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> |
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; | |
f597c537 | 108 | if (!nfs4_stateid_match(&state->stateid, stateid)) |
90163027 | 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) { | |
f597c537 | 142 | nfs4_stateid_copy(&delegation->stateid, &res->delegation); |
8f649c37 TM |
143 | delegation->type = res->delegation_type; |
144 | delegation->maxsize = res->maxsize; | |
145 | oldcred = delegation->cred; | |
146 | delegation->cred = get_rpccred(cred); | |
147 | clear_bit(NFS_DELEGATION_NEED_RECLAIM, | |
148 | &delegation->flags); | |
149 | NFS_I(inode)->delegation_state = delegation->type; | |
150 | spin_unlock(&delegation->lock); | |
151 | put_rpccred(oldcred); | |
152 | rcu_read_unlock(); | |
153 | } else { | |
154 | /* We appear to have raced with a delegation return. */ | |
155 | spin_unlock(&delegation->lock); | |
156 | rcu_read_unlock(); | |
157 | nfs_inode_set_delegation(inode, cred, res); | |
158 | } | |
159 | } else { | |
160 | rcu_read_unlock(); | |
161 | } | |
1da177e4 LT |
162 | } |
163 | ||
57bfa891 TM |
164 | static int nfs_do_return_delegation(struct inode *inode, struct nfs_delegation *delegation, int issync) |
165 | { | |
166 | int res = 0; | |
167 | ||
168 | res = nfs4_proc_delegreturn(inode, delegation->cred, &delegation->stateid, issync); | |
169 | nfs_free_delegation(delegation); | |
170 | return res; | |
171 | } | |
172 | ||
86e89489 TM |
173 | static struct inode *nfs_delegation_grab_inode(struct nfs_delegation *delegation) |
174 | { | |
175 | struct inode *inode = NULL; | |
176 | ||
177 | spin_lock(&delegation->lock); | |
178 | if (delegation->inode != NULL) | |
179 | inode = igrab(delegation->inode); | |
180 | spin_unlock(&delegation->lock); | |
181 | return inode; | |
182 | } | |
183 | ||
dda4b225 CL |
184 | static struct nfs_delegation * |
185 | nfs_detach_delegation_locked(struct nfs_inode *nfsi, | |
d3978bb3 | 186 | struct nfs_server *server) |
57bfa891 | 187 | { |
17d2c0a0 DH |
188 | struct nfs_delegation *delegation = |
189 | rcu_dereference_protected(nfsi->delegation, | |
d3978bb3 | 190 | lockdep_is_held(&server->nfs_client->cl_lock)); |
57bfa891 TM |
191 | |
192 | if (delegation == NULL) | |
193 | goto nomatch; | |
dda4b225 | 194 | |
34310430 | 195 | spin_lock(&delegation->lock); |
57bfa891 | 196 | list_del_rcu(&delegation->super_list); |
86e89489 | 197 | delegation->inode = NULL; |
57bfa891 TM |
198 | nfsi->delegation_state = 0; |
199 | rcu_assign_pointer(nfsi->delegation, NULL); | |
34310430 | 200 | spin_unlock(&delegation->lock); |
57bfa891 TM |
201 | return delegation; |
202 | nomatch: | |
203 | return NULL; | |
204 | } | |
205 | ||
dda4b225 | 206 | static struct nfs_delegation *nfs_detach_delegation(struct nfs_inode *nfsi, |
d3978bb3 | 207 | struct nfs_server *server) |
dda4b225 | 208 | { |
d3978bb3 | 209 | struct nfs_client *clp = server->nfs_client; |
dda4b225 CL |
210 | struct nfs_delegation *delegation; |
211 | ||
212 | spin_lock(&clp->cl_lock); | |
d3978bb3 | 213 | delegation = nfs_detach_delegation_locked(nfsi, server); |
dda4b225 CL |
214 | spin_unlock(&clp->cl_lock); |
215 | return delegation; | |
216 | } | |
217 | ||
d3978bb3 CL |
218 | /** |
