1 // SPDX-License-Identifier: GPL-2.0
5 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
6 * http://www.samsung.com/
9 #include <linux/f2fs_fs.h>
10 #include <linux/sched/signal.h>
11 #include <linux/unicode.h>
16 #include <trace/events/f2fs.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 static 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 f2fs_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 inode *dir,
86 struct page *dentry_page,
87 struct fscrypt_name *fname,
90 struct page **res_page)
92 struct f2fs_dentry_block *dentry_blk;
93 struct f2fs_dir_entry *de;
94 struct f2fs_dentry_ptr d;
96 dentry_blk = (struct f2fs_dentry_block *)page_address(dentry_page);
98 make_dentry_ptr_block(dir, &d, dentry_blk);
99 de = f2fs_find_target_dentry(fname, namehash, max_slots, &d);
101 *res_page = dentry_page;
106 #ifdef CONFIG_UNICODE
108 * Test whether a case-insensitive directory entry matches the filename
109 * being searched for.
111 * Returns: 0 if the directory entry matches, more than 0 if it
112 * doesn't match or less than zero on error.
114 int f2fs_ci_compare(const struct inode *parent, const struct qstr *name,
115 const struct qstr *entry, bool quick)
117 const struct f2fs_sb_info *sbi = F2FS_SB(parent->i_sb);
118 const struct unicode_map *um = sbi->s_encoding;
122 ret = utf8_strncasecmp_folded(um, name, entry);
124 ret = utf8_strncasecmp(um, name, entry);
127 /* Handle invalid character sequence as either an error
128 * or as an opaque byte sequence.
130 if (f2fs_has_strict_mode(sbi))
133 if (name->len != entry->len)
136 return !!memcmp(name->name, entry->name, name->len);
142 static void f2fs_fname_setup_ci_filename(struct inode *dir,
143 const struct qstr *iname,
144 struct fscrypt_str *cf_name)
146 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
148 if (!IS_CASEFOLDED(dir)) {
149 cf_name->name = NULL;
153 cf_name->name = f2fs_kmalloc(sbi, F2FS_NAME_LEN, GFP_NOFS);
157 cf_name->len = utf8_casefold(sbi->s_encoding,
158 iname, cf_name->name,
160 if ((int)cf_name->len <= 0) {
161 kvfree(cf_name->name);
162 cf_name->name = NULL;
167 static inline bool f2fs_match_name(struct f2fs_dentry_ptr *d,
168 struct f2fs_dir_entry *de,
169 struct fscrypt_name *fname,
170 struct fscrypt_str *cf_str,
171 unsigned long bit_pos,
172 f2fs_hash_t namehash)
174 #ifdef CONFIG_UNICODE
175 struct inode *parent = d->inode;
176 struct f2fs_sb_info *sbi = F2FS_I_SB(parent);
180 if (de->hash_code != namehash)
183 #ifdef CONFIG_UNICODE
184 entry.name = d->filename[bit_pos];
185 entry.len = de->name_len;
187 if (sbi->s_encoding && IS_CASEFOLDED(parent)) {
189 struct qstr cf = {.name = cf_str->name,
191 return !f2fs_ci_compare(parent, &cf, &entry, true);
193 return !f2fs_ci_compare(parent, fname->usr_fname, &entry,
197 if (fscrypt_match_name(fname, d->filename[bit_pos],
198 le16_to_cpu(de->name_len)))
203 struct f2fs_dir_entry *f2fs_find_target_dentry(struct fscrypt_name *fname,
204 f2fs_hash_t namehash, int *max_slots,
205 struct f2fs_dentry_ptr *d)
207 struct f2fs_dir_entry *de;
208 struct fscrypt_str cf_str = { .name = NULL, .len = 0 };
209 unsigned long bit_pos = 0;
212 #ifdef CONFIG_UNICODE
213 f2fs_fname_setup_ci_filename(d->inode, fname->usr_fname, &cf_str);
