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 | ||
1da177e4 LT |
41 | #include <linux/slab.h> |
42 | #include <linux/smp_lock.h> | |
43 | #include <linux/nfs_fs.h> | |
44 | #include <linux/nfs_idmap.h> | |
5043e900 TM |
45 | #include <linux/kthread.h> |
46 | #include <linux/module.h> | |
1da177e4 LT |
47 | #include <linux/workqueue.h> |
48 | #include <linux/bitops.h> | |
49 | ||
4ce79717 | 50 | #include "nfs4_fs.h" |
1da177e4 LT |
51 | #include "callback.h" |
52 | #include "delegation.h" | |
24c8dbbb | 53 | #include "internal.h" |
1da177e4 LT |
54 | |
55 | #define OPENOWNER_POOL_SIZE 8 | |
56 | ||
4ce79717 | 57 | const nfs4_stateid zero_stateid; |
1da177e4 LT |
58 | |
59 | static LIST_HEAD(nfs4_clientid_list); | |
60 | ||
1da177e4 LT |
61 | void |
62 | init_nfsv4_state(struct nfs_server *server) | |
63 | { | |
7539bbab | 64 | server->nfs_client = NULL; |
1da177e4 LT |
65 | INIT_LIST_HEAD(&server->nfs4_siblings); |
66 | } | |
67 | ||
68 | void | |
69 | destroy_nfsv4_state(struct nfs_server *server) | |
70 | { | |
f99d49ad JJ |
71 | kfree(server->mnt_path); |
72 | server->mnt_path = NULL; | |
7539bbab | 73 | if (server->nfs_client) { |
24c8dbbb | 74 | nfs_put_client(server->nfs_client); |
7539bbab | 75 | server->nfs_client = NULL; |
1da177e4 LT |
76 | } |
77 | } | |
78 | ||
adfa6f98 | 79 | static int nfs4_init_client(struct nfs_client *clp, struct rpc_cred *cred) |
1da177e4 | 80 | { |
286d7d6a TM |
81 | int status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, |
82 | nfs_callback_tcpport, cred); | |
1da177e4 | 83 | if (status == 0) |
286d7d6a | 84 | status = nfs4_proc_setclientid_confirm(clp, cred); |
1da177e4 LT |
85 | if (status == 0) |
86 | nfs4_schedule_state_renewal(clp); | |
87 | return status; | |
88 | } | |
89 | ||
1da177e4 | 90 | u32 |
adfa6f98 | 91 | nfs4_alloc_lockowner_id(struct nfs_client *clp) |
1da177e4 LT |
92 | { |
93 | return clp->cl_lockowner_id ++; | |
94 | } | |
95 | ||
96 | static struct nfs4_state_owner * | |
adfa6f98 | 97 | nfs4_client_grab_unused(struct nfs_client *clp, struct rpc_cred *cred) |
1da177e4 LT |
98 | { |
99 | struct nfs4_state_owner *sp = NULL; | |
100 | ||
101 | if (!list_empty(&clp->cl_unused)) { | |
102 | sp = list_entry(clp->cl_unused.next, struct nfs4_state_owner, so_list); | |
103 | atomic_inc(&sp->so_count); | |
104 | sp->so_cred = cred; | |
105 | list_move(&sp->so_list, &clp->cl_state_owners); | |
106 | clp->cl_nunused--; | |
107 | } | |
108 | return sp; | |
109 | } | |
110 | ||
adfa6f98 | 111 | struct rpc_cred *nfs4_get_renew_cred(struct nfs_client *clp) |
b4454fe1 TM |
112 | { |
113 | struct nfs4_state_owner *sp; | |
114 | struct rpc_cred *cred = NULL; | |
115 | ||
116 | list_for_each_entry(sp, &clp->cl_state_owners, so_list) { | |
117 | if (list_empty(&sp->so_states)) | |
118 | continue; | |
119 | cred = get_rpccred(sp->so_cred); | |
120 | break; | |
121 | } | |
122 | return cred; | |
123 | } | |
124 | ||
adfa6f98 | 125 | struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp) |
286d7d6a TM |
126 | { |
127 | struct nfs4_state_owner *sp; | |
128 | ||
129 | if (!list_empty(&clp->cl_state_owners)) { | |
130 | sp = list_entry(clp->cl_state_owners.next, | |
131 | struct nfs4_state_owner, so_list); | |
132 | return get_rpccred(sp->so_cred); | |
133 | } | |
134 | return NULL; | |
135 | } | |
136 | ||
1da177e4 | 137 | static struct nfs4_state_owner * |
adfa6f98 | 138 | nfs4_find_state_owner(struct nfs_client *clp, struct rpc_cred *cred) |
1da177e4 LT |
139 | { |
140 | struct nfs4_state_owner *sp, *res = NULL; | |
141 | ||
142 | list_for_each_entry(sp, &clp->cl_state_owners, so_list) { | |
143 | if (sp->so_cred != cred) | |
144 | continue; | |
145 | atomic_inc(&sp->so_count); | |
146 | /* Move to the head of the list */ | |
