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 | ||
adfa6f98 | 63 | static int nfs4_init_client(struct nfs_client *clp, struct rpc_cred *cred) |
1da177e4 | 64 | { |
286d7d6a TM |
65 | int status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, |
66 | nfs_callback_tcpport, cred); | |
1da177e4 | 67 | if (status == 0) |
286d7d6a | 68 | status = nfs4_proc_setclientid_confirm(clp, cred); |
1da177e4 LT |
69 | if (status == 0) |
70 | nfs4_schedule_state_renewal(clp); | |
71 | return status; | |
72 | } | |
73 | ||
6dc9d57a | 74 | static struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp) |
a2b2bb88 TM |
75 | { |
76 | struct rpc_cred *cred = NULL; | |
77 | ||
a2b2bb88 TM |
78 | if (clp->cl_machine_cred != NULL) |
79 | cred = get_rpccred(clp->cl_machine_cred); | |
a2b2bb88 TM |
80 | return cred; |
81 | } | |
82 | ||
83 | static void nfs4_clear_machine_cred(struct nfs_client *clp) | |
84 | { | |
85 | struct rpc_cred *cred; | |
86 | ||
87 | spin_lock(&clp->cl_lock); | |
88 | cred = clp->cl_machine_cred; | |
89 | clp->cl_machine_cred = NULL; | |
90 | spin_unlock(&clp->cl_lock); | |
91 | if (cred != NULL) | |
92 | put_rpccred(cred); | |
93 | } | |
94 | ||
6dc9d57a | 95 | struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp) |
b4454fe1 TM |
96 | { |
97 | struct nfs4_state_owner *sp; | |
9f958ab8 | 98 | struct rb_node *pos; |
b4454fe1 TM |
99 | struct rpc_cred *cred = NULL; |
100 | ||
9f958ab8 TM |
101 | for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) { |
102 | sp = rb_entry(pos, struct nfs4_state_owner, so_client_node); | |
b4454fe1 TM |
103 | if (list_empty(&sp->so_states)) |
104 | continue; | |
105 | cred = get_rpccred(sp->so_cred); | |
106 | break; | |
107 | } | |
108 | return cred; | |
109 | } | |
110 | ||
6dc9d57a TM |
111 | static struct rpc_cred *nfs4_get_renew_cred(struct nfs_client *clp) |
112 | { | |
113 | struct rpc_cred *cred; | |
114 | ||
115 | spin_lock(&clp->cl_lock); | |
116 | cred = nfs4_get_renew_cred_locked(clp); | |
117 | spin_unlock(&clp->cl_lock); | |
118 | return cred; | |
119 | } | |
120 | ||
10afec90 | 121 | static struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp) |
286d7d6a TM |
122 | { |
123 | struct nfs4_state_owner *sp; | |
9f958ab8 | 124 | struct rb_node *pos; |
a2b2bb88 | 125 | struct rpc_cred *cred; |
286d7d6a | 126 | |
6dc9d57a TM |
127 | spin_lock(&clp->cl_lock); |
128 | cred = nfs4_get_machine_cred_locked(clp); | |
a2b2bb88 TM |
129 | if (cred != NULL) |
130 | goto out; | |
9f958ab8 TM |
131 | pos = rb_first(&clp->cl_state_owners); |
132 | if (pos != NULL) { | |
133 | sp = rb_entry(pos, struct nfs4_state_owner, so_client_node); | |
a2b2bb88 | 134 | cred = get_rpccred(sp->so_cred); |
286d7d6a | 135 | } |
a2b2bb88 | 136 | out: |
6dc9d57a | 137 | spin_unlock(&clp->cl_lock); |
a2b2bb88 | 138 | return cred; |
286d7d6a TM |
139 | } |
140 | ||
9f958ab8 TM |
141 | static void nfs_alloc_unique_id(struct rb_root *root, struct nfs_unique_id *new, |
142 | __u64 minval, int maxbits) | |
143 | { | |
144 | struct rb_node **p, *parent; | |
145 | struct nfs_unique_id *pos; | |
146 | __u64 mask = ~0ULL; | |
147 | ||
148 | if (maxbits < 64) | |
149 | mask = (1ULL << maxbits) - 1ULL; | |
150 | ||
151 | /* Ensure distribution is more or less flat */ | |
152 | get_random_bytes(&new->id, sizeof(new->id)); | |
153 | new->id &= mask; | |
154 | if (new->id < minval) | |
155 | new->id += minval; | |
156 | retry: | |
157 | p = &root->rb_node; | |
158 | parent = NULL; | |
159 | ||
160 | while (*p != NULL) { | |
161 | parent = *p; | |
162 | pos = rb_entry(parent, struct nfs_unique_id, rb_node); | |
163 | ||
164 | if (new->id < pos->id) | |
165 | p = &(*p)->rb_left; | |
166 | else if (new->id > pos->id) | |
167 | p = &(*p)->rb_right; | |
168 | else | |
169 | goto id_exists; | |
170 | } | |
171 | rb_link_node(&new->rb_node, parent, p); | |
172 | rb_insert_color(&new->rb_node, root); | |
173 | return; | |
174 | id_exists: | |
175 | for (;;) { | |
176 | new->id++; | |
177 | if (new->id < minval || (new->id & mask) != new->id) { | |
178 | new->id = minval; | |
179 | break; | |
180 | } | |
181 | parent = rb_next(parent); | |
182 | if (parent == NULL) | |
183 | break; | |
184 | pos = rb_entry(parent, struct nfs_unique_id, rb_node); | |
185 | if (new->id < pos->id) | |
186 | break; | |
187 | } | |
188 | goto retry; | |
189 | } | |
190 | ||
191 | static void nfs_free_unique_id(struct rb_root *root, struct nfs_unique_id *id) | |
192 | { | |
193 | rb_erase(&id->rb_node, root); | |
194 | } | |
195 | ||
1da177e4 | 196 | static struct nfs4_state_owner * |
6f2e64d3 | 197 | nfs4_find_state_owner(struct nfs_server *server, struct rpc_cred *cred) |
1da177e4 | 198 | { |
6f2e64d3 | 199 | struct nfs_client *clp = server->nfs_client; |
9f958ab8 TM |
200 | struct rb_node **p = &clp->cl_state_owners.rb_node, |
201 | *parent = NULL; | |
1da177e4 LT |
202 | struct nfs4_state_owner *sp, *res = NULL; |
203 | ||
9f958ab8 TM |
204 | while (*p != NULL) { |
205 | parent = *p; | |
206 | sp = rb_entry(parent, struct nfs4_state_owner, so_client_node); | |
207 | ||
6f2e64d3 TM |
208 | if (server < sp->so_server) { |
209 | p = &parent->rb_left; | |
