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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/kthread.h>
46#include <linux/module.h>
47#include <linux/random.h>
48#include <linux/ratelimit.h>
49#include <linux/workqueue.h>
50#include <linux/bitops.h>
51#include <linux/jiffies.h>
52#include <linux/sched/mm.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 "nfs4idmap.h"
61#include "nfs4session.h"
62#include "pnfs.h"
63#include "netns.h"
64#include "nfs4trace.h"
65
66#define NFSDBG_FACILITY NFSDBG_STATE
67
68#define OPENOWNER_POOL_SIZE 8
69
70static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp);
71
72const nfs4_stateid zero_stateid = {
73 { .data = { 0 } },
74 .type = NFS4_SPECIAL_STATEID_TYPE,
75};
76const nfs4_stateid invalid_stateid = {
77 {
78 /* Funky initialiser keeps older gcc versions happy */
79 .data = { 0xff, 0xff, 0xff, 0xff, 0 },
80 },
81 .type = NFS4_INVALID_STATEID_TYPE,
82};
83
84const nfs4_stateid current_stateid = {
85 {
86 /* Funky initialiser keeps older gcc versions happy */
87 .data = { 0x0, 0x0, 0x0, 0x1, 0 },
88 },
89 .type = NFS4_SPECIAL_STATEID_TYPE,
90};
91
92static DEFINE_MUTEX(nfs_clid_init_mutex);
93
94static int nfs4_setup_state_renewal(struct nfs_client *clp)
95{
96 int status;
97 struct nfs_fsinfo fsinfo;
98
99 if (!test_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state)) {
100 nfs4_schedule_state_renewal(clp);
101 return 0;
102 }
103
104 status = nfs4_proc_get_lease_time(clp, &fsinfo);
105 if (status == 0) {
106 nfs4_set_lease_period(clp, fsinfo.lease_time * HZ);
107 nfs4_schedule_state_renewal(clp);
108 }
109
110 return status;
111}
112
113int nfs4_init_clientid(struct nfs_client *clp, const struct cred *cred)
114{
115 struct nfs4_setclientid_res clid = {
116 .clientid = clp->cl_clientid,
117 .confirm = clp->cl_confirm,
118 };
119 unsigned short port;
120 int status;
121 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
122
123 if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
124 goto do_confirm;
125 port = nn->nfs_callback_tcpport;
126 if (clp->cl_addr.ss_family == AF_INET6)
127 port = nn->nfs_callback_tcpport6;
128
129 status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
130 if (status != 0)
131 goto out;
132 clp->cl_clientid = clid.clientid;
133 clp->cl_confirm = clid.confirm;
134 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
135do_confirm:
136 status = nfs4_proc_setclientid_confirm(clp, &clid, cred);
137 if (status != 0)
138 goto out;
139 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
140 nfs4_setup_state_renewal(clp);
141out:
142 return status;
143}
144
145/**
146 * nfs40_discover_server_trunking - Detect server IP address trunking (mv0)
147 *
148 * @clp: nfs_client under test
149 * @result: OUT: found nfs_client, or clp
150 * @cred: credential to use for trunking test
151 *
152 * Returns zero, a negative errno, or a negative NFS4ERR status.
153 * If zero is returned, an nfs_client pointer is planted in
154 * "result".
155 *
156 * Note: The returned client may not yet be marked ready.
157 */
158int nfs40_discover_server_trunking(struct nfs_client *clp,
159 struct nfs_client **result,
160 const struct cred *cred)
161{
162 struct nfs4_setclientid_res clid = {
163 .clientid = clp->cl_clientid,
164 .confirm = clp->cl_confirm,
165 };
166 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
167 unsigned short port;
168 int status;
169
170 port = nn->nfs_callback_tcpport;
171 if (clp->cl_addr.ss_family == AF_INET6)
172 port = nn->nfs_callback_tcpport6;
173
174 status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
175 if (status != 0)
176 goto out;
177 clp->cl_clientid = clid.clientid;
178 clp->cl_confirm = clid.confirm;
179
180 status = nfs40_walk_client_list(clp, result, cred);
181 if (status == 0) {
182 /* Sustain the lease, even if it's empty. If the clientid4
183 * goes stale it's of no use for trunking discovery. */
184 nfs4_schedule_state_renewal(*result);
185
186 /* If the client state need to recover, do it. */
187 if (clp->cl_state)
188 nfs4_schedule_state_manager(clp);
189 }
190out:
191 return status;
192}
193
194const struct cred *nfs4_get_machine_cred(struct nfs_client *clp)
195{
196 return get_cred(rpc_machine_cred());
197}
198
199static void nfs4_root_machine_cred(struct nfs_client *clp)
200{
201
202 /* Force root creds instead of machine */
203 clp->cl_principal = NULL;
204 clp->cl_rpcclient->cl_principal = NULL;
205}
206
207static const struct cred *
208nfs4_get_renew_cred_server_locked(struct nfs_server *server)
209{
210 const struct cred *cred = NULL;
211 struct nfs4_state_owner *sp;
212 struct rb_node *pos;
213
214 for (pos = rb_first(&server->state_owners);
215 pos != NULL;
216 pos = rb_next(pos)) {
217 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
218 if (list_empty(&sp->so_states))
219 continue;
220 cred = get_cred(sp->so_cred);
221 break;
222 }
223 return cred;
224}
225
226/**
227 * nfs4_get_renew_cred - Acquire credential for a renew operation
228 * @clp: client state handle
229 *
230 * Returns an rpc_cred with reference count bumped, or NULL.
231 * Caller must hold clp->cl_lock.
232 */
233const struct cred *nfs4_get_renew_cred(struct nfs_client *clp)
234{
235 const struct cred *cred = NULL;
236 struct nfs_server *server;
237
238 /* Use machine credentials if available */
239 cred = nfs4_get_machine_cred(clp);
240 if (cred != NULL)
241 goto out;
242
243 spin_lock(&clp->cl_lock);
244 rcu_read_lock();
245 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
246 cred = nfs4_get_renew_cred_server_locked(server);
247 if (cred != NULL)
248 break;
249 }
250 rcu_read_unlock();
251 spin_unlock(&clp->cl_lock);
252
253out:
254 return cred;
255}
256
257static void nfs4_end_drain_slot_table(struct nfs4_slot_table *tbl)
258{
259 if (test_and_clear_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) {
260 spin_lock(&tbl->slot_tbl_lock);
261 nfs41_wake_slot_table(tbl);
262 spin_unlock(&tbl->slot_tbl_lock);
263 }
264}
265
266static void nfs4_end_drain_session(struct nfs_client *clp)
267{
268 struct nfs4_session *ses = clp->cl_session;
269
270 if (clp->cl_slot_tbl) {
271 nfs4_end_drain_slot_table(clp->cl_slot_tbl);
272 return;
273 }
274
275 if (ses != NULL) {
276 nfs4_end_drain_slot_table(&ses->bc_slot_table);
277 nfs4_end_drain_slot_table(&ses->fc_slot_table);
278 }
279}
280
281static int nfs4_drain_slot_tbl(struct nfs4_slot_table *tbl)
282{
283 set_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state);
284 spin_lock(&tbl->slot_tbl_lock);
285 if (tbl->highest_used_slotid != NFS4_NO_SLOT) {
286 reinit_completion(&tbl->complete);
287 spin_unlock(&tbl->slot_tbl_lock);
288 return wait_for_completion_interruptible(&tbl->complete);
289 }
290 spin_unlock(&tbl->slot_tbl_lock);
291 return 0;
292}
293
294static int nfs4_begin_drain_session(struct nfs_client *clp)
295{
296 struct nfs4_session *ses = clp->cl_session;
297 int ret;
298
299 if (clp->cl_slot_tbl)
300 return nfs4_drain_slot_tbl(clp->cl_slot_tbl);
301
302 /* back channel */
303 ret = nfs4_drain_slot_tbl(&ses->bc_slot_table);
304 if (ret)
305 return ret;
306 /* fore channel */
307 return nfs4_drain_slot_tbl(&ses->fc_slot_table);
308}
309
310#if defined(CONFIG_NFS_V4_1)
311
312static void nfs41_finish_session_reset(struct nfs_client *clp)
313{
314 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
315 clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
316 /* create_session negotiated new slot table */
317 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
318 nfs4_setup_state_renewal(clp);
319}
320
321int nfs41_init_clientid(struct nfs_client *clp, const struct cred *cred)
322{
323 int status;
324
325 if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
326 goto do_confirm;
327 status = nfs4_proc_exchange_id(clp, cred);
328 if (status != 0)
329 goto out;
330 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
331do_confirm:
332 status = nfs4_proc_create_session(clp, cred);
333 if (status != 0)
334 goto out;
335 if (!(clp->cl_exchange_flags & EXCHGID4_FLAG_CONFIRMED_R))
336 nfs4_state_start_reclaim_reboot(clp);
337 nfs41_finish_session_reset(clp);
338 nfs_mark_client_ready(clp, NFS_CS_READY);
339out:
340 return status;
341}
342
343/**
344 * nfs41_discover_server_trunking - Detect server IP address trunking (mv1)
345 *
346 * @clp: nfs_client under test
347 * @result: OUT: found nfs_client, or clp
348 * @cred: credential to use for trunking test
349 *
350 * Returns NFS4_OK, a negative errno, or a negative NFS4ERR status.
351 * If NFS4_OK is returned, an nfs_client pointer is planted in
352 * "result".
353 *
354 * Note: The returned client may not yet be marked ready.
355 */
356int nfs41_discover_server_trunking(struct nfs_client *clp,
357 struct nfs_client **result,
358 const struct cred *cred)
359{
360 int status;
361
362 status = nfs4_proc_exchange_id(clp, cred);
363 if (status != NFS4_OK)
364 return status;
365
366 status = nfs41_walk_client_list(clp, result, cred);
367 if (status < 0)
368 return status;
369 if (clp != *result)
370 return 0;
371
372 /*
373 * Purge state if the client id was established in a prior
374 * instance and the client id could not have arrived on the
375 * server via Transparent State Migration.
376 */
377 if (clp->cl_exchange_flags & EXCHGID4_FLAG_CONFIRMED_R) {
378 if (!test_bit(NFS_CS_TSM_POSSIBLE, &clp->cl_flags))
379 set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
380 else
381 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
382 }
383 nfs4_schedule_state_manager(clp);
384 status = nfs_wait_client_init_complete(clp);
385 if (status < 0)
386 nfs_put_client(clp);
387 return status;
388}
389
390#endif /* CONFIG_NFS_V4_1 */
391
392/**
393 * nfs4_get_clid_cred - Acquire credential for a setclientid operation
394 * @clp: client state handle
395 *
396 * Returns a cred with reference count bumped, or NULL.
397 */
398const struct cred *nfs4_get_clid_cred(struct nfs_client *clp)
399{
400 const struct cred *cred;
401
402 cred = nfs4_get_machine_cred(clp);
403 return cred;
404}
405
406static struct nfs4_state_owner *
407nfs4_find_state_owner_locked(struct nfs_server *server, const struct cred *cred)
408{
409 struct rb_node **p = &server->state_owners.rb_node,
410 *parent = NULL;
411 struct nfs4_state_owner *sp;
412 int cmp;
413
414 while (*p != NULL) {
415 parent = *p;
416 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
417 cmp = cred_fscmp(cred, sp->so_cred);
418
419 if (cmp < 0)
420 p = &parent->rb_left;
421 else if (cmp > 0)
422 p = &parent->rb_right;
423 else {
424 if (!list_empty(&sp->so_lru))
425 list_del_init(&sp->so_lru);
426 atomic_inc(&sp->so_count);
427 return sp;
428 }
429 }
430 return NULL;
431}
432
433static struct nfs4_state_owner *
434nfs4_insert_state_owner_locked(struct nfs4_state_owner *new)
435{
436 struct nfs_server *server = new->so_server;
437 struct rb_node **p = &server->state_owners.rb_node,
438 *parent = NULL;
439 struct nfs4_state_owner *sp;
440 int cmp;
441
442 while (*p != NULL) {
443 parent = *p;
444 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
445 cmp = cred_fscmp(new->so_cred, sp->so_cred);
446
447 if (cmp < 0)
448 p = &parent->rb_left;
449 else if (cmp > 0)
450 p = &parent->rb_right;
451 else {
452 if (!list_empty(&sp->so_lru))
453 list_del_init(&sp->so_lru);
454 atomic_inc(&sp->so_count);
455 return sp;
456 }
457 }
458 rb_link_node(&new->so_server_node, parent, p);
459 rb_insert_color(&new->so_server_node, &server->state_owners);
460 return new;
461}
462
463static void
464nfs4_remove_state_owner_locked(struct nfs4_state_owner *sp)
465{
466 struct nfs_server *server = sp->so_server;
467
468 if (!RB_EMPTY_NODE(&sp->so_server_node))
469 rb_erase(&sp->so_server_node, &server->state_owners);
470}
471
472static void
473nfs4_init_seqid_counter(struct nfs_seqid_counter *sc)
474{
475 sc->create_time = ktime_get();
476 sc->flags = 0;
477 sc->counter = 0;
478 spin_lock_init(&sc->lock);
479 INIT_LIST_HEAD(&sc->list);
480 rpc_init_wait_queue(&sc->wait, "Seqid_waitqueue");
481}
482
483static void
484nfs4_destroy_seqid_counter(struct nfs_seqid_counter *sc)
485{
486 rpc_destroy_wait_queue(&sc->wait);
487}
488
489/*
490 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
491 * create a new state_owner.
492 *
493 */
494static struct nfs4_state_owner *
495nfs4_alloc_state_owner(struct nfs_server *server,
496 const struct cred *cred,
497 gfp_t gfp_flags)
498{
499 struct nfs4_state_owner *sp;
500
501 sp = kzalloc(sizeof(*sp), gfp_flags);
502 if (!sp)
503 return NULL;
504 sp->so_seqid.owner_id = atomic64_inc_return(&server->owner_ctr);
505 sp->so_server = server;
506 sp->so_cred = get_cred(cred);
507 spin_lock_init(&sp->so_lock);
508 INIT_LIST_HEAD(&sp->so_states);
509 nfs4_init_seqid_counter(&sp->so_seqid);
510 atomic_set(&sp->so_count, 1);
511 INIT_LIST_HEAD(&sp->so_lru);
512 mutex_init(&sp->so_delegreturn_mutex);
513 return sp;
514}
515
516static void
517nfs4_reset_state_owner(struct nfs4_state_owner *sp)
518{
519 /* This state_owner is no longer usable, but must
520 * remain in place so that state recovery can find it
521 * and the opens associated with it.
522 * It may also be used for new 'open' request to
523 * return a delegation to the server.
524 * So update the 'create_time' so that it looks like
525 * a new state_owner. This will cause the server to
526 * request an OPEN_CONFIRM to start a new sequence.
527 */
528 sp->so_seqid.create_time = ktime_get();
529}
530
531static void nfs4_free_state_owner(struct nfs4_state_owner *sp)
532{
533 nfs4_destroy_seqid_counter(&sp->so_seqid);
534 put_cred(sp->so_cred);
535 kfree(sp);
536}
537
538static void nfs4_gc_state_owners(struct nfs_server *server)
539{
540 struct nfs_client *clp = server->nfs_client;
541 struct nfs4_state_owner *sp, *tmp;
542 unsigned long time_min, time_max;
543 LIST_HEAD(doomed);
544
545 spin_lock(&clp->cl_lock);
546 time_max = jiffies;
547 time_min = (long)time_max - (long)clp->cl_lease_time;
548 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
549 /* NB: LRU is sorted so that oldest is at the head */
550 if (time_in_range(sp->so_expires, time_min, time_max))
551 break;
552 list_move(&sp->so_lru, &doomed);
553 nfs4_remove_state_owner_locked(sp);
554 }
555 spin_unlock(&clp->cl_lock);
556
557 list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
558 list_del(&sp->so_lru);
559 nfs4_free_state_owner(sp);
560 }
561}
562
563/**
564 * nfs4_get_state_owner - Look up a state owner given a credential
565 * @server: nfs_server to search
566 * @cred: RPC credential to match
567 * @gfp_flags: allocation mode
568 *
569 * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL.
570 */
571struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server,
572 const struct cred *cred,
573 gfp_t gfp_flags)
574{
575 struct nfs_client *clp = server->nfs_client;
576 struct nfs4_state_owner *sp, *new;
577
578 spin_lock(&clp->cl_lock);
579 sp = nfs4_find_state_owner_locked(server, cred);
580 spin_unlock(&clp->cl_lock);
581 if (sp != NULL)
582 goto out;
583 new = nfs4_alloc_state_owner(server, cred, gfp_flags);
584 if (new == NULL)
585 goto out;
586 spin_lock(&clp->cl_lock);
587 sp = nfs4_insert_state_owner_locked(new);
588 spin_unlock(&clp->cl_lock);
589 if (sp != new)
590 nfs4_free_state_owner(new);
591out:
592 nfs4_gc_state_owners(server);
593 return sp;
594}
595
596/**
597 * nfs4_put_state_owner - Release a nfs4_state_owner
598 * @sp: state owner data to release
599 *
600 * Note that we keep released state owners on an LRU
601 * list.
602 * This caches valid state owners so that they can be
603 * reused, to avoid the OPEN_CONFIRM on minor version 0.
604 * It also pins the uniquifier of dropped state owners for
605 * a while, to ensure that those state owner names are
606 * never reused.
607 */
608void nfs4_put_state_owner(struct nfs4_state_owner *sp)
609{
610 struct nfs_server *server = sp->so_server;
611 struct nfs_client *clp = server->nfs_client;
612
613 if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
614 return;
615
616 sp->so_expires = jiffies;
617 list_add_tail(&sp->so_lru, &server->state_owners_lru);
618 spin_unlock(&clp->cl_lock);
619}
620
621/**
622 * nfs4_purge_state_owners - Release all cached state owners
623 * @server: nfs_server with cached state owners to release
624 * @head: resulting list of state owners
625 *
626 * Called at umount time. Remaining state owners will be on
627 * the LRU with ref count of zero.
628 * Note that the state owners are not freed, but are added
629 * to the list @head, which can later be used as an argument
630 * to nfs4_free_state_owners.
631 */
632void nfs4_purge_state_owners(struct nfs_server *server, struct list_head *head)
633{
634 struct nfs_client *clp = server->nfs_client;
635 struct nfs4_state_owner *sp, *tmp;
636
637 spin_lock(&clp->cl_lock);
638 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
639 list_move(&sp->so_lru, head);
640 nfs4_remove_state_owner_locked(sp);
641 }
642 spin_unlock(&clp->cl_lock);
643}
644
645/**
646 * nfs4_free_state_owners - Release all cached state owners
647 * @head: resulting list of state owners
648 *
649 * Frees a list of state owners that was generated by
650 * nfs4_purge_state_owners
651 */
652void nfs4_free_state_owners(struct list_head *head)
653{
654 struct nfs4_state_owner *sp, *tmp;
655
656 list_for_each_entry_safe(sp, tmp, head, so_lru) {
657 list_del(&sp->so_lru);
658 nfs4_free_state_owner(sp);
659 }
660}
661
662static struct nfs4_state *
663nfs4_alloc_open_state(void)
664{
665 struct nfs4_state *state;
666
667 state = kzalloc(sizeof(*state), GFP_KERNEL_ACCOUNT);
668 if (!state)
669 return NULL;
670 refcount_set(&state->count, 1);
671 INIT_LIST_HEAD(&state->lock_states);
672 spin_lock_init(&state->state_lock);
673 seqlock_init(&state->seqlock);
674 init_waitqueue_head(&state->waitq);
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_rcu(state, &nfsi->open_states, inode_states) {
700 if (state->owner != owner)
701 continue;
702 if (!nfs4_valid_open_stateid(state))
703 continue;
704 if (refcount_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_rcu(state, rcu_head);
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 rcu_read_lock();
723 state = __nfs4_find_state_byowner(inode, owner);
724 rcu_read_unlock();
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 ihold(inode);
736 state->inode = inode;
737 list_add_rcu(&state->inode_states, &nfsi->open_states);
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 (!refcount_dec_and_lock(&state->count, &owner->so_lock))
759 return;
760 spin_lock(&inode->i_lock);
761 list_del_rcu(&state->inode_states);
762 list_del(&state->open_states);
763 spin_unlock(&inode->i_lock);
764 spin_unlock(&owner->so_lock);
765 nfs4_inode_return_delegation_on_close(inode);
766 iput(inode);
767 nfs4_free_open_state(state);
768 nfs4_put_state_owner(owner);
769}
770
771/*
772 * Close the current file.
