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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid
[deliverable/linux.git] / fs / f2fs / dir.c
1 /*
2 * 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"
14 #include "node.h"
15 #include "acl.h"
16 #include "xattr.h"
17
18 static unsigned long dir_blocks(struct inode *inode)
19 {
20 return ((unsigned long long) (i_size_read(inode) + PAGE_CACHE_SIZE - 1))
21 >> PAGE_CACHE_SHIFT;
22 }
23
24 static unsigned int dir_buckets(unsigned int level)
25 {
26 if (level < MAX_DIR_HASH_DEPTH / 2)
27 return 1 << level;
28 else
29 return 1 << ((MAX_DIR_HASH_DEPTH / 2) - 1);
30 }
31
32 static unsigned int bucket_blocks(unsigned int level)
33 {
34 if (level < MAX_DIR_HASH_DEPTH / 2)
35 return 2;
36 else
37 return 4;
38 }
39
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,
49 };
50
51 #define S_SHIFT 12
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,
60 };
61
62 static void set_de_type(struct f2fs_dir_entry *de, struct inode *inode)
63 {
64 umode_t mode = inode->i_mode;
65 de->file_type = f2fs_type_by_mode[(mode & S_IFMT) >> S_SHIFT];
66 }
67
68 static unsigned long dir_block_index(unsigned int level, unsigned int idx)
69 {
70 unsigned long i;
71 unsigned long bidx = 0;
72
73 for (i = 0; i < level; i++)
74 bidx += dir_buckets(i) * bucket_blocks(i);
75 bidx += idx * bucket_blocks(level);
76 return bidx;
77 }
78
79 static bool early_match_name(const char *name, size_t namelen,
80 f2fs_hash_t namehash, struct f2fs_dir_entry *de)
81 {
82 if (le16_to_cpu(de->name_len) != namelen)
83 return false;
84
85 if (de->hash_code != namehash)
86 return false;
87
88 return true;
89 }
90
91 static struct f2fs_dir_entry *find_in_block(struct page *dentry_page,
92 const char *name, size_t namelen, int *max_slots,
93 f2fs_hash_t namehash, struct page **res_page)
94 {
95 struct f2fs_dir_entry *de;
96 unsigned long bit_pos, end_pos, next_pos;
97 struct f2fs_dentry_block *dentry_blk = kmap(dentry_page);
98 int slots;
99
100 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
101 NR_DENTRY_IN_BLOCK, 0);
102 while (bit_pos < NR_DENTRY_IN_BLOCK) {
103 de = &dentry_blk->dentry[bit_pos];
104 slots = GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
105
106 if (early_match_name(name, namelen, namehash, de)) {
107 if (!memcmp(dentry_blk->filename[bit_pos],
108 name, namelen)) {
109 *res_page = dentry_page;
110 goto found;
111 }
112 }
113 next_pos = bit_pos + slots;
114 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
115 NR_DENTRY_IN_BLOCK, next_pos);
116 if (bit_pos >= NR_DENTRY_IN_BLOCK)
117 end_pos = NR_DENTRY_IN_BLOCK;
118 else
119 end_pos = bit_pos;
120 if (*max_slots < end_pos - next_pos)
121 *max_slots = end_pos - next_pos;
122 }
123
124 de = NULL;
125 kunmap(dentry_page);
126 found:
127 return de;
128 }
129
130 static struct f2fs_dir_entry *find_in_level(struct inode *dir,
131 unsigned int level, const char *name, size_t namelen,
132 f2fs_hash_t namehash, struct page **res_page)
133 {
134 int s = GET_DENTRY_SLOTS(namelen);
135 unsigned int nbucket, nblock;
136 unsigned int bidx, end_block;
137 struct page *dentry_page;
138 struct f2fs_dir_entry *de = NULL;
139 bool room = false;
140 int max_slots = 0;
141
142 f2fs_bug_on(level > MAX_DIR_HASH_DEPTH);
143
144 nbucket = dir_buckets(level);
145 nblock = bucket_blocks(level);
146
147 bidx = dir_block_index(level, le32_to_cpu(namehash) % nbucket);
148 end_block = bidx + nblock;
149
150 for (; bidx < end_block; bidx++) {
151 /* no need to allocate new dentry pages to all the indices */
152 dentry_page = find_data_page(dir, bidx, true);
153 if (IS_ERR(dentry_page)) {
154 room = true;
155 continue;
156 }
157
158 de = find_in_block(dentry_page, name, namelen,
159 &max_slots, namehash, res_page);
160 if (de)
161 break;
162
163 if (max_slots >= s)
164 room = true;
165 f2fs_put_page(dentry_page, 0);
166 }
167
168 if (!de && room && F2FS_I(dir)->chash != namehash) {
169 F2FS_I(dir)->chash = namehash;
170 F2FS_I(dir)->clevel = level;
171 }
172
173 return de;
174 }
175
176 /*
177 * Find an entry in the specified directory with the wanted name.
