Commit | Line | Data |
---|---|---|
ec26815a | 1 | /* AFS vnode management |
1da177e4 | 2 | * |
08e0e7c8 | 3 | * Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved. |
1da177e4 LT |
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/slab.h> | |
16 | #include <linux/fs.h> | |
1da177e4 LT |
17 | #include "internal.h" |
18 | ||
08e0e7c8 DH |
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); | |
260a9803 | 33 | _debug("%c %*.*s%c%p {%d}", |
08e0e7c8 DH |
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 | } | |
1da177e4 | 41 | |
08e0e7c8 DH |
42 | if (node->rb_right) |
43 | bad |= dump_tree_aux(node->rb_right, node, depth + 2, '\\'); | |
1da177e4 | 44 | |
08e0e7c8 DH |
45 | return bad; |
46 | } | |
1da177e4 | 47 | |
08e0e7c8 DH |
48 | static noinline void dump_tree(const char *name, struct afs_server *server) |
49 | { | |
260a9803 | 50 | _enter("%s", name); |
08e0e7c8 DH |
51 | if (dump_tree_aux(server->cb_promises.rb_node, NULL, 0, '-')) |
52 | BUG(); | |
53 | } | |
1da177e4 LT |
54 | #endif |
55 | ||
1da177e4 | 56 | /* |
08e0e7c8 | 57 | * insert a vnode into the backing server's vnode tree |
1da177e4 | 58 | */ |
08e0e7c8 DH |
59 | static void afs_install_vnode(struct afs_vnode *vnode, |
60 | struct afs_server *server) | |
1da177e4 | 61 | { |
08e0e7c8 DH |
62 | struct afs_server *old_server = vnode->server; |
63 | struct afs_vnode *xvnode; | |
64 | struct rb_node *parent, **p; | |
1da177e4 | 65 | |
08e0e7c8 | 66 | _enter("%p,%p", vnode, server); |
1da177e4 | 67 | |
08e0e7c8 DH |
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 | } | |
1da177e4 | 73 | |
08e0e7c8 DH |
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 | } | |
1da177e4 | 101 | |
08e0e7c8 DH |
102 | rb_link_node(&vnode->server_rb, parent, p); |
103 | rb_insert_color(&vnode->server_rb, &server->fs_vnodes); | |
1da177e4 | 104 | |
08e0e7c8 DH |
105 | spin_unlock(&server->fs_lock); |
106 | _leave(""); | |
107 | } | |
1da177e4 | 108 | |
08e0e7c8 DH |
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); | |
1da177e4 LT |
139 | } |
140 | ||
08e0e7c8 DH |
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 | } | |
1da177e4 | 162 | |
08e0e7c8 DH |
163 | rb_link_node(&vnode->cb_promise, parent, p); |
164 | rb_insert_color(&vnode->cb_promise, &server->cb_promises); | |
165 | vnode->cb_promised = true; | |
1da177e4 | 166 | |
08e0e7c8 | 167 | spin_unlock(&server->cb_lock); |
1da177e4 | 168 | _leave(""); |
ec26815a | 169 | } |
1da177e4 | 170 | |
08e0e7c8 DH |
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 | set_bit(AFS_VNODE_DELETED, &vnode->flags); | |
179 | ||
180 | server = vnode->server; | |
181 | if (vnode->cb_promised) { | |
182 | spin_lock(&server->cb_lock); | |
183 | if (vnode->cb_promised) { | |
184 | rb_erase(&vnode->cb_promise, &server->cb_promises); | |
185 | vnode->cb_promised = false; | |
186 | } | |
187 | spin_unlock(&server->cb_lock); | |
188 | } | |
189 | ||
260a9803 DH |
190 | spin_lock(&vnode->server->fs_lock); |
191 | rb_erase(&vnode->server_rb, &vnode->server->fs_vnodes); | |
192 | spin_unlock(&vnode->server->fs_lock); | |
193 | ||
194 | vnode->server = NULL; | |
08e0e7c8 DH |
195 | afs_put_server(server); |
196 | } | |
197 | ||
1da177e4 | 198 | /* |
260a9803 DH |