219 | * nfs_inode_set_delegation - set up a delegation on an inode | |
220 | * @inode: inode to which delegation applies | |
221 | * @cred: cred to use for subsequent delegation processing | |
222 | * @res: new delegation state from server | |
223 | * | |
224 | * Returns zero on success, or a negative errno value. | |
1da177e4 LT |
225 | */ |
226 | int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res) | |
227 | { | |
d3978bb3 CL |
228 | struct nfs_server *server = NFS_SERVER(inode); |
229 | struct nfs_client *clp = server->nfs_client; | |
1da177e4 | 230 | struct nfs_inode *nfsi = NFS_I(inode); |
17d2c0a0 | 231 | struct nfs_delegation *delegation, *old_delegation; |
57bfa891 | 232 | struct nfs_delegation *freeme = NULL; |
1da177e4 LT |
233 | int status = 0; |
234 | ||
8535b2be | 235 | delegation = kmalloc(sizeof(*delegation), GFP_NOFS); |
1da177e4 LT |
236 | if (delegation == NULL) |
237 | return -ENOMEM; | |
f597c537 | 238 | nfs4_stateid_copy(&delegation->stateid, &res->delegation); |
1da177e4 LT |
239 | delegation->type = res->delegation_type; |
240 | delegation->maxsize = res->maxsize; | |
a9a4a87a | 241 | delegation->change_attr = inode->i_version; |
1da177e4 LT |
242 | delegation->cred = get_rpccred(cred); |
243 | delegation->inode = inode; | |
b7391f44 | 244 | delegation->flags = 1<<NFS_DELEGATION_REFERENCED; |
34310430 | 245 | spin_lock_init(&delegation->lock); |
1da177e4 LT |
246 | |
247 | spin_lock(&clp->cl_lock); | |
17d2c0a0 | 248 | old_delegation = rcu_dereference_protected(nfsi->delegation, |
d3978bb3 | 249 | lockdep_is_held(&clp->cl_lock)); |
17d2c0a0 | 250 | if (old_delegation != NULL) { |
f597c537 TM |
251 | if (nfs4_stateid_match(&delegation->stateid, |
252 | &old_delegation->stateid) && | |
17d2c0a0 | 253 | delegation->type == old_delegation->type) { |
57bfa891 | 254 | goto out; |
1da177e4 | 255 | } |
57bfa891 TM |
256 | /* |
257 | * Deal with broken servers that hand out two | |
258 | * delegations for the same file. | |
259 | */ | |
260 | dfprintk(FILE, "%s: server %s handed out " | |
261 | "a duplicate delegation!\n", | |
3110ff80 | 262 | __func__, clp->cl_hostname); |
17d2c0a0 | 263 | if (delegation->type <= old_delegation->type) { |
57bfa891 TM |
264 | freeme = delegation; |
265 | delegation = NULL; | |
266 | goto out; | |
267 | } | |
d3978bb3 | 268 | freeme = nfs_detach_delegation_locked(nfsi, server); |
1da177e4 | 269 | } |
d3978bb3 | 270 | list_add_rcu(&delegation->super_list, &server->delegations); |
57bfa891 TM |
271 | nfsi->delegation_state = delegation->type; |
272 | rcu_assign_pointer(nfsi->delegation, delegation); | |
273 | delegation = NULL; | |
412c77ce TM |
274 | |
275 | /* Ensure we revalidate the attributes and page cache! */ | |
276 | spin_lock(&inode->i_lock); | |
277 | nfsi->cache_validity |= NFS_INO_REVAL_FORCED; | |
278 | spin_unlock(&inode->i_lock); | |
279 | ||
57bfa891 | 280 | out: |
1da177e4 | 281 | spin_unlock(&clp->cl_lock); |
603c83da TM |
282 | if (delegation != NULL) |
283 | nfs_free_delegation(delegation); | |
57bfa891 TM |
284 | if (freeme != NULL) |
285 | nfs_do_return_delegation(inode, freeme, 0); | |
1da177e4 LT |
286 | return status; |
287 | } | |
288 | ||
1da177e4 LT |
289 | /* |
290 | * Basic procedure for returning a delegation to the server | |
