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>
16 static unsigned long dir_blocks(struct inode
*inode
)
18 return ((unsigned long long) (i_size_read(inode
) + PAGE_CACHE_SIZE
- 1))
22 static unsigned int dir_buckets(unsigned int level
)
24 if (level
< MAX_DIR_HASH_DEPTH
/ 2)
27 return 1 << ((MAX_DIR_HASH_DEPTH
/ 2) - 1);
30 static unsigned int bucket_blocks(unsigned int level
)
32 if (level
< MAX_DIR_HASH_DEPTH
/ 2)
38 static unsigned char f2fs_filetype_table
[F2FS_FT_MAX
] = {
39 [F2FS_FT_UNKNOWN
] = DT_UNKNOWN
,
40 [F2FS_FT_REG_FILE
] = DT_REG
,
41 [F2FS_FT_DIR
] = DT_DIR
,
42 [F2FS_FT_CHRDEV
] = DT_CHR
,
43 [F2FS_FT_BLKDEV
] = DT_BLK
,
44 [F2FS_FT_FIFO
] = DT_FIFO
,
45 [F2FS_FT_SOCK
] = DT_SOCK
,
46 [F2FS_FT_SYMLINK
] = DT_LNK
,
50 static unsigned char f2fs_type_by_mode
[S_IFMT
>> S_SHIFT
] = {
51 [S_IFREG
>> S_SHIFT
] = F2FS_FT_REG_FILE
,
52 [S_IFDIR
>> S_SHIFT
] = F2FS_FT_DIR
,
53 [S_IFCHR
>> S_SHIFT
] = F2FS_FT_CHRDEV
,
54 [S_IFBLK
>> S_SHIFT
] = F2FS_FT_BLKDEV
,
55 [S_IFIFO
>> S_SHIFT
] = F2FS_FT_FIFO
,
56 [S_IFSOCK
>> S_SHIFT
] = F2FS_FT_SOCK
,
57 [S_IFLNK
>> S_SHIFT
] = F2FS_FT_SYMLINK
,
60 static void set_de_type(struct f2fs_dir_entry
*de
, struct inode
*inode
)
62 mode_t mode
= inode
->i_mode
;
63 de
->file_type
= f2fs_type_by_mode
[(mode
& S_IFMT
) >> S_SHIFT
];
66 static unsigned long dir_block_index(unsigned int level
, unsigned int idx
)
69 unsigned long bidx
= 0;
71 for (i
= 0; i
< level
; i
++)
72 bidx
+= dir_buckets(i
) * bucket_blocks(i
);
73 bidx
+= idx
* bucket_blocks(level
);
77 static bool early_match_name(const char *name
, int namelen
,
78 f2fs_hash_t namehash
, struct f2fs_dir_entry
*de
)
80 if (le16_to_cpu(de
->name_len
) != namelen
)
83 if (de
->hash_code
!= namehash
)
89 static struct f2fs_dir_entry
*find_in_block(struct page
*dentry_page
,
90 const char *name
, int namelen
, int *max_slots
,
91 f2fs_hash_t namehash
, struct page
**res_page
)
93 struct f2fs_dir_entry
*de
;
94 unsigned long bit_pos
, end_pos
, next_pos
;
95 struct f2fs_dentry_block
*dentry_blk
= kmap(dentry_page
);
98 bit_pos
= find_next_bit_le(&dentry_blk
->dentry_bitmap
,
99 NR_DENTRY_IN_BLOCK
, 0);
100 while (bit_pos
< NR_DENTRY_IN_BLOCK
) {
101 de
= &dentry_blk
->dentry
[bit_pos
];
102 slots
= GET_DENTRY_SLOTS(le16_to_cpu(de
->name_len
));
104 if (early_match_name(name
, namelen
, namehash
, de
)) {
105 if (!memcmp(dentry_blk
->filename
[bit_pos
],
107 *res_page
= dentry_page
;
111 next_pos
= bit_pos
+ slots
;
112 bit_pos
= find_next_bit_le(&dentry_blk
->dentry_bitmap
,
113 NR_DENTRY_IN_BLOCK
, next_pos
);
114 if (bit_pos
>= NR_DENTRY_IN_BLOCK
)
115 end_pos
= NR_DENTRY_IN_BLOCK
;
118 if (*max_slots
< end_pos
- next_pos
)
119 *max_slots
= end_pos
- next_pos
;
128 static struct f2fs_dir_entry
*find_in_level(struct inode
*dir
,
129 unsigned int level
, const char *name
, int namelen
,
130 f2fs_hash_t namehash
, struct page
**res_page
)
132 int s
= GET_DENTRY_SLOTS(namelen
);
133 unsigned int nbucket
, nblock
;
134 unsigned int bidx
, end_block
;
135 struct page
*dentry_page
;
136 struct f2fs_dir_entry
*de
= NULL
;
140 BUG_ON(level
> MAX_DIR_HASH_DEPTH
);
142 nbucket
= dir_buckets(level
);
143 nblock
= bucket_blocks(level
);
145 bidx
= dir_block_index(level
, le32_to_cpu(namehash
) % nbucket
);
146 end_block
= bidx
+ nblock
;
148 for (; bidx
< end_block
; bidx
++) {
149 /* no need to allocate new dentry pages to all the indices */
150 dentry_page
= find_data_page(dir
, bidx
);
151 if (IS_ERR(dentry_page
)) {
156 de
= find_in_block(dentry_page
, name
, namelen
,
157 &max_slots
, namehash
, res_page
);
163 f2fs_put_page(dentry_page
, 0);
166 if (!de
&& room
&& F2FS_I(dir
)->chash
!= namehash
) {
167 F2FS_I(dir
)->chash
= namehash
;
168 F2FS_I(dir
)->clevel
= level
;
175 * Find an entry in the specified directory with the wanted name.
