put_task(task);
705         }
706         return ret;
707 }
708
709 int _nfs4_call_sync_session(struct rpc_clnt *clnt,
710                             struct nfs_server *server,
711                             struct rpc_message *msg,
712                             struct nfs4_sequence_args *args,
713                             struct nfs4_sequence_res *res,
714                             int cache_reply)
715 {
716         return nfs4_call_sync_sequence(clnt, server, msg, args, res, cache_reply, 0);
717 }
718
719 #else
720 static int nfs4_sequence_done(struct rpc_task *task,
721                                struct nfs4_sequence_res *res)
722 {
723         return 1;
724 }
725 #endif /* CONFIG_NFS_V4_1 */
726
727 int _nfs4_call_sync(struct rpc_clnt *clnt,
728                     struct nfs_server *server,
729                     struct rpc_message *msg,
730                     struct nfs4_sequence_args *args,
731                     struct nfs4_sequence_res *res,
732                     int cache_reply)
733 {
734         args->sa_session = res->sr_session = NULL;
735         return rpc_call_sync(clnt, msg, 0);
736 }
737
738 static inline
739 int nfs4_call_sync(struct rpc_clnt *clnt,
740                    struct nfs_server *server,
741                    struct rpc_message *msg,
742                    struct nfs4_sequence_args *args,
743                    struct nfs4_sequence_res *res,
744                    int cache_reply)
745 {
746         return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
747                                                 args, res, cache_reply);
748 }
749
750 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
751 {
752         struct nfs_inode *nfsi = NFS_I(dir);
753
754         spin_lock(&dir->i_lock);
755         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
756         if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
757                 nfs_force_lookup_revalidate(dir);
758         nfsi->change_attr = cinfo->after;
759         spin_unlock(&dir->i_lock);
760 }
761
762 struct nfs4_opendata {
763         struct kref kref;
764         struct nfs_openargs o_arg;
765         struct nfs_openres o_res;
766         struct nfs_open_confirmargs c_arg;
767         struct nfs_open_confirmres c_res;
768         struct nfs_fattr f_attr;
769         struct nfs_fattr dir_attr;
770         struct dentry *dir;
771         struct dentry *dentry;
772         struct nfs4_state_owner *owner;
773         struct nfs4_state *state;
774         struct iattr attrs;
775         unsigned long timestamp;
776         unsigned int rpc_done : 1;
777         int rpc_status;
778         int cancelled;
779 };
780
781
782 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
783 {
784         p->o_res.f_attr = &p->f_attr;
785         p->o_res.dir_attr = &p->dir_attr;
786         p->o_res.seqid = p->o_arg.seqid;
787         p->c_res.seqid = p->c_arg.seqid;
788         p->o_res.server = p->o_arg.server;
789         nfs_fattr_init(&p->f_attr);
790         nfs_fattr_init(&p->dir_attr);
791 }
792
793 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
794                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
795                 const struct iattr *attrs,
796                 gfp_t gfp_mask)
797 {
798         struct dentry *parent = dget_parent(dentry);
799         struct inode *dir = parent->d_inode;
800         struct nfs_server *server = NFS_SERVER(dir);
801         struct nfs4_opendata *p;
802
803         p = kzalloc(sizeof(*p), gfp_mask);
804         if (p == NULL)
805                 goto err;
806         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
807         if (p->o_arg.seqid == NULL)
808                 goto err_free;
809         nfs_sb_active(dentry->d_sb);
810         p->dentry = dget(dentry);
811         p->dir = parent;
812         p->owner = sp;
813         atomic_inc(&sp->so_count);
814         p->o_arg.fh = NFS_FH(dir);
815         p->o_arg.open_flags = flags;
816         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
817         p->o_arg.clientid = server->nfs_client->cl_clientid;
818         p->o_arg.id = sp->so_owner_id.id;
819         p->o_arg.name = &dentry->d_name;
820         p->o_arg.server = server;
821         p->o_arg.bitmask = server->attr_bitmask;
822         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
823         if (flags & O_CREAT) {
824                 u32 *s;
825
826                 p->o_arg.u.attrs = &p->attrs;
827                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
828                 s = (u32 *) p->o_arg.u.verifier.data;
829                 s[0] = jiffies;
830                 s[1] = current->pid;
831         }
832         p->c_arg.fh = &p->o_res.fh;
833         p->c_arg.stateid = &p->o_res.stateid;
834         p->c_arg.seqid = p->o_arg.seqid;
835         nfs4_init_opendata_res(p);
836         kref_init(&p->kref);
837         return p;
838 err_free:
839         kfree(p);
840 err:
841         dput(parent);
842         return NULL;
843 }
844
845 static void nfs4_opendata_free(struct kref *kref)
846 {
847         struct nfs4_opendata *p = container_of(kref,
848                         struct nfs4_opendata, kref);
849         struct super_block *sb = p->dentry->d_sb;
850
851         nfs_free_seqid(p->o_arg.seqid);
852         if (p->state != NULL)
853                 nfs4_put_open_state(p->state);
854         nfs4_put_state_owner(p->owner);
855         dput(p->dir);
856         dput(p->dentry);
857         nfs_sb_deactive(sb);
858         kfree(p);
859 }
860
861 static void nfs4_opendata_put(struct nfs4_opendata *p)
862 {
863         if (p != NULL)
864                 kref_put(&p->kref, nfs4_opendata_free);
865 }
866
867 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
868 {
869         int ret;
870
871         ret = rpc_wait_for_completion_task(task);
872         return ret;
873 }
874
875 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
876 {
877         int ret = 0;
878
879         if (open_mode & O_EXCL)
880                 goto out;
881         switch (mode & (FMODE_READ|FMODE_WRITE)) {
882                 case FMODE_READ:
883                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
884                                 && state->n_rdonly != 0;
885                         break;
886                 case FMODE_WRITE:
887                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
888                                 && state->n_wronly != 0;
889                         break;
890                 case FMODE_READ|FMODE_WRITE:
891                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
892                                 && state->n_rdwr != 0;
893         }
894 out:
895         return ret;
896 }
897
898 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
899 {
900         if ((delegation->type & fmode) != fmode)
901                 return 0;
902         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
903                 return 0;
904         nfs_mark_delegation_referenced(delegation);
905         return 1;
906 }
907
908 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
909 {
910         switch (fmode) {
911                 case FMODE_WRITE:
912                         state->n_wronly++;
913                         break;
914                 case FMODE_READ:
915                         state->n_rdonly++;
916                         break;
917                 case FMODE_READ|FMODE_WRITE:
918                         state->n_rdwr++;
919         }
920         nfs4_state_set_mode_locked(state, state->state | fmode);
921 }
922
923 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
924 {
925         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
926                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
927         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
928         switch (fmode) {
929                 case FMODE_READ:
930                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
931                         break;
932                 case FMODE_WRITE:
933                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
934                         break;
935                 case FMODE_READ|FMODE_WRITE:
936                         set_bit(NFS_O_RDWR_STATE, &state->flags);
937         }
938 }
939
940 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
941 {
942         write_seqlock(&state->seqlock);
943         nfs_set_open_stateid_locked(state, stateid, fmode);
944         write_sequnlock(&state->seqlock);
945 }
946
947 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
948 {
949         /*
950          * Protect the call to nfs4_state_set_mode_locked and
951          * serialise the stateid update
952          */
953         write_seqlock(&state->seqlock);
954         if (deleg_stateid != NULL) {
955                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
956                 set_bit(NFS_DELEGATED_STATE, &state->flags);
957         }
958         if (open_stateid != NULL)
959                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
960         write_sequnlock(&state->seqlock);
961         spin_lock(&state->owner->so_lock);
962         update_open_stateflags(state, fmode);
963         spin_unlock(&state->owner->so_lock);
964 }
965
966 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
967 {
968         struct nfs_inode *nfsi = NFS_I(state->inode);
969         struct nfs_delegation *deleg_cur;
970         int ret = 0;
971
972         fmode &= (FMODE_READ|FMODE_WRITE);
973
974         rcu_read_lock();
975         deleg_cur = rcu_dereference(nfsi->delegation);
976         if (deleg_cur == NULL)
977                 goto no_delegation;
978
979         spin_lock(&deleg_cur->lock);
980         if (nfsi->delegation != deleg_cur ||
981             (deleg_cur->type & fmode) != fmode)
982                 goto no_delegation_unlock;
983
984         if (delegation == NULL)
985                 delegation = &deleg_cur->stateid;
986         else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
987                 goto no_delegation_unlock;
988
989         nfs_mark_delegation_referenced(deleg_cur);
990         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
991         ret = 1;
992 no_delegation_unlock:
993         spin_unlock(&deleg_cur->lock);
994 no_delegation:
995         rcu_read_unlock();
996
997         if (!ret && open_stateid != NULL) {
998                 __update_open_stateid(state, open_stateid, NULL, fmode);
999                 ret = 1;
1000         }
1001
1002         return ret;
1003 }
1004
1005
1006 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1007 {
1008         struct nfs_delegation *delegation;
1009
1010         rcu_read_lock();
1011         delegation = rcu_dereference(NFS_I(inode)->delegation);
1012         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1013                 rcu_read_unlock();
1014                 return;
1015         }
1016         rcu_read_unlock();
1017         nfs_inode_return_delegation(inode);
1018 }
1019
1020 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1021 {
1022         struct nfs4_state *state = opendata->state;
1023         struct nfs_inode *nfsi = NFS_I(state->inode);
1024         struct nfs_delegation *delegation;
1025         int open_mode = opendata->o_arg.open_flags & O_EXCL;
1026         fmode_t fmode = opendata->o_arg.fmode;
1027         nfs4_stateid stateid;
1028         int ret = -EAGAIN;
1029
1030         for (;;) {
1031                 if (can_open_cached(state, fmode, open_mode)) {
1032                         spin_lock(&state->owner->so_lock);
1033                         if (can_open_cached(state, fmode, open_mode)) {
1034                                 update_open_stateflags(state, fmode);
1035                                 spin_unlock(&state->owner->so_lock);
1036                                 goto out_return_state;
1037                         }
1038                         spin_unlock(&state->owner->so_lock);
1039                 }
1040                 rcu_read_lock();
1041                 delegation = rcu_dereference(nfsi->delegation);
1042                 if (delegation == NULL ||
1043                     !can_open_delegated(delegation, fmode)) {
1044                         rcu_read_unlock();
1045                         break;
1046                 }
1047                 /* Save the delegation */
1048                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
1049                 rcu_read_unlock();
1050                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1051                 if (ret != 0)
1052                         goto out;
1053                 ret = -EAGAIN;
1054
1055                 /* Try to update the stateid using the delegation */
1056                 if (update_open_stateid(state, NULL, &stateid, fmode))
1057                         goto out_return_state;
1058         }
1059 out:
1060         return ERR_PTR(ret);
1061 out_return_state:
1062         atomic_inc(&state->count);
1063         return state;
1064 }
1065
1066 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1067 {
1068         struct inode *inode;
1069         struct nfs4_state *state = NULL;
1070         struct nfs_delegation *delegation;
1071         int ret;
1072
1073         if (!data->rpc_done) {
1074                 state = nfs4_try_open_cached(data);
1075                 goto out;
1076         }
1077
1078         ret = -EAGAIN;
1079         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1080                 goto err;
1081         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1082         ret = PTR_ERR(inode);
1083         if (IS_ERR(inode))
1084                 goto err;
1085         ret = -ENOMEM;
1086         state = nfs4_get_open_state(inode, data->owner);
1087         if (state == NULL)
1088                 goto err_put_inode;
1089         if (data->o_res.delegation_type != 0) {
1090                 int delegation_flags = 0;
1091
1092                 rcu_read_lock();
1093                 delegation = rcu_dereference(NFS_I(inode)->delegation);
1094                 if (delegation)
1095                         delegation_flags = delegation->flags;
1096                 rcu_read_unlock();
1097                 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1098                         nfs_inode_set_delegation(state->inode,
1099                                         data->owner->so_cred,
1100                                         &data->o_res);
1101                 else
1102                         nfs_inode_reclaim_delegation(state->inode,
1103                                         data->owner->so_cred,
1104                                         &data->o_res);
1105         }
1106
1107         update_open_stateid(state, &data->o_res.stateid, NULL,
1108                         data->o_arg.fmode);
1109         iput(inode);
1110 out:
1111         return state;
1112 err_put_inode:
1113         iput(inode);
1114 err:
1115         return ERR_PTR(ret);
1116 }
1117
1118 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1119 {
1120         struct nfs_inode *nfsi = NFS_I(state->inode);
1121         struct nfs_open_context *ctx;
1122
1123         spin_lock(&state->inode->i_lock);
1124         list_for_each_entry(ctx, &nfsi->open_files, list) {
1125                 if (ctx->state != state)
1126                         continue;
1127                 get_nfs_open_context(ctx);
1128                 spin_unlock(&state->inode->i_lock);
1129                 return ctx;
1130         }
1131         spin_unlock(&state->inode->i_lock);
1132         return ERR_PTR(-ENOENT);
1133 }
1134
1135 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1136 {
1137         struct nfs4_opendata *opendata;
1138
1139         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, NULL, GFP_NOFS);
1140         if (opendata == NULL)
1141                 return ERR_PTR(-ENOMEM);
1142         opendata->state = state;
1143         atomic_inc(&state->count);
1144         return opendata;
1145 }
1146
1147 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1148 {
1149         struct nfs4_state *newstate;
1150         int ret;
1151
1152         opendata->o_arg.open_flags = 0;
1153         opendata->o_arg.fmode = fmode;
1154         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1155         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1156         nfs4_init_opendata_res(opendata);
1157         ret = _nfs4_recover_proc_open(opendata);
1158         if (ret != 0)
1159                 return ret; 
1160         newstate = nfs4_opendata_to_nfs4_state(opendata);
1161         if (IS_ERR(newstate))
1162                 return PTR_ERR(newstate);
1163         nfs4_close_state(newstate, fmode);
1164         *res = newstate;
1165         return 0;
1166 }
1167
1168 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1169 {
1170         struct nfs4_state *newstate;
1171         int ret;
1172
1173         /* memory barrier prior to reading state->n_* */
1174         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1175         smp_rmb();
1176         if (state->n_rdwr != 0) {
1177                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1178                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1179                 if (ret != 0)
1180                         return ret;
1181                 if (newstate != state)
1182                         return -ESTALE;
1183         }
1184         if (state->n_wronly != 0) {
1185                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1186                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1187                 if (ret != 0)
1188                         return ret;
1189                 if (newstate != state)
1190                         return -ESTALE;
1191         }
1192         if (state->n_rdonly != 0) {
1193                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1194                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1195                 if (ret != 0)
1196                         return ret;
1197                 if (newstate != state)
1198                         return -ESTALE;
1199         }
1200         /*
1201          * We may have performed cached opens for all three recoveries.
1202          * Check if we need to update the current stateid.
1203          */
1204         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1205             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
1206                 write_seqlock(&state->seqlock);
1207                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1208                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
1209                 write_sequnlock(&state->seqlock);
1210         }
1211         return 0;
1212 }
1213
1214 /*
1215  * OPEN_RECLAIM:
1216  *      reclaim state on the server after a reboot.
1217  */
1218 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1219 {
1220         struct nfs_delegation *delegation;
1221         struct nfs4_opendata *opendata;
1222         fmode_t delegation_type = 0;
1223         int status;
1224
1225         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1226         if (IS_ERR(opendata))
1227                 return PTR_ERR(opendata);
1228         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1229         opendata->o_arg.fh = NFS_FH(state->inode);
1230         rcu_read_lock();
1231         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1232         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1233                 delegation_type = delegation->type;
1234         rcu_read_unlock();
1235         opendata->o_arg.u.delegation_type = delegation_type;
1236         status = nfs4_open_recover(opendata, state);
1237         nfs4_opendata_put(opendata);
1238         return status;
1239 }
1240
1241 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1242 {
1243         struct nfs_server *server = NFS_SERVER(state->inode);
1244         struct nfs4_exception exception = { };
1245         int err;
1246         do {
1247                 err = _nfs4_do_open_reclaim(ctx, state);
1248                 if (err != -NFS4ERR_DELAY)
1249                         break;
1250                 nfs4_handle_exception(server, err, &exception);
1251         } while (exception.retry);
1252         return err;
1253 }
1254
1255 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1256 {
1257         struct nfs_open_context *ctx;
1258         int ret;
1259
1260         ctx = nfs4_state_find_open_context(state);
1261         if (IS_ERR(ctx))
1262                 return PTR_ERR(ctx);
1263         ret = nfs4_do_open_reclaim(ctx, state);
1264         put_nfs_open_context(ctx);
1265         return ret;
1266 }
1267
1268 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1269 {
1270         struct nfs4_opendata *opendata;
1271         int ret;
1272
1273         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1274         if (IS_ERR(opendata))
1275                 return PTR_ERR(opendata);
1276         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1277         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
1278                         sizeof(opendata->o_arg.u.delegation.data));
1279         ret = nfs4_open_recover(opendata, state);
1280         nfs4_opendata_put(opendata);
1281         return ret;
1282 }
1283
1284 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1285 {
1286         struct nfs4_exception exception = { };
1287         struct nfs_server *server = NFS_SERVER(state->inode);
1288         int err;
1289         do {
1290                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1291                 switch (err) {
1292                         case 0:
1293                         case -ENOENT:
1294                         case -ESTALE:
1295                                 goto out;
1296                         case -NFS4ERR_BADSESSION:
1297                         case -NFS4ERR_BADSLOT:
1298                         case -NFS4ERR_BAD_HIGH_SLOT:
1299                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1300                         case -NFS4ERR_DEADSESSION:
1301                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
1302                                 goto out;
1303                         case -NFS4ERR_STALE_CLIENTID:
1304                         case -NFS4ERR_STALE_STATEID:
1305                         case -NFS4ERR_EXPIRED:
1306                                 /* Don't recall a delegation if it was lost */
1307                                 nfs4_schedule_lease_recovery(server->nfs_client);
1308                                 goto out;
1309                         case -ERESTARTSYS:
1310                                 /*
1311                                  * The show must go on: exit, but mark the
1312                                  * stateid as needing recovery.
1313                                  */
1314                         case -NFS4ERR_ADMIN_REVOKED:
1315                         case -NFS4ERR_BAD_STATEID:
1316                                 nfs4_schedule_stateid_recovery(server, state);
1317                         case -EKEYEXPIRED:
1318                                 /*
1319                                  * User RPCSEC_GSS context has expired.
1320                                  * We cannot recover this stateid now, so
1321                                  * skip it and allow recovery thread to
1322                                  * proceed.
1323                                  */
1324                         case -ENOMEM:
1325                                 err = 0;
1326                                 goto out;
1327                 }
1328                 err = nfs4_handle_exception(server, err, &exception);
1329         } while (exception.retry);
1330 out:
1331         return err;
1332 }
1333
1334 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1335 {
1336         struct nfs4_opendata *data = calldata;
1337
1338         data->rpc_status = task->tk_status;
1339         if (data->rpc_status == 0) {
1340                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
1341                                 sizeof(data->o_res.stateid.data));
1342                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1343                 renew_lease(data->o_res.server, data->timestamp);
1344                 data->rpc_done = 1;
1345         }
1346 }
1347
1348 static void nfs4_open_confirm_release(void *calldata)
1349 {
1350         struct nfs4_opendata *data = calldata;
1351         struct nfs4_state *state = NULL;
1352
1353         /* If this request hasn't been cancelled, do nothing */
1354         if (data->cancelled == 0)
1355                 goto out_free;
1356         /* In case of error, no cleanup! */
1357         if (!data->rpc_done)
1358                 goto out_free;
1359         state = nfs4_opendata_to_nfs4_state(data);
1360         if (!IS_ERR(state))
1361                 nfs4_close_state(state, data->o_arg.fmode);
1362 out_free:
1363         nfs4_opendata_put(data);
1364 }
1365
1366 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1367         .rpc_call_done = nfs4_open_confirm_done,
1368         .rpc_release = nfs4_open_confirm_release,
1369 };
1370
1371 /*
1372  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1373  */
1374 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1375 {
1376         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1377         struct rpc_task *task;
1378         struct  rpc_message msg = {
1379                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1380                 .rpc_argp = &data->c_arg,
1381                 .rpc_resp = &data->c_res,
1382                 .rpc_cred = data->owner->so_cred,
1383         };
1384         struct rpc_task_setup task_setup_data = {
1385                 .rpc_client = server->client,
1386                 .rpc_message = &msg,
1387                 .callback_ops = &nfs4_open_confirm_ops,
1388                 .callback_data = data,
1389                 .workqueue = nfsiod_workqueue,
1390                 .flags = RPC_TASK_ASYNC,
1391         };
1392         int status;
1393
1394         kref_get(&data->kref);
1395         data->rpc_done = 0;
1396         data->rpc_status = 0;
1397         data->timestamp = jiffies;
1398         task = rpc_run_task(&task_setup_data);
1399         if (IS_ERR(task))
1400                 return PTR_ERR(task);
1401         status = nfs4_wait_for_completion_rpc_task(task);
1402         if (status != 0) {
1403                 data->cancelled = 1;
1404                 smp_wmb();
1405         } else
1406                 status = data->rpc_status;
1407         rpc_put_task(task);
1408         return status;
1409 }
1410
1411 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1412 {
1413         struct nfs4_opendata *data = calldata;
1414         struct nfs4_state_owner *sp = data->owner;
1415
1416         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1417                 return;
1418         /*
1419          * Check if we still need to send an OPEN call, or if we can use
1420          * a delegation instead.
