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> | |
405f5571 | 13 | #include <linux/smp_lock.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" |
1da177e4 | 23 | |
905f8d16 | 24 | static void nfs_do_free_delegation(struct nfs_delegation *delegation) |
1da177e4 | 25 | { |
1da177e4 LT |
26 | kfree(delegation); |
27 | } | |
28 | ||
8383e460 TM |
29 | static void nfs_free_delegation_callback(struct rcu_head *head) |
30 | { | |
31 | struct nfs_delegation *delegation = container_of(head, struct nfs_delegation, rcu); | |
32 | ||
905f8d16 TM |
33 | nfs_do_free_delegation(delegation); |
34 | } | |
35 | ||
36 | static void nfs_free_delegation(struct nfs_delegation *delegation) | |
37 | { | |
38 | struct rpc_cred *cred; | |
39 | ||
40 | cred = rcu_dereference(delegation->cred); | |
41 | rcu_assign_pointer(delegation->cred, NULL); | |
42 | call_rcu(&delegation->rcu, nfs_free_delegation_callback); | |
43 | if (cred) | |
44 | put_rpccred(cred); | |
8383e460 TM |
45 | } |
46 | ||
b7391f44 TM |
47 | void nfs_mark_delegation_referenced(struct nfs_delegation *delegation) |
48 | { | |
49 | set_bit(NFS_DELEGATION_REFERENCED, &delegation->flags); | |
50 | } | |
51 | ||
bd7bf9d5 | 52 | int nfs_have_delegation(struct inode *inode, fmode_t flags) |
b7391f44 TM |
53 | { |
54 | struct nfs_delegation *delegation; | |
55 | int ret = 0; | |
56 | ||
57 | flags &= FMODE_READ|FMODE_WRITE; | |
58 | rcu_read_lock(); | |
59 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
60 | if (delegation != NULL && (delegation->type & flags) == flags) { | |
61 | nfs_mark_delegation_referenced(delegation); | |
62 | ret = 1; | |
63 | } | |
64 | rcu_read_unlock(); | |
65 | return ret; | |
66 | } | |
67 | ||
888e694c TM |
68 | static int nfs_delegation_claim_locks(struct nfs_open_context *ctx, struct nfs4_state *state) |
69 | { | |
70 | struct inode *inode = state->inode; | |
71 | struct file_lock *fl; | |
d5122201 | 72 | int status = 0; |
888e694c | 73 | |
3f09df70 TM |
74 | if (inode->i_flock == NULL) |
75 | goto out; | |
76 | ||
77 | /* Protect inode->i_flock using the BKL */ | |
78 | lock_kernel(); | |
90dc7d27 | 79 | for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) { |
888e694c TM |
80 | if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK))) |
81 | continue; | |
cd3758e3 | 82 | if (nfs_file_open_context(fl->fl_file) != ctx) |
888e694c | 83 | continue; |
3f09df70 | 84 | unlock_kernel(); |
888e694c | 85 | status = nfs4_lock_delegation_recall(state, fl); |
d5122201 | 86 | if (status < 0) |
3f09df70 TM |
87 | goto out; |
88 | lock_kernel(); | |
888e694c | 89 | } |
3f09df70 TM |
90 | unlock_kernel(); |
91 | out: | |
888e694c TM |
92 | return status; |
93 | } | |
94 | ||
d18cc1fd | 95 | static int nfs_delegation_claim_opens(struct inode *inode, const nfs4_stateid *stateid) |
1da177e4 LT |
96 | { |
97 | struct nfs_inode *nfsi = NFS_I(inode); | |
98 | struct nfs_open_context *ctx; | |
99 | struct nfs4_state *state; | |
888e694c | 100 | int err; |
1da177e4 LT |
101 | |
102 | again: | |
103 | spin_lock(&inode->i_lock); | |
104 | list_for_each_entry(ctx, &nfsi->open_files, list) { | |
105 | state = ctx->state; | |
106 | if (state == NULL) | |
107 | continue; | |
108 | if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) | |
109 | continue; | |
90163027 TM |
110 | if (memcmp(state->stateid.data, stateid->data, sizeof(state->stateid.data)) != 0) |
111 | continue; | |
1da177e4 LT |
112 | get_nfs_open_context(ctx); |
113 | spin_unlock(&inode->i_lock); | |
13437e12 | 114 | err = nfs4_open_delegation_recall(ctx, state, stateid); |
