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Merge remote-tracking branch 'mmc-uh/next'
[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_SIZE - 1))
21 >> PAGE_SHIFT;
22 }
23
24 static unsigned int dir_buckets(unsigned int level, int dir_level)
25 {
26 if (level + dir_level < MAX_DIR_HASH_DEPTH / 2)
27 return 1 << (level + dir_level);
28 else
29 return MAX_DIR_BUCKETS;
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 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 static 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
61 void set_de_type(struct f2fs_dir_entry *de, umode_t mode)
62 {
63 de->file_type = f2fs_type_by_mode[(mode & S_IFMT) >> S_SHIFT];
64 }
65
66 unsigned char get_de_type(struct f2fs_dir_entry *de)
67 {
68 if (de->file_type < F2FS_FT_MAX)
69 return f2fs_filetype_table[de->file_type];
70 return DT_UNKNOWN;
71 }
72
73 static unsigned long dir_block_index(unsigned int level,
74 int dir_level, unsigned int idx)
75 {
76 unsigned long i;
77 unsigned long bidx = 0;
78
79 for (i = 0; i < level; i++)
80 bidx += dir_buckets(i, dir_level) * bucket_blocks(i);
81 bidx += idx * bucket_blocks(level);
82 return bidx;
83 }
84
85 static struct f2fs_dir_entry *find_in_block(struct page *dentry_page,
86 struct fscrypt_name *fname,
87 f2fs_hash_t namehash,
88 int *max_slots,
89 struct page **res_page)
90 {
91 struct f2fs_dentry_block *dentry_blk;
92 struct f2fs_dir_entry *de;
93 struct f2fs_dentry_ptr d;
94
95 dentry_blk = (struct f2fs_dentry_block *)kmap(dentry_page);
96
97 make_dentry_ptr(NULL, &d, (void *)dentry_blk, 1);
98 de = find_target_dentry(fname, namehash, max_slots, &d);
99 if (de)
100 *res_page = dentry_page;
101 else
102 kunmap(dentry_page);
103
104 return de;
105 }
106
107 struct f2fs_dir_entry *find_target_dentry(struct fscrypt_name *fname,
108 f2fs_hash_t namehash, int *max_slots,
109 struct f2fs_dentry_ptr *d)
110 {
111 struct f2fs_dir_entry *de;
112 unsigned long bit_pos = 0;
113 int max_len = 0;
114 struct fscrypt_str de_name = FSTR_INIT(NULL, 0);
115 struct fscrypt_str *name = &fname->disk_name;
116
117 if (max_slots)
118 *max_slots = 0;
119 while (bit_pos < d->max) {
120 if (!test_bit_le(bit_pos, d->bitmap)) {
121 bit_pos++;
122 max_len++;
123 continue;
124 }
125
126 de = &d->dentry[bit_pos];
127
128 if (unlikely(!de->name_len)) {
129 bit_pos++;
130 continue;
131 }
132
133 /* encrypted case */
134 de_name.name = d->filename[bit_pos];
135 de_name.len = le16_to_cpu(de->name_len);
136
137 /* show encrypted name */
138 if (fname->hash) {
139 if (de->hash_code == fname->hash)
140 goto found;
141 } else if (de_name.len == name->len &&
142 de->hash_code == namehash &&
143 !memcmp(de_name.name, name->name, name->len))
144 goto found;
145
146 if (max_slots && max_len > *max_slots)
147 *max_slots = max_len;
148 max_len = 0;
149
150 bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
151 }
152
153 de = NULL;
154 found:
155 if (max_slots && max_len > *max_slots)
156 *max_slots = max_len;
157 return de;
158 }
159
160 static struct f2fs_dir_entry *find_in_level(struct inode *dir,
161 unsigned int level,
162 struct fscrypt_name *fname,
163 struct page **res_page)
164 {
165 struct qstr name = FSTR_TO_QSTR(&fname->disk_name);
166 int s = GET_DENTRY_SLOTS(name.len);
167 unsigned int nbucket, nblock;
168 unsigned int bidx, end_block;
169 struct page *dentry_page;
170 struct f2fs_dir_entry *de = NULL;
171 bool room = false;
172 int max_slots;
