4 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
5 * http://www.samsung.com/
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 #include <linux/f2fs_fs.h>
18 static unsigned long dir_blocks(struct inode
*inode
)
20 return ((unsigned long long) (i_size_read(inode
) + PAGE_CACHE_SIZE
- 1))
24 static unsigned int dir_buckets(unsigned int level
, int dir_level
)
26 if (level
+ dir_level
< MAX_DIR_HASH_DEPTH
/ 2)
27 return 1 << (level
+ dir_level
);
29 return MAX_DIR_BUCKETS
;
32 static unsigned int bucket_blocks(unsigned int level
)
34 if (level
< MAX_DIR_HASH_DEPTH
/ 2)
40 static unsigned char f2fs_filetype_table
[F2FS_FT_MAX
] = {
41 [F2FS_FT_UNKNOWN
] = DT_UNKNOWN
,
42 [F2FS_FT_REG_FILE
] = DT_REG
,
43 [F2FS_FT_DIR
] = DT_DIR
,
44 [F2FS_FT_CHRDEV
] = DT_CHR
,
45 [F2FS_FT_BLKDEV
] = DT_BLK
,
46 [F2FS_FT_FIFO
] = DT_FIFO
,
47 [F2FS_FT_SOCK
] = DT_SOCK
,
48 [F2FS_FT_SYMLINK
] = DT_LNK
,
52 static unsigned char f2fs_type_by_mode
[S_IFMT
>> S_SHIFT
] = {
53 [S_IFREG
>> S_SHIFT
] = F2FS_FT_REG_FILE
,
54 [S_IFDIR
>> S_SHIFT
] = F2FS_FT_DIR
,
55 [S_IFCHR
>> S_SHIFT
] = F2FS_FT_CHRDEV
,
56 [S_IFBLK
>> S_SHIFT
] = F2FS_FT_BLKDEV
,
57 [S_IFIFO
>> S_SHIFT
] = F2FS_FT_FIFO
,
58 [S_IFSOCK
>> S_SHIFT
] = F2FS_FT_SOCK
,
59 [S_IFLNK
>> S_SHIFT
] = F2FS_FT_SYMLINK
,
62 static void set_de_type(struct f2fs_dir_entry
*de
, struct inode
*inode
)
64 umode_t mode
= inode
->i_mode
;
65 de
->file_type
= f2fs_type_by_mode
[(mode
& S_IFMT
) >> S_SHIFT
];
68 static unsigned long dir_block_index(unsigned int level
,
69 int dir_level
, unsigned int idx
)
72 unsigned long bidx
= 0;
74 for (i
= 0; i
< level
; i
++)
75 bidx
+= dir_buckets(i
, dir_level
) * bucket_blocks(i
);
76 bidx
+= idx
* bucket_blocks(level
);
80 static bool early_match_name(size_t namelen
, f2fs_hash_t namehash
,
81 struct f2fs_dir_entry
*de
)
83 if (le16_to_cpu(de
->name_len
) != namelen
)
86 if (de
->hash_code
!= namehash
)
92 static struct f2fs_dir_entry
*find_in_block(struct page
*dentry_page
,
93 struct qstr
*name
, int *max_slots
,
94 f2fs_hash_t namehash
, struct page
**res_page
)
96 struct f2fs_dir_entry
*de
;
97 unsigned long bit_pos
= 0;
98 struct f2fs_dentry_block
*dentry_blk
= kmap(dentry_page
);
99 const void *dentry_bits
= &dentry_blk
->dentry_bitmap
;
102 while (bit_pos
< NR_DENTRY_IN_BLOCK
) {
103 if (!test_bit_le(bit_pos
, dentry_bits
)) {
106 else if (!test_bit_le(bit_pos
- 1, dentry_bits
))
111 de
= &dentry_blk
->dentry
[bit_pos
];
112 if (early_match_name(name
->len
, namehash
, de
)) {
113 if (!memcmp(dentry_blk
->filename
[bit_pos
],
116 *res_page
= dentry_page
;
120 if (max_len
> *max_slots
) {
121 *max_slots
= max_len
;
126 * For the most part, it should be a bug when name_len is zero.
