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Commit | Line | Data |
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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" |
ca8acf8d | 23 | #include "nfs4trace.h" |
1da177e4 | 24 | |
905f8d16 TM |
25 | static void nfs_free_delegation(struct nfs_delegation *delegation) |
26 | { | |
e00b8a24 TM |
27 | if (delegation->cred) { |
28 | put_rpccred(delegation->cred); | |
29 | delegation->cred = NULL; | |
30 | } | |
26f04dde | 31 | kfree_rcu(delegation, rcu); |
8383e460 TM |
32 | } |
33 | ||
d3978bb3 CL |
34 | /** |
35 | * nfs_mark_delegation_referenced - set delegation's REFERENCED flag | |
36 | * @delegation: delegation to process | |
37 | * | |
38 | */ | |
b7391f44 TM |
39 | void nfs_mark_delegation_referenced(struct nfs_delegation *delegation) |
40 | { | |
41 | set_bit(NFS_DELEGATION_REFERENCED, &delegation->flags); | |
42 | } | |
43 | ||
15bb3afe PT |
44 | static int |
45 | nfs4_do_check_delegation(struct inode *inode, fmode_t flags, bool mark) | |
b7391f44 TM |
46 | { |
47 | struct nfs_delegation *delegation; | |
48 | int ret = 0; | |
49 | ||
50 | flags &= FMODE_READ|FMODE_WRITE; | |
51 | rcu_read_lock(); | |
52 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
d25be546 TM |
53 | if (delegation != NULL && (delegation->type & flags) == flags && |
54 | !test_bit(NFS_DELEGATION_RETURNING, &delegation->flags)) { | |
15bb3afe PT |
55 | if (mark) |
56 | nfs_mark_delegation_referenced(delegation); | |
b7391f44 TM |
57 | ret = 1; |
58 | } | |
59 | rcu_read_unlock(); | |
60 | return ret; | |
61 | } | |
15bb3afe PT |
62 | /** |
63 | * nfs_have_delegation - check if inode has a delegation, mark it | |
64 | * NFS_DELEGATION_REFERENCED if there is one. | |
65 | * @inode: inode to check | |
66 | * @flags: delegation types to check for | |
67 | * | |
68 | * Returns one if inode has the indicated delegation, otherwise zero. | |
69 | */ | |
70 | int nfs4_have_delegation(struct inode *inode, fmode_t flags) | |
71 | { | |
72 | return nfs4_do_check_delegation(inode, flags, true); | |
73 | } | |
74 | ||
75 | /* | |
76 | * nfs4_check_delegation - check if inode has a delegation, do not mark | |
77 | * NFS_DELEGATION_REFERENCED if it has one. | |
78 | */ | |
79 | int nfs4_check_delegation(struct inode *inode, fmode_t flags) | |
80 | { | |
81 | return nfs4_do_check_delegation(inode, flags, false); | |
82 | } | |
b7391f44 | 83 | |
db4f2e63 | 84 | static int nfs_delegation_claim_locks(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid) |
888e694c TM |
85 | { |
86 | struct inode *inode = state->inode; | |
87 | struct file_lock *fl; | |
bd61e0a9 JL |
88 | struct file_lock_context *flctx = inode->i_flctx; |
89 | struct list_head *list; | |
d5122201 | 90 | int status = 0; |
888e694c | 91 | |
bd61e0a9 | 92 | if (flctx == NULL) |
65b62a29 | 93 | goto out; |
314d7cc0 | 94 | |
bd61e0a9 | 95 | list = &flctx->flc_posix; |
6109c850 | 96 | spin_lock(&flctx->flc_lock); |
bd61e0a9 JL |
97 | restart: |
98 | list_for_each_entry(fl, list, fl_list) { | |
cd3758e3 | 99 | if (nfs_file_open_context(fl->fl_file) != ctx) |
888e694c | 100 | continue; |
6109c850 | 101 | spin_unlock(&flctx->flc_lock); |
db4f2e63 | 102 | status = nfs4_lock_delegation_recall(fl, state, stateid); |
d5122201 | 103 | if (status < 0) |
3f09df70 | 104 | goto out; |
6109c850 | 105 | spin_lock(&flctx->flc_lock); |
888e694c | 106 | } |
bd61e0a9 JL |
107 | if (list == &flctx->flc_posix) { |
108 | list = &flctx->flc_flock; | |
109 | goto restart; | |
5263e31e | 110 | } |
6109c850 | 111 | spin_unlock(&flctx->flc_lock); |
3f09df70 | 112 | out: |
888e694c TM |
113 | return status; |
114 | } | |
115 | ||
d18cc1fd | 116 | static int nfs_delegation_claim_opens(struct inode *inode, const nfs4_stateid *stateid) |
1da177e4 LT |
117 | { |
118 | struct nfs_inode *nfsi = NFS_I(inode); | |
119 | struct nfs_open_context *ctx; | |
d25be546 | 120 | struct nfs4_state_owner *sp; |
1da177e4 | 121 | struct nfs4_state *state; |
d25be546 | 122 | unsigned int seq; |
888e694c | 123 | int err; |
1da177e4 LT |
124 | |
125 | again: | |
126 | spin_lock(&inode->i_lock); | |
127 | list_for_each_entry(ctx, &nfsi->open_files, list) { | |
