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 | */ | |
011e2a7f | 50 | int nfs4_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); | |
d25be546 TM |
58 | if (delegation != NULL && (delegation->type & flags) == flags && |
59 | !test_bit(NFS_DELEGATION_RETURNING, &delegation->flags)) { | |
b7391f44 TM |
60 | nfs_mark_delegation_referenced(delegation); |
61 | ret = 1; | |
62 | } | |
63 | rcu_read_unlock(); | |
64 | return ret; | |
65 | } | |
66 | ||
db4f2e63 | 67 | static int nfs_delegation_claim_locks(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid) |
888e694c TM |
68 | { |
69 | struct inode *inode = state->inode; | |
70 | struct file_lock *fl; | |
d5122201 | 71 | int status = 0; |
888e694c | 72 | |
65b62a29 TM |
73 | if (inode->i_flock == NULL) |
74 | goto out; | |
314d7cc0 | 75 | |
1c8c601a JL |
76 | /* Protect inode->i_flock using the i_lock */ |
77 | spin_lock(&inode->i_lock); | |
90dc7d27 | 78 | for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) { |
888e694c TM |
79 | if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK))) |
80 | continue; | |
cd3758e3 | 81 | if (nfs_file_open_context(fl->fl_file) != ctx) |
888e694c | 82 | continue; |
1c8c601a | 83 | spin_unlock(&inode->i_lock); |
db4f2e63 | 84 | status = nfs4_lock_delegation_recall(fl, state, stateid); |
d5122201 | 85 | if (status < 0) |
3f09df70 | 86 | goto out; |
1c8c601a | 87 | spin_lock(&inode->i_lock); |
888e694c | 88 | } |
1c8c601a | 89 | spin_unlock(&inode->i_lock); |
3f09df70 | 90 | out: |
888e694c TM |
91 | return status; |
92 | } | |
93 | ||
d18cc1fd | 94 | static int nfs_delegation_claim_opens(struct inode *inode, const nfs4_stateid *stateid) |
1da177e4 LT |
95 | { |
96 | struct nfs_inode *nfsi = NFS_I(inode); | |
97 | struct nfs_open_context *ctx; | |
d25be546 | 98 | struct nfs4_state_owner *sp; |
1da177e4 | 99 | struct nfs4_state *state; |
d25be546 | 100 | unsigned int seq; |
888e694c | 101 | int err; |
1da177e4 LT |
102 | |
103 | again: | |
104 | spin_lock(&inode->i_lock); | |
105 | list_for_each_entry(ctx, &nfsi->open_files, list) { | |
106 | state = ctx->state; | |
107 | if (state == NULL) | |
108 | continue; | |
109 | if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) | |
110 | continue; | |
f597c537 | 111 | if (!nfs4_stateid_match(&state->stateid, stateid)) |
90163027 | 112 | continue; |
1da177e4 LT |
113 | get_nfs_open_context(ctx); |
114 | spin_unlock(&inode->i_lock); | |
d25be546 | 115 | sp = state->owner; |
65b62a29 TM |
116 | /* Block nfs4_proc_unlck */ |
117 | mutex_lock(&sp->so_delegreturn_mutex); | |
d25be546 | 118 | seq = raw_seqcount_begin(&sp->so_reclaim_seqcount); |
13437e12 | 119 | err = nfs4_open_delegation_recall(ctx, state, stateid); |
d25be546 | 120 | if (!err) |
db4f2e63 | 121 | err = nfs_delegation_claim_locks(ctx, state, stateid); |
d25be546 TM |
122 | if (!err && read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) |
123 | err = -EAGAIN; | |
65b62a29 | 124 | mutex_unlock(&sp->so_delegreturn_mutex); |
1da177e4 | 125 | put_nfs_open_context(ctx); |
888e694c | 126 | if (err != 0) |
d18cc1fd | 127 | return err; |
1da177e4 LT |
128 | goto again; |
129 | } | |
130 | spin_unlock(&inode->i_lock); | |
d18cc1fd | 131 | return 0; |
1da177e4 LT |
132 | } |
133 | ||
d3978bb3 CL |
134 | /** |
135 | * nfs_inode_reclaim_delegation - process a delegation reclaim request | |
136 | * @inode: inode to process | |
137 | * @cred: credential to use for request | |
138 | * @res: new delegation state from server | |
139 | * | |
1da177e4 | 140 | */ |
d3978bb3 CL |
141 | void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, |
142 | struct nfs_openres *res) | |
1da177e4 | 143 | { |
8f649c37 TM |
144 | struct nfs_delegation *delegation; |
145 | struct rpc_cred *oldcred = NULL; | |
1da177e4 | 146 | |