210 | continue; | |
211 | } | |
212 | if (server > sp->so_server) { | |
213 | p = &parent->rb_right; | |
214 | continue; | |
215 | } | |
9f958ab8 TM |
216 | if (cred < sp->so_cred) |
217 | p = &parent->rb_left; | |
218 | else if (cred > sp->so_cred) | |
219 | p = &parent->rb_right; | |
220 | else { | |
221 | atomic_inc(&sp->so_count); | |
222 | res = sp; | |
223 | break; | |
224 | } | |
1da177e4 LT |
225 | } |
226 | return res; | |
227 | } | |
228 | ||
9f958ab8 TM |
229 | static struct nfs4_state_owner * |
230 | nfs4_insert_state_owner(struct nfs_client *clp, struct nfs4_state_owner *new) | |
231 | { | |
232 | struct rb_node **p = &clp->cl_state_owners.rb_node, | |
233 | *parent = NULL; | |
234 | struct nfs4_state_owner *sp; | |
235 | ||
236 | while (*p != NULL) { | |
237 | parent = *p; | |
238 | sp = rb_entry(parent, struct nfs4_state_owner, so_client_node); | |
239 | ||
6f2e64d3 TM |
240 | if (new->so_server < sp->so_server) { |
241 | p = &parent->rb_left; | |
242 | continue; | |
243 | } | |
244 | if (new->so_server > sp->so_server) { | |
245 | p = &parent->rb_right; | |
246 | continue; | |
247 | } | |
9f958ab8 TM |
248 | if (new->so_cred < sp->so_cred) |
249 | p = &parent->rb_left; | |
250 | else if (new->so_cred > sp->so_cred) | |
251 | p = &parent->rb_right; | |
252 | else { | |
253 | atomic_inc(&sp->so_count); | |
254 | return sp; | |
255 | } | |
256 | } | |
257 | nfs_alloc_unique_id(&clp->cl_openowner_id, &new->so_owner_id, 1, 64); | |
258 | rb_link_node(&new->so_client_node, parent, p); | |
259 | rb_insert_color(&new->so_client_node, &clp->cl_state_owners); | |
260 | return new; | |
261 | } | |
262 | ||
263 | static void | |
264 | nfs4_remove_state_owner(struct nfs_client *clp, struct nfs4_state_owner *sp) | |
265 | { | |
266 | if (!RB_EMPTY_NODE(&sp->so_client_node)) | |
267 | rb_erase(&sp->so_client_node, &clp->cl_state_owners); | |
268 | nfs_free_unique_id(&clp->cl_openowner_id, &sp->so_owner_id); | |
269 | } | |
270 | ||
1da177e4 LT |
271 | /* |
272 | * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to | |
273 | * create a new state_owner. | |
274 | * | |
275 | */ | |
276 | static struct nfs4_state_owner * | |
277 | nfs4_alloc_state_owner(void) | |
278 | { | |
279 | struct nfs4_state_owner *sp; | |
280 | ||
cee54fc9 | 281 | sp = kzalloc(sizeof(*sp),GFP_KERNEL); |
1da177e4 LT |
282 | if (!sp) |
283 | return NULL; | |
ec073428 | 284 | spin_lock_init(&sp->so_lock); |
1da177e4 LT |
285 | INIT_LIST_HEAD(&sp->so_states); |
286 | INIT_LIST_HEAD(&sp->so_delegations); | |
cee54fc9 TM |
287 | rpc_init_wait_queue(&sp->so_sequence.wait, "Seqid_waitqueue"); |
288 | sp->so_seqid.sequence = &sp->so_sequence; | |
289 | spin_lock_init(&sp->so_sequence.lock); | |
290 | INIT_LIST_HEAD(&sp->so_sequence.list); | |
1da177e4 LT |
291 | atomic_set(&sp->so_count, 1); |
292 | return sp; | |
293 | } | |
294 | ||
1d2e88e7 | 295 | static void |
1da177e4 LT |
296 | nfs4_drop_state_owner(struct nfs4_state_owner *sp) |
297 | { | |
9f958ab8 TM |
298 | if (!RB_EMPTY_NODE(&sp->so_client_node)) { |
299 | struct nfs_client *clp = sp->so_client; | |
300 | ||
301 | spin_lock(&clp->cl_lock); | |
302 | rb_erase(&sp->so_client_node, &clp->cl_state_owners); | |
303 | RB_CLEAR_NODE(&sp->so_client_node); | |
304 | spin_unlock(&clp->cl_lock); | |
305 | } | |
1da177e4 LT |
306 | } |
307 | ||
308 | /* | |
309 | * Note: must be called with clp->cl_sem held in order to prevent races | |
310 | * with reboot recovery! | |
311 | */ | |
312 | struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server, struct rpc_cred *cred) | |
313 | { | |
7539bbab | 314 | struct nfs_client *clp = server->nfs_client; |
1da177e4 LT |
315 | struct nfs4_state_owner *sp, *new; |
316 | ||
1da177e4 | 317 | spin_lock(&clp->cl_lock); |
6f2e64d3 | 318 | sp = nfs4_find_state_owner(server, cred); |
1da177e4 | 319 | spin_unlock(&clp->cl_lock); |
1da177e4 LT |
320 | if (sp != NULL) |
321 | return sp; | |
9f958ab8 TM |
322 | new = nfs4_alloc_state_owner(); |
323 | if (new == NULL) | |
324 | return NULL; | |
325 | new->so_client = clp; | |
6f2e64d3 | 326 | new->so_server = server; |
9f958ab8 TM |
327 | new->so_cred = cred; |
328 | spin_lock(&clp->cl_lock); | |
329 | sp = nfs4_insert_state_owner(clp, new); | |
330 | spin_unlock(&clp->cl_lock); | |
331 | if (sp == new) | |
332 | get_rpccred(cred); | |
f6a1cc89 TM |
333 | else { |
334 | rpc_destroy_wait_queue(&new->so_sequence.wait); | |
9f958ab8 | 335 | kfree(new); |
f6a1cc89 | 336 | } |
9f958ab8 | 337 | return sp; |
1da177e4 LT |
338 | } |
339 | ||
340 | /* | |
341 | * Must be called with clp->cl_sem held in order to avoid races | |
342 | * with state recovery... | |
343 | */ | |
344 | void nfs4_put_state_owner(struct nfs4_state_owner *sp) | |
345 | { | |
adfa6f98 | 346 | struct nfs_client *clp = sp->so_client; |
1da177e4 LT |
347 | struct rpc_cred *cred = sp->so_cred; |
348 | ||
349 | if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock)) | |
350 | return; | |
9f958ab8 | 351 | nfs4_remove_state_owner(clp, sp); |
1da177e4 | 352 | spin_unlock(&clp->cl_lock); |
f6a1cc89 | 353 | rpc_destroy_wait_queue(&sp->so_sequence.wait); |
1da177e4 LT |