888e694c TM |
115 | if (err >= 0) |
116 | err = nfs_delegation_claim_locks(ctx, state); | |
1da177e4 | 117 | put_nfs_open_context(ctx); |
888e694c | 118 | if (err != 0) |
d18cc1fd | 119 | return err; |
1da177e4 LT |
120 | goto again; |
121 | } | |
122 | spin_unlock(&inode->i_lock); | |
d18cc1fd | 123 | return 0; |
1da177e4 LT |
124 | } |
125 | ||
126 | /* | |
127 | * Set up a delegation on an inode | |
128 | */ | |
129 | void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res) | |
130 | { | |
131 | struct nfs_delegation *delegation = NFS_I(inode)->delegation; | |
05c88bab | 132 | struct rpc_cred *oldcred; |
1da177e4 LT |
133 | |
134 | if (delegation == NULL) | |
135 | return; | |
136 | memcpy(delegation->stateid.data, res->delegation.data, | |
137 | sizeof(delegation->stateid.data)); | |
138 | delegation->type = res->delegation_type; | |
139 | delegation->maxsize = res->maxsize; | |
05c88bab | 140 | oldcred = delegation->cred; |
1da177e4 | 141 | delegation->cred = get_rpccred(cred); |
15c831bf | 142 | clear_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags); |
1da177e4 LT |
143 | NFS_I(inode)->delegation_state = delegation->type; |
144 | smp_wmb(); | |
05c88bab | 145 | put_rpccred(oldcred); |
1da177e4 LT |
146 | } |
147 | ||
57bfa891 TM |
148 | static int nfs_do_return_delegation(struct inode *inode, struct nfs_delegation *delegation, int issync) |
149 | { | |
150 | int res = 0; | |
151 | ||
152 | res = nfs4_proc_delegreturn(inode, delegation->cred, &delegation->stateid, issync); | |
153 | nfs_free_delegation(delegation); | |
154 | return res; | |
155 | } | |
156 | ||
86e89489 TM |
157 | static struct inode *nfs_delegation_grab_inode(struct nfs_delegation *delegation) |
158 | { | |
159 | struct inode *inode = NULL; | |
160 | ||
161 | spin_lock(&delegation->lock); | |
162 | if (delegation->inode != NULL) | |
163 | inode = igrab(delegation->inode); | |
164 | spin_unlock(&delegation->lock); | |
165 | return inode; | |
166 | } | |
167 | ||
57bfa891 TM |
168 | static struct nfs_delegation *nfs_detach_delegation_locked(struct nfs_inode *nfsi, const nfs4_stateid *stateid) |
169 | { | |
170 | struct nfs_delegation *delegation = rcu_dereference(nfsi->delegation); | |
171 | ||
172 | if (delegation == NULL) | |
173 | goto nomatch; | |
34310430 | 174 | spin_lock(&delegation->lock); |
57bfa891 TM |
175 | if (stateid != NULL && memcmp(delegation->stateid.data, stateid->data, |
176 | sizeof(delegation->stateid.data)) != 0) | |
34310430 | 177 | goto nomatch_unlock; |
57bfa891 | 178 | list_del_rcu(&delegation->super_list); |
86e89489 | 179 | delegation->inode = NULL; |
57bfa891 TM |
180 | nfsi->delegation_state = 0; |
181 | rcu_assign_pointer(nfsi->delegation, NULL); | |
34310430 | 182 | spin_unlock(&delegation->lock); |
57bfa891 | 183 | return delegation; |
34310430 TM |
184 | nomatch_unlock: |
185 | spin_unlock(&delegation->lock); | |
57bfa891 TM |
186 | nomatch: |
187 | return NULL; | |
188 | } | |
189 | ||
1da177e4 LT |
190 | /* |
191 | * Set up a delegation on an inode | |
192 | */ | |
193 | int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res) | |
194 | { | |
7539bbab | 195 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; |
1da177e4 LT |
196 | struct nfs_inode *nfsi = NFS_I(inode); |
197 | struct nfs_delegation *delegation; | |
57bfa891 | 198 | struct nfs_delegation *freeme = NULL; |
1da177e4 LT |
199 | int status = 0; |
200 | ||
f52720ca | 201 | delegation = kmalloc(sizeof(*delegation), GFP_KERNEL); |
1da177e4 LT |
