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1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * fs/f2fs/dir.c
4 *
5 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
6 * http://www.samsung.com/
7 */
8 #include <linux/fs.h>
9 #include <linux/f2fs_fs.h>
10 #include <linux/sched/signal.h>
11 #include <linux/unicode.h>
12 #include "f2fs.h"
13 #include "node.h"
14 #include "acl.h"
15 #include "xattr.h"
16 #include <trace/events/f2fs.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 static unsigned char f2fs_filetype_table[F2FS_FT_MAX] = {
41 [F2FS_FT_UNKNOWN] = DT_UNKNOWN,
42 [F2FS_FT_REG_FILE] = DT_REG,
43 [F2FS_FT_DIR] = DT_DIR,
44 [F2FS_FT_CHRDEV] = DT_CHR,
45 [F2FS_FT_BLKDEV] = DT_BLK,
46 [F2FS_FT_FIFO] = DT_FIFO,
47 [F2FS_FT_SOCK] = DT_SOCK,
48 [F2FS_FT_SYMLINK] = DT_LNK,
49 };
50
51 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 static 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 f2fs_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 /* If @dir is casefolded, initialize @fname->cf_name from @fname->usr_fname. */
74 int f2fs_init_casefolded_name(const struct inode *dir,
75 struct f2fs_filename *fname)
76 {
77 #ifdef CONFIG_UNICODE
78 struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
79
80 if (IS_CASEFOLDED(dir)) {
81 fname->cf_name.name = f2fs_kmalloc(sbi, F2FS_NAME_LEN,
82 GFP_NOFS);
83 if (!fname->cf_name.name)
84 return -ENOMEM;
85 fname->cf_name.len = utf8_casefold(sbi->s_encoding,
86 fname->usr_fname,
87 fname->cf_name.name,
88 F2FS_NAME_LEN);
89 if ((int)fname->cf_name.len <= 0) {
90 kfree(fname->cf_name.name);
91 fname->cf_name.name = NULL;
92 if (f2fs_has_strict_mode(sbi))
93 return -EINVAL;
94 /* fall back to treating name as opaque byte sequence */
95 }
96 }
97 #endif
98 return 0;
99 }
100
101 static int __f2fs_setup_filename(const struct inode *dir,
102 const struct fscrypt_name *crypt_name,
103 struct f2fs_filename *fname)
104 {
105 int err;
106
107 memset(fname, 0, sizeof(*fname));
108
109 fname->usr_fname = crypt_name->usr_fname;
110 fname->disk_name = crypt_name->disk_name;
111 #ifdef CONFIG_FS_ENCRYPTION
112 fname->crypto_buf = crypt_name->crypto_buf;
113 #endif
114 if (crypt_name->is_ciphertext_name) {
115 /* hash was decoded from the no-key name */
116 fname->hash = cpu_to_le32(crypt_name->hash);
117 } else {
118 err = f2fs_init_casefolded_name(dir, fname);
119 if (err) {
120 f2fs_free_filename(fname);
121 return err;
122 }
123 f2fs_hash_filename(dir, fname);
124 }
125 return 0;
126 }
127
128 /*
129 * Prepare to search for @iname in @dir. This is similar to
130 * fscrypt_setup_filename(), but this also handles computing the casefolded name
131 * and the f2fs dirhash if needed, then packing all the information about this
132 * filename up into a 'struct f2fs_filename'.
133 */
134 int f2fs_setup_filename(struct inode *dir, const struct qstr *iname,
135 int lookup, struct f2fs_filename *fname)
136 {
137 struct fscrypt_name crypt_name;
138 int err;
139
140 err = fscrypt_setup_filename(dir, iname, lookup, &crypt_name);
141 if (err)
142 return err;
143
144 return __f2fs_setup_filename(dir, &crypt_name, fname);
145 }
146
147 /*
148 * Prepare to look up @dentry in @dir. This is similar to
149 * fscrypt_prepare_lookup(), but this also handles computing the casefolded name
150 * and the f2fs dirhash if needed, then packing all the information about this
151 * filename up into a 'struct f2fs_filename'.
152 */
153 int f2fs_prepare_lookup(struct inode *dir, struct dentry *dentry,
154 struct f2fs_filename *fname)
155 {
156 struct fscrypt_name crypt_name;
157 int err;
158
159 err = fscrypt_prepare_lookup(dir, dentry, &crypt_name);
160 if (err)
161 return err;
162
163 return __f2fs_setup_filename(dir, &crypt_name, fname);
164 }
165
166 void f2fs_free_filename(struct f2fs_filename *fname)
167 {
168 #ifdef CONFIG_FS_ENCRYPTION
169 kfree(fname->crypto_buf.name);
170 fname->crypto_buf.name = NULL;
171 #endif
172 #ifdef CONFIG_UNICODE
173 kfree(fname->cf_name.name);
174 fname->cf_name.name = NULL;
175 #endif
176 }
177
178 static unsigned long dir_block_index(unsigned int level,
179 int dir_level, unsigned int idx)
180 {
181 unsigned long i;
182 unsigned long bidx = 0;
183
184 for (i = 0; i < level; i++)
185 bidx += dir_buckets(i, dir_level) * bucket_blocks(i);
186 bidx += idx * bucket_blocks(level);
187 return bidx;
188 }
189
190 static struct f2fs_dir_entry *find_in_block(struct inode *dir,
191 struct page *dentry_page,
192 const struct f2fs_filename *fname,
193 int *max_slots,
194 struct page **res_page)
195 {
196 struct f2fs_dentry_block *dentry_blk;
197 struct f2fs_dir_entry *de;
198 struct f2fs_dentry_ptr d;
199
200 dentry_blk = (struct f2fs_dentry_block *)page_address(dentry_page);
201
202 make_dentry_ptr_block(dir, &d, dentry_blk);
203 de = f2fs_find_target_dentry(&d, fname, max_slots);
204 if (de)
205 *res_page = dentry_page;
206
207 return de;
208 }
209
210 #ifdef CONFIG_UNICODE
211 /*
212 * Test whether a case-insensitive directory entry matches the filename
213 * being searched for.