773 */
774static void __nfs4_close(struct nfs4_state *state,
775 fmode_t fmode, gfp_t gfp_mask, int wait)
776{
777 struct nfs4_state_owner *owner = state->owner;
778 int call_close = 0;
779 fmode_t newstate;
780
781 atomic_inc(&owner->so_count);
782 /* Protect against nfs4_find_state() */
783 spin_lock(&owner->so_lock);
784 switch (fmode & (FMODE_READ | FMODE_WRITE)) {
785 case FMODE_READ:
786 state->n_rdonly--;
787 break;
788 case FMODE_WRITE:
789 state->n_wronly--;
790 break;
791 case FMODE_READ|FMODE_WRITE:
792 state->n_rdwr--;
793 }
794 newstate = FMODE_READ|FMODE_WRITE;
795 if (state->n_rdwr == 0) {
796 if (state->n_rdonly == 0) {
797 newstate &= ~FMODE_READ;
798 call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
799 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
800 }
801 if (state->n_wronly == 0) {
802 newstate &= ~FMODE_WRITE;
803 call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
804 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
805 }
806 if (newstate == 0)
807 clear_bit(NFS_DELEGATED_STATE, &state->flags);
808 }
809 nfs4_state_set_mode_locked(state, newstate);
810 spin_unlock(&owner->so_lock);
811
812 if (!call_close) {
813 nfs4_put_open_state(state);
814 nfs4_put_state_owner(owner);
815 } else
816 nfs4_do_close(state, gfp_mask, wait);
817}
818
819void nfs4_close_state(struct nfs4_state *state, fmode_t fmode)
820{
821 __nfs4_close(state, fmode, GFP_KERNEL, 0);
822}
823
824void nfs4_close_sync(struct nfs4_state *state, fmode_t fmode)
825{
826 __nfs4_close(state, fmode, GFP_KERNEL, 1);
827}
828
829/*
830 * Search the state->lock_states for an existing lock_owner
831 * that is compatible with either of the given owners.
832 * If the second is non-zero, then the first refers to a Posix-lock
833 * owner (current->files) and the second refers to a flock/OFD
834 * owner (struct file*). In that case, prefer a match for the first
835 * owner.
836 * If both sorts of locks are held on the one file we cannot know
837 * which stateid was intended to be used, so a "correct" choice cannot
838 * be made. Failing that, a "consistent" choice is preferable. The
839 * consistent choice we make is to prefer the first owner, that of a
840 * Posix lock.
841 */
842static struct nfs4_lock_state *
843__nfs4_find_lock_state(struct nfs4_state *state,
844 fl_owner_t owner, fl_owner_t owner2)
845{
846 struct nfs4_lock_state *pos, *ret = NULL;
847 list_for_each_entry(pos, &state->lock_states, ls_locks) {
848 if (pos->ls_owner == owner) {
849 ret = pos;
850 break;
851 }
852 if (pos->ls_owner == owner2)
853 ret = pos;
854 }
855 if (ret)
856 refcount_inc(&ret->ls_count);
857 return ret;
858}
859
860/*
861 * Return a compatible lock_state. If no initialized lock_state structure
862 * exists, return an uninitialized one.
863 *
864 */
865static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t owner)
866{
867 struct nfs4_lock_state *lsp;
868 struct nfs_server *server = state->owner->so_server;
869
870 lsp = kzalloc(sizeof(*lsp), GFP_KERNEL_ACCOUNT);
871 if (lsp == NULL)
872 return NULL;
873 nfs4_init_seqid_counter(&lsp->ls_seqid);
874 refcount_set(&lsp->ls_count, 1);
875 lsp->ls_state = state;
876 lsp->ls_owner = owner;
877 lsp->ls_seqid.owner_id = atomic64_inc_return(&server->owner_ctr);
878 INIT_LIST_HEAD(&lsp->ls_locks);
879 return lsp;
880}
881
882void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
883{
884 nfs4_destroy_seqid_counter(&lsp->ls_seqid);
885 kfree(lsp);
886}
887
888/*
889 * Return a compatible lock_state. If no initialized lock_state structure
890 * exists, return an uninitialized one.
891 *
892 */
893static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner)
894{
895 struct nfs4_lock_state *lsp, *new = NULL;
896
897 for(;;) {
898 spin_lock(&state->state_lock);
899 lsp = __nfs4_find_lock_state(state, owner, NULL);
900 if (lsp != NULL)
901 break;
902 if (new != NULL) {
903 list_add(&new->ls_locks, &state->lock_states);
904 set_bit(LK_STATE_IN_USE, &state->flags);
905 lsp = new;
906 new = NULL;
907 break;
908 }
909 spin_unlock(&state->state_lock);
910 new = nfs4_alloc_lock_state(state, owner);
911 if (new == NULL)
912 return NULL;
913 }
914 spin_unlock(&state->state_lock);
915 if (new != NULL)
916 nfs4_free_lock_state(state->owner->so_server, new);
917 return lsp;
918}
919
920/*
921 * Release reference to lock_state, and free it if we see that
922 * it is no longer in use
923 */
924void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
925{
926 struct nfs_server *server;
927 struct nfs4_state *state;
928
929 if (lsp == NULL)
930 return;
931 state = lsp->ls_state;
932 if (!refcount_dec_and_lock(&lsp->ls_count, &state->state_lock))
933 return;
934 list_del(&lsp->ls_locks);
935 if (list_empty(&state->lock_states))
936 clear_bit(LK_STATE_IN_USE, &state->flags);
937 spin_unlock(&state->state_lock);
938 server = state->owner->so_server;
939 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
940 struct nfs_client *clp = server->nfs_client;
941
942 clp->cl_mvops->free_lock_state(server, lsp);
943 } else
944 nfs4_free_lock_state(server, lsp);
945}
946
947static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
948{
949 struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
950
951 dst->fl_u.nfs4_fl.owner = lsp;
952 refcount_inc(&lsp->ls_count);
953}
954
955static void nfs4_fl_release_lock(struct file_lock *fl)
956{
957 nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
958}
959
960static const struct file_lock_operations nfs4_fl_lock_ops = {
961 .fl_copy_lock = nfs4_fl_copy_lock,
962 .fl_release_private = nfs4_fl_release_lock,
963};
964
965int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
966{
967 struct nfs4_lock_state *lsp;
968
969 if (fl->fl_ops != NULL)
970 return 0;
971 lsp = nfs4_get_lock_state(state, fl->c.flc_owner);
972 if (lsp == NULL)
973 return -ENOMEM;
974 fl->fl_u.nfs4_fl.owner = lsp;
975 fl->fl_ops = &nfs4_fl_lock_ops;
976 return 0;
977}
978
979static int nfs4_copy_lock_stateid(nfs4_stateid *dst,
980 struct nfs4_state *state,
981 const struct nfs_lock_context *l_ctx)
982{
983 struct nfs4_lock_state *lsp;
984 fl_owner_t owner, fl_flock_owner;
985 int ret = -ENOENT;
986
987 if (l_ctx == NULL)
988 goto out;
989
990 if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
991 goto out;
992
993 owner = l_ctx->lockowner;
994 fl_flock_owner = l_ctx->open_context->flock_owner;
995
996 spin_lock(&state->state_lock);
997 lsp = __nfs4_find_lock_state(state, owner, fl_flock_owner);
998 if (lsp && test_bit(NFS_LOCK_LOST, &lsp->ls_flags))
999 ret = -EIO;
1000 else if (lsp != NULL && test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) {
1001 nfs4_stateid_copy(dst, &lsp->ls_stateid);
1002 ret = 0;
1003 }
1004 spin_unlock(&state->state_lock);
1005 nfs4_put_lock_state(lsp);
1006out:
1007 return ret;
1008}
1009
1010bool nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state)
1011{
1012 bool ret;
1013 const nfs4_stateid *src;
1014 int seq;
1015
1016 do {
1017 ret = false;
1018 src = &zero_stateid;
1019 seq = read_seqbegin(&state->seqlock);
1020 if (test_bit(NFS_OPEN_STATE, &state->flags)) {
1021 src = &state->open_stateid;
1022 ret = true;
1023 }
1024 nfs4_stateid_copy(dst, src);
1025 } while (read_seqretry(&state->seqlock, seq));
1026 return ret;
1027}
1028
1029/*
1030 * Byte-range lock aware utility to initialize the stateid of read/write
1031 * requests.
1032 */
1033int nfs4_select_rw_stateid(struct nfs4_state *state,
1034 fmode_t fmode, const struct nfs_lock_context *l_ctx,
1035 nfs4_stateid *dst, const struct cred **cred)
1036{
1037 int ret;
1038
1039 if (!nfs4_valid_open_stateid(state))
1040 return -EIO;
1041 if (cred != NULL)
1042 *cred = NULL;
1043 ret = nfs4_copy_lock_stateid(dst, state, l_ctx);
1044 if (ret == -EIO)
1045 /* A lost lock - don't even consider delegations */
1046 goto out;
1047 /* returns true if delegation stateid found and copied */
1048 if (nfs4_copy_delegation_stateid(state->inode, fmode, dst, cred)) {
1049 ret = 0;
1050 goto out;
1051 }
1052 if (ret != -ENOENT)
1053 /* nfs4_copy_delegation_stateid() didn't over-write
1054 * dst, so it still has the lock stateid which we now
1055 * choose to use.
1056 */
1057 goto out;
1058 ret = nfs4_copy_open_stateid(dst, state) ? 0 : -EAGAIN;
1059out:
1060 if (nfs_server_capable(state->inode, NFS_CAP_STATEID_NFSV41))
1061 dst->seqid = 0;
1062 return ret;
1063}
1064
1065struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask)
1066{
1067 struct nfs_seqid *new;
1068
1069 new = kmalloc(sizeof(*new), gfp_mask);
1070 if (new == NULL)
1071 return ERR_PTR(-ENOMEM);
1072 new->sequence = counter;
1073 INIT_LIST_HEAD(&new->list);
1074 new->task = NULL;
1075 return new;
1076}
1077
1078void nfs_release_seqid(struct nfs_seqid *seqid)
1079{
1080 struct nfs_seqid_counter *sequence;
1081
1082 if (seqid == NULL || list_empty(&seqid->list))
1083 return;
1084 sequence = seqid->sequence;
1085 spin_lock(&sequence->lock);
1086 if (list_is_first(&seqid->list, &sequence->list) &&
1087 !list_is_singular(&sequence->list)) {
1088 struct nfs_seqid *next = list_next_entry(seqid, list);
1089 rpc_wake_up_queued_task(&sequence->wait, next->task);
1090 }
1091 list_del_init(&seqid->list);
1092 spin_unlock(&sequence->lock);
1093}
1094
1095void nfs_free_seqid(struct nfs_seqid *seqid)
1096{
1097 nfs_release_seqid(seqid);
1098 kfree(seqid);
1099}
1100
1101/*
1102 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
1103 * failed with a seqid incrementing error -
1104 * see comments nfs4.h:seqid_mutating_error()
1105 */
1106static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
1107{
1108 switch (status) {
1109 case 0:
1110 break;
1111 case -NFS4ERR_BAD_SEQID:
1112 if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
1113 return;
1114 pr_warn_ratelimited("NFS: v4 server returned a bad"
1115 " sequence-id error on an"
1116 " unconfirmed sequence %p!\n",
1117 seqid->sequence);
1118 return;
1119 case -NFS4ERR_STALE_CLIENTID:
1120 case -NFS4ERR_STALE_STATEID:
1121 case -NFS4ERR_BAD_STATEID:
1122 case -NFS4ERR_BADXDR:
1123 case -NFS4ERR_RESOURCE:
1124 case -NFS4ERR_NOFILEHANDLE:
1125 case -NFS4ERR_MOVED:
1126 /* Non-seqid mutating errors */
1127 return;
1128 }
1129 /*
1130 * Note: no locking needed as we are guaranteed to be first
1131 * on the sequence list
1132 */
1133 seqid->sequence->counter++;
1134}
1135
1136void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
1137{
1138 struct nfs4_state_owner *sp;
1139
1140 if (seqid == NULL)
1141 return;
1142
1143 sp = container_of(seqid->sequence, struct nfs4_state_owner, so_seqid);
1144 if (status == -NFS4ERR_BAD_SEQID)
1145 nfs4_reset_state_owner(sp);
1146 if (!nfs4_has_session(sp->so_server->nfs_client))
1147 nfs_increment_seqid(status, seqid);
1148}
1149
1150/*
1151 * Increment the seqid if the LOCK/LOCKU succeeded, or
1152 * failed with a seqid incrementing error -
1153 * see comments nfs4.h:seqid_mutating_error()
1154 */
1155void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
1156{
1157 if (seqid != NULL)
1158 nfs_increment_seqid(status, seqid);
1159}
1160
1161int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
1162{
1163 struct nfs_seqid_counter *sequence;
1164 int status = 0;
1165
1166 if (seqid == NULL)
1167 goto out;
1168 sequence = seqid->sequence;
1169 spin_lock(&sequence->lock);
1170 seqid->task = task;
1171 if (list_empty(&seqid->list))
1172 list_add_tail(&seqid->list, &sequence->list);
1173 if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid)
1174 goto unlock;
1175 rpc_sleep_on(&sequence->wait, task, NULL);
1176 status = -EAGAIN;
1177unlock:
1178 spin_unlock(&sequence->lock);
1179out:
1180 return status;
1181}
1182
1183static int nfs4_run_state_manager(void *);
1184
1185static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
1186{
1187 clear_and_wake_up_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
1188 rpc_wake_up(&clp->cl_rpcwaitq);
1189}
1190
1191/*
1192 * Schedule the nfs_client asynchronous state management routine
1193 */
1194void nfs4_schedule_state_manager(struct nfs_client *clp)
1195{
1196 struct task_struct *task;
1197 char buf[INET6_ADDRSTRLEN + sizeof("-manager") + 1];
1198 struct rpc_clnt *clnt = clp->cl_rpcclient;
1199 bool swapon = false;
1200
1201 if (clnt->cl_shutdown)
1202 return;
1203
1204 set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
1205
1206 if (atomic_read(&clnt->cl_swapper)) {
1207 swapon = !test_and_set_bit(NFS4CLNT_MANAGER_AVAILABLE,
1208 &clp->cl_state);
1209 if (!swapon) {
1210 wake_up_var(&clp->cl_state);
1211 return;
1212 }
1213 }
1214
1215 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1216 return;
1217
1218 __module_get(THIS_MODULE);
1219 refcount_inc(&clp->cl_count);
1220
1221 /* The rcu_read_lock() is not strictly necessary, as the state
1222 * manager is the only thread that ever changes the rpc_xprt
1223 * after it's initialized. At this point, we're single threaded. */
1224 rcu_read_lock();
1225 snprintf(buf, sizeof(buf), "%s-manager",
1226 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
1227 rcu_read_unlock();
1228 task = kthread_run(nfs4_run_state_manager, clp, "%s", buf);
1229 if (IS_ERR(task)) {
1230 printk(KERN_ERR "%s: kthread_run: %ld\n",
1231 __func__, PTR_ERR(task));
1232 if (!nfs_client_init_is_complete(clp))
1233 nfs_mark_client_ready(clp, PTR_ERR(task));
1234 if (swapon)
1235 clear_bit(NFS4CLNT_MANAGER_AVAILABLE, &clp->cl_state);
1236 nfs4_clear_state_manager_bit(clp);
1237 nfs_put_client(clp);
1238 module_put(THIS_MODULE);
1239 }
1240}
1241
1242/*
1243 * Schedule a lease recovery attempt
1244 */
1245void nfs4_schedule_lease_recovery(struct nfs_client *clp)
1246{
1247 if (!clp)
1248 return;
1249 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1250 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1251 dprintk("%s: scheduling lease recovery for server %s\n", __func__,
1252 clp->cl_hostname);
1253 nfs4_schedule_state_manager(clp);
1254}
1255EXPORT_SYMBOL_GPL(nfs4_schedule_lease_recovery);
1256
1257/**
1258 * nfs4_schedule_migration_recovery - trigger migration recovery
1259 *
1260 * @server: FSID that is migrating
1261 *
1262 * Returns zero if recovery has started, otherwise a negative NFS4ERR
1263 * value is returned.
1264 */
1265int nfs4_schedule_migration_recovery(const struct nfs_server *server)
1266{
1267 struct nfs_client *clp = server->nfs_client;
1268
1269 if (server->fh_expire_type != NFS4_FH_PERSISTENT) {
1270 pr_err("NFS: volatile file handles not supported (server %s)\n",
1271 clp->cl_hostname);
1272 return -NFS4ERR_IO;
1273 }
1274
1275 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
1276 return -NFS4ERR_IO;
1277
1278 dprintk("%s: scheduling migration recovery for (%llx:%llx) on %s\n",
1279 __func__,
1280 (unsigned long long)server->fsid.major,
1281 (unsigned long long)server->fsid.minor,
1282 clp->cl_hostname);
1283
1284 set_bit(NFS_MIG_IN_TRANSITION,
1285 &((struct nfs_server *)server)->mig_status);
1286 set_bit(NFS4CLNT_MOVED, &clp->cl_state);
1287
1288 nfs4_schedule_state_manager(clp);
1289 return 0;
1290}
1291EXPORT_SYMBOL_GPL(nfs4_schedule_migration_recovery);
1292
1293/**
1294 * nfs4_schedule_lease_moved_recovery - start lease-moved recovery
1295 *
1296 * @clp: server to check for moved leases
1297 *
1298 */
1299void nfs4_schedule_lease_moved_recovery(struct nfs_client *clp)
1300{
1301 dprintk("%s: scheduling lease-moved recovery for client ID %llx on %s\n",
1302 __func__, clp->cl_clientid, clp->cl_hostname);
1303
1304 set_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state);
1305 nfs4_schedule_state_manager(clp);
1306}
1307EXPORT_SYMBOL_GPL(nfs4_schedule_lease_moved_recovery);
1308
1309int nfs4_wait_clnt_recover(struct nfs_client *clp)
1310{
1311 int res;
1312
1313 might_sleep();
1314
1315 refcount_inc(&clp->cl_count);
1316 res = wait_on_bit_action(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
1317 nfs_wait_bit_killable,
1318 TASK_KILLABLE|TASK_FREEZABLE_UNSAFE);
1319 if (res)
1320 goto out;
1321 if (clp->cl_cons_state < 0)
1322 res = clp->cl_cons_state;
1323out:
1324 nfs_put_client(clp);
1325 return res;
1326}
1327
1328int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1329{
1330 unsigned int loop;
1331 int ret;
1332
1333 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1334 ret = nfs4_wait_clnt_recover(clp);
1335 if (ret != 0)
1336 break;
1337 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1338 !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1339 break;
1340 nfs4_schedule_state_manager(clp);
1341 ret = -EIO;
1342 }
1343 return ret;
1344}
1345
1346/*
1347 * nfs40_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN
1348 * @clp: client to process
1349 *
1350 * Set the NFS4CLNT_LEASE_EXPIRED state in order to force a
1351 * resend of the SETCLIENTID and hence re-establish the
1352 * callback channel. Then return all existing delegations.
