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NFSv4.1: Cleanup - move nfs4_has_session tests out of state manager loop
[deliverable/linux.git] / fs / nfs / nfs4state.c
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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/nfs_idmap.h>
46#include <linux/kthread.h>
47#include <linux/module.h>
48#include <linux/random.h>
49#include <linux/ratelimit.h>
50#include <linux/workqueue.h>
51#include <linux/bitops.h>
52#include <linux/jiffies.h>
53
54#include "nfs4_fs.h"
55#include "callback.h"
56#include "delegation.h"
57#include "internal.h"
58#include "pnfs.h"
59
60#define NFSDBG_FACILITY NFSDBG_STATE
61
62#define OPENOWNER_POOL_SIZE 8
63
64const nfs4_stateid zero_stateid;
65
66static LIST_HEAD(nfs4_clientid_list);
67
68int nfs4_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
69{
70 struct nfs4_setclientid_res clid = {
71 .clientid = clp->cl_clientid,
72 .confirm = clp->cl_confirm,
73 };
74 unsigned short port;
75 int status;
76
77 if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
78 goto do_confirm;
79 port = nfs_callback_tcpport;
80 if (clp->cl_addr.ss_family == AF_INET6)
81 port = nfs_callback_tcpport6;
82
83 status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
84 if (status != 0)
85 goto out;
86 clp->cl_clientid = clid.clientid;
87 clp->cl_confirm = clid.confirm;
88 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
89do_confirm:
90 status = nfs4_proc_setclientid_confirm(clp, &clid, cred);
91 if (status != 0)
92 goto out;
93 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
94 nfs4_schedule_state_renewal(clp);
95out:
96 return status;
97}
98
99struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp)
100{
101 struct rpc_cred *cred = NULL;
102
103 if (clp->cl_machine_cred != NULL)
104 cred = get_rpccred(clp->cl_machine_cred);
105 return cred;
106}
107
108static void nfs4_clear_machine_cred(struct nfs_client *clp)
109{
110 struct rpc_cred *cred;
111
112 spin_lock(&clp->cl_lock);
113 cred = clp->cl_machine_cred;
114 clp->cl_machine_cred = NULL;
115 spin_unlock(&clp->cl_lock);
116 if (cred != NULL)
117 put_rpccred(cred);
118}
119
120static struct rpc_cred *
121nfs4_get_renew_cred_server_locked(struct nfs_server *server)
122{
123 struct rpc_cred *cred = NULL;
124 struct nfs4_state_owner *sp;
125 struct rb_node *pos;
126
127 for (pos = rb_first(&server->state_owners);
128 pos != NULL;
129 pos = rb_next(pos)) {
130 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
131 if (list_empty(&sp->so_states))
132 continue;
133 cred = get_rpccred(sp->so_cred);
134 break;
135 }
136 return cred;
137}
138
139/**
140 * nfs4_get_renew_cred_locked - Acquire credential for a renew operation
141 * @clp: client state handle
142 *
143 * Returns an rpc_cred with reference count bumped, or NULL.
144 * Caller must hold clp->cl_lock.
145 */
146struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp)
147{
148 struct rpc_cred *cred = NULL;
149 struct nfs_server *server;
150
151 /* Use machine credentials if available */
152 cred = nfs4_get_machine_cred_locked(clp);
153 if (cred != NULL)
154 goto out;
155
156 rcu_read_lock();
157 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
158 cred = nfs4_get_renew_cred_server_locked(server);
159 if (cred != NULL)
160 break;
161 }
162 rcu_read_unlock();
163
164out:
165 return cred;
166}
167
168#if defined(CONFIG_NFS_V4_1)
169
170static int nfs41_setup_state_renewal(struct nfs_client *clp)
171{
172 int status;
173 struct nfs_fsinfo fsinfo;
174
175 if (!test_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state)) {
176 nfs4_schedule_state_renewal(clp);
177 return 0;
178 }
179
180 status = nfs4_proc_get_lease_time(clp, &fsinfo);
181 if (status == 0) {
182 /* Update lease time and schedule renewal */
183 spin_lock(&clp->cl_lock);
184 clp->cl_lease_time = fsinfo.lease_time * HZ;
185 clp->cl_last_renewal = jiffies;
186 spin_unlock(&clp->cl_lock);
187
188 nfs4_schedule_state_renewal(clp);
189 }
190
191 return status;
192}
193
194/*
195 * Back channel returns NFS4ERR_DELAY for new requests when
196 * NFS4_SESSION_DRAINING is set so there is no work to be done when draining
197 * is ended.
198 */
199static void nfs4_end_drain_session(struct nfs_client *clp)
200{
201 struct nfs4_session *ses = clp->cl_session;
202 struct nfs4_slot_table *tbl;
203 int max_slots;
204
205 if (ses == NULL)
206 return;
207 tbl = &ses->fc_slot_table;
208 if (test_and_clear_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
209 spin_lock(&tbl->slot_tbl_lock);
210 max_slots = tbl->max_slots;
211 while (max_slots--) {
212 if (rpc_wake_up_first(&tbl->slot_tbl_waitq,
213 nfs4_set_task_privileged,
214 NULL) == NULL)
215 break;
216 }
217 spin_unlock(&tbl->slot_tbl_lock);
218 }
219}
220
221static int nfs4_wait_on_slot_tbl(struct nfs4_slot_table *tbl)
222{
223 spin_lock(&tbl->slot_tbl_lock);
224 if (tbl->highest_used_slotid != NFS4_NO_SLOT) {
225 INIT_COMPLETION(tbl->complete);
226 spin_unlock(&tbl->slot_tbl_lock);
227 return wait_for_completion_interruptible(&tbl->complete);
228 }
229 spin_unlock(&tbl->slot_tbl_lock);
230 return 0;
231}
232
233static int nfs4_begin_drain_session(struct nfs_client *clp)
234{
235 struct nfs4_session *ses = clp->cl_session;
236 int ret = 0;
237
238 set_bit(NFS4_SESSION_DRAINING, &ses->session_state);
239 /* back channel */
240 ret = nfs4_wait_on_slot_tbl(&ses->bc_slot_table);
241 if (ret)
242 return ret;
243 /* fore channel */
244 return nfs4_wait_on_slot_tbl(&ses->fc_slot_table);
245}
246
247static void nfs41_finish_session_reset(struct nfs_client *clp)
248{
249 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
250 clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
251 /* create_session negotiated new slot table */
252 clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state);
253 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
254 nfs41_setup_state_renewal(clp);
255}
256
257int nfs41_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
258{
259 int status;
260
261 if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
262 goto do_confirm;
263 nfs4_begin_drain_session(clp);
264 status = nfs4_proc_exchange_id(clp, cred);
265 if (status != 0)
266 goto out;
267 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
268do_confirm:
269 status = nfs4_proc_create_session(clp, cred);
270 if (status != 0)
271 goto out;
272 nfs41_finish_session_reset(clp);
273 nfs_mark_client_ready(clp, NFS_CS_READY);
274out:
275 return status;
276}
277
278struct rpc_cred *nfs4_get_exchange_id_cred(struct nfs_client *clp)
279{
280 struct rpc_cred *cred;
281
282 spin_lock(&clp->cl_lock);
283 cred = nfs4_get_machine_cred_locked(clp);
284 spin_unlock(&clp->cl_lock);
285 return cred;
286}
287
288#endif /* CONFIG_NFS_V4_1 */
289
290static struct rpc_cred *
291nfs4_get_setclientid_cred_server(struct nfs_server *server)
292{
293 struct nfs_client *clp = server->nfs_client;
294 struct rpc_cred *cred = NULL;
295 struct nfs4_state_owner *sp;
296 struct rb_node *pos;
297
298 spin_lock(&clp->cl_lock);
299 pos = rb_first(&server->state_owners);
300 if (pos != NULL) {
301 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
302 cred = get_rpccred(sp->so_cred);
303 }
304 spin_unlock(&clp->cl_lock);
305 return cred;
306}
307
308/**
309 * nfs4_get_setclientid_cred - Acquire credential for a setclientid operation
310 * @clp: client state handle
311 *
312 * Returns an rpc_cred with reference count bumped, or NULL.
