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)) {
188 if (PTR_ERR(dentry_page) == -ENOENT) {
192 *res_page = dentry_page;
197 de = find_in_block(dentry_page, fname, namehash, &max_slots,
204 f2fs_put_page(dentry_page, 0);
207 if (!de && room && F2FS_I(dir)->chash != namehash) {
208 F2FS_I(dir)->chash = namehash;
209 F2FS_I(dir)->clevel = level;
216 * Find an entry in the specified directory with the wanted name.
217 * It returns the page where the entry was found (as a parameter - res_page),
218 * and the entry itself. Page is returned mapped and unlocked.
219 * Entry is guaranteed to be valid.
221 struct f2fs_dir_entry *f2fs_find_entry(struct inode *dir,
222 struct qstr *child, struct page **res_page)
224 unsigned long npages = dir_blocks(dir);
225 struct f2fs_dir_entry *de = NULL;
226 unsigned int max_depth;
228 struct fscrypt_name fname;
231 err = fscrypt_setup_filename(dir, child, 1, &fname);
233 *res_page = ERR_PTR(err);
237 if (f2fs_has_inline_dentry(dir)) {
239 de = find_in_inline_dir(dir, &fname, res_page);
248 max_depth = F2FS_I(dir)->i_current_depth;
249 if (unlikely(max_depth > MAX_DIR_HASH_DEPTH)) {
250 f2fs_msg(F2FS_I_SB(dir)->sb, KERN_WARNING,
251 "Corrupted max_depth of %lu: %u",
252 dir->i_ino, max_depth);
253 max_depth = MAX_DIR_HASH_DEPTH;
254 f2fs_i_depth_write(dir, max_depth);
257 for (level = 0; level < max_depth; level++) {
259 de = find_in_level(dir, level, &fname, res_page);
260 if (de || IS_ERR(*res_page))
264 fscrypt_free_filename(&fname);
268 struct f2fs_dir_entry *f2fs_parent_dir(struct inode *dir, struct page **p)
271 struct f2fs_dir_entry *de;
272 struct f2fs_dentry_block *dentry_blk;
274 if (f2fs_has_inline_dentry(dir))
275 return f2fs_parent_inline_dir(dir, p);
277 page = get_lock_data_page(dir, 0, false);
281 dentry_blk = kmap(page);
282 de = &dentry_blk->dentry[1];
288 ino_t f2fs_inode_by_name(struct inode *dir, struct qstr *qstr)
291 struct f2fs_dir_entry *de;
294 de = f2fs_find_entry(dir, qstr, &page);
296 res = le32_to_cpu(de->ino);
297 f2fs_dentry_kunmap(dir, page);
298 f2fs_put_page(page, 0);
304 void f2fs_set_link(struct inode *dir, struct f2fs_dir_entry *de,
305 struct page *page, struct inode *inode)
307 enum page_type type = f2fs_has_inline_dentry(dir) ? NODE : DATA;
309 f2fs_wait_on_page_writeback(page, type, true);
310 de->ino = cpu_to_le32(inode->i_ino);
311 set_de_type(de, inode->i_mode);
312 f2fs_dentry_kunmap(dir, page);
313 set_page_dirty(page);
315 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
316 mark_inode_dirty_sync(dir);
317 f2fs_put_page(page, 1);
320 static void init_dent_inode(const struct qstr *name, struct page *ipage)
322 struct f2fs_inode *ri;
324 f2fs_wait_on_page_writeback(ipage, NODE, true);
326 /* copy name info. to this inode page */
327 ri = F2FS_INODE(ipage);
328 ri->i_namelen = cpu_to_le32(name->len);
329 memcpy(ri->i_name, name->name, name->len);
330 set_page_dirty(ipage);
333 int update_dent_inode(struct inode *inode, struct inode *to,
334 const struct qstr *name)
338 if (file_enc_name(to))
341 page = get_node_page(F2FS_I_SB(inode), inode->i_ino);
343 return PTR_ERR(page);
