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 < MAX_DIR_HASH_DEPTH / 2)
27 return 1 << (level + dir_level);
29 return 1 << ((MAX_DIR_HASH_DEPTH / 2 + dir_level) - 1);
32 static unsigned int bucket_blocks(unsigned int level)
34 if (level < MAX_DIR_HASH_DEPTH / 2)
40 static 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 static 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 static bool early_match_name(const char *name, size_t namelen,
81 f2fs_hash_t namehash, 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 const char *name, size_t namelen, 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, namelen, namehash, de)) {
113 if (!memcmp(dentry_blk->filename[bit_pos],
115 *res_page = dentry_page;
119 if (max_len > *max_slots) {
120 *max_slots = max_len;
123 bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
129 if (max_len > *max_slots)
130 *max_slots = max_len;
134 static struct f2fs_dir_entry *find_in_level(struct inode *dir,
135 unsigned int level, const char *name, size_t namelen,
136 f2fs_hash_t namehash, struct page **res_page)
138 int s = GET_DENTRY_SLOTS(namelen);
139 unsigned int nbucket, nblock;
140 unsigned int bidx, end_block;
141 struct page *dentry_page;
142 struct f2fs_dir_entry *de = NULL;
146 f2fs_bug_on(level > MAX_DIR_HASH_DEPTH);
148 nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level);
149 nblock = bucket_blocks(level);
151 bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level,
152 le32_to_cpu(namehash) % nbucket);
153 end_block = bidx + nblock;
155 for (; bidx < end_block; bidx++) {
156 /* no need to allocate new dentry pages to all the indices */
157 dentry_page = find_data_page(dir, bidx, true);
158 if (IS_ERR(dentry_page)) {
163 de = find_in_block(dentry_page, name, namelen,
164 &max_slots, namehash, res_page);
170 f2fs_put_page(dentry_page, 0);
173 if (!de && room && F2FS_I(dir)->chash != namehash) {
174 F2FS_I(dir)->chash = namehash;
175 F2FS_I(dir)->clevel = level;
182 * Find an entry in the specified directory with the wanted name.
183 * It returns the page where the entry was found (as a parameter - res_page),
184 * and the entry itself. Page is returned mapped and unlocked.
185 * Entry is guaranteed to be valid.
187 struct f2fs_dir_entry *f2fs_find_entry(struct inode *dir,
188 struct qstr *child, struct page **res_page)
190 const char *name = child->name;
191 size_t namelen = child->len;
192 unsigned long npages = dir_blocks(dir);
193 struct f2fs_dir_entry *de = NULL;
194 f2fs_hash_t name_hash;
195 unsigned int max_depth;
203 name_hash = f2fs_dentry_hash(name, namelen);
204 max_depth = F2FS_I(dir)->i_current_depth;
206 for (level = 0; level < max_depth; level++) {
207 de = find_in_level(dir, level, name,
208 namelen, name_hash, res_page);
212 if (!de && F2FS_I(dir)->chash != name_hash) {
213 F2FS_I(dir)->chash = name_hash;
214 F2FS_I(dir)->clevel = level - 1;
219 struct f2fs_dir_entry *f2fs_parent_dir(struct inode *dir, struct page **p)
