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_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
,
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 void set_de_type(struct f2fs_dir_entry
*de
, umode_t mode
)
63 de
->file_type
= f2fs_type_by_mode
[(mode
& S_IFMT
) >> S_SHIFT
];
66 unsigned char get_de_type(struct f2fs_dir_entry
*de
)
68 if (de
->file_type
< F2FS_FT_MAX
)
69 return f2fs_filetype_table
[de
->file_type
];
73 static unsigned long dir_block_index(unsigned int level
,
74 int dir_level
, unsigned int idx
)
77 unsigned long bidx
= 0;
79 for (i
= 0; i
< level
; i
++)
80 bidx
+= dir_buckets(i
, dir_level
) * bucket_blocks(i
);
81 bidx
+= idx
* bucket_blocks(level
);
85 static struct f2fs_dir_entry
*find_in_block(struct page
*dentry_page
,
86 struct fscrypt_name
*fname
,
89 struct page
**res_page
)
91 struct f2fs_dentry_block
*dentry_blk
;
92 struct f2fs_dir_entry
*de
;
93 struct f2fs_dentry_ptr d
;
95 dentry_blk
= (struct f2fs_dentry_block
*)kmap(dentry_page
);
97 make_dentry_ptr(NULL
, &d
, (void *)dentry_blk
, 1);
98 de
= find_target_dentry(fname
, namehash
, max_slots
, &d
);
100 *res_page
= dentry_page
;
107 struct f2fs_dir_entry
*find_target_dentry(struct fscrypt_name
*fname
,
108 f2fs_hash_t namehash
, int *max_slots
,
109 struct f2fs_dentry_ptr
*d
)
111 struct f2fs_dir_entry
*de
;
112 unsigned long bit_pos
= 0;
114 struct fscrypt_str de_name
= FSTR_INIT(NULL
, 0);
115 struct fscrypt_str
*name
= &fname
->disk_name
;
119 while (bit_pos
< d
->max
) {
120 if (!test_bit_le(bit_pos
, d
->bitmap
)) {
126 de
= &d
->dentry
[bit_pos
];
128 if (unlikely(!de
->name_len
)) {
134 de_name
.name
= d
->filename
[bit_pos
];
135 de_name
.len
= le16_to_cpu(de
->name_len
);
137 /* show encrypted name */
139 if (de
->hash_code
== cpu_to_le32(fname
->hash
))
141 } else if (de_name
.len
== name
->len
&&
142 de
->hash_code
== namehash
&&
143 !memcmp(de_name
.name
, name
->name
, name
->len
))
146 if (max_slots
&& max_len
> *max_slots
)
147 *max_slots
= max_len
;
150 bit_pos
+= GET_DENTRY_SLOTS(le16_to_cpu(de
->name_len
));
155 if (max_slots
&& max_len
> *max_slots
)
156 *max_slots
= max_len
;
160 static struct f2fs_dir_entry
*find_in_level(struct inode
*dir
,
162 struct fscrypt_name
*fname
,
163 struct page
**res_page
)
165 struct qstr name
= FSTR_TO_QSTR(&fname
->disk_name
);
166 int s
= GET_DENTRY_SLOTS(name
.len
);
167 unsigned int nbucket
, nblock
;
168 unsigned int bidx
, end_block
;
169 struct page
*dentry_page
;
170 struct f2fs_dir_entry
*de
= NULL
;
173 f2fs_hash_t namehash
;
176 namehash
= cpu_to_le32(fname
->hash
);
178 namehash
= f2fs_dentry_hash(&name
);
180 nbucket
= dir_buckets(level
, F2FS_I(dir
)->i_dir_level
);
181 nblock
= bucket_blocks(level
);
183 bidx
= dir_block_index(level
, F2FS_I(dir
)->i_dir_level
,
184 le32_to_cpu(namehash
) % nbucket
);
185 end_block
