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>
17 static unsigned long dir_blocks(struct inode *inode)
19 return ((unsigned long long) (i_size_read(inode) + PAGE_CACHE_SIZE - 1))
23 static unsigned int dir_buckets(unsigned int level)
25 if (level < MAX_DIR_HASH_DEPTH / 2)
28 return 1 << ((MAX_DIR_HASH_DEPTH / 2) - 1);
31 static unsigned int bucket_blocks(unsigned int level)
33 if (level < MAX_DIR_HASH_DEPTH / 2)
39 static unsigned char f2fs_filetype_table[F2FS_FT_MAX] = {
40 [F2FS_FT_UNKNOWN] = DT_UNKNOWN,
41 [F2FS_FT_REG_FILE] = DT_REG,
42 [F2FS_FT_DIR] = DT_DIR,
43 [F2FS_FT_CHRDEV] = DT_CHR,
44 [F2FS_FT_BLKDEV] = DT_BLK,
45 [F2FS_FT_FIFO] = DT_FIFO,
46 [F2FS_FT_SOCK] = DT_SOCK,
47 [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, struct inode *inode)
63 umode_t mode = inode->i_mode;
64 de->file_type = f2fs_type_by_mode[(mode & S_IFMT) >> S_SHIFT];
67 static unsigned long dir_block_index(unsigned int level, unsigned int idx)
70 unsigned long bidx = 0;
72 for (i = 0; i < level; i++)
73 bidx += dir_buckets(i) * bucket_blocks(i);
74 bidx += idx * bucket_blocks(level);
78 static bool early_match_name(const char *name, size_t namelen,
79 f2fs_hash_t namehash, struct f2fs_dir_entry *de)
81 if (le16_to_cpu(de->name_len) != namelen)
84 if (de->hash_code != namehash)
90 static struct f2fs_dir_entry *find_in_block(struct page *dentry_page,
91 const char *name, size_t namelen, int *max_slots,
92 f2fs_hash_t namehash, struct page **res_page)
94 struct f2fs_dir_entry *de;
95 unsigned long bit_pos, end_pos, next_pos;
96 struct f2fs_dentry_block *dentry_blk = kmap(dentry_page);
99 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
100 NR_DENTRY_IN_BLOCK, 0);
101 while (bit_pos < NR_DENTRY_IN_BLOCK) {
102 de = &dentry_blk->dentry[bit_pos];
103 slots = GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
105 if (early_match_name(name, namelen, namehash, de)) {
106 if (!memcmp(dentry_blk->filename[bit_pos],
108 *res_page = dentry_page;
112 next_pos = bit_pos + slots;
113 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
114 NR_DENTRY_IN_BLOCK, next_pos);
115 if (bit_pos >= NR_DENTRY_IN_BLOCK)
116 end_pos = NR_DENTRY_IN_BLOCK;
119 if (*max_slots < end_pos - next_pos)
120 *max_slots = end_pos - next_pos;
129 static struct f2fs_dir_entry *find_in_level(struct inode *dir,
130 unsigned int level, const char *name, size_t namelen,
131 f2fs_hash_t namehash, struct page **res_page)
133 int s = GET_DENTRY_SLOTS(namelen);
134 unsigned int nbucket, nblock;
135 unsigned int bidx, end_block;
136 struct page *dentry_page;
137 struct f2fs_dir_entry *de = NULL;
141 BUG_ON(level > MAX_DIR_HASH_DEPTH);
143 nbucket = dir_buckets(level);
144 nblock = bucket_blocks(level);
146 bidx = dir_block_index(level, le32_to_cpu(namehash) % nbucket);
147 end_block = bidx + nblock;
149 for (; bidx < end_block; bidx++) {
150 /* no need to allocate new dentry pages to all the indices */
151 dentry_page = find_data_page(dir, bidx, true);
152 if (IS_ERR(dentry_page)) {
157 de = find_in_block(dentry_page, name, namelen,
158 &max_slots, namehash, res_page);
164 f2fs_put_page(dentry_page, 0);
167 if (!de && room && F2FS_I(dir)->chash != namehash) {
168 F2FS_I(dir)->chash = namehash;
169 F2FS_I(dir)->clevel = level;
176 * Find an entry in the specified directory with the wanted name.
177 * It returns the page where the entry was found (as a parameter - res_page),
178 * and the entry itself. Page is returned mapped and unlocked.
179 * Entry is guaranteed to be valid.
