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42
43#include "ubifs.h"
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59static int inherit_flags(const struct inode *dir, int mode)
60{
61 int flags;
62 const struct ubifs_inode *ui = ubifs_inode(dir);
63
64 if (!S_ISDIR(dir->i_mode))
65
66
67
68
69 return 0;
70
71 flags = ui->flags & (UBIFS_COMPR_FL | UBIFS_SYNC_FL | UBIFS_DIRSYNC_FL);
72 if (!S_ISDIR(mode))
73
74 flags &= ~UBIFS_DIRSYNC_FL;
75 return flags;
76}
77
78
79
80
81
82
83
84
85
86
87
88struct inode *ubifs_new_inode(struct ubifs_info *c, const struct inode *dir,
89 int mode)
90{
91 struct inode *inode;
92 struct ubifs_inode *ui;
93
94 inode = new_inode(c->vfs_sb);
95 ui = ubifs_inode(inode);
96 if (!inode)
97 return ERR_PTR(-ENOMEM);
98
99
100
101
102
103
104
105 inode->i_flags |= (S_NOCMTIME);
106
107 inode_init_owner(inode, dir, mode);
108 inode->i_mtime = inode->i_atime = inode->i_ctime =
109 ubifs_current_time(inode);
110 inode->i_mapping->nrpages = 0;
111
112 inode->i_mapping->backing_dev_info = &c->bdi;
113
114 switch (mode & S_IFMT) {
115 case S_IFREG:
116 inode->i_mapping->a_ops = &ubifs_file_address_operations;
117 inode->i_op = &ubifs_file_inode_operations;
118 inode->i_fop = &ubifs_file_operations;
119 break;
120 case S_IFDIR:
121 inode->i_op = &ubifs_dir_inode_operations;
122 inode->i_fop = &ubifs_dir_operations;
123 inode->i_size = ui->ui_size = UBIFS_INO_NODE_SZ;
124 break;
125 case S_IFLNK:
126 inode->i_op = &ubifs_symlink_inode_operations;
127 break;
128 case S_IFSOCK:
129 case S_IFIFO:
130 case S_IFBLK:
131 case S_IFCHR:
132 inode->i_op = &ubifs_file_inode_operations;
133 break;
134 default:
135 BUG();
136 }
137
138 ui->flags = inherit_flags(dir, mode);
139 ubifs_set_inode_flags(inode);
140 if (S_ISREG(mode))
141 ui->compr_type = c->default_compr;
142 else
143 ui->compr_type = UBIFS_COMPR_NONE;
144 ui->synced_i_size = 0;
145
146 spin_lock(&c->cnt_lock);
147
148 if (c->highest_inum >= INUM_WARN_WATERMARK) {
149 if (c->highest_inum >= INUM_WATERMARK) {
150 spin_unlock(&c->cnt_lock);
151 ubifs_err("out of inode numbers");
152 make_bad_inode(inode);
153 iput(inode);
154 return ERR_PTR(-EINVAL);
155 }
156 ubifs_warn("running out of inode numbers (current %lu, max %d)",
157 (unsigned long)c->highest_inum, INUM_WATERMARK);
158 }
159
160 inode->i_ino = ++c->highest_inum;
161
162
163
164
165
166
167
168 ui->creat_sqnum = ++c->max_sqnum;
169 spin_unlock(&c->cnt_lock);
170 return inode;
171}
172
173#ifdef CONFIG_UBIFS_FS_DEBUG
174
175static int dbg_check_name(struct ubifs_dent_node *dent, struct qstr *nm)
176{
177 if (!(ubifs_chk_flags & UBIFS_CHK_GEN))
178 return 0;
179 if (le16_to_cpu(dent->nlen) != nm->len)
180 return -EINVAL;
181 if (memcmp(dent->name, nm->name, nm->len))
182 return -EINVAL;
183 return 0;
184}
185
186#else
187
188#define dbg_check_name(dent, nm) 0
189
190#endif
191
192static struct dentry *ubifs_lookup(struct inode *dir, struct dentry *dentry,
193 struct nameidata *nd)
194{
195 int err;
196 union ubifs_key key;
197 struct inode *inode = NULL;
198 struct ubifs_dent_node *dent;
199 struct ubifs_info *c = dir->i_sb->s_fs_info;
200
201 dbg_gen("'%.*s' in dir ino %lu",
202 dentry->d_name.len, dentry->d_name.name, dir->i_ino);
203
204 if (dentry->d_name.len > UBIFS_MAX_NLEN)
205 return ERR_PTR(-ENAMETOOLONG);
206
