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 | ||
1da177e4 LT |
308 | struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server, struct rpc_cred *cred) |
309 | { | |
7539bbab | 310 | struct nfs_client *clp = server->nfs_client; |
1da177e4 LT |
311 | struct nfs4_state_owner *sp, *new; |
312 | ||
1da177e4 | 313 | spin_lock(&clp->cl_lock); |
6f2e64d3 | 314 | sp = nfs4_find_state_owner(server, cred); |
1da177e4 | 315 | spin_unlock(&clp->cl_lock); |
1da177e4 LT |
316 | if (sp != NULL) |
317 | return sp; | |
9f958ab8 TM |
318 | new = nfs4_alloc_state_owner(); |
319 | if (new == NULL) | |
320 | return NULL; | |
321 | new->so_client = clp; | |
6f2e64d3 | 322 | new->so_server = server; |
9f958ab8 TM |
323 | new->so_cred = cred; |
324 | spin_lock(&clp->cl_lock); | |
325 | sp = nfs4_insert_state_owner(clp, new); | |
326 | spin_unlock(&clp->cl_lock); | |
327 | if (sp == new) | |
328 | get_rpccred(cred); | |
f6a1cc89 TM |
329 | else { |
330 | rpc_destroy_wait_queue(&new->so_sequence.wait); | |
9f958ab8 | 331 | kfree(new); |
f6a1cc89 | 332 | } |
9f958ab8 | 333 | return sp; |
1da177e4 LT |
334 | } |
335 | ||
1da177e4 LT |
336 | void nfs4_put_state_owner(struct nfs4_state_owner *sp) |
337 | { | |
adfa6f98 | 338 | struct nfs_client *clp = sp->so_client; |
1da177e4 LT |
339 | struct rpc_cred *cred = sp->so_cred; |
340 | ||
341 | if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock)) | |
342 | return; | |
9f958ab8 | 343 | nfs4_remove_state_owner(clp, sp); |
1da177e4 | 344 | spin_unlock(&clp->cl_lock); |
f6a1cc89 | 345 | rpc_destroy_wait_queue(&sp->so_sequence.wait); |
1da177e4 LT |
346 | put_rpccred(cred); |
347 | kfree(sp); | |
348 | } | |
349 | ||
350 | static struct nfs4_state * | |
351 | nfs4_alloc_open_state(void) | |
352 | { | |
353 | struct nfs4_state *state; | |
354 | ||
e7616923 | 355 | state = kzalloc(sizeof(*state), GFP_KERNEL); |
1da177e4 LT |
356 | if (!state) |
357 | return NULL; | |
1da177e4 LT |
358 | atomic_set(&state->count, 1); |
359 | INIT_LIST_HEAD(&state->lock_states); | |
8d0a8a9d | 360 | spin_lock_init(&state->state_lock); |
8bda4e4c | 361 | seqlock_init(&state->seqlock); |
1da177e4 LT |
362 | return state; |
363 | } | |
364 | ||
4cecb76f TM |
365 | void |
366 | nfs4_state_set_mode_locked(struct nfs4_state *state, mode_t mode) | |
367 | { | |
368 | if (state->state == mode) | |
369 | return; | |
370 | /* NB! List reordering - see the reclaim code for why. */ | |
371 | if ((mode & FMODE_WRITE) != (state->state & FMODE_WRITE)) { | |
372 | if (mode & FMODE_WRITE) | |
373 | list_move(&state->open_states, &state->owner->so_states); | |
374 | else | |
375 | list_move_tail(&state->open_states, &state->owner->so_states); | |
376 | } | |
4cecb76f TM |
377 | state->state = mode; |
378 | } | |
379 | ||
1da177e4 LT |
380 | static struct nfs4_state * |
381 | __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner) | |
382 | { | |
383 | struct nfs_inode *nfsi = NFS_I(inode); | |
384 | struct nfs4_state *state; | |
385 | ||
386 | list_for_each_entry(state, &nfsi->open_states, inode_states) { | |
1c816efa | 387 | if (state->owner != owner) |
1da177e4 | 388 | continue; |
1c816efa | 389 | if (atomic_inc_not_zero(&state->count)) |
1da177e4 | 390 | return state; |
1da177e4 LT |
391 | } |
392 | return NULL; | |
393 | } | |
394 | ||
1da177e4 LT |
395 | static void |
396 | nfs4_free_open_state(struct nfs4_state *state) | |
397 | { | |
398 | kfree(state); | |
399 | } | |
400 | ||
401 | struct nfs4_state * | |
402 | nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner) | |
403 | { | |
404 | struct nfs4_state *state, *new; | |
405 | struct nfs_inode *nfsi = NFS_I(inode); | |
406 | ||
407 | spin_lock(&inode->i_lock); | |
408 | state = __nfs4_find_state_byowner(inode, owner); | |
409 | spin_unlock(&inode->i_lock); | |
410 | if (state) | |
411 | goto out; | |
412 | new = nfs4_alloc_open_state(); | |
ec073428 | 413 | spin_lock(&owner->so_lock); |
1da177e4 LT |
414 | spin_lock(&inode->i_lock); |
415 | state = __nfs4_find_state_byowner(inode, owner); | |
416 | if (state == NULL && new != NULL) { | |
417 | state = new; | |
