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, int dir_level)
26 if (level + dir_level < MAX_DIR_HASH_DEPTH / 2)
27 return 1 << (level + dir_level);
29 return MAX_DIR_BUCKETS;
32 static unsigned int bucket_blocks(unsigned int level)
34 if (level < MAX_DIR_HASH_DEPTH / 2)
40 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 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,
69 int dir_level, unsigned int idx)
72 unsigned long bidx = 0;
74 for (i = 0; i < level; i++)
75 bidx += dir_buckets(i, dir_level) * bucket_blocks(i);
76 bidx += idx * bucket_blocks(level);
80 bool early_match_name(size_t namelen, f2fs_hash_t namehash,
81 struct f2fs_dir_entry *de)
83 if (le16_to_cpu(de->name_len) != namelen)
86 if (de->hash_code != namehash)
92 static struct f2fs_dir_entry *find_in_block(struct page *dentry_page,
93 struct qstr *name, int *max_slots,
94 f2fs_hash_t namehash, struct page **res_page)
96 struct f2fs_dir_entry *de;
97 unsigned long bit_pos = 0;
98 struct f2fs_dentry_block *dentry_blk = kmap(dentry_page);
99 const void *dentry_bits = &dentry_blk->dentry_bitmap;
102 while (bit_pos < NR_DENTRY_IN_BLOCK) {
103 if (!test_bit_le(bit_pos, dentry_bits)) {
106 else if (!test_bit_le(bit_pos - 1, dentry_bits))
111 de = &dentry_blk->dentry[bit_pos];
112 if (early_match_name(name->len, namehash, de)) {
113 if (!memcmp(dentry_blk->filename[bit_pos],
116 *res_page = dentry_page;
120 if (max_len > *max_slots) {
121 *max_slots = max_len;
126 * For the most part, it should be a bug when name_len is zero.
127 * We stop here for figuring out where the bugs has occurred.
129 f2fs_bug_on(F2FS_P_SB(dentry_page), !de->name_len);
131 bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
137 if (max_len > *max_slots)
138 *max_slots = max_len;
142 static struct f2fs_dir_entry *find_in_level(struct inode *dir,
143 unsigned int level, struct qstr *name,
144 f2fs_hash_t namehash, struct page **res_page)
146 int s = GET_DENTRY_SLOTS(name->len);
147 unsigned int nbucket, nblock;
148 unsigned int bidx, end_block;
149 struct page *dentry_page;
150 struct f2fs_dir_entry *de = NULL;
154 f2fs_bug_on(F2FS_I_SB(dir), level > MAX_DIR_HASH_DEPTH);
156 nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level);
157 nblock = bucket_blocks(level);
159 bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level,
160 le32_to_cpu(namehash) % nbucket);
161 end_block = bidx + nblock;
163 for (; bidx < end_block; bidx++) {
164 /* no need to allocate new dentry pages to all the indices */
165 dentry_page = find_data_page(dir, bidx, true);
166 if (IS_ERR(dentry_page)) {
171 de = find_in_block(dentry_page, name, &max_slots,
178 f2fs_put_page(dentry_page, 0);
181 if (!de && room && F2FS_I(dir)->chash != namehash) {
182 F2FS_I(dir)->chash = namehash;
183 F2FS_I(dir)->clevel = level;
190 * Find an entry in the specified directory with the wanted name.
191 * It returns the page where the entry was found (as a parameter - res_page),
192 * and the entry itself. Page is returned mapped and unlocked.
193 * Entry is guaranteed to be valid.
