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 | ||
b7391f44 TM |
46 | void nfs_mark_delegation_referenced(struct nfs_delegation *delegation) |
47 | { | |
48 | set_bit(NFS_DELEGATION_REFERENCED, &delegation->flags); | |
49 | } | |
50 | ||
51 | int nfs_have_delegation(struct inode *inode, int flags) | |
52 | { | |
53 | struct nfs_delegation *delegation; | |
54 | int ret = 0; | |
55 | ||
56 | flags &= FMODE_READ|FMODE_WRITE; | |
57 | rcu_read_lock(); | |
58 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
59 | if (delegation != NULL && (delegation->type & flags) == flags) { | |
60 | nfs_mark_delegation_referenced(delegation); | |
61 | ret = 1; | |
62 | } | |
63 | rcu_read_unlock(); | |
64 | return ret; | |
65 | } | |
66 | ||
888e694c TM |
67 | static int nfs_delegation_claim_locks(struct nfs_open_context *ctx, struct nfs4_state *state) |
68 | { | |
69 | struct inode *inode = state->inode; | |
70 | struct file_lock *fl; | |
71 | int status; | |
72 | ||
90dc7d27 | 73 | for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) { |
888e694c TM |
74 | if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK))) |
75 | continue; | |
cd3758e3 | 76 | if (nfs_file_open_context(fl->fl_file) != ctx) |
888e694c TM |
77 | continue; |
78 | status = nfs4_lock_delegation_recall(state, fl); | |
79 | if (status >= 0) | |
80 | continue; | |
81 | switch (status) { | |
82 | default: | |
83 | printk(KERN_ERR "%s: unhandled error %d.\n", | |
3110ff80 | 84 | __func__, status); |
888e694c TM |
85 | case -NFS4ERR_EXPIRED: |
86 | /* kill_proc(fl->fl_pid, SIGLOST, 1); */ | |
87 | case -NFS4ERR_STALE_CLIENTID: | |
7539bbab | 88 | nfs4_schedule_state_recovery(NFS_SERVER(inode)->nfs_client); |
888e694c TM |
89 | goto out_err; |
90 | } | |
91 | } | |
92 | return 0; | |
93 | out_err: | |
94 | return status; | |
95 | } | |
96 | ||
90163027 | 97 | static void nfs_delegation_claim_opens(struct inode *inode, const nfs4_stateid *stateid) |
1da177e4 LT |
98 | { |
99 | struct nfs_inode *nfsi = NFS_I(inode); | |
100 | struct nfs_open_context *ctx; | |
101 | struct nfs4_state *state; | |
888e694c | 102 | int err; |
1da177e4 LT |
103 | |
104 | again: | |
105 | spin_lock(&inode->i_lock); | |
106 | list_for_each_entry(ctx, &nfsi->open_files, list) { | |
107 | state = ctx->state; | |
108 | if (state == NULL) | |
109 | continue; | |
110 | if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) | |
111 | continue; | |
90163027 TM |
112 | if (memcmp(state->stateid.data, stateid->data, sizeof(state->stateid.data)) != 0) |
113 | continue; | |
1da177e4 LT |
114 | get_nfs_open_context(ctx); |
115 | spin_unlock(&inode->i_lock); | |
13437e12 | 116 | err = nfs4_open_delegation_recall(ctx, state, stateid); |
888e694c TM |
117 | if (err >= 0) |
118 | err = nfs_delegation_claim_locks(ctx, state); | |
1da177e4 | 119 | put_nfs_open_context(ctx); |
888e694c TM |
120 | if (err != 0) |
121 | return; | |
1da177e4 LT |
122 | goto again; |
123 | } | |
124 | spin_unlock(&inode->i_lock); | |
125 | } | |
126 | ||
127 | /* | |
128 | * Set up a delegation on an inode | |
129 | */ | |
130 | void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res) | |
131 | { | |