313 */
314struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp)
315{
316 struct nfs_server *server;
317 struct rpc_cred *cred;
318
319 spin_lock(&clp->cl_lock);
320 cred = nfs4_get_machine_cred_locked(clp);
321 spin_unlock(&clp->cl_lock);
322 if (cred != NULL)
323 goto out;
324
325 rcu_read_lock();
326 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
327 cred = nfs4_get_setclientid_cred_server(server);
328 if (cred != NULL)
329 break;
330 }
331 rcu_read_unlock();
332
333out:
334 return cred;
335}
336
337static struct nfs4_state_owner *
338nfs4_find_state_owner_locked(struct nfs_server *server, struct rpc_cred *cred)
339{
340 struct rb_node **p = &server->state_owners.rb_node,
341 *parent = NULL;
342 struct nfs4_state_owner *sp;
343
344 while (*p != NULL) {
345 parent = *p;
346 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
347
348 if (cred < sp->so_cred)
349 p = &parent->rb_left;
350 else if (cred > sp->so_cred)
351 p = &parent->rb_right;
352 else {
353 if (!list_empty(&sp->so_lru))
354 list_del_init(&sp->so_lru);
355 atomic_inc(&sp->so_count);
356 return sp;
357 }
358 }
359 return NULL;
360}
361
362static struct nfs4_state_owner *
363nfs4_insert_state_owner_locked(struct nfs4_state_owner *new)
364{
365 struct nfs_server *server = new->so_server;
366 struct rb_node **p = &server->state_owners.rb_node,
367 *parent = NULL;
368 struct nfs4_state_owner *sp;
369 int err;
370
371 while (*p != NULL) {
372 parent = *p;
373 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
374
375 if (new->so_cred < sp->so_cred)
376 p = &parent->rb_left;
377 else if (new->so_cred > sp->so_cred)
378 p = &parent->rb_right;
379 else {
380 if (!list_empty(&sp->so_lru))
381 list_del_init(&sp->so_lru);
382 atomic_inc(&sp->so_count);
383 return sp;
384 }
385 }
386 err = ida_get_new(&server->openowner_id, &new->so_seqid.owner_id);
387 if (err)
388 return ERR_PTR(err);
389 rb_link_node(&new->so_server_node, parent, p);
390 rb_insert_color(&new->so_server_node, &server->state_owners);
391 return new;
392}
393
394static void
395nfs4_remove_state_owner_locked(struct nfs4_state_owner *sp)
396{
397 struct nfs_server *server = sp->so_server;
398
399 if (!RB_EMPTY_NODE(&sp->so_server_node))
400 rb_erase(&sp->so_server_node, &server->state_owners);
401 ida_remove(&server->openowner_id, sp->so_seqid.owner_id);
402}
403
404static void
405nfs4_init_seqid_counter(struct nfs_seqid_counter *sc)
406{
407 sc->create_time = ktime_get();
408 sc->flags = 0;
409 sc->counter = 0;
410 spin_lock_init(&sc->lock);
411 INIT_LIST_HEAD(&sc->list);
412 rpc_init_wait_queue(&sc->wait, "Seqid_waitqueue");
413}
414
415static void
416nfs4_destroy_seqid_counter(struct nfs_seqid_counter *sc)
417{
418 rpc_destroy_wait_queue(&sc->wait);
419}
420
421/*
422 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
423 * create a new state_owner.
424 *
425 */
426static struct nfs4_state_owner *
427nfs4_alloc_state_owner(struct nfs_server *server,
428 struct rpc_cred *cred,
429 gfp_t gfp_flags)
430{
431 struct nfs4_state_owner *sp;
432
433 sp = kzalloc(sizeof(*sp), gfp_flags);
434 if (!sp)
435 return NULL;
436 sp->so_server = server;
437 sp->so_cred = get_rpccred(cred);
438 spin_lock_init(&sp->so_lock);
439 INIT_LIST_HEAD(&sp->so_states);
440 nfs4_init_seqid_counter(&sp->so_seqid);
441 atomic_set(&sp->so_count, 1);
442 INIT_LIST_HEAD(&sp->so_lru);
443 return sp;
444}
445
446static void
447nfs4_drop_state_owner(struct nfs4_state_owner *sp)
448{
449 struct rb_node *rb_node = &sp->so_server_node;
450
451 if (!RB_EMPTY_NODE(rb_node)) {
452 struct nfs_server *server = sp->so_server;
453 struct nfs_client *clp = server->nfs_client;
454
455 spin_lock(&clp->cl_lock);
456 if (!RB_EMPTY_NODE(rb_node)) {
457 rb_erase(rb_node, &server->state_owners);
458 RB_CLEAR_NODE(rb_node);
459 }
460 spin_unlock(&clp->cl_lock);
461 }
462}
463
464static void nfs4_free_state_owner(struct nfs4_state_owner *sp)
465{
466 nfs4_destroy_seqid_counter(&sp->so_seqid);
467 put_rpccred(sp->so_cred);
468 kfree(sp);
469}
470
471static void nfs4_gc_state_owners(struct nfs_server *server)
472{
473 struct nfs_client *clp = server->nfs_client;
474 struct nfs4_state_owner *sp, *tmp;
475 unsigned long time_min, time_max;
476 LIST_HEAD(doomed);
477
478 spin_lock(&clp->cl_lock);
479 time_max = jiffies;
480 time_min = (long)time_max - (long)clp->cl_lease_time;
481 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
482 /* NB: LRU is sorted so that oldest is at the head */
483 if (time_in_range(sp->so_expires, time_min, time_max))
484 break;
485 list_move(&sp->so_lru, &doomed);
486 nfs4_remove_state_owner_locked(sp);
487 }
488 spin_unlock(&clp->cl_lock);
489
490 list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
491 list_del(&sp->so_lru);
492 nfs4_free_state_owner(sp);
493 }
494}
495
496/**
497 * nfs4_get_state_owner - Look up a state owner given a credential
498 * @server: nfs_server to search
499 * @cred: RPC credential to match
500 *
501 * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL.
502 */
503struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server,
504 struct rpc_cred *cred,
505 gfp_t gfp_flags)
506{
507 struct nfs_client *clp = server->nfs_client;
508 struct nfs4_state_owner *sp, *new;
509
510 spin_lock(&clp->cl_lock);
511 sp = nfs4_find_state_owner_locked(server, cred);
512 spin_unlock(&clp->cl_lock);
513 if (sp != NULL)
514 goto out;
515 new = nfs4_alloc_state_owner(server, cred, gfp_flags);
516 if (new == NULL)
517 goto out;
518 do {
519 if (ida_pre_get(&server->openowner_id, gfp_flags) == 0)
520 break;
521 spin_lock(&clp->cl_lock);
522 sp = nfs4_insert_state_owner_locked(new);
523 spin_unlock(&clp->cl_lock);
524 } while (sp == ERR_PTR(-EAGAIN));
525 if (sp != new)
526 nfs4_free_state_owner(new);
527out:
528 nfs4_gc_state_owners(server);
529 return sp;
530}
531
532/**
533 * nfs4_put_state_owner - Release a nfs4_state_owner
534 * @sp: state owner data to release
535 *
536 * Note that we keep released state owners on an LRU
537 * list.
538 * This caches valid state owners so that they can be
539 * reused, to avoid the OPEN_CONFIRM on minor version 0.
540 * It also pins the uniquifier of dropped state owners for
541 * a while, to ensure that those state owner names are
542 * never reused.
