Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/nfs/delegation.c | |
3 | * | |
4 | * Copyright (C) 2004 Trond Myklebust | |
5 | * | |
6 | * NFS file delegation management | |
7 | * | |
8 | */ | |
1da177e4 | 9 | #include <linux/completion.h> |
58d9714a | 10 | #include <linux/kthread.h> |
1da177e4 LT |
11 | #include <linux/module.h> |
12 | #include <linux/sched.h> | |
5a0e3ad6 | 13 | #include <linux/slab.h> |
1da177e4 LT |
14 | #include <linux/spinlock.h> |
15 | ||
16 | #include <linux/nfs4.h> | |
17 | #include <linux/nfs_fs.h> | |
18 | #include <linux/nfs_xdr.h> | |
19 | ||
4ce79717 | 20 | #include "nfs4_fs.h" |
1da177e4 | 21 | #include "delegation.h" |
24c8dbbb | 22 | #include "internal.h" |
1da177e4 | 23 | |
905f8d16 | 24 | static void nfs_do_free_delegation(struct nfs_delegation *delegation) |
1da177e4 | 25 | { |
1da177e4 LT |
26 | kfree(delegation); |
27 | } | |
28 | ||
8383e460 TM |
29 | static void nfs_free_delegation_callback(struct rcu_head *head) |
30 | { | |
31 | struct nfs_delegation *delegation = container_of(head, struct nfs_delegation, rcu); | |
32 | ||
905f8d16 TM |
33 | nfs_do_free_delegation(delegation); |
34 | } | |
35 | ||
36 | static void nfs_free_delegation(struct nfs_delegation *delegation) | |
37 | { | |
e00b8a24 TM |
38 | if (delegation->cred) { |
39 | put_rpccred(delegation->cred); | |
40 | delegation->cred = NULL; | |
41 | } | |
905f8d16 | 42 | call_rcu(&delegation->rcu, nfs_free_delegation_callback); |
8383e460 TM |
43 | } |
44 | ||
d3978bb3 CL |
45 | /** |
46 | * nfs_mark_delegation_referenced - set delegation's REFERENCED flag | |
47 | * @delegation: delegation to process | |
48 | * | |
49 | */ | |
b7391f44 TM |
50 | void nfs_mark_delegation_referenced(struct nfs_delegation *delegation) |
51 | { | |
52 | set_bit(NFS_DELEGATION_REFERENCED, &delegation->flags); | |
53 | } | |
54 | ||
d3978bb3 CL |
55 | /** |
56 | * nfs_have_delegation - check if inode has a delegation | |
57 | * @inode: inode to check | |
58 | * @flags: delegation types to check for | |
59 | * | |
60 | * Returns one if inode has the indicated delegation, otherwise zero. | |
61 | */ | |
bd7bf9d5 | 62 | int nfs_have_delegation(struct inode *inode, fmode_t flags) |
b7391f44 TM |
63 | { |
64 | struct nfs_delegation *delegation; | |
65 | int ret = 0; | |
66 | ||
67 | flags &= FMODE_READ|FMODE_WRITE; | |
68 | rcu_read_lock(); | |
69 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
70 | if (delegation != NULL && (delegation->type & flags) == flags) { | |
71 | nfs_mark_delegation_referenced(delegation); | |
72 | ret = 1; | |
73 | } | |
74 | rcu_read_unlock(); | |
75 | return ret; | |
76 | } | |
77 | ||
888e694c TM |
78 | static int nfs_delegation_claim_locks(struct nfs_open_context *ctx, struct nfs4_state *state) |
79 | { | |
80 | struct inode *inode = state->inode; | |
81 | struct file_lock *fl; | |
d5122201 | 82 | int status = 0; |
888e694c | 83 | |
3f09df70 TM |
84 | if (inode->i_flock == NULL) |
85 | goto out; | |
86 | ||
b89f4321 AB |
87 | /* Protect inode->i_flock using the file locks lock */ |
88 | lock_flocks(); | |
90dc7d27 | 89 | for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) { |
888e694c TM |
90 | if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK))) |
91 | continue; | |
cd3758e3 | 92 | if (nfs_file_open_context(fl->fl_file) != ctx) |
888e694c | 93 | continue; |
b89f4321 | 94 | unlock_flocks(); |
888e694c | 95 | status = nfs4_lock_delegation_recall(state, fl); |
d5122201 | 96 | if (status < 0) |
3f09df70 | 97 | goto out; |
b89f4321 | 98 | lock_flocks(); |
888e694c | 99 | } |
b89f4321 | 100 | unlock_flocks(); |
3f09df70 | 101 | out: |
888e694c TM |
102 | return status; |
103 | } | |
104 | ||
d18cc1fd | 105 | static int nfs_delegation_claim_opens(struct inode *inode, const nfs4_stateid *stateid) |
1da177e4 LT |
106 | { |
107 | struct nfs_inode *nfsi = NFS_I(inode); | |
108 | struct nfs_open_context *ctx; | |
109 | struct nfs4_state *state; | |
888e694c | 110 | int err; |
1da177e4 LT |
111 | |
112 | again: | |
113 | spin_lock(&inode->i_lock); | |
114 | list_for_each_entry(ctx, &nfsi->open_files, list) { | |
115 | state = ctx->state; | |
116 | if (state == NULL) | |
117 | continue; | |
118 | if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) | |
119 | continue; | |
90163027 TM |
120 | if (memcmp(state->stateid.data, stateid->data, sizeof(state->stateid.data)) != 0) |
121 | continue; | |
1da177e4 LT |
122 | get_nfs_open_context(ctx); |
123 | spin_unlock(&inode->i_lock); | |
13437e12 | 124 | err = nfs4_open_delegation_recall(ctx, state, stateid); |
888e694c TM |
125 | if (err >= 0) |
126 | err = nfs_delegation_claim_locks(ctx, state); | |
1da177e4 | 127 | put_nfs_open_context(ctx); |
888e694c | 128 | if (err != 0) |
d18cc1fd | 129 | return err; |
1da177e4 LT |
130 | goto again; |
131 | } | |
132 | spin_unlock(&inode->i_lock); | |
d18cc1fd | 133 | return 0; |
1da177e4 LT |
134 | } |
135 | ||
d3978bb3 CL |
136 | /** |
137 | * nfs_inode_reclaim_delegation - process a delegation reclaim request | |
138 | * @inode: inode to process | |
139 | * @cred: credential to use for request | |
140 | * @res: new delegation state from server | |
141 | * | |
1da177e4 | 142 | */ |
d3978bb3 CL |
143 | void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, |
144 | struct nfs_openres *res) | |
1da177e4 | 145 | { |
8f649c37 TM |
146 | struct nfs_delegation *delegation; |
147 | struct rpc_cred *oldcred = NULL; | |
1da177e4 | 148 | |
8f649c37 TM |
149 | rcu_read_lock(); |
150 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
151 | if (delegation != NULL) { | |
152 | spin_lock(&delegation->lock); | |
153 | if (delegation->inode != NULL) { | |
154 | memcpy(delegation->stateid.data, res->delegation.data, | |
155 | sizeof(delegation->stateid.data)); | |
156 | delegation->type = res->delegation_type; | |
157 | delegation->maxsize = res->maxsize; | |
158 | oldcred = delegation->cred; | |
159 | delegation->cred = get_rpccred(cred); | |
160 | clear_bit(NFS_DELEGATION_NEED_RECLAIM, | |
161 | &delegation->flags); | |
162 | NFS_I(inode)->delegation_state = delegation->type; | |
163 | spin_unlock(&delegation->lock); | |
164 | put_rpccred(oldcred); | |
165 | rcu_read_unlock(); | |
166 | } else { | |
167 | /* We appear to have raced with a delegation return. */ | |
168 | spin_unlock(&delegation->lock); | |
169 | rcu_read_unlock(); | |
170 | nfs_inode_set_delegation(inode, cred, res); | |
171 | } | |
172 | } else { | |
173 | rcu_read_unlock(); | |
174 | } | |
1da177e4 LT |
175 | } |
176 | ||
57bfa891 TM |
177 | static int nfs_do_return_delegation(struct inode *inode, struct nfs_delegation *delegation, int issync) |
178 | { | |
179 | int res = 0; | |
180 | ||
181 | res = nfs4_proc_delegreturn(inode, delegation->cred, &delegation->stateid, issync); | |
182 | nfs_free_delegation(delegation); | |
183 | return res; | |
184 | } | |
185 | ||
86e89489 TM |
186 | static struct inode *nfs_delegation_grab_inode(struct nfs_delegation *delegation) |
187 | { | |
188 | struct inode *inode = NULL; | |
189 | ||
190 | spin_lock(&delegation->lock); | |
191 | if (delegation->inode != NULL) | |
192 | inode = igrab(delegation->inode); | |
193 | spin_unlock(&delegation->lock); | |
194 | return inode; | |
195 | } | |
196 | ||
dda4b225 CL |
197 | static struct nfs_delegation * |
198 | nfs_detach_delegation_locked(struct nfs_inode *nfsi, | |
d3978bb3 | 199 | struct nfs_server *server) |
57bfa891 | 200 | { |
17d2c0a0 DH |
201 | struct nfs_delegation *delegation = |
202 | rcu_dereference_protected(nfsi->delegation, | |
d3978bb3 | 203 | lockdep_is_held(&server->nfs_client->cl_lock)); |
57bfa891 TM |
204 | |
205 | if (delegation == NULL) | |
206 | goto nomatch; | |
dda4b225 | 207 | |
34310430 | 208 | spin_lock(&delegation->lock); |
57bfa891 | 209 | list_del_rcu(&delegation->super_list); |
86e89489 | 210 | delegation->inode = NULL; |
57bfa891 TM |
211 | nfsi->delegation_state = 0; |
212 | rcu_assign_pointer(nfsi->delegation, NULL); | |
34310430 | 213 | spin_unlock(&delegation->lock); |
57bfa891 TM |
214 | return delegation; |
215 | nomatch: | |
216 | return NULL; | |
217 | } | |
218 | ||
dda4b225 | 219 | static struct nfs_delegation *nfs_detach_delegation(struct nfs_inode *nfsi, |
d3978bb3 | 220 | struct nfs_server *server) |
dda4b225 | 221 | { |
d3978bb3 | 222 | struct nfs_client *clp = server->nfs_client; |
dda4b225 CL |
223 | struct nfs_delegation *delegation; |
224 | ||
225 | spin_lock(&clp->cl_lock); | |
d3978bb3 | 226 | delegation = nfs_detach_delegation_locked(nfsi, server); |
dda4b225 CL |
227 | spin_unlock(&clp->cl_lock); |
228 | return delegation; | |
229 | } | |
230 | ||
d3978bb3 CL |
231 | /** |
232 | * nfs_inode_set_delegation - set up a delegation on an inode | |
233 | * @inode: inode to which delegation applies | |
234 | * @cred: cred to use for subsequent delegation processing | |
235 | * @res: new delegation state from server | |
236 | * | |
237 | * Returns zero on success, or a negative errno value. | |
1da177e4 LT |
238 | */ |
239 | int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res) | |
240 | { | |
d3978bb3 CL |
241 | struct nfs_server *server = NFS_SERVER(inode); |
242 | struct nfs_client *clp = server->nfs_client; | |
1da177e4 | 243 | struct nfs_inode *nfsi = NFS_I(inode); |
17d2c0a0 | 244 | struct nfs_delegation *delegation, *old_delegation; |
57bfa891 | 245 | struct nfs_delegation *freeme = NULL; |
1da177e4 LT |
246 | int status = 0; |
247 | ||
8535b2be | 248 | delegation = kmalloc(sizeof(*delegation), GFP_NOFS); |
1da177e4 LT |
249 | if (delegation == NULL) |
250 | return -ENOMEM; | |
251 | memcpy(delegation->stateid.data, res->delegation.data, | |
252 | sizeof(delegation->stateid.data)); | |
253 | delegation->type = res->delegation_type; | |
254 | delegation->maxsize = res->maxsize; | |
beb2a5ec | 255 | delegation->change_attr = nfsi->change_attr; |
1da177e4 LT |
256 | delegation->cred = get_rpccred(cred); |
257 | delegation->inode = inode; | |
b7391f44 | 258 | delegation->flags = 1<<NFS_DELEGATION_REFERENCED; |
34310430 | 259 | spin_lock_init(&delegation->lock); |
1da177e4 LT |
260 | |
261 | spin_lock(&clp->cl_lock); | |
17d2c0a0 | 262 | old_delegation = rcu_dereference_protected(nfsi->delegation, |
d3978bb3 | 263 | lockdep_is_held(&clp->cl_lock)); |
17d2c0a0 DH |
264 | if (old_delegation != NULL) { |
265 | if (memcmp(&delegation->stateid, &old_delegation->stateid, | |
266 | sizeof(old_delegation->stateid)) == 0 && | |
267 | delegation->type == old_delegation->type) { | |
57bfa891 | 268 | goto out; |
1da177e4 | 269 | } |
57bfa891 TM |
270 | /* |
271 | * Deal with broken servers that hand out two | |
272 | * delegations for the same file. | |
273 | */ | |
274 | dfprintk(FILE, "%s: server %s handed out " | |
275 | "a duplicate delegation!\n", | |
3110ff80 | 276 | __func__, clp->cl_hostname); |
17d2c0a0 | 277 | if (delegation->type <= old_delegation->type) { |
57bfa891 TM |
278 | freeme = delegation; |
279 | delegation = NULL; | |
280 | goto out; | |
281 | } | |
d3978bb3 | 282 | freeme = nfs_detach_delegation_locked(nfsi, server); |
1da177e4 | 283 | } |
d3978bb3 | 284 | list_add_rcu(&delegation->super_list, &server->delegations); |
57bfa891 TM |
285 | nfsi->delegation_state = delegation->type; |
286 | rcu_assign_pointer(nfsi->delegation, delegation); | |
287 | delegation = NULL; | |
412c77ce TM |
288 | |
289 | /* Ensure we revalidate the attributes and page cache! */ | |
290 | spin_lock(&inode->i_lock); | |
291 | nfsi->cache_validity |= NFS_INO_REVAL_FORCED; | |
292 | spin_unlock(&inode->i_lock); | |
293 | ||
57bfa891 | 294 | out: |
1da177e4 | 295 | spin_unlock(&clp->cl_lock); |
603c83da TM |
296 | if (delegation != NULL) |
297 | nfs_free_delegation(delegation); | |
57bfa891 TM |
298 | if (freeme != NULL) |
299 | nfs_do_return_delegation(inode, freeme, 0); | |
1da177e4 LT |
300 | return status; |
301 | } | |
302 | ||
1da177e4 LT |
303 | /* |
304 | * Basic procedure for returning a delegation to the server | |
305 | */ | |
d18cc1fd | 306 | static int __nfs_inode_return_delegation(struct inode *inode, struct nfs_delegation *delegation, int issync) |
1da177e4 | 307 | { |
1da177e4 | 308 | struct nfs_inode *nfsi = NFS_I(inode); |
d18cc1fd | 309 | int err; |
1da177e4 | 310 | |
3f09df70 TM |
311 | /* |
312 | * Guard against new delegated open/lock/unlock calls and against | |
313 | * state recovery | |
314 | */ | |
1da177e4 | 315 | down_write(&nfsi->rwsem); |
d18cc1fd | 316 | err = nfs_delegation_claim_opens(inode, &delegation->stateid); |
1da177e4 | 317 | up_write(&nfsi->rwsem); |
d18cc1fd TM |
318 | if (err) |
319 | goto out; | |
1da177e4 | 320 | |
d18cc1fd TM |
321 | err = nfs_do_return_delegation(inode, delegation, issync); |
322 | out: | |
323 | return err; | |
90163027 TM |
324 | } |
325 | ||
d3978bb3 CL |
326 | /** |
327 | * nfs_client_return_marked_delegations - return previously marked delegations | |
328 | * @clp: nfs_client to process | |
329 | * | |
330 | * Returns zero on success, or a negative errno value. | |
515d8611 | 331 | */ |
d18cc1fd | 332 | int nfs_client_return_marked_delegations(struct nfs_client *clp) |
515d8611 TM |
333 | { |
334 | struct nfs_delegation *delegation; | |
d3978bb3 | 335 | struct nfs_server *server; |
515d8611 | 336 | struct inode *inode; |
d18cc1fd | 337 | int err = 0; |
515d8611 TM |
338 | |
339 | restart: | |
340 | rcu_read_lock(); | |
d3978bb3 CL |
341 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { |
342 | list_for_each_entry_rcu(delegation, &server->delegations, | |
343 | super_list) { | |
344 | if (!test_and_clear_bit(NFS_DELEGATION_RETURN, | |
345 | &delegation->flags)) | |
346 | continue; | |
347 | inode = nfs_delegation_grab_inode(delegation); | |
348 | if (inode == NULL) | |
349 | continue; | |
350 | delegation = nfs_detach_delegation(NFS_I(inode), | |
351 | server); | |
352 | rcu_read_unlock(); | |
353 | ||
354 | if (delegation != NULL) { | |
355 | filemap_flush(inode->i_mapping); | |
356 | err = __nfs_inode_return_delegation(inode, | |
357 | delegation, 0); | |
358 | } | |
359 | iput(inode); | |
360 | if (!err) | |
361 | goto restart; | |
362 | set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state); | |
363 | return err; | |
d18cc1fd | 364 | } |
515d8611 TM |
365 | } |
366 | rcu_read_unlock(); | |
d18cc1fd | 367 | return 0; |
515d8611 TM |
368 | } |
369 | ||
d3978bb3 CL |
370 | /** |
371 | * nfs_inode_return_delegation_noreclaim - return delegation, don't reclaim opens | |
372 | * @inode: inode to process | |
373 | * | |
374 | * Does not protect against delegation reclaims, therefore really only safe | |
375 | * to be called from nfs4_clear_inode(). | |
e6f81075 TM |
376 | */ |
377 | void nfs_inode_return_delegation_noreclaim(struct inode *inode) | |
378 | { | |
d3978bb3 | 379 | struct nfs_server *server = NFS_SERVER(inode); |
e6f81075 TM |
380 | struct nfs_inode *nfsi = NFS_I(inode); |
381 | struct nfs_delegation *delegation; | |
382 | ||
17d2c0a0 | 383 | if (rcu_access_pointer(nfsi->delegation) != NULL) { |
d3978bb3 | 384 | delegation = nfs_detach_delegation(nfsi, server); |
e6f81075 TM |
385 | if (delegation != NULL) |
386 | nfs_do_return_delegation(inode, delegation, 0); | |
387 | } | |
388 | } | |
389 | ||
d3978bb3 CL |
390 | /** |
391 | * nfs_inode_return_delegation - synchronously return a delegation | |
392 | * @inode: inode to process | |
393 | * | |
394 | * Returns zero on success, or a negative errno value. | |
395 | */ | |
90163027 TM |
396 | int nfs_inode_return_delegation(struct inode *inode) |
397 | { | |
d3978bb3 | 398 | struct nfs_server *server = NFS_SERVER(inode); |
90163027 TM |
399 | struct nfs_inode *nfsi = NFS_I(inode); |
400 | struct nfs_delegation *delegation; | |
401 | int err = 0; | |
402 | ||
17d2c0a0 | 403 | if (rcu_access_pointer(nfsi->delegation) != NULL) { |
d3978bb3 | 404 | delegation = nfs_detach_delegation(nfsi, server); |
d18cc1fd | 405 | if (delegation != NULL) { |
1b924e5f | 406 | nfs_wb_all(inode); |
d18cc1fd TM |
407 | err = __nfs_inode_return_delegation(inode, delegation, 1); |
408 | } | |
90163027 TM |
409 | } |
410 | return err; | |
1da177e4 LT |
411 | } |
412 | ||
d3978bb3 | 413 | static void nfs_mark_return_delegation(struct nfs_delegation *delegation) |
6411bd4a | 414 | { |
d3978bb3 CL |
415 | struct nfs_client *clp = NFS_SERVER(delegation->inode)->nfs_client; |
416 | ||
6411bd4a TM |
417 | set_bit(NFS_DELEGATION_RETURN, &delegation->flags); |
418 | set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state); | |
419 | } | |
420 | ||
d3978bb3 CL |
421 | /** |
422 | * nfs_super_return_all_delegations - return delegations for one superblock | |
423 | * @sb: sb to process | |
424 | * | |
1da177e4 | 425 | */ |
515d8611 | 426 | void nfs_super_return_all_delegations(struct super_block *sb) |
1da177e4 | 427 | { |
d3978bb3 CL |
428 | struct nfs_server *server = NFS_SB(sb); |
429 | struct nfs_client *clp = server->nfs_client; | |
1da177e4 | 430 | struct nfs_delegation *delegation; |
1da177e4 LT |
431 | |
432 | if (clp == NULL) | |
433 | return; | |
d3978bb3 | 434 | |
8383e460 | 435 | rcu_read_lock(); |
d3978bb3 | 436 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { |
86e89489 | 437 | spin_lock(&delegation->lock); |
d3978bb3 | 438 | set_bit(NFS_DELEGATION_RETURN, &delegation->flags); |
86e89489 | 439 | spin_unlock(&delegation->lock); |
1da177e4 | 440 | } |
8383e460 | 441 | rcu_read_unlock(); |
d3978bb3 | 442 | |
d18cc1fd TM |
443 | if (nfs_client_return_marked_delegations(clp) != 0) |
444 | nfs4_schedule_state_manager(clp); | |
515d8611 TM |
445 | } |
446 | ||
d3978bb3 CL |
447 | static void nfs_mark_return_all_delegation_types(struct nfs_server *server, |
448 | fmode_t flags) | |
515d8611 TM |
449 | { |
450 | struct nfs_delegation *delegation; | |
451 | ||
d3978bb3 | 452 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { |
c79571a5 AB |
453 | if ((delegation->type == (FMODE_READ|FMODE_WRITE)) && !(flags & FMODE_WRITE)) |
454 | continue; | |
455 | if (delegation->type & flags) | |
d3978bb3 | 456 | nfs_mark_return_delegation(delegation); |
707fb4b3 | 457 | } |
d3978bb3 CL |
458 | } |
459 | ||
460 | static void nfs_client_mark_return_all_delegation_types(struct nfs_client *clp, | |
461 | fmode_t flags) | |
462 | { | |
463 | struct nfs_server *server; | |
464 | ||
465 | rcu_read_lock(); | |
466 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
467 | nfs_mark_return_all_delegation_types(server, flags); | |
515d8611 | 468 | rcu_read_unlock(); |
1da177e4 LT |
469 | } |
470 | ||
c79571a5 AB |
471 | static void nfs_client_mark_return_all_delegations(struct nfs_client *clp) |
472 | { | |
473 | nfs_client_mark_return_all_delegation_types(clp, FMODE_READ|FMODE_WRITE); | |
474 | } | |
475 | ||
b0d3ded1 | 476 | static void nfs_delegation_run_state_manager(struct nfs_client *clp) |
58d9714a | 477 | { |
b0d3ded1 TM |
478 | if (test_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) |
479 | nfs4_schedule_state_manager(clp); | |
58d9714a TM |
480 | } |
481 | ||
d3978bb3 CL |
482 | /** |
483 | * nfs_expire_all_delegation_types | |
484 | * @clp: client to process | |
485 | * @flags: delegation types to expire | |
486 | * | |
487 | */ | |
31f09607 | 488 | void nfs_expire_all_delegation_types(struct nfs_client *clp, fmode_t flags) |
58d9714a | 489 | { |
c79571a5 | 490 | nfs_client_mark_return_all_delegation_types(clp, flags); |
b0d3ded1 | 491 | nfs_delegation_run_state_manager(clp); |
58d9714a TM |
492 | } |
493 | ||
d3978bb3 CL |
494 | /** |
495 | * nfs_expire_all_delegations | |
496 | * @clp: client to process | |
497 | * | |
498 | */ | |
c79571a5 AB |
499 | void nfs_expire_all_delegations(struct nfs_client *clp) |
500 | { | |
501 | nfs_expire_all_delegation_types(clp, FMODE_READ|FMODE_WRITE); | |
502 | } | |
503 | ||
d3978bb3 CL |
504 | /** |
505 | * nfs_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN | |
506 | * @clp: client to process | |
507 | * | |
1da177e4 | 508 | */ |
adfa6f98 | 509 | void nfs_handle_cb_pathdown(struct nfs_client *clp) |
1da177e4 | 510 | { |
1da177e4 LT |
511 | if (clp == NULL) |
512 | return; | |
707fb4b3 | 513 | nfs_client_mark_return_all_delegations(clp); |
1da177e4 LT |
514 | } |
515 | ||
d3978bb3 | 516 | static void nfs_mark_return_unreferenced_delegations(struct nfs_server *server) |
b7391f44 TM |
517 | { |
518 | struct nfs_delegation *delegation; | |
519 | ||
d3978bb3 | 520 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { |
b7391f44 TM |
521 | if (test_and_clear_bit(NFS_DELEGATION_REFERENCED, &delegation->flags)) |
522 | continue; | |
d3978bb3 | 523 | nfs_mark_return_delegation(delegation); |
b7391f44 | 524 | } |
b7391f44 TM |
525 | } |
526 | ||
d3978bb3 CL |
527 | /** |
528 | * nfs_expire_unreferenced_delegations - Eliminate unused delegations | |
529 | * @clp: nfs_client to process | |
530 | * | |
531 | */ | |
b7391f44 TM |
532 | void nfs_expire_unreferenced_delegations(struct nfs_client *clp) |
533 | { | |
d3978bb3 CL |
534 | struct nfs_server *server; |
535 | ||
536 | rcu_read_lock(); | |
537 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
538 | nfs_mark_return_unreferenced_delegations(server); | |
539 | rcu_read_unlock(); | |
540 | ||
b7391f44 TM |
541 | nfs_delegation_run_state_manager(clp); |
542 | } | |
543 | ||
d3978bb3 CL |
544 | /** |
545 | * nfs_async_inode_return_delegation - asynchronously return a delegation | |
546 | * @inode: inode to process | |
547 | * @stateid: state ID information from CB_RECALL arguments | |
548 | * | |
549 | * Returns zero on success, or a negative errno value. | |
1da177e4 | 550 | */ |
d3978bb3 CL |
551 | int nfs_async_inode_return_delegation(struct inode *inode, |
552 | const nfs4_stateid *stateid) | |
1da177e4 | 553 | { |
6411bd4a TM |
554 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; |
555 | struct nfs_delegation *delegation; | |
1da177e4 | 556 | |
6411bd4a TM |
557 | rcu_read_lock(); |
558 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
2597641d | 559 | |
e047a10c | 560 | if (!clp->cl_mvops->validate_stateid(delegation, stateid)) { |
6411bd4a TM |
561 | rcu_read_unlock(); |
562 | return -ENOENT; | |
563 | } | |
d3978bb3 | 564 | nfs_mark_return_delegation(delegation); |
6411bd4a | 565 | rcu_read_unlock(); |
d3978bb3 | 566 | |
6411bd4a TM |
567 | nfs_delegation_run_state_manager(clp); |
568 | return 0; | |
1da177e4 LT |
569 | } |
570 | ||
d3978bb3 CL |
571 | static struct inode * |
572 | nfs_delegation_find_inode_server(struct nfs_server *server, | |
573 | const struct nfs_fh *fhandle) | |
1da177e4 LT |
574 | { |
575 | struct nfs_delegation *delegation; | |
576 | struct inode *res = NULL; | |
d3978bb3 CL |
577 | |
578 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { | |
86e89489 TM |
579 | spin_lock(&delegation->lock); |
580 | if (delegation->inode != NULL && | |
581 | nfs_compare_fh(fhandle, &NFS_I(delegation->inode)->fh) == 0) { | |
1da177e4 | 582 | res = igrab(delegation->inode); |
1da177e4 | 583 | } |
86e89489 TM |
584 | spin_unlock(&delegation->lock); |
585 | if (res != NULL) | |
586 | break; | |
1da177e4 | 587 | } |
d3978bb3 CL |
588 | return res; |
589 | } | |
590 | ||
591 | /** | |
592 | * nfs_delegation_find_inode - retrieve the inode associated with a delegation | |
593 | * @clp: client state handle | |
594 | * @fhandle: filehandle from a delegation recall | |
595 | * | |
596 | * Returns pointer to inode matching "fhandle," or NULL if a matching inode | |
597 | * cannot be found. | |
598 | */ | |
599 | struct inode *nfs_delegation_find_inode(struct nfs_client *clp, | |
600 | const struct nfs_fh *fhandle) | |
601 | { | |
602 | struct nfs_server *server; | |
603 | struct inode *res = NULL; | |
604 | ||
605 | rcu_read_lock(); | |
606 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { | |
607 | res = nfs_delegation_find_inode_server(server, fhandle); | |
608 | if (res != NULL) | |
609 | break; | |
610 | } | |
8383e460 | 611 | rcu_read_unlock(); |
1da177e4 LT |
612 | return res; |
613 | } | |
614 | ||
d3978bb3 CL |
615 | static void nfs_delegation_mark_reclaim_server(struct nfs_server *server) |
616 | { | |
617 | struct nfs_delegation *delegation; | |
618 | ||
619 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) | |
620 | set_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags); | |
621 | } | |
622 | ||
623 | /** | |
624 | * nfs_delegation_mark_reclaim - mark all delegations as needing to be reclaimed | |
625 | * @clp: nfs_client to process | |
626 | * | |
1da177e4 | 627 | */ |
adfa6f98 | 628 | void nfs_delegation_mark_reclaim(struct nfs_client *clp) |
1da177e4 | 629 | { |
d3978bb3 CL |
630 | struct nfs_server *server; |
631 | ||
8383e460 | 632 | rcu_read_lock(); |
d3978bb3 CL |
633 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) |
634 | nfs_delegation_mark_reclaim_server(server); | |
8383e460 | 635 | rcu_read_unlock(); |
1da177e4 LT |
636 | } |
637 | ||
d3978bb3 CL |
638 | /** |
639 | * nfs_delegation_reap_unclaimed - reap unclaimed delegations after reboot recovery is done | |
640 | * @clp: nfs_client to process | |
641 | * | |
1da177e4 | 642 | */ |
adfa6f98 | 643 | void nfs_delegation_reap_unclaimed(struct nfs_client *clp) |
1da177e4 | 644 | { |
8383e460 | 645 | struct nfs_delegation *delegation; |
d3978bb3 | 646 | struct nfs_server *server; |
86e89489 | 647 | struct inode *inode; |
d3978bb3 | 648 | |
8383e460 TM |
649 | restart: |
650 | rcu_read_lock(); | |
d3978bb3 CL |
651 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { |
652 | list_for_each_entry_rcu(delegation, &server->delegations, | |
653 | super_list) { | |
654 | if (test_bit(NFS_DELEGATION_NEED_RECLAIM, | |
655 | &delegation->flags) == 0) | |
656 | continue; | |
657 | inode = nfs_delegation_grab_inode(delegation); | |
658 | if (inode == NULL) | |
659 | continue; | |
660 | delegation = nfs_detach_delegation(NFS_I(inode), | |
661 | server); | |
662 | rcu_read_unlock(); | |
663 | ||
664 | if (delegation != NULL) | |
665 | nfs_free_delegation(delegation); | |
666 | iput(inode); | |
667 | goto restart; | |
668 | } | |
1da177e4 | 669 | } |
8383e460 | 670 | rcu_read_unlock(); |
1da177e4 | 671 | } |
3e4f6290 | 672 | |
d3978bb3 CL |
673 | /** |
674 | * nfs_delegations_present - check for existence of delegations | |
675 | * @clp: client state handle | |
676 | * | |
677 | * Returns one if there are any nfs_delegation structures attached | |
678 | * to this nfs_client. | |
679 | */ | |
680 | int nfs_delegations_present(struct nfs_client *clp) | |
681 | { | |
682 | struct nfs_server *server; | |
683 | int ret = 0; | |
684 | ||
685 | rcu_read_lock(); | |
686 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
687 | if (!list_empty(&server->delegations)) { | |
688 | ret = 1; | |
689 | break; | |
690 | } | |
691 | rcu_read_unlock(); | |
692 | return ret; | |
693 | } | |
694 | ||
695 | /** | |
696 | * nfs4_copy_delegation_stateid - Copy inode's state ID information | |
697 | * @dst: stateid data structure to fill in | |
698 | * @inode: inode to check | |
699 | * | |
700 | * Returns one and fills in "dst->data" * if inode had a delegation, | |
701 | * otherwise zero is returned. | |
702 | */ | |
3e4f6290 TM |
703 | int nfs4_copy_delegation_stateid(nfs4_stateid *dst, struct inode *inode) |
704 | { | |
3e4f6290 TM |
705 | struct nfs_inode *nfsi = NFS_I(inode); |
706 | struct nfs_delegation *delegation; | |
8383e460 | 707 | int ret = 0; |
3e4f6290 | 708 | |
8383e460 TM |
709 | rcu_read_lock(); |
710 | delegation = rcu_dereference(nfsi->delegation); | |
3e4f6290 TM |
711 | if (delegation != NULL) { |
712 | memcpy(dst->data, delegation->stateid.data, sizeof(dst->data)); | |
8383e460 | 713 | ret = 1; |
3e4f6290 | 714 | } |
8383e460 TM |
715 | rcu_read_unlock(); |
716 | return ret; | |
3e4f6290 | 717 | } |