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> | |
13 | #include <linux/spinlock.h> | |
14 | ||
15 | #include <linux/nfs4.h> | |
16 | #include <linux/nfs_fs.h> | |
17 | #include <linux/nfs_xdr.h> | |
18 | ||
4ce79717 | 19 | #include "nfs4_fs.h" |
1da177e4 | 20 | #include "delegation.h" |
24c8dbbb | 21 | #include "internal.h" |
1da177e4 | 22 | |
1da177e4 LT |
23 | static void nfs_free_delegation(struct nfs_delegation *delegation) |
24 | { | |
25 | if (delegation->cred) | |
26 | put_rpccred(delegation->cred); | |
27 | kfree(delegation); | |
28 | } | |
29 | ||
888e694c TM |
30 | static int nfs_delegation_claim_locks(struct nfs_open_context *ctx, struct nfs4_state *state) |
31 | { | |
32 | struct inode *inode = state->inode; | |
33 | struct file_lock *fl; | |
34 | int status; | |
35 | ||
36 | for (fl = inode->i_flock; fl != 0; fl = fl->fl_next) { | |
37 | if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK))) | |
38 | continue; | |
39 | if ((struct nfs_open_context *)fl->fl_file->private_data != ctx) | |
40 | continue; | |
41 | status = nfs4_lock_delegation_recall(state, fl); | |
42 | if (status >= 0) | |
43 | continue; | |
44 | switch (status) { | |
45 | default: | |
46 | printk(KERN_ERR "%s: unhandled error %d.\n", | |
47 | __FUNCTION__, status); | |
48 | case -NFS4ERR_EXPIRED: | |
49 | /* kill_proc(fl->fl_pid, SIGLOST, 1); */ | |
50 | case -NFS4ERR_STALE_CLIENTID: | |
7539bbab | 51 | nfs4_schedule_state_recovery(NFS_SERVER(inode)->nfs_client); |
888e694c TM |
52 | goto out_err; |
53 | } | |
54 | } | |
55 | return 0; | |
56 | out_err: | |
57 | return status; | |
58 | } | |
59 | ||
1da177e4 LT |
60 | static void nfs_delegation_claim_opens(struct inode *inode) |
61 | { | |
62 | struct nfs_inode *nfsi = NFS_I(inode); | |
63 | struct nfs_open_context *ctx; | |
64 | struct nfs4_state *state; | |
888e694c | 65 | int err; |
1da177e4 LT |
66 | |
67 | again: | |
68 | spin_lock(&inode->i_lock); | |
69 | list_for_each_entry(ctx, &nfsi->open_files, list) { | |
70 | state = ctx->state; | |
71 | if (state == NULL) | |
72 | continue; | |
73 | if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) | |
74 | continue; | |
75 | get_nfs_open_context(ctx); | |
76 | spin_unlock(&inode->i_lock); | |
888e694c TM |
77 | err = nfs4_open_delegation_recall(ctx->dentry, state); |
78 | if (err >= 0) | |
79 | err = nfs_delegation_claim_locks(ctx, state); | |
1da177e4 | 80 | put_nfs_open_context(ctx); |
888e694c TM |
81 | if (err != 0) |
82 | return; | |
1da177e4 LT |
83 | goto again; |
84 | } | |
85 | spin_unlock(&inode->i_lock); | |
86 | } | |
87 | ||
88 | /* | |
89 | * Set up a delegation on an inode | |
90 | */ | |
91 | void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res) | |
92 | { | |
93 | struct nfs_delegation *delegation = NFS_I(inode)->delegation; | |
94 | ||
95 | if (delegation == NULL) | |
96 | return; | |
97 | memcpy(delegation->stateid.data, res->delegation.data, | |
98 | sizeof(delegation->stateid.data)); | |
99 | delegation->type = res->delegation_type; | |
100 | delegation->maxsize = res->maxsize; | |
101 | put_rpccred(cred); | |
102 | delegation->cred = get_rpccred(cred); | |
103 | delegation->flags &= ~NFS_DELEGATION_NEED_RECLAIM; | |
104 | NFS_I(inode)->delegation_state = delegation->type; | |
105 | smp_wmb(); | |
106 | } | |
107 | ||
108 | /* | |
109 | * Set up a delegation on an inode | |
110 | */ | |
111 | int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res) | |
112 | { | |
7539bbab | 113 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; |
1da177e4 LT |
114 | struct nfs_inode *nfsi = NFS_I(inode); |
115 | struct nfs_delegation *delegation; | |
116 | int status = 0; | |
117 | ||
b3c52da3 TM |
118 | /* Ensure we first revalidate the attributes and page cache! */ |
119 | if ((nfsi->cache_validity & (NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_ATTR))) | |