543 */
544void nfs4_put_state_owner(struct nfs4_state_owner *sp)
545{
546 struct nfs_server *server = sp->so_server;
547 struct nfs_client *clp = server->nfs_client;
548
549 if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
550 return;
551
552 sp->so_expires = jiffies;
553 list_add_tail(&sp->so_lru, &server->state_owners_lru);
554 spin_unlock(&clp->cl_lock);
555}
556
557/**
558 * nfs4_purge_state_owners - Release all cached state owners
559 * @server: nfs_server with cached state owners to release
560 *
561 * Called at umount time. Remaining state owners will be on
562 * the LRU with ref count of zero.
563 */
564void nfs4_purge_state_owners(struct nfs_server *server)
565{
566 struct nfs_client *clp = server->nfs_client;
567 struct nfs4_state_owner *sp, *tmp;
568 LIST_HEAD(doomed);
569
570 spin_lock(&clp->cl_lock);
571 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
572 list_move(&sp->so_lru, &doomed);
573 nfs4_remove_state_owner_locked(sp);
574 }
575 spin_unlock(&clp->cl_lock);
576
577 list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
578 list_del(&sp->so_lru);
579 nfs4_free_state_owner(sp);
580 }
581}
582
583static struct nfs4_state *
584nfs4_alloc_open_state(void)
585{
586 struct nfs4_state *state;
587
588 state = kzalloc(sizeof(*state), GFP_NOFS);
589 if (!state)
590 return NULL;
591 atomic_set(&state->count, 1);
592 INIT_LIST_HEAD(&state->lock_states);
593 spin_lock_init(&state->state_lock);
594 seqlock_init(&state->seqlock);
595 return state;
596}
597
598void
599nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode)
600{
601 if (state->state == fmode)
602 return;
603 /* NB! List reordering - see the reclaim code for why. */
604 if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) {
605 if (fmode & FMODE_WRITE)
606 list_move(&state->open_states, &state->owner->so_states);
607 else
608 list_move_tail(&state->open_states, &state->owner->so_states);
609 }
610 state->state = fmode;
611}
612
613static struct nfs4_state *
614__nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner)
615{
616 struct nfs_inode *nfsi = NFS_I(inode);
617 struct nfs4_state *state;
618
619 list_for_each_entry(state, &nfsi->open_states, inode_states) {
620 if (state->owner != owner)
621 continue;
622 if (atomic_inc_not_zero(&state->count))
623 return state;
624 }
625 return NULL;
626}
627
628static void
629nfs4_free_open_state(struct nfs4_state *state)
630{
631 kfree(state);
632}
633
634struct nfs4_state *
635nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
636{
637 struct nfs4_state *state, *new;
638 struct nfs_inode *nfsi = NFS_I(inode);
639
640 spin_lock(&inode->i_lock);
641 state = __nfs4_find_state_byowner(inode, owner);
642 spin_unlock(&inode->i_lock);
643 if (state)
644 goto out;
645 new = nfs4_alloc_open_state();
646 spin_lock(&owner->so_lock);
647 spin_lock(&inode->i_lock);
648 state = __nfs4_find_state_byowner(inode, owner);
649 if (state == NULL && new != NULL) {
650 state = new;
651 state->owner = owner;
652 atomic_inc(&owner->so_count);
653 list_add(&state->inode_states, &nfsi->open_states);
654 ihold(inode);
655 state->inode = inode;
656 spin_unlock(&inode->i_lock);
657 /* Note: The reclaim code dictates that we add stateless
658 * and read-only stateids to the end of the list */
659 list_add_tail(&state->open_states, &owner->so_states);
660 spin_unlock(&owner->so_lock);
661 } else {
662 spin_unlock(&inode->i_lock);
663 spin_unlock(&owner->so_lock);
664 if (new)
665 nfs4_free_open_state(new);
666 }
667out:
668 return state;
669}
670
671void nfs4_put_open_state(struct nfs4_state *state)
672{
673 struct inode *inode = state->inode;
674 struct nfs4_state_owner *owner = state->owner;
675
676 if (!atomic_dec_and_lock(&state->count, &owner->so_lock))
677 return;
678 spin_lock(&inode->i_lock);
679 list_del(&state->inode_states);
680 list_del(&state->open_states);
681 spin_unlock(&inode->i_lock);
682 spin_unlock(&owner->so_lock);
683 iput(inode);
684 nfs4_free_open_state(state);
685 nfs4_put_state_owner(owner);
686}
687
688/*
689 * Close the current file.
690 */
691static void __nfs4_close(struct nfs4_state *state,
692 fmode_t fmode, gfp_t gfp_mask, int wait)
693{
694 struct nfs4_state_owner *owner = state->owner;
695 int call_close = 0;
696 fmode_t newstate;
697
698 atomic_inc(&owner->so_count);
699 /* Protect against nfs4_find_state() */
700 spin_lock(&owner->so_lock);
701 switch (fmode & (FMODE_READ | FMODE_WRITE)) {
702 case FMODE_READ:
703 state->n_rdonly--;
704 break;
705 case FMODE_WRITE:
706 state->n_wronly--;
707 break;
708 case FMODE_READ|FMODE_WRITE:
709 state->n_rdwr--;
710 }
711 newstate = FMODE_READ|FMODE_WRITE;
712 if (state->n_rdwr == 0) {
713 if (state->n_rdonly == 0) {
714 newstate &= ~FMODE_READ;
715 call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
716 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
717 }
718 if (state->n_wronly == 0) {
719 newstate &= ~FMODE_WRITE;
720 call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
721 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
722 }
723 if (newstate == 0)
724 clear_bit(NFS_DELEGATED_STATE, &state->flags);
725 }
726 nfs4_state_set_mode_locked(state, newstate);
727 spin_unlock(&owner->so_lock);
728
729 if (!call_close) {
730 nfs4_put_open_state(state);
731 nfs4_put_state_owner(owner);
732 } else {
733 bool roc = pnfs_roc(state->inode);
734
735 nfs4_do_close(state, gfp_mask, wait, roc);
736 }
737}
738
739void nfs4_close_state(struct nfs4_state *state, fmode_t fmode)
740{
741 __nfs4_close(state, fmode, GFP_NOFS, 0);
742}
743
744void nfs4_close_sync(struct nfs4_state *state, fmode_t fmode)
745{
746 __nfs4_close(state, fmode, GFP_KERNEL, 1);
747}
748
749/*
750 * Search the state->lock_states for an existing lock_owner
751 * that is compatible with current->files
752 */
753static struct nfs4_lock_state *
754__nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid, unsigned int type)
755{
756 struct nfs4_lock_state *pos;
757 list_for_each_entry(pos, &state->lock_states, ls_locks) {
758 if (type != NFS4_ANY_LOCK_TYPE && pos->ls_owner.lo_type != type)
759 continue;
760 switch (pos->ls_owner.lo_type) {
761 case NFS4_POSIX_LOCK_TYPE:
762 if (pos->ls_owner.lo_u.posix_owner != fl_owner)
763 continue;
764 break;
765 case NFS4_FLOCK_LOCK_TYPE:
766 if (pos->ls_owner.lo_u.flock_owner != fl_pid)
767 continue;
768 }
769 atomic_inc(&pos->ls_count);
770 return pos;
771 }
772 return NULL;
773}
774
775/*
776 * Return a compatible lock_state. If no initialized lock_state structure
777 * exists, return an uninitialized one.
778 *
779 */
780static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid, unsigned int type)
781{
782 struct nfs4_lock_state *lsp;
783 struct nfs_server *server = state->owner->so_server;
784
785 lsp = kzalloc(sizeof(*lsp), GFP_NOFS);
786 if (lsp == NULL)
787 return NULL;
788 nfs4_init_seqid_counter(&lsp->ls_seqid);
789 atomic_set(&lsp->ls_count, 1);
790 lsp->ls_state = state;
791 lsp->ls_owner.lo_type = type;
792 switch (lsp->ls_owner.lo_type) {
793 case NFS4_FLOCK_LOCK_TYPE:
794 lsp->ls_owner.lo_u.flock_owner = fl_pid;
795 break;
796 case NFS4_POSIX_LOCK_TYPE:
797 lsp->ls_owner.lo_u.posix_owner = fl_owner;
798 break;
799 default:
800 goto out_free;
801 }
802 lsp->ls_seqid.owner_id = ida_simple_get(&server->lockowner_id, 0, 0, GFP_NOFS);
803 if (lsp->ls_seqid.owner_id < 0)
804 goto out_free;
805 INIT_LIST_HEAD(&lsp->ls_locks);
806 return lsp;
807out_free:
808 kfree(lsp);
809 return NULL;
810}
811
812void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
813{
814 ida_simple_remove(&server->lockowner_id, lsp->ls_seqid.owner_id);
815 nfs4_destroy_seqid_counter(&lsp->ls_seqid);
816 kfree(lsp);
817}
818
819/*
820 * Return a compatible lock_state. If no initialized lock_state structure
821 * exists, return an uninitialized one.
