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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 | ||
aa05c87f TM |
44 | static bool |
45 | nfs4_is_valid_delegation(const struct nfs_delegation *delegation, | |
46 | fmode_t flags) | |
47 | { | |
48 | if (delegation != NULL && (delegation->type & flags) == flags && | |
49 | !test_bit(NFS_DELEGATION_REVOKED, &delegation->flags) && | |
50 | !test_bit(NFS_DELEGATION_RETURNING, &delegation->flags)) | |
51 | return true; | |
52 | return false; | |
53 | } | |
54 | ||
640b29e0 TM |
55 | struct nfs_delegation *nfs4_get_valid_delegation(const struct inode *inode) |
56 | { | |
57 | struct nfs_delegation *delegation; | |
58 | ||
59 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
60 | if (nfs4_is_valid_delegation(delegation, 0)) | |
61 | return delegation; | |
62 | return NULL; | |
63 | } | |
64 | ||
15bb3afe PT |
65 | static int |
66 | nfs4_do_check_delegation(struct inode *inode, fmode_t flags, bool mark) | |
b7391f44 TM |
67 | { |
68 | struct nfs_delegation *delegation; | |
69 | int ret = 0; | |
70 | ||
71 | flags &= FMODE_READ|FMODE_WRITE; | |
72 | rcu_read_lock(); | |
73 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
aa05c87f | 74 | if (nfs4_is_valid_delegation(delegation, flags)) { |
15bb3afe PT |
75 | if (mark) |
76 | nfs_mark_delegation_referenced(delegation); | |
b7391f44 TM |
77 | ret = 1; |
78 | } | |
79 | rcu_read_unlock(); | |
80 | return ret; | |
81 | } | |
15bb3afe PT |
82 | /** |
83 | * nfs_have_delegation - check if inode has a delegation, mark it | |
84 | * NFS_DELEGATION_REFERENCED if there is one. | |
85 | * @inode: inode to check | |
86 | * @flags: delegation types to check for | |
87 | * | |
88 | * Returns one if inode has the indicated delegation, otherwise zero. | |
89 | */ | |
90 | int nfs4_have_delegation(struct inode *inode, fmode_t flags) | |
91 | { | |
92 | return nfs4_do_check_delegation(inode, flags, true); | |
93 | } | |
94 | ||
95 | /* | |
96 | * nfs4_check_delegation - check if inode has a delegation, do not mark | |
97 | * NFS_DELEGATION_REFERENCED if it has one. | |
98 | */ | |
99 | int nfs4_check_delegation(struct inode *inode, fmode_t flags) | |
100 | { | |
101 | return nfs4_do_check_delegation(inode, flags, false); | |
102 | } | |
b7391f44 | 103 | |
d9871d9c | 104 | static int nfs_delegation_claim_locks(struct nfs4_state *state, const nfs4_stateid *stateid) |
888e694c TM |
105 | { |
106 | struct inode *inode = state->inode; | |
107 | struct file_lock *fl; | |
bd61e0a9 JL |
108 | struct file_lock_context *flctx = inode->i_flctx; |
109 | struct list_head *list; | |
d5122201 | 110 | int status = 0; |
888e694c | 111 | |
bd61e0a9 | 112 | if (flctx == NULL) |
65b62a29 | 113 | goto out; |
314d7cc0 | 114 | |
bd61e0a9 | 115 | list = &flctx->flc_posix; |
6109c850 | 116 | spin_lock(&flctx->flc_lock); |
bd61e0a9 JL |
117 | restart: |
118 | list_for_each_entry(fl, list, fl_list) { | |
d9871d9c | 119 | if (nfs_file_open_context(fl->fl_file)->state != state) |
888e694c | 120 | continue; |
6109c850 | 121 | spin_unlock(&flctx->flc_lock); |
db4f2e63 | 122 | status = nfs4_lock_delegation_recall(fl, state, stateid); |
d5122201 | 123 | if (status < 0) |
3f09df70 | 124 | goto out; |
6109c850 | 125 | spin_lock(&flctx->flc_lock); |
888e694c | 126 | } |
bd61e0a9 JL |
127 | if (list == &flctx->flc_posix) { |
128 | list = &flctx->flc_flock; | |
129 | goto restart; | |
888e694c | 130 | } |
6109c850 | 131 | spin_unlock(&flctx->flc_lock); |
3f09df70 | 132 | out: |
888e694c TM |
133 | return status; |
134 | } | |
135 | ||
24311f88 TM |
136 | static int nfs_delegation_claim_opens(struct inode *inode, |
137 | const nfs4_stateid *stateid, fmode_t type) | |
1da177e4 LT |
138 | { |
139 | struct nfs_inode *nfsi = NFS_I(inode); | |
140 | struct nfs_open_context *ctx; | |
d25be546 | 141 | struct nfs4_state_owner *sp; |
1da177e4 | 142 | struct nfs4_state *state; |
d25be546 | 143 | unsigned int seq; |
888e694c | 144 | int err; |
1da177e4 LT |
145 | |
146 | again: | |
147 | spin_lock(&inode->i_lock); | |
148 | list_for_each_entry(ctx, &nfsi->open_files, list) { | |
149 | state = ctx->state; | |
150 | if (state == NULL) | |
151 | continue; | |
152 | if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) | |
153 | continue; | |
f8ebf7a8 TM |
154 | if (!nfs4_valid_open_stateid(state)) |
155 | continue; | |
f597c537 | 156 | if (!nfs4_stateid_match(&state->stateid, stateid)) |
90163027 | 157 | continue; |
1da177e4 LT |
158 | get_nfs_open_context(ctx); |
159 | spin_unlock(&inode->i_lock); | |
d25be546 | 160 | sp = state->owner; |
65b62a29 TM |
161 | /* Block nfs4_proc_unlck */ |
162 | mutex_lock(&sp->so_delegreturn_mutex); | |
d25be546 | 163 | seq = raw_seqcount_begin(&sp->so_reclaim_seqcount); |
24311f88 | 164 | err = nfs4_open_delegation_recall(ctx, state, stateid, type); |
d25be546 | 165 | if (!err) |
d9871d9c | 166 | err = nfs_delegation_claim_locks(state, stateid); |
d25be546 TM |
167 | if (!err && read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) |
168 | err = -EAGAIN; | |
65b62a29 | 169 | mutex_unlock(&sp->so_delegreturn_mutex); |
1da177e4 | 170 | put_nfs_open_context(ctx); |
888e694c | 171 | if (err != 0) |
d18cc1fd | 172 | return err; |
1da177e4 LT |
173 | goto again; |
174 | } | |
175 | spin_unlock(&inode->i_lock); | |