128 | state = ctx->state; | |
129 | if (state == NULL) | |
130 | continue; | |
131 | if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) | |
132 | continue; | |
f8ebf7a8 TM |
133 | if (!nfs4_valid_open_stateid(state)) |
134 | continue; | |
f597c537 | 135 | if (!nfs4_stateid_match(&state->stateid, stateid)) |
90163027 | 136 | continue; |
1da177e4 LT |
137 | get_nfs_open_context(ctx); |
138 | spin_unlock(&inode->i_lock); | |
d25be546 | 139 | sp = state->owner; |
65b62a29 TM |
140 | /* Block nfs4_proc_unlck */ |
141 | mutex_lock(&sp->so_delegreturn_mutex); | |
d25be546 | 142 | seq = raw_seqcount_begin(&sp->so_reclaim_seqcount); |
13437e12 | 143 | err = nfs4_open_delegation_recall(ctx, state, stateid); |
d25be546 | 144 | if (!err) |
db4f2e63 | 145 | err = nfs_delegation_claim_locks(ctx, state, stateid); |
d25be546 TM |
146 | if (!err && read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) |
147 | err = -EAGAIN; | |
65b62a29 | 148 | mutex_unlock(&sp->so_delegreturn_mutex); |
1da177e4 | 149 | put_nfs_open_context(ctx); |
888e694c | 150 | if (err != 0) |
d18cc1fd | 151 | return err; |
1da177e4 LT |
152 | goto again; |
153 | } | |
154 | spin_unlock(&inode->i_lock); | |
d18cc1fd | 155 | return 0; |
1da177e4 LT |
156 | } |
157 | ||
d3978bb3 CL |
158 | /** |
159 | * nfs_inode_reclaim_delegation - process a delegation reclaim request | |
160 | * @inode: inode to process | |
161 | * @cred: credential to use for request | |
162 | * @res: new delegation state from server | |
163 | * | |
1da177e4 | 164 | */ |
d3978bb3 CL |
165 | void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, |
166 | struct nfs_openres *res) | |
1da177e4 | 167 | { |
8f649c37 TM |
168 | struct nfs_delegation *delegation; |
169 | struct rpc_cred *oldcred = NULL; | |
1da177e4 | 170 | |
8f649c37 TM |
171 | rcu_read_lock(); |
172 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
173 | if (delegation != NULL) { | |
174 | spin_lock(&delegation->lock); | |
175 | if (delegation->inode != NULL) { | |
f597c537 | 176 | nfs4_stateid_copy(&delegation->stateid, &res->delegation); |
8f649c37 TM |
177 | delegation->type = res->delegation_type; |
178 | delegation->maxsize = res->maxsize; | |
179 | oldcred = delegation->cred; | |
180 | delegation->cred = get_rpccred(cred); | |
181 | clear_bit(NFS_DELEGATION_NEED_RECLAIM, | |
182 | &delegation->flags); | |
183 | NFS_I(inode)->delegation_state = delegation->type; | |
184 | spin_unlock(&delegation->lock); | |
185 | put_rpccred(oldcred); | |
186 | rcu_read_unlock(); | |
ca8acf8d | 187 | trace_nfs4_reclaim_delegation(inode, res->delegation_type); |
8f649c37 TM |
188 | } else { |
189 | /* We appear to have raced with a delegation return. */ | |
190 | spin_unlock(&delegation->lock); | |
191 | rcu_read_unlock(); | |
192 | nfs_inode_set_delegation(inode, cred, res); | |
193 | } | |
194 | } else { | |
195 | rcu_read_unlock(); | |
196 | } | |
1da177e4 LT |
197 | } |
198 | ||
57bfa891 TM |
199 | static int nfs_do_return_delegation(struct inode *inode, struct nfs_delegation *delegation, int issync) |
200 | { | |
201 | int res = 0; | |
202 | ||
869f9dfa TM |
203 | if (!test_bit(NFS_DELEGATION_REVOKED, &delegation->flags)) |
204 | res = nfs4_proc_delegreturn(inode, | |
205 | delegation->cred, | |
206 | &delegation->stateid, | |
207 | issync); | |
57bfa891 TM |
208 | nfs_free_delegation(delegation); |
209 | return res; | |
210 | } | |
211 | ||
86e89489 TM |
212 | static struct inode *nfs_delegation_grab_inode(struct nfs_delegation *delegation) |
213 | { | |
214 | struct inode *inode = NULL; | |
215 | ||
216 | spin_lock(&delegation->lock); | |
217 | if (delegation->inode != NULL) | |
218 | inode = igrab(delegation->inode); | |
219 | spin_unlock(&delegation->lock); | |
220 | return inode; | |
221 | } | |
222 | ||
d25be546 TM |
223 | static struct nfs_delegation * |
224 | nfs_start_delegation_return_locked(struct nfs_inode *nfsi) | |
225 | { | |
226 | struct nfs_delegation *ret = NULL; | |
227 | struct nfs_delegation *delegation = rcu_dereference(nfsi->delegation); | |
228 | ||
229 | if (delegation == NULL) | |
230 | goto out; | |
231 | spin_lock(&delegation->lock); | |
232 | if (!test_and_set_bit(NFS_DELEGATION_RETURNING, &delegation->flags)) | |
