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 | |
3f09df70 | 73 | if (inode->i_flock == NULL) |
65b62a29 | 74 | return 0; |
3f09df70 | 75 | |
65b62a29 TM |
76 | if (inode->i_flock == NULL) |
77 | goto out; | |
b89f4321 AB |
78 | /* Protect inode->i_flock using the file locks lock */ |
79 | lock_flocks(); | |
90dc7d27 | 80 | for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) { |
888e694c TM |
81 | if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK))) |
82 | continue; | |
cd3758e3 | 83 | if (nfs_file_open_context(fl->fl_file) != ctx) |
888e694c | 84 | continue; |
b89f4321 | 85 | unlock_flocks(); |
db4f2e63 | 86 | status = nfs4_lock_delegation_recall(fl, state, stateid); |
d5122201 | 87 | if (status < 0) |
3f09df70 | 88 | goto out; |
b89f4321 | 89 | lock_flocks(); |
888e694c | 90 | } |
b89f4321 | 91 | unlock_flocks(); |
3f09df70 | 92 | out: |
888e694c TM |
93 | return status; |
94 | } | |
95 | ||
d18cc1fd | 96 | static int nfs_delegation_claim_opens(struct inode *inode, const nfs4_stateid *stateid) |
1da177e4 LT |
97 | { |
98 | struct nfs_inode *nfsi = NFS_I(inode); | |
99 | struct nfs_open_context *ctx; | |
d25be546 | 100 | struct nfs4_state_owner *sp; |
1da177e4 | 101 | struct nfs4_state *state; |
d25be546 | 102 | unsigned int seq; |
888e694c | 103 | int err; |
1da177e4 LT |
104 | |
105 | again: | |
106 | spin_lock(&inode->i_lock); | |
107 | list_for_each_entry(ctx, &nfsi->open_files, list) { | |
108 | state = ctx->state; | |
109 | if (state == NULL) | |
110 | continue; | |
111 | if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) | |
112 | continue; | |
f597c537 | 113 | if (!nfs4_stateid_match(&state->stateid, stateid)) |
90163027 | 114 | continue; |
1da177e4 LT |
115 | get_nfs_open_context(ctx); |
116 | spin_unlock(&inode->i_lock); | |
d25be546 | 117 | sp = state->owner; |
65b62a29 TM |
118 | /* Block nfs4_proc_unlck */ |
119 | mutex_lock(&sp->so_delegreturn_mutex); | |
d25be546 | 120 | seq = raw_seqcount_begin(&sp->so_reclaim_seqcount); |
13437e12 | 121 | err = nfs4_open_delegation_recall(ctx, state, stateid); |
d25be546 | 122 | if (!err) |
db4f2e63 | 123 | err = nfs_delegation_claim_locks(ctx, state, stateid); |
d25be546 TM |
124 | if (!err && read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) |
125 | err = -EAGAIN; | |
65b62a29 | 126 | mutex_unlock(&sp->so_delegreturn_mutex); |
1da177e4 | 127 | put_nfs_open_context(ctx); |
888e694c | 128 | if (err != 0) |
d18cc1fd | 129 | return err; |
1da177e4 LT |
130 | goto again; |
131 | } | |
132 | spin_unlock(&inode->i_lock); | |
d18cc1fd | 133 | return 0; |
1da177e4 LT |
134 | } |
135 | ||
d3978bb3 CL |
136 | /** |
137 | * nfs_inode_reclaim_delegation - process a delegation reclaim request | |
138 | * @inode: inode to process | |
139 | * @cred: credential to use for request | |
140 | * @res: new delegation state from server | |
141 | * | |
1da177e4 | 142 | */ |
d3978bb3 CL |
143 | void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, |
144 | struct nfs_openres *res) | |
1da177e4 | 145 | { |
8f649c37 TM |
146 | struct nfs_delegation *delegation; |
147 | struct rpc_cred *oldcred = NULL; | |
1da177e4 | 148 | |
8f649c37 TM |
149 | rcu_read_lock(); |
150 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
151 | if (delegation != NULL) { | |
152 | spin_lock(&delegation->lock); | |
153 | if (delegation->inode != NULL) { | |
f597c537 | 154 | nfs4_stateid_copy(&delegation->stateid, &res->delegation); |
8f649c37 TM |
155 | delegation->type = res->delegation_type; |
156 | delegation->maxsize = res->maxsize; | |
157 | oldcred = delegation->cred; | |
158 | delegation->cred = get_rpccred(cred); | |
159 | clear_bit(NFS_DELEGATION_NEED_RECLAIM, | |
