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>
17 static unsigned long dir_blocks(struct inode
*inode
)
19 return ((unsigned long long) (i_size_read(inode
) + PAGE_CACHE_SIZE
- 1))
23 static unsigned int dir_buckets(unsigned int level
)
25 if (level
< MAX_DIR_HASH_DEPTH
/ 2)
28 return 1 << ((MAX_DIR_HASH_DEPTH
/ 2) - 1);
31 static unsigned int bucket_blocks(unsigned int level
)
33 if (level
< MAX_DIR_HASH_DEPTH
/ 2)
39 static unsigned char f2fs_filetype_table
[F2FS_FT_MAX
] = {
40 [F2FS_FT_UNKNOWN
] = DT_UNKNOWN
,
41 [F2FS_FT_REG_FILE
] = DT_REG
,
42 [F2FS_FT_DIR
] = DT_DIR
,
43 [F2FS_FT_CHRDEV
] = DT_CHR
,
44 [F2FS_FT_BLKDEV
] = DT_BLK
,
45 [F2FS_FT_FIFO
] = DT_FIFO
,
46 [F2FS_FT_SOCK
] = DT_SOCK
,
47 [F2FS_FT_SYMLINK
] = DT_LNK
,
51 static unsigned char f2fs_type_by_mode
[S_IFMT
>> S_SHIFT
] = {
52 [S_IFREG
>> S_SHIFT
] = F2FS_FT_REG_FILE
,
53 [S_IFDIR
>> S_SHIFT
] = F2FS_FT_DIR
,
54 [S_IFCHR
>> S_SHIFT
] = F2FS_FT_CHRDEV
,
55 [S_IFBLK
>> S_SHIFT
] = F2FS_FT_BLKDEV
,
56 [S_IFIFO
>> S_SHIFT
] = F2FS_FT_FIFO
,
57 [S_IFSOCK
>> S_SHIFT
] = F2FS_FT_SOCK
,
58 [S_IFLNK
>> S_SHIFT
] = F2FS_FT_SYMLINK
,
61 static void set_de_type(struct f2fs_dir_entry
*de
, struct inode
*inode
)
63 umode_t mode
= inode
->i_mode
;
64 de
->file_type
= f2fs_type_by_mode
[(mode
& S_IFMT
) >> S_SHIFT
];
67 static unsigned long dir_block_index(unsigned int level
, unsigned int idx
)
70 unsigned long bidx
= 0;
72 for (i
= 0; i
< level
; i
++)
73 bidx
+= dir_buckets(i
) * bucket_blocks(i
);
74 bidx
+= idx
* bucket_blocks(level
);
78 static bool early_match_name(const char *name
, size_t namelen
,
79 f2fs_hash_t namehash
, struct f2fs_dir_entry
*de
)
81 if (le16_to_cpu(de
->name_len
) != namelen
)
84 if (de
->hash_code
!= namehash
)
90 static struct f2fs_dir_entry
*find_in_block(struct page
*dentry_page
,
91 const char *name
, size_t namelen
, int *max_slots
,
92 f2fs_hash_t namehash
, struct page
**res_page
)
94 struct f2fs_dir_entry
*de
;
95 unsigned long bit_pos
, end_pos
, next_pos
;
96 struct f2fs_dentry_block
*dentry_blk
= kmap(dentry_page
);
99 bit_pos
= find_next_bit_le(&dentry_blk
->dentry_bitmap
,
100 NR_DENTRY_IN_BLOCK
, 0);
101 while (bit_pos
< NR_DENTRY_IN_BLOCK
) {
102 de
= &dentry_blk
->dentry
[bit_pos
];
103 slots
= GET_DENTRY_SLOTS(le16_to_cpu(de
->name_len
));
105 if (early_match_name(name
, namelen
, namehash
, de
)) {
106 if (!memcmp(dentry_blk
->filename
[bit_pos
],
108 *res_page
= dentry_page
;
112 next_pos
= bit_pos
+ slots
;
113 bit_pos
= find_next_bit_le(&dentry_blk
->dentry_bitmap
,
114 NR_DENTRY_IN_BLOCK
, next_pos
);
115 if (bit_pos
>= NR_DENTRY_IN_BLOCK
)
116 end_pos
= NR_DENTRY_IN_BLOCK
;
119 if (*max_slots
< end_pos
- next_pos
)
120 *max_slots
= end_pos
- next_pos
;
129 static struct f2fs_dir_entry
*find_in_level(struct inode
*dir
,
130 unsigned int level
, const char *name
, size_t namelen
,
131 f2fs_hash_t namehash
, struct page
**res_page
)
133 int s
= GET_DENTRY_SLOTS(namelen
);
134 unsigned int nbucket
, nblock
;
135 unsigned int bidx
