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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 <linux/sched/signal.h>
14#include "f2fs.h"
15#include "node.h"
16#include "acl.h"
17#include "xattr.h"
18#include <trace/events/f2fs.h>
19
20static unsigned long dir_blocks(struct inode *inode)
21{
22 return ((unsigned long long) (i_size_read(inode) + PAGE_SIZE - 1))
23 >> PAGE_SHIFT;
24}
25
26static unsigned int dir_buckets(unsigned int level, int dir_level)
27{
28 if (level + dir_level < MAX_DIR_HASH_DEPTH / 2)
29 return 1 << (level + dir_level);
30 else
31 return MAX_DIR_BUCKETS;
32}
33
34static unsigned int bucket_blocks(unsigned int level)
35{
36 if (level < MAX_DIR_HASH_DEPTH / 2)
37 return 2;
38 else
39 return 4;
40}
41
42static unsigned char f2fs_filetype_table[F2FS_FT_MAX] = {
43 [F2FS_FT_UNKNOWN] = DT_UNKNOWN,
44 [F2FS_FT_REG_FILE] = DT_REG,
45 [F2FS_FT_DIR] = DT_DIR,
46 [F2FS_FT_CHRDEV] = DT_CHR,
47 [F2FS_FT_BLKDEV] = DT_BLK,
48 [F2FS_FT_FIFO] = DT_FIFO,
49 [F2FS_FT_SOCK] = DT_SOCK,
50 [F2FS_FT_SYMLINK] = DT_LNK,
51};
52
53static unsigned char f2fs_type_by_mode[S_IFMT >> S_SHIFT] = {
54 [S_IFREG >> S_SHIFT] = F2FS_FT_REG_FILE,
55 [S_IFDIR >> S_SHIFT] = F2FS_FT_DIR,
56 [S_IFCHR >> S_SHIFT] = F2FS_FT_CHRDEV,
57 [S_IFBLK >> S_SHIFT] = F2FS_FT_BLKDEV,
58 [S_IFIFO >> S_SHIFT] = F2FS_FT_FIFO,
59 [S_IFSOCK >> S_SHIFT] = F2FS_FT_SOCK,
60 [S_IFLNK >> S_SHIFT] = F2FS_FT_SYMLINK,
61};
62
63void set_de_type(struct f2fs_dir_entry *de, umode_t mode)
64{
65 de->file_type = f2fs_type_by_mode[(mode & S_IFMT) >> S_SHIFT];
66}
67
68unsigned char get_de_type(struct f2fs_dir_entry *de)
69{
70 if (de->file_type < F2FS_FT_MAX)
71 return f2fs_filetype_table[de->file_type];
72 return DT_UNKNOWN;
73}
74
75static unsigned long dir_block_index(unsigned int level,
76 int dir_level, unsigned int idx)
77{
78 unsigned long i;
79 unsigned long bidx = 0;
80
81 for (i = 0; i < level; i++)
82 bidx += dir_buckets(i, dir_level) * bucket_blocks(i);
83 bidx += idx * bucket_blocks(level);
84 return bidx;
85}
86
87static struct f2fs_dir_entry *find_in_block(struct page *dentry_page,
88 struct fscrypt_name *fname,
89 f2fs_hash_t namehash,
90 int *max_slots,
91 struct page **res_page)
92{
93 struct f2fs_dentry_block *dentry_blk;
94 struct f2fs_dir_entry *de;
95 struct f2fs_dentry_ptr d;
96
97 dentry_blk = (struct f2fs_dentry_block *)page_address(dentry_page);
98
99 make_dentry_ptr_block(NULL, &d, dentry_blk);
100 de = find_target_dentry(fname, namehash, max_slots, &d);
101 if (de)
102 *res_page = dentry_page;
103
104 return de;
105}
106
107struct 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
115 if (max_slots)
116 *max_slots = 0;
117 while (bit_pos < d->max) {
118 if (!test_bit_le(bit_pos, d->bitmap)) {
119 bit_pos++;
120 max_len++;
121 continue;
122 }
123
124 de = &d->dentry[bit_pos];
125
126 if (unlikely(!de->name_len)) {
127 bit_pos++;
128 continue;
129 }
130
131 if (de->hash_code == namehash &&
132 fscrypt_match_name(fname, d->filename[bit_pos],
133 le16_to_cpu(de->name_len)))
134 goto found;
