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> | |
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 | { |
17d2c0a0 DH |
27 | if (delegation->cred) |
28 | put_rpccred(delegation->cred); | |
1da177e4 LT |
29 | kfree(delegation); |
30 | } | |
31 | ||
8383e460 TM |
32 | static void nfs_free_delegation_callback(struct rcu_head *head) |
33 | { | |
34 | struct nfs_delegation *delegation = container_of(head, struct nfs_delegation, rcu); | |
35 | ||
905f8d16 TM |
36 | nfs_do_free_delegation(delegation); |
37 | } | |
38 | ||
39 | static void nfs_free_delegation(struct nfs_delegation *delegation) | |
40 | { | |
905f8d16 | 41 | call_rcu(&delegation->rcu, nfs_free_delegation_callback); |
8383e460 TM |
42 | } |
43 | ||
b7391f44 TM |
44 | void nfs_mark_delegation_referenced(struct nfs_delegation *delegation) |
45 | { | |
46 | set_bit(NFS_DELEGATION_REFERENCED, &delegation->flags); | |
47 | } | |
48 | ||
bd7bf9d5 | 49 | int nfs_have_delegation(struct inode *inode, fmode_t flags) |
b7391f44 TM |
50 | { |
51 | struct nfs_delegation *delegation; | |
52 | int ret = 0; | |
53 | ||
54 | flags &= FMODE_READ|FMODE_WRITE; | |
55 | rcu_read_lock(); | |
56 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
57 | if (delegation != NULL && (delegation->type & flags) == flags) { | |
58 | nfs_mark_delegation_referenced(delegation); | |
59 | ret = 1; | |
60 | } | |
61 | rcu_read_unlock(); | |
62 | return ret; | |
63 | } | |
64 | ||
888e694c TM |
65 | static int nfs_delegation_claim_locks(struct nfs_open_context *ctx, struct nfs4_state *state) |
66 | { | |
67 | struct inode *inode = state->inode; | |
68 | struct file_lock *fl; | |
d5122201 | 69 | int status = 0; |
888e694c | 70 | |
3f09df70 TM |
71 | if (inode->i_flock == NULL) |
72 | goto out; | |
73 | ||
b89f4321 AB |
74 | /* Protect inode->i_flock using the file locks lock */ |
75 | lock_flocks(); | |
90dc7d27 | 76 | for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) { |
888e694c TM |
77 | if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK))) |
78 | continue; | |
cd3758e3 | 79 | if (nfs_file_open_context(fl->fl_file) != ctx) |
888e694c | 80 | continue; |
b89f4321 | 81 | unlock_flocks(); |
888e694c | 82 | status = nfs4_lock_delegation_recall(state, fl); |
d5122201 | 83 | if (status < 0) |
3f09df70 | 84 | goto out; |
b89f4321 | 85 | lock_flocks(); |
888e694c | 86 | } |
b89f4321 | 87 | unlock_flocks(); |
3f09df70 | 88 | out: |
888e694c TM |
89 | return status; |
90 | } | |
91 | ||
d18cc1fd | 92 | static int nfs_delegation_claim_opens(struct inode *inode, const nfs4_stateid *stateid) |
1da177e4 LT |
93 | { |
94 | struct nfs_inode *nfsi = NFS_I(inode); | |
95 | struct nfs_open_context *ctx; | |
96 | struct nfs4_state *state; | |
888e694c | 97 | int err; |
1da177e4 LT |
98 | |
99 | again: | |
100 | spin_lock(&inode->i_lock); | |
101 | list_for_each_entry(ctx, &nfsi->open_files, list) { | |
102 | state = ctx->state; | |
103 | if (state == NULL) | |
104 | continue; | |
105 | if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) | |
106 | continue; | |
90163027 TM |
107 | if (memcmp(state->stateid.data, stateid->data, sizeof(state->stateid.data)) != 0) |
108 | continue; | |
1da177e4 LT |
109 | get_nfs_open_context(ctx); |
110 | spin_unlock(&inode->i_lock); | |
13437e12 | 111 | err = nfs4_open_delegation_recall(ctx, state, stateid); |
888e694c TM |
112 | if (err >= 0) |
113 | err = nfs_delegation_claim_locks(ctx, state); | |
1da177e4 | 114 | put_nfs_open_context(ctx); |
888e694c | 115 | if (err != 0) |
d18cc1fd | 116 | return err; |
1da177e4 LT |
117 | goto again; |
