NFSv4: Prepare for minorversion-specific nfs_server capabilities
[deliverable/linux.git] / fs / nfs / nfs4state.c
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CommitLineData
1/*
2 * fs/nfs/nfs4state.c
3 *
4 * Client-side XDR 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 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 *
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its
21 * contributors may be used to endorse or promote products derived
22 * from this software without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
25 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
26 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
27 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
31 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
32 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
33 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
34 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35 *
36 * Implementation of the NFSv4 state model. For the time being,
37 * this is minimal, but will be made much more complex in a
38 * subsequent patch.
39 */
40
41#include <linux/kernel.h>
42#include <linux/slab.h>
43#include <linux/fs.h>
44#include <linux/nfs_fs.h>
45#include <linux/nfs_idmap.h>
46#include <linux/kthread.h>
47#include <linux/module.h>
48#include <linux/random.h>
49#include <linux/ratelimit.h>
50#include <linux/workqueue.h>
51#include <linux/bitops.h>
52#include <linux/jiffies.h>
53
54#include <linux/sunrpc/clnt.h>
55
56#include "nfs4_fs.h"
57#include "callback.h"
58#include "delegation.h"
59#include "internal.h"
60#include "nfs4session.h"
61#include "pnfs.h"
62#include "netns.h"
63
64#define NFSDBG_FACILITY NFSDBG_STATE
65
66#define OPENOWNER_POOL_SIZE 8
67
68const nfs4_stateid zero_stateid;
69static DEFINE_MUTEX(nfs_clid_init_mutex);
70
71int nfs4_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
72{
73 struct nfs4_setclientid_res clid = {
74 .clientid = clp->cl_clientid,
75 .confirm = clp->cl_confirm,
76 };
77 unsigned short port;
78 int status;
79 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
80
81 if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
82 goto do_confirm;
83 port = nn->nfs_callback_tcpport;
84 if (clp->cl_addr.ss_family == AF_INET6)
85 port = nn->nfs_callback_tcpport6;
86
87 status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
88 if (status != 0)
89 goto out;
90 clp->cl_clientid = clid.clientid;
91 clp->cl_confirm = clid.confirm;
92 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
93do_confirm:
94 status = nfs4_proc_setclientid_confirm(clp, &clid, cred);
95 if (status != 0)
96 goto out;
97 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
98 nfs4_schedule_state_renewal(clp);
99out:
100 return status;
101}
102
103/**
104 * nfs40_discover_server_trunking - Detect server IP address trunking (mv0)
105 *
106 * @clp: nfs_client under test
107 * @result: OUT: found nfs_client, or clp
108 * @cred: credential to use for trunking test
109 *
110 * Returns zero, a negative errno, or a negative NFS4ERR status.
111 * If zero is returned, an nfs_client pointer is planted in
112 * "result".
113 *
114 * Note: The returned client may not yet be marked ready.
115 */
116int nfs40_discover_server_trunking(struct nfs_client *clp,
117 struct nfs_client **result,
118 struct rpc_cred *cred)
119{
120 struct nfs4_setclientid_res clid = {
121 .clientid = clp->cl_clientid,
122 .confirm = clp->cl_confirm,
123 };
124 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
125 unsigned short port;
126 int status;
127
128 port = nn->nfs_callback_tcpport;
129 if (clp->cl_addr.ss_family == AF_INET6)
130 port = nn->nfs_callback_tcpport6;
131
132 status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
133 if (status != 0)
134 goto out;
135 clp->cl_clientid = clid.clientid;
136 clp->cl_confirm = clid.confirm;
137
138 status = nfs40_walk_client_list(clp, result, cred);
139 if (status == 0) {
140 /* Sustain the lease, even if it's empty. If the clientid4
141 * goes stale it's of no use for trunking discovery. */
142 nfs4_schedule_state_renewal(*result);
143 }
144out:
145 return status;
146}
147
148struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp)
149{
150 struct rpc_cred *cred = NULL;
151
152 if (clp->cl_machine_cred != NULL)
153 cred = get_rpccred(clp->cl_machine_cred);
154 return cred;
155}
156
157static void nfs4_clear_machine_cred(struct nfs_client *clp)
158{
159 struct rpc_cred *cred;
160
161 spin_lock(&clp->cl_lock);
162 cred = clp->cl_machine_cred;
163 clp->cl_machine_cred = NULL;
164 spin_unlock(&clp->cl_lock);
165 if (cred != NULL)
166 put_rpccred(cred);
167}
168
169static struct rpc_cred *
170nfs4_get_renew_cred_server_locked(struct nfs_server *server)
171{
172 struct rpc_cred *cred = NULL;
173 struct nfs4_state_owner *sp;
174 struct rb_node *pos;
175
176 for (pos = rb_first(&server->state_owners);
177 pos != NULL;
178 pos = rb_next(pos)) {
179 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
180 if (list_empty(&sp->so_states))
181 continue;
182 cred = get_rpccred(sp->so_cred);
183 break;
184 }
185 return cred;
186}
187
188/**
189 * nfs4_get_renew_cred_locked - Acquire credential for a renew operation
190 * @clp: client state handle
191 *
192 * Returns an rpc_cred with reference count bumped, or NULL.
193 * Caller must hold clp->cl_lock.
194 */
195struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp)
196{
197 struct rpc_cred *cred = NULL;
198 struct nfs_server *server;
199
200 /* Use machine credentials if available */
201 cred = nfs4_get_machine_cred_locked(clp);
202 if (cred != NULL)
203 goto out;
204
205 rcu_read_lock();
206 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
207 cred = nfs4_get_renew_cred_server_locked(server);
208 if (cred != NULL)
209 break;
210 }
211 rcu_read_unlock();
212
213out:
214 return cred;
215}
216
217#if defined(CONFIG_NFS_V4_1)
218
219static int nfs41_setup_state_renewal(struct nfs_client *clp)
220{
221 int status;
222 struct nfs_fsinfo fsinfo;
223
224 if (!test_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state)) {
225 nfs4_schedule_state_renewal(clp);
226 return 0;
227 }
228
229 status = nfs4_proc_get_lease_time(clp, &fsinfo);
230 if (status == 0) {
231 /* Update lease time and schedule renewal */
232 spin_lock(&clp->cl_lock);
233 clp->cl_lease_time = fsinfo.lease_time * HZ;
234 clp->cl_last_renewal = jiffies;
235 spin_unlock(&clp->cl_lock);
236
237 nfs4_schedule_state_renewal(clp);
238 }
239
240 return status;
241}
242
243/*
244 * Back channel returns NFS4ERR_DELAY for new requests when
245 * NFS4_SESSION_DRAINING is set so there is no work to be done when draining
246 * is ended.
247 */
248static void nfs4_end_drain_session(struct nfs_client *clp)
249{
250 struct nfs4_session *ses = clp->cl_session;
251 struct nfs4_slot_table *tbl;
252
253 if (ses == NULL)
254 return;
255 tbl = &ses->fc_slot_table;
256 if (test_and_clear_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
257 spin_lock(&tbl->slot_tbl_lock);
258 nfs41_wake_slot_table(tbl);
259 spin_unlock(&tbl->slot_tbl_lock);
260 }
261}
262
263/*
264 * Signal state manager thread if session fore channel is drained
265 */
266void nfs4_session_drain_complete(struct nfs4_session *session,
267 struct nfs4_slot_table *tbl)
268{
269 if (nfs4_session_draining(session))
270 complete(&tbl->complete);
271}
272
273static int nfs4_wait_on_slot_tbl(struct nfs4_slot_table *tbl)
274{
275 spin_lock(&tbl->slot_tbl_lock);
276 if (tbl->highest_used_slotid != NFS4_NO_SLOT) {
277 INIT_COMPLETION(tbl->complete);
278 spin_unlock(&tbl->slot_tbl_lock);
279 return wait_for_completion_interruptible(&tbl->complete);
280 }
281 spin_unlock(&tbl->slot_tbl_lock);
282 return 0;
283}
284
285static int nfs4_begin_drain_session(struct nfs_client *clp)
286{
287 struct nfs4_session *ses = clp->cl_session;
288 int ret = 0;
289
290 set_bit(NFS4_SESSION_DRAINING, &ses->session_state);
291 /* back channel */
292 ret = nfs4_wait_on_slot_tbl(&ses->bc_slot_table);
293 if (ret)
294 return ret;
295 /* fore channel */
296 return nfs4_wait_on_slot_tbl(&ses->fc_slot_table);
297}
298
299static void nfs41_finish_session_reset(struct nfs_client *clp)
300{
301 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
302 clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
303 /* create_session negotiated new slot table */
304 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
305 nfs41_setup_state_renewal(clp);
306}
307
308int nfs41_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
309{
310 int status;
311
312 if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
313 goto do_confirm;
314 nfs4_begin_drain_session(clp);
315 status = nfs4_proc_exchange_id(clp, cred);
316 if (status != 0)
317 goto out;
318 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
319do_confirm:
320 status = nfs4_proc_create_session(clp, cred);
321 if (status != 0)
322 goto out;
323 nfs41_finish_session_reset(clp);
324 nfs_mark_client_ready(clp, NFS_CS_READY);
325out:
326 return status;
327}
328
329/**
330 * nfs41_discover_server_trunking - Detect server IP address trunking (mv1)
331 *
332 * @clp: nfs_client under test
333 * @result: OUT: found nfs_client, or clp
334 * @cred: credential to use for trunking test
335 *
336 * Returns NFS4_OK, a negative errno, or a negative NFS4ERR status.
