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27#include <linux/fs.h>
28#include <linux/pagemap.h>
29#include <linux/jbd.h>
30#include <linux/time.h>
31#include <linux/ext3_fs.h>
32#include <linux/ext3_jbd.h>
33#include <linux/fcntl.h>
34#include <linux/stat.h>
35#include <linux/string.h>
36#include <linux/quotaops.h>
37#include <linux/buffer_head.h>
38#include <linux/bio.h>
39
40#include "namei.h"
41#include "xattr.h"
42#include "acl.h"
43
44
45
46
47#define NAMEI_RA_CHUNKS 2
48#define NAMEI_RA_BLOCKS 4
49#define NAMEI_RA_SIZE (NAMEI_RA_CHUNKS * NAMEI_RA_BLOCKS)
50#define NAMEI_RA_INDEX(c,b) (((c) * NAMEI_RA_BLOCKS) + (b))
51
52static struct buffer_head *ext3_append(handle_t *handle,
53 struct inode *inode,
54 u32 *block, int *err)
55{
56 struct buffer_head *bh;
57
58 *block = inode->i_size >> inode->i_sb->s_blocksize_bits;
59
60 bh = ext3_bread(handle, inode, *block, 1, err);
61 if (bh) {
62 inode->i_size += inode->i_sb->s_blocksize;
63 EXT3_I(inode)->i_disksize = inode->i_size;
64 *err = ext3_journal_get_write_access(handle, bh);
65 if (*err) {
66 brelse(bh);
67 bh = NULL;
68 }
69 }
70 return bh;
71}
72
73#ifndef assert
74#define assert(test) J_ASSERT(test)
75#endif
76
77#ifdef DX_DEBUG
78#define dxtrace(command) command
79#else
80#define dxtrace(command)
81#endif
82
83struct fake_dirent
84{
85 __le32 inode;
86 __le16 rec_len;
87 u8 name_len;
88 u8 file_type;
89};
90
91struct dx_countlimit
92{
93 __le16 limit;
94 __le16 count;
95};
96
97struct dx_entry
98{
99 __le32 hash;
100 __le32 block;
101};
102
103
104
105
106
107
108
109struct dx_root
110{
111 struct fake_dirent dot;
112 char dot_name[4];
113 struct fake_dirent dotdot;
114 char dotdot_name[4];
115 struct dx_root_info
116 {
117 __le32 reserved_zero;
118 u8 hash_version;
119 u8 info_length;
120 u8 indirect_levels;
121 u8 unused_flags;
122 }
123 info;
124 struct dx_entry entries[0];
125};
126
127struct dx_node
128{
129 struct fake_dirent fake;
130 struct dx_entry entries[0];
131};
132
133
134struct dx_frame
135{
136 struct buffer_head *bh;
137 struct dx_entry *entries;
138 struct dx_entry *at;
139};
140
141struct dx_map_entry
142{
143 u32 hash;
144 u16 offs;
145 u16 size;
146};
147
148static inline unsigned dx_get_block (struct dx_entry *entry);
149static void dx_set_block (struct dx_entry *entry, unsigned value);
150static inline unsigned dx_get_hash (struct dx_entry *entry);
151static void dx_set_hash (struct dx_entry *entry, unsigned value);
152static unsigned dx_get_count (struct dx_entry *entries);
153static unsigned dx_get_limit (struct dx_entry *entries);
154static void dx_set_count (struct dx_entry *entries, unsigned value);
155static void dx_set_limit (struct dx_entry *entries, unsigned value);
156static unsigned dx_root_limit (struct inode *dir, unsigned infosize);
157static unsigned dx_node_limit (struct inode *dir);
158static struct dx_frame *dx_probe(struct qstr *entry,
159 struct inode *dir,
160 struct dx_hash_info *hinfo,
161 struct dx_frame *frame,
162 int *err);
163static void dx_release (struct dx_frame *frames);
164static int dx_make_map(struct ext3_dir_entry_2 *de, unsigned blocksize,
165 struct dx_hash_info *hinfo, struct dx_map_entry map[]);
166static void dx_sort_map(struct dx_map_entry *map, unsigned count);
167static struct ext3_dir_entry_2 *dx_move_dirents (char *from, char *to,
168 struct dx_map_entry *offsets, int count);
169static struct ext3_dir_entry_2 *dx_pack_dirents(char *base, unsigned blocksize);
170static void dx_insert_block (struct dx_frame *frame, u32 hash, u32 block);
171static int ext3_htree_next_block(struct inode *dir, __u32 hash,
172 struct dx_frame *frame,
173 struct dx_frame *frames,
174 __u32 *start_hash);
175static struct buffer_head * ext3_dx_find_entry(struct inode *dir,
176 struct qstr *entry, struct ext3_dir_entry_2 **res_dir,
177 int *err);
178static int ext3_dx_add_entry(handle_t *handle, struct dentry *dentry,
179 struct inode *inode);
180
181
182
183
184static inline struct ext3_dir_entry_2 *
185ext3_next_entry(struct ext3_dir_entry_2 *p)
186{
187 return (struct ext3_dir_entry_2 *)((char *)p +
188 ext3_rec_len_from_disk(p->rec_len));
189}
190
191
192
193
194
195
196static inline unsigned dx_get_block (struct dx_entry *entry)
197{
198 return le32_to_cpu(entry->block) & 0x00ffffff;
199}
200
201static inline void dx_set_block (struct dx_entry *entry, unsigned value)
202{
203 entry->block = cpu_to_le32(value);
204}
205
206static inline unsigned dx_get_hash (struct dx_entry *entry)
207{
208 return le32_to_cpu(entry->hash);
209}
210
211static inline void dx_set_hash (struct dx_entry *entry, unsigned value)
212{
213 entry->hash = cpu_to_le32(value);
214}
215
216static inline unsigned dx_get_count (struct dx_entry *entries)
217{
218 return le16_to_cpu(((struct dx_countlimit *) entries)->count);
219}
220
221static inline unsigned dx_get_limit (struct dx_entry *entries)
222{
223 return le16_to_cpu(((struct dx_countlimit *) entries)->limit);
224}
225
226static inline void dx_set_count (struct dx_entry *entries, unsigned value)
227{
228 ((struct dx_countlimit *) entries)->count = cpu_to_le16(value);
229}
230
231static inline void dx_set_limit (struct dx_entry *entries, unsigned value)
232{
233 ((struct dx_countlimit *) entries)->limit = cpu_to_le16(value);
234}
235
236static inline unsigned dx_root_limit (struct inode *dir, unsigned infosize)
237{
238 unsigned entry_space = dir->i_sb->s_blocksize - EXT3_DIR_REC_LEN(1) -
239 EXT3_DIR_REC_LEN(2) - infosize;
240 return entry_space / sizeof(struct dx_entry);
241}
242
243static inline unsigned dx_node_limit (struct inode *dir)
244{
245 unsigned entry_space = dir->i_sb->s_blocksize - EXT3_DIR_REC_LEN(0);
246 return entry_space / sizeof(struct dx_entry);
247}
248
249
250
251
252#ifdef DX_DEBUG
253static void dx_show_index (char * label, struct dx_entry *entries)
254{
255 int i, n = dx_get_count (entries);
256 printk("%s index ", label);
257 for (i = 0; i < n; i++)
258 {
259 printk("%x->%u ", i? dx_get_hash(entries + i): 0, dx_get_block(entries + i));
260 }
261 printk("\n");
262}
263
264struct stats
265{
266 unsigned names;
267 unsigned space;
268 unsigned bcount;
269};
270
271static struct stats dx_show_leaf(struct dx_hash_info *hinfo, struct ext3_dir_entry_2 *de,
272 int size, int show_names)
273{
274 unsigned names = 0, space = 0;
275 char *base = (char *) de;
276 struct dx_hash_info h = *hinfo;
277
278 printk("names: ");
279 while ((char *) de < base + size)
280 {
281 if (de->inode)
282 {
283 if (show_names)
284 {
285 int len = de->name_len;
286 char *name = de->name;
287 while (len--) printk("%c", *name++);
288 ext3fs_dirhash(de->name, de->name_len, &h);
289 printk(":%x.%u ", h.hash,
290 ((char *) de - base));
291 }
292 space += EXT3_DIR_REC_LEN(de->name_len);
293 names++;
294 }
295 de = ext3_next_entry(de);
296 }
297 printk("(%i)\n", names);
298 return (struct stats) { names, space, 1 };
299}
300
301struct stats dx_show_entries(struct dx_hash_info *hinfo, struct inode *dir,
302 struct dx_entry *entries, int levels)
303{
304 unsigned blocksize = dir->i_sb->s_blocksize;
305 unsigned count = dx_get_count (entries), names = 0, space = 0, i;
306 unsigned bcount = 0;
307 struct buffer_head *bh;
308 int err;
309 printk("%i indexed blocks...\n", count);
310 for (i = 0; i < count; i++, entries++)
311 {
312 u32 block = dx_get_block(entries), hash = i? dx_get_hash(entries): 0;
313 u32 range = i < count - 1? (dx_get_hash(entries + 1) - hash): ~hash;
314 struct stats stats;
315 printk("%s%3u:%03u hash %8x/%8x ",levels?"":" ", i, block, hash, range);
316 if (!(bh = ext3_bread (NULL,dir, block, 0,&err))) continue;
317 stats = levels?