135
136 if (max_slots && max_len > *max_slots)
137 *max_slots = max_len;
138 max_len = 0;
139
140 bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
141 }
142
143 de = NULL;
144found:
145 if (max_slots && max_len > *max_slots)
146 *max_slots = max_len;
147 return de;
148}
149
150static struct f2fs_dir_entry *find_in_level(struct inode *dir,
151 unsigned int level,
152 struct fscrypt_name *fname,
153 struct page **res_page)
154{
155 struct qstr name = FSTR_TO_QSTR(&fname->disk_name);
156 int s = GET_DENTRY_SLOTS(name.len);
157 unsigned int nbucket, nblock;
158 unsigned int bidx, end_block;
159 struct page *dentry_page;
160 struct f2fs_dir_entry *de = NULL;
161 bool room = false;
162 int max_slots;
163 f2fs_hash_t namehash = f2fs_dentry_hash(&name, fname);
164
165 nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level);
166 nblock = bucket_blocks(level);
167
168 bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level,
169 le32_to_cpu(namehash) % nbucket);
170 end_block = bidx + nblock;
171
172 for (; bidx < end_block; bidx++) {
173 /* no need to allocate new dentry pages to all the indices */
174 dentry_page = find_data_page(dir, bidx);
175 if (IS_ERR(dentry_page)) {
176 if (PTR_ERR(dentry_page) == -ENOENT) {
177 room = true;
178 continue;
179 } else {
180 *res_page = dentry_page;
181 break;
182 }
183 }
184
185 de = find_in_block(dentry_page, fname, namehash, &max_slots,
186 res_page);
187 if (de)
188 break;
189
190 if (max_slots >= s)
191 room = true;
192 f2fs_put_page(dentry_page, 0);
193 }
194
195 if (!de && room && F2FS_I(dir)->chash != namehash) {
196 F2FS_I(dir)->chash = namehash;
197 F2FS_I(dir)->clevel = level;
198 }
199
200 return de;
201}
202
203struct f2fs_dir_entry *__f2fs_find_entry(struct inode *dir,
204 struct fscrypt_name *fname, struct page **res_page)
205{
206 unsigned long npages = dir_blocks(dir);
207 struct f2fs_dir_entry *de = NULL;
208 unsigned int max_depth;
209 unsigned int level;
210
211 if (f2fs_has_inline_dentry(dir)) {
212 *res_page = NULL;
213 de = find_in_inline_dir(dir, fname, res_page);
214 goto out;
215 }
216
217 if (npages == 0) {
218 *res_page = NULL;
219 goto out;
220 }
221
222 max_depth = F2FS_I(dir)->i_current_depth;
223 if (unlikely(max_depth > MAX_DIR_HASH_DEPTH)) {
224 f2fs_msg(F2FS_I_SB(dir)->sb, KERN_WARNING,
225 "Corrupted max_depth of %lu: %u",
226 dir->i_ino, max_depth);
227 max_depth = MAX_DIR_HASH_DEPTH;
228 f2fs_i_depth_write(dir, max_depth);
229 }
230
231 for (level = 0; level < max_depth; level++) {
232 *res_page = NULL;
233 de = find_in_level(dir, level, fname, res_page);
234 if (de || IS_ERR(*res_page))
235 break;
236 }
237out:
238 /* This is to increase the speed of f2fs_create */
239 if (!de)
240 F2FS_I(dir)->task = current;
241 return de;
242}
243
244/*
245 * Find an entry in the specified directory with the wanted name.
246 * It returns the page where the entry was found (as a parameter - res_page),
247 * and the entry itself. Page is returned mapped and unlocked.
248 * Entry is guaranteed to be valid.