8f649c37 TM |
147 | rcu_read_lock(); |
148 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
149 | if (delegation != NULL) { | |
150 | spin_lock(&delegation->lock); | |
151 | if (delegation->inode != NULL) { | |
f597c537 | 152 | nfs4_stateid_copy(&delegation->stateid, &res->delegation); |
8f649c37 TM |
153 | delegation->type = res->delegation_type; |
154 | delegation->maxsize = res->maxsize; | |
155 | oldcred = delegation->cred; | |
156 | delegation->cred = get_rpccred(cred); | |
157 | clear_bit(NFS_DELEGATION_NEED_RECLAIM, | |
158 | &delegation->flags); | |
159 | NFS_I(inode)->delegation_state = delegation->type; | |
160 | spin_unlock(&delegation->lock); | |
161 | put_rpccred(oldcred); | |
162 | rcu_read_unlock(); | |
163 | } else { | |
164 | /* We appear to have raced with a delegation return. */ | |
165 | spin_unlock(&delegation->lock); | |
166 | rcu_read_unlock(); | |
167 | nfs_inode_set_delegation(inode, cred, res); | |
168 | } | |
169 | } else { | |
170 | rcu_read_unlock(); | |
171 | } | |
1da177e4 LT |
172 | } |
173 | ||
57bfa891 TM |
174 | static int nfs_do_return_delegation(struct inode *inode, struct nfs_delegation *delegation, int issync) |
175 | { | |
176 | int res = 0; | |
177 | ||
178 | res = nfs4_proc_delegreturn(inode, delegation->cred, &delegation->stateid, issync); | |
179 | nfs_free_delegation(delegation); | |
180 | return res; | |
181 | } | |
182 | ||
86e89489 TM |
183 | static struct inode *nfs_delegation_grab_inode(struct nfs_delegation *delegation) |
184 | { | |
185 | struct inode *inode = NULL; | |
186 | ||
187 | spin_lock(&delegation->lock); | |
188 | if (delegation->inode != NULL) | |
189 | inode = igrab(delegation->inode); | |
190 | spin_unlock(&delegation->lock); | |
191 | return inode; | |
192 | } | |
193 | ||
d25be546 TM |
194 | static struct nfs_delegation * |
195 | nfs_start_delegation_return_locked(struct nfs_inode *nfsi) | |
196 | { | |
197 | struct nfs_delegation *ret = NULL; | |
198 | struct nfs_delegation *delegation = rcu_dereference(nfsi->delegation); | |
199 | ||
200 | if (delegation == NULL) | |
201 | goto out; | |
202 | spin_lock(&delegation->lock); | |
203 | if (!test_and_set_bit(NFS_DELEGATION_RETURNING, &delegation->flags)) | |
204 | ret = delegation; | |
205 | spin_unlock(&delegation->lock); | |
206 | out: | |
207 | return ret; | |
208 | } | |
209 | ||
210 | static struct nfs_delegation * | |
211 | nfs_start_delegation_return(struct nfs_inode *nfsi) | |
212 | { | |
213 | struct nfs_delegation *delegation; | |
214 | ||
215 | rcu_read_lock(); | |
216 | delegation = nfs_start_delegation_return_locked(nfsi); | |
217 | rcu_read_unlock(); | |
218 | return delegation; | |
219 | } | |
220 | ||
221 | static void | |
222 | nfs_abort_delegation_return(struct nfs_delegation *delegation, | |
223 | struct nfs_client *clp) | |
224 | { | |
225 | ||
226 | spin_lock(&delegation->lock); | |
227 | clear_bit(NFS_DELEGATION_RETURNING, &delegation->flags); | |
228 | set_bit(NFS_DELEGATION_RETURN, &delegation->flags); | |
229 | spin_unlock(&delegation->lock); | |
230 | set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state); | |
231 | } | |
232 | ||
dda4b225 CL |
233 | static struct nfs_delegation * |
234 | nfs_detach_delegation_locked(struct nfs_inode *nfsi, | |
d25be546 TM |
235 | struct nfs_delegation *delegation, |
236 | struct nfs_client *clp) | |
57bfa891 | 237 | { |
d25be546 | 238 | struct nfs_delegation *deleg_cur = |
17d2c0a0 | 239 | rcu_dereference_protected(nfsi->delegation, |
d25be546 | 240 | lockdep_is_held(&clp->cl_lock)); |
57bfa891 | 241 | |
d25be546 TM |
242 | if (deleg_cur == NULL || delegation != deleg_cur) |
243 | return NULL; | |
dda4b225 | 244 | |
34310430 | 245 | spin_lock(&delegation->lock); |
d25be546 | 246 | set_bit(NFS_DELEGATION_RETURNING, &delegation->flags); |
