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1 | /* AFS vnode management |
2 | * |
3 | * Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved. |
4 | * Written by David Howells (dhowells@redhat.com) |
5 | * |
6 | * This program is free software; you can redistribute it and/or |
7 | * modify it under the terms of the GNU General Public License |
8 | * as published by the Free Software Foundation; either version |
9 | * 2 of the License, or (at your option) any later version. |
10 | */ |
11 | |
12 | #include <linux/kernel.h> |
13 | #include <linux/module.h> |
14 | #include <linux/init.h> |
15 | #include <linux/fs.h> |
16 | #include <linux/sched.h> |
17 | #include "internal.h" |
18 | |
19 | #if 0 |
20 | static noinline bool dump_tree_aux(struct rb_node *node, struct rb_node *parent, |
21 | int depth, char lr) |
22 | { |
23 | struct afs_vnode *vnode; |
24 | bool bad = false; |
25 | |
26 | if (!node) |
27 | return false; |
28 | |
29 | if (node->rb_left) |
30 | bad = dump_tree_aux(node->rb_left, node, depth + 2, '/'); |
31 | |
32 | vnode = rb_entry(node, struct afs_vnode, cb_promise); |
33 | _debug("%c %*.*s%c%p {%d}", |
34 | rb_is_red(node) ? 'R' : 'B', |
35 | depth, depth, "", lr, |
36 | vnode, vnode->cb_expires_at); |
37 | if (rb_parent(node) != parent) { |
38 | printk("BAD: %p != %p\n", rb_parent(node), parent); |
39 | bad = true; |
40 | } |
41 | |
42 | if (node->rb_right) |
43 | bad |= dump_tree_aux(node->rb_right, node, depth + 2, '\\'); |
44 | |
45 | return bad; |
46 | } |
47 | |
48 | static noinline void dump_tree(const char *name, struct afs_server *server) |
49 | { |
50 | _enter("%s", name); |
51 | if (dump_tree_aux(server->cb_promises.rb_node, NULL, 0, '-')) |
52 | BUG(); |
53 | } |
54 | #endif |
55 | |
56 | /* |
57 | * insert a vnode into the backing server's vnode tree |
58 | */ |
59 | static void afs_install_vnode(struct afs_vnode *vnode, |
60 | struct afs_server *server) |
61 | { |
62 | struct afs_server *old_server = vnode->server; |
63 | struct afs_vnode *xvnode; |
64 | struct rb_node *parent, **p; |
65 | |
66 | _enter("%p,%p", vnode, server); |
67 | |
68 | if (old_server) { |
69 | spin_lock(&old_server->fs_lock); |
70 | rb_erase(&vnode->server_rb, &old_server->fs_vnodes); |
71 | spin_unlock(&old_server->fs_lock); |
72 | } |
73 | |
74 | afs_get_server(server); |
75 | vnode->server = server; |
76 | afs_put_server(old_server); |
77 | |
78 | /* insert into the server's vnode tree in FID order */ |
79 | spin_lock(&server->fs_lock); |
80 | |
81 | parent = NULL; |
82 | p = &server->fs_vnodes.rb_node; |
83 | while (*p) { |
84 | parent = *p; |
85 | xvnode = rb_entry(parent, struct afs_vnode, server_rb); |
86 | if (vnode->fid.vid < xvnode->fid.vid) |
87 | p = &(*p)->rb_left; |
88 | else if (vnode->fid.vid > xvnode->fid.vid) |
89 | p = &(*p)->rb_right; |
90 | else if (vnode->fid.vnode < xvnode->fid.vnode) |
91 | p = &(*p)->rb_left; |
92 | else if (vnode->fid.vnode > xvnode->fid.vnode) |
93 | p = &(*p)->rb_right; |
94 | else if (vnode->fid.unique < xvnode->fid.unique) |
95 | p = &(*p)->rb_left; |
96 | else if (vnode->fid.unique > xvnode->fid.unique) |
97 | p = &(*p)->rb_right; |
98 | else |
99 | BUG(); /* can't happen unless afs_iget() malfunctions */ |
100 | } |
101 | |
102 | rb_link_node(&vnode->server_rb, parent, p); |
103 | rb_insert_color(&vnode->server_rb, &server->fs_vnodes); |
104 | |
105 | spin_unlock(&server->fs_lock); |
106 | _leave(""); |
107 | } |
108 | |
109 | /* |
110 | * insert a vnode into the promising server's update/expiration tree |
111 | * - caller must hold vnode->lock |
112 | */ |
113 | static void afs_vnode_note_promise(struct afs_vnode *vnode, |
114 | struct afs_server *server) |
115 | { |
116 | struct afs_server *old_server; |
117 | struct afs_vnode *xvnode; |
118 | struct rb_node *parent, **p; |
119 | |
120 | _enter("%p,%p", vnode, server); |
121 | |
122 | ASSERT(server != NULL); |