291 | */ | |
d18cc1fd | 292 | static int __nfs_inode_return_delegation(struct inode *inode, struct nfs_delegation *delegation, int issync) |
1da177e4 | 293 | { |
1da177e4 | 294 | struct nfs_inode *nfsi = NFS_I(inode); |
d18cc1fd | 295 | int err; |
1da177e4 | 296 | |
3f09df70 TM |
297 | /* |
298 | * Guard against new delegated open/lock/unlock calls and against | |
299 | * state recovery | |
300 | */ | |
1da177e4 | 301 | down_write(&nfsi->rwsem); |
d18cc1fd | 302 | err = nfs_delegation_claim_opens(inode, &delegation->stateid); |
1da177e4 | 303 | up_write(&nfsi->rwsem); |
d18cc1fd TM |
304 | if (err) |
305 | goto out; | |
1da177e4 | 306 | |
d18cc1fd TM |
307 | err = nfs_do_return_delegation(inode, delegation, issync); |
308 | out: | |
309 | return err; | |
90163027 TM |
310 | } |
311 | ||
d3978bb3 CL |
312 | /** |
313 | * nfs_client_return_marked_delegations - return previously marked delegations | |
314 | * @clp: nfs_client to process | |
315 | * | |
316 | * Returns zero on success, or a negative errno value. | |
515d8611 | 317 | */ |
d18cc1fd | 318 | int nfs_client_return_marked_delegations(struct nfs_client *clp) |
515d8611 TM |
319 | { |
320 | struct nfs_delegation *delegation; | |
d3978bb3 | 321 | struct nfs_server *server; |
515d8611 | 322 | struct inode *inode; |
d18cc1fd | 323 | int err = 0; |
515d8611 TM |
324 | |
325 | restart: | |
326 | rcu_read_lock(); | |
d3978bb3 CL |
327 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { |
328 | list_for_each_entry_rcu(delegation, &server->delegations, | |
329 | super_list) { | |
330 | if (!test_and_clear_bit(NFS_DELEGATION_RETURN, | |
331 | &delegation->flags)) | |
332 | continue; | |
333 | inode = nfs_delegation_grab_inode(delegation); | |
334 | if (inode == NULL) | |
335 | continue; | |
336 | delegation = nfs_detach_delegation(NFS_I(inode), | |
337 | server); | |
338 | rcu_read_unlock(); | |
339 | ||
340 | if (delegation != NULL) { | |
341 | filemap_flush(inode->i_mapping); | |
342 | err = __nfs_inode_return_delegation(inode, | |
343 | delegation, 0); | |
344 | } | |
345 | iput(inode); | |
346 | if (!err) | |
347 | goto restart; | |
348 | set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state); | |
349 | return err; | |
d18cc1fd | 350 | } |
515d8611 TM |
351 | } |
352 | rcu_read_unlock(); | |
d18cc1fd | 353 | return 0; |
515d8611 TM |
354 | } |
355 | ||
d3978bb3 CL |
356 | /** |
357 | * nfs_inode_return_delegation_noreclaim - return delegation, don't reclaim opens | |
358 | * @inode: inode to process | |
359 | * | |
360 | * Does not protect against delegation reclaims, therefore really only safe | |
361 | * to be called from nfs4_clear_inode(). | |
e6f81075 TM |
362 | */ |
363 | void nfs_inode_return_delegation_noreclaim(struct inode *inode) | |
364 | { | |
d3978bb3 | 365 | struct nfs_server *server = NFS_SERVER(inode); |
e6f81075 TM |
366 | struct nfs_inode *nfsi = NFS_I(inode); |
367 | struct nfs_delegation *delegation; | |
368 | ||
17d2c0a0 | 369 | if (rcu_access_pointer(nfsi->delegation) != NULL) { |
d3978bb3 | 370 | delegation = nfs_detach_delegation(nfsi, server); |
e6f81075 TM |
371 | if (delegation != NULL) |
372 | nfs_do_return_delegation(inode, delegation, 0); | |
