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28#include <linux/fs.h>
29#include <linux/pagemap.h>
30#include <linux/time.h>
31#include <linux/fcntl.h>
32#include <linux/stat.h>
33#include <linux/string.h>
34#include <linux/quotaops.h>
35#include <linux/buffer_head.h>
36#include <linux/bio.h>
37#include <linux/iversion.h>
38#include <linux/unicode.h>
39#include "ext4.h"
40#include "ext4_jbd2.h"
41
42#include "xattr.h"
43#include "acl.h"
44
45#include <trace/events/ext4.h>
46
47
48
49#define NAMEI_RA_CHUNKS 2
50#define NAMEI_RA_BLOCKS 4
51#define NAMEI_RA_SIZE (NAMEI_RA_CHUNKS * NAMEI_RA_BLOCKS)
52
53static struct buffer_head *ext4_append(handle_t *handle,
54 struct inode *inode,
55 ext4_lblk_t *block)
56{
57 struct buffer_head *bh;
58 int err;
59
60 if (unlikely(EXT4_SB(inode->i_sb)->s_max_dir_size_kb &&
61 ((inode->i_size >> 10) >=
62 EXT4_SB(inode->i_sb)->s_max_dir_size_kb)))
63 return ERR_PTR(-ENOSPC);
64
65 *block = inode->i_size >> inode->i_sb->s_blocksize_bits;
66
67 bh = ext4_bread(handle, inode, *block, EXT4_GET_BLOCKS_CREATE);
68 if (IS_ERR(bh))
69 return bh;
70 inode->i_size += inode->i_sb->s_blocksize;
71 EXT4_I(inode)->i_disksize = inode->i_size;
72 BUFFER_TRACE(bh, "get_write_access");
73 err = ext4_journal_get_write_access(handle, bh);
74 if (err) {
75 brelse(bh);
76 ext4_std_error(inode->i_sb, err);
77 return ERR_PTR(err);
78 }
79 return bh;
80}
81
82static int ext4_dx_csum_verify(struct inode *inode,
83 struct ext4_dir_entry *dirent);
84
85
86
87
88
89
90
91
92
93
94
95typedef enum {
96 EITHER, INDEX, DIRENT, DIRENT_HTREE
97} dirblock_type_t;
98
99#define ext4_read_dirblock(inode, block, type) \
100 __ext4_read_dirblock((inode), (block), (type), __func__, __LINE__)
101
102static struct buffer_head *__ext4_read_dirblock(struct inode *inode,
103 ext4_lblk_t block,
104 dirblock_type_t type,
105 const char *func,
106 unsigned int line)
107{
108 struct buffer_head *bh;
109 struct ext4_dir_entry *dirent;
110 int is_dx_block = 0;
111
112 bh = ext4_bread(NULL, inode, block, 0);
113 if (IS_ERR(bh)) {
114 __ext4_warning(inode->i_sb, func, line,
115 "inode #%lu: lblock %lu: comm %s: "
116 "error %ld reading directory block",
117 inode->i_ino, (unsigned long)block,
118 current->comm, PTR_ERR(bh));
119
120 return bh;
121 }
122 if (!bh && (type == INDEX || type == DIRENT_HTREE)) {
123 ext4_error_inode(inode, func, line, block,
124 "Directory hole found for htree %s block",
125 (type == INDEX) ? "index" : "leaf");
126 return ERR_PTR(-EFSCORRUPTED);
127 }
128 if (!bh)
129 return NULL;
130 dirent = (struct ext4_dir_entry *) bh->b_data;
131
132 if (is_dx(inode)) {
133 if (block == 0)
134 is_dx_block = 1;
135 else if (ext4_rec_len_from_disk(dirent->rec_len,
136 inode->i_sb->s_blocksize) ==
137 inode->i_sb->s_blocksize)
138 is_dx_block = 1;
139 }
140 if (!is_dx_block && type == INDEX) {
141 ext4_error_inode(inode, func, line, block,
142 "directory leaf block found instead of index block");
143 brelse(bh);
144 return ERR_PTR(-EFSCORRUPTED);
145 }
146 if (!ext4_has_metadata_csum(inode->i_sb) ||
147 buffer_verified(bh))
148 return bh;
149
150
151
152
153
154
155 if (is_dx_block && type == INDEX) {
156 if (ext4_dx_csum_verify(inode, dirent))
157 set_buffer_verified(bh);
158 else {
159 ext4_error_inode(inode, func, line, block,
160 "Directory index failed checksum");
161 brelse(bh);
162 return ERR_PTR(-EFSBADCRC);
163 }
164 }
165 if (!is_dx_block) {
166 if (ext4_dirblock_csum_verify(inode, bh))
167 set_buffer_verified(bh);
168 else {
169 ext4_error_inode(inode, func, line, block,
170 "Directory block failed checksum");
171 brelse(bh);
172 return ERR_PTR(-EFSBADCRC);
173 }
174 }
175 return bh;
176}
177
178#ifndef assert
179#define assert(test) J_ASSERT(test)
180#endif
181
182#ifdef DX_DEBUG
183#define dxtrace(command) command
184#else
185#define dxtrace(command)
186#endif
187
188struct fake_dirent
189{
190 __le32 inode;
191 __le16 rec_len;
192 u8 name_len;
193 u8 file_type;
194};
195
196struct dx_countlimit
197{
198 __le16 limit;
199 __le16 count;
200};
201
202struct dx_entry
203{
204 __le32 hash;
205 __le32 block;
206};
207
208
209
210
211
212
213
214struct dx_root
215{
216 struct fake_dirent dot;
217 char dot_name[4];
218 struct fake_dirent dotdot;
219 char dotdot_name[4];
220 struct dx_root_info
221 {
222 __le32 reserved_zero;
223 u8 hash_version;
224 u8 info_length;
225 u8 indirect_levels;
226 u8 unused_flags;
227 }
228 info;
229 struct dx_entry entries[0];
230};
231
232struct dx_node
233{
234 struct fake_dirent fake;
235 struct dx_entry entries[0];
236};
237
238
239struct dx_frame
240{
241 struct buffer_head *bh;
242 struct dx_entry *entries;
243 struct dx_entry *at;
244};
245
246struct dx_map_entry
247{
248 u32 hash;
249 u16 offs;
250 u16 size;
251};
252
253
254
255
256struct dx_tail {
257 u32 dt_reserved;
258 __le32 dt_checksum;
259};
260
261static inline ext4_lblk_t dx_get_block(struct dx_entry *entry);
262static void dx_set_block(struct dx_entry *entry, ext4_lblk_t value);
263static inline unsigned dx_get_hash(struct dx_entry *entry);
264static void dx_set_hash(struct dx_entry *entry, unsigned value);
265static unsigned dx_get_count(struct dx_entry *entries);
266static unsigned dx_get_limit(struct dx_entry *entries);
267static void dx_set_count(struct dx_entry *entries, unsigned value);
268static void dx_set_limit(struct dx_entry *entries, unsigned value);
269static unsigned dx_root_limit(struct inode *dir, unsigned infosize);
270static unsigned dx_node_limit(struct inode *dir);
271static struct dx_frame *dx_probe(struct ext4_filename *fname,
272 struct inode *dir,
273 struct dx_hash_info *hinfo,
274 struct dx_frame *frame);
275static void dx_release(struct dx_frame *frames);
276static int dx_make_map(struct inode *dir, struct ext4_dir_entry_2 *de,
277 unsigned blocksize, struct dx_hash_info *hinfo,
278 struct dx_map_entry map[]);
279static void dx_sort_map(struct dx_map_entry *map, unsigned count);
280static struct ext4_dir_entry_2 *dx_move_dirents(char *from, char *to,
281 struct dx_map_entry *offsets, int count, unsigned blocksize);
282static struct ext4_dir_entry_2* dx_pack_dirents(char *base, unsigned blocksize);
283static void dx_insert_block(struct dx_frame *frame,
284 u32 hash, ext4_lblk_t block);
285static int ext4_htree_next_block(struct inode *dir, __u32 hash,
286 struct dx_frame *frame,
287 struct dx_frame *frames,
288 __u32 *start_hash);
289static struct buffer_head * ext4_dx_find_entry(struct inode *dir,
290 struct ext4_filename *fname,
291 struct ext4_dir_entry_2 **res_dir);
292static int ext4_dx_add_entry(handle_t *handle, struct ext4_filename *fname,
293 struct inode *dir, struct inode *inode);
294
295
296void ext4_initialize_dirent_tail(struct buffer_head *bh,
297 unsigned int blocksize)
298{
299 struct ext4_dir_entry_tail *t = EXT4_DIRENT_TAIL(bh->b_data, blocksize);
300
301 memset(t, 0, sizeof(struct ext4_dir_entry_tail));
302 t->det_rec_len = ext4_rec_len_to_disk(
303 sizeof(struct ext4_dir_entry_tail), blocksize);
304 t->det_reserved_ft = EXT4_FT_DIR_CSUM;
305}
306
307
308static struct ext4_dir_entry_tail *get_dirent_tail(struct inode *inode,
309 struct buffer_head *bh)
310{
311 struct ext4_dir_entry_tail *t;
312
313#ifdef PARANOID
314 struct ext4_dir_entry *d, *top;
315
316 d = (struct ext4_dir_entry *)bh->b_data;
317 top = (struct ext4_dir_entry *)(bh->b_data +
318 (EXT4_BLOCK_SIZE(inode->i_sb) -
319 sizeof(struct ext4_dir_entry_tail)));
320 while (d < top && d->rec_len)
321 d = (struct ext4_dir_entry *)(((void *)d) +
322 le16_to_cpu(d->rec_len));
323
324 if (d != top)
325 return NULL;
326
327 t = (struct ext4_dir_entry_tail *)d;
328#else
329 t = EXT4_DIRENT_TAIL(bh->b_data, EXT4_BLOCK_SIZE(inode->i_sb));
330#endif
331
332 if (t->det_reserved_zero1 ||
333 le16_to_cpu(t->det_rec_len) != sizeof(struct ext4_dir_entry_tail) ||
334 t->det_reserved_zero2 ||
335 t->det_reserved_ft != EXT4_FT_DIR_CSUM)
336 return NULL;
337
338 return t;
339}
340
341static __le32 ext4_dirblock_csum(struct inode *inode, void *dirent, int size)
342{
343 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
344 struct ext4_inode_info *ei = EXT4_I(inode);
345 __u32 csum;
346
347 csum = ext4_chksum(sbi, ei->i_csum_seed, (__u8 *)dirent, size);
348 return cpu_to_le32(csum);
349}
350
351#define warn_no_space_for_csum(inode) \
352 __warn_no_space_for_csum((inode), __func__, __LINE__)
353
354static void __warn_no_space_for_csum(struct inode *inode, const char *func,
355 unsigned int line)
356{
357 __ext4_warning_inode(inode, func, line,
358 "No space for directory leaf checksum. Please run e2fsck -D.");
359}
360
361int ext4_dirblock_csum_verify(struct inode *inode, struct buffer_head *bh)
362{
363 struct ext4_dir_entry_tail *t;
364
365 if (!ext4_has_metadata_csum(inode->i_sb))
366 return 1;
367
368 t = get_dirent_tail(inode, bh);
369 if (!t) {
370 warn_no_space_for_csum(inode);
371 return 0;
372 }
373
374 if (t->det_checksum != ext4_dirblock_csum(inode, bh->b_data,
375 (char *)t - bh->b_data))
376 return 0;
377
378 return 1;
379}
380
381static void ext4_dirblock_csum_set(struct inode *inode,
382 struct buffer_head *bh)
383{
384 struct ext4_dir_entry_tail *t;
385
386 if (!ext4_has_metadata_csum(inode->i_sb))
387 return;
388
389 t = get_dirent_tail(inode, bh);
390 if (!t) {
391 warn_no_space_for_csum(inode);
392 return;
393 }
394
395 t->det_checksum = ext4_dirblock_csum(inode, bh->b_data,
396 (char *)t - bh->b_data);
397}
398
399int ext4_handle_dirty_dirblock(handle_t *handle,
400 struct inode *inode,
401 struct buffer_head *bh)
402{
403 ext4_dirblock_csum_set(inode, bh);
404 return ext4_handle_dirty_metadata(handle, inode, bh);
405}
406
407static struct dx_countlimit *get_dx_countlimit(struct inode *inode,
408 struct ext4_dir_entry *dirent,
409 int *offset)
410{
411 struct ext4_dir_entry *dp;
412 struct dx_root_info *root;
413 int count_offset;
414
415 if (le16_to_cpu(dirent->rec_len) == EXT4_BLOCK_SIZE(inode->i_sb))
416 count_offset = 8;
417 else if (le16_to_cpu(dirent->rec_len) == 12) {
418 dp = (struct ext4_dir_entry *)(((void *)dirent) + 12);
419 if (le16_to_cpu(dp->rec_len) !=
420 EXT4_BLOCK_SIZE(inode->i_sb) - 12)
421 return NULL;
422 root = (struct dx_root_info *)(((void *)dp + 12));
423 if (root->reserved_zero ||
424 root->info_length != sizeof(struct dx_root_info))
425 return NULL;
426 count_offset = 32;
427 } else
428 return NULL;
429
430 if (offset)
431 *offset = count_offset;
432 return (struct dx_countlimit *)(((void *)dirent) + count_offset);
433}
434
435static __le32 ext4_dx_csum(struct inode *inode, struct ext4_dir_entry *dirent,
436 int count_offset, int count, struct dx_tail *t)
437{
438 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
439 struct ext4_inode_info *ei = EXT4_I(inode);
440 __u32 csum;
441 int size;
442 __u32 dummy_csum = 0;
443 int offset = offsetof(struct dx_tail, dt_checksum);
444
445 size = count_offset + (count * sizeof(struct dx_entry));
446 csum = ext4_chksum(sbi, ei->i_csum_seed, (__u8 *)dirent, size);
447 csum = ext4_chksum(sbi, csum, (__u8 *)t, offset);
448 csum = ext4_chksum(sbi, csum, (__u8 *)&dummy_csum, sizeof(dummy_csum));
449
450 return cpu_to_le32(csum);
451}
452
453static int ext4_dx_csum_verify(struct inode *inode,
454 struct ext4_dir_entry *dirent)
455{
456 struct dx_countlimit *c;
457 struct dx_tail *t;
458 int count_offset, limit, count;
459
460 if (!ext4_has_metadata_csum(inode->i_sb))
461 return 1;
462
463 c = get_dx_countlimit(inode, dirent, &count_offset);
464 if (!c) {
465 EXT4_ERROR_INODE(inode, "dir seems corrupt? Run e2fsck -D.");
466 return 0;
467 }
468 limit = le16_to_cpu(c->limit);
469 count = le16_to_cpu(c->count);
470 if (count_offset + (limit * sizeof(struct dx_entry)) >
471 EXT4_BLOCK_SIZE(inode->i_sb) - sizeof(struct dx_tail)) {
472 warn_no_space_for_csum(inode);
473 return 0;
474 }
475 t = (struct dx_tail *)(((struct dx_entry *)c) + limit);
476
477 if (t->dt_checksum != ext4_dx_csum(inode, dirent, count_offset,
478 count, t))
479 return 0;
480 return 1;
481}
482
483static void ext4_dx_csum_set(struct inode *inode, struct ext4_dir_entry *dirent)
484{
485 struct dx_countlimit *c;
486 struct dx_tail *t;
487 int count_offset, limit, count;
488
489 if (!ext4_has_metadata_csum(inode->i_sb))
490 return;
491
492 c = get_dx_countlimit(inode, dirent, &count_offset);
493 if (!c) {
494 EXT4_ERROR_INODE(inode, "dir seems corrupt? Run e2fsck -D.");
495 return;
496 }
497 limit = le16_to_cpu(c->limit);
498 count = le16_to_cpu(c->count);
499 if (count_offset + (limit * sizeof(struct dx_entry)) >
500 EXT4_BLOCK_SIZE(inode->i_sb) - sizeof(struct dx_tail)) {
501 warn_no_space_for_csum(inode);
502 return;
503 }
504 t = (struct dx_tail *)(((struct dx_entry *)c) + limit);
505
506 t->dt_checksum = ext4_dx_csum(inode, dirent, count_offset, count, t);
507}
508