337 * If NFS4_OK is returned, an nfs_client pointer is planted in
338 * "result".
339 *
340 * Note: The returned client may not yet be marked ready.
341 */
342int nfs41_discover_server_trunking(struct nfs_client *clp,
343 struct nfs_client **result,
344 struct rpc_cred *cred)
345{
346 int status;
347
348 status = nfs4_proc_exchange_id(clp, cred);
349 if (status != NFS4_OK)
350 return status;
351 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
352
353 return nfs41_walk_client_list(clp, result, cred);
354}
355
356struct rpc_cred *nfs4_get_exchange_id_cred(struct nfs_client *clp)
357{
358 struct rpc_cred *cred;
359
360 spin_lock(&clp->cl_lock);
361 cred = nfs4_get_machine_cred_locked(clp);
362 spin_unlock(&clp->cl_lock);
363 return cred;
364}
365
366#endif /* CONFIG_NFS_V4_1 */
367
368static struct rpc_cred *
369nfs4_get_setclientid_cred_server(struct nfs_server *server)
370{
371 struct nfs_client *clp = server->nfs_client;
372 struct rpc_cred *cred = NULL;
373 struct nfs4_state_owner *sp;
374 struct rb_node *pos;
375
376 spin_lock(&clp->cl_lock);
377 pos = rb_first(&server->state_owners);
378 if (pos != NULL) {
379 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
380 cred = get_rpccred(sp->so_cred);
381 }
382 spin_unlock(&clp->cl_lock);
383 return cred;
384}
385
386/**
387 * nfs4_get_setclientid_cred - Acquire credential for a setclientid operation
388 * @clp: client state handle
389 *
390 * Returns an rpc_cred with reference count bumped, or NULL.
391 */
392struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp)
393{
394 struct nfs_server *server;
395 struct rpc_cred *cred;
396
397 spin_lock(&clp->cl_lock);
398 cred = nfs4_get_machine_cred_locked(clp);
399 spin_unlock(&clp->cl_lock);
400 if (cred != NULL)
401 goto out;
402
403 rcu_read_lock();
404 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
405 cred = nfs4_get_setclientid_cred_server(server);
406 if (cred != NULL)
407 break;
408 }
409 rcu_read_unlock();
410
411out:
412 return cred;
413}
414
415static struct nfs4_state_owner *
416nfs4_find_state_owner_locked(struct nfs_server *server, struct rpc_cred *cred)
417{
418 struct rb_node **p = &server->state_owners.rb_node,
419 *parent = NULL;
420 struct nfs4_state_owner *sp;
421
422 while (*p != NULL) {
423 parent = *p;
424 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
425
426 if (cred < sp->so_cred)
427 p = &parent->rb_left;
428 else if (cred > sp->so_cred)
429 p = &parent->rb_right;
430 else {
431 if (!list_empty(&sp->so_lru))
432 list_del_init(&sp->so_lru);
433 atomic_inc(&sp->so_count);
434 return sp;
435 }
436 }
437 return NULL;
438}
439
440static struct nfs4_state_owner *
441nfs4_insert_state_owner_locked(struct nfs4_state_owner *new)
442{
443 struct nfs_server *server = new->so_server;
444 struct rb_node **p = &server->state_owners.rb_node,
445 *parent = NULL;
446 struct nfs4_state_owner *sp;
447 int err;
448
449 while (*p != NULL) {
450 parent = *p;
451 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
452
453 if (new->so_cred < sp->so_cred)
454 p = &parent->rb_left;
455 else if (new->so_cred > sp->so_cred)
456 p = &parent->rb_right;
457 else {
458 if (!list_empty(&sp->so_lru))
459 list_del_init(&sp->so_lru);
460 atomic_inc(&sp->so_count);
461 return sp;
462 }
463 }
464 err = ida_get_new(&server->openowner_id, &new->so_seqid.owner_id);
465 if (err)
466 return ERR_PTR(err);
467 rb_link_node(&new->so_server_node, parent, p);
468 rb_insert_color(&new->so_server_node, &server->state_owners);
469 return new;
470}
471
472static void
473nfs4_remove_state_owner_locked(struct nfs4_state_owner *sp)
474{
475 struct nfs_server *server = sp->so_server;
476
477 if (!RB_EMPTY_NODE(&sp->so_server_node))
478 rb_erase(&sp->so_server_node, &server->state_owners);
479 ida_remove(&server->openowner_id, sp->so_seqid.owner_id);
480}
481
482static void
483nfs4_init_seqid_counter(struct nfs_seqid_counter *sc)
484{
485 sc->create_time = ktime_get();
486 sc->flags = 0;
487 sc->counter = 0;
488 spin_lock_init(&sc->lock);
489 INIT_LIST_HEAD(&sc->list);
490 rpc_init_wait_queue(&sc->wait, "Seqid_waitqueue");
491}
492
493static void
494nfs4_destroy_seqid_counter(struct nfs_seqid_counter *sc)
495{
496 rpc_destroy_wait_queue(&sc->wait);
497}
498
499/*
500 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
501 * create a new state_owner.
502 *
503 */
504static struct nfs4_state_owner *
505nfs4_alloc_state_owner(struct nfs_server *server,
506 struct rpc_cred *cred,
507 gfp_t gfp_flags)
508{
509 struct nfs4_state_owner *sp;
510
511 sp = kzalloc(sizeof(*sp), gfp_flags);
512 if (!sp)
513 return NULL;
514 sp->so_server = server;
515 sp->so_cred = get_rpccred(cred);
516 spin_lock_init(&sp->so_lock);
517 INIT_LIST_HEAD(&sp->so_states);
518 nfs4_init_seqid_counter(&sp->so_seqid);
519 atomic_set(&sp->so_count, 1);
520 INIT_LIST_HEAD(&sp->so_lru);
521 seqcount_init(&sp->so_reclaim_seqcount);
522 mutex_init(&sp->so_delegreturn_mutex);
523 return sp;
524}
525
526static void
527nfs4_drop_state_owner(struct nfs4_state_owner *sp)
528{
529 struct rb_node *rb_node = &sp->so_server_node;
530
531 if (!RB_EMPTY_NODE(rb_node)) {
532 struct nfs_server *server = sp->so_server;
533 struct nfs_client *clp = server->nfs_client;
534
535 spin_lock(&clp->cl_lock);
536 if (!RB_EMPTY_NODE(rb_node)) {
537 rb_erase(rb_node, &server->state_owners);
538 RB_CLEAR_NODE(rb_node);
539 }
540 spin_unlock(&clp->cl_lock);
541 }
542}
543
544static void nfs4_free_state_owner(struct nfs4_state_owner *sp)
545{
546 nfs4_destroy_seqid_counter(&sp->so_seqid);
547 put_rpccred(sp->so_cred);
548 kfree(sp);
549}
550
551static void nfs4_gc_state_owners(struct nfs_server *server)
552{
553 struct nfs_client *clp = server->nfs_client;
554 struct nfs4_state_owner *sp, *tmp;
555 unsigned long time_min, time_max;
556 LIST_HEAD(doomed);
557
558 spin_lock(&clp->cl_lock);
559 time_max = jiffies;
560 time_min = (long)time_max - (long)clp->cl_lease_time;
561 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
562 /* NB: LRU is sorted so that oldest is at the head */
563 if (time_in_range(sp->so_expires, time_min, time_max))
564 break;
565 list_move(&sp->so_lru, &doomed);
566 nfs4_remove_state_owner_locked(sp);
567 }
568 spin_unlock(&clp->cl_lock);
569
570 list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
571 list_del(&sp->so_lru);
572 nfs4_free_state_owner(sp);
573 }
574}
575
576/**
577 * nfs4_get_state_owner - Look up a state owner given a credential
578 * @server: nfs_server to search
579 * @cred: RPC credential to match
580 *
581 * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL.
582 */
583struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server,
584 struct rpc_cred *cred,
585 gfp_t gfp_flags)
586{
587 struct nfs_client *clp = server->nfs_client;
588 struct nfs4_state_owner *sp, *new;
589
590 spin_lock(&clp->cl_lock);
591 sp = nfs4_find_state_owner_locked(server, cred);
592 spin_unlock(&clp->cl_lock);
593 if (sp != NULL)
594 goto out;
595 new = nfs4_alloc_state_owner(server, cred, gfp_flags);
596 if (new == NULL)
597 goto out;
598 do {
599 if (ida_pre_get(&server->openowner_id, gfp_flags) == 0)
600 break;
601 spin_lock(&clp->cl_lock);
602 sp = nfs4_insert_state_owner_locked(new);
603 spin_unlock(&clp->cl_lock);
604 } while (sp == ERR_PTR(-EAGAIN));
605 if (sp != new)
606 nfs4_free_state_owner(new);
607out:
608 nfs4_gc_state_owners(server);
609 return sp;
610}
611
612/**
613 * nfs4_put_state_owner - Release a nfs4_state_owner
614 * @sp: state owner data to release
615 *
616 * Note that we keep released state owners on an LRU
617 * list.