160 | &delegation->flags); | |
161 | NFS_I(inode)->delegation_state = delegation->type; | |
162 | spin_unlock(&delegation->lock); | |
163 | put_rpccred(oldcred); | |
164 | rcu_read_unlock(); | |
165 | } else { | |
166 | /* We appear to have raced with a delegation return. */ | |
167 | spin_unlock(&delegation->lock); | |
168 | rcu_read_unlock(); | |
169 | nfs_inode_set_delegation(inode, cred, res); | |
170 | } | |
171 | } else { | |
172 | rcu_read_unlock(); | |
173 | } | |
1da177e4 LT |
174 | } |
175 | ||
57bfa891 TM |
176 | static int nfs_do_return_delegation(struct inode *inode, struct nfs_delegation *delegation, int issync) |
177 | { | |
178 | int res = 0; | |
179 | ||
180 | res = nfs4_proc_delegreturn(inode, delegation->cred, &delegation->stateid, issync); | |
181 | nfs_free_delegation(delegation); | |
182 | return res; | |
183 | } | |
184 | ||
86e89489 TM |
185 | static struct inode *nfs_delegation_grab_inode(struct nfs_delegation *delegation) |
186 | { | |
187 | struct inode *inode = NULL; | |
188 | ||
189 | spin_lock(&delegation->lock); | |
190 | if (delegation->inode != NULL) | |
191 | inode = igrab(delegation->inode); | |
192 | spin_unlock(&delegation->lock); | |
193 | return inode; | |
194 | } | |
195 | ||
d25be546 TM |
196 | static struct nfs_delegation * |
197 | nfs_start_delegation_return_locked(struct nfs_inode *nfsi) | |
198 | { | |
199 | struct nfs_delegation *ret = NULL; | |
200 | struct nfs_delegation *delegation = rcu_dereference(nfsi->delegation); | |
201 | ||
202 | if (delegation == NULL) | |
203 | goto out; | |
204 | spin_lock(&delegation->lock); | |
205 | if (!test_and_set_bit(NFS_DELEGATION_RETURNING, &delegation->flags)) | |
206 | ret = delegation; | |
207 | spin_unlock(&delegation->lock); | |
208 | out: | |
209 | return ret; | |
210 | } | |
211 | ||
212 | static struct nfs_delegation * | |
213 | nfs_start_delegation_return(struct nfs_inode *nfsi) | |
214 | { | |
215 | struct nfs_delegation *delegation; | |
216 | ||
217 | rcu_read_lock(); | |
218 | delegation = nfs_start_delegation_return_locked(nfsi); | |
219 | rcu_read_unlock(); | |
220 | return delegation; | |
221 | } | |
222 | ||
223 | static void | |
224 | nfs_abort_delegation_return(struct nfs_delegation *delegation, | |
225 | struct nfs_client *clp) | |
226 | { | |
227 | ||
228 | spin_lock(&delegation->lock); | |
229 | clear_bit(NFS_DELEGATION_RETURNING, &delegation->flags); | |
230 | set_bit(NFS_DELEGATION_RETURN, &delegation->flags); | |
231 | spin_unlock(&delegation->lock); | |
232 | set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state); | |
233 | } | |
234 | ||
dda4b225 CL |
235 | static struct nfs_delegation * |
236 | nfs_detach_delegation_locked(struct nfs_inode *nfsi, | |
d25be546 TM |
237 | struct nfs_delegation *delegation, |
238 | struct nfs_client *clp) | |
57bfa891 | 239 | { |
d25be546 | 240 | struct nfs_delegation *deleg_cur = |
17d2c0a0 | 241 | rcu_dereference_protected(nfsi->delegation, |
d25be546 | 242 | lockdep_is_held(&clp->cl_lock)); |
57bfa891 | 243 | |
d25be546 TM |
244 | if (deleg_cur == NULL || delegation != deleg_cur) |
245 | return NULL; | |
dda4b225 | 246 | |
34310430 | 247 | spin_lock(&delegation->lock); |
d25be546 | 248 | set_bit(NFS_DELEGATION_RETURNING, &delegation->flags); |
57bfa891 | 249 | list_del_rcu(&delegation->super_list); |
86e89489 | 250 | delegation->inode = NULL; |
57bfa891 TM |
251 | nfsi->delegation_state = 0; |
252 | rcu_assign_pointer(nfsi->delegation, NULL); | |
34310430 | 253 | spin_unlock(&delegation->lock); |
57bfa891 | 254 | return delegation; |
57bfa891 TM |
255 | } |
256 | ||
dda4b225 | 257 | static struct nfs_delegation *nfs_detach_delegation(struct nfs_inode *nfsi, |
d25be546 TM |