214 */
215 static bool f2fs_match_ci_name(const struct inode *dir, const struct qstr *name,
216 const u8 *de_name, u32 de_name_len)
217 {
218 const struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
219 const struct unicode_map *um = sbi->s_encoding;
220 struct qstr entry = QSTR_INIT(de_name, de_name_len);
221 int res;
222
223 res = utf8_strncasecmp_folded(um, name, &entry);
224 if (res < 0) {
225 /*
226 * In strict mode, ignore invalid names. In non-strict mode,
227 * fall back to treating them as opaque byte sequences.
228 */
229 if (f2fs_has_strict_mode(sbi) || name->len != entry.len)
230 return false;
231 return !memcmp(name->name, entry.name, name->len);
232 }
233 return res == 0;
234 }
235 #endif /* CONFIG_UNICODE */
236
237 static inline bool f2fs_match_name(const struct inode *dir,
238 const struct f2fs_filename *fname,
239 const u8 *de_name, u32 de_name_len)
240 {
241 struct fscrypt_name f;
242
243 #ifdef CONFIG_UNICODE
244 if (fname->cf_name.name) {
245 struct qstr cf = FSTR_TO_QSTR(&fname->cf_name);
246
247 return f2fs_match_ci_name(dir, &cf, de_name, de_name_len);
248 }
249 #endif
250 f.usr_fname = fname->usr_fname;
251 f.disk_name = fname->disk_name;
252 #ifdef CONFIG_FS_ENCRYPTION
253 f.crypto_buf = fname->crypto_buf;
254 #endif
255 return fscrypt_match_name(&f, de_name, de_name_len);
256 }
257
258 struct f2fs_dir_entry *f2fs_find_target_dentry(const struct f2fs_dentry_ptr *d,
259 const struct f2fs_filename *fname, int *max_slots)
260 {
261 struct f2fs_dir_entry *de;
262 unsigned long bit_pos = 0;
263 int max_len = 0;
264
265 if (max_slots)
266 *max_slots = 0;
267 while (bit_pos < d->max) {
268 if (!test_bit_le(bit_pos, d->bitmap)) {
269 bit_pos++;
270 max_len++;
271 continue;
272 }
273
274 de = &d->dentry[bit_pos];
275
276 if (unlikely(!de->name_len)) {
277 bit_pos++;
278 continue;
279 }
280
281 if (de->hash_code == fname->hash &&
282 f2fs_match_name(d->inode, fname, d->filename[bit_pos],
283 le16_to_cpu(de->name_len)))
284 goto found;
285
286 if (max_slots && max_len > *max_slots)
287 *max_slots = max_len;
288 max_len = 0;
289
290 bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
291 }
292
293 de = NULL;
294 found:
295 if (max_slots && max_len > *max_slots)
296 *max_slots = max_len;
297 return de;
298 }
299
300 static struct f2fs_dir_entry *find_in_level(struct inode *dir,
301 unsigned int level,
302 const struct f2fs_filename *fname,
303 struct page **res_page)
304 {
305 int s = GET_DENTRY_SLOTS(fname->disk_name.len);
306 unsigned int nbucket, nblock;
307 unsigned int bidx, end_block;
308 struct page *dentry_page;
309 struct f2fs_dir_entry *de = NULL;
310 bool room = false;
311 int max_slots;
312
313 nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level);
314 nblock = bucket_blocks(level);
315
316 bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level,
317 le32_to_cpu(fname->hash) % nbucket);
318 end_block = bidx + nblock;
319
320 for (; bidx < end_block; bidx++) {
321 /* no need to allocate new dentry pages to all the indices */
322 dentry_page = f2fs_find_data_page(dir, bidx);
323 if (IS_ERR(dentry_page)) {
324 if (PTR_ERR(dentry_page) == -ENOENT) {
325 room = true;
326 continue;
327 } else {
328 *res_page = dentry_page;
329 break;
330 }
331 }
332
333 de = find_in_block(dir, dentry_page, fname, &max_slots,
334 res_page);
335 if (de)
336 break;
337
338 if (max_slots >= s)
339 room = true;
340 f2fs_put_page(dentry_page, 0);
341 }
342
343 if (!de && room && F2FS_I(dir)->chash != fname->hash) {
344 F2FS_I(dir)->chash = fname->hash;
345 F2FS_I(dir)->clevel = level;
346 }
347
348 return de;
349 }
350
351 struct f2fs_dir_entry *__f2fs_find_entry(struct inode *dir,
352 const struct f2fs_filename *fname,
353 struct page **res_page)
354 {
355 unsigned long npages = dir_blocks(dir);