233 | ret = delegation; | |
234 | spin_unlock(&delegation->lock); | |
235 | out: | |
236 | return ret; | |
237 | } | |
238 | ||
239 | static struct nfs_delegation * | |
240 | nfs_start_delegation_return(struct nfs_inode *nfsi) | |
241 | { | |
242 | struct nfs_delegation *delegation; | |
243 | ||
244 | rcu_read_lock(); | |
245 | delegation = nfs_start_delegation_return_locked(nfsi); | |
246 | rcu_read_unlock(); | |
247 | return delegation; | |
248 | } | |
249 | ||
250 | static void | |
251 | nfs_abort_delegation_return(struct nfs_delegation *delegation, | |
252 | struct nfs_client *clp) | |
253 | { | |
254 | ||
255 | spin_lock(&delegation->lock); | |
256 | clear_bit(NFS_DELEGATION_RETURNING, &delegation->flags); | |
257 | set_bit(NFS_DELEGATION_RETURN, &delegation->flags); | |
258 | spin_unlock(&delegation->lock); | |
259 | set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state); | |
260 | } | |
261 | ||
dda4b225 CL |
262 | static struct nfs_delegation * |
263 | nfs_detach_delegation_locked(struct nfs_inode *nfsi, | |
d25be546 TM |
264 | struct nfs_delegation *delegation, |
265 | struct nfs_client *clp) | |
57bfa891 | 266 | { |
d25be546 | 267 | struct nfs_delegation *deleg_cur = |
17d2c0a0 | 268 | rcu_dereference_protected(nfsi->delegation, |
d25be546 | 269 | lockdep_is_held(&clp->cl_lock)); |
57bfa891 | 270 | |
d25be546 TM |
271 | if (deleg_cur == NULL || delegation != deleg_cur) |
272 | return NULL; | |
dda4b225 | 273 | |
34310430 | 274 | spin_lock(&delegation->lock); |
d25be546 | 275 | set_bit(NFS_DELEGATION_RETURNING, &delegation->flags); |
57bfa891 | 276 | list_del_rcu(&delegation->super_list); |
86e89489 | 277 | delegation->inode = NULL; |
57bfa891 TM |
278 | nfsi->delegation_state = 0; |
279 | rcu_assign_pointer(nfsi->delegation, NULL); | |
34310430 | 280 | spin_unlock(&delegation->lock); |
57bfa891 | 281 | return delegation; |
57bfa891 TM |
282 | } |
283 | ||
dda4b225 | 284 | static struct nfs_delegation *nfs_detach_delegation(struct nfs_inode *nfsi, |
d25be546 TM |
285 | struct nfs_delegation *delegation, |
286 | struct nfs_server *server) | |
dda4b225 | 287 | { |
d3978bb3 | 288 | struct nfs_client *clp = server->nfs_client; |
dda4b225 CL |
289 | |
290 | spin_lock(&clp->cl_lock); | |
d25be546 | 291 | delegation = nfs_detach_delegation_locked(nfsi, delegation, clp); |
dda4b225 CL |
292 | spin_unlock(&clp->cl_lock); |
293 | return delegation; | |
294 | } | |
295 | ||
d25be546 TM |
296 | static struct nfs_delegation * |
297 | nfs_inode_detach_delegation(struct inode *inode) | |
298 | { | |
299 | struct nfs_inode *nfsi = NFS_I(inode); | |
300 | struct nfs_server *server = NFS_SERVER(inode); | |
301 | struct nfs_delegation *delegation; | |
302 | ||
303 | delegation = nfs_start_delegation_return(nfsi); | |
304 | if (delegation == NULL) | |
305 | return NULL; | |
306 | return nfs_detach_delegation(nfsi, delegation, server); | |
307 | } | |
308 | ||
d3978bb3 CL |
309 | /** |
310 | * nfs_inode_set_delegation - set up a delegation on an inode | |
311 | * @inode: inode to which delegation applies | |
312 | * @cred: cred to use for subsequent delegation processing | |
313 | * @res: new delegation state from server | |
314 | * | |
315 | * Returns zero on success, or a negative errno value. | |
1da177e4 LT |
316 | */ |
317 | int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res) | |
318 | { | |
d3978bb3 CL |
319 | struct nfs_server *server = NFS_SERVER(inode); |
320 | struct nfs_client *clp = server->nfs_client; | |
1da177e4 | 321 | struct nfs_inode *nfsi = NFS_I(inode); |
17d2c0a0 | 322 | struct nfs_delegation *delegation, *old_delegation; |
57bfa891 | 323 | struct nfs_delegation *freeme = NULL; |
1da177e4 LT |
324 | int status = 0; |
325 | ||
8535b2be | 326 | delegation = kmalloc(sizeof(*delegation), GFP_NOFS); |
1da177e4 LT |
327 | if (delegation == NULL) |
328 | return -ENOMEM; | |
f597c537 | 329 | nfs4_stateid_copy(&delegation->stateid, &res->delegation); |
1da177e4 LT |
330 | delegation->type = res->delegation_type; |
331 | delegation->maxsize = res->maxsize; | |
a9a4a87a | 332 | delegation->change_attr = inode->i_version; |
1da177e4 LT |