249 */
250struct f2fs_dir_entry *f2fs_find_entry(struct inode *dir,
251 const struct qstr *child, struct page **res_page)
252{
253 struct f2fs_dir_entry *de = NULL;
254 struct fscrypt_name fname;
255 int err;
256
257 err = fscrypt_setup_filename(dir, child, 1, &fname);
258 if (err) {
259 if (err == -ENOENT)
260 *res_page = NULL;
261 else
262 *res_page = ERR_PTR(err);
263 return NULL;
264 }
265
266 de = __f2fs_find_entry(dir, &fname, res_page);
267
268 fscrypt_free_filename(&fname);
269 return de;
270}
271
272struct f2fs_dir_entry *f2fs_parent_dir(struct inode *dir, struct page **p)
273{
274 struct qstr dotdot = QSTR_INIT("..", 2);
275
276 return f2fs_find_entry(dir, &dotdot, p);
277}
278
279ino_t f2fs_inode_by_name(struct inode *dir, const struct qstr *qstr,
280 struct page **page)
281{
282 ino_t res = 0;
283 struct f2fs_dir_entry *de;
284
285 de = f2fs_find_entry(dir, qstr, page);
286 if (de) {
287 res = le32_to_cpu(de->ino);
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 set_page_dirty(page);
303
304 dir->i_mtime = dir->i_ctime = current_time(dir);
305 f2fs_mark_inode_dirty_sync(dir, false);
306 f2fs_put_page(page, 1);
307}
308
309static void init_dent_inode(const struct qstr *name, struct page *ipage)
310{
311 struct f2fs_inode *ri;
312
313 f2fs_wait_on_page_writeback(ipage, NODE, true);
314
315 /* copy name info. to this inode page */
316 ri = F2FS_INODE(ipage);
317 ri->i_namelen = cpu_to_le32(name->len);
318 memcpy(ri->i_name, name->name, name->len);
319 set_page_dirty(ipage);
320}
321
322void do_make_empty_dir(struct inode *inode, struct inode *parent,
323 struct f2fs_dentry_ptr *d)
324{
325 struct qstr dot = QSTR_INIT(".", 1);
326 struct qstr dotdot = QSTR_INIT("..", 2);
327
328 /* update dirent of "." */
329 f2fs_update_dentry(inode->i_ino, inode->i_mode, d, &dot, 0, 0);
330
331 /* update dirent of ".." */
332 f2fs_update_dentry(parent->i_ino, parent->i_mode, d, &dotdot, 0, 1);
333}
334
335static int make_empty_dir(struct inode *inode,
336 struct inode *parent, struct page *page)
337{
338 struct page *dentry_page;
339 struct f2fs_dentry_block *dentry_blk;
340 struct f2fs_dentry_ptr d;
341
342 if (f2fs_has_inline_dentry(inode))
343 return make_empty_inline_dir(inode, parent, page);
344
345 dentry_page = get_new_data_page(inode, page, 0, true);
346 if (IS_ERR(dentry_page))
347 return PTR_ERR(dentry_page);
348
349 dentry_blk = page_address(dentry_page);
350
351 make_dentry_ptr_block(NULL, &d, dentry_blk);
352 do_make_empty_dir(inode, parent, &d);
353
354 set_page_dirty(dentry_page);
355 f2fs_put_page(dentry_page, 1);
356 return 0;
357}
358
359struct page *init_inode_metadata(struct inode *inode, struct inode *dir,
360 const struct qstr *new_name, const struct qstr *orig_name,
361 struct page *dpage)
362{
363 struct page *page;
364 int dummy_encrypt = DUMMY_ENCRYPTION_ENABLED(F2FS_I_SB(dir));
365 int err;
366
367 if (is_inode_flag_set(inode, FI_NEW_INODE)) {
368 page = new_inode_page(inode);
369 if (IS_ERR(page))
370 return page;
371
372 if (S_ISDIR(inode->i_mode)) {
373 /* in order to handle error case */
374 get_page(page);
375 err = make_empty_dir(inode, dir, page);
376 if (err) {
377 lock_page(page);
378 goto put_error;
379 }
380 put_page(page);
381 }
382
383 err = f2fs_init_acl(inode, dir, page, dpage);
384 if (err)
385 goto put_error;
386
387 err = f2fs_init_security(inode, dir, orig_name, page);
388 if (err)
389 goto put_error;
390
391 if ((f2fs_encrypted_inode(dir) || dummy_encrypt) &&
392 f2fs_may_encrypt(inode)) {
393 err = fscrypt_inherit_context(dir, inode, page, false);
394 if (err)
395 goto put_error;
396 }
397 } else {
398 page = get_node_page(F2FS_I_SB(dir), inode->i_ino);
399 if (IS_ERR(page))
400 return page;
401 }
402
403 if (new_name) {
404 init_dent_inode(new_name, page);
405 if (f2fs_encrypted_inode(dir))
406 file_set_enc_name(inode);
407 }
408
409 /*
410 * This file should be checkpointed during fsync.
