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" |
ca8acf8d | 23 | #include "nfs4trace.h" |
1da177e4 | 24 | |
905f8d16 TM |
25 | static void nfs_free_delegation(struct nfs_delegation *delegation) |
26 | { | |
e00b8a24 TM |
27 | if (delegation->cred) { |
28 | put_rpccred(delegation->cred); | |
29 | delegation->cred = NULL; | |
30 | } | |
26f04dde | 31 | kfree_rcu(delegation, rcu); |
8383e460 TM |
32 | } |
33 | ||
d3978bb3 CL |
34 | /** |
35 | * nfs_mark_delegation_referenced - set delegation's REFERENCED flag | |
36 | * @delegation: delegation to process | |
37 | * | |
38 | */ | |
b7391f44 TM |
39 | void nfs_mark_delegation_referenced(struct nfs_delegation *delegation) |
40 | { | |
41 | set_bit(NFS_DELEGATION_REFERENCED, &delegation->flags); | |
42 | } | |
43 | ||
15bb3afe PT |
44 | static int |
45 | nfs4_do_check_delegation(struct inode *inode, fmode_t flags, bool mark) | |
b7391f44 TM |
46 | { |
47 | struct nfs_delegation *delegation; | |
48 | int ret = 0; | |
49 | ||
50 | flags &= FMODE_READ|FMODE_WRITE; | |
51 | rcu_read_lock(); | |
52 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
d25be546 TM |
53 | if (delegation != NULL && (delegation->type & flags) == flags && |
54 | !test_bit(NFS_DELEGATION_RETURNING, &delegation->flags)) { | |
15bb3afe PT |
55 | if (mark) |
56 | nfs_mark_delegation_referenced(delegation); | |
b7391f44 TM |
57 | ret = 1; |
58 | } | |
59 | rcu_read_unlock(); | |
60 | return ret; | |
61 | } | |
15bb3afe PT |
62 | /** |
63 | * nfs_have_delegation - check if inode has a delegation, mark it | |
64 | * NFS_DELEGATION_REFERENCED if there is one. | |
65 | * @inode: inode to check | |
66 | * @flags: delegation types to check for | |
67 | * | |
68 | * Returns one if inode has the indicated delegation, otherwise zero. | |
69 | */ | |
70 | int nfs4_have_delegation(struct inode *inode, fmode_t flags) | |
71 | { | |
72 | return nfs4_do_check_delegation(inode, flags, true); | |
73 | } | |
74 | ||
75 | /* | |
76 | * nfs4_check_delegation - check if inode has a delegation, do not mark | |
77 | * NFS_DELEGATION_REFERENCED if it has one. | |
78 | */ | |
79 | int nfs4_check_delegation(struct inode *inode, fmode_t flags) | |
80 | { | |
81 | return nfs4_do_check_delegation(inode, flags, false); | |
82 | } | |
b7391f44 | 83 | |
db4f2e63 | 84 | static int nfs_delegation_claim_locks(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid) |
888e694c TM |
85 | { |
86 | struct inode *inode = state->inode; | |
87 | struct file_lock *fl; | |
d5122201 | 88 | int status = 0; |
888e694c | 89 | |
65b62a29 TM |
90 | if (inode->i_flock == NULL) |
91 | goto out; | |
314d7cc0 | 92 | |
1c8c601a JL |
93 | /* Protect inode->i_flock using the i_lock */ |
94 | spin_lock(&inode->i_lock); | |
90dc7d27 | 95 | for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) { |
888e694c TM |
96 | if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK))) |
97 | continue; | |
cd3758e3 | 98 | if (nfs_file_open_context(fl->fl_file) != ctx) |
888e694c | 99 | continue; |
1c8c601a | 100 | spin_unlock(&inode->i_lock); |
db4f2e63 | 101 | status = nfs4_lock_delegation_recall(fl, state, stateid); |
d5122201 | 102 | if (status < 0) |
3f09df70 | 103 | goto out; |
1c8c601a | 104 | spin_lock(&inode->i_lock); |
888e694c | 105 | } |
1c8c601a | 106 | spin_unlock(&inode->i_lock); |
3f09df70 | 107 | out: |
888e694c TM |
108 | return status; |
109 | } | |
110 | ||
d18cc1fd | 111 | static int nfs_delegation_claim_opens(struct inode *inode, const nfs4_stateid *stateid) |
1da177e4 LT |
112 | { |
113 | struct nfs_inode *nfsi = NFS_I(inode); | |
114 | struct nfs_open_context *ctx; | |
d25be546 | 115 | struct nfs4_state_owner *sp; |
1da177e4 | 116 | struct nfs4_state *state; |
d25be546 | 117 | unsigned int seq; |
888e694c | 118 | int err; |
1da177e4 LT |
119 | |
120 | again: | |
121 | spin_lock(&inode->i_lock); | |
122 | list_for_each_entry(ctx, &nfsi->open_files, list) { | |
123 | state = ctx->state; | |
124 | if (state == NULL) | |
125 | continue; | |
126 | if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) | |
127 | continue; | |
f8ebf7a8 TM |
128 | if (!nfs4_valid_open_stateid(state)) |
