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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/fs/nfs/delegation.c | |
3 | * | |
4 | * Copyright (C) 2004 Trond Myklebust | |
5 | * | |
6 | * NFS file delegation management | |
7 | * | |
8 | */ | |
1da177e4 | 9 | #include <linux/completion.h> |
58d9714a | 10 | #include <linux/kthread.h> |
1da177e4 LT |
11 | #include <linux/module.h> |
12 | #include <linux/sched.h> | |
5a0e3ad6 | 13 | #include <linux/slab.h> |
1da177e4 LT |
14 | #include <linux/spinlock.h> |
15 | ||
16 | #include <linux/nfs4.h> | |
17 | #include <linux/nfs_fs.h> | |
18 | #include <linux/nfs_xdr.h> | |
19 | ||
4ce79717 | 20 | #include "nfs4_fs.h" |
1da177e4 | 21 | #include "delegation.h" |
24c8dbbb | 22 | #include "internal.h" |
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 | ||
d3978bb3 CL |
44 | /** |
45 | * nfs_have_delegation - check if inode has a delegation | |
46 | * @inode: inode to check | |
47 | * @flags: delegation types to check for | |
48 | * | |
49 | * Returns one if inode has the indicated delegation, otherwise zero. | |
50 | */ | |
011e2a7f | 51 | int nfs4_have_delegation(struct inode *inode, fmode_t flags) |
b7391f44 TM |
52 | { |
53 | struct nfs_delegation *delegation; | |
54 | int ret = 0; | |
55 | ||
56 | flags &= FMODE_READ|FMODE_WRITE; | |
57 | rcu_read_lock(); | |
58 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
d25be546 TM |
59 | if (delegation != NULL && (delegation->type & flags) == flags && |
60 | !test_bit(NFS_DELEGATION_RETURNING, &delegation->flags)) { | |
b7391f44 TM |
61 | nfs_mark_delegation_referenced(delegation); |
62 | ret = 1; | |
63 | } | |
64 | rcu_read_unlock(); | |
65 | return ret; | |
66 | } | |
67 | ||
db4f2e63 | 68 | static int nfs_delegation_claim_locks(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid) |
888e694c TM |
69 | { |
70 | struct inode *inode = state->inode; | |
71 | struct file_lock *fl; | |
d5122201 | 72 | int status = 0; |
888e694c | 73 | |
65b62a29 TM |
74 | if (inode->i_flock == NULL) |
75 | goto out; | |
314d7cc0 | 76 | |
1c8c601a JL |
77 | /* Protect inode->i_flock using the i_lock */ |
78 | spin_lock(&inode->i_lock); | |
90dc7d27 | 79 | for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) { |
888e694c TM |
80 | if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK))) |
81 | continue; | |
cd3758e3 | 82 | if (nfs_file_open_context(fl->fl_file) != ctx) |
888e694c | 83 | continue; |
1c8c601a | 84 | spin_unlock(&inode->i_lock); |
db4f2e63 | 85 | status = nfs4_lock_delegation_recall(fl, state, stateid); |
d5122201 | 86 | if (status < 0) |
3f09df70 | 87 | goto out; |
1c8c601a | 88 | spin_lock(&inode->i_lock); |
888e694c | 89 | } |
1c8c601a | 90 | spin_unlock(&inode->i_lock); |
3f09df70 | 91 | out: |
888e694c TM |
92 | return status; |
93 | } | |
94 | ||
d18cc1fd | 95 | static int nfs_delegation_claim_opens(struct inode *inode, const nfs4_stateid *stateid) |
1da177e4 LT |
96 | { |
97 | struct nfs_inode *nfsi = NFS_I(inode); | |
98 | struct nfs_open_context *ctx; | |
d25be546 | 99 | struct nfs4_state_owner *sp; |
1da177e4 | 100 | struct nfs4_state *state; |
d25be546 | 101 | unsigned int seq; |
888e694c | 102 | int err; |
1da177e4 LT |
103 | |
104 | again: | |
105 | spin_lock(&inode->i_lock); | |
106 | list_for_each_entry(ctx, &nfsi->open_files, list) { | |
107 | state = ctx->state; | |
108 | if (state == NULL) | |
109 | continue; | |
110 | if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) | |