132 | struct nfs_delegation *delegation = NFS_I(inode)->delegation; | |
05c88bab | 133 | struct rpc_cred *oldcred; |
1da177e4 LT |
134 | |
135 | if (delegation == NULL) | |
136 | return; | |
137 | memcpy(delegation->stateid.data, res->delegation.data, | |
138 | sizeof(delegation->stateid.data)); | |
139 | delegation->type = res->delegation_type; | |
140 | delegation->maxsize = res->maxsize; | |
05c88bab | 141 | oldcred = delegation->cred; |
1da177e4 | 142 | delegation->cred = get_rpccred(cred); |
15c831bf | 143 | clear_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags); |
1da177e4 LT |
144 | NFS_I(inode)->delegation_state = delegation->type; |
145 | smp_wmb(); | |
05c88bab | 146 | put_rpccred(oldcred); |
1da177e4 LT |
147 | } |
148 | ||
57bfa891 TM |
149 | static int nfs_do_return_delegation(struct inode *inode, struct nfs_delegation *delegation, int issync) |
150 | { | |
151 | int res = 0; | |
152 | ||
153 | res = nfs4_proc_delegreturn(inode, delegation->cred, &delegation->stateid, issync); | |
154 | nfs_free_delegation(delegation); | |
155 | return res; | |
156 | } | |
157 | ||
86e89489 TM |
158 | static struct inode *nfs_delegation_grab_inode(struct nfs_delegation *delegation) |
159 | { | |
160 | struct inode *inode = NULL; | |
161 | ||
162 | spin_lock(&delegation->lock); | |
163 | if (delegation->inode != NULL) | |
164 | inode = igrab(delegation->inode); | |
165 | spin_unlock(&delegation->lock); | |
166 | return inode; | |
167 | } | |
168 | ||
57bfa891 TM |
169 | static struct nfs_delegation *nfs_detach_delegation_locked(struct nfs_inode *nfsi, const nfs4_stateid *stateid) |
170 | { | |
171 | struct nfs_delegation *delegation = rcu_dereference(nfsi->delegation); | |
172 | ||
173 | if (delegation == NULL) | |
174 | goto nomatch; | |
34310430 | 175 | spin_lock(&delegation->lock); |
57bfa891 TM |
176 | if (stateid != NULL && memcmp(delegation->stateid.data, stateid->data, |
177 | sizeof(delegation->stateid.data)) != 0) | |
34310430 | 178 | goto nomatch_unlock; |
57bfa891 | 179 | list_del_rcu(&delegation->super_list); |
86e89489 | 180 | delegation->inode = NULL; |
57bfa891 TM |
181 | nfsi->delegation_state = 0; |
182 | rcu_assign_pointer(nfsi->delegation, NULL); | |
34310430 | 183 | spin_unlock(&delegation->lock); |
57bfa891 | 184 | return delegation; |
34310430 TM |
185 | nomatch_unlock: |
186 | spin_unlock(&delegation->lock); | |
57bfa891 TM |
187 | nomatch: |
188 | return NULL; | |
189 | } | |
190 | ||
1da177e4 LT |
191 | /* |
192 | * Set up a delegation on an inode | |
193 | */ | |
194 | int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res) | |
195 | { | |
7539bbab | 196 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; |
1da177e4 LT |
197 | struct nfs_inode *nfsi = NFS_I(inode); |
198 | struct nfs_delegation *delegation; | |
57bfa891 | 199 | struct nfs_delegation *freeme = NULL; |
1da177e4 LT |
200 | int status = 0; |
201 | ||
f52720ca | 202 | delegation = kmalloc(sizeof(*delegation), GFP_KERNEL); |
1da177e4 LT |
203 | if (delegation == NULL) |
204 | return -ENOMEM; | |
205 | memcpy(delegation->stateid.data, res->delegation.data, | |
206 | sizeof(delegation->stateid.data)); | |
207 | delegation->type = res->delegation_type; | |
