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_block(NULL, &d, dentry_blk);
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;
117 while (bit_pos < d->max) {
118 if (!test_bit_le(bit_pos, d->bitmap)) {
124 de = &d->dentry[bit_pos];
126 if (unlikely(!de->name_len)) {
131 if (de->hash_code == namehash &&
132 fscrypt_match_name(fname, d->filename[bit_pos],
133 le16_to_cpu(de->name_len)))
136 if (max_slots && max_len > *max_slots)
137 *max_slots = max_len;
140 bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
145 if (max_slots && max_len > *max_slots)
146 *max_slots = max_len;
150 static struct f2fs_dir_entry *find_in_level(struct inode *dir,
152 struct fscrypt_name *fname,
153 struct page **res_page)
155 struct qstr name = FSTR_TO_QSTR(&fname->disk_name);
156 int s = GET_DENTRY_SLOTS(name.len);
157 unsigned int nbucket, nblock;
158 unsigned int bidx, end_block;
159 struct page *dentry_page;
160 struct f2fs_dir_entry *de = NULL;
163 f2fs_hash_t namehash = f2fs_dentry_hash(&name, fname);
165 nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level);
166 nblock = bucket_blocks(level);
168 bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level,
169 le32_to_cpu(namehash) % nbucket);
170 end_block = bidx + nblock;
172 for (; bidx < end_block; bidx++) {
173 /* no need to allocate new dentry pages to all the indices */
174 dentry_page = find_data_page(dir, bidx);
175 if (IS_ERR(dentry_page)) {
176 if (PTR_ERR(dentry_page) == -ENOENT) {
180 *res_page = dentry_page;
185 de = find_in_block(dentry_page, fname, namehash, &max_slots,
192 f2fs_put_page(dentry_page, 0);
195 if (!de && room && F2FS_I(dir)->chash != namehash) {
196 F2FS_I(dir)->chash = namehash;
197 F2FS_I(dir)->clevel = level;
203 struct f2fs_dir_entry *__f2fs_find_entry(struct inode *dir,
204 struct fscrypt_name *fname, struct page **res_page)
206 unsigned long npages = dir_blocks(dir);
207 struct f2fs_dir_entry *de = NULL;
208 unsigned int max_depth;
211 if (f2fs_has_inline_dentry(dir)) {
213 de = find_in_inline_dir(dir, fname, res_page);
222 max_depth = F2FS_I(dir)->i_current_depth;
223 if (unlikely(max_depth > MAX_DIR_HASH_DEPTH)) {
224 f2fs_msg(F2FS_I_SB(dir)->sb, KERN_WARNING,
225 "Corrupted max_depth of %lu: %u",
226 dir->i_ino, max_depth);
227 max_depth = MAX_DIR_HASH_DEPTH;
228 f2fs_i_depth_write(dir, max_depth);
231 for (level = 0; level < max_depth; level++) {
233 de = find_in_level(dir, level, fname, res_page);
234 if (de || IS_ERR(*res_page))
238 /* This is to increase the speed of f2fs_create */
240 F2FS_I(dir)->task = current;
245 * Find an entry in the specified directory with the wanted name.
246 * It returns the page where the entry was found (as a parameter - res_page),
247 * and the entry itself. Page is returned mapped and unlocked.
248 * Entry is guaranteed to be valid.