d18cc1fd | 176 | return 0; |
1da177e4 LT |
177 | } |
178 | ||
d3978bb3 CL |
179 | /** |
180 | * nfs_inode_reclaim_delegation - process a delegation reclaim request | |
181 | * @inode: inode to process | |
182 | * @cred: credential to use for request | |
183 | * @res: new delegation state from server | |
184 | * | |
1da177e4 | 185 | */ |
d3978bb3 CL |
186 | void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, |
187 | struct nfs_openres *res) | |
1da177e4 | 188 | { |
8f649c37 TM |
189 | struct nfs_delegation *delegation; |
190 | struct rpc_cred *oldcred = NULL; | |
1da177e4 | 191 | |
8f649c37 TM |
192 | rcu_read_lock(); |
193 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
194 | if (delegation != NULL) { | |
195 | spin_lock(&delegation->lock); | |
196 | if (delegation->inode != NULL) { | |
f597c537 | 197 | nfs4_stateid_copy(&delegation->stateid, &res->delegation); |
8f649c37 | 198 | delegation->type = res->delegation_type; |
7d160a6c | 199 | delegation->pagemod_limit = res->pagemod_limit; |
8f649c37 TM |
200 | oldcred = delegation->cred; |
201 | delegation->cred = get_rpccred(cred); | |
202 | clear_bit(NFS_DELEGATION_NEED_RECLAIM, | |
203 | &delegation->flags); | |
8f649c37 | 204 | spin_unlock(&delegation->lock); |
8f649c37 | 205 | rcu_read_unlock(); |
7c0af9ff | 206 | put_rpccred(oldcred); |
ca8acf8d | 207 | trace_nfs4_reclaim_delegation(inode, res->delegation_type); |
b1a318de | 208 | return; |
8f649c37 | 209 | } |
b1a318de TM |
210 | /* We appear to have raced with a delegation return. */ |
211 | spin_unlock(&delegation->lock); | |
8f649c37 | 212 | } |
b1a318de TM |
213 | rcu_read_unlock(); |
214 | nfs_inode_set_delegation(inode, cred, res); | |
1da177e4 LT |
215 | } |
216 | ||
57bfa891 TM |
217 | static int nfs_do_return_delegation(struct inode *inode, struct nfs_delegation *delegation, int issync) |
218 | { | |
219 | int res = 0; | |
220 | ||
869f9dfa TM |
221 | if (!test_bit(NFS_DELEGATION_REVOKED, &delegation->flags)) |
222 | res = nfs4_proc_delegreturn(inode, | |
223 | delegation->cred, | |
224 | &delegation->stateid, | |
225 | issync); | |
57bfa891 TM |
226 | nfs_free_delegation(delegation); |
227 | return res; | |
228 | } | |
229 | ||
86e89489 TM |
230 | static struct inode *nfs_delegation_grab_inode(struct nfs_delegation *delegation) |
231 | { | |
232 | struct inode *inode = NULL; | |
233 | ||
234 | spin_lock(&delegation->lock); | |
235 | if (delegation->inode != NULL) | |
236 | inode = igrab(delegation->inode); | |
a155d39d TM |
237 | if (!inode) |
238 | set_bit(NFS_DELEGATION_INODE_FREEING, &delegation->flags); | |
86e89489 TM |
239 | spin_unlock(&delegation->lock); |
240 | return inode; | |
241 | } | |
242 | ||
d25be546 TM |
243 | static struct nfs_delegation * |
244 | nfs_start_delegation_return_locked(struct nfs_inode *nfsi) | |
245 | { | |
246 | struct nfs_delegation *ret = NULL; | |
247 | struct nfs_delegation *delegation = rcu_dereference(nfsi->delegation); | |
248 | ||
249 | if (delegation == NULL) | |
250 | goto out; | |
251 | spin_lock(&delegation->lock); | |
252 | if (!test_and_set_bit(NFS_DELEGATION_RETURNING, &delegation->flags)) | |
253 | ret = delegation; | |
254 | spin_unlock(&delegation->lock); | |
255 | out: | |
256 | return ret; | |
257 | } | |
258 | ||
259 | static struct nfs_delegation * | |
260 | nfs_start_delegation_return(struct nfs_inode *nfsi) | |
261 | { | |
262 | struct nfs_delegation *delegation; | |
263 | ||
264 | rcu_read_lock(); | |
265 | delegation = nfs_start_delegation_return_locked(nfsi); | |
266 | rcu_read_unlock(); | |
267 | return delegation; | |
268 | } | |
269 | ||
270 | static void | |
271 | nfs_abort_delegation_return(struct nfs_delegation *delegation, | |
272 | struct nfs_client *clp) | |
273 | { | |
274 | ||
275 | spin_lock(&delegation->lock); | |
276 | clear_bit(NFS_DELEGATION_RETURNING, &delegation->flags); | |
277 | set_bit(NFS_DELEGATION_RETURN, &delegation->flags); | |
278 | spin_unlock(&delegation->lock); | |
279 | set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state); | |
280 | } | |
281 | ||
dda4b225 CL |
282 | static struct nfs_delegation * |
283 | nfs_detach_delegation_locked(struct nfs_inode *nfsi, | |
d25be546 TM |
284 | struct nfs_delegation *delegation, |
285 | struct nfs_client *clp) | |
57bfa891 | 286 | { |
d25be546 | 287 | struct nfs_delegation *deleg_cur = |
17d2c0a0 | 288 | rcu_dereference_protected(nfsi->delegation, |
d25be546 | 289 | lockdep_is_held(&clp->cl_lock)); |
57bfa891 | 290 | |
d25be546 TM |
291 | if (deleg_cur == NULL || delegation != deleg_cur) |
292 | return NULL; | |
dda4b225 | 293 | |
34310430 | 294 | spin_lock(&delegation->lock); |
d25be546 | 295 | set_bit(NFS_DELEGATION_RETURNING, &delegation->flags); |
57bfa891 | 296 | list_del_rcu(&delegation->super_list); |
86e89489 | 297 | delegation->inode = NULL; |
57bfa891 | 298 | rcu_assign_pointer(nfsi->delegation, NULL); |
34310430 | 299 | spin_unlock(&delegation->lock); |
57bfa891 | 300 | return delegation; |
57bfa891 TM |
301 | } |
302 | ||
dda4b225 | 303 | static struct nfs_delegation *nfs_detach_delegation(struct nfs_inode *nfsi, |
d25be546 TM |
304 | struct nfs_delegation *delegation, |
305 | struct nfs_server *server) | |
dda4b225 | 306 | { |
d3978bb3 | 307 | struct nfs_client *clp = server->nfs_client; |
dda4b225 CL |
308 | |
