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 | ||
90163027 | 95 | static void 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 TM |
118 | if (err != 0) |
119 | return; | |
1da177e4 LT |
120 | goto again; |
121 | } | |
122 | spin_unlock(&inode->i_lock); | |
123 | } | |
124 | ||
125 | /* | |
126 | * Set up a delegation on an inode | |
127 | */ | |
128 | void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res) | |
129 | { | |
130 | struct nfs_delegation *delegation = NFS_I(inode)->delegation; | |
05c88bab | 131 | struct rpc_cred *oldcred; |
1da177e4 LT |
132 | |
133 | if (delegation == NULL) | |
134 | return; | |
135 | memcpy(delegation->stateid.data, res->delegation.data, | |
136 | sizeof(delegation->stateid.data)); | |
137 | delegation->type = res->delegation_type; | |
138 | delegation->maxsize = res->maxsize; | |
05c88bab | 139 | oldcred = delegation->cred; |
1da177e4 | 140 | delegation->cred = get_rpccred(cred); |
15c831bf | 141 | clear_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags); |
1da177e4 LT |
142 | NFS_I(inode)->delegation_state = delegation->type; |
143 | smp_wmb(); | |
05c88bab | 144 | put_rpccred(oldcred); |
1da177e4 LT |
145 | } |
146 | ||
57bfa891 TM |
147 | static int nfs_do_return_delegation(struct inode *inode, struct nfs_delegation *delegation, int issync) |
148 | { | |
149 | int res = 0; | |
150 | ||
151 | res = nfs4_proc_delegreturn(inode, delegation->cred, &delegation->stateid, issync); | |
152 | nfs_free_delegation(delegation); | |
153 | return res; | |
154 | } | |
155 | ||
86e89489 TM |
156 | static struct inode *nfs_delegation_grab_inode(struct nfs_delegation *delegation) |
157 | { | |
158 | struct inode *inode = NULL; | |
159 | ||
160 | spin_lock(&delegation->lock); | |
161 | if (delegation->inode != NULL) | |
162 | inode = igrab(delegation->inode); | |
163 | spin_unlock(&delegation->lock); | |
164 | return inode; | |
165 | } | |
166 | ||
57bfa891 TM |
167 | static struct nfs_delegation *nfs_detach_delegation_locked(struct nfs_inode *nfsi, const nfs4_stateid *stateid) |
168 | { | |
169 | struct nfs_delegation *delegation = rcu_dereference(nfsi->delegation); | |
170 | ||
171 | if (delegation == NULL) | |
172 | goto nomatch; | |
34310430 | 173 | spin_lock(&delegation->lock); |
57bfa891 TM |
174 | if (stateid != NULL && memcmp(delegation->stateid.data, stateid->data, |
175 | sizeof(delegation->stateid.data)) != 0) | |
34310430 | 176 | goto nomatch_unlock; |
57bfa891 | 177 | list_del_rcu(&delegation->super_list); |
86e89489 | 178 | delegation->inode = NULL; |
57bfa891 TM |
179 | nfsi->delegation_state = 0; |
180 | rcu_assign_pointer(nfsi->delegation, NULL); | |
34310430 | 181 | spin_unlock(&delegation->lock); |
57bfa891 | 182 | return delegation; |
34310430 TM |
183 | nomatch_unlock: |
184 | spin_unlock(&delegation->lock); | |
57bfa891 TM |
185 | nomatch: |
186 | return NULL; | |
187 | } | |
188 | ||
1da177e4 LT |
189 | /* |
190 | * Set up a delegation on an inode | |
191 | */ | |
192 | int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res) | |
193 | { | |
7539bbab | 194 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; |
1da177e4 LT |
195 | struct nfs_inode *nfsi = NFS_I(inode); |
196 | struct nfs_delegation *delegation; | |
57bfa891 | 197 | struct nfs_delegation *freeme = NULL; |