250 struct f2fs_dir_entry *f2fs_find_entry(struct inode *dir,
251 const struct qstr *child, struct page **res_page)
253 struct f2fs_dir_entry *de = NULL;
254 struct fscrypt_name fname;
257 err = fscrypt_setup_filename(dir, child, 1, &fname);
262 *res_page = ERR_PTR(err);
266 de = __f2fs_find_entry(dir, &fname, res_page);
268 fscrypt_free_filename(&fname);
272 struct f2fs_dir_entry *f2fs_parent_dir(struct inode *dir, struct page **p)
274 struct qstr dotdot = QSTR_INIT("..", 2);
276 return f2fs_find_entry(dir, &dotdot, p);
279 ino_t f2fs_inode_by_name(struct inode *dir, const struct qstr *qstr,
283 struct f2fs_dir_entry *de;
285 de = f2fs_find_entry(dir, qstr, page);
287 res = le32_to_cpu(de->ino);
288 f2fs_dentry_kunmap(dir, *page);
289 f2fs_put_page(*page, 0);
295 void f2fs_set_link(struct inode *dir, struct f2fs_dir_entry *de,
296 struct page *page, struct inode *inode)
298 enum page_type type = f2fs_has_inline_dentry(dir) ? NODE : DATA;
300 f2fs_wait_on_page_writeback(page, type, true);
301 de->ino = cpu_to_le32(inode->i_ino);
302 set_de_type(de, inode->i_mode);
303 f2fs_dentry_kunmap(dir, page);
304 set_page_dirty(page);
306 dir->i_mtime = dir->i_ctime = current_time(dir);
307 f2fs_mark_inode_dirty_sync(dir, false);
308 f2fs_put_page(page, 1);
311 static void init_dent_inode(const struct qstr *name, struct page *ipage)
313 struct f2fs_inode *ri;
315 f2fs_wait_on_page_writeback(ipage, NODE, true);
317 /* copy name info. to this inode page */
318 ri = F2FS_INODE(ipage);
319 ri->i_namelen = cpu_to_le32(name->len);
320 memcpy(ri->i_name, name->name, name->len);
321 set_page_dirty(ipage);
324 void do_make_empty_dir(struct inode *inode, struct inode *parent,
325 struct f2fs_dentry_ptr *d)
327 struct qstr dot = QSTR_INIT(".", 1);
328 struct qstr dotdot = QSTR_INIT("..", 2);
330 /* update dirent of "." */
331 f2fs_update_dentry(inode->i_ino, inode->i_mode, d, &dot, 0, 0);
333 /* update dirent of ".." */
334 f2fs_update_dentry(parent->i_ino, parent->i_mode, d, &dotdot, 0, 1);
337 static int make_empty_dir(struct inode *inode,
338 struct inode *parent, struct page *page)
340 struct page *dentry_page;
341 struct f2fs_dentry_block *dentry_blk;
342 struct f2fs_dentry_ptr d;
344 if (f2fs_has_inline_dentry(inode))
345 return make_empty_inline_dir(inode, parent, page);
347 dentry_page = get_new_data_page(inode, page, 0, true);
348 if (IS_ERR(dentry_page))
349 return PTR_ERR(dentry_page);
351 dentry_blk = kmap_atomic(dentry_page);
353 make_dentry_ptr_block(NULL, &d, dentry_blk);
354 do_make_empty_dir(inode, parent, &d);
356 kunmap_atomic(dentry_blk);
358 set_page_dirty(dentry_page);
359 f2fs_put_page(dentry_page, 1);
363 struct page *init_inode_metadata(struct inode *inode, struct inode *dir,
364 const struct qstr *new_name, const struct qstr *orig_name,
370 if (is_inode_flag_set(inode, FI_NEW_INODE)) {
371 page = new_inode_page(inode);
375 if (S_ISDIR(inode->i_mode)) {
376 /* in order to handle error case */
378 err = make_empty_dir(inode, dir, page);
386 err = f2fs_init_acl(inode, dir, page, dpage);
390 err = f2fs_init_security(inode, dir, orig_name, page);
394 if (f2fs_encrypted_inode(dir) && f2fs_may_encrypt(inode)) {
395 err = fscrypt_inherit_context(dir, inode, page, false);
400 page = get_node_page(F2FS_I_SB(dir), inode->i_ino);
404 set_cold_node(inode, page);
408 init_dent_inode(new_name, page);
409 if (f2fs_encrypted_inode(dir))
410 file_set_enc_name(inode);
414 * This file should be checkpointed during fsync.
415 * We lost i_pino from now on.
417 if (is_inode_flag_set(inode, FI_INC_LINK)) {
418 if (!S_ISDIR(inode->i_mode))
419 file_lost_pino(inode);
421 * If link the tmpfile to alias through linkat path,
422 * we should remove this inode from orphan list.