129 | continue; | |
f597c537 | 130 | if (!nfs4_stateid_match(&state->stateid, stateid)) |
90163027 | 131 | continue; |
1da177e4 LT |
132 | get_nfs_open_context(ctx); |
133 | spin_unlock(&inode->i_lock); | |
d25be546 | 134 | sp = state->owner; |
65b62a29 TM |
135 | /* Block nfs4_proc_unlck */ |
136 | mutex_lock(&sp->so_delegreturn_mutex); | |
d25be546 | 137 | seq = raw_seqcount_begin(&sp->so_reclaim_seqcount); |
13437e12 | 138 | err = nfs4_open_delegation_recall(ctx, state, stateid); |
d25be546 | 139 | if (!err) |
db4f2e63 | 140 | err = nfs_delegation_claim_locks(ctx, state, stateid); |
d25be546 TM |
141 | if (!err && read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) |
142 | err = -EAGAIN; | |
65b62a29 | 143 | mutex_unlock(&sp->so_delegreturn_mutex); |
1da177e4 | 144 | put_nfs_open_context(ctx); |
888e694c | 145 | if (err != 0) |
d18cc1fd | 146 | return err; |
1da177e4 LT |
147 | goto again; |
148 | } | |
149 | spin_unlock(&inode->i_lock); | |
d18cc1fd | 150 | return 0; |
1da177e4 LT |
151 | } |
152 | ||
d3978bb3 CL |
153 | /** |
154 | * nfs_inode_reclaim_delegation - process a delegation reclaim request | |
155 | * @inode: inode to process | |
156 | * @cred: credential to use for request | |
157 | * @res: new delegation state from server | |
158 | * | |
1da177e4 | 159 | */ |
d3978bb3 CL |
160 | void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, |
161 | struct nfs_openres *res) | |
1da177e4 | 162 | { |
8f649c37 TM |
163 | struct nfs_delegation *delegation; |
164 | struct rpc_cred *oldcred = NULL; | |
1da177e4 | 165 | |
8f649c37 TM |
166 | rcu_read_lock(); |
167 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
168 | if (delegation != NULL) { | |
169 | spin_lock(&delegation->lock); | |
170 | if (delegation->inode != NULL) { | |
f597c537 | 171 | nfs4_stateid_copy(&delegation->stateid, &res->delegation); |
8f649c37 TM |
172 | delegation->type = res->delegation_type; |
173 | delegation->maxsize = res->maxsize; | |
174 | oldcred = delegation->cred; | |
175 | delegation->cred = get_rpccred(cred); | |
176 | clear_bit(NFS_DELEGATION_NEED_RECLAIM, | |
177 | &delegation->flags); | |
178 | NFS_I(inode)->delegation_state = delegation->type; | |
179 | spin_unlock(&delegation->lock); | |
180 | put_rpccred(oldcred); | |
181 | rcu_read_unlock(); | |
ca8acf8d | 182 | trace_nfs4_reclaim_delegation(inode, res->delegation_type); |
8f649c37 TM |
183 | } else { |
184 | /* We appear to have raced with a delegation return. */ | |
185 | spin_unlock(&delegation->lock); | |
186 | rcu_read_unlock(); | |
187 | nfs_inode_set_delegation(inode, cred, res); | |
188 | } | |
189 | } else { | |
190 | rcu_read_unlock(); | |
191 | } | |
1da177e4 LT |
192 | } |
193 | ||
57bfa891 TM |
194 | static int nfs_do_return_delegation(struct inode *inode, struct nfs_delegation *delegation, int issync) |
195 | { | |
196 | int res = 0; | |
197 | ||
869f9dfa TM |
198 | if (!test_bit(NFS_DELEGATION_REVOKED, &delegation->flags)) |
199 | res = nfs4_proc_delegreturn(inode, | |
200 | delegation->cred, | |
201 | &delegation->stateid, | |
202 | issync); | |
57bfa891 TM |
203 | nfs_free_delegation(delegation); |
204 | return res; | |
205 | } | |
206 | ||
86e89489 TM |
207 | static struct inode *nfs_delegation_grab_inode(struct nfs_delegation *delegation) |
208 | { | |
209 | struct inode *inode = NULL; | |
210 | ||
211 | spin_lock(&delegation->lock); | |
212 | if (delegation->inode != NULL) | |
213 | inode = igrab(delegation->inode); | |
214 | spin_unlock(&delegation->lock); | |
215 | return inode; | |
216 | } | |
217 | ||
d25be546 TM |
218 | static struct nfs_delegation * |
219 | nfs_start_delegation_return_locked(struct nfs_inode *nfsi) | |
220 | { | |
221 | struct nfs_delegation *ret = NULL; | |
222 | struct nfs_delegation *delegation = rcu_dereference(nfsi->delegation); | |
223 | ||
224 | if (delegation == NULL) | |
225 | goto out; | |
226 | spin_lock(&delegation->lock); | |
227 | if (!test_and_set_bit(NFS_DELEGATION_RETURNING, &delegation->flags)) | |
228 | ret = delegation; | |
229 | spin_unlock(&delegation->lock); | |
230 | out: | |
231 | return ret; | |
232 | } | |
233 | ||
234 | static struct nfs_delegation * | |