= bidx
+ nblock
;
187 for (; bidx
< end_block
; bidx
++) {
188 /* no need to allocate new dentry pages to all the indices */
189 dentry_page
= find_data_page(dir
, bidx
);
190 if (IS_ERR(dentry_page
)) {
191 if (PTR_ERR(dentry_page
) == -ENOENT
) {
195 *res_page
= dentry_page
;
200 de
= find_in_block(dentry_page
, fname
, namehash
, &max_slots
,
207 f2fs_put_page(dentry_page
, 0);
210 /* This is to increase the speed of f2fs_create */
212 F2FS_I(dir
)->task
= current
;
213 if (F2FS_I(dir
)->chash
!= namehash
) {
214 F2FS_I(dir
)->chash
= namehash
;
215 F2FS_I(dir
)->clevel
= level
;
222 struct f2fs_dir_entry
*__f2fs_find_entry(struct inode
*dir
,
223 struct fscrypt_name
*fname
, struct page
**res_page
)
225 unsigned long npages
= dir_blocks(dir
);
226 struct f2fs_dir_entry
*de
= NULL
;
227 unsigned int max_depth
;
230 if (f2fs_has_inline_dentry(dir
)) {
232 de
= find_in_inline_dir(dir
, fname
, res_page
);
241 max_depth
= F2FS_I(dir
)->i_current_depth
;
242 if (unlikely(max_depth
> MAX_DIR_HASH_DEPTH
)) {
243 f2fs_msg(F2FS_I_SB(dir
)->sb
, KERN_WARNING
,
244 "Corrupted max_depth of %lu: %u",
245 dir
->i_ino
, max_depth
);
246 max_depth
= MAX_DIR_HASH_DEPTH
;
247 f2fs_i_depth_write(dir
, max_depth
);
250 for (level
= 0; level
< max_depth
; level
++) {
252 de
= find_in_level(dir
, level
, fname
, res_page
);
253 if (de
|| IS_ERR(*res_page
))
261 * Find an entry in the specified directory with the wanted name.
262 * It returns the page where the entry was found (as a parameter - res_page),
263 * and the entry itself. Page is returned mapped and unlocked.
264 * Entry is guaranteed to be valid.
266 struct f2fs_dir_entry
*f2fs_find_entry(struct inode
*dir
,
267 const struct qstr
*child
, struct page
**res_page
)
269 struct f2fs_dir_entry
*de
= NULL
;
270 struct fscrypt_name fname
;
273 err
= fscrypt_setup_filename(dir
, child
, 1, &fname
);
275 *res_page
= ERR_PTR(err
);
279 de
= __f2fs_find_entry(dir
, &fname
, res_page
);
281 fscrypt_free_filename(&fname
);
285 struct f2fs_dir_entry
*f2fs_parent_dir(struct inode
*dir
, struct page
**p
)
287 struct qstr dotdot
= QSTR_INIT("..", 2);
289 return f2fs_find_entry(dir
, &dotdot
, p
);
292 ino_t
f2fs_inode_by_name(struct inode
*dir
, const struct qstr
*qstr
,
296 struct f2fs_dir_entry
*de
;
298 de
= f2fs_find_entry(dir
, qstr
, page
);
300 res
= le32_to_cpu(de
->ino
);
301 f2fs_dentry_kunmap(dir
, *page
);
302 f2fs_put_page(*page
, 0);
308 void f2fs_set_link(struct inode
*dir
, struct f2fs_dir_entry
*de
,
309 struct page
*page
, struct inode
*inode
)
311 enum page_type type
= f2fs_has_inline_dentry(dir
) ? NODE
: DATA
;
313 f2fs_wait_on_page_writeback(page
, type
, true);
314 de
->ino
= cpu_to_le32(inode
->i_ino
);
315 set_de_type(de
, inode
->i_mode
);
316 f2fs_dentry_kunmap(dir
, page
);
317 set_page_dirty(page
);
319 dir
->i_mtime
= dir
