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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 | ||
15bb3afe PT |
55 | static int |
56 | nfs4_do_check_delegation(struct inode *inode, fmode_t flags, bool mark) | |
b7391f44 TM |
57 | { |
58 | struct nfs_delegation *delegation; | |
59 | int ret = 0; | |
60 | ||
61 | flags &= FMODE_READ|FMODE_WRITE; | |
62 | rcu_read_lock(); | |
63 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
aa05c87f | 64 | if (nfs4_is_valid_delegation(delegation, flags)) { |
15bb3afe PT |
65 | if (mark) |
66 | nfs_mark_delegation_referenced(delegation); | |
b7391f44 TM |
67 | ret = 1; |
68 | } | |
69 | rcu_read_unlock(); | |
70 | return ret; | |
71 | } | |
15bb3afe PT |
72 | /** |
73 | * nfs_have_delegation - check if inode has a delegation, mark it | |
74 | * NFS_DELEGATION_REFERENCED if there is one. | |
75 | * @inode: inode to check | |
76 | * @flags: delegation types to check for | |
77 | * | |
78 | * Returns one if inode has the indicated delegation, otherwise zero. | |
79 | */ | |
80 | int nfs4_have_delegation(struct inode *inode, fmode_t flags) | |
81 | { | |
82 | return nfs4_do_check_delegation(inode, flags, true); | |
83 | } | |
84 | ||
85 | /* | |
86 | * nfs4_check_delegation - check if inode has a delegation, do not mark | |
87 | * NFS_DELEGATION_REFERENCED if it has one. | |
88 | */ | |
89 | int nfs4_check_delegation(struct inode *inode, fmode_t flags) | |
90 | { | |
91 | return nfs4_do_check_delegation(inode, flags, false); | |
92 | } | |
b7391f44 | 93 | |
db4f2e63 | 94 | static int nfs_delegation_claim_locks(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid) |
888e694c TM |
95 | { |
96 | struct inode *inode = state->inode; | |
97 | struct file_lock *fl; | |
bd61e0a9 JL |
98 | struct file_lock_context *flctx = inode->i_flctx; |
99 | struct list_head *list; | |
d5122201 | 100 | int status = 0; |
888e694c | 101 | |
bd61e0a9 | 102 | if (flctx == NULL) |
65b62a29 | 103 | goto out; |
314d7cc0 | 104 | |
bd61e0a9 | 105 | list = &flctx->flc_posix; |
6109c850 | 106 | spin_lock(&flctx->flc_lock); |
bd61e0a9 JL |
107 | restart: |
108 | list_for_each_entry(fl, list, fl_list) { | |
cd3758e3 | 109 | if (nfs_file_open_context(fl->fl_file) != ctx) |
888e694c | 110 | continue; |
6109c850 | 111 | spin_unlock(&flctx->flc_lock); |
db4f2e63 | 112 | status = nfs4_lock_delegation_recall(fl, state, stateid); |
d5122201 | 113 | if (status < 0) |
3f09df70 | 114 | goto out; |
6109c850 | 115 | spin_lock(&flctx->flc_lock); |
888e694c | 116 | } |
bd61e0a9 JL |
117 | if (list == &flctx->flc_posix) { |
118 | list = &flctx->flc_flock; | |
119 | goto restart; | |
888e694c | 120 | } |
6109c850 | 121 | spin_unlock(&flctx->flc_lock); |
3f09df70 | 122 | out: |
888e694c TM |
123 | return status; |
124 | } | |
125 | ||
24311f88 TM |
126 | static int nfs_delegation_claim_opens(struct inode *inode, |
127 | const nfs4_stateid *stateid, fmode_t type) | |
1da177e4 LT |
128 | { |
129 | struct nfs_inode *nfsi = NFS_I(inode); | |
130 | struct nfs_open_context *ctx; | |
d25be546 | 131 | struct nfs4_state_owner *sp; |
1da177e4 | 132 | struct nfs4_state *state; |
d25be546 | 133 | unsigned int seq; |
888e694c | 134 | int err; |
1da177e4 LT |
135 | |
136 | again: | |
137 | spin_lock(&inode->i_lock); | |
138 | list_for_each_entry(ctx, &nfsi->open_files, list) { | |
139 | state = ctx->state; | |
140 | if (state == NULL) | |
141 | continue; | |
142 | if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) | |
143 | continue; | |
f8ebf7a8 TM |
144 | if (!nfs4_valid_open_stateid(state)) |
145 | continue; | |
f597c537 | 146 | if (!nfs4_stateid_match(&state->stateid, stateid)) |
90163027 | 147 | continue; |
1da177e4 LT |
148 | get_nfs_open_context(ctx); |
149 | spin_unlock(&inode->i_lock); | |
d25be546 | 150 | sp = state->owner; |
65b62a29 TM |
151 | /* Block nfs4_proc_unlck */ |
152 | mutex_lock(&sp->so_delegreturn_mutex); | |
d25be546 | 153 | seq = raw_seqcount_begin(&sp->so_reclaim_seqcount); |
24311f88 | 154 | err = nfs4_open_delegation_recall(ctx, state, stateid, type); |
d25be546 | 155 | if (!err) |
db4f2e63 | 156 | err = nfs_delegation_claim_locks(ctx, state, stateid); |
d25be546 TM |
157 | if (!err && read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) |
158 | err = -EAGAIN; | |
65b62a29 | 159 | mutex_unlock(&sp->so_delegreturn_mutex); |
1da177e4 | 160 | put_nfs_open_context(ctx); |
888e694c | 161 | if (err != 0) |
d18cc1fd | 162 | return err; |
1da177e4 LT |
163 | goto again; |
164 | } | |
165 | spin_unlock(&inode->i_lock); | |
d18cc1fd | 166 | return 0; |
1da177e4 LT |
167 | } |
168 | ||
d3978bb3 CL |
169 | /** |
170 | * nfs_inode_reclaim_delegation - process a delegation reclaim request | |
171 | * @inode: inode to process | |
172 | * @cred: credential to use for request | |
173 | * @res: new delegation state from server | |
174 | * | |
1da177e4 | 175 | */ |
d3978bb3 CL |
176 | void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, |
177 | struct nfs_openres *res) | |
1da177e4 | 178 | { |
8f649c37 TM |
179 | struct nfs_delegation *delegation; |
180 | struct rpc_cred *oldcred = NULL; | |
1da177e4 | 181 | |
8f649c37 TM |
182 | rcu_read_lock(); |