509static inline int ext4_handle_dirty_dx_node(handle_t *handle,
510 struct inode *inode,
511 struct buffer_head *bh)
512{
513 ext4_dx_csum_set(inode, (struct ext4_dir_entry *)bh->b_data);
514 return ext4_handle_dirty_metadata(handle, inode, bh);
515}
516
517
518
519
520static inline struct ext4_dir_entry_2 *
521ext4_next_entry(struct ext4_dir_entry_2 *p, unsigned long blocksize)
522{
523 return (struct ext4_dir_entry_2 *)((char *)p +
524 ext4_rec_len_from_disk(p->rec_len, blocksize));
525}
526
527
528
529
530
531
532static inline ext4_lblk_t dx_get_block(struct dx_entry *entry)
533{
534 return le32_to_cpu(entry->block) & 0x0fffffff;
535}
536
537static inline void dx_set_block(struct dx_entry *entry, ext4_lblk_t value)
538{
539 entry->block = cpu_to_le32(value);
540}
541
542static inline unsigned dx_get_hash(struct dx_entry *entry)
543{
544 return le32_to_cpu(entry->hash);
545}
546
547static inline void dx_set_hash(struct dx_entry *entry, unsigned value)
548{
549 entry->hash = cpu_to_le32(value);
550}
551
552static inline unsigned dx_get_count(struct dx_entry *entries)
553{
554 return le16_to_cpu(((struct dx_countlimit *) entries)->count);
555}
556
557static inline unsigned dx_get_limit(struct dx_entry *entries)
558{
559 return le16_to_cpu(((struct dx_countlimit *) entries)->limit);
560}
561
562static inline void dx_set_count(struct dx_entry *entries, unsigned value)
563{
564 ((struct dx_countlimit *) entries)->count = cpu_to_le16(value);
565}
566
567static inline void dx_set_limit(struct dx_entry *entries, unsigned value)
568{
569 ((struct dx_countlimit *) entries)->limit = cpu_to_le16(value);
570}
571
572static inline unsigned dx_root_limit(struct inode *dir, unsigned infosize)
573{
574 unsigned entry_space = dir->i_sb->s_blocksize - EXT4_DIR_REC_LEN(1) -
575 EXT4_DIR_REC_LEN(2) - infosize;
576
577 if (ext4_has_metadata_csum(dir->i_sb))
578 entry_space -= sizeof(struct dx_tail);
579 return entry_space / sizeof(struct dx_entry);
580}
581
582static inline unsigned dx_node_limit(struct inode *dir)
583{
584 unsigned entry_space = dir->i_sb->s_blocksize - EXT4_DIR_REC_LEN(0);
585
586 if (ext4_has_metadata_csum(dir->i_sb))
587 entry_space -= sizeof(struct dx_tail);
588 return entry_space / sizeof(struct dx_entry);
589}
590
591
592
593
594#ifdef DX_DEBUG
595static void dx_show_index(char * label, struct dx_entry *entries)
596{
597 int i, n = dx_get_count (entries);
598 printk(KERN_DEBUG "%s index", label);
599 for (i = 0; i < n; i++) {
600 printk(KERN_CONT " %x->%lu",
601 i ? dx_get_hash(entries + i) : 0,
602 (unsigned long)dx_get_block(entries + i));
603 }
604 printk(KERN_CONT "\n");
605}
606
607struct stats
608{
609 unsigned names;
610 unsigned space;
611 unsigned bcount;
612};
613
614static struct stats dx_show_leaf(struct inode *dir,
615 struct dx_hash_info *hinfo,
616 struct ext4_dir_entry_2 *de,
617 int size, int show_names)
618{
619 unsigned names = 0, space = 0;
620 char *base = (char *) de;
621 struct dx_hash_info h = *hinfo;
622
623 printk("names: ");
624 while ((char *) de < base + size)
625 {
626 if (de->inode)
627 {
628 if (show_names)
629 {
630#ifdef CONFIG_FS_ENCRYPTION
631 int len;
632 char *name;
633 struct fscrypt_str fname_crypto_str =
634 FSTR_INIT(NULL, 0);
635 int res = 0;
636
637 name = de->name;
638 len = de->name_len;
639 if (IS_ENCRYPTED(dir))
640 res = fscrypt_get_encryption_info(dir);
641 if (res) {
642 printk(KERN_WARNING "Error setting up"
643 " fname crypto: %d\n", res);
644 }
645 if (!fscrypt_has_encryption_key(dir)) {
646
647 ext4fs_dirhash(dir, de->name,
648 de->name_len, &h);
649 printk("%*.s:(U)%x.%u ", len,
650 name, h.hash,
651 (unsigned) ((char *) de
652 - base));
653 } else {
654 struct fscrypt_str de_name =
655 FSTR_INIT(name, len);
656
657
658 res = fscrypt_fname_alloc_buffer(
659 dir, len,
660 &fname_crypto_str);
661 if (res)
662 printk(KERN_WARNING "Error "
663 "allocating crypto "
664 "buffer--skipping "
665 "crypto\n");
666 res = fscrypt_fname_disk_to_usr(dir,
667 0, 0, &de_name,
668 &fname_crypto_str);
669 if (res) {
670 printk(KERN_WARNING "Error "
671 "converting filename "
672 "from disk to usr"
673 "\n");
674 name = "??";
675 len = 2;
676 } else {
677 name = fname_crypto_str.name;
678 len = fname_crypto_str.len;
679 }
680 ext4fs_dirhash(dir, de->name,
681 de->name_len, &h);
682 printk("%*.s:(E)%x.%u ", len, name,
683 h.hash, (unsigned) ((char *) de
684 - base));
685 fscrypt_fname_free_buffer(
686 &fname_crypto_str);
687 }
688#else
689 int len = de->name_len;
690 char *name = de->name;
691 ext4fs_dirhash(dir, de->name, de->name_len, &h);
692 printk("%*.s:%x.%u ", len, name, h.hash,
693 (unsigned) ((char *) de - base));
694#endif
695 }
696 space += EXT4_DIR_REC_LEN(de->name_len);
697 names++;
698 }
699 de = ext4_next_entry(de, size);
700 }
701 printk(KERN_CONT "(%i)\n", names);
702 return (struct stats) { names, space, 1 };
703}
704
705struct stats dx_show_entries(struct dx_hash_info *hinfo, struct inode *dir,
706 struct dx_entry *entries, int levels)
707{
708 unsigned blocksize = dir->i_sb->s_blocksize;
709 unsigned count = dx_get_count(entries), names = 0, space = 0, i;
710 unsigned bcount = 0;
711 struct buffer_head *bh;
712 printk("%i indexed blocks...\n", count);
713 for (i = 0; i < count; i++, entries++)
714 {
715 ext4_lblk_t block = dx_get_block(entries);
716 ext4_lblk_t hash = i ? dx_get_hash(entries): 0;
717 u32 range = i < count - 1? (dx_get_hash(entries + 1) - hash): ~hash;
718 struct stats stats;
719 printk("%s%3u:%03u hash %8x/%8x ",levels?"":" ", i, block, hash, range);
720 bh = ext4_bread(NULL,dir, block, 0);
721 if (!bh || IS_ERR(bh))
722 continue;
723 stats = levels?
724 dx_show_entries(hinfo, dir, ((struct dx_node *) bh->b_data)->entries, levels - 1):
725 dx_show_leaf(dir, hinfo, (struct ext4_dir_entry_2 *)
726 bh->b_data, blocksize, 0);
727 names += stats.names;
728 space += stats.space;
729 bcount += stats.bcount;
730 brelse(bh);
731 }
732 if (bcount)
733 printk(KERN_DEBUG "%snames %u, fullness %u (%u%%)\n",
734 levels ? "" : " ", names, space/bcount,
735 (space/bcount)*100/blocksize);
736 return (struct stats) { names, space, bcount};
737}
738#endif
739
740
741
742
743
744
745
746
747
748
749static struct dx_frame *
750dx_probe(struct ext4_filename *fname, struct inode *dir,
751 struct dx_hash_info *hinfo, struct dx_frame *frame_in)
752{
753 unsigned count, indirect;
754 struct dx_entry *at, *entries, *p, *q, *m;
755 struct dx_root *root;
756 struct dx_frame *frame = frame_in;
757 struct dx_frame *ret_err = ERR_PTR(ERR_BAD_DX_DIR);
758 u32 hash;
759
760 memset(frame_in, 0, EXT4_HTREE_LEVEL * sizeof(frame_in[0]));
761 frame->bh = ext4_read_dirblock(dir, 0, INDEX);
762 if (IS_ERR(frame->bh))
763 return (struct dx_frame *) frame->bh;
764
765 root = (struct dx_root *) frame->bh->b_data;
766 if (root->info.hash_version != DX_HASH_TEA &&
767 root->info.hash_version != DX_HASH_HALF_MD4 &&
768 root->info.hash_version != DX_HASH_LEGACY) {
769 ext4_warning_inode(dir, "Unrecognised inode hash code %u",
770 root->info.hash_version);
771 goto fail;
772 }
773 if (fname)
774 hinfo = &fname->hinfo;
775 hinfo->hash_version = root->info.hash_version;
776 if (hinfo->hash_version <= DX_HASH_TEA)
777 hinfo->hash_version += EXT4_SB(dir->i_sb)->s_hash_unsigned;
778 hinfo->seed = EXT4_SB(dir->i_sb)->s_hash_seed;
779 if (fname && fname_name(fname))
780 ext4fs_dirhash(dir, fname_name(fname), fname_len(fname), hinfo);
781 hash = hinfo->hash;
782
783 if (root->info.unused_flags & 1) {
784 ext4_warning_inode(dir, "Unimplemented hash flags: %#06x",
785 root->info.unused_flags);
786 goto fail;
787 }
788
789 indirect = root->info.indirect_levels;
790 if (indirect >= ext4_dir_htree_level(dir->i_sb)) {
791 ext4_warning(dir->i_sb,
792 "Directory (ino: %lu) htree depth %#06x exceed"
793 "supported value", dir->i_ino,
794 ext4_dir_htree_level(dir->i_sb));
795 if (ext4_dir_htree_level(dir->i_sb) < EXT4_HTREE_LEVEL) {
796 ext4_warning(dir->i_sb, "Enable large directory "
797 "feature to access it");
798 }
799 goto fail;
800 }
801
802 entries = (struct dx_entry *)(((char *)&root->info) +
803 root->info.info_length);
804
805 if (dx_get_limit(entries) != dx_root_limit(dir,
806 root->info.info_length)) {
807 ext4_warning_inode(dir, "dx entry: limit %u != root limit %u",
808 dx_get_limit(entries),
809 dx_root_limit(dir, root->info.info_length));
810 goto fail;
811 }
812
813 dxtrace(printk("Look up %x", hash));
814 while (1) {
815 count = dx_get_count(entries);
816 if (!count || count > dx_get_limit(entries)) {
817 ext4_warning_inode(dir,
818 "dx entry: count %u beyond limit %u",
819 count, dx_get_limit(entries));
820 goto fail;
821 }
822
823 p = entries + 1;
824 q = entries + count - 1;
825 while (p <= q) {
826 m = p + (q - p) / 2;
827 dxtrace(printk(KERN_CONT "."));
828 if (dx_get_hash(m) > hash)
829 q = m - 1;
830 else
831 p = m + 1;
832 }
833
834 if (0) {
835 unsigned n = count - 1;
836 at = entries;
837 while (n--)
838 {
839 dxtrace(printk(KERN_CONT ","));
840 if (dx_get_hash(++at) > hash)
841 {
842 at--;
843 break;
844 }
845 }
846 assert (at == p - 1);
847 }
848
849 at = p - 1;
850 dxtrace(printk(KERN_CONT " %x->%u\n",
851 at == entries ? 0 : dx_get_hash(at),
852 dx_get_block(at)));
853 frame->entries = entries;
854 frame->at = at;
855 if (!indirect--)
856 return frame;
857 frame++;
858 frame->bh = ext4_read_dirblock(dir, dx_get_block(at), INDEX);
859 if (IS_ERR(frame->bh)) {
860 ret_err = (struct dx_frame *) frame->bh;
861 frame->bh = NULL;
862 goto fail;
863 }
864 entries = ((struct dx_node *) frame->bh->b_data)->entries;
865
866 if (dx_get_limit(entries) != dx_node_limit(dir)) {
867 ext4_warning_inode(dir,
868 "dx entry: limit %u != node limit %u",
869 dx_get_limit(entries), dx_node_limit(dir));
870 goto fail;
871 }
872 }
873fail:
874 while (frame >= frame_in) {
875 brelse(frame->bh);
876 frame--;
877 }
878
879 if (ret_err == ERR_PTR(ERR_BAD_DX_DIR))
880 ext4_warning_inode(dir,
881 "Corrupt directory, running e2fsck is recommended");
882 return ret_err;
883}
884
885static void dx_release(struct dx_frame *frames)
886{
887 struct dx_root_info *info;
888 int i;
889 unsigned int indirect_levels;
890
891 if (frames[0].bh == NULL)
892 return;
893
894 info = &((struct dx_root *)frames[0].bh->b_data)->info;
895
896 indirect_levels = info->indirect_levels;
897 for (i = 0; i <= indirect_levels; i++) {
898 if (frames[i].bh == NULL)
899 break;
900 brelse(frames[i].bh);
901 frames[i].bh = NULL;
902 }
903}
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922static int ext4_htree_next_block(struct inode *dir, __u32 hash,
923 struct dx_frame *frame,
924 struct dx_frame *frames,
925 __u32 *start_hash)
926{
927 struct dx_frame *p;
928 struct buffer_head *bh;
929 int num_frames = 0;
930 __u32 bhash;
931
932 p = frame;
933
934
935
936
937
938
939
940 while (1) {
941 if (++(p->at) < p->entries + dx_get_count(p->entries))
942 break;
943 if (p == frames)
944 return 0;
945 num_frames++;
946 p--;
947 }
948
949
950
951
952
953
954
955
956 bhash = dx_get_hash(p->at);
957 if (start_hash)
958 *start_hash = bhash;
959 if ((hash & 1) == 0) {
960 if ((bhash & ~1) != hash)
961 return 0;
962 }
963
964
965
966
967 while (num_frames--) {
968 bh = ext4_read_dirblock(dir, dx_get_block(p->at), INDEX);
969 if (IS_ERR(bh))
970 return PTR_ERR(bh);
971 p++;
972 brelse(p->bh);
973 p->bh = bh;
974 p->at = p->entries = ((struct dx_node *) bh->b_data)->entries;
975 }
976 return 1;
977}
978
979
980
981
982
983
984
985static int htree_dirblock_to_tree(struct file *dir_file,
986 struct inode *dir, ext4_lblk_t block,
987 struct dx_hash_info *hinfo,
988 __u32 start_hash, __u32 start_minor_hash)
989{
990 struct buffer_head *bh;
991 struct ext4_dir_entry_2 *de, *top;
992 int err = 0, count = 0;
993 struct fscrypt_str fname_crypto_str = FSTR_INIT(NULL, 0), tmp_str;
994
995 dxtrace(printk(KERN_INFO "In htree dirblock_to_tree: block %lu\n",
996 (unsigned long)block));
997 bh = ext4_read_dirblock(dir, block, DIRENT_HTREE);
998 if (IS_ERR(bh))
999 return PTR_ERR(bh);
1000
1001 de = (struct ext4_dir_entry_2 *) bh->b_data;
1002 top = (struct ext4_dir_entry_2 *) ((char *) de +
1003 dir->i_sb->s_blocksize -
1004 EXT4_DIR_REC_LEN(0));
1005#ifdef CONFIG_FS_ENCRYPTION
1006
1007 if (IS_ENCRYPTED(dir)) {
1008 err = fscrypt_get_encryption_info(dir);
1009 if (err < 0) {
1010 brelse(bh);
1011 return err;
1012 }
1013 err = fscrypt_fname_alloc_buffer(dir, EXT4_NAME_LEN,
1014 &fname_crypto_str);
1015 if (err < 0) {
1016 brelse(bh);
1017 return err;
1018 }
1019 }
1020#endif
1021 for (; de < top; de = ext4_next_entry(de, dir->i_sb->s_blocksize)) {
1022 if (ext4_check_dir_entry(dir, NULL, de, bh,
1023 bh->b_data, bh->b_size,
1024 (block<<EXT4_BLOCK_SIZE_BITS(dir->i_sb))
1025 + ((char *)de - bh->b_data))) {
1026
1027 break;
1028 }
1029 ext4fs_dirhash(dir, de->name, de->name_len, hinfo);
