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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
18static 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
24static 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
32static 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
40unsigned 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
52static 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
62void set_de_type(struct f2fs_dir_entry *de, umode_t mode)
63{
64 de->file_type = f2fs_type_by_mode[(mode & S_IFMT) >> S_SHIFT];
65}
66
67static unsigned long dir_block_index(unsigned int level,
68 int dir_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, dir_level) * bucket_blocks(i);
75 bidx += idx * bucket_blocks(level);
76 return bidx;
77}
78
79static struct f2fs_dir_entry *find_in_block(struct page *dentry_page,
80 struct fscrypt_name *fname,
81 f2fs_hash_t namehash,
82 int *max_slots,
83 struct page **res_page)
84{
85 struct f2fs_dentry_block *dentry_blk;
86 struct f2fs_dir_entry *de;
87 struct f2fs_dentry_ptr d;
88
89 dentry_blk = (struct f2fs_dentry_block *)kmap(dentry_page);
90
91 make_dentry_ptr(NULL, &d, (void *)dentry_blk, 1);
92 de = find_target_dentry(fname, namehash, max_slots, &d);
93 if (de)
94 *res_page = dentry_page;
95 else
96 kunmap(dentry_page);
97
98 /*
99 * For the most part, it should be a bug when name_len is zero.
100 * We stop here for figuring out where the bugs has occurred.
101 */
102 f2fs_bug_on(F2FS_P_SB(dentry_page), d.max < 0);
103 return de;
104}
105
106struct f2fs_dir_entry *find_target_dentry(struct fscrypt_name *fname,
107 f2fs_hash_t namehash, int *max_slots,
108 struct f2fs_dentry_ptr *d)
109{
110 struct f2fs_dir_entry *de;
111 unsigned long bit_pos = 0;
112 int max_len = 0;
113 struct fscrypt_str de_name = FSTR_INIT(NULL, 0);
114 struct fscrypt_str *name = &fname->disk_name;
115
116 if (max_slots)
117 *max_slots = 0;
118 while (bit_pos < d->max) {
119 if (!test_bit_le(bit_pos, d->bitmap)) {
120 bit_pos++;
121 max_len++;
122 continue;
123 }
124
125 de = &d->dentry[bit_pos];
126
127 /* encrypted case */
128 de_name.name = d->filename[bit_pos];
129 de_name.len = le16_to_cpu(de->name_len);
130
131 /* show encrypted name */
132 if (fname->hash) {
133 if (de->hash_code == fname->hash)
134 goto found;
135 } else if (de_name.len == name->len &&
136 de->hash_code == namehash &&
137 !memcmp(de_name.name, name->name, name->len))
138 goto found;
139
140 if (max_slots && max_len > *max_slots)
141 *max_slots = max_len;
142 max_len = 0;
143
144 /* remain bug on condition */
145 if (unlikely(!de->name_len))
146 d->max = -1;
147
148 bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
149 }
150
151 de = NULL;
152found:
153 if (max_slots && max_len > *max_slots)
154 *max_slots = max_len;
155 return de;
156}
157
158static struct f2fs_dir_entry *find_in_level(struct inode *dir,
159 unsigned int level,
160 struct fscrypt_name *fname,
161 struct page **res_page)
162{
163 struct qstr name = FSTR_TO_QSTR(&fname->disk_name);
164 int s = GET_DENTRY_SLOTS(name.len);
165 unsigned int nbucket, nblock;
166 unsigned int bidx, end_block;
167 struct page *dentry_page;
168 struct f2fs_dir_entry *de = NULL;
169 bool room = false;
170 int max_slots;
171 f2fs_hash_t namehash;
172
173 namehash = f2fs_dentry_hash(&name);
174
175 nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level);
176 nblock = bucket_blocks(level);
177
178 bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level,
179 le32_to_cpu(namehash) % nbucket);
180 end_block = bidx + nblock;
181
182 for (; bidx < end_block; bidx++) {
183 /* no need to allocate new dentry pages to all the indices */
184 dentry_page = find_data_page(dir, bidx);
185 if (IS_ERR(dentry_page)) {
186 room = true;
187 continue;
188 }
189
190 de = find_in_block(dentry_page, fname, namehash, &max_slots,
191 res_page);
192 if (de)
193 break;
194
195 if (max_slots >= s)
196 room = true;
197 f2fs_put_page(dentry_page, 0);
198 }
199
200 if (!de && room && F2FS_I(dir)->chash != namehash) {
201 F2FS_I(dir)->chash = namehash;
202 F2FS_I(dir)->clevel = level;
203 }
204
205 return de;
206}
207
208/*
209 * Find an entry in the specified directory with the wanted name.
210 * It returns the page where the entry was found (as a parameter - res_page),
211 * and the entry itself. Page is returned mapped and unlocked.
212 * Entry is guaranteed to be valid.