123 | |
124 | old_server = vnode->server; |
125 | if (vnode->cb_promised) { |
126 | if (server == old_server && |
127 | vnode->cb_expires == vnode->cb_expires_at) { |
128 | _leave(" [no change]"); |
129 | return; |
130 | } |
131 | |
132 | spin_lock(&old_server->cb_lock); |
133 | if (vnode->cb_promised) { |
134 | _debug("delete"); |
135 | rb_erase(&vnode->cb_promise, &old_server->cb_promises); |
136 | vnode->cb_promised = false; |
137 | } |
138 | spin_unlock(&old_server->cb_lock); |
139 | } |
140 | |
141 | if (vnode->server != server) |
142 | afs_install_vnode(vnode, server); |
143 | |
144 | vnode->cb_expires_at = vnode->cb_expires; |
145 | _debug("PROMISE on %p {%lu}", |
146 | vnode, (unsigned long) vnode->cb_expires_at); |
147 | |
148 | /* abuse an RB-tree to hold the expiration order (we may have multiple |
149 | * items with the same expiration time) */ |
150 | spin_lock(&server->cb_lock); |
151 | |
152 | parent = NULL; |
153 | p = &server->cb_promises.rb_node; |
154 | while (*p) { |
155 | parent = *p; |
156 | xvnode = rb_entry(parent, struct afs_vnode, cb_promise); |
157 | if (vnode->cb_expires_at < xvnode->cb_expires_at) |
158 | p = &(*p)->rb_left; |
159 | else |
160 | p = &(*p)->rb_right; |
161 | } |
162 | |
163 | rb_link_node(&vnode->cb_promise, parent, p); |
164 | rb_insert_color(&vnode->cb_promise, &server->cb_promises); |
165 | vnode->cb_promised = true; |
166 | |
167 | spin_unlock(&server->cb_lock); |
168 | _leave(""); |
169 | } |
170 | |
171 | /* |
172 | * handle remote file deletion by discarding the callback promise |
173 | */ |
174 | static void afs_vnode_deleted_remotely(struct afs_vnode *vnode) |
175 | { |
176 | struct afs_server *server; |
177 | |
178 | _enter("{%p}", vnode->server); |
179 | |
180 | set_bit(AFS_VNODE_DELETED, &vnode->flags); |
181 | |
182 | server = vnode->server; |
183 | if (server) { |
184 | if (vnode->cb_promised) { |
185 | spin_lock(&server->cb_lock); |
186 | if (vnode->cb_promised) { |
187 | rb_erase(&vnode->cb_promise, |
188 | &server->cb_promises); |
189 | vnode->cb_promised = false; |
190 | } |
191 | spin_unlock(&server->cb_lock); |
192 | } |
193 | |
194 | spin_lock(&server->fs_lock); |
195 | rb_erase(&vnode->server_rb, &server->fs_vnodes); |
196 | spin_unlock(&server->fs_lock); |
197 | |
198 | vnode->server = NULL; |
199 | afs_put_server(server); |
200 | } else { |
201 | ASSERT(!vnode->cb_promised); |
202 | } |
203 | |
204 | _leave(""); |
205 | } |
206 | |
207 | /* |
208 | * finish off updating the recorded status of a file after a successful |
209 | * operation completion |
210 | * - starts callback expiry timer |
211 | * - adds to server's callback list |
212 | */ |
213 | void afs_vnode_finalise_status_update(struct afs_vnode *vnode, |
214 | struct afs_server *server) |
215 | { |
216 | struct afs_server *oldserver = NULL; |
217 | |
218 | _enter("%p,%p", vnode, server); |
219 | |
220 | spin_lock(&vnode->lock); |
221 | clear_bit(AFS_VNODE_CB_BROKEN, &vnode->flags); |
222 | afs_vnode_note_promise(vnode, server); |
223 | vnode->update_cnt--; |
224 | ASSERTCMP(vnode->update_cnt, >=, 0); |
225 | spin_unlock(&vnode->lock); |
226 | |
227 | wake_up_all(&vnode->update_waitq); |
228 | afs_put_server(oldserver); |
229 | _leave(""); |
230 | } |
231 | |
232 | /* |
233 | * finish off updating the recorded status of a file after an operation failed |
234 | */ |
235 | static void afs_vnode_status_update_failed(struct afs_vnode *vnode, int ret) |
236 | { |
237 | _enter("{%x:%u},%d", vnode->fid.vid, vnode->fid.vnode, ret); |
238 | |
239 | spin_lock(&vnode->lock); |
240 | |
241 | clear_bit(AFS_VNODE_CB_BROKEN, &vnode->flags); |
242 | |
243 | if (ret == -ENOENT) { |
244 | /* the file was deleted on the server */ |
245 | _debug("got NOENT from server - marking file deleted"); |
246 | afs_vnode_deleted_remotely(vnode); |
247 | } |
248 | |
249 | vnode->update_cnt--; |
