1 // SPDX-License-Identifier: GPL-2.0
5 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
6 * http://www.samsung.com/
8 #include <asm/unaligned.h>
10 #include <linux/f2fs_fs.h>
11 #include <linux/sched/signal.h>
12 #include <linux/unicode.h>
17 #include <trace/events/f2fs.h>
19 static unsigned long dir_blocks(struct inode *inode)
21 return ((unsigned long long) (i_size_read(inode) + PAGE_SIZE - 1))
25 static unsigned int dir_buckets(unsigned int level, int dir_level)
27 if (level + dir_level < MAX_DIR_HASH_DEPTH / 2)
28 return 1 << (level + dir_level);
30 return MAX_DIR_BUCKETS;
33 static unsigned int bucket_blocks(unsigned int level)
35 if (level < MAX_DIR_HASH_DEPTH / 2)
41 static unsigned char f2fs_filetype_table[F2FS_FT_MAX] = {
42 [F2FS_FT_UNKNOWN] = DT_UNKNOWN,
43 [F2FS_FT_REG_FILE] = DT_REG,
44 [F2FS_FT_DIR] = DT_DIR,
45 [F2FS_FT_CHRDEV] = DT_CHR,
46 [F2FS_FT_BLKDEV] = DT_BLK,
47 [F2FS_FT_FIFO] = DT_FIFO,
48 [F2FS_FT_SOCK] = DT_SOCK,
49 [F2FS_FT_SYMLINK] = DT_LNK,
52 static unsigned char f2fs_type_by_mode[S_IFMT >> S_SHIFT] = {
53 [S_IFREG >> S_SHIFT] = F2FS_FT_REG_FILE,
54 [S_IFDIR >> S_SHIFT] = F2FS_FT_DIR,
55 [S_IFCHR >> S_SHIFT] = F2FS_FT_CHRDEV,
56 [S_IFBLK >> S_SHIFT] = F2FS_FT_BLKDEV,
57 [S_IFIFO >> S_SHIFT] = F2FS_FT_FIFO,
58 [S_IFSOCK >> S_SHIFT] = F2FS_FT_SOCK,
59 [S_IFLNK >> S_SHIFT] = F2FS_FT_SYMLINK,
62 static void set_de_type(struct f2fs_dir_entry *de, umode_t mode)
64 de->file_type = f2fs_type_by_mode[(mode & S_IFMT) >> S_SHIFT];
67 unsigned char f2fs_get_de_type(struct f2fs_dir_entry *de)
69 if (de->file_type < F2FS_FT_MAX)
70 return f2fs_filetype_table[de->file_type];
74 /* If @dir is casefolded, initialize @fname->cf_name from @fname->usr_fname. */
75 int f2fs_init_casefolded_name(const struct inode *dir,
76 struct f2fs_filename *fname)
79 struct super_block *sb = dir->i_sb;
80 struct f2fs_sb_info *sbi = F2FS_SB(sb);
82 if (IS_CASEFOLDED(dir)) {
83 fname->cf_name.name = f2fs_kmalloc(sbi, F2FS_NAME_LEN,
85 if (!fname->cf_name.name)
87 fname->cf_name.len = utf8_casefold(sb->s_encoding,
91 if ((int)fname->cf_name.len <= 0) {
92 kfree(fname->cf_name.name);
93 fname->cf_name.name = NULL;
94 if (sb_has_strict_encoding(sb))
96 /* fall back to treating name as opaque byte sequence */
103 static int __f2fs_setup_filename(const struct inode *dir,
104 const struct fscrypt_name *crypt_name,
105 struct f2fs_filename *fname)
109 memset(fname, 0, sizeof(*fname));
111 fname->usr_fname = crypt_name->usr_fname;
112 fname->disk_name = crypt_name->disk_name;
113 #ifdef CONFIG_FS_ENCRYPTION
114 fname->crypto_buf = crypt_name->crypto_buf;
116 if (crypt_name->is_nokey_name) {
117 /* hash was decoded from the no-key name */
118 fname->hash = cpu_to_le32(crypt_name->hash);
120 err = f2fs_init_casefolded_name(dir, fname);
122 f2fs_free_filename(fname);
125 f2fs_hash_filename(dir, fname);
131 * Prepare to search for @iname in @dir. This is similar to
132 * fscrypt_setup_filename(), but this also handles computing the casefolded name
133 * and the f2fs dirhash if needed, then packing all the information about this
134 * filename up into a 'struct f2fs_filename'.
