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)
26 if (level < MAX_DIR_HASH_DEPTH / 2)
29 return 1 << ((MAX_DIR_HASH_DEPTH / 2) - 1);
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, unsigned int idx)
71 unsigned long bidx = 0;
73 for (i = 0; i < level; i++)
74 bidx += dir_buckets(i) * bucket_blocks(i);
75 bidx += idx * bucket_blocks(level);
79 static bool early_match_name(const char *name, size_t namelen,
80 f2fs_hash_t namehash, struct f2fs_dir_entry *de)
82 if (le16_to_cpu(de->name_len) != namelen)
85 if (de->hash_code != namehash)
91 static struct f2fs_dir_entry *find_in_block(struct page *dentry_page,
92 const char *name, size_t namelen, int *max_slots,
93 f2fs_hash_t namehash, struct page **res_page)
95 struct f2fs_dir_entry *de;
96 unsigned long bit_pos, end_pos, next_pos;
97 struct f2fs_dentry_block *dentry_blk = kmap(dentry_page);
100 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
101 NR_DENTRY_IN_BLOCK, 0);
102 while (bit_pos < NR_DENTRY_IN_BLOCK) {
103 de = &dentry_blk->dentry[bit_pos];
104 slots = GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
106 if (early_match_name(name, namelen, namehash, de)) {
107 if (!memcmp(dentry_blk->filename[bit_pos],
109 *res_page = dentry_page;
113 next_pos = bit_pos + slots;
114 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
115 NR_DENTRY_IN_BLOCK, next_pos);
116 if (bit_pos >= NR_DENTRY_IN_BLOCK)
117 end_pos = NR_DENTRY_IN_BLOCK;
120 if (*max_slots < end_pos - next_pos)
121 *max_slots = end_pos - next_pos;
130 static struct f2fs_dir_entry *find_in_level(struct inode *dir,
131 unsigned int level, const char *name, size_t namelen,
132 f2fs_hash_t namehash, struct page **res_page)
134 int s = GET_DENTRY_SLOTS(namelen);
135 unsigned int nbucket, nblock;
136 unsigned int bidx, end_block;
137 struct page *dentry_page;
138 struct f2fs_dir_entry *de = NULL;
142 BUG_ON(level > MAX_DIR_HASH_DEPTH);
144 nbucket = dir_buckets(level);
145 nblock = bucket_blocks(level);
147 bidx = dir_block_index(level, le32_to_cpu(namehash) % nbucket);
148 end_block = bidx + nblock;
150 for (; bidx < end_block; bidx++) {
151 /* no need to allocate new dentry pages to all the indices */
152 dentry_page = find_data_page(dir, bidx, true);
153 if (IS_ERR(dentry_page)) {
158 de = find_in_block(dentry_page, name, namelen,
159 &max_slots, namehash, res_page);
165 f2fs_put_page(dentry_page, 0);
168 if (!de && room && F2FS_I(dir)->chash != namehash) {
169 F2FS_I(dir)->chash = namehash;
170 F2FS_I(dir)->clevel = level;
177 * Find an entry in the specified directory with the wanted name.
178 * It returns the page where the entry was found (as a parameter - res_page),
179 * and the entry itself. Page is returned mapped and unlocked.
180 * Entry is guaranteed to be valid.