218 while (bit_pos < d->max) {
219 if (!test_bit_le(bit_pos, d->bitmap)) {
225 de = &d->dentry[bit_pos];
227 if (unlikely(!de->name_len)) {
232 if (f2fs_match_name(d, de, fname, &cf_str, bit_pos, namehash))
235 if (max_slots && max_len > *max_slots)
236 *max_slots = max_len;
239 bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
244 if (max_slots && max_len > *max_slots)
245 *max_slots = max_len;
247 #ifdef CONFIG_UNICODE
253 static struct f2fs_dir_entry *find_in_level(struct inode *dir,
255 struct fscrypt_name *fname,
256 struct page **res_page)
258 struct qstr name = FSTR_TO_QSTR(&fname->disk_name);
259 int s = GET_DENTRY_SLOTS(name.len);
260 unsigned int nbucket, nblock;
261 unsigned int bidx, end_block;
262 struct page *dentry_page;
263 struct f2fs_dir_entry *de = NULL;
266 f2fs_hash_t namehash = f2fs_dentry_hash(dir, &name, fname);
268 nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level);
269 nblock = bucket_blocks(level);
271 bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level,
272 le32_to_cpu(namehash) % nbucket);
273 end_block = bidx + nblock;
275 for (; bidx < end_block; bidx++) {
276 /* no need to allocate new dentry pages to all the indices */
277 dentry_page = f2fs_find_data_page(dir, bidx);
278 if (IS_ERR(dentry_page)) {
279 if (PTR_ERR(dentry_page) == -ENOENT) {
283 *res_page = dentry_page;
288 de = find_in_block(dir, dentry_page, fname, namehash,
289 &max_slots, res_page);
295 f2fs_put_page(dentry_page, 0);
298 if (!de && room && F2FS_I(dir)->chash != namehash) {
299 F2FS_I(dir)->chash = namehash;
300 F2FS_I(dir)->clevel = level;
306 struct f2fs_dir_entry *__f2fs_find_entry(struct inode *dir,
307 struct fscrypt_name *fname, struct page **res_page)
309 unsigned long npages = dir_blocks(dir);
310 struct f2fs_dir_entry *de = NULL;
311 unsigned int max_depth;
314 if (f2fs_has_inline_dentry(dir)) {
316 de = f2fs_find_in_inline_dir(dir, fname, res_page);
325 max_depth = F2FS_I(dir)->i_current_depth;
326 if (unlikely(max_depth > MAX_DIR_HASH_DEPTH)) {
327 f2fs_warn(F2FS_I_SB(dir), "Corrupted max_depth of %lu: %u",
328 dir->i_ino, max_depth);
329 max_depth = MAX_DIR_HASH_DEPTH;
330 f2fs_i_depth_write(dir, max_depth);
333 for (level = 0; level < max_depth; level++) {
335 de = find_in_level(dir, level, fname, res_page);
336 if (de || IS_ERR(*res_page))
340 /* This is to increase the speed of f2fs_create */
342 F2FS_I(dir)->task = current;
347 * Find an entry in the specified directory with the wanted name.
348 * It returns the page where the entry was found (as a parameter - res_page),
349 * and the entry itself. Page is returned mapped and unlocked.
350 * Entry is guaranteed to be valid.
352 struct f2fs_dir_entry *f2fs_find_entry(struct inode *dir,
353 const struct qstr *child, struct page **res_page)
355 struct f2fs_dir_entry *de = NULL;
356 struct fscrypt_name fname;
359 #ifdef CONFIG_UNICODE
360 if (f2fs_has_strict_mode(F2FS_I_SB(dir)) && IS_CASEFOLDED(dir) &&
361 utf8_validate(F2FS_I_SB(dir)->s_encoding, child)) {
362 *res_page = ERR_PTR(-EINVAL);
367 err = fscrypt_setup_filename(dir, child, 1, &fname);
372 *res_page = ERR_PTR(err);
376 de = __f2fs_find_entry(dir, &fname, res_page);
378 fscrypt_free_filename(&fname);