1421          */
1422         if (data->state != NULL) {
1423                 struct nfs_delegation *delegation;
1424
1425                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1426                         goto out_no_action;
1427                 rcu_read_lock();
1428                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1429                 if (delegation != NULL &&
1430                     test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) {
1431                         rcu_read_unlock();
1432                         goto out_no_action;
1433                 }
1434                 rcu_read_unlock();
1435         }
1436         /* Update sequence id. */
1437         data->o_arg.id = sp->so_owner_id.id;
1438         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1439         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1440                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1441                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1442         }
1443         data->timestamp = jiffies;
1444         if (nfs4_setup_sequence(data->o_arg.server,
1445                                 &data->o_arg.seq_args,
1446                                 &data->o_res.seq_res, 1, task))
1447                 return;
1448         rpc_call_start(task);
1449         return;
1450 out_no_action:
1451         task->tk_action = NULL;
1452
1453 }
1454
1455 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1456 {
1457         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1458         nfs4_open_prepare(task, calldata);
1459 }
1460
1461 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1462 {
1463         struct nfs4_opendata *data = calldata;
1464
1465         data->rpc_status = task->tk_status;
1466
1467         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1468                 return;
1469
1470         if (task->tk_status == 0) {
1471                 switch (data->o_res.f_attr->mode & S_IFMT) {
1472                         case S_IFREG:
1473                                 break;
1474                         case S_IFLNK:
1475                                 data->rpc_status = -ELOOP;
1476                                 break;
1477                         case S_IFDIR:
1478                                 data->rpc_status = -EISDIR;
1479                                 break;
1480                         default:
1481                                 data->rpc_status = -ENOTDIR;
1482                 }
1483                 renew_lease(data->o_res.server, data->timestamp);
1484                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1485                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1486         }
1487         data->rpc_done = 1;
1488 }
1489
1490 static void nfs4_open_release(void *calldata)
1491 {
1492         struct nfs4_opendata *data = calldata;
1493         struct nfs4_state *state = NULL;
1494
1495         /* If this request hasn't been cancelled, do nothing */
1496         if (data->cancelled == 0)
1497                 goto out_free;
1498         /* In case of error, no cleanup! */
1499         if (data->rpc_status != 0 || !data->rpc_done)
1500                 goto out_free;
1501         /* In case we need an open_confirm, no cleanup! */
1502         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1503                 goto out_free;
1504         state = nfs4_opendata_to_nfs4_state(data);
1505         if (!IS_ERR(state))
1506                 nfs4_close_state(state, data->o_arg.fmode);
1507 out_free:
1508         nfs4_opendata_put(data);
1509 }
1510
1511 static const struct rpc_call_ops nfs4_open_ops = {
1512         .rpc_call_prepare = nfs4_open_prepare,
1513         .rpc_call_done = nfs4_open_done,
1514         .rpc_release = nfs4_open_release,
1515 };
1516
1517 static const struct rpc_call_ops nfs4_recover_open_ops = {
1518         .rpc_call_prepare = nfs4_recover_open_prepare,
1519         .rpc_call_done = nfs4_open_done,
1520         .rpc_release = nfs4_open_release,
1521 };
1522
1523 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1524 {
1525         struct inode *dir = data->dir->d_inode;
1526         struct nfs_server *server = NFS_SERVER(dir);
1527         struct nfs_openargs *o_arg = &data->o_arg;
1528         struct nfs_openres *o_res = &data->o_res;
1529         struct rpc_task *task;
1530         struct rpc_message msg = {
1531                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1532                 .rpc_argp = o_arg,
1533                 .rpc_resp = o_res,
1534                 .rpc_cred = data->owner->so_cred,
1535         };
1536         struct rpc_task_setup task_setup_data = {
1537                 .rpc_client = server->client,
1538                 .rpc_message = &msg,
1539                 .callback_ops = &nfs4_open_ops,
1540                 .callback_data = data,
1541                 .workqueue = nfsiod_workqueue,
1542                 .flags = RPC_TASK_ASYNC,
1543         };
1544         int status;
1545
1546         kref_get(&data->kref);
1547         data->rpc_done = 0;
1548         data->rpc_status = 0;
1549         data->cancelled = 0;
1550         if (isrecover)
1551                 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1552         task = rpc_run_task(&task_setup_data);
1553         if (IS_ERR(task))
1554                 return PTR_ERR(task);
1555         status = nfs4_wait_for_completion_rpc_task(task);
1556         if (status != 0) {
1557                 data->cancelled = 1;
1558                 smp_wmb();
1559         } else
1560                 status = data->rpc_status;
1561         rpc_put_task(task);
1562
1563         return status;
1564 }
1565
1566 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1567 {
1568         struct inode *dir = data->dir->d_inode;
1569         struct nfs_openres *o_res = &data->o_res;
1570         int status;
1571
1572         status = nfs4_run_open_task(data, 1);
1573         if (status != 0 || !data->rpc_done)
1574                 return status;
1575
1576         nfs_refresh_inode(dir, o_res->dir_attr);
1577
1578         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1579                 status = _nfs4_proc_open_confirm(data);
1580                 if (status != 0)
1581                         return status;
1582         }
1583
1584         return status;
1585 }
1586
1587 /*
1588  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1589  */
1590 static int _nfs4_proc_open(struct nfs4_opendata *data)
1591 {
1592         struct inode *dir = data->dir->d_inode;
1593         struct nfs_server *server = NFS_SERVER(dir);
1594         struct nfs_openargs *o_arg = &data->o_arg;
1595         struct nfs_openres *o_res = &data->o_res;
1596         int status;
1597
1598         status = nfs4_run_open_task(data, 0);
1599         if (status != 0 || !data->rpc_done)
1600                 return status;
1601
1602         if (o_arg->open_flags & O_CREAT) {
1603                 update_changeattr(dir, &o_res->cinfo);
1604                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1605         } else
1606                 nfs_refresh_inode(dir, o_res->dir_attr);
1607         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1608                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1609         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1610                 status = _nfs4_proc_open_confirm(data);
1611                 if (status != 0)
1612                         return status;
1613         }
1614         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1615                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1616         return 0;
1617 }
1618
1619 static int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1620 {
1621         unsigned int loop;
1622         int ret;
1623
1624         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1625                 ret = nfs4_wait_clnt_recover(clp);
1626                 if (ret != 0)
1627                         break;
1628                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1629                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1630                         break;
1631                 nfs4_schedule_state_manager(clp);
1632                 ret = -EIO;
1633         }
1634         return ret;
1635 }
1636
1637 static int nfs4_recover_expired_lease(struct nfs_server *server)
1638 {
1639         return nfs4_client_recover_expired_lease(server->nfs_client);
1640 }
1641
1642 /*
1643  * OPEN_EXPIRED:
1644  *      reclaim state on the server after a network partition.
1645  *      Assumes caller holds the appropriate lock
1646  */
1647 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1648 {
1649         struct nfs4_opendata *opendata;
1650         int ret;
1651
1652         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1653         if (IS_ERR(opendata))
1654                 return PTR_ERR(opendata);
1655         ret = nfs4_open_recover(opendata, state);
1656         if (ret == -ESTALE)
1657                 d_drop(ctx->dentry);
1658         nfs4_opendata_put(opendata);
1659         return ret;
1660 }
1661
1662 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1663 {
1664         struct nfs_server *server = NFS_SERVER(state->inode);
1665         struct nfs4_exception exception = { };
1666         int err;
1667
1668         do {
1669                 err = _nfs4_open_expired(ctx, state);
1670                 switch (err) {
1671                 default:
1672                         goto out;
1673                 case -NFS4ERR_GRACE:
1674                 case -NFS4ERR_DELAY:
1675                         nfs4_handle_exception(server, err, &exception);
1676                         err = 0;
1677                 }
1678         } while (exception.retry);
1679 out:
1680         return err;
1681 }
1682
1683 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1684 {
1685         struct nfs_open_context *ctx;
1686         int ret;
1687
1688         ctx = nfs4_state_find_open_context(state);
1689         if (IS_ERR(ctx))
1690                 return PTR_ERR(ctx);
1691         ret = nfs4_do_open_expired(ctx, state);
1692         put_nfs_open_context(ctx);
1693         return ret;
1694 }
1695
1696 #if defined(CONFIG_NFS_V4_1)
1697 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1698 {
1699         int status;
1700         struct nfs_server *server = NFS_SERVER(state->inode);
1701
1702         status = nfs41_test_stateid(server, state);
1703         if (status == NFS_OK)
1704                 return 0;
1705         nfs41_free_stateid(server, state);
1706         return nfs4_open_expired(sp, state);
1707 }
1708 #endif
1709
1710 /*
1711  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1712  * fields corresponding to attributes that were used to store the verifier.
1713  * Make sure we clobber those fields in the later setattr call
1714  */
1715 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1716 {
1717         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1718             !(sattr->ia_valid & ATTR_ATIME_SET))
1719                 sattr->ia_valid |= ATTR_ATIME;
1720
1721         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1722             !(sattr->ia_valid & ATTR_MTIME_SET))
1723                 sattr->ia_valid |= ATTR_MTIME;
1724 }
1725
1726 /*
1727  * Returns a referenced nfs4_state
1728  */
1729 static int _nfs4_do_open(struct inode *dir, struct dentry *dentry, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
1730 {
1731         struct nfs4_state_owner  *sp;
1732         struct nfs4_state     *state = NULL;
1733         struct nfs_server       *server = NFS_SERVER(dir);
1734         struct nfs4_opendata *opendata;
1735         int status;
1736
1737         /* Protect against reboot recovery conflicts */
1738         status = -ENOMEM;
1739         if (!(sp = nfs4_get_state_owner(server, cred))) {
1740                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1741                 goto out_err;
1742         }
1743         status = nfs4_recover_expired_lease(server);
1744         if (status != 0)
1745                 goto err_put_state_owner;
1746         if (dentry->d_inode != NULL)
1747                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
1748         status = -ENOMEM;
1749         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, GFP_KERNEL);
1750         if (opendata == NULL)
1751                 goto err_put_state_owner;
1752
1753         if (dentry->d_inode != NULL)
1754                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
1755
1756         status = _nfs4_proc_open(opendata);
1757         if (status != 0)
1758                 goto err_opendata_put;
1759
1760         state = nfs4_opendata_to_nfs4_state(opendata);
1761         status = PTR_ERR(state);
1762         if (IS_ERR(state))
1763                 goto err_opendata_put;
1764         if (server->caps & NFS_CAP_POSIX_LOCK)
1765                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1766
1767         if (opendata->o_arg.open_flags & O_EXCL) {
1768                 nfs4_exclusive_attrset(opendata, sattr);
1769
1770                 nfs_fattr_init(opendata->o_res.f_attr);
1771                 status = nfs4_do_setattr(state->inode, cred,
1772                                 opendata->o_res.f_attr, sattr,
1773                                 state);
1774                 if (status == 0)
1775                         nfs_setattr_update_inode(state->inode, sattr);
1776                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1777         }
1778         nfs4_opendata_put(opendata);
1779         nfs4_put_state_owner(sp);
1780         *res = state;
1781         return 0;
1782 err_opendata_put:
1783         nfs4_opendata_put(opendata);
1784 err_put_state_owner:
1785         nfs4_put_state_owner(sp);
1786 out_err:
1787         *res = NULL;
1788         return status;
1789 }
1790
1791
1792 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct dentry *dentry, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred)
1793 {
1794         struct nfs4_exception exception = { };
1795         struct nfs4_state *res;
1796         int status;
1797
1798         do {
1799                 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred, &res);
1800                 if (status == 0)
1801                         break;
1802                 /* NOTE: BAD_SEQID means the server and client disagree about the
1803                  * book-keeping w.r.t. state-changing operations
1804                  * (OPEN/CLOSE/LOCK/LOCKU...)
1805                  * It is actually a sign of a bug on the client or on the server.
1806                  *
1807                  * If we receive a BAD_SEQID error in the particular case of
1808                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1809                  * have unhashed the old state_owner for us, and that we can
1810                  * therefore safely retry using a new one. We should still warn
1811                  * the user though...
1812                  */
1813                 if (status == -NFS4ERR_BAD_SEQID) {
1814                         printk(KERN_WARNING "NFS: v4 server %s "
1815                                         " returned a bad sequence-id error!\n",
1816                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1817                         exception.retry = 1;
1818                         continue;
1819                 }
1820                 /*
1821                  * BAD_STATEID on OPEN means that the server cancelled our
1822                  * state before it received the OPEN_CONFIRM.
1823                  * Recover by retrying the request as per the discussion
1824                  * on Page 181 of RFC3530.
1825                  */
1826                 if (status == -NFS4ERR_BAD_STATEID) {
1827                         exception.retry = 1;
1828                         continue;
1829                 }
1830                 if (status == -EAGAIN) {
1831                         /* We must have found a delegation */
1832                         exception.retry = 1;
1833                         continue;
1834                 }
1835                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1836                                         status, &exception));
1837         } while (exception.retry);
1838         return res;
1839 }
1840
1841 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1842                             struct nfs_fattr *fattr, struct iattr *sattr,
1843                             struct nfs4_state *state)
1844 {
1845         struct nfs_server *server = NFS_SERVER(inode);
1846         struct nfs_setattrargs  arg = {
1847                 .fh             = NFS_FH(inode),
1848                 .iap            = sattr,
1849                 .server         = server,
1850                 .bitmask = server->attr_bitmask,
1851         };
1852         struct nfs_setattrres  res = {
1853                 .fattr          = fattr,
1854                 .server         = server,
1855         };
1856         struct rpc_message msg = {
1857                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1858                 .rpc_argp       = &arg,
1859                 .rpc_resp       = &res,
1860                 .rpc_cred       = cred,
1861         };
1862         unsigned long timestamp = jiffies;
1863         int status;
1864
1865         nfs_fattr_init(fattr);
1866
1867         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1868                 /* Use that stateid */
1869         } else if (state != NULL) {
1870                 nfs4_copy_stateid(&arg.stateid, state, current->files, current->tgid);
1871         } else
1872                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1873
1874         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
1875         if (status == 0 && state != NULL)
1876                 renew_lease(server, timestamp);
1877         return status;
1878 }
1879
1880 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1881                            struct nfs_fattr *fattr, struct iattr *sattr,
1882                            struct nfs4_state *state)
1883 {
1884         struct nfs_server *server = NFS_SERVER(inode);
1885         struct nfs4_exception exception = { };
1886         int err;
1887         do {
1888                 err = nfs4_handle_exception(server,
1889                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1890                                 &exception);
1891         } while (exception.retry);
1892         return err;
1893 }
1894
1895 struct nfs4_closedata {
1896         struct inode *inode;
1897         struct nfs4_state *state;
1898         struct nfs_closeargs arg;
1899         struct nfs_closeres res;
1900         struct nfs_fattr fattr;
1901         unsigned long timestamp;
1902         bool roc;
1903         u32 roc_barrier;
1904 };
1905
1906 static void nfs4_free_closedata(void *data)
1907 {
1908         struct nfs4_closedata *calldata = data;
1909         struct nfs4_state_owner *sp = calldata->state->owner;
1910         struct super_block *sb = calldata->state->inode->i_sb;
1911
1912         if (calldata->roc)
1913                 pnfs_roc_release(calldata->state->inode);
1914         nfs4_put_open_state(calldata->state);
1915         nfs_free_seqid(calldata->arg.seqid);
1916         nfs4_put_state_owner(sp);
1917         nfs_sb_deactive(sb);
1918         kfree(calldata);
1919 }
1920
1921 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
1922                 fmode_t fmode)
1923 {
1924         spin_lock(&state->owner->so_lock);
1925         if (!(fmode & FMODE_READ))
1926                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1927         if (!(fmode & FMODE_WRITE))
1928                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1929         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1930         spin_unlock(&state->owner->so_lock);
1931 }
1932
1933 static void nfs4_close_done(struct rpc_task *task, void *data)
1934 {
1935         struct nfs4_closedata *calldata = data;
1936         struct nfs4_state *state = calldata->state;
1937         struct nfs_server *server = NFS_SERVER(calldata->inode);
1938
1939         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
1940                 return;
1941         /* hmm. we are done with the inode, and in the process of freeing
1942          * the state_owner. we keep this around to process errors
1943          */
1944         switch (task->tk_status) {
1945                 case 0:
1946                         if (calldata->roc)
1947                                 pnfs_roc_set_barrier(state->inode,
1948                                                      calldata->roc_barrier);
1949                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1950                         renew_lease(server, calldata->timestamp);
1951                         nfs4_close_clear_stateid_flags(state,
1952                                         calldata->arg.fmode);
1953                         break;
1954                 case -NFS4ERR_STALE_STATEID:
1955                 case -NFS4ERR_OLD_STATEID:
1956                 case -NFS4ERR_BAD_STATEID:
1957                 case -NFS4ERR_EXPIRED:
1958                         if (calldata->arg.fmode == 0)
1959                                 break;
1960                 default:
1961                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
1962                                 rpc_restart_call_prepare(task);
1963         }
1964         nfs_release_seqid(calldata->arg.seqid);
1965         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1966 }
1967
1968 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1969 {
1970         struct nfs4_closedata *calldata = data;
1971         struct nfs4_state *state = calldata->state;
1972         int call_close = 0;
1973
1974         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1975                 return;
1976
1977         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1978         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
1979         spin_lock(&state->owner->so_lock);
1980         /* Calculate the change in open mode */
1981         if (state->n_rdwr == 0) {
1982                 if (state->n_rdonly == 0) {
1983                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
1984                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1985                         calldata->arg.fmode &= ~FMODE_READ;
1986                 }
1987                 if (state->n_wronly == 0) {
1988                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
1989                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1990                         calldata->arg.fmode &= ~FMODE_WRITE;
1991                 }
1992         }
1993         spin_unlock(&state->owner->so_lock);
1994
1995         if (!call_close) {
1996                 /* Note: exit _without_ calling nfs4_close_done */
1997                 task->tk_action = NULL;
1998                 return;
1999         }
2000
2001         if (calldata->arg.fmode == 0) {
2002                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2003                 if (calldata->roc &&
2004                     pnfs_roc_drain(calldata->inode, &calldata->roc_barrier)) {
2005                         rpc_sleep_on(&NFS_SERVER(calldata->inode)->roc_rpcwaitq,
2006                                      task, NULL);
2007                         return;
2008                 }
2009         }
2010
2011         nfs_fattr_init(calldata->res.fattr);
2012         calldata->timestamp = jiffies;
2013         if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
2014                                 &calldata->arg.seq_args, &calldata->res.seq_res,
2015                                 1, task))
2016                 return;
2017         rpc_call_start(task);
2018 }
2019
2020 static const struct rpc_call_ops nfs4_close_ops = {
2021         .rpc_call_prepare = nfs4_close_prepare,
2022         .rpc_call_done = nfs4_close_done,
2023         .rpc_release = nfs4_free_closedata,
2024 };
2025
2026 /* 
2027  * It is possible for data to be read/written from a mem-mapped file 
2028  * after the sys_close call (which hits the vfs layer as a flush).
2029  * This means that we can't safely call nfsv4 close on a file until 
2030  * the inode is cleared. This in turn means that we are not good
2031  * NFSv4 citizens - we do not indicate to the server to update the file's 
2032  * share state even when we are done with one of the three share 
2033  * stateid's in the inode.
2034  *
2035  * NOTE: Caller must be holding the sp->so_owner semaphore!
