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>
16 static unsigned long dir_blocks(struct inode *inode)
18 return ((unsigned long long) (i_size_read(inode) + PAGE_CACHE_SIZE - 1))
22 static unsigned int dir_buckets(unsigned int level)
24 if (level < MAX_DIR_HASH_DEPTH / 2)
27 return 1 << ((MAX_DIR_HASH_DEPTH / 2) - 1);
30 static unsigned int bucket_blocks(unsigned int level)
32 if (level < MAX_DIR_HASH_DEPTH / 2)
38 static unsigned char f2fs_filetype_table[F2FS_FT_MAX] = {
39 [F2FS_FT_UNKNOWN] = DT_UNKNOWN,
40 [F2FS_FT_REG_FILE] = DT_REG,
41 [F2FS_FT_DIR] = DT_DIR,
42 [F2FS_FT_CHRDEV] = DT_CHR,
43 [F2FS_FT_BLKDEV] = DT_BLK,
44 [F2FS_FT_FIFO] = DT_FIFO,
45 [F2FS_FT_SOCK] = DT_SOCK,
46 [F2FS_FT_SYMLINK] = DT_LNK,
50 static unsigned char f2fs_type_by_mode[S_IFMT >> S_SHIFT] = {
51 [S_IFREG >> S_SHIFT] = F2FS_FT_REG_FILE,
52 [S_IFDIR >> S_SHIFT] = F2FS_FT_DIR,
53 [S_IFCHR >> S_SHIFT] = F2FS_FT_CHRDEV,
54 [S_IFBLK >> S_SHIFT] = F2FS_FT_BLKDEV,
55 [S_IFIFO >> S_SHIFT] = F2FS_FT_FIFO,
56 [S_IFSOCK >> S_SHIFT] = F2FS_FT_SOCK,
57 [S_IFLNK >> S_SHIFT] = F2FS_FT_SYMLINK,
60 static void set_de_type(struct f2fs_dir_entry *de, struct inode *inode)
62 mode_t mode = inode->i_mode;
63 de->file_type = f2fs_type_by_mode[(mode & S_IFMT) >> S_SHIFT];
66 static unsigned long dir_block_index(unsigned int level, unsigned int idx)
69 unsigned long bidx = 0;
71 for (i = 0; i < level; i++)
72 bidx += dir_buckets(i) * bucket_blocks(i);
73 bidx += idx * bucket_blocks(level);
77 static bool early_match_name(const char *name, int namelen,
78 f2fs_hash_t namehash, struct f2fs_dir_entry *de)
80 if (le16_to_cpu(de->name_len) != namelen)
83 if (de->hash_code != namehash)
89 static struct f2fs_dir_entry *find_in_block(struct page *dentry_page,
90 const char *name, int namelen, int *max_slots,
91 f2fs_hash_t namehash, struct page **res_page)
93 struct f2fs_dir_entry *de;
94 unsigned long bit_pos, end_pos, next_pos;
95 struct f2fs_dentry_block *dentry_blk = kmap(dentry_page);
98 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
99 NR_DENTRY_IN_BLOCK, 0);
100 while (bit_pos < NR_DENTRY_IN_BLOCK) {
101 de = &dentry_blk->dentry[bit_pos];
102 slots = GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
104 if (early_match_name(name, namelen, namehash, de)) {
105 if (!memcmp(dentry_blk->filename[bit_pos],
107 *res_page = dentry_page;
111 next_pos = bit_pos + slots;
112 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
113 NR_DENTRY_IN_BLOCK, next_pos);
114 if (bit_pos >= NR_DENTRY_IN_BLOCK)
115 end_pos = NR_DENTRY_IN_BLOCK;
118 if (*max_slots < end_pos - next_pos)
119 *max_slots = end_pos - next_pos;
128 static struct f2fs_dir_entry *find_in_level(struct inode *dir,
129 unsigned int level, const char *name, int namelen,
130 f2fs_hash_t namehash, struct page **res_page)
132 int s = GET_DENTRY_SLOTS(namelen);
133 unsigned int nbucket, nblock;
134 unsigned int bidx, end_block;
135 struct page *dentry_page;
136 struct f2fs_dir_entry *de = NULL;
140 BUG_ON(level > MAX_DIR_HASH_DEPTH);
142 nbucket = dir_buckets(level);
143 nblock = bucket_blocks(level);
145 bidx = dir_block_index(level, le32_to_cpu(namehash) % nbucket);
146 end_block = bidx + nblock;
148 for (; bidx < end_block; bidx++) {
149 /* no need to allocate new dentry pages to all the indices */
150 dentry_page = find_data_page(dir, bidx);
151 if (IS_ERR(dentry_page)) {
156 de = find_in_block(dentry_page, name, namelen,
157 &max_slots, namehash, res_page);
163 f2fs_put_page(dentry_page, 0);
166 if (!de && room && F2FS_I(dir)->chash != namehash) {
167 F2FS_I(dir)->chash = namehash;
168 F2FS_I(dir)->clevel = level;
175 * Find an entry in the specified directory with the wanted name.