1353 */
1354static void nfs40_handle_cb_pathdown(struct nfs_client *clp)
1355{
1356 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1357 nfs_expire_all_delegations(clp);
1358 dprintk("%s: handling CB_PATHDOWN recovery for server %s\n", __func__,
1359 clp->cl_hostname);
1360}
1361
1362void nfs4_schedule_path_down_recovery(struct nfs_client *clp)
1363{
1364 nfs40_handle_cb_pathdown(clp);
1365 nfs4_schedule_state_manager(clp);
1366}
1367
1368static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
1369{
1370
1371 if (!nfs4_valid_open_stateid(state))
1372 return 0;
1373 set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1374 /* Don't recover state that expired before the reboot */
1375 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) {
1376 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1377 return 0;
1378 }
1379 set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags);
1380 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1381 return 1;
1382}
1383
1384int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
1385{
1386 if (!nfs4_valid_open_stateid(state))
1387 return 0;
1388 set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
1389 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1390 set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags);
1391 set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
1392 return 1;
1393}
1394
1395int nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state)
1396{
1397 struct nfs_client *clp = server->nfs_client;
1398
1399 if (!nfs4_state_mark_reclaim_nograce(clp, state))
1400 return -EBADF;
1401 nfs_inode_find_delegation_state_and_recover(state->inode,
1402 &state->stateid);
1403 dprintk("%s: scheduling stateid recovery for server %s\n", __func__,
1404 clp->cl_hostname);
1405 nfs4_schedule_state_manager(clp);
1406 return 0;
1407}
1408EXPORT_SYMBOL_GPL(nfs4_schedule_stateid_recovery);
1409
1410static struct nfs4_lock_state *
1411nfs_state_find_lock_state_by_stateid(struct nfs4_state *state,
1412 const nfs4_stateid *stateid)
1413{
1414 struct nfs4_lock_state *pos;
1415
1416 list_for_each_entry(pos, &state->lock_states, ls_locks) {
1417 if (!test_bit(NFS_LOCK_INITIALIZED, &pos->ls_flags))
1418 continue;
1419 if (nfs4_stateid_match_or_older(&pos->ls_stateid, stateid))
1420 return pos;
1421 }
1422 return NULL;
1423}
1424
1425static bool nfs_state_lock_state_matches_stateid(struct nfs4_state *state,
1426 const nfs4_stateid *stateid)
1427{
1428 bool found = false;
1429
1430 if (test_bit(LK_STATE_IN_USE, &state->flags)) {
1431 spin_lock(&state->state_lock);
1432 if (nfs_state_find_lock_state_by_stateid(state, stateid))
1433 found = true;
1434 spin_unlock(&state->state_lock);
1435 }
1436 return found;
1437}
1438
1439void nfs_inode_find_state_and_recover(struct inode *inode,
1440 const nfs4_stateid *stateid)
1441{
1442 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
1443 struct nfs_inode *nfsi = NFS_I(inode);
1444 struct nfs_open_context *ctx;
1445 struct nfs4_state *state;
1446 bool found = false;
1447
1448 rcu_read_lock();
1449 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
1450 state = ctx->state;
1451 if (state == NULL)
1452 continue;
1453 if (nfs4_stateid_match_or_older(&state->stateid, stateid) &&
1454 nfs4_state_mark_reclaim_nograce(clp, state)) {
1455 found = true;
1456 continue;
1457 }
1458 if (test_bit(NFS_OPEN_STATE, &state->flags) &&
1459 nfs4_stateid_match_or_older(&state->open_stateid, stateid) &&
1460 nfs4_state_mark_reclaim_nograce(clp, state)) {
1461 found = true;
1462 continue;
1463 }
1464 if (nfs_state_lock_state_matches_stateid(state, stateid) &&
1465 nfs4_state_mark_reclaim_nograce(clp, state))
1466 found = true;
1467 }
1468 rcu_read_unlock();
1469
1470 nfs_inode_find_delegation_state_and_recover(inode, stateid);
1471 if (found)
1472 nfs4_schedule_state_manager(clp);
1473}
1474
1475static void nfs4_state_mark_open_context_bad(struct nfs4_state *state, int err)
1476{
1477 struct inode *inode = state->inode;
1478 struct nfs_inode *nfsi = NFS_I(inode);
1479 struct nfs_open_context *ctx;
1480
1481 rcu_read_lock();
1482 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
1483 if (ctx->state != state)
1484 continue;
1485 set_bit(NFS_CONTEXT_BAD, &ctx->flags);
1486 pr_warn("NFSv4: state recovery failed for open file %pd2, "
1487 "error = %d\n", ctx->dentry, err);
1488 }
1489 rcu_read_unlock();
1490}
1491
1492static void nfs4_state_mark_recovery_failed(struct nfs4_state *state, int error)
1493{
1494 set_bit(NFS_STATE_RECOVERY_FAILED, &state->flags);
1495 nfs4_state_mark_open_context_bad(state, error);
1496}
1497
1498
1499static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
1500{
1501 struct inode *inode = state->inode;
1502 struct nfs_inode *nfsi = NFS_I(inode);
1503 struct file_lock *fl;
1504 struct nfs4_lock_state *lsp;
1505 int status = 0;
1506 struct file_lock_context *flctx = locks_inode_context(inode);
1507 struct list_head *list;
1508
1509 if (flctx == NULL)
1510 return 0;
1511
1512 list = &flctx->flc_posix;
1513
1514 /* Guard against delegation returns and new lock/unlock calls */
1515 down_write(&nfsi->rwsem);
1516 spin_lock(&flctx->flc_lock);
1517restart:
1518 for_each_file_lock(fl, list) {
1519 if (nfs_file_open_context(fl->c.flc_file)->state != state)
1520 continue;
1521 spin_unlock(&flctx->flc_lock);
1522 status = ops->recover_lock(state, fl);
1523 switch (status) {
1524 case 0:
1525 break;
1526 case -ETIMEDOUT:
1527 case -ESTALE:
1528 case -NFS4ERR_ADMIN_REVOKED:
1529 case -NFS4ERR_STALE_STATEID:
1530 case -NFS4ERR_BAD_STATEID:
1531 case -NFS4ERR_EXPIRED:
1532 case -NFS4ERR_NO_GRACE:
1533 case -NFS4ERR_STALE_CLIENTID:
1534 case -NFS4ERR_BADSESSION:
1535 case -NFS4ERR_BADSLOT:
1536 case -NFS4ERR_BAD_HIGH_SLOT:
1537 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1538 goto out;
1539 default:
1540 pr_err("NFS: %s: unhandled error %d\n",
1541 __func__, status);
1542 fallthrough;
1543 case -ENOMEM:
1544 case -NFS4ERR_DENIED:
1545 case -NFS4ERR_RECLAIM_BAD:
1546 case -NFS4ERR_RECLAIM_CONFLICT:
1547 lsp = fl->fl_u.nfs4_fl.owner;
1548 if (lsp)
1549 set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
1550 status = 0;
1551 }
1552 spin_lock(&flctx->flc_lock);
1553 }
1554 if (list == &flctx->flc_posix) {
1555 list = &flctx->flc_flock;
1556 goto restart;
1557 }
1558 spin_unlock(&flctx->flc_lock);
1559out:
1560 up_write(&nfsi->rwsem);
1561 return status;
1562}
1563
1564#ifdef CONFIG_NFS_V4_2
1565static void nfs42_complete_copies(struct nfs4_state_owner *sp, struct nfs4_state *state)
1566{
1567 struct nfs4_copy_state *copy;
1568
1569 if (!test_bit(NFS_CLNT_DST_SSC_COPY_STATE, &state->flags) &&
1570 !test_bit(NFS_CLNT_SRC_SSC_COPY_STATE, &state->flags))
1571 return;
1572
1573 spin_lock(&sp->so_server->nfs_client->cl_lock);
1574 list_for_each_entry(copy, &sp->so_server->ss_copies, copies) {
1575 if ((test_bit(NFS_CLNT_DST_SSC_COPY_STATE, &state->flags) &&
1576 !nfs4_stateid_match_other(&state->stateid,
1577 ©->parent_dst_state->stateid)))
1578 continue;
1579 copy->flags = 1;
1580 if (test_and_clear_bit(NFS_CLNT_DST_SSC_COPY_STATE,
1581 &state->flags)) {
1582 clear_bit(NFS_CLNT_SRC_SSC_COPY_STATE, &state->flags);
1583 complete(©->completion);
1584 }
1585 }
1586 list_for_each_entry(copy, &sp->so_server->ss_src_copies, src_copies) {
1587 if ((test_bit(NFS_CLNT_SRC_SSC_COPY_STATE, &state->flags) &&
1588 !nfs4_stateid_match_other(&state->stateid,
1589 ©->parent_src_state->stateid)))
1590 continue;
1591 copy->flags = 1;
1592 if (test_and_clear_bit(NFS_CLNT_DST_SSC_COPY_STATE,
1593 &state->flags))
1594 complete(©->completion);
1595 }
1596 spin_unlock(&sp->so_server->nfs_client->cl_lock);
1597}
1598#else /* !CONFIG_NFS_V4_2 */
1599static inline void nfs42_complete_copies(struct nfs4_state_owner *sp,
1600 struct nfs4_state *state)
1601{
1602}
1603#endif /* CONFIG_NFS_V4_2 */
1604
1605static int __nfs4_reclaim_open_state(struct nfs4_state_owner *sp, struct nfs4_state *state,
1606 const struct nfs4_state_recovery_ops *ops,
1607 int *lost_locks)
1608{
1609 struct nfs4_lock_state *lock;
1610 int status;
1611
1612 status = ops->recover_open(sp, state);
1613 if (status < 0)
1614 return status;
1615
1616 status = nfs4_reclaim_locks(state, ops);
1617 if (status < 0)
1618 return status;
1619
1620 if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) {
1621 spin_lock(&state->state_lock);
1622 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1623 trace_nfs4_state_lock_reclaim(state, lock);
1624 if (!test_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags) &&
1625 !test_bit(NFS_LOCK_UNLOCKING, &lock->ls_flags))
1626 *lost_locks += 1;
1627 }
1628 spin_unlock(&state->state_lock);
1629 }
1630
1631 nfs42_complete_copies(sp, state);
1632 clear_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
1633 return status;
1634}
1635
1636static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp,
1637 const struct nfs4_state_recovery_ops *ops,
1638 int *lost_locks)
1639{
1640 struct nfs4_state *state;
1641 unsigned int loop = 0;
1642 int status = 0;
1643#ifdef CONFIG_NFS_V4_2
1644 bool found_ssc_copy_state = false;
1645#endif /* CONFIG_NFS_V4_2 */
1646
1647 /* Note: we rely on the sp->so_states list being ordered
1648 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
1649 * states first.
1650 * This is needed to ensure that the server won't give us any
1651 * read delegations that we have to return if, say, we are
1652 * recovering after a network partition or a reboot from a
1653 * server that doesn't support a grace period.
1654 */
1655 spin_lock(&sp->so_lock);
1656restart:
1657 list_for_each_entry(state, &sp->so_states, open_states) {
1658 if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
1659 continue;
1660 if (!nfs4_valid_open_stateid(state))
1661 continue;
1662 if (state->state == 0)
1663 continue;
1664#ifdef CONFIG_NFS_V4_2
1665 if (test_bit(NFS_SRV_SSC_COPY_STATE, &state->flags)) {
1666 nfs4_state_mark_recovery_failed(state, -EIO);
1667 found_ssc_copy_state = true;
1668 continue;
1669 }
1670#endif /* CONFIG_NFS_V4_2 */
1671 refcount_inc(&state->count);
1672 spin_unlock(&sp->so_lock);
1673 status = __nfs4_reclaim_open_state(sp, state, ops, lost_locks);
1674
1675 switch (status) {
1676 default:
1677 if (status >= 0) {
1678 loop = 0;
1679 break;
1680 }
1681 printk(KERN_ERR "NFS: %s: unhandled error %d\n", __func__, status);
1682 fallthrough;
1683 case -ENOENT:
1684 case -ENOMEM:
1685 case -EACCES:
1686 case -EROFS:
1687 case -EIO:
1688 case -ESTALE:
1689 /* Open state on this file cannot be recovered */
1690 nfs4_state_mark_recovery_failed(state, status);
1691 break;
1692 case -EAGAIN:
1693 ssleep(1);
1694 if (loop++ < 10) {
1695 set_bit(ops->state_flag_bit, &state->flags);
1696 break;
1697 }
1698 fallthrough;
1699 case -NFS4ERR_ADMIN_REVOKED:
1700 case -NFS4ERR_STALE_STATEID:
1701 case -NFS4ERR_OLD_STATEID:
1702 case -NFS4ERR_BAD_STATEID:
1703 case -NFS4ERR_RECLAIM_BAD:
1704 case -NFS4ERR_RECLAIM_CONFLICT:
1705 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1706 break;
1707 case -NFS4ERR_EXPIRED:
1708 case -NFS4ERR_NO_GRACE:
1709 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1710 fallthrough;
1711 case -NFS4ERR_STALE_CLIENTID:
1712 case -NFS4ERR_BADSESSION:
1713 case -NFS4ERR_BADSLOT:
1714 case -NFS4ERR_BAD_HIGH_SLOT:
1715 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1716 case -ETIMEDOUT:
1717 goto out_err;
1718 }
1719 nfs4_put_open_state(state);
1720 spin_lock(&sp->so_lock);
1721 goto restart;
1722 }
1723 spin_unlock(&sp->so_lock);
1724#ifdef CONFIG_NFS_V4_2
1725 if (found_ssc_copy_state)
1726 return -EIO;
1727#endif /* CONFIG_NFS_V4_2 */
1728 return 0;
1729out_err:
1730 nfs4_put_open_state(state);
1731 spin_lock(&sp->so_lock);
1732 spin_unlock(&sp->so_lock);
1733 return status;
1734}
1735
1736static void nfs4_clear_open_state(struct nfs4_state *state)
1737{
1738 struct nfs4_lock_state *lock;
1739
1740 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1741 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1742 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1743 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1744 spin_lock(&state->state_lock);
1745 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1746 lock->ls_seqid.flags = 0;
1747 clear_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags);
1748 }
1749 spin_unlock(&state->state_lock);
1750}
1751
1752static void nfs4_reset_seqids(struct nfs_server *server,
1753 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1754{
1755 struct nfs_client *clp = server->nfs_client;
1756 struct nfs4_state_owner *sp;
1757 struct rb_node *pos;
1758 struct nfs4_state *state;
1759
1760 spin_lock(&clp->cl_lock);
1761 for (pos = rb_first(&server->state_owners);
1762 pos != NULL;
1763 pos = rb_next(pos)) {
1764 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1765 sp->so_seqid.flags = 0;
1766 spin_lock(&sp->so_lock);
1767 list_for_each_entry(state, &sp->so_states, open_states) {
1768 if (mark_reclaim(clp, state))
1769 nfs4_clear_open_state(state);
1770 }
1771 spin_unlock(&sp->so_lock);
1772 }
1773 spin_unlock(&clp->cl_lock);
1774}
1775
1776static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp,
1777 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1778{
1779 struct nfs_server *server;
1780
1781 rcu_read_lock();
1782 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1783 nfs4_reset_seqids(server, mark_reclaim);
1784 rcu_read_unlock();
1785}
1786
1787static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
1788{
1789 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1790 /* Mark all delegations for reclaim */
1791 nfs_delegation_mark_reclaim(clp);
1792 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot);
1793}
1794
1795static int nfs4_reclaim_complete(struct nfs_client *clp,
1796 const struct nfs4_state_recovery_ops *ops,
1797 const struct cred *cred)
1798{
1799 /* Notify the server we're done reclaiming our state */
1800 if (ops->reclaim_complete)
1801 return ops->reclaim_complete(clp, cred);
1802 return 0;
1803}
1804
1805static void nfs4_clear_reclaim_server(struct nfs_server *server)
1806{
1807 struct nfs_client *clp = server->nfs_client;
1808 struct nfs4_state_owner *sp;
1809 struct rb_node *pos;
1810 struct nfs4_state *state;
1811
1812 spin_lock(&clp->cl_lock);
1813 for (pos = rb_first(&server->state_owners);
1814 pos != NULL;
1815 pos = rb_next(pos)) {
1816 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1817 spin_lock(&sp->so_lock);
1818 list_for_each_entry(state, &sp->so_states, open_states) {
1819 if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT,
1820 &state->flags))
1821 continue;
1822 nfs4_state_mark_reclaim_nograce(clp, state);
1823 }
1824 spin_unlock(&sp->so_lock);
1825 }
1826 spin_unlock(&clp->cl_lock);
1827}
1828
1829static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp)
1830{
1831 struct nfs_server *server;
1832
1833 if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1834 return 0;
1835
1836 rcu_read_lock();
1837 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1838 nfs4_clear_reclaim_server(server);
1839 rcu_read_unlock();
1840
1841 nfs_delegation_reap_unclaimed(clp);
1842 return 1;
1843}
1844
1845static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
1846{
1847 const struct nfs4_state_recovery_ops *ops;
1848 const struct cred *cred;
1849 int err;
1850
1851 if (!nfs4_state_clear_reclaim_reboot(clp))
1852 return;
1853 pnfs_destroy_all_layouts(clp);
1854 ops = clp->cl_mvops->reboot_recovery_ops;
1855 cred = nfs4_get_clid_cred(clp);
1856 err = nfs4_reclaim_complete(clp, ops, cred);
1857 put_cred(cred);
1858 if (err == -NFS4ERR_CONN_NOT_BOUND_TO_SESSION)
1859 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1860}
1861
1862static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
1863{
1864 nfs_mark_test_expired_all_delegations(clp);
1865 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
1866}
1867
1868static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
1869{
1870 switch (error) {
1871 case 0:
1872 break;
1873 case -NFS4ERR_CB_PATH_DOWN:
1874 nfs40_handle_cb_pathdown(clp);
1875 break;
1876 case -NFS4ERR_NO_GRACE:
1877 nfs4_state_end_reclaim_reboot(clp);
1878 break;
1879 case -NFS4ERR_STALE_CLIENTID:
1880 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1881 nfs4_state_start_reclaim_reboot(clp);
1882 break;
1883 case -NFS4ERR_EXPIRED:
1884 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1885 nfs4_state_start_reclaim_nograce(clp);
1886 break;
1887 case -NFS4ERR_BADSESSION:
1888 case -NFS4ERR_BADSLOT:
1889 case -NFS4ERR_BAD_HIGH_SLOT:
1890 case -NFS4ERR_DEADSESSION:
1891 case -NFS4ERR_SEQ_FALSE_RETRY:
1892 case -NFS4ERR_SEQ_MISORDERED:
1893 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1894 /* Zero session reset errors */
1895 break;
1896 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1897 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
1898 break;
1899 default:
1900 dprintk("%s: failed to handle error %d for server %s\n",
1901 __func__, error, clp->cl_hostname);
1902 return error;
1903 }
1904 dprintk("%s: handled error %d for server %s\n", __func__, error,
1905 clp->cl_hostname);
1906 return 0;
1907}
1908
1909static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
1910{
1911 struct nfs4_state_owner *sp;
1912 struct nfs_server *server;
1913 struct rb_node *pos;
1914 LIST_HEAD(freeme);
1915 int lost_locks = 0;
1916 int status;
1917
1918 status = nfs4_begin_drain_session(clp);
1919 if (status < 0)
1920 return status;
1921restart:
1922 rcu_read_lock();
1923 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
1924 nfs4_purge_state_owners(server, &freeme);
1925 spin_lock(&clp->cl_lock);
1926 for (pos = rb_first(&server->state_owners);
1927 pos != NULL;
1928 pos = rb_next(pos)) {
1929 sp = rb_entry(pos,
1930 struct nfs4_state_owner, so_server_node);
1931 if (!test_and_clear_bit(ops->owner_flag_bit,
1932 &sp->so_flags))
1933 continue;
1934 if (!atomic_inc_not_zero(&sp->so_count))
1935 continue;
1936 spin_unlock(&clp->cl_lock);
1937 rcu_read_unlock();
1938
1939 status = nfs4_reclaim_open_state(sp, ops, &lost_locks);
1940 if (status < 0) {
1941 if (lost_locks)
1942 pr_warn("NFS: %s: lost %d locks\n",
1943 clp->cl_hostname, lost_locks);
1944 set_bit(ops->owner_flag_bit, &sp->so_flags);
1945 nfs4_put_state_owner(sp);
1946 status = nfs4_recovery_handle_error(clp, status);
1947 nfs4_free_state_owners(&freeme);
1948 return (status != 0) ? status : -EAGAIN;
1949 }
1950
1951 nfs4_put_state_owner(sp);
1952 goto restart;
1953 }
1954 spin_unlock(&clp->cl_lock);
1955 }
1956 rcu_read_unlock();
1957 nfs4_free_state_owners(&freeme);
1958 if (lost_locks)
1959 pr_warn("NFS: %s: lost %d locks\n",
1960 clp->cl_hostname, lost_locks);
1961 return 0;
1962}
1963
1964static int nfs4_check_lease(struct nfs_client *clp)
1965{
1966 const struct cred *cred;
1967 const struct nfs4_state_maintenance_ops *ops =
1968 clp->cl_mvops->state_renewal_ops;
1969 int status;
1970
1971 /* Is the client already known to have an expired lease? */
1972 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1973 return 0;
1974 cred = ops->get_state_renewal_cred(clp);
1975 if (cred == NULL) {
1976 cred = nfs4_get_clid_cred(clp);
1977 status = -ENOKEY;
1978 if (cred == NULL)
1979 goto out;
1980 }
1981 status = ops->renew_lease(clp, cred);
1982 put_cred(cred);
1983 if (status == -ETIMEDOUT) {
1984 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1985 return 0;
1986 }
1987out:
1988 return nfs4_recovery_handle_error(clp, status);
1989}
1990
1991/* Set NFS4CLNT_LEASE_EXPIRED and reclaim reboot state for all v4.0 errors
1992 * and for recoverable errors on EXCHANGE_ID for v4.1
1993 */
1994static int nfs4_handle_reclaim_lease_error(struct nfs_client *clp, int status)
1995{
1996 switch (status) {
1997 case -NFS4ERR_SEQ_MISORDERED:
1998 if (test_and_set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state))
1999 return -ESERVERFAULT;
2000 /* Lease confirmation error: retry after purging the lease */
2001 ssleep(1);
2002 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
2003 break;
2004 case -NFS4ERR_STALE_CLIENTID:
2005 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
2006 nfs4_state_start_reclaim_reboot(clp);
2007 break;
2008 case -NFS4ERR_CLID_INUSE:
2009 pr_err("NFS: Server %s reports our clientid is in use\n",
2010 clp->cl_hostname);
2011 nfs_mark_client_ready(clp, -EPERM);
2012 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
2013 return -EPERM;
2014 case -ETIMEDOUT:
2015 if (clp->cl_cons_state == NFS_CS_SESSION_INITING) {
2016 nfs_mark_client_ready(clp, -EIO);
2017 return -EIO;
2018 }
2019 fallthrough;
2020 case -EACCES:
2021 case -NFS4ERR_DELAY:
2022 case -EAGAIN:
2023 ssleep(1);
2024 break;
2025
2026 case -NFS4ERR_MINOR_VERS_MISMATCH:
2027 if (clp->cl_cons_state == NFS_CS_SESSION_INITING)
2028 nfs_mark_client_ready(clp, -EPROTONOSUPPORT);
2029 dprintk("%s: exit with error %d for server %s\n",
2030 __func__, -EPROTONOSUPPORT, clp->cl_hostname);
2031 return -EPROTONOSUPPORT;
2032 case -ENOSPC:
2033 if (clp->cl_cons_state == NFS_CS_SESSION_INITING)
2034 nfs_mark_client_ready(clp, -EIO);
2035 return -EIO;
2036 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
2037 * in nfs4_exchange_id */
2038 default:
2039 dprintk("%s: exit with error %d for server %s\n", __func__,
2040 status, clp->cl_hostname);
2041 return status;
2042 }
2043 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2044 dprintk("%s: handled error %d for server %s\n", __func__, status,
2045 clp->cl_hostname);
2046 return 0;
2047}
2048
2049static int nfs4_establish_lease(struct nfs_client *clp)
2050{
2051 const struct cred *cred;
2052 const struct nfs4_state_recovery_ops *ops =
2053 clp->cl_mvops->reboot_recovery_ops;
2054 int status;
2055
2056 status = nfs4_begin_drain_session(clp);
2057 if (status != 0)
2058 return status;
2059 cred = nfs4_get_clid_cred(clp);
2060 if (cred == NULL)
2061 return -ENOENT;
2062 status = ops->establish_clid(clp, cred);
2063 put_cred(cred);
2064 if (status != 0)
2065 return status;
2066 return 0;
2067}
2068
2069/*
2070 * Returns zero or a negative errno. NFS4ERR values are converted
2071 * to local errno values.