2036  */
2037 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait, bool roc)
2038 {
2039         struct nfs_server *server = NFS_SERVER(state->inode);
2040         struct nfs4_closedata *calldata;
2041         struct nfs4_state_owner *sp = state->owner;
2042         struct rpc_task *task;
2043         struct rpc_message msg = {
2044                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2045                 .rpc_cred = state->owner->so_cred,
2046         };
2047         struct rpc_task_setup task_setup_data = {
2048                 .rpc_client = server->client,
2049                 .rpc_message = &msg,
2050                 .callback_ops = &nfs4_close_ops,
2051                 .workqueue = nfsiod_workqueue,
2052                 .flags = RPC_TASK_ASYNC,
2053         };
2054         int status = -ENOMEM;
2055
2056         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2057         if (calldata == NULL)
2058                 goto out;
2059         calldata->inode = state->inode;
2060         calldata->state = state;
2061         calldata->arg.fh = NFS_FH(state->inode);
2062         calldata->arg.stateid = &state->open_stateid;
2063         /* Serialization for the sequence id */
2064         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2065         if (calldata->arg.seqid == NULL)
2066                 goto out_free_calldata;
2067         calldata->arg.fmode = 0;
2068         calldata->arg.bitmask = server->cache_consistency_bitmask;
2069         calldata->res.fattr = &calldata->fattr;
2070         calldata->res.seqid = calldata->arg.seqid;
2071         calldata->res.server = server;
2072         calldata->roc = roc;
2073         nfs_sb_active(calldata->inode->i_sb);
2074
2075         msg.rpc_argp = &calldata->arg;
2076         msg.rpc_resp = &calldata->res;
2077         task_setup_data.callback_data = calldata;
2078         task = rpc_run_task(&task_setup_data);
2079         if (IS_ERR(task))
2080                 return PTR_ERR(task);
2081         status = 0;
2082         if (wait)
2083                 status = rpc_wait_for_completion_task(task);
2084         rpc_put_task(task);
2085         return status;
2086 out_free_calldata:
2087         kfree(calldata);
2088 out:
2089         if (roc)
2090                 pnfs_roc_release(state->inode);
2091         nfs4_put_open_state(state);
2092         nfs4_put_state_owner(sp);
2093         return status;
2094 }
2095
2096 static struct inode *
2097 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2098 {
2099         struct nfs4_state *state;
2100
2101         /* Protect against concurrent sillydeletes */
2102         state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr, ctx->cred);
2103         if (IS_ERR(state))
2104                 return ERR_CAST(state);
2105         ctx->state = state;
2106         return igrab(state->inode);
2107 }
2108
2109 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2110 {
2111         if (ctx->state == NULL)
2112                 return;
2113         if (is_sync)
2114                 nfs4_close_sync(ctx->state, ctx->mode);
2115         else
2116                 nfs4_close_state(ctx->state, ctx->mode);
2117 }
2118
2119 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2120 {
2121         struct nfs4_server_caps_arg args = {
2122                 .fhandle = fhandle,
2123         };
2124         struct nfs4_server_caps_res res = {};
2125         struct rpc_message msg = {
2126                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2127                 .rpc_argp = &args,
2128                 .rpc_resp = &res,
2129         };
2130         int status;
2131
2132         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2133         if (status == 0) {
2134                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2135                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2136                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2137                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2138                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2139                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2140                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2141                         server->caps |= NFS_CAP_ACLS;
2142                 if (res.has_links != 0)
2143                         server->caps |= NFS_CAP_HARDLINKS;
2144                 if (res.has_symlinks != 0)
2145                         server->caps |= NFS_CAP_SYMLINKS;
2146                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2147                         server->caps |= NFS_CAP_FILEID;
2148                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2149                         server->caps |= NFS_CAP_MODE;
2150                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2151                         server->caps |= NFS_CAP_NLINK;
2152                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2153                         server->caps |= NFS_CAP_OWNER;
2154                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2155                         server->caps |= NFS_CAP_OWNER_GROUP;
2156                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2157                         server->caps |= NFS_CAP_ATIME;
2158                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2159                         server->caps |= NFS_CAP_CTIME;
2160                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2161                         server->caps |= NFS_CAP_MTIME;
2162
2163                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2164                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2165                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2166                 server->acl_bitmask = res.acl_bitmask;
2167         }
2168
2169         return status;
2170 }
2171
2172 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2173 {
2174         struct nfs4_exception exception = { };
2175         int err;
2176         do {
2177                 err = nfs4_handle_exception(server,
2178                                 _nfs4_server_capabilities(server, fhandle),
2179                                 &exception);
2180         } while (exception.retry);
2181         return err;
2182 }
2183
2184 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2185                 struct nfs_fsinfo *info)
2186 {
2187         struct nfs4_lookup_root_arg args = {
2188                 .bitmask = nfs4_fattr_bitmap,
2189         };
2190         struct nfs4_lookup_res res = {
2191                 .server = server,
2192                 .fattr = info->fattr,
2193                 .fh = fhandle,
2194         };
2195         struct rpc_message msg = {
2196                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2197                 .rpc_argp = &args,
2198                 .rpc_resp = &res,
2199         };
2200
2201         nfs_fattr_init(info->fattr);
2202         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2203 }
2204
2205 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2206                 struct nfs_fsinfo *info)
2207 {
2208         struct nfs4_exception exception = { };
2209         int err;
2210         do {
2211                 err = _nfs4_lookup_root(server, fhandle, info);
2212                 switch (err) {
2213                 case 0:
2214                 case -NFS4ERR_WRONGSEC:
2215                         break;
2216                 default:
2217                         err = nfs4_handle_exception(server, err, &exception);
2218                 }
2219         } while (exception.retry);
2220         return err;
2221 }
2222
2223 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2224                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2225 {
2226         struct rpc_auth *auth;
2227         int ret;
2228
2229         auth = rpcauth_create(flavor, server->client);
2230         if (!auth) {
2231                 ret = -EIO;
2232                 goto out;
2233         }
2234         ret = nfs4_lookup_root(server, fhandle, info);
2235 out:
2236         return ret;
2237 }
2238
2239 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2240                               struct nfs_fsinfo *info)
2241 {
2242         int i, len, status = 0;
2243         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2244
2245         len = gss_mech_list_pseudoflavors(&flav_array[0]);
2246         flav_array[len] = RPC_AUTH_NULL;
2247         len += 1;
2248
2249         for (i = 0; i < len; i++) {
2250                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2251                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2252                         continue;
2253                 break;
2254         }
2255         /*
2256          * -EACCESS could mean that the user doesn't have correct permissions
2257          * to access the mount.  It could also mean that we tried to mount
2258          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2259          * existing mount programs don't handle -EACCES very well so it should
2260          * be mapped to -EPERM instead.
2261          */
2262         if (status == -EACCES)
2263                 status = -EPERM;
2264         return status;
2265 }
2266
2267 /*
2268  * get the file handle for the "/" directory on the server
2269  */
2270 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2271                               struct nfs_fsinfo *info)
2272 {
2273         int minor_version = server->nfs_client->cl_minorversion;
2274         int status = nfs4_lookup_root(server, fhandle, info);
2275         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2276                 /*
2277                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2278                  * by nfs4_map_errors() as this function exits.
2279                  */
2280                 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2281         if (status == 0)
2282                 status = nfs4_server_capabilities(server, fhandle);
2283         if (status == 0)
2284                 status = nfs4_do_fsinfo(server, fhandle, info);
2285         return nfs4_map_errors(status);
2286 }
2287
2288 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
2289 /*
2290  * Get locations and (maybe) other attributes of a referral.
2291  * Note that we'll actually follow the referral later when
2292  * we detect fsid mismatch in inode revalidation
2293  */
2294 static int nfs4_get_referral(struct inode *dir, const struct qstr *name,
2295                              struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2296 {
2297         int status = -ENOMEM;
2298         struct page *page = NULL;
2299         struct nfs4_fs_locations *locations = NULL;
2300
2301         page = alloc_page(GFP_KERNEL);
2302         if (page == NULL)
2303                 goto out;
2304         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2305         if (locations == NULL)
2306                 goto out;
2307
2308         status = nfs4_proc_fs_locations(dir, name, locations, page);
2309         if (status != 0)
2310                 goto out;
2311         /* Make sure server returned a different fsid for the referral */
2312         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2313                 dprintk("%s: server did not return a different fsid for"
2314                         " a referral at %s\n", __func__, name->name);
2315                 status = -EIO;
2316                 goto out;
2317         }
2318         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2319         nfs_fixup_referral_attributes(&locations->fattr);
2320
2321         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2322         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2323         memset(fhandle, 0, sizeof(struct nfs_fh));
2324 out:
2325         if (page)
2326                 __free_page(page);
2327         kfree(locations);
2328         return status;
2329 }
2330
2331 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2332 {
2333         struct nfs4_getattr_arg args = {
2334                 .fh = fhandle,
2335                 .bitmask = server->attr_bitmask,
2336         };
2337         struct nfs4_getattr_res res = {
2338                 .fattr = fattr,
2339                 .server = server,
2340         };
2341         struct rpc_message msg = {
2342                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2343                 .rpc_argp = &args,
2344                 .rpc_resp = &res,
2345         };
2346         
2347         nfs_fattr_init(fattr);
2348         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2349 }
2350
2351 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2352 {
2353         struct nfs4_exception exception = { };
2354         int err;
2355         do {
2356                 err = nfs4_handle_exception(server,
2357                                 _nfs4_proc_getattr(server, fhandle, fattr),
2358                                 &exception);
2359         } while (exception.retry);
2360         return err;
2361 }
2362
2363 /* 
2364  * The file is not closed if it is opened due to the a request to change
2365  * the size of the file. The open call will not be needed once the
2366  * VFS layer lookup-intents are implemented.
2367  *
2368  * Close is called when the inode is destroyed.
2369  * If we haven't opened the file for O_WRONLY, we
2370  * need to in the size_change case to obtain a stateid.
2371  *
2372  * Got race?
2373  * Because OPEN is always done by name in nfsv4, it is
2374  * possible that we opened a different file by the same
2375  * name.  We can recognize this race condition, but we
2376  * can't do anything about it besides returning an error.
2377  *
2378  * This will be fixed with VFS changes (lookup-intent).
2379  */
2380 static int
2381 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2382                   struct iattr *sattr)
2383 {
2384         struct inode *inode = dentry->d_inode;
2385         struct rpc_cred *cred = NULL;
2386         struct nfs4_state *state = NULL;
2387         int status;
2388
2389         if (pnfs_ld_layoutret_on_setattr(inode))
2390                 pnfs_return_layout(inode);
2391
2392         nfs_fattr_init(fattr);
2393         
2394         /* Search for an existing open(O_WRITE) file */
2395         if (sattr->ia_valid & ATTR_FILE) {
2396                 struct nfs_open_context *ctx;
2397
2398                 ctx = nfs_file_open_context(sattr->ia_file);
2399                 if (ctx) {
2400                         cred = ctx->cred;
2401                         state = ctx->state;
2402                 }
2403         }
2404
2405         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2406         if (status == 0)
2407                 nfs_setattr_update_inode(inode, sattr);
2408         return status;
2409 }
2410
2411 static int _nfs4_proc_lookupfh(struct rpc_clnt *clnt, struct nfs_server *server,
2412                 const struct nfs_fh *dirfh, const struct qstr *name,
2413                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2414 {
2415         int                    status;
2416         struct nfs4_lookup_arg args = {
2417                 .bitmask = server->attr_bitmask,
2418                 .dir_fh = dirfh,
2419                 .name = name,
2420         };
2421         struct nfs4_lookup_res res = {
2422                 .server = server,
2423                 .fattr = fattr,
2424                 .fh = fhandle,
2425         };
2426         struct rpc_message msg = {
2427                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2428                 .rpc_argp = &args,
2429                 .rpc_resp = &res,
2430         };
2431
2432         nfs_fattr_init(fattr);
2433
2434         dprintk("NFS call  lookupfh %s\n", name->name);
2435         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2436         dprintk("NFS reply lookupfh: %d\n", status);
2437         return status;
2438 }
2439
2440 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
2441                               struct qstr *name, struct nfs_fh *fhandle,
2442                               struct nfs_fattr *fattr)
2443 {
2444         struct nfs4_exception exception = { };
2445         int err;
2446         do {
2447                 err = _nfs4_proc_lookupfh(server->client, server, dirfh, name, fhandle, fattr);
2448                 /* FIXME: !!!! */
2449                 if (err == -NFS4ERR_MOVED) {
2450                         err = -EREMOTE;
2451                         break;
2452                 }
2453                 err = nfs4_handle_exception(server, err, &exception);
2454         } while (exception.retry);
2455         return err;
2456 }
2457
2458 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2459                 const struct qstr *name, struct nfs_fh *fhandle,
2460                 struct nfs_fattr *fattr)
2461 {
2462         int status;
2463         
2464         dprintk("NFS call  lookup %s\n", name->name);
2465         status = _nfs4_proc_lookupfh(clnt, NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
2466         if (status == -NFS4ERR_MOVED)
2467                 status = nfs4_get_referral(dir, name, fattr, fhandle);
2468         dprintk("NFS reply lookup: %d\n", status);
2469         return status;
2470 }
2471
2472 void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr, struct nfs_fh *fh)
2473 {
2474         memset(fh, 0, sizeof(struct nfs_fh));
2475         fattr->fsid.major = 1;
2476         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2477                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_FSID | NFS_ATTR_FATTR_MOUNTPOINT;
2478         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2479         fattr->nlink = 2;
2480 }
2481
2482 static int nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, struct qstr *name,
2483                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2484 {
2485         struct nfs4_exception exception = { };
2486         int err;
2487         do {
2488                 err = nfs4_handle_exception(NFS_SERVER(dir),
2489                                 _nfs4_proc_lookup(clnt, dir, name, fhandle, fattr),
2490                                 &exception);
2491                 if (err == -EPERM)
2492                         nfs_fixup_secinfo_attributes(fattr, fhandle);
2493         } while (exception.retry);
2494         return err;
2495 }
2496
2497 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2498 {
2499         struct nfs_server *server = NFS_SERVER(inode);
2500         struct nfs4_accessargs args = {
2501                 .fh = NFS_FH(inode),
2502                 .bitmask = server->attr_bitmask,
2503         };
2504         struct nfs4_accessres res = {
2505                 .server = server,
2506         };
2507         struct rpc_message msg = {
2508                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2509                 .rpc_argp = &args,
2510                 .rpc_resp = &res,
2511                 .rpc_cred = entry->cred,
2512         };
2513         int mode = entry->mask;
2514         int status;
2515
2516         /*
2517          * Determine which access bits we want to ask for...
2518          */
2519         if (mode & MAY_READ)
2520                 args.access |= NFS4_ACCESS_READ;
2521         if (S_ISDIR(inode->i_mode)) {
2522                 if (mode & MAY_WRITE)
2523                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2524                 if (mode & MAY_EXEC)
2525                         args.access |= NFS4_ACCESS_LOOKUP;
2526         } else {
2527                 if (mode & MAY_WRITE)
2528                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2529                 if (mode & MAY_EXEC)
2530                         args.access |= NFS4_ACCESS_EXECUTE;
2531         }
2532
2533         res.fattr = nfs_alloc_fattr();
2534         if (res.fattr == NULL)
2535                 return -ENOMEM;
2536
2537         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2538         if (!status) {
2539                 entry->mask = 0;
2540                 if (res.access & NFS4_ACCESS_READ)
2541                         entry->mask |= MAY_READ;
2542                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2543                         entry->mask |= MAY_WRITE;
2544                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2545                         entry->mask |= MAY_EXEC;
2546                 nfs_refresh_inode(inode, res.fattr);
2547         }
2548         nfs_free_fattr(res.fattr);
2549         return status;
2550 }
2551
2552 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2553 {
2554         struct nfs4_exception exception = { };
2555         int err;
2556         do {
2557                 err = nfs4_handle_exception(NFS_SERVER(inode),
2558                                 _nfs4_proc_access(inode, entry),
2559                                 &exception);
2560         } while (exception.retry);
2561         return err;
2562 }
2563
2564 /*
2565  * TODO: For the time being, we don't try to get any attributes
2566  * along with any of the zero-copy operations READ, READDIR,
2567  * READLINK, WRITE.
2568  *
2569  * In the case of the first three, we want to put the GETATTR
2570  * after the read-type operation -- this is because it is hard
2571  * to predict the length of a GETATTR response in v4, and thus
2572  * align the READ data correctly.  This means that the GETATTR
2573  * may end up partially falling into the page cache, and we should
2574  * shift it into the 'tail' of the xdr_buf before processing.
2575  * To do this efficiently, we need to know the total length
2576  * of data received, which doesn't seem to be available outside
2577  * of the RPC layer.
2578  *
2579  * In the case of WRITE, we also want to put the GETATTR after
2580  * the operation -- in this case because we want to make sure
2581  * we get the post-operation mtime and size.  This means that
2582  * we can't use xdr_encode_pages() as written: we need a variant
2583  * of it which would leave room in the 'tail' iovec.
2584  *
2585  * Both of these changes to the XDR layer would in fact be quite
2586  * minor, but I decided to leave them for a subsequent patch.
2587  */
2588 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2589                 unsigned int pgbase, unsigned int pglen)
2590 {
2591         struct nfs4_readlink args = {
2592                 .fh       = NFS_FH(inode),
2593                 .pgbase   = pgbase,
2594                 .pglen    = pglen,
2595                 .pages    = &page,
2596         };
2597         struct nfs4_readlink_res res;
2598         struct rpc_message msg = {
2599                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2600                 .rpc_argp = &args,
2601                 .rpc_resp = &res,
2602         };
2603
2604         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2605 }
2606
2607 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2608                 unsigned int pgbase, unsigned int pglen)
2609 {
2610         struct nfs4_exception exception = { };
2611         int err;
2612         do {
2613                 err = nfs4_handle_exception(NFS_SERVER(inode),
2614                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2615                                 &exception);
2616         } while (exception.retry);
2617         return err;
2618 }
2619
2620 /*
2621  * Got race?
2622  * We will need to arrange for the VFS layer to provide an atomic open.
2623  * Until then, this create/open method is prone to inefficiency and race
2624  * conditions due to the lookup, create, and open VFS calls from sys_open()
2625  * placed on the wire.
2626  *
2627  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2628  * The file will be opened again in the subsequent VFS open call
2629  * (nfs4_proc_file_open).
