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1 | /* | |
2 | * linux/fs/nfs/delegation.c | |
3 | * | |
4 | * Copyright (C) 2004 Trond Myklebust | |
5 | * | |
6 | * NFS file delegation management | |
7 | * | |
8 | */ | |
9 | #include <linux/completion.h> | |
10 | #include <linux/kthread.h> | |
11 | #include <linux/module.h> | |
12 | #include <linux/sched.h> | |
13 | #include <linux/slab.h> | |
14 | #include <linux/spinlock.h> | |
15 | ||
16 | #include <linux/nfs4.h> | |
17 | #include <linux/nfs_fs.h> | |
18 | #include <linux/nfs_xdr.h> | |
19 | ||
20 | #include "nfs4_fs.h" | |
21 | #include "delegation.h" | |
22 | #include "internal.h" | |
23 | ||
24 | static void nfs_free_delegation(struct nfs_delegation *delegation) | |
25 | { | |
26 | if (delegation->cred) { | |
27 | put_rpccred(delegation->cred); | |
28 | delegation->cred = NULL; | |
29 | } | |
30 | kfree_rcu(delegation, rcu); | |
31 | } | |
32 | ||
33 | /** | |
34 | * nfs_mark_delegation_referenced - set delegation's REFERENCED flag | |
35 | * @delegation: delegation to process | |
36 | * | |
37 | */ | |
38 | void nfs_mark_delegation_referenced(struct nfs_delegation *delegation) | |
39 | { | |
40 | set_bit(NFS_DELEGATION_REFERENCED, &delegation->flags); | |
41 | } | |
42 | ||
43 | /** | |
44 | * nfs_have_delegation - check if inode has a delegation | |
45 | * @inode: inode to check | |
46 | * @flags: delegation types to check for | |
47 | * | |
48 | * Returns one if inode has the indicated delegation, otherwise zero. | |
49 | */ | |
50 | int nfs_have_delegation(struct inode *inode, fmode_t flags) | |
51 | { | |
52 | struct nfs_delegation *delegation; | |
53 | int ret = 0; | |
54 | ||
55 | flags &= FMODE_READ|FMODE_WRITE; | |
56 | rcu_read_lock(); | |
57 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
58 | if (delegation != NULL && (delegation->type & flags) == flags) { | |
59 | nfs_mark_delegation_referenced(delegation); | |
60 | ret = 1; | |
61 | } | |
62 | rcu_read_unlock(); | |
63 | return ret; | |
64 | } | |
65 | ||
66 | static int nfs_delegation_claim_locks(struct nfs_open_context *ctx, struct nfs4_state *state) | |
67 | { | |
68 | struct inode *inode = state->inode; | |
69 | struct file_lock *fl; | |
70 | int status = 0; | |
71 | ||
72 | if (inode->i_flock == NULL) | |
73 | goto out; | |
74 | ||
75 | /* Protect inode->i_flock using the file locks lock */ | |
76 | lock_flocks(); | |
77 | for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) { | |
78 | if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK))) | |
79 | continue; | |
80 | if (nfs_file_open_context(fl->fl_file) != ctx) | |
81 | continue; | |
82 | unlock_flocks(); | |
83 | status = nfs4_lock_delegation_recall(state, fl); | |
84 | if (status < 0) | |
85 | goto out; | |
86 | lock_flocks(); | |
87 | } | |
88 | unlock_flocks(); | |
89 | out: | |
90 | return status; | |
91 | } | |
92 | ||
93 | static int nfs_delegation_claim_opens(struct inode *inode, const nfs4_stateid *stateid) | |
94 | { | |
95 | struct nfs_inode *nfsi = NFS_I(inode); | |
96 | struct nfs_open_context *ctx; | |
97 | struct nfs4_state *state; | |
98 | int err; | |
99 | ||
100 | again: | |
101 | spin_lock(&inode->i_lock); | |
102 | list_for_each_entry(ctx, &nfsi->open_files, list) { | |
103 | state = ctx->state; | |
104 | if (state == NULL) | |
105 | continue; | |
106 | if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) | |
107 | continue; | |
108 | if (memcmp(state->stateid.data, stateid->data, sizeof(state->stateid.data)) != 0) | |
109 | continue; | |