309 | spin_lock(&clp->cl_lock); | |
d25be546 | 310 | delegation = nfs_detach_delegation_locked(nfsi, delegation, clp); |
dda4b225 CL |
311 | spin_unlock(&clp->cl_lock); |
312 | return delegation; | |
313 | } | |
314 | ||
d25be546 TM |
315 | static struct nfs_delegation * |
316 | nfs_inode_detach_delegation(struct inode *inode) | |
317 | { | |
318 | struct nfs_inode *nfsi = NFS_I(inode); | |
319 | struct nfs_server *server = NFS_SERVER(inode); | |
320 | struct nfs_delegation *delegation; | |
321 | ||
322 | delegation = nfs_start_delegation_return(nfsi); | |
323 | if (delegation == NULL) | |
324 | return NULL; | |
325 | return nfs_detach_delegation(nfsi, delegation, server); | |
326 | } | |
327 | ||
cf6726e2 TM |
328 | static void |
329 | nfs_update_inplace_delegation(struct nfs_delegation *delegation, | |
330 | const struct nfs_delegation *update) | |
331 | { | |
332 | if (nfs4_stateid_is_newer(&update->stateid, &delegation->stateid)) { | |
333 | delegation->stateid.seqid = update->stateid.seqid; | |
334 | smp_wmb(); | |
335 | delegation->type = update->type; | |
336 | } | |
337 | } | |
338 | ||
d3978bb3 CL |
339 | /** |
340 | * nfs_inode_set_delegation - set up a delegation on an inode | |
341 | * @inode: inode to which delegation applies | |
342 | * @cred: cred to use for subsequent delegation processing | |
343 | * @res: new delegation state from server | |
344 | * | |
345 | * Returns zero on success, or a negative errno value. | |
1da177e4 LT |
346 | */ |
347 | int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res) | |
348 | { | |
d3978bb3 CL |
349 | struct nfs_server *server = NFS_SERVER(inode); |
350 | struct nfs_client *clp = server->nfs_client; | |
1da177e4 | 351 | struct nfs_inode *nfsi = NFS_I(inode); |
17d2c0a0 | 352 | struct nfs_delegation *delegation, *old_delegation; |
57bfa891 | 353 | struct nfs_delegation *freeme = NULL; |
1da177e4 LT |
354 | int status = 0; |
355 | ||
8535b2be | 356 | delegation = kmalloc(sizeof(*delegation), GFP_NOFS); |
1da177e4 LT |
357 | if (delegation == NULL) |
358 | return -ENOMEM; | |
f597c537 | 359 | nfs4_stateid_copy(&delegation->stateid, &res->delegation); |
1da177e4 | 360 | delegation->type = res->delegation_type; |
7d160a6c | 361 | delegation->pagemod_limit = res->pagemod_limit; |
a9a4a87a | 362 | delegation->change_attr = inode->i_version; |
1da177e4 LT |
363 | delegation->cred = get_rpccred(cred); |
364 | delegation->inode = inode; | |
b7391f44 | 365 | delegation->flags = 1<<NFS_DELEGATION_REFERENCED; |
34310430 | 366 | spin_lock_init(&delegation->lock); |
1da177e4 LT |
367 | |
368 | spin_lock(&clp->cl_lock); | |
17d2c0a0 | 369 | old_delegation = rcu_dereference_protected(nfsi->delegation, |
d3978bb3 | 370 | lockdep_is_held(&clp->cl_lock)); |
17d2c0a0 | 371 | if (old_delegation != NULL) { |
cf6726e2 TM |
372 | /* Is this an update of the existing delegation? */ |
373 | if (nfs4_stateid_match_other(&old_delegation->stateid, | |
374 | &delegation->stateid)) { | |
375 | nfs_update_inplace_delegation(old_delegation, | |
376 | delegation); | |
57bfa891 | 377 | goto out; |
1da177e4 | 378 | } |
57bfa891 TM |
379 | /* |
380 | * Deal with broken servers that hand out two | |
381 | * delegations for the same file. | |
17280175 TM |
382 | * Allow for upgrades to a WRITE delegation, but |
383 | * nothing else. | |
57bfa891 TM |
384 | */ |
385 | dfprintk(FILE, "%s: server %s handed out " | |
386 | "a duplicate delegation!\n", | |
3110ff80 | 387 | __func__, clp->cl_hostname); |
17280175 TM |
388 | if (delegation->type == old_delegation->type || |
389 | !(delegation->type & FMODE_WRITE)) { | |
57bfa891 TM |
390 | freeme = delegation; |
391 | delegation = NULL; | |
392 | goto out; | |
393 | } | |
ade04647 TM |
394 | if (test_and_set_bit(NFS_DELEGATION_RETURNING, |
395 | &old_delegation->flags)) | |
396 | goto out; | |
397 | freeme = nfs_detach_delegation_locked(nfsi, | |
d25be546 TM |
398 | old_delegation, clp); |
399 | if (freeme == NULL) | |
400 | goto out; | |
1da177e4 | 401 | } |
38942ba2 | 402 | list_add_tail_rcu(&delegation->super_list, &server->delegations); |
57bfa891 TM |
403 | rcu_assign_pointer(nfsi->delegation, delegation); |
404 | delegation = NULL; | |
412c77ce | 405 | |
ca8acf8d | 406 | trace_nfs4_set_delegation(inode, res->delegation_type); |
412c77ce | 407 | |
57bfa891 | 408 | out: |
1da177e4 | 409 | spin_unlock(&clp->cl_lock); |
603c83da TM |
410 | if (delegation != NULL) |
411 | nfs_free_delegation(delegation); | |
57bfa891 TM |
412 | if (freeme != NULL) |
413 | nfs_do_return_delegation(inode, freeme, 0); | |
1da177e4 LT |
414 | return status; |
415 | } | |
416 | ||
1da177e4 LT |
417 | /* |
418 | * Basic procedure for returning a delegation to the server | |
419 | */ | |
d25be546 | 420 | static int nfs_end_delegation_return(struct inode *inode, struct nfs_delegation *delegation, int issync) |
1da177e4 | 421 | { |
d25be546 | 422 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; |
1da177e4 | 423 | struct nfs_inode *nfsi = NFS_I(inode); |
869f9dfa | 424 | int err = 0; |
1da177e4 | 425 | |
d25be546 TM |
426 | if (delegation == NULL) |
427 | return 0; | |
428 | do { | |
869f9dfa TM |
429 | if (test_bit(NFS_DELEGATION_REVOKED, &delegation->flags)) |
430 | break; | |
24311f88 TM |
431 | err = nfs_delegation_claim_opens(inode, &delegation->stateid, |