1da177e4 LT |
418 | state->owner = owner; |
419 | atomic_inc(&owner->so_count); | |
420 | list_add(&state->inode_states, &nfsi->open_states); | |
421 | state->inode = igrab(inode); | |
422 | spin_unlock(&inode->i_lock); | |
ec073428 TM |
423 | /* Note: The reclaim code dictates that we add stateless |
424 | * and read-only stateids to the end of the list */ | |
425 | list_add_tail(&state->open_states, &owner->so_states); | |
426 | spin_unlock(&owner->so_lock); | |
1da177e4 LT |
427 | } else { |
428 | spin_unlock(&inode->i_lock); | |
ec073428 | 429 | spin_unlock(&owner->so_lock); |
1da177e4 LT |
430 | if (new) |
431 | nfs4_free_open_state(new); | |
432 | } | |
433 | out: | |
434 | return state; | |
435 | } | |
436 | ||
1da177e4 LT |
437 | void nfs4_put_open_state(struct nfs4_state *state) |
438 | { | |
439 | struct inode *inode = state->inode; | |
440 | struct nfs4_state_owner *owner = state->owner; | |
441 | ||
ec073428 | 442 | if (!atomic_dec_and_lock(&state->count, &owner->so_lock)) |
1da177e4 | 443 | return; |
ec073428 | 444 | spin_lock(&inode->i_lock); |
ba683031 | 445 | list_del(&state->inode_states); |
1da177e4 | 446 | list_del(&state->open_states); |
ec073428 TM |
447 | spin_unlock(&inode->i_lock); |
448 | spin_unlock(&owner->so_lock); | |
1da177e4 | 449 | iput(inode); |
1da177e4 LT |
450 | nfs4_free_open_state(state); |
451 | nfs4_put_state_owner(owner); | |
452 | } | |
453 | ||
454 | /* | |
83c9d41e | 455 | * Close the current file. |
1da177e4 | 456 | */ |
a49c3c77 | 457 | static void __nfs4_close(struct path *path, struct nfs4_state *state, mode_t mode, int wait) |
1da177e4 | 458 | { |
1da177e4 | 459 | struct nfs4_state_owner *owner = state->owner; |
003707c7 TM |
460 | int call_close = 0; |
461 | int newstate; | |
1da177e4 LT |
462 | |
463 | atomic_inc(&owner->so_count); | |
1da177e4 | 464 | /* Protect against nfs4_find_state() */ |
ec073428 | 465 | spin_lock(&owner->so_lock); |
e7616923 TM |
466 | switch (mode & (FMODE_READ | FMODE_WRITE)) { |
467 | case FMODE_READ: | |
468 | state->n_rdonly--; | |
469 | break; | |
470 | case FMODE_WRITE: | |
471 | state->n_wronly--; | |
472 | break; | |
473 | case FMODE_READ|FMODE_WRITE: | |
474 | state->n_rdwr--; | |
475 | } | |
003707c7 | 476 | newstate = FMODE_READ|FMODE_WRITE; |
e7616923 | 477 | if (state->n_rdwr == 0) { |
003707c7 | 478 | if (state->n_rdonly == 0) { |
e7616923 | 479 | newstate &= ~FMODE_READ; |
003707c7 TM |
480 | call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags); |
481 | call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); | |
482 | } | |
483 | if (state->n_wronly == 0) { | |
e7616923 | 484 | newstate &= ~FMODE_WRITE; |
003707c7 TM |
485 | call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags); |
486 | call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); | |
487 | } | |
488 | if (newstate == 0) | |
489 | clear_bit(NFS_DELEGATED_STATE, &state->flags); | |
e7616923 | 490 | } |
003707c7 | 491 | nfs4_state_set_mode_locked(state, newstate); |
ec073428 | 492 | spin_unlock(&owner->so_lock); |
4cecb76f | 493 | |
003707c7 | 494 | if (!call_close) { |
b39e625b TM |
495 | nfs4_put_open_state(state); |
496 | nfs4_put_state_owner(owner); | |
497 | } else | |
a49c3c77 TM |
498 | nfs4_do_close(path, state, wait); |
499 | } | |
500 | ||
501 | void nfs4_close_state(struct path *path, struct nfs4_state *state, mode_t mode) | |
502 | { | |
503 | __nfs4_close(path, state, mode, 0); | |
504 | } | |
505 | ||
506 | void nfs4_close_sync(struct path *path, struct nfs4_state *state, mode_t mode) | |
507 | { | |
508 | __nfs4_close(path, state, mode, 1); | |
1da177e4 LT |
509 | } |
510 | ||
511 | /* | |
512 | * Search the state->lock_states for an existing lock_owner | |
513 | * that is compatible with current->files | |
514 | */ | |
515 | static struct nfs4_lock_state * | |
516 | __nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner) | |
517 | { | |
518 | struct nfs4_lock_state *pos; | |
519 | list_for_each_entry(pos, &state->lock_states, ls_locks) { | |
520 | if (pos->ls_owner != fl_owner) | |
521 | continue; | |
522 | atomic_inc(&pos->ls_count); | |