2072 */
2073static int nfs4_reclaim_lease(struct nfs_client *clp)
2074{
2075 int status;
2076
2077 status = nfs4_establish_lease(clp);
2078 if (status < 0)
2079 return nfs4_handle_reclaim_lease_error(clp, status);
2080 if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state))
2081 nfs4_state_start_reclaim_nograce(clp);
2082 if (!test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
2083 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
2084 clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
2085 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2086 return 0;
2087}
2088
2089static int nfs4_purge_lease(struct nfs_client *clp)
2090{
2091 int status;
2092
2093 status = nfs4_establish_lease(clp);
2094 if (status < 0)
2095 return nfs4_handle_reclaim_lease_error(clp, status);
2096 clear_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
2097 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2098 nfs4_state_start_reclaim_nograce(clp);
2099 return 0;
2100}
2101
2102/*
2103 * Try remote migration of one FSID from a source server to a
2104 * destination server. The source server provides a list of
2105 * potential destinations.
2106 *
2107 * Returns zero or a negative NFS4ERR status code.
2108 */
2109static int nfs4_try_migration(struct nfs_server *server, const struct cred *cred)
2110{
2111 struct nfs_client *clp = server->nfs_client;
2112 struct nfs4_fs_locations *locations = NULL;
2113 struct nfs_fattr *fattr;
2114 struct inode *inode;
2115 struct page *page;
2116 int status, result;
2117
2118 dprintk("--> %s: FSID %llx:%llx on \"%s\"\n", __func__,
2119 (unsigned long long)server->fsid.major,
2120 (unsigned long long)server->fsid.minor,
2121 clp->cl_hostname);
2122
2123 page = alloc_page(GFP_KERNEL);
2124 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2125 fattr = nfs_alloc_fattr();
2126 if (page == NULL || locations == NULL || fattr == NULL) {
2127 dprintk("<-- %s: no memory\n", __func__);
2128 result = 0;
2129 goto out;
2130 }
2131
2132 locations->fattr = fattr;
2133 inode = d_inode(server->super->s_root);
2134 result = nfs4_proc_get_locations(server, NFS_FH(inode), locations,
2135 page, cred);
2136 if (result) {
2137 dprintk("<-- %s: failed to retrieve fs_locations: %d\n",
2138 __func__, result);
2139 goto out;
2140 }
2141
2142 result = -NFS4ERR_NXIO;
2143 if (!locations->nlocations)
2144 goto out;
2145
2146 if (!(locations->fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)) {
2147 dprintk("<-- %s: No fs_locations data, migration skipped\n",
2148 __func__);
2149 goto out;
2150 }
2151
2152 status = nfs4_begin_drain_session(clp);
2153 if (status != 0) {
2154 result = status;
2155 goto out;
2156 }
2157
2158 status = nfs4_replace_transport(server, locations);
2159 if (status != 0) {
2160 dprintk("<-- %s: failed to replace transport: %d\n",
2161 __func__, status);
2162 goto out;
2163 }
2164
2165 result = 0;
2166 dprintk("<-- %s: migration succeeded\n", __func__);
2167
2168out:
2169 if (page != NULL)
2170 __free_page(page);
2171 if (locations != NULL)
2172 kfree(locations->fattr);
2173 kfree(locations);
2174 if (result) {
2175 pr_err("NFS: migration recovery failed (server %s)\n",
2176 clp->cl_hostname);
2177 set_bit(NFS_MIG_FAILED, &server->mig_status);
2178 }
2179 return result;
2180}
2181
2182/*
2183 * Returns zero or a negative NFS4ERR status code.
2184 */
2185static int nfs4_handle_migration(struct nfs_client *clp)
2186{
2187 const struct nfs4_state_maintenance_ops *ops =
2188 clp->cl_mvops->state_renewal_ops;
2189 struct nfs_server *server;
2190 const struct cred *cred;
2191
2192 dprintk("%s: migration reported on \"%s\"\n", __func__,
2193 clp->cl_hostname);
2194
2195 cred = ops->get_state_renewal_cred(clp);
2196 if (cred == NULL)
2197 return -NFS4ERR_NOENT;
2198
2199 clp->cl_mig_gen++;
2200restart:
2201 rcu_read_lock();
2202 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
2203 int status;
2204
2205 if (server->mig_gen == clp->cl_mig_gen)
2206 continue;
2207 server->mig_gen = clp->cl_mig_gen;
2208
2209 if (!test_and_clear_bit(NFS_MIG_IN_TRANSITION,
2210 &server->mig_status))
2211 continue;
2212
2213 rcu_read_unlock();
2214 status = nfs4_try_migration(server, cred);
2215 if (status < 0) {
2216 put_cred(cred);
2217 return status;
2218 }
2219 goto restart;
2220 }
2221 rcu_read_unlock();
2222 put_cred(cred);
2223 return 0;
2224}
2225
2226/*
2227 * Test each nfs_server on the clp's cl_superblocks list to see
2228 * if it's moved to another server. Stop when the server no longer
2229 * returns NFS4ERR_LEASE_MOVED.
2230 */
2231static int nfs4_handle_lease_moved(struct nfs_client *clp)
2232{
2233 const struct nfs4_state_maintenance_ops *ops =
2234 clp->cl_mvops->state_renewal_ops;
2235 struct nfs_server *server;
2236 const struct cred *cred;
2237
2238 dprintk("%s: lease moved reported on \"%s\"\n", __func__,
2239 clp->cl_hostname);
2240
2241 cred = ops->get_state_renewal_cred(clp);
2242 if (cred == NULL)
2243 return -NFS4ERR_NOENT;
2244
2245 clp->cl_mig_gen++;
2246restart:
2247 rcu_read_lock();
2248 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
2249 struct inode *inode;
2250 int status;
2251
2252 if (server->mig_gen == clp->cl_mig_gen)
2253 continue;
2254 server->mig_gen = clp->cl_mig_gen;
2255
2256 rcu_read_unlock();
2257
2258 inode = d_inode(server->super->s_root);
2259 status = nfs4_proc_fsid_present(inode, cred);
2260 if (status != -NFS4ERR_MOVED)
2261 goto restart; /* wasn't this one */
2262 if (nfs4_try_migration(server, cred) == -NFS4ERR_LEASE_MOVED)
2263 goto restart; /* there are more */
2264 goto out;
2265 }
2266 rcu_read_unlock();
2267
2268out:
2269 put_cred(cred);
2270 return 0;
2271}
2272
2273/**
2274 * nfs4_discover_server_trunking - Detect server IP address trunking
2275 *
2276 * @clp: nfs_client under test
2277 * @result: OUT: found nfs_client, or clp
2278 *
2279 * Returns zero or a negative errno. If zero is returned,
2280 * an nfs_client pointer is planted in "result".
2281 *
2282 * Note: since we are invoked in process context, and
2283 * not from inside the state manager, we cannot use
2284 * nfs4_handle_reclaim_lease_error().
2285 */
2286int nfs4_discover_server_trunking(struct nfs_client *clp,
2287 struct nfs_client **result)
2288{
2289 const struct nfs4_state_recovery_ops *ops =
2290 clp->cl_mvops->reboot_recovery_ops;
2291 struct rpc_clnt *clnt;
2292 const struct cred *cred;
2293 int i, status;
2294
2295 dprintk("NFS: %s: testing '%s'\n", __func__, clp->cl_hostname);
2296
2297 clnt = clp->cl_rpcclient;
2298 i = 0;
2299
2300 mutex_lock(&nfs_clid_init_mutex);
2301again:
2302 status = -ENOENT;
2303 cred = nfs4_get_clid_cred(clp);
2304 if (cred == NULL)
2305 goto out_unlock;
2306
2307 status = ops->detect_trunking(clp, result, cred);
2308 put_cred(cred);
2309 switch (status) {
2310 case 0:
2311 case -EINTR:
2312 case -ERESTARTSYS:
2313 break;
2314 case -ETIMEDOUT:
2315 if (clnt->cl_softrtry)
2316 break;
2317 fallthrough;
2318 case -NFS4ERR_DELAY:
2319 case -EAGAIN:
2320 ssleep(1);
2321 fallthrough;
2322 case -NFS4ERR_STALE_CLIENTID:
2323 dprintk("NFS: %s after status %d, retrying\n",
2324 __func__, status);
2325 goto again;
2326 case -EACCES:
2327 if (i++ == 0) {
2328 nfs4_root_machine_cred(clp);
2329 goto again;
2330 }
2331 if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX)
2332 break;
2333 fallthrough;
2334 case -NFS4ERR_CLID_INUSE:
2335 case -NFS4ERR_WRONGSEC:
2336 /* No point in retrying if we already used RPC_AUTH_UNIX */
2337 if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX) {
2338 status = -EPERM;
2339 break;
2340 }
2341 clnt = rpc_clone_client_set_auth(clnt, RPC_AUTH_UNIX);
2342 if (IS_ERR(clnt)) {
2343 status = PTR_ERR(clnt);
2344 break;
2345 }
2346 /* Note: this is safe because we haven't yet marked the
2347 * client as ready, so we are the only user of
2348 * clp->cl_rpcclient
2349 */
2350 clnt = xchg(&clp->cl_rpcclient, clnt);
2351 rpc_shutdown_client(clnt);
2352 clnt = clp->cl_rpcclient;
2353 goto again;
2354
2355 case -NFS4ERR_MINOR_VERS_MISMATCH:
2356 status = -EPROTONOSUPPORT;
2357 break;
2358
2359 case -EKEYEXPIRED:
2360 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
2361 * in nfs4_exchange_id */
2362 status = -EKEYEXPIRED;
2363 break;
2364 default:
2365 pr_warn("NFS: %s unhandled error %d. Exiting with error EIO\n",
2366 __func__, status);
2367 status = -EIO;
2368 }
2369
2370out_unlock:
2371 mutex_unlock(&nfs_clid_init_mutex);
2372 dprintk("NFS: %s: status = %d\n", __func__, status);
2373 return status;
2374}
2375
2376#ifdef CONFIG_NFS_V4_1
2377void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
2378{
2379 struct nfs_client *clp = session->clp;
2380
2381 switch (err) {
2382 default:
2383 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2384 break;
2385 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
2386 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2387 }
2388 nfs4_schedule_state_manager(clp);
2389}
2390EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery);
2391
2392void nfs41_notify_server(struct nfs_client *clp)
2393{
2394 /* Use CHECK_LEASE to ping the server with a SEQUENCE */
2395 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
2396 nfs4_schedule_state_manager(clp);
2397}
2398
2399static void nfs4_reset_all_state(struct nfs_client *clp)
2400{
2401 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
2402 set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
2403 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
2404 nfs4_state_start_reclaim_nograce(clp);
2405 dprintk("%s: scheduling reset of all state for server %s!\n",
2406 __func__, clp->cl_hostname);
2407 nfs4_schedule_state_manager(clp);
2408 }
2409}
2410
2411static void nfs41_handle_server_reboot(struct nfs_client *clp)
2412{
2413 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
2414 nfs4_state_start_reclaim_reboot(clp);
2415 dprintk("%s: server %s rebooted!\n", __func__,
2416 clp->cl_hostname);
2417 nfs4_schedule_state_manager(clp);
2418 }
2419}
2420
2421static void nfs41_handle_all_state_revoked(struct nfs_client *clp)
2422{
2423 nfs4_reset_all_state(clp);
2424 dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
2425}
2426
2427static void nfs41_handle_some_state_revoked(struct nfs_client *clp)
2428{
2429 nfs4_state_start_reclaim_nograce(clp);
2430 nfs4_schedule_state_manager(clp);
2431
2432 dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
2433}
2434
2435static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp)
2436{
2437 /* FIXME: For now, we destroy all layouts. */
2438 pnfs_destroy_all_layouts(clp);
2439 nfs_test_expired_all_delegations(clp);
2440 dprintk("%s: Recallable state revoked on server %s!\n", __func__,
2441 clp->cl_hostname);
2442}
2443
2444static void nfs41_handle_backchannel_fault(struct nfs_client *clp)
2445{
2446 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2447 nfs4_schedule_state_manager(clp);
2448
2449 dprintk("%s: server %s declared a backchannel fault\n", __func__,
2450 clp->cl_hostname);
2451}
2452
2453static void nfs41_handle_cb_path_down(struct nfs_client *clp)
2454{
2455 if (test_and_set_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
2456 &clp->cl_state) == 0)
2457 nfs4_schedule_state_manager(clp);
2458}
2459
2460void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags,
2461 bool recovery)
2462{
2463 if (!flags)
2464 return;
2465
2466 dprintk("%s: \"%s\" (client ID %llx) flags=0x%08x\n",
2467 __func__, clp->cl_hostname, clp->cl_clientid, flags);
2468 /*
2469 * If we're called from the state manager thread, then assume we're
2470 * already handling the RECLAIM_NEEDED and/or STATE_REVOKED.
2471 * Those flags are expected to remain set until we're done
2472 * recovering (see RFC5661, section 18.46.3).
2473 */
2474 if (recovery)
2475 goto out_recovery;
2476
2477 if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED)
2478 nfs41_handle_server_reboot(clp);
2479 if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED))
2480 nfs41_handle_all_state_revoked(clp);
2481 if (flags & (SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED |
2482 SEQ4_STATUS_ADMIN_STATE_REVOKED))
2483 nfs41_handle_some_state_revoked(clp);
2484 if (flags & SEQ4_STATUS_LEASE_MOVED)
2485 nfs4_schedule_lease_moved_recovery(clp);
2486 if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED)
2487 nfs41_handle_recallable_state_revoked(clp);
2488out_recovery:
2489 if (flags & SEQ4_STATUS_BACKCHANNEL_FAULT)
2490 nfs41_handle_backchannel_fault(clp);
2491 else if (flags & (SEQ4_STATUS_CB_PATH_DOWN |
2492 SEQ4_STATUS_CB_PATH_DOWN_SESSION))
2493 nfs41_handle_cb_path_down(clp);
2494}
2495
2496static int nfs4_reset_session(struct nfs_client *clp)
2497{
2498 const struct cred *cred;
2499 int status;
2500
2501 if (!nfs4_has_session(clp))
2502 return 0;
2503 status = nfs4_begin_drain_session(clp);
2504 if (status != 0)
2505 return status;
2506 cred = nfs4_get_clid_cred(clp);
2507 status = nfs4_proc_destroy_session(clp->cl_session, cred);
2508 switch (status) {
2509 case 0:
2510 case -NFS4ERR_BADSESSION:
2511 case -NFS4ERR_DEADSESSION:
2512 break;
2513 case -NFS4ERR_BACK_CHAN_BUSY:
2514 case -NFS4ERR_DELAY:
2515 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2516 status = 0;
2517 ssleep(1);
2518 goto out;
2519 default:
2520 status = nfs4_recovery_handle_error(clp, status);
2521 goto out;
2522 }
2523
2524 memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
2525 status = nfs4_proc_create_session(clp, cred);
2526 if (status) {
2527 dprintk("%s: session reset failed with status %d for server %s!\n",
2528 __func__, status, clp->cl_hostname);
2529 status = nfs4_handle_reclaim_lease_error(clp, status);
2530 goto out;
2531 }
2532 nfs41_finish_session_reset(clp);
2533 dprintk("%s: session reset was successful for server %s!\n",
2534 __func__, clp->cl_hostname);
2535out:
2536 put_cred(cred);
2537 return status;
2538}
2539
2540static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2541{
2542 const struct cred *cred;
2543 int ret;
2544
2545 if (!nfs4_has_session(clp))
2546 return 0;
2547 ret = nfs4_begin_drain_session(clp);
2548 if (ret != 0)
2549 return ret;
2550 cred = nfs4_get_clid_cred(clp);
2551 ret = nfs4_proc_bind_conn_to_session(clp, cred);
2552 put_cred(cred);
2553 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2554 switch (ret) {
2555 case 0:
2556 dprintk("%s: bind_conn_to_session was successful for server %s!\n",
2557 __func__, clp->cl_hostname);
2558 break;
2559 case -NFS4ERR_DELAY:
2560 ssleep(1);
2561 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2562 break;
2563 default:
2564 return nfs4_recovery_handle_error(clp, ret);
2565 }
2566 return 0;
2567}
2568
2569static void nfs4_layoutreturn_any_run(struct nfs_client *clp)
2570{
2571 int iomode = 0;
2572
2573 if (test_and_clear_bit(NFS4CLNT_RECALL_ANY_LAYOUT_READ, &clp->cl_state))
2574 iomode += IOMODE_READ;
2575 if (test_and_clear_bit(NFS4CLNT_RECALL_ANY_LAYOUT_RW, &clp->cl_state))
2576 iomode += IOMODE_RW;
2577 /* Note: IOMODE_READ + IOMODE_RW == IOMODE_ANY */
2578 if (iomode) {
2579 pnfs_layout_return_unused_byclid(clp, iomode);
2580 set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
2581 }
2582}
2583#else /* CONFIG_NFS_V4_1 */
2584static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
2585
2586static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2587{
2588 return 0;
2589}
2590
2591static void nfs4_layoutreturn_any_run(struct nfs_client *clp)
2592{
2593}
2594#endif /* CONFIG_NFS_V4_1 */
2595
2596static void nfs4_state_manager(struct nfs_client *clp)
2597{
2598 unsigned int memflags;
2599 int status = 0;
2600 const char *section = "", *section_sep = "";
2601
2602 /*
2603 * State recovery can deadlock if the direct reclaim code tries
2604 * start NFS writeback. So ensure memory allocations are all
2605 * GFP_NOFS.