345 init_dent_inode(name, page);
346 f2fs_put_page(page, 1);
351 void do_make_empty_dir(struct inode *inode, struct inode *parent,
352 struct f2fs_dentry_ptr *d)
354 struct qstr dot = QSTR_INIT(".", 1);
355 struct qstr dotdot = QSTR_INIT("..", 2);
357 /* update dirent of "." */
358 f2fs_update_dentry(inode->i_ino, inode->i_mode, d, &dot, 0, 0);
360 /* update dirent of ".." */
361 f2fs_update_dentry(parent->i_ino, parent->i_mode, d, &dotdot, 0, 1);
364 static int make_empty_dir(struct inode *inode,
365 struct inode *parent, struct page *page)
367 struct page *dentry_page;
368 struct f2fs_dentry_block *dentry_blk;
369 struct f2fs_dentry_ptr d;
371 if (f2fs_has_inline_dentry(inode))
372 return make_empty_inline_dir(inode, parent, page);
374 dentry_page = get_new_data_page(inode, page, 0, true);
375 if (IS_ERR(dentry_page))
376 return PTR_ERR(dentry_page);
378 dentry_blk = kmap_atomic(dentry_page);
380 make_dentry_ptr(NULL, &d, (void *)dentry_blk, 1);
381 do_make_empty_dir(inode, parent, &d);
383 kunmap_atomic(dentry_blk);
385 set_page_dirty(dentry_page);
386 f2fs_put_page(dentry_page, 1);
390 struct page *init_inode_metadata(struct inode *inode, struct inode *dir,
391 const struct qstr *name, struct page *dpage)
396 if (is_inode_flag_set(inode, FI_NEW_INODE)) {
397 page = new_inode_page(inode);
401 if (S_ISDIR(inode->i_mode)) {
402 /* in order to handle error case */
404 err = make_empty_dir(inode, dir, page);
412 err = f2fs_init_acl(inode, dir, page, dpage);
416 err = f2fs_init_security(inode, dir, name, page);
420 if (f2fs_encrypted_inode(dir) && f2fs_may_encrypt(inode)) {
421 err = fscrypt_inherit_context(dir, inode, page, false);
426 page = get_node_page(F2FS_I_SB(dir), inode->i_ino);
430 set_cold_node(inode, page);
434 init_dent_inode(name, page);
437 * This file should be checkpointed during fsync.
438 * We lost i_pino from now on.
440 if (is_inode_flag_set(inode, FI_INC_LINK)) {
441 file_lost_pino(inode);
443 * If link the tmpfile to alias through linkat path,
444 * we should remove this inode from orphan list.
446 if (inode->i_nlink == 0)
447 remove_orphan_inode(F2FS_I_SB(dir), inode->i_ino);
448 f2fs_i_links_write(inode, true);
453 /* truncate empty dir pages */
454 truncate_inode_pages(&inode->i_data, 0);
457 update_inode(inode, page);
458 f2fs_put_page(page, 1);
462 void update_parent_metadata(struct inode *dir, struct inode *inode,
463 unsigned int current_depth)
465 if (inode && is_inode_flag_set(inode, FI_NEW_INODE)) {
466 if (S_ISDIR(inode->i_mode))
467 f2fs_i_links_write(dir, true);
468 clear_inode_flag(inode, FI_NEW_INODE);
470 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
471 mark_inode_dirty_sync(dir);
473 if (F2FS_I(dir)->i_current_depth != current_depth)
474 f2fs_i_depth_write(dir, current_depth);
476 if (inode && is_inode_flag_set(inode, FI_INC_LINK))
477 clear_inode_flag(inode, FI_INC_LINK);
480 int room_for_filename(const void *bitmap, int slots, int max_slots)
483 int zero_start, zero_end;
485 zero_start = find_next_zero_bit_le(bitmap, max_slots, bit_start);
486 if (zero_start >= max_slots)
