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Commit | Line | Data |
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1da177e4 LT |
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 | ||
6f43ddcc | 41 | #include <linux/kernel.h> |
1da177e4 LT |
42 | #include <linux/slab.h> |
43 | #include <linux/smp_lock.h> | |
44 | #include <linux/nfs_fs.h> | |
45 | #include <linux/nfs_idmap.h> | |
5043e900 TM |
46 | #include <linux/kthread.h> |
47 | #include <linux/module.h> | |
9f958ab8 | 48 | #include <linux/random.h> |
1da177e4 LT |
49 | #include <linux/workqueue.h> |
50 | #include <linux/bitops.h> | |
51 | ||
4ce79717 | 52 | #include "nfs4_fs.h" |
1da177e4 LT |
53 | #include "callback.h" |
54 | #include "delegation.h" | |
24c8dbbb | 55 | #include "internal.h" |
1da177e4 LT |
56 | |
57 | #define OPENOWNER_POOL_SIZE 8 | |
58 | ||
4ce79717 | 59 | const nfs4_stateid zero_stateid; |
1da177e4 LT |
60 | |
61 | static LIST_HEAD(nfs4_clientid_list); | |
62 | ||
591d71cb | 63 | int nfs4_init_clientid(struct nfs_client *clp, struct rpc_cred *cred) |
1da177e4 | 64 | { |
f738f517 CL |
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); | |
1da177e4 | 73 | if (status == 0) |
286d7d6a | 74 | status = nfs4_proc_setclientid_confirm(clp, cred); |
1da177e4 LT |
75 | if (status == 0) |
76 | nfs4_schedule_state_renewal(clp); | |
77 | return status; | |
78 | } | |
79 | ||
a7b72103 | 80 | struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp) |
a2b2bb88 TM |
81 | { |
82 | struct rpc_cred *cred = NULL; | |
83 | ||
a2b2bb88 TM |
84 | if (clp->cl_machine_cred != NULL) |
85 | cred = get_rpccred(clp->cl_machine_cred); | |
a2b2bb88 TM |
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 | ||
6dc9d57a | 101 | struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp) |
b4454fe1 TM |
102 | { |
103 | struct nfs4_state_owner *sp; | |
9f958ab8 | 104 | struct rb_node *pos; |
b4454fe1 TM |
105 | struct rpc_cred *cred = NULL; |
106 | ||
9f958ab8 TM |
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); | |
b4454fe1 TM |
109 | if (list_empty(&sp->so_states)) |
110 | continue; | |
111 | cred = get_rpccred(sp->so_cred); | |
112 | break; | |
113 | } | |
114 | return cred; | |
115 | } | |
116 | ||
b4b82607 AA |
117 | #if defined(CONFIG_NFS_V4_1) |
118 | ||
4d643d1d AA |
119 | int nfs41_init_clientid(struct nfs_client *clp, struct rpc_cred *cred) |
120 | { | |
121 | int status; | |
122 | ||
123 | status = nfs4_proc_exchange_id(clp, cred); | |
124 | if (status == 0) | |
125 | /* create session schedules state renewal upon success */ | |
f26468fb | 126 | status = nfs4_proc_create_session(clp); |
4d643d1d AA |
127 | if (status == 0) |
128 | nfs_mark_client_ready(clp, NFS_CS_READY); | |
129 | return status; | |
130 | } | |
131 | ||
b4b82607 AA |
132 | struct rpc_cred *nfs4_get_exchange_id_cred(struct nfs_client *clp) |
133 | { | |
134 | struct rpc_cred *cred; | |
135 | ||
136 | spin_lock(&clp->cl_lock); | |
137 | cred = nfs4_get_machine_cred_locked(clp); | |
138 | spin_unlock(&clp->cl_lock); | |
139 | return cred; | |
140 | } | |
141 | ||
142 | #endif /* CONFIG_NFS_V4_1 */ | |
143 | ||
a7b72103 | 144 | struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp) |
286d7d6a TM |
145 | { |
146 | struct nfs4_state_owner *sp; | |
9f958ab8 | 147 | struct rb_node *pos; |
a2b2bb88 | 148 | struct rpc_cred *cred; |
286d7d6a | 149 | |
6dc9d57a TM |
150 | spin_lock(&clp->cl_lock); |
151 | cred = nfs4_get_machine_cred_locked(clp); | |
a2b2bb88 TM |
152 | if (cred != NULL) |
153 | goto out; | |
9f958ab8 TM |
154 | pos = rb_first(&clp->cl_state_owners); |
155 | if (pos != NULL) { | |
156 | sp = rb_entry(pos, struct nfs4_state_owner, so_client_node); | |
a2b2bb88 | 157 | cred = get_rpccred(sp->so_cred); |
286d7d6a | 158 | } |
a2b2bb88 | 159 | out: |
6dc9d57a | 160 | spin_unlock(&clp->cl_lock); |
a2b2bb88 | 161 | return cred; |
286d7d6a TM |
162 | } |
163 | ||
9f958ab8 TM |
164 | static void nfs_alloc_unique_id(struct rb_root *root, struct nfs_unique_id *new, |
165 | __u64 minval, int maxbits) | |
166 | { | |
167 | struct rb_node **p, *parent; | |
168 | struct nfs_unique_id *pos; | |
169 | __u64 mask = ~0ULL; | |
170 | ||
171 | if (maxbits < 64) | |
172 | mask = (1ULL << maxbits) - 1ULL; | |
173 | ||
174 | /* Ensure distribution is more or less flat */ | |
175 | get_random_bytes(&new->id, sizeof(new->id)); | |
176 | new->id &= mask; | |
177 | if (new->id < minval) | |
178 | new->id += minval; | |
179 | retry: | |
180 | p = &root->rb_node; | |
181 | parent = NULL; | |
182 | ||
183 | while (*p != NULL) { | |
184 | parent = *p; | |
185 | pos = rb_entry(parent, struct nfs_unique_id, rb_node); | |
186 | ||
187 | if (new->id < pos->id) | |
188 | p = &(*p)->rb_left; | |
189 | else if (new->id > pos->id) | |
190 | p = &(*p)->rb_right; | |
191 | else | |
192 | goto id_exists; | |
193 | } | |
194 | rb_link_node(&new->rb_node, parent, p); | |
195 | rb_insert_color(&new->rb_node, root); | |
196 | return; | |
197 | id_exists: | |
198 | for (;;) { | |
199 | new->id++; | |
200 | if (new->id < minval || (new->id & mask) != new->id) { | |
201 | new->id = minval; | |
202 | break; | |
203 | } | |
204 | parent = rb_next(parent); | |
205 | if (parent == NULL) | |
206 | break; | |
207 | pos = rb_entry(parent, struct nfs_unique_id, rb_node); | |
208 | if (new->id < pos->id) | |
209 | break; | |
210 | } | |
211 | goto retry; | |
212 | } | |
213 | ||
214 | static void nfs_free_unique_id(struct rb_root *root, struct nfs_unique_id *id) | |
215 | { | |
216 | rb_erase(&id->rb_node, root); | |
217 | } | |
218 | ||
1da177e4 | 219 | static struct nfs4_state_owner * |
6f2e64d3 | 220 | nfs4_find_state_owner(struct nfs_server *server, struct rpc_cred *cred) |
1da177e4 | 221 | { |
6f2e64d3 | 222 | struct nfs_client *clp = server->nfs_client; |
9f958ab8 TM |
223 | struct rb_node **p = &clp->cl_state_owners.rb_node, |
224 | *parent = NULL; | |
1da177e4 LT |
225 | struct nfs4_state_owner *sp, *res = NULL; |
226 | ||
9f958ab8 TM |
227 | while (*p != NULL) { |
228 | parent = *p; | |
229 | sp = rb_entry(parent, struct nfs4_state_owner, so_client_node); | |
230 | ||
6f2e64d3 TM |
231 | if (server < sp->so_server) { |
232 | p = &parent->rb_left; | |
233 | continue; | |
234 | } | |
235 | if (server > sp->so_server) { | |
236 | p = &parent->rb_right; | |
237 | continue; | |
238 | } | |
9f958ab8 TM |
239 | if (cred < sp->so_cred) |
240 | p = &parent->rb_left; | |
241 | else if (cred > sp->so_cred) | |