618 * This caches valid state owners so that they can be
619 * reused, to avoid the OPEN_CONFIRM on minor version 0.
620 * It also pins the uniquifier of dropped state owners for
621 * a while, to ensure that those state owner names are
622 * never reused.
623 */
624void nfs4_put_state_owner(struct nfs4_state_owner *sp)
625{
626 struct nfs_server *server = sp->so_server;
627 struct nfs_client *clp = server->nfs_client;
628
629 if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
630 return;
631
632 sp->so_expires = jiffies;
633 list_add_tail(&sp->so_lru, &server->state_owners_lru);
634 spin_unlock(&clp->cl_lock);
635}
636
637/**
638 * nfs4_purge_state_owners - Release all cached state owners
639 * @server: nfs_server with cached state owners to release
640 *
641 * Called at umount time. Remaining state owners will be on
642 * the LRU with ref count of zero.
643 */
644void nfs4_purge_state_owners(struct nfs_server *server)
645{
646 struct nfs_client *clp = server->nfs_client;
647 struct nfs4_state_owner *sp, *tmp;
648 LIST_HEAD(doomed);
649
650 spin_lock(&clp->cl_lock);
651 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
652 list_move(&sp->so_lru, &doomed);
653 nfs4_remove_state_owner_locked(sp);
654 }
655 spin_unlock(&clp->cl_lock);
656
657 list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
658 list_del(&sp->so_lru);
659 nfs4_free_state_owner(sp);
660 }
661}
662
663static struct nfs4_state *
664nfs4_alloc_open_state(void)
665{
666 struct nfs4_state *state;
667
668 state = kzalloc(sizeof(*state), GFP_NOFS);
669 if (!state)
670 return NULL;
671 atomic_set(&state->count, 1);
672 INIT_LIST_HEAD(&state->lock_states);
673 spin_lock_init(&state->state_lock);
674 seqlock_init(&state->seqlock);
675 return state;
676}
677
678void
679nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode)
680{
681 if (state->state == fmode)
682 return;
683 /* NB! List reordering - see the reclaim code for why. */
684 if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) {
685 if (fmode & FMODE_WRITE)
686 list_move(&state->open_states, &state->owner->so_states);
687 else
688 list_move_tail(&state->open_states, &state->owner->so_states);
689 }
690 state->state = fmode;
691}
692
693static struct nfs4_state *
694__nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner)
695{
696 struct nfs_inode *nfsi = NFS_I(inode);
697 struct nfs4_state *state;
698
699 list_for_each_entry(state, &nfsi->open_states, inode_states) {
700 if (state->owner != owner)
701 continue;
702 if (!nfs4_valid_open_stateid(state))
703 continue;
704 if (atomic_inc_not_zero(&state->count))
705 return state;
706 }
707 return NULL;
708}
709
710static void
711nfs4_free_open_state(struct nfs4_state *state)
712{
713 kfree(state);
714}
715
716struct nfs4_state *
717nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
718{
719 struct nfs4_state *state, *new;
720 struct nfs_inode *nfsi = NFS_I(inode);
721
722 spin_lock(&inode->i_lock);
723 state = __nfs4_find_state_byowner(inode, owner);
724 spin_unlock(&inode->i_lock);
725 if (state)
726 goto out;
727 new = nfs4_alloc_open_state();
728 spin_lock(&owner->so_lock);
729 spin_lock(&inode->i_lock);
730 state = __nfs4_find_state_byowner(inode, owner);
731 if (state == NULL && new != NULL) {
732 state = new;
733 state->owner = owner;
734 atomic_inc(&owner->so_count);
735 list_add(&state->inode_states, &nfsi->open_states);
736 ihold(inode);
737 state->inode = inode;
738 spin_unlock(&inode->i_lock);
739 /* Note: The reclaim code dictates that we add stateless
740 * and read-only stateids to the end of the list */
741 list_add_tail(&state->open_states, &owner->so_states);
742 spin_unlock(&owner->so_lock);
743 } else {
744 spin_unlock(&inode->i_lock);
745 spin_unlock(&owner->so_lock);
746 if (new)
747 nfs4_free_open_state(new);
748 }
749out:
750 return state;
751}
752
753void nfs4_put_open_state(struct nfs4_state *state)
754{
755 struct inode *inode = state->inode;
756 struct nfs4_state_owner *owner = state->owner;
757
758 if (!atomic_dec_and_lock(&state->count, &owner->so_lock))
759 return;
760 spin_lock(&inode->i_lock);
761 list_del(&state->inode_states);
762 list_del(&state->open_states);
763 spin_unlock(&inode->i_lock);
764 spin_unlock(&owner->so_lock);
765 iput(inode);
766 nfs4_free_open_state(state);
767 nfs4_put_state_owner(owner);
768}
769
770/*
771 * Close the current file.
772 */
773static void __nfs4_close(struct nfs4_state *state,
774 fmode_t fmode, gfp_t gfp_mask, int wait)
775{
776 struct nfs4_state_owner *owner = state->owner;
777 int call_close = 0;
778 fmode_t newstate;
779
780 atomic_inc(&owner->so_count);
781 /* Protect against nfs4_find_state() */
782 spin_lock(&owner->so_lock);
783 switch (fmode & (FMODE_READ | FMODE_WRITE)) {
784 case FMODE_READ:
785 state->n_rdonly--;
786 break;
787 case FMODE_WRITE:
788 state->n_wronly--;
789 break;
790 case FMODE_READ|FMODE_WRITE:
791 state->n_rdwr--;
792 }
793 newstate = FMODE_READ|FMODE_WRITE;
794 if (state->n_rdwr == 0) {
795 if (state->n_rdonly == 0) {
796 newstate &= ~FMODE_READ;
797 call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
798 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
799 }
800 if (state->n_wronly == 0) {
801 newstate &= ~FMODE_WRITE;
802 call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
803 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
804 }
805 if (newstate == 0)
806 clear_bit(NFS_DELEGATED_STATE, &state->flags);
807 }
808 nfs4_state_set_mode_locked(state, newstate);
809 spin_unlock(&owner->so_lock);
810
811 if (!call_close) {
812 nfs4_put_open_state(state);
813 nfs4_put_state_owner(owner);
814 } else
815 nfs4_do_close(state, gfp_mask, wait);
816}
817
818void nfs4_close_state(struct nfs4_state *state, fmode_t fmode)
819{
820 __nfs4_close(state, fmode, GFP_NOFS, 0);
821}
822
823void nfs4_close_sync(struct nfs4_state *state, fmode_t fmode)
824{
825 __nfs4_close(state, fmode, GFP_KERNEL, 1);
826}
827
828/*
829 * Search the state->lock_states for an existing lock_owner
830 * that is compatible with current->files
831 */
832static struct nfs4_lock_state *
833__nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid, unsigned int type)
834{
835 struct nfs4_lock_state *pos;
836 list_for_each_entry(pos, &state->lock_states, ls_locks) {
837 if (type != NFS4_ANY_LOCK_TYPE && pos->ls_owner.lo_type != type)
838 continue;
839 switch (pos->ls_owner.lo_type) {
840 case NFS4_POSIX_LOCK_TYPE:
841 if (pos->ls_owner.lo_u.posix_owner != fl_owner)
842 continue;
843 break;
844 case NFS4_FLOCK_LOCK_TYPE:
845 if (pos->ls_owner.lo_u.flock_owner != fl_pid)
846 continue;
847 }
848 atomic_inc(&pos->ls_count);
849 return pos;
850 }
851 return NULL;
852}
853
854/*
855 * Return a compatible lock_state. If no initialized lock_state structure
856 * exists, return an uninitialized one.
857 *
858 */
859static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid, unsigned int type)
860{
861 struct nfs4_lock_state *lsp;
862 struct nfs_server *server = state->owner->so_server;
863
864 lsp = kzalloc(sizeof(*lsp), GFP_NOFS);
865 if (lsp == NULL)
866 return NULL;
867 nfs4_init_seqid_counter(&lsp->ls_seqid);
868 atomic_set(&lsp->ls_count, 1);
869 lsp->ls_state = state;
870 lsp->ls_owner.lo_type = type;
871 switch (lsp->ls_owner.lo_type) {
872 case NFS4_FLOCK_LOCK_TYPE:
873 lsp->ls_owner.lo_u.flock_owner = fl_pid;
874 break;
875 case NFS4_POSIX_LOCK_TYPE:
876 lsp->ls_owner.lo_u.posix_owner = fl_owner;
877 break;
878 default:
879 goto out_free;
880 }
881 lsp->ls_seqid.owner_id = ida_simple_get(&server->lockowner_id, 0, 0, GFP_NOFS);
882 if (lsp->ls_seqid.owner_id < 0)
883 goto out_free;
884 INIT_LIST_HEAD(&lsp->ls_locks);
885 return lsp;
886out_free:
887 kfree(lsp);
888 return NULL;
889}
890
891void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
892{
893 ida_simple_remove(&server->lockowner_id, lsp->ls_seqid.owner_id);
894 nfs4_destroy_seqid_counter(&lsp->ls_seqid);
895 kfree(lsp);
896}
897
898/*
899 * Return a compatible lock_state. If no initialized lock_state structure
900 * exists, return an uninitialized one.