173 f2fs_hash_t namehash;
174
175 if(fname->hash)
176 namehash = cpu_to_le32(fname->hash);
177 else
178 namehash = f2fs_dentry_hash(&name);
179
180 nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level);
181 nblock = bucket_blocks(level);
182
183 bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level,
184 le32_to_cpu(namehash) % nbucket);
185 end_block = bidx + nblock;
186
187 for (; bidx < end_block; bidx++) {
188 /* no need to allocate new dentry pages to all the indices */
189 dentry_page = find_data_page(dir, bidx);
190 if (IS_ERR(dentry_page)) {
191 if (PTR_ERR(dentry_page) == -ENOENT) {
192 room = true;
193 continue;
194 } else {
195 *res_page = dentry_page;
196 break;
197 }
198 }
199
200 de = find_in_block(dentry_page, fname, namehash, &max_slots,
201 res_page);
202 if (de)
203 break;
204
205 if (max_slots >= s)
206 room = true;
207 f2fs_put_page(dentry_page, 0);
208 }
209
210 if (!de && room && F2FS_I(dir)->chash != namehash) {
211 F2FS_I(dir)->chash = namehash;
212 F2FS_I(dir)->clevel = level;
213 }
214
215 return de;
216 }
217
218 struct f2fs_dir_entry *__f2fs_find_entry(struct inode *dir,
219 struct fscrypt_name *fname, struct page **res_page)
220 {
221 unsigned long npages = dir_blocks(dir);
222 struct f2fs_dir_entry *de = NULL;
223 unsigned int max_depth;
224 unsigned int level;
225
226 if (f2fs_has_inline_dentry(dir)) {
227 *res_page = NULL;
228 de = find_in_inline_dir(dir, fname, res_page);
229 goto out;
230 }
231
232 if (npages == 0) {
233 *res_page = NULL;
234 goto out;
235 }
236
237 max_depth = F2FS_I(dir)->i_current_depth;
238 if (unlikely(max_depth > MAX_DIR_HASH_DEPTH)) {
239 f2fs_msg(F2FS_I_SB(dir)->sb, KERN_WARNING,
240 "Corrupted max_depth of %lu: %u",
241 dir->i_ino, max_depth);
242 max_depth = MAX_DIR_HASH_DEPTH;
243 f2fs_i_depth_write(dir, max_depth);
244 }
245
246 for (level = 0; level < max_depth; level++) {
247 *res_page = NULL;
248 de = find_in_level(dir, level, fname, res_page);
249 if (de || IS_ERR(*res_page))
250 break;
251 }
252 out:
253 return de;
254 }
255
256 /*
257 * Find an entry in the specified directory with the wanted name.
258 * It returns the page where the entry was found (as a parameter - res_page),
259 * and the entry itself. Page is returned mapped and unlocked.
260 * Entry is guaranteed to be valid.
261 */
262 struct f2fs_dir_entry *f2fs_find_entry(struct inode *dir,
263 const struct qstr *child, struct page **res_page)
264 {
265 struct f2fs_dir_entry *de = NULL;
266 struct fscrypt_name fname;
267 int err;
268
269 err = fscrypt_setup_filename(dir, child, 1, &fname);
270 if (err) {
271 *res_page = ERR_PTR(err);
272 return NULL;
273 }
274
275 de = __f2fs_find_entry(dir, &fname, res_page);
276
277 fscrypt_free_filename(&fname);
278 return de;
279 }
280
281 struct f2fs_dir_entry *f2fs_parent_dir(struct inode *dir, struct page **p)
282 {
283 struct qstr dotdot = QSTR_INIT("..", 2);
284
285 return f2fs_find_entry(dir, &dotdot, p);
286 }
287
288 ino_t f2fs_inode_by_name(struct inode *dir, const struct qstr *qstr,
289 struct page **page)
290 {
291 ino_t res = 0;
292 struct f2fs_dir_entry *de;
293
294 de = f2fs_find_entry(dir, qstr, page);
295 if (de) {
296 res = le32_to_cpu(de->ino);
297 f2fs_dentry_kunmap(dir, *page);
298 f2fs_put_page(*page, 0);
299 }
300
301 return res;
302 }
303
304 void f2fs_set_link(struct inode *dir, struct f2fs_dir_entry *de,
305 struct page *page, struct inode *inode)
306 {