178 * It returns the page where the entry was found (as a parameter - res_page),
179 * and the entry itself. Page is returned mapped and unlocked.
180 * Entry is guaranteed to be valid.
181 */
182 struct f2fs_dir_entry *f2fs_find_entry(struct inode *dir,
183 struct qstr *child, struct page **res_page)
184 {
185 const char *name = child->name;
186 size_t namelen = child->len;
187 unsigned long npages = dir_blocks(dir);
188 struct f2fs_dir_entry *de = NULL;
189 f2fs_hash_t name_hash;
190 unsigned int max_depth;
191 unsigned int level;
192
193 if (npages == 0)
194 return NULL;
195
196 *res_page = NULL;
197
198 name_hash = f2fs_dentry_hash(name, namelen);
199 max_depth = F2FS_I(dir)->i_current_depth;
200
201 for (level = 0; level < max_depth; level++) {
202 de = find_in_level(dir, level, name,
203 namelen, name_hash, res_page);
204 if (de)
205 break;
206 }
207 if (!de && F2FS_I(dir)->chash != name_hash) {
208 F2FS_I(dir)->chash = name_hash;
209 F2FS_I(dir)->clevel = level - 1;
210 }
211 return de;
212 }
213
214 struct f2fs_dir_entry *f2fs_parent_dir(struct inode *dir, struct page **p)
215 {
216 struct page *page;
217 struct f2fs_dir_entry *de;
218 struct f2fs_dentry_block *dentry_blk;
219
220 page = get_lock_data_page(dir, 0);
221 if (IS_ERR(page))
222 return NULL;
223
224 dentry_blk = kmap(page);
225 de = &dentry_blk->dentry[1];
226 *p = page;
227 unlock_page(page);
228 return de;
229 }
230
231 ino_t f2fs_inode_by_name(struct inode *dir, struct qstr *qstr)
232 {
233 ino_t res = 0;
234 struct f2fs_dir_entry *de;
235 struct page *page;
236
237 de = f2fs_find_entry(dir, qstr, &page);
238 if (de) {
239 res = le32_to_cpu(de->ino);
240 kunmap(page);
241 f2fs_put_page(page, 0);
242 }
243
244 return res;
245 }
246
247 void f2fs_set_link(struct inode *dir, struct f2fs_dir_entry *de,
248 struct page *page, struct inode *inode)
249 {
250 lock_page(page);
251 wait_on_page_writeback(page);
252 de->ino = cpu_to_le32(inode->i_ino);
253 set_de_type(de, inode);
254 kunmap(page);
255 set_page_dirty(page);
256 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
257 mark_inode_dirty(dir);
258
259 f2fs_put_page(page, 1);
260 }
261
262 static void init_dent_inode(const struct qstr *name, struct page *ipage)
263 {
264 struct f2fs_inode *ri;
265
266 /* copy name info. to this inode page */
267 ri = F2FS_INODE(ipage);
268 ri->i_namelen = cpu_to_le32(name->len);
269 memcpy(ri->i_name, name->name, name->len);
270 set_page_dirty(ipage);
271 }
272
273 int update_dent_inode(struct inode *inode, const struct qstr *name)
274 {
275 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
276 struct page *page;
277
278 page = get_node_page(sbi, inode->i_ino);
279 if (IS_ERR(page))
280 return PTR_ERR(page);
281
282 init_dent_inode(name, page);
283 f2fs_put_page(page, 1);
284
285 return 0;
286 }
287
288 static int make_empty_dir(struct inode *inode,
289 struct inode *parent, struct page *page)
290 {
291 struct page *dentry_page;
292 struct f2fs_dentry_block *dentry_blk;
293 struct f2fs_dir_entry *de;
294 void *kaddr;
295
296 dentry_page = get_new_data_page(inode, page, 0, true);
297 if (IS_ERR(dentry_page))
298 return PTR_ERR(dentry_page);
299
300 kaddr = kmap_atomic(dentry_page);
301 dentry_blk = (struct f2fs_dentry_block *)kaddr;
302
303 de = &dentry_blk->dentry[0];
304 de->name_len = cpu_to_le16(1);
305 de->hash_code = 0;