235 | nfs_start_delegation_return(struct nfs_inode *nfsi) | |
236 | { | |
237 | struct nfs_delegation *delegation; | |
238 | ||
239 | rcu_read_lock(); | |
240 | delegation = nfs_start_delegation_return_locked(nfsi); | |
241 | rcu_read_unlock(); | |
242 | return delegation; | |
243 | } | |
244 | ||
245 | static void | |
246 | nfs_abort_delegation_return(struct nfs_delegation *delegation, | |
247 | struct nfs_client *clp) | |
248 | { | |
249 | ||
250 | spin_lock(&delegation->lock); | |
251 | clear_bit(NFS_DELEGATION_RETURNING, &delegation->flags); | |
252 | set_bit(NFS_DELEGATION_RETURN, &delegation->flags); | |
253 | spin_unlock(&delegation->lock); | |
254 | set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state); | |
255 | } | |
256 | ||
dda4b225 CL |
257 | static struct nfs_delegation * |
258 | nfs_detach_delegation_locked(struct nfs_inode *nfsi, | |
d25be546 TM |
259 | struct nfs_delegation *delegation, |
260 | struct nfs_client *clp) | |
57bfa891 | 261 | { |
d25be546 | 262 | struct nfs_delegation *deleg_cur = |
17d2c0a0 | 263 | rcu_dereference_protected(nfsi->delegation, |
d25be546 | 264 | lockdep_is_held(&clp->cl_lock)); |
57bfa891 | 265 | |
d25be546 TM |
266 | if (deleg_cur == NULL || delegation != deleg_cur) |
267 | return NULL; | |
dda4b225 | 268 | |
34310430 | 269 | spin_lock(&delegation->lock); |
d25be546 | 270 | set_bit(NFS_DELEGATION_RETURNING, &delegation->flags); |
57bfa891 | 271 | list_del_rcu(&delegation->super_list); |
86e89489 | 272 | delegation->inode = NULL; |
57bfa891 TM |
273 | nfsi->delegation_state = 0; |
274 | rcu_assign_pointer(nfsi->delegation, NULL); | |
34310430 | 275 | spin_unlock(&delegation->lock); |
57bfa891 | 276 | return delegation; |
57bfa891 TM |
277 | } |
278 | ||
dda4b225 | 279 | static struct nfs_delegation *nfs_detach_delegation(struct nfs_inode *nfsi, |
d25be546 TM |
280 | struct nfs_delegation *delegation, |
281 | struct nfs_server *server) | |
dda4b225 | 282 | { |
d3978bb3 | 283 | struct nfs_client *clp = server->nfs_client; |
dda4b225 CL |
284 | |
285 | spin_lock(&clp->cl_lock); | |
d25be546 | 286 | delegation = nfs_detach_delegation_locked(nfsi, delegation, clp); |
dda4b225 CL |
287 | spin_unlock(&clp->cl_lock); |
288 | return delegation; | |
289 | } | |
290 | ||
d25be546 TM |
291 | static struct nfs_delegation * |
292 | nfs_inode_detach_delegation(struct inode *inode) | |
293 | { | |
294 | struct nfs_inode *nfsi = NFS_I(inode); | |
295 | struct nfs_server *server = NFS_SERVER(inode); | |
296 | struct nfs_delegation *delegation; | |
297 | ||
298 | delegation = nfs_start_delegation_return(nfsi); | |
299 | if (delegation == NULL) | |
300 | return NULL; | |
301 | return nfs_detach_delegation(nfsi, delegation, server); | |
302 | } | |
303 | ||
d3978bb3 CL |
304 | /** |
305 | * nfs_inode_set_delegation - set up a delegation on an inode | |
306 | * @inode: inode to which delegation applies | |
307 | * @cred: cred to use for subsequent delegation processing | |
308 | * @res: new delegation state from server | |
309 | * | |
310 | * Returns zero on success, or a negative errno value. | |
1da177e4 LT |
311 | */ |
312 | int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res) | |
313 | { | |
d3978bb3 CL |
314 | struct nfs_server *server = NFS_SERVER(inode); |
315 | struct nfs_client *clp = server->nfs_client; | |
1da177e4 | 316 | struct nfs_inode *nfsi = NFS_I(inode); |
17d2c0a0 | 317 | struct nfs_delegation *delegation, *old_delegation; |
57bfa891 | 318 | struct nfs_delegation *freeme = NULL; |
1da177e4 LT |
319 | int status = 0; |
320 | ||
8535b2be | 321 | delegation = kmalloc(sizeof(*delegation), GFP_NOFS); |
1da177e4 LT |
322 | if (delegation == NULL) |
323 | return -ENOMEM; | |
f597c537 | 324 | nfs4_stateid_copy(&delegation->stateid, &res->delegation); |
1da177e4 LT |
325 | delegation->type = res->delegation_type; |
326 | delegation->maxsize = res->maxsize; | |
a9a4a87a | 327 | delegation->change_attr = inode->i_version; |
1da177e4 LT |
328 | delegation->cred = get_rpccred(cred); |
329 | delegation->inode = inode; | |
b7391f44 | 330 | delegation->flags = 1<<NFS_DELEGATION_REFERENCED; |