307 enum page_type type = f2fs_has_inline_dentry(dir) ? NODE : DATA;
308 lock_page(page);
309 f2fs_wait_on_page_writeback(page, type, true);
310 de->ino = cpu_to_le32(inode->i_ino);
311 set_de_type(de, inode->i_mode);
312 f2fs_dentry_kunmap(dir, page);
313 set_page_dirty(page);
314
315 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
316 f2fs_mark_inode_dirty_sync(dir);
317 f2fs_put_page(page, 1);
318 }
319
320 static void init_dent_inode(const struct qstr *name, struct page *ipage)
321 {
322 struct f2fs_inode *ri;
323
324 f2fs_wait_on_page_writeback(ipage, NODE, true);
325
326 /* copy name info. to this inode page */
327 ri = F2FS_INODE(ipage);
328 ri->i_namelen = cpu_to_le32(name->len);
329 memcpy(ri->i_name, name->name, name->len);
330 set_page_dirty(ipage);
331 }
332
333 int update_dent_inode(struct inode *inode, struct inode *to,
334 const struct qstr *name)
335 {
336 struct page *page;
337
338 if (file_enc_name(to))
339 return 0;
340
341 page = get_node_page(F2FS_I_SB(inode), inode->i_ino);
342 if (IS_ERR(page))
343 return PTR_ERR(page);
344
345 init_dent_inode(name, page);
346 f2fs_put_page(page, 1);
347
348 return 0;
349 }
350
351 void do_make_empty_dir(struct inode *inode, struct inode *parent,
352 struct f2fs_dentry_ptr *d)
353 {
354 struct qstr dot = QSTR_INIT(".", 1);
355 struct qstr dotdot = QSTR_INIT("..", 2);
356
357 /* update dirent of "." */
358 f2fs_update_dentry(inode->i_ino, inode->i_mode, d, &dot, 0, 0);
359
360 /* update dirent of ".." */
361 f2fs_update_dentry(parent->i_ino, parent->i_mode, d, &dotdot, 0, 1);
362 }
363
364 static int make_empty_dir(struct inode *inode,
365 struct inode *parent, struct page *page)
366 {
367 struct page *dentry_page;
368 struct f2fs_dentry_block *dentry_blk;
369 struct f2fs_dentry_ptr d;
370
371 if (f2fs_has_inline_dentry(inode))
372 return make_empty_inline_dir(inode, parent, page);
373
374 dentry_page = get_new_data_page(inode, page, 0, true);
375 if (IS_ERR(dentry_page))
376 return PTR_ERR(dentry_page);
377
378 dentry_blk = kmap_atomic(dentry_page);
379
380 make_dentry_ptr(NULL, &d, (void *)dentry_blk, 1);
381 do_make_empty_dir(inode, parent, &d);
382
383 kunmap_atomic(dentry_blk);
384
385 set_page_dirty(dentry_page);
386 f2fs_put_page(dentry_page, 1);
387 return 0;
388 }
389
390 struct page *init_inode_metadata(struct inode *inode, struct inode *dir,
391 const struct qstr *new_name, const struct qstr *orig_name,
392 struct page *dpage)
393 {
394 struct page *page;
395 int err;
396
397 if (is_inode_flag_set(inode, FI_NEW_INODE)) {
398 page = new_inode_page(inode);
399 if (IS_ERR(page))
400 return page;
401
402 if (S_ISDIR(inode->i_mode)) {
403 /* in order to handle error case */
404 get_page(page);
405 err = make_empty_dir(inode, dir, page);
406 if (err) {
407 lock_page(page);
408 goto put_error;
409 }
410 put_page(page);
411 }
412
413 err = f2fs_init_acl(inode, dir, page, dpage);
414 if (err)
415 goto put_error;
416
417 err = f2fs_init_security(inode, dir, orig_name, page);
418 if (err)
419 goto put_error;
420
421 if (f2fs_encrypted_inode(dir) && f2fs_may_encrypt(inode)) {
422 err = fscrypt_inherit_context(dir, inode, page, false);
423 if (err)
424 goto put_error;
425 }
426 } else {
427 page = get_node_page(F2FS_I_SB(dir), inode->i_ino);
428 if (IS_ERR(page))
429 return page;
430
431 set_cold_node(inode, page);
432 }
433
434 if (new_name)
435 init_dent_inode(new_name, page);
436
437 /*
438 * This file should be checkpointed during fsync.