333 | delegation->cred = get_rpccred(cred); |
334 | delegation->inode = inode; | |
b7391f44 | 335 | delegation->flags = 1<<NFS_DELEGATION_REFERENCED; |
34310430 | 336 | spin_lock_init(&delegation->lock); |
1da177e4 LT |
337 | |
338 | spin_lock(&clp->cl_lock); | |
17d2c0a0 | 339 | old_delegation = rcu_dereference_protected(nfsi->delegation, |
d3978bb3 | 340 | lockdep_is_held(&clp->cl_lock)); |
17d2c0a0 | 341 | if (old_delegation != NULL) { |
f597c537 TM |
342 | if (nfs4_stateid_match(&delegation->stateid, |
343 | &old_delegation->stateid) && | |
17d2c0a0 | 344 | delegation->type == old_delegation->type) { |
57bfa891 | 345 | goto out; |
1da177e4 | 346 | } |
57bfa891 TM |
347 | /* |
348 | * Deal with broken servers that hand out two | |
349 | * delegations for the same file. | |
17280175 TM |
350 | * Allow for upgrades to a WRITE delegation, but |
351 | * nothing else. | |
57bfa891 TM |
352 | */ |
353 | dfprintk(FILE, "%s: server %s handed out " | |
354 | "a duplicate delegation!\n", | |
3110ff80 | 355 | __func__, clp->cl_hostname); |
17280175 TM |
356 | if (delegation->type == old_delegation->type || |
357 | !(delegation->type & FMODE_WRITE)) { | |
57bfa891 TM |
358 | freeme = delegation; |
359 | delegation = NULL; | |
360 | goto out; | |
361 | } | |
d25be546 TM |
362 | freeme = nfs_detach_delegation_locked(nfsi, |
363 | old_delegation, clp); | |
364 | if (freeme == NULL) | |
365 | goto out; | |
1da177e4 | 366 | } |
d3978bb3 | 367 | list_add_rcu(&delegation->super_list, &server->delegations); |
57bfa891 TM |
368 | nfsi->delegation_state = delegation->type; |
369 | rcu_assign_pointer(nfsi->delegation, delegation); | |
370 | delegation = NULL; | |
412c77ce TM |
371 | |
372 | /* Ensure we revalidate the attributes and page cache! */ | |
373 | spin_lock(&inode->i_lock); | |
374 | nfsi->cache_validity |= NFS_INO_REVAL_FORCED; | |
375 | spin_unlock(&inode->i_lock); | |
ca8acf8d | 376 | trace_nfs4_set_delegation(inode, res->delegation_type); |
412c77ce | 377 | |
57bfa891 | 378 | out: |
1da177e4 | 379 | spin_unlock(&clp->cl_lock); |
603c83da TM |
380 | if (delegation != NULL) |
381 | nfs_free_delegation(delegation); | |
57bfa891 TM |
382 | if (freeme != NULL) |
383 | nfs_do_return_delegation(inode, freeme, 0); | |
1da177e4 LT |
384 | return status; |
385 | } | |
386 | ||
1da177e4 LT |
387 | /* |
388 | * Basic procedure for returning a delegation to the server | |
389 | */ | |
d25be546 | 390 | static int nfs_end_delegation_return(struct inode *inode, struct nfs_delegation *delegation, int issync) |
1da177e4 | 391 | { |
d25be546 | 392 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; |
1da177e4 | 393 | struct nfs_inode *nfsi = NFS_I(inode); |
869f9dfa | 394 | int err = 0; |
1da177e4 | 395 | |
d25be546 TM |
396 | if (delegation == NULL) |
397 | return 0; | |
398 | do { | |
869f9dfa TM |
399 | if (test_bit(NFS_DELEGATION_REVOKED, &delegation->flags)) |
400 | break; | |
d25be546 TM |
401 | err = nfs_delegation_claim_opens(inode, &delegation->stateid); |
402 | if (!issync || err != -EAGAIN) | |
403 | break; | |
404 | /* | |
405 | * Guard against state recovery | |
406 | */ | |
407 | err = nfs4_wait_clnt_recover(clp); | |
408 | } while (err == 0); | |
409 | ||
410 | if (err) { | |
411 | nfs_abort_delegation_return(delegation, clp); | |
412 | goto out; | |
413 | } | |
414 | if (!nfs_detach_delegation(nfsi, delegation, NFS_SERVER(inode))) | |
d18cc1fd | 415 | goto out; |
1da177e4 | 416 | |
d18cc1fd TM |
417 | err = nfs_do_return_delegation(inode, delegation, issync); |
418 | out: | |
419 | return err; | |
90163027 TM |
420 | } |
421 | ||
b757144f TM |
422 | static bool nfs_delegation_need_return(struct nfs_delegation *delegation) |
423 | { | |
424 | bool ret = false; | |
425 | ||
426 | if (test_and_clear_bit(NFS_DELEGATION_RETURN, &delegation->flags)) | |
427 | ret = true; | |
428 | if (test_and_clear_bit(NFS_DELEGATION_RETURN_IF_CLOSED, &delegation->flags) && !ret) { | |
429 | struct inode *inode; | |
430 | ||
431 | spin_lock(&delegation->lock); | |
432 | inode = delegation->inode; | |
433 | if (inode && list_empty(&NFS_I(inode)->open_files)) | |
434 | ret = true; | |
435 | spin_unlock(&delegation->lock); | |
436 | } | |