2630  *
2631  * The open for read will just hang around to be used by any process that
2632  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2633  */
2634
2635 static int
2636 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2637                  int flags, struct nfs_open_context *ctx)
2638 {
2639         struct dentry *de = dentry;
2640         struct nfs4_state *state;
2641         struct rpc_cred *cred = NULL;
2642         fmode_t fmode = 0;
2643         int status = 0;
2644
2645         if (ctx != NULL) {
2646                 cred = ctx->cred;
2647                 de = ctx->dentry;
2648                 fmode = ctx->mode;
2649         }
2650         sattr->ia_mode &= ~current_umask();
2651         state = nfs4_do_open(dir, de, fmode, flags, sattr, cred);
2652         d_drop(dentry);
2653         if (IS_ERR(state)) {
2654                 status = PTR_ERR(state);
2655                 goto out;
2656         }
2657         d_add(dentry, igrab(state->inode));
2658         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2659         if (ctx != NULL)
2660                 ctx->state = state;
2661         else
2662                 nfs4_close_sync(state, fmode);
2663 out:
2664         return status;
2665 }
2666
2667 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2668 {
2669         struct nfs_server *server = NFS_SERVER(dir);
2670         struct nfs_removeargs args = {
2671                 .fh = NFS_FH(dir),
2672                 .name.len = name->len,
2673                 .name.name = name->name,
2674                 .bitmask = server->attr_bitmask,
2675         };
2676         struct nfs_removeres res = {
2677                 .server = server,
2678         };
2679         struct rpc_message msg = {
2680                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2681                 .rpc_argp = &args,
2682                 .rpc_resp = &res,
2683         };
2684         int status = -ENOMEM;
2685
2686         res.dir_attr = nfs_alloc_fattr();
2687         if (res.dir_attr == NULL)
2688                 goto out;
2689
2690         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
2691         if (status == 0) {
2692                 update_changeattr(dir, &res.cinfo);
2693                 nfs_post_op_update_inode(dir, res.dir_attr);
2694         }
2695         nfs_free_fattr(res.dir_attr);
2696 out:
2697         return status;
2698 }
2699
2700 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2701 {
2702         struct nfs4_exception exception = { };
2703         int err;
2704         do {
2705                 err = nfs4_handle_exception(NFS_SERVER(dir),
2706                                 _nfs4_proc_remove(dir, name),
2707                                 &exception);
2708         } while (exception.retry);
2709         return err;
2710 }
2711
2712 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2713 {
2714         struct nfs_server *server = NFS_SERVER(dir);
2715         struct nfs_removeargs *args = msg->rpc_argp;
2716         struct nfs_removeres *res = msg->rpc_resp;
2717
2718         args->bitmask = server->cache_consistency_bitmask;
2719         res->server = server;
2720         res->seq_res.sr_slot = NULL;
2721         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2722 }
2723
2724 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2725 {
2726         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2727
2728         if (!nfs4_sequence_done(task, &res->seq_res))
2729                 return 0;
2730         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2731                 return 0;
2732         update_changeattr(dir, &res->cinfo);
2733         nfs_post_op_update_inode(dir, res->dir_attr);
2734         return 1;
2735 }
2736
2737 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2738 {
2739         struct nfs_server *server = NFS_SERVER(dir);
2740         struct nfs_renameargs *arg = msg->rpc_argp;
2741         struct nfs_renameres *res = msg->rpc_resp;
2742
2743         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2744         arg->bitmask = server->attr_bitmask;
2745         res->server = server;
2746 }
2747
2748 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2749                                  struct inode *new_dir)
2750 {
2751         struct nfs_renameres *res = task->tk_msg.rpc_resp;
2752
2753         if (!nfs4_sequence_done(task, &res->seq_res))
2754                 return 0;
2755         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2756                 return 0;
2757
2758         update_changeattr(old_dir, &res->old_cinfo);
2759         nfs_post_op_update_inode(old_dir, res->old_fattr);
2760         update_changeattr(new_dir, &res->new_cinfo);
2761         nfs_post_op_update_inode(new_dir, res->new_fattr);
2762         return 1;
2763 }
2764
2765 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2766                 struct inode *new_dir, struct qstr *new_name)
2767 {
2768         struct nfs_server *server = NFS_SERVER(old_dir);
2769         struct nfs_renameargs arg = {
2770                 .old_dir = NFS_FH(old_dir),
2771                 .new_dir = NFS_FH(new_dir),
2772                 .old_name = old_name,
2773                 .new_name = new_name,
2774                 .bitmask = server->attr_bitmask,
2775         };
2776         struct nfs_renameres res = {
2777                 .server = server,
2778         };
2779         struct rpc_message msg = {
2780                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2781                 .rpc_argp = &arg,
2782                 .rpc_resp = &res,
2783         };
2784         int status = -ENOMEM;
2785         
2786         res.old_fattr = nfs_alloc_fattr();
2787         res.new_fattr = nfs_alloc_fattr();
2788         if (res.old_fattr == NULL || res.new_fattr == NULL)
2789                 goto out;
2790
2791         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2792         if (!status) {
2793                 update_changeattr(old_dir, &res.old_cinfo);
2794                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2795                 update_changeattr(new_dir, &res.new_cinfo);
2796                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2797         }
2798 out:
2799         nfs_free_fattr(res.new_fattr);
2800         nfs_free_fattr(res.old_fattr);
2801         return status;
2802 }
2803
2804 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2805                 struct inode *new_dir, struct qstr *new_name)
2806 {
2807         struct nfs4_exception exception = { };
2808         int err;
2809         do {
2810                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2811                                 _nfs4_proc_rename(old_dir, old_name,
2812                                         new_dir, new_name),
2813                                 &exception);
2814         } while (exception.retry);
2815         return err;
2816 }
2817
2818 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2819 {
2820         struct nfs_server *server = NFS_SERVER(inode);
2821         struct nfs4_link_arg arg = {
2822                 .fh     = NFS_FH(inode),
2823                 .dir_fh = NFS_FH(dir),
2824                 .name   = name,
2825                 .bitmask = server->attr_bitmask,
2826         };
2827         struct nfs4_link_res res = {
2828                 .server = server,
2829         };
2830         struct rpc_message msg = {
2831                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2832                 .rpc_argp = &arg,
2833                 .rpc_resp = &res,
2834         };
2835         int status = -ENOMEM;
2836
2837         res.fattr = nfs_alloc_fattr();
2838         res.dir_attr = nfs_alloc_fattr();
2839         if (res.fattr == NULL || res.dir_attr == NULL)
2840                 goto out;
2841
2842         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2843         if (!status) {
2844                 update_changeattr(dir, &res.cinfo);
2845                 nfs_post_op_update_inode(dir, res.dir_attr);
2846                 nfs_post_op_update_inode(inode, res.fattr);
2847         }
2848 out:
2849         nfs_free_fattr(res.dir_attr);
2850         nfs_free_fattr(res.fattr);
2851         return status;
2852 }
2853
2854 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2855 {
2856         struct nfs4_exception exception = { };
2857         int err;
2858         do {
2859                 err = nfs4_handle_exception(NFS_SERVER(inode),
2860                                 _nfs4_proc_link(inode, dir, name),
2861                                 &exception);
2862         } while (exception.retry);
2863         return err;
2864 }
2865
2866 struct nfs4_createdata {
2867         struct rpc_message msg;
2868         struct nfs4_create_arg arg;
2869         struct nfs4_create_res res;
2870         struct nfs_fh fh;
2871         struct nfs_fattr fattr;
2872         struct nfs_fattr dir_fattr;
2873 };
2874
2875 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2876                 struct qstr *name, struct iattr *sattr, u32 ftype)
2877 {
2878         struct nfs4_createdata *data;
2879
2880         data = kzalloc(sizeof(*data), GFP_KERNEL);
2881         if (data != NULL) {
2882                 struct nfs_server *server = NFS_SERVER(dir);
2883
2884                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2885                 data->msg.rpc_argp = &data->arg;
2886                 data->msg.rpc_resp = &data->res;
2887                 data->arg.dir_fh = NFS_FH(dir);
2888                 data->arg.server = server;
2889                 data->arg.name = name;
2890                 data->arg.attrs = sattr;
2891                 data->arg.ftype = ftype;
2892                 data->arg.bitmask = server->attr_bitmask;
2893                 data->res.server = server;
2894                 data->res.fh = &data->fh;
2895                 data->res.fattr = &data->fattr;
2896                 data->res.dir_fattr = &data->dir_fattr;
2897                 nfs_fattr_init(data->res.fattr);
2898                 nfs_fattr_init(data->res.dir_fattr);
2899         }
2900         return data;
2901 }
2902
2903 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2904 {
2905         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
2906                                     &data->arg.seq_args, &data->res.seq_res, 1);
2907         if (status == 0) {
2908                 update_changeattr(dir, &data->res.dir_cinfo);
2909                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2910                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2911         }
2912         return status;
2913 }
2914
2915 static void nfs4_free_createdata(struct nfs4_createdata *data)
2916 {
2917         kfree(data);
2918 }
2919
2920 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2921                 struct page *page, unsigned int len, struct iattr *sattr)
2922 {
2923         struct nfs4_createdata *data;
2924         int status = -ENAMETOOLONG;
2925
2926         if (len > NFS4_MAXPATHLEN)
2927                 goto out;
2928
2929         status = -ENOMEM;
2930         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2931         if (data == NULL)
2932                 goto out;
2933
2934         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2935         data->arg.u.symlink.pages = &page;
2936         data->arg.u.symlink.len = len;
2937         
2938         status = nfs4_do_create(dir, dentry, data);
2939
2940         nfs4_free_createdata(data);
2941 out:
2942         return status;
2943 }
2944
2945 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2946                 struct page *page, unsigned int len, struct iattr *sattr)
2947 {
2948         struct nfs4_exception exception = { };
2949         int err;
2950         do {
2951                 err = nfs4_handle_exception(NFS_SERVER(dir),
2952                                 _nfs4_proc_symlink(dir, dentry, page,
2953                                                         len, sattr),
2954                                 &exception);
2955         } while (exception.retry);
2956         return err;
2957 }
2958
2959 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2960                 struct iattr *sattr)
2961 {
2962         struct nfs4_createdata *data;
2963         int status = -ENOMEM;
2964
2965         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2966         if (data == NULL)
2967                 goto out;
2968
2969         status = nfs4_do_create(dir, dentry, data);
2970
2971         nfs4_free_createdata(data);
2972 out:
2973         return status;
2974 }
2975
2976 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2977                 struct iattr *sattr)
2978 {
2979         struct nfs4_exception exception = { };
2980         int err;
2981
2982         sattr->ia_mode &= ~current_umask();
2983         do {
2984                 err = nfs4_handle_exception(NFS_SERVER(dir),
2985                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2986                                 &exception);
2987         } while (exception.retry);
2988         return err;
2989 }
2990
2991 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2992                 u64 cookie, struct page **pages, unsigned int count, int plus)
2993 {
2994         struct inode            *dir = dentry->d_inode;
2995         struct nfs4_readdir_arg args = {
2996                 .fh = NFS_FH(dir),
2997                 .pages = pages,
2998                 .pgbase = 0,
2999                 .count = count,
3000                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3001                 .plus = plus,
3002         };
3003         struct nfs4_readdir_res res;
3004         struct rpc_message msg = {
3005                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3006                 .rpc_argp = &args,
3007                 .rpc_resp = &res,
3008                 .rpc_cred = cred,
3009         };
3010         int                     status;
3011
3012         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3013                         dentry->d_parent->d_name.name,
3014                         dentry->d_name.name,
3015                         (unsigned long long)cookie);
3016         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
3017         res.pgbase = args.pgbase;
3018         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3019         if (status >= 0) {
3020                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
3021                 status += args.pgbase;
3022         }
3023
3024         nfs_invalidate_atime(dir);
3025
3026         dprintk("%s: returns %d\n", __func__, status);
3027         return status;
3028 }
3029
3030 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3031                 u64 cookie, struct page **pages, unsigned int count, int plus)
3032 {
3033         struct nfs4_exception exception = { };
3034         int err;
3035         do {
3036                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3037                                 _nfs4_proc_readdir(dentry, cred, cookie,
3038                                         pages, count, plus),
3039                                 &exception);
3040         } while (exception.retry);
3041         return err;
3042 }
3043
3044 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3045                 struct iattr *sattr, dev_t rdev)
3046 {
3047         struct nfs4_createdata *data;
3048         int mode = sattr->ia_mode;
3049         int status = -ENOMEM;
3050
3051         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
3052         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
3053
3054         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3055         if (data == NULL)
3056                 goto out;
3057
3058         if (S_ISFIFO(mode))
3059                 data->arg.ftype = NF4FIFO;
3060         else if (S_ISBLK(mode)) {
3061                 data->arg.ftype = NF4BLK;
3062                 data->arg.u.device.specdata1 = MAJOR(rdev);
3063                 data->arg.u.device.specdata2 = MINOR(rdev);
3064         }
3065         else if (S_ISCHR(mode)) {
3066                 data->arg.ftype = NF4CHR;
3067                 data->arg.u.device.specdata1 = MAJOR(rdev);
3068                 data->arg.u.device.specdata2 = MINOR(rdev);
3069         }
3070         
3071         status = nfs4_do_create(dir, dentry, data);
3072
3073         nfs4_free_createdata(data);
3074 out:
3075         return status;
3076 }
3077
3078 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3079                 struct iattr *sattr, dev_t rdev)
3080 {
3081         struct nfs4_exception exception = { };
3082         int err;
3083
3084         sattr->ia_mode &= ~current_umask();
3085         do {
3086                 err = nfs4_handle_exception(NFS_SERVER(dir),
3087                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3088                                 &exception);
3089         } while (exception.retry);
3090         return err;
3091 }
3092
3093 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3094                  struct nfs_fsstat *fsstat)
3095 {
3096         struct nfs4_statfs_arg args = {
3097                 .fh = fhandle,
3098                 .bitmask = server->attr_bitmask,
3099         };
3100         struct nfs4_statfs_res res = {
3101                 .fsstat = fsstat,
3102         };
3103         struct rpc_message msg = {
3104                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3105                 .rpc_argp = &args,
3106                 .rpc_resp = &res,
3107         };
3108
3109         nfs_fattr_init(fsstat->fattr);
3110         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3111 }
3112
3113 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3114 {
3115         struct nfs4_exception exception = { };
3116         int err;
3117         do {
3118                 err = nfs4_handle_exception(server,
3119                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3120                                 &exception);
3121         } while (exception.retry);
3122         return err;
3123 }
3124
3125 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3126                 struct nfs_fsinfo *fsinfo)
3127 {
3128         struct nfs4_fsinfo_arg args = {
3129                 .fh = fhandle,
3130                 .bitmask = server->attr_bitmask,
3131         };
3132         struct nfs4_fsinfo_res res = {
3133                 .fsinfo = fsinfo,
3134         };
3135         struct rpc_message msg = {
3136                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3137                 .rpc_argp = &args,
3138                 .rpc_resp = &res,
3139         };
3140
3141         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3142 }
3143
3144 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3145 {
3146         struct nfs4_exception exception = { };
3147         int err;
3148
3149         do {
3150                 err = nfs4_handle_exception(server,
3151                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3152                                 &exception);
3153         } while (exception.retry);
3154         return err;
3155 }
3156
3157 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3158 {
3159         nfs_fattr_init(fsinfo->fattr);
3160         return nfs4_do_fsinfo(server, fhandle, fsinfo);
3161 }
3162
3163 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3164                 struct nfs_pathconf *pathconf)
3165 {
3166         struct nfs4_pathconf_arg args = {
3167                 .fh = fhandle,
3168                 .bitmask = server->attr_bitmask,
3169         };
3170         struct nfs4_pathconf_res res = {
3171                 .pathconf = pathconf,
3172         };
3173         struct rpc_message msg = {
3174                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3175                 .rpc_argp = &args,
3176                 .rpc_resp = &res,
3177         };
3178
3179         /* None of the pathconf attributes are mandatory to implement */
3180         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3181                 memset(pathconf, 0, sizeof(*pathconf));
3182                 return 0;
3183         }
3184
3185         nfs_fattr_init(pathconf->fattr);
3186         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3187 }
3188
3189 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3190                 struct nfs_pathconf *pathconf)
3191 {
3192         struct nfs4_exception exception = { };
3193         int err;
3194
3195         do {
3196                 err = nfs4_handle_exception(server,
3197                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3198                                 &exception);
3199         } while (exception.retry);
3200         return err;
3201 }
3202
3203 void __nfs4_read_done_cb(struct nfs_read_data *data)
3204 {
3205         nfs_invalidate_atime(data->inode);
3206 }
3207
3208 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3209 {
3210         struct nfs_server *server = NFS_SERVER(data->inode);
3211
3212         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3213                 nfs_restart_rpc(task, server->nfs_client);
3214                 return -EAGAIN;
3215         }
3216
3217         __nfs4_read_done_cb(data);
3218         if (task->tk_status > 0)
3219                 renew_lease(server, data->timestamp);
3220         return 0;
3221 }
3222
3223 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3224 {
3225
3226         dprintk("--> %s\n", __func__);
3227
3228         if (!nfs4_sequence_done(task, &data->res.seq_res))
3229                 return -EAGAIN;
3230
3231         return data->read_done_cb ? data->read_done_cb(task, data) :
3232                                     nfs4_read_done_cb(task, data);
3233 }
3234
3235 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3236 {
3237         data->timestamp   = jiffies;
3238         data->read_done_cb = nfs4_read_done_cb;
3239         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3240 }
3241
3242 /* Reset the the nfs_read_data to send the read to the MDS. */
3243 void nfs4_reset_read(struct rpc_task *task, struct nfs_read_data *data)
3244 {
3245         dprintk("%s Reset task for i/o through\n", __func__);
3246         put_lseg(data->lseg);
3247         data->lseg = NULL;
3248         /* offsets will differ in the dense stripe case */
3249         data->args.offset = data->mds_offset;
3250         data->ds_clp = NULL;
3251         data->args.fh     = NFS_FH(data->inode);
3252         data->read_done_cb = nfs4_read_done_cb;
3253         task->tk_ops = data->mds_ops;
3254         rpc_task_reset_client(task, NFS_CLIENT(data->inode));
3255 }
3256 EXPORT_SYMBOL_GPL(nfs4_reset_read);
3257
3258 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3259 {
3260         struct inode *inode = data->inode;
3261         
3262         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3263                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3264                 return -EAGAIN;
3265         }
3266         if (task->tk_status >= 0) {
3267                 renew_lease(NFS_SERVER(inode), data->timestamp);
3268                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3269         }
3270         return 0;
3271 }
3272
3273 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3274 {
3275         if (!nfs4_sequence_done(task, &data->res.seq_res))
3276                 return -EAGAIN;
3277         return data->write_done_cb ? data->write_done_cb(task, data) :
3278                 nfs4_write_done_cb(task, data);
3279 }
3280
3281 /* Reset the the nfs_write_data to send the write to the MDS. */
3282 void nfs4_reset_write(struct rpc_task *task, struct nfs_write_data *data)
3283 {
3284         dprintk("%s Reset task for i/o through\n", __func__);
3285         put_lseg(data->lseg);
3286         data->lseg          = NULL;
3287         data->ds_clp        = NULL;
3288         data->write_done_cb = nfs4_write_done_cb;
3289         data->args.fh       = NFS_FH(data->inode);
3290         data->args.bitmask  = data->res.server->cache_consistency_bitmask;
3291         data->args.offset   = data->mds_offset;
3292         data->res.fattr     = &data->fattr;
3293         task->tk_ops        = data->mds_ops;
3294         rpc_task_reset_client(task, NFS_CLIENT(data->inode));
3295 }
3296 EXPORT_SYMBOL_GPL(nfs4_reset_write);
3297
3298 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3299 {
3300         struct nfs_server *server = NFS_SERVER(data->inode);
3301
3302         if (data->lseg) {
3303                 data->args.bitmask = NULL;
3304                 data->res.fattr = NULL;
3305         } else
3306                 data->args.bitmask = server->cache_consistency_bitmask;
3307         if (!data->write_done_cb)
3308                 data->write_done_cb = nfs4_write_done_cb;
3309         data->res.server = server;
3310         data->timestamp   = jiffies;
3311
3312         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3313 }
3314
3315 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3316 {
3317         struct inode *inode = data->inode;
3318
3319         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3320                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3321                 return -EAGAIN;
3322         }
3323         nfs_refresh_inode(inode, data->res.fattr);
3324         return 0;
3325 }
3326
3327 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3328 {
3329         if (!nfs4_sequence_done(task, &data->res.seq_res))
3330                 return -EAGAIN;
3331         return data->write_done_cb(task, data);
3332 }
3333
3334 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3335 {
3336         struct nfs_server *server = NFS_SERVER(data->inode);
3337
3338         if (data->lseg) {
3339                 data->args.bitmask = NULL;
3340                 data->res.fattr = NULL;
3341         } else
3342                 data->args.bitmask = server->cache_consistency_bitmask;
3343         if (!data->write_done_cb)
3344                 data->write_done_cb = nfs4_commit_done_cb;
3345         data->res.server = server;
3346         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3347 }
3348
3349 struct nfs4_renewdata {
3350         struct nfs_client       *client;
3351         unsigned long           timestamp;
3352 };
3353
3354 /*
3355  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3356  * standalone procedure for queueing an asynchronous RENEW.
3357  */
3358 static void nfs4_renew_release(void *calldata)
3359 {
3360         struct nfs4_renewdata *data = calldata;
3361         struct nfs_client *clp = data->client;
3362
3363         if (atomic_read(&clp->cl_count) > 1)
3364                 nfs4_schedule_state_renewal(clp);
3365         nfs_put_client(clp);
3366         kfree(data);
3367 }
3368
3369 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3370 {
3371         struct nfs4_renewdata *data = calldata;
3372         struct nfs_client *clp = data->client;
3373         unsigned long timestamp = data->timestamp;
3374
3375         if (task->tk_status < 0) {
3376                 /* Unless we're shutting down, schedule state recovery! */
3377                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) != 0)
3378                         nfs4_schedule_lease_recovery(clp);
3379                 return;
3380         }
3381         do_renew_lease(clp, timestamp);
3382 }
3383
3384 static const struct rpc_call_ops nfs4_renew_ops = {
3385         .rpc_call_done = nfs4_renew_done,
3386         .rpc_release = nfs4_renew_release,
3387 };
3388
3389 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
3390 {
3391         struct rpc_message msg = {
3392                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3393                 .rpc_argp       = clp,
3394                 .rpc_cred       = cred,
3395         };
3396         struct nfs4_renewdata *data;
3397
3398         if (!atomic_inc_not_zero(&clp->cl_count))
3399                 return -EIO;
3400         data = kmalloc(sizeof(*data), GFP_NOFS);
3401         if (data == NULL)
3402                 return -ENOMEM;
3403         data->client = clp;
3404         data->timestamp = jiffies;
3405         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3406                         &nfs4_renew_ops, data);
3407 }
3408
3409 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3410 {
3411         struct rpc_message msg = {
3412                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3413                 .rpc_argp       = clp,
3414                 .rpc_cred       = cred,
3415         };
3416         unsigned long now = jiffies;
3417         int status;
3418
3419         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3420         if (status < 0)
3421                 return status;
3422         do_renew_lease(clp, now);
3423         return 0;
3424 }
3425
3426 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3427 {
3428         return (server->caps & NFS_CAP_ACLS)
3429                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3430                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3431 }
3432
3433 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3434  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3435  * the stack.
