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_CACHE_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,
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, struct inode *inode)
64 umode_t mode = inode->i_mode;
65 de->file_type = f2fs_type_by_mode[(mode & S_IFMT) >> S_SHIFT];
68 static unsigned long dir_block_index(unsigned int level,
69 int dir_level, unsigned int idx)
72 unsigned long bidx = 0;
74 for (i = 0; i < level; i++)
75 bidx += dir_buckets(i, dir_level) * bucket_blocks(i);
76 bidx += idx * bucket_blocks(level);
80 static bool early_match_name(size_t namelen, f2fs_hash_t namehash,
81 struct f2fs_dir_entry *de)
83 if (le16_to_cpu(de->name_len) != namelen)
86 if (de->hash_code != namehash)
92 static struct f2fs_dir_entry *find_in_block(struct page *dentry_page,
93 struct qstr *name, int *max_slots,
94 f2fs_hash_t namehash, struct page **res_page)
96 struct f2fs_dir_entry *de;
97 unsigned long bit_pos = 0;
98 struct f2fs_dentry_block *dentry_blk = kmap(dentry_page);
99 const void *dentry_bits = &dentry_blk->dentry_bitmap;
102 while (bit_pos < NR_DENTRY_IN_BLOCK) {
103 if (!test_bit_le(bit_pos, dentry_bits)) {
106 else if (!test_bit_le(bit_pos - 1, dentry_bits))
111 de = &dentry_blk->dentry[bit_pos];
112 if (early_match_name(name->len, namehash, de)) {
113 if (!memcmp(dentry_blk->filename[bit_pos],
116 *res_page = dentry_page;
120 if (max_len > *max_slots) {
121 *max_slots = max_len;
124 bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
130 if (max_len > *max_slots)
131 *max_slots = max_len;
135 static struct f2fs_dir_entry *find_in_level(struct inode *dir,
136 unsigned int level, struct qstr *name,
137 f2fs_hash_t namehash, struct page **res_page)
139 int s = GET_DENTRY_SLOTS(name->len);
140 unsigned int nbucket, nblock;
141 unsigned int bidx, end_block;
142 struct page *dentry_page;
143 struct f2fs_dir_entry *de = NULL;
147 f2fs_bug_on(level > MAX_DIR_HASH_DEPTH);
149 nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level);
150 nblock = bucket_blocks(level);
152 bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level,
153 le32_to_cpu(namehash) % nbucket);
154 end_block = bidx + nblock;
156 for (; bidx < end_block; bidx++) {
157 /* no need to allocate new dentry pages to all the indices */
158 dentry_page = find_data_page(dir, bidx, true);
159 if (IS_ERR(dentry_page)) {
164 de = find_in_block(dentry_page, name, &max_slots,
171 f2fs_put_page(dentry_page, 0);
174 if (!de && room && F2FS_I(dir)->chash != namehash) {
175 F2FS_I(dir)->chash = namehash;
176 F2FS_I(dir)->clevel = level;
183 * Find an entry in the specified directory with the wanted name.
184 * It returns the page where the entry was found (as a parameter - res_page),
185 * and the entry itself. Page is returned mapped and unlocked.
186 * Entry is guaranteed to be valid.