356 struct f2fs_dir_entry *de = NULL;
357 unsigned int max_depth;
358 unsigned int level;
359
360 if (f2fs_has_inline_dentry(dir)) {
361 *res_page = NULL;
362 de = f2fs_find_in_inline_dir(dir, fname, res_page);
363 goto out;
364 }
365
366 if (npages == 0) {
367 *res_page = NULL;
368 goto out;
369 }
370
371 max_depth = F2FS_I(dir)->i_current_depth;
372 if (unlikely(max_depth > MAX_DIR_HASH_DEPTH)) {
373 f2fs_warn(F2FS_I_SB(dir), "Corrupted max_depth of %lu: %u",
374 dir->i_ino, max_depth);
375 max_depth = MAX_DIR_HASH_DEPTH;
376 f2fs_i_depth_write(dir, max_depth);
377 }
378
379 for (level = 0; level < max_depth; level++) {
380 *res_page = NULL;
381 de = find_in_level(dir, level, fname, res_page);
382 if (de || IS_ERR(*res_page))
383 break;
384 }
385 out:
386 /* This is to increase the speed of f2fs_create */
387 if (!de)
388 F2FS_I(dir)->task = current;
389 return de;
390 }
391
392 /*
393 * Find an entry in the specified directory with the wanted name.
394 * It returns the page where the entry was found (as a parameter - res_page),
395 * and the entry itself. Page is returned mapped and unlocked.
396 * Entry is guaranteed to be valid.
397 */
398 struct f2fs_dir_entry *f2fs_find_entry(struct inode *dir,
399 const struct qstr *child, struct page **res_page)
400 {
401 struct f2fs_dir_entry *de = NULL;
402 struct f2fs_filename fname;
403 int err;
404
405 err = f2fs_setup_filename(dir, child, 1, &fname);
406 if (err) {
407 if (err == -ENOENT)
408 *res_page = NULL;
409 else
410 *res_page = ERR_PTR(err);
411 return NULL;
412 }
413
414 de = __f2fs_find_entry(dir, &fname, res_page);
415
416 f2fs_free_filename(&fname);
417 return de;
418 }
419
420 struct f2fs_dir_entry *f2fs_parent_dir(struct inode *dir, struct page **p)
421 {
422 struct qstr dotdot = QSTR_INIT("..", 2);
423
424 return f2fs_find_entry(dir, &dotdot, p);
425 }
426
427 ino_t f2fs_inode_by_name(struct inode *dir, const struct qstr *qstr,
428 struct page **page)
429 {
430 ino_t res = 0;
431 struct f2fs_dir_entry *de;
432
433 de = f2fs_find_entry(dir, qstr, page);
434 if (de) {
435 res = le32_to_cpu(de->ino);
436 f2fs_put_page(*page, 0);
437 }
438
439 return res;
440 }
441
442 void f2fs_set_link(struct inode *dir, struct f2fs_dir_entry *de,
443 struct page *page, struct inode *inode)
444 {
445 enum page_type type = f2fs_has_inline_dentry(dir) ? NODE : DATA;
446 lock_page(page);
447 f2fs_wait_on_page_writeback(page, type, true, true);
448 de->ino = cpu_to_le32(inode->i_ino);
449 set_de_type(de, inode->i_mode);
450 set_page_dirty(page);
451
452 dir->i_mtime = dir->i_ctime = current_time(dir);
453 f2fs_mark_inode_dirty_sync(dir, false);
454 f2fs_put_page(page, 1);
455 }
456
457 static void init_dent_inode(const struct f2fs_filename *fname,
458 struct page *ipage)
459 {
460 struct f2fs_inode *ri;
461
462 f2fs_wait_on_page_writeback(ipage, NODE, true, true);
463
464 /* copy name info. to this inode page */
465 ri = F2FS_INODE(ipage);
466 ri->i_namelen = cpu_to_le32(fname->disk_name.len);
467 memcpy(ri->i_name, fname->disk_name.name, fname->disk_name.len);
468 set_page_dirty(ipage);
469 }
470
471 void f2fs_do_make_empty_dir(struct inode *inode, struct inode *parent,
472 struct f2fs_dentry_ptr *d)
473 {
474 struct fscrypt_str dot = FSTR_INIT(".", 1);
475 struct fscrypt_str dotdot = FSTR_INIT("..", 2);
476
477 /* update dirent of "." */
478 f2fs_update_dentry(inode->i_ino, inode->i_mode, d, &dot, 0, 0);
479
480 /* update dirent of ".." */
481 f2fs_update_dentry(parent->i_ino, parent->i_mode, d, &dotdot, 0, 1);
482 }
483
484 static int make_empty_dir(struct inode *inode,
485 struct inode *parent, struct page *page)
486 {
487 struct page *dentry_page;
488 struct f2fs_dentry_block *dentry_blk;
489 struct f2fs_dentry_ptr d;
490
491 if (f2fs_has_inline_dentry(inode))