432 | delegation->type); | |
d25be546 TM |
433 | if (!issync || err != -EAGAIN) |
434 | break; | |
435 | /* | |
436 | * Guard against state recovery | |
437 | */ | |
438 | err = nfs4_wait_clnt_recover(clp); | |
439 | } while (err == 0); | |
440 | ||
441 | if (err) { | |
442 | nfs_abort_delegation_return(delegation, clp); | |
443 | goto out; | |
444 | } | |
445 | if (!nfs_detach_delegation(nfsi, delegation, NFS_SERVER(inode))) | |
d18cc1fd | 446 | goto out; |
1da177e4 | 447 | |
d18cc1fd TM |
448 | err = nfs_do_return_delegation(inode, delegation, issync); |
449 | out: | |
450 | return err; | |
90163027 TM |
451 | } |
452 | ||
b757144f TM |
453 | static bool nfs_delegation_need_return(struct nfs_delegation *delegation) |
454 | { | |
455 | bool ret = false; | |
456 | ||
ec3ca4e5 TM |
457 | if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags)) |
458 | goto out; | |
b757144f TM |
459 | if (test_and_clear_bit(NFS_DELEGATION_RETURN, &delegation->flags)) |
460 | ret = true; | |
461 | if (test_and_clear_bit(NFS_DELEGATION_RETURN_IF_CLOSED, &delegation->flags) && !ret) { | |
462 | struct inode *inode; | |
463 | ||
464 | spin_lock(&delegation->lock); | |
465 | inode = delegation->inode; | |
466 | if (inode && list_empty(&NFS_I(inode)->open_files)) | |
467 | ret = true; | |
468 | spin_unlock(&delegation->lock); | |
469 | } | |
ec3ca4e5 | 470 | out: |
b757144f TM |
471 | return ret; |
472 | } | |
473 | ||
d3978bb3 CL |
474 | /** |
475 | * nfs_client_return_marked_delegations - return previously marked delegations | |
476 | * @clp: nfs_client to process | |
477 | * | |
dc327ed4 TM |
478 | * Note that this function is designed to be called by the state |
479 | * manager thread. For this reason, it cannot flush the dirty data, | |
480 | * since that could deadlock in case of a state recovery error. | |
481 | * | |
d3978bb3 | 482 | * Returns zero on success, or a negative errno value. |
515d8611 | 483 | */ |
d18cc1fd | 484 | int nfs_client_return_marked_delegations(struct nfs_client *clp) |
515d8611 TM |
485 | { |
486 | struct nfs_delegation *delegation; | |
d3978bb3 | 487 | struct nfs_server *server; |
515d8611 | 488 | struct inode *inode; |
d18cc1fd | 489 | int err = 0; |
515d8611 TM |
490 | |
491 | restart: | |
492 | rcu_read_lock(); | |
d3978bb3 CL |
493 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { |
494 | list_for_each_entry_rcu(delegation, &server->delegations, | |
495 | super_list) { | |
b757144f | 496 | if (!nfs_delegation_need_return(delegation)) |
d3978bb3 | 497 | continue; |
9f0f8e12 | 498 | if (!nfs_sb_active(server->super)) |
d3978bb3 | 499 | continue; |
9f0f8e12 TM |
500 | inode = nfs_delegation_grab_inode(delegation); |
501 | if (inode == NULL) { | |
502 | rcu_read_unlock(); | |
503 | nfs_sb_deactive(server->super); | |
504 | goto restart; | |
505 | } | |
d25be546 | 506 | delegation = nfs_start_delegation_return_locked(NFS_I(inode)); |
d3978bb3 CL |
507 | rcu_read_unlock(); |
508 | ||
d25be546 | 509 | err = nfs_end_delegation_return(inode, delegation, 0); |
d3978bb3 | 510 | iput(inode); |
9f0f8e12 | 511 | nfs_sb_deactive(server->super); |
d3978bb3 CL |
512 | if (!err) |
513 | goto restart; | |
514 | set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state); | |
515 | return err; | |
d18cc1fd | 516 | } |
515d8611 TM |
517 | } |
518 | rcu_read_unlock(); | |
d18cc1fd | 519 | return 0; |
515d8611 TM |
520 | } |
521 | ||
d3978bb3 CL |
522 | /** |
523 | * nfs_inode_return_delegation_noreclaim - return delegation, don't reclaim opens | |
524 | * @inode: inode to process | |
525 | * | |
526 | * Does not protect against delegation reclaims, therefore really only safe | |
527 | * to be called from nfs4_clear_inode(). | |
e6f81075 TM |
528 | */ |
529 | void nfs_inode_return_delegation_noreclaim(struct inode *inode) | |
530 | { | |
e6f81075 TM |
531 | struct nfs_delegation *delegation; |
532 | ||
d25be546 TM |
533 | delegation = nfs_inode_detach_delegation(inode); |
534 | if (delegation != NULL) | |
5fcdfacc | 535 | nfs_do_return_delegation(inode, delegation, 1); |
e6f81075 TM |
536 | } |
537 | ||
d3978bb3 CL |
538 | /** |
539 | * nfs_inode_return_delegation - synchronously return a delegation | |
540 | * @inode: inode to process | |
541 | * | |
c57d1bc5 TM |
542 | * This routine will always flush any dirty data to disk on the |
543 | * assumption that if we need to return the delegation, then | |
544 | * we should stop caching. | |
545 | * | |
d3978bb3 CL |
546 | * Returns zero on success, or a negative errno value. |
547 | */ | |
57ec14c5 | 548 | int nfs4_inode_return_delegation(struct inode *inode) |
90163027 | 549 | { |
90163027 TM |
550 | struct nfs_inode *nfsi = NFS_I(inode); |
551 | struct nfs_delegation *delegation; | |
552 | int err = 0; | |
553 | ||
c57d1bc5 | 554 | nfs_wb_all(inode); |
d25be546 TM |
555 | delegation = nfs_start_delegation_return(nfsi); |
556 | if (delegation != NULL) | |
557 | err = nfs_end_delegation_return(inode, delegation, 1); | |
90163027 | 558 | return err; |
1da177e4 LT |
559 | } |
560 | ||
b757144f TM |
561 | static void nfs_mark_return_if_closed_delegation(struct nfs_server *server, |
562 | struct nfs_delegation *delegation) | |
563 | { | |
564 | set_bit(NFS_DELEGATION_RETURN_IF_CLOSED, &delegation->flags); | |
565 | set_bit(NFS4CLNT_DELEGRETURN, &server->nfs_client->cl_state); | |