437 | return ret; | |
438 | } | |
439 | ||
d3978bb3 CL |
440 | /** |
441 | * nfs_client_return_marked_delegations - return previously marked delegations | |
442 | * @clp: nfs_client to process | |
443 | * | |
dc327ed4 TM |
444 | * Note that this function is designed to be called by the state |
445 | * manager thread. For this reason, it cannot flush the dirty data, | |
446 | * since that could deadlock in case of a state recovery error. | |
447 | * | |
d3978bb3 | 448 | * Returns zero on success, or a negative errno value. |
515d8611 | 449 | */ |
d18cc1fd | 450 | int nfs_client_return_marked_delegations(struct nfs_client *clp) |
515d8611 TM |
451 | { |
452 | struct nfs_delegation *delegation; | |
d3978bb3 | 453 | struct nfs_server *server; |
515d8611 | 454 | struct inode *inode; |
d18cc1fd | 455 | int err = 0; |
515d8611 TM |
456 | |
457 | restart: | |
458 | rcu_read_lock(); | |
d3978bb3 CL |
459 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { |
460 | list_for_each_entry_rcu(delegation, &server->delegations, | |
461 | super_list) { | |
b757144f | 462 | if (!nfs_delegation_need_return(delegation)) |
d3978bb3 CL |
463 | continue; |
464 | inode = nfs_delegation_grab_inode(delegation); | |
465 | if (inode == NULL) | |
466 | continue; | |
d25be546 | 467 | delegation = nfs_start_delegation_return_locked(NFS_I(inode)); |
d3978bb3 CL |
468 | rcu_read_unlock(); |
469 | ||
d25be546 | 470 | err = nfs_end_delegation_return(inode, delegation, 0); |
d3978bb3 CL |
471 | iput(inode); |
472 | if (!err) | |
473 | goto restart; | |
474 | set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state); | |
475 | return err; | |
d18cc1fd | 476 | } |
515d8611 TM |
477 | } |
478 | rcu_read_unlock(); | |
d18cc1fd | 479 | return 0; |
515d8611 TM |
480 | } |
481 | ||
d3978bb3 CL |
482 | /** |
483 | * nfs_inode_return_delegation_noreclaim - return delegation, don't reclaim opens | |
484 | * @inode: inode to process | |
485 | * | |
486 | * Does not protect against delegation reclaims, therefore really only safe | |
487 | * to be called from nfs4_clear_inode(). | |
e6f81075 TM |
488 | */ |
489 | void nfs_inode_return_delegation_noreclaim(struct inode *inode) | |
490 | { | |
e6f81075 TM |
491 | struct nfs_delegation *delegation; |
492 | ||
d25be546 TM |
493 | delegation = nfs_inode_detach_delegation(inode); |
494 | if (delegation != NULL) | |
495 | nfs_do_return_delegation(inode, delegation, 0); | |
e6f81075 TM |
496 | } |
497 | ||
d3978bb3 CL |
498 | /** |
499 | * nfs_inode_return_delegation - synchronously return a delegation | |
500 | * @inode: inode to process | |
501 | * | |
c57d1bc5 TM |
502 | * This routine will always flush any dirty data to disk on the |
503 | * assumption that if we need to return the delegation, then | |
504 | * we should stop caching. | |
505 | * | |
d3978bb3 CL |
506 | * Returns zero on success, or a negative errno value. |
507 | */ | |
57ec14c5 | 508 | int nfs4_inode_return_delegation(struct inode *inode) |
90163027 | 509 | { |
90163027 TM |
510 | struct nfs_inode *nfsi = NFS_I(inode); |
511 | struct nfs_delegation *delegation; | |
512 | int err = 0; | |
513 | ||
c57d1bc5 | 514 | nfs_wb_all(inode); |
d25be546 TM |
515 | delegation = nfs_start_delegation_return(nfsi); |
516 | if (delegation != NULL) | |
517 | err = nfs_end_delegation_return(inode, delegation, 1); | |
90163027 | 518 | return err; |
1da177e4 LT |
519 | } |
520 | ||
b757144f TM |
521 | static void nfs_mark_return_if_closed_delegation(struct nfs_server *server, |
522 | struct nfs_delegation *delegation) | |
523 | { | |
524 | set_bit(NFS_DELEGATION_RETURN_IF_CLOSED, &delegation->flags); | |
525 | set_bit(NFS4CLNT_DELEGRETURN, &server->nfs_client->cl_state); | |
526 | } | |
527 | ||
ed1e6211 TM |
528 | static void nfs_mark_return_delegation(struct nfs_server *server, |
529 | struct nfs_delegation *delegation) | |
6411bd4a TM |
530 | { |
531 | set_bit(NFS_DELEGATION_RETURN, &delegation->flags); | |
ed1e6211 | 532 | set_bit(NFS4CLNT_DELEGRETURN, &server->nfs_client->cl_state); |
6411bd4a TM |
533 | } |
534 | ||
5c31e236 TM |
535 | static bool nfs_server_mark_return_all_delegations(struct nfs_server *server) |
536 | { | |