373 | } | |
374 | } | |
375 | ||
d3978bb3 CL |
376 | /** |
377 | * nfs_inode_return_delegation - synchronously return a delegation | |
378 | * @inode: inode to process | |
379 | * | |
380 | * Returns zero on success, or a negative errno value. | |
381 | */ | |
90163027 TM |
382 | int nfs_inode_return_delegation(struct inode *inode) |
383 | { | |
d3978bb3 | 384 | struct nfs_server *server = NFS_SERVER(inode); |
90163027 TM |
385 | struct nfs_inode *nfsi = NFS_I(inode); |
386 | struct nfs_delegation *delegation; | |
387 | int err = 0; | |
388 | ||
17d2c0a0 | 389 | if (rcu_access_pointer(nfsi->delegation) != NULL) { |
d3978bb3 | 390 | delegation = nfs_detach_delegation(nfsi, server); |
d18cc1fd | 391 | if (delegation != NULL) { |
1b924e5f | 392 | nfs_wb_all(inode); |
d18cc1fd TM |
393 | err = __nfs_inode_return_delegation(inode, delegation, 1); |
394 | } | |
90163027 TM |
395 | } |
396 | return err; | |
1da177e4 LT |
397 | } |
398 | ||
ed1e6211 TM |
399 | static void nfs_mark_return_delegation(struct nfs_server *server, |
400 | struct nfs_delegation *delegation) | |
6411bd4a TM |
401 | { |
402 | set_bit(NFS_DELEGATION_RETURN, &delegation->flags); | |
ed1e6211 | 403 | set_bit(NFS4CLNT_DELEGRETURN, &server->nfs_client->cl_state); |
6411bd4a TM |
404 | } |
405 | ||
d3978bb3 CL |
406 | /** |
407 | * nfs_super_return_all_delegations - return delegations for one superblock | |
408 | * @sb: sb to process | |
409 | * | |
1da177e4 | 410 | */ |
515d8611 | 411 | void nfs_super_return_all_delegations(struct super_block *sb) |
1da177e4 | 412 | { |
d3978bb3 CL |
413 | struct nfs_server *server = NFS_SB(sb); |
414 | struct nfs_client *clp = server->nfs_client; | |
1da177e4 | 415 | struct nfs_delegation *delegation; |
1da177e4 LT |
416 | |
417 | if (clp == NULL) | |
418 | return; | |
d3978bb3 | 419 | |
8383e460 | 420 | rcu_read_lock(); |
d3978bb3 | 421 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { |
86e89489 | 422 | spin_lock(&delegation->lock); |
d3978bb3 | 423 | set_bit(NFS_DELEGATION_RETURN, &delegation->flags); |
86e89489 | 424 | spin_unlock(&delegation->lock); |
1da177e4 | 425 | } |
8383e460 | 426 | rcu_read_unlock(); |
d3978bb3 | 427 | |
d18cc1fd TM |
428 | if (nfs_client_return_marked_delegations(clp) != 0) |
429 | nfs4_schedule_state_manager(clp); | |
515d8611 TM |
430 | } |
431 | ||
d3978bb3 CL |
432 | static void nfs_mark_return_all_delegation_types(struct nfs_server *server, |
433 | fmode_t flags) | |
515d8611 TM |
434 | { |
435 | struct nfs_delegation *delegation; | |
436 | ||
d3978bb3 | 437 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { |
c79571a5 AB |
438 | if ((delegation->type == (FMODE_READ|FMODE_WRITE)) && !(flags & FMODE_WRITE)) |
439 | continue; | |
440 | if (delegation->type & flags) | |
ed1e6211 | 441 | nfs_mark_return_delegation(server, delegation); |
707fb4b3 | 442 | } |
d3978bb3 CL |
443 | } |
444 | ||
445 | static void nfs_client_mark_return_all_delegation_types(struct nfs_client *clp, | |
446 | fmode_t flags) | |
447 | { | |
448 | struct nfs_server *server; | |
449 | ||
450 | rcu_read_lock(); | |
451 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
452 | nfs_mark_return_all_delegation_types(server, flags); | |
515d8611 | 453 | rcu_read_unlock(); |