566 | } | |
567 | ||
ed1e6211 TM |
568 | static void nfs_mark_return_delegation(struct nfs_server *server, |
569 | struct nfs_delegation *delegation) | |
6411bd4a TM |
570 | { |
571 | set_bit(NFS_DELEGATION_RETURN, &delegation->flags); | |
ed1e6211 | 572 | set_bit(NFS4CLNT_DELEGRETURN, &server->nfs_client->cl_state); |
6411bd4a TM |
573 | } |
574 | ||
5c31e236 TM |
575 | static bool nfs_server_mark_return_all_delegations(struct nfs_server *server) |
576 | { | |
577 | struct nfs_delegation *delegation; | |
578 | bool ret = false; | |
579 | ||
580 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { | |
581 | nfs_mark_return_delegation(server, delegation); | |
582 | ret = true; | |
583 | } | |
584 | return ret; | |
585 | } | |
586 | ||
b02ba0b6 TM |
587 | static void nfs_client_mark_return_all_delegations(struct nfs_client *clp) |
588 | { | |
589 | struct nfs_server *server; | |
590 | ||
591 | rcu_read_lock(); | |
592 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
593 | nfs_server_mark_return_all_delegations(server); | |
594 | rcu_read_unlock(); | |
595 | } | |
596 | ||
597 | static void nfs_delegation_run_state_manager(struct nfs_client *clp) | |
598 | { | |
599 | if (test_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) | |
600 | nfs4_schedule_state_manager(clp); | |
601 | } | |
602 | ||
603 | /** | |
604 | * nfs_expire_all_delegations | |
605 | * @clp: client to process | |
606 | * | |
607 | */ | |
608 | void nfs_expire_all_delegations(struct nfs_client *clp) | |
609 | { | |
610 | nfs_client_mark_return_all_delegations(clp); | |
611 | nfs_delegation_run_state_manager(clp); | |
612 | } | |
613 | ||
d3978bb3 CL |
614 | /** |
615 | * nfs_super_return_all_delegations - return delegations for one superblock | |
616 | * @sb: sb to process | |
617 | * | |
1da177e4 | 618 | */ |
eeebf916 | 619 | void nfs_server_return_all_delegations(struct nfs_server *server) |
1da177e4 | 620 | { |
d3978bb3 | 621 | struct nfs_client *clp = server->nfs_client; |
5c31e236 | 622 | bool need_wait; |
1da177e4 LT |
623 | |
624 | if (clp == NULL) | |
625 | return; | |
d3978bb3 | 626 | |
8383e460 | 627 | rcu_read_lock(); |
5c31e236 | 628 | need_wait = nfs_server_mark_return_all_delegations(server); |
8383e460 | 629 | rcu_read_unlock(); |
d3978bb3 | 630 | |
5c31e236 | 631 | if (need_wait) { |
d18cc1fd | 632 | nfs4_schedule_state_manager(clp); |
5c31e236 TM |
633 | nfs4_wait_clnt_recover(clp); |
634 | } | |
515d8611 TM |
635 | } |
636 | ||
826e0013 | 637 | static void nfs_mark_return_unused_delegation_types(struct nfs_server *server, |
d3978bb3 | 638 | fmode_t flags) |
515d8611 TM |
639 | { |
640 | struct nfs_delegation *delegation; | |
641 | ||
d3978bb3 | 642 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { |
c79571a5 AB |
643 | if ((delegation->type == (FMODE_READ|FMODE_WRITE)) && !(flags & FMODE_WRITE)) |
644 | continue; | |
645 | if (delegation->type & flags) | |
826e0013 | 646 | nfs_mark_return_if_closed_delegation(server, delegation); |
707fb4b3 | 647 | } |
d3978bb3 CL |
648 | } |
649 | ||
826e0013 | 650 | static void nfs_client_mark_return_unused_delegation_types(struct nfs_client *clp, |
d3978bb3 CL |
651 | fmode_t flags) |
652 | { | |
653 | struct nfs_server *server; | |
654 | ||
655 | rcu_read_lock(); | |
656 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
826e0013 | 657 | nfs_mark_return_unused_delegation_types(server, flags); |
515d8611 | 658 | rcu_read_unlock(); |
1da177e4 LT |
659 | } |
660 | ||
41020b67 TM |
661 | static void nfs_mark_delegation_revoked(struct nfs_server *server, |
662 | struct nfs_delegation *delegation) | |
663 | { | |
664 | set_bit(NFS_DELEGATION_REVOKED, &delegation->flags); | |
059b43e9 | 665 | delegation->stateid.type = NFS4_INVALID_STATEID_TYPE; |
41020b67 TM |
666 | nfs_mark_return_delegation(server, delegation); |
667 | } | |
668 | ||
669 | static bool nfs_revoke_delegation(struct inode *inode, | |
670 | const nfs4_stateid *stateid) | |
869f9dfa TM |
671 | { |
672 | struct nfs_delegation *delegation; | |
7f048831 | 673 | nfs4_stateid tmp; |
41020b67 TM |
674 | bool ret = false; |
675 | ||
869f9dfa TM |
676 | rcu_read_lock(); |
677 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
41020b67 TM |
678 | if (delegation == NULL) |
679 | goto out; | |
7f048831 TM |
680 | if (stateid == NULL) { |
681 | nfs4_stateid_copy(&tmp, &delegation->stateid); | |
682 | stateid = &tmp; | |
683 | } else if (!nfs4_stateid_match(stateid, &delegation->stateid)) | |
41020b67 TM |
684 | goto out; |
685 | nfs_mark_delegation_revoked(NFS_SERVER(inode), delegation); | |
686 | ret = true; | |
687 | out: | |
869f9dfa | 688 | rcu_read_unlock(); |
7f048831 TM |
689 | if (ret) |
690 | nfs_inode_find_state_and_recover(inode, stateid); | |
41020b67 | 691 | return ret; |
869f9dfa TM |
692 | } |
693 | ||
41020b67 TM |
694 | void nfs_remove_bad_delegation(struct inode *inode, |
695 | const nfs4_stateid *stateid) | |
a1d0b5ee TM |
696 | { |
697 | struct nfs_delegation *delegation; | |
698 | ||
41020b67 TM |
699 | if (!nfs_revoke_delegation(inode, stateid)) |
700 | return; | |
d25be546 | 701 | delegation = nfs_inode_detach_delegation(inode); |
7f048831 | 702 | if (delegation) |
a1d0b5ee | 703 | nfs_free_delegation(delegation); |
a1d0b5ee | 704 | } |