822 *
823 */
824static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner, pid_t pid, unsigned int type)
825{
826 struct nfs4_lock_state *lsp, *new = NULL;
827
828 for(;;) {
829 spin_lock(&state->state_lock);
830 lsp = __nfs4_find_lock_state(state, owner, pid, type);
831 if (lsp != NULL)
832 break;
833 if (new != NULL) {
834 list_add(&new->ls_locks, &state->lock_states);
835 set_bit(LK_STATE_IN_USE, &state->flags);
836 lsp = new;
837 new = NULL;
838 break;
839 }
840 spin_unlock(&state->state_lock);
841 new = nfs4_alloc_lock_state(state, owner, pid, type);
842 if (new == NULL)
843 return NULL;
844 }
845 spin_unlock(&state->state_lock);
846 if (new != NULL)
847 nfs4_free_lock_state(state->owner->so_server, new);
848 return lsp;
849}
850
851/*
852 * Release reference to lock_state, and free it if we see that
853 * it is no longer in use
854 */
855void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
856{
857 struct nfs4_state *state;
858
859 if (lsp == NULL)
860 return;
861 state = lsp->ls_state;
862 if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock))
863 return;
864 list_del(&lsp->ls_locks);
865 if (list_empty(&state->lock_states))
866 clear_bit(LK_STATE_IN_USE, &state->flags);
867 spin_unlock(&state->state_lock);
868 if (lsp->ls_flags & NFS_LOCK_INITIALIZED) {
869 if (nfs4_release_lockowner(lsp) == 0)
870 return;
871 }
872 nfs4_free_lock_state(lsp->ls_state->owner->so_server, lsp);
873}
874
875static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
876{
877 struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
878
879 dst->fl_u.nfs4_fl.owner = lsp;
880 atomic_inc(&lsp->ls_count);
881}
882
883static void nfs4_fl_release_lock(struct file_lock *fl)
884{
885 nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
886}
887
888static const struct file_lock_operations nfs4_fl_lock_ops = {
889 .fl_copy_lock = nfs4_fl_copy_lock,
890 .fl_release_private = nfs4_fl_release_lock,
891};
892
893int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
894{
895 struct nfs4_lock_state *lsp;
896
897 if (fl->fl_ops != NULL)
898 return 0;
899 if (fl->fl_flags & FL_POSIX)
900 lsp = nfs4_get_lock_state(state, fl->fl_owner, 0, NFS4_POSIX_LOCK_TYPE);
901 else if (fl->fl_flags & FL_FLOCK)
902 lsp = nfs4_get_lock_state(state, NULL, fl->fl_pid,
903 NFS4_FLOCK_LOCK_TYPE);
904 else
905 return -EINVAL;
906 if (lsp == NULL)
907 return -ENOMEM;
908 fl->fl_u.nfs4_fl.owner = lsp;
909 fl->fl_ops = &nfs4_fl_lock_ops;
910 return 0;
911}
912
913static bool nfs4_copy_lock_stateid(nfs4_stateid *dst, struct nfs4_state *state,
914 fl_owner_t fl_owner, pid_t fl_pid)
915{
916 struct nfs4_lock_state *lsp;
917 bool ret = false;
918
919 if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
920 goto out;
921
922 spin_lock(&state->state_lock);
923 lsp = __nfs4_find_lock_state(state, fl_owner, fl_pid, NFS4_ANY_LOCK_TYPE);
924 if (lsp != NULL && (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0) {
925 nfs4_stateid_copy(dst, &lsp->ls_stateid);
926 ret = true;
927 }
928 spin_unlock(&state->state_lock);
929 nfs4_put_lock_state(lsp);
930out:
931 return ret;
932}
933
934static void nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state)
935{
936 int seq;
937
938 do {
939 seq = read_seqbegin(&state->seqlock);
940 nfs4_stateid_copy(dst, &state->stateid);
941 } while (read_seqretry(&state->seqlock, seq));
942}
943
944/*
945 * Byte-range lock aware utility to initialize the stateid of read/write
946 * requests.
947 */
948void nfs4_select_rw_stateid(nfs4_stateid *dst, struct nfs4_state *state,
949 fmode_t fmode, fl_owner_t fl_owner, pid_t fl_pid)
950{
951 if (nfs4_copy_delegation_stateid(dst, state->inode, fmode))
952 return;
953 if (nfs4_copy_lock_stateid(dst, state, fl_owner, fl_pid))
954 return;
955 nfs4_copy_open_stateid(dst, state);
956}
957
958struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask)
959{
960 struct nfs_seqid *new;
961
962 new = kmalloc(sizeof(*new), gfp_mask);
963 if (new != NULL) {
964 new->sequence = counter;
965 INIT_LIST_HEAD(&new->list);
966 new->task = NULL;
967 }
968 return new;
969}
970
971void nfs_release_seqid(struct nfs_seqid *seqid)
972{
973 struct nfs_seqid_counter *sequence;
974
975 if (list_empty(&seqid->list))
976 return;
977 sequence = seqid->sequence;
978 spin_lock(&sequence->lock);
979 list_del_init(&seqid->list);
980 if (!list_empty(&sequence->list)) {
981 struct nfs_seqid *next;
982
983 next = list_first_entry(&sequence->list,
984 struct nfs_seqid, list);
985 rpc_wake_up_queued_task(&sequence->wait, next->task);
986 }
987 spin_unlock(&sequence->lock);
988}
989
990void nfs_free_seqid(struct nfs_seqid *seqid)
991{
992 nfs_release_seqid(seqid);
993 kfree(seqid);
994}
995
996/*
997 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
998 * failed with a seqid incrementing error -
999 * see comments nfs_fs.h:seqid_mutating_error()
1000 */
1001static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
1002{
1003 BUG_ON(list_first_entry(&seqid->sequence->list, struct nfs_seqid, list) != seqid);
1004 switch (status) {
1005 case 0:
1006 break;
1007 case -NFS4ERR_BAD_SEQID:
1008 if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
1009 return;
1010 pr_warn_ratelimited("NFS: v4 server returned a bad"
1011 " sequence-id error on an"
1012 " unconfirmed sequence %p!\n",
1013 seqid->sequence);
1014 case -NFS4ERR_STALE_CLIENTID:
1015 case -NFS4ERR_STALE_STATEID:
1016 case -NFS4ERR_BAD_STATEID:
1017 case -NFS4ERR_BADXDR:
1018 case -NFS4ERR_RESOURCE:
1019 case -NFS4ERR_NOFILEHANDLE:
1020 /* Non-seqid mutating errors */
1021 return;
1022 };
1023 /*
1024 * Note: no locking needed as we are guaranteed to be first
1025 * on the sequence list
1026 */
1027 seqid->sequence->counter++;
1028}
1029
1030void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
1031{
1032 struct nfs4_state_owner *sp = container_of(seqid->sequence,
1033 struct nfs4_state_owner, so_seqid);
1034 struct nfs_server *server = sp->so_server;
1035
1036 if (status == -NFS4ERR_BAD_SEQID)
1037 nfs4_drop_state_owner(sp);
1038 if (!nfs4_has_session(server->nfs_client))
1039 nfs_increment_seqid(status, seqid);
1040}
1041
1042/*
1043 * Increment the seqid if the LOCK/LOCKU succeeded, or
1044 * failed with a seqid incrementing error -
1045 * see comments nfs_fs.h:seqid_mutating_error()
1046 */
1047void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
1048{
1049 nfs_increment_seqid(status, seqid);
1050}
1051
1052int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
1053{
1054 struct nfs_seqid_counter *sequence = seqid->sequence;
1055 int status = 0;
1056
1057 spin_lock(&sequence->lock);
1058 seqid->task = task;
1059 if (list_empty(&seqid->list))
1060 list_add_tail(&seqid->list, &sequence->list);
1061 if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid)
1062 goto unlock;
1063 rpc_sleep_on(&sequence->wait, task, NULL);