208 | delegation->maxsize = res->maxsize; | |
beb2a5ec | 209 | delegation->change_attr = nfsi->change_attr; |
1da177e4 LT |
210 | delegation->cred = get_rpccred(cred); |
211 | delegation->inode = inode; | |
b7391f44 | 212 | delegation->flags = 1<<NFS_DELEGATION_REFERENCED; |
34310430 | 213 | spin_lock_init(&delegation->lock); |
1da177e4 LT |
214 | |
215 | spin_lock(&clp->cl_lock); | |
57bfa891 | 216 | if (rcu_dereference(nfsi->delegation) != NULL) { |
1da177e4 | 217 | if (memcmp(&delegation->stateid, &nfsi->delegation->stateid, |
57bfa891 TM |
218 | sizeof(delegation->stateid)) == 0 && |
219 | delegation->type == nfsi->delegation->type) { | |
220 | goto out; | |
1da177e4 | 221 | } |
57bfa891 TM |
222 | /* |
223 | * Deal with broken servers that hand out two | |
224 | * delegations for the same file. | |
225 | */ | |
226 | dfprintk(FILE, "%s: server %s handed out " | |
227 | "a duplicate delegation!\n", | |
3110ff80 | 228 | __func__, clp->cl_hostname); |
57bfa891 TM |
229 | if (delegation->type <= nfsi->delegation->type) { |
230 | freeme = delegation; | |
231 | delegation = NULL; | |
232 | goto out; | |
233 | } | |
234 | freeme = nfs_detach_delegation_locked(nfsi, NULL); | |
1da177e4 | 235 | } |
57bfa891 TM |
236 | list_add_rcu(&delegation->super_list, &clp->cl_delegations); |
237 | nfsi->delegation_state = delegation->type; | |
238 | rcu_assign_pointer(nfsi->delegation, delegation); | |
239 | delegation = NULL; | |
412c77ce TM |
240 | |
241 | /* Ensure we revalidate the attributes and page cache! */ | |
242 | spin_lock(&inode->i_lock); | |
243 | nfsi->cache_validity |= NFS_INO_REVAL_FORCED; | |
244 | spin_unlock(&inode->i_lock); | |
245 | ||
57bfa891 | 246 | out: |
1da177e4 | 247 | spin_unlock(&clp->cl_lock); |
603c83da TM |
248 | if (delegation != NULL) |
249 | nfs_free_delegation(delegation); | |
57bfa891 TM |
250 | if (freeme != NULL) |
251 | nfs_do_return_delegation(inode, freeme, 0); | |
1da177e4 LT |
252 | return status; |
253 | } | |
254 | ||
1da177e4 LT |
255 | /* Sync all data to disk upon delegation return */ |
256 | static void nfs_msync_inode(struct inode *inode) | |
257 | { | |
258 | filemap_fdatawrite(inode->i_mapping); | |
259 | nfs_wb_all(inode); | |
260 | filemap_fdatawait(inode->i_mapping); | |
261 | } | |
262 | ||
263 | /* | |
264 | * Basic procedure for returning a delegation to the server | |
265 | */ | |
90163027 | 266 | static int __nfs_inode_return_delegation(struct inode *inode, struct nfs_delegation *delegation) |
1da177e4 | 267 | { |
1da177e4 | 268 | struct nfs_inode *nfsi = NFS_I(inode); |
1da177e4 LT |
269 | |
270 | nfs_msync_inode(inode); | |
1da177e4 LT |
271 | /* Guard against new delegated open calls */ |
272 | down_write(&nfsi->rwsem); | |
90163027 | 273 | nfs_delegation_claim_opens(inode, &delegation->stateid); |
1da177e4 | 274 | up_write(&nfsi->rwsem); |
1da177e4 LT |
275 | nfs_msync_inode(inode); |
276 | ||
e6f81075 | 277 | return nfs_do_return_delegation(inode, delegation, 1); |
90163027 TM |
278 | } |
279 | ||
515d8611 TM |
280 | /* |
281 | * Return all delegations that have been marked for return | |
282 | */ | |
707fb4b3 | 283 | void nfs_client_return_marked_delegations(struct nfs_client *clp) |
