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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> |
405f5571 | 14 | #include <linux/smp_lock.h> |
1da177e4 LT |
15 | #include <linux/spinlock.h> |
16 | ||
17 | #include <linux/nfs4.h> | |
18 | #include <linux/nfs_fs.h> | |
19 | #include <linux/nfs_xdr.h> | |
20 | ||
4ce79717 | 21 | #include "nfs4_fs.h" |
1da177e4 | 22 | #include "delegation.h" |
24c8dbbb | 23 | #include "internal.h" |
1da177e4 | 24 | |
905f8d16 | 25 | static void nfs_do_free_delegation(struct nfs_delegation *delegation) |
1da177e4 | 26 | { |
1da177e4 LT |
27 | kfree(delegation); |
28 | } | |
29 | ||
8383e460 TM |
30 | static void nfs_free_delegation_callback(struct rcu_head *head) |
31 | { | |
32 | struct nfs_delegation *delegation = container_of(head, struct nfs_delegation, rcu); | |
33 | ||
905f8d16 TM |
34 | nfs_do_free_delegation(delegation); |
35 | } | |
36 | ||
37 | static void nfs_free_delegation(struct nfs_delegation *delegation) | |
38 | { | |
39 | struct rpc_cred *cred; | |
40 | ||
41 | cred = rcu_dereference(delegation->cred); | |
42 | rcu_assign_pointer(delegation->cred, NULL); | |
43 | call_rcu(&delegation->rcu, nfs_free_delegation_callback); | |
44 | if (cred) | |
45 | put_rpccred(cred); | |
8383e460 TM |
46 | } |
47 | ||
b7391f44 TM |
48 | void nfs_mark_delegation_referenced(struct nfs_delegation *delegation) |
49 | { | |
50 | set_bit(NFS_DELEGATION_REFERENCED, &delegation->flags); | |
51 | } | |
52 | ||
bd7bf9d5 | 53 | int nfs_have_delegation(struct inode *inode, fmode_t flags) |
b7391f44 TM |
54 | { |
55 | struct nfs_delegation *delegation; | |
56 | int ret = 0; | |
57 | ||
58 | flags &= FMODE_READ|FMODE_WRITE; | |
59 | rcu_read_lock(); | |
60 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
61 | if (delegation != NULL && (delegation->type & flags) == flags) { | |
62 | nfs_mark_delegation_referenced(delegation); | |
63 | ret = 1; | |
64 | } | |
65 | rcu_read_unlock(); | |
66 | return ret; | |
67 | } | |
68 | ||
888e694c TM |
69 | static int nfs_delegation_claim_locks(struct nfs_open_context *ctx, struct nfs4_state *state) |
70 | { | |
71 | struct inode *inode = state->inode; | |
72 | struct file_lock *fl; | |
d5122201 | 73 | int status = 0; |
888e694c | 74 | |
3f09df70 TM |
75 | if (inode->i_flock == NULL) |
76 | goto out; | |
77 | ||
78 | /* Protect inode->i_flock using the BKL */ | |
79 | lock_kernel(); | |
90dc7d27 | 80 | for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) { |
888e694c TM |
81 | if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK))) |
82 | continue; | |
cd3758e3 | 83 | if (nfs_file_open_context(fl->fl_file) != ctx) |
888e694c | 84 | continue; |
3f09df70 | 85 | unlock_kernel(); |
888e694c | 86 | status = nfs4_lock_delegation_recall(state, fl); |
d5122201 | 87 | if (status < 0) |
3f09df70 TM |
88 | goto out; |
89 | lock_kernel(); | |
888e694c | 90 | } |
3f09df70 TM |
91 | unlock_kernel(); |
92 | out: | |
888e694c TM |
93 | return status; |
94 | } | |
95 | ||
d18cc1fd | 96 | static int nfs_delegation_claim_opens(struct inode *inode, const nfs4_stateid *stateid) |
1da177e4 LT |
97 | { |
98 | struct nfs_inode *nfsi = NFS_I(inode); | |