318 dx_show_entries(hinfo, dir, ((struct dx_node *) bh->b_data)->entries, levels - 1):
319 dx_show_leaf(hinfo, (struct ext3_dir_entry_2 *) bh->b_data, blocksize, 0);
320 names += stats.names;
321 space += stats.space;
322 bcount += stats.bcount;
323 brelse (bh);
324 }
325 if (bcount)
326 printk("%snames %u, fullness %u (%u%%)\n", levels?"":" ",
327 names, space/bcount,(space/bcount)*100/blocksize);
328 return (struct stats) { names, space, bcount};
329}
330#endif
331
332
333
334
335
336
337
338
339
340
341static struct dx_frame *
342dx_probe(struct qstr *entry, struct inode *dir,
343 struct dx_hash_info *hinfo, struct dx_frame *frame_in, int *err)
344{
345 unsigned count, indirect;
346 struct dx_entry *at, *entries, *p, *q, *m;
347 struct dx_root *root;
348 struct buffer_head *bh;
349 struct dx_frame *frame = frame_in;
350 u32 hash;
351
352 frame->bh = NULL;
353 if (!(bh = ext3_bread (NULL,dir, 0, 0, err)))
354 goto fail;
355 root = (struct dx_root *) bh->b_data;
356 if (root->info.hash_version != DX_HASH_TEA &&
357 root->info.hash_version != DX_HASH_HALF_MD4 &&
358 root->info.hash_version != DX_HASH_LEGACY) {
359 ext3_warning(dir->i_sb, __func__,
360 "Unrecognised inode hash code %d",
361 root->info.hash_version);
362 brelse(bh);
363 *err = ERR_BAD_DX_DIR;
364 goto fail;
365 }
366 hinfo->hash_version = root->info.hash_version;
367 if (hinfo->hash_version <= DX_HASH_TEA)
368 hinfo->hash_version += EXT3_SB(dir->i_sb)->s_hash_unsigned;
369 hinfo->seed = EXT3_SB(dir->i_sb)->s_hash_seed;
370 if (entry)
371 ext3fs_dirhash(entry->name, entry->len, hinfo);
372 hash = hinfo->hash;
373
374 if (root->info.unused_flags & 1) {
375 ext3_warning(dir->i_sb, __func__,
376 "Unimplemented inode hash flags: %#06x",
377 root->info.unused_flags);
378 brelse(bh);
379 *err = ERR_BAD_DX_DIR;
380 goto fail;
381 }
382
383 if ((indirect = root->info.indirect_levels) > 1) {
384 ext3_warning(dir->i_sb, __func__,
385 "Unimplemented inode hash depth: %#06x",
386 root->info.indirect_levels);
387 brelse(bh);
388 *err = ERR_BAD_DX_DIR;
389 goto fail;
390 }
391
392 entries = (struct dx_entry *) (((char *)&root->info) +
393 root->info.info_length);
394
395 if (dx_get_limit(entries) != dx_root_limit(dir,
396 root->info.info_length)) {
397 ext3_warning(dir->i_sb, __func__,
398 "dx entry: limit != root limit");
399 brelse(bh);
400 *err = ERR_BAD_DX_DIR;
401 goto fail;
402 }
403
404 dxtrace (printk("Look up %x", hash));
405 while (1)
406 {
407 count = dx_get_count(entries);
408 if (!count || count > dx_get_limit(entries)) {
409 ext3_warning(dir->i_sb, __func__,
410 "dx entry: no count or count > limit");
411 brelse(bh);
412 *err = ERR_BAD_DX_DIR;
413 goto fail2;
414 }
415
416 p = entries + 1;
417 q = entries + count - 1;
418 while (p <= q)
419 {
420 m = p + (q - p)/2;
421 dxtrace(printk("."));
422 if (dx_get_hash(m) > hash)
423 q = m - 1;
424 else
425 p = m + 1;
426 }
427
428 if (0)
429 {
430 unsigned n = count - 1;
431 at = entries;
432 while (n--)
433 {
434 dxtrace(printk(","));
435 if (dx_get_hash(++at) > hash)
436 {
437 at--;
438 break;
439 }
440 }
441 assert (at == p - 1);
442 }
443
444 at = p - 1;
445 dxtrace(printk(" %x->%u\n", at == entries? 0: dx_get_hash(at), dx_get_block(at)));
446 frame->bh = bh;
447 frame->entries = entries;
448 frame->at = at;
449 if (!indirect--) return frame;
450 if (!(bh = ext3_bread (NULL,dir, dx_get_block(at), 0, err)))
451 goto fail2;
452 at = entries = ((struct dx_node *) bh->b_data)->entries;
453 if (dx_get_limit(entries) != dx_node_limit (dir)) {
454 ext3_warning(dir->i_sb, __func__,
455 "dx entry: limit != node limit");
456 brelse(bh);
457 *err = ERR_BAD_DX_DIR;
458 goto fail2;
459 }
460 frame++;
461 frame->bh = NULL;
462 }
463fail2:
464 while (frame >= frame_in) {
465 brelse(frame->bh);
466 frame--;
467 }
468fail:
469 if (*err == ERR_BAD_DX_DIR)
470 ext3_warning(dir->i_sb, __func__,
471 "Corrupt dir inode %ld, running e2fsck is "
472 "recommended.", dir->i_ino);
473 return NULL;
474}
475
476static void dx_release (struct dx_frame *frames)
477{
478 if (frames[0].bh == NULL)
479 return;
480
481 if (((struct dx_root *) frames[0].bh->b_data)->info.indirect_levels)
482 brelse(frames[1].bh);
483 brelse(frames[0].bh);
484}
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503static int ext3_htree_next_block(struct inode *dir, __u32 hash,
504 struct dx_frame *frame,
505 struct dx_frame *frames,
506 __u32 *start_hash)
507{
508 struct dx_frame *p;
509 struct buffer_head *bh;
510 int err, num_frames = 0;
511 __u32 bhash;
512
513 p = frame;
514
515
516
517
518
519
520
521 while (1) {
522 if (++(p->at) < p->entries + dx_get_count(p->entries))
523 break;
524 if (p == frames)
525 return 0;
526 num_frames++;
527 p--;
528 }
529
530
531
532
533
534
535
536
537 bhash = dx_get_hash(p->at);
538 if (start_hash)
539 *start_hash = bhash;
540 if ((hash & 1) == 0) {
541 if ((bhash & ~1) != hash)
542 return 0;
543 }
544
545
546
547
548 while (num_frames--) {
549 if (!(bh = ext3_bread(NULL, dir, dx_get_block(p->at),
550 0, &err)))
551 return err;
552 p++;
553 brelse (p->bh);
554 p->bh = bh;
555 p->at = p->entries = ((struct dx_node *) bh->b_data)->entries;
556 }
557 return 1;
558}
559
560
561
562
563
564
565
566static int htree_dirblock_to_tree(struct file *dir_file,
567 struct inode *dir, int block,
568 struct dx_hash_info *hinfo,
569 __u32 start_hash, __u32 start_minor_hash)
570{
571 struct buffer_head *bh;
572 struct ext3_dir_entry_2 *de, *top;
573 int err, count = 0;
574
575 dxtrace(printk("In htree dirblock_to_tree: block %d\n", block));
576 if (!(bh = ext3_bread (NULL, dir, block, 0, &err)))
577 return err;
578
579 de = (struct ext3_dir_entry_2 *) bh->b_data;
580 top = (struct ext3_dir_entry_2 *) ((char *) de +
581 dir->i_sb->s_blocksize -
582 EXT3_DIR_REC_LEN(0));
583 for (; de < top; de = ext3_next_entry(de)) {
584 if (!ext3_check_dir_entry("htree_dirblock_to_tree", dir, de, bh,
585 (block<<EXT3_BLOCK_SIZE_BITS(dir->i_sb))
586 +((char *)de - bh->b_data))) {
587
588 dir_file->f_pos = (dir_file->f_pos |
589 (dir->i_sb->s_blocksize - 1)) + 1;
590 brelse (bh);
591 return count;
592 }
593 ext3fs_dirhash(de->name, de->name_len, hinfo);
594 if ((hinfo->hash < start_hash) ||
595 ((hinfo->hash == start_hash) &&
596 (hinfo->minor_hash < start_minor_hash)))
597 continue;
598 if (de->inode == 0)
599 continue;
600 if ((err = ext3_htree_store_dirent(dir_file,
601 hinfo->hash, hinfo->minor_hash, de)) != 0) {
602 brelse(bh);
603 return err;
604 }
605 count++;
606 }
607 brelse(bh);
608 return count;
609}
610
611
612
613
614
615
616
617
618
619
620int ext3_htree_fill_tree(struct file *dir_file, __u32 start_hash,
621 __u32 start_minor_hash, __u32 *next_hash)
622{
623 struct dx_hash_info hinfo;
624 struct ext3_dir_entry_2 *de;
625 struct dx_frame frames[2], *frame;
626 struct inode *dir;
627 int block, err;
628 int count = 0;
629 int ret;
630 __u32 hashval;
631
632 dxtrace(printk("In htree_fill_tree, start hash: %x:%x\n", start_hash,
633 start_minor_hash));
634 dir = dir_file->f_path.dentry->d_inode;
635 if (!(EXT3_I(dir)->i_flags & EXT3_INDEX_FL)) {
636 hinfo.hash_version = EXT3_SB(dir->i_sb)->s_def_hash_version;
637 if (hinfo.hash_version <= DX_HASH_TEA)
638 hinfo.hash_version +=
639 EXT3_SB(dir->i_sb)->s_hash_unsigned;
640 hinfo.seed = EXT3_SB(dir->i_sb)->s_hash_seed;
641 count = htree_dirblock_to_tree(dir_file, dir, 0, &hinfo,
642 start_hash, start_minor_hash);
643 *next_hash = ~0;
644 return count;
645 }
646 hinfo.hash = start_hash;
647 hinfo.minor_hash = 0;
648 frame = dx_probe(NULL, dir_file->f_path.dentry->d_inode, &hinfo, frames, &err);
649 if (!frame)
650 return err;
651
652
653 if (!start_hash && !start_minor_hash) {
654 de = (struct ext3_dir_entry_2 *) frames[0].bh->b_data;
655 if ((err = ext3_htree_store_dirent(dir_file, 0, 0, de)) != 0)
656 goto errout;
657 count++;
658 }
659 if (start_hash < 2 || (start_hash ==2 && start_minor_hash==0)) {
660 de = (struct ext3_dir_entry_2 *) frames[0].bh->b_data;
