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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/smp_lock.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/workqueue.h> |
50 | #include <linux/bitops.h> |
51 | |
52 | #include "nfs4_fs.h" |
53 | #include "callback.h" |
54 | #include "delegation.h" |
55 | #include "internal.h" |
56 | |
57 | #define OPENOWNER_POOL_SIZE 8 |
58 | |
59 | const nfs4_stateid zero_stateid; |
60 | |
61 | static LIST_HEAD(nfs4_clientid_list); |
62 | |
63 | int nfs4_init_clientid(struct nfs_client *clp, struct rpc_cred *cred) |
64 | { |
65 | unsigned short port; |
66 | int status; |
67 | |
68 | port = nfs_callback_tcpport; |
69 | if (clp->cl_addr.ss_family == AF_INET6) |
70 | port = nfs_callback_tcpport6; |
71 | |
72 | status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred); |
73 | if (status == 0) |
74 | status = nfs4_proc_setclientid_confirm(clp, cred); |
75 | if (status == 0) |
76 | nfs4_schedule_state_renewal(clp); |
77 | return status; |
78 | } |
79 | |
80 | struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp) |
81 | { |
82 | struct rpc_cred *cred = NULL; |
83 | |
84 | if (clp->cl_machine_cred != NULL) |
85 | cred = get_rpccred(clp->cl_machine_cred); |
86 | return cred; |
87 | } |
88 | |
89 | static void nfs4_clear_machine_cred(struct nfs_client *clp) |
90 | { |
91 | struct rpc_cred *cred; |
92 | |
93 | spin_lock(&clp->cl_lock); |
94 | cred = clp->cl_machine_cred; |
95 | clp->cl_machine_cred = NULL; |
96 | spin_unlock(&clp->cl_lock); |
97 | if (cred != NULL) |
98 | put_rpccred(cred); |
99 | } |
100 | |
101 | struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp) |
102 | { |
103 | struct nfs4_state_owner *sp; |
104 | struct rb_node *pos; |
105 | struct rpc_cred *cred = NULL; |
106 | |
107 | for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) { |
108 | sp = rb_entry(pos, struct nfs4_state_owner, so_client_node); |
109 | if (list_empty(&sp->so_states)) |
110 | continue; |
111 | cred = get_rpccred(sp->so_cred); |
112 | break; |
113 | } |
114 | return cred; |
115 | } |
116 | |
117 | #if defined(CONFIG_NFS_V4_1) |
118 | |
119 | struct rpc_cred *nfs4_get_exchange_id_cred(struct nfs_client *clp) |
120 | { |
121 | struct rpc_cred *cred; |
122 | |
123 | spin_lock(&clp->cl_lock); |
124 | cred = nfs4_get_machine_cred_locked(clp); |
125 | spin_unlock(&clp->cl_lock); |
126 | return cred; |
127 | } |
128 | |
129 | #endif /* CONFIG_NFS_V4_1 */ |
130 | |
131 | struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp) |
132 | { |
133 | struct nfs4_state_owner *sp; |
134 | struct rb_node *pos; |
135 | struct rpc_cred *cred; |
136 | |
137 | spin_lock(&clp->cl_lock); |
138 | cred = nfs4_get_machine_cred_locked(clp); |
139 | if (cred != NULL) |
140 | goto out; |
141 | pos = rb_first(&clp->cl_state_owners); |
142 | if (pos != NULL) { |
143 | sp = rb_entry(pos, struct nfs4_state_owner, so_client_node); |
144 | cred = get_rpccred(sp->so_cred); |
145 | } |
146 | out: |
147 | spin_unlock(&clp->cl_lock); |
148 | return cred; |
149 | } |
150 | |
151 | static void nfs_alloc_unique_id(struct rb_root *root, struct nfs_unique_id *new, |
152 | __u64 minval, int maxbits) |
153 | { |
154 | struct rb_node **p, *parent; |
155 | struct nfs_unique_id *pos; |
156 | __u64 mask = ~0ULL; |
157 | |
158 | if (maxbits < 64) |
159 | mask = (1ULL << maxbits) - 1ULL; |
160 | |
161 | /* Ensure distribution is more or less flat */ |
162 | get_random_bytes(&new->id, sizeof(new->id)); |
163 | new->id &= mask; |
164 | if (new->id < minval) |
165 | new->id += minval; |
166 | retry: |
167 | p = &root->rb_node; |
168 | parent = NULL; |
169 | |
170 | while (*p != NULL) { |
171 | parent = *p; |
172 | pos = rb_entry(parent, struct nfs_unique_id, rb_node); |
173 | |
174 | if (new->id < pos->id) |
175 | p = &(*p)->rb_left; |
176 | else if (new->id > pos->id) |
177 | p = &(*p)->rb_right; |
178 | else |
179 | goto id_exists; |
180 | } |
181 | rb_link_node(&new->rb_node, parent, p); |
182 | rb_insert_color(&new->rb_node, root); |
183 | return; |
184 | id_exists: |
185 | for (;;) { |
186 | new->id++; |
187 | if (new->id < minval || (new->id & mask) != new->id) { |
188 | new->id = minval; |
189 | break; |
190 | } |
191 | parent = rb_next(parent); |
192 | if (parent == NULL) |
193 | break; |
194 | pos = rb_entry(parent, struct nfs_unique_id, rb_node); |
195 | if (new->id < pos->id) |
196 | break; |
197 | } |
198 | goto retry; |
199 | } |
200 | |
201 | static void nfs_free_unique_id(struct rb_root *root, struct nfs_unique_id *id) |
202 | { |
203 | rb_erase(&id->rb_node, root); |
204 | } |
205 | |
206 | static struct nfs4_state_owner * |
207 | nfs4_find_state_owner(struct nfs_server *server, struct rpc_cred *cred) |
208 | { |
209 | struct nfs_client *clp = server->nfs_client; |
210 | struct rb_node **p = &clp->cl_state_owners.rb_node, |
211 | *parent = NULL; |
212 | struct nfs4_state_owner *sp, *res = NULL; |
213 | |
214 | while (*p != NULL) { |
215 | parent = *p; |
216 | sp = rb_entry(parent, struct nfs4_state_owner, so_client_node); |
217 | |
218 | if (server < sp->so_server) { |
219 | p = &parent->rb_left; |
220 | continue; |
221 | } |
222 | if (server > sp->so_server) { |
223 | p = &parent->rb_right; |
224 | continue; |
225 | } |
226 | if (cred < sp->so_cred) |