57bfa891 | 247 | list_del_rcu(&delegation->super_list); |
86e89489 | 248 | delegation->inode = NULL; |
57bfa891 TM |
249 | nfsi->delegation_state = 0; |
250 | rcu_assign_pointer(nfsi->delegation, NULL); | |
34310430 | 251 | spin_unlock(&delegation->lock); |
57bfa891 | 252 | return delegation; |
57bfa891 TM |
253 | } |
254 | ||
dda4b225 | 255 | static struct nfs_delegation *nfs_detach_delegation(struct nfs_inode *nfsi, |
d25be546 TM |
256 | struct nfs_delegation *delegation, |
257 | struct nfs_server *server) | |
dda4b225 | 258 | { |
d3978bb3 | 259 | struct nfs_client *clp = server->nfs_client; |
dda4b225 CL |
260 | |
261 | spin_lock(&clp->cl_lock); | |
d25be546 | 262 | delegation = nfs_detach_delegation_locked(nfsi, delegation, clp); |
dda4b225 CL |
263 | spin_unlock(&clp->cl_lock); |
264 | return delegation; | |
265 | } | |
266 | ||
d25be546 TM |
267 | static struct nfs_delegation * |
268 | nfs_inode_detach_delegation(struct inode *inode) | |
269 | { | |
270 | struct nfs_inode *nfsi = NFS_I(inode); | |
271 | struct nfs_server *server = NFS_SERVER(inode); | |
272 | struct nfs_delegation *delegation; | |
273 | ||
274 | delegation = nfs_start_delegation_return(nfsi); | |
275 | if (delegation == NULL) | |
276 | return NULL; | |
277 | return nfs_detach_delegation(nfsi, delegation, server); | |
278 | } | |
279 | ||
d3978bb3 CL |
280 | /** |
281 | * nfs_inode_set_delegation - set up a delegation on an inode | |
282 | * @inode: inode to which delegation applies | |
283 | * @cred: cred to use for subsequent delegation processing | |
284 | * @res: new delegation state from server | |
285 | * | |
286 | * Returns zero on success, or a negative errno value. | |
1da177e4 LT |
287 | */ |
288 | int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res) | |
289 | { | |
d3978bb3 CL |
290 | struct nfs_server *server = NFS_SERVER(inode); |
291 | struct nfs_client *clp = server->nfs_client; | |
1da177e4 | 292 | struct nfs_inode *nfsi = NFS_I(inode); |
17d2c0a0 | 293 | struct nfs_delegation *delegation, *old_delegation; |
57bfa891 | 294 | struct nfs_delegation *freeme = NULL; |
1da177e4 LT |
295 | int status = 0; |
296 | ||
8535b2be | 297 | delegation = kmalloc(sizeof(*delegation), GFP_NOFS); |
1da177e4 LT |
298 | if (delegation == NULL) |
299 | return -ENOMEM; | |
f597c537 | 300 | nfs4_stateid_copy(&delegation->stateid, &res->delegation); |
1da177e4 LT |
301 | delegation->type = res->delegation_type; |
302 | delegation->maxsize = res->maxsize; | |
a9a4a87a | 303 | delegation->change_attr = inode->i_version; |
1da177e4 LT |
304 | delegation->cred = get_rpccred(cred); |
305 | delegation->inode = inode; | |
b7391f44 | 306 | delegation->flags = 1<<NFS_DELEGATION_REFERENCED; |
34310430 | 307 | spin_lock_init(&delegation->lock); |
1da177e4 LT |
308 | |
309 | spin_lock(&clp->cl_lock); | |
17d2c0a0 | 310 | old_delegation = rcu_dereference_protected(nfsi->delegation, |
d3978bb3 | 311 | lockdep_is_held(&clp->cl_lock)); |
17d2c0a0 | 312 | if (old_delegation != NULL) { |
f597c537 TM |
313 | if (nfs4_stateid_match(&delegation->stateid, |
314 | &old_delegation->stateid) && | |
17d2c0a0 | 315 | delegation->type == old_delegation->type) { |
57bfa891 | 316 | goto out; |
1da177e4 | 317 | } |
57bfa891 TM |
318 | /* |
319 | * Deal with broken servers that hand out two | |
320 | * delegations for the same file. | |
17280175 TM |
321 | * Allow for upgrades to a WRITE delegation, but |
322 | * nothing else. | |
57bfa891 TM |
323 | */ |
324 | dfprintk(FILE, "%s: server %s handed out " | |
325 | "a duplicate delegation!\n", | |
3110ff80 | 326 | __func__, clp->cl_hostname); |
17280175 TM |
327 | if (delegation->type == old_delegation->type || |
328 | !(delegation->type & FMODE_WRITE)) { | |
57bfa891 TM |
329 | freeme = delegation; |