306 de->ino = cpu_to_le32(inode->i_ino);
307 memcpy(dentry_blk->filename[0], ".", 1);
308 set_de_type(de, inode);
309
310 de = &dentry_blk->dentry[1];
311 de->hash_code = 0;
312 de->name_len = cpu_to_le16(2);
313 de->ino = cpu_to_le32(parent->i_ino);
314 memcpy(dentry_blk->filename[1], "..", 2);
315 set_de_type(de, inode);
316
317 test_and_set_bit_le(0, &dentry_blk->dentry_bitmap);
318 test_and_set_bit_le(1, &dentry_blk->dentry_bitmap);
319 kunmap_atomic(kaddr);
320
321 set_page_dirty(dentry_page);
322 f2fs_put_page(dentry_page, 1);
323 return 0;
324 }
325
326 static struct page *init_inode_metadata(struct inode *inode,
327 struct inode *dir, const struct qstr *name)
328 {
329 struct page *page;
330 int err;
331
332 if (is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) {
333 page = new_inode_page(inode, name);
334 if (IS_ERR(page))
335 return page;
336
337 if (S_ISDIR(inode->i_mode)) {
338 err = make_empty_dir(inode, dir, page);
339 if (err)
340 goto error;
341 }
342
343 err = f2fs_init_acl(inode, dir, page);
344 if (err)
345 goto put_error;
346
347 err = f2fs_init_security(inode, dir, name, page);
348 if (err)
349 goto put_error;
350
351 wait_on_page_writeback(page);
352 } else {
353 page = get_node_page(F2FS_SB(dir->i_sb), inode->i_ino);
354 if (IS_ERR(page))
355 return page;
356
357 wait_on_page_writeback(page);
358 set_cold_node(inode, page);
359 }
360
361 init_dent_inode(name, page);
362
363 /*
364 * This file should be checkpointed during fsync.
365 * We lost i_pino from now on.
366 */
367 if (is_inode_flag_set(F2FS_I(inode), FI_INC_LINK)) {
368 file_lost_pino(inode);
369 inc_nlink(inode);
370 }
371 return page;
372
373 put_error:
374 f2fs_put_page(page, 1);
375 error:
376 remove_inode_page(inode);
377 return ERR_PTR(err);
378 }
379
380 static void update_parent_metadata(struct inode *dir, struct inode *inode,
381 unsigned int current_depth)
382 {
383 if (is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) {
384 if (S_ISDIR(inode->i_mode)) {
385 inc_nlink(dir);
386 set_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
387 }
388 clear_inode_flag(F2FS_I(inode), FI_NEW_INODE);
389 }
390 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
391 mark_inode_dirty(dir);
392
393 if (F2FS_I(dir)->i_current_depth != current_depth) {
394 F2FS_I(dir)->i_current_depth = current_depth;
395 set_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
396 }
397
398 if (is_inode_flag_set(F2FS_I(dir), FI_UPDATE_DIR))
399 update_inode_page(dir);
400
401 if (is_inode_flag_set(F2FS_I(inode), FI_INC_LINK))
402 clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
403 }
404
405 static int room_for_filename(struct f2fs_dentry_block *dentry_blk, int slots)
406 {
407 int bit_start = 0;
408 int zero_start, zero_end;
409 next:
410 zero_start = find_next_zero_bit_le(&dentry_blk->dentry_bitmap,
411 NR_DENTRY_IN_BLOCK,
412 bit_start);
413 if (zero_start >= NR_DENTRY_IN_BLOCK)
414 return NR_DENTRY_IN_BLOCK;
415
416 zero_end = find_next_bit_le(&dentry_blk->dentry_bitmap,
417 NR_DENTRY_IN_BLOCK,
418 zero_start);
419 if (zero_end - zero_start >= slots)
420 return zero_start;
421
422 bit_start = zero_end + 1;
423
424 if (zero_end + 1 >= NR_DENTRY_IN_BLOCK)
425 return NR_DENTRY_IN_BLOCK;
426 goto next;
427 }
428
429 /*
430 * Caller should grab and release a rwsem by calling f2fs_lock_op() and
431 * f2fs_unlock_op().
