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> | |
13 | #include <linux/spinlock.h> | |
14 | ||
15 | #include <linux/nfs4.h> | |
16 | #include <linux/nfs_fs.h> | |
17 | #include <linux/nfs_xdr.h> | |
18 | ||
4ce79717 | 19 | #include "nfs4_fs.h" |
1da177e4 | 20 | #include "delegation.h" |
24c8dbbb | 21 | #include "internal.h" |
1da177e4 | 22 | |
905f8d16 | 23 | static void nfs_do_free_delegation(struct nfs_delegation *delegation) |
1da177e4 | 24 | { |
1da177e4 LT |
25 | kfree(delegation); |
26 | } | |
27 | ||
8383e460 TM |
28 | static void nfs_free_delegation_callback(struct rcu_head *head) |
29 | { | |
30 | struct nfs_delegation *delegation = container_of(head, struct nfs_delegation, rcu); | |
31 | ||
905f8d16 TM |
32 | nfs_do_free_delegation(delegation); |
33 | } | |
34 | ||
35 | static void nfs_free_delegation(struct nfs_delegation *delegation) | |
36 | { | |
37 | struct rpc_cred *cred; | |
38 | ||
39 | cred = rcu_dereference(delegation->cred); | |
40 | rcu_assign_pointer(delegation->cred, NULL); | |
41 | call_rcu(&delegation->rcu, nfs_free_delegation_callback); | |
42 | if (cred) | |
43 | put_rpccred(cred); | |
8383e460 TM |
44 | } |
45 | ||
888e694c TM |
46 | static int nfs_delegation_claim_locks(struct nfs_open_context *ctx, struct nfs4_state *state) |
47 | { | |
48 | struct inode *inode = state->inode; | |
49 | struct file_lock *fl; | |
50 | int status; | |
51 | ||
90dc7d27 | 52 | for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) { |
888e694c TM |
53 | if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK))) |
54 | continue; | |
cd3758e3 | 55 | if (nfs_file_open_context(fl->fl_file) != ctx) |
888e694c TM |
56 | continue; |
57 | status = nfs4_lock_delegation_recall(state, fl); | |
58 | if (status >= 0) | |
59 | continue; | |
60 | switch (status) { | |
61 | default: | |
62 | printk(KERN_ERR "%s: unhandled error %d.\n", | |
3110ff80 | 63 | __func__, status); |
888e694c TM |
64 | case -NFS4ERR_EXPIRED: |
65 | /* kill_proc(fl->fl_pid, SIGLOST, 1); */ | |
66 | case -NFS4ERR_STALE_CLIENTID: | |
7539bbab | 67 | nfs4_schedule_state_recovery(NFS_SERVER(inode)->nfs_client); |
888e694c TM |
68 | goto out_err; |
69 | } | |
70 | } | |
71 | return 0; | |
72 | out_err: | |
73 | return status; | |
74 | } | |
75 | ||
90163027 | 76 | static void nfs_delegation_claim_opens(struct inode *inode, const nfs4_stateid *stateid) |
1da177e4 LT |
77 | { |
78 | struct nfs_inode *nfsi = NFS_I(inode); | |
79 | struct nfs_open_context *ctx; | |
80 | struct nfs4_state *state; | |
888e694c | 81 | int err; |
1da177e4 LT |
82 | |
83 | again: | |
84 | spin_lock(&inode->i_lock); | |
85 | list_for_each_entry(ctx, &nfsi->open_files, list) { | |
86 | state = ctx->state; | |
87 | if (state == NULL) | |
88 | continue; | |
89 | if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) | |
90 | continue; | |
90163027 TM |
91 | if (memcmp(state->stateid.data, stateid->data, sizeof(state->stateid.data)) != 0) |
92 | continue; | |
1da177e4 LT |
93 | get_nfs_open_context(ctx); |
94 | spin_unlock(&inode->i_lock); | |
13437e12 | 95 | err = nfs4_open_delegation_recall(ctx, state, stateid); |
888e694c TM |
96 | if (err >= 0) |