110 | get_nfs_open_context(ctx); | |
111 | spin_unlock(&inode->i_lock); | |
112 | err = nfs4_open_delegation_recall(ctx, state, stateid); | |
113 | if (err >= 0) | |
114 | err = nfs_delegation_claim_locks(ctx, state); | |
115 | put_nfs_open_context(ctx); | |
116 | if (err != 0) | |
117 | return err; | |
118 | goto again; | |
119 | } | |
120 | spin_unlock(&inode->i_lock); | |
121 | return 0; | |
122 | } | |
123 | ||
124 | /** | |
125 | * nfs_inode_reclaim_delegation - process a delegation reclaim request | |
126 | * @inode: inode to process | |
127 | * @cred: credential to use for request | |
128 | * @res: new delegation state from server | |
129 | * | |
130 | */ | |
131 | void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, | |
132 | struct nfs_openres *res) | |
133 | { | |
134 | struct nfs_delegation *delegation; | |
135 | struct rpc_cred *oldcred = NULL; | |
136 | ||
137 | rcu_read_lock(); | |
138 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
139 | if (delegation != NULL) { | |
140 | spin_lock(&delegation->lock); | |
141 | if (delegation->inode != NULL) { | |
142 | memcpy(delegation->stateid.data, res->delegation.data, | |
143 | sizeof(delegation->stateid.data)); | |
144 | delegation->type = res->delegation_type; | |
145 | delegation->maxsize = res->maxsize; | |
146 | oldcred = delegation->cred; | |
147 | delegation->cred = get_rpccred(cred); | |
148 | clear_bit(NFS_DELEGATION_NEED_RECLAIM, | |
149 | &delegation->flags); | |
150 | NFS_I(inode)->delegation_state = delegation->type; | |
151 | spin_unlock(&delegation->lock); | |
152 | put_rpccred(oldcred); | |
153 | rcu_read_unlock(); | |
154 | } else { | |
155 | /* We appear to have raced with a delegation return. */ | |
156 | spin_unlock(&delegation->lock); | |
157 | rcu_read_unlock(); | |
158 | nfs_inode_set_delegation(inode, cred, res); | |
159 | } | |
160 | } else { | |
161 | rcu_read_unlock(); | |
162 | } | |
163 | } | |
164 | ||
165 | static int nfs_do_return_delegation(struct inode *inode, struct nfs_delegation *delegation, int issync) | |
166 | { | |
167 | int res = 0; | |
168 | ||
169 | res = nfs4_proc_delegreturn(inode, delegation->cred, &delegation->stateid, issync); | |
170 | nfs_free_delegation(delegation); | |
171 | return res; | |
172 | } | |
173 | ||
174 | static struct inode *nfs_delegation_grab_inode(struct nfs_delegation *delegation) | |
175 | { | |
176 | struct inode *inode = NULL; | |
177 | ||
178 | spin_lock(&delegation->lock); | |
179 | if (delegation->inode != NULL) | |
180 | inode = igrab(delegation->inode); | |
181 | spin_unlock(&delegation->lock); | |
182 | return inode; | |
183 | } | |
184 | ||
185 | static struct nfs_delegation * | |
186 | nfs_detach_delegation_locked(struct nfs_inode *nfsi, | |
187 | struct nfs_server *server) | |
188 | { | |
189 | struct nfs_delegation *delegation = | |
190 | rcu_dereference_protected(nfsi->delegation, | |
191 | lockdep_is_held(&server->nfs_client->cl_lock)); | |
192 | ||
193 | if (delegation == NULL) | |
194 | goto nomatch; | |
195 | ||
196 | spin_lock(&delegation->lock); | |
197 | list_del_rcu(&delegation->super_list); | |
198 | delegation->inode = NULL; | |
199 | nfsi->delegation_state = 0; | |
200 | rcu_assign_pointer(nfsi->delegation, NULL); | |
201 | spin_unlock(&delegation->lock); | |
202 | return delegation; | |
203 | nomatch: | |
204 | return NULL; | |
205 | } | |
206 | ||
207 | static struct nfs_delegation *nfs_detach_delegation(struct nfs_inode *nfsi, | |
208 | struct nfs_server *server) | |
209 | { | |