213 */
214struct f2fs_dir_entry *f2fs_find_entry(struct inode *dir,
215 struct qstr *child, struct page **res_page)
216{
217 unsigned long npages = dir_blocks(dir);
218 struct f2fs_dir_entry *de = NULL;
219 unsigned int max_depth;
220 unsigned int level;
221 struct fscrypt_name fname;
222 int err;
223
224 *res_page = NULL;
225
226 err = fscrypt_setup_filename(dir, child, 1, &fname);
227 if (err)
228 return NULL;
229
230 if (f2fs_has_inline_dentry(dir)) {
231 de = find_in_inline_dir(dir, &fname, res_page);
232 goto out;
233 }
234
235 if (npages == 0)
236 goto out;
237
238 max_depth = F2FS_I(dir)->i_current_depth;
239 if (unlikely(max_depth > MAX_DIR_HASH_DEPTH)) {
240 f2fs_msg(F2FS_I_SB(dir)->sb, KERN_WARNING,
241 "Corrupted max_depth of %lu: %u",
242 dir->i_ino, max_depth);
243 max_depth = MAX_DIR_HASH_DEPTH;
244 F2FS_I(dir)->i_current_depth = max_depth;
245 mark_inode_dirty(dir);
246 }
247
248 for (level = 0; level < max_depth; level++) {
249 de = find_in_level(dir, level, &fname, res_page);
250 if (de)
251 break;
252 }
253out:
254 fscrypt_free_filename(&fname);
255 return de;
256}
257
258struct f2fs_dir_entry *f2fs_parent_dir(struct inode *dir, struct page **p)
259{
260 struct page *page;
261 struct f2fs_dir_entry *de;
262 struct f2fs_dentry_block *dentry_blk;
263
264 if (f2fs_has_inline_dentry(dir))
265 return f2fs_parent_inline_dir(dir, p);
266
267 page = get_lock_data_page(dir, 0, false);
268 if (IS_ERR(page))
269 return NULL;
270
271 dentry_blk = kmap(page);
272 de = &dentry_blk->dentry[1];
273 *p = page;
274 unlock_page(page);
275 return de;
276}
277
278ino_t f2fs_inode_by_name(struct inode *dir, struct qstr *qstr)
279{
280 ino_t res = 0;
281 struct f2fs_dir_entry *de;
282 struct page *page;
283
284 de = f2fs_find_entry(dir, qstr, &page);
285 if (de) {
286 res = le32_to_cpu(de->ino);
287 f2fs_dentry_kunmap(dir, page);
288 f2fs_put_page(page, 0);
289 }
290
291 return res;
292}
293
294void f2fs_set_link(struct inode *dir, struct f2fs_dir_entry *de,
295 struct page *page, struct inode *inode)
296{
297 enum page_type type = f2fs_has_inline_dentry(dir) ? NODE : DATA;
298 lock_page(page);
299 f2fs_wait_on_page_writeback(page, type, true);
300 de->ino = cpu_to_le32(inode->i_ino);
301 set_de_type(de, inode->i_mode);
302 f2fs_dentry_kunmap(dir, page);
303 set_page_dirty(page);
304 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
305 mark_inode_dirty(dir);
306
307 f2fs_put_page(page, 1);
308}
309
310static void init_dent_inode(const struct qstr *name, struct page *ipage)
311{
312 struct f2fs_inode *ri;
313
314 f2fs_wait_on_page_writeback(ipage, NODE, true);
315
316 /* copy name info. to this inode page */
317 ri = F2FS_INODE(ipage);
318 ri->i_namelen = cpu_to_le32(name->len);
319 memcpy(ri->i_name, name->name, name->len);
320 set_page_dirty(ipage);
321}
322
323int update_dent_inode(struct inode *inode, struct inode *to,
324 const struct qstr *name)
325{
326 struct page *page;
327
328 if (file_enc_name(to))
329 return 0;
330
331 page = get_node_page(F2FS_I_SB(inode), inode->i_ino);
332 if (IS_ERR(page))
333 return PTR_ERR(page);
334
335 init_dent_inode(name, page);
336 f2fs_put_page(page, 1);
337
338 return 0;
339}
340
341void do_make_empty_dir(struct inode *inode, struct inode *parent,
342 struct f2fs_dentry_ptr *d)
343{
344 struct qstr dot = QSTR_INIT(".", 1);
345 struct qstr dotdot = QSTR_INIT("..", 2);
346
347 /* update dirent of "." */
348 f2fs_update_dentry(inode->i_ino, inode->i_mode, d, &dot, 0, 0);
349
350 /* update dirent of ".." */
351 f2fs_update_dentry(parent->i_ino, parent->i_mode, d, &dotdot, 0, 1);
352}
353
354static int make_empty_dir(struct inode *inode,
355 struct inode *parent, struct page *page)
356{
357 struct page *dentry_page;
358 struct f2fs_dentry_block *dentry_blk;
359 struct f2fs_dentry_ptr d;
360
361 if (f2fs_has_inline_dentry(inode))
362 return make_empty_inline_dir(inode, parent, page);
363
364 dentry_page = get_new_data_page(inode, page, 0, true);
365 if (IS_ERR(dentry_page))
366 return PTR_ERR(dentry_page);
367
368 dentry_blk = kmap_atomic(dentry_page);
369
370 make_dentry_ptr(NULL, &d, (void *)dentry_blk, 1);
371 do_make_empty_dir(inode, parent, &d);
372
373 kunmap_atomic(dentry_blk);
374
375 set_page_dirty(dentry_page);
376 f2fs_put_page(dentry_page, 1);
377 return 0;
378}
379
380struct page *init_inode_metadata(struct inode *inode, struct inode *dir,
381 const struct qstr *name, struct page *dpage)
382{
383 struct page *page;
384 int err;
385
386 if (is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) {
387 page = new_inode_page(inode);
388 if (IS_ERR(page))
389 return page;
390
391 if (S_ISDIR(inode->i_mode)) {
392 err = make_empty_dir(inode, dir, page);
393 if (err)
394 goto error;
395 }
396
397 err = f2fs_init_acl(inode, dir, page, dpage);
398 if (err)
399 goto put_error;
400
401 err = f2fs_init_security(inode, dir, name, page);
402 if (err)
403 goto put_error;
404
405 if (f2fs_encrypted_inode(dir) && f2fs_may_encrypt(inode)) {
406 err = fscrypt_inherit_context(dir, inode, page, false);
407 if (err)
408 goto put_error;
409 }
410 } else {
411 page = get_node_page(F2FS_I_SB(dir), inode->i_ino);
412 if (IS_ERR(page))
413 return page;
414
415 set_cold_node(inode, page);
416 }
417
418 if (name)
419 init_dent_inode(name, page);
420
421 /*
422 * This file should be checkpointed during fsync.
423 * We lost i_pino from now on.
424 */
425 if (is_inode_flag_set(F2FS_I(inode), FI_INC_LINK)) {
426 file_lost_pino(inode);
427 /*
428 * If link the tmpfile to alias through linkat path,
429 * we should remove this inode from orphan list.