222 struct f2fs_dir_entry *de;
223 struct f2fs_dentry_block *dentry_blk;
225 page = get_lock_data_page(dir, 0);
229 dentry_blk = kmap(page);
230 de = &dentry_blk->dentry[1];
236 ino_t f2fs_inode_by_name(struct inode *dir, struct qstr *qstr)
239 struct f2fs_dir_entry *de;
242 de = f2fs_find_entry(dir, qstr, &page);
244 res = le32_to_cpu(de->ino);
246 f2fs_put_page(page, 0);
252 void f2fs_set_link(struct inode *dir, struct f2fs_dir_entry *de,
253 struct page *page, struct inode *inode)
256 wait_on_page_writeback(page);
257 de->ino = cpu_to_le32(inode->i_ino);
258 set_de_type(de, inode);
260 set_page_dirty(page);
261 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
262 mark_inode_dirty(dir);
264 f2fs_put_page(page, 1);
267 static void init_dent_inode(const struct qstr *name, struct page *ipage)
269 struct f2fs_inode *ri;
271 /* copy name info. to this inode page */
272 ri = F2FS_INODE(ipage);
273 ri->i_namelen = cpu_to_le32(name->len);
274 memcpy(ri->i_name, name->name, name->len);
275 set_page_dirty(ipage);
278 int update_dent_inode(struct inode *inode, const struct qstr *name)
280 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
283 page = get_node_page(sbi, inode->i_ino);
285 return PTR_ERR(page);
287 init_dent_inode(name, page);
288 f2fs_put_page(page, 1);
293 static int make_empty_dir(struct inode *inode,
294 struct inode *parent, struct page *page)
296 struct page *dentry_page;
297 struct f2fs_dentry_block *dentry_blk;
298 struct f2fs_dir_entry *de;
301 dentry_page = get_new_data_page(inode, page, 0, true);
302 if (IS_ERR(dentry_page))
303 return PTR_ERR(dentry_page);
305 kaddr = kmap_atomic(dentry_page);
306 dentry_blk = (struct f2fs_dentry_block *)kaddr;
308 de = &dentry_blk->dentry[0];
309 de->name_len = cpu_to_le16(1);
311 de->ino = cpu_to_le32(inode->i_ino);
312 memcpy(dentry_blk->filename[0], ".", 1);
313 set_de_type(de, inode);
315 de = &dentry_blk->dentry[1];
317 de->name_len = cpu_to_le16(2);
318 de->ino = cpu_to_le32(parent->i_ino);
319 memcpy(dentry_blk->filename[1], "..", 2);
320 set_de_type(de, inode);
322 test_and_set_bit_le(0, &dentry_blk->dentry_bitmap);
323 test_and_set_bit_le(1, &dentry_blk->dentry_bitmap);
324 kunmap_atomic(kaddr);
326 set_page_dirty(dentry_page);
327 f2fs_put_page(dentry_page, 1);
331 static struct page *init_inode_metadata(struct inode *inode,
332 struct inode *dir, const struct qstr *name)
337 if (is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) {
338 page = new_inode_page(inode, name);
342 if (S_ISDIR(inode->i_mode)) {
343 err = make_empty_dir(inode, dir, page);
348 err = f2fs_init_acl(inode, dir, page);
352 err = f2fs_init_security(inode, dir, name, page);
356 wait_on_page_writeback(page);
358 page = get_node_page(F2FS_SB(dir->i_sb), inode->i_ino);
362 wait_on_page_writeback(page);
363 set_cold_node(inode, page);
366 init_dent_inode(name, page);
369 * This file should be checkpointed during fsync.
370 * We lost i_pino from now on.
