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nfs4.1: Add SP4_MACH_CRED secinfo support
[linux-2.6-block.git] / fs / nfs / nfs4proc.c
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1/*
2 * fs/nfs/nfs4proc.c
3 *
4 * Client-side procedure declarations for NFSv4.
5 *
6 * Copyright (c) 2002 The Regents of the University of Michigan.
7 * All rights reserved.
8 *
9 * Kendrick Smith <kmsmith@umich.edu>
10 * Andy Adamson <andros@umich.edu>
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 *
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its
22 * contributors may be used to endorse or promote products derived
23 * from this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
26 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
27 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
28 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
32 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
33 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
34 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
35 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 */
37
38#include <linux/mm.h>
39#include <linux/delay.h>
40#include <linux/errno.h>
41#include <linux/string.h>
42#include <linux/ratelimit.h>
43#include <linux/printk.h>
44#include <linux/slab.h>
45#include <linux/sunrpc/clnt.h>
46#include <linux/nfs.h>
47#include <linux/nfs4.h>
48#include <linux/nfs_fs.h>
49#include <linux/nfs_page.h>
50#include <linux/nfs_mount.h>
51#include <linux/namei.h>
52#include <linux/mount.h>
53#include <linux/module.h>
54#include <linux/nfs_idmap.h>
55#include <linux/xattr.h>
56#include <linux/utsname.h>
57#include <linux/freezer.h>
58
59#include "nfs4_fs.h"
60#include "delegation.h"
61#include "internal.h"
62#include "iostat.h"
63#include "callback.h"
64#include "pnfs.h"
65#include "netns.h"
66#include "nfs4session.h"
67#include "fscache.h"
68
69#include "nfs4trace.h"
70
71#define NFSDBG_FACILITY NFSDBG_PROC
72
73#define NFS4_POLL_RETRY_MIN (HZ/10)
74#define NFS4_POLL_RETRY_MAX (15*HZ)
75
76struct nfs4_opendata;
77static int _nfs4_proc_open(struct nfs4_opendata *data);
78static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
79static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
80static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
81static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
82static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *, struct nfs4_label *label);
83static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label);
84static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
85 struct nfs_fattr *fattr, struct iattr *sattr,
86 struct nfs4_state *state, struct nfs4_label *ilabel,
87 struct nfs4_label *olabel);
88#ifdef CONFIG_NFS_V4_1
89static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
90 struct rpc_cred *);
91static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *,
92 struct rpc_cred *);
93#endif
94
95#ifdef CONFIG_NFS_V4_SECURITY_LABEL
96static inline struct nfs4_label *
97nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
98 struct iattr *sattr, struct nfs4_label *label)
99{
100 int err;
101
102 if (label == NULL)
103 return NULL;
104
105 if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0)
106 return NULL;
107
108 if (NFS_SERVER(dir)->nfs_client->cl_minorversion < 2)
109 return NULL;
110
111 err = security_dentry_init_security(dentry, sattr->ia_mode,
112 &dentry->d_name, (void **)&label->label, &label->len);
113 if (err == 0)
114 return label;
115
116 return NULL;
117}
118static inline void
119nfs4_label_release_security(struct nfs4_label *label)
120{
121 if (label)
122 security_release_secctx(label->label, label->len);
123}
124static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
125{
126 if (label)
127 return server->attr_bitmask;
128
129 return server->attr_bitmask_nl;
130}
131#else
132static inline struct nfs4_label *
133nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
134 struct iattr *sattr, struct nfs4_label *l)
135{ return NULL; }
136static inline void
137nfs4_label_release_security(struct nfs4_label *label)
138{ return; }
139static inline u32 *
140nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
141{ return server->attr_bitmask; }
142#endif
143
144/* Prevent leaks of NFSv4 errors into userland */
145static int nfs4_map_errors(int err)
146{
147 if (err >= -1000)
148 return err;
149 switch (err) {
150 case -NFS4ERR_RESOURCE:
151 case -NFS4ERR_LAYOUTTRYLATER:
152 case -NFS4ERR_RECALLCONFLICT:
153 return -EREMOTEIO;
154 case -NFS4ERR_WRONGSEC:
155 return -EPERM;
156 case -NFS4ERR_BADOWNER:
157 case -NFS4ERR_BADNAME:
158 return -EINVAL;
159 case -NFS4ERR_SHARE_DENIED:
160 return -EACCES;
161 case -NFS4ERR_MINOR_VERS_MISMATCH:
162 return -EPROTONOSUPPORT;
163 case -NFS4ERR_ACCESS:
164 return -EACCES;
165 case -NFS4ERR_FILE_OPEN:
166 return -EBUSY;
167 default:
168 dprintk("%s could not handle NFSv4 error %d\n",
169 __func__, -err);
170 break;
171 }
172 return -EIO;
173}
174
175/*
176 * This is our standard bitmap for GETATTR requests.
177 */
178const u32 nfs4_fattr_bitmap[3] = {
179 FATTR4_WORD0_TYPE
180 | FATTR4_WORD0_CHANGE
181 | FATTR4_WORD0_SIZE
182 | FATTR4_WORD0_FSID
183 | FATTR4_WORD0_FILEID,
184 FATTR4_WORD1_MODE
185 | FATTR4_WORD1_NUMLINKS
186 | FATTR4_WORD1_OWNER
187 | FATTR4_WORD1_OWNER_GROUP
188 | FATTR4_WORD1_RAWDEV
189 | FATTR4_WORD1_SPACE_USED
190 | FATTR4_WORD1_TIME_ACCESS
191 | FATTR4_WORD1_TIME_METADATA
192 | FATTR4_WORD1_TIME_MODIFY,
193#ifdef CONFIG_NFS_V4_SECURITY_LABEL
194 FATTR4_WORD2_SECURITY_LABEL
195#endif
196};
197
198static const u32 nfs4_pnfs_open_bitmap[3] = {
199 FATTR4_WORD0_TYPE
200 | FATTR4_WORD0_CHANGE
201 | FATTR4_WORD0_SIZE
202 | FATTR4_WORD0_FSID
203 | FATTR4_WORD0_FILEID,
204 FATTR4_WORD1_MODE
205 | FATTR4_WORD1_NUMLINKS
206 | FATTR4_WORD1_OWNER
207 | FATTR4_WORD1_OWNER_GROUP
208 | FATTR4_WORD1_RAWDEV
209 | FATTR4_WORD1_SPACE_USED
210 | FATTR4_WORD1_TIME_ACCESS
211 | FATTR4_WORD1_TIME_METADATA
212 | FATTR4_WORD1_TIME_MODIFY,
213 FATTR4_WORD2_MDSTHRESHOLD
214};
215
216static const u32 nfs4_open_noattr_bitmap[3] = {
217 FATTR4_WORD0_TYPE
218 | FATTR4_WORD0_CHANGE
219 | FATTR4_WORD0_FILEID,
220};
221
222const u32 nfs4_statfs_bitmap[3] = {
223 FATTR4_WORD0_FILES_AVAIL
224 | FATTR4_WORD0_FILES_FREE
225 | FATTR4_WORD0_FILES_TOTAL,
226 FATTR4_WORD1_SPACE_AVAIL
227 | FATTR4_WORD1_SPACE_FREE
228 | FATTR4_WORD1_SPACE_TOTAL
229};
230
231const u32 nfs4_pathconf_bitmap[3] = {
232 FATTR4_WORD0_MAXLINK
233 | FATTR4_WORD0_MAXNAME,
234 0
235};
236
237const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
238 | FATTR4_WORD0_MAXREAD
239 | FATTR4_WORD0_MAXWRITE
240 | FATTR4_WORD0_LEASE_TIME,
241 FATTR4_WORD1_TIME_DELTA
242 | FATTR4_WORD1_FS_LAYOUT_TYPES,
243 FATTR4_WORD2_LAYOUT_BLKSIZE
244};
245
246const u32 nfs4_fs_locations_bitmap[3] = {
247 FATTR4_WORD0_TYPE
248 | FATTR4_WORD0_CHANGE
249 | FATTR4_WORD0_SIZE
250 | FATTR4_WORD0_FSID
251 | FATTR4_WORD0_FILEID
252 | FATTR4_WORD0_FS_LOCATIONS,
253 FATTR4_WORD1_MODE
254 | FATTR4_WORD1_NUMLINKS
255 | FATTR4_WORD1_OWNER
256 | FATTR4_WORD1_OWNER_GROUP
257 | FATTR4_WORD1_RAWDEV
258 | FATTR4_WORD1_SPACE_USED
259 | FATTR4_WORD1_TIME_ACCESS
260 | FATTR4_WORD1_TIME_METADATA
261 | FATTR4_WORD1_TIME_MODIFY
262 | FATTR4_WORD1_MOUNTED_ON_FILEID,
263};
264
265static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
266 struct nfs4_readdir_arg *readdir)
267{
268 __be32 *start, *p;
269
270 if (cookie > 2) {
271 readdir->cookie = cookie;
272 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
273 return;
274 }
275
276 readdir->cookie = 0;
277 memset(&readdir->verifier, 0, sizeof(readdir->verifier));
278 if (cookie == 2)
279 return;
280
281 /*
282 * NFSv4 servers do not return entries for '.' and '..'
283 * Therefore, we fake these entries here. We let '.'
284 * have cookie 0 and '..' have cookie 1. Note that
285 * when talking to the server, we always send cookie 0
286 * instead of 1 or 2.
287 */
288 start = p = kmap_atomic(*readdir->pages);
289
290 if (cookie == 0) {
291 *p++ = xdr_one; /* next */
292 *p++ = xdr_zero; /* cookie, first word */
293 *p++ = xdr_one; /* cookie, second word */
294 *p++ = xdr_one; /* entry len */
295 memcpy(p, ".\0\0\0", 4); /* entry */
296 p++;
297 *p++ = xdr_one; /* bitmap length */
298 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
299 *p++ = htonl(8); /* attribute buffer length */
300 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
301 }
302
303 *p++ = xdr_one; /* next */
304 *p++ = xdr_zero; /* cookie, first word */
305 *p++ = xdr_two; /* cookie, second word */
306 *p++ = xdr_two; /* entry len */
307 memcpy(p, "..\0\0", 4); /* entry */
308 p++;
309 *p++ = xdr_one; /* bitmap length */
310 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
311 *p++ = htonl(8); /* attribute buffer length */
312 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
313
314 readdir->pgbase = (char *)p - (char *)start;
315 readdir->count -= readdir->pgbase;
316 kunmap_atomic(start);
317}
318
319static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
320{
321 int res = 0;
322
323 might_sleep();
324
325 if (*timeout <= 0)
326 *timeout = NFS4_POLL_RETRY_MIN;
327 if (*timeout > NFS4_POLL_RETRY_MAX)
328 *timeout = NFS4_POLL_RETRY_MAX;
329 freezable_schedule_timeout_killable_unsafe(*timeout);
330 if (fatal_signal_pending(current))
331 res = -ERESTARTSYS;
332 *timeout <<= 1;
333 return res;
334}
335
336/* This is the error handling routine for processes that are allowed
337 * to sleep.
338 */
339static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
340{
341 struct nfs_client *clp = server->nfs_client;
342 struct nfs4_state *state = exception->state;
343 struct inode *inode = exception->inode;
344 int ret = errorcode;
345
346 exception->retry = 0;
347 switch(errorcode) {
348 case 0:
349 return 0;
350 case -NFS4ERR_OPENMODE:
351 if (inode && nfs4_have_delegation(inode, FMODE_READ)) {
352 nfs4_inode_return_delegation(inode);
353 exception->retry = 1;
354 return 0;
355 }
356 if (state == NULL)
357 break;
358 ret = nfs4_schedule_stateid_recovery(server, state);
359 if (ret < 0)
360 break;
361 goto wait_on_recovery;
362 case -NFS4ERR_DELEG_REVOKED:
363 case -NFS4ERR_ADMIN_REVOKED:
364 case -NFS4ERR_BAD_STATEID:
365 if (inode != NULL && nfs4_have_delegation(inode, FMODE_READ)) {
366 nfs_remove_bad_delegation(inode);
367 exception->retry = 1;
368 break;
369 }
370 if (state == NULL)
371 break;
372 ret = nfs4_schedule_stateid_recovery(server, state);
373 if (ret < 0)
374 break;
375 goto wait_on_recovery;
376 case -NFS4ERR_EXPIRED:
377 if (state != NULL) {
378 ret = nfs4_schedule_stateid_recovery(server, state);
379 if (ret < 0)
380 break;
381 }
382 case -NFS4ERR_STALE_STATEID:
383 case -NFS4ERR_STALE_CLIENTID:
384 nfs4_schedule_lease_recovery(clp);
385 goto wait_on_recovery;
386#if defined(CONFIG_NFS_V4_1)
387 case -NFS4ERR_BADSESSION:
388 case -NFS4ERR_BADSLOT:
389 case -NFS4ERR_BAD_HIGH_SLOT:
390 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
391 case -NFS4ERR_DEADSESSION:
392 case -NFS4ERR_SEQ_FALSE_RETRY:
393 case -NFS4ERR_SEQ_MISORDERED:
394 dprintk("%s ERROR: %d Reset session\n", __func__,
395 errorcode);
396 nfs4_schedule_session_recovery(clp->cl_session, errorcode);
397 goto wait_on_recovery;
398#endif /* defined(CONFIG_NFS_V4_1) */
399 case -NFS4ERR_FILE_OPEN:
400 if (exception->timeout > HZ) {
401 /* We have retried a decent amount, time to
402 * fail
403 */
404 ret = -EBUSY;
405 break;
406 }
407 case -NFS4ERR_GRACE:
408 case -NFS4ERR_DELAY:
409 ret = nfs4_delay(server->client, &exception->timeout);
410 if (ret != 0)
411 break;
412 case -NFS4ERR_RETRY_UNCACHED_REP:
413 case -NFS4ERR_OLD_STATEID:
414 exception->retry = 1;
415 break;
416 case -NFS4ERR_BADOWNER:
417 /* The following works around a Linux server bug! */
418 case -NFS4ERR_BADNAME:
419 if (server->caps & NFS_CAP_UIDGID_NOMAP) {
420 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
421 exception->retry = 1;
422 printk(KERN_WARNING "NFS: v4 server %s "
423 "does not accept raw "
424 "uid/gids. "
425 "Reenabling the idmapper.\n",
426 server->nfs_client->cl_hostname);
427 }
428 }
429 /* We failed to handle the error */
430 return nfs4_map_errors(ret);
431wait_on_recovery:
432 ret = nfs4_wait_clnt_recover(clp);
433 if (ret == 0)
434 exception->retry = 1;
435 return ret;
436}
437
438/*
439 * Return 'true' if 'clp' is using an rpc_client that is integrity protected
440 * or 'false' otherwise.
441 */
442static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
443{
444 rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
445
446 if (flavor == RPC_AUTH_GSS_KRB5I ||
447 flavor == RPC_AUTH_GSS_KRB5P)
448 return true;
449
450 return false;
451}
452
453static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
454{
455 spin_lock(&clp->cl_lock);
456 if (time_before(clp->cl_last_renewal,timestamp))
457 clp->cl_last_renewal = timestamp;
458 spin_unlock(&clp->cl_lock);
459}
460
461static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
462{
463 do_renew_lease(server->nfs_client, timestamp);
464}
465
466struct nfs4_call_sync_data {
467 const struct nfs_server *seq_server;
468 struct nfs4_sequence_args *seq_args;
469 struct nfs4_sequence_res *seq_res;
470};
471
472static void nfs4_init_sequence(struct nfs4_sequence_args *args,
473 struct nfs4_sequence_res *res, int cache_reply)
474{
475 args->sa_slot = NULL;
476 args->sa_cache_this = cache_reply;
477 args->sa_privileged = 0;
478
479 res->sr_slot = NULL;
480}
481
482static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
483{
484 args->sa_privileged = 1;
485}
486
487static int nfs40_setup_sequence(const struct nfs_server *server,
488 struct nfs4_sequence_args *args,
489 struct nfs4_sequence_res *res,
490 struct rpc_task *task)
491{
492 struct nfs4_slot_table *tbl = server->nfs_client->cl_slot_tbl;
493 struct nfs4_slot *slot;
494
495 /* slot already allocated? */
496 if (res->sr_slot != NULL)
497 goto out_start;
498
499 spin_lock(&tbl->slot_tbl_lock);
500 if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
501 goto out_sleep;
502
503 slot = nfs4_alloc_slot(tbl);
504 if (IS_ERR(slot)) {
505 if (slot == ERR_PTR(-ENOMEM))
506 task->tk_timeout = HZ >> 2;
507 goto out_sleep;
508 }
509 spin_unlock(&tbl->slot_tbl_lock);
510
511 args->sa_slot = slot;
512 res->sr_slot = slot;
513
514out_start:
515 rpc_call_start(task);
516 return 0;
517
518out_sleep:
519 if (args->sa_privileged)
520 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
521 NULL, RPC_PRIORITY_PRIVILEGED);
522 else
523 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
524 spin_unlock(&tbl->slot_tbl_lock);
525 return -EAGAIN;
526}
527
528static int nfs40_sequence_done(struct rpc_task *task,
529 struct nfs4_sequence_res *res)
530{
531 struct nfs4_slot *slot = res->sr_slot;
532 struct nfs4_slot_table *tbl;
533
534 if (!RPC_WAS_SENT(task))
535 goto out;
536
537 tbl = slot->table;
538 spin_lock(&tbl->slot_tbl_lock);
539 if (!nfs41_wake_and_assign_slot(tbl, slot))
540 nfs4_free_slot(tbl, slot);
541 spin_unlock(&tbl->slot_tbl_lock);
542
543 res->sr_slot = NULL;
544out:
545 return 1;
546}
547
548#if defined(CONFIG_NFS_V4_1)
549
550static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
551{
552 struct nfs4_session *session;
553 struct nfs4_slot_table *tbl;
554 bool send_new_highest_used_slotid = false;
555
556 if (!res->sr_slot) {
557 /* just wake up the next guy waiting since
558 * we may have not consumed a slot after all */
559 dprintk("%s: No slot\n", __func__);
560 return;
561 }
562 tbl = res->sr_slot->table;
563 session = tbl->session;
564
565 spin_lock(&tbl->slot_tbl_lock);
566 /* Be nice to the server: try to ensure that the last transmitted
567 * value for highest_user_slotid <= target_highest_slotid
568 */
569 if (tbl->highest_used_slotid > tbl->target_highest_slotid)
570 send_new_highest_used_slotid = true;
571
572 if (nfs41_wake_and_assign_slot(tbl, res->sr_slot)) {
573 send_new_highest_used_slotid = false;
574 goto out_unlock;
575 }
576 nfs4_free_slot(tbl, res->sr_slot);
577
578 if (tbl->highest_used_slotid != NFS4_NO_SLOT)
579 send_new_highest_used_slotid = false;
580out_unlock:
581 spin_unlock(&tbl->slot_tbl_lock);
582 res->sr_slot = NULL;
583 if (send_new_highest_used_slotid)
584 nfs41_server_notify_highest_slotid_update(session->clp);
585}
586
587static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
588{
589 struct nfs4_session *session;
590 struct nfs4_slot *slot;
591 struct nfs_client *clp;
592 bool interrupted = false;
593 int ret = 1;
594
595 /* don't increment the sequence number if the task wasn't sent */
596 if (!RPC_WAS_SENT(task))
597 goto out;
598
599 slot = res->sr_slot;
600 session = slot->table->session;
601
602 if (slot->interrupted) {
603 slot->interrupted = 0;
604 interrupted = true;
605 }
606
607 trace_nfs4_sequence_done(session, res);
608 /* Check the SEQUENCE operation status */
609 switch (res->sr_status) {
610 case 0:
611 /* Update the slot's sequence and clientid lease timer */
612 ++slot->seq_nr;
613 clp = session->clp;
614 do_renew_lease(clp, res->sr_timestamp);
615 /* Check sequence flags */
616 if (res->sr_status_flags != 0)
617 nfs4_schedule_lease_recovery(clp);
618 nfs41_update_target_slotid(slot->table, slot, res);
619 break;
620 case 1:
621 /*
622 * sr_status remains 1 if an RPC level error occurred.
623 * The server may or may not have processed the sequence
624 * operation..
625 * Mark the slot as having hosted an interrupted RPC call.
626 */
627 slot->interrupted = 1;
628 goto out;
629 case -NFS4ERR_DELAY:
630 /* The server detected a resend of the RPC call and
631 * returned NFS4ERR_DELAY as per Section 2.10.6.2
632 * of RFC5661.
633 */
634 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
635 __func__,
636 slot->slot_nr,
637 slot->seq_nr);
638 goto out_retry;
639 case -NFS4ERR_BADSLOT:
640 /*
641 * The slot id we used was probably retired. Try again
642 * using a different slot id.
643 */
644 goto retry_nowait;
645 case -NFS4ERR_SEQ_MISORDERED:
646 /*
647 * Was the last operation on this sequence interrupted?
648 * If so, retry after bumping the sequence number.
649 */
650 if (interrupted) {
651 ++slot->seq_nr;
652 goto retry_nowait;
653 }
654 /*
655 * Could this slot have been previously retired?
656 * If so, then the server may be expecting seq_nr = 1!
657 */
658 if (slot->seq_nr != 1) {
659 slot->seq_nr = 1;
660 goto retry_nowait;
661 }
662 break;
663 case -NFS4ERR_SEQ_FALSE_RETRY:
664 ++slot->seq_nr;
665 goto retry_nowait;
666 default:
667 /* Just update the slot sequence no. */
668 ++slot->seq_nr;
669 }
670out:
671 /* The session may be reset by one of the error handlers. */
672 dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
673 nfs41_sequence_free_slot(res);
674 return ret;
675retry_nowait:
676 if (rpc_restart_call_prepare(task)) {
677 task->tk_status = 0;
678 ret = 0;
679 }
680 goto out;
681out_retry:
682 if (!rpc_restart_call(task))
683 goto out;
684 rpc_delay(task, NFS4_POLL_RETRY_MAX);
685 return 0;
686}
687
688static int nfs4_sequence_done(struct rpc_task *task,
689 struct nfs4_sequence_res *res)
690{
691 if (res->sr_slot == NULL)
692 return 1;
693 if (!res->sr_slot->table->session)
694 return nfs40_sequence_done(task, res);
695 return nfs41_sequence_done(task, res);
696}
697
698int nfs41_setup_sequence(struct nfs4_session *session,
699 struct nfs4_sequence_args *args,
700 struct nfs4_sequence_res *res,
701 struct rpc_task *task)
702{
703 struct nfs4_slot *slot;
704 struct nfs4_slot_table *tbl;
705
706 dprintk("--> %s\n", __func__);
707 /* slot already allocated? */
708 if (res->sr_slot != NULL)
709 goto out_success;
710
711 tbl = &session->fc_slot_table;
712
713 task->tk_timeout = 0;
714
715 spin_lock(&tbl->slot_tbl_lock);
716 if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state) &&
717 !args->sa_privileged) {
718 /* The state manager will wait until the slot table is empty */
719 dprintk("%s session is draining\n", __func__);
720 goto out_sleep;
721 }
722
723 slot = nfs4_alloc_slot(tbl);
724 if (IS_ERR(slot)) {
725 /* If out of memory, try again in 1/4 second */
726 if (slot == ERR_PTR(-ENOMEM))
727 task->tk_timeout = HZ >> 2;
728 dprintk("<-- %s: no free slots\n", __func__);
729 goto out_sleep;
730 }
731 spin_unlock(&tbl->slot_tbl_lock);
732
733 args->sa_slot = slot;
734
735 dprintk("<-- %s slotid=%u seqid=%u\n", __func__,
736 slot->slot_nr, slot->seq_nr);
737
738 res->sr_slot = slot;
739 res->sr_timestamp = jiffies;
740 res->sr_status_flags = 0;
741 /*
742 * sr_status is only set in decode_sequence, and so will remain
743 * set to 1 if an rpc level failure occurs.
744 */
745 res->sr_status = 1;
746 trace_nfs4_setup_sequence(session, args);
747out_success:
748 rpc_call_start(task);
749 return 0;
750out_sleep:
751 /* Privileged tasks are queued with top priority */
752 if (args->sa_privileged)
753 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
754 NULL, RPC_PRIORITY_PRIVILEGED);
755 else
756 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
757 spin_unlock(&tbl->slot_tbl_lock);
758 return -EAGAIN;
759}
760EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
761
762static int nfs4_setup_sequence(const struct nfs_server *server,
763 struct nfs4_sequence_args *args,
764 struct nfs4_sequence_res *res,
765 struct rpc_task *task)
766{
767 struct nfs4_session *session = nfs4_get_session(server);
768 int ret = 0;
769
770 if (!session)
771 return nfs40_setup_sequence(server, args, res, task);
772
773 dprintk("--> %s clp %p session %p sr_slot %u\n",
774 __func__, session->clp, session, res->sr_slot ?