118 | } | |
119 | spin_unlock(&inode->i_lock); | |
d18cc1fd | 120 | return 0; |
1da177e4 LT |
121 | } |
122 | ||
123 | /* | |
124 | * Set up a delegation on an inode | |
125 | */ | |
126 | void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res) | |
127 | { | |
8f649c37 TM |
128 | struct nfs_delegation *delegation; |
129 | struct rpc_cred *oldcred = NULL; | |
1da177e4 | 130 | |
8f649c37 TM |
131 | rcu_read_lock(); |
132 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
133 | if (delegation != NULL) { | |
134 | spin_lock(&delegation->lock); | |
135 | if (delegation->inode != NULL) { | |
136 | memcpy(delegation->stateid.data, res->delegation.data, | |
137 | sizeof(delegation->stateid.data)); | |
138 | delegation->type = res->delegation_type; | |
139 | delegation->maxsize = res->maxsize; | |
140 | oldcred = delegation->cred; | |
141 | delegation->cred = get_rpccred(cred); | |
142 | clear_bit(NFS_DELEGATION_NEED_RECLAIM, | |
143 | &delegation->flags); | |
144 | NFS_I(inode)->delegation_state = delegation->type; | |
145 | spin_unlock(&delegation->lock); | |
146 | put_rpccred(oldcred); | |
147 | rcu_read_unlock(); | |
148 | } else { | |
149 | /* We appear to have raced with a delegation return. */ | |
150 | spin_unlock(&delegation->lock); | |
151 | rcu_read_unlock(); | |
152 | nfs_inode_set_delegation(inode, cred, res); | |
153 | } | |
154 | } else { | |
155 | rcu_read_unlock(); | |
156 | } | |
1da177e4 LT |
157 | } |
158 | ||
57bfa891 TM |
159 | static int nfs_do_return_delegation(struct inode *inode, struct nfs_delegation *delegation, int issync) |
160 | { | |
161 | int res = 0; | |
162 | ||
163 | res = nfs4_proc_delegreturn(inode, delegation->cred, &delegation->stateid, issync); | |
164 | nfs_free_delegation(delegation); | |
165 | return res; | |
166 | } | |
167 | ||
86e89489 TM |
168 | static struct inode *nfs_delegation_grab_inode(struct nfs_delegation *delegation) |
169 | { | |
170 | struct inode *inode = NULL; | |
171 | ||
172 | spin_lock(&delegation->lock); | |
173 | if (delegation->inode != NULL) | |
174 | inode = igrab(delegation->inode); | |
175 | spin_unlock(&delegation->lock); | |
176 | return inode; | |
177 | } | |
178 | ||
17d2c0a0 DH |
179 | static struct nfs_delegation *nfs_detach_delegation_locked(struct nfs_inode *nfsi, |
180 | const nfs4_stateid *stateid, | |
181 | struct nfs_client *clp) | |
57bfa891 | 182 | { |
17d2c0a0 DH |
183 | struct nfs_delegation *delegation = |
184 | rcu_dereference_protected(nfsi->delegation, | |
185 | lockdep_is_held(&clp->cl_lock)); | |
57bfa891 TM |
186 | |
187 | if (delegation == NULL) | |
188 | goto nomatch; | |
34310430 | 189 | spin_lock(&delegation->lock); |
57bfa891 TM |
190 | if (stateid != NULL && memcmp(delegation->stateid.data, stateid->data, |
191 | sizeof(delegation->stateid.data)) != 0) | |
34310430 | 192 | goto nomatch_unlock; |
57bfa891 | 193 | list_del_rcu(&delegation->super_list); |
86e89489 | 194 | delegation->inode = NULL; |
57bfa891 TM |
195 | nfsi->delegation_state = 0; |
196 | rcu_assign_pointer(nfsi->delegation, NULL); | |
34310430 | 197 | spin_unlock(&delegation->lock); |
57bfa891 | 198 | return delegation; |
34310430 TM |
199 | nomatch_unlock: |
200 | spin_unlock(&delegation->lock); | |
57bfa891 TM |
201 | nomatch: |
202 | return NULL; | |
203 | } | |
204 | ||
1da177e4 LT |
205 | /* |
206 | * Set up a delegation on an inode | |
207 | */ | |
208 | int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res) | |
209 | { | |
7539bbab | 210 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; |
1da177e4 | 211 | struct nfs_inode *nfsi = NFS_I(inode); |