207 dent = kmalloc(UBIFS_MAX_DENT_NODE_SZ, GFP_NOFS);
208 if (!dent)
209 return ERR_PTR(-ENOMEM);
210
211 dent_key_init(c, &key, dir->i_ino, &dentry->d_name);
212
213 err = ubifs_tnc_lookup_nm(c, &key, dent, &dentry->d_name);
214 if (err) {
215 if (err == -ENOENT) {
216 dbg_gen("not found");
217 goto done;
218 }
219 goto out;
220 }
221
222 if (dbg_check_name(dent, &dentry->d_name)) {
223 err = -EINVAL;
224 goto out;
225 }
226
227 inode = ubifs_iget(dir->i_sb, le64_to_cpu(dent->inum));
228 if (IS_ERR(inode)) {
229
230
231
232
233 err = PTR_ERR(inode);
234 ubifs_err("dead directory entry '%.*s', error %d",
235 dentry->d_name.len, dentry->d_name.name, err);
236 ubifs_ro_mode(c, err);
237 goto out;
238 }
239
240done:
241 kfree(dent);
242
243
244
245
246 d_add(dentry, inode);
247 return NULL;
248
249out:
250 kfree(dent);
251 return ERR_PTR(err);
252}
253
254static int ubifs_create(struct inode *dir, struct dentry *dentry, int mode,
255 struct nameidata *nd)
256{
257 struct inode *inode;
258 struct ubifs_info *c = dir->i_sb->s_fs_info;
259 int err, sz_change = CALC_DENT_SIZE(dentry->d_name.len);
260 struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1,
261 .dirtied_ino = 1 };
262 struct ubifs_inode *dir_ui = ubifs_inode(dir);
263
264
265
266
267
268
269 dbg_gen("dent '%.*s', mode %#x in dir ino %lu",
270 dentry->d_name.len, dentry->d_name.name, mode, dir->i_ino);
271
272 err = ubifs_budget_space(c, &req);
273 if (err)
274 return err;
275
276 inode = ubifs_new_inode(c, dir, mode);
277 if (IS_ERR(inode)) {
278 err = PTR_ERR(inode);
279 goto out_budg;
280 }
281
282 mutex_lock(&dir_ui->ui_mutex);
283 dir->i_size += sz_change;
284 dir_ui->ui_size = dir->i_size;
285 dir->i_mtime = dir->i_ctime = inode->i_ctime;
286 err = ubifs_jnl_update(c, dir, &dentry->d_name, inode, 0, 0);
287 if (err)
288 goto out_cancel;
289 mutex_unlock(&dir_ui->ui_mutex);
290
291 ubifs_release_budget(c, &req);
292 insert_inode_hash(inode);
293 d_instantiate(dentry, inode);
294 return 0;
295
296out_cancel:
297 dir->i_size -= sz_change;
298 dir_ui->ui_size = dir->i_size;
299 mutex_unlock(&dir_ui->ui_mutex);
300 make_bad_inode(inode);
301 iput(inode);
302out_budg:
303 ubifs_release_budget(c, &req);
304 ubifs_err("cannot create regular file, error %d", err);
305 return err;
306}
307
308
309
310
311
312
313
314
315static unsigned int vfs_dent_type(uint8_t type)
316{
317 switch (type) {
318 case UBIFS_ITYPE_REG:
319 return DT_REG;
320 case UBIFS_ITYPE_DIR:
321 return DT_DIR;
322 case UBIFS_ITYPE_LNK:
323 return DT_LNK;
324 case UBIFS_ITYPE_BLK:
325 return DT_BLK;
326 case UBIFS_ITYPE_CHR:
327 return DT_CHR;
328 case UBIFS_ITYPE_FIFO:
329 return DT_FIFO;
330 case UBIFS_ITYPE_SOCK:
331 return DT_SOCK;
332 default:
333 BUG();
334 }
335 return 0;
336}
337
338
339
340
341
342
343
344
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346
347
348
349
350
351
352
353
354
355static int ubifs_readdir(struct file *file, void *dirent, filldir_t filldir)
356{
357 int err, over = 0;
358 struct qstr nm;
359 union ubifs_key key;
360 struct ubifs_dent_node *dent;
361 struct inode *dir = file->f_path.dentry->d_inode;
362 struct ubifs_info *c = dir->i_sb->s_fs_info;
363
364 dbg_gen("dir ino %lu, f_pos %#llx", dir->i_ino, file->f_pos);
365
366 if (file->f_pos > UBIFS_S_KEY_HASH_MASK || file->f_pos == 2)
367
368
369
370