183 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
184 | if (delegation != NULL) { | |
185 | spin_lock(&delegation->lock); | |
186 | if (delegation->inode != NULL) { | |
f597c537 | 187 | nfs4_stateid_copy(&delegation->stateid, &res->delegation); |
8f649c37 | 188 | delegation->type = res->delegation_type; |
7d160a6c | 189 | delegation->pagemod_limit = res->pagemod_limit; |
8f649c37 TM |
190 | oldcred = delegation->cred; |
191 | delegation->cred = get_rpccred(cred); | |
192 | clear_bit(NFS_DELEGATION_NEED_RECLAIM, | |
193 | &delegation->flags); | |
8f649c37 | 194 | spin_unlock(&delegation->lock); |
8f649c37 | 195 | rcu_read_unlock(); |
7c0af9ff | 196 | put_rpccred(oldcred); |
ca8acf8d | 197 | trace_nfs4_reclaim_delegation(inode, res->delegation_type); |
b1a318de | 198 | return; |
8f649c37 | 199 | } |
b1a318de TM |
200 | /* We appear to have raced with a delegation return. */ |
201 | spin_unlock(&delegation->lock); | |
8f649c37 | 202 | } |
b1a318de TM |
203 | rcu_read_unlock(); |
204 | nfs_inode_set_delegation(inode, cred, res); | |
1da177e4 LT |
205 | } |
206 | ||
57bfa891 TM |
207 | static int nfs_do_return_delegation(struct inode *inode, struct nfs_delegation *delegation, int issync) |
208 | { | |
209 | int res = 0; | |
210 | ||
869f9dfa TM |
211 | if (!test_bit(NFS_DELEGATION_REVOKED, &delegation->flags)) |
212 | res = nfs4_proc_delegreturn(inode, | |
213 | delegation->cred, | |
214 | &delegation->stateid, | |
215 | issync); | |
57bfa891 TM |
216 | nfs_free_delegation(delegation); |
217 | return res; | |
218 | } | |
219 | ||
86e89489 TM |
220 | static struct inode *nfs_delegation_grab_inode(struct nfs_delegation *delegation) |
221 | { | |
222 | struct inode *inode = NULL; | |
223 | ||
224 | spin_lock(&delegation->lock); | |
225 | if (delegation->inode != NULL) | |
226 | inode = igrab(delegation->inode); | |
227 | spin_unlock(&delegation->lock); | |
228 | return inode; | |
229 | } | |
230 | ||
d25be546 TM |
231 | static struct nfs_delegation * |
232 | nfs_start_delegation_return_locked(struct nfs_inode *nfsi) | |
233 | { | |
234 | struct nfs_delegation *ret = NULL; | |
235 | struct nfs_delegation *delegation = rcu_dereference(nfsi->delegation); | |
236 | ||
237 | if (delegation == NULL) | |
238 | goto out; | |
239 | spin_lock(&delegation->lock); | |
240 | if (!test_and_set_bit(NFS_DELEGATION_RETURNING, &delegation->flags)) | |
241 | ret = delegation; | |
242 | spin_unlock(&delegation->lock); | |
243 | out: | |
244 | return ret; | |
245 | } | |
246 | ||
247 | static struct nfs_delegation * | |
248 | nfs_start_delegation_return(struct nfs_inode *nfsi) | |
249 | { | |
250 | struct nfs_delegation *delegation; | |
251 | ||
252 | rcu_read_lock(); | |
253 | delegation = nfs_start_delegation_return_locked(nfsi); | |
254 | rcu_read_unlock(); | |
255 | return delegation; | |
256 | } | |
257 | ||
258 | static void | |
259 | nfs_abort_delegation_return(struct nfs_delegation *delegation, | |
260 | struct nfs_client *clp) | |
261 | { | |
262 | ||
263 | spin_lock(&delegation->lock); | |
264 | clear_bit(NFS_DELEGATION_RETURNING, &delegation->flags); | |
265 | set_bit(NFS_DELEGATION_RETURN, &delegation->flags); | |
266 | spin_unlock(&delegation->lock); | |
267 | set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state); | |
268 | } | |
269 | ||
dda4b225 CL |
270 | static struct nfs_delegation * |
271 | nfs_detach_delegation_locked(struct nfs_inode *nfsi, | |
d25be546 TM |
272 | struct nfs_delegation *delegation, |
273 | struct nfs_client *clp) | |
57bfa891 | 274 | { |
d25be546 | 275 | struct nfs_delegation *deleg_cur = |
17d2c0a0 | 276 | rcu_dereference_protected(nfsi->delegation, |
d25be546 | 277 | lockdep_is_held(&clp->cl_lock)); |
57bfa891 | 278 | |
d25be546 TM |
279 | if (deleg_cur == NULL || delegation != deleg_cur) |
280 | return NULL; | |
dda4b225 | 281 | |
34310430 | 282 | spin_lock(&delegation->lock); |
d25be546 | 283 | set_bit(NFS_DELEGATION_RETURNING, &delegation->flags); |
57bfa891 | 284 | list_del_rcu(&delegation->super_list); |
86e89489 | 285 | delegation->inode = NULL; |
57bfa891 | 286 | rcu_assign_pointer(nfsi->delegation, NULL); |
34310430 | 287 | spin_unlock(&delegation->lock); |
57bfa891 | 288 | return delegation; |
57bfa891 TM |
289 | } |
290 | ||
dda4b225 | 291 | static struct nfs_delegation *nfs_detach_delegation(struct nfs_inode *nfsi, |
d25be546 TM |
292 | struct nfs_delegation *delegation, |
293 | struct nfs_server *server) | |
dda4b225 | 294 | { |
d3978bb3 | 295 | struct nfs_client *clp = server->nfs_client; |
dda4b225 CL |
296 | |
297 | spin_lock(&clp->cl_lock); | |
d25be546 | 298 | delegation = nfs_detach_delegation_locked(nfsi, delegation, clp); |
dda4b225 CL |
299 | spin_unlock(&clp->cl_lock); |
300 | return delegation; | |
301 | } | |
302 | ||
d25be546 TM |
303 | static struct nfs_delegation * |
304 | nfs_inode_detach_delegation(struct inode *inode) | |
305 | { | |
306 | struct nfs_inode *nfsi = NFS_I(inode); | |
307 | struct nfs_server *server = NFS_SERVER(inode); | |
308 | struct nfs_delegation *delegation; | |
309 | ||
310 | delegation = nfs_start_delegation_return(nfsi); | |
311 | if (delegation == NULL) | |
312 | return NULL; | |
313 | return nfs_detach_delegation(nfsi, delegation, server); | |