330 | delegation = NULL; | |
331 | goto out; | |
332 | } | |
d25be546 TM |
333 | freeme = nfs_detach_delegation_locked(nfsi, |
334 | old_delegation, clp); | |
335 | if (freeme == NULL) | |
336 | goto out; | |
1da177e4 | 337 | } |
d3978bb3 | 338 | list_add_rcu(&delegation->super_list, &server->delegations); |
57bfa891 TM |
339 | nfsi->delegation_state = delegation->type; |
340 | rcu_assign_pointer(nfsi->delegation, delegation); | |
341 | delegation = NULL; | |
412c77ce TM |
342 | |
343 | /* Ensure we revalidate the attributes and page cache! */ | |
344 | spin_lock(&inode->i_lock); | |
345 | nfsi->cache_validity |= NFS_INO_REVAL_FORCED; | |
346 | spin_unlock(&inode->i_lock); | |
347 | ||
57bfa891 | 348 | out: |
1da177e4 | 349 | spin_unlock(&clp->cl_lock); |
603c83da TM |
350 | if (delegation != NULL) |
351 | nfs_free_delegation(delegation); | |
57bfa891 TM |
352 | if (freeme != NULL) |
353 | nfs_do_return_delegation(inode, freeme, 0); | |
1da177e4 LT |
354 | return status; |
355 | } | |
356 | ||
1da177e4 LT |
357 | /* |
358 | * Basic procedure for returning a delegation to the server | |
359 | */ | |
d25be546 | 360 | static int nfs_end_delegation_return(struct inode *inode, struct nfs_delegation *delegation, int issync) |
1da177e4 | 361 | { |
d25be546 | 362 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; |
1da177e4 | 363 | struct nfs_inode *nfsi = NFS_I(inode); |
d18cc1fd | 364 | int err; |
1da177e4 | 365 | |
d25be546 TM |
366 | if (delegation == NULL) |
367 | return 0; | |
368 | do { | |
369 | err = nfs_delegation_claim_opens(inode, &delegation->stateid); | |
370 | if (!issync || err != -EAGAIN) | |
371 | break; | |
372 | /* | |
373 | * Guard against state recovery | |
374 | */ | |
375 | err = nfs4_wait_clnt_recover(clp); | |
376 | } while (err == 0); | |
377 | ||
378 | if (err) { | |
379 | nfs_abort_delegation_return(delegation, clp); | |
380 | goto out; | |
381 | } | |
382 | if (!nfs_detach_delegation(nfsi, delegation, NFS_SERVER(inode))) | |
d18cc1fd | 383 | goto out; |
1da177e4 | 384 | |
d18cc1fd TM |
385 | err = nfs_do_return_delegation(inode, delegation, issync); |
386 | out: | |
387 | return err; | |
90163027 TM |
388 | } |
389 | ||
b757144f TM |
390 | static bool nfs_delegation_need_return(struct nfs_delegation *delegation) |
391 | { | |
392 | bool ret = false; | |
393 | ||
394 | if (test_and_clear_bit(NFS_DELEGATION_RETURN, &delegation->flags)) | |
395 | ret = true; | |
396 | if (test_and_clear_bit(NFS_DELEGATION_RETURN_IF_CLOSED, &delegation->flags) && !ret) { | |
397 | struct inode *inode; | |
398 | ||
399 | spin_lock(&delegation->lock); | |
400 | inode = delegation->inode; | |
401 | if (inode && list_empty(&NFS_I(inode)->open_files)) | |
402 | ret = true; | |
403 | spin_unlock(&delegation->lock); | |
404 | } | |
405 | return ret; | |
406 | } | |
407 | ||
d3978bb3 CL |
408 | /** |
409 | * nfs_client_return_marked_delegations - return previously marked delegations | |
410 | * @clp: nfs_client to process | |
411 | * | |
dc327ed4 TM |
412 | * Note that this function is designed to be called by the state |
413 | * manager thread. For this reason, it cannot flush the dirty data, | |
414 | * since that could deadlock in case of a state recovery error. | |
415 | * | |
d3978bb3 | 416 | * Returns zero on success, or a negative errno value. |
515d8611 | 417 | */ |
d18cc1fd | 418 | int nfs_client_return_marked_delegations(struct nfs_client *clp) |
515d8611 TM |
419 | { |
420 | struct nfs_delegation *delegation; | |
d3978bb3 | 421 | struct nfs_server *server; |
515d8611 | 422 | struct inode *inode; |
d18cc1fd | 423 | int err = 0; |
515d8611 TM |
424 | |
425 | restart: | |
426 | rcu_read_lock(); | |
d3978bb3 CL |
427 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { |
428 | list_for_each_entry_rcu(delegation, &server->delegations, | |
429 | super_list) { | |
b757144f | 430 | if (!nfs_delegation_need_return(delegation)) |
d3978bb3 CL |
431 | continue; |
432 | inode = nfs_delegation_grab_inode(delegation); | |
433 | if (inode == NULL) | |
434 | continue; | |
d25be546 | 435 | delegation = nfs_start_delegation_return_locked(NFS_I(inode)); |
d3978bb3 CL |
436 | rcu_read_unlock(); |
437 | ||
d25be546 | 438 | err = nfs_end_delegation_return(inode, delegation, 0); |
d3978bb3 CL |
439 | iput(inode); |
440 | if (!err) | |
441 | goto restart; | |
442 | set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state); | |
443 | return err; | |
d18cc1fd | 444 | } |
515d8611 TM |
445 | } |
446 | rcu_read_unlock(); | |
d18cc1fd | 447 | return 0; |
515d8611 TM |
448 | } |
449 | ||
d3978bb3 CL |
450 | /** |
451 | * nfs_inode_return_delegation_noreclaim - return delegation, don't reclaim opens | |
452 | * @inode: inode to process | |
453 | * | |
454 | * Does not protect against delegation reclaims, therefore really only safe | |
455 | * to be called from nfs4_clear_inode(). | |
e6f81075 TM |
456 | */ |
457 | void nfs_inode_return_delegation_noreclaim(struct inode *inode) | |
458 | { | |
e6f81075 TM |
459 | struct nfs_delegation *delegation; |
460 | ||
d25be546 TM |
461 | delegation = nfs_inode_detach_delegation(inode); |
462 | if (delegation != NULL) | |
463 | nfs_do_return_delegation(inode, delegation, 0); | |
e6f81075 TM |
464 | } |
465 | ||
d3978bb3 CL |
466 | /** |
467 | * nfs_inode_return_delegation - synchronously return a delegation | |
468 | * @inode: inode to process | |
469 | * | |
c57d1bc5 TM |
470 | * This routine will always flush any dirty data to disk on the |
471 | * assumption that if we need to return the delegation, then | |
472 | * we should stop caching. | |
473 | * | |
d3978bb3 CL |
474 | * Returns zero on success, or a negative errno value. |
475 | */ | |
57ec14c5 | 476 | int nfs4_inode_return_delegation(struct inode *inode) |
90163027 | 477 | { |
90163027 TM |
478 | struct nfs_inode *nfsi = NFS_I(inode); |
479 | struct nfs_delegation *delegation; | |
480 | int err = 0; | |
481 | ||
c57d1bc5 | 482 | nfs_wb_all(inode); |
d25be546 TM |
483 | delegation = nfs_start_delegation_return(nfsi); |
484 | if (delegation != NULL) | |
485 | err = nfs_end_delegation_return(inode, delegation, 1); | |
90163027 | 486 | return err; |
1da177e4 LT |
487 | } |
488 | ||
b757144f TM |
489 | static void nfs_mark_return_if_closed_delegation(struct nfs_server *server, |
490 | struct nfs_delegation *delegation) | |
491 | { | |
492 | set_bit(NFS_DELEGATION_RETURN_IF_CLOSED, &delegation->flags); | |
493 | set_bit(NFS4CLNT_DELEGRETURN, &server->nfs_client->cl_state); | |
494 | } | |
495 | ||
ed1e6211 TM |
496 | static void nfs_mark_return_delegation(struct nfs_server *server, |
497 | struct nfs_delegation *delegation) | |
6411bd4a TM |
498 | { |
499 | set_bit(NFS_DELEGATION_RETURN, &delegation->flags); | |
ed1e6211 | 500 | set_bit(NFS4CLNT_DELEGRETURN, &server->nfs_client->cl_state); |
6411bd4a TM |
501 | } |
502 | ||
5c31e236 TM |
503 | static bool nfs_server_mark_return_all_delegations(struct nfs_server *server) |
504 | { | |
505 | struct nfs_delegation *delegation; | |
506 | bool ret = false; | |
507 | ||
508 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { | |
509 | nfs_mark_return_delegation(server, delegation); | |
510 | ret = true; | |
511 | } | |
512 | return ret; | |
513 | } | |
514 | ||
b02ba0b6 TM |
515 | static void nfs_client_mark_return_all_delegations(struct nfs_client *clp) |
516 | { | |
517 | struct nfs_server *server; | |
518 | ||
519 | rcu_read_lock(); | |
520 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
521 | nfs_server_mark_return_all_delegations(server); | |
522 | rcu_read_unlock(); | |