775 res->sr_slot->slot_nr : NFS4_NO_SLOT);
776
777 ret = nfs41_setup_sequence(session, args, res, task);
778
779 dprintk("<-- %s status=%d\n", __func__, ret);
780 return ret;
781}
782
783static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
784{
785 struct nfs4_call_sync_data *data = calldata;
786 struct nfs4_session *session = nfs4_get_session(data->seq_server);
787
788 dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
789
790 nfs41_setup_sequence(session, data->seq_args, data->seq_res, task);
791}
792
793static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
794{
795 struct nfs4_call_sync_data *data = calldata;
796
797 nfs41_sequence_done(task, data->seq_res);
798}
799
800static const struct rpc_call_ops nfs41_call_sync_ops = {
801 .rpc_call_prepare = nfs41_call_sync_prepare,
802 .rpc_call_done = nfs41_call_sync_done,
803};
804
805#else /* !CONFIG_NFS_V4_1 */
806
807static int nfs4_setup_sequence(const struct nfs_server *server,
808 struct nfs4_sequence_args *args,
809 struct nfs4_sequence_res *res,
810 struct rpc_task *task)
811{
812 return nfs40_setup_sequence(server, args, res, task);
813}
814
815static int nfs4_sequence_done(struct rpc_task *task,
816 struct nfs4_sequence_res *res)
817{
818 return nfs40_sequence_done(task, res);
819}
820
821#endif /* !CONFIG_NFS_V4_1 */
822
823static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
824{
825 struct nfs4_call_sync_data *data = calldata;
826 nfs4_setup_sequence(data->seq_server,
827 data->seq_args, data->seq_res, task);
828}
829
830static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
831{
832 struct nfs4_call_sync_data *data = calldata;
833 nfs4_sequence_done(task, data->seq_res);
834}
835
836static const struct rpc_call_ops nfs40_call_sync_ops = {
837 .rpc_call_prepare = nfs40_call_sync_prepare,
838 .rpc_call_done = nfs40_call_sync_done,
839};
840
841static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
842 struct nfs_server *server,
843 struct rpc_message *msg,
844 struct nfs4_sequence_args *args,
845 struct nfs4_sequence_res *res)
846{
847 int ret;
848 struct rpc_task *task;
849 struct nfs_client *clp = server->nfs_client;
850 struct nfs4_call_sync_data data = {
851 .seq_server = server,
852 .seq_args = args,
853 .seq_res = res,
854 };
855 struct rpc_task_setup task_setup = {
856 .rpc_client = clnt,
857 .rpc_message = msg,
858 .callback_ops = clp->cl_mvops->call_sync_ops,
859 .callback_data = &data
860 };
861
862 task = rpc_run_task(&task_setup);
863 if (IS_ERR(task))
864 ret = PTR_ERR(task);
865 else {
866 ret = task->tk_status;
867 rpc_put_task(task);
868 }
869 return ret;
870}
871
872static
873int nfs4_call_sync(struct rpc_clnt *clnt,
874 struct nfs_server *server,
875 struct rpc_message *msg,
876 struct nfs4_sequence_args *args,
877 struct nfs4_sequence_res *res,
878 int cache_reply)
879{
880 nfs4_init_sequence(args, res, cache_reply);
881 return nfs4_call_sync_sequence(clnt, server, msg, args, res);
882}
883
884static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
885{
886 struct nfs_inode *nfsi = NFS_I(dir);
887
888 spin_lock(&dir->i_lock);
889 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
890 if (!cinfo->atomic || cinfo->before != dir->i_version)
891 nfs_force_lookup_revalidate(dir);
892 dir->i_version = cinfo->after;
893 nfs_fscache_invalidate(dir);
894 spin_unlock(&dir->i_lock);
895}
896
897struct nfs4_opendata {
898 struct kref kref;
899 struct nfs_openargs o_arg;
900 struct nfs_openres o_res;
901 struct nfs_open_confirmargs c_arg;
902 struct nfs_open_confirmres c_res;
903 struct nfs4_string owner_name;
904 struct nfs4_string group_name;
905 struct nfs_fattr f_attr;
906 struct nfs4_label *f_label;
907 struct dentry *dir;
908 struct dentry *dentry;
909 struct nfs4_state_owner *owner;
910 struct nfs4_state *state;
911 struct iattr attrs;
912 unsigned long timestamp;
913 unsigned int rpc_done : 1;
914 unsigned int is_recover : 1;
915 int rpc_status;
916 int cancelled;
917};
918
919static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
920 int err, struct nfs4_exception *exception)
921{
922 if (err != -EINVAL)
923 return false;
924 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
925 return false;
926 server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
927 exception->retry = 1;
928 return true;
929}
930
931static enum open_claim_type4
932nfs4_map_atomic_open_claim(struct nfs_server *server,
933 enum open_claim_type4 claim)
934{
935 if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
936 return claim;
937 switch (claim) {
938 default:
939 return claim;
940 case NFS4_OPEN_CLAIM_FH:
941 return NFS4_OPEN_CLAIM_NULL;
942 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
943 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
944 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
945 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
946 }
947}
948
949static void nfs4_init_opendata_res(struct nfs4_opendata *p)
950{
951 p->o_res.f_attr = &p->f_attr;
952 p->o_res.f_label = p->f_label;
953 p->o_res.seqid = p->o_arg.seqid;
954 p->c_res.seqid = p->c_arg.seqid;
955 p->o_res.server = p->o_arg.server;
956 p->o_res.access_request = p->o_arg.access;
957 nfs_fattr_init(&p->f_attr);
958 nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
959}
960
961static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
962 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
963 const struct iattr *attrs,
964 struct nfs4_label *label,
965 enum open_claim_type4 claim,
966 gfp_t gfp_mask)
967{
968 struct dentry *parent = dget_parent(dentry);
969 struct inode *dir = parent->d_inode;
970 struct nfs_server *server = NFS_SERVER(dir);
971 struct nfs4_opendata *p;
972
973 p = kzalloc(sizeof(*p), gfp_mask);
974 if (p == NULL)
975 goto err;
976
977 p->f_label = nfs4_label_alloc(server, gfp_mask);
978 if (IS_ERR(p->f_label))
979 goto err_free_p;
980
981 p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
982 if (p->o_arg.seqid == NULL)
983 goto err_free_label;
984 nfs_sb_active(dentry->d_sb);
985 p->dentry = dget(dentry);
986 p->dir = parent;
987 p->owner = sp;
988 atomic_inc(&sp->so_count);
989 p->o_arg.open_flags = flags;
990 p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
991 /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
992 * will return permission denied for all bits until close */
993 if (!(flags & O_EXCL)) {
994 /* ask server to check for all possible rights as results
995 * are cached */
996 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
997 NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
998 }
999 p->o_arg.clientid = server->nfs_client->cl_clientid;
1000 p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1001 p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1002 p->o_arg.name = &dentry->d_name;
1003 p->o_arg.server = server;
1004 p->o_arg.bitmask = nfs4_bitmask(server, label);
1005 p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1006 p->o_arg.label = label;
1007 p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1008 switch (p->o_arg.claim) {
1009 case NFS4_OPEN_CLAIM_NULL:
1010 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1011 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1012 p->o_arg.fh = NFS_FH(dir);
1013 break;
1014 case NFS4_OPEN_CLAIM_PREVIOUS:
1015 case NFS4_OPEN_CLAIM_FH:
1016 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1017 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1018 p->o_arg.fh = NFS_FH(dentry->d_inode);
1019 }
1020 if (attrs != NULL && attrs->ia_valid != 0) {
1021 __u32 verf[2];
1022
1023 p->o_arg.u.attrs = &p->attrs;
1024 memcpy(&p->attrs, attrs, sizeof(p->attrs));
1025
1026 verf[0] = jiffies;
1027 verf[1] = current->pid;
1028 memcpy(p->o_arg.u.verifier.data, verf,
1029 sizeof(p->o_arg.u.verifier.data));
1030 }
1031 p->c_arg.fh = &p->o_res.fh;
1032 p->c_arg.stateid = &p->o_res.stateid;
1033 p->c_arg.seqid = p->o_arg.seqid;
1034 nfs4_init_opendata_res(p);
1035 kref_init(&p->kref);
1036 return p;
1037
1038err_free_label:
1039 nfs4_label_free(p->f_label);
1040err_free_p:
1041 kfree(p);
1042err:
1043 dput(parent);
1044 return NULL;
1045}
1046
1047static void nfs4_opendata_free(struct kref *kref)
1048{
1049 struct nfs4_opendata *p = container_of(kref,
1050 struct nfs4_opendata, kref);
1051 struct super_block *sb = p->dentry->d_sb;
1052
1053 nfs_free_seqid(p->o_arg.seqid);
1054 if (p->state != NULL)
1055 nfs4_put_open_state(p->state);
1056 nfs4_put_state_owner(p->owner);
1057
1058 nfs4_label_free(p->f_label);
1059
1060 dput(p->dir);
1061 dput(p->dentry);
1062 nfs_sb_deactive(sb);
1063 nfs_fattr_free_names(&p->f_attr);
1064 kfree(p);
1065}
1066
1067static void nfs4_opendata_put(struct nfs4_opendata *p)
1068{
1069 if (p != NULL)
1070 kref_put(&p->kref, nfs4_opendata_free);
1071}
1072
1073static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
1074{
1075 int ret;
1076
1077 ret = rpc_wait_for_completion_task(task);
1078 return ret;
1079}
1080
1081static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
1082{
1083 int ret = 0;
1084
1085 if (open_mode & (O_EXCL|O_TRUNC))
1086 goto out;
1087 switch (mode & (FMODE_READ|FMODE_WRITE)) {
1088 case FMODE_READ:
1089 ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1090 && state->n_rdonly != 0;
1091 break;
1092 case FMODE_WRITE:
1093 ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1094 && state->n_wronly != 0;
1095 break;
1096 case FMODE_READ|FMODE_WRITE:
1097 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1098 && state->n_rdwr != 0;
1099 }
1100out:
1101 return ret;
1102}
1103
1104static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
1105{
1106 if (delegation == NULL)
1107 return 0;
1108 if ((delegation->type & fmode) != fmode)
1109 return 0;
1110 if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1111 return 0;
1112 if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
1113 return 0;
1114 nfs_mark_delegation_referenced(delegation);
1115 return 1;
1116}
1117
1118static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1119{
1120 switch (fmode) {
1121 case FMODE_WRITE:
1122 state->n_wronly++;
1123 break;
1124 case FMODE_READ:
1125 state->n_rdonly++;
1126 break;
1127 case FMODE_READ|FMODE_WRITE:
1128 state->n_rdwr++;
1129 }
1130 nfs4_state_set_mode_locked(state, state->state | fmode);
1131}
1132
1133static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1134{
1135 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1136 nfs4_stateid_copy(&state->stateid, stateid);
1137 nfs4_stateid_copy(&state->open_stateid, stateid);
1138 set_bit(NFS_OPEN_STATE, &state->flags);
1139 switch (fmode) {
1140 case FMODE_READ:
1141 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1142 break;
1143 case FMODE_WRITE:
1144 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1145 break;
1146 case FMODE_READ|FMODE_WRITE:
1147 set_bit(NFS_O_RDWR_STATE, &state->flags);
1148 }
1149}
1150
1151static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1152{
1153 write_seqlock(&state->seqlock);
1154 nfs_set_open_stateid_locked(state, stateid, fmode);
1155 write_sequnlock(&state->seqlock);
1156}
1157
1158static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
1159{
1160 /*
1161 * Protect the call to nfs4_state_set_mode_locked and
1162 * serialise the stateid update
1163 */
1164 write_seqlock(&state->seqlock);
1165 if (deleg_stateid != NULL) {
1166 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1167 set_bit(NFS_DELEGATED_STATE, &state->flags);
1168 }
1169 if (open_stateid != NULL)
1170 nfs_set_open_stateid_locked(state, open_stateid, fmode);
1171 write_sequnlock(&state->seqlock);
1172 spin_lock(&state->owner->so_lock);
1173 update_open_stateflags(state, fmode);
1174 spin_unlock(&state->owner->so_lock);
1175}
1176
1177static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
1178{
1179 struct nfs_inode *nfsi = NFS_I(state->inode);
1180 struct nfs_delegation *deleg_cur;
1181 int ret = 0;
1182
1183 fmode &= (FMODE_READ|FMODE_WRITE);
1184
1185 rcu_read_lock();
1186 deleg_cur = rcu_dereference(nfsi->delegation);
1187 if (deleg_cur == NULL)
1188 goto no_delegation;
1189
1190 spin_lock(&deleg_cur->lock);
1191 if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1192 test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1193 (deleg_cur->type & fmode) != fmode)
1194 goto no_delegation_unlock;
1195
1196 if (delegation == NULL)
1197 delegation = &deleg_cur->stateid;
1198 else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1199 goto no_delegation_unlock;
1200
1201 nfs_mark_delegation_referenced(deleg_cur);
1202 __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1203 ret = 1;
1204no_delegation_unlock:
1205 spin_unlock(&deleg_cur->lock);
1206no_delegation:
1207 rcu_read_unlock();
1208
1209 if (!ret && open_stateid != NULL) {
1210 __update_open_stateid(state, open_stateid, NULL, fmode);
1211 ret = 1;
1212 }
1213
1214 return ret;
1215}
1216
1217
1218static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1219{
1220 struct nfs_delegation *delegation;
1221
1222 rcu_read_lock();
1223 delegation = rcu_dereference(NFS_I(inode)->delegation);
1224 if (delegation == NULL || (delegation->type & fmode) == fmode) {
1225 rcu_read_unlock();
1226 return;
1227 }
1228 rcu_read_unlock();
1229 nfs4_inode_return_delegation(inode);
1230}
1231
1232static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1233{
1234 struct nfs4_state *state = opendata->state;
1235 struct nfs_inode *nfsi = NFS_I(state->inode);
1236 struct nfs_delegation *delegation;
1237 int open_mode = opendata->o_arg.open_flags;
1238 fmode_t fmode = opendata->o_arg.fmode;
1239 nfs4_stateid stateid;
1240 int ret = -EAGAIN;
1241
1242 for (;;) {
1243 if (can_open_cached(state, fmode, open_mode)) {
1244 spin_lock(&state->owner->so_lock);
1245 if (can_open_cached(state, fmode, open_mode)) {
1246 update_open_stateflags(state, fmode);
1247 spin_unlock(&state->owner->so_lock);
1248 goto out_return_state;
1249 }
1250 spin_unlock(&state->owner->so_lock);
1251 }
1252 rcu_read_lock();
1253 delegation = rcu_dereference(nfsi->delegation);
1254 if (!can_open_delegated(delegation, fmode)) {
1255 rcu_read_unlock();
1256 break;
1257 }
1258 /* Save the delegation */
1259 nfs4_stateid_copy(&stateid, &delegation->stateid);
1260 rcu_read_unlock();
1261 nfs_release_seqid(opendata->o_arg.seqid);
1262 if (!opendata->is_recover) {
1263 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1264 if (ret != 0)
1265 goto out;
1266 }
1267 ret = -EAGAIN;
1268
1269 /* Try to update the stateid using the delegation */
1270 if (update_open_stateid(state, NULL, &stateid, fmode))
1271 goto out_return_state;
1272 }
1273out:
1274 return ERR_PTR(ret);
1275out_return_state:
1276 atomic_inc(&state->count);
1277 return state;
1278}
1279
1280static void
1281nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1282{
1283 struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1284 struct nfs_delegation *delegation;
1285 int delegation_flags = 0;
1286
1287 rcu_read_lock();
1288 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1289 if (delegation)
1290 delegation_flags = delegation->flags;
1291 rcu_read_unlock();
1292 if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1293 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1294 "returning a delegation for "
1295 "OPEN(CLAIM_DELEGATE_CUR)\n",
1296 clp->cl_hostname);
1297 } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1298 nfs_inode_set_delegation(state->inode,
1299 data->owner->so_cred,
1300 &data->o_res);
1301 else
1302 nfs_inode_reclaim_delegation(state->inode,
1303 data->owner->so_cred,
1304 &data->o_res);
1305}
1306
1307/*
1308 * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1309 * and update the nfs4_state.
1310 */
1311static struct nfs4_state *
1312_nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1313{
1314 struct inode *inode = data->state->inode;
1315 struct nfs4_state *state = data->state;
1316 int ret;
1317
1318 if (!data->rpc_done) {
1319 ret = data->rpc_status;
1320 goto err;
1321 }
1322
1323 ret = -ESTALE;
1324 if (!(data->f_attr.valid & NFS_ATTR_FATTR_TYPE) ||
1325 !(data->f_attr.valid & NFS_ATTR_FATTR_FILEID) ||
1326 !(data->f_attr.valid & NFS_ATTR_FATTR_CHANGE))
1327 goto err;
1328
1329 ret = -ENOMEM;
1330 state = nfs4_get_open_state(inode, data->owner);
1331 if (state == NULL)
1332 goto err;
1333
1334 ret = nfs_refresh_inode(inode, &data->f_attr);
1335 if (ret)
1336 goto err;
1337
1338 nfs_setsecurity(inode, &data->f_attr, data->f_label);
1339
1340 if (data->o_res.delegation_type != 0)
1341 nfs4_opendata_check_deleg(data, state);
1342 update_open_stateid(state, &data->o_res.stateid, NULL,
1343 data->o_arg.fmode);
1344
1345 return state;
1346err:
1347 return ERR_PTR(ret);
1348
1349}
1350
1351static struct nfs4_state *
1352_nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1353{
1354 struct inode *inode;
1355 struct nfs4_state *state = NULL;
1356 int ret;
1357
1358 if (!data->rpc_done) {
1359 state = nfs4_try_open_cached(data);
1360 goto out;
1361 }
1362
1363 ret = -EAGAIN;
1364 if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1365 goto err;
1366 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr, data->f_label);
1367 ret = PTR_ERR(inode);
1368 if (IS_ERR(inode))
1369 goto err;
1370 ret = -ENOMEM;
1371 state = nfs4_get_open_state(inode, data->owner);
1372 if (state == NULL)
1373 goto err_put_inode;
1374 if (data->o_res.delegation_type != 0)
1375 nfs4_opendata_check_deleg(data, state);
1376 update_open_stateid(state, &data->o_res.stateid, NULL,
1377 data->o_arg.fmode);
1378 iput(inode);
1379out:
1380 nfs_release_seqid(data->o_arg.seqid);
1381 return state;
1382err_put_inode:
1383 iput(inode);
1384err:
1385 return ERR_PTR(ret);
1386}
1387
1388static struct nfs4_state *
1389nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1390{
1391 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1392 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1393 return _nfs4_opendata_to_nfs4_state(data);
1394}
1395
1396static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1397{
1398 struct nfs_inode *nfsi = NFS_I(state->inode);
1399 struct nfs_open_context *ctx;
1400
1401 spin_lock(&state->inode->i_lock);
1402 list_for_each_entry(ctx, &nfsi->open_files, list) {
1403 if (ctx->state != state)
1404 continue;
1405 get_nfs_open_context(ctx);
1406 spin_unlock(&state->inode->i_lock);
1407 return ctx;
1408 }
1409 spin_unlock(&state->inode->i_lock);
1410 return ERR_PTR(-ENOENT);
1411}
1412
1413static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
1414 struct nfs4_state *state, enum open_claim_type4 claim)
1415{
1416 struct nfs4_opendata *opendata;
1417
1418 opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
1419 NULL, NULL, claim, GFP_NOFS);
1420 if (opendata == NULL)
1421 return ERR_PTR(-ENOMEM);
1422 opendata->state = state;
1423 atomic_inc(&state->count);
1424 return opendata;
1425}
1426
1427static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1428{
1429 struct nfs4_state *newstate;
1430 int ret;
1431
1432 opendata->o_arg.open_flags = 0;
1433 opendata->o_arg.fmode = fmode;
1434 memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1435 memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1436 nfs4_init_opendata_res(opendata);
1437 ret = _nfs4_recover_proc_open(opendata);
1438 if (ret != 0)
1439 return ret;
1440 newstate = nfs4_opendata_to_nfs4_state(opendata);
1441 if (IS_ERR(newstate))
1442 return PTR_ERR(newstate);
1443 nfs4_close_state(newstate, fmode);
1444 *res = newstate;
1445 return 0;
1446}
1447
1448static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1449{
1450 struct nfs4_state *newstate;
1451 int ret;
1452
1453 /* memory barrier prior to reading state->n_* */
1454 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1455 clear_bit(NFS_OPEN_STATE, &state->flags);
1456 smp_rmb();
1457 if (state->n_rdwr != 0) {
1458 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1459 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1460 if (ret != 0)
1461 return ret;
1462 if (newstate != state)
1463 return -ESTALE;
1464 }
1465 if (state->n_wronly != 0) {
1466 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1467 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1468 if (ret != 0)
1469 return ret;
1470 if (newstate != state)
1471 return -ESTALE;
1472 }
1473 if (state->n_rdonly != 0) {
1474 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1475 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1476 if (ret != 0)
1477 return ret;
1478 if (newstate != state)
1479 return -ESTALE;
1480 }
1481 /*
1482 * We may have performed cached opens for all three recoveries.
1483 * Check if we need to update the current stateid.
1484 */
1485 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1486 !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1487 write_seqlock(&state->seqlock);
1488 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1489 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1490 write_sequnlock(&state->seqlock);
1491 }
1492 return 0;
1493}
1494
1495/*
1496 * OPEN_RECLAIM:
1497 * reclaim state on the server after a reboot.
1498 */
1499static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1500{
1501 struct nfs_delegation *delegation;
1502 struct nfs4_opendata *opendata;
1503 fmode_t delegation_type = 0;
1504 int status;
1505
1506 opendata = nfs4_open_recoverdata_alloc(ctx, state,
1507 NFS4_OPEN_CLAIM_PREVIOUS);
1508 if (IS_ERR(opendata))
1509 return PTR_ERR(opendata);
1510 rcu_read_lock();
1511 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1512 if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1513 delegation_type = delegation->type;
1514 rcu_read_unlock();
1515 opendata->o_arg.u.delegation_type = delegation_type;
1516 status = nfs4_open_recover(opendata, state);
1517 nfs4_opendata_put(opendata);
1518 return status;
1519}
1520
1521static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1522{
1523 struct nfs_server *server = NFS_SERVER(state->inode);
1524 struct nfs4_exception exception = { };
1525 int err;
1526 do {
1527 err = _nfs4_do_open_reclaim(ctx, state);
1528 trace_nfs4_open_reclaim(ctx, 0, err);
1529 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1530 continue;
1531 if (err != -NFS4ERR_DELAY)
1532 break;
1533 nfs4_handle_exception(server, err, &exception);
1534 } while (exception.retry);
1535 return err;
1536}
1537
1538static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1539{
1540 struct nfs_open_context *ctx;
1541 int ret;
1542
1543 ctx = nfs4_state_find_open_context(state);
1544 if (IS_ERR(ctx))
1545 return -EAGAIN;
1546 ret = nfs4_do_open_reclaim(ctx, state);
1547 put_nfs_open_context(ctx);
1548 return ret;
1549}
1550
1551static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, int err)
1552{
1553 switch (err) {
1554 default:
1555 printk(KERN_ERR "NFS: %s: unhandled error "
1556 "%d.\n", __func__, err);
1557 case 0:
1558 case -ENOENT:
1559 case -ESTALE:
1560 break;
1561 case -NFS4ERR_BADSESSION:
1562 case -NFS4ERR_BADSLOT:
1563 case -NFS4ERR_BAD_HIGH_SLOT:
1564 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1565 case -NFS4ERR_DEADSESSION:
1566 set_bit(NFS_DELEGATED_STATE, &state->flags);
1567 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1568 return -EAGAIN;
1569 case -NFS4ERR_STALE_CLIENTID:
1570 case -NFS4ERR_STALE_STATEID:
1571 set_bit(NFS_DELEGATED_STATE, &state->flags);
1572 case -NFS4ERR_EXPIRED:
1573 /* Don't recall a delegation if it was lost */
1574 nfs4_schedule_lease_recovery(server->nfs_client);
1575 return -EAGAIN;
1576 case -NFS4ERR_DELEG_REVOKED:
1577 case -NFS4ERR_ADMIN_REVOKED:
1578 case -NFS4ERR_BAD_STATEID:
1579 case -NFS4ERR_OPENMODE:
1580 nfs_inode_find_state_and_recover(state->inode,
1581 stateid);
1582 nfs4_schedule_stateid_recovery(server, state);
1583 return 0;
1584 case -NFS4ERR_DELAY:
1585 case -NFS4ERR_GRACE:
1586 set_bit(NFS_DELEGATED_STATE, &state->flags);
1587 ssleep(1);
1588 return -EAGAIN;
1589 case -ENOMEM:
1590 case -NFS4ERR_DENIED:
1591 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1592 return 0;
1593 }
1594 return err;
1595}
1596
1597int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1598{
1599 struct nfs_server *server = NFS_SERVER(state->inode);
1600 struct nfs4_opendata *opendata;
1601 int err;
1602
1603 opendata = nfs4_open_recoverdata_alloc(ctx, state,
1604 NFS4_OPEN_CLAIM_DELEG_CUR_FH);
1605 if (IS_ERR(opendata))
1606 return PTR_ERR(opendata);
1607 nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1608 err = nfs4_open_recover(opendata, state);
1609 nfs4_opendata_put(opendata);
1610 return nfs4_handle_delegation_recall_error(server, state, stateid, err);
1611}
1612
1613static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
1614{
1615 struct nfs4_opendata *data = calldata;
1616
1617 nfs40_setup_sequence(data->o_arg.server, &data->o_arg.seq_args,
1618 &data->o_res.seq_res, task);
1619}
1620
1621static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1622{
1623 struct nfs4_opendata *data = calldata;
1624
1625 nfs40_sequence_done(task, &data->o_res.seq_res);
1626
1627 data->rpc_status = task->tk_status;
1628 if (data->rpc_status == 0) {
1629 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1630 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1631 renew_lease(data->o_res.server, data->timestamp);
1632 data->rpc_done = 1;
1633 }
1634}
1635
1636static void nfs4_open_confirm_release(void *calldata)
1637{
1638 struct nfs4_opendata *data = calldata;
1639 struct nfs4_state *state = NULL;
1640
1641 /* If this request hasn't been cancelled, do nothing */
1642 if (data->cancelled == 0)
1643 goto out_free;
1644 /* In case of error, no cleanup! */
1645 if (!data->rpc_done)
1646 goto out_free;
1647 state = nfs4_opendata_to_nfs4_state(data);
1648 if (!IS_ERR(state))
1649 nfs4_close_state(state, data->o_arg.fmode);
1650out_free:
1651 nfs4_opendata_put(data);
1652}
1653
1654static const struct rpc_call_ops nfs4_open_confirm_ops = {
1655 .rpc_call_prepare = nfs4_open_confirm_prepare,
1656 .rpc_call_done = nfs4_open_confirm_done,
1657 .rpc_release = nfs4_open_confirm_release,
1658};
1659
1660/*
1661 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1662 */
1663static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1664{
1665 struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1666 struct rpc_task *task;
1667 struct rpc_message msg = {
1668 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1669 .rpc_argp = &data->c_arg,
1670 .rpc_resp = &data->c_res,
1671 .rpc_cred = data->owner->so_cred,
1672 };
1673 struct rpc_task_setup task_setup_data = {
1674 .rpc_client = server->client,
1675 .rpc_message = &msg,
1676 .callback_ops = &nfs4_open_confirm_ops,
1677 .callback_data = data,
1678 .workqueue = nfsiod_workqueue,
1679 .flags = RPC_TASK_ASYNC,
1680 };
1681 int status;
1682
1683 nfs4_init_sequence(&data->o_arg.seq_args, &data->o_res.seq_res, 1);
1684 kref_get(&data->kref);
1685 data->rpc_done = 0;
1686 data->rpc_status = 0;
1687 data->timestamp = jiffies;
1688 task = rpc_run_task(&task_setup_data);
1689 if (IS_ERR(task))
1690 return PTR_ERR(task);
1691 status = nfs4_wait_for_completion_rpc_task(task);
1692 if (status != 0) {
1693 data->cancelled = 1;
1694 smp_wmb();
1695 } else
1696 status = data->rpc_status;
1697 rpc_put_task(task);
1698 return status;
1699}
1700
1701static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1702{
1703 struct nfs4_opendata *data = calldata;
1704 struct nfs4_state_owner *sp = data->owner;
1705 struct nfs_client *clp = sp->so_server->nfs_client;
1706
1707 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1708 goto out_wait;
1709 /*
1710 * Check if we still need to send an OPEN call, or if we can use
1711 * a delegation instead.
1712 */
1713 if (data->state != NULL) {
1714 struct nfs_delegation *delegation;
1715
1716 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1717 goto out_no_action;
1718 rcu_read_lock();
1719 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1720 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1721 data->o_arg.claim != NFS4_OPEN_CLAIM_DELEG_CUR_FH &&
1722 can_open_delegated(delegation, data->o_arg.fmode))
1723 goto unlock_no_action;
1724 rcu_read_unlock();
1725 }
1726 /* Update client id. */
1727 data->o_arg.clientid = clp->cl_clientid;
1728 switch (data->o_arg.claim) {
1729 case NFS4_OPEN_CLAIM_PREVIOUS:
1730 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1731 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1732 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1733 case NFS4_OPEN_CLAIM_FH:
1734 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1735 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1736 }
1737 data->timestamp = jiffies;
1738 if (nfs4_setup_sequence(data->o_arg.server,
1739 &data->o_arg.seq_args,
1740 &data->o_res.seq_res,
1741 task) != 0)
1742 nfs_release_seqid(data->o_arg.seqid);
1743
1744 /* Set the create mode (note dependency on the session type) */
1745 data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
1746 if (data->o_arg.open_flags & O_EXCL) {
1747 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
1748 if (nfs4_has_persistent_session(clp))
1749 data->o_arg.createmode = NFS4_CREATE_GUARDED;
1750 else if (clp->cl_mvops->minor_version > 0)
1751 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
1752 }
1753 return;
1754unlock_no_action:
1755 rcu_read_unlock();
1756out_no_action:
1757 task->tk_action = NULL;
1758out_wait:
1759 nfs4_sequence_done(task, &data->o_res.seq_res);
1760}
1761
1762static void nfs4_open_done(struct rpc_task *task, void *calldata)
1763{
1764 struct nfs4_opendata *data = calldata;
1765
1766 data->rpc_status = task->tk_status;
1767
1768 if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1769 return;
1770
1771 if (task->tk_status == 0) {
1772 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1773 switch (data->o_res.f_attr->mode & S_IFMT) {
1774 case S_IFREG:
1775 break;
1776 case S_IFLNK:
1777 data->rpc_status = -ELOOP;
1778 break;
1779 case S_IFDIR:
1780 data->rpc_status = -EISDIR;
1781 break;
1782 default:
1783 data->rpc_status = -ENOTDIR;
1784 }
1785 }
1786 renew_lease(data->o_res.server, data->timestamp);
1787 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1788 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1789 }
1790 data->rpc_done = 1;
1791}
1792
1793static void nfs4_open_release(void *calldata)
1794{
1795 struct nfs4_opendata *data = calldata;
1796 struct nfs4_state *state = NULL;
1797
1798 /* If this request hasn't been cancelled, do nothing */
1799 if (data->cancelled == 0)
1800 goto out_free;
1801 /* In case of error, no cleanup! */
1802 if (data->rpc_status != 0 || !data->rpc_done)
1803 goto out_free;
1804 /* In case we need an open_confirm, no cleanup! */
1805 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1806 goto out_free;
1807 state = nfs4_opendata_to_nfs4_state(data);
1808 if (!IS_ERR(state))
1809 nfs4_close_state(state, data->o_arg.fmode);
1810out_free:
1811 nfs4_opendata_put(data);
1812}
1813
1814static const struct rpc_call_ops nfs4_open_ops = {
1815 .rpc_call_prepare = nfs4_open_prepare,
1816 .rpc_call_done = nfs4_open_done,
1817 .rpc_release = nfs4_open_release,
1818};
1819
1820static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1821{
1822 struct inode *dir = data->dir->d_inode;
1823 struct nfs_server *server = NFS_SERVER(dir);
1824 struct nfs_openargs *o_arg = &data->o_arg;
1825 struct nfs_openres *o_res = &data->o_res;
1826 struct rpc_task *task;
1827 struct rpc_message msg = {
1828 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1829 .rpc_argp = o_arg,
1830 .rpc_resp = o_res,
1831 .rpc_cred = data->owner->so_cred,
1832 };
1833 struct rpc_task_setup task_setup_data = {
1834 .rpc_client = server->client,
1835 .rpc_message = &msg,
1836 .callback_ops = &nfs4_open_ops,
1837 .callback_data = data,
1838 .workqueue = nfsiod_workqueue,
1839 .flags = RPC_TASK_ASYNC,
1840 };
1841 int status;
1842
1843 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1844 kref_get(&data->kref);
1845 data->rpc_done = 0;
1846 data->rpc_status = 0;
1847 data->cancelled = 0;
1848 data->is_recover = 0;
1849 if (isrecover) {
1850 nfs4_set_sequence_privileged(&o_arg->seq_args);
1851 data->is_recover = 1;
1852 }
1853 task = rpc_run_task(&task_setup_data);
1854 if (IS_ERR(task))
1855 return PTR_ERR(task);
1856 status = nfs4_wait_for_completion_rpc_task(task);
1857 if (status != 0) {
1858 data->cancelled = 1;
1859 smp_wmb();
1860 } else
1861 status = data->rpc_status;
1862 rpc_put_task(task);
1863
1864 return status;
1865}
1866
1867static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1868{
1869 struct inode *dir = data->dir->d_inode;
1870 struct nfs_openres *o_res = &data->o_res;
1871 int status;
1872
1873 status = nfs4_run_open_task(data, 1);
1874 if (status != 0 || !data->rpc_done)
1875 return status;
1876
1877 nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1878
1879 if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1880 status = _nfs4_proc_open_confirm(data);
1881 if (status != 0)
1882 return status;
1883 }
1884
1885 return status;
1886}
1887
1888static int nfs4_opendata_access(struct rpc_cred *cred,
1889 struct nfs4_opendata *opendata,
1890 struct nfs4_state *state, fmode_t fmode,
1891 int openflags)
1892{
1893 struct nfs_access_entry cache;
1894 u32 mask;
1895
1896 /* access call failed or for some reason the server doesn't
1897 * support any access modes -- defer access call until later */
1898 if (opendata->o_res.access_supported == 0)
1899 return 0;
1900
1901 mask = 0;
1902 /* don't check MAY_WRITE - a newly created file may not have
1903 * write mode bits, but POSIX allows the creating process to write.
1904 * use openflags to check for exec, because fmode won't
1905 * always have FMODE_EXEC set when file open for exec. */
1906 if (openflags & __FMODE_EXEC) {
1907 /* ONLY check for exec rights */
1908 mask = MAY_EXEC;
1909 } else if (fmode & FMODE_READ)
1910 mask = MAY_READ;
1911
1912 cache.cred = cred;
1913 cache.jiffies = jiffies;
1914 nfs_access_set_mask(&cache, opendata->o_res.access_result);
1915 nfs_access_add_cache(state->inode, &cache);
1916
1917 if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
1918 return 0;
1919
1920 /* even though OPEN succeeded, access is denied. Close the file */
1921 nfs4_close_state(state, fmode);
1922 return -EACCES;
1923}
1924
1925/*
1926 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1927 */
1928static int _nfs4_proc_open(struct nfs4_opendata *data)
1929{
1930 struct inode *dir = data->dir->d_inode;
1931 struct nfs_server *server = NFS_SERVER(dir);
1932 struct nfs_openargs *o_arg = &data->o_arg;
1933 struct nfs_openres *o_res = &data->o_res;
1934 int status;
1935
1936 status = nfs4_run_open_task(data, 0);
1937 if (!data->rpc_done)
1938 return status;
1939 if (status != 0) {
1940 if (status == -NFS4ERR_BADNAME &&
1941 !(o_arg->open_flags & O_CREAT))
1942 return -ENOENT;
1943 return status;
1944 }
1945
1946 nfs_fattr_map_and_free_names(server, &data->f_attr);
1947
1948 if (o_arg->open_flags & O_CREAT)
1949 update_changeattr(dir, &o_res->cinfo);
1950 if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1951 server->caps &= ~NFS_CAP_POSIX_LOCK;
1952 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1953 status = _nfs4_proc_open_confirm(data);
1954 if (status != 0)
1955 return status;
1956 }
1957 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1958 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, o_res->f_label);
1959 return 0;
1960}
1961
1962static int nfs4_recover_expired_lease(struct nfs_server *server)
1963{
1964 return nfs4_client_recover_expired_lease(server->nfs_client);
1965}
1966
1967/*
1968 * OPEN_EXPIRED:
1969 * reclaim state on the server after a network partition.