195 struct f2fs_dir_entry *f2fs_find_entry(struct inode *dir,
196 struct qstr *child, struct page **res_page)
198 unsigned long npages = dir_blocks(dir);
199 struct f2fs_dir_entry *de = NULL;
200 f2fs_hash_t name_hash;
201 unsigned int max_depth;
204 if (f2fs_has_inline_dentry(dir))
205 return find_in_inline_dir(dir, child, res_page);
212 name_hash = f2fs_dentry_hash(child);
213 max_depth = F2FS_I(dir)->i_current_depth;
215 for (level = 0; level < max_depth; level++) {
216 de = find_in_level(dir, level, child, name_hash, res_page);
220 if (!de && F2FS_I(dir)->chash != name_hash) {
221 F2FS_I(dir)->chash = name_hash;
222 F2FS_I(dir)->clevel = level - 1;
227 struct f2fs_dir_entry *f2fs_parent_dir(struct inode *dir, struct page **p)
230 struct f2fs_dir_entry *de;
231 struct f2fs_dentry_block *dentry_blk;
233 if (f2fs_has_inline_dentry(dir))
234 return f2fs_parent_inline_dir(dir, p);
236 page = get_lock_data_page(dir, 0);
240 dentry_blk = kmap(page);
241 de = &dentry_blk->dentry[1];
247 ino_t f2fs_inode_by_name(struct inode *dir, struct qstr *qstr)
250 struct f2fs_dir_entry *de;
253 de = f2fs_find_entry(dir, qstr, &page);
255 res = le32_to_cpu(de->ino);
256 if (!f2fs_has_inline_dentry(dir))
258 f2fs_put_page(page, 0);
264 void f2fs_set_link(struct inode *dir, struct f2fs_dir_entry *de,
265 struct page *page, struct inode *inode)
268 f2fs_wait_on_page_writeback(page, DATA);
269 de->ino = cpu_to_le32(inode->i_ino);
270 set_de_type(de, inode);
271 if (!f2fs_has_inline_dentry(dir))
273 set_page_dirty(page);
274 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
275 mark_inode_dirty(dir);
277 f2fs_put_page(page, 1);
280 static void init_dent_inode(const struct qstr *name, struct page *ipage)
282 struct f2fs_inode *ri;
284 f2fs_wait_on_page_writeback(ipage, NODE);
286 /* copy name info. to this inode page */
287 ri = F2FS_INODE(ipage);
288 ri->i_namelen = cpu_to_le32(name->len);
289 memcpy(ri->i_name, name->name, name->len);
290 set_page_dirty(ipage);
293 int update_dent_inode(struct inode *inode, const struct qstr *name)
297 page = get_node_page(F2FS_I_SB(inode), inode->i_ino);
299 return PTR_ERR(page);
301 init_dent_inode(name, page);
302 f2fs_put_page(page, 1);
307 static int make_empty_dir(struct inode *inode,
308 struct inode *parent, struct page *page)
310 struct page *dentry_page;
311 struct f2fs_dentry_block *dentry_blk;
312 struct f2fs_dir_entry *de;
314 if (f2fs_has_inline_dentry(inode))
315 return make_empty_inline_dir(inode, parent, page);
317 dentry_page = get_new_data_page(inode, page, 0, true);
318 if (IS_ERR(dentry_page))
319 return PTR_ERR(dentry_page);
321 dentry_blk = kmap_atomic(dentry_page);
323 de = &dentry_blk->dentry[0];
324 de->name_len = cpu_to_le16(1);
326 de->ino = cpu_to_le32(inode->i_ino);
327 memcpy(dentry_blk->filename[0], ".", 1);
328 set_de_type(de, inode);
330 de = &dentry_blk->dentry[1];
332 de->name_len = cpu_to_le16(2);
333 de->ino = cpu_to_le32(parent->i_ino);
334 memcpy(dentry_blk->filename[1], "..", 2);
335 set_de_type(de, inode);
337 test_and_set_bit_le(0, &dentry_blk->dentry_bitmap);
338 test_and_set_bit_le(1, &dentry_blk->dentry_bitmap);
339 kunmap_atomic(dentry_blk);
341 set_page_dirty(dentry_page);
342 f2fs_put_page(dentry_page, 1);
346 struct page *init_inode_metadata(struct inode *inode,
347 struct inode *dir, const struct qstr *name)
352 if (is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) {
353 page = new_inode_page(inode);
357 if (S_ISDIR(inode->i_mode)) {
358 err = make_empty_dir(inode, dir, page);
363 err = f2fs_init_acl(inode, dir, page);
367 err = f2fs_init_security(inode, dir, name, page);
371 page = get_node_page(F2FS_I_SB(dir), inode->i_ino);
375 set_cold_node(inode, page);
379 init_dent_inode(name, page);
382 * This file should be checkpointed during fsync.
383 * We lost i_pino from now on.
385 if (is_inode_flag_set(F2FS_I(inode), FI_INC_LINK)) {
386 file_lost_pino(inode);
388 * If link the tmpfile to alias through linkat path,
389 * we should remove this inode from orphan list.
