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 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
== 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
;
175 namehash
= f2fs_dentry_hash(&name
);
177 nbucket
= dir_buckets(level
, F2FS_I(dir
)->i_dir_level
);
178 nblock
= bucket_blocks(level
);
180 bidx
= dir_block_index(level
, F2FS_I(dir
)->i_dir_level
,
181 le32_to_cpu(namehash
) % nbucket
);
182 end_block
= bidx
+ nblock
;
184 for (; bidx
< end_block
; bidx
++) {
185 /* no need to allocate new dentry pages to all the indices */
186 dentry_page
= find_data_page(dir
, bidx
);
187 if (IS_ERR(dentry_page
)) {
192 de
= find_in_block(dentry_page
, fname
, namehash
, &max_slots
,
199 f2fs_put_page(dentry_page
, 0);
202 if (!de
&& room
&& F2FS_I(dir
)->chash
!= namehash
) {
203 F2FS_I(dir
)->chash
= namehash
;
204 F2FS_I(dir
)->clevel
= level
;
211 * Find an entry in the specified directory with the wanted name.
212 * It returns the page where the entry was found (as a parameter - res_page),
213 * and the entry itself. Page is returned mapped and unlocked.
214 * Entry is guaranteed to be valid.
216 struct f2fs_dir_entry
*f2fs_find_entry(struct inode
*dir
,
217 struct qstr
*child
, struct page
**res_page
)
219 unsigned long npages
= dir_blocks(dir
);
220 struct f2fs_dir_entry
*de
= NULL
;
221 unsigned int max_depth
;
223 struct fscrypt_name fname
;
228 err
= fscrypt_setup_filename(dir
, child
, 1, &fname
);
232 if (f2fs_has_inline_dentry(dir
)) {
233 de
= find_in_inline_dir(dir
, &fname
, res_page
);
240 max_depth
= F2FS_I(dir
)->i_current_depth
;
241 if (unlikely(max_depth
> MAX_DIR_HASH_DEPTH
)) {
242 f2fs_msg(F2FS_I_SB(dir
)->sb
, KERN_WARNING
,
243 "Corrupted max_depth of %lu: %u",
244 dir
->i_ino
, max_depth
);
245 max_depth
= MAX_DIR_HASH_DEPTH
;
246 F2FS_I(dir
)->i_current_depth
= max_depth
;
247 mark_inode_dirty(dir
);
250 for (level
= 0; level
< max_depth
; level
++) {
251 de
= find_in_level(dir
, level
, &fname
, res_page
);
256 fscrypt_free_filename(&fname
);
260 struct f2fs_dir_entry
*f2fs_parent_dir(struct inode
*dir
, struct page
**p
)
263 struct f2fs_dir_entry
*de
;
264 struct f2fs_dentry_block
*dentry_blk
;
266 if (f2fs_has_inline_dentry(dir
))
267 return f2fs_parent_inline_dir(dir
, p
);
269 page
= get_lock_data_page(dir
, 0, false);
273 dentry_blk
= kmap(page
);
274 de
= &dentry_blk
->dentry
[1];
280 ino_t
f2fs_inode_by_name(struct inode
*dir
, struct qstr
*qstr
)
283 struct f2fs_dir_entry
*de
;
286 de
= f2fs_find_entry(dir
, qstr
, &page
);
288 res
= le32_to_cpu(de
->ino
);
289 f2fs_dentry_kunmap(dir
, page
);
290 f2fs_put_page(page
, 0);
296 void f2fs_set_link(struct inode
*dir
, struct f2fs_dir_entry
*de
,
297 struct page
*page
, struct inode
*inode
)
299 enum page_type type
= f2fs_has_inline_dentry(dir
) ? NODE
: DATA
;
301 f2fs_wait_on_page_writeback(page
, type
, true);
302 de
->ino
= cpu_to_le32(inode
->i_ino
);
303 set_de_type(de
