blob: 951ed52748f6171a3bc1097a3d806f0df37c778c [file] [log] [blame]
Jaegeuk Kim0a8165d2012-11-29 13:28:09 +09001/*
Jaegeuk Kim6b4ea012012-11-14 16:59:04 +09002 * fs/f2fs/dir.c
3 *
4 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
5 * http://www.samsung.com/
6 *
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.
10 */
11#include <linux/fs.h>
12#include <linux/f2fs_fs.h>
13#include "f2fs.h"
Jaegeuk Kim398b1ac2012-12-19 15:28:39 +090014#include "node.h"
Jaegeuk Kim6b4ea012012-11-14 16:59:04 +090015#include "acl.h"
16
17static unsigned long dir_blocks(struct inode *inode)
18{
19 return ((unsigned long long) (i_size_read(inode) + PAGE_CACHE_SIZE - 1))
20 >> PAGE_CACHE_SHIFT;
21}
22
23static unsigned int dir_buckets(unsigned int level)
24{
25 if (level < MAX_DIR_HASH_DEPTH / 2)
26 return 1 << level;
27 else
28 return 1 << ((MAX_DIR_HASH_DEPTH / 2) - 1);
29}
30
31static unsigned int bucket_blocks(unsigned int level)
32{
33 if (level < MAX_DIR_HASH_DEPTH / 2)
34 return 2;
35 else
36 return 4;
37}
38
39static unsigned char f2fs_filetype_table[F2FS_FT_MAX] = {
40 [F2FS_FT_UNKNOWN] = DT_UNKNOWN,
41 [F2FS_FT_REG_FILE] = DT_REG,
42 [F2FS_FT_DIR] = DT_DIR,
43 [F2FS_FT_CHRDEV] = DT_CHR,
44 [F2FS_FT_BLKDEV] = DT_BLK,
45 [F2FS_FT_FIFO] = DT_FIFO,
46 [F2FS_FT_SOCK] = DT_SOCK,
47 [F2FS_FT_SYMLINK] = DT_LNK,
48};
49
50#define S_SHIFT 12
51static unsigned char f2fs_type_by_mode[S_IFMT >> S_SHIFT] = {
52 [S_IFREG >> S_SHIFT] = F2FS_FT_REG_FILE,
53 [S_IFDIR >> S_SHIFT] = F2FS_FT_DIR,
54 [S_IFCHR >> S_SHIFT] = F2FS_FT_CHRDEV,
55 [S_IFBLK >> S_SHIFT] = F2FS_FT_BLKDEV,
56 [S_IFIFO >> S_SHIFT] = F2FS_FT_FIFO,
57 [S_IFSOCK >> S_SHIFT] = F2FS_FT_SOCK,
58 [S_IFLNK >> S_SHIFT] = F2FS_FT_SYMLINK,
59};
60
61static void set_de_type(struct f2fs_dir_entry *de, struct inode *inode)
62{
63 mode_t mode = inode->i_mode;
64 de->file_type = f2fs_type_by_mode[(mode & S_IFMT) >> S_SHIFT];
65}
66
67static unsigned long dir_block_index(unsigned int level, unsigned int idx)
68{
69 unsigned long i;
70 unsigned long bidx = 0;
71
72 for (i = 0; i < level; i++)
73 bidx += dir_buckets(i) * bucket_blocks(i);
74 bidx += idx * bucket_blocks(level);
75 return bidx;
76}
77
Leon Romanovsky9836b8b2012-12-27 19:55:46 +020078static bool early_match_name(const char *name, size_t namelen,
Jaegeuk Kim6b4ea012012-11-14 16:59:04 +090079 f2fs_hash_t namehash, struct f2fs_dir_entry *de)
80{
81 if (le16_to_cpu(de->name_len) != namelen)
82 return false;
83
Jaegeuk Kim25ca9232012-11-28 16:12:41 +090084 if (de->hash_code != namehash)
Jaegeuk Kim6b4ea012012-11-14 16:59:04 +090085 return false;
86
87 return true;