182 struct f2fs_dir_entry *f2fs_find_entry(struct inode *dir,
183 struct qstr *child, struct page **res_page)
185 const char *name = child->name;
186 size_t namelen = child->len;
187 unsigned long npages = dir_blocks(dir);
188 struct f2fs_dir_entry *de = NULL;
189 f2fs_hash_t name_hash;
190 unsigned int max_depth;
193 if (namelen > F2FS_NAME_LEN)
201 name_hash = f2fs_dentry_hash(name, namelen);
202 max_depth = F2FS_I(dir)->i_current_depth;
204 for (level = 0; level < max_depth; level++) {
205 de = find_in_level(dir, level, name,
206 namelen, 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)
219 struct page *page = NULL;
220 struct f2fs_dir_entry *de = NULL;
221 struct f2fs_dentry_block *dentry_blk = NULL;
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 wait_on_page_writeback(page);
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 /* update parent inode number before releasing dentry page */
263 F2FS_I(inode)->i_pino = dir->i_ino;
265 f2fs_put_page(page, 1);
268 static void init_dent_inode(const struct qstr *name, struct page *ipage)
270 struct f2fs_node *rn;
272 /* copy name info. to this inode page */
273 rn = (struct f2fs_node *)page_address(ipage);
274 rn->i.i_namelen = cpu_to_le32(name->len);
275 memcpy(rn->i.i_name, name->name, name->len);
276 set_page_dirty(ipage);
279 static int make_empty_dir(struct inode *inode,
280 struct inode *parent, struct page *page)
282 struct page *dentry_page;
283 struct f2fs_dentry_block *dentry_blk;
284 struct f2fs_dir_entry *de;
287 dentry_page = get_new_data_page(inode, page, 0, true);
288 if (IS_ERR(dentry_page))
289 return PTR_ERR(dentry_page);
291 kaddr = kmap_atomic(dentry_page);
292 dentry_blk = (struct f2fs_dentry_block *)kaddr;
294 de = &dentry_blk->dentry[0];
295 de->name_len = cpu_to_le16(1);
297 de->ino = cpu_to_le32(inode->i_ino);
298 memcpy(dentry_blk->filename[0], ".", 1);
299 set_de_type(de, inode);
301 de = &dentry_blk->dentry[1];
303 de->name_len = cpu_to_le16(2);
304 de->ino = cpu_to_le32(parent->i_ino);
305 memcpy(dentry_blk->filename[1], "..", 2);
306 set_de_type(de, inode);
308 test_and_set_bit_le(0, &dentry_blk->dentry_bitmap);
309 test_and_set_bit_le(1, &dentry_blk->dentry_bitmap);
310 kunmap_atomic(kaddr);
312 set_page_dirty(dentry_page);
313 f2fs_put_page(dentry_page, 1);
317 static struct page *init_inode_metadata(struct inode *inode,
318 struct inode *dir, const struct qstr *name)
323 if (is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) {
324 page = new_inode_page(inode, name);
328 if (S_ISDIR(inode->i_mode)) {
329 err = make_empty_dir(inode, dir, page);
334 err = f2fs_init_acl(inode, dir);
338 err = f2fs_init_security(inode, dir, name, page);
342 wait_on_page_writeback(page);
344 page = get_node_page(F2FS_SB(dir->i_sb), inode->i_ino);
348 wait_on_page_writeback(page);
349 set_cold_node(inode, page);
352 init_dent_inode(name, page);
354 if (is_inode_flag_set(F2FS_I(inode), FI_INC_LINK))
359 f2fs_put_page(page, 1);
360 remove_inode_page(inode);
364 static void update_parent_metadata(struct inode *dir, struct inode *inode,
365 unsigned int current_depth)
367 bool need_dir_update = false;
369 if (is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) {