515d8611 TM |
284 | { |
285 | struct nfs_delegation *delegation; | |
286 | struct inode *inode; | |
287 | ||
288 | restart: | |
289 | rcu_read_lock(); | |
290 | list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) { | |
291 | if (!test_and_clear_bit(NFS_DELEGATION_RETURN, &delegation->flags)) | |
292 | continue; | |
293 | inode = nfs_delegation_grab_inode(delegation); | |
294 | if (inode == NULL) | |
295 | continue; | |
296 | spin_lock(&clp->cl_lock); | |
297 | delegation = nfs_detach_delegation_locked(NFS_I(inode), NULL); | |
298 | spin_unlock(&clp->cl_lock); | |
299 | rcu_read_unlock(); | |
300 | if (delegation != NULL) | |
301 | __nfs_inode_return_delegation(inode, delegation); | |
302 | iput(inode); | |
303 | goto restart; | |
304 | } | |
305 | rcu_read_unlock(); | |
306 | } | |
307 | ||
e6f81075 TM |
308 | /* |
309 | * This function returns the delegation without reclaiming opens | |
310 | * or protecting against delegation reclaims. | |
311 | * It is therefore really only safe to be called from | |
312 | * nfs4_clear_inode() | |
313 | */ | |
314 | void nfs_inode_return_delegation_noreclaim(struct inode *inode) | |
315 | { | |
316 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; | |
317 | struct nfs_inode *nfsi = NFS_I(inode); | |
318 | struct nfs_delegation *delegation; | |
319 | ||
320 | if (rcu_dereference(nfsi->delegation) != NULL) { | |
321 | spin_lock(&clp->cl_lock); | |
322 | delegation = nfs_detach_delegation_locked(nfsi, NULL); | |
323 | spin_unlock(&clp->cl_lock); | |
324 | if (delegation != NULL) | |
325 | nfs_do_return_delegation(inode, delegation, 0); | |
326 | } | |
327 | } | |
328 | ||
90163027 TM |
329 | int nfs_inode_return_delegation(struct inode *inode) |
330 | { | |
331 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; | |
332 | struct nfs_inode *nfsi = NFS_I(inode); | |
333 | struct nfs_delegation *delegation; | |
334 | int err = 0; | |
335 | ||
8383e460 | 336 | if (rcu_dereference(nfsi->delegation) != NULL) { |
90163027 TM |
337 | spin_lock(&clp->cl_lock); |
338 | delegation = nfs_detach_delegation_locked(nfsi, NULL); | |
339 | spin_unlock(&clp->cl_lock); | |
340 | if (delegation != NULL) | |
341 | err = __nfs_inode_return_delegation(inode, delegation); | |
342 | } | |
343 | return err; | |
1da177e4 LT |
344 | } |
345 | ||
6411bd4a TM |
346 | static void nfs_mark_return_delegation(struct nfs_client *clp, struct nfs_delegation *delegation) |
347 | { | |
348 | set_bit(NFS_DELEGATION_RETURN, &delegation->flags); | |
349 | set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state); | |
350 | } | |
351 | ||
1da177e4 LT |
352 | /* |
353 | * Return all delegations associated to a super block | |
354 | */ | |
515d8611 | 355 | void nfs_super_return_all_delegations(struct super_block *sb) |
1da177e4 | 356 | { |
7539bbab | 357 | struct nfs_client *clp = NFS_SB(sb)->nfs_client; |
1da177e4 | 358 | struct nfs_delegation *delegation; |
1da177e4 LT |
359 | |
360 | if (clp == NULL) | |
361 | return; | |
8383e460 TM |
362 | rcu_read_lock(); |
363 | list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) { | |
86e89489 TM |
364 | spin_lock(&delegation->lock); |
