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 = (le16_to_cpu(de->name_len) + F2FS_NAME_LEN - 1) /
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, int namelen,
131 f2fs_hash_t namehash, struct page **res_page)
133 int s = (namelen + F2FS_NAME_LEN - 1) / F2FS_NAME_LEN;
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);
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 int 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;
197 name_hash = f2fs_dentry_hash(name, namelen);
198 max_depth = F2FS_I(dir)->i_current_depth;
200 for (level = 0; level < max_depth; level++) {
201 de = find_in_level(dir, level, name,
202 namelen, name_hash, res_page);
206 if (!de && F2FS_I(dir)->chash != name_hash) {
207 F2FS_I(dir)->chash = name_hash;
208 F2FS_I(dir)->clevel = level - 1;
213 struct f2fs_dir_entry *f2fs_parent_dir(struct inode *dir, struct page **p)
215 struct page *page = NULL;
216 struct f2fs_dir_entry *de = NULL;
217 struct f2fs_dentry_block *dentry_blk = NULL;
219 page = get_lock_data_page(dir, 0);
223 dentry_blk = kmap(page);
224 de = &dentry_blk->dentry[1];
230 ino_t f2fs_inode_by_name(struct inode *dir, struct qstr *qstr)
233 struct f2fs_dir_entry *de;
236 de = f2fs_find_entry(dir, qstr, &page);
238 res = le32_to_cpu(de->ino);
240 f2fs_put_page(page, 0);
246 void f2fs_set_link(struct inode *dir, struct f2fs_dir_entry *de,
247 struct page *page, struct inode *inode)
249 struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
251 mutex_lock_op(sbi, DENTRY_OPS);
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);
260 f2fs_put_page(page, 1);
261 mutex_unlock_op(sbi, DENTRY_OPS);
264 void init_dent_inode(struct dentry *dentry, struct page *ipage)
266 struct inode *dir = dentry->d_parent->d_inode;
267 struct f2fs_node *rn;
272 wait_on_page_writeback(ipage);
274 /* copy dentry info. to this inode page */
275 rn = (struct f2fs_node *)page_address(ipage);
276 rn->i.i_pino = cpu_to_le32(dir->i_ino);
277 rn->i.i_namelen = cpu_to_le32(dentry->d_name.len);
278 memcpy(rn->i.i_name, dentry->d_name.name, dentry->d_name.len);
279 set_page_dirty(ipage);
282 static int init_inode_metadata(struct inode *inode, struct dentry *dentry)
284 struct inode *dir = dentry->d_parent->d_inode;
286 if (is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) {
288 err = new_inode_page(inode, dentry);
292 if (S_ISDIR(inode->i_mode)) {
293 err = f2fs_make_empty(inode, dir);
295 remove_inode_page(inode);
300 err = f2fs_init_acl(inode, dir);
302 remove_inode_page(inode);
307 ipage = get_node_page(F2FS_SB(dir->i_sb), inode->i_ino);
309 return PTR_ERR(ipage);
310 init_dent_inode(dentry, ipage);
311 f2fs_put_page(ipage, 1);
313 if (is_inode_flag_set(F2FS_I(inode), FI_INC_LINK)) {
315 f2fs_write_inode(inode, NULL);
320 static void update_parent_metadata(struct inode *dir, struct inode *inode,
321 unsigned int current_depth)
323 bool need_dir_update = false;
325 if (is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) {
326 if (S_ISDIR(inode->i_mode)) {
328 need_dir_update = true;
330 clear_inode_flag(F2FS_I(inode), FI_NEW_INODE);
332 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
333 if (F2FS_I(dir)->i_current_depth != current_depth) {
334 F2FS_I(dir)->i_current_depth = current_depth;
335 need_dir_update = true;
339 f2fs_write_inode(dir, NULL);
341 mark_inode_dirty(dir);
343 if (is_inode_flag_set(F2FS_I(inode), FI_INC_LINK))
344 clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
347 static int room_for_filename(struct f2fs_dentry_block *dentry_blk, int slots)
350 int zero_start, zero_end;
352 zero_start = find_next_zero_bit_le(&dentry_blk->dentry_bitmap,
355 if (zero_start >= NR_DENTRY_IN_BLOCK)
