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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> |
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 TM |
24 | static void nfs_free_delegation(struct nfs_delegation *delegation) |
25 | { | |
e00b8a24 TM |
26 | if (delegation->cred) { |
27 | put_rpccred(delegation->cred); | |
28 | delegation->cred = NULL; | |
29 | } | |
26f04dde | 30 | kfree_rcu(delegation, rcu); |
8383e460 TM |
31 | } |
32 | ||
d3978bb3 CL |
33 | /** |
34 | * nfs_mark_delegation_referenced - set delegation's REFERENCED flag | |
35 | * @delegation: delegation to process | |
36 | * | |
37 | */ | |
b7391f44 TM |
38 | void nfs_mark_delegation_referenced(struct nfs_delegation *delegation) |
39 | { | |
40 | set_bit(NFS_DELEGATION_REFERENCED, &delegation->flags); | |
41 | } | |
42 | ||
d3978bb3 CL |
43 | /** |
44 | * nfs_have_delegation - check if inode has a delegation | |
45 | * @inode: inode to check | |
46 | * @flags: delegation types to check for | |
47 | * | |
48 | * Returns one if inode has the indicated delegation, otherwise zero. | |
49 | */ | |
bd7bf9d5 | 50 | int nfs_have_delegation(struct inode *inode, fmode_t flags) |
b7391f44 TM |
51 | { |
52 | struct nfs_delegation *delegation; | |
53 | int ret = 0; | |
54 | ||
55 | flags &= FMODE_READ|FMODE_WRITE; | |
56 | rcu_read_lock(); | |
57 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
58 | if (delegation != NULL && (delegation->type & flags) == flags) { | |
59 | nfs_mark_delegation_referenced(delegation); | |
60 | ret = 1; | |
61 | } | |
62 | rcu_read_unlock(); | |
63 | return ret; | |
64 | } | |
65 | ||
888e694c TM |
66 | static int nfs_delegation_claim_locks(struct nfs_open_context *ctx, struct nfs4_state *state) |
67 | { | |
68 | struct inode *inode = state->inode; | |
69 | struct file_lock *fl; | |
d5122201 | 70 | int status = 0; |
888e694c | 71 | |
3f09df70 TM |
72 | if (inode->i_flock == NULL) |
73 | goto out; | |
74 | ||
b89f4321 AB |
75 | /* Protect inode->i_flock using the file locks lock */ |
76 | lock_flocks(); | |
90dc7d27 | 77 | for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) { |
888e694c TM |
78 | if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK))) |
79 | continue; | |
cd3758e3 | 80 | if (nfs_file_open_context(fl->fl_file) != ctx) |
888e694c | 81 | continue; |
b89f4321 | 82 | unlock_flocks(); |
888e694c | 83 | status = nfs4_lock_delegation_recall(state, fl); |
d5122201 | 84 | if (status < 0) |
3f09df70 | 85 | goto out; |
b89f4321 | 86 | lock_flocks(); |
888e694c | 87 | } |
b89f4321 | 88 | unlock_flocks(); |
3f09df70 | 89 | out: |
888e694c TM |
90 | return status; |
91 | } | |
92 | ||
d18cc1fd | 93 | static int nfs_delegation_claim_opens(struct inode *inode, const nfs4_stateid *stateid) |
1da177e4 LT |
94 | { |
95 | struct nfs_inode *nfsi = NFS_I(inode); | |
96 | struct nfs_open_context *ctx; | |
97 | struct nfs4_state *state; | |
888e694c | 98 | int err; |
1da177e4 LT |
99 | |
100 | again: | |
101 | spin_lock(&inode->i_lock); | |
102 | list_for_each_entry(ctx, &nfsi->open_files, list) { | |
103 | state = ctx->state; | |
104 | if (state == NULL) | |
105 | continue; | |
106 | if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) | |
107 | continue; | |
90163027 TM |
108 | if (memcmp(state->stateid.data, stateid->data, sizeof(state->stateid.data)) != 0) |