430 */
431 if (inode->i_nlink == 0)
432 remove_orphan_inode(F2FS_I_SB(dir), inode->i_ino);
433 inc_nlink(inode);
434 }
435 return page;
436
437put_error:
438 f2fs_put_page(page, 1);
439error:
440 /* once the failed inode becomes a bad inode, i_mode is S_IFREG */
441 truncate_inode_pages(&inode->i_data, 0);
442 truncate_blocks(inode, 0, false);
443 remove_dirty_inode(inode);
444 remove_inode_page(inode);
445 return ERR_PTR(err);
446}
447
448void update_parent_metadata(struct inode *dir, struct inode *inode,
449 unsigned int current_depth)
450{
451 if (inode && is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) {
452 if (S_ISDIR(inode->i_mode)) {
453 inc_nlink(dir);
454 set_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
455 }
456 clear_inode_flag(F2FS_I(inode), FI_NEW_INODE);
457 }
458 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
459 mark_inode_dirty(dir);
460
461 if (F2FS_I(dir)->i_current_depth != current_depth) {
462 F2FS_I(dir)->i_current_depth = current_depth;
463 set_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
464 }
465
466 if (inode && is_inode_flag_set(F2FS_I(inode), FI_INC_LINK))
467 clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
468}
469
470int room_for_filename(const void *bitmap, int slots, int max_slots)
471{
472 int bit_start = 0;
473 int zero_start, zero_end;
474next:
475 zero_start = find_next_zero_bit_le(bitmap, max_slots, bit_start);
476 if (zero_start >= max_slots)
477 return max_slots;
478
479 zero_end = find_next_bit_le(bitmap, max_slots, zero_start);
480 if (zero_end - zero_start >= slots)
481 return zero_start;
482
483 bit_start = zero_end + 1;
484
485 if (zero_end + 1 >= max_slots)
486 return max_slots;
487 goto next;
488}
489
490void f2fs_update_dentry(nid_t ino, umode_t mode, struct f2fs_dentry_ptr *d,
491 const struct qstr *name, f2fs_hash_t name_hash,
492 unsigned int bit_pos)
493{
494 struct f2fs_dir_entry *de;
495 int slots = GET_DENTRY_SLOTS(name->len);
496 int i;
497
498 de = &d->dentry[bit_pos];
499 de->hash_code = name_hash;
500 de->name_len = cpu_to_le16(name->len);
501 memcpy(d->filename[bit_pos], name->name, name->len);
502 de->ino = cpu_to_le32(ino);
503 set_de_type(de, mode);
504 for (i = 0; i < slots; i++) {
505 test_and_set_bit_le(bit_pos + i, (void *)d->bitmap);
506 /* avoid wrong garbage data for readdir */
507 if (i)
508 (de + i)->name_len = 0;
509 }
510}
511
512/*
513 * Caller should grab and release a rwsem by calling f2fs_lock_op() and
514 * f2fs_unlock_op().
515 */
516int __f2fs_add_link(struct inode *dir, const struct qstr *name,
517 struct inode *inode, nid_t ino, umode_t mode)
518{
519 unsigned int bit_pos;
520 unsigned int level;
521 unsigned int current_depth;
522 unsigned long bidx, block;
523 f2fs_hash_t dentry_hash;
524 unsigned int nbucket, nblock;
525 struct page *dentry_page = NULL;
526 struct f2fs_dentry_block *dentry_blk = NULL;
527 struct f2fs_dentry_ptr d;
528 struct page *page = NULL;
529 struct fscrypt_name fname;
530 struct qstr new_name;
531 int slots, err;
532
533 err = fscrypt_setup_filename(dir, name, 0, &fname);
534 if (err)
535 return err;
536
537 new_name.name = fname_name(&fname);
538 new_name.len = fname_len(&fname);
539
540 if (f2fs_has_inline_dentry(dir)) {
541 err = f2fs_add_inline_entry(dir, &new_name, inode, ino, mode);
542 if (!err || err != -EAGAIN)
543 goto out;
544 else
545 err = 0;
546 }
547
548 level = 0;
549 slots = GET_DENTRY_SLOTS(new_name.len);
550 dentry_hash = f2fs_dentry_hash(&new_name);
551
552 current_depth = F2FS_I(dir)->i_current_depth;
553 if (F2FS_I(dir)->chash == dentry_hash) {
554 level = F2FS_I(dir)->clevel;
555 F2FS_I(dir)->chash = 0;
556 }
557
558start:
559 if (unlikely(current_depth == MAX_DIR_HASH_DEPTH)) {
560 err = -ENOSPC;
561 goto out;
562 }
563
564 /* Increase the depth, if required */
565 if (level == current_depth)
566 ++current_depth;
567
568 nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level);
569 nblock = bucket_blocks(level);
570
571 bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level,
572 (le32_to_cpu(dentry_hash) % nbucket));
573
574 for (block = bidx; block <= (bidx + nblock - 1); block++) {
575 dentry_page = get_new_data_page(dir, NULL, block, true);
576 if (IS_ERR(dentry_page)) {
577 err = PTR_ERR(dentry_page);
578 goto out;
579 }
580
581 dentry_blk = kmap(dentry_page);
582 bit_pos = room_for_filename(&dentry_blk->dentry_bitmap,
583 slots, NR_DENTRY_IN_BLOCK);
584 if (bit_pos < NR_DENTRY_IN_BLOCK)
585 goto add_dentry;
586
587 kunmap(dentry_page);
588 f2fs_put_page(dentry_page, 1);
589 }
590
591 /* Move to next level to find the empty slot for new dentry */
592 ++level;
593 goto start;
594add_dentry:
595 f2fs_wait_on_page_writeback(dentry_page, DATA, true);
596
597 if (inode) {
598 down_write(&F2FS_I(inode)->i_sem);
599 page = init_inode_metadata(inode, dir, &new_name, NULL);
600 if (IS_ERR(page)) {
601 err = PTR_ERR(page);
602 goto fail;
603 }
604 if (f2fs_encrypted_inode(dir))
605 file_set_enc_name(inode);
606 }
607
608 make_dentry_ptr(NULL, &d, (void *)dentry_blk, 1);