661 de = ext3_next_entry(de);
662 if ((err = ext3_htree_store_dirent(dir_file, 2, 0, de)) != 0)
663 goto errout;
664 count++;
665 }
666
667 while (1) {
668 block = dx_get_block(frame->at);
669 ret = htree_dirblock_to_tree(dir_file, dir, block, &hinfo,
670 start_hash, start_minor_hash);
671 if (ret < 0) {
672 err = ret;
673 goto errout;
674 }
675 count += ret;
676 hashval = ~0;
677 ret = ext3_htree_next_block(dir, HASH_NB_ALWAYS,
678 frame, frames, &hashval);
679 *next_hash = hashval;
680 if (ret < 0) {
681 err = ret;
682 goto errout;
683 }
684
685
686
687
688
689 if ((ret == 0) ||
690 (count && ((hashval & 1) == 0)))
691 break;
692 }
693 dx_release(frames);
694 dxtrace(printk("Fill tree: returned %d entries, next hash: %x\n",
695 count, *next_hash));
696 return count;
697errout:
698 dx_release(frames);
699 return (err);
700}
701
702
703
704
705
706
707
708
709
710
711static int dx_make_map(struct ext3_dir_entry_2 *de, unsigned blocksize,
712 struct dx_hash_info *hinfo, struct dx_map_entry *map_tail)
713{
714 int count = 0;
715 char *base = (char *) de;
716 struct dx_hash_info h = *hinfo;
717
718 while ((char *) de < base + blocksize)
719 {
720 if (de->name_len && de->inode) {
721 ext3fs_dirhash(de->name, de->name_len, &h);
722 map_tail--;
723 map_tail->hash = h.hash;
724 map_tail->offs = (u16) ((char *) de - base);
725 map_tail->size = le16_to_cpu(de->rec_len);
726 count++;
727 cond_resched();
728 }
729
730 de = ext3_next_entry(de);
731 }
732 return count;
733}
734
735
736static void dx_sort_map (struct dx_map_entry *map, unsigned count)
737{
738 struct dx_map_entry *p, *q, *top = map + count - 1;
739 int more;
740
741 while (count > 2)
742 {
743 count = count*10/13;
744 if (count - 9 < 2)
745 count = 11;
746 for (p = top, q = p - count; q >= map; p--, q--)
747 if (p->hash < q->hash)
748 swap(*p, *q);
749 }
750
751 do {
752 more = 0;
753 q = top;
754 while (q-- > map)
755 {
756 if (q[1].hash >= q[0].hash)
757 continue;
758 swap(*(q+1), *q);
759 more = 1;
760 }
761 } while(more);
762}
763
764static void dx_insert_block(struct dx_frame *frame, u32 hash, u32 block)
765{
766 struct dx_entry *entries = frame->entries;
767 struct dx_entry *old = frame->at, *new = old + 1;
768 int count = dx_get_count(entries);
769
770 assert(count < dx_get_limit(entries));
771 assert(old < entries + count);
772 memmove(new + 1, new, (char *)(entries + count) - (char *)(new));
773 dx_set_hash(new, hash);
774 dx_set_block(new, block);
775 dx_set_count(entries, count + 1);
776}
777
778static void ext3_update_dx_flag(struct inode *inode)
779{
780 if (!EXT3_HAS_COMPAT_FEATURE(inode->i_sb,
781 EXT3_FEATURE_COMPAT_DIR_INDEX))
782 EXT3_I(inode)->i_flags &= ~EXT3_INDEX_FL;
783}
784
785
786
787
788
789
790
791static inline int ext3_match (int len, const char * const name,
792 struct ext3_dir_entry_2 * de)
793{
794 if (len != de->name_len)
795 return 0;
796 if (!de->inode)
797 return 0;
798 return !memcmp(name, de->name, len);
799}
800
801
802
803
804static inline int search_dirblock(struct buffer_head * bh,
805 struct inode *dir,
806 struct qstr *child,
807 unsigned long offset,
808 struct ext3_dir_entry_2 ** res_dir)
809{
810 struct ext3_dir_entry_2 * de;
811 char * dlimit;
812 int de_len;
813 const char *name = child->name;
814 int namelen = child->len;
815
816 de = (struct ext3_dir_entry_2 *) bh->b_data;
817 dlimit = bh->b_data + dir->i_sb->s_blocksize;
818 while ((char *) de < dlimit) {
819
820
821
822 if ((char *) de + namelen <= dlimit &&
823 ext3_match (namelen, name, de)) {
824
825 if (!ext3_check_dir_entry("ext3_find_entry",
826 dir, de, bh, offset))
827 return -1;
828 *res_dir = de;
829 return 1;
830 }
831
832 de_len = ext3_rec_len_from_disk(de->rec_len);
833 if (de_len <= 0)
834 return -1;
835 offset += de_len;
836 de = (struct ext3_dir_entry_2 *) ((char *) de + de_len);
837 }
838 return 0;
839}
840
841
842
843
844
845
846
847
848
849
850
851
852
853static struct buffer_head *ext3_find_entry(struct inode *dir,
854 struct qstr *entry,
855 struct ext3_dir_entry_2 **res_dir)
856{
857 struct super_block * sb;
858 struct buffer_head * bh_use[NAMEI_RA_SIZE];
859 struct buffer_head * bh, *ret = NULL;
860 unsigned long start, block, b;
861 const u8 *name = entry->name;
862 int ra_max = 0;
863
864 int ra_ptr = 0;
865
866 int num = 0;
867 int nblocks, i, err;
868 int namelen;
869
870 *res_dir = NULL;
871 sb = dir->i_sb;
872 namelen = entry->len;
873 if (namelen > EXT3_NAME_LEN)
874 return NULL;
875 if ((namelen <= 2) && (name[0] == '.') &&
876 (name[1] == '.' || name[1] == 0)) {
877
878
879
880
881 block = start = 0;
882 nblocks = 1;
883 goto restart;
884 }
885 if (is_dx(dir)) {
886 bh = ext3_dx_find_entry(dir, entry, res_dir, &err);
887
888
889
890
891
892 if (bh || (err != ERR_BAD_DX_DIR))
893 return bh;
894 dxtrace(printk("ext3_find_entry: dx failed, falling back\n"));
895 }
896 nblocks = dir->i_size >> EXT3_BLOCK_SIZE_BITS(sb);
897 start = EXT3_I(dir)->i_dir_start_lookup;
898 if (start >= nblocks)
899 start = 0;
900 block = start;
901restart:
902 do {
903
904
905
906 if (ra_ptr >= ra_max) {
907
908 ra_ptr = 0;
909 b = block;
910 for (ra_max = 0; ra_max < NAMEI_RA_SIZE; ra_max++) {
911
912
913
914
915
916 if (b >= nblocks || (num && block == start)) {
917 bh_use[ra_max] = NULL;
918 break;
919 }
920 num++;
921 bh = ext3_getblk(NULL, dir, b++, 0, &err);
922 bh_use[ra_max] = bh;
923 if (bh)
924 ll_rw_block(READ_META, 1, &bh);
925 }
926 }
927 if ((bh = bh_use[ra_ptr++]) == NULL)
928 goto next;
929 wait_on_buffer(bh);
930 if (!buffer_uptodate(bh)) {
931
932 ext3_error(sb, __func__, "reading directory #%lu "
933 "offset %lu", dir->i_ino, block);
934 brelse(bh);
935 goto next;
936 }
937 i = search_dirblock(bh, dir, entry,
938 block << EXT3_BLOCK_SIZE_BITS(sb), res_dir);
939 if (i == 1) {
940 EXT3_I(dir)->i_dir_start_lookup = block;
941 ret = bh;
942 goto cleanup_and_exit;
943 } else {
944 brelse(bh);
945 if (i < 0)
946 goto cleanup_and_exit;
947 }
948 next:
949 if (++block >= nblocks)
950 block = 0;
951 } while (block != start);
952
953
954
955
956
957 block = nblocks;
958 nblocks = dir->i_size >> EXT3_BLOCK_SIZE_BITS(sb);
959 if (block < nblocks) {
960 start = 0;
961 goto restart;
962 }
963
964cleanup_and_exit:
965
966 for (; ra_ptr < ra_max; ra_ptr++)
967 brelse (bh_use[ra_ptr]);
968 return ret;
969}
970
971static struct buffer_head * ext3_dx_find_entry(struct inode *dir,
972 struct qstr *entry, struct ext3_dir_entry_2 **res_dir,
973 int *err)
974{
975 struct super_block *sb = dir->i_sb;
976 struct dx_hash_info hinfo;
977 struct dx_frame frames[2], *frame;
978 struct buffer_head *bh;
979 unsigned long block;
980 int retval;
981
982 if (!(frame = dx_probe(entry, dir, &hinfo, frames, err)))
983 return NULL;
984 do {
985 block = dx_get_block(frame->at);
986 if (!(bh = ext3_bread (NULL,dir, block, 0, err)))
987 goto errout;
988
989 retval = search_dirblock(bh, dir, entry,
990 block << EXT3_BLOCK_SIZE_BITS(sb),
991 res_dir);
992 if (retval == 1) {
993 dx_release(frames);
994 return bh;
995 }
996 brelse(bh);
997 if (retval == -1) {
998 *err = ERR_BAD_DX_DIR;
999 goto errout;
1000 }
1001
1002
1003 retval = ext3_htree_next_block(dir, hinfo.hash, frame,
1004 frames, NULL);
1005 if (retval < 0) {
1006 ext3_warning(sb, __func__,
1007 "error reading index page in directory #%lu",
1008 dir->i_ino);
1009 *err = retval;
1010 goto errout;
1011 }
1012 } while (retval == 1);
1013
1014 *err = -ENOENT;
1015errout:
1016 dxtrace(printk("%s not found\n", name));
1017 dx_release (frames);
1018 return NULL;
1019}
1020
1021static struct dentry *ext3_lookup(struct inode * dir, struct dentry *dentry, struct nameidata *nd)
1022{
1023 struct inode * inode;
1024 struct ext3_dir_entry_2 * de;
1025 struct buffer_head * bh;
1026
1027 if (dentry->d_name.len > EXT3_NAME_LEN)
1028 return ERR_PTR(-ENAMETOOLONG);
1029
1030 bh = ext3_find_entry(dir, &dentry->d_name, &de);
1031 inode = NULL;
1032 if (bh) {
1033 unsigned long ino = le32_to_cpu(de->inode);