250 | ASSERTCMP(vnode->update_cnt, >=, 0); |
251 | spin_unlock(&vnode->lock); |
252 | |
253 | wake_up_all(&vnode->update_waitq); |
254 | _leave(""); |
255 | } |
256 | |
257 | /* |
258 | * fetch file status from the volume |
259 | * - don't issue a fetch if: |
260 | * - the changed bit is not set and there's a valid callback |
261 | * - there are any outstanding ops that will fetch the status |
262 | * - TODO implement local caching |
263 | */ |
264 | int afs_vnode_fetch_status(struct afs_vnode *vnode, |
265 | struct afs_vnode *auth_vnode, struct key *key) |
266 | { |
267 | struct afs_server *server; |
268 | unsigned long acl_order; |
269 | int ret; |
270 | |
271 | DECLARE_WAITQUEUE(myself, current); |
272 | |
273 | _enter("%s,{%x:%u.%u}", |
274 | vnode->volume->vlocation->vldb.name, |
275 | vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique); |
276 | |
277 | if (!test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags) && |
278 | vnode->cb_promised) { |
279 | _leave(" [unchanged]"); |
280 | return 0; |
281 | } |
282 | |
283 | if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { |
284 | _leave(" [deleted]"); |
285 | return -ENOENT; |
286 | } |
287 | |
288 | acl_order = 0; |
289 | if (auth_vnode) |
290 | acl_order = auth_vnode->acl_order; |
291 | |
292 | spin_lock(&vnode->lock); |
293 | |
294 | if (!test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags) && |
295 | vnode->cb_promised) { |
296 | spin_unlock(&vnode->lock); |
297 | _leave(" [unchanged]"); |
298 | return 0; |
299 | } |
300 | |
301 | ASSERTCMP(vnode->update_cnt, >=, 0); |
302 | |
303 | if (vnode->update_cnt > 0) { |
304 | /* someone else started a fetch */ |
305 | _debug("wait on fetch %d", vnode->update_cnt); |
306 | |
307 | set_current_state(TASK_UNINTERRUPTIBLE); |
308 | ASSERT(myself.func != NULL); |
309 | add_wait_queue(&vnode->update_waitq, &myself); |
310 | |
311 | /* wait for the status to be updated */ |
312 | for (;;) { |
313 | if (!test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags)) |
314 | break; |
315 | if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) |
316 | break; |
317 | |
318 | /* check to see if it got updated and invalidated all |
319 | * before we saw it */ |
320 | if (vnode->update_cnt == 0) { |
321 | remove_wait_queue(&vnode->update_waitq, |
322 | &myself); |
323 | set_current_state(TASK_RUNNING); |
324 | goto get_anyway; |
325 | } |
326 | |
327 | spin_unlock(&vnode->lock); |
328 | |
329 | schedule(); |
330 | set_current_state(TASK_UNINTERRUPTIBLE); |
331 | |
332 | spin_lock(&vnode->lock); |
333 | } |
334 | |
335 | remove_wait_queue(&vnode->update_waitq, &myself); |
336 | spin_unlock(&vnode->lock); |
337 | set_current_state(TASK_RUNNING); |
338 | |
339 | return test_bit(AFS_VNODE_DELETED, &vnode->flags) ? |
340 | -ENOENT : 0; |
341 | } |
342 | |
343 | get_anyway: |
344 | /* okay... we're going to have to initiate the op */ |
345 | vnode->update_cnt++; |
346 | |
347 | spin_unlock(&vnode->lock); |
348 | |
349 | /* merge AFS status fetches and clear outstanding callback on this |
350 | * vnode */ |
351 | do { |
352 | /* pick a server to query */ |
353 | server = afs_volume_pick_fileserver(vnode); |
354 | if (IS_ERR(server)) |
355 | goto no_server; |
356 | |
357 | _debug("USING SERVER: %p{%08x}", |
358 | server, ntohl(server->addr.s_addr)); |
359 | |
360 | ret = afs_fs_fetch_file_status(server, key, vnode, NULL, |
361 | &afs_sync_call); |
362 | |
363 | } while (!afs_volume_release_fileserver(vnode, server, ret)); |
364 | |
365 | /* adjust the flags */ |
366 | if (ret == 0) { |
367 | _debug("adjust"); |
368 | if (auth_vnode) |
369 | afs_cache_permit(vnode, key, acl_order); |
370 | afs_vnode_finalise_status_update(vnode, server); |
371 | afs_put_server(server); |
372 | } else { |
373 | _debug("failed [%d]", ret); |
374 | afs_vnode_status_update_failed(vnode, ret); |
375 | } |
376 | |
377 | ASSERTCMP(vnode->update_cnt, >=, 0); |