371 return 0;
372
373
374 if (file->f_pos == 0) {
375 ubifs_assert(!file->private_data);
376 over = filldir(dirent, ".", 1, 0, dir->i_ino, DT_DIR);
377 if (over)
378 return 0;
379 file->f_pos = 1;
380 }
381
382 if (file->f_pos == 1) {
383 ubifs_assert(!file->private_data);
384 over = filldir(dirent, "..", 2, 1,
385 parent_ino(file->f_path.dentry), DT_DIR);
386 if (over)
387 return 0;
388
389
390 lowest_dent_key(c, &key, dir->i_ino);
391 nm.name = NULL;
392 dent = ubifs_tnc_next_ent(c, &key, &nm);
393 if (IS_ERR(dent)) {
394 err = PTR_ERR(dent);
395 goto out;
396 }
397
398 file->f_pos = key_hash_flash(c, &dent->key);
399 file->private_data = dent;
400 }
401
402 dent = file->private_data;
403 if (!dent) {
404
405
406
407
408
409 dent_key_init_hash(c, &key, dir->i_ino, file->f_pos);
410 nm.name = NULL;
411 dent = ubifs_tnc_next_ent(c, &key, &nm);
412 if (IS_ERR(dent)) {
413 err = PTR_ERR(dent);
414 goto out;
415 }
416 file->f_pos = key_hash_flash(c, &dent->key);
417 file->private_data = dent;
418 }
419
420 while (1) {
421 dbg_gen("feed '%s', ino %llu, new f_pos %#x",
422 dent->name, (unsigned long long)le64_to_cpu(dent->inum),
423 key_hash_flash(c, &dent->key));
424 ubifs_assert(le64_to_cpu(dent->ch.sqnum) >
425 ubifs_inode(dir)->creat_sqnum);
426
427 nm.len = le16_to_cpu(dent->nlen);
428 over = filldir(dirent, dent->name, nm.len, file->f_pos,
429 le64_to_cpu(dent->inum),
430 vfs_dent_type(dent->type));
431 if (over)
432 return 0;
433
434
435 key_read(c, &dent->key, &key);
436 nm.name = dent->name;
437 dent = ubifs_tnc_next_ent(c, &key, &nm);
438 if (IS_ERR(dent)) {
439 err = PTR_ERR(dent);
440 goto out;
441 }
442
443 kfree(file->private_data);
444 file->f_pos = key_hash_flash(c, &dent->key);
445 file->private_data = dent;
446 cond_resched();
447 }
448
449out:
450 if (err != -ENOENT) {
451 ubifs_err("cannot find next direntry, error %d", err);
452 return err;
453 }
454
455 kfree(file->private_data);
456 file->private_data = NULL;
457 file->f_pos = 2;
458 return 0;
459}
460
461
462static loff_t ubifs_dir_llseek(struct file *file, loff_t offset, int origin)
463{
464 kfree(file->private_data);
465 file->private_data = NULL;
466 return generic_file_llseek(file, offset, origin);
467}
468
469
470static int ubifs_dir_release(struct inode *dir, struct file *file)
471{
472 kfree(file->private_data);
473 file->private_data = NULL;
474 return 0;
475}
476
477
478
479
480
481
482
483
484
485
486static void lock_2_inodes(struct inode *inode1, struct inode *inode2)
487{
488 mutex_lock_nested(&ubifs_inode(inode1)->ui_mutex, WB_MUTEX_1);
489 mutex_lock_nested(&ubifs_inode(inode2)->ui_mutex, WB_MUTEX_2);
490}
491
492
493
494
495
496
497static void unlock_2_inodes(struct inode *inode1, struct inode *inode2)
498{
499 mutex_unlock(&ubifs_inode(inode2)->ui_mutex);
500 mutex_unlock(&ubifs_inode(inode1)->ui_mutex);
501}
502
503static int ubifs_link(struct dentry *old_dentry, struct inode *dir,
504 struct dentry *dentry)
505{
506 struct ubifs_info *c = dir->i_sb->s_fs_info;
507 struct inode *inode = old_dentry->d_inode;
508 struct ubifs_inode *ui = ubifs_inode(inode);
509 struct ubifs_inode *dir_ui = ubifs_inode(dir);
510 int err, sz_change = CALC_DENT_SIZE(dentry->d_name.len);
511 struct ubifs_budget_req req = { .new_dent = 1, .dirtied_ino = 2,
512 .dirtied_ino_d = ALIGN(ui->data_len, 8) };
513
