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16#include <linux/kernel.h>
17#include <linux/module.h>
18#include <linux/init.h>
19#include <linux/fs.h>
20#include <linux/pagemap.h>
21#include <linux/sched.h>
22#include <linux/mount.h>
23#include <linux/namei.h>
24#include <linux/iversion.h>
25#include "internal.h"
26#include "afs_fs.h"
27
28static const struct inode_operations afs_symlink_inode_operations = {
29 .get_link = page_get_link,
30 .listxattr = afs_listxattr,
31};
32
33static noinline void dump_vnode(struct afs_vnode *vnode, struct afs_vnode *parent_vnode)
34{
35 static unsigned long once_only;
36
37 pr_warn("kAFS: AFS vnode with undefined type %u\n",
38 vnode->status.type);
39 pr_warn("kAFS: A=%d m=%o s=%llx v=%llx\n",
40 vnode->status.abort_code,
41 vnode->status.mode,
42 vnode->status.size,
43 vnode->status.data_version);
44 pr_warn("kAFS: vnode %llx:%llx:%x\n",
45 vnode->fid.vid,
46 vnode->fid.vnode,
47 vnode->fid.unique);
48 if (parent_vnode)
49 pr_warn("kAFS: dir %llx:%llx:%x\n",
50 parent_vnode->fid.vid,
51 parent_vnode->fid.vnode,
52 parent_vnode->fid.unique);
53
54 if (!test_and_set_bit(0, &once_only))
55 dump_stack();
56}
57
58
59
60
61
62static void afs_set_i_size(struct afs_vnode *vnode, u64 size)
63{
64 i_size_write(&vnode->vfs_inode, size);
65 vnode->vfs_inode.i_blocks = ((size + 1023) >> 10) << 1;
66}
67
68
69
70
71static int afs_inode_init_from_status(struct afs_vnode *vnode, struct key *key,
72 struct afs_cb_interest *cbi,
73 struct afs_vnode *parent_vnode,
74 struct afs_status_cb *scb)
75{
76 struct afs_cb_interest *old_cbi = NULL;
77 struct afs_file_status *status = &scb->status;
78 struct inode *inode = AFS_VNODE_TO_I(vnode);
79 struct timespec64 t;
80
81 _debug("FS: ft=%d lk=%d sz=%llu ver=%Lu mod=%hu",
82 status->type,
83 status->nlink,
84 (unsigned long long) status->size,
85 status->data_version,
86 status->mode);
87
88 write_seqlock(&vnode->cb_lock);
89
90 vnode->status = *status;
91
92 t = status->mtime_client;
93 inode->i_ctime = t;
94 inode->i_mtime = t;
95 inode->i_atime = t;
96 inode->i_uid = make_kuid(&init_user_ns, status->owner);
97 inode->i_gid = make_kgid(&init_user_ns, status->group);
98 set_nlink(&vnode->vfs_inode, status->nlink);
99
100 switch (status->type) {
101 case AFS_FTYPE_FILE:
102 inode->i_mode = S_IFREG | status->mode;
103 inode->i_op = &afs_file_inode_operations;
104 inode->i_fop = &afs_file_operations;
105 inode->i_mapping->a_ops = &afs_fs_aops;
106 break;
107 case AFS_FTYPE_DIR:
108 inode->i_mode = S_IFDIR | status->mode;
109 inode->i_op = &afs_dir_inode_operations;
110 inode->i_fop = &afs_dir_file_operations;
111 inode->i_mapping->a_ops = &afs_dir_aops;
112 break;
113 case AFS_FTYPE_SYMLINK:
114
115 if ((status->mode & 0777) == 0644) {
116 inode->i_flags |= S_AUTOMOUNT;
117
118 set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags);
119
120 inode->i_mode = S_IFDIR | 0555;
121 inode->i_op = &afs_mntpt_inode_operations;
122 inode->i_fop = &afs_mntpt_file_operations;
123 inode->i_mapping->a_ops = &afs_fs_aops;
124 } else {
125 inode->i_mode = S_IFLNK | status->mode;