432 */
433 int __f2fs_add_link(struct inode *dir, const struct qstr *name,
434 struct inode *inode)
435 {
436 unsigned int bit_pos;
437 unsigned int level;
438 unsigned int current_depth;
439 unsigned long bidx, block;
440 f2fs_hash_t dentry_hash;
441 struct f2fs_dir_entry *de;
442 unsigned int nbucket, nblock;
443 size_t namelen = name->len;
444 struct page *dentry_page = NULL;
445 struct f2fs_dentry_block *dentry_blk = NULL;
446 int slots = GET_DENTRY_SLOTS(namelen);
447 struct page *page;
448 int err = 0;
449 int i;
450
451 dentry_hash = f2fs_dentry_hash(name->name, name->len);
452 level = 0;
453 current_depth = F2FS_I(dir)->i_current_depth;
454 if (F2FS_I(dir)->chash == dentry_hash) {
455 level = F2FS_I(dir)->clevel;
456 F2FS_I(dir)->chash = 0;
457 }
458
459 start:
460 if (unlikely(current_depth == MAX_DIR_HASH_DEPTH))
461 return -ENOSPC;
462
463 /* Increase the depth, if required */
464 if (level == current_depth)
465 ++current_depth;
466
467 nbucket = dir_buckets(level);
468 nblock = bucket_blocks(level);
469
470 bidx = dir_block_index(level, (le32_to_cpu(dentry_hash) % nbucket));
471
472 for (block = bidx; block <= (bidx + nblock - 1); block++) {
473 dentry_page = get_new_data_page(dir, NULL, block, true);
474 if (IS_ERR(dentry_page))
475 return PTR_ERR(dentry_page);
476
477 dentry_blk = kmap(dentry_page);
478 bit_pos = room_for_filename(dentry_blk, slots);
479 if (bit_pos < NR_DENTRY_IN_BLOCK)
480 goto add_dentry;
481
482 kunmap(dentry_page);
483 f2fs_put_page(dentry_page, 1);
484 }
485
486 /* Move to next level to find the empty slot for new dentry */
487 ++level;
488 goto start;
489 add_dentry:
490 wait_on_page_writeback(dentry_page);
491
492 page = init_inode_metadata(inode, dir, name);
493 if (IS_ERR(page)) {
494 err = PTR_ERR(page);
495 goto fail;
496 }
497 de = &dentry_blk->dentry[bit_pos];
498 de->hash_code = dentry_hash;
499 de->name_len = cpu_to_le16(namelen);
500 memcpy(dentry_blk->filename[bit_pos], name->name, name->len);
501 de->ino = cpu_to_le32(inode->i_ino);
502 set_de_type(de, inode);
503 for (i = 0; i < slots; i++)
504 test_and_set_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap);
505 set_page_dirty(dentry_page);
506
507 /* we don't need to mark_inode_dirty now */
508 F2FS_I(inode)->i_pino = dir->i_ino;
509 update_inode(inode, page);
510 f2fs_put_page(page, 1);
511
512 update_parent_metadata(dir, inode, current_depth);
513 fail:
514 clear_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
515 kunmap(dentry_page);
516 f2fs_put_page(dentry_page, 1);
517 return err;
518 }
519
520 /*
521 * It only removes the dentry from the dentry page,corresponding name
522 * entry in name page does not need to be touched during deletion.