120 | __nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
121 | ||
f52720ca | 122 | delegation = kmalloc(sizeof(*delegation), GFP_KERNEL); |
1da177e4 LT |
123 | if (delegation == NULL) |
124 | return -ENOMEM; | |
125 | memcpy(delegation->stateid.data, res->delegation.data, | |
126 | sizeof(delegation->stateid.data)); | |
127 | delegation->type = res->delegation_type; | |
128 | delegation->maxsize = res->maxsize; | |
beb2a5ec | 129 | delegation->change_attr = nfsi->change_attr; |
1da177e4 LT |
130 | delegation->cred = get_rpccred(cred); |
131 | delegation->inode = inode; | |
132 | ||
133 | spin_lock(&clp->cl_lock); | |
134 | if (nfsi->delegation == NULL) { | |
135 | list_add(&delegation->super_list, &clp->cl_delegations); | |
136 | nfsi->delegation = delegation; | |
137 | nfsi->delegation_state = delegation->type; | |
138 | delegation = NULL; | |
139 | } else { | |
140 | if (memcmp(&delegation->stateid, &nfsi->delegation->stateid, | |
141 | sizeof(delegation->stateid)) != 0 || | |
142 | delegation->type != nfsi->delegation->type) { | |
143 | printk("%s: server %u.%u.%u.%u, handed out a duplicate delegation!\n", | |
24c8dbbb | 144 | __FUNCTION__, NIPQUAD(clp->cl_addr.sin_addr)); |
1da177e4 LT |
145 | status = -EIO; |
146 | } | |
147 | } | |
148 | spin_unlock(&clp->cl_lock); | |
f99d49ad | 149 | kfree(delegation); |
1da177e4 LT |
150 | return status; |
151 | } | |
152 | ||
153 | static int nfs_do_return_delegation(struct inode *inode, struct nfs_delegation *delegation) | |
154 | { | |
155 | int res = 0; | |
156 | ||
1da177e4 LT |
157 | res = nfs4_proc_delegreturn(inode, delegation->cred, &delegation->stateid); |
158 | nfs_free_delegation(delegation); | |
159 | return res; | |
160 | } | |
161 | ||
162 | /* Sync all data to disk upon delegation return */ | |
163 | static void nfs_msync_inode(struct inode *inode) | |
164 | { | |
165 | filemap_fdatawrite(inode->i_mapping); | |
166 | nfs_wb_all(inode); | |
167 | filemap_fdatawait(inode->i_mapping); | |
168 | } | |
169 | ||
170 | /* | |
171 | * Basic procedure for returning a delegation to the server | |
172 | */ | |
cae7a073 | 173 | int __nfs_inode_return_delegation(struct inode *inode) |
1da177e4 | 174 | { |
7539bbab | 175 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; |
1da177e4 LT |
176 | struct nfs_inode *nfsi = NFS_I(inode); |
177 | struct nfs_delegation *delegation; | |
178 | int res = 0; | |
179 | ||
180 | nfs_msync_inode(inode); | |
181 | down_read(&clp->cl_sem); | |
182 | /* Guard against new delegated open calls */ | |
183 | down_write(&nfsi->rwsem); | |
184 | spin_lock(&clp->cl_lock); | |
185 | delegation = nfsi->delegation; | |
186 | if (delegation != NULL) { | |
187 | list_del_init(&delegation->super_list); | |
188 | nfsi->delegation = NULL; | |
189 | nfsi->delegation_state = 0; | |
190 | } | |
191 | spin_unlock(&clp->cl_lock); | |
192 | nfs_delegation_claim_opens(inode); | |
193 | up_write(&nfsi->rwsem); | |
194 | up_read(&clp->cl_sem); | |
195 | nfs_msync_inode(inode); | |
196 | ||
197 | if (delegation != NULL) | |
198 | res = nfs_do_return_delegation(inode, delegation); | |
199 | return res; | |
200 | } | |
201 | ||
202 | /* | |
203 | * Return all delegations associated to a super block | |
204 | */ | |
205 | void nfs_return_all_delegations(struct super_block *sb) | |
206 | { | |
7539bbab | 207 | struct nfs_client *clp = NFS_SB(sb)->nfs_client; |
1da177e4 LT |
208 | struct nfs_delegation *delegation; |
209 | struct inode *inode; | |
210 | ||
211 | if (clp == NULL) | |
212 | return; | |
213 | restart: | |
214 | spin_lock(&clp->cl_lock); | |
215 | list_for_each_entry(delegation, &clp->cl_delegations, super_list) { | |
216 | if (delegation->inode->i_sb != sb) | |
217 | continue; | |
218 | inode = igrab(delegation->inode); | |
219 | if (inode == NULL) | |