242 | p = &parent->rb_right; | |
243 | else { | |
244 | atomic_inc(&sp->so_count); | |
245 | res = sp; | |
246 | break; | |
247 | } | |
1da177e4 LT |
248 | } |
249 | return res; | |
250 | } | |
251 | ||
9f958ab8 TM |
252 | static struct nfs4_state_owner * |
253 | nfs4_insert_state_owner(struct nfs_client *clp, struct nfs4_state_owner *new) | |
254 | { | |
255 | struct rb_node **p = &clp->cl_state_owners.rb_node, | |
256 | *parent = NULL; | |
257 | struct nfs4_state_owner *sp; | |
258 | ||
259 | while (*p != NULL) { | |
260 | parent = *p; | |
261 | sp = rb_entry(parent, struct nfs4_state_owner, so_client_node); | |
262 | ||
6f2e64d3 TM |
263 | if (new->so_server < sp->so_server) { |
264 | p = &parent->rb_left; | |
265 | continue; | |
266 | } | |
267 | if (new->so_server > sp->so_server) { | |
268 | p = &parent->rb_right; | |
269 | continue; | |
270 | } | |
9f958ab8 TM |
271 | if (new->so_cred < sp->so_cred) |
272 | p = &parent->rb_left; | |
273 | else if (new->so_cred > sp->so_cred) | |
274 | p = &parent->rb_right; | |
275 | else { | |
276 | atomic_inc(&sp->so_count); | |
277 | return sp; | |
278 | } | |
279 | } | |
280 | nfs_alloc_unique_id(&clp->cl_openowner_id, &new->so_owner_id, 1, 64); | |
281 | rb_link_node(&new->so_client_node, parent, p); | |
282 | rb_insert_color(&new->so_client_node, &clp->cl_state_owners); | |
283 | return new; | |
284 | } | |
285 | ||
286 | static void | |
287 | nfs4_remove_state_owner(struct nfs_client *clp, struct nfs4_state_owner *sp) | |
288 | { | |
289 | if (!RB_EMPTY_NODE(&sp->so_client_node)) | |
290 | rb_erase(&sp->so_client_node, &clp->cl_state_owners); | |
291 | nfs_free_unique_id(&clp->cl_openowner_id, &sp->so_owner_id); | |
292 | } | |
293 | ||
1da177e4 LT |
294 | /* |
295 | * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to | |
296 | * create a new state_owner. | |
297 | * | |
298 | */ | |
299 | static struct nfs4_state_owner * | |
300 | nfs4_alloc_state_owner(void) | |
301 | { | |
302 | struct nfs4_state_owner *sp; | |
303 | ||
cee54fc9 | 304 | sp = kzalloc(sizeof(*sp),GFP_KERNEL); |
1da177e4 LT |
305 | if (!sp) |
306 | return NULL; | |
ec073428 | 307 | spin_lock_init(&sp->so_lock); |
1da177e4 LT |
308 | INIT_LIST_HEAD(&sp->so_states); |
309 | INIT_LIST_HEAD(&sp->so_delegations); | |
cee54fc9 TM |
310 | rpc_init_wait_queue(&sp->so_sequence.wait, "Seqid_waitqueue"); |
311 | sp->so_seqid.sequence = &sp->so_sequence; | |
312 | spin_lock_init(&sp->so_sequence.lock); | |
313 | INIT_LIST_HEAD(&sp->so_sequence.list); | |
1da177e4 LT |
314 | atomic_set(&sp->so_count, 1); |
315 | return sp; | |
316 | } | |
317 | ||
1d2e88e7 | 318 | static void |
1da177e4 LT |
319 | nfs4_drop_state_owner(struct nfs4_state_owner *sp) |
320 | { | |
9f958ab8 TM |
321 | if (!RB_EMPTY_NODE(&sp->so_client_node)) { |
322 | struct nfs_client *clp = sp->so_client; | |
323 | ||
324 | spin_lock(&clp->cl_lock); | |
325 | rb_erase(&sp->so_client_node, &clp->cl_state_owners); | |
326 | RB_CLEAR_NODE(&sp->so_client_node); | |
327 | spin_unlock(&clp->cl_lock); | |
328 | } | |
1da177e4 LT |
329 | } |
330 | ||
1da177e4 LT |
331 | struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server, struct rpc_cred *cred) |
332 | { | |
7539bbab | 333 | struct nfs_client *clp = server->nfs_client; |
1da177e4 LT |
334 | struct nfs4_state_owner *sp, *new; |
335 | ||
1da177e4 | 336 | spin_lock(&clp->cl_lock); |
6f2e64d3 | 337 | sp = nfs4_find_state_owner(server, cred); |
1da177e4 | 338 | spin_unlock(&clp->cl_lock); |
1da177e4 LT |
339 | if (sp != NULL) |
340 | return sp; | |
9f958ab8 TM |
341 | new = nfs4_alloc_state_owner(); |
342 | if (new == NULL) | |
343 | return NULL; | |
344 | new->so_client = clp; | |
6f2e64d3 | 345 | new->so_server = server; |
9f958ab8 TM |
346 | new->so_cred = cred; |
347 | spin_lock(&clp->cl_lock); | |
348 | sp = nfs4_insert_state_owner(clp, new); | |
349 | spin_unlock(&clp->cl_lock); | |
350 | if (sp == new) | |
351 | get_rpccred(cred); | |
f6a1cc89 TM |
352 | else { |
353 | rpc_destroy_wait_queue(&new->so_sequence.wait); | |
9f958ab8 | 354 | kfree(new); |
f6a1cc89 | 355 | } |
9f958ab8 | 356 | return sp; |
1da177e4 LT |
357 | } |
358 | ||
1da177e4 LT |
359 | void nfs4_put_state_owner(struct nfs4_state_owner *sp) |
360 | { | |
adfa6f98 | 361 | struct nfs_client *clp = sp->so_client; |
1da177e4 LT |
362 | struct rpc_cred *cred = sp->so_cred; |
363 | ||
364 | if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock)) | |
365 | return; | |
9f958ab8 | 366 | nfs4_remove_state_owner(clp, sp); |
1da177e4 | 367 | spin_unlock(&clp->cl_lock); |
f6a1cc89 | 368 | rpc_destroy_wait_queue(&sp->so_sequence.wait); |
1da177e4 LT |
369 | put_rpccred(cred); |
370 | kfree(sp); | |
371 | } | |
372 | ||
373 | static struct nfs4_state * | |
374 | nfs4_alloc_open_state(void) | |
375 | { | |
376 | struct nfs4_state *state; | |
377 | ||
e7616923 | 378 | state = kzalloc(sizeof(*state), GFP_KERNEL); |
1da177e4 LT |
379 | if (!state) |
380 | return NULL; | |
1da177e4 LT |
381 | atomic_set(&state->count, 1); |
382 | INIT_LIST_HEAD(&state->lock_states); | |
8d0a8a9d | 383 | spin_lock_init(&state->state_lock); |
8bda4e4c | 384 | seqlock_init(&state->seqlock); |
1da177e4 LT |
385 | return state; |
386 | } | |
387 | ||
4cecb76f | 388 | void |
dc0b027d | 389 | nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode) |
4cecb76f | 390 | { |
dc0b027d | 391 | if (state->state == fmode) |
4cecb76f TM |
392 | return; |
393 | /* NB! List reordering - see the reclaim code for why. */ | |
dc0b027d TM |
394 | if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) { |
395 | if (fmode & FMODE_WRITE) | |
4cecb76f TM |
396 | list_move(&state->open_states, &state->owner->so_states); |
397 | else | |
398 | list_move_tail(&state->open_states, &state->owner->so_states); | |
399 | } | |
dc0b027d | 400 | state->state = fmode; |
4cecb76f TM |
401 | } |
402 | ||
1da177e4 LT |
403 | static struct nfs4_state * |
404 | __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner) | |
405 | { | |
406 | struct nfs_inode *nfsi = NFS_I(inode); | |
407 | struct nfs4_state *state; | |
408 | ||
409 | list_for_each_entry(state, &nfsi->open_states, inode_states) { | |
1c816efa | 410 | if (state->owner != owner) |
1da177e4 | 411 | continue; |
1c816efa | 412 | if (atomic_inc_not_zero(&state->count)) |
1da177e4 | 413 | return state; |
1da177e4 LT |
414 | } |
415 | return NULL; | |
416 | } | |
417 | ||
1da177e4 LT |
418 | static void |
419 | nfs4_free_open_state(struct nfs4_state *state) | |