210 | struct nfs_client *clp = server->nfs_client; | |
211 | struct nfs_delegation *delegation; | |
212 | ||
213 | spin_lock(&clp->cl_lock); | |
214 | delegation = nfs_detach_delegation_locked(nfsi, server); | |
215 | spin_unlock(&clp->cl_lock); | |
216 | return delegation; | |
217 | } | |
218 | ||
219 | /** | |
220 | * nfs_inode_set_delegation - set up a delegation on an inode | |
221 | * @inode: inode to which delegation applies | |
222 | * @cred: cred to use for subsequent delegation processing | |
223 | * @res: new delegation state from server | |
224 | * | |
225 | * Returns zero on success, or a negative errno value. | |
226 | */ | |
227 | int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res) | |
228 | { | |
229 | struct nfs_server *server = NFS_SERVER(inode); | |
230 | struct nfs_client *clp = server->nfs_client; | |
231 | struct nfs_inode *nfsi = NFS_I(inode); | |
232 | struct nfs_delegation *delegation, *old_delegation; | |
233 | struct nfs_delegation *freeme = NULL; | |
234 | int status = 0; | |
235 | ||
236 | delegation = kmalloc(sizeof(*delegation), GFP_NOFS); | |
237 | if (delegation == NULL) | |
238 | return -ENOMEM; | |
239 | memcpy(delegation->stateid.data, res->delegation.data, | |
240 | sizeof(delegation->stateid.data)); | |
241 | delegation->type = res->delegation_type; | |
242 | delegation->maxsize = res->maxsize; | |
243 | delegation->change_attr = inode->i_version; | |
244 | delegation->cred = get_rpccred(cred); | |
245 | delegation->inode = inode; | |
246 | delegation->flags = 1<<NFS_DELEGATION_REFERENCED; | |
247 | spin_lock_init(&delegation->lock); | |
248 | ||
249 | spin_lock(&clp->cl_lock); | |
250 | old_delegation = rcu_dereference_protected(nfsi->delegation, | |
251 | lockdep_is_held(&clp->cl_lock)); | |
252 | if (old_delegation != NULL) { | |
253 | if (memcmp(&delegation->stateid, &old_delegation->stateid, | |
254 | sizeof(old_delegation->stateid)) == 0 && | |
255 | delegation->type == old_delegation->type) { | |
256 | goto out; | |
257 | } | |
258 | /* | |
259 | * Deal with broken servers that hand out two | |
260 | * delegations for the same file. | |
261 | */ | |
262 | dfprintk(FILE, "%s: server %s handed out " | |
263 | "a duplicate delegation!\n", | |
264 | __func__, clp->cl_hostname); | |
265 | if (delegation->type <= old_delegation->type) { | |
266 | freeme = delegation; | |
267 | delegation = NULL; | |
268 | goto out; | |
269 | } | |
270 | freeme = nfs_detach_delegation_locked(nfsi, server); | |
271 | } | |
272 | list_add_rcu(&delegation->super_list, &server->delegations); | |
273 | nfsi->delegation_state = delegation->type; | |
274 | rcu_assign_pointer(nfsi->delegation, delegation); | |
275 | delegation = NULL; | |
276 | ||
277 | /* Ensure we revalidate the attributes and page cache! */ | |
278 | spin_lock(&inode->i_lock); | |
279 | nfsi->cache_validity |= NFS_INO_REVAL_FORCED; | |
280 | spin_unlock(&inode->i_lock); | |
281 | ||
282 | out: | |
283 | spin_unlock(&clp->cl_lock); | |
284 | if (delegation != NULL) | |
285 | nfs_free_delegation(delegation); | |
286 | if (freeme != NULL) | |
287 | nfs_do_return_delegation(inode, freeme, 0); | |
288 | return status; | |
289 | } | |
290 | ||
291 | /* | |
292 | * Basic procedure for returning a delegation to the server | |
293 | */ | |
294 | static int __nfs_inode_return_delegation(struct inode *inode, struct nfs_delegation *delegation, int issync) | |
295 | { | |
296 | struct nfs_inode *nfsi = NFS_I(inode); | |
297 | int err; | |
298 | ||
299 | /* | |