127 * We stop here for figuring out where the bugs has occurred.
129 f2fs_bug_on(F2FS_P_SB(dentry_page
), !de
->name_len
);
131 bit_pos
+= GET_DENTRY_SLOTS(le16_to_cpu(de
->name_len
));
137 if (max_len
> *max_slots
)
138 *max_slots
= max_len
;
142 static struct f2fs_dir_entry
*find_in_level(struct inode
*dir
,
143 unsigned int level
, struct qstr
*name
,
144 f2fs_hash_t namehash
, struct page
**res_page
)
146 int s
= GET_DENTRY_SLOTS(name
->len
);
147 unsigned int nbucket
, nblock
;
148 unsigned int bidx
, end_block
;
149 struct page
*dentry_page
;
150 struct f2fs_dir_entry
*de
= NULL
;
154 f2fs_bug_on(F2FS_I_SB(dir
), level
> MAX_DIR_HASH_DEPTH
);
156 nbucket
= dir_buckets(level
, F2FS_I(dir
)->i_dir_level
);
157 nblock
= bucket_blocks(level
);
159 bidx
= dir_block_index(level
, F2FS_I(dir
)->i_dir_level
,
160 le32_to_cpu(namehash
) % nbucket
);
161 end_block
= bidx
+ nblock
;
163 for (; bidx
< end_block
; bidx
++) {
164 /* no need to allocate new dentry pages to all the indices */
165 dentry_page
= find_data_page(dir
, bidx
, true);
166 if (IS_ERR(dentry_page
)) {
171 de
= find_in_block(dentry_page
, name
, &max_slots
,
178 f2fs_put_page(dentry_page
, 0);
181 if (!de
&& room
&& F2FS_I(dir
)->chash
!= namehash
) {
182 F2FS_I(dir
)->chash
= namehash
;
183 F2FS_I(dir
)->clevel
= level
;
190 * Find an entry in the specified directory with the wanted name.
191 * It returns the page where the entry was found (as a parameter - res_page),
192 * and the entry itself. Page is returned mapped and unlocked.
193 * Entry is guaranteed to be valid.
195 struct f2fs_dir_entry
*f2fs_find_entry(struct inode
*dir
,
196 struct qstr
*child
, struct page
**res_page
)
198 unsigned long npages
= dir_blocks(dir
);
199 struct f2fs_dir_entry
*de
= NULL
;
200 f2fs_hash_t name_hash
;
201 unsigned int max_depth
;
209 name_hash
= f2fs_dentry_hash(child
);
210 max_depth
= F2FS_I(dir
)->i_current_depth
;
212 for (level
= 0; level
< max_depth
; level
++) {
213 de
= find_in_level(dir
, level
, child
, name_hash
, res_page
);
217 if (!de
&& F2FS_I(dir
)->chash
!= name_hash
) {
218 F2FS_I(dir
)->chash
= name_hash
;
219 F2FS_I(dir
)->clevel
= level
- 1;
224 struct f2fs_dir_entry
*f2fs_parent_dir(struct inode
*dir
, struct page
**p
)
227 struct f2fs_dir_entry
*de
;
228 struct f2fs_dentry_block
*dentry_blk
;
230 page
= get_lock_data_page(dir
, 0);
234 dentry_blk
= kmap(page
);
235 de
= &dentry_blk
->dentry
[1];
241 ino_t
f2fs_inode_by_name(struct inode
*dir
, struct qstr
*qstr
)
244 struct f2fs_dir_entry
*de
;
247 de
= f2fs_find_entry(dir
, qstr
, &page
);
249 res
= le32_to_cpu(de
->ino
);
251 f2fs_put_page(page
, 0);
257 void f2fs_set_link(struct inode
*dir
, struct f2fs_dir_entry