111 | continue; | |
f597c537 | 112 | if (!nfs4_stateid_match(&state->stateid, stateid)) |
90163027 | 113 | continue; |
1da177e4 LT |
114 | get_nfs_open_context(ctx); |
115 | spin_unlock(&inode->i_lock); | |
d25be546 | 116 | sp = state->owner; |
65b62a29 TM |
117 | /* Block nfs4_proc_unlck */ |
118 | mutex_lock(&sp->so_delegreturn_mutex); | |
d25be546 | 119 | seq = raw_seqcount_begin(&sp->so_reclaim_seqcount); |
13437e12 | 120 | err = nfs4_open_delegation_recall(ctx, state, stateid); |
d25be546 | 121 | if (!err) |
db4f2e63 | 122 | err = nfs_delegation_claim_locks(ctx, state, stateid); |
d25be546 TM |
123 | if (!err && read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) |
124 | err = -EAGAIN; | |
65b62a29 | 125 | mutex_unlock(&sp->so_delegreturn_mutex); |
1da177e4 | 126 | put_nfs_open_context(ctx); |
888e694c | 127 | if (err != 0) |
d18cc1fd | 128 | return err; |
1da177e4 LT |
129 | goto again; |
130 | } | |
131 | spin_unlock(&inode->i_lock); | |
d18cc1fd | 132 | return 0; |
1da177e4 LT |
133 | } |
134 | ||
d3978bb3 CL |
135 | /** |
136 | * nfs_inode_reclaim_delegation - process a delegation reclaim request | |
137 | * @inode: inode to process | |
138 | * @cred: credential to use for request | |
139 | * @res: new delegation state from server | |
140 | * | |
1da177e4 | 141 | */ |
d3978bb3 CL |
142 | void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, |
143 | struct nfs_openres *res) | |
1da177e4 | 144 | { |
8f649c37 TM |
145 | struct nfs_delegation *delegation; |
146 | struct rpc_cred *oldcred = NULL; | |
1da177e4 | 147 | |
8f649c37 TM |
148 | rcu_read_lock(); |
149 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
150 | if (delegation != NULL) { | |
151 | spin_lock(&delegation->lock); | |
152 | if (delegation->inode != NULL) { | |
f597c537 | 153 | nfs4_stateid_copy(&delegation->stateid, &res->delegation); |
8f649c37 TM |
154 | delegation->type = res->delegation_type; |
155 | delegation->maxsize = res->maxsize; | |
156 | oldcred = delegation->cred; | |
157 | delegation->cred = get_rpccred(cred); | |
158 | clear_bit(NFS_DELEGATION_NEED_RECLAIM, | |
159 | &delegation->flags); | |
160 | NFS_I(inode)->delegation_state = delegation->type; | |
161 | spin_unlock(&delegation->lock); | |
162 | put_rpccred(oldcred); | |
163 | rcu_read_unlock(); | |
ca8acf8d | 164 | trace_nfs4_reclaim_delegation(inode, res->delegation_type); |
8f649c37 TM |
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); | |
ca8acf8d | 349 | trace_nfs4_set_delegation(inode, res->delegation_type); |
412c77ce | 350 | |
57bfa891 | 351 | out: |
1da177e4 | 352 | spin_unlock(&clp->cl_lock); |
603c83da TM |
353 | if (delegation != NULL) |
354 | nfs_free_delegation(delegation); | |
57bfa891 TM |
355 | if (freeme != NULL) |
356 | nfs_do_return_delegation(inode, freeme, 0); | |
1da177e4 LT |
357 | return status; |
358 | } | |
359 | ||
1da177e4 LT |
360 | /* |
361 | * Basic procedure for returning a delegation to the server | |
362 | */ | |
d25be546 | 363 | static int nfs_end_delegation_return(struct inode *inode, struct nfs_delegation *delegation, int issync) |
1da177e4 | 364 | { |
d25be546 | 365 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; |
1da177e4 | 366 | struct nfs_inode *nfsi = NFS_I(inode); |
d18cc1fd | 367 | int err; |
1da177e4 | 368 | |
d25be546 TM |
369 | if (delegation == NULL) |
370 | return 0; | |
371 | do { | |
372 | err = nfs_delegation_claim_opens(inode, &delegation->stateid); | |