258 | struct nfs_delegation *delegation, |
259 | struct nfs_server *server) | |
dda4b225 | 260 | { |
d3978bb3 | 261 | struct nfs_client *clp = server->nfs_client; |
dda4b225 CL |
262 | |
263 | spin_lock(&clp->cl_lock); | |
d25be546 | 264 | delegation = nfs_detach_delegation_locked(nfsi, delegation, clp); |
dda4b225 CL |
265 | spin_unlock(&clp->cl_lock); |
266 | return delegation; | |
267 | } | |
268 | ||
d25be546 TM |
269 | static struct nfs_delegation * |
270 | nfs_inode_detach_delegation(struct inode *inode) | |
271 | { | |
272 | struct nfs_inode *nfsi = NFS_I(inode); | |
273 | struct nfs_server *server = NFS_SERVER(inode); | |
274 | struct nfs_delegation *delegation; | |
275 | ||
276 | delegation = nfs_start_delegation_return(nfsi); | |
277 | if (delegation == NULL) | |
278 | return NULL; | |
279 | return nfs_detach_delegation(nfsi, delegation, server); | |
280 | } | |
281 | ||
d3978bb3 CL |
282 | /** |
283 | * nfs_inode_set_delegation - set up a delegation on an inode | |
284 | * @inode: inode to which delegation applies | |
285 | * @cred: cred to use for subsequent delegation processing | |
286 | * @res: new delegation state from server | |
287 | * | |
288 | * Returns zero on success, or a negative errno value. | |
1da177e4 LT |
289 | */ |
290 | int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res) | |
291 | { | |
d3978bb3 CL |
292 | struct nfs_server *server = NFS_SERVER(inode); |
293 | struct nfs_client *clp = server->nfs_client; | |
1da177e4 | 294 | struct nfs_inode *nfsi = NFS_I(inode); |
17d2c0a0 | 295 | struct nfs_delegation *delegation, *old_delegation; |
57bfa891 | 296 | struct nfs_delegation *freeme = NULL; |
1da177e4 LT |
297 | int status = 0; |
298 | ||
8535b2be | 299 | delegation = kmalloc(sizeof(*delegation), GFP_NOFS); |
1da177e4 LT |
300 | if (delegation == NULL) |
301 | return -ENOMEM; | |
f597c537 | 302 | nfs4_stateid_copy(&delegation->stateid, &res->delegation); |
1da177e4 LT |
303 | delegation->type = res->delegation_type; |
304 | delegation->maxsize = res->maxsize; | |
a9a4a87a | 305 | delegation->change_attr = inode->i_version; |
1da177e4 LT |
306 | delegation->cred = get_rpccred(cred); |
307 | delegation->inode = inode; | |
b7391f44 | 308 | delegation->flags = 1<<NFS_DELEGATION_REFERENCED; |
34310430 | 309 | spin_lock_init(&delegation->lock); |
1da177e4 LT |
310 | |
311 | spin_lock(&clp->cl_lock); | |
17d2c0a0 | 312 | old_delegation = rcu_dereference_protected(nfsi->delegation, |
d3978bb3 | 313 | lockdep_is_held(&clp->cl_lock)); |
17d2c0a0 | 314 | if (old_delegation != NULL) { |
f597c537 TM |
315 | if (nfs4_stateid_match(&delegation->stateid, |
316 | &old_delegation->stateid) && | |
17d2c0a0 | 317 | delegation->type == old_delegation->type) { |
57bfa891 | 318 | goto out; |
1da177e4 | 319 | } |
57bfa891 TM |
320 | /* |
321 | * Deal with broken servers that hand out two | |
322 | * delegations for the same file. | |
17280175 TM |
323 | * Allow for upgrades to a WRITE delegation, but |
324 | * nothing else. | |
57bfa891 TM |
325 | */ |
326 | dfprintk(FILE, "%s: server %s handed out " | |
327 | "a duplicate delegation!\n", | |
3110ff80 | 328 | __func__, clp->cl_hostname); |
17280175 TM |
329 | if (delegation->type == old_delegation->type || |
330 | !(delegation->type & FMODE_WRITE)) { | |
57bfa891 TM |
331 | freeme = delegation; |
332 | delegation = NULL; | |
333 | goto out; | |
334 | } | |
d25be546 TM |
335 | freeme = nfs_detach_delegation_locked(nfsi, |
336 | old_delegation, clp); | |
337 | if (freeme == NULL) | |
338 | goto out; | |
1da177e4 | 339 | } |
d3978bb3 | 340 | list_add_rcu(&delegation->super_list, &server->delegations); |
57bfa891 TM |
341 | nfsi->delegation_state = delegation->type; |