609 f2fs_update_dentry(ino, mode, &d, &new_name, dentry_hash, bit_pos);
610
611 set_page_dirty(dentry_page);
612
613 if (inode) {
614 /* we don't need to mark_inode_dirty now */
615 F2FS_I(inode)->i_pino = dir->i_ino;
616 update_inode(inode, page);
617 f2fs_put_page(page, 1);
618 }
619
620 update_parent_metadata(dir, inode, current_depth);
621fail:
622 if (inode)
623 up_write(&F2FS_I(inode)->i_sem);
624
625 if (is_inode_flag_set(F2FS_I(dir), FI_UPDATE_DIR)) {
626 update_inode_page(dir);
627 clear_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
628 }
629 kunmap(dentry_page);
630 f2fs_put_page(dentry_page, 1);
631out:
632 fscrypt_free_filename(&fname);
633 f2fs_update_time(F2FS_I_SB(dir), REQ_TIME);
634 return err;
635}
636
637int f2fs_do_tmpfile(struct inode *inode, struct inode *dir)
638{
639 struct page *page;
640 int err = 0;
641
642 down_write(&F2FS_I(inode)->i_sem);
643 page = init_inode_metadata(inode, dir, NULL, NULL);
644 if (IS_ERR(page)) {
645 err = PTR_ERR(page);
646 goto fail;
647 }
648 /* we don't need to mark_inode_dirty now */
649 update_inode(inode, page);
650 f2fs_put_page(page, 1);
651
652 clear_inode_flag(F2FS_I(inode), FI_NEW_INODE);
653fail:
654 up_write(&F2FS_I(inode)->i_sem);
655 f2fs_update_time(F2FS_I_SB(inode), REQ_TIME);
656 return err;
657}
658
659void f2fs_drop_nlink(struct inode *dir, struct inode *inode, struct page *page)
660{
661 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
662
663 down_write(&F2FS_I(inode)->i_sem);
664
665 if (S_ISDIR(inode->i_mode)) {
666 drop_nlink(dir);
667 if (page)
668 update_inode(dir, page);
669 else
670 update_inode_page(dir);
671 }
672 inode->i_ctime = CURRENT_TIME;
673
674 drop_nlink(inode);
675 if (S_ISDIR(inode->i_mode)) {
676 drop_nlink(inode);
677 i_size_write(inode, 0);
678 }
679 up_write(&F2FS_I(inode)->i_sem);
680 update_inode_page(inode);
681
682 if (inode->i_nlink == 0)
683 add_orphan_inode(sbi, inode->i_ino);
684 else
685 release_orphan_inode(sbi);
686}
687
688/*
689 * It only removes the dentry from the dentry page, corresponding name
690 * entry in name page does not need to be touched during deletion.
691 */
692void f2fs_delete_entry(struct f2fs_dir_entry *dentry, struct page *page,
693 struct inode *dir, struct inode *inode)
694{
695 struct f2fs_dentry_block *dentry_blk;
696 unsigned int bit_pos;
697 int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len));
698 int i;
699
700 f2fs_update_time(F2FS_I_SB(dir), REQ_TIME);
701
702 if (f2fs_has_inline_dentry(dir))
703 return f2fs_delete_inline_entry(dentry, page, dir, inode);
704
705 lock_page(page);
706 f2fs_wait_on_page_writeback(page, DATA, true);
707
708 dentry_blk = page_address(page);
709 bit_pos = dentry - dentry_blk->dentry;
710 for (i = 0; i < slots; i++)
711 clear_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap);
712
713 /* Let's check and deallocate this dentry page */
714 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
715 NR_DENTRY_IN_BLOCK,
716 0);
717 kunmap(page); /* kunmap - pair of f2fs_find_entry */
718 set_page_dirty(page);
719
720 dir->i_ctime = dir->i_mtime = CURRENT_TIME;
721
722 if (inode)
723 f2fs_drop_nlink(dir, inode, NULL);
724
725 if (bit_pos == NR_DENTRY_IN_BLOCK &&
726 !truncate_hole(dir, page->index, page->index + 1)) {
727 clear_page_dirty_for_io(page);
728 ClearPagePrivate(page);
729 ClearPageUptodate(page);
730 inode_dec_dirty_pages(dir);
731 }
732 f2fs_put_page(page, 1);
733}
734
735bool f2fs_empty_dir(struct inode *dir)
736{
737 unsigned long bidx;
738 struct page *dentry_page;
739 unsigned int bit_pos;
740 struct f2fs_dentry_block *dentry_blk;
741 unsigned long nblock = dir_blocks(dir);
742
743 if (f2fs_has_inline_dentry(dir))
744 return f2fs_empty_inline_dir(dir);
745
746 for (bidx = 0; bidx < nblock; bidx++) {
747 dentry_page = get_lock_data_page(dir, bidx, false);
748 if (IS_ERR(dentry_page)) {
749 if (PTR_ERR(dentry_page) == -ENOENT)
750 continue;
751 else
752 return false;
753 }
754
755 dentry_blk = kmap_atomic(dentry_page);
756 if (bidx == 0)
757 bit_pos = 2;
758 else
759 bit_pos = 0;
760 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
761 NR_DENTRY_IN_BLOCK,
762 bit_pos);
763 kunmap_atomic(dentry_blk);
764
765 f2fs_put_page(dentry_page, 1);
766
767 if (bit_pos < NR_DENTRY_IN_BLOCK)
768 return false;
769 }
770 return true;
771}
772
773bool f2fs_fill_dentries(struct dir_context *ctx, struct f2fs_dentry_ptr *d,
774 unsigned int start_pos, struct fscrypt_str *fstr)
775{
776 unsigned char d_type = DT_UNKNOWN;
777 unsigned int bit_pos;
778 struct f2fs_dir_entry *de = NULL;
779 struct fscrypt_str de_name = FSTR_INIT(NULL, 0);
780
781 bit_pos = ((unsigned long)ctx->pos % d->max);
782
783 while (bit_pos < d->max) {
784 bit_pos = find_next_bit_le(d->bitmap, d->max, bit_pos);
785 if (bit_pos >= d->max)
786 break;
787
788 de = &d->dentry[bit_pos];
789 if (de->name_len == 0) {
790 bit_pos++;
791 ctx->pos = start_pos + bit_pos;
792 continue;
793 }
794
795 if (de->file_type < F2FS_FT_MAX)
796 d_type = f2fs_filetype_table[de->file_type];
797 else
798 d_type = DT_UNKNOWN;
799