523 | return pos; | |
524 | } | |
525 | return NULL; | |
526 | } | |
527 | ||
1da177e4 LT |
528 | /* |
529 | * Return a compatible lock_state. If no initialized lock_state structure | |
530 | * exists, return an uninitialized one. | |
531 | * | |
1da177e4 LT |
532 | */ |
533 | static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner) | |
534 | { | |
535 | struct nfs4_lock_state *lsp; | |
adfa6f98 | 536 | struct nfs_client *clp = state->owner->so_client; |
1da177e4 | 537 | |
cee54fc9 | 538 | lsp = kzalloc(sizeof(*lsp), GFP_KERNEL); |
1da177e4 LT |
539 | if (lsp == NULL) |
540 | return NULL; | |
d0dc3701 TM |
541 | rpc_init_wait_queue(&lsp->ls_sequence.wait, "lock_seqid_waitqueue"); |
542 | spin_lock_init(&lsp->ls_sequence.lock); | |
543 | INIT_LIST_HEAD(&lsp->ls_sequence.list); | |
544 | lsp->ls_seqid.sequence = &lsp->ls_sequence; | |
1da177e4 LT |
545 | atomic_set(&lsp->ls_count, 1); |
546 | lsp->ls_owner = fl_owner; | |
1da177e4 | 547 | spin_lock(&clp->cl_lock); |
9f958ab8 | 548 | nfs_alloc_unique_id(&clp->cl_lockowner_id, &lsp->ls_id, 1, 64); |
1da177e4 | 549 | spin_unlock(&clp->cl_lock); |
8d0a8a9d | 550 | INIT_LIST_HEAD(&lsp->ls_locks); |
1da177e4 LT |
551 | return lsp; |
552 | } | |
553 | ||
9f958ab8 TM |
554 | static void nfs4_free_lock_state(struct nfs4_lock_state *lsp) |
555 | { | |
556 | struct nfs_client *clp = lsp->ls_state->owner->so_client; | |
557 | ||
558 | spin_lock(&clp->cl_lock); | |
559 | nfs_free_unique_id(&clp->cl_lockowner_id, &lsp->ls_id); | |
560 | spin_unlock(&clp->cl_lock); | |
f6a1cc89 | 561 | rpc_destroy_wait_queue(&lsp->ls_sequence.wait); |
9f958ab8 TM |
562 | kfree(lsp); |
563 | } | |
564 | ||
1da177e4 LT |
565 | /* |
566 | * Return a compatible lock_state. If no initialized lock_state structure | |
567 | * exists, return an uninitialized one. | |
568 | * | |
1da177e4 | 569 | */ |
8d0a8a9d | 570 | static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner) |
1da177e4 | 571 | { |
8d0a8a9d | 572 | struct nfs4_lock_state *lsp, *new = NULL; |
1da177e4 | 573 | |
8d0a8a9d TM |
574 | for(;;) { |
575 | spin_lock(&state->state_lock); | |
576 | lsp = __nfs4_find_lock_state(state, owner); | |
577 | if (lsp != NULL) | |
578 | break; | |
579 | if (new != NULL) { | |
580 | new->ls_state = state; | |
581 | list_add(&new->ls_locks, &state->lock_states); | |
582 | set_bit(LK_STATE_IN_USE, &state->flags); | |
583 | lsp = new; | |
584 | new = NULL; | |
585 | break; | |
586 | } | |
587 | spin_unlock(&state->state_lock); | |
588 | new = nfs4_alloc_lock_state(state, owner); | |
589 | if (new == NULL) | |
590 | return NULL; | |
591 | } | |
592 | spin_unlock(&state->state_lock); | |
9f958ab8 TM |
593 | if (new != NULL) |
594 | nfs4_free_lock_state(new); | |
1da177e4 LT |
595 | return lsp; |
596 | } | |
597 | ||
598 | /* | |
8d0a8a9d TM |
599 | * Release reference to lock_state, and free it if we see that |
600 | * it is no longer in use | |
1da177e4 | 601 | */ |
faf5f49c | 602 | void nfs4_put_lock_state(struct nfs4_lock_state *lsp) |
1da177e4 | 603 | { |
8d0a8a9d | 604 | struct nfs4_state *state; |
1da177e4 | 605 | |
8d0a8a9d TM |
606 | if (lsp == NULL) |
607 | return; | |
608 | state = lsp->ls_state; | |
609 | if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock)) | |
610 | return; | |
611 | list_del(&lsp->ls_locks); | |
612 | if (list_empty(&state->lock_states)) | |
613 | clear_bit(LK_STATE_IN_USE, &state->flags); | |
614 | spin_unlock(&state->state_lock); | |
9f958ab8 | 615 | nfs4_free_lock_state(lsp); |
1da177e4 LT |
616 | } |
617 | ||
8d0a8a9d | 618 | static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src) |
1da177e4 | 619 | { |
8d0a8a9d | 620 | struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner; |
1da177e4 | 621 | |
8d0a8a9d TM |
622 | dst->fl_u.nfs4_fl.owner = lsp; |
623 | atomic_inc(&lsp->ls_count); | |
624 | } | |
1da177e4 | 625 | |
8d0a8a9d | 626 | static void nfs4_fl_release_lock(struct file_lock *fl) |
1da177e4 | 627 | { |
8d0a8a9d | 628 | nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner); |
1da177e4 LT |
629 | } |
630 | ||
8d0a8a9d TM |
631 | static struct file_lock_operations nfs4_fl_lock_ops = { |
