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);
260 /* update parent inode number before releasing dentry page */
261 F2FS_I(inode)->i_pino = dir->i_ino;
263 f2fs_put_page(page, 1);
264 mutex_unlock_op(sbi, DENTRY_OPS);
267 void init_dent_inode(struct dentry *dentry, struct page *ipage)
269 struct f2fs_node *rn;
274 wait_on_page_writeback(ipage);
276 /* copy dentry info. to this inode page */
277 rn = (struct f2fs_node *)page_address(ipage);
278 rn->i.i_namelen = cpu_to_le32(dentry->d_name.len);
279 memcpy(rn->i.i_name, dentry->d_name.name, dentry->d_name.len);
280 set_page_dirty(ipage);
283 static int init_inode_metadata(struct inode *inode, struct dentry *dentry)
285 struct inode *dir = dentry->d_parent->d_inode;
287 if (is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) {
289 err = new_inode_page(inode, dentry);
293 if (S_ISDIR(inode->i_mode)) {
294 err = f2fs_make_empty(inode, dir);
296 remove_inode_page(inode);
301 err = f2fs_init_acl(inode, dir);
303 remove_inode_page(inode);
308 ipage = get_node_page(F2FS_SB(dir->i_sb), inode->i_ino);
310 return PTR_ERR(ipage);
311 init_dent_inode(dentry, ipage);
312 f2fs_put_page(ipage, 1);
314 if (is_inode_flag_set(F2FS_I(inode), FI_INC_LINK)) {
316 f2fs_write_inode(inode, NULL);
321 static void update_parent_metadata(struct inode *dir, struct inode *inode,
322 unsigned int current_depth)
324 bool need_dir_update = false;
326 if (is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) {
327 if (S_ISDIR(inode->i_mode)) {
329 need_dir_update = true;
331 clear_inode_flag(F2FS_I(inode), FI_NEW_INODE);
333 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
334 if (F2FS_I(dir)->i_current_depth != current_depth) {
335 F2FS_I(dir)->i_current_depth = current_depth;
336 need_dir_update = true;
340 f2fs_write_inode(dir, NULL);
342 mark_inode_dirty(dir);
344 if (is_inode_flag_set(F2FS_I(inode), FI_INC_LINK))
345 clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
348 static int room_for_filename(struct f2fs_dentry_block *dentry_blk, int slots)
351 int zero_start, zero_end;
353 zero_start = find_next_zero_bit_le(&dentry_blk->dentry_bitmap,
356 if (zero_start >= NR_DENTRY_IN_BLOCK)
357 return NR_DENTRY_IN_BLOCK;
359 zero_end = find_next_bit_le(&dentry_blk->dentry_bitmap,
362 if (zero_end - zero_start >= slots)
365 bit_start = zero_end + 1;
367 if (zero_end + 1 >= NR_DENTRY_IN_BLOCK)
368 return NR_DENTRY_IN_BLOCK;
372 int f2fs_add_link(struct dentry *dentry, struct inode *inode)
374 unsigned int bit_pos;
376 unsigned int current_depth;
377 unsigned long bidx, block;
378 f2fs_hash_t dentry_hash;
379 struct f2fs_dir_entry *de;
380 unsigned int nbucket, nblock;
381 struct inode *dir = dentry->d_parent->d_inode;
382 struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
383 const char *name = dentry->d_name.name;
384 int namelen = dentry->d_name.len;
385 struct page *dentry_page = NULL;
386 struct f2fs_dentry_block *dentry_blk = NULL;
387 int slots = GET_DENTRY_SLOTS(namelen);
391 dentry_hash = f2fs_dentry_hash(name, dentry->d_name.len);
393 current_depth = F2FS_I(dir)->i_current_depth;
394 if (F2FS_I(dir)->chash == dentry_hash) {
395 level = F2FS_I(dir)->clevel;
396 F2FS_I(dir)->chash = 0;