300 | * Guard against new delegated open/lock/unlock calls and against | |
301 | * state recovery | |
302 | */ | |
303 | down_write(&nfsi->rwsem); | |
304 | err = nfs_delegation_claim_opens(inode, &delegation->stateid); | |
305 | up_write(&nfsi->rwsem); | |
306 | if (err) | |
307 | goto out; | |
308 | ||
309 | err = nfs_do_return_delegation(inode, delegation, issync); | |
310 | out: | |
311 | return err; | |
312 | } | |
313 | ||
314 | /** | |
315 | * nfs_client_return_marked_delegations - return previously marked delegations | |
316 | * @clp: nfs_client to process | |
317 | * | |
318 | * Returns zero on success, or a negative errno value. | |
319 | */ | |
320 | int nfs_client_return_marked_delegations(struct nfs_client *clp) | |
321 | { | |
322 | struct nfs_delegation *delegation; | |
323 | struct nfs_server *server; | |
324 | struct inode *inode; | |
325 | int err = 0; | |
326 | ||
327 | restart: | |
328 | rcu_read_lock(); | |
329 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { | |
330 | list_for_each_entry_rcu(delegation, &server->delegations, | |
331 | super_list) { | |
332 | if (!test_and_clear_bit(NFS_DELEGATION_RETURN, | |
333 | &delegation->flags)) | |
334 | continue; | |
335 | inode = nfs_delegation_grab_inode(delegation); | |
336 | if (inode == NULL) | |
337 | continue; | |
338 | delegation = nfs_detach_delegation(NFS_I(inode), | |
339 | server); | |
340 | rcu_read_unlock(); | |
341 | ||
342 | if (delegation != NULL) { | |
343 | filemap_flush(inode->i_mapping); | |
344 | err = __nfs_inode_return_delegation(inode, | |
345 | delegation, 0); | |
346 | } | |
347 | iput(inode); | |
348 | if (!err) | |
349 | goto restart; | |
350 | set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state); | |
351 | return err; | |
352 | } | |
353 | } | |
354 | rcu_read_unlock(); | |
355 | return 0; | |
356 | } | |
357 | ||
358 | /** | |
359 | * nfs_inode_return_delegation_noreclaim - return delegation, don't reclaim opens | |
360 | * @inode: inode to process | |
361 | * | |
362 | * Does not protect against delegation reclaims, therefore really only safe | |
363 | * to be called from nfs4_clear_inode(). | |
364 | */ | |
365 | void nfs_inode_return_delegation_noreclaim(struct inode *inode) | |
366 | { | |
367 | struct nfs_server *server = NFS_SERVER(inode); | |
368 | struct nfs_inode *nfsi = NFS_I(inode); | |
369 | struct nfs_delegation *delegation; | |
370 | ||
371 | if (rcu_access_pointer(nfsi->delegation) != NULL) { | |
372 | delegation = nfs_detach_delegation(nfsi, server); | |
373 | if (delegation != NULL) | |
374 | nfs_do_return_delegation(inode, delegation, 0); | |
375 | } | |
376 | } | |
377 | ||
378 | /** | |
379 | * nfs_inode_return_delegation - synchronously return a delegation | |
380 | * @inode: inode to process | |
381 | * | |
382 | * Returns zero on success, or a negative errno value. | |
383 | */ | |
384 | int nfs_inode_return_delegation(struct inode *inode) | |
385 | { | |
386 | struct nfs_server *server = NFS_SERVER(inode); | |
387 | struct nfs_inode *nfsi = NFS_I(inode); | |
388 | struct nfs_delegation *delegation; | |
389 | int err = 0; | |
390 | ||
391 | if (rcu_access_pointer(nfsi->delegation) != NULL) { | |
392 | delegation = nfs_detach_delegation(nfsi, server); | |
393 | if (delegation != NULL) { | |
394 | nfs_wb_all(inode); | |
395 | err = __nfs_inode_return_delegation(inode, delegation, 1); | |
396 | } | |
397 | } | |
398 | return err; | |
399 | } | |
400 | ||
401 | static void nfs_mark_return_delegation(struct nfs_server *server, | |
402 | struct nfs_delegation *delegation) | |