9cb81968 | 705 | EXPORT_SYMBOL_GPL(nfs_remove_bad_delegation); |
a1d0b5ee | 706 | |
d3978bb3 | 707 | /** |
826e0013 | 708 | * nfs_expire_unused_delegation_types |
d3978bb3 CL |
709 | * @clp: client to process |
710 | * @flags: delegation types to expire | |
711 | * | |
712 | */ | |
826e0013 | 713 | void nfs_expire_unused_delegation_types(struct nfs_client *clp, fmode_t flags) |
58d9714a | 714 | { |
826e0013 | 715 | nfs_client_mark_return_unused_delegation_types(clp, flags); |
b0d3ded1 | 716 | nfs_delegation_run_state_manager(clp); |
58d9714a TM |
717 | } |
718 | ||
d3978bb3 | 719 | static void nfs_mark_return_unreferenced_delegations(struct nfs_server *server) |
b7391f44 TM |
720 | { |
721 | struct nfs_delegation *delegation; | |
722 | ||
d3978bb3 | 723 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { |
b7391f44 TM |
724 | if (test_and_clear_bit(NFS_DELEGATION_REFERENCED, &delegation->flags)) |
725 | continue; | |
b757144f | 726 | nfs_mark_return_if_closed_delegation(server, delegation); |
b7391f44 | 727 | } |
b7391f44 TM |
728 | } |
729 | ||
d3978bb3 CL |
730 | /** |
731 | * nfs_expire_unreferenced_delegations - Eliminate unused delegations | |
732 | * @clp: nfs_client to process | |
733 | * | |
734 | */ | |
b7391f44 TM |
735 | void nfs_expire_unreferenced_delegations(struct nfs_client *clp) |
736 | { | |
d3978bb3 CL |
737 | struct nfs_server *server; |
738 | ||
739 | rcu_read_lock(); | |
740 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
741 | nfs_mark_return_unreferenced_delegations(server); | |
742 | rcu_read_unlock(); | |
743 | ||
b7391f44 TM |
744 | nfs_delegation_run_state_manager(clp); |
745 | } | |
746 | ||
d3978bb3 CL |
747 | /** |
748 | * nfs_async_inode_return_delegation - asynchronously return a delegation | |
749 | * @inode: inode to process | |
8e663f0e | 750 | * @stateid: state ID information |
d3978bb3 CL |
751 | * |
752 | * Returns zero on success, or a negative errno value. | |
1da177e4 | 753 | */ |
d3978bb3 CL |
754 | int nfs_async_inode_return_delegation(struct inode *inode, |
755 | const nfs4_stateid *stateid) | |
1da177e4 | 756 | { |
ed1e6211 TM |
757 | struct nfs_server *server = NFS_SERVER(inode); |
758 | struct nfs_client *clp = server->nfs_client; | |
6411bd4a | 759 | struct nfs_delegation *delegation; |
1da177e4 | 760 | |
6411bd4a TM |
761 | rcu_read_lock(); |
762 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
755a48a7 TM |
763 | if (delegation == NULL) |
764 | goto out_enoent; | |
4816fdad TM |
765 | if (stateid != NULL && |
766 | !clp->cl_mvops->match_stateid(&delegation->stateid, stateid)) | |
755a48a7 | 767 | goto out_enoent; |
ed1e6211 | 768 | nfs_mark_return_delegation(server, delegation); |
6411bd4a | 769 | rcu_read_unlock(); |
d3978bb3 | 770 | |
6411bd4a TM |
771 | nfs_delegation_run_state_manager(clp); |
772 | return 0; | |
755a48a7 TM |
773 | out_enoent: |
774 | rcu_read_unlock(); | |
775 | return -ENOENT; | |
1da177e4 LT |
776 | } |
777 | ||
d3978bb3 CL |
778 | static struct inode * |
779 | nfs_delegation_find_inode_server(struct nfs_server *server, | |
780 | const struct nfs_fh *fhandle) | |
1da177e4 LT |
781 | { |
782 | struct nfs_delegation *delegation; | |
783 | struct inode *res = NULL; | |
d3978bb3 CL |
784 | |
785 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { | |
86e89489 TM |
786 | spin_lock(&delegation->lock); |
787 | if (delegation->inode != NULL && | |
788 | nfs_compare_fh(fhandle, &NFS_I(delegation->inode)->fh) == 0) { | |
1da177e4 | 789 | res = igrab(delegation->inode); |
1da177e4 | 790 | } |
86e89489 TM |
791 | spin_unlock(&delegation->lock); |
792 | if (res != NULL) | |
793 | break; | |
1da177e4 | 794 | } |
d3978bb3 CL |
795 | return res; |
796 | } | |
797 | ||
798 | /** | |
799 | * nfs_delegation_find_inode - retrieve the inode associated with a delegation | |
800 | * @clp: client state handle | |
801 | * @fhandle: filehandle from a delegation recall | |
802 | * | |
803 | * Returns pointer to inode matching "fhandle," or NULL if a matching inode | |
804 | * cannot be found. | |
805 | */ | |
806 | struct inode *nfs_delegation_find_inode(struct nfs_client *clp, | |
807 | const struct nfs_fh *fhandle) | |
808 | { | |
809 | struct nfs_server *server; | |
810 | struct inode *res = NULL; | |
811 | ||
812 | rcu_read_lock(); | |
813 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { | |
814 | res = nfs_delegation_find_inode_server(server, fhandle); | |
815 | if (res != NULL) | |
816 | break; | |
817 | } | |
8383e460 | 818 | rcu_read_unlock(); |
1da177e4 LT |
819 | return res; |
820 | } | |
821 | ||
d3978bb3 CL |
822 | static void nfs_delegation_mark_reclaim_server(struct nfs_server *server) |
823 | { | |
824 | struct nfs_delegation *delegation; | |
825 | ||
45870d69 TM |
826 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { |
827 | /* | |
828 | * If the delegation may have been admin revoked, then we | |
829 | * cannot reclaim it. | |
830 | */ | |
831 | if (test_bit(NFS_DELEGATION_TEST_EXPIRED, &delegation->flags)) | |
832 | continue; | |
d3978bb3 | 833 | set_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags); |
45870d69 | 834 | } |
d3978bb3 CL |
835 | } |
836 | ||
837 | /** | |
838 | * nfs_delegation_mark_reclaim - mark all delegations as needing to be reclaimed | |
839 | * @clp: nfs_client to process | |
840 | * | |