420 | { | |
421 | kfree(state); | |
422 | } | |
423 | ||
424 | struct nfs4_state * | |
425 | nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner) | |
426 | { | |
427 | struct nfs4_state *state, *new; | |
428 | struct nfs_inode *nfsi = NFS_I(inode); | |
429 | ||
430 | spin_lock(&inode->i_lock); | |
431 | state = __nfs4_find_state_byowner(inode, owner); | |
432 | spin_unlock(&inode->i_lock); | |
433 | if (state) | |
434 | goto out; | |
435 | new = nfs4_alloc_open_state(); | |
ec073428 | 436 | spin_lock(&owner->so_lock); |
1da177e4 LT |
437 | spin_lock(&inode->i_lock); |
438 | state = __nfs4_find_state_byowner(inode, owner); | |
439 | if (state == NULL && new != NULL) { | |
440 | state = new; | |
1da177e4 LT |
441 | state->owner = owner; |
442 | atomic_inc(&owner->so_count); | |
443 | list_add(&state->inode_states, &nfsi->open_states); | |
444 | state->inode = igrab(inode); | |
445 | spin_unlock(&inode->i_lock); | |
ec073428 TM |
446 | /* Note: The reclaim code dictates that we add stateless |
447 | * and read-only stateids to the end of the list */ | |
448 | list_add_tail(&state->open_states, &owner->so_states); | |
449 | spin_unlock(&owner->so_lock); | |
1da177e4 LT |
450 | } else { |
451 | spin_unlock(&inode->i_lock); | |
ec073428 | 452 | spin_unlock(&owner->so_lock); |
1da177e4 LT |
453 | if (new) |
454 | nfs4_free_open_state(new); | |
455 | } | |
456 | out: | |
457 | return state; | |
458 | } | |
459 | ||
1da177e4 LT |
460 | void nfs4_put_open_state(struct nfs4_state *state) |
461 | { | |
462 | struct inode *inode = state->inode; | |
463 | struct nfs4_state_owner *owner = state->owner; | |
464 | ||
ec073428 | 465 | if (!atomic_dec_and_lock(&state->count, &owner->so_lock)) |
1da177e4 | 466 | return; |
ec073428 | 467 | spin_lock(&inode->i_lock); |
ba683031 | 468 | list_del(&state->inode_states); |
1da177e4 | 469 | list_del(&state->open_states); |
ec073428 TM |
470 | spin_unlock(&inode->i_lock); |
471 | spin_unlock(&owner->so_lock); | |
1da177e4 | 472 | iput(inode); |
1da177e4 LT |
473 | nfs4_free_open_state(state); |
474 | nfs4_put_state_owner(owner); | |
475 | } | |
476 | ||
477 | /* | |
83c9d41e | 478 | * Close the current file. |
1da177e4 | 479 | */ |
dc0b027d | 480 | static void __nfs4_close(struct path *path, struct nfs4_state *state, fmode_t fmode, int wait) |
1da177e4 | 481 | { |
1da177e4 | 482 | struct nfs4_state_owner *owner = state->owner; |
003707c7 | 483 | int call_close = 0; |
dc0b027d | 484 | fmode_t newstate; |
1da177e4 LT |
485 | |
486 | atomic_inc(&owner->so_count); | |
1da177e4 | 487 | /* Protect against nfs4_find_state() */ |
ec073428 | 488 | spin_lock(&owner->so_lock); |
dc0b027d | 489 | switch (fmode & (FMODE_READ | FMODE_WRITE)) { |
e7616923 TM |
490 | case FMODE_READ: |
491 | state->n_rdonly--; | |
492 | break; | |
493 | case FMODE_WRITE: | |
494 | state->n_wronly--; | |
495 | break; | |
496 | case FMODE_READ|FMODE_WRITE: | |
497 | state->n_rdwr--; | |
498 | } | |
003707c7 | 499 | newstate = FMODE_READ|FMODE_WRITE; |
e7616923 | 500 | if (state->n_rdwr == 0) { |
003707c7 | 501 | if (state->n_rdonly == 0) { |
e7616923 | 502 | newstate &= ~FMODE_READ; |
003707c7 TM |
503 | call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags); |
504 | call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); | |
505 | } | |
506 | if (state->n_wronly == 0) { | |
e7616923 | 507 | newstate &= ~FMODE_WRITE; |
003707c7 TM |
508 | call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags); |
509 | call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); | |
510 | } | |
511 | if (newstate == 0) | |
512 | clear_bit(NFS_DELEGATED_STATE, &state->flags); | |
e7616923 | 513 | } |
003707c7 | 514 | nfs4_state_set_mode_locked(state, newstate); |
ec073428 | 515 | spin_unlock(&owner->so_lock); |
4cecb76f | 516 | |
003707c7 | 517 | if (!call_close) { |
b39e625b TM |
518 | nfs4_put_open_state(state); |
519 | nfs4_put_state_owner(owner); | |
520 | } else | |
a49c3c77 TM |
521 | nfs4_do_close(path, state, wait); |
522 | } | |
523 | ||
dc0b027d | 524 | void nfs4_close_state(struct path *path, struct nfs4_state *state, fmode_t fmode) |
a49c3c77 | 525 | { |
dc0b027d | 526 | __nfs4_close(path, state, fmode, 0); |
a49c3c77 TM |
527 | } |
528 | ||
dc0b027d | 529 | void nfs4_close_sync(struct path *path, struct nfs4_state *state, fmode_t fmode) |
a49c3c77 | 530 | { |
dc0b027d | 531 | __nfs4_close(path, state, fmode, 1); |
1da177e4 LT |
532 | } |
533 | ||
534 | /* | |
535 | * Search the state->lock_states for an existing lock_owner | |
536 | * that is compatible with current->files | |
537 | */ | |
538 | static struct nfs4_lock_state * | |
539 | __nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner) | |
540 | { | |
541 | struct nfs4_lock_state *pos; | |
542 | list_for_each_entry(pos, &state->lock_states, ls_locks) { | |
543 | if (pos->ls_owner != fl_owner) | |
544 | continue; | |
545 | atomic_inc(&pos->ls_count); | |
546 | return pos; | |
547 | } | |
548 | return NULL; | |
549 | } | |
550 | ||
1da177e4 LT |
551 | /* |
552 | * Return a compatible lock_state. If no initialized lock_state structure | |
553 | * exists, return an uninitialized one. | |
554 | * | |
1da177e4 LT |
555 | */ |
556 | static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner) | |
557 | { | |
558 | struct nfs4_lock_state *lsp; | |
adfa6f98 | 559 | struct nfs_client *clp = state->owner->so_client; |
1da177e4 | 560 | |
cee54fc9 | 561 | lsp = kzalloc(sizeof(*lsp), GFP_KERNEL); |
1da177e4 LT |
562 | if (lsp == NULL) |
563 | return NULL; | |
d0dc3701 TM |
564 | rpc_init_wait_queue(&lsp->ls_sequence.wait, "lock_seqid_waitqueue"); |
565 | spin_lock_init(&lsp->ls_sequence.lock); | |
566 | INIT_LIST_HEAD(&lsp->ls_sequence.list); | |
567 | lsp->ls_seqid.sequence = &lsp->ls_sequence; | |
1da177e4 | 568 | atomic_set(&lsp->ls_count, 1); |
b64aec8d | 569 | lsp->ls_state = state; |
1da177e4 | 570 | lsp->ls_owner = fl_owner; |
1da177e4 | 571 | spin_lock(&clp->cl_lock); |
9f958ab8 | 572 | nfs_alloc_unique_id(&clp->cl_lockowner_id, &lsp->ls_id, 1, 64); |
1da177e4 | 573 | spin_unlock(&clp->cl_lock); |
8d0a8a9d | 574 | INIT_LIST_HEAD(&lsp->ls_locks); |
1da177e4 LT |
575 | return lsp; |
576 | } | |
577 | ||
9f958ab8 TM |
578 | static void nfs4_free_lock_state(struct nfs4_lock_state *lsp) |
579 | { | |
580 | struct nfs_client *clp = lsp->ls_state->owner->so_client; | |
581 | ||
582 | spin_lock(&clp->cl_lock); | |