136 int f2fs_setup_filename(struct inode *dir, const struct qstr *iname,
137 int lookup, struct f2fs_filename *fname)
139 struct fscrypt_name crypt_name;
142 err = fscrypt_setup_filename(dir, iname, lookup, &crypt_name);
146 return __f2fs_setup_filename(dir, &crypt_name, fname);
150 * Prepare to look up @dentry in @dir. This is similar to
151 * fscrypt_prepare_lookup(), but this also handles computing the casefolded name
152 * and the f2fs dirhash if needed, then packing all the information about this
153 * filename up into a 'struct f2fs_filename'.
155 int f2fs_prepare_lookup(struct inode *dir, struct dentry *dentry,
156 struct f2fs_filename *fname)
158 struct fscrypt_name crypt_name;
161 err = fscrypt_prepare_lookup(dir, dentry, &crypt_name);
165 return __f2fs_setup_filename(dir, &crypt_name, fname);
168 void f2fs_free_filename(struct f2fs_filename *fname)
170 #ifdef CONFIG_FS_ENCRYPTION
171 kfree(fname->crypto_buf.name);
172 fname->crypto_buf.name = NULL;
174 #ifdef CONFIG_UNICODE
175 kfree(fname->cf_name.name);
176 fname->cf_name.name = NULL;
180 static unsigned long dir_block_index(unsigned int level,
181 int dir_level, unsigned int idx)
184 unsigned long bidx = 0;
186 for (i = 0; i < level; i++)
187 bidx += dir_buckets(i, dir_level) * bucket_blocks(i);
188 bidx += idx * bucket_blocks(level);
192 static struct f2fs_dir_entry *find_in_block(struct inode *dir,
193 struct page *dentry_page,
194 const struct f2fs_filename *fname,
197 struct f2fs_dentry_block *dentry_blk;
198 struct f2fs_dentry_ptr d;
200 dentry_blk = (struct f2fs_dentry_block *)page_address(dentry_page);
202 make_dentry_ptr_block(dir, &d, dentry_blk);
203 return f2fs_find_target_dentry(&d, fname, max_slots);
206 #ifdef CONFIG_UNICODE
208 * Test whether a case-insensitive directory entry matches the filename
209 * being searched for.
211 * Returns 1 for a match, 0 for no match, and -errno on an error.
213 static int f2fs_match_ci_name(const struct inode *dir, const struct qstr *name,
214 const u8 *de_name, u32 de_name_len)
216 const struct super_block *sb = dir->i_sb;
217 const struct unicode_map *um = sb->s_encoding;
218 struct fscrypt_str decrypted_name = FSTR_INIT(NULL, de_name_len);
219 struct qstr entry = QSTR_INIT(de_name, de_name_len);
222 if (IS_ENCRYPTED(dir)) {
223 const struct fscrypt_str encrypted_name =
224 FSTR_INIT((u8 *)de_name, de_name_len);
226 if (WARN_ON_ONCE(!fscrypt_has_encryption_key(dir)))
229 decrypted_name.name = kmalloc(de_name_len, GFP_KERNEL);
230 if (!decrypted_name.name)
232 res = fscrypt_fname_disk_to_usr(dir, 0, 0, &encrypted_name,
236 entry.name = decrypted_name.name;
237 entry.len = decrypted_name.len;
240 res = utf8_strncasecmp_folded(um, name, &entry);
242 * In strict mode, ignore invalid names. In non-strict mode,
243 * fall back to treating them as opaque byte sequences.