314 | } | |
315 | ||
cf6726e2 TM |
316 | static void |
317 | nfs_update_inplace_delegation(struct nfs_delegation *delegation, | |
318 | const struct nfs_delegation *update) | |
319 | { | |
320 | if (nfs4_stateid_is_newer(&update->stateid, &delegation->stateid)) { | |
321 | delegation->stateid.seqid = update->stateid.seqid; | |
322 | smp_wmb(); | |
323 | delegation->type = update->type; | |
324 | } | |
325 | } | |
326 | ||
d3978bb3 CL |
327 | /** |
328 | * nfs_inode_set_delegation - set up a delegation on an inode | |
329 | * @inode: inode to which delegation applies | |
330 | * @cred: cred to use for subsequent delegation processing | |
331 | * @res: new delegation state from server | |
332 | * | |
333 | * Returns zero on success, or a negative errno value. | |
1da177e4 LT |
334 | */ |
335 | int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res) | |
336 | { | |
d3978bb3 CL |
337 | struct nfs_server *server = NFS_SERVER(inode); |
338 | struct nfs_client *clp = server->nfs_client; | |
1da177e4 | 339 | struct nfs_inode *nfsi = NFS_I(inode); |
17d2c0a0 | 340 | struct nfs_delegation *delegation, *old_delegation; |
57bfa891 | 341 | struct nfs_delegation *freeme = NULL; |
1da177e4 LT |
342 | int status = 0; |
343 | ||
8535b2be | 344 | delegation = kmalloc(sizeof(*delegation), GFP_NOFS); |
1da177e4 LT |
345 | if (delegation == NULL) |
346 | return -ENOMEM; | |
f597c537 | 347 | nfs4_stateid_copy(&delegation->stateid, &res->delegation); |
1da177e4 | 348 | delegation->type = res->delegation_type; |
7d160a6c | 349 | delegation->pagemod_limit = res->pagemod_limit; |
a9a4a87a | 350 | delegation->change_attr = inode->i_version; |
1da177e4 LT |
351 | delegation->cred = get_rpccred(cred); |
352 | delegation->inode = inode; | |
b7391f44 | 353 | delegation->flags = 1<<NFS_DELEGATION_REFERENCED; |
34310430 | 354 | spin_lock_init(&delegation->lock); |
1da177e4 LT |
355 | |
356 | spin_lock(&clp->cl_lock); | |
17d2c0a0 | 357 | old_delegation = rcu_dereference_protected(nfsi->delegation, |
d3978bb3 | 358 | lockdep_is_held(&clp->cl_lock)); |
17d2c0a0 | 359 | if (old_delegation != NULL) { |
cf6726e2 TM |
360 | /* Is this an update of the existing delegation? */ |
361 | if (nfs4_stateid_match_other(&old_delegation->stateid, | |
362 | &delegation->stateid)) { | |
363 | nfs_update_inplace_delegation(old_delegation, | |
364 | delegation); | |
57bfa891 | 365 | goto out; |
1da177e4 | 366 | } |
57bfa891 TM |
367 | /* |
368 | * Deal with broken servers that hand out two | |
369 | * delegations for the same file. | |
17280175 TM |
370 | * Allow for upgrades to a WRITE delegation, but |
371 | * nothing else. | |
57bfa891 TM |
372 | */ |
373 | dfprintk(FILE, "%s: server %s handed out " | |
374 | "a duplicate delegation!\n", | |
3110ff80 | 375 | __func__, clp->cl_hostname); |
17280175 TM |
376 | if (delegation->type == old_delegation->type || |
377 | !(delegation->type & FMODE_WRITE)) { | |
57bfa891 TM |
378 | freeme = delegation; |
379 | delegation = NULL; | |
380 | goto out; | |
381 | } | |
ade04647 TM |
382 | if (test_and_set_bit(NFS_DELEGATION_RETURNING, |
383 | &old_delegation->flags)) | |
384 | goto out; | |
385 | freeme = nfs_detach_delegation_locked(nfsi, | |
d25be546 TM |
386 | old_delegation, clp); |
387 | if (freeme == NULL) | |
388 | goto out; | |
1da177e4 | 389 | } |
38942ba2 | 390 | list_add_tail_rcu(&delegation->super_list, &server->delegations); |
57bfa891 TM |
391 | rcu_assign_pointer(nfsi->delegation, delegation); |
392 | delegation = NULL; | |
412c77ce TM |
393 | |
394 | /* Ensure we revalidate the attributes and page cache! */ | |
395 | spin_lock(&inode->i_lock); | |
396 | nfsi->cache_validity |= NFS_INO_REVAL_FORCED; | |
397 | spin_unlock(&inode->i_lock); | |
ca8acf8d | 398 | trace_nfs4_set_delegation(inode, res->delegation_type); |
412c77ce | 399 | |
57bfa891 | 400 | out: |
1da177e4 | 401 | spin_unlock(&clp->cl_lock); |
603c83da TM |
402 | if (delegation != NULL) |
403 | nfs_free_delegation(delegation); | |
57bfa891 TM |
404 | if (freeme != NULL) |
405 | nfs_do_return_delegation(inode, freeme, 0); | |
1da177e4 LT |
406 | return status; |
407 | } | |
408 | ||
1da177e4 LT |
409 | /* |
410 | * Basic procedure for returning a delegation to the server | |
411 | */ | |
d25be546 | 412 | static int nfs_end_delegation_return(struct inode *inode, struct nfs_delegation *delegation, int issync) |
1da177e4 | 413 | { |
d25be546 | 414 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; |
1da177e4 | 415 | struct nfs_inode *nfsi = NFS_I(inode); |
869f9dfa | 416 | int err = 0; |
1da177e4 | 417 | |
d25be546 TM |
418 | if (delegation == NULL) |
419 | return 0; | |
420 | do { | |
869f9dfa TM |
421 | if (test_bit(NFS_DELEGATION_REVOKED, &delegation->flags)) |
422 | break; | |
24311f88 TM |
423 | err = nfs_delegation_claim_opens(inode, &delegation->stateid, |
424 | delegation->type); | |
d25be546 TM |
425 | if (!issync || err != -EAGAIN) |
426 | break; | |
427 | /* | |
428 | * Guard against state recovery | |
429 | */ | |
430 | err = nfs4_wait_clnt_recover(clp); | |
431 | } while (err == 0); | |
432 | ||
433 | if (err) { | |
434 | nfs_abort_delegation_return(delegation, clp); | |
435 | goto out; | |