99 | struct nfs_open_context *ctx; | |
100 | struct nfs4_state *state; | |
888e694c | 101 | int err; |
1da177e4 LT |
102 | |
103 | again: | |
104 | spin_lock(&inode->i_lock); | |
105 | list_for_each_entry(ctx, &nfsi->open_files, list) { | |
106 | state = ctx->state; | |
107 | if (state == NULL) | |
108 | continue; | |
109 | if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) | |
110 | continue; | |
90163027 TM |
111 | if (memcmp(state->stateid.data, stateid->data, sizeof(state->stateid.data)) != 0) |
112 | continue; | |
1da177e4 LT |
113 | get_nfs_open_context(ctx); |
114 | spin_unlock(&inode->i_lock); | |
13437e12 | 115 | err = nfs4_open_delegation_recall(ctx, state, stateid); |
888e694c TM |
116 | if (err >= 0) |
117 | err = nfs_delegation_claim_locks(ctx, state); | |
1da177e4 | 118 | put_nfs_open_context(ctx); |
888e694c | 119 | if (err != 0) |
d18cc1fd | 120 | return err; |
1da177e4 LT |
121 | goto again; |
122 | } | |
123 | spin_unlock(&inode->i_lock); | |
d18cc1fd | 124 | return 0; |
1da177e4 LT |
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 | */ | |
d18cc1fd | 266 | static int __nfs_inode_return_delegation(struct inode *inode, struct nfs_delegation *delegation, int issync) |
1da177e4 | 267 | { |
1da177e4 | 268 | struct nfs_inode *nfsi = NFS_I(inode); |
d18cc1fd | 269 | int err; |
1da177e4 | 270 | |
3f09df70 TM |
271 | /* |
272 | * Guard against new delegated open/lock/unlock calls and against | |
273 | * state recovery | |
274 | */ | |
1da177e4 | 275 | down_write(&nfsi->rwsem); |
d18cc1fd | 276 | err = nfs_delegation_claim_opens(inode, &delegation->stateid); |
1da177e4 | 277 | up_write(&nfsi->rwsem); |
d18cc1fd TM |
278 | if (err) |
279 | goto out; | |
1da177e4 | 280 | |
d18cc1fd TM |
281 | err = nfs_do_return_delegation(inode, delegation, issync); |
282 | out: | |
283 | return err; | |
90163027 TM |
284 | } |
285 | ||
515d8611 TM |
286 | /* |
287 | * Return all delegations that have been marked for return | |
288 | */ | |
d18cc1fd | 289 | int nfs_client_return_marked_delegations(struct nfs_client *clp) |
515d8611 TM |
290 | { |
291 | struct nfs_delegation *delegation; | |
292 | struct inode *inode; | |
d18cc1fd | 293 | int err = 0; |
515d8611 TM |
294 | |
295 | restart: | |
296 | rcu_read_lock(); | |
297 | list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) { | |
298 | if (!test_and_clear_bit(NFS_DELEGATION_RETURN, &delegation->flags)) | |
299 | continue; | |
300 | inode = nfs_delegation_grab_inode(delegation); | |
301 | if (inode == NULL) | |
302 | continue; | |
303 | spin_lock(&clp->cl_lock); | |
304 | delegation = nfs_detach_delegation_locked(NFS_I(inode), NULL); | |
305 | spin_unlock(&clp->cl_lock); | |
306 | rcu_read_unlock(); | |
d18cc1fd TM |
307 | if (delegation != NULL) { |
308 | filemap_flush(inode->i_mapping); | |
309 | err = __nfs_inode_return_delegation(inode, delegation, 0); | |
310 | } | |
515d8611 | 311 | iput(inode); |
d18cc1fd TM |
312 | if (!err) |
313 | goto restart; | |
314 | set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state); | |
315 | return err; | |
515d8611 TM |
316 | } |
317 | rcu_read_unlock(); | |
d18cc1fd | 318 | return 0; |
515d8611 TM |