181 struct f2fs_dir_entry *f2fs_find_entry(struct inode *dir,
182 struct qstr *child, struct page **res_page)
184 const char *name = child->name;
185 size_t namelen = child->len;
186 unsigned long npages = dir_blocks(dir);
187 struct f2fs_dir_entry *de = NULL;
188 f2fs_hash_t name_hash;
189 unsigned int max_depth;
192 if (namelen > F2FS_NAME_LEN)
200 name_hash = f2fs_dentry_hash(name, namelen);
201 max_depth = F2FS_I(dir)->i_current_depth;
203 for (level = 0; level < max_depth; level++) {
204 de = find_in_level(dir, level, name,
205 namelen, name_hash, res_page);
209 if (!de && F2FS_I(dir)->chash != name_hash) {
210 F2FS_I(dir)->chash = name_hash;
211 F2FS_I(dir)->clevel = level - 1;
216 struct f2fs_dir_entry *f2fs_parent_dir(struct inode *dir, struct page **p)
219 struct f2fs_dir_entry *de;
220 struct f2fs_dentry_block *dentry_blk;
222 page = get_lock_data_page(dir, 0);
226 dentry_blk = kmap(page);
227 de = &dentry_blk->dentry[1];
233 ino_t f2fs_inode_by_name(struct inode *dir, struct qstr *qstr)
236 struct f2fs_dir_entry *de;
239 de = f2fs_find_entry(dir, qstr, &page);
241 res = le32_to_cpu(de->ino);
243 f2fs_put_page(page, 0);
249 void f2fs_set_link(struct inode *dir, struct f2fs_dir_entry *de,
250 struct page *page, struct inode *inode)
253 wait_on_page_writeback(page);
254 de->ino = cpu_to_le32(inode->i_ino);
255 set_de_type(de, inode);
257 set_page_dirty(page);
258 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
259 mark_inode_dirty(dir);
261 /* update parent inode number before releasing dentry page */
262 F2FS_I(inode)->i_pino = dir->i_ino;
264 f2fs_put_page(page, 1);
267 static void init_dent_inode(const struct qstr *name, struct page *ipage)
269 struct f2fs_node *rn;
271 /* copy name info. to this inode page */
272 rn = (struct f2fs_node *)page_address(ipage);
273 rn->i.i_namelen = cpu_to_le32(name->len);
274 memcpy(rn->i.i_name, name->name, name->len);
275 set_page_dirty(ipage);
278 static int make_empty_dir(struct inode *inode,
279 struct inode *parent, struct page *page)
281 struct page *dentry_page;
282 struct f2fs_dentry_block *dentry_blk;
283 struct f2fs_dir_entry *de;
286 dentry_page = get_new_data_page(inode, page, 0, true);
287 if (IS_ERR(dentry_page))
288 return PTR_ERR(dentry_page);
290 kaddr = kmap_atomic(dentry_page);
291 dentry_blk = (struct f2fs_dentry_block *)kaddr;
293 de = &dentry_blk->dentry[0];
294 de->name_len = cpu_to_le16(1);
296 de->ino = cpu_to_le32(inode->i_ino);
297 memcpy(dentry_blk->filename[0], ".", 1);
298 set_de_type(de, inode);
300 de = &dentry_blk->dentry[1];
302 de->name_len = cpu_to_le16(2);
303 de->ino = cpu_to_le32(parent->i_ino);
304 memcpy(dentry_blk->filename[1], "..", 2);
305 set_de_type(de, inode);
307 test_and_set_bit_le(0, &dentry_blk->dentry_bitmap);
308 test_and_set_bit_le(1, &dentry_blk->dentry_bitmap);
309 kunmap_atomic(kaddr);
311 set_page_dirty(dentry_page);
312 f2fs_put_page(dentry_page, 1);
316 static struct page *init_inode_metadata(struct inode *inode,
317 struct inode *dir, const struct qstr *name)
322 if (is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) {
323 page = new_inode_page(inode, name);
327 if (S_ISDIR(inode->i_mode)) {
328 err = make_empty_dir(inode, dir, page);
333 err = f2fs_init_acl(inode, dir);
337 wait_on_page_writeback(page);
339 page = get_node_page(F2FS_SB(dir->i_sb), inode->i_ino);
343 wait_on_page_writeback(page);
344 set_cold_node(inode, page);
347 init_dent_inode(name, page);
349 if (is_inode_flag_set(F2FS_I(inode), FI_INC_LINK))