3436  */
3437 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3438
3439 static void buf_to_pages(const void *buf, size_t buflen,
3440                 struct page **pages, unsigned int *pgbase)
3441 {
3442         const void *p = buf;
3443
3444         *pgbase = offset_in_page(buf);
3445         p -= *pgbase;
3446         while (p < buf + buflen) {
3447                 *(pages++) = virt_to_page(p);
3448                 p += PAGE_CACHE_SIZE;
3449         }
3450 }
3451
3452 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3453                 struct page **pages, unsigned int *pgbase)
3454 {
3455         struct page *newpage, **spages;
3456         int rc = 0;
3457         size_t len;
3458         spages = pages;
3459
3460         do {
3461                 len = min_t(size_t, PAGE_CACHE_SIZE, buflen);
3462                 newpage = alloc_page(GFP_KERNEL);
3463
3464                 if (newpage == NULL)
3465                         goto unwind;
3466                 memcpy(page_address(newpage), buf, len);
3467                 buf += len;
3468                 buflen -= len;
3469                 *pages++ = newpage;
3470                 rc++;
3471         } while (buflen != 0);
3472
3473         return rc;
3474
3475 unwind:
3476         for(; rc > 0; rc--)
3477                 __free_page(spages[rc-1]);
3478         return -ENOMEM;
3479 }
3480
3481 struct nfs4_cached_acl {
3482         int cached;
3483         size_t len;
3484         char data[0];
3485 };
3486
3487 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3488 {
3489         struct nfs_inode *nfsi = NFS_I(inode);
3490
3491         spin_lock(&inode->i_lock);
3492         kfree(nfsi->nfs4_acl);
3493         nfsi->nfs4_acl = acl;
3494         spin_unlock(&inode->i_lock);
3495 }
3496
3497 static void nfs4_zap_acl_attr(struct inode *inode)
3498 {
3499         nfs4_set_cached_acl(inode, NULL);
3500 }
3501
3502 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3503 {
3504         struct nfs_inode *nfsi = NFS_I(inode);
3505         struct nfs4_cached_acl *acl;
3506         int ret = -ENOENT;
3507
3508         spin_lock(&inode->i_lock);
3509         acl = nfsi->nfs4_acl;
3510         if (acl == NULL)
3511                 goto out;
3512         if (buf == NULL) /* user is just asking for length */
3513                 goto out_len;
3514         if (acl->cached == 0)
3515                 goto out;
3516         ret = -ERANGE; /* see getxattr(2) man page */
3517         if (acl->len > buflen)
3518                 goto out;
3519         memcpy(buf, acl->data, acl->len);
3520 out_len:
3521         ret = acl->len;
3522 out:
3523         spin_unlock(&inode->i_lock);
3524         return ret;
3525 }
3526
3527 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
3528 {
3529         struct nfs4_cached_acl *acl;
3530
3531         if (buf && acl_len <= PAGE_SIZE) {
3532                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3533                 if (acl == NULL)
3534                         goto out;
3535                 acl->cached = 1;
3536                 memcpy(acl->data, buf, acl_len);
3537         } else {
3538                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3539                 if (acl == NULL)
3540                         goto out;
3541                 acl->cached = 0;
3542         }
3543         acl->len = acl_len;
3544 out:
3545         nfs4_set_cached_acl(inode, acl);
3546 }
3547
3548 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3549 {
3550         struct page *pages[NFS4ACL_MAXPAGES];
3551         struct nfs_getaclargs args = {
3552                 .fh = NFS_FH(inode),
3553                 .acl_pages = pages,
3554                 .acl_len = buflen,
3555         };
3556         struct nfs_getaclres res = {
3557                 .acl_len = buflen,
3558         };
3559         void *resp_buf;
3560         struct rpc_message msg = {
3561                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3562                 .rpc_argp = &args,
3563                 .rpc_resp = &res,
3564         };
3565         struct page *localpage = NULL;
3566         int ret;
3567
3568         if (buflen < PAGE_SIZE) {
3569                 /* As long as we're doing a round trip to the server anyway,
3570                  * let's be prepared for a page of acl data. */
3571                 localpage = alloc_page(GFP_KERNEL);
3572                 resp_buf = page_address(localpage);
3573                 if (localpage == NULL)
3574                         return -ENOMEM;
3575                 args.acl_pages[0] = localpage;
3576                 args.acl_pgbase = 0;
3577                 args.acl_len = PAGE_SIZE;
3578         } else {
3579                 resp_buf = buf;
3580                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
3581         }
3582         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3583         if (ret)
3584                 goto out_free;
3585         if (res.acl_len > args.acl_len)
3586                 nfs4_write_cached_acl(inode, NULL, res.acl_len);
3587         else
3588                 nfs4_write_cached_acl(inode, resp_buf, res.acl_len);
3589         if (buf) {
3590                 ret = -ERANGE;
3591                 if (res.acl_len > buflen)
3592                         goto out_free;
3593                 if (localpage)
3594                         memcpy(buf, resp_buf, res.acl_len);
3595         }
3596         ret = res.acl_len;
3597 out_free:
3598         if (localpage)
3599                 __free_page(localpage);
3600         return ret;
3601 }
3602
3603 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3604 {
3605         struct nfs4_exception exception = { };
3606         ssize_t ret;
3607         do {
3608                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3609                 if (ret >= 0)
3610                         break;
3611                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3612         } while (exception.retry);
3613         return ret;
3614 }
3615
3616 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3617 {
3618         struct nfs_server *server = NFS_SERVER(inode);
3619         int ret;
3620
3621         if (!nfs4_server_supports_acls(server))
3622                 return -EOPNOTSUPP;
3623         ret = nfs_revalidate_inode(server, inode);
3624         if (ret < 0)
3625                 return ret;
3626         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3627                 nfs_zap_acl_cache(inode);
3628         ret = nfs4_read_cached_acl(inode, buf, buflen);
3629         if (ret != -ENOENT)
3630                 return ret;
3631         return nfs4_get_acl_uncached(inode, buf, buflen);
3632 }
3633
3634 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3635 {
3636         struct nfs_server *server = NFS_SERVER(inode);
3637         struct page *pages[NFS4ACL_MAXPAGES];
3638         struct nfs_setaclargs arg = {
3639                 .fh             = NFS_FH(inode),
3640                 .acl_pages      = pages,
3641                 .acl_len        = buflen,
3642         };
3643         struct nfs_setaclres res;
3644         struct rpc_message msg = {
3645                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3646                 .rpc_argp       = &arg,
3647                 .rpc_resp       = &res,
3648         };
3649         int ret, i;
3650
3651         if (!nfs4_server_supports_acls(server))
3652                 return -EOPNOTSUPP;
3653         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3654         if (i < 0)
3655                 return i;
3656         nfs_inode_return_delegation(inode);
3657         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3658
3659         /*
3660          * Free each page after tx, so the only ref left is
3661          * held by the network stack
3662          */
3663         for (; i > 0; i--)
3664                 put_page(pages[i-1]);
3665
3666         /*
3667          * Acl update can result in inode attribute update.
3668          * so mark the attribute cache invalid.
3669          */
3670         spin_lock(&inode->i_lock);
3671         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3672         spin_unlock(&inode->i_lock);
3673         nfs_access_zap_cache(inode);
3674         nfs_zap_acl_cache(inode);
3675         return ret;
3676 }
3677
3678 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3679 {
3680         struct nfs4_exception exception = { };
3681         int err;
3682         do {
3683                 err = nfs4_handle_exception(NFS_SERVER(inode),
3684                                 __nfs4_proc_set_acl(inode, buf, buflen),
3685                                 &exception);
3686         } while (exception.retry);
3687         return err;
3688 }
3689
3690 static int
3691 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3692 {
3693         struct nfs_client *clp = server->nfs_client;
3694
3695         if (task->tk_status >= 0)
3696                 return 0;
3697         switch(task->tk_status) {
3698                 case -NFS4ERR_ADMIN_REVOKED:
3699                 case -NFS4ERR_BAD_STATEID:
3700                 case -NFS4ERR_OPENMODE:
3701                         if (state == NULL)
3702                                 break;
3703                         nfs4_schedule_stateid_recovery(server, state);
3704                         goto wait_on_recovery;
3705                 case -NFS4ERR_EXPIRED:
3706                         if (state != NULL)
3707                                 nfs4_schedule_stateid_recovery(server, state);
3708                 case -NFS4ERR_STALE_STATEID:
3709                 case -NFS4ERR_STALE_CLIENTID:
3710                         nfs4_schedule_lease_recovery(clp);
3711                         goto wait_on_recovery;
3712 #if defined(CONFIG_NFS_V4_1)
3713                 case -NFS4ERR_BADSESSION:
3714                 case -NFS4ERR_BADSLOT:
3715                 case -NFS4ERR_BAD_HIGH_SLOT:
3716                 case -NFS4ERR_DEADSESSION:
3717                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3718                 case -NFS4ERR_SEQ_FALSE_RETRY:
3719                 case -NFS4ERR_SEQ_MISORDERED:
3720                         dprintk("%s ERROR %d, Reset session\n", __func__,
3721                                 task->tk_status);
3722                         nfs4_schedule_session_recovery(clp->cl_session);
3723                         task->tk_status = 0;
3724                         return -EAGAIN;
3725 #endif /* CONFIG_NFS_V4_1 */
3726                 case -NFS4ERR_DELAY:
3727                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3728                 case -NFS4ERR_GRACE:
3729                 case -EKEYEXPIRED:
3730                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3731                         task->tk_status = 0;
3732                         return -EAGAIN;
3733                 case -NFS4ERR_RETRY_UNCACHED_REP:
3734                 case -NFS4ERR_OLD_STATEID:
3735                         task->tk_status = 0;
3736                         return -EAGAIN;
3737         }
3738         task->tk_status = nfs4_map_errors(task->tk_status);
3739         return 0;
3740 wait_on_recovery:
3741         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3742         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3743                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3744         task->tk_status = 0;
3745         return -EAGAIN;
3746 }
3747
3748 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
3749                 unsigned short port, struct rpc_cred *cred,
3750                 struct nfs4_setclientid_res *res)
3751 {
3752         nfs4_verifier sc_verifier;
3753         struct nfs4_setclientid setclientid = {
3754                 .sc_verifier = &sc_verifier,
3755                 .sc_prog = program,
3756                 .sc_cb_ident = clp->cl_cb_ident,
3757         };
3758         struct rpc_message msg = {
3759                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3760                 .rpc_argp = &setclientid,
3761                 .rpc_resp = res,
3762                 .rpc_cred = cred,
3763         };
3764         __be32 *p;
3765         int loop = 0;
3766         int status;
3767
3768         p = (__be32*)sc_verifier.data;
3769         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3770         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3771
3772         for(;;) {
3773                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3774                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3775                                 clp->cl_ipaddr,
3776                                 rpc_peeraddr2str(clp->cl_rpcclient,
3777                                                         RPC_DISPLAY_ADDR),
3778                                 rpc_peeraddr2str(clp->cl_rpcclient,
3779                                                         RPC_DISPLAY_PROTO),
3780                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3781                                 clp->cl_id_uniquifier);
3782                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3783                                 sizeof(setclientid.sc_netid),
3784                                 rpc_peeraddr2str(clp->cl_rpcclient,
3785                                                         RPC_DISPLAY_NETID));
3786                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3787                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3788                                 clp->cl_ipaddr, port >> 8, port & 255);
3789
3790                 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3791                 if (status != -NFS4ERR_CLID_INUSE)
3792                         break;
3793                 if (loop != 0) {
3794                         ++clp->cl_id_uniquifier;
3795                         break;
3796                 }
3797                 ++loop;
3798                 ssleep(clp->cl_lease_time / HZ + 1);
3799         }
3800         return status;
3801 }
3802
3803 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3804                 struct nfs4_setclientid_res *arg,
3805                 struct rpc_cred *cred)
3806 {
3807         struct nfs_fsinfo fsinfo;
3808         struct rpc_message msg = {
3809                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3810                 .rpc_argp = arg,
3811                 .rpc_resp = &fsinfo,
3812                 .rpc_cred = cred,
3813         };
3814         unsigned long now;
3815         int status;
3816
3817         now = jiffies;
3818         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3819         if (status == 0) {
3820                 spin_lock(&clp->cl_lock);
3821                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3822                 clp->cl_last_renewal = now;
3823                 spin_unlock(&clp->cl_lock);
3824         }
3825         return status;
3826 }
3827
3828 struct nfs4_delegreturndata {
3829         struct nfs4_delegreturnargs args;
3830         struct nfs4_delegreturnres res;
3831         struct nfs_fh fh;
3832         nfs4_stateid stateid;
3833         unsigned long timestamp;
3834         struct nfs_fattr fattr;
3835         int rpc_status;
3836 };
3837
3838 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3839 {
3840         struct nfs4_delegreturndata *data = calldata;
3841
3842         if (!nfs4_sequence_done(task, &data->res.seq_res))
3843                 return;
3844
3845         switch (task->tk_status) {
3846         case -NFS4ERR_STALE_STATEID:
3847         case -NFS4ERR_EXPIRED:
3848         case 0:
3849                 renew_lease(data->res.server, data->timestamp);
3850                 break;
3851         default:
3852                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
3853                                 -EAGAIN) {
3854                         nfs_restart_rpc(task, data->res.server->nfs_client);
3855                         return;
3856                 }
3857         }
3858         data->rpc_status = task->tk_status;
3859 }
3860
3861 static void nfs4_delegreturn_release(void *calldata)
3862 {
3863         kfree(calldata);
3864 }
3865
3866 #if defined(CONFIG_NFS_V4_1)
3867 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3868 {
3869         struct nfs4_delegreturndata *d_data;
3870
3871         d_data = (struct nfs4_delegreturndata *)data;
3872
3873         if (nfs4_setup_sequence(d_data->res.server,
3874                                 &d_data->args.seq_args,
3875                                 &d_data->res.seq_res, 1, task))
3876                 return;
3877         rpc_call_start(task);
3878 }
3879 #endif /* CONFIG_NFS_V4_1 */
3880
3881 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3882 #if defined(CONFIG_NFS_V4_1)
3883         .rpc_call_prepare = nfs4_delegreturn_prepare,
3884 #endif /* CONFIG_NFS_V4_1 */
3885         .rpc_call_done = nfs4_delegreturn_done,
3886         .rpc_release = nfs4_delegreturn_release,
3887 };
3888
3889 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3890 {
3891         struct nfs4_delegreturndata *data;
3892         struct nfs_server *server = NFS_SERVER(inode);
3893         struct rpc_task *task;
3894         struct rpc_message msg = {
3895                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3896                 .rpc_cred = cred,
3897         };
3898         struct rpc_task_setup task_setup_data = {
3899                 .rpc_client = server->client,
3900                 .rpc_message = &msg,
3901                 .callback_ops = &nfs4_delegreturn_ops,
3902                 .flags = RPC_TASK_ASYNC,
3903         };
3904         int status = 0;
3905
3906         data = kzalloc(sizeof(*data), GFP_NOFS);
3907         if (data == NULL)
3908                 return -ENOMEM;
3909         data->args.fhandle = &data->fh;
3910         data->args.stateid = &data->stateid;
3911         data->args.bitmask = server->attr_bitmask;
3912         nfs_copy_fh(&data->fh, NFS_FH(inode));
3913         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3914         data->res.fattr = &data->fattr;
3915         data->res.server = server;
3916         nfs_fattr_init(data->res.fattr);
3917         data->timestamp = jiffies;
3918         data->rpc_status = 0;
3919
3920         task_setup_data.callback_data = data;
3921         msg.rpc_argp = &data->args;
3922         msg.rpc_resp = &data->res;
3923         task = rpc_run_task(&task_setup_data);
3924         if (IS_ERR(task))
3925                 return PTR_ERR(task);
3926         if (!issync)
3927                 goto out;
3928         status = nfs4_wait_for_completion_rpc_task(task);
3929         if (status != 0)
3930                 goto out;
3931         status = data->rpc_status;
3932         if (status != 0)
3933                 goto out;
3934         nfs_refresh_inode(inode, &data->fattr);
3935 out:
3936         rpc_put_task(task);
3937         return status;
3938 }
3939
3940 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3941 {
3942         struct nfs_server *server = NFS_SERVER(inode);
3943         struct nfs4_exception exception = { };
3944         int err;
3945         do {
3946                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3947                 switch (err) {
3948                         case -NFS4ERR_STALE_STATEID:
3949                         case -NFS4ERR_EXPIRED:
3950                         case 0:
3951                                 return 0;
3952                 }
3953                 err = nfs4_handle_exception(server, err, &exception);
3954         } while (exception.retry);
3955         return err;
3956 }
3957
3958 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3959 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3960
3961 /* 
3962  * sleep, with exponential backoff, and retry the LOCK operation. 
3963  */
3964 static unsigned long
3965 nfs4_set_lock_task_retry(unsigned long timeout)
3966 {
3967         schedule_timeout_killable(timeout);
3968         timeout <<= 1;
3969         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3970                 return NFS4_LOCK_MAXTIMEOUT;
3971         return timeout;
3972 }
3973
3974 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3975 {
3976         struct inode *inode = state->inode;
3977         struct nfs_server *server = NFS_SERVER(inode);
3978         struct nfs_client *clp = server->nfs_client;
3979         struct nfs_lockt_args arg = {
3980                 .fh = NFS_FH(inode),
3981                 .fl = request,
3982         };
3983         struct nfs_lockt_res res = {
3984                 .denied = request,
3985         };
3986         struct rpc_message msg = {
3987                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3988                 .rpc_argp       = &arg,
3989                 .rpc_resp       = &res,
3990                 .rpc_cred       = state->owner->so_cred,
3991         };
3992         struct nfs4_lock_state *lsp;
3993         int status;
3994
3995         arg.lock_owner.clientid = clp->cl_clientid;
3996         status = nfs4_set_lock_state(state, request);
3997         if (status != 0)
3998                 goto out;
3999         lsp = request->fl_u.nfs4_fl.owner;
4000         arg.lock_owner.id = lsp->ls_id.id;
4001         arg.lock_owner.s_dev = server->s_dev;
4002         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4003         switch (status) {
4004                 case 0:
4005                         request->fl_type = F_UNLCK;
4006                         break;
4007                 case -NFS4ERR_DENIED:
4008                         status = 0;
4009         }
4010         request->fl_ops->fl_release_private(request);
4011 out:
4012         return status;
4013 }
4014
4015 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4016 {
4017         struct nfs4_exception exception = { };
4018         int err;
4019
4020         do {
4021                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4022                                 _nfs4_proc_getlk(state, cmd, request),
4023                                 &exception);
4024         } while (exception.retry);
4025         return err;
4026 }
4027
4028 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4029 {
4030         int res = 0;
4031         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4032                 case FL_POSIX:
4033                         res = posix_lock_file_wait(file, fl);
4034                         break;
4035                 case FL_FLOCK:
4036                         res = flock_lock_file_wait(file, fl);
4037                         break;
4038                 default:
4039                         BUG();
4040         }
4041         return res;
4042 }
4043
4044 struct nfs4_unlockdata {
4045         struct nfs_locku_args arg;
4046         struct nfs_locku_res res;
4047         struct nfs4_lock_state *lsp;
4048         struct nfs_open_context *ctx;
4049         struct file_lock fl;
4050         const struct nfs_server *server;
4051         unsigned long timestamp;
4052 };
4053
4054 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4055                 struct nfs_open_context *ctx,
4056                 struct nfs4_lock_state *lsp,
4057                 struct nfs_seqid *seqid)
4058 {
4059         struct nfs4_unlockdata *p;
4060         struct inode *inode = lsp->ls_state->inode;
4061
4062         p = kzalloc(sizeof(*p), GFP_NOFS);
4063         if (p == NULL)
4064                 return NULL;
4065         p->arg.fh = NFS_FH(inode);
4066         p->arg.fl = &p->fl;
4067         p->arg.seqid = seqid;
4068         p->res.seqid = seqid;
4069         p->arg.stateid = &lsp->ls_stateid;
4070         p->lsp = lsp;
4071         atomic_inc(&lsp->ls_count);
4072         /* Ensure we don't close file until we're done freeing locks! */
4073         p->ctx = get_nfs_open_context(ctx);
4074         memcpy(&p->fl, fl, sizeof(p->fl));
4075         p->server = NFS_SERVER(inode);
4076         return p;
4077 }
4078
4079 static void nfs4_locku_release_calldata(void *data)
4080 {
4081         struct nfs4_unlockdata *calldata = data;
4082         nfs_free_seqid(calldata->arg.seqid);
4083         nfs4_put_lock_state(calldata->lsp);
4084         put_nfs_open_context(calldata->ctx);
4085         kfree(calldata);
4086 }
4087
4088 static void nfs4_locku_done(struct rpc_task *task, void *data)
4089 {
4090         struct nfs4_unlockdata *calldata = data;
4091
4092         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4093                 return;
4094         switch (task->tk_status) {
4095                 case 0:
4096                         memcpy(calldata->lsp->ls_stateid.data,
4097                                         calldata->res.stateid.data,
4098                                         sizeof(calldata->lsp->ls_stateid.data));
4099                         renew_lease(calldata->server, calldata->timestamp);
4100                         break;
4101                 case -NFS4ERR_BAD_STATEID:
4102                 case -NFS4ERR_OLD_STATEID:
4103                 case -NFS4ERR_STALE_STATEID:
4104                 case -NFS4ERR_EXPIRED:
4105                         break;
4106                 default:
4107                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4108                                 nfs_restart_rpc(task,
4109                                                  calldata->server->nfs_client);
4110         }
4111 }
4112
4113 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4114 {
4115         struct nfs4_unlockdata *calldata = data;
4116
4117         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4118                 return;
4119         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
4120                 /* Note: exit _without_ running nfs4_locku_done */
4121                 task->tk_action = NULL;
4122                 return;
4123         }
4124         calldata->timestamp = jiffies;
4125         if (nfs4_setup_sequence(calldata->server,
4126                                 &calldata->arg.seq_args,
4127                                 &calldata->res.seq_res, 1, task))
4128                 return;
4129         rpc_call_start(task);
4130 }
4131
4132 static const struct rpc_call_ops nfs4_locku_ops = {
4133         .rpc_call_prepare = nfs4_locku_prepare,
4134         .rpc_call_done = nfs4_locku_done,
4135         .rpc_release = nfs4_locku_release_calldata,
4136 };
4137
4138 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4139                 struct nfs_open_context *ctx,
4140                 struct nfs4_lock_state *lsp,
4141                 struct nfs_seqid *seqid)
4142 {
4143         struct nfs4_unlockdata *data;
4144         struct rpc_message msg = {
4145                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4146                 .rpc_cred = ctx->cred,
4147         };
4148         struct rpc_task_setup task_setup_data = {
4149                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4150                 .rpc_message = &msg,
4151                 .callback_ops = &nfs4_locku_ops,
4152                 .workqueue = nfsiod_workqueue,
4153                 .flags = RPC_TASK_ASYNC,
4154         };
4155
4156         /* Ensure this is an unlock - when canceling a lock, the
4157          * canceled lock is passed in, and it won't be an unlock.