1034 brelse (bh);
1035 if (!ext3_valid_inum(dir->i_sb, ino)) {
1036 ext3_error(dir->i_sb, "ext3_lookup",
1037 "bad inode number: %lu", ino);
1038 return ERR_PTR(-EIO);
1039 }
1040 inode = ext3_iget(dir->i_sb, ino);
1041 if (IS_ERR(inode)) {
1042 if (PTR_ERR(inode) == -ESTALE) {
1043 ext3_error(dir->i_sb, __func__,
1044 "deleted inode referenced: %lu",
1045 ino);
1046 return ERR_PTR(-EIO);
1047 } else {
1048 return ERR_CAST(inode);
1049 }
1050 }
1051 }
1052 return d_splice_alias(inode, dentry);
1053}
1054
1055
1056struct dentry *ext3_get_parent(struct dentry *child)
1057{
1058 unsigned long ino;
1059 struct qstr dotdot = {.name = "..", .len = 2};
1060 struct ext3_dir_entry_2 * de;
1061 struct buffer_head *bh;
1062
1063 bh = ext3_find_entry(child->d_inode, &dotdot, &de);
1064 if (!bh)
1065 return ERR_PTR(-ENOENT);
1066 ino = le32_to_cpu(de->inode);
1067 brelse(bh);
1068
1069 if (!ext3_valid_inum(child->d_inode->i_sb, ino)) {
1070 ext3_error(child->d_inode->i_sb, "ext3_get_parent",
1071 "bad inode number: %lu", ino);
1072 return ERR_PTR(-EIO);
1073 }
1074
1075 return d_obtain_alias(ext3_iget(child->d_inode->i_sb, ino));
1076}
1077
1078#define S_SHIFT 12
1079static unsigned char ext3_type_by_mode[S_IFMT >> S_SHIFT] = {
1080 [S_IFREG >> S_SHIFT] = EXT3_FT_REG_FILE,
1081 [S_IFDIR >> S_SHIFT] = EXT3_FT_DIR,
1082 [S_IFCHR >> S_SHIFT] = EXT3_FT_CHRDEV,
1083 [S_IFBLK >> S_SHIFT] = EXT3_FT_BLKDEV,
1084 [S_IFIFO >> S_SHIFT] = EXT3_FT_FIFO,
1085 [S_IFSOCK >> S_SHIFT] = EXT3_FT_SOCK,
1086 [S_IFLNK >> S_SHIFT] = EXT3_FT_SYMLINK,
1087};
1088
1089static inline void ext3_set_de_type(struct super_block *sb,
1090 struct ext3_dir_entry_2 *de,
1091 umode_t mode) {
1092 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_FILETYPE))
1093 de->file_type = ext3_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
1094}
1095
1096
1097
1098
1099
1100static struct ext3_dir_entry_2 *
1101dx_move_dirents(char *from, char *to, struct dx_map_entry *map, int count)
1102{
1103 unsigned rec_len = 0;
1104
1105 while (count--) {
1106 struct ext3_dir_entry_2 *de = (struct ext3_dir_entry_2 *) (from + map->offs);
1107 rec_len = EXT3_DIR_REC_LEN(de->name_len);
1108 memcpy (to, de, rec_len);
1109 ((struct ext3_dir_entry_2 *) to)->rec_len =
1110 ext3_rec_len_to_disk(rec_len);
1111 de->inode = 0;
1112 map++;
1113 to += rec_len;
1114 }
1115 return (struct ext3_dir_entry_2 *) (to - rec_len);
1116}
1117
1118
1119
1120
1121
1122static struct ext3_dir_entry_2 *dx_pack_dirents(char *base, unsigned blocksize)
1123{
1124 struct ext3_dir_entry_2 *next, *to, *prev;
1125 struct ext3_dir_entry_2 *de = (struct ext3_dir_entry_2 *)base;
1126 unsigned rec_len = 0;
1127
1128 prev = to = de;
1129 while ((char *)de < base + blocksize) {
1130 next = ext3_next_entry(de);
1131 if (de->inode && de->name_len) {
1132 rec_len = EXT3_DIR_REC_LEN(de->name_len);
1133 if (de > to)
1134 memmove(to, de, rec_len);
1135 to->rec_len = ext3_rec_len_to_disk(rec_len);
1136 prev = to;
1137 to = (struct ext3_dir_entry_2 *) (((char *) to) + rec_len);
1138 }
1139 de = next;
1140 }
1141 return prev;
1142}
1143
1144
1145
1146
1147
1148
1149static struct ext3_dir_entry_2 *do_split(handle_t *handle, struct inode *dir,
1150 struct buffer_head **bh,struct dx_frame *frame,
1151 struct dx_hash_info *hinfo, int *error)
1152{
1153 unsigned blocksize = dir->i_sb->s_blocksize;
1154 unsigned count, continued;
1155 struct buffer_head *bh2;
1156 u32 newblock;
1157 u32 hash2;
1158 struct dx_map_entry *map;
1159 char *data1 = (*bh)->b_data, *data2;
1160 unsigned split, move, size;
1161 struct ext3_dir_entry_2 *de = NULL, *de2;
1162 int err = 0, i;
1163
1164 bh2 = ext3_append (handle, dir, &newblock, &err);
1165 if (!(bh2)) {
1166 brelse(*bh);
1167 *bh = NULL;
1168 goto errout;
1169 }
1170
1171 BUFFER_TRACE(*bh, "get_write_access");
1172 err = ext3_journal_get_write_access(handle, *bh);
1173 if (err)
1174 goto journal_error;
1175
1176 BUFFER_TRACE(frame->bh, "get_write_access");
1177 err = ext3_journal_get_write_access(handle, frame->bh);
1178 if (err)
1179 goto journal_error;
1180
1181 data2 = bh2->b_data;
1182
1183
1184 map = (struct dx_map_entry *) (data2 + blocksize);
1185 count = dx_make_map ((struct ext3_dir_entry_2 *) data1,
1186 blocksize, hinfo, map);
1187 map -= count;
1188 dx_sort_map (map, count);
1189
1190 size = 0;
1191 move = 0;
1192 for (i = count-1; i >= 0; i--) {
1193
1194 if (size + map[i].size/2 > blocksize/2)
1195 break;
1196 size += map[i].size;
1197 move++;
1198 }
1199
1200 split = count - move;
1201 hash2 = map[split].hash;
1202 continued = hash2 == map[split - 1].hash;
1203 dxtrace(printk("Split block %i at %x, %i/%i\n",
1204 dx_get_block(frame->at), hash2, split, count-split));
1205
1206
1207 de2 = dx_move_dirents(data1, data2, map + split, count - split);
1208 de = dx_pack_dirents(data1,blocksize);
1209 de->rec_len = ext3_rec_len_to_disk(data1 + blocksize - (char *) de);
1210 de2->rec_len = ext3_rec_len_to_disk(data2 + blocksize - (char *) de2);
1211 dxtrace(dx_show_leaf (hinfo, (struct ext3_dir_entry_2 *) data1, blocksize, 1));
1212 dxtrace(dx_show_leaf (hinfo, (struct ext3_dir_entry_2 *) data2, blocksize, 1));
1213
1214
1215 if (hinfo->hash >= hash2)
1216 {
1217 swap(*bh, bh2);
1218 de = de2;
1219 }
1220 dx_insert_block (frame, hash2 + continued, newblock);
1221 err = ext3_journal_dirty_metadata (handle, bh2);
1222 if (err)
1223 goto journal_error;
1224 err = ext3_journal_dirty_metadata (handle, frame->bh);
1225 if (err)
1226 goto journal_error;
1227 brelse (bh2);
1228 dxtrace(dx_show_index ("frame", frame->entries));
1229 return de;
1230
1231journal_error:
1232 brelse(*bh);
1233 brelse(bh2);
1234 *bh = NULL;
1235 ext3_std_error(dir->i_sb, err);
1236errout:
1237 *error = err;
1238 return NULL;
1239}
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253static int add_dirent_to_buf(handle_t *handle, struct dentry *dentry,
1254 struct inode *inode, struct ext3_dir_entry_2 *de,
1255 struct buffer_head * bh)
1256{
1257 struct inode *dir = dentry->d_parent->d_inode;
1258 const char *name = dentry->d_name.name;
1259 int namelen = dentry->d_name.len;
1260 unsigned long offset = 0;
1261 unsigned short reclen;
1262 int nlen, rlen, err;
1263 char *top;
1264
1265 reclen = EXT3_DIR_REC_LEN(namelen);
1266 if (!de) {
1267 de = (struct ext3_dir_entry_2 *)bh->b_data;
1268 top = bh->b_data + dir->i_sb->s_blocksize - reclen;
1269 while ((char *) de <= top) {
1270 if (!ext3_check_dir_entry("ext3_add_entry", dir, de,
1271 bh, offset)) {
1272 brelse (bh);
1273 return -EIO;
1274 }
1275 if (ext3_match (namelen, name, de)) {
1276 brelse (bh);
1277 return -EEXIST;
1278 }
1279 nlen = EXT3_DIR_REC_LEN(de->name_len);
1280 rlen = ext3_rec_len_from_disk(de->rec_len);
1281 if ((de->inode? rlen - nlen: rlen) >= reclen)
1282 break;
1283 de = (struct ext3_dir_entry_2 *)((char *)de + rlen);
1284 offset += rlen;
1285 }
1286 if ((char *) de > top)
1287 return -ENOSPC;
1288 }
1289 BUFFER_TRACE(bh, "get_write_access");
1290 err = ext3_journal_get_write_access(handle, bh);
1291 if (err) {
1292 ext3_std_error(dir->i_sb, err);
1293 brelse(bh);
1294 return err;
1295 }
1296
1297
1298 nlen = EXT3_DIR_REC_LEN(de->name_len);
1299 rlen = ext3_rec_len_from_disk(de->rec_len);
1300 if (de->inode) {
1301 struct ext3_dir_entry_2 *de1 = (struct ext3_dir_entry_2 *)((char *)de + nlen);
1302 de1->rec_len = ext3_rec_len_to_disk(rlen - nlen);
1303 de->rec_len = ext3_rec_len_to_disk(nlen);
1304 de = de1;
1305 }
1306 de->file_type = EXT3_FT_UNKNOWN;
1307 if (inode) {
1308 de->inode = cpu_to_le32(inode->i_ino);
1309 ext3_set_de_type(dir->i_sb, de, inode->i_mode);
1310 } else
1311 de->inode = 0;
1312 de->name_len = namelen;
1313 memcpy (de->name, name, namelen);
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325 dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
1326 ext3_update_dx_flag(dir);
1327 dir->i_version++;
1328 ext3_mark_inode_dirty(handle, dir);
1329 BUFFER_TRACE(bh, "call ext3_journal_dirty_metadata");