583 | nfs_free_unique_id(&clp->cl_lockowner_id, &lsp->ls_id); | |
584 | spin_unlock(&clp->cl_lock); | |
f6a1cc89 | 585 | rpc_destroy_wait_queue(&lsp->ls_sequence.wait); |
9f958ab8 TM |
586 | kfree(lsp); |
587 | } | |
588 | ||
1da177e4 LT |
589 | /* |
590 | * Return a compatible lock_state. If no initialized lock_state structure | |
591 | * exists, return an uninitialized one. | |
592 | * | |
1da177e4 | 593 | */ |
8d0a8a9d | 594 | static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner) |
1da177e4 | 595 | { |
8d0a8a9d | 596 | struct nfs4_lock_state *lsp, *new = NULL; |
1da177e4 | 597 | |
8d0a8a9d TM |
598 | for(;;) { |
599 | spin_lock(&state->state_lock); | |
600 | lsp = __nfs4_find_lock_state(state, owner); | |
601 | if (lsp != NULL) | |
602 | break; | |
603 | if (new != NULL) { | |
8d0a8a9d TM |
604 | list_add(&new->ls_locks, &state->lock_states); |
605 | set_bit(LK_STATE_IN_USE, &state->flags); | |
606 | lsp = new; | |
607 | new = NULL; | |
608 | break; | |
609 | } | |
610 | spin_unlock(&state->state_lock); | |
611 | new = nfs4_alloc_lock_state(state, owner); | |
612 | if (new == NULL) | |
613 | return NULL; | |
614 | } | |
615 | spin_unlock(&state->state_lock); | |
9f958ab8 TM |
616 | if (new != NULL) |
617 | nfs4_free_lock_state(new); | |
1da177e4 LT |
618 | return lsp; |
619 | } | |
620 | ||
621 | /* | |
8d0a8a9d TM |
622 | * Release reference to lock_state, and free it if we see that |
623 | * it is no longer in use | |
1da177e4 | 624 | */ |
faf5f49c | 625 | void nfs4_put_lock_state(struct nfs4_lock_state *lsp) |
1da177e4 | 626 | { |
8d0a8a9d | 627 | struct nfs4_state *state; |
1da177e4 | 628 | |
8d0a8a9d TM |
629 | if (lsp == NULL) |
630 | return; | |
631 | state = lsp->ls_state; | |
632 | if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock)) | |
633 | return; | |
634 | list_del(&lsp->ls_locks); | |
635 | if (list_empty(&state->lock_states)) | |
636 | clear_bit(LK_STATE_IN_USE, &state->flags); | |
637 | spin_unlock(&state->state_lock); | |
9f958ab8 | 638 | nfs4_free_lock_state(lsp); |
1da177e4 LT |
639 | } |
640 | ||
8d0a8a9d | 641 | static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src) |
1da177e4 | 642 | { |
8d0a8a9d | 643 | struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner; |
1da177e4 | 644 | |
8d0a8a9d TM |
645 | dst->fl_u.nfs4_fl.owner = lsp; |
646 | atomic_inc(&lsp->ls_count); | |
647 | } | |
1da177e4 | 648 | |
8d0a8a9d | 649 | static void nfs4_fl_release_lock(struct file_lock *fl) |
1da177e4 | 650 | { |
8d0a8a9d | 651 | nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner); |
1da177e4 LT |
652 | } |
653 | ||
6aed6285 | 654 | static const struct file_lock_operations nfs4_fl_lock_ops = { |
8d0a8a9d TM |
655 | .fl_copy_lock = nfs4_fl_copy_lock, |
656 | .fl_release_private = nfs4_fl_release_lock, | |
657 | }; | |
658 | ||
659 | int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl) | |
1da177e4 | 660 | { |
8d0a8a9d TM |
661 | struct nfs4_lock_state *lsp; |
662 | ||
663 | if (fl->fl_ops != NULL) | |
664 | return 0; | |
665 | lsp = nfs4_get_lock_state(state, fl->fl_owner); | |
666 | if (lsp == NULL) | |
667 | return -ENOMEM; | |
668 | fl->fl_u.nfs4_fl.owner = lsp; | |
669 | fl->fl_ops = &nfs4_fl_lock_ops; | |
670 | return 0; | |
1da177e4 LT |
671 | } |
672 | ||
8d0a8a9d TM |
673 | /* |
674 | * Byte-range lock aware utility to initialize the stateid of read/write | |
675 | * requests. | |
1da177e4 | 676 | */ |
8d0a8a9d | 677 | void nfs4_copy_stateid(nfs4_stateid *dst, struct nfs4_state *state, fl_owner_t fl_owner) |
1da177e4 | 678 | { |
8d0a8a9d | 679 | struct nfs4_lock_state *lsp; |
8bda4e4c | 680 | int seq; |
1da177e4 | 681 | |
8bda4e4c TM |
682 | do { |
683 | seq = read_seqbegin(&state->seqlock); | |
684 | memcpy(dst, &state->stateid, sizeof(*dst)); | |
685 | } while (read_seqretry(&state->seqlock, seq)); | |
8d0a8a9d TM |
686 | if (test_bit(LK_STATE_IN_USE, &state->flags) == 0) |
687 | return; | |
1da177e4 | 688 | |
8d0a8a9d TM |
689 | spin_lock(&state->state_lock); |
690 | lsp = __nfs4_find_lock_state(state, fl_owner); | |
691 | if (lsp != NULL && (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0) | |
692 | memcpy(dst, &lsp->ls_stateid, sizeof(*dst)); | |
693 | spin_unlock(&state->state_lock); | |
1da177e4 LT |
694 | nfs4_put_lock_state(lsp); |
695 | } | |
696 | ||
cee54fc9 TM |
697 | struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter) |
698 | { | |
cee54fc9 TM |
699 | struct nfs_seqid *new; |
700 | ||
701 | new = kmalloc(sizeof(*new), GFP_KERNEL); | |
702 | if (new != NULL) { | |
703 | new->sequence = counter; | |
2f74c0a0 | 704 | INIT_LIST_HEAD(&new->list); |
cee54fc9 TM |
705 | } |
706 | return new; | |
707 | } | |
708 | ||
709 | void nfs_free_seqid(struct nfs_seqid *seqid) | |
1da177e4 | 710 | { |
2f74c0a0 TM |
711 | if (!list_empty(&seqid->list)) { |
712 | struct rpc_sequence *sequence = seqid->sequence->sequence; | |
cee54fc9 | 713 | |
2f74c0a0 TM |
714 | spin_lock(&sequence->lock); |
715 | list_del(&seqid->list); | |
716 | spin_unlock(&sequence->lock); | |
717 | rpc_wake_up(&sequence->wait); | |
718 | } | |
cee54fc9 | 719 | kfree(seqid); |
1da177e4 LT |
720 | } |
721 | ||
722 | /* | |
cee54fc9 TM |
723 | * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or |
724 | * failed with a seqid incrementing error - | |
725 | * see comments nfs_fs.h:seqid_mutating_error() | |
726 | */ | |
88d90939 | 727 | static void nfs_increment_seqid(int status, struct nfs_seqid *seqid) |
cee54fc9 | 728 | { |
2f74c0a0 | 729 | BUG_ON(list_first_entry(&seqid->sequence->sequence->list, struct nfs_seqid, list) != seqid); |
cee54fc9 TM |
730 | switch (status) { |
731 | case 0: | |
732 | break; | |
733 | case -NFS4ERR_BAD_SEQID: | |
6f43ddcc TM |
734 | if (seqid->sequence->flags & NFS_SEQID_CONFIRMED) |
735 | return; | |
736 | printk(KERN_WARNING "NFS: v4 server returned a bad" | |
497799e7 DM |
737 | " sequence-id error on an" |
738 | " unconfirmed sequence %p!\n", | |
6f43ddcc | 739 | seqid->sequence); |
cee54fc9 TM |
740 | case -NFS4ERR_STALE_CLIENTID: |
741 | case -NFS4ERR_STALE_STATEID: | |
742 | case -NFS4ERR_BAD_STATEID: | |
743 | case -NFS4ERR_BADXDR: | |
744 | case -NFS4ERR_RESOURCE: | |
745 | case -NFS4ERR_NOFILEHANDLE: | |
746 | /* Non-seqid mutating errors */ | |
747 | return; | |
748 | }; | |
749 | /* | |
750 | * Note: no locking needed as we are guaranteed to be first | |
751 | * on the sequence list | |
752 | */ | |
753 | seqid->sequence->counter++; | |
754 | } | |
755 | ||
