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TOMOYO Linux Cross Reference
Linux/fs/afs/vnode.c

Version: ~ [ linux-5.3-rc5 ] ~ [ linux-5.2.9 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.67 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.139 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.189 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.189 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.72 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
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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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