*de
,
258 struct page
*page
, struct inode
*inode
)
261 f2fs_wait_on_page_writeback(page
, DATA
);
262 de
->ino
= cpu_to_le32(inode
->i_ino
);
263 set_de_type(de
, inode
);
265 set_page_dirty(page
);
266 dir
->i_mtime
= dir
->i_ctime
= CURRENT_TIME
;
267 mark_inode_dirty(dir
);
269 f2fs_put_page(page
, 1);
272 static void init_dent_inode(const struct qstr
*name
, struct page
*ipage
)
274 struct f2fs_inode
*ri
;
276 f2fs_wait_on_page_writeback(ipage
, NODE
);
278 /* copy name info. to this inode page */
279 ri
= F2FS_INODE(ipage
);
280 ri
->i_namelen
= cpu_to_le32(name
->len
);
281 memcpy(ri
->i_name
, name
->name
, name
->len
);
282 set_page_dirty(ipage
);
285 int update_dent_inode(struct inode
*inode
, const struct qstr
*name
)
289 page
= get_node_page(F2FS_I_SB(inode
), inode
->i_ino
);
291 return PTR_ERR(page
);
293 init_dent_inode(name
, page
);
294 f2fs_put_page(page
, 1);
299 static int make_empty_dir(struct inode
*inode
,
300 struct inode
*parent
, struct page
*page
)
302 struct page
*dentry_page
;
303 struct f2fs_dentry_block
*dentry_blk
;
304 struct f2fs_dir_entry
*de
;
306 dentry_page
= get_new_data_page(inode
, page
, 0, true);
307 if (IS_ERR(dentry_page
))
308 return PTR_ERR(dentry_page
);
311 dentry_blk
= kmap_atomic(dentry_page
);
313 de
= &dentry_blk
->dentry
[0];
314 de
->name_len
= cpu_to_le16(1);
316 de
->ino
= cpu_to_le32(inode
->i_ino
);
317 memcpy(dentry_blk
->filename
[0], ".", 1);
318 set_de_type(de
, inode
);
320 de
= &dentry_blk
->dentry
[1];
322 de
->name_len
= cpu_to_le16(2);
323 de
->ino
= cpu_to_le32(parent
->i_ino
);
324 memcpy(dentry_blk
->filename
[1], "..", 2);
325 set_de_type(de
, inode
);
327 test_and_set_bit_le(0, &dentry_blk
->dentry_bitmap
);
328 test_and_set_bit_le(1, &dentry_blk
->dentry_bitmap
);
329 kunmap_atomic(dentry_blk
);
331 set_page_dirty(dentry_page
);
332 f2fs_put_page(dentry_page
, 1);
336 static struct page
*init_inode_metadata(struct inode
*inode
,
337 struct inode
*dir
, const struct qstr
*name
)
342 if (is_inode_flag_set(F2FS_I(inode
), FI_NEW_INODE
)) {
343 page
= new_inode_page(inode
);
347 if (S_ISDIR(inode
->i_mode
)) {
348 err
= make_empty_dir(inode
, dir
, page
);
353 err
= f2fs_init_acl(inode
, dir
, page
);
357 err
= f2fs_init_security(inode
, dir
, name
, page
);
361 page
= get_node_page(F2FS_I_SB(dir
), inode
->i_ino
);
365 set_cold_node(inode
, page
);
369 init_dent_inode(name
, page
);
372 * This file should be checkpointed during fsync.
373 * We lost i_pino from now on.
375 if (is_inode_flag_set(F2FS_I(inode
), FI_INC_LINK
)) {
376 file_lost_pino(inode
);
378 * If link the tmpfile to alias through linkat path,
379 * we should remove this inode from orphan list.