378 | |
379 | _leave(" = %d [cnt %d]", ret, vnode->update_cnt); |
380 | return ret; |
381 | |
382 | no_server: |
383 | spin_lock(&vnode->lock); |
384 | vnode->update_cnt--; |
385 | ASSERTCMP(vnode->update_cnt, >=, 0); |
386 | spin_unlock(&vnode->lock); |
387 | _leave(" = %ld [cnt %d]", PTR_ERR(server), vnode->update_cnt); |
388 | return PTR_ERR(server); |
389 | } |
390 | |
391 | /* |
392 | * fetch file data from the volume |
393 | * - TODO implement caching |
394 | */ |
395 | int afs_vnode_fetch_data(struct afs_vnode *vnode, struct key *key, |
396 | off_t offset, size_t length, struct page *page) |
397 | { |
398 | struct afs_server *server; |
399 | int ret; |
400 | |
401 | _enter("%s{%x:%u.%u},%x,,,", |
402 | vnode->volume->vlocation->vldb.name, |
403 | vnode->fid.vid, |
404 | vnode->fid.vnode, |
405 | vnode->fid.unique, |
406 | key_serial(key)); |
407 | |
408 | /* this op will fetch the status */ |
409 | spin_lock(&vnode->lock); |
410 | vnode->update_cnt++; |
411 | spin_unlock(&vnode->lock); |
412 | |
413 | /* merge in AFS status fetches and clear outstanding callback on this |
414 | * vnode */ |
415 | do { |
416 | /* pick a server to query */ |
417 | server = afs_volume_pick_fileserver(vnode); |
418 | if (IS_ERR(server)) |
419 | goto no_server; |
420 | |
421 | _debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr)); |
422 | |
423 | ret = afs_fs_fetch_data(server, key, vnode, offset, length, |
424 | page, &afs_sync_call); |
425 | |
426 | } while (!afs_volume_release_fileserver(vnode, server, ret)); |
427 | |
428 | /* adjust the flags */ |
429 | if (ret == 0) { |
430 | afs_vnode_finalise_status_update(vnode, server); |
431 | afs_put_server(server); |
432 | } else { |
433 | afs_vnode_status_update_failed(vnode, ret); |
434 | } |
435 | |
436 | _leave(" = %d", ret); |
437 | return ret; |
438 | |
439 | no_server: |
440 | spin_lock(&vnode->lock); |
441 | vnode->update_cnt--; |
442 | ASSERTCMP(vnode->update_cnt, >=, 0); |
443 | spin_unlock(&vnode->lock); |
444 | return PTR_ERR(server); |
445 | } |
446 | |
447 | /* |
448 | * make a file or a directory |
449 | */ |
450 | int afs_vnode_create(struct afs_vnode *vnode, struct key *key, |
451 | const char *name, umode_t mode, struct afs_fid *newfid, |
452 | struct afs_file_status *newstatus, |
453 | struct afs_callback *newcb, struct afs_server **_server) |
454 | { |
455 | struct afs_server *server; |
456 | int ret; |
457 | |
458 | _enter("%s{%x:%u.%u},%x,%s,,", |
459 | vnode->volume->vlocation->vldb.name, |
460 | vnode->fid.vid, |
461 | vnode->fid.vnode, |
462 | vnode->fid.unique, |
463 | key_serial(key), |
464 | name); |
465 | |
466 | /* this op will fetch the status on the directory we're creating in */ |
467 | spin_lock(&vnode->lock); |
468 | vnode->update_cnt++; |
469 | spin_unlock(&vnode->lock); |
470 | |
471 | do { |
472 | /* pick a server to query */ |
473 | server = afs_volume_pick_fileserver(vnode); |
474 | if (IS_ERR(server)) |
475 | goto no_server; |
476 | |
477 | _debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr)); |
478 | |
479 | ret = afs_fs_create(server, key, vnode, name, mode, newfid, |
480 | newstatus, newcb, &afs_sync_call); |
481 | |
482 | } while (!afs_volume_release_fileserver(vnode, server, ret)); |
483 | |
484 | /* adjust the flags */ |
485 | if (ret == 0) { |
486 | afs_vnode_finalise_status_update(vnode, server); |
487 | *_server = server; |
488 | } else { |
489 | afs_vnode_status_update_failed(vnode, ret); |
490 | *_server = NULL; |
491 | } |
492 | |
493 | _leave(" = %d [cnt %d]", ret, vnode->update_cnt); |
494 | return ret; |
495 | |
496 | no_server: |
497 | spin_lock(&vnode->lock); |
498 | vnode->update_cnt--; |
499 | ASSERTCMP(vnode->update_cnt, >=, 0); |
500 | spin_unlock(&vnode->lock); |
501 | _leave(" = %ld [cnt %d]", PTR_ERR(server), vnode->update_cnt); |
502 | return PTR_ERR(server); |
503 | } |
504 | |
505 | /* |