34310430 | 331 | spin_lock_init(&delegation->lock); |
1da177e4 LT |
332 | |
333 | spin_lock(&clp->cl_lock); | |
17d2c0a0 | 334 | old_delegation = rcu_dereference_protected(nfsi->delegation, |
d3978bb3 | 335 | lockdep_is_held(&clp->cl_lock)); |
17d2c0a0 | 336 | if (old_delegation != NULL) { |
f597c537 TM |
337 | if (nfs4_stateid_match(&delegation->stateid, |
338 | &old_delegation->stateid) && | |
17d2c0a0 | 339 | delegation->type == old_delegation->type) { |
57bfa891 | 340 | goto out; |
1da177e4 | 341 | } |
57bfa891 TM |
342 | /* |
343 | * Deal with broken servers that hand out two | |
344 | * delegations for the same file. | |
17280175 TM |
345 | * Allow for upgrades to a WRITE delegation, but |
346 | * nothing else. | |
57bfa891 TM |
347 | */ |
348 | dfprintk(FILE, "%s: server %s handed out " | |
349 | "a duplicate delegation!\n", | |
3110ff80 | 350 | __func__, clp->cl_hostname); |
17280175 TM |
351 | if (delegation->type == old_delegation->type || |
352 | !(delegation->type & FMODE_WRITE)) { | |
57bfa891 TM |
353 | freeme = delegation; |
354 | delegation = NULL; | |
355 | goto out; | |
356 | } | |
d25be546 TM |
357 | freeme = nfs_detach_delegation_locked(nfsi, |
358 | old_delegation, clp); | |
359 | if (freeme == NULL) | |
360 | goto out; | |
1da177e4 | 361 | } |
d3978bb3 | 362 | list_add_rcu(&delegation->super_list, &server->delegations); |
57bfa891 TM |
363 | nfsi->delegation_state = delegation->type; |
364 | rcu_assign_pointer(nfsi->delegation, delegation); | |
365 | delegation = NULL; | |
412c77ce TM |
366 | |
367 | /* Ensure we revalidate the attributes and page cache! */ | |
368 | spin_lock(&inode->i_lock); | |
369 | nfsi->cache_validity |= NFS_INO_REVAL_FORCED; | |
370 | spin_unlock(&inode->i_lock); | |
ca8acf8d | 371 | trace_nfs4_set_delegation(inode, res->delegation_type); |
412c77ce | 372 | |
57bfa891 | 373 | out: |
1da177e4 | 374 | spin_unlock(&clp->cl_lock); |
603c83da TM |
375 | if (delegation != NULL) |
376 | nfs_free_delegation(delegation); | |
57bfa891 TM |
377 | if (freeme != NULL) |
378 | nfs_do_return_delegation(inode, freeme, 0); | |
1da177e4 LT |
379 | return status; |
380 | } | |
381 | ||
1da177e4 LT |
382 | /* |
383 | * Basic procedure for returning a delegation to the server | |
384 | */ | |
d25be546 | 385 | static int nfs_end_delegation_return(struct inode *inode, struct nfs_delegation *delegation, int issync) |
1da177e4 | 386 | { |
d25be546 | 387 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; |
1da177e4 | 388 | struct nfs_inode *nfsi = NFS_I(inode); |
869f9dfa | 389 | int err = 0; |
1da177e4 | 390 | |
d25be546 TM |
391 | if (delegation == NULL) |
392 | return 0; | |
393 | do { | |
869f9dfa TM |
394 | if (test_bit(NFS_DELEGATION_REVOKED, &delegation->flags)) |
395 | break; | |
d25be546 TM |
396 | err = nfs_delegation_claim_opens(inode, &delegation->stateid); |
397 | if (!issync || err != -EAGAIN) | |
398 | break; | |
399 | /* | |
400 | * Guard against state recovery | |
401 | */ | |
402 | err = nfs4_wait_clnt_recover(clp); | |
403 | } while (err == 0); | |
404 | ||
405 | if (err) { | |
406 | nfs_abort_delegation_return(delegation, clp); | |
407 | goto out; | |
408 | } | |
409 | if (!nfs_detach_delegation(nfsi, delegation, NFS_SERVER(inode))) | |
d18cc1fd | 410 | goto out; |
1da177e4 | 411 | |
d18cc1fd TM |
412 | err = nfs_do_return_delegation(inode, delegation, issync); |
413 | out: | |
414 | return err; | |
90163027 TM |
415 | } |
416 | ||
b757144f TM |
417 | static bool nfs_delegation_need_return(struct nfs_delegation *delegation) |
418 | { | |
419 | bool ret = false; | |
420 | ||
421 | if (test_and_clear_bit(NFS_DELEGATION_RETURN, &delegation->flags)) | |
422 | ret = true; | |
423 | if (test_and_clear_bit(NFS_DELEGATION_RETURN_IF_CLOSED, &delegation->flags) && !ret) { | |
424 | struct inode *inode; | |
425 | ||
426 | spin_lock(&delegation->lock); | |
427 | inode = delegation->inode; | |
428 | if (inode && list_empty(&NFS_I(inode)->open_files)) | |
429 | ret = true; | |
430 | spin_unlock(&delegation->lock); | |
431 | } | |
432 | return ret; | |
433 | } | |
434 | ||
d3978bb3 CL |
435 | /** |
436 | * nfs_client_return_marked_delegations - return previously marked delegations | |