1030 if ((hinfo->hash < start_hash) ||
1031 ((hinfo->hash == start_hash) &&
1032 (hinfo->minor_hash < start_minor_hash)))
1033 continue;
1034 if (de->inode == 0)
1035 continue;
1036 if (!IS_ENCRYPTED(dir)) {
1037 tmp_str.name = de->name;
1038 tmp_str.len = de->name_len;
1039 err = ext4_htree_store_dirent(dir_file,
1040 hinfo->hash, hinfo->minor_hash, de,
1041 &tmp_str);
1042 } else {
1043 int save_len = fname_crypto_str.len;
1044 struct fscrypt_str de_name = FSTR_INIT(de->name,
1045 de->name_len);
1046
1047
1048 err = fscrypt_fname_disk_to_usr(dir, hinfo->hash,
1049 hinfo->minor_hash, &de_name,
1050 &fname_crypto_str);
1051 if (err) {
1052 count = err;
1053 goto errout;
1054 }
1055 err = ext4_htree_store_dirent(dir_file,
1056 hinfo->hash, hinfo->minor_hash, de,
1057 &fname_crypto_str);
1058 fname_crypto_str.len = save_len;
1059 }
1060 if (err != 0) {
1061 count = err;
1062 goto errout;
1063 }
1064 count++;
1065 }
1066errout:
1067 brelse(bh);
1068#ifdef CONFIG_FS_ENCRYPTION
1069 fscrypt_fname_free_buffer(&fname_crypto_str);
1070#endif
1071 return count;
1072}
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
1084 __u32 start_minor_hash, __u32 *next_hash)
1085{
1086 struct dx_hash_info hinfo;
1087 struct ext4_dir_entry_2 *de;
1088 struct dx_frame frames[EXT4_HTREE_LEVEL], *frame;
1089 struct inode *dir;
1090 ext4_lblk_t block;
1091 int count = 0;
1092 int ret, err;
1093 __u32 hashval;
1094 struct fscrypt_str tmp_str;
1095
1096 dxtrace(printk(KERN_DEBUG "In htree_fill_tree, start hash: %x:%x\n",
1097 start_hash, start_minor_hash));
1098 dir = file_inode(dir_file);
1099 if (!(ext4_test_inode_flag(dir, EXT4_INODE_INDEX))) {
1100 hinfo.hash_version = EXT4_SB(dir->i_sb)->s_def_hash_version;
1101 if (hinfo.hash_version <= DX_HASH_TEA)
1102 hinfo.hash_version +=
1103 EXT4_SB(dir->i_sb)->s_hash_unsigned;
1104 hinfo.seed = EXT4_SB(dir->i_sb)->s_hash_seed;
1105 if (ext4_has_inline_data(dir)) {
1106 int has_inline_data = 1;
1107 count = ext4_inlinedir_to_tree(dir_file, dir, 0,
1108 &hinfo, start_hash,
1109 start_minor_hash,
1110 &has_inline_data);
1111 if (has_inline_data) {
1112 *next_hash = ~0;
1113 return count;
1114 }
1115 }
1116 count = htree_dirblock_to_tree(dir_file, dir, 0, &hinfo,
1117 start_hash, start_minor_hash);
1118 *next_hash = ~0;
1119 return count;
1120 }
1121 hinfo.hash = start_hash;
1122 hinfo.minor_hash = 0;
1123 frame = dx_probe(NULL, dir, &hinfo, frames);
1124 if (IS_ERR(frame))
1125 return PTR_ERR(frame);
1126
1127
1128 if (!start_hash && !start_minor_hash) {
1129 de = (struct ext4_dir_entry_2 *) frames[0].bh->b_data;
1130 tmp_str.name = de->name;
1131 tmp_str.len = de->name_len;
1132 err = ext4_htree_store_dirent(dir_file, 0, 0,
1133 de, &tmp_str);
1134 if (err != 0)
1135 goto errout;
1136 count++;
1137 }
1138 if (start_hash < 2 || (start_hash ==2 && start_minor_hash==0)) {
1139 de = (struct ext4_dir_entry_2 *) frames[0].bh->b_data;
1140 de = ext4_next_entry(de, dir->i_sb->s_blocksize);
1141 tmp_str.name = de->name;
1142 tmp_str.len = de->name_len;
1143 err = ext4_htree_store_dirent(dir_file, 2, 0,
1144 de, &tmp_str);
1145 if (err != 0)
1146 goto errout;
1147 count++;
1148 }
1149
1150 while (1) {
1151 if (fatal_signal_pending(current)) {
1152 err = -ERESTARTSYS;
1153 goto errout;
1154 }
1155 cond_resched();
1156 block = dx_get_block(frame->at);
1157 ret = htree_dirblock_to_tree(dir_file, dir, block, &hinfo,
1158 start_hash, start_minor_hash);
1159 if (ret < 0) {
1160 err = ret;
1161 goto errout;
1162 }
1163 count += ret;
1164 hashval = ~0;
1165 ret = ext4_htree_next_block(dir, HASH_NB_ALWAYS,
1166 frame, frames, &hashval);
1167 *next_hash = hashval;
1168 if (ret < 0) {
1169 err = ret;
1170 goto errout;
1171 }
1172
1173
1174
1175
1176
1177 if ((ret == 0) ||
1178 (count && ((hashval & 1) == 0)))
1179 break;
1180 }
1181 dx_release(frames);
1182 dxtrace(printk(KERN_DEBUG "Fill tree: returned %d entries, "
1183 "next hash: %x\n", count, *next_hash));
1184 return count;
1185errout:
1186 dx_release(frames);
1187 return (err);
1188}
1189
1190static inline int search_dirblock(struct buffer_head *bh,
1191 struct inode *dir,
1192 struct ext4_filename *fname,
1193 unsigned int offset,
1194 struct ext4_dir_entry_2 **res_dir)
1195{
1196 return ext4_search_dir(bh, bh->b_data, dir->i_sb->s_blocksize, dir,
1197 fname, offset, res_dir);
1198}
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208static int dx_make_map(struct inode *dir, struct ext4_dir_entry_2 *de,
1209 unsigned blocksize, struct dx_hash_info *hinfo,
1210 struct dx_map_entry *map_tail)
1211{
1212 int count = 0;
1213 char *base = (char *) de;
1214 struct dx_hash_info h = *hinfo;
1215
1216 while ((char *) de < base + blocksize) {
1217 if (de->name_len && de->inode) {
1218 ext4fs_dirhash(dir, de->name, de->name_len, &h);
1219 map_tail--;
1220 map_tail->hash = h.hash;
1221 map_tail->offs = ((char *) de - base)>>2;
1222 map_tail->size = le16_to_cpu(de->rec_len);
1223 count++;
1224 cond_resched();
1225 }
1226
1227 de = ext4_next_entry(de, blocksize);
1228 }
1229 return count;
1230}
1231
1232
1233static void dx_sort_map (struct dx_map_entry *map, unsigned count)
1234{
1235 struct dx_map_entry *p, *q, *top = map + count - 1;
1236 int more;
1237
1238 while (count > 2) {
1239 count = count*10/13;
1240 if (count - 9 < 2)
1241 count = 11;
1242 for (p = top, q = p - count; q >= map; p--, q--)
1243 if (p->hash < q->hash)
1244 swap(*p, *q);
1245 }
1246
1247 do {
1248 more = 0;
1249 q = top;
1250 while (q-- > map) {
1251 if (q[1].hash >= q[0].hash)
1252 continue;
1253 swap(*(q+1), *q);
1254 more = 1;
1255 }
1256 } while(more);
1257}
1258
1259static void dx_insert_block(struct dx_frame *frame, u32 hash, ext4_lblk_t block)
1260{
1261 struct dx_entry *entries = frame->entries;
1262 struct dx_entry *old = frame->at, *new = old + 1;
1263 int count = dx_get_count(entries);
1264
1265 assert(count < dx_get_limit(entries));
1266 assert(old < entries + count);
1267 memmove(new + 1, new, (char *)(entries + count) - (char *)(new));
1268 dx_set_hash(new, hash);
1269 dx_set_block(new, block);
1270 dx_set_count(entries, count + 1);
1271}
1272
1273#ifdef CONFIG_UNICODE
1274
1275
1276
1277
1278
1279
1280
1281
1282int ext4_ci_compare(const struct inode *parent, const struct qstr *name,
1283 const struct qstr *entry, bool quick)
1284{
1285 const struct ext4_sb_info *sbi = EXT4_SB(parent->i_sb);
1286 const struct unicode_map *um = sbi->s_encoding;
1287 int ret;
1288
1289 if (quick)
1290 ret = utf8_strncasecmp_folded(um, name, entry);
1291 else
1292 ret = utf8_strncasecmp(um, name, entry);
1293
1294 if (ret < 0) {
1295
1296
1297
1298 if (ext4_has_strict_mode(sbi))
1299 return -EINVAL;
1300
1301 if (name->len != entry->len)
1302 return 1;
1303
1304 return !!memcmp(name->name, entry->name, name->len);
1305 }
1306
1307 return ret;
1308}
1309
1310void ext4_fname_setup_ci_filename(struct inode *dir, const struct qstr *iname,
1311 struct fscrypt_str *cf_name)
1312{
1313 int len;
1314
1315 if (!IS_CASEFOLDED(dir)) {
1316 cf_name->name = NULL;
1317 return;
1318 }
1319
1320 cf_name->name = kmalloc(EXT4_NAME_LEN, GFP_NOFS);
1321 if (!cf_name->name)
1322 return;
1323
1324 len = utf8_casefold(EXT4_SB(dir->i_sb)->s_encoding,
1325 iname, cf_name->name,
1326 EXT4_NAME_LEN);
1327 if (len <= 0) {
1328 kfree(cf_name->name);
1329 cf_name->name = NULL;
1330 return;
1331 }
1332 cf_name->len = (unsigned) len;
1333
1334}
1335#endif
1336
1337
1338
1339
1340
1341
1342static inline bool ext4_match(const struct inode *parent,
1343 const struct ext4_filename *fname,
1344 const struct ext4_dir_entry_2 *de)
1345{
1346 struct fscrypt_name f;
1347#ifdef CONFIG_UNICODE
1348 const struct qstr entry = {.name = de->name, .len = de->name_len};
1349#endif
1350
1351 if (!de->inode)
1352 return false;
1353
1354 f.usr_fname = fname->usr_fname;
1355 f.disk_name = fname->disk_name;
1356#ifdef CONFIG_FS_ENCRYPTION
1357 f.crypto_buf = fname->crypto_buf;
1358#endif
1359
1360#ifdef CONFIG_UNICODE
1361 if (EXT4_SB(parent->i_sb)->s_encoding && IS_CASEFOLDED(parent)) {
1362 if (fname->cf_name.name) {
1363 struct qstr cf = {.name = fname->cf_name.name,
1364 .len = fname->cf_name.len};
1365 return !ext4_ci_compare(parent, &cf, &entry, true);
1366 }
1367 return !ext4_ci_compare(parent, fname->usr_fname, &entry,
1368 false);
1369 }
1370#endif
1371
1372 return fscrypt_match_name(&f, de->name, de->name_len);
1373}
1374
1375
1376
1377
1378int ext4_search_dir(struct buffer_head *bh, char *search_buf, int buf_size,
1379 struct inode *dir, struct ext4_filename *fname,
1380 unsigned int offset, struct ext4_dir_entry_2 **res_dir)
1381{
1382 struct ext4_dir_entry_2 * de;
1383 char * dlimit;
1384 int de_len;
1385
1386 de = (struct ext4_dir_entry_2 *)search_buf;
1387 dlimit = search_buf + buf_size;
1388 while ((char *) de < dlimit) {
1389
1390
1391 if ((char *) de + de->name_len <= dlimit &&
1392 ext4_match(dir, fname, de)) {
1393
1394
1395 if (ext4_check_dir_entry(dir, NULL, de, bh, bh->b_data,
1396 bh->b_size, offset))
1397 return -1;
1398 *res_dir = de;
1399 return 1;
1400 }
1401
1402 de_len = ext4_rec_len_from_disk(de->rec_len,
1403 dir->i_sb->s_blocksize);
1404 if (de_len <= 0)
1405 return -1;
1406 offset += de_len;
1407 de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
1408 }
1409 return 0;
1410}
1411
1412static int is_dx_internal_node(struct inode *dir, ext4_lblk_t block,
1413 struct ext4_dir_entry *de)
1414{
1415 struct super_block *sb = dir->i_sb;
1416
1417 if (!is_dx(dir))
1418 return 0;
1419 if (block == 0)
1420 return 1;
1421 if (de->inode == 0 &&
1422 ext4_rec_len_from_disk(de->rec_len, sb->s_blocksize) ==
1423 sb->s_blocksize)
1424 return 1;
1425 return 0;
1426}
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439static struct buffer_head *__ext4_find_entry(struct inode *dir,
1440 struct ext4_filename *fname,
1441 struct ext4_dir_entry_2 **res_dir,
1442 int *inlined)
1443{
1444 struct super_block *sb;
1445 struct buffer_head *bh_use[NAMEI_RA_SIZE];
1446 struct buffer_head *bh, *ret = NULL;
1447 ext4_lblk_t start, block;
1448 const u8 *name = fname->usr_fname->name;
1449 size_t ra_max = 0;
1450
1451 size_t ra_ptr = 0;
1452
1453 ext4_lblk_t nblocks;
1454 int i, namelen, retval;
1455
1456 *res_dir = NULL;
1457 sb = dir->i_sb;
1458 namelen = fname->usr_fname->len;
1459 if (namelen > EXT4_NAME_LEN)
1460 return NULL;
1461
1462 if (ext4_has_inline_data(dir)) {
1463 int has_inline_data = 1;
1464 ret = ext4_find_inline_entry(dir, fname, res_dir,
1465 &has_inline_data);
1466 if (has_inline_data) {
1467 if (inlined)
1468 *inlined = 1;
1469 goto cleanup_and_exit;
1470 }
1471 }
1472
1473 if ((namelen <= 2) && (name[0] == '.') &&
1474 (name[1] == '.' || name[1] == '\0')) {
1475
1476
1477
1478
1479 block = start = 0;
1480 nblocks = 1;
1481 goto restart;
1482 }
1483 if (is_dx(dir)) {
1484 ret = ext4_dx_find_entry(dir, fname, res_dir);
1485
1486
1487
1488
1489
1490 if (!IS_ERR(ret) || PTR_ERR(ret) != ERR_BAD_DX_DIR)
1491 goto cleanup_and_exit;
1492 dxtrace(printk(KERN_DEBUG "ext4_find_entry: dx failed, "
1493 "falling back\n"));
1494 ret = NULL;
1495 }
1496 nblocks = dir->i_size >> EXT4_BLOCK_SIZE_BITS(sb);
1497 if (!nblocks) {
1498 ret = NULL;
1499 goto cleanup_and_exit;
1500 }
1501 start = EXT4_I(dir)->i_dir_start_lookup;
1502 if (start >= nblocks)
1503 start = 0;
1504 block = start;
1505restart:
1506 do {
1507
1508
1509
1510 if (ra_ptr >= ra_max) {
1511
1512 ra_ptr = 0;
1513 if (block < start)
1514 ra_max = start - block;
1515 else
1516 ra_max = nblocks - block;
1517 ra_max = min(ra_max, ARRAY_SIZE(bh_use));
1518 retval = ext4_bread_batch(dir, block, ra_max,
1519 false , bh_use);
1520 if (retval) {
1521 ret = ERR_PTR(retval);
1522 ra_max = 0;
1523 goto cleanup_and_exit;
1524 }
1525 }
1526 if ((bh = bh_use[ra_ptr++]) == NULL)
1527 goto next;
1528 wait_on_buffer(bh);
1529 if (!buffer_uptodate(bh)) {
1530 EXT4_ERROR_INODE(dir, "reading directory lblock %lu",
1531 (unsigned long) block);
1532 brelse(bh);
1533 ret = ERR_PTR(-EIO);
1534 goto cleanup_and_exit;
1535 }
1536 if (!buffer_verified(bh) &&
1537 !is_dx_internal_node(dir, block,
1538 (struct ext4_dir_entry *)bh->b_data) &&
1539 !ext4_dirblock_csum_verify(dir, bh)) {
1540 EXT4_ERROR_INODE(dir, "checksumming directory "
1541 "block %lu", (unsigned long)block);
1542 brelse(bh);
1543 ret = ERR_PTR(-EFSBADCRC);
1544 goto cleanup_and_exit;
1545 }
1546 set_buffer_verified(bh);
1547 i = search_dirblock(bh, dir, fname,
1548 block << EXT4_BLOCK_SIZE_BITS(sb), res_dir);
1549 if (i == 1) {
1550 EXT4_I(dir)->i_dir_start_lookup = block;
1551 ret = bh;
1552 goto cleanup_and_exit;
1553 } else {
1554 brelse(bh);
1555 if (i < 0)
1556 goto cleanup_and_exit;
1557 }
1558 next:
1559 if (++block >= nblocks)
1560 block = 0;
1561 } while (block != start);
1562
1563
1564
1565
1566
1567 block = nblocks;