245 if (res < 0 && !sb_has_strict_encoding(sb)) {
246 res = name->len == entry.len &&
247 memcmp(name->name, entry.name, name->len) == 0;
249 /* utf8_strncasecmp_folded returns 0 on match */
253 kfree(decrypted_name.name);
256 #endif /* CONFIG_UNICODE */
258 static inline int f2fs_match_name(const struct inode *dir,
259 const struct f2fs_filename *fname,
260 const u8 *de_name, u32 de_name_len)
262 struct fscrypt_name f;
264 #ifdef CONFIG_UNICODE
265 if (fname->cf_name.name) {
266 struct qstr cf = FSTR_TO_QSTR(&fname->cf_name);
268 return f2fs_match_ci_name(dir, &cf, de_name, de_name_len);
271 f.usr_fname = fname->usr_fname;
272 f.disk_name = fname->disk_name;
273 #ifdef CONFIG_FS_ENCRYPTION
274 f.crypto_buf = fname->crypto_buf;
276 return fscrypt_match_name(&f, de_name, de_name_len);
279 struct f2fs_dir_entry *f2fs_find_target_dentry(const struct f2fs_dentry_ptr *d,
280 const struct f2fs_filename *fname, int *max_slots)
282 struct f2fs_dir_entry *de;
283 unsigned long bit_pos = 0;
289 while (bit_pos < d->max) {
290 if (!test_bit_le(bit_pos, d->bitmap)) {
296 de = &d->dentry[bit_pos];
298 if (unlikely(!de->name_len)) {
303 if (de->hash_code == fname->hash) {
304 res = f2fs_match_name(d->inode, fname,
305 d->filename[bit_pos],
306 le16_to_cpu(de->name_len));
313 if (max_slots && max_len > *max_slots)
314 *max_slots = max_len;
317 bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
322 if (max_slots && max_len > *max_slots)
323 *max_slots = max_len;
327 static struct f2fs_dir_entry *find_in_level(struct inode *dir,
329 const struct f2fs_filename *fname,
330 struct page **res_page)
332 int s = GET_DENTRY_SLOTS(fname->disk_name.len);
333 unsigned int nbucket, nblock;
334 unsigned int bidx, end_block;
335 struct page *dentry_page;
336 struct f2fs_dir_entry *de = NULL;
340 nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level);
341 nblock = bucket_blocks(level);
343 bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level,
344 le32_to_cpu(fname->hash) % nbucket);
345 end_block = bidx + nblock;
347 for (; bidx < end_block; bidx++) {
348 /* no need to allocate new dentry pages to all the indices */
349 dentry_page = f2fs_find_data_page(dir, bidx);
350 if (IS_ERR(dentry_page)) {
351 if (PTR_ERR(dentry_page) == -ENOENT) {
355 *res_page = dentry_page;
360 de = find_in_block(dir, dentry_page, fname, &max_slots);
362 *res_page = ERR_CAST(de);
366 *res_page = dentry_page;
372 f2fs_put_page(dentry_page, 0);
375 if (!de && room && F2FS_I(dir)->chash != fname->hash) {
376 F2FS_I(dir)->chash = fname->hash;
377 F2FS_I(dir)->clevel = level;
383 struct f2fs_dir_entry *__f2fs_find_entry(struct inode *dir,
384 const struct f2fs_filename *fname,
385 struct page **res_page)
387 unsigned long npages = dir_blocks(dir);
388 struct f2fs_dir_entry *de = NULL;
389 unsigned int max_depth;
394 if (f2fs_has_inline_dentry(dir)) {
395 de = f2fs_find_in_inline_dir(dir, fname, res_page);
402 max_depth = F2FS_I(dir)->i_current_depth;
403 if (unlikely(max_depth > MAX_DIR_HASH_DEPTH)) {
404 f2fs_warn(F2FS_I_SB(dir), "Corrupted max_depth of %lu: %u",
405 dir->i_ino, max_depth);
406 max_depth = MAX_DIR_HASH_DEPTH;
407 f2fs_i_depth_write(dir, max_depth);
410 for (level = 0; level < max_depth; level++) {
411 de = find_in_level(dir, level, fname, res_page);
412 if (de || IS_ERR(*res_page))
416 /* This is to increase the speed of f2fs_create */
418 F2FS_I(dir)->task = current;
423 * Find an entry in the specified directory with the wanted name.
424 * It returns the page where the entry was found (as a parameter - res_page),
425 * and the entry itself. Page is returned mapped and unlocked.
426 * Entry is guaranteed to be valid.