437 | * @clp: nfs_client to process | |
438 | * | |
dc327ed4 TM |
439 | * Note that this function is designed to be called by the state |
440 | * manager thread. For this reason, it cannot flush the dirty data, | |
441 | * since that could deadlock in case of a state recovery error. | |
442 | * | |
d3978bb3 | 443 | * Returns zero on success, or a negative errno value. |
515d8611 | 444 | */ |
d18cc1fd | 445 | int nfs_client_return_marked_delegations(struct nfs_client *clp) |
515d8611 TM |
446 | { |
447 | struct nfs_delegation *delegation; | |
d3978bb3 | 448 | struct nfs_server *server; |
515d8611 | 449 | struct inode *inode; |
d18cc1fd | 450 | int err = 0; |
515d8611 TM |
451 | |
452 | restart: | |
453 | rcu_read_lock(); | |
d3978bb3 CL |
454 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { |
455 | list_for_each_entry_rcu(delegation, &server->delegations, | |
456 | super_list) { | |
b757144f | 457 | if (!nfs_delegation_need_return(delegation)) |
d3978bb3 CL |
458 | continue; |
459 | inode = nfs_delegation_grab_inode(delegation); | |
460 | if (inode == NULL) | |
461 | continue; | |
d25be546 | 462 | delegation = nfs_start_delegation_return_locked(NFS_I(inode)); |
d3978bb3 CL |
463 | rcu_read_unlock(); |
464 | ||
d25be546 | 465 | err = nfs_end_delegation_return(inode, delegation, 0); |
d3978bb3 CL |
466 | iput(inode); |
467 | if (!err) | |
468 | goto restart; | |
469 | set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state); | |
470 | return err; | |
d18cc1fd | 471 | } |
515d8611 TM |
472 | } |
473 | rcu_read_unlock(); | |
d18cc1fd | 474 | return 0; |
515d8611 TM |
475 | } |
476 | ||
d3978bb3 CL |
477 | /** |
478 | * nfs_inode_return_delegation_noreclaim - return delegation, don't reclaim opens | |
479 | * @inode: inode to process | |
480 | * | |
481 | * Does not protect against delegation reclaims, therefore really only safe | |
482 | * to be called from nfs4_clear_inode(). | |
e6f81075 TM |
483 | */ |
484 | void nfs_inode_return_delegation_noreclaim(struct inode *inode) | |
485 | { | |
e6f81075 TM |
486 | struct nfs_delegation *delegation; |
487 | ||
d25be546 TM |
488 | delegation = nfs_inode_detach_delegation(inode); |
489 | if (delegation != NULL) | |
490 | nfs_do_return_delegation(inode, delegation, 0); | |
e6f81075 TM |
491 | } |
492 | ||
d3978bb3 CL |
493 | /** |
494 | * nfs_inode_return_delegation - synchronously return a delegation | |
495 | * @inode: inode to process | |
496 | * | |
c57d1bc5 TM |
497 | * This routine will always flush any dirty data to disk on the |
498 | * assumption that if we need to return the delegation, then | |
499 | * we should stop caching. | |
500 | * | |
d3978bb3 CL |
501 | * Returns zero on success, or a negative errno value. |
502 | */ | |
57ec14c5 | 503 | int nfs4_inode_return_delegation(struct inode *inode) |
90163027 | 504 | { |
90163027 TM |
505 | struct nfs_inode *nfsi = NFS_I(inode); |
506 | struct nfs_delegation *delegation; | |
507 | int err = 0; | |
508 | ||
c57d1bc5 | 509 | nfs_wb_all(inode); |
d25be546 TM |
510 | delegation = nfs_start_delegation_return(nfsi); |
511 | if (delegation != NULL) | |
512 | err = nfs_end_delegation_return(inode, delegation, 1); | |
90163027 | 513 | return err; |
1da177e4 LT |
514 | } |
515 | ||
b757144f TM |
516 | static void nfs_mark_return_if_closed_delegation(struct nfs_server *server, |
517 | struct nfs_delegation *delegation) | |
518 | { | |
519 | set_bit(NFS_DELEGATION_RETURN_IF_CLOSED, &delegation->flags); | |
520 | set_bit(NFS4CLNT_DELEGRETURN, &server->nfs_client->cl_state); | |
521 | } | |
522 | ||
ed1e6211 TM |
523 | static void nfs_mark_return_delegation(struct nfs_server *server, |
524 | struct nfs_delegation *delegation) | |
6411bd4a TM |
525 | { |
526 | set_bit(NFS_DELEGATION_RETURN, &delegation->flags); | |
ed1e6211 | 527 | set_bit(NFS4CLNT_DELEGRETURN, &server->nfs_client->cl_state); |
6411bd4a TM |
528 | } |
529 | ||
5c31e236 TM |
530 | static bool nfs_server_mark_return_all_delegations(struct nfs_server *server) |
531 | { | |
532 | struct nfs_delegation *delegation; | |
533 | bool ret = false; | |
534 | ||