632 | .fl_copy_lock = nfs4_fl_copy_lock, | |
633 | .fl_release_private = nfs4_fl_release_lock, | |
634 | }; | |
635 | ||
636 | int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl) | |
1da177e4 | 637 | { |
8d0a8a9d TM |
638 | struct nfs4_lock_state *lsp; |
639 | ||
640 | if (fl->fl_ops != NULL) | |
641 | return 0; | |
642 | lsp = nfs4_get_lock_state(state, fl->fl_owner); | |
643 | if (lsp == NULL) | |
644 | return -ENOMEM; | |
645 | fl->fl_u.nfs4_fl.owner = lsp; | |
646 | fl->fl_ops = &nfs4_fl_lock_ops; | |
647 | return 0; | |
1da177e4 LT |
648 | } |
649 | ||
8d0a8a9d TM |
650 | /* |
651 | * Byte-range lock aware utility to initialize the stateid of read/write | |
652 | * requests. | |
1da177e4 | 653 | */ |
8d0a8a9d | 654 | void nfs4_copy_stateid(nfs4_stateid *dst, struct nfs4_state *state, fl_owner_t fl_owner) |
1da177e4 | 655 | { |
8d0a8a9d | 656 | struct nfs4_lock_state *lsp; |
8bda4e4c | 657 | int seq; |
1da177e4 | 658 | |
8bda4e4c TM |
659 | do { |
660 | seq = read_seqbegin(&state->seqlock); | |
661 | memcpy(dst, &state->stateid, sizeof(*dst)); | |
662 | } while (read_seqretry(&state->seqlock, seq)); | |
8d0a8a9d TM |
663 | if (test_bit(LK_STATE_IN_USE, &state->flags) == 0) |
664 | return; | |
1da177e4 | 665 | |
8d0a8a9d TM |
666 | spin_lock(&state->state_lock); |
667 | lsp = __nfs4_find_lock_state(state, fl_owner); | |
668 | if (lsp != NULL && (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0) | |
669 | memcpy(dst, &lsp->ls_stateid, sizeof(*dst)); | |
670 | spin_unlock(&state->state_lock); | |
1da177e4 LT |
671 | nfs4_put_lock_state(lsp); |
672 | } | |
673 | ||
cee54fc9 TM |
674 | struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter) |
675 | { | |
cee54fc9 TM |
676 | struct nfs_seqid *new; |
677 | ||
678 | new = kmalloc(sizeof(*new), GFP_KERNEL); | |
679 | if (new != NULL) { | |
680 | new->sequence = counter; | |
2f74c0a0 | 681 | INIT_LIST_HEAD(&new->list); |
cee54fc9 TM |
682 | } |
683 | return new; | |
684 | } | |
685 | ||
686 | void nfs_free_seqid(struct nfs_seqid *seqid) | |
1da177e4 | 687 | { |
2f74c0a0 TM |
688 | if (!list_empty(&seqid->list)) { |
689 | struct rpc_sequence *sequence = seqid->sequence->sequence; | |
cee54fc9 | 690 | |
2f74c0a0 TM |
691 | spin_lock(&sequence->lock); |
692 | list_del(&seqid->list); | |
693 | spin_unlock(&sequence->lock); | |
694 | rpc_wake_up(&sequence->wait); | |
695 | } | |
cee54fc9 | 696 | kfree(seqid); |
1da177e4 LT |
697 | } |
698 | ||
699 | /* | |
cee54fc9 TM |
700 | * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or |
701 | * failed with a seqid incrementing error - | |
702 | * see comments nfs_fs.h:seqid_mutating_error() | |
703 | */ | |
88d90939 | 704 | static void nfs_increment_seqid(int status, struct nfs_seqid *seqid) |
cee54fc9 | 705 | { |
2f74c0a0 | 706 | BUG_ON(list_first_entry(&seqid->sequence->sequence->list, struct nfs_seqid, list) != seqid); |
cee54fc9 TM |
707 | switch (status) { |
708 | case 0: | |
709 | break; | |
710 | case -NFS4ERR_BAD_SEQID: | |
6f43ddcc TM |
711 | if (seqid->sequence->flags & NFS_SEQID_CONFIRMED) |
712 | return; | |
713 | printk(KERN_WARNING "NFS: v4 server returned a bad" | |
497799e7 DM |
714 | " sequence-id error on an" |
715 | " unconfirmed sequence %p!\n", | |
6f43ddcc | 716 | seqid->sequence); |
cee54fc9 TM |
717 | case -NFS4ERR_STALE_CLIENTID: |
718 | case -NFS4ERR_STALE_STATEID: | |
719 | case -NFS4ERR_BAD_STATEID: | |
720 | case -NFS4ERR_BADXDR: | |
721 | case -NFS4ERR_RESOURCE: | |
722 | case -NFS4ERR_NOFILEHANDLE: | |
723 | /* Non-seqid mutating errors */ | |
724 | return; | |
725 | }; | |
726 | /* | |
727 | * Note: no locking needed as we are guaranteed to be first | |
728 | * on the sequence list | |
729 | */ | |
730 | seqid->sequence->counter++; | |
731 | } | |
732 | ||
733 | void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid) | |
734 | { | |
735 | if (status == -NFS4ERR_BAD_SEQID) { | |
736 | struct nfs4_state_owner *sp = container_of(seqid->sequence, | |
737 | struct nfs4_state_owner, so_seqid); | |
1da177e4 | 738 | nfs4_drop_state_owner(sp); |
cee54fc9 | 739 | } |