1da177e4 LT |
454 | } |
455 | ||
c79571a5 AB |
456 | static void nfs_client_mark_return_all_delegations(struct nfs_client *clp) |
457 | { | |
458 | nfs_client_mark_return_all_delegation_types(clp, FMODE_READ|FMODE_WRITE); | |
459 | } | |
460 | ||
b0d3ded1 | 461 | static void nfs_delegation_run_state_manager(struct nfs_client *clp) |
58d9714a | 462 | { |
b0d3ded1 TM |
463 | if (test_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) |
464 | nfs4_schedule_state_manager(clp); | |
58d9714a TM |
465 | } |
466 | ||
a1d0b5ee TM |
467 | void nfs_remove_bad_delegation(struct inode *inode) |
468 | { | |
469 | struct nfs_delegation *delegation; | |
470 | ||
471 | delegation = nfs_detach_delegation(NFS_I(inode), NFS_SERVER(inode)); | |
472 | if (delegation) { | |
473 | nfs_inode_find_state_and_recover(inode, &delegation->stateid); | |
474 | nfs_free_delegation(delegation); | |
475 | } | |
476 | } | |
477 | ||
d3978bb3 CL |
478 | /** |
479 | * nfs_expire_all_delegation_types | |
480 | * @clp: client to process | |
481 | * @flags: delegation types to expire | |
482 | * | |
483 | */ | |
31f09607 | 484 | void nfs_expire_all_delegation_types(struct nfs_client *clp, fmode_t flags) |
58d9714a | 485 | { |
c79571a5 | 486 | nfs_client_mark_return_all_delegation_types(clp, flags); |
b0d3ded1 | 487 | nfs_delegation_run_state_manager(clp); |
58d9714a TM |
488 | } |
489 | ||
d3978bb3 CL |
490 | /** |
491 | * nfs_expire_all_delegations | |
492 | * @clp: client to process | |
493 | * | |
494 | */ | |
c79571a5 AB |
495 | void nfs_expire_all_delegations(struct nfs_client *clp) |
496 | { | |
497 | nfs_expire_all_delegation_types(clp, FMODE_READ|FMODE_WRITE); | |
498 | } | |
499 | ||
d3978bb3 CL |
500 | /** |
501 | * nfs_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN | |
502 | * @clp: client to process | |
503 | * | |
1da177e4 | 504 | */ |
adfa6f98 | 505 | void nfs_handle_cb_pathdown(struct nfs_client *clp) |
1da177e4 | 506 | { |
1da177e4 LT |
507 | if (clp == NULL) |
508 | return; | |
707fb4b3 | 509 | nfs_client_mark_return_all_delegations(clp); |
1da177e4 LT |
510 | } |
511 | ||
d3978bb3 | 512 | static void nfs_mark_return_unreferenced_delegations(struct nfs_server *server) |
b7391f44 TM |
513 | { |
514 | struct nfs_delegation *delegation; | |
515 | ||
d3978bb3 | 516 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { |
b7391f44 TM |
517 | if (test_and_clear_bit(NFS_DELEGATION_REFERENCED, &delegation->flags)) |
518 | continue; | |
ed1e6211 | 519 | nfs_mark_return_delegation(server, delegation); |
b7391f44 | 520 | } |
b7391f44 TM |
521 | } |
522 | ||
d3978bb3 CL |
523 | /** |
524 | * nfs_expire_unreferenced_delegations - Eliminate unused delegations | |
525 | * @clp: nfs_client to process | |
526 | * | |
527 | */ | |
b7391f44 TM |
528 | void nfs_expire_unreferenced_delegations(struct nfs_client *clp) |
529 | { | |
d3978bb3 CL |
530 | struct nfs_server *server; |
531 | ||
532 | rcu_read_lock(); | |
533 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
534 | nfs_mark_return_unreferenced_delegations(server); | |
535 | rcu_read_unlock(); | |
536 | ||
b7391f44 TM |
537 | nfs_delegation_run_state_manager(clp); |
538 | } | |
539 | ||
d3978bb3 CL |
540 | /** |