227 | p = &parent->rb_left; |
228 | else if (cred > sp->so_cred) |
229 | p = &parent->rb_right; |
230 | else { |
231 | atomic_inc(&sp->so_count); |
232 | res = sp; |
233 | break; |
234 | } |
235 | } |
236 | return res; |
237 | } |
238 | |
239 | static struct nfs4_state_owner * |
240 | nfs4_insert_state_owner(struct nfs_client *clp, struct nfs4_state_owner *new) |
241 | { |
242 | struct rb_node **p = &clp->cl_state_owners.rb_node, |
243 | *parent = NULL; |
244 | struct nfs4_state_owner *sp; |
245 | |
246 | while (*p != NULL) { |
247 | parent = *p; |
248 | sp = rb_entry(parent, struct nfs4_state_owner, so_client_node); |
249 | |
250 | if (new->so_server < sp->so_server) { |
251 | p = &parent->rb_left; |
252 | continue; |
253 | } |
254 | if (new->so_server > sp->so_server) { |
255 | p = &parent->rb_right; |
256 | continue; |
257 | } |
258 | if (new->so_cred < sp->so_cred) |
259 | p = &parent->rb_left; |
260 | else if (new->so_cred > sp->so_cred) |
261 | p = &parent->rb_right; |
262 | else { |
263 | atomic_inc(&sp->so_count); |
264 | return sp; |
265 | } |
266 | } |
267 | nfs_alloc_unique_id(&clp->cl_openowner_id, &new->so_owner_id, 1, 64); |
268 | rb_link_node(&new->so_client_node, parent, p); |
269 | rb_insert_color(&new->so_client_node, &clp->cl_state_owners); |
270 | return new; |
271 | } |
272 | |
273 | static void |
274 | nfs4_remove_state_owner(struct nfs_client *clp, struct nfs4_state_owner *sp) |
275 | { |
276 | if (!RB_EMPTY_NODE(&sp->so_client_node)) |
277 | rb_erase(&sp->so_client_node, &clp->cl_state_owners); |
278 | nfs_free_unique_id(&clp->cl_openowner_id, &sp->so_owner_id); |
279 | } |
280 | |
281 | /* |
282 | * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to |
283 | * create a new state_owner. |
284 | * |
285 | */ |
286 | static struct nfs4_state_owner * |
287 | nfs4_alloc_state_owner(void) |
288 | { |
289 | struct nfs4_state_owner *sp; |
290 | |
291 | sp = kzalloc(sizeof(*sp),GFP_KERNEL); |
292 | if (!sp) |
293 | return NULL; |
294 | spin_lock_init(&sp->so_lock); |
295 | INIT_LIST_HEAD(&sp->so_states); |
296 | INIT_LIST_HEAD(&sp->so_delegations); |
297 | rpc_init_wait_queue(&sp->so_sequence.wait, "Seqid_waitqueue"); |
298 | sp->so_seqid.sequence = &sp->so_sequence; |
299 | spin_lock_init(&sp->so_sequence.lock); |
300 | INIT_LIST_HEAD(&sp->so_sequence.list); |
301 | atomic_set(&sp->so_count, 1); |
302 | return sp; |
303 | } |
304 | |
305 | static void |
306 | nfs4_drop_state_owner(struct nfs4_state_owner *sp) |
307 | { |
308 | if (!RB_EMPTY_NODE(&sp->so_client_node)) { |
309 | struct nfs_client *clp = sp->so_client; |
310 | |
311 | spin_lock(&clp->cl_lock); |
312 | rb_erase(&sp->so_client_node, &clp->cl_state_owners); |
313 | RB_CLEAR_NODE(&sp->so_client_node); |
314 | spin_unlock(&clp->cl_lock); |
315 | } |
316 | } |
317 | |
318 | struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server, struct rpc_cred *cred) |
319 | { |
320 | struct nfs_client *clp = server->nfs_client; |
321 | struct nfs4_state_owner *sp, *new; |
322 | |
323 | spin_lock(&clp->cl_lock); |
324 | sp = nfs4_find_state_owner(server, cred); |
325 | spin_unlock(&clp->cl_lock); |
326 | if (sp != NULL) |
327 | return sp; |
328 | new = nfs4_alloc_state_owner(); |
329 | if (new == NULL) |
330 | return NULL; |
331 | new->so_client = clp; |
332 | new->so_server = server; |
333 | new->so_cred = cred; |
334 | spin_lock(&clp->cl_lock); |
335 | sp = nfs4_insert_state_owner(clp, new); |
336 | spin_unlock(&clp->cl_lock); |
337 | if (sp == new) |
338 | get_rpccred(cred); |
339 | else { |
340 | rpc_destroy_wait_queue(&new->so_sequence.wait); |
341 | kfree(new); |
342 | } |
343 | return sp; |
344 | } |
345 | |
346 | void nfs4_put_state_owner(struct nfs4_state_owner *sp) |
347 | { |
348 | struct nfs_client *clp = sp->so_client; |
349 | struct rpc_cred *cred = sp->so_cred; |
350 | |
351 | if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock)) |
352 | return; |
353 | nfs4_remove_state_owner(clp, sp); |
354 | spin_unlock(&clp->cl_lock); |
355 | rpc_destroy_wait_queue(&sp->so_sequence.wait); |
356 | put_rpccred(cred); |
357 | kfree(sp); |
358 | } |
359 | |
360 | static struct nfs4_state * |
361 | nfs4_alloc_open_state(void) |
362 | { |
363 | struct nfs4_state *state; |
364 | |
365 | state = kzalloc(sizeof(*state), GFP_KERNEL); |
366 | if (!state) |
367 | return NULL; |
368 | atomic_set(&state->count, 1); |
369 | INIT_LIST_HEAD(&state->lock_states); |
370 | spin_lock_init(&state->state_lock); |
371 | seqlock_init(&state->seqlock); |
372 | return state; |
373 | } |
374 | |
375 | void |
376 | nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode) |
377 | { |
378 | if (state->state == fmode) |
379 | return; |
380 | /* NB! List reordering - see the reclaim code for why. */ |
381 | if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) { |
382 | if (fmode & FMODE_WRITE) |
383 | list_move(&state->open_states, &state->owner->so_states); |
384 | else |
385 | list_move_tail(&state->open_states, &state->owner->so_states); |
386 | } |
387 | state->state = fmode; |
388 | } |
389 | |
390 | static struct nfs4_state * |
391 | __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner) |
392 | { |
393 | struct nfs_inode *nfsi = NFS_I(inode); |
394 | struct nfs4_state *state; |
395 | |