147 | list_move(&sp->so_list, &clp->cl_state_owners); | |
148 | res = sp; | |
149 | break; | |
150 | } | |
151 | return res; | |
152 | } | |
153 | ||
154 | /* | |
155 | * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to | |
156 | * create a new state_owner. | |
157 | * | |
158 | */ | |
159 | static struct nfs4_state_owner * | |
160 | nfs4_alloc_state_owner(void) | |
161 | { | |
162 | struct nfs4_state_owner *sp; | |
163 | ||
cee54fc9 | 164 | sp = kzalloc(sizeof(*sp),GFP_KERNEL); |
1da177e4 LT |
165 | if (!sp) |
166 | return NULL; | |
ec073428 | 167 | spin_lock_init(&sp->so_lock); |
1da177e4 LT |
168 | INIT_LIST_HEAD(&sp->so_states); |
169 | INIT_LIST_HEAD(&sp->so_delegations); | |
cee54fc9 TM |
170 | rpc_init_wait_queue(&sp->so_sequence.wait, "Seqid_waitqueue"); |
171 | sp->so_seqid.sequence = &sp->so_sequence; | |
172 | spin_lock_init(&sp->so_sequence.lock); | |
173 | INIT_LIST_HEAD(&sp->so_sequence.list); | |
1da177e4 LT |
174 | atomic_set(&sp->so_count, 1); |
175 | return sp; | |
176 | } | |
177 | ||
178 | void | |
179 | nfs4_drop_state_owner(struct nfs4_state_owner *sp) | |
180 | { | |
adfa6f98 | 181 | struct nfs_client *clp = sp->so_client; |
1da177e4 LT |
182 | spin_lock(&clp->cl_lock); |
183 | list_del_init(&sp->so_list); | |
184 | spin_unlock(&clp->cl_lock); | |
185 | } | |
186 | ||
187 | /* | |
188 | * Note: must be called with clp->cl_sem held in order to prevent races | |
189 | * with reboot recovery! | |
190 | */ | |
191 | struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server, struct rpc_cred *cred) | |
192 | { | |
7539bbab | 193 | struct nfs_client *clp = server->nfs_client; |
1da177e4 LT |
194 | struct nfs4_state_owner *sp, *new; |
195 | ||
196 | get_rpccred(cred); | |
197 | new = nfs4_alloc_state_owner(); | |
198 | spin_lock(&clp->cl_lock); | |
199 | sp = nfs4_find_state_owner(clp, cred); | |
200 | if (sp == NULL) | |
201 | sp = nfs4_client_grab_unused(clp, cred); | |
202 | if (sp == NULL && new != NULL) { | |
203 | list_add(&new->so_list, &clp->cl_state_owners); | |
204 | new->so_client = clp; | |
205 | new->so_id = nfs4_alloc_lockowner_id(clp); | |
206 | new->so_cred = cred; | |
207 | sp = new; | |
208 | new = NULL; | |
209 | } | |
210 | spin_unlock(&clp->cl_lock); | |
f99d49ad | 211 | kfree(new); |
1da177e4 LT |
212 | if (sp != NULL) |
213 | return sp; | |
214 | put_rpccred(cred); | |
215 | return NULL; | |
216 | } | |
217 | ||
218 | /* | |
219 | * Must be called with clp->cl_sem held in order to avoid races | |
220 | * with state recovery... | |
221 | */ | |
222 | void nfs4_put_state_owner(struct nfs4_state_owner *sp) | |
223 | { | |
adfa6f98 | 224 | struct nfs_client *clp = sp->so_client; |
1da177e4 LT |
225 | struct rpc_cred *cred = sp->so_cred; |
226 | ||
227 | if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock)) | |
228 | return; | |
229 | if (clp->cl_nunused >= OPENOWNER_POOL_SIZE) | |
230 | goto out_free; | |
231 | if (list_empty(&sp->so_list)) | |
232 | goto out_free; | |
233 | list_move(&sp->so_list, &clp->cl_unused); | |
234 | clp->cl_nunused++; | |
235 | spin_unlock(&clp->cl_lock); | |
236 | put_rpccred(cred); | |
237 | cred = NULL; | |
238 | return; | |
239 | out_free: | |
240 | list_del(&sp->so_list); | |
241 | spin_unlock(&clp->cl_lock); | |
242 | put_rpccred(cred); | |
243 | kfree(sp); | |
244 | } | |
245 | ||
246 | static struct nfs4_state * | |
247 | nfs4_alloc_open_state(void) | |
248 | { | |
249 | struct nfs4_state *state; | |
250 | ||
e7616923 | 251 | state = kzalloc(sizeof(*state), GFP_KERNEL); |
1da177e4 LT |
252 | if (!state) |
253 | return NULL; | |
1da177e4 LT |
254 | atomic_set(&state->count, 1); |
255 | INIT_LIST_HEAD(&state->lock_states); | |
8d0a8a9d | 256 | spin_lock_init(&state->state_lock); |
1da177e4 LT |
257 | return state; |
258 | } | |