424 if (inode->i_nlink == 0)
425 remove_orphan_inode(F2FS_I_SB(dir), inode->i_ino);
426 f2fs_i_links_write(inode, true);
432 update_inode(inode, page);
433 f2fs_put_page(page, 1);
437 void update_parent_metadata(struct inode *dir, struct inode *inode,
438 unsigned int current_depth)
440 if (inode && is_inode_flag_set(inode, FI_NEW_INODE)) {
441 if (S_ISDIR(inode->i_mode))
442 f2fs_i_links_write(dir, true);
443 clear_inode_flag(inode, FI_NEW_INODE);
445 dir->i_mtime = dir->i_ctime = current_time(dir);
446 f2fs_mark_inode_dirty_sync(dir, false);
448 if (F2FS_I(dir)->i_current_depth != current_depth)
449 f2fs_i_depth_write(dir, current_depth);
451 if (inode && is_inode_flag_set(inode, FI_INC_LINK))
452 clear_inode_flag(inode, FI_INC_LINK);
455 int room_for_filename(const void *bitmap, int slots, int max_slots)
458 int zero_start, zero_end;
460 zero_start = find_next_zero_bit_le(bitmap, max_slots, bit_start);
461 if (zero_start >= max_slots)
464 zero_end = find_next_bit_le(bitmap, max_slots, zero_start);
465 if (zero_end - zero_start >= slots)
468 bit_start = zero_end + 1;
470 if (zero_end + 1 >= max_slots)
475 void f2fs_update_dentry(nid_t ino, umode_t mode, struct f2fs_dentry_ptr *d,
476 const struct qstr *name, f2fs_hash_t name_hash,
477 unsigned int bit_pos)
479 struct f2fs_dir_entry *de;
480 int slots = GET_DENTRY_SLOTS(name->len);
483 de = &d->dentry[bit_pos];
484 de->hash_code = name_hash;
485 de->name_len = cpu_to_le16(name->len);
486 memcpy(d->filename[bit_pos], name->name, name->len);
487 de->ino = cpu_to_le32(ino);
488 set_de_type(de, mode);
489 for (i = 0; i < slots; i++) {
490 __set_bit_le(bit_pos + i, (void *)d->bitmap);
491 /* avoid wrong garbage data for readdir */
493 (de + i)->name_len = 0;
497 int f2fs_add_regular_entry(struct inode *dir, const struct qstr *new_name,
498 const struct qstr *orig_name,
499 struct inode *inode, nid_t ino, umode_t mode)
501 unsigned int bit_pos;
503 unsigned int current_depth;
504 unsigned long bidx, block;
505 f2fs_hash_t dentry_hash;
506 unsigned int nbucket, nblock;
507 struct page *dentry_page = NULL;
508 struct f2fs_dentry_block *dentry_blk = NULL;
509 struct f2fs_dentry_ptr d;
510 struct page *page = NULL;
514 slots = GET_DENTRY_SLOTS(new_name->len);
515 dentry_hash = f2fs_dentry_hash(new_name, NULL);
517 current_depth = F2FS_I(dir)->i_current_depth;
518 if (F2FS_I(dir)->chash == dentry_hash) {
519 level = F2FS_I(dir)->clevel;
520 F2FS_I(dir)->chash = 0;
524 #ifdef CONFIG_F2FS_FAULT_INJECTION
525 if (time_to_inject(F2FS_I_SB(dir), FAULT_DIR_DEPTH)) {
526 f2fs_show_injection_info(FAULT_DIR_DEPTH);
530 if (unlikely(current_depth == MAX_DIR_HASH_DEPTH))
533 /* Increase the depth, if required */
534 if (level == current_depth)
537 nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level);
538 nblock = bucket_blocks(level);
540 bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level,
541 (le32_to_cpu(dentry_hash) % nbucket));
543 for (block = bidx; block <= (bidx + nblock - 1); block++) {
544 dentry_page = get_new_data_page(dir, NULL, block, true);
545 if (IS_ERR(dentry_page))
546 return PTR_ERR(dentry_page);
548 dentry_blk = kmap(dentry_page);
549 bit_pos = room_for_filename(&dentry_blk->dentry_bitmap,
550 slots, NR_DENTRY_IN_BLOCK);
551 if (bit_pos < NR_DENTRY_IN_BLOCK)
555 f2fs_put_page(dentry_page, 1);
558 /* Move to next level to find the empty slot for new dentry */
562 f2fs_wait_on_page_writeback(dentry_page, DATA, true);
565 down_write(&F2FS_I(inode)->i_sem);
566 page = init_inode_metadata(inode, dir, new_name,
574 make_dentry_ptr_block(NULL, &d, dentry_blk);
575 f2fs_update_dentry(ino, mode, &d, new_name, dentry_hash, bit_pos);
577 set_page_dirty(dentry_page);
580 f2fs_i_pino_write(inode, dir->i_ino);