202 | if (delegation == NULL) |
203 | return -ENOMEM; | |
204 | memcpy(delegation->stateid.data, res->delegation.data, | |
205 | sizeof(delegation->stateid.data)); | |
206 | delegation->type = res->delegation_type; | |
207 | delegation->maxsize = res->maxsize; | |
beb2a5ec | 208 | delegation->change_attr = nfsi->change_attr; |
1da177e4 LT |
209 | delegation->cred = get_rpccred(cred); |
210 | delegation->inode = inode; | |
b7391f44 | 211 | delegation->flags = 1<<NFS_DELEGATION_REFERENCED; |
34310430 | 212 | spin_lock_init(&delegation->lock); |
1da177e4 LT |
213 | |
214 | spin_lock(&clp->cl_lock); | |
57bfa891 | 215 | if (rcu_dereference(nfsi->delegation) != NULL) { |
1da177e4 | 216 | if (memcmp(&delegation->stateid, &nfsi->delegation->stateid, |
57bfa891 TM |
217 | sizeof(delegation->stateid)) == 0 && |
218 | delegation->type == nfsi->delegation->type) { | |
219 | goto out; | |
1da177e4 | 220 | } |
57bfa891 TM |
221 | /* |
222 | * Deal with broken servers that hand out two | |
223 | * delegations for the same file. | |
224 | */ | |
225 | dfprintk(FILE, "%s: server %s handed out " | |
226 | "a duplicate delegation!\n", | |
3110ff80 | 227 | __func__, clp->cl_hostname); |
57bfa891 TM |
228 | if (delegation->type <= nfsi->delegation->type) { |
229 | freeme = delegation; | |
230 | delegation = NULL; | |
231 | goto out; | |
232 | } | |
233 | freeme = nfs_detach_delegation_locked(nfsi, NULL); | |
1da177e4 | 234 | } |
57bfa891 TM |
235 | list_add_rcu(&delegation->super_list, &clp->cl_delegations); |
236 | nfsi->delegation_state = delegation->type; | |
237 | rcu_assign_pointer(nfsi->delegation, delegation); | |
238 | delegation = NULL; | |
412c77ce TM |
239 | |
240 | /* Ensure we revalidate the attributes and page cache! */ | |
241 | spin_lock(&inode->i_lock); | |
242 | nfsi->cache_validity |= NFS_INO_REVAL_FORCED; | |
243 | spin_unlock(&inode->i_lock); | |
244 | ||
57bfa891 | 245 | out: |
1da177e4 | 246 | spin_unlock(&clp->cl_lock); |
603c83da TM |
247 | if (delegation != NULL) |
248 | nfs_free_delegation(delegation); | |
57bfa891 TM |
249 | if (freeme != NULL) |
250 | nfs_do_return_delegation(inode, freeme, 0); | |
1da177e4 LT |
251 | return status; |
252 | } | |
253 | ||
1da177e4 LT |
254 | /* Sync all data to disk upon delegation return */ |
255 | static void nfs_msync_inode(struct inode *inode) | |
256 | { | |
257 | filemap_fdatawrite(inode->i_mapping); | |
258 | nfs_wb_all(inode); | |
259 | filemap_fdatawait(inode->i_mapping); | |
260 | } | |
261 | ||
262 | /* | |
263 | * Basic procedure for returning a delegation to the server | |
264 | */ | |
d18cc1fd | 265 | static int __nfs_inode_return_delegation(struct inode *inode, struct nfs_delegation *delegation, int issync) |
1da177e4 | 266 | { |
1da177e4 | 267 | struct nfs_inode *nfsi = NFS_I(inode); |
d18cc1fd | 268 | int err; |
1da177e4 | 269 | |
3f09df70 TM |
270 | /* |
271 | * Guard against new delegated open/lock/unlock calls and against | |
272 | * state recovery | |
273 | */ | |
1da177e4 | 274 | down_write(&nfsi->rwsem); |
d18cc1fd | 275 | err = nfs_delegation_claim_opens(inode, &delegation->stateid); |
1da177e4 | 276 | up_write(&nfsi->rwsem); |
d18cc1fd TM |
277 | if (err) |
278 | goto out; | |
1da177e4 | 279 | |
d18cc1fd TM |
280 | err = nfs_do_return_delegation(inode, delegation, issync); |
281 | out: | |
282 | return err; | |
90163027 TM |
283 | } |
284 | ||
515d8611 TM |
285 | /* |
286 | * Return all delegations that have been marked for return | |
287 | */ | |
d18cc1fd | 288 | int nfs_client_return_marked_delegations(struct nfs_client *clp) |