396 | list_for_each_entry(state, &nfsi->open_states, inode_states) { |
397 | if (state->owner != owner) |
398 | continue; |
399 | if (atomic_inc_not_zero(&state->count)) |
400 | return state; |
401 | } |
402 | return NULL; |
403 | } |
404 | |
405 | static void |
406 | nfs4_free_open_state(struct nfs4_state *state) |
407 | { |
408 | kfree(state); |
409 | } |
410 | |
411 | struct nfs4_state * |
412 | nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner) |
413 | { |
414 | struct nfs4_state *state, *new; |
415 | struct nfs_inode *nfsi = NFS_I(inode); |
416 | |
417 | spin_lock(&inode->i_lock); |
418 | state = __nfs4_find_state_byowner(inode, owner); |
419 | spin_unlock(&inode->i_lock); |
420 | if (state) |
421 | goto out; |
422 | new = nfs4_alloc_open_state(); |
423 | spin_lock(&owner->so_lock); |
424 | spin_lock(&inode->i_lock); |
425 | state = __nfs4_find_state_byowner(inode, owner); |
426 | if (state == NULL && new != NULL) { |
427 | state = new; |
428 | state->owner = owner; |
429 | atomic_inc(&owner->so_count); |
430 | list_add(&state->inode_states, &nfsi->open_states); |
431 | state->inode = igrab(inode); |
432 | spin_unlock(&inode->i_lock); |
433 | /* Note: The reclaim code dictates that we add stateless |
434 | * and read-only stateids to the end of the list */ |
435 | list_add_tail(&state->open_states, &owner->so_states); |
436 | spin_unlock(&owner->so_lock); |
437 | } else { |
438 | spin_unlock(&inode->i_lock); |
439 | spin_unlock(&owner->so_lock); |
440 | if (new) |
441 | nfs4_free_open_state(new); |
442 | } |
443 | out: |
444 | return state; |
445 | } |
446 | |
447 | void nfs4_put_open_state(struct nfs4_state *state) |
448 | { |
449 | struct inode *inode = state->inode; |
450 | struct nfs4_state_owner *owner = state->owner; |
451 | |
452 | if (!atomic_dec_and_lock(&state->count, &owner->so_lock)) |
453 | return; |
454 | spin_lock(&inode->i_lock); |
455 | list_del(&state->inode_states); |
456 | list_del(&state->open_states); |
457 | spin_unlock(&inode->i_lock); |
458 | spin_unlock(&owner->so_lock); |
459 | iput(inode); |
460 | nfs4_free_open_state(state); |
461 | nfs4_put_state_owner(owner); |
462 | } |
463 | |
464 | /* |
465 | * Close the current file. |
466 | */ |
467 | static void __nfs4_close(struct path *path, struct nfs4_state *state, fmode_t fmode, int wait) |
468 | { |
469 | struct nfs4_state_owner *owner = state->owner; |
470 | int call_close = 0; |
471 | fmode_t newstate; |
472 | |
473 | atomic_inc(&owner->so_count); |
474 | /* Protect against nfs4_find_state() */ |
475 | spin_lock(&owner->so_lock); |
476 | switch (fmode & (FMODE_READ | FMODE_WRITE)) { |
477 | case FMODE_READ: |
478 | state->n_rdonly--; |
479 | break; |
480 | case FMODE_WRITE: |
481 | state->n_wronly--; |
482 | break; |
483 | case FMODE_READ|FMODE_WRITE: |
484 | state->n_rdwr--; |
485 | } |
486 | newstate = FMODE_READ|FMODE_WRITE; |
487 | if (state->n_rdwr == 0) { |
488 | if (state->n_rdonly == 0) { |
489 | newstate &= ~FMODE_READ; |
490 | call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags); |
491 | call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); |
492 | } |
493 | if (state->n_wronly == 0) { |
494 | newstate &= ~FMODE_WRITE; |
495 | call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags); |
496 | call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); |
497 | } |
498 | if (newstate == 0) |
499 | clear_bit(NFS_DELEGATED_STATE, &state->flags); |
500 | } |
501 | nfs4_state_set_mode_locked(state, newstate); |
502 | spin_unlock(&owner->so_lock); |
503 | |
504 | if (!call_close) { |
505 | nfs4_put_open_state(state); |
506 | nfs4_put_state_owner(owner); |
507 | } else |
508 | nfs4_do_close(path, state, wait); |
509 | } |
510 | |
511 | void nfs4_close_state(struct path *path, struct nfs4_state *state, fmode_t fmode) |
512 | { |
513 | __nfs4_close(path, state, fmode, 0); |
514 | } |
515 | |
516 | void nfs4_close_sync(struct path *path, struct nfs4_state *state, fmode_t fmode) |
517 | { |
518 | __nfs4_close(path, state, fmode, 1); |
519 | } |
520 | |
521 | /* |
522 | * Search the state->lock_states for an existing lock_owner |
523 | * that is compatible with current->files |
524 | */ |
525 | static struct nfs4_lock_state * |
526 | __nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner) |
527 | { |
528 | struct nfs4_lock_state *pos; |
529 | list_for_each_entry(pos, &state->lock_states, ls_locks) { |
530 | if (pos->ls_owner != fl_owner) |
531 | continue; |
532 | atomic_inc(&pos->ls_count); |
533 | return pos; |
534 | } |
535 | return NULL; |
536 | } |
537 | |
538 | /* |
539 | * Return a compatible lock_state. If no initialized lock_state structure |
540 | * exists, return an uninitialized one. |
541 | * |
542 | */ |
543 | static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner) |
544 | { |
545 | struct nfs4_lock_state *lsp; |
546 | struct nfs_client *clp = state->owner->so_client; |
547 | |
548 | lsp = kzalloc(sizeof(*lsp), GFP_KERNEL); |
549 | if (lsp == NULL) |
550 | return NULL; |
551 | rpc_init_wait_queue(&lsp->ls_sequence.wait, "lock_seqid_waitqueue"); |
552 | spin_lock_init(&lsp->ls_sequence.lock); |
553 | INIT_LIST_HEAD(&lsp->ls_sequence.list); |
554 | lsp->ls_seqid.sequence = &lsp->ls_sequence; |
555 | atomic_set(&lsp->ls_count, 1); |
556 | lsp->ls_state = state; |