541 | * nfs_async_inode_return_delegation - asynchronously return a delegation | |
542 | * @inode: inode to process | |
8e663f0e | 543 | * @stateid: state ID information |
d3978bb3 CL |
544 | * |
545 | * Returns zero on success, or a negative errno value. | |
1da177e4 | 546 | */ |
d3978bb3 CL |
547 | int nfs_async_inode_return_delegation(struct inode *inode, |
548 | const nfs4_stateid *stateid) | |
1da177e4 | 549 | { |
ed1e6211 TM |
550 | struct nfs_server *server = NFS_SERVER(inode); |
551 | struct nfs_client *clp = server->nfs_client; | |
6411bd4a | 552 | struct nfs_delegation *delegation; |
1da177e4 | 553 | |
6411bd4a TM |
554 | rcu_read_lock(); |
555 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
2597641d | 556 | |
36281caa | 557 | if (!clp->cl_mvops->match_stateid(&delegation->stateid, stateid)) { |
6411bd4a TM |
558 | rcu_read_unlock(); |
559 | return -ENOENT; | |
560 | } | |
ed1e6211 | 561 | nfs_mark_return_delegation(server, delegation); |
6411bd4a | 562 | rcu_read_unlock(); |
d3978bb3 | 563 | |
6411bd4a TM |
564 | nfs_delegation_run_state_manager(clp); |
565 | return 0; | |
1da177e4 LT |
566 | } |
567 | ||
d3978bb3 CL |
568 | static struct inode * |
569 | nfs_delegation_find_inode_server(struct nfs_server *server, | |
570 | const struct nfs_fh *fhandle) | |
1da177e4 LT |
571 | { |
572 | struct nfs_delegation *delegation; | |
573 | struct inode *res = NULL; | |
d3978bb3 CL |
574 | |
575 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { | |
86e89489 TM |
576 | spin_lock(&delegation->lock); |
577 | if (delegation->inode != NULL && | |
578 | nfs_compare_fh(fhandle, &NFS_I(delegation->inode)->fh) == 0) { | |
1da177e4 | 579 | res = igrab(delegation->inode); |
1da177e4 | 580 | } |
86e89489 TM |
581 | spin_unlock(&delegation->lock); |
582 | if (res != NULL) | |
583 | break; | |
1da177e4 | 584 | } |
d3978bb3 CL |
585 | return res; |
586 | } | |
587 | ||
588 | /** | |
589 | * nfs_delegation_find_inode - retrieve the inode associated with a delegation | |
590 | * @clp: client state handle | |
591 | * @fhandle: filehandle from a delegation recall | |
592 | * | |
593 | * Returns pointer to inode matching "fhandle," or NULL if a matching inode | |
594 | * cannot be found. | |
595 | */ | |
596 | struct inode *nfs_delegation_find_inode(struct nfs_client *clp, | |
597 | const struct nfs_fh *fhandle) | |
598 | { | |
599 | struct nfs_server *server; | |
600 | struct inode *res = NULL; | |
601 | ||
602 | rcu_read_lock(); | |
603 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { | |
604 | res = nfs_delegation_find_inode_server(server, fhandle); | |
605 | if (res != NULL) | |
606 | break; | |
607 | } | |
8383e460 | 608 | rcu_read_unlock(); |
1da177e4 LT |
609 | return res; |
610 | } | |
611 | ||
d3978bb3 CL |
612 | static void nfs_delegation_mark_reclaim_server(struct nfs_server *server) |
613 | { | |
614 | struct nfs_delegation *delegation; | |
615 | ||
616 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) | |
617 | set_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags); | |
618 | } | |
619 | ||
620 | /** | |
621 | * nfs_delegation_mark_reclaim - mark all delegations as needing to be reclaimed | |
622 | * @clp: nfs_client to process | |
623 | * | |
1da177e4 | 624 | */ |