1330 err = ext3_journal_dirty_metadata(handle, bh);
1331 if (err)
1332 ext3_std_error(dir->i_sb, err);
1333 brelse(bh);
1334 return 0;
1335}
1336
1337
1338
1339
1340
1341static int make_indexed_dir(handle_t *handle, struct dentry *dentry,
1342 struct inode *inode, struct buffer_head *bh)
1343{
1344 struct inode *dir = dentry->d_parent->d_inode;
1345 const char *name = dentry->d_name.name;
1346 int namelen = dentry->d_name.len;
1347 struct buffer_head *bh2;
1348 struct dx_root *root;
1349 struct dx_frame frames[2], *frame;
1350 struct dx_entry *entries;
1351 struct ext3_dir_entry_2 *de, *de2;
1352 char *data1, *top;
1353 unsigned len;
1354 int retval;
1355 unsigned blocksize;
1356 struct dx_hash_info hinfo;
1357 u32 block;
1358 struct fake_dirent *fde;
1359
1360 blocksize = dir->i_sb->s_blocksize;
1361 dxtrace(printk(KERN_DEBUG "Creating index: inode %lu\n", dir->i_ino));
1362 retval = ext3_journal_get_write_access(handle, bh);
1363 if (retval) {
1364 ext3_std_error(dir->i_sb, retval);
1365 brelse(bh);
1366 return retval;
1367 }
1368 root = (struct dx_root *) bh->b_data;
1369
1370
1371 fde = &root->dotdot;
1372 de = (struct ext3_dir_entry_2 *)((char *)fde +
1373 ext3_rec_len_from_disk(fde->rec_len));
1374 if ((char *) de >= (((char *) root) + blocksize)) {
1375 ext3_error(dir->i_sb, __func__,
1376 "invalid rec_len for '..' in inode %lu",
1377 dir->i_ino);
1378 brelse(bh);
1379 return -EIO;
1380 }
1381 len = ((char *) root) + blocksize - (char *) de;
1382
1383 bh2 = ext3_append (handle, dir, &block, &retval);
1384 if (!(bh2)) {
1385 brelse(bh);
1386 return retval;
1387 }
1388 EXT3_I(dir)->i_flags |= EXT3_INDEX_FL;
1389 data1 = bh2->b_data;
1390
1391 memcpy (data1, de, len);
1392 de = (struct ext3_dir_entry_2 *) data1;
1393 top = data1 + len;
1394 while ((char *)(de2 = ext3_next_entry(de)) < top)
1395 de = de2;
1396 de->rec_len = ext3_rec_len_to_disk(data1 + blocksize - (char *) de);
1397
1398 de = (struct ext3_dir_entry_2 *) (&root->dotdot);
1399 de->rec_len = ext3_rec_len_to_disk(blocksize - EXT3_DIR_REC_LEN(2));
1400 memset (&root->info, 0, sizeof(root->info));
1401 root->info.info_length = sizeof(root->info);
1402 root->info.hash_version = EXT3_SB(dir->i_sb)->s_def_hash_version;
1403 entries = root->entries;
1404 dx_set_block (entries, 1);
1405 dx_set_count (entries, 1);
1406 dx_set_limit (entries, dx_root_limit(dir, sizeof(root->info)));
1407
1408
1409 hinfo.hash_version = root->info.hash_version;
1410 if (hinfo.hash_version <= DX_HASH_TEA)
1411 hinfo.hash_version += EXT3_SB(dir->i_sb)->s_hash_unsigned;
1412 hinfo.seed = EXT3_SB(dir->i_sb)->s_hash_seed;
1413 ext3fs_dirhash(name, namelen, &hinfo);
1414 frame = frames;
1415 frame->entries = entries;
1416 frame->at = entries;
1417 frame->bh = bh;
1418 bh = bh2;
1419 de = do_split(handle,dir, &bh, frame, &hinfo, &retval);
1420 dx_release (frames);
1421 if (!(de))
1422 return retval;
1423
1424 return add_dirent_to_buf(handle, dentry, inode, de, bh);
1425}
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437static int ext3_add_entry (handle_t *handle, struct dentry *dentry,
1438 struct inode *inode)
1439{
1440 struct inode *dir = dentry->d_parent->d_inode;
1441 struct buffer_head * bh;
1442 struct ext3_dir_entry_2 *de;
1443 struct super_block * sb;
1444 int retval;
1445 int dx_fallback=0;
1446 unsigned blocksize;
1447 u32 block, blocks;
1448
1449 sb = dir->i_sb;
1450 blocksize = sb->s_blocksize;
1451 if (!dentry->d_name.len)
1452 return -EINVAL;
1453 if (is_dx(dir)) {
1454 retval = ext3_dx_add_entry(handle, dentry, inode);
1455 if (!retval || (retval != ERR_BAD_DX_DIR))
1456 return retval;
1457 EXT3_I(dir)->i_flags &= ~EXT3_INDEX_FL;
1458 dx_fallback++;
1459 ext3_mark_inode_dirty(handle, dir);
1460 }
1461 blocks = dir->i_size >> sb->s_blocksize_bits;
1462 for (block = 0; block < blocks; block++) {
1463 bh = ext3_bread(handle, dir, block, 0, &retval);
1464 if(!bh)
1465 return retval;
1466 retval = add_dirent_to_buf(handle, dentry, inode, NULL, bh);
1467 if (retval != -ENOSPC)
1468 return retval;
1469
1470 if (blocks == 1 && !dx_fallback &&
1471 EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_DIR_INDEX))
1472 return make_indexed_dir(handle, dentry, inode, bh);
1473 brelse(bh);
1474 }
1475 bh = ext3_append(handle, dir, &block, &retval);
1476 if (!bh)
1477 return retval;
1478 de = (struct ext3_dir_entry_2 *) bh->b_data;
1479 de->inode = 0;
1480 de->rec_len = ext3_rec_len_to_disk(blocksize);
1481 return add_dirent_to_buf(handle, dentry, inode, de, bh);
1482}
1483
1484
1485
1486
1487static int ext3_dx_add_entry(handle_t *handle, struct dentry *dentry,
1488 struct inode *inode)
1489{
1490 struct dx_frame frames[2], *frame;
1491 struct dx_entry *entries, *at;
1492 struct dx_hash_info hinfo;
1493 struct buffer_head * bh;
1494 struct inode *dir = dentry->d_parent->d_inode;
1495 struct super_block * sb = dir->i_sb;
1496 struct ext3_dir_entry_2 *de;
1497 int err;
1498
1499 frame = dx_probe(&dentry->d_name, dir, &hinfo, frames, &err);
1500 if (!frame)
1501 return err;
1502 entries = frame->entries;
1503 at = frame->at;
1504
1505 if (!(bh = ext3_bread(handle,dir, dx_get_block(frame->at), 0, &err)))
1506 goto cleanup;
1507
1508 BUFFER_TRACE(bh, "get_write_access");
1509 err = ext3_journal_get_write_access(handle, bh);
1510 if (err)
1511 goto journal_error;
1512
1513 err = add_dirent_to_buf(handle, dentry, inode, NULL, bh);
1514 if (err != -ENOSPC) {
1515 bh = NULL;
1516 goto cleanup;
1517 }
1518
1519
1520 dxtrace(printk("using %u of %u node entries\n",
1521 dx_get_count(entries), dx_get_limit(entries)));
1522
1523 if (dx_get_count(entries) == dx_get_limit(entries)) {
1524 u32 newblock;
1525 unsigned icount = dx_get_count(entries);
1526 int levels = frame - frames;
1527 struct dx_entry *entries2;
1528 struct dx_node *node2;
1529 struct buffer_head *bh2;
1530
1531 if (levels && (dx_get_count(frames->entries) ==
1532 dx_get_limit(frames->entries))) {
1533 ext3_warning(sb, __func__,
1534 "Directory index full!");
1535 err = -ENOSPC;
1536 goto cleanup;
1537 }
1538 bh2 = ext3_append (handle, dir, &newblock, &err);
1539 if (!(bh2))
1540 goto cleanup;
1541 node2 = (struct dx_node *)(bh2->b_data);
1542 entries2 = node2->entries;
1543 node2->fake.rec_len = ext3_rec_len_to_disk(sb->s_blocksize);
1544 node2->fake.inode = 0;
1545 BUFFER_TRACE(frame->bh, "get_write_access");
1546 err = ext3_journal_get_write_access(handle, frame->bh);
1547 if (err)
1548 goto journal_error;
1549 if (levels) {
1550 unsigned icount1 = icount/2, icount2 = icount - icount1;
1551 unsigned hash2 = dx_get_hash(entries + icount1);
1552 dxtrace(printk("Split index %i/%i\n", icount1, icount2));
1553
1554 BUFFER_TRACE(frame->bh, "get_write_access");
1555 err = ext3_journal_get_write_access(handle,
1556 frames[0].bh);
1557 if (err)
1558 goto journal_error;
1559
1560 memcpy ((char *) entries2, (char *) (entries + icount1),
1561 icount2 * sizeof(struct dx_entry));
1562 dx_set_count (entries, icount1);
1563 dx_set_count (entries2, icount2);
1564 dx_set_limit (entries2, dx_node_limit(dir));
1565
1566
1567 if (at - entries >= icount1) {
1568 frame->at = at = at - entries - icount1 + entries2;
1569 frame->entries = entries = entries2;
1570 swap(frame->bh, bh2);
1571 }
1572 dx_insert_block (frames + 0, hash2, newblock);
1573 dxtrace(dx_show_index ("node", frames[1].entries));
1574 dxtrace(dx_show_index ("node",
1575 ((struct dx_node *) bh2->b_data)->entries));
1576 err = ext3_journal_dirty_metadata(handle, bh2);
1577 if (err)
1578 goto journal_error;
1579 brelse (bh2);
1580 } else {
1581 dxtrace(printk("Creating second level index...\n"));
1582 memcpy((char *) entries2, (char *) entries,
1583 icount * sizeof(struct dx_entry));
1584 dx_set_limit(entries2, dx_node_limit(dir));
1585
1586
1587 dx_set_count(entries, 1);
1588 dx_set_block(entries + 0, newblock);
1589 ((struct dx_root *) frames[0].bh->b_data)->info.indirect_levels = 1;
1590
1591
1592 frame = frames + 1;