537 | struct nfs_delegation *delegation; | |
538 | bool ret = false; | |
539 | ||
540 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { | |
541 | nfs_mark_return_delegation(server, delegation); | |
542 | ret = true; | |
543 | } | |
544 | return ret; | |
545 | } | |
546 | ||
b02ba0b6 TM |
547 | static void nfs_client_mark_return_all_delegations(struct nfs_client *clp) |
548 | { | |
549 | struct nfs_server *server; | |
550 | ||
551 | rcu_read_lock(); | |
552 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
553 | nfs_server_mark_return_all_delegations(server); | |
554 | rcu_read_unlock(); | |
555 | } | |
556 | ||
557 | static void nfs_delegation_run_state_manager(struct nfs_client *clp) | |
558 | { | |
559 | if (test_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) | |
560 | nfs4_schedule_state_manager(clp); | |
561 | } | |
562 | ||
563 | /** | |
564 | * nfs_expire_all_delegations | |
565 | * @clp: client to process | |
566 | * | |
567 | */ | |
568 | void nfs_expire_all_delegations(struct nfs_client *clp) | |
569 | { | |
570 | nfs_client_mark_return_all_delegations(clp); | |
571 | nfs_delegation_run_state_manager(clp); | |
572 | } | |
573 | ||
d3978bb3 CL |
574 | /** |
575 | * nfs_super_return_all_delegations - return delegations for one superblock | |
576 | * @sb: sb to process | |
577 | * | |
1da177e4 | 578 | */ |
eeebf916 | 579 | void nfs_server_return_all_delegations(struct nfs_server *server) |
1da177e4 | 580 | { |
d3978bb3 | 581 | struct nfs_client *clp = server->nfs_client; |
5c31e236 | 582 | bool need_wait; |
1da177e4 LT |
583 | |
584 | if (clp == NULL) | |
585 | return; | |
d3978bb3 | 586 | |
8383e460 | 587 | rcu_read_lock(); |
5c31e236 | 588 | need_wait = nfs_server_mark_return_all_delegations(server); |
8383e460 | 589 | rcu_read_unlock(); |
d3978bb3 | 590 | |
5c31e236 | 591 | if (need_wait) { |
d18cc1fd | 592 | nfs4_schedule_state_manager(clp); |
5c31e236 TM |
593 | nfs4_wait_clnt_recover(clp); |
594 | } | |
515d8611 TM |
595 | } |
596 | ||
826e0013 | 597 | static void nfs_mark_return_unused_delegation_types(struct nfs_server *server, |
d3978bb3 | 598 | fmode_t flags) |
515d8611 TM |
599 | { |
600 | struct nfs_delegation *delegation; | |
601 | ||
d3978bb3 | 602 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { |
c79571a5 AB |
603 | if ((delegation->type == (FMODE_READ|FMODE_WRITE)) && !(flags & FMODE_WRITE)) |
604 | continue; | |
605 | if (delegation->type & flags) | |
826e0013 | 606 | nfs_mark_return_if_closed_delegation(server, delegation); |
707fb4b3 | 607 | } |
d3978bb3 CL |
608 | } |
609 | ||
826e0013 | 610 | static void nfs_client_mark_return_unused_delegation_types(struct nfs_client *clp, |
d3978bb3 CL |
611 | fmode_t flags) |
612 | { | |
613 | struct nfs_server *server; | |
614 | ||
615 | rcu_read_lock(); | |
616 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
826e0013 | 617 | nfs_mark_return_unused_delegation_types(server, flags); |
515d8611 | 618 | rcu_read_unlock(); |
1da177e4 LT |
619 | } |
620 | ||
869f9dfa TM |
621 | static void nfs_revoke_delegation(struct inode *inode) |
622 | { | |
623 | struct nfs_delegation *delegation; | |
624 | rcu_read_lock(); | |
625 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
626 | if (delegation != NULL) { | |
627 | set_bit(NFS_DELEGATION_REVOKED, &delegation->flags); | |
628 | nfs_mark_return_delegation(NFS_SERVER(inode), delegation); | |
629 | } | |
630 | rcu_read_unlock(); | |
631 | } | |
632 | ||
a1d0b5ee TM |
633 | void nfs_remove_bad_delegation(struct inode *inode) |
634 | { | |
635 | struct nfs_delegation *delegation; | |
636 | ||
869f9dfa | 637 | nfs_revoke_delegation(inode); |
d25be546 | 638 | delegation = nfs_inode_detach_delegation(inode); |
a1d0b5ee TM |
639 | if (delegation) { |
640 | nfs_inode_find_state_and_recover(inode, &delegation->stateid); | |
641 | nfs_free_delegation(delegation); | |
642 | } | |
643 | } | |
9cb81968 | 644 | EXPORT_SYMBOL_GPL(nfs_remove_bad_delegation); |
a1d0b5ee | 645 | |
d3978bb3 | 646 | /** |
826e0013 | 647 | * nfs_expire_unused_delegation_types |
d3978bb3 CL |
648 | * @clp: client to process |
649 | * @flags: delegation types to expire | |
650 | * | |
651 | */ | |