126 inode->i_op = &afs_symlink_inode_operations;
127 inode->i_mapping->a_ops = &afs_fs_aops;
128 }
129 inode_nohighmem(inode);
130 break;
131 default:
132 dump_vnode(vnode, parent_vnode);
133 write_sequnlock(&vnode->cb_lock);
134 return afs_protocol_error(NULL, -EBADMSG, afs_eproto_file_type);
135 }
136
137 afs_set_i_size(vnode, status->size);
138
139 vnode->invalid_before = status->data_version;
140 inode_set_iversion_raw(&vnode->vfs_inode, status->data_version);
141
142 if (!scb->have_cb) {
143
144
145 vnode->cb_expires_at = ktime_get_real_seconds();
146 } else {
147 vnode->cb_expires_at = scb->callback.expires_at;
148 old_cbi = rcu_dereference_protected(vnode->cb_interest,
149 lockdep_is_held(&vnode->cb_lock.lock));
150 if (cbi != old_cbi)
151 rcu_assign_pointer(vnode->cb_interest, afs_get_cb_interest(cbi));
152 else
153 old_cbi = NULL;
154 set_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
155 }
156
157 write_sequnlock(&vnode->cb_lock);
158 afs_put_cb_interest(afs_v2net(vnode), old_cbi);
159 return 0;
160}
161
162
163
164
165static void afs_apply_status(struct afs_fs_cursor *fc,
166 struct afs_vnode *vnode,
167 struct afs_status_cb *scb,
168 const afs_dataversion_t *expected_version)
169{
170 struct afs_file_status *status = &scb->status;
171 struct timespec64 t;
172 umode_t mode;
173 bool data_changed = false;
174
175 BUG_ON(test_bit(AFS_VNODE_UNSET, &vnode->flags));
176
177 if (status->type != vnode->status.type) {
178 pr_warning("Vnode %llx:%llx:%x changed type %u to %u\n",
179 vnode->fid.vid,
180 vnode->fid.vnode,
181 vnode->fid.unique,
182 status->type, vnode->status.type);
183 afs_protocol_error(NULL, -EBADMSG, afs_eproto_bad_status);
184 return;
185 }
186
187 if (status->nlink != vnode->status.nlink)
188 set_nlink(&vnode->vfs_inode, status->nlink);
189
190 if (status->owner != vnode->status.owner)
191 vnode->vfs_inode.i_uid = make_kuid(&init_user_ns, status->owner);
192
193 if (status->group != vnode->status.group)
194 vnode->vfs_inode.i_gid = make_kgid(&init_user_ns, status->group);
195
196 if (status->mode != vnode->status.mode) {
197 mode = vnode->vfs_inode.i_mode;
198 mode &= ~S_IALLUGO;
199 mode |= status->mode;
200 WRITE_ONCE(vnode->vfs_inode.i_mode, mode);
201 }
202
203 t = status->mtime_client;
204 vnode->vfs_inode.i_ctime = t;
205 vnode->vfs_inode.i_mtime = t;
206 vnode->vfs_inode.i_atime = t;
207
208 if (vnode->status.data_version != status->data_version)
209 data_changed = true;
210
211 vnode->status = *status;
212
213 if (expected_version &&
214 *expected_version != status->data_version) {
215 if (test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags))
216 pr_warn("kAFS: vnode modified {%llx:%llu} %llx->%llx %s\n",
217 vnode->fid.vid, vnode->fid.vnode,
218 (unsigned long long)*expected_version,
219 (unsigned long long)status->data_version,
220 fc->type ? fc->type->name : "???");
221
222 vnode->invalid_before = status->data_version;
223 if (vnode->status.type == AFS_FTYPE_DIR) {
224 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags))
225 afs_stat_v(vnode, n_inval);
226 } else {
227 set_bit(AFS_VNODE_ZAP_DATA, &vnode->flags);