523 | } | |
524 | ||
525 | static void nfs_delegation_run_state_manager(struct nfs_client *clp) | |
526 | { | |
527 | if (test_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) | |
528 | nfs4_schedule_state_manager(clp); | |
529 | } | |
530 | ||
531 | /** | |
532 | * nfs_expire_all_delegations | |
533 | * @clp: client to process | |
534 | * | |
535 | */ | |
536 | void nfs_expire_all_delegations(struct nfs_client *clp) | |
537 | { | |
538 | nfs_client_mark_return_all_delegations(clp); | |
539 | nfs_delegation_run_state_manager(clp); | |
540 | } | |
541 | ||
d3978bb3 CL |
542 | /** |
543 | * nfs_super_return_all_delegations - return delegations for one superblock | |
544 | * @sb: sb to process | |
545 | * | |
1da177e4 | 546 | */ |
eeebf916 | 547 | void nfs_server_return_all_delegations(struct nfs_server *server) |
1da177e4 | 548 | { |
d3978bb3 | 549 | struct nfs_client *clp = server->nfs_client; |
5c31e236 | 550 | bool need_wait; |
1da177e4 LT |
551 | |
552 | if (clp == NULL) | |
553 | return; | |
d3978bb3 | 554 | |
8383e460 | 555 | rcu_read_lock(); |
5c31e236 | 556 | need_wait = nfs_server_mark_return_all_delegations(server); |
8383e460 | 557 | rcu_read_unlock(); |
d3978bb3 | 558 | |
5c31e236 | 559 | if (need_wait) { |
d18cc1fd | 560 | nfs4_schedule_state_manager(clp); |
5c31e236 TM |
561 | nfs4_wait_clnt_recover(clp); |
562 | } | |
515d8611 TM |
563 | } |
564 | ||
826e0013 | 565 | static void nfs_mark_return_unused_delegation_types(struct nfs_server *server, |
d3978bb3 | 566 | fmode_t flags) |
515d8611 TM |
567 | { |
568 | struct nfs_delegation *delegation; | |
569 | ||
d3978bb3 | 570 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { |
c79571a5 AB |
571 | if ((delegation->type == (FMODE_READ|FMODE_WRITE)) && !(flags & FMODE_WRITE)) |
572 | continue; | |
573 | if (delegation->type & flags) | |
826e0013 | 574 | nfs_mark_return_if_closed_delegation(server, delegation); |
707fb4b3 | 575 | } |
d3978bb3 CL |
576 | } |
577 | ||
826e0013 | 578 | static void nfs_client_mark_return_unused_delegation_types(struct nfs_client *clp, |
d3978bb3 CL |
579 | fmode_t flags) |
580 | { | |
581 | struct nfs_server *server; | |
582 | ||
583 | rcu_read_lock(); | |
584 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
826e0013 | 585 | nfs_mark_return_unused_delegation_types(server, flags); |
515d8611 | 586 | rcu_read_unlock(); |
1da177e4 LT |
587 | } |
588 | ||
a1d0b5ee TM |
589 | void nfs_remove_bad_delegation(struct inode *inode) |
590 | { | |
591 | struct nfs_delegation *delegation; | |
592 | ||
d25be546 | 593 | delegation = nfs_inode_detach_delegation(inode); |
a1d0b5ee TM |
594 | if (delegation) { |
595 | nfs_inode_find_state_and_recover(inode, &delegation->stateid); | |
596 | nfs_free_delegation(delegation); | |
597 | } | |
598 | } | |
9cb81968 | 599 | EXPORT_SYMBOL_GPL(nfs_remove_bad_delegation); |
a1d0b5ee | 600 | |
d3978bb3 | 601 | /** |
826e0013 | 602 | * nfs_expire_unused_delegation_types |
d3978bb3 CL |
603 | * @clp: client to process |
604 | * @flags: delegation types to expire | |
605 | * | |
606 | */ | |
826e0013 | 607 | void nfs_expire_unused_delegation_types(struct nfs_client *clp, fmode_t flags) |
58d9714a | 608 | { |
826e0013 | 609 | nfs_client_mark_return_unused_delegation_types(clp, flags); |
b0d3ded1 | 610 | nfs_delegation_run_state_manager(clp); |
58d9714a TM |
611 | } |
612 | ||
d3978bb3 | 613 | static void nfs_mark_return_unreferenced_delegations(struct nfs_server *server) |
b7391f44 TM |
614 | { |
615 | struct nfs_delegation *delegation; | |
616 | ||
d3978bb3 | 617 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { |
b7391f44 TM |
618 | if (test_and_clear_bit(NFS_DELEGATION_REFERENCED, &delegation->flags)) |
619 | continue; | |
b757144f | 620 | nfs_mark_return_if_closed_delegation(server, delegation); |