391 if (inode->i_nlink == 0)
392 remove_orphan_inode(F2FS_I_SB(dir), inode->i_ino);
398 f2fs_put_page(page, 1);
400 /* once the failed inode becomes a bad inode, i_mode is S_IFREG */
401 truncate_inode_pages(&inode->i_data, 0);
402 truncate_blocks(inode, 0, false);
403 remove_dirty_dir_inode(inode);
404 remove_inode_page(inode);
408 void update_parent_metadata(struct inode *dir, struct inode *inode,
409 unsigned int current_depth)
411 if (is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) {
412 if (S_ISDIR(inode->i_mode)) {
414 set_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
416 clear_inode_flag(F2FS_I(inode), FI_NEW_INODE);
418 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
419 mark_inode_dirty(dir);
421 if (F2FS_I(dir)->i_current_depth != current_depth) {
422 F2FS_I(dir)->i_current_depth = current_depth;
423 set_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
426 if (is_inode_flag_set(F2FS_I(inode), FI_INC_LINK))
427 clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
430 int room_for_filename(const void *bitmap, int slots, int max_slots)
433 int zero_start, zero_end;
435 zero_start = find_next_zero_bit_le(bitmap, max_slots, bit_start);
436 if (zero_start >= max_slots)
439 zero_end = find_next_bit_le(bitmap, max_slots, zero_start);
440 if (zero_end - zero_start >= slots)
443 bit_start = zero_end + 1;
445 if (zero_end + 1 >= max_slots)
451 * Caller should grab and release a rwsem by calling f2fs_lock_op() and
454 int __f2fs_add_link(struct inode *dir, const struct qstr *name,
457 unsigned int bit_pos;
459 unsigned int current_depth;
460 unsigned long bidx, block;
461 f2fs_hash_t dentry_hash;
462 struct f2fs_dir_entry *de;
463 unsigned int nbucket, nblock;
464 size_t namelen = name->len;
465 struct page *dentry_page = NULL;
466 struct f2fs_dentry_block *dentry_blk = NULL;
467 int slots = GET_DENTRY_SLOTS(namelen);
472 if (f2fs_has_inline_dentry(dir)) {
473 err = f2fs_add_inline_entry(dir, name, inode);
474 if (!err || err != -EAGAIN)
480 dentry_hash = f2fs_dentry_hash(name);
482 current_depth = F2FS_I(dir)->i_current_depth;
483 if (F2FS_I(dir)->chash == dentry_hash) {
484 level = F2FS_I(dir)->clevel;
485 F2FS_I(dir)->chash = 0;
489 if (unlikely(current_depth == MAX_DIR_HASH_DEPTH))
492 /* Increase the depth, if required */
493 if (level == current_depth)
496 nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level);
497 nblock = bucket_blocks(level);
499 bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level,
500 (le32_to_cpu(dentry_hash) % nbucket));
502 for (block = bidx; block <= (bidx + nblock - 1); block++) {
503 dentry_page = get_new_data_page(dir, NULL, block, true);
504 if (IS_ERR(dentry_page))
505 return PTR_ERR(dentry_page);
507 dentry_blk = kmap(dentry_page);
508 bit_pos = room_for_filename(&dentry_blk->dentry_bitmap,
509 slots, NR_DENTRY_IN_BLOCK);
510 if (bit_pos < NR_DENTRY_IN_BLOCK)
514 f2fs_put_page(dentry_page, 1);
517 /* Move to next level to find the empty slot for new dentry */
521 f2fs_wait_on_page_writeback(dentry_page, DATA);
523 down_write(&F2FS_I(inode)->i_sem);
524 page = init_inode_metadata(inode, dir, name);
529 de = &dentry_blk->dentry[bit_pos];
530 de->hash_code = dentry_hash;
531 de->name_len = cpu_to_le16(namelen);
532 memcpy(dentry_blk->filename[bit_pos], name->name, name->len);
533 de->ino = cpu_to_le32(inode->i_ino);
534 set_de_type(de, inode);
535 for (i = 0; i < slots; i++)
536 test_and_set_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap);
537 set_page_dirty(dentry_page);
539 /* we don't need to mark_inode_dirty now */
540 F2FS_I(inode)->i_pino = dir->i_ino;
541 update_inode(inode, page);
542 f2fs_put_page(page, 1);
544 update_parent_metadata(dir, inode, current_depth);
546 up_write(&F2FS_I(inode)->i_sem);
548 if (is_inode_flag_set(F2FS_I(dir), FI_UPDATE_DIR)) {
549 update_inode_page(dir);
550 clear_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
553 f2fs_put_page(dentry_page, 1);
557 int f2fs_do_tmpfile(struct inode *inode, struct inode *dir)
562 down_write(&F2FS_I(inode)->i_sem);
563 page = init_inode_metadata(inode, dir, NULL);
568 /* we don't need to mark_inode_dirty now */
569 update_inode(inode, page);
570 f2fs_put_page(page, 1);
572 clear_inode_flag(F2FS_I(inode), FI_NEW_INODE);
574 up_write(&F2FS_I(inode)->i_sem);
578 void f2fs_drop_nlink(struct inode *dir, struct inode *inode, struct page *page)
580 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
582 down_write(&F2FS_I(inode)->i_sem);
584 if (S_ISDIR(inode->i_mode)) {
587 update_inode(dir, page);
589 update_inode_page(dir);
591 inode->i_ctime = CURRENT_TIME;
594 if (S_ISDIR(inode->i_mode)) {
596 i_size_write(inode, 0);
598 up_write(&F2FS_I(inode)->i_sem);
599 update_inode_page(inode);
601 if (inode->i_nlink == 0)
602 add_orphan_inode(sbi, inode->i_ino);
604 release_orphan_inode(sbi);
608 * It only removes the dentry from the dentry page, corresponding name
609 * entry in name page does not need to be touched during deletion.