97 | err = nfs_delegation_claim_locks(ctx, state); | |
1da177e4 | 98 | put_nfs_open_context(ctx); |
888e694c TM |
99 | if (err != 0) |
100 | return; | |
1da177e4 LT |
101 | goto again; |
102 | } | |
103 | spin_unlock(&inode->i_lock); | |
104 | } | |
105 | ||
106 | /* | |
107 | * Set up a delegation on an inode | |
108 | */ | |
109 | void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res) | |
110 | { | |
111 | struct nfs_delegation *delegation = NFS_I(inode)->delegation; | |
05c88bab | 112 | struct rpc_cred *oldcred; |
1da177e4 LT |
113 | |
114 | if (delegation == NULL) | |
115 | return; | |
116 | memcpy(delegation->stateid.data, res->delegation.data, | |
117 | sizeof(delegation->stateid.data)); | |
118 | delegation->type = res->delegation_type; | |
119 | delegation->maxsize = res->maxsize; | |
05c88bab | 120 | oldcred = delegation->cred; |
1da177e4 LT |
121 | delegation->cred = get_rpccred(cred); |
122 | delegation->flags &= ~NFS_DELEGATION_NEED_RECLAIM; | |
123 | NFS_I(inode)->delegation_state = delegation->type; | |
124 | smp_wmb(); | |
05c88bab | 125 | put_rpccred(oldcred); |
1da177e4 LT |
126 | } |
127 | ||
57bfa891 TM |
128 | static int nfs_do_return_delegation(struct inode *inode, struct nfs_delegation *delegation, int issync) |
129 | { | |
130 | int res = 0; | |
131 | ||
132 | res = nfs4_proc_delegreturn(inode, delegation->cred, &delegation->stateid, issync); | |
133 | nfs_free_delegation(delegation); | |
134 | return res; | |
135 | } | |
136 | ||
137 | static struct nfs_delegation *nfs_detach_delegation_locked(struct nfs_inode *nfsi, const nfs4_stateid *stateid) | |
138 | { | |
139 | struct nfs_delegation *delegation = rcu_dereference(nfsi->delegation); | |
140 | ||
141 | if (delegation == NULL) | |
142 | goto nomatch; | |
34310430 | 143 | spin_lock(&delegation->lock); |
57bfa891 TM |
144 | if (stateid != NULL && memcmp(delegation->stateid.data, stateid->data, |
145 | sizeof(delegation->stateid.data)) != 0) | |
34310430 | 146 | goto nomatch_unlock; |
57bfa891 TM |
147 | list_del_rcu(&delegation->super_list); |
148 | nfsi->delegation_state = 0; | |
149 | rcu_assign_pointer(nfsi->delegation, NULL); | |
34310430 | 150 | spin_unlock(&delegation->lock); |
57bfa891 | 151 | return delegation; |
34310430 TM |
152 | nomatch_unlock: |
153 | spin_unlock(&delegation->lock); | |
57bfa891 TM |
154 | nomatch: |
155 | return NULL; | |
156 | } | |
157 | ||
1da177e4 LT |
158 | /* |
159 | * Set up a delegation on an inode | |
160 | */ | |
161 | int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res) | |
162 | { | |
7539bbab | 163 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; |
1da177e4 LT |
164 | struct nfs_inode *nfsi = NFS_I(inode); |
165 | struct nfs_delegation *delegation; | |
57bfa891 | 166 | struct nfs_delegation *freeme = NULL; |
1da177e4 LT |
167 | int status = 0; |
168 | ||
f52720ca | 169 | delegation = kmalloc(sizeof(*delegation), GFP_KERNEL); |
1da177e4 LT |
170 | if (delegation == NULL) |
171 | return -ENOMEM; | |
172 | memcpy(delegation->stateid.data, res->delegation.data, | |
173 | sizeof(delegation->stateid.data)); | |
174 | delegation->type = res->delegation_type; | |
175 | delegation->maxsize = res->maxsize; | |