436 | } | |
437 | if (!nfs_detach_delegation(nfsi, delegation, NFS_SERVER(inode))) | |
d18cc1fd | 438 | goto out; |
1da177e4 | 439 | |
d18cc1fd TM |
440 | err = nfs_do_return_delegation(inode, delegation, issync); |
441 | out: | |
442 | return err; | |
90163027 TM |
443 | } |
444 | ||
b757144f TM |
445 | static bool nfs_delegation_need_return(struct nfs_delegation *delegation) |
446 | { | |
447 | bool ret = false; | |
448 | ||
ec3ca4e5 TM |
449 | if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags)) |
450 | goto out; | |
b757144f TM |
451 | if (test_and_clear_bit(NFS_DELEGATION_RETURN, &delegation->flags)) |
452 | ret = true; | |
453 | if (test_and_clear_bit(NFS_DELEGATION_RETURN_IF_CLOSED, &delegation->flags) && !ret) { | |
454 | struct inode *inode; | |
455 | ||
456 | spin_lock(&delegation->lock); | |
457 | inode = delegation->inode; | |
458 | if (inode && list_empty(&NFS_I(inode)->open_files)) | |
459 | ret = true; | |
460 | spin_unlock(&delegation->lock); | |
461 | } | |
ec3ca4e5 | 462 | out: |
b757144f TM |
463 | return ret; |
464 | } | |
465 | ||
d3978bb3 CL |
466 | /** |
467 | * nfs_client_return_marked_delegations - return previously marked delegations | |
468 | * @clp: nfs_client to process | |
469 | * | |
dc327ed4 TM |
470 | * Note that this function is designed to be called by the state |
471 | * manager thread. For this reason, it cannot flush the dirty data, | |
472 | * since that could deadlock in case of a state recovery error. | |
473 | * | |
d3978bb3 | 474 | * Returns zero on success, or a negative errno value. |
515d8611 | 475 | */ |
d18cc1fd | 476 | int nfs_client_return_marked_delegations(struct nfs_client *clp) |
515d8611 TM |
477 | { |
478 | struct nfs_delegation *delegation; | |
d3978bb3 | 479 | struct nfs_server *server; |
515d8611 | 480 | struct inode *inode; |
d18cc1fd | 481 | int err = 0; |
515d8611 TM |
482 | |
483 | restart: | |
484 | rcu_read_lock(); | |
d3978bb3 CL |
485 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { |
486 | list_for_each_entry_rcu(delegation, &server->delegations, | |
487 | super_list) { | |
b757144f | 488 | if (!nfs_delegation_need_return(delegation)) |
d3978bb3 | 489 | continue; |
9f0f8e12 | 490 | if (!nfs_sb_active(server->super)) |
d3978bb3 | 491 | continue; |
9f0f8e12 TM |
492 | inode = nfs_delegation_grab_inode(delegation); |
493 | if (inode == NULL) { | |
494 | rcu_read_unlock(); | |
495 | nfs_sb_deactive(server->super); | |
496 | goto restart; | |
497 | } | |
d25be546 | 498 | delegation = nfs_start_delegation_return_locked(NFS_I(inode)); |
d3978bb3 CL |
499 | rcu_read_unlock(); |
500 | ||
d25be546 | 501 | err = nfs_end_delegation_return(inode, delegation, 0); |
d3978bb3 | 502 | iput(inode); |
9f0f8e12 | 503 | nfs_sb_deactive(server->super); |
d3978bb3 CL |
504 | if (!err) |
505 | goto restart; | |
506 | set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state); | |
507 | return err; | |
d18cc1fd | 508 | } |
515d8611 TM |
509 | } |
510 | rcu_read_unlock(); | |
d18cc1fd | 511 | return 0; |
515d8611 TM |
512 | } |
513 | ||
d3978bb3 CL |
514 | /** |
515 | * nfs_inode_return_delegation_noreclaim - return delegation, don't reclaim opens | |
516 | * @inode: inode to process | |
517 | * | |
518 | * Does not protect against delegation reclaims, therefore really only safe | |
519 | * to be called from nfs4_clear_inode(). | |
e6f81075 TM |
520 | */ |
521 | void nfs_inode_return_delegation_noreclaim(struct inode *inode) | |
522 | { | |
e6f81075 TM |
523 | struct nfs_delegation *delegation; |
524 | ||
d25be546 TM |
525 | delegation = nfs_inode_detach_delegation(inode); |
526 | if (delegation != NULL) | |
5fcdfacc | 527 | nfs_do_return_delegation(inode, delegation, 1); |
e6f81075 TM |
528 | } |
529 | ||
d3978bb3 CL |
530 | /** |
531 | * nfs_inode_return_delegation - synchronously return a delegation | |
532 | * @inode: inode to process | |
533 | * | |
c57d1bc5 TM |
534 | * This routine will always flush any dirty data to disk on the |
535 | * assumption that if we need to return the delegation, then | |
536 | * we should stop caching. | |
537 | * | |
d3978bb3 CL |
538 | * Returns zero on success, or a negative errno value. |
539 | */ | |
57ec14c5 | 540 | int nfs4_inode_return_delegation(struct inode *inode) |
90163027 | 541 | { |
90163027 TM |
542 | struct nfs_inode *nfsi = NFS_I(inode); |
543 | struct nfs_delegation *delegation; | |
544 | int err = 0; | |
545 | ||
c57d1bc5 | 546 | nfs_wb_all(inode); |
d25be546 TM |
547 | delegation = nfs_start_delegation_return(nfsi); |
548 | if (delegation != NULL) | |
549 | err = nfs_end_delegation_return(inode, delegation, 1); | |
90163027 | 550 | return err; |
1da177e4 LT |
551 | } |
552 | ||
b757144f TM |
553 | static void nfs_mark_return_if_closed_delegation(struct nfs_server *server, |
554 | struct nfs_delegation *delegation) | |
555 | { | |
556 | set_bit(NFS_DELEGATION_RETURN_IF_CLOSED, &delegation->flags); | |
557 | set_bit(NFS4CLNT_DELEGRETURN, &server->nfs_client->cl_state); | |
558 | } | |
559 | ||
ed1e6211 TM |
560 | static void nfs_mark_return_delegation(struct nfs_server *server, |
561 | struct nfs_delegation *delegation) | |
6411bd4a TM |
562 | { |
563 | set_bit(NFS_DELEGATION_RETURN, &delegation->flags); | |