176 * It returns the page where the entry was found (as a parameter - res_page),
177 * and the entry itself. Page is returned mapped and unlocked.
178 * Entry is guaranteed to be valid.
180 struct f2fs_dir_entry
*f2fs_find_entry(struct inode
*dir
,
181 struct qstr
*child
, struct page
**res_page
)
183 const char *name
= child
->name
;
184 int namelen
= child
->len
;
185 unsigned long npages
= dir_blocks(dir
);
186 struct f2fs_dir_entry
*de
= NULL
;
187 f2fs_hash_t name_hash
;
188 unsigned int max_depth
;
196 name_hash
= f2fs_dentry_hash(name
, namelen
);
197 max_depth
= F2FS_I(dir
)->i_current_depth
;
199 for (level
= 0; level
< max_depth
; level
++) {
200 de
= find_in_level(dir
, level
, name
,
201 namelen
, name_hash
, res_page
);
205 if (!de
&& F2FS_I(dir
)->chash
!= name_hash
) {
206 F2FS_I(dir
)->chash
= name_hash
;
207 F2FS_I(dir
)->clevel
= level
- 1;
212 struct f2fs_dir_entry
*f2fs_parent_dir(struct inode
*dir
, struct page
**p
)
214 struct page
*page
= NULL
;
215 struct f2fs_dir_entry
*de
= NULL
;
216 struct f2fs_dentry_block
*dentry_blk
= NULL
;
218 page
= get_lock_data_page(dir
, 0);
222 dentry_blk
= kmap(page
);
223 de
= &dentry_blk
->dentry
[1];
229 ino_t
f2fs_inode_by_name(struct inode
*dir
, struct qstr
*qstr
)
232 struct f2fs_dir_entry
*de
;
235 de
= f2fs_find_entry(dir
, qstr
, &page
);
237 res
= le32_to_cpu(de
->ino
);
239 f2fs_put_page(page
, 0);
245 void f2fs_set_link(struct inode
*dir
, struct f2fs_dir_entry
*de
,
246 struct page
*page
, struct inode
*inode
)
248 struct f2fs_sb_info
*sbi
= F2FS_SB(dir
->i_sb
);
250 mutex_lock_op(sbi
, DENTRY_OPS
);
252 wait_on_page_writeback(page
);
253 de
->ino
= cpu_to_le32(inode
->i_ino
);
254 set_de_type(de
, inode
);
256 set_page_dirty(page
);
257 dir
->i_mtime
= dir
->i_ctime
= CURRENT_TIME
;
258 mark_inode_dirty(dir
);
259 f2fs_put_page(page
, 1);
260 mutex_unlock_op(sbi
, DENTRY_OPS
);
263 void init_dent_inode(struct dentry
*dentry
, struct page
*ipage
)
265 struct inode
*dir
= dentry
->d_parent
->d_inode
;
266 struct f2fs_node
*rn
;
271 wait_on_page_writeback(ipage
);
273 /* copy dentry info. to this inode page */
274 rn
= (struct f2fs_node
*)page_address(ipage
);
275 rn
->i
.i_pino
= cpu_to_le32(dir
->i_ino
);
276 rn
->i
.i_namelen
= cpu_to_le32(dentry
->d_name
.len
);
277 memcpy(rn
->i
.i_name
, dentry
->d_name
.name
, dentry
->d_name
.len
);
278 set_page_dirty(ipage
);
281 static int init_inode_metadata(struct inode
*inode
, struct dentry
*dentry
)
283 struct inode
*dir
= dentry
->d_parent
->d_inode
;
285 if (is_inode_flag_set(F2FS_I(inode
), FI_NEW_INODE
)) {
287 err
= new_inode_page(inode
, dentry
);
291 if (S_ISDIR(inode
->i_mode
)) {
292 err
= f2fs_make_empty(inode
, dir
);
294 remove_inode_page(inode
);
299 err
= f2fs_init_acl(inode
, dir
);
301 remove_inode_page(inode
);
306 ipage
= get_node_page(F2FS_SB(dir
->i_sb
), inode
->i_ino
);
308 return PTR_ERR(ipage