259 | ||
4cecb76f TM |
260 | void |
261 | nfs4_state_set_mode_locked(struct nfs4_state *state, mode_t mode) | |
262 | { | |
263 | if (state->state == mode) | |
264 | return; | |
265 | /* NB! List reordering - see the reclaim code for why. */ | |
266 | if ((mode & FMODE_WRITE) != (state->state & FMODE_WRITE)) { | |
267 | if (mode & FMODE_WRITE) | |
268 | list_move(&state->open_states, &state->owner->so_states); | |
269 | else | |
270 | list_move_tail(&state->open_states, &state->owner->so_states); | |
271 | } | |
272 | if (mode == 0) | |
273 | list_del_init(&state->inode_states); | |
274 | state->state = mode; | |
275 | } | |
276 | ||
1da177e4 LT |
277 | static struct nfs4_state * |
278 | __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner) | |
279 | { | |
280 | struct nfs_inode *nfsi = NFS_I(inode); | |
281 | struct nfs4_state *state; | |
282 | ||
283 | list_for_each_entry(state, &nfsi->open_states, inode_states) { | |
284 | /* Is this in the process of being freed? */ | |
4cecb76f | 285 | if (state->state == 0) |
1da177e4 LT |
286 | continue; |
287 | if (state->owner == owner) { | |
288 | atomic_inc(&state->count); | |
289 | return state; | |
290 | } | |
291 | } | |
292 | return NULL; | |
293 | } | |
294 | ||
1da177e4 LT |
295 | static void |
296 | nfs4_free_open_state(struct nfs4_state *state) | |
297 | { | |
298 | kfree(state); | |
299 | } | |
300 | ||
301 | struct nfs4_state * | |
302 | nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner) | |
303 | { | |
304 | struct nfs4_state *state, *new; | |
305 | struct nfs_inode *nfsi = NFS_I(inode); | |
306 | ||
307 | spin_lock(&inode->i_lock); | |
308 | state = __nfs4_find_state_byowner(inode, owner); | |
309 | spin_unlock(&inode->i_lock); | |
310 | if (state) | |
311 | goto out; | |
312 | new = nfs4_alloc_open_state(); | |
ec073428 | 313 | spin_lock(&owner->so_lock); |
1da177e4 LT |
314 | spin_lock(&inode->i_lock); |
315 | state = __nfs4_find_state_byowner(inode, owner); | |
316 | if (state == NULL && new != NULL) { | |
317 | state = new; | |
1da177e4 LT |
318 | state->owner = owner; |
319 | atomic_inc(&owner->so_count); | |
320 | list_add(&state->inode_states, &nfsi->open_states); | |
321 | state->inode = igrab(inode); | |
322 | spin_unlock(&inode->i_lock); | |
ec073428 TM |
323 | /* Note: The reclaim code dictates that we add stateless |
324 | * and read-only stateids to the end of the list */ | |
325 | list_add_tail(&state->open_states, &owner->so_states); | |
326 | spin_unlock(&owner->so_lock); | |
1da177e4 LT |
327 | } else { |
328 | spin_unlock(&inode->i_lock); | |
ec073428 | 329 | spin_unlock(&owner->so_lock); |
1da177e4 LT |
330 | if (new) |
331 | nfs4_free_open_state(new); | |
332 | } | |
333 | out: | |
334 | return state; | |
335 | } | |
336 | ||
337 | /* | |
338 | * Beware! Caller must be holding exactly one | |
e6dfa553 | 339 | * reference to clp->cl_sem! |
1da177e4 LT |
340 | */ |
341 | void nfs4_put_open_state(struct nfs4_state *state) | |
342 | { | |
343 | struct inode *inode = state->inode; | |
344 | struct nfs4_state_owner *owner = state->owner; | |
345 | ||
ec073428 | 346 | if (!atomic_dec_and_lock(&state->count, &owner->so_lock)) |
1da177e4 | 347 | return; |
ec073428 | 348 | spin_lock(&inode->i_lock); |
1da177e4 LT |
349 | if (!list_empty(&state->inode_states)) |
350 | list_del(&state->inode_states); | |
1da177e4 | 351 | list_del(&state->open_states); |
ec073428 TM |
352 | spin_unlock(&inode->i_lock); |
353 | spin_unlock(&owner->so_lock); | |
1da177e4 | 354 | iput(inode); |
1da177e4 LT |
355 | nfs4_free_open_state(state); |
356 | nfs4_put_state_owner(owner); | |
357 | } | |
358 | ||
359 | /* | |
83c9d41e | 360 | * Close the current file. |
1da177e4 LT |
361 | */ |
362 | void nfs4_close_state(struct nfs4_state *state, mode_t mode) | |