370 if (S_ISDIR(inode->i_mode)) {
372 need_dir_update = true;
374 clear_inode_flag(F2FS_I(inode), FI_NEW_INODE);
376 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
377 if (F2FS_I(dir)->i_current_depth != current_depth) {
378 F2FS_I(dir)->i_current_depth = current_depth;
379 need_dir_update = true;
383 update_inode_page(dir);
385 mark_inode_dirty(dir);
387 if (is_inode_flag_set(F2FS_I(inode), FI_INC_LINK))
388 clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
391 static int room_for_filename(struct f2fs_dentry_block *dentry_blk, int slots)
394 int zero_start, zero_end;
396 zero_start = find_next_zero_bit_le(&dentry_blk->dentry_bitmap,
399 if (zero_start >= NR_DENTRY_IN_BLOCK)
400 return NR_DENTRY_IN_BLOCK;
402 zero_end = find_next_bit_le(&dentry_blk->dentry_bitmap,
405 if (zero_end - zero_start >= slots)
408 bit_start = zero_end + 1;
410 if (zero_end + 1 >= NR_DENTRY_IN_BLOCK)
411 return NR_DENTRY_IN_BLOCK;
416 * Caller should grab and release a mutex by calling mutex_lock_op() and
419 int __f2fs_add_link(struct inode *dir, const struct qstr *name, struct inode *inode)
421 unsigned int bit_pos;
423 unsigned int current_depth;
424 unsigned long bidx, block;
425 f2fs_hash_t dentry_hash;
426 struct f2fs_dir_entry *de;
427 unsigned int nbucket, nblock;
428 size_t namelen = name->len;
429 struct page *dentry_page = NULL;
430 struct f2fs_dentry_block *dentry_blk = NULL;
431 int slots = GET_DENTRY_SLOTS(namelen);
436 dentry_hash = f2fs_dentry_hash(name->name, name->len);
438 current_depth = F2FS_I(dir)->i_current_depth;
439 if (F2FS_I(dir)->chash == dentry_hash) {
440 level = F2FS_I(dir)->clevel;
441 F2FS_I(dir)->chash = 0;
445 if (current_depth == MAX_DIR_HASH_DEPTH)
448 /* Increase the depth, if required */
449 if (level == current_depth)
452 nbucket = dir_buckets(level);
453 nblock = bucket_blocks(level);
455 bidx = dir_block_index(level, (le32_to_cpu(dentry_hash) % nbucket));
457 for (block = bidx; block <= (bidx + nblock - 1); block++) {
458 dentry_page = get_new_data_page(dir, NULL, block, true);
459 if (IS_ERR(dentry_page))
460 return PTR_ERR(dentry_page);
462 dentry_blk = kmap(dentry_page);
463 bit_pos = room_for_filename(dentry_blk, slots);
464 if (bit_pos < NR_DENTRY_IN_BLOCK)
468 f2fs_put_page(dentry_page, 1);
471 /* Move to next level to find the empty slot for new dentry */
475 wait_on_page_writeback(dentry_page);
477 page = init_inode_metadata(inode, dir, name);
482 de = &dentry_blk->dentry[bit_pos];
483 de->hash_code = dentry_hash;
484 de->name_len = cpu_to_le16(namelen);
485 memcpy(dentry_blk->filename[bit_pos], name->name, name->len);
486 de->ino = cpu_to_le32(inode->i_ino);
487 set_de_type(de, inode);
488 for (i = 0; i < slots; i++)
489 test_and_set_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap);
490 set_page_dirty(dentry_page);
492 /* we don't need to mark_inode_dirty now */
493 F2FS_I(inode)->i_pino = dir->i_ino;
494 update_inode(inode, page);
495 f2fs_put_page(page, 1);
497 update_parent_metadata(dir, inode, current_depth);
500 f2fs_put_page(dentry_page, 1);
505 * It only removes the dentry from the dentry page,corresponding name
506 * entry in name page does not need to be touched during deletion.