);
309 init_dent_inode(dentry
, ipage
);
310 f2fs_put_page(ipage
, 1);
312 if (is_inode_flag_set(F2FS_I(inode
), FI_INC_LINK
)) {
314 f2fs_write_inode(inode
, NULL
);
319 static void update_parent_metadata(struct inode
*dir
, struct inode
*inode
,
320 unsigned int current_depth
)
322 bool need_dir_update
= false;
324 if (is_inode_flag_set(F2FS_I(inode
), FI_NEW_INODE
)) {
325 if (S_ISDIR(inode
->i_mode
)) {
327 need_dir_update
= true;
329 clear_inode_flag(F2FS_I(inode
), FI_NEW_INODE
);
331 dir
->i_mtime
= dir
->i_ctime
= CURRENT_TIME
;
332 if (F2FS_I(dir
)->i_current_depth
!= current_depth
) {
333 F2FS_I(dir
)->i_current_depth
= current_depth
;
334 need_dir_update
= true;
338 f2fs_write_inode(dir
, NULL
);
340 mark_inode_dirty(dir
);
342 if (is_inode_flag_set(F2FS_I(inode
), FI_INC_LINK
))
343 clear_inode_flag(F2FS_I(inode
), FI_INC_LINK
);
346 static int room_for_filename(struct f2fs_dentry_block
*dentry_blk
, int slots
)
349 int zero_start
, zero_end
;
351 zero_start
= find_next_zero_bit_le(&dentry_blk
->dentry_bitmap
,
354 if (zero_start
>= NR_DENTRY_IN_BLOCK
)
355 return NR_DENTRY_IN_BLOCK
;
357 zero_end
= find_next_bit_le(&dentry_blk
->dentry_bitmap
,
360 if (zero_end
- zero_start
>= slots
)
363 bit_start
= zero_end
+ 1;
365 if (zero_end
+ 1 >= NR_DENTRY_IN_BLOCK
)
366 return NR_DENTRY_IN_BLOCK
;
370 int f2fs_add_link(struct dentry
*dentry
, struct inode
*inode
)
372 unsigned int bit_pos
;
374 unsigned int current_depth
;
375 unsigned long bidx
, block
;
376 f2fs_hash_t dentry_hash
;
377 struct f2fs_dir_entry
*de
;
378 unsigned int nbucket
, nblock
;
379 struct inode
*dir
= dentry
->d_parent
->d_inode
;
380 struct f2fs_sb_info
*sbi
= F2FS_SB(dir
->i_sb
);
381 const char *name
= dentry
->d_name
.name
;
382 int namelen
= dentry
->d_name
.len
;
383 struct page
*dentry_page
= NULL
;
384 struct f2fs_dentry_block
*dentry_blk
= NULL
;
385 int slots
= GET_DENTRY_SLOTS(namelen
);
389 dentry_hash
= f2fs_dentry_hash(name
, dentry
->d_name
.len
);
391 current_depth
= F2FS_I(dir
)->i_current_depth
;
392 if (F2FS_I(dir
)->chash
== dentry_hash
) {
393 level
= F2FS_I(dir
)->clevel
;
394 F2FS_I(dir
)->chash
= 0;
398 if (current_depth
== MAX_DIR_HASH_DEPTH
)
401 /* Increase the depth, if required */
402 if (level
== current_depth
)
405 nbucket
= dir_buckets(level
);
406 nblock
= bucket_blocks(level
);
408 bidx
= dir_block_index(level
, (le32_to_cpu(dentry_hash
) % nbucket
));
410 for (block
= bidx
; block
<= (bidx
+ nblock
- 1); block
++) {
411 mutex_lock_op(sbi
, DENTRY_OPS
);
412 dentry_page
= get_new_data_page(dir
, block
, true);
413 if (IS_ERR(dentry_page
)) {
414 mutex_unlock_op(sbi
, DENTRY_OPS
);
415 return PTR_ERR(dentry_page
);
418 dentry_blk
= kmap(dentry_page
);
419 bit_pos
= room_for_filename(dentry_blk
, slots
);
420 if (bit_pos
< NR_DENTRY_IN_BLOCK
)
424 f2fs_put_page(dentry_page
, 1);
425 mutex_unlock_op(sbi
, DENTRY_OPS
);