342 | rcu_assign_pointer(nfsi->delegation, delegation); | |
343 | delegation = NULL; | |
412c77ce TM |
344 | |
345 | /* Ensure we revalidate the attributes and page cache! */ | |
346 | spin_lock(&inode->i_lock); | |
347 | nfsi->cache_validity |= NFS_INO_REVAL_FORCED; | |
348 | spin_unlock(&inode->i_lock); | |
349 | ||
57bfa891 | 350 | out: |
1da177e4 | 351 | spin_unlock(&clp->cl_lock); |
603c83da TM |
352 | if (delegation != NULL) |
353 | nfs_free_delegation(delegation); | |
57bfa891 TM |
354 | if (freeme != NULL) |
355 | nfs_do_return_delegation(inode, freeme, 0); | |
1da177e4 LT |
356 | return status; |
357 | } | |
358 | ||
1da177e4 LT |
359 | /* |
360 | * Basic procedure for returning a delegation to the server | |
361 | */ | |
d25be546 | 362 | static int nfs_end_delegation_return(struct inode *inode, struct nfs_delegation *delegation, int issync) |
1da177e4 | 363 | { |
d25be546 | 364 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; |
1da177e4 | 365 | struct nfs_inode *nfsi = NFS_I(inode); |
d18cc1fd | 366 | int err; |
1da177e4 | 367 | |
d25be546 TM |
368 | if (delegation == NULL) |
369 | return 0; | |
370 | do { | |
371 | err = nfs_delegation_claim_opens(inode, &delegation->stateid); | |
372 | if (!issync || err != -EAGAIN) | |
373 | break; | |
374 | /* | |
375 | * Guard against state recovery | |
376 | */ | |
377 | err = nfs4_wait_clnt_recover(clp); | |
378 | } while (err == 0); | |
379 | ||
380 | if (err) { | |
381 | nfs_abort_delegation_return(delegation, clp); | |
382 | goto out; | |
383 | } | |
384 | if (!nfs_detach_delegation(nfsi, delegation, NFS_SERVER(inode))) | |
d18cc1fd | 385 | goto out; |
1da177e4 | 386 | |
d18cc1fd TM |
387 | err = nfs_do_return_delegation(inode, delegation, issync); |
388 | out: | |
389 | return err; | |
90163027 TM |
390 | } |
391 | ||
b757144f TM |
392 | static bool nfs_delegation_need_return(struct nfs_delegation *delegation) |
393 | { | |
394 | bool ret = false; | |
395 | ||
396 | if (test_and_clear_bit(NFS_DELEGATION_RETURN, &delegation->flags)) | |
397 | ret = true; | |
398 | if (test_and_clear_bit(NFS_DELEGATION_RETURN_IF_CLOSED, &delegation->flags) && !ret) { | |
399 | struct inode *inode; | |
400 | ||
401 | spin_lock(&delegation->lock); | |
402 | inode = delegation->inode; | |
403 | if (inode && list_empty(&NFS_I(inode)->open_files)) | |
404 | ret = true; | |
405 | spin_unlock(&delegation->lock); | |
406 | } | |
407 | return ret; | |
408 | } | |
409 | ||
d3978bb3 CL |
410 | /** |
411 | * nfs_client_return_marked_delegations - return previously marked delegations | |
412 | * @clp: nfs_client to process | |
413 | * | |
dc327ed4 TM |
414 | * Note that this function is designed to be called by the state |
415 | * manager thread. For this reason, it cannot flush the dirty data, | |
416 | * since that could deadlock in case of a state recovery error. | |
417 | * | |
d3978bb3 | 418 | * Returns zero on success, or a negative errno value. |
515d8611 | 419 | */ |
d18cc1fd | 420 | int nfs_client_return_marked_delegations(struct nfs_client *clp) |
515d8611 TM |
421 | { |
422 | struct nfs_delegation *delegation; | |
d3978bb3 | 423 | struct nfs_server *server; |
515d8611 | 424 | struct inode *inode; |
d18cc1fd | 425 | int err = 0; |
515d8611 TM |
426 | |
427 | restart: | |
428 | rcu_read_lock(); | |
d3978bb3 CL |
429 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { |
430 | list_for_each_entry_rcu(delegation, &server->delegations, | |
431 | super_list) { | |
b757144f | 432 | if (!nfs_delegation_need_return(delegation)) |
d3978bb3 CL |
433 | continue; |
434 | inode = nfs_delegation_grab_inode(delegation); | |
435 | if (inode == NULL) | |
436 | continue; | |
d25be546 | 437 | delegation = nfs_start_delegation_return_locked(NFS_I(inode)); |