365 | if (delegation->inode != NULL && delegation->inode->i_sb == sb) | |
515d8611 | 366 | set_bit(NFS_DELEGATION_RETURN, &delegation->flags); |
86e89489 | 367 | spin_unlock(&delegation->lock); |
1da177e4 | 368 | } |
8383e460 | 369 | rcu_read_unlock(); |
515d8611 TM |
370 | nfs_client_return_marked_delegations(clp); |
371 | } | |
372 | ||
707fb4b3 | 373 | static void nfs_client_mark_return_all_delegations(struct nfs_client *clp) |
515d8611 TM |
374 | { |
375 | struct nfs_delegation *delegation; | |
376 | ||
377 | rcu_read_lock(); | |
707fb4b3 | 378 | list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) { |
515d8611 | 379 | set_bit(NFS_DELEGATION_RETURN, &delegation->flags); |
707fb4b3 TM |
380 | set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state); |
381 | } | |
515d8611 | 382 | rcu_read_unlock(); |
1da177e4 LT |
383 | } |
384 | ||
b0d3ded1 | 385 | static void nfs_delegation_run_state_manager(struct nfs_client *clp) |
58d9714a | 386 | { |
b0d3ded1 TM |
387 | if (test_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) |
388 | nfs4_schedule_state_manager(clp); | |
58d9714a TM |
389 | } |
390 | ||
adfa6f98 | 391 | void nfs_expire_all_delegations(struct nfs_client *clp) |
58d9714a | 392 | { |
b0d3ded1 TM |
393 | nfs_client_mark_return_all_delegations(clp); |
394 | nfs_delegation_run_state_manager(clp); | |
58d9714a TM |
395 | } |
396 | ||
1da177e4 LT |
397 | /* |
398 | * Return all delegations following an NFS4ERR_CB_PATH_DOWN error. | |
399 | */ | |
adfa6f98 | 400 | void nfs_handle_cb_pathdown(struct nfs_client *clp) |
1da177e4 | 401 | { |
1da177e4 LT |
402 | if (clp == NULL) |
403 | return; | |
707fb4b3 | 404 | nfs_client_mark_return_all_delegations(clp); |
1da177e4 LT |
405 | } |
406 | ||
b7391f44 TM |
407 | static void nfs_client_mark_return_unreferenced_delegations(struct nfs_client *clp) |
408 | { | |
409 | struct nfs_delegation *delegation; | |
410 | ||
411 | rcu_read_lock(); | |
412 | list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) { | |
413 | if (test_and_clear_bit(NFS_DELEGATION_REFERENCED, &delegation->flags)) | |
414 | continue; | |
415 | set_bit(NFS_DELEGATION_RETURN, &delegation->flags); | |
416 | set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state); | |
417 | } | |
418 | rcu_read_unlock(); | |
419 | } | |
420 | ||
421 | void nfs_expire_unreferenced_delegations(struct nfs_client *clp) | |
422 | { | |
423 | nfs_client_mark_return_unreferenced_delegations(clp); | |
424 | nfs_delegation_run_state_manager(clp); | |
425 | } | |
426 | ||
1da177e4 LT |
427 | /* |
428 | * Asynchronous delegation recall! | |
429 | */ | |
430 | int nfs_async_inode_return_delegation(struct inode *inode, const nfs4_stateid *stateid) | |
431 | { | |
6411bd4a TM |
432 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; |
433 | struct nfs_delegation *delegation; | |
1da177e4 | 434 | |
6411bd4a TM |
435 | rcu_read_lock(); |
436 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
437 | if (delegation == NULL || memcmp(delegation->stateid.data, stateid->data, | |
438 | sizeof(delegation->stateid.data)) != 0) { | |
439 | rcu_read_unlock(); | |
440 | return -ENOENT; | |
441 | } | |
442 | nfs_mark_return_delegation(clp, delegation); | |