439 * We lost i_pino from now on.
440 */
441 if (is_inode_flag_set(inode, FI_INC_LINK)) {
442 file_lost_pino(inode);
443 /*
444 * If link the tmpfile to alias through linkat path,
445 * we should remove this inode from orphan list.
446 */
447 if (inode->i_nlink == 0)
448 remove_orphan_inode(F2FS_I_SB(dir), inode->i_ino);
449 f2fs_i_links_write(inode, true);
450 }
451 return page;
452
453 put_error:
454 clear_nlink(inode);
455 update_inode(inode, page);
456 f2fs_put_page(page, 1);
457 return ERR_PTR(err);
458 }
459
460 void update_parent_metadata(struct inode *dir, struct inode *inode,
461 unsigned int current_depth)
462 {
463 if (inode && is_inode_flag_set(inode, FI_NEW_INODE)) {
464 if (S_ISDIR(inode->i_mode))
465 f2fs_i_links_write(dir, true);
466 clear_inode_flag(inode, FI_NEW_INODE);
467 }
468 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
469 f2fs_mark_inode_dirty_sync(dir);
470
471 if (F2FS_I(dir)->i_current_depth != current_depth)
472 f2fs_i_depth_write(dir, current_depth);
473
474 if (inode && is_inode_flag_set(inode, FI_INC_LINK))
475 clear_inode_flag(inode, FI_INC_LINK);
476 }
477
478 int room_for_filename(const void *bitmap, int slots, int max_slots)
479 {
480 int bit_start = 0;
481 int zero_start, zero_end;
482 next:
483 zero_start = find_next_zero_bit_le(bitmap, max_slots, bit_start);
484 if (zero_start >= max_slots)
485 return max_slots;
486
487 zero_end = find_next_bit_le(bitmap, max_slots, zero_start);
488 if (zero_end - zero_start >= slots)
489 return zero_start;
490
491 bit_start = zero_end + 1;
492
493 if (zero_end + 1 >= max_slots)
494 return max_slots;
495 goto next;
496 }
497
498 void f2fs_update_dentry(nid_t ino, umode_t mode, struct f2fs_dentry_ptr *d,
499 const struct qstr *name, f2fs_hash_t name_hash,
500 unsigned int bit_pos)
501 {
502 struct f2fs_dir_entry *de;
503 int slots = GET_DENTRY_SLOTS(name->len);
504 int i;
505
506 de = &d->dentry[bit_pos];
507 de->hash_code = name_hash;
508 de->name_len = cpu_to_le16(name->len);
509 memcpy(d->filename[bit_pos], name->name, name->len);
510 de->ino = cpu_to_le32(ino);
511 set_de_type(de, mode);
512 for (i = 0; i < slots; i++) {
513 __set_bit_le(bit_pos + i, (void *)d->bitmap);
514 /* avoid wrong garbage data for readdir */
515 if (i)
516 (de + i)->name_len = 0;
517 }
518 }
519
520 int f2fs_add_regular_entry(struct inode *dir, const struct qstr *new_name,
521 const struct qstr *orig_name,
522 struct inode *inode, nid_t ino, umode_t mode)
523 {
524 unsigned int bit_pos;
525 unsigned int level;
526 unsigned int current_depth;
527 unsigned long bidx, block;
528 f2fs_hash_t dentry_hash;
529 unsigned int nbucket, nblock;
530 struct page *dentry_page = NULL;
531 struct f2fs_dentry_block *dentry_blk = NULL;
532 struct f2fs_dentry_ptr d;
533 struct page *page = NULL;
534 int slots, err = 0;
535
536 level = 0;
537 slots = GET_DENTRY_SLOTS(new_name->len);
538 dentry_hash = f2fs_dentry_hash(new_name);
539
540 current_depth = F2FS_I(dir)->i_current_depth;
541 if (F2FS_I(dir)->chash == dentry_hash) {
542 level = F2FS_I(dir)->clevel;
543 F2FS_I(dir)->chash = 0;
544 }
545
546 start:
547 #ifdef CONFIG_F2FS_FAULT_INJECTION
548 if (time_to_inject(FAULT_DIR_DEPTH))
549 return -ENOSPC;
550 #endif
551 if (unlikely(current_depth == MAX_DIR_HASH_DEPTH))
552 return -ENOSPC;
553
554 /* Increase the depth, if required */
555 if (level == current_depth)
556 ++current_depth;
557
558 nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level);
559 nblock = bucket_blocks(level);
560
561 bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level,
562 (le32_to_cpu(dentry_hash) % nbucket));
563
564 for (block = bidx; block <= (bidx + nblock - 1); block++) {