403 | { | |
404 | set_bit(NFS_DELEGATION_RETURN, &delegation->flags); | |
405 | set_bit(NFS4CLNT_DELEGRETURN, &server->nfs_client->cl_state); | |
406 | } | |
407 | ||
408 | /** | |
409 | * nfs_super_return_all_delegations - return delegations for one superblock | |
410 | * @sb: sb to process | |
411 | * | |
412 | */ | |
413 | void nfs_super_return_all_delegations(struct super_block *sb) | |
414 | { | |
415 | struct nfs_server *server = NFS_SB(sb); | |
416 | struct nfs_client *clp = server->nfs_client; | |
417 | struct nfs_delegation *delegation; | |
418 | ||
419 | if (clp == NULL) | |
420 | return; | |
421 | ||
422 | rcu_read_lock(); | |
423 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { | |
424 | spin_lock(&delegation->lock); | |
425 | set_bit(NFS_DELEGATION_RETURN, &delegation->flags); | |
426 | spin_unlock(&delegation->lock); | |
427 | } | |
428 | rcu_read_unlock(); | |
429 | ||
430 | if (nfs_client_return_marked_delegations(clp) != 0) | |
431 | nfs4_schedule_state_manager(clp); | |
432 | } | |
433 | ||
434 | static void nfs_mark_return_all_delegation_types(struct nfs_server *server, | |
435 | fmode_t flags) | |
436 | { | |
437 | struct nfs_delegation *delegation; | |
438 | ||
439 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { | |
440 | if ((delegation->type == (FMODE_READ|FMODE_WRITE)) && !(flags & FMODE_WRITE)) | |
441 | continue; | |
442 | if (delegation->type & flags) | |
443 | nfs_mark_return_delegation(server, delegation); | |
444 | } | |
445 | } | |
446 | ||
447 | static void nfs_client_mark_return_all_delegation_types(struct nfs_client *clp, | |
448 | fmode_t flags) | |
449 | { | |
450 | struct nfs_server *server; | |
451 | ||
452 | rcu_read_lock(); | |
453 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
454 | nfs_mark_return_all_delegation_types(server, flags); | |
455 | rcu_read_unlock(); | |
456 | } | |
457 | ||
458 | static void nfs_client_mark_return_all_delegations(struct nfs_client *clp) | |
459 | { | |
460 | nfs_client_mark_return_all_delegation_types(clp, FMODE_READ|FMODE_WRITE); | |
461 | } | |
462 | ||
463 | static void nfs_delegation_run_state_manager(struct nfs_client *clp) | |
464 | { | |
465 | if (test_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) | |
466 | nfs4_schedule_state_manager(clp); | |
467 | } | |
468 | ||
469 | void nfs_remove_bad_delegation(struct inode *inode) | |
470 | { | |
471 | struct nfs_delegation *delegation; | |
472 | ||
473 | delegation = nfs_detach_delegation(NFS_I(inode), NFS_SERVER(inode)); | |
474 | if (delegation) { | |
475 | nfs_inode_find_state_and_recover(inode, &delegation->stateid); | |
476 | nfs_free_delegation(delegation); | |
477 | } | |
478 | } | |
479 | ||
480 | /** | |
481 | * nfs_expire_all_delegation_types | |
482 | * @clp: client to process | |
483 | * @flags: delegation types to expire | |
484 | * | |
485 | */ | |
486 | void nfs_expire_all_delegation_types(struct nfs_client *clp, fmode_t flags) | |
487 | { | |
488 | nfs_client_mark_return_all_delegation_types(clp, flags); | |
489 | nfs_delegation_run_state_manager(clp); | |
490 | } | |
491 | ||
492 | /** | |
493 | * nfs_expire_all_delegations | |
494 | * @clp: client to process | |
495 | * | |
496 | */ | |
497 | void nfs_expire_all_delegations(struct nfs_client *clp) | |
498 | { | |
499 | nfs_expire_all_delegation_types(clp, FMODE_READ|FMODE_WRITE); | |
500 | } | |
501 | ||
502 | /** | |
503 | * nfs_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN | |
504 | * @clp: client to process | |