109 | continue; | |
1da177e4 LT |
110 | get_nfs_open_context(ctx); |
111 | spin_unlock(&inode->i_lock); | |
13437e12 | 112 | err = nfs4_open_delegation_recall(ctx, state, stateid); |
888e694c TM |
113 | if (err >= 0) |
114 | err = nfs_delegation_claim_locks(ctx, state); | |
1da177e4 | 115 | put_nfs_open_context(ctx); |
888e694c | 116 | if (err != 0) |
d18cc1fd | 117 | return err; |
1da177e4 LT |
118 | goto again; |
119 | } | |
120 | spin_unlock(&inode->i_lock); | |
d18cc1fd | 121 | return 0; |
1da177e4 LT |
122 | } |
123 | ||
d3978bb3 CL |
124 | /** |
125 | * nfs_inode_reclaim_delegation - process a delegation reclaim request | |
126 | * @inode: inode to process | |
127 | * @cred: credential to use for request | |
128 | * @res: new delegation state from server | |
129 | * | |
1da177e4 | 130 | */ |
d3978bb3 CL |
131 | void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, |
132 | struct nfs_openres *res) | |
1da177e4 | 133 | { |
8f649c37 TM |
134 | struct nfs_delegation *delegation; |
135 | struct rpc_cred *oldcred = NULL; | |
1da177e4 | 136 | |
8f649c37 TM |
137 | rcu_read_lock(); |
138 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
139 | if (delegation != NULL) { | |
140 | spin_lock(&delegation->lock); | |
141 | if (delegation->inode != NULL) { | |
142 | memcpy(delegation->stateid.data, res->delegation.data, | |
143 | sizeof(delegation->stateid.data)); | |
144 | delegation->type = res->delegation_type; | |
145 | delegation->maxsize = res->maxsize; | |
146 | oldcred = delegation->cred; | |
147 | delegation->cred = get_rpccred(cred); | |
148 | clear_bit(NFS_DELEGATION_NEED_RECLAIM, | |
149 | &delegation->flags); | |
150 | NFS_I(inode)->delegation_state = delegation->type; | |
151 | spin_unlock(&delegation->lock); | |
152 | put_rpccred(oldcred); | |
153 | rcu_read_unlock(); | |
154 | } else { | |
155 | /* We appear to have raced with a delegation return. */ | |
156 | spin_unlock(&delegation->lock); | |
157 | rcu_read_unlock(); | |
158 | nfs_inode_set_delegation(inode, cred, res); | |
159 | } | |
160 | } else { | |
161 | rcu_read_unlock(); | |
162 | } | |
1da177e4 LT |
163 | } |
164 | ||
57bfa891 TM |
165 | static int nfs_do_return_delegation(struct inode *inode, struct nfs_delegation *delegation, int issync) |
166 | { | |
167 | int res = 0; | |
168 | ||
169 | res = nfs4_proc_delegreturn(inode, delegation->cred, &delegation->stateid, issync); | |
170 | nfs_free_delegation(delegation); | |
171 | return res; | |
172 | } | |
173 | ||
86e89489 TM |
174 | static struct inode *nfs_delegation_grab_inode(struct nfs_delegation *delegation) |
175 | { | |
176 | struct inode *inode = NULL; | |
177 | ||
178 | spin_lock(&delegation->lock); | |
179 | if (delegation->inode != NULL) | |
180 | inode = igrab(delegation->inode); | |
181 | spin_unlock(&delegation->lock); | |
182 | return inode; | |
183 | } | |
184 | ||
dda4b225 CL |
185 | static struct nfs_delegation * |
186 | nfs_detach_delegation_locked(struct nfs_inode *nfsi, | |
d3978bb3 | 187 | struct nfs_server *server) |
57bfa891 | 188 | { |
17d2c0a0 DH |
189 | struct nfs_delegation *delegation = |
190 | rcu_dereference_protected(nfsi->delegation, | |
d3978bb3 | 191 | lockdep_is_held(&server->nfs_client->cl_lock)); |
57bfa891 TM |
192 | |
193 | if (delegation == NULL) | |
194 | goto nomatch; | |
dda4b225 | 195 | |