535 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { | |
536 | nfs_mark_return_delegation(server, delegation); | |
537 | ret = true; | |
538 | } | |
539 | return ret; | |
540 | } | |
541 | ||
b02ba0b6 TM |
542 | static void nfs_client_mark_return_all_delegations(struct nfs_client *clp) |
543 | { | |
544 | struct nfs_server *server; | |
545 | ||
546 | rcu_read_lock(); | |
547 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
548 | nfs_server_mark_return_all_delegations(server); | |
549 | rcu_read_unlock(); | |
550 | } | |
551 | ||
552 | static void nfs_delegation_run_state_manager(struct nfs_client *clp) | |
553 | { | |
554 | if (test_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) | |
555 | nfs4_schedule_state_manager(clp); | |
556 | } | |
557 | ||
558 | /** | |
559 | * nfs_expire_all_delegations | |
560 | * @clp: client to process | |
561 | * | |
562 | */ | |
563 | void nfs_expire_all_delegations(struct nfs_client *clp) | |
564 | { | |
565 | nfs_client_mark_return_all_delegations(clp); | |
566 | nfs_delegation_run_state_manager(clp); | |
567 | } | |
568 | ||
d3978bb3 CL |
569 | /** |
570 | * nfs_super_return_all_delegations - return delegations for one superblock | |
571 | * @sb: sb to process | |
572 | * | |
1da177e4 | 573 | */ |
eeebf916 | 574 | void nfs_server_return_all_delegations(struct nfs_server *server) |
1da177e4 | 575 | { |
d3978bb3 | 576 | struct nfs_client *clp = server->nfs_client; |
5c31e236 | 577 | bool need_wait; |
1da177e4 LT |
578 | |
579 | if (clp == NULL) | |
580 | return; | |
d3978bb3 | 581 | |
8383e460 | 582 | rcu_read_lock(); |
5c31e236 | 583 | need_wait = nfs_server_mark_return_all_delegations(server); |
8383e460 | 584 | rcu_read_unlock(); |
d3978bb3 | 585 | |
5c31e236 | 586 | if (need_wait) { |
d18cc1fd | 587 | nfs4_schedule_state_manager(clp); |
5c31e236 TM |
588 | nfs4_wait_clnt_recover(clp); |
589 | } | |
515d8611 TM |
590 | } |
591 | ||
826e0013 | 592 | static void nfs_mark_return_unused_delegation_types(struct nfs_server *server, |
d3978bb3 | 593 | fmode_t flags) |
515d8611 TM |
594 | { |
595 | struct nfs_delegation *delegation; | |
596 | ||
d3978bb3 | 597 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { |
c79571a5 AB |
598 | if ((delegation->type == (FMODE_READ|FMODE_WRITE)) && !(flags & FMODE_WRITE)) |
599 | continue; | |
600 | if (delegation->type & flags) | |
826e0013 | 601 | nfs_mark_return_if_closed_delegation(server, delegation); |
707fb4b3 | 602 | } |
d3978bb3 CL |
603 | } |
604 | ||
826e0013 | 605 | static void nfs_client_mark_return_unused_delegation_types(struct nfs_client *clp, |
d3978bb3 CL |
606 | fmode_t flags) |
607 | { | |
608 | struct nfs_server *server; | |
609 | ||
610 | rcu_read_lock(); | |
611 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
826e0013 | 612 | nfs_mark_return_unused_delegation_types(server, flags); |
515d8611 | 613 | rcu_read_unlock(); |
1da177e4 LT |
614 | } |
615 | ||
869f9dfa TM |
616 | static void nfs_revoke_delegation(struct inode *inode) |
617 | { | |
618 | struct nfs_delegation *delegation; | |
619 | rcu_read_lock(); | |
620 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
621 | if (delegation != NULL) { | |
622 | set_bit(NFS_DELEGATION_REVOKED, &delegation->flags); | |
623 | nfs_mark_return_delegation(NFS_SERVER(inode), delegation); | |
624 | } | |
625 | rcu_read_unlock(); | |
626 | } | |
627 | ||
a1d0b5ee TM |
628 | void nfs_remove_bad_delegation(struct inode *inode) |
629 | { | |
630 | struct nfs_delegation *delegation; | |
631 | ||
869f9dfa | 632 | nfs_revoke_delegation(inode); |
d25be546 | 633 | delegation = nfs_inode_detach_delegation(inode); |
a1d0b5ee TM |
634 | if (delegation) { |
635 | nfs_inode_find_state_and_recover(inode, &delegation->stateid); | |
636 | nfs_free_delegation(delegation); | |
637 | } | |
638 | } | |
9cb81968 | 639 | EXPORT_SYMBOL_GPL(nfs_remove_bad_delegation); |
a1d0b5ee | 640 | |
d3978bb3 | 641 | /** |
826e0013 | 642 | * nfs_expire_unused_delegation_types |
d3978bb3 CL |
643 | * @clp: client to process |
644 | * @flags: delegation types to expire | |
645 | * | |
646 | */ | |
826e0013 | 647 | void nfs_expire_unused_delegation_types(struct nfs_client *clp, fmode_t flags) |