1da177e4 | 841 | */ |
adfa6f98 | 842 | void nfs_delegation_mark_reclaim(struct nfs_client *clp) |
1da177e4 | 843 | { |
d3978bb3 CL |
844 | struct nfs_server *server; |
845 | ||
8383e460 | 846 | rcu_read_lock(); |
d3978bb3 CL |
847 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) |
848 | nfs_delegation_mark_reclaim_server(server); | |
8383e460 | 849 | rcu_read_unlock(); |
1da177e4 LT |
850 | } |
851 | ||
d3978bb3 CL |
852 | /** |
853 | * nfs_delegation_reap_unclaimed - reap unclaimed delegations after reboot recovery is done | |
854 | * @clp: nfs_client to process | |
855 | * | |
1da177e4 | 856 | */ |
adfa6f98 | 857 | void nfs_delegation_reap_unclaimed(struct nfs_client *clp) |
1da177e4 | 858 | { |
8383e460 | 859 | struct nfs_delegation *delegation; |
d3978bb3 | 860 | struct nfs_server *server; |
86e89489 | 861 | struct inode *inode; |
d3978bb3 | 862 | |
8383e460 TM |
863 | restart: |
864 | rcu_read_lock(); | |
d3978bb3 CL |
865 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { |
866 | list_for_each_entry_rcu(delegation, &server->delegations, | |
867 | super_list) { | |
a155d39d TM |
868 | if (test_bit(NFS_DELEGATION_INODE_FREEING, |
869 | &delegation->flags) || | |
870 | test_bit(NFS_DELEGATION_RETURNING, | |
871 | &delegation->flags) || | |
872 | test_bit(NFS_DELEGATION_NEED_RECLAIM, | |
d3978bb3 CL |
873 | &delegation->flags) == 0) |
874 | continue; | |
9f0f8e12 | 875 | if (!nfs_sb_active(server->super)) |
d3978bb3 | 876 | continue; |
9f0f8e12 TM |
877 | inode = nfs_delegation_grab_inode(delegation); |
878 | if (inode == NULL) { | |
879 | rcu_read_unlock(); | |
880 | nfs_sb_deactive(server->super); | |
881 | goto restart; | |
882 | } | |
b04b22f4 | 883 | delegation = nfs_start_delegation_return_locked(NFS_I(inode)); |
d3978bb3 | 884 | rcu_read_unlock(); |
b04b22f4 TM |
885 | if (delegation != NULL) { |
886 | delegation = nfs_detach_delegation(NFS_I(inode), | |
887 | delegation, server); | |
888 | if (delegation != NULL) | |
889 | nfs_free_delegation(delegation); | |
890 | } | |
d3978bb3 | 891 | iput(inode); |
9f0f8e12 | 892 | nfs_sb_deactive(server->super); |
d3978bb3 CL |
893 | goto restart; |
894 | } | |
1da177e4 | 895 | } |
8383e460 | 896 | rcu_read_unlock(); |
1da177e4 | 897 | } |
3e4f6290 | 898 | |
bb3d1a3b TM |
899 | static inline bool nfs4_server_rebooted(const struct nfs_client *clp) |
900 | { | |
901 | return (clp->cl_state & (BIT(NFS4CLNT_CHECK_LEASE) | | |
902 | BIT(NFS4CLNT_LEASE_EXPIRED) | | |
903 | BIT(NFS4CLNT_SESSION_RESET))) != 0; | |
904 | } | |
905 | ||
45870d69 TM |
906 | static void nfs_mark_test_expired_delegation(struct nfs_server *server, |
907 | struct nfs_delegation *delegation) | |
908 | { | |
059b43e9 TM |
909 | if (delegation->stateid.type == NFS4_INVALID_STATEID_TYPE) |
910 | return; | |
45870d69 TM |
911 | clear_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags); |
912 | set_bit(NFS_DELEGATION_TEST_EXPIRED, &delegation->flags); | |
913 | set_bit(NFS4CLNT_DELEGATION_EXPIRED, &server->nfs_client->cl_state); | |
914 | } | |
915 | ||
bb3d1a3b TM |
916 | static void nfs_inode_mark_test_expired_delegation(struct nfs_server *server, |
917 | struct inode *inode) | |
918 | { | |
919 | struct nfs_delegation *delegation; | |
920 | ||
921 | rcu_read_lock(); | |
922 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
923 | if (delegation) | |
924 | nfs_mark_test_expired_delegation(server, delegation); | |
925 | rcu_read_unlock(); | |
926 | ||
927 | } | |
928 | ||
45870d69 TM |
929 | static void nfs_delegation_mark_test_expired_server(struct nfs_server *server) |
930 | { | |
931 | struct nfs_delegation *delegation; | |
932 | ||
933 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) | |
934 | nfs_mark_test_expired_delegation(server, delegation); | |
935 | } | |
936 | ||
937 | /** | |
938 | * nfs_mark_test_expired_all_delegations - mark all delegations for testing | |
939 | * @clp: nfs_client to process | |
940 | * | |
941 | * Iterates through all the delegations associated with this server and | |
942 | * marks them as needing to be checked for validity. | |
943 | */ | |
944 | void nfs_mark_test_expired_all_delegations(struct nfs_client *clp) | |
945 | { | |
946 | struct nfs_server *server; | |
947 | ||
948 | rcu_read_lock(); | |
949 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
950 | nfs_delegation_mark_test_expired_server(server); | |
951 | rcu_read_unlock(); | |
952 | } | |
953 | ||
954 | /** | |
955 | * nfs_reap_expired_delegations - reap expired delegations | |
956 | * @clp: nfs_client to process | |
957 | * | |
958 | * Iterates through all the delegations associated with this server and | |
959 | * checks if they have may have been revoked. This function is usually | |
960 | * expected to be called in cases where the server may have lost its | |
961 | * lease. | |
962 | */ | |
963 | void nfs_reap_expired_delegations(struct nfs_client *clp) | |
964 | { | |
965 | const struct nfs4_minor_version_ops *ops = clp->cl_mvops; | |
966 | struct nfs_delegation *delegation; | |
967 | struct nfs_server *server; | |
968 | struct inode *inode; | |
969 | struct rpc_cred *cred; | |
970 | nfs4_stateid stateid; | |
971 | ||
972 | restart: | |
973 | rcu_read_lock(); | |
974 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { | |
975 | list_for_each_entry_rcu(delegation, &server->delegations, | |
976 | super_list) { | |
a155d39d TM |
977 | if (test_bit(NFS_DELEGATION_INODE_FREEING, |
978 | &delegation->flags) || | |
979 | test_bit(NFS_DELEGATION_RETURNING, | |
980 | &delegation->flags) || | |
981 | test_bit(NFS_DELEGATION_TEST_EXPIRED, | |
45870d69 TM |
982 | &delegation->flags) == 0) |
983 | continue; | |
984 | if (!nfs_sb_active(server->super)) | |
985 | continue; | |
986 | inode = nfs_delegation_grab_inode(delegation); | |
987 | if (inode == NULL) { | |
988 | rcu_read_unlock(); | |
989 | nfs_sb_deactive(server->super); | |
990 | goto restart; | |
991 | } | |
992 | cred = get_rpccred_rcu(delegation->cred); | |
993 | nfs4_stateid_copy(&stateid, &delegation->stateid); | |
994 | clear_bit(NFS_DELEGATION_TEST_EXPIRED, &delegation->flags); | |
995 | rcu_read_unlock(); | |
996 | if (cred != NULL && | |
997 | ops->test_and_free_expired(server, &stateid, cred) < 0) { | |
998 | nfs_revoke_delegation(inode, &stateid); | |
999 | nfs_inode_find_state_and_recover(inode, &stateid); | |
1000 | } | |
1001 | put_rpccred(cred); | |
bb3d1a3b TM |
1002 | if (nfs4_server_rebooted(clp)) { |
1003 | nfs_inode_mark_test_expired_delegation(server,inode); | |
1004 | iput(inode); | |
1005 | nfs_sb_deactive(server->super); | |
1006 | return; | |
1007 | } | |
45870d69 TM |
1008 | iput(inode); |
1009 | nfs_sb_deactive(server->super); | |
1010 | goto restart; | |
1011 | } | |
1012 | } | |
1013 | rcu_read_unlock(); | |
1014 | } | |
1015 | ||
6c2d8f8d TM |
1016 | void nfs_inode_find_delegation_state_and_recover(struct inode *inode, |
1017 | const nfs4_stateid *stateid) | |
1018 | { | |
1019 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; | |
1020 | struct nfs_delegation *delegation; | |
1021 | bool found = false; | |
1022 | ||
1023 | rcu_read_lock(); | |
1024 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
1025 | if (delegation && | |
1026 | nfs4_stateid_match_other(&delegation->stateid, stateid)) { | |
1027 | nfs_mark_test_expired_delegation(NFS_SERVER(inode), delegation); | |
1028 | found = true; | |
1029 | } | |
1030 | rcu_read_unlock(); | |
1031 | if (found) | |
1032 | nfs4_schedule_state_manager(clp); | |
1033 | } | |
1034 | ||
d3978bb3 CL |
1035 | /** |
1036 | * nfs_delegations_present - check for existence of delegations | |
1037 | * @clp: client state handle | |
1038 | * | |
1039 | * Returns one if there are any nfs_delegation structures attached | |
1040 | * to this nfs_client. | |
1041 | */ | |
1042 | int nfs_delegations_present(struct nfs_client *clp) | |
1043 | { | |
1044 | struct nfs_server *server; | |
1045 | int ret = 0; | |
1046 | ||
1047 | rcu_read_lock(); | |
1048 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
1049 | if (!list_empty(&server->delegations)) { | |
1050 | ret = 1; | |
1051 | break; | |
1052 | } | |
1053 | rcu_read_unlock(); | |
1054 | return ret; | |
1055 | } | |
1056 | ||
1057 | /** | |
1058 | * nfs4_copy_delegation_stateid - Copy inode's state ID information | |
d3978bb3 | 1059 | * @inode: inode to check |
0032a7a7 | 1060 | * @flags: delegation type requirement |
abf4e13c TM |
1061 | * @dst: stateid data structure to fill in |
1062 | * @cred: optional argument to retrieve credential | |
d3978bb3 | 1063 | * |
0032a7a7 TM |
1064 | * Returns "true" and fills in "dst->data" * if inode had a delegation, |
1065 | * otherwise "false" is returned. | |
d3978bb3 | 1066 | */ |
abf4e13c TM |
1067 | bool nfs4_copy_delegation_stateid(struct inode *inode, fmode_t flags, |
1068 | nfs4_stateid *dst, struct rpc_cred **cred) | |
3e4f6290 | 1069 | { |
3e4f6290 TM |
1070 | struct nfs_inode *nfsi = NFS_I(inode); |
1071 | struct nfs_delegation *delegation; | |
0032a7a7 | 1072 | bool ret; |
3e4f6290 | 1073 | |
0032a7a7 | 1074 | flags &= FMODE_READ|FMODE_WRITE; |
8383e460 TM |
1075 | rcu_read_lock(); |
1076 | delegation = rcu_dereference(nfsi->delegation); | |
aa05c87f | 1077 | ret = nfs4_is_valid_delegation(delegation, flags); |
0032a7a7 | 1078 | if (ret) { |
f597c537 | 1079 | nfs4_stateid_copy(dst, &delegation->stateid); |
0032a7a7 | 1080 | nfs_mark_delegation_referenced(delegation); |
abf4e13c TM |
1081 | if (cred) |
1082 | *cred = get_rpccred(delegation->cred); | |
3e4f6290 | 1083 | } |
8383e460 TM |
1084 | rcu_read_unlock(); |
1085 | return ret; | |
3e4f6290 | 1086 | } |
5445b1fb TM |
1087 | |
1088 | /** | |
1089 | * nfs4_delegation_flush_on_close - Check if we must flush file on close | |
1090 | * @inode: inode to check | |
1091 | * | |
1092 | * This function checks the number of outstanding writes to the file | |
1093 | * against the delegation 'space_limit' field to see if | |
1094 | * the spec requires us to flush the file on close. | |
1095 | */ | |
1096 | bool nfs4_delegation_flush_on_close(const struct inode *inode) | |
1097 | { | |
1098 | struct nfs_inode *nfsi = NFS_I(inode); | |
1099 | struct nfs_delegation *delegation; | |
1100 | bool ret = true; | |
1101 | ||
1102 | rcu_read_lock(); | |
1103 | delegation = rcu_dereference(nfsi->delegation); | |
1104 | if (delegation == NULL || !(delegation->type & FMODE_WRITE)) | |
1105 | goto out; | |
a6b6d5b8 | 1106 | if (atomic_long_read(&nfsi->nrequests) < delegation->pagemod_limit) |
5445b1fb TM |
1107 | ret = false; |
1108 | out: | |
1109 | rcu_read_unlock(); | |
1110 | return ret; | |
1111 | } |