523 */
524 void f2fs_delete_entry(struct f2fs_dir_entry *dentry, struct page *page,
525 struct inode *inode)
526 {
527 struct f2fs_dentry_block *dentry_blk;
528 unsigned int bit_pos;
529 struct address_space *mapping = page->mapping;
530 struct inode *dir = mapping->host;
531 struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
532 int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len));
533 void *kaddr = page_address(page);
534 int i;
535
536 lock_page(page);
537 wait_on_page_writeback(page);
538
539 dentry_blk = (struct f2fs_dentry_block *)kaddr;
540 bit_pos = dentry - (struct f2fs_dir_entry *)dentry_blk->dentry;
541 for (i = 0; i < slots; i++)
542 test_and_clear_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap);
543
544 /* Let's check and deallocate this dentry page */
545 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
546 NR_DENTRY_IN_BLOCK,
547 0);
548 kunmap(page); /* kunmap - pair of f2fs_find_entry */
549 set_page_dirty(page);
550
551 dir->i_ctime = dir->i_mtime = CURRENT_TIME;
552
553 if (inode) {
554 if (S_ISDIR(inode->i_mode)) {
555 drop_nlink(dir);
556 update_inode_page(dir);
557 }
558 inode->i_ctime = CURRENT_TIME;
559 drop_nlink(inode);
560 if (S_ISDIR(inode->i_mode)) {
561 drop_nlink(inode);
562 i_size_write(inode, 0);
563 }
564 update_inode_page(inode);
565
566 if (inode->i_nlink == 0)
567 add_orphan_inode(sbi, inode->i_ino);
568 else
569 release_orphan_inode(sbi);
570 }
571
572 if (bit_pos == NR_DENTRY_IN_BLOCK) {
573 truncate_hole(dir, page->index, page->index + 1);
574 clear_page_dirty_for_io(page);
575 ClearPageUptodate(page);
576 dec_page_count(sbi, F2FS_DIRTY_DENTS);
577 inode_dec_dirty_dents(dir);
578 }
579 f2fs_put_page(page, 1);
580 }
581
582 bool f2fs_empty_dir(struct inode *dir)
583 {
584 unsigned long bidx;
585 struct page *dentry_page;
586 unsigned int bit_pos;
587 struct f2fs_dentry_block *dentry_blk;
588 unsigned long nblock = dir_blocks(dir);
589
590 for (bidx = 0; bidx < nblock; bidx++) {
591 void *kaddr;
592 dentry_page = get_lock_data_page(dir, bidx);
593 if (IS_ERR(dentry_page)) {
594 if (PTR_ERR(dentry_page) == -ENOENT)
595 continue;
596 else
597 return false;
598 }
599
600 kaddr = kmap_atomic(dentry_page);
601 dentry_blk = (struct f2fs_dentry_block *)kaddr;
602 if (bidx == 0)
603 bit_pos = 2;
604 else
605 bit_pos = 0;
606 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
607 NR_DENTRY_IN_BLOCK,
608 bit_pos);
609 kunmap_atomic(kaddr);
610
611 f2fs_put_page(dentry_page, 1);
612
613 if (bit_pos < NR_DENTRY_IN_BLOCK)
614 return false;
615 }
616 return true;
617 }
618
619 static int f2fs_readdir(struct file *file, struct dir_context *ctx)
620 {
621 struct inode *inode = file_inode(file);
622 unsigned long npages = dir_blocks(inode);
623 unsigned int bit_pos = 0;
624 struct f2fs_dentry_block *dentry_blk = NULL;
625 struct f2fs_dir_entry *de = NULL;
626 struct page *dentry_page = NULL;
627 unsigned int n = ((unsigned long)ctx->pos / NR_DENTRY_IN_BLOCK);
628 unsigned char d_type = DT_UNKNOWN;
629
630 bit_pos = ((unsigned long)ctx->pos % NR_DENTRY_IN_BLOCK);
631
632 for (; n < npages; n++) {
633 dentry_page = get_lock_data_page(inode, n);
634 if (IS_ERR(dentry_page))
635 continue;
636
637 dentry_blk = kmap(dentry_page);
638 while (bit_pos < NR_DENTRY_IN_BLOCK) {
639 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
640 NR_DENTRY_IN_BLOCK,
641 bit_pos);
642 if (bit_pos >= NR_DENTRY_IN_BLOCK)
643 break;
644
645 de = &dentry_blk->dentry[bit_pos];
646 if (de->file_type < F2FS_FT_MAX)
647 d_type = f2fs_filetype_table[de->file_type];
648 else
649 d_type = DT_UNKNOWN;
650 if (!dir_emit(ctx,
651 dentry_blk->filename[bit_pos],
652 le16_to_cpu(de->name_len),
653 le32_to_cpu(de->ino), d_type))
654 goto stop;
655
656 bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
657 ctx->pos = n * NR_DENTRY_IN_BLOCK + bit_pos;
658 }
659 bit_pos = 0;
660 ctx->pos = (n + 1) * NR_DENTRY_IN_BLOCK;
661 kunmap(dentry_page);
662 f2fs_put_page(dentry_page, 1);
663 dentry_page = NULL;
664 }
665 stop:
666 if (dentry_page && !IS_ERR(dentry_page)) {
667 kunmap(dentry_page);
668 f2fs_put_page(dentry_page, 1);
669 }
670
671 return 0;
672 }
673
674 const struct file_operations f2fs_dir_operations = {
675 .llseek = generic_file_llseek,
676 .read = generic_read_dir,
677 .iterate = f2fs_readdir,
678 .fsync = f2fs_sync_file,
679 .unlocked_ioctl = f2fs_ioctl,
680 };
Linux kernel - Deliverables
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