d3978bb3 CL |
438 | rcu_read_unlock(); |
439 | ||
d25be546 | 440 | err = nfs_end_delegation_return(inode, delegation, 0); |
d3978bb3 CL |
441 | iput(inode); |
442 | if (!err) | |
443 | goto restart; | |
444 | set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state); | |
445 | return err; | |
d18cc1fd | 446 | } |
515d8611 TM |
447 | } |
448 | rcu_read_unlock(); | |
d18cc1fd | 449 | return 0; |
515d8611 TM |
450 | } |
451 | ||
d3978bb3 CL |
452 | /** |
453 | * nfs_inode_return_delegation_noreclaim - return delegation, don't reclaim opens | |
454 | * @inode: inode to process | |
455 | * | |
456 | * Does not protect against delegation reclaims, therefore really only safe | |
457 | * to be called from nfs4_clear_inode(). | |
e6f81075 TM |
458 | */ |
459 | void nfs_inode_return_delegation_noreclaim(struct inode *inode) | |
460 | { | |
e6f81075 TM |
461 | struct nfs_delegation *delegation; |
462 | ||
d25be546 TM |
463 | delegation = nfs_inode_detach_delegation(inode); |
464 | if (delegation != NULL) | |
465 | nfs_do_return_delegation(inode, delegation, 0); | |
e6f81075 TM |
466 | } |
467 | ||
d3978bb3 CL |
468 | /** |
469 | * nfs_inode_return_delegation - synchronously return a delegation | |
470 | * @inode: inode to process | |
471 | * | |
c57d1bc5 TM |
472 | * This routine will always flush any dirty data to disk on the |
473 | * assumption that if we need to return the delegation, then | |
474 | * we should stop caching. | |
475 | * | |
d3978bb3 CL |
476 | * Returns zero on success, or a negative errno value. |
477 | */ | |
57ec14c5 | 478 | int nfs4_inode_return_delegation(struct inode *inode) |
90163027 | 479 | { |
90163027 TM |
480 | struct nfs_inode *nfsi = NFS_I(inode); |
481 | struct nfs_delegation *delegation; | |
482 | int err = 0; | |
483 | ||
c57d1bc5 | 484 | nfs_wb_all(inode); |
d25be546 TM |
485 | delegation = nfs_start_delegation_return(nfsi); |
486 | if (delegation != NULL) | |
487 | err = nfs_end_delegation_return(inode, delegation, 1); | |
90163027 | 488 | return err; |
1da177e4 LT |
489 | } |
490 | ||
b757144f TM |
491 | static void nfs_mark_return_if_closed_delegation(struct nfs_server *server, |
492 | struct nfs_delegation *delegation) | |
493 | { | |
494 | set_bit(NFS_DELEGATION_RETURN_IF_CLOSED, &delegation->flags); | |
495 | set_bit(NFS4CLNT_DELEGRETURN, &server->nfs_client->cl_state); | |
496 | } | |
497 | ||
ed1e6211 TM |
498 | static void nfs_mark_return_delegation(struct nfs_server *server, |
499 | struct nfs_delegation *delegation) | |
6411bd4a TM |
500 | { |
501 | set_bit(NFS_DELEGATION_RETURN, &delegation->flags); | |
ed1e6211 | 502 | set_bit(NFS4CLNT_DELEGRETURN, &server->nfs_client->cl_state); |
6411bd4a TM |
503 | } |
504 | ||
5c31e236 TM |
505 | static bool nfs_server_mark_return_all_delegations(struct nfs_server *server) |
506 | { | |
507 | struct nfs_delegation *delegation; | |
508 | bool ret = false; | |
509 | ||
510 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { | |
511 | nfs_mark_return_delegation(server, delegation); | |
512 | ret = true; | |
513 | } | |
514 | return ret; | |
515 | } | |
516 | ||
b02ba0b6 TM |
517 | static void nfs_client_mark_return_all_delegations(struct nfs_client *clp) |
518 | { | |
519 | struct nfs_server *server; | |
520 | ||
521 | rcu_read_lock(); | |
522 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
523 | nfs_server_mark_return_all_delegations(server); | |
524 | rcu_read_unlock(); | |
525 | } | |
526 | ||
527 | static void nfs_delegation_run_state_manager(struct nfs_client *clp) | |
528 | { | |
529 | if (test_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) | |
530 | nfs4_schedule_state_manager(clp); | |