428 /* Move to next level to find the empty slot for new dentry */
432 err
= init_inode_metadata(inode
, dentry
);
436 wait_on_page_writeback(dentry_page
);
438 de
= &dentry_blk
->dentry
[bit_pos
];
439 de
->hash_code
= dentry_hash
;
440 de
->name_len
= cpu_to_le16(namelen
);
441 memcpy(dentry_blk
->filename
[bit_pos
], name
, namelen
);
442 de
->ino
= cpu_to_le32(inode
->i_ino
);
443 set_de_type(de
, inode
);
444 for (i
= 0; i
< slots
; i
++)
445 test_and_set_bit_le(bit_pos
+ i
, &dentry_blk
->dentry_bitmap
);
446 set_page_dirty(dentry_page
);
447 update_parent_metadata(dir
, inode
, current_depth
);
450 f2fs_put_page(dentry_page
, 1);
451 mutex_unlock_op(sbi
, DENTRY_OPS
);
456 * It only removes the dentry from the dentry page,corresponding name
457 * entry in name page does not need to be touched during deletion.
459 void f2fs_delete_entry(struct f2fs_dir_entry
*dentry
, struct page
*page
,
462 struct f2fs_dentry_block
*dentry_blk
;
463 unsigned int bit_pos
;
464 struct address_space
*mapping
= page
->mapping
;
465 struct inode
*dir
= mapping
->host
;
466 struct f2fs_sb_info
*sbi
= F2FS_SB(dir
->i_sb
);
467 int slots
= GET_DENTRY_SLOTS(le16_to_cpu(dentry
->name_len
));
468 void *kaddr
= page_address(page
);
471 mutex_lock_op(sbi
, DENTRY_OPS
);
474 wait_on_page_writeback(page
);
476 dentry_blk
= (struct f2fs_dentry_block
*)kaddr
;
477 bit_pos
= dentry
- (struct f2fs_dir_entry
*)dentry_blk
->dentry
;
478 for (i
= 0; i
< slots
; i
++)
479 test_and_clear_bit_le(bit_pos
+ i
, &dentry_blk
->dentry_bitmap
);
481 /* Let's check and deallocate this dentry page */
482 bit_pos
= find_next_bit_le(&dentry_blk
->dentry_bitmap
,
485 kunmap(page
); /* kunmap - pair of f2fs_find_entry */
486 set_page_dirty(page
);
488 dir
->i_ctime
= dir
->i_mtime
= CURRENT_TIME
;
490 if (inode
&& S_ISDIR(inode
->i_mode
)) {
492 f2fs_write_inode(dir
, NULL
);
494 mark_inode_dirty(dir
);
498 inode
->i_ctime
= dir
->i_ctime
= dir
->i_mtime
= CURRENT_TIME
;
500 if (S_ISDIR(inode
->i_mode
)) {
502 i_size_write(inode
, 0);
504 f2fs_write_inode(inode
, NULL
);
505 if (inode
->i_nlink
== 0)
506 add_orphan_inode(sbi
, inode
->i_ino
);
509 if (bit_pos
== NR_DENTRY_IN_BLOCK
) {
510 truncate_hole(dir
, page
->index
, page
->index
+ 1);
511 clear_page_dirty_for_io(page
);
512 ClearPageUptodate(page
);
513 dec_page_count(sbi
, F2FS_DIRTY_DENTS
);
514 inode_dec_dirty_dents(dir
);
516 f2fs_put_page(page
, 1);
518 mutex_unlock_op(sbi
, DENTRY_OPS
);
521 int f2fs_make_empty(struct inode
*inode
, struct inode
*parent
)
523 struct page
*dentry_page
;
524 struct f2fs_dentry_block
*dentry_blk
;
525 struct f2fs_dir_entry
*de
;
528 dentry_page
= get_new_data_page(inode
, 0, true);
529 if (IS_ERR(dentry_page
))
530 return PTR_ERR(dentry_page
);
532 kaddr
= kmap_atomic(dentry_page
);
533 dentry_blk
= (struct f2fs_dentry_block
*)kaddr
;
535 de
= &dentry_blk
->dentry
[0];
536 de