428 struct f2fs_dir_entry *f2fs_find_entry(struct inode *dir,
429 const struct qstr *child, struct page **res_page)
431 struct f2fs_dir_entry *de = NULL;
432 struct f2fs_filename fname;
435 err = f2fs_setup_filename(dir, child, 1, &fname);
440 *res_page = ERR_PTR(err);
444 de = __f2fs_find_entry(dir, &fname, res_page);
446 f2fs_free_filename(&fname);
450 struct f2fs_dir_entry *f2fs_parent_dir(struct inode *dir, struct page **p)
452 return f2fs_find_entry(dir, &dotdot_name, p);
455 ino_t f2fs_inode_by_name(struct inode *dir, const struct qstr *qstr,
459 struct f2fs_dir_entry *de;
461 de = f2fs_find_entry(dir, qstr, page);
463 res = le32_to_cpu(de->ino);
464 f2fs_put_page(*page, 0);
470 void f2fs_set_link(struct inode *dir, struct f2fs_dir_entry *de,
471 struct page *page, struct inode *inode)
473 enum page_type type = f2fs_has_inline_dentry(dir) ? NODE : DATA;
476 f2fs_wait_on_page_writeback(page, type, true, true);
477 de->ino = cpu_to_le32(inode->i_ino);
478 set_de_type(de, inode->i_mode);
479 set_page_dirty(page);
481 dir->i_mtime = dir->i_ctime = current_time(dir);
482 f2fs_mark_inode_dirty_sync(dir, false);
483 f2fs_put_page(page, 1);
486 static void init_dent_inode(struct inode *dir, struct inode *inode,
487 const struct f2fs_filename *fname,
490 struct f2fs_inode *ri;
492 if (!fname) /* tmpfile case? */
495 f2fs_wait_on_page_writeback(ipage, NODE, true, true);
497 /* copy name info. to this inode page */
498 ri = F2FS_INODE(ipage);
499 ri->i_namelen = cpu_to_le32(fname->disk_name.len);
500 memcpy(ri->i_name, fname->disk_name.name, fname->disk_name.len);
501 if (IS_ENCRYPTED(dir)) {
502 file_set_enc_name(inode);
504 * Roll-forward recovery doesn't have encryption keys available,
505 * so it can't compute the dirhash for encrypted+casefolded
506 * filenames. Append it to i_name if possible. Else, disable
507 * roll-forward recovery of the dentry (i.e., make fsync'ing the
508 * file force a checkpoint) by setting LOST_PINO.
510 if (IS_CASEFOLDED(dir)) {
511 if (fname->disk_name.len + sizeof(f2fs_hash_t) <=
513 put_unaligned(fname->hash, (f2fs_hash_t *)
514 &ri->i_name[fname->disk_name.len]);
516 file_lost_pino(inode);
519 set_page_dirty(ipage);
522 void f2fs_do_make_empty_dir(struct inode *inode, struct inode *parent,
523 struct f2fs_dentry_ptr *d)
525 struct fscrypt_str dot = FSTR_INIT(".", 1);
526 struct fscrypt_str dotdot = FSTR_INIT("..", 2);
528 /* update dirent of "." */
529 f2fs_update_dentry(inode->i_ino, inode->i_mode, d, &dot, 0, 0);
531 /* update dirent of ".." */
532 f2fs_update_dentry(parent->i_ino, parent->i_mode, d, &dotdot, 0, 1);
535 static int make_empty_dir(struct inode *inode,
536 struct inode *parent, struct page *page)
538 struct page *dentry_page;
539 struct f2fs_dentry_block *dentry_blk;
540 struct f2fs_dentry_ptr d;
542 if (f2fs_has_inline_dentry(inode))
543 return f2fs_make_empty_inline_dir(inode, parent, page);
545 dentry_page = f2fs_get_new_data_page(inode, page, 0, true);
546 if (IS_ERR(dentry_page))
547 return PTR_ERR(dentry_page);
549 dentry_blk = page_address(dentry_page);
551 make_dentry_ptr_block(NULL, &d, dentry_blk);
552 f2fs_do_make_empty_dir(inode, parent, &d);
554 set_page_dirty(dentry_page);
555 f2fs_put_page(dentry_page, 1);
559 struct page *f2fs_init_inode_metadata(struct inode *inode, struct inode *dir,
560 const struct f2fs_filename *fname, struct page *dpage)
565 if (is_inode_flag_set(inode, FI_NEW_INODE)) {
566 page = f2fs_new_inode_page(inode);
570 if (S_ISDIR(inode->i_mode)) {
571 /* in order to handle error case */
573 err = make_empty_dir(inode, dir, page);
581 err = f2fs_init_acl(inode, dir, page, dpage);
585 err = f2fs_init_security(inode, dir,
586 fname ? fname->usr_fname : NULL, page);
590 if (IS_ENCRYPTED(inode)) {
591 err = fscrypt_set_context(inode, page);
596 page = f2fs_get_node_page(F2FS_I_SB(dir), inode->i_ino);
601 init_dent_inode(dir, inode, fname, page);
604 * This file should be checkpointed during fsync.