88}
89
90static struct f2fs_dir_entry *find_in_block(struct page *dentry_page,
Leon Romanovsky9836b8b2012-12-27 19:55:46 +020091 const char *name, size_t namelen, int *max_slots,
Jaegeuk Kim6b4ea012012-11-14 16:59:04 +090092 f2fs_hash_t namehash, struct page **res_page)
93{
94 struct f2fs_dir_entry *de;
95 unsigned long bit_pos, end_pos, next_pos;
96 struct f2fs_dentry_block *dentry_blk = kmap(dentry_page);
97 int slots;
98
99 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
100 NR_DENTRY_IN_BLOCK, 0);
101 while (bit_pos < NR_DENTRY_IN_BLOCK) {
102 de = &dentry_blk->dentry[bit_pos];
Namjae Jeon457d08e2012-12-08 14:54:50 +0900103 slots = GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
Jaegeuk Kim6b4ea012012-11-14 16:59:04 +0900104
105 if (early_match_name(name, namelen, namehash, de)) {
106 if (!memcmp(dentry_blk->filename[bit_pos],
107 name, namelen)) {
108 *res_page = dentry_page;
109 goto found;
110 }
111 }
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;
117 else
118 end_pos = bit_pos;
119 if (*max_slots < end_pos - next_pos)
120 *max_slots = end_pos - next_pos;
121 }
122
123 de = NULL;
124 kunmap(dentry_page);
125found:
126 return de;
127}
128
129static struct f2fs_dir_entry *find_in_level(struct inode *dir,
Leon Romanovsky9836b8b2012-12-27 19:55:46 +0200130 unsigned int level, const char *name, size_t namelen,
Jaegeuk Kim6b4ea012012-11-14 16:59:04 +0900131 f2fs_hash_t namehash, struct page **res_page)
132{
Namjae Jeon457d08e2012-12-08 14:54:50 +0900133 int s = GET_DENTRY_SLOTS(namelen);
Jaegeuk Kim6b4ea012012-11-14 16:59:04 +0900134 unsigned int nbucket, nblock;
135 unsigned int bidx, end_block;
136 struct page *dentry_page;
137 struct f2fs_dir_entry *de = NULL;
138 bool room = false;
139 int max_slots = 0;
140
141 BUG_ON(level > MAX_DIR_HASH_DEPTH);
142
143 nbucket = dir_buckets(level);
144 nblock = bucket_blocks(level);
145
Jaegeuk Kim25ca9232012-11-28 16:12:41 +0900146 bidx = dir_block_index(level, le32_to_cpu(namehash) % nbucket);
Jaegeuk Kim6b4ea012012-11-14 16:59:04 +0900147 end_block = bidx + nblock;
148
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)) {
153 room = true;
154 continue;
155 }
156
157 de = find_in_block(dentry_page, name, namelen,
158 &max_slots, namehash, res_page);
159 if (de)
160 break;
161
162 if (max_slots >= s)
163 room = true;
164 f2fs_put_page(dentry_page, 0);
165 }
166
167 if (!de && room && F2FS_I(dir)->chash != namehash) {
168 F2FS_I(dir)->chash = namehash;
169 F2FS_I(dir)->clevel = level;
170 }
171
172 return de;
173}
174
175/*
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.