beb2a5ec | 176 | delegation->change_attr = nfsi->change_attr; |
1da177e4 LT |
177 | delegation->cred = get_rpccred(cred); |
178 | delegation->inode = inode; | |
34310430 | 179 | spin_lock_init(&delegation->lock); |
1da177e4 LT |
180 | |
181 | spin_lock(&clp->cl_lock); | |
57bfa891 | 182 | if (rcu_dereference(nfsi->delegation) != NULL) { |
1da177e4 | 183 | if (memcmp(&delegation->stateid, &nfsi->delegation->stateid, |
57bfa891 TM |
184 | sizeof(delegation->stateid)) == 0 && |
185 | delegation->type == nfsi->delegation->type) { | |
186 | goto out; | |
1da177e4 | 187 | } |
57bfa891 TM |
188 | /* |
189 | * Deal with broken servers that hand out two | |
190 | * delegations for the same file. | |
191 | */ | |
192 | dfprintk(FILE, "%s: server %s handed out " | |
193 | "a duplicate delegation!\n", | |
3110ff80 | 194 | __func__, clp->cl_hostname); |
57bfa891 TM |
195 | if (delegation->type <= nfsi->delegation->type) { |
196 | freeme = delegation; | |
197 | delegation = NULL; | |
198 | goto out; | |
199 | } | |
200 | freeme = nfs_detach_delegation_locked(nfsi, NULL); | |
1da177e4 | 201 | } |
57bfa891 TM |
202 | list_add_rcu(&delegation->super_list, &clp->cl_delegations); |
203 | nfsi->delegation_state = delegation->type; | |
204 | rcu_assign_pointer(nfsi->delegation, delegation); | |
205 | delegation = NULL; | |
412c77ce TM |
206 | |
207 | /* Ensure we revalidate the attributes and page cache! */ | |
208 | spin_lock(&inode->i_lock); | |
209 | nfsi->cache_validity |= NFS_INO_REVAL_FORCED; | |
210 | spin_unlock(&inode->i_lock); | |
211 | ||
57bfa891 | 212 | out: |
1da177e4 | 213 | spin_unlock(&clp->cl_lock); |
603c83da TM |
214 | if (delegation != NULL) |
215 | nfs_free_delegation(delegation); | |
57bfa891 TM |
216 | if (freeme != NULL) |
217 | nfs_do_return_delegation(inode, freeme, 0); | |
1da177e4 LT |
218 | return status; |
219 | } | |
220 | ||
1da177e4 LT |
221 | /* Sync all data to disk upon delegation return */ |
222 | static void nfs_msync_inode(struct inode *inode) | |
223 | { | |
224 | filemap_fdatawrite(inode->i_mapping); | |
225 | nfs_wb_all(inode); | |
226 | filemap_fdatawait(inode->i_mapping); | |
227 | } | |
228 | ||
229 | /* | |
230 | * Basic procedure for returning a delegation to the server | |
231 | */ | |
90163027 | 232 | static int __nfs_inode_return_delegation(struct inode *inode, struct nfs_delegation *delegation) |
1da177e4 | 233 | { |
7539bbab | 234 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; |
1da177e4 | 235 | struct nfs_inode *nfsi = NFS_I(inode); |
1da177e4 LT |
236 | |
237 | nfs_msync_inode(inode); | |
238 | down_read(&clp->cl_sem); | |
239 | /* Guard against new delegated open calls */ | |
240 | down_write(&nfsi->rwsem); | |
90163027 | 241 | nfs_delegation_claim_opens(inode, &delegation->stateid); |
1da177e4 LT |
242 | up_write(&nfsi->rwsem); |
243 | up_read(&clp->cl_sem); | |
244 | nfs_msync_inode(inode); | |
245 | ||
e6f81075 | 246 | return nfs_do_return_delegation(inode, delegation, 1); |
90163027 TM |
247 | } |
248 | ||
e6f81075 TM |
249 | /* |
250 | * This function returns the delegation without reclaiming opens | |
251 | * or protecting against delegation reclaims. | |