400 if (current_depth == MAX_DIR_HASH_DEPTH)
403 /* Increase the depth, if required */
404 if (level == current_depth)
407 nbucket = dir_buckets(level);
408 nblock = bucket_blocks(level);
410 bidx = dir_block_index(level, (le32_to_cpu(dentry_hash) % nbucket));
412 for (block = bidx; block <= (bidx + nblock - 1); block++) {
413 mutex_lock_op(sbi, DENTRY_OPS);
414 dentry_page = get_new_data_page(dir, block, true);
415 if (IS_ERR(dentry_page)) {
416 mutex_unlock_op(sbi, DENTRY_OPS);
417 return PTR_ERR(dentry_page);
420 dentry_blk = kmap(dentry_page);
421 bit_pos = room_for_filename(dentry_blk, slots);
422 if (bit_pos < NR_DENTRY_IN_BLOCK)
426 f2fs_put_page(dentry_page, 1);
427 mutex_unlock_op(sbi, DENTRY_OPS);
430 /* Move to next level to find the empty slot for new dentry */
434 err = init_inode_metadata(inode, dentry);
438 wait_on_page_writeback(dentry_page);
440 de = &dentry_blk->dentry[bit_pos];
441 de->hash_code = dentry_hash;
442 de->name_len = cpu_to_le16(namelen);
443 memcpy(dentry_blk->filename[bit_pos], name, namelen);
444 de->ino = cpu_to_le32(inode->i_ino);
445 set_de_type(de, inode);
446 for (i = 0; i < slots; i++)
447 test_and_set_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap);
448 set_page_dirty(dentry_page);
450 update_parent_metadata(dir, inode, current_depth);
452 /* update parent inode number before releasing dentry page */
453 F2FS_I(inode)->i_pino = dir->i_ino;
456 f2fs_put_page(dentry_page, 1);
457 mutex_unlock_op(sbi, DENTRY_OPS);
462 * It only removes the dentry from the dentry page,corresponding name
463 * entry in name page does not need to be touched during deletion.
465 void f2fs_delete_entry(struct f2fs_dir_entry *dentry, struct page *page,
468 struct f2fs_dentry_block *dentry_blk;
469 unsigned int bit_pos;
470 struct address_space *mapping = page->mapping;
471 struct inode *dir = mapping->host;
472 struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
473 int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len));
474 void *kaddr = page_address(page);
477 mutex_lock_op(sbi, DENTRY_OPS);
480 wait_on_page_writeback(page);
482 dentry_blk = (struct f2fs_dentry_block *)kaddr;
483 bit_pos = dentry - (struct f2fs_dir_entry *)dentry_blk->dentry;
484 for (i = 0; i < slots; i++)
485 test_and_clear_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap);
487 /* Let's check and deallocate this dentry page */
488 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
491 kunmap(page); /* kunmap - pair of f2fs_find_entry */
492 set_page_dirty(page);
494 dir->i_ctime = dir->i_mtime = CURRENT_TIME;
496 if (inode && S_ISDIR(inode->i_mode)) {
498 f2fs_write_inode(dir, NULL);
500 mark_inode_dirty(dir);
504 inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME;
506 if (S_ISDIR(inode->i_mode)) {
508 i_size_write(inode, 0);
510 f2fs_write_inode(inode, NULL);
511 if (inode->i_nlink == 0)
512 add_orphan_inode(sbi, inode->i_ino);
515 if (bit_pos == NR_DENTRY_IN_BLOCK) {
516 truncate_hole(dir, page->index, page->index + 1);
517 clear_page_dirty_for_io(page);
518 ClearPageUptodate(page);
519 dec_page_count(sbi, F2FS_DIRTY_DENTS);
520 inode_dec_dirty_dents(dir);
522 f2fs_put_page(page, 1);
524 mutex_unlock_op(sbi, DENTRY_OPS);