605 * We lost i_pino from now on.
607 if (is_inode_flag_set(inode, FI_INC_LINK)) {
608 if (!S_ISDIR(inode->i_mode))
609 file_lost_pino(inode);
611 * If link the tmpfile to alias through linkat path,
612 * we should remove this inode from orphan list.
614 if (inode->i_nlink == 0)
615 f2fs_remove_orphan_inode(F2FS_I_SB(dir), inode->i_ino);
616 f2fs_i_links_write(inode, true);
622 f2fs_update_inode(inode, page);
623 f2fs_put_page(page, 1);
627 void f2fs_update_parent_metadata(struct inode *dir, struct inode *inode,
628 unsigned int current_depth)
630 if (inode && is_inode_flag_set(inode, FI_NEW_INODE)) {
631 if (S_ISDIR(inode->i_mode))
632 f2fs_i_links_write(dir, true);
633 clear_inode_flag(inode, FI_NEW_INODE);
635 dir->i_mtime = dir->i_ctime = current_time(dir);
636 f2fs_mark_inode_dirty_sync(dir, false);
638 if (F2FS_I(dir)->i_current_depth != current_depth)
639 f2fs_i_depth_write(dir, current_depth);
641 if (inode && is_inode_flag_set(inode, FI_INC_LINK))
642 clear_inode_flag(inode, FI_INC_LINK);
645 int f2fs_room_for_filename(const void *bitmap, int slots, int max_slots)
648 int zero_start, zero_end;
650 zero_start = find_next_zero_bit_le(bitmap, max_slots, bit_start);
651 if (zero_start >= max_slots)
654 zero_end = find_next_bit_le(bitmap, max_slots, zero_start);
655 if (zero_end - zero_start >= slots)
658 bit_start = zero_end + 1;
660 if (zero_end + 1 >= max_slots)
665 bool f2fs_has_enough_room(struct inode *dir, struct page *ipage,
666 const struct f2fs_filename *fname)
668 struct f2fs_dentry_ptr d;
669 unsigned int bit_pos;
670 int slots = GET_DENTRY_SLOTS(fname->disk_name.len);
672 make_dentry_ptr_inline(dir, &d, inline_data_addr(dir, ipage));
674 bit_pos = f2fs_room_for_filename(d.bitmap, slots, d.max);
676 return bit_pos < d.max;
679 void f2fs_update_dentry(nid_t ino, umode_t mode, struct f2fs_dentry_ptr *d,
680 const struct fscrypt_str *name, f2fs_hash_t name_hash,
681 unsigned int bit_pos)
683 struct f2fs_dir_entry *de;
684 int slots = GET_DENTRY_SLOTS(name->len);
687 de = &d->dentry[bit_pos];
688 de->hash_code = name_hash;
689 de->name_len = cpu_to_le16(name->len);
690 memcpy(d->filename[bit_pos], name->name, name->len);
691 de->ino = cpu_to_le32(ino);
692 set_de_type(de, mode);
693 for (i = 0; i < slots; i++) {
694 __set_bit_le(bit_pos + i, (void *)d->bitmap);
695 /* avoid wrong garbage data for readdir */
697 (de + i)->name_len = 0;
701 int f2fs_add_regular_entry(struct inode *dir, const struct f2fs_filename *fname,
702 struct inode *inode, nid_t ino, umode_t mode)
704 unsigned int bit_pos;
706 unsigned int current_depth;
707 unsigned long bidx, block;
708 unsigned int nbucket, nblock;
709 struct page *dentry_page = NULL;
710 struct f2fs_dentry_block *dentry_blk = NULL;
711 struct f2fs_dentry_ptr d;
712 struct page *page = NULL;
716 slots = GET_DENTRY_SLOTS(fname->disk_name.len);
718 current_depth = F2FS_I(dir)->i_current_depth;
719 if (F2FS_I(dir)->chash == fname->hash) {
720 level = F2FS_I(dir)->clevel;
721 F2FS_I(dir)->chash = 0;
725 if (time_to_inject(F2FS_I_SB(dir), FAULT_DIR_DEPTH)) {
726 f2fs_show_injection_info(F2FS_I_SB(dir), FAULT_DIR_DEPTH);
730 if (unlikely(current_depth == MAX_DIR_HASH_DEPTH))
733 /* Increase the depth, if required */
734 if (level == current_depth)
737 nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level);
738 nblock = bucket_blocks(level);
740 bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level,