252 | * It is therefore really only safe to be called from | |
253 | * nfs4_clear_inode() | |
254 | */ | |
255 | void nfs_inode_return_delegation_noreclaim(struct inode *inode) | |
256 | { | |
257 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; | |
258 | struct nfs_inode *nfsi = NFS_I(inode); | |
259 | struct nfs_delegation *delegation; | |
260 | ||
261 | if (rcu_dereference(nfsi->delegation) != NULL) { | |
262 | spin_lock(&clp->cl_lock); | |
263 | delegation = nfs_detach_delegation_locked(nfsi, NULL); | |
264 | spin_unlock(&clp->cl_lock); | |
265 | if (delegation != NULL) | |
266 | nfs_do_return_delegation(inode, delegation, 0); | |
267 | } | |
268 | } | |
269 | ||
90163027 TM |
270 | int nfs_inode_return_delegation(struct inode *inode) |
271 | { | |
272 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; | |
273 | struct nfs_inode *nfsi = NFS_I(inode); | |
274 | struct nfs_delegation *delegation; | |
275 | int err = 0; | |
276 | ||
8383e460 | 277 | if (rcu_dereference(nfsi->delegation) != NULL) { |
90163027 TM |
278 | spin_lock(&clp->cl_lock); |
279 | delegation = nfs_detach_delegation_locked(nfsi, NULL); | |
280 | spin_unlock(&clp->cl_lock); | |
281 | if (delegation != NULL) | |
282 | err = __nfs_inode_return_delegation(inode, delegation); | |
283 | } | |
284 | return err; | |
1da177e4 LT |
285 | } |
286 | ||
287 | /* | |
288 | * Return all delegations associated to a super block | |
289 | */ | |
290 | void nfs_return_all_delegations(struct super_block *sb) | |
291 | { | |
7539bbab | 292 | struct nfs_client *clp = NFS_SB(sb)->nfs_client; |
1da177e4 LT |
293 | struct nfs_delegation *delegation; |
294 | struct inode *inode; | |
295 | ||
296 | if (clp == NULL) | |
297 | return; | |
298 | restart: | |
8383e460 TM |
299 | rcu_read_lock(); |
300 | list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) { | |
1da177e4 LT |
301 | if (delegation->inode->i_sb != sb) |
302 | continue; | |
303 | inode = igrab(delegation->inode); | |
304 | if (inode == NULL) | |
305 | continue; | |
8383e460 TM |
306 | spin_lock(&clp->cl_lock); |
307 | delegation = nfs_detach_delegation_locked(NFS_I(inode), NULL); | |
1da177e4 | 308 | spin_unlock(&clp->cl_lock); |
8383e460 TM |
309 | rcu_read_unlock(); |
310 | if (delegation != NULL) | |
311 | __nfs_inode_return_delegation(inode, delegation); | |
1da177e4 LT |
312 | iput(inode); |
313 | goto restart; | |
314 | } | |
8383e460 | 315 | rcu_read_unlock(); |
1da177e4 LT |
316 | } |
317 | ||
10afec90 | 318 | static int nfs_do_expire_all_delegations(void *ptr) |
58d9714a | 319 | { |
adfa6f98 | 320 | struct nfs_client *clp = ptr; |
58d9714a TM |
321 | struct nfs_delegation *delegation; |
322 | struct inode *inode; | |
58d9714a TM |
323 | |
324 | allow_signal(SIGKILL); | |
325 | restart: | |
58d9714a TM |
326 | if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) != 0) |
327 | goto out; | |
328 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) | |
329 | goto out; | |
8383e460 TM |
330 | rcu_read_lock(); |
331 | list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) { | |
58d9714a TM |
332 | inode = igrab(delegation->inode); |
333 | if (inode == NULL) | |
334 | continue; | |