514
515
516
517
518
519 dbg_gen("dent '%.*s' to ino %lu (nlink %d) in dir ino %lu",
520 dentry->d_name.len, dentry->d_name.name, inode->i_ino,
521 inode->i_nlink, dir->i_ino);
522 ubifs_assert(mutex_is_locked(&dir->i_mutex));
523 ubifs_assert(mutex_is_locked(&inode->i_mutex));
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540 if (inode->i_nlink == 0)
541 return -ENOENT;
542
543 err = dbg_check_synced_i_size(inode);
544 if (err)
545 return err;
546
547 err = ubifs_budget_space(c, &req);
548 if (err)
549 return err;
550
551 lock_2_inodes(dir, inode);
552 inc_nlink(inode);
553 ihold(inode);
554 inode->i_ctime = ubifs_current_time(inode);
555 dir->i_size += sz_change;
556 dir_ui->ui_size = dir->i_size;
557 dir->i_mtime = dir->i_ctime = inode->i_ctime;
558 err = ubifs_jnl_update(c, dir, &dentry->d_name, inode, 0, 0);
559 if (err)
560 goto out_cancel;
561 unlock_2_inodes(dir, inode);
562
563 ubifs_release_budget(c, &req);
564 d_instantiate(dentry, inode);
565 return 0;
566
567out_cancel:
568 dir->i_size -= sz_change;
569 dir_ui->ui_size = dir->i_size;
570 drop_nlink(inode);
571 unlock_2_inodes(dir, inode);
572 ubifs_release_budget(c, &req);
573 iput(inode);
574 return err;
575}
576
577static int ubifs_unlink(struct inode *dir, struct dentry *dentry)
578{
579 struct ubifs_info *c = dir->i_sb->s_fs_info;
580 struct inode *inode = dentry->d_inode;
581 struct ubifs_inode *dir_ui = ubifs_inode(dir);
582 int sz_change = CALC_DENT_SIZE(dentry->d_name.len);
583 int err, budgeted = 1;
584 struct ubifs_budget_req req = { .mod_dent = 1, .dirtied_ino = 2 };
585
586
587
588
589
590
591
592
593 dbg_gen("dent '%.*s' from ino %lu (nlink %d) in dir ino %lu",
594 dentry->d_name.len, dentry->d_name.name, inode->i_ino,
595 inode->i_nlink, dir->i_ino);
596 ubifs_assert(mutex_is_locked(&dir->i_mutex));
597 ubifs_assert(mutex_is_locked(&inode->i_mutex));
598 err = dbg_check_synced_i_size(inode);
599 if (err)
600 return err;
601
602 err = ubifs_budget_space(c, &req);
603 if (err) {
604 if (err != -ENOSPC)
605 return err;
606 budgeted = 0;
607 }
608
609 lock_2_inodes(dir, inode);
610 inode->i_ctime = ubifs_current_time(dir);
611 drop_nlink(inode);
612 dir->i_size -= sz_change;
613 dir_ui->ui_size = dir->i_size;
614 dir->i_mtime = dir->i_ctime = inode->i_ctime;
615 err = ubifs_jnl_update(c, dir, &dentry->d_name, inode, 1, 0);
616 if (err)
617 goto out_cancel;
618 unlock_2_inodes(dir, inode);
619
620 if (budgeted)
621 ubifs_release_budget(c, &req);
622 else {
623
624 c->nospace = c->nospace_rp = 0;
625 smp_wmb();
626 }
627 return 0;
628
629out_cancel:
630 dir->i_size += sz_change;
631 dir_ui->ui_size = dir->i_size;
632 inc_nlink(inode);
633 unlock_2_inodes(dir, inode);
634 if (budgeted)
635 ubifs_release_budget(c, &req);
636 return err;
637}
638
639
640
641
642
643
644
645
646
647
648static int check_dir_empty(struct ubifs_info *c, struct inode *dir)
649{
650 struct qstr nm = { .name = NULL };
651 struct ubifs_dent_node *dent;
652 union ubifs_key key;
653 int err;
654
655 lowest_dent_key(c, &key, dir->i_ino);
656 dent = ubifs_tnc_next_ent(c, &key, &nm);
657 if (IS_ERR(dent)) {
658 err = PTR_ERR(dent);
659 if (err == -ENOENT)
660 err = 0;
661 } else {
662 kfree(dent);
663 err = -ENOTEMPTY;
664 }
665 return err;
666}
667
668static int ubifs_rmdir(struct inode *dir, struct dentry *dentry)