1568 nblocks = dir->i_size >> EXT4_BLOCK_SIZE_BITS(sb);
1569 if (block < nblocks) {
1570 start = 0;
1571 goto restart;
1572 }
1573
1574cleanup_and_exit:
1575
1576 for (; ra_ptr < ra_max; ra_ptr++)
1577 brelse(bh_use[ra_ptr]);
1578 return ret;
1579}
1580
1581static struct buffer_head *ext4_find_entry(struct inode *dir,
1582 const struct qstr *d_name,
1583 struct ext4_dir_entry_2 **res_dir,
1584 int *inlined)
1585{
1586 int err;
1587 struct ext4_filename fname;
1588 struct buffer_head *bh;
1589
1590 err = ext4_fname_setup_filename(dir, d_name, 1, &fname);
1591 if (err == -ENOENT)
1592 return NULL;
1593 if (err)
1594 return ERR_PTR(err);
1595
1596 bh = __ext4_find_entry(dir, &fname, res_dir, inlined);
1597
1598 ext4_fname_free_filename(&fname);
1599 return bh;
1600}
1601
1602static struct buffer_head *ext4_lookup_entry(struct inode *dir,
1603 struct dentry *dentry,
1604 struct ext4_dir_entry_2 **res_dir)
1605{
1606 int err;
1607 struct ext4_filename fname;
1608 struct buffer_head *bh;
1609
1610 err = ext4_fname_prepare_lookup(dir, dentry, &fname);
1611 if (err == -ENOENT)
1612 return NULL;
1613 if (err)
1614 return ERR_PTR(err);
1615
1616 bh = __ext4_find_entry(dir, &fname, res_dir, NULL);
1617
1618 ext4_fname_free_filename(&fname);
1619 return bh;
1620}
1621
1622static struct buffer_head * ext4_dx_find_entry(struct inode *dir,
1623 struct ext4_filename *fname,
1624 struct ext4_dir_entry_2 **res_dir)
1625{
1626 struct super_block * sb = dir->i_sb;
1627 struct dx_frame frames[EXT4_HTREE_LEVEL], *frame;
1628 struct buffer_head *bh;
1629 ext4_lblk_t block;
1630 int retval;
1631
1632#ifdef CONFIG_FS_ENCRYPTION
1633 *res_dir = NULL;
1634#endif
1635 frame = dx_probe(fname, dir, NULL, frames);
1636 if (IS_ERR(frame))
1637 return (struct buffer_head *) frame;
1638 do {
1639 block = dx_get_block(frame->at);
1640 bh = ext4_read_dirblock(dir, block, DIRENT_HTREE);
1641 if (IS_ERR(bh))
1642 goto errout;
1643
1644 retval = search_dirblock(bh, dir, fname,
1645 block << EXT4_BLOCK_SIZE_BITS(sb),
1646 res_dir);
1647 if (retval == 1)
1648 goto success;
1649 brelse(bh);
1650 if (retval == -1) {
1651 bh = ERR_PTR(ERR_BAD_DX_DIR);
1652 goto errout;
1653 }
1654
1655
1656 retval = ext4_htree_next_block(dir, fname->hinfo.hash, frame,
1657 frames, NULL);
1658 if (retval < 0) {
1659 ext4_warning_inode(dir,
1660 "error %d reading directory index block",
1661 retval);
1662 bh = ERR_PTR(retval);
1663 goto errout;
1664 }
1665 } while (retval == 1);
1666
1667 bh = NULL;
1668errout:
1669 dxtrace(printk(KERN_DEBUG "%s not found\n", fname->usr_fname->name));
1670success:
1671 dx_release(frames);
1672 return bh;
1673}
1674
1675static struct dentry *ext4_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
1676{
1677 struct inode *inode;
1678 struct ext4_dir_entry_2 *de;
1679 struct buffer_head *bh;
1680
1681 if (dentry->d_name.len > EXT4_NAME_LEN)
1682 return ERR_PTR(-ENAMETOOLONG);
1683
1684 bh = ext4_lookup_entry(dir, dentry, &de);
1685 if (IS_ERR(bh))
1686 return ERR_CAST(bh);
1687 inode = NULL;
1688 if (bh) {
1689 __u32 ino = le32_to_cpu(de->inode);
1690 brelse(bh);
1691 if (!ext4_valid_inum(dir->i_sb, ino)) {
1692 EXT4_ERROR_INODE(dir, "bad inode number: %u", ino);
1693 return ERR_PTR(-EFSCORRUPTED);
1694 }
1695 if (unlikely(ino == dir->i_ino)) {
1696 EXT4_ERROR_INODE(dir, "'%pd' linked to parent dir",
1697 dentry);
1698 return ERR_PTR(-EFSCORRUPTED);
1699 }
1700 inode = ext4_iget(dir->i_sb, ino, EXT4_IGET_NORMAL);
1701 if (inode == ERR_PTR(-ESTALE)) {
1702 EXT4_ERROR_INODE(dir,
1703 "deleted inode referenced: %u",
1704 ino);
1705 return ERR_PTR(-EFSCORRUPTED);
1706 }
1707 if (!IS_ERR(inode) && IS_ENCRYPTED(dir) &&
1708 (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
1709 !fscrypt_has_permitted_context(dir, inode)) {
1710 ext4_warning(inode->i_sb,
1711 "Inconsistent encryption contexts: %lu/%lu",
1712 dir->i_ino, inode->i_ino);
1713 iput(inode);
1714 return ERR_PTR(-EPERM);
1715 }
1716 }
1717
1718#ifdef CONFIG_UNICODE
1719 if (!inode && IS_CASEFOLDED(dir)) {
1720
1721
1722
1723
1724
1725 return NULL;
1726 }
1727#endif
1728 return d_splice_alias(inode, dentry);
1729}
1730
1731
1732struct dentry *ext4_get_parent(struct dentry *child)
1733{
1734 __u32 ino;
1735 static const struct qstr dotdot = QSTR_INIT("..", 2);
1736 struct ext4_dir_entry_2 * de;
1737 struct buffer_head *bh;
1738
1739 bh = ext4_find_entry(d_inode(child), &dotdot, &de, NULL);
1740 if (IS_ERR(bh))
1741 return ERR_CAST(bh);
1742 if (!bh)
1743 return ERR_PTR(-ENOENT);
1744 ino = le32_to_cpu(de->inode);
1745 brelse(bh);
1746
1747 if (!ext4_valid_inum(child->d_sb, ino)) {
1748 EXT4_ERROR_INODE(d_inode(child),
1749 "bad parent inode number: %u", ino);
1750 return ERR_PTR(-EFSCORRUPTED);
1751 }
1752
1753 return d_obtain_alias(ext4_iget(child->d_sb, ino, EXT4_IGET_NORMAL));
1754}
1755
1756
1757
1758
1759
1760static struct ext4_dir_entry_2 *
1761dx_move_dirents(char *from, char *to, struct dx_map_entry *map, int count,
1762 unsigned blocksize)
1763{
1764 unsigned rec_len = 0;
1765
1766 while (count--) {
1767 struct ext4_dir_entry_2 *de = (struct ext4_dir_entry_2 *)
1768 (from + (map->offs<<2));
1769 rec_len = EXT4_DIR_REC_LEN(de->name_len);
1770 memcpy (to, de, rec_len);
1771 ((struct ext4_dir_entry_2 *) to)->rec_len =
1772 ext4_rec_len_to_disk(rec_len, blocksize);
1773 de->inode = 0;
1774 map++;
1775 to += rec_len;
1776 }
1777 return (struct ext4_dir_entry_2 *) (to - rec_len);
1778}
1779
1780
1781
1782
1783
1784static struct ext4_dir_entry_2* dx_pack_dirents(char *base, unsigned blocksize)
1785{
1786 struct ext4_dir_entry_2 *next, *to, *prev, *de = (struct ext4_dir_entry_2 *) base;
1787 unsigned rec_len = 0;
1788
1789 prev = to = de;
1790 while ((char*)de < base + blocksize) {
1791 next = ext4_next_entry(de, blocksize);
1792 if (de->inode && de->name_len) {
1793 rec_len = EXT4_DIR_REC_LEN(de->name_len);
1794 if (de > to)
1795 memmove(to, de, rec_len);
1796 to->rec_len = ext4_rec_len_to_disk(rec_len, blocksize);
1797 prev = to;
1798 to = (struct ext4_dir_entry_2 *) (((char *) to) + rec_len);
1799 }
1800 de = next;
1801 }
1802 return prev;
1803}
1804
1805
1806
1807
1808
1809
1810static struct ext4_dir_entry_2 *do_split(handle_t *handle, struct inode *dir,
1811 struct buffer_head **bh,struct dx_frame *frame,
1812 struct dx_hash_info *hinfo)
1813{
1814 unsigned blocksize = dir->i_sb->s_blocksize;
1815 unsigned count, continued;
1816 struct buffer_head *bh2;
1817 ext4_lblk_t newblock;
1818 u32 hash2;
1819 struct dx_map_entry *map;
1820 char *data1 = (*bh)->b_data, *data2;
1821 unsigned split, move, size;
1822 struct ext4_dir_entry_2 *de = NULL, *de2;
1823 int csum_size = 0;
1824 int err = 0, i;
1825
1826 if (ext4_has_metadata_csum(dir->i_sb))
1827 csum_size = sizeof(struct ext4_dir_entry_tail);
1828
1829 bh2 = ext4_append(handle, dir, &newblock);
1830 if (IS_ERR(bh2)) {
1831 brelse(*bh);
1832 *bh = NULL;
1833 return (struct ext4_dir_entry_2 *) bh2;
1834 }
1835
1836 BUFFER_TRACE(*bh, "get_write_access");
1837 err = ext4_journal_get_write_access(handle, *bh);
1838 if (err)
1839 goto journal_error;
1840
1841 BUFFER_TRACE(frame->bh, "get_write_access");
1842 err = ext4_journal_get_write_access(handle, frame->bh);
1843 if (err)
1844 goto journal_error;
1845
1846 data2 = bh2->b_data;
1847
1848
1849 map = (struct dx_map_entry *) (data2 + blocksize);
1850 count = dx_make_map(dir, (struct ext4_dir_entry_2 *) data1,
1851 blocksize, hinfo, map);
1852 map -= count;
1853 dx_sort_map(map, count);
1854
1855 size = 0;
1856 move = 0;
1857 for (i = count-1; i >= 0; i--) {
1858
1859 if (size + map[i].size/2 > blocksize/2)
1860 break;
1861 size += map[i].size;
1862 move++;
1863 }
1864
1865 split = count - move;
1866 hash2 = map[split].hash;
1867 continued = hash2 == map[split - 1].hash;
1868 dxtrace(printk(KERN_INFO "Split block %lu at %x, %i/%i\n",
1869 (unsigned long)dx_get_block(frame->at),
1870 hash2, split, count-split));
1871
1872
1873 de2 = dx_move_dirents(data1, data2, map + split, count - split,
1874 blocksize);
1875 de = dx_pack_dirents(data1, blocksize);
1876 de->rec_len = ext4_rec_len_to_disk(data1 + (blocksize - csum_size) -
1877 (char *) de,
1878 blocksize);
1879 de2->rec_len = ext4_rec_len_to_disk(data2 + (blocksize - csum_size) -
1880 (char *) de2,
1881 blocksize);
1882 if (csum_size) {
1883 ext4_initialize_dirent_tail(*bh, blocksize);
1884 ext4_initialize_dirent_tail(bh2, blocksize);
1885 }
1886
1887 dxtrace(dx_show_leaf(dir, hinfo, (struct ext4_dir_entry_2 *) data1,
1888 blocksize, 1));
1889 dxtrace(dx_show_leaf(dir, hinfo, (struct ext4_dir_entry_2 *) data2,
1890 blocksize, 1));
1891
1892
1893 if (hinfo->hash >= hash2) {
1894 swap(*bh, bh2);
1895 de = de2;
1896 }
1897 dx_insert_block(frame, hash2 + continued, newblock);
1898 err = ext4_handle_dirty_dirblock(handle, dir, bh2);
1899 if (err)
1900 goto journal_error;
1901 err = ext4_handle_dirty_dx_node(handle, dir, frame->bh);
1902 if (err)
1903 goto journal_error;
1904 brelse(bh2);
1905 dxtrace(dx_show_index("frame", frame->entries));
1906 return de;
1907
1908journal_error:
1909 brelse(*bh);
1910 brelse(bh2);
1911 *bh = NULL;
1912 ext4_std_error(dir->i_sb, err);
1913 return ERR_PTR(err);
1914}
1915
1916int ext4_find_dest_de(struct inode *dir, struct inode *inode,
1917 struct buffer_head *bh,
1918 void *buf, int buf_size,
1919 struct ext4_filename *fname,
1920 struct ext4_dir_entry_2 **dest_de)
1921{
1922 struct ext4_dir_entry_2 *de;
1923 unsigned short reclen = EXT4_DIR_REC_LEN(fname_len(fname));
1924 int nlen, rlen;
1925 unsigned int offset = 0;
1926 char *top;
1927
1928 de = (struct ext4_dir_entry_2 *)buf;
1929 top = buf + buf_size - reclen;
1930 while ((char *) de <= top) {
1931 if (ext4_check_dir_entry(dir, NULL, de, bh,
1932 buf, buf_size, offset))
1933 return -EFSCORRUPTED;
1934 if (ext4_match(dir, fname, de))
1935 return -EEXIST;
1936 nlen = EXT4_DIR_REC_LEN(de->name_len);
1937 rlen = ext4_rec_len_from_disk(de->rec_len, buf_size);
1938 if ((de->inode ? rlen - nlen : rlen) >= reclen)
1939 break;
1940 de = (struct ext4_dir_entry_2 *)((char *)de + rlen);
1941 offset += rlen;
1942 }
1943 if ((char *) de > top)
1944 return -ENOSPC;
1945
1946 *dest_de = de;
1947 return 0;
1948}
1949
1950void ext4_insert_dentry(struct inode *inode,
1951 struct ext4_dir_entry_2 *de,
1952 int buf_size,
1953 struct ext4_filename *fname)
1954{
1955
1956 int nlen, rlen;
1957
1958 nlen = EXT4_DIR_REC_LEN(de->name_len);
1959 rlen = ext4_rec_len_from_disk(de->rec_len, buf_size);
1960 if (de->inode) {
1961 struct ext4_dir_entry_2 *de1 =
1962 (struct ext4_dir_entry_2 *)((char *)de + nlen);
1963 de1->rec_len = ext4_rec_len_to_disk(rlen - nlen, buf_size);
1964 de->rec_len = ext4_rec_len_to_disk(nlen, buf_size);
1965 de = de1;
1966 }
1967 de->file_type = EXT4_FT_UNKNOWN;
1968 de->inode = cpu_to_le32(inode->i_ino);
1969 ext4_set_de_type(inode->i_sb, de, inode->i_mode);
1970 de->name_len = fname_len(fname);
1971 memcpy(de->name, fname_name(fname), fname_len(fname));
1972}
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982static int add_dirent_to_buf(handle_t *handle, struct ext4_filename *fname,
1983 struct inode *dir,
1984 struct inode *inode, struct ext4_dir_entry_2 *de,
1985 struct buffer_head *bh)
1986{
1987 unsigned int blocksize = dir->i_sb->s_blocksize;
1988 int csum_size = 0;
1989 int err;
1990
1991 if (ext4_has_metadata_csum(inode->i_sb))
1992 csum_size = sizeof(struct ext4_dir_entry_tail);
1993
1994 if (!de) {
1995 err = ext4_find_dest_de(dir, inode, bh, bh->b_data,
1996 blocksize - csum_size, fname, &de);
1997 if (err)
1998 return err;
1999 }
2000 BUFFER_TRACE(bh, "get_write_access");
2001 err = ext4_journal_get_write_access(handle, bh);
2002 if (err) {
2003 ext4_std_error(dir->i_sb, err);
2004 return err;
2005 }
2006
2007
2008 ext4_insert_dentry(inode, de, blocksize, fname);
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021 dir->i_mtime = dir->i_ctime = current_time(dir);
2022 ext4_update_dx_flag(dir);
2023 inode_inc_iversion(dir);
2024 ext4_mark_inode_dirty(handle, dir);
2025 BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata");
2026 err = ext4_handle_dirty_dirblock(handle, dir, bh);
2027 if (err)
2028 ext4_std_error(dir->i_sb, err);
2029 return 0;
2030}
2031
2032
2033
2034
2035
2036static int make_indexed_dir(handle_t *handle, struct ext4_filename *fname,
2037 struct inode *dir,
2038 struct inode *inode, struct buffer_head *bh)
2039{
2040 struct buffer_head *bh2;
2041 struct dx_root *root;
2042 struct dx_frame frames[EXT4_HTREE_LEVEL], *frame;
2043 struct dx_entry *entries;
2044 struct ext4_dir_entry_2 *de, *de2;
2045 char *data2, *top;
2046 unsigned len;
2047 int retval;
2048 unsigned blocksize;
2049 ext4_lblk_t block;
2050 struct fake_dirent *fde;
2051 int csum_size = 0;
2052
2053 if (ext4_has_metadata_csum(inode->i_sb))
