Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/nfs/delegation.c | |
3 | * | |
4 | * Copyright (C) 2004 Trond Myklebust | |
5 | * | |
6 | * NFS file delegation management | |
7 | * | |
8 | */ | |
1da177e4 | 9 | #include <linux/completion.h> |
58d9714a | 10 | #include <linux/kthread.h> |
1da177e4 LT |
11 | #include <linux/module.h> |
12 | #include <linux/sched.h> | |
5a0e3ad6 | 13 | #include <linux/slab.h> |
1da177e4 | 14 | #include <linux/spinlock.h> |
1eb5d98f | 15 | #include <linux/iversion.h> |
1da177e4 LT |
16 | |
17 | #include <linux/nfs4.h> | |
18 | #include <linux/nfs_fs.h> | |
19 | #include <linux/nfs_xdr.h> | |
20 | ||
4ce79717 | 21 | #include "nfs4_fs.h" |
c01d3645 | 22 | #include "nfs4session.h" |
1da177e4 | 23 | #include "delegation.h" |
24c8dbbb | 24 | #include "internal.h" |
ca8acf8d | 25 | #include "nfs4trace.h" |
1da177e4 | 26 | |
905f8d16 TM |
27 | static void nfs_free_delegation(struct nfs_delegation *delegation) |
28 | { | |
e00b8a24 TM |
29 | if (delegation->cred) { |
30 | put_rpccred(delegation->cred); | |
31 | delegation->cred = NULL; | |
32 | } | |
26f04dde | 33 | kfree_rcu(delegation, rcu); |
8383e460 TM |
34 | } |
35 | ||
d3978bb3 CL |
36 | /** |
37 | * nfs_mark_delegation_referenced - set delegation's REFERENCED flag | |
38 | * @delegation: delegation to process | |
39 | * | |
40 | */ | |
b7391f44 TM |
41 | void nfs_mark_delegation_referenced(struct nfs_delegation *delegation) |
42 | { | |
43 | set_bit(NFS_DELEGATION_REFERENCED, &delegation->flags); | |
44 | } | |
45 | ||
aa05c87f TM |
46 | static bool |
47 | nfs4_is_valid_delegation(const struct nfs_delegation *delegation, | |
48 | fmode_t flags) | |
49 | { | |
50 | if (delegation != NULL && (delegation->type & flags) == flags && | |
51 | !test_bit(NFS_DELEGATION_REVOKED, &delegation->flags) && | |
52 | !test_bit(NFS_DELEGATION_RETURNING, &delegation->flags)) | |
53 | return true; | |
54 | return false; | |
55 | } | |
56 | ||
15bb3afe PT |
57 | static int |
58 | nfs4_do_check_delegation(struct inode *inode, fmode_t flags, bool mark) | |
b7391f44 TM |
59 | { |
60 | struct nfs_delegation *delegation; | |
61 | int ret = 0; | |
62 | ||
63 | flags &= FMODE_READ|FMODE_WRITE; | |
64 | rcu_read_lock(); | |
65 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
aa05c87f | 66 | if (nfs4_is_valid_delegation(delegation, flags)) { |
15bb3afe PT |
67 | if (mark) |
68 | nfs_mark_delegation_referenced(delegation); | |
b7391f44 TM |
69 | ret = 1; |
70 | } | |
71 | rcu_read_unlock(); | |
72 | return ret; | |
73 | } | |
15bb3afe PT |
74 | /** |
75 | * nfs_have_delegation - check if inode has a delegation, mark it | |
76 | * NFS_DELEGATION_REFERENCED if there is one. | |
77 | * @inode: inode to check | |
78 | * @flags: delegation types to check for | |
79 | * | |
80 | * Returns one if inode has the indicated delegation, otherwise zero. | |
81 | */ | |
82 | int nfs4_have_delegation(struct inode *inode, fmode_t flags) | |
83 | { | |
84 | return nfs4_do_check_delegation(inode, flags, true); | |
85 | } | |
86 | ||
87 | /* | |
88 | * nfs4_check_delegation - check if inode has a delegation, do not mark | |
89 | * NFS_DELEGATION_REFERENCED if it has one. | |
90 | */ | |
91 | int nfs4_check_delegation(struct inode *inode, fmode_t flags) | |
92 | { | |
93 | return nfs4_do_check_delegation(inode, flags, false); | |
94 | } | |
b7391f44 | 95 | |
db4f2e63 | 96 | static int nfs_delegation_claim_locks(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid) |
888e694c TM |
97 | { |
98 | struct inode *inode = state->inode; | |
99 | struct file_lock *fl; | |
bd61e0a9 JL |
100 | struct file_lock_context *flctx = inode->i_flctx; |
101 | struct list_head *list; | |
d5122201 | 102 | int status = 0; |
888e694c | 103 | |
bd61e0a9 | 104 | if (flctx == NULL) |
65b62a29 | 105 | goto out; |
314d7cc0 | 106 | |
bd61e0a9 | 107 | list = &flctx->flc_posix; |
6109c850 | 108 | spin_lock(&flctx->flc_lock); |
bd61e0a9 JL |
109 | restart: |
110 | list_for_each_entry(fl, list, fl_list) { | |
cd3758e3 | 111 | if (nfs_file_open_context(fl->fl_file) != ctx) |
888e694c | 112 | continue; |
6109c850 | 113 | spin_unlock(&flctx->flc_lock); |
db4f2e63 | 114 | status = nfs4_lock_delegation_recall(fl, state, stateid); |
d5122201 | 115 | if (status < 0) |
3f09df70 | 116 | goto out; |
6109c850 | 117 | spin_lock(&flctx->flc_lock); |
888e694c | 118 | } |
bd61e0a9 JL |
119 | if (list == &flctx->flc_posix) { |
120 | list = &flctx->flc_flock; | |
121 | goto restart; | |
888e694c | 122 | } |
6109c850 | 123 | spin_unlock(&flctx->flc_lock); |
3f09df70 | 124 | out: |
888e694c TM |
125 | return status; |
126 | } | |
127 | ||
24311f88 TM |
128 | static int nfs_delegation_claim_opens(struct inode *inode, |
129 | const nfs4_stateid *stateid, fmode_t type) | |
1da177e4 LT |
130 | { |
131 | struct nfs_inode *nfsi = NFS_I(inode); | |
132 | struct nfs_open_context *ctx; | |
d25be546 | 133 | struct nfs4_state_owner *sp; |
1da177e4 | 134 | struct nfs4_state *state; |
d25be546 | 135 | unsigned int seq; |
888e694c | 136 | int err; |
1da177e4 LT |
137 | |
138 | again: | |
139 | spin_lock(&inode->i_lock); | |
140 | list_for_each_entry(ctx, &nfsi->open_files, list) { | |
141 | state = ctx->state; | |
142 | if (state == NULL) | |
143 | continue; | |
144 | if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) | |
145 | continue; | |
f8ebf7a8 TM |
146 | if (!nfs4_valid_open_stateid(state)) |
147 | continue; | |
f597c537 | 148 | if (!nfs4_stateid_match(&state->stateid, stateid)) |
90163027 | 149 | continue; |
1da177e4 LT |
150 | get_nfs_open_context(ctx); |
151 | spin_unlock(&inode->i_lock); | |
d25be546 | 152 | sp = state->owner; |
65b62a29 TM |
153 | /* Block nfs4_proc_unlck */ |
154 | mutex_lock(&sp->so_delegreturn_mutex); | |
d25be546 | 155 | seq = raw_seqcount_begin(&sp->so_reclaim_seqcount); |
24311f88 | 156 | err = nfs4_open_delegation_recall(ctx, state, stateid, type); |
d25be546 | 157 | if (!err) |
db4f2e63 | 158 | err = nfs_delegation_claim_locks(ctx, state, stateid); |