581 f2fs_put_page(page, 1);
584 update_parent_metadata(dir, inode, current_depth);
587 up_write(&F2FS_I(inode)->i_sem);
590 f2fs_put_page(dentry_page, 1);
595 int __f2fs_do_add_link(struct inode *dir, struct fscrypt_name *fname,
596 struct inode *inode, nid_t ino, umode_t mode)
598 struct qstr new_name;
601 new_name.name = fname_name(fname);
602 new_name.len = fname_len(fname);
604 if (f2fs_has_inline_dentry(dir))
605 err = f2fs_add_inline_entry(dir, &new_name, fname->usr_fname,
608 err = f2fs_add_regular_entry(dir, &new_name, fname->usr_fname,
611 f2fs_update_time(F2FS_I_SB(dir), REQ_TIME);
616 * Caller should grab and release a rwsem by calling f2fs_lock_op() and
619 int __f2fs_add_link(struct inode *dir, const struct qstr *name,
620 struct inode *inode, nid_t ino, umode_t mode)
622 struct fscrypt_name fname;
623 struct page *page = NULL;
624 struct f2fs_dir_entry *de = NULL;
627 err = fscrypt_setup_filename(dir, name, 0, &fname);
632 * An immature stakable filesystem shows a race condition between lookup
633 * and create. If we have same task when doing lookup and create, it's
634 * definitely fine as expected by VFS normally. Otherwise, let's just
635 * verify on-disk dentry one more time, which guarantees filesystem
638 if (current != F2FS_I(dir)->task) {
639 de = __f2fs_find_entry(dir, &fname, &page);
640 F2FS_I(dir)->task = NULL;
643 f2fs_dentry_kunmap(dir, page);
644 f2fs_put_page(page, 0);
646 } else if (IS_ERR(page)) {
649 err = __f2fs_do_add_link(dir, &fname, inode, ino, mode);
651 fscrypt_free_filename(&fname);
655 int f2fs_do_tmpfile(struct inode *inode, struct inode *dir)
660 down_write(&F2FS_I(inode)->i_sem);
661 page = init_inode_metadata(inode, dir, NULL, NULL, NULL);
666 f2fs_put_page(page, 1);
668 clear_inode_flag(inode, FI_NEW_INODE);
670 up_write(&F2FS_I(inode)->i_sem);
671 f2fs_update_time(F2FS_I_SB(inode), REQ_TIME);
675 void f2fs_drop_nlink(struct inode *dir, struct inode *inode)
677 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
679 down_write(&F2FS_I(inode)->i_sem);
681 if (S_ISDIR(inode->i_mode))
682 f2fs_i_links_write(dir, false);
683 inode->i_ctime = current_time(inode);
685 f2fs_i_links_write(inode, false);
686 if (S_ISDIR(inode->i_mode)) {
687 f2fs_i_links_write(inode, false);
688 f2fs_i_size_write(inode, 0);
690 up_write(&F2FS_I(inode)->i_sem);
692 if (inode->i_nlink == 0)
693 add_orphan_inode(inode);
695 release_orphan_inode(sbi);
699 * It only removes the dentry from the dentry page, corresponding name
700 * entry in name page does not need to be touched during deletion.
702 void f2fs_delete_entry(struct f2fs_dir_entry *dentry, struct page *page,
703 struct inode *dir, struct inode *inode)
705 struct f2fs_dentry_block *dentry_blk;
706 unsigned int bit_pos;
707 int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len));
708 struct address_space *mapping = page_mapping(page);
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(dir);
733 f2fs_mark_inode_dirty_sync(dir, false);
736 f2fs_drop_nlink(dir, inode);
738 if (bit_pos == NR_DENTRY_IN_BLOCK &&
739 !truncate_hole(dir, page->index, page->index + 1)) {
740 spin_lock_irqsave(&mapping->tree_lock, flags);
741 radix_tree_tag_clear(&mapping->page_tree, page_index(page),
742 PAGECACHE_TAG_DIRTY);
743 spin_unlock_irqrestore(&mapping->tree_lock, flags);
745 clear_page_dirty_for_io(page);
746 ClearPagePrivate(page);
747 ClearPageUptodate(page);
748 clear_cold_data(page);
749 inode_dec_dirty_pages(dir);
750 remove_dirty_inode(dir);
752 f2fs_put_page(page, 1);
755 bool f2fs_empty_dir(struct inode *dir)
758 struct page *dentry_page;
759 unsigned int bit_pos;
760 struct f2fs_dentry_block *dentry_blk;
761 unsigned long nblock = dir_blocks(dir);