515d8611 TM |
289 | { |
290 | struct nfs_delegation *delegation; | |
291 | struct inode *inode; | |
d18cc1fd | 292 | int err = 0; |
515d8611 TM |
293 | |
294 | restart: | |
295 | rcu_read_lock(); | |
296 | list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) { | |
297 | if (!test_and_clear_bit(NFS_DELEGATION_RETURN, &delegation->flags)) | |
298 | continue; | |
299 | inode = nfs_delegation_grab_inode(delegation); | |
300 | if (inode == NULL) | |
301 | continue; | |
302 | spin_lock(&clp->cl_lock); | |
303 | delegation = nfs_detach_delegation_locked(NFS_I(inode), NULL); | |
304 | spin_unlock(&clp->cl_lock); | |
305 | rcu_read_unlock(); | |
d18cc1fd TM |
306 | if (delegation != NULL) { |
307 | filemap_flush(inode->i_mapping); | |
308 | err = __nfs_inode_return_delegation(inode, delegation, 0); | |
309 | } | |
515d8611 | 310 | iput(inode); |
d18cc1fd TM |
311 | if (!err) |
312 | goto restart; | |
313 | set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state); | |
314 | return err; | |
515d8611 TM |
315 | } |
316 | rcu_read_unlock(); | |
d18cc1fd | 317 | return 0; |
515d8611 TM |
318 | } |
319 | ||
e6f81075 TM |
320 | /* |
321 | * This function returns the delegation without reclaiming opens | |
322 | * or protecting against delegation reclaims. | |
323 | * It is therefore really only safe to be called from | |
324 | * nfs4_clear_inode() | |
325 | */ | |
326 | void nfs_inode_return_delegation_noreclaim(struct inode *inode) | |
327 | { | |
328 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; | |
329 | struct nfs_inode *nfsi = NFS_I(inode); | |
330 | struct nfs_delegation *delegation; | |
331 | ||
332 | if (rcu_dereference(nfsi->delegation) != NULL) { | |
333 | spin_lock(&clp->cl_lock); | |
334 | delegation = nfs_detach_delegation_locked(nfsi, NULL); | |
335 | spin_unlock(&clp->cl_lock); | |
336 | if (delegation != NULL) | |
337 | nfs_do_return_delegation(inode, delegation, 0); | |
338 | } | |
339 | } | |
340 | ||
90163027 TM |
341 | int nfs_inode_return_delegation(struct inode *inode) |
342 | { | |
343 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; | |
344 | struct nfs_inode *nfsi = NFS_I(inode); | |
345 | struct nfs_delegation *delegation; | |
346 | int err = 0; | |
347 | ||
8383e460 | 348 | if (rcu_dereference(nfsi->delegation) != NULL) { |
90163027 TM |
349 | spin_lock(&clp->cl_lock); |
350 | delegation = nfs_detach_delegation_locked(nfsi, NULL); | |
351 | spin_unlock(&clp->cl_lock); | |
d18cc1fd TM |
352 | if (delegation != NULL) { |
353 | nfs_msync_inode(inode); | |
354 | err = __nfs_inode_return_delegation(inode, delegation, 1); | |
355 | } | |
90163027 TM |
356 | } |
357 | return err; | |
1da177e4 LT |
358 | } |
359 | ||
6411bd4a TM |
360 | static void nfs_mark_return_delegation(struct nfs_client *clp, struct nfs_delegation *delegation) |
361 | { | |
362 | set_bit(NFS_DELEGATION_RETURN, &delegation->flags); | |
363 | set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state); | |
364 | } | |
365 | ||
1da177e4 LT |
366 | /* |
367 | * Return all delegations associated to a super block | |
368 | */ | |
515d8611 | 369 | void nfs_super_return_all_delegations(struct super_block *sb) |
1da177e4 | 370 | { |
7539bbab | 371 | struct nfs_client *clp = NFS_SB(sb)->nfs_client; |
1da177e4 | 372 | struct nfs_delegation *delegation; |
1da177e4 LT |
373 | |
374 | if (clp == NULL) | |
375 | return; | |
8383e460 TM |
376 | rcu_read_lock(); |
377 | list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) { | |
86e89489 TM |
378 | spin_lock(&delegation->lock); |