220 | continue; | |
221 | spin_unlock(&clp->cl_lock); | |
222 | nfs_inode_return_delegation(inode); | |
223 | iput(inode); | |
224 | goto restart; | |
225 | } | |
226 | spin_unlock(&clp->cl_lock); | |
227 | } | |
228 | ||
58d9714a TM |
229 | int nfs_do_expire_all_delegations(void *ptr) |
230 | { | |
adfa6f98 | 231 | struct nfs_client *clp = ptr; |
58d9714a TM |
232 | struct nfs_delegation *delegation; |
233 | struct inode *inode; | |
58d9714a TM |
234 | |
235 | allow_signal(SIGKILL); | |
236 | restart: | |
237 | spin_lock(&clp->cl_lock); | |
238 | if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) != 0) | |
239 | goto out; | |
240 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) | |
241 | goto out; | |
242 | list_for_each_entry(delegation, &clp->cl_delegations, super_list) { | |
243 | inode = igrab(delegation->inode); | |
244 | if (inode == NULL) | |
245 | continue; | |
246 | spin_unlock(&clp->cl_lock); | |
26c78e15 | 247 | nfs_inode_return_delegation(inode); |
58d9714a | 248 | iput(inode); |
26c78e15 | 249 | goto restart; |
58d9714a TM |
250 | } |
251 | out: | |
252 | spin_unlock(&clp->cl_lock); | |
24c8dbbb | 253 | nfs_put_client(clp); |
58d9714a TM |
254 | module_put_and_exit(0); |
255 | } | |
256 | ||
adfa6f98 | 257 | void nfs_expire_all_delegations(struct nfs_client *clp) |
58d9714a TM |
258 | { |
259 | struct task_struct *task; | |
260 | ||
261 | __module_get(THIS_MODULE); | |
262 | atomic_inc(&clp->cl_count); | |
263 | task = kthread_run(nfs_do_expire_all_delegations, clp, | |
264 | "%u.%u.%u.%u-delegreturn", | |
24c8dbbb | 265 | NIPQUAD(clp->cl_addr.sin_addr)); |
58d9714a TM |
266 | if (!IS_ERR(task)) |
267 | return; | |
24c8dbbb | 268 | nfs_put_client(clp); |
58d9714a TM |
269 | module_put(THIS_MODULE); |
270 | } | |
271 | ||
1da177e4 LT |
272 | /* |
273 | * Return all delegations following an NFS4ERR_CB_PATH_DOWN error. | |
274 | */ | |
adfa6f98 | 275 | void nfs_handle_cb_pathdown(struct nfs_client *clp) |
1da177e4 LT |
276 | { |
277 | struct nfs_delegation *delegation; | |
278 | struct inode *inode; | |
279 | ||
280 | if (clp == NULL) | |
281 | return; | |
282 | restart: | |
283 | spin_lock(&clp->cl_lock); | |
284 | list_for_each_entry(delegation, &clp->cl_delegations, super_list) { | |
285 | inode = igrab(delegation->inode); | |
286 | if (inode == NULL) | |
287 | continue; | |
288 | spin_unlock(&clp->cl_lock); | |
289 | nfs_inode_return_delegation(inode); | |
290 | iput(inode); | |
291 | goto restart; | |
292 | } | |
293 | spin_unlock(&clp->cl_lock); | |
294 | } | |
295 | ||
296 | struct recall_threadargs { | |
297 | struct inode *inode; | |
adfa6f98 | 298 | struct nfs_client *clp; |
1da177e4 LT |
299 | const nfs4_stateid *stateid; |
300 | ||
301 | struct completion started; | |
302 | int result; | |
303 | }; | |
304 | ||
305 | static int recall_thread(void *data) | |
306 | { | |
307 | struct recall_threadargs *args = (struct recall_threadargs *)data; | |
308 | struct inode *inode = igrab(args->inode); | |
7539bbab | 309 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; |
1da177e4 LT |
310 | struct nfs_inode *nfsi = NFS_I(inode); |
311 | struct nfs_delegation *delegation; | |
312 | ||
313 | daemonize("nfsv4-delegreturn"); | |
314 | ||
315 | nfs_msync_inode(inode); | |
316 | down_read(&clp->cl_sem); | |
317 | down_write(&nfsi->rwsem); | |
318 | spin_lock(&clp->cl_lock); | |
319 | delegation = nfsi->delegation; | |
320 | if (delegation != NULL && memcmp(delegation->stateid.data, | |
321 | args->stateid->data, | |
322 | sizeof(delegation->stateid.data)) == 0) { | |
323 | list_del_init(&delegation->super_list); | |
324 | nfsi->delegation = NULL; | |
325 | nfsi->delegation_state = 0; | |
326 | args->result = 0; | |
327 | } else { | |
328 | delegation = NULL; | |
329 | args->result = -ENOENT; | |
330 | } | |
331 | spin_unlock(&clp->cl_lock); | |