58d9714a | 648 | { |
826e0013 | 649 | nfs_client_mark_return_unused_delegation_types(clp, flags); |
b0d3ded1 | 650 | nfs_delegation_run_state_manager(clp); |
58d9714a TM |
651 | } |
652 | ||
d3978bb3 | 653 | static void nfs_mark_return_unreferenced_delegations(struct nfs_server *server) |
b7391f44 TM |
654 | { |
655 | struct nfs_delegation *delegation; | |
656 | ||
d3978bb3 | 657 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { |
b7391f44 TM |
658 | if (test_and_clear_bit(NFS_DELEGATION_REFERENCED, &delegation->flags)) |
659 | continue; | |
b757144f | 660 | nfs_mark_return_if_closed_delegation(server, delegation); |
b7391f44 | 661 | } |
b7391f44 TM |
662 | } |
663 | ||
d3978bb3 CL |
664 | /** |
665 | * nfs_expire_unreferenced_delegations - Eliminate unused delegations | |
666 | * @clp: nfs_client to process | |
667 | * | |
668 | */ | |
b7391f44 TM |
669 | void nfs_expire_unreferenced_delegations(struct nfs_client *clp) |
670 | { | |
d3978bb3 CL |
671 | struct nfs_server *server; |
672 | ||
673 | rcu_read_lock(); | |
674 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
675 | nfs_mark_return_unreferenced_delegations(server); | |
676 | rcu_read_unlock(); | |
677 | ||
b7391f44 TM |
678 | nfs_delegation_run_state_manager(clp); |
679 | } | |
680 | ||
d3978bb3 CL |
681 | /** |
682 | * nfs_async_inode_return_delegation - asynchronously return a delegation | |
683 | * @inode: inode to process | |
8e663f0e | 684 | * @stateid: state ID information |
d3978bb3 CL |
685 | * |
686 | * Returns zero on success, or a negative errno value. | |
1da177e4 | 687 | */ |
d3978bb3 CL |
688 | int nfs_async_inode_return_delegation(struct inode *inode, |
689 | const nfs4_stateid *stateid) | |
1da177e4 | 690 | { |
ed1e6211 TM |
691 | struct nfs_server *server = NFS_SERVER(inode); |
692 | struct nfs_client *clp = server->nfs_client; | |
6411bd4a | 693 | struct nfs_delegation *delegation; |
1da177e4 | 694 | |
dc327ed4 TM |
695 | filemap_flush(inode->i_mapping); |
696 | ||
6411bd4a TM |
697 | rcu_read_lock(); |
698 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
755a48a7 TM |
699 | if (delegation == NULL) |
700 | goto out_enoent; | |
2597641d | 701 | |
755a48a7 TM |
702 | if (!clp->cl_mvops->match_stateid(&delegation->stateid, stateid)) |
703 | goto out_enoent; | |
ed1e6211 | 704 | nfs_mark_return_delegation(server, delegation); |
6411bd4a | 705 | rcu_read_unlock(); |
d3978bb3 | 706 | |
6411bd4a TM |
707 | nfs_delegation_run_state_manager(clp); |
708 | return 0; | |
755a48a7 TM |
709 | out_enoent: |
710 | rcu_read_unlock(); | |
711 | return -ENOENT; | |
1da177e4 LT |
712 | } |
713 | ||
d3978bb3 CL |
714 | static struct inode * |
715 | nfs_delegation_find_inode_server(struct nfs_server *server, | |
716 | const struct nfs_fh *fhandle) | |
1da177e4 LT |
717 | { |
718 | struct nfs_delegation *delegation; | |
719 | struct inode *res = NULL; | |
d3978bb3 CL |
720 | |
721 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { | |
86e89489 TM |
722 | spin_lock(&delegation->lock); |
723 | if (delegation->inode != NULL && | |
724 | nfs_compare_fh(fhandle, &NFS_I(delegation->inode)->fh) == 0) { | |
1da177e4 | 725 | res = igrab(delegation->inode); |
1da177e4 | 726 | } |
86e89489 TM |
727 | spin_unlock(&delegation->lock); |
728 | if (res != NULL) | |
729 | break; | |
1da177e4 | 730 | } |
d3978bb3 CL |
731 | return res; |
732 | } | |
733 | ||
734 | /** | |
735 | * nfs_delegation_find_inode - retrieve the inode associated with a delegation | |
736 | * @clp: client state handle | |
737 | * @fhandle: filehandle from a delegation recall | |
738 | * | |
739 | * Returns pointer to inode matching "fhandle," or NULL if a matching inode | |
740 | * cannot be found. | |
741 | */ | |
742 | struct inode *nfs_delegation_find_inode(struct nfs_client *clp, | |
743 | const struct nfs_fh *fhandle) | |
744 | { | |
745 | struct nfs_server *server; | |
746 | struct inode *res = NULL; | |
747 | ||
748 | rcu_read_lock(); | |
749 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { | |
750 | res = nfs_delegation_find_inode_server(server, fhandle); | |
751 | if (res != NULL) | |
752 | break; | |