2054 csum_size = sizeof(struct ext4_dir_entry_tail);
2055
2056 blocksize = dir->i_sb->s_blocksize;
2057 dxtrace(printk(KERN_DEBUG "Creating index: inode %lu\n", dir->i_ino));
2058 BUFFER_TRACE(bh, "get_write_access");
2059 retval = ext4_journal_get_write_access(handle, bh);
2060 if (retval) {
2061 ext4_std_error(dir->i_sb, retval);
2062 brelse(bh);
2063 return retval;
2064 }
2065 root = (struct dx_root *) bh->b_data;
2066
2067
2068 fde = &root->dotdot;
2069 de = (struct ext4_dir_entry_2 *)((char *)fde +
2070 ext4_rec_len_from_disk(fde->rec_len, blocksize));
2071 if ((char *) de >= (((char *) root) + blocksize)) {
2072 EXT4_ERROR_INODE(dir, "invalid rec_len for '..'");
2073 brelse(bh);
2074 return -EFSCORRUPTED;
2075 }
2076 len = ((char *) root) + (blocksize - csum_size) - (char *) de;
2077
2078
2079 bh2 = ext4_append(handle, dir, &block);
2080 if (IS_ERR(bh2)) {
2081 brelse(bh);
2082 return PTR_ERR(bh2);
2083 }
2084 ext4_set_inode_flag(dir, EXT4_INODE_INDEX);
2085 data2 = bh2->b_data;
2086
2087 memcpy(data2, de, len);
2088 de = (struct ext4_dir_entry_2 *) data2;
2089 top = data2 + len;
2090 while ((char *)(de2 = ext4_next_entry(de, blocksize)) < top)
2091 de = de2;
2092 de->rec_len = ext4_rec_len_to_disk(data2 + (blocksize - csum_size) -
2093 (char *) de, blocksize);
2094
2095 if (csum_size)
2096 ext4_initialize_dirent_tail(bh2, blocksize);
2097
2098
2099 de = (struct ext4_dir_entry_2 *) (&root->dotdot);
2100 de->rec_len = ext4_rec_len_to_disk(blocksize - EXT4_DIR_REC_LEN(2),
2101 blocksize);
2102 memset (&root->info, 0, sizeof(root->info));
2103 root->info.info_length = sizeof(root->info);
2104 root->info.hash_version = EXT4_SB(dir->i_sb)->s_def_hash_version;
2105 entries = root->entries;
2106 dx_set_block(entries, 1);
2107 dx_set_count(entries, 1);
2108 dx_set_limit(entries, dx_root_limit(dir, sizeof(root->info)));
2109
2110
2111 fname->hinfo.hash_version = root->info.hash_version;
2112 if (fname->hinfo.hash_version <= DX_HASH_TEA)
2113 fname->hinfo.hash_version += EXT4_SB(dir->i_sb)->s_hash_unsigned;
2114 fname->hinfo.seed = EXT4_SB(dir->i_sb)->s_hash_seed;
2115 ext4fs_dirhash(dir, fname_name(fname), fname_len(fname), &fname->hinfo);
2116
2117 memset(frames, 0, sizeof(frames));
2118 frame = frames;
2119 frame->entries = entries;
2120 frame->at = entries;
2121 frame->bh = bh;
2122
2123 retval = ext4_handle_dirty_dx_node(handle, dir, frame->bh);
2124 if (retval)
2125 goto out_frames;
2126 retval = ext4_handle_dirty_dirblock(handle, dir, bh2);
2127 if (retval)
2128 goto out_frames;
2129
2130 de = do_split(handle,dir, &bh2, frame, &fname->hinfo);
2131 if (IS_ERR(de)) {
2132 retval = PTR_ERR(de);
2133 goto out_frames;
2134 }
2135
2136 retval = add_dirent_to_buf(handle, fname, dir, inode, de, bh2);
2137out_frames:
2138
2139
2140
2141
2142
2143 if (retval)
2144 ext4_mark_inode_dirty(handle, dir);
2145 dx_release(frames);
2146 brelse(bh2);
2147 return retval;
2148}
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160static int ext4_add_entry(handle_t *handle, struct dentry *dentry,
2161 struct inode *inode)
2162{
2163 struct inode *dir = d_inode(dentry->d_parent);
2164 struct buffer_head *bh = NULL;
2165 struct ext4_dir_entry_2 *de;
2166 struct super_block *sb;
2167 struct ext4_sb_info *sbi;
2168 struct ext4_filename fname;
2169 int retval;
2170 int dx_fallback=0;
2171 unsigned blocksize;
2172 ext4_lblk_t block, blocks;
2173 int csum_size = 0;
2174
2175 if (ext4_has_metadata_csum(inode->i_sb))
2176 csum_size = sizeof(struct ext4_dir_entry_tail);
2177
2178 sb = dir->i_sb;
2179 sbi = EXT4_SB(sb);
2180 blocksize = sb->s_blocksize;
2181 if (!dentry->d_name.len)
2182 return -EINVAL;
2183
2184#ifdef CONFIG_UNICODE
2185 if (ext4_has_strict_mode(sbi) && IS_CASEFOLDED(dir) &&
2186 utf8_validate(sbi->s_encoding, &dentry->d_name))
2187 return -EINVAL;
2188#endif
2189
2190 retval = ext4_fname_setup_filename(dir, &dentry->d_name, 0, &fname);
2191 if (retval)
2192 return retval;
2193
2194 if (ext4_has_inline_data(dir)) {
2195 retval = ext4_try_add_inline_entry(handle, &fname, dir, inode);
2196 if (retval < 0)
2197 goto out;
2198 if (retval == 1) {
2199 retval = 0;
2200 goto out;
2201 }
2202 }
2203
2204 if (is_dx(dir)) {
2205 retval = ext4_dx_add_entry(handle, &fname, dir, inode);
2206 if (!retval || (retval != ERR_BAD_DX_DIR))
2207 goto out;
2208 ext4_clear_inode_flag(dir, EXT4_INODE_INDEX);
2209 dx_fallback++;
2210 ext4_mark_inode_dirty(handle, dir);
2211 }
2212 blocks = dir->i_size >> sb->s_blocksize_bits;
2213 for (block = 0; block < blocks; block++) {
2214 bh = ext4_read_dirblock(dir, block, DIRENT);
2215 if (bh == NULL) {
2216 bh = ext4_bread(handle, dir, block,
2217 EXT4_GET_BLOCKS_CREATE);
2218 goto add_to_new_block;
2219 }
2220 if (IS_ERR(bh)) {
2221 retval = PTR_ERR(bh);
2222 bh = NULL;
2223 goto out;
2224 }
2225 retval = add_dirent_to_buf(handle, &fname, dir, inode,
2226 NULL, bh);
2227 if (retval != -ENOSPC)
2228 goto out;
2229
2230 if (blocks == 1 && !dx_fallback &&
2231 ext4_has_feature_dir_index(sb)) {
2232 retval = make_indexed_dir(handle, &fname, dir,
2233 inode, bh);
2234 bh = NULL;
2235 goto out;
2236 }
2237 brelse(bh);
2238 }
2239 bh = ext4_append(handle, dir, &block);
2240add_to_new_block:
2241 if (IS_ERR(bh)) {
2242 retval = PTR_ERR(bh);
2243 bh = NULL;
2244 goto out;
2245 }
2246 de = (struct ext4_dir_entry_2 *) bh->b_data;
2247 de->inode = 0;
2248 de->rec_len = ext4_rec_len_to_disk(blocksize - csum_size, blocksize);
2249
2250 if (csum_size)
2251 ext4_initialize_dirent_tail(bh, blocksize);
2252
2253 retval = add_dirent_to_buf(handle, &fname, dir, inode, de, bh);
2254out:
2255 ext4_fname_free_filename(&fname);
2256 brelse(bh);
2257 if (retval == 0)
2258 ext4_set_inode_state(inode, EXT4_STATE_NEWENTRY);
2259 return retval;
2260}
2261
2262
2263
2264
2265static int ext4_dx_add_entry(handle_t *handle, struct ext4_filename *fname,
2266 struct inode *dir, struct inode *inode)
2267{
2268 struct dx_frame frames[EXT4_HTREE_LEVEL], *frame;
2269 struct dx_entry *entries, *at;
2270 struct buffer_head *bh;
2271 struct super_block *sb = dir->i_sb;
2272 struct ext4_dir_entry_2 *de;
2273 int restart;
2274 int err;
2275
2276again:
2277 restart = 0;
2278 frame = dx_probe(fname, dir, NULL, frames);
2279 if (IS_ERR(frame))
2280 return PTR_ERR(frame);
2281 entries = frame->entries;
2282 at = frame->at;
2283 bh = ext4_read_dirblock(dir, dx_get_block(frame->at), DIRENT_HTREE);
2284 if (IS_ERR(bh)) {
2285 err = PTR_ERR(bh);
2286 bh = NULL;
2287 goto cleanup;
2288 }
2289
2290 BUFFER_TRACE(bh, "get_write_access");
2291 err = ext4_journal_get_write_access(handle, bh);
2292 if (err)
2293 goto journal_error;
2294
2295 err = add_dirent_to_buf(handle, fname, dir, inode, NULL, bh);
2296 if (err != -ENOSPC)
2297 goto cleanup;
2298
2299 err = 0;
2300
2301 dxtrace(printk(KERN_DEBUG "using %u of %u node entries\n",
2302 dx_get_count(entries), dx_get_limit(entries)));
2303
2304 if (dx_get_count(entries) == dx_get_limit(entries)) {
2305 ext4_lblk_t newblock;
2306 int levels = frame - frames + 1;
2307 unsigned int icount;
2308 int add_level = 1;
2309 struct dx_entry *entries2;
2310 struct dx_node *node2;
2311 struct buffer_head *bh2;
2312
2313 while (frame > frames) {
2314 if (dx_get_count((frame - 1)->entries) <
2315 dx_get_limit((frame - 1)->entries)) {
2316 add_level = 0;
2317 break;
2318 }
2319 frame--;
2320 at = frame->at;
2321 entries = frame->entries;
2322 restart = 1;
2323 }
2324 if (add_level && levels == ext4_dir_htree_level(sb)) {
2325 ext4_warning(sb, "Directory (ino: %lu) index full, "
2326 "reach max htree level :%d",
2327 dir->i_ino, levels);
2328 if (ext4_dir_htree_level(sb) < EXT4_HTREE_LEVEL) {
2329 ext4_warning(sb, "Large directory feature is "
2330 "not enabled on this "
2331 "filesystem");
2332 }
2333 err = -ENOSPC;
2334 goto cleanup;
2335 }
2336 icount = dx_get_count(entries);
2337 bh2 = ext4_append(handle, dir, &newblock);
2338 if (IS_ERR(bh2)) {
2339 err = PTR_ERR(bh2);
2340 goto cleanup;
2341 }
2342 node2 = (struct dx_node *)(bh2->b_data);
2343 entries2 = node2->entries;
2344 memset(&node2->fake, 0, sizeof(struct fake_dirent));
2345 node2->fake.rec_len = ext4_rec_len_to_disk(sb->s_blocksize,
2346 sb->s_blocksize);
2347 BUFFER_TRACE(frame->bh, "get_write_access");
2348 err = ext4_journal_get_write_access(handle, frame->bh);
2349 if (err)
2350 goto journal_error;
2351 if (!add_level) {
2352 unsigned icount1 = icount/2, icount2 = icount - icount1;
2353 unsigned hash2 = dx_get_hash(entries + icount1);
2354 dxtrace(printk(KERN_DEBUG "Split index %i/%i\n",
2355 icount1, icount2));
2356
2357 BUFFER_TRACE(frame->bh, "get_write_access");
2358 err = ext4_journal_get_write_access(handle,
2359 (frame - 1)->bh);
2360 if (err)
2361 goto journal_error;
2362
2363 memcpy((char *) entries2, (char *) (entries + icount1),
2364 icount2 * sizeof(struct dx_entry));
2365 dx_set_count(entries, icount1);
2366 dx_set_count(entries2, icount2);
2367 dx_set_limit(entries2, dx_node_limit(dir));
2368
2369
2370 if (at - entries >= icount1) {
2371 frame->at = at = at - entries - icount1 + entries2;
2372 frame->entries = entries = entries2;
2373 swap(frame->bh, bh2);
2374 }
2375 dx_insert_block((frame - 1), hash2, newblock);
2376 dxtrace(dx_show_index("node", frame->entries));
2377 dxtrace(dx_show_index("node",
2378 ((struct dx_node *) bh2->b_data)->entries));
2379 err = ext4_handle_dirty_dx_node(handle, dir, bh2);
2380 if (err)
2381 goto journal_error;
2382 brelse (bh2);
2383 err = ext4_handle_dirty_dx_node(handle, dir,
2384 (frame - 1)->bh);
2385 if (err)
2386 goto journal_error;
2387 if (restart) {
2388 err = ext4_handle_dirty_dx_node(handle, dir,
2389 frame->bh);
2390 goto journal_error;
2391 }
2392 } else {
2393 struct dx_root *dxroot;
2394 memcpy((char *) entries2, (char *) entries,
2395 icount * sizeof(struct dx_entry));
2396 dx_set_limit(entries2, dx_node_limit(dir));
2397
2398
2399 dx_set_count(entries, 1);
2400 dx_set_block(entries + 0, newblock);
2401 dxroot = (struct dx_root *)frames[0].bh->b_data;
2402 dxroot->info.indirect_levels += 1;
2403 dxtrace(printk(KERN_DEBUG
2404 "Creating %d level index...\n",
2405 dxroot->info.indirect_levels));
2406 err = ext4_handle_dirty_dx_node(handle, dir, frame->bh);
2407 if (err)
2408 goto journal_error;
2409 err = ext4_handle_dirty_dx_node(handle, dir, bh2);
2410 brelse(bh2);
2411 restart = 1;
2412 goto journal_error;
2413 }
2414 }
2415 de = do_split(handle, dir, &bh, frame, &fname->hinfo);
2416 if (IS_ERR(de)) {
2417 err = PTR_ERR(de);
2418 goto cleanup;
2419 }
2420 err = add_dirent_to_buf(handle, fname, dir, inode, de, bh);
2421 goto cleanup;
2422
2423journal_error:
2424 ext4_std_error(dir->i_sb, err);
2425cleanup:
2426 brelse(bh);
2427 dx_release(frames);
2428
2429
2430
2431 if (restart && err == 0)
2432 goto again;
2433 return err;
2434}
2435
2436
2437
2438
2439
2440int ext4_generic_delete_entry(handle_t *handle,
2441 struct inode *dir,
2442 struct ext4_dir_entry_2 *de_del,
2443 struct buffer_head *bh,
2444 void *entry_buf,
2445 int buf_size,
2446 int csum_size)
2447{
2448 struct ext4_dir_entry_2 *de, *pde;
2449 unsigned int blocksize = dir->i_sb->s_blocksize;
2450 int i;
2451
2452 i = 0;
2453 pde = NULL;
2454 de = (struct ext4_dir_entry_2 *)entry_buf;
2455 while (i < buf_size - csum_size) {
2456 if (ext4_check_dir_entry(dir, NULL, de, bh,
2457 bh->b_data, bh->b_size, i))
2458 return -EFSCORRUPTED;
2459 if (de == de_del) {
2460 if (pde)
2461 pde->rec_len = ext4_rec_len_to_disk(
2462 ext4_rec_len_from_disk(pde->rec_len,
2463 blocksize) +
2464 ext4_rec_len_from_disk(de->rec_len,
2465 blocksize),
2466 blocksize);
2467 else
2468 de->inode = 0;
2469 inode_inc_iversion(dir);
2470 return 0;
2471 }
2472 i += ext4_rec_len_from_disk(de->rec_len, blocksize);
2473 pde = de;
2474 de = ext4_next_entry(de, blocksize);
2475 }
2476 return -ENOENT;
2477}
2478
2479static int ext4_delete_entry(handle_t *handle,
2480 struct inode *dir,
2481 struct ext4_dir_entry_2 *de_del,
2482 struct buffer_head *bh)
2483{
2484 int err, csum_size = 0;
2485
2486 if (ext4_has_inline_data(dir)) {
2487 int has_inline_data = 1;
2488 err = ext4_delete_inline_entry(handle, dir, de_del, bh,
2489 &has_inline_data);
2490 if (has_inline_data)
2491 return err;
2492 }
2493
2494 if (ext4_has_metadata_csum(dir->i_sb))
2495 csum_size = sizeof(struct ext4_dir_entry_tail);
2496
2497 BUFFER_TRACE(bh, "get_write_access");
2498 err = ext4_journal_get_write_access(handle, bh);
2499 if (unlikely(err))
2500 goto out;
2501
2502 err = ext4_generic_delete_entry(handle, dir, de_del,
2503 bh, bh->b_data,
2504 dir->i_sb->s_blocksize, csum_size);
2505 if (err)
2506 goto out;
2507
2508 BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata");
2509 err = ext4_handle_dirty_dirblock(handle, dir, bh);
2510 if (unlikely(err))
2511 goto out;
2512
2513 return 0;
2514out:
2515 if (err != -ENOENT)