363 | { | |
364 | struct inode *inode = state->inode; | |
365 | struct nfs4_state_owner *owner = state->owner; | |
4cecb76f | 366 | int oldstate, newstate = 0; |
1da177e4 LT |
367 | |
368 | atomic_inc(&owner->so_count); | |
1da177e4 | 369 | /* Protect against nfs4_find_state() */ |
ec073428 | 370 | spin_lock(&owner->so_lock); |
1da177e4 | 371 | spin_lock(&inode->i_lock); |
e7616923 TM |
372 | switch (mode & (FMODE_READ | FMODE_WRITE)) { |
373 | case FMODE_READ: | |
374 | state->n_rdonly--; | |
375 | break; | |
376 | case FMODE_WRITE: | |
377 | state->n_wronly--; | |
378 | break; | |
379 | case FMODE_READ|FMODE_WRITE: | |
380 | state->n_rdwr--; | |
381 | } | |
4cecb76f | 382 | oldstate = newstate = state->state; |
e7616923 TM |
383 | if (state->n_rdwr == 0) { |
384 | if (state->n_rdonly == 0) | |
385 | newstate &= ~FMODE_READ; | |
386 | if (state->n_wronly == 0) | |
387 | newstate &= ~FMODE_WRITE; | |
388 | } | |
4cecb76f TM |
389 | if (test_bit(NFS_DELEGATED_STATE, &state->flags)) { |
390 | nfs4_state_set_mode_locked(state, newstate); | |
391 | oldstate = newstate; | |
1da177e4 LT |
392 | } |
393 | spin_unlock(&inode->i_lock); | |
ec073428 | 394 | spin_unlock(&owner->so_lock); |
4cecb76f TM |
395 | |
396 | if (oldstate != newstate && nfs4_do_close(inode, state) == 0) | |
397 | return; | |
1da177e4 | 398 | nfs4_put_open_state(state); |
1da177e4 | 399 | nfs4_put_state_owner(owner); |
1da177e4 LT |
400 | } |
401 | ||
402 | /* | |
403 | * Search the state->lock_states for an existing lock_owner | |
404 | * that is compatible with current->files | |
405 | */ | |
406 | static struct nfs4_lock_state * | |
407 | __nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner) | |
408 | { | |
409 | struct nfs4_lock_state *pos; | |
410 | list_for_each_entry(pos, &state->lock_states, ls_locks) { | |
411 | if (pos->ls_owner != fl_owner) | |
412 | continue; | |
413 | atomic_inc(&pos->ls_count); | |
414 | return pos; | |
415 | } | |
416 | return NULL; | |
417 | } | |
418 | ||
1da177e4 LT |
419 | /* |
420 | * Return a compatible lock_state. If no initialized lock_state structure | |
421 | * exists, return an uninitialized one. | |
422 | * | |
1da177e4 LT |
423 | */ |
424 | static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner) | |
425 | { | |
426 | struct nfs4_lock_state *lsp; | |
adfa6f98 | 427 | struct nfs_client *clp = state->owner->so_client; |
1da177e4 | 428 | |
cee54fc9 | 429 | lsp = kzalloc(sizeof(*lsp), GFP_KERNEL); |
1da177e4 LT |
430 | if (lsp == NULL) |
431 | return NULL; | |
cee54fc9 | 432 | lsp->ls_seqid.sequence = &state->owner->so_sequence; |
1da177e4 LT |
433 | atomic_set(&lsp->ls_count, 1); |
434 | lsp->ls_owner = fl_owner; | |
1da177e4 LT |
435 | spin_lock(&clp->cl_lock); |
436 | lsp->ls_id = nfs4_alloc_lockowner_id(clp); | |
437 | spin_unlock(&clp->cl_lock); | |
8d0a8a9d | 438 | INIT_LIST_HEAD(&lsp->ls_locks); |
1da177e4 LT |
439 | return lsp; |
440 | } | |
441 | ||
442 | /* | |
443 | * Return a compatible lock_state. If no initialized lock_state structure | |
444 | * exists, return an uninitialized one. | |
445 | * | |
e6dfa553 | 446 | * The caller must be holding clp->cl_sem |
1da177e4 | 447 | */ |
8d0a8a9d | 448 | static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner) |
1da177e4 | 449 | { |
8d0a8a9d | 450 | struct nfs4_lock_state *lsp, *new = NULL; |
1da177e4 | 451 | |
8d0a8a9d TM |
452 | for(;;) { |
453 | spin_lock(&state->state_lock); | |
454 | lsp = __nfs4_find_lock_state(state, owner); | |
455 | if (lsp != NULL) | |
456 | break; | |
457 | if (new != NULL) { | |
458 | new->ls_state = state; | |
459 | list_add(&new->ls_locks, &state->lock_states); | |
460 | set_bit(LK_STATE_IN_USE, &state->flags); | |
461 | lsp = new; | |
462 | new = NULL; | |