489 zero_end = find_next_bit_le(bitmap, max_slots, zero_start);
490 if (zero_end - zero_start >= slots)
493 bit_start = zero_end + 1;
495 if (zero_end + 1 >= max_slots)
500 void f2fs_update_dentry(nid_t ino, umode_t mode, struct f2fs_dentry_ptr *d,
501 const struct qstr *name, f2fs_hash_t name_hash,
502 unsigned int bit_pos)
504 struct f2fs_dir_entry *de;
505 int slots = GET_DENTRY_SLOTS(name->len);
508 de = &d->dentry[bit_pos];
509 de->hash_code = name_hash;
510 de->name_len = cpu_to_le16(name->len);
511 memcpy(d->filename[bit_pos], name->name, name->len);
512 de->ino = cpu_to_le32(ino);
513 set_de_type(de, mode);
514 for (i = 0; i < slots; i++) {
515 test_and_set_bit_le(bit_pos + i, (void *)d->bitmap);
516 /* avoid wrong garbage data for readdir */
518 (de + i)->name_len = 0;
522 int f2fs_add_regular_entry(struct inode *dir, const struct qstr *new_name,
523 struct inode *inode, nid_t ino, umode_t mode)
525 unsigned int bit_pos;
527 unsigned int current_depth;
528 unsigned long bidx, block;
529 f2fs_hash_t dentry_hash;
530 unsigned int nbucket, nblock;
531 struct page *dentry_page = NULL;
532 struct f2fs_dentry_block *dentry_blk = NULL;
533 struct f2fs_dentry_ptr d;
534 struct page *page = NULL;
538 slots = GET_DENTRY_SLOTS(new_name->len);
539 dentry_hash = f2fs_dentry_hash(new_name);
541 current_depth = F2FS_I(dir)->i_current_depth;
542 if (F2FS_I(dir)->chash == dentry_hash) {
543 level = F2FS_I(dir)->clevel;
544 F2FS_I(dir)->chash = 0;
548 #ifdef CONFIG_F2FS_FAULT_INJECTION
549 if (time_to_inject(FAULT_DIR_DEPTH))
552 if (unlikely(current_depth == MAX_DIR_HASH_DEPTH))
555 /* Increase the depth, if required */
556 if (level == current_depth)
559 nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level);
560 nblock = bucket_blocks(level);
562 bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level,
563 (le32_to_cpu(dentry_hash) % nbucket));
565 for (block = bidx; block <= (bidx + nblock - 1); block++) {
566 dentry_page = get_new_data_page(dir, NULL, block, true);
567 if (IS_ERR(dentry_page))
568 return PTR_ERR(dentry_page);
570 dentry_blk = kmap(dentry_page);
571 bit_pos = room_for_filename(&dentry_blk->dentry_bitmap,
572 slots, NR_DENTRY_IN_BLOCK);
573 if (bit_pos < NR_DENTRY_IN_BLOCK)
577 f2fs_put_page(dentry_page, 1);
580 /* Move to next level to find the empty slot for new dentry */
584 f2fs_wait_on_page_writeback(dentry_page, DATA, true);
587 down_write(&F2FS_I(inode)->i_sem);
588 page = init_inode_metadata(inode, dir, new_name, NULL);
593 if (f2fs_encrypted_inode(dir))
594 file_set_enc_name(inode);
597 make_dentry_ptr(NULL, &d, (void *)dentry_blk, 1);
598 f2fs_update_dentry(ino, mode, &d, new_name, dentry_hash, bit_pos);
600 set_page_dirty(dentry_page);
603 f2fs_i_pino_write(inode, dir->i_ino);
604 f2fs_put_page(page, 1);
607 update_parent_metadata(dir, inode, current_depth);
610 up_write(&F2FS_I(inode)->i_sem);
613 f2fs_put_page(dentry_page, 1);
619 * Caller should grab and release a rwsem by calling f2fs_lock_op() and
622 int __f2fs_add_link(struct inode *dir, const struct qstr *name,
623 struct inode *inode, nid_t ino, umode_t mode)
625 struct fscrypt_name fname;