199 | * finish off updating the recorded status of a file after a successful |
200 | * operation completion | |
1da177e4 LT |
201 | * - starts callback expiry timer |
202 | * - adds to server's callback list | |
203 | */ | |
260a9803 DH |
204 | void afs_vnode_finalise_status_update(struct afs_vnode *vnode, |
205 | struct afs_server *server) | |
1da177e4 LT |
206 | { |
207 | struct afs_server *oldserver = NULL; | |
208 | ||
260a9803 DH |
209 | _enter("%p,%p", vnode, server); |
210 | ||
211 | spin_lock(&vnode->lock); | |
212 | clear_bit(AFS_VNODE_CB_BROKEN, &vnode->flags); | |
213 | afs_vnode_note_promise(vnode, server); | |
214 | vnode->update_cnt--; | |
215 | ASSERTCMP(vnode->update_cnt, >=, 0); | |
216 | spin_unlock(&vnode->lock); | |
217 | ||
218 | wake_up_all(&vnode->update_waitq); | |
219 | afs_put_server(oldserver); | |
220 | _leave(""); | |
221 | } | |
222 | ||
223 | /* | |
224 | * finish off updating the recorded status of a file after an operation failed | |
225 | */ | |
226 | static void afs_vnode_status_update_failed(struct afs_vnode *vnode, int ret) | |
227 | { | |
228 | _enter("%p,%d", vnode, ret); | |
1da177e4 LT |
229 | |
230 | spin_lock(&vnode->lock); | |
231 | ||
08e0e7c8 | 232 | clear_bit(AFS_VNODE_CB_BROKEN, &vnode->flags); |
1da177e4 | 233 | |
260a9803 | 234 | if (ret == -ENOENT) { |
08e0e7c8 | 235 | /* the file was deleted on the server */ |
1da177e4 | 236 | _debug("got NOENT from server - marking file deleted"); |
08e0e7c8 | 237 | afs_vnode_deleted_remotely(vnode); |
1da177e4 LT |
238 | } |
239 | ||
240 | vnode->update_cnt--; | |
260a9803 | 241 | ASSERTCMP(vnode->update_cnt, >=, 0); |
1da177e4 LT |
242 | spin_unlock(&vnode->lock); |
243 | ||
244 | wake_up_all(&vnode->update_waitq); | |
1da177e4 | 245 | _leave(""); |
ec26815a | 246 | } |
1da177e4 | 247 | |
1da177e4 LT |
248 | /* |
249 | * fetch file status from the volume | |
250 | * - don't issue a fetch if: | |
251 | * - the changed bit is not set and there's a valid callback | |
252 | * - there are any outstanding ops that will fetch the status | |
253 | * - TODO implement local caching | |
254 | */ | |
00d3b7a4 DH |
255 | int afs_vnode_fetch_status(struct afs_vnode *vnode, |
256 | struct afs_vnode *auth_vnode, struct key *key) | |
1da177e4 LT |
257 | { |
258 | struct afs_server *server; | |
00d3b7a4 | 259 | unsigned long acl_order; |
1da177e4 LT |
260 | int ret; |
261 | ||
262 | DECLARE_WAITQUEUE(myself, current); | |
263 | ||
416351f2 | 264 | _enter("%s,{%x:%u.%u}", |
1da177e4 LT |
265 | vnode->volume->vlocation->vldb.name, |
266 | vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique); | |
267 | ||
08e0e7c8 DH |
268 | if (!test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags) && |
269 | vnode->cb_promised) { | |
1da177e4 LT |
270 | _leave(" [unchanged]"); |
271 | return 0; | |
272 | } | |
273 | ||
08e0e7c8 | 274 | if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { |
1da177e4 LT |
275 | _leave(" [deleted]"); |
276 | return -ENOENT; | |
277 | } | |
278 | ||
00d3b7a4 DH |
279 | acl_order = 0; |
280 | if (auth_vnode) | |
281 | acl_order = auth_vnode->acl_order; | |
282 | ||
1da177e4 LT |
283 | spin_lock(&vnode->lock); |
284 | ||
08e0e7c8 DH |
285 | if (!test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags) && |