381 if (inode
->i_nlink
== 0)
382 remove_orphan_inode(F2FS_I_SB(dir
), inode
->i_ino
);
388 f2fs_put_page(page
, 1);
390 /* once the failed inode becomes a bad inode, i_mode is S_IFREG */
391 truncate_inode_pages(&inode
->i_data
, 0);
392 truncate_blocks(inode
, 0, false);
393 remove_dirty_dir_inode(inode
);
394 remove_inode_page(inode
);
398 static void update_parent_metadata(struct inode
*dir
, struct inode
*inode
,
399 unsigned int current_depth
)
401 if (is_inode_flag_set(F2FS_I(inode
), FI_NEW_INODE
)) {
402 if (S_ISDIR(inode
->i_mode
)) {
404 set_inode_flag(F2FS_I(dir
), FI_UPDATE_DIR
);
406 clear_inode_flag(F2FS_I(inode
), FI_NEW_INODE
);
408 dir
->i_mtime
= dir
->i_ctime
= CURRENT_TIME
;
409 mark_inode_dirty(dir
);
411 if (F2FS_I(dir
)->i_current_depth
!= current_depth
) {
412 F2FS_I(dir
)->i_current_depth
= current_depth
;
413 set_inode_flag(F2FS_I(dir
), FI_UPDATE_DIR
);
416 if (is_inode_flag_set(F2FS_I(inode
), FI_INC_LINK
))
417 clear_inode_flag(F2FS_I(inode
), FI_INC_LINK
);
420 static int room_for_filename(struct f2fs_dentry_block
*dentry_blk
, int slots
)
423 int zero_start
, zero_end
;
425 zero_start
= find_next_zero_bit_le(&dentry_blk
->dentry_bitmap
,
428 if (zero_start
>= NR_DENTRY_IN_BLOCK
)
429 return NR_DENTRY_IN_BLOCK
;
431 zero_end
= find_next_bit_le(&dentry_blk
->dentry_bitmap
,
434 if (zero_end
- zero_start
>= slots
)
437 bit_start
= zero_end
+ 1;
439 if (zero_end
+ 1 >= NR_DENTRY_IN_BLOCK
)
440 return NR_DENTRY_IN_BLOCK
;
445 * Caller should grab and release a rwsem by calling f2fs_lock_op() and
448 int __f2fs_add_link(struct inode
*dir
, const struct qstr
*name
,
451 unsigned int bit_pos
;
453 unsigned int current_depth
;
454 unsigned long bidx
, block
;
455 f2fs_hash_t dentry_hash
;
456 struct f2fs_dir_entry
*de
;
457 unsigned int nbucket
, nblock
;
458 size_t namelen
= name
->len
;
459 struct page
*dentry_page
= NULL
;
460 struct f2fs_dentry_block
*dentry_blk
= NULL
;
461 int slots
= GET_DENTRY_SLOTS(namelen
);
466 dentry_hash
= f2fs_dentry_hash(name
);
468 current_depth
= F2FS_I(dir
)->i_current_depth
;
469 if (F2FS_I(dir
)->chash
== dentry_hash
) {
470 level
= F2FS_I(dir
)->clevel
;
471 F2FS_I(dir
)->chash
= 0;
475 if (unlikely(current_depth
== MAX_DIR_HASH_DEPTH
))
478 /* Increase the depth, if required */
479 if (level
== current_depth
)
482 nbucket
= dir_buckets(level
, F2FS_I(dir
)->i_dir_level
);
483 nblock
= bucket_blocks(level
);
485 bidx
= dir_block_index(level
, F2FS_I(dir
)->i_dir_level
,
486 (le32_to_cpu(dentry_hash
) % nbucket
));
488 for (block
= bidx
; block
<= (bidx
+ nblock
- 1); block
++) {
489 dentry_page
= get_new_data_page(dir
, NULL
, block
, true);
490 if (IS_ERR(dentry_page
))
491 return PTR_ERR(dentry_page
);
493 dentry_blk