d25be546 TM |
159 | if (!err && read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) |
160 | err = -EAGAIN; | |
65b62a29 | 161 | mutex_unlock(&sp->so_delegreturn_mutex); |
1da177e4 | 162 | put_nfs_open_context(ctx); |
888e694c | 163 | if (err != 0) |
d18cc1fd | 164 | return err; |
1da177e4 LT |
165 | goto again; |
166 | } | |
167 | spin_unlock(&inode->i_lock); | |
d18cc1fd | 168 | return 0; |
1da177e4 LT |
169 | } |
170 | ||
d3978bb3 CL |
171 | /** |
172 | * nfs_inode_reclaim_delegation - process a delegation reclaim request | |
173 | * @inode: inode to process | |
174 | * @cred: credential to use for request | |
35156bff TM |
175 | * @type: delegation type |
176 | * @stateid: delegation stateid | |
177 | * @pagemod_limit: write delegation "space_limit" | |
d3978bb3 | 178 | * |
1da177e4 | 179 | */ |
d3978bb3 | 180 | void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, |
35156bff TM |
181 | fmode_t type, |
182 | const nfs4_stateid *stateid, | |
183 | unsigned long pagemod_limit) | |
1da177e4 | 184 | { |
8f649c37 TM |
185 | struct nfs_delegation *delegation; |
186 | struct rpc_cred *oldcred = NULL; | |
1da177e4 | 187 | |
8f649c37 TM |
188 | rcu_read_lock(); |
189 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
190 | if (delegation != NULL) { | |
191 | spin_lock(&delegation->lock); | |
192 | if (delegation->inode != NULL) { | |
35156bff TM |
193 | nfs4_stateid_copy(&delegation->stateid, stateid); |
194 | delegation->type = type; | |
195 | delegation->pagemod_limit = pagemod_limit; | |
8f649c37 TM |
196 | oldcred = delegation->cred; |
197 | delegation->cred = get_rpccred(cred); | |
198 | clear_bit(NFS_DELEGATION_NEED_RECLAIM, | |
199 | &delegation->flags); | |
8f649c37 | 200 | spin_unlock(&delegation->lock); |
8f649c37 | 201 | rcu_read_unlock(); |
7c0af9ff | 202 | put_rpccred(oldcred); |
35156bff | 203 | trace_nfs4_reclaim_delegation(inode, type); |
b1a318de | 204 | return; |
8f649c37 | 205 | } |
b1a318de TM |
206 | /* We appear to have raced with a delegation return. */ |
207 | spin_unlock(&delegation->lock); | |
8f649c37 | 208 | } |
b1a318de | 209 | rcu_read_unlock(); |
35156bff | 210 | nfs_inode_set_delegation(inode, cred, type, stateid, pagemod_limit); |
1da177e4 LT |
211 | } |
212 | ||
57bfa891 TM |
213 | static int nfs_do_return_delegation(struct inode *inode, struct nfs_delegation *delegation, int issync) |
214 | { | |
215 | int res = 0; | |
216 | ||
869f9dfa TM |
217 | if (!test_bit(NFS_DELEGATION_REVOKED, &delegation->flags)) |
218 | res = nfs4_proc_delegreturn(inode, | |
219 | delegation->cred, | |
220 | &delegation->stateid, | |
221 | issync); | |
57bfa891 TM |
222 | nfs_free_delegation(delegation); |
223 | return res; | |
224 | } | |
225 | ||
86e89489 TM |
226 | static struct inode *nfs_delegation_grab_inode(struct nfs_delegation *delegation) |
227 | { | |
228 | struct inode *inode = NULL; | |
229 | ||
230 | spin_lock(&delegation->lock); | |
231 | if (delegation->inode != NULL) | |
232 | inode = igrab(delegation->inode); | |
233 | spin_unlock(&delegation->lock); | |
234 | return inode; | |
235 | } | |
236 | ||
d25be546 TM |
237 | static struct nfs_delegation * |
238 | nfs_start_delegation_return_locked(struct nfs_inode *nfsi) | |
239 | { | |
240 | struct nfs_delegation *ret = NULL; | |
241 | struct nfs_delegation *delegation = rcu_dereference(nfsi->delegation); | |
242 | ||
243 | if (delegation == NULL) | |
244 | goto out; | |
245 | spin_lock(&delegation->lock); | |
246 | if (!test_and_set_bit(NFS_DELEGATION_RETURNING, &delegation->flags)) | |
247 | ret = delegation; | |
248 | spin_unlock(&delegation->lock); | |
249 | out: | |
250 | return ret; | |
251 | } | |
252 | ||
253 | static struct nfs_delegation * | |
254 | nfs_start_delegation_return(struct nfs_inode *nfsi) | |
255 | { | |
256 | struct nfs_delegation *delegation; | |
257 | ||
258 | rcu_read_lock(); | |
259 | delegation = nfs_start_delegation_return_locked(nfsi); | |
260 | rcu_read_unlock(); | |
261 | return delegation; | |
262 | } | |
263 | ||
264 | static void | |
265 | nfs_abort_delegation_return(struct nfs_delegation *delegation, | |
266 | struct nfs_client *clp) | |
267 | { | |
268 | ||
269 | spin_lock(&delegation->lock); | |
270 | clear_bit(NFS_DELEGATION_RETURNING, &delegation->flags); | |
271 | set_bit(NFS_DELEGATION_RETURN, &delegation->flags); | |
272 | spin_unlock(&delegation->lock); | |
273 | set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state); | |
274 | } | |
275 | ||
dda4b225 CL |
276 | static struct nfs_delegation * |
277 | nfs_detach_delegation_locked(struct nfs_inode *nfsi, | |
d25be546 TM |
278 | struct nfs_delegation *delegation, |
279 | struct nfs_client *clp) | |
57bfa891 | 280 | { |
d25be546 | 281 | struct nfs_delegation *deleg_cur = |
17d2c0a0 | 282 | rcu_dereference_protected(nfsi->delegation, |
d25be546 | 283 | lockdep_is_held(&clp->cl_lock)); |
57bfa891 | 284 | |
d25be546 TM |
285 | if (deleg_cur == NULL || delegation != deleg_cur) |
286 | return NULL; | |
dda4b225 | 287 | |
34310430 | 288 | spin_lock(&delegation->lock); |
d25be546 | 289 | set_bit(NFS_DELEGATION_RETURNING, &delegation->flags); |
57bfa891 | 290 | list_del_rcu(&delegation->super_list); |
86e89489 | 291 | delegation->inode = NULL; |
57bfa891 | 292 | rcu_assign_pointer(nfsi->delegation, NULL); |
34310430 | 293 | spin_unlock(&delegation->lock); |
57bfa891 | 294 | return delegation; |
57bfa891 TM |
295 | } |
296 | ||
dda4b225 | 297 | static struct nfs_delegation *nfs_detach_delegation(struct nfs_inode *nfsi, |
d25be546 TM |
298 | struct nfs_delegation *delegation, |
299 | struct nfs_server *server) | |
dda4b225 | 300 | { |
d3978bb3 | 301 | struct nfs_client *clp = server->nfs_client; |
dda4b225 CL |
302 | |
303 | spin_lock(&clp->cl_lock); | |
d25be546 | 304 | delegation = nfs_detach_delegation_locked(nfsi, delegation, clp); |
dda4b225 CL |
305 | spin_unlock(&clp->cl_lock); |
306 | return delegation; | |
307 | } | |
308 | ||
d25be546 TM |