800 de_name.name = d->filename[bit_pos];
801 de_name.len = le16_to_cpu(de->name_len);
802
803 if (f2fs_encrypted_inode(d->inode)) {
804 int save_len = fstr->len;
805 int ret;
806
807 de_name.name = kmalloc(de_name.len, GFP_NOFS);
808 if (!de_name.name)
809 return false;
810
811 memcpy(de_name.name, d->filename[bit_pos], de_name.len);
812
813 ret = fscrypt_fname_disk_to_usr(d->inode,
814 (u32)de->hash_code, 0,
815 &de_name, fstr);
816 kfree(de_name.name);
817 if (ret < 0)
818 return true;
819
820 de_name = *fstr;
821 fstr->len = save_len;
822 }
823
824 if (!dir_emit(ctx, de_name.name, de_name.len,
825 le32_to_cpu(de->ino), d_type))
826 return true;
827
828 bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
829 ctx->pos = start_pos + bit_pos;
830 }
831 return false;
832}
833
834static int f2fs_readdir(struct file *file, struct dir_context *ctx)
835{
836 struct inode *inode = file_inode(file);
837 unsigned long npages = dir_blocks(inode);
838 struct f2fs_dentry_block *dentry_blk = NULL;
839 struct page *dentry_page = NULL;
840 struct file_ra_state *ra = &file->f_ra;
841 unsigned int n = ((unsigned long)ctx->pos / NR_DENTRY_IN_BLOCK);
842 struct f2fs_dentry_ptr d;
843 struct fscrypt_str fstr = FSTR_INIT(NULL, 0);
844 int err = 0;
845
846 if (f2fs_encrypted_inode(inode)) {
847 err = fscrypt_get_encryption_info(inode);
848 if (err && err != -ENOKEY)
849 return err;
850
851 err = fscrypt_fname_alloc_buffer(inode, F2FS_NAME_LEN, &fstr);
852 if (err < 0)
853 return err;
854 }
855
856 if (f2fs_has_inline_dentry(inode)) {
857 err = f2fs_read_inline_dir(file, ctx, &fstr);
858 goto out;
859 }
860
861 /* readahead for multi pages of dir */
862 if (npages - n > 1 && !ra_has_index(ra, n))
863 page_cache_sync_readahead(inode->i_mapping, ra, file, n,
864 min(npages - n, (pgoff_t)MAX_DIR_RA_PAGES));
865
866 for (; n < npages; n++) {
867 dentry_page = get_lock_data_page(inode, n, false);
868 if (IS_ERR(dentry_page)) {
869 err = PTR_ERR(dentry_page);
870 if (err == -ENOENT)
871 continue;
872 else
873 goto out;
874 }
875
876 dentry_blk = kmap(dentry_page);
877
878 make_dentry_ptr(inode, &d, (void *)dentry_blk, 1);
879
880 if (f2fs_fill_dentries(ctx, &d, n * NR_DENTRY_IN_BLOCK, &fstr)) {
881 kunmap(dentry_page);
882 f2fs_put_page(dentry_page, 1);
883 break;
884 }
885
886 ctx->pos = (n + 1) * NR_DENTRY_IN_BLOCK;
887 kunmap(dentry_page);
888 f2fs_put_page(dentry_page, 1);
889 }
890out:
891 fscrypt_fname_free_buffer(&fstr);
892 return err;
893}
894
895static int f2fs_dir_open(struct inode *inode, struct file *filp)
896{
897 if (f2fs_encrypted_inode(inode))
898 return fscrypt_get_encryption_info(inode) ? -EACCES : 0;
899 return 0;
900}
901
902const struct file_operations f2fs_dir_operations = {
903 .llseek = generic_file_llseek,
904 .read = generic_read_dir,
905 .iterate = f2fs_readdir,
906 .fsync = f2fs_sync_file,
907 .open = f2fs_dir_open,
908 .unlocked_ioctl = f2fs_ioctl,
909#ifdef CONFIG_COMPAT
910 .compat_ioctl = f2fs_compat_ioctl,
911#endif
912};
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
18static 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
24static unsigned int dir_buckets(unsigned int level, int dir_level)
25{
26 if (level < MAX_DIR_HASH_DEPTH / 2)
27 return 1 << (level + dir_level);
28 else
29 return 1 << ((MAX_DIR_HASH_DEPTH / 2 + dir_level) - 1);
30}
31
32static 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
40static 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
52static 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
62static 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
68static unsigned long dir_block_index(unsigned int level,
69 int dir_level, unsigned int idx)
70{
71 unsigned long i;
72 unsigned long bidx = 0;
73
74 for (i = 0; i < level; i++)
75 bidx += dir_buckets(i, dir_level) * bucket_blocks(i);
76 bidx += idx * bucket_blocks(level);
77 return bidx;
78}
79
80static bool early_match_name(const char *name, size_t namelen,
81 f2fs_hash_t namehash, struct f2fs_dir_entry *de)
82{
83 if (le16_to_cpu(de->name_len) != namelen)
84 return false;
85
86 if (de->hash_code != namehash)
87 return false;
88
89 return true;
90}
91
92static 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)
95{
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;
100 int max_len = 0;
101
102 while (bit_pos < NR_DENTRY_IN_BLOCK) {
103 if (!test_bit_le(bit_pos, dentry_bits)) {
104 if (bit_pos == 0)
105 max_len = 1;
106 else if (!test_bit_le(bit_pos - 1, dentry_bits))
107 max_len++;
108 bit_pos++;
109 continue;
110 }
111 de = &dentry_blk->dentry[bit_pos];
112 if (early_match_name(name, namelen, namehash, de)) {
113 if (!memcmp(dentry_blk->filename[bit_pos],
114 name, namelen)) {
115 *res_page = dentry_page;
116 goto found;
117 }
118 }
119 if (max_len > *max_slots) {
120 *max_slots = max_len;
121 max_len = 0;
122 }
123 bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
124 }
125
126 de = NULL;
127 kunmap(dentry_page);
128found:
129 if (max_len > *max_slots)
130 *max_slots = max_len;
131 return de;
132}
133
134static 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)