379 | if (delegation->inode != NULL && delegation->inode->i_sb == sb) | |
515d8611 | 380 | set_bit(NFS_DELEGATION_RETURN, &delegation->flags); |
86e89489 | 381 | spin_unlock(&delegation->lock); |
1da177e4 | 382 | } |
8383e460 | 383 | rcu_read_unlock(); |
d18cc1fd TM |
384 | if (nfs_client_return_marked_delegations(clp) != 0) |
385 | nfs4_schedule_state_manager(clp); | |
515d8611 TM |
386 | } |
387 | ||
c79571a5 AB |
388 | static |
389 | void nfs_client_mark_return_all_delegation_types(struct nfs_client *clp, fmode_t flags) | |
515d8611 TM |
390 | { |
391 | struct nfs_delegation *delegation; | |
392 | ||
393 | rcu_read_lock(); | |
707fb4b3 | 394 | list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) { |
c79571a5 AB |
395 | if ((delegation->type == (FMODE_READ|FMODE_WRITE)) && !(flags & FMODE_WRITE)) |
396 | continue; | |
397 | if (delegation->type & flags) | |
398 | nfs_mark_return_delegation(clp, delegation); | |
707fb4b3 | 399 | } |
515d8611 | 400 | rcu_read_unlock(); |
1da177e4 LT |
401 | } |
402 | ||
c79571a5 AB |
403 | static void nfs_client_mark_return_all_delegations(struct nfs_client *clp) |
404 | { | |
405 | nfs_client_mark_return_all_delegation_types(clp, FMODE_READ|FMODE_WRITE); | |
406 | } | |
407 | ||
b0d3ded1 | 408 | static void nfs_delegation_run_state_manager(struct nfs_client *clp) |
58d9714a | 409 | { |
b0d3ded1 TM |
410 | if (test_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) |
411 | nfs4_schedule_state_manager(clp); | |
58d9714a TM |
412 | } |
413 | ||
31f09607 | 414 | void nfs_expire_all_delegation_types(struct nfs_client *clp, fmode_t flags) |
58d9714a | 415 | { |
c79571a5 | 416 | nfs_client_mark_return_all_delegation_types(clp, flags); |
b0d3ded1 | 417 | nfs_delegation_run_state_manager(clp); |
58d9714a TM |
418 | } |
419 | ||
c79571a5 AB |
420 | void nfs_expire_all_delegations(struct nfs_client *clp) |
421 | { | |
422 | nfs_expire_all_delegation_types(clp, FMODE_READ|FMODE_WRITE); | |
423 | } | |
424 | ||
1da177e4 LT |
425 | /* |
426 | * Return all delegations following an NFS4ERR_CB_PATH_DOWN error. | |
427 | */ | |
adfa6f98 | 428 | void nfs_handle_cb_pathdown(struct nfs_client *clp) |
1da177e4 | 429 | { |
1da177e4 LT |
430 | if (clp == NULL) |
431 | return; | |
707fb4b3 | 432 | nfs_client_mark_return_all_delegations(clp); |
1da177e4 LT |
433 | } |
434 | ||
b7391f44 TM |
435 | static void nfs_client_mark_return_unreferenced_delegations(struct nfs_client *clp) |
436 | { | |
437 | struct nfs_delegation *delegation; | |
438 | ||
439 | rcu_read_lock(); | |
440 | list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) { | |
441 | if (test_and_clear_bit(NFS_DELEGATION_REFERENCED, &delegation->flags)) | |
442 | continue; | |
b4a6f496 | 443 | nfs_mark_return_delegation(clp, delegation); |
b7391f44 TM |
444 | } |
445 | rcu_read_unlock(); | |
446 | } | |
447 | ||
448 | void nfs_expire_unreferenced_delegations(struct nfs_client *clp) | |
449 | { | |
450 | nfs_client_mark_return_unreferenced_delegations(clp); | |
451 | nfs_delegation_run_state_manager(clp); | |
452 | } | |
453 | ||
1da177e4 LT |
454 | /* |
455 | * Asynchronous delegation recall! | |
456 | */ | |
2597641d AB |
457 | int nfs_async_inode_return_delegation(struct inode *inode, const nfs4_stateid *stateid, |
458 | int (*validate_stateid)(struct nfs_delegation *delegation, | |
459 | const nfs4_stateid *stateid)) | |
1da177e4 | 460 | { |
6411bd4a TM |
461 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; |
462 | struct nfs_delegation *delegation; | |
1da177e4 | 463 | |