332 | complete(&args->started); | |
333 | nfs_delegation_claim_opens(inode); | |
334 | up_write(&nfsi->rwsem); | |
335 | up_read(&clp->cl_sem); | |
336 | nfs_msync_inode(inode); | |
337 | ||
338 | if (delegation != NULL) | |
339 | nfs_do_return_delegation(inode, delegation); | |
340 | iput(inode); | |
341 | module_put_and_exit(0); | |
342 | } | |
343 | ||
344 | /* | |
345 | * Asynchronous delegation recall! | |
346 | */ | |
347 | int nfs_async_inode_return_delegation(struct inode *inode, const nfs4_stateid *stateid) | |
348 | { | |
349 | struct recall_threadargs data = { | |
350 | .inode = inode, | |
351 | .stateid = stateid, | |
352 | }; | |
353 | int status; | |
354 | ||
355 | init_completion(&data.started); | |
356 | __module_get(THIS_MODULE); | |
357 | status = kernel_thread(recall_thread, &data, CLONE_KERNEL); | |
358 | if (status < 0) | |
359 | goto out_module_put; | |
360 | wait_for_completion(&data.started); | |
361 | return data.result; | |
362 | out_module_put: | |
363 | module_put(THIS_MODULE); | |
364 | return status; | |
365 | } | |
366 | ||
367 | /* | |
368 | * Retrieve the inode associated with a delegation | |
369 | */ | |
adfa6f98 | 370 | struct inode *nfs_delegation_find_inode(struct nfs_client *clp, const struct nfs_fh *fhandle) |
1da177e4 LT |
371 | { |
372 | struct nfs_delegation *delegation; | |
373 | struct inode *res = NULL; | |
374 | spin_lock(&clp->cl_lock); | |
375 | list_for_each_entry(delegation, &clp->cl_delegations, super_list) { | |
376 | if (nfs_compare_fh(fhandle, &NFS_I(delegation->inode)->fh) == 0) { | |
377 | res = igrab(delegation->inode); | |
378 | break; | |
379 | } | |
380 | } | |
381 | spin_unlock(&clp->cl_lock); | |
382 | return res; | |
383 | } | |
384 | ||
385 | /* | |
386 | * Mark all delegations as needing to be reclaimed | |
387 | */ | |
adfa6f98 | 388 | void nfs_delegation_mark_reclaim(struct nfs_client *clp) |
1da177e4 LT |
389 | { |
390 | struct nfs_delegation *delegation; | |
391 | spin_lock(&clp->cl_lock); | |
392 | list_for_each_entry(delegation, &clp->cl_delegations, super_list) | |
393 | delegation->flags |= NFS_DELEGATION_NEED_RECLAIM; | |
394 | spin_unlock(&clp->cl_lock); | |
395 | } | |
396 | ||
397 | /* | |
398 | * Reap all unclaimed delegations after reboot recovery is done | |
399 | */ | |
adfa6f98 | 400 | void nfs_delegation_reap_unclaimed(struct nfs_client *clp) |
1da177e4 LT |
401 | { |
402 | struct nfs_delegation *delegation, *n; | |
403 | LIST_HEAD(head); | |
404 | spin_lock(&clp->cl_lock); | |
405 | list_for_each_entry_safe(delegation, n, &clp->cl_delegations, super_list) { | |
406 | if ((delegation->flags & NFS_DELEGATION_NEED_RECLAIM) == 0) | |
407 | continue; | |
408 | list_move(&delegation->super_list, &head); | |
409 | NFS_I(delegation->inode)->delegation = NULL; | |
410 | NFS_I(delegation->inode)->delegation_state = 0; | |
411 | } | |
412 | spin_unlock(&clp->cl_lock); | |
413 | while(!list_empty(&head)) { | |
414 | delegation = list_entry(head.next, struct nfs_delegation, super_list); | |
415 | list_del(&delegation->super_list); | |
416 | nfs_free_delegation(delegation); | |
417 | } | |
418 | } | |
3e4f6290 TM |
419 | |
420 | int nfs4_copy_delegation_stateid(nfs4_stateid *dst, struct inode *inode) | |
421 | { | |
7539bbab | 422 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; |
3e4f6290 TM |
423 | struct nfs_inode *nfsi = NFS_I(inode); |
424 | struct nfs_delegation *delegation; | |
425 | int res = 0; | |
426 | ||
427 | if (nfsi->delegation_state == 0) | |
428 | return 0; | |
429 | spin_lock(&clp->cl_lock); | |
430 | delegation = nfsi->delegation; | |
431 | if (delegation != NULL) { | |
432 | memcpy(dst->data, delegation->stateid.data, sizeof(dst->data)); | |
433 | res = 1; | |
434 | } | |
435 | spin_unlock(&clp->cl_lock); | |
436 | return res; | |
437 | } |