176 * It returns the page where the entry was found (as a parameter - res_page),
177 * and the entry itself. Page is returned mapped and unlocked.
178 * Entry is guaranteed to be valid.
180 struct f2fs_dir_entry *f2fs_find_entry(struct inode *dir,
181 struct qstr *child, struct page **res_page)
183 const char *name = child->name;
184 int namelen = child->len;
185 unsigned long npages = dir_blocks(dir);
186 struct f2fs_dir_entry *de = NULL;
187 f2fs_hash_t name_hash;
188 unsigned int max_depth;
196 name_hash = f2fs_dentry_hash(name, namelen);
197 max_depth = F2FS_I(dir)->i_current_depth;
199 for (level = 0; level < max_depth; level++) {
200 de = find_in_level(dir, level, name,
201 namelen, name_hash, res_page);
205 if (!de && F2FS_I(dir)->chash != name_hash) {
206 F2FS_I(dir)->chash = name_hash;
207 F2FS_I(dir)->clevel = level - 1;
212 struct f2fs_dir_entry *f2fs_parent_dir(struct inode *dir, struct page **p)
214 struct page *page = NULL;
215 struct f2fs_dir_entry *de = NULL;
216 struct f2fs_dentry_block *dentry_blk = NULL;
218 page = get_lock_data_page(dir, 0);
222 dentry_blk = kmap(page);
223 de = &dentry_blk->dentry[1];
229 ino_t f2fs_inode_by_name(struct inode *dir, struct qstr *qstr)
232 struct f2fs_dir_entry *de;
235 de = f2fs_find_entry(dir, qstr, &page);
237 res = le32_to_cpu(de->ino);
239 f2fs_put_page(page, 0);
245 void f2fs_set_link(struct inode *dir, struct f2fs_dir_entry *de,
246 struct page *page, struct inode *inode)
248 struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
250 mutex_lock_op(sbi, DENTRY_OPS);
252 wait_on_page_writeback(page);
253 de->ino = cpu_to_le32(inode->i_ino);
254 set_de_type(de, inode);
256 set_page_dirty(page);
257 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
258 mark_inode_dirty(dir);
259 f2fs_put_page(page, 1);
260 mutex_unlock_op(sbi, DENTRY_OPS);
263 void init_dent_inode(struct dentry *dentry, struct page *ipage)
265 struct inode *dir = dentry->d_parent->d_inode;
266 struct f2fs_node *rn;
271 wait_on_page_writeback(ipage);
273 /* copy dentry info. to this inode page */
274 rn = (struct f2fs_node *)page_address(ipage);
275 rn->i.i_pino = cpu_to_le32(dir->i_ino);
276 rn->i.i_namelen = cpu_to_le32(dentry->d_name.len);
277 memcpy(rn->i.i_name, dentry->d_name.name, dentry->d_name.len);
278 set_page_dirty(ipage);
281 static int init_inode_metadata(struct inode *inode, struct dentry *dentry)
283 struct inode *dir = dentry->d_parent->d_inode;
285 if (is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) {
287 err = new_inode_page(inode, dentry);
291 if (S_ISDIR(inode->i_mode)) {
292 err = f2fs_make_empty(inode, dir);
294 remove_inode_page(inode);
299 err = f2fs_init_acl(inode, dir);
301 remove_inode_page(inode);
306 ipage = get_node_page(F2FS_SB(dir->i_sb), inode->i_ino);
308 return PTR_ERR(ipage);
309 init_dent_inode(dentry, ipage);
310 f2fs_put_page(ipage, 1);
312 if (is_inode_flag_set(F2FS_I(inode), FI_INC_LINK)) {
314 f2fs_write_inode(inode, NULL);
319 static void update_parent_metadata(struct inode *dir, struct inode *inode,
320 unsigned int current_depth)
322 bool need_dir_update = false;
324 if (is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) {
325 if (S_ISDIR(inode->i_mode)) {