506 | * remove a file or directory |
507 | */ |
508 | int afs_vnode_remove(struct afs_vnode *vnode, struct key *key, const char *name, |
509 | bool isdir) |
510 | { |
511 | struct afs_server *server; |
512 | int ret; |
513 | |
514 | _enter("%s{%x:%u.%u},%x,%s", |
515 | vnode->volume->vlocation->vldb.name, |
516 | vnode->fid.vid, |
517 | vnode->fid.vnode, |
518 | vnode->fid.unique, |
519 | key_serial(key), |
520 | name); |
521 | |
522 | /* this op will fetch the status on the directory we're removing from */ |
523 | spin_lock(&vnode->lock); |
524 | vnode->update_cnt++; |
525 | spin_unlock(&vnode->lock); |
526 | |
527 | do { |
528 | /* pick a server to query */ |
529 | server = afs_volume_pick_fileserver(vnode); |
530 | if (IS_ERR(server)) |
531 | goto no_server; |
532 | |
533 | _debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr)); |
534 | |
535 | ret = afs_fs_remove(server, key, vnode, name, isdir, |
536 | &afs_sync_call); |
537 | |
538 | } while (!afs_volume_release_fileserver(vnode, server, ret)); |
539 | |
540 | /* adjust the flags */ |
541 | if (ret == 0) { |
542 | afs_vnode_finalise_status_update(vnode, server); |
543 | afs_put_server(server); |
544 | } else { |
545 | afs_vnode_status_update_failed(vnode, ret); |
546 | } |
547 | |
548 | _leave(" = %d [cnt %d]", ret, vnode->update_cnt); |
549 | return ret; |
550 | |
551 | no_server: |
552 | spin_lock(&vnode->lock); |
553 | vnode->update_cnt--; |
554 | ASSERTCMP(vnode->update_cnt, >=, 0); |
555 | spin_unlock(&vnode->lock); |
556 | _leave(" = %ld [cnt %d]", PTR_ERR(server), vnode->update_cnt); |
557 | return PTR_ERR(server); |
558 | } |
559 | |
560 | /* |
561 | * create a hard link |
562 | */ |
563 | int afs_vnode_link(struct afs_vnode *dvnode, struct afs_vnode *vnode, |
564 | struct key *key, const char *name) |
565 | { |
566 | struct afs_server *server; |
567 | int ret; |
568 | |
569 | _enter("%s{%x:%u.%u},%s{%x:%u.%u},%x,%s", |
570 | dvnode->volume->vlocation->vldb.name, |
571 | dvnode->fid.vid, |
572 | dvnode->fid.vnode, |
573 | dvnode->fid.unique, |
574 | vnode->volume->vlocation->vldb.name, |
575 | vnode->fid.vid, |
576 | vnode->fid.vnode, |
577 | vnode->fid.unique, |
578 | key_serial(key), |
579 | name); |
580 | |
581 | /* this op will fetch the status on the directory we're removing from */ |
582 | spin_lock(&vnode->lock); |
583 | vnode->update_cnt++; |
584 | spin_unlock(&vnode->lock); |
585 | spin_lock(&dvnode->lock); |
586 | dvnode->update_cnt++; |
587 | spin_unlock(&dvnode->lock); |
588 | |
589 | do { |
590 | /* pick a server to query */ |
591 | server = afs_volume_pick_fileserver(dvnode); |
592 | if (IS_ERR(server)) |
593 | goto no_server; |
594 | |
595 | _debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr)); |
596 | |
597 | ret = afs_fs_link(server, key, dvnode, vnode, name, |
598 | &afs_sync_call); |
599 | |
600 | } while (!afs_volume_release_fileserver(dvnode, server, ret)); |
601 | |
602 | /* adjust the flags */ |
603 | if (ret == 0) { |
604 | afs_vnode_finalise_status_update(vnode, server); |
605 | afs_vnode_finalise_status_update(dvnode, server); |
606 | afs_put_server(server); |
607 | } else { |
608 | afs_vnode_status_update_failed(vnode, ret); |
609 | afs_vnode_status_update_failed(dvnode, ret); |
610 | } |
611 | |
612 | _leave(" = %d [cnt %d]", ret, vnode->update_cnt); |
613 | return ret; |
614 | |
615 | no_server: |
616 | spin_lock(&vnode->lock); |
617 | vnode->update_cnt--; |
618 | ASSERTCMP(vnode->update_cnt, >=, 0); |
619 | spin_unlock(&vnode->lock); |
620 | spin_lock(&dvnode->lock); |
621 | dvnode->update_cnt--; |
622 | ASSERTCMP(dvnode->update_cnt, >=, 0); |
623 | spin_unlock(&dvnode->lock); |
624 | _leave(" = %ld [cnt %d]", PTR_ERR(server), vnode->update_cnt); |
625 | return PTR_ERR(server); |
626 | } |
627 | |
628 | /* |
629 | * create a symbolic link |
630 | */ |
631 | int afs_vnode_symlink(struct afs_vnode *vnode, struct key *key, |