1da177e4 LT |
198 | int status = 0; |
199 | ||
f52720ca | 200 | delegation = kmalloc(sizeof(*delegation), GFP_KERNEL); |
1da177e4 LT |
201 | if (delegation == NULL) |
202 | return -ENOMEM; | |
203 | memcpy(delegation->stateid.data, res->delegation.data, | |
204 | sizeof(delegation->stateid.data)); | |
205 | delegation->type = res->delegation_type; | |
206 | delegation->maxsize = res->maxsize; | |
beb2a5ec | 207 | delegation->change_attr = nfsi->change_attr; |
1da177e4 LT |
208 | delegation->cred = get_rpccred(cred); |
209 | delegation->inode = inode; | |
b7391f44 | 210 | delegation->flags = 1<<NFS_DELEGATION_REFERENCED; |
34310430 | 211 | spin_lock_init(&delegation->lock); |
1da177e4 LT |
212 | |
213 | spin_lock(&clp->cl_lock); | |
57bfa891 | 214 | if (rcu_dereference(nfsi->delegation) != NULL) { |
1da177e4 | 215 | if (memcmp(&delegation->stateid, &nfsi->delegation->stateid, |
57bfa891 TM |
216 | sizeof(delegation->stateid)) == 0 && |
217 | delegation->type == nfsi->delegation->type) { | |
218 | goto out; | |
1da177e4 | 219 | } |
57bfa891 TM |
220 | /* |
221 | * Deal with broken servers that hand out two | |
222 | * delegations for the same file. | |
223 | */ | |
224 | dfprintk(FILE, "%s: server %s handed out " | |
225 | "a duplicate delegation!\n", | |
3110ff80 | 226 | __func__, clp->cl_hostname); |
57bfa891 TM |
227 | if (delegation->type <= nfsi->delegation->type) { |
228 | freeme = delegation; | |
229 | delegation = NULL; | |
230 | goto out; | |
231 | } | |
232 | freeme = nfs_detach_delegation_locked(nfsi, NULL); | |
1da177e4 | 233 | } |
57bfa891 TM |
234 | list_add_rcu(&delegation->super_list, &clp->cl_delegations); |
235 | nfsi->delegation_state = delegation->type; | |
236 | rcu_assign_pointer(nfsi->delegation, delegation); | |
237 | delegation = NULL; | |
412c77ce TM |
238 | |
239 | /* Ensure we revalidate the attributes and page cache! */ | |
240 | spin_lock(&inode->i_lock); | |
241 | nfsi->cache_validity |= NFS_INO_REVAL_FORCED; | |
242 | spin_unlock(&inode->i_lock); | |
243 | ||
57bfa891 | 244 | out: |
1da177e4 | 245 | spin_unlock(&clp->cl_lock); |
603c83da TM |
246 | if (delegation != NULL) |
247 | nfs_free_delegation(delegation); | |
57bfa891 TM |
248 | if (freeme != NULL) |
249 | nfs_do_return_delegation(inode, freeme, 0); | |
1da177e4 LT |
250 | return status; |
251 | } | |
252 | ||
1da177e4 LT |
253 | /* Sync all data to disk upon delegation return */ |
254 | static void nfs_msync_inode(struct inode *inode) | |
255 | { | |
256 | filemap_fdatawrite(inode->i_mapping); | |
257 | nfs_wb_all(inode); | |
258 | filemap_fdatawait(inode->i_mapping); | |
259 | } | |
260 | ||
261 | /* | |
262 | * Basic procedure for returning a delegation to the server | |
263 | */ | |
90163027 | 264 | static int __nfs_inode_return_delegation(struct inode *inode, struct nfs_delegation *delegation) |
1da177e4 | 265 | { |
1da177e4 | 266 | struct nfs_inode *nfsi = NFS_I(inode); |
1da177e4 LT |
267 | |
268 | nfs_msync_inode(inode); | |
3f09df70 TM |
269 | /* |
270 | * Guard against new delegated open/lock/unlock calls and against | |
271 | * state recovery | |
272 | */ | |
1da177e4 | 273 | down_write(&nfsi->rwsem); |
90163027 | 274 | nfs_delegation_claim_opens(inode, &delegation->stateid); |
1da177e4 | 275 | up_write(&nfsi->rwsem); |
1da177e4 LT |