901 *
902 */
903static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner, pid_t pid, unsigned int type)
904{
905 struct nfs4_lock_state *lsp, *new = NULL;
906
907 for(;;) {
908 spin_lock(&state->state_lock);
909 lsp = __nfs4_find_lock_state(state, owner, pid, type);
910 if (lsp != NULL)
911 break;
912 if (new != NULL) {
913 list_add(&new->ls_locks, &state->lock_states);
914 set_bit(LK_STATE_IN_USE, &state->flags);
915 lsp = new;
916 new = NULL;
917 break;
918 }
919 spin_unlock(&state->state_lock);
920 new = nfs4_alloc_lock_state(state, owner, pid, type);
921 if (new == NULL)
922 return NULL;
923 }
924 spin_unlock(&state->state_lock);
925 if (new != NULL)
926 nfs4_free_lock_state(state->owner->so_server, new);
927 return lsp;
928}
929
930/*
931 * Release reference to lock_state, and free it if we see that
932 * it is no longer in use
933 */
934void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
935{
936 struct nfs4_state *state;
937
938 if (lsp == NULL)
939 return;
940 state = lsp->ls_state;
941 if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock))
942 return;
943 list_del(&lsp->ls_locks);
944 if (list_empty(&state->lock_states))
945 clear_bit(LK_STATE_IN_USE, &state->flags);
946 spin_unlock(&state->state_lock);
947 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
948 if (nfs4_release_lockowner(lsp) == 0)
949 return;
950 }
951 nfs4_free_lock_state(lsp->ls_state->owner->so_server, lsp);
952}
953
954static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
955{
956 struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
957
958 dst->fl_u.nfs4_fl.owner = lsp;
959 atomic_inc(&lsp->ls_count);
960}
961
962static void nfs4_fl_release_lock(struct file_lock *fl)
963{
964 nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
965}
966
967static const struct file_lock_operations nfs4_fl_lock_ops = {
968 .fl_copy_lock = nfs4_fl_copy_lock,
969 .fl_release_private = nfs4_fl_release_lock,
970};
971
972int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
973{
974 struct nfs4_lock_state *lsp;
975
976 if (fl->fl_ops != NULL)
977 return 0;
978 if (fl->fl_flags & FL_POSIX)
979 lsp = nfs4_get_lock_state(state, fl->fl_owner, 0, NFS4_POSIX_LOCK_TYPE);
980 else if (fl->fl_flags & FL_FLOCK)
981 lsp = nfs4_get_lock_state(state, NULL, fl->fl_pid,
982 NFS4_FLOCK_LOCK_TYPE);
983 else
984 return -EINVAL;
985 if (lsp == NULL)
986 return -ENOMEM;
987 fl->fl_u.nfs4_fl.owner = lsp;
988 fl->fl_ops = &nfs4_fl_lock_ops;
989 return 0;
990}
991
992static int nfs4_copy_lock_stateid(nfs4_stateid *dst,
993 struct nfs4_state *state,
994 const struct nfs_lockowner *lockowner)
995{
996 struct nfs4_lock_state *lsp;
997 fl_owner_t fl_owner;
998 pid_t fl_pid;
999 int ret = -ENOENT;
1000
1001
1002 if (lockowner == NULL)
1003 goto out;
1004
1005 if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
1006 goto out;
1007
1008 fl_owner = lockowner->l_owner;
1009 fl_pid = lockowner->l_pid;
1010 spin_lock(&state->state_lock);
1011 lsp = __nfs4_find_lock_state(state, fl_owner, fl_pid, NFS4_ANY_LOCK_TYPE);
1012 if (lsp != NULL && test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) {
1013 nfs4_stateid_copy(dst, &lsp->ls_stateid);
1014 ret = 0;
1015 smp_rmb();
1016 if (!list_empty(&lsp->ls_seqid.list))
1017 ret = -EWOULDBLOCK;
1018 }
1019 spin_unlock(&state->state_lock);
1020 nfs4_put_lock_state(lsp);
1021out:
1022 return ret;
1023}
1024
1025static int nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state)
1026{
1027 int ret;
1028 int seq;
1029
1030 do {
1031 seq = read_seqbegin(&state->seqlock);
1032 nfs4_stateid_copy(dst, &state->stateid);
1033 ret = 0;
1034 smp_rmb();
1035 if (!list_empty(&state->owner->so_seqid.list))
1036 ret = -EWOULDBLOCK;
1037 } while (read_seqretry(&state->seqlock, seq));
1038 return ret;
1039}
1040
1041/*
1042 * Byte-range lock aware utility to initialize the stateid of read/write
1043 * requests.
1044 */
1045int nfs4_select_rw_stateid(nfs4_stateid *dst, struct nfs4_state *state,
1046 fmode_t fmode, const struct nfs_lockowner *lockowner)
1047{
1048 int ret = 0;
1049 if (nfs4_copy_delegation_stateid(dst, state->inode, fmode))
1050 goto out;
1051 ret = nfs4_copy_lock_stateid(dst, state, lockowner);
1052 if (ret != -ENOENT)
1053 goto out;
1054 ret = nfs4_copy_open_stateid(dst, state);
1055out:
1056 return ret;
1057}
1058
1059struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask)
1060{
1061 struct nfs_seqid *new;
1062
1063 new = kmalloc(sizeof(*new), gfp_mask);
1064 if (new != NULL) {
1065 new->sequence = counter;
1066 INIT_LIST_HEAD(&new->list);
1067 new->task = NULL;
1068 }
1069 return new;
1070}
1071
1072void nfs_release_seqid(struct nfs_seqid *seqid)
1073{
1074 struct nfs_seqid_counter *sequence;
1075
1076 if (list_empty(&seqid->list))
1077 return;
1078 sequence = seqid->sequence;
1079 spin_lock(&sequence->lock);
1080 list_del_init(&seqid->list);
1081 if (!list_empty(&sequence->list)) {
1082 struct nfs_seqid *next;
1083
1084 next = list_first_entry(&sequence->list,
1085 struct nfs_seqid, list);
1086 rpc_wake_up_queued_task(&sequence->wait, next->task);
1087 }
1088 spin_unlock(&sequence->lock);
1089}
1090
1091void nfs_free_seqid(struct nfs_seqid *seqid)
1092{
1093 nfs_release_seqid(seqid);
1094 kfree(seqid);
1095}
1096
1097/*
1098 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
1099 * failed with a seqid incrementing error -
1100 * see comments nfs_fs.h:seqid_mutating_error()
1101 */
1102static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
1103{
1104 switch (status) {
1105 case 0:
1106 break;
1107 case -NFS4ERR_BAD_SEQID:
1108 if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
1109 return;
1110 pr_warn_ratelimited("NFS: v4 server returned a bad"
1111 " sequence-id error on an"
1112 " unconfirmed sequence %p!\n",
1113 seqid->sequence);
1114 case -NFS4ERR_STALE_CLIENTID:
1115 case -NFS4ERR_STALE_STATEID:
1116 case -NFS4ERR_BAD_STATEID:
1117 case -NFS4ERR_BADXDR:
1118 case -NFS4ERR_RESOURCE:
1119 case -NFS4ERR_NOFILEHANDLE:
1120 /* Non-seqid mutating errors */
1121 return;
1122 };
1123 /*
1124 * Note: no locking needed as we are guaranteed to be first
1125 * on the sequence list
1126 */
1127 seqid->sequence->counter++;
1128}
1129
1130void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
1131{
1132 struct nfs4_state_owner *sp = container_of(seqid->sequence,
1133 struct nfs4_state_owner, so_seqid);
1134 struct nfs_server *server = sp->so_server;
1135
1136 if (status == -NFS4ERR_BAD_SEQID)
1137 nfs4_drop_state_owner(sp);
1138 if (!nfs4_has_session(server->nfs_client))
1139 nfs_increment_seqid(status, seqid);
1140}
1141
1142/*
1143 * Increment the seqid if the LOCK/LOCKU succeeded, or
1144 * failed with a seqid incrementing error -
1145 * see comments nfs_fs.h:seqid_mutating_error()
1146 */
1147void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
1148{
1149 nfs_increment_seqid(status, seqid);
1150}
1151
1152int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
1153{
1154 struct nfs_seqid_counter *sequence = seqid->sequence;
1155 int status = 0;
1156
1157 spin_lock(&sequence->lock);
1158 seqid->task = task;
1159 if (list_empty(&seqid->list))
1160 list_add_tail(&seqid->list, &sequence->list);
1161 if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid)
1162 goto unlock;
1163 rpc_sleep_on(&sequence->wait, task, NULL);
1164 status = -EAGAIN;
1165unlock:
1166 spin_unlock(&sequence->lock);
1167 return status;
1168}
1169
1170static int nfs4_run_state_manager(void *);
1171
1172static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
1173{
1174 smp_mb__before_clear_bit();
1175 clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
1176 smp_mb__after_clear_bit();
1177 wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING);
1178 rpc_wake_up(&clp->cl_rpcwaitq);
1179}
1180
1181/*
1182 * Schedule the nfs_client asynchronous state management routine