1064 status = -EAGAIN;
1065unlock:
1066 spin_unlock(&sequence->lock);
1067 return status;
1068}
1069
1070static int nfs4_run_state_manager(void *);
1071
1072static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
1073{
1074 smp_mb__before_clear_bit();
1075 clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
1076 smp_mb__after_clear_bit();
1077 wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING);
1078 rpc_wake_up(&clp->cl_rpcwaitq);
1079}
1080
1081/*
1082 * Schedule the nfs_client asynchronous state management routine
1083 */
1084void nfs4_schedule_state_manager(struct nfs_client *clp)
1085{
1086 struct task_struct *task;
1087 char buf[INET6_ADDRSTRLEN + sizeof("-manager") + 1];
1088
1089 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1090 return;
1091 __module_get(THIS_MODULE);
1092 atomic_inc(&clp->cl_count);
1093
1094 /* The rcu_read_lock() is not strictly necessary, as the state
1095 * manager is the only thread that ever changes the rpc_xprt
1096 * after it's initialized. At this point, we're single threaded. */
1097 rcu_read_lock();
1098 snprintf(buf, sizeof(buf), "%s-manager",
1099 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
1100 rcu_read_unlock();
1101 task = kthread_run(nfs4_run_state_manager, clp, buf);
1102 if (IS_ERR(task)) {
1103 printk(KERN_ERR "%s: kthread_run: %ld\n",
1104 __func__, PTR_ERR(task));
1105 nfs4_clear_state_manager_bit(clp);
1106 nfs_put_client(clp);
1107 module_put(THIS_MODULE);
1108 }
1109}
1110
1111/*
1112 * Schedule a lease recovery attempt
1113 */
1114void nfs4_schedule_lease_recovery(struct nfs_client *clp)
1115{
1116 if (!clp)
1117 return;
1118 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1119 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1120 dprintk("%s: scheduling lease recovery for server %s\n", __func__,
1121 clp->cl_hostname);
1122 nfs4_schedule_state_manager(clp);
1123}
1124EXPORT_SYMBOL_GPL(nfs4_schedule_lease_recovery);
1125
1126/*
1127 * nfs40_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN
1128 * @clp: client to process
1129 *
1130 * Set the NFS4CLNT_LEASE_EXPIRED state in order to force a
1131 * resend of the SETCLIENTID and hence re-establish the
1132 * callback channel. Then return all existing delegations.
1133 */
1134static void nfs40_handle_cb_pathdown(struct nfs_client *clp)
1135{
1136 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1137 nfs_expire_all_delegations(clp);
1138 dprintk("%s: handling CB_PATHDOWN recovery for server %s\n", __func__,
1139 clp->cl_hostname);
1140}
1141
1142void nfs4_schedule_path_down_recovery(struct nfs_client *clp)
1143{
1144 nfs40_handle_cb_pathdown(clp);
1145 nfs4_schedule_state_manager(clp);
1146}
1147
1148static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
1149{
1150
1151 set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1152 /* Don't recover state that expired before the reboot */
1153 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) {
1154 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1155 return 0;
1156 }
1157 set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags);
1158 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1159 return 1;
1160}
1161
1162static int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
1163{
1164 set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
1165 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1166 set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags);
1167 set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
1168 return 1;
1169}
1170
1171void nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state)
1172{
1173 struct nfs_client *clp = server->nfs_client;
1174
1175 nfs4_state_mark_reclaim_nograce(clp, state);
1176 dprintk("%s: scheduling stateid recovery for server %s\n", __func__,
1177 clp->cl_hostname);
1178 nfs4_schedule_state_manager(clp);
1179}
1180EXPORT_SYMBOL_GPL(nfs4_schedule_stateid_recovery);
1181
1182void nfs_inode_find_state_and_recover(struct inode *inode,
1183 const nfs4_stateid *stateid)
1184{
1185 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
1186 struct nfs_inode *nfsi = NFS_I(inode);
1187 struct nfs_open_context *ctx;
1188 struct nfs4_state *state;
1189 bool found = false;
1190
1191 spin_lock(&inode->i_lock);
1192 list_for_each_entry(ctx, &nfsi->open_files, list) {
1193 state = ctx->state;
1194 if (state == NULL)
1195 continue;
1196 if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
1197 continue;
1198 if (!nfs4_stateid_match(&state->stateid, stateid))
1199 continue;
1200 nfs4_state_mark_reclaim_nograce(clp, state);
1201 found = true;
1202 }
1203 spin_unlock(&inode->i_lock);
1204 if (found)
1205 nfs4_schedule_state_manager(clp);
1206}
1207
1208
1209static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
1210{
1211 struct inode *inode = state->inode;
1212 struct nfs_inode *nfsi = NFS_I(inode);
1213 struct file_lock *fl;
1214 int status = 0;
1215
1216 if (inode->i_flock == NULL)
1217 return 0;
1218
1219 /* Guard against delegation returns and new lock/unlock calls */
1220 down_write(&nfsi->rwsem);
1221 /* Protect inode->i_flock using the BKL */
1222 lock_flocks();
1223 for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) {
1224 if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK)))
1225 continue;
1226 if (nfs_file_open_context(fl->fl_file)->state != state)
1227 continue;
1228 unlock_flocks();
1229 status = ops->recover_lock(state, fl);
1230 switch (status) {
1231 case 0:
1232 break;
1233 case -ESTALE:
1234 case -NFS4ERR_ADMIN_REVOKED:
1235 case -NFS4ERR_STALE_STATEID:
1236 case -NFS4ERR_BAD_STATEID:
1237 case -NFS4ERR_EXPIRED:
1238 case -NFS4ERR_NO_GRACE:
1239 case -NFS4ERR_STALE_CLIENTID:
1240 case -NFS4ERR_BADSESSION:
1241 case -NFS4ERR_BADSLOT:
1242 case -NFS4ERR_BAD_HIGH_SLOT:
1243 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1244 goto out;
1245 default:
1246 printk(KERN_ERR "NFS: %s: unhandled error %d. "
1247 "Zeroing state\n", __func__, status);
1248 case -ENOMEM:
1249 case -NFS4ERR_DENIED:
1250 case -NFS4ERR_RECLAIM_BAD:
1251 case -NFS4ERR_RECLAIM_CONFLICT:
1252 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1253 status = 0;
1254 }
1255 lock_flocks();
1256 }
1257 unlock_flocks();
1258out:
1259 up_write(&nfsi->rwsem);
1260 return status;
1261}
1262
1263static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops)
1264{
1265 struct nfs4_state *state;
1266 struct nfs4_lock_state *lock;
1267 int status = 0;
1268
1269 /* Note: we rely on the sp->so_states list being ordered
1270 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
1271 * states first.
1272 * This is needed to ensure that the server won't give us any
1273 * read delegations that we have to return if, say, we are
1274 * recovering after a network partition or a reboot from a
1275 * server that doesn't support a grace period.