2606 */
2607 memflags = memalloc_nofs_save();
2608
2609 /* Ensure exclusive access to NFSv4 state */
2610 do {
2611 trace_nfs4_state_mgr(clp);
2612 clear_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
2613 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
2614 section = "purge state";
2615 status = nfs4_purge_lease(clp);
2616 if (status < 0)
2617 goto out_error;
2618 continue;
2619 }
2620
2621 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
2622 section = "lease expired";
2623 /* We're going to have to re-establish a clientid */
2624 status = nfs4_reclaim_lease(clp);
2625 if (status < 0)
2626 goto out_error;
2627 continue;
2628 }
2629
2630 /* Initialize or reset the session */
2631 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) {
2632 section = "reset session";
2633 status = nfs4_reset_session(clp);
2634 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
2635 continue;
2636 if (status < 0)
2637 goto out_error;
2638 }
2639
2640 /* Send BIND_CONN_TO_SESSION */
2641 if (test_and_clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
2642 &clp->cl_state)) {
2643 section = "bind conn to session";
2644 status = nfs4_bind_conn_to_session(clp);
2645 if (status < 0)
2646 goto out_error;
2647 continue;
2648 }
2649
2650 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
2651 section = "check lease";
2652 status = nfs4_check_lease(clp);
2653 if (status < 0)
2654 goto out_error;
2655 continue;
2656 }
2657
2658 if (test_and_clear_bit(NFS4CLNT_MOVED, &clp->cl_state)) {
2659 section = "migration";
2660 status = nfs4_handle_migration(clp);
2661 if (status < 0)
2662 goto out_error;
2663 }
2664
2665 if (test_and_clear_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state)) {
2666 section = "lease moved";
2667 status = nfs4_handle_lease_moved(clp);
2668 if (status < 0)
2669 goto out_error;
2670 }
2671
2672 /* First recover reboot state... */
2673 if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
2674 section = "reclaim reboot";
2675 status = nfs4_do_reclaim(clp,
2676 clp->cl_mvops->reboot_recovery_ops);
2677 if (status == 0)
2678 status = pnfs_layout_handle_reboot(clp);
2679 if (status == -EAGAIN)
2680 continue;
2681 if (status < 0)
2682 goto out_error;
2683 nfs4_state_end_reclaim_reboot(clp);
2684 continue;
2685 }
2686
2687 /* Detect expired delegations... */
2688 if (test_and_clear_bit(NFS4CLNT_DELEGATION_EXPIRED, &clp->cl_state)) {
2689 section = "detect expired delegations";
2690 status = nfs4_begin_drain_session(clp);
2691 if (status < 0)
2692 goto out_error;
2693 nfs_reap_expired_delegations(clp);
2694 continue;
2695 }
2696
2697 /* Now recover expired state... */
2698 if (test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
2699 section = "reclaim nograce";
2700 status = nfs4_do_reclaim(clp,
2701 clp->cl_mvops->nograce_recovery_ops);
2702 if (status == -EAGAIN)
2703 continue;
2704 if (status < 0)
2705 goto out_error;
2706 clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
2707 }
2708
2709 memalloc_nofs_restore(memflags);
2710 nfs4_end_drain_session(clp);
2711 nfs4_clear_state_manager_bit(clp);
2712
2713 if (test_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state) &&
2714 !test_and_set_bit(NFS4CLNT_MANAGER_RUNNING,
2715 &clp->cl_state)) {
2716 memflags = memalloc_nofs_save();
2717 continue;
2718 }
2719
2720 if (!test_and_set_bit(NFS4CLNT_RECALL_RUNNING, &clp->cl_state)) {
2721 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
2722 nfs_client_return_marked_delegations(clp);
2723 set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
2724 }
2725 nfs4_layoutreturn_any_run(clp);
2726 clear_bit(NFS4CLNT_RECALL_RUNNING, &clp->cl_state);
2727 }
2728
2729 return;
2730
2731 } while (refcount_read(&clp->cl_count) > 1 && !signalled());
2732 goto out_drain;
2733
2734out_error:
2735 if (strlen(section))
2736 section_sep = ": ";
2737 trace_nfs4_state_mgr_failed(clp, section, status);
2738 pr_warn_ratelimited("NFS: state manager%s%s failed on NFSv4 server %s"
2739 " with error %d\n", section_sep, section,
2740 clp->cl_hostname, -status);
2741 ssleep(1);
2742out_drain:
2743 memalloc_nofs_restore(memflags);
2744 nfs4_end_drain_session(clp);
2745 nfs4_clear_state_manager_bit(clp);
2746}
2747
2748static int nfs4_run_state_manager(void *ptr)
2749{
2750 struct nfs_client *clp = ptr;
2751 struct rpc_clnt *cl = clp->cl_rpcclient;
2752
2753 while (cl != cl->cl_parent)
2754 cl = cl->cl_parent;
2755
2756 allow_signal(SIGKILL);
2757again:
2758 nfs4_state_manager(clp);
2759
2760 if (test_bit(NFS4CLNT_MANAGER_AVAILABLE, &clp->cl_state) &&
2761 !test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state)) {
2762 wait_var_event_interruptible(&clp->cl_state,
2763 test_bit(NFS4CLNT_RUN_MANAGER,
2764 &clp->cl_state));
2765 if (!atomic_read(&cl->cl_swapper))
2766 clear_bit(NFS4CLNT_MANAGER_AVAILABLE, &clp->cl_state);
2767 if (refcount_read(&clp->cl_count) > 1 && !signalled() &&
2768 !test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state))
2769 goto again;
2770 /* Either no longer a swapper, or were signalled */
2771 clear_bit(NFS4CLNT_MANAGER_AVAILABLE, &clp->cl_state);
2772 }
2773
2774 if (refcount_read(&clp->cl_count) > 1 && !signalled() &&
2775 test_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state) &&
2776 !test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state))
2777 goto again;
2778
2779 nfs_put_client(clp);
2780 module_put_and_kthread_exit(0);
2781 return 0;
2782}
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/kthread.h>
46#include <linux/module.h>
47#include <linux/random.h>
48#include <linux/ratelimit.h>
49#include <linux/workqueue.h>
50#include <linux/bitops.h>
51#include <linux/jiffies.h>
52
53#include <linux/sunrpc/clnt.h>
54
55#include "nfs4_fs.h"
56#include "callback.h"
57#include "delegation.h"
58#include "internal.h"
59#include "nfs4idmap.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 = {
69 { .data = { 0 } },
70 .type = NFS4_SPECIAL_STATEID_TYPE,
71};
72static DEFINE_MUTEX(nfs_clid_init_mutex);
73
74int nfs4_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
75{
76 struct nfs4_setclientid_res clid = {
77 .clientid = clp->cl_clientid,
78 .confirm = clp->cl_confirm,
79 };
80 unsigned short port;
81 int status;
82 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
83
84 if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
85 goto do_confirm;
86 port = nn->nfs_callback_tcpport;
87 if (clp->cl_addr.ss_family == AF_INET6)
88 port = nn->nfs_callback_tcpport6;
89
90 status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
91 if (status != 0)
92 goto out;
93 clp->cl_clientid = clid.clientid;
94 clp->cl_confirm = clid.confirm;
95 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
96do_confirm:
97 status = nfs4_proc_setclientid_confirm(clp, &clid, cred);
98 if (status != 0)
99 goto out;
100 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
101 nfs4_schedule_state_renewal(clp);
102out:
103 return status;
104}
105
106/**
107 * nfs40_discover_server_trunking - Detect server IP address trunking (mv0)
108 *
109 * @clp: nfs_client under test
110 * @result: OUT: found nfs_client, or clp
111 * @cred: credential to use for trunking test
112 *
113 * Returns zero, a negative errno, or a negative NFS4ERR status.
114 * If zero is returned, an nfs_client pointer is planted in
115 * "result".
116 *
117 * Note: The returned client may not yet be marked ready.
118 */
119int nfs40_discover_server_trunking(struct nfs_client *clp,
120 struct nfs_client **result,
121 struct rpc_cred *cred)
122{
123 struct nfs4_setclientid_res clid = {
124 .clientid = clp->cl_clientid,
125 .confirm = clp->cl_confirm,
126 };
127 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
128 unsigned short port;
129 int status;
130
131 port = nn->nfs_callback_tcpport;
132 if (clp->cl_addr.ss_family == AF_INET6)
133 port = nn->nfs_callback_tcpport6;
134
135 status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
136 if (status != 0)
137 goto out;
138 clp->cl_clientid = clid.clientid;
139 clp->cl_confirm = clid.confirm;
140
141 status = nfs40_walk_client_list(clp, result, cred);
142 if (status == 0) {
143 /* Sustain the lease, even if it's empty. If the clientid4
144 * goes stale it's of no use for trunking discovery. */
145 nfs4_schedule_state_renewal(*result);
146 }
147out:
148 return status;
149}
150
151struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp)
152{
153 struct rpc_cred *cred = NULL;
154
155 if (clp->cl_machine_cred != NULL)
156 cred = get_rpccred(clp->cl_machine_cred);
157 return cred;
158}
159
160static void nfs4_root_machine_cred(struct nfs_client *clp)
161{
162 struct rpc_cred *cred, *new;
163
164 new = rpc_lookup_machine_cred(NULL);
165 spin_lock(&clp->cl_lock);
166 cred = clp->cl_machine_cred;
167 clp->cl_machine_cred = new;
168 spin_unlock(&clp->cl_lock);
169 if (cred != NULL)
170 put_rpccred(cred);
171}
172
173static struct rpc_cred *
174nfs4_get_renew_cred_server_locked(struct nfs_server *server)
175{
176 struct rpc_cred *cred = NULL;
177 struct nfs4_state_owner *sp;
178 struct rb_node *pos;
179
180 for (pos = rb_first(&server->state_owners);
181 pos != NULL;
182 pos = rb_next(pos)) {
183 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
184 if (list_empty(&sp->so_states))
185 continue;
186 cred = get_rpccred(sp->so_cred);
187 break;
188 }
189 return cred;
190}
191
192/**
193 * nfs4_get_renew_cred_locked - Acquire credential for a renew operation
194 * @clp: client state handle
195 *
196 * Returns an rpc_cred with reference count bumped, or NULL.
197 * Caller must hold clp->cl_lock.
198 */
199struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp)
200{
201 struct rpc_cred *cred = NULL;
202 struct nfs_server *server;
203
204 /* Use machine credentials if available */
205 cred = nfs4_get_machine_cred_locked(clp);
206 if (cred != NULL)
207 goto out;
208
209 rcu_read_lock();
210 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
211 cred = nfs4_get_renew_cred_server_locked(server);
212 if (cred != NULL)
213 break;
214 }
215 rcu_read_unlock();
216
217out:
218 return cred;
219}
220
221static void nfs4_end_drain_slot_table(struct nfs4_slot_table *tbl)
222{
223 if (test_and_clear_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) {
224 spin_lock(&tbl->slot_tbl_lock);
225 nfs41_wake_slot_table(tbl);
226 spin_unlock(&tbl->slot_tbl_lock);
227 }
228}
229
230static void nfs4_end_drain_session(struct nfs_client *clp)
231{
232 struct nfs4_session *ses = clp->cl_session;
233
234 if (clp->cl_slot_tbl) {
235 nfs4_end_drain_slot_table(clp->cl_slot_tbl);
236 return;
237 }
238
239 if (ses != NULL) {
240 nfs4_end_drain_slot_table(&ses->bc_slot_table);
241 nfs4_end_drain_slot_table(&ses->fc_slot_table);
242 }
243}
244
245static int nfs4_drain_slot_tbl(struct nfs4_slot_table *tbl)
246{
247 set_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state);
248 spin_lock(&tbl->slot_tbl_lock);
249 if (tbl->highest_used_slotid != NFS4_NO_SLOT) {
250 reinit_completion(&tbl->complete);
251 spin_unlock(&tbl->slot_tbl_lock);
252 return wait_for_completion_interruptible(&tbl->complete);
253 }
254 spin_unlock(&tbl->slot_tbl_lock);
255 return 0;
256}
257
258static int nfs4_begin_drain_session(struct nfs_client *clp)
259{
260 struct nfs4_session *ses = clp->cl_session;
261 int ret = 0;
262
263 if (clp->cl_slot_tbl)
264 return nfs4_drain_slot_tbl(clp->cl_slot_tbl);
265
266 /* back channel */
267 ret = nfs4_drain_slot_tbl(&ses->bc_slot_table);
268 if (ret)
269 return ret;
270 /* fore channel */
271 return nfs4_drain_slot_tbl(&ses->fc_slot_table);
272}
273
274#if defined(CONFIG_NFS_V4_1)
275
276static int nfs41_setup_state_renewal(struct nfs_client *clp)
277{
278 int status;
279 struct nfs_fsinfo fsinfo;
280 unsigned long now;
281
282 if (!test_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state)) {
283 nfs4_schedule_state_renewal(clp);
284 return 0;
285 }
286
287 now = jiffies;
288 status = nfs4_proc_get_lease_time(clp, &fsinfo);
289 if (status == 0) {
290 nfs4_set_lease_period(clp, fsinfo.lease_time * HZ, now);
291 nfs4_schedule_state_renewal(clp);
292 }
293
294 return status;
295}
296
297static void nfs41_finish_session_reset(struct nfs_client *clp)
298{
299 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
300 clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
301 /* create_session negotiated new slot table */
302 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
303 nfs41_setup_state_renewal(clp);
304}
305
306int nfs41_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
307{
308 int status;
309
310 if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
311 goto do_confirm;
312 status = nfs4_proc_exchange_id(clp, cred);
313 if (status != 0)
314 goto out;
315 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
316do_confirm:
317 status = nfs4_proc_create_session(clp, cred);
318 if (status != 0)
319 goto out;
320 nfs41_finish_session_reset(clp);
321 nfs_mark_client_ready(clp, NFS_CS_READY);
322out:
323 return status;
324}
325
326/**
327 * nfs41_discover_server_trunking - Detect server IP address trunking (mv1)
328 *
329 * @clp: nfs_client under test
330 * @result: OUT: found nfs_client, or clp
331 * @cred: credential to use for trunking test
332 *
333 * Returns NFS4_OK, a negative errno, or a negative NFS4ERR status.
334 * If NFS4_OK is returned, an nfs_client pointer is planted in
335 * "result".
336 *
337 * Note: The returned client may not yet be marked ready.
338 */
339int nfs41_discover_server_trunking(struct nfs_client *clp,
340 struct nfs_client **result,
341 struct rpc_cred *cred)
342{
343 int status;
344
345 status = nfs4_proc_exchange_id(clp, cred);
346 if (status != NFS4_OK)
347 return status;
348
349 status = nfs41_walk_client_list(clp, result, cred);
350 if (status < 0)
351 return status;
352 if (clp != *result)
353 return 0;
354
355 /* Purge state if the client id was established in a prior instance */
356 if (clp->cl_exchange_flags & EXCHGID4_FLAG_CONFIRMED_R)
357 set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
358 else
359 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
360 nfs4_schedule_state_manager(clp);
361 status = nfs_wait_client_init_complete(clp);
362 if (status < 0)
363 nfs_put_client(clp);
364 return status;
365}
366
367#endif /* CONFIG_NFS_V4_1 */
368
369/**
370 * nfs4_get_clid_cred - Acquire credential for a setclientid operation
371 * @clp: client state handle
372 *
373 * Returns an rpc_cred with reference count bumped, or NULL.
374 */
375struct rpc_cred *nfs4_get_clid_cred(struct nfs_client *clp)
376{
377 struct rpc_cred *cred;
378
379 spin_lock(&clp->cl_lock);
380 cred = nfs4_get_machine_cred_locked(clp);
381 spin_unlock(&clp->cl_lock);
382 return cred;
383}
384
385static struct nfs4_state_owner *
386nfs4_find_state_owner_locked(struct nfs_server *server, struct rpc_cred *cred)
387{
388 struct rb_node **p = &server->state_owners.rb_node,
389 *parent = NULL;
390 struct nfs4_state_owner *sp;
391
392 while (*p != NULL) {
393 parent = *p;
394 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
395
396 if (cred < sp->so_cred)
397 p = &parent->rb_left;
398 else if (cred > sp->so_cred)
399 p = &parent->rb_right;
400 else {
401 if (!list_empty(&sp->so_lru))
402 list_del_init(&sp->so_lru);
403 atomic_inc(&sp->so_count);
404 return sp;
405 }
406 }
407 return NULL;
408}
409
410static struct nfs4_state_owner *
411nfs4_insert_state_owner_locked(struct nfs4_state_owner *new)
412{
413 struct nfs_server *server = new->so_server;
414 struct rb_node **p = &server->state_owners.rb_node,
415 *parent = NULL;
416 struct nfs4_state_owner *sp;
417 int err;
418
419 while (*p != NULL) {
420 parent = *p;
421 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
422
423 if (new->so_cred < sp->so_cred)
424 p = &parent->rb_left;
425 else if (new->so_cred > sp->so_cred)
426 p = &parent->rb_right;
427 else {
428 if (!list_empty(&sp->so_lru))
429 list_del_init(&sp->so_lru);
430 atomic_inc(&sp->so_count);
431 return sp;
432 }
433 }
434 err = ida_get_new(&server->openowner_id, &new->so_seqid.owner_id);
435 if (err)
436 return ERR_PTR(err);
437 rb_link_node(&new->so_server_node, parent, p);
438 rb_insert_color(&new->so_server_node, &server->state_owners);
439 return new;
440}
441
442static void
443nfs4_remove_state_owner_locked(struct nfs4_state_owner *sp)
444{
445 struct nfs_server *server = sp->so_server;
446
447 if (!RB_EMPTY_NODE(&sp->so_server_node))
448 rb_erase(&sp->so_server_node, &server->state_owners);
449 ida_remove(&server->openowner_id, sp->so_seqid.owner_id);
450}
451
452static void
453nfs4_init_seqid_counter(struct nfs_seqid_counter *sc)
454{
455 sc->create_time = ktime_get();
456 sc->flags = 0;
457 sc->counter = 0;
458 spin_lock_init(&sc->lock);
459 INIT_LIST_HEAD(&sc->list);
460 rpc_init_wait_queue(&sc->wait, "Seqid_waitqueue");
461}
462
463static void
464nfs4_destroy_seqid_counter(struct nfs_seqid_counter *sc)
465{
466 rpc_destroy_wait_queue(&sc->wait);
467}
468
469/*
470 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
471 * create a new state_owner.
472 *
473 */
474static struct nfs4_state_owner *
475nfs4_alloc_state_owner(struct nfs_server *server,
476 struct rpc_cred *cred,
477 gfp_t gfp_flags)
478{
479 struct nfs4_state_owner *sp;
480
481 sp = kzalloc(sizeof(*sp), gfp_flags);
482 if (!sp)
483 return NULL;
484 sp->so_server = server;
485 sp->so_cred = get_rpccred(cred);
486 spin_lock_init(&sp->so_lock);
487 INIT_LIST_HEAD(&sp->so_states);
488 nfs4_init_seqid_counter(&sp->so_seqid);
489 atomic_set(&sp->so_count, 1);
490 INIT_LIST_HEAD(&sp->so_lru);
491 seqcount_init(&sp->so_reclaim_seqcount);
492 mutex_init(&sp->so_delegreturn_mutex);
493 return sp;
494}
495
496static void
497nfs4_reset_state_owner(struct nfs4_state_owner *sp)
498{
499 /* This state_owner is no longer usable, but must
500 * remain in place so that state recovery can find it
501 * and the opens associated with it.
502 * It may also be used for new 'open' request to
503 * return a delegation to the server.
504 * So update the 'create_time' so that it looks like
505 * a new state_owner. This will cause the server to
506 * request an OPEN_CONFIRM to start a new sequence.
507 */
508 sp->so_seqid.create_time = ktime_get();
509}
510
511static void nfs4_free_state_owner(struct nfs4_state_owner *sp)
512{
513 nfs4_destroy_seqid_counter(&sp->so_seqid);
514 put_rpccred(sp->so_cred);
515 kfree(sp);
516}
517
518static void nfs4_gc_state_owners(struct nfs_server *server)
519{
520 struct nfs_client *clp = server->nfs_client;
521 struct nfs4_state_owner *sp, *tmp;
522 unsigned long time_min, time_max;
523 LIST_HEAD(doomed);
524
525 spin_lock(&clp->cl_lock);
526 time_max = jiffies;
527 time_min = (long)time_max - (long)clp->cl_lease_time;
528 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
529 /* NB: LRU is sorted so that oldest is at the head */
530 if (time_in_range(sp->so_expires, time_min, time_max))
531 break;
532 list_move(&sp->so_lru, &doomed);
533 nfs4_remove_state_owner_locked(sp);
534 }
535 spin_unlock(&clp->cl_lock);
536
537 list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
538 list_del(&sp->so_lru);
539 nfs4_free_state_owner(sp);
540 }
541}
542
543/**
544 * nfs4_get_state_owner - Look up a state owner given a credential
545 * @server: nfs_server to search
546 * @cred: RPC credential to match
547 *
548 * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL.
549 */
550struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server,
551 struct rpc_cred *cred,
552 gfp_t gfp_flags)
553{
554 struct nfs_client *clp = server->nfs_client;
555 struct nfs4_state_owner *sp, *new;
556
557 spin_lock(&clp->cl_lock);
558 sp = nfs4_find_state_owner_locked(server, cred);
559 spin_unlock(&clp->cl_lock);
560 if (sp != NULL)
561 goto out;
562 new = nfs4_alloc_state_owner(server, cred, gfp_flags);
563 if (new == NULL)
564 goto out;
565 do {
566 if (ida_pre_get(&server->openowner_id, gfp_flags) == 0)
567 break;
568 spin_lock(&clp->cl_lock);
569 sp = nfs4_insert_state_owner_locked(new);
570 spin_unlock(&clp->cl_lock);
571 } while (sp == ERR_PTR(-EAGAIN));
572 if (sp != new)
573 nfs4_free_state_owner(new);
574out:
575 nfs4_gc_state_owners(server);
576 return sp;
577}
578
579/**
580 * nfs4_put_state_owner - Release a nfs4_state_owner
581 * @sp: state owner data to release
582 *
583 * Note that we keep released state owners on an LRU
584 * list.
585 * This caches valid state owners so that they can be
586 * reused, to avoid the OPEN_CONFIRM on minor version 0.
587 * It also pins the uniquifier of dropped state owners for
588 * a while, to ensure that those state owner names are
589 * never reused.