34310430 | 196 | spin_lock(&delegation->lock); |
57bfa891 | 197 | list_del_rcu(&delegation->super_list); |
86e89489 | 198 | delegation->inode = NULL; |
57bfa891 TM |
199 | nfsi->delegation_state = 0; |
200 | rcu_assign_pointer(nfsi->delegation, NULL); | |
34310430 | 201 | spin_unlock(&delegation->lock); |
57bfa891 TM |
202 | return delegation; |
203 | nomatch: | |
204 | return NULL; | |
205 | } | |
206 | ||
dda4b225 | 207 | static struct nfs_delegation *nfs_detach_delegation(struct nfs_inode *nfsi, |
d3978bb3 | 208 | struct nfs_server *server) |
dda4b225 | 209 | { |
d3978bb3 | 210 | struct nfs_client *clp = server->nfs_client; |
dda4b225 CL |
211 | struct nfs_delegation *delegation; |
212 | ||
213 | spin_lock(&clp->cl_lock); | |
d3978bb3 | 214 | delegation = nfs_detach_delegation_locked(nfsi, server); |
dda4b225 CL |
215 | spin_unlock(&clp->cl_lock); |
216 | return delegation; | |
217 | } | |
218 | ||
d3978bb3 CL |
219 | /** |
220 | * nfs_inode_set_delegation - set up a delegation on an inode | |
221 | * @inode: inode to which delegation applies | |
222 | * @cred: cred to use for subsequent delegation processing | |
223 | * @res: new delegation state from server | |
224 | * | |
225 | * Returns zero on success, or a negative errno value. | |
1da177e4 LT |
226 | */ |
227 | int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res) | |
228 | { | |
d3978bb3 CL |
229 | struct nfs_server *server = NFS_SERVER(inode); |
230 | struct nfs_client *clp = server->nfs_client; | |
1da177e4 | 231 | struct nfs_inode *nfsi = NFS_I(inode); |
17d2c0a0 | 232 | struct nfs_delegation *delegation, *old_delegation; |
57bfa891 | 233 | struct nfs_delegation *freeme = NULL; |
1da177e4 LT |
234 | int status = 0; |
235 | ||
8535b2be | 236 | delegation = kmalloc(sizeof(*delegation), GFP_NOFS); |
1da177e4 LT |
237 | if (delegation == NULL) |
238 | return -ENOMEM; | |
239 | memcpy(delegation->stateid.data, res->delegation.data, | |
240 | sizeof(delegation->stateid.data)); | |
241 | delegation->type = res->delegation_type; | |
242 | delegation->maxsize = res->maxsize; | |
a9a4a87a | 243 | delegation->change_attr = inode->i_version; |
1da177e4 LT |
244 | delegation->cred = get_rpccred(cred); |
245 | delegation->inode = inode; | |
b7391f44 | 246 | delegation->flags = 1<<NFS_DELEGATION_REFERENCED; |
34310430 | 247 | spin_lock_init(&delegation->lock); |
1da177e4 LT |
248 | |
249 | spin_lock(&clp->cl_lock); | |
17d2c0a0 | 250 | old_delegation = rcu_dereference_protected(nfsi->delegation, |
d3978bb3 | 251 | lockdep_is_held(&clp->cl_lock)); |
17d2c0a0 DH |
252 | if (old_delegation != NULL) { |
253 | if (memcmp(&delegation->stateid, &old_delegation->stateid, | |
254 | sizeof(old_delegation->stateid)) == 0 && | |
255 | delegation->type == old_delegation->type) { | |
57bfa891 | 256 | goto out; |
1da177e4 | 257 | } |
57bfa891 TM |
258 | /* |
259 | * Deal with broken servers that hand out two | |
260 | * delegations for the same file. | |
261 | */ | |
262 | dfprintk(FILE, "%s: server %s handed out " | |
263 | "a duplicate delegation!\n", | |
3110ff80 | 264 | __func__, clp->cl_hostname); |
17d2c0a0 | 265 | if (delegation->type <= old_delegation->type) { |
57bfa891 TM |
266 | freeme = delegation; |
267 | delegation = NULL; | |
268 | goto out; | |
269 | } | |
d3978bb3 | 270 | freeme = nfs_detach_delegation_locked(nfsi, server); |