17d2c0a0 | 212 | struct nfs_delegation *delegation, *old_delegation; |
57bfa891 | 213 | struct nfs_delegation *freeme = NULL; |
1da177e4 LT |
214 | int status = 0; |
215 | ||
8535b2be | 216 | delegation = kmalloc(sizeof(*delegation), GFP_NOFS); |
1da177e4 LT |
217 | if (delegation == NULL) |
218 | return -ENOMEM; | |
219 | memcpy(delegation->stateid.data, res->delegation.data, | |
220 | sizeof(delegation->stateid.data)); | |
221 | delegation->type = res->delegation_type; | |
222 | delegation->maxsize = res->maxsize; | |
beb2a5ec | 223 | delegation->change_attr = nfsi->change_attr; |
1da177e4 LT |
224 | delegation->cred = get_rpccred(cred); |
225 | delegation->inode = inode; | |
b7391f44 | 226 | delegation->flags = 1<<NFS_DELEGATION_REFERENCED; |
34310430 | 227 | spin_lock_init(&delegation->lock); |
1da177e4 LT |
228 | |
229 | spin_lock(&clp->cl_lock); | |
17d2c0a0 DH |
230 | old_delegation = rcu_dereference_protected(nfsi->delegation, |
231 | lockdep_is_held(&clp->cl_lock)); | |
232 | if (old_delegation != NULL) { | |
233 | if (memcmp(&delegation->stateid, &old_delegation->stateid, | |
234 | sizeof(old_delegation->stateid)) == 0 && | |
235 | delegation->type == old_delegation->type) { | |
57bfa891 | 236 | goto out; |
1da177e4 | 237 | } |
57bfa891 TM |
238 | /* |
239 | * Deal with broken servers that hand out two | |
240 | * delegations for the same file. | |
241 | */ | |
242 | dfprintk(FILE, "%s: server %s handed out " | |
243 | "a duplicate delegation!\n", | |
3110ff80 | 244 | __func__, clp->cl_hostname); |
17d2c0a0 | 245 | if (delegation->type <= old_delegation->type) { |
57bfa891 TM |
246 | freeme = delegation; |
247 | delegation = NULL; | |
248 | goto out; | |
249 | } | |
17d2c0a0 | 250 | freeme = nfs_detach_delegation_locked(nfsi, NULL, clp); |
1da177e4 | 251 | } |
57bfa891 TM |
252 | list_add_rcu(&delegation->super_list, &clp->cl_delegations); |
253 | nfsi->delegation_state = delegation->type; | |
254 | rcu_assign_pointer(nfsi->delegation, delegation); | |
255 | delegation = NULL; | |
412c77ce TM |
256 | |
257 | /* Ensure we revalidate the attributes and page cache! */ | |
258 | spin_lock(&inode->i_lock); | |
259 | nfsi->cache_validity |= NFS_INO_REVAL_FORCED; | |
260 | spin_unlock(&inode->i_lock); | |
261 | ||
57bfa891 | 262 | out: |
1da177e4 | 263 | spin_unlock(&clp->cl_lock); |
603c83da TM |
264 | if (delegation != NULL) |
265 | nfs_free_delegation(delegation); | |
57bfa891 TM |
266 | if (freeme != NULL) |
267 | nfs_do_return_delegation(inode, freeme, 0); | |
1da177e4 LT |
268 | return status; |
269 | } | |
270 | ||
1da177e4 LT |
271 | /* |
272 | * Basic procedure for returning a delegation to the server | |
273 | */ | |
d18cc1fd | 274 | static int __nfs_inode_return_delegation(struct inode *inode, struct nfs_delegation *delegation, int issync) |
1da177e4 | 275 | { |
1da177e4 | 276 | struct nfs_inode *nfsi = NFS_I(inode); |
d18cc1fd | 277 | int err; |
1da177e4 | 278 | |
3f09df70 TM |
279 | /* |
280 | * Guard against new delegated open/lock/unlock calls and against | |
281 | * state recovery | |
282 | */ | |
1da177e4 | 283 | down_write(&nfsi->rwsem); |
d18cc1fd | 284 | err = nfs_delegation_claim_opens(inode, &delegation->stateid); |
1da177e4 | 285 | up_write(&nfsi->rwsem); |
d18cc1fd TM |
286 | if (err) |
287 | goto out; | |
1da177e4 | 288 | |
d18cc1fd TM |
289 | err = nfs_do_return_delegation(inode, delegation, issync); |
290 | out: | |
291 | return err; | |
90163027 TM |
292 | } |
293 | ||
515d8611 TM |
294 | /* |
295 | * Return all delegations that have been marked for return | |