8383e460 TM |
335 | spin_lock(&clp->cl_lock); |
336 | delegation = nfs_detach_delegation_locked(NFS_I(inode), NULL); | |
58d9714a | 337 | spin_unlock(&clp->cl_lock); |
8383e460 TM |
338 | rcu_read_unlock(); |
339 | if (delegation) | |
340 | __nfs_inode_return_delegation(inode, delegation); | |
58d9714a | 341 | iput(inode); |
26c78e15 | 342 | goto restart; |
58d9714a | 343 | } |
8383e460 | 344 | rcu_read_unlock(); |
58d9714a | 345 | out: |
24c8dbbb | 346 | nfs_put_client(clp); |
58d9714a TM |
347 | module_put_and_exit(0); |
348 | } | |
349 | ||
adfa6f98 | 350 | void nfs_expire_all_delegations(struct nfs_client *clp) |
58d9714a TM |
351 | { |
352 | struct task_struct *task; | |
353 | ||
354 | __module_get(THIS_MODULE); | |
355 | atomic_inc(&clp->cl_count); | |
356 | task = kthread_run(nfs_do_expire_all_delegations, clp, | |
5d8515ca CL |
357 | "%s-delegreturn", |
358 | rpc_peeraddr2str(clp->cl_rpcclient, | |
359 | RPC_DISPLAY_ADDR)); | |
58d9714a TM |
360 | if (!IS_ERR(task)) |
361 | return; | |
24c8dbbb | 362 | nfs_put_client(clp); |
58d9714a TM |
363 | module_put(THIS_MODULE); |
364 | } | |
365 | ||
1da177e4 LT |
366 | /* |
367 | * Return all delegations following an NFS4ERR_CB_PATH_DOWN error. | |
368 | */ | |
adfa6f98 | 369 | void nfs_handle_cb_pathdown(struct nfs_client *clp) |
1da177e4 LT |
370 | { |
371 | struct nfs_delegation *delegation; | |
372 | struct inode *inode; | |
373 | ||
374 | if (clp == NULL) | |
375 | return; | |
376 | restart: | |
8383e460 TM |
377 | rcu_read_lock(); |
378 | list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) { | |
1da177e4 LT |
379 | inode = igrab(delegation->inode); |
380 | if (inode == NULL) | |
381 | continue; | |
8383e460 TM |
382 | spin_lock(&clp->cl_lock); |
383 | delegation = nfs_detach_delegation_locked(NFS_I(inode), NULL); | |
1da177e4 | 384 | spin_unlock(&clp->cl_lock); |
8383e460 TM |
385 | rcu_read_unlock(); |
386 | if (delegation != NULL) | |
387 | __nfs_inode_return_delegation(inode, delegation); | |
1da177e4 LT |
388 | iput(inode); |
389 | goto restart; | |
390 | } | |
8383e460 | 391 | rcu_read_unlock(); |
1da177e4 LT |
392 | } |
393 | ||
394 | struct recall_threadargs { | |
395 | struct inode *inode; | |
adfa6f98 | 396 | struct nfs_client *clp; |
1da177e4 LT |
397 | const nfs4_stateid *stateid; |
398 | ||
399 | struct completion started; | |
400 | int result; | |
401 | }; | |
402 | ||
403 | static int recall_thread(void *data) | |
404 | { | |
405 | struct recall_threadargs *args = (struct recall_threadargs *)data; | |
406 | struct inode *inode = igrab(args->inode); | |
7539bbab | 407 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; |
1da177e4 LT |
408 | struct nfs_inode *nfsi = NFS_I(inode); |
409 | struct nfs_delegation *delegation; | |
410 | ||
411 | daemonize("nfsv4-delegreturn"); | |
412 | ||
413 | nfs_msync_inode(inode); | |
414 | down_read(&clp->cl_sem); | |
415 | down_write(&nfsi->rwsem); | |
416 | spin_lock(&clp->cl_lock); | |
90163027 TM |
417 | delegation = nfs_detach_delegation_locked(nfsi, args->stateid); |
418 | if (delegation != NULL) | |
1da177e4 | 419 | args->result = 0; |
90163027 | 420 | else |
1da177e4 | 421 | args->result = -ENOENT; |