354 | put_rpccred(cred); |
355 | kfree(sp); | |
356 | } | |
357 | ||
358 | static struct nfs4_state * | |
359 | nfs4_alloc_open_state(void) | |
360 | { | |
361 | struct nfs4_state *state; | |
362 | ||
e7616923 | 363 | state = kzalloc(sizeof(*state), GFP_KERNEL); |
1da177e4 LT |
364 | if (!state) |
365 | return NULL; | |
1da177e4 LT |
366 | atomic_set(&state->count, 1); |
367 | INIT_LIST_HEAD(&state->lock_states); | |
8d0a8a9d | 368 | spin_lock_init(&state->state_lock); |
8bda4e4c | 369 | seqlock_init(&state->seqlock); |
1da177e4 LT |
370 | return state; |
371 | } | |
372 | ||
4cecb76f TM |
373 | void |
374 | nfs4_state_set_mode_locked(struct nfs4_state *state, mode_t mode) | |
375 | { | |
376 | if (state->state == mode) | |
377 | return; | |
378 | /* NB! List reordering - see the reclaim code for why. */ | |
379 | if ((mode & FMODE_WRITE) != (state->state & FMODE_WRITE)) { | |
380 | if (mode & FMODE_WRITE) | |
381 | list_move(&state->open_states, &state->owner->so_states); | |
382 | else | |
383 | list_move_tail(&state->open_states, &state->owner->so_states); | |
384 | } | |
4cecb76f TM |
385 | state->state = mode; |
386 | } | |
387 | ||
1da177e4 LT |
388 | static struct nfs4_state * |
389 | __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner) | |
390 | { | |
391 | struct nfs_inode *nfsi = NFS_I(inode); | |
392 | struct nfs4_state *state; | |
393 | ||
394 | list_for_each_entry(state, &nfsi->open_states, inode_states) { | |
1c816efa | 395 | if (state->owner != owner) |
1da177e4 | 396 | continue; |
1c816efa | 397 | if (atomic_inc_not_zero(&state->count)) |
1da177e4 | 398 | return state; |
1da177e4 LT |
399 | } |
400 | return NULL; | |
401 | } | |
402 | ||
1da177e4 LT |
403 | static void |
404 | nfs4_free_open_state(struct nfs4_state *state) | |
405 | { | |
406 | kfree(state); | |
407 | } | |
408 | ||
409 | struct nfs4_state * | |
410 | nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner) | |
411 | { | |
412 | struct nfs4_state *state, *new; | |
413 | struct nfs_inode *nfsi = NFS_I(inode); | |
414 | ||
415 | spin_lock(&inode->i_lock); | |
416 | state = __nfs4_find_state_byowner(inode, owner); | |
417 | spin_unlock(&inode->i_lock); | |
418 | if (state) | |
419 | goto out; | |
420 | new = nfs4_alloc_open_state(); | |
ec073428 | 421 | spin_lock(&owner->so_lock); |
1da177e4 LT |
422 | spin_lock(&inode->i_lock); |
423 | state = __nfs4_find_state_byowner(inode, owner); | |
424 | if (state == NULL && new != NULL) { | |
425 | state = new; | |
1da177e4 LT |
426 | state->owner = owner; |
427 | atomic_inc(&owner->so_count); | |
428 | list_add(&state->inode_states, &nfsi->open_states); | |
429 | state->inode = igrab(inode); | |
430 | spin_unlock(&inode->i_lock); | |
ec073428 TM |
431 | /* Note: The reclaim code dictates that we add stateless |
432 | * and read-only stateids to the end of the list */ | |
433 | list_add_tail(&state->open_states, &owner->so_states); | |
434 | spin_unlock(&owner->so_lock); | |
1da177e4 LT |
435 | } else { |
436 | spin_unlock(&inode->i_lock); | |
ec073428 | 437 | spin_unlock(&owner->so_lock); |
1da177e4 LT |
438 | if (new) |
439 | nfs4_free_open_state(new); | |
440 | } | |
441 | out: | |
442 | return state; | |
443 | } | |
444 | ||
445 | /* | |
446 | * Beware! Caller must be holding exactly one | |
e6dfa553 | 447 | * reference to clp->cl_sem! |
1da177e4 LT |
448 | */ |
449 | void nfs4_put_open_state(struct nfs4_state *state) | |
450 | { | |
451 | struct inode *inode = state->inode; | |
452 | struct nfs4_state_owner *owner = state->owner; | |
453 | ||
ec073428 | 454 | if (!atomic_dec_and_lock(&state->count, &owner->so_lock)) |
1da177e4 | 455 | return; |
ec073428 | 456 | spin_lock(&inode->i_lock); |
ba683031 | 457 | list_del(&state->inode_states); |
1da177e4 | 458 | list_del(&state->open_states); |
ec073428 TM |
459 | spin_unlock(&inode->i_lock); |
460 | spin_unlock(&owner->so_lock); | |
1da177e4 | 461 | iput(inode); |
1da177e4 LT |
462 | nfs4_free_open_state(state); |
463 | nfs4_put_state_owner(owner); | |
464 | } | |
465 | ||
466 | /* | |
83c9d41e | 467 | * Close the current file. |
1da177e4 | 468 | */ |
a49c3c77 | 469 | static void __nfs4_close(struct path *path, struct nfs4_state *state, mode_t mode, int wait) |
1da177e4 | 470 | { |
1da177e4 | 471 | struct nfs4_state_owner *owner = state->owner; |
003707c7 TM |
472 | int call_close = 0; |
473 | int newstate; | |
1da177e4 LT |
474 | |
475 | atomic_inc(&owner->so_count); | |
1da177e4 | 476 | /* Protect against nfs4_find_state() */ |
ec073428 | 477 | spin_lock(&owner->so_lock); |
e7616923 TM |
478 | switch (mode & (FMODE_READ | FMODE_WRITE)) { |
479 | case FMODE_READ: | |
480 | state->n_rdonly--; | |
481 | break; | |
482 | case FMODE_WRITE: | |
483 | state->n_wronly--; | |
484 | break; | |
485 | case FMODE_READ|FMODE_WRITE: | |
486 | state->n_rdwr--; | |
487 | } | |
003707c7 | 488 | newstate = FMODE_READ|FMODE_WRITE; |
e7616923 | 489 | if (state->n_rdwr == 0) { |
003707c7 | 490 | if (state->n_rdonly == 0) { |
e7616923 | 491 | newstate &= ~FMODE_READ; |
003707c7 TM |
492 | call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags); |
493 | call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); | |