492 return f2fs_make_empty_inline_dir(inode, parent, page);
493
494 dentry_page = f2fs_get_new_data_page(inode, page, 0, true);
495 if (IS_ERR(dentry_page))
496 return PTR_ERR(dentry_page);
497
498 dentry_blk = page_address(dentry_page);
499
500 make_dentry_ptr_block(NULL, &d, dentry_blk);
501 f2fs_do_make_empty_dir(inode, parent, &d);
502
503 set_page_dirty(dentry_page);
504 f2fs_put_page(dentry_page, 1);
505 return 0;
506 }
507
508 struct page *f2fs_init_inode_metadata(struct inode *inode, struct inode *dir,
509 const struct f2fs_filename *fname, struct page *dpage)
510 {
511 struct page *page;
512 int err;
513
514 if (is_inode_flag_set(inode, FI_NEW_INODE)) {
515 page = f2fs_new_inode_page(inode);
516 if (IS_ERR(page))
517 return page;
518
519 if (S_ISDIR(inode->i_mode)) {
520 /* in order to handle error case */
521 get_page(page);
522 err = make_empty_dir(inode, dir, page);
523 if (err) {
524 lock_page(page);
525 goto put_error;
526 }
527 put_page(page);
528 }
529
530 err = f2fs_init_acl(inode, dir, page, dpage);
531 if (err)
532 goto put_error;
533
534 err = f2fs_init_security(inode, dir,
535 fname ? fname->usr_fname : NULL, page);
536 if (err)
537 goto put_error;
538
539 if (IS_ENCRYPTED(inode)) {
540 err = fscrypt_inherit_context(dir, inode, page, false);
541 if (err)
542 goto put_error;
543 }
544 } else {
545 page = f2fs_get_node_page(F2FS_I_SB(dir), inode->i_ino);
546 if (IS_ERR(page))
547 return page;
548 }
549
550 if (fname) {
551 init_dent_inode(fname, page);
552 if (IS_ENCRYPTED(dir))
553 file_set_enc_name(inode);
554 }
555
556 /*
557 * This file should be checkpointed during fsync.
558 * We lost i_pino from now on.
559 */
560 if (is_inode_flag_set(inode, FI_INC_LINK)) {
561 if (!S_ISDIR(inode->i_mode))
562 file_lost_pino(inode);
563 /*
564 * If link the tmpfile to alias through linkat path,
565 * we should remove this inode from orphan list.
566 */
567 if (inode->i_nlink == 0)
568 f2fs_remove_orphan_inode(F2FS_I_SB(dir), inode->i_ino);
569 f2fs_i_links_write(inode, true);
570 }
571 return page;
572
573 put_error:
574 clear_nlink(inode);
575 f2fs_update_inode(inode, page);
576 f2fs_put_page(page, 1);
577 return ERR_PTR(err);
578 }
579
580 void f2fs_update_parent_metadata(struct inode *dir, struct inode *inode,
581 unsigned int current_depth)
582 {
583 if (inode && is_inode_flag_set(inode, FI_NEW_INODE)) {
584 if (S_ISDIR(inode->i_mode))
585 f2fs_i_links_write(dir, true);
586 clear_inode_flag(inode, FI_NEW_INODE);
587 }
588 dir->i_mtime = dir->i_ctime = current_time(dir);
589 f2fs_mark_inode_dirty_sync(dir, false);
590
591 if (F2FS_I(dir)->i_current_depth != current_depth)
592 f2fs_i_depth_write(dir, current_depth);
593
594 if (inode && is_inode_flag_set(inode, FI_INC_LINK))
595 clear_inode_flag(inode, FI_INC_LINK);
596 }
597
598 int f2fs_room_for_filename(const void *bitmap, int slots, int max_slots)
599 {
600 int bit_start = 0;
601 int zero_start, zero_end;
602 next:
603 zero_start = find_next_zero_bit_le(bitmap, max_slots, bit_start);
604 if (zero_start >= max_slots)
605 return max_slots;
606
607 zero_end = find_next_bit_le(bitmap, max_slots, zero_start);
608 if (zero_end - zero_start >= slots)
609 return zero_start;
610
611 bit_start = zero_end + 1;
612
613 if (zero_end + 1 >= max_slots)
614 return max_slots;
615 goto next;
616 }
617
618 bool f2fs_has_enough_room(struct inode *dir, struct page *ipage,
619 const struct f2fs_filename *fname)
620 {
621 struct f2fs_dentry_ptr d;
622 unsigned int bit_pos;
623 int slots = GET_DENTRY_SLOTS(fname->disk_name.len);
624
625 make_dentry_ptr_inline(dir, &d, inline_data_addr(dir, ipage));
626
627 bit_pos = f2fs_room_for_filename(d.bitmap, slots, d.max);
628
629 return bit_pos < d.max;
630 }
631
632 void f2fs_update_dentry(nid_t ino, umode_t mode, struct f2fs_dentry_ptr *d,