276 | nfs_msync_inode(inode); |
277 | ||
e6f81075 | 278 | return nfs_do_return_delegation(inode, delegation, 1); |
90163027 TM |
279 | } |
280 | ||
515d8611 TM |
281 | /* |
282 | * Return all delegations that have been marked for return | |
283 | */ | |
707fb4b3 | 284 | void nfs_client_return_marked_delegations(struct nfs_client *clp) |
515d8611 TM |
285 | { |
286 | struct nfs_delegation *delegation; | |
287 | struct inode *inode; | |
288 | ||
289 | restart: | |
290 | rcu_read_lock(); | |
291 | list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) { | |
292 | if (!test_and_clear_bit(NFS_DELEGATION_RETURN, &delegation->flags)) | |
293 | continue; | |
294 | inode = nfs_delegation_grab_inode(delegation); | |
295 | if (inode == NULL) | |
296 | continue; | |
297 | spin_lock(&clp->cl_lock); | |
298 | delegation = nfs_detach_delegation_locked(NFS_I(inode), NULL); | |
299 | spin_unlock(&clp->cl_lock); | |
300 | rcu_read_unlock(); | |
301 | if (delegation != NULL) | |
302 | __nfs_inode_return_delegation(inode, delegation); | |
303 | iput(inode); | |
304 | goto restart; | |
305 | } | |
306 | rcu_read_unlock(); | |
307 | } | |
308 | ||
e6f81075 TM |
309 | /* |
310 | * This function returns the delegation without reclaiming opens | |
311 | * or protecting against delegation reclaims. | |
312 | * It is therefore really only safe to be called from | |
313 | * nfs4_clear_inode() | |
314 | */ | |
315 | void nfs_inode_return_delegation_noreclaim(struct inode *inode) | |
316 | { | |
317 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; | |
318 | struct nfs_inode *nfsi = NFS_I(inode); | |
319 | struct nfs_delegation *delegation; | |
320 | ||
321 | if (rcu_dereference(nfsi->delegation) != NULL) { | |
322 | spin_lock(&clp->cl_lock); | |
323 | delegation = nfs_detach_delegation_locked(nfsi, NULL); | |
324 | spin_unlock(&clp->cl_lock); | |
325 | if (delegation != NULL) | |
326 | nfs_do_return_delegation(inode, delegation, 0); | |
327 | } | |
328 | } | |
329 | ||
90163027 TM |
330 | int nfs_inode_return_delegation(struct inode *inode) |
331 | { | |
332 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; | |
333 | struct nfs_inode *nfsi = NFS_I(inode); | |
334 | struct nfs_delegation *delegation; | |
335 | int err = 0; | |
336 | ||
8383e460 | 337 | if (rcu_dereference(nfsi->delegation) != NULL) { |
90163027 TM |
338 | spin_lock(&clp->cl_lock); |
339 | delegation = nfs_detach_delegation_locked(nfsi, NULL); | |
340 | spin_unlock(&clp->cl_lock); | |
341 | if (delegation != NULL) | |
342 | err = __nfs_inode_return_delegation(inode, delegation); | |
343 | } | |
344 | return err; | |
1da177e4 LT |
345 | } |
346 | ||
6411bd4a TM |
347 | static void nfs_mark_return_delegation(struct nfs_client *clp, struct nfs_delegation *delegation) |
348 | { | |
349 | set_bit(NFS_DELEGATION_RETURN, &delegation->flags); | |
350 | set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state); | |
351 | } | |
352 | ||
1da177e4 LT |
353 | /* |
354 | * Return all delegations associated to a super block | |
355 | */ | |
515d8611 | 356 | void nfs_super_return_all_delegations(struct super_block *sb) |
1da177e4 | 357 | { |
7539bbab | 358 | struct nfs_client *clp = NFS_SB(sb)->nfs_client; |
1da177e4 | 359 | struct nfs_delegation *delegation; |
1da177e4 LT |
360 | |
361 | if (clp == NULL) | |