494 | } | |
495 | if (state->n_wronly == 0) { | |
e7616923 | 496 | newstate &= ~FMODE_WRITE; |
003707c7 TM |
497 | call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags); |
498 | call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); | |
499 | } | |
500 | if (newstate == 0) | |
501 | clear_bit(NFS_DELEGATED_STATE, &state->flags); | |
e7616923 | 502 | } |
003707c7 | 503 | nfs4_state_set_mode_locked(state, newstate); |
ec073428 | 504 | spin_unlock(&owner->so_lock); |
4cecb76f | 505 | |
003707c7 | 506 | if (!call_close) { |
b39e625b TM |
507 | nfs4_put_open_state(state); |
508 | nfs4_put_state_owner(owner); | |
509 | } else | |
a49c3c77 TM |
510 | nfs4_do_close(path, state, wait); |
511 | } | |
512 | ||
513 | void nfs4_close_state(struct path *path, struct nfs4_state *state, mode_t mode) | |
514 | { | |
515 | __nfs4_close(path, state, mode, 0); | |
516 | } | |
517 | ||
518 | void nfs4_close_sync(struct path *path, struct nfs4_state *state, mode_t mode) | |
519 | { | |
520 | __nfs4_close(path, state, mode, 1); | |
1da177e4 LT |
521 | } |
522 | ||
523 | /* | |
524 | * Search the state->lock_states for an existing lock_owner | |
525 | * that is compatible with current->files | |
526 | */ | |
527 | static struct nfs4_lock_state * | |
528 | __nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner) | |
529 | { | |
530 | struct nfs4_lock_state *pos; | |
531 | list_for_each_entry(pos, &state->lock_states, ls_locks) { | |
532 | if (pos->ls_owner != fl_owner) | |
533 | continue; | |
534 | atomic_inc(&pos->ls_count); | |
535 | return pos; | |
536 | } | |
537 | return NULL; | |
538 | } | |
539 | ||
1da177e4 LT |
540 | /* |
541 | * Return a compatible lock_state. If no initialized lock_state structure | |
542 | * exists, return an uninitialized one. | |
543 | * | |
1da177e4 LT |
544 | */ |
545 | static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner) | |
546 | { | |
547 | struct nfs4_lock_state *lsp; | |
adfa6f98 | 548 | struct nfs_client *clp = state->owner->so_client; |
1da177e4 | 549 | |
cee54fc9 | 550 | lsp = kzalloc(sizeof(*lsp), GFP_KERNEL); |
1da177e4 LT |
551 | if (lsp == NULL) |
552 | return NULL; | |
d0dc3701 TM |
553 | rpc_init_wait_queue(&lsp->ls_sequence.wait, "lock_seqid_waitqueue"); |
554 | spin_lock_init(&lsp->ls_sequence.lock); | |
555 | INIT_LIST_HEAD(&lsp->ls_sequence.list); | |
556 | lsp->ls_seqid.sequence = &lsp->ls_sequence; | |
1da177e4 LT |
557 | atomic_set(&lsp->ls_count, 1); |
558 | lsp->ls_owner = fl_owner; | |
1da177e4 | 559 | spin_lock(&clp->cl_lock); |
9f958ab8 | 560 | nfs_alloc_unique_id(&clp->cl_lockowner_id, &lsp->ls_id, 1, 64); |
1da177e4 | 561 | spin_unlock(&clp->cl_lock); |
8d0a8a9d | 562 | INIT_LIST_HEAD(&lsp->ls_locks); |
1da177e4 LT |
563 | return lsp; |
564 | } | |
565 | ||
9f958ab8 TM |
566 | static void nfs4_free_lock_state(struct nfs4_lock_state *lsp) |
567 | { | |
568 | struct nfs_client *clp = lsp->ls_state->owner->so_client; | |
569 | ||
570 | spin_lock(&clp->cl_lock); | |
571 | nfs_free_unique_id(&clp->cl_lockowner_id, &lsp->ls_id); | |
572 | spin_unlock(&clp->cl_lock); | |
f6a1cc89 | 573 | rpc_destroy_wait_queue(&lsp->ls_sequence.wait); |
9f958ab8 TM |
574 | kfree(lsp); |
575 | } | |
576 | ||
1da177e4 LT |
577 | /* |
578 | * Return a compatible lock_state. If no initialized lock_state structure | |
579 | * exists, return an uninitialized one. | |
580 | * | |
e6dfa553 | 581 | * The caller must be holding clp->cl_sem |
1da177e4 | 582 | */ |
8d0a8a9d | 583 | static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner) |
1da177e4 | 584 | { |
8d0a8a9d | 585 | struct nfs4_lock_state *lsp, *new = NULL; |
1da177e4 | 586 | |
8d0a8a9d TM |
587 | for(;;) { |
588 | spin_lock(&state->state_lock); | |
589 | lsp = __nfs4_find_lock_state(state, owner); | |
590 | if (lsp != NULL) | |
591 | break; | |
592 | if (new != NULL) { | |
593 | new->ls_state = state; | |
594 | list_add(&new->ls_locks, &state->lock_states); | |
595 | set_bit(LK_STATE_IN_USE, &state->flags); | |
596 | lsp = new; | |
597 | new = NULL; | |
598 | break; | |
599 | } | |
600 | spin_unlock(&state->state_lock); | |
601 | new = nfs4_alloc_lock_state(state, owner); | |
602 | if (new == NULL) | |
603 | return NULL; | |
604 | } | |
605 | spin_unlock(&state->state_lock); | |
9f958ab8 TM |
606 | if (new != NULL) |
607 | nfs4_free_lock_state(new); | |
1da177e4 LT |
608 | return lsp; |
609 | } | |
610 | ||
611 | /* | |
8d0a8a9d TM |
612 | * Release reference to lock_state, and free it if we see that |
613 | * it is no longer in use | |
1da177e4 | 614 | */ |
faf5f49c | 615 | void nfs4_put_lock_state(struct nfs4_lock_state *lsp) |
1da177e4 | 616 | { |
8d0a8a9d | 617 | struct nfs4_state *state; |
1da177e4 | 618 | |
8d0a8a9d TM |
619 | if (lsp == NULL) |
620 | return; | |
621 | state = lsp->ls_state; | |
622 | if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock)) | |
623 | return; | |
624 | list_del(&lsp->ls_locks); | |
625 | if (list_empty(&state->lock_states)) | |
626 | clear_bit(LK_STATE_IN_USE, &state->flags); | |
627 | spin_unlock(&state->state_lock); | |
9f958ab8 | 628 | nfs4_free_lock_state(lsp); |
1da177e4 LT |