137{
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;
143 bool room = false;
144 int max_slots = 0;
145
146 f2fs_bug_on(level > MAX_DIR_HASH_DEPTH);
147
148 nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level);
149 nblock = bucket_blocks(level);
150
151 bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level,
152 le32_to_cpu(namehash) % nbucket);
153 end_block = bidx + nblock;
154
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)) {
159 room = true;
160 continue;
161 }
162
163 de = find_in_block(dentry_page, name, namelen,
164 &max_slots, namehash, res_page);
165 if (de)
166 break;
167
168 if (max_slots >= s)
169 room = true;
170 f2fs_put_page(dentry_page, 0);
171 }
172
173 if (!de && room && F2FS_I(dir)->chash != namehash) {
174 F2FS_I(dir)->chash = namehash;
175 F2FS_I(dir)->clevel = level;
176 }
177
178 return de;
179}
180
181/*
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.
186 */
187struct f2fs_dir_entry *f2fs_find_entry(struct inode *dir,
188 struct qstr *child, struct page **res_page)
189{
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;
196 unsigned int level;
197
198 if (npages == 0)
199 return NULL;
200
201 *res_page = NULL;
202
203 name_hash = f2fs_dentry_hash(name, namelen);
204 max_depth = F2FS_I(dir)->i_current_depth;
205
206 for (level = 0; level < max_depth; level++) {
207 de = find_in_level(dir, level, name,
208 namelen, name_hash, res_page);
209 if (de)
210 break;
211 }
212 if (!de && F2FS_I(dir)->chash != name_hash) {
213 F2FS_I(dir)->chash = name_hash;
214 F2FS_I(dir)->clevel = level - 1;
215 }
216 return de;
217}
218
219struct f2fs_dir_entry *f2fs_parent_dir(struct inode *dir, struct page **p)
220{
221 struct page *page;
222 struct f2fs_dir_entry *de;
223 struct f2fs_dentry_block *dentry_blk;
224
225 page = get_lock_data_page(dir, 0);
226 if (IS_ERR(page))
227 return NULL;
228
229 dentry_blk = kmap(page);
230 de = &dentry_blk->dentry[1];
231 *p = page;
232 unlock_page(page);
233 return de;
234}
235
236ino_t f2fs_inode_by_name(struct inode *dir, struct qstr *qstr)
237{
238 ino_t res = 0;
239 struct f2fs_dir_entry *de;
240 struct page *page;
241
242 de = f2fs_find_entry(dir, qstr, &page);
243 if (de) {
244 res = le32_to_cpu(de->ino);
245 kunmap(page);
246 f2fs_put_page(page, 0);
247 }
248
249 return res;
250}
251
252void f2fs_set_link(struct inode *dir, struct f2fs_dir_entry *de,
253 struct page *page, struct inode *inode)
254{
255 lock_page(page);
256 f2fs_wait_on_page_writeback(page, DATA);
257 de->ino = cpu_to_le32(inode->i_ino);
258 set_de_type(de, inode);
259 kunmap(page);
260 set_page_dirty(page);
261 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
262 mark_inode_dirty(dir);
263
264 f2fs_put_page(page, 1);
265}
266
267static void init_dent_inode(const struct qstr *name, struct page *ipage)
268{
269 struct f2fs_inode *ri;
270
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);
276}
277
278int update_dent_inode(struct inode *inode, const struct qstr *name)
279{
280 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
281 struct page *page;
282
283 page = get_node_page(sbi, inode->i_ino);
284 if (IS_ERR(page))
285 return PTR_ERR(page);
286
287 init_dent_inode(name, page);
288 f2fs_put_page(page, 1);
289
290 return 0;
291}
292
293static int make_empty_dir(struct inode *inode,
294 struct inode *parent, struct page *page)
295{
296 struct page *dentry_page;
297 struct f2fs_dentry_block *dentry_blk;
298 struct f2fs_dir_entry *de;
299 void *kaddr;
300
301 dentry_page = get_new_data_page(inode, page, 0, true);
302 if (IS_ERR(dentry_page))
303 return PTR_ERR(dentry_page);
304
305 kaddr = kmap_atomic(dentry_page);
306 dentry_blk = (struct f2fs_dentry_block *)kaddr;
307
308 de = &dentry_blk->dentry[0];
309 de->name_len = cpu_to_le16(1);
310 de->hash_code = 0;
311 de->ino = cpu_to_le32(inode->i_ino);
312 memcpy(dentry_blk->filename[0], ".", 1);
313 set_de_type(de, inode);
314
315 de = &dentry_blk->dentry[1];
316 de->hash_code = 0;
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);
321
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);
325
326 set_page_dirty(dentry_page);
327 f2fs_put_page(dentry_page, 1);
328 return 0;
329}
330
331static struct page *init_inode_metadata(struct inode *inode,
332 struct inode *dir, const struct qstr *name)
333{
334 struct page *page;
335 int err;
336
337 if (is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) {
338 page = new_inode_page(inode, name);
339 if (IS_ERR(page))
340 return page;
341
342 if (S_ISDIR(inode->i_mode)) {
343 err = make_empty_dir(inode, dir, page);
344 if (err)
345 goto error;
346 }
347
348 err = f2fs_init_acl(inode, dir, page);
349 if (err)
350 goto put_error;
351
352 err = f2fs_init_security(inode, dir, name, page);
353 if (err)
354 goto put_error;
355 } else {
356 page = get_node_page(F2FS_SB(dir->i_sb), inode->i_ino);
357 if (IS_ERR(page))
358 return page;
359
360 set_cold_node(inode, page);
361 }
362
363 init_dent_inode(name, page);
364
365 /*
366 * This file should be checkpointed during fsync.