->i_ctime
= current_time(dir
);
320 f2fs_mark_inode_dirty_sync(dir
, false);
321 f2fs_put_page(page
, 1);
324 static void init_dent_inode(const struct qstr
*name
, struct page
*ipage
)
326 struct f2fs_inode
*ri
;
328 f2fs_wait_on_page_writeback(ipage
, NODE
, true);
330 /* copy name info. to this inode page */
331 ri
= F2FS_INODE(ipage
);
332 ri
->i_namelen
= cpu_to_le32(name
->len
);
333 memcpy(ri
->i_name
, name
->name
, name
->len
);
334 set_page_dirty(ipage
);
337 int update_dent_inode(struct inode
*inode
, struct inode
*to
,
338 const struct qstr
*name
)
342 if (file_enc_name(to
))
345 page
= get_node_page(F2FS_I_SB(inode
), inode
->i_ino
);
347 return PTR_ERR(page
);
349 init_dent_inode(name
, page
);
350 f2fs_put_page(page
, 1);
355 void do_make_empty_dir(struct inode
*inode
, struct inode
*parent
,
356 struct f2fs_dentry_ptr
*d
)
358 struct qstr dot
= QSTR_INIT(".", 1);
359 struct qstr dotdot
= QSTR_INIT("..", 2);
361 /* update dirent of "." */
362 f2fs_update_dentry(inode
->i_ino
, inode
->i_mode
, d
, &dot
, 0, 0);
364 /* update dirent of ".." */
365 f2fs_update_dentry(parent
->i_ino
, parent
->i_mode
, d
, &dotdot
, 0, 1);
368 static int make_empty_dir(struct inode
*inode
,
369 struct inode
*parent
, struct page
*page
)
371 struct page
*dentry_page
;
372 struct f2fs_dentry_block
*dentry_blk
;
373 struct f2fs_dentry_ptr d
;
375 if (f2fs_has_inline_dentry(inode
))
376 return make_empty_inline_dir(inode
, parent
, page
);
378 dentry_page
= get_new_data_page(inode
, page
, 0, true);
379 if (IS_ERR(dentry_page
))
380 return PTR_ERR(dentry_page
);
382 dentry_blk
= kmap_atomic(dentry_page
);
384 make_dentry_ptr(NULL
, &d
, (void *)dentry_blk
, 1);
385 do_make_empty_dir(inode
, parent
, &d
);
387 kunmap_atomic(dentry_blk
);
389 set_page_dirty(dentry_page
);
390 f2fs_put_page(dentry_page
, 1);
394 struct page
*init_inode_metadata(struct inode
*inode
, struct inode
*dir
,
395 const struct qstr
*new_name
, const struct qstr
*orig_name
,
401 if (is_inode_flag_set(inode
, FI_NEW_INODE
)) {
402 page
= new_inode_page(inode
);
406 if (S_ISDIR(inode
->i_mode
)) {
407 /* in order to handle error case */
409 err
= make_empty_dir(inode
, dir
, page
);
417 err
= f2fs_init_acl(inode
, dir
, page
, dpage
);
421 err
= f2fs_init_security(inode
, dir
, orig_name
, page
);
425 if (f2fs_encrypted_inode(dir
) && f2fs_may_encrypt(inode
)) {
426 err
= fscrypt_inherit_context(dir
, inode
, page
, false);
431 page
= get_node_page(F2FS_I_SB(dir
), inode
->i_ino
);
435 set_cold_node(inode
, page
);
439 init_dent_inode(new_name
, page
);
442 * This file should be checkpointed during fsync.
443 * We lost i_pino from now on.
445 if (is_inode_flag_set(inode
, FI_INC_LINK
)) {
446 file_lost_pino(inode
);
448 * If link the tmpfile to alias through linkat path,
449 * we should remove this inode from orphan list.