180 */
181struct f2fs_dir_entry *f2fs_find_entry(struct inode *dir,
182 struct qstr *child, struct page **res_page)
183{
184 const char *name = child->name;
Leon Romanovsky9836b8b2012-12-27 19:55:46 +0200185 size_t namelen = child->len;
Jaegeuk Kim6b4ea012012-11-14 16:59:04 +0900186 unsigned long npages = dir_blocks(dir);
187 struct f2fs_dir_entry *de = NULL;
188 f2fs_hash_t name_hash;
189 unsigned int max_depth;
190 unsigned int level;
191
192 if (npages == 0)
193 return NULL;
194
195 *res_page = NULL;
196
197 name_hash = f2fs_dentry_hash(name, namelen);
198 max_depth = F2FS_I(dir)->i_current_depth;
199
200 for (level = 0; level < max_depth; level++) {
201 de = find_in_level(dir, level, name,
202 namelen, name_hash, res_page);
203 if (de)
204 break;
205 }
206 if (!de && F2FS_I(dir)->chash != name_hash) {
207 F2FS_I(dir)->chash = name_hash;
208 F2FS_I(dir)->clevel = level - 1;
209 }
210 return de;
211}
212
213struct f2fs_dir_entry *f2fs_parent_dir(struct inode *dir, struct page **p)
214{
215 struct page *page = NULL;
216 struct f2fs_dir_entry *de = NULL;
217 struct f2fs_dentry_block *dentry_blk = NULL;
218
219 page = get_lock_data_page(dir, 0);
220 if (IS_ERR(page))
221 return NULL;
222
223 dentry_blk = kmap(page);
224 de = &dentry_blk->dentry[1];
225 *p = page;
226 unlock_page(page);
227 return de;
228}
229
230ino_t f2fs_inode_by_name(struct inode *dir, struct qstr *qstr)
231{
232 ino_t res = 0;
233 struct f2fs_dir_entry *de;
234 struct page *page;
235
236 de = f2fs_find_entry(dir, qstr, &page);
237 if (de) {
238 res = le32_to_cpu(de->ino);
239 kunmap(page);
240 f2fs_put_page(page, 0);
241 }
242
243 return res;
244}
245
246void f2fs_set_link(struct inode *dir, struct f2fs_dir_entry *de,
247 struct page *page, struct inode *inode)
248{
249 struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
250
251 mutex_lock_op(sbi, DENTRY_OPS);
252 lock_page(page);
253 wait_on_page_writeback(page);
254 de->ino = cpu_to_le32(inode->i_ino);
255 set_de_type(de, inode);
256 kunmap(page);
257 set_page_dirty(page);
258 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
259 mark_inode_dirty(dir);
Jaegeuk Kim6666e6a2012-12-10 17:52:48 +0900260
261 /* update parent inode number before releasing dentry page */
262 F2FS_I(inode)->i_pino = dir->i_ino;
263
Jaegeuk Kim6b4ea012012-11-14 16:59:04 +0900264 f2fs_put_page(page, 1);
265 mutex_unlock_op(sbi, DENTRY_OPS);
266}
267
268void init_dent_inode(struct dentry *dentry, struct page *ipage)
269{
Jaegeuk Kim6b4ea012012-11-14 16:59:04 +0900270 struct f2fs_node *rn;
271
272 if (IS_ERR(ipage))
273 return;
274
275 wait_on_page_writeback(ipage);
276
277 /* copy dentry info. to this inode page */
278 rn = (struct f2fs_node *)page_address(ipage);
Jaegeuk Kim6b4ea012012-11-14 16:59:04 +0900279 rn->i.i_namelen = cpu_to_le32(dentry->d_name.len);
280 memcpy(rn->i.i_name, dentry->d_name.name, dentry->d_name.len);
281 set_page_dirty(ipage);
282}
283