632 | const char *name, const char *content, |
633 | struct afs_fid *newfid, |
634 | struct afs_file_status *newstatus, |
635 | struct afs_server **_server) |
636 | { |
637 | struct afs_server *server; |
638 | int ret; |
639 | |
640 | _enter("%s{%x:%u.%u},%x,%s,%s,,,", |
641 | vnode->volume->vlocation->vldb.name, |
642 | vnode->fid.vid, |
643 | vnode->fid.vnode, |
644 | vnode->fid.unique, |
645 | key_serial(key), |
646 | name, content); |
647 | |
648 | /* this op will fetch the status on the directory we're creating in */ |
649 | spin_lock(&vnode->lock); |
650 | vnode->update_cnt++; |
651 | spin_unlock(&vnode->lock); |
652 | |
653 | do { |
654 | /* pick a server to query */ |
655 | server = afs_volume_pick_fileserver(vnode); |
656 | if (IS_ERR(server)) |
657 | goto no_server; |
658 | |
659 | _debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr)); |
660 | |
661 | ret = afs_fs_symlink(server, key, vnode, name, content, |
662 | newfid, newstatus, &afs_sync_call); |
663 | |
664 | } while (!afs_volume_release_fileserver(vnode, server, ret)); |
665 | |
666 | /* adjust the flags */ |
667 | if (ret == 0) { |
668 | afs_vnode_finalise_status_update(vnode, server); |
669 | *_server = server; |
670 | } else { |
671 | afs_vnode_status_update_failed(vnode, ret); |
672 | *_server = NULL; |
673 | } |
674 | |
675 | _leave(" = %d [cnt %d]", ret, vnode->update_cnt); |
676 | return ret; |
677 | |
678 | no_server: |
679 | spin_lock(&vnode->lock); |
680 | vnode->update_cnt--; |
681 | ASSERTCMP(vnode->update_cnt, >=, 0); |
682 | spin_unlock(&vnode->lock); |
683 | _leave(" = %ld [cnt %d]", PTR_ERR(server), vnode->update_cnt); |
684 | return PTR_ERR(server); |
685 | } |
686 | |
687 | /* |
688 | * rename a file |
689 | */ |
690 | int afs_vnode_rename(struct afs_vnode *orig_dvnode, |
691 | struct afs_vnode *new_dvnode, |
692 | struct key *key, |
693 | const char *orig_name, |
694 | const char *new_name) |
695 | { |
696 | struct afs_server *server; |
697 | int ret; |
698 | |
699 | _enter("%s{%x:%u.%u},%s{%u,%u,%u},%x,%s,%s", |
700 | orig_dvnode->volume->vlocation->vldb.name, |
701 | orig_dvnode->fid.vid, |
702 | orig_dvnode->fid.vnode, |
703 | orig_dvnode->fid.unique, |
704 | new_dvnode->volume->vlocation->vldb.name, |
705 | new_dvnode->fid.vid, |
706 | new_dvnode->fid.vnode, |
707 | new_dvnode->fid.unique, |
708 | key_serial(key), |
709 | orig_name, |
710 | new_name); |
711 | |
712 | /* this op will fetch the status on both the directories we're dealing |
713 | * with */ |
714 | spin_lock(&orig_dvnode->lock); |
715 | orig_dvnode->update_cnt++; |
716 | spin_unlock(&orig_dvnode->lock); |
717 | if (new_dvnode != orig_dvnode) { |
718 | spin_lock(&new_dvnode->lock); |
719 | new_dvnode->update_cnt++; |
720 | spin_unlock(&new_dvnode->lock); |
721 | } |
722 | |
723 | do { |
724 | /* pick a server to query */ |
725 | server = afs_volume_pick_fileserver(orig_dvnode); |
726 | if (IS_ERR(server)) |
727 | goto no_server; |
728 | |
729 | _debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr)); |
730 | |
731 | ret = afs_fs_rename(server, key, orig_dvnode, orig_name, |
732 | new_dvnode, new_name, &afs_sync_call); |
733 | |
734 | } while (!afs_volume_release_fileserver(orig_dvnode, server, ret)); |
735 | |
736 | /* adjust the flags */ |
737 | if (ret == 0) { |
738 | afs_vnode_finalise_status_update(orig_dvnode, server); |
739 | if (new_dvnode != orig_dvnode) |
740 | afs_vnode_finalise_status_update(new_dvnode, server); |
741 | afs_put_server(server); |
742 | } else { |
743 | afs_vnode_status_update_failed(orig_dvnode, ret); |
744 | if (new_dvnode != orig_dvnode) |
745 | afs_vnode_status_update_failed(new_dvnode, ret); |
746 | } |
747 | |
748 | _leave(" = %d [cnt %d]", ret, orig_dvnode->update_cnt); |
749 | return ret; |
750 | |
751 | no_server: |
752 | spin_lock(&orig_dvnode->lock); |
753 | orig_dvnode->update_cnt--; |