ed1e6211 | 564 | set_bit(NFS4CLNT_DELEGRETURN, &server->nfs_client->cl_state); |
6411bd4a TM |
565 | } |
566 | ||
5c31e236 TM |
567 | static bool nfs_server_mark_return_all_delegations(struct nfs_server *server) |
568 | { | |
569 | struct nfs_delegation *delegation; | |
570 | bool ret = false; | |
571 | ||
572 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { | |
573 | nfs_mark_return_delegation(server, delegation); | |
574 | ret = true; | |
575 | } | |
576 | return ret; | |
577 | } | |
578 | ||
b02ba0b6 TM |
579 | static void nfs_client_mark_return_all_delegations(struct nfs_client *clp) |
580 | { | |
581 | struct nfs_server *server; | |
582 | ||
583 | rcu_read_lock(); | |
584 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
585 | nfs_server_mark_return_all_delegations(server); | |
586 | rcu_read_unlock(); | |
587 | } | |
588 | ||
589 | static void nfs_delegation_run_state_manager(struct nfs_client *clp) | |
590 | { | |
591 | if (test_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) | |
592 | nfs4_schedule_state_manager(clp); | |
593 | } | |
594 | ||
595 | /** | |
596 | * nfs_expire_all_delegations | |
597 | * @clp: client to process | |
598 | * | |
599 | */ | |
600 | void nfs_expire_all_delegations(struct nfs_client *clp) | |
601 | { | |
602 | nfs_client_mark_return_all_delegations(clp); | |
603 | nfs_delegation_run_state_manager(clp); | |
604 | } | |
605 | ||
d3978bb3 CL |
606 | /** |
607 | * nfs_super_return_all_delegations - return delegations for one superblock | |
608 | * @sb: sb to process | |
609 | * | |
1da177e4 | 610 | */ |
eeebf916 | 611 | void nfs_server_return_all_delegations(struct nfs_server *server) |
1da177e4 | 612 | { |
d3978bb3 | 613 | struct nfs_client *clp = server->nfs_client; |
5c31e236 | 614 | bool need_wait; |
1da177e4 LT |
615 | |
616 | if (clp == NULL) | |
617 | return; | |
d3978bb3 | 618 | |
8383e460 | 619 | rcu_read_lock(); |
5c31e236 | 620 | need_wait = nfs_server_mark_return_all_delegations(server); |
8383e460 | 621 | rcu_read_unlock(); |
d3978bb3 | 622 | |
5c31e236 | 623 | if (need_wait) { |
d18cc1fd | 624 | nfs4_schedule_state_manager(clp); |
5c31e236 TM |
625 | nfs4_wait_clnt_recover(clp); |
626 | } | |
515d8611 TM |
627 | } |
628 | ||
826e0013 | 629 | static void nfs_mark_return_unused_delegation_types(struct nfs_server *server, |
d3978bb3 | 630 | fmode_t flags) |
515d8611 TM |
631 | { |
632 | struct nfs_delegation *delegation; | |
633 | ||
d3978bb3 | 634 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { |
c79571a5 AB |
635 | if ((delegation->type == (FMODE_READ|FMODE_WRITE)) && !(flags & FMODE_WRITE)) |
636 | continue; | |
637 | if (delegation->type & flags) | |
826e0013 | 638 | nfs_mark_return_if_closed_delegation(server, delegation); |
707fb4b3 | 639 | } |
d3978bb3 CL |
640 | } |
641 | ||
826e0013 | 642 | static void nfs_client_mark_return_unused_delegation_types(struct nfs_client *clp, |
d3978bb3 CL |
643 | fmode_t flags) |
644 | { | |
645 | struct nfs_server *server; | |
646 | ||
647 | rcu_read_lock(); | |
648 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
826e0013 | 649 | nfs_mark_return_unused_delegation_types(server, flags); |
515d8611 | 650 | rcu_read_unlock(); |
1da177e4 LT |
651 | } |
652 | ||
41020b67 TM |
653 | static void nfs_mark_delegation_revoked(struct nfs_server *server, |
654 | struct nfs_delegation *delegation) | |
655 | { | |
656 | set_bit(NFS_DELEGATION_REVOKED, &delegation->flags); | |
059b43e9 | 657 | delegation->stateid.type = NFS4_INVALID_STATEID_TYPE; |
41020b67 TM |
658 | nfs_mark_return_delegation(server, delegation); |
659 | } | |
660 | ||
661 | static bool nfs_revoke_delegation(struct inode *inode, | |
662 | const nfs4_stateid *stateid) | |
869f9dfa TM |
663 | { |
664 | struct nfs_delegation *delegation; | |
7f048831 | 665 | nfs4_stateid tmp; |
41020b67 TM |
666 | bool ret = false; |
667 | ||
869f9dfa TM |
668 | rcu_read_lock(); |
669 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
41020b67 TM |
670 | if (delegation == NULL) |
671 | goto out; | |
7f048831 TM |
672 | if (stateid == NULL) { |
673 | nfs4_stateid_copy(&tmp, &delegation->stateid); | |
674 | stateid = &tmp; | |
675 | } else if (!nfs4_stateid_match(stateid, &delegation->stateid)) | |
41020b67 TM |
676 | goto out; |
677 | nfs_mark_delegation_revoked(NFS_SERVER(inode), delegation); | |
678 | ret = true; | |
679 | out: | |
869f9dfa | 680 | rcu_read_unlock(); |
7f048831 TM |
681 | if (ret) |
682 | nfs_inode_find_state_and_recover(inode, stateid); | |
41020b67 | 683 | return ret; |
869f9dfa TM |
684 | } |
685 | ||
41020b67 TM |
686 | void nfs_remove_bad_delegation(struct inode *inode, |
687 | const nfs4_stateid *stateid) | |
a1d0b5ee TM |
688 | { |
689 | struct nfs_delegation *delegation; | |
690 | ||
41020b67 TM |
691 | if (!nfs_revoke_delegation(inode, stateid)) |
692 | return; | |
d25be546 | 693 | delegation = nfs_inode_detach_delegation(inode); |
7f048831 | 694 | if (delegation) |
a1d0b5ee | 695 | nfs_free_delegation(delegation); |
a1d0b5ee | 696 | } |
9cb81968 | 697 | EXPORT_SYMBOL_GPL(nfs_remove_bad_delegation); |
a1d0b5ee | 698 | |
d3978bb3 | 699 | /** |
826e0013 | 700 | * nfs_expire_unused_delegation_types |