286 | vnode->cb_promised) { | |
1da177e4 LT |
287 | spin_unlock(&vnode->lock); |
288 | _leave(" [unchanged]"); | |
289 | return 0; | |
290 | } | |
291 | ||
260a9803 DH |
292 | ASSERTCMP(vnode->update_cnt, >=, 0); |
293 | ||
1da177e4 LT |
294 | if (vnode->update_cnt > 0) { |
295 | /* someone else started a fetch */ | |
260a9803 DH |
296 | _debug("wait on fetch %d", vnode->update_cnt); |
297 | ||
1da177e4 | 298 | set_current_state(TASK_UNINTERRUPTIBLE); |
08e0e7c8 | 299 | ASSERT(myself.func != NULL); |
1da177e4 LT |
300 | add_wait_queue(&vnode->update_waitq, &myself); |
301 | ||
302 | /* wait for the status to be updated */ | |
303 | for (;;) { | |
08e0e7c8 | 304 | if (!test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags)) |
1da177e4 | 305 | break; |
08e0e7c8 | 306 | if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) |
1da177e4 LT |
307 | break; |
308 | ||
08e0e7c8 DH |
309 | /* check to see if it got updated and invalidated all |
310 | * before we saw it */ | |
1da177e4 LT |
311 | if (vnode->update_cnt == 0) { |
312 | remove_wait_queue(&vnode->update_waitq, | |
313 | &myself); | |
314 | set_current_state(TASK_RUNNING); | |
315 | goto get_anyway; | |
316 | } | |
317 | ||
318 | spin_unlock(&vnode->lock); | |
319 | ||
320 | schedule(); | |
321 | set_current_state(TASK_UNINTERRUPTIBLE); | |
322 | ||
323 | spin_lock(&vnode->lock); | |
324 | } | |
325 | ||
326 | remove_wait_queue(&vnode->update_waitq, &myself); | |
327 | spin_unlock(&vnode->lock); | |
328 | set_current_state(TASK_RUNNING); | |
329 | ||
08e0e7c8 DH |
330 | return test_bit(AFS_VNODE_DELETED, &vnode->flags) ? |
331 | -ENOENT : 0; | |
1da177e4 LT |
332 | } |
333 | ||
ec26815a | 334 | get_anyway: |
1da177e4 LT |
335 | /* okay... we're going to have to initiate the op */ |
336 | vnode->update_cnt++; | |
337 | ||
338 | spin_unlock(&vnode->lock); | |
339 | ||
340 | /* merge AFS status fetches and clear outstanding callback on this | |
341 | * vnode */ | |
342 | do { | |
343 | /* pick a server to query */ | |
08e0e7c8 DH |
344 | server = afs_volume_pick_fileserver(vnode); |
345 | if (IS_ERR(server)) | |
260a9803 | 346 | goto no_server; |
1da177e4 | 347 | |
08e0e7c8 DH |
348 | _debug("USING SERVER: %p{%08x}", |
349 | server, ntohl(server->addr.s_addr)); | |
1da177e4 | 350 | |
00d3b7a4 | 351 | ret = afs_fs_fetch_file_status(server, key, vnode, NULL, |
08e0e7c8 | 352 | &afs_sync_call); |
1da177e4 | 353 | |
08e0e7c8 | 354 | } while (!afs_volume_release_fileserver(vnode, server, ret)); |
1da177e4 LT |
355 | |
356 | /* adjust the flags */ | |
260a9803 DH |
357 | if (ret == 0) { |
358 | _debug("adjust"); | |
359 | if (auth_vnode) | |
360 | afs_cache_permit(vnode, key, acl_order); | |
361 | afs_vnode_finalise_status_update(vnode, server); | |
362 | afs_put_server(server); | |
363 | } else { | |
364 | _debug("failed [%d]", ret); | |
365 | afs_vnode_status_update_failed(vnode, ret); | |
366 | } | |
1da177e4 | 367 | |
260a9803 DH |
368 | ASSERTCMP(vnode->update_cnt, >=, 0); |
369 | ||
370 | _leave(" = %d [cnt %d]", ret, vnode->update_cnt); | |
1da177e4 | 371 | return ret; |
260a9803 DH |
372 | |
373 | no_server: | |
374 | spin_lock(&vnode->lock); | |
375 | vnode->update_cnt--; | |