756 | void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid) | |
757 | { | |
34dc1ad7 BH |
758 | struct nfs4_state_owner *sp = container_of(seqid->sequence, |
759 | struct nfs4_state_owner, so_seqid); | |
760 | struct nfs_server *server = sp->so_server; | |
761 | ||
762 | if (status == -NFS4ERR_BAD_SEQID) | |
1da177e4 | 763 | nfs4_drop_state_owner(sp); |
34dc1ad7 BH |
764 | if (!nfs4_has_session(server->nfs_client)) |
765 | nfs_increment_seqid(status, seqid); | |
cee54fc9 TM |
766 | } |
767 | ||
768 | /* | |
cee54fc9 TM |
769 | * Increment the seqid if the LOCK/LOCKU succeeded, or |
770 | * failed with a seqid incrementing error - | |
771 | * see comments nfs_fs.h:seqid_mutating_error() | |
772 | */ | |
773 | void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid) | |
774 | { | |
88d90939 | 775 | nfs_increment_seqid(status, seqid); |
cee54fc9 TM |
776 | } |
777 | ||
778 | int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task) | |
779 | { | |
780 | struct rpc_sequence *sequence = seqid->sequence->sequence; | |
781 | int status = 0; | |
782 | ||
783 | spin_lock(&sequence->lock); | |
2f74c0a0 TM |
784 | if (list_empty(&seqid->list)) |
785 | list_add_tail(&seqid->list, &sequence->list); | |
786 | if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid) | |
787 | goto unlock; | |
5d00837b | 788 | rpc_sleep_on(&sequence->wait, task, NULL); |
2f74c0a0 TM |
789 | status = -EAGAIN; |
790 | unlock: | |
cee54fc9 TM |
791 | spin_unlock(&sequence->lock); |
792 | return status; | |
1da177e4 LT |
793 | } |
794 | ||
e005e804 | 795 | static int nfs4_run_state_manager(void *); |
1da177e4 | 796 | |
e005e804 | 797 | static void nfs4_clear_state_manager_bit(struct nfs_client *clp) |
433fbe4c TM |
798 | { |
799 | smp_mb__before_clear_bit(); | |
e005e804 | 800 | clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state); |
433fbe4c | 801 | smp_mb__after_clear_bit(); |
e005e804 | 802 | wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING); |
433fbe4c TM |
803 | rpc_wake_up(&clp->cl_rpcwaitq); |
804 | } | |
805 | ||
1da177e4 | 806 | /* |
e005e804 | 807 | * Schedule the nfs_client asynchronous state management routine |
1da177e4 | 808 | */ |
b0d3ded1 | 809 | void nfs4_schedule_state_manager(struct nfs_client *clp) |
1da177e4 | 810 | { |
5043e900 | 811 | struct task_struct *task; |
1da177e4 | 812 | |
e005e804 TM |
813 | if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0) |
814 | return; | |
5043e900 TM |
815 | __module_get(THIS_MODULE); |
816 | atomic_inc(&clp->cl_count); | |
e005e804 | 817 | task = kthread_run(nfs4_run_state_manager, clp, "%s-manager", |
5d8515ca CL |
818 | rpc_peeraddr2str(clp->cl_rpcclient, |
819 | RPC_DISPLAY_ADDR)); | |
5043e900 TM |
820 | if (!IS_ERR(task)) |
821 | return; | |
e005e804 | 822 | nfs4_clear_state_manager_bit(clp); |
24c8dbbb | 823 | nfs_put_client(clp); |
5043e900 | 824 | module_put(THIS_MODULE); |
1da177e4 LT |
825 | } |
826 | ||
827 | /* | |
828 | * Schedule a state recovery attempt | |
829 | */ | |
adfa6f98 | 830 | void nfs4_schedule_state_recovery(struct nfs_client *clp) |
1da177e4 LT |
831 | { |
832 | if (!clp) | |
833 | return; | |
e598d843 TM |
834 | if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) |
835 | set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); | |
e005e804 | 836 | nfs4_schedule_state_manager(clp); |
1da177e4 LT |
837 | } |
838 | ||
b79a4a1b TM |
839 | static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state) |
840 | { | |
841 | ||
842 | set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); | |
843 | /* Don't recover state that expired before the reboot */ | |
844 | if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) { | |
845 | clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); | |
846 | return 0; | |
847 | } | |
7eff03ae | 848 | set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags); |
b79a4a1b TM |
849 | set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state); |
850 | return 1; | |
851 | } | |
852 | ||
9e33bed5 | 853 | int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state) |
b79a4a1b TM |
854 | { |
855 | set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags); | |
856 | clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); | |
7eff03ae | 857 | set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags); |
b79a4a1b TM |
858 | set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state); |
859 | return 1; | |
860 | } | |
861 | ||
02860014 | 862 | static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops) |
1da177e4 LT |
863 | { |
864 | struct inode *inode = state->inode; | |
19e03c57 | 865 | struct nfs_inode *nfsi = NFS_I(inode); |
1da177e4 LT |
866 | struct file_lock *fl; |
867 | int status = 0; | |
868 | ||
3f09df70 TM |
869 | if (inode->i_flock == NULL) |
870 | return 0; | |
871 | ||
872 | /* Guard against delegation returns and new lock/unlock calls */ | |
19e03c57 | 873 | down_write(&nfsi->rwsem); |
3f09df70 TM |
874 | /* Protect inode->i_flock using the BKL */ |
875 | lock_kernel(); | |
90dc7d27 | 876 | for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) { |
43b2a33a | 877 | if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK))) |
1da177e4 | 878 | continue; |
cd3758e3 | 879 | if (nfs_file_open_context(fl->fl_file)->state != state) |
1da177e4 | 880 | continue; |
3f09df70 | 881 | unlock_kernel(); |
1da177e4 | 882 | status = ops->recover_lock(state, fl); |
1da177e4 | 883 | switch (status) { |
965b5d67 TM |
884 | case 0: |
885 | break; | |
886 | case -ESTALE: | |
887 | case -NFS4ERR_ADMIN_REVOKED: | |
888 | case -NFS4ERR_STALE_STATEID: | |
889 | case -NFS4ERR_BAD_STATEID: | |
890 | case -NFS4ERR_EXPIRED: | |
891 | case -NFS4ERR_NO_GRACE: | |
892 | case -NFS4ERR_STALE_CLIENTID: | |
9c4c761a TM |
893 | case -NFS4ERR_BADSESSION: |
894 | case -NFS4ERR_BADSLOT: | |
895 | case -NFS4ERR_BAD_HIGH_SLOT: | |
896 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: | |
965b5d67 | 897 | goto out; |
1da177e4 LT |
898 | default: |
899 | printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n", | |
3110ff80 | 900 | __func__, status); |
965b5d67 TM |
901 | case -ENOMEM: |
902 | case -NFS4ERR_DENIED: | |
1da177e4 LT |
903 | case -NFS4ERR_RECLAIM_BAD: |
904 | case -NFS4ERR_RECLAIM_CONFLICT: | |
43b2a33a | 905 | /* kill_proc(fl->fl_pid, SIGLOST, 1); */ |
965b5d67 | 906 | status = 0; |
1da177e4 | 907 | } |
3f09df70 | 908 | lock_kernel(); |
1da177e4 | 909 | } |
3f09df70 | 910 | unlock_kernel(); |