1276 */
1277restart:
1278 spin_lock(&sp->so_lock);
1279 list_for_each_entry(state, &sp->so_states, open_states) {
1280 if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
1281 continue;
1282 if (state->state == 0)
1283 continue;
1284 atomic_inc(&state->count);
1285 spin_unlock(&sp->so_lock);
1286 status = ops->recover_open(sp, state);
1287 if (status >= 0) {
1288 status = nfs4_reclaim_locks(state, ops);
1289 if (status >= 0) {
1290 spin_lock(&state->state_lock);
1291 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1292 if (!(lock->ls_flags & NFS_LOCK_INITIALIZED))
1293 pr_warn_ratelimited("NFS: "
1294 "%s: Lock reclaim "
1295 "failed!\n", __func__);
1296 }
1297 spin_unlock(&state->state_lock);
1298 nfs4_put_open_state(state);
1299 goto restart;
1300 }
1301 }
1302 switch (status) {
1303 default:
1304 printk(KERN_ERR "NFS: %s: unhandled error %d. "
1305 "Zeroing state\n", __func__, status);
1306 case -ENOENT:
1307 case -ENOMEM:
1308 case -ESTALE:
1309 /*
1310 * Open state on this file cannot be recovered
1311 * All we can do is revert to using the zero stateid.
1312 */
1313 memset(&state->stateid, 0,
1314 sizeof(state->stateid));
1315 /* Mark the file as being 'closed' */
1316 state->state = 0;
1317 break;
1318 case -EKEYEXPIRED:
1319 /*
1320 * User RPCSEC_GSS context has expired.
1321 * We cannot recover this stateid now, so
1322 * skip it and allow recovery thread to
1323 * proceed.
1324 */
1325 break;
1326 case -NFS4ERR_ADMIN_REVOKED:
1327 case -NFS4ERR_STALE_STATEID:
1328 case -NFS4ERR_BAD_STATEID:
1329 case -NFS4ERR_RECLAIM_BAD:
1330 case -NFS4ERR_RECLAIM_CONFLICT:
1331 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1332 break;
1333 case -NFS4ERR_EXPIRED:
1334 case -NFS4ERR_NO_GRACE:
1335 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1336 case -NFS4ERR_STALE_CLIENTID:
1337 case -NFS4ERR_BADSESSION:
1338 case -NFS4ERR_BADSLOT:
1339 case -NFS4ERR_BAD_HIGH_SLOT:
1340 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1341 goto out_err;
1342 }
1343 nfs4_put_open_state(state);
1344 goto restart;
1345 }
1346 spin_unlock(&sp->so_lock);
1347 return 0;
1348out_err:
1349 nfs4_put_open_state(state);
1350 return status;
1351}
1352
1353static void nfs4_clear_open_state(struct nfs4_state *state)
1354{
1355 struct nfs4_lock_state *lock;
1356
1357 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1358 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1359 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1360 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1361 spin_lock(&state->state_lock);
1362 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1363 lock->ls_seqid.flags = 0;
1364 lock->ls_flags &= ~NFS_LOCK_INITIALIZED;
1365 }
1366 spin_unlock(&state->state_lock);
1367}
1368
1369static void nfs4_reset_seqids(struct nfs_server *server,
1370 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1371{
1372 struct nfs_client *clp = server->nfs_client;
1373 struct nfs4_state_owner *sp;
1374 struct rb_node *pos;
1375 struct nfs4_state *state;
1376
1377 spin_lock(&clp->cl_lock);
1378 for (pos = rb_first(&server->state_owners);
1379 pos != NULL;
1380 pos = rb_next(pos)) {
1381 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1382 sp->so_seqid.flags = 0;
1383 spin_lock(&sp->so_lock);
1384 list_for_each_entry(state, &sp->so_states, open_states) {
1385 if (mark_reclaim(clp, state))
1386 nfs4_clear_open_state(state);
1387 }
1388 spin_unlock(&sp->so_lock);
1389 }
1390 spin_unlock(&clp->cl_lock);
1391}
1392
1393static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp,
1394 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1395{
1396 struct nfs_server *server;
1397
1398 rcu_read_lock();
1399 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1400 nfs4_reset_seqids(server, mark_reclaim);
1401 rcu_read_unlock();
1402}
1403
1404static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
1405{
1406 /* Mark all delegations for reclaim */
1407 nfs_delegation_mark_reclaim(clp);
1408 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot);
1409}
1410
1411static void nfs4_reclaim_complete(struct nfs_client *clp,
1412 const struct nfs4_state_recovery_ops *ops)
1413{
1414 /* Notify the server we're done reclaiming our state */
1415 if (ops->reclaim_complete)
1416 (void)ops->reclaim_complete(clp);
1417}
1418
1419static void nfs4_clear_reclaim_server(struct nfs_server *server)
1420{
1421 struct nfs_client *clp = server->nfs_client;
1422 struct nfs4_state_owner *sp;
1423 struct rb_node *pos;
1424 struct nfs4_state *state;
1425
1426 spin_lock(&clp->cl_lock);
1427 for (pos = rb_first(&server->state_owners);
1428 pos != NULL;
1429 pos = rb_next(pos)) {
1430 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1431 spin_lock(&sp->so_lock);
1432 list_for_each_entry(state, &sp->so_states, open_states) {
1433 if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT,
1434 &state->flags))
1435 continue;
1436 nfs4_state_mark_reclaim_nograce(clp, state);
1437 }
1438 spin_unlock(&sp->so_lock);
1439 }
1440 spin_unlock(&clp->cl_lock);
1441}
1442
1443static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp)
1444{
1445 struct nfs_server *server;
1446
1447 if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1448 return 0;
1449
1450 rcu_read_lock();
1451 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1452 nfs4_clear_reclaim_server(server);
1453 rcu_read_unlock();
1454
1455 nfs_delegation_reap_unclaimed(clp);
1456 return 1;
1457}
1458
1459static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
1460{
1461 if (!nfs4_state_clear_reclaim_reboot(clp))
1462 return;
1463 nfs4_reclaim_complete(clp, clp->cl_mvops->reboot_recovery_ops);
1464}
1465
1466static void nfs_delegation_clear_all(struct nfs_client *clp)
1467{
1468 nfs_delegation_mark_reclaim(clp);
1469 nfs_delegation_reap_unclaimed(clp);
1470}
1471
1472static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
1473{
1474 nfs_delegation_clear_all(clp);
1475 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
1476}
1477
1478static void nfs4_warn_keyexpired(const char *s)
1479{
1480 printk_ratelimited(KERN_WARNING "Error: state manager"
1481 " encountered RPCSEC_GSS session"
1482 " expired against NFSv4 server %s.\n",
1483 s);
1484}
1485
1486static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
1487{
1488 switch (error) {
1489 case 0:
1490 break;
1491 case -NFS4ERR_CB_PATH_DOWN:
1492 nfs40_handle_cb_pathdown(clp);
1493 break;
1494 case -NFS4ERR_NO_GRACE:
1495 nfs4_state_end_reclaim_reboot(clp);
1496 break;
1497 case -NFS4ERR_STALE_CLIENTID:
1498 case -NFS4ERR_LEASE_MOVED:
1499 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1500 nfs4_state_clear_reclaim_reboot(clp);
1501 nfs4_state_start_reclaim_reboot(clp);
1502 break;
1503 case -NFS4ERR_EXPIRED:
1504 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1505 nfs4_state_start_reclaim_nograce(clp);
1506 break;
1507 case -NFS4ERR_BADSESSION:
1508 case -NFS4ERR_BADSLOT:
1509 case -NFS4ERR_BAD_HIGH_SLOT:
1510 case -NFS4ERR_DEADSESSION:
1511 case -NFS4ERR_SEQ_FALSE_RETRY:
1512 case -NFS4ERR_SEQ_MISORDERED:
1513 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1514 /* Zero session reset errors */
1515 break;
1516 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1517 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
1518 break;
1519 case -EKEYEXPIRED:
1520 /* Nothing we can do */
1521 nfs4_warn_keyexpired(clp->cl_hostname);
1522 break;
1523 default:
1524 dprintk("%s: failed to handle error %d for server %s\n",