1970 * Assumes caller holds the appropriate lock
1971 */
1972static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1973{
1974 struct nfs4_opendata *opendata;
1975 int ret;
1976
1977 opendata = nfs4_open_recoverdata_alloc(ctx, state,
1978 NFS4_OPEN_CLAIM_FH);
1979 if (IS_ERR(opendata))
1980 return PTR_ERR(opendata);
1981 ret = nfs4_open_recover(opendata, state);
1982 if (ret == -ESTALE)
1983 d_drop(ctx->dentry);
1984 nfs4_opendata_put(opendata);
1985 return ret;
1986}
1987
1988static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1989{
1990 struct nfs_server *server = NFS_SERVER(state->inode);
1991 struct nfs4_exception exception = { };
1992 int err;
1993
1994 do {
1995 err = _nfs4_open_expired(ctx, state);
1996 trace_nfs4_open_expired(ctx, 0, err);
1997 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1998 continue;
1999 switch (err) {
2000 default:
2001 goto out;
2002 case -NFS4ERR_GRACE:
2003 case -NFS4ERR_DELAY:
2004 nfs4_handle_exception(server, err, &exception);
2005 err = 0;
2006 }
2007 } while (exception.retry);
2008out:
2009 return err;
2010}
2011
2012static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2013{
2014 struct nfs_open_context *ctx;
2015 int ret;
2016
2017 ctx = nfs4_state_find_open_context(state);
2018 if (IS_ERR(ctx))
2019 return -EAGAIN;
2020 ret = nfs4_do_open_expired(ctx, state);
2021 put_nfs_open_context(ctx);
2022 return ret;
2023}
2024
2025#if defined(CONFIG_NFS_V4_1)
2026static void nfs41_clear_delegation_stateid(struct nfs4_state *state)
2027{
2028 struct nfs_server *server = NFS_SERVER(state->inode);
2029 nfs4_stateid *stateid = &state->stateid;
2030 struct nfs_delegation *delegation;
2031 struct rpc_cred *cred = NULL;
2032 int status = -NFS4ERR_BAD_STATEID;
2033
2034 /* If a state reset has been done, test_stateid is unneeded */
2035 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
2036 return;
2037
2038 /* Get the delegation credential for use by test/free_stateid */
2039 rcu_read_lock();
2040 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2041 if (delegation != NULL &&
2042 nfs4_stateid_match(&delegation->stateid, stateid)) {
2043 cred = get_rpccred(delegation->cred);
2044 rcu_read_unlock();
2045 status = nfs41_test_stateid(server, stateid, cred);
2046 trace_nfs4_test_delegation_stateid(state, NULL, status);
2047 } else
2048 rcu_read_unlock();
2049
2050 if (status != NFS_OK) {
2051 /* Free the stateid unless the server explicitly
2052 * informs us the stateid is unrecognized. */
2053 if (status != -NFS4ERR_BAD_STATEID)
2054 nfs41_free_stateid(server, stateid, cred);
2055 nfs_remove_bad_delegation(state->inode);
2056
2057 write_seqlock(&state->seqlock);
2058 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2059 write_sequnlock(&state->seqlock);
2060 clear_bit(NFS_DELEGATED_STATE, &state->flags);
2061 }
2062
2063 if (cred != NULL)
2064 put_rpccred(cred);
2065}
2066
2067/**
2068 * nfs41_check_open_stateid - possibly free an open stateid
2069 *
2070 * @state: NFSv4 state for an inode
2071 *
2072 * Returns NFS_OK if recovery for this stateid is now finished.
2073 * Otherwise a negative NFS4ERR value is returned.
2074 */
2075static int nfs41_check_open_stateid(struct nfs4_state *state)
2076{
2077 struct nfs_server *server = NFS_SERVER(state->inode);
2078 nfs4_stateid *stateid = &state->open_stateid;
2079 struct rpc_cred *cred = state->owner->so_cred;
2080 int status;
2081
2082 /* If a state reset has been done, test_stateid is unneeded */
2083 if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
2084 (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
2085 (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
2086 return -NFS4ERR_BAD_STATEID;
2087
2088 status = nfs41_test_stateid(server, stateid, cred);
2089 trace_nfs4_test_open_stateid(state, NULL, status);
2090 if (status != NFS_OK) {
2091 /* Free the stateid unless the server explicitly
2092 * informs us the stateid is unrecognized. */
2093 if (status != -NFS4ERR_BAD_STATEID)
2094 nfs41_free_stateid(server, stateid, cred);
2095
2096 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2097 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2098 clear_bit(NFS_O_RDWR_STATE, &state->flags);
2099 clear_bit(NFS_OPEN_STATE, &state->flags);
2100 }
2101 return status;
2102}
2103
2104static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2105{
2106 int status;
2107
2108 nfs41_clear_delegation_stateid(state);
2109 status = nfs41_check_open_stateid(state);
2110 if (status != NFS_OK)
2111 status = nfs4_open_expired(sp, state);
2112 return status;
2113}
2114#endif
2115
2116/*
2117 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2118 * fields corresponding to attributes that were used to store the verifier.
2119 * Make sure we clobber those fields in the later setattr call
2120 */
2121static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
2122{
2123 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
2124 !(sattr->ia_valid & ATTR_ATIME_SET))
2125 sattr->ia_valid |= ATTR_ATIME;
2126
2127 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
2128 !(sattr->ia_valid & ATTR_MTIME_SET))
2129 sattr->ia_valid |= ATTR_MTIME;
2130}
2131
2132static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
2133 fmode_t fmode,
2134 int flags,
2135 struct nfs_open_context *ctx)
2136{
2137 struct nfs4_state_owner *sp = opendata->owner;
2138 struct nfs_server *server = sp->so_server;
2139 struct dentry *dentry;
2140 struct nfs4_state *state;
2141 unsigned int seq;
2142 int ret;
2143
2144 seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
2145
2146 ret = _nfs4_proc_open(opendata);
2147 if (ret != 0)
2148 goto out;
2149
2150 state = nfs4_opendata_to_nfs4_state(opendata);
2151 ret = PTR_ERR(state);
2152 if (IS_ERR(state))
2153 goto out;
2154 if (server->caps & NFS_CAP_POSIX_LOCK)
2155 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
2156
2157 dentry = opendata->dentry;
2158 if (dentry->d_inode == NULL) {
2159 /* FIXME: Is this d_drop() ever needed? */
2160 d_drop(dentry);
2161 dentry = d_add_unique(dentry, igrab(state->inode));
2162 if (dentry == NULL) {
2163 dentry = opendata->dentry;
2164 } else if (dentry != ctx->dentry) {
2165 dput(ctx->dentry);
2166 ctx->dentry = dget(dentry);
2167 }
2168 nfs_set_verifier(dentry,
2169 nfs_save_change_attribute(opendata->dir->d_inode));
2170 }
2171
2172 ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
2173 if (ret != 0)
2174 goto out;
2175
2176 ctx->state = state;
2177 if (dentry->d_inode == state->inode) {
2178 nfs_inode_attach_open_context(ctx);
2179 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
2180 nfs4_schedule_stateid_recovery(server, state);
2181 }
2182out:
2183 return ret;
2184}
2185
2186/*
2187 * Returns a referenced nfs4_state
2188 */
2189static int _nfs4_do_open(struct inode *dir,
2190 struct nfs_open_context *ctx,
2191 int flags,
2192 struct iattr *sattr,
2193 struct nfs4_label *label)
2194{
2195 struct nfs4_state_owner *sp;
2196 struct nfs4_state *state = NULL;
2197 struct nfs_server *server = NFS_SERVER(dir);
2198 struct nfs4_opendata *opendata;
2199 struct dentry *dentry = ctx->dentry;
2200 struct rpc_cred *cred = ctx->cred;
2201 struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
2202 fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
2203 enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
2204 struct nfs4_label *olabel = NULL;
2205 int status;
2206
2207 /* Protect against reboot recovery conflicts */
2208 status = -ENOMEM;
2209 sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
2210 if (sp == NULL) {
2211 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
2212 goto out_err;
2213 }
2214 status = nfs4_recover_expired_lease(server);
2215 if (status != 0)
2216 goto err_put_state_owner;
2217 if (dentry->d_inode != NULL)
2218 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
2219 status = -ENOMEM;
2220 if (dentry->d_inode)
2221 claim = NFS4_OPEN_CLAIM_FH;
2222 opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr,
2223 label, claim, GFP_KERNEL);
2224 if (opendata == NULL)
2225 goto err_put_state_owner;
2226
2227 if (label) {
2228 olabel = nfs4_label_alloc(server, GFP_KERNEL);
2229 if (IS_ERR(olabel)) {
2230 status = PTR_ERR(olabel);
2231 goto err_opendata_put;
2232 }
2233 }
2234
2235 if (ctx_th && server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
2236 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
2237 if (!opendata->f_attr.mdsthreshold)
2238 goto err_free_label;
2239 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
2240 }
2241 if (dentry->d_inode != NULL)
2242 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
2243
2244 status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx);
2245 if (status != 0)
2246 goto err_free_label;
2247 state = ctx->state;
2248
2249 if ((opendata->o_arg.open_flags & O_EXCL) &&
2250 (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
2251 nfs4_exclusive_attrset(opendata, sattr);
2252
2253 nfs_fattr_init(opendata->o_res.f_attr);
2254 status = nfs4_do_setattr(state->inode, cred,
2255 opendata->o_res.f_attr, sattr,
2256 state, label, olabel);
2257 if (status == 0) {
2258 nfs_setattr_update_inode(state->inode, sattr);
2259 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
2260 nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel);
2261 }
2262 }
2263
2264 if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server))
2265 *ctx_th = opendata->f_attr.mdsthreshold;
2266 else
2267 kfree(opendata->f_attr.mdsthreshold);
2268 opendata->f_attr.mdsthreshold = NULL;
2269
2270 nfs4_label_free(olabel);
2271
2272 nfs4_opendata_put(opendata);
2273 nfs4_put_state_owner(sp);
2274 return 0;
2275err_free_label:
2276 nfs4_label_free(olabel);
2277err_opendata_put:
2278 kfree(opendata->f_attr.mdsthreshold);
2279 nfs4_opendata_put(opendata);
2280err_put_state_owner:
2281 nfs4_put_state_owner(sp);
2282out_err:
2283 return status;
2284}
2285
2286
2287static struct nfs4_state *nfs4_do_open(struct inode *dir,
2288 struct nfs_open_context *ctx,
2289 int flags,
2290 struct iattr *sattr,
2291 struct nfs4_label *label)
2292{
2293 struct nfs_server *server = NFS_SERVER(dir);
2294 struct nfs4_exception exception = { };
2295 struct nfs4_state *res;
2296 int status;
2297
2298 do {
2299 status = _nfs4_do_open(dir, ctx, flags, sattr, label);
2300 res = ctx->state;
2301 trace_nfs4_open_file(ctx, flags, status);
2302 if (status == 0)
2303 break;
2304 /* NOTE: BAD_SEQID means the server and client disagree about the
2305 * book-keeping w.r.t. state-changing operations
2306 * (OPEN/CLOSE/LOCK/LOCKU...)
2307 * It is actually a sign of a bug on the client or on the server.
2308 *
2309 * If we receive a BAD_SEQID error in the particular case of
2310 * doing an OPEN, we assume that nfs_increment_open_seqid() will
2311 * have unhashed the old state_owner for us, and that we can
2312 * therefore safely retry using a new one. We should still warn
2313 * the user though...
2314 */
2315 if (status == -NFS4ERR_BAD_SEQID) {
2316 pr_warn_ratelimited("NFS: v4 server %s "
2317 " returned a bad sequence-id error!\n",
2318 NFS_SERVER(dir)->nfs_client->cl_hostname);
2319 exception.retry = 1;
2320 continue;
2321 }
2322 /*
2323 * BAD_STATEID on OPEN means that the server cancelled our
2324 * state before it received the OPEN_CONFIRM.
2325 * Recover by retrying the request as per the discussion
2326 * on Page 181 of RFC3530.
2327 */
2328 if (status == -NFS4ERR_BAD_STATEID) {
2329 exception.retry = 1;
2330 continue;
2331 }
2332 if (status == -EAGAIN) {
2333 /* We must have found a delegation */
2334 exception.retry = 1;
2335 continue;
2336 }
2337 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
2338 continue;
2339 res = ERR_PTR(nfs4_handle_exception(server,
2340 status, &exception));
2341 } while (exception.retry);
2342 return res;
2343}
2344
2345static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2346 struct nfs_fattr *fattr, struct iattr *sattr,
2347 struct nfs4_state *state, struct nfs4_label *ilabel,
2348 struct nfs4_label *olabel)
2349{
2350 struct nfs_server *server = NFS_SERVER(inode);
2351 struct nfs_setattrargs arg = {
2352 .fh = NFS_FH(inode),
2353 .iap = sattr,
2354 .server = server,
2355 .bitmask = server->attr_bitmask,
2356 .label = ilabel,
2357 };
2358 struct nfs_setattrres res = {
2359 .fattr = fattr,
2360 .label = olabel,
2361 .server = server,
2362 };
2363 struct rpc_message msg = {
2364 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2365 .rpc_argp = &arg,
2366 .rpc_resp = &res,
2367 .rpc_cred = cred,
2368 };
2369 unsigned long timestamp = jiffies;
2370 fmode_t fmode;
2371 bool truncate;
2372 int status;
2373
2374 arg.bitmask = nfs4_bitmask(server, ilabel);
2375 if (ilabel)
2376 arg.bitmask = nfs4_bitmask(server, olabel);
2377
2378 nfs_fattr_init(fattr);
2379
2380 /* Servers should only apply open mode checks for file size changes */
2381 truncate = (sattr->ia_valid & ATTR_SIZE) ? true : false;
2382 fmode = truncate ? FMODE_WRITE : FMODE_READ;
2383
2384 if (nfs4_copy_delegation_stateid(&arg.stateid, inode, fmode)) {
2385 /* Use that stateid */
2386 } else if (truncate && state != NULL && nfs4_valid_open_stateid(state)) {
2387 struct nfs_lockowner lockowner = {
2388 .l_owner = current->files,
2389 .l_pid = current->tgid,
2390 };
2391 nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2392 &lockowner);
2393 } else
2394 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2395
2396 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2397 if (status == 0 && state != NULL)
2398 renew_lease(server, timestamp);
2399 return status;
2400}
2401
2402static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2403 struct nfs_fattr *fattr, struct iattr *sattr,
2404 struct nfs4_state *state, struct nfs4_label *ilabel,
2405 struct nfs4_label *olabel)
2406{
2407 struct nfs_server *server = NFS_SERVER(inode);
2408 struct nfs4_exception exception = {
2409 .state = state,
2410 .inode = inode,
2411 };
2412 int err;
2413 do {
2414 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state, ilabel, olabel);
2415 trace_nfs4_setattr(inode, err);
2416 switch (err) {
2417 case -NFS4ERR_OPENMODE:
2418 if (!(sattr->ia_valid & ATTR_SIZE)) {
2419 pr_warn_once("NFSv4: server %s is incorrectly "
2420 "applying open mode checks to "
2421 "a SETATTR that is not "
2422 "changing file size.\n",
2423 server->nfs_client->cl_hostname);
2424 }
2425 if (state && !(state->state & FMODE_WRITE)) {
2426 err = -EBADF;
2427 if (sattr->ia_valid & ATTR_OPEN)
2428 err = -EACCES;
2429 goto out;
2430 }
2431 }
2432 err = nfs4_handle_exception(server, err, &exception);
2433 } while (exception.retry);
2434out:
2435 return err;
2436}
2437
2438struct nfs4_closedata {
2439 struct inode *inode;
2440 struct nfs4_state *state;
2441 struct nfs_closeargs arg;
2442 struct nfs_closeres res;
2443 struct nfs_fattr fattr;
2444 unsigned long timestamp;
2445 bool roc;
2446 u32 roc_barrier;
2447};
2448
2449static void nfs4_free_closedata(void *data)
2450{
2451 struct nfs4_closedata *calldata = data;
2452 struct nfs4_state_owner *sp = calldata->state->owner;
2453 struct super_block *sb = calldata->state->inode->i_sb;
2454
2455 if (calldata->roc)
2456 pnfs_roc_release(calldata->state->inode);
2457 nfs4_put_open_state(calldata->state);
2458 nfs_free_seqid(calldata->arg.seqid);
2459 nfs4_put_state_owner(sp);
2460 nfs_sb_deactive(sb);
2461 kfree(calldata);
2462}
2463
2464static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
2465 fmode_t fmode)
2466{
2467 spin_lock(&state->owner->so_lock);
2468 clear_bit(NFS_O_RDWR_STATE, &state->flags);
2469 switch (fmode & (FMODE_READ|FMODE_WRITE)) {
2470 case FMODE_WRITE:
2471 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2472 break;
2473 case FMODE_READ:
2474 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2475 break;
2476 case 0:
2477 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2478 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2479 clear_bit(NFS_OPEN_STATE, &state->flags);
2480 }
2481 spin_unlock(&state->owner->so_lock);
2482}
2483
2484static void nfs4_close_done(struct rpc_task *task, void *data)
2485{
2486 struct nfs4_closedata *calldata = data;
2487 struct nfs4_state *state = calldata->state;
2488 struct nfs_server *server = NFS_SERVER(calldata->inode);
2489
2490 dprintk("%s: begin!\n", __func__);
2491 if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2492 return;
2493 trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
2494 /* hmm. we are done with the inode, and in the process of freeing
2495 * the state_owner. we keep this around to process errors
2496 */
2497 switch (task->tk_status) {
2498 case 0:
2499 if (calldata->roc)
2500 pnfs_roc_set_barrier(state->inode,
2501 calldata->roc_barrier);
2502 nfs_set_open_stateid(state, &calldata->res.stateid, 0);
2503 renew_lease(server, calldata->timestamp);
2504 nfs4_close_clear_stateid_flags(state,
2505 calldata->arg.fmode);
2506 break;
2507 case -NFS4ERR_STALE_STATEID:
2508 case -NFS4ERR_OLD_STATEID:
2509 case -NFS4ERR_BAD_STATEID:
2510 case -NFS4ERR_EXPIRED:
2511 if (calldata->arg.fmode == 0)
2512 break;
2513 default:
2514 if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
2515 rpc_restart_call_prepare(task);
2516 }
2517 nfs_release_seqid(calldata->arg.seqid);
2518 nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2519 dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2520}
2521
2522static void nfs4_close_prepare(struct rpc_task *task, void *data)
2523{
2524 struct nfs4_closedata *calldata = data;
2525 struct nfs4_state *state = calldata->state;
2526 struct inode *inode = calldata->inode;
2527 int call_close = 0;
2528
2529 dprintk("%s: begin!\n", __func__);
2530 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2531 goto out_wait;
2532
2533 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2534 calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2535 spin_lock(&state->owner->so_lock);
2536 /* Calculate the change in open mode */
2537 if (state->n_rdwr == 0) {
2538 if (state->n_rdonly == 0) {
2539 call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2540 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2541 calldata->arg.fmode &= ~FMODE_READ;
2542 }
2543 if (state->n_wronly == 0) {
2544 call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2545 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2546 calldata->arg.fmode &= ~FMODE_WRITE;
2547 }
2548 }
2549 if (!nfs4_valid_open_stateid(state))
2550 call_close = 0;
2551 spin_unlock(&state->owner->so_lock);
2552
2553 if (!call_close) {
2554 /* Note: exit _without_ calling nfs4_close_done */
2555 goto out_no_action;
2556 }
2557
2558 if (calldata->arg.fmode == 0) {
2559 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2560 if (calldata->roc &&
2561 pnfs_roc_drain(inode, &calldata->roc_barrier, task)) {
2562 nfs_release_seqid(calldata->arg.seqid);
2563 goto out_wait;
2564 }
2565 }
2566
2567 nfs_fattr_init(calldata->res.fattr);
2568 calldata->timestamp = jiffies;
2569 if (nfs4_setup_sequence(NFS_SERVER(inode),
2570 &calldata->arg.seq_args,
2571 &calldata->res.seq_res,
2572 task) != 0)
2573 nfs_release_seqid(calldata->arg.seqid);
2574 dprintk("%s: done!\n", __func__);
2575 return;
2576out_no_action:
2577 task->tk_action = NULL;
2578out_wait:
2579 nfs4_sequence_done(task, &calldata->res.seq_res);
2580}
2581
2582static const struct rpc_call_ops nfs4_close_ops = {
2583 .rpc_call_prepare = nfs4_close_prepare,
2584 .rpc_call_done = nfs4_close_done,
2585 .rpc_release = nfs4_free_closedata,
2586};
2587
2588/*
2589 * It is possible for data to be read/written from a mem-mapped file
2590 * after the sys_close call (which hits the vfs layer as a flush).
2591 * This means that we can't safely call nfsv4 close on a file until
2592 * the inode is cleared. This in turn means that we are not good
2593 * NFSv4 citizens - we do not indicate to the server to update the file's
2594 * share state even when we are done with one of the three share
2595 * stateid's in the inode.
2596 *
2597 * NOTE: Caller must be holding the sp->so_owner semaphore!
2598 */
2599int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2600{
2601 struct nfs_server *server = NFS_SERVER(state->inode);
2602 struct nfs4_closedata *calldata;
2603 struct nfs4_state_owner *sp = state->owner;
2604 struct rpc_task *task;
2605 struct rpc_message msg = {
2606 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2607 .rpc_cred = state->owner->so_cred,
2608 };
2609 struct rpc_task_setup task_setup_data = {
2610 .rpc_client = server->client,
2611 .rpc_message = &msg,
2612 .callback_ops = &nfs4_close_ops,
2613 .workqueue = nfsiod_workqueue,
2614 .flags = RPC_TASK_ASYNC,
2615 };
2616 int status = -ENOMEM;
2617
2618 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
2619 &task_setup_data.rpc_client, &msg);
2620
2621 calldata = kzalloc(sizeof(*calldata), gfp_mask);
2622 if (calldata == NULL)
2623 goto out;
2624 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2625 calldata->inode = state->inode;
2626 calldata->state = state;
2627 calldata->arg.fh = NFS_FH(state->inode);
2628 calldata->arg.stateid = &state->open_stateid;
2629 /* Serialization for the sequence id */
2630 calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2631 if (calldata->arg.seqid == NULL)
2632 goto out_free_calldata;
2633 calldata->arg.fmode = 0;
2634 calldata->arg.bitmask = server->cache_consistency_bitmask;
2635 calldata->res.fattr = &calldata->fattr;
2636 calldata->res.seqid = calldata->arg.seqid;
2637 calldata->res.server = server;
2638 calldata->roc = pnfs_roc(state->inode);
2639 nfs_sb_active(calldata->inode->i_sb);
2640
2641 msg.rpc_argp = &calldata->arg;
2642 msg.rpc_resp = &calldata->res;
2643 task_setup_data.callback_data = calldata;
2644 task = rpc_run_task(&task_setup_data);
2645 if (IS_ERR(task))
2646 return PTR_ERR(task);
2647 status = 0;
2648 if (wait)
2649 status = rpc_wait_for_completion_task(task);
2650 rpc_put_task(task);
2651 return status;
2652out_free_calldata:
2653 kfree(calldata);
2654out:
2655 nfs4_put_open_state(state);
2656 nfs4_put_state_owner(sp);
2657 return status;
2658}
2659
2660static struct inode *
2661nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2662{
2663 struct nfs4_state *state;
2664 struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;
2665
2666 label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
2667
2668 /* Protect against concurrent sillydeletes */
2669 state = nfs4_do_open(dir, ctx, open_flags, attr, label);
2670
2671 nfs4_label_release_security(label);
2672
2673 if (IS_ERR(state))
2674 return ERR_CAST(state);
2675 return state->inode;
2676}
2677
2678static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2679{
2680 if (ctx->state == NULL)
2681 return;
2682 if (is_sync)
2683 nfs4_close_sync(ctx->state, ctx->mode);
2684 else
2685 nfs4_close_state(ctx->state, ctx->mode);
2686}
2687
2688static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2689{
2690 struct nfs4_server_caps_arg args = {
2691 .fhandle = fhandle,
2692 };
2693 struct nfs4_server_caps_res res = {};
2694 struct rpc_message msg = {
2695 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2696 .rpc_argp = &args,
2697 .rpc_resp = &res,
2698 };
2699 int status;
2700
2701 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2702 if (status == 0) {
2703 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2704 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2705 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2706 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2707 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2708 NFS_CAP_CTIME|NFS_CAP_MTIME);
2709 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2710 server->caps |= NFS_CAP_ACLS;
2711 if (res.has_links != 0)
2712 server->caps |= NFS_CAP_HARDLINKS;
2713 if (res.has_symlinks != 0)
2714 server->caps |= NFS_CAP_SYMLINKS;
2715 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2716 server->caps |= NFS_CAP_FILEID;
2717 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2718 server->caps |= NFS_CAP_MODE;
2719 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2720 server->caps |= NFS_CAP_NLINK;
2721 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2722 server->caps |= NFS_CAP_OWNER;
2723 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2724 server->caps |= NFS_CAP_OWNER_GROUP;
2725 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2726 server->caps |= NFS_CAP_ATIME;
2727 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2728 server->caps |= NFS_CAP_CTIME;
2729 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2730 server->caps |= NFS_CAP_MTIME;
2731#ifdef CONFIG_NFS_V4_SECURITY_LABEL
2732 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
2733 server->caps |= NFS_CAP_SECURITY_LABEL;
2734#endif
2735 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
2736 sizeof(server->attr_bitmask));
2737
2738 if (server->caps & NFS_CAP_SECURITY_LABEL) {
2739 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2740 res.attr_bitmask[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2741 }
2742 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2743 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2744 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2745 server->acl_bitmask = res.acl_bitmask;
2746 server->fh_expire_type = res.fh_expire_type;
2747 }
2748
2749 return status;
2750}
2751
2752int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2753{
2754 struct nfs4_exception exception = { };
2755 int err;
2756 do {
2757 err = nfs4_handle_exception(server,
2758 _nfs4_server_capabilities(server, fhandle),
2759 &exception);
2760 } while (exception.retry);
2761 return err;
2762}
2763
2764static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2765 struct nfs_fsinfo *info)
2766{
2767 u32 bitmask[3];
2768 struct nfs4_lookup_root_arg args = {
2769 .bitmask = bitmask,
2770 };
2771 struct nfs4_lookup_res res = {
2772 .server = server,
2773 .fattr = info->fattr,
2774 .fh = fhandle,
2775 };
2776 struct rpc_message msg = {
2777 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2778 .rpc_argp = &args,
2779 .rpc_resp = &res,
2780 };
2781
2782 bitmask[0] = nfs4_fattr_bitmap[0];
2783 bitmask[1] = nfs4_fattr_bitmap[1];
2784 /*
2785 * Process the label in the upcoming getfattr
2786 */
2787 bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
2788
2789 nfs_fattr_init(info->fattr);
2790 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2791}
2792
2793static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2794 struct nfs_fsinfo *info)
2795{
2796 struct nfs4_exception exception = { };
2797 int err;
2798 do {
2799 err = _nfs4_lookup_root(server, fhandle, info);
2800 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
2801 switch (err) {
2802 case 0:
2803 case -NFS4ERR_WRONGSEC:
2804 goto out;
2805 default:
2806 err = nfs4_handle_exception(server, err, &exception);
2807 }
2808 } while (exception.retry);
2809out:
2810 return err;
2811}
2812
2813static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2814 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2815{
2816 struct rpc_auth_create_args auth_args = {
2817 .pseudoflavor = flavor,
2818 };
2819 struct rpc_auth *auth;
2820 int ret;
2821
2822 auth = rpcauth_create(&auth_args, server->client);
2823 if (IS_ERR(auth)) {
2824 ret = -EACCES;
2825 goto out;
2826 }
2827 ret = nfs4_lookup_root(server, fhandle, info);
2828out:
2829 return ret;
2830}
2831
2832/*
2833 * Retry pseudoroot lookup with various security flavors. We do this when:
2834 *
2835 * NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
2836 * NFSv4.1: the server does not support the SECINFO_NO_NAME operation
2837 *
2838 * Returns zero on success, or a negative NFS4ERR value, or a
2839 * negative errno value.
2840 */
2841static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2842 struct nfs_fsinfo *info)
2843{
2844 /* Per 3530bis 15.33.5 */
2845 static const rpc_authflavor_t flav_array[] = {
2846 RPC_AUTH_GSS_KRB5P,
2847 RPC_AUTH_GSS_KRB5I,
2848 RPC_AUTH_GSS_KRB5,
2849 RPC_AUTH_UNIX, /* courtesy */
2850 RPC_AUTH_NULL,
2851 };
2852 int status = -EPERM;
2853 size_t i;
2854
2855 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
2856 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2857 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2858 continue;
2859 break;
2860 }
2861
2862 /*
2863 * -EACCESS could mean that the user doesn't have correct permissions
2864 * to access the mount. It could also mean that we tried to mount
2865 * with a gss auth flavor, but rpc.gssd isn't running. Either way,
2866 * existing mount programs don't handle -EACCES very well so it should
2867 * be mapped to -EPERM instead.
2868 */
2869 if (status == -EACCES)
2870 status = -EPERM;
2871 return status;
2872}
2873
2874static int nfs4_do_find_root_sec(struct nfs_server *server,
2875 struct nfs_fh *fhandle, struct nfs_fsinfo *info)
2876{
2877 int mv = server->nfs_client->cl_minorversion;
2878 return nfs_v4_minor_ops[mv]->find_root_sec(server, fhandle, info);
2879}
2880
2881/**
2882 * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
2883 * @server: initialized nfs_server handle
2884 * @fhandle: we fill in the pseudo-fs root file handle
2885 * @info: we fill in an FSINFO struct
2886 *
2887 * Returns zero on success, or a negative errno.
2888 */
2889int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
2890 struct nfs_fsinfo *info)
2891{
2892 int status;
2893
2894 status = nfs4_lookup_root(server, fhandle, info);
2895 if ((status == -NFS4ERR_WRONGSEC) &&
2896 !(server->flags & NFS_MOUNT_SECFLAVOUR))
2897 status = nfs4_do_find_root_sec(server, fhandle, info);
2898
2899 if (status == 0)
2900 status = nfs4_server_capabilities(server, fhandle);
2901 if (status == 0)
2902 status = nfs4_do_fsinfo(server, fhandle, info);
2903
2904 return nfs4_map_errors(status);
2905}
2906
2907static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
2908 struct nfs_fsinfo *info)
2909{
2910 int error;
2911 struct nfs_fattr *fattr = info->fattr;
2912 struct nfs4_label *label = NULL;
2913
2914 error = nfs4_server_capabilities(server, mntfh);
2915 if (error < 0) {
2916 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
2917 return error;
2918 }
2919
2920 label = nfs4_label_alloc(server, GFP_KERNEL);
2921 if (IS_ERR(label))
2922 return PTR_ERR(label);
2923
2924 error = nfs4_proc_getattr(server, mntfh, fattr, label);
2925 if (error < 0) {
2926 dprintk("nfs4_get_root: getattr error = %d\n", -error);
2927 goto err_free_label;
2928 }
2929
2930 if (fattr->valid & NFS_ATTR_FATTR_FSID &&
2931 !nfs_fsid_equal(&server->fsid, &fattr->fsid))
2932 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
2933
2934err_free_label:
2935 nfs4_label_free(label);
2936
2937 return error;
2938}
2939
2940/*
2941 * Get locations and (maybe) other attributes of a referral.