373 | if (!issync || err != -EAGAIN) | |
374 | break; | |
375 | /* | |
376 | * Guard against state recovery | |
377 | */ | |
378 | err = nfs4_wait_clnt_recover(clp); | |
379 | } while (err == 0); | |
380 | ||
381 | if (err) { | |
382 | nfs_abort_delegation_return(delegation, clp); | |
383 | goto out; | |
384 | } | |
385 | if (!nfs_detach_delegation(nfsi, delegation, NFS_SERVER(inode))) | |
d18cc1fd | 386 | goto out; |
1da177e4 | 387 | |
d18cc1fd TM |
388 | err = nfs_do_return_delegation(inode, delegation, issync); |
389 | out: | |
390 | return err; | |
90163027 TM |
391 | } |
392 | ||
b757144f TM |
393 | static bool nfs_delegation_need_return(struct nfs_delegation *delegation) |
394 | { | |
395 | bool ret = false; | |
396 | ||
397 | if (test_and_clear_bit(NFS_DELEGATION_RETURN, &delegation->flags)) | |
398 | ret = true; | |
399 | if (test_and_clear_bit(NFS_DELEGATION_RETURN_IF_CLOSED, &delegation->flags) && !ret) { | |
400 | struct inode *inode; | |
401 | ||
402 | spin_lock(&delegation->lock); | |
403 | inode = delegation->inode; | |
404 | if (inode && list_empty(&NFS_I(inode)->open_files)) | |
405 | ret = true; | |
406 | spin_unlock(&delegation->lock); | |
407 | } | |
408 | return ret; | |
409 | } | |
410 | ||
d3978bb3 CL |
411 | /** |
412 | * nfs_client_return_marked_delegations - return previously marked delegations | |
413 | * @clp: nfs_client to process | |
414 | * | |
dc327ed4 TM |
415 | * Note that this function is designed to be called by the state |
416 | * manager thread. For this reason, it cannot flush the dirty data, | |
417 | * since that could deadlock in case of a state recovery error. | |
418 | * | |
d3978bb3 | 419 | * Returns zero on success, or a negative errno value. |
515d8611 | 420 | */ |
d18cc1fd | 421 | int nfs_client_return_marked_delegations(struct nfs_client *clp) |
515d8611 TM |
422 | { |
423 | struct nfs_delegation *delegation; | |
d3978bb3 | 424 | struct nfs_server *server; |
515d8611 | 425 | struct inode *inode; |
d18cc1fd | 426 | int err = 0; |
515d8611 TM |
427 | |
428 | restart: | |
429 | rcu_read_lock(); | |
d3978bb3 CL |
430 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { |
431 | list_for_each_entry_rcu(delegation, &server->delegations, | |
432 | super_list) { | |
b757144f | 433 | if (!nfs_delegation_need_return(delegation)) |
d3978bb3 CL |
434 | continue; |
435 | inode = nfs_delegation_grab_inode(delegation); | |
436 | if (inode == NULL) | |
437 | continue; | |
d25be546 | 438 | delegation = nfs_start_delegation_return_locked(NFS_I(inode)); |
d3978bb3 CL |
439 | rcu_read_unlock(); |
440 | ||
d25be546 | 441 | err = nfs_end_delegation_return(inode, delegation, 0); |
d3978bb3 CL |
442 | iput(inode); |
443 | if (!err) | |
444 | goto restart; | |
445 | set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state); | |
446 | return err; | |
d18cc1fd | 447 | } |
515d8611 TM |
448 | } |
449 | rcu_read_unlock(); | |
d18cc1fd | 450 | return 0; |
515d8611 TM |
451 | } |
452 | ||
d3978bb3 CL |
453 | /** |
454 | * nfs_inode_return_delegation_noreclaim - return delegation, don't reclaim opens | |
455 | * @inode: inode to process | |
456 | * | |
457 | * Does not protect against delegation reclaims, therefore really only safe | |
458 | * to be called from nfs4_clear_inode(). | |
e6f81075 TM |
459 | */ |
460 | void nfs_inode_return_delegation_noreclaim(struct inode *inode) | |
461 | { | |
e6f81075 TM |
462 | struct nfs_delegation *delegation; |
463 | ||
d25be546 TM |