531 | } | |
532 | ||
533 | /** | |
534 | * nfs_expire_all_delegations | |
535 | * @clp: client to process | |
536 | * | |
537 | */ | |
538 | void nfs_expire_all_delegations(struct nfs_client *clp) | |
539 | { | |
540 | nfs_client_mark_return_all_delegations(clp); | |
541 | nfs_delegation_run_state_manager(clp); | |
542 | } | |
543 | ||
d3978bb3 CL |
544 | /** |
545 | * nfs_super_return_all_delegations - return delegations for one superblock | |
546 | * @sb: sb to process | |
547 | * | |
1da177e4 | 548 | */ |
eeebf916 | 549 | void nfs_server_return_all_delegations(struct nfs_server *server) |
1da177e4 | 550 | { |
d3978bb3 | 551 | struct nfs_client *clp = server->nfs_client; |
5c31e236 | 552 | bool need_wait; |
1da177e4 LT |
553 | |
554 | if (clp == NULL) | |
555 | return; | |
d3978bb3 | 556 | |
8383e460 | 557 | rcu_read_lock(); |
5c31e236 | 558 | need_wait = nfs_server_mark_return_all_delegations(server); |
8383e460 | 559 | rcu_read_unlock(); |
d3978bb3 | 560 | |
5c31e236 | 561 | if (need_wait) { |
d18cc1fd | 562 | nfs4_schedule_state_manager(clp); |
5c31e236 TM |
563 | nfs4_wait_clnt_recover(clp); |
564 | } | |
515d8611 TM |
565 | } |
566 | ||
826e0013 | 567 | static void nfs_mark_return_unused_delegation_types(struct nfs_server *server, |
d3978bb3 | 568 | fmode_t flags) |
515d8611 TM |
569 | { |
570 | struct nfs_delegation *delegation; | |
571 | ||
d3978bb3 | 572 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { |
c79571a5 AB |
573 | if ((delegation->type == (FMODE_READ|FMODE_WRITE)) && !(flags & FMODE_WRITE)) |
574 | continue; | |
575 | if (delegation->type & flags) | |
826e0013 | 576 | nfs_mark_return_if_closed_delegation(server, delegation); |
707fb4b3 | 577 | } |
d3978bb3 CL |
578 | } |
579 | ||
826e0013 | 580 | static void nfs_client_mark_return_unused_delegation_types(struct nfs_client *clp, |
d3978bb3 CL |
581 | fmode_t flags) |
582 | { | |
583 | struct nfs_server *server; | |
584 | ||
585 | rcu_read_lock(); | |
586 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
826e0013 | 587 | nfs_mark_return_unused_delegation_types(server, flags); |
515d8611 | 588 | rcu_read_unlock(); |
1da177e4 LT |
589 | } |
590 | ||
a1d0b5ee TM |
591 | void nfs_remove_bad_delegation(struct inode *inode) |
592 | { | |
593 | struct nfs_delegation *delegation; | |
594 | ||
d25be546 | 595 | delegation = nfs_inode_detach_delegation(inode); |
a1d0b5ee TM |
596 | if (delegation) { |
597 | nfs_inode_find_state_and_recover(inode, &delegation->stateid); | |
598 | nfs_free_delegation(delegation); | |
599 | } | |
600 | } | |
9cb81968 | 601 | EXPORT_SYMBOL_GPL(nfs_remove_bad_delegation); |
a1d0b5ee | 602 | |
d3978bb3 | 603 | /** |
826e0013 | 604 | * nfs_expire_unused_delegation_types |
d3978bb3 CL |
605 | * @clp: client to process |
606 | * @flags: delegation types to expire | |
607 | * | |
608 | */ | |
826e0013 | 609 | void nfs_expire_unused_delegation_types(struct nfs_client *clp, fmode_t flags) |
58d9714a | 610 | { |
826e0013 | 611 | nfs_client_mark_return_unused_delegation_types(clp, flags); |
b0d3ded1 | 612 | nfs_delegation_run_state_manager(clp); |
58d9714a TM |
613 | } |
614 | ||
d3978bb3 | 615 | static void nfs_mark_return_unreferenced_delegations(struct nfs_server *server) |
b7391f44 TM |
616 | { |
617 | struct nfs_delegation *delegation; | |
618 | ||
d3978bb3 | 619 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { |
b7391f44 TM |
620 | if (test_and_clear_bit(NFS_DELEGATION_REFERENCED, &delegation->flags)) |
621 | continue; | |
b757144f | 622 | nfs_mark_return_if_closed_delegation(server, delegation); |
b7391f44 | 623 | } |
b7391f44 TM |
624 | } |
625 | ||
d3978bb3 CL |
626 | /** |
627 | * nfs_expire_unreferenced_delegations - Eliminate unused delegations | |