1da177e4 | 271 | } |
d3978bb3 | 272 | list_add_rcu(&delegation->super_list, &server->delegations); |
57bfa891 TM |
273 | nfsi->delegation_state = delegation->type; |
274 | rcu_assign_pointer(nfsi->delegation, delegation); | |
275 | delegation = NULL; | |
412c77ce TM |
276 | |
277 | /* Ensure we revalidate the attributes and page cache! */ | |
278 | spin_lock(&inode->i_lock); | |
279 | nfsi->cache_validity |= NFS_INO_REVAL_FORCED; | |
280 | spin_unlock(&inode->i_lock); | |
281 | ||
57bfa891 | 282 | out: |
1da177e4 | 283 | spin_unlock(&clp->cl_lock); |
603c83da TM |
284 | if (delegation != NULL) |
285 | nfs_free_delegation(delegation); | |
57bfa891 TM |
286 | if (freeme != NULL) |
287 | nfs_do_return_delegation(inode, freeme, 0); | |
1da177e4 LT |
288 | return status; |
289 | } | |
290 | ||
1da177e4 LT |
291 | /* |
292 | * Basic procedure for returning a delegation to the server | |
293 | */ | |
d18cc1fd | 294 | static int __nfs_inode_return_delegation(struct inode *inode, struct nfs_delegation *delegation, int issync) |
1da177e4 | 295 | { |
1da177e4 | 296 | struct nfs_inode *nfsi = NFS_I(inode); |
d18cc1fd | 297 | int err; |
1da177e4 | 298 | |
3f09df70 TM |
299 | /* |
300 | * Guard against new delegated open/lock/unlock calls and against | |
301 | * state recovery | |
302 | */ | |
1da177e4 | 303 | down_write(&nfsi->rwsem); |
d18cc1fd | 304 | err = nfs_delegation_claim_opens(inode, &delegation->stateid); |
1da177e4 | 305 | up_write(&nfsi->rwsem); |
d18cc1fd TM |
306 | if (err) |
307 | goto out; | |
1da177e4 | 308 | |
d18cc1fd TM |
309 | err = nfs_do_return_delegation(inode, delegation, issync); |
310 | out: | |
311 | return err; | |
90163027 TM |
312 | } |
313 | ||
d3978bb3 CL |
314 | /** |
315 | * nfs_client_return_marked_delegations - return previously marked delegations | |
316 | * @clp: nfs_client to process | |
317 | * | |
318 | * Returns zero on success, or a negative errno value. | |
515d8611 | 319 | */ |
d18cc1fd | 320 | int nfs_client_return_marked_delegations(struct nfs_client *clp) |
515d8611 TM |
321 | { |
322 | struct nfs_delegation *delegation; | |
d3978bb3 | 323 | struct nfs_server *server; |
515d8611 | 324 | struct inode *inode; |
d18cc1fd | 325 | int err = 0; |
515d8611 TM |
326 | |
327 | restart: | |
328 | rcu_read_lock(); | |
d3978bb3 CL |
329 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { |
330 | list_for_each_entry_rcu(delegation, &server->delegations, | |
331 | super_list) { | |
332 | if (!test_and_clear_bit(NFS_DELEGATION_RETURN, | |
333 | &delegation->flags)) | |
334 | continue; | |
335 | inode = nfs_delegation_grab_inode(delegation); | |
336 | if (inode == NULL) | |
337 | continue; | |
338 | delegation = nfs_detach_delegation(NFS_I(inode), | |
339 | server); | |
340 | rcu_read_unlock(); | |
341 | ||
342 | if (delegation != NULL) { | |
343 | filemap_flush(inode->i_mapping); | |
344 | err = __nfs_inode_return_delegation(inode, | |
345 | delegation, 0); | |
346 | } | |
347 | iput(inode); | |
348 | if (!err) | |
349 | goto restart; | |
350 | set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state); | |
351 | return err; | |
d18cc1fd | 352 | } |
515d8611 TM |
353 | } |
354 | rcu_read_unlock(); | |
d18cc1fd | 355 | return 0; |
515d8611 TM |
356 | } |
357 | ||
d3978bb3 CL |
358 | /** |