411 * We lost i_pino from now on.
412 */
413 if (is_inode_flag_set(inode, FI_INC_LINK)) {
414 if (!S_ISDIR(inode->i_mode))
415 file_lost_pino(inode);
416 /*
417 * If link the tmpfile to alias through linkat path,
418 * we should remove this inode from orphan list.
419 */
420 if (inode->i_nlink == 0)
421 remove_orphan_inode(F2FS_I_SB(dir), inode->i_ino);
422 f2fs_i_links_write(inode, true);
423 }
424 return page;
425
426put_error:
427 clear_nlink(inode);
428 update_inode(inode, page);
429 f2fs_put_page(page, 1);
430 return ERR_PTR(err);
431}
432
433void update_parent_metadata(struct inode *dir, struct inode *inode,
434 unsigned int current_depth)
435{
436 if (inode && is_inode_flag_set(inode, FI_NEW_INODE)) {
437 if (S_ISDIR(inode->i_mode))
438 f2fs_i_links_write(dir, true);
439 clear_inode_flag(inode, FI_NEW_INODE);
440 }
441 dir->i_mtime = dir->i_ctime = current_time(dir);
442 f2fs_mark_inode_dirty_sync(dir, false);
443
444 if (F2FS_I(dir)->i_current_depth != current_depth)
445 f2fs_i_depth_write(dir, current_depth);
446
447 if (inode && is_inode_flag_set(inode, FI_INC_LINK))
448 clear_inode_flag(inode, FI_INC_LINK);
449}
450
451int room_for_filename(const void *bitmap, int slots, int max_slots)
452{
453 int bit_start = 0;
454 int zero_start, zero_end;
455next:
456 zero_start = find_next_zero_bit_le(bitmap, max_slots, bit_start);
457 if (zero_start >= max_slots)
458 return max_slots;
459
460 zero_end = find_next_bit_le(bitmap, max_slots, zero_start);
461 if (zero_end - zero_start >= slots)
462 return zero_start;
463
464 bit_start = zero_end + 1;
465
466 if (zero_end + 1 >= max_slots)
467 return max_slots;
468 goto next;
469}
470
471void f2fs_update_dentry(nid_t ino, umode_t mode, struct f2fs_dentry_ptr *d,
472 const struct qstr *name, f2fs_hash_t name_hash,
473 unsigned int bit_pos)
474{
475 struct f2fs_dir_entry *de;
476 int slots = GET_DENTRY_SLOTS(name->len);
477 int i;
478
479 de = &d->dentry[bit_pos];
480 de->hash_code = name_hash;
481 de->name_len = cpu_to_le16(name->len);
482 memcpy(d->filename[bit_pos], name->name, name->len);
483 de->ino = cpu_to_le32(ino);
484 set_de_type(de, mode);
485 for (i = 0; i < slots; i++) {
486 __set_bit_le(bit_pos + i, (void *)d->bitmap);
487 /* avoid wrong garbage data for readdir */
488 if (i)
489 (de + i)->name_len = 0;
490 }
491}
492
493int f2fs_add_regular_entry(struct inode *dir, const struct qstr *new_name,
494 const struct qstr *orig_name,
495 struct inode *inode, nid_t ino, umode_t mode)
496{
497 unsigned int bit_pos;
498 unsigned int level;
499 unsigned int current_depth;
500 unsigned long bidx, block;
501 f2fs_hash_t dentry_hash;
502 unsigned int nbucket, nblock;
503 struct page *dentry_page = NULL;
504 struct f2fs_dentry_block *dentry_blk = NULL;
505 struct f2fs_dentry_ptr d;
506 struct page *page = NULL;
507 int slots, err = 0;
508
509 level = 0;
510 slots = GET_DENTRY_SLOTS(new_name->len);
511 dentry_hash = f2fs_dentry_hash(new_name, NULL);
512
513 current_depth = F2FS_I(dir)->i_current_depth;
514 if (F2FS_I(dir)->chash == dentry_hash) {
515 level = F2FS_I(dir)->clevel;
516 F2FS_I(dir)->chash = 0;
517 }
518
519start:
520#ifdef CONFIG_F2FS_FAULT_INJECTION