354 f2fs_put_page(page, 1);
355 remove_inode_page(inode);
359 static void update_parent_metadata(struct inode *dir, struct inode *inode,
360 unsigned int current_depth)
362 bool need_dir_update = false;
364 if (is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) {
365 if (S_ISDIR(inode->i_mode)) {
367 need_dir_update = true;
369 clear_inode_flag(F2FS_I(inode), FI_NEW_INODE);
371 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
372 if (F2FS_I(dir)->i_current_depth != current_depth) {
373 F2FS_I(dir)->i_current_depth = current_depth;
374 need_dir_update = true;
378 update_inode_page(dir);
380 mark_inode_dirty(dir);
382 if (is_inode_flag_set(F2FS_I(inode), FI_INC_LINK))
383 clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
386 static int room_for_filename(struct f2fs_dentry_block *dentry_blk, int slots)
389 int zero_start, zero_end;
391 zero_start = find_next_zero_bit_le(&dentry_blk->dentry_bitmap,
394 if (zero_start >= NR_DENTRY_IN_BLOCK)
395 return NR_DENTRY_IN_BLOCK;
397 zero_end = find_next_bit_le(&dentry_blk->dentry_bitmap,
400 if (zero_end - zero_start >= slots)
403 bit_start = zero_end + 1;
405 if (zero_end + 1 >= NR_DENTRY_IN_BLOCK)
406 return NR_DENTRY_IN_BLOCK;
411 * Caller should grab and release a mutex by calling mutex_lock_op() and
414 int __f2fs_add_link(struct inode *dir, const struct qstr *name, struct inode *inode)
416 unsigned int bit_pos;
418 unsigned int current_depth;
419 unsigned long bidx, block;
420 f2fs_hash_t dentry_hash;
421 struct f2fs_dir_entry *de;
422 unsigned int nbucket, nblock;
423 size_t namelen = name->len;
424 struct page *dentry_page = NULL;
425 struct f2fs_dentry_block *dentry_blk = NULL;
426 int slots = GET_DENTRY_SLOTS(namelen);
431 dentry_hash = f2fs_dentry_hash(name->name, name->len);
433 current_depth = F2FS_I(dir)->i_current_depth;
434 if (F2FS_I(dir)->chash == dentry_hash) {
435 level = F2FS_I(dir)->clevel;
436 F2FS_I(dir)->chash = 0;
440 if (current_depth == MAX_DIR_HASH_DEPTH)
443 /* Increase the depth, if required */
444 if (level == current_depth)
447 nbucket = dir_buckets(level);
448 nblock = bucket_blocks(level);
450 bidx = dir_block_index(level, (le32_to_cpu(dentry_hash) % nbucket));
452 for (block = bidx; block <= (bidx + nblock - 1); block++) {
453 dentry_page = get_new_data_page(dir, NULL, block, true);
454 if (IS_ERR(dentry_page))
455 return PTR_ERR(dentry_page);
457 dentry_blk = kmap(dentry_page);
458 bit_pos = room_for_filename(dentry_blk, slots);
459 if (bit_pos < NR_DENTRY_IN_BLOCK)
463 f2fs_put_page(dentry_page, 1);
466 /* Move to next level to find the empty slot for new dentry */
470 wait_on_page_writeback(dentry_page);
472 page = init_inode_metadata(inode, dir, name);
477 de = &dentry_blk->dentry[bit_pos];
478 de->hash_code = dentry_hash;
479 de->name_len = cpu_to_le16(namelen);
480 memcpy(dentry_blk->filename[bit_pos], name->name, name->len);
481 de->ino = cpu_to_le32(inode->i_ino);
482 set_de_type(de, inode);
483 for (i = 0; i < slots; i++)
484 test_and_set_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap);
485 set_page_dirty(dentry_page);
487 /* we don't need to mark_inode_dirty now */
488 F2FS_I(inode)->i_pino = dir->i_ino;
489 update_inode(inode, page);
490 f2fs_put_page(page, 1);
492 update_parent_metadata(dir, inode, current_depth);
495 f2fs_put_page(dentry_page, 1);
500 * It only removes the dentry from the dentry page,corresponding name
501 * entry in name page does not need to be touched during deletion.