376 | ASSERTCMP(vnode->update_cnt, >=, 0); | |
377 | spin_unlock(&vnode->lock); | |
378 | _leave(" = %ld [cnt %d]", PTR_ERR(server), vnode->update_cnt); | |
379 | return PTR_ERR(server); | |
ec26815a | 380 | } |
1da177e4 | 381 | |
1da177e4 LT |
382 | /* |
383 | * fetch file data from the volume | |
260a9803 | 384 | * - TODO implement caching |
1da177e4 | 385 | */ |
00d3b7a4 DH |
386 | int afs_vnode_fetch_data(struct afs_vnode *vnode, struct key *key, |
387 | off_t offset, size_t length, struct page *page) | |
1da177e4 LT |
388 | { |
389 | struct afs_server *server; | |
390 | int ret; | |
391 | ||
416351f2 | 392 | _enter("%s{%x:%u.%u},%x,,,", |
1da177e4 LT |
393 | vnode->volume->vlocation->vldb.name, |
394 | vnode->fid.vid, | |
395 | vnode->fid.vnode, | |
00d3b7a4 DH |
396 | vnode->fid.unique, |
397 | key_serial(key)); | |
1da177e4 LT |
398 | |
399 | /* this op will fetch the status */ | |
400 | spin_lock(&vnode->lock); | |
401 | vnode->update_cnt++; | |
402 | spin_unlock(&vnode->lock); | |
403 | ||
404 | /* merge in AFS status fetches and clear outstanding callback on this | |
405 | * vnode */ | |
406 | do { | |
407 | /* pick a server to query */ | |
08e0e7c8 DH |
408 | server = afs_volume_pick_fileserver(vnode); |
409 | if (IS_ERR(server)) | |
260a9803 | 410 | goto no_server; |
1da177e4 LT |
411 | |
412 | _debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr)); | |
413 | ||
00d3b7a4 | 414 | ret = afs_fs_fetch_data(server, key, vnode, offset, length, |
260a9803 | 415 | page, &afs_sync_call); |
1da177e4 | 416 | |
08e0e7c8 | 417 | } while (!afs_volume_release_fileserver(vnode, server, ret)); |
1da177e4 LT |
418 | |
419 | /* adjust the flags */ | |
260a9803 DH |
420 | if (ret == 0) { |
421 | afs_vnode_finalise_status_update(vnode, server); | |
422 | afs_put_server(server); | |
423 | } else { | |
424 | afs_vnode_status_update_failed(vnode, ret); | |
425 | } | |
1da177e4 LT |
426 | |
427 | _leave(" = %d", ret); | |
428 | return ret; | |
260a9803 DH |
429 | |
430 | no_server: | |
431 | spin_lock(&vnode->lock); | |
432 | vnode->update_cnt--; | |
433 | ASSERTCMP(vnode->update_cnt, >=, 0); | |
434 | spin_unlock(&vnode->lock); | |
435 | return PTR_ERR(server); | |
436 | } | |
437 | ||
438 | /* | |
439 | * make a file or a directory | |
440 | */ | |
441 | int afs_vnode_create(struct afs_vnode *vnode, struct key *key, | |
442 | const char *name, umode_t mode, struct afs_fid *newfid, | |
443 | struct afs_file_status *newstatus, | |
444 | struct afs_callback *newcb, struct afs_server **_server) | |
445 | { | |
446 | struct afs_server *server; | |
447 | int ret; | |
448 | ||
416351f2 | 449 | _enter("%s{%x:%u.%u},%x,%s,,", |
260a9803 DH |
450 | vnode->volume->vlocation->vldb.name, |
451 | vnode->fid.vid, | |
452 | vnode->fid.vnode, | |
453 | vnode->fid.unique, | |
454 | key_serial(key), | |
455 | name); | |
456 | ||
457 | /* this op will fetch the status on the directory we're creating in */ | |
458 | spin_lock(&vnode->lock); | |
459 | vnode->update_cnt++; | |
460 | spin_unlock(&vnode->lock); | |
461 | ||
462 | do { | |
463 | /* pick a server to query */ | |
464 | server = afs_volume_pick_fileserver(vnode); | |
465 | if (IS_ERR(server)) | |
466 | goto no_server; | |
467 | ||