741 (le32_to_cpu(fname->hash) % nbucket));
743 for (block = bidx; block <= (bidx + nblock - 1); block++) {
744 dentry_page = f2fs_get_new_data_page(dir, NULL, block, true);
745 if (IS_ERR(dentry_page))
746 return PTR_ERR(dentry_page);
748 dentry_blk = page_address(dentry_page);
749 bit_pos = f2fs_room_for_filename(&dentry_blk->dentry_bitmap,
750 slots, NR_DENTRY_IN_BLOCK);
751 if (bit_pos < NR_DENTRY_IN_BLOCK)
754 f2fs_put_page(dentry_page, 1);
757 /* Move to next level to find the empty slot for new dentry */
761 f2fs_wait_on_page_writeback(dentry_page, DATA, true, true);
764 down_write(&F2FS_I(inode)->i_sem);
765 page = f2fs_init_inode_metadata(inode, dir, fname, NULL);
772 make_dentry_ptr_block(NULL, &d, dentry_blk);
773 f2fs_update_dentry(ino, mode, &d, &fname->disk_name, fname->hash,
776 set_page_dirty(dentry_page);
779 f2fs_i_pino_write(inode, dir->i_ino);
781 /* synchronize inode page's data from inode cache */
782 if (is_inode_flag_set(inode, FI_NEW_INODE))
783 f2fs_update_inode(inode, page);
785 f2fs_put_page(page, 1);
788 f2fs_update_parent_metadata(dir, inode, current_depth);
791 up_write(&F2FS_I(inode)->i_sem);
793 f2fs_put_page(dentry_page, 1);
798 int f2fs_add_dentry(struct inode *dir, const struct f2fs_filename *fname,
799 struct inode *inode, nid_t ino, umode_t mode)
803 if (f2fs_has_inline_dentry(dir))
804 err = f2fs_add_inline_entry(dir, fname, inode, ino, mode);
806 err = f2fs_add_regular_entry(dir, fname, inode, ino, mode);
808 f2fs_update_time(F2FS_I_SB(dir), REQ_TIME);
813 * Caller should grab and release a rwsem by calling f2fs_lock_op() and
816 int f2fs_do_add_link(struct inode *dir, const struct qstr *name,
817 struct inode *inode, nid_t ino, umode_t mode)
819 struct f2fs_filename fname;
820 struct page *page = NULL;
821 struct f2fs_dir_entry *de = NULL;
824 err = f2fs_setup_filename(dir, name, 0, &fname);
829 * An immature stackable filesystem shows a race condition between lookup
830 * and create. If we have same task when doing lookup and create, it's
831 * definitely fine as expected by VFS normally. Otherwise, let's just
832 * verify on-disk dentry one more time, which guarantees filesystem
835 if (current != F2FS_I(dir)->task) {
836 de = __f2fs_find_entry(dir, &fname, &page);
837 F2FS_I(dir)->task = NULL;
840 f2fs_put_page(page, 0);
842 } else if (IS_ERR(page)) {
845 err = f2fs_add_dentry(dir, &fname, inode, ino, mode);
847 f2fs_free_filename(&fname);
851 int f2fs_do_tmpfile(struct inode *inode, struct inode *dir)
856 down_write(&F2FS_I(inode)->i_sem);
857 page = f2fs_init_inode_metadata(inode, dir, NULL, NULL);
862 f2fs_put_page(page, 1);
864 clear_inode_flag(inode, FI_NEW_INODE);
865 f2fs_update_time(F2FS_I_SB(inode), REQ_TIME);
867 up_write(&F2FS_I(inode)->i_sem);
871 void f2fs_drop_nlink(struct inode *dir, struct inode *inode)
873 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
875 down_write(&F2FS_I(inode)->i_sem);
877 if (S_ISDIR(inode->i_mode))
878 f2fs_i_links_write(dir, false);
879 inode->i_ctime = current_time(inode);
881 f2fs_i_links_write(inode, false);
882 if (S_ISDIR(inode->i_mode)) {
883 f2fs_i_links_write(inode, false);
884 f2fs_i_size_write(inode, 0);
886 up_write(&F2FS_I(inode)->i_sem);
888 if (inode->i_nlink == 0)
889 f2fs_add_orphan_inode(inode);
891 f2fs_release_orphan_inode(sbi);
895 * It only removes the dentry from the dentry page, corresponding name
896 * entry in name page does not need to be touched during deletion.