521 if (time_to_inject(F2FS_I_SB(dir), FAULT_DIR_DEPTH)) {
522 f2fs_show_injection_info(FAULT_DIR_DEPTH);
523 return -ENOSPC;
524 }
525#endif
526 if (unlikely(current_depth == MAX_DIR_HASH_DEPTH))
527 return -ENOSPC;
528
529 /* Increase the depth, if required */
530 if (level == current_depth)
531 ++current_depth;
532
533 nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level);
534 nblock = bucket_blocks(level);
535
536 bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level,
537 (le32_to_cpu(dentry_hash) % nbucket));
538
539 for (block = bidx; block <= (bidx + nblock - 1); block++) {
540 dentry_page = get_new_data_page(dir, NULL, block, true);
541 if (IS_ERR(dentry_page))
542 return PTR_ERR(dentry_page);
543
544 dentry_blk = page_address(dentry_page);
545 bit_pos = room_for_filename(&dentry_blk->dentry_bitmap,
546 slots, NR_DENTRY_IN_BLOCK);
547 if (bit_pos < NR_DENTRY_IN_BLOCK)
548 goto add_dentry;
549
550 f2fs_put_page(dentry_page, 1);
551 }
552
553 /* Move to next level to find the empty slot for new dentry */
554 ++level;
555 goto start;
556add_dentry:
557 f2fs_wait_on_page_writeback(dentry_page, DATA, true);
558
559 if (inode) {
560 down_write(&F2FS_I(inode)->i_sem);
561 page = init_inode_metadata(inode, dir, new_name,
562 orig_name, NULL);
563 if (IS_ERR(page)) {
564 err = PTR_ERR(page);
565 goto fail;
566 }
567 }
568
569 make_dentry_ptr_block(NULL, &d, dentry_blk);
570 f2fs_update_dentry(ino, mode, &d, new_name, dentry_hash, bit_pos);
571
572 set_page_dirty(dentry_page);
573
574 if (inode) {
575 f2fs_i_pino_write(inode, dir->i_ino);
576 f2fs_put_page(page, 1);
577 }
578
579 update_parent_metadata(dir, inode, current_depth);
580fail:
581 if (inode)
582 up_write(&F2FS_I(inode)->i_sem);
583
584 f2fs_put_page(dentry_page, 1);
585
586 return err;
587}
588
589int __f2fs_do_add_link(struct inode *dir, struct fscrypt_name *fname,
590 struct inode *inode, nid_t ino, umode_t mode)
591{
592 struct qstr new_name;
593 int err = -EAGAIN;
594
595 new_name.name = fname_name(fname);
596 new_name.len = fname_len(fname);
597
598 if (f2fs_has_inline_dentry(dir))
599 err = f2fs_add_inline_entry(dir, &new_name, fname->usr_fname,
600 inode, ino, mode);
601 if (err == -EAGAIN)
602 err = f2fs_add_regular_entry(dir, &new_name, fname->usr_fname,
603 inode, ino, mode);
604
605 f2fs_update_time(F2FS_I_SB(dir), REQ_TIME);
606 return err;
607}
608
609/*
610 * Caller should grab and release a rwsem by calling f2fs_lock_op() and
611 * f2fs_unlock_op().
612 */
613int __f2fs_add_link(struct inode *dir, const struct qstr *name,
614 struct inode *inode, nid_t ino, umode_t mode)
615{
616 struct fscrypt_name fname;
617 struct page *page = NULL;
618 struct f2fs_dir_entry *de = NULL;
619 int err;
620
621 err = fscrypt_setup_filename(dir, name, 0, &fname);
622 if (err)
623 return err;
624
625 /*
626 * An immature stakable filesystem shows a race condition between lookup
627 * and create. If we have same task when doing lookup and create, it's
628 * definitely fine as expected by VFS normally. Otherwise, let's just
629 * verify on-disk dentry one more time, which guarantees filesystem
630 * consistency more.