309 | static struct nfs_delegation * |
310 | nfs_inode_detach_delegation(struct inode *inode) | |
311 | { | |
312 | struct nfs_inode *nfsi = NFS_I(inode); | |
313 | struct nfs_server *server = NFS_SERVER(inode); | |
314 | struct nfs_delegation *delegation; | |
315 | ||
316 | delegation = nfs_start_delegation_return(nfsi); | |
317 | if (delegation == NULL) | |
318 | return NULL; | |
319 | return nfs_detach_delegation(nfsi, delegation, server); | |
320 | } | |
321 | ||
cf6726e2 TM |
322 | static void |
323 | nfs_update_inplace_delegation(struct nfs_delegation *delegation, | |
324 | const struct nfs_delegation *update) | |
325 | { | |
326 | if (nfs4_stateid_is_newer(&update->stateid, &delegation->stateid)) { | |
327 | delegation->stateid.seqid = update->stateid.seqid; | |
328 | smp_wmb(); | |
329 | delegation->type = update->type; | |
330 | } | |
331 | } | |
332 | ||
d3978bb3 CL |
333 | /** |
334 | * nfs_inode_set_delegation - set up a delegation on an inode | |
335 | * @inode: inode to which delegation applies | |
336 | * @cred: cred to use for subsequent delegation processing | |
35156bff TM |
337 | * @type: delegation type |
338 | * @stateid: delegation stateid | |
339 | * @pagemod_limit: write delegation "space_limit" | |
d3978bb3 CL |
340 | * |
341 | * Returns zero on success, or a negative errno value. | |
1da177e4 | 342 | */ |
35156bff TM |
343 | int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, |
344 | fmode_t type, | |
345 | const nfs4_stateid *stateid, | |
346 | unsigned long pagemod_limit) | |
1da177e4 | 347 | { |
d3978bb3 CL |
348 | struct nfs_server *server = NFS_SERVER(inode); |
349 | struct nfs_client *clp = server->nfs_client; | |
1da177e4 | 350 | struct nfs_inode *nfsi = NFS_I(inode); |
17d2c0a0 | 351 | struct nfs_delegation *delegation, *old_delegation; |
57bfa891 | 352 | struct nfs_delegation *freeme = NULL; |
1da177e4 LT |
353 | int status = 0; |
354 | ||
8535b2be | 355 | delegation = kmalloc(sizeof(*delegation), GFP_NOFS); |
1da177e4 LT |
356 | if (delegation == NULL) |
357 | return -ENOMEM; | |
35156bff TM |
358 | nfs4_stateid_copy(&delegation->stateid, stateid); |
359 | delegation->type = type; | |
360 | delegation->pagemod_limit = pagemod_limit; | |
1eb5d98f | 361 | delegation->change_attr = inode_peek_iversion_raw(inode); |
1da177e4 LT |
362 | delegation->cred = get_rpccred(cred); |
363 | delegation->inode = inode; | |
b7391f44 | 364 | delegation->flags = 1<<NFS_DELEGATION_REFERENCED; |
34310430 | 365 | spin_lock_init(&delegation->lock); |
1da177e4 LT |
366 | |
367 | spin_lock(&clp->cl_lock); | |
17d2c0a0 | 368 | old_delegation = rcu_dereference_protected(nfsi->delegation, |
d3978bb3 | 369 | lockdep_is_held(&clp->cl_lock)); |
17d2c0a0 | 370 | if (old_delegation != NULL) { |
cf6726e2 TM |
371 | /* Is this an update of the existing delegation? */ |
372 | if (nfs4_stateid_match_other(&old_delegation->stateid, | |
373 | &delegation->stateid)) { | |
374 | nfs_update_inplace_delegation(old_delegation, | |
375 | delegation); | |
57bfa891 | 376 | goto out; |
1da177e4 | 377 | } |
57bfa891 TM |
378 | /* |
379 | * Deal with broken servers that hand out two | |
380 | * delegations for the same file. | |
17280175 TM |
381 | * Allow for upgrades to a WRITE delegation, but |
382 | * nothing else. | |
57bfa891 TM |
383 | */ |
384 | dfprintk(FILE, "%s: server %s handed out " | |
385 | "a duplicate delegation!\n", | |
3110ff80 | 386 | __func__, clp->cl_hostname); |
17280175 TM |
387 | if (delegation->type == old_delegation->type || |
388 | !(delegation->type & FMODE_WRITE)) { | |
57bfa891 TM |
389 | freeme = delegation; |
390 | delegation = NULL; | |
391 | goto out; | |
392 | } | |
ade04647 TM |
393 | if (test_and_set_bit(NFS_DELEGATION_RETURNING, |
394 | &old_delegation->flags)) | |
395 | goto out; | |
396 | freeme = nfs_detach_delegation_locked(nfsi, | |
d25be546 TM |
397 | old_delegation, clp); |
398 | if (freeme == NULL) | |
399 | goto out; | |
1da177e4 | 400 | } |
38942ba2 | 401 | list_add_tail_rcu(&delegation->super_list, &server->delegations); |
57bfa891 TM |
402 | rcu_assign_pointer(nfsi->delegation, delegation); |
403 | delegation = NULL; | |
412c77ce | 404 | |
35156bff | 405 | trace_nfs4_set_delegation(inode, type); |
412c77ce | 406 | |
97c2c17a TM |
407 | spin_lock(&inode->i_lock); |
408 | if (NFS_I(inode)->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ATIME)) | |
409 | NFS_I(inode)->cache_validity |= NFS_INO_REVAL_FORCED; | |
410 | spin_unlock(&inode->i_lock); | |
57bfa891 | 411 | out: |
1da177e4 | 412 | spin_unlock(&clp->cl_lock); |
603c83da TM |
413 | if (delegation != NULL) |
414 | nfs_free_delegation(delegation); | |
57bfa891 TM |
415 | if (freeme != NULL) |
416 | nfs_do_return_delegation(inode, freeme, 0); | |
1da177e4 LT |
417 | return status; |
418 | } | |
419 | ||
1da177e4 LT |
420 | /* |
421 | * Basic procedure for returning a delegation to the server | |
422 | */ | |
d25be546 | 423 | static int nfs_end_delegation_return(struct inode *inode, struct nfs_delegation *delegation, int issync) |
1da177e4 | 424 | { |
d25be546 | 425 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; |
1da177e4 | 426 | struct nfs_inode *nfsi = NFS_I(inode); |
869f9dfa | 427 | int err = 0; |
1da177e4 | 428 | |
d25be546 TM |
429 | if (delegation == NULL) |
430 | return 0; | |
431 | do { | |
869f9dfa TM |
432 | if (test_bit(NFS_DELEGATION_REVOKED, &delegation->flags)) |
433 | break; | |
24311f88 TM |
434 | err = nfs_delegation_claim_opens(inode, &delegation->stateid, |
435 | delegation->type); | |
d25be546 TM |
436 | if (!issync || err != -EAGAIN) |
437 | break; | |
438 | /* | |
439 | * Guard against state recovery | |
440 | */ | |
441 | err = nfs4_wait_clnt_recover(clp); | |
442 | } while (err == 0); | |
443 | ||
444 | if (err) { | |
445 | nfs_abort_delegation_return(delegation, clp); | |
446 | goto out; | |
447 | } | |
448 | if (!nfs_detach_delegation(nfsi, delegation, NFS_SERVER(inode))) | |
d18cc1fd | 449 | goto out; |
1da177e4 | 450 | |