633 const struct fscrypt_str *name, f2fs_hash_t name_hash,
634 unsigned int bit_pos)
635 {
636 struct f2fs_dir_entry *de;
637 int slots = GET_DENTRY_SLOTS(name->len);
638 int i;
639
640 de = &d->dentry[bit_pos];
641 de->hash_code = name_hash;
642 de->name_len = cpu_to_le16(name->len);
643 memcpy(d->filename[bit_pos], name->name, name->len);
644 de->ino = cpu_to_le32(ino);
645 set_de_type(de, mode);
646 for (i = 0; i < slots; i++) {
647 __set_bit_le(bit_pos + i, (void *)d->bitmap);
648 /* avoid wrong garbage data for readdir */
649 if (i)
650 (de + i)->name_len = 0;
651 }
652 }
653
654 int f2fs_add_regular_entry(struct inode *dir, const struct f2fs_filename *fname,
655 struct inode *inode, nid_t ino, umode_t mode)
656 {
657 unsigned int bit_pos;
658 unsigned int level;
659 unsigned int current_depth;
660 unsigned long bidx, block;
661 unsigned int nbucket, nblock;
662 struct page *dentry_page = NULL;
663 struct f2fs_dentry_block *dentry_blk = NULL;
664 struct f2fs_dentry_ptr d;
665 struct page *page = NULL;
666 int slots, err = 0;
667
668 level = 0;
669 slots = GET_DENTRY_SLOTS(fname->disk_name.len);
670
671 current_depth = F2FS_I(dir)->i_current_depth;
672 if (F2FS_I(dir)->chash == fname->hash) {
673 level = F2FS_I(dir)->clevel;
674 F2FS_I(dir)->chash = 0;
675 }
676
677 start:
678 if (time_to_inject(F2FS_I_SB(dir), FAULT_DIR_DEPTH)) {
679 f2fs_show_injection_info(F2FS_I_SB(dir), FAULT_DIR_DEPTH);
680 return -ENOSPC;
681 }
682
683 if (unlikely(current_depth == MAX_DIR_HASH_DEPTH))
684 return -ENOSPC;
685
686 /* Increase the depth, if required */
687 if (level == current_depth)
688 ++current_depth;
689
690 nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level);
691 nblock = bucket_blocks(level);
692
693 bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level,
694 (le32_to_cpu(fname->hash) % nbucket));
695
696 for (block = bidx; block <= (bidx + nblock - 1); block++) {
697 dentry_page = f2fs_get_new_data_page(dir, NULL, block, true);
698 if (IS_ERR(dentry_page))
699 return PTR_ERR(dentry_page);
700
701 dentry_blk = page_address(dentry_page);
702 bit_pos = f2fs_room_for_filename(&dentry_blk->dentry_bitmap,
703 slots, NR_DENTRY_IN_BLOCK);
704 if (bit_pos < NR_DENTRY_IN_BLOCK)
705 goto add_dentry;
706
707 f2fs_put_page(dentry_page, 1);
708 }
709
710 /* Move to next level to find the empty slot for new dentry */
711 ++level;
712 goto start;
713 add_dentry:
714 f2fs_wait_on_page_writeback(dentry_page, DATA, true, true);
715
716 if (inode) {
717 down_write(&F2FS_I(inode)->i_sem);
718 page = f2fs_init_inode_metadata(inode, dir, fname, NULL);
719 if (IS_ERR(page)) {
720 err = PTR_ERR(page);
721 goto fail;
722 }
723 }
724
725 make_dentry_ptr_block(NULL, &d, dentry_blk);
726 f2fs_update_dentry(ino, mode, &d, &fname->disk_name, fname->hash,
727 bit_pos);
728
729 set_page_dirty(dentry_page);
730
731 if (inode) {
732 f2fs_i_pino_write(inode, dir->i_ino);
733
734 /* synchronize inode page's data from inode cache */
735 if (is_inode_flag_set(inode, FI_NEW_INODE))
736 f2fs_update_inode(inode, page);
737
738 f2fs_put_page(page, 1);
739 }
740
741 f2fs_update_parent_metadata(dir, inode, current_depth);
742 fail:
743 if (inode)
744 up_write(&F2FS_I(inode)->i_sem);
745
746 f2fs_put_page(dentry_page, 1);
747
748 return err;
749 }
750
751 int f2fs_add_dentry(struct inode *dir, const struct f2fs_filename *fname,
752 struct inode *inode, nid_t ino, umode_t mode)
753 {
754 int err = -EAGAIN;
755
756 if (f2fs_has_inline_dentry(dir))
757 err = f2fs_add_inline_entry(dir, fname, inode, ino, mode);
758 if (err == -EAGAIN)
759 err = f2fs_add_regular_entry(dir, fname, inode, ino, mode);
760
761 f2fs_update_time(F2FS_I_SB(dir), REQ_TIME);
762 return err;
763 }
764
765 /*
766 * Caller should grab and release a rwsem by calling f2fs_lock_op() and
767 * f2fs_unlock_op().