451 if (inode
->i_nlink
== 0)
452 remove_orphan_inode(F2FS_I_SB(dir
), inode
->i_ino
);
453 f2fs_i_links_write(inode
, true);
459 update_inode(inode
, page
);
460 f2fs_put_page(page
, 1);
464 void update_parent_metadata(struct inode
*dir
, struct inode
*inode
,
465 unsigned int current_depth
)
467 if (inode
&& is_inode_flag_set(inode
, FI_NEW_INODE
)) {
468 if (S_ISDIR(inode
->i_mode
))
469 f2fs_i_links_write(dir
, true);
470 clear_inode_flag(inode
, FI_NEW_INODE
);
472 dir
->i_mtime
= dir
->i_ctime
= current_time(dir
);
473 f2fs_mark_inode_dirty_sync(dir
, false);
475 if (F2FS_I(dir
)->i_current_depth
!= current_depth
)
476 f2fs_i_depth_write(dir
, current_depth
);
478 if (inode
&& is_inode_flag_set(inode
, FI_INC_LINK
))
479 clear_inode_flag(inode
, FI_INC_LINK
);
482 int room_for_filename(const void *bitmap
, int slots
, int max_slots
)
485 int zero_start
, zero_end
;
487 zero_start
= find_next_zero_bit_le(bitmap
, max_slots
, bit_start
);
488 if (zero_start
>= max_slots
)
491 zero_end
= find_next_bit_le(bitmap
, max_slots
, zero_start
);
492 if (zero_end
- zero_start
>= slots
)
495 bit_start
= zero_end
+ 1;
497 if (zero_end
+ 1 >= max_slots
)
502 void f2fs_update_dentry(nid_t ino
, umode_t mode
, struct f2fs_dentry_ptr
*d
,
503 const struct qstr
*name
, f2fs_hash_t name_hash
,
504 unsigned int bit_pos
)
506 struct f2fs_dir_entry
*de
;
507 int slots
= GET_DENTRY_SLOTS(name
->len
);
510 de
= &d
->dentry
[bit_pos
];
511 de
->hash_code
= name_hash
;
512 de
->name_len
= cpu_to_le16(name
->len
);
513 memcpy(d
->filename
[bit_pos
], name
->name
, name
->len
);
514 de
->ino
= cpu_to_le32(ino
);
515 set_de_type(de
, mode
);
516 for (i
= 0; i
< slots
; i
++) {
517 __set_bit_le(bit_pos
+ i
, (void *)d
->bitmap
);
518 /* avoid wrong garbage data for readdir */
520 (de
+ i
)->name_len
= 0;
524 int f2fs_add_regular_entry(struct inode
*dir
, const struct qstr
*new_name
,
525 const struct qstr
*orig_name
,
526 struct inode
*inode
, nid_t ino
, umode_t mode
)
528 unsigned int bit_pos
;
530 unsigned int current_depth
;
531 unsigned long bidx
, block
;
532 f2fs_hash_t dentry_hash
;
533 unsigned int nbucket
, nblock
;
534 struct page
*dentry_page
= NULL
;
535 struct f2fs_dentry_block
*dentry_blk
= NULL
;
536 struct f2fs_dentry_ptr d
;
537 struct page
*page
= NULL
;
541 slots
= GET_DENTRY_SLOTS(new_name
->len
);
542 dentry_hash
= f2fs_dentry_hash(new_name
);
544 current_depth
= F2FS_I(dir
)->i_current_depth
;
545 if (F2FS_I(dir
)->chash
== dentry_hash
) {
546 level
= F2FS_I(dir
)->clevel
;
547 F2FS_I(dir
)->chash
= 0;
551 #ifdef CONFIG_F2FS_FAULT_INJECTION
552 if (time_to_inject(F2FS_I_SB(dir
), FAULT_DIR_DEPTH
))
555 if (unlikely(current_depth
== MAX_DIR_HASH_DEPTH
))
558 /* Increase the depth, if required */
559 if (level
== current_depth
)
562 nbucket
= dir_buckets(level
, F2FS_I(dir
)->i_dir_level
);
563 nblock
= bucket_blocks(level
);
565 bidx
= dir_block_index(level
, F2FS_I(dir
)->i_dir_level
,
566 (le32_to_cpu(dentry_hash
) % nbucket
));
568 for (block
= bidx
; block
<= (bidx
+ nblock
- 1); block
++) {
569 dentry_page
= get_new_data_page(dir
, NULL
, block
, true);
570 if (IS_ERR(dentry_page
))
571 return PTR_ERR(dentry_page
);
573 dentry_blk
= kmap(dentry_page
);
574 bit_pos
= room_for_filename(&dentry_blk