463 | break; | |
464 | } | |
465 | spin_unlock(&state->state_lock); | |
466 | new = nfs4_alloc_lock_state(state, owner); | |
467 | if (new == NULL) | |
468 | return NULL; | |
469 | } | |
470 | spin_unlock(&state->state_lock); | |
471 | kfree(new); | |
1da177e4 LT |
472 | return lsp; |
473 | } | |
474 | ||
475 | /* | |
8d0a8a9d TM |
476 | * Release reference to lock_state, and free it if we see that |
477 | * it is no longer in use | |
1da177e4 | 478 | */ |
faf5f49c | 479 | void nfs4_put_lock_state(struct nfs4_lock_state *lsp) |
1da177e4 | 480 | { |
8d0a8a9d | 481 | struct nfs4_state *state; |
1da177e4 | 482 | |
8d0a8a9d TM |
483 | if (lsp == NULL) |
484 | return; | |
485 | state = lsp->ls_state; | |
486 | if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock)) | |
487 | return; | |
488 | list_del(&lsp->ls_locks); | |
489 | if (list_empty(&state->lock_states)) | |
490 | clear_bit(LK_STATE_IN_USE, &state->flags); | |
491 | spin_unlock(&state->state_lock); | |
492 | kfree(lsp); | |
1da177e4 LT |
493 | } |
494 | ||
8d0a8a9d | 495 | static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src) |
1da177e4 | 496 | { |
8d0a8a9d | 497 | struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner; |
1da177e4 | 498 | |
8d0a8a9d TM |
499 | dst->fl_u.nfs4_fl.owner = lsp; |
500 | atomic_inc(&lsp->ls_count); | |
501 | } | |
1da177e4 | 502 | |
8d0a8a9d | 503 | static void nfs4_fl_release_lock(struct file_lock *fl) |
1da177e4 | 504 | { |
8d0a8a9d | 505 | nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner); |
1da177e4 LT |
506 | } |
507 | ||
8d0a8a9d TM |
508 | static struct file_lock_operations nfs4_fl_lock_ops = { |
509 | .fl_copy_lock = nfs4_fl_copy_lock, | |
510 | .fl_release_private = nfs4_fl_release_lock, | |
511 | }; | |
512 | ||
513 | int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl) | |
1da177e4 | 514 | { |
8d0a8a9d TM |
515 | struct nfs4_lock_state *lsp; |
516 | ||
517 | if (fl->fl_ops != NULL) | |
518 | return 0; | |
519 | lsp = nfs4_get_lock_state(state, fl->fl_owner); | |
520 | if (lsp == NULL) | |
521 | return -ENOMEM; | |
522 | fl->fl_u.nfs4_fl.owner = lsp; | |
523 | fl->fl_ops = &nfs4_fl_lock_ops; | |
524 | return 0; | |
1da177e4 LT |
525 | } |
526 | ||
8d0a8a9d TM |
527 | /* |
528 | * Byte-range lock aware utility to initialize the stateid of read/write | |
529 | * requests. | |
1da177e4 | 530 | */ |
8d0a8a9d | 531 | void nfs4_copy_stateid(nfs4_stateid *dst, struct nfs4_state *state, fl_owner_t fl_owner) |
1da177e4 | 532 | { |
8d0a8a9d | 533 | struct nfs4_lock_state *lsp; |
1da177e4 | 534 | |
8d0a8a9d TM |
535 | memcpy(dst, &state->stateid, sizeof(*dst)); |
536 | if (test_bit(LK_STATE_IN_USE, &state->flags) == 0) | |
537 | return; | |
1da177e4 | 538 | |
8d0a8a9d TM |
539 | spin_lock(&state->state_lock); |
540 | lsp = __nfs4_find_lock_state(state, fl_owner); | |
541 | if (lsp != NULL && (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0) | |
542 | memcpy(dst, &lsp->ls_stateid, sizeof(*dst)); | |
543 | spin_unlock(&state->state_lock); | |
1da177e4 LT |
544 | nfs4_put_lock_state(lsp); |
545 | } | |
546 | ||
cee54fc9 TM |
547 | struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter) |
548 | { | |
36f20c6d | 549 | struct rpc_sequence *sequence = counter->sequence; |
cee54fc9 TM |
550 | struct nfs_seqid *new; |
551 | ||
552 | new = kmalloc(sizeof(*new), GFP_KERNEL); | |
553 | if (new != NULL) { | |
554 | new->sequence = counter; | |
36f20c6d TM |
555 | spin_lock(&sequence->lock); |
556 | list_add_tail(&new->list, &sequence->list); | |
557 | spin_unlock(&sequence->lock); | |
cee54fc9 TM |
558 | } |
559 | return new; | |
560 | } | |
561 | ||
562 | void nfs_free_seqid(struct nfs_seqid *seqid) | |
1da177e4 | 563 | { |
cee54fc9 | 564 | struct rpc_sequence *sequence = seqid->sequence->sequence; |