, inode
->i_mode
);
304 f2fs_dentry_kunmap(dir
, page
);
305 set_page_dirty(page
);
306 dir
->i_mtime
= dir
->i_ctime
= CURRENT_TIME
;
307 mark_inode_dirty(dir
);
309 f2fs_put_page(page
, 1);
312 static void init_dent_inode(const struct qstr
*name
, struct page
*ipage
)
314 struct f2fs_inode
*ri
;
316 f2fs_wait_on_page_writeback(ipage
, NODE
, true);
318 /* copy name info. to this inode page */
319 ri
= F2FS_INODE(ipage
);
320 ri
->i_namelen
= cpu_to_le32(name
->len
);
321 memcpy(ri
->i_name
, name
->name
, name
->len
);
322 set_page_dirty(ipage
);
325 int update_dent_inode(struct inode
*inode
, struct inode
*to
,
326 const struct qstr
*name
)
330 if (file_enc_name(to
))
333 page
= get_node_page(F2FS_I_SB(inode
), inode
->i_ino
);
335 return PTR_ERR(page
);
337 init_dent_inode(name
, page
);
338 f2fs_put_page(page
, 1);
343 void do_make_empty_dir(struct inode
*inode
, struct inode
*parent
,
344 struct f2fs_dentry_ptr
*d
)
346 struct qstr dot
= QSTR_INIT(".", 1);
347 struct qstr dotdot
= QSTR_INIT("..", 2);
349 /* update dirent of "." */
350 f2fs_update_dentry(inode
->i_ino
, inode
->i_mode
, d
, &dot
, 0, 0);
352 /* update dirent of ".." */
353 f2fs_update_dentry(parent
->i_ino
, parent
->i_mode
, d
, &dotdot
, 0, 1);
356 static int make_empty_dir(struct inode
*inode
,
357 struct inode
*parent
, struct page
*page
)
359 struct page
*dentry_page
;
360 struct f2fs_dentry_block
*dentry_blk
;
361 struct f2fs_dentry_ptr d
;
363 if (f2fs_has_inline_dentry(inode
))
364 return make_empty_inline_dir(inode
, parent
, page
);
366 dentry_page
= get_new_data_page(inode
, page
, 0, true);
367 if (IS_ERR(dentry_page
))
368 return PTR_ERR(dentry_page
);
370 dentry_blk
= kmap_atomic(dentry_page
);
372 make_dentry_ptr(NULL
, &d
, (void *)dentry_blk
, 1);
373 do_make_empty_dir(inode
, parent
, &d
);
375 kunmap_atomic(dentry_blk
);
377 set_page_dirty(dentry_page
);
378 f2fs_put_page(dentry_page
, 1);
382 struct page
*init_inode_metadata(struct inode
*inode
, struct inode
*dir
,
383 const struct qstr
*name
, struct page
*dpage
)
388 if (is_inode_flag_set(F2FS_I(inode
), FI_NEW_INODE
)) {
389 page
= new_inode_page(inode
);
393 if (S_ISDIR(inode
->i_mode
)) {
394 /* in order to handle error case */
396 err
= make_empty_dir(inode
, dir
, page
);
404 err
= f2fs_init_acl(inode
, dir
, page
, dpage
);
408 err
= f2fs_init_security(inode
, dir
, name
, page
);
412 if (f2fs_encrypted_inode(dir
) && f2fs_may_encrypt(inode
)) {
413 err
= fscrypt_inherit_context(dir
, inode
, page
, false);
418 page
= get_node_page(F2FS_I_SB(dir
), inode
->i_ino
);
422 set_cold_node(inode
, page
);
426 init_dent_inode(name
, page
);
429 * This file should be checkpointed during fsync.
430 * We lost i_pino from now on.
432 if (is_inode_flag_set(F2FS_I(inode
), FI_INC_LINK
)) {
433 file_lost_pino(inode
);
435 * If link the tmpfile to alias through linkat path,
436 * we should remove this inode from orphan list.
