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[SCSI] mpt2sas: Fix for dead lock occurring between host_lock and sas_device_lock
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / nfs / nfs4state.c
blob39914be40b03694008ada2c56af6aaf5fb3a7f97
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
53 #include "nfs4_fs.h"
54 #include "callback.h"
55 #include "delegation.h"
56 #include "internal.h"
57 #include "pnfs.h"
58
59 #define OPENOWNER_POOL_SIZE 8
60
61 const nfs4_stateid zero_stateid;
62
63 static LIST_HEAD(nfs4_clientid_list);
64
65 int nfs4_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
66 {
67 struct nfs4_setclientid_res clid = {
68 .clientid = clp->cl_clientid,
69 .confirm = clp->cl_confirm,
70 };
71 unsigned short port;
72 int status;
73
74 if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
75 goto do_confirm;
76 port = nfs_callback_tcpport;
77 if (clp->cl_addr.ss_family == AF_INET6)
78 port = nfs_callback_tcpport6;
79
80 status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
81 if (status != 0)
82 goto out;
83 clp->cl_clientid = clid.clientid;
84 clp->cl_confirm = clid.confirm;
85 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
86 do_confirm:
87 status = nfs4_proc_setclientid_confirm(clp, &clid, cred);
88 if (status != 0)
89 goto out;
90 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
91 nfs4_schedule_state_renewal(clp);
92 out:
93 return status;
94 }
95
96 struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp)
97 {
98 struct rpc_cred *cred = NULL;
99
100 if (clp->cl_machine_cred != NULL)
101 cred = get_rpccred(clp->cl_machine_cred);
102 return cred;
103 }
104
105 static void nfs4_clear_machine_cred(struct nfs_client *clp)
106 {
107 struct rpc_cred *cred;
108
109 spin_lock(&clp->cl_lock);
110 cred = clp->cl_machine_cred;
111 clp->cl_machine_cred = NULL;
112 spin_unlock(&clp->cl_lock);
113 if (cred != NULL)
114 put_rpccred(cred);
115 }
116
117 static struct rpc_cred *
118 nfs4_get_renew_cred_server_locked(struct nfs_server *server)
119 {
120 struct rpc_cred *cred = NULL;
121 struct nfs4_state_owner *sp;
122 struct rb_node *pos;
123
124 for (pos = rb_first(&server->state_owners);
125 pos != NULL;
126 pos = rb_next(pos)) {
127 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
128 if (list_empty(&sp->so_states))
129 continue;
130 cred = get_rpccred(sp->so_cred);
131 break;
132 }
133 return cred;
134 }
135
136 /**
137 * nfs4_get_renew_cred_locked - Acquire credential for a renew operation
138 * @clp: client state handle
139 *
140 * Returns an rpc_cred with reference count bumped, or NULL.
141 * Caller must hold clp->cl_lock.
142 */
143 struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp)
144 {
145 struct rpc_cred *cred = NULL;
146 struct nfs_server *server;
147
148 rcu_read_lock();
149 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
150 cred = nfs4_get_renew_cred_server_locked(server);
151 if (cred != NULL)
152 break;
153 }
154 rcu_read_unlock();
155 return cred;
156 }
157
158 #if defined(CONFIG_NFS_V4_1)
159
160 static int nfs41_setup_state_renewal(struct nfs_client *clp)
161 {
162 int status;
163 struct nfs_fsinfo fsinfo;
164
165 if (!test_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state)) {
166 nfs4_schedule_state_renewal(clp);
167 return 0;
168 }
169
170 status = nfs4_proc_get_lease_time(clp, &fsinfo);
171 if (status == 0) {
172 /* Update lease time and schedule renewal */
173 spin_lock(&clp->cl_lock);
174 clp->cl_lease_time = fsinfo.lease_time * HZ;
175 clp->cl_last_renewal = jiffies;
176 spin_unlock(&clp->cl_lock);
177
178 nfs4_schedule_state_renewal(clp);
179 }
180
181 return status;
182 }
183
184 /*
185 * Back channel returns NFS4ERR_DELAY for new requests when
186 * NFS4_SESSION_DRAINING is set so there is no work to be done when draining
187 * is ended.
188 */
189 static void nfs4_end_drain_session(struct nfs_client *clp)
190 {
191 struct nfs4_session *ses = clp->cl_session;
192 int max_slots;
193
194 if (ses == NULL)
195 return;
196 if (test_and_clear_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
197 spin_lock(&ses->fc_slot_table.slot_tbl_lock);
198 max_slots = ses->fc_slot_table.max_slots;
199 while (max_slots--) {
200 struct rpc_task *task;
201
202 task = rpc_wake_up_next(&ses->fc_slot_table.
203 slot_tbl_waitq);
204 if (!task)
205 break;
206 rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
207 }
208 spin_unlock(&ses->fc_slot_table.slot_tbl_lock);
209 }
210 }
211
212 static int nfs4_wait_on_slot_tbl(struct nfs4_slot_table *tbl)
213 {
214 spin_lock(&tbl->slot_tbl_lock);
215 if (tbl->highest_used_slotid != -1) {
216 INIT_COMPLETION(tbl->complete);
217 spin_unlock(&tbl->slot_tbl_lock);
218 return wait_for_completion_interruptible(&tbl->complete);
219 }
220 spin_unlock(&tbl->slot_tbl_lock);
221 return 0;
222 }
223
224 static int nfs4_begin_drain_session(struct nfs_client *clp)
225 {
226 struct nfs4_session *ses = clp->cl_session;
227 int ret = 0;
228
229 set_bit(NFS4_SESSION_DRAINING, &ses->session_state);
230 /* back channel */
231 ret = nfs4_wait_on_slot_tbl(&ses->bc_slot_table);
232 if (ret)
233 return ret;
234 /* fore channel */
235 return nfs4_wait_on_slot_tbl(&ses->fc_slot_table);
236 }
237
238 int nfs41_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
239 {
240 int status;
241
242 if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
243 goto do_confirm;
244 nfs4_begin_drain_session(clp);
245 status = nfs4_proc_exchange_id(clp, cred);
246 if (status != 0)
247 goto out;
248 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
249 do_confirm:
250 status = nfs4_proc_create_session(clp);
251 if (status != 0)
252 goto out;
253 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
254 nfs41_setup_state_renewal(clp);
255 nfs_mark_client_ready(clp, NFS_CS_READY);
256 out:
257 return status;
258 }
259
260 struct rpc_cred *nfs4_get_exchange_id_cred(struct nfs_client *clp)
261 {
262 struct rpc_cred *cred;
263
264 spin_lock(&clp->cl_lock);
265 cred = nfs4_get_machine_cred_locked(clp);
266 spin_unlock(&clp->cl_lock);
267 return cred;
268 }
269
270 #endif /* CONFIG_NFS_V4_1 */
271
272 static struct rpc_cred *
273 nfs4_get_setclientid_cred_server(struct nfs_server *server)
274 {
275 struct nfs_client *clp = server->nfs_client;
276 struct rpc_cred *cred = NULL;
277 struct nfs4_state_owner *sp;
278 struct rb_node *pos;
279
280 spin_lock(&clp->cl_lock);
281 pos = rb_first(&server->state_owners);
282 if (pos != NULL) {
283 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
284 cred = get_rpccred(sp->so_cred);
285 }
286 spin_unlock(&clp->cl_lock);
287 return cred;
288 }
289
290 /**
291 * nfs4_get_setclientid_cred - Acquire credential for a setclientid operation
292 * @clp: client state handle
293 *
294 * Returns an rpc_cred with reference count bumped, or NULL.