b7391f44 | 621 | } |
b7391f44 TM |
622 | } |
623 | ||
d3978bb3 CL |
624 | /** |
625 | * nfs_expire_unreferenced_delegations - Eliminate unused delegations | |
626 | * @clp: nfs_client to process | |
627 | * | |
628 | */ | |
b7391f44 TM |
629 | void nfs_expire_unreferenced_delegations(struct nfs_client *clp) |
630 | { | |
d3978bb3 CL |
631 | struct nfs_server *server; |
632 | ||
633 | rcu_read_lock(); | |
634 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
635 | nfs_mark_return_unreferenced_delegations(server); | |
636 | rcu_read_unlock(); | |
637 | ||
b7391f44 TM |
638 | nfs_delegation_run_state_manager(clp); |
639 | } | |
640 | ||
d3978bb3 CL |
641 | /** |
642 | * nfs_async_inode_return_delegation - asynchronously return a delegation | |
643 | * @inode: inode to process | |
8e663f0e | 644 | * @stateid: state ID information |
d3978bb3 CL |
645 | * |
646 | * Returns zero on success, or a negative errno value. | |
1da177e4 | 647 | */ |
d3978bb3 CL |
648 | int nfs_async_inode_return_delegation(struct inode *inode, |
649 | const nfs4_stateid *stateid) | |
1da177e4 | 650 | { |
ed1e6211 TM |
651 | struct nfs_server *server = NFS_SERVER(inode); |
652 | struct nfs_client *clp = server->nfs_client; | |
6411bd4a | 653 | struct nfs_delegation *delegation; |
1da177e4 | 654 | |
dc327ed4 TM |
655 | filemap_flush(inode->i_mapping); |
656 | ||
6411bd4a TM |
657 | rcu_read_lock(); |
658 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
2597641d | 659 | |
36281caa | 660 | if (!clp->cl_mvops->match_stateid(&delegation->stateid, stateid)) { |
6411bd4a TM |
661 | rcu_read_unlock(); |
662 | return -ENOENT; | |
663 | } | |
ed1e6211 | 664 | nfs_mark_return_delegation(server, delegation); |
6411bd4a | 665 | rcu_read_unlock(); |
d3978bb3 | 666 | |
6411bd4a TM |
667 | nfs_delegation_run_state_manager(clp); |
668 | return 0; | |
1da177e4 LT |
669 | } |
670 | ||
d3978bb3 CL |
671 | static struct inode * |
672 | nfs_delegation_find_inode_server(struct nfs_server *server, | |
673 | const struct nfs_fh *fhandle) | |
1da177e4 LT |
674 | { |
675 | struct nfs_delegation *delegation; | |
676 | struct inode *res = NULL; | |
d3978bb3 CL |
677 | |
678 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { | |
86e89489 TM |
679 | spin_lock(&delegation->lock); |
680 | if (delegation->inode != NULL && | |
681 | nfs_compare_fh(fhandle, &NFS_I(delegation->inode)->fh) == 0) { | |
1da177e4 | 682 | res = igrab(delegation->inode); |
1da177e4 | 683 | } |
86e89489 TM |
684 | spin_unlock(&delegation->lock); |
685 | if (res != NULL) | |
686 | break; | |
1da177e4 | 687 | } |
d3978bb3 CL |
688 | return res; |
689 | } | |
690 | ||
691 | /** | |
692 | * nfs_delegation_find_inode - retrieve the inode associated with a delegation | |
693 | * @clp: client state handle | |
694 | * @fhandle: filehandle from a delegation recall | |
695 | * | |
696 | * Returns pointer to inode matching "fhandle," or NULL if a matching inode | |
697 | * cannot be found. | |
698 | */ | |
699 | struct inode *nfs_delegation_find_inode(struct nfs_client *clp, | |
700 | const struct nfs_fh *fhandle) | |
701 | { | |
702 | struct nfs_server *server; | |
703 | struct inode *res = NULL; | |
704 | ||
705 | rcu_read_lock(); | |
706 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { | |
707 | res = nfs_delegation_find_inode_server(server, fhandle); | |
708 | if (res != NULL) | |
709 | break; | |
710 | } | |
8383e460 | 711 | rcu_read_unlock(); |
1da177e4 LT |
712 | return res; |
713 | } | |
714 | ||
d3978bb3 CL |
715 | static void nfs_delegation_mark_reclaim_server(struct nfs_server *server) |
716 | { | |
717 | struct nfs_delegation *delegation; | |
718 | ||
719 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) | |
720 | set_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags); | |