, end_block
;
136 struct page
*dentry_page
;
137 struct f2fs_dir_entry
*de
= NULL
;
141 BUG_ON(level
> MAX_DIR_HASH_DEPTH
);
143 nbucket
= dir_buckets(level
);
144 nblock
= bucket_blocks(level
);
146 bidx
= dir_block_index(level
, le32_to_cpu(namehash
) % nbucket
);
147 end_block
= bidx
+ nblock
;
149 for (; bidx
< end_block
; bidx
++) {
150 /* no need to allocate new dentry pages to all the indices */
151 dentry_page
= find_data_page(dir
, bidx
, true);
152 if (IS_ERR(dentry_page
)) {
157 de
= find_in_block(dentry_page
, name
, namelen
,
158 &max_slots
, namehash
, res_page
);
164 f2fs_put_page(dentry_page
, 0);
167 if (!de
&& room
&& F2FS_I(dir
)->chash
!= namehash
) {
168 F2FS_I(dir
)->chash
= namehash
;
169 F2FS_I(dir
)->clevel
= level
;
176 * Find an entry in the specified directory with the wanted name.
177 * It returns the page where the entry was found (as a parameter - res_page),
178 * and the entry itself. Page is returned mapped and unlocked.
179 * Entry is guaranteed to be valid.
181 struct f2fs_dir_entry
*f2fs_find_entry(struct inode
*dir
,
182 struct qstr
*child
, struct page
**res_page
)
184 const char *name
= child
->name
;
185 size_t namelen
= child
->len
;
186 unsigned long npages
= dir_blocks(dir
);
187 struct f2fs_dir_entry
*de
= NULL
;
188 f2fs_hash_t name_hash
;
189 unsigned int max_depth
;
192 if (namelen
> F2FS_NAME_LEN
)
200 name_hash
= f2fs_dentry_hash(name
, namelen
);
201 max_depth
= F2FS_I(dir
)->i_current_depth
;
203 for (level
= 0; level
< max_depth
; level
++) {
204 de
= find_in_level(dir
, level
, name
,
205 namelen
, name_hash
, res_page
);
209 if (!de
&& F2FS_I(dir
)->chash
!= name_hash
) {
210 F2FS_I(dir
)->chash
= name_hash
;
211 F2FS_I(dir
)->clevel
= level
- 1;
216 struct f2fs_dir_entry
*f2fs_parent_dir(struct inode
*dir
, struct page
**p
)
218 struct page
*page
= NULL
;
219 struct f2fs_dir_entry
*de
= NULL
;
220 struct f2fs_dentry_block
*dentry_blk
= NULL
;
222 page
= get_lock_data_page(dir
, 0);
226 dentry_blk
= kmap(page
);
227 de
= &dentry_blk
->dentry
[1];
233 ino_t
f2fs_inode_by_name(struct inode
*dir
, struct qstr
*qstr
)
236 struct f2fs_dir_entry
*de
;
239 de
= f2fs_find_entry(dir
, qstr
, &page
);
241 res
= le32_to_cpu(de
->ino
);
243 f2fs_put_page(page
, 0);
249 void f2fs_set_link(struct inode
*dir
, struct f2fs_dir_entry
*de
,
250 struct page
*page
, struct inode
*inode
)
253 wait_on_page_writeback(page
);
254 de
->ino
= cpu_to_le32(inode
->i_ino
);
255 set_de_type(de
, inode
);
257 set_page_dirty(page
);
258 dir
->i_mtime
= dir
->i_ctime
= CURRENT_TIME
;
259 mark_inode_dirty(dir
);
261 /* update parent inode number before releasing dentry page */
262 F2FS_I(inode
)->i_pino
= dir
->i_ino
;
264 f2fs_put_page(page
, 1);
267 void init_dent_inode(const struct qstr
*name
, struct page
*ipage
)
269 struct f2fs_node
*rn
;
274 wait_on_page_writeback(ipage
);
276 /* copy name info. to this inode page */
277 rn
= (struct f2fs_node
*)page_address(ipage
);
278 rn
->i
.i_namelen
= cpu_to_le32(name
->len
);