188 struct f2fs_dir_entry *f2fs_find_entry(struct inode *dir,
189 struct qstr *child, struct page **res_page)
191 unsigned long npages = dir_blocks(dir);
192 struct f2fs_dir_entry *de = NULL;
193 f2fs_hash_t name_hash;
194 unsigned int max_depth;
202 name_hash = f2fs_dentry_hash(child);
203 max_depth = F2FS_I(dir)->i_current_depth;
205 for (level = 0; level < max_depth; level++) {
206 de = find_in_level(dir, level, child, name_hash, res_page);
210 if (!de && F2FS_I(dir)->chash != name_hash) {
211 F2FS_I(dir)->chash = name_hash;
212 F2FS_I(dir)->clevel = level - 1;
217 struct f2fs_dir_entry *f2fs_parent_dir(struct inode *dir, struct page **p)
220 struct f2fs_dir_entry *de;
221 struct f2fs_dentry_block *dentry_blk;
223 page = get_lock_data_page(dir, 0);
227 dentry_blk = kmap(page);
228 de = &dentry_blk->dentry[1];
234 ino_t f2fs_inode_by_name(struct inode *dir, struct qstr *qstr)
237 struct f2fs_dir_entry *de;
240 de = f2fs_find_entry(dir, qstr, &page);
242 res = le32_to_cpu(de->ino);
244 f2fs_put_page(page, 0);
250 void f2fs_set_link(struct inode *dir, struct f2fs_dir_entry *de,
251 struct page *page, struct inode *inode)
254 f2fs_wait_on_page_writeback(page, DATA);
255 de->ino = cpu_to_le32(inode->i_ino);
256 set_de_type(de, inode);
258 set_page_dirty(page);
259 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
260 mark_inode_dirty(dir);
262 f2fs_put_page(page, 1);
265 static void init_dent_inode(const struct qstr *name, struct page *ipage)
267 struct f2fs_inode *ri;
269 f2fs_wait_on_page_writeback(ipage, NODE);
271 /* copy name info. to this inode page */
272 ri = F2FS_INODE(ipage);
273 ri->i_namelen = cpu_to_le32(name->len);
274 memcpy(ri->i_name, name->name, name->len);
275 set_page_dirty(ipage);
278 int update_dent_inode(struct inode *inode, const struct qstr *name)
280 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
283 page = get_node_page(sbi, inode->i_ino);
285 return PTR_ERR(page);
287 init_dent_inode(name, page);
288 f2fs_put_page(page, 1);
293 static int make_empty_dir(struct inode *inode,
294 struct inode *parent, struct page *page)
296 struct page *dentry_page;
297 struct f2fs_dentry_block *dentry_blk;
298 struct f2fs_dir_entry *de;
300 dentry_page = get_new_data_page(inode, page, 0, true);
301 if (IS_ERR(dentry_page))
302 return PTR_ERR(dentry_page);
305 dentry_blk = kmap_atomic(dentry_page);
307 de = &dentry_blk->dentry[0];
308 de->name_len = cpu_to_le16(1);
310 de->ino = cpu_to_le32(inode->i_ino);
311 memcpy(dentry_blk->filename[0], ".", 1);
312 set_de_type(de, inode);
314 de = &dentry_blk->dentry[1];
316 de->name_len = cpu_to_le16(2);
317 de->ino = cpu_to_le32(parent->i_ino);
318 memcpy(dentry_blk->filename[1], "..", 2);
319 set_de_type(de, inode);
321 test_and_set_bit_le(0, &dentry_blk->dentry_bitmap);
322 test_and_set_bit_le(1, &dentry_blk->dentry_bitmap);
323 kunmap_atomic(dentry_blk);
325 set_page_dirty(dentry_page);
326 f2fs_put_page(dentry_page, 1);
330 static struct page *init_inode_metadata(struct inode *inode,
331 struct inode *dir, const struct qstr *name)
333 struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
337 if (is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) {
338 page = new_inode_page(inode);
342 if (S_ISDIR(inode->i_mode)) {
343 err = make_empty_dir(inode, dir, page);
348 err = f2fs_init_acl(inode, dir, page);
352 err = f2fs_init_security(inode, dir, name, page);
356 page = get_node_page(F2FS_SB(dir->i_sb), inode->i_ino);
360 set_cold_node(inode, page);
364 init_dent_inode(name, page);
367 * This file should be checkpointed during fsync.
368 * We lost i_pino from now on.
370 if (is_inode_flag_set(F2FS_I(inode), FI_INC_LINK)) {
371 file_lost_pino(inode);
373 * If link the tmpfile to alias through linkat path,
374 * we should remove this inode from orphan list.