565 dentry_page = get_new_data_page(dir, NULL, block, true);
566 if (IS_ERR(dentry_page))
567 return PTR_ERR(dentry_page);
568
569 dentry_blk = kmap(dentry_page);
570 bit_pos = room_for_filename(&dentry_blk->dentry_bitmap,
571 slots, NR_DENTRY_IN_BLOCK);
572 if (bit_pos < NR_DENTRY_IN_BLOCK)
573 goto add_dentry;
574
575 kunmap(dentry_page);
576 f2fs_put_page(dentry_page, 1);
577 }
578
579 /* Move to next level to find the empty slot for new dentry */
580 ++level;
581 goto start;
582 add_dentry:
583 f2fs_wait_on_page_writeback(dentry_page, DATA, true);
584
585 if (inode) {
586 down_write(&F2FS_I(inode)->i_sem);
587 page = init_inode_metadata(inode, dir, new_name,
588 orig_name, NULL);
589 if (IS_ERR(page)) {
590 err = PTR_ERR(page);
591 goto fail;
592 }
593 if (f2fs_encrypted_inode(dir))
594 file_set_enc_name(inode);
595 }
596
597 make_dentry_ptr(NULL, &d, (void *)dentry_blk, 1);
598 f2fs_update_dentry(ino, mode, &d, new_name, dentry_hash, bit_pos);
599
600 set_page_dirty(dentry_page);
601
602 if (inode) {
603 f2fs_i_pino_write(inode, dir->i_ino);
604 f2fs_put_page(page, 1);
605 }
606
607 update_parent_metadata(dir, inode, current_depth);
608 fail:
609 if (inode)
610 up_write(&F2FS_I(inode)->i_sem);
611
612 kunmap(dentry_page);
613 f2fs_put_page(dentry_page, 1);
614
615 return err;
616 }
617
618 int __f2fs_do_add_link(struct inode *dir, struct fscrypt_name *fname,
619 struct inode *inode, nid_t ino, umode_t mode)
620 {
621 struct qstr new_name;
622 int err = -EAGAIN;
623
624 new_name.name = fname_name(fname);
625 new_name.len = fname_len(fname);
626
627 if (f2fs_has_inline_dentry(dir))
628 err = f2fs_add_inline_entry(dir, &new_name, fname->usr_fname,
629 inode, ino, mode);
630 if (err == -EAGAIN)
631 err = f2fs_add_regular_entry(dir, &new_name, fname->usr_fname,
632 inode, ino, mode);
633
634 f2fs_update_time(F2FS_I_SB(dir), REQ_TIME);
635 return err;
636 }
637
638 /*
639 * Caller should grab and release a rwsem by calling f2fs_lock_op() and
640 * f2fs_unlock_op().
641 */
642 int __f2fs_add_link(struct inode *dir, const struct qstr *name,
643 struct inode *inode, nid_t ino, umode_t mode)
644 {
645 struct fscrypt_name fname;
646 int err;
647
648 err = fscrypt_setup_filename(dir, name, 0, &fname);
649 if (err)
650 return err;
651
652 err = __f2fs_do_add_link(dir, &fname, inode, ino, mode);
653
654 fscrypt_free_filename(&fname);
655 return err;
656 }
657
658 int f2fs_do_tmpfile(struct inode *inode, struct inode *dir)
659 {
660 struct page *page;
661 int err = 0;
662
663 down_write(&F2FS_I(inode)->i_sem);
664 page = init_inode_metadata(inode, dir, NULL, NULL, NULL);
665 if (IS_ERR(page)) {
666 err = PTR_ERR(page);
667 goto fail;
668 }
669 f2fs_put_page(page, 1);
670
671 clear_inode_flag(inode, FI_NEW_INODE);
672 fail:
673 up_write(&F2FS_I(inode)->i_sem);
674 f2fs_update_time(F2FS_I_SB(inode), REQ_TIME);
675 return err;
676 }
677
678 void f2fs_drop_nlink(struct inode *dir, struct inode *inode)
679 {
680 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
681
682 down_write(&F2FS_I(inode)->i_sem);
683
684 if (S_ISDIR(inode->i_mode))
685 f2fs_i_links_write(dir, false);
686 inode->i_ctime = CURRENT_TIME;
687
688 f2fs_i_links_write(inode, false);
689 if (S_ISDIR(inode->i_mode)) {
690 f2fs_i_links_write(inode, false);
691 f2fs_i_size_write(inode, 0);
692 }
693 up_write(&F2FS_I(inode)->i_sem);
694
695 if (inode->i_nlink == 0)
696 add_orphan_inode(inode);
697 else
698 release_orphan_inode(sbi);
699 }
700
701 /*
702 * It only removes the dentry from the dentry page, corresponding name
703 * entry in name page does not need to be touched during deletion.