359 | * nfs_inode_return_delegation_noreclaim - return delegation, don't reclaim opens | |
360 | * @inode: inode to process | |
361 | * | |
362 | * Does not protect against delegation reclaims, therefore really only safe | |
363 | * to be called from nfs4_clear_inode(). | |
e6f81075 TM |
364 | */ |
365 | void nfs_inode_return_delegation_noreclaim(struct inode *inode) | |
366 | { | |
d3978bb3 | 367 | struct nfs_server *server = NFS_SERVER(inode); |
e6f81075 TM |
368 | struct nfs_inode *nfsi = NFS_I(inode); |
369 | struct nfs_delegation *delegation; | |
370 | ||
17d2c0a0 | 371 | if (rcu_access_pointer(nfsi->delegation) != NULL) { |
d3978bb3 | 372 | delegation = nfs_detach_delegation(nfsi, server); |
e6f81075 TM |
373 | if (delegation != NULL) |
374 | nfs_do_return_delegation(inode, delegation, 0); | |
375 | } | |
376 | } | |
377 | ||
d3978bb3 CL |
378 | /** |
379 | * nfs_inode_return_delegation - synchronously return a delegation | |
380 | * @inode: inode to process | |
381 | * | |
382 | * Returns zero on success, or a negative errno value. | |
383 | */ | |
90163027 TM |
384 | int nfs_inode_return_delegation(struct inode *inode) |
385 | { | |
d3978bb3 | 386 | struct nfs_server *server = NFS_SERVER(inode); |
90163027 TM |
387 | struct nfs_inode *nfsi = NFS_I(inode); |
388 | struct nfs_delegation *delegation; | |
389 | int err = 0; | |
390 | ||
17d2c0a0 | 391 | if (rcu_access_pointer(nfsi->delegation) != NULL) { |
d3978bb3 | 392 | delegation = nfs_detach_delegation(nfsi, server); |
d18cc1fd | 393 | if (delegation != NULL) { |
1b924e5f | 394 | nfs_wb_all(inode); |
d18cc1fd TM |
395 | err = __nfs_inode_return_delegation(inode, delegation, 1); |
396 | } | |
90163027 TM |
397 | } |
398 | return err; | |
1da177e4 LT |
399 | } |
400 | ||
ed1e6211 TM |
401 | static void nfs_mark_return_delegation(struct nfs_server *server, |
402 | struct nfs_delegation *delegation) | |
6411bd4a TM |
403 | { |
404 | set_bit(NFS_DELEGATION_RETURN, &delegation->flags); | |
ed1e6211 | 405 | set_bit(NFS4CLNT_DELEGRETURN, &server->nfs_client->cl_state); |
6411bd4a TM |
406 | } |
407 | ||
d3978bb3 CL |
408 | /** |
409 | * nfs_super_return_all_delegations - return delegations for one superblock | |
410 | * @sb: sb to process | |
411 | * | |
1da177e4 | 412 | */ |
515d8611 | 413 | void nfs_super_return_all_delegations(struct super_block *sb) |
1da177e4 | 414 | { |
d3978bb3 CL |
415 | struct nfs_server *server = NFS_SB(sb); |
416 | struct nfs_client *clp = server->nfs_client; | |
1da177e4 | 417 | struct nfs_delegation *delegation; |
1da177e4 LT |
418 | |
419 | if (clp == NULL) | |
420 | return; | |
d3978bb3 | 421 | |
8383e460 | 422 | rcu_read_lock(); |
d3978bb3 | 423 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { |
86e89489 | 424 | spin_lock(&delegation->lock); |
d3978bb3 | 425 | set_bit(NFS_DELEGATION_RETURN, &delegation->flags); |
86e89489 | 426 | spin_unlock(&delegation->lock); |
1da177e4 | 427 | } |
8383e460 | 428 | rcu_read_unlock(); |
d3978bb3 | 429 | |
d18cc1fd TM |
430 | if (nfs_client_return_marked_delegations(clp) != 0) |
431 | nfs4_schedule_state_manager(clp); | |
515d8611 TM |
432 | } |
433 | ||
d3978bb3 CL |
434 | static void nfs_mark_return_all_delegation_types(struct nfs_server *server, |
435 | fmode_t flags) | |
515d8611 TM |
436 | { |
437 | struct nfs_delegation *delegation; | |
438 | ||