228 }
229 } else if (vnode->status.type == AFS_FTYPE_DIR) {
230
231
232
233
234 if (test_bit(AFS_VNODE_DIR_VALID, &vnode->flags))
235 data_changed = false;
236 }
237
238 if (data_changed) {
239 inode_set_iversion_raw(&vnode->vfs_inode, status->data_version);
240 afs_set_i_size(vnode, status->size);
241 }
242}
243
244
245
246
247static void afs_apply_callback(struct afs_fs_cursor *fc,
248 struct afs_vnode *vnode,
249 struct afs_status_cb *scb,
250 unsigned int cb_break)
251{
252 struct afs_cb_interest *old;
253 struct afs_callback *cb = &scb->callback;
254
255 if (!afs_cb_is_broken(cb_break, vnode, fc->cbi)) {
256 vnode->cb_expires_at = cb->expires_at;
257 old = rcu_dereference_protected(vnode->cb_interest,
258 lockdep_is_held(&vnode->cb_lock.lock));
259 if (old != fc->cbi) {
260 rcu_assign_pointer(vnode->cb_interest, afs_get_cb_interest(fc->cbi));
261 afs_put_cb_interest(afs_v2net(vnode), old);
262 }
263 set_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
264 }
265}
266
267
268
269
270
271void afs_vnode_commit_status(struct afs_fs_cursor *fc,
272 struct afs_vnode *vnode,
273 unsigned int cb_break,
274 const afs_dataversion_t *expected_version,
275 struct afs_status_cb *scb)
276{
277 if (fc->ac.error != 0)
278 return;
279
280 write_seqlock(&vnode->cb_lock);
281
282 if (scb->have_error) {
283 if (scb->status.abort_code == VNOVNODE) {
284 set_bit(AFS_VNODE_DELETED, &vnode->flags);
285 clear_nlink(&vnode->vfs_inode);
286 __afs_break_callback(vnode, afs_cb_break_for_deleted);
287 }
288 } else {
289 if (scb->have_status)
290 afs_apply_status(fc, vnode, scb, expected_version);
291 if (scb->have_cb)
292 afs_apply_callback(fc, vnode, scb, cb_break);
293 }
294
295 write_sequnlock(&vnode->cb_lock);
296
297 if (fc->ac.error == 0 && scb->have_status)
298 afs_cache_permit(vnode, fc->key, cb_break, scb);
299}
300
301
302
303
304int afs_fetch_status(struct afs_vnode *vnode, struct key *key, bool is_new,
305 afs_access_t *_caller_access)
306{
307 struct afs_status_cb *scb;
308 struct afs_fs_cursor fc;
309 int ret;
310
311 _enter("%s,{%llx:%llu.%u,S=%lx}",
312 vnode->volume->name,
313 vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique,
314 vnode->flags);
315
316 scb = kzalloc(sizeof(struct afs_status_cb), GFP_KERNEL);
317 if (!scb)
318 return -ENOMEM;
319
320 ret = -ERESTARTSYS;
321 if (afs_begin_vnode_operation(&fc, vnode, key, true)) {
322 afs_dataversion_t data_version = vnode->status.data_version;
323
324 while (afs_select_fileserver(&fc)) {
325 fc.cb_break = afs_calc_vnode_cb_break(vnode);
326 afs_fs_fetch_file_status(&fc, scb, NULL);
327 }
328
329 if (fc.error) {
330
331 } else if (is_new) {
332 ret = afs_inode_init_from_status(vnode, key, fc.cbi,
333 NULL, scb);
334 fc.error = ret;
335 if (ret == 0)
336 afs_cache_permit(vnode, key, fc.cb_break, scb);
337 } else {
338 afs_vnode_commit_status(&fc, vnode, fc.cb_break,
339 &data_version, scb);
340 }
341 afs_check_for_remote_deletion(&fc, vnode);
342 ret = afs_end_vnode_operation(&fc);
343 }
344
345 if (ret == 0 && _caller_access)
346 *_caller_access = scb->status.caller_access;