4158          */
4159         fl->fl_type = F_UNLCK;
4160
4161         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4162         if (data == NULL) {
4163                 nfs_free_seqid(seqid);
4164                 return ERR_PTR(-ENOMEM);
4165         }
4166
4167         msg.rpc_argp = &data->arg;
4168         msg.rpc_resp = &data->res;
4169         task_setup_data.callback_data = data;
4170         return rpc_run_task(&task_setup_data);
4171 }
4172
4173 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4174 {
4175         struct nfs_inode *nfsi = NFS_I(state->inode);
4176         struct nfs_seqid *seqid;
4177         struct nfs4_lock_state *lsp;
4178         struct rpc_task *task;
4179         int status = 0;
4180         unsigned char fl_flags = request->fl_flags;
4181
4182         status = nfs4_set_lock_state(state, request);
4183         /* Unlock _before_ we do the RPC call */
4184         request->fl_flags |= FL_EXISTS;
4185         down_read(&nfsi->rwsem);
4186         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4187                 up_read(&nfsi->rwsem);
4188                 goto out;
4189         }
4190         up_read(&nfsi->rwsem);
4191         if (status != 0)
4192                 goto out;
4193         /* Is this a delegated lock? */
4194         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4195                 goto out;
4196         lsp = request->fl_u.nfs4_fl.owner;
4197         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4198         status = -ENOMEM;
4199         if (seqid == NULL)
4200                 goto out;
4201         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4202         status = PTR_ERR(task);
4203         if (IS_ERR(task))
4204                 goto out;
4205         status = nfs4_wait_for_completion_rpc_task(task);
4206         rpc_put_task(task);
4207 out:
4208         request->fl_flags = fl_flags;
4209         return status;
4210 }
4211
4212 struct nfs4_lockdata {
4213         struct nfs_lock_args arg;
4214         struct nfs_lock_res res;
4215         struct nfs4_lock_state *lsp;
4216         struct nfs_open_context *ctx;
4217         struct file_lock fl;
4218         unsigned long timestamp;
4219         int rpc_status;
4220         int cancelled;
4221         struct nfs_server *server;
4222 };
4223
4224 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4225                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4226                 gfp_t gfp_mask)
4227 {
4228         struct nfs4_lockdata *p;
4229         struct inode *inode = lsp->ls_state->inode;
4230         struct nfs_server *server = NFS_SERVER(inode);
4231
4232         p = kzalloc(sizeof(*p), gfp_mask);
4233         if (p == NULL)
4234                 return NULL;
4235
4236         p->arg.fh = NFS_FH(inode);
4237         p->arg.fl = &p->fl;
4238         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4239         if (p->arg.open_seqid == NULL)
4240                 goto out_free;
4241         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4242         if (p->arg.lock_seqid == NULL)
4243                 goto out_free_seqid;
4244         p->arg.lock_stateid = &lsp->ls_stateid;
4245         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4246         p->arg.lock_owner.id = lsp->ls_id.id;
4247         p->arg.lock_owner.s_dev = server->s_dev;
4248         p->res.lock_seqid = p->arg.lock_seqid;
4249         p->lsp = lsp;
4250         p->server = server;
4251         atomic_inc(&lsp->ls_count);
4252         p->ctx = get_nfs_open_context(ctx);
4253         memcpy(&p->fl, fl, sizeof(p->fl));
4254         return p;
4255 out_free_seqid:
4256         nfs_free_seqid(p->arg.open_seqid);
4257 out_free:
4258         kfree(p);
4259         return NULL;
4260 }
4261
4262 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4263 {
4264         struct nfs4_lockdata *data = calldata;
4265         struct nfs4_state *state = data->lsp->ls_state;
4266
4267         dprintk("%s: begin!\n", __func__);
4268         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4269                 return;
4270         /* Do we need to do an open_to_lock_owner? */
4271         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4272                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4273                         return;
4274                 data->arg.open_stateid = &state->stateid;
4275                 data->arg.new_lock_owner = 1;
4276                 data->res.open_seqid = data->arg.open_seqid;
4277         } else
4278                 data->arg.new_lock_owner = 0;
4279         data->timestamp = jiffies;
4280         if (nfs4_setup_sequence(data->server,
4281                                 &data->arg.seq_args,
4282                                 &data->res.seq_res, 1, task))
4283                 return;
4284         rpc_call_start(task);
4285         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4286 }
4287
4288 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4289 {
4290         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4291         nfs4_lock_prepare(task, calldata);
4292 }
4293
4294 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4295 {
4296         struct nfs4_lockdata *data = calldata;
4297
4298         dprintk("%s: begin!\n", __func__);
4299
4300         if (!nfs4_sequence_done(task, &data->res.seq_res))
4301                 return;
4302
4303         data->rpc_status = task->tk_status;
4304         if (data->arg.new_lock_owner != 0) {
4305                 if (data->rpc_status == 0)
4306                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4307                 else
4308                         goto out;
4309         }
4310         if (data->rpc_status == 0) {
4311                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
4312                                         sizeof(data->lsp->ls_stateid.data));
4313                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4314                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4315         }
4316 out:
4317         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4318 }
4319
4320 static void nfs4_lock_release(void *calldata)
4321 {
4322         struct nfs4_lockdata *data = calldata;
4323
4324         dprintk("%s: begin!\n", __func__);
4325         nfs_free_seqid(data->arg.open_seqid);
4326         if (data->cancelled != 0) {
4327                 struct rpc_task *task;
4328                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4329                                 data->arg.lock_seqid);
4330                 if (!IS_ERR(task))
4331                         rpc_put_task_async(task);
4332                 dprintk("%s: cancelling lock!\n", __func__);
4333         } else
4334                 nfs_free_seqid(data->arg.lock_seqid);
4335         nfs4_put_lock_state(data->lsp);
4336         put_nfs_open_context(data->ctx);
4337         kfree(data);
4338         dprintk("%s: done!\n", __func__);
4339 }
4340
4341 static const struct rpc_call_ops nfs4_lock_ops = {
4342         .rpc_call_prepare = nfs4_lock_prepare,
4343         .rpc_call_done = nfs4_lock_done,
4344         .rpc_release = nfs4_lock_release,
4345 };
4346
4347 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4348         .rpc_call_prepare = nfs4_recover_lock_prepare,
4349         .rpc_call_done = nfs4_lock_done,
4350         .rpc_release = nfs4_lock_release,
4351 };
4352
4353 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4354 {
4355         switch (error) {
4356         case -NFS4ERR_ADMIN_REVOKED:
4357         case -NFS4ERR_BAD_STATEID:
4358                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4359                 if (new_lock_owner != 0 ||
4360                    (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4361                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4362                 break;
4363         case -NFS4ERR_STALE_STATEID:
4364                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4365         case -NFS4ERR_EXPIRED:
4366                 nfs4_schedule_lease_recovery(server->nfs_client);
4367         };
4368 }
4369
4370 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4371 {
4372         struct nfs4_lockdata *data;
4373         struct rpc_task *task;
4374         struct rpc_message msg = {
4375                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4376                 .rpc_cred = state->owner->so_cred,
4377         };
4378         struct rpc_task_setup task_setup_data = {
4379                 .rpc_client = NFS_CLIENT(state->inode),
4380                 .rpc_message = &msg,
4381                 .callback_ops = &nfs4_lock_ops,
4382                 .workqueue = nfsiod_workqueue,
4383                 .flags = RPC_TASK_ASYNC,
4384         };
4385         int ret;
4386
4387         dprintk("%s: begin!\n", __func__);
4388         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4389                         fl->fl_u.nfs4_fl.owner,
4390                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4391         if (data == NULL)
4392                 return -ENOMEM;
4393         if (IS_SETLKW(cmd))
4394                 data->arg.block = 1;
4395         if (recovery_type > NFS_LOCK_NEW) {
4396                 if (recovery_type == NFS_LOCK_RECLAIM)
4397                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4398                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4399         }
4400         msg.rpc_argp = &data->arg;
4401         msg.rpc_resp = &data->res;
4402         task_setup_data.callback_data = data;
4403         task = rpc_run_task(&task_setup_data);
4404         if (IS_ERR(task))
4405                 return PTR_ERR(task);
4406         ret = nfs4_wait_for_completion_rpc_task(task);
4407         if (ret == 0) {
4408                 ret = data->rpc_status;
4409                 if (ret)
4410                         nfs4_handle_setlk_error(data->server, data->lsp,
4411                                         data->arg.new_lock_owner, ret);
4412         } else
4413                 data->cancelled = 1;
4414         rpc_put_task(task);
4415         dprintk("%s: done, ret = %d!\n", __func__, ret);
4416         return ret;
4417 }
4418
4419 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4420 {
4421         struct nfs_server *server = NFS_SERVER(state->inode);
4422         struct nfs4_exception exception = { };
4423         int err;
4424
4425         do {
4426                 /* Cache the lock if possible... */
4427                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4428                         return 0;
4429                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4430                 if (err != -NFS4ERR_DELAY)
4431                         break;
4432                 nfs4_handle_exception(server, err, &exception);
4433         } while (exception.retry);
4434         return err;
4435 }
4436
4437 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4438 {
4439         struct nfs_server *server = NFS_SERVER(state->inode);
4440         struct nfs4_exception exception = { };
4441         int err;
4442
4443         err = nfs4_set_lock_state(state, request);
4444         if (err != 0)
4445                 return err;
4446         do {
4447                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4448                         return 0;
4449                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4450                 switch (err) {
4451                 default:
4452                         goto out;
4453                 case -NFS4ERR_GRACE:
4454                 case -NFS4ERR_DELAY:
4455                         nfs4_handle_exception(server, err, &exception);
4456                         err = 0;
4457                 }
4458         } while (exception.retry);
4459 out:
4460         return err;
4461 }
4462
4463 #if defined(CONFIG_NFS_V4_1)
4464 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
4465 {
4466         int status;
4467         struct nfs_server *server = NFS_SERVER(state->inode);
4468
4469         status = nfs41_test_stateid(server, state);
4470         if (status == NFS_OK)
4471                 return 0;
4472         nfs41_free_stateid(server, state);
4473         return nfs4_lock_expired(state, request);
4474 }
4475 #endif
4476
4477 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4478 {
4479         struct nfs_inode *nfsi = NFS_I(state->inode);
4480         unsigned char fl_flags = request->fl_flags;
4481         int status = -ENOLCK;
4482
4483         if ((fl_flags & FL_POSIX) &&
4484                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4485                 goto out;
4486         /* Is this a delegated open? */
4487         status = nfs4_set_lock_state(state, request);
4488         if (status != 0)
4489                 goto out;
4490         request->fl_flags |= FL_ACCESS;
4491         status = do_vfs_lock(request->fl_file, request);
4492         if (status < 0)
4493                 goto out;
4494         down_read(&nfsi->rwsem);
4495         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4496                 /* Yes: cache locks! */
4497                 /* ...but avoid races with delegation recall... */
4498                 request->fl_flags = fl_flags & ~FL_SLEEP;
4499                 status = do_vfs_lock(request->fl_file, request);
4500                 goto out_unlock;
4501         }
4502         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4503         if (status != 0)
4504                 goto out_unlock;
4505         /* Note: we always want to sleep here! */
4506         request->fl_flags = fl_flags | FL_SLEEP;
4507         if (do_vfs_lock(request->fl_file, request) < 0)
4508                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4509 out_unlock:
4510         up_read(&nfsi->rwsem);
4511 out:
4512         request->fl_flags = fl_flags;
4513         return status;
4514 }
4515
4516 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4517 {
4518         struct nfs4_exception exception = { };
4519         int err;
4520
4521         do {
4522                 err = _nfs4_proc_setlk(state, cmd, request);
4523                 if (err == -NFS4ERR_DENIED)
4524                         err = -EAGAIN;
4525                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4526                                 err, &exception);
4527         } while (exception.retry);
4528         return err;
4529 }
4530
4531 static int
4532 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4533 {
4534         struct nfs_open_context *ctx;
4535         struct nfs4_state *state;
4536         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4537         int status;
4538
4539         /* verify open state */
4540         ctx = nfs_file_open_context(filp);
4541         state = ctx->state;
4542
4543         if (request->fl_start < 0 || request->fl_end < 0)
4544                 return -EINVAL;
4545
4546         if (IS_GETLK(cmd)) {
4547                 if (state != NULL)
4548                         return nfs4_proc_getlk(state, F_GETLK, request);
4549                 return 0;
4550         }
4551
4552         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4553                 return -EINVAL;
4554
4555         if (request->fl_type == F_UNLCK) {
4556                 if (state != NULL)
4557                         return nfs4_proc_unlck(state, cmd, request);
4558                 return 0;
4559         }
4560
4561         if (state == NULL)
4562                 return -ENOLCK;
4563         do {
4564                 status = nfs4_proc_setlk(state, cmd, request);
4565                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4566                         break;
4567                 timeout = nfs4_set_lock_task_retry(timeout);
4568                 status = -ERESTARTSYS;
4569                 if (signalled())
4570                         break;
4571         } while(status < 0);
4572         return status;
4573 }
4574
4575 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4576 {
4577         struct nfs_server *server = NFS_SERVER(state->inode);
4578         struct nfs4_exception exception = { };
4579         int err;
4580
4581         err = nfs4_set_lock_state(state, fl);
4582         if (err != 0)
4583                 goto out;
4584         do {
4585                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4586                 switch (err) {
4587                         default:
4588                                 printk(KERN_ERR "%s: unhandled error %d.\n",
4589                                                 __func__, err);
4590                         case 0:
4591                         case -ESTALE:
4592                                 goto out;
4593                         case -NFS4ERR_EXPIRED:
4594                                 nfs4_schedule_stateid_recovery(server, state);
4595                         case -NFS4ERR_STALE_CLIENTID:
4596                         case -NFS4ERR_STALE_STATEID:
4597                                 nfs4_schedule_lease_recovery(server->nfs_client);
4598                                 goto out;
4599                         case -NFS4ERR_BADSESSION:
4600                         case -NFS4ERR_BADSLOT:
4601                         case -NFS4ERR_BAD_HIGH_SLOT:
4602                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4603                         case -NFS4ERR_DEADSESSION:
4604                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
4605                                 goto out;
4606                         case -ERESTARTSYS:
4607                                 /*
4608                                  * The show must go on: exit, but mark the
4609                                  * stateid as needing recovery.
4610                                  */
4611                         case -NFS4ERR_ADMIN_REVOKED:
4612                         case -NFS4ERR_BAD_STATEID:
4613                         case -NFS4ERR_OPENMODE:
4614                                 nfs4_schedule_stateid_recovery(server, state);
4615                                 err = 0;
4616                                 goto out;
4617                         case -EKEYEXPIRED:
4618                                 /*
4619                                  * User RPCSEC_GSS context has expired.
4620                                  * We cannot recover this stateid now, so
4621                                  * skip it and allow recovery thread to
4622                                  * proceed.
4623                                  */
4624                                 err = 0;
4625                                 goto out;
4626                         case -ENOMEM:
4627                         case -NFS4ERR_DENIED:
4628                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4629                                 err = 0;
4630                                 goto out;
4631                         case -NFS4ERR_DELAY:
4632                                 break;
4633                 }
4634                 err = nfs4_handle_exception(server, err, &exception);
4635         } while (exception.retry);
4636 out:
4637         return err;
4638 }
4639
4640 static void nfs4_release_lockowner_release(void *calldata)
4641 {
4642         kfree(calldata);
4643 }
4644
4645 const struct rpc_call_ops nfs4_release_lockowner_ops = {
4646         .rpc_release = nfs4_release_lockowner_release,
4647 };
4648
4649 void nfs4_release_lockowner(const struct nfs4_lock_state *lsp)
4650 {
4651         struct nfs_server *server = lsp->ls_state->owner->so_server;
4652         struct nfs_release_lockowner_args *args;
4653         struct rpc_message msg = {
4654                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4655         };
4656
4657         if (server->nfs_client->cl_mvops->minor_version != 0)
4658                 return;
4659         args = kmalloc(sizeof(*args), GFP_NOFS);
4660         if (!args)
4661                 return;
4662         args->lock_owner.clientid = server->nfs_client->cl_clientid;
4663         args->lock_owner.id = lsp->ls_id.id;
4664         args->lock_owner.s_dev = server->s_dev;
4665         msg.rpc_argp = args;
4666         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, args);
4667 }
4668
4669 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4670
4671 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
4672                                    const void *buf, size_t buflen,
4673                                    int flags, int type)
4674 {
4675         if (strcmp(key, "") != 0)
4676                 return -EINVAL;
4677
4678         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
4679 }
4680
4681 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
4682                                    void *buf, size_t buflen, int type)
4683 {
4684         if (strcmp(key, "") != 0)
4685                 return -EINVAL;
4686
4687         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
4688 }
4689
4690 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
4691                                        size_t list_len, const char *name,
4692                                        size_t name_len, int type)
4693 {
4694         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
4695
4696         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4697                 return 0;
4698
4699         if (list && len <= list_len)
4700                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
4701         return len;
4702 }
4703
4704 /*
4705  * nfs_fhget will use either the mounted_on_fileid or the fileid
4706  */
4707 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4708 {
4709         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
4710                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
4711               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4712               (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4713                 return;
4714
4715         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4716                 NFS_ATTR_FATTR_NLINK;
4717         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4718         fattr->nlink = 2;
4719 }
4720
4721 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4722                 struct nfs4_fs_locations *fs_locations, struct page *page)
4723 {
4724         struct nfs_server *server = NFS_SERVER(dir);
4725         u32 bitmask[2] = {
4726                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4727         };
4728         struct nfs4_fs_locations_arg args = {
4729                 .dir_fh = NFS_FH(dir),
4730                 .name = name,
4731                 .page = page,
4732                 .bitmask = bitmask,
4733         };
4734         struct nfs4_fs_locations_res res = {
4735                 .fs_locations = fs_locations,
4736         };
4737         struct rpc_message msg = {
4738                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4739                 .rpc_argp = &args,
4740                 .rpc_resp = &res,
4741         };
4742         int status;
4743
4744         dprintk("%s: start\n", __func__);
4745
4746         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
4747          * is not supported */
4748         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
4749                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
4750         else
4751                 bitmask[0] |= FATTR4_WORD0_FILEID;
4752
4753         nfs_fattr_init(&fs_locations->fattr);
4754         fs_locations->server = server;
4755         fs_locations->nlocations = 0;
4756         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4757         dprintk("%s: returned status = %d\n", __func__, status);
4758         return status;
4759 }
4760
4761 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
4762 {
4763         int status;
4764         struct nfs4_secinfo_arg args = {
4765                 .dir_fh = NFS_FH(dir),
4766                 .name   = name,
4767         };
4768         struct nfs4_secinfo_res res = {
4769                 .flavors     = flavors,
4770         };
4771         struct rpc_message msg = {
4772                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
4773                 .rpc_argp = &args,
4774                 .rpc_resp = &res,
4775         };
4776
4777         dprintk("NFS call  secinfo %s\n", name->name);
4778         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
4779         dprintk("NFS reply  secinfo: %d\n", status);
4780         return status;
4781 }
4782
4783 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
4784 {
4785         struct nfs4_exception exception = { };
4786         int err;
4787         do {
4788                 err = nfs4_handle_exception(NFS_SERVER(dir),
4789                                 _nfs4_proc_secinfo(dir, name, flavors),
4790                                 &exception);
4791         } while (exception.retry);
4792         return err;
4793 }
4794
4795 #ifdef CONFIG_NFS_V4_1
4796 /*
4797  * Check the exchange flags returned by the server for invalid flags, having
4798  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
4799  * DS flags set.
4800  */
4801 static int nfs4_check_cl_exchange_flags(u32 flags)
4802 {
4803         if (flags & ~EXCHGID4_FLAG_MASK_R)
4804                 goto out_inval;
4805         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
4806             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
4807                 goto out_inval;
4808         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
4809                 goto out_inval;
4810         return NFS_OK;
4811 out_inval:
4812         return -NFS4ERR_INVAL;
4813 }
4814
4815 static bool
4816 nfs41_same_server_scope(struct server_scope *a, struct server_scope *b)
4817 {
4818         if (a->server_scope_sz == b->server_scope_sz &&
4819             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
4820                 return true;
4821
4822         return false;
4823 }
4824
4825 /*
4826  * nfs4_proc_exchange_id()
4827  *
4828  * Since the clientid has expired, all compounds using sessions
4829  * associated with the stale clientid will be returning
4830  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4831  * be in some phase of session reset.
4832  */
4833 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4834 {
4835         nfs4_verifier verifier;
4836         struct nfs41_exchange_id_args args = {
4837                 .client = clp,
4838                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
4839         };
4840         struct nfs41_exchange_id_res res = {
4841                 .client = clp,
4842         };
4843         int status;
4844         struct rpc_message msg = {
4845                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4846                 .rpc_argp = &args,
4847                 .rpc_resp = &res,
4848                 .rpc_cred = cred,
4849         };
4850         __be32 *p;
4851
4852         dprintk("--> %s\n", __func__);
4853         BUG_ON(clp == NULL);
4854
4855         p = (u32 *)verifier.data;
4856         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4857         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
4858         args.verifier = &verifier;
4859
4860         args.id_len = scnprintf(args.id, sizeof(args.id),
4861                                 "%s/%s.%s/%u",
4862                                 clp->cl_ipaddr,
4863                                 init_utsname()->nodename,
4864                                 init_utsname()->domainname,
4865                                 clp->cl_rpcclient->cl_auth->au_flavor);
4866
4867         res.server_scope = kzalloc(sizeof(struct server_scope), GFP_KERNEL);
4868         if (unlikely(!res.server_scope))
4869                 return -ENOMEM;
4870
4871         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4872         if (!status)
4873                 status = nfs4_check_cl_exchange_flags(clp->cl_exchange_flags);
4874
4875         if (!status) {
4876                 if (clp->server_scope &&
4877                     !nfs41_same_server_scope(clp->server_scope,
4878                                              res.server_scope)) {
4879                         dprintk("%s: server_scope mismatch detected\n",
4880                                 __func__);
4881                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
4882                         kfree(clp->server_scope);
4883                         clp->server_scope = NULL;
4884                 }
4885
4886                 if (!clp->server_scope)
4887                         clp->server_scope = res.server_scope;
4888                 else
4889                         kfree(res.server_scope);
4890         }
4891
4892         dprintk("<-- %s status= %d\n", __func__, status);
4893         return status;
4894 }
4895
4896 struct nfs4_get_lease_time_data {
4897         struct nfs4_get_lease_time_args *args;
4898         struct nfs4_get_lease_time_res *res;
4899         struct nfs_client *clp;
4900 };
4901
4902 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
4903                                         void *calldata)
4904 {
4905         int ret;
4906         struct nfs4_get_lease_time_data *data =
4907                         (struct nfs4_get_lease_time_data *)calldata;
4908
4909         dprintk("--> %s\n", __func__);
4910         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4911         /* just setup sequence, do not trigger session recovery
4912            since we're invoked within one */
4913         ret = nfs41_setup_sequence(data->clp->cl_session,
4914                                    &data->args->la_seq_args,
4915                                    &data->res->lr_seq_res, 0, task);
4916
4917         BUG_ON(ret == -EAGAIN);
4918         rpc_call_start(task);
4919         dprintk("<-- %s\n", __func__);
4920 }
4921
4922 /*
4923  * Called from nfs4_state_manager thread for session setup, so don't recover
4924  * from sequence operation or clientid errors.