376 if (inode->i_nlink == 0)
377 remove_orphan_inode(sbi, inode->i_ino);
383 f2fs_put_page(page, 1);
385 /* once the failed inode becomes a bad inode, i_mode is S_IFREG */
386 truncate_inode_pages(&inode->i_data, 0);
387 truncate_blocks(inode, 0);
388 remove_dirty_dir_inode(inode);
389 remove_inode_page(inode);
393 static void update_parent_metadata(struct inode *dir, struct inode *inode,
394 unsigned int current_depth)
396 if (is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) {
397 if (S_ISDIR(inode->i_mode)) {
399 set_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
401 clear_inode_flag(F2FS_I(inode), FI_NEW_INODE);
403 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
404 mark_inode_dirty(dir);
406 if (F2FS_I(dir)->i_current_depth != current_depth) {
407 F2FS_I(dir)->i_current_depth = current_depth;
408 set_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
411 if (is_inode_flag_set(F2FS_I(inode), FI_INC_LINK))
412 clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
415 static int room_for_filename(struct f2fs_dentry_block *dentry_blk, int slots)
418 int zero_start, zero_end;
420 zero_start = find_next_zero_bit_le(&dentry_blk->dentry_bitmap,
423 if (zero_start >= NR_DENTRY_IN_BLOCK)
424 return NR_DENTRY_IN_BLOCK;
426 zero_end = find_next_bit_le(&dentry_blk->dentry_bitmap,
429 if (zero_end - zero_start >= slots)
432 bit_start = zero_end + 1;
434 if (zero_end + 1 >= NR_DENTRY_IN_BLOCK)
435 return NR_DENTRY_IN_BLOCK;
440 * Caller should grab and release a rwsem by calling f2fs_lock_op() and
443 int __f2fs_add_link(struct inode *dir, const struct qstr *name,
446 unsigned int bit_pos;
448 unsigned int current_depth;
449 unsigned long bidx, block;
450 f2fs_hash_t dentry_hash;
451 struct f2fs_dir_entry *de;
452 unsigned int nbucket, nblock;
453 size_t namelen = name->len;
454 struct page *dentry_page = NULL;
455 struct f2fs_dentry_block *dentry_blk = NULL;
456 int slots = GET_DENTRY_SLOTS(namelen);
461 dentry_hash = f2fs_dentry_hash(name);
463 current_depth = F2FS_I(dir)->i_current_depth;
464 if (F2FS_I(dir)->chash == dentry_hash) {
465 level = F2FS_I(dir)->clevel;
466 F2FS_I(dir)->chash = 0;
470 if (unlikely(current_depth == MAX_DIR_HASH_DEPTH))
473 /* Increase the depth, if required */
474 if (level == current_depth)
477 nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level);
478 nblock = bucket_blocks(level);
480 bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level,
481 (le32_to_cpu(dentry_hash) % nbucket));
483 for (block = bidx; block <= (bidx + nblock - 1); block++) {
484 dentry_page = get_new_data_page(dir, NULL, block, true);
485 if (IS_ERR(dentry_page))
486 return PTR_ERR(dentry_page);
488 dentry_blk = kmap(dentry_page);
489 bit_pos = room_for_filename(dentry_blk, slots);
490 if (bit_pos < NR_DENTRY_IN_BLOCK)
494 f2fs_put_page(dentry_page, 1);
497 /* Move to next level to find the empty slot for new dentry */
501 f2fs_wait_on_page_writeback(dentry_page, DATA);
503 down_write(&F2FS_I(inode)->i_sem);
504 page = init_inode_metadata(inode, dir, name);
509 de = &dentry_blk->dentry[bit_pos];
510 de->hash_code = dentry_hash;
511 de->name_len = cpu_to_le16(namelen);
512 memcpy(dentry_blk->filename[bit_pos], name->name, name->len);
513 de->ino = cpu_to_le32(inode->i_ino);
514 set_de_type(de, inode);
515 for (i = 0; i < slots; i++)
516 test_and_set_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap);
517 set_page_dirty(dentry_page);
519 /* we don't need to mark_inode_dirty now */
520 F2FS_I(inode)->i_pino = dir->i_ino;
521 update_inode(inode, page);
522 f2fs_put_page(page, 1);
524 update_parent_metadata(dir, inode, current_depth);
526 up_write(&F2FS_I(inode)->i_sem);
528 if (is_inode_flag_set(F2FS_I(dir), FI_UPDATE_DIR)) {
529 update_inode_page(dir);
530 clear_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
533 f2fs_put_page(dentry_page, 1);
537 int f2fs_do_tmpfile(struct inode *inode, struct inode *dir)
542 down_write(&F2FS_I(inode)->i_sem);
543 page = init_inode_metadata(inode, dir, NULL);
548 /* we don't need to mark_inode_dirty now */
549 update_inode(inode, page);
550 f2fs_put_page(page, 1);
552 clear_inode_flag(F2FS_I(inode), FI_NEW_INODE);
554 up_write(&F2FS_I(inode)->i_sem);
559 * It only removes the dentry from the dentry page,corresponding name
560 * entry in name page does not need to be touched during deletion.