362 | return; | |
8383e460 TM |
363 | rcu_read_lock(); |
364 | list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) { | |
86e89489 TM |
365 | spin_lock(&delegation->lock); |
366 | if (delegation->inode != NULL && delegation->inode->i_sb == sb) | |
515d8611 | 367 | set_bit(NFS_DELEGATION_RETURN, &delegation->flags); |
86e89489 | 368 | spin_unlock(&delegation->lock); |
1da177e4 | 369 | } |
8383e460 | 370 | rcu_read_unlock(); |
515d8611 TM |
371 | nfs_client_return_marked_delegations(clp); |
372 | } | |
373 | ||
707fb4b3 | 374 | static void nfs_client_mark_return_all_delegations(struct nfs_client *clp) |
515d8611 TM |
375 | { |
376 | struct nfs_delegation *delegation; | |
377 | ||
378 | rcu_read_lock(); | |
707fb4b3 | 379 | list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) { |
515d8611 | 380 | set_bit(NFS_DELEGATION_RETURN, &delegation->flags); |
707fb4b3 TM |
381 | set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state); |
382 | } | |
515d8611 | 383 | rcu_read_unlock(); |
1da177e4 LT |
384 | } |
385 | ||
b0d3ded1 | 386 | static void nfs_delegation_run_state_manager(struct nfs_client *clp) |
58d9714a | 387 | { |
b0d3ded1 TM |
388 | if (test_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) |
389 | nfs4_schedule_state_manager(clp); | |
58d9714a TM |
390 | } |
391 | ||
adfa6f98 | 392 | void nfs_expire_all_delegations(struct nfs_client *clp) |
58d9714a | 393 | { |
b0d3ded1 TM |
394 | nfs_client_mark_return_all_delegations(clp); |
395 | nfs_delegation_run_state_manager(clp); | |
58d9714a TM |
396 | } |
397 | ||
1da177e4 LT |
398 | /* |
399 | * Return all delegations following an NFS4ERR_CB_PATH_DOWN error. | |
400 | */ | |
adfa6f98 | 401 | void nfs_handle_cb_pathdown(struct nfs_client *clp) |
1da177e4 | 402 | { |
1da177e4 LT |
403 | if (clp == NULL) |
404 | return; | |
707fb4b3 | 405 | nfs_client_mark_return_all_delegations(clp); |
1da177e4 LT |
406 | } |
407 | ||
b7391f44 TM |
408 | static void nfs_client_mark_return_unreferenced_delegations(struct nfs_client *clp) |
409 | { | |
410 | struct nfs_delegation *delegation; | |
411 | ||
412 | rcu_read_lock(); | |
413 | list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) { | |
414 | if (test_and_clear_bit(NFS_DELEGATION_REFERENCED, &delegation->flags)) | |
415 | continue; | |
416 | set_bit(NFS_DELEGATION_RETURN, &delegation->flags); | |
417 | set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state); | |
418 | } | |
419 | rcu_read_unlock(); | |
420 | } | |
421 | ||
422 | void nfs_expire_unreferenced_delegations(struct nfs_client *clp) | |
423 | { | |
424 | nfs_client_mark_return_unreferenced_delegations(clp); | |
425 | nfs_delegation_run_state_manager(clp); | |
426 | } | |
427 | ||
1da177e4 LT |
428 | /* |
429 | * Asynchronous delegation recall! | |
430 | */ | |
431 | int nfs_async_inode_return_delegation(struct inode *inode, const nfs4_stateid *stateid) | |
432 | { | |
6411bd4a TM |
433 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; |
434 | struct nfs_delegation *delegation; | |
1da177e4 | 435 | |
6411bd4a TM |
436 | rcu_read_lock(); |
437 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
438 | if (delegation == NULL || memcmp(delegation->stateid.data, stateid->data, | |
439 | sizeof(delegation->stateid.data)) != 0) { | |
440 | rcu_read_unlock(); | |