1183 */
1184void nfs4_schedule_state_manager(struct nfs_client *clp)
1185{
1186 struct task_struct *task;
1187 char buf[INET6_ADDRSTRLEN + sizeof("-manager") + 1];
1188
1189 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1190 return;
1191 __module_get(THIS_MODULE);
1192 atomic_inc(&clp->cl_count);
1193
1194 /* The rcu_read_lock() is not strictly necessary, as the state
1195 * manager is the only thread that ever changes the rpc_xprt
1196 * after it's initialized. At this point, we're single threaded. */
1197 rcu_read_lock();
1198 snprintf(buf, sizeof(buf), "%s-manager",
1199 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
1200 rcu_read_unlock();
1201 task = kthread_run(nfs4_run_state_manager, clp, buf);
1202 if (IS_ERR(task)) {
1203 printk(KERN_ERR "%s: kthread_run: %ld\n",
1204 __func__, PTR_ERR(task));
1205 nfs4_clear_state_manager_bit(clp);
1206 nfs_put_client(clp);
1207 module_put(THIS_MODULE);
1208 }
1209}
1210
1211/*
1212 * Schedule a lease recovery attempt
1213 */
1214void nfs4_schedule_lease_recovery(struct nfs_client *clp)
1215{
1216 if (!clp)
1217 return;
1218 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1219 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1220 dprintk("%s: scheduling lease recovery for server %s\n", __func__,
1221 clp->cl_hostname);
1222 nfs4_schedule_state_manager(clp);
1223}
1224EXPORT_SYMBOL_GPL(nfs4_schedule_lease_recovery);
1225
1226int nfs4_wait_clnt_recover(struct nfs_client *clp)
1227{
1228 int res;
1229
1230 might_sleep();
1231
1232 res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
1233 nfs_wait_bit_killable, TASK_KILLABLE);
1234 if (res)
1235 return res;
1236
1237 if (clp->cl_cons_state < 0)
1238 return clp->cl_cons_state;
1239 return 0;
1240}
1241
1242int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1243{
1244 unsigned int loop;
1245 int ret;
1246
1247 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1248 ret = nfs4_wait_clnt_recover(clp);
1249 if (ret != 0)
1250 break;
1251 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1252 !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1253 break;
1254 nfs4_schedule_state_manager(clp);
1255 ret = -EIO;
1256 }
1257 return ret;
1258}
1259
1260/*
1261 * nfs40_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN
1262 * @clp: client to process
1263 *
1264 * Set the NFS4CLNT_LEASE_EXPIRED state in order to force a
1265 * resend of the SETCLIENTID and hence re-establish the
1266 * callback channel. Then return all existing delegations.
1267 */
1268static void nfs40_handle_cb_pathdown(struct nfs_client *clp)
1269{
1270 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1271 nfs_expire_all_delegations(clp);
1272 dprintk("%s: handling CB_PATHDOWN recovery for server %s\n", __func__,
1273 clp->cl_hostname);
1274}
1275
1276void nfs4_schedule_path_down_recovery(struct nfs_client *clp)
1277{
1278 nfs40_handle_cb_pathdown(clp);
1279 nfs4_schedule_state_manager(clp);
1280}
1281
1282static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
1283{
1284
1285 set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1286 /* Don't recover state that expired before the reboot */
1287 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) {
1288 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1289 return 0;
1290 }
1291 set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags);
1292 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1293 return 1;
1294}
1295
1296static int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
1297{
1298 set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
1299 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1300 set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags);
1301 set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
1302 return 1;
1303}
1304
1305int nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state)
1306{
1307 struct nfs_client *clp = server->nfs_client;
1308
1309 if (!nfs4_valid_open_stateid(state))
1310 return -EBADF;
1311 nfs4_state_mark_reclaim_nograce(clp, state);
1312 dprintk("%s: scheduling stateid recovery for server %s\n", __func__,
1313 clp->cl_hostname);
1314 nfs4_schedule_state_manager(clp);
1315 return 0;
1316}
1317EXPORT_SYMBOL_GPL(nfs4_schedule_stateid_recovery);
1318
1319void nfs_inode_find_state_and_recover(struct inode *inode,
1320 const nfs4_stateid *stateid)
1321{
1322 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
1323 struct nfs_inode *nfsi = NFS_I(inode);
1324 struct nfs_open_context *ctx;
1325 struct nfs4_state *state;
1326 bool found = false;
1327
1328 spin_lock(&inode->i_lock);
1329 list_for_each_entry(ctx, &nfsi->open_files, list) {
1330 state = ctx->state;
1331 if (state == NULL)
1332 continue;
1333 if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
1334 continue;
1335 if (!nfs4_stateid_match(&state->stateid, stateid))
1336 continue;
1337 nfs4_state_mark_reclaim_nograce(clp, state);
1338 found = true;
1339 }
1340 spin_unlock(&inode->i_lock);
1341 if (found)
1342 nfs4_schedule_state_manager(clp);
1343}
1344
1345static void nfs4_state_mark_open_context_bad(struct nfs4_state *state)
1346{
1347 struct inode *inode = state->inode;
1348 struct nfs_inode *nfsi = NFS_I(inode);
1349 struct nfs_open_context *ctx;
1350
1351 spin_lock(&inode->i_lock);
1352 list_for_each_entry(ctx, &nfsi->open_files, list) {
1353 if (ctx->state != state)
1354 continue;
1355 set_bit(NFS_CONTEXT_BAD, &ctx->flags);
1356 }
1357 spin_unlock(&inode->i_lock);
1358}
1359
1360static void nfs4_state_mark_recovery_failed(struct nfs4_state *state, int error)
1361{
1362 set_bit(NFS_STATE_RECOVERY_FAILED, &state->flags);
1363 nfs4_state_mark_open_context_bad(state);
1364}
1365
1366
1367static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
1368{
1369 struct inode *inode = state->inode;
1370 struct nfs_inode *nfsi = NFS_I(inode);
1371 struct file_lock *fl;
1372 int status = 0;
1373
1374 if (inode->i_flock == NULL)
1375 return 0;
1376
1377 /* Guard against delegation returns and new lock/unlock calls */
1378 down_write(&nfsi->rwsem);
1379 /* Protect inode->i_flock using the BKL */
1380 lock_flocks();
1381 for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) {
1382 if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK)))
1383 continue;
1384 if (nfs_file_open_context(fl->fl_file)->state != state)
1385 continue;
1386 unlock_flocks();
1387 status = ops->recover_lock(state, fl);
1388 switch (status) {
1389 case 0:
1390 break;
1391 case -ESTALE:
1392 case -NFS4ERR_ADMIN_REVOKED:
1393 case -NFS4ERR_STALE_STATEID:
1394 case -NFS4ERR_BAD_STATEID:
1395 case -NFS4ERR_EXPIRED:
1396 case -NFS4ERR_NO_GRACE:
1397 case -NFS4ERR_STALE_CLIENTID:
1398 case -NFS4ERR_BADSESSION:
1399 case -NFS4ERR_BADSLOT:
1400 case -NFS4ERR_BAD_HIGH_SLOT:
1401 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1402 goto out;
1403 default:
1404 printk(KERN_ERR "NFS: %s: unhandled error %d. "
1405 "Zeroing state\n", __func__, status);
1406 case -ENOMEM:
1407 case -NFS4ERR_DENIED:
1408 case -NFS4ERR_RECLAIM_BAD:
1409 case -NFS4ERR_RECLAIM_CONFLICT:
1410 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1411 status = 0;
1412 }
1413 lock_flocks();
1414 }
1415 unlock_flocks();
1416out:
1417 up_write(&nfsi->rwsem);
1418 return status;
1419}
1420
1421static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops)
1422{
1423 struct nfs4_state *state;
1424 struct nfs4_lock_state *lock;
1425 int status = 0;
1426
1427 /* Note: we rely on the sp->so_states list being ordered
1428 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
1429 * states first.
1430 * This is needed to ensure that the server won't give us any
1431 * read delegations that we have to return if, say, we are
1432 * recovering after a network partition or a reboot from a
1433 * server that doesn't support a grace period.