562 void f2fs_delete_entry(struct f2fs_dir_entry *dentry, struct page *page,
565 struct f2fs_dentry_block *dentry_blk;
566 unsigned int bit_pos;
567 struct address_space *mapping = page->mapping;
568 struct inode *dir = mapping->host;
569 int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len));
573 f2fs_wait_on_page_writeback(page, DATA);
575 dentry_blk = page_address(page);
576 bit_pos = dentry - dentry_blk->dentry;
577 for (i = 0; i < slots; i++)
578 test_and_clear_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap);
580 /* Let's check and deallocate this dentry page */
581 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
584 kunmap(page); /* kunmap - pair of f2fs_find_entry */
585 set_page_dirty(page);
587 dir->i_ctime = dir->i_mtime = CURRENT_TIME;
590 struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
592 down_write(&F2FS_I(inode)->i_sem);
594 if (S_ISDIR(inode->i_mode)) {
596 update_inode_page(dir);
598 inode->i_ctime = CURRENT_TIME;
600 if (S_ISDIR(inode->i_mode)) {
602 i_size_write(inode, 0);
604 up_write(&F2FS_I(inode)->i_sem);
605 update_inode_page(inode);
607 if (inode->i_nlink == 0)
608 add_orphan_inode(sbi, inode->i_ino);
610 release_orphan_inode(sbi);
613 if (bit_pos == NR_DENTRY_IN_BLOCK) {
614 truncate_hole(dir, page->index, page->index + 1);
615 clear_page_dirty_for_io(page);
616 ClearPageUptodate(page);
617 inode_dec_dirty_dents(dir);
619 f2fs_put_page(page, 1);
622 bool f2fs_empty_dir(struct inode *dir)
625 struct page *dentry_page;
626 unsigned int bit_pos;
627 struct f2fs_dentry_block *dentry_blk;
628 unsigned long nblock = dir_blocks(dir);
630 for (bidx = 0; bidx < nblock; bidx++) {
631 dentry_page = get_lock_data_page(dir, bidx);
632 if (IS_ERR(dentry_page)) {
633 if (PTR_ERR(dentry_page) == -ENOENT)
640 dentry_blk = kmap_atomic(dentry_page);
645 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
648 kunmap_atomic(dentry_blk);
650 f2fs_put_page(dentry_page, 1);
652 if (bit_pos < NR_DENTRY_IN_BLOCK)
658 static int f2fs_readdir(struct file *file, struct dir_context *ctx)
660 struct inode *inode = file_inode(file);
661 unsigned long npages = dir_blocks(inode);
662 unsigned int bit_pos = 0;
663 struct f2fs_dentry_block *dentry_blk = NULL;
664 struct f2fs_dir_entry *de = NULL;
665 struct page *dentry_page = NULL;
666 struct file_ra_state *ra = &file->f_ra;
667 unsigned int n = ((unsigned long)ctx->pos / NR_DENTRY_IN_BLOCK);
668 unsigned char d_type = DT_UNKNOWN;
670 bit_pos = ((unsigned long)ctx->pos % NR_DENTRY_IN_BLOCK);
672 /* readahead for multi pages of dir */
673 if (npages - n > 1 && !ra_has_index(ra, n))
674 page_cache_sync_readahead(inode->i_mapping, ra, file, n,
675 min(npages - n, (pgoff_t)MAX_DIR_RA_PAGES));
677 for (; n < npages; n++) {
678 dentry_page = get_lock_data_page(inode, n);
679 if (IS_ERR(dentry_page))
682 dentry_blk = kmap(dentry_page);
683 while (bit_pos < NR_DENTRY_IN_BLOCK) {
684 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
687 if (bit_pos >= NR_DENTRY_IN_BLOCK)
690 de = &dentry_blk->dentry[bit_pos];
691 if (de->file_type < F2FS_FT_MAX)
692 d_type = f2fs_filetype_table[de->file_type];
696 dentry_blk->filename[bit_pos],
697 le16_to_cpu(de->name_len),
698 le32_to_cpu(de->ino), d_type))
701 bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
702 ctx->pos = n * NR_DENTRY_IN_BLOCK + bit_pos;
705 ctx->pos = (n + 1) * NR_DENTRY_IN_BLOCK;
707 f2fs_put_page(dentry_page, 1);
711 if (dentry_page && !IS_ERR(dentry_page)) {
713 f2fs_put_page(dentry_page, 1);
719 const struct file_operations f2fs_dir_operations = {
720 .llseek = generic_file_llseek,
721 .read = generic_read_dir,
722 .iterate = f2fs_readdir,
723 .fsync = f2fs_sync_file,
724 .unlocked_ioctl = f2fs_ioctl,