2516 ext4_std_error(dir->i_sb, err);
2517 return err;
2518}
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531static void ext4_inc_count(handle_t *handle, struct inode *inode)
2532{
2533 inc_nlink(inode);
2534 if (is_dx(inode) &&
2535 (inode->i_nlink > EXT4_LINK_MAX || inode->i_nlink == 2))
2536 set_nlink(inode, 1);
2537}
2538
2539
2540
2541
2542
2543static void ext4_dec_count(handle_t *handle, struct inode *inode)
2544{
2545 if (!S_ISDIR(inode->i_mode) || inode->i_nlink > 2)
2546 drop_nlink(inode);
2547}
2548
2549
2550static int ext4_add_nondir(handle_t *handle,
2551 struct dentry *dentry, struct inode *inode)
2552{
2553 int err = ext4_add_entry(handle, dentry, inode);
2554 if (!err) {
2555 ext4_mark_inode_dirty(handle, inode);
2556 d_instantiate_new(dentry, inode);
2557 return 0;
2558 }
2559 drop_nlink(inode);
2560 unlock_new_inode(inode);
2561 iput(inode);
2562 return err;
2563}
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573static int ext4_create(struct inode *dir, struct dentry *dentry, umode_t mode,
2574 bool excl)
2575{
2576 handle_t *handle;
2577 struct inode *inode;
2578 int err, credits, retries = 0;
2579
2580 err = dquot_initialize(dir);
2581 if (err)
2582 return err;
2583
2584 credits = (EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
2585 EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3);
2586retry:
2587 inode = ext4_new_inode_start_handle(dir, mode, &dentry->d_name, 0,
2588 NULL, EXT4_HT_DIR, credits);
2589 handle = ext4_journal_current_handle();
2590 err = PTR_ERR(inode);
2591 if (!IS_ERR(inode)) {
2592 inode->i_op = &ext4_file_inode_operations;
2593 inode->i_fop = &ext4_file_operations;
2594 ext4_set_aops(inode);
2595 err = ext4_add_nondir(handle, dentry, inode);
2596 if (!err && IS_DIRSYNC(dir))
2597 ext4_handle_sync(handle);
2598 }
2599 if (handle)
2600 ext4_journal_stop(handle);
2601 if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries))
2602 goto retry;
2603 return err;
2604}
2605
2606static int ext4_mknod(struct inode *dir, struct dentry *dentry,
2607 umode_t mode, dev_t rdev)
2608{
2609 handle_t *handle;
2610 struct inode *inode;
2611 int err, credits, retries = 0;
2612
2613 err = dquot_initialize(dir);
2614 if (err)
2615 return err;
2616
2617 credits = (EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
2618 EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3);
2619retry:
2620 inode = ext4_new_inode_start_handle(dir, mode, &dentry->d_name, 0,
2621 NULL, EXT4_HT_DIR, credits);
2622 handle = ext4_journal_current_handle();
2623 err = PTR_ERR(inode);
2624 if (!IS_ERR(inode)) {
2625 init_special_inode(inode, inode->i_mode, rdev);
2626 inode->i_op = &ext4_special_inode_operations;
2627 err = ext4_add_nondir(handle, dentry, inode);
2628 if (!err && IS_DIRSYNC(dir))
2629 ext4_handle_sync(handle);
2630 }
2631 if (handle)
2632 ext4_journal_stop(handle);
2633 if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries))
2634 goto retry;
2635 return err;
2636}
2637
2638static int ext4_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
2639{
2640 handle_t *handle;
2641 struct inode *inode;
2642 int err, retries = 0;
2643
2644 err = dquot_initialize(dir);
2645 if (err)
2646 return err;
2647
2648retry:
2649 inode = ext4_new_inode_start_handle(dir, mode,
2650 NULL, 0, NULL,
2651 EXT4_HT_DIR,
2652 EXT4_MAXQUOTAS_INIT_BLOCKS(dir->i_sb) +
2653 4 + EXT4_XATTR_TRANS_BLOCKS);
2654 handle = ext4_journal_current_handle();
2655 err = PTR_ERR(inode);
2656 if (!IS_ERR(inode)) {
2657 inode->i_op = &ext4_file_inode_operations;
2658 inode->i_fop = &ext4_file_operations;
2659 ext4_set_aops(inode);
2660 d_tmpfile(dentry, inode);
2661 err = ext4_orphan_add(handle, inode);
2662 if (err)
2663 goto err_unlock_inode;
2664 mark_inode_dirty(inode);
2665 unlock_new_inode(inode);
2666 }
2667 if (handle)
2668 ext4_journal_stop(handle);
2669 if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries))
2670 goto retry;
2671 return err;
2672err_unlock_inode:
2673 ext4_journal_stop(handle);
2674 unlock_new_inode(inode);
2675 return err;
2676}
2677
2678struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
2679 struct ext4_dir_entry_2 *de,
2680 int blocksize, int csum_size,
2681 unsigned int parent_ino, int dotdot_real_len)
2682{
2683 de->inode = cpu_to_le32(inode->i_ino);
2684 de->name_len = 1;
2685 de->rec_len = ext4_rec_len_to_disk(EXT4_DIR_REC_LEN(de->name_len),
2686 blocksize);
2687 strcpy(de->name, ".");
2688 ext4_set_de_type(inode->i_sb, de, S_IFDIR);
2689
2690 de = ext4_next_entry(de, blocksize);
2691 de->inode = cpu_to_le32(parent_ino);
2692 de->name_len = 2;
2693 if (!dotdot_real_len)
2694 de->rec_len = ext4_rec_len_to_disk(blocksize -
2695 (csum_size + EXT4_DIR_REC_LEN(1)),
2696 blocksize);
2697 else
2698 de->rec_len = ext4_rec_len_to_disk(
2699 EXT4_DIR_REC_LEN(de->name_len), blocksize);
2700 strcpy(de->name, "..");
2701 ext4_set_de_type(inode->i_sb, de, S_IFDIR);
2702
2703 return ext4_next_entry(de, blocksize);
2704}
2705
2706static int ext4_init_new_dir(handle_t *handle, struct inode *dir,
2707 struct inode *inode)
2708{
2709 struct buffer_head *dir_block = NULL;
2710 struct ext4_dir_entry_2 *de;
2711 ext4_lblk_t block = 0;
2712 unsigned int blocksize = dir->i_sb->s_blocksize;
2713 int csum_size = 0;
2714 int err;
2715
2716 if (ext4_has_metadata_csum(dir->i_sb))
2717 csum_size = sizeof(struct ext4_dir_entry_tail);
2718
2719 if (ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) {
2720 err = ext4_try_create_inline_dir(handle, dir, inode);
2721 if (err < 0 && err != -ENOSPC)
2722 goto out;
2723 if (!err)
2724 goto out;
2725 }
2726
2727 inode->i_size = 0;
2728 dir_block = ext4_append(handle, inode, &block);
2729 if (IS_ERR(dir_block))
2730 return PTR_ERR(dir_block);
2731 de = (struct ext4_dir_entry_2 *)dir_block->b_data;
2732 ext4_init_dot_dotdot(inode, de, blocksize, csum_size, dir->i_ino, 0);
2733 set_nlink(inode, 2);
2734 if (csum_size)
2735 ext4_initialize_dirent_tail(dir_block, blocksize);
2736
2737 BUFFER_TRACE(dir_block, "call ext4_handle_dirty_metadata");
2738 err = ext4_handle_dirty_dirblock(handle, inode, dir_block);
2739 if (err)
2740 goto out;
2741 set_buffer_verified(dir_block);
2742out:
2743 brelse(dir_block);
2744 return err;
2745}
2746
2747static int ext4_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
2748{
2749 handle_t *handle;
2750 struct inode *inode;
2751 int err, credits, retries = 0;
2752
2753 if (EXT4_DIR_LINK_MAX(dir))
2754 return -EMLINK;
2755
2756 err = dquot_initialize(dir);
2757 if (err)
2758 return err;
2759
2760 credits = (EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
2761 EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3);
2762retry:
2763 inode = ext4_new_inode_start_handle(dir, S_IFDIR | mode,
2764 &dentry->d_name,
2765 0, NULL, EXT4_HT_DIR, credits);
2766 handle = ext4_journal_current_handle();
2767 err = PTR_ERR(inode);
2768 if (IS_ERR(inode))
2769 goto out_stop;
2770
2771 inode->i_op = &ext4_dir_inode_operations;
2772 inode->i_fop = &ext4_dir_operations;
2773 err = ext4_init_new_dir(handle, dir, inode);
2774 if (err)
2775 goto out_clear_inode;
2776 err = ext4_mark_inode_dirty(handle, inode);
2777 if (!err)
2778 err = ext4_add_entry(handle, dentry, inode);
2779 if (err) {
2780out_clear_inode:
2781 clear_nlink(inode);
2782 unlock_new_inode(inode);
2783 ext4_mark_inode_dirty(handle, inode);
2784 iput(inode);
2785 goto out_stop;
2786 }
2787 ext4_inc_count(handle, dir);
2788 ext4_update_dx_flag(dir);
2789 err = ext4_mark_inode_dirty(handle, dir);
2790 if (err)
2791 goto out_clear_inode;
2792 d_instantiate_new(dentry, inode);
2793 if (IS_DIRSYNC(dir))
2794 ext4_handle_sync(handle);
2795
2796out_stop:
2797 if (handle)
2798 ext4_journal_stop(handle);
2799 if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries))
2800 goto retry;
2801 return err;
2802}
2803
2804
2805
2806
2807bool ext4_empty_dir(struct inode *inode)
2808{
2809 unsigned int offset;
2810 struct buffer_head *bh;
2811 struct ext4_dir_entry_2 *de, *de1;
2812 struct super_block *sb;
2813
2814 if (ext4_has_inline_data(inode)) {
2815 int has_inline_data = 1;
2816 int ret;
2817
2818 ret = empty_inline_dir(inode, &has_inline_data);
2819 if (has_inline_data)
2820 return ret;
2821 }
2822
2823 sb = inode->i_sb;
2824 if (inode->i_size < EXT4_DIR_REC_LEN(1) + EXT4_DIR_REC_LEN(2)) {
2825 EXT4_ERROR_INODE(inode, "invalid size");
2826 return true;
2827 }
2828
2829
2830
2831 bh = ext4_read_dirblock(inode, 0, DIRENT_HTREE);
2832 if (IS_ERR(bh))
2833 return true;
2834
2835 de = (struct ext4_dir_entry_2 *) bh->b_data;
2836 de1 = ext4_next_entry(de, sb->s_blocksize);
2837 if (le32_to_cpu(de->inode) != inode->i_ino ||
2838 le32_to_cpu(de1->inode) == 0 ||
2839 strcmp(".", de->name) || strcmp("..", de1->name)) {
2840 ext4_warning_inode(inode, "directory missing '.' and/or '..'");
2841 brelse(bh);
2842 return true;
2843 }
2844 offset = ext4_rec_len_from_disk(de->rec_len, sb->s_blocksize) +
2845 ext4_rec_len_from_disk(de1->rec_len, sb->s_blocksize);
2846 de = ext4_next_entry(de1, sb->s_blocksize);
2847 while (offset < inode->i_size) {
2848 if ((void *) de >= (void *) (bh->b_data+sb->s_blocksize)) {
2849 unsigned int lblock;
2850 brelse(bh);
2851 lblock = offset >> EXT4_BLOCK_SIZE_BITS(sb);
2852 bh = ext4_read_dirblock(inode, lblock, EITHER);
2853 if (bh == NULL) {
2854 offset += sb->s_blocksize;
2855 continue;
2856 }
2857 if (IS_ERR(bh))
2858 return true;
2859 de = (struct ext4_dir_entry_2 *) bh->b_data;
2860 }
2861 if (ext4_check_dir_entry(inode, NULL, de, bh,
2862 bh->b_data, bh->b_size, offset)) {
2863 de = (struct ext4_dir_entry_2 *)(bh->b_data +
2864 sb->s_blocksize);
2865 offset = (offset | (sb->s_blocksize - 1)) + 1;
2866 continue;
2867 }
2868 if (le32_to_cpu(de->inode)) {
2869 brelse(bh);
2870 return false;
2871 }
2872 offset += ext4_rec_len_from_disk(de->rec_len, sb->s_blocksize);
2873 de = ext4_next_entry(de, sb->s_blocksize);
2874 }
2875 brelse(bh);
2876 return true;
2877}
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891int ext4_orphan_add(handle_t *handle, struct inode *inode)
2892{
2893 struct super_block *sb = inode->i_sb;
2894 struct ext4_sb_info *sbi = EXT4_SB(sb);
2895 struct ext4_iloc iloc;
2896 int err = 0, rc;
2897 bool dirty = false;
2898
2899 if (!sbi->s_journal || is_bad_inode(inode))
2900 return 0;
2901
2902 WARN_ON_ONCE(!(inode->i_state & (I_NEW | I_FREEING)) &&
2903 !inode_is_locked(inode));
2904
2905
2906
2907
2908 if (!list_empty(&EXT4_I(inode)->i_orphan))
2909 return 0;
2910
2911
2912
2913
2914
2915
2916
2917 J_ASSERT((S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
2918 S_ISLNK(inode->i_mode)) || inode->i_nlink == 0);
2919
2920 BUFFER_TRACE(sbi->s_sbh, "get_write_access");
2921 err = ext4_journal_get_write_access(handle, sbi->s_sbh);
2922 if (err)
2923 goto out;
2924
2925 err = ext4_reserve_inode_write(handle, inode, &iloc);
2926 if (err)
2927 goto out;
2928
2929 mutex_lock(&sbi->s_orphan_lock);
2930
2931
2932
2933
2934 if (!NEXT_ORPHAN(inode) || NEXT_ORPHAN(inode) >
2935 (le32_to_cpu(sbi->s_es->s_inodes_count))) {
2936
2937 NEXT_ORPHAN(inode) = le32_to_cpu(sbi->s_es->s_last_orphan);
2938 sbi->s_es->s_last_orphan = cpu_to_le32(inode->i_ino);
2939 dirty = true;
2940 }
2941 list_add(&EXT4_I(inode)->i_orphan, &sbi->s_orphan);
2942 mutex_unlock(&sbi->s_orphan_lock);
2943
2944 if (dirty) {
2945 err = ext4_handle_dirty_super(handle, sb);
2946 rc = ext4_mark_iloc_dirty(handle, inode, &iloc);
2947 if (!err)
2948 err = rc;
2949 if (err) {
2950
2951
2952
2953
2954
2955 mutex_lock(&sbi->s_orphan_lock);
2956 list_del_init(&EXT4_I(inode)->i_orphan);
2957 mutex_unlock(&sbi->s_orphan_lock);
2958 }
2959 } else
2960 brelse(iloc.bh);
2961
2962 jbd_debug(4, "superblock will point to %lu\n", inode->i_ino);
2963 jbd_debug(4, "orphan inode %lu will point to %d\n",
2964 inode->i_ino, NEXT_ORPHAN(inode));
2965out:
2966 ext4_std_error(sb, err);
2967 return err;
2968}
2969
2970
2971
2972
2973
2974int ext4_orphan_del(handle_t *handle, struct inode *inode)
2975{
2976 struct list_head *prev;
2977 struct ext4_inode_info *ei = EXT4_I(inode);
2978 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
2979 __u32 ino_next;
2980 struct ext4_iloc iloc;
2981 int err = 0;
2982
2983 if (!sbi->s_journal && !(sbi->s_mount_state & EXT4_ORPHAN_FS))
2984 return 0;
2985
2986 WARN_ON_ONCE(!(inode->i_state & (I_NEW | I_FREEING)) &&
2987 !inode_is_locked(inode));
2988
2989 if (list_empty(&ei->i_orphan))
2990 return 0;
2991
2992 if (handle) {
2993
2994 err = ext4_reserve_inode_write(handle, inode, &iloc);
2995 }
2996
2997 mutex_lock(&sbi->s_orphan_lock);
2998 jbd_debug(4, "remove inode %lu from orphan list\n", inode->i_ino);
2999
3000 prev = ei->i_orphan.prev;
3001 list_del_init(&ei->i_orphan);
3002
3003
3004
3005
3006
3007 if (!handle || err) {
3008 mutex_unlock(&sbi->s_orphan_lock);