768 */
769 int f2fs_do_add_link(struct inode *dir, const struct qstr *name,
770 struct inode *inode, nid_t ino, umode_t mode)
771 {
772 struct f2fs_filename fname;
773 struct page *page = NULL;
774 struct f2fs_dir_entry *de = NULL;
775 int err;
776
777 err = f2fs_setup_filename(dir, name, 0, &fname);
778 if (err)
779 return err;
780
781 /*
782 * An immature stackable filesystem shows a race condition between lookup
783 * and create. If we have same task when doing lookup and create, it's
784 * definitely fine as expected by VFS normally. Otherwise, let's just
785 * verify on-disk dentry one more time, which guarantees filesystem
786 * consistency more.
787 */
788 if (current != F2FS_I(dir)->task) {
789 de = __f2fs_find_entry(dir, &fname, &page);
790 F2FS_I(dir)->task = NULL;
791 }
792 if (de) {
793 f2fs_put_page(page, 0);
794 err = -EEXIST;
795 } else if (IS_ERR(page)) {
796 err = PTR_ERR(page);
797 } else {
798 err = f2fs_add_dentry(dir, &fname, inode, ino, mode);
799 }
800 f2fs_free_filename(&fname);
801 return err;
802 }
803
804 int f2fs_do_tmpfile(struct inode *inode, struct inode *dir)
805 {
806 struct page *page;
807 int err = 0;
808
809 down_write(&F2FS_I(inode)->i_sem);
810 page = f2fs_init_inode_metadata(inode, dir, NULL, NULL);
811 if (IS_ERR(page)) {
812 err = PTR_ERR(page);
813 goto fail;
814 }
815 f2fs_put_page(page, 1);
816
817 clear_inode_flag(inode, FI_NEW_INODE);
818 f2fs_update_time(F2FS_I_SB(inode), REQ_TIME);
819 fail:
820 up_write(&F2FS_I(inode)->i_sem);
821 return err;
822 }
823
824 void f2fs_drop_nlink(struct inode *dir, struct inode *inode)
825 {
826 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
827
828 down_write(&F2FS_I(inode)->i_sem);
829
830 if (S_ISDIR(inode->i_mode))
831 f2fs_i_links_write(dir, false);
832 inode->i_ctime = current_time(inode);
833
834 f2fs_i_links_write(inode, false);
835 if (S_ISDIR(inode->i_mode)) {
836 f2fs_i_links_write(inode, false);
837 f2fs_i_size_write(inode, 0);
838 }
839 up_write(&F2FS_I(inode)->i_sem);
840
841 if (inode->i_nlink == 0)
842 f2fs_add_orphan_inode(inode);
843 else
844 f2fs_release_orphan_inode(sbi);
845 }
846
847 /*
848 * It only removes the dentry from the dentry page, corresponding name
849 * entry in name page does not need to be touched during deletion.
850 */
851 void f2fs_delete_entry(struct f2fs_dir_entry *dentry, struct page *page,
852 struct inode *dir, struct inode *inode)
853 {
854 struct f2fs_dentry_block *dentry_blk;
855 unsigned int bit_pos;
856 int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len));
857 int i;
858
859 f2fs_update_time(F2FS_I_SB(dir), REQ_TIME);
860
861 if (F2FS_OPTION(F2FS_I_SB(dir)).fsync_mode == FSYNC_MODE_STRICT)
862 f2fs_add_ino_entry(F2FS_I_SB(dir), dir->i_ino, TRANS_DIR_INO);
863
864 if (f2fs_has_inline_dentry(dir))
865 return f2fs_delete_inline_entry(dentry, page, dir, inode);
866
867 lock_page(page);
868 f2fs_wait_on_page_writeback(page, DATA, true, true);
869
870 dentry_blk = page_address(page);
871 bit_pos = dentry - dentry_blk->dentry;
872 for (i = 0; i < slots; i++)
873 __clear_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap);
874
875 /* Let's check and deallocate this dentry page */
876 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
877 NR_DENTRY_IN_BLOCK,
878 0);
879 set_page_dirty(page);
880
881 if (bit_pos == NR_DENTRY_IN_BLOCK &&
882 !f2fs_truncate_hole(dir, page->index, page->index + 1)) {
883 f2fs_clear_page_cache_dirty_tag(page);
884 clear_page_dirty_for_io(page);
885 f2fs_clear_page_private(page);
886 ClearPageUptodate(page);
887 clear_cold_data(page);
888 inode_dec_dirty_pages(dir);
889 f2fs_remove_dirty_inode(dir);
890 }
891 f2fs_put_page(page, 1);
892
893 dir->i_ctime = dir->i_mtime = current_time(dir);
894 f2fs_mark_inode_dirty_sync(dir, false);
895
896 if (inode)
897 f2fs_drop_nlink(dir, inode);
898 }
899
900 bool f2fs_empty_dir(struct inode *dir)
901 {