2942 * Note that we'll actually follow the referral later when
2943 * we detect fsid mismatch in inode revalidation
2944 */
2945static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
2946 const struct qstr *name, struct nfs_fattr *fattr,
2947 struct nfs_fh *fhandle)
2948{
2949 int status = -ENOMEM;
2950 struct page *page = NULL;
2951 struct nfs4_fs_locations *locations = NULL;
2952
2953 page = alloc_page(GFP_KERNEL);
2954 if (page == NULL)
2955 goto out;
2956 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2957 if (locations == NULL)
2958 goto out;
2959
2960 status = nfs4_proc_fs_locations(client, dir, name, locations, page);
2961 if (status != 0)
2962 goto out;
2963 /* Make sure server returned a different fsid for the referral */
2964 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2965 dprintk("%s: server did not return a different fsid for"
2966 " a referral at %s\n", __func__, name->name);
2967 status = -EIO;
2968 goto out;
2969 }
2970 /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2971 nfs_fixup_referral_attributes(&locations->fattr);
2972
2973 /* replace the lookup nfs_fattr with the locations nfs_fattr */
2974 memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2975 memset(fhandle, 0, sizeof(struct nfs_fh));
2976out:
2977 if (page)
2978 __free_page(page);
2979 kfree(locations);
2980 return status;
2981}
2982
2983static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
2984 struct nfs_fattr *fattr, struct nfs4_label *label)
2985{
2986 struct nfs4_getattr_arg args = {
2987 .fh = fhandle,
2988 .bitmask = server->attr_bitmask,
2989 };
2990 struct nfs4_getattr_res res = {
2991 .fattr = fattr,
2992 .label = label,
2993 .server = server,
2994 };
2995 struct rpc_message msg = {
2996 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2997 .rpc_argp = &args,
2998 .rpc_resp = &res,
2999 };
3000
3001 args.bitmask = nfs4_bitmask(server, label);
3002
3003 nfs_fattr_init(fattr);
3004 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3005}
3006
3007static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3008 struct nfs_fattr *fattr, struct nfs4_label *label)
3009{
3010 struct nfs4_exception exception = { };
3011 int err;
3012 do {
3013 err = _nfs4_proc_getattr(server, fhandle, fattr, label);
3014 trace_nfs4_getattr(server, fhandle, fattr, err);
3015 err = nfs4_handle_exception(server, err,
3016 &exception);
3017 } while (exception.retry);
3018 return err;
3019}
3020
3021/*
3022 * The file is not closed if it is opened due to the a request to change
3023 * the size of the file. The open call will not be needed once the
3024 * VFS layer lookup-intents are implemented.
3025 *
3026 * Close is called when the inode is destroyed.
3027 * If we haven't opened the file for O_WRONLY, we
3028 * need to in the size_change case to obtain a stateid.
3029 *
3030 * Got race?
3031 * Because OPEN is always done by name in nfsv4, it is
3032 * possible that we opened a different file by the same
3033 * name. We can recognize this race condition, but we
3034 * can't do anything about it besides returning an error.
3035 *
3036 * This will be fixed with VFS changes (lookup-intent).
3037 */
3038static int
3039nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
3040 struct iattr *sattr)
3041{
3042 struct inode *inode = dentry->d_inode;
3043 struct rpc_cred *cred = NULL;
3044 struct nfs4_state *state = NULL;
3045 struct nfs4_label *label = NULL;
3046 int status;
3047
3048 if (pnfs_ld_layoutret_on_setattr(inode))
3049 pnfs_commit_and_return_layout(inode);
3050
3051 nfs_fattr_init(fattr);
3052
3053 /* Deal with open(O_TRUNC) */
3054 if (sattr->ia_valid & ATTR_OPEN)
3055 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
3056
3057 /* Optimization: if the end result is no change, don't RPC */
3058 if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
3059 return 0;
3060
3061 /* Search for an existing open(O_WRITE) file */
3062 if (sattr->ia_valid & ATTR_FILE) {
3063 struct nfs_open_context *ctx;
3064
3065 ctx = nfs_file_open_context(sattr->ia_file);
3066 if (ctx) {
3067 cred = ctx->cred;
3068 state = ctx->state;
3069 }
3070 }
3071
3072 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
3073 if (IS_ERR(label))
3074 return PTR_ERR(label);
3075
3076 status = nfs4_do_setattr(inode, cred, fattr, sattr, state, NULL, label);
3077 if (status == 0) {
3078 nfs_setattr_update_inode(inode, sattr);
3079 nfs_setsecurity(inode, fattr, label);
3080 }
3081 nfs4_label_free(label);
3082 return status;
3083}
3084
3085static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
3086 const struct qstr *name, struct nfs_fh *fhandle,
3087 struct nfs_fattr *fattr, struct nfs4_label *label)
3088{
3089 struct nfs_server *server = NFS_SERVER(dir);
3090 int status;
3091 struct nfs4_lookup_arg args = {
3092 .bitmask = server->attr_bitmask,
3093 .dir_fh = NFS_FH(dir),
3094 .name = name,
3095 };
3096 struct nfs4_lookup_res res = {
3097 .server = server,
3098 .fattr = fattr,
3099 .label = label,
3100 .fh = fhandle,
3101 };
3102 struct rpc_message msg = {
3103 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
3104 .rpc_argp = &args,
3105 .rpc_resp = &res,
3106 };
3107
3108 args.bitmask = nfs4_bitmask(server, label);
3109
3110 nfs_fattr_init(fattr);
3111
3112 dprintk("NFS call lookup %s\n", name->name);
3113 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
3114 dprintk("NFS reply lookup: %d\n", status);
3115 return status;
3116}
3117
3118static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
3119{
3120 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
3121 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
3122 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
3123 fattr->nlink = 2;
3124}
3125
3126static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
3127 struct qstr *name, struct nfs_fh *fhandle,
3128 struct nfs_fattr *fattr, struct nfs4_label *label)
3129{
3130 struct nfs4_exception exception = { };
3131 struct rpc_clnt *client = *clnt;
3132 int err;
3133 do {
3134 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label);
3135 trace_nfs4_lookup(dir, name, err);
3136 switch (err) {
3137 case -NFS4ERR_BADNAME:
3138 err = -ENOENT;
3139 goto out;
3140 case -NFS4ERR_MOVED:
3141 err = nfs4_get_referral(client, dir, name, fattr, fhandle);
3142 goto out;
3143 case -NFS4ERR_WRONGSEC:
3144 err = -EPERM;
3145 if (client != *clnt)
3146 goto out;
3147
3148 client = nfs4_create_sec_client(client, dir, name);
3149 if (IS_ERR(client))
3150 return PTR_ERR(client);
3151
3152 exception.retry = 1;
3153 break;
3154 default:
3155 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3156 }
3157 } while (exception.retry);
3158
3159out:
3160 if (err == 0)
3161 *clnt = client;
3162 else if (client != *clnt)
3163 rpc_shutdown_client(client);
3164
3165 return err;
3166}
3167
3168static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
3169 struct nfs_fh *fhandle, struct nfs_fattr *fattr,
3170 struct nfs4_label *label)
3171{
3172 int status;
3173 struct rpc_clnt *client = NFS_CLIENT(dir);
3174
3175 status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label);
3176 if (client != NFS_CLIENT(dir)) {
3177 rpc_shutdown_client(client);
3178 nfs_fixup_secinfo_attributes(fattr);
3179 }
3180 return status;
3181}
3182
3183struct rpc_clnt *
3184nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
3185 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
3186{
3187 int status;
3188 struct rpc_clnt *client = rpc_clone_client(NFS_CLIENT(dir));
3189
3190 status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL);
3191 if (status < 0) {
3192 rpc_shutdown_client(client);
3193 return ERR_PTR(status);
3194 }
3195 return client;
3196}
3197
3198static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3199{
3200 struct nfs_server *server = NFS_SERVER(inode);
3201 struct nfs4_accessargs args = {
3202 .fh = NFS_FH(inode),
3203 .bitmask = server->cache_consistency_bitmask,
3204 };
3205 struct nfs4_accessres res = {
3206 .server = server,
3207 };
3208 struct rpc_message msg = {
3209 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
3210 .rpc_argp = &args,
3211 .rpc_resp = &res,
3212 .rpc_cred = entry->cred,
3213 };
3214 int mode = entry->mask;
3215 int status = 0;
3216
3217 /*
3218 * Determine which access bits we want to ask for...
3219 */
3220 if (mode & MAY_READ)
3221 args.access |= NFS4_ACCESS_READ;
3222 if (S_ISDIR(inode->i_mode)) {
3223 if (mode & MAY_WRITE)
3224 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
3225 if (mode & MAY_EXEC)
3226 args.access |= NFS4_ACCESS_LOOKUP;
3227 } else {
3228 if (mode & MAY_WRITE)
3229 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
3230 if (mode & MAY_EXEC)
3231 args.access |= NFS4_ACCESS_EXECUTE;
3232 }
3233
3234 res.fattr = nfs_alloc_fattr();
3235 if (res.fattr == NULL)
3236 return -ENOMEM;
3237
3238 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3239 if (!status) {
3240 nfs_access_set_mask(entry, res.access);
3241 nfs_refresh_inode(inode, res.fattr);
3242 }
3243 nfs_free_fattr(res.fattr);
3244 return status;
3245}
3246
3247static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3248{
3249 struct nfs4_exception exception = { };
3250 int err;
3251 do {
3252 err = _nfs4_proc_access(inode, entry);
3253 trace_nfs4_access(inode, err);
3254 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3255 &exception);
3256 } while (exception.retry);
3257 return err;
3258}
3259
3260/*
3261 * TODO: For the time being, we don't try to get any attributes
3262 * along with any of the zero-copy operations READ, READDIR,
3263 * READLINK, WRITE.
3264 *
3265 * In the case of the first three, we want to put the GETATTR
3266 * after the read-type operation -- this is because it is hard
3267 * to predict the length of a GETATTR response in v4, and thus
3268 * align the READ data correctly. This means that the GETATTR
3269 * may end up partially falling into the page cache, and we should
3270 * shift it into the 'tail' of the xdr_buf before processing.
3271 * To do this efficiently, we need to know the total length
3272 * of data received, which doesn't seem to be available outside
3273 * of the RPC layer.
3274 *
3275 * In the case of WRITE, we also want to put the GETATTR after
3276 * the operation -- in this case because we want to make sure
3277 * we get the post-operation mtime and size.
3278 *
3279 * Both of these changes to the XDR layer would in fact be quite
3280 * minor, but I decided to leave them for a subsequent patch.
3281 */
3282static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
3283 unsigned int pgbase, unsigned int pglen)
3284{
3285 struct nfs4_readlink args = {
3286 .fh = NFS_FH(inode),
3287 .pgbase = pgbase,
3288 .pglen = pglen,
3289 .pages = &page,
3290 };
3291 struct nfs4_readlink_res res;
3292 struct rpc_message msg = {
3293 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
3294 .rpc_argp = &args,
3295 .rpc_resp = &res,
3296 };
3297
3298 return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3299}
3300
3301static int nfs4_proc_readlink(struct inode *inode, struct page *page,
3302 unsigned int pgbase, unsigned int pglen)
3303{
3304 struct nfs4_exception exception = { };
3305 int err;
3306 do {
3307 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
3308 trace_nfs4_readlink(inode, err);
3309 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3310 &exception);
3311 } while (exception.retry);
3312 return err;
3313}
3314
3315/*
3316 * This is just for mknod. open(O_CREAT) will always do ->open_context().
3317 */
3318static int
3319nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
3320 int flags)
3321{
3322 struct nfs4_label l, *ilabel = NULL;
3323 struct nfs_open_context *ctx;
3324 struct nfs4_state *state;
3325 int status = 0;
3326
3327 ctx = alloc_nfs_open_context(dentry, FMODE_READ);
3328 if (IS_ERR(ctx))
3329 return PTR_ERR(ctx);
3330
3331 ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
3332
3333 sattr->ia_mode &= ~current_umask();
3334 state = nfs4_do_open(dir, ctx, flags, sattr, ilabel);
3335 if (IS_ERR(state)) {
3336 status = PTR_ERR(state);
3337 goto out;
3338 }
3339out:
3340 nfs4_label_release_security(ilabel);
3341 put_nfs_open_context(ctx);
3342 return status;
3343}
3344
3345static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
3346{
3347 struct nfs_server *server = NFS_SERVER(dir);
3348 struct nfs_removeargs args = {
3349 .fh = NFS_FH(dir),
3350 .name = *name,
3351 };
3352 struct nfs_removeres res = {
3353 .server = server,
3354 };
3355 struct rpc_message msg = {
3356 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
3357 .rpc_argp = &args,
3358 .rpc_resp = &res,
3359 };
3360 int status;
3361
3362 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
3363 if (status == 0)
3364 update_changeattr(dir, &res.cinfo);
3365 return status;
3366}
3367
3368static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
3369{
3370 struct nfs4_exception exception = { };
3371 int err;
3372 do {
3373 err = _nfs4_proc_remove(dir, name);
3374 trace_nfs4_remove(dir, name, err);
3375 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3376 &exception);
3377 } while (exception.retry);
3378 return err;
3379}
3380
3381static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
3382{
3383 struct nfs_server *server = NFS_SERVER(dir);
3384 struct nfs_removeargs *args = msg->rpc_argp;
3385 struct nfs_removeres *res = msg->rpc_resp;
3386
3387 res->server = server;
3388 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
3389 nfs4_init_sequence(&args->seq_args, &res->seq_res, 1);
3390
3391 nfs_fattr_init(res->dir_attr);
3392}
3393
3394static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
3395{
3396 nfs4_setup_sequence(NFS_SERVER(data->dir),
3397 &data->args.seq_args,
3398 &data->res.seq_res,
3399 task);
3400}
3401
3402static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
3403{
3404 struct nfs_unlinkdata *data = task->tk_calldata;
3405 struct nfs_removeres *res = &data->res;
3406
3407 if (!nfs4_sequence_done(task, &res->seq_res))
3408 return 0;
3409 if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3410 return 0;
3411 update_changeattr(dir, &res->cinfo);
3412 return 1;
3413}
3414
3415static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
3416{
3417 struct nfs_server *server = NFS_SERVER(dir);
3418 struct nfs_renameargs *arg = msg->rpc_argp;
3419 struct nfs_renameres *res = msg->rpc_resp;
3420
3421 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
3422 res->server = server;
3423 nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1);
3424}
3425
3426static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3427{
3428 nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3429 &data->args.seq_args,
3430 &data->res.seq_res,
3431 task);
3432}
3433
3434static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3435 struct inode *new_dir)
3436{
3437 struct nfs_renamedata *data = task->tk_calldata;
3438 struct nfs_renameres *res = &data->res;
3439
3440 if (!nfs4_sequence_done(task, &res->seq_res))
3441 return 0;
3442 if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3443 return 0;
3444
3445 update_changeattr(old_dir, &res->old_cinfo);
3446 update_changeattr(new_dir, &res->new_cinfo);
3447 return 1;
3448}
3449
3450static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3451 struct inode *new_dir, struct qstr *new_name)
3452{
3453 struct nfs_server *server = NFS_SERVER(old_dir);
3454 struct nfs_renameargs arg = {
3455 .old_dir = NFS_FH(old_dir),
3456 .new_dir = NFS_FH(new_dir),
3457 .old_name = old_name,
3458 .new_name = new_name,
3459 };
3460 struct nfs_renameres res = {
3461 .server = server,
3462 };
3463 struct rpc_message msg = {
3464 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
3465 .rpc_argp = &arg,
3466 .rpc_resp = &res,
3467 };
3468 int status = -ENOMEM;
3469
3470 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3471 if (!status) {
3472 update_changeattr(old_dir, &res.old_cinfo);
3473 update_changeattr(new_dir, &res.new_cinfo);
3474 }
3475 return status;
3476}
3477
3478static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3479 struct inode *new_dir, struct qstr *new_name)
3480{
3481 struct nfs4_exception exception = { };
3482 int err;
3483 do {
3484 err = _nfs4_proc_rename(old_dir, old_name,
3485 new_dir, new_name);
3486 trace_nfs4_rename(old_dir, old_name, new_dir, new_name, err);
3487 err = nfs4_handle_exception(NFS_SERVER(old_dir), err,
3488 &exception);
3489 } while (exception.retry);
3490 return err;
3491}
3492
3493static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3494{
3495 struct nfs_server *server = NFS_SERVER(inode);
3496 struct nfs4_link_arg arg = {
3497 .fh = NFS_FH(inode),
3498 .dir_fh = NFS_FH(dir),
3499 .name = name,
3500 .bitmask = server->attr_bitmask,
3501 };
3502 struct nfs4_link_res res = {
3503 .server = server,
3504 .label = NULL,
3505 };
3506 struct rpc_message msg = {
3507 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3508 .rpc_argp = &arg,
3509 .rpc_resp = &res,
3510 };
3511 int status = -ENOMEM;
3512
3513 res.fattr = nfs_alloc_fattr();
3514 if (res.fattr == NULL)
3515 goto out;
3516
3517 res.label = nfs4_label_alloc(server, GFP_KERNEL);
3518 if (IS_ERR(res.label)) {
3519 status = PTR_ERR(res.label);
3520 goto out;
3521 }
3522 arg.bitmask = nfs4_bitmask(server, res.label);
3523
3524 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3525 if (!status) {
3526 update_changeattr(dir, &res.cinfo);
3527 status = nfs_post_op_update_inode(inode, res.fattr);
3528 if (!status)
3529 nfs_setsecurity(inode, res.fattr, res.label);
3530 }
3531
3532
3533 nfs4_label_free(res.label);
3534
3535out:
3536 nfs_free_fattr(res.fattr);
3537 return status;
3538}
3539
3540static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3541{
3542 struct nfs4_exception exception = { };
3543 int err;
3544 do {
3545 err = nfs4_handle_exception(NFS_SERVER(inode),
3546 _nfs4_proc_link(inode, dir, name),
3547 &exception);
3548 } while (exception.retry);
3549 return err;
3550}
3551
3552struct nfs4_createdata {
3553 struct rpc_message msg;
3554 struct nfs4_create_arg arg;
3555 struct nfs4_create_res res;
3556 struct nfs_fh fh;
3557 struct nfs_fattr fattr;
3558 struct nfs4_label *label;
3559};
3560
3561static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3562 struct qstr *name, struct iattr *sattr, u32 ftype)
3563{
3564 struct nfs4_createdata *data;
3565
3566 data = kzalloc(sizeof(*data), GFP_KERNEL);
3567 if (data != NULL) {
3568 struct nfs_server *server = NFS_SERVER(dir);
3569
3570 data->label = nfs4_label_alloc(server, GFP_KERNEL);
3571 if (IS_ERR(data->label))
3572 goto out_free;
3573
3574 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3575 data->msg.rpc_argp = &data->arg;
3576 data->msg.rpc_resp = &data->res;
3577 data->arg.dir_fh = NFS_FH(dir);
3578 data->arg.server = server;
3579 data->arg.name = name;
3580 data->arg.attrs = sattr;
3581 data->arg.ftype = ftype;
3582 data->arg.bitmask = nfs4_bitmask(server, data->label);
3583 data->res.server = server;
3584 data->res.fh = &data->fh;
3585 data->res.fattr = &data->fattr;
3586 data->res.label = data->label;
3587 nfs_fattr_init(data->res.fattr);
3588 }
3589 return data;
3590out_free:
3591 kfree(data);
3592 return NULL;
3593}
3594
3595static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3596{
3597 int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3598 &data->arg.seq_args, &data->res.seq_res, 1);
3599 if (status == 0) {
3600 update_changeattr(dir, &data->res.dir_cinfo);
3601 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label);
3602 }
3603 return status;
3604}
3605
3606static void nfs4_free_createdata(struct nfs4_createdata *data)
3607{
3608 nfs4_label_free(data->label);
3609 kfree(data);
3610}
3611
3612static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3613 struct page *page, unsigned int len, struct iattr *sattr,
3614 struct nfs4_label *label)
3615{
3616 struct nfs4_createdata *data;
3617 int status = -ENAMETOOLONG;
3618
3619 if (len > NFS4_MAXPATHLEN)
3620 goto out;
3621
3622 status = -ENOMEM;
3623 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3624 if (data == NULL)
3625 goto out;
3626
3627 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3628 data->arg.u.symlink.pages = &page;
3629 data->arg.u.symlink.len = len;
3630 data->arg.label = label;
3631
3632 status = nfs4_do_create(dir, dentry, data);
3633
3634 nfs4_free_createdata(data);
3635out:
3636 return status;
3637}
3638
3639static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3640 struct page *page, unsigned int len, struct iattr *sattr)
3641{
3642 struct nfs4_exception exception = { };
3643 struct nfs4_label l, *label = NULL;
3644 int err;
3645
3646 label = nfs4_label_init_security(dir, dentry, sattr, &l);
3647
3648 do {
3649 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
3650 trace_nfs4_symlink(dir, &dentry->d_name, err);
3651 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3652 &exception);
3653 } while (exception.retry);
3654
3655 nfs4_label_release_security(label);
3656 return err;
3657}
3658
3659static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3660 struct iattr *sattr, struct nfs4_label *label)
3661{
3662 struct nfs4_createdata *data;
3663 int status = -ENOMEM;
3664
3665 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3666 if (data == NULL)
3667 goto out;
3668
3669 data->arg.label = label;
3670 status = nfs4_do_create(dir, dentry, data);
3671
3672 nfs4_free_createdata(data);
3673out:
3674 return status;
3675}
3676
3677static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3678 struct iattr *sattr)
3679{
3680 struct nfs4_exception exception = { };
3681 struct nfs4_label l, *label = NULL;
3682 int err;
3683
3684 label = nfs4_label_init_security(dir, dentry, sattr, &l);
3685
3686 sattr->ia_mode &= ~current_umask();
3687 do {
3688 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
3689 trace_nfs4_mkdir(dir, &dentry->d_name, err);
3690 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3691 &exception);
3692 } while (exception.retry);
3693 nfs4_label_release_security(label);
3694
3695 return err;
3696}
3697
3698static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3699 u64 cookie, struct page **pages, unsigned int count, int plus)
3700{
3701 struct inode *dir = dentry->d_inode;
3702 struct nfs4_readdir_arg args = {
3703 .fh = NFS_FH(dir),
3704 .pages = pages,
3705 .pgbase = 0,
3706 .count = count,
3707 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3708 .plus = plus,
3709 };
3710 struct nfs4_readdir_res res;
3711 struct rpc_message msg = {
3712 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3713 .rpc_argp = &args,
3714 .rpc_resp = &res,
3715 .rpc_cred = cred,
3716 };
3717 int status;
3718
3719 dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3720 dentry->d_parent->d_name.name,
3721 dentry->d_name.name,
3722 (unsigned long long)cookie);
3723 nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3724 res.pgbase = args.pgbase;
3725 status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3726 if (status >= 0) {
3727 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3728 status += args.pgbase;
3729 }
3730
3731 nfs_invalidate_atime(dir);
3732
3733 dprintk("%s: returns %d\n", __func__, status);
3734 return status;
3735}
3736
3737static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3738 u64 cookie, struct page **pages, unsigned int count, int plus)
3739{
3740 struct nfs4_exception exception = { };
3741 int err;
3742 do {
3743 err = _nfs4_proc_readdir(dentry, cred, cookie,
3744 pages, count, plus);
3745 trace_nfs4_readdir(dentry->d_inode, err);
3746 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode), err,
3747 &exception);
3748 } while (exception.retry);
3749 return err;
3750}
3751
3752static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3753 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
3754{
3755 struct nfs4_createdata *data;
3756 int mode = sattr->ia_mode;
3757 int status = -ENOMEM;
3758
3759 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3760 if (data == NULL)
3761 goto out;
3762
3763 if (S_ISFIFO(mode))
3764 data->arg.ftype = NF4FIFO;
3765 else if (S_ISBLK(mode)) {
3766 data->arg.ftype = NF4BLK;
3767 data->arg.u.device.specdata1 = MAJOR(rdev);
3768 data->arg.u.device.specdata2 = MINOR(rdev);
3769 }
3770 else if (S_ISCHR(mode)) {
3771 data->arg.ftype = NF4CHR;
3772 data->arg.u.device.specdata1 = MAJOR(rdev);
3773 data->arg.u.device.specdata2 = MINOR(rdev);
3774 } else if (!S_ISSOCK(mode)) {
3775 status = -EINVAL;
3776 goto out_free;
3777 }
3778
3779 data->arg.label = label;
3780 status = nfs4_do_create(dir, dentry, data);
3781out_free:
3782 nfs4_free_createdata(data);
3783out:
3784 return status;
3785}
3786
3787static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3788 struct iattr *sattr, dev_t rdev)
3789{
3790 struct nfs4_exception exception = { };
3791 struct nfs4_label l, *label = NULL;
3792 int err;
3793
3794 label = nfs4_label_init_security(dir, dentry, sattr, &l);
3795
3796 sattr->ia_mode &= ~current_umask();
3797 do {
3798 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
3799 trace_nfs4_mknod(dir, &dentry->d_name, err);
3800 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3801 &exception);
3802 } while (exception.retry);
3803
3804 nfs4_label_release_security(label);
3805
3806 return err;
3807}
3808
3809static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3810 struct nfs_fsstat *fsstat)
3811{
3812 struct nfs4_statfs_arg args = {
3813 .fh = fhandle,
3814 .bitmask = server->attr_bitmask,
3815 };
3816 struct nfs4_statfs_res res = {
3817 .fsstat = fsstat,
3818 };
3819 struct rpc_message msg = {
3820 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3821 .rpc_argp = &args,
3822 .rpc_resp = &res,
3823 };
3824
3825 nfs_fattr_init(fsstat->fattr);
3826 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3827}
3828
3829static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3830{
3831 struct nfs4_exception exception = { };
3832 int err;
3833 do {
3834 err = nfs4_handle_exception(server,
3835 _nfs4_proc_statfs(server, fhandle, fsstat),
3836 &exception);
3837 } while (exception.retry);
3838 return err;
3839}
3840
3841static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3842 struct nfs_fsinfo *fsinfo)
3843{
3844 struct nfs4_fsinfo_arg args = {
3845 .fh = fhandle,
3846 .bitmask = server->attr_bitmask,
3847 };
3848 struct nfs4_fsinfo_res res = {
3849 .fsinfo = fsinfo,
3850 };
3851 struct rpc_message msg = {
3852 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3853 .rpc_argp = &args,
3854 .rpc_resp = &res,
3855 };
3856
3857 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3858}
3859
3860static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3861{
3862 struct nfs4_exception exception = { };
3863 unsigned long now = jiffies;
3864 int err;
3865
3866 do {
3867 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
3868 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
3869 if (err == 0) {
3870 struct nfs_client *clp = server->nfs_client;
3871
3872 spin_lock(&clp->cl_lock);
3873 clp->cl_lease_time = fsinfo->lease_time * HZ;
3874 clp->cl_last_renewal = now;
3875 spin_unlock(&clp->cl_lock);
3876 break;
3877 }
3878 err = nfs4_handle_exception(server, err, &exception);
3879 } while (exception.retry);
3880 return err;
3881}
3882
3883static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3884{
3885 int error;
3886
3887 nfs_fattr_init(fsinfo->fattr);
3888 error = nfs4_do_fsinfo(server, fhandle, fsinfo);
3889 if (error == 0) {
3890 /* block layout checks this! */
3891 server->pnfs_blksize = fsinfo->blksize;
3892 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
3893 }
3894
3895 return error;
3896}
3897
3898static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3899 struct nfs_pathconf *pathconf)
3900{
3901 struct nfs4_pathconf_arg args = {
3902 .fh = fhandle,
3903 .bitmask = server->attr_bitmask,
3904 };
3905 struct nfs4_pathconf_res res = {
3906 .pathconf = pathconf,
3907 };
3908 struct rpc_message msg = {
3909 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3910 .rpc_argp = &args,
3911 .rpc_resp = &res,
3912 };
3913
3914 /* None of the pathconf attributes are mandatory to implement */
3915 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3916 memset(pathconf, 0, sizeof(*pathconf));
3917 return 0;
3918 }
3919
3920 nfs_fattr_init(pathconf->fattr);
3921 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3922}
3923
3924static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3925 struct nfs_pathconf *pathconf)
3926{
3927 struct nfs4_exception exception = { };
3928 int err;
3929
3930 do {
3931 err = nfs4_handle_exception(server,
3932 _nfs4_proc_pathconf(server, fhandle, pathconf),
3933 &exception);
3934 } while (exception.retry);
3935 return err;
3936}
3937
3938int nfs4_set_rw_stateid(nfs4_stateid *stateid,
3939 const struct nfs_open_context *ctx,
3940 const struct nfs_lock_context *l_ctx,
3941 fmode_t fmode)
3942{
3943 const struct nfs_lockowner *lockowner = NULL;
3944
3945 if (l_ctx != NULL)
3946 lockowner = &l_ctx->lockowner;
3947 return nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner);
3948}
3949EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
3950
3951static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
3952 const struct nfs_open_context *ctx,
3953 const struct nfs_lock_context *l_ctx,
3954 fmode_t fmode)
3955{
3956 nfs4_stateid current_stateid;
3957
3958 if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode))
3959 return false;
3960 return nfs4_stateid_match(stateid, &current_stateid);
3961}
3962
3963static bool nfs4_error_stateid_expired(int err)
3964{
3965 switch (err) {
3966 case -NFS4ERR_DELEG_REVOKED:
3967 case -NFS4ERR_ADMIN_REVOKED:
3968 case -NFS4ERR_BAD_STATEID:
3969 case -NFS4ERR_STALE_STATEID:
3970 case -NFS4ERR_OLD_STATEID:
3971 case -NFS4ERR_OPENMODE:
3972 case -NFS4ERR_EXPIRED:
3973 return true;
3974 }
3975 return false;
3976}
3977
3978void __nfs4_read_done_cb(struct nfs_read_data *data)
3979{
3980 nfs_invalidate_atime(data->header->inode);
3981}
3982
3983static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3984{
3985 struct nfs_server *server = NFS_SERVER(data->header->inode);
3986
3987 trace_nfs4_read(data, task->tk_status);
3988 if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3989 rpc_restart_call_prepare(task);
3990 return -EAGAIN;
3991 }
3992
3993 __nfs4_read_done_cb(data);
3994 if (task->tk_status > 0)
3995 renew_lease(server, data->timestamp);
3996 return 0;
3997}
3998
3999static bool nfs4_read_stateid_changed(struct rpc_task *task,
4000 struct nfs_readargs *args)
4001{
4002
4003 if (!nfs4_error_stateid_expired(task->tk_status) ||
4004 nfs4_stateid_is_current(&args->stateid,
4005 args->context,
4006 args->lock_context,
4007 FMODE_READ))
4008 return false;
4009 rpc_restart_call_prepare(task);
4010 return true;
4011}
4012
4013static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
4014{
4015
4016 dprintk("--> %s\n", __func__);
4017
4018 if (!nfs4_sequence_done(task, &data->res.seq_res))
4019 return -EAGAIN;
4020 if (nfs4_read_stateid_changed(task, &data->args))
4021 return -EAGAIN;
4022 return data->read_done_cb ? data->read_done_cb(task, data) :
4023 nfs4_read_done_cb(task, data);
4024}
4025
4026static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
4027{
4028 data->timestamp = jiffies;
4029 data->read_done_cb = nfs4_read_done_cb;
4030 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
4031 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
4032}
4033
4034static int nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
4035{
4036 if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
4037 &data->args.seq_args,
4038 &data->res.seq_res,
4039 task))
4040 return 0;
4041 if (nfs4_set_rw_stateid(&data->args.stateid, data->args.context,
4042 data->args.lock_context, FMODE_READ) == -EIO)
4043 return -EIO;
4044 if (unlikely(test_bit(NFS_CONTEXT_BAD, &data->args.context->flags)))
4045 return -EIO;
4046 return 0;
4047}
4048
4049static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
4050{
4051 struct inode *inode = data->header->inode;
4052
4053 trace_nfs4_write(data, task->tk_status);
4054 if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
4055 rpc_restart_call_prepare(task);
4056 return -EAGAIN;
4057 }
4058 if (task->tk_status >= 0) {
4059 renew_lease(NFS_SERVER(inode), data->timestamp);
4060 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4061 }
4062 return 0;
4063}
4064
4065static bool nfs4_write_stateid_changed(struct rpc_task *task,
4066 struct nfs_writeargs *args)
4067{
4068
4069 if (!nfs4_error_stateid_expired(task->tk_status) ||
4070 nfs4_stateid_is_current(&args->stateid,
4071 args->context,
4072 args->lock_context,
4073 FMODE_WRITE))
4074 return false;
4075 rpc_restart_call_prepare(task);
4076 return true;
4077}
4078
4079static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
4080{
4081 if (!nfs4_sequence_done(task, &data->res.seq_res))
4082 return -EAGAIN;
4083 if (nfs4_write_stateid_changed(task, &data->args))
4084 return -EAGAIN;
4085 return data->write_done_cb ? data->write_done_cb(task, data) :
4086 nfs4_write_done_cb(task, data);
4087}
4088
4089static
4090bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data)
4091{
4092 const struct nfs_pgio_header *hdr = data->header;
4093
4094 /* Don't request attributes for pNFS or O_DIRECT writes */
4095 if (data->ds_clp != NULL || hdr->dreq != NULL)
4096 return false;
4097 /* Otherwise, request attributes if and only if we don't hold
4098 * a delegation
4099 */
4100 return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
4101}
4102
4103static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
4104{
4105 struct nfs_server *server = NFS_SERVER(data->header->inode);
4106
4107 if (!nfs4_write_need_cache_consistency_data(data)) {
4108 data->args.bitmask = NULL;
4109 data->res.fattr = NULL;
4110 } else
4111 data->args.bitmask = server->cache_consistency_bitmask;
4112
4113 if (!data->write_done_cb)
4114 data->write_done_cb = nfs4_write_done_cb;
4115 data->res.server = server;
4116 data->timestamp = jiffies;
4117
4118 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
4119 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4120}
4121
4122static int nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
4123{
4124 if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
4125 &data->args.seq_args,
4126 &data->res.seq_res,
4127 task))
4128 return 0;
4129 if (nfs4_set_rw_stateid(&data->args.stateid, data->args.context,
4130 data->args.lock_context, FMODE_WRITE) == -EIO)
4131 return -EIO;
4132 if (unlikely(test_bit(NFS_CONTEXT_BAD, &data->args.context->flags)))
4133 return -EIO;
4134 return 0;
4135}
4136
4137static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
4138{
4139 nfs4_setup_sequence(NFS_SERVER(data->inode),
4140 &data->args.seq_args,
4141 &data->res.seq_res,
4142 task);
4143}
4144
4145static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
4146{
4147 struct inode *inode = data->inode;
4148
4149 trace_nfs4_commit(data, task->tk_status);
4150 if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
4151 rpc_restart_call_prepare(task);
4152 return -EAGAIN;
4153 }
4154 return 0;
4155}
4156
4157static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
4158{
4159 if (!nfs4_sequence_done(task, &data->res.seq_res))
4160 return -EAGAIN;
4161 return data->commit_done_cb(task, data);
4162}
4163
4164static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
4165{
4166 struct nfs_server *server = NFS_SERVER(data->inode);
4167
4168 if (data->commit_done_cb == NULL)
4169 data->commit_done_cb = nfs4_commit_done_cb;
4170 data->res.server = server;
4171 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
4172 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4173}
4174
4175struct nfs4_renewdata {
4176 struct nfs_client *client;
4177 unsigned long timestamp;
4178};
4179
4180/*
4181 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
4182 * standalone procedure for queueing an asynchronous RENEW.