754 | ASSERTCMP(orig_dvnode->update_cnt, >=, 0); |
755 | spin_unlock(&orig_dvnode->lock); |
756 | if (new_dvnode != orig_dvnode) { |
757 | spin_lock(&new_dvnode->lock); |
758 | new_dvnode->update_cnt--; |
759 | ASSERTCMP(new_dvnode->update_cnt, >=, 0); |
760 | spin_unlock(&new_dvnode->lock); |
761 | } |
762 | _leave(" = %ld [cnt %d]", PTR_ERR(server), orig_dvnode->update_cnt); |
763 | return PTR_ERR(server); |
764 | } |
765 | |
766 | /* |
767 | * write to a file |
768 | */ |
769 | int afs_vnode_store_data(struct afs_writeback *wb, pgoff_t first, pgoff_t last, |
770 | unsigned offset, unsigned to) |
771 | { |
772 | struct afs_server *server; |
773 | struct afs_vnode *vnode = wb->vnode; |
774 | int ret; |
775 | |
776 | _enter("%s{%x:%u.%u},%x,%lx,%lx,%x,%x", |
777 | vnode->volume->vlocation->vldb.name, |
778 | vnode->fid.vid, |
779 | vnode->fid.vnode, |
780 | vnode->fid.unique, |
781 | key_serial(wb->key), |
782 | first, last, offset, to); |
783 | |
784 | /* this op will fetch the status */ |
785 | spin_lock(&vnode->lock); |
786 | vnode->update_cnt++; |
787 | spin_unlock(&vnode->lock); |
788 | |
789 | do { |
790 | /* pick a server to query */ |
791 | server = afs_volume_pick_fileserver(vnode); |
792 | if (IS_ERR(server)) |
793 | goto no_server; |
794 | |
795 | _debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr)); |
796 | |
797 | ret = afs_fs_store_data(server, wb, first, last, offset, to, |
798 | &afs_sync_call); |
799 | |
800 | } while (!afs_volume_release_fileserver(vnode, server, ret)); |
801 | |
802 | /* adjust the flags */ |
803 | if (ret == 0) { |
804 | afs_vnode_finalise_status_update(vnode, server); |
805 | afs_put_server(server); |
806 | } else { |
807 | afs_vnode_status_update_failed(vnode, ret); |
808 | } |
809 | |
810 | _leave(" = %d", ret); |
811 | return ret; |
812 | |
813 | no_server: |
814 | spin_lock(&vnode->lock); |
815 | vnode->update_cnt--; |
816 | ASSERTCMP(vnode->update_cnt, >=, 0); |
817 | spin_unlock(&vnode->lock); |
818 | return PTR_ERR(server); |
819 | } |
820 | |
821 | /* |
822 | * set the attributes on a file |
823 | */ |
824 | int afs_vnode_setattr(struct afs_vnode *vnode, struct key *key, |
825 | struct iattr *attr) |
826 | { |
827 | struct afs_server *server; |
828 | int ret; |
829 | |
830 | _enter("%s{%x:%u.%u},%x", |
831 | vnode->volume->vlocation->vldb.name, |
832 | vnode->fid.vid, |
833 | vnode->fid.vnode, |
834 | vnode->fid.unique, |
835 | key_serial(key)); |
836 | |
837 | /* this op will fetch the status */ |
838 | spin_lock(&vnode->lock); |
839 | vnode->update_cnt++; |
840 | spin_unlock(&vnode->lock); |
841 | |
842 | do { |
843 | /* pick a server to query */ |
844 | server = afs_volume_pick_fileserver(vnode); |
845 | if (IS_ERR(server)) |
846 | goto no_server; |
847 | |
848 | _debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr)); |
849 | |
850 | ret = afs_fs_setattr(server, key, vnode, attr, &afs_sync_call); |
851 | |
852 | } while (!afs_volume_release_fileserver(vnode, server, ret)); |
853 | |
854 | /* adjust the flags */ |
855 | if (ret == 0) { |
856 | afs_vnode_finalise_status_update(vnode, server); |
857 | afs_put_server(server); |
858 | } else { |
859 | afs_vnode_status_update_failed(vnode, ret); |
860 | } |
861 | |
862 | _leave(" = %d", ret); |
863 | return ret; |
864 | |
865 | no_server: |
866 | spin_lock(&vnode->lock); |
867 | vnode->update_cnt--; |
868 | ASSERTCMP(vnode->update_cnt, >=, 0); |
869 | spin_unlock(&vnode->lock); |
870 | return PTR_ERR(server); |
871 | } |
872 | |
873 | /* |
874 | * get the status of a volume |
875 | */ |
876 | int afs_vnode_get_volume_status(struct afs_vnode *vnode, struct key *key, |
877 | struct afs_volume_status *vs) |
878 | { |
879 | struct afs_server *server; |
880 | int ret; |
881 | |
882 | _enter("%s{%x:%u.%u},%x,", |
883 | vnode->volume->vlocation->vldb.name, |
884 | vnode->fid.vid, |
885 | vnode->fid.vnode, |
886 | vnode->fid.unique, |