6411bd4a TM |
464 | rcu_read_lock(); |
465 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
2597641d AB |
466 | |
467 | if (!validate_stateid(delegation, stateid)) { | |
6411bd4a TM |
468 | rcu_read_unlock(); |
469 | return -ENOENT; | |
470 | } | |
2597641d | 471 | |
6411bd4a TM |
472 | nfs_mark_return_delegation(clp, delegation); |
473 | rcu_read_unlock(); | |
474 | nfs_delegation_run_state_manager(clp); | |
475 | return 0; | |
1da177e4 LT |
476 | } |
477 | ||
478 | /* | |
479 | * Retrieve the inode associated with a delegation | |
480 | */ | |
adfa6f98 | 481 | struct inode *nfs_delegation_find_inode(struct nfs_client *clp, const struct nfs_fh *fhandle) |
1da177e4 LT |
482 | { |
483 | struct nfs_delegation *delegation; | |
484 | struct inode *res = NULL; | |
8383e460 TM |
485 | rcu_read_lock(); |
486 | list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) { | |
86e89489 TM |
487 | spin_lock(&delegation->lock); |
488 | if (delegation->inode != NULL && | |
489 | nfs_compare_fh(fhandle, &NFS_I(delegation->inode)->fh) == 0) { | |
1da177e4 | 490 | res = igrab(delegation->inode); |
1da177e4 | 491 | } |
86e89489 TM |
492 | spin_unlock(&delegation->lock); |
493 | if (res != NULL) | |
494 | break; | |
1da177e4 | 495 | } |
8383e460 | 496 | rcu_read_unlock(); |
1da177e4 LT |
497 | return res; |
498 | } | |
499 | ||
500 | /* | |
501 | * Mark all delegations as needing to be reclaimed | |
502 | */ | |
adfa6f98 | 503 | void nfs_delegation_mark_reclaim(struct nfs_client *clp) |
1da177e4 LT |
504 | { |
505 | struct nfs_delegation *delegation; | |
8383e460 TM |
506 | rcu_read_lock(); |
507 | list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) | |
15c831bf | 508 | set_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags); |
8383e460 | 509 | rcu_read_unlock(); |
1da177e4 LT |
510 | } |
511 | ||
512 | /* | |
513 | * Reap all unclaimed delegations after reboot recovery is done | |
514 | */ | |
adfa6f98 | 515 | void nfs_delegation_reap_unclaimed(struct nfs_client *clp) |
1da177e4 | 516 | { |
8383e460 | 517 | struct nfs_delegation *delegation; |
86e89489 | 518 | struct inode *inode; |
8383e460 TM |
519 | restart: |
520 | rcu_read_lock(); | |
521 | list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) { | |
15c831bf | 522 | if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) |
1da177e4 | 523 | continue; |
86e89489 TM |
524 | inode = nfs_delegation_grab_inode(delegation); |
525 | if (inode == NULL) | |
526 | continue; | |
8383e460 | 527 | spin_lock(&clp->cl_lock); |
86e89489 | 528 | delegation = nfs_detach_delegation_locked(NFS_I(inode), NULL); |
8383e460 TM |
529 | spin_unlock(&clp->cl_lock); |
530 | rcu_read_unlock(); | |
531 | if (delegation != NULL) | |
905f8d16 | 532 | nfs_free_delegation(delegation); |
86e89489 | 533 | iput(inode); |
8383e460 | 534 | goto restart; |
1da177e4 | 535 | } |
8383e460 | 536 | rcu_read_unlock(); |
1da177e4 | 537 | } |
3e4f6290 TM |
538 | |
539 | int nfs4_copy_delegation_stateid(nfs4_stateid *dst, struct inode *inode) | |
540 | { | |
3e4f6290 TM |
541 | struct nfs_inode *nfsi = NFS_I(inode); |
542 | struct nfs_delegation *delegation; | |
8383e460 | 543 | int ret = 0; |
3e4f6290 | 544 | |
8383e460 TM |
545 | rcu_read_lock(); |
546 | delegation = rcu_dereference(nfsi->delegation); | |
3e4f6290 TM |
547 | if (delegation != NULL) { |
548 | memcpy(dst->data, delegation->stateid.data, sizeof(dst->data)); | |
8383e460 | 549 | ret = 1; |
3e4f6290 | 550 | } |
8383e460 TM |
551 | rcu_read_unlock(); |
552 | return ret; | |
3e4f6290 | 553 | } |