753 | } | |
8383e460 | 754 | rcu_read_unlock(); |
1da177e4 LT |
755 | return res; |
756 | } | |
757 | ||
d3978bb3 CL |
758 | static void nfs_delegation_mark_reclaim_server(struct nfs_server *server) |
759 | { | |
760 | struct nfs_delegation *delegation; | |
761 | ||
762 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) | |
763 | set_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags); | |
764 | } | |
765 | ||
766 | /** | |
767 | * nfs_delegation_mark_reclaim - mark all delegations as needing to be reclaimed | |
768 | * @clp: nfs_client to process | |
769 | * | |
1da177e4 | 770 | */ |
adfa6f98 | 771 | void nfs_delegation_mark_reclaim(struct nfs_client *clp) |
1da177e4 | 772 | { |
d3978bb3 CL |
773 | struct nfs_server *server; |
774 | ||
8383e460 | 775 | rcu_read_lock(); |
d3978bb3 CL |
776 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) |
777 | nfs_delegation_mark_reclaim_server(server); | |
8383e460 | 778 | rcu_read_unlock(); |
1da177e4 LT |
779 | } |
780 | ||
d3978bb3 CL |
781 | /** |
782 | * nfs_delegation_reap_unclaimed - reap unclaimed delegations after reboot recovery is done | |
783 | * @clp: nfs_client to process | |
784 | * | |
1da177e4 | 785 | */ |
adfa6f98 | 786 | void nfs_delegation_reap_unclaimed(struct nfs_client *clp) |
1da177e4 | 787 | { |
8383e460 | 788 | struct nfs_delegation *delegation; |
d3978bb3 | 789 | struct nfs_server *server; |
86e89489 | 790 | struct inode *inode; |
d3978bb3 | 791 | |
8383e460 TM |
792 | restart: |
793 | rcu_read_lock(); | |
d3978bb3 CL |
794 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { |
795 | list_for_each_entry_rcu(delegation, &server->delegations, | |
796 | super_list) { | |
797 | if (test_bit(NFS_DELEGATION_NEED_RECLAIM, | |
798 | &delegation->flags) == 0) | |
799 | continue; | |
800 | inode = nfs_delegation_grab_inode(delegation); | |
801 | if (inode == NULL) | |
802 | continue; | |
803 | delegation = nfs_detach_delegation(NFS_I(inode), | |
d25be546 | 804 | delegation, server); |
d3978bb3 CL |
805 | rcu_read_unlock(); |
806 | ||
807 | if (delegation != NULL) | |
808 | nfs_free_delegation(delegation); | |
809 | iput(inode); | |
810 | goto restart; | |
811 | } | |
1da177e4 | 812 | } |
8383e460 | 813 | rcu_read_unlock(); |
1da177e4 | 814 | } |
3e4f6290 | 815 | |
d3978bb3 CL |
816 | /** |
817 | * nfs_delegations_present - check for existence of delegations | |
818 | * @clp: client state handle | |
819 | * | |
820 | * Returns one if there are any nfs_delegation structures attached | |
821 | * to this nfs_client. | |
822 | */ | |
823 | int nfs_delegations_present(struct nfs_client *clp) | |
824 | { | |
825 | struct nfs_server *server; | |
826 | int ret = 0; | |
827 | ||
828 | rcu_read_lock(); | |
829 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
830 | if (!list_empty(&server->delegations)) { | |
831 | ret = 1; | |
832 | break; | |
833 | } | |
834 | rcu_read_unlock(); | |
835 | return ret; | |
836 | } | |
837 | ||
838 | /** | |
839 | * nfs4_copy_delegation_stateid - Copy inode's state ID information | |
840 | * @dst: stateid data structure to fill in | |
841 | * @inode: inode to check | |
0032a7a7 | 842 | * @flags: delegation type requirement |
d3978bb3 | 843 | * |
0032a7a7 TM |
844 | * Returns "true" and fills in "dst->data" * if inode had a delegation, |
845 | * otherwise "false" is returned. | |
d3978bb3 | 846 | */ |
0032a7a7 TM |
847 | bool nfs4_copy_delegation_stateid(nfs4_stateid *dst, struct inode *inode, |
848 | fmode_t flags) | |
3e4f6290 | 849 | { |
3e4f6290 TM |
850 | struct nfs_inode *nfsi = NFS_I(inode); |
851 | struct nfs_delegation *delegation; | |
0032a7a7 | 852 | bool ret; |
3e4f6290 | 853 | |
0032a7a7 | 854 | flags &= FMODE_READ|FMODE_WRITE; |
8383e460 TM |
855 | rcu_read_lock(); |
856 | delegation = rcu_dereference(nfsi->delegation); | |
0032a7a7 TM |
857 | ret = (delegation != NULL && (delegation->type & flags) == flags); |
858 | if (ret) { | |
f597c537 | 859 | nfs4_stateid_copy(dst, &delegation->stateid); |
0032a7a7 | 860 | nfs_mark_delegation_referenced(delegation); |
3e4f6290 | 861 | } |
8383e460 TM |
862 | rcu_read_unlock(); |
863 | return ret; | |
3e4f6290 | 864 | } |