295 */
296 struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp)
297 {
298 struct nfs_server *server;
299 struct rpc_cred *cred;
300
301 spin_lock(&clp->cl_lock);
302 cred = nfs4_get_machine_cred_locked(clp);
303 spin_unlock(&clp->cl_lock);
304 if (cred != NULL)
305 goto out;
306
307 rcu_read_lock();
308 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
309 cred = nfs4_get_setclientid_cred_server(server);
310 if (cred != NULL)
311 break;
312 }
313 rcu_read_unlock();
314
315 out:
316 return cred;
317 }
318
319 static void nfs_alloc_unique_id_locked(struct rb_root *root,
320 struct nfs_unique_id *new,
321 __u64 minval, int maxbits)
322 {
323 struct rb_node **p, *parent;
324 struct nfs_unique_id *pos;
325 __u64 mask = ~0ULL;
326
327 if (maxbits < 64)
328 mask = (1ULL << maxbits) - 1ULL;
329
330 /* Ensure distribution is more or less flat */
331 get_random_bytes(&new->id, sizeof(new->id));
332 new->id &= mask;
333 if (new->id < minval)
334 new->id += minval;
335 retry:
336 p = &root->rb_node;
337 parent = NULL;
338
339 while (*p != NULL) {
340 parent = *p;
341 pos = rb_entry(parent, struct nfs_unique_id, rb_node);
342
343 if (new->id < pos->id)
344 p = &(*p)->rb_left;
345 else if (new->id > pos->id)
346 p = &(*p)->rb_right;
347 else
348 goto id_exists;
349 }
350 rb_link_node(&new->rb_node, parent, p);
351 rb_insert_color(&new->rb_node, root);
352 return;
353 id_exists:
354 for (;;) {
355 new->id++;
356 if (new->id < minval || (new->id & mask) != new->id) {
357 new->id = minval;
358 break;
359 }
360 parent = rb_next(parent);
361 if (parent == NULL)
362 break;
363 pos = rb_entry(parent, struct nfs_unique_id, rb_node);
364 if (new->id < pos->id)
365 break;
366 }
367 goto retry;
368 }
369
370 static void nfs_free_unique_id(struct rb_root *root, struct nfs_unique_id *id)
371 {
372 rb_erase(&id->rb_node, root);
373 }
374
375 static struct nfs4_state_owner *
376 nfs4_find_state_owner_locked(struct nfs_server *server, struct rpc_cred *cred)
377 {
378 struct rb_node **p = &server->state_owners.rb_node,
379 *parent = NULL;
380 struct nfs4_state_owner *sp, *res = NULL;
381
382 while (*p != NULL) {
383 parent = *p;
384 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
385
386 if (server < sp->so_server) {
387 p = &parent->rb_left;
388 continue;
389 }
390 if (server > sp->so_server) {
391 p = &parent->rb_right;
392 continue;
393 }
394 if (cred < sp->so_cred)
395 p = &parent->rb_left;
396 else if (cred > sp->so_cred)
397 p = &parent->rb_right;
398 else {
399 atomic_inc(&sp->so_count);
400 res = sp;
401 break;
402 }
403 }
404 return res;
405 }
406
407 static struct nfs4_state_owner *
408 nfs4_insert_state_owner_locked(struct nfs4_state_owner *new)
409 {
410 struct nfs_server *server = new->so_server;
411 struct rb_node **p = &server->state_owners.rb_node,
412 *parent = NULL;
413 struct nfs4_state_owner *sp;
414
415 while (*p != NULL) {
416 parent = *p;
417 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
418
419 if (new->so_cred < sp->so_cred)
420 p = &parent->rb_left;
421 else if (new->so_cred > sp->so_cred)
422 p = &parent->rb_right;
423 else {
424 atomic_inc(&sp->so_count);
425 return sp;
426 }
427 }
428 nfs_alloc_unique_id_locked(&server->openowner_id,
429 &new->so_owner_id, 1, 64);
430 rb_link_node(&new->so_server_node, parent, p);
431 rb_insert_color(&new->so_server_node, &server->state_owners);
432 return new;
433 }
434
435 static void
436 nfs4_remove_state_owner_locked(struct nfs4_state_owner *sp)
437 {
438 struct nfs_server *server = sp->so_server;
439
440 if (!RB_EMPTY_NODE(&sp->so_server_node))
441 rb_erase(&sp->so_server_node, &server->state_owners);
442 nfs_free_unique_id(&server->openowner_id, &sp->so_owner_id);
443 }
444
445 /*
446 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
447 * create a new state_owner.
448 *
449 */
450 static struct nfs4_state_owner *
451 nfs4_alloc_state_owner(void)
452 {
453 struct nfs4_state_owner *sp;
454
455 sp = kzalloc(sizeof(*sp),GFP_NOFS);
456 if (!sp)
457 return NULL;
458 spin_lock_init(&sp->so_lock);
459 INIT_LIST_HEAD(&sp->so_states);
460 rpc_init_wait_queue(&sp->so_sequence.wait, "Seqid_waitqueue");
461 sp->so_seqid.sequence = &sp->so_sequence;
462 spin_lock_init(&sp->so_sequence.lock);
463 INIT_LIST_HEAD(&sp->so_sequence.list);
464 atomic_set(&sp->so_count, 1);
465 return sp;
466 }
467
468 static void
469 nfs4_drop_state_owner(struct nfs4_state_owner *sp)
470 {
471 if (!RB_EMPTY_NODE(&sp->so_server_node)) {
472 struct nfs_server *server = sp->so_server;
473 struct nfs_client *clp = server->nfs_client;
474
475 spin_lock(&clp->cl_lock);
476 rb_erase(&sp->so_server_node, &server->state_owners);
477 RB_CLEAR_NODE(&sp->so_server_node);
478 spin_unlock(&clp->cl_lock);
479 }
480 }
481
482 /**
483 * nfs4_get_state_owner - Look up a state owner given a credential
484 * @server: nfs_server to search
485 * @cred: RPC credential to match
486 *
487 * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL.