611 void f2fs_delete_entry(struct f2fs_dir_entry *dentry, struct page *page,
612 struct inode *dir, struct inode *inode)
614 struct f2fs_dentry_block *dentry_blk;
615 unsigned int bit_pos;
616 int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len));
619 if (f2fs_has_inline_dentry(dir))
620 return f2fs_delete_inline_entry(dentry, page, dir, inode);
623 f2fs_wait_on_page_writeback(page, DATA);
625 dentry_blk = page_address(page);
626 bit_pos = dentry - dentry_blk->dentry;
627 for (i = 0; i < slots; i++)
628 test_and_clear_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap);
630 /* Let's check and deallocate this dentry page */
631 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
634 kunmap(page); /* kunmap - pair of f2fs_find_entry */
635 set_page_dirty(page);
637 dir->i_ctime = dir->i_mtime = CURRENT_TIME;
640 f2fs_drop_nlink(dir, inode, NULL);
642 if (bit_pos == NR_DENTRY_IN_BLOCK) {
643 truncate_hole(dir, page->index, page->index + 1);
644 clear_page_dirty_for_io(page);
645 ClearPageUptodate(page);
646 inode_dec_dirty_pages(dir);
648 f2fs_put_page(page, 1);
651 bool f2fs_empty_dir(struct inode *dir)
654 struct page *dentry_page;
655 unsigned int bit_pos;
656 struct f2fs_dentry_block *dentry_blk;
657 unsigned long nblock = dir_blocks(dir);
659 if (f2fs_has_inline_dentry(dir))
660 return f2fs_empty_inline_dir(dir);
662 for (bidx = 0; bidx < nblock; bidx++) {
663 dentry_page = get_lock_data_page(dir, bidx);
664 if (IS_ERR(dentry_page)) {
665 if (PTR_ERR(dentry_page) == -ENOENT)
671 dentry_blk = kmap_atomic(dentry_page);
676 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
679 kunmap_atomic(dentry_blk);
681 f2fs_put_page(dentry_page, 1);
683 if (bit_pos < NR_DENTRY_IN_BLOCK)
689 static int f2fs_readdir(struct file *file, struct dir_context *ctx)
691 struct inode *inode = file_inode(file);
692 unsigned long npages = dir_blocks(inode);
693 unsigned int bit_pos = 0;
694 struct f2fs_dentry_block *dentry_blk = NULL;
695 struct f2fs_dir_entry *de = NULL;
696 struct page *dentry_page = NULL;
697 struct file_ra_state *ra = &file->f_ra;
698 unsigned int n = ((unsigned long)ctx->pos / NR_DENTRY_IN_BLOCK);
699 unsigned char d_type = DT_UNKNOWN;
701 if (f2fs_has_inline_dentry(inode))
702 return f2fs_read_inline_dir(file, ctx);
704 bit_pos = ((unsigned long)ctx->pos % NR_DENTRY_IN_BLOCK);
706 /* readahead for multi pages of dir */
707 if (npages - n > 1 && !ra_has_index(ra, n))
708 page_cache_sync_readahead(inode->i_mapping, ra, file, n,
709 min(npages - n, (pgoff_t)MAX_DIR_RA_PAGES));
711 for (; n < npages; n++) {
712 dentry_page = get_lock_data_page(inode, n);
713 if (IS_ERR(dentry_page))
716 dentry_blk = kmap(dentry_page);
717 while (bit_pos < NR_DENTRY_IN_BLOCK) {
718 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
721 if (bit_pos >= NR_DENTRY_IN_BLOCK)
724 de = &dentry_blk->dentry[bit_pos];
725 if (de->file_type < F2FS_FT_MAX)
726 d_type = f2fs_filetype_table[de->file_type];
730 dentry_blk->filename[bit_pos],
731 le16_to_cpu(de->name_len),
732 le32_to_cpu(de->ino), d_type))
735 bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
736 ctx->pos = n * NR_DENTRY_IN_BLOCK + bit_pos;
739 ctx->pos = (n + 1) * NR_DENTRY_IN_BLOCK;
741 f2fs_put_page(dentry_page, 1);
745 if (dentry_page && !IS_ERR(dentry_page)) {
747 f2fs_put_page(dentry_page, 1);
753 const struct file_operations f2fs_dir_operations = {
754 .llseek = generic_file_llseek,
755 .read = generic_read_dir,
756 .iterate = f2fs_readdir,
757 .fsync = f2fs_sync_file,
758 .unlocked_ioctl = f2fs_ioctl,