902 unsigned long bidx;
903 struct page *dentry_page;
904 unsigned int bit_pos;
905 struct f2fs_dentry_block *dentry_blk;
906 unsigned long nblock = dir_blocks(dir);
907
908 if (f2fs_has_inline_dentry(dir))
909 return f2fs_empty_inline_dir(dir);
910
911 for (bidx = 0; bidx < nblock; bidx++) {
912 dentry_page = f2fs_get_lock_data_page(dir, bidx, false);
913 if (IS_ERR(dentry_page)) {
914 if (PTR_ERR(dentry_page) == -ENOENT)
915 continue;
916 else
917 return false;
918 }
919
920 dentry_blk = page_address(dentry_page);
921 if (bidx == 0)
922 bit_pos = 2;
923 else
924 bit_pos = 0;
925 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
926 NR_DENTRY_IN_BLOCK,
927 bit_pos);
928
929 f2fs_put_page(dentry_page, 1);
930
931 if (bit_pos < NR_DENTRY_IN_BLOCK)
932 return false;
933 }
934 return true;
935 }
936
937 int f2fs_fill_dentries(struct dir_context *ctx, struct f2fs_dentry_ptr *d,
938 unsigned int start_pos, struct fscrypt_str *fstr)
939 {
940 unsigned char d_type = DT_UNKNOWN;
941 unsigned int bit_pos;
942 struct f2fs_dir_entry *de = NULL;
943 struct fscrypt_str de_name = FSTR_INIT(NULL, 0);
944 struct f2fs_sb_info *sbi = F2FS_I_SB(d->inode);
945 struct blk_plug plug;
946 bool readdir_ra = sbi->readdir_ra == 1;
947 int err = 0;
948
949 bit_pos = ((unsigned long)ctx->pos % d->max);
950
951 if (readdir_ra)
952 blk_start_plug(&plug);
953
954 while (bit_pos < d->max) {
955 bit_pos = find_next_bit_le(d->bitmap, d->max, bit_pos);
956 if (bit_pos >= d->max)
957 break;
958
959 de = &d->dentry[bit_pos];
960 if (de->name_len == 0) {
961 bit_pos++;
962 ctx->pos = start_pos + bit_pos;
963 printk_ratelimited(
964 "%sF2FS-fs (%s): invalid namelen(0), ino:%u, run fsck to fix.",
965 KERN_WARNING, sbi->sb->s_id,
966 le32_to_cpu(de->ino));
967 set_sbi_flag(sbi, SBI_NEED_FSCK);
968 continue;
969 }
970
971 d_type = f2fs_get_de_type(de);
972
973 de_name.name = d->filename[bit_pos];
974 de_name.len = le16_to_cpu(de->name_len);
975
976 /* check memory boundary before moving forward */
977 bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
978 if (unlikely(bit_pos > d->max ||
979 le16_to_cpu(de->name_len) > F2FS_NAME_LEN)) {
980 f2fs_warn(sbi, "%s: corrupted namelen=%d, run fsck to fix.",
981 __func__, le16_to_cpu(de->name_len));
982 set_sbi_flag(sbi, SBI_NEED_FSCK);
983 err = -EFSCORRUPTED;
984 goto out;
985 }
986
987 if (IS_ENCRYPTED(d->inode)) {
988 int save_len = fstr->len;
989
990 err = fscrypt_fname_disk_to_usr(d->inode,
991 (u32)le32_to_cpu(de->hash_code),
992 0, &de_name, fstr);
993 if (err)
994 goto out;
995
996 de_name = *fstr;
997 fstr->len = save_len;
998 }
999
1000 if (!dir_emit(ctx, de_name.name, de_name.len,
1001 le32_to_cpu(de->ino), d_type)) {
1002 err = 1;
1003 goto out;
1004 }
1005
1006 if (readdir_ra)
1007 f2fs_ra_node_page(sbi, le32_to_cpu(de->ino));
1008
1009 ctx->pos = start_pos + bit_pos;
1010 }
1011 out:
1012 if (readdir_ra)
1013 blk_finish_plug(&plug);
1014 return err;
1015 }
1016
1017 static int f2fs_readdir(struct file *file, struct dir_context *ctx)
1018 {
1019 struct inode *inode = file_inode(file);
1020 unsigned long npages = dir_blocks(inode);
1021 struct f2fs_dentry_block *dentry_blk = NULL;
1022 struct page *dentry_page = NULL;
1023 struct file_ra_state *ra = &file->f_ra;
1024 loff_t start_pos = ctx->pos;
1025 unsigned int n = ((unsigned long)ctx->pos / NR_DENTRY_IN_BLOCK);
1026 struct f2fs_dentry_ptr d;
1027 struct fscrypt_str fstr = FSTR_INIT(NULL, 0);
1028 int err = 0;
1029
1030 if (IS_ENCRYPTED(inode)) {
1031 err = fscrypt_get_encryption_info(inode);
1032 if (err)
1033 goto out;
1034
1035 err = fscrypt_fname_alloc_buffer(F2FS_NAME_LEN, &fstr);
1036 if (err < 0)
1037 goto out;
1038 }
1039
1040 if (f2fs_has_inline_dentry(inode)) {
1041 err = f2fs_read_inline_dir(file, ctx, &fstr);
1042 goto out_free;
1043 }
1044
1045 for (; n < npages; n++, ctx->pos = n * NR_DENTRY_IN_BLOCK) {
1046
1047 /* allow readdir() to be interrupted */