898 void f2fs_delete_entry(struct f2fs_dir_entry *dentry, struct page *page,
899 struct inode *dir, struct inode *inode)
901 struct f2fs_dentry_block *dentry_blk;
902 unsigned int bit_pos;
903 int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len));
906 f2fs_update_time(F2FS_I_SB(dir), REQ_TIME);
908 if (F2FS_OPTION(F2FS_I_SB(dir)).fsync_mode == FSYNC_MODE_STRICT)
909 f2fs_add_ino_entry(F2FS_I_SB(dir), dir->i_ino, TRANS_DIR_INO);
911 if (f2fs_has_inline_dentry(dir))
912 return f2fs_delete_inline_entry(dentry, page, dir, inode);
915 f2fs_wait_on_page_writeback(page, DATA, true, true);
917 dentry_blk = page_address(page);
918 bit_pos = dentry - dentry_blk->dentry;
919 for (i = 0; i < slots; i++)
920 __clear_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap);
922 /* Let's check and deallocate this dentry page */
923 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
926 set_page_dirty(page);
928 if (bit_pos == NR_DENTRY_IN_BLOCK &&
929 !f2fs_truncate_hole(dir, page->index, page->index + 1)) {
930 f2fs_clear_page_cache_dirty_tag(page);
931 clear_page_dirty_for_io(page);
932 f2fs_clear_page_private(page);
933 ClearPageUptodate(page);
934 clear_cold_data(page);
935 inode_dec_dirty_pages(dir);
936 f2fs_remove_dirty_inode(dir);
938 f2fs_put_page(page, 1);
940 dir->i_ctime = dir->i_mtime = current_time(dir);
941 f2fs_mark_inode_dirty_sync(dir, false);
944 f2fs_drop_nlink(dir, inode);
947 bool f2fs_empty_dir(struct inode *dir)
950 struct page *dentry_page;
951 unsigned int bit_pos;
952 struct f2fs_dentry_block *dentry_blk;
953 unsigned long nblock = dir_blocks(dir);
955 if (f2fs_has_inline_dentry(dir))
956 return f2fs_empty_inline_dir(dir);
958 for (bidx = 0; bidx < nblock; bidx++) {
959 dentry_page = f2fs_get_lock_data_page(dir, bidx, false);
960 if (IS_ERR(dentry_page)) {
961 if (PTR_ERR(dentry_page) == -ENOENT)
967 dentry_blk = page_address(dentry_page);
972 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
976 f2fs_put_page(dentry_page, 1);
978 if (bit_pos < NR_DENTRY_IN_BLOCK)
984 int f2fs_fill_dentries(struct dir_context *ctx, struct f2fs_dentry_ptr *d,
985 unsigned int start_pos, struct fscrypt_str *fstr)
987 unsigned char d_type = DT_UNKNOWN;
988 unsigned int bit_pos;
989 struct f2fs_dir_entry *de = NULL;
990 struct fscrypt_str de_name = FSTR_INIT(NULL, 0);
991 struct f2fs_sb_info *sbi = F2FS_I_SB(d->inode);
992 struct blk_plug plug;
993 bool readdir_ra = sbi->readdir_ra == 1;
996 bit_pos = ((unsigned long)ctx->pos % d->max);
999 blk_start_plug(&plug);
1001 while (bit_pos < d->max) {
1002 bit_pos = find_next_bit_le(d->bitmap, d->max, bit_pos);
1003 if (bit_pos >= d->max)
1006 de = &d->dentry[bit_pos];
1007 if (de->name_len == 0) {
1009 ctx->pos = start_pos + bit_pos;
1011 "%sF2FS-fs (%s): invalid namelen(0), ino:%u, run fsck to fix.",
1012 KERN_WARNING, sbi->sb->s_id,