382 struct f2fs_dir_entry *f2fs_parent_dir(struct inode *dir, struct page **p)
384 struct qstr dotdot = QSTR_INIT("..", 2);
386 return f2fs_find_entry(dir, &dotdot, p);
389 ino_t f2fs_inode_by_name(struct inode *dir, const struct qstr *qstr,
393 struct f2fs_dir_entry *de;
395 de = f2fs_find_entry(dir, qstr, page);
397 res = le32_to_cpu(de->ino);
398 f2fs_put_page(*page, 0);
404 void f2fs_set_link(struct inode *dir, struct f2fs_dir_entry *de,
405 struct page *page, struct inode *inode)
407 enum page_type type = f2fs_has_inline_dentry(dir) ? NODE : DATA;
409 f2fs_wait_on_page_writeback(page, type, true, true);
410 de->ino = cpu_to_le32(inode->i_ino);
411 set_de_type(de, inode->i_mode);
412 set_page_dirty(page);
414 dir->i_mtime = dir->i_ctime = current_time(dir);
415 f2fs_mark_inode_dirty_sync(dir, false);
416 f2fs_put_page(page, 1);
419 static void init_dent_inode(const struct qstr *name, struct page *ipage)
421 struct f2fs_inode *ri;
423 f2fs_wait_on_page_writeback(ipage, NODE, true, true);
425 /* copy name info. to this inode page */
426 ri = F2FS_INODE(ipage);
427 ri->i_namelen = cpu_to_le32(name->len);
428 memcpy(ri->i_name, name->name, name->len);
429 set_page_dirty(ipage);
432 void f2fs_do_make_empty_dir(struct inode *inode, struct inode *parent,
433 struct f2fs_dentry_ptr *d)
435 struct qstr dot = QSTR_INIT(".", 1);
436 struct qstr dotdot = QSTR_INIT("..", 2);
438 /* update dirent of "." */
439 f2fs_update_dentry(inode->i_ino, inode->i_mode, d, &dot, 0, 0);
441 /* update dirent of ".." */
442 f2fs_update_dentry(parent->i_ino, parent->i_mode, d, &dotdot, 0, 1);
445 static int make_empty_dir(struct inode *inode,
446 struct inode *parent, struct page *page)
448 struct page *dentry_page;
449 struct f2fs_dentry_block *dentry_blk;
450 struct f2fs_dentry_ptr d;
452 if (f2fs_has_inline_dentry(inode))
453 return f2fs_make_empty_inline_dir(inode, parent, page);
455 dentry_page = f2fs_get_new_data_page(inode, page, 0, true);
456 if (IS_ERR(dentry_page))
457 return PTR_ERR(dentry_page);
459 dentry_blk = page_address(dentry_page);
461 make_dentry_ptr_block(NULL, &d, dentry_blk);
462 f2fs_do_make_empty_dir(inode, parent, &d);
464 set_page_dirty(dentry_page);
465 f2fs_put_page(dentry_page, 1);
469 struct page *f2fs_init_inode_metadata(struct inode *inode, struct inode *dir,
470 const struct qstr *new_name, const struct qstr *orig_name,
476 if (is_inode_flag_set(inode, FI_NEW_INODE)) {
477 page = f2fs_new_inode_page(inode);
481 if (S_ISDIR(inode->i_mode)) {
482 /* in order to handle error case */
484 err = make_empty_dir(inode, dir, page);
492 err = f2fs_init_acl(inode, dir, page, dpage);
496 err = f2fs_init_security(inode, dir, orig_name, page);
500 if (IS_ENCRYPTED(inode)) {
501 err = fscrypt_inherit_context(dir, inode, page, false);
506 page = f2fs_get_node_page(F2FS_I_SB(dir), inode->i_ino);
512 init_dent_inode(new_name, page);
513 if (IS_ENCRYPTED(dir))
514 file_set_enc_name(inode);
518 * This file should be checkpointed during fsync.
519 * We lost i_pino from now on.
521 if (is_inode_flag_set(inode, FI_INC_LINK)) {
522 if (!S_ISDIR(inode->i_mode))
523 file_lost_pino(inode);
525 * If link the tmpfile to alias through linkat path,
526 * we should remove this inode from orphan list.