279 memcpy(rn
->i
.i_name
, name
->name
, name
->len
);
280 set_page_dirty(ipage
);
283 static int make_empty_dir(struct inode
*inode
, struct inode
*parent
)
285 struct page
*dentry_page
;
286 struct f2fs_dentry_block
*dentry_blk
;
287 struct f2fs_dir_entry
*de
;
290 dentry_page
= get_new_data_page(inode
, 0, true);
291 if (IS_ERR(dentry_page
))
292 return PTR_ERR(dentry_page
);
294 kaddr
= kmap_atomic(dentry_page
);
295 dentry_blk
= (struct f2fs_dentry_block
*)kaddr
;
297 de
= &dentry_blk
->dentry
[0];
298 de
->name_len
= cpu_to_le16(1);
300 de
->ino
= cpu_to_le32(inode
->i_ino
);
301 memcpy(dentry_blk
->filename
[0], ".", 1);
302 set_de_type(de
, inode
);
304 de
= &dentry_blk
->dentry
[1];
306 de
->name_len
= cpu_to_le16(2);
307 de
->ino
= cpu_to_le32(parent
->i_ino
);
308 memcpy(dentry_blk
->filename
[1], "..", 2);
309 set_de_type(de
, inode
);
311 test_and_set_bit_le(0, &dentry_blk
->dentry_bitmap
);
312 test_and_set_bit_le(1, &dentry_blk
->dentry_bitmap
);
313 kunmap_atomic(kaddr
);
315 set_page_dirty(dentry_page
);
316 f2fs_put_page(dentry_page
, 1);
320 static int init_inode_metadata(struct inode
*inode
,
321 struct inode
*dir
, const struct qstr
*name
)
323 if (is_inode_flag_set(F2FS_I(inode
), FI_NEW_INODE
)) {
325 err
= new_inode_page(inode
, name
);
329 if (S_ISDIR(inode
->i_mode
)) {
330 err
= make_empty_dir(inode
, dir
);
332 remove_inode_page(inode
);
337 err
= f2fs_init_acl(inode
, dir
);
339 remove_inode_page(inode
);
344 ipage
= get_node_page(F2FS_SB(dir
->i_sb
), inode
->i_ino
);
346 return PTR_ERR(ipage
);
347 set_cold_node(inode
, ipage
);
348 init_dent_inode(name
, ipage
);
349 f2fs_put_page(ipage
, 1);
351 if (is_inode_flag_set(F2FS_I(inode
), FI_INC_LINK
)) {
353 update_inode_page(inode
);
358 static void update_parent_metadata(struct inode
*dir
, struct inode
*inode
,
359 unsigned int current_depth
)
361 bool need_dir_update
= false;
363 if (is_inode_flag_set(F2FS_I(inode
), FI_NEW_INODE
)) {
364 if (S_ISDIR(inode
->i_mode
)) {
366 need_dir_update
= true;
368 clear_inode_flag(F2FS_I(inode
), FI_NEW_INODE
);
370 dir
->i_mtime
= dir
->i_ctime
= CURRENT_TIME
;
371 if (F2FS_I(dir
)->i_current_depth
!= current_depth
) {
372 F2FS_I(dir
)->i_current_depth
= current_depth
;
373 need_dir_update
= true;
377 update_inode_page(dir
);
379 mark_inode_dirty(dir
);
381 if (is_inode_flag_set(F2FS_I(inode
), FI_INC_LINK
))
382 clear_inode_flag(F2FS_I(inode
), FI_INC_LINK
);
385 static int room_for_filename(struct f2fs_dentry_block
*dentry_blk
, int slots
)
388 int zero_start
, zero_end
;
390 zero_start
= find_next_zero_bit_le(&dentry_blk
->dentry_bitmap
,
393 if (zero_start
>= NR_DENTRY_IN_BLOCK
)
394 return NR_DENTRY_IN_BLOCK
;
396 zero_end
= find_next_bit_le(&dentry_blk
->dentry_bitmap
,
399 if (zero_end
- zero_start
>= slots
)
402 bit_start
= zero_end
+ 1;
404 if (zero_end
+ 1 >= NR_DENTRY_IN_BLOCK
)
405 return NR_DENTRY_IN_BLOCK
;
410 * Caller should grab and release a mutex by calling mutex_lock_op() and
413 int __f2fs_add_link(struct inode