327 need_dir_update = true;
329 clear_inode_flag(F2FS_I(inode), FI_NEW_INODE);
331 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
332 if (F2FS_I(dir)->i_current_depth != current_depth) {
333 F2FS_I(dir)->i_current_depth = current_depth;
334 need_dir_update = true;
338 f2fs_write_inode(dir, NULL);
340 mark_inode_dirty(dir);
342 if (is_inode_flag_set(F2FS_I(inode), FI_INC_LINK))
343 clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
346 static int room_for_filename(struct f2fs_dentry_block *dentry_blk, int slots)
349 int zero_start, zero_end;
351 zero_start = find_next_zero_bit_le(&dentry_blk->dentry_bitmap,
354 if (zero_start >= NR_DENTRY_IN_BLOCK)
355 return NR_DENTRY_IN_BLOCK;
357 zero_end = find_next_bit_le(&dentry_blk->dentry_bitmap,
360 if (zero_end - zero_start >= slots)
363 bit_start = zero_end + 1;
365 if (zero_end + 1 >= NR_DENTRY_IN_BLOCK)
366 return NR_DENTRY_IN_BLOCK;
370 int f2fs_add_link(struct dentry *dentry, struct inode *inode)
372 unsigned int bit_pos;
374 unsigned int current_depth;
375 unsigned long bidx, block;
376 f2fs_hash_t dentry_hash;
377 struct f2fs_dir_entry *de;
378 unsigned int nbucket, nblock;
379 struct inode *dir = dentry->d_parent->d_inode;
380 struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
381 const char *name = dentry->d_name.name;
382 int namelen = dentry->d_name.len;
383 struct page *dentry_page = NULL;
384 struct f2fs_dentry_block *dentry_blk = NULL;
385 int slots = GET_DENTRY_SLOTS(namelen);
389 dentry_hash = f2fs_dentry_hash(name, dentry->d_name.len);
391 current_depth = F2FS_I(dir)->i_current_depth;
392 if (F2FS_I(dir)->chash == dentry_hash) {
393 level = F2FS_I(dir)->clevel;
394 F2FS_I(dir)->chash = 0;
398 if (current_depth == MAX_DIR_HASH_DEPTH)
401 /* Increase the depth, if required */
402 if (level == current_depth)
405 nbucket = dir_buckets(level);
406 nblock = bucket_blocks(level);
408 bidx = dir_block_index(level, (le32_to_cpu(dentry_hash) % nbucket));
410 for (block = bidx; block <= (bidx + nblock - 1); block++) {
411 mutex_lock_op(sbi, DENTRY_OPS);
412 dentry_page = get_new_data_page(dir, block, true);
413 if (IS_ERR(dentry_page)) {
414 mutex_unlock_op(sbi, DENTRY_OPS);
415 return PTR_ERR(dentry_page);
418 dentry_blk = kmap(dentry_page);
419 bit_pos = room_for_filename(dentry_blk, slots);
420 if (bit_pos < NR_DENTRY_IN_BLOCK)
424 f2fs_put_page(dentry_page, 1);
425 mutex_unlock_op(sbi, DENTRY_OPS);
428 /* Move to next level to find the empty slot for new dentry */
432 err = init_inode_metadata(inode, dentry);
436 wait_on_page_writeback(dentry_page);
438 de = &dentry_blk->dentry[bit_pos];
439 de->hash_code = dentry_hash;
440 de->name_len = cpu_to_le16(namelen);
441 memcpy(dentry_blk->filename[bit_pos], name, namelen);
442 de->ino = cpu_to_le32(inode->i_ino);
443 set_de_type(de, inode);
444 for (i = 0; i < slots; i++)
445 test_and_set_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap);
446 set_page_dirty(dentry_page);
447 update_parent_metadata(dir, inode, current_depth);
450 f2fs_put_page(dentry_page, 1);
451 mutex_unlock_op(sbi, DENTRY_OPS);
456 * It only removes the dentry from the dentry page,corresponding name
457 * entry in name page does not need to be touched during deletion.