464 | delegation = nfs_inode_detach_delegation(inode); |
465 | if (delegation != NULL) | |
466 | nfs_do_return_delegation(inode, delegation, 0); | |
e6f81075 TM |
467 | } |
468 | ||
d3978bb3 CL |
469 | /** |
470 | * nfs_inode_return_delegation - synchronously return a delegation | |
471 | * @inode: inode to process | |
472 | * | |
c57d1bc5 TM |
473 | * This routine will always flush any dirty data to disk on the |
474 | * assumption that if we need to return the delegation, then | |
475 | * we should stop caching. | |
476 | * | |
d3978bb3 CL |
477 | * Returns zero on success, or a negative errno value. |
478 | */ | |
57ec14c5 | 479 | int nfs4_inode_return_delegation(struct inode *inode) |
90163027 | 480 | { |
90163027 TM |
481 | struct nfs_inode *nfsi = NFS_I(inode); |
482 | struct nfs_delegation *delegation; | |
483 | int err = 0; | |
484 | ||
c57d1bc5 | 485 | nfs_wb_all(inode); |
d25be546 TM |
486 | delegation = nfs_start_delegation_return(nfsi); |
487 | if (delegation != NULL) | |
488 | err = nfs_end_delegation_return(inode, delegation, 1); | |
90163027 | 489 | return err; |
1da177e4 LT |
490 | } |
491 | ||
b757144f TM |
492 | static void nfs_mark_return_if_closed_delegation(struct nfs_server *server, |
493 | struct nfs_delegation *delegation) | |
494 | { | |
495 | set_bit(NFS_DELEGATION_RETURN_IF_CLOSED, &delegation->flags); | |
496 | set_bit(NFS4CLNT_DELEGRETURN, &server->nfs_client->cl_state); | |
497 | } | |
498 | ||
ed1e6211 TM |
499 | static void nfs_mark_return_delegation(struct nfs_server *server, |
500 | struct nfs_delegation *delegation) | |
6411bd4a TM |
501 | { |
502 | set_bit(NFS_DELEGATION_RETURN, &delegation->flags); | |
ed1e6211 | 503 | set_bit(NFS4CLNT_DELEGRETURN, &server->nfs_client->cl_state); |
6411bd4a TM |
504 | } |
505 | ||
5c31e236 TM |
506 | static bool nfs_server_mark_return_all_delegations(struct nfs_server *server) |
507 | { | |
508 | struct nfs_delegation *delegation; | |
509 | bool ret = false; | |
510 | ||
511 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { | |
512 | nfs_mark_return_delegation(server, delegation); | |
513 | ret = true; | |
514 | } | |
515 | return ret; | |
516 | } | |
517 | ||
b02ba0b6 TM |
518 | static void nfs_client_mark_return_all_delegations(struct nfs_client *clp) |
519 | { | |
520 | struct nfs_server *server; | |
521 | ||
522 | rcu_read_lock(); | |
523 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
524 | nfs_server_mark_return_all_delegations(server); | |
525 | rcu_read_unlock(); | |
526 | } | |
527 | ||
528 | static void nfs_delegation_run_state_manager(struct nfs_client *clp) | |
529 | { | |
530 | if (test_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) | |
531 | nfs4_schedule_state_manager(clp); | |
532 | } | |
533 | ||
534 | /** | |
535 | * nfs_expire_all_delegations | |
536 | * @clp: client to process | |
537 | * | |
538 | */ | |
539 | void nfs_expire_all_delegations(struct nfs_client *clp) | |
540 | { | |
541 | nfs_client_mark_return_all_delegations(clp); | |
542 | nfs_delegation_run_state_manager(clp); | |
543 | } | |
544 | ||
d3978bb3 CL |
545 | /** |
546 | * nfs_super_return_all_delegations - return delegations for one superblock | |
547 | * @sb: sb to process | |
548 | * | |
1da177e4 | 549 | */ |
eeebf916 | 550 | void nfs_server_return_all_delegations(struct nfs_server *server) |
1da177e4 | 551 | { |
d3978bb3 | 552 | struct nfs_client *clp = server->nfs_client; |
5c31e236 | 553 | bool need_wait; |