4183 */
4184static void nfs4_renew_release(void *calldata)
4185{
4186 struct nfs4_renewdata *data = calldata;
4187 struct nfs_client *clp = data->client;
4188
4189 if (atomic_read(&clp->cl_count) > 1)
4190 nfs4_schedule_state_renewal(clp);
4191 nfs_put_client(clp);
4192 kfree(data);
4193}
4194
4195static void nfs4_renew_done(struct rpc_task *task, void *calldata)
4196{
4197 struct nfs4_renewdata *data = calldata;
4198 struct nfs_client *clp = data->client;
4199 unsigned long timestamp = data->timestamp;
4200
4201 trace_nfs4_renew_async(clp, task->tk_status);
4202 if (task->tk_status < 0) {
4203 /* Unless we're shutting down, schedule state recovery! */
4204 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
4205 return;
4206 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
4207 nfs4_schedule_lease_recovery(clp);
4208 return;
4209 }
4210 nfs4_schedule_path_down_recovery(clp);
4211 }
4212 do_renew_lease(clp, timestamp);
4213}
4214
4215static const struct rpc_call_ops nfs4_renew_ops = {
4216 .rpc_call_done = nfs4_renew_done,
4217 .rpc_release = nfs4_renew_release,
4218};
4219
4220static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
4221{
4222 struct rpc_message msg = {
4223 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4224 .rpc_argp = clp,
4225 .rpc_cred = cred,
4226 };
4227 struct nfs4_renewdata *data;
4228
4229 if (renew_flags == 0)
4230 return 0;
4231 if (!atomic_inc_not_zero(&clp->cl_count))
4232 return -EIO;
4233 data = kmalloc(sizeof(*data), GFP_NOFS);
4234 if (data == NULL)
4235 return -ENOMEM;
4236 data->client = clp;
4237 data->timestamp = jiffies;
4238 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
4239 &nfs4_renew_ops, data);
4240}
4241
4242static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
4243{
4244 struct rpc_message msg = {
4245 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4246 .rpc_argp = clp,
4247 .rpc_cred = cred,
4248 };
4249 unsigned long now = jiffies;
4250 int status;
4251
4252 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4253 if (status < 0)
4254 return status;
4255 do_renew_lease(clp, now);
4256 return 0;
4257}
4258
4259static inline int nfs4_server_supports_acls(struct nfs_server *server)
4260{
4261 return (server->caps & NFS_CAP_ACLS)
4262 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
4263 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
4264}
4265
4266/* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
4267 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
4268 * the stack.
4269 */
4270#define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
4271
4272static int buf_to_pages_noslab(const void *buf, size_t buflen,
4273 struct page **pages, unsigned int *pgbase)
4274{
4275 struct page *newpage, **spages;
4276 int rc = 0;
4277 size_t len;
4278 spages = pages;
4279
4280 do {
4281 len = min_t(size_t, PAGE_SIZE, buflen);
4282 newpage = alloc_page(GFP_KERNEL);
4283
4284 if (newpage == NULL)
4285 goto unwind;
4286 memcpy(page_address(newpage), buf, len);
4287 buf += len;
4288 buflen -= len;
4289 *pages++ = newpage;
4290 rc++;
4291 } while (buflen != 0);
4292
4293 return rc;
4294
4295unwind:
4296 for(; rc > 0; rc--)
4297 __free_page(spages[rc-1]);
4298 return -ENOMEM;
4299}
4300
4301struct nfs4_cached_acl {
4302 int cached;
4303 size_t len;
4304 char data[0];
4305};
4306
4307static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
4308{
4309 struct nfs_inode *nfsi = NFS_I(inode);
4310
4311 spin_lock(&inode->i_lock);
4312 kfree(nfsi->nfs4_acl);
4313 nfsi->nfs4_acl = acl;
4314 spin_unlock(&inode->i_lock);
4315}
4316
4317static void nfs4_zap_acl_attr(struct inode *inode)
4318{
4319 nfs4_set_cached_acl(inode, NULL);
4320}
4321
4322static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
4323{
4324 struct nfs_inode *nfsi = NFS_I(inode);
4325 struct nfs4_cached_acl *acl;
4326 int ret = -ENOENT;
4327
4328 spin_lock(&inode->i_lock);
4329 acl = nfsi->nfs4_acl;
4330 if (acl == NULL)
4331 goto out;
4332 if (buf == NULL) /* user is just asking for length */
4333 goto out_len;
4334 if (acl->cached == 0)
4335 goto out;
4336 ret = -ERANGE; /* see getxattr(2) man page */
4337 if (acl->len > buflen)
4338 goto out;
4339 memcpy(buf, acl->data, acl->len);
4340out_len:
4341 ret = acl->len;
4342out:
4343 spin_unlock(&inode->i_lock);
4344 return ret;
4345}
4346
4347static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
4348{
4349 struct nfs4_cached_acl *acl;
4350 size_t buflen = sizeof(*acl) + acl_len;
4351
4352 if (buflen <= PAGE_SIZE) {
4353 acl = kmalloc(buflen, GFP_KERNEL);
4354 if (acl == NULL)
4355 goto out;
4356 acl->cached = 1;
4357 _copy_from_pages(acl->data, pages, pgbase, acl_len);
4358 } else {
4359 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
4360 if (acl == NULL)
4361 goto out;
4362 acl->cached = 0;
4363 }
4364 acl->len = acl_len;
4365out:
4366 nfs4_set_cached_acl(inode, acl);
4367}
4368
4369/*
4370 * The getxattr API returns the required buffer length when called with a
4371 * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
4372 * the required buf. On a NULL buf, we send a page of data to the server
4373 * guessing that the ACL request can be serviced by a page. If so, we cache
4374 * up to the page of ACL data, and the 2nd call to getxattr is serviced by
4375 * the cache. If not so, we throw away the page, and cache the required
4376 * length. The next getxattr call will then produce another round trip to
4377 * the server, this time with the input buf of the required size.
4378 */
4379static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4380{
4381 struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
4382 struct nfs_getaclargs args = {
4383 .fh = NFS_FH(inode),
4384 .acl_pages = pages,
4385 .acl_len = buflen,
4386 };
4387 struct nfs_getaclres res = {
4388 .acl_len = buflen,
4389 };
4390 struct rpc_message msg = {
4391 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
4392 .rpc_argp = &args,
4393 .rpc_resp = &res,
4394 };
4395 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4396 int ret = -ENOMEM, i;
4397
4398 /* As long as we're doing a round trip to the server anyway,
4399 * let's be prepared for a page of acl data. */
4400 if (npages == 0)
4401 npages = 1;
4402 if (npages > ARRAY_SIZE(pages))
4403 return -ERANGE;
4404
4405 for (i = 0; i < npages; i++) {
4406 pages[i] = alloc_page(GFP_KERNEL);
4407 if (!pages[i])
4408 goto out_free;
4409 }
4410
4411 /* for decoding across pages */
4412 res.acl_scratch = alloc_page(GFP_KERNEL);
4413 if (!res.acl_scratch)
4414 goto out_free;
4415
4416 args.acl_len = npages * PAGE_SIZE;
4417 args.acl_pgbase = 0;
4418
4419 dprintk("%s buf %p buflen %zu npages %d args.acl_len %zu\n",
4420 __func__, buf, buflen, npages, args.acl_len);
4421 ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
4422 &msg, &args.seq_args, &res.seq_res, 0);
4423 if (ret)
4424 goto out_free;
4425
4426 /* Handle the case where the passed-in buffer is too short */
4427 if (res.acl_flags & NFS4_ACL_TRUNC) {
4428 /* Did the user only issue a request for the acl length? */
4429 if (buf == NULL)
4430 goto out_ok;
4431 ret = -ERANGE;
4432 goto out_free;
4433 }
4434 nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
4435 if (buf) {
4436 if (res.acl_len > buflen) {
4437 ret = -ERANGE;
4438 goto out_free;
4439 }
4440 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
4441 }
4442out_ok:
4443 ret = res.acl_len;
4444out_free:
4445 for (i = 0; i < npages; i++)
4446 if (pages[i])
4447 __free_page(pages[i]);
4448 if (res.acl_scratch)
4449 __free_page(res.acl_scratch);
4450 return ret;
4451}
4452
4453static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4454{
4455 struct nfs4_exception exception = { };
4456 ssize_t ret;
4457 do {
4458 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
4459 trace_nfs4_get_acl(inode, ret);
4460 if (ret >= 0)
4461 break;
4462 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
4463 } while (exception.retry);
4464 return ret;
4465}
4466
4467static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
4468{
4469 struct nfs_server *server = NFS_SERVER(inode);
4470 int ret;
4471
4472 if (!nfs4_server_supports_acls(server))
4473 return -EOPNOTSUPP;
4474 ret = nfs_revalidate_inode(server, inode);
4475 if (ret < 0)
4476 return ret;
4477 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
4478 nfs_zap_acl_cache(inode);
4479 ret = nfs4_read_cached_acl(inode, buf, buflen);
4480 if (ret != -ENOENT)
4481 /* -ENOENT is returned if there is no ACL or if there is an ACL
4482 * but no cached acl data, just the acl length */
4483 return ret;
4484 return nfs4_get_acl_uncached(inode, buf, buflen);
4485}
4486
4487static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4488{
4489 struct nfs_server *server = NFS_SERVER(inode);
4490 struct page *pages[NFS4ACL_MAXPAGES];
4491 struct nfs_setaclargs arg = {
4492 .fh = NFS_FH(inode),
4493 .acl_pages = pages,
4494 .acl_len = buflen,
4495 };
4496 struct nfs_setaclres res;
4497 struct rpc_message msg = {
4498 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
4499 .rpc_argp = &arg,
4500 .rpc_resp = &res,
4501 };
4502 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4503 int ret, i;
4504
4505 if (!nfs4_server_supports_acls(server))
4506 return -EOPNOTSUPP;
4507 if (npages > ARRAY_SIZE(pages))
4508 return -ERANGE;
4509 i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
4510 if (i < 0)
4511 return i;
4512 nfs4_inode_return_delegation(inode);
4513 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4514
4515 /*
4516 * Free each page after tx, so the only ref left is
4517 * held by the network stack
4518 */
4519 for (; i > 0; i--)
4520 put_page(pages[i-1]);
4521
4522 /*
4523 * Acl update can result in inode attribute update.
4524 * so mark the attribute cache invalid.
4525 */
4526 spin_lock(&inode->i_lock);
4527 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
4528 spin_unlock(&inode->i_lock);
4529 nfs_access_zap_cache(inode);
4530 nfs_zap_acl_cache(inode);
4531 return ret;
4532}
4533
4534static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4535{
4536 struct nfs4_exception exception = { };
4537 int err;
4538 do {
4539 err = __nfs4_proc_set_acl(inode, buf, buflen);
4540 trace_nfs4_set_acl(inode, err);
4541 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4542 &exception);
4543 } while (exception.retry);
4544 return err;
4545}
4546
4547#ifdef CONFIG_NFS_V4_SECURITY_LABEL
4548static int _nfs4_get_security_label(struct inode *inode, void *buf,
4549 size_t buflen)
4550{
4551 struct nfs_server *server = NFS_SERVER(inode);
4552 struct nfs_fattr fattr;
4553 struct nfs4_label label = {0, 0, buflen, buf};
4554
4555 u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4556 struct nfs4_getattr_arg args = {
4557 .fh = NFS_FH(inode),
4558 .bitmask = bitmask,
4559 };
4560 struct nfs4_getattr_res res = {
4561 .fattr = &fattr,
4562 .label = &label,
4563 .server = server,
4564 };
4565 struct rpc_message msg = {
4566 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4567 .rpc_argp = &args,
4568 .rpc_resp = &res,
4569 };
4570 int ret;
4571
4572 nfs_fattr_init(&fattr);
4573
4574 ret = rpc_call_sync(server->client, &msg, 0);
4575 if (ret)
4576 return ret;
4577 if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
4578 return -ENOENT;
4579 if (buflen < label.len)
4580 return -ERANGE;
4581 return 0;
4582}
4583
4584static int nfs4_get_security_label(struct inode *inode, void *buf,
4585 size_t buflen)
4586{
4587 struct nfs4_exception exception = { };
4588 int err;
4589
4590 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4591 return -EOPNOTSUPP;
4592
4593 do {
4594 err = _nfs4_get_security_label(inode, buf, buflen);
4595 trace_nfs4_get_security_label(inode, err);
4596 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4597 &exception);
4598 } while (exception.retry);
4599 return err;
4600}
4601
4602static int _nfs4_do_set_security_label(struct inode *inode,
4603 struct nfs4_label *ilabel,
4604 struct nfs_fattr *fattr,
4605 struct nfs4_label *olabel)
4606{
4607
4608 struct iattr sattr = {0};
4609 struct nfs_server *server = NFS_SERVER(inode);
4610 const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4611 struct nfs_setattrargs args = {
4612 .fh = NFS_FH(inode),
4613 .iap = &sattr,
4614 .server = server,
4615 .bitmask = bitmask,
4616 .label = ilabel,
4617 };
4618 struct nfs_setattrres res = {
4619 .fattr = fattr,
4620 .label = olabel,
4621 .server = server,
4622 };
4623 struct rpc_message msg = {
4624 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
4625 .rpc_argp = &args,
4626 .rpc_resp = &res,
4627 };
4628 int status;
4629
4630 nfs4_stateid_copy(&args.stateid, &zero_stateid);
4631
4632 status = rpc_call_sync(server->client, &msg, 0);
4633 if (status)
4634 dprintk("%s failed: %d\n", __func__, status);
4635
4636 return status;
4637}
4638
4639static int nfs4_do_set_security_label(struct inode *inode,
4640 struct nfs4_label *ilabel,
4641 struct nfs_fattr *fattr,
4642 struct nfs4_label *olabel)
4643{
4644 struct nfs4_exception exception = { };
4645 int err;
4646
4647 do {
4648 err = _nfs4_do_set_security_label(inode, ilabel,
4649 fattr, olabel);
4650 trace_nfs4_set_security_label(inode, err);
4651 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4652 &exception);
4653 } while (exception.retry);
4654 return err;
4655}
4656
4657static int
4658nfs4_set_security_label(struct dentry *dentry, const void *buf, size_t buflen)
4659{
4660 struct nfs4_label ilabel, *olabel = NULL;
4661 struct nfs_fattr fattr;
4662 struct rpc_cred *cred;
4663 struct inode *inode = dentry->d_inode;
4664 int status;
4665
4666 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4667 return -EOPNOTSUPP;
4668
4669 nfs_fattr_init(&fattr);
4670
4671 ilabel.pi = 0;
4672 ilabel.lfs = 0;
4673 ilabel.label = (char *)buf;
4674 ilabel.len = buflen;
4675
4676 cred = rpc_lookup_cred();
4677 if (IS_ERR(cred))
4678 return PTR_ERR(cred);
4679
4680 olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
4681 if (IS_ERR(olabel)) {
4682 status = -PTR_ERR(olabel);
4683 goto out;
4684 }
4685
4686 status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel);
4687 if (status == 0)
4688 nfs_setsecurity(inode, &fattr, olabel);
4689
4690 nfs4_label_free(olabel);
4691out:
4692 put_rpccred(cred);
4693 return status;
4694}
4695#endif /* CONFIG_NFS_V4_SECURITY_LABEL */
4696
4697
4698static int
4699nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
4700{
4701 struct nfs_client *clp = server->nfs_client;
4702
4703 if (task->tk_status >= 0)
4704 return 0;
4705 switch(task->tk_status) {
4706 case -NFS4ERR_DELEG_REVOKED:
4707 case -NFS4ERR_ADMIN_REVOKED:
4708 case -NFS4ERR_BAD_STATEID:
4709 if (state == NULL)
4710 break;
4711 nfs_remove_bad_delegation(state->inode);
4712 case -NFS4ERR_OPENMODE:
4713 if (state == NULL)
4714 break;
4715 if (nfs4_schedule_stateid_recovery(server, state) < 0)
4716 goto stateid_invalid;
4717 goto wait_on_recovery;
4718 case -NFS4ERR_EXPIRED:
4719 if (state != NULL) {
4720 if (nfs4_schedule_stateid_recovery(server, state) < 0)
4721 goto stateid_invalid;
4722 }
4723 case -NFS4ERR_STALE_STATEID:
4724 case -NFS4ERR_STALE_CLIENTID:
4725 nfs4_schedule_lease_recovery(clp);
4726 goto wait_on_recovery;
4727#if defined(CONFIG_NFS_V4_1)
4728 case -NFS4ERR_BADSESSION:
4729 case -NFS4ERR_BADSLOT:
4730 case -NFS4ERR_BAD_HIGH_SLOT:
4731 case -NFS4ERR_DEADSESSION:
4732 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4733 case -NFS4ERR_SEQ_FALSE_RETRY:
4734 case -NFS4ERR_SEQ_MISORDERED:
4735 dprintk("%s ERROR %d, Reset session\n", __func__,
4736 task->tk_status);
4737 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
4738 task->tk_status = 0;
4739 return -EAGAIN;
4740#endif /* CONFIG_NFS_V4_1 */
4741 case -NFS4ERR_DELAY:
4742 nfs_inc_server_stats(server, NFSIOS_DELAY);
4743 case -NFS4ERR_GRACE:
4744 rpc_delay(task, NFS4_POLL_RETRY_MAX);
4745 task->tk_status = 0;
4746 return -EAGAIN;
4747 case -NFS4ERR_RETRY_UNCACHED_REP:
4748 case -NFS4ERR_OLD_STATEID:
4749 task->tk_status = 0;
4750 return -EAGAIN;
4751 }
4752 task->tk_status = nfs4_map_errors(task->tk_status);
4753 return 0;
4754stateid_invalid:
4755 task->tk_status = -EIO;
4756 return 0;
4757wait_on_recovery:
4758 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
4759 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
4760 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
4761 task->tk_status = 0;
4762 return -EAGAIN;
4763}
4764
4765static void nfs4_init_boot_verifier(const struct nfs_client *clp,
4766 nfs4_verifier *bootverf)
4767{
4768 __be32 verf[2];
4769
4770 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
4771 /* An impossible timestamp guarantees this value
4772 * will never match a generated boot time. */
4773 verf[0] = 0;
4774 verf[1] = cpu_to_be32(NSEC_PER_SEC + 1);
4775 } else {
4776 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4777 verf[0] = cpu_to_be32(nn->boot_time.tv_sec);
4778 verf[1] = cpu_to_be32(nn->boot_time.tv_nsec);
4779 }
4780 memcpy(bootverf->data, verf, sizeof(bootverf->data));
4781}
4782
4783static unsigned int
4784nfs4_init_nonuniform_client_string(const struct nfs_client *clp,
4785 char *buf, size_t len)
4786{
4787 unsigned int result;
4788
4789 rcu_read_lock();
4790 result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4791 clp->cl_ipaddr,
4792 rpc_peeraddr2str(clp->cl_rpcclient,
4793 RPC_DISPLAY_ADDR),
4794 rpc_peeraddr2str(clp->cl_rpcclient,
4795 RPC_DISPLAY_PROTO));
4796 rcu_read_unlock();
4797 return result;
4798}
4799
4800static unsigned int
4801nfs4_init_uniform_client_string(const struct nfs_client *clp,
4802 char *buf, size_t len)
4803{
4804 const char *nodename = clp->cl_rpcclient->cl_nodename;
4805
4806 if (nfs4_client_id_uniquifier[0] != '\0')
4807 return scnprintf(buf, len, "Linux NFSv%u.%u %s/%s",
4808 clp->rpc_ops->version,
4809 clp->cl_minorversion,
4810 nfs4_client_id_uniquifier,
4811 nodename);
4812 return scnprintf(buf, len, "Linux NFSv%u.%u %s",
4813 clp->rpc_ops->version, clp->cl_minorversion,
4814 nodename);
4815}
4816
4817/**
4818 * nfs4_proc_setclientid - Negotiate client ID
4819 * @clp: state data structure
4820 * @program: RPC program for NFSv4 callback service
4821 * @port: IP port number for NFS4 callback service
4822 * @cred: RPC credential to use for this call
4823 * @res: where to place the result
4824 *
4825 * Returns zero, a negative errno, or a negative NFS4ERR status code.
4826 */
4827int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
4828 unsigned short port, struct rpc_cred *cred,
4829 struct nfs4_setclientid_res *res)
4830{
4831 nfs4_verifier sc_verifier;
4832 struct nfs4_setclientid setclientid = {
4833 .sc_verifier = &sc_verifier,
4834 .sc_prog = program,
4835 .sc_cb_ident = clp->cl_cb_ident,
4836 };
4837 struct rpc_message msg = {
4838 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
4839 .rpc_argp = &setclientid,
4840 .rpc_resp = res,
4841 .rpc_cred = cred,
4842 };
4843 int status;
4844
4845 /* nfs_client_id4 */
4846 nfs4_init_boot_verifier(clp, &sc_verifier);
4847 if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
4848 setclientid.sc_name_len =
4849 nfs4_init_uniform_client_string(clp,
4850 setclientid.sc_name,
4851 sizeof(setclientid.sc_name));
4852 else
4853 setclientid.sc_name_len =
4854 nfs4_init_nonuniform_client_string(clp,
4855 setclientid.sc_name,
4856 sizeof(setclientid.sc_name));
4857 /* cb_client4 */
4858 rcu_read_lock();
4859 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
4860 sizeof(setclientid.sc_netid), "%s",
4861 rpc_peeraddr2str(clp->cl_rpcclient,
4862 RPC_DISPLAY_NETID));
4863 rcu_read_unlock();
4864 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
4865 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
4866 clp->cl_ipaddr, port >> 8, port & 255);
4867
4868 dprintk("NFS call setclientid auth=%s, '%.*s'\n",
4869 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4870 setclientid.sc_name_len, setclientid.sc_name);
4871 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4872 trace_nfs4_setclientid(clp, status);
4873 dprintk("NFS reply setclientid: %d\n", status);
4874 return status;
4875}
4876
4877/**
4878 * nfs4_proc_setclientid_confirm - Confirm client ID
4879 * @clp: state data structure
4880 * @res: result of a previous SETCLIENTID
4881 * @cred: RPC credential to use for this call
4882 *
4883 * Returns zero, a negative errno, or a negative NFS4ERR status code.
4884 */
4885int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
4886 struct nfs4_setclientid_res *arg,
4887 struct rpc_cred *cred)
4888{
4889 struct rpc_message msg = {
4890 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4891 .rpc_argp = arg,
4892 .rpc_cred = cred,
4893 };
4894 int status;
4895
4896 dprintk("NFS call setclientid_confirm auth=%s, (client ID %llx)\n",
4897 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4898 clp->cl_clientid);
4899 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4900 trace_nfs4_setclientid_confirm(clp, status);
4901 dprintk("NFS reply setclientid_confirm: %d\n", status);
4902 return status;
4903}
4904
4905struct nfs4_delegreturndata {
4906 struct nfs4_delegreturnargs args;
4907 struct nfs4_delegreturnres res;
4908 struct nfs_fh fh;
4909 nfs4_stateid stateid;
4910 unsigned long timestamp;
4911 struct nfs_fattr fattr;
4912 int rpc_status;
4913};
4914
4915static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4916{
4917 struct nfs4_delegreturndata *data = calldata;
4918
4919 if (!nfs4_sequence_done(task, &data->res.seq_res))
4920 return;
4921
4922 trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
4923 switch (task->tk_status) {
4924 case -NFS4ERR_STALE_STATEID:
4925 case -NFS4ERR_EXPIRED:
4926 case 0:
4927 renew_lease(data->res.server, data->timestamp);
4928 break;
4929 default:
4930 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
4931 -EAGAIN) {
4932 rpc_restart_call_prepare(task);
4933 return;
4934 }
4935 }
4936 data->rpc_status = task->tk_status;
4937}
4938
4939static void nfs4_delegreturn_release(void *calldata)
4940{
4941 kfree(calldata);
4942}
4943
4944static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
4945{
4946 struct nfs4_delegreturndata *d_data;
4947
4948 d_data = (struct nfs4_delegreturndata *)data;
4949
4950 nfs4_setup_sequence(d_data->res.server,
4951 &d_data->args.seq_args,
4952 &d_data->res.seq_res,
4953 task);
4954}
4955
4956static const struct rpc_call_ops nfs4_delegreturn_ops = {
4957 .rpc_call_prepare = nfs4_delegreturn_prepare,
4958 .rpc_call_done = nfs4_delegreturn_done,
4959 .rpc_release = nfs4_delegreturn_release,
4960};
4961
4962static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4963{
4964 struct nfs4_delegreturndata *data;
4965 struct nfs_server *server = NFS_SERVER(inode);
4966 struct rpc_task *task;
4967 struct rpc_message msg = {
4968 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
4969 .rpc_cred = cred,
4970 };
4971 struct rpc_task_setup task_setup_data = {
4972 .rpc_client = server->client,
4973 .rpc_message = &msg,
4974 .callback_ops = &nfs4_delegreturn_ops,
4975 .flags = RPC_TASK_ASYNC,
4976 };
4977 int status = 0;
4978
4979 data = kzalloc(sizeof(*data), GFP_NOFS);
4980 if (data == NULL)
4981 return -ENOMEM;
4982 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4983 data->args.fhandle = &data->fh;
4984 data->args.stateid = &data->stateid;
4985 data->args.bitmask = server->cache_consistency_bitmask;
4986 nfs_copy_fh(&data->fh, NFS_FH(inode));
4987 nfs4_stateid_copy(&data->stateid, stateid);
4988 data->res.fattr = &data->fattr;
4989 data->res.server = server;
4990 nfs_fattr_init(data->res.fattr);
4991 data->timestamp = jiffies;
4992 data->rpc_status = 0;
4993
4994 task_setup_data.callback_data = data;
4995 msg.rpc_argp = &data->args;
4996 msg.rpc_resp = &data->res;
4997 task = rpc_run_task(&task_setup_data);
4998 if (IS_ERR(task))
4999 return PTR_ERR(task);
5000 if (!issync)
5001 goto out;
5002 status = nfs4_wait_for_completion_rpc_task(task);
5003 if (status != 0)
5004 goto out;
5005 status = data->rpc_status;
5006 if (status == 0)
5007 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
5008 else
5009 nfs_refresh_inode(inode, &data->fattr);
5010out:
5011 rpc_put_task(task);
5012 return status;
5013}
5014
5015int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5016{
5017 struct nfs_server *server = NFS_SERVER(inode);
5018 struct nfs4_exception exception = { };
5019 int err;
5020 do {
5021 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
5022 trace_nfs4_delegreturn(inode, err);
5023 switch (err) {
5024 case -NFS4ERR_STALE_STATEID:
5025 case -NFS4ERR_EXPIRED:
5026 case 0:
5027 return 0;
5028 }
5029 err = nfs4_handle_exception(server, err, &exception);
5030 } while (exception.retry);
5031 return err;
5032}
5033
5034#define NFS4_LOCK_MINTIMEOUT (1 * HZ)
5035#define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
5036
5037/*
5038 * sleep, with exponential backoff, and retry the LOCK operation.