626 struct qstr new_name;
629 err = fscrypt_setup_filename(dir, name, 0, &fname);
633 new_name.name = fname_name(&fname);
634 new_name.len = fname_len(&fname);
637 if (f2fs_has_inline_dentry(dir))
638 err = f2fs_add_inline_entry(dir, &new_name, inode, ino, mode);
640 err = f2fs_add_regular_entry(dir, &new_name, inode, ino, mode);
642 fscrypt_free_filename(&fname);
643 f2fs_update_time(F2FS_I_SB(dir), REQ_TIME);
647 int f2fs_do_tmpfile(struct inode *inode, struct inode *dir)
652 down_write(&F2FS_I(inode)->i_sem);
653 page = init_inode_metadata(inode, dir, NULL, NULL);
658 f2fs_put_page(page, 1);
660 clear_inode_flag(inode, FI_NEW_INODE);
662 up_write(&F2FS_I(inode)->i_sem);
663 f2fs_update_time(F2FS_I_SB(inode), REQ_TIME);
667 void f2fs_drop_nlink(struct inode *dir, struct inode *inode)
669 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
671 down_write(&F2FS_I(inode)->i_sem);
673 if (S_ISDIR(inode->i_mode))
674 f2fs_i_links_write(dir, false);
675 inode->i_ctime = CURRENT_TIME;
677 f2fs_i_links_write(inode, false);
678 if (S_ISDIR(inode->i_mode)) {
679 f2fs_i_links_write(inode, false);
680 f2fs_i_size_write(inode, 0);
682 up_write(&F2FS_I(inode)->i_sem);
684 if (inode->i_nlink == 0)
685 add_orphan_inode(sbi, inode->i_ino);
687 release_orphan_inode(sbi);
691 * It only removes the dentry from the dentry page, corresponding name
692 * entry in name page does not need to be touched during deletion.
694 void f2fs_delete_entry(struct f2fs_dir_entry *dentry, struct page *page,
695 struct inode *dir, struct inode *inode)
697 struct f2fs_dentry_block *dentry_blk;
698 unsigned int bit_pos;
699 int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len));
702 f2fs_update_time(F2FS_I_SB(dir), REQ_TIME);
704 if (f2fs_has_inline_dentry(dir))
705 return f2fs_delete_inline_entry(dentry, page, dir, inode);
708 f2fs_wait_on_page_writeback(page, DATA, true);
710 dentry_blk = page_address(page);
711 bit_pos = dentry - dentry_blk->dentry;
712 for (i = 0; i < slots; i++)
713 clear_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap);
715 /* Let's check and deallocate this dentry page */
716 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
719 kunmap(page); /* kunmap - pair of f2fs_find_entry */
720 set_page_dirty(page);
722 dir->i_ctime = dir->i_mtime = CURRENT_TIME;
723 mark_inode_dirty_sync(dir);
726 f2fs_drop_nlink(dir, inode);
728 if (bit_pos == NR_DENTRY_IN_BLOCK &&
729 !truncate_hole(dir, page->index, page->index + 1)) {
730 clear_page_dirty_for_io(page);
731 ClearPagePrivate(page);
732 ClearPageUptodate(page);
733 inode_dec_dirty_pages(dir);
735 f2fs_put_page(page, 1);
738 bool f2fs_empty_dir(struct inode *dir)
741 struct page *dentry_page;
742 unsigned int bit_pos;
743 struct f2fs_dentry_block *dentry_blk;
744 unsigned long nblock = dir_blocks(dir);
746 if (f2fs_has_inline_dentry(dir))
747 return f2fs_empty_inline_dir(dir);
749 for (bidx = 0; bidx < nblock; bidx++) {
750 dentry_page = get_lock_data_page(dir, bidx, false);
751 if (IS_ERR(dentry_page)) {
752 if (PTR_ERR(dentry_page) == -ENOENT)
758 dentry_blk = kmap_atomic(dentry_page);