631 */
632 if (current != F2FS_I(dir)->task) {
633 de = __f2fs_find_entry(dir, &fname, &page);
634 F2FS_I(dir)->task = NULL;
635 }
636 if (de) {
637 f2fs_put_page(page, 0);
638 err = -EEXIST;
639 } else if (IS_ERR(page)) {
640 err = PTR_ERR(page);
641 } else {
642 err = __f2fs_do_add_link(dir, &fname, inode, ino, mode);
643 }
644 fscrypt_free_filename(&fname);
645 return err;
646}
647
648int f2fs_do_tmpfile(struct inode *inode, struct inode *dir)
649{
650 struct page *page;
651 int err = 0;
652
653 down_write(&F2FS_I(inode)->i_sem);
654 page = init_inode_metadata(inode, dir, NULL, NULL, NULL);
655 if (IS_ERR(page)) {
656 err = PTR_ERR(page);
657 goto fail;
658 }
659 f2fs_put_page(page, 1);
660
661 clear_inode_flag(inode, FI_NEW_INODE);
662fail:
663 up_write(&F2FS_I(inode)->i_sem);
664 f2fs_update_time(F2FS_I_SB(inode), REQ_TIME);
665 return err;
666}
667
668void f2fs_drop_nlink(struct inode *dir, struct inode *inode)
669{
670 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
671
672 down_write(&F2FS_I(inode)->i_sem);
673
674 if (S_ISDIR(inode->i_mode))
675 f2fs_i_links_write(dir, false);
676 inode->i_ctime = current_time(inode);
677
678 f2fs_i_links_write(inode, false);
679 if (S_ISDIR(inode->i_mode)) {
680 f2fs_i_links_write(inode, false);
681 f2fs_i_size_write(inode, 0);
682 }
683 up_write(&F2FS_I(inode)->i_sem);
684
685 if (inode->i_nlink == 0)
686 add_orphan_inode(inode);
687 else
688 release_orphan_inode(sbi);
689}
690
691/*
692 * It only removes the dentry from the dentry page, corresponding name
693 * entry in name page does not need to be touched during deletion.
694 */
695void f2fs_delete_entry(struct f2fs_dir_entry *dentry, struct page *page,
696 struct inode *dir, struct inode *inode)
697{
698 struct f2fs_dentry_block *dentry_blk;
699 unsigned int bit_pos;
700 int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len));
701 struct address_space *mapping = page_mapping(page);
702 unsigned long flags;
703 int i;
704
705 f2fs_update_time(F2FS_I_SB(dir), REQ_TIME);
706
707 if (F2FS_OPTION(F2FS_I_SB(dir)).fsync_mode == FSYNC_MODE_STRICT)
708 add_ino_entry(F2FS_I_SB(dir), dir->i_ino, TRANS_DIR_INO);
709
710 if (f2fs_has_inline_dentry(dir))
711 return f2fs_delete_inline_entry(dentry, page, dir, inode);
712
713 lock_page(page);
714 f2fs_wait_on_page_writeback(page, DATA, true);
715
716 dentry_blk = page_address(page);
717 bit_pos = dentry - dentry_blk->dentry;
718 for (i = 0; i < slots; i++)
719 __clear_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap);
720
721 /* Let's check and deallocate this dentry page */
722 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
723 NR_DENTRY_IN_BLOCK,
724 0);
725 set_page_dirty(page);
726
727 dir->i_ctime = dir->i_mtime = current_time(dir);
728 f2fs_mark_inode_dirty_sync(dir, false);
729
730 if (inode)
731 f2fs_drop_nlink(dir, inode);
732
733 if (bit_pos == NR_DENTRY_IN_BLOCK &&
734 !truncate_hole(dir, page->index, page->index + 1)) {
735 xa_lock_irqsave(&mapping->i_pages, flags);
736 radix_tree_tag_clear(&mapping->i_pages, page_index(page),
737 PAGECACHE_TAG_DIRTY);
738 xa_unlock_irqrestore(&mapping->i_pages, flags);
739
740 clear_page_dirty_for_io(page);
741 ClearPagePrivate(page);
742 ClearPageUptodate(page);
743 inode_dec_dirty_pages(dir);
744 remove_dirty_inode(dir);
745 }
746 f2fs_put_page(page, 1);
747}
748
749bool 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 = page_address(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