1525 __func__, error, clp->cl_hostname);
1526 return error;
1527 }
1528 dprintk("%s: handled error %d for server %s\n", __func__, error,
1529 clp->cl_hostname);
1530 return 0;
1531}
1532
1533static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
1534{
1535 struct nfs4_state_owner *sp;
1536 struct nfs_server *server;
1537 struct rb_node *pos;
1538 int status = 0;
1539
1540restart:
1541 rcu_read_lock();
1542 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
1543 nfs4_purge_state_owners(server);
1544 spin_lock(&clp->cl_lock);
1545 for (pos = rb_first(&server->state_owners);
1546 pos != NULL;
1547 pos = rb_next(pos)) {
1548 sp = rb_entry(pos,
1549 struct nfs4_state_owner, so_server_node);
1550 if (!test_and_clear_bit(ops->owner_flag_bit,
1551 &sp->so_flags))
1552 continue;
1553 atomic_inc(&sp->so_count);
1554 spin_unlock(&clp->cl_lock);
1555 rcu_read_unlock();
1556
1557 status = nfs4_reclaim_open_state(sp, ops);
1558 if (status < 0) {
1559 set_bit(ops->owner_flag_bit, &sp->so_flags);
1560 nfs4_put_state_owner(sp);
1561 return nfs4_recovery_handle_error(clp, status);
1562 }
1563
1564 nfs4_put_state_owner(sp);
1565 goto restart;
1566 }
1567 spin_unlock(&clp->cl_lock);
1568 }
1569 rcu_read_unlock();
1570 return status;
1571}
1572
1573static int nfs4_check_lease(struct nfs_client *clp)
1574{
1575 struct rpc_cred *cred;
1576 const struct nfs4_state_maintenance_ops *ops =
1577 clp->cl_mvops->state_renewal_ops;
1578 int status;
1579
1580 /* Is the client already known to have an expired lease? */
1581 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1582 return 0;
1583 spin_lock(&clp->cl_lock);
1584 cred = ops->get_state_renewal_cred_locked(clp);
1585 spin_unlock(&clp->cl_lock);
1586 if (cred == NULL) {
1587 cred = nfs4_get_setclientid_cred(clp);
1588 status = -ENOKEY;
1589 if (cred == NULL)
1590 goto out;
1591 }
1592 status = ops->renew_lease(clp, cred);
1593 put_rpccred(cred);
1594out:
1595 return nfs4_recovery_handle_error(clp, status);
1596}
1597
1598/* Set NFS4CLNT_LEASE_EXPIRED for all v4.0 errors and for recoverable errors
1599 * on EXCHANGE_ID for v4.1
1600 */
1601static int nfs4_handle_reclaim_lease_error(struct nfs_client *clp, int status)
1602{
1603 switch (status) {
1604 case -NFS4ERR_SEQ_MISORDERED:
1605 if (test_and_set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state))
1606 return -ESERVERFAULT;
1607 /* Lease confirmation error: retry after purging the lease */
1608 ssleep(1);
1609 case -NFS4ERR_CLID_INUSE:
1610 case -NFS4ERR_STALE_CLIENTID:
1611 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1612 break;
1613 case -EACCES:
1614 if (clp->cl_machine_cred == NULL)
1615 return -EACCES;
1616 /* Handle case where the user hasn't set up machine creds */
1617 nfs4_clear_machine_cred(clp);
1618 case -NFS4ERR_DELAY:
1619 case -ETIMEDOUT:
1620 case -EAGAIN:
1621 ssleep(1);
1622 break;
1623
1624 case -NFS4ERR_MINOR_VERS_MISMATCH:
1625 if (clp->cl_cons_state == NFS_CS_SESSION_INITING)
1626 nfs_mark_client_ready(clp, -EPROTONOSUPPORT);
1627 dprintk("%s: exit with error %d for server %s\n",
1628 __func__, -EPROTONOSUPPORT, clp->cl_hostname);
1629 return -EPROTONOSUPPORT;
1630 case -EKEYEXPIRED:
1631 nfs4_warn_keyexpired(clp->cl_hostname);
1632 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
1633 * in nfs4_exchange_id */
1634 default:
1635 dprintk("%s: exit with error %d for server %s\n", __func__,
1636 status, clp->cl_hostname);
1637 return status;
1638 }
1639 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1640 dprintk("%s: handled error %d for server %s\n", __func__, status,
1641 clp->cl_hostname);
1642 return 0;
1643}
1644
1645static int nfs4_reclaim_lease(struct nfs_client *clp)
1646{
1647 struct rpc_cred *cred;
1648 const struct nfs4_state_recovery_ops *ops =
1649 clp->cl_mvops->reboot_recovery_ops;
1650 int status;
1651
1652 cred = ops->get_clid_cred(clp);
1653 if (cred == NULL)
1654 return -ENOENT;
1655 status = ops->establish_clid(clp, cred);
1656 put_rpccred(cred);
1657 if (status != 0)
1658 return nfs4_handle_reclaim_lease_error(clp, status);
1659 return 0;
1660}
1661
1662#ifdef CONFIG_NFS_V4_1
1663void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
1664{
1665 struct nfs_client *clp = session->clp;
1666
1667 switch (err) {
1668 default:
1669 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1670 break;
1671 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1672 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
1673 }
1674 nfs4_schedule_lease_recovery(clp);
1675}
1676EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery);
1677
1678void nfs41_handle_recall_slot(struct nfs_client *clp)
1679{
1680 set_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state);
1681 dprintk("%s: scheduling slot recall for server %s\n", __func__,
1682 clp->cl_hostname);
1683 nfs4_schedule_state_manager(clp);
1684}
1685
1686static void nfs4_reset_all_state(struct nfs_client *clp)
1687{
1688 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
1689 set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
1690 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1691 nfs4_state_start_reclaim_nograce(clp);
1692 dprintk("%s: scheduling reset of all state for server %s!\n",
1693 __func__, clp->cl_hostname);
1694 nfs4_schedule_state_manager(clp);
1695 }
1696}
1697
1698static void nfs41_handle_server_reboot(struct nfs_client *clp)
1699{
1700 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
1701 nfs4_state_start_reclaim_reboot(clp);
1702 dprintk("%s: server %s rebooted!\n", __func__,
1703 clp->cl_hostname);
1704 nfs4_schedule_state_manager(clp);
1705 }
1706}
1707
1708static void nfs41_handle_state_revoked(struct nfs_client *clp)
1709{
1710 nfs4_reset_all_state(clp);
1711 dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
1712}
1713
1714static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp)
1715{
1716 /* This will need to handle layouts too */
1717 nfs_expire_all_delegations(clp);
1718 dprintk("%s: Recallable state revoked on server %s!\n", __func__,
1719 clp->cl_hostname);
1720}
1721
1722static void nfs41_handle_backchannel_fault(struct nfs_client *clp)
1723{
1724 nfs_expire_all_delegations(clp);
1725 if (test_and_set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) == 0)
1726 nfs4_schedule_state_manager(clp);
1727 dprintk("%s: server %s declared a backchannel fault\n", __func__,
1728 clp->cl_hostname);
1729}
1730
1731static void nfs41_handle_cb_path_down(struct nfs_client *clp)
1732{
1733 if (test_and_set_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
1734 &clp->cl_state) == 0)
1735 nfs4_schedule_state_manager(clp);
1736}
1737
1738void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags)
1739{
1740 if (!flags)
1741 return;
1742
1743 dprintk("%s: \"%s\" (client ID %llx) flags=0x%08x\n",
1744 __func__, clp->cl_hostname, clp->cl_clientid, flags);
1745
1746 if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED)
1747 nfs41_handle_server_reboot(clp);
1748 if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED |
1749 SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED |
1750 SEQ4_STATUS_ADMIN_STATE_REVOKED |
1751 SEQ4_STATUS_LEASE_MOVED))
1752 nfs41_handle_state_revoked(clp);
1753 if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED)
1754 nfs41_handle_recallable_state_revoked(clp);
1755 if (flags & SEQ4_STATUS_BACKCHANNEL_FAULT)
1756 nfs41_handle_backchannel_fault(clp);
1757 else if (flags & (SEQ4_STATUS_CB_PATH_DOWN |