3009 goto out_err;
3010 }
3011
3012 ino_next = NEXT_ORPHAN(inode);
3013 if (prev == &sbi->s_orphan) {
3014 jbd_debug(4, "superblock will point to %u\n", ino_next);
3015 BUFFER_TRACE(sbi->s_sbh, "get_write_access");
3016 err = ext4_journal_get_write_access(handle, sbi->s_sbh);
3017 if (err) {
3018 mutex_unlock(&sbi->s_orphan_lock);
3019 goto out_brelse;
3020 }
3021 sbi->s_es->s_last_orphan = cpu_to_le32(ino_next);
3022 mutex_unlock(&sbi->s_orphan_lock);
3023 err = ext4_handle_dirty_super(handle, inode->i_sb);
3024 } else {
3025 struct ext4_iloc iloc2;
3026 struct inode *i_prev =
3027 &list_entry(prev, struct ext4_inode_info, i_orphan)->vfs_inode;
3028
3029 jbd_debug(4, "orphan inode %lu will point to %u\n",
3030 i_prev->i_ino, ino_next);
3031 err = ext4_reserve_inode_write(handle, i_prev, &iloc2);
3032 if (err) {
3033 mutex_unlock(&sbi->s_orphan_lock);
3034 goto out_brelse;
3035 }
3036 NEXT_ORPHAN(i_prev) = ino_next;
3037 err = ext4_mark_iloc_dirty(handle, i_prev, &iloc2);
3038 mutex_unlock(&sbi->s_orphan_lock);
3039 }
3040 if (err)
3041 goto out_brelse;
3042 NEXT_ORPHAN(inode) = 0;
3043 err = ext4_mark_iloc_dirty(handle, inode, &iloc);
3044out_err:
3045 ext4_std_error(inode->i_sb, err);
3046 return err;
3047
3048out_brelse:
3049 brelse(iloc.bh);
3050 goto out_err;
3051}
3052
3053static int ext4_rmdir(struct inode *dir, struct dentry *dentry)
3054{
3055 int retval;
3056 struct inode *inode;
3057 struct buffer_head *bh;
3058 struct ext4_dir_entry_2 *de;
3059 handle_t *handle = NULL;
3060
3061 if (unlikely(ext4_forced_shutdown(EXT4_SB(dir->i_sb))))
3062 return -EIO;
3063
3064
3065
3066 retval = dquot_initialize(dir);
3067 if (retval)
3068 return retval;
3069 retval = dquot_initialize(d_inode(dentry));
3070 if (retval)
3071 return retval;
3072
3073 retval = -ENOENT;
3074 bh = ext4_find_entry(dir, &dentry->d_name, &de, NULL);
3075 if (IS_ERR(bh))
3076 return PTR_ERR(bh);
3077 if (!bh)
3078 goto end_rmdir;
3079
3080 inode = d_inode(dentry);
3081
3082 retval = -EFSCORRUPTED;
3083 if (le32_to_cpu(de->inode) != inode->i_ino)
3084 goto end_rmdir;
3085
3086 retval = -ENOTEMPTY;
3087 if (!ext4_empty_dir(inode))
3088 goto end_rmdir;
3089
3090 handle = ext4_journal_start(dir, EXT4_HT_DIR,
3091 EXT4_DATA_TRANS_BLOCKS(dir->i_sb));
3092 if (IS_ERR(handle)) {
3093 retval = PTR_ERR(handle);
3094 handle = NULL;
3095 goto end_rmdir;
3096 }
3097
3098 if (IS_DIRSYNC(dir))
3099 ext4_handle_sync(handle);
3100
3101 retval = ext4_delete_entry(handle, dir, de, bh);
3102 if (retval)
3103 goto end_rmdir;
3104 if (!EXT4_DIR_LINK_EMPTY(inode))
3105 ext4_warning_inode(inode,
3106 "empty directory '%.*s' has too many links (%u)",
3107 dentry->d_name.len, dentry->d_name.name,
3108 inode->i_nlink);
3109 inode_inc_iversion(inode);
3110 clear_nlink(inode);
3111
3112
3113
3114 inode->i_size = 0;
3115 ext4_orphan_add(handle, inode);
3116 inode->i_ctime = dir->i_ctime = dir->i_mtime = current_time(inode);
3117 ext4_mark_inode_dirty(handle, inode);
3118 ext4_dec_count(handle, dir);
3119 ext4_update_dx_flag(dir);
3120 ext4_mark_inode_dirty(handle, dir);
3121
3122#ifdef CONFIG_UNICODE
3123
3124
3125
3126
3127
3128
3129 if (IS_CASEFOLDED(dir))
3130 d_invalidate(dentry);
3131#endif
3132
3133end_rmdir:
3134 brelse(bh);
3135 if (handle)
3136 ext4_journal_stop(handle);
3137 return retval;
3138}
3139
3140static int ext4_unlink(struct inode *dir, struct dentry *dentry)
3141{
3142 int retval;
3143 struct inode *inode;
3144 struct buffer_head *bh;
3145 struct ext4_dir_entry_2 *de;
3146 handle_t *handle = NULL;
3147
3148 if (unlikely(ext4_forced_shutdown(EXT4_SB(dir->i_sb))))
3149 return -EIO;
3150
3151 trace_ext4_unlink_enter(dir, dentry);
3152
3153
3154 retval = dquot_initialize(dir);
3155 if (retval)
3156 return retval;
3157 retval = dquot_initialize(d_inode(dentry));
3158 if (retval)
3159 return retval;
3160
3161 retval = -ENOENT;
3162 bh = ext4_find_entry(dir, &dentry->d_name, &de, NULL);
3163 if (IS_ERR(bh))
3164 return PTR_ERR(bh);
3165 if (!bh)
3166 goto end_unlink;
3167
3168 inode = d_inode(dentry);
3169
3170 retval = -EFSCORRUPTED;
3171 if (le32_to_cpu(de->inode) != inode->i_ino)
3172 goto end_unlink;
3173
3174 handle = ext4_journal_start(dir, EXT4_HT_DIR,
3175 EXT4_DATA_TRANS_BLOCKS(dir->i_sb));
3176 if (IS_ERR(handle)) {
3177 retval = PTR_ERR(handle);
3178 handle = NULL;
3179 goto end_unlink;
3180 }
3181
3182 if (IS_DIRSYNC(dir))
3183 ext4_handle_sync(handle);
3184
3185 if (inode->i_nlink == 0) {
3186 ext4_warning_inode(inode, "Deleting file '%.*s' with no links",
3187 dentry->d_name.len, dentry->d_name.name);
3188 set_nlink(inode, 1);
3189 }
3190 retval = ext4_delete_entry(handle, dir, de, bh);
3191 if (retval)
3192 goto end_unlink;
3193 dir->i_ctime = dir->i_mtime = current_time(dir);
3194 ext4_update_dx_flag(dir);
3195 ext4_mark_inode_dirty(handle, dir);
3196 drop_nlink(inode);
3197 if (!inode->i_nlink)
3198 ext4_orphan_add(handle, inode);
3199 inode->i_ctime = current_time(inode);
3200 ext4_mark_inode_dirty(handle, inode);
3201
3202#ifdef CONFIG_UNICODE
3203
3204
3205
3206
3207
3208
3209 if (IS_CASEFOLDED(dir))
3210 d_invalidate(dentry);
3211#endif
3212
3213end_unlink:
3214 brelse(bh);
3215 if (handle)
3216 ext4_journal_stop(handle);
3217 trace_ext4_unlink_exit(dentry, retval);
3218 return retval;
3219}
3220
3221static int ext4_symlink(struct inode *dir,
3222 struct dentry *dentry, const char *symname)
3223{
3224 handle_t *handle;
3225 struct inode *inode;
3226 int err, len = strlen(symname);
3227 int credits;
3228 struct fscrypt_str disk_link;
3229
3230 if (unlikely(ext4_forced_shutdown(EXT4_SB(dir->i_sb))))
3231 return -EIO;
3232
3233 err = fscrypt_prepare_symlink(dir, symname, len, dir->i_sb->s_blocksize,
3234 &disk_link);
3235 if (err)
3236 return err;
3237
3238 err = dquot_initialize(dir);
3239 if (err)
3240 return err;
3241
3242 if ((disk_link.len > EXT4_N_BLOCKS * 4)) {
3243
3244
3245
3246
3247
3248
3249 credits = 4 + EXT4_MAXQUOTAS_INIT_BLOCKS(dir->i_sb) +
3250 EXT4_XATTR_TRANS_BLOCKS;
3251 } else {
3252
3253
3254
3255
3256
3257
3258 credits = EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
3259 EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3;
3260 }
3261
3262 inode = ext4_new_inode_start_handle(dir, S_IFLNK|S_IRWXUGO,
3263 &dentry->d_name, 0, NULL,
3264 EXT4_HT_DIR, credits);
3265 handle = ext4_journal_current_handle();
3266 if (IS_ERR(inode)) {
3267 if (handle)
3268 ext4_journal_stop(handle);
3269 return PTR_ERR(inode);
3270 }
3271
3272 if (IS_ENCRYPTED(inode)) {
3273 err = fscrypt_encrypt_symlink(inode, symname, len, &disk_link);
3274 if (err)
3275 goto err_drop_inode;
3276 inode->i_op = &ext4_encrypted_symlink_inode_operations;
3277 }
3278
3279 if ((disk_link.len > EXT4_N_BLOCKS * 4)) {
3280 if (!IS_ENCRYPTED(inode))
3281 inode->i_op = &ext4_symlink_inode_operations;
3282 inode_nohighmem(inode);
3283 ext4_set_aops(inode);
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294 drop_nlink(inode);
3295 err = ext4_orphan_add(handle, inode);
3296 ext4_journal_stop(handle);
3297 handle = NULL;
3298 if (err)
3299 goto err_drop_inode;
3300 err = __page_symlink(inode, disk_link.name, disk_link.len, 1);
3301 if (err)
3302 goto err_drop_inode;
3303
3304
3305
3306
3307 handle = ext4_journal_start(dir, EXT4_HT_DIR,
3308 EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
3309 EXT4_INDEX_EXTRA_TRANS_BLOCKS + 1);
3310 if (IS_ERR(handle)) {
3311 err = PTR_ERR(handle);
3312 handle = NULL;
3313 goto err_drop_inode;
3314 }
3315 set_nlink(inode, 1);
3316 err = ext4_orphan_del(handle, inode);
3317 if (err)
3318 goto err_drop_inode;
3319 } else {
3320
3321 ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
3322 if (!IS_ENCRYPTED(inode)) {
3323 inode->i_op = &ext4_fast_symlink_inode_operations;
3324 inode->i_link = (char *)&EXT4_I(inode)->i_data;
3325 }
3326 memcpy((char *)&EXT4_I(inode)->i_data, disk_link.name,
3327 disk_link.len);
3328 inode->i_size = disk_link.len - 1;
3329 }
3330 EXT4_I(inode)->i_disksize = inode->i_size;
3331 err = ext4_add_nondir(handle, dentry, inode);
3332 if (!err && IS_DIRSYNC(dir))
3333 ext4_handle_sync(handle);
3334
3335 if (handle)
3336 ext4_journal_stop(handle);
3337 goto out_free_encrypted_link;
3338
3339err_drop_inode:
3340 if (handle)
3341 ext4_journal_stop(handle);
3342 clear_nlink(inode);
3343 unlock_new_inode(inode);
3344 iput(inode);
3345out_free_encrypted_link:
3346 if (disk_link.name != (unsigned char *)symname)
3347 kfree(disk_link.name);
3348 return err;
3349}
3350
3351static int ext4_link(struct dentry *old_dentry,
3352 struct inode *dir, struct dentry *dentry)
3353{
3354 handle_t *handle;
3355 struct inode *inode = d_inode(old_dentry);
3356 int err, retries = 0;
3357
3358 if (inode->i_nlink >= EXT4_LINK_MAX)
3359 return -EMLINK;
3360
3361 err = fscrypt_prepare_link(old_dentry, dir, dentry);
3362 if (err)
3363 return err;
3364
3365 if ((ext4_test_inode_flag(dir, EXT4_INODE_PROJINHERIT)) &&
3366 (!projid_eq(EXT4_I(dir)->i_projid,
3367 EXT4_I(old_dentry->d_inode)->i_projid)))
3368 return -EXDEV;
3369
3370 err = dquot_initialize(dir);
3371 if (err)
3372 return err;
3373
3374retry:
3375 handle = ext4_journal_start(dir, EXT4_HT_DIR,
3376 (EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
3377 EXT4_INDEX_EXTRA_TRANS_BLOCKS) + 1);
3378 if (IS_ERR(handle))
3379 return PTR_ERR(handle);
3380
3381 if (IS_DIRSYNC(dir))
3382 ext4_handle_sync(handle);
3383
3384 inode->i_ctime = current_time(inode);
3385 ext4_inc_count(handle, inode);
3386 ihold(inode);
3387
3388 err = ext4_add_entry(handle, dentry, inode);
3389 if (!err) {
3390 ext4_mark_inode_dirty(handle, inode);
3391
3392
3393
3394 if (inode->i_nlink == 1)
3395 ext4_orphan_del(handle, inode);
3396 d_instantiate(dentry, inode);
3397 } else {
3398 drop_nlink(inode);
3399 iput(inode);
3400 }
3401 ext4_journal_stop(handle);
3402 if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries))
3403 goto retry;
3404 return err;
3405}
3406
3407
3408
3409
3410
3411
3412
3413static struct buffer_head *ext4_get_first_dir_block(handle_t *handle,
3414 struct inode *inode,
3415 int *retval,
3416 struct ext4_dir_entry_2 **parent_de,
3417 int *inlined)
3418{
3419 struct buffer_head *bh;
3420
3421 if (!ext4_has_inline_data(inode)) {
3422
3423
3424
3425 bh = ext4_read_dirblock(inode, 0, DIRENT_HTREE);
3426 if (IS_ERR(bh)) {
3427 *retval = PTR_ERR(bh);
3428 return NULL;
3429 }
3430 *parent_de = ext4_next_entry(
3431 (struct ext4_dir_entry_2 *)bh->b_data,
3432 inode->i_sb->s_blocksize);
3433 return bh;
3434 }
3435
3436 *inlined = 1;
3437 return ext4_get_first_inline_block(inode, parent_de, retval);
3438}
3439
3440struct ext4_renament {
3441 struct inode *dir;
3442 struct dentry *dentry;
3443 struct inode *inode;
3444 bool is_dir;
3445 int dir_nlink_delta;
3446
3447
3448 struct buffer_head *bh;
3449 struct ext4_dir_entry_2 *de;
3450 int inlined;
3451
3452
3453 struct buffer_head *dir_bh;
3454 struct ext4_dir_entry_2 *parent_de;
3455 int dir_inlined;
3456};
3457
3458static int ext4_rename_dir_prepare(handle_t *handle, struct ext4_renament *ent)
3459{
3460 int retval;
3461
3462 ent->dir_bh = ext4_get_first_dir_block(handle, ent->inode,
3463 &retval, &ent->parent_de,
3464 &ent->dir_inlined);
3465 if (!ent->dir_bh)
3466 return retval;
3467 if (le32_to_cpu(ent->parent_de->inode) != ent->dir->i_ino)
3468 return -EFSCORRUPTED;
3469 BUFFER_TRACE(ent->dir_bh, "get_write_access");
3470 return ext4_journal_get_write_access(handle, ent->dir_bh);
3471}
3472
3473static int ext4_rename_dir_finish(handle_t *handle, struct ext4_renament *ent,
3474 unsigned dir_ino)
3475{
3476 int retval;
3477
3478 ent->parent_de->inode = cpu_to_le32(dir_ino);
3479 BUFFER_TRACE(ent->dir_bh, "call ext4_handle_dirty_metadata");
3480 if (!ent->dir_inlined) {
3481 if (is_dx(ent->inode)) {
3482 retval = ext4_handle_dirty_dx_node(handle,
3483 ent->inode,
3484 ent->dir_bh);
3485 } else {
3486 retval = ext4_handle_dirty_dirblock(handle, ent->inode,
3487 ent->dir_bh);
3488 }
3489 } else {
3490 retval = ext4_mark_inode_dirty(handle, ent->inode);
3491 }
3492 if (retval) {
3493 ext4_std_error(ent->dir->i_sb, retval);
3494 return retval;
3495 }
3496 return 0;
3497}
3498
3499static int ext4_setent(handle_t *handle, struct ext4_renament *ent,
3500 unsigned ino, unsigned file_type)
3501{
3502 int retval;
3503
3504 BUFFER_TRACE(ent->bh, "get write access");
3505 retval = ext4_journal_get_write_access(handle, ent->bh);
3506 if (retval)
3507 return retval;
3508 ent->de->inode = cpu_to_le32(ino);
3509 if (ext4_has_feature_filetype(ent->dir->i_sb))
3510 ent->de->file_type = file_type;
3511 inode_inc_iversion(ent->dir);
3512 ent->dir->i_ctime = ent->dir->i_mtime =
3513 current_time(ent->dir);
3514 ext4_mark_inode_dirty(handle, ent->dir);
3515 BUFFER_TRACE(ent->bh, "call ext4_handle_dirty_metadata");
3516 if (!ent->inlined) {