528 if (inode->i_nlink == 0)
529 f2fs_remove_orphan_inode(F2FS_I_SB(dir), inode->i_ino);
530 f2fs_i_links_write(inode, true);
536 f2fs_update_inode(inode, page);
537 f2fs_put_page(page, 1);
541 void f2fs_update_parent_metadata(struct inode *dir, struct inode *inode,
542 unsigned int current_depth)
544 if (inode && is_inode_flag_set(inode, FI_NEW_INODE)) {
545 if (S_ISDIR(inode->i_mode))
546 f2fs_i_links_write(dir, true);
547 clear_inode_flag(inode, FI_NEW_INODE);
549 dir->i_mtime = dir->i_ctime = current_time(dir);
550 f2fs_mark_inode_dirty_sync(dir, false);
552 if (F2FS_I(dir)->i_current_depth != current_depth)
553 f2fs_i_depth_write(dir, current_depth);
555 if (inode && is_inode_flag_set(inode, FI_INC_LINK))
556 clear_inode_flag(inode, FI_INC_LINK);
559 int f2fs_room_for_filename(const void *bitmap, int slots, int max_slots)
562 int zero_start, zero_end;
564 zero_start = find_next_zero_bit_le(bitmap, max_slots, bit_start);
565 if (zero_start >= max_slots)
568 zero_end = find_next_bit_le(bitmap, max_slots, zero_start);
569 if (zero_end - zero_start >= slots)
572 bit_start = zero_end + 1;
574 if (zero_end + 1 >= max_slots)
579 bool f2fs_has_enough_room(struct inode *dir, struct page *ipage,
580 struct fscrypt_name *fname)
582 struct f2fs_dentry_ptr d;
583 unsigned int bit_pos;
584 int slots = GET_DENTRY_SLOTS(fname_len(fname));
586 make_dentry_ptr_inline(dir, &d, inline_data_addr(dir, ipage));
588 bit_pos = f2fs_room_for_filename(d.bitmap, slots, d.max);
590 return bit_pos < d.max;
593 void f2fs_update_dentry(nid_t ino, umode_t mode, struct f2fs_dentry_ptr *d,
594 const struct qstr *name, f2fs_hash_t name_hash,
595 unsigned int bit_pos)
597 struct f2fs_dir_entry *de;
598 int slots = GET_DENTRY_SLOTS(name->len);
601 de = &d->dentry[bit_pos];
602 de->hash_code = name_hash;
603 de->name_len = cpu_to_le16(name->len);
604 memcpy(d->filename[bit_pos], name->name, name->len);
605 de->ino = cpu_to_le32(ino);
606 set_de_type(de, mode);
607 for (i = 0; i < slots; i++) {
608 __set_bit_le(bit_pos + i, (void *)d->bitmap);
609 /* avoid wrong garbage data for readdir */
611 (de + i)->name_len = 0;
615 int f2fs_add_regular_entry(struct inode *dir, const struct qstr *new_name,
616 const struct qstr *orig_name,
617 struct inode *inode, nid_t ino, umode_t mode)
619 unsigned int bit_pos;
621 unsigned int current_depth;
622 unsigned long bidx, block;
623 f2fs_hash_t dentry_hash;
624 unsigned int nbucket, nblock;
625 struct page *dentry_page = NULL;
626 struct f2fs_dentry_block *dentry_blk = NULL;
627 struct f2fs_dentry_ptr d;
628 struct page *page = NULL;
632 slots = GET_DENTRY_SLOTS(new_name->len);
633 dentry_hash = f2fs_dentry_hash(dir, new_name, NULL);
635 current_depth = F2FS_I(dir)->i_current_depth;
636 if (F2FS_I(dir)->chash == dentry_hash) {
637 level = F2FS_I(dir)->clevel;
638 F2FS_I(dir)->chash = 0;
642 if (time_to_inject(F2FS_I_SB(dir), FAULT_DIR_DEPTH)) {
643 f2fs_show_injection_info(F2FS_I_SB(dir), FAULT_DIR_DEPTH);
647 if (unlikely(current_depth == MAX_DIR_HASH_DEPTH))
650 /* Increase the depth, if required */
651 if (level == current_depth)
654 nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level);
655 nblock = bucket_blocks(level);
657 bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level,
658 (le32_to_cpu(dentry_hash) % nbucket));
660 for (block = bidx; block <= (bidx + nblock - 1); block++) {
661 dentry_page = f2fs_get_new_data_page(dir, NULL, block, true);