1593 frame->at = at = at - entries + entries2;
1594 frame->entries = entries = entries2;
1595 frame->bh = bh2;
1596 err = ext3_journal_get_write_access(handle,
1597 frame->bh);
1598 if (err)
1599 goto journal_error;
1600 }
1601 err = ext3_journal_dirty_metadata(handle, frames[0].bh);
1602 if (err)
1603 goto journal_error;
1604 }
1605 de = do_split(handle, dir, &bh, frame, &hinfo, &err);
1606 if (!de)
1607 goto cleanup;
1608 err = add_dirent_to_buf(handle, dentry, inode, de, bh);
1609 bh = NULL;
1610 goto cleanup;
1611
1612journal_error:
1613 ext3_std_error(dir->i_sb, err);
1614cleanup:
1615 if (bh)
1616 brelse(bh);
1617 dx_release(frames);
1618 return err;
1619}
1620
1621
1622
1623
1624
1625static int ext3_delete_entry (handle_t *handle,
1626 struct inode * dir,
1627 struct ext3_dir_entry_2 * de_del,
1628 struct buffer_head * bh)
1629{
1630 struct ext3_dir_entry_2 * de, * pde;
1631 int i;
1632
1633 i = 0;
1634 pde = NULL;
1635 de = (struct ext3_dir_entry_2 *) bh->b_data;
1636 while (i < bh->b_size) {
1637 if (!ext3_check_dir_entry("ext3_delete_entry", dir, de, bh, i))
1638 return -EIO;
1639 if (de == de_del) {
1640 int err;
1641
1642 BUFFER_TRACE(bh, "get_write_access");
1643 err = ext3_journal_get_write_access(handle, bh);
1644 if (err)
1645 goto journal_error;
1646
1647 if (pde)
1648 pde->rec_len = ext3_rec_len_to_disk(
1649 ext3_rec_len_from_disk(pde->rec_len) +
1650 ext3_rec_len_from_disk(de->rec_len));
1651 else
1652 de->inode = 0;
1653 dir->i_version++;
1654 BUFFER_TRACE(bh, "call ext3_journal_dirty_metadata");
1655 err = ext3_journal_dirty_metadata(handle, bh);
1656 if (err) {
1657journal_error:
1658 ext3_std_error(dir->i_sb, err);
1659 return err;
1660 }
1661 return 0;
1662 }
1663 i += ext3_rec_len_from_disk(de->rec_len);
1664 pde = de;
1665 de = ext3_next_entry(de);
1666 }
1667 return -ENOENT;
1668}
1669
1670static int ext3_add_nondir(handle_t *handle,
1671 struct dentry *dentry, struct inode *inode)
1672{
1673 int err = ext3_add_entry(handle, dentry, inode);
1674 if (!err) {
1675 ext3_mark_inode_dirty(handle, inode);
1676 d_instantiate(dentry, inode);
1677 unlock_new_inode(inode);
1678 return 0;
1679 }
1680 drop_nlink(inode);
1681 unlock_new_inode(inode);
1682 iput(inode);
1683 return err;
1684}
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694static int ext3_create (struct inode * dir, struct dentry * dentry, int mode,
1695 struct nameidata *nd)
1696{
1697 handle_t *handle;
1698 struct inode * inode;
1699 int err, retries = 0;
1700
1701 dquot_initialize(dir);
1702
1703retry:
1704 handle = ext3_journal_start(dir, EXT3_DATA_TRANS_BLOCKS(dir->i_sb) +
1705 EXT3_INDEX_EXTRA_TRANS_BLOCKS + 3 +
1706 EXT3_MAXQUOTAS_INIT_BLOCKS(dir->i_sb));
1707 if (IS_ERR(handle))
1708 return PTR_ERR(handle);
1709
1710 if (IS_DIRSYNC(dir))
1711 handle->h_sync = 1;
1712
1713 inode = ext3_new_inode (handle, dir, mode);
1714 err = PTR_ERR(inode);
1715 if (!IS_ERR(inode)) {
1716 inode->i_op = &ext3_file_inode_operations;
1717 inode->i_fop = &ext3_file_operations;
1718 ext3_set_aops(inode);
1719 err = ext3_add_nondir(handle, dentry, inode);
1720 }
1721 ext3_journal_stop(handle);
1722 if (err == -ENOSPC && ext3_should_retry_alloc(dir->i_sb, &retries))
1723 goto retry;
1724 return err;
1725}
1726
1727static int ext3_mknod (struct inode * dir, struct dentry *dentry,
1728 int mode, dev_t rdev)
1729{
1730 handle_t *handle;
1731 struct inode *inode;
1732 int err, retries = 0;
1733
1734 if (!new_valid_dev(rdev))
1735 return -EINVAL;
1736
1737 dquot_initialize(dir);
1738
1739retry:
1740 handle = ext3_journal_start(dir, EXT3_DATA_TRANS_BLOCKS(dir->i_sb) +
1741 EXT3_INDEX_EXTRA_TRANS_BLOCKS + 3 +
1742 EXT3_MAXQUOTAS_INIT_BLOCKS(dir->i_sb));
1743 if (IS_ERR(handle))
1744 return PTR_ERR(handle);
1745
1746 if (IS_DIRSYNC(dir))
1747 handle->h_sync = 1;
1748
1749 inode = ext3_new_inode (handle, dir, mode);
1750 err = PTR_ERR(inode);
1751 if (!IS_ERR(inode)) {
1752 init_special_inode(inode, inode->i_mode, rdev);
1753#ifdef CONFIG_EXT3_FS_XATTR
1754 inode->i_op = &ext3_special_inode_operations;
1755#endif
1756 err = ext3_add_nondir(handle, dentry, inode);
1757 }
1758 ext3_journal_stop(handle);
1759 if (err == -ENOSPC && ext3_should_retry_alloc(dir->i_sb, &retries))
1760 goto retry;
1761 return err;
1762}
1763
1764static int ext3_mkdir(struct inode * dir, struct dentry * dentry, int mode)
1765{
1766 handle_t *handle;
1767 struct inode * inode;
1768 struct buffer_head * dir_block = NULL;
1769 struct ext3_dir_entry_2 * de;
1770 int err, retries = 0;
1771
1772 if (dir->i_nlink >= EXT3_LINK_MAX)
1773 return -EMLINK;
1774
1775 dquot_initialize(dir);
1776
1777retry:
1778 handle = ext3_journal_start(dir, EXT3_DATA_TRANS_BLOCKS(dir->i_sb) +
1779 EXT3_INDEX_EXTRA_TRANS_BLOCKS + 3 +
1780 EXT3_MAXQUOTAS_INIT_BLOCKS(dir->i_sb));
1781 if (IS_ERR(handle))
1782 return PTR_ERR(handle);
1783
1784 if (IS_DIRSYNC(dir))
1785 handle->h_sync = 1;
1786
1787 inode = ext3_new_inode (handle, dir, S_IFDIR | mode);
1788 err = PTR_ERR(inode);
1789 if (IS_ERR(inode))
1790 goto out_stop;
1791
1792 inode->i_op = &ext3_dir_inode_operations;
1793 inode->i_fop = &ext3_dir_operations;
1794 inode->i_size = EXT3_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1795 dir_block = ext3_bread (handle, inode, 0, 1, &err);
1796 if (!dir_block)
1797 goto out_clear_inode;
1798
1799 BUFFER_TRACE(dir_block, "get_write_access");
1800 err = ext3_journal_get_write_access(handle, dir_block);
1801 if (err)
1802 goto out_clear_inode;
1803
1804 de = (struct ext3_dir_entry_2 *) dir_block->b_data;
1805 de->inode = cpu_to_le32(inode->i_ino);
1806 de->name_len = 1;
1807 de->rec_len = ext3_rec_len_to_disk(EXT3_DIR_REC_LEN(de->name_len));
1808 strcpy (de->name, ".");
1809 ext3_set_de_type(dir->i_sb, de, S_IFDIR);
1810 de = ext3_next_entry(de);
1811 de->inode = cpu_to_le32(dir->i_ino);
1812 de->rec_len = ext3_rec_len_to_disk(inode->i_sb->s_blocksize -
1813 EXT3_DIR_REC_LEN(1));
1814 de->name_len = 2;
1815 strcpy (de->name, "..");
1816 ext3_set_de_type(dir->i_sb, de, S_IFDIR);
1817 inode->i_nlink = 2;
1818 BUFFER_TRACE(dir_block, "call ext3_journal_dirty_metadata");
1819 err = ext3_journal_dirty_metadata(handle, dir_block);
1820 if (err)
1821 goto out_clear_inode;
1822
1823 err = ext3_mark_inode_dirty(handle, inode);
1824 if (!err)
1825 err = ext3_add_entry (handle, dentry, inode);
1826
1827 if (err) {
1828out_clear_inode:
1829 inode->i_nlink = 0;
1830 unlock_new_inode(inode);
1831 ext3_mark_inode_dirty(handle, inode);
1832 iput (inode);
1833 goto out_stop;
1834 }
1835 inc_nlink(dir);
1836 ext3_update_dx_flag(dir);
1837 err = ext3_mark_inode_dirty(handle, dir);
1838 if (err)
1839 goto out_clear_inode;
1840
1841 d_instantiate(dentry, inode);
1842 unlock_new_inode(inode);
1843out_stop:
1844 brelse(dir_block);
1845 ext3_journal_stop(handle);
1846 if (err == -ENOSPC && ext3_should_retry_alloc(dir->i_sb, &retries))
1847 goto retry;
1848 return err;
1849}
1850
1851
1852
1853
1854static int empty_dir (struct inode * inode)
1855{
1856 unsigned long offset;
1857 struct buffer_head * bh;
1858 struct ext3_dir_entry_2 * de, * de1;
1859 struct super_block * sb;
1860 int err = 0;
1861
1862 sb = inode->i_sb;
1863 if (inode->i_size < EXT3_DIR_REC_LEN(1) + EXT3_DIR_REC_LEN(2) ||
1864 !(bh = ext3_bread (NULL, inode, 0, 0, &err))) {
1865 if (err)
1866 ext3_error(inode->i_sb, __func__,
1867 "error %d reading directory #%lu offset 0",
1868 err, inode->i_ino);
1869 else
1870 ext3_warning(inode->i_sb, __func__,
1871 "bad directory (dir #%lu) - no data block",
1872 inode->i_ino);
1873 return 1;
1874 }
1875 de = (struct ext3_dir_entry_2 *) bh->b_data;
1876 de1 = ext3_next_entry(de);
1877 if (le32_to_cpu(de->inode) != inode->i_ino ||
1878 !le32_to_cpu(de1->inode) ||
1879 strcmp (".", de->name) ||
1880 strcmp ("..", de1->name)) {
1881 ext3_warning (inode->i_sb, "empty_dir",
1882 "bad directory (dir #%lu) - no `.' or `..'",
1883 inode->i_ino);
1884 brelse (bh);
1885 return 1;
1886 }