cee54fc9 | 565 | |
36f20c6d TM |
566 | spin_lock(&sequence->lock); |
567 | list_del(&seqid->list); | |
568 | spin_unlock(&sequence->lock); | |
569 | rpc_wake_up(&sequence->wait); | |
cee54fc9 | 570 | kfree(seqid); |
1da177e4 LT |
571 | } |
572 | ||
573 | /* | |
cee54fc9 TM |
574 | * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or |
575 | * failed with a seqid incrementing error - | |
576 | * see comments nfs_fs.h:seqid_mutating_error() | |
577 | */ | |
578 | static inline void nfs_increment_seqid(int status, struct nfs_seqid *seqid) | |
579 | { | |
580 | switch (status) { | |
581 | case 0: | |
582 | break; | |
583 | case -NFS4ERR_BAD_SEQID: | |
584 | case -NFS4ERR_STALE_CLIENTID: | |
585 | case -NFS4ERR_STALE_STATEID: | |
586 | case -NFS4ERR_BAD_STATEID: | |
587 | case -NFS4ERR_BADXDR: | |
588 | case -NFS4ERR_RESOURCE: | |
589 | case -NFS4ERR_NOFILEHANDLE: | |
590 | /* Non-seqid mutating errors */ | |
591 | return; | |
592 | }; | |
593 | /* | |
594 | * Note: no locking needed as we are guaranteed to be first | |
595 | * on the sequence list | |
596 | */ | |
597 | seqid->sequence->counter++; | |
598 | } | |
599 | ||
600 | void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid) | |
601 | { | |
602 | if (status == -NFS4ERR_BAD_SEQID) { | |
603 | struct nfs4_state_owner *sp = container_of(seqid->sequence, | |
604 | struct nfs4_state_owner, so_seqid); | |
1da177e4 | 605 | nfs4_drop_state_owner(sp); |
cee54fc9 TM |
606 | } |
607 | return nfs_increment_seqid(status, seqid); | |
608 | } | |
609 | ||
610 | /* | |
cee54fc9 TM |
611 | * Increment the seqid if the LOCK/LOCKU succeeded, or |
612 | * failed with a seqid incrementing error - | |
613 | * see comments nfs_fs.h:seqid_mutating_error() | |
614 | */ | |
615 | void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid) | |
616 | { | |
617 | return nfs_increment_seqid(status, seqid); | |
618 | } | |
619 | ||
620 | int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task) | |
621 | { | |
622 | struct rpc_sequence *sequence = seqid->sequence->sequence; | |
623 | int status = 0; | |
624 | ||
4e51336a TM |
625 | if (sequence->list.next == &seqid->list) |
626 | goto out; | |
cee54fc9 | 627 | spin_lock(&sequence->lock); |
36f20c6d | 628 | if (sequence->list.next != &seqid->list) { |
cee54fc9 TM |
629 | rpc_sleep_on(&sequence->wait, task, NULL, NULL); |
630 | status = -EAGAIN; | |
36f20c6d | 631 | } |
cee54fc9 | 632 | spin_unlock(&sequence->lock); |
4e51336a | 633 | out: |
cee54fc9 | 634 | return status; |
1da177e4 LT |
635 | } |
636 | ||
637 | static int reclaimer(void *); | |
1da177e4 | 638 | |
adfa6f98 | 639 | static inline void nfs4_clear_recover_bit(struct nfs_client *clp) |
433fbe4c TM |
640 | { |
641 | smp_mb__before_clear_bit(); | |
642 | clear_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state); | |
643 | smp_mb__after_clear_bit(); | |
644 | wake_up_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER); | |
645 | rpc_wake_up(&clp->cl_rpcwaitq); | |
646 | } | |
647 | ||
1da177e4 LT |
648 | /* |
649 | * State recovery routine | |
650 | */ | |
adfa6f98 | 651 | static void nfs4_recover_state(struct nfs_client *clp) |
1da177e4 | 652 | { |
5043e900 | 653 | struct task_struct *task; |
1da177e4 | 654 | |
5043e900 TM |
655 | __module_get(THIS_MODULE); |
656 | atomic_inc(&clp->cl_count); | |
657 | task = kthread_run(reclaimer, clp, "%u.%u.%u.%u-reclaim", | |
24c8dbbb | 658 | NIPQUAD(clp->cl_addr.sin_addr)); |
5043e900 TM |
659 | if (!IS_ERR(task)) |
660 | return; | |
433fbe4c | 661 | nfs4_clear_recover_bit(clp); |
24c8dbbb | 662 | nfs_put_client(clp); |
5043e900 | 663 | module_put(THIS_MODULE); |
1da177e4 LT |
664 | } |
665 | ||
666 | /* | |
667 | * Schedule a state recovery attempt | |
668 | */ | |