826e0013 | 652 | void nfs_expire_unused_delegation_types(struct nfs_client *clp, fmode_t flags) |
58d9714a | 653 | { |
826e0013 | 654 | nfs_client_mark_return_unused_delegation_types(clp, flags); |
b0d3ded1 | 655 | nfs_delegation_run_state_manager(clp); |
58d9714a TM |
656 | } |
657 | ||
d3978bb3 | 658 | static void nfs_mark_return_unreferenced_delegations(struct nfs_server *server) |
b7391f44 TM |
659 | { |
660 | struct nfs_delegation *delegation; | |
661 | ||
d3978bb3 | 662 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { |
b7391f44 TM |
663 | if (test_and_clear_bit(NFS_DELEGATION_REFERENCED, &delegation->flags)) |
664 | continue; | |
b757144f | 665 | nfs_mark_return_if_closed_delegation(server, delegation); |
b7391f44 | 666 | } |
b7391f44 TM |
667 | } |
668 | ||
d3978bb3 CL |
669 | /** |
670 | * nfs_expire_unreferenced_delegations - Eliminate unused delegations | |
671 | * @clp: nfs_client to process | |
672 | * | |
673 | */ | |
b7391f44 TM |
674 | void nfs_expire_unreferenced_delegations(struct nfs_client *clp) |
675 | { | |
d3978bb3 CL |
676 | struct nfs_server *server; |
677 | ||
678 | rcu_read_lock(); | |
679 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
680 | nfs_mark_return_unreferenced_delegations(server); | |
681 | rcu_read_unlock(); | |
682 | ||
b7391f44 TM |
683 | nfs_delegation_run_state_manager(clp); |
684 | } | |
685 | ||
d3978bb3 CL |
686 | /** |
687 | * nfs_async_inode_return_delegation - asynchronously return a delegation | |
688 | * @inode: inode to process | |
8e663f0e | 689 | * @stateid: state ID information |
d3978bb3 CL |
690 | * |
691 | * Returns zero on success, or a negative errno value. | |
1da177e4 | 692 | */ |
d3978bb3 CL |
693 | int nfs_async_inode_return_delegation(struct inode *inode, |
694 | const nfs4_stateid *stateid) | |
1da177e4 | 695 | { |
ed1e6211 TM |
696 | struct nfs_server *server = NFS_SERVER(inode); |
697 | struct nfs_client *clp = server->nfs_client; | |
6411bd4a | 698 | struct nfs_delegation *delegation; |
1da177e4 | 699 | |
dc327ed4 TM |
700 | filemap_flush(inode->i_mapping); |
701 | ||
6411bd4a TM |
702 | rcu_read_lock(); |
703 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
755a48a7 TM |
704 | if (delegation == NULL) |
705 | goto out_enoent; | |
2597641d | 706 | |
755a48a7 TM |
707 | if (!clp->cl_mvops->match_stateid(&delegation->stateid, stateid)) |
708 | goto out_enoent; | |
ed1e6211 | 709 | nfs_mark_return_delegation(server, delegation); |
6411bd4a | 710 | rcu_read_unlock(); |
d3978bb3 | 711 | |
6411bd4a TM |
712 | nfs_delegation_run_state_manager(clp); |
713 | return 0; | |
755a48a7 TM |
714 | out_enoent: |
715 | rcu_read_unlock(); | |
716 | return -ENOENT; | |
1da177e4 LT |
717 | } |
718 | ||
d3978bb3 CL |
719 | static struct inode * |
720 | nfs_delegation_find_inode_server(struct nfs_server *server, | |
721 | const struct nfs_fh *fhandle) | |
1da177e4 LT |
722 | { |
723 | struct nfs_delegation *delegation; | |
724 | struct inode *res = NULL; | |
d3978bb3 CL |
725 | |
726 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { | |
86e89489 TM |
727 | spin_lock(&delegation->lock); |
728 | if (delegation->inode != NULL && | |
729 | nfs_compare_fh(fhandle, &NFS_I(delegation->inode)->fh) == 0) { | |
1da177e4 | 730 | res = igrab(delegation->inode); |
1da177e4 | 731 | } |
86e89489 TM |
732 | spin_unlock(&delegation->lock); |
733 | if (res != NULL) | |
734 | break; | |
1da177e4 | 735 | } |
d3978bb3 CL |
736 | return res; |
737 | } | |
738 | ||
739 | /** | |
740 | * nfs_delegation_find_inode - retrieve the inode associated with a delegation | |
741 | * @clp: client state handle | |
742 | * @fhandle: filehandle from a delegation recall | |
743 | * | |
744 | * Returns pointer to inode matching "fhandle," or NULL if a matching inode | |
745 | * cannot be found. | |
746 | */ | |
747 | struct inode *nfs_delegation_find_inode(struct nfs_client *clp, | |
748 | const struct nfs_fh *fhandle) | |
749 | { | |
750 | struct nfs_server *server; | |
751 | struct inode *res = NULL; | |
752 | ||
753 | rcu_read_lock(); | |
754 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { | |
755 | res = nfs_delegation_find_inode_server(server, fhandle); | |
756 | if (res != NULL) | |