1da177e4 LT |
554 | |
555 | if (clp == NULL) | |
556 | return; | |
d3978bb3 | 557 | |
8383e460 | 558 | rcu_read_lock(); |
5c31e236 | 559 | need_wait = nfs_server_mark_return_all_delegations(server); |
8383e460 | 560 | rcu_read_unlock(); |
d3978bb3 | 561 | |
5c31e236 | 562 | if (need_wait) { |
d18cc1fd | 563 | nfs4_schedule_state_manager(clp); |
5c31e236 TM |
564 | nfs4_wait_clnt_recover(clp); |
565 | } | |
515d8611 TM |
566 | } |
567 | ||
826e0013 | 568 | static void nfs_mark_return_unused_delegation_types(struct nfs_server *server, |
d3978bb3 | 569 | fmode_t flags) |
515d8611 TM |
570 | { |
571 | struct nfs_delegation *delegation; | |
572 | ||
d3978bb3 | 573 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { |
c79571a5 AB |
574 | if ((delegation->type == (FMODE_READ|FMODE_WRITE)) && !(flags & FMODE_WRITE)) |
575 | continue; | |
576 | if (delegation->type & flags) | |
826e0013 | 577 | nfs_mark_return_if_closed_delegation(server, delegation); |
707fb4b3 | 578 | } |
d3978bb3 CL |
579 | } |
580 | ||
826e0013 | 581 | static void nfs_client_mark_return_unused_delegation_types(struct nfs_client *clp, |
d3978bb3 CL |
582 | fmode_t flags) |
583 | { | |
584 | struct nfs_server *server; | |
585 | ||
586 | rcu_read_lock(); | |
587 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
826e0013 | 588 | nfs_mark_return_unused_delegation_types(server, flags); |
515d8611 | 589 | rcu_read_unlock(); |
1da177e4 LT |
590 | } |
591 | ||
a1d0b5ee TM |
592 | void nfs_remove_bad_delegation(struct inode *inode) |
593 | { | |
594 | struct nfs_delegation *delegation; | |
595 | ||
d25be546 | 596 | delegation = nfs_inode_detach_delegation(inode); |
a1d0b5ee TM |
597 | if (delegation) { |
598 | nfs_inode_find_state_and_recover(inode, &delegation->stateid); | |
599 | nfs_free_delegation(delegation); | |
600 | } | |
601 | } | |
9cb81968 | 602 | EXPORT_SYMBOL_GPL(nfs_remove_bad_delegation); |
a1d0b5ee | 603 | |
d3978bb3 | 604 | /** |
826e0013 | 605 | * nfs_expire_unused_delegation_types |
d3978bb3 CL |
606 | * @clp: client to process |
607 | * @flags: delegation types to expire | |
608 | * | |
609 | */ | |
826e0013 | 610 | void nfs_expire_unused_delegation_types(struct nfs_client *clp, fmode_t flags) |
58d9714a | 611 | { |
826e0013 | 612 | nfs_client_mark_return_unused_delegation_types(clp, flags); |
b0d3ded1 | 613 | nfs_delegation_run_state_manager(clp); |
58d9714a TM |
614 | } |
615 | ||
d3978bb3 | 616 | static void nfs_mark_return_unreferenced_delegations(struct nfs_server *server) |
b7391f44 TM |
617 | { |
618 | struct nfs_delegation *delegation; | |
619 | ||
d3978bb3 | 620 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { |
b7391f44 TM |
621 | if (test_and_clear_bit(NFS_DELEGATION_REFERENCED, &delegation->flags)) |
622 | continue; | |
b757144f | 623 | nfs_mark_return_if_closed_delegation(server, delegation); |
b7391f44 | 624 | } |
b7391f44 TM |
625 | } |
626 | ||
d3978bb3 CL |
627 | /** |
628 | * nfs_expire_unreferenced_delegations - Eliminate unused delegations | |
629 | * @clp: nfs_client to process | |
630 | * | |
631 | */ | |
b7391f44 TM |
632 | void nfs_expire_unreferenced_delegations(struct nfs_client *clp) |
633 | { | |
d3978bb3 CL |
634 | struct nfs_server *server; |
635 | ||
636 | rcu_read_lock(); | |
637 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
638 | nfs_mark_return_unreferenced_delegations(server); | |
639 | rcu_read_unlock(); | |
640 | ||
b7391f44 TM |
641 | nfs_delegation_run_state_manager(clp); |