d3978bb3 CL |
701 | * @clp: client to process |
702 | * @flags: delegation types to expire | |
703 | * | |
704 | */ | |
826e0013 | 705 | void nfs_expire_unused_delegation_types(struct nfs_client *clp, fmode_t flags) |
58d9714a | 706 | { |
826e0013 | 707 | nfs_client_mark_return_unused_delegation_types(clp, flags); |
b0d3ded1 | 708 | nfs_delegation_run_state_manager(clp); |
58d9714a TM |
709 | } |
710 | ||
d3978bb3 | 711 | static void nfs_mark_return_unreferenced_delegations(struct nfs_server *server) |
b7391f44 TM |
712 | { |
713 | struct nfs_delegation *delegation; | |
714 | ||
d3978bb3 | 715 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { |
b7391f44 TM |
716 | if (test_and_clear_bit(NFS_DELEGATION_REFERENCED, &delegation->flags)) |
717 | continue; | |
b757144f | 718 | nfs_mark_return_if_closed_delegation(server, delegation); |
b7391f44 | 719 | } |
b7391f44 TM |
720 | } |
721 | ||
d3978bb3 CL |
722 | /** |
723 | * nfs_expire_unreferenced_delegations - Eliminate unused delegations | |
724 | * @clp: nfs_client to process | |
725 | * | |
726 | */ | |
b7391f44 TM |
727 | void nfs_expire_unreferenced_delegations(struct nfs_client *clp) |
728 | { | |
d3978bb3 CL |
729 | struct nfs_server *server; |
730 | ||
731 | rcu_read_lock(); | |
732 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
733 | nfs_mark_return_unreferenced_delegations(server); | |
734 | rcu_read_unlock(); | |
735 | ||
b7391f44 TM |
736 | nfs_delegation_run_state_manager(clp); |
737 | } | |
738 | ||
d3978bb3 CL |
739 | /** |
740 | * nfs_async_inode_return_delegation - asynchronously return a delegation | |
741 | * @inode: inode to process | |
8e663f0e | 742 | * @stateid: state ID information |
d3978bb3 CL |
743 | * |
744 | * Returns zero on success, or a negative errno value. | |
1da177e4 | 745 | */ |
d3978bb3 CL |
746 | int nfs_async_inode_return_delegation(struct inode *inode, |
747 | const nfs4_stateid *stateid) | |
1da177e4 | 748 | { |
ed1e6211 TM |
749 | struct nfs_server *server = NFS_SERVER(inode); |
750 | struct nfs_client *clp = server->nfs_client; | |
6411bd4a | 751 | struct nfs_delegation *delegation; |
1da177e4 | 752 | |
6411bd4a TM |
753 | rcu_read_lock(); |
754 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
755a48a7 TM |
755 | if (delegation == NULL) |
756 | goto out_enoent; | |
4816fdad TM |
757 | if (stateid != NULL && |
758 | !clp->cl_mvops->match_stateid(&delegation->stateid, stateid)) | |
755a48a7 | 759 | goto out_enoent; |
ed1e6211 | 760 | nfs_mark_return_delegation(server, delegation); |
6411bd4a | 761 | rcu_read_unlock(); |
d3978bb3 | 762 | |
6411bd4a TM |
763 | nfs_delegation_run_state_manager(clp); |
764 | return 0; | |
755a48a7 TM |
765 | out_enoent: |
766 | rcu_read_unlock(); | |
767 | return -ENOENT; | |
1da177e4 LT |
768 | } |
769 | ||
d3978bb3 CL |
770 | static struct inode * |
771 | nfs_delegation_find_inode_server(struct nfs_server *server, | |
772 | const struct nfs_fh *fhandle) | |
1da177e4 LT |
773 | { |
774 | struct nfs_delegation *delegation; | |
775 | struct inode *res = NULL; | |
d3978bb3 CL |
776 | |
777 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { | |
86e89489 TM |
778 | spin_lock(&delegation->lock); |
779 | if (delegation->inode != NULL && | |
780 | nfs_compare_fh(fhandle, &NFS_I(delegation->inode)->fh) == 0) { | |
1da177e4 | 781 | res = igrab(delegation->inode); |
1da177e4 | 782 | } |
86e89489 TM |
783 | spin_unlock(&delegation->lock); |
784 | if (res != NULL) | |
785 | break; | |
1da177e4 | 786 | } |
d3978bb3 CL |
787 | return res; |
788 | } | |
789 | ||
790 | /** | |
791 | * nfs_delegation_find_inode - retrieve the inode associated with a delegation | |
792 | * @clp: client state handle | |
793 | * @fhandle: filehandle from a delegation recall | |
794 | * | |
795 | * Returns pointer to inode matching "fhandle," or NULL if a matching inode | |
796 | * cannot be found. | |
797 | */ | |
798 | struct inode *nfs_delegation_find_inode(struct nfs_client *clp, | |
799 | const struct nfs_fh *fhandle) | |
800 | { | |
801 | struct nfs_server *server; | |
802 | struct inode *res = NULL; | |
803 | ||
804 | rcu_read_lock(); | |
805 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { | |
806 | res = nfs_delegation_find_inode_server(server, fhandle); | |
807 | if (res != NULL) | |
808 | break; | |
809 | } | |
8383e460 | 810 | rcu_read_unlock(); |
1da177e4 LT |
811 | return res; |
812 | } | |
813 | ||
d3978bb3 CL |
814 | static void nfs_delegation_mark_reclaim_server(struct nfs_server *server) |
815 | { | |
816 | struct nfs_delegation *delegation; | |
817 | ||
45870d69 TM |
818 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { |
819 | /* | |
820 | * If the delegation may have been admin revoked, then we | |
821 | * cannot reclaim it. | |
822 | */ | |
823 | if (test_bit(NFS_DELEGATION_TEST_EXPIRED, &delegation->flags)) | |
824 | continue; | |
d3978bb3 | 825 | set_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags); |
45870d69 | 826 | } |
d3978bb3 CL |
827 | } |
828 | ||
829 | /** | |
830 | * nfs_delegation_mark_reclaim - mark all delegations as needing to be reclaimed | |
831 | * @clp: nfs_client to process | |
832 | * | |
1da177e4 | 833 | */ |