778 f2fs_put_page(dentry_page, 1);
779
780 if (bit_pos < NR_DENTRY_IN_BLOCK)
781 return false;
782 }
783 return true;
784}
785
786int f2fs_fill_dentries(struct dir_context *ctx, struct f2fs_dentry_ptr *d,
787 unsigned int start_pos, struct fscrypt_str *fstr)
788{
789 unsigned char d_type = DT_UNKNOWN;
790 unsigned int bit_pos;
791 struct f2fs_dir_entry *de = NULL;
792 struct fscrypt_str de_name = FSTR_INIT(NULL, 0);
793 struct f2fs_sb_info *sbi = F2FS_I_SB(d->inode);
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 err;
817
818 err = fscrypt_fname_disk_to_usr(d->inode,
819 (u32)de->hash_code, 0,
820 &de_name, fstr);
821 if (err)
822 return err;
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 1;
831
832 if (sbi->readdir_ra == 1)
833 ra_node_page(sbi, le32_to_cpu(de->ino));
834
835 bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
836 ctx->pos = start_pos + bit_pos;
837 }
838 return 0;
839}
840
841static int f2fs_readdir(struct file *file, struct dir_context *ctx)
842{
843 struct inode *inode = file_inode(file);
844 unsigned long npages = dir_blocks(inode);
845 struct f2fs_dentry_block *dentry_blk = NULL;
846 struct page *dentry_page = NULL;
847 struct file_ra_state *ra = &file->f_ra;
848 loff_t start_pos = ctx->pos;
849 unsigned int n = ((unsigned long)ctx->pos / NR_DENTRY_IN_BLOCK);
850 struct f2fs_dentry_ptr d;
851 struct fscrypt_str fstr = FSTR_INIT(NULL, 0);
852 int err = 0;
853
854 if (f2fs_encrypted_inode(inode)) {
855 err = fscrypt_get_encryption_info(inode);
856 if (err && err != -ENOKEY)
857 goto out;
858
859 err = fscrypt_fname_alloc_buffer(inode, F2FS_NAME_LEN, &fstr);
860 if (err < 0)
861 goto out;
862 }
863
864 if (f2fs_has_inline_dentry(inode)) {
865 err = f2fs_read_inline_dir(file, ctx, &fstr);
866 goto out_free;
867 }
868
869 for (; n < npages; n++, ctx->pos = n * NR_DENTRY_IN_BLOCK) {
870
871 /* allow readdir() to be interrupted */
872 if (fatal_signal_pending(current)) {
873 err = -ERESTARTSYS;
874 goto out_free;
875 }
876 cond_resched();
877
878 /* readahead for multi pages of dir */
879 if (npages - n > 1 && !ra_has_index(ra, n))
880 page_cache_sync_readahead(inode->i_mapping, ra, file, n,
881 min(npages - n, (pgoff_t)MAX_DIR_RA_PAGES));
882
883 dentry_page = get_lock_data_page(inode, n, false);
884 if (IS_ERR(dentry_page)) {
885 err = PTR_ERR(dentry_page);
886 if (err == -ENOENT) {
887 err = 0;
888 continue;
889 } else {
890 goto out_free;
891 }
892 }
893
894 dentry_blk = page_address(dentry_page);
895
896 make_dentry_ptr_block(inode, &d, dentry_blk);
897
898 err = f2fs_fill_dentries(ctx, &d,
899 n * NR_DENTRY_IN_BLOCK, &fstr);
900 if (err) {
901 f2fs_put_page(dentry_page, 1);
902 break;
903 }
904
905 f2fs_put_page(dentry_page, 1);
906 }
907out_free:
908 fscrypt_fname_free_buffer(&fstr);
909out:
910 trace_f2fs_readdir(inode, start_pos, ctx->pos, err);
911 return err < 0 ? err : 0;
912}
913
914static int f2fs_dir_open(struct inode *inode, struct file *filp)
915{
916 if (f2fs_encrypted_inode(inode))
917 return fscrypt_get_encryption_info(inode) ? -EACCES : 0;
918 return 0;
919}
920
921const struct file_operations f2fs_dir_operations = {
922 .llseek = generic_file_llseek,
923 .read = generic_read_dir,
924 .iterate_shared = f2fs_readdir,
925 .fsync = f2fs_sync_file,
926 .open = f2fs_dir_open,
927 .unlocked_ioctl = f2fs_ioctl,
928#ifdef CONFIG_COMPAT
929 .compat_ioctl = f2fs_compat_ioctl,
930#endif
931};