372 if (is_inode_flag_set(F2FS_I(inode), FI_INC_LINK)) {
373 file_lost_pino(inode);
379 f2fs_put_page(page, 1);
380 /* once the failed inode becomes a bad inode, i_mode is S_IFREG */
381 truncate_inode_pages(&inode->i_data, 0);
382 truncate_blocks(inode, 0);
383 remove_dirty_dir_inode(inode);
385 remove_inode_page(inode);
389 static void update_parent_metadata(struct inode *dir, struct inode *inode,
390 unsigned int current_depth)
392 if (is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) {
393 if (S_ISDIR(inode->i_mode)) {
395 set_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
397 clear_inode_flag(F2FS_I(inode), FI_NEW_INODE);
399 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
400 mark_inode_dirty(dir);
402 if (F2FS_I(dir)->i_current_depth != current_depth) {
403 F2FS_I(dir)->i_current_depth = current_depth;
404 set_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
407 if (is_inode_flag_set(F2FS_I(inode), FI_INC_LINK))
408 clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
411 static int room_for_filename(struct f2fs_dentry_block *dentry_blk, int slots)
414 int zero_start, zero_end;
416 zero_start = find_next_zero_bit_le(&dentry_blk->dentry_bitmap,
419 if (zero_start >= NR_DENTRY_IN_BLOCK)
420 return NR_DENTRY_IN_BLOCK;
422 zero_end = find_next_bit_le(&dentry_blk->dentry_bitmap,
425 if (zero_end - zero_start >= slots)
428 bit_start = zero_end + 1;
430 if (zero_end + 1 >= NR_DENTRY_IN_BLOCK)
431 return NR_DENTRY_IN_BLOCK;
436 * Caller should grab and release a rwsem by calling f2fs_lock_op() and
439 int __f2fs_add_link(struct inode *dir, const struct qstr *name,
442 unsigned int bit_pos;
444 unsigned int current_depth;
445 unsigned long bidx, block;
446 f2fs_hash_t dentry_hash;
447 struct f2fs_dir_entry *de;
448 unsigned int nbucket, nblock;
449 size_t namelen = name->len;
450 struct page *dentry_page = NULL;
451 struct f2fs_dentry_block *dentry_blk = NULL;
452 int slots = GET_DENTRY_SLOTS(namelen);
457 dentry_hash = f2fs_dentry_hash(name->name, name->len);
459 current_depth = F2FS_I(dir)->i_current_depth;
460 if (F2FS_I(dir)->chash == dentry_hash) {
461 level = F2FS_I(dir)->clevel;
462 F2FS_I(dir)->chash = 0;
466 if (unlikely(current_depth == MAX_DIR_HASH_DEPTH))
469 /* Increase the depth, if required */
470 if (level == current_depth)
473 nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level);
474 nblock = bucket_blocks(level);
476 bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level,
477 (le32_to_cpu(dentry_hash) % nbucket));
479 for (block = bidx; block <= (bidx + nblock - 1); block++) {
480 dentry_page = get_new_data_page(dir, NULL, block, true);
481 if (IS_ERR(dentry_page))
482 return PTR_ERR(dentry_page);
484 dentry_blk = kmap(dentry_page);
485 bit_pos = room_for_filename(dentry_blk, slots);
486 if (bit_pos < NR_DENTRY_IN_BLOCK)
490 f2fs_put_page(dentry_page, 1);
493 /* Move to next level to find the empty slot for new dentry */
497 wait_on_page_writeback(dentry_page);
499 page = init_inode_metadata(inode, dir, name);
504 de = &dentry_blk->dentry[bit_pos];
505 de->hash_code = dentry_hash;
506 de->name_len = cpu_to_le16(namelen);
507 memcpy(dentry_blk->filename[bit_pos], name->name, name->len);
508 de->ino = cpu_to_le32(inode->i_ino);
509 set_de_type(de, inode);
510 for (i = 0; i < slots; i++)
511 test_and_set_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap);
512 set_page_dirty(dentry_page);
514 /* we don't need to mark_inode_dirty now */
515 F2FS_I(inode)->i_pino = dir->i_ino;
516 update_inode(inode, page);
517 f2fs_put_page(page, 1);
519 update_parent_metadata(dir, inode, current_depth);
521 if (is_inode_flag_set(F2FS_I(dir), FI_UPDATE_DIR)) {
522 update_inode_page(dir);
523 clear_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
526 f2fs_put_page(dentry_page, 1);
531 * It only removes the dentry from the dentry page,corresponding name
532 * entry in name page does not need to be touched during deletion.