488 */
489 struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server,
490 struct rpc_cred *cred)
491 {
492 struct nfs_client *clp = server->nfs_client;
493 struct nfs4_state_owner *sp, *new;
494
495 spin_lock(&clp->cl_lock);
496 sp = nfs4_find_state_owner_locked(server, cred);
497 spin_unlock(&clp->cl_lock);
498 if (sp != NULL)
499 return sp;
500 new = nfs4_alloc_state_owner();
501 if (new == NULL)
502 return NULL;
503 new->so_server = server;
504 new->so_cred = cred;
505 spin_lock(&clp->cl_lock);
506 sp = nfs4_insert_state_owner_locked(new);
507 spin_unlock(&clp->cl_lock);
508 if (sp == new)
509 get_rpccred(cred);
510 else {
511 rpc_destroy_wait_queue(&new->so_sequence.wait);
512 kfree(new);
513 }
514 return sp;
515 }
516
517 /**
518 * nfs4_put_state_owner - Release a nfs4_state_owner
519 * @sp: state owner data to release
520 *
521 */
522 void nfs4_put_state_owner(struct nfs4_state_owner *sp)
523 {
524 struct nfs_client *clp = sp->so_server->nfs_client;
525 struct rpc_cred *cred = sp->so_cred;
526
527 if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
528 return;
529 nfs4_remove_state_owner_locked(sp);
530 spin_unlock(&clp->cl_lock);
531 rpc_destroy_wait_queue(&sp->so_sequence.wait);
532 put_rpccred(cred);
533 kfree(sp);
534 }
535
536 static struct nfs4_state *
537 nfs4_alloc_open_state(void)
538 {
539 struct nfs4_state *state;
540
541 state = kzalloc(sizeof(*state), GFP_NOFS);
542 if (!state)
543 return NULL;
544 atomic_set(&state->count, 1);
545 INIT_LIST_HEAD(&state->lock_states);
546 spin_lock_init(&state->state_lock);
547 seqlock_init(&state->seqlock);
548 return state;
549 }
550
551 void
552 nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode)
553 {
554 if (state->state == fmode)
555 return;
556 /* NB! List reordering - see the reclaim code for why. */
557 if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) {
558 if (fmode & FMODE_WRITE)
559 list_move(&state->open_states, &state->owner->so_states);
560 else
561 list_move_tail(&state->open_states, &state->owner->so_states);
562 }
563 state->state = fmode;
564 }
565
566 static struct nfs4_state *
567 __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner)
568 {
569 struct nfs_inode *nfsi = NFS_I(inode);
570 struct nfs4_state *state;
571
572 list_for_each_entry(state, &nfsi->open_states, inode_states) {
573 if (state->owner != owner)
574 continue;
575 if (atomic_inc_not_zero(&state->count))
576 return state;
577 }
578 return NULL;
579 }
580
581 static void
582 nfs4_free_open_state(struct nfs4_state *state)
583 {
584 kfree(state);
585 }
586
587 struct nfs4_state *
588 nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
589 {
590 struct nfs4_state *state, *new;
591 struct nfs_inode *nfsi = NFS_I(inode);
592
593 spin_lock(&inode->i_lock);
594 state = __nfs4_find_state_byowner(inode, owner);
595 spin_unlock(&inode->i_lock);
596 if (state)
597 goto out;
598 new = nfs4_alloc_open_state();
599 spin_lock(&owner->so_lock);
600 spin_lock(&inode->i_lock);
601 state = __nfs4_find_state_byowner(inode, owner);
602 if (state == NULL && new != NULL) {
603 state = new;
604 state->owner = owner;
605 atomic_inc(&owner->so_count);
606 list_add(&state->inode_states, &nfsi->open_states);
607 ihold(inode);
608 state->inode = inode;
609 spin_unlock(&inode->i_lock);
610 /* Note: The reclaim code dictates that we add stateless
611 * and read-only stateids to the end of the list */
612 list_add_tail(&state->open_states, &owner->so_states);
613 spin_unlock(&owner->so_lock);
614 } else {
615 spin_unlock(&inode->i_lock);
616 spin_unlock(&owner->so_lock);
617 if (new)
618 nfs4_free_open_state(new);
619 }
620 out:
621 return state;
622 }
623
624 void nfs4_put_open_state(struct nfs4_state *state)
625 {
626 struct inode *inode = state->inode;
627 struct nfs4_state_owner *owner = state->owner;
628
629 if (!atomic_dec_and_lock(&state->count, &owner->so_lock))
630 return;
631 spin_lock(&inode->i_lock);
632 list_del(&state->inode_states);
633 list_del(&state->open_states);
634 spin_unlock(&inode->i_lock);
635 spin_unlock(&owner->so_lock);
636 iput(inode);
637 nfs4_free_open_state(state);
638 nfs4_put_state_owner(owner);
639 }
640
641 /*
642 * Close the current file.
643 */
644 static void __nfs4_close(struct nfs4_state *state,
645 fmode_t fmode, gfp_t gfp_mask, int wait)
646 {
647 struct nfs4_state_owner *owner = state->owner;
648 int call_close = 0;
649 fmode_t newstate;
650
651 atomic_inc(&owner->so_count);
652 /* Protect against nfs4_find_state() */
653 spin_lock(&owner->so_lock);
654 switch (fmode & (FMODE_READ | FMODE_WRITE)) {
655 case FMODE_READ:
656 state->n_rdonly--;
657 break;
658 case FMODE_WRITE:
659 state->n_wronly--;
660 break;
661 case FMODE_READ|FMODE_WRITE:
662 state->n_rdwr--;
663 }
664 newstate = FMODE_READ|FMODE_WRITE;
665 if (state->n_rdwr == 0) {
666 if (state->n_rdonly == 0) {
667 newstate &= ~FMODE_READ;
668 call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
669 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
670 }
671 if (state->n_wronly == 0) {
672 newstate &= ~FMODE_WRITE;
673 call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
674 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
675 }
676 if (newstate == 0)
677 clear_bit(NFS_DELEGATED_STATE, &state->flags);
678 }
679 nfs4_state_set_mode_locked(state, newstate);
680 spin_unlock(&owner->so_lock);
681
682 if (!call_close) {
683 nfs4_put_open_state(state);
684 nfs4_put_state_owner(owner);
685 } else {
686 bool roc = pnfs_roc(state->inode);
687
688 nfs4_do_close(state, gfp_mask, wait, roc);
689 }
690 }
691
692 void nfs4_close_state(struct nfs4_state *state, fmode_t fmode)
693 {
694 __nfs4_close(state, fmode, GFP_NOFS, 0);
695 }
696
697 void nfs4_close_sync(struct nfs4_state *state, fmode_t fmode)
698 {
699 __nfs4_close(state, fmode, GFP_KERNEL, 1);
700 }
701
702 /*
703 * Search the state->lock_states for an existing lock_owner
704 * that is compatible with current->files
705 */
706 static struct nfs4_lock_state *
707 __nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid, unsigned int type)
708 {
709 struct nfs4_lock_state *pos;
710 list_for_each_entry(pos, &state->lock_states, ls_locks) {
711 if (type != NFS4_ANY_LOCK_TYPE && pos->ls_owner.lo_type != type)
712 continue;
713 switch (pos->ls_owner.lo_type) {
714 case NFS4_POSIX_LOCK_TYPE:
715 if (pos->ls_owner.lo_u.posix_owner != fl_owner)
716 continue;
717 break;
718 case NFS4_FLOCK_LOCK_TYPE:
719 if (pos->ls_owner.lo_u.flock_owner != fl_pid)
720 continue;
721 }
722 atomic_inc(&pos->ls_count);
723 return pos;
724 }
725 return NULL;
726 }
727
728 /*
729 * Return a compatible lock_state. If no initialized lock_state structure
730 * exists, return an uninitialized one.