965b5d67 | 911 | out: |
19e03c57 | 912 | up_write(&nfsi->rwsem); |
1da177e4 LT |
913 | return status; |
914 | } | |
915 | ||
02860014 | 916 | static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops) |
1da177e4 LT |
917 | { |
918 | struct nfs4_state *state; | |
919 | struct nfs4_lock_state *lock; | |
920 | int status = 0; | |
921 | ||
922 | /* Note: we rely on the sp->so_states list being ordered | |
923 | * so that we always reclaim open(O_RDWR) and/or open(O_WRITE) | |
924 | * states first. | |
925 | * This is needed to ensure that the server won't give us any | |
926 | * read delegations that we have to return if, say, we are | |
927 | * recovering after a network partition or a reboot from a | |
928 | * server that doesn't support a grace period. | |
929 | */ | |
fe1d8195 TM |
930 | restart: |
931 | spin_lock(&sp->so_lock); | |
1da177e4 | 932 | list_for_each_entry(state, &sp->so_states, open_states) { |
b79a4a1b TM |
933 | if (!test_and_clear_bit(ops->state_flag_bit, &state->flags)) |
934 | continue; | |
1da177e4 LT |
935 | if (state->state == 0) |
936 | continue; | |
fe1d8195 TM |
937 | atomic_inc(&state->count); |
938 | spin_unlock(&sp->so_lock); | |
1da177e4 | 939 | status = ops->recover_open(sp, state); |
1da177e4 | 940 | if (status >= 0) { |
02860014 TM |
941 | status = nfs4_reclaim_locks(state, ops); |
942 | if (status >= 0) { | |
943 | list_for_each_entry(lock, &state->lock_states, ls_locks) { | |
944 | if (!(lock->ls_flags & NFS_LOCK_INITIALIZED)) | |
945 | printk("%s: Lock reclaim failed!\n", | |
3110ff80 | 946 | __func__); |
02860014 | 947 | } |
fe1d8195 TM |
948 | nfs4_put_open_state(state); |
949 | goto restart; | |
1da177e4 | 950 | } |
1da177e4 LT |
951 | } |
952 | switch (status) { | |
953 | default: | |
954 | printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n", | |
3110ff80 | 955 | __func__, status); |
1da177e4 | 956 | case -ENOENT: |
965b5d67 | 957 | case -ENOMEM: |
b79a4a1b | 958 | case -ESTALE: |
1da177e4 LT |
959 | /* |
960 | * Open state on this file cannot be recovered | |
961 | * All we can do is revert to using the zero stateid. | |
962 | */ | |
963 | memset(state->stateid.data, 0, | |
964 | sizeof(state->stateid.data)); | |
965 | /* Mark the file as being 'closed' */ | |
966 | state->state = 0; | |
967 | break; | |
965b5d67 TM |
968 | case -NFS4ERR_ADMIN_REVOKED: |
969 | case -NFS4ERR_STALE_STATEID: | |
970 | case -NFS4ERR_BAD_STATEID: | |
b79a4a1b TM |
971 | case -NFS4ERR_RECLAIM_BAD: |
972 | case -NFS4ERR_RECLAIM_CONFLICT: | |
973 | nfs4_state_mark_reclaim_nograce(sp->so_client, state); | |
974 | break; | |
1da177e4 LT |
975 | case -NFS4ERR_EXPIRED: |
976 | case -NFS4ERR_NO_GRACE: | |
b79a4a1b | 977 | nfs4_state_mark_reclaim_nograce(sp->so_client, state); |
1da177e4 | 978 | case -NFS4ERR_STALE_CLIENTID: |
9c4c761a TM |
979 | case -NFS4ERR_BADSESSION: |
980 | case -NFS4ERR_BADSLOT: | |
981 | case -NFS4ERR_BAD_HIGH_SLOT: | |
982 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: | |
1da177e4 LT |
983 | goto out_err; |
984 | } | |
fe1d8195 TM |
985 | nfs4_put_open_state(state); |
986 | goto restart; | |
1da177e4 | 987 | } |
fe1d8195 | 988 | spin_unlock(&sp->so_lock); |
1da177e4 LT |
989 | return 0; |
990 | out_err: | |
fe1d8195 | 991 | nfs4_put_open_state(state); |
1da177e4 LT |
992 | return status; |
993 | } | |
994 | ||
b79a4a1b TM |
995 | static void nfs4_clear_open_state(struct nfs4_state *state) |
996 | { | |
997 | struct nfs4_lock_state *lock; | |
998 | ||
999 | clear_bit(NFS_DELEGATED_STATE, &state->flags); | |
1000 | clear_bit(NFS_O_RDONLY_STATE, &state->flags); | |
1001 | clear_bit(NFS_O_WRONLY_STATE, &state->flags); | |
1002 | clear_bit(NFS_O_RDWR_STATE, &state->flags); | |
1003 | list_for_each_entry(lock, &state->lock_states, ls_locks) { | |
b79a4a1b TM |
1004 | lock->ls_seqid.flags = 0; |
1005 | lock->ls_flags &= ~NFS_LOCK_INITIALIZED; | |
1006 | } | |
1007 | } | |
1008 | ||
1009 | static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp, int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state)) | |
cee54fc9 TM |
1010 | { |
1011 | struct nfs4_state_owner *sp; | |
9f958ab8 | 1012 | struct rb_node *pos; |
cee54fc9 | 1013 | struct nfs4_state *state; |
cee54fc9 TM |
1014 | |
1015 | /* Reset all sequence ids to zero */ | |
9f958ab8 TM |
1016 | for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) { |
1017 | sp = rb_entry(pos, struct nfs4_state_owner, so_client_node); | |
cee54fc9 | 1018 | sp->so_seqid.flags = 0; |
ec073428 | 1019 | spin_lock(&sp->so_lock); |
cee54fc9 | 1020 | list_for_each_entry(state, &sp->so_states, open_states) { |
b79a4a1b TM |
1021 | if (mark_reclaim(clp, state)) |
1022 | nfs4_clear_open_state(state); | |
cee54fc9 | 1023 | } |
ec073428 | 1024 | spin_unlock(&sp->so_lock); |
cee54fc9 TM |
1025 | } |
1026 | } | |
1027 | ||
b79a4a1b TM |
1028 | static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp) |
1029 | { | |
1030 | /* Mark all delegations for reclaim */ | |
1031 | nfs_delegation_mark_reclaim(clp); | |
1032 | nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot); | |
1033 | } | |
1034 | ||
fce5c838 RL |
1035 | static void nfs4_reclaim_complete(struct nfs_client *clp, |
1036 | const struct nfs4_state_recovery_ops *ops) | |
1037 | { | |
1038 | /* Notify the server we're done reclaiming our state */ | |
1039 | if (ops->reclaim_complete) | |
1040 | (void)ops->reclaim_complete(clp); | |
1041 | } | |
1042 | ||
b79a4a1b TM |
1043 | static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp) |
1044 | { | |
1045 | struct nfs4_state_owner *sp; | |
1046 | struct rb_node *pos; | |
1047 | struct nfs4_state *state; | |
1048 | ||
da6ebfe3 RL |
1049 | nfs4_reclaim_complete(clp, |
1050 | nfs4_reboot_recovery_ops[clp->cl_minorversion]); | |
1051 | ||
b79a4a1b TM |
1052 | if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) |
1053 | return; | |
1054 | ||
1055 | for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) { | |
1056 | sp = rb_entry(pos, struct nfs4_state_owner, so_client_node); | |
1057 | spin_lock(&sp->so_lock); | |
1058 | list_for_each_entry(state, &sp->so_states, open_states) { | |
1059 | if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags)) | |
1060 | continue; | |
1061 | nfs4_state_mark_reclaim_nograce(clp, state); | |
1062 | } | |
1063 | spin_unlock(&sp->so_lock); | |
1064 | } | |
1065 | ||
1066 | nfs_delegation_reap_unclaimed(clp); | |
1067 | } | |
1068 | ||