534 void f2fs_delete_entry(struct f2fs_dir_entry *dentry, struct page *page,
537 struct f2fs_dentry_block *dentry_blk;
538 unsigned int bit_pos;
539 struct address_space *mapping = page->mapping;
540 struct inode *dir = mapping->host;
541 int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len));
542 void *kaddr = page_address(page);
546 wait_on_page_writeback(page);
548 dentry_blk = (struct f2fs_dentry_block *)kaddr;
549 bit_pos = dentry - (struct f2fs_dir_entry *)dentry_blk->dentry;
550 for (i = 0; i < slots; i++)
551 test_and_clear_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap);
553 /* Let's check and deallocate this dentry page */
554 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
557 kunmap(page); /* kunmap - pair of f2fs_find_entry */
558 set_page_dirty(page);
560 dir->i_ctime = dir->i_mtime = CURRENT_TIME;
563 struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
565 if (S_ISDIR(inode->i_mode)) {
567 update_inode_page(dir);
569 inode->i_ctime = CURRENT_TIME;
571 if (S_ISDIR(inode->i_mode)) {
573 i_size_write(inode, 0);
575 update_inode_page(inode);
577 if (inode->i_nlink == 0)
578 add_orphan_inode(sbi, inode->i_ino);
580 release_orphan_inode(sbi);
583 if (bit_pos == NR_DENTRY_IN_BLOCK) {
584 truncate_hole(dir, page->index, page->index + 1);
585 clear_page_dirty_for_io(page);
586 ClearPageUptodate(page);
587 inode_dec_dirty_dents(dir);
589 f2fs_put_page(page, 1);
592 bool f2fs_empty_dir(struct inode *dir)
595 struct page *dentry_page;
596 unsigned int bit_pos;
597 struct f2fs_dentry_block *dentry_blk;
598 unsigned long nblock = dir_blocks(dir);
600 for (bidx = 0; bidx < nblock; bidx++) {
602 dentry_page = get_lock_data_page(dir, bidx);
603 if (IS_ERR(dentry_page)) {
604 if (PTR_ERR(dentry_page) == -ENOENT)
610 kaddr = kmap_atomic(dentry_page);
611 dentry_blk = (struct f2fs_dentry_block *)kaddr;
616 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
619 kunmap_atomic(kaddr);
621 f2fs_put_page(dentry_page, 1);
623 if (bit_pos < NR_DENTRY_IN_BLOCK)
629 static int f2fs_readdir(struct file *file, struct dir_context *ctx)
631 struct inode *inode = file_inode(file);
632 unsigned long npages = dir_blocks(inode);
633 unsigned int bit_pos = 0;
634 struct f2fs_dentry_block *dentry_blk = NULL;
635 struct f2fs_dir_entry *de = NULL;
636 struct page *dentry_page = NULL;
637 unsigned int n = ((unsigned long)ctx->pos / NR_DENTRY_IN_BLOCK);
638 unsigned char d_type = DT_UNKNOWN;
640 bit_pos = ((unsigned long)ctx->pos % NR_DENTRY_IN_BLOCK);
642 for (; n < npages; n++) {
643 dentry_page = get_lock_data_page(inode, n);
644 if (IS_ERR(dentry_page))
647 dentry_blk = kmap(dentry_page);
648 while (bit_pos < NR_DENTRY_IN_BLOCK) {
649 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
652 if (bit_pos >= NR_DENTRY_IN_BLOCK)
655 de = &dentry_blk->dentry[bit_pos];
656 if (de->file_type < F2FS_FT_MAX)
657 d_type = f2fs_filetype_table[de->file_type];
661 dentry_blk->filename[bit_pos],
662 le16_to_cpu(de->name_len),
663 le32_to_cpu(de->ino), d_type))
666 bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
667 ctx->pos = n * NR_DENTRY_IN_BLOCK + bit_pos;
670 ctx->pos = (n + 1) * NR_DENTRY_IN_BLOCK;
672 f2fs_put_page(dentry_page, 1);
676 if (dentry_page && !IS_ERR(dentry_page)) {
678 f2fs_put_page(dentry_page, 1);
684 const struct file_operations f2fs_dir_operations = {
685 .llseek = generic_file_llseek,
686 .read = generic_read_dir,
687 .iterate = f2fs_readdir,
688 .fsync = f2fs_sync_file,
689 .unlocked_ioctl = f2fs_ioctl,