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