296 | */ | |
d18cc1fd | 297 | int nfs_client_return_marked_delegations(struct nfs_client *clp) |
515d8611 TM |
298 | { |
299 | struct nfs_delegation *delegation; | |
300 | struct inode *inode; | |
d18cc1fd | 301 | int err = 0; |
515d8611 TM |
302 | |
303 | restart: | |
304 | rcu_read_lock(); | |
305 | list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) { | |
306 | if (!test_and_clear_bit(NFS_DELEGATION_RETURN, &delegation->flags)) | |
307 | continue; | |
308 | inode = nfs_delegation_grab_inode(delegation); | |
309 | if (inode == NULL) | |
310 | continue; | |
311 | spin_lock(&clp->cl_lock); | |
17d2c0a0 | 312 | delegation = nfs_detach_delegation_locked(NFS_I(inode), NULL, clp); |
515d8611 TM |
313 | spin_unlock(&clp->cl_lock); |
314 | rcu_read_unlock(); | |
d18cc1fd TM |
315 | if (delegation != NULL) { |
316 | filemap_flush(inode->i_mapping); | |
317 | err = __nfs_inode_return_delegation(inode, delegation, 0); | |
318 | } | |
515d8611 | 319 | iput(inode); |
d18cc1fd TM |
320 | if (!err) |
321 | goto restart; | |
322 | set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state); | |
323 | return err; | |
515d8611 TM |
324 | } |
325 | rcu_read_unlock(); | |
d18cc1fd | 326 | return 0; |
515d8611 TM |
327 | } |
328 | ||
e6f81075 TM |
329 | /* |
330 | * This function returns the delegation without reclaiming opens | |
331 | * or protecting against delegation reclaims. | |
332 | * It is therefore really only safe to be called from | |
333 | * nfs4_clear_inode() | |
334 | */ | |
335 | void nfs_inode_return_delegation_noreclaim(struct inode *inode) | |
336 | { | |
337 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; | |
338 | struct nfs_inode *nfsi = NFS_I(inode); | |
339 | struct nfs_delegation *delegation; | |
340 | ||
17d2c0a0 | 341 | if (rcu_access_pointer(nfsi->delegation) != NULL) { |
e6f81075 | 342 | spin_lock(&clp->cl_lock); |
17d2c0a0 | 343 | delegation = nfs_detach_delegation_locked(nfsi, NULL, clp); |
e6f81075 TM |
344 | spin_unlock(&clp->cl_lock); |
345 | if (delegation != NULL) | |
346 | nfs_do_return_delegation(inode, delegation, 0); | |
347 | } | |
348 | } | |
349 | ||
90163027 TM |
350 | int nfs_inode_return_delegation(struct inode *inode) |
351 | { | |
352 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; | |
353 | struct nfs_inode *nfsi = NFS_I(inode); | |
354 | struct nfs_delegation *delegation; | |
355 | int err = 0; | |
356 | ||
17d2c0a0 | 357 | if (rcu_access_pointer(nfsi->delegation) != NULL) { |
90163027 | 358 | spin_lock(&clp->cl_lock); |
17d2c0a0 | 359 | delegation = nfs_detach_delegation_locked(nfsi, NULL, clp); |
90163027 | 360 | spin_unlock(&clp->cl_lock); |
d18cc1fd | 361 | if (delegation != NULL) { |
1b924e5f | 362 | nfs_wb_all(inode); |
d18cc1fd TM |
363 | err = __nfs_inode_return_delegation(inode, delegation, 1); |
364 | } | |
90163027 TM |
365 | } |
366 | return err; | |
1da177e4 LT |
367 | } |
368 | ||
6411bd4a TM |
369 | static void nfs_mark_return_delegation(struct nfs_client *clp, struct nfs_delegation *delegation) |
370 | { | |
371 | set_bit(NFS_DELEGATION_RETURN, &delegation->flags); | |
372 | set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state); | |
373 | } | |
374 | ||
1da177e4 LT |
375 | /* |
376 | * Return all delegations associated to a super block | |
377 | */ | |
515d8611 | 378 | void nfs_super_return_all_delegations(struct super_block *sb) |
1da177e4 | 379 | { |
7539bbab | 380 | struct nfs_client *clp = NFS_SB(sb)->nfs_client; |
1da177e4 | 381 | struct nfs_delegation *delegation; |
1da177e4 LT |
382 | |
383 | if (clp == NULL) | |
384 | return; | |