367 * We lost i_pino from now on.
368 */
369 if (is_inode_flag_set(F2FS_I(inode), FI_INC_LINK)) {
370 file_lost_pino(inode);
371 inc_nlink(inode);
372 }
373 return page;
374
375put_error:
376 f2fs_put_page(page, 1);
377 /* once the failed inode becomes a bad inode, i_mode is S_IFREG */
378 truncate_inode_pages(&inode->i_data, 0);
379 truncate_blocks(inode, 0);
380 remove_dirty_dir_inode(inode);
381error:
382 remove_inode_page(inode);
383 return ERR_PTR(err);
384}
385
386static void update_parent_metadata(struct inode *dir, struct inode *inode,
387 unsigned int current_depth)
388{
389 if (is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) {
390 if (S_ISDIR(inode->i_mode)) {
391 inc_nlink(dir);
392 set_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
393 }
394 clear_inode_flag(F2FS_I(inode), FI_NEW_INODE);
395 }
396 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
397 mark_inode_dirty(dir);
398
399 if (F2FS_I(dir)->i_current_depth != current_depth) {
400 F2FS_I(dir)->i_current_depth = current_depth;
401 set_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
402 }
403
404 if (is_inode_flag_set(F2FS_I(inode), FI_INC_LINK))
405 clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
406}
407
408static int room_for_filename(struct f2fs_dentry_block *dentry_blk, int slots)
409{
410 int bit_start = 0;
411 int zero_start, zero_end;
412next:
413 zero_start = find_next_zero_bit_le(&dentry_blk->dentry_bitmap,
414 NR_DENTRY_IN_BLOCK,
415 bit_start);
416 if (zero_start >= NR_DENTRY_IN_BLOCK)
417 return NR_DENTRY_IN_BLOCK;
418
419 zero_end = find_next_bit_le(&dentry_blk->dentry_bitmap,
420 NR_DENTRY_IN_BLOCK,
421 zero_start);
422 if (zero_end - zero_start >= slots)
423 return zero_start;
424
425 bit_start = zero_end + 1;
426
427 if (zero_end + 1 >= NR_DENTRY_IN_BLOCK)
428 return NR_DENTRY_IN_BLOCK;
429 goto next;
430}
431
432/*
433 * Caller should grab and release a rwsem by calling f2fs_lock_op() and
434 * f2fs_unlock_op().
435 */
436int __f2fs_add_link(struct inode *dir, const struct qstr *name,
437 struct inode *inode)
438{
439 unsigned int bit_pos;
440 unsigned int level;
441 unsigned int current_depth;
442 unsigned long bidx, block;
443 f2fs_hash_t dentry_hash;
444 struct f2fs_dir_entry *de;
445 unsigned int nbucket, nblock;
446 size_t namelen = name->len;
447 struct page *dentry_page = NULL;
448 struct f2fs_dentry_block *dentry_blk = NULL;
449 int slots = GET_DENTRY_SLOTS(namelen);
450 struct page *page;
451 int err = 0;
452 int i;
453
454 dentry_hash = f2fs_dentry_hash(name->name, name->len);
455 level = 0;
456 current_depth = F2FS_I(dir)->i_current_depth;
457 if (F2FS_I(dir)->chash == dentry_hash) {
458 level = F2FS_I(dir)->clevel;
459 F2FS_I(dir)->chash = 0;
460 }
461
462start:
463 if (unlikely(current_depth == MAX_DIR_HASH_DEPTH))
464 return -ENOSPC;
465
466 /* Increase the depth, if required */
467 if (level == current_depth)
468 ++current_depth;
469
470 nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level);
471 nblock = bucket_blocks(level);
472
473 bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level,
474 (le32_to_cpu(dentry_hash) % nbucket));
475
476 for (block = bidx; block <= (bidx + nblock - 1); block++) {
477 dentry_page = get_new_data_page(dir, NULL, block, true);
478 if (IS_ERR(dentry_page))
479 return PTR_ERR(dentry_page);
480
481 dentry_blk = kmap(dentry_page);
482 bit_pos = room_for_filename(dentry_blk, slots);
483 if (bit_pos < NR_DENTRY_IN_BLOCK)
484 goto add_dentry;
485
486 kunmap(dentry_page);
487 f2fs_put_page(dentry_page, 1);
488 }
489
490 /* Move to next level to find the empty slot for new dentry */
491 ++level;
492 goto start;
493add_dentry:
494 f2fs_wait_on_page_writeback(dentry_page, DATA);
495
496 down_write(&F2FS_I(inode)->i_sem);
497 page = init_inode_metadata(inode, dir, name);
498 if (IS_ERR(page)) {
499 err = PTR_ERR(page);
500 goto fail;
501 }
502 de = &dentry_blk->dentry[bit_pos];
503 de->hash_code = dentry_hash;
504 de->name_len = cpu_to_le16(namelen);
505 memcpy(dentry_blk->filename[bit_pos], name->name, name->len);
506 de->ino = cpu_to_le32(inode->i_ino);
507 set_de_type(de, inode);
508 for (i = 0; i < slots; i++)
509 test_and_set_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap);
510 set_page_dirty(dentry_page);
511
512 /* we don't need to mark_inode_dirty now */
513 F2FS_I(inode)->i_pino = dir->i_ino;
514 update_inode(inode, page);
515 f2fs_put_page(page, 1);
516
517 update_parent_metadata(dir, inode, current_depth);
518fail:
519 up_write(&F2FS_I(inode)->i_sem);
520
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);
524 }
525 kunmap(dentry_page);
526 f2fs_put_page(dentry_page, 1);
527 return err;
528}
529
530/*
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.