642 | } | |
643 | ||
d3978bb3 CL |
644 | /** |
645 | * nfs_async_inode_return_delegation - asynchronously return a delegation | |
646 | * @inode: inode to process | |
8e663f0e | 647 | * @stateid: state ID information |
d3978bb3 CL |
648 | * |
649 | * Returns zero on success, or a negative errno value. | |
1da177e4 | 650 | */ |
d3978bb3 CL |
651 | int nfs_async_inode_return_delegation(struct inode *inode, |
652 | const nfs4_stateid *stateid) | |
1da177e4 | 653 | { |
ed1e6211 TM |
654 | struct nfs_server *server = NFS_SERVER(inode); |
655 | struct nfs_client *clp = server->nfs_client; | |
6411bd4a | 656 | struct nfs_delegation *delegation; |
1da177e4 | 657 | |
dc327ed4 TM |
658 | filemap_flush(inode->i_mapping); |
659 | ||
6411bd4a TM |
660 | rcu_read_lock(); |
661 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
2597641d | 662 | |
36281caa | 663 | if (!clp->cl_mvops->match_stateid(&delegation->stateid, stateid)) { |
6411bd4a TM |
664 | rcu_read_unlock(); |
665 | return -ENOENT; | |
666 | } | |
ed1e6211 | 667 | nfs_mark_return_delegation(server, delegation); |
6411bd4a | 668 | rcu_read_unlock(); |
d3978bb3 | 669 | |
6411bd4a TM |
670 | nfs_delegation_run_state_manager(clp); |
671 | return 0; | |
1da177e4 LT |
672 | } |
673 | ||
d3978bb3 CL |
674 | static struct inode * |
675 | nfs_delegation_find_inode_server(struct nfs_server *server, | |
676 | const struct nfs_fh *fhandle) | |
1da177e4 LT |
677 | { |
678 | struct nfs_delegation *delegation; | |
679 | struct inode *res = NULL; | |
d3978bb3 CL |
680 | |
681 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { | |
86e89489 TM |
682 | spin_lock(&delegation->lock); |
683 | if (delegation->inode != NULL && | |
684 | nfs_compare_fh(fhandle, &NFS_I(delegation->inode)->fh) == 0) { | |
1da177e4 | 685 | res = igrab(delegation->inode); |
1da177e4 | 686 | } |
86e89489 TM |
687 | spin_unlock(&delegation->lock); |
688 | if (res != NULL) | |
689 | break; | |
1da177e4 | 690 | } |
d3978bb3 CL |
691 | return res; |
692 | } | |
693 | ||
694 | /** | |
695 | * nfs_delegation_find_inode - retrieve the inode associated with a delegation | |
696 | * @clp: client state handle | |
697 | * @fhandle: filehandle from a delegation recall | |
698 | * | |
699 | * Returns pointer to inode matching "fhandle," or NULL if a matching inode | |
700 | * cannot be found. | |
701 | */ | |
702 | struct inode *nfs_delegation_find_inode(struct nfs_client *clp, | |
703 | const struct nfs_fh *fhandle) | |
704 | { | |
705 | struct nfs_server *server; | |
706 | struct inode *res = NULL; | |
707 | ||
708 | rcu_read_lock(); | |
709 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { | |
710 | res = nfs_delegation_find_inode_server(server, fhandle); | |
711 | if (res != NULL) | |
712 | break; | |
713 | } | |
8383e460 | 714 | rcu_read_unlock(); |
1da177e4 LT |
715 | return res; |
716 | } | |
717 | ||
d3978bb3 CL |
718 | static void nfs_delegation_mark_reclaim_server(struct nfs_server *server) |
719 | { | |
720 | struct nfs_delegation *delegation; | |
721 | ||
722 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) | |
723 | set_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags); | |
724 | } | |
725 | ||
726 | /** | |
727 | * nfs_delegation_mark_reclaim - mark all delegations as needing to be reclaimed | |
728 | * @clp: nfs_client to process | |
729 | * | |
1da177e4 | 730 | */ |
adfa6f98 | 731 | void nfs_delegation_mark_reclaim(struct nfs_client *clp) |
1da177e4 | 732 | { |