438 if (inode
->i_nlink
== 0)
439 remove_orphan_inode(F2FS_I_SB(dir
), inode
->i_ino
);
445 /* truncate empty dir pages */
446 truncate_inode_pages(&inode
->i_data
, 0);
449 update_inode(inode
, page
);
450 f2fs_put_page(page
, 1);
454 void update_parent_metadata(struct inode
*dir
, struct inode
*inode
,
455 unsigned int current_depth
)
457 if (inode
&& is_inode_flag_set(F2FS_I(inode
), FI_NEW_INODE
)) {
458 if (S_ISDIR(inode
->i_mode
)) {
460 set_inode_flag(F2FS_I(dir
), FI_UPDATE_DIR
);
462 clear_inode_flag(F2FS_I(inode
), FI_NEW_INODE
);
464 dir
->i_mtime
= dir
->i_ctime
= CURRENT_TIME
;
465 mark_inode_dirty(dir
);
467 if (F2FS_I(dir
)->i_current_depth
!= current_depth
) {
468 F2FS_I(dir
)->i_current_depth
= current_depth
;
469 set_inode_flag(F2FS_I(dir
), FI_UPDATE_DIR
);
472 if (inode
&& is_inode_flag_set(F2FS_I(inode
), FI_INC_LINK
))
473 clear_inode_flag(F2FS_I(inode
), FI_INC_LINK
);
476 int room_for_filename(const void *bitmap
, int slots
, int max_slots
)
479 int zero_start
, zero_end
;
481 zero_start
= find_next_zero_bit_le(bitmap
, max_slots
, bit_start
);
482 if (zero_start
>= max_slots
)
485 zero_end
= find_next_bit_le(bitmap
, max_slots
, zero_start
);
486 if (zero_end
- zero_start
>= slots
)
489 bit_start
= zero_end
+ 1;
491 if (zero_end
+ 1 >= max_slots
)
496 void f2fs_update_dentry(nid_t ino
, umode_t mode
, struct f2fs_dentry_ptr
*d
,
497 const struct qstr
*name
, f2fs_hash_t name_hash
,
498 unsigned int bit_pos
)
500 struct f2fs_dir_entry
*de
;
501 int slots
= GET_DENTRY_SLOTS(name
->len
);
504 de
= &d
->dentry
[bit_pos
];
505 de
->hash_code
= name_hash
;
506 de
->name_len
= cpu_to_le16(name
->len
);
507 memcpy(d
->filename
[bit_pos
], name
->name
, name
->len
);
508 de
->ino
= cpu_to_le32(ino
);
509 set_de_type(de
, mode
);
510 for (i
= 0; i
< slots
; i
++) {
511 test_and_set_bit_le(bit_pos
+ i
, (void *)d
->bitmap
);
512 /* avoid wrong garbage data for readdir */
514 (de
+ i
)->name_len
= 0;
518 int f2fs_add_regular_entry(struct inode
*dir
, const struct qstr
*new_name
,
519 struct inode
*inode
, nid_t ino
, umode_t mode
)
521 unsigned int bit_pos
;
523 unsigned int current_depth
;
524 unsigned long bidx
, block
;
525 f2fs_hash_t dentry_hash
;
526 unsigned int nbucket
, nblock
;
527 struct page
*dentry_page
= NULL
;
528 struct f2fs_dentry_block
*dentry_blk
= NULL
;
529 struct f2fs_dentry_ptr d
;
530 struct page
*page
= NULL
;
534 slots
= GET_DENTRY_SLOTS(new_name
->len
);
535 dentry_hash
= f2fs_dentry_hash(new_name
);
537 current_depth
= F2FS_I(dir
)->i_current_depth
;
538 if (F2FS_I(dir
)->chash
== dentry_hash
) {
539 level
= F2FS_I(dir
)->clevel
;
540 F2FS_I(dir
)->chash
= 0;
544 #ifdef CONFIG_F2FS_FAULT_INJECTION
545 if (time_to_inject(FAULT_DIR_DEPTH
))
548 if (unlikely(current_depth
== MAX_DIR_HASH_DEPTH
))
551 /* Increase the depth, if required */
552 if (level
== current_depth
)
555 nbucket
= dir_buckets(level
, F2FS_I(dir
)->i_dir_level
);
556 nblock
= bucket_blocks(level
);
558 bidx
= dir_block_index(level
, F2FS_I(dir
)->i_dir_level
,
559 (le32_to_cpu(dentry_hash
) % nbucket
));