533 */
534void f2fs_delete_entry(struct f2fs_dir_entry *dentry, struct page *page,
535 struct inode *inode)
536{
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);
543 int i;
544
545 lock_page(page);
546 f2fs_wait_on_page_writeback(page, DATA);
547
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);
552
553 /* Let's check and deallocate this dentry page */
554 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
555 NR_DENTRY_IN_BLOCK,
556 0);
557 kunmap(page); /* kunmap - pair of f2fs_find_entry */
558 set_page_dirty(page);
559
560 dir->i_ctime = dir->i_mtime = CURRENT_TIME;
561
562 if (inode) {
563 struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
564
565 down_write(&F2FS_I(inode)->i_sem);
566
567 if (S_ISDIR(inode->i_mode)) {
568 drop_nlink(dir);
569 update_inode_page(dir);
570 }
571 inode->i_ctime = CURRENT_TIME;
572 drop_nlink(inode);
573 if (S_ISDIR(inode->i_mode)) {
574 drop_nlink(inode);
575 i_size_write(inode, 0);
576 }
577 up_write(&F2FS_I(inode)->i_sem);
578 update_inode_page(inode);
579
580 if (inode->i_nlink == 0)
581 add_orphan_inode(sbi, inode->i_ino);
582 else
583 release_orphan_inode(sbi);
584 }
585
586 if (bit_pos == NR_DENTRY_IN_BLOCK) {
587 truncate_hole(dir, page->index, page->index + 1);
588 clear_page_dirty_for_io(page);
589 ClearPageUptodate(page);
590 inode_dec_dirty_dents(dir);
591 }
592 f2fs_put_page(page, 1);
593}
594
595bool f2fs_empty_dir(struct inode *dir)
596{
597 unsigned long bidx;
598 struct page *dentry_page;
599 unsigned int bit_pos;
600 struct f2fs_dentry_block *dentry_blk;
601 unsigned long nblock = dir_blocks(dir);
602
603 for (bidx = 0; bidx < nblock; bidx++) {
604 void *kaddr;
605 dentry_page = get_lock_data_page(dir, bidx);
606 if (IS_ERR(dentry_page)) {
607 if (PTR_ERR(dentry_page) == -ENOENT)
608 continue;
609 else
610 return false;
611 }
612
613 kaddr = kmap_atomic(dentry_page);
614 dentry_blk = (struct f2fs_dentry_block *)kaddr;
615 if (bidx == 0)
616 bit_pos = 2;
617 else
618 bit_pos = 0;
619 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
620 NR_DENTRY_IN_BLOCK,
621 bit_pos);
622 kunmap_atomic(kaddr);
623
624 f2fs_put_page(dentry_page, 1);
625
626 if (bit_pos < NR_DENTRY_IN_BLOCK)
627 return false;
628 }
629 return true;
630}
631
632static int f2fs_readdir(struct file *file, struct dir_context *ctx)
633{
634 struct inode *inode = file_inode(file);
635 unsigned long npages = dir_blocks(inode);
636 unsigned int bit_pos = 0;
637 struct f2fs_dentry_block *dentry_blk = NULL;
638 struct f2fs_dir_entry *de = NULL;
639 struct page *dentry_page = NULL;
640 unsigned int n = ((unsigned long)ctx->pos / NR_DENTRY_IN_BLOCK);
641 unsigned char d_type = DT_UNKNOWN;
642
643 bit_pos = ((unsigned long)ctx->pos % NR_DENTRY_IN_BLOCK);
644
645 for (; n < npages; n++) {
646 dentry_page = get_lock_data_page(inode, n);
647 if (IS_ERR(dentry_page))
648 continue;
649
650 dentry_blk = kmap(dentry_page);
651 while (bit_pos < NR_DENTRY_IN_BLOCK) {
652 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
653 NR_DENTRY_IN_BLOCK,
654 bit_pos);
655 if (bit_pos >= NR_DENTRY_IN_BLOCK)
656 break;
657
658 de = &dentry_blk->dentry[bit_pos];
659 if (de->file_type < F2FS_FT_MAX)
660 d_type = f2fs_filetype_table[de->file_type];
661 else
662 d_type = DT_UNKNOWN;
663 if (!dir_emit(ctx,
664 dentry_blk->filename[bit_pos],
665 le16_to_cpu(de->name_len),
666 le32_to_cpu(de->ino), d_type))
667 goto stop;
668
669 bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
670 ctx->pos = n * NR_DENTRY_IN_BLOCK + bit_pos;
671 }
672 bit_pos = 0;
673 ctx->pos = (n + 1) * NR_DENTRY_IN_BLOCK;
674 kunmap(dentry_page);
675 f2fs_put_page(dentry_page, 1);
676 dentry_page = NULL;
677 }
678stop:
679 if (dentry_page && !IS_ERR(dentry_page)) {
680 kunmap(dentry_page);
681 f2fs_put_page(dentry_page, 1);
682 }
683
684 return 0;
685}
686
687const struct file_operations f2fs_dir_operations = {
688 .llseek = generic_file_llseek,
689 .read = generic_read_dir,
690 .iterate = f2fs_readdir,
691 .fsync = f2fs_sync_file,
692 .unlocked_ioctl = f2fs_ioctl,
693};