557 | lsp->ls_owner = fl_owner; |
558 | spin_lock(&clp->cl_lock); |
559 | nfs_alloc_unique_id(&clp->cl_lockowner_id, &lsp->ls_id, 1, 64); |
560 | spin_unlock(&clp->cl_lock); |
561 | INIT_LIST_HEAD(&lsp->ls_locks); |
562 | return lsp; |
563 | } |
564 | |
565 | static void nfs4_free_lock_state(struct nfs4_lock_state *lsp) |
566 | { |
567 | struct nfs_client *clp = lsp->ls_state->owner->so_client; |
568 | |
569 | spin_lock(&clp->cl_lock); |
570 | nfs_free_unique_id(&clp->cl_lockowner_id, &lsp->ls_id); |
571 | spin_unlock(&clp->cl_lock); |
572 | rpc_destroy_wait_queue(&lsp->ls_sequence.wait); |
573 | kfree(lsp); |
574 | } |
575 | |
576 | /* |
577 | * Return a compatible lock_state. If no initialized lock_state structure |
578 | * exists, return an uninitialized one. |
579 | * |
580 | */ |
581 | static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner) |
582 | { |
583 | struct nfs4_lock_state *lsp, *new = NULL; |
584 | |
585 | for(;;) { |
586 | spin_lock(&state->state_lock); |
587 | lsp = __nfs4_find_lock_state(state, owner); |
588 | if (lsp != NULL) |
589 | break; |
590 | if (new != NULL) { |
591 | list_add(&new->ls_locks, &state->lock_states); |
592 | set_bit(LK_STATE_IN_USE, &state->flags); |
593 | lsp = new; |
594 | new = NULL; |
595 | break; |
596 | } |
597 | spin_unlock(&state->state_lock); |
598 | new = nfs4_alloc_lock_state(state, owner); |
599 | if (new == NULL) |
600 | return NULL; |
601 | } |
602 | spin_unlock(&state->state_lock); |
603 | if (new != NULL) |
604 | nfs4_free_lock_state(new); |
605 | return lsp; |
606 | } |
607 | |
608 | /* |
609 | * Release reference to lock_state, and free it if we see that |
610 | * it is no longer in use |
611 | */ |
612 | void nfs4_put_lock_state(struct nfs4_lock_state *lsp) |
613 | { |
614 | struct nfs4_state *state; |
615 | |
616 | if (lsp == NULL) |
617 | return; |
618 | state = lsp->ls_state; |
619 | if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock)) |
620 | return; |
621 | list_del(&lsp->ls_locks); |
622 | if (list_empty(&state->lock_states)) |
623 | clear_bit(LK_STATE_IN_USE, &state->flags); |
624 | spin_unlock(&state->state_lock); |
625 | nfs4_free_lock_state(lsp); |
626 | } |
627 | |
628 | static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src) |
629 | { |
630 | struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner; |
631 | |
632 | dst->fl_u.nfs4_fl.owner = lsp; |
633 | atomic_inc(&lsp->ls_count); |
634 | } |
635 | |
636 | static void nfs4_fl_release_lock(struct file_lock *fl) |
637 | { |
638 | nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner); |
639 | } |
640 | |
641 | static struct file_lock_operations nfs4_fl_lock_ops = { |
642 | .fl_copy_lock = nfs4_fl_copy_lock, |
643 | .fl_release_private = nfs4_fl_release_lock, |
644 | }; |
645 | |
646 | int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl) |
647 | { |
648 | struct nfs4_lock_state *lsp; |
649 | |
650 | if (fl->fl_ops != NULL) |
651 | return 0; |
652 | lsp = nfs4_get_lock_state(state, fl->fl_owner); |
653 | if (lsp == NULL) |
654 | return -ENOMEM; |
655 | fl->fl_u.nfs4_fl.owner = lsp; |
656 | fl->fl_ops = &nfs4_fl_lock_ops; |
657 | return 0; |
658 | } |
659 | |
660 | /* |
661 | * Byte-range lock aware utility to initialize the stateid of read/write |
662 | * requests. |
663 | */ |
664 | void nfs4_copy_stateid(nfs4_stateid *dst, struct nfs4_state *state, fl_owner_t fl_owner) |
665 | { |
666 | struct nfs4_lock_state *lsp; |
667 | int seq; |
668 | |
669 | do { |
670 | seq = read_seqbegin(&state->seqlock); |
671 | memcpy(dst, &state->stateid, sizeof(*dst)); |
672 | } while (read_seqretry(&state->seqlock, seq)); |
673 | if (test_bit(LK_STATE_IN_USE, &state->flags) == 0) |
674 | return; |
675 | |
676 | spin_lock(&state->state_lock); |
677 | lsp = __nfs4_find_lock_state(state, fl_owner); |
678 | if (lsp != NULL && (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0) |
679 | memcpy(dst, &lsp->ls_stateid, sizeof(*dst)); |
680 | spin_unlock(&state->state_lock); |
681 | nfs4_put_lock_state(lsp); |
682 | } |
683 | |
684 | struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter) |
685 | { |
686 | struct nfs_seqid *new; |
687 | |
688 | new = kmalloc(sizeof(*new), GFP_KERNEL); |
689 | if (new != NULL) { |
690 | new->sequence = counter; |
691 | INIT_LIST_HEAD(&new->list); |
692 | } |
693 | return new; |
694 | } |
695 | |
696 | void nfs_free_seqid(struct nfs_seqid *seqid) |
697 | { |
698 | if (!list_empty(&seqid->list)) { |
699 | struct rpc_sequence *sequence = seqid->sequence->sequence; |
700 | |
701 | spin_lock(&sequence->lock); |
702 | list_del(&seqid->list); |
703 | spin_unlock(&sequence->lock); |
704 | rpc_wake_up(&sequence->wait); |
705 | } |
706 | kfree(seqid); |
707 | } |
708 | |
709 | /* |
710 | * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or |
711 | * failed with a seqid incrementing error - |
712 | * see comments nfs_fs.h:seqid_mutating_error() |
713 | */ |
714 | static void nfs_increment_seqid(int status, struct nfs_seqid *seqid) |
715 | { |
716 | BUG_ON(list_first_entry(&seqid->sequence->sequence->list, struct nfs_seqid, list) != seqid); |
717 | switch (status) { |
718 | case 0: |
719 | break; |
720 | case -NFS4ERR_BAD_SEQID: |
721 | if (seqid->sequence->flags & NFS_SEQID_CONFIRMED) |
722 | return; |