669{
670 struct ubifs_info *c = dir->i_sb->s_fs_info;
671 struct inode *inode = dentry->d_inode;
672 int sz_change = CALC_DENT_SIZE(dentry->d_name.len);
673 int err, budgeted = 1;
674 struct ubifs_inode *dir_ui = ubifs_inode(dir);
675 struct ubifs_budget_req req = { .mod_dent = 1, .dirtied_ino = 2 };
676
677
678
679
680
681
682
683 dbg_gen("directory '%.*s', ino %lu in dir ino %lu", dentry->d_name.len,
684 dentry->d_name.name, inode->i_ino, dir->i_ino);
685 ubifs_assert(mutex_is_locked(&dir->i_mutex));
686 ubifs_assert(mutex_is_locked(&inode->i_mutex));
687 err = check_dir_empty(c, dentry->d_inode);
688 if (err)
689 return err;
690
691 err = ubifs_budget_space(c, &req);
692 if (err) {
693 if (err != -ENOSPC)
694 return err;
695 budgeted = 0;
696 }
697
698 lock_2_inodes(dir, inode);
699 inode->i_ctime = ubifs_current_time(dir);
700 clear_nlink(inode);
701 drop_nlink(dir);
702 dir->i_size -= sz_change;
703 dir_ui->ui_size = dir->i_size;
704 dir->i_mtime = dir->i_ctime = inode->i_ctime;
705 err = ubifs_jnl_update(c, dir, &dentry->d_name, inode, 1, 0);
706 if (err)
707 goto out_cancel;
708 unlock_2_inodes(dir, inode);
709
710 if (budgeted)
711 ubifs_release_budget(c, &req);
712 else {
713
714 c->nospace = c->nospace_rp = 0;
715 smp_wmb();
716 }
717 return 0;
718
719out_cancel:
720 dir->i_size += sz_change;
721 dir_ui->ui_size = dir->i_size;
722 inc_nlink(dir);
723 inc_nlink(inode);
724 inc_nlink(inode);
725 unlock_2_inodes(dir, inode);
726 if (budgeted)
727 ubifs_release_budget(c, &req);
728 return err;
729}
730
731static int ubifs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
732{
733 struct inode *inode;
734 struct ubifs_inode *dir_ui = ubifs_inode(dir);
735 struct ubifs_info *c = dir->i_sb->s_fs_info;
736 int err, sz_change = CALC_DENT_SIZE(dentry->d_name.len);
737 struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1 };
738
739
740
741
742
743
744 dbg_gen("dent '%.*s', mode %#x in dir ino %lu",
745 dentry->d_name.len, dentry->d_name.name, mode, dir->i_ino);
746
747 err = ubifs_budget_space(c, &req);
748 if (err)
749 return err;
750
751 inode = ubifs_new_inode(c, dir, S_IFDIR | mode);
752 if (IS_ERR(inode)) {
753 err = PTR_ERR(inode);
754 goto out_budg;
755 }
756
757 mutex_lock(&dir_ui->ui_mutex);
758 insert_inode_hash(inode);
759 inc_nlink(inode);
760 inc_nlink(dir);
761 dir->i_size += sz_change;
762 dir_ui->ui_size = dir->i_size;
763 dir->i_mtime = dir->i_ctime = inode->i_ctime;
764 err = ubifs_jnl_update(c, dir, &dentry->d_name, inode, 0, 0);
765 if (err) {
766 ubifs_err("cannot create directory, error %d", err);
767 goto out_cancel;
768 }
769 mutex_unlock(&dir_ui->ui_mutex);
770
771 ubifs_release_budget(c, &req);
772 d_instantiate(dentry, inode);
773 return 0;
774
775out_cancel:
776 dir->i_size -= sz_change;
777 dir_ui->ui_size = dir->i_size;
778 drop_nlink(dir);
779 mutex_unlock(&dir_ui->ui_mutex);
780 make_bad_inode(inode);
781 iput(inode);
782out_budg:
783 ubifs_release_budget(c, &req);
784 return err;
785}
786
787static int ubifs_mknod(struct inode *dir, struct dentry *dentry,
788 int mode, dev_t rdev)
789{
790 struct inode *inode;
791 struct ubifs_inode *ui;
792 struct ubifs_inode *dir_ui = ubifs_inode(dir);
793 struct ubifs_info *c = dir->i_sb->s_fs_info;
794 union ubifs_dev_desc *dev = NULL;
795 int sz_change = CALC_DENT_SIZE(dentry->d_name.len);