d3978bb3 | 439 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { |
c79571a5 AB |
440 | if ((delegation->type == (FMODE_READ|FMODE_WRITE)) && !(flags & FMODE_WRITE)) |
441 | continue; | |
442 | if (delegation->type & flags) | |
ed1e6211 | 443 | nfs_mark_return_delegation(server, delegation); |
707fb4b3 | 444 | } |
d3978bb3 CL |
445 | } |
446 | ||
447 | static void nfs_client_mark_return_all_delegation_types(struct nfs_client *clp, | |
448 | fmode_t flags) | |
449 | { | |
450 | struct nfs_server *server; | |
451 | ||
452 | rcu_read_lock(); | |
453 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
454 | nfs_mark_return_all_delegation_types(server, flags); | |
515d8611 | 455 | rcu_read_unlock(); |
1da177e4 LT |
456 | } |
457 | ||
c79571a5 AB |
458 | static void nfs_client_mark_return_all_delegations(struct nfs_client *clp) |
459 | { | |
460 | nfs_client_mark_return_all_delegation_types(clp, FMODE_READ|FMODE_WRITE); | |
461 | } | |
462 | ||
b0d3ded1 | 463 | static void nfs_delegation_run_state_manager(struct nfs_client *clp) |
58d9714a | 464 | { |
b0d3ded1 TM |
465 | if (test_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) |
466 | nfs4_schedule_state_manager(clp); | |
58d9714a TM |
467 | } |
468 | ||
d3978bb3 CL |
469 | /** |
470 | * nfs_expire_all_delegation_types | |
471 | * @clp: client to process | |
472 | * @flags: delegation types to expire | |
473 | * | |
474 | */ | |
31f09607 | 475 | void nfs_expire_all_delegation_types(struct nfs_client *clp, fmode_t flags) |
58d9714a | 476 | { |
c79571a5 | 477 | nfs_client_mark_return_all_delegation_types(clp, flags); |
b0d3ded1 | 478 | nfs_delegation_run_state_manager(clp); |
58d9714a TM |
479 | } |
480 | ||
d3978bb3 CL |
481 | /** |
482 | * nfs_expire_all_delegations | |
483 | * @clp: client to process | |
484 | * | |
485 | */ | |
c79571a5 AB |
486 | void nfs_expire_all_delegations(struct nfs_client *clp) |
487 | { | |
488 | nfs_expire_all_delegation_types(clp, FMODE_READ|FMODE_WRITE); | |
489 | } | |
490 | ||
d3978bb3 CL |
491 | /** |
492 | * nfs_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN | |
493 | * @clp: client to process | |
494 | * | |
1da177e4 | 495 | */ |
adfa6f98 | 496 | void nfs_handle_cb_pathdown(struct nfs_client *clp) |
1da177e4 | 497 | { |
1da177e4 LT |
498 | if (clp == NULL) |
499 | return; | |
707fb4b3 | 500 | nfs_client_mark_return_all_delegations(clp); |
1da177e4 LT |
501 | } |
502 | ||
d3978bb3 | 503 | static void nfs_mark_return_unreferenced_delegations(struct nfs_server *server) |
b7391f44 TM |
504 | { |
505 | struct nfs_delegation *delegation; | |
506 | ||
d3978bb3 | 507 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { |
b7391f44 TM |
508 | if (test_and_clear_bit(NFS_DELEGATION_REFERENCED, &delegation->flags)) |
509 | continue; | |
ed1e6211 | 510 | nfs_mark_return_delegation(server, delegation); |
b7391f44 | 511 | } |
b7391f44 TM |
512 | } |
513 | ||
d3978bb3 CL |
514 | /** |
515 | * nfs_expire_unreferenced_delegations - Eliminate unused delegations | |
516 | * @clp: nfs_client to process | |
517 | * | |
518 | */ | |
b7391f44 TM |
519 | void nfs_expire_unreferenced_delegations(struct nfs_client *clp) |
520 | { | |
d3978bb3 CL |
521 | struct nfs_server *server; |
522 | ||
523 | rcu_read_lock(); | |
524 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
525 | nfs_mark_return_unreferenced_delegations(server); | |