468 | _debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr)); | |
469 | ||
470 | ret = afs_fs_create(server, key, vnode, name, mode, newfid, | |
471 | newstatus, newcb, &afs_sync_call); | |
472 | ||
473 | } while (!afs_volume_release_fileserver(vnode, server, ret)); | |
474 | ||
475 | /* adjust the flags */ | |
476 | if (ret == 0) { | |
477 | afs_vnode_finalise_status_update(vnode, server); | |
478 | *_server = server; | |
479 | } else { | |
480 | afs_vnode_status_update_failed(vnode, ret); | |
481 | *_server = NULL; | |
482 | } | |
483 | ||
484 | _leave(" = %d [cnt %d]", ret, vnode->update_cnt); | |
485 | return ret; | |
486 | ||
487 | no_server: | |
488 | spin_lock(&vnode->lock); | |
489 | vnode->update_cnt--; | |
490 | ASSERTCMP(vnode->update_cnt, >=, 0); | |
491 | spin_unlock(&vnode->lock); | |
492 | _leave(" = %ld [cnt %d]", PTR_ERR(server), vnode->update_cnt); | |
493 | return PTR_ERR(server); | |
494 | } | |
495 | ||
496 | /* | |
497 | * remove a file or directory | |
498 | */ | |
499 | int afs_vnode_remove(struct afs_vnode *vnode, struct key *key, const char *name, | |
500 | bool isdir) | |
501 | { | |
502 | struct afs_server *server; | |
503 | int ret; | |
504 | ||
416351f2 | 505 | _enter("%s{%x:%u.%u},%x,%s", |
260a9803 DH |
506 | vnode->volume->vlocation->vldb.name, |
507 | vnode->fid.vid, | |
508 | vnode->fid.vnode, | |
509 | vnode->fid.unique, | |
510 | key_serial(key), | |
511 | name); | |
512 | ||
513 | /* this op will fetch the status on the directory we're removing from */ | |
514 | spin_lock(&vnode->lock); | |
515 | vnode->update_cnt++; | |
516 | spin_unlock(&vnode->lock); | |
517 | ||
518 | do { | |
519 | /* pick a server to query */ | |
520 | server = afs_volume_pick_fileserver(vnode); | |
521 | if (IS_ERR(server)) | |
522 | goto no_server; | |
523 | ||
524 | _debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr)); | |
525 | ||
526 | ret = afs_fs_remove(server, key, vnode, name, isdir, | |
527 | &afs_sync_call); | |
528 | ||
529 | } while (!afs_volume_release_fileserver(vnode, server, ret)); | |
530 | ||
531 | /* adjust the flags */ | |
532 | if (ret == 0) { | |
533 | afs_vnode_finalise_status_update(vnode, server); | |
534 | afs_put_server(server); | |
535 | } else { | |
536 | afs_vnode_status_update_failed(vnode, ret); | |
537 | } | |
538 | ||
539 | _leave(" = %d [cnt %d]", ret, vnode->update_cnt); | |
540 | return ret; | |
541 | ||
542 | no_server: | |
543 | spin_lock(&vnode->lock); | |
544 | vnode->update_cnt--; | |
545 | ASSERTCMP(vnode->update_cnt, >=, 0); | |
546 | spin_unlock(&vnode->lock); | |
547 | _leave(" = %ld [cnt %d]", PTR_ERR(server), vnode->update_cnt); | |
548 | return PTR_ERR(server); | |
549 | } | |
550 | ||
551 | /* | |
552 | * create a hard link | |
553 | */ | |
554 | extern int afs_vnode_link(struct afs_vnode *dvnode, struct afs_vnode *vnode, | |
555 | struct key *key, const char *name) | |
556 | { | |
557 | struct afs_server *server; | |
558 | int ret; | |
559 | ||
416351f2 | 560 | _enter("%s{%x:%u.%u},%s{%x:%u.%u},%x,%s", |
260a9803 DH |
561 | dvnode->volume->vlocation->vldb.name, |
562 | dvnode->fid.vid, | |
563 | dvnode->fid.vnode, | |
564 | dvnode->fid.unique, | |
565 | vnode->volume->vlocation->vldb.name, | |
566 | vnode->fid.vid, | |