1887 offset = ext3_rec_len_from_disk(de->rec_len) +
1888 ext3_rec_len_from_disk(de1->rec_len);
1889 de = ext3_next_entry(de1);
1890 while (offset < inode->i_size ) {
1891 if (!bh ||
1892 (void *) de >= (void *) (bh->b_data+sb->s_blocksize)) {
1893 err = 0;
1894 brelse (bh);
1895 bh = ext3_bread (NULL, inode,
1896 offset >> EXT3_BLOCK_SIZE_BITS(sb), 0, &err);
1897 if (!bh) {
1898 if (err)
1899 ext3_error(sb, __func__,
1900 "error %d reading directory"
1901 " #%lu offset %lu",
1902 err, inode->i_ino, offset);
1903 offset += sb->s_blocksize;
1904 continue;
1905 }
1906 de = (struct ext3_dir_entry_2 *) bh->b_data;
1907 }
1908 if (!ext3_check_dir_entry("empty_dir", inode, de, bh, offset)) {
1909 de = (struct ext3_dir_entry_2 *)(bh->b_data +
1910 sb->s_blocksize);
1911 offset = (offset | (sb->s_blocksize - 1)) + 1;
1912 continue;
1913 }
1914 if (le32_to_cpu(de->inode)) {
1915 brelse (bh);
1916 return 0;
1917 }
1918 offset += ext3_rec_len_from_disk(de->rec_len);
1919 de = ext3_next_entry(de);
1920 }
1921 brelse (bh);
1922 return 1;
1923}
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933int ext3_orphan_add(handle_t *handle, struct inode *inode)
1934{
1935 struct super_block *sb = inode->i_sb;
1936 struct ext3_iloc iloc;
1937 int err = 0, rc;
1938
1939 mutex_lock(&EXT3_SB(sb)->s_orphan_lock);
1940 if (!list_empty(&EXT3_I(inode)->i_orphan))
1941 goto out_unlock;
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956 J_ASSERT ((S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1957 S_ISLNK(inode->i_mode)) || inode->i_nlink == 0);
1958
1959 BUFFER_TRACE(EXT3_SB(sb)->s_sbh, "get_write_access");
1960 err = ext3_journal_get_write_access(handle, EXT3_SB(sb)->s_sbh);
1961 if (err)
1962 goto out_unlock;
1963
1964 err = ext3_reserve_inode_write(handle, inode, &iloc);
1965 if (err)
1966 goto out_unlock;
1967
1968
1969 NEXT_ORPHAN(inode) = le32_to_cpu(EXT3_SB(sb)->s_es->s_last_orphan);
1970 EXT3_SB(sb)->s_es->s_last_orphan = cpu_to_le32(inode->i_ino);
1971 err = ext3_journal_dirty_metadata(handle, EXT3_SB(sb)->s_sbh);
1972 rc = ext3_mark_iloc_dirty(handle, inode, &iloc);
1973 if (!err)
1974 err = rc;
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984 if (!err)
1985 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1986
1987 jbd_debug(4, "superblock will point to %lu\n", inode->i_ino);
1988 jbd_debug(4, "orphan inode %lu will point to %d\n",
1989 inode->i_ino, NEXT_ORPHAN(inode));
1990out_unlock:
1991 mutex_unlock(&EXT3_SB(sb)->s_orphan_lock);
1992 ext3_std_error(inode->i_sb, err);
1993 return err;
1994}
1995
1996
1997
1998
1999
2000int ext3_orphan_del(handle_t *handle, struct inode *inode)
2001{
2002 struct list_head *prev;
2003 struct ext3_inode_info *ei = EXT3_I(inode);
2004 struct ext3_sb_info *sbi;
2005 unsigned long ino_next;
2006 struct ext3_iloc iloc;
2007 int err = 0;
2008
2009 mutex_lock(&EXT3_SB(inode->i_sb)->s_orphan_lock);
2010 if (list_empty(&ei->i_orphan))
2011 goto out;
2012
2013 ino_next = NEXT_ORPHAN(inode);
2014 prev = ei->i_orphan.prev;
2015 sbi = EXT3_SB(inode->i_sb);
2016
2017 jbd_debug(4, "remove inode %lu from orphan list\n", inode->i_ino);
2018
2019 list_del_init(&ei->i_orphan);
2020
2021
2022
2023
2024
2025 if (!handle)
2026 goto out;
2027
2028 err = ext3_reserve_inode_write(handle, inode, &iloc);
2029 if (err)
2030 goto out_err;
2031
2032 if (prev == &sbi->s_orphan) {
2033 jbd_debug(4, "superblock will point to %lu\n", ino_next);
2034 BUFFER_TRACE(sbi->s_sbh, "get_write_access");
2035 err = ext3_journal_get_write_access(handle, sbi->s_sbh);
2036 if (err)
2037 goto out_brelse;
2038 sbi->s_es->s_last_orphan = cpu_to_le32(ino_next);
2039 err = ext3_journal_dirty_metadata(handle, sbi->s_sbh);
2040 } else {
2041 struct ext3_iloc iloc2;
2042 struct inode *i_prev =
2043 &list_entry(prev, struct ext3_inode_info, i_orphan)->vfs_inode;
2044
2045 jbd_debug(4, "orphan inode %lu will point to %lu\n",
2046 i_prev->i_ino, ino_next);
2047 err = ext3_reserve_inode_write(handle, i_prev, &iloc2);
2048 if (err)
2049 goto out_brelse;
2050 NEXT_ORPHAN(i_prev) = ino_next;
2051 err = ext3_mark_iloc_dirty(handle, i_prev, &iloc2);
2052 }
2053 if (err)
2054 goto out_brelse;
2055 NEXT_ORPHAN(inode) = 0;
2056 err = ext3_mark_iloc_dirty(handle, inode, &iloc);
2057
2058out_err:
2059 ext3_std_error(inode->i_sb, err);
2060out:
2061 mutex_unlock(&EXT3_SB(inode->i_sb)->s_orphan_lock);
2062 return err;
2063
2064out_brelse:
2065 brelse(iloc.bh);
2066 goto out_err;
2067}
2068
2069static int ext3_rmdir (struct inode * dir, struct dentry *dentry)
2070{
2071 int retval;
2072 struct inode * inode;
2073 struct buffer_head * bh;
2074 struct ext3_dir_entry_2 * de;
2075 handle_t *handle;
2076
2077
2078
2079 dquot_initialize(dir);
2080 dquot_initialize(dentry->d_inode);
2081
2082 handle = ext3_journal_start(dir, EXT3_DELETE_TRANS_BLOCKS(dir->i_sb));
2083 if (IS_ERR(handle))
2084 return PTR_ERR(handle);
2085
2086 retval = -ENOENT;
2087 bh = ext3_find_entry(dir, &dentry->d_name, &de);
2088 if (!bh)
2089 goto end_rmdir;
2090
2091 if (IS_DIRSYNC(dir))
2092 handle->h_sync = 1;
2093
2094 inode = dentry->d_inode;
2095
2096 retval = -EIO;
2097 if (le32_to_cpu(de->inode) != inode->i_ino)
2098 goto end_rmdir;
2099
2100 retval = -ENOTEMPTY;
2101 if (!empty_dir (inode))
2102 goto end_rmdir;
2103
2104 retval = ext3_delete_entry(handle, dir, de, bh);
2105 if (retval)
2106 goto end_rmdir;
2107 if (inode->i_nlink != 2)
2108 ext3_warning (inode->i_sb, "ext3_rmdir",
2109 "empty directory has nlink!=2 (%d)",
2110 inode->i_nlink);
2111 inode->i_version++;
2112 clear_nlink(inode);
2113
2114
2115
2116 inode->i_size = 0;
2117 ext3_orphan_add(handle, inode);
2118 inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME_SEC;
2119 ext3_mark_inode_dirty(handle, inode);
2120 drop_nlink(dir);
2121 ext3_update_dx_flag(dir);
2122 ext3_mark_inode_dirty(handle, dir);
2123
2124end_rmdir:
2125 ext3_journal_stop(handle);
2126 brelse (bh);
2127 return retval;
2128}
2129
2130static int ext3_unlink(struct inode * dir, struct dentry *dentry)
2131{
2132 int retval;
2133 struct inode * inode;
2134 struct buffer_head * bh;
2135 struct ext3_dir_entry_2 * de;
2136 handle_t *handle;
2137
2138
2139
2140 dquot_initialize(dir);
2141 dquot_initialize(dentry->d_inode);
2142
2143 handle = ext3_journal_start(dir, EXT3_DELETE_TRANS_BLOCKS(dir->i_sb));
2144 if (IS_ERR(handle))
2145 return PTR_ERR(handle);
2146
2147 if (IS_DIRSYNC(dir))
2148 handle->h_sync = 1;
2149
2150 retval = -ENOENT;
2151 bh = ext3_find_entry(dir, &dentry->d_name, &de);
2152 if (!bh)
2153 goto end_unlink;
2154
2155 inode = dentry->d_inode;
2156
2157 retval = -EIO;
2158 if (le32_to_cpu(de->inode) != inode->i_ino)
2159 goto end_unlink;
2160
2161 if (!inode->i_nlink) {
2162 ext3_warning (inode->i_sb, "ext3_unlink",
2163 "Deleting nonexistent file (%lu), %d",
2164 inode->i_ino, inode->i_nlink);
2165 inode->i_nlink = 1;
2166 }
2167 retval = ext3_delete_entry(handle, dir, de, bh);
2168 if (retval)
2169 goto end_unlink;
2170 dir->i_ctime = dir->i_mtime = CURRENT_TIME_SEC;
2171 ext3_update_dx_flag(dir);
2172 ext3_mark_inode_dirty(handle, dir);
2173 drop_nlink(inode);
2174 if (!inode->i_nlink)
2175 ext3_orphan_add(handle, inode);
2176 inode->i_ctime = dir->i_ctime;
2177 ext3_mark_inode_dirty(handle, inode);
2178 retval = 0;
2179
2180end_unlink:
2181 ext3_journal_stop(handle);
2182 brelse (bh);
2183 return retval;
2184}
2185
2186static int ext3_symlink (struct inode * dir,
2187 struct dentry *dentry, const char * symname)
2188{
2189 handle_t *handle;
2190 struct inode * inode;
2191 int l, err, retries = 0;
2192
2193 l = strlen(symname)+1;
2194 if (l > dir->i_sb->s_blocksize)
2195 return -ENAMETOOLONG;
2196
2197 dquot_initialize(dir);
2198
2199retry:
2200 handle = ext3_journal_start(dir, EXT3_DATA_TRANS_BLOCKS(dir->i_sb) +
2201 EXT3_INDEX_EXTRA_TRANS_BLOCKS + 5 +
2202 EXT3_MAXQUOTAS_INIT_BLOCKS(dir->i_sb));
2203 if (IS_ERR(handle))
2204 return PTR_ERR(handle);
2205
2206 if (IS_DIRSYNC(dir))