= kmap(dentry_page
);
494 bit_pos
= room_for_filename(dentry_blk
, slots
);
495 if (bit_pos
< NR_DENTRY_IN_BLOCK
)
499 f2fs_put_page(dentry_page
, 1);
502 /* Move to next level to find the empty slot for new dentry */
506 f2fs_wait_on_page_writeback(dentry_page
, DATA
);
508 down_write(&F2FS_I(inode
)->i_sem
);
509 page
= init_inode_metadata(inode
, dir
, name
);
514 de
= &dentry_blk
->dentry
[bit_pos
];
515 de
->hash_code
= dentry_hash
;
516 de
->name_len
= cpu_to_le16(namelen
);
517 memcpy(dentry_blk
->filename
[bit_pos
], name
->name
, name
->len
);
518 de
->ino
= cpu_to_le32(inode
->i_ino
);
519 set_de_type(de
, inode
);
520 for (i
= 0; i
< slots
; i
++)
521 test_and_set_bit_le(bit_pos
+ i
, &dentry_blk
->dentry_bitmap
);
522 set_page_dirty(dentry_page
);
524 /* we don't need to mark_inode_dirty now */
525 F2FS_I(inode
)->i_pino
= dir
->i_ino
;
526 update_inode(inode
, page
);
527 f2fs_put_page(page
, 1);
529 update_parent_metadata(dir
, inode
, current_depth
);
531 up_write(&F2FS_I(inode
)->i_sem
);
533 if (is_inode_flag_set(F2FS_I(dir
), FI_UPDATE_DIR
)) {
534 update_inode_page(dir
);
535 clear_inode_flag(F2FS_I(dir
), FI_UPDATE_DIR
);
538 f2fs_put_page(dentry_page
, 1);
542 int f2fs_do_tmpfile(struct inode
*inode
, struct inode
*dir
)
547 down_write(&F2FS_I(inode
)->i_sem
);
548 page
= init_inode_metadata(inode
, dir
, NULL
);
553 /* we don't need to mark_inode_dirty now */
554 update_inode(inode
, page
);
555 f2fs_put_page(page
, 1);
557 clear_inode_flag(F2FS_I(inode
), FI_NEW_INODE
);
559 up_write(&F2FS_I(inode
)->i_sem
);
564 * It only removes the dentry from the dentry page, corresponding name
565 * entry in name page does not need to be touched during deletion.
567 void f2fs_delete_entry(struct f2fs_dir_entry
*dentry
, struct page
*page
,
570 struct f2fs_dentry_block
*dentry_blk
;
571 unsigned int bit_pos
;
572 struct inode
*dir
= page
->mapping
->host
;
573 int slots
= GET_DENTRY_SLOTS(le16_to_cpu(dentry
->name_len
));
577 f2fs_wait_on_page_writeback(page
, DATA
);
579 dentry_blk
= page_address(page
);
580 bit_pos
= dentry
- dentry_blk
->dentry
;
581 for (i
= 0; i
< slots
; i
++)
582 test_and_clear_bit_le(bit_pos
+ i
, &dentry_blk
->dentry_bitmap
);
584 /* Let's check and deallocate this dentry page */
585 bit_pos
= find_next_bit_le(&dentry_blk
->dentry_bitmap
,
588 kunmap(page
); /* kunmap - pair of f2fs_find_entry */
589 set_page_dirty(page
);
591 dir
->i_ctime
= dir
->i_mtime
= CURRENT_TIME
;
594 struct f2fs_sb_info
*sbi
= F2FS_I_SB(dir
);
596 down_write(&F2FS_I(inode
)->i_sem
);
598 if (S_ISDIR(inode
->i_mode
)) {
600 update_inode_page(dir
);
602 inode
->i_ctime
= CURRENT_TIME
;
604 if (S_ISDIR(inode
->i_mode
)) {
606 i_size_write(inode
, 0);
608 up_write(&F2FS_I(inode
)->i_sem