319 | } |
320 | ||
e6f81075 TM |
321 | /* |
322 | * This function returns the delegation without reclaiming opens | |
323 | * or protecting against delegation reclaims. | |
324 | * It is therefore really only safe to be called from | |
325 | * nfs4_clear_inode() | |
326 | */ | |
327 | void nfs_inode_return_delegation_noreclaim(struct inode *inode) | |
328 | { | |
329 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; | |
330 | struct nfs_inode *nfsi = NFS_I(inode); | |
331 | struct nfs_delegation *delegation; | |
332 | ||
333 | if (rcu_dereference(nfsi->delegation) != NULL) { | |
334 | spin_lock(&clp->cl_lock); | |
335 | delegation = nfs_detach_delegation_locked(nfsi, NULL); | |
336 | spin_unlock(&clp->cl_lock); | |
337 | if (delegation != NULL) | |
338 | nfs_do_return_delegation(inode, delegation, 0); | |
339 | } | |
340 | } | |
341 | ||
90163027 TM |
342 | int nfs_inode_return_delegation(struct inode *inode) |
343 | { | |
344 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; | |
345 | struct nfs_inode *nfsi = NFS_I(inode); | |
346 | struct nfs_delegation *delegation; | |
347 | int err = 0; | |
348 | ||
8383e460 | 349 | if (rcu_dereference(nfsi->delegation) != NULL) { |
90163027 TM |
350 | spin_lock(&clp->cl_lock); |
351 | delegation = nfs_detach_delegation_locked(nfsi, NULL); | |
352 | spin_unlock(&clp->cl_lock); | |
d18cc1fd TM |
353 | if (delegation != NULL) { |
354 | nfs_msync_inode(inode); | |
355 | err = __nfs_inode_return_delegation(inode, delegation, 1); | |
356 | } | |
90163027 TM |
357 | } |
358 | return err; | |
1da177e4 LT |
359 | } |
360 | ||
6411bd4a TM |
361 | static void nfs_mark_return_delegation(struct nfs_client *clp, struct nfs_delegation *delegation) |
362 | { | |
363 | set_bit(NFS_DELEGATION_RETURN, &delegation->flags); | |
364 | set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state); | |
365 | } | |
366 | ||
1da177e4 LT |
367 | /* |
368 | * Return all delegations associated to a super block | |
369 | */ | |
515d8611 | 370 | void nfs_super_return_all_delegations(struct super_block *sb) |
1da177e4 | 371 | { |
7539bbab | 372 | struct nfs_client *clp = NFS_SB(sb)->nfs_client; |
1da177e4 | 373 | struct nfs_delegation *delegation; |
1da177e4 LT |
374 | |
375 | if (clp == NULL) | |
376 | return; | |
8383e460 TM |
377 | rcu_read_lock(); |
378 | list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) { | |
86e89489 TM |
379 | spin_lock(&delegation->lock); |
380 | if (delegation->inode != NULL && delegation->inode->i_sb == sb) | |
515d8611 | 381 | set_bit(NFS_DELEGATION_RETURN, &delegation->flags); |
86e89489 | 382 | spin_unlock(&delegation->lock); |
1da177e4 | 383 | } |
8383e460 | 384 | rcu_read_unlock(); |
d18cc1fd TM |
385 | if (nfs_client_return_marked_delegations(clp) != 0) |
386 | nfs4_schedule_state_manager(clp); | |
515d8611 TM |
387 | } |
388 | ||
c79571a5 AB |
389 | static |
390 | void nfs_client_mark_return_all_delegation_types(struct nfs_client *clp, fmode_t flags) | |
515d8611 TM |
391 | { |
392 | struct nfs_delegation *delegation; | |
393 | ||
394 | rcu_read_lock(); | |
707fb4b3 | 395 | list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) { |
c79571a5 AB |