887 | key_serial(key)); |
888 | |
889 | do { |
890 | /* pick a server to query */ |
891 | server = afs_volume_pick_fileserver(vnode); |
892 | if (IS_ERR(server)) |
893 | goto no_server; |
894 | |
895 | _debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr)); |
896 | |
897 | ret = afs_fs_get_volume_status(server, key, vnode, vs, &afs_sync_call); |
898 | |
899 | } while (!afs_volume_release_fileserver(vnode, server, ret)); |
900 | |
901 | /* adjust the flags */ |
902 | if (ret == 0) |
903 | afs_put_server(server); |
904 | |
905 | _leave(" = %d", ret); |
906 | return ret; |
907 | |
908 | no_server: |
909 | return PTR_ERR(server); |
910 | } |
911 | |
912 | /* |
913 | * get a lock on a file |
914 | */ |
915 | int afs_vnode_set_lock(struct afs_vnode *vnode, struct key *key, |
916 | afs_lock_type_t type) |
917 | { |
918 | struct afs_server *server; |
919 | int ret; |
920 | |
921 | _enter("%s{%x:%u.%u},%x,%u", |
922 | vnode->volume->vlocation->vldb.name, |
923 | vnode->fid.vid, |
924 | vnode->fid.vnode, |
925 | vnode->fid.unique, |
926 | key_serial(key), type); |
927 | |
928 | do { |
929 | /* pick a server to query */ |
930 | server = afs_volume_pick_fileserver(vnode); |
931 | if (IS_ERR(server)) |
932 | goto no_server; |
933 | |
934 | _debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr)); |
935 | |
936 | ret = afs_fs_set_lock(server, key, vnode, type, &afs_sync_call); |
937 | |
938 | } while (!afs_volume_release_fileserver(vnode, server, ret)); |
939 | |
940 | /* adjust the flags */ |
941 | if (ret == 0) |
942 | afs_put_server(server); |
943 | |
944 | _leave(" = %d", ret); |
945 | return ret; |
946 | |
947 | no_server: |
948 | return PTR_ERR(server); |
949 | } |
950 | |
951 | /* |
952 | * extend a lock on a file |
953 | */ |
954 | int afs_vnode_extend_lock(struct afs_vnode *vnode, struct key *key) |
955 | { |
956 | struct afs_server *server; |
957 | int ret; |
958 | |
959 | _enter("%s{%x:%u.%u},%x", |
960 | vnode->volume->vlocation->vldb.name, |
961 | vnode->fid.vid, |
962 | vnode->fid.vnode, |
963 | vnode->fid.unique, |
964 | key_serial(key)); |
965 | |
966 | do { |
967 | /* pick a server to query */ |
968 | server = afs_volume_pick_fileserver(vnode); |
969 | if (IS_ERR(server)) |
970 | goto no_server; |
971 | |
972 | _debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr)); |
973 | |
974 | ret = afs_fs_extend_lock(server, key, vnode, &afs_sync_call); |
975 | |
976 | } while (!afs_volume_release_fileserver(vnode, server, ret)); |
977 | |
978 | /* adjust the flags */ |
979 | if (ret == 0) |
980 | afs_put_server(server); |
981 | |
982 | _leave(" = %d", ret); |
983 | return ret; |
984 | |
985 | no_server: |
986 | return PTR_ERR(server); |
987 | } |
988 | |
989 | /* |
990 | * release a lock on a file |
991 | */ |
992 | int afs_vnode_release_lock(struct afs_vnode *vnode, struct key *key) |
993 | { |
994 | struct afs_server *server; |
995 | int ret; |
996 | |
997 | _enter("%s{%x:%u.%u},%x", |
998 | vnode->volume->vlocation->vldb.name, |
999 | vnode->fid.vid, |
1000 | vnode->fid.vnode, |
1001 | vnode->fid.unique, |
1002 | key_serial(key)); |
1003 | |
1004 | do { |
1005 | /* pick a server to query */ |
1006 | server = afs_volume_pick_fileserver(vnode); |
1007 | if (IS_ERR(server)) |
1008 | goto no_server; |
1009 | |
1010 | _debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr)); |
1011 | |
1012 | ret = afs_fs_release_lock(server, key, vnode, &afs_sync_call); |
1013 | |
1014 | } while (!afs_volume_release_fileserver(vnode, server, ret)); |
1015 | |
1016 | /* adjust the flags */ |
1017 | if (ret == 0) |
1018 | afs_put_server(server); |
1019 | |
1020 | _leave(" = %d", ret); |
1021 | return ret; |
1022 | |
1023 | no_server: |
1024 | return PTR_ERR(server); |
1025 | } |
1026 |
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javiroman/ks7010
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9