->name_len
= cpu_to_le16(1);
538 de
->ino
= cpu_to_le32(inode
->i_ino
);
539 memcpy(dentry_blk
->filename
[0], ".", 1);
540 set_de_type(de
, inode
);
542 de
= &dentry_blk
->dentry
[1];
544 de
->name_len
= cpu_to_le16(2);
545 de
->ino
= cpu_to_le32(parent
->i_ino
);
546 memcpy(dentry_blk
->filename
[1], "..", 2);
547 set_de_type(de
, inode
);
549 test_and_set_bit_le(0, &dentry_blk
->dentry_bitmap
);
550 test_and_set_bit_le(1, &dentry_blk
->dentry_bitmap
);
551 kunmap_atomic(kaddr
);
553 set_page_dirty(dentry_page
);
554 f2fs_put_page(dentry_page
, 1);
558 bool f2fs_empty_dir(struct inode
*dir
)
561 struct page
*dentry_page
;
562 unsigned int bit_pos
;
563 struct f2fs_dentry_block
*dentry_blk
;
564 unsigned long nblock
= dir_blocks(dir
);
566 for (bidx
= 0; bidx
< nblock
; bidx
++) {
568 dentry_page
= get_lock_data_page(dir
, bidx
);
569 if (IS_ERR(dentry_page
)) {
570 if (PTR_ERR(dentry_page
) == -ENOENT
)
576 kaddr
= kmap_atomic(dentry_page
);
577 dentry_blk
= (struct f2fs_dentry_block
*)kaddr
;
582 bit_pos
= find_next_bit_le(&dentry_blk
->dentry_bitmap
,
585 kunmap_atomic(kaddr
);
587 f2fs_put_page(dentry_page
, 1);
589 if (bit_pos
< NR_DENTRY_IN_BLOCK
)
595 static int f2fs_readdir(struct file
*file
, void *dirent
, filldir_t filldir
)
597 unsigned long pos
= file
->f_pos
;
598 struct inode
*inode
= file
->f_dentry
->d_inode
;
599 unsigned long npages
= dir_blocks(inode
);
600 unsigned char *types
= NULL
;
601 unsigned int bit_pos
= 0, start_bit_pos
= 0;
603 struct f2fs_dentry_block
*dentry_blk
= NULL
;
604 struct f2fs_dir_entry
*de
= NULL
;
605 struct page
*dentry_page
= NULL
;
607 unsigned char d_type
= DT_UNKNOWN
;
610 types
= f2fs_filetype_table
;
611 bit_pos
= (pos
% NR_DENTRY_IN_BLOCK
);
612 n
= (pos
/ NR_DENTRY_IN_BLOCK
);
614 for ( ; n
< npages
; n
++) {
615 dentry_page
= get_lock_data_page(inode
, n
);
616 if (IS_ERR(dentry_page
))
619 start_bit_pos
= bit_pos
;
620 dentry_blk
= kmap(dentry_page
);
621 while (bit_pos
< NR_DENTRY_IN_BLOCK
) {
623 bit_pos
= find_next_bit_le(&dentry_blk
->dentry_bitmap
,
626 if (bit_pos
>= NR_DENTRY_IN_BLOCK
)
629 de
= &dentry_blk
->dentry
[bit_pos
];
630 if (types
&& de
->file_type
< F2FS_FT_MAX
)
631 d_type
= types
[de
->file_type
];
633 over
= filldir(dirent
,
634 dentry_blk
->filename
[bit_pos
],
635 le16_to_cpu(de
->name_len
),
636 (n
* NR_DENTRY_IN_BLOCK
) + bit_pos
,
637 le32_to_cpu(de
->ino
), d_type
);
639 file
->f_pos
+= bit_pos
- start_bit_pos
;
642 slots
= GET_DENTRY_SLOTS(le16_to_cpu(de
->name_len
));
646 file
->f_pos
= (n
+ 1) * NR_DENTRY_IN_BLOCK
;
648 f2fs_put_page(dentry_page
, 1);
652 if (dentry_page
&& !IS_ERR(dentry_page
)) {
654 f2fs_put_page(dentry_page
, 1);
660 const struct file_operations f2fs_dir_operations
= {
661 .llseek
= generic_file_llseek
,
662 .read
= generic_read_dir
,
663 .readdir
= f2fs_readdir
,
664 .fsync
= f2fs_sync_file
,
665 .unlocked_ioctl
= f2fs_ioctl
,