704 */
705 void f2fs_delete_entry(struct f2fs_dir_entry *dentry, struct page *page,
706 struct inode *dir, struct inode *inode)
707 {
708 struct f2fs_dentry_block *dentry_blk;
709 unsigned int bit_pos;
710 int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len));
711 int i;
712
713 f2fs_update_time(F2FS_I_SB(dir), REQ_TIME);
714
715 if (f2fs_has_inline_dentry(dir))
716 return f2fs_delete_inline_entry(dentry, page, dir, inode);
717
718 lock_page(page);
719 f2fs_wait_on_page_writeback(page, DATA, true);
720
721 dentry_blk = page_address(page);
722 bit_pos = dentry - dentry_blk->dentry;
723 for (i = 0; i < slots; i++)
724 clear_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap);
725
726 /* Let's check and deallocate this dentry page */
727 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
728 NR_DENTRY_IN_BLOCK,
729 0);
730 kunmap(page); /* kunmap - pair of f2fs_find_entry */
731 set_page_dirty(page);
732
733 dir->i_ctime = dir->i_mtime = CURRENT_TIME;
734 f2fs_mark_inode_dirty_sync(dir);
735
736 if (inode)
737 f2fs_drop_nlink(dir, inode);
738
739 if (bit_pos == NR_DENTRY_IN_BLOCK &&
740 !truncate_hole(dir, page->index, page->index + 1)) {
741 clear_page_dirty_for_io(page);
742 ClearPagePrivate(page);
743 ClearPageUptodate(page);
744 inode_dec_dirty_pages(dir);
745 }
746 f2fs_put_page(page, 1);
747 }
748
749 bool f2fs_empty_dir(struct inode *dir)
750 {
751 unsigned long bidx;
752 struct page *dentry_page;
753 unsigned int bit_pos;
754 struct f2fs_dentry_block *dentry_blk;
755 unsigned long nblock = dir_blocks(dir);
756
757 if (f2fs_has_inline_dentry(dir))
758 return f2fs_empty_inline_dir(dir);
759
760 for (bidx = 0; bidx < nblock; bidx++) {
761 dentry_page = get_lock_data_page(dir, bidx, false);
762 if (IS_ERR(dentry_page)) {
763 if (PTR_ERR(dentry_page) == -ENOENT)
764 continue;
765 else
766 return false;
767 }
768
769 dentry_blk = kmap_atomic(dentry_page);
770 if (bidx == 0)
771 bit_pos = 2;
772 else
773 bit_pos = 0;
774 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
775 NR_DENTRY_IN_BLOCK,
776 bit_pos);
777 kunmap_atomic(dentry_blk);
778
779 f2fs_put_page(dentry_page, 1);
780
781 if (bit_pos < NR_DENTRY_IN_BLOCK)
782 return false;
783 }
784 return true;
785 }
786
787 bool f2fs_fill_dentries(struct dir_context *ctx, struct f2fs_dentry_ptr *d,
788 unsigned int start_pos, struct fscrypt_str *fstr)
789 {
790 unsigned char d_type = DT_UNKNOWN;
791 unsigned int bit_pos;
792 struct f2fs_dir_entry *de = NULL;
793 struct fscrypt_str de_name = FSTR_INIT(NULL, 0);
794
795 bit_pos = ((unsigned long)ctx->pos % d->max);
796
797 while (bit_pos < d->max) {
798 bit_pos = find_next_bit_le(d->bitmap, d->max, bit_pos);
799 if (bit_pos >= d->max)
800 break;
801
802 de = &d->dentry[bit_pos];
803 if (de->name_len == 0) {
804 bit_pos++;
805 ctx->pos = start_pos + bit_pos;
806 continue;
807 }
808
809 d_type = get_de_type(de);
810