527 int f2fs_make_empty(struct inode *inode, struct inode *parent)
529 struct page *dentry_page;
530 struct f2fs_dentry_block *dentry_blk;
531 struct f2fs_dir_entry *de;
534 dentry_page = get_new_data_page(inode, 0, true);
535 if (IS_ERR(dentry_page))
536 return PTR_ERR(dentry_page);
538 kaddr = kmap_atomic(dentry_page);
539 dentry_blk = (struct f2fs_dentry_block *)kaddr;
541 de = &dentry_blk->dentry[0];
542 de->name_len = cpu_to_le16(1);
544 de->ino = cpu_to_le32(inode->i_ino);
545 memcpy(dentry_blk->filename[0], ".", 1);
546 set_de_type(de, inode);
548 de = &dentry_blk->dentry[1];
550 de->name_len = cpu_to_le16(2);
551 de->ino = cpu_to_le32(parent->i_ino);
552 memcpy(dentry_blk->filename[1], "..", 2);
553 set_de_type(de, inode);
555 test_and_set_bit_le(0, &dentry_blk->dentry_bitmap);
556 test_and_set_bit_le(1, &dentry_blk->dentry_bitmap);
557 kunmap_atomic(kaddr);
559 set_page_dirty(dentry_page);
560 f2fs_put_page(dentry_page, 1);
564 bool f2fs_empty_dir(struct inode *dir)
567 struct page *dentry_page;
568 unsigned int bit_pos;
569 struct f2fs_dentry_block *dentry_blk;
570 unsigned long nblock = dir_blocks(dir);
572 for (bidx = 0; bidx < nblock; bidx++) {
574 dentry_page = get_lock_data_page(dir, bidx);
575 if (IS_ERR(dentry_page)) {
576 if (PTR_ERR(dentry_page) == -ENOENT)
582 kaddr = kmap_atomic(dentry_page);
583 dentry_blk = (struct f2fs_dentry_block *)kaddr;
588 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
591 kunmap_atomic(kaddr);
593 f2fs_put_page(dentry_page, 1);
595 if (bit_pos < NR_DENTRY_IN_BLOCK)
601 static int f2fs_readdir(struct file *file, void *dirent, filldir_t filldir)
603 unsigned long pos = file->f_pos;
604 struct inode *inode = file->f_dentry->d_inode;
605 unsigned long npages = dir_blocks(inode);
606 unsigned char *types = NULL;
607 unsigned int bit_pos = 0, start_bit_pos = 0;
609 struct f2fs_dentry_block *dentry_blk = NULL;
610 struct f2fs_dir_entry *de = NULL;
611 struct page *dentry_page = NULL;
613 unsigned char d_type = DT_UNKNOWN;
616 types = f2fs_filetype_table;
617 bit_pos = (pos % NR_DENTRY_IN_BLOCK);
618 n = (pos / NR_DENTRY_IN_BLOCK);
620 for ( ; n < npages; n++) {
621 dentry_page = get_lock_data_page(inode, n);
622 if (IS_ERR(dentry_page))
625 start_bit_pos = bit_pos;
626 dentry_blk = kmap(dentry_page);
627 while (bit_pos < NR_DENTRY_IN_BLOCK) {
629 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
632 if (bit_pos >= NR_DENTRY_IN_BLOCK)
635 de = &dentry_blk->dentry[bit_pos];
636 if (types && de->file_type < F2FS_FT_MAX)
637 d_type = types[de->file_type];
639 over = filldir(dirent,
640 dentry_blk->filename[bit_pos],
641 le16_to_cpu(de->name_len),
642 (n * NR_DENTRY_IN_BLOCK) + bit_pos,
643 le32_to_cpu(de->ino), d_type);
645 file->f_pos += bit_pos - start_bit_pos;
648 slots = GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
652 file->f_pos = (n + 1) * NR_DENTRY_IN_BLOCK;
654 f2fs_put_page(dentry_page, 1);
658 if (dentry_page && !IS_ERR(dentry_page)) {
660 f2fs_put_page(dentry_page, 1);
666 const struct file_operations f2fs_dir_operations = {
667 .llseek = generic_file_llseek,
668 .read = generic_read_dir,
669 .readdir = f2fs_readdir,
670 .fsync = f2fs_sync_file,
671 .unlocked_ioctl = f2fs_ioctl,