1434 */
1435 spin_lock(&sp->so_lock);
1436 write_seqcount_begin(&sp->so_reclaim_seqcount);
1437restart:
1438 list_for_each_entry(state, &sp->so_states, open_states) {
1439 if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
1440 continue;
1441 if (!nfs4_valid_open_stateid(state))
1442 continue;
1443 if (state->state == 0)
1444 continue;
1445 atomic_inc(&state->count);
1446 spin_unlock(&sp->so_lock);
1447 status = ops->recover_open(sp, state);
1448 if (status >= 0) {
1449 status = nfs4_reclaim_locks(state, ops);
1450 if (status >= 0) {
1451 spin_lock(&state->state_lock);
1452 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1453 if (!test_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags))
1454 pr_warn_ratelimited("NFS: "
1455 "%s: Lock reclaim "
1456 "failed!\n", __func__);
1457 }
1458 spin_unlock(&state->state_lock);
1459 nfs4_put_open_state(state);
1460 spin_lock(&sp->so_lock);
1461 goto restart;
1462 }
1463 }
1464 switch (status) {
1465 default:
1466 printk(KERN_ERR "NFS: %s: unhandled error %d. "
1467 "Zeroing state\n", __func__, status);
1468 case -ENOENT:
1469 case -ENOMEM:
1470 case -ESTALE:
1471 /*
1472 * Open state on this file cannot be recovered
1473 * All we can do is revert to using the zero stateid.
1474 */
1475 nfs4_state_mark_recovery_failed(state, status);
1476 break;
1477 case -NFS4ERR_ADMIN_REVOKED:
1478 case -NFS4ERR_STALE_STATEID:
1479 case -NFS4ERR_BAD_STATEID:
1480 case -NFS4ERR_RECLAIM_BAD:
1481 case -NFS4ERR_RECLAIM_CONFLICT:
1482 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1483 break;
1484 case -NFS4ERR_EXPIRED:
1485 case -NFS4ERR_NO_GRACE:
1486 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1487 case -NFS4ERR_STALE_CLIENTID:
1488 case -NFS4ERR_BADSESSION:
1489 case -NFS4ERR_BADSLOT:
1490 case -NFS4ERR_BAD_HIGH_SLOT:
1491 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1492 goto out_err;
1493 }
1494 nfs4_put_open_state(state);
1495 spin_lock(&sp->so_lock);
1496 goto restart;
1497 }
1498 write_seqcount_end(&sp->so_reclaim_seqcount);
1499 spin_unlock(&sp->so_lock);
1500 return 0;
1501out_err:
1502 nfs4_put_open_state(state);
1503 spin_lock(&sp->so_lock);
1504 write_seqcount_end(&sp->so_reclaim_seqcount);
1505 spin_unlock(&sp->so_lock);
1506 return status;
1507}
1508
1509static void nfs4_clear_open_state(struct nfs4_state *state)
1510{
1511 struct nfs4_lock_state *lock;
1512
1513 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1514 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1515 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1516 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1517 spin_lock(&state->state_lock);
1518 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1519 lock->ls_seqid.flags = 0;
1520 clear_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags);
1521 }
1522 spin_unlock(&state->state_lock);
1523}
1524
1525static void nfs4_reset_seqids(struct nfs_server *server,
1526 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1527{
1528 struct nfs_client *clp = server->nfs_client;
1529 struct nfs4_state_owner *sp;
1530 struct rb_node *pos;
1531 struct nfs4_state *state;
1532
1533 spin_lock(&clp->cl_lock);
1534 for (pos = rb_first(&server->state_owners);
1535 pos != NULL;
1536 pos = rb_next(pos)) {
1537 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1538 sp->so_seqid.flags = 0;
1539 spin_lock(&sp->so_lock);
1540 list_for_each_entry(state, &sp->so_states, open_states) {
1541 if (mark_reclaim(clp, state))
1542 nfs4_clear_open_state(state);
1543 }
1544 spin_unlock(&sp->so_lock);
1545 }
1546 spin_unlock(&clp->cl_lock);
1547}
1548
1549static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp,
1550 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1551{
1552 struct nfs_server *server;
1553
1554 rcu_read_lock();
1555 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1556 nfs4_reset_seqids(server, mark_reclaim);
1557 rcu_read_unlock();
1558}
1559
1560static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
1561{
1562 /* Mark all delegations for reclaim */
1563 nfs_delegation_mark_reclaim(clp);
1564 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot);
1565}
1566
1567static void nfs4_reclaim_complete(struct nfs_client *clp,
1568 const struct nfs4_state_recovery_ops *ops)
1569{
1570 /* Notify the server we're done reclaiming our state */
1571 if (ops->reclaim_complete)
1572 (void)ops->reclaim_complete(clp);
1573}
1574
1575static void nfs4_clear_reclaim_server(struct nfs_server *server)
1576{
1577 struct nfs_client *clp = server->nfs_client;
1578 struct nfs4_state_owner *sp;
1579 struct rb_node *pos;
1580 struct nfs4_state *state;
1581
1582 spin_lock(&clp->cl_lock);
1583 for (pos = rb_first(&server->state_owners);
1584 pos != NULL;
1585 pos = rb_next(pos)) {
1586 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1587 spin_lock(&sp->so_lock);
1588 list_for_each_entry(state, &sp->so_states, open_states) {
1589 if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT,
1590 &state->flags))
1591 continue;
1592 nfs4_state_mark_reclaim_nograce(clp, state);
1593 }
1594 spin_unlock(&sp->so_lock);
1595 }
1596 spin_unlock(&clp->cl_lock);
1597}
1598
1599static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp)
1600{
1601 struct nfs_server *server;
1602
1603 if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1604 return 0;
1605
1606 rcu_read_lock();
1607 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1608 nfs4_clear_reclaim_server(server);
1609 rcu_read_unlock();
1610
1611 nfs_delegation_reap_unclaimed(clp);
1612 return 1;
1613}
1614
1615static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
1616{
1617 if (!nfs4_state_clear_reclaim_reboot(clp))
1618 return;
1619 nfs4_reclaim_complete(clp, clp->cl_mvops->reboot_recovery_ops);
1620}
1621
1622static void nfs_delegation_clear_all(struct nfs_client *clp)
1623{
1624 nfs_delegation_mark_reclaim(clp);
1625 nfs_delegation_reap_unclaimed(clp);
1626}
1627
1628static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
1629{
1630 nfs_delegation_clear_all(clp);
1631 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
1632}
1633
1634static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
1635{
1636 switch (error) {
1637 case 0:
1638 break;
1639 case -NFS4ERR_CB_PATH_DOWN:
1640 nfs40_handle_cb_pathdown(clp);
1641 break;
1642 case -NFS4ERR_NO_GRACE:
1643 nfs4_state_end_reclaim_reboot(clp);
1644 break;
1645 case -NFS4ERR_STALE_CLIENTID:
1646 case -NFS4ERR_LEASE_MOVED:
1647 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1648 nfs4_state_clear_reclaim_reboot(clp);
1649 nfs4_state_start_reclaim_reboot(clp);
1650 break;
1651 case -NFS4ERR_EXPIRED:
1652 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1653 nfs4_state_start_reclaim_nograce(clp);
1654 break;
1655 case -NFS4ERR_BADSESSION:
1656 case -NFS4ERR_BADSLOT:
1657 case -NFS4ERR_BAD_HIGH_SLOT:
1658 case -NFS4ERR_DEADSESSION:
1659 case -NFS4ERR_SEQ_FALSE_RETRY:
1660 case -NFS4ERR_SEQ_MISORDERED:
1661 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1662 /* Zero session reset errors */
1663 break;
1664 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1665 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
1666 break;
1667 default:
1668 dprintk("%s: failed to handle error %d for server %s\n",
1669 __func__, error, clp->cl_hostname);
1670 return error;
1671 }
1672 dprintk("%s: handled error %d for server %s\n", __func__, error,
1673 clp->cl_hostname);
1674 return 0;
1675}
1676
1677static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
1678{
1679 struct nfs4_state_owner *sp;
1680 struct nfs_server *server;
1681 struct rb_node *pos;
1682 int status = 0;
1683
1684restart:
1685 rcu_read_lock();
1686 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
1687 nfs4_purge_state_owners(server);
1688 spin_lock(&clp->cl_lock);
1689 for (pos = rb_first(&server->state_owners);
1690 pos != NULL;
1691 pos = rb_next(pos)) {
1692 sp = rb_entry(pos,
1693 struct nfs4_state_owner, so_server_node);
1694 if (!test_and_clear_bit(ops->owner_flag_bit,
1695 &sp->so_flags))
1696 continue;
1697 atomic_inc(&sp->so_count);
1698 spin_unlock(&clp->cl_lock);
1699 rcu_read_unlock();
1700
1701 status = nfs4_reclaim_open_state(sp, ops);
1702 if (status < 0) {
1703 set_bit(ops->owner_flag_bit, &sp->so_flags);
1704 nfs4_put_state_owner(sp);