796 int err, devlen = 0;
797 struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1,
798 .new_ino_d = ALIGN(devlen, 8),
799 .dirtied_ino = 1 };
800
801
802
803
804
805
806 dbg_gen("dent '%.*s' in dir ino %lu",
807 dentry->d_name.len, dentry->d_name.name, dir->i_ino);
808
809 if (!new_valid_dev(rdev))
810 return -EINVAL;
811
812 if (S_ISBLK(mode) || S_ISCHR(mode)) {
813 dev = kmalloc(sizeof(union ubifs_dev_desc), GFP_NOFS);
814 if (!dev)
815 return -ENOMEM;
816 devlen = ubifs_encode_dev(dev, rdev);
817 }
818
819 err = ubifs_budget_space(c, &req);
820 if (err) {
821 kfree(dev);
822 return err;
823 }
824
825 inode = ubifs_new_inode(c, dir, mode);
826 if (IS_ERR(inode)) {
827 kfree(dev);
828 err = PTR_ERR(inode);
829 goto out_budg;
830 }
831
832 init_special_inode(inode, inode->i_mode, rdev);
833 inode->i_size = ubifs_inode(inode)->ui_size = devlen;
834 ui = ubifs_inode(inode);
835 ui->data = dev;
836 ui->data_len = devlen;
837
838 mutex_lock(&dir_ui->ui_mutex);
839 dir->i_size += sz_change;
840 dir_ui->ui_size = dir->i_size;
841 dir->i_mtime = dir->i_ctime = inode->i_ctime;
842 err = ubifs_jnl_update(c, dir, &dentry->d_name, inode, 0, 0);
843 if (err)
844 goto out_cancel;
845 mutex_unlock(&dir_ui->ui_mutex);
846
847 ubifs_release_budget(c, &req);
848 insert_inode_hash(inode);
849 d_instantiate(dentry, inode);
850 return 0;
851
852out_cancel:
853 dir->i_size -= sz_change;
854 dir_ui->ui_size = dir->i_size;
855 mutex_unlock(&dir_ui->ui_mutex);
856 make_bad_inode(inode);
857 iput(inode);
858out_budg:
859 ubifs_release_budget(c, &req);
860 return err;
861}
862
863static int ubifs_symlink(struct inode *dir, struct dentry *dentry,
864 const char *symname)
865{
866 struct inode *inode;
867 struct ubifs_inode *ui;
868 struct ubifs_inode *dir_ui = ubifs_inode(dir);
869 struct ubifs_info *c = dir->i_sb->s_fs_info;
870 int err, len = strlen(symname);
871 int sz_change = CALC_DENT_SIZE(dentry->d_name.len);
872 struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1,
873 .new_ino_d = ALIGN(len, 8),
874 .dirtied_ino = 1 };
875
876
877
878
879
880
881 dbg_gen("dent '%.*s', target '%s' in dir ino %lu", dentry->d_name.len,
882 dentry->d_name.name, symname, dir->i_ino);
883
884 if (len > UBIFS_MAX_INO_DATA)
885 return -ENAMETOOLONG;
886
887 err = ubifs_budget_space(c, &req);
888 if (err)
889 return err;
890
891 inode = ubifs_new_inode(c, dir, S_IFLNK | S_IRWXUGO);
892 if (IS_ERR(inode)) {
893 err = PTR_ERR(inode);
894 goto out_budg;
895 }
896
897 ui = ubifs_inode(inode);
898 ui->data = kmalloc(len + 1, GFP_NOFS);
899 if (!ui->data) {
900 err = -ENOMEM;
901 goto out_inode;
902 }
903
904 memcpy(ui->data, symname, len);
905 ((char *)ui->data)[len] = '\0';
906
907
908
909
910
911 ui->data_len = len;
912 inode->i_size = ubifs_inode(inode)->ui_size = len;
913
914 mutex_lock(&dir_ui->ui_mutex);
915 dir->i_size += sz_change;
916 dir_ui->ui_size = dir->i_size;
917 dir->i_mtime = dir->i_ctime = inode->i_ctime;
918 err = ubifs_jnl_update(c, dir, &dentry->d_name, inode, 0, 0);
919 if (err)
920 goto out_cancel;
921 mutex_unlock(&dir_ui->ui_mutex);
922
923 ubifs_release_budget(c, &req);
924 insert_inode_hash(inode);
925 d_instantiate(dentry, inode);
926 return 0;
927
928out_cancel:
929 dir->i_size -= sz_change;
930 dir_ui->ui_size = dir->i_size;
931 mutex_unlock(&dir_ui->ui_mutex);