567 | vnode->fid.vnode, | |
568 | vnode->fid.unique, | |
569 | key_serial(key), | |
570 | name); | |
571 | ||
572 | /* this op will fetch the status on the directory we're removing from */ | |
573 | spin_lock(&vnode->lock); | |
574 | vnode->update_cnt++; | |
575 | spin_unlock(&vnode->lock); | |
576 | spin_lock(&dvnode->lock); | |
577 | dvnode->update_cnt++; | |
578 | spin_unlock(&dvnode->lock); | |
579 | ||
580 | do { | |
581 | /* pick a server to query */ | |
582 | server = afs_volume_pick_fileserver(dvnode); | |
583 | if (IS_ERR(server)) | |
584 | goto no_server; | |
585 | ||
586 | _debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr)); | |
587 | ||
588 | ret = afs_fs_link(server, key, dvnode, vnode, name, | |
589 | &afs_sync_call); | |
590 | ||
591 | } while (!afs_volume_release_fileserver(dvnode, server, ret)); | |
592 | ||
593 | /* adjust the flags */ | |
594 | if (ret == 0) { | |
595 | afs_vnode_finalise_status_update(vnode, server); | |
596 | afs_vnode_finalise_status_update(dvnode, server); | |
597 | afs_put_server(server); | |
598 | } else { | |
599 | afs_vnode_status_update_failed(vnode, ret); | |
600 | afs_vnode_status_update_failed(dvnode, ret); | |
601 | } | |
602 | ||
603 | _leave(" = %d [cnt %d]", ret, vnode->update_cnt); | |
604 | return ret; | |
605 | ||
606 | no_server: | |
607 | spin_lock(&vnode->lock); | |
608 | vnode->update_cnt--; | |
609 | ASSERTCMP(vnode->update_cnt, >=, 0); | |
610 | spin_unlock(&vnode->lock); | |
611 | spin_lock(&dvnode->lock); | |
612 | dvnode->update_cnt--; | |
613 | ASSERTCMP(dvnode->update_cnt, >=, 0); | |
614 | spin_unlock(&dvnode->lock); | |
615 | _leave(" = %ld [cnt %d]", PTR_ERR(server), vnode->update_cnt); | |
616 | return PTR_ERR(server); | |
617 | } | |
618 | ||
619 | /* | |
620 | * create a symbolic link | |
621 | */ | |
622 | int afs_vnode_symlink(struct afs_vnode *vnode, struct key *key, | |
623 | const char *name, const char *content, | |
624 | struct afs_fid *newfid, | |
625 | struct afs_file_status *newstatus, | |
626 | struct afs_server **_server) | |
627 | { | |
628 | struct afs_server *server; | |
629 | int ret; | |
630 | ||
416351f2 | 631 | _enter("%s{%x:%u.%u},%x,%s,%s,,,", |
260a9803 DH |
632 | vnode->volume->vlocation->vldb.name, |
633 | vnode->fid.vid, | |
634 | vnode->fid.vnode, | |
635 | vnode->fid.unique, | |
636 | key_serial(key), | |
637 | name, content); | |
638 | ||
639 | /* this op will fetch the status on the directory we're creating in */ | |
640 | spin_lock(&vnode->lock); | |
641 | vnode->update_cnt++; | |
642 | spin_unlock(&vnode->lock); | |
643 | ||
644 | do { | |
645 | /* pick a server to query */ | |
646 | server = afs_volume_pick_fileserver(vnode); | |
647 | if (IS_ERR(server)) | |
648 | goto no_server; | |
649 | ||
650 | _debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr)); | |
651 | ||
652 | ret = afs_fs_symlink(server, key, vnode, name, content, | |
653 | newfid, newstatus, &afs_sync_call); | |
654 | ||
655 | } while (!afs_volume_release_fileserver(vnode, server, ret)); | |
656 | ||
657 | /* adjust the flags */ | |
658 | if (ret == 0) { | |
659 | afs_vnode_finalise_status_update(vnode, server); | |
660 | *_server = server; | |
661 | } else { | |
662 | afs_vnode_status_update_failed(vnode, ret); | |