757 | break; | |
758 | } | |
8383e460 | 759 | rcu_read_unlock(); |
1da177e4 LT |
760 | return res; |
761 | } | |
762 | ||
d3978bb3 CL |
763 | static void nfs_delegation_mark_reclaim_server(struct nfs_server *server) |
764 | { | |
765 | struct nfs_delegation *delegation; | |
766 | ||
767 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) | |
768 | set_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags); | |
769 | } | |
770 | ||
771 | /** | |
772 | * nfs_delegation_mark_reclaim - mark all delegations as needing to be reclaimed | |
773 | * @clp: nfs_client to process | |
774 | * | |
1da177e4 | 775 | */ |
adfa6f98 | 776 | void nfs_delegation_mark_reclaim(struct nfs_client *clp) |
1da177e4 | 777 | { |
d3978bb3 CL |
778 | struct nfs_server *server; |
779 | ||
8383e460 | 780 | rcu_read_lock(); |
d3978bb3 CL |
781 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) |
782 | nfs_delegation_mark_reclaim_server(server); | |
8383e460 | 783 | rcu_read_unlock(); |
1da177e4 LT |
784 | } |
785 | ||
d3978bb3 CL |
786 | /** |
787 | * nfs_delegation_reap_unclaimed - reap unclaimed delegations after reboot recovery is done | |
788 | * @clp: nfs_client to process | |
789 | * | |
1da177e4 | 790 | */ |
adfa6f98 | 791 | void nfs_delegation_reap_unclaimed(struct nfs_client *clp) |
1da177e4 | 792 | { |
8383e460 | 793 | struct nfs_delegation *delegation; |
d3978bb3 | 794 | struct nfs_server *server; |
86e89489 | 795 | struct inode *inode; |
d3978bb3 | 796 | |
8383e460 TM |
797 | restart: |
798 | rcu_read_lock(); | |
d3978bb3 CL |
799 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { |
800 | list_for_each_entry_rcu(delegation, &server->delegations, | |
801 | super_list) { | |
802 | if (test_bit(NFS_DELEGATION_NEED_RECLAIM, | |
803 | &delegation->flags) == 0) | |
804 | continue; | |
805 | inode = nfs_delegation_grab_inode(delegation); | |
806 | if (inode == NULL) | |
807 | continue; | |
808 | delegation = nfs_detach_delegation(NFS_I(inode), | |
d25be546 | 809 | delegation, server); |
d3978bb3 CL |
810 | rcu_read_unlock(); |
811 | ||
812 | if (delegation != NULL) | |
813 | nfs_free_delegation(delegation); | |
814 | iput(inode); | |
815 | goto restart; | |
816 | } | |
1da177e4 | 817 | } |
8383e460 | 818 | rcu_read_unlock(); |
1da177e4 | 819 | } |
3e4f6290 | 820 | |
d3978bb3 CL |
821 | /** |
822 | * nfs_delegations_present - check for existence of delegations | |
823 | * @clp: client state handle | |
824 | * | |
825 | * Returns one if there are any nfs_delegation structures attached | |
826 | * to this nfs_client. | |
827 | */ | |
828 | int nfs_delegations_present(struct nfs_client *clp) | |
829 | { | |
830 | struct nfs_server *server; | |
831 | int ret = 0; | |
832 | ||
833 | rcu_read_lock(); | |
834 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
835 | if (!list_empty(&server->delegations)) { | |
836 | ret = 1; | |
837 | break; | |
838 | } | |
839 | rcu_read_unlock(); | |
840 | return ret; | |
841 | } | |
842 | ||
843 | /** | |
844 | * nfs4_copy_delegation_stateid - Copy inode's state ID information | |
845 | * @dst: stateid data structure to fill in | |
846 | * @inode: inode to check | |
0032a7a7 | 847 | * @flags: delegation type requirement |
d3978bb3 | 848 | * |
0032a7a7 TM |
849 | * Returns "true" and fills in "dst->data" * if inode had a delegation, |
850 | * otherwise "false" is returned. | |
d3978bb3 | 851 | */ |
0032a7a7 TM |
852 | bool nfs4_copy_delegation_stateid(nfs4_stateid *dst, struct inode *inode, |
853 | fmode_t flags) | |
3e4f6290 | 854 | { |
3e4f6290 TM |
855 | struct nfs_inode *nfsi = NFS_I(inode); |
856 | struct nfs_delegation *delegation; | |
0032a7a7 | 857 | bool ret; |
3e4f6290 | 858 | |
0032a7a7 | 859 | flags &= FMODE_READ|FMODE_WRITE; |
8383e460 TM |
860 | rcu_read_lock(); |
861 | delegation = rcu_dereference(nfsi->delegation); | |
0032a7a7 TM |
862 | ret = (delegation != NULL && (delegation->type & flags) == flags); |
863 | if (ret) { | |
f597c537 | 864 | nfs4_stateid_copy(dst, &delegation->stateid); |
0032a7a7 | 865 | nfs_mark_delegation_referenced(delegation); |
3e4f6290 | 866 | } |
8383e460 TM |
867 | rcu_read_unlock(); |
868 | return ret; | |
3e4f6290 | 869 | } |