561 for (block
= bidx
; block
<= (bidx
+ nblock
- 1); block
++) {
562 dentry_page
= get_new_data_page(dir
, NULL
, block
, true);
563 if (IS_ERR(dentry_page
))
564 return PTR_ERR(dentry_page
);
566 dentry_blk
= kmap(dentry_page
);
567 bit_pos
= room_for_filename(&dentry_blk
->dentry_bitmap
,
568 slots
, NR_DENTRY_IN_BLOCK
);
569 if (bit_pos
< NR_DENTRY_IN_BLOCK
)
573 f2fs_put_page(dentry_page
, 1);
576 /* Move to next level to find the empty slot for new dentry */
580 f2fs_wait_on_page_writeback(dentry_page
, DATA
, true);
583 down_write(&F2FS_I(inode
)->i_sem
);
584 page
= init_inode_metadata(inode
, dir
, new_name
, NULL
);
589 if (f2fs_encrypted_inode(dir
))
590 file_set_enc_name(inode
);
593 make_dentry_ptr(NULL
, &d
, (void *)dentry_blk
, 1);
594 f2fs_update_dentry(ino
, mode
, &d
, new_name
, dentry_hash
, bit_pos
);
596 set_page_dirty(dentry_page
);
599 /* we don't need to mark_inode_dirty now */
600 F2FS_I(inode
)->i_pino
= dir
->i_ino
;
601 update_inode(inode
, page
);
602 f2fs_put_page(page
, 1);
605 update_parent_metadata(dir
, inode
, current_depth
);
608 up_write(&F2FS_I(inode
)->i_sem
);
610 if (is_inode_flag_set(F2FS_I(dir
), FI_UPDATE_DIR
)) {
611 update_inode_page(dir
);
612 clear_inode_flag(F2FS_I(dir
), FI_UPDATE_DIR
);
615 f2fs_put_page(dentry_page
, 1);
621 * Caller should grab and release a rwsem by calling f2fs_lock_op() and
624 int __f2fs_add_link(struct inode
*dir
, const struct qstr
*name
,
625 struct inode
*inode
, nid_t ino
, umode_t mode
)
627 struct fscrypt_name fname
;
628 struct qstr new_name
;
631 err
= fscrypt_setup_filename(dir
, name
, 0, &fname
);
635 new_name
.name
= fname_name(&fname
);
636 new_name
.len
= fname_len(&fname
);
639 if (f2fs_has_inline_dentry(dir
))
640 err
= f2fs_add_inline_entry(dir
, &new_name
, inode
, ino
, mode
);
642 err
= f2fs_add_regular_entry(dir
, &new_name
, inode
, ino
, mode
);
644 fscrypt_free_filename(&fname
);
645 f2fs_update_time(F2FS_I_SB(dir
), REQ_TIME
);
649 int f2fs_do_tmpfile(struct inode
*inode
, struct inode
*dir
)
654 down_write(&F2FS_I(inode
)->i_sem
);
655 page
= init_inode_metadata(inode
, dir
, NULL
, NULL
);
660 /* we don't need to mark_inode_dirty now */
661 update_inode(inode
, page
);
662 f2fs_put_page(page
, 1);
664 clear_inode_flag(F2FS_I(inode
), FI_NEW_INODE
);
666 up_write(&F2FS_I(inode
)->i_sem
);
667 f2fs_update_time(F2FS_I_SB(inode
), REQ_TIME
);
671 void f2fs_drop_nlink(struct inode
*dir
, struct inode
*inode
, struct page
*page
)
673 struct f2fs_sb_info
*sbi
= F2FS_I_SB(dir
);
675 down_write(&F2FS_I(inode
)->i_sem
);
677 if (S_ISDIR(inode
->i_mode
)) {
680 update_inode(dir
, page
);
682 update_inode_page(dir
);
684 inode
->i_ctime
= CURRENT_TIME
;
687 if (S_ISDIR(inode
->i_mode
)) {
689 i_size_write(inode
, 0);
691 up_write(&F2FS_I(inode
)->i_sem
);
692 update_inode_page(inode
);
694 if (inode
->i_nlink
== 0)
695 add_orphan_inode(sbi
, inode
->i_ino
);
697 release_orphan_inode(sbi
);
701 * It only removes the dentry from the dentry page, corresponding name
702 * entry in name page does not need to be touched during deletion.