723 | printk(KERN_WARNING "NFS: v4 server returned a bad" |
724 | " sequence-id error on an" |
725 | " unconfirmed sequence %p!\n", |
726 | seqid->sequence); |
727 | case -NFS4ERR_STALE_CLIENTID: |
728 | case -NFS4ERR_STALE_STATEID: |
729 | case -NFS4ERR_BAD_STATEID: |
730 | case -NFS4ERR_BADXDR: |
731 | case -NFS4ERR_RESOURCE: |
732 | case -NFS4ERR_NOFILEHANDLE: |
733 | /* Non-seqid mutating errors */ |
734 | return; |
735 | }; |
736 | /* |
737 | * Note: no locking needed as we are guaranteed to be first |
738 | * on the sequence list |
739 | */ |
740 | seqid->sequence->counter++; |
741 | } |
742 | |
743 | void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid) |
744 | { |
745 | struct nfs4_state_owner *sp = container_of(seqid->sequence, |
746 | struct nfs4_state_owner, so_seqid); |
747 | struct nfs_server *server = sp->so_server; |
748 | |
749 | if (status == -NFS4ERR_BAD_SEQID) |
750 | nfs4_drop_state_owner(sp); |
751 | if (!nfs4_has_session(server->nfs_client)) |
752 | nfs_increment_seqid(status, seqid); |
753 | } |
754 | |
755 | /* |
756 | * Increment the seqid if the LOCK/LOCKU succeeded, or |
757 | * failed with a seqid incrementing error - |
758 | * see comments nfs_fs.h:seqid_mutating_error() |
759 | */ |
760 | void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid) |
761 | { |
762 | nfs_increment_seqid(status, seqid); |
763 | } |
764 | |
765 | int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task) |
766 | { |
767 | struct rpc_sequence *sequence = seqid->sequence->sequence; |
768 | int status = 0; |
769 | |
770 | spin_lock(&sequence->lock); |
771 | if (list_empty(&seqid->list)) |
772 | list_add_tail(&seqid->list, &sequence->list); |
773 | if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid) |
774 | goto unlock; |
775 | rpc_sleep_on(&sequence->wait, task, NULL); |
776 | status = -EAGAIN; |
777 | unlock: |
778 | spin_unlock(&sequence->lock); |
779 | return status; |
780 | } |
781 | |
782 | static int nfs4_run_state_manager(void *); |
783 | |
784 | static void nfs4_clear_state_manager_bit(struct nfs_client *clp) |
785 | { |
786 | smp_mb__before_clear_bit(); |
787 | clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state); |
788 | smp_mb__after_clear_bit(); |
789 | wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING); |
790 | rpc_wake_up(&clp->cl_rpcwaitq); |
791 | } |
792 | |
793 | /* |
794 | * Schedule the nfs_client asynchronous state management routine |
795 | */ |
796 | void nfs4_schedule_state_manager(struct nfs_client *clp) |
797 | { |
798 | struct task_struct *task; |
799 | |
800 | if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0) |
801 | return; |
802 | __module_get(THIS_MODULE); |
803 | atomic_inc(&clp->cl_count); |
804 | task = kthread_run(nfs4_run_state_manager, clp, "%s-manager", |
805 | rpc_peeraddr2str(clp->cl_rpcclient, |
806 | RPC_DISPLAY_ADDR)); |
807 | if (!IS_ERR(task)) |
808 | return; |
809 | nfs4_clear_state_manager_bit(clp); |
810 | nfs_put_client(clp); |
811 | module_put(THIS_MODULE); |
812 | } |
813 | |
814 | /* |
815 | * Schedule a state recovery attempt |
816 | */ |
817 | void nfs4_schedule_state_recovery(struct nfs_client *clp) |
818 | { |
819 | if (!clp) |
820 | return; |
821 | if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) |
822 | set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); |
823 | nfs4_schedule_state_manager(clp); |
824 | } |
825 | |
826 | static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state) |
827 | { |
828 | |
829 | set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); |
830 | /* Don't recover state that expired before the reboot */ |
831 | if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) { |
832 | clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); |
833 | return 0; |
834 | } |
835 | set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags); |
836 | set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state); |
837 | return 1; |
838 | } |
839 | |
840 | int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state) |
841 | { |
842 | set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags); |
843 | clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); |
844 | set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags); |
845 | set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state); |
846 | return 1; |
847 | } |
848 | |
849 | static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops) |
850 | { |
851 | struct inode *inode = state->inode; |
852 | struct nfs_inode *nfsi = NFS_I(inode); |
853 | struct file_lock *fl; |
854 | int status = 0; |
855 | |
856 | if (inode->i_flock == NULL) |
857 | return 0; |
858 | |
859 | /* Guard against delegation returns and new lock/unlock calls */ |
860 | down_write(&nfsi->rwsem); |
861 | /* Protect inode->i_flock using the BKL */ |
862 | lock_kernel(); |
863 | for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) { |
864 | if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK))) |
865 | continue; |
866 | if (nfs_file_open_context(fl->fl_file)->state != state) |
867 | continue; |
868 | unlock_kernel(); |
869 | status = ops->recover_lock(state, fl); |
870 | switch (status) { |
871 | case 0: |
872 | break; |
873 | case -ESTALE: |
874 | case -NFS4ERR_ADMIN_REVOKED: |
875 | case -NFS4ERR_STALE_STATEID: |