1013 le32_to_cpu(de->ino));
1014 set_sbi_flag(sbi, SBI_NEED_FSCK);
1018 d_type = f2fs_get_de_type(de);
1020 de_name.name = d->filename[bit_pos];
1021 de_name.len = le16_to_cpu(de->name_len);
1023 /* check memory boundary before moving forward */
1024 bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
1025 if (unlikely(bit_pos > d->max ||
1026 le16_to_cpu(de->name_len) > F2FS_NAME_LEN)) {
1027 f2fs_warn(sbi, "%s: corrupted namelen=%d, run fsck to fix.",
1028 __func__, le16_to_cpu(de->name_len));
1029 set_sbi_flag(sbi, SBI_NEED_FSCK);
1030 err = -EFSCORRUPTED;
1034 if (IS_ENCRYPTED(d->inode)) {
1035 int save_len = fstr->len;
1037 err = fscrypt_fname_disk_to_usr(d->inode,
1038 (u32)le32_to_cpu(de->hash_code),
1044 fstr->len = save_len;
1047 if (!dir_emit(ctx, de_name.name, de_name.len,
1048 le32_to_cpu(de->ino), d_type)) {
1054 f2fs_ra_node_page(sbi, le32_to_cpu(de->ino));
1056 ctx->pos = start_pos + bit_pos;
1060 blk_finish_plug(&plug);
1064 static int f2fs_readdir(struct file *file, struct dir_context *ctx)
1066 struct inode *inode = file_inode(file);
1067 unsigned long npages = dir_blocks(inode);
1068 struct f2fs_dentry_block *dentry_blk = NULL;
1069 struct page *dentry_page = NULL;
1070 struct file_ra_state *ra = &file->f_ra;
1071 loff_t start_pos = ctx->pos;
1072 unsigned int n = ((unsigned long)ctx->pos / NR_DENTRY_IN_BLOCK);
1073 struct f2fs_dentry_ptr d;
1074 struct fscrypt_str fstr = FSTR_INIT(NULL, 0);
1077 if (IS_ENCRYPTED(inode)) {
1078 err = fscrypt_prepare_readdir(inode);
1082 err = fscrypt_fname_alloc_buffer(F2FS_NAME_LEN, &fstr);
1087 if (f2fs_has_inline_dentry(inode)) {
1088 err = f2fs_read_inline_dir(file, ctx, &fstr);
1092 for (; n < npages; n++, ctx->pos = n * NR_DENTRY_IN_BLOCK) {
1094 /* allow readdir() to be interrupted */
1095 if (fatal_signal_pending(current)) {
1101 /* readahead for multi pages of dir */
1102 if (npages - n > 1 && !ra_has_index(ra, n))
1103 page_cache_sync_readahead(inode->i_mapping, ra, file, n,
1104 min(npages - n, (pgoff_t)MAX_DIR_RA_PAGES));
1106 dentry_page = f2fs_find_data_page(inode, n);
1107 if (IS_ERR(dentry_page)) {
1108 err = PTR_ERR(dentry_page);
1109 if (err == -ENOENT) {
1117 dentry_blk = page_address(dentry_page);
1119 make_dentry_ptr_block(inode, &d, dentry_blk);
1121 err = f2fs_fill_dentries(ctx, &d,
1122 n * NR_DENTRY_IN_BLOCK, &fstr);
1124 f2fs_put_page(dentry_page, 0);
1128 f2fs_put_page(dentry_page, 0);
1131 fscrypt_fname_free_buffer(&fstr);
1133 trace_f2fs_readdir(inode, start_pos, ctx->pos, err);
1134 return err < 0 ? err : 0;
1137 const struct file_operations f2fs_dir_operations = {
1138 .llseek = generic_file_llseek,
1139 .read = generic_read_dir,
1140 .iterate_shared = f2fs_readdir,
1141 .fsync = f2fs_sync_file,
1142 .unlocked_ioctl = f2fs_ioctl,
1143 #ifdef CONFIG_COMPAT
1144 .compat_ioctl = f2fs_compat_ioctl,