*dir
, const struct qstr
*name
, struct inode
*inode
)
415 unsigned int bit_pos
;
417 unsigned int current_depth
;
418 unsigned long bidx
, block
;
419 f2fs_hash_t dentry_hash
;
420 struct f2fs_dir_entry
*de
;
421 unsigned int nbucket
, nblock
;
422 size_t namelen
= name
->len
;
423 struct page
*dentry_page
= NULL
;
424 struct f2fs_dentry_block
*dentry_blk
= NULL
;
425 int slots
= GET_DENTRY_SLOTS(namelen
);
429 dentry_hash
= f2fs_dentry_hash(name
->name
, name
->len
);
431 current_depth
= F2FS_I(dir
)->i_current_depth
;
432 if (F2FS_I(dir
)->chash
== dentry_hash
) {
433 level
= F2FS_I(dir
)->clevel
;
434 F2FS_I(dir
)->chash
= 0;
438 if (current_depth
== MAX_DIR_HASH_DEPTH
)
441 /* Increase the depth, if required */
442 if (level
== current_depth
)
445 nbucket
= dir_buckets(level
);
446 nblock
= bucket_blocks(level
);
448 bidx
= dir_block_index(level
, (le32_to_cpu(dentry_hash
) % nbucket
));
450 for (block
= bidx
; block
<= (bidx
+ nblock
- 1); block
++) {
451 dentry_page
= get_new_data_page(dir
, block
, true);
452 if (IS_ERR(dentry_page
))
453 return PTR_ERR(dentry_page
);
455 dentry_blk
= kmap(dentry_page
);
456 bit_pos
= room_for_filename(dentry_blk
, slots
);
457 if (bit_pos
< NR_DENTRY_IN_BLOCK
)
461 f2fs_put_page(dentry_page
, 1);
464 /* Move to next level to find the empty slot for new dentry */
468 err
= init_inode_metadata(inode
, dir
, name
);
472 wait_on_page_writeback(dentry_page
);
474 de
= &dentry_blk
->dentry
[bit_pos
];
475 de
->hash_code
= dentry_hash
;
476 de
->name_len
= cpu_to_le16(namelen
);
477 memcpy(dentry_blk
->filename
[bit_pos
], name
->name
, name
->len
);
478 de
->ino
= cpu_to_le32(inode
->i_ino
);
479 set_de_type(de
, inode
);
480 for (i
= 0; i
< slots
; i
++)
481 test_and_set_bit_le(bit_pos
+ i
, &dentry_blk
->dentry_bitmap
);
482 set_page_dirty(dentry_page
);
484 update_parent_metadata(dir
, inode
, current_depth
);
486 /* update parent inode number before releasing dentry page */
487 F2FS_I(inode
)->i_pino
= dir
->i_ino
;
490 f2fs_put_page(dentry_page
, 1);
495 * It only removes the dentry from the dentry page,corresponding name
496 * entry in name page does not need to be touched during deletion.
498 void f2fs_delete_entry(struct f2fs_dir_entry
*dentry
, struct page
*page
,
501 struct f2fs_dentry_block
*dentry_blk
;
502 unsigned int bit_pos
;
503 struct address_space
*mapping
= page
->mapping
;
504 struct inode
*dir
= mapping
->host
;
505 struct f2fs_sb_info
*sbi
= F2FS_SB(dir
->i_sb
);
506 int slots
= GET_DENTRY_SLOTS(le16_to_cpu(dentry
->name_len
));
507 void *kaddr
= page_address(page
);
511 wait_on_page_writeback(page
);
513 dentry_blk
= (struct f2fs_dentry_block
*)kaddr
;
514 bit_pos
= dentry
- (struct f2fs_dir_entry
*)dentry_blk
->dentry
;
515 for (i
= 0; i
< slots
; i
++)
516 test_and_clear_bit_le(bit_pos
+ i
, &dentry_blk
->dentry_bitmap
);
518 /* Let's check and deallocate this dentry page */
519 bit_pos
= find_next_bit_le(&dentry_blk
->dentry_bitmap
,
522 kunmap(page
); /* kunmap - pair of f2fs_find_entry */