88d90939 | 740 | nfs_increment_seqid(status, seqid); |
cee54fc9 TM |
741 | } |
742 | ||
743 | /* | |
cee54fc9 TM |
744 | * Increment the seqid if the LOCK/LOCKU succeeded, or |
745 | * failed with a seqid incrementing error - | |
746 | * see comments nfs_fs.h:seqid_mutating_error() | |
747 | */ | |
748 | void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid) | |
749 | { | |
88d90939 | 750 | nfs_increment_seqid(status, seqid); |
cee54fc9 TM |
751 | } |
752 | ||
753 | int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task) | |
754 | { | |
755 | struct rpc_sequence *sequence = seqid->sequence->sequence; | |
756 | int status = 0; | |
757 | ||
758 | spin_lock(&sequence->lock); | |
2f74c0a0 TM |
759 | if (list_empty(&seqid->list)) |
760 | list_add_tail(&seqid->list, &sequence->list); | |
761 | if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid) | |
762 | goto unlock; | |
5d00837b | 763 | rpc_sleep_on(&sequence->wait, task, NULL); |
2f74c0a0 TM |
764 | status = -EAGAIN; |
765 | unlock: | |
cee54fc9 TM |
766 | spin_unlock(&sequence->lock); |
767 | return status; | |
1da177e4 LT |
768 | } |
769 | ||
770 | static int reclaimer(void *); | |
1da177e4 | 771 | |
adfa6f98 | 772 | static inline void nfs4_clear_recover_bit(struct nfs_client *clp) |
433fbe4c TM |
773 | { |
774 | smp_mb__before_clear_bit(); | |
775 | clear_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state); | |
776 | smp_mb__after_clear_bit(); | |
777 | wake_up_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER); | |
778 | rpc_wake_up(&clp->cl_rpcwaitq); | |
779 | } | |
780 | ||
1da177e4 LT |
781 | /* |
782 | * State recovery routine | |
783 | */ | |
adfa6f98 | 784 | static void nfs4_recover_state(struct nfs_client *clp) |
1da177e4 | 785 | { |
5043e900 | 786 | struct task_struct *task; |
1da177e4 | 787 | |
5043e900 TM |
788 | __module_get(THIS_MODULE); |
789 | atomic_inc(&clp->cl_count); | |
5d8515ca CL |
790 | task = kthread_run(reclaimer, clp, "%s-reclaim", |
791 | rpc_peeraddr2str(clp->cl_rpcclient, | |
792 | RPC_DISPLAY_ADDR)); | |
5043e900 TM |
793 | if (!IS_ERR(task)) |
794 | return; | |
433fbe4c | 795 | nfs4_clear_recover_bit(clp); |
24c8dbbb | 796 | nfs_put_client(clp); |
5043e900 | 797 | module_put(THIS_MODULE); |
1da177e4 LT |
798 | } |
799 | ||
800 | /* | |
801 | * Schedule a state recovery attempt | |
802 | */ | |
adfa6f98 | 803 | void nfs4_schedule_state_recovery(struct nfs_client *clp) |
1da177e4 LT |
804 | { |
805 | if (!clp) | |
806 | return; | |
e598d843 TM |
807 | if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) |
808 | set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); | |
433fbe4c | 809 | if (test_and_set_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0) |
5043e900 | 810 | nfs4_recover_state(clp); |
1da177e4 LT |
811 | } |
812 | ||
b79a4a1b TM |
813 | static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state) |
814 | { | |
815 | ||
816 | set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); | |
817 | /* Don't recover state that expired before the reboot */ | |
818 | if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) { | |
819 | clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); | |
820 | return 0; | |
821 | } | |
7eff03ae | 822 | set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags); |
b79a4a1b TM |
823 | set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state); |
824 | return 1; | |
825 | } | |
826 | ||
827 | static int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state) | |
828 | { | |
829 | set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags); | |
830 | clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); | |
7eff03ae | 831 | set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags); |
b79a4a1b TM |
832 | set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state); |
833 | return 1; | |
834 | } | |
835 | ||
02860014 | 836 | static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops) |
1da177e4 LT |
837 | { |
838 | struct inode *inode = state->inode; | |
19e03c57 | 839 | struct nfs_inode *nfsi = NFS_I(inode); |
1da177e4 LT |