731 *
732 */
733 static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid, unsigned int type)
734 {
735 struct nfs4_lock_state *lsp;
736 struct nfs_server *server = state->owner->so_server;
737 struct nfs_client *clp = server->nfs_client;
738
739 lsp = kzalloc(sizeof(*lsp), GFP_NOFS);
740 if (lsp == NULL)
741 return NULL;
742 rpc_init_wait_queue(&lsp->ls_sequence.wait, "lock_seqid_waitqueue");
743 spin_lock_init(&lsp->ls_sequence.lock);
744 INIT_LIST_HEAD(&lsp->ls_sequence.list);
745 lsp->ls_seqid.sequence = &lsp->ls_sequence;
746 atomic_set(&lsp->ls_count, 1);
747 lsp->ls_state = state;
748 lsp->ls_owner.lo_type = type;
749 switch (lsp->ls_owner.lo_type) {
750 case NFS4_FLOCK_LOCK_TYPE:
751 lsp->ls_owner.lo_u.flock_owner = fl_pid;
752 break;
753 case NFS4_POSIX_LOCK_TYPE:
754 lsp->ls_owner.lo_u.posix_owner = fl_owner;
755 break;
756 default:
757 kfree(lsp);
758 return NULL;
759 }
760 spin_lock(&clp->cl_lock);
761 nfs_alloc_unique_id_locked(&server->lockowner_id, &lsp->ls_id, 1, 64);
762 spin_unlock(&clp->cl_lock);
763 INIT_LIST_HEAD(&lsp->ls_locks);
764 return lsp;
765 }
766
767 static void nfs4_free_lock_state(struct nfs4_lock_state *lsp)
768 {
769 struct nfs_server *server = lsp->ls_state->owner->so_server;
770 struct nfs_client *clp = server->nfs_client;
771
772 spin_lock(&clp->cl_lock);
773 nfs_free_unique_id(&server->lockowner_id, &lsp->ls_id);
774 spin_unlock(&clp->cl_lock);
775 rpc_destroy_wait_queue(&lsp->ls_sequence.wait);
776 kfree(lsp);
777 }
778
779 /*
780 * Return a compatible lock_state. If no initialized lock_state structure
781 * exists, return an uninitialized one.
782 *
783 */
784 static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner, pid_t pid, unsigned int type)
785 {
786 struct nfs4_lock_state *lsp, *new = NULL;
787
788 for(;;) {
789 spin_lock(&state->state_lock);
790 lsp = __nfs4_find_lock_state(state, owner, pid, type);
791 if (lsp != NULL)
792 break;
793 if (new != NULL) {
794 list_add(&new->ls_locks, &state->lock_states);
795 set_bit(LK_STATE_IN_USE, &state->flags);
796 lsp = new;
797 new = NULL;
798 break;
799 }
800 spin_unlock(&state->state_lock);
801 new = nfs4_alloc_lock_state(state, owner, pid, type);
802 if (new == NULL)
803 return NULL;
804 }
805 spin_unlock(&state->state_lock);
806 if (new != NULL)
807 nfs4_free_lock_state(new);
808 return lsp;
809 }
810
811 /*
812 * Release reference to lock_state, and free it if we see that
813 * it is no longer in use
814 */
815 void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
816 {
817 struct nfs4_state *state;
818
819 if (lsp == NULL)
820 return;
821 state = lsp->ls_state;
822 if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock))
823 return;
824 list_del(&lsp->ls_locks);
825 if (list_empty(&state->lock_states))
826 clear_bit(LK_STATE_IN_USE, &state->flags);
827 spin_unlock(&state->state_lock);
828 if (lsp->ls_flags & NFS_LOCK_INITIALIZED)
829 nfs4_release_lockowner(lsp);
830 nfs4_free_lock_state(lsp);
831 }
832
833 static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
834 {
835 struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
836
837 dst->fl_u.nfs4_fl.owner = lsp;
838 atomic_inc(&lsp->ls_count);
839 }
840
841 static void nfs4_fl_release_lock(struct file_lock *fl)
842 {
843 nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
844 }
845
846 static const struct file_lock_operations nfs4_fl_lock_ops = {
847 .fl_copy_lock = nfs4_fl_copy_lock,
848 .fl_release_private = nfs4_fl_release_lock,
849 };
850
851 int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
852 {
853 struct nfs4_lock_state *lsp;
854
855 if (fl->fl_ops != NULL)
856 return 0;
857 if (fl->fl_flags & FL_POSIX)
858 lsp = nfs4_get_lock_state(state, fl->fl_owner, 0, NFS4_POSIX_LOCK_TYPE);
859 else if (fl->fl_flags & FL_FLOCK)
860 lsp = nfs4_get_lock_state(state, 0, fl->fl_pid, NFS4_FLOCK_LOCK_TYPE);
861 else
862 return -EINVAL;
863 if (lsp == NULL)
864 return -ENOMEM;
865 fl->fl_u.nfs4_fl.owner = lsp;
866 fl->fl_ops = &nfs4_fl_lock_ops;
867 return 0;
868 }
869
870 /*
871 * Byte-range lock aware utility to initialize the stateid of read/write
872 * requests.