347 kfree(scb);
348 _leave(" = %d", ret);
349 return ret;
350}
351
352
353
354
355int afs_iget5_test(struct inode *inode, void *opaque)
356{
357 struct afs_iget_data *iget_data = opaque;
358 struct afs_vnode *vnode = AFS_FS_I(inode);
359
360 return memcmp(&vnode->fid, &iget_data->fid, sizeof(iget_data->fid)) == 0;
361}
362
363
364
365
366
367
368static int afs_iget5_pseudo_dir_test(struct inode *inode, void *opaque)
369{
370 return 0;
371}
372
373
374
375
376static int afs_iget5_set(struct inode *inode, void *opaque)
377{
378 struct afs_iget_data *iget_data = opaque;
379 struct afs_vnode *vnode = AFS_FS_I(inode);
380
381 vnode->fid = iget_data->fid;
382 vnode->volume = iget_data->volume;
383 vnode->cb_v_break = iget_data->cb_v_break;
384 vnode->cb_s_break = iget_data->cb_s_break;
385
386
387
388
389 inode->i_ino = iget_data->fid.vnode;
390 inode->i_generation = iget_data->fid.unique;
391 return 0;
392}
393
394
395
396
397
398struct inode *afs_iget_pseudo_dir(struct super_block *sb, bool root)
399{
400 struct afs_super_info *as;
401 struct afs_vnode *vnode;
402 struct inode *inode;
403 static atomic_t afs_autocell_ino;
404
405 struct afs_iget_data iget_data = {
406 .cb_v_break = 0,
407 .cb_s_break = 0,
408 };
409
410 _enter("");
411
412 as = sb->s_fs_info;
413 if (as->volume) {
414 iget_data.volume = as->volume;
415 iget_data.fid.vid = as->volume->vid;
416 }
417 if (root) {
418 iget_data.fid.vnode = 1;
419 iget_data.fid.unique = 1;
420 } else {
421 iget_data.fid.vnode = atomic_inc_return(&afs_autocell_ino);
422 iget_data.fid.unique = 0;
423 }
424
425 inode = iget5_locked(sb, iget_data.fid.vnode,
426 afs_iget5_pseudo_dir_test, afs_iget5_set,
427 &iget_data);
428 if (!inode) {
429 _leave(" = -ENOMEM");
430 return ERR_PTR(-ENOMEM);
431 }
432
433 _debug("GOT INODE %p { ino=%lu, vl=%llx, vn=%llx, u=%x }",
434 inode, inode->i_ino, iget_data.fid.vid, iget_data.fid.vnode,
435 iget_data.fid.unique);
436
437 vnode = AFS_FS_I(inode);
438
439
440 BUG_ON(!(inode->i_state & I_NEW));
441
442 inode->i_size = 0;
443 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
444 if (root) {
445 inode->i_op = &afs_dynroot_inode_operations;
446 inode->i_fop = &afs_dynroot_file_operations;
447 } else {
448 inode->i_op = &afs_autocell_inode_operations;
449 }
450 set_nlink(inode, 2);
451 inode->i_uid = GLOBAL_ROOT_UID;
452 inode->i_gid = GLOBAL_ROOT_GID;
453 inode->i_ctime = inode->i_atime = inode->i_mtime = current_time(inode);
454 inode->i_blocks = 0;
455 inode_set_iversion_raw(inode, 0);
456 inode->i_generation = 0;
457
458 set_bit(AFS_VNODE_PSEUDODIR, &vnode->flags);
459 if (!root) {
460 set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags);
461 inode->i_flags |= S_AUTOMOUNT;
462 }
463
464 inode->i_flags |= S_NOATIME;
465 unlock_new_inode(inode);
466 _leave(" = %p", inode);
467 return inode;
468}
469
470
471
472
473static void afs_get_inode_cache(struct afs_vnode *vnode)
474{
475#ifdef CONFIG_AFS_FSCACHE
476 struct {
477 u32 vnode_id;
478 u32 unique;
479 u32 vnode_id_ext[2];
480 } __packed key;
481 struct afs_vnode_cache_aux aux;
482
483 if (vnode->status.type == AFS_FTYPE_DIR) {