1da177e4 LT |
422 | spin_unlock(&clp->cl_lock); |
423 | complete(&args->started); | |
90163027 | 424 | nfs_delegation_claim_opens(inode, args->stateid); |
1da177e4 LT |
425 | up_write(&nfsi->rwsem); |
426 | up_read(&clp->cl_sem); | |
427 | nfs_msync_inode(inode); | |
428 | ||
429 | if (delegation != NULL) | |
e6f81075 | 430 | nfs_do_return_delegation(inode, delegation, 1); |
1da177e4 LT |
431 | iput(inode); |
432 | module_put_and_exit(0); | |
433 | } | |
434 | ||
435 | /* | |
436 | * Asynchronous delegation recall! | |
437 | */ | |
438 | int nfs_async_inode_return_delegation(struct inode *inode, const nfs4_stateid *stateid) | |
439 | { | |
440 | struct recall_threadargs data = { | |
441 | .inode = inode, | |
442 | .stateid = stateid, | |
443 | }; | |
444 | int status; | |
445 | ||
446 | init_completion(&data.started); | |
447 | __module_get(THIS_MODULE); | |
448 | status = kernel_thread(recall_thread, &data, CLONE_KERNEL); | |
449 | if (status < 0) | |
450 | goto out_module_put; | |
451 | wait_for_completion(&data.started); | |
452 | return data.result; | |
453 | out_module_put: | |
454 | module_put(THIS_MODULE); | |
455 | return status; | |
456 | } | |
457 | ||
458 | /* | |
459 | * Retrieve the inode associated with a delegation | |
460 | */ | |
adfa6f98 | 461 | struct inode *nfs_delegation_find_inode(struct nfs_client *clp, const struct nfs_fh *fhandle) |
1da177e4 LT |
462 | { |
463 | struct nfs_delegation *delegation; | |
464 | struct inode *res = NULL; | |
8383e460 TM |
465 | rcu_read_lock(); |
466 | list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) { | |
1da177e4 LT |
467 | if (nfs_compare_fh(fhandle, &NFS_I(delegation->inode)->fh) == 0) { |
468 | res = igrab(delegation->inode); | |
469 | break; | |
470 | } | |
471 | } | |
8383e460 | 472 | rcu_read_unlock(); |
1da177e4 LT |
473 | return res; |
474 | } | |
475 | ||
476 | /* | |
477 | * Mark all delegations as needing to be reclaimed | |
478 | */ | |
adfa6f98 | 479 | void nfs_delegation_mark_reclaim(struct nfs_client *clp) |
1da177e4 LT |
480 | { |
481 | struct nfs_delegation *delegation; | |
8383e460 TM |
482 | rcu_read_lock(); |
483 | list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) | |
1da177e4 | 484 | delegation->flags |= NFS_DELEGATION_NEED_RECLAIM; |
8383e460 | 485 | rcu_read_unlock(); |
1da177e4 LT |
486 | } |
487 | ||
488 | /* | |
489 | * Reap all unclaimed delegations after reboot recovery is done | |
490 | */ | |
adfa6f98 | 491 | void nfs_delegation_reap_unclaimed(struct nfs_client *clp) |
1da177e4 | 492 | { |
8383e460 TM |
493 | struct nfs_delegation *delegation; |
494 | restart: | |
495 | rcu_read_lock(); | |
496 | list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) { | |
1da177e4 LT |
497 | if ((delegation->flags & NFS_DELEGATION_NEED_RECLAIM) == 0) |
498 | continue; | |
8383e460 TM |
499 | spin_lock(&clp->cl_lock); |
500 | delegation = nfs_detach_delegation_locked(NFS_I(delegation->inode), NULL); | |
501 | spin_unlock(&clp->cl_lock); | |
502 | rcu_read_unlock(); | |
503 | if (delegation != NULL) | |
905f8d16 | 504 | nfs_free_delegation(delegation); |
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 | } |