629 | } |
630 | ||
8d0a8a9d | 631 | static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src) |
1da177e4 | 632 | { |
8d0a8a9d | 633 | struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner; |
1da177e4 | 634 | |
8d0a8a9d TM |
635 | dst->fl_u.nfs4_fl.owner = lsp; |
636 | atomic_inc(&lsp->ls_count); | |
637 | } | |
1da177e4 | 638 | |
8d0a8a9d | 639 | static void nfs4_fl_release_lock(struct file_lock *fl) |
1da177e4 | 640 | { |
8d0a8a9d | 641 | nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner); |
1da177e4 LT |
642 | } |
643 | ||
8d0a8a9d TM |
644 | static struct file_lock_operations nfs4_fl_lock_ops = { |
645 | .fl_copy_lock = nfs4_fl_copy_lock, | |
646 | .fl_release_private = nfs4_fl_release_lock, | |
647 | }; | |
648 | ||
649 | int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl) | |
1da177e4 | 650 | { |
8d0a8a9d TM |
651 | struct nfs4_lock_state *lsp; |
652 | ||
653 | if (fl->fl_ops != NULL) | |
654 | return 0; | |
655 | lsp = nfs4_get_lock_state(state, fl->fl_owner); | |
656 | if (lsp == NULL) | |
657 | return -ENOMEM; | |
658 | fl->fl_u.nfs4_fl.owner = lsp; | |
659 | fl->fl_ops = &nfs4_fl_lock_ops; | |
660 | return 0; | |
1da177e4 LT |
661 | } |
662 | ||
8d0a8a9d TM |
663 | /* |
664 | * Byte-range lock aware utility to initialize the stateid of read/write | |
665 | * requests. | |
1da177e4 | 666 | */ |
8d0a8a9d | 667 | void nfs4_copy_stateid(nfs4_stateid *dst, struct nfs4_state *state, fl_owner_t fl_owner) |
1da177e4 | 668 | { |
8d0a8a9d | 669 | struct nfs4_lock_state *lsp; |
8bda4e4c | 670 | int seq; |
1da177e4 | 671 | |
8bda4e4c TM |
672 | do { |
673 | seq = read_seqbegin(&state->seqlock); | |
674 | memcpy(dst, &state->stateid, sizeof(*dst)); | |
675 | } while (read_seqretry(&state->seqlock, seq)); | |
8d0a8a9d TM |
676 | if (test_bit(LK_STATE_IN_USE, &state->flags) == 0) |
677 | return; | |
1da177e4 | 678 | |
8d0a8a9d TM |
679 | spin_lock(&state->state_lock); |
680 | lsp = __nfs4_find_lock_state(state, fl_owner); | |
681 | if (lsp != NULL && (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0) | |
682 | memcpy(dst, &lsp->ls_stateid, sizeof(*dst)); | |
683 | spin_unlock(&state->state_lock); | |
1da177e4 LT |
684 | nfs4_put_lock_state(lsp); |
685 | } | |
686 | ||
cee54fc9 TM |
687 | struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter) |
688 | { | |
cee54fc9 TM |
689 | struct nfs_seqid *new; |
690 | ||
691 | new = kmalloc(sizeof(*new), GFP_KERNEL); | |
692 | if (new != NULL) { | |
693 | new->sequence = counter; | |
2f74c0a0 | 694 | INIT_LIST_HEAD(&new->list); |
cee54fc9 TM |
695 | } |
696 | return new; | |
697 | } | |
698 | ||
699 | void nfs_free_seqid(struct nfs_seqid *seqid) | |
1da177e4 | 700 | { |
2f74c0a0 TM |
701 | if (!list_empty(&seqid->list)) { |
702 | struct rpc_sequence *sequence = seqid->sequence->sequence; | |
cee54fc9 | 703 | |
2f74c0a0 TM |
704 | spin_lock(&sequence->lock); |
705 | list_del(&seqid->list); | |
706 | spin_unlock(&sequence->lock); | |
707 | rpc_wake_up(&sequence->wait); | |
708 | } | |
cee54fc9 | 709 | kfree(seqid); |
1da177e4 LT |
710 | } |
711 | ||
712 | /* | |
cee54fc9 TM |
713 | * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or |
714 | * failed with a seqid incrementing error - | |
715 | * see comments nfs_fs.h:seqid_mutating_error() | |
716 | */ | |
88d90939 | 717 | static void nfs_increment_seqid(int status, struct nfs_seqid *seqid) |
cee54fc9 | 718 | { |
2f74c0a0 | 719 | BUG_ON(list_first_entry(&seqid->sequence->sequence->list, struct nfs_seqid, list) != seqid); |
cee54fc9 TM |
720 | switch (status) { |
721 | case 0: | |
722 | break; | |
723 | case -NFS4ERR_BAD_SEQID: | |
6f43ddcc TM |
724 | if (seqid->sequence->flags & NFS_SEQID_CONFIRMED) |
725 | return; | |
726 | printk(KERN_WARNING "NFS: v4 server returned a bad" | |
497799e7 DM |
727 | " sequence-id error on an" |
728 | " unconfirmed sequence %p!\n", | |
6f43ddcc | 729 | seqid->sequence); |
cee54fc9 TM |
730 | case -NFS4ERR_STALE_CLIENTID: |
731 | case -NFS4ERR_STALE_STATEID: | |
732 | case -NFS4ERR_BAD_STATEID: | |
733 | case -NFS4ERR_BADXDR: | |
734 | case -NFS4ERR_RESOURCE: | |
735 | case -NFS4ERR_NOFILEHANDLE: | |
736 | /* Non-seqid mutating errors */ | |
737 | return; | |
738 | }; | |
739 | /* | |
740 | * Note: no locking needed as we are guaranteed to be first | |
741 | * on the sequence list | |
742 | */ | |
743 | seqid->sequence->counter++; | |
744 | } | |
745 | ||
746 | void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid) | |
747 | { | |
748 | if (status == -NFS4ERR_BAD_SEQID) { | |
749 | struct nfs4_state_owner *sp = container_of(seqid->sequence, | |
750 | struct nfs4_state_owner, so_seqid); | |
1da177e4 | 751 | nfs4_drop_state_owner(sp); |
cee54fc9 | 752 | } |
88d90939 | 753 | nfs_increment_seqid(status, seqid); |
cee54fc9 TM |
754 | } |
755 | ||
756 | /* | |
cee54fc9 TM |
757 | * Increment the seqid if the LOCK/LOCKU succeeded, or |
758 | * failed with a seqid incrementing error - | |
759 | * see comments nfs_fs.h:seqid_mutating_error() | |
760 | */ | |
761 | void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid) | |
762 | { | |
88d90939 | 763 | nfs_increment_seqid(status, seqid); |