1069 | static void nfs_delegation_clear_all(struct nfs_client *clp) | |
1070 | { | |
1071 | nfs_delegation_mark_reclaim(clp); | |
1072 | nfs_delegation_reap_unclaimed(clp); | |
1073 | } | |
1074 | ||
1075 | static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp) | |
1076 | { | |
1077 | nfs_delegation_clear_all(clp); | |
1078 | nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce); | |
1079 | } | |
1080 | ||
4f7cdf18 | 1081 | static int nfs4_recovery_handle_error(struct nfs_client *clp, int error) |
e598d843 TM |
1082 | { |
1083 | switch (error) { | |
1084 | case -NFS4ERR_CB_PATH_DOWN: | |
707fb4b3 | 1085 | nfs_handle_cb_pathdown(clp); |
4f7cdf18 | 1086 | return 0; |
c8b7ae3d TM |
1087 | case -NFS4ERR_NO_GRACE: |
1088 | nfs4_state_end_reclaim_reboot(clp); | |
1089 | return 0; | |
e598d843 TM |
1090 | case -NFS4ERR_STALE_CLIENTID: |
1091 | case -NFS4ERR_LEASE_MOVED: | |
1092 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
e345e88a | 1093 | nfs4_state_end_reclaim_reboot(clp); |
e598d843 TM |
1094 | nfs4_state_start_reclaim_reboot(clp); |
1095 | break; | |
1096 | case -NFS4ERR_EXPIRED: | |
1097 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1098 | nfs4_state_start_reclaim_nograce(clp); | |
8ba9bf8e | 1099 | break; |
c3fad1b1 AA |
1100 | case -NFS4ERR_BADSESSION: |
1101 | case -NFS4ERR_BADSLOT: | |
1102 | case -NFS4ERR_BAD_HIGH_SLOT: | |
1103 | case -NFS4ERR_DEADSESSION: | |
1104 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: | |
1105 | case -NFS4ERR_SEQ_FALSE_RETRY: | |
1106 | case -NFS4ERR_SEQ_MISORDERED: | |
6df08189 | 1107 | set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state); |
0b9e2d41 AA |
1108 | /* Zero session reset errors */ |
1109 | return 0; | |
e598d843 | 1110 | } |
4f7cdf18 | 1111 | return error; |
e598d843 TM |
1112 | } |
1113 | ||
02860014 | 1114 | static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops) |
1da177e4 | 1115 | { |
9f958ab8 | 1116 | struct rb_node *pos; |
1da177e4 LT |
1117 | int status = 0; |
1118 | ||
7eff03ae TM |
1119 | restart: |
1120 | spin_lock(&clp->cl_lock); | |
02860014 TM |
1121 | for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) { |
1122 | struct nfs4_state_owner *sp = rb_entry(pos, struct nfs4_state_owner, so_client_node); | |
7eff03ae TM |
1123 | if (!test_and_clear_bit(ops->owner_flag_bit, &sp->so_flags)) |
1124 | continue; | |
1125 | atomic_inc(&sp->so_count); | |
1126 | spin_unlock(&clp->cl_lock); | |
02860014 | 1127 | status = nfs4_reclaim_open_state(sp, ops); |
7eff03ae TM |
1128 | if (status < 0) { |
1129 | set_bit(ops->owner_flag_bit, &sp->so_flags); | |
1130 | nfs4_put_state_owner(sp); | |
4f7cdf18 | 1131 | return nfs4_recovery_handle_error(clp, status); |
7eff03ae TM |
1132 | } |
1133 | nfs4_put_state_owner(sp); | |
1134 | goto restart; | |
02860014 | 1135 | } |
7eff03ae | 1136 | spin_unlock(&clp->cl_lock); |
02860014 TM |
1137 | return status; |
1138 | } | |
1139 | ||
1140 | static int nfs4_check_lease(struct nfs_client *clp) | |
1141 | { | |
1142 | struct rpc_cred *cred; | |
8e69514f BH |
1143 | struct nfs4_state_maintenance_ops *ops = |
1144 | nfs4_state_renewal_ops[clp->cl_minorversion]; | |
02860014 | 1145 | int status = -NFS4ERR_EXPIRED; |
1da177e4 | 1146 | |
0f605b56 TM |
1147 | /* Is the client already known to have an expired lease? */ |
1148 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) | |
1149 | return 0; | |
a7b72103 AA |
1150 | spin_lock(&clp->cl_lock); |
1151 | cred = ops->get_state_renewal_cred_locked(clp); | |
1152 | spin_unlock(&clp->cl_lock); | |
0f605b56 TM |
1153 | if (cred == NULL) { |
1154 | cred = nfs4_get_setclientid_cred(clp); | |
1155 | if (cred == NULL) | |
1156 | goto out; | |
286d7d6a | 1157 | } |
8e69514f | 1158 | status = ops->renew_lease(clp, cred); |
0f605b56 TM |
1159 | put_rpccred(cred); |
1160 | out: | |
4f7cdf18 | 1161 | return nfs4_recovery_handle_error(clp, status); |
02860014 TM |
1162 | } |
1163 | ||
1164 | static int nfs4_reclaim_lease(struct nfs_client *clp) | |
1165 | { | |
1166 | struct rpc_cred *cred; | |
591d71cb AA |
1167 | struct nfs4_state_recovery_ops *ops = |
1168 | nfs4_reboot_recovery_ops[clp->cl_minorversion]; | |
02860014 TM |
1169 | int status = -ENOENT; |
1170 | ||
90a16617 | 1171 | cred = ops->get_clid_cred(clp); |
286d7d6a | 1172 | if (cred != NULL) { |
591d71cb | 1173 | status = ops->establish_clid(clp, cred); |
286d7d6a | 1174 | put_rpccred(cred); |
a2b2bb88 TM |
1175 | /* Handle case where the user hasn't set up machine creds */ |
1176 | if (status == -EACCES && cred == clp->cl_machine_cred) { | |
1177 | nfs4_clear_machine_cred(clp); | |
02860014 | 1178 | status = -EAGAIN; |
a2b2bb88 | 1179 | } |
c2e713dd BH |
1180 | if (status == -NFS4ERR_MINOR_VERS_MISMATCH) |
1181 | status = -EPROTONOSUPPORT; | |
286d7d6a | 1182 | } |
02860014 TM |
1183 | return status; |
1184 | } | |
1185 | ||
76db6d95 | 1186 | #ifdef CONFIG_NFS_V4_1 |
0629e370 AB |
1187 | void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags) |
1188 | { | |
1189 | if (!flags) | |
1190 | return; | |
1191 | else if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED) { | |
1192 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1193 | nfs4_state_start_reclaim_reboot(clp); | |
1194 | nfs4_schedule_state_recovery(clp); | |
1195 | } else if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED | | |
1196 | SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED | | |
1197 | SEQ4_STATUS_ADMIN_STATE_REVOKED | | |
1198 | SEQ4_STATUS_RECALLABLE_STATE_REVOKED | | |
1199 | SEQ4_STATUS_LEASE_MOVED)) { | |
1200 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1201 | nfs4_state_start_reclaim_nograce(clp); | |
1202 | nfs4_schedule_state_recovery(clp); | |
1203 | } else if (flags & (SEQ4_STATUS_CB_PATH_DOWN | | |
1204 | SEQ4_STATUS_BACKCHANNEL_FAULT | | |
1205 | SEQ4_STATUS_CB_PATH_DOWN_SESSION)) | |
1206 | nfs_expire_all_delegations(clp); | |
1207 | } | |
1208 | ||
c3fad1b1 AA |
1209 | static void nfs4_session_recovery_handle_error(struct nfs_client *clp, int err) |
1210 | { | |
1211 | switch (err) { | |
1212 | case -NFS4ERR_STALE_CLIENTID: | |
1213 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
c3fad1b1 AA |
1214 | } |
1215 | } | |
1216 | ||
1217 | static int nfs4_reset_session(struct nfs_client *clp) | |
1218 | { | |
ea028ac9 AA |
1219 | struct nfs4_session *ses = clp->cl_session; |
1220 | struct nfs4_slot_table *tbl = &ses->fc_slot_table; | |
c3fad1b1 AA |
1221 | int status; |
1222 | ||