590 */
591void nfs4_put_state_owner(struct nfs4_state_owner *sp)
592{
593 struct nfs_server *server = sp->so_server;
594 struct nfs_client *clp = server->nfs_client;
595
596 if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
597 return;
598
599 sp->so_expires = jiffies;
600 list_add_tail(&sp->so_lru, &server->state_owners_lru);
601 spin_unlock(&clp->cl_lock);
602}
603
604/**
605 * nfs4_purge_state_owners - Release all cached state owners
606 * @server: nfs_server with cached state owners to release
607 *
608 * Called at umount time. Remaining state owners will be on
609 * the LRU with ref count of zero.
610 */
611void nfs4_purge_state_owners(struct nfs_server *server)
612{
613 struct nfs_client *clp = server->nfs_client;
614 struct nfs4_state_owner *sp, *tmp;
615 LIST_HEAD(doomed);
616
617 spin_lock(&clp->cl_lock);
618 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
619 list_move(&sp->so_lru, &doomed);
620 nfs4_remove_state_owner_locked(sp);
621 }
622 spin_unlock(&clp->cl_lock);
623
624 list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
625 list_del(&sp->so_lru);
626 nfs4_free_state_owner(sp);
627 }
628}
629
630static struct nfs4_state *
631nfs4_alloc_open_state(void)
632{
633 struct nfs4_state *state;
634
635 state = kzalloc(sizeof(*state), GFP_NOFS);
636 if (!state)
637 return NULL;
638 atomic_set(&state->count, 1);
639 INIT_LIST_HEAD(&state->lock_states);
640 spin_lock_init(&state->state_lock);
641 seqlock_init(&state->seqlock);
642 return state;
643}
644
645void
646nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode)
647{
648 if (state->state == fmode)
649 return;
650 /* NB! List reordering - see the reclaim code for why. */
651 if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) {
652 if (fmode & FMODE_WRITE)
653 list_move(&state->open_states, &state->owner->so_states);
654 else
655 list_move_tail(&state->open_states, &state->owner->so_states);
656 }
657 state->state = fmode;
658}
659
660static struct nfs4_state *
661__nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner)
662{
663 struct nfs_inode *nfsi = NFS_I(inode);
664 struct nfs4_state *state;
665
666 list_for_each_entry(state, &nfsi->open_states, inode_states) {
667 if (state->owner != owner)
668 continue;
669 if (!nfs4_valid_open_stateid(state))
670 continue;
671 if (atomic_inc_not_zero(&state->count))
672 return state;
673 }
674 return NULL;
675}
676
677static void
678nfs4_free_open_state(struct nfs4_state *state)
679{
680 kfree(state);
681}
682
683struct nfs4_state *
684nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
685{
686 struct nfs4_state *state, *new;
687 struct nfs_inode *nfsi = NFS_I(inode);
688
689 spin_lock(&inode->i_lock);
690 state = __nfs4_find_state_byowner(inode, owner);
691 spin_unlock(&inode->i_lock);
692 if (state)
693 goto out;
694 new = nfs4_alloc_open_state();
695 spin_lock(&owner->so_lock);
696 spin_lock(&inode->i_lock);
697 state = __nfs4_find_state_byowner(inode, owner);
698 if (state == NULL && new != NULL) {
699 state = new;
700 state->owner = owner;
701 atomic_inc(&owner->so_count);
702 list_add(&state->inode_states, &nfsi->open_states);
703 ihold(inode);
704 state->inode = inode;
705 spin_unlock(&inode->i_lock);
706 /* Note: The reclaim code dictates that we add stateless
707 * and read-only stateids to the end of the list */
708 list_add_tail(&state->open_states, &owner->so_states);
709 spin_unlock(&owner->so_lock);
710 } else {
711 spin_unlock(&inode->i_lock);
712 spin_unlock(&owner->so_lock);
713 if (new)
714 nfs4_free_open_state(new);
715 }
716out:
717 return state;
718}
719
720void nfs4_put_open_state(struct nfs4_state *state)
721{
722 struct inode *inode = state->inode;
723 struct nfs4_state_owner *owner = state->owner;
724
725 if (!atomic_dec_and_lock(&state->count, &owner->so_lock))
726 return;
727 spin_lock(&inode->i_lock);
728 list_del(&state->inode_states);
729 list_del(&state->open_states);
730 spin_unlock(&inode->i_lock);
731 spin_unlock(&owner->so_lock);
732 iput(inode);
733 nfs4_free_open_state(state);
734 nfs4_put_state_owner(owner);
735}
736
737/*
738 * Close the current file.
739 */
740static void __nfs4_close(struct nfs4_state *state,
741 fmode_t fmode, gfp_t gfp_mask, int wait)
742{
743 struct nfs4_state_owner *owner = state->owner;
744 int call_close = 0;
745 fmode_t newstate;
746
747 atomic_inc(&owner->so_count);
748 /* Protect against nfs4_find_state() */
749 spin_lock(&owner->so_lock);
750 switch (fmode & (FMODE_READ | FMODE_WRITE)) {
751 case FMODE_READ:
752 state->n_rdonly--;
753 break;
754 case FMODE_WRITE:
755 state->n_wronly--;
756 break;
757 case FMODE_READ|FMODE_WRITE:
758 state->n_rdwr--;
759 }
760 newstate = FMODE_READ|FMODE_WRITE;
761 if (state->n_rdwr == 0) {
762 if (state->n_rdonly == 0) {
763 newstate &= ~FMODE_READ;
764 call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
765 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
766 }
767 if (state->n_wronly == 0) {
768 newstate &= ~FMODE_WRITE;
769 call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
770 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
771 }
772 if (newstate == 0)
773 clear_bit(NFS_DELEGATED_STATE, &state->flags);
774 }
775 nfs4_state_set_mode_locked(state, newstate);
776 spin_unlock(&owner->so_lock);
777
778 if (!call_close) {
779 nfs4_put_open_state(state);
780 nfs4_put_state_owner(owner);
781 } else
782 nfs4_do_close(state, gfp_mask, wait);
783}
784
785void nfs4_close_state(struct nfs4_state *state, fmode_t fmode)
786{
787 __nfs4_close(state, fmode, GFP_NOFS, 0);
788}
789
790void nfs4_close_sync(struct nfs4_state *state, fmode_t fmode)
791{
792 __nfs4_close(state, fmode, GFP_KERNEL, 1);
793}
794
795/*
796 * Search the state->lock_states for an existing lock_owner
797 * that is compatible with either of the given owners.
798 * If the second is non-zero, then the first refers to a Posix-lock
799 * owner (current->files) and the second refers to a flock/OFD
800 * owner (struct file*). In that case, prefer a match for the first
801 * owner.
802 * If both sorts of locks are held on the one file we cannot know
803 * which stateid was intended to be used, so a "correct" choice cannot
804 * be made. Failing that, a "consistent" choice is preferable. The
805 * consistent choice we make is to prefer the first owner, that of a
806 * Posix lock.
807 */
808static struct nfs4_lock_state *
809__nfs4_find_lock_state(struct nfs4_state *state,
810 fl_owner_t fl_owner, fl_owner_t fl_owner2)
811{
812 struct nfs4_lock_state *pos, *ret = NULL;
813 list_for_each_entry(pos, &state->lock_states, ls_locks) {
814 if (pos->ls_owner == fl_owner) {
815 ret = pos;
816 break;
817 }
818 if (pos->ls_owner == fl_owner2)
819 ret = pos;
820 }
821 if (ret)
822 atomic_inc(&ret->ls_count);
823 return ret;
824}
825
826/*
827 * Return a compatible lock_state. If no initialized lock_state structure
828 * exists, return an uninitialized one.
829 *
830 */
831static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
832{
833 struct nfs4_lock_state *lsp;
834 struct nfs_server *server = state->owner->so_server;
835
836 lsp = kzalloc(sizeof(*lsp), GFP_NOFS);
837 if (lsp == NULL)
838 return NULL;
839 nfs4_init_seqid_counter(&lsp->ls_seqid);
840 atomic_set(&lsp->ls_count, 1);
841 lsp->ls_state = state;
842 lsp->ls_owner = fl_owner;
843 lsp->ls_seqid.owner_id = ida_simple_get(&server->lockowner_id, 0, 0, GFP_NOFS);
844 if (lsp->ls_seqid.owner_id < 0)
845 goto out_free;
846 INIT_LIST_HEAD(&lsp->ls_locks);
847 return lsp;
848out_free:
849 kfree(lsp);
850 return NULL;
851}
852
853void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
854{
855 ida_simple_remove(&server->lockowner_id, lsp->ls_seqid.owner_id);
856 nfs4_destroy_seqid_counter(&lsp->ls_seqid);
857 kfree(lsp);
858}
859
860/*
861 * Return a compatible lock_state. If no initialized lock_state structure
862 * exists, return an uninitialized one.
863 *
864 */
865static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner)
866{
867 struct nfs4_lock_state *lsp, *new = NULL;
868
869 for(;;) {
870 spin_lock(&state->state_lock);
871 lsp = __nfs4_find_lock_state(state, owner, 0);
872 if (lsp != NULL)
873 break;
874 if (new != NULL) {
875 list_add(&new->ls_locks, &state->lock_states);
876 set_bit(LK_STATE_IN_USE, &state->flags);
877 lsp = new;
878 new = NULL;
879 break;
880 }
881 spin_unlock(&state->state_lock);
882 new = nfs4_alloc_lock_state(state, owner);
883 if (new == NULL)
884 return NULL;
885 }
886 spin_unlock(&state->state_lock);
887 if (new != NULL)
888 nfs4_free_lock_state(state->owner->so_server, new);
889 return lsp;
890}
891
892/*
893 * Release reference to lock_state, and free it if we see that
894 * it is no longer in use
895 */
896void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
897{
898 struct nfs_server *server;
899 struct nfs4_state *state;
900
901 if (lsp == NULL)
902 return;
903 state = lsp->ls_state;
904 if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock))
905 return;
906 list_del(&lsp->ls_locks);
907 if (list_empty(&state->lock_states))
908 clear_bit(LK_STATE_IN_USE, &state->flags);
909 spin_unlock(&state->state_lock);
910 server = state->owner->so_server;
911 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
912 struct nfs_client *clp = server->nfs_client;
913
914 clp->cl_mvops->free_lock_state(server, lsp);
915 } else
916 nfs4_free_lock_state(server, lsp);
917}
918
919static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
920{
921 struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
922
923 dst->fl_u.nfs4_fl.owner = lsp;
924 atomic_inc(&lsp->ls_count);
925}
926
927static void nfs4_fl_release_lock(struct file_lock *fl)
928{
929 nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
930}
931
932static const struct file_lock_operations nfs4_fl_lock_ops = {
933 .fl_copy_lock = nfs4_fl_copy_lock,
934 .fl_release_private = nfs4_fl_release_lock,
935};
936
937int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
938{
939 struct nfs4_lock_state *lsp;
940
941 if (fl->fl_ops != NULL)
942 return 0;
943 lsp = nfs4_get_lock_state(state, fl->fl_owner);
944 if (lsp == NULL)
945 return -ENOMEM;
946 fl->fl_u.nfs4_fl.owner = lsp;
947 fl->fl_ops = &nfs4_fl_lock_ops;
948 return 0;
949}
950
951static int nfs4_copy_lock_stateid(nfs4_stateid *dst,
952 struct nfs4_state *state,
953 const struct nfs_lock_context *l_ctx)
954{
955 struct nfs4_lock_state *lsp;
956 fl_owner_t fl_owner, fl_flock_owner;
957 int ret = -ENOENT;
958
959 if (l_ctx == NULL)
960 goto out;
961
962 if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
963 goto out;
964
965 fl_owner = l_ctx->lockowner;
966 fl_flock_owner = l_ctx->open_context->flock_owner;
967
968 spin_lock(&state->state_lock);
969 lsp = __nfs4_find_lock_state(state, fl_owner, fl_flock_owner);
970 if (lsp && test_bit(NFS_LOCK_LOST, &lsp->ls_flags))
971 ret = -EIO;
972 else if (lsp != NULL && test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) {
973 nfs4_stateid_copy(dst, &lsp->ls_stateid);
974 ret = 0;
975 }
976 spin_unlock(&state->state_lock);
977 nfs4_put_lock_state(lsp);
978out:
979 return ret;
980}
981
982static void nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state)
983{
984 const nfs4_stateid *src;
985 int seq;
986
987 do {
988 src = &zero_stateid;
989 seq = read_seqbegin(&state->seqlock);
990 if (test_bit(NFS_OPEN_STATE, &state->flags))
991 src = &state->open_stateid;
992 nfs4_stateid_copy(dst, src);
993 } while (read_seqretry(&state->seqlock, seq));
994}
995
996/*
997 * Byte-range lock aware utility to initialize the stateid of read/write
998 * requests.
999 */
1000int nfs4_select_rw_stateid(struct nfs4_state *state,
1001 fmode_t fmode, const struct nfs_lock_context *l_ctx,
1002 nfs4_stateid *dst, struct rpc_cred **cred)
1003{
1004 int ret;
1005
1006 if (!nfs4_valid_open_stateid(state))
1007 return -EIO;
1008 if (cred != NULL)
1009 *cred = NULL;
1010 ret = nfs4_copy_lock_stateid(dst, state, l_ctx);
1011 if (ret == -EIO)
1012 /* A lost lock - don't even consider delegations */
1013 goto out;
1014 /* returns true if delegation stateid found and copied */
1015 if (nfs4_copy_delegation_stateid(state->inode, fmode, dst, cred)) {
1016 ret = 0;
1017 goto out;
1018 }
1019 if (ret != -ENOENT)
1020 /* nfs4_copy_delegation_stateid() didn't over-write
1021 * dst, so it still has the lock stateid which we now
1022 * choose to use.
1023 */
1024 goto out;
1025 nfs4_copy_open_stateid(dst, state);
1026 ret = 0;
1027out:
1028 if (nfs_server_capable(state->inode, NFS_CAP_STATEID_NFSV41))
1029 dst->seqid = 0;
1030 return ret;
1031}
1032
1033struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask)
1034{
1035 struct nfs_seqid *new;
1036
1037 new = kmalloc(sizeof(*new), gfp_mask);
1038 if (new == NULL)
1039 return ERR_PTR(-ENOMEM);
1040 new->sequence = counter;
1041 INIT_LIST_HEAD(&new->list);
1042 new->task = NULL;
1043 return new;
1044}
1045
1046void nfs_release_seqid(struct nfs_seqid *seqid)
1047{
1048 struct nfs_seqid_counter *sequence;
1049
1050 if (seqid == NULL || list_empty(&seqid->list))
1051 return;
1052 sequence = seqid->sequence;
1053 spin_lock(&sequence->lock);
1054 list_del_init(&seqid->list);
1055 if (!list_empty(&sequence->list)) {
1056 struct nfs_seqid *next;
1057
1058 next = list_first_entry(&sequence->list,
1059 struct nfs_seqid, list);
1060 rpc_wake_up_queued_task(&sequence->wait, next->task);
1061 }
1062 spin_unlock(&sequence->lock);
1063}
1064
1065void nfs_free_seqid(struct nfs_seqid *seqid)
1066{
1067 nfs_release_seqid(seqid);
1068 kfree(seqid);
1069}
1070
1071/*
1072 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
1073 * failed with a seqid incrementing error -
1074 * see comments nfs4.h:seqid_mutating_error()
1075 */
1076static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
1077{
1078 switch (status) {
1079 case 0:
1080 break;
1081 case -NFS4ERR_BAD_SEQID:
1082 if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
1083 return;
1084 pr_warn_ratelimited("NFS: v4 server returned a bad"
1085 " sequence-id error on an"
1086 " unconfirmed sequence %p!\n",
1087 seqid->sequence);
1088 case -NFS4ERR_STALE_CLIENTID:
1089 case -NFS4ERR_STALE_STATEID:
1090 case -NFS4ERR_BAD_STATEID:
1091 case -NFS4ERR_BADXDR:
1092 case -NFS4ERR_RESOURCE:
1093 case -NFS4ERR_NOFILEHANDLE:
1094 case -NFS4ERR_MOVED:
1095 /* Non-seqid mutating errors */
1096 return;
1097 };
1098 /*
1099 * Note: no locking needed as we are guaranteed to be first
1100 * on the sequence list
1101 */
1102 seqid->sequence->counter++;
1103}
1104
1105void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
1106{
1107 struct nfs4_state_owner *sp;
1108
1109 if (seqid == NULL)
1110 return;
1111
1112 sp = container_of(seqid->sequence, struct nfs4_state_owner, so_seqid);
1113 if (status == -NFS4ERR_BAD_SEQID)
1114 nfs4_reset_state_owner(sp);
1115 if (!nfs4_has_session(sp->so_server->nfs_client))
1116 nfs_increment_seqid(status, seqid);
1117}
1118
1119/*
1120 * Increment the seqid if the LOCK/LOCKU succeeded, or
1121 * failed with a seqid incrementing error -
1122 * see comments nfs4.h:seqid_mutating_error()
1123 */
1124void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
1125{
1126 if (seqid != NULL)
1127 nfs_increment_seqid(status, seqid);
1128}
1129
1130int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
1131{
1132 struct nfs_seqid_counter *sequence;
1133 int status = 0;
1134
1135 if (seqid == NULL)
1136 goto out;
1137 sequence = seqid->sequence;
1138 spin_lock(&sequence->lock);
1139 seqid->task = task;
1140 if (list_empty(&seqid->list))
1141 list_add_tail(&seqid->list, &sequence->list);
1142 if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid)
1143 goto unlock;
1144 rpc_sleep_on(&sequence->wait, task, NULL);
1145 status = -EAGAIN;
1146unlock:
1147 spin_unlock(&sequence->lock);
1148out:
1149 return status;
1150}
1151
1152static int nfs4_run_state_manager(void *);
1153
1154static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
1155{
1156 smp_mb__before_atomic();
1157 clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
1158 smp_mb__after_atomic();
1159 wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING);
1160 rpc_wake_up(&clp->cl_rpcwaitq);
1161}
1162
1163/*
1164 * Schedule the nfs_client asynchronous state management routine
1165 */
1166void nfs4_schedule_state_manager(struct nfs_client *clp)
1167{
1168 struct task_struct *task;
1169 char buf[INET6_ADDRSTRLEN + sizeof("-manager") + 1];
1170
1171 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1172 return;
1173 __module_get(THIS_MODULE);
1174 atomic_inc(&clp->cl_count);
1175
1176 /* The rcu_read_lock() is not strictly necessary, as the state
1177 * manager is the only thread that ever changes the rpc_xprt
1178 * after it's initialized. At this point, we're single threaded. */
1179 rcu_read_lock();
1180 snprintf(buf, sizeof(buf), "%s-manager",
1181 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
1182 rcu_read_unlock();
1183 task = kthread_run(nfs4_run_state_manager, clp, "%s", buf);
1184 if (IS_ERR(task)) {
1185 printk(KERN_ERR "%s: kthread_run: %ld\n",
1186 __func__, PTR_ERR(task));
1187 nfs4_clear_state_manager_bit(clp);
1188 nfs_put_client(clp);
1189 module_put(THIS_MODULE);
1190 }
1191}
1192
1193/*
1194 * Schedule a lease recovery attempt
1195 */
1196void nfs4_schedule_lease_recovery(struct nfs_client *clp)
1197{
1198 if (!clp)
1199 return;
1200 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1201 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1202 dprintk("%s: scheduling lease recovery for server %s\n", __func__,
1203 clp->cl_hostname);
1204 nfs4_schedule_state_manager(clp);
1205}
1206EXPORT_SYMBOL_GPL(nfs4_schedule_lease_recovery);
1207
1208/**
1209 * nfs4_schedule_migration_recovery - trigger migration recovery
1210 *
1211 * @server: FSID that is migrating
1212 *
1213 * Returns zero if recovery has started, otherwise a negative NFS4ERR
1214 * value is returned.