876 | case -NFS4ERR_BAD_STATEID: |
877 | case -NFS4ERR_EXPIRED: |
878 | case -NFS4ERR_NO_GRACE: |
879 | case -NFS4ERR_STALE_CLIENTID: |
880 | goto out; |
881 | default: |
882 | printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n", |
883 | __func__, status); |
884 | case -ENOMEM: |
885 | case -NFS4ERR_DENIED: |
886 | case -NFS4ERR_RECLAIM_BAD: |
887 | case -NFS4ERR_RECLAIM_CONFLICT: |
888 | /* kill_proc(fl->fl_pid, SIGLOST, 1); */ |
889 | status = 0; |
890 | } |
891 | lock_kernel(); |
892 | } |
893 | unlock_kernel(); |
894 | out: |
895 | up_write(&nfsi->rwsem); |
896 | return status; |
897 | } |
898 | |
899 | static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops) |
900 | { |
901 | struct nfs4_state *state; |
902 | struct nfs4_lock_state *lock; |
903 | int status = 0; |
904 | |
905 | /* Note: we rely on the sp->so_states list being ordered |
906 | * so that we always reclaim open(O_RDWR) and/or open(O_WRITE) |
907 | * states first. |
908 | * This is needed to ensure that the server won't give us any |
909 | * read delegations that we have to return if, say, we are |
910 | * recovering after a network partition or a reboot from a |
911 | * server that doesn't support a grace period. |
912 | */ |
913 | restart: |
914 | spin_lock(&sp->so_lock); |
915 | list_for_each_entry(state, &sp->so_states, open_states) { |
916 | if (!test_and_clear_bit(ops->state_flag_bit, &state->flags)) |
917 | continue; |
918 | if (state->state == 0) |
919 | continue; |
920 | atomic_inc(&state->count); |
921 | spin_unlock(&sp->so_lock); |
922 | status = ops->recover_open(sp, state); |
923 | if (status >= 0) { |
924 | status = nfs4_reclaim_locks(state, ops); |
925 | if (status >= 0) { |
926 | list_for_each_entry(lock, &state->lock_states, ls_locks) { |
927 | if (!(lock->ls_flags & NFS_LOCK_INITIALIZED)) |
928 | printk("%s: Lock reclaim failed!\n", |
929 | __func__); |
930 | } |
931 | nfs4_put_open_state(state); |
932 | goto restart; |
933 | } |
934 | } |
935 | switch (status) { |
936 | default: |
937 | printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n", |
938 | __func__, status); |
939 | case -ENOENT: |
940 | case -ENOMEM: |
941 | case -ESTALE: |
942 | /* |
943 | * Open state on this file cannot be recovered |
944 | * All we can do is revert to using the zero stateid. |
945 | */ |
946 | memset(state->stateid.data, 0, |
947 | sizeof(state->stateid.data)); |
948 | /* Mark the file as being 'closed' */ |
949 | state->state = 0; |
950 | break; |
951 | case -NFS4ERR_ADMIN_REVOKED: |
952 | case -NFS4ERR_STALE_STATEID: |
953 | case -NFS4ERR_BAD_STATEID: |
954 | case -NFS4ERR_RECLAIM_BAD: |
955 | case -NFS4ERR_RECLAIM_CONFLICT: |
956 | nfs4_state_mark_reclaim_nograce(sp->so_client, state); |
957 | break; |
958 | case -NFS4ERR_EXPIRED: |
959 | case -NFS4ERR_NO_GRACE: |
960 | nfs4_state_mark_reclaim_nograce(sp->so_client, state); |
961 | case -NFS4ERR_STALE_CLIENTID: |
962 | goto out_err; |
963 | } |
964 | nfs4_put_open_state(state); |
965 | goto restart; |
966 | } |
967 | spin_unlock(&sp->so_lock); |
968 | return 0; |
969 | out_err: |
970 | nfs4_put_open_state(state); |
971 | return status; |
972 | } |
973 | |
974 | static void nfs4_clear_open_state(struct nfs4_state *state) |
975 | { |
976 | struct nfs4_lock_state *lock; |
977 | |
978 | clear_bit(NFS_DELEGATED_STATE, &state->flags); |
979 | clear_bit(NFS_O_RDONLY_STATE, &state->flags); |
980 | clear_bit(NFS_O_WRONLY_STATE, &state->flags); |
981 | clear_bit(NFS_O_RDWR_STATE, &state->flags); |
982 | list_for_each_entry(lock, &state->lock_states, ls_locks) { |
983 | lock->ls_seqid.flags = 0; |
984 | lock->ls_flags &= ~NFS_LOCK_INITIALIZED; |
985 | } |
986 | } |
987 | |
988 | static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp, int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state)) |
989 | { |
990 | struct nfs4_state_owner *sp; |
991 | struct rb_node *pos; |
992 | struct nfs4_state *state; |
993 | |
994 | /* Reset all sequence ids to zero */ |
995 | for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) { |
996 | sp = rb_entry(pos, struct nfs4_state_owner, so_client_node); |
997 | sp->so_seqid.flags = 0; |
998 | spin_lock(&sp->so_lock); |
999 | list_for_each_entry(state, &sp->so_states, open_states) { |
1000 | if (mark_reclaim(clp, state)) |
1001 | nfs4_clear_open_state(state); |
1002 | } |
1003 | spin_unlock(&sp->so_lock); |
1004 | } |
1005 | } |
1006 | |
1007 | static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp) |
1008 | { |
1009 | /* Mark all delegations for reclaim */ |
1010 | nfs_delegation_mark_reclaim(clp); |
1011 | nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot); |
1012 | } |
1013 | |
1014 | static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp) |
1015 | { |
1016 | struct nfs4_state_owner *sp; |
1017 | struct rb_node *pos; |
1018 | struct nfs4_state *state; |
1019 | |
1020 | if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) |
1021 | return; |
1022 | |
1023 | for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) { |
1024 | sp = rb_entry(pos, struct nfs4_state_owner, so_client_node); |
1025 | spin_lock(&sp->so_lock); |
1026 | list_for_each_entry(state, &sp->so_states, open_states) { |
1027 | if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags)) |
1028 | continue; |