873 */
874 void nfs4_copy_stateid(nfs4_stateid *dst, struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid)
875 {
876 struct nfs4_lock_state *lsp;
877 int seq;
878
879 do {
880 seq = read_seqbegin(&state->seqlock);
881 memcpy(dst, &state->stateid, sizeof(*dst));
882 } while (read_seqretry(&state->seqlock, seq));
883 if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
884 return;
885
886 spin_lock(&state->state_lock);
887 lsp = __nfs4_find_lock_state(state, fl_owner, fl_pid, NFS4_ANY_LOCK_TYPE);
888 if (lsp != NULL && (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
889 memcpy(dst, &lsp->ls_stateid, sizeof(*dst));
890 spin_unlock(&state->state_lock);
891 nfs4_put_lock_state(lsp);
892 }
893
894 struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask)
895 {
896 struct nfs_seqid *new;
897
898 new = kmalloc(sizeof(*new), gfp_mask);
899 if (new != NULL) {
900 new->sequence = counter;
901 INIT_LIST_HEAD(&new->list);
902 }
903 return new;
904 }
905
906 void nfs_release_seqid(struct nfs_seqid *seqid)
907 {
908 if (!list_empty(&seqid->list)) {
909 struct rpc_sequence *sequence = seqid->sequence->sequence;
910
911 spin_lock(&sequence->lock);
912 list_del_init(&seqid->list);
913 spin_unlock(&sequence->lock);
914 rpc_wake_up(&sequence->wait);
915 }
916 }
917
918 void nfs_free_seqid(struct nfs_seqid *seqid)
919 {
920 nfs_release_seqid(seqid);
921 kfree(seqid);
922 }
923
924 /*
925 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
926 * failed with a seqid incrementing error -
927 * see comments nfs_fs.h:seqid_mutating_error()
928 */
929 static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
930 {
931 BUG_ON(list_first_entry(&seqid->sequence->sequence->list, struct nfs_seqid, list) != seqid);
932 switch (status) {
933 case 0:
934 break;
935 case -NFS4ERR_BAD_SEQID:
936 if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
937 return;
938 printk(KERN_WARNING "NFS: v4 server returned a bad"
939 " sequence-id error on an"
940 " unconfirmed sequence %p!\n",
941 seqid->sequence);
942 case -NFS4ERR_STALE_CLIENTID:
943 case -NFS4ERR_STALE_STATEID:
944 case -NFS4ERR_BAD_STATEID:
945 case -NFS4ERR_BADXDR:
946 case -NFS4ERR_RESOURCE:
947 case -NFS4ERR_NOFILEHANDLE:
948 /* Non-seqid mutating errors */
949 return;
950 };
951 /*
952 * Note: no locking needed as we are guaranteed to be first
953 * on the sequence list
954 */
955 seqid->sequence->counter++;
956 }
957
958 void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
959 {
960 struct nfs4_state_owner *sp = container_of(seqid->sequence,
961 struct nfs4_state_owner, so_seqid);
962 struct nfs_server *server = sp->so_server;
963
964 if (status == -NFS4ERR_BAD_SEQID)
965 nfs4_drop_state_owner(sp);
966 if (!nfs4_has_session(server->nfs_client))
967 nfs_increment_seqid(status, seqid);
968 }
969
970 /*
971 * Increment the seqid if the LOCK/LOCKU succeeded, or
972 * failed with a seqid incrementing error -
973 * see comments nfs_fs.h:seqid_mutating_error()
974 */
975 void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
976 {
977 nfs_increment_seqid(status, seqid);
978 }
979
980 int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
981 {
982 struct rpc_sequence *sequence = seqid->sequence->sequence;
983 int status = 0;
984
985 spin_lock(&sequence->lock);
986 if (list_empty(&seqid->list))
987 list_add_tail(&seqid->list, &sequence->list);
988 if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid)
989 goto unlock;
990 rpc_sleep_on(&sequence->wait, task, NULL);
991 status = -EAGAIN;
992 unlock:
993 spin_unlock(&sequence->lock);
994 return status;
995 }
996
997 static int nfs4_run_state_manager(void *);
998
999 static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
1000 {
1001 smp_mb__before_clear_bit();
1002 clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
1003 smp_mb__after_clear_bit();
1004 wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING);
1005 rpc_wake_up(&clp->cl_rpcwaitq);
1006 }
1007
1008 /*
1009 * Schedule the nfs_client asynchronous state management routine
1010 */
1011 void nfs4_schedule_state_manager(struct nfs_client *clp)
1012 {
1013 struct task_struct *task;
1014
1015 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1016 return;
1017 __module_get(THIS_MODULE);
1018 atomic_inc(&clp->cl_count);
1019 task = kthread_run(nfs4_run_state_manager, clp, "%s-manager",
1020 rpc_peeraddr2str(clp->cl_rpcclient,
1021 RPC_DISPLAY_ADDR));
1022 if (!IS_ERR(task))
1023 return;
1024 nfs4_clear_state_manager_bit(clp);
1025 nfs_put_client(clp);
1026 module_put(THIS_MODULE);
1027 }
1028
1029 /*
1030 * Schedule a lease recovery attempt
1031 */
1032 void nfs4_schedule_lease_recovery(struct nfs_client *clp)
1033 {
1034 if (!clp)
1035 return;
1036 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1037 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1038 nfs4_schedule_state_manager(clp);
1039 }
1040
1041 void nfs4_schedule_path_down_recovery(struct nfs_client *clp)
1042 {
1043 nfs_handle_cb_pathdown(clp);
1044 nfs4_schedule_state_manager(clp);
1045 }
1046
1047 static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
1048 {
1049
1050 set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1051 /* Don't recover state that expired before the reboot */
1052 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) {
1053 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1054 return 0;
1055 }
1056 set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags);
1057 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1058 return 1;
1059 }
1060
1061 static int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
1062 {
1063 set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
1064 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1065 set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags);
1066 set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
1067 return 1;
1068 }
1069
1070 void nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state)
1071 {
1072 struct nfs_client *clp = server->nfs_client;
1073
1074 nfs4_state_mark_reclaim_nograce(clp, state);
1075 nfs4_schedule_state_manager(clp);
1076 }
1077
1078 static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
1079 {
1080 struct inode *inode = state->inode;
1081 struct nfs_inode *nfsi = NFS_I(inode);
1082 struct file_lock *fl;
1083 int status = 0;
1084
1085 if (inode->i_flock == NULL)
1086 return 0;
1087
1088 /* Guard against delegation returns and new lock/unlock calls */
1089 down_write(&nfsi->rwsem);
1090 /* Protect inode->i_flock using the BKL */
1091 lock_flocks();
1092 for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) {
1093 if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK)))
1094 continue;
1095 if (nfs_file_open_context(fl->fl_file)->state != state)
1096 continue;
1097 unlock_flocks();
1098 status = ops->recover_lock(state, fl);
1099 switch (status) {
1100 case 0:
1101 break;
1102 case -ESTALE:
1103 case -NFS4ERR_ADMIN_REVOKED:
1104 case -NFS4ERR_STALE_STATEID:
1105 case -NFS4ERR_BAD_STATEID:
1106 case -NFS4ERR_EXPIRED:
1107 case -NFS4ERR_NO_GRACE:
1108 case -NFS4ERR_STALE_CLIENTID:
1109 case -NFS4ERR_BADSESSION:
1110 case -NFS4ERR_BADSLOT:
1111 case -NFS4ERR_BAD_HIGH_SLOT:
1112 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1113 goto out;
1114 default:
1115 printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n",
1116 __func__, status);
1117 case -ENOMEM:
1118 case -NFS4ERR_DENIED:
1119 case -NFS4ERR_RECLAIM_BAD:
1120 case -NFS4ERR_RECLAIM_CONFLICT:
1121 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1122 status = 0;
1123 }
1124 lock_flocks();
1125 }
1126 unlock_flocks();
1127 out:
1128 up_write(&nfsi->rwsem);
1129 return status;
1130 }
1131
1132 static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops)
1133 {
1134 struct nfs4_state *state;
1135 struct nfs4_lock_state *lock;
1136 int status = 0;
1137
1138 /* Note: we rely on the sp->so_states list being ordered
1139 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
1140 * states first.