d18cc1fd TM |
451 | err = nfs_do_return_delegation(inode, delegation, issync); |
452 | out: | |
453 | return err; | |
90163027 TM |
454 | } |
455 | ||
b757144f TM |
456 | static bool nfs_delegation_need_return(struct nfs_delegation *delegation) |
457 | { | |
458 | bool ret = false; | |
459 | ||
ec3ca4e5 TM |
460 | if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags)) |
461 | goto out; | |
b757144f TM |
462 | if (test_and_clear_bit(NFS_DELEGATION_RETURN, &delegation->flags)) |
463 | ret = true; | |
464 | if (test_and_clear_bit(NFS_DELEGATION_RETURN_IF_CLOSED, &delegation->flags) && !ret) { | |
465 | struct inode *inode; | |
466 | ||
467 | spin_lock(&delegation->lock); | |
468 | inode = delegation->inode; | |
469 | if (inode && list_empty(&NFS_I(inode)->open_files)) | |
470 | ret = true; | |
471 | spin_unlock(&delegation->lock); | |
472 | } | |
ec3ca4e5 | 473 | out: |
b757144f TM |
474 | return ret; |
475 | } | |
476 | ||
d3978bb3 CL |
477 | /** |
478 | * nfs_client_return_marked_delegations - return previously marked delegations | |
479 | * @clp: nfs_client to process | |
480 | * | |
dc327ed4 TM |
481 | * Note that this function is designed to be called by the state |
482 | * manager thread. For this reason, it cannot flush the dirty data, | |
483 | * since that could deadlock in case of a state recovery error. | |
484 | * | |
d3978bb3 | 485 | * Returns zero on success, or a negative errno value. |
515d8611 | 486 | */ |
d18cc1fd | 487 | int nfs_client_return_marked_delegations(struct nfs_client *clp) |
515d8611 TM |
488 | { |
489 | struct nfs_delegation *delegation; | |
e04bbf6b | 490 | struct nfs_delegation *prev; |
d3978bb3 | 491 | struct nfs_server *server; |
515d8611 | 492 | struct inode *inode; |
e04bbf6b N |
493 | struct inode *place_holder = NULL; |
494 | struct nfs_delegation *place_holder_deleg = NULL; | |
d18cc1fd | 495 | int err = 0; |
515d8611 TM |
496 | |
497 | restart: | |
e04bbf6b N |
498 | /* |
499 | * To avoid quadratic looping we hold a reference | |
500 | * to an inode place_holder. Each time we restart, we | |
501 | * list nfs_servers from the server of that inode, and | |
502 | * delegation in the server from the delegations of that | |
503 | * inode. | |
504 | * prev is an RCU-protected pointer to a delegation which | |
505 | * wasn't marked for return and might be a good choice for | |
506 | * the next place_holder. | |
507 | */ | |
515d8611 | 508 | rcu_read_lock(); |
e04bbf6b N |
509 | prev = NULL; |
510 | if (place_holder) | |
511 | server = NFS_SERVER(place_holder); | |
512 | else | |
513 | server = list_entry_rcu(clp->cl_superblocks.next, | |
514 | struct nfs_server, client_link); | |
515 | list_for_each_entry_from_rcu(server, &clp->cl_superblocks, client_link) { | |
516 | delegation = NULL; | |
517 | if (place_holder && server == NFS_SERVER(place_holder)) | |
518 | delegation = rcu_dereference(NFS_I(place_holder)->delegation); | |
519 | if (!delegation || delegation != place_holder_deleg) | |
520 | delegation = list_entry_rcu(server->delegations.next, | |
521 | struct nfs_delegation, super_list); | |
522 | list_for_each_entry_from_rcu(delegation, &server->delegations, super_list) { | |
523 | struct inode *to_put = NULL; | |
524 | ||
525 | if (!nfs_delegation_need_return(delegation)) { | |
526 | prev = delegation; | |
d3978bb3 | 527 | continue; |
e04bbf6b | 528 | } |
9f0f8e12 | 529 | if (!nfs_sb_active(server->super)) |
f3893491 | 530 | break; /* continue in outer loop */ |
e04bbf6b N |
531 | |
532 | if (prev) { | |
533 | struct inode *tmp; | |
534 | ||
535 | tmp = nfs_delegation_grab_inode(prev); | |
536 | if (tmp) { | |
537 | to_put = place_holder; | |
538 | place_holder = tmp; | |
539 | place_holder_deleg = prev; | |
540 | } | |
541 | } | |
542 | ||
9f0f8e12 TM |
543 | inode = nfs_delegation_grab_inode(delegation); |
544 | if (inode == NULL) { | |
545 | rcu_read_unlock(); | |
e04bbf6b N |
546 | if (to_put) |
547 | iput(to_put); | |
9f0f8e12 TM |
548 | nfs_sb_deactive(server->super); |
549 | goto restart; | |
550 | } | |
d25be546 | 551 | delegation = nfs_start_delegation_return_locked(NFS_I(inode)); |
d3978bb3 CL |
552 | rcu_read_unlock(); |
553 | ||
e04bbf6b N |
554 | if (to_put) |
555 | iput(to_put); | |
556 | ||
d25be546 | 557 | err = nfs_end_delegation_return(inode, delegation, 0); |
d3978bb3 | 558 | iput(inode); |
9f0f8e12 | 559 | nfs_sb_deactive(server->super); |
3ca951b6 | 560 | cond_resched(); |
d3978bb3 CL |
561 | if (!err) |
562 | goto restart; | |
563 | set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state); | |
e04bbf6b N |
564 | if (place_holder) |
565 | iput(place_holder); | |
d3978bb3 | 566 | return err; |
d18cc1fd | 567 | } |
515d8611 TM |
568 | } |
569 | rcu_read_unlock(); | |
e04bbf6b N |
570 | if (place_holder) |
571 | iput(place_holder); | |
d18cc1fd | 572 | return 0; |
515d8611 TM |
573 | } |
574 | ||
d3978bb3 CL |
575 | /** |
576 | * nfs_inode_return_delegation_noreclaim - return delegation, don't reclaim opens | |
577 | * @inode: inode to process | |
578 | * | |
579 | * Does not protect against delegation reclaims, therefore really only safe | |
580 | * to be called from nfs4_clear_inode(). | |
e6f81075 TM |
581 | */ |
582 | void nfs_inode_return_delegation_noreclaim(struct inode *inode) | |
583 | { | |
e6f81075 TM |
584 | struct nfs_delegation *delegation; |
585 | ||
d25be546 TM |
586 | delegation = nfs_inode_detach_delegation(inode); |
587 | if (delegation != NULL) | |
5fcdfacc | 588 | nfs_do_return_delegation(inode, delegation, 1); |
e6f81075 TM |
589 | } |
590 | ||
d3978bb3 CL |
591 | /** |
592 | * nfs_inode_return_delegation - synchronously return a delegation | |
593 | * @inode: inode to process | |
594 | * | |
c57d1bc5 TM |
595 | * This routine will always flush any dirty data to disk on the |
596 | * assumption that if we need to return the delegation, then | |
597 | * we should stop caching. | |
598 | * | |
d3978bb3 CL |
599 | * Returns zero on success, or a negative errno value. |