704 void f2fs_delete_entry(struct f2fs_dir_entry
*dentry
, struct page
*page
,
705 struct inode
*dir
, struct inode
*inode
)
707 struct f2fs_dentry_block
*dentry_blk
;
708 unsigned int bit_pos
;
709 int slots
= GET_DENTRY_SLOTS(le16_to_cpu(dentry
->name_len
));
712 f2fs_update_time(F2FS_I_SB(dir
), REQ_TIME
);
714 if (f2fs_has_inline_dentry(dir
))
715 return f2fs_delete_inline_entry(dentry
, page
, dir
, inode
);
718 f2fs_wait_on_page_writeback(page
, DATA
, true);
720 dentry_blk
= page_address(page
);
721 bit_pos
= dentry
- dentry_blk
->dentry
;
722 for (i
= 0; i
< slots
; i
++)
723 clear_bit_le(bit_pos
+ i
, &dentry_blk
->dentry_bitmap
);
725 /* Let's check and deallocate this dentry page */
726 bit_pos
= find_next_bit_le(&dentry_blk
->dentry_bitmap
,
729 kunmap(page
); /* kunmap - pair of f2fs_find_entry */
730 set_page_dirty(page
);
732 dir
->i_ctime
= dir
->i_mtime
= CURRENT_TIME
;
735 f2fs_drop_nlink(dir
, inode
, NULL
);
737 if (bit_pos
== NR_DENTRY_IN_BLOCK
&&
738 !truncate_hole(dir
, page
->index
, page
->index
+ 1)) {
739 clear_page_dirty_for_io(page
);
740 ClearPagePrivate(page
);
741 ClearPageUptodate(page
);
742 inode_dec_dirty_pages(dir
);
744 f2fs_put_page(page
, 1);
747 bool f2fs_empty_dir(struct inode
*dir
)
750 struct page
*dentry_page
;
751 unsigned int bit_pos
;
752 struct f2fs_dentry_block
*dentry_blk
;
753 unsigned long nblock
= dir_blocks(dir
);
755 if (f2fs_has_inline_dentry(dir
))
756 return f2fs_empty_inline_dir(dir
);
758 for (bidx
= 0; bidx
< nblock
; bidx
++) {
759 dentry_page
= get_lock_data_page(dir
, bidx
, false);
760 if (IS_ERR(dentry_page
)) {
761 if (PTR_ERR(dentry_page
) == -ENOENT
)
767 dentry_blk
= kmap_atomic(dentry_page
);
772 bit_pos
= find_next_bit_le(&dentry_blk
->dentry_bitmap
,
775 kunmap_atomic(dentry_blk
);
777 f2fs_put_page(dentry_page
, 1);
779 if (bit_pos
< NR_DENTRY_IN_BLOCK
)
785 bool f2fs_fill_dentries(struct dir_context
*ctx
, struct f2fs_dentry_ptr
*d
,
786 unsigned int start_pos
, struct fscrypt_str
*fstr
)
788 unsigned char d_type
= DT_UNKNOWN
;
789 unsigned int bit_pos
;
790 struct f2fs_dir_entry
*de
= NULL
;
791 struct fscrypt_str de_name
= FSTR_INIT(NULL
, 0);
793 bit_pos
= ((unsigned long)ctx
->pos
% d
->max
);
795 while (bit_pos
< d
->max
) {
796 bit_pos
= find_next_bit_le(d
->bitmap
, d
->max
, bit_pos
);
797 if (bit_pos
>= d
->max
)
800 de
= &d
->dentry
[bit_pos
];
801 if (de
->name_len
== 0) {
803 ctx
->pos
= start_pos
+ bit_pos
;
807 d_type
= get_de_type(de
);
809 de_name