1029 | nfs4_state_mark_reclaim_nograce(clp, state); |
1030 | } |
1031 | spin_unlock(&sp->so_lock); |
1032 | } |
1033 | |
1034 | nfs_delegation_reap_unclaimed(clp); |
1035 | } |
1036 | |
1037 | static void nfs_delegation_clear_all(struct nfs_client *clp) |
1038 | { |
1039 | nfs_delegation_mark_reclaim(clp); |
1040 | nfs_delegation_reap_unclaimed(clp); |
1041 | } |
1042 | |
1043 | static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp) |
1044 | { |
1045 | nfs_delegation_clear_all(clp); |
1046 | nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce); |
1047 | } |
1048 | |
1049 | static void nfs4_state_end_reclaim_nograce(struct nfs_client *clp) |
1050 | { |
1051 | clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state); |
1052 | } |
1053 | |
1054 | static void nfs4_recovery_handle_error(struct nfs_client *clp, int error) |
1055 | { |
1056 | switch (error) { |
1057 | case -NFS4ERR_CB_PATH_DOWN: |
1058 | nfs_handle_cb_pathdown(clp); |
1059 | break; |
1060 | case -NFS4ERR_STALE_CLIENTID: |
1061 | case -NFS4ERR_LEASE_MOVED: |
1062 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); |
1063 | nfs4_state_start_reclaim_reboot(clp); |
1064 | break; |
1065 | case -NFS4ERR_EXPIRED: |
1066 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); |
1067 | nfs4_state_start_reclaim_nograce(clp); |
1068 | case -NFS4ERR_BADSESSION: |
1069 | case -NFS4ERR_BADSLOT: |
1070 | case -NFS4ERR_BAD_HIGH_SLOT: |
1071 | case -NFS4ERR_DEADSESSION: |
1072 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: |
1073 | case -NFS4ERR_SEQ_FALSE_RETRY: |
1074 | case -NFS4ERR_SEQ_MISORDERED: |
1075 | set_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state); |
1076 | } |
1077 | } |
1078 | |
1079 | static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops) |
1080 | { |
1081 | struct rb_node *pos; |
1082 | int status = 0; |
1083 | |
1084 | restart: |
1085 | spin_lock(&clp->cl_lock); |
1086 | for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) { |
1087 | struct nfs4_state_owner *sp = rb_entry(pos, struct nfs4_state_owner, so_client_node); |
1088 | if (!test_and_clear_bit(ops->owner_flag_bit, &sp->so_flags)) |
1089 | continue; |
1090 | atomic_inc(&sp->so_count); |
1091 | spin_unlock(&clp->cl_lock); |
1092 | status = nfs4_reclaim_open_state(sp, ops); |
1093 | if (status < 0) { |
1094 | set_bit(ops->owner_flag_bit, &sp->so_flags); |
1095 | nfs4_put_state_owner(sp); |
1096 | nfs4_recovery_handle_error(clp, status); |
1097 | return status; |
1098 | } |
1099 | nfs4_put_state_owner(sp); |
1100 | goto restart; |
1101 | } |
1102 | spin_unlock(&clp->cl_lock); |
1103 | return status; |
1104 | } |
1105 | |
1106 | static int nfs4_check_lease(struct nfs_client *clp) |
1107 | { |
1108 | struct rpc_cred *cred; |
1109 | struct nfs4_state_maintenance_ops *ops = |
1110 | nfs4_state_renewal_ops[clp->cl_minorversion]; |
1111 | int status = -NFS4ERR_EXPIRED; |
1112 | |
1113 | /* Is the client already known to have an expired lease? */ |
1114 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) |
1115 | return 0; |
1116 | spin_lock(&clp->cl_lock); |
1117 | cred = ops->get_state_renewal_cred_locked(clp); |
1118 | spin_unlock(&clp->cl_lock); |
1119 | if (cred == NULL) { |
1120 | cred = nfs4_get_setclientid_cred(clp); |
1121 | if (cred == NULL) |
1122 | goto out; |
1123 | } |
1124 | status = ops->renew_lease(clp, cred); |
1125 | put_rpccred(cred); |
1126 | out: |
1127 | nfs4_recovery_handle_error(clp, status); |
1128 | return status; |
1129 | } |
1130 | |
1131 | static int nfs4_reclaim_lease(struct nfs_client *clp) |
1132 | { |
1133 | struct rpc_cred *cred; |
1134 | struct nfs4_state_recovery_ops *ops = |
1135 | nfs4_reboot_recovery_ops[clp->cl_minorversion]; |
1136 | int status = -ENOENT; |
1137 | |
1138 | cred = ops->get_clid_cred(clp); |
1139 | if (cred != NULL) { |
1140 | status = ops->establish_clid(clp, cred); |
1141 | put_rpccred(cred); |
1142 | /* Handle case where the user hasn't set up machine creds */ |
1143 | if (status == -EACCES && cred == clp->cl_machine_cred) { |
1144 | nfs4_clear_machine_cred(clp); |
1145 | status = -EAGAIN; |
1146 | } |
1147 | if (status == -NFS4ERR_MINOR_VERS_MISMATCH) |
1148 | status = -EPROTONOSUPPORT; |
1149 | } |
1150 | return status; |
1151 | } |
1152 | |
1153 | #ifdef CONFIG_NFS_V4_1 |
1154 | static void nfs4_session_recovery_handle_error(struct nfs_client *clp, int err) |
1155 | { |
1156 | switch (err) { |
1157 | case -NFS4ERR_STALE_CLIENTID: |
1158 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); |
1159 | set_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state); |
1160 | } |
1161 | } |
1162 | |
1163 | static int nfs4_reset_session(struct nfs_client *clp) |
1164 | { |
1165 | int status; |
1166 | |
1167 | status = nfs4_proc_destroy_session(clp->cl_session); |
1168 | if (status && status != -NFS4ERR_BADSESSION && |
1169 | status != -NFS4ERR_DEADSESSION) { |
1170 | nfs4_session_recovery_handle_error(clp, status); |
1171 | goto out; |
1172 | } |
1173 | |
1174 | memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN); |
1175 | status = nfs4_proc_create_session(clp, 1); |
1176 | if (status) |
1177 | nfs4_session_recovery_handle_error(clp, status); |
1178 | /* fall through*/ |
1179 | out: |
1180 | /* Wake up the next rpc task even on error */ |