600 | */ | |
57ec14c5 | 601 | int nfs4_inode_return_delegation(struct inode *inode) |
90163027 | 602 | { |
90163027 TM |
603 | struct nfs_inode *nfsi = NFS_I(inode); |
604 | struct nfs_delegation *delegation; | |
605 | int err = 0; | |
606 | ||
c57d1bc5 | 607 | nfs_wb_all(inode); |
d25be546 TM |
608 | delegation = nfs_start_delegation_return(nfsi); |
609 | if (delegation != NULL) | |
610 | err = nfs_end_delegation_return(inode, delegation, 1); | |
90163027 | 611 | return err; |
1da177e4 LT |
612 | } |
613 | ||
c01d3645 TM |
614 | /** |
615 | * nfs4_inode_make_writeable | |
616 | * @inode: pointer to inode | |
617 | * | |
618 | * Make the inode writeable by returning the delegation if necessary | |
619 | * | |
620 | * Returns zero on success, or a negative errno value. | |
621 | */ | |
622 | int nfs4_inode_make_writeable(struct inode *inode) | |
623 | { | |
624 | if (!nfs4_has_session(NFS_SERVER(inode)->nfs_client) || | |
625 | !nfs4_check_delegation(inode, FMODE_WRITE)) | |
626 | return nfs4_inode_return_delegation(inode); | |
627 | return 0; | |
628 | } | |
629 | ||
b757144f TM |
630 | static void nfs_mark_return_if_closed_delegation(struct nfs_server *server, |
631 | struct nfs_delegation *delegation) | |
632 | { | |
633 | set_bit(NFS_DELEGATION_RETURN_IF_CLOSED, &delegation->flags); | |
634 | set_bit(NFS4CLNT_DELEGRETURN, &server->nfs_client->cl_state); | |
635 | } | |
636 | ||
ed1e6211 TM |
637 | static void nfs_mark_return_delegation(struct nfs_server *server, |
638 | struct nfs_delegation *delegation) | |
6411bd4a TM |
639 | { |
640 | set_bit(NFS_DELEGATION_RETURN, &delegation->flags); | |
ed1e6211 | 641 | set_bit(NFS4CLNT_DELEGRETURN, &server->nfs_client->cl_state); |
6411bd4a TM |
642 | } |
643 | ||
5c31e236 TM |
644 | static bool nfs_server_mark_return_all_delegations(struct nfs_server *server) |
645 | { | |
646 | struct nfs_delegation *delegation; | |
647 | bool ret = false; | |
648 | ||
649 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { | |
650 | nfs_mark_return_delegation(server, delegation); | |
651 | ret = true; | |
652 | } | |
653 | return ret; | |
654 | } | |
655 | ||
b02ba0b6 TM |
656 | static void nfs_client_mark_return_all_delegations(struct nfs_client *clp) |
657 | { | |
658 | struct nfs_server *server; | |
659 | ||
660 | rcu_read_lock(); | |
661 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
662 | nfs_server_mark_return_all_delegations(server); | |
663 | rcu_read_unlock(); | |
664 | } | |
665 | ||
666 | static void nfs_delegation_run_state_manager(struct nfs_client *clp) | |
667 | { | |
668 | if (test_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) | |
669 | nfs4_schedule_state_manager(clp); | |
670 | } | |
671 | ||
672 | /** | |
673 | * nfs_expire_all_delegations | |
674 | * @clp: client to process | |
675 | * | |
676 | */ | |
677 | void nfs_expire_all_delegations(struct nfs_client *clp) | |
678 | { | |
679 | nfs_client_mark_return_all_delegations(clp); | |
680 | nfs_delegation_run_state_manager(clp); | |
681 | } | |
682 | ||
d3978bb3 CL |
683 | /** |
684 | * nfs_super_return_all_delegations - return delegations for one superblock | |
685 | * @sb: sb to process | |
686 | * | |
1da177e4 | 687 | */ |
eeebf916 | 688 | void nfs_server_return_all_delegations(struct nfs_server *server) |
1da177e4 | 689 | { |
d3978bb3 | 690 | struct nfs_client *clp = server->nfs_client; |
5c31e236 | 691 | bool need_wait; |
1da177e4 LT |
692 | |
693 | if (clp == NULL) | |
694 | return; | |
d3978bb3 | 695 | |
8383e460 | 696 | rcu_read_lock(); |
5c31e236 | 697 | need_wait = nfs_server_mark_return_all_delegations(server); |
8383e460 | 698 | rcu_read_unlock(); |
d3978bb3 | 699 | |
5c31e236 | 700 | if (need_wait) { |
d18cc1fd | 701 | nfs4_schedule_state_manager(clp); |
5c31e236 TM |
702 | nfs4_wait_clnt_recover(clp); |
703 | } | |
515d8611 TM |
704 | } |
705 | ||
826e0013 | 706 | static void nfs_mark_return_unused_delegation_types(struct nfs_server *server, |
d3978bb3 | 707 | fmode_t flags) |
515d8611 TM |
708 | { |
709 | struct nfs_delegation *delegation; | |
710 | ||
d3978bb3 | 711 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { |
c79571a5 AB |
712 | if ((delegation->type == (FMODE_READ|FMODE_WRITE)) && !(flags & FMODE_WRITE)) |
713 | continue; | |
714 | if (delegation->type & flags) | |
826e0013 | 715 | nfs_mark_return_if_closed_delegation(server, delegation); |
707fb4b3 | 716 | } |
d3978bb3 CL |
717 | } |
718 | ||
826e0013 | 719 | static void nfs_client_mark_return_unused_delegation_types(struct nfs_client *clp, |
d3978bb3 CL |
720 | fmode_t flags) |
721 | { | |
722 | struct nfs_server *server; | |
723 | ||
724 | rcu_read_lock(); | |
725 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
826e0013 | 726 | nfs_mark_return_unused_delegation_types(server, flags); |
515d8611 | 727 | rcu_read_unlock(); |
1da177e4 LT |
728 | } |
729 | ||
41020b67 TM |
730 | static void nfs_mark_delegation_revoked(struct nfs_server *server, |
731 | struct nfs_delegation *delegation) | |
732 | { | |
733 | set_bit(NFS_DELEGATION_REVOKED, &delegation->flags); | |
059b43e9 | 734 | delegation->stateid.type = NFS4_INVALID_STATEID_TYPE; |
41020b67 TM |
735 | nfs_mark_return_delegation(server, delegation); |
736 | } | |
737 | ||
738 | static bool nfs_revoke_delegation(struct inode *inode, | |
739 | const nfs4_stateid *stateid) | |
869f9dfa TM |
740 | { |
741 | struct nfs_delegation *delegation; | |
7f048831 | 742 | nfs4_stateid tmp; |
41020b67 TM |
743 | bool ret = false; |
744 | ||
869f9dfa TM |
745 | rcu_read_lock(); |
746 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
41020b67 TM |
747 | if (delegation == NULL) |
748 | goto out; | |
7f048831 TM |
749 | if (stateid == NULL) { |
750 | nfs4_stateid_copy(&tmp, &delegation->stateid); | |
751 | stateid = &tmp; | |
752 | } else if (!nfs4_stateid_match(stateid, &delegation->stateid)) | |
41020b67 TM |
753 | goto out; |
754 | nfs_mark_delegation_revoked(NFS_SERVER(inode), delegation); | |