2207 handle->h_sync = 1;
2208
2209 inode = ext3_new_inode (handle, dir, S_IFLNK|S_IRWXUGO);
2210 err = PTR_ERR(inode);
2211 if (IS_ERR(inode))
2212 goto out_stop;
2213
2214 if (l > sizeof (EXT3_I(inode)->i_data)) {
2215 inode->i_op = &ext3_symlink_inode_operations;
2216 ext3_set_aops(inode);
2217
2218
2219
2220
2221
2222 err = __page_symlink(inode, symname, l, 1);
2223 if (err) {
2224 drop_nlink(inode);
2225 unlock_new_inode(inode);
2226 ext3_mark_inode_dirty(handle, inode);
2227 iput (inode);
2228 goto out_stop;
2229 }
2230 } else {
2231 inode->i_op = &ext3_fast_symlink_inode_operations;
2232 memcpy((char*)&EXT3_I(inode)->i_data,symname,l);
2233 inode->i_size = l-1;
2234 }
2235 EXT3_I(inode)->i_disksize = inode->i_size;
2236 err = ext3_add_nondir(handle, dentry, inode);
2237out_stop:
2238 ext3_journal_stop(handle);
2239 if (err == -ENOSPC && ext3_should_retry_alloc(dir->i_sb, &retries))
2240 goto retry;
2241 return err;
2242}
2243
2244static int ext3_link (struct dentry * old_dentry,
2245 struct inode * dir, struct dentry *dentry)
2246{
2247 handle_t *handle;
2248 struct inode *inode = old_dentry->d_inode;
2249 int err, retries = 0;
2250
2251 if (inode->i_nlink >= EXT3_LINK_MAX)
2252 return -EMLINK;
2253
2254 dquot_initialize(dir);
2255
2256
2257
2258
2259
2260 if (inode->i_nlink == 0)
2261 return -ENOENT;
2262
2263retry:
2264 handle = ext3_journal_start(dir, EXT3_DATA_TRANS_BLOCKS(dir->i_sb) +
2265 EXT3_INDEX_EXTRA_TRANS_BLOCKS);
2266 if (IS_ERR(handle))
2267 return PTR_ERR(handle);
2268
2269 if (IS_DIRSYNC(dir))
2270 handle->h_sync = 1;
2271
2272 inode->i_ctime = CURRENT_TIME_SEC;
2273 inc_nlink(inode);
2274 ihold(inode);
2275
2276 err = ext3_add_entry(handle, dentry, inode);
2277 if (!err) {
2278 ext3_mark_inode_dirty(handle, inode);
2279 d_instantiate(dentry, inode);
2280 } else {
2281 drop_nlink(inode);
2282 iput(inode);
2283 }
2284 ext3_journal_stop(handle);
2285 if (err == -ENOSPC && ext3_should_retry_alloc(dir->i_sb, &retries))
2286 goto retry;
2287 return err;
2288}
2289
2290#define PARENT_INO(buffer) \
2291 (ext3_next_entry((struct ext3_dir_entry_2 *)(buffer))->inode)
2292
2293
2294
2295
2296
2297static int ext3_rename (struct inode * old_dir, struct dentry *old_dentry,
2298 struct inode * new_dir,struct dentry *new_dentry)
2299{
2300 handle_t *handle;
2301 struct inode * old_inode, * new_inode;
2302 struct buffer_head * old_bh, * new_bh, * dir_bh;
2303 struct ext3_dir_entry_2 * old_de, * new_de;
2304 int retval, flush_file = 0;
2305
2306 dquot_initialize(old_dir);
2307 dquot_initialize(new_dir);
2308
2309 old_bh = new_bh = dir_bh = NULL;
2310
2311
2312
2313 if (new_dentry->d_inode)
2314 dquot_initialize(new_dentry->d_inode);
2315 handle = ext3_journal_start(old_dir, 2 *
2316 EXT3_DATA_TRANS_BLOCKS(old_dir->i_sb) +
2317 EXT3_INDEX_EXTRA_TRANS_BLOCKS + 2);
2318 if (IS_ERR(handle))
2319 return PTR_ERR(handle);
2320
2321 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
2322 handle->h_sync = 1;
2323
2324 old_bh = ext3_find_entry(old_dir, &old_dentry->d_name, &old_de);
2325
2326
2327
2328
2329
2330
2331 old_inode = old_dentry->d_inode;
2332 retval = -ENOENT;
2333 if (!old_bh || le32_to_cpu(old_de->inode) != old_inode->i_ino)
2334 goto end_rename;
2335
2336 new_inode = new_dentry->d_inode;
2337 new_bh = ext3_find_entry(new_dir, &new_dentry->d_name, &new_de);
2338 if (new_bh) {
2339 if (!new_inode) {
2340 brelse (new_bh);
2341 new_bh = NULL;
2342 }
2343 }
2344 if (S_ISDIR(old_inode->i_mode)) {
2345 if (new_inode) {
2346 retval = -ENOTEMPTY;
2347 if (!empty_dir (new_inode))
2348 goto end_rename;
2349 }
2350 retval = -EIO;
2351 dir_bh = ext3_bread (handle, old_inode, 0, 0, &retval);
2352 if (!dir_bh)
2353 goto end_rename;
2354 if (le32_to_cpu(PARENT_INO(dir_bh->b_data)) != old_dir->i_ino)
2355 goto end_rename;
2356 retval = -EMLINK;
2357 if (!new_inode && new_dir!=old_dir &&
2358 new_dir->i_nlink >= EXT3_LINK_MAX)
2359 goto end_rename;
2360 }
2361 if (!new_bh) {
2362 retval = ext3_add_entry (handle, new_dentry, old_inode);
2363 if (retval)
2364 goto end_rename;
2365 } else {
2366 BUFFER_TRACE(new_bh, "get write access");
2367 retval = ext3_journal_get_write_access(handle, new_bh);
2368 if (retval)
2369 goto journal_error;
2370 new_de->inode = cpu_to_le32(old_inode->i_ino);
2371 if (EXT3_HAS_INCOMPAT_FEATURE(new_dir->i_sb,
2372 EXT3_FEATURE_INCOMPAT_FILETYPE))
2373 new_de->file_type = old_de->file_type;
2374 new_dir->i_version++;
2375 new_dir->i_ctime = new_dir->i_mtime = CURRENT_TIME_SEC;
2376 ext3_mark_inode_dirty(handle, new_dir);
2377 BUFFER_TRACE(new_bh, "call ext3_journal_dirty_metadata");
2378 retval = ext3_journal_dirty_metadata(handle, new_bh);
2379 if (retval)
2380 goto journal_error;
2381 brelse(new_bh);
2382 new_bh = NULL;
2383 }
2384
2385
2386
2387
2388
2389 old_inode->i_ctime = CURRENT_TIME_SEC;
2390 ext3_mark_inode_dirty(handle, old_inode);
2391
2392
2393
2394
2395 if (le32_to_cpu(old_de->inode) != old_inode->i_ino ||
2396 old_de->name_len != old_dentry->d_name.len ||
2397 strncmp(old_de->name, old_dentry->d_name.name, old_de->name_len) ||
2398 (retval = ext3_delete_entry(handle, old_dir,
2399 old_de, old_bh)) == -ENOENT) {
2400
2401
2402
2403
2404 struct buffer_head *old_bh2;
2405 struct ext3_dir_entry_2 *old_de2;
2406
2407 old_bh2 = ext3_find_entry(old_dir, &old_dentry->d_name,
2408 &old_de2);
2409 if (old_bh2) {
2410 retval = ext3_delete_entry(handle, old_dir,
2411 old_de2, old_bh2);
2412 brelse(old_bh2);
2413 }
2414 }
2415 if (retval) {
2416 ext3_warning(old_dir->i_sb, "ext3_rename",
2417 "Deleting old file (%lu), %d, error=%d",
2418 old_dir->i_ino, old_dir->i_nlink, retval);
2419 }
2420
2421 if (new_inode) {
2422 drop_nlink(new_inode);
2423 new_inode->i_ctime = CURRENT_TIME_SEC;
2424 }
2425 old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME_SEC;
2426 ext3_update_dx_flag(old_dir);
2427 if (dir_bh) {
2428 BUFFER_TRACE(dir_bh, "get_write_access");
2429 retval = ext3_journal_get_write_access(handle, dir_bh);
2430 if (retval)
2431 goto journal_error;
2432 PARENT_INO(dir_bh->b_data) = cpu_to_le32(new_dir->i_ino);
2433 BUFFER_TRACE(dir_bh, "call ext3_journal_dirty_metadata");
2434 retval = ext3_journal_dirty_metadata(handle, dir_bh);
2435 if (retval) {
2436journal_error:
2437 ext3_std_error(new_dir->i_sb, retval);
2438 goto end_rename;
2439 }
2440 drop_nlink(old_dir);
2441 if (new_inode) {
2442 drop_nlink(new_inode);
2443 } else {
2444 inc_nlink(new_dir);
2445 ext3_update_dx_flag(new_dir);
2446 ext3_mark_inode_dirty(handle, new_dir);
2447 }
2448 }
2449 ext3_mark_inode_dirty(handle, old_dir);
2450 if (new_inode) {
2451 ext3_mark_inode_dirty(handle, new_inode);
2452 if (!new_inode->i_nlink)
2453 ext3_orphan_add(handle, new_inode);
2454 if (ext3_should_writeback_data(new_inode))
2455 flush_file = 1;
2456 }
2457 retval = 0;
2458
2459end_rename:
2460 brelse (dir_bh);
2461 brelse (old_bh);
2462 brelse (new_bh);
2463 ext3_journal_stop(handle);
2464 if (retval == 0 && flush_file)
2465 filemap_flush(old_inode->i_mapping);
2466 return retval;
2467}
2468
2469
2470
2471
2472const struct inode_operations ext3_dir_inode_operations = {
2473 .create = ext3_create,
2474 .lookup = ext3_lookup,
2475 .link = ext3_link,
2476 .unlink = ext3_unlink,
2477 .symlink = ext3_symlink,
2478 .mkdir = ext3_mkdir,
2479 .rmdir = ext3_rmdir,
2480 .mknod = ext3_mknod,
2481 .rename = ext3_rename,
2482 .setattr = ext3_setattr,
2483#ifdef CONFIG_EXT3_FS_XATTR
2484 .setxattr = generic_setxattr,
2485 .getxattr = generic_getxattr,
2486 .listxattr = ext3_listxattr,
2487 .removexattr = generic_removexattr,
2488#endif
2489 .check_acl = ext3_check_acl,
2490};
2491
2492const struct inode_operations ext3_special_inode_operations = {
2493 .setattr = ext3_setattr,
2494#ifdef CONFIG_EXT3_FS_XATTR
2495 .setxattr = generic_setxattr,
2496 .getxattr = generic_getxattr,
2497 .listxattr = ext3_listxattr,
2498 .removexattr = generic_removexattr,
2499#endif
2500 .check_acl = ext3_check_acl,
2501};
2502