662 if (IS_ERR(dentry_page))
663 return PTR_ERR(dentry_page);
665 dentry_blk = page_address(dentry_page);
666 bit_pos = f2fs_room_for_filename(&dentry_blk->dentry_bitmap,
667 slots, NR_DENTRY_IN_BLOCK);
668 if (bit_pos < NR_DENTRY_IN_BLOCK)
671 f2fs_put_page(dentry_page, 1);
674 /* Move to next level to find the empty slot for new dentry */
678 f2fs_wait_on_page_writeback(dentry_page, DATA, true, true);
681 down_write(&F2FS_I(inode)->i_sem);
682 page = f2fs_init_inode_metadata(inode, dir, new_name,
690 make_dentry_ptr_block(NULL, &d, dentry_blk);
691 f2fs_update_dentry(ino, mode, &d, new_name, dentry_hash, bit_pos);
693 set_page_dirty(dentry_page);
696 f2fs_i_pino_write(inode, dir->i_ino);
698 /* synchronize inode page's data from inode cache */
699 if (is_inode_flag_set(inode, FI_NEW_INODE))
700 f2fs_update_inode(inode, page);
702 f2fs_put_page(page, 1);
705 f2fs_update_parent_metadata(dir, inode, current_depth);
708 up_write(&F2FS_I(inode)->i_sem);
710 f2fs_put_page(dentry_page, 1);
715 int f2fs_add_dentry(struct inode *dir, struct fscrypt_name *fname,
716 struct inode *inode, nid_t ino, umode_t mode)
718 struct qstr new_name;
721 new_name.name = fname_name(fname);
722 new_name.len = fname_len(fname);
724 if (f2fs_has_inline_dentry(dir))
725 err = f2fs_add_inline_entry(dir, &new_name, fname->usr_fname,
728 err = f2fs_add_regular_entry(dir, &new_name, fname->usr_fname,
731 f2fs_update_time(F2FS_I_SB(dir), REQ_TIME);
736 * Caller should grab and release a rwsem by calling f2fs_lock_op() and
739 int f2fs_do_add_link(struct inode *dir, const struct qstr *name,
740 struct inode *inode, nid_t ino, umode_t mode)
742 struct fscrypt_name fname;
743 struct page *page = NULL;
744 struct f2fs_dir_entry *de = NULL;
747 err = fscrypt_setup_filename(dir, name, 0, &fname);
752 * An immature stakable filesystem shows a race condition between lookup
753 * and create. If we have same task when doing lookup and create, it's
754 * definitely fine as expected by VFS normally. Otherwise, let's just
755 * verify on-disk dentry one more time, which guarantees filesystem
758 if (current != F2FS_I(dir)->task) {
759 de = __f2fs_find_entry(dir, &fname, &page);
760 F2FS_I(dir)->task = NULL;
763 f2fs_put_page(page, 0);
765 } else if (IS_ERR(page)) {
768 err = f2fs_add_dentry(dir, &fname, inode, ino, mode);
770 fscrypt_free_filename(&fname);
774 int f2fs_do_tmpfile(struct inode *inode, struct inode *dir)
779 down_write(&F2FS_I(inode)->i_sem);
780 page = f2fs_init_inode_metadata(inode, dir, NULL, NULL, NULL);
785 f2fs_put_page(page, 1);
787 clear_inode_flag(inode, FI_NEW_INODE);
788 f2fs_update_time(F2FS_I_SB(inode), REQ_TIME);
790 up_write(&F2FS_I(inode)->i_sem);
794 void f2fs_drop_nlink(struct inode *dir, struct inode *inode)
796 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
798 down_write(&F2FS_I(inode)->i_sem);
800 if (S_ISDIR(inode->i_mode))
801 f2fs_i_links_write(dir, false);
802 inode->i_ctime = current_time(inode);
804 f2fs_i_links_write(inode, false);
805 if (S_ISDIR(inode->i_mode)) {
806 f2fs_i_links_write(inode, false);
807 f2fs_i_size_write(inode, 0);
809 up_write(&F2FS_I(inode)->i_sem);
811 if (inode->i_nlink == 0)
812 f2fs_add_orphan_inode(inode);
814 f2fs_release_orphan_inode(sbi);
818 * It only removes the dentry from the dentry page, corresponding name
819 * entry in name page does not need to be touched during deletion.