adfa6f98 | 669 | void nfs4_schedule_state_recovery(struct nfs_client *clp) |
1da177e4 LT |
670 | { |
671 | if (!clp) | |
672 | return; | |
433fbe4c | 673 | if (test_and_set_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0) |
5043e900 | 674 | nfs4_recover_state(clp); |
1da177e4 LT |
675 | } |
676 | ||
677 | static int nfs4_reclaim_locks(struct nfs4_state_recovery_ops *ops, struct nfs4_state *state) | |
678 | { | |
679 | struct inode *inode = state->inode; | |
680 | struct file_lock *fl; | |
681 | int status = 0; | |
682 | ||
683 | for (fl = inode->i_flock; fl != 0; fl = fl->fl_next) { | |
43b2a33a | 684 | if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK))) |
1da177e4 LT |
685 | continue; |
686 | if (((struct nfs_open_context *)fl->fl_file->private_data)->state != state) | |
687 | continue; | |
688 | status = ops->recover_lock(state, fl); | |
689 | if (status >= 0) | |
690 | continue; | |
691 | switch (status) { | |
692 | default: | |
693 | printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n", | |
694 | __FUNCTION__, status); | |
695 | case -NFS4ERR_EXPIRED: | |
696 | case -NFS4ERR_NO_GRACE: | |
697 | case -NFS4ERR_RECLAIM_BAD: | |
698 | case -NFS4ERR_RECLAIM_CONFLICT: | |
43b2a33a | 699 | /* kill_proc(fl->fl_pid, SIGLOST, 1); */ |
1da177e4 LT |
700 | break; |
701 | case -NFS4ERR_STALE_CLIENTID: | |
702 | goto out_err; | |
703 | } | |
704 | } | |
705 | return 0; | |
706 | out_err: | |
707 | return status; | |
708 | } | |
709 | ||
710 | static int nfs4_reclaim_open_state(struct nfs4_state_recovery_ops *ops, struct nfs4_state_owner *sp) | |
711 | { | |
712 | struct nfs4_state *state; | |
713 | struct nfs4_lock_state *lock; | |
714 | int status = 0; | |
715 | ||
716 | /* Note: we rely on the sp->so_states list being ordered | |
717 | * so that we always reclaim open(O_RDWR) and/or open(O_WRITE) | |
718 | * states first. | |
719 | * This is needed to ensure that the server won't give us any | |
720 | * read delegations that we have to return if, say, we are | |
721 | * recovering after a network partition or a reboot from a | |
722 | * server that doesn't support a grace period. | |
723 | */ | |
724 | list_for_each_entry(state, &sp->so_states, open_states) { | |
725 | if (state->state == 0) | |
726 | continue; | |
727 | status = ops->recover_open(sp, state); | |
1da177e4 LT |
728 | if (status >= 0) { |
729 | status = nfs4_reclaim_locks(ops, state); | |
730 | if (status < 0) | |
731 | goto out_err; | |
732 | list_for_each_entry(lock, &state->lock_states, ls_locks) { | |
733 | if (!(lock->ls_flags & NFS_LOCK_INITIALIZED)) | |
734 | printk("%s: Lock reclaim failed!\n", | |
735 | __FUNCTION__); | |
736 | } | |
737 | continue; | |
738 | } | |
739 | switch (status) { | |
740 | default: | |
741 | printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n", | |
742 | __FUNCTION__, status); | |
743 | case -ENOENT: | |
744 | case -NFS4ERR_RECLAIM_BAD: | |
745 | case -NFS4ERR_RECLAIM_CONFLICT: | |
746 | /* | |
747 | * Open state on this file cannot be recovered | |
748 | * All we can do is revert to using the zero stateid. | |
749 | */ | |
750 | memset(state->stateid.data, 0, | |
751 | sizeof(state->stateid.data)); | |
752 | /* Mark the file as being 'closed' */ | |
753 | state->state = 0; | |
754 | break; | |
755 | case -NFS4ERR_EXPIRED: | |
756 | case -NFS4ERR_NO_GRACE: | |
757 | case -NFS4ERR_STALE_CLIENTID: | |
758 | goto out_err; | |
759 | } | |
760 | } | |
761 | return 0; | |
762 | out_err: | |
763 | return status; | |
764 | } | |
765 | ||
adfa6f98 | 766 | static void nfs4_state_mark_reclaim(struct nfs_client *clp) |
cee54fc9 TM |
767 | { |
768 | struct nfs4_state_owner *sp; | |
769 | struct nfs4_state *state; | |
770 | struct nfs4_lock_state *lock; | |
771 | ||
772 | /* Reset all sequence ids to zero */ | |