5039 */
5040static unsigned long
5041nfs4_set_lock_task_retry(unsigned long timeout)
5042{
5043 freezable_schedule_timeout_killable_unsafe(timeout);
5044 timeout <<= 1;
5045 if (timeout > NFS4_LOCK_MAXTIMEOUT)
5046 return NFS4_LOCK_MAXTIMEOUT;
5047 return timeout;
5048}
5049
5050static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5051{
5052 struct inode *inode = state->inode;
5053 struct nfs_server *server = NFS_SERVER(inode);
5054 struct nfs_client *clp = server->nfs_client;
5055 struct nfs_lockt_args arg = {
5056 .fh = NFS_FH(inode),
5057 .fl = request,
5058 };
5059 struct nfs_lockt_res res = {
5060 .denied = request,
5061 };
5062 struct rpc_message msg = {
5063 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
5064 .rpc_argp = &arg,
5065 .rpc_resp = &res,
5066 .rpc_cred = state->owner->so_cred,
5067 };
5068 struct nfs4_lock_state *lsp;
5069 int status;
5070
5071 arg.lock_owner.clientid = clp->cl_clientid;
5072 status = nfs4_set_lock_state(state, request);
5073 if (status != 0)
5074 goto out;
5075 lsp = request->fl_u.nfs4_fl.owner;
5076 arg.lock_owner.id = lsp->ls_seqid.owner_id;
5077 arg.lock_owner.s_dev = server->s_dev;
5078 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5079 switch (status) {
5080 case 0:
5081 request->fl_type = F_UNLCK;
5082 break;
5083 case -NFS4ERR_DENIED:
5084 status = 0;
5085 }
5086 request->fl_ops->fl_release_private(request);
5087out:
5088 return status;
5089}
5090
5091static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5092{
5093 struct nfs4_exception exception = { };
5094 int err;
5095
5096 do {
5097 err = _nfs4_proc_getlk(state, cmd, request);
5098 trace_nfs4_get_lock(request, state, cmd, err);
5099 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
5100 &exception);
5101 } while (exception.retry);
5102 return err;
5103}
5104
5105static int do_vfs_lock(struct file *file, struct file_lock *fl)
5106{
5107 int res = 0;
5108 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
5109 case FL_POSIX:
5110 res = posix_lock_file_wait(file, fl);
5111 break;
5112 case FL_FLOCK:
5113 res = flock_lock_file_wait(file, fl);
5114 break;
5115 default:
5116 BUG();
5117 }
5118 return res;
5119}
5120
5121struct nfs4_unlockdata {
5122 struct nfs_locku_args arg;
5123 struct nfs_locku_res res;
5124 struct nfs4_lock_state *lsp;
5125 struct nfs_open_context *ctx;
5126 struct file_lock fl;
5127 const struct nfs_server *server;
5128 unsigned long timestamp;
5129};
5130
5131static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
5132 struct nfs_open_context *ctx,
5133 struct nfs4_lock_state *lsp,
5134 struct nfs_seqid *seqid)
5135{
5136 struct nfs4_unlockdata *p;
5137 struct inode *inode = lsp->ls_state->inode;
5138
5139 p = kzalloc(sizeof(*p), GFP_NOFS);
5140 if (p == NULL)
5141 return NULL;
5142 p->arg.fh = NFS_FH(inode);
5143 p->arg.fl = &p->fl;
5144 p->arg.seqid = seqid;
5145 p->res.seqid = seqid;
5146 p->arg.stateid = &lsp->ls_stateid;
5147 p->lsp = lsp;
5148 atomic_inc(&lsp->ls_count);
5149 /* Ensure we don't close file until we're done freeing locks! */
5150 p->ctx = get_nfs_open_context(ctx);
5151 memcpy(&p->fl, fl, sizeof(p->fl));
5152 p->server = NFS_SERVER(inode);
5153 return p;
5154}
5155
5156static void nfs4_locku_release_calldata(void *data)
5157{
5158 struct nfs4_unlockdata *calldata = data;
5159 nfs_free_seqid(calldata->arg.seqid);
5160 nfs4_put_lock_state(calldata->lsp);
5161 put_nfs_open_context(calldata->ctx);
5162 kfree(calldata);
5163}
5164
5165static void nfs4_locku_done(struct rpc_task *task, void *data)
5166{
5167 struct nfs4_unlockdata *calldata = data;
5168
5169 if (!nfs4_sequence_done(task, &calldata->res.seq_res))
5170 return;
5171 switch (task->tk_status) {
5172 case 0:
5173 nfs4_stateid_copy(&calldata->lsp->ls_stateid,
5174 &calldata->res.stateid);
5175 renew_lease(calldata->server, calldata->timestamp);
5176 break;
5177 case -NFS4ERR_BAD_STATEID:
5178 case -NFS4ERR_OLD_STATEID:
5179 case -NFS4ERR_STALE_STATEID:
5180 case -NFS4ERR_EXPIRED:
5181 break;
5182 default:
5183 if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
5184 rpc_restart_call_prepare(task);
5185 }
5186 nfs_release_seqid(calldata->arg.seqid);
5187}
5188
5189static void nfs4_locku_prepare(struct rpc_task *task, void *data)
5190{
5191 struct nfs4_unlockdata *calldata = data;
5192
5193 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
5194 goto out_wait;
5195 if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
5196 /* Note: exit _without_ running nfs4_locku_done */
5197 goto out_no_action;
5198 }
5199 calldata->timestamp = jiffies;
5200 if (nfs4_setup_sequence(calldata->server,
5201 &calldata->arg.seq_args,
5202 &calldata->res.seq_res,
5203 task) != 0)
5204 nfs_release_seqid(calldata->arg.seqid);
5205 return;
5206out_no_action:
5207 task->tk_action = NULL;
5208out_wait:
5209 nfs4_sequence_done(task, &calldata->res.seq_res);
5210}
5211
5212static const struct rpc_call_ops nfs4_locku_ops = {
5213 .rpc_call_prepare = nfs4_locku_prepare,
5214 .rpc_call_done = nfs4_locku_done,
5215 .rpc_release = nfs4_locku_release_calldata,
5216};
5217
5218static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
5219 struct nfs_open_context *ctx,
5220 struct nfs4_lock_state *lsp,
5221 struct nfs_seqid *seqid)
5222{
5223 struct nfs4_unlockdata *data;
5224 struct rpc_message msg = {
5225 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
5226 .rpc_cred = ctx->cred,
5227 };
5228 struct rpc_task_setup task_setup_data = {
5229 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
5230 .rpc_message = &msg,
5231 .callback_ops = &nfs4_locku_ops,
5232 .workqueue = nfsiod_workqueue,
5233 .flags = RPC_TASK_ASYNC,
5234 };
5235
5236 nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
5237 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
5238
5239 /* Ensure this is an unlock - when canceling a lock, the
5240 * canceled lock is passed in, and it won't be an unlock.
5241 */
5242 fl->fl_type = F_UNLCK;
5243
5244 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
5245 if (data == NULL) {
5246 nfs_free_seqid(seqid);
5247 return ERR_PTR(-ENOMEM);
5248 }
5249
5250 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5251 msg.rpc_argp = &data->arg;
5252 msg.rpc_resp = &data->res;
5253 task_setup_data.callback_data = data;
5254 return rpc_run_task(&task_setup_data);
5255}
5256
5257static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
5258{
5259 struct inode *inode = state->inode;
5260 struct nfs4_state_owner *sp = state->owner;
5261 struct nfs_inode *nfsi = NFS_I(inode);
5262 struct nfs_seqid *seqid;
5263 struct nfs4_lock_state *lsp;
5264 struct rpc_task *task;
5265 int status = 0;
5266 unsigned char fl_flags = request->fl_flags;
5267
5268 status = nfs4_set_lock_state(state, request);
5269 /* Unlock _before_ we do the RPC call */
5270 request->fl_flags |= FL_EXISTS;
5271 /* Exclude nfs_delegation_claim_locks() */
5272 mutex_lock(&sp->so_delegreturn_mutex);
5273 /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
5274 down_read(&nfsi->rwsem);
5275 if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
5276 up_read(&nfsi->rwsem);
5277 mutex_unlock(&sp->so_delegreturn_mutex);
5278 goto out;
5279 }
5280 up_read(&nfsi->rwsem);
5281 mutex_unlock(&sp->so_delegreturn_mutex);
5282 if (status != 0)
5283 goto out;
5284 /* Is this a delegated lock? */
5285 lsp = request->fl_u.nfs4_fl.owner;
5286 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
5287 goto out;
5288 seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
5289 status = -ENOMEM;
5290 if (seqid == NULL)
5291 goto out;
5292 task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
5293 status = PTR_ERR(task);
5294 if (IS_ERR(task))
5295 goto out;
5296 status = nfs4_wait_for_completion_rpc_task(task);
5297 rpc_put_task(task);
5298out:
5299 request->fl_flags = fl_flags;
5300 trace_nfs4_unlock(request, state, F_SETLK, status);
5301 return status;
5302}
5303
5304struct nfs4_lockdata {
5305 struct nfs_lock_args arg;
5306 struct nfs_lock_res res;
5307 struct nfs4_lock_state *lsp;
5308 struct nfs_open_context *ctx;
5309 struct file_lock fl;
5310 unsigned long timestamp;
5311 int rpc_status;
5312 int cancelled;
5313 struct nfs_server *server;
5314};
5315
5316static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
5317 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
5318 gfp_t gfp_mask)
5319{
5320 struct nfs4_lockdata *p;
5321 struct inode *inode = lsp->ls_state->inode;
5322 struct nfs_server *server = NFS_SERVER(inode);
5323
5324 p = kzalloc(sizeof(*p), gfp_mask);
5325 if (p == NULL)
5326 return NULL;
5327
5328 p->arg.fh = NFS_FH(inode);
5329 p->arg.fl = &p->fl;
5330 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
5331 if (p->arg.open_seqid == NULL)
5332 goto out_free;
5333 p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
5334 if (p->arg.lock_seqid == NULL)
5335 goto out_free_seqid;
5336 p->arg.lock_stateid = &lsp->ls_stateid;
5337 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
5338 p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
5339 p->arg.lock_owner.s_dev = server->s_dev;
5340 p->res.lock_seqid = p->arg.lock_seqid;
5341 p->lsp = lsp;
5342 p->server = server;
5343 atomic_inc(&lsp->ls_count);
5344 p->ctx = get_nfs_open_context(ctx);
5345 memcpy(&p->fl, fl, sizeof(p->fl));
5346 return p;
5347out_free_seqid:
5348 nfs_free_seqid(p->arg.open_seqid);
5349out_free:
5350 kfree(p);
5351 return NULL;
5352}
5353
5354static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
5355{
5356 struct nfs4_lockdata *data = calldata;
5357 struct nfs4_state *state = data->lsp->ls_state;
5358
5359 dprintk("%s: begin!\n", __func__);
5360 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
5361 goto out_wait;
5362 /* Do we need to do an open_to_lock_owner? */
5363 if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
5364 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
5365 goto out_release_lock_seqid;
5366 }
5367 data->arg.open_stateid = &state->open_stateid;
5368 data->arg.new_lock_owner = 1;
5369 data->res.open_seqid = data->arg.open_seqid;
5370 } else
5371 data->arg.new_lock_owner = 0;
5372 if (!nfs4_valid_open_stateid(state)) {
5373 data->rpc_status = -EBADF;
5374 task->tk_action = NULL;
5375 goto out_release_open_seqid;
5376 }
5377 data->timestamp = jiffies;
5378 if (nfs4_setup_sequence(data->server,
5379 &data->arg.seq_args,
5380 &data->res.seq_res,
5381 task) == 0)
5382 return;
5383out_release_open_seqid:
5384 nfs_release_seqid(data->arg.open_seqid);
5385out_release_lock_seqid:
5386 nfs_release_seqid(data->arg.lock_seqid);
5387out_wait:
5388 nfs4_sequence_done(task, &data->res.seq_res);
5389 dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
5390}
5391
5392static void nfs4_lock_done(struct rpc_task *task, void *calldata)
5393{
5394 struct nfs4_lockdata *data = calldata;
5395
5396 dprintk("%s: begin!\n", __func__);
5397
5398 if (!nfs4_sequence_done(task, &data->res.seq_res))
5399 return;
5400
5401 data->rpc_status = task->tk_status;
5402 if (data->arg.new_lock_owner != 0) {
5403 if (data->rpc_status == 0)
5404 nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
5405 else
5406 goto out;
5407 }
5408 if (data->rpc_status == 0) {
5409 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
5410 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags);
5411 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
5412 }
5413out:
5414 dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
5415}
5416
5417static void nfs4_lock_release(void *calldata)
5418{
5419 struct nfs4_lockdata *data = calldata;
5420
5421 dprintk("%s: begin!\n", __func__);
5422 nfs_free_seqid(data->arg.open_seqid);
5423 if (data->cancelled != 0) {
5424 struct rpc_task *task;
5425 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
5426 data->arg.lock_seqid);
5427 if (!IS_ERR(task))
5428 rpc_put_task_async(task);
5429 dprintk("%s: cancelling lock!\n", __func__);
5430 } else
5431 nfs_free_seqid(data->arg.lock_seqid);
5432 nfs4_put_lock_state(data->lsp);
5433 put_nfs_open_context(data->ctx);
5434 kfree(data);
5435 dprintk("%s: done!\n", __func__);
5436}
5437
5438static const struct rpc_call_ops nfs4_lock_ops = {
5439 .rpc_call_prepare = nfs4_lock_prepare,
5440 .rpc_call_done = nfs4_lock_done,
5441 .rpc_release = nfs4_lock_release,
5442};
5443
5444static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
5445{
5446 switch (error) {
5447 case -NFS4ERR_ADMIN_REVOKED:
5448 case -NFS4ERR_BAD_STATEID:
5449 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5450 if (new_lock_owner != 0 ||
5451 test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
5452 nfs4_schedule_stateid_recovery(server, lsp->ls_state);
5453 break;
5454 case -NFS4ERR_STALE_STATEID:
5455 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5456 case -NFS4ERR_EXPIRED:
5457 nfs4_schedule_lease_recovery(server->nfs_client);
5458 };
5459}
5460
5461static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
5462{
5463 struct nfs4_lockdata *data;
5464 struct rpc_task *task;
5465 struct rpc_message msg = {
5466 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
5467 .rpc_cred = state->owner->so_cred,
5468 };
5469 struct rpc_task_setup task_setup_data = {
5470 .rpc_client = NFS_CLIENT(state->inode),
5471 .rpc_message = &msg,
5472 .callback_ops = &nfs4_lock_ops,
5473 .workqueue = nfsiod_workqueue,
5474 .flags = RPC_TASK_ASYNC,
5475 };
5476 int ret;
5477
5478 dprintk("%s: begin!\n", __func__);
5479 data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
5480 fl->fl_u.nfs4_fl.owner,
5481 recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
5482 if (data == NULL)
5483 return -ENOMEM;
5484 if (IS_SETLKW(cmd))
5485 data->arg.block = 1;
5486 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5487 msg.rpc_argp = &data->arg;
5488 msg.rpc_resp = &data->res;
5489 task_setup_data.callback_data = data;
5490 if (recovery_type > NFS_LOCK_NEW) {
5491 if (recovery_type == NFS_LOCK_RECLAIM)
5492 data->arg.reclaim = NFS_LOCK_RECLAIM;
5493 nfs4_set_sequence_privileged(&data->arg.seq_args);
5494 }
5495 task = rpc_run_task(&task_setup_data);
5496 if (IS_ERR(task))
5497 return PTR_ERR(task);
5498 ret = nfs4_wait_for_completion_rpc_task(task);
5499 if (ret == 0) {
5500 ret = data->rpc_status;
5501 if (ret)
5502 nfs4_handle_setlk_error(data->server, data->lsp,
5503 data->arg.new_lock_owner, ret);
5504 } else
5505 data->cancelled = 1;
5506 rpc_put_task(task);
5507 dprintk("%s: done, ret = %d!\n", __func__, ret);
5508 return ret;
5509}
5510
5511static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
5512{
5513 struct nfs_server *server = NFS_SERVER(state->inode);
5514 struct nfs4_exception exception = {
5515 .inode = state->inode,
5516 };
5517 int err;
5518
5519 do {
5520 /* Cache the lock if possible... */
5521 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5522 return 0;
5523 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
5524 trace_nfs4_lock_reclaim(request, state, F_SETLK, err);
5525 if (err != -NFS4ERR_DELAY)
5526 break;
5527 nfs4_handle_exception(server, err, &exception);
5528 } while (exception.retry);
5529 return err;
5530}
5531
5532static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
5533{
5534 struct nfs_server *server = NFS_SERVER(state->inode);
5535 struct nfs4_exception exception = {
5536 .inode = state->inode,
5537 };
5538 int err;
5539
5540 err = nfs4_set_lock_state(state, request);
5541 if (err != 0)
5542 return err;
5543 if (!recover_lost_locks) {
5544 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
5545 return 0;
5546 }
5547 do {
5548 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5549 return 0;
5550 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
5551 trace_nfs4_lock_expired(request, state, F_SETLK, err);
5552 switch (err) {
5553 default:
5554 goto out;
5555 case -NFS4ERR_GRACE:
5556 case -NFS4ERR_DELAY:
5557 nfs4_handle_exception(server, err, &exception);
5558 err = 0;
5559 }
5560 } while (exception.retry);
5561out:
5562 return err;
5563}
5564
5565#if defined(CONFIG_NFS_V4_1)
5566/**
5567 * nfs41_check_expired_locks - possibly free a lock stateid
5568 *
5569 * @state: NFSv4 state for an inode
5570 *
5571 * Returns NFS_OK if recovery for this stateid is now finished.
5572 * Otherwise a negative NFS4ERR value is returned.
5573 */
5574static int nfs41_check_expired_locks(struct nfs4_state *state)
5575{
5576 int status, ret = -NFS4ERR_BAD_STATEID;
5577 struct nfs4_lock_state *lsp;
5578 struct nfs_server *server = NFS_SERVER(state->inode);
5579
5580 list_for_each_entry(lsp, &state->lock_states, ls_locks) {
5581 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
5582 struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
5583
5584 status = nfs41_test_stateid(server,
5585 &lsp->ls_stateid,
5586 cred);
5587 trace_nfs4_test_lock_stateid(state, lsp, status);
5588 if (status != NFS_OK) {
5589 /* Free the stateid unless the server
5590 * informs us the stateid is unrecognized. */
5591 if (status != -NFS4ERR_BAD_STATEID)
5592 nfs41_free_stateid(server,
5593 &lsp->ls_stateid,
5594 cred);
5595 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
5596 ret = status;
5597 }
5598 }
5599 };
5600
5601 return ret;
5602}
5603
5604static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
5605{
5606 int status = NFS_OK;
5607
5608 if (test_bit(LK_STATE_IN_USE, &state->flags))
5609 status = nfs41_check_expired_locks(state);
5610 if (status != NFS_OK)
5611 status = nfs4_lock_expired(state, request);
5612 return status;
5613}
5614#endif
5615
5616static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5617{
5618 struct nfs4_state_owner *sp = state->owner;
5619 struct nfs_inode *nfsi = NFS_I(state->inode);
5620 unsigned char fl_flags = request->fl_flags;
5621 unsigned int seq;
5622 int status = -ENOLCK;
5623
5624 if ((fl_flags & FL_POSIX) &&
5625 !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
5626 goto out;
5627 /* Is this a delegated open? */
5628 status = nfs4_set_lock_state(state, request);
5629 if (status != 0)
5630 goto out;
5631 request->fl_flags |= FL_ACCESS;
5632 status = do_vfs_lock(request->fl_file, request);
5633 if (status < 0)
5634 goto out;
5635 down_read(&nfsi->rwsem);
5636 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
5637 /* Yes: cache locks! */
5638 /* ...but avoid races with delegation recall... */
5639 request->fl_flags = fl_flags & ~FL_SLEEP;
5640 status = do_vfs_lock(request->fl_file, request);
5641 goto out_unlock;
5642 }
5643 seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
5644 up_read(&nfsi->rwsem);
5645 status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
5646 if (status != 0)
5647 goto out;
5648 down_read(&nfsi->rwsem);
5649 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) {
5650 status = -NFS4ERR_DELAY;
5651 goto out_unlock;
5652 }
5653 /* Note: we always want to sleep here! */
5654 request->fl_flags = fl_flags | FL_SLEEP;
5655 if (do_vfs_lock(request->fl_file, request) < 0)
5656 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
5657 "manager!\n", __func__);
5658out_unlock:
5659 up_read(&nfsi->rwsem);
5660out:
5661 request->fl_flags = fl_flags;
5662 return status;
5663}
5664
5665static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5666{
5667 struct nfs4_exception exception = {
5668 .state = state,
5669 .inode = state->inode,
5670 };
5671 int err;
5672
5673 do {
5674 err = _nfs4_proc_setlk(state, cmd, request);
5675 trace_nfs4_set_lock(request, state, cmd, err);
5676 if (err == -NFS4ERR_DENIED)
5677 err = -EAGAIN;
5678 err = nfs4_handle_exception(NFS_SERVER(state->inode),
5679 err, &exception);
5680 } while (exception.retry);
5681 return err;
5682}
5683
5684static int
5685nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
5686{
5687 struct nfs_open_context *ctx;
5688 struct nfs4_state *state;
5689 unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
5690 int status;
5691
5692 /* verify open state */
5693 ctx = nfs_file_open_context(filp);
5694 state = ctx->state;
5695
5696 if (request->fl_start < 0 || request->fl_end < 0)
5697 return -EINVAL;
5698
5699 if (IS_GETLK(cmd)) {
5700 if (state != NULL)
5701 return nfs4_proc_getlk(state, F_GETLK, request);
5702 return 0;
5703 }
5704
5705 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
5706 return -EINVAL;
5707
5708 if (request->fl_type == F_UNLCK) {
5709 if (state != NULL)
5710 return nfs4_proc_unlck(state, cmd, request);
5711 return 0;
5712 }
5713
5714 if (state == NULL)
5715 return -ENOLCK;
5716 /*
5717 * Don't rely on the VFS having checked the file open mode,
5718 * since it won't do this for flock() locks.
5719 */
5720 switch (request->fl_type) {
5721 case F_RDLCK:
5722 if (!(filp->f_mode & FMODE_READ))
5723 return -EBADF;
5724 break;
5725 case F_WRLCK:
5726 if (!(filp->f_mode & FMODE_WRITE))
5727 return -EBADF;
5728 }
5729
5730 do {
5731 status = nfs4_proc_setlk(state, cmd, request);
5732 if ((status != -EAGAIN) || IS_SETLK(cmd))
5733 break;
5734 timeout = nfs4_set_lock_task_retry(timeout);
5735 status = -ERESTARTSYS;
5736 if (signalled())
5737 break;
5738 } while(status < 0);
5739 return status;
5740}
5741
5742int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
5743{
5744 struct nfs_server *server = NFS_SERVER(state->inode);
5745 int err;
5746
5747 err = nfs4_set_lock_state(state, fl);
5748 if (err != 0)
5749 return err;
5750 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
5751 return nfs4_handle_delegation_recall_error(server, state, stateid, err);
5752}
5753
5754struct nfs_release_lockowner_data {
5755 struct nfs4_lock_state *lsp;
5756 struct nfs_server *server;
5757 struct nfs_release_lockowner_args args;
5758 struct nfs4_sequence_args seq_args;
5759 struct nfs4_sequence_res seq_res;
5760};
5761
5762static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
5763{
5764 struct nfs_release_lockowner_data *data = calldata;
5765 nfs40_setup_sequence(data->server,
5766 &data->seq_args, &data->seq_res, task);
5767}
5768
5769static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
5770{
5771 struct nfs_release_lockowner_data *data = calldata;
5772 nfs40_sequence_done(task, &data->seq_res);
5773}
5774
5775static void nfs4_release_lockowner_release(void *calldata)
5776{
5777 struct nfs_release_lockowner_data *data = calldata;
5778 nfs4_free_lock_state(data->server, data->lsp);
5779 kfree(calldata);
5780}
5781
5782static const struct rpc_call_ops nfs4_release_lockowner_ops = {
5783 .rpc_call_prepare = nfs4_release_lockowner_prepare,
5784 .rpc_call_done = nfs4_release_lockowner_done,
5785 .rpc_release = nfs4_release_lockowner_release,
5786};
5787
5788static int nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
5789{
5790 struct nfs_release_lockowner_data *data;
5791 struct rpc_message msg = {
5792 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
5793 };
5794
5795 if (server->nfs_client->cl_mvops->minor_version != 0)
5796 return -EINVAL;
5797
5798 data = kmalloc(sizeof(*data), GFP_NOFS);
5799 if (!data)
5800 return -ENOMEM;
5801 nfs4_init_sequence(&data->seq_args, &data->seq_res, 0);
5802 data->lsp = lsp;
5803 data->server = server;
5804 data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
5805 data->args.lock_owner.id = lsp->ls_seqid.owner_id;
5806 data->args.lock_owner.s_dev = server->s_dev;
5807
5808 msg.rpc_argp = &data->args;
5809 rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
5810 return 0;
5811}
5812
5813#define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
5814
5815static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
5816 const void *buf, size_t buflen,
5817 int flags, int type)
5818{
5819 if (strcmp(key, "") != 0)
5820 return -EINVAL;
5821
5822 return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
5823}
5824
5825static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
5826 void *buf, size_t buflen, int type)
5827{
5828 if (strcmp(key, "") != 0)
5829 return -EINVAL;
5830
5831 return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
5832}
5833
5834static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
5835 size_t list_len, const char *name,
5836 size_t name_len, int type)
5837{
5838 size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
5839
5840 if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
5841 return 0;
5842
5843 if (list && len <= list_len)
5844 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
5845 return len;
5846}
5847
5848#ifdef CONFIG_NFS_V4_SECURITY_LABEL
5849static inline int nfs4_server_supports_labels(struct nfs_server *server)
5850{
5851 return server->caps & NFS_CAP_SECURITY_LABEL;
5852}
5853
5854static int nfs4_xattr_set_nfs4_label(struct dentry *dentry, const char *key,
5855 const void *buf, size_t buflen,
5856 int flags, int type)
5857{
5858 if (security_ismaclabel(key))
5859 return nfs4_set_security_label(dentry, buf, buflen);
5860
5861 return -EOPNOTSUPP;
5862}
5863
5864static int nfs4_xattr_get_nfs4_label(struct dentry *dentry, const char *key,
5865 void *buf, size_t buflen, int type)
5866{
5867 if (security_ismaclabel(key))
5868 return nfs4_get_security_label(dentry->d_inode, buf, buflen);
5869 return -EOPNOTSUPP;
5870}
5871
5872static size_t nfs4_xattr_list_nfs4_label(struct dentry *dentry, char *list,
5873 size_t list_len, const char *name,
5874 size_t name_len, int type)
5875{
5876 size_t len = 0;
5877
5878 if (nfs_server_capable(dentry->d_inode, NFS_CAP_SECURITY_LABEL)) {
5879 len = security_inode_listsecurity(dentry->d_inode, NULL, 0);
5880 if (list && len <= list_len)
5881 security_inode_listsecurity(dentry->d_inode, list, len);
5882 }
5883 return len;
5884}
5885
5886static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
5887 .prefix = XATTR_SECURITY_PREFIX,
5888 .list = nfs4_xattr_list_nfs4_label,
5889 .get = nfs4_xattr_get_nfs4_label,
5890 .set = nfs4_xattr_set_nfs4_label,
5891};
5892#endif
5893
5894
5895/*
5896 * nfs_fhget will use either the mounted_on_fileid or the fileid
5897 */
5898static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
5899{
5900 if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
5901 (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
5902 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
5903 (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
5904 return;
5905
5906 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
5907 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
5908 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
5909 fattr->nlink = 2;
5910}
5911
5912static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5913 const struct qstr *name,
5914 struct nfs4_fs_locations *fs_locations,
5915 struct page *page)
5916{
5917 struct nfs_server *server = NFS_SERVER(dir);
5918 u32 bitmask[3] = {
5919 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
5920 };
5921 struct nfs4_fs_locations_arg args = {
5922 .dir_fh = NFS_FH(dir),
5923 .name = name,
5924 .page = page,
5925 .bitmask = bitmask,
5926 };
5927 struct nfs4_fs_locations_res res = {
5928 .fs_locations = fs_locations,
5929 };
5930 struct rpc_message msg = {
5931 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
5932 .rpc_argp = &args,
5933 .rpc_resp = &res,
5934 };
5935 int status;
5936
5937 dprintk("%s: start\n", __func__);
5938
5939 /* Ask for the fileid of the absent filesystem if mounted_on_fileid
5940 * is not supported */
5941 if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
5942 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
5943 else
5944 bitmask[0] |= FATTR4_WORD0_FILEID;
5945
5946 nfs_fattr_init(&fs_locations->fattr);
5947 fs_locations->server = server;
5948 fs_locations->nlocations = 0;
5949 status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
5950 dprintk("%s: returned status = %d\n", __func__, status);
5951 return status;
5952}
5953
5954int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5955 const struct qstr *name,
5956 struct nfs4_fs_locations *fs_locations,
5957 struct page *page)
5958{
5959 struct nfs4_exception exception = { };
5960 int err;
5961 do {
5962 err = _nfs4_proc_fs_locations(client, dir, name,
5963 fs_locations, page);
5964 trace_nfs4_get_fs_locations(dir, name, err);
5965 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5966 &exception);
5967 } while (exception.retry);
5968 return err;
5969}
5970
5971/**
5972 * If 'use_integrity' is true and the state managment nfs_client
5973 * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
5974 * and the machine credential as per RFC3530bis and RFC5661 Security
5975 * Considerations sections. Otherwise, just use the user cred with the
5976 * filesystem's rpc_client.
5977 */
5978static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
5979{
5980 int status;
5981 struct nfs4_secinfo_arg args = {
5982 .dir_fh = NFS_FH(dir),
5983 .name = name,
5984 };
5985 struct nfs4_secinfo_res res = {
5986 .flavors = flavors,
5987 };
5988 struct rpc_message msg = {
5989 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
5990 .rpc_argp = &args,
5991 .rpc_resp = &res,
5992 };
5993 struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
5994
5995 if (use_integrity) {
5996 clnt = NFS_SERVER(dir)->nfs_client->cl_rpcclient;
5997 msg.rpc_cred = nfs4_get_clid_cred(NFS_SERVER(dir)->nfs_client);
5998 }
5999
6000 dprintk("NFS call secinfo %s\n", name->name);
6001
6002 nfs4_state_protect(NFS_SERVER(dir)->nfs_client,
6003 NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
6004
6005 status = nfs4_call_sync(clnt, NFS_SERVER(dir), &msg, &args.seq_args,
6006 &res.seq_res, 0);
6007 dprintk("NFS reply secinfo: %d\n", status);
6008
6009 if (msg.rpc_cred)
6010 put_rpccred(msg.rpc_cred);
6011
6012 return status;
6013}
6014
6015int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
6016 struct nfs4_secinfo_flavors *flavors)
6017{
6018 struct nfs4_exception exception = { };
6019 int err;
6020 do {
6021 err = -NFS4ERR_WRONGSEC;
6022
6023 /* try to use integrity protection with machine cred */
6024 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
6025 err = _nfs4_proc_secinfo(dir, name, flavors, true);
6026
6027 /*
6028 * if unable to use integrity protection, or SECINFO with
6029 * integrity protection returns NFS4ERR_WRONGSEC (which is
6030 * disallowed by spec, but exists in deployed servers) use
6031 * the current filesystem's rpc_client and the user cred.