1141 * This is needed to ensure that the server won't give us any
1142 * read delegations that we have to return if, say, we are
1143 * recovering after a network partition or a reboot from a
1144 * server that doesn't support a grace period.
1145 */
1146 restart:
1147 spin_lock(&sp->so_lock);
1148 list_for_each_entry(state, &sp->so_states, open_states) {
1149 if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
1150 continue;
1151 if (state->state == 0)
1152 continue;
1153 atomic_inc(&state->count);
1154 spin_unlock(&sp->so_lock);
1155 status = ops->recover_open(sp, state);
1156 if (status >= 0) {
1157 status = nfs4_reclaim_locks(state, ops);
1158 if (status >= 0) {
1159 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1160 if (!(lock->ls_flags & NFS_LOCK_INITIALIZED))
1161 printk("%s: Lock reclaim failed!\n",
1162 __func__);
1163 }
1164 nfs4_put_open_state(state);
1165 goto restart;
1166 }
1167 }
1168 switch (status) {
1169 default:
1170 printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n",
1171 __func__, status);
1172 case -ENOENT:
1173 case -ENOMEM:
1174 case -ESTALE:
1175 /*
1176 * Open state on this file cannot be recovered
1177 * All we can do is revert to using the zero stateid.
1178 */
1179 memset(state->stateid.data, 0,
1180 sizeof(state->stateid.data));
1181 /* Mark the file as being 'closed' */
1182 state->state = 0;
1183 break;
1184 case -EKEYEXPIRED:
1185 /*
1186 * User RPCSEC_GSS context has expired.
1187 * We cannot recover this stateid now, so
1188 * skip it and allow recovery thread to
1189 * proceed.
1190 */
1191 break;
1192 case -NFS4ERR_ADMIN_REVOKED:
1193 case -NFS4ERR_STALE_STATEID:
1194 case -NFS4ERR_BAD_STATEID:
1195 case -NFS4ERR_RECLAIM_BAD:
1196 case -NFS4ERR_RECLAIM_CONFLICT:
1197 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1198 break;
1199 case -NFS4ERR_EXPIRED:
1200 case -NFS4ERR_NO_GRACE:
1201 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1202 case -NFS4ERR_STALE_CLIENTID:
1203 case -NFS4ERR_BADSESSION:
1204 case -NFS4ERR_BADSLOT:
1205 case -NFS4ERR_BAD_HIGH_SLOT:
1206 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1207 goto out_err;
1208 }
1209 nfs4_put_open_state(state);
1210 goto restart;
1211 }
1212 spin_unlock(&sp->so_lock);
1213 return 0;
1214 out_err:
1215 nfs4_put_open_state(state);
1216 return status;
1217 }
1218
1219 static void nfs4_clear_open_state(struct nfs4_state *state)
1220 {
1221 struct nfs4_lock_state *lock;
1222
1223 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1224 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1225 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1226 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1227 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1228 lock->ls_seqid.flags = 0;
1229 lock->ls_flags &= ~NFS_LOCK_INITIALIZED;
1230 }
1231 }
1232
1233 static void nfs4_reset_seqids(struct nfs_server *server,
1234 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1235 {
1236 struct nfs_client *clp = server->nfs_client;
1237 struct nfs4_state_owner *sp;
1238 struct rb_node *pos;
1239 struct nfs4_state *state;
1240
1241 spin_lock(&clp->cl_lock);
1242 for (pos = rb_first(&server->state_owners);
1243 pos != NULL;
1244 pos = rb_next(pos)) {
1245 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1246 sp->so_seqid.flags = 0;
1247 spin_lock(&sp->so_lock);
1248 list_for_each_entry(state, &sp->so_states, open_states) {
1249 if (mark_reclaim(clp, state))
1250 nfs4_clear_open_state(state);
1251 }
1252 spin_unlock(&sp->so_lock);
1253 }
1254 spin_unlock(&clp->cl_lock);
1255 }
1256
1257 static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp,
1258 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1259 {
1260 struct nfs_server *server;
1261
1262 rcu_read_lock();
1263 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1264 nfs4_reset_seqids(server, mark_reclaim);
1265 rcu_read_unlock();
1266 }
1267
1268 static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
1269 {
1270 /* Mark all delegations for reclaim */
1271 nfs_delegation_mark_reclaim(clp);
1272 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot);
1273 }
1274
1275 static void nfs4_reclaim_complete(struct nfs_client *clp,
1276 const struct nfs4_state_recovery_ops *ops)
1277 {
1278 /* Notify the server we're done reclaiming our state */
1279 if (ops->reclaim_complete)
1280 (void)ops->reclaim_complete(clp);
1281 }
1282
1283 static void nfs4_clear_reclaim_server(struct nfs_server *server)
1284 {
1285 struct nfs_client *clp = server->nfs_client;
1286 struct nfs4_state_owner *sp;
1287 struct rb_node *pos;
1288 struct nfs4_state *state;
1289
1290 spin_lock(&clp->cl_lock);
1291 for (pos = rb_first(&server->state_owners);
1292 pos != NULL;
1293 pos = rb_next(pos)) {
1294 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1295 spin_lock(&sp->so_lock);
1296 list_for_each_entry(state, &sp->so_states, open_states) {
1297 if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT,
1298 &state->flags))
1299 continue;
1300 nfs4_state_mark_reclaim_nograce(clp, state);
1301 }
1302 spin_unlock(&sp->so_lock);
1303 }
1304 spin_unlock(&clp->cl_lock);
1305 }
1306
1307 static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp)
1308 {
1309 struct nfs_server *server;
1310
1311 if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1312 return 0;
1313
1314 rcu_read_lock();
1315 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1316 nfs4_clear_reclaim_server(server);
1317 rcu_read_unlock();
1318
1319 nfs_delegation_reap_unclaimed(clp);
1320 return 1;
1321 }
1322
1323 static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
1324 {
1325 if (!nfs4_state_clear_reclaim_reboot(clp))
1326 return;
1327 nfs4_reclaim_complete(clp, clp->cl_mvops->reboot_recovery_ops);
1328 }
1329
1330 static void nfs_delegation_clear_all(struct nfs_client *clp)
1331 {
1332 nfs_delegation_mark_reclaim(clp);
1333 nfs_delegation_reap_unclaimed(clp);
1334 }
1335
1336 static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
1337 {
1338 nfs_delegation_clear_all(clp);
1339 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
1340 }
1341
1342 static void nfs4_warn_keyexpired(const char *s)
1343 {
1344 printk_ratelimited(KERN_WARNING "Error: state manager"