ea028ac9 | 1223 | spin_lock(&tbl->slot_tbl_lock); |
0556d1a6 | 1224 | set_bit(NFS4CLNT_SESSION_DRAINING, &clp->cl_state); |
ea028ac9 | 1225 | if (tbl->highest_used_slotid != -1) { |
35dc1d74 | 1226 | INIT_COMPLETION(ses->complete); |
ea028ac9 AA |
1227 | spin_unlock(&tbl->slot_tbl_lock); |
1228 | status = wait_for_completion_interruptible(&ses->complete); | |
ea028ac9 AA |
1229 | if (status) /* -ERESTARTSYS */ |
1230 | goto out; | |
1231 | } else { | |
1232 | spin_unlock(&tbl->slot_tbl_lock); | |
1233 | } | |
1234 | ||
c3fad1b1 AA |
1235 | status = nfs4_proc_destroy_session(clp->cl_session); |
1236 | if (status && status != -NFS4ERR_BADSESSION && | |
1237 | status != -NFS4ERR_DEADSESSION) { | |
1238 | nfs4_session_recovery_handle_error(clp, status); | |
1239 | goto out; | |
1240 | } | |
1241 | ||
1242 | memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN); | |
f26468fb | 1243 | status = nfs4_proc_create_session(clp); |
c3fad1b1 AA |
1244 | if (status) |
1245 | nfs4_session_recovery_handle_error(clp, status); | |
1246 | /* fall through*/ | |
1247 | out: | |
1248 | /* Wake up the next rpc task even on error */ | |
0b9e2d41 | 1249 | clear_bit(NFS4CLNT_SESSION_DRAINING, &clp->cl_state); |
35dc1d74 | 1250 | rpc_wake_up(&clp->cl_session->fc_slot_table.slot_tbl_waitq); |
c3fad1b1 AA |
1251 | return status; |
1252 | } | |
76db6d95 | 1253 | |
76db6d95 | 1254 | #else /* CONFIG_NFS_V4_1 */ |
c3fad1b1 | 1255 | static int nfs4_reset_session(struct nfs_client *clp) { return 0; } |
76db6d95 AA |
1256 | #endif /* CONFIG_NFS_V4_1 */ |
1257 | ||
78722e9c AA |
1258 | /* Set NFS4CLNT_LEASE_EXPIRED for all v4.0 errors and for recoverable errors |
1259 | * on EXCHANGE_ID for v4.1 | |
1260 | */ | |
1261 | static void nfs4_set_lease_expired(struct nfs_client *clp, int status) | |
1262 | { | |
1263 | if (nfs4_has_session(clp)) { | |
1264 | switch (status) { | |
1265 | case -NFS4ERR_DELAY: | |
1266 | case -NFS4ERR_CLID_INUSE: | |
1267 | case -EAGAIN: | |
1268 | break; | |
1269 | ||
1270 | case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery | |
1271 | * in nfs4_exchange_id */ | |
1272 | default: | |
1273 | return; | |
1274 | } | |
1275 | } | |
1276 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1277 | } | |
1278 | ||
e005e804 | 1279 | static void nfs4_state_manager(struct nfs_client *clp) |
02860014 | 1280 | { |
02860014 TM |
1281 | int status = 0; |
1282 | ||
02860014 | 1283 | /* Ensure exclusive access to NFSv4 state */ |
f3c76491 | 1284 | for(;;) { |
b79a4a1b TM |
1285 | if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) { |
1286 | /* We're going to have to re-establish a clientid */ | |
1287 | status = nfs4_reclaim_lease(clp); | |
1288 | if (status) { | |
78722e9c | 1289 | nfs4_set_lease_expired(clp, status); |
b6d408ba TM |
1290 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, |
1291 | &clp->cl_state)) | |
b79a4a1b | 1292 | continue; |
76db6d95 AA |
1293 | if (clp->cl_cons_state == |
1294 | NFS_CS_SESSION_INITING) | |
1295 | nfs_mark_client_ready(clp, status); | |
b79a4a1b TM |
1296 | goto out_error; |
1297 | } | |
e598d843 TM |
1298 | clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); |
1299 | } | |
1300 | ||
1301 | if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) { | |
1302 | status = nfs4_check_lease(clp); | |
b6d408ba | 1303 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) |
e598d843 | 1304 | continue; |
b6d408ba TM |
1305 | if (status < 0 && status != -NFS4ERR_CB_PATH_DOWN) |
1306 | goto out_error; | |
b79a4a1b | 1307 | } |
b6d408ba | 1308 | |
c3fad1b1 | 1309 | /* Initialize or reset the session */ |
6df08189 | 1310 | if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) |
7111dc73 | 1311 | && nfs4_has_session(clp)) { |
4d643d1d | 1312 | status = nfs4_reset_session(clp); |
b6d408ba TM |
1313 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) |
1314 | continue; | |
1315 | if (status < 0) | |
76db6d95 | 1316 | goto out_error; |
76db6d95 | 1317 | } |
b6d408ba | 1318 | |
b79a4a1b | 1319 | /* First recover reboot state... */ |
e345e88a | 1320 | if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) { |
591d71cb AA |
1321 | status = nfs4_do_reclaim(clp, |
1322 | nfs4_reboot_recovery_ops[clp->cl_minorversion]); | |
b6d408ba | 1323 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) || |
6df08189 | 1324 | test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) |
c3fad1b1 | 1325 | continue; |
b79a4a1b | 1326 | nfs4_state_end_reclaim_reboot(clp); |
b6d408ba TM |
1327 | if (test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) |
1328 | continue; | |
1329 | if (status < 0) | |
1330 | goto out_error; | |
02860014 TM |
1331 | } |
1332 | ||
b79a4a1b TM |
1333 | /* Now recover expired state... */ |
1334 | if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) { | |
591d71cb AA |
1335 | status = nfs4_do_reclaim(clp, |
1336 | nfs4_nograce_recovery_ops[clp->cl_minorversion]); | |
b6d408ba | 1337 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) || |
6df08189 | 1338 | test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) || |
b6d408ba TM |
1339 | test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) |
1340 | continue; | |
1341 | if (status < 0) | |
b79a4a1b | 1342 | goto out_error; |
1da177e4 | 1343 | } |
707fb4b3 TM |
1344 | |
1345 | if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) { | |
1346 | nfs_client_return_marked_delegations(clp); | |
1347 | continue; | |
1348 | } | |
e005e804 TM |
1349 | |
1350 | nfs4_clear_state_manager_bit(clp); | |
f3c76491 TM |
1351 | /* Did we race with an attempt to give us more work? */ |
1352 | if (clp->cl_state == 0) | |
1353 | break; | |
1354 | if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0) | |
1355 | break; | |
1da177e4 | 1356 | } |
e005e804 | 1357 | return; |
1da177e4 | 1358 | out_error: |
e005e804 | 1359 | printk(KERN_WARNING "Error: state manager failed on NFSv4 server %s" |
5d8515ca | 1360 | " with error %d\n", clp->cl_hostname, -status); |
e005e804 TM |
1361 | nfs4_clear_state_manager_bit(clp); |
1362 | } | |
1363 | ||
1364 | static int nfs4_run_state_manager(void *ptr) | |
1365 | { | |
1366 | struct nfs_client *clp = ptr; | |
1367 | ||
1368 | allow_signal(SIGKILL); | |
1369 | nfs4_state_manager(clp); | |
1370 | nfs_put_client(clp); | |
1371 | module_put_and_exit(0); | |
1372 | return 0; | |
1da177e4 LT |
1373 | } |
1374 | ||
1375 | /* | |
1376 | * Local variables: | |
1377 | * c-basic-offset: 8 | |
1378 | * End: | |
1379 | */ |