1048 if (fatal_signal_pending(current)) {
1049 err = -ERESTARTSYS;
1050 goto out_free;
1051 }
1052 cond_resched();
1053
1054 /* readahead for multi pages of dir */
1055 if (npages - n > 1 && !ra_has_index(ra, n))
1056 page_cache_sync_readahead(inode->i_mapping, ra, file, n,
1057 min(npages - n, (pgoff_t)MAX_DIR_RA_PAGES));
1058
1059 dentry_page = f2fs_find_data_page(inode, n);
1060 if (IS_ERR(dentry_page)) {
1061 err = PTR_ERR(dentry_page);
1062 if (err == -ENOENT) {
1063 err = 0;
1064 continue;
1065 } else {
1066 goto out_free;
1067 }
1068 }
1069
1070 dentry_blk = page_address(dentry_page);
1071
1072 make_dentry_ptr_block(inode, &d, dentry_blk);
1073
1074 err = f2fs_fill_dentries(ctx, &d,
1075 n * NR_DENTRY_IN_BLOCK, &fstr);
1076 if (err) {
1077 f2fs_put_page(dentry_page, 0);
1078 break;
1079 }
1080
1081 f2fs_put_page(dentry_page, 0);
1082 }
1083 out_free:
1084 fscrypt_fname_free_buffer(&fstr);
1085 out:
1086 trace_f2fs_readdir(inode, start_pos, ctx->pos, err);
1087 return err < 0 ? err : 0;
1088 }
1089
1090 static int f2fs_dir_open(struct inode *inode, struct file *filp)
1091 {
1092 if (IS_ENCRYPTED(inode))
1093 return fscrypt_get_encryption_info(inode) ? -EACCES : 0;
1094 return 0;
1095 }
1096
1097 const struct file_operations f2fs_dir_operations = {
1098 .llseek = generic_file_llseek,
1099 .read = generic_read_dir,
1100 .iterate_shared = f2fs_readdir,
1101 .fsync = f2fs_sync_file,
1102 .open = f2fs_dir_open,
1103 .unlocked_ioctl = f2fs_ioctl,
1104 #ifdef CONFIG_COMPAT
1105 .compat_ioctl = f2fs_compat_ioctl,
1106 #endif
1107 };
1108
1109 #ifdef CONFIG_UNICODE
1110 static int f2fs_d_compare(const struct dentry *dentry, unsigned int len,
1111 const char *str, const struct qstr *name)
1112 {
1113 const struct dentry *parent = READ_ONCE(dentry->d_parent);
1114 const struct inode *dir = READ_ONCE(parent->d_inode);
1115 const struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb);
1116 struct qstr entry = QSTR_INIT(str, len);
1117 char strbuf[DNAME_INLINE_LEN];
1118 int res;
1119
1120 if (!dir || !IS_CASEFOLDED(dir))
1121 goto fallback;
1122
1123 /*
1124 * If the dentry name is stored in-line, then it may be concurrently
1125 * modified by a rename. If this happens, the VFS will eventually retry
1126 * the lookup, so it doesn't matter what ->d_compare() returns.
1127 * However, it's unsafe to call utf8_strncasecmp() with an unstable
1128 * string. Therefore, we have to copy the name into a temporary buffer.
1129 */
1130 if (len <= DNAME_INLINE_LEN - 1) {
1131 memcpy(strbuf, str, len);
1132 strbuf[len] = 0;
1133 entry.name = strbuf;
1134 /* prevent compiler from optimizing out the temporary buffer */
1135 barrier();
1136 }
1137
1138 res = utf8_strncasecmp(sbi->s_encoding, name, &entry);
1139 if (res >= 0)
1140 return res;
1141
1142 if (f2fs_has_strict_mode(sbi))
1143 return -EINVAL;
1144 fallback:
1145 if (len != name->len)
1146 return 1;
1147 return !!memcmp(str, name->name, len);
1148 }
1149
1150 static int f2fs_d_hash(const struct dentry *dentry, struct qstr *str)
1151 {
1152 struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb);
1153 const struct unicode_map *um = sbi->s_encoding;
1154 const struct inode *inode = READ_ONCE(dentry->d_inode);
1155 unsigned char *norm;
1156 int len, ret = 0;
1157
1158 if (!inode || !IS_CASEFOLDED(inode))
1159 return 0;
1160
1161 norm = f2fs_kmalloc(sbi, PATH_MAX, GFP_ATOMIC);
1162 if (!norm)
1163 return -ENOMEM;
1164
1165 len = utf8_casefold(um, str, norm, PATH_MAX);
1166 if (len < 0) {
1167 if (f2fs_has_strict_mode(sbi))
1168 ret = -EINVAL;
1169 goto out;
1170 }
1171 str->hash = full_name_hash(dentry, norm, len);
1172 out:
1173 kvfree(norm);
1174 return ret;
1175 }
1176
1177 const struct dentry_operations f2fs_dentry_ops = {
1178 .d_hash = f2fs_d_hash,
1179 .d_compare = f2fs_d_compare,
1180 };
1181 #endif
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