1705 return nfs4_recovery_handle_error(clp, status);
1706 }
1707
1708 nfs4_put_state_owner(sp);
1709 goto restart;
1710 }
1711 spin_unlock(&clp->cl_lock);
1712 }
1713 rcu_read_unlock();
1714 return status;
1715}
1716
1717static int nfs4_check_lease(struct nfs_client *clp)
1718{
1719 struct rpc_cred *cred;
1720 const struct nfs4_state_maintenance_ops *ops =
1721 clp->cl_mvops->state_renewal_ops;
1722 int status;
1723
1724 /* Is the client already known to have an expired lease? */
1725 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1726 return 0;
1727 spin_lock(&clp->cl_lock);
1728 cred = ops->get_state_renewal_cred_locked(clp);
1729 spin_unlock(&clp->cl_lock);
1730 if (cred == NULL) {
1731 cred = nfs4_get_setclientid_cred(clp);
1732 status = -ENOKEY;
1733 if (cred == NULL)
1734 goto out;
1735 }
1736 status = ops->renew_lease(clp, cred);
1737 put_rpccred(cred);
1738out:
1739 return nfs4_recovery_handle_error(clp, status);
1740}
1741
1742/* Set NFS4CLNT_LEASE_EXPIRED and reclaim reboot state for all v4.0 errors
1743 * and for recoverable errors on EXCHANGE_ID for v4.1
1744 */
1745static int nfs4_handle_reclaim_lease_error(struct nfs_client *clp, int status)
1746{
1747 switch (status) {
1748 case -NFS4ERR_SEQ_MISORDERED:
1749 if (test_and_set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state))
1750 return -ESERVERFAULT;
1751 /* Lease confirmation error: retry after purging the lease */
1752 ssleep(1);
1753 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1754 break;
1755 case -NFS4ERR_STALE_CLIENTID:
1756 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1757 nfs4_state_clear_reclaim_reboot(clp);
1758 nfs4_state_start_reclaim_reboot(clp);
1759 break;
1760 case -NFS4ERR_CLID_INUSE:
1761 pr_err("NFS: Server %s reports our clientid is in use\n",
1762 clp->cl_hostname);
1763 nfs_mark_client_ready(clp, -EPERM);
1764 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1765 return -EPERM;
1766 case -EACCES:
1767 if (clp->cl_machine_cred == NULL)
1768 return -EACCES;
1769 /* Handle case where the user hasn't set up machine creds */
1770 nfs4_clear_machine_cred(clp);
1771 case -NFS4ERR_DELAY:
1772 case -ETIMEDOUT:
1773 case -EAGAIN:
1774 ssleep(1);
1775 break;
1776
1777 case -NFS4ERR_MINOR_VERS_MISMATCH:
1778 if (clp->cl_cons_state == NFS_CS_SESSION_INITING)
1779 nfs_mark_client_ready(clp, -EPROTONOSUPPORT);
1780 dprintk("%s: exit with error %d for server %s\n",
1781 __func__, -EPROTONOSUPPORT, clp->cl_hostname);
1782 return -EPROTONOSUPPORT;
1783 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
1784 * in nfs4_exchange_id */
1785 default:
1786 dprintk("%s: exit with error %d for server %s\n", __func__,
1787 status, clp->cl_hostname);
1788 return status;
1789 }
1790 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1791 dprintk("%s: handled error %d for server %s\n", __func__, status,
1792 clp->cl_hostname);
1793 return 0;
1794}
1795
1796static int nfs4_establish_lease(struct nfs_client *clp)
1797{
1798 struct rpc_cred *cred;
1799 const struct nfs4_state_recovery_ops *ops =
1800 clp->cl_mvops->reboot_recovery_ops;
1801 int status;
1802
1803 cred = ops->get_clid_cred(clp);
1804 if (cred == NULL)
1805 return -ENOENT;
1806 status = ops->establish_clid(clp, cred);
1807 put_rpccred(cred);
1808 if (status != 0)
1809 return status;
1810 pnfs_destroy_all_layouts(clp);
1811 return 0;
1812}
1813
1814/*
1815 * Returns zero or a negative errno. NFS4ERR values are converted
1816 * to local errno values.
1817 */
1818static int nfs4_reclaim_lease(struct nfs_client *clp)
1819{
1820 int status;
1821
1822 status = nfs4_establish_lease(clp);
1823 if (status < 0)
1824 return nfs4_handle_reclaim_lease_error(clp, status);
1825 if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state))
1826 nfs4_state_start_reclaim_nograce(clp);
1827 if (!test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
1828 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1829 clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1830 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1831 return 0;
1832}
1833
1834static int nfs4_purge_lease(struct nfs_client *clp)
1835{
1836 int status;
1837
1838 status = nfs4_establish_lease(clp);
1839 if (status < 0)
1840 return nfs4_handle_reclaim_lease_error(clp, status);
1841 clear_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
1842 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1843 nfs4_state_start_reclaim_nograce(clp);
1844 return 0;
1845}
1846
1847/**
1848 * nfs4_discover_server_trunking - Detect server IP address trunking
1849 *
1850 * @clp: nfs_client under test
1851 * @result: OUT: found nfs_client, or clp
1852 *
1853 * Returns zero or a negative errno. If zero is returned,
1854 * an nfs_client pointer is planted in "result".
1855 *
1856 * Note: since we are invoked in process context, and
1857 * not from inside the state manager, we cannot use
1858 * nfs4_handle_reclaim_lease_error().
1859 */
1860int nfs4_discover_server_trunking(struct nfs_client *clp,
1861 struct nfs_client **result)
1862{
1863 const struct nfs4_state_recovery_ops *ops =
1864 clp->cl_mvops->reboot_recovery_ops;
1865 rpc_authflavor_t *flavors, flav, save;
1866 struct rpc_clnt *clnt;
1867 struct rpc_cred *cred;
1868 int i, len, status;
1869
1870 dprintk("NFS: %s: testing '%s'\n", __func__, clp->cl_hostname);
1871
1872 len = NFS_MAX_SECFLAVORS;
1873 flavors = kcalloc(len, sizeof(*flavors), GFP_KERNEL);
1874 if (flavors == NULL) {
1875 status = -ENOMEM;
1876 goto out;
1877 }
1878 len = rpcauth_list_flavors(flavors, len);
1879 if (len < 0) {
1880 status = len;
1881 goto out_free;
1882 }
1883 clnt = clp->cl_rpcclient;
1884 save = clnt->cl_auth->au_flavor;
1885 i = 0;
1886
1887 mutex_lock(&nfs_clid_init_mutex);
1888 status = -ENOENT;
1889again:
1890 cred = ops->get_clid_cred(clp);
1891 if (cred == NULL)
1892 goto out_unlock;
1893
1894 status = ops->detect_trunking(clp, result, cred);
1895 put_rpccred(cred);
1896 switch (status) {
1897 case 0:
1898 break;
1899
1900 case -EACCES:
1901 if (clp->cl_machine_cred == NULL)
1902 break;
1903 /* Handle case where the user hasn't set up machine creds */
1904 nfs4_clear_machine_cred(clp);
1905 case -NFS4ERR_DELAY:
1906 case -ETIMEDOUT:
1907 case -EAGAIN:
1908 ssleep(1);
1909 case -NFS4ERR_STALE_CLIENTID:
1910 dprintk("NFS: %s after status %d, retrying\n",
1911 __func__, status);
1912 goto again;
1913
1914 case -NFS4ERR_CLID_INUSE:
1915 case -NFS4ERR_WRONGSEC:
1916 status = -EPERM;
1917 if (i >= len)
1918 break;
1919
1920 flav = flavors[i++];
1921 if (flav == save)
1922 flav = flavors[i++];
1923 clnt = rpc_clone_client_set_auth(clnt, flav);
1924 if (IS_ERR(clnt)) {
1925 status = PTR_ERR(clnt);
1926 break;
1927 }
1928 clp->cl_rpcclient = clnt;
1929 goto again;
1930
1931 case -NFS4ERR_MINOR_VERS_MISMATCH:
1932 status = -EPROTONOSUPPORT;
1933 break;
1934
1935 case -EKEYEXPIRED:
1936 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
1937 * in nfs4_exchange_id */
1938 status = -EKEYEXPIRED;
1939 }
1940
1941out_unlock:
1942 mutex_unlock(&nfs_clid_init_mutex);
1943out_free:
1944 kfree(flavors);
1945out:
1946 dprintk("NFS: %s: status = %d\n", __func__, status);
1947 return status;
1948}
1949
1950#ifdef CONFIG_NFS_V4_1
1951void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
1952{
1953 struct nfs_client *clp = session->clp;
1954
1955 switch (err) {
1956 default:
1957 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1958 break;
1959 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1960 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
1961 }
1962 nfs4_schedule_lease_recovery(clp);
1963}
1964EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery);
1965
1966static void nfs41_ping_server(struct nfs_client *clp)
1967{
1968 /* Use CHECK_LEASE to ping the server with a SEQUENCE */
1969 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1970 nfs4_schedule_state_manager(clp);
1971}
1972
1973void nfs41_server_notify_target_slotid_update(struct nfs_client *clp)
1974{
1975 nfs41_ping_server(clp);
1976}
1977
1978void nfs41_server_notify_highest_slotid_update(struct nfs_client *clp)
1979{
1980 nfs41_ping_server(clp);
1981}
1982
1983static void nfs4_reset_all_state(struct nfs_client *clp)
1984{
1985 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
1986 set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