763 if (f2fs_has_inline_dentry(dir))
764 return f2fs_empty_inline_dir(dir);
766 for (bidx = 0; bidx < nblock; bidx++) {
767 dentry_page = get_lock_data_page(dir, bidx, false);
768 if (IS_ERR(dentry_page)) {
769 if (PTR_ERR(dentry_page) == -ENOENT)
775 dentry_blk = kmap_atomic(dentry_page);
780 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
783 kunmap_atomic(dentry_blk);
785 f2fs_put_page(dentry_page, 1);
787 if (bit_pos < NR_DENTRY_IN_BLOCK)
793 int f2fs_fill_dentries(struct dir_context *ctx, struct f2fs_dentry_ptr *d,
794 unsigned int start_pos, struct fscrypt_str *fstr)
796 unsigned char d_type = DT_UNKNOWN;
797 unsigned int bit_pos;
798 struct f2fs_dir_entry *de = NULL;
799 struct fscrypt_str de_name = FSTR_INIT(NULL, 0);
801 bit_pos = ((unsigned long)ctx->pos % d->max);
803 while (bit_pos < d->max) {
804 bit_pos = find_next_bit_le(d->bitmap, d->max, bit_pos);
805 if (bit_pos >= d->max)
808 de = &d->dentry[bit_pos];
809 if (de->name_len == 0) {
811 ctx->pos = start_pos + bit_pos;
815 d_type = get_de_type(de);
817 de_name.name = d->filename[bit_pos];
818 de_name.len = le16_to_cpu(de->name_len);
820 /* check memory boundary before moving forward */
821 bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
822 if (unlikely(bit_pos > d->max ||
823 le16_to_cpu(de->name_len) > F2FS_NAME_LEN)) {
824 f2fs_msg(F2FS_I_SB(d->inode)->sb, KERN_WARNING,
825 "%s: corrupted namelen=%d, run fsck to fix.",
826 __func__, le16_to_cpu(de->name_len));
827 set_sbi_flag(F2FS_I_SB(d->inode)->sb->s_fs_info, SBI_NEED_FSCK);
831 if (f2fs_encrypted_inode(d->inode)) {
832 int save_len = fstr->len;
835 err = fscrypt_fname_disk_to_usr(d->inode,
836 (u32)de->hash_code, 0,
842 fstr->len = save_len;
845 if (!dir_emit(ctx, de_name.name, de_name.len,
846 le32_to_cpu(de->ino), d_type))
849 ctx->pos = start_pos + bit_pos;
854 static int f2fs_readdir(struct file *file, struct dir_context *ctx)
856 struct inode *inode = file_inode(file);
857 unsigned long npages = dir_blocks(inode);
858 struct f2fs_dentry_block *dentry_blk = NULL;
859 struct page *dentry_page = NULL;
860 struct file_ra_state *ra = &file->f_ra;
861 unsigned int n = ((unsigned long)ctx->pos / NR_DENTRY_IN_BLOCK);
862 struct f2fs_dentry_ptr d;
863 struct fscrypt_str fstr = FSTR_INIT(NULL, 0);
866 if (f2fs_encrypted_inode(inode)) {
867 err = fscrypt_get_encryption_info(inode);
868 if (err && err != -ENOKEY)
871 err = fscrypt_fname_alloc_buffer(inode, F2FS_NAME_LEN, &fstr);
876 if (f2fs_has_inline_dentry(inode)) {
877 err = f2fs_read_inline_dir(file, ctx, &fstr);
881 /* readahead for multi pages of dir */
882 if (npages - n > 1 && !ra_has_index(ra, n))
883 page_cache_sync_readahead(inode->i_mapping, ra, file, n,
884 min(npages - n, (pgoff_t)MAX_DIR_RA_PAGES));
886 for (; n < npages; n++) {
887 dentry_page = get_lock_data_page(inode, n, false);
888 if (IS_ERR(dentry_page)) {
889 err = PTR_ERR(dentry_page);
890 if (err == -ENOENT) {
898 dentry_blk = kmap(dentry_page);
900 make_dentry_ptr_block(inode, &d, dentry_blk);
902 err = f2fs_fill_dentries(ctx, &d,
903 n * NR_DENTRY_IN_BLOCK, &fstr);
906 f2fs_put_page(dentry_page, 1);
910 ctx->pos = (n + 1) * NR_DENTRY_IN_BLOCK;
912 f2fs_put_page(dentry_page, 1);
915 fscrypt_fname_free_buffer(&fstr);
916 return err < 0 ? err : 0;
919 static int f2fs_dir_open(struct inode *inode, struct file *filp)
921 if (f2fs_encrypted_inode(inode))
922 return fscrypt_get_encryption_info(inode) ? -EACCES : 0;
926 const struct file_operations f2fs_dir_operations = {
927 .llseek = generic_file_llseek,
928 .read = generic_read_dir,
929 .iterate_shared = f2fs_readdir,
930 .fsync = f2fs_sync_file,
931 .open = f2fs_dir_open,
932 .unlocked_ioctl = f2fs_ioctl,
934 .compat_ioctl = f2fs_compat_ioctl,