508 void f2fs_delete_entry(struct f2fs_dir_entry *dentry, struct page *page,
511 struct f2fs_dentry_block *dentry_blk;
512 unsigned int bit_pos;
513 struct address_space *mapping = page->mapping;
514 struct inode *dir = mapping->host;
515 struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
516 int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len));
517 void *kaddr = page_address(page);
521 wait_on_page_writeback(page);
523 dentry_blk = (struct f2fs_dentry_block *)kaddr;
524 bit_pos = dentry - (struct f2fs_dir_entry *)dentry_blk->dentry;
525 for (i = 0; i < slots; i++)
526 test_and_clear_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap);
528 /* Let's check and deallocate this dentry page */
529 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
532 kunmap(page); /* kunmap - pair of f2fs_find_entry */
533 set_page_dirty(page);
535 dir->i_ctime = dir->i_mtime = CURRENT_TIME;
537 if (inode && S_ISDIR(inode->i_mode)) {
539 update_inode_page(dir);
541 mark_inode_dirty(dir);
545 inode->i_ctime = CURRENT_TIME;
547 if (S_ISDIR(inode->i_mode)) {
549 i_size_write(inode, 0);
551 update_inode_page(inode);
553 if (inode->i_nlink == 0)
554 add_orphan_inode(sbi, inode->i_ino);
557 if (bit_pos == NR_DENTRY_IN_BLOCK) {
558 truncate_hole(dir, page->index, page->index + 1);
559 clear_page_dirty_for_io(page);
560 ClearPageUptodate(page);
561 dec_page_count(sbi, F2FS_DIRTY_DENTS);
562 inode_dec_dirty_dents(dir);
564 f2fs_put_page(page, 1);
567 bool f2fs_empty_dir(struct inode *dir)
570 struct page *dentry_page;
571 unsigned int bit_pos;
572 struct f2fs_dentry_block *dentry_blk;
573 unsigned long nblock = dir_blocks(dir);
575 for (bidx = 0; bidx < nblock; bidx++) {
577 dentry_page = get_lock_data_page(dir, bidx);
578 if (IS_ERR(dentry_page)) {
579 if (PTR_ERR(dentry_page) == -ENOENT)
585 kaddr = kmap_atomic(dentry_page);
586 dentry_blk = (struct f2fs_dentry_block *)kaddr;
591 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
594 kunmap_atomic(kaddr);
596 f2fs_put_page(dentry_page, 1);
598 if (bit_pos < NR_DENTRY_IN_BLOCK)
604 static int f2fs_readdir(struct file *file, void *dirent, filldir_t filldir)
606 unsigned long pos = file->f_pos;
607 struct inode *inode = file_inode(file);
608 unsigned long npages = dir_blocks(inode);
609 unsigned char *types = NULL;
610 unsigned int bit_pos = 0, start_bit_pos = 0;
612 struct f2fs_dentry_block *dentry_blk = NULL;
613 struct f2fs_dir_entry *de = NULL;
614 struct page *dentry_page = NULL;
616 unsigned char d_type = DT_UNKNOWN;
619 types = f2fs_filetype_table;
620 bit_pos = (pos % NR_DENTRY_IN_BLOCK);
621 n = (pos / NR_DENTRY_IN_BLOCK);
623 for ( ; n < npages; n++) {
624 dentry_page = get_lock_data_page(inode, n);
625 if (IS_ERR(dentry_page))
628 start_bit_pos = bit_pos;
629 dentry_blk = kmap(dentry_page);
630 while (bit_pos < NR_DENTRY_IN_BLOCK) {
632 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
635 if (bit_pos >= NR_DENTRY_IN_BLOCK)
638 de = &dentry_blk->dentry[bit_pos];
639 if (types && de->file_type < F2FS_FT_MAX)
640 d_type = types[de->file_type];
642 over = filldir(dirent,
643 dentry_blk->filename[bit_pos],
644 le16_to_cpu(de->name_len),
645 (n * NR_DENTRY_IN_BLOCK) + bit_pos,
646 le32_to_cpu(de->ino), d_type);
648 file->f_pos += bit_pos - start_bit_pos;
651 slots = GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
655 file->f_pos = (n + 1) * NR_DENTRY_IN_BLOCK;
657 f2fs_put_page(dentry_page, 1);
661 if (dentry_page && !IS_ERR(dentry_page)) {
663 f2fs_put_page(dentry_page, 1);
669 const struct file_operations f2fs_dir_operations = {
670 .llseek = generic_file_llseek,
671 .read = generic_read_dir,
672 .readdir = f2fs_readdir,
673 .fsync = f2fs_sync_file,
674 .unlocked_ioctl = f2fs_ioctl,