6032 */
6033 if (err == -NFS4ERR_WRONGSEC)
6034 err = _nfs4_proc_secinfo(dir, name, flavors, false);
6035
6036 trace_nfs4_secinfo(dir, name, err);
6037 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6038 &exception);
6039 } while (exception.retry);
6040 return err;
6041}
6042
6043#ifdef CONFIG_NFS_V4_1
6044/*
6045 * Check the exchange flags returned by the server for invalid flags, having
6046 * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
6047 * DS flags set.
6048 */
6049static int nfs4_check_cl_exchange_flags(u32 flags)
6050{
6051 if (flags & ~EXCHGID4_FLAG_MASK_R)
6052 goto out_inval;
6053 if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
6054 (flags & EXCHGID4_FLAG_USE_NON_PNFS))
6055 goto out_inval;
6056 if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
6057 goto out_inval;
6058 return NFS_OK;
6059out_inval:
6060 return -NFS4ERR_INVAL;
6061}
6062
6063static bool
6064nfs41_same_server_scope(struct nfs41_server_scope *a,
6065 struct nfs41_server_scope *b)
6066{
6067 if (a->server_scope_sz == b->server_scope_sz &&
6068 memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
6069 return true;
6070
6071 return false;
6072}
6073
6074/*
6075 * nfs4_proc_bind_conn_to_session()
6076 *
6077 * The 4.1 client currently uses the same TCP connection for the
6078 * fore and backchannel.
6079 */
6080int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
6081{
6082 int status;
6083 struct nfs41_bind_conn_to_session_res res;
6084 struct rpc_message msg = {
6085 .rpc_proc =
6086 &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
6087 .rpc_argp = clp,
6088 .rpc_resp = &res,
6089 .rpc_cred = cred,
6090 };
6091
6092 dprintk("--> %s\n", __func__);
6093
6094 res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
6095 if (unlikely(res.session == NULL)) {
6096 status = -ENOMEM;
6097 goto out;
6098 }
6099
6100 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6101 trace_nfs4_bind_conn_to_session(clp, status);
6102 if (status == 0) {
6103 if (memcmp(res.session->sess_id.data,
6104 clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
6105 dprintk("NFS: %s: Session ID mismatch\n", __func__);
6106 status = -EIO;
6107 goto out_session;
6108 }
6109 if (res.dir != NFS4_CDFS4_BOTH) {
6110 dprintk("NFS: %s: Unexpected direction from server\n",
6111 __func__);
6112 status = -EIO;
6113 goto out_session;
6114 }
6115 if (res.use_conn_in_rdma_mode) {
6116 dprintk("NFS: %s: Server returned RDMA mode = true\n",
6117 __func__);
6118 status = -EIO;
6119 goto out_session;
6120 }
6121 }
6122out_session:
6123 kfree(res.session);
6124out:
6125 dprintk("<-- %s status= %d\n", __func__, status);
6126 return status;
6127}
6128
6129/*
6130 * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
6131 * and operations we'd like to see to enable certain features in the allow map
6132 */
6133static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
6134 .how = SP4_MACH_CRED,
6135 .enforce.u.words = {
6136 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6137 1 << (OP_EXCHANGE_ID - 32) |
6138 1 << (OP_CREATE_SESSION - 32) |
6139 1 << (OP_DESTROY_SESSION - 32) |
6140 1 << (OP_DESTROY_CLIENTID - 32)
6141 },
6142 .allow.u.words = {
6143 [0] = 1 << (OP_CLOSE) |
6144 1 << (OP_LOCKU),
6145 [1] = 1 << (OP_SECINFO - 32) |
6146 1 << (OP_SECINFO_NO_NAME - 32)
6147 }
6148};
6149
6150/*
6151 * Select the state protection mode for client `clp' given the server results
6152 * from exchange_id in `sp'.
6153 *
6154 * Returns 0 on success, negative errno otherwise.
6155 */
6156static int nfs4_sp4_select_mode(struct nfs_client *clp,
6157 struct nfs41_state_protection *sp)
6158{
6159 static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
6160 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6161 1 << (OP_EXCHANGE_ID - 32) |
6162 1 << (OP_CREATE_SESSION - 32) |
6163 1 << (OP_DESTROY_SESSION - 32) |
6164 1 << (OP_DESTROY_CLIENTID - 32)
6165 };
6166 unsigned int i;
6167
6168 if (sp->how == SP4_MACH_CRED) {
6169 /* Print state protect result */
6170 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
6171 for (i = 0; i <= LAST_NFS4_OP; i++) {
6172 if (test_bit(i, sp->enforce.u.longs))
6173 dfprintk(MOUNT, " enforce op %d\n", i);
6174 if (test_bit(i, sp->allow.u.longs))
6175 dfprintk(MOUNT, " allow op %d\n", i);
6176 }
6177
6178 /* make sure nothing is on enforce list that isn't supported */
6179 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
6180 if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
6181 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6182 return -EINVAL;
6183 }
6184 }
6185
6186 /*
6187 * Minimal mode - state operations are allowed to use machine
6188 * credential. Note this already happens by default, so the
6189 * client doesn't have to do anything more than the negotiation.
6190 *
6191 * NOTE: we don't care if EXCHANGE_ID is in the list -
6192 * we're already using the machine cred for exchange_id
6193 * and will never use a different cred.
6194 */
6195 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
6196 test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
6197 test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
6198 test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
6199 dfprintk(MOUNT, "sp4_mach_cred:\n");
6200 dfprintk(MOUNT, " minimal mode enabled\n");
6201 set_bit(NFS_SP4_MACH_CRED_MINIMAL, &clp->cl_sp4_flags);
6202 } else {
6203 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6204 return -EINVAL;
6205 }
6206
6207 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
6208 test_bit(OP_LOCKU, sp->allow.u.longs)) {
6209 dfprintk(MOUNT, " cleanup mode enabled\n");
6210 set_bit(NFS_SP4_MACH_CRED_CLEANUP, &clp->cl_sp4_flags);
6211 }
6212
6213 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
6214 test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
6215 dfprintk(MOUNT, " secinfo mode enabled\n");
6216 set_bit(NFS_SP4_MACH_CRED_SECINFO, &clp->cl_sp4_flags);
6217 }
6218 }
6219
6220 return 0;
6221}
6222
6223/*
6224 * _nfs4_proc_exchange_id()
6225 *
6226 * Wrapper for EXCHANGE_ID operation.
6227 */
6228static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred,
6229 u32 sp4_how)
6230{
6231 nfs4_verifier verifier;
6232 struct nfs41_exchange_id_args args = {
6233 .verifier = &verifier,
6234 .client = clp,
6235 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6236 EXCHGID4_FLAG_BIND_PRINC_STATEID,
6237 };
6238 struct nfs41_exchange_id_res res = {
6239 0
6240 };
6241 int status;
6242 struct rpc_message msg = {
6243 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
6244 .rpc_argp = &args,
6245 .rpc_resp = &res,
6246 .rpc_cred = cred,
6247 };
6248
6249 nfs4_init_boot_verifier(clp, &verifier);
6250 args.id_len = nfs4_init_uniform_client_string(clp, args.id,
6251 sizeof(args.id));
6252 dprintk("NFS call exchange_id auth=%s, '%.*s'\n",
6253 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6254 args.id_len, args.id);
6255
6256 res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
6257 GFP_NOFS);
6258 if (unlikely(res.server_owner == NULL)) {
6259 status = -ENOMEM;
6260 goto out;
6261 }
6262
6263 res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
6264 GFP_NOFS);
6265 if (unlikely(res.server_scope == NULL)) {
6266 status = -ENOMEM;
6267 goto out_server_owner;
6268 }
6269
6270 res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
6271 if (unlikely(res.impl_id == NULL)) {
6272 status = -ENOMEM;
6273 goto out_server_scope;
6274 }
6275
6276 switch (sp4_how) {
6277 case SP4_NONE:
6278 args.state_protect.how = SP4_NONE;
6279 break;
6280
6281 case SP4_MACH_CRED:
6282 args.state_protect = nfs4_sp4_mach_cred_request;
6283 break;
6284
6285 default:
6286 /* unsupported! */
6287 WARN_ON_ONCE(1);
6288 status = -EINVAL;
6289 goto out_server_scope;
6290 }
6291
6292 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6293 trace_nfs4_exchange_id(clp, status);
6294 if (status == 0)
6295 status = nfs4_check_cl_exchange_flags(res.flags);
6296
6297 if (status == 0)
6298 status = nfs4_sp4_select_mode(clp, &res.state_protect);
6299
6300 if (status == 0) {
6301 clp->cl_clientid = res.clientid;
6302 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
6303 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
6304 clp->cl_seqid = res.seqid;
6305
6306 kfree(clp->cl_serverowner);
6307 clp->cl_serverowner = res.server_owner;
6308 res.server_owner = NULL;
6309
6310 /* use the most recent implementation id */
6311 kfree(clp->cl_implid);
6312 clp->cl_implid = res.impl_id;
6313
6314 if (clp->cl_serverscope != NULL &&
6315 !nfs41_same_server_scope(clp->cl_serverscope,
6316 res.server_scope)) {
6317 dprintk("%s: server_scope mismatch detected\n",
6318 __func__);
6319 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
6320 kfree(clp->cl_serverscope);
6321 clp->cl_serverscope = NULL;
6322 }
6323
6324 if (clp->cl_serverscope == NULL) {
6325 clp->cl_serverscope = res.server_scope;
6326 goto out;
6327 }
6328 } else
6329 kfree(res.impl_id);
6330
6331out_server_owner:
6332 kfree(res.server_owner);
6333out_server_scope:
6334 kfree(res.server_scope);
6335out:
6336 if (clp->cl_implid != NULL)
6337 dprintk("NFS reply exchange_id: Server Implementation ID: "
6338 "domain: %s, name: %s, date: %llu,%u\n",
6339 clp->cl_implid->domain, clp->cl_implid->name,
6340 clp->cl_implid->date.seconds,
6341 clp->cl_implid->date.nseconds);
6342 dprintk("NFS reply exchange_id: %d\n", status);
6343 return status;
6344}
6345
6346/*
6347 * nfs4_proc_exchange_id()
6348 *
6349 * Returns zero, a negative errno, or a negative NFS4ERR status code.
6350 *
6351 * Since the clientid has expired, all compounds using sessions
6352 * associated with the stale clientid will be returning
6353 * NFS4ERR_BADSESSION in the sequence operation, and will therefore
6354 * be in some phase of session reset.
6355 *
6356 * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
6357 */
6358int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
6359{
6360 rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
6361 int status;
6362
6363 /* try SP4_MACH_CRED if krb5i/p */
6364 if (authflavor == RPC_AUTH_GSS_KRB5I ||
6365 authflavor == RPC_AUTH_GSS_KRB5P) {
6366 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
6367 if (!status)
6368 return 0;
6369 }
6370
6371 /* try SP4_NONE */
6372 return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
6373}
6374
6375static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
6376 struct rpc_cred *cred)
6377{
6378 struct rpc_message msg = {
6379 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
6380 .rpc_argp = clp,
6381 .rpc_cred = cred,
6382 };
6383 int status;
6384
6385 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6386 trace_nfs4_destroy_clientid(clp, status);
6387 if (status)
6388 dprintk("NFS: Got error %d from the server %s on "
6389 "DESTROY_CLIENTID.", status, clp->cl_hostname);
6390 return status;
6391}
6392
6393static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
6394 struct rpc_cred *cred)
6395{
6396 unsigned int loop;
6397 int ret;
6398
6399 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
6400 ret = _nfs4_proc_destroy_clientid(clp, cred);
6401 switch (ret) {
6402 case -NFS4ERR_DELAY:
6403 case -NFS4ERR_CLIENTID_BUSY:
6404 ssleep(1);
6405 break;
6406 default:
6407 return ret;
6408 }
6409 }
6410 return 0;
6411}
6412
6413int nfs4_destroy_clientid(struct nfs_client *clp)
6414{
6415 struct rpc_cred *cred;
6416 int ret = 0;
6417
6418 if (clp->cl_mvops->minor_version < 1)
6419 goto out;
6420 if (clp->cl_exchange_flags == 0)
6421 goto out;
6422 if (clp->cl_preserve_clid)
6423 goto out;
6424 cred = nfs4_get_clid_cred(clp);
6425 ret = nfs4_proc_destroy_clientid(clp, cred);
6426 if (cred)
6427 put_rpccred(cred);
6428 switch (ret) {
6429 case 0:
6430 case -NFS4ERR_STALE_CLIENTID:
6431 clp->cl_exchange_flags = 0;
6432 }
6433out:
6434 return ret;
6435}
6436
6437struct nfs4_get_lease_time_data {
6438 struct nfs4_get_lease_time_args *args;
6439 struct nfs4_get_lease_time_res *res;
6440 struct nfs_client *clp;
6441};
6442
6443static void nfs4_get_lease_time_prepare(struct rpc_task *task,
6444 void *calldata)
6445{
6446 struct nfs4_get_lease_time_data *data =
6447 (struct nfs4_get_lease_time_data *)calldata;
6448
6449 dprintk("--> %s\n", __func__);
6450 /* just setup sequence, do not trigger session recovery
6451 since we're invoked within one */
6452 nfs41_setup_sequence(data->clp->cl_session,
6453 &data->args->la_seq_args,
6454 &data->res->lr_seq_res,
6455 task);
6456 dprintk("<-- %s\n", __func__);
6457}
6458
6459/*
6460 * Called from nfs4_state_manager thread for session setup, so don't recover
6461 * from sequence operation or clientid errors.
6462 */
6463static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
6464{
6465 struct nfs4_get_lease_time_data *data =
6466 (struct nfs4_get_lease_time_data *)calldata;
6467
6468 dprintk("--> %s\n", __func__);
6469 if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
6470 return;
6471 switch (task->tk_status) {
6472 case -NFS4ERR_DELAY:
6473 case -NFS4ERR_GRACE:
6474 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
6475 rpc_delay(task, NFS4_POLL_RETRY_MIN);
6476 task->tk_status = 0;
6477 /* fall through */
6478 case -NFS4ERR_RETRY_UNCACHED_REP:
6479 rpc_restart_call_prepare(task);
6480 return;
6481 }
6482 dprintk("<-- %s\n", __func__);
6483}
6484
6485static const struct rpc_call_ops nfs4_get_lease_time_ops = {
6486 .rpc_call_prepare = nfs4_get_lease_time_prepare,
6487 .rpc_call_done = nfs4_get_lease_time_done,
6488};
6489
6490int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
6491{
6492 struct rpc_task *task;
6493 struct nfs4_get_lease_time_args args;
6494 struct nfs4_get_lease_time_res res = {
6495 .lr_fsinfo = fsinfo,
6496 };
6497 struct nfs4_get_lease_time_data data = {
6498 .args = &args,
6499 .res = &res,
6500 .clp = clp,
6501 };
6502 struct rpc_message msg = {
6503 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
6504 .rpc_argp = &args,
6505 .rpc_resp = &res,
6506 };
6507 struct rpc_task_setup task_setup = {
6508 .rpc_client = clp->cl_rpcclient,
6509 .rpc_message = &msg,
6510 .callback_ops = &nfs4_get_lease_time_ops,
6511 .callback_data = &data,
6512 .flags = RPC_TASK_TIMEOUT,
6513 };
6514 int status;
6515
6516 nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
6517 nfs4_set_sequence_privileged(&args.la_seq_args);
6518 dprintk("--> %s\n", __func__);
6519 task = rpc_run_task(&task_setup);
6520
6521 if (IS_ERR(task))
6522 status = PTR_ERR(task);
6523 else {
6524 status = task->tk_status;
6525 rpc_put_task(task);
6526 }
6527 dprintk("<-- %s return %d\n", __func__, status);
6528
6529 return status;
6530}
6531
6532/*
6533 * Initialize the values to be used by the client in CREATE_SESSION
6534 * If nfs4_init_session set the fore channel request and response sizes,
6535 * use them.
6536 *
6537 * Set the back channel max_resp_sz_cached to zero to force the client to
6538 * always set csa_cachethis to FALSE because the current implementation
6539 * of the back channel DRC only supports caching the CB_SEQUENCE operation.
6540 */
6541static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
6542{
6543 unsigned int max_rqst_sz, max_resp_sz;
6544
6545 max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
6546 max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
6547
6548 /* Fore channel attributes */
6549 args->fc_attrs.max_rqst_sz = max_rqst_sz;
6550 args->fc_attrs.max_resp_sz = max_resp_sz;
6551 args->fc_attrs.max_ops = NFS4_MAX_OPS;
6552 args->fc_attrs.max_reqs = max_session_slots;
6553
6554 dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
6555 "max_ops=%u max_reqs=%u\n",
6556 __func__,
6557 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
6558 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
6559
6560 /* Back channel attributes */
6561 args->bc_attrs.max_rqst_sz = PAGE_SIZE;
6562 args->bc_attrs.max_resp_sz = PAGE_SIZE;
6563 args->bc_attrs.max_resp_sz_cached = 0;
6564 args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
6565 args->bc_attrs.max_reqs = 1;
6566
6567 dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
6568 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
6569 __func__,
6570 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
6571 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
6572 args->bc_attrs.max_reqs);
6573}
6574
6575static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
6576{
6577 struct nfs4_channel_attrs *sent = &args->fc_attrs;
6578 struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
6579
6580 if (rcvd->max_resp_sz > sent->max_resp_sz)
6581 return -EINVAL;
6582 /*
6583 * Our requested max_ops is the minimum we need; we're not
6584 * prepared to break up compounds into smaller pieces than that.
6585 * So, no point even trying to continue if the server won't
6586 * cooperate:
6587 */
6588 if (rcvd->max_ops < sent->max_ops)
6589 return -EINVAL;
6590 if (rcvd->max_reqs == 0)
6591 return -EINVAL;
6592 if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
6593 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
6594 return 0;
6595}
6596
6597static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
6598{
6599 struct nfs4_channel_attrs *sent = &args->bc_attrs;
6600 struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
6601
6602 if (rcvd->max_rqst_sz > sent->max_rqst_sz)
6603 return -EINVAL;
6604 if (rcvd->max_resp_sz < sent->max_resp_sz)
6605 return -EINVAL;
6606 if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
6607 return -EINVAL;
6608 /* These would render the backchannel useless: */
6609 if (rcvd->max_ops != sent->max_ops)
6610 return -EINVAL;
6611 if (rcvd->max_reqs != sent->max_reqs)
6612 return -EINVAL;
6613 return 0;
6614}
6615
6616static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
6617 struct nfs4_session *session)
6618{
6619 int ret;
6620
6621 ret = nfs4_verify_fore_channel_attrs(args, session);
6622 if (ret)
6623 return ret;
6624 return nfs4_verify_back_channel_attrs(args, session);
6625}
6626
6627static int _nfs4_proc_create_session(struct nfs_client *clp,
6628 struct rpc_cred *cred)
6629{
6630 struct nfs4_session *session = clp->cl_session;
6631 struct nfs41_create_session_args args = {
6632 .client = clp,
6633 .cb_program = NFS4_CALLBACK,
6634 };
6635 struct nfs41_create_session_res res = {
6636 .client = clp,
6637 };
6638 struct rpc_message msg = {
6639 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
6640 .rpc_argp = &args,
6641 .rpc_resp = &res,
6642 .rpc_cred = cred,
6643 };
6644 int status;
6645
6646 nfs4_init_channel_attrs(&args);
6647 args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
6648
6649 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6650 trace_nfs4_create_session(clp, status);
6651
6652 if (!status) {
6653 /* Verify the session's negotiated channel_attrs values */
6654 status = nfs4_verify_channel_attrs(&args, session);
6655 /* Increment the clientid slot sequence id */
6656 clp->cl_seqid++;
6657 }
6658
6659 return status;
6660}
6661
6662/*
6663 * Issues a CREATE_SESSION operation to the server.
6664 * It is the responsibility of the caller to verify the session is
6665 * expired before calling this routine.
6666 */
6667int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
6668{
6669 int status;
6670 unsigned *ptr;
6671 struct nfs4_session *session = clp->cl_session;
6672
6673 dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
6674
6675 status = _nfs4_proc_create_session(clp, cred);
6676 if (status)
6677 goto out;
6678
6679 /* Init or reset the session slot tables */
6680 status = nfs4_setup_session_slot_tables(session);
6681 dprintk("slot table setup returned %d\n", status);
6682 if (status)
6683 goto out;
6684
6685 ptr = (unsigned *)&session->sess_id.data[0];
6686 dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
6687 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
6688out:
6689 dprintk("<-- %s\n", __func__);
6690 return status;
6691}
6692
6693/*
6694 * Issue the over-the-wire RPC DESTROY_SESSION.
6695 * The caller must serialize access to this routine.
6696 */
6697int nfs4_proc_destroy_session(struct nfs4_session *session,
6698 struct rpc_cred *cred)
6699{
6700 struct rpc_message msg = {
6701 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
6702 .rpc_argp = session,
6703 .rpc_cred = cred,
6704 };
6705 int status = 0;
6706
6707 dprintk("--> nfs4_proc_destroy_session\n");
6708
6709 /* session is still being setup */
6710 if (session->clp->cl_cons_state != NFS_CS_READY)
6711 return status;
6712
6713 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6714 trace_nfs4_destroy_session(session->clp, status);
6715
6716 if (status)
6717 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
6718 "Session has been destroyed regardless...\n", status);
6719
6720 dprintk("<-- nfs4_proc_destroy_session\n");
6721 return status;
6722}
6723
6724/*
6725 * Renew the cl_session lease.
6726 */
6727struct nfs4_sequence_data {
6728 struct nfs_client *clp;
6729 struct nfs4_sequence_args args;
6730 struct nfs4_sequence_res res;
6731};
6732
6733static void nfs41_sequence_release(void *data)
6734{
6735 struct nfs4_sequence_data *calldata = data;
6736 struct nfs_client *clp = calldata->clp;
6737
6738 if (atomic_read(&clp->cl_count) > 1)
6739 nfs4_schedule_state_renewal(clp);
6740 nfs_put_client(clp);
6741 kfree(calldata);
6742}
6743
6744static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
6745{
6746 switch(task->tk_status) {
6747 case -NFS4ERR_DELAY:
6748 rpc_delay(task, NFS4_POLL_RETRY_MAX);
6749 return -EAGAIN;
6750 default:
6751 nfs4_schedule_lease_recovery(clp);
6752 }
6753 return 0;
6754}
6755
6756static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
6757{
6758 struct nfs4_sequence_data *calldata = data;
6759 struct nfs_client *clp = calldata->clp;
6760
6761 if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
6762 return;
6763
6764 trace_nfs4_sequence(clp, task->tk_status);
6765 if (task->tk_status < 0) {
6766 dprintk("%s ERROR %d\n", __func__, task->tk_status);
6767 if (atomic_read(&clp->cl_count) == 1)
6768 goto out;
6769
6770 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
6771 rpc_restart_call_prepare(task);
6772 return;
6773 }
6774 }
6775 dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
6776out:
6777 dprintk("<-- %s\n", __func__);
6778}
6779
6780static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
6781{
6782 struct nfs4_sequence_data *calldata = data;
6783 struct nfs_client *clp = calldata->clp;
6784 struct nfs4_sequence_args *args;
6785 struct nfs4_sequence_res *res;
6786
6787 args = task->tk_msg.rpc_argp;
6788 res = task->tk_msg.rpc_resp;
6789
6790 nfs41_setup_sequence(clp->cl_session, args, res, task);
6791}
6792
6793static const struct rpc_call_ops nfs41_sequence_ops = {
6794 .rpc_call_done = nfs41_sequence_call_done,
6795 .rpc_call_prepare = nfs41_sequence_prepare,
6796 .rpc_release = nfs41_sequence_release,
6797};
6798
6799static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
6800 struct rpc_cred *cred,
6801 bool is_privileged)
6802{
6803 struct nfs4_sequence_data *calldata;
6804 struct rpc_message msg = {
6805 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
6806 .rpc_cred = cred,
6807 };
6808 struct rpc_task_setup task_setup_data = {
6809 .rpc_client = clp->cl_rpcclient,
6810 .rpc_message = &msg,
6811 .callback_ops = &nfs41_sequence_ops,
6812 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
6813 };
6814
6815 if (!atomic_inc_not_zero(&clp->cl_count))
6816 return ERR_PTR(-EIO);
6817 calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
6818 if (calldata == NULL) {
6819 nfs_put_client(clp);
6820 return ERR_PTR(-ENOMEM);
6821 }
6822 nfs4_init_sequence(&calldata->args, &calldata->res, 0);
6823 if (is_privileged)
6824 nfs4_set_sequence_privileged(&calldata->args);
6825 msg.rpc_argp = &calldata->args;
6826 msg.rpc_resp = &calldata->res;
6827 calldata->clp = clp;
6828 task_setup_data.callback_data = calldata;
6829
6830 return rpc_run_task(&task_setup_data);
6831}
6832
6833static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
6834{
6835 struct rpc_task *task;
6836 int ret = 0;
6837
6838 if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
6839 return 0;
6840 task = _nfs41_proc_sequence(clp, cred, false);
6841 if (IS_ERR(task))
6842 ret = PTR_ERR(task);
6843 else
6844 rpc_put_task_async(task);
6845 dprintk("<-- %s status=%d\n", __func__, ret);
6846 return ret;
6847}
6848
6849static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
6850{
6851 struct rpc_task *task;
6852 int ret;
6853
6854 task = _nfs41_proc_sequence(clp, cred, true);
6855 if (IS_ERR(task)) {
6856 ret = PTR_ERR(task);
6857 goto out;
6858 }
6859 ret = rpc_wait_for_completion_task(task);
6860 if (!ret) {
6861 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
6862
6863 if (task->tk_status == 0)
6864 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
6865 ret = task->tk_status;
6866 }
6867 rpc_put_task(task);
6868out:
6869 dprintk("<-- %s status=%d\n", __func__, ret);
6870 return ret;
6871}
6872
6873struct nfs4_reclaim_complete_data {
6874 struct nfs_client *clp;
6875 struct nfs41_reclaim_complete_args arg;
6876 struct nfs41_reclaim_complete_res res;
6877};
6878
6879static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
6880{
6881 struct nfs4_reclaim_complete_data *calldata = data;
6882
6883 nfs41_setup_sequence(calldata->clp->cl_session,
6884 &calldata->arg.seq_args,
6885 &calldata->res.seq_res,
6886 task);
6887}
6888
6889static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
6890{
6891 switch(task->tk_status) {
6892 case 0:
6893 case -NFS4ERR_COMPLETE_ALREADY:
6894 case -NFS4ERR_WRONG_CRED: /* What to do here? */
6895 break;
6896 case -NFS4ERR_DELAY:
6897 rpc_delay(task, NFS4_POLL_RETRY_MAX);
6898 /* fall through */
6899 case -NFS4ERR_RETRY_UNCACHED_REP:
6900 return -EAGAIN;
6901 default:
6902 nfs4_schedule_lease_recovery(clp);
6903 }
6904 return 0;
6905}
6906
6907static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
6908{
6909 struct nfs4_reclaim_complete_data *calldata = data;
6910 struct nfs_client *clp = calldata->clp;
6911 struct nfs4_sequence_res *res = &calldata->res.seq_res;
6912
6913 dprintk("--> %s\n", __func__);
6914 if (!nfs41_sequence_done(task, res))
6915 return;
6916
6917 trace_nfs4_reclaim_complete(clp, task->tk_status);
6918 if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
6919 rpc_restart_call_prepare(task);
6920 return;
6921 }
6922 dprintk("<-- %s\n", __func__);
6923}
6924
6925static void nfs4_free_reclaim_complete_data(void *data)
6926{
6927 struct nfs4_reclaim_complete_data *calldata = data;
6928
6929 kfree(calldata);
6930}
6931
6932static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
6933 .rpc_call_prepare = nfs4_reclaim_complete_prepare,
6934 .rpc_call_done = nfs4_reclaim_complete_done,
6935 .rpc_release = nfs4_free_reclaim_complete_data,
6936};
6937
6938/*
6939 * Issue a global reclaim complete.
6940 */
6941static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
6942 struct rpc_cred *cred)
6943{
6944 struct nfs4_reclaim_complete_data *calldata;
6945 struct rpc_task *task;
6946 struct rpc_message msg = {
6947 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
6948 .rpc_cred = cred,
6949 };
6950 struct rpc_task_setup task_setup_data = {
6951 .rpc_client = clp->cl_rpcclient,
6952 .rpc_message = &msg,
6953 .callback_ops = &nfs4_reclaim_complete_call_ops,
6954 .flags = RPC_TASK_ASYNC,
6955 };
6956 int status = -ENOMEM;
6957
6958 dprintk("--> %s\n", __func__);
6959 calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
6960 if (calldata == NULL)
6961 goto out;
6962 calldata->clp = clp;
6963 calldata->arg.one_fs = 0;
6964
6965 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
6966 nfs4_set_sequence_privileged(&calldata->arg.seq_args);
6967 msg.rpc_argp = &calldata->arg;
6968 msg.rpc_resp = &calldata->res;
6969 task_setup_data.callback_data = calldata;
6970 task = rpc_run_task(&task_setup_data);
6971 if (IS_ERR(task)) {
6972 status = PTR_ERR(task);
6973 goto out;
6974 }
6975 status = nfs4_wait_for_completion_rpc_task(task);
6976 if (status == 0)
6977 status = task->tk_status;
6978 rpc_put_task(task);
6979 return 0;
6980out:
6981 dprintk("<-- %s status=%d\n", __func__, status);
6982 return status;
6983}
6984
6985static void
6986nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
6987{
6988 struct nfs4_layoutget *lgp = calldata;
6989 struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6990 struct nfs4_session *session = nfs4_get_session(server);
6991
6992 dprintk("--> %s\n", __func__);
6993 /* Note the is a race here, where a CB_LAYOUTRECALL can come in
6994 * right now covering the LAYOUTGET we are about to send.
6995 * However, that is not so catastrophic, and there seems
6996 * to be no way to prevent it completely.