441 | return -ENOENT; | |
442 | } | |
443 | nfs_mark_return_delegation(clp, delegation); | |
444 | rcu_read_unlock(); | |
445 | nfs_delegation_run_state_manager(clp); | |
446 | return 0; | |
1da177e4 LT |
447 | } |
448 | ||
449 | /* | |
450 | * Retrieve the inode associated with a delegation | |
451 | */ | |
adfa6f98 | 452 | struct inode *nfs_delegation_find_inode(struct nfs_client *clp, const struct nfs_fh *fhandle) |
1da177e4 LT |
453 | { |
454 | struct nfs_delegation *delegation; | |
455 | struct inode *res = NULL; | |
8383e460 TM |
456 | rcu_read_lock(); |
457 | list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) { | |
86e89489 TM |
458 | spin_lock(&delegation->lock); |
459 | if (delegation->inode != NULL && | |
460 | nfs_compare_fh(fhandle, &NFS_I(delegation->inode)->fh) == 0) { | |
1da177e4 | 461 | res = igrab(delegation->inode); |
1da177e4 | 462 | } |
86e89489 TM |
463 | spin_unlock(&delegation->lock); |
464 | if (res != NULL) | |
465 | break; | |
1da177e4 | 466 | } |
8383e460 | 467 | rcu_read_unlock(); |
1da177e4 LT |
468 | return res; |
469 | } | |
470 | ||
471 | /* | |
472 | * Mark all delegations as needing to be reclaimed | |
473 | */ | |
adfa6f98 | 474 | void nfs_delegation_mark_reclaim(struct nfs_client *clp) |
1da177e4 LT |
475 | { |
476 | struct nfs_delegation *delegation; | |
8383e460 TM |
477 | rcu_read_lock(); |
478 | list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) | |
15c831bf | 479 | set_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags); |
8383e460 | 480 | rcu_read_unlock(); |
1da177e4 LT |
481 | } |
482 | ||
483 | /* | |
484 | * Reap all unclaimed delegations after reboot recovery is done | |
485 | */ | |
adfa6f98 | 486 | void nfs_delegation_reap_unclaimed(struct nfs_client *clp) |
1da177e4 | 487 | { |
8383e460 | 488 | struct nfs_delegation *delegation; |
86e89489 | 489 | struct inode *inode; |
8383e460 TM |
490 | restart: |
491 | rcu_read_lock(); | |
492 | list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) { | |
15c831bf | 493 | if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) |
1da177e4 | 494 | continue; |
86e89489 TM |
495 | inode = nfs_delegation_grab_inode(delegation); |
496 | if (inode == NULL) | |
497 | continue; | |
8383e460 | 498 | spin_lock(&clp->cl_lock); |
86e89489 | 499 | delegation = nfs_detach_delegation_locked(NFS_I(inode), NULL); |
8383e460 TM |
500 | spin_unlock(&clp->cl_lock); |
501 | rcu_read_unlock(); | |
502 | if (delegation != NULL) | |
905f8d16 | 503 | nfs_free_delegation(delegation); |
86e89489 | 504 | iput(inode); |
8383e460 | 505 | goto restart; |
1da177e4 | 506 | } |
8383e460 | 507 | rcu_read_unlock(); |
1da177e4 | 508 | } |
3e4f6290 TM |
509 | |
510 | int nfs4_copy_delegation_stateid(nfs4_stateid *dst, struct inode *inode) | |
511 | { | |
3e4f6290 TM |
512 | struct nfs_inode *nfsi = NFS_I(inode); |
513 | struct nfs_delegation *delegation; | |
8383e460 | 514 | int ret = 0; |
3e4f6290 | 515 | |
8383e460 TM |
516 | rcu_read_lock(); |
517 | delegation = rcu_dereference(nfsi->delegation); | |
3e4f6290 TM |
518 | if (delegation != NULL) { |
519 | memcpy(dst->data, delegation->stateid.data, sizeof(dst->data)); | |
8383e460 | 520 | ret = 1; |
3e4f6290 | 521 | } |
8383e460 TM |
522 | rcu_read_unlock(); |
523 | return ret; | |
3e4f6290 | 524 | } |