396 | if ((delegation->type == (FMODE_READ|FMODE_WRITE)) && !(flags & FMODE_WRITE)) |
397 | continue; | |
398 | if (delegation->type & flags) | |
399 | nfs_mark_return_delegation(clp, delegation); | |
707fb4b3 | 400 | } |
515d8611 | 401 | rcu_read_unlock(); |
1da177e4 LT |
402 | } |
403 | ||
c79571a5 AB |
404 | static void nfs_client_mark_return_all_delegations(struct nfs_client *clp) |
405 | { | |
406 | nfs_client_mark_return_all_delegation_types(clp, FMODE_READ|FMODE_WRITE); | |
407 | } | |
408 | ||
b0d3ded1 | 409 | static void nfs_delegation_run_state_manager(struct nfs_client *clp) |
58d9714a | 410 | { |
b0d3ded1 TM |
411 | if (test_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) |
412 | nfs4_schedule_state_manager(clp); | |
58d9714a TM |
413 | } |
414 | ||
31f09607 | 415 | void nfs_expire_all_delegation_types(struct nfs_client *clp, fmode_t flags) |
58d9714a | 416 | { |
c79571a5 | 417 | nfs_client_mark_return_all_delegation_types(clp, flags); |
b0d3ded1 | 418 | nfs_delegation_run_state_manager(clp); |
58d9714a TM |
419 | } |
420 | ||
c79571a5 AB |
421 | void nfs_expire_all_delegations(struct nfs_client *clp) |
422 | { | |
423 | nfs_expire_all_delegation_types(clp, FMODE_READ|FMODE_WRITE); | |
424 | } | |
425 | ||
1da177e4 LT |
426 | /* |
427 | * Return all delegations following an NFS4ERR_CB_PATH_DOWN error. | |
428 | */ | |
adfa6f98 | 429 | void nfs_handle_cb_pathdown(struct nfs_client *clp) |
1da177e4 | 430 | { |
1da177e4 LT |
431 | if (clp == NULL) |
432 | return; | |
707fb4b3 | 433 | nfs_client_mark_return_all_delegations(clp); |
1da177e4 LT |
434 | } |
435 | ||
b7391f44 TM |
436 | static void nfs_client_mark_return_unreferenced_delegations(struct nfs_client *clp) |
437 | { | |
438 | struct nfs_delegation *delegation; | |
439 | ||
440 | rcu_read_lock(); | |
441 | list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) { | |
442 | if (test_and_clear_bit(NFS_DELEGATION_REFERENCED, &delegation->flags)) | |
443 | continue; | |
b4a6f496 | 444 | nfs_mark_return_delegation(clp, delegation); |
b7391f44 TM |
445 | } |
446 | rcu_read_unlock(); | |
447 | } | |
448 | ||
449 | void nfs_expire_unreferenced_delegations(struct nfs_client *clp) | |
450 | { | |
451 | nfs_client_mark_return_unreferenced_delegations(clp); | |
452 | nfs_delegation_run_state_manager(clp); | |
453 | } | |
454 | ||
1da177e4 LT |
455 | /* |
456 | * Asynchronous delegation recall! | |
457 | */ | |
2597641d AB |
458 | int nfs_async_inode_return_delegation(struct inode *inode, const nfs4_stateid *stateid, |
459 | int (*validate_stateid)(struct nfs_delegation *delegation, | |
460 | const nfs4_stateid *stateid)) | |
1da177e4 | 461 | { |
6411bd4a TM |
462 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; |
463 | struct nfs_delegation *delegation; | |
1da177e4 | 464 | |
6411bd4a TM |
465 | rcu_read_lock(); |
466 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
2597641d AB |
467 | |
468 | if (!validate_stateid(delegation, stateid)) { | |
6411bd4a TM |
469 | rcu_read_unlock(); |
470 | return -ENOENT; | |
471 | } | |
2597641d | 472 | |
6411bd4a TM |
473 | nfs_mark_return_delegation(clp, delegation); |
474 | rcu_read_unlock(); | |