523 set_page_dirty(page
);
525 dir
->i_ctime
= dir
->i_mtime
= CURRENT_TIME
;
527 if (inode
&& S_ISDIR(inode
->i_mode
)) {
529 update_inode_page(dir
);
531 mark_inode_dirty(dir
);
535 inode
->i_ctime
= CURRENT_TIME
;
537 if (S_ISDIR(inode
->i_mode
)) {
539 i_size_write(inode
, 0);
541 update_inode_page(inode
);
543 if (inode
->i_nlink
== 0)
544 add_orphan_inode(sbi
, inode
->i_ino
);
547 if (bit_pos
== NR_DENTRY_IN_BLOCK
) {
548 truncate_hole(dir
, page
->index
, page
->index
+ 1);
549 clear_page_dirty_for_io(page
);
550 ClearPageUptodate(page
);
551 dec_page_count(sbi
, F2FS_DIRTY_DENTS
);
552 inode_dec_dirty_dents(dir
);
554 f2fs_put_page(page
, 1);
557 bool f2fs_empty_dir(struct inode
*dir
)
560 struct page
*dentry_page
;
561 unsigned int bit_pos
;
562 struct f2fs_dentry_block
*dentry_blk
;
563 unsigned long nblock
= dir_blocks(dir
);
565 for (bidx
= 0; bidx
< nblock
; bidx
++) {
567 dentry_page
= get_lock_data_page(dir
, bidx
);
568 if (IS_ERR(dentry_page
)) {
569 if (PTR_ERR(dentry_page
) == -ENOENT
)
575 kaddr
= kmap_atomic(dentry_page
);
576 dentry_blk
= (struct f2fs_dentry_block
*)kaddr
;
581 bit_pos
= find_next_bit_le(&dentry_blk
->dentry_bitmap
,
584 kunmap_atomic(kaddr
);
586 f2fs_put_page(dentry_page
, 1);
588 if (bit_pos
< NR_DENTRY_IN_BLOCK
)
594 static int f2fs_readdir(struct file
*file
, void *dirent
, filldir_t filldir
)
596 unsigned long pos
= file
->f_pos
;
597 struct inode
*inode
= file_inode(file
);
598 unsigned long npages
= dir_blocks(inode
);
599 unsigned char *types
= NULL
;
600 unsigned int bit_pos
= 0, start_bit_pos
= 0;
602 struct f2fs_dentry_block
*dentry_blk
= NULL
;
603 struct f2fs_dir_entry
*de
= NULL
;
604 struct page
*dentry_page
= NULL
;
606 unsigned char d_type
= DT_UNKNOWN
;
609 types
= f2fs_filetype_table
;
610 bit_pos
= (pos
% NR_DENTRY_IN_BLOCK
);
611 n
= (pos
/ NR_DENTRY_IN_BLOCK
);
613 for ( ; n
< npages
; n
++) {
614 dentry_page
= get_lock_data_page(inode
, n
);
615 if (IS_ERR(dentry_page
))
618 start_bit_pos
= bit_pos
;
619 dentry_blk
= kmap(dentry_page
);
620 while (bit_pos
< NR_DENTRY_IN_BLOCK
) {
622 bit_pos
= find_next_bit_le(&dentry_blk
->dentry_bitmap
,
625 if (bit_pos
>= NR_DENTRY_IN_BLOCK
)
628 de
= &dentry_blk
->dentry
[bit_pos
];
629 if (types
&& de
->file_type
< F2FS_FT_MAX
)
630 d_type
= types
[de
->file_type
];
632 over
= filldir(dirent
,
633 dentry_blk
->filename
[bit_pos
],
634 le16_to_cpu(de
->name_len
),
635 (n
* NR_DENTRY_IN_BLOCK
) + bit_pos
,
636 le32_to_cpu(de
->ino
), d_type
);
638 file
->f_pos
+= bit_pos
- start_bit_pos
;
641 slots
= GET_DENTRY_SLOTS(le16_to_cpu(de
->name_len
));
645 file
->f_pos
= (n
+ 1) * NR_DENTRY_IN_BLOCK
;
647 f2fs_put_page(dentry_page
, 1);
651 if (dentry_page
&& !IS_ERR(dentry_page
)) {
653 f2fs_put_page(dentry_page
, 1);
659 const struct file_operations f2fs_dir_operations
= {
660 .llseek
= generic_file_llseek
,
661 .read
= generic_read_dir
,
662 .readdir
= f2fs_readdir
,
663 .fsync
= f2fs_sync_file
,
664 .unlocked_ioctl
= f2fs_ioctl
,