505 | * | |
506 | */ | |
507 | void nfs_handle_cb_pathdown(struct nfs_client *clp) | |
508 | { | |
509 | if (clp == NULL) | |
510 | return; | |
511 | nfs_client_mark_return_all_delegations(clp); | |
512 | } | |
513 | ||
514 | static void nfs_mark_return_unreferenced_delegations(struct nfs_server *server) | |
515 | { | |
516 | struct nfs_delegation *delegation; | |
517 | ||
518 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { | |
519 | if (test_and_clear_bit(NFS_DELEGATION_REFERENCED, &delegation->flags)) | |
520 | continue; | |
521 | nfs_mark_return_delegation(server, delegation); | |
522 | } | |
523 | } | |
524 | ||
525 | /** | |
526 | * nfs_expire_unreferenced_delegations - Eliminate unused delegations | |
527 | * @clp: nfs_client to process | |
528 | * | |
529 | */ | |
530 | void nfs_expire_unreferenced_delegations(struct nfs_client *clp) | |
531 | { | |
532 | struct nfs_server *server; | |
533 | ||
534 | rcu_read_lock(); | |
535 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
536 | nfs_mark_return_unreferenced_delegations(server); | |
537 | rcu_read_unlock(); | |
538 | ||
539 | nfs_delegation_run_state_manager(clp); | |
540 | } | |
541 | ||
542 | /** | |
543 | * nfs_async_inode_return_delegation - asynchronously return a delegation | |
544 | * @inode: inode to process | |
545 | * @stateid: state ID information from CB_RECALL arguments | |
546 | * | |
547 | * Returns zero on success, or a negative errno value. | |
548 | */ | |
549 | int nfs_async_inode_return_delegation(struct inode *inode, | |
550 | const nfs4_stateid *stateid) | |
551 | { | |
552 | struct nfs_server *server = NFS_SERVER(inode); | |
553 | struct nfs_client *clp = server->nfs_client; | |
554 | struct nfs_delegation *delegation; | |
555 | ||
556 | rcu_read_lock(); | |
557 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
558 | ||
559 | if (!clp->cl_mvops->validate_stateid(delegation, stateid)) { | |
560 | rcu_read_unlock(); | |
561 | return -ENOENT; | |
562 | } | |
563 | nfs_mark_return_delegation(server, delegation); | |
564 | rcu_read_unlock(); | |
565 | ||
566 | nfs_delegation_run_state_manager(clp); | |
567 | return 0; | |
568 | } | |
569 | ||
570 | static struct inode * | |
571 | nfs_delegation_find_inode_server(struct nfs_server *server, | |
572 | const struct nfs_fh *fhandle) | |
573 | { | |
574 | struct nfs_delegation *delegation; | |
575 | struct inode *res = NULL; | |
576 | ||
577 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { | |
578 | spin_lock(&delegation->lock); | |
579 | if (delegation->inode != NULL && | |
580 | nfs_compare_fh(fhandle, &NFS_I(delegation->inode)->fh) == 0) { | |
581 | res = igrab(delegation->inode); | |
582 | } | |
583 | spin_unlock(&delegation->lock); | |
584 | if (res != NULL) | |
585 | break; | |
586 | } | |
587 | return res; | |
588 | } | |
589 | ||
590 | /** | |
591 | * nfs_delegation_find_inode - retrieve the inode associated with a delegation | |
592 | * @clp: client state handle | |
593 | * @fhandle: filehandle from a delegation recall | |
594 | * | |
595 | * Returns pointer to inode matching "fhandle," or NULL if a matching inode | |
596 | * cannot be found. | |
597 | */ | |
598 | struct inode *nfs_delegation_find_inode(struct nfs_client *clp, | |
599 | const struct nfs_fh *fhandle) | |
600 | { | |
601 | struct nfs_server *server; | |
602 | struct inode *res = NULL; | |
603 | ||
604 | rcu_read_lock(); | |
605 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { | |
606 | res = nfs_delegation_find_inode_server(server, fhandle); | |