cee54fc9 TM |
764 | } |
765 | ||
766 | int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task) | |
767 | { | |
768 | struct rpc_sequence *sequence = seqid->sequence->sequence; | |
769 | int status = 0; | |
770 | ||
771 | spin_lock(&sequence->lock); | |
2f74c0a0 TM |
772 | if (list_empty(&seqid->list)) |
773 | list_add_tail(&seqid->list, &sequence->list); | |
774 | if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid) | |
775 | goto unlock; | |
5d00837b | 776 | rpc_sleep_on(&sequence->wait, task, NULL); |
2f74c0a0 TM |
777 | status = -EAGAIN; |
778 | unlock: | |
cee54fc9 TM |
779 | spin_unlock(&sequence->lock); |
780 | return status; | |
1da177e4 LT |
781 | } |
782 | ||
783 | static int reclaimer(void *); | |
1da177e4 | 784 | |
adfa6f98 | 785 | static inline void nfs4_clear_recover_bit(struct nfs_client *clp) |
433fbe4c TM |
786 | { |
787 | smp_mb__before_clear_bit(); | |
788 | clear_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state); | |
789 | smp_mb__after_clear_bit(); | |
790 | wake_up_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER); | |
791 | rpc_wake_up(&clp->cl_rpcwaitq); | |
792 | } | |
793 | ||
1da177e4 LT |
794 | /* |
795 | * State recovery routine | |
796 | */ | |
adfa6f98 | 797 | static void nfs4_recover_state(struct nfs_client *clp) |
1da177e4 | 798 | { |
5043e900 | 799 | struct task_struct *task; |
1da177e4 | 800 | |
5043e900 TM |
801 | __module_get(THIS_MODULE); |
802 | atomic_inc(&clp->cl_count); | |
5d8515ca CL |
803 | task = kthread_run(reclaimer, clp, "%s-reclaim", |
804 | rpc_peeraddr2str(clp->cl_rpcclient, | |
805 | RPC_DISPLAY_ADDR)); | |
5043e900 TM |
806 | if (!IS_ERR(task)) |
807 | return; | |
433fbe4c | 808 | nfs4_clear_recover_bit(clp); |
24c8dbbb | 809 | nfs_put_client(clp); |
5043e900 | 810 | module_put(THIS_MODULE); |
1da177e4 LT |
811 | } |
812 | ||
813 | /* | |
814 | * Schedule a state recovery attempt | |
815 | */ | |
adfa6f98 | 816 | void nfs4_schedule_state_recovery(struct nfs_client *clp) |
1da177e4 LT |
817 | { |
818 | if (!clp) | |
819 | return; | |
433fbe4c | 820 | if (test_and_set_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0) |
5043e900 | 821 | nfs4_recover_state(clp); |
1da177e4 LT |
822 | } |
823 | ||
b79a4a1b TM |
824 | static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state) |
825 | { | |
826 | ||
827 | set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); | |
828 | /* Don't recover state that expired before the reboot */ | |
829 | if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) { | |
830 | clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); | |
831 | return 0; | |
832 | } | |
833 | set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state); | |
834 | return 1; | |
835 | } | |
836 | ||
837 | static int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state) | |
838 | { | |
839 | set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags); | |
840 | clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); | |
841 | set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state); | |
842 | return 1; | |
843 | } | |
844 | ||
02860014 | 845 | static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops) |
1da177e4 LT |
846 | { |
847 | struct inode *inode = state->inode; | |
848 | struct file_lock *fl; | |
849 | int status = 0; | |
850 | ||
90dc7d27 | 851 | for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) { |
43b2a33a | 852 | if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK))) |
1da177e4 | 853 | continue; |
cd3758e3 | 854 | if (nfs_file_open_context(fl->fl_file)->state != state) |
1da177e4 LT |
855 | continue; |
856 | status = ops->recover_lock(state, fl); | |
857 | if (status >= 0) | |
858 | continue; | |
859 | switch (status) { | |
860 | default: | |
861 | printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n", | |
3110ff80 | 862 | __func__, status); |
1da177e4 LT |
863 | case -NFS4ERR_EXPIRED: |
864 | case -NFS4ERR_NO_GRACE: | |
865 | case -NFS4ERR_RECLAIM_BAD: | |
866 | case -NFS4ERR_RECLAIM_CONFLICT: | |
43b2a33a | 867 | /* kill_proc(fl->fl_pid, SIGLOST, 1); */ |
1da177e4 LT |
868 | break; |
869 | case -NFS4ERR_STALE_CLIENTID: | |
870 | goto out_err; | |
871 | } | |
872 | } | |
873 | return 0; | |
874 | out_err: | |
875 | return status; | |
876 | } | |
877 | ||
02860014 | 878 | static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops) |
1da177e4 LT |
879 | { |
880 | struct nfs4_state *state; | |
881 | struct nfs4_lock_state *lock; | |
882 | int status = 0; | |
883 | ||
884 | /* Note: we rely on the sp->so_states list being ordered | |
885 | * so that we always reclaim open(O_RDWR) and/or open(O_WRITE) | |
886 | * states first. | |
887 | * This is needed to ensure that the server won't give us any | |
888 | * read delegations that we have to return if, say, we are | |
889 | * recovering after a network partition or a reboot from a | |
890 | * server that doesn't support a grace period. | |
891 | */ | |
892 | list_for_each_entry(state, &sp->so_states, open_states) { | |
b79a4a1b TM |
893 | if (!test_and_clear_bit(ops->state_flag_bit, &state->flags)) |
894 | continue; | |
1da177e4 LT |