4925  */
4926 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
4927 {
4928         struct nfs4_get_lease_time_data *data =
4929                         (struct nfs4_get_lease_time_data *)calldata;
4930
4931         dprintk("--> %s\n", __func__);
4932         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
4933                 return;
4934         switch (task->tk_status) {
4935         case -NFS4ERR_DELAY:
4936         case -NFS4ERR_GRACE:
4937                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
4938                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
4939                 task->tk_status = 0;
4940                 /* fall through */
4941         case -NFS4ERR_RETRY_UNCACHED_REP:
4942                 nfs_restart_rpc(task, data->clp);
4943                 return;
4944         }
4945         dprintk("<-- %s\n", __func__);
4946 }
4947
4948 struct rpc_call_ops nfs4_get_lease_time_ops = {
4949         .rpc_call_prepare = nfs4_get_lease_time_prepare,
4950         .rpc_call_done = nfs4_get_lease_time_done,
4951 };
4952
4953 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
4954 {
4955         struct rpc_task *task;
4956         struct nfs4_get_lease_time_args args;
4957         struct nfs4_get_lease_time_res res = {
4958                 .lr_fsinfo = fsinfo,
4959         };
4960         struct nfs4_get_lease_time_data data = {
4961                 .args = &args,
4962                 .res = &res,
4963                 .clp = clp,
4964         };
4965         struct rpc_message msg = {
4966                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
4967                 .rpc_argp = &args,
4968                 .rpc_resp = &res,
4969         };
4970         struct rpc_task_setup task_setup = {
4971                 .rpc_client = clp->cl_rpcclient,
4972                 .rpc_message = &msg,
4973                 .callback_ops = &nfs4_get_lease_time_ops,
4974                 .callback_data = &data,
4975                 .flags = RPC_TASK_TIMEOUT,
4976         };
4977         int status;
4978
4979         dprintk("--> %s\n", __func__);
4980         task = rpc_run_task(&task_setup);
4981
4982         if (IS_ERR(task))
4983                 status = PTR_ERR(task);
4984         else {
4985                 status = task->tk_status;
4986                 rpc_put_task(task);
4987         }
4988         dprintk("<-- %s return %d\n", __func__, status);
4989
4990         return status;
4991 }
4992
4993 /*
4994  * Reset a slot table
4995  */
4996 static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
4997                                  int ivalue)
4998 {
4999         struct nfs4_slot *new = NULL;
5000         int i;
5001         int ret = 0;
5002
5003         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
5004                 max_reqs, tbl->max_slots);
5005
5006         /* Does the newly negotiated max_reqs match the existing slot table? */
5007         if (max_reqs != tbl->max_slots) {
5008                 ret = -ENOMEM;
5009                 new = kmalloc(max_reqs * sizeof(struct nfs4_slot),
5010                               GFP_NOFS);
5011                 if (!new)
5012                         goto out;
5013                 ret = 0;
5014                 kfree(tbl->slots);
5015         }
5016         spin_lock(&tbl->slot_tbl_lock);
5017         if (new) {
5018                 tbl->slots = new;
5019                 tbl->max_slots = max_reqs;
5020         }
5021         for (i = 0; i < tbl->max_slots; ++i)
5022                 tbl->slots[i].seq_nr = ivalue;
5023         spin_unlock(&tbl->slot_tbl_lock);
5024         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5025                 tbl, tbl->slots, tbl->max_slots);
5026 out:
5027         dprintk("<-- %s: return %d\n", __func__, ret);
5028         return ret;
5029 }
5030
5031 /*
5032  * Reset the forechannel and backchannel slot tables
5033  */
5034 static int nfs4_reset_slot_tables(struct nfs4_session *session)
5035 {
5036         int status;
5037
5038         status = nfs4_reset_slot_table(&session->fc_slot_table,
5039                         session->fc_attrs.max_reqs, 1);
5040         if (status)
5041                 return status;
5042
5043         status = nfs4_reset_slot_table(&session->bc_slot_table,
5044                         session->bc_attrs.max_reqs, 0);
5045         return status;
5046 }
5047
5048 /* Destroy the slot table */
5049 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
5050 {
5051         if (session->fc_slot_table.slots != NULL) {
5052                 kfree(session->fc_slot_table.slots);
5053                 session->fc_slot_table.slots = NULL;
5054         }
5055         if (session->bc_slot_table.slots != NULL) {
5056                 kfree(session->bc_slot_table.slots);
5057                 session->bc_slot_table.slots = NULL;
5058         }
5059         return;
5060 }
5061
5062 /*
5063  * Initialize slot table
5064  */
5065 static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
5066                 int max_slots, int ivalue)
5067 {
5068         struct nfs4_slot *slot;
5069         int ret = -ENOMEM;
5070
5071         BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);
5072
5073         dprintk("--> %s: max_reqs=%u\n", __func__, max_slots);
5074
5075         slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_NOFS);
5076         if (!slot)
5077                 goto out;
5078         ret = 0;
5079
5080         spin_lock(&tbl->slot_tbl_lock);
5081         tbl->max_slots = max_slots;
5082         tbl->slots = slot;
5083         tbl->highest_used_slotid = -1;  /* no slot is currently used */
5084         spin_unlock(&tbl->slot_tbl_lock);
5085         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5086                 tbl, tbl->slots, tbl->max_slots);
5087 out:
5088         dprintk("<-- %s: return %d\n", __func__, ret);
5089         return ret;
5090 }
5091
5092 /*
5093  * Initialize the forechannel and backchannel tables
5094  */
5095 static int nfs4_init_slot_tables(struct nfs4_session *session)
5096 {
5097         struct nfs4_slot_table *tbl;
5098         int status = 0;
5099
5100         tbl = &session->fc_slot_table;
5101         if (tbl->slots == NULL) {
5102                 status = nfs4_init_slot_table(tbl,
5103                                 session->fc_attrs.max_reqs, 1);
5104                 if (status)
5105                         return status;
5106         }
5107
5108         tbl = &session->bc_slot_table;
5109         if (tbl->slots == NULL) {
5110                 status = nfs4_init_slot_table(tbl,
5111                                 session->bc_attrs.max_reqs, 0);
5112                 if (status)
5113                         nfs4_destroy_slot_tables(session);
5114         }
5115
5116         return status;
5117 }
5118
5119 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
5120 {
5121         struct nfs4_session *session;
5122         struct nfs4_slot_table *tbl;
5123
5124         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5125         if (!session)
5126                 return NULL;
5127
5128         tbl = &session->fc_slot_table;
5129         tbl->highest_used_slotid = -1;
5130         spin_lock_init(&tbl->slot_tbl_lock);
5131         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
5132         init_completion(&tbl->complete);
5133
5134         tbl = &session->bc_slot_table;
5135         tbl->highest_used_slotid = -1;
5136         spin_lock_init(&tbl->slot_tbl_lock);
5137         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
5138         init_completion(&tbl->complete);
5139
5140         session->session_state = 1<<NFS4_SESSION_INITING;
5141
5142         session->clp = clp;
5143         return session;
5144 }
5145
5146 void nfs4_destroy_session(struct nfs4_session *session)
5147 {
5148         nfs4_proc_destroy_session(session);
5149         dprintk("%s Destroy backchannel for xprt %p\n",
5150                 __func__, session->clp->cl_rpcclient->cl_xprt);
5151         xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
5152                                 NFS41_BC_MIN_CALLBACKS);
5153         nfs4_destroy_slot_tables(session);
5154         kfree(session);
5155 }
5156
5157 /*
5158  * Initialize the values to be used by the client in CREATE_SESSION
5159  * If nfs4_init_session set the fore channel request and response sizes,
5160  * use them.
5161  *
5162  * Set the back channel max_resp_sz_cached to zero to force the client to
5163  * always set csa_cachethis to FALSE because the current implementation
5164  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5165  */
5166 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5167 {
5168         struct nfs4_session *session = args->client->cl_session;
5169         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
5170                      mxresp_sz = session->fc_attrs.max_resp_sz;
5171
5172         if (mxrqst_sz == 0)
5173                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5174         if (mxresp_sz == 0)
5175                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5176         /* Fore channel attributes */
5177         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5178         args->fc_attrs.max_resp_sz = mxresp_sz;
5179         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5180         args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;
5181
5182         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5183                 "max_ops=%u max_reqs=%u\n",
5184                 __func__,
5185                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5186                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5187
5188         /* Back channel attributes */
5189         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5190         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5191         args->bc_attrs.max_resp_sz_cached = 0;
5192         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5193         args->bc_attrs.max_reqs = 1;
5194
5195         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5196                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5197                 __func__,
5198                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5199                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5200                 args->bc_attrs.max_reqs);
5201 }
5202
5203 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5204 {
5205         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5206         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5207
5208         if (rcvd->max_resp_sz > sent->max_resp_sz)
5209                 return -EINVAL;
5210         /*
5211          * Our requested max_ops is the minimum we need; we're not
5212          * prepared to break up compounds into smaller pieces than that.
5213          * So, no point even trying to continue if the server won't
5214          * cooperate:
5215          */
5216         if (rcvd->max_ops < sent->max_ops)
5217                 return -EINVAL;
5218         if (rcvd->max_reqs == 0)
5219                 return -EINVAL;
5220         return 0;
5221 }
5222
5223 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5224 {
5225         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5226         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5227
5228         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5229                 return -EINVAL;
5230         if (rcvd->max_resp_sz < sent->max_resp_sz)
5231                 return -EINVAL;
5232         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5233                 return -EINVAL;
5234         /* These would render the backchannel useless: */
5235         if (rcvd->max_ops  == 0)
5236                 return -EINVAL;
5237         if (rcvd->max_reqs == 0)
5238                 return -EINVAL;
5239         return 0;
5240 }
5241
5242 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5243                                      struct nfs4_session *session)
5244 {
5245         int ret;
5246
5247         ret = nfs4_verify_fore_channel_attrs(args, session);
5248         if (ret)
5249                 return ret;
5250         return nfs4_verify_back_channel_attrs(args, session);
5251 }
5252
5253 static int _nfs4_proc_create_session(struct nfs_client *clp)
5254 {
5255         struct nfs4_session *session = clp->cl_session;
5256         struct nfs41_create_session_args args = {
5257                 .client = clp,
5258                 .cb_program = NFS4_CALLBACK,
5259         };
5260         struct nfs41_create_session_res res = {
5261                 .client = clp,
5262         };
5263         struct rpc_message msg = {
5264                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5265                 .rpc_argp = &args,
5266                 .rpc_resp = &res,
5267         };
5268         int status;
5269
5270         nfs4_init_channel_attrs(&args);
5271         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5272
5273         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5274
5275         if (!status)
5276                 /* Verify the session's negotiated channel_attrs values */
5277                 status = nfs4_verify_channel_attrs(&args, session);
5278         if (!status) {
5279                 /* Increment the clientid slot sequence id */
5280                 clp->cl_seqid++;
5281         }
5282
5283         return status;
5284 }
5285
5286 /*
5287  * Issues a CREATE_SESSION operation to the server.
5288  * It is the responsibility of the caller to verify the session is
5289  * expired before calling this routine.
5290  */
5291 int nfs4_proc_create_session(struct nfs_client *clp)
5292 {
5293         int status;
5294         unsigned *ptr;
5295         struct nfs4_session *session = clp->cl_session;
5296
5297         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5298
5299         status = _nfs4_proc_create_session(clp);
5300         if (status)
5301                 goto out;
5302
5303         /* Init and reset the fore channel */
5304         status = nfs4_init_slot_tables(session);
5305         dprintk("slot table initialization returned %d\n", status);
5306         if (status)
5307                 goto out;
5308         status = nfs4_reset_slot_tables(session);
5309         dprintk("slot table reset returned %d\n", status);
5310         if (status)
5311                 goto out;
5312
5313         ptr = (unsigned *)&session->sess_id.data[0];
5314         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5315                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5316 out:
5317         dprintk("<-- %s\n", __func__);
5318         return status;
5319 }
5320
5321 /*
5322  * Issue the over-the-wire RPC DESTROY_SESSION.
5323  * The caller must serialize access to this routine.
5324  */
5325 int nfs4_proc_destroy_session(struct nfs4_session *session)
5326 {
5327         int status = 0;
5328         struct rpc_message msg;
5329
5330         dprintk("--> nfs4_proc_destroy_session\n");
5331
5332         /* session is still being setup */
5333         if (session->clp->cl_cons_state != NFS_CS_READY)
5334                 return status;
5335
5336         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
5337         msg.rpc_argp = session;
5338         msg.rpc_resp = NULL;
5339         msg.rpc_cred = NULL;
5340         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5341
5342         if (status)
5343                 printk(KERN_WARNING
5344                         "Got error %d from the server on DESTROY_SESSION. "
5345                         "Session has been destroyed regardless...\n", status);
5346
5347         dprintk("<-- nfs4_proc_destroy_session\n");
5348         return status;
5349 }
5350
5351 int nfs4_init_session(struct nfs_server *server)
5352 {
5353         struct nfs_client *clp = server->nfs_client;
5354         struct nfs4_session *session;
5355         unsigned int rsize, wsize;
5356         int ret;
5357
5358         if (!nfs4_has_session(clp))
5359                 return 0;
5360
5361         session = clp->cl_session;
5362         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5363                 return 0;
5364
5365         rsize = server->rsize;
5366         if (rsize == 0)
5367                 rsize = NFS_MAX_FILE_IO_SIZE;
5368         wsize = server->wsize;
5369         if (wsize == 0)
5370                 wsize = NFS_MAX_FILE_IO_SIZE;
5371
5372         session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5373         session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5374
5375         ret = nfs4_recover_expired_lease(server);
5376         if (!ret)
5377                 ret = nfs4_check_client_ready(clp);
5378         return ret;
5379 }
5380
5381 int nfs4_init_ds_session(struct nfs_client *clp)
5382 {
5383         struct nfs4_session *session = clp->cl_session;
5384         int ret;
5385
5386         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5387                 return 0;
5388
5389         ret = nfs4_client_recover_expired_lease(clp);
5390         if (!ret)
5391                 /* Test for the DS role */
5392                 if (!is_ds_client(clp))
5393                         ret = -ENODEV;
5394         if (!ret)
5395                 ret = nfs4_check_client_ready(clp);
5396         return ret;
5397
5398 }
5399 EXPORT_SYMBOL_GPL(nfs4_init_ds_session);
5400
5401
5402 /*
5403  * Renew the cl_session lease.
5404  */
5405 struct nfs4_sequence_data {
5406         struct nfs_client *clp;
5407         struct nfs4_sequence_args args;
5408         struct nfs4_sequence_res res;
5409 };
5410
5411 static void nfs41_sequence_release(void *data)
5412 {
5413         struct nfs4_sequence_data *calldata = data;
5414         struct nfs_client *clp = calldata->clp;
5415
5416         if (atomic_read(&clp->cl_count) > 1)
5417                 nfs4_schedule_state_renewal(clp);
5418         nfs_put_client(clp);
5419         kfree(calldata);
5420 }
5421
5422 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5423 {
5424         switch(task->tk_status) {
5425         case -NFS4ERR_DELAY:
5426                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5427                 return -EAGAIN;
5428         default:
5429                 nfs4_schedule_lease_recovery(clp);
5430         }
5431         return 0;
5432 }
5433
5434 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5435 {
5436         struct nfs4_sequence_data *calldata = data;
5437         struct nfs_client *clp = calldata->clp;
5438
5439         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5440                 return;
5441
5442         if (task->tk_status < 0) {
5443                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5444                 if (atomic_read(&clp->cl_count) == 1)
5445                         goto out;
5446
5447                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5448                         rpc_restart_call_prepare(task);
5449                         return;
5450                 }
5451         }
5452         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5453 out:
5454         dprintk("<-- %s\n", __func__);
5455 }
5456
5457 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5458 {
5459         struct nfs4_sequence_data *calldata = data;
5460         struct nfs_client *clp = calldata->clp;
5461         struct nfs4_sequence_args *args;
5462         struct nfs4_sequence_res *res;
5463
5464         args = task->tk_msg.rpc_argp;
5465         res = task->tk_msg.rpc_resp;
5466
5467         if (nfs41_setup_sequence(clp->cl_session, args, res, 0, task))
5468                 return;
5469         rpc_call_start(task);
5470 }
5471
5472 static const struct rpc_call_ops nfs41_sequence_ops = {
5473         .rpc_call_done = nfs41_sequence_call_done,
5474         .rpc_call_prepare = nfs41_sequence_prepare,
5475         .rpc_release = nfs41_sequence_release,
5476 };
5477
5478 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5479 {
5480         struct nfs4_sequence_data *calldata;
5481         struct rpc_message msg = {
5482                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5483                 .rpc_cred = cred,
5484         };
5485         struct rpc_task_setup task_setup_data = {
5486                 .rpc_client = clp->cl_rpcclient,
5487                 .rpc_message = &msg,
5488                 .callback_ops = &nfs41_sequence_ops,
5489                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5490         };
5491
5492         if (!atomic_inc_not_zero(&clp->cl_count))
5493                 return ERR_PTR(-EIO);
5494         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5495         if (calldata == NULL) {
5496                 nfs_put_client(clp);
5497                 return ERR_PTR(-ENOMEM);
5498         }
5499         msg.rpc_argp = &calldata->args;
5500         msg.rpc_resp = &calldata->res;
5501         calldata->clp = clp;
5502         task_setup_data.callback_data = calldata;
5503
5504         return rpc_run_task(&task_setup_data);
5505 }
5506
5507 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5508 {
5509         struct rpc_task *task;
5510         int ret = 0;
5511
5512         task = _nfs41_proc_sequence(clp, cred);
5513         if (IS_ERR(task))
5514                 ret = PTR_ERR(task);
5515         else
5516                 rpc_put_task_async(task);
5517         dprintk("<-- %s status=%d\n", __func__, ret);
5518         return ret;
5519 }
5520
5521 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5522 {
5523         struct rpc_task *task;
5524         int ret;
5525
5526         task = _nfs41_proc_sequence(clp, cred);
5527         if (IS_ERR(task)) {
5528                 ret = PTR_ERR(task);
5529                 goto out;
5530         }
5531         ret = rpc_wait_for_completion_task(task);
5532         if (!ret) {
5533                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
5534
5535                 if (task->tk_status == 0)
5536                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
5537                 ret = task->tk_status;
5538         }
5539         rpc_put_task(task);
5540 out:
5541         dprintk("<-- %s status=%d\n", __func__, ret);
5542         return ret;
5543 }
5544
5545 struct nfs4_reclaim_complete_data {
5546         struct nfs_client *clp;
5547         struct nfs41_reclaim_complete_args arg;
5548         struct nfs41_reclaim_complete_res res;
5549 };
5550
5551 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5552 {
5553         struct nfs4_reclaim_complete_data *calldata = data;
5554
5555         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5556         if (nfs41_setup_sequence(calldata->clp->cl_session,
5557                                 &calldata->arg.seq_args,
5558                                 &calldata->res.seq_res, 0, task))
5559                 return;
5560
5561         rpc_call_start(task);
5562 }
5563
5564 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5565 {
5566         switch(task->tk_status) {
5567         case 0:
5568         case -NFS4ERR_COMPLETE_ALREADY:
5569         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5570                 break;
5571         case -NFS4ERR_DELAY:
5572                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5573                 /* fall through */
5574         case -NFS4ERR_RETRY_UNCACHED_REP:
5575                 return -EAGAIN;
5576         default:
5577                 nfs4_schedule_lease_recovery(clp);
5578         }
5579         return 0;
5580 }
5581
5582 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5583 {
5584         struct nfs4_reclaim_complete_data *calldata = data;
5585         struct nfs_client *clp = calldata->clp;
5586         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5587
5588         dprintk("--> %s\n", __func__);
5589         if (!nfs41_sequence_done(task, res))
5590                 return;
5591
5592         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5593                 rpc_restart_call_prepare(task);
5594                 return;
5595         }
5596         dprintk("<-- %s\n", __func__);
5597 }
5598
5599 static void nfs4_free_reclaim_complete_data(void *data)
5600 {
5601         struct nfs4_reclaim_complete_data *calldata = data;
5602
5603         kfree(calldata);
5604 }
5605
5606 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5607         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5608         .rpc_call_done = nfs4_reclaim_complete_done,
5609         .rpc_release = nfs4_free_reclaim_complete_data,
5610 };
5611
5612 /*
5613  * Issue a global reclaim complete.