1345 " encountered RPCSEC_GSS session"
1346 " expired against NFSv4 server %s.\n",
1347 s);
1348 }
1349
1350 static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
1351 {
1352 switch (error) {
1353 case -NFS4ERR_CB_PATH_DOWN:
1354 nfs_handle_cb_pathdown(clp);
1355 return 0;
1356 case -NFS4ERR_NO_GRACE:
1357 nfs4_state_end_reclaim_reboot(clp);
1358 return 0;
1359 case -NFS4ERR_STALE_CLIENTID:
1360 case -NFS4ERR_LEASE_MOVED:
1361 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1362 nfs4_state_clear_reclaim_reboot(clp);
1363 nfs4_state_start_reclaim_reboot(clp);
1364 break;
1365 case -NFS4ERR_EXPIRED:
1366 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1367 nfs4_state_start_reclaim_nograce(clp);
1368 break;
1369 case -NFS4ERR_BADSESSION:
1370 case -NFS4ERR_BADSLOT:
1371 case -NFS4ERR_BAD_HIGH_SLOT:
1372 case -NFS4ERR_DEADSESSION:
1373 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1374 case -NFS4ERR_SEQ_FALSE_RETRY:
1375 case -NFS4ERR_SEQ_MISORDERED:
1376 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1377 /* Zero session reset errors */
1378 return 0;
1379 case -EKEYEXPIRED:
1380 /* Nothing we can do */
1381 nfs4_warn_keyexpired(clp->cl_hostname);
1382 return 0;
1383 }
1384 return error;
1385 }
1386
1387 static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
1388 {
1389 struct nfs4_state_owner *sp;
1390 struct nfs_server *server;
1391 struct rb_node *pos;
1392 int status = 0;
1393
1394 restart:
1395 rcu_read_lock();
1396 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
1397 spin_lock(&clp->cl_lock);
1398 for (pos = rb_first(&server->state_owners);
1399 pos != NULL;
1400 pos = rb_next(pos)) {
1401 sp = rb_entry(pos,
1402 struct nfs4_state_owner, so_server_node);
1403 if (!test_and_clear_bit(ops->owner_flag_bit,
1404 &sp->so_flags))
1405 continue;
1406 atomic_inc(&sp->so_count);
1407 spin_unlock(&clp->cl_lock);
1408 rcu_read_unlock();
1409
1410 status = nfs4_reclaim_open_state(sp, ops);
1411 if (status < 0) {
1412 set_bit(ops->owner_flag_bit, &sp->so_flags);
1413 nfs4_put_state_owner(sp);
1414 return nfs4_recovery_handle_error(clp, status);
1415 }
1416
1417 nfs4_put_state_owner(sp);
1418 goto restart;
1419 }
1420 spin_unlock(&clp->cl_lock);
1421 }
1422 rcu_read_unlock();
1423 return status;
1424 }
1425
1426 static int nfs4_check_lease(struct nfs_client *clp)
1427 {
1428 struct rpc_cred *cred;
1429 const struct nfs4_state_maintenance_ops *ops =
1430 clp->cl_mvops->state_renewal_ops;
1431 int status = -NFS4ERR_EXPIRED;
1432
1433 /* Is the client already known to have an expired lease? */
1434 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1435 return 0;
1436 spin_lock(&clp->cl_lock);
1437 cred = ops->get_state_renewal_cred_locked(clp);
1438 spin_unlock(&clp->cl_lock);
1439 if (cred == NULL) {
1440 cred = nfs4_get_setclientid_cred(clp);
1441 if (cred == NULL)
1442 goto out;
1443 }
1444 status = ops->renew_lease(clp, cred);
1445 put_rpccred(cred);
1446 out:
1447 return nfs4_recovery_handle_error(clp, status);
1448 }
1449
1450 static int nfs4_reclaim_lease(struct nfs_client *clp)
1451 {
1452 struct rpc_cred *cred;
1453 const struct nfs4_state_recovery_ops *ops =
1454 clp->cl_mvops->reboot_recovery_ops;
1455 int status = -ENOENT;
1456
1457 cred = ops->get_clid_cred(clp);
1458 if (cred != NULL) {
1459 status = ops->establish_clid(clp, cred);
1460 put_rpccred(cred);
1461 /* Handle case where the user hasn't set up machine creds */
1462 if (status == -EACCES && cred == clp->cl_machine_cred) {
1463 nfs4_clear_machine_cred(clp);
1464 status = -EAGAIN;
1465 }
1466 if (status == -NFS4ERR_MINOR_VERS_MISMATCH)
1467 status = -EPROTONOSUPPORT;
1468 }
1469 return status;
1470 }
1471
1472 #ifdef CONFIG_NFS_V4_1
1473 void nfs4_schedule_session_recovery(struct nfs4_session *session)
1474 {
1475 struct nfs_client *clp = session->clp;
1476
1477 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1478 nfs4_schedule_lease_recovery(clp);
1479 }
1480 EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery);
1481
1482 void nfs41_handle_recall_slot(struct nfs_client *clp)
1483 {
1484 set_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state);
1485 nfs4_schedule_state_manager(clp);
1486 }
1487
1488 static void nfs4_reset_all_state(struct nfs_client *clp)
1489 {
1490 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
1491 clp->cl_boot_time = CURRENT_TIME;
1492 nfs4_state_start_reclaim_nograce(clp);
1493 nfs4_schedule_state_manager(clp);
1494 }
1495 }
1496
1497 static void nfs41_handle_server_reboot(struct nfs_client *clp)
1498 {
1499 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
1500 nfs4_state_start_reclaim_reboot(clp);
1501 nfs4_schedule_state_manager(clp);
1502 }
1503 }
1504
1505 static void nfs41_handle_state_revoked(struct nfs_client *clp)
1506 {
1507 /* Temporary */
1508 nfs4_reset_all_state(clp);
1509 }
1510
1511 static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp)
1512 {
1513 /* This will need to handle layouts too */
1514 nfs_expire_all_delegations(clp);
1515 }
1516
1517 static void nfs41_handle_cb_path_down(struct nfs_client *clp)
1518 {
1519 nfs_expire_all_delegations(clp);
1520 if (test_and_set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) == 0)
1521 nfs4_schedule_state_manager(clp);
1522 }
1523
1524 void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags)
1525 {
1526 if (!flags)
1527 return;
1528 else if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED)
1529 nfs41_handle_server_reboot(clp);
1530 else if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED |
1531 SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED |
1532 SEQ4_STATUS_ADMIN_STATE_REVOKED |
1533 SEQ4_STATUS_LEASE_MOVED))
1534 nfs41_handle_state_revoked(clp);
1535 else if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED)
1536 nfs41_handle_recallable_state_revoked(clp);
1537 else if (flags & (SEQ4_STATUS_CB_PATH_DOWN |
1538 SEQ4_STATUS_BACKCHANNEL_FAULT |
1539 SEQ4_STATUS_CB_PATH_DOWN_SESSION))
1540 nfs41_handle_cb_path_down(clp);
1541 }
1542
1543 static int nfs4_reset_session(struct nfs_client *clp)
1544 {
1545 int status;
1546
1547 nfs4_begin_drain_session(clp);
1548 status = nfs4_proc_destroy_session(clp->cl_session);
1549 if (status && status != -NFS4ERR_BADSESSION &&