840 | struct file_lock *fl; |
841 | int status = 0; | |
842 | ||
19e03c57 | 843 | down_write(&nfsi->rwsem); |
90dc7d27 | 844 | for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) { |
43b2a33a | 845 | if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK))) |
1da177e4 | 846 | continue; |
cd3758e3 | 847 | if (nfs_file_open_context(fl->fl_file)->state != state) |
1da177e4 LT |
848 | continue; |
849 | status = ops->recover_lock(state, fl); | |
850 | if (status >= 0) | |
851 | continue; | |
852 | switch (status) { | |
853 | default: | |
854 | printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n", | |
3110ff80 | 855 | __func__, status); |
1da177e4 LT |
856 | case -NFS4ERR_EXPIRED: |
857 | case -NFS4ERR_NO_GRACE: | |
858 | case -NFS4ERR_RECLAIM_BAD: | |
859 | case -NFS4ERR_RECLAIM_CONFLICT: | |
43b2a33a | 860 | /* kill_proc(fl->fl_pid, SIGLOST, 1); */ |
1da177e4 LT |
861 | break; |
862 | case -NFS4ERR_STALE_CLIENTID: | |
863 | goto out_err; | |
864 | } | |
865 | } | |
19e03c57 | 866 | up_write(&nfsi->rwsem); |
1da177e4 LT |
867 | return 0; |
868 | out_err: | |
19e03c57 | 869 | up_write(&nfsi->rwsem); |
1da177e4 LT |
870 | return status; |
871 | } | |
872 | ||
02860014 | 873 | static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops) |
1da177e4 LT |
874 | { |
875 | struct nfs4_state *state; | |
876 | struct nfs4_lock_state *lock; | |
877 | int status = 0; | |
878 | ||
879 | /* Note: we rely on the sp->so_states list being ordered | |
880 | * so that we always reclaim open(O_RDWR) and/or open(O_WRITE) | |
881 | * states first. | |
882 | * This is needed to ensure that the server won't give us any | |
883 | * read delegations that we have to return if, say, we are | |
884 | * recovering after a network partition or a reboot from a | |
885 | * server that doesn't support a grace period. | |
886 | */ | |
fe1d8195 TM |
887 | restart: |
888 | spin_lock(&sp->so_lock); | |
1da177e4 | 889 | list_for_each_entry(state, &sp->so_states, open_states) { |
b79a4a1b TM |
890 | if (!test_and_clear_bit(ops->state_flag_bit, &state->flags)) |
891 | continue; | |
1da177e4 LT |
892 | if (state->state == 0) |
893 | continue; | |
fe1d8195 TM |
894 | atomic_inc(&state->count); |
895 | spin_unlock(&sp->so_lock); | |
1da177e4 | 896 | status = ops->recover_open(sp, state); |
1da177e4 | 897 | if (status >= 0) { |
02860014 TM |
898 | status = nfs4_reclaim_locks(state, ops); |
899 | if (status >= 0) { | |
900 | list_for_each_entry(lock, &state->lock_states, ls_locks) { | |
901 | if (!(lock->ls_flags & NFS_LOCK_INITIALIZED)) | |
902 | printk("%s: Lock reclaim failed!\n", | |
3110ff80 | 903 | __func__); |
02860014 | 904 | } |
fe1d8195 TM |
905 | nfs4_put_open_state(state); |
906 | goto restart; | |
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 | } | |
fe1d8195 TM |
934 | nfs4_put_open_state(state); |
935 | goto restart; | |
1da177e4 | 936 | } |
fe1d8195 | 937 | spin_unlock(&sp->so_lock); |
1da177e4 LT |
938 | return 0; |
939 | out_err: | |
fe1d8195 | 940 | nfs4_put_open_state(state); |
1da177e4 LT |
941 | return status; |
942 | } | |
943 | ||
b79a4a1b TM |
944 | static void nfs4_clear_open_state(struct nfs4_state *state) |
945 | { | |
946 | struct nfs4_lock_state *lock; | |
947 | ||
948 | clear_bit(NFS_DELEGATED_STATE, &state->flags); | |
949 | clear_bit(NFS_O_RDONLY_STATE, &state->flags); | |
950 | clear_bit(NFS_O_WRONLY_STATE, &state->flags); | |
951 | clear_bit(NFS_O_RDWR_STATE, &state->flags); | |
952 | list_for_each_entry(lock, &state->lock_states, ls_locks) { | |
953 | lock->ls_seqid.counter = 0; | |
954 | lock->ls_seqid.flags = 0; | |
955 | lock->ls_flags &= ~NFS_LOCK_INITIALIZED; | |
956 | } | |
957 | } | |
958 | ||
959 | static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp, int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state)) | |
cee54fc9 TM |
960 | { |
961 | struct nfs4_state_owner *sp; | |
9f958ab8 | 962 | struct rb_node *pos; |
cee54fc9 | 963 | struct nfs4_state *state; |
cee54fc9 TM |
964 | |
965 | /* Reset all sequence ids to zero */ | |
9f958ab8 TM |
966 | for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) { |