284static int init_inode_metadata(struct inode *inode, struct dentry *dentry)
285{
286 struct inode *dir = dentry->d_parent->d_inode;
287
288 if (is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) {
289 int err;
290 err = new_inode_page(inode, dentry);
291 if (err)
292 return err;
293
294 if (S_ISDIR(inode->i_mode)) {
295 err = f2fs_make_empty(inode, dir);
296 if (err) {
297 remove_inode_page(inode);
298 return err;
299 }
300 }
301
302 err = f2fs_init_acl(inode, dir);
303 if (err) {
304 remove_inode_page(inode);
305 return err;
306 }
307 } else {
308 struct page *ipage;
309 ipage = get_node_page(F2FS_SB(dir->i_sb), inode->i_ino);
310 if (IS_ERR(ipage))
311 return PTR_ERR(ipage);
Jaegeuk Kim398b1ac2012-12-19 15:28:39 +0900312 set_cold_node(inode, ipage);
Jaegeuk Kim6b4ea012012-11-14 16:59:04 +0900313 init_dent_inode(dentry, ipage);
314 f2fs_put_page(ipage, 1);
315 }
316 if (is_inode_flag_set(F2FS_I(inode), FI_INC_LINK)) {
317 inc_nlink(inode);
318 f2fs_write_inode(inode, NULL);
319 }
320 return 0;
321}
322
323static void update_parent_metadata(struct inode *dir, struct inode *inode,
324 unsigned int current_depth)
325{
326 bool need_dir_update = false;
327
328 if (is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) {
329 if (S_ISDIR(inode->i_mode)) {
330 inc_nlink(dir);
331 need_dir_update = true;
332 }
333 clear_inode_flag(F2FS_I(inode), FI_NEW_INODE);
334 }
335 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
336 if (F2FS_I(dir)->i_current_depth != current_depth) {
337 F2FS_I(dir)->i_current_depth = current_depth;
338 need_dir_update = true;
339 }
340
341 if (need_dir_update)
342 f2fs_write_inode(dir, NULL);
343 else
344 mark_inode_dirty(dir);
345
346 if (is_inode_flag_set(F2FS_I(inode), FI_INC_LINK))
347 clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
348}
349
350static int room_for_filename(struct f2fs_dentry_block *dentry_blk, int slots)
351{
352 int bit_start = 0;
353 int zero_start, zero_end;
354next:
355 zero_start = find_next_zero_bit_le(&dentry_blk->dentry_bitmap,
356 NR_DENTRY_IN_BLOCK,
357 bit_start);
358 if (zero_start >= NR_DENTRY_IN_BLOCK)
359 return NR_DENTRY_IN_BLOCK;
360
361 zero_end = find_next_bit_le(&dentry_blk->dentry_bitmap,
362 NR_DENTRY_IN_BLOCK,
363 zero_start);
364 if (zero_end - zero_start >= slots)
365 return zero_start;
366
367 bit_start = zero_end + 1;
368
369 if (zero_end + 1 >= NR_DENTRY_IN_BLOCK)
370 return NR_DENTRY_IN_BLOCK;
371 goto next;
372}
373
374int f2fs_add_link(struct dentry *dentry, struct inode *inode)
375{
376 unsigned int bit_pos;
377 unsigned int level;
378 unsigned int current_depth;
379 unsigned long bidx, block;
380 f2fs_hash_t dentry_hash;
381 struct f2fs_dir_entry *de;
382 unsigned int nbucket, nblock;
383 struct inode *dir = dentry->d_parent->d_inode;
384 struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
385 const char *name = dentry->d_name.name;
Leon Romanovsky9836b8b2012-12-27 19:55:46 +0200386 size_t namelen = dentry->d_name.len;