763 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
766 kunmap_atomic(dentry_blk);
768 f2fs_put_page(dentry_page, 1);
770 if (bit_pos < NR_DENTRY_IN_BLOCK)
776 bool f2fs_fill_dentries(struct dir_context *ctx, struct f2fs_dentry_ptr *d,
777 unsigned int start_pos, struct fscrypt_str *fstr)
779 unsigned char d_type = DT_UNKNOWN;
780 unsigned int bit_pos;
781 struct f2fs_dir_entry *de = NULL;
782 struct fscrypt_str de_name = FSTR_INIT(NULL, 0);
784 bit_pos = ((unsigned long)ctx->pos % d->max);
786 while (bit_pos < d->max) {
787 bit_pos = find_next_bit_le(d->bitmap, d->max, bit_pos);
788 if (bit_pos >= d->max)
791 de = &d->dentry[bit_pos];
792 if (de->name_len == 0) {
794 ctx->pos = start_pos + bit_pos;
798 d_type = get_de_type(de);
800 de_name.name = d->filename[bit_pos];
801 de_name.len = le16_to_cpu(de->name_len);
803 if (f2fs_encrypted_inode(d->inode)) {
804 int save_len = fstr->len;
807 de_name.name = f2fs_kmalloc(de_name.len, GFP_NOFS);
811 memcpy(de_name.name, d->filename[bit_pos], de_name.len);
813 ret = fscrypt_fname_disk_to_usr(d->inode,
814 (u32)de->hash_code, 0,
821 fstr->len = save_len;
824 if (!dir_emit(ctx, de_name.name, de_name.len,
825 le32_to_cpu(de->ino), d_type))
828 bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
829 ctx->pos = start_pos + bit_pos;
834 static int f2fs_readdir(struct file *file, struct dir_context *ctx)
836 struct inode *inode = file_inode(file);
837 unsigned long npages = dir_blocks(inode);
838 struct f2fs_dentry_block *dentry_blk = NULL;
839 struct page *dentry_page = NULL;
840 struct file_ra_state *ra = &file->f_ra;
841 unsigned int n = ((unsigned long)ctx->pos / NR_DENTRY_IN_BLOCK);
842 struct f2fs_dentry_ptr d;
843 struct fscrypt_str fstr = FSTR_INIT(NULL, 0);
846 if (f2fs_encrypted_inode(inode)) {
847 err = fscrypt_get_encryption_info(inode);
848 if (err && err != -ENOKEY)
851 err = fscrypt_fname_alloc_buffer(inode, F2FS_NAME_LEN, &fstr);
856 if (f2fs_has_inline_dentry(inode)) {
857 err = f2fs_read_inline_dir(file, ctx, &fstr);
861 /* readahead for multi pages of dir */
862 if (npages - n > 1 && !ra_has_index(ra, n))
863 page_cache_sync_readahead(inode->i_mapping, ra, file, n,
864 min(npages - n, (pgoff_t)MAX_DIR_RA_PAGES));
866 for (; n < npages; n++) {
867 dentry_page = get_lock_data_page(inode, n, false);
868 if (IS_ERR(dentry_page)) {
869 err = PTR_ERR(dentry_page);
876 dentry_blk = kmap(dentry_page);
878 make_dentry_ptr(inode, &d, (void *)dentry_blk, 1);
880 if (f2fs_fill_dentries(ctx, &d, n * NR_DENTRY_IN_BLOCK, &fstr)) {
882 f2fs_put_page(dentry_page, 1);
886 ctx->pos = (n + 1) * NR_DENTRY_IN_BLOCK;
888 f2fs_put_page(dentry_page, 1);
892 fscrypt_fname_free_buffer(&fstr);
896 static int f2fs_dir_open(struct inode *inode, struct file *filp)
898 if (f2fs_encrypted_inode(inode))
899 return fscrypt_get_encryption_info(inode) ? -EACCES : 0;
903 const struct file_operations f2fs_dir_operations = {
904 .llseek = generic_file_llseek,
905 .read = generic_read_dir,
906 .iterate_shared = f2fs_readdir,
907 .fsync = f2fs_sync_file,
908 .open = f2fs_dir_open,
909 .unlocked_ioctl = f2fs_ioctl,
911 .compat_ioctl = f2fs_compat_ioctl,