895 | if (state->state == 0) |
896 | continue; | |
897 | status = ops->recover_open(sp, state); | |
1da177e4 | 898 | if (status >= 0) { |
02860014 TM |
899 | status = nfs4_reclaim_locks(state, ops); |
900 | if (status >= 0) { | |
901 | list_for_each_entry(lock, &state->lock_states, ls_locks) { | |
902 | if (!(lock->ls_flags & NFS_LOCK_INITIALIZED)) | |
903 | printk("%s: Lock reclaim failed!\n", | |
3110ff80 | 904 | __func__); |
02860014 TM |
905 | } |
906 | continue; | |
1da177e4 | 907 | } |
1da177e4 LT |
908 | } |
909 | switch (status) { | |
910 | default: | |
911 | printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n", | |
3110ff80 | 912 | __func__, status); |
1da177e4 | 913 | case -ENOENT: |
b79a4a1b | 914 | case -ESTALE: |
1da177e4 LT |
915 | /* |
916 | * Open state on this file cannot be recovered | |
917 | * All we can do is revert to using the zero stateid. | |
918 | */ | |
919 | memset(state->stateid.data, 0, | |
920 | sizeof(state->stateid.data)); | |
921 | /* Mark the file as being 'closed' */ | |
922 | state->state = 0; | |
923 | break; | |
b79a4a1b TM |
924 | case -NFS4ERR_RECLAIM_BAD: |
925 | case -NFS4ERR_RECLAIM_CONFLICT: | |
926 | nfs4_state_mark_reclaim_nograce(sp->so_client, state); | |
927 | break; | |
1da177e4 LT |
928 | case -NFS4ERR_EXPIRED: |
929 | case -NFS4ERR_NO_GRACE: | |
b79a4a1b | 930 | nfs4_state_mark_reclaim_nograce(sp->so_client, state); |
1da177e4 LT |
931 | case -NFS4ERR_STALE_CLIENTID: |
932 | goto out_err; | |
933 | } | |
934 | } | |
935 | return 0; | |
936 | out_err: | |
937 | return status; | |
938 | } | |
939 | ||
b79a4a1b TM |
940 | static void nfs4_clear_open_state(struct nfs4_state *state) |
941 | { | |
942 | struct nfs4_lock_state *lock; | |
943 | ||
944 | clear_bit(NFS_DELEGATED_STATE, &state->flags); | |
945 | clear_bit(NFS_O_RDONLY_STATE, &state->flags); | |
946 | clear_bit(NFS_O_WRONLY_STATE, &state->flags); | |
947 | clear_bit(NFS_O_RDWR_STATE, &state->flags); | |
948 | list_for_each_entry(lock, &state->lock_states, ls_locks) { | |
949 | lock->ls_seqid.counter = 0; | |
950 | lock->ls_seqid.flags = 0; | |
951 | lock->ls_flags &= ~NFS_LOCK_INITIALIZED; | |
952 | } | |
953 | } | |
954 | ||
955 | static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp, int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state)) | |
cee54fc9 TM |
956 | { |
957 | struct nfs4_state_owner *sp; | |
9f958ab8 | 958 | struct rb_node *pos; |
cee54fc9 | 959 | struct nfs4_state *state; |
cee54fc9 TM |
960 | |
961 | /* Reset all sequence ids to zero */ | |
9f958ab8 TM |
962 | for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) { |
963 | sp = rb_entry(pos, struct nfs4_state_owner, so_client_node); | |
cee54fc9 TM |
964 | sp->so_seqid.counter = 0; |
965 | sp->so_seqid.flags = 0; | |
ec073428 | 966 | spin_lock(&sp->so_lock); |
cee54fc9 | 967 | list_for_each_entry(state, &sp->so_states, open_states) { |
b79a4a1b TM |
968 | if (mark_reclaim(clp, state)) |
969 | nfs4_clear_open_state(state); | |
cee54fc9 | 970 | } |
ec073428 | 971 | spin_unlock(&sp->so_lock); |
cee54fc9 TM |
972 | } |
973 | } | |
974 | ||
b79a4a1b TM |
975 | static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp) |
976 | { | |
977 | /* Mark all delegations for reclaim */ | |
978 | nfs_delegation_mark_reclaim(clp); | |
979 | nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot); | |
980 | } | |
981 | ||
982 | static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp) | |
983 | { | |
984 | struct nfs4_state_owner *sp; | |
985 | struct rb_node *pos; | |
986 | struct nfs4_state *state; | |
987 | ||
988 | if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) | |
989 | return; | |
990 | ||
991 | for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) { | |
992 | sp = rb_entry(pos, struct nfs4_state_owner, so_client_node); | |
993 | spin_lock(&sp->so_lock); | |
994 | list_for_each_entry(state, &sp->so_states, open_states) { | |
995 | if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags)) | |
996 | continue; | |
997 | nfs4_state_mark_reclaim_nograce(clp, state); | |
998 | } | |
999 | spin_unlock(&sp->so_lock); | |
1000 | } | |
1001 | ||
1002 | nfs_delegation_reap_unclaimed(clp); | |
1003 | } | |
1004 | ||
1005 | static void nfs_delegation_clear_all(struct nfs_client *clp) | |
1006 | { | |
1007 | nfs_delegation_mark_reclaim(clp); | |
1008 | nfs_delegation_reap_unclaimed(clp); | |
1009 | } | |
1010 | ||
1011 | static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp) | |
1012 | { | |
1013 | nfs_delegation_clear_all(clp); | |
1014 | nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce); | |
1015 | } | |
1016 | ||
1017 | static void nfs4_state_end_reclaim_nograce(struct nfs_client *clp) | |
1018 | { | |
1019 | clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state); | |
1020 | } | |
1021 | ||
02860014 | 1022 | static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops) |
1da177e4 | 1023 | { |
9f958ab8 | 1024 | struct rb_node *pos; |
1da177e4 LT |
1025 | int status = 0; |
1026 | ||
02860014 TM |
1027 | /* Note: list is protected by exclusive lock on cl->cl_sem */ |
1028 | for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) { | |