adfa6f98 | 625 | void nfs_delegation_mark_reclaim(struct nfs_client *clp) |
1da177e4 | 626 | { |
d3978bb3 CL |
627 | struct nfs_server *server; |
628 | ||
8383e460 | 629 | rcu_read_lock(); |
d3978bb3 CL |
630 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) |
631 | nfs_delegation_mark_reclaim_server(server); | |
8383e460 | 632 | rcu_read_unlock(); |
1da177e4 LT |
633 | } |
634 | ||
d3978bb3 CL |
635 | /** |
636 | * nfs_delegation_reap_unclaimed - reap unclaimed delegations after reboot recovery is done | |
637 | * @clp: nfs_client to process | |
638 | * | |
1da177e4 | 639 | */ |
adfa6f98 | 640 | void nfs_delegation_reap_unclaimed(struct nfs_client *clp) |
1da177e4 | 641 | { |
8383e460 | 642 | struct nfs_delegation *delegation; |
d3978bb3 | 643 | struct nfs_server *server; |
86e89489 | 644 | struct inode *inode; |
d3978bb3 | 645 | |
8383e460 TM |
646 | restart: |
647 | rcu_read_lock(); | |
d3978bb3 CL |
648 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { |
649 | list_for_each_entry_rcu(delegation, &server->delegations, | |
650 | super_list) { | |
651 | if (test_bit(NFS_DELEGATION_NEED_RECLAIM, | |
652 | &delegation->flags) == 0) | |
653 | continue; | |
654 | inode = nfs_delegation_grab_inode(delegation); | |
655 | if (inode == NULL) | |
656 | continue; | |
657 | delegation = nfs_detach_delegation(NFS_I(inode), | |
658 | server); | |
659 | rcu_read_unlock(); | |
660 | ||
661 | if (delegation != NULL) | |
662 | nfs_free_delegation(delegation); | |
663 | iput(inode); | |
664 | goto restart; | |
665 | } | |
1da177e4 | 666 | } |
8383e460 | 667 | rcu_read_unlock(); |
1da177e4 | 668 | } |
3e4f6290 | 669 | |
d3978bb3 CL |
670 | /** |
671 | * nfs_delegations_present - check for existence of delegations | |
672 | * @clp: client state handle | |
673 | * | |
674 | * Returns one if there are any nfs_delegation structures attached | |
675 | * to this nfs_client. | |
676 | */ | |
677 | int nfs_delegations_present(struct nfs_client *clp) | |
678 | { | |
679 | struct nfs_server *server; | |
680 | int ret = 0; | |
681 | ||
682 | rcu_read_lock(); | |
683 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
684 | if (!list_empty(&server->delegations)) { | |
685 | ret = 1; | |
686 | break; | |
687 | } | |
688 | rcu_read_unlock(); | |
689 | return ret; | |
690 | } | |
691 | ||
692 | /** | |
693 | * nfs4_copy_delegation_stateid - Copy inode's state ID information | |
694 | * @dst: stateid data structure to fill in | |
695 | * @inode: inode to check | |
696 | * | |
697 | * Returns one and fills in "dst->data" * if inode had a delegation, | |
698 | * otherwise zero is returned. | |
699 | */ | |
3e4f6290 TM |
700 | int nfs4_copy_delegation_stateid(nfs4_stateid *dst, struct inode *inode) |
701 | { | |
3e4f6290 TM |
702 | struct nfs_inode *nfsi = NFS_I(inode); |
703 | struct nfs_delegation *delegation; | |
8383e460 | 704 | int ret = 0; |
3e4f6290 | 705 | |
8383e460 TM |
706 | rcu_read_lock(); |
707 | delegation = rcu_dereference(nfsi->delegation); | |
3e4f6290 | 708 | if (delegation != NULL) { |
f597c537 | 709 | nfs4_stateid_copy(dst, &delegation->stateid); |
8383e460 | 710 | ret = 1; |
3e4f6290 | 711 | } |
8383e460 TM |
712 | rcu_read_unlock(); |
713 | return ret; | |
3e4f6290 | 714 | } |