Jaegeuk Kim6b4ea012012-11-14 16:59:04 +0900387 struct page *dentry_page = NULL;
388 struct f2fs_dentry_block *dentry_blk = NULL;
Namjae Jeon457d08e2012-12-08 14:54:50 +0900389 int slots = GET_DENTRY_SLOTS(namelen);
Jaegeuk Kim6b4ea012012-11-14 16:59:04 +0900390 int err = 0;
391 int i;
392
393 dentry_hash = f2fs_dentry_hash(name, dentry->d_name.len);
394 level = 0;
395 current_depth = F2FS_I(dir)->i_current_depth;
396 if (F2FS_I(dir)->chash == dentry_hash) {
397 level = F2FS_I(dir)->clevel;
398 F2FS_I(dir)->chash = 0;
399 }
400
401start:
402 if (current_depth == MAX_DIR_HASH_DEPTH)
403 return -ENOSPC;
404
405 /* Increase the depth, if required */
406 if (level == current_depth)
407 ++current_depth;
408
409 nbucket = dir_buckets(level);
410 nblock = bucket_blocks(level);
411
Jaegeuk Kim25ca9232012-11-28 16:12:41 +0900412 bidx = dir_block_index(level, (le32_to_cpu(dentry_hash) % nbucket));
Jaegeuk Kim6b4ea012012-11-14 16:59:04 +0900413
414 for (block = bidx; block <= (bidx + nblock - 1); block++) {
415 mutex_lock_op(sbi, DENTRY_OPS);
416 dentry_page = get_new_data_page(dir, block, true);
417 if (IS_ERR(dentry_page)) {
418 mutex_unlock_op(sbi, DENTRY_OPS);
419 return PTR_ERR(dentry_page);
420 }
421
422 dentry_blk = kmap(dentry_page);
423 bit_pos = room_for_filename(dentry_blk, slots);
424 if (bit_pos < NR_DENTRY_IN_BLOCK)
425 goto add_dentry;
426
427 kunmap(dentry_page);
428 f2fs_put_page(dentry_page, 1);
429 mutex_unlock_op(sbi, DENTRY_OPS);
430 }
431
432 /* Move to next level to find the empty slot for new dentry */
433 ++level;
434 goto start;
435add_dentry:
436 err = init_inode_metadata(inode, dentry);
437 if (err)
438 goto fail;
439
440 wait_on_page_writeback(dentry_page);
441
442 de = &dentry_blk->dentry[bit_pos];
Jaegeuk Kim25ca9232012-11-28 16:12:41 +0900443 de->hash_code = dentry_hash;
Jaegeuk Kim6b4ea012012-11-14 16:59:04 +0900444 de->name_len = cpu_to_le16(namelen);
445 memcpy(dentry_blk->filename[bit_pos], name, namelen);
446 de->ino = cpu_to_le32(inode->i_ino);
447 set_de_type(de, inode);
448 for (i = 0; i < slots; i++)
449 test_and_set_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap);
450 set_page_dirty(dentry_page);
Jaegeuk Kim6666e6a2012-12-10 17:52:48 +0900451
Jaegeuk Kim6b4ea012012-11-14 16:59:04 +0900452 update_parent_metadata(dir, inode, current_depth);
Jaegeuk Kim6666e6a2012-12-10 17:52:48 +0900453
454 /* update parent inode number before releasing dentry page */
455 F2FS_I(inode)->i_pino = dir->i_ino;
Jaegeuk Kim6b4ea012012-11-14 16:59:04 +0900456fail:
457 kunmap(dentry_page);
458 f2fs_put_page(dentry_page, 1);
459 mutex_unlock_op(sbi, DENTRY_OPS);
460 return err;
461}
462
Jaegeuk Kim0a8165d2012-11-29 13:28:09 +0900463/*
Jaegeuk Kim6b4ea012012-11-14 16:59:04 +0900464 * It only removes the dentry from the dentry page,corresponding name
465 * entry in name page does not need to be touched during deletion.