811 de_name.name = d->filename[bit_pos];
812 de_name.len = le16_to_cpu(de->name_len);
813
814 if (f2fs_encrypted_inode(d->inode)) {
815 int save_len = fstr->len;
816 int ret;
817
818 ret = fscrypt_fname_disk_to_usr(d->inode,
819 (u32)de->hash_code, 0,
820 &de_name, fstr);
821 if (ret < 0)
822 return true;
823
824 de_name = *fstr;
825 fstr->len = save_len;
826 }
827
828 if (!dir_emit(ctx, de_name.name, de_name.len,
829 le32_to_cpu(de->ino), d_type))
830 return true;
831
832 bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
833 ctx->pos = start_pos + bit_pos;
834 }
835 return false;
836 }
837
838 static int f2fs_readdir(struct file *file, struct dir_context *ctx)
839 {
840 struct inode *inode = file_inode(file);
841 unsigned long npages = dir_blocks(inode);
842 struct f2fs_dentry_block *dentry_blk = NULL;
843 struct page *dentry_page = NULL;
844 struct file_ra_state *ra = &file->f_ra;
845 unsigned int n = ((unsigned long)ctx->pos / NR_DENTRY_IN_BLOCK);
846 struct f2fs_dentry_ptr d;
847 struct fscrypt_str fstr = FSTR_INIT(NULL, 0);
848 int err = 0;
849
850 if (f2fs_encrypted_inode(inode)) {
851 err = fscrypt_get_encryption_info(inode);
852 if (err && err != -ENOKEY)
853 return err;
854
855 err = fscrypt_fname_alloc_buffer(inode, F2FS_NAME_LEN, &fstr);
856 if (err < 0)
857 return err;
858 }
859
860 if (f2fs_has_inline_dentry(inode)) {
861 err = f2fs_read_inline_dir(file, ctx, &fstr);
862 goto out;
863 }
864
865 /* readahead for multi pages of dir */
866 if (npages - n > 1 && !ra_has_index(ra, n))
867 page_cache_sync_readahead(inode->i_mapping, ra, file, n,
868 min(npages - n, (pgoff_t)MAX_DIR_RA_PAGES));
869
870 for (; n < npages; n++) {
871 dentry_page = get_lock_data_page(inode, n, false);
872 if (IS_ERR(dentry_page)) {
873 err = PTR_ERR(dentry_page);
874 if (err == -ENOENT)
875 continue;
876 else
877 goto out;
878 }
879
880 dentry_blk = kmap(dentry_page);
881
882 make_dentry_ptr(inode, &d, (void *)dentry_blk, 1);
883
884 if (f2fs_fill_dentries(ctx, &d, n * NR_DENTRY_IN_BLOCK, &fstr)) {
885 kunmap(dentry_page);
886 f2fs_put_page(dentry_page, 1);
887 break;
888 }
889
890 ctx->pos = (n + 1) * NR_DENTRY_IN_BLOCK;
891 kunmap(dentry_page);
892 f2fs_put_page(dentry_page, 1);
893 }
894 err = 0;
895 out:
896 fscrypt_fname_free_buffer(&fstr);
897 return err;
898 }
899
900 static int f2fs_dir_open(struct inode *inode, struct file *filp)
901 {
902 if (f2fs_encrypted_inode(inode))
903 return fscrypt_get_encryption_info(inode) ? -EACCES : 0;
904 return 0;
905 }
906
907 const struct file_operations f2fs_dir_operations = {
908 .llseek = generic_file_llseek,
909 .read = generic_read_dir,
910 .iterate_shared = f2fs_readdir,
911 .fsync = f2fs_sync_file,
912 .open = f2fs_dir_open,
913 .unlocked_ioctl = f2fs_ioctl,
914 #ifdef CONFIG_COMPAT
915 .compat_ioctl = f2fs_compat_ioctl,
916 #endif
917 };
Linux kernel - Deliverables
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