.name
= d
->filename
[bit_pos
];
810 de_name
.len
= le16_to_cpu(de
->name_len
);
812 if (f2fs_encrypted_inode(d
->inode
)) {
813 int save_len
= fstr
->len
;
816 de_name
.name
= f2fs_kmalloc(de_name
.len
, GFP_NOFS
);
820 memcpy(de_name
.name
, d
->filename
[bit_pos
], de_name
.len
);
822 ret
= fscrypt_fname_disk_to_usr(d
->inode
,
823 (u32
)de
->hash_code
, 0,
830 fstr
->len
= save_len
;
833 if (!dir_emit(ctx
, de_name
.name
, de_name
.len
,
834 le32_to_cpu(de
->ino
), d_type
))
837 bit_pos
+= GET_DENTRY_SLOTS(le16_to_cpu(de
->name_len
));
838 ctx
->pos
= start_pos
+ bit_pos
;
843 static int f2fs_readdir(struct file
*file
, struct dir_context
*ctx
)
845 struct inode
*inode
= file_inode(file
);
846 unsigned long npages
= dir_blocks(inode
);
847 struct f2fs_dentry_block
*dentry_blk
= NULL
;
848 struct page
*dentry_page
= NULL
;
849 struct file_ra_state
*ra
= &file
->f_ra
;
850 unsigned int n
= ((unsigned long)ctx
->pos
/ NR_DENTRY_IN_BLOCK
);
851 struct f2fs_dentry_ptr d
;
852 struct fscrypt_str fstr
= FSTR_INIT(NULL
, 0);
855 if (f2fs_encrypted_inode(inode
)) {
856 err
= fscrypt_get_encryption_info(inode
);
857 if (err
&& err
!= -ENOKEY
)
860 err
= fscrypt_fname_alloc_buffer(inode
, F2FS_NAME_LEN
, &fstr
);
865 if (f2fs_has_inline_dentry(inode
)) {
866 err
= f2fs_read_inline_dir(file
, ctx
, &fstr
);
870 /* readahead for multi pages of dir */
871 if (npages
- n
> 1 && !ra_has_index(ra
, n
))
872 page_cache_sync_readahead(inode
->i_mapping
, ra
, file
, n
,
873 min(npages
- n
, (pgoff_t
)MAX_DIR_RA_PAGES
));
875 for (; n
< npages
; n
++) {
876 dentry_page
= get_lock_data_page(inode
, n
, false);
877 if (IS_ERR(dentry_page
)) {
878 err
= PTR_ERR(dentry_page
);
885 dentry_blk
= kmap(dentry_page
);
887 make_dentry_ptr(inode
, &d
, (void *)dentry_blk
, 1);
889 if (f2fs_fill_dentries(ctx
, &d
, n
* NR_DENTRY_IN_BLOCK
, &fstr
)) {
891 f2fs_put_page(dentry_page
, 1);
895 ctx
->pos
= (n
+ 1) * NR_DENTRY_IN_BLOCK
;
897 f2fs_put_page(dentry_page
, 1);
901 fscrypt_fname_free_buffer(&fstr
);
905 static int f2fs_dir_open(struct inode
*inode
, struct file
*filp
)
907 if (f2fs_encrypted_inode(inode
))
908 return fscrypt_get_encryption_info(inode
) ? -EACCES
: 0;
912 const struct file_operations f2fs_dir_operations
= {
913 .llseek
= generic_file_llseek
,
914 .read
= generic_read_dir
,
915 .iterate_shared
= f2fs_readdir
,
916 .fsync
= f2fs_sync_file
,
917 .open
= f2fs_dir_open
,
918 .unlocked_ioctl
= f2fs_ioctl
,
920 .compat_ioctl
= f2fs_compat_ioctl
,