755 | ret = true; | |
756 | out: | |
869f9dfa | 757 | rcu_read_unlock(); |
7f048831 TM |
758 | if (ret) |
759 | nfs_inode_find_state_and_recover(inode, stateid); | |
41020b67 | 760 | return ret; |
869f9dfa TM |
761 | } |
762 | ||
41020b67 TM |
763 | void nfs_remove_bad_delegation(struct inode *inode, |
764 | const nfs4_stateid *stateid) | |
a1d0b5ee TM |
765 | { |
766 | struct nfs_delegation *delegation; | |
767 | ||
41020b67 TM |
768 | if (!nfs_revoke_delegation(inode, stateid)) |
769 | return; | |
d25be546 | 770 | delegation = nfs_inode_detach_delegation(inode); |
7f048831 | 771 | if (delegation) |
a1d0b5ee | 772 | nfs_free_delegation(delegation); |
a1d0b5ee | 773 | } |
9cb81968 | 774 | EXPORT_SYMBOL_GPL(nfs_remove_bad_delegation); |
a1d0b5ee | 775 | |
d3978bb3 | 776 | /** |
826e0013 | 777 | * nfs_expire_unused_delegation_types |
d3978bb3 CL |
778 | * @clp: client to process |
779 | * @flags: delegation types to expire | |
780 | * | |
781 | */ | |
826e0013 | 782 | void nfs_expire_unused_delegation_types(struct nfs_client *clp, fmode_t flags) |
58d9714a | 783 | { |
826e0013 | 784 | nfs_client_mark_return_unused_delegation_types(clp, flags); |
b0d3ded1 | 785 | nfs_delegation_run_state_manager(clp); |
58d9714a TM |
786 | } |
787 | ||
d3978bb3 | 788 | static void nfs_mark_return_unreferenced_delegations(struct nfs_server *server) |
b7391f44 TM |
789 | { |
790 | struct nfs_delegation *delegation; | |
791 | ||
d3978bb3 | 792 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { |
b7391f44 TM |
793 | if (test_and_clear_bit(NFS_DELEGATION_REFERENCED, &delegation->flags)) |
794 | continue; | |
b757144f | 795 | nfs_mark_return_if_closed_delegation(server, delegation); |
b7391f44 | 796 | } |
b7391f44 TM |
797 | } |
798 | ||
d3978bb3 CL |
799 | /** |
800 | * nfs_expire_unreferenced_delegations - Eliminate unused delegations | |
801 | * @clp: nfs_client to process | |
802 | * | |
803 | */ | |
b7391f44 TM |
804 | void nfs_expire_unreferenced_delegations(struct nfs_client *clp) |
805 | { | |
d3978bb3 CL |
806 | struct nfs_server *server; |
807 | ||
808 | rcu_read_lock(); | |
809 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
810 | nfs_mark_return_unreferenced_delegations(server); | |
811 | rcu_read_unlock(); | |
812 | ||
b7391f44 TM |
813 | nfs_delegation_run_state_manager(clp); |
814 | } | |
815 | ||
d3978bb3 CL |
816 | /** |
817 | * nfs_async_inode_return_delegation - asynchronously return a delegation | |
818 | * @inode: inode to process | |
8e663f0e | 819 | * @stateid: state ID information |
d3978bb3 CL |
820 | * |
821 | * Returns zero on success, or a negative errno value. | |
1da177e4 | 822 | */ |
d3978bb3 CL |
823 | int nfs_async_inode_return_delegation(struct inode *inode, |
824 | const nfs4_stateid *stateid) | |
1da177e4 | 825 | { |
ed1e6211 TM |
826 | struct nfs_server *server = NFS_SERVER(inode); |
827 | struct nfs_client *clp = server->nfs_client; | |
6411bd4a | 828 | struct nfs_delegation *delegation; |
1da177e4 | 829 | |
6411bd4a TM |
830 | rcu_read_lock(); |
831 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
755a48a7 TM |
832 | if (delegation == NULL) |
833 | goto out_enoent; | |
4816fdad TM |
834 | if (stateid != NULL && |
835 | !clp->cl_mvops->match_stateid(&delegation->stateid, stateid)) | |
755a48a7 | 836 | goto out_enoent; |
ed1e6211 | 837 | nfs_mark_return_delegation(server, delegation); |
6411bd4a | 838 | rcu_read_unlock(); |
d3978bb3 | 839 | |
6411bd4a TM |
840 | nfs_delegation_run_state_manager(clp); |
841 | return 0; | |
755a48a7 TM |
842 | out_enoent: |
843 | rcu_read_unlock(); | |
844 | return -ENOENT; | |
1da177e4 LT |
845 | } |
846 | ||
d3978bb3 CL |
847 | static struct inode * |
848 | nfs_delegation_find_inode_server(struct nfs_server *server, | |
849 | const struct nfs_fh *fhandle) | |
1da177e4 LT |
850 | { |
851 | struct nfs_delegation *delegation; | |
852 | struct inode *res = NULL; | |
d3978bb3 CL |
853 | |
854 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { | |
86e89489 TM |
855 | spin_lock(&delegation->lock); |
856 | if (delegation->inode != NULL && | |
857 | nfs_compare_fh(fhandle, &NFS_I(delegation->inode)->fh) == 0) { | |
1da177e4 | 858 | res = igrab(delegation->inode); |
6c342655 TM |
859 | spin_unlock(&delegation->lock); |
860 | if (res != NULL) | |
861 | return res; | |
862 | return ERR_PTR(-EAGAIN); | |
1da177e4 | 863 | } |
86e89489 | 864 | spin_unlock(&delegation->lock); |
1da177e4 | 865 | } |
6c342655 | 866 | return ERR_PTR(-ENOENT); |
d3978bb3 CL |
867 | } |
868 | ||
869 | /** | |
870 | * nfs_delegation_find_inode - retrieve the inode associated with a delegation | |
871 | * @clp: client state handle | |
872 | * @fhandle: filehandle from a delegation recall | |
873 | * | |
874 | * Returns pointer to inode matching "fhandle," or NULL if a matching inode | |
875 | * cannot be found. | |
876 | */ | |
877 | struct inode *nfs_delegation_find_inode(struct nfs_client *clp, | |
878 | const struct nfs_fh *fhandle) | |
879 | { | |
880 | struct nfs_server *server; | |
6c342655 | 881 | struct inode *res; |
d3978bb3 CL |
882 | |
883 | rcu_read_lock(); | |
884 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { | |
885 | res = nfs_delegation_find_inode_server(server, fhandle); | |
d5681f59 AS |
886 | if (res != ERR_PTR(-ENOENT)) { |
887 | rcu_read_unlock(); | |
6c342655 | 888 | return res; |
d5681f59 | 889 | } |
d3978bb3 | 890 | } |
8383e460 | 891 | rcu_read_unlock(); |
6c342655 | 892 | return ERR_PTR(-ENOENT); |
1da177e4 LT |
893 | } |
894 | ||
d3978bb3 CL |
895 | static void nfs_delegation_mark_reclaim_server(struct nfs_server *server) |
896 | { | |
897 | struct nfs_delegation *delegation; | |
898 | ||
45870d69 TM |
899 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { |
900 | /* | |
901 | * If the delegation may have been admin revoked, then we | |
902 | * cannot reclaim it. | |
903 | */ | |
904 | if (test_bit(NFS_DELEGATION_TEST_EXPIRED, &delegation->flags)) | |
905 | continue; | |