503 void f2fs_delete_entry(struct f2fs_dir_entry *dentry, struct page *page,
506 struct f2fs_dentry_block *dentry_blk;
507 unsigned int bit_pos;
508 struct address_space *mapping = page->mapping;
509 struct inode *dir = mapping->host;
510 struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
511 int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len));
512 void *kaddr = page_address(page);
516 wait_on_page_writeback(page);
518 dentry_blk = (struct f2fs_dentry_block *)kaddr;
519 bit_pos = dentry - (struct f2fs_dir_entry *)dentry_blk->dentry;
520 for (i = 0; i < slots; i++)
521 test_and_clear_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap);
523 /* Let's check and deallocate this dentry page */
524 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
527 kunmap(page); /* kunmap - pair of f2fs_find_entry */
528 set_page_dirty(page);
530 dir->i_ctime = dir->i_mtime = CURRENT_TIME;
532 if (inode && S_ISDIR(inode->i_mode)) {
534 update_inode_page(dir);
536 mark_inode_dirty(dir);
540 inode->i_ctime = CURRENT_TIME;
542 if (S_ISDIR(inode->i_mode)) {
544 i_size_write(inode, 0);
546 update_inode_page(inode);
548 if (inode->i_nlink == 0)
549 add_orphan_inode(sbi, inode->i_ino);
552 if (bit_pos == NR_DENTRY_IN_BLOCK) {
553 truncate_hole(dir, page->index, page->index + 1);
554 clear_page_dirty_for_io(page);
555 ClearPageUptodate(page);
556 dec_page_count(sbi, F2FS_DIRTY_DENTS);
557 inode_dec_dirty_dents(dir);
559 f2fs_put_page(page, 1);
562 bool f2fs_empty_dir(struct inode *dir)
565 struct page *dentry_page;
566 unsigned int bit_pos;
567 struct f2fs_dentry_block *dentry_blk;
568 unsigned long nblock = dir_blocks(dir);
570 for (bidx = 0; bidx < nblock; bidx++) {
572 dentry_page = get_lock_data_page(dir, bidx);
573 if (IS_ERR(dentry_page)) {
574 if (PTR_ERR(dentry_page) == -ENOENT)
580 kaddr = kmap_atomic(dentry_page);
581 dentry_blk = (struct f2fs_dentry_block *)kaddr;
586 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
589 kunmap_atomic(kaddr);
591 f2fs_put_page(dentry_page, 1);
593 if (bit_pos < NR_DENTRY_IN_BLOCK)
599 static int f2fs_readdir(struct file *file, void *dirent, filldir_t filldir)
601 unsigned long pos = file->f_pos;
602 struct inode *inode = file_inode(file);
603 unsigned long npages = dir_blocks(inode);
604 unsigned char *types = NULL;
605 unsigned int bit_pos = 0, start_bit_pos = 0;
607 struct f2fs_dentry_block *dentry_blk = NULL;
608 struct f2fs_dir_entry *de = NULL;
609 struct page *dentry_page = NULL;
611 unsigned char d_type = DT_UNKNOWN;
614 types = f2fs_filetype_table;
615 bit_pos = (pos % NR_DENTRY_IN_BLOCK);
616 n = (pos / NR_DENTRY_IN_BLOCK);
618 for ( ; n < npages; n++) {
619 dentry_page = get_lock_data_page(inode, n);
620 if (IS_ERR(dentry_page))
623 start_bit_pos = bit_pos;
624 dentry_blk = kmap(dentry_page);
625 while (bit_pos < NR_DENTRY_IN_BLOCK) {
627 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
630 if (bit_pos >= NR_DENTRY_IN_BLOCK)
633 de = &dentry_blk->dentry[bit_pos];
634 if (types && de->file_type < F2FS_FT_MAX)
635 d_type = types[de->file_type];
637 over = filldir(dirent,
638 dentry_blk->filename[bit_pos],
639 le16_to_cpu(de->name_len),
640 (n * NR_DENTRY_IN_BLOCK) + bit_pos,
641 le32_to_cpu(de->ino), d_type);
643 file->f_pos += bit_pos - start_bit_pos;
646 slots = GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
650 file->f_pos = (n + 1) * NR_DENTRY_IN_BLOCK;
652 f2fs_put_page(dentry_page, 1);
656 if (dentry_page && !IS_ERR(dentry_page)) {
658 f2fs_put_page(dentry_page, 1);
664 const struct file_operations f2fs_dir_operations = {
665 .llseek = generic_file_llseek,
666 .read = generic_read_dir,
667 .readdir = f2fs_readdir,
668 .fsync = f2fs_sync_file,
669 .unlocked_ioctl = f2fs_ioctl,