526 | rcu_read_unlock(); | |
527 | ||
b7391f44 TM |
528 | nfs_delegation_run_state_manager(clp); |
529 | } | |
530 | ||
d3978bb3 CL |
531 | /** |
532 | * nfs_async_inode_return_delegation - asynchronously return a delegation | |
533 | * @inode: inode to process | |
534 | * @stateid: state ID information from CB_RECALL arguments | |
535 | * | |
536 | * Returns zero on success, or a negative errno value. | |
1da177e4 | 537 | */ |
d3978bb3 CL |
538 | int nfs_async_inode_return_delegation(struct inode *inode, |
539 | const nfs4_stateid *stateid) | |
1da177e4 | 540 | { |
ed1e6211 TM |
541 | struct nfs_server *server = NFS_SERVER(inode); |
542 | struct nfs_client *clp = server->nfs_client; | |
6411bd4a | 543 | struct nfs_delegation *delegation; |
1da177e4 | 544 | |
6411bd4a TM |
545 | rcu_read_lock(); |
546 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
2597641d | 547 | |
e047a10c | 548 | if (!clp->cl_mvops->validate_stateid(delegation, stateid)) { |
6411bd4a TM |
549 | rcu_read_unlock(); |
550 | return -ENOENT; | |
551 | } | |
ed1e6211 | 552 | nfs_mark_return_delegation(server, delegation); |
6411bd4a | 553 | rcu_read_unlock(); |
d3978bb3 | 554 | |
6411bd4a TM |
555 | nfs_delegation_run_state_manager(clp); |
556 | return 0; | |
1da177e4 LT |
557 | } |
558 | ||
d3978bb3 CL |
559 | static struct inode * |
560 | nfs_delegation_find_inode_server(struct nfs_server *server, | |
561 | const struct nfs_fh *fhandle) | |
1da177e4 LT |
562 | { |
563 | struct nfs_delegation *delegation; | |
564 | struct inode *res = NULL; | |
d3978bb3 CL |
565 | |
566 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { | |
86e89489 TM |
567 | spin_lock(&delegation->lock); |
568 | if (delegation->inode != NULL && | |
569 | nfs_compare_fh(fhandle, &NFS_I(delegation->inode)->fh) == 0) { | |
1da177e4 | 570 | res = igrab(delegation->inode); |
1da177e4 | 571 | } |
86e89489 TM |
572 | spin_unlock(&delegation->lock); |
573 | if (res != NULL) | |
574 | break; | |
1da177e4 | 575 | } |
d3978bb3 CL |
576 | return res; |
577 | } | |
578 | ||
579 | /** | |
580 | * nfs_delegation_find_inode - retrieve the inode associated with a delegation | |
581 | * @clp: client state handle | |
582 | * @fhandle: filehandle from a delegation recall | |
583 | * | |
584 | * Returns pointer to inode matching "fhandle," or NULL if a matching inode | |
585 | * cannot be found. | |
586 | */ | |
587 | struct inode *nfs_delegation_find_inode(struct nfs_client *clp, | |
588 | const struct nfs_fh *fhandle) | |
589 | { | |
590 | struct nfs_server *server; | |
591 | struct inode *res = NULL; | |
592 | ||
593 | rcu_read_lock(); | |
594 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { | |
595 | res = nfs_delegation_find_inode_server(server, fhandle); | |
596 | if (res != NULL) | |
597 | break; | |
598 | } | |
8383e460 | 599 | rcu_read_unlock(); |
1da177e4 LT |
600 | return res; |
601 | } | |
602 | ||
d3978bb3 CL |
603 | static void nfs_delegation_mark_reclaim_server(struct nfs_server *server) |
604 | { | |
605 | struct nfs_delegation *delegation; | |
606 | ||
607 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) | |
608 | set_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags); | |
609 | } | |
610 | ||
611 | /** | |
612 | * nfs_delegation_mark_reclaim - mark all delegations as needing to be reclaimed | |