484 vnode->cache = NULL;
485 return;
486 }
487
488 key.vnode_id = vnode->fid.vnode;
489 key.unique = vnode->fid.unique;
490 key.vnode_id_ext[0] = vnode->fid.vnode >> 32;
491 key.vnode_id_ext[1] = vnode->fid.vnode_hi;
492 aux.data_version = vnode->status.data_version;
493
494 vnode->cache = fscache_acquire_cookie(vnode->volume->cache,
495 &afs_vnode_cache_index_def,
496 &key, sizeof(key),
497 &aux, sizeof(aux),
498 vnode, vnode->status.size, true);
499#endif
500}
501
502
503
504
505struct inode *afs_iget(struct super_block *sb, struct key *key,
506 struct afs_iget_data *iget_data,
507 struct afs_status_cb *scb,
508 struct afs_cb_interest *cbi,
509 struct afs_vnode *parent_vnode)
510{
511 struct afs_super_info *as;
512 struct afs_vnode *vnode;
513 struct afs_fid *fid = &iget_data->fid;
514 struct inode *inode;
515 int ret;
516
517 _enter(",{%llx:%llu.%u},,", fid->vid, fid->vnode, fid->unique);
518
519 as = sb->s_fs_info;
520 iget_data->volume = as->volume;
521
522 inode = iget5_locked(sb, fid->vnode, afs_iget5_test, afs_iget5_set,
523 iget_data);
524 if (!inode) {
525 _leave(" = -ENOMEM");
526 return ERR_PTR(-ENOMEM);
527 }
528
529 _debug("GOT INODE %p { vl=%llx vn=%llx, u=%x }",
530 inode, fid->vid, fid->vnode, fid->unique);
531
532 vnode = AFS_FS_I(inode);
533
534
535 if (!(inode->i_state & I_NEW)) {
536 _leave(" = %p", inode);
537 return inode;
538 }
539
540 if (!scb) {
541
542 ret = afs_fetch_status(vnode, key, true, NULL);
543 if (ret < 0)
544 goto bad_inode;
545 } else {
546 ret = afs_inode_init_from_status(vnode, key, cbi, parent_vnode,
547 scb);
548 if (ret < 0)
549 goto bad_inode;
550 }
551
552 afs_get_inode_cache(vnode);
553
554
555 clear_bit(AFS_VNODE_UNSET, &vnode->flags);
556 inode->i_flags |= S_NOATIME;
557 unlock_new_inode(inode);
558 _leave(" = %p", inode);
559 return inode;
560
561
562bad_inode:
563 iget_failed(inode);
564 _leave(" = %d [bad]", ret);
565 return ERR_PTR(ret);
566}
567
568
569
570
571
572void afs_zap_data(struct afs_vnode *vnode)
573{
574 _enter("{%llx:%llu}", vnode->fid.vid, vnode->fid.vnode);
575
576#ifdef CONFIG_AFS_FSCACHE
577 fscache_invalidate(vnode->cache);
578#endif
579
580
581
582
583 if (S_ISREG(vnode->vfs_inode.i_mode))
584 invalidate_remote_inode(&vnode->vfs_inode);
585 else
586 invalidate_inode_pages2(vnode->vfs_inode.i_mapping);
587}
588
589
590
591
592bool afs_check_validity(struct afs_vnode *vnode)
593{
594 struct afs_cb_interest *cbi;
595 struct afs_server *server;
596 struct afs_volume *volume = vnode->volume;
597 enum afs_cb_break_reason need_clear = afs_cb_break_no_break;
598 time64_t now = ktime_get_real_seconds();
599 bool valid;
600 unsigned int cb_break, cb_s_break, cb_v_break;
601 int seq = 0;
602
603 do {
604 read_seqbegin_or_lock(&vnode->cb_lock, &seq);
605 cb_v_break = READ_ONCE(volume->cb_v_break);
606 cb_break = vnode->cb_break;
607
608 if (test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) {
609 cbi = rcu_dereference(vnode->cb_interest);
610 server = rcu_dereference(cbi->server);
611 cb_s_break = READ_ONCE(server->cb_s_break);
612
613 if (vnode->cb_s_break != cb_s_break ||