663 | *_server = NULL; | |
664 | } | |
665 | ||
666 | _leave(" = %d [cnt %d]", ret, vnode->update_cnt); | |
667 | return ret; | |
668 | ||
669 | no_server: | |
670 | spin_lock(&vnode->lock); | |
671 | vnode->update_cnt--; | |
672 | ASSERTCMP(vnode->update_cnt, >=, 0); | |
673 | spin_unlock(&vnode->lock); | |
674 | _leave(" = %ld [cnt %d]", PTR_ERR(server), vnode->update_cnt); | |
675 | return PTR_ERR(server); | |
676 | } | |
677 | ||
678 | /* | |
679 | * rename a file | |
680 | */ | |
681 | int afs_vnode_rename(struct afs_vnode *orig_dvnode, | |
682 | struct afs_vnode *new_dvnode, | |
683 | struct key *key, | |
684 | const char *orig_name, | |
685 | const char *new_name) | |
686 | { | |
687 | struct afs_server *server; | |
688 | int ret; | |
689 | ||
416351f2 | 690 | _enter("%s{%x:%u.%u},%s{%u,%u,%u},%x,%s,%s", |
260a9803 DH |
691 | orig_dvnode->volume->vlocation->vldb.name, |
692 | orig_dvnode->fid.vid, | |
693 | orig_dvnode->fid.vnode, | |
694 | orig_dvnode->fid.unique, | |
695 | new_dvnode->volume->vlocation->vldb.name, | |
696 | new_dvnode->fid.vid, | |
697 | new_dvnode->fid.vnode, | |
698 | new_dvnode->fid.unique, | |
699 | key_serial(key), | |
700 | orig_name, | |
701 | new_name); | |
702 | ||
703 | /* this op will fetch the status on both the directories we're dealing | |
704 | * with */ | |
705 | spin_lock(&orig_dvnode->lock); | |
706 | orig_dvnode->update_cnt++; | |
707 | spin_unlock(&orig_dvnode->lock); | |
708 | if (new_dvnode != orig_dvnode) { | |
709 | spin_lock(&new_dvnode->lock); | |
710 | new_dvnode->update_cnt++; | |
711 | spin_unlock(&new_dvnode->lock); | |
712 | } | |
713 | ||
714 | do { | |
715 | /* pick a server to query */ | |
716 | server = afs_volume_pick_fileserver(orig_dvnode); | |
717 | if (IS_ERR(server)) | |
718 | goto no_server; | |
719 | ||
720 | _debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr)); | |
721 | ||
722 | ret = afs_fs_rename(server, key, orig_dvnode, orig_name, | |
723 | new_dvnode, new_name, &afs_sync_call); | |
724 | ||
725 | } while (!afs_volume_release_fileserver(orig_dvnode, server, ret)); | |
726 | ||
727 | /* adjust the flags */ | |
728 | if (ret == 0) { | |
729 | afs_vnode_finalise_status_update(orig_dvnode, server); | |
730 | if (new_dvnode != orig_dvnode) | |
731 | afs_vnode_finalise_status_update(new_dvnode, server); | |
732 | afs_put_server(server); | |
733 | } else { | |
734 | afs_vnode_status_update_failed(orig_dvnode, ret); | |
735 | if (new_dvnode != orig_dvnode) | |
736 | afs_vnode_status_update_failed(new_dvnode, ret); | |
737 | } | |
738 | ||
739 | _leave(" = %d [cnt %d]", ret, orig_dvnode->update_cnt); | |
740 | return ret; | |
741 | ||
742 | no_server: | |
743 | spin_lock(&orig_dvnode->lock); | |
744 | orig_dvnode->update_cnt--; | |
745 | ASSERTCMP(orig_dvnode->update_cnt, >=, 0); | |
746 | spin_unlock(&orig_dvnode->lock); | |
747 | if (new_dvnode != orig_dvnode) { | |
748 | spin_lock(&new_dvnode->lock); | |
749 | new_dvnode->update_cnt--; | |
750 | ASSERTCMP(new_dvnode->update_cnt, >=, 0); | |
751 | spin_unlock(&new_dvnode->lock); | |
752 | } | |
753 | _leave(" = %ld [cnt %d]", PTR_ERR(server), orig_dvnode->update_cnt); | |
754 | return PTR_ERR(server); | |
ec26815a | 755 | } |