475 | nfs_delegation_run_state_manager(clp); | |
476 | return 0; | |
1da177e4 LT |
477 | } |
478 | ||
479 | /* | |
480 | * Retrieve the inode associated with a delegation | |
481 | */ | |
adfa6f98 | 482 | struct inode *nfs_delegation_find_inode(struct nfs_client *clp, const struct nfs_fh *fhandle) |
1da177e4 LT |
483 | { |
484 | struct nfs_delegation *delegation; | |
485 | struct inode *res = NULL; | |
8383e460 TM |
486 | rcu_read_lock(); |
487 | list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) { | |
86e89489 TM |
488 | spin_lock(&delegation->lock); |
489 | if (delegation->inode != NULL && | |
490 | nfs_compare_fh(fhandle, &NFS_I(delegation->inode)->fh) == 0) { | |
1da177e4 | 491 | res = igrab(delegation->inode); |
1da177e4 | 492 | } |
86e89489 TM |
493 | spin_unlock(&delegation->lock); |
494 | if (res != NULL) | |
495 | break; | |
1da177e4 | 496 | } |
8383e460 | 497 | rcu_read_unlock(); |
1da177e4 LT |
498 | return res; |
499 | } | |
500 | ||
501 | /* | |
502 | * Mark all delegations as needing to be reclaimed | |
503 | */ | |
adfa6f98 | 504 | void nfs_delegation_mark_reclaim(struct nfs_client *clp) |
1da177e4 LT |
505 | { |
506 | struct nfs_delegation *delegation; | |
8383e460 TM |
507 | rcu_read_lock(); |
508 | list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) | |
15c831bf | 509 | set_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags); |
8383e460 | 510 | rcu_read_unlock(); |
1da177e4 LT |
511 | } |
512 | ||
513 | /* | |
514 | * Reap all unclaimed delegations after reboot recovery is done | |
515 | */ | |
adfa6f98 | 516 | void nfs_delegation_reap_unclaimed(struct nfs_client *clp) |
1da177e4 | 517 | { |
8383e460 | 518 | struct nfs_delegation *delegation; |
86e89489 | 519 | struct inode *inode; |
8383e460 TM |
520 | restart: |
521 | rcu_read_lock(); | |
522 | list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) { | |
15c831bf | 523 | if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) |
1da177e4 | 524 | continue; |
86e89489 TM |
525 | inode = nfs_delegation_grab_inode(delegation); |
526 | if (inode == NULL) | |
527 | continue; | |
8383e460 | 528 | spin_lock(&clp->cl_lock); |
86e89489 | 529 | delegation = nfs_detach_delegation_locked(NFS_I(inode), NULL); |
8383e460 TM |
530 | spin_unlock(&clp->cl_lock); |
531 | rcu_read_unlock(); | |
532 | if (delegation != NULL) | |
905f8d16 | 533 | nfs_free_delegation(delegation); |
86e89489 | 534 | iput(inode); |
8383e460 | 535 | goto restart; |
1da177e4 | 536 | } |
8383e460 | 537 | rcu_read_unlock(); |
1da177e4 | 538 | } |
3e4f6290 TM |
539 | |
540 | int nfs4_copy_delegation_stateid(nfs4_stateid *dst, struct inode *inode) | |
541 | { | |
3e4f6290 TM |
542 | struct nfs_inode *nfsi = NFS_I(inode); |
543 | struct nfs_delegation *delegation; | |
8383e460 | 544 | int ret = 0; |
3e4f6290 | 545 | |
8383e460 TM |
546 | rcu_read_lock(); |
547 | delegation = rcu_dereference(nfsi->delegation); | |
3e4f6290 TM |
548 | if (delegation != NULL) { |
549 | memcpy(dst->data, delegation->stateid.data, sizeof(dst->data)); | |
8383e460 | 550 | ret = 1; |
3e4f6290 | 551 | } |
8383e460 TM |
552 | rcu_read_unlock(); |
553 | return ret; | |
3e4f6290 | 554 | } |