628 | * @clp: nfs_client to process | |
629 | * | |
630 | */ | |
b7391f44 TM |
631 | void nfs_expire_unreferenced_delegations(struct nfs_client *clp) |
632 | { | |
d3978bb3 CL |
633 | struct nfs_server *server; |
634 | ||
635 | rcu_read_lock(); | |
636 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
637 | nfs_mark_return_unreferenced_delegations(server); | |
638 | rcu_read_unlock(); | |
639 | ||
b7391f44 TM |
640 | nfs_delegation_run_state_manager(clp); |
641 | } | |
642 | ||
d3978bb3 CL |
643 | /** |
644 | * nfs_async_inode_return_delegation - asynchronously return a delegation | |
645 | * @inode: inode to process | |
8e663f0e | 646 | * @stateid: state ID information |
d3978bb3 CL |
647 | * |
648 | * Returns zero on success, or a negative errno value. | |
1da177e4 | 649 | */ |
d3978bb3 CL |
650 | int nfs_async_inode_return_delegation(struct inode *inode, |
651 | const nfs4_stateid *stateid) | |
1da177e4 | 652 | { |
ed1e6211 TM |
653 | struct nfs_server *server = NFS_SERVER(inode); |
654 | struct nfs_client *clp = server->nfs_client; | |
6411bd4a | 655 | struct nfs_delegation *delegation; |
1da177e4 | 656 | |
dc327ed4 TM |
657 | filemap_flush(inode->i_mapping); |
658 | ||
6411bd4a TM |
659 | rcu_read_lock(); |
660 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
2597641d | 661 | |
36281caa | 662 | if (!clp->cl_mvops->match_stateid(&delegation->stateid, stateid)) { |
6411bd4a TM |
663 | rcu_read_unlock(); |
664 | return -ENOENT; | |
665 | } | |
ed1e6211 | 666 | nfs_mark_return_delegation(server, delegation); |
6411bd4a | 667 | rcu_read_unlock(); |
d3978bb3 | 668 | |
6411bd4a TM |
669 | nfs_delegation_run_state_manager(clp); |
670 | return 0; | |
1da177e4 LT |
671 | } |
672 | ||
d3978bb3 CL |
673 | static struct inode * |
674 | nfs_delegation_find_inode_server(struct nfs_server *server, | |
675 | const struct nfs_fh *fhandle) | |
1da177e4 LT |
676 | { |
677 | struct nfs_delegation *delegation; | |
678 | struct inode *res = NULL; | |
d3978bb3 CL |
679 | |
680 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { | |
86e89489 TM |
681 | spin_lock(&delegation->lock); |
682 | if (delegation->inode != NULL && | |
683 | nfs_compare_fh(fhandle, &NFS_I(delegation->inode)->fh) == 0) { | |
1da177e4 | 684 | res = igrab(delegation->inode); |
1da177e4 | 685 | } |
86e89489 TM |
686 | spin_unlock(&delegation->lock); |
687 | if (res != NULL) | |
688 | break; | |
1da177e4 | 689 | } |
d3978bb3 CL |
690 | return res; |
691 | } | |
692 | ||
693 | /** | |
694 | * nfs_delegation_find_inode - retrieve the inode associated with a delegation | |
695 | * @clp: client state handle | |
696 | * @fhandle: filehandle from a delegation recall | |
697 | * | |
698 | * Returns pointer to inode matching "fhandle," or NULL if a matching inode | |
699 | * cannot be found. | |
700 | */ | |
701 | struct inode *nfs_delegation_find_inode(struct nfs_client *clp, | |
702 | const struct nfs_fh *fhandle) | |
703 | { | |
704 | struct nfs_server *server; | |
705 | struct inode *res = NULL; | |
706 | ||
707 | rcu_read_lock(); | |
708 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { | |
709 | res = nfs_delegation_find_inode_server(server, fhandle); | |
710 | if (res != NULL) | |
711 | break; | |
712 | } | |
8383e460 | 713 | rcu_read_unlock(); |
1da177e4 LT |
714 | return res; |
715 | } | |
716 | ||
d3978bb3 CL |
717 | static void nfs_delegation_mark_reclaim_server(struct nfs_server *server) |
718 | { | |
719 | struct nfs_delegation *delegation; | |
720 | ||
721 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) | |
722 | set_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags); | |
723 | } | |
724 | ||
725 | /** | |