->dentry_bitmap
,
575 slots
, NR_DENTRY_IN_BLOCK
);
576 if (bit_pos
< NR_DENTRY_IN_BLOCK
)
580 f2fs_put_page(dentry_page
, 1);
583 /* Move to next level to find the empty slot for new dentry */
587 f2fs_wait_on_page_writeback(dentry_page
, DATA
, true);
590 down_write(&F2FS_I(inode
)->i_sem
);
591 page
= init_inode_metadata(inode
, dir
, new_name
,
597 if (f2fs_encrypted_inode(dir
))
598 file_set_enc_name(inode
);
601 make_dentry_ptr(NULL
, &d
, (void *)dentry_blk
, 1);
602 f2fs_update_dentry(ino
, mode
, &d
, new_name
, dentry_hash
, bit_pos
);
604 set_page_dirty(dentry_page
);
607 f2fs_i_pino_write(inode
, dir
->i_ino
);
608 f2fs_put_page(page
, 1);
611 update_parent_metadata(dir
, inode
, current_depth
);
614 up_write(&F2FS_I(inode
)->i_sem
);
617 f2fs_put_page(dentry_page
, 1);
622 int __f2fs_do_add_link(struct inode
*dir
, struct fscrypt_name
*fname
,
623 struct inode
*inode
, nid_t ino
, umode_t mode
)
625 struct qstr new_name
;
628 new_name
.name
= fname_name(fname
);
629 new_name
.len
= fname_len(fname
);
631 if (f2fs_has_inline_dentry(dir
))
632 err
= f2fs_add_inline_entry(dir
, &new_name
, fname
->usr_fname
,
635 err
= f2fs_add_regular_entry(dir
, &new_name
, fname
->usr_fname
,
638 f2fs_update_time(F2FS_I_SB(dir
), REQ_TIME
);
643 * Caller should grab and release a rwsem by calling f2fs_lock_op() and
646 int __f2fs_add_link(struct inode
*dir
, const struct qstr
*name
,
647 struct inode
*inode
, nid_t ino
, umode_t mode
)
649 struct fscrypt_name fname
;
650 struct page
*page
= NULL
;
651 struct f2fs_dir_entry
*de
= NULL
;
654 err
= fscrypt_setup_filename(dir
, name
, 0, &fname
);
659 * An immature stakable filesystem shows a race condition between lookup
660 * and create. If we have same task when doing lookup and create, it's
661 * definitely fine as expected by VFS normally. Otherwise, let's just
662 * verify on-disk dentry one more time, which guarantees filesystem
665 if (current
!= F2FS_I(dir
)->task
) {
666 de
= __f2fs_find_entry(dir
, &fname
, &page
);
667 F2FS_I(dir
)->task
= NULL
;
670 f2fs_dentry_kunmap(dir
, page
);
671 f2fs_put_page(page
, 0);
673 } else if (IS_ERR(page
)) {
676 err
= __f2fs_do_add_link(dir
, &fname
, inode
, ino
, mode
);
678 fscrypt_free_filename(&fname
);
682 int f2fs_do_tmpfile(struct inode
*inode
, struct inode
*dir
)
687 down_write(&F2FS_I(inode
)->i_sem
);
688 page
= init_inode_metadata(inode
, dir
, NULL
, NULL
, NULL
);
693 f2fs_put_page(page
, 1);
695 clear_inode_flag(inode
, FI_NEW_INODE
);
697 up_write(&F2FS_I(inode
)->i_sem
);
698 f2fs_update_time(F2FS_I_SB(inode
), REQ_TIME
);
702 void f2fs_drop_nlink(struct inode
*dir
, struct inode
*inode
)
704 struct f2fs_sb_info
*sbi
= F2FS_I_SB(dir
);
706 down_write(&F2FS_I(inode
)->i_sem
);
708 if (S_ISDIR(inode
->i_mode
))
709 f2fs_i_links_write(dir
, false);
710 inode
->i_ctime
= current_time(inode
);
712 f2fs_i_links_write(inode
, false);
713 if (S_ISDIR(inode
->i_mode
)) {
714 f2fs_i_links_write(inode
, false);
715 f2fs_i_size_write(inode
, 0);
717 up_write(&F2FS_I(inode
)->i_sem
);
719 if (inode
->i_nlink
== 0)
720 add_orphan_inode(inode
);
722 release_orphan_inode(sbi
);
726 * It only removes the dentry from the dentry page, corresponding name
727 * entry in name page does not need to be touched during deletion.