607 | if (res != NULL) | |
608 | break; | |
609 | } | |
610 | rcu_read_unlock(); | |
611 | return res; | |
612 | } | |
613 | ||
614 | static void nfs_delegation_mark_reclaim_server(struct nfs_server *server) | |
615 | { | |
616 | struct nfs_delegation *delegation; | |
617 | ||
618 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) | |
619 | set_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags); | |
620 | } | |
621 | ||
622 | /** | |
623 | * nfs_delegation_mark_reclaim - mark all delegations as needing to be reclaimed | |
624 | * @clp: nfs_client to process | |
625 | * | |
626 | */ | |
627 | void nfs_delegation_mark_reclaim(struct nfs_client *clp) | |
628 | { | |
629 | struct nfs_server *server; | |
630 | ||
631 | rcu_read_lock(); | |
632 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
633 | nfs_delegation_mark_reclaim_server(server); | |
634 | rcu_read_unlock(); | |
635 | } | |
636 | ||
637 | /** | |
638 | * nfs_delegation_reap_unclaimed - reap unclaimed delegations after reboot recovery is done | |
639 | * @clp: nfs_client to process | |
640 | * | |
641 | */ | |
642 | void nfs_delegation_reap_unclaimed(struct nfs_client *clp) | |
643 | { | |
644 | struct nfs_delegation *delegation; | |
645 | struct nfs_server *server; | |
646 | struct inode *inode; | |
647 | ||
648 | restart: | |
649 | rcu_read_lock(); | |
650 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { | |
651 | list_for_each_entry_rcu(delegation, &server->delegations, | |
652 | super_list) { | |
653 | if (test_bit(NFS_DELEGATION_NEED_RECLAIM, | |
654 | &delegation->flags) == 0) | |
655 | continue; | |
656 | inode = nfs_delegation_grab_inode(delegation); | |
657 | if (inode == NULL) | |
658 | continue; | |
659 | delegation = nfs_detach_delegation(NFS_I(inode), | |
660 | server); | |
661 | rcu_read_unlock(); | |
662 | ||
663 | if (delegation != NULL) | |
664 | nfs_free_delegation(delegation); | |
665 | iput(inode); | |
666 | goto restart; | |
667 | } | |
668 | } | |
669 | rcu_read_unlock(); | |
670 | } | |
671 | ||
672 | /** | |
673 | * nfs_delegations_present - check for existence of delegations | |
674 | * @clp: client state handle | |
675 | * | |
676 | * Returns one if there are any nfs_delegation structures attached | |
677 | * to this nfs_client. | |
678 | */ | |
679 | int nfs_delegations_present(struct nfs_client *clp) | |
680 | { | |
681 | struct nfs_server *server; | |
682 | int ret = 0; | |
683 | ||
684 | rcu_read_lock(); | |
685 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
686 | if (!list_empty(&server->delegations)) { | |
687 | ret = 1; | |
688 | break; | |
689 | } | |
690 | rcu_read_unlock(); | |
691 | return ret; | |
692 | } | |
693 | ||
694 | /** | |
695 | * nfs4_copy_delegation_stateid - Copy inode's state ID information | |
696 | * @dst: stateid data structure to fill in | |
697 | * @inode: inode to check | |
698 | * | |
699 | * Returns one and fills in "dst->data" * if inode had a delegation, | |
700 | * otherwise zero is returned. | |
701 | */ | |
702 | int nfs4_copy_delegation_stateid(nfs4_stateid *dst, struct inode *inode) | |
703 | { | |
704 | struct nfs_inode *nfsi = NFS_I(inode); | |
705 | struct nfs_delegation *delegation; | |
706 | int ret = 0; | |
707 | ||
708 | rcu_read_lock(); | |
709 | delegation = rcu_dereference(nfsi->delegation); | |
710 | if (delegation != NULL) { | |
711 | memcpy(dst->data, delegation->stateid.data, sizeof(dst->data)); | |
712 | ret = 1; | |
713 | } | |
714 | rcu_read_unlock(); | |
715 | return ret; | |
716 | } |