466 */
467void f2fs_delete_entry(struct f2fs_dir_entry *dentry, struct page *page,
468 struct inode *inode)
469{
470 struct f2fs_dentry_block *dentry_blk;
471 unsigned int bit_pos;
472 struct address_space *mapping = page->mapping;
473 struct inode *dir = mapping->host;
474 struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
Namjae Jeon457d08e2012-12-08 14:54:50 +0900475 int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len));
Jaegeuk Kim6b4ea012012-11-14 16:59:04 +0900476 void *kaddr = page_address(page);
477 int i;
478
479 mutex_lock_op(sbi, DENTRY_OPS);
480
481 lock_page(page);
482 wait_on_page_writeback(page);
483
484 dentry_blk = (struct f2fs_dentry_block *)kaddr;
485 bit_pos = dentry - (struct f2fs_dir_entry *)dentry_blk->dentry;
486 for (i = 0; i < slots; i++)
487 test_and_clear_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap);
488
489 /* Let's check and deallocate this dentry page */
490 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
491 NR_DENTRY_IN_BLOCK,
492 0);
493 kunmap(page); /* kunmap - pair of f2fs_find_entry */
494 set_page_dirty(page);
495
496 dir->i_ctime = dir->i_mtime = CURRENT_TIME;
497
498 if (inode && S_ISDIR(inode->i_mode)) {
499 drop_nlink(dir);
500 f2fs_write_inode(dir, NULL);
501 } else {
502 mark_inode_dirty(dir);
503 }
504
505 if (inode) {
506 inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME;
507 drop_nlink(inode);
508 if (S_ISDIR(inode->i_mode)) {
509 drop_nlink(inode);
510 i_size_write(inode, 0);
511 }
512 f2fs_write_inode(inode, NULL);
513 if (inode->i_nlink == 0)
514 add_orphan_inode(sbi, inode->i_ino);
515 }
516
517 if (bit_pos == NR_DENTRY_IN_BLOCK) {
Jaegeuk Kim6b4ea012012-11-14 16:59:04 +0900518 truncate_hole(dir, page->index, page->index + 1);
519 clear_page_dirty_for_io(page);
520 ClearPageUptodate(page);
521 dec_page_count(sbi, F2FS_DIRTY_DENTS);
522 inode_dec_dirty_dents(dir);
Jaegeuk Kim6b4ea012012-11-14 16:59:04 +0900523 }
Namjae Jeon508198b2012-12-08 14:54:35 +0900524 f2fs_put_page(page, 1);
525
Jaegeuk Kim6b4ea012012-11-14 16:59:04 +0900526 mutex_unlock_op(sbi, DENTRY_OPS);
527}
528
529int f2fs_make_empty(struct inode *inode, struct inode *parent)
530{
531 struct page *dentry_page;
532 struct f2fs_dentry_block *dentry_blk;
533 struct f2fs_dir_entry *de;
534 void *kaddr;
535
536 dentry_page = get_new_data_page(inode, 0, true);
537 if (IS_ERR(dentry_page))
538 return PTR_ERR(dentry_page);
539
540 kaddr = kmap_atomic(dentry_page);
541 dentry_blk = (struct f2fs_dentry_block *)kaddr;
542
543 de = &dentry_blk->dentry[0];
544 de->name_len = cpu_to_le16(1);
Namjae Jeon38e0abd2012-12-13 23:44:11 +0900545 de->hash_code = f2fs_dentry_hash(".", 1);
Jaegeuk Kim6b4ea012012-11-14 16:59:04 +0900546 de->ino = cpu_to_le32(inode->i_ino);
547 memcpy(dentry_blk->filename[0], ".", 1);
548 set_de_type(de, inode);
549
550 de = &dentry_blk->dentry[1];
Namjae Jeon38e0abd2012-12-13 23:44:11 +0900551 de->hash_code = f2fs_dentry_hash("..", 2);
Jaegeuk Kim6b4ea012012-11-14 16:59:04 +0900552 de->name_len = cpu_to_le16(2);
553 de->ino = cpu_to_le32(parent->i_ino);
554 memcpy(dentry_blk->filename[1], "..", 2);
555 set_de_type(de, inode);
556
557 test_and_set_bit_le(0, &dentry_blk->dentry_bitmap);