3517 retval = ext4_handle_dirty_dirblock(handle, ent->dir, ent->bh);
3518 if (unlikely(retval)) {
3519 ext4_std_error(ent->dir->i_sb, retval);
3520 return retval;
3521 }
3522 }
3523 brelse(ent->bh);
3524 ent->bh = NULL;
3525
3526 return 0;
3527}
3528
3529static int ext4_find_delete_entry(handle_t *handle, struct inode *dir,
3530 const struct qstr *d_name)
3531{
3532 int retval = -ENOENT;
3533 struct buffer_head *bh;
3534 struct ext4_dir_entry_2 *de;
3535
3536 bh = ext4_find_entry(dir, d_name, &de, NULL);
3537 if (IS_ERR(bh))
3538 return PTR_ERR(bh);
3539 if (bh) {
3540 retval = ext4_delete_entry(handle, dir, de, bh);
3541 brelse(bh);
3542 }
3543 return retval;
3544}
3545
3546static void ext4_rename_delete(handle_t *handle, struct ext4_renament *ent,
3547 int force_reread)
3548{
3549 int retval;
3550
3551
3552
3553
3554
3555
3556 if (le32_to_cpu(ent->de->inode) != ent->inode->i_ino ||
3557 ent->de->name_len != ent->dentry->d_name.len ||
3558 strncmp(ent->de->name, ent->dentry->d_name.name,
3559 ent->de->name_len) ||
3560 force_reread) {
3561 retval = ext4_find_delete_entry(handle, ent->dir,
3562 &ent->dentry->d_name);
3563 } else {
3564 retval = ext4_delete_entry(handle, ent->dir, ent->de, ent->bh);
3565 if (retval == -ENOENT) {
3566 retval = ext4_find_delete_entry(handle, ent->dir,
3567 &ent->dentry->d_name);
3568 }
3569 }
3570
3571 if (retval) {
3572 ext4_warning_inode(ent->dir,
3573 "Deleting old file: nlink %d, error=%d",
3574 ent->dir->i_nlink, retval);
3575 }
3576}
3577
3578static void ext4_update_dir_count(handle_t *handle, struct ext4_renament *ent)
3579{
3580 if (ent->dir_nlink_delta) {
3581 if (ent->dir_nlink_delta == -1)
3582 ext4_dec_count(handle, ent->dir);
3583 else
3584 ext4_inc_count(handle, ent->dir);
3585 ext4_mark_inode_dirty(handle, ent->dir);
3586 }
3587}
3588
3589static struct inode *ext4_whiteout_for_rename(struct ext4_renament *ent,
3590 int credits, handle_t **h)
3591{
3592 struct inode *wh;
3593 handle_t *handle;
3594 int retries = 0;
3595
3596
3597
3598
3599
3600 credits += (EXT4_MAXQUOTAS_TRANS_BLOCKS(ent->dir->i_sb) +
3601 EXT4_XATTR_TRANS_BLOCKS + 4);
3602retry:
3603 wh = ext4_new_inode_start_handle(ent->dir, S_IFCHR | WHITEOUT_MODE,
3604 &ent->dentry->d_name, 0, NULL,
3605 EXT4_HT_DIR, credits);
3606
3607 handle = ext4_journal_current_handle();
3608 if (IS_ERR(wh)) {
3609 if (handle)
3610 ext4_journal_stop(handle);
3611 if (PTR_ERR(wh) == -ENOSPC &&
3612 ext4_should_retry_alloc(ent->dir->i_sb, &retries))
3613 goto retry;
3614 } else {
3615 *h = handle;
3616 init_special_inode(wh, wh->i_mode, WHITEOUT_DEV);
3617 wh->i_op = &ext4_special_inode_operations;
3618 }
3619 return wh;
3620}
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
3631 struct inode *new_dir, struct dentry *new_dentry,
3632 unsigned int flags)
3633{
3634 handle_t *handle = NULL;
3635 struct ext4_renament old = {
3636 .dir = old_dir,
3637 .dentry = old_dentry,
3638 .inode = d_inode(old_dentry),
3639 };
3640 struct ext4_renament new = {
3641 .dir = new_dir,
3642 .dentry = new_dentry,
3643 .inode = d_inode(new_dentry),
3644 };
3645 int force_reread;
3646 int retval;
3647 struct inode *whiteout = NULL;
3648 int credits;
3649 u8 old_file_type;
3650
3651 if (new.inode && new.inode->i_nlink == 0) {
3652 EXT4_ERROR_INODE(new.inode,
3653 "target of rename is already freed");
3654 return -EFSCORRUPTED;
3655 }
3656
3657 if ((ext4_test_inode_flag(new_dir, EXT4_INODE_PROJINHERIT)) &&
3658 (!projid_eq(EXT4_I(new_dir)->i_projid,
3659 EXT4_I(old_dentry->d_inode)->i_projid)))
3660 return -EXDEV;
3661
3662 retval = dquot_initialize(old.dir);
3663 if (retval)
3664 return retval;
3665 retval = dquot_initialize(new.dir);
3666 if (retval)
3667 return retval;
3668
3669
3670
3671 if (new.inode) {
3672 retval = dquot_initialize(new.inode);
3673 if (retval)
3674 return retval;
3675 }
3676
3677 old.bh = ext4_find_entry(old.dir, &old.dentry->d_name, &old.de, NULL);
3678 if (IS_ERR(old.bh))
3679 return PTR_ERR(old.bh);
3680
3681
3682
3683
3684
3685
3686 retval = -ENOENT;
3687 if (!old.bh || le32_to_cpu(old.de->inode) != old.inode->i_ino)
3688 goto end_rename;
3689
3690 new.bh = ext4_find_entry(new.dir, &new.dentry->d_name,
3691 &new.de, &new.inlined);
3692 if (IS_ERR(new.bh)) {
3693 retval = PTR_ERR(new.bh);
3694 new.bh = NULL;
3695 goto end_rename;
3696 }
3697 if (new.bh) {
3698 if (!new.inode) {
3699 brelse(new.bh);
3700 new.bh = NULL;
3701 }
3702 }
3703 if (new.inode && !test_opt(new.dir->i_sb, NO_AUTO_DA_ALLOC))
3704 ext4_alloc_da_blocks(old.inode);
3705
3706 credits = (2 * EXT4_DATA_TRANS_BLOCKS(old.dir->i_sb) +
3707 EXT4_INDEX_EXTRA_TRANS_BLOCKS + 2);
3708 if (!(flags & RENAME_WHITEOUT)) {
3709 handle = ext4_journal_start(old.dir, EXT4_HT_DIR, credits);
3710 if (IS_ERR(handle)) {
3711 retval = PTR_ERR(handle);
3712 handle = NULL;
3713 goto end_rename;
3714 }
3715 } else {
3716 whiteout = ext4_whiteout_for_rename(&old, credits, &handle);
3717 if (IS_ERR(whiteout)) {
3718 retval = PTR_ERR(whiteout);
3719 whiteout = NULL;
3720 goto end_rename;
3721 }
3722 }
3723
3724 if (IS_DIRSYNC(old.dir) || IS_DIRSYNC(new.dir))
3725 ext4_handle_sync(handle);
3726
3727 if (S_ISDIR(old.inode->i_mode)) {
3728 if (new.inode) {
3729 retval = -ENOTEMPTY;
3730 if (!ext4_empty_dir(new.inode))
3731 goto end_rename;
3732 } else {
3733 retval = -EMLINK;
3734 if (new.dir != old.dir && EXT4_DIR_LINK_MAX(new.dir))
3735 goto end_rename;
3736 }
3737 retval = ext4_rename_dir_prepare(handle, &old);
3738 if (retval)
3739 goto end_rename;
3740 }
3741
3742
3743
3744
3745
3746
3747
3748 force_reread = (new.dir->i_ino == old.dir->i_ino &&
3749 ext4_test_inode_flag(new.dir, EXT4_INODE_INLINE_DATA));
3750
3751 old_file_type = old.de->file_type;
3752 if (whiteout) {
3753
3754
3755
3756
3757 retval = ext4_setent(handle, &old, whiteout->i_ino,
3758 EXT4_FT_CHRDEV);
3759 if (retval)
3760 goto end_rename;
3761 ext4_mark_inode_dirty(handle, whiteout);
3762 }
3763 if (!new.bh) {
3764 retval = ext4_add_entry(handle, new.dentry, old.inode);
3765 if (retval)
3766 goto end_rename;
3767 } else {
3768 retval = ext4_setent(handle, &new,
3769 old.inode->i_ino, old_file_type);
3770 if (retval)
3771 goto end_rename;
3772 }
3773 if (force_reread)
3774 force_reread = !ext4_test_inode_flag(new.dir,
3775 EXT4_INODE_INLINE_DATA);
3776
3777
3778
3779
3780
3781 old.inode->i_ctime = current_time(old.inode);
3782 ext4_mark_inode_dirty(handle, old.inode);
3783
3784 if (!whiteout) {
3785
3786
3787
3788 ext4_rename_delete(handle, &old, force_reread);
3789 }
3790
3791 if (new.inode) {
3792 ext4_dec_count(handle, new.inode);
3793 new.inode->i_ctime = current_time(new.inode);
3794 }
3795 old.dir->i_ctime = old.dir->i_mtime = current_time(old.dir);
3796 ext4_update_dx_flag(old.dir);
3797 if (old.dir_bh) {
3798 retval = ext4_rename_dir_finish(handle, &old, new.dir->i_ino);
3799 if (retval)
3800 goto end_rename;
3801
3802 ext4_dec_count(handle, old.dir);
3803 if (new.inode) {
3804
3805
3806
3807 clear_nlink(new.inode);
3808 } else {
3809 ext4_inc_count(handle, new.dir);
3810 ext4_update_dx_flag(new.dir);
3811 ext4_mark_inode_dirty(handle, new.dir);
3812 }
3813 }
3814 ext4_mark_inode_dirty(handle, old.dir);
3815 if (new.inode) {
3816 ext4_mark_inode_dirty(handle, new.inode);
3817 if (!new.inode->i_nlink)
3818 ext4_orphan_add(handle, new.inode);
3819 }
3820 retval = 0;
3821
3822end_rename:
3823 brelse(old.dir_bh);
3824 brelse(old.bh);
3825 brelse(new.bh);
3826 if (whiteout) {
3827 if (retval)
3828 drop_nlink(whiteout);
3829 unlock_new_inode(whiteout);
3830 iput(whiteout);
3831 }
3832 if (handle)
3833 ext4_journal_stop(handle);
3834 return retval;
3835}
3836
3837static int ext4_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
3838 struct inode *new_dir, struct dentry *new_dentry)
3839{
3840 handle_t *handle = NULL;
3841 struct ext4_renament old = {
3842 .dir = old_dir,
3843 .dentry = old_dentry,
3844 .inode = d_inode(old_dentry),
3845 };
3846 struct ext4_renament new = {
3847 .dir = new_dir,
3848 .dentry = new_dentry,
3849 .inode = d_inode(new_dentry),
3850 };
3851 u8 new_file_type;
3852 int retval;
3853 struct timespec64 ctime;
3854
3855 if ((ext4_test_inode_flag(new_dir, EXT4_INODE_PROJINHERIT) &&
3856 !projid_eq(EXT4_I(new_dir)->i_projid,
3857 EXT4_I(old_dentry->d_inode)->i_projid)) ||
3858 (ext4_test_inode_flag(old_dir, EXT4_INODE_PROJINHERIT) &&
3859 !projid_eq(EXT4_I(old_dir)->i_projid,
3860 EXT4_I(new_dentry->d_inode)->i_projid)))
3861 return -EXDEV;
3862
3863 retval = dquot_initialize(old.dir);
3864 if (retval)
3865 return retval;
3866 retval = dquot_initialize(new.dir);
3867 if (retval)
3868 return retval;
3869
3870 old.bh = ext4_find_entry(old.dir, &old.dentry->d_name,
3871 &old.de, &old.inlined);
3872 if (IS_ERR(old.bh))
3873 return PTR_ERR(old.bh);
3874
3875
3876
3877
3878
3879
3880 retval = -ENOENT;
3881 if (!old.bh || le32_to_cpu(old.de->inode) != old.inode->i_ino)
3882 goto end_rename;
3883
3884 new.bh = ext4_find_entry(new.dir, &new.dentry->d_name,
3885 &new.de, &new.inlined);
3886 if (IS_ERR(new.bh)) {
3887 retval = PTR_ERR(new.bh);
3888 new.bh = NULL;
3889 goto end_rename;
3890 }
3891
3892
3893 if (!new.bh || le32_to_cpu(new.de->inode) != new.inode->i_ino)
3894 goto end_rename;
3895
3896 handle = ext4_journal_start(old.dir, EXT4_HT_DIR,
3897 (2 * EXT4_DATA_TRANS_BLOCKS(old.dir->i_sb) +
3898 2 * EXT4_INDEX_EXTRA_TRANS_BLOCKS + 2));
3899 if (IS_ERR(handle)) {
3900 retval = PTR_ERR(handle);
3901 handle = NULL;
3902 goto end_rename;
3903 }
3904
3905 if (IS_DIRSYNC(old.dir) || IS_DIRSYNC(new.dir))
3906 ext4_handle_sync(handle);
3907
3908 if (S_ISDIR(old.inode->i_mode)) {
3909 old.is_dir = true;
3910 retval = ext4_rename_dir_prepare(handle, &old);
3911 if (retval)
3912 goto end_rename;
3913 }
3914 if (S_ISDIR(new.inode->i_mode)) {
3915 new.is_dir = true;
3916 retval = ext4_rename_dir_prepare(handle, &new);
3917 if (retval)
3918 goto end_rename;
3919 }
3920
3921
3922
3923
3924
3925 if (old.dir != new.dir && old.is_dir != new.is_dir) {
3926 old.dir_nlink_delta = old.is_dir ? -1 : 1;
3927 new.dir_nlink_delta = -old.dir_nlink_delta;
3928 retval = -EMLINK;
3929 if ((old.dir_nlink_delta > 0 && EXT4_DIR_LINK_MAX(old.dir)) ||
3930 (new.dir_nlink_delta > 0 && EXT4_DIR_LINK_MAX(new.dir)))
3931 goto end_rename;
3932 }
3933
3934 new_file_type = new.de->file_type;
3935 retval = ext4_setent(handle, &new, old.inode->i_ino, old.de->file_type);
3936 if (retval)
3937 goto end_rename;
3938
3939 retval = ext4_setent(handle, &old, new.inode->i_ino, new_file_type);
3940 if (retval)
3941 goto end_rename;
3942
3943
3944
3945
3946
3947 ctime = current_time(old.inode);
3948 old.inode->i_ctime = ctime;
3949 new.inode->i_ctime = ctime;
3950 ext4_mark_inode_dirty(handle, old.inode);
3951 ext4_mark_inode_dirty(handle, new.inode);
3952
3953 if (old.dir_bh) {
3954 retval = ext4_rename_dir_finish(handle, &old, new.dir->i_ino);
3955 if (retval)
3956 goto end_rename;
3957 }
3958 if (new.dir_bh) {
3959 retval = ext4_rename_dir_finish(handle, &new, old.dir->i_ino);
3960 if (retval)
3961 goto end_rename;
3962 }
3963 ext4_update_dir_count(handle, &old);
3964 ext4_update_dir_count(handle, &new);
3965 retval = 0;
3966
3967end_rename:
3968 brelse(old.dir_bh);
3969 brelse(new.dir_bh);
3970 brelse(old.bh);
3971 brelse(new.bh);
3972 if (handle)
3973 ext4_journal_stop(handle);
3974 return retval;
3975}
3976
3977static int ext4_rename2(struct inode *old_dir, struct dentry *old_dentry,
3978 struct inode *new_dir, struct dentry *new_dentry,
3979 unsigned int flags)
3980{
3981 int err;
3982
3983 if (unlikely(ext4_forced_shutdown(EXT4_SB(old_dir->i_sb))))
3984 return -EIO;
3985
3986 if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
3987 return -EINVAL;
3988
3989 err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry,
3990 flags);
3991 if (err)
3992 return err;
3993
3994 if (flags & RENAME_EXCHANGE) {
3995 return ext4_cross_rename(old_dir, old_dentry,
3996 new_dir, new_dentry);
3997 }
3998
3999 return ext4_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
4000}
4001
4002
4003
4004
4005const struct inode_operations ext4_dir_inode_operations = {
4006 .create = ext4_create,
4007 .lookup = ext4_lookup,
4008 .link = ext4_link,
4009 .unlink = ext4_unlink,
4010 .symlink = ext4_symlink,
4011 .mkdir = ext4_mkdir,
4012 .rmdir = ext4_rmdir,
4013 .mknod = ext4_mknod,
4014 .tmpfile = ext4_tmpfile,
4015 .rename = ext4_rename2,
4016 .setattr = ext4_setattr,
4017 .getattr = ext4_getattr,
4018 .listxattr = ext4_listxattr,
4019 .get_acl = ext4_get_acl,
4020 .set_acl = ext4_set_acl,
4021 .fiemap = ext4_fiemap,
4022};
4023
4024const struct inode_operations ext4_special_inode_operations = {
4025 .setattr = ext4_setattr,
4026 .getattr = ext4_getattr,
4027 .listxattr = ext4_listxattr,
4028 .get_acl = ext4_get_acl,
4029 .set_acl = ext4_set_acl,
4030};
4031