);
609 update_inode_page(inode
);
611 if (inode
->i_nlink
== 0)
612 add_orphan_inode(sbi
, inode
->i_ino
);
614 release_orphan_inode(sbi
);
617 if (bit_pos
== NR_DENTRY_IN_BLOCK
) {
618 truncate_hole(dir
, page
->index
, page
->index
+ 1);
619 clear_page_dirty_for_io(page
);
620 ClearPageUptodate(page
);
621 inode_dec_dirty_pages(dir
);
623 f2fs_put_page(page
, 1);
626 bool f2fs_empty_dir(struct inode
*dir
)
629 struct page
*dentry_page
;
630 unsigned int bit_pos
;
631 struct f2fs_dentry_block
*dentry_blk
;
632 unsigned long nblock
= dir_blocks(dir
);
634 for (bidx
= 0; bidx
< nblock
; bidx
++) {
635 dentry_page
= get_lock_data_page(dir
, bidx
);
636 if (IS_ERR(dentry_page
)) {
637 if (PTR_ERR(dentry_page
) == -ENOENT
)
644 dentry_blk
= kmap_atomic(dentry_page
);
649 bit_pos
= find_next_bit_le(&dentry_blk
->dentry_bitmap
,
652 kunmap_atomic(dentry_blk
);
654 f2fs_put_page(dentry_page
, 1);
656 if (bit_pos
< NR_DENTRY_IN_BLOCK
)
662 static int f2fs_readdir(struct file
*file
, struct dir_context
*ctx
)
664 struct inode
*inode
= file_inode(file
);
665 unsigned long npages
= dir_blocks(inode
);
666 unsigned int bit_pos
= 0;
667 struct f2fs_dentry_block
*dentry_blk
= NULL
;
668 struct f2fs_dir_entry
*de
= NULL
;
669 struct page
*dentry_page
= NULL
;
670 struct file_ra_state
*ra
= &file
->f_ra
;
671 unsigned int n
= ((unsigned long)ctx
->pos
/ NR_DENTRY_IN_BLOCK
);
672 unsigned char d_type
= DT_UNKNOWN
;
674 bit_pos
= ((unsigned long)ctx
->pos
% NR_DENTRY_IN_BLOCK
);
676 /* readahead for multi pages of dir */
677 if (npages
- n
> 1 && !ra_has_index(ra
, n
))
678 page_cache_sync_readahead(inode
->i_mapping
, ra
, file
, n
,
679 min(npages
- n
, (pgoff_t
)MAX_DIR_RA_PAGES
));
681 for (; n
< npages
; n
++) {
682 dentry_page
= get_lock_data_page(inode
, n
);
683 if (IS_ERR(dentry_page
))
686 dentry_blk
= kmap(dentry_page
);
687 while (bit_pos
< NR_DENTRY_IN_BLOCK
) {
688 bit_pos
= find_next_bit_le(&dentry_blk
->dentry_bitmap
,
691 if (bit_pos
>= NR_DENTRY_IN_BLOCK
)
694 de
= &dentry_blk
->dentry
[bit_pos
];
695 if (de
->file_type
< F2FS_FT_MAX
)
696 d_type
= f2fs_filetype_table
[de
->file_type
];
700 dentry_blk
->filename
[bit_pos
],
701 le16_to_cpu(de
->name_len
),
702 le32_to_cpu(de
->ino
), d_type
))
705 bit_pos
+= GET_DENTRY_SLOTS(le16_to_cpu(de
->name_len
));
706 ctx
->pos
= n
* NR_DENTRY_IN_BLOCK
+ bit_pos
;
709 ctx
->pos
= (n
+ 1) * NR_DENTRY_IN_BLOCK
;
711 f2fs_put_page(dentry_page
, 1);
715 if (dentry_page
&& !IS_ERR(dentry_page
)) {
717 f2fs_put_page(dentry_page
, 1);
723 const struct file_operations f2fs_dir_operations
= {
724 .llseek
= generic_file_llseek
,
725 .read
= generic_read_dir
,
726 .iterate
= f2fs_readdir
,
727 .fsync
= f2fs_sync_file
,
728 .unlocked_ioctl
= f2fs_ioctl
,