8383e460 TM |
385 | rcu_read_lock(); |
386 | list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) { | |
86e89489 TM |
387 | spin_lock(&delegation->lock); |
388 | if (delegation->inode != NULL && delegation->inode->i_sb == sb) | |
515d8611 | 389 | set_bit(NFS_DELEGATION_RETURN, &delegation->flags); |
86e89489 | 390 | spin_unlock(&delegation->lock); |
1da177e4 | 391 | } |
8383e460 | 392 | rcu_read_unlock(); |
d18cc1fd TM |
393 | if (nfs_client_return_marked_delegations(clp) != 0) |
394 | nfs4_schedule_state_manager(clp); | |
515d8611 TM |
395 | } |
396 | ||
c79571a5 AB |
397 | static |
398 | void nfs_client_mark_return_all_delegation_types(struct nfs_client *clp, fmode_t flags) | |
515d8611 TM |
399 | { |
400 | struct nfs_delegation *delegation; | |
401 | ||
402 | rcu_read_lock(); | |
707fb4b3 | 403 | list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) { |
c79571a5 AB |
404 | if ((delegation->type == (FMODE_READ|FMODE_WRITE)) && !(flags & FMODE_WRITE)) |
405 | continue; | |
406 | if (delegation->type & flags) | |
407 | nfs_mark_return_delegation(clp, delegation); | |
707fb4b3 | 408 | } |
515d8611 | 409 | rcu_read_unlock(); |
1da177e4 LT |
410 | } |
411 | ||
c79571a5 AB |
412 | static void nfs_client_mark_return_all_delegations(struct nfs_client *clp) |
413 | { | |
414 | nfs_client_mark_return_all_delegation_types(clp, FMODE_READ|FMODE_WRITE); | |
415 | } | |
416 | ||
b0d3ded1 | 417 | static void nfs_delegation_run_state_manager(struct nfs_client *clp) |
58d9714a | 418 | { |
b0d3ded1 TM |
419 | if (test_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) |
420 | nfs4_schedule_state_manager(clp); | |
58d9714a TM |
421 | } |
422 | ||
31f09607 | 423 | void nfs_expire_all_delegation_types(struct nfs_client *clp, fmode_t flags) |
58d9714a | 424 | { |
c79571a5 | 425 | nfs_client_mark_return_all_delegation_types(clp, flags); |
b0d3ded1 | 426 | nfs_delegation_run_state_manager(clp); |
58d9714a TM |
427 | } |
428 | ||
c79571a5 AB |
429 | void nfs_expire_all_delegations(struct nfs_client *clp) |
430 | { | |
431 | nfs_expire_all_delegation_types(clp, FMODE_READ|FMODE_WRITE); | |
432 | } | |
433 | ||
1da177e4 LT |
434 | /* |
435 | * Return all delegations following an NFS4ERR_CB_PATH_DOWN error. | |
436 | */ | |
adfa6f98 | 437 | void nfs_handle_cb_pathdown(struct nfs_client *clp) |
1da177e4 | 438 | { |
1da177e4 LT |
439 | if (clp == NULL) |
440 | return; | |
707fb4b3 | 441 | nfs_client_mark_return_all_delegations(clp); |
1da177e4 LT |
442 | } |
443 | ||
b7391f44 TM |
444 | static void nfs_client_mark_return_unreferenced_delegations(struct nfs_client *clp) |
445 | { | |
446 | struct nfs_delegation *delegation; | |
447 | ||
448 | rcu_read_lock(); | |
449 | list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) { | |
450 | if (test_and_clear_bit(NFS_DELEGATION_REFERENCED, &delegation->flags)) | |
451 | continue; | |
b4a6f496 | 452 | nfs_mark_return_delegation(clp, delegation); |
b7391f44 TM |
453 | } |
454 | rcu_read_unlock(); | |
455 | } | |
456 | ||
457 | void nfs_expire_unreferenced_delegations(struct nfs_client *clp) | |
458 | { | |
459 | nfs_client_mark_return_unreferenced_delegations(clp); | |
460 | nfs_delegation_run_state_manager(clp); | |
461 | } | |
462 | ||
1da177e4 LT |
463 | /* |
464 | * Asynchronous delegation recall! | |
465 | */ | |
e047a10c | 466 | int nfs_async_inode_return_delegation(struct inode *inode, const nfs4_stateid *stateid) |
1da177e4 | 467 | { |
6411bd4a TM |
468 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; |
469 | struct nfs_delegation *delegation; | |