1215 */
1216int nfs4_schedule_migration_recovery(const struct nfs_server *server)
1217{
1218 struct nfs_client *clp = server->nfs_client;
1219
1220 if (server->fh_expire_type != NFS4_FH_PERSISTENT) {
1221 pr_err("NFS: volatile file handles not supported (server %s)\n",
1222 clp->cl_hostname);
1223 return -NFS4ERR_IO;
1224 }
1225
1226 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
1227 return -NFS4ERR_IO;
1228
1229 dprintk("%s: scheduling migration recovery for (%llx:%llx) on %s\n",
1230 __func__,
1231 (unsigned long long)server->fsid.major,
1232 (unsigned long long)server->fsid.minor,
1233 clp->cl_hostname);
1234
1235 set_bit(NFS_MIG_IN_TRANSITION,
1236 &((struct nfs_server *)server)->mig_status);
1237 set_bit(NFS4CLNT_MOVED, &clp->cl_state);
1238
1239 nfs4_schedule_state_manager(clp);
1240 return 0;
1241}
1242EXPORT_SYMBOL_GPL(nfs4_schedule_migration_recovery);
1243
1244/**
1245 * nfs4_schedule_lease_moved_recovery - start lease-moved recovery
1246 *
1247 * @clp: server to check for moved leases
1248 *
1249 */
1250void nfs4_schedule_lease_moved_recovery(struct nfs_client *clp)
1251{
1252 dprintk("%s: scheduling lease-moved recovery for client ID %llx on %s\n",
1253 __func__, clp->cl_clientid, clp->cl_hostname);
1254
1255 set_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state);
1256 nfs4_schedule_state_manager(clp);
1257}
1258EXPORT_SYMBOL_GPL(nfs4_schedule_lease_moved_recovery);
1259
1260int nfs4_wait_clnt_recover(struct nfs_client *clp)
1261{
1262 int res;
1263
1264 might_sleep();
1265
1266 atomic_inc(&clp->cl_count);
1267 res = wait_on_bit_action(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
1268 nfs_wait_bit_killable, TASK_KILLABLE);
1269 if (res)
1270 goto out;
1271 if (clp->cl_cons_state < 0)
1272 res = clp->cl_cons_state;
1273out:
1274 nfs_put_client(clp);
1275 return res;
1276}
1277
1278int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1279{
1280 unsigned int loop;
1281 int ret;
1282
1283 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1284 ret = nfs4_wait_clnt_recover(clp);
1285 if (ret != 0)
1286 break;
1287 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1288 !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1289 break;
1290 nfs4_schedule_state_manager(clp);
1291 ret = -EIO;
1292 }
1293 return ret;
1294}
1295
1296/*
1297 * nfs40_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN
1298 * @clp: client to process
1299 *
1300 * Set the NFS4CLNT_LEASE_EXPIRED state in order to force a
1301 * resend of the SETCLIENTID and hence re-establish the
1302 * callback channel. Then return all existing delegations.
1303 */
1304static void nfs40_handle_cb_pathdown(struct nfs_client *clp)
1305{
1306 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1307 nfs_expire_all_delegations(clp);
1308 dprintk("%s: handling CB_PATHDOWN recovery for server %s\n", __func__,
1309 clp->cl_hostname);
1310}
1311
1312void nfs4_schedule_path_down_recovery(struct nfs_client *clp)
1313{
1314 nfs40_handle_cb_pathdown(clp);
1315 nfs4_schedule_state_manager(clp);
1316}
1317
1318static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
1319{
1320
1321 if (!nfs4_valid_open_stateid(state))
1322 return 0;
1323 set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1324 /* Don't recover state that expired before the reboot */
1325 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) {
1326 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1327 return 0;
1328 }
1329 set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags);
1330 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1331 return 1;
1332}
1333
1334int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
1335{
1336 if (!nfs4_valid_open_stateid(state))
1337 return 0;
1338 set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
1339 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1340 set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags);
1341 set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
1342 return 1;
1343}
1344
1345int nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state)
1346{
1347 struct nfs_client *clp = server->nfs_client;
1348
1349 if (!nfs4_state_mark_reclaim_nograce(clp, state))
1350 return -EBADF;
1351 dprintk("%s: scheduling stateid recovery for server %s\n", __func__,
1352 clp->cl_hostname);
1353 nfs4_schedule_state_manager(clp);
1354 return 0;
1355}
1356EXPORT_SYMBOL_GPL(nfs4_schedule_stateid_recovery);
1357
1358static struct nfs4_lock_state *
1359nfs_state_find_lock_state_by_stateid(struct nfs4_state *state,
1360 const nfs4_stateid *stateid)
1361{
1362 struct nfs4_lock_state *pos;
1363
1364 list_for_each_entry(pos, &state->lock_states, ls_locks) {
1365 if (!test_bit(NFS_LOCK_INITIALIZED, &pos->ls_flags))
1366 continue;
1367 if (nfs4_stateid_match_other(&pos->ls_stateid, stateid))
1368 return pos;
1369 }
1370 return NULL;
1371}
1372
1373static bool nfs_state_lock_state_matches_stateid(struct nfs4_state *state,
1374 const nfs4_stateid *stateid)
1375{
1376 bool found = false;
1377
1378 if (test_bit(LK_STATE_IN_USE, &state->flags)) {
1379 spin_lock(&state->state_lock);
1380 if (nfs_state_find_lock_state_by_stateid(state, stateid))
1381 found = true;
1382 spin_unlock(&state->state_lock);
1383 }
1384 return found;
1385}
1386
1387void nfs_inode_find_state_and_recover(struct inode *inode,
1388 const nfs4_stateid *stateid)
1389{
1390 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
1391 struct nfs_inode *nfsi = NFS_I(inode);
1392 struct nfs_open_context *ctx;
1393 struct nfs4_state *state;
1394 bool found = false;
1395
1396 spin_lock(&inode->i_lock);
1397 list_for_each_entry(ctx, &nfsi->open_files, list) {
1398 state = ctx->state;
1399 if (state == NULL)
1400 continue;
1401 if (nfs4_stateid_match_other(&state->stateid, stateid) &&
1402 nfs4_state_mark_reclaim_nograce(clp, state)) {
1403 found = true;
1404 continue;
1405 }
1406 if (nfs_state_lock_state_matches_stateid(state, stateid) &&
1407 nfs4_state_mark_reclaim_nograce(clp, state))
1408 found = true;
1409 }
1410 spin_unlock(&inode->i_lock);
1411
1412 nfs_inode_find_delegation_state_and_recover(inode, stateid);
1413 if (found)
1414 nfs4_schedule_state_manager(clp);
1415}
1416
1417static void nfs4_state_mark_open_context_bad(struct nfs4_state *state)
1418{
1419 struct inode *inode = state->inode;
1420 struct nfs_inode *nfsi = NFS_I(inode);
1421 struct nfs_open_context *ctx;
1422
1423 spin_lock(&inode->i_lock);
1424 list_for_each_entry(ctx, &nfsi->open_files, list) {
1425 if (ctx->state != state)
1426 continue;
1427 set_bit(NFS_CONTEXT_BAD, &ctx->flags);
1428 }
1429 spin_unlock(&inode->i_lock);
1430}
1431
1432static void nfs4_state_mark_recovery_failed(struct nfs4_state *state, int error)
1433{
1434 set_bit(NFS_STATE_RECOVERY_FAILED, &state->flags);
1435 nfs4_state_mark_open_context_bad(state);
1436}
1437
1438
1439static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
1440{
1441 struct inode *inode = state->inode;
1442 struct nfs_inode *nfsi = NFS_I(inode);
1443 struct file_lock *fl;
1444 int status = 0;
1445 struct file_lock_context *flctx = inode->i_flctx;
1446 struct list_head *list;
1447
1448 if (flctx == NULL)
1449 return 0;
1450
1451 list = &flctx->flc_posix;
1452
1453 /* Guard against delegation returns and new lock/unlock calls */
1454 down_write(&nfsi->rwsem);
1455 spin_lock(&flctx->flc_lock);
1456restart:
1457 list_for_each_entry(fl, list, fl_list) {
1458 if (nfs_file_open_context(fl->fl_file)->state != state)
1459 continue;
1460 spin_unlock(&flctx->flc_lock);
1461 status = ops->recover_lock(state, fl);
1462 switch (status) {
1463 case 0:
1464 break;
1465 case -ESTALE:
1466 case -NFS4ERR_ADMIN_REVOKED:
1467 case -NFS4ERR_STALE_STATEID:
1468 case -NFS4ERR_BAD_STATEID:
1469 case -NFS4ERR_EXPIRED:
1470 case -NFS4ERR_NO_GRACE:
1471 case -NFS4ERR_STALE_CLIENTID:
1472 case -NFS4ERR_BADSESSION:
1473 case -NFS4ERR_BADSLOT:
1474 case -NFS4ERR_BAD_HIGH_SLOT:
1475 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1476 goto out;
1477 default:
1478 pr_err("NFS: %s: unhandled error %d\n",
1479 __func__, status);
1480 case -ENOMEM:
1481 case -NFS4ERR_DENIED:
1482 case -NFS4ERR_RECLAIM_BAD:
1483 case -NFS4ERR_RECLAIM_CONFLICT:
1484 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1485 status = 0;
1486 }
1487 spin_lock(&flctx->flc_lock);
1488 }
1489 if (list == &flctx->flc_posix) {
1490 list = &flctx->flc_flock;
1491 goto restart;
1492 }
1493 spin_unlock(&flctx->flc_lock);
1494out:
1495 up_write(&nfsi->rwsem);
1496 return status;
1497}
1498
1499static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops)
1500{
1501 struct nfs4_state *state;
1502 struct nfs4_lock_state *lock;
1503 int status = 0;
1504
1505 /* Note: we rely on the sp->so_states list being ordered
1506 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
1507 * states first.
1508 * This is needed to ensure that the server won't give us any
1509 * read delegations that we have to return if, say, we are
1510 * recovering after a network partition or a reboot from a
1511 * server that doesn't support a grace period.
1512 */
1513 spin_lock(&sp->so_lock);
1514 raw_write_seqcount_begin(&sp->so_reclaim_seqcount);
1515restart:
1516 list_for_each_entry(state, &sp->so_states, open_states) {
1517 if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
1518 continue;
1519 if (!nfs4_valid_open_stateid(state))
1520 continue;
1521 if (state->state == 0)
1522 continue;
1523 atomic_inc(&state->count);
1524 spin_unlock(&sp->so_lock);
1525 status = ops->recover_open(sp, state);
1526 if (status >= 0) {
1527 status = nfs4_reclaim_locks(state, ops);
1528 if (status >= 0) {
1529 if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) {
1530 spin_lock(&state->state_lock);
1531 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1532 if (!test_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags))
1533 pr_warn_ratelimited("NFS: "
1534 "%s: Lock reclaim "
1535 "failed!\n", __func__);
1536 }
1537 spin_unlock(&state->state_lock);
1538 }
1539 clear_bit(NFS_STATE_RECLAIM_NOGRACE,
1540 &state->flags);
1541 nfs4_put_open_state(state);
1542 spin_lock(&sp->so_lock);
1543 goto restart;
1544 }
1545 }
1546 switch (status) {
1547 default:
1548 printk(KERN_ERR "NFS: %s: unhandled error %d\n",
1549 __func__, status);
1550 case -ENOENT:
1551 case -ENOMEM:
1552 case -EACCES:
1553 case -EROFS:
1554 case -EIO:
1555 case -ESTALE:
1556 /* Open state on this file cannot be recovered */
1557 nfs4_state_mark_recovery_failed(state, status);
1558 break;
1559 case -EAGAIN:
1560 ssleep(1);
1561 case -NFS4ERR_ADMIN_REVOKED:
1562 case -NFS4ERR_STALE_STATEID:
1563 case -NFS4ERR_OLD_STATEID:
1564 case -NFS4ERR_BAD_STATEID:
1565 case -NFS4ERR_RECLAIM_BAD:
1566 case -NFS4ERR_RECLAIM_CONFLICT:
1567 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1568 break;
1569 case -NFS4ERR_EXPIRED:
1570 case -NFS4ERR_NO_GRACE:
1571 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1572 case -NFS4ERR_STALE_CLIENTID:
1573 case -NFS4ERR_BADSESSION:
1574 case -NFS4ERR_BADSLOT:
1575 case -NFS4ERR_BAD_HIGH_SLOT:
1576 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1577 goto out_err;
1578 }
1579 nfs4_put_open_state(state);
1580 spin_lock(&sp->so_lock);
1581 goto restart;
1582 }
1583 raw_write_seqcount_end(&sp->so_reclaim_seqcount);
1584 spin_unlock(&sp->so_lock);
1585 return 0;
1586out_err:
1587 nfs4_put_open_state(state);
1588 spin_lock(&sp->so_lock);
1589 raw_write_seqcount_end(&sp->so_reclaim_seqcount);
1590 spin_unlock(&sp->so_lock);
1591 return status;
1592}
1593
1594static void nfs4_clear_open_state(struct nfs4_state *state)
1595{
1596 struct nfs4_lock_state *lock;
1597
1598 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1599 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1600 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1601 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1602 spin_lock(&state->state_lock);
1603 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1604 lock->ls_seqid.flags = 0;
1605 clear_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags);
1606 }
1607 spin_unlock(&state->state_lock);
1608}
1609
1610static void nfs4_reset_seqids(struct nfs_server *server,
1611 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1612{
1613 struct nfs_client *clp = server->nfs_client;
1614 struct nfs4_state_owner *sp;
1615 struct rb_node *pos;
1616 struct nfs4_state *state;
1617
1618 spin_lock(&clp->cl_lock);
1619 for (pos = rb_first(&server->state_owners);
1620 pos != NULL;
1621 pos = rb_next(pos)) {
1622 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1623 sp->so_seqid.flags = 0;
1624 spin_lock(&sp->so_lock);
1625 list_for_each_entry(state, &sp->so_states, open_states) {
1626 if (mark_reclaim(clp, state))
1627 nfs4_clear_open_state(state);
1628 }
1629 spin_unlock(&sp->so_lock);
1630 }
1631 spin_unlock(&clp->cl_lock);
1632}
1633
1634static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp,
1635 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1636{
1637 struct nfs_server *server;
1638
1639 rcu_read_lock();
1640 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1641 nfs4_reset_seqids(server, mark_reclaim);
1642 rcu_read_unlock();
1643}
1644
1645static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
1646{
1647 /* Mark all delegations for reclaim */
1648 nfs_delegation_mark_reclaim(clp);
1649 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot);
1650}
1651
1652static void nfs4_reclaim_complete(struct nfs_client *clp,
1653 const struct nfs4_state_recovery_ops *ops,
1654 struct rpc_cred *cred)
1655{
1656 /* Notify the server we're done reclaiming our state */
1657 if (ops->reclaim_complete)
1658 (void)ops->reclaim_complete(clp, cred);
1659}
1660
1661static void nfs4_clear_reclaim_server(struct nfs_server *server)
1662{
1663 struct nfs_client *clp = server->nfs_client;
1664 struct nfs4_state_owner *sp;
1665 struct rb_node *pos;
1666 struct nfs4_state *state;
1667
1668 spin_lock(&clp->cl_lock);
1669 for (pos = rb_first(&server->state_owners);
1670 pos != NULL;
1671 pos = rb_next(pos)) {
1672 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1673 spin_lock(&sp->so_lock);
1674 list_for_each_entry(state, &sp->so_states, open_states) {
1675 if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT,
1676 &state->flags))
1677 continue;
1678 nfs4_state_mark_reclaim_nograce(clp, state);
1679 }
1680 spin_unlock(&sp->so_lock);
1681 }
1682 spin_unlock(&clp->cl_lock);
1683}
1684
1685static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp)
1686{
1687 struct nfs_server *server;
1688
1689 if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1690 return 0;
1691
1692 rcu_read_lock();
1693 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1694 nfs4_clear_reclaim_server(server);
1695 rcu_read_unlock();
1696
1697 nfs_delegation_reap_unclaimed(clp);
1698 return 1;
1699}
1700
1701static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
1702{
1703 const struct nfs4_state_recovery_ops *ops;
1704 struct rpc_cred *cred;
1705
1706 if (!nfs4_state_clear_reclaim_reboot(clp))
1707 return;
1708 ops = clp->cl_mvops->reboot_recovery_ops;
1709 cred = nfs4_get_clid_cred(clp);
1710 nfs4_reclaim_complete(clp, ops, cred);
1711 put_rpccred(cred);
1712}
1713
1714static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
1715{
1716 nfs_mark_test_expired_all_delegations(clp);
1717 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
1718}
1719
1720static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
1721{
1722 switch (error) {
1723 case 0:
1724 break;
1725 case -NFS4ERR_CB_PATH_DOWN:
1726 nfs40_handle_cb_pathdown(clp);
1727 break;
1728 case -NFS4ERR_NO_GRACE:
1729 nfs4_state_end_reclaim_reboot(clp);
1730 break;
1731 case -NFS4ERR_STALE_CLIENTID:
1732 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1733 nfs4_state_start_reclaim_reboot(clp);
1734 break;
1735 case -NFS4ERR_EXPIRED:
1736 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1737 nfs4_state_start_reclaim_nograce(clp);
1738 break;
1739 case -NFS4ERR_BADSESSION:
1740 case -NFS4ERR_BADSLOT:
1741 case -NFS4ERR_BAD_HIGH_SLOT:
1742 case -NFS4ERR_DEADSESSION:
1743 case -NFS4ERR_SEQ_FALSE_RETRY:
1744 case -NFS4ERR_SEQ_MISORDERED:
1745 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1746 /* Zero session reset errors */
1747 break;
1748 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1749 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
1750 break;
1751 default:
1752 dprintk("%s: failed to handle error %d for server %s\n",
1753 __func__, error, clp->cl_hostname);
1754 return error;
1755 }
1756 dprintk("%s: handled error %d for server %s\n", __func__, error,
1757 clp->cl_hostname);
1758 return 0;
1759}
1760
1761static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
1762{
1763 struct nfs4_state_owner *sp;
1764 struct nfs_server *server;
1765 struct rb_node *pos;
1766 int status = 0;
1767
1768restart:
1769 rcu_read_lock();
1770 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
1771 nfs4_purge_state_owners(server);
1772 spin_lock(&clp->cl_lock);
1773 for (pos = rb_first(&server->state_owners);
1774 pos != NULL;
1775 pos = rb_next(pos)) {
1776 sp = rb_entry(pos,
1777 struct nfs4_state_owner, so_server_node);
1778 if (!test_and_clear_bit(ops->owner_flag_bit,
1779 &sp->so_flags))
1780 continue;
1781 if (!atomic_inc_not_zero(&sp->so_count))
1782 continue;
1783 spin_unlock(&clp->cl_lock);
1784 rcu_read_unlock();
1785
1786 status = nfs4_reclaim_open_state(sp, ops);
1787 if (status < 0) {
1788 set_bit(ops->owner_flag_bit, &sp->so_flags);
1789 nfs4_put_state_owner(sp);
1790 status = nfs4_recovery_handle_error(clp, status);
1791 return (status != 0) ? status : -EAGAIN;
1792 }
1793
1794 nfs4_put_state_owner(sp);
1795 goto restart;
1796 }
1797 spin_unlock(&clp->cl_lock);
1798 }
1799 rcu_read_unlock();
1800 return 0;
1801}
1802
1803static int nfs4_check_lease(struct nfs_client *clp)
1804{
1805 struct rpc_cred *cred;
1806 const struct nfs4_state_maintenance_ops *ops =
1807 clp->cl_mvops->state_renewal_ops;
1808 int status;
1809
1810 /* Is the client already known to have an expired lease? */
1811 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1812 return 0;
1813 spin_lock(&clp->cl_lock);
1814 cred = ops->get_state_renewal_cred_locked(clp);
1815 spin_unlock(&clp->cl_lock);
1816 if (cred == NULL) {
1817 cred = nfs4_get_clid_cred(clp);
1818 status = -ENOKEY;
1819 if (cred == NULL)
1820 goto out;
1821 }
1822 status = ops->renew_lease(clp, cred);
1823 put_rpccred(cred);
1824 if (status == -ETIMEDOUT) {
1825 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1826 return 0;
1827 }
1828out:
1829 return nfs4_recovery_handle_error(clp, status);
1830}
1831
1832/* Set NFS4CLNT_LEASE_EXPIRED and reclaim reboot state for all v4.0 errors
1833 * and for recoverable errors on EXCHANGE_ID for v4.1
1834 */
1835static int nfs4_handle_reclaim_lease_error(struct nfs_client *clp, int status)
1836{
1837 switch (status) {
1838 case -NFS4ERR_SEQ_MISORDERED:
1839 if (test_and_set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state))
1840 return -ESERVERFAULT;
1841 /* Lease confirmation error: retry after purging the lease */
1842 ssleep(1);
1843 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1844 break;
1845 case -NFS4ERR_STALE_CLIENTID:
1846 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1847 nfs4_state_start_reclaim_reboot(clp);
1848 break;
1849 case -NFS4ERR_CLID_INUSE:
1850 pr_err("NFS: Server %s reports our clientid is in use\n",
1851 clp->cl_hostname);
1852 nfs_mark_client_ready(clp, -EPERM);
1853 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1854 return -EPERM;
1855 case -EACCES:
1856 case -NFS4ERR_DELAY:
1857 case -ETIMEDOUT:
1858 case -EAGAIN:
1859 ssleep(1);
1860 break;
1861
1862 case -NFS4ERR_MINOR_VERS_MISMATCH:
1863 if (clp->cl_cons_state == NFS_CS_SESSION_INITING)
1864 nfs_mark_client_ready(clp, -EPROTONOSUPPORT);
1865 dprintk("%s: exit with error %d for server %s\n",
1866 __func__, -EPROTONOSUPPORT, clp->cl_hostname);
1867 return -EPROTONOSUPPORT;
1868 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
1869 * in nfs4_exchange_id */
1870 default:
1871 dprintk("%s: exit with error %d for server %s\n", __func__,
1872 status, clp->cl_hostname);
1873 return status;
1874 }
1875 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1876 dprintk("%s: handled error %d for server %s\n", __func__, status,
1877 clp->cl_hostname);
1878 return 0;
1879}
1880
1881static int nfs4_establish_lease(struct nfs_client *clp)
1882{
1883 struct rpc_cred *cred;
1884 const struct nfs4_state_recovery_ops *ops =
1885 clp->cl_mvops->reboot_recovery_ops;
1886 int status;
1887
1888 nfs4_begin_drain_session(clp);
1889 cred = nfs4_get_clid_cred(clp);
1890 if (cred == NULL)
1891 return -ENOENT;
1892 status = ops->establish_clid(clp, cred);
1893 put_rpccred(cred);
1894 if (status != 0)
1895 return status;
1896 pnfs_destroy_all_layouts(clp);
1897 return 0;
1898}
1899
1900/*
1901 * Returns zero or a negative errno. NFS4ERR values are converted
1902 * to local errno values.