1758 SEQ4_STATUS_CB_PATH_DOWN_SESSION))
1759 nfs41_handle_cb_path_down(clp);
1760}
1761
1762static int nfs4_reset_session(struct nfs_client *clp)
1763{
1764 struct rpc_cred *cred;
1765 int status;
1766
1767 if (!nfs4_has_session(clp))
1768 return 0;
1769 nfs4_begin_drain_session(clp);
1770 cred = nfs4_get_exchange_id_cred(clp);
1771 status = nfs4_proc_destroy_session(clp->cl_session, cred);
1772 if (status && status != -NFS4ERR_BADSESSION &&
1773 status != -NFS4ERR_DEADSESSION) {
1774 status = nfs4_recovery_handle_error(clp, status);
1775 goto out;
1776 }
1777
1778 memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
1779 status = nfs4_proc_create_session(clp, cred);
1780 if (status) {
1781 dprintk("%s: session reset failed with status %d for server %s!\n",
1782 __func__, status, clp->cl_hostname);
1783 status = nfs4_handle_reclaim_lease_error(clp, status);
1784 goto out;
1785 }
1786 nfs41_finish_session_reset(clp);
1787 dprintk("%s: session reset was successful for server %s!\n",
1788 __func__, clp->cl_hostname);
1789out:
1790 if (cred)
1791 put_rpccred(cred);
1792 return status;
1793}
1794
1795static int nfs4_recall_slot(struct nfs_client *clp)
1796{
1797 struct nfs4_slot_table *fc_tbl;
1798 struct nfs4_slot *new, *old;
1799 int i;
1800
1801 if (!nfs4_has_session(clp))
1802 return 0;
1803 nfs4_begin_drain_session(clp);
1804 fc_tbl = &clp->cl_session->fc_slot_table;
1805 new = kmalloc(fc_tbl->target_max_slots * sizeof(struct nfs4_slot),
1806 GFP_NOFS);
1807 if (!new)
1808 return -ENOMEM;
1809
1810 spin_lock(&fc_tbl->slot_tbl_lock);
1811 for (i = 0; i < fc_tbl->target_max_slots; i++)
1812 new[i].seq_nr = fc_tbl->slots[i].seq_nr;
1813 old = fc_tbl->slots;
1814 fc_tbl->slots = new;
1815 fc_tbl->max_slots = fc_tbl->target_max_slots;
1816 fc_tbl->target_max_slots = 0;
1817 clp->cl_session->fc_attrs.max_reqs = fc_tbl->max_slots;
1818 spin_unlock(&fc_tbl->slot_tbl_lock);
1819
1820 kfree(old);
1821 return 0;
1822}
1823
1824static int nfs4_bind_conn_to_session(struct nfs_client *clp)
1825{
1826 struct rpc_cred *cred;
1827 int ret;
1828
1829 if (!nfs4_has_session(clp))
1830 return 0;
1831 nfs4_begin_drain_session(clp);
1832 cred = nfs4_get_exchange_id_cred(clp);
1833 ret = nfs4_proc_bind_conn_to_session(clp, cred);
1834 if (cred)
1835 put_rpccred(cred);
1836 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
1837 switch (ret) {
1838 case 0:
1839 dprintk("%s: bind_conn_to_session was successful for server %s!\n",
1840 __func__, clp->cl_hostname);
1841 break;
1842 case -NFS4ERR_DELAY:
1843 ssleep(1);
1844 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
1845 break;
1846 default:
1847 return nfs4_recovery_handle_error(clp, ret);
1848 }
1849 return 0;
1850}
1851#else /* CONFIG_NFS_V4_1 */
1852static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
1853static int nfs4_end_drain_session(struct nfs_client *clp) { return 0; }
1854static int nfs4_recall_slot(struct nfs_client *clp) { return 0; }
1855
1856static int nfs4_bind_conn_to_session(struct nfs_client *clp)
1857{
1858 return 0;
1859}
1860#endif /* CONFIG_NFS_V4_1 */
1861
1862static void nfs4_state_manager(struct nfs_client *clp)
1863{
1864 int status = 0;
1865 const char *section = "", *section_sep = "";
1866
1867 /* Ensure exclusive access to NFSv4 state */
1868 do {
1869 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
1870 section = "purge state";
1871 status = nfs4_reclaim_lease(clp);
1872 if (status < 0)
1873 goto out_error;
1874 clear_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
1875 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1876 }
1877
1878 if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
1879 section = "lease expired";
1880 /* We're going to have to re-establish a clientid */
1881 status = nfs4_reclaim_lease(clp);
1882 if (status < 0)
1883 goto out_error;
1884 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1885 continue;
1886 clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1887
1888 if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH,
1889 &clp->cl_state))
1890 nfs4_state_start_reclaim_nograce(clp);
1891 else
1892 set_bit(NFS4CLNT_RECLAIM_REBOOT,
1893 &clp->cl_state);
1894
1895 pnfs_destroy_all_layouts(clp);
1896 }
1897
1898 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
1899 section = "check lease";
1900 status = nfs4_check_lease(clp);
1901 if (status < 0)
1902 goto out_error;
1903 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1904 continue;
1905 }
1906
1907 /* Initialize or reset the session */
1908 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) {
1909 section = "reset session";
1910 status = nfs4_reset_session(clp);
1911 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1912 continue;
1913 if (status < 0)
1914 goto out_error;
1915 }
1916
1917 /* Send BIND_CONN_TO_SESSION */
1918 if (test_and_clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
1919 &clp->cl_state)) {
1920 section = "bind conn to session";
1921 status = nfs4_bind_conn_to_session(clp);
1922 if (status < 0)
1923 goto out_error;
1924 continue;
1925 }
1926
1927 /* Recall session slots */
1928 if (test_and_clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state)) {
1929 section = "recall slot";
1930 status = nfs4_recall_slot(clp);
1931 if (status < 0)
1932 goto out_error;
1933 continue;
1934 }
1935
1936 /* First recover reboot state... */
1937 if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
1938 section = "reclaim reboot";
1939 status = nfs4_do_reclaim(clp,
1940 clp->cl_mvops->reboot_recovery_ops);
1941 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
1942 test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
1943 continue;
1944 nfs4_state_end_reclaim_reboot(clp);
1945 if (test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
1946 continue;
1947 if (status < 0)
1948 goto out_error;
1949 }
1950
1951 /* Now recover expired state... */
1952 if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
1953 section = "reclaim nograce";
1954 status = nfs4_do_reclaim(clp,
1955 clp->cl_mvops->nograce_recovery_ops);
1956 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
1957 test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) ||
1958 test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1959 continue;
1960 if (status < 0)
1961 goto out_error;
1962 }
1963
1964 nfs4_end_drain_session(clp);
1965 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
1966 nfs_client_return_marked_delegations(clp);
1967 continue;
1968 }
1969
1970 nfs4_clear_state_manager_bit(clp);
1971 /* Did we race with an attempt to give us more work? */
1972 if (clp->cl_state == 0)
1973 break;
1974 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1975 break;
1976 } while (atomic_read(&clp->cl_count) > 1);
1977 return;
1978out_error:
1979 if (strlen(section))
1980 section_sep = ": ";
1981 pr_warn_ratelimited("NFS: state manager%s%s failed on NFSv4 server %s"
1982 " with error %d\n", section_sep, section,
1983 clp->cl_hostname, -status);
1984 nfs4_end_drain_session(clp);
1985 nfs4_clear_state_manager_bit(clp);
1986}
1987
1988static int nfs4_run_state_manager(void *ptr)
1989{
1990 struct nfs_client *clp = ptr;
1991
1992 allow_signal(SIGKILL);
1993 nfs4_state_manager(clp);
1994 nfs_put_client(clp);
1995 module_put_and_exit(0);
1996 return 0;
1997}
1998
1999/*
2000 * Local variables:
2001 * c-basic-offset: 8
2002 * End:
2003 */
Linux kernel - Deliverables
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