6997 */
6998 if (nfs41_setup_sequence(session, &lgp->args.seq_args,
6999 &lgp->res.seq_res, task))
7000 return;
7001 if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
7002 NFS_I(lgp->args.inode)->layout,
7003 lgp->args.ctx->state)) {
7004 rpc_exit(task, NFS4_OK);
7005 }
7006}
7007
7008static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
7009{
7010 struct nfs4_layoutget *lgp = calldata;
7011 struct inode *inode = lgp->args.inode;
7012 struct nfs_server *server = NFS_SERVER(inode);
7013 struct pnfs_layout_hdr *lo;
7014 struct nfs4_state *state = NULL;
7015 unsigned long timeo, giveup;
7016
7017 dprintk("--> %s\n", __func__);
7018
7019 if (!nfs41_sequence_done(task, &lgp->res.seq_res))
7020 goto out;
7021
7022 switch (task->tk_status) {
7023 case 0:
7024 goto out;
7025 case -NFS4ERR_LAYOUTTRYLATER:
7026 case -NFS4ERR_RECALLCONFLICT:
7027 timeo = rpc_get_timeout(task->tk_client);
7028 giveup = lgp->args.timestamp + timeo;
7029 if (time_after(giveup, jiffies))
7030 task->tk_status = -NFS4ERR_DELAY;
7031 break;
7032 case -NFS4ERR_EXPIRED:
7033 case -NFS4ERR_BAD_STATEID:
7034 spin_lock(&inode->i_lock);
7035 lo = NFS_I(inode)->layout;
7036 if (!lo || list_empty(&lo->plh_segs)) {
7037 spin_unlock(&inode->i_lock);
7038 /* If the open stateid was bad, then recover it. */
7039 state = lgp->args.ctx->state;
7040 } else {
7041 LIST_HEAD(head);
7042
7043 pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
7044 spin_unlock(&inode->i_lock);
7045 /* Mark the bad layout state as invalid, then
7046 * retry using the open stateid. */
7047 pnfs_free_lseg_list(&head);
7048 }
7049 }
7050 if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
7051 rpc_restart_call_prepare(task);
7052out:
7053 dprintk("<-- %s\n", __func__);
7054}
7055
7056static size_t max_response_pages(struct nfs_server *server)
7057{
7058 u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
7059 return nfs_page_array_len(0, max_resp_sz);
7060}
7061
7062static void nfs4_free_pages(struct page **pages, size_t size)
7063{
7064 int i;
7065
7066 if (!pages)
7067 return;
7068
7069 for (i = 0; i < size; i++) {
7070 if (!pages[i])
7071 break;
7072 __free_page(pages[i]);
7073 }
7074 kfree(pages);
7075}
7076
7077static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
7078{
7079 struct page **pages;
7080 int i;
7081
7082 pages = kcalloc(size, sizeof(struct page *), gfp_flags);
7083 if (!pages) {
7084 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
7085 return NULL;
7086 }
7087
7088 for (i = 0; i < size; i++) {
7089 pages[i] = alloc_page(gfp_flags);
7090 if (!pages[i]) {
7091 dprintk("%s: failed to allocate page\n", __func__);
7092 nfs4_free_pages(pages, size);
7093 return NULL;
7094 }
7095 }
7096
7097 return pages;
7098}
7099
7100static void nfs4_layoutget_release(void *calldata)
7101{
7102 struct nfs4_layoutget *lgp = calldata;
7103 struct inode *inode = lgp->args.inode;
7104 struct nfs_server *server = NFS_SERVER(inode);
7105 size_t max_pages = max_response_pages(server);
7106
7107 dprintk("--> %s\n", __func__);
7108 nfs4_free_pages(lgp->args.layout.pages, max_pages);
7109 pnfs_put_layout_hdr(NFS_I(inode)->layout);
7110 put_nfs_open_context(lgp->args.ctx);
7111 kfree(calldata);
7112 dprintk("<-- %s\n", __func__);
7113}
7114
7115static const struct rpc_call_ops nfs4_layoutget_call_ops = {
7116 .rpc_call_prepare = nfs4_layoutget_prepare,
7117 .rpc_call_done = nfs4_layoutget_done,
7118 .rpc_release = nfs4_layoutget_release,
7119};
7120
7121struct pnfs_layout_segment *
7122nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
7123{
7124 struct inode *inode = lgp->args.inode;
7125 struct nfs_server *server = NFS_SERVER(inode);
7126 size_t max_pages = max_response_pages(server);
7127 struct rpc_task *task;
7128 struct rpc_message msg = {
7129 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
7130 .rpc_argp = &lgp->args,
7131 .rpc_resp = &lgp->res,
7132 .rpc_cred = lgp->cred,
7133 };
7134 struct rpc_task_setup task_setup_data = {
7135 .rpc_client = server->client,
7136 .rpc_message = &msg,
7137 .callback_ops = &nfs4_layoutget_call_ops,
7138 .callback_data = lgp,
7139 .flags = RPC_TASK_ASYNC,
7140 };
7141 struct pnfs_layout_segment *lseg = NULL;
7142 int status = 0;
7143
7144 dprintk("--> %s\n", __func__);
7145
7146 lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
7147 if (!lgp->args.layout.pages) {
7148 nfs4_layoutget_release(lgp);
7149 return ERR_PTR(-ENOMEM);
7150 }
7151 lgp->args.layout.pglen = max_pages * PAGE_SIZE;
7152 lgp->args.timestamp = jiffies;
7153
7154 lgp->res.layoutp = &lgp->args.layout;
7155 lgp->res.seq_res.sr_slot = NULL;
7156 nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
7157
7158 /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
7159 pnfs_get_layout_hdr(NFS_I(inode)->layout);
7160
7161 task = rpc_run_task(&task_setup_data);
7162 if (IS_ERR(task))
7163 return ERR_CAST(task);
7164 status = nfs4_wait_for_completion_rpc_task(task);
7165 if (status == 0)
7166 status = task->tk_status;
7167 trace_nfs4_layoutget(lgp->args.ctx,
7168 &lgp->args.range,
7169 &lgp->res.range,
7170 status);
7171 /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
7172 if (status == 0 && lgp->res.layoutp->len)
7173 lseg = pnfs_layout_process(lgp);
7174 rpc_put_task(task);
7175 dprintk("<-- %s status=%d\n", __func__, status);
7176 if (status)
7177 return ERR_PTR(status);
7178 return lseg;
7179}
7180
7181static void
7182nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
7183{
7184 struct nfs4_layoutreturn *lrp = calldata;
7185
7186 dprintk("--> %s\n", __func__);
7187 nfs41_setup_sequence(lrp->clp->cl_session,
7188 &lrp->args.seq_args,
7189 &lrp->res.seq_res,
7190 task);
7191}
7192
7193static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
7194{
7195 struct nfs4_layoutreturn *lrp = calldata;
7196 struct nfs_server *server;
7197
7198 dprintk("--> %s\n", __func__);
7199
7200 if (!nfs41_sequence_done(task, &lrp->res.seq_res))
7201 return;
7202
7203 server = NFS_SERVER(lrp->args.inode);
7204 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
7205 rpc_restart_call_prepare(task);
7206 return;
7207 }
7208 dprintk("<-- %s\n", __func__);
7209}
7210
7211static void nfs4_layoutreturn_release(void *calldata)
7212{
7213 struct nfs4_layoutreturn *lrp = calldata;
7214 struct pnfs_layout_hdr *lo = lrp->args.layout;
7215
7216 dprintk("--> %s\n", __func__);
7217 spin_lock(&lo->plh_inode->i_lock);
7218 if (lrp->res.lrs_present)
7219 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
7220 lo->plh_block_lgets--;
7221 spin_unlock(&lo->plh_inode->i_lock);
7222 pnfs_put_layout_hdr(lrp->args.layout);
7223 kfree(calldata);
7224 dprintk("<-- %s\n", __func__);
7225}
7226
7227static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
7228 .rpc_call_prepare = nfs4_layoutreturn_prepare,
7229 .rpc_call_done = nfs4_layoutreturn_done,
7230 .rpc_release = nfs4_layoutreturn_release,
7231};
7232
7233int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
7234{
7235 struct rpc_task *task;
7236 struct rpc_message msg = {
7237 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
7238 .rpc_argp = &lrp->args,
7239 .rpc_resp = &lrp->res,
7240 .rpc_cred = lrp->cred,
7241 };
7242 struct rpc_task_setup task_setup_data = {
7243 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
7244 .rpc_message = &msg,
7245 .callback_ops = &nfs4_layoutreturn_call_ops,
7246 .callback_data = lrp,
7247 };
7248 int status;
7249
7250 dprintk("--> %s\n", __func__);
7251 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
7252 task = rpc_run_task(&task_setup_data);
7253 if (IS_ERR(task))
7254 return PTR_ERR(task);
7255 status = task->tk_status;
7256 trace_nfs4_layoutreturn(lrp->args.inode, status);
7257 dprintk("<-- %s status=%d\n", __func__, status);
7258 rpc_put_task(task);
7259 return status;
7260}
7261
7262/*
7263 * Retrieve the list of Data Server devices from the MDS.
7264 */
7265static int _nfs4_getdevicelist(struct nfs_server *server,
7266 const struct nfs_fh *fh,
7267 struct pnfs_devicelist *devlist)
7268{
7269 struct nfs4_getdevicelist_args args = {
7270 .fh = fh,
7271 .layoutclass = server->pnfs_curr_ld->id,
7272 };
7273 struct nfs4_getdevicelist_res res = {
7274 .devlist = devlist,
7275 };
7276 struct rpc_message msg = {
7277 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
7278 .rpc_argp = &args,
7279 .rpc_resp = &res,
7280 };
7281 int status;
7282
7283 dprintk("--> %s\n", __func__);
7284 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
7285 &res.seq_res, 0);
7286 dprintk("<-- %s status=%d\n", __func__, status);
7287 return status;
7288}
7289
7290int nfs4_proc_getdevicelist(struct nfs_server *server,
7291 const struct nfs_fh *fh,
7292 struct pnfs_devicelist *devlist)
7293{
7294 struct nfs4_exception exception = { };
7295 int err;
7296
7297 do {
7298 err = nfs4_handle_exception(server,
7299 _nfs4_getdevicelist(server, fh, devlist),
7300 &exception);
7301 } while (exception.retry);
7302
7303 dprintk("%s: err=%d, num_devs=%u\n", __func__,
7304 err, devlist->num_devs);
7305
7306 return err;
7307}
7308EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
7309
7310static int
7311_nfs4_proc_getdeviceinfo(struct nfs_server *server,
7312 struct pnfs_device *pdev,
7313 struct rpc_cred *cred)
7314{
7315 struct nfs4_getdeviceinfo_args args = {
7316 .pdev = pdev,
7317 };
7318 struct nfs4_getdeviceinfo_res res = {
7319 .pdev = pdev,
7320 };
7321 struct rpc_message msg = {
7322 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
7323 .rpc_argp = &args,
7324 .rpc_resp = &res,
7325 .rpc_cred = cred,
7326 };
7327 int status;
7328
7329 dprintk("--> %s\n", __func__);
7330 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
7331 dprintk("<-- %s status=%d\n", __func__, status);
7332
7333 return status;
7334}
7335
7336int nfs4_proc_getdeviceinfo(struct nfs_server *server,
7337 struct pnfs_device *pdev,
7338 struct rpc_cred *cred)
7339{
7340 struct nfs4_exception exception = { };
7341 int err;
7342
7343 do {
7344 err = nfs4_handle_exception(server,
7345 _nfs4_proc_getdeviceinfo(server, pdev, cred),
7346 &exception);
7347 } while (exception.retry);
7348 return err;
7349}
7350EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
7351
7352static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
7353{
7354 struct nfs4_layoutcommit_data *data = calldata;
7355 struct nfs_server *server = NFS_SERVER(data->args.inode);
7356 struct nfs4_session *session = nfs4_get_session(server);
7357
7358 nfs41_setup_sequence(session,
7359 &data->args.seq_args,
7360 &data->res.seq_res,
7361 task);
7362}
7363
7364static void
7365nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
7366{
7367 struct nfs4_layoutcommit_data *data = calldata;
7368 struct nfs_server *server = NFS_SERVER(data->args.inode);
7369
7370 if (!nfs41_sequence_done(task, &data->res.seq_res))
7371 return;
7372
7373 switch (task->tk_status) { /* Just ignore these failures */
7374 case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
7375 case -NFS4ERR_BADIOMODE: /* no IOMODE_RW layout for range */
7376 case -NFS4ERR_BADLAYOUT: /* no layout */
7377 case -NFS4ERR_GRACE: /* loca_recalim always false */
7378 task->tk_status = 0;
7379 break;
7380 case 0:
7381 nfs_post_op_update_inode_force_wcc(data->args.inode,
7382 data->res.fattr);
7383 break;
7384 default:
7385 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
7386 rpc_restart_call_prepare(task);
7387 return;
7388 }
7389 }
7390}
7391
7392static void nfs4_layoutcommit_release(void *calldata)
7393{
7394 struct nfs4_layoutcommit_data *data = calldata;
7395
7396 pnfs_cleanup_layoutcommit(data);
7397 put_rpccred(data->cred);
7398 kfree(data);
7399}
7400
7401static const struct rpc_call_ops nfs4_layoutcommit_ops = {
7402 .rpc_call_prepare = nfs4_layoutcommit_prepare,
7403 .rpc_call_done = nfs4_layoutcommit_done,
7404 .rpc_release = nfs4_layoutcommit_release,
7405};
7406
7407int
7408nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
7409{
7410 struct rpc_message msg = {
7411 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
7412 .rpc_argp = &data->args,
7413 .rpc_resp = &data->res,
7414 .rpc_cred = data->cred,
7415 };
7416 struct rpc_task_setup task_setup_data = {
7417 .task = &data->task,
7418 .rpc_client = NFS_CLIENT(data->args.inode),
7419 .rpc_message = &msg,
7420 .callback_ops = &nfs4_layoutcommit_ops,
7421 .callback_data = data,
7422 .flags = RPC_TASK_ASYNC,
7423 };
7424 struct rpc_task *task;
7425 int status = 0;
7426
7427 dprintk("NFS: %4d initiating layoutcommit call. sync %d "
7428 "lbw: %llu inode %lu\n",
7429 data->task.tk_pid, sync,
7430 data->args.lastbytewritten,
7431 data->args.inode->i_ino);
7432
7433 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
7434 task = rpc_run_task(&task_setup_data);
7435 if (IS_ERR(task))
7436 return PTR_ERR(task);
7437 if (sync == false)
7438 goto out;
7439 status = nfs4_wait_for_completion_rpc_task(task);
7440 if (status != 0)
7441 goto out;
7442 status = task->tk_status;
7443 trace_nfs4_layoutcommit(data->args.inode, status);
7444out:
7445 dprintk("%s: status %d\n", __func__, status);
7446 rpc_put_task(task);
7447 return status;
7448}
7449
7450/**
7451 * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
7452 * possible) as per RFC3530bis and RFC5661 Security Considerations sections
7453 */
7454static int
7455_nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
7456 struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
7457{
7458 struct nfs41_secinfo_no_name_args args = {
7459 .style = SECINFO_STYLE_CURRENT_FH,
7460 };
7461 struct nfs4_secinfo_res res = {
7462 .flavors = flavors,
7463 };
7464 struct rpc_message msg = {
7465 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
7466 .rpc_argp = &args,
7467 .rpc_resp = &res,
7468 };
7469 return nfs4_call_sync(server->nfs_client->cl_rpcclient, server, &msg,
7470 &args.seq_args, &res.seq_res, 0);
7471}
7472
7473static int
7474nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
7475 struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
7476{
7477 struct nfs4_exception exception = { };
7478 int err;
7479 do {
7480 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
7481 switch (err) {
7482 case 0:
7483 case -NFS4ERR_WRONGSEC:
7484 case -NFS4ERR_NOTSUPP:
7485 goto out;
7486 default:
7487 err = nfs4_handle_exception(server, err, &exception);
7488 }
7489 } while (exception.retry);
7490out:
7491 return err;
7492}
7493
7494static int
7495nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
7496 struct nfs_fsinfo *info)
7497{
7498 int err;
7499 struct page *page;
7500 rpc_authflavor_t flavor;
7501 struct nfs4_secinfo_flavors *flavors;
7502
7503 page = alloc_page(GFP_KERNEL);
7504 if (!page) {
7505 err = -ENOMEM;
7506 goto out;
7507 }
7508
7509 flavors = page_address(page);
7510 err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
7511
7512 /*
7513 * Fall back on "guess and check" method if
7514 * the server doesn't support SECINFO_NO_NAME
7515 */
7516 if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
7517 err = nfs4_find_root_sec(server, fhandle, info);
7518 goto out_freepage;
7519 }
7520 if (err)
7521 goto out_freepage;
7522
7523 flavor = nfs_find_best_sec(flavors);
7524 if (err == 0)
7525 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
7526
7527out_freepage:
7528 put_page(page);
7529 if (err == -EACCES)
7530 return -EPERM;
7531out:
7532 return err;
7533}
7534
7535static int _nfs41_test_stateid(struct nfs_server *server,
7536 nfs4_stateid *stateid,
7537 struct rpc_cred *cred)
7538{
7539 int status;
7540 struct nfs41_test_stateid_args args = {
7541 .stateid = stateid,
7542 };
7543 struct nfs41_test_stateid_res res;
7544 struct rpc_message msg = {
7545 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
7546 .rpc_argp = &args,
7547 .rpc_resp = &res,
7548 .rpc_cred = cred,
7549 };
7550
7551 dprintk("NFS call test_stateid %p\n", stateid);
7552 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
7553 nfs4_set_sequence_privileged(&args.seq_args);
7554 status = nfs4_call_sync_sequence(server->client, server, &msg,
7555 &args.seq_args, &res.seq_res);
7556 if (status != NFS_OK) {
7557 dprintk("NFS reply test_stateid: failed, %d\n", status);
7558 return status;
7559 }
7560 dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
7561 return -res.status;
7562}
7563
7564/**
7565 * nfs41_test_stateid - perform a TEST_STATEID operation
7566 *
7567 * @server: server / transport on which to perform the operation
7568 * @stateid: state ID to test
7569 * @cred: credential
7570 *
7571 * Returns NFS_OK if the server recognizes that "stateid" is valid.
7572 * Otherwise a negative NFS4ERR value is returned if the operation
7573 * failed or the state ID is not currently valid.
7574 */
7575static int nfs41_test_stateid(struct nfs_server *server,
7576 nfs4_stateid *stateid,
7577 struct rpc_cred *cred)
7578{
7579 struct nfs4_exception exception = { };
7580 int err;
7581 do {
7582 err = _nfs41_test_stateid(server, stateid, cred);
7583 if (err != -NFS4ERR_DELAY)
7584 break;
7585 nfs4_handle_exception(server, err, &exception);
7586 } while (exception.retry);
7587 return err;
7588}
7589
7590struct nfs_free_stateid_data {
7591 struct nfs_server *server;
7592 struct nfs41_free_stateid_args args;
7593 struct nfs41_free_stateid_res res;
7594};
7595
7596static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
7597{
7598 struct nfs_free_stateid_data *data = calldata;
7599 nfs41_setup_sequence(nfs4_get_session(data->server),
7600 &data->args.seq_args,
7601 &data->res.seq_res,
7602 task);
7603}
7604
7605static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
7606{
7607 struct nfs_free_stateid_data *data = calldata;
7608
7609 nfs41_sequence_done(task, &data->res.seq_res);
7610
7611 switch (task->tk_status) {
7612 case -NFS4ERR_DELAY:
7613 if (nfs4_async_handle_error(task, data->server, NULL) == -EAGAIN)
7614 rpc_restart_call_prepare(task);
7615 }
7616}
7617
7618static void nfs41_free_stateid_release(void *calldata)
7619{
7620 kfree(calldata);
7621}
7622
7623static const struct rpc_call_ops nfs41_free_stateid_ops = {
7624 .rpc_call_prepare = nfs41_free_stateid_prepare,
7625 .rpc_call_done = nfs41_free_stateid_done,
7626 .rpc_release = nfs41_free_stateid_release,
7627};
7628
7629static struct rpc_task *_nfs41_free_stateid(struct nfs_server *server,
7630 nfs4_stateid *stateid,
7631 struct rpc_cred *cred,
7632 bool privileged)
7633{
7634 struct rpc_message msg = {
7635 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
7636 .rpc_cred = cred,
7637 };
7638 struct rpc_task_setup task_setup = {
7639 .rpc_client = server->client,
7640 .rpc_message = &msg,
7641 .callback_ops = &nfs41_free_stateid_ops,
7642 .flags = RPC_TASK_ASYNC,
7643 };
7644 struct nfs_free_stateid_data *data;
7645
7646 dprintk("NFS call free_stateid %p\n", stateid);
7647 data = kmalloc(sizeof(*data), GFP_NOFS);
7648 if (!data)
7649 return ERR_PTR(-ENOMEM);
7650 data->server = server;
7651 nfs4_stateid_copy(&data->args.stateid, stateid);
7652
7653 task_setup.callback_data = data;
7654
7655 msg.rpc_argp = &data->args;
7656 msg.rpc_resp = &data->res;
7657 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
7658 if (privileged)
7659 nfs4_set_sequence_privileged(&data->args.seq_args);
7660
7661 return rpc_run_task(&task_setup);
7662}
7663
7664/**
7665 * nfs41_free_stateid - perform a FREE_STATEID operation
7666 *
7667 * @server: server / transport on which to perform the operation
7668 * @stateid: state ID to release
7669 * @cred: credential
7670 *
7671 * Returns NFS_OK if the server freed "stateid". Otherwise a
7672 * negative NFS4ERR value is returned.
7673 */
7674static int nfs41_free_stateid(struct nfs_server *server,
7675 nfs4_stateid *stateid,
7676 struct rpc_cred *cred)
7677{
7678 struct rpc_task *task;
7679 int ret;
7680
7681 task = _nfs41_free_stateid(server, stateid, cred, true);
7682 if (IS_ERR(task))
7683 return PTR_ERR(task);
7684 ret = rpc_wait_for_completion_task(task);
7685 if (!ret)
7686 ret = task->tk_status;
7687 rpc_put_task(task);
7688 return ret;
7689}
7690
7691static int nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
7692{
7693 struct rpc_task *task;
7694 struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
7695
7696 task = _nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
7697 nfs4_free_lock_state(server, lsp);
7698 if (IS_ERR(task))
7699 return PTR_ERR(task);
7700 rpc_put_task(task);
7701 return 0;
7702}
7703
7704static bool nfs41_match_stateid(const nfs4_stateid *s1,
7705 const nfs4_stateid *s2)
7706{
7707 if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
7708 return false;
7709
7710 if (s1->seqid == s2->seqid)
7711 return true;
7712 if (s1->seqid == 0 || s2->seqid == 0)
7713 return true;
7714
7715 return false;
7716}
7717
7718#endif /* CONFIG_NFS_V4_1 */
7719
7720static bool nfs4_match_stateid(const nfs4_stateid *s1,
7721 const nfs4_stateid *s2)
7722{
7723 return nfs4_stateid_match(s1, s2);
7724}
7725
7726
7727static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
7728 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
7729 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
7730 .recover_open = nfs4_open_reclaim,
7731 .recover_lock = nfs4_lock_reclaim,
7732 .establish_clid = nfs4_init_clientid,
7733 .detect_trunking = nfs40_discover_server_trunking,
7734};
7735
7736#if defined(CONFIG_NFS_V4_1)
7737static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
7738 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
7739 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
7740 .recover_open = nfs4_open_reclaim,
7741 .recover_lock = nfs4_lock_reclaim,
7742 .establish_clid = nfs41_init_clientid,
7743 .reclaim_complete = nfs41_proc_reclaim_complete,
7744 .detect_trunking = nfs41_discover_server_trunking,
7745};
7746#endif /* CONFIG_NFS_V4_1 */
7747
7748static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
7749 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
7750 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
7751 .recover_open = nfs4_open_expired,
7752 .recover_lock = nfs4_lock_expired,
7753 .establish_clid = nfs4_init_clientid,
7754};
7755
7756#if defined(CONFIG_NFS_V4_1)
7757static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
7758 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
7759 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
7760 .recover_open = nfs41_open_expired,
7761 .recover_lock = nfs41_lock_expired,
7762 .establish_clid = nfs41_init_clientid,
7763};
7764#endif /* CONFIG_NFS_V4_1 */
7765
7766static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
7767 .sched_state_renewal = nfs4_proc_async_renew,
7768 .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
7769 .renew_lease = nfs4_proc_renew,
7770};
7771
7772#if defined(CONFIG_NFS_V4_1)
7773static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
7774 .sched_state_renewal = nfs41_proc_async_sequence,
7775 .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
7776 .renew_lease = nfs4_proc_sequence,
7777};
7778#endif
7779
7780static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
7781 .minor_version = 0,
7782 .init_caps = NFS_CAP_READDIRPLUS
7783 | NFS_CAP_ATOMIC_OPEN
7784 | NFS_CAP_CHANGE_ATTR
7785 | NFS_CAP_POSIX_LOCK,
7786 .init_client = nfs40_init_client,
7787 .shutdown_client = nfs40_shutdown_client,
7788 .match_stateid = nfs4_match_stateid,
7789 .find_root_sec = nfs4_find_root_sec,
7790 .free_lock_state = nfs4_release_lockowner,
7791 .call_sync_ops = &nfs40_call_sync_ops,
7792 .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
7793 .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
7794 .state_renewal_ops = &nfs40_state_renewal_ops,
7795};
7796
7797#if defined(CONFIG_NFS_V4_1)
7798static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
7799 .minor_version = 1,
7800 .init_caps = NFS_CAP_READDIRPLUS
7801 | NFS_CAP_ATOMIC_OPEN
7802 | NFS_CAP_CHANGE_ATTR
7803 | NFS_CAP_POSIX_LOCK
7804 | NFS_CAP_STATEID_NFSV41
7805 | NFS_CAP_ATOMIC_OPEN_V1,
7806 .init_client = nfs41_init_client,
7807 .shutdown_client = nfs41_shutdown_client,
7808 .match_stateid = nfs41_match_stateid,
7809 .find_root_sec = nfs41_find_root_sec,
7810 .free_lock_state = nfs41_free_lock_state,
7811 .call_sync_ops = &nfs41_call_sync_ops,
7812 .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
7813 .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
7814 .state_renewal_ops = &nfs41_state_renewal_ops,
7815};
7816#endif
7817
7818#if defined(CONFIG_NFS_V4_2)
7819static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
7820 .minor_version = 2,
7821 .init_caps = NFS_CAP_READDIRPLUS
7822 | NFS_CAP_ATOMIC_OPEN
7823 | NFS_CAP_CHANGE_ATTR
7824 | NFS_CAP_POSIX_LOCK
7825 | NFS_CAP_STATEID_NFSV41
7826 | NFS_CAP_ATOMIC_OPEN_V1,
7827 .init_client = nfs41_init_client,
7828 .shutdown_client = nfs41_shutdown_client,
7829 .match_stateid = nfs41_match_stateid,
7830 .find_root_sec = nfs41_find_root_sec,
7831 .free_lock_state = nfs41_free_lock_state,
7832 .call_sync_ops = &nfs41_call_sync_ops,
7833 .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
7834 .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
7835 .state_renewal_ops = &nfs41_state_renewal_ops,
7836};
7837#endif
7838
7839const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
7840 [0] = &nfs_v4_0_minor_ops,
7841#if defined(CONFIG_NFS_V4_1)
7842 [1] = &nfs_v4_1_minor_ops,
7843#endif
7844#if defined(CONFIG_NFS_V4_2)
7845 [2] = &nfs_v4_2_minor_ops,
7846#endif
7847};
7848
7849static const struct inode_operations nfs4_dir_inode_operations = {
7850 .create = nfs_create,
7851 .lookup = nfs_lookup,
7852 .atomic_open = nfs_atomic_open,
7853 .link = nfs_link,
7854 .unlink = nfs_unlink,
7855 .symlink = nfs_symlink,
7856 .mkdir = nfs_mkdir,
7857 .rmdir = nfs_rmdir,
7858 .mknod = nfs_mknod,
7859 .rename = nfs_rename,
7860 .permission = nfs_permission,
7861 .getattr = nfs_getattr,
7862 .setattr = nfs_setattr,
7863 .getxattr = generic_getxattr,
7864 .setxattr = generic_setxattr,
7865 .listxattr = generic_listxattr,
7866 .removexattr = generic_removexattr,
7867};
7868
7869static const struct inode_operations nfs4_file_inode_operations = {
7870 .permission = nfs_permission,
7871 .getattr = nfs_getattr,
7872 .setattr = nfs_setattr,
7873 .getxattr = generic_getxattr,
7874 .setxattr = generic_setxattr,
7875 .listxattr = generic_listxattr,
7876 .removexattr = generic_removexattr,
7877};
7878
7879const struct nfs_rpc_ops nfs_v4_clientops = {
7880 .version = 4, /* protocol version */
7881 .dentry_ops = &nfs4_dentry_operations,
7882 .dir_inode_ops = &nfs4_dir_inode_operations,
7883 .file_inode_ops = &nfs4_file_inode_operations,
7884 .file_ops = &nfs4_file_operations,
7885 .getroot = nfs4_proc_get_root,
7886 .submount = nfs4_submount,
7887 .try_mount = nfs4_try_mount,
7888 .getattr = nfs4_proc_getattr,
7889 .setattr = nfs4_proc_setattr,
7890 .lookup = nfs4_proc_lookup,
7891 .access = nfs4_proc_access,
7892 .readlink = nfs4_proc_readlink,
7893 .create = nfs4_proc_create,
7894 .remove = nfs4_proc_remove,
7895 .unlink_setup = nfs4_proc_unlink_setup,
7896 .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
7897 .unlink_done = nfs4_proc_unlink_done,
7898 .rename = nfs4_proc_rename,
7899 .rename_setup = nfs4_proc_rename_setup,
7900 .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
7901 .rename_done = nfs4_proc_rename_done,
7902 .link = nfs4_proc_link,
7903 .symlink = nfs4_proc_symlink,
7904 .mkdir = nfs4_proc_mkdir,
7905 .rmdir = nfs4_proc_remove,
7906 .readdir = nfs4_proc_readdir,
7907 .mknod = nfs4_proc_mknod,
7908 .statfs = nfs4_proc_statfs,
7909 .fsinfo = nfs4_proc_fsinfo,
7910 .pathconf = nfs4_proc_pathconf,
7911 .set_capabilities = nfs4_server_capabilities,
7912 .decode_dirent = nfs4_decode_dirent,
7913 .read_setup = nfs4_proc_read_setup,
7914 .read_pageio_init = pnfs_pageio_init_read,
7915 .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
7916 .read_done = nfs4_read_done,
7917 .write_setup = nfs4_proc_write_setup,
7918 .write_pageio_init = pnfs_pageio_init_write,
7919 .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
7920 .write_done = nfs4_write_done,
7921 .commit_setup = nfs4_proc_commit_setup,
7922 .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
7923 .commit_done = nfs4_commit_done,
7924 .lock = nfs4_proc_lock,
7925 .clear_acl_cache = nfs4_zap_acl_attr,
7926 .close_context = nfs4_close_context,
7927 .open_context = nfs4_atomic_open,
7928 .have_delegation = nfs4_have_delegation,
7929 .return_delegation = nfs4_inode_return_delegation,
7930 .alloc_client = nfs4_alloc_client,
7931 .init_client = nfs4_init_client,
7932 .free_client = nfs4_free_client,
7933 .create_server = nfs4_create_server,
7934 .clone_server = nfs_clone_server,
7935};
7936
7937static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
7938 .prefix = XATTR_NAME_NFSV4_ACL,
7939 .list = nfs4_xattr_list_nfs4_acl,
7940 .get = nfs4_xattr_get_nfs4_acl,
7941 .set = nfs4_xattr_set_nfs4_acl,
7942};
7943
7944const struct xattr_handler *nfs4_xattr_handlers[] = {
7945 &nfs4_xattr_nfs4_acl_handler,
7946#ifdef CONFIG_NFS_V4_SECURITY_LABEL
7947 &nfs4_xattr_nfs4_label_handler,
7948#endif
7949 NULL
7950};
7951
7952/*
7953 * Local variables:
7954 * c-basic-offset: 8
7955 * End:
7956 */
Linux 6.x block layer and io_uring tree(s)