558 test_and_set_bit_le(1, &dentry_blk->dentry_bitmap);
559 kunmap_atomic(kaddr);
560
561 set_page_dirty(dentry_page);
562 f2fs_put_page(dentry_page, 1);
563 return 0;
564}
565
566bool f2fs_empty_dir(struct inode *dir)
567{
568 unsigned long bidx;
569 struct page *dentry_page;
570 unsigned int bit_pos;
571 struct f2fs_dentry_block *dentry_blk;
572 unsigned long nblock = dir_blocks(dir);
573
574 for (bidx = 0; bidx < nblock; bidx++) {
575 void *kaddr;
576 dentry_page = get_lock_data_page(dir, bidx);
577 if (IS_ERR(dentry_page)) {
578 if (PTR_ERR(dentry_page) == -ENOENT)
579 continue;
580 else
581 return false;
582 }
583
584 kaddr = kmap_atomic(dentry_page);
585 dentry_blk = (struct f2fs_dentry_block *)kaddr;
586 if (bidx == 0)
587 bit_pos = 2;
588 else
589 bit_pos = 0;
590 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
591 NR_DENTRY_IN_BLOCK,
592 bit_pos);
593 kunmap_atomic(kaddr);
594
595 f2fs_put_page(dentry_page, 1);
596
597 if (bit_pos < NR_DENTRY_IN_BLOCK)
598 return false;
599 }
600 return true;
601}
602
603static int f2fs_readdir(struct file *file, void *dirent, filldir_t filldir)
604{
605 unsigned long pos = file->f_pos;
606 struct inode *inode = file->f_dentry->d_inode;
607 unsigned long npages = dir_blocks(inode);
608 unsigned char *types = NULL;
609 unsigned int bit_pos = 0, start_bit_pos = 0;
610 int over = 0;
611 struct f2fs_dentry_block *dentry_blk = NULL;
612 struct f2fs_dir_entry *de = NULL;
613 struct page *dentry_page = NULL;
614 unsigned int n = 0;
615 unsigned char d_type = DT_UNKNOWN;
616 int slots;
617
618 types = f2fs_filetype_table;
619 bit_pos = (pos % NR_DENTRY_IN_BLOCK);
620 n = (pos / NR_DENTRY_IN_BLOCK);
621
622 for ( ; n < npages; n++) {
623 dentry_page = get_lock_data_page(inode, n);
624 if (IS_ERR(dentry_page))
625 continue;
626
627 start_bit_pos = bit_pos;
628 dentry_blk = kmap(dentry_page);
629 while (bit_pos < NR_DENTRY_IN_BLOCK) {
630 d_type = DT_UNKNOWN;
631 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
632 NR_DENTRY_IN_BLOCK,
633 bit_pos);
634 if (bit_pos >= NR_DENTRY_IN_BLOCK)
635 break;
636
637 de = &dentry_blk->dentry[bit_pos];
638 if (types && de->file_type < F2FS_FT_MAX)
639 d_type = types[de->file_type];
640
641 over = filldir(dirent,
642 dentry_blk->filename[bit_pos],
643 le16_to_cpu(de->name_len),
644 (n * NR_DENTRY_IN_BLOCK) + bit_pos,
645 le32_to_cpu(de->ino), d_type);
646 if (over) {
647 file->f_pos += bit_pos - start_bit_pos;
648 goto success;
649 }
Namjae Jeon457d08e2012-12-08 14:54:50 +0900650 slots = GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
Jaegeuk Kim6b4ea012012-11-14 16:59:04 +0900651 bit_pos += slots;
652 }
653 bit_pos = 0;
654 file->f_pos = (n + 1) * NR_DENTRY_IN_BLOCK;
655 kunmap(dentry_page);
656 f2fs_put_page(dentry_page, 1);
657 dentry_page = NULL;
658 }
659success:
660 if (dentry_page && !IS_ERR(dentry_page)) {
661 kunmap(dentry_page);
662 f2fs_put_page(dentry_page, 1);
663 }
664
665 return 0;
666}
667
668const struct file_operations f2fs_dir_operations = {
669 .llseek = generic_file_llseek,
670 .read = generic_read_dir,
671 .readdir = f2fs_readdir,
672 .fsync = f2fs_sync_file,
673 .unlocked_ioctl = f2fs_ioctl,
674};