adfa6f98 | 834 | void nfs_delegation_mark_reclaim(struct nfs_client *clp) |
1da177e4 | 835 | { |
d3978bb3 CL |
836 | struct nfs_server *server; |
837 | ||
8383e460 | 838 | rcu_read_lock(); |
d3978bb3 CL |
839 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) |
840 | nfs_delegation_mark_reclaim_server(server); | |
8383e460 | 841 | rcu_read_unlock(); |
1da177e4 LT |
842 | } |
843 | ||
d3978bb3 CL |
844 | /** |
845 | * nfs_delegation_reap_unclaimed - reap unclaimed delegations after reboot recovery is done | |
846 | * @clp: nfs_client to process | |
847 | * | |
1da177e4 | 848 | */ |
adfa6f98 | 849 | void nfs_delegation_reap_unclaimed(struct nfs_client *clp) |
1da177e4 | 850 | { |
8383e460 | 851 | struct nfs_delegation *delegation; |
d3978bb3 | 852 | struct nfs_server *server; |
86e89489 | 853 | struct inode *inode; |
d3978bb3 | 854 | |
8383e460 TM |
855 | restart: |
856 | rcu_read_lock(); | |
d3978bb3 CL |
857 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { |
858 | list_for_each_entry_rcu(delegation, &server->delegations, | |
859 | super_list) { | |
ec3ca4e5 TM |
860 | if (test_bit(NFS_DELEGATION_RETURNING, |
861 | &delegation->flags)) | |
862 | continue; | |
d3978bb3 CL |
863 | if (test_bit(NFS_DELEGATION_NEED_RECLAIM, |
864 | &delegation->flags) == 0) | |
865 | continue; | |
9f0f8e12 | 866 | if (!nfs_sb_active(server->super)) |
d3978bb3 | 867 | continue; |
9f0f8e12 TM |
868 | inode = nfs_delegation_grab_inode(delegation); |
869 | if (inode == NULL) { | |
870 | rcu_read_unlock(); | |
871 | nfs_sb_deactive(server->super); | |
872 | goto restart; | |
873 | } | |
b04b22f4 | 874 | delegation = nfs_start_delegation_return_locked(NFS_I(inode)); |
d3978bb3 | 875 | rcu_read_unlock(); |
b04b22f4 TM |
876 | if (delegation != NULL) { |
877 | delegation = nfs_detach_delegation(NFS_I(inode), | |
878 | delegation, server); | |
879 | if (delegation != NULL) | |
880 | nfs_free_delegation(delegation); | |
881 | } | |
d3978bb3 | 882 | iput(inode); |
9f0f8e12 | 883 | nfs_sb_deactive(server->super); |
d3978bb3 CL |
884 | goto restart; |
885 | } | |
1da177e4 | 886 | } |
8383e460 | 887 | rcu_read_unlock(); |
1da177e4 | 888 | } |
3e4f6290 | 889 | |
bb3d1a3b TM |
890 | static inline bool nfs4_server_rebooted(const struct nfs_client *clp) |
891 | { | |
892 | return (clp->cl_state & (BIT(NFS4CLNT_CHECK_LEASE) | | |
893 | BIT(NFS4CLNT_LEASE_EXPIRED) | | |
894 | BIT(NFS4CLNT_SESSION_RESET))) != 0; | |
895 | } | |
896 | ||
45870d69 TM |
897 | static void nfs_mark_test_expired_delegation(struct nfs_server *server, |
898 | struct nfs_delegation *delegation) | |
899 | { | |
059b43e9 TM |
900 | if (delegation->stateid.type == NFS4_INVALID_STATEID_TYPE) |
901 | return; | |
45870d69 TM |
902 | clear_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags); |
903 | set_bit(NFS_DELEGATION_TEST_EXPIRED, &delegation->flags); | |
904 | set_bit(NFS4CLNT_DELEGATION_EXPIRED, &server->nfs_client->cl_state); | |
905 | } | |
906 | ||
bb3d1a3b TM |
907 | static void nfs_inode_mark_test_expired_delegation(struct nfs_server *server, |
908 | struct inode *inode) | |
909 | { | |
910 | struct nfs_delegation *delegation; | |
911 | ||
912 | rcu_read_lock(); | |
913 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
914 | if (delegation) | |
915 | nfs_mark_test_expired_delegation(server, delegation); | |
916 | rcu_read_unlock(); | |
917 | ||
918 | } | |
919 | ||
45870d69 TM |
920 | static void nfs_delegation_mark_test_expired_server(struct nfs_server *server) |
921 | { | |
922 | struct nfs_delegation *delegation; | |
923 | ||
924 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) | |
925 | nfs_mark_test_expired_delegation(server, delegation); | |
926 | } | |
927 | ||
928 | /** | |
929 | * nfs_mark_test_expired_all_delegations - mark all delegations for testing | |
930 | * @clp: nfs_client to process | |
931 | * | |
932 | * Iterates through all the delegations associated with this server and | |
933 | * marks them as needing to be checked for validity. | |
934 | */ | |
935 | void nfs_mark_test_expired_all_delegations(struct nfs_client *clp) | |
936 | { | |
937 | struct nfs_server *server; | |
938 | ||
939 | rcu_read_lock(); | |
940 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
941 | nfs_delegation_mark_test_expired_server(server); | |
942 | rcu_read_unlock(); | |
943 | } | |
944 | ||
945 | /** | |
946 | * nfs_reap_expired_delegations - reap expired delegations | |
947 | * @clp: nfs_client to process | |
948 | * | |
949 | * Iterates through all the delegations associated with this server and | |
950 | * checks if they have may have been revoked. This function is usually | |
951 | * expected to be called in cases where the server may have lost its | |
952 | * lease. | |
953 | */ | |
954 | void nfs_reap_expired_delegations(struct nfs_client *clp) | |
955 | { | |
956 | const struct nfs4_minor_version_ops *ops = clp->cl_mvops; | |
957 | struct nfs_delegation *delegation; | |
958 | struct nfs_server *server; | |
959 | struct inode *inode; | |
960 | struct rpc_cred *cred; | |
961 | nfs4_stateid stateid; | |
962 | ||
963 | restart: | |
964 | rcu_read_lock(); | |
965 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { | |
966 | list_for_each_entry_rcu(delegation, &server->delegations, | |
967 | super_list) { | |
968 | if (test_bit(NFS_DELEGATION_RETURNING, | |
969 | &delegation->flags)) | |
970 | continue; | |
971 | if (test_bit(NFS_DELEGATION_TEST_EXPIRED, | |
972 | &delegation->flags) == 0) | |
973 | continue; | |
974 | if (!nfs_sb_active(server->super)) | |
975 | continue; | |
976 | inode = nfs_delegation_grab_inode(delegation); | |
977 | if (inode == NULL) { | |
978 | rcu_read_unlock(); | |
979 | nfs_sb_deactive(server->super); | |
980 | goto restart; | |
981 | } | |
982 | cred = get_rpccred_rcu(delegation->cred); | |
983 | nfs4_stateid_copy(&stateid, &delegation->stateid); | |
984 | clear_bit(NFS_DELEGATION_TEST_EXPIRED, &delegation->flags); | |
985 | rcu_read_unlock(); | |
986 | if (cred != NULL && | |
987 | ops->test_and_free_expired(server, &stateid, cred) < 0) { | |
988 | nfs_revoke_delegation(inode, &stateid); | |
989 | nfs_inode_find_state_and_recover(inode, &stateid); | |
990 | } | |
991 | put_rpccred(cred); | |
bb3d1a3b TM |
992 | if (nfs4_server_rebooted(clp)) { |
993 | nfs_inode_mark_test_expired_delegation(server,inode); | |
994 | iput(inode); | |
995 | nfs_sb_deactive(server->super); | |
996 | return; | |
997 | } | |
45870d69 TM |
998 | iput(inode); |
999 | nfs_sb_deactive(server->super); | |
1000 | goto restart; | |
1001 | } | |
1002 | } | |
1003 | rcu_read_unlock(); | |
1004 | } | |
1005 | ||
6c2d8f8d TM |
1006 | void nfs_inode_find_delegation_state_and_recover(struct inode *inode, |
1007 | const nfs4_stateid *stateid) | |
1008 | { | |
1009 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; | |
1010 | struct nfs_delegation *delegation; | |
1011 | bool found = false; | |
1012 | ||
1013 | rcu_read_lock(); | |
1014 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
1015 | if (delegation && | |
1016 | nfs4_stateid_match_other(&delegation->stateid, stateid)) { | |
1017 | nfs_mark_test_expired_delegation(NFS_SERVER(inode), delegation); | |
1018 | found = true; | |
1019 | } | |
1020 | rcu_read_unlock(); | |
1021 | if (found) | |
1022 | nfs4_schedule_state_manager(clp); | |
1023 | } | |
1024 | ||
d3978bb3 CL |
1025 | /** |
1026 | * nfs_delegations_present - check for existence of delegations | |
1027 | * @clp: client state handle | |
1028 | * | |
1029 | * Returns one if there are any nfs_delegation structures attached | |
1030 | * to this nfs_client. | |
1031 | */ | |
1032 | int nfs_delegations_present(struct nfs_client *clp) | |
1033 | { | |
1034 | struct nfs_server *server; | |
1035 | int ret = 0; | |
1036 | ||
1037 | rcu_read_lock(); | |
1038 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
1039 | if (!list_empty(&server->delegations)) { | |
1040 | ret = 1; | |
1041 | break; | |
1042 | } | |
1043 | rcu_read_unlock(); | |
1044 | return ret; | |
1045 | } | |
1046 | ||
1047 | /** | |
1048 | * nfs4_copy_delegation_stateid - Copy inode's state ID information | |
d3978bb3 | 1049 | * @inode: inode to check |
0032a7a7 | 1050 | * @flags: delegation type requirement |
abf4e13c TM |
1051 | * @dst: stateid data structure to fill in |
1052 | * @cred: optional argument to retrieve credential | |
d3978bb3 | 1053 | * |
0032a7a7 TM |
1054 | * Returns "true" and fills in "dst->data" * if inode had a delegation, |
1055 | * otherwise "false" is returned. | |
d3978bb3 | 1056 | */ |
abf4e13c TM |
1057 | bool nfs4_copy_delegation_stateid(struct inode *inode, fmode_t flags, |
1058 | nfs4_stateid *dst, struct rpc_cred **cred) | |
3e4f6290 | 1059 | { |
3e4f6290 TM |
1060 | struct nfs_inode *nfsi = NFS_I(inode); |
1061 | struct nfs_delegation *delegation; | |
0032a7a7 | 1062 | bool ret; |
3e4f6290 | 1063 | |
0032a7a7 | 1064 | flags &= FMODE_READ|FMODE_WRITE; |
8383e460 TM |
1065 | rcu_read_lock(); |
1066 | delegation = rcu_dereference(nfsi->delegation); | |
aa05c87f | 1067 | ret = nfs4_is_valid_delegation(delegation, flags); |
0032a7a7 | 1068 | if (ret) { |
f597c537 | 1069 | nfs4_stateid_copy(dst, &delegation->stateid); |
0032a7a7 | 1070 | nfs_mark_delegation_referenced(delegation); |
abf4e13c TM |
1071 | if (cred) |
1072 | *cred = get_rpccred(delegation->cred); | |
3e4f6290 | 1073 | } |
8383e460 TM |
1074 | rcu_read_unlock(); |
1075 | return ret; | |
3e4f6290 | 1076 | } |
5445b1fb TM |
1077 | |
1078 | /** | |
1079 | * nfs4_delegation_flush_on_close - Check if we must flush file on close | |
1080 | * @inode: inode to check | |
1081 | * | |
1082 | * This function checks the number of outstanding writes to the file | |
1083 | * against the delegation 'space_limit' field to see if | |
1084 | * the spec requires us to flush the file on close. | |
1085 | */ | |
1086 | bool nfs4_delegation_flush_on_close(const struct inode *inode) | |
1087 | { | |
1088 | struct nfs_inode *nfsi = NFS_I(inode); | |
1089 | struct nfs_delegation *delegation; | |
1090 | bool ret = true; | |
1091 | ||
1092 | rcu_read_lock(); | |
1093 | delegation = rcu_dereference(nfsi->delegation); | |
1094 | if (delegation == NULL || !(delegation->type & FMODE_WRITE)) | |
1095 | goto out; | |
1096 | if (nfsi->nrequests < delegation->pagemod_limit) | |
1097 | ret = false; | |
1098 | out: | |
1099 | rcu_read_unlock(); | |
1100 | return ret; | |
1101 | } |