721 | } | |
722 | ||
723 | /** | |
724 | * nfs_delegation_mark_reclaim - mark all delegations as needing to be reclaimed | |
725 | * @clp: nfs_client to process | |
726 | * | |
1da177e4 | 727 | */ |
adfa6f98 | 728 | void nfs_delegation_mark_reclaim(struct nfs_client *clp) |
1da177e4 | 729 | { |
d3978bb3 CL |
730 | struct nfs_server *server; |
731 | ||
8383e460 | 732 | rcu_read_lock(); |
d3978bb3 CL |
733 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) |
734 | nfs_delegation_mark_reclaim_server(server); | |
8383e460 | 735 | rcu_read_unlock(); |
1da177e4 LT |
736 | } |
737 | ||
d3978bb3 CL |
738 | /** |
739 | * nfs_delegation_reap_unclaimed - reap unclaimed delegations after reboot recovery is done | |
740 | * @clp: nfs_client to process | |
741 | * | |
1da177e4 | 742 | */ |
adfa6f98 | 743 | void nfs_delegation_reap_unclaimed(struct nfs_client *clp) |
1da177e4 | 744 | { |
8383e460 | 745 | struct nfs_delegation *delegation; |
d3978bb3 | 746 | struct nfs_server *server; |
86e89489 | 747 | struct inode *inode; |
d3978bb3 | 748 | |
8383e460 TM |
749 | restart: |
750 | rcu_read_lock(); | |
d3978bb3 CL |
751 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { |
752 | list_for_each_entry_rcu(delegation, &server->delegations, | |
753 | super_list) { | |
754 | if (test_bit(NFS_DELEGATION_NEED_RECLAIM, | |
755 | &delegation->flags) == 0) | |
756 | continue; | |
757 | inode = nfs_delegation_grab_inode(delegation); | |
758 | if (inode == NULL) | |
759 | continue; | |
760 | delegation = nfs_detach_delegation(NFS_I(inode), | |
d25be546 | 761 | delegation, server); |
d3978bb3 CL |
762 | rcu_read_unlock(); |
763 | ||
764 | if (delegation != NULL) | |
765 | nfs_free_delegation(delegation); | |
766 | iput(inode); | |
767 | goto restart; | |
768 | } | |
1da177e4 | 769 | } |
8383e460 | 770 | rcu_read_unlock(); |
1da177e4 | 771 | } |
3e4f6290 | 772 | |
d3978bb3 CL |
773 | /** |
774 | * nfs_delegations_present - check for existence of delegations | |
775 | * @clp: client state handle | |
776 | * | |
777 | * Returns one if there are any nfs_delegation structures attached | |
778 | * to this nfs_client. | |
779 | */ | |
780 | int nfs_delegations_present(struct nfs_client *clp) | |
781 | { | |
782 | struct nfs_server *server; | |
783 | int ret = 0; | |
784 | ||
785 | rcu_read_lock(); | |
786 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
787 | if (!list_empty(&server->delegations)) { | |
788 | ret = 1; | |
789 | break; | |
790 | } | |
791 | rcu_read_unlock(); | |
792 | return ret; | |
793 | } | |
794 | ||
795 | /** | |
796 | * nfs4_copy_delegation_stateid - Copy inode's state ID information | |
797 | * @dst: stateid data structure to fill in | |
798 | * @inode: inode to check | |
0032a7a7 | 799 | * @flags: delegation type requirement |
d3978bb3 | 800 | * |
0032a7a7 TM |
801 | * Returns "true" and fills in "dst->data" * if inode had a delegation, |
802 | * otherwise "false" is returned. | |
d3978bb3 | 803 | */ |
0032a7a7 TM |
804 | bool nfs4_copy_delegation_stateid(nfs4_stateid *dst, struct inode *inode, |
805 | fmode_t flags) | |
3e4f6290 | 806 | { |
3e4f6290 TM |
807 | struct nfs_inode *nfsi = NFS_I(inode); |
808 | struct nfs_delegation *delegation; | |
0032a7a7 | 809 | bool ret; |
3e4f6290 | 810 | |
0032a7a7 | 811 | flags &= FMODE_READ|FMODE_WRITE; |
8383e460 TM |
812 | rcu_read_lock(); |
813 | delegation = rcu_dereference(nfsi->delegation); | |
0032a7a7 TM |
814 | ret = (delegation != NULL && (delegation->type & flags) == flags); |
815 | if (ret) { | |
f597c537 | 816 | nfs4_stateid_copy(dst, &delegation->stateid); |
0032a7a7 | 817 | nfs_mark_delegation_referenced(delegation); |
3e4f6290 | 818 | } |
8383e460 TM |
819 | rcu_read_unlock(); |
820 | return ret; | |
3e4f6290 | 821 | } |