821 void f2fs_delete_entry(struct f2fs_dir_entry *dentry, struct page *page,
822 struct inode *dir, struct inode *inode)
824 struct f2fs_dentry_block *dentry_blk;
825 unsigned int bit_pos;
826 int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len));
829 f2fs_update_time(F2FS_I_SB(dir), REQ_TIME);
831 if (F2FS_OPTION(F2FS_I_SB(dir)).fsync_mode == FSYNC_MODE_STRICT)
832 f2fs_add_ino_entry(F2FS_I_SB(dir), dir->i_ino, TRANS_DIR_INO);
834 if (f2fs_has_inline_dentry(dir))
835 return f2fs_delete_inline_entry(dentry, page, dir, inode);
838 f2fs_wait_on_page_writeback(page, DATA, true, true);
840 dentry_blk = page_address(page);
841 bit_pos = dentry - dentry_blk->dentry;
842 for (i = 0; i < slots; i++)
843 __clear_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap);
845 /* Let's check and deallocate this dentry page */
846 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
849 set_page_dirty(page);
851 if (bit_pos == NR_DENTRY_IN_BLOCK &&
852 !f2fs_truncate_hole(dir, page->index, page->index + 1)) {
853 f2fs_clear_page_cache_dirty_tag(page);
854 clear_page_dirty_for_io(page);
855 f2fs_clear_page_private(page);
856 ClearPageUptodate(page);
857 clear_cold_data(page);
858 inode_dec_dirty_pages(dir);
859 f2fs_remove_dirty_inode(dir);
861 f2fs_put_page(page, 1);
863 dir->i_ctime = dir->i_mtime = current_time(dir);
864 f2fs_mark_inode_dirty_sync(dir, false);
867 f2fs_drop_nlink(dir, inode);
870 bool f2fs_empty_dir(struct inode *dir)
873 struct page *dentry_page;
874 unsigned int bit_pos;
875 struct f2fs_dentry_block *dentry_blk;
876 unsigned long nblock = dir_blocks(dir);
878 if (f2fs_has_inline_dentry(dir))
879 return f2fs_empty_inline_dir(dir);
881 for (bidx = 0; bidx < nblock; bidx++) {
882 dentry_page = f2fs_get_lock_data_page(dir, bidx, false);
883 if (IS_ERR(dentry_page)) {
884 if (PTR_ERR(dentry_page) == -ENOENT)
890 dentry_blk = page_address(dentry_page);
895 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
899 f2fs_put_page(dentry_page, 1);
901 if (bit_pos < NR_DENTRY_IN_BLOCK)
907 int f2fs_fill_dentries(struct dir_context *ctx, struct f2fs_dentry_ptr *d,
908 unsigned int start_pos, struct fscrypt_str *fstr)
910 unsigned char d_type = DT_UNKNOWN;
911 unsigned int bit_pos;
912 struct f2fs_dir_entry *de = NULL;
913 struct fscrypt_str de_name = FSTR_INIT(NULL, 0);
914 struct f2fs_sb_info *sbi = F2FS_I_SB(d->inode);
915 struct blk_plug plug;
916 bool readdir_ra = sbi->readdir_ra == 1;
919 bit_pos = ((unsigned long)ctx->pos % d->max);
922 blk_start_plug(&plug);
924 while (bit_pos < d->max) {
925 bit_pos = find_next_bit_le(d->bitmap, d->max, bit_pos);
926 if (bit_pos >= d->max)
929 de = &d->dentry[bit_pos];
930 if (de->name_len == 0) {
932 ctx->pos = start_pos + bit_pos;
934 "%sF2FS-fs (%s): invalid namelen(0), ino:%u, run fsck to fix.",
935 KERN_WARNING, sbi->sb->s_id,
936 le32_to_cpu(de->ino));
937 set_sbi_flag(sbi, SBI_NEED_FSCK);
941 d_type = f2fs_get_de_type(de);
943 de_name.name = d->filename[bit_pos];
944 de_name.len = le16_to_cpu(de->name_len);
946 /* check memory boundary before moving forward */
947 bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
948 if (unlikely(bit_pos > d->max ||
949 le16_to_cpu(de->name_len) > F2FS_NAME_LEN)) {
950 f2fs_warn(sbi, "%s: corrupted namelen=%d, run fsck to fix.",
951 __func__, le16_to_cpu(de->name_len));
952 set_sbi_flag(sbi, SBI_NEED_FSCK);
957 if (IS_ENCRYPTED(d->inode)) {
958 int save_len = fstr->len;
960 err = fscrypt_fname_disk_to_usr(d->inode,