459 void f2fs_delete_entry(struct f2fs_dir_entry *dentry, struct page *page,
462 struct f2fs_dentry_block *dentry_blk;
463 unsigned int bit_pos;
464 struct address_space *mapping = page->mapping;
465 struct inode *dir = mapping->host;
466 struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
467 int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len));
468 void *kaddr = page_address(page);
471 mutex_lock_op(sbi, DENTRY_OPS);
474 wait_on_page_writeback(page);
476 dentry_blk = (struct f2fs_dentry_block *)kaddr;
477 bit_pos = dentry - (struct f2fs_dir_entry *)dentry_blk->dentry;
478 for (i = 0; i < slots; i++)
479 test_and_clear_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap);
481 /* Let's check and deallocate this dentry page */
482 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
485 kunmap(page); /* kunmap - pair of f2fs_find_entry */
486 set_page_dirty(page);
488 dir->i_ctime = dir->i_mtime = CURRENT_TIME;
490 if (inode && S_ISDIR(inode->i_mode)) {
492 f2fs_write_inode(dir, NULL);
494 mark_inode_dirty(dir);
498 inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME;
500 if (S_ISDIR(inode->i_mode)) {
502 i_size_write(inode, 0);
504 f2fs_write_inode(inode, NULL);
505 if (inode->i_nlink == 0)
506 add_orphan_inode(sbi, inode->i_ino);
509 if (bit_pos == NR_DENTRY_IN_BLOCK) {
510 truncate_hole(dir, page->index, page->index + 1);
511 clear_page_dirty_for_io(page);
512 ClearPageUptodate(page);
513 dec_page_count(sbi, F2FS_DIRTY_DENTS);
514 inode_dec_dirty_dents(dir);
516 f2fs_put_page(page, 1);
518 mutex_unlock_op(sbi, DENTRY_OPS);
521 int f2fs_make_empty(struct inode *inode, struct inode *parent)
523 struct page *dentry_page;
524 struct f2fs_dentry_block *dentry_blk;
525 struct f2fs_dir_entry *de;
528 dentry_page = get_new_data_page(inode, 0, true);
529 if (IS_ERR(dentry_page))
530 return PTR_ERR(dentry_page);
532 kaddr = kmap_atomic(dentry_page);
533 dentry_blk = (struct f2fs_dentry_block *)kaddr;
535 de = &dentry_blk->dentry[0];
536 de->name_len = cpu_to_le16(1);
538 de->ino = cpu_to_le32(inode->i_ino);
539 memcpy(dentry_blk->filename[0], ".", 1);
540 set_de_type(de, inode);
542 de = &dentry_blk->dentry[1];
544 de->name_len = cpu_to_le16(2);
545 de->ino = cpu_to_le32(parent->i_ino);
546 memcpy(dentry_blk->filename[1], "..", 2);
547 set_de_type(de, inode);
549 test_and_set_bit_le(0, &dentry_blk->dentry_bitmap);
550 test_and_set_bit_le(1, &dentry_blk->dentry_bitmap);
551 kunmap_atomic(kaddr);
553 set_page_dirty(dentry_page);
554 f2fs_put_page(dentry_page, 1);
558 bool f2fs_empty_dir(struct inode *dir)
561 struct page *dentry_page;
562 unsigned int bit_pos;
563 struct f2fs_dentry_block *dentry_blk;
564 unsigned long nblock = dir_blocks(dir);
566 for (bidx = 0; bidx < nblock; bidx++) {
568 dentry_page = get_lock_data_page(dir, bidx);
569 if (IS_ERR(dentry_page)) {
570 if (PTR_ERR(dentry_page) == -ENOENT)
576 kaddr = kmap_atomic(dentry_page);
577 dentry_blk = (struct f2fs_dentry_block *)kaddr;
582 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
585 kunmap_atomic(kaddr);
587 f2fs_put_page(dentry_page, 1);
589 if (bit_pos < NR_DENTRY_IN_BLOCK)
595 static int f2fs_readdir(struct file *file, void *dirent, filldir_t filldir)
597 unsigned long pos = file->f_pos;
598 struct inode *inode = file->f_dentry->d_inode;
599 unsigned long npages = dir_blocks(inode);
600 unsigned char *types = NULL;
601 unsigned int bit_pos = 0, start_bit_pos = 0;
603 struct f2fs_dentry_block *dentry_blk = NULL;
604 struct f2fs_dir_entry *de = NULL;
605 struct page *dentry_page = NULL;
607 unsigned char d_type = DT_UNKNOWN;
610 types = f2fs_filetype_table;
611 bit_pos = (pos % NR_DENTRY_IN_BLOCK);
612 n = (pos / NR_DENTRY_IN_BLOCK);
614 for ( ; n < npages; n++) {
615 dentry_page = get_lock_data_page(inode, n);
616 if (IS_ERR(dentry_page))
619 start_bit_pos = bit_pos;
620 dentry_blk = kmap(dentry_page);
621 while (bit_pos < NR_DENTRY_IN_BLOCK) {
623 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
626 if (bit_pos >= NR_DENTRY_IN_BLOCK)
629 de = &dentry_blk->dentry[bit_pos];
630 if (types && de->file_type < F2FS_FT_MAX)
631 d_type = types[de->file_type];
633 over = filldir(dirent,
634 dentry_blk->filename[bit_pos],
635 le16_to_cpu(de->name_len),
636 (n * NR_DENTRY_IN_BLOCK) + bit_pos,
637 le32_to_cpu(de->ino), d_type);
639 file->f_pos += bit_pos - start_bit_pos;
642 slots = GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
646 file->f_pos = (n + 1) * NR_DENTRY_IN_BLOCK;
648 f2fs_put_page(dentry_page, 1);
652 if (dentry_page && !IS_ERR(dentry_page)) {
654 f2fs_put_page(dentry_page, 1);
660 const struct file_operations f2fs_dir_operations = {
661 .llseek = generic_file_llseek,
662 .read = generic_read_dir,
663 .readdir = f2fs_readdir,
664 .fsync = f2fs_sync_file,
665 .unlocked_ioctl = f2fs_ioctl,