356 return NR_DENTRY_IN_BLOCK;
358 zero_end = find_next_bit_le(&dentry_blk->dentry_bitmap,
361 if (zero_end - zero_start >= slots)
364 bit_start = zero_end + 1;
366 if (zero_end + 1 >= NR_DENTRY_IN_BLOCK)
367 return NR_DENTRY_IN_BLOCK;
371 int f2fs_add_link(struct dentry *dentry, struct inode *inode)
373 unsigned int bit_pos;
375 unsigned int current_depth;
376 unsigned long bidx, block;
377 f2fs_hash_t dentry_hash;
378 struct f2fs_dir_entry *de;
379 unsigned int nbucket, nblock;
380 struct inode *dir = dentry->d_parent->d_inode;
381 struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
382 const char *name = dentry->d_name.name;
383 int namelen = dentry->d_name.len;
384 struct page *dentry_page = NULL;
385 struct f2fs_dentry_block *dentry_blk = NULL;
386 int slots = (namelen + F2FS_NAME_LEN - 1) / F2FS_NAME_LEN;
390 dentry_hash = f2fs_dentry_hash(name, dentry->d_name.len);
392 current_depth = F2FS_I(dir)->i_current_depth;
393 if (F2FS_I(dir)->chash == dentry_hash) {
394 level = F2FS_I(dir)->clevel;
395 F2FS_I(dir)->chash = 0;
399 if (current_depth == MAX_DIR_HASH_DEPTH)
402 /* Increase the depth, if required */
403 if (level == current_depth)
406 nbucket = dir_buckets(level);
407 nblock = bucket_blocks(level);
409 bidx = dir_block_index(level, (le32_to_cpu(dentry_hash) % nbucket));
411 for (block = bidx; block <= (bidx + nblock - 1); block++) {
412 mutex_lock_op(sbi, DENTRY_OPS);
413 dentry_page = get_new_data_page(dir, block, true);
414 if (IS_ERR(dentry_page)) {
415 mutex_unlock_op(sbi, DENTRY_OPS);
416 return PTR_ERR(dentry_page);
419 dentry_blk = kmap(dentry_page);
420 bit_pos = room_for_filename(dentry_blk, slots);
421 if (bit_pos < NR_DENTRY_IN_BLOCK)
425 f2fs_put_page(dentry_page, 1);
426 mutex_unlock_op(sbi, DENTRY_OPS);
429 /* Move to next level to find the empty slot for new dentry */
433 err = init_inode_metadata(inode, dentry);
437 wait_on_page_writeback(dentry_page);
439 de = &dentry_blk->dentry[bit_pos];
440 de->hash_code = dentry_hash;
441 de->name_len = cpu_to_le16(namelen);
442 memcpy(dentry_blk->filename[bit_pos], name, namelen);
443 de->ino = cpu_to_le32(inode->i_ino);
444 set_de_type(de, inode);
445 for (i = 0; i < slots; i++)
446 test_and_set_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap);
447 set_page_dirty(dentry_page);
448 update_parent_metadata(dir, inode, current_depth);
451 f2fs_put_page(dentry_page, 1);
452 mutex_unlock_op(sbi, DENTRY_OPS);
457 * It only removes the dentry from the dentry page,corresponding name
458 * entry in name page does not need to be touched during deletion.
460 void f2fs_delete_entry(struct f2fs_dir_entry *dentry, struct page *page,
463 struct f2fs_dentry_block *dentry_blk;
464 unsigned int bit_pos;
465 struct address_space *mapping = page->mapping;
466 struct inode *dir = mapping->host;
467 struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
468 int slots = (le16_to_cpu(dentry->name_len) + F2FS_NAME_LEN - 1) /
470 void *kaddr = page_address(page);
473 mutex_lock_op(sbi, DENTRY_OPS);
476 wait_on_page_writeback(page);
478 dentry_blk = (struct f2fs_dentry_block *)kaddr;
479 bit_pos = dentry - (struct f2fs_dir_entry *)dentry_blk->dentry;
480 for (i = 0; i < slots; i++)
481 test_and_clear_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap);
483 /* Let's check and deallocate this dentry page */
484 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
487 kunmap(page); /* kunmap - pair of f2fs_find_entry */
488 set_page_dirty(page);
490 dir->i_ctime = dir->i_mtime = CURRENT_TIME;
492 if (inode && S_ISDIR(inode->i_mode)) {
494 f2fs_write_inode(dir, NULL);
496 mark_inode_dirty(dir);
500 inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME;