967 | sp = rb_entry(pos, struct nfs4_state_owner, so_client_node); | |
cee54fc9 TM |
968 | sp->so_seqid.counter = 0; |
969 | sp->so_seqid.flags = 0; | |
ec073428 | 970 | spin_lock(&sp->so_lock); |
cee54fc9 | 971 | list_for_each_entry(state, &sp->so_states, open_states) { |
b79a4a1b TM |
972 | if (mark_reclaim(clp, state)) |
973 | nfs4_clear_open_state(state); | |
cee54fc9 | 974 | } |
ec073428 | 975 | spin_unlock(&sp->so_lock); |
cee54fc9 TM |
976 | } |
977 | } | |
978 | ||
b79a4a1b TM |
979 | static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp) |
980 | { | |
981 | /* Mark all delegations for reclaim */ | |
982 | nfs_delegation_mark_reclaim(clp); | |
983 | nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot); | |
984 | } | |
985 | ||
986 | static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp) | |
987 | { | |
988 | struct nfs4_state_owner *sp; | |
989 | struct rb_node *pos; | |
990 | struct nfs4_state *state; | |
991 | ||
992 | if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) | |
993 | return; | |
994 | ||
995 | for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) { | |
996 | sp = rb_entry(pos, struct nfs4_state_owner, so_client_node); | |
997 | spin_lock(&sp->so_lock); | |
998 | list_for_each_entry(state, &sp->so_states, open_states) { | |
999 | if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags)) | |
1000 | continue; | |
1001 | nfs4_state_mark_reclaim_nograce(clp, state); | |
1002 | } | |
1003 | spin_unlock(&sp->so_lock); | |
1004 | } | |
1005 | ||
1006 | nfs_delegation_reap_unclaimed(clp); | |
1007 | } | |
1008 | ||
1009 | static void nfs_delegation_clear_all(struct nfs_client *clp) | |
1010 | { | |
1011 | nfs_delegation_mark_reclaim(clp); | |
1012 | nfs_delegation_reap_unclaimed(clp); | |
1013 | } | |
1014 | ||
1015 | static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp) | |
1016 | { | |
1017 | nfs_delegation_clear_all(clp); | |
1018 | nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce); | |
1019 | } | |
1020 | ||
1021 | static void nfs4_state_end_reclaim_nograce(struct nfs_client *clp) | |
1022 | { | |
1023 | clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state); | |
1024 | } | |
1025 | ||
e598d843 TM |
1026 | static void nfs4_recovery_handle_error(struct nfs_client *clp, int error) |
1027 | { | |
1028 | switch (error) { | |
1029 | case -NFS4ERR_CB_PATH_DOWN: | |
1030 | set_bit(NFS4CLNT_CB_PATH_DOWN, &clp->cl_state); | |
1031 | break; | |
1032 | case -NFS4ERR_STALE_CLIENTID: | |
1033 | case -NFS4ERR_LEASE_MOVED: | |
1034 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1035 | nfs4_state_start_reclaim_reboot(clp); | |
1036 | break; | |
1037 | case -NFS4ERR_EXPIRED: | |
1038 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1039 | nfs4_state_start_reclaim_nograce(clp); | |
1040 | } | |
1041 | } | |
1042 | ||
02860014 | 1043 | static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops) |
1da177e4 | 1044 | { |
9f958ab8 | 1045 | struct rb_node *pos; |
1da177e4 LT |
1046 | int status = 0; |
1047 | ||
7eff03ae TM |
1048 | restart: |
1049 | spin_lock(&clp->cl_lock); | |
02860014 TM |
1050 | for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) { |
1051 | struct nfs4_state_owner *sp = rb_entry(pos, struct nfs4_state_owner, so_client_node); | |
7eff03ae TM |
1052 | if (!test_and_clear_bit(ops->owner_flag_bit, &sp->so_flags)) |
1053 | continue; | |
1054 | atomic_inc(&sp->so_count); | |
1055 | spin_unlock(&clp->cl_lock); | |
02860014 | 1056 | status = nfs4_reclaim_open_state(sp, ops); |
7eff03ae TM |
1057 | if (status < 0) { |
1058 | set_bit(ops->owner_flag_bit, &sp->so_flags); | |
1059 | nfs4_put_state_owner(sp); | |
1060 | nfs4_recovery_handle_error(clp, status); | |
1061 | return status; | |
1062 | } | |
1063 | nfs4_put_state_owner(sp); | |
1064 | goto restart; | |
02860014 | 1065 | } |
7eff03ae | 1066 | spin_unlock(&clp->cl_lock); |
02860014 TM |
1067 | return status; |
1068 | } | |
1069 | ||
1070 | static int nfs4_check_lease(struct nfs_client *clp) | |
1071 | { | |
1072 | struct rpc_cred *cred; | |
1073 | int status = -NFS4ERR_EXPIRED; | |
1da177e4 | 1074 | |