d3978bb3 | 906 | set_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags); |
45870d69 | 907 | } |
d3978bb3 CL |
908 | } |
909 | ||
910 | /** | |
911 | * nfs_delegation_mark_reclaim - mark all delegations as needing to be reclaimed | |
912 | * @clp: nfs_client to process | |
913 | * | |
1da177e4 | 914 | */ |
adfa6f98 | 915 | void nfs_delegation_mark_reclaim(struct nfs_client *clp) |
1da177e4 | 916 | { |
d3978bb3 CL |
917 | struct nfs_server *server; |
918 | ||
8383e460 | 919 | rcu_read_lock(); |
d3978bb3 CL |
920 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) |
921 | nfs_delegation_mark_reclaim_server(server); | |
8383e460 | 922 | rcu_read_unlock(); |
1da177e4 LT |
923 | } |
924 | ||
d3978bb3 CL |
925 | /** |
926 | * nfs_delegation_reap_unclaimed - reap unclaimed delegations after reboot recovery is done | |
927 | * @clp: nfs_client to process | |
928 | * | |
1da177e4 | 929 | */ |
adfa6f98 | 930 | void nfs_delegation_reap_unclaimed(struct nfs_client *clp) |
1da177e4 | 931 | { |
8383e460 | 932 | struct nfs_delegation *delegation; |
d3978bb3 | 933 | struct nfs_server *server; |
86e89489 | 934 | struct inode *inode; |
d3978bb3 | 935 | |
8383e460 TM |
936 | restart: |
937 | rcu_read_lock(); | |
d3978bb3 CL |
938 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { |
939 | list_for_each_entry_rcu(delegation, &server->delegations, | |
940 | super_list) { | |
ec3ca4e5 TM |
941 | if (test_bit(NFS_DELEGATION_RETURNING, |
942 | &delegation->flags)) | |
943 | continue; | |
d3978bb3 CL |
944 | if (test_bit(NFS_DELEGATION_NEED_RECLAIM, |
945 | &delegation->flags) == 0) | |
946 | continue; | |
9f0f8e12 | 947 | if (!nfs_sb_active(server->super)) |
f3893491 | 948 | break; /* continue in outer loop */ |
9f0f8e12 TM |
949 | inode = nfs_delegation_grab_inode(delegation); |
950 | if (inode == NULL) { | |
951 | rcu_read_unlock(); | |
952 | nfs_sb_deactive(server->super); | |
953 | goto restart; | |
954 | } | |
b04b22f4 | 955 | delegation = nfs_start_delegation_return_locked(NFS_I(inode)); |
d3978bb3 | 956 | rcu_read_unlock(); |
b04b22f4 TM |
957 | if (delegation != NULL) { |
958 | delegation = nfs_detach_delegation(NFS_I(inode), | |
959 | delegation, server); | |
960 | if (delegation != NULL) | |
961 | nfs_free_delegation(delegation); | |
962 | } | |
d3978bb3 | 963 | iput(inode); |
9f0f8e12 | 964 | nfs_sb_deactive(server->super); |
3ca951b6 | 965 | cond_resched(); |
d3978bb3 CL |
966 | goto restart; |
967 | } | |
1da177e4 | 968 | } |
8383e460 | 969 | rcu_read_unlock(); |
1da177e4 | 970 | } |
3e4f6290 | 971 | |
bb3d1a3b TM |
972 | static inline bool nfs4_server_rebooted(const struct nfs_client *clp) |
973 | { | |
974 | return (clp->cl_state & (BIT(NFS4CLNT_CHECK_LEASE) | | |
975 | BIT(NFS4CLNT_LEASE_EXPIRED) | | |
976 | BIT(NFS4CLNT_SESSION_RESET))) != 0; | |
977 | } | |
978 | ||
45870d69 TM |
979 | static void nfs_mark_test_expired_delegation(struct nfs_server *server, |
980 | struct nfs_delegation *delegation) | |
981 | { | |
059b43e9 TM |
982 | if (delegation->stateid.type == NFS4_INVALID_STATEID_TYPE) |
983 | return; | |
45870d69 TM |
984 | clear_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags); |
985 | set_bit(NFS_DELEGATION_TEST_EXPIRED, &delegation->flags); | |
986 | set_bit(NFS4CLNT_DELEGATION_EXPIRED, &server->nfs_client->cl_state); | |
987 | } | |
988 | ||
bb3d1a3b TM |
989 | static void nfs_inode_mark_test_expired_delegation(struct nfs_server *server, |
990 | struct inode *inode) | |
991 | { | |
992 | struct nfs_delegation *delegation; | |
993 | ||
994 | rcu_read_lock(); | |
995 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
996 | if (delegation) | |
997 | nfs_mark_test_expired_delegation(server, delegation); | |
998 | rcu_read_unlock(); | |
999 | ||
1000 | } | |
1001 | ||
45870d69 TM |
1002 | static void nfs_delegation_mark_test_expired_server(struct nfs_server *server) |
1003 | { | |
1004 | struct nfs_delegation *delegation; | |
1005 | ||
1006 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) | |
1007 | nfs_mark_test_expired_delegation(server, delegation); | |
1008 | } | |
1009 | ||
1010 | /** | |
1011 | * nfs_mark_test_expired_all_delegations - mark all delegations for testing | |
1012 | * @clp: nfs_client to process | |
1013 | * | |
1014 | * Iterates through all the delegations associated with this server and | |
1015 | * marks them as needing to be checked for validity. | |
1016 | */ | |
1017 | void nfs_mark_test_expired_all_delegations(struct nfs_client *clp) | |
1018 | { | |
1019 | struct nfs_server *server; | |
1020 | ||
1021 | rcu_read_lock(); | |
1022 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
1023 | nfs_delegation_mark_test_expired_server(server); | |
1024 | rcu_read_unlock(); | |
1025 | } | |
1026 | ||
1027 | /** | |
1028 | * nfs_reap_expired_delegations - reap expired delegations | |
1029 | * @clp: nfs_client to process | |
1030 | * | |
1031 | * Iterates through all the delegations associated with this server and | |
1032 | * checks if they have may have been revoked. This function is usually | |
1033 | * expected to be called in cases where the server may have lost its | |
1034 | * lease. | |
1035 | */ | |
1036 | void nfs_reap_expired_delegations(struct nfs_client *clp) | |
1037 | { | |
1038 | const struct nfs4_minor_version_ops *ops = clp->cl_mvops; | |
1039 | struct nfs_delegation *delegation; | |
1040 | struct nfs_server *server; | |
1041 | struct inode *inode; | |
1042 | struct rpc_cred *cred; | |
1043 | nfs4_stateid stateid; | |
1044 | ||
1045 | restart: | |
1046 | rcu_read_lock(); | |
1047 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { | |
1048 | list_for_each_entry_rcu(delegation, &server->delegations, | |
1049 | super_list) { | |
1050 | if (test_bit(NFS_DELEGATION_RETURNING, | |
1051 | &delegation->flags)) | |
1052 | continue; | |
1053 | if (test_bit(NFS_DELEGATION_TEST_EXPIRED, | |
1054 | &delegation->flags) == 0) | |
1055 | continue; | |
1056 | if (!nfs_sb_active(server->super)) | |