961 (u32)le32_to_cpu(de->hash_code),
967 fstr->len = save_len;
970 if (!dir_emit(ctx, de_name.name, de_name.len,
971 le32_to_cpu(de->ino), d_type)) {
977 f2fs_ra_node_page(sbi, le32_to_cpu(de->ino));
979 ctx->pos = start_pos + bit_pos;
983 blk_finish_plug(&plug);
987 static int f2fs_readdir(struct file *file, struct dir_context *ctx)
989 struct inode *inode = file_inode(file);
990 unsigned long npages = dir_blocks(inode);
991 struct f2fs_dentry_block *dentry_blk = NULL;
992 struct page *dentry_page = NULL;
993 struct file_ra_state *ra = &file->f_ra;
994 loff_t start_pos = ctx->pos;
995 unsigned int n = ((unsigned long)ctx->pos / NR_DENTRY_IN_BLOCK);
996 struct f2fs_dentry_ptr d;
997 struct fscrypt_str fstr = FSTR_INIT(NULL, 0);
1000 if (IS_ENCRYPTED(inode)) {
1001 err = fscrypt_get_encryption_info(inode);
1005 err = fscrypt_fname_alloc_buffer(inode, F2FS_NAME_LEN, &fstr);
1010 if (f2fs_has_inline_dentry(inode)) {
1011 err = f2fs_read_inline_dir(file, ctx, &fstr);
1015 for (; n < npages; n++, ctx->pos = n * NR_DENTRY_IN_BLOCK) {
1017 /* allow readdir() to be interrupted */
1018 if (fatal_signal_pending(current)) {
1024 /* readahead for multi pages of dir */
1025 if (npages - n > 1 && !ra_has_index(ra, n))
1026 page_cache_sync_readahead(inode->i_mapping, ra, file, n,
1027 min(npages - n, (pgoff_t)MAX_DIR_RA_PAGES));
1029 dentry_page = f2fs_find_data_page(inode, n);
1030 if (IS_ERR(dentry_page)) {
1031 err = PTR_ERR(dentry_page);
1032 if (err == -ENOENT) {
1040 dentry_blk = page_address(dentry_page);
1042 make_dentry_ptr_block(inode, &d, dentry_blk);
1044 err = f2fs_fill_dentries(ctx, &d,
1045 n * NR_DENTRY_IN_BLOCK, &fstr);
1047 f2fs_put_page(dentry_page, 0);
1051 f2fs_put_page(dentry_page, 0);
1054 fscrypt_fname_free_buffer(&fstr);
1056 trace_f2fs_readdir(inode, start_pos, ctx->pos, err);
1057 return err < 0 ? err : 0;
1060 static int f2fs_dir_open(struct inode *inode, struct file *filp)
1062 if (IS_ENCRYPTED(inode))
1063 return fscrypt_get_encryption_info(inode) ? -EACCES : 0;
1067 const struct file_operations f2fs_dir_operations = {
1068 .llseek = generic_file_llseek,
1069 .read = generic_read_dir,
1070 .iterate_shared = f2fs_readdir,
1071 .fsync = f2fs_sync_file,
1072 .open = f2fs_dir_open,
1073 .unlocked_ioctl = f2fs_ioctl,
1074 #ifdef CONFIG_COMPAT
1075 .compat_ioctl = f2fs_compat_ioctl,
1079 #ifdef CONFIG_UNICODE
1080 static int f2fs_d_compare(const struct dentry *dentry, unsigned int len,
1081 const char *str, const struct qstr *name)
1083 struct qstr qstr = {.name = str, .len = len };
1084 const struct dentry *parent = READ_ONCE(dentry->d_parent);
1085 const struct inode *inode = READ_ONCE(parent->d_inode);
1087 if (!inode || !IS_CASEFOLDED(inode)) {
1088 if (len != name->len)
1090 return memcmp(str, name->name, len);
1093 return f2fs_ci_compare(inode, name, &qstr, false);
1096 static int f2fs_d_hash(const struct dentry *dentry, struct qstr *str)
1098 struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb);
1099 const struct unicode_map *um = sbi->s_encoding;
1100 const struct inode *inode = READ_ONCE(dentry->d_inode);
1101 unsigned char *norm;
1104 if (!inode || !IS_CASEFOLDED(inode))
1107 norm = f2fs_kmalloc(sbi, PATH_MAX, GFP_ATOMIC);
1111 len = utf8_casefold(um, str, norm, PATH_MAX);
1113 if (f2fs_has_strict_mode(sbi))
1117 str->hash = full_name_hash(dentry, norm, len);
1123 const struct dentry_operations f2fs_dentry_ops = {
1124 .d_hash = f2fs_d_hash,
1125 .d_compare = f2fs_d_compare,