0f605b56 TM |
1075 | /* Is the client already known to have an expired lease? */ |
1076 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) | |
1077 | return 0; | |
286d7d6a | 1078 | cred = nfs4_get_renew_cred(clp); |
0f605b56 TM |
1079 | if (cred == NULL) { |
1080 | cred = nfs4_get_setclientid_cred(clp); | |
1081 | if (cred == NULL) | |
1082 | goto out; | |
286d7d6a | 1083 | } |
0f605b56 TM |
1084 | status = nfs4_proc_renew(clp, cred); |
1085 | put_rpccred(cred); | |
1086 | out: | |
1087 | nfs4_recovery_handle_error(clp, status); | |
02860014 TM |
1088 | return status; |
1089 | } | |
1090 | ||
1091 | static int nfs4_reclaim_lease(struct nfs_client *clp) | |
1092 | { | |
1093 | struct rpc_cred *cred; | |
1094 | int status = -ENOENT; | |
1095 | ||
a2b2bb88 | 1096 | cred = nfs4_get_setclientid_cred(clp); |
286d7d6a TM |
1097 | if (cred != NULL) { |
1098 | status = nfs4_init_client(clp, cred); | |
1099 | put_rpccred(cred); | |
a2b2bb88 TM |
1100 | /* Handle case where the user hasn't set up machine creds */ |
1101 | if (status == -EACCES && cred == clp->cl_machine_cred) { | |
1102 | nfs4_clear_machine_cred(clp); | |
02860014 | 1103 | status = -EAGAIN; |
a2b2bb88 | 1104 | } |
286d7d6a | 1105 | } |
02860014 TM |
1106 | return status; |
1107 | } | |
1108 | ||
1109 | static int reclaimer(void *ptr) | |
1110 | { | |
1111 | struct nfs_client *clp = ptr; | |
02860014 TM |
1112 | int status = 0; |
1113 | ||
1114 | allow_signal(SIGKILL); | |
1115 | ||
1116 | /* Ensure exclusive access to NFSv4 state */ | |
02860014 | 1117 | while (!list_empty(&clp->cl_superblocks)) { |
b79a4a1b TM |
1118 | if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) { |
1119 | /* We're going to have to re-establish a clientid */ | |
1120 | status = nfs4_reclaim_lease(clp); | |
1121 | if (status) { | |
1122 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1123 | if (status == -EAGAIN) | |
1124 | continue; | |
1125 | goto out_error; | |
1126 | } | |
e598d843 TM |
1127 | clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); |
1128 | } | |
1129 | ||
1130 | if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) { | |
1131 | status = nfs4_check_lease(clp); | |
1132 | if (status != 0) | |
1133 | continue; | |
b79a4a1b | 1134 | } |
02860014 | 1135 | |
b79a4a1b TM |
1136 | /* First recover reboot state... */ |
1137 | if (test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) { | |
b79a4a1b | 1138 | status = nfs4_do_reclaim(clp, &nfs4_reboot_recovery_ops); |
e598d843 | 1139 | if (status == -NFS4ERR_STALE_CLIENTID) |
02860014 | 1140 | continue; |
b79a4a1b TM |
1141 | nfs4_state_end_reclaim_reboot(clp); |
1142 | continue; | |
02860014 TM |
1143 | } |
1144 | ||
b79a4a1b TM |
1145 | /* Now recover expired state... */ |
1146 | if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) { | |
b79a4a1b TM |
1147 | status = nfs4_do_reclaim(clp, &nfs4_nograce_recovery_ops); |
1148 | if (status < 0) { | |
1149 | set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state); | |
1150 | if (status == -NFS4ERR_STALE_CLIENTID) | |
1151 | continue; | |
1152 | if (status == -NFS4ERR_EXPIRED) | |
1153 | continue; | |
1154 | goto out_error; | |
1155 | } else | |
1156 | nfs4_state_end_reclaim_nograce(clp); | |
1157 | continue; | |
1da177e4 | 1158 | } |
02860014 | 1159 | break; |
1da177e4 | 1160 | } |
1da177e4 | 1161 | out: |
b79a4a1b | 1162 | if (test_and_clear_bit(NFS4CLNT_CB_PATH_DOWN, &clp->cl_state)) |
1da177e4 | 1163 | nfs_handle_cb_pathdown(clp); |
433fbe4c | 1164 | nfs4_clear_recover_bit(clp); |
24c8dbbb | 1165 | nfs_put_client(clp); |
5043e900 | 1166 | module_put_and_exit(0); |
1da177e4 LT |
1167 | return 0; |
1168 | out_error: | |
5d8515ca CL |
1169 | printk(KERN_WARNING "Error: state recovery failed on NFSv4 server %s" |
1170 | " with error %d\n", clp->cl_hostname, -status); | |
b79a4a1b TM |
1171 | if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) |
1172 | nfs4_state_end_reclaim_reboot(clp); | |
1da177e4 LT |
1173 | goto out; |
1174 | } | |
1175 | ||
1176 | /* | |
1177 | * Local variables: | |
1178 | * c-basic-offset: 8 | |
1179 | * End: | |
1180 | */ |