f3893491 | 1057 | break; /* continue in outer loop */ |
45870d69 TM |
1058 | inode = nfs_delegation_grab_inode(delegation); |
1059 | if (inode == NULL) { | |
1060 | rcu_read_unlock(); | |
1061 | nfs_sb_deactive(server->super); | |
1062 | goto restart; | |
1063 | } | |
1064 | cred = get_rpccred_rcu(delegation->cred); | |
1065 | nfs4_stateid_copy(&stateid, &delegation->stateid); | |
1066 | clear_bit(NFS_DELEGATION_TEST_EXPIRED, &delegation->flags); | |
1067 | rcu_read_unlock(); | |
1068 | if (cred != NULL && | |
1069 | ops->test_and_free_expired(server, &stateid, cred) < 0) { | |
1070 | nfs_revoke_delegation(inode, &stateid); | |
1071 | nfs_inode_find_state_and_recover(inode, &stateid); | |
1072 | } | |
1073 | put_rpccred(cred); | |
bb3d1a3b TM |
1074 | if (nfs4_server_rebooted(clp)) { |
1075 | nfs_inode_mark_test_expired_delegation(server,inode); | |
1076 | iput(inode); | |
1077 | nfs_sb_deactive(server->super); | |
1078 | return; | |
1079 | } | |
45870d69 TM |
1080 | iput(inode); |
1081 | nfs_sb_deactive(server->super); | |
3ca951b6 | 1082 | cond_resched(); |
45870d69 TM |
1083 | goto restart; |
1084 | } | |
1085 | } | |
1086 | rcu_read_unlock(); | |
1087 | } | |
1088 | ||
6c2d8f8d TM |
1089 | void nfs_inode_find_delegation_state_and_recover(struct inode *inode, |
1090 | const nfs4_stateid *stateid) | |
1091 | { | |
1092 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; | |
1093 | struct nfs_delegation *delegation; | |
1094 | bool found = false; | |
1095 | ||
1096 | rcu_read_lock(); | |
1097 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
1098 | if (delegation && | |
1099 | nfs4_stateid_match_other(&delegation->stateid, stateid)) { | |
1100 | nfs_mark_test_expired_delegation(NFS_SERVER(inode), delegation); | |
1101 | found = true; | |
1102 | } | |
1103 | rcu_read_unlock(); | |
1104 | if (found) | |
1105 | nfs4_schedule_state_manager(clp); | |
1106 | } | |
1107 | ||
d3978bb3 CL |
1108 | /** |
1109 | * nfs_delegations_present - check for existence of delegations | |
1110 | * @clp: client state handle | |
1111 | * | |
1112 | * Returns one if there are any nfs_delegation structures attached | |
1113 | * to this nfs_client. | |
1114 | */ | |
1115 | int nfs_delegations_present(struct nfs_client *clp) | |
1116 | { | |
1117 | struct nfs_server *server; | |
1118 | int ret = 0; | |
1119 | ||
1120 | rcu_read_lock(); | |
1121 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
1122 | if (!list_empty(&server->delegations)) { | |
1123 | ret = 1; | |
1124 | break; | |
1125 | } | |
1126 | rcu_read_unlock(); | |
1127 | return ret; | |
1128 | } | |
1129 | ||
12f275cd TM |
1130 | /** |
1131 | * nfs4_refresh_delegation_stateid - Update delegation stateid seqid | |
1132 | * @dst: stateid to refresh | |
1133 | * @inode: inode to check | |
1134 | * | |
1135 | * Returns "true" and updates "dst->seqid" * if inode had a delegation | |
1136 | * that matches our delegation stateid. Otherwise "false" is returned. | |
1137 | */ | |
1138 | bool nfs4_refresh_delegation_stateid(nfs4_stateid *dst, struct inode *inode) | |
1139 | { | |
1140 | struct nfs_delegation *delegation; | |
1141 | bool ret = false; | |
1142 | if (!inode) | |
1143 | goto out; | |
1144 | ||
1145 | rcu_read_lock(); | |
1146 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
1147 | if (delegation != NULL && | |
1148 | nfs4_stateid_match_other(dst, &delegation->stateid)) { | |
1149 | dst->seqid = delegation->stateid.seqid; | |
1150 | return ret; | |
1151 | } | |
1152 | rcu_read_unlock(); | |
1153 | out: | |
1154 | return ret; | |
1155 | } | |
1156 | ||
d3978bb3 CL |
1157 | /** |
1158 | * nfs4_copy_delegation_stateid - Copy inode's state ID information | |
d3978bb3 | 1159 | * @inode: inode to check |
0032a7a7 | 1160 | * @flags: delegation type requirement |
abf4e13c TM |
1161 | * @dst: stateid data structure to fill in |
1162 | * @cred: optional argument to retrieve credential | |
d3978bb3 | 1163 | * |
0032a7a7 TM |
1164 | * Returns "true" and fills in "dst->data" * if inode had a delegation, |
1165 | * otherwise "false" is returned. | |
d3978bb3 | 1166 | */ |
abf4e13c TM |
1167 | bool nfs4_copy_delegation_stateid(struct inode *inode, fmode_t flags, |
1168 | nfs4_stateid *dst, struct rpc_cred **cred) | |
3e4f6290 | 1169 | { |
3e4f6290 TM |
1170 | struct nfs_inode *nfsi = NFS_I(inode); |
1171 | struct nfs_delegation *delegation; | |
0032a7a7 | 1172 | bool ret; |
3e4f6290 | 1173 | |
0032a7a7 | 1174 | flags &= FMODE_READ|FMODE_WRITE; |
8383e460 TM |
1175 | rcu_read_lock(); |
1176 | delegation = rcu_dereference(nfsi->delegation); | |
aa05c87f | 1177 | ret = nfs4_is_valid_delegation(delegation, flags); |
0032a7a7 | 1178 | if (ret) { |
f597c537 | 1179 | nfs4_stateid_copy(dst, &delegation->stateid); |
0032a7a7 | 1180 | nfs_mark_delegation_referenced(delegation); |
abf4e13c TM |
1181 | if (cred) |
1182 | *cred = get_rpccred(delegation->cred); | |
3e4f6290 | 1183 | } |
8383e460 TM |
1184 | rcu_read_unlock(); |
1185 | return ret; | |
3e4f6290 | 1186 | } |
5445b1fb TM |
1187 | |
1188 | /** | |
1189 | * nfs4_delegation_flush_on_close - Check if we must flush file on close | |
1190 | * @inode: inode to check | |
1191 | * | |
1192 | * This function checks the number of outstanding writes to the file | |
1193 | * against the delegation 'space_limit' field to see if | |
1194 | * the spec requires us to flush the file on close. | |
1195 | */ | |
1196 | bool nfs4_delegation_flush_on_close(const struct inode *inode) | |
1197 | { | |
1198 | struct nfs_inode *nfsi = NFS_I(inode); | |
1199 | struct nfs_delegation *delegation; | |
1200 | bool ret = true; | |
1201 | ||
1202 | rcu_read_lock(); | |
1203 | delegation = rcu_dereference(nfsi->delegation); | |
1204 | if (delegation == NULL || !(delegation->type & FMODE_WRITE)) | |
1205 | goto out; | |
a6b6d5b8 | 1206 | if (atomic_long_read(&nfsi->nrequests) < delegation->pagemod_limit) |
5445b1fb TM |
1207 | ret = false; |
1208 | out: | |
1209 | rcu_read_unlock(); | |
1210 | return ret; | |
1211 | } |