443 | rcu_read_unlock(); | |
444 | nfs_delegation_run_state_manager(clp); | |
445 | return 0; | |
1da177e4 LT |
446 | } |
447 | ||
448 | /* | |
449 | * Retrieve the inode associated with a delegation | |
450 | */ | |
adfa6f98 | 451 | struct inode *nfs_delegation_find_inode(struct nfs_client *clp, const struct nfs_fh *fhandle) |
1da177e4 LT |
452 | { |
453 | struct nfs_delegation *delegation; | |
454 | struct inode *res = NULL; | |
8383e460 TM |
455 | rcu_read_lock(); |
456 | list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) { | |
86e89489 TM |
457 | spin_lock(&delegation->lock); |
458 | if (delegation->inode != NULL && | |
459 | nfs_compare_fh(fhandle, &NFS_I(delegation->inode)->fh) == 0) { | |
1da177e4 | 460 | res = igrab(delegation->inode); |
1da177e4 | 461 | } |
86e89489 TM |
462 | spin_unlock(&delegation->lock); |
463 | if (res != NULL) | |
464 | break; | |
1da177e4 | 465 | } |
8383e460 | 466 | rcu_read_unlock(); |
1da177e4 LT |
467 | return res; |
468 | } | |
469 | ||
470 | /* | |
471 | * Mark all delegations as needing to be reclaimed | |
472 | */ | |
adfa6f98 | 473 | void nfs_delegation_mark_reclaim(struct nfs_client *clp) |
1da177e4 LT |
474 | { |
475 | struct nfs_delegation *delegation; | |
8383e460 TM |
476 | rcu_read_lock(); |
477 | list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) | |
15c831bf | 478 | set_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags); |
8383e460 | 479 | rcu_read_unlock(); |
1da177e4 LT |
480 | } |
481 | ||
482 | /* | |
483 | * Reap all unclaimed delegations after reboot recovery is done | |
484 | */ | |
adfa6f98 | 485 | void nfs_delegation_reap_unclaimed(struct nfs_client *clp) |
1da177e4 | 486 | { |
8383e460 | 487 | struct nfs_delegation *delegation; |
86e89489 | 488 | struct inode *inode; |
8383e460 TM |
489 | restart: |
490 | rcu_read_lock(); | |
491 | list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) { | |
15c831bf | 492 | if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) |
1da177e4 | 493 | continue; |
86e89489 TM |
494 | inode = nfs_delegation_grab_inode(delegation); |
495 | if (inode == NULL) | |
496 | continue; | |
8383e460 | 497 | spin_lock(&clp->cl_lock); |
86e89489 | 498 | delegation = nfs_detach_delegation_locked(NFS_I(inode), NULL); |
8383e460 TM |
499 | spin_unlock(&clp->cl_lock); |
500 | rcu_read_unlock(); | |
501 | if (delegation != NULL) | |
905f8d16 | 502 | nfs_free_delegation(delegation); |
86e89489 | 503 | iput(inode); |
8383e460 | 504 | goto restart; |
1da177e4 | 505 | } |
8383e460 | 506 | rcu_read_unlock(); |
1da177e4 | 507 | } |
3e4f6290 TM |
508 | |
509 | int nfs4_copy_delegation_stateid(nfs4_stateid *dst, struct inode *inode) | |
510 | { | |
3e4f6290 TM |
511 | struct nfs_inode *nfsi = NFS_I(inode); |
512 | struct nfs_delegation *delegation; | |
8383e460 | 513 | int ret = 0; |
3e4f6290 | 514 | |
8383e460 TM |
515 | rcu_read_lock(); |
516 | delegation = rcu_dereference(nfsi->delegation); | |
3e4f6290 TM |
517 | if (delegation != NULL) { |
518 | memcpy(dst->data, delegation->stateid.data, sizeof(dst->data)); | |
8383e460 | 519 | ret = 1; |
3e4f6290 | 520 | } |
8383e460 TM |
521 | rcu_read_unlock(); |
522 | return ret; | |
3e4f6290 | 523 | } |