932out_inode:
933 make_bad_inode(inode);
934 iput(inode);
935out_budg:
936 ubifs_release_budget(c, &req);
937 return err;
938}
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953static void lock_3_inodes(struct inode *inode1, struct inode *inode2,
954 struct inode *inode3)
955{
956 mutex_lock_nested(&ubifs_inode(inode1)->ui_mutex, WB_MUTEX_1);
957 if (inode2 != inode1)
958 mutex_lock_nested(&ubifs_inode(inode2)->ui_mutex, WB_MUTEX_2);
959 if (inode3)
960 mutex_lock_nested(&ubifs_inode(inode3)->ui_mutex, WB_MUTEX_3);
961}
962
963
964
965
966
967
968
969static void unlock_3_inodes(struct inode *inode1, struct inode *inode2,
970 struct inode *inode3)
971{
972 if (inode3)
973 mutex_unlock(&ubifs_inode(inode3)->ui_mutex);
974 if (inode1 != inode2)
975 mutex_unlock(&ubifs_inode(inode2)->ui_mutex);
976 mutex_unlock(&ubifs_inode(inode1)->ui_mutex);
977}
978
979static int ubifs_rename(struct inode *old_dir, struct dentry *old_dentry,
980 struct inode *new_dir, struct dentry *new_dentry)
981{
982 struct ubifs_info *c = old_dir->i_sb->s_fs_info;
983 struct inode *old_inode = old_dentry->d_inode;
984 struct inode *new_inode = new_dentry->d_inode;
985 struct ubifs_inode *old_inode_ui = ubifs_inode(old_inode);
986 int err, release, sync = 0, move = (new_dir != old_dir);
987 int is_dir = S_ISDIR(old_inode->i_mode);
988 int unlink = !!new_inode;
989 int new_sz = CALC_DENT_SIZE(new_dentry->d_name.len);
990 int old_sz = CALC_DENT_SIZE(old_dentry->d_name.len);
991 struct ubifs_budget_req req = { .new_dent = 1, .mod_dent = 1,
992 .dirtied_ino = 3 };
993 struct ubifs_budget_req ino_req = { .dirtied_ino = 1,
994 .dirtied_ino_d = ALIGN(old_inode_ui->data_len, 8) };
995 struct timespec time;
996
997
998
999
1000
1001
1002
1003
1004
1005
1006 dbg_gen("dent '%.*s' ino %lu in dir ino %lu to dent '%.*s' in "
1007 "dir ino %lu", old_dentry->d_name.len, old_dentry->d_name.name,
1008 old_inode->i_ino, old_dir->i_ino, new_dentry->d_name.len,
1009 new_dentry->d_name.name, new_dir->i_ino);
1010 ubifs_assert(mutex_is_locked(&old_dir->i_mutex));
1011 ubifs_assert(mutex_is_locked(&new_dir->i_mutex));
1012 if (unlink)
1013 ubifs_assert(mutex_is_locked(&new_inode->i_mutex));
1014
1015
1016 if (unlink && is_dir) {
1017 err = check_dir_empty(c, new_inode);
1018 if (err)
1019 return err;
1020 }
1021
1022 err = ubifs_budget_space(c, &req);
1023 if (err)
1024 return err;
1025 err = ubifs_budget_space(c, &ino_req);
1026 if (err) {
1027 ubifs_release_budget(c, &req);
1028 return err;
1029 }
1030
1031 lock_3_inodes(old_dir, new_dir, new_inode);
1032
1033
1034
1035
1036
1037 time = ubifs_current_time(old_dir);
1038 old_inode->i_ctime = time;
1039
1040
1041 if (is_dir) {
1042 if (move) {
1043
1044
1045
1046
1047 drop_nlink(old_dir);
1048
1049
1050
1051
1052 if (!unlink)
1053 inc_nlink(new_dir);
1054 } else {
1055
1056
1057
1058
1059
1060 if (unlink)
1061 drop_nlink(old_dir);
1062 }
1063 }
1064
1065 old_dir->i_size -= old_sz;
1066 ubifs_inode(old_dir)->ui_size = old_dir->i_size;
1067 old_dir->i_mtime = old_dir->i_ctime = time;
1068 new_dir->i_mtime = new_dir->i_ctime = time;
1069
1070
1071
1072
1073
1074
1075 if (unlink) {
1076
1077
1078
1079
1080
1081 if (is_dir)
1082 drop_nlink(new_inode);
1083 new_inode->i_ctime = time;
1084 drop_nlink(new_inode);
1085 } else {
1086 new_dir->i_size += new_sz;