1181 | rpc_wake_up_next(&clp->cl_session->fc_slot_table.slot_tbl_waitq); |
1182 | return status; |
1183 | } |
1184 | |
1185 | static int nfs4_initialize_session(struct nfs_client *clp) |
1186 | { |
1187 | int status; |
1188 | |
1189 | status = nfs4_proc_create_session(clp, 0); |
1190 | if (!status) { |
1191 | nfs_mark_client_ready(clp, NFS_CS_READY); |
1192 | } else if (status == -NFS4ERR_STALE_CLIENTID) { |
1193 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); |
1194 | set_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state); |
1195 | } else { |
1196 | nfs_mark_client_ready(clp, status); |
1197 | } |
1198 | return status; |
1199 | } |
1200 | #else /* CONFIG_NFS_V4_1 */ |
1201 | static int nfs4_reset_session(struct nfs_client *clp) { return 0; } |
1202 | static int nfs4_initialize_session(struct nfs_client *clp) { return 0; } |
1203 | #endif /* CONFIG_NFS_V4_1 */ |
1204 | |
1205 | /* Set NFS4CLNT_LEASE_EXPIRED for all v4.0 errors and for recoverable errors |
1206 | * on EXCHANGE_ID for v4.1 |
1207 | */ |
1208 | static void nfs4_set_lease_expired(struct nfs_client *clp, int status) |
1209 | { |
1210 | if (nfs4_has_session(clp)) { |
1211 | switch (status) { |
1212 | case -NFS4ERR_DELAY: |
1213 | case -NFS4ERR_CLID_INUSE: |
1214 | case -EAGAIN: |
1215 | break; |
1216 | |
1217 | case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery |
1218 | * in nfs4_exchange_id */ |
1219 | default: |
1220 | return; |
1221 | } |
1222 | } |
1223 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); |
1224 | } |
1225 | |
1226 | static void nfs4_state_manager(struct nfs_client *clp) |
1227 | { |
1228 | int status = 0; |
1229 | |
1230 | /* Ensure exclusive access to NFSv4 state */ |
1231 | for(;;) { |
1232 | if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) { |
1233 | /* We're going to have to re-establish a clientid */ |
1234 | status = nfs4_reclaim_lease(clp); |
1235 | if (status) { |
1236 | nfs4_set_lease_expired(clp, status); |
1237 | if (status == -EAGAIN) |
1238 | continue; |
1239 | if (clp->cl_cons_state == |
1240 | NFS_CS_SESSION_INITING) |
1241 | nfs_mark_client_ready(clp, status); |
1242 | goto out_error; |
1243 | } |
1244 | clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); |
1245 | } |
1246 | |
1247 | if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) { |
1248 | status = nfs4_check_lease(clp); |
1249 | if (status != 0) |
1250 | continue; |
1251 | } |
1252 | /* Initialize or reset the session */ |
1253 | if (test_and_clear_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state) |
1254 | && nfs4_has_session(clp)) { |
1255 | if (clp->cl_cons_state == NFS_CS_SESSION_INITING) |
1256 | status = nfs4_initialize_session(clp); |
1257 | else |
1258 | status = nfs4_reset_session(clp); |
1259 | if (status) { |
1260 | if (status == -NFS4ERR_STALE_CLIENTID) |
1261 | continue; |
1262 | goto out_error; |
1263 | } |
1264 | } |
1265 | /* First recover reboot state... */ |
1266 | if (test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) { |
1267 | status = nfs4_do_reclaim(clp, |
1268 | nfs4_reboot_recovery_ops[clp->cl_minorversion]); |
1269 | if (status == -NFS4ERR_STALE_CLIENTID) |
1270 | continue; |
1271 | if (test_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state)) |
1272 | continue; |
1273 | nfs4_state_end_reclaim_reboot(clp); |
1274 | continue; |
1275 | } |
1276 | |
1277 | /* Now recover expired state... */ |
1278 | if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) { |
1279 | status = nfs4_do_reclaim(clp, |
1280 | nfs4_nograce_recovery_ops[clp->cl_minorversion]); |
1281 | if (status < 0) { |
1282 | set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state); |
1283 | if (status == -NFS4ERR_STALE_CLIENTID) |
1284 | continue; |
1285 | if (status == -NFS4ERR_EXPIRED) |
1286 | continue; |
1287 | if (test_bit(NFS4CLNT_SESSION_SETUP, |
1288 | &clp->cl_state)) |
1289 | continue; |
1290 | goto out_error; |
1291 | } else |
1292 | nfs4_state_end_reclaim_nograce(clp); |
1293 | continue; |
1294 | } |
1295 | |
1296 | if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) { |
1297 | nfs_client_return_marked_delegations(clp); |
1298 | continue; |
1299 | } |
1300 | |
1301 | nfs4_clear_state_manager_bit(clp); |
1302 | /* Did we race with an attempt to give us more work? */ |
1303 | if (clp->cl_state == 0) |
1304 | break; |
1305 | if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0) |
1306 | break; |
1307 | } |
1308 | return; |
1309 | out_error: |
1310 | printk(KERN_WARNING "Error: state manager failed on NFSv4 server %s" |
1311 | " with error %d\n", clp->cl_hostname, -status); |
1312 | if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) |
1313 | nfs4_state_end_reclaim_reboot(clp); |
1314 | nfs4_clear_state_manager_bit(clp); |
1315 | } |
1316 | |
1317 | static int nfs4_run_state_manager(void *ptr) |
1318 | { |
1319 | struct nfs_client *clp = ptr; |
1320 | |
1321 | allow_signal(SIGKILL); |
1322 | nfs4_state_manager(clp); |
1323 | nfs_put_client(clp); |
1324 | module_put_and_exit(0); |
1325 | return 0; |
1326 | } |
1327 | |
1328 | /* |
1329 | * Local variables: |
1330 | * c-basic-offset: 8 |
1331 | * End: |
1332 | */ |
1333 |
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v2.6.34-rc5
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