1903 */
1904static int nfs4_reclaim_lease(struct nfs_client *clp)
1905{
1906 int status;
1907
1908 status = nfs4_establish_lease(clp);
1909 if (status < 0)
1910 return nfs4_handle_reclaim_lease_error(clp, status);
1911 if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state))
1912 nfs4_state_start_reclaim_nograce(clp);
1913 if (!test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
1914 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1915 clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1916 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1917 return 0;
1918}
1919
1920static int nfs4_purge_lease(struct nfs_client *clp)
1921{
1922 int status;
1923
1924 status = nfs4_establish_lease(clp);
1925 if (status < 0)
1926 return nfs4_handle_reclaim_lease_error(clp, status);
1927 clear_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
1928 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1929 nfs4_state_start_reclaim_nograce(clp);
1930 return 0;
1931}
1932
1933/*
1934 * Try remote migration of one FSID from a source server to a
1935 * destination server. The source server provides a list of
1936 * potential destinations.
1937 *
1938 * Returns zero or a negative NFS4ERR status code.
1939 */
1940static int nfs4_try_migration(struct nfs_server *server, struct rpc_cred *cred)
1941{
1942 struct nfs_client *clp = server->nfs_client;
1943 struct nfs4_fs_locations *locations = NULL;
1944 struct inode *inode;
1945 struct page *page;
1946 int status, result;
1947
1948 dprintk("--> %s: FSID %llx:%llx on \"%s\"\n", __func__,
1949 (unsigned long long)server->fsid.major,
1950 (unsigned long long)server->fsid.minor,
1951 clp->cl_hostname);
1952
1953 result = 0;
1954 page = alloc_page(GFP_KERNEL);
1955 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1956 if (page == NULL || locations == NULL) {
1957 dprintk("<-- %s: no memory\n", __func__);
1958 goto out;
1959 }
1960
1961 inode = d_inode(server->super->s_root);
1962 result = nfs4_proc_get_locations(inode, locations, page, cred);
1963 if (result) {
1964 dprintk("<-- %s: failed to retrieve fs_locations: %d\n",
1965 __func__, result);
1966 goto out;
1967 }
1968
1969 result = -NFS4ERR_NXIO;
1970 if (!(locations->fattr.valid & NFS_ATTR_FATTR_V4_LOCATIONS)) {
1971 dprintk("<-- %s: No fs_locations data, migration skipped\n",
1972 __func__);
1973 goto out;
1974 }
1975
1976 nfs4_begin_drain_session(clp);
1977
1978 status = nfs4_replace_transport(server, locations);
1979 if (status != 0) {
1980 dprintk("<-- %s: failed to replace transport: %d\n",
1981 __func__, status);
1982 goto out;
1983 }
1984
1985 result = 0;
1986 dprintk("<-- %s: migration succeeded\n", __func__);
1987
1988out:
1989 if (page != NULL)
1990 __free_page(page);
1991 kfree(locations);
1992 if (result) {
1993 pr_err("NFS: migration recovery failed (server %s)\n",
1994 clp->cl_hostname);
1995 set_bit(NFS_MIG_FAILED, &server->mig_status);
1996 }
1997 return result;
1998}
1999
2000/*
2001 * Returns zero or a negative NFS4ERR status code.
2002 */
2003static int nfs4_handle_migration(struct nfs_client *clp)
2004{
2005 const struct nfs4_state_maintenance_ops *ops =
2006 clp->cl_mvops->state_renewal_ops;
2007 struct nfs_server *server;
2008 struct rpc_cred *cred;
2009
2010 dprintk("%s: migration reported on \"%s\"\n", __func__,
2011 clp->cl_hostname);
2012
2013 spin_lock(&clp->cl_lock);
2014 cred = ops->get_state_renewal_cred_locked(clp);
2015 spin_unlock(&clp->cl_lock);
2016 if (cred == NULL)
2017 return -NFS4ERR_NOENT;
2018
2019 clp->cl_mig_gen++;
2020restart:
2021 rcu_read_lock();
2022 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
2023 int status;
2024
2025 if (server->mig_gen == clp->cl_mig_gen)
2026 continue;
2027 server->mig_gen = clp->cl_mig_gen;
2028
2029 if (!test_and_clear_bit(NFS_MIG_IN_TRANSITION,
2030 &server->mig_status))
2031 continue;
2032
2033 rcu_read_unlock();
2034 status = nfs4_try_migration(server, cred);
2035 if (status < 0) {
2036 put_rpccred(cred);
2037 return status;
2038 }
2039 goto restart;
2040 }
2041 rcu_read_unlock();
2042 put_rpccred(cred);
2043 return 0;
2044}
2045
2046/*
2047 * Test each nfs_server on the clp's cl_superblocks list to see
2048 * if it's moved to another server. Stop when the server no longer
2049 * returns NFS4ERR_LEASE_MOVED.
2050 */
2051static int nfs4_handle_lease_moved(struct nfs_client *clp)
2052{
2053 const struct nfs4_state_maintenance_ops *ops =
2054 clp->cl_mvops->state_renewal_ops;
2055 struct nfs_server *server;
2056 struct rpc_cred *cred;
2057
2058 dprintk("%s: lease moved reported on \"%s\"\n", __func__,
2059 clp->cl_hostname);
2060
2061 spin_lock(&clp->cl_lock);
2062 cred = ops->get_state_renewal_cred_locked(clp);
2063 spin_unlock(&clp->cl_lock);
2064 if (cred == NULL)
2065 return -NFS4ERR_NOENT;
2066
2067 clp->cl_mig_gen++;
2068restart:
2069 rcu_read_lock();
2070 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
2071 struct inode *inode;
2072 int status;
2073
2074 if (server->mig_gen == clp->cl_mig_gen)
2075 continue;
2076 server->mig_gen = clp->cl_mig_gen;
2077
2078 rcu_read_unlock();
2079
2080 inode = d_inode(server->super->s_root);
2081 status = nfs4_proc_fsid_present(inode, cred);
2082 if (status != -NFS4ERR_MOVED)
2083 goto restart; /* wasn't this one */
2084 if (nfs4_try_migration(server, cred) == -NFS4ERR_LEASE_MOVED)
2085 goto restart; /* there are more */
2086 goto out;
2087 }
2088 rcu_read_unlock();
2089
2090out:
2091 put_rpccred(cred);
2092 return 0;
2093}
2094
2095/**
2096 * nfs4_discover_server_trunking - Detect server IP address trunking
2097 *
2098 * @clp: nfs_client under test
2099 * @result: OUT: found nfs_client, or clp
2100 *
2101 * Returns zero or a negative errno. If zero is returned,
2102 * an nfs_client pointer is planted in "result".
2103 *
2104 * Note: since we are invoked in process context, and
2105 * not from inside the state manager, we cannot use
2106 * nfs4_handle_reclaim_lease_error().
2107 */
2108int nfs4_discover_server_trunking(struct nfs_client *clp,
2109 struct nfs_client **result)
2110{
2111 const struct nfs4_state_recovery_ops *ops =
2112 clp->cl_mvops->reboot_recovery_ops;
2113 struct rpc_clnt *clnt;
2114 struct rpc_cred *cred;
2115 int i, status;
2116
2117 dprintk("NFS: %s: testing '%s'\n", __func__, clp->cl_hostname);
2118
2119 clnt = clp->cl_rpcclient;
2120 i = 0;
2121
2122 mutex_lock(&nfs_clid_init_mutex);
2123again:
2124 status = -ENOENT;
2125 cred = nfs4_get_clid_cred(clp);
2126 if (cred == NULL)
2127 goto out_unlock;
2128
2129 status = ops->detect_trunking(clp, result, cred);
2130 put_rpccred(cred);
2131 switch (status) {
2132 case 0:
2133 break;
2134 case -ETIMEDOUT:
2135 if (clnt->cl_softrtry)
2136 break;
2137 case -NFS4ERR_DELAY:
2138 case -EAGAIN:
2139 ssleep(1);
2140 case -NFS4ERR_STALE_CLIENTID:
2141 dprintk("NFS: %s after status %d, retrying\n",
2142 __func__, status);
2143 goto again;
2144 case -EACCES:
2145 if (i++ == 0) {
2146 nfs4_root_machine_cred(clp);
2147 goto again;
2148 }
2149 if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX)
2150 break;
2151 case -NFS4ERR_CLID_INUSE:
2152 case -NFS4ERR_WRONGSEC:
2153 /* No point in retrying if we already used RPC_AUTH_UNIX */
2154 if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX) {
2155 status = -EPERM;
2156 break;
2157 }
2158 clnt = rpc_clone_client_set_auth(clnt, RPC_AUTH_UNIX);
2159 if (IS_ERR(clnt)) {
2160 status = PTR_ERR(clnt);
2161 break;
2162 }
2163 /* Note: this is safe because we haven't yet marked the
2164 * client as ready, so we are the only user of
2165 * clp->cl_rpcclient
2166 */
2167 clnt = xchg(&clp->cl_rpcclient, clnt);
2168 rpc_shutdown_client(clnt);
2169 clnt = clp->cl_rpcclient;
2170 goto again;
2171
2172 case -NFS4ERR_MINOR_VERS_MISMATCH:
2173 status = -EPROTONOSUPPORT;
2174 break;
2175
2176 case -EKEYEXPIRED:
2177 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
2178 * in nfs4_exchange_id */
2179 status = -EKEYEXPIRED;
2180 break;
2181 default:
2182 pr_warn("NFS: %s unhandled error %d. Exiting with error EIO\n",
2183 __func__, status);
2184 status = -EIO;
2185 }
2186
2187out_unlock:
2188 mutex_unlock(&nfs_clid_init_mutex);
2189 dprintk("NFS: %s: status = %d\n", __func__, status);
2190 return status;
2191}
2192
2193#ifdef CONFIG_NFS_V4_1
2194void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
2195{
2196 struct nfs_client *clp = session->clp;
2197
2198 switch (err) {
2199 default:
2200 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2201 break;
2202 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
2203 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2204 }
2205 nfs4_schedule_state_manager(clp);
2206}
2207EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery);
2208
2209void nfs41_notify_server(struct nfs_client *clp)
2210{
2211 /* Use CHECK_LEASE to ping the server with a SEQUENCE */
2212 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
2213 nfs4_schedule_state_manager(clp);
2214}
2215
2216static void nfs4_reset_all_state(struct nfs_client *clp)
2217{
2218 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
2219 set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
2220 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
2221 nfs4_state_start_reclaim_nograce(clp);
2222 dprintk("%s: scheduling reset of all state for server %s!\n",
2223 __func__, clp->cl_hostname);
2224 nfs4_schedule_state_manager(clp);
2225 }
2226}
2227
2228static void nfs41_handle_server_reboot(struct nfs_client *clp)
2229{
2230 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
2231 nfs4_state_start_reclaim_reboot(clp);
2232 dprintk("%s: server %s rebooted!\n", __func__,
2233 clp->cl_hostname);
2234 nfs4_schedule_state_manager(clp);
2235 }
2236}
2237
2238static void nfs41_handle_all_state_revoked(struct nfs_client *clp)
2239{
2240 nfs4_reset_all_state(clp);
2241 dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
2242}
2243
2244static void nfs41_handle_some_state_revoked(struct nfs_client *clp)
2245{
2246 nfs4_state_start_reclaim_nograce(clp);
2247 nfs4_schedule_state_manager(clp);
2248
2249 dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
2250}
2251
2252static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp)
2253{
2254 /* FIXME: For now, we destroy all layouts. */
2255 pnfs_destroy_all_layouts(clp);
2256 /* FIXME: For now, we test all delegations+open state+locks. */
2257 nfs41_handle_some_state_revoked(clp);
2258 dprintk("%s: Recallable state revoked on server %s!\n", __func__,
2259 clp->cl_hostname);
2260}
2261
2262static void nfs41_handle_backchannel_fault(struct nfs_client *clp)
2263{
2264 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2265 nfs4_schedule_state_manager(clp);
2266
2267 dprintk("%s: server %s declared a backchannel fault\n", __func__,
2268 clp->cl_hostname);
2269}
2270
2271static void nfs41_handle_cb_path_down(struct nfs_client *clp)
2272{
2273 if (test_and_set_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
2274 &clp->cl_state) == 0)
2275 nfs4_schedule_state_manager(clp);
2276}
2277
2278void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags,
2279 bool recovery)
2280{
2281 if (!flags)
2282 return;
2283
2284 dprintk("%s: \"%s\" (client ID %llx) flags=0x%08x\n",
2285 __func__, clp->cl_hostname, clp->cl_clientid, flags);
2286 /*
2287 * If we're called from the state manager thread, then assume we're
2288 * already handling the RECLAIM_NEEDED and/or STATE_REVOKED.
2289 * Those flags are expected to remain set until we're done
2290 * recovering (see RFC5661, section 18.46.3).
2291 */
2292 if (recovery)
2293 goto out_recovery;
2294
2295 if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED)
2296 nfs41_handle_server_reboot(clp);
2297 if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED))
2298 nfs41_handle_all_state_revoked(clp);
2299 if (flags & (SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED |
2300 SEQ4_STATUS_ADMIN_STATE_REVOKED))
2301 nfs41_handle_some_state_revoked(clp);
2302 if (flags & SEQ4_STATUS_LEASE_MOVED)
2303 nfs4_schedule_lease_moved_recovery(clp);
2304 if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED)
2305 nfs41_handle_recallable_state_revoked(clp);
2306out_recovery:
2307 if (flags & SEQ4_STATUS_BACKCHANNEL_FAULT)
2308 nfs41_handle_backchannel_fault(clp);
2309 else if (flags & (SEQ4_STATUS_CB_PATH_DOWN |
2310 SEQ4_STATUS_CB_PATH_DOWN_SESSION))
2311 nfs41_handle_cb_path_down(clp);
2312}
2313
2314static int nfs4_reset_session(struct nfs_client *clp)
2315{
2316 struct rpc_cred *cred;
2317 int status;
2318
2319 if (!nfs4_has_session(clp))
2320 return 0;
2321 nfs4_begin_drain_session(clp);
2322 cred = nfs4_get_clid_cred(clp);
2323 status = nfs4_proc_destroy_session(clp->cl_session, cred);
2324 switch (status) {
2325 case 0:
2326 case -NFS4ERR_BADSESSION:
2327 case -NFS4ERR_DEADSESSION:
2328 break;
2329 case -NFS4ERR_BACK_CHAN_BUSY:
2330 case -NFS4ERR_DELAY:
2331 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2332 status = 0;
2333 ssleep(1);
2334 goto out;
2335 default:
2336 status = nfs4_recovery_handle_error(clp, status);
2337 goto out;
2338 }
2339
2340 memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
2341 status = nfs4_proc_create_session(clp, cred);
2342 if (status) {
2343 dprintk("%s: session reset failed with status %d for server %s!\n",
2344 __func__, status, clp->cl_hostname);
2345 status = nfs4_handle_reclaim_lease_error(clp, status);
2346 goto out;
2347 }
2348 nfs41_finish_session_reset(clp);
2349 dprintk("%s: session reset was successful for server %s!\n",
2350 __func__, clp->cl_hostname);
2351out:
2352 if (cred)
2353 put_rpccred(cred);
2354 return status;
2355}
2356
2357static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2358{
2359 struct rpc_cred *cred;
2360 int ret;
2361
2362 if (!nfs4_has_session(clp))
2363 return 0;
2364 nfs4_begin_drain_session(clp);
2365 cred = nfs4_get_clid_cred(clp);
2366 ret = nfs4_proc_bind_conn_to_session(clp, cred);
2367 if (cred)
2368 put_rpccred(cred);
2369 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2370 switch (ret) {
2371 case 0:
2372 dprintk("%s: bind_conn_to_session was successful for server %s!\n",
2373 __func__, clp->cl_hostname);
2374 break;
2375 case -NFS4ERR_DELAY:
2376 ssleep(1);
2377 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2378 break;
2379 default:
2380 return nfs4_recovery_handle_error(clp, ret);
2381 }
2382 return 0;
2383}
2384#else /* CONFIG_NFS_V4_1 */
2385static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
2386
2387static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2388{
2389 return 0;
2390}
2391#endif /* CONFIG_NFS_V4_1 */
2392
2393static void nfs4_state_manager(struct nfs_client *clp)
2394{
2395 int status = 0;
2396 const char *section = "", *section_sep = "";
2397
2398 /* Ensure exclusive access to NFSv4 state */
2399 do {
2400 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
2401 section = "purge state";
2402 status = nfs4_purge_lease(clp);
2403 if (status < 0)
2404 goto out_error;
2405 continue;
2406 }
2407
2408 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
2409 section = "lease expired";
2410 /* We're going to have to re-establish a clientid */
2411 status = nfs4_reclaim_lease(clp);
2412 if (status < 0)
2413 goto out_error;
2414 continue;
2415 }
2416
2417 /* Initialize or reset the session */
2418 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) {
2419 section = "reset session";
2420 status = nfs4_reset_session(clp);
2421 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
2422 continue;
2423 if (status < 0)
2424 goto out_error;
2425 }
2426
2427 /* Send BIND_CONN_TO_SESSION */
2428 if (test_and_clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
2429 &clp->cl_state)) {
2430 section = "bind conn to session";
2431 status = nfs4_bind_conn_to_session(clp);
2432 if (status < 0)
2433 goto out_error;
2434 continue;
2435 }
2436
2437 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
2438 section = "check lease";
2439 status = nfs4_check_lease(clp);
2440 if (status < 0)
2441 goto out_error;
2442 continue;
2443 }
2444
2445 if (test_and_clear_bit(NFS4CLNT_MOVED, &clp->cl_state)) {
2446 section = "migration";
2447 status = nfs4_handle_migration(clp);
2448 if (status < 0)
2449 goto out_error;
2450 }
2451
2452 if (test_and_clear_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state)) {
2453 section = "lease moved";
2454 status = nfs4_handle_lease_moved(clp);
2455 if (status < 0)
2456 goto out_error;
2457 }
2458
2459 /* First recover reboot state... */
2460 if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
2461 section = "reclaim reboot";
2462 status = nfs4_do_reclaim(clp,
2463 clp->cl_mvops->reboot_recovery_ops);
2464 if (status == -EAGAIN)
2465 continue;
2466 if (status < 0)
2467 goto out_error;
2468 nfs4_state_end_reclaim_reboot(clp);
2469 }
2470
2471 /* Detect expired delegations... */
2472 if (test_and_clear_bit(NFS4CLNT_DELEGATION_EXPIRED, &clp->cl_state)) {
2473 section = "detect expired delegations";
2474 nfs_reap_expired_delegations(clp);
2475 continue;
2476 }
2477
2478 /* Now recover expired state... */
2479 if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
2480 section = "reclaim nograce";
2481 status = nfs4_do_reclaim(clp,
2482 clp->cl_mvops->nograce_recovery_ops);
2483 if (status == -EAGAIN)
2484 continue;
2485 if (status < 0)
2486 goto out_error;
2487 }
2488
2489 nfs4_end_drain_session(clp);
2490 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
2491 nfs_client_return_marked_delegations(clp);
2492 continue;
2493 }
2494
2495 nfs4_clear_state_manager_bit(clp);
2496 /* Did we race with an attempt to give us more work? */
2497 if (clp->cl_state == 0)
2498 break;
2499 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
2500 break;
2501 } while (atomic_read(&clp->cl_count) > 1);
2502 return;
2503out_error:
2504 if (strlen(section))
2505 section_sep = ": ";
2506 pr_warn_ratelimited("NFS: state manager%s%s failed on NFSv4 server %s"
2507 " with error %d\n", section_sep, section,
2508 clp->cl_hostname, -status);
2509 ssleep(1);
2510 nfs4_end_drain_session(clp);
2511 nfs4_clear_state_manager_bit(clp);
2512}
2513
2514static int nfs4_run_state_manager(void *ptr)
2515{
2516 struct nfs_client *clp = ptr;
2517
2518 allow_signal(SIGKILL);
2519 nfs4_state_manager(clp);
2520 nfs_put_client(clp);
2521 module_put_and_exit(0);
2522 return 0;
2523}
2524
2525/*
2526 * Local variables:
2527 * c-basic-offset: 8
2528 * End:
2529 */