773 | list_for_each_entry(sp, &clp->cl_state_owners, so_list) { | |
774 | sp->so_seqid.counter = 0; | |
775 | sp->so_seqid.flags = 0; | |
ec073428 | 776 | spin_lock(&sp->so_lock); |
cee54fc9 TM |
777 | list_for_each_entry(state, &sp->so_states, open_states) { |
778 | list_for_each_entry(lock, &state->lock_states, ls_locks) { | |
779 | lock->ls_seqid.counter = 0; | |
780 | lock->ls_seqid.flags = 0; | |
781 | lock->ls_flags &= ~NFS_LOCK_INITIALIZED; | |
782 | } | |
783 | } | |
ec073428 | 784 | spin_unlock(&sp->so_lock); |
cee54fc9 TM |
785 | } |
786 | } | |
787 | ||
1da177e4 LT |
788 | static int reclaimer(void *ptr) |
789 | { | |
adfa6f98 | 790 | struct nfs_client *clp = ptr; |
1da177e4 LT |
791 | struct nfs4_state_owner *sp; |
792 | struct nfs4_state_recovery_ops *ops; | |
286d7d6a | 793 | struct rpc_cred *cred; |
1da177e4 LT |
794 | int status = 0; |
795 | ||
1da177e4 LT |
796 | allow_signal(SIGKILL); |
797 | ||
1da177e4 LT |
798 | /* Ensure exclusive access to NFSv4 state */ |
799 | lock_kernel(); | |
800 | down_write(&clp->cl_sem); | |
801 | /* Are there any NFS mounts out there? */ | |
802 | if (list_empty(&clp->cl_superblocks)) | |
803 | goto out; | |
804 | restart_loop: | |
286d7d6a TM |
805 | ops = &nfs4_network_partition_recovery_ops; |
806 | /* Are there any open files on this volume? */ | |
807 | cred = nfs4_get_renew_cred(clp); | |
808 | if (cred != NULL) { | |
809 | /* Yes there are: try to renew the old lease */ | |
810 | status = nfs4_proc_renew(clp, cred); | |
811 | switch (status) { | |
812 | case 0: | |
813 | case -NFS4ERR_CB_PATH_DOWN: | |
814 | put_rpccred(cred); | |
815 | goto out; | |
816 | case -NFS4ERR_STALE_CLIENTID: | |
817 | case -NFS4ERR_LEASE_MOVED: | |
818 | ops = &nfs4_reboot_recovery_ops; | |
819 | } | |
820 | } else { | |
821 | /* "reboot" to ensure we clear all state on the server */ | |
822 | clp->cl_boot_time = CURRENT_TIME; | |
823 | cred = nfs4_get_setclientid_cred(clp); | |
824 | } | |
825 | /* We're going to have to re-establish a clientid */ | |
cee54fc9 | 826 | nfs4_state_mark_reclaim(clp); |
286d7d6a TM |
827 | status = -ENOENT; |
828 | if (cred != NULL) { | |
829 | status = nfs4_init_client(clp, cred); | |
830 | put_rpccred(cred); | |
831 | } | |
1da177e4 LT |
832 | if (status) |
833 | goto out_error; | |
834 | /* Mark all delegations for reclaim */ | |
835 | nfs_delegation_mark_reclaim(clp); | |
836 | /* Note: list is protected by exclusive lock on cl->cl_sem */ | |
837 | list_for_each_entry(sp, &clp->cl_state_owners, so_list) { | |
838 | status = nfs4_reclaim_open_state(ops, sp); | |
839 | if (status < 0) { | |
840 | if (status == -NFS4ERR_NO_GRACE) { | |
841 | ops = &nfs4_network_partition_recovery_ops; | |
842 | status = nfs4_reclaim_open_state(ops, sp); | |
843 | } | |
844 | if (status == -NFS4ERR_STALE_CLIENTID) | |
845 | goto restart_loop; | |
846 | if (status == -NFS4ERR_EXPIRED) | |
847 | goto restart_loop; | |
848 | } | |
849 | } | |
850 | nfs_delegation_reap_unclaimed(clp); | |
851 | out: | |
1da177e4 LT |
852 | up_write(&clp->cl_sem); |
853 | unlock_kernel(); | |
1da177e4 LT |
854 | if (status == -NFS4ERR_CB_PATH_DOWN) |
855 | nfs_handle_cb_pathdown(clp); | |
433fbe4c | 856 | nfs4_clear_recover_bit(clp); |
24c8dbbb | 857 | nfs_put_client(clp); |
5043e900 | 858 | module_put_and_exit(0); |
1da177e4 LT |
859 | return 0; |
860 | out_error: | |
861 | printk(KERN_WARNING "Error: state recovery failed on NFSv4 server %u.%u.%u.%u with error %d\n", | |
24c8dbbb | 862 | NIPQUAD(clp->cl_addr.sin_addr), -status); |
51581f3b | 863 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); |
1da177e4 LT |
864 | goto out; |
865 | } | |
866 | ||
867 | /* | |
868 | * Local variables: | |
869 | * c-basic-offset: 8 | |
870 | * End: | |
871 | */ |