d3978bb3 CL |
733 | struct nfs_server *server; |
734 | ||
8383e460 | 735 | rcu_read_lock(); |
d3978bb3 CL |
736 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) |
737 | nfs_delegation_mark_reclaim_server(server); | |
8383e460 | 738 | rcu_read_unlock(); |
1da177e4 LT |
739 | } |
740 | ||
d3978bb3 CL |
741 | /** |
742 | * nfs_delegation_reap_unclaimed - reap unclaimed delegations after reboot recovery is done | |
743 | * @clp: nfs_client to process | |
744 | * | |
1da177e4 | 745 | */ |
adfa6f98 | 746 | void nfs_delegation_reap_unclaimed(struct nfs_client *clp) |
1da177e4 | 747 | { |
8383e460 | 748 | struct nfs_delegation *delegation; |
d3978bb3 | 749 | struct nfs_server *server; |
86e89489 | 750 | struct inode *inode; |
d3978bb3 | 751 | |
8383e460 TM |
752 | restart: |
753 | rcu_read_lock(); | |
d3978bb3 CL |
754 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { |
755 | list_for_each_entry_rcu(delegation, &server->delegations, | |
756 | super_list) { | |
757 | if (test_bit(NFS_DELEGATION_NEED_RECLAIM, | |
758 | &delegation->flags) == 0) | |
759 | continue; | |
760 | inode = nfs_delegation_grab_inode(delegation); | |
761 | if (inode == NULL) | |
762 | continue; | |
763 | delegation = nfs_detach_delegation(NFS_I(inode), | |
d25be546 | 764 | delegation, server); |
d3978bb3 CL |
765 | rcu_read_unlock(); |
766 | ||
767 | if (delegation != NULL) | |
768 | nfs_free_delegation(delegation); | |
769 | iput(inode); | |
770 | goto restart; | |
771 | } | |
1da177e4 | 772 | } |
8383e460 | 773 | rcu_read_unlock(); |
1da177e4 | 774 | } |
3e4f6290 | 775 | |
d3978bb3 CL |
776 | /** |
777 | * nfs_delegations_present - check for existence of delegations | |
778 | * @clp: client state handle | |
779 | * | |
780 | * Returns one if there are any nfs_delegation structures attached | |
781 | * to this nfs_client. | |
782 | */ | |
783 | int nfs_delegations_present(struct nfs_client *clp) | |
784 | { | |
785 | struct nfs_server *server; | |
786 | int ret = 0; | |
787 | ||
788 | rcu_read_lock(); | |
789 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
790 | if (!list_empty(&server->delegations)) { | |
791 | ret = 1; | |
792 | break; | |
793 | } | |
794 | rcu_read_unlock(); | |
795 | return ret; | |
796 | } | |
797 | ||
798 | /** | |
799 | * nfs4_copy_delegation_stateid - Copy inode's state ID information | |
800 | * @dst: stateid data structure to fill in | |
801 | * @inode: inode to check | |
0032a7a7 | 802 | * @flags: delegation type requirement |
d3978bb3 | 803 | * |
0032a7a7 TM |
804 | * Returns "true" and fills in "dst->data" * if inode had a delegation, |
805 | * otherwise "false" is returned. | |
d3978bb3 | 806 | */ |
0032a7a7 TM |
807 | bool nfs4_copy_delegation_stateid(nfs4_stateid *dst, struct inode *inode, |
808 | fmode_t flags) | |
3e4f6290 | 809 | { |
3e4f6290 TM |
810 | struct nfs_inode *nfsi = NFS_I(inode); |
811 | struct nfs_delegation *delegation; | |
0032a7a7 | 812 | bool ret; |
3e4f6290 | 813 | |
0032a7a7 | 814 | flags &= FMODE_READ|FMODE_WRITE; |
8383e460 TM |
815 | rcu_read_lock(); |
816 | delegation = rcu_dereference(nfsi->delegation); | |
0032a7a7 TM |
817 | ret = (delegation != NULL && (delegation->type & flags) == flags); |
818 | if (ret) { | |
f597c537 | 819 | nfs4_stateid_copy(dst, &delegation->stateid); |
0032a7a7 | 820 | nfs_mark_delegation_referenced(delegation); |
3e4f6290 | 821 | } |
8383e460 TM |
822 | rcu_read_unlock(); |
823 | return ret; | |
3e4f6290 | 824 | } |