726 | * nfs_delegation_mark_reclaim - mark all delegations as needing to be reclaimed | |
727 | * @clp: nfs_client to process | |
728 | * | |
1da177e4 | 729 | */ |
adfa6f98 | 730 | void nfs_delegation_mark_reclaim(struct nfs_client *clp) |
1da177e4 | 731 | { |
d3978bb3 CL |
732 | struct nfs_server *server; |
733 | ||
8383e460 | 734 | rcu_read_lock(); |
d3978bb3 CL |
735 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) |
736 | nfs_delegation_mark_reclaim_server(server); | |
8383e460 | 737 | rcu_read_unlock(); |
1da177e4 LT |
738 | } |
739 | ||
d3978bb3 CL |
740 | /** |
741 | * nfs_delegation_reap_unclaimed - reap unclaimed delegations after reboot recovery is done | |
742 | * @clp: nfs_client to process | |
743 | * | |
1da177e4 | 744 | */ |
adfa6f98 | 745 | void nfs_delegation_reap_unclaimed(struct nfs_client *clp) |
1da177e4 | 746 | { |
8383e460 | 747 | struct nfs_delegation *delegation; |
d3978bb3 | 748 | struct nfs_server *server; |
86e89489 | 749 | struct inode *inode; |
d3978bb3 | 750 | |
8383e460 TM |
751 | restart: |
752 | rcu_read_lock(); | |
d3978bb3 CL |
753 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { |
754 | list_for_each_entry_rcu(delegation, &server->delegations, | |
755 | super_list) { | |
756 | if (test_bit(NFS_DELEGATION_NEED_RECLAIM, | |
757 | &delegation->flags) == 0) | |
758 | continue; | |
759 | inode = nfs_delegation_grab_inode(delegation); | |
760 | if (inode == NULL) | |
761 | continue; | |
762 | delegation = nfs_detach_delegation(NFS_I(inode), | |
d25be546 | 763 | delegation, server); |
d3978bb3 CL |
764 | rcu_read_unlock(); |
765 | ||
766 | if (delegation != NULL) | |
767 | nfs_free_delegation(delegation); | |
768 | iput(inode); | |
769 | goto restart; | |
770 | } | |
1da177e4 | 771 | } |
8383e460 | 772 | rcu_read_unlock(); |
1da177e4 | 773 | } |
3e4f6290 | 774 | |
d3978bb3 CL |
775 | /** |
776 | * nfs_delegations_present - check for existence of delegations | |
777 | * @clp: client state handle | |
778 | * | |
779 | * Returns one if there are any nfs_delegation structures attached | |
780 | * to this nfs_client. | |
781 | */ | |
782 | int nfs_delegations_present(struct nfs_client *clp) | |
783 | { | |
784 | struct nfs_server *server; | |
785 | int ret = 0; | |
786 | ||
787 | rcu_read_lock(); | |
788 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
789 | if (!list_empty(&server->delegations)) { | |
790 | ret = 1; | |
791 | break; | |
792 | } | |
793 | rcu_read_unlock(); | |
794 | return ret; | |
795 | } | |
796 | ||
797 | /** | |
798 | * nfs4_copy_delegation_stateid - Copy inode's state ID information | |
799 | * @dst: stateid data structure to fill in | |
800 | * @inode: inode to check | |
0032a7a7 | 801 | * @flags: delegation type requirement |
d3978bb3 | 802 | * |
0032a7a7 TM |
803 | * Returns "true" and fills in "dst->data" * if inode had a delegation, |
804 | * otherwise "false" is returned. | |
d3978bb3 | 805 | */ |
0032a7a7 TM |
806 | bool nfs4_copy_delegation_stateid(nfs4_stateid *dst, struct inode *inode, |
807 | fmode_t flags) | |
3e4f6290 | 808 | { |
3e4f6290 TM |
809 | struct nfs_inode *nfsi = NFS_I(inode); |
810 | struct nfs_delegation *delegation; | |
0032a7a7 | 811 | bool ret; |
3e4f6290 | 812 | |
0032a7a7 | 813 | flags &= FMODE_READ|FMODE_WRITE; |
8383e460 TM |
814 | rcu_read_lock(); |
815 | delegation = rcu_dereference(nfsi->delegation); | |
0032a7a7 TM |
816 | ret = (delegation != NULL && (delegation->type & flags) == flags); |
817 | if (ret) { | |
f597c537 | 818 | nfs4_stateid_copy(dst, &delegation->stateid); |
0032a7a7 | 819 | nfs_mark_delegation_referenced(delegation); |
3e4f6290 | 820 | } |
8383e460 TM |
821 | rcu_read_unlock(); |
822 | return ret; | |
3e4f6290 | 823 | } |