614 vnode->cb_v_break != cb_v_break) {
615 vnode->cb_s_break = cb_s_break;
616 vnode->cb_v_break = cb_v_break;
617 need_clear = afs_cb_break_for_vsbreak;
618 valid = false;
619 } else if (test_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) {
620 need_clear = afs_cb_break_for_zap;
621 valid = false;
622 } else if (vnode->cb_expires_at - 10 <= now) {
623 need_clear = afs_cb_break_for_lapsed;
624 valid = false;
625 } else {
626 valid = true;
627 }
628 } else if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
629 valid = true;
630 } else {
631 vnode->cb_v_break = cb_v_break;
632 valid = false;
633 }
634
635 } while (need_seqretry(&vnode->cb_lock, seq));
636
637 done_seqretry(&vnode->cb_lock, seq);
638
639 if (need_clear != afs_cb_break_no_break) {
640 write_seqlock(&vnode->cb_lock);
641 if (cb_break == vnode->cb_break)
642 __afs_break_callback(vnode, need_clear);
643 else
644 trace_afs_cb_miss(&vnode->fid, need_clear);
645 write_sequnlock(&vnode->cb_lock);
646 valid = false;
647 }
648
649 return valid;
650}
651
652
653
654
655
656
657
658
659
660
661int afs_validate(struct afs_vnode *vnode, struct key *key)
662{
663 bool valid;
664 int ret;
665
666 _enter("{v={%llx:%llu} fl=%lx},%x",
667 vnode->fid.vid, vnode->fid.vnode, vnode->flags,
668 key_serial(key));
669
670 rcu_read_lock();
671 valid = afs_check_validity(vnode);
672 rcu_read_unlock();
673
674 if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
675 clear_nlink(&vnode->vfs_inode);
676
677 if (valid)
678 goto valid;
679
680 down_write(&vnode->validate_lock);
681
682
683
684
685
686 if (!test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) {
687 _debug("not promised");
688 ret = afs_fetch_status(vnode, key, false, NULL);
689 if (ret < 0) {
690 if (ret == -ENOENT) {
691 set_bit(AFS_VNODE_DELETED, &vnode->flags);
692 ret = -ESTALE;
693 }
694 goto error_unlock;
695 }
696 _debug("new promise [fl=%lx]", vnode->flags);
697 }
698
699 if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
700 _debug("file already deleted");
701 ret = -ESTALE;
702 goto error_unlock;
703 }
704
705
706
707 if (test_and_clear_bit(AFS_VNODE_ZAP_DATA, &vnode->flags))
708 afs_zap_data(vnode);
709 up_write(&vnode->validate_lock);
710valid:
711 _leave(" = 0");
712 return 0;
713
714error_unlock:
715 up_write(&vnode->validate_lock);
716 _leave(" = %d", ret);
717 return ret;
718}
719
720
721
722
723int afs_getattr(const struct path *path, struct kstat *stat,
724 u32 request_mask, unsigned int query_flags)
725{
726 struct inode *inode = d_inode(path->dentry);
727 struct afs_vnode *vnode = AFS_FS_I(inode);
728 int seq = 0;
729
730 _enter("{ ino=%lu v=%u }", inode->i_ino, inode->i_generation);
731
732 do {
733 read_seqbegin_or_lock(&vnode->cb_lock, &seq);
734 generic_fillattr(inode, stat);
735 } while (need_seqretry(&vnode->cb_lock, seq));
736
737 done_seqretry(&vnode->cb_lock, seq);
738 return 0;
739}
740
741
742
743
744int afs_drop_inode(struct inode *inode)
745{
746 _enter("");
747
748 if (test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(inode)->flags))
749 return generic_delete_inode(inode);