502 if (S_ISDIR(inode->i_mode)) {
504 i_size_write(inode, 0);
506 f2fs_write_inode(inode, NULL);
507 if (inode->i_nlink == 0)
508 add_orphan_inode(sbi, inode->i_ino);
511 if (bit_pos == NR_DENTRY_IN_BLOCK) {
512 truncate_hole(dir, page->index, page->index + 1);
513 clear_page_dirty_for_io(page);
514 ClearPageUptodate(page);
515 dec_page_count(sbi, F2FS_DIRTY_DENTS);
516 inode_dec_dirty_dents(dir);
518 f2fs_put_page(page, 1);
520 mutex_unlock_op(sbi, DENTRY_OPS);
523 int f2fs_make_empty(struct inode *inode, struct inode *parent)
525 struct page *dentry_page;
526 struct f2fs_dentry_block *dentry_blk;
527 struct f2fs_dir_entry *de;
530 dentry_page = get_new_data_page(inode, 0, true);
531 if (IS_ERR(dentry_page))
532 return PTR_ERR(dentry_page);
534 kaddr = kmap_atomic(dentry_page);
535 dentry_blk = (struct f2fs_dentry_block *)kaddr;
537 de = &dentry_blk->dentry[0];
538 de->name_len = cpu_to_le16(1);
540 de->ino = cpu_to_le32(inode->i_ino);
541 memcpy(dentry_blk->filename[0], ".", 1);
542 set_de_type(de, inode);
544 de = &dentry_blk->dentry[1];
546 de->name_len = cpu_to_le16(2);
547 de->ino = cpu_to_le32(parent->i_ino);
548 memcpy(dentry_blk->filename[1], "..", 2);
549 set_de_type(de, inode);
551 test_and_set_bit_le(0, &dentry_blk->dentry_bitmap);
552 test_and_set_bit_le(1, &dentry_blk->dentry_bitmap);
553 kunmap_atomic(kaddr);
555 set_page_dirty(dentry_page);
556 f2fs_put_page(dentry_page, 1);
560 bool f2fs_empty_dir(struct inode *dir)
563 struct page *dentry_page;
564 unsigned int bit_pos;
565 struct f2fs_dentry_block *dentry_blk;
566 unsigned long nblock = dir_blocks(dir);
568 for (bidx = 0; bidx < nblock; bidx++) {
570 dentry_page = get_lock_data_page(dir, bidx);
571 if (IS_ERR(dentry_page)) {
572 if (PTR_ERR(dentry_page) == -ENOENT)
578 kaddr = kmap_atomic(dentry_page);
579 dentry_blk = (struct f2fs_dentry_block *)kaddr;
584 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
587 kunmap_atomic(kaddr);
589 f2fs_put_page(dentry_page, 1);
591 if (bit_pos < NR_DENTRY_IN_BLOCK)
597 static int f2fs_readdir(struct file *file, void *dirent, filldir_t filldir)
599 unsigned long pos = file->f_pos;
600 struct inode *inode = file->f_dentry->d_inode;
601 unsigned long npages = dir_blocks(inode);
602 unsigned char *types = NULL;
603 unsigned int bit_pos = 0, start_bit_pos = 0;
605 struct f2fs_dentry_block *dentry_blk = NULL;
606 struct f2fs_dir_entry *de = NULL;
607 struct page *dentry_page = NULL;
609 unsigned char d_type = DT_UNKNOWN;
612 types = f2fs_filetype_table;
613 bit_pos = (pos % NR_DENTRY_IN_BLOCK);
614 n = (pos / NR_DENTRY_IN_BLOCK);
616 for ( ; n < npages; n++) {
617 dentry_page = get_lock_data_page(inode, n);
618 if (IS_ERR(dentry_page))
621 start_bit_pos = bit_pos;
622 dentry_blk = kmap(dentry_page);
623 while (bit_pos < NR_DENTRY_IN_BLOCK) {
625 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
628 if (bit_pos >= NR_DENTRY_IN_BLOCK)
631 de = &dentry_blk->dentry[bit_pos];
632 if (types && de->file_type < F2FS_FT_MAX)
633 d_type = types[de->file_type];
635 over = filldir(dirent,
636 dentry_blk->filename[bit_pos],
637 le16_to_cpu(de->name_len),
638 (n * NR_DENTRY_IN_BLOCK) + bit_pos,
639 le32_to_cpu(de->ino), d_type);
641 file->f_pos += bit_pos - start_bit_pos;
644 slots = (le16_to_cpu(de->name_len) + F2FS_NAME_LEN - 1)
649 file->f_pos = (n + 1) * NR_DENTRY_IN_BLOCK;
651 f2fs_put_page(dentry_page, 1);
655 if (dentry_page && !IS_ERR(dentry_page)) {
657 f2fs_put_page(dentry_page, 1);
663 const struct file_operations f2fs_dir_operations = {
664 .llseek = generic_file_llseek,
665 .read = generic_read_dir,
666 .readdir = f2fs_readdir,
667 .fsync = f2fs_sync_file,
668 .unlocked_ioctl = f2fs_ioctl,