613 | * @clp: nfs_client to process | |
614 | * | |
1da177e4 | 615 | */ |
adfa6f98 | 616 | void nfs_delegation_mark_reclaim(struct nfs_client *clp) |
1da177e4 | 617 | { |
d3978bb3 CL |
618 | struct nfs_server *server; |
619 | ||
8383e460 | 620 | rcu_read_lock(); |
d3978bb3 CL |
621 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) |
622 | nfs_delegation_mark_reclaim_server(server); | |
8383e460 | 623 | rcu_read_unlock(); |
1da177e4 LT |
624 | } |
625 | ||
d3978bb3 CL |
626 | /** |
627 | * nfs_delegation_reap_unclaimed - reap unclaimed delegations after reboot recovery is done | |
628 | * @clp: nfs_client to process | |
629 | * | |
1da177e4 | 630 | */ |
adfa6f98 | 631 | void nfs_delegation_reap_unclaimed(struct nfs_client *clp) |
1da177e4 | 632 | { |
8383e460 | 633 | struct nfs_delegation *delegation; |
d3978bb3 | 634 | struct nfs_server *server; |
86e89489 | 635 | struct inode *inode; |
d3978bb3 | 636 | |
8383e460 TM |
637 | restart: |
638 | rcu_read_lock(); | |
d3978bb3 CL |
639 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { |
640 | list_for_each_entry_rcu(delegation, &server->delegations, | |
641 | super_list) { | |
642 | if (test_bit(NFS_DELEGATION_NEED_RECLAIM, | |
643 | &delegation->flags) == 0) | |
644 | continue; | |
645 | inode = nfs_delegation_grab_inode(delegation); | |
646 | if (inode == NULL) | |
647 | continue; | |
648 | delegation = nfs_detach_delegation(NFS_I(inode), | |
649 | server); | |
650 | rcu_read_unlock(); | |
651 | ||
652 | if (delegation != NULL) | |
653 | nfs_free_delegation(delegation); | |
654 | iput(inode); | |
655 | goto restart; | |
656 | } | |
1da177e4 | 657 | } |
8383e460 | 658 | rcu_read_unlock(); |
1da177e4 | 659 | } |
3e4f6290 | 660 | |
d3978bb3 CL |
661 | /** |
662 | * nfs_delegations_present - check for existence of delegations | |
663 | * @clp: client state handle | |
664 | * | |
665 | * Returns one if there are any nfs_delegation structures attached | |
666 | * to this nfs_client. | |
667 | */ | |
668 | int nfs_delegations_present(struct nfs_client *clp) | |
669 | { | |
670 | struct nfs_server *server; | |
671 | int ret = 0; | |
672 | ||
673 | rcu_read_lock(); | |
674 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
675 | if (!list_empty(&server->delegations)) { | |
676 | ret = 1; | |
677 | break; | |
678 | } | |
679 | rcu_read_unlock(); | |
680 | return ret; | |
681 | } | |
682 | ||
683 | /** | |
684 | * nfs4_copy_delegation_stateid - Copy inode's state ID information | |
685 | * @dst: stateid data structure to fill in | |
686 | * @inode: inode to check | |
687 | * | |
688 | * Returns one and fills in "dst->data" * if inode had a delegation, | |
689 | * otherwise zero is returned. | |
690 | */ | |
3e4f6290 TM |
691 | int nfs4_copy_delegation_stateid(nfs4_stateid *dst, struct inode *inode) |
692 | { | |
3e4f6290 TM |
693 | struct nfs_inode *nfsi = NFS_I(inode); |
694 | struct nfs_delegation *delegation; | |
8383e460 | 695 | int ret = 0; |
3e4f6290 | 696 | |
8383e460 TM |
697 | rcu_read_lock(); |
698 | delegation = rcu_dereference(nfsi->delegation); | |
3e4f6290 TM |
699 | if (delegation != NULL) { |
700 | memcpy(dst->data, delegation->stateid.data, sizeof(dst->data)); | |
8383e460 | 701 | ret = 1; |
3e4f6290 | 702 | } |
8383e460 TM |
703 | rcu_read_unlock(); |
704 | return ret; | |
3e4f6290 | 705 | } |