750 else
751 return generic_drop_inode(inode);
752}
753
754
755
756
757void afs_evict_inode(struct inode *inode)
758{
759 struct afs_cb_interest *cbi;
760 struct afs_vnode *vnode;
761
762 vnode = AFS_FS_I(inode);
763
764 _enter("{%llx:%llu.%d}",
765 vnode->fid.vid,
766 vnode->fid.vnode,
767 vnode->fid.unique);
768
769 _debug("CLEAR INODE %p", inode);
770
771 ASSERTCMP(inode->i_ino, ==, vnode->fid.vnode);
772
773 truncate_inode_pages_final(&inode->i_data);
774 clear_inode(inode);
775
776 write_seqlock(&vnode->cb_lock);
777 cbi = rcu_dereference_protected(vnode->cb_interest,
778 lockdep_is_held(&vnode->cb_lock.lock));
779 if (cbi) {
780 afs_put_cb_interest(afs_i2net(inode), cbi);
781 rcu_assign_pointer(vnode->cb_interest, NULL);
782 }
783 write_sequnlock(&vnode->cb_lock);
784
785 while (!list_empty(&vnode->wb_keys)) {
786 struct afs_wb_key *wbk = list_entry(vnode->wb_keys.next,
787 struct afs_wb_key, vnode_link);
788 list_del(&wbk->vnode_link);
789 afs_put_wb_key(wbk);
790 }
791
792#ifdef CONFIG_AFS_FSCACHE
793 {
794 struct afs_vnode_cache_aux aux;
795
796 aux.data_version = vnode->status.data_version;
797 fscache_relinquish_cookie(vnode->cache, &aux,
798 test_bit(AFS_VNODE_DELETED, &vnode->flags));
799 vnode->cache = NULL;
800 }
801#endif
802
803 afs_prune_wb_keys(vnode);
804 afs_put_permits(rcu_access_pointer(vnode->permit_cache));
805 key_put(vnode->silly_key);
806 vnode->silly_key = NULL;
807 key_put(vnode->lock_key);
808 vnode->lock_key = NULL;
809 _leave("");
810}
811
812
813
814
815int afs_setattr(struct dentry *dentry, struct iattr *attr)
816{
817 struct afs_fs_cursor fc;
818 struct afs_status_cb *scb;
819 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
820 struct key *key;
821 int ret = -ENOMEM;
822
823 _enter("{%llx:%llu},{n=%pd},%x",
824 vnode->fid.vid, vnode->fid.vnode, dentry,
825 attr->ia_valid);
826
827 if (!(attr->ia_valid & (ATTR_SIZE | ATTR_MODE | ATTR_UID | ATTR_GID |
828 ATTR_MTIME))) {
829 _leave(" = 0 [unsupported]");
830 return 0;
831 }
832
833 scb = kzalloc(sizeof(struct afs_status_cb), GFP_KERNEL);
834 if (!scb)
835 goto error;
836
837
838 if (S_ISREG(vnode->vfs_inode.i_mode))
839 filemap_write_and_wait(vnode->vfs_inode.i_mapping);
840
841 if (attr->ia_valid & ATTR_FILE) {
842 key = afs_file_key(attr->ia_file);
843 } else {
844 key = afs_request_key(vnode->volume->cell);
845 if (IS_ERR(key)) {
846 ret = PTR_ERR(key);
847 goto error_scb;
848 }
849 }
850
851 ret = -ERESTARTSYS;
852 if (afs_begin_vnode_operation(&fc, vnode, key, false)) {
853 afs_dataversion_t data_version = vnode->status.data_version;
854
855 if (attr->ia_valid & ATTR_SIZE)
856 data_version++;
857
858 while (afs_select_fileserver(&fc)) {
859 fc.cb_break = afs_calc_vnode_cb_break(vnode);
860 afs_fs_setattr(&fc, attr, scb);
861 }
862
863 afs_check_for_remote_deletion(&fc, vnode);
864 afs_vnode_commit_status(&fc, vnode, fc.cb_break,
865 &data_version, scb);
866 ret = afs_end_vnode_operation(&fc);
867 }
868
869 if (!(attr->ia_valid & ATTR_FILE))
870 key_put(key);
871
872error_scb:
873 kfree(scb);
874error:
875 _leave(" = %d", ret);
876 return ret;
877}
878