729 void f2fs_delete_entry(struct f2fs_dir_entry
*dentry
, struct page
*page
,
730 struct inode
*dir
, struct inode
*inode
)
732 struct f2fs_dentry_block
*dentry_blk
;
733 unsigned int bit_pos
;
734 int slots
= GET_DENTRY_SLOTS(le16_to_cpu(dentry
->name_len
));
737 f2fs_update_time(F2FS_I_SB(dir
), REQ_TIME
);
739 if (f2fs_has_inline_dentry(dir
))
740 return f2fs_delete_inline_entry(dentry
, page
, dir
, inode
);
743 f2fs_wait_on_page_writeback(page
, DATA
, true);
745 dentry_blk
= page_address(page
);
746 bit_pos
= dentry
- dentry_blk
->dentry
;
747 for (i
= 0; i
< slots
; i
++)
748 clear_bit_le(bit_pos
+ i
, &dentry_blk
->dentry_bitmap
);
750 /* Let's check and deallocate this dentry page */
751 bit_pos
= find_next_bit_le(&dentry_blk
->dentry_bitmap
,
754 kunmap(page
); /* kunmap - pair of f2fs_find_entry */
755 set_page_dirty(page
);
757 dir
->i_ctime
= dir
->i_mtime
= current_time(dir
);
758 f2fs_mark_inode_dirty_sync(dir
, false);
761 f2fs_drop_nlink(dir
, inode
);
763 if (bit_pos
== NR_DENTRY_IN_BLOCK
&&
764 !truncate_hole(dir
, page
->index
, page
->index
+ 1)) {
765 clear_page_dirty_for_io(page
);
766 ClearPagePrivate(page
);
767 ClearPageUptodate(page
);
768 inode_dec_dirty_pages(dir
);
769 remove_dirty_inode(dir
);
771 f2fs_put_page(page
, 1);
774 bool f2fs_empty_dir(struct inode
*dir
)
777 struct page
*dentry_page
;
778 unsigned int bit_pos
;
779 struct f2fs_dentry_block
*dentry_blk
;
780 unsigned long nblock
= dir_blocks(dir
);
782 if (f2fs_has_inline_dentry(dir
))
783 return f2fs_empty_inline_dir(dir
);
785 for (bidx
= 0; bidx
< nblock
; bidx
++) {
786 dentry_page
= get_lock_data_page(dir
, bidx
, false);
787 if (IS_ERR(dentry_page
)) {
788 if (PTR_ERR(dentry_page
) == -ENOENT
)
794 dentry_blk
= kmap_atomic(dentry_page
);
799 bit_pos
= find_next_bit_le(&dentry_blk
->dentry_bitmap
,
802 kunmap_atomic(dentry_blk
);
804 f2fs_put_page(dentry_page
, 1);
806 if (bit_pos
< NR_DENTRY_IN_BLOCK
)
812 int f2fs_fill_dentries(struct dir_context
*ctx
, struct f2fs_dentry_ptr
*d
,
813 unsigned int start_pos
, struct fscrypt_str
*fstr
)
815 unsigned char d_type
= DT_UNKNOWN
;
816 unsigned int bit_pos
;
817 struct f2fs_dir_entry
*de
= NULL
;
818 struct fscrypt_str de_name
= FSTR_INIT(NULL
, 0);
820 bit_pos
= ((unsigned long)ctx
->pos
% d
->max
);
822 while (bit_pos
< d
->max
) {
823 bit_pos
= find_next_bit_le(d
->bitmap
, d
->max
, bit_pos
);
824 if (bit_pos
>= d
->max
)
827 de
= &d
->dentry
[bit_pos
];
828 if (de
->name_len
== 0) {
830 ctx