1987 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1988 nfs4_state_start_reclaim_nograce(clp);
1989 dprintk("%s: scheduling reset of all state for server %s!\n",
1990 __func__, clp->cl_hostname);
1991 nfs4_schedule_state_manager(clp);
1992 }
1993}
1994
1995static void nfs41_handle_server_reboot(struct nfs_client *clp)
1996{
1997 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
1998 nfs4_state_start_reclaim_reboot(clp);
1999 dprintk("%s: server %s rebooted!\n", __func__,
2000 clp->cl_hostname);
2001 nfs4_schedule_state_manager(clp);
2002 }
2003}
2004
2005static void nfs41_handle_state_revoked(struct nfs_client *clp)
2006{
2007 nfs4_reset_all_state(clp);
2008 dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
2009}
2010
2011static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp)
2012{
2013 /* This will need to handle layouts too */
2014 nfs_expire_all_delegations(clp);
2015 dprintk("%s: Recallable state revoked on server %s!\n", __func__,
2016 clp->cl_hostname);
2017}
2018
2019static void nfs41_handle_backchannel_fault(struct nfs_client *clp)
2020{
2021 nfs_expire_all_delegations(clp);
2022 if (test_and_set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) == 0)
2023 nfs4_schedule_state_manager(clp);
2024 dprintk("%s: server %s declared a backchannel fault\n", __func__,
2025 clp->cl_hostname);
2026}
2027
2028static void nfs41_handle_cb_path_down(struct nfs_client *clp)
2029{
2030 if (test_and_set_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
2031 &clp->cl_state) == 0)
2032 nfs4_schedule_state_manager(clp);
2033}
2034
2035void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags)
2036{
2037 if (!flags)
2038 return;
2039
2040 dprintk("%s: \"%s\" (client ID %llx) flags=0x%08x\n",
2041 __func__, clp->cl_hostname, clp->cl_clientid, flags);
2042
2043 if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED)
2044 nfs41_handle_server_reboot(clp);
2045 if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED |
2046 SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED |
2047 SEQ4_STATUS_ADMIN_STATE_REVOKED |
2048 SEQ4_STATUS_LEASE_MOVED))
2049 nfs41_handle_state_revoked(clp);
2050 if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED)
2051 nfs41_handle_recallable_state_revoked(clp);
2052 if (flags & SEQ4_STATUS_BACKCHANNEL_FAULT)
2053 nfs41_handle_backchannel_fault(clp);
2054 else if (flags & (SEQ4_STATUS_CB_PATH_DOWN |
2055 SEQ4_STATUS_CB_PATH_DOWN_SESSION))
2056 nfs41_handle_cb_path_down(clp);
2057}
2058
2059static int nfs4_reset_session(struct nfs_client *clp)
2060{
2061 struct rpc_cred *cred;
2062 int status;
2063
2064 if (!nfs4_has_session(clp))
2065 return 0;
2066 nfs4_begin_drain_session(clp);
2067 cred = nfs4_get_exchange_id_cred(clp);
2068 status = nfs4_proc_destroy_session(clp->cl_session, cred);
2069 switch (status) {
2070 case 0:
2071 case -NFS4ERR_BADSESSION:
2072 case -NFS4ERR_DEADSESSION:
2073 break;
2074 case -NFS4ERR_BACK_CHAN_BUSY:
2075 case -NFS4ERR_DELAY:
2076 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2077 status = 0;
2078 ssleep(1);
2079 goto out;
2080 default:
2081 status = nfs4_recovery_handle_error(clp, status);
2082 goto out;
2083 }
2084
2085 memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
2086 status = nfs4_proc_create_session(clp, cred);
2087 if (status) {
2088 dprintk("%s: session reset failed with status %d for server %s!\n",
2089 __func__, status, clp->cl_hostname);
2090 status = nfs4_handle_reclaim_lease_error(clp, status);
2091 goto out;
2092 }
2093 nfs41_finish_session_reset(clp);
2094 dprintk("%s: session reset was successful for server %s!\n",
2095 __func__, clp->cl_hostname);
2096out:
2097 if (cred)
2098 put_rpccred(cred);
2099 return status;
2100}
2101
2102static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2103{
2104 struct rpc_cred *cred;
2105 int ret;
2106
2107 if (!nfs4_has_session(clp))
2108 return 0;
2109 nfs4_begin_drain_session(clp);
2110 cred = nfs4_get_exchange_id_cred(clp);
2111 ret = nfs4_proc_bind_conn_to_session(clp, cred);
2112 if (cred)
2113 put_rpccred(cred);
2114 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2115 switch (ret) {
2116 case 0:
2117 dprintk("%s: bind_conn_to_session was successful for server %s!\n",
2118 __func__, clp->cl_hostname);
2119 break;
2120 case -NFS4ERR_DELAY:
2121 ssleep(1);
2122 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2123 break;
2124 default:
2125 return nfs4_recovery_handle_error(clp, ret);
2126 }
2127 return 0;
2128}
2129#else /* CONFIG_NFS_V4_1 */
2130static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
2131static int nfs4_end_drain_session(struct nfs_client *clp) { return 0; }
2132
2133static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2134{
2135 return 0;
2136}
2137#endif /* CONFIG_NFS_V4_1 */
2138
2139static void nfs4_state_manager(struct nfs_client *clp)
2140{
2141 int status = 0;
2142 const char *section = "", *section_sep = "";
2143
2144 /* Ensure exclusive access to NFSv4 state */
2145 do {
2146 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
2147 section = "purge state";
2148 status = nfs4_purge_lease(clp);
2149 if (status < 0)
2150 goto out_error;
2151 continue;
2152 }
2153
2154 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
2155 section = "lease expired";
2156 /* We're going to have to re-establish a clientid */
2157 status = nfs4_reclaim_lease(clp);
2158 if (status < 0)
2159 goto out_error;
2160 continue;
2161 }
2162
2163 /* Initialize or reset the session */
2164 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) {
2165 section = "reset session";
2166 status = nfs4_reset_session(clp);
2167 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
2168 continue;
2169 if (status < 0)
2170 goto out_error;
2171 }
2172
2173 /* Send BIND_CONN_TO_SESSION */
2174 if (test_and_clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
2175 &clp->cl_state)) {
2176 section = "bind conn to session";
2177 status = nfs4_bind_conn_to_session(clp);
2178 if (status < 0)
2179 goto out_error;
2180 continue;
2181 }
2182
2183 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
2184 section = "check lease";
2185 status = nfs4_check_lease(clp);
2186 if (status < 0)
2187 goto out_error;
2188 continue;
2189 }
2190
2191 /* First recover reboot state... */
2192 if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
2193 section = "reclaim reboot";
2194 status = nfs4_do_reclaim(clp,
2195 clp->cl_mvops->reboot_recovery_ops);
2196 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
2197 test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
2198 continue;
2199 nfs4_state_end_reclaim_reboot(clp);
2200 if (test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
2201 continue;
2202 if (status < 0)
2203 goto out_error;
2204 }
2205
2206 /* Now recover expired state... */
2207 if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
2208 section = "reclaim nograce";
2209 status = nfs4_do_reclaim(clp,
2210 clp->cl_mvops->nograce_recovery_ops);
2211 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
2212 test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) ||
2213 test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
2214 continue;
2215 if (status < 0)
2216 goto out_error;
2217 }
2218
2219 nfs4_end_drain_session(clp);
2220 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
2221 nfs_client_return_marked_delegations(clp);
2222 continue;
2223 }
2224
2225 nfs4_clear_state_manager_bit(clp);
2226 /* Did we race with an attempt to give us more work? */
2227 if (clp->cl_state == 0)
2228 break;
2229 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
2230 break;
2231 } while (atomic_read(&clp->cl_count) > 1);
2232 return;
2233out_error:
2234 if (strlen(section))
2235 section_sep = ": ";
2236 pr_warn_ratelimited("NFS: state manager%s%s failed on NFSv4 server %s"
2237 " with error %d\n", section_sep, section,
2238 clp->cl_hostname, -status);
2239 ssleep(1);
2240 nfs4_end_drain_session(clp);
2241 nfs4_clear_state_manager_bit(clp);
2242}
2243
2244static int nfs4_run_state_manager(void *ptr)
2245{
2246 struct nfs_client *clp = ptr;
2247
2248 allow_signal(SIGKILL);
2249 nfs4_state_manager(clp);
2250 nfs_put_client(clp);
2251 module_put_and_exit(0);
2252 return 0;
2253}
2254
2255/*
2256 * Local variables:
2257 * c-basic-offset: 8
2258 * End:
2259 */
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