1087 ubifs_inode(new_dir)->ui_size = new_dir->i_size;
1088 }
1089
1090
1091
1092
1093
1094
1095 if (IS_SYNC(old_inode)) {
1096 sync = IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir);
1097 if (unlink && IS_SYNC(new_inode))
1098 sync = 1;
1099 }
1100 err = ubifs_jnl_rename(c, old_dir, old_dentry, new_dir, new_dentry,
1101 sync);
1102 if (err)
1103 goto out_cancel;
1104
1105 unlock_3_inodes(old_dir, new_dir, new_inode);
1106 ubifs_release_budget(c, &req);
1107
1108 mutex_lock(&old_inode_ui->ui_mutex);
1109 release = old_inode_ui->dirty;
1110 mark_inode_dirty_sync(old_inode);
1111 mutex_unlock(&old_inode_ui->ui_mutex);
1112
1113 if (release)
1114 ubifs_release_budget(c, &ino_req);
1115 if (IS_SYNC(old_inode))
1116 err = old_inode->i_sb->s_op->write_inode(old_inode, NULL);
1117 return err;
1118
1119out_cancel:
1120 if (unlink) {
1121 if (is_dir)
1122 inc_nlink(new_inode);
1123 inc_nlink(new_inode);
1124 } else {
1125 new_dir->i_size -= new_sz;
1126 ubifs_inode(new_dir)->ui_size = new_dir->i_size;
1127 }
1128 old_dir->i_size += old_sz;
1129 ubifs_inode(old_dir)->ui_size = old_dir->i_size;
1130 if (is_dir) {
1131 if (move) {
1132 inc_nlink(old_dir);
1133 if (!unlink)
1134 drop_nlink(new_dir);
1135 } else {
1136 if (unlink)
1137 inc_nlink(old_dir);
1138 }
1139 }
1140 unlock_3_inodes(old_dir, new_dir, new_inode);
1141 ubifs_release_budget(c, &ino_req);
1142 ubifs_release_budget(c, &req);
1143 return err;
1144}
1145
1146int ubifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1147 struct kstat *stat)
1148{
1149 loff_t size;
1150 struct inode *inode = dentry->d_inode;
1151 struct ubifs_inode *ui = ubifs_inode(inode);
1152
1153 mutex_lock(&ui->ui_mutex);
1154 stat->dev = inode->i_sb->s_dev;
1155 stat->ino = inode->i_ino;
1156 stat->mode = inode->i_mode;
1157 stat->nlink = inode->i_nlink;
1158 stat->uid = inode->i_uid;
1159 stat->gid = inode->i_gid;
1160 stat->rdev = inode->i_rdev;
1161 stat->atime = inode->i_atime;
1162 stat->mtime = inode->i_mtime;
1163 stat->ctime = inode->i_ctime;
1164 stat->blksize = UBIFS_BLOCK_SIZE;
1165 stat->size = ui->ui_size;
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179 if (S_ISREG(inode->i_mode)) {
1180 size = ui->xattr_size;
1181 size += stat->size;
1182 size = ALIGN(size, UBIFS_BLOCK_SIZE);
1183
1184
1185
1186
1187 stat->blocks = size >> 9;
1188 } else
1189 stat->blocks = 0;
1190 mutex_unlock(&ui->ui_mutex);
1191 return 0;
1192}
1193
1194const struct inode_operations ubifs_dir_inode_operations = {
1195 .lookup = ubifs_lookup,
1196 .create = ubifs_create,
1197 .link = ubifs_link,
1198 .symlink = ubifs_symlink,
1199 .unlink = ubifs_unlink,
1200 .mkdir = ubifs_mkdir,
1201 .rmdir = ubifs_rmdir,
1202 .mknod = ubifs_mknod,
1203 .rename = ubifs_rename,
1204 .setattr = ubifs_setattr,
1205 .getattr = ubifs_getattr,
1206#ifdef CONFIG_UBIFS_FS_XATTR
1207 .setxattr = ubifs_setxattr,
1208 .getxattr = ubifs_getxattr,
1209 .listxattr = ubifs_listxattr,
1210 .removexattr = ubifs_removexattr,
1211#endif
1212};
1213
1214const struct file_operations ubifs_dir_operations = {
1215 .llseek = ubifs_dir_llseek,
1216 .release = ubifs_dir_release,
1217 .read = generic_read_dir,
1218 .readdir = ubifs_readdir,
1219 .fsync = ubifs_fsync,
1220 .unlocked_ioctl = ubifs_ioctl,
1221#ifdef CONFIG_COMPAT
1222 .compat_ioctl = ubifs_compat_ioctl,
1223#endif
1224};
1225