1da177e4 | 470 | |
6411bd4a TM |
471 | rcu_read_lock(); |
472 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
2597641d | 473 | |
e047a10c | 474 | if (!clp->cl_mvops->validate_stateid(delegation, stateid)) { |
6411bd4a TM |
475 | rcu_read_unlock(); |
476 | return -ENOENT; | |
477 | } | |
2597641d | 478 | |
6411bd4a TM |
479 | nfs_mark_return_delegation(clp, delegation); |
480 | rcu_read_unlock(); | |
481 | nfs_delegation_run_state_manager(clp); | |
482 | return 0; | |
1da177e4 LT |
483 | } |
484 | ||
485 | /* | |
486 | * Retrieve the inode associated with a delegation | |
487 | */ | |
adfa6f98 | 488 | struct inode *nfs_delegation_find_inode(struct nfs_client *clp, const struct nfs_fh *fhandle) |
1da177e4 LT |
489 | { |
490 | struct nfs_delegation *delegation; | |
491 | struct inode *res = NULL; | |
8383e460 TM |
492 | rcu_read_lock(); |
493 | list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) { | |
86e89489 TM |
494 | spin_lock(&delegation->lock); |
495 | if (delegation->inode != NULL && | |
496 | nfs_compare_fh(fhandle, &NFS_I(delegation->inode)->fh) == 0) { | |
1da177e4 | 497 | res = igrab(delegation->inode); |
1da177e4 | 498 | } |
86e89489 TM |
499 | spin_unlock(&delegation->lock); |
500 | if (res != NULL) | |
501 | break; | |
1da177e4 | 502 | } |
8383e460 | 503 | rcu_read_unlock(); |
1da177e4 LT |
504 | return res; |
505 | } | |
506 | ||
507 | /* | |
508 | * Mark all delegations as needing to be reclaimed | |
509 | */ | |
adfa6f98 | 510 | void nfs_delegation_mark_reclaim(struct nfs_client *clp) |
1da177e4 LT |
511 | { |
512 | struct nfs_delegation *delegation; | |
8383e460 TM |
513 | rcu_read_lock(); |
514 | list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) | |
15c831bf | 515 | set_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags); |
8383e460 | 516 | rcu_read_unlock(); |
1da177e4 LT |
517 | } |
518 | ||
519 | /* | |
520 | * Reap all unclaimed delegations after reboot recovery is done | |
521 | */ | |
adfa6f98 | 522 | void nfs_delegation_reap_unclaimed(struct nfs_client *clp) |
1da177e4 | 523 | { |
8383e460 | 524 | struct nfs_delegation *delegation; |
86e89489 | 525 | struct inode *inode; |
8383e460 TM |
526 | restart: |
527 | rcu_read_lock(); | |
528 | list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) { | |
15c831bf | 529 | if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) |
1da177e4 | 530 | continue; |
86e89489 TM |
531 | inode = nfs_delegation_grab_inode(delegation); |
532 | if (inode == NULL) | |
533 | continue; | |
8383e460 | 534 | spin_lock(&clp->cl_lock); |
17d2c0a0 | 535 | delegation = nfs_detach_delegation_locked(NFS_I(inode), NULL, clp); |
8383e460 TM |
536 | spin_unlock(&clp->cl_lock); |
537 | rcu_read_unlock(); | |
538 | if (delegation != NULL) | |
905f8d16 | 539 | nfs_free_delegation(delegation); |
86e89489 | 540 | iput(inode); |
8383e460 | 541 | goto restart; |
1da177e4 | 542 | } |
8383e460 | 543 | rcu_read_unlock(); |
1da177e4 | 544 | } |
3e4f6290 TM |
545 | |
546 | int nfs4_copy_delegation_stateid(nfs4_stateid *dst, struct inode *inode) | |
547 | { | |
3e4f6290 TM |
548 | struct nfs_inode *nfsi = NFS_I(inode); |
549 | struct nfs_delegation *delegation; | |
8383e460 | 550 | int ret = 0; |
3e4f6290 | 551 | |
8383e460 TM |
552 | rcu_read_lock(); |
553 | delegation = rcu_dereference(nfsi->delegation); | |
3e4f6290 TM |
554 | if (delegation != NULL) { |
555 | memcpy(dst->data, delegation->stateid.data, sizeof(dst->data)); | |
8383e460 | 556 | ret = 1; |
3e4f6290 | 557 | } |
8383e460 TM |
558 | rcu_read_unlock(); |
559 | return ret; | |
3e4f6290 | 560 | } |