1550 status != -NFS4ERR_DEADSESSION) {
1551 status = nfs4_recovery_handle_error(clp, status);
1552 goto out;
1553 }
1554
1555 memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
1556 status = nfs4_proc_create_session(clp);
1557 if (status) {
1558 status = nfs4_recovery_handle_error(clp, status);
1559 goto out;
1560 }
1561 clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1562 /* create_session negotiated new slot table */
1563 clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state);
1564
1565 /* Let the state manager reestablish state */
1566 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1567 nfs41_setup_state_renewal(clp);
1568 out:
1569 return status;
1570 }
1571
1572 static int nfs4_recall_slot(struct nfs_client *clp)
1573 {
1574 struct nfs4_slot_table *fc_tbl = &clp->cl_session->fc_slot_table;
1575 struct nfs4_channel_attrs *fc_attrs = &clp->cl_session->fc_attrs;
1576 struct nfs4_slot *new, *old;
1577 int i;
1578
1579 nfs4_begin_drain_session(clp);
1580 new = kmalloc(fc_tbl->target_max_slots * sizeof(struct nfs4_slot),
1581 GFP_NOFS);
1582 if (!new)
1583 return -ENOMEM;
1584
1585 spin_lock(&fc_tbl->slot_tbl_lock);
1586 for (i = 0; i < fc_tbl->target_max_slots; i++)
1587 new[i].seq_nr = fc_tbl->slots[i].seq_nr;
1588 old = fc_tbl->slots;
1589 fc_tbl->slots = new;
1590 fc_tbl->max_slots = fc_tbl->target_max_slots;
1591 fc_tbl->target_max_slots = 0;
1592 fc_attrs->max_reqs = fc_tbl->max_slots;
1593 spin_unlock(&fc_tbl->slot_tbl_lock);
1594
1595 kfree(old);
1596 nfs4_end_drain_session(clp);
1597 return 0;
1598 }
1599
1600 #else /* CONFIG_NFS_V4_1 */
1601 static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
1602 static int nfs4_end_drain_session(struct nfs_client *clp) { return 0; }
1603 static int nfs4_recall_slot(struct nfs_client *clp) { return 0; }
1604 #endif /* CONFIG_NFS_V4_1 */
1605
1606 /* Set NFS4CLNT_LEASE_EXPIRED for all v4.0 errors and for recoverable errors
1607 * on EXCHANGE_ID for v4.1
1608 */
1609 static void nfs4_set_lease_expired(struct nfs_client *clp, int status)
1610 {
1611 switch (status) {
1612 case -NFS4ERR_CLID_INUSE:
1613 case -NFS4ERR_STALE_CLIENTID:
1614 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1615 break;
1616 case -NFS4ERR_DELAY:
1617 case -ETIMEDOUT:
1618 case -EAGAIN:
1619 ssleep(1);
1620 break;
1621
1622 case -EKEYEXPIRED:
1623 nfs4_warn_keyexpired(clp->cl_hostname);
1624 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
1625 * in nfs4_exchange_id */
1626 default:
1627 return;
1628 }
1629 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1630 }
1631
1632 static void nfs4_state_manager(struct nfs_client *clp)
1633 {
1634 int status = 0;
1635
1636 /* Ensure exclusive access to NFSv4 state */
1637 do {
1638 if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
1639 /* We're going to have to re-establish a clientid */
1640 status = nfs4_reclaim_lease(clp);
1641 if (status) {
1642 nfs4_set_lease_expired(clp, status);
1643 if (test_bit(NFS4CLNT_LEASE_EXPIRED,
1644 &clp->cl_state))
1645 continue;
1646 if (clp->cl_cons_state ==
1647 NFS_CS_SESSION_INITING)
1648 nfs_mark_client_ready(clp, status);
1649 goto out_error;
1650 }
1651 clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1652
1653 if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH,
1654 &clp->cl_state))
1655 nfs4_state_start_reclaim_nograce(clp);
1656 else
1657 set_bit(NFS4CLNT_RECLAIM_REBOOT,
1658 &clp->cl_state);
1659
1660 pnfs_destroy_all_layouts(clp);
1661 }
1662
1663 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
1664 status = nfs4_check_lease(clp);
1665 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1666 continue;
1667 if (status < 0 && status != -NFS4ERR_CB_PATH_DOWN)
1668 goto out_error;
1669 }
1670
1671 /* Initialize or reset the session */
1672 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)
1673 && nfs4_has_session(clp)) {
1674 status = nfs4_reset_session(clp);
1675 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1676 continue;
1677 if (status < 0)
1678 goto out_error;
1679 }
1680
1681 /* First recover reboot state... */
1682 if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
1683 status = nfs4_do_reclaim(clp,
1684 clp->cl_mvops->reboot_recovery_ops);
1685 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
1686 test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
1687 continue;
1688 nfs4_state_end_reclaim_reboot(clp);
1689 if (test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
1690 continue;
1691 if (status < 0)
1692 goto out_error;
1693 }
1694
1695 /* Now recover expired state... */
1696 if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
1697 status = nfs4_do_reclaim(clp,
1698 clp->cl_mvops->nograce_recovery_ops);
1699 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
1700 test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) ||
1701 test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1702 continue;
1703 if (status < 0)
1704 goto out_error;
1705 }
1706
1707 nfs4_end_drain_session(clp);
1708 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
1709 nfs_client_return_marked_delegations(clp);
1710 continue;
1711 }
1712 /* Recall session slots */
1713 if (test_and_clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state)
1714 && nfs4_has_session(clp)) {
1715 status = nfs4_recall_slot(clp);
1716 if (status < 0)
1717 goto out_error;
1718 continue;
1719 }
1720
1721
1722 nfs4_clear_state_manager_bit(clp);
1723 /* Did we race with an attempt to give us more work? */
1724 if (clp->cl_state == 0)
1725 break;
1726 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1727 break;
1728 } while (atomic_read(&clp->cl_count) > 1);
1729 return;
1730 out_error:
1731 printk(KERN_WARNING "Error: state manager failed on NFSv4 server %s"
1732 " with error %d\n", clp->cl_hostname, -status);
1733 nfs4_end_drain_session(clp);
1734 nfs4_clear_state_manager_bit(clp);
1735 }
1736
1737 static int nfs4_run_state_manager(void *ptr)
1738 {
1739 struct nfs_client *clp = ptr;
1740
1741 allow_signal(SIGKILL);
1742 nfs4_state_manager(clp);
1743 nfs_put_client(clp);
1744 module_put_and_exit(0);
1745 return 0;
1746 }
1747
1748 /*
1749 * Local variables:
1750 * c-basic-offset: 8
1751 * End:
1752 */
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree