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 TM |
24 | static void nfs_free_delegation(struct nfs_delegation *delegation) |
25 | { | |
e00b8a24 TM |
26 | if (delegation->cred) { |
27 | put_rpccred(delegation->cred); | |
28 | delegation->cred = NULL; | |
29 | } | |
26f04dde | 30 | kfree_rcu(delegation, rcu); |
8383e460 TM |
31 | } |
32 | ||
d3978bb3 CL |
33 | /** |
34 | * nfs_mark_delegation_referenced - set delegation's REFERENCED flag | |
35 | * @delegation: delegation to process | |
36 | * | |
37 | */ | |
b7391f44 TM |
38 | void nfs_mark_delegation_referenced(struct nfs_delegation *delegation) |
39 | { | |
40 | set_bit(NFS_DELEGATION_REFERENCED, &delegation->flags); | |
41 | } | |
42 | ||
d3978bb3 CL |
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 | */ | |
011e2a7f | 50 | int nfs4_have_delegation(struct inode *inode, fmode_t flags) |
b7391f44 TM |
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); | |
d25be546 TM |
58 | if (delegation != NULL && (delegation->type & flags) == flags && |
59 | !test_bit(NFS_DELEGATION_RETURNING, &delegation->flags)) { | |
b7391f44 TM |
60 | nfs_mark_delegation_referenced(delegation); |
61 | ret = 1; | |
62 | } | |
63 | rcu_read_unlock(); | |
64 | return ret; | |
65 | } | |
66 | ||
888e694c TM |
67 | static int nfs_delegation_claim_locks(struct nfs_open_context *ctx, struct nfs4_state *state) |
68 | { | |
69 | struct inode *inode = state->inode; | |
70 | struct file_lock *fl; | |
d5122201 | 71 | int status = 0; |
888e694c | 72 | |
3f09df70 TM |
73 | if (inode->i_flock == NULL) |
74 | goto out; | |
75 | ||
b89f4321 AB |
76 | /* Protect inode->i_flock using the file locks lock */ |
77 | lock_flocks(); | |
90dc7d27 | 78 | for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) { |
888e694c TM |
79 | if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK))) |
80 | continue; | |
cd3758e3 | 81 | if (nfs_file_open_context(fl->fl_file) != ctx) |
888e694c | 82 | continue; |
b89f4321 | 83 | unlock_flocks(); |
888e694c | 84 | status = nfs4_lock_delegation_recall(state, fl); |
d5122201 | 85 | if (status < 0) |
3f09df70 | 86 | goto out; |
b89f4321 | 87 | lock_flocks(); |
888e694c | 88 | } |
b89f4321 | 89 | unlock_flocks(); |
3f09df70 | 90 | out: |
888e694c TM |
91 | return status; |
92 | } | |
93 | ||
d18cc1fd | 94 | static int nfs_delegation_claim_opens(struct inode *inode, const nfs4_stateid *stateid) |
1da177e4 LT |
95 | { |
96 | struct nfs_inode *nfsi = NFS_I(inode); | |
97 | struct nfs_open_context *ctx; | |
d25be546 | 98 | struct nfs4_state_owner *sp; |
1da177e4 | 99 | struct nfs4_state *state; |
d25be546 | 100 | unsigned int seq; |
888e694c | 101 | int err; |
1da177e4 LT |
102 | |
103 | again: | |
104 | spin_lock(&inode->i_lock); | |
105 | list_for_each_entry(ctx, &nfsi->open_files, list) { | |
106 | state = ctx->state; | |
107 | if (state == NULL) | |
108 | continue; | |
109 | if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) | |
110 | continue; | |
f597c537 | 111 | if (!nfs4_stateid_match(&state->stateid, stateid)) |
90163027 | 112 | continue; |
1da177e4 LT |
113 | get_nfs_open_context(ctx); |
114 | spin_unlock(&inode->i_lock); | |
d25be546 TM |
115 | sp = state->owner; |
116 | seq = raw_seqcount_begin(&sp->so_reclaim_seqcount); | |
13437e12 | 117 | err = nfs4_open_delegation_recall(ctx, state, stateid); |
d25be546 | 118 | if (!err) |
888e694c | 119 | err = nfs_delegation_claim_locks(ctx, state); |
d25be546 TM |
120 | if (!err && read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) |
121 | err = -EAGAIN; | |
1da177e4 | 122 | put_nfs_open_context(ctx); |
888e694c | 123 | if (err != 0) |
d18cc1fd | 124 | return err; |
1da177e4 LT |
125 | goto again; |
126 | } | |
127 | spin_unlock(&inode->i_lock); | |
d18cc1fd | 128 | return 0; |
1da177e4 LT |
129 | } |
130 | ||
d3978bb3 CL |
131 | /** |
132 | * nfs_inode_reclaim_delegation - process a delegation reclaim request | |
133 | * @inode: inode to process | |
134 | * @cred: credential to use for request | |
135 | * @res: new delegation state from server | |
136 | * | |
1da177e4 | 137 | */ |
d3978bb3 CL |
138 | void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, |
139 | struct nfs_openres *res) | |
1da177e4 | 140 | { |
8f649c37 TM |
141 | struct nfs_delegation *delegation; |
142 | struct rpc_cred *oldcred = NULL; | |
1da177e4 | 143 | |
8f649c37 TM |
144 | rcu_read_lock(); |
145 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
146 | if (delegation != NULL) { | |
147 | spin_lock(&delegation->lock); | |
148 | if (delegation->inode != NULL) { | |
f597c537 | 149 | nfs4_stateid_copy(&delegation->stateid, &res->delegation); |
8f649c37 TM |
150 | delegation->type = res->delegation_type; |
151 | delegation->maxsize = res->maxsize; | |
152 | oldcred = delegation->cred; | |
153 | delegation->cred = get_rpccred(cred); | |
154 | clear_bit(NFS_DELEGATION_NEED_RECLAIM, | |
155 | &delegation->flags); | |
156 | NFS_I(inode)->delegation_state = delegation->type; | |
157 | spin_unlock(&delegation->lock); | |
158 | put_rpccred(oldcred); | |
159 | rcu_read_unlock(); | |
160 | } else { | |
161 | /* We appear to have raced with a delegation return. */ | |
162 | spin_unlock(&delegation->lock); | |
163 | rcu_read_unlock(); | |
164 | nfs_inode_set_delegation(inode, cred, res); | |
165 | } | |
166 | } else { | |
167 | rcu_read_unlock(); | |
168 | } | |
1da177e4 LT |
169 | } |
170 | ||
57bfa891 TM |
171 | static int nfs_do_return_delegation(struct inode *inode, struct nfs_delegation *delegation, int issync) |
172 | { | |
173 | int res = 0; | |
174 | ||
175 | res = nfs4_proc_delegreturn(inode, delegation->cred, &delegation->stateid, issync); | |
176 | nfs_free_delegation(delegation); | |
177 | return res; | |
178 | } | |
179 | ||
86e89489 TM |
180 | static struct inode *nfs_delegation_grab_inode(struct nfs_delegation *delegation) |
181 | { | |
182 | struct inode *inode = NULL; | |
183 | ||
184 | spin_lock(&delegation->lock); | |
185 | if (delegation->inode != NULL) | |
186 | inode = igrab(delegation->inode); | |
187 | spin_unlock(&delegation->lock); | |
188 | return inode; | |
189 | } | |
190 | ||
d25be546 TM |
191 | static struct nfs_delegation * |
192 | nfs_start_delegation_return_locked(struct nfs_inode *nfsi) | |
193 | { | |
194 | struct nfs_delegation *ret = NULL; | |
195 | struct nfs_delegation *delegation = rcu_dereference(nfsi->delegation); | |
196 | ||
197 | if (delegation == NULL) | |
198 | goto out; | |
199 | spin_lock(&delegation->lock); | |
200 | if (!test_and_set_bit(NFS_DELEGATION_RETURNING, &delegation->flags)) | |
201 | ret = delegation; | |
202 | spin_unlock(&delegation->lock); | |
203 | out: | |
204 | return ret; | |
205 | } | |
206 | ||
207 | static struct nfs_delegation * | |
208 | nfs_start_delegation_return(struct nfs_inode *nfsi) | |
209 | { | |
210 | struct nfs_delegation *delegation; | |
211 | ||
212 | rcu_read_lock(); | |
213 | delegation = nfs_start_delegation_return_locked(nfsi); | |
214 | rcu_read_unlock(); | |
215 | return delegation; | |
216 | } | |
217 | ||
218 | static void | |
219 | nfs_abort_delegation_return(struct nfs_delegation *delegation, | |
220 | struct nfs_client *clp) | |
221 | { | |
222 | ||
223 | spin_lock(&delegation->lock); | |
224 | clear_bit(NFS_DELEGATION_RETURNING, &delegation->flags); | |
225 | set_bit(NFS_DELEGATION_RETURN, &delegation->flags); | |
226 | spin_unlock(&delegation->lock); | |
227 | set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state); | |
228 | } | |
229 | ||
dda4b225 CL |
230 | static struct nfs_delegation * |
231 | nfs_detach_delegation_locked(struct nfs_inode *nfsi, | |
d25be546 TM |
232 | struct nfs_delegation *delegation, |
233 | struct nfs_client *clp) | |
57bfa891 | 234 | { |
d25be546 | 235 | struct nfs_delegation *deleg_cur = |
17d2c0a0 | 236 | rcu_dereference_protected(nfsi->delegation, |
d25be546 | 237 | lockdep_is_held(&clp->cl_lock)); |
57bfa891 | 238 | |
d25be546 TM |
239 | if (deleg_cur == NULL || delegation != deleg_cur) |
240 | return NULL; | |
dda4b225 | 241 | |
34310430 | 242 | spin_lock(&delegation->lock); |
d25be546 | 243 | set_bit(NFS_DELEGATION_RETURNING, &delegation->flags); |
57bfa891 | 244 | list_del_rcu(&delegation->super_list); |
86e89489 | 245 | delegation->inode = NULL; |
57bfa891 TM |
246 | nfsi->delegation_state = 0; |
247 | rcu_assign_pointer(nfsi->delegation, NULL); | |
34310430 | 248 | spin_unlock(&delegation->lock); |
57bfa891 | 249 | return delegation; |
57bfa891 TM |
250 | } |
251 | ||
dda4b225 | 252 | static struct nfs_delegation *nfs_detach_delegation(struct nfs_inode *nfsi, |
d25be546 TM |
253 | struct nfs_delegation *delegation, |
254 | struct nfs_server *server) | |
dda4b225 | 255 | { |
d3978bb3 | 256 | struct nfs_client *clp = server->nfs_client; |
dda4b225 CL |
257 | |
258 | spin_lock(&clp->cl_lock); | |
d25be546 | 259 | delegation = nfs_detach_delegation_locked(nfsi, delegation, clp); |
dda4b225 CL |
260 | spin_unlock(&clp->cl_lock); |
261 | return delegation; | |
262 | } | |
263 | ||
d25be546 TM |
264 | static struct nfs_delegation * |
265 | nfs_inode_detach_delegation(struct inode *inode) | |
266 | { | |
267 | struct nfs_inode *nfsi = NFS_I(inode); | |
268 | struct nfs_server *server = NFS_SERVER(inode); | |
269 | struct nfs_delegation *delegation; | |
270 | ||
271 | delegation = nfs_start_delegation_return(nfsi); | |
272 | if (delegation == NULL) | |
273 | return NULL; | |
274 | return nfs_detach_delegation(nfsi, delegation, server); | |
275 | } | |
276 | ||
d3978bb3 CL |
277 | /** |
278 | * nfs_inode_set_delegation - set up a delegation on an inode | |
279 | * @inode: inode to which delegation applies | |
280 | * @cred: cred to use for subsequent delegation processing | |
281 | * @res: new delegation state from server | |
282 | * | |
283 | * Returns zero on success, or a negative errno value. | |
1da177e4 LT |
284 | */ |
285 | int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res) | |
286 | { | |
d3978bb3 CL |
287 | struct nfs_server *server = NFS_SERVER(inode); |
288 | struct nfs_client *clp = server->nfs_client; | |
1da177e4 | 289 | struct nfs_inode *nfsi = NFS_I(inode); |
17d2c0a0 | 290 | struct nfs_delegation *delegation, *old_delegation; |
57bfa891 | 291 | struct nfs_delegation *freeme = NULL; |
1da177e4 LT |
292 | int status = 0; |
293 | ||
8535b2be | 294 | delegation = kmalloc(sizeof(*delegation), GFP_NOFS); |
1da177e4 LT |
295 | if (delegation == NULL) |
296 | return -ENOMEM; | |
f597c537 | 297 | nfs4_stateid_copy(&delegation->stateid, &res->delegation); |
1da177e4 LT |
298 | delegation->type = res->delegation_type; |
299 | delegation->maxsize = res->maxsize; | |
a9a4a87a | 300 | delegation->change_attr = inode->i_version; |
1da177e4 LT |
301 | delegation->cred = get_rpccred(cred); |
302 | delegation->inode = inode; | |
b7391f44 | 303 | delegation->flags = 1<<NFS_DELEGATION_REFERENCED; |
34310430 | 304 | spin_lock_init(&delegation->lock); |
1da177e4 LT |
305 | |
306 | spin_lock(&clp->cl_lock); | |
17d2c0a0 | 307 | old_delegation = rcu_dereference_protected(nfsi->delegation, |
d3978bb3 | 308 | lockdep_is_held(&clp->cl_lock)); |
17d2c0a0 | 309 | if (old_delegation != NULL) { |
f597c537 TM |
310 | if (nfs4_stateid_match(&delegation->stateid, |
311 | &old_delegation->stateid) && | |
17d2c0a0 | 312 | delegation->type == old_delegation->type) { |
57bfa891 | 313 | goto out; |
1da177e4 | 314 | } |
57bfa891 TM |
315 | /* |
316 | * Deal with broken servers that hand out two | |
317 | * delegations for the same file. | |
17280175 TM |
318 | * Allow for upgrades to a WRITE delegation, but |
319 | * nothing else. | |
57bfa891 TM |
320 | */ |
321 | dfprintk(FILE, "%s: server %s handed out " | |
322 | "a duplicate delegation!\n", | |
3110ff80 | 323 | __func__, clp->cl_hostname); |
17280175 TM |
324 | if (delegation->type == old_delegation->type || |
325 | !(delegation->type & FMODE_WRITE)) { | |
57bfa891 TM |
326 | freeme = delegation; |
327 | delegation = NULL; | |
328 | goto out; | |
329 | } | |
d25be546 TM |
330 | freeme = nfs_detach_delegation_locked(nfsi, |
331 | old_delegation, clp); | |
332 | if (freeme == NULL) | |
333 | goto out; | |
1da177e4 | 334 | } |
d3978bb3 | 335 | list_add_rcu(&delegation->super_list, &server->delegations); |
57bfa891 TM |
336 | nfsi->delegation_state = delegation->type; |
337 | rcu_assign_pointer(nfsi->delegation, delegation); | |
338 | delegation = NULL; | |
412c77ce TM |
339 | |
340 | /* Ensure we revalidate the attributes and page cache! */ | |
341 | spin_lock(&inode->i_lock); | |
342 | nfsi->cache_validity |= NFS_INO_REVAL_FORCED; | |
343 | spin_unlock(&inode->i_lock); | |
344 | ||
57bfa891 | 345 | out: |
1da177e4 | 346 | spin_unlock(&clp->cl_lock); |
603c83da TM |
347 | if (delegation != NULL) |
348 | nfs_free_delegation(delegation); | |
57bfa891 TM |
349 | if (freeme != NULL) |
350 | nfs_do_return_delegation(inode, freeme, 0); | |
1da177e4 LT |
351 | return status; |
352 | } | |
353 | ||
1da177e4 LT |
354 | /* |
355 | * Basic procedure for returning a delegation to the server | |
356 | */ | |
d25be546 | 357 | static int nfs_end_delegation_return(struct inode *inode, struct nfs_delegation *delegation, int issync) |
1da177e4 | 358 | { |
d25be546 | 359 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; |
1da177e4 | 360 | struct nfs_inode *nfsi = NFS_I(inode); |
d18cc1fd | 361 | int err; |
1da177e4 | 362 | |
d25be546 TM |
363 | if (delegation == NULL) |
364 | return 0; | |
365 | do { | |
366 | err = nfs_delegation_claim_opens(inode, &delegation->stateid); | |
367 | if (!issync || err != -EAGAIN) | |
368 | break; | |
369 | /* | |
370 | * Guard against state recovery | |
371 | */ | |
372 | err = nfs4_wait_clnt_recover(clp); | |
373 | } while (err == 0); | |
374 | ||
375 | if (err) { | |
376 | nfs_abort_delegation_return(delegation, clp); | |
377 | goto out; | |
378 | } | |
379 | if (!nfs_detach_delegation(nfsi, delegation, NFS_SERVER(inode))) | |
d18cc1fd | 380 | goto out; |
1da177e4 | 381 | |
d18cc1fd TM |
382 | err = nfs_do_return_delegation(inode, delegation, issync); |
383 | out: | |
384 | return err; | |
90163027 TM |
385 | } |
386 | ||
d3978bb3 CL |
387 | /** |
388 | * nfs_client_return_marked_delegations - return previously marked delegations | |
389 | * @clp: nfs_client to process | |
390 | * | |
dc327ed4 TM |
391 | * Note that this function is designed to be called by the state |
392 | * manager thread. For this reason, it cannot flush the dirty data, | |
393 | * since that could deadlock in case of a state recovery error. | |
394 | * | |
d3978bb3 | 395 | * Returns zero on success, or a negative errno value. |
515d8611 | 396 | */ |
d18cc1fd | 397 | int nfs_client_return_marked_delegations(struct nfs_client *clp) |
515d8611 TM |
398 | { |
399 | struct nfs_delegation *delegation; | |
d3978bb3 | 400 | struct nfs_server *server; |
515d8611 | 401 | struct inode *inode; |
d18cc1fd | 402 | int err = 0; |
515d8611 TM |
403 | |
404 | restart: | |
405 | rcu_read_lock(); | |
d3978bb3 CL |
406 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { |
407 | list_for_each_entry_rcu(delegation, &server->delegations, | |
408 | super_list) { | |
409 | if (!test_and_clear_bit(NFS_DELEGATION_RETURN, | |
410 | &delegation->flags)) | |
411 | continue; | |
412 | inode = nfs_delegation_grab_inode(delegation); | |
413 | if (inode == NULL) | |
414 | continue; | |
d25be546 | 415 | delegation = nfs_start_delegation_return_locked(NFS_I(inode)); |
d3978bb3 CL |
416 | rcu_read_unlock(); |
417 | ||
d25be546 | 418 | err = nfs_end_delegation_return(inode, delegation, 0); |
d3978bb3 CL |
419 | iput(inode); |
420 | if (!err) | |
421 | goto restart; | |
422 | set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state); | |
423 | return err; | |
d18cc1fd | 424 | } |
515d8611 TM |
425 | } |
426 | rcu_read_unlock(); | |
d18cc1fd | 427 | return 0; |
515d8611 TM |
428 | } |
429 | ||
d3978bb3 CL |
430 | /** |
431 | * nfs_inode_return_delegation_noreclaim - return delegation, don't reclaim opens | |
432 | * @inode: inode to process | |
433 | * | |
434 | * Does not protect against delegation reclaims, therefore really only safe | |
435 | * to be called from nfs4_clear_inode(). | |
e6f81075 TM |
436 | */ |
437 | void nfs_inode_return_delegation_noreclaim(struct inode *inode) | |
438 | { | |
e6f81075 TM |
439 | struct nfs_delegation *delegation; |
440 | ||
d25be546 TM |
441 | delegation = nfs_inode_detach_delegation(inode); |
442 | if (delegation != NULL) | |
443 | nfs_do_return_delegation(inode, delegation, 0); | |
e6f81075 TM |
444 | } |
445 | ||
d3978bb3 CL |
446 | /** |
447 | * nfs_inode_return_delegation - synchronously return a delegation | |
448 | * @inode: inode to process | |
449 | * | |
c57d1bc5 TM |
450 | * This routine will always flush any dirty data to disk on the |
451 | * assumption that if we need to return the delegation, then | |
452 | * we should stop caching. | |
453 | * | |
d3978bb3 CL |
454 | * Returns zero on success, or a negative errno value. |
455 | */ | |
57ec14c5 | 456 | int nfs4_inode_return_delegation(struct inode *inode) |
90163027 | 457 | { |
90163027 TM |
458 | struct nfs_inode *nfsi = NFS_I(inode); |
459 | struct nfs_delegation *delegation; | |
460 | int err = 0; | |
461 | ||
c57d1bc5 | 462 | nfs_wb_all(inode); |
d25be546 TM |
463 | delegation = nfs_start_delegation_return(nfsi); |
464 | if (delegation != NULL) | |
465 | err = nfs_end_delegation_return(inode, delegation, 1); | |
90163027 | 466 | return err; |
1da177e4 LT |
467 | } |
468 | ||
ed1e6211 TM |
469 | static void nfs_mark_return_delegation(struct nfs_server *server, |
470 | struct nfs_delegation *delegation) | |
6411bd4a TM |
471 | { |
472 | set_bit(NFS_DELEGATION_RETURN, &delegation->flags); | |
ed1e6211 | 473 | set_bit(NFS4CLNT_DELEGRETURN, &server->nfs_client->cl_state); |
6411bd4a TM |
474 | } |
475 | ||
d3978bb3 CL |
476 | /** |
477 | * nfs_super_return_all_delegations - return delegations for one superblock | |
478 | * @sb: sb to process | |
479 | * | |
1da177e4 | 480 | */ |
eeebf916 | 481 | void nfs_server_return_all_delegations(struct nfs_server *server) |
1da177e4 | 482 | { |
d3978bb3 | 483 | struct nfs_client *clp = server->nfs_client; |
1da177e4 | 484 | struct nfs_delegation *delegation; |
1da177e4 LT |
485 | |
486 | if (clp == NULL) | |
487 | return; | |
d3978bb3 | 488 | |
8383e460 | 489 | rcu_read_lock(); |
d3978bb3 | 490 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { |
86e89489 | 491 | spin_lock(&delegation->lock); |
d3978bb3 | 492 | set_bit(NFS_DELEGATION_RETURN, &delegation->flags); |
86e89489 | 493 | spin_unlock(&delegation->lock); |
1da177e4 | 494 | } |
8383e460 | 495 | rcu_read_unlock(); |
d3978bb3 | 496 | |
d18cc1fd TM |
497 | if (nfs_client_return_marked_delegations(clp) != 0) |
498 | nfs4_schedule_state_manager(clp); | |
515d8611 TM |
499 | } |
500 | ||
d3978bb3 CL |
501 | static void nfs_mark_return_all_delegation_types(struct nfs_server *server, |
502 | fmode_t flags) | |
515d8611 TM |
503 | { |
504 | struct nfs_delegation *delegation; | |
505 | ||
d3978bb3 | 506 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { |
c79571a5 AB |
507 | if ((delegation->type == (FMODE_READ|FMODE_WRITE)) && !(flags & FMODE_WRITE)) |
508 | continue; | |
509 | if (delegation->type & flags) | |
ed1e6211 | 510 | nfs_mark_return_delegation(server, delegation); |
707fb4b3 | 511 | } |
d3978bb3 CL |
512 | } |
513 | ||
514 | static void nfs_client_mark_return_all_delegation_types(struct nfs_client *clp, | |
515 | fmode_t flags) | |
516 | { | |
517 | struct nfs_server *server; | |
518 | ||
519 | rcu_read_lock(); | |
520 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
521 | nfs_mark_return_all_delegation_types(server, flags); | |
515d8611 | 522 | rcu_read_unlock(); |
1da177e4 LT |
523 | } |
524 | ||
b0d3ded1 | 525 | static void nfs_delegation_run_state_manager(struct nfs_client *clp) |
58d9714a | 526 | { |
b0d3ded1 TM |
527 | if (test_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) |
528 | nfs4_schedule_state_manager(clp); | |
58d9714a TM |
529 | } |
530 | ||
a1d0b5ee TM |
531 | void nfs_remove_bad_delegation(struct inode *inode) |
532 | { | |
533 | struct nfs_delegation *delegation; | |
534 | ||
d25be546 | 535 | delegation = nfs_inode_detach_delegation(inode); |
a1d0b5ee TM |
536 | if (delegation) { |
537 | nfs_inode_find_state_and_recover(inode, &delegation->stateid); | |
538 | nfs_free_delegation(delegation); | |
539 | } | |
540 | } | |
9cb81968 | 541 | EXPORT_SYMBOL_GPL(nfs_remove_bad_delegation); |
a1d0b5ee | 542 | |
d3978bb3 CL |
543 | /** |
544 | * nfs_expire_all_delegation_types | |
545 | * @clp: client to process | |
546 | * @flags: delegation types to expire | |
547 | * | |
548 | */ | |
31f09607 | 549 | void nfs_expire_all_delegation_types(struct nfs_client *clp, fmode_t flags) |
58d9714a | 550 | { |
c79571a5 | 551 | nfs_client_mark_return_all_delegation_types(clp, flags); |
b0d3ded1 | 552 | nfs_delegation_run_state_manager(clp); |
58d9714a TM |
553 | } |
554 | ||
d3978bb3 CL |
555 | /** |
556 | * nfs_expire_all_delegations | |
557 | * @clp: client to process | |
558 | * | |
559 | */ | |
c79571a5 AB |
560 | void nfs_expire_all_delegations(struct nfs_client *clp) |
561 | { | |
562 | nfs_expire_all_delegation_types(clp, FMODE_READ|FMODE_WRITE); | |
563 | } | |
564 | ||
d3978bb3 | 565 | static void nfs_mark_return_unreferenced_delegations(struct nfs_server *server) |
b7391f44 TM |
566 | { |
567 | struct nfs_delegation *delegation; | |
568 | ||
d3978bb3 | 569 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { |
b7391f44 TM |
570 | if (test_and_clear_bit(NFS_DELEGATION_REFERENCED, &delegation->flags)) |
571 | continue; | |
ed1e6211 | 572 | nfs_mark_return_delegation(server, delegation); |
b7391f44 | 573 | } |
b7391f44 TM |
574 | } |
575 | ||
d3978bb3 CL |
576 | /** |
577 | * nfs_expire_unreferenced_delegations - Eliminate unused delegations | |
578 | * @clp: nfs_client to process | |
579 | * | |
580 | */ | |
b7391f44 TM |
581 | void nfs_expire_unreferenced_delegations(struct nfs_client *clp) |
582 | { | |
d3978bb3 CL |
583 | struct nfs_server *server; |
584 | ||
585 | rcu_read_lock(); | |
586 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
587 | nfs_mark_return_unreferenced_delegations(server); | |
588 | rcu_read_unlock(); | |
589 | ||
b7391f44 TM |
590 | nfs_delegation_run_state_manager(clp); |
591 | } | |
592 | ||
d3978bb3 CL |
593 | /** |
594 | * nfs_async_inode_return_delegation - asynchronously return a delegation | |
595 | * @inode: inode to process | |
8e663f0e | 596 | * @stateid: state ID information |
d3978bb3 CL |
597 | * |
598 | * Returns zero on success, or a negative errno value. | |
1da177e4 | 599 | */ |
d3978bb3 CL |
600 | int nfs_async_inode_return_delegation(struct inode *inode, |
601 | const nfs4_stateid *stateid) | |
1da177e4 | 602 | { |
ed1e6211 TM |
603 | struct nfs_server *server = NFS_SERVER(inode); |
604 | struct nfs_client *clp = server->nfs_client; | |
6411bd4a | 605 | struct nfs_delegation *delegation; |
1da177e4 | 606 | |
dc327ed4 TM |
607 | filemap_flush(inode->i_mapping); |
608 | ||
6411bd4a TM |
609 | rcu_read_lock(); |
610 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
2597641d | 611 | |
36281caa | 612 | if (!clp->cl_mvops->match_stateid(&delegation->stateid, stateid)) { |
6411bd4a TM |
613 | rcu_read_unlock(); |
614 | return -ENOENT; | |
615 | } | |
ed1e6211 | 616 | nfs_mark_return_delegation(server, delegation); |
6411bd4a | 617 | rcu_read_unlock(); |
d3978bb3 | 618 | |
6411bd4a TM |
619 | nfs_delegation_run_state_manager(clp); |
620 | return 0; | |
1da177e4 LT |
621 | } |
622 | ||
d3978bb3 CL |
623 | static struct inode * |
624 | nfs_delegation_find_inode_server(struct nfs_server *server, | |
625 | const struct nfs_fh *fhandle) | |
1da177e4 LT |
626 | { |
627 | struct nfs_delegation *delegation; | |
628 | struct inode *res = NULL; | |
d3978bb3 CL |
629 | |
630 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { | |
86e89489 TM |
631 | spin_lock(&delegation->lock); |
632 | if (delegation->inode != NULL && | |
633 | nfs_compare_fh(fhandle, &NFS_I(delegation->inode)->fh) == 0) { | |
1da177e4 | 634 | res = igrab(delegation->inode); |
1da177e4 | 635 | } |
86e89489 TM |
636 | spin_unlock(&delegation->lock); |
637 | if (res != NULL) | |
638 | break; | |
1da177e4 | 639 | } |
d3978bb3 CL |
640 | return res; |
641 | } | |
642 | ||
643 | /** | |
644 | * nfs_delegation_find_inode - retrieve the inode associated with a delegation | |
645 | * @clp: client state handle | |
646 | * @fhandle: filehandle from a delegation recall | |
647 | * | |
648 | * Returns pointer to inode matching "fhandle," or NULL if a matching inode | |
649 | * cannot be found. | |
650 | */ | |
651 | struct inode *nfs_delegation_find_inode(struct nfs_client *clp, | |
652 | const struct nfs_fh *fhandle) | |
653 | { | |
654 | struct nfs_server *server; | |
655 | struct inode *res = NULL; | |
656 | ||
657 | rcu_read_lock(); | |
658 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { | |
659 | res = nfs_delegation_find_inode_server(server, fhandle); | |
660 | if (res != NULL) | |
661 | break; | |
662 | } | |
8383e460 | 663 | rcu_read_unlock(); |
1da177e4 LT |
664 | return res; |
665 | } | |
666 | ||
d3978bb3 CL |
667 | static void nfs_delegation_mark_reclaim_server(struct nfs_server *server) |
668 | { | |
669 | struct nfs_delegation *delegation; | |
670 | ||
671 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) | |
672 | set_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags); | |
673 | } | |
674 | ||
675 | /** | |
676 | * nfs_delegation_mark_reclaim - mark all delegations as needing to be reclaimed | |
677 | * @clp: nfs_client to process | |
678 | * | |
1da177e4 | 679 | */ |
adfa6f98 | 680 | void nfs_delegation_mark_reclaim(struct nfs_client *clp) |
1da177e4 | 681 | { |
d3978bb3 CL |
682 | struct nfs_server *server; |
683 | ||
8383e460 | 684 | rcu_read_lock(); |
d3978bb3 CL |
685 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) |
686 | nfs_delegation_mark_reclaim_server(server); | |
8383e460 | 687 | rcu_read_unlock(); |
1da177e4 LT |
688 | } |
689 | ||
d3978bb3 CL |
690 | /** |
691 | * nfs_delegation_reap_unclaimed - reap unclaimed delegations after reboot recovery is done | |
692 | * @clp: nfs_client to process | |
693 | * | |
1da177e4 | 694 | */ |
adfa6f98 | 695 | void nfs_delegation_reap_unclaimed(struct nfs_client *clp) |
1da177e4 | 696 | { |
8383e460 | 697 | struct nfs_delegation *delegation; |
d3978bb3 | 698 | struct nfs_server *server; |
86e89489 | 699 | struct inode *inode; |
d3978bb3 | 700 | |
8383e460 TM |
701 | restart: |
702 | rcu_read_lock(); | |
d3978bb3 CL |
703 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { |
704 | list_for_each_entry_rcu(delegation, &server->delegations, | |
705 | super_list) { | |
706 | if (test_bit(NFS_DELEGATION_NEED_RECLAIM, | |
707 | &delegation->flags) == 0) | |
708 | continue; | |
709 | inode = nfs_delegation_grab_inode(delegation); | |
710 | if (inode == NULL) | |
711 | continue; | |
712 | delegation = nfs_detach_delegation(NFS_I(inode), | |
d25be546 | 713 | delegation, server); |
d3978bb3 CL |
714 | rcu_read_unlock(); |
715 | ||
716 | if (delegation != NULL) | |
717 | nfs_free_delegation(delegation); | |
718 | iput(inode); | |
719 | goto restart; | |
720 | } | |
1da177e4 | 721 | } |
8383e460 | 722 | rcu_read_unlock(); |
1da177e4 | 723 | } |
3e4f6290 | 724 | |
d3978bb3 CL |
725 | /** |
726 | * nfs_delegations_present - check for existence of delegations | |
727 | * @clp: client state handle | |
728 | * | |
729 | * Returns one if there are any nfs_delegation structures attached | |
730 | * to this nfs_client. | |
731 | */ | |
732 | int nfs_delegations_present(struct nfs_client *clp) | |
733 | { | |
734 | struct nfs_server *server; | |
735 | int ret = 0; | |
736 | ||
737 | rcu_read_lock(); | |
738 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
739 | if (!list_empty(&server->delegations)) { | |
740 | ret = 1; | |
741 | break; | |
742 | } | |
743 | rcu_read_unlock(); | |
744 | return ret; | |
745 | } | |
746 | ||
747 | /** | |
748 | * nfs4_copy_delegation_stateid - Copy inode's state ID information | |
749 | * @dst: stateid data structure to fill in | |
750 | * @inode: inode to check | |
0032a7a7 | 751 | * @flags: delegation type requirement |
d3978bb3 | 752 | * |
0032a7a7 TM |
753 | * Returns "true" and fills in "dst->data" * if inode had a delegation, |
754 | * otherwise "false" is returned. | |
d3978bb3 | 755 | */ |
0032a7a7 TM |
756 | bool nfs4_copy_delegation_stateid(nfs4_stateid *dst, struct inode *inode, |
757 | fmode_t flags) | |
3e4f6290 | 758 | { |
3e4f6290 TM |
759 | struct nfs_inode *nfsi = NFS_I(inode); |
760 | struct nfs_delegation *delegation; | |
0032a7a7 | 761 | bool ret; |
3e4f6290 | 762 | |
0032a7a7 | 763 | flags &= FMODE_READ|FMODE_WRITE; |
8383e460 TM |
764 | rcu_read_lock(); |
765 | delegation = rcu_dereference(nfsi->delegation); | |
0032a7a7 TM |
766 | ret = (delegation != NULL && (delegation->type & flags) == flags); |
767 | if (ret) { | |
f597c537 | 768 | nfs4_stateid_copy(dst, &delegation->stateid); |
0032a7a7 | 769 | nfs_mark_delegation_referenced(delegation); |
3e4f6290 | 770 | } |
8383e460 TM |
771 | rcu_read_unlock(); |
772 | return ret; | |
3e4f6290 | 773 | } |