->pos
= start_pos
+ bit_pos
;
834 d_type
= get_de_type(de
);
836 de_name
.name
= d
->filename
[bit_pos
];
837 de_name
.len
= le16_to_cpu(de
->name_len
);
839 if (f2fs_encrypted_inode(d
->inode
)) {
840 int save_len
= fstr
->len
;
843 err
= fscrypt_fname_disk_to_usr(d
->inode
,
844 (u32
)de
->hash_code
, 0,
850 fstr
->len
= save_len
;
853 if (!dir_emit(ctx
, de_name
.name
, de_name
.len
,
854 le32_to_cpu(de
->ino
), d_type
))
857 bit_pos
+= GET_DENTRY_SLOTS(le16_to_cpu(de
->name_len
));
858 ctx
->pos
= start_pos
+ bit_pos
;
863 static int f2fs_readdir(struct file
*file
, struct dir_context
*ctx
)
865 struct inode
*inode
= file_inode(file
);
866 unsigned long npages
= dir_blocks(inode
);
867 struct f2fs_dentry_block
*dentry_blk
= NULL
;
868 struct page
*dentry_page
= NULL
;
869 struct file_ra_state
*ra
= &file
->f_ra
;
870 unsigned int n
= ((unsigned long)ctx
->pos
/ NR_DENTRY_IN_BLOCK
);
871 struct f2fs_dentry_ptr d
;
872 struct fscrypt_str fstr
= FSTR_INIT(NULL
, 0);
875 if (f2fs_encrypted_inode(inode
)) {
876 err
= fscrypt_get_encryption_info(inode
);
877 if (err
&& err
!= -ENOKEY
)
880 err
= fscrypt_fname_alloc_buffer(inode
, F2FS_NAME_LEN
, &fstr
);
885 if (f2fs_has_inline_dentry(inode
)) {
886 err
= f2fs_read_inline_dir(file
, ctx
, &fstr
);
890 /* readahead for multi pages of dir */
891 if (npages
- n
> 1 && !ra_has_index(ra
, n
))
892 page_cache_sync_readahead(inode
->i_mapping
, ra
, file
, n
,
893 min(npages
- n
, (pgoff_t
)MAX_DIR_RA_PAGES
));
895 for (; n
< npages
; n
++) {
896 dentry_page
= get_lock_data_page(inode
, n
, false);
897 if (IS_ERR(dentry_page
)) {
898 err
= PTR_ERR(dentry_page
);
899 if (err
== -ENOENT
) {
907 dentry_blk
= kmap(dentry_page
);
909 make_dentry_ptr(inode
, &d
, (void *)dentry_blk
, 1);
911 err
= f2fs_fill_dentries(ctx
, &d
,
912 n
* NR_DENTRY_IN_BLOCK
, &fstr
);
915 f2fs_put_page(dentry_page
, 1);
919 ctx
->pos
= (n
+ 1) * NR_DENTRY_IN_BLOCK
;
921 f2fs_put_page(dentry_page
, 1);
924 fscrypt_fname_free_buffer(&fstr
);
925 return err
< 0 ? err
: 0;
928 static int f2fs_dir_open(struct inode
*inode
, struct file
*filp
)
930 if (f2fs_encrypted_inode(inode
))
931 return fscrypt_get_encryption_info(inode
) ? -EACCES
: 0;
935 const struct file_operations f2fs_dir_operations
= {
936 .llseek
= generic_file_llseek
,
937 .read
= generic_read_dir
,
938 .iterate_shared
= f2fs_readdir
,
939 .fsync
= f2fs_sync_file
,
940 .open
= f2fs_dir_open
,
941 .unlocked_ioctl
= f2fs_ioctl
,
943 .compat_ioctl
= f2fs_compat_ioctl
,