5614  */
5615 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5616 {
5617         struct nfs4_reclaim_complete_data *calldata;
5618         struct rpc_task *task;
5619         struct rpc_message msg = {
5620                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5621         };
5622         struct rpc_task_setup task_setup_data = {
5623                 .rpc_client = clp->cl_rpcclient,
5624                 .rpc_message = &msg,
5625                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5626                 .flags = RPC_TASK_ASYNC,
5627         };
5628         int status = -ENOMEM;
5629
5630         dprintk("--> %s\n", __func__);
5631         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5632         if (calldata == NULL)
5633                 goto out;
5634         calldata->clp = clp;
5635         calldata->arg.one_fs = 0;
5636
5637         msg.rpc_argp = &calldata->arg;
5638         msg.rpc_resp = &calldata->res;
5639         task_setup_data.callback_data = calldata;
5640         task = rpc_run_task(&task_setup_data);
5641         if (IS_ERR(task)) {
5642                 status = PTR_ERR(task);
5643                 goto out;
5644         }
5645         status = nfs4_wait_for_completion_rpc_task(task);
5646         if (status == 0)
5647                 status = task->tk_status;
5648         rpc_put_task(task);
5649         return 0;
5650 out:
5651         dprintk("<-- %s status=%d\n", __func__, status);
5652         return status;
5653 }
5654
5655 static void
5656 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
5657 {
5658         struct nfs4_layoutget *lgp = calldata;
5659         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5660
5661         dprintk("--> %s\n", __func__);
5662         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
5663          * right now covering the LAYOUTGET we are about to send.
5664          * However, that is not so catastrophic, and there seems
5665          * to be no way to prevent it completely.
5666          */
5667         if (nfs4_setup_sequence(server, &lgp->args.seq_args,
5668                                 &lgp->res.seq_res, 0, task))
5669                 return;
5670         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
5671                                           NFS_I(lgp->args.inode)->layout,
5672                                           lgp->args.ctx->state)) {
5673                 rpc_exit(task, NFS4_OK);
5674                 return;
5675         }
5676         rpc_call_start(task);
5677 }
5678
5679 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
5680 {
5681         struct nfs4_layoutget *lgp = calldata;
5682         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5683
5684         dprintk("--> %s\n", __func__);
5685
5686         if (!nfs4_sequence_done(task, &lgp->res.seq_res))
5687                 return;
5688
5689         switch (task->tk_status) {
5690         case 0:
5691                 break;
5692         case -NFS4ERR_LAYOUTTRYLATER:
5693         case -NFS4ERR_RECALLCONFLICT:
5694                 task->tk_status = -NFS4ERR_DELAY;
5695                 /* Fall through */
5696         default:
5697                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5698                         rpc_restart_call_prepare(task);
5699                         return;
5700                 }
5701         }
5702         dprintk("<-- %s\n", __func__);
5703 }
5704
5705 static void nfs4_layoutget_release(void *calldata)
5706 {
5707         struct nfs4_layoutget *lgp = calldata;
5708
5709         dprintk("--> %s\n", __func__);
5710         put_nfs_open_context(lgp->args.ctx);
5711         kfree(calldata);
5712         dprintk("<-- %s\n", __func__);
5713 }
5714
5715 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
5716         .rpc_call_prepare = nfs4_layoutget_prepare,
5717         .rpc_call_done = nfs4_layoutget_done,
5718         .rpc_release = nfs4_layoutget_release,
5719 };
5720
5721 int nfs4_proc_layoutget(struct nfs4_layoutget *lgp)
5722 {
5723         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5724         struct rpc_task *task;
5725         struct rpc_message msg = {
5726                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
5727                 .rpc_argp = &lgp->args,
5728                 .rpc_resp = &lgp->res,
5729         };
5730         struct rpc_task_setup task_setup_data = {
5731                 .rpc_client = server->client,
5732                 .rpc_message = &msg,
5733                 .callback_ops = &nfs4_layoutget_call_ops,
5734                 .callback_data = lgp,
5735                 .flags = RPC_TASK_ASYNC,
5736         };
5737         int status = 0;
5738
5739         dprintk("--> %s\n", __func__);
5740
5741         lgp->res.layoutp = &lgp->args.layout;
5742         lgp->res.seq_res.sr_slot = NULL;
5743         task = rpc_run_task(&task_setup_data);
5744         if (IS_ERR(task))
5745                 return PTR_ERR(task);
5746         status = nfs4_wait_for_completion_rpc_task(task);
5747         if (status == 0)
5748                 status = task->tk_status;
5749         if (status == 0)
5750                 status = pnfs_layout_process(lgp);
5751         rpc_put_task(task);
5752         dprintk("<-- %s status=%d\n", __func__, status);
5753         return status;
5754 }
5755
5756 static void
5757 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
5758 {
5759         struct nfs4_layoutreturn *lrp = calldata;
5760
5761         dprintk("--> %s\n", __func__);
5762         if (nfs41_setup_sequence(lrp->clp->cl_session, &lrp->args.seq_args,
5763                                 &lrp->res.seq_res, 0, task))
5764                 return;
5765         rpc_call_start(task);
5766 }
5767
5768 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
5769 {
5770         struct nfs4_layoutreturn *lrp = calldata;
5771         struct nfs_server *server;
5772         struct pnfs_layout_hdr *lo = lrp->args.layout;
5773
5774         dprintk("--> %s\n", __func__);
5775
5776         if (!nfs4_sequence_done(task, &lrp->res.seq_res))
5777                 return;
5778
5779         server = NFS_SERVER(lrp->args.inode);
5780         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5781                 nfs_restart_rpc(task, lrp->clp);
5782                 return;
5783         }
5784         spin_lock(&lo->plh_inode->i_lock);
5785         if (task->tk_status == 0) {
5786                 if (lrp->res.lrs_present) {
5787                         pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
5788                 } else
5789                         BUG_ON(!list_empty(&lo->plh_segs));
5790         }
5791         lo->plh_block_lgets--;
5792         spin_unlock(&lo->plh_inode->i_lock);
5793         dprintk("<-- %s\n", __func__);
5794 }
5795
5796 static void nfs4_layoutreturn_release(void *calldata)
5797 {
5798         struct nfs4_layoutreturn *lrp = calldata;
5799
5800         dprintk("--> %s\n", __func__);
5801         put_layout_hdr(lrp->args.layout);
5802         kfree(calldata);
5803         dprintk("<-- %s\n", __func__);
5804 }
5805
5806 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
5807         .rpc_call_prepare = nfs4_layoutreturn_prepare,
5808         .rpc_call_done = nfs4_layoutreturn_done,
5809         .rpc_release = nfs4_layoutreturn_release,
5810 };
5811
5812 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
5813 {
5814         struct rpc_task *task;
5815         struct rpc_message msg = {
5816                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
5817                 .rpc_argp = &lrp->args,
5818                 .rpc_resp = &lrp->res,
5819         };
5820         struct rpc_task_setup task_setup_data = {
5821                 .rpc_client = lrp->clp->cl_rpcclient,
5822                 .rpc_message = &msg,
5823                 .callback_ops = &nfs4_layoutreturn_call_ops,
5824                 .callback_data = lrp,
5825         };
5826         int status;
5827
5828         dprintk("--> %s\n", __func__);
5829         task = rpc_run_task(&task_setup_data);
5830         if (IS_ERR(task))
5831                 return PTR_ERR(task);
5832         status = task->tk_status;
5833         dprintk("<-- %s status=%d\n", __func__, status);
5834         rpc_put_task(task);
5835         return status;
5836 }
5837
5838 /*
5839  * Retrieve the list of Data Server devices from the MDS.
5840  */
5841 static int _nfs4_getdevicelist(struct nfs_server *server,
5842                                     const struct nfs_fh *fh,
5843                                     struct pnfs_devicelist *devlist)
5844 {
5845         struct nfs4_getdevicelist_args args = {
5846                 .fh = fh,
5847                 .layoutclass = server->pnfs_curr_ld->id,
5848         };
5849         struct nfs4_getdevicelist_res res = {
5850                 .devlist = devlist,
5851         };
5852         struct rpc_message msg = {
5853                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
5854                 .rpc_argp = &args,
5855                 .rpc_resp = &res,
5856         };
5857         int status;
5858
5859         dprintk("--> %s\n", __func__);
5860         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
5861                                 &res.seq_res, 0);
5862         dprintk("<-- %s status=%d\n", __func__, status);
5863         return status;
5864 }
5865
5866 int nfs4_proc_getdevicelist(struct nfs_server *server,
5867                             const struct nfs_fh *fh,
5868                             struct pnfs_devicelist *devlist)
5869 {
5870         struct nfs4_exception exception = { };
5871         int err;
5872
5873         do {
5874                 err = nfs4_handle_exception(server,
5875                                 _nfs4_getdevicelist(server, fh, devlist),
5876                                 &exception);
5877         } while (exception.retry);
5878
5879         dprintk("%s: err=%d, num_devs=%u\n", __func__,
5880                 err, devlist->num_devs);
5881
5882         return err;
5883 }
5884 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
5885
5886 static int
5887 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5888 {
5889         struct nfs4_getdeviceinfo_args args = {
5890                 .pdev = pdev,
5891         };
5892         struct nfs4_getdeviceinfo_res res = {
5893                 .pdev = pdev,
5894         };
5895         struct rpc_message msg = {
5896                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
5897                 .rpc_argp = &args,
5898                 .rpc_resp = &res,
5899         };
5900         int status;
5901
5902         dprintk("--> %s\n", __func__);
5903         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5904         dprintk("<-- %s status=%d\n", __func__, status);
5905
5906         return status;
5907 }
5908
5909 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5910 {
5911         struct nfs4_exception exception = { };
5912         int err;
5913
5914         do {
5915                 err = nfs4_handle_exception(server,
5916                                         _nfs4_proc_getdeviceinfo(server, pdev),
5917                                         &exception);
5918         } while (exception.retry);
5919         return err;
5920 }
5921 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
5922
5923 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
5924 {
5925         struct nfs4_layoutcommit_data *data = calldata;
5926         struct nfs_server *server = NFS_SERVER(data->args.inode);
5927
5928         if (nfs4_setup_sequence(server, &data->args.seq_args,
5929                                 &data->res.seq_res, 1, task))
5930                 return;
5931         rpc_call_start(task);
5932 }
5933
5934 static void
5935 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
5936 {
5937         struct nfs4_layoutcommit_data *data = calldata;
5938         struct nfs_server *server = NFS_SERVER(data->args.inode);
5939
5940         if (!nfs4_sequence_done(task, &data->res.seq_res))
5941                 return;
5942
5943         switch (task->tk_status) { /* Just ignore these failures */
5944         case NFS4ERR_DELEG_REVOKED: /* layout was recalled */
5945         case NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
5946         case NFS4ERR_BADLAYOUT:     /* no layout */
5947         case NFS4ERR_GRACE:         /* loca_recalim always false */
5948                 task->tk_status = 0;
5949         }
5950
5951         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5952                 nfs_restart_rpc(task, server->nfs_client);
5953                 return;
5954         }
5955
5956         if (task->tk_status == 0)
5957                 nfs_post_op_update_inode_force_wcc(data->args.inode,
5958                                                    data->res.fattr);
5959 }
5960
5961 static void nfs4_layoutcommit_release(void *calldata)
5962 {
5963         struct nfs4_layoutcommit_data *data = calldata;
5964         struct pnfs_layout_segment *lseg, *tmp;
5965
5966         pnfs_cleanup_layoutcommit(data);
5967         /* Matched by references in pnfs_set_layoutcommit */
5968         list_for_each_entry_safe(lseg, tmp, &data->lseg_list, pls_lc_list) {
5969                 list_del_init(&lseg->pls_lc_list);
5970                 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT,
5971                                        &lseg->pls_flags))
5972                         put_lseg(lseg);
5973         }
5974         put_rpccred(data->cred);
5975         kfree(data);
5976 }
5977
5978 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
5979         .rpc_call_prepare = nfs4_layoutcommit_prepare,
5980         .rpc_call_done = nfs4_layoutcommit_done,
5981         .rpc_release = nfs4_layoutcommit_release,
5982 };
5983
5984 int
5985 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
5986 {
5987         struct rpc_message msg = {
5988                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
5989                 .rpc_argp = &data->args,
5990                 .rpc_resp = &data->res,
5991                 .rpc_cred = data->cred,
5992         };
5993         struct rpc_task_setup task_setup_data = {
5994                 .task = &data->task,
5995                 .rpc_client = NFS_CLIENT(data->args.inode),
5996                 .rpc_message = &msg,
5997                 .callback_ops = &nfs4_layoutcommit_ops,
5998                 .callback_data = data,
5999                 .flags = RPC_TASK_ASYNC,
6000         };
6001         struct rpc_task *task;
6002         int status = 0;
6003
6004         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
6005                 "lbw: %llu inode %lu\n",
6006                 data->task.tk_pid, sync,
6007                 data->args.lastbytewritten,
6008                 data->args.inode->i_ino);
6009
6010         task = rpc_run_task(&task_setup_data);
6011         if (IS_ERR(task))
6012                 return PTR_ERR(task);
6013         if (sync == false)
6014                 goto out;
6015         status = nfs4_wait_for_completion_rpc_task(task);
6016         if (status != 0)
6017                 goto out;
6018         status = task->tk_status;
6019 out:
6020         dprintk("%s: status %d\n", __func__, status);
6021         rpc_put_task(task);
6022         return status;
6023 }
6024
6025 static int
6026 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6027                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6028 {
6029         struct nfs41_secinfo_no_name_args args = {
6030                 .style = SECINFO_STYLE_CURRENT_FH,
6031         };
6032         struct nfs4_secinfo_res res = {
6033                 .flavors = flavors,
6034         };
6035         struct rpc_message msg = {
6036                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6037                 .rpc_argp = &args,
6038                 .rpc_resp = &res,
6039         };
6040         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6041 }
6042
6043 static int
6044 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6045                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6046 {
6047         struct nfs4_exception exception = { };
6048         int err;
6049         do {
6050                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6051                 switch (err) {
6052                 case 0:
6053                 case -NFS4ERR_WRONGSEC:
6054                 case -NFS4ERR_NOTSUPP:
6055                         break;
6056                 default:
6057                         err = nfs4_handle_exception(server, err, &exception);
6058                 }
6059         } while (exception.retry);
6060         return err;
6061 }
6062
6063 static int
6064 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6065                     struct nfs_fsinfo *info)
6066 {
6067         int err;
6068         struct page *page;
6069         rpc_authflavor_t flavor;
6070         struct nfs4_secinfo_flavors *flavors;
6071
6072         page = alloc_page(GFP_KERNEL);
6073         if (!page) {
6074                 err = -ENOMEM;
6075                 goto out;
6076         }
6077
6078         flavors = page_address(page);
6079         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6080
6081         /*
6082          * Fall back on "guess and check" method if
6083          * the server doesn't support SECINFO_NO_NAME
6084          */
6085         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6086                 err = nfs4_find_root_sec(server, fhandle, info);
6087                 goto out_freepage;
6088         }
6089         if (err)
6090                 goto out_freepage;
6091
6092         flavor = nfs_find_best_sec(flavors);
6093         if (err == 0)
6094                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6095
6096 out_freepage:
6097         put_page(page);
6098         if (err == -EACCES)
6099                 return -EPERM;
6100 out:
6101         return err;
6102 }
6103 static int _nfs41_test_stateid(struct nfs_server *server, struct nfs4_state *state)
6104 {
6105         int status;
6106         struct nfs41_test_stateid_args args = {
6107                 .stateid = &state->stateid,
6108         };
6109         struct nfs41_test_stateid_res res;
6110         struct rpc_message msg = {
6111                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6112                 .rpc_argp = &args,
6113                 .rpc_resp = &res,
6114         };
6115         args.seq_args.sa_session = res.seq_res.sr_session = NULL;
6116         status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 0, 1);
6117         return status;
6118 }
6119
6120 static int nfs41_test_stateid(struct nfs_server *server, struct nfs4_state *state)
6121 {
6122         struct nfs4_exception exception = { };
6123         int err;
6124         do {
6125                 err = nfs4_handle_exception(server,
6126                                 _nfs41_test_stateid(server, state),
6127                                 &exception);
6128         } while (exception.retry);
6129         return err;
6130 }
6131
6132 static int _nfs4_free_stateid(struct nfs_server *server, struct nfs4_state *state)
6133 {
6134         int status;
6135         struct nfs41_free_stateid_args args = {
6136                 .stateid = &state->stateid,
6137         };
6138         struct nfs41_free_stateid_res res;
6139         struct rpc_message msg = {
6140                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6141                 .rpc_argp = &args,
6142                 .rpc_resp = &res,
6143         };
6144
6145         args.seq_args.sa_session = res.seq_res.sr_session = NULL;
6146         status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 0, 1);
6147         return status;
6148 }
6149
6150 static int nfs41_free_stateid(struct nfs_server *server, struct nfs4_state *state)
6151 {
6152         struct nfs4_exception exception = { };
6153         int err;
6154         do {
6155                 err = nfs4_handle_exception(server,
6156                                 _nfs4_free_stateid(server, state),
6157                                 &exception);
6158         } while (exception.retry);
6159         return err;
6160 }
6161 #endif /* CONFIG_NFS_V4_1 */
6162
6163 struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6164         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6165         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6166         .recover_open   = nfs4_open_reclaim,
6167         .recover_lock   = nfs4_lock_reclaim,
6168         .establish_clid = nfs4_init_clientid,
6169         .get_clid_cred  = nfs4_get_setclientid_cred,
6170 };
6171
6172 #if defined(CONFIG_NFS_V4_1)
6173 struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6174         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6175         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6176         .recover_open   = nfs4_open_reclaim,
6177         .recover_lock   = nfs4_lock_reclaim,
6178         .establish_clid = nfs41_init_clientid,
6179         .get_clid_cred  = nfs4_get_exchange_id_cred,
6180         .reclaim_complete = nfs41_proc_reclaim_complete,
6181 };
6182 #endif /* CONFIG_NFS_V4_1 */
6183
6184 struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6185         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6186         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6187         .recover_open   = nfs4_open_expired,
6188         .recover_lock   = nfs4_lock_expired,
6189         .establish_clid = nfs4_init_clientid,
6190         .get_clid_cred  = nfs4_get_setclientid_cred,
6191 };
6192
6193 #if defined(CONFIG_NFS_V4_1)
6194 struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
6195         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6196         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6197         .recover_open   = nfs41_open_expired,
6198         .recover_lock   = nfs41_lock_expired,
6199         .establish_clid = nfs41_init_clientid,
6200         .get_clid_cred  = nfs4_get_exchange_id_cred,
6201 };
6202 #endif /* CONFIG_NFS_V4_1 */
6203
6204 struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
6205         .sched_state_renewal = nfs4_proc_async_renew,
6206         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
6207         .renew_lease = nfs4_proc_renew,
6208 };
6209
6210 #if defined(CONFIG_NFS_V4_1)
6211 struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
6212         .sched_state_renewal = nfs41_proc_async_sequence,
6213         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
6214         .renew_lease = nfs4_proc_sequence,
6215 };
6216 #endif
6217
6218 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
6219         .minor_version = 0,
6220         .call_sync = _nfs4_call_sync,
6221         .validate_stateid = nfs4_validate_delegation_stateid,
6222         .find_root_sec = nfs4_find_root_sec,
6223         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
6224         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
6225         .state_renewal_ops = &nfs40_state_renewal_ops,
6226 };
6227
6228 #if defined(CONFIG_NFS_V4_1)
6229 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
6230         .minor_version = 1,
6231         .call_sync = _nfs4_call_sync_session,
6232         .validate_stateid = nfs41_validate_delegation_stateid,
6233         .find_root_sec = nfs41_find_root_sec,
6234         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
6235         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
6236         .state_renewal_ops = &nfs41_state_renewal_ops,
6237 };
6238 #endif
6239
6240 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6241         [0] = &nfs_v4_0_minor_ops,
6242 #if defined(CONFIG_NFS_V4_1)
6243         [1] = &nfs_v4_1_minor_ops,
6244 #endif
6245 };
6246
6247 static const struct inode_operations nfs4_file_inode_operations = {
6248         .permission     = nfs_permission,
6249         .getattr        = nfs_getattr,
6250         .setattr        = nfs_setattr,
6251         .getxattr       = generic_getxattr,
6252         .setxattr       = generic_setxattr,
6253         .listxattr      = generic_listxattr,
6254         .removexattr    = generic_removexattr,
6255 };
6256
6257 const struct nfs_rpc_ops nfs_v4_clientops = {
6258         .version        = 4,                    /* protocol version */
6259         .dentry_ops     = &nfs4_dentry_operations,
6260         .dir_inode_ops  = &nfs4_dir_inode_operations,
6261         .file_inode_ops = &nfs4_file_inode_operations,
6262         .getroot        = nfs4_proc_get_root,
6263         .getattr        = nfs4_proc_getattr,
6264         .setattr        = nfs4_proc_setattr,
6265         .lookupfh       = nfs4_proc_lookupfh,
6266