1029 | struct nfs4_state_owner *sp = rb_entry(pos, struct nfs4_state_owner, so_client_node); | |
1030 | status = nfs4_reclaim_open_state(sp, ops); | |
1031 | if (status < 0) | |
1032 | break; | |
1033 | } | |
1034 | return status; | |
1035 | } | |
1036 | ||
1037 | static int nfs4_check_lease(struct nfs_client *clp) | |
1038 | { | |
1039 | struct rpc_cred *cred; | |
1040 | int status = -NFS4ERR_EXPIRED; | |
1da177e4 | 1041 | |
286d7d6a TM |
1042 | /* Are there any open files on this volume? */ |
1043 | cred = nfs4_get_renew_cred(clp); | |
1044 | if (cred != NULL) { | |
1045 | /* Yes there are: try to renew the old lease */ | |
1046 | status = nfs4_proc_renew(clp, cred); | |
a2b2bb88 | 1047 | put_rpccred(cred); |
b79a4a1b TM |
1048 | switch (status) { |
1049 | case -NFS4ERR_CB_PATH_DOWN: | |
1050 | set_bit(NFS4CLNT_CB_PATH_DOWN, &clp->cl_state); | |
1051 | break; | |
1052 | case -NFS4ERR_STALE_CLIENTID: | |
1053 | case -NFS4ERR_LEASE_MOVED: | |
1054 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1055 | nfs4_state_start_reclaim_reboot(clp); | |
1056 | break; | |
1057 | case -NFS4ERR_EXPIRED: | |
1058 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1059 | nfs4_state_start_reclaim_nograce(clp); | |
1060 | } | |
02860014 | 1061 | return status; |
286d7d6a | 1062 | } |
02860014 TM |
1063 | |
1064 | /* "reboot" to ensure we clear all state on the server */ | |
1065 | clp->cl_boot_time = CURRENT_TIME; | |
b79a4a1b | 1066 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); |
02860014 TM |
1067 | return status; |
1068 | } | |
1069 | ||
1070 | static int nfs4_reclaim_lease(struct nfs_client *clp) | |
1071 | { | |
1072 | struct rpc_cred *cred; | |
1073 | int status = -ENOENT; | |
1074 | ||
a2b2bb88 | 1075 | cred = nfs4_get_setclientid_cred(clp); |
286d7d6a TM |
1076 | if (cred != NULL) { |
1077 | status = nfs4_init_client(clp, cred); | |
1078 | put_rpccred(cred); | |
a2b2bb88 TM |
1079 | /* Handle case where the user hasn't set up machine creds */ |
1080 | if (status == -EACCES && cred == clp->cl_machine_cred) { | |
1081 | nfs4_clear_machine_cred(clp); | |
02860014 | 1082 | status = -EAGAIN; |
a2b2bb88 | 1083 | } |
286d7d6a | 1084 | } |
02860014 TM |
1085 | return status; |
1086 | } | |
1087 | ||
1088 | static int reclaimer(void *ptr) | |
1089 | { | |
1090 | struct nfs_client *clp = ptr; | |
02860014 TM |
1091 | int status = 0; |
1092 | ||
1093 | allow_signal(SIGKILL); | |
1094 | ||
1095 | /* Ensure exclusive access to NFSv4 state */ | |
1096 | down_write(&clp->cl_sem); | |
1097 | while (!list_empty(&clp->cl_superblocks)) { | |
02860014 | 1098 | status = nfs4_check_lease(clp); |
02860014 | 1099 | |
b79a4a1b TM |
1100 | if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) { |
1101 | /* We're going to have to re-establish a clientid */ | |
1102 | status = nfs4_reclaim_lease(clp); | |
1103 | if (status) { | |
1104 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1105 | if (status == -EAGAIN) | |
1106 | continue; | |
1107 | goto out_error; | |
1108 | } | |
1109 | } | |
02860014 | 1110 | |
b79a4a1b TM |
1111 | /* First recover reboot state... */ |
1112 | if (test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) { | |
1113 | /* Note: list is protected by exclusive lock on cl->cl_sem */ | |
1114 | status = nfs4_do_reclaim(clp, &nfs4_reboot_recovery_ops); | |
1115 | if (status == -NFS4ERR_STALE_CLIENTID) { | |
1116 | set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state); | |
02860014 | 1117 | continue; |
b79a4a1b TM |
1118 | } |
1119 | nfs4_state_end_reclaim_reboot(clp); | |
1120 | continue; | |
02860014 TM |
1121 | } |
1122 | ||
b79a4a1b TM |
1123 | /* Now recover expired state... */ |
1124 | if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) { | |
1125 | /* Note: list is protected by exclusive lock on cl->cl_sem */ | |
1126 | status = nfs4_do_reclaim(clp, &nfs4_nograce_recovery_ops); | |
1127 | if (status < 0) { | |
1128 | set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state); | |
1129 | if (status == -NFS4ERR_STALE_CLIENTID) | |
1130 | continue; | |
1131 | if (status == -NFS4ERR_EXPIRED) | |
1132 | continue; | |
1133 | goto out_error; | |
1134 | } else | |
1135 | nfs4_state_end_reclaim_nograce(clp); | |
1136 | continue; | |
1da177e4 | 1137 | } |
02860014 | 1138 | break; |
1da177e4 | 1139 | } |
1da177e4 | 1140 | out: |
1da177e4 | 1141 | up_write(&clp->cl_sem); |
b79a4a1b | 1142 | if (test_and_clear_bit(NFS4CLNT_CB_PATH_DOWN, &clp->cl_state)) |
1da177e4 | 1143 | nfs_handle_cb_pathdown(clp); |
433fbe4c | 1144 | nfs4_clear_recover_bit(clp); |
24c8dbbb | 1145 | nfs_put_client(clp); |
5043e900 | 1146 | module_put_and_exit(0); |
1da177e4 LT |
1147 | return 0; |
1148 | out_error: | |
5d8515ca CL |
1149 | printk(KERN_WARNING "Error: state recovery failed on NFSv4 server %s" |
1150 | " with error %d\n", clp->cl_hostname, -status); | |
b79a4a1b TM |
1151 | if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) |
1152 | nfs4_state_end_reclaim_reboot(clp); | |
1da177e4 LT |
1153 | goto out; |
1154 | } | |
1155 | ||
1156 | /* | |
1157 | * Local variables: | |
1158 | * c-basic-offset: 8 | |
1159 | * End: | |
1160 | */ |