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Merge tag 'regmap-fix-v5.11-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux/fpc-iii.git] / fs / f2fs / namei.c
blob6edb1ab579a18b2e3d270aadaced354b63d6648d
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * fs/f2fs/namei.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/pagemap.h>
11 #include <linux/sched.h>
12 #include <linux/ctype.h>
13 #include <linux/random.h>
14 #include <linux/dcache.h>
15 #include <linux/namei.h>
16 #include <linux/quotaops.h>
17
18 #include "f2fs.h"
19 #include "node.h"
20 #include "segment.h"
21 #include "xattr.h"
22 #include "acl.h"
23 #include <trace/events/f2fs.h>
24
25 static struct inode *f2fs_new_inode(struct inode *dir, umode_t mode)
26 {
27 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
28 nid_t ino;
29 struct inode *inode;
30 bool nid_free = false;
31 bool encrypt = false;
32 int xattr_size = 0;
33 int err;
34
35 inode = new_inode(dir->i_sb);
36 if (!inode)
37 return ERR_PTR(-ENOMEM);
38
39 f2fs_lock_op(sbi);
40 if (!f2fs_alloc_nid(sbi, &ino)) {
41 f2fs_unlock_op(sbi);
42 err = -ENOSPC;
43 goto fail;
44 }
45 f2fs_unlock_op(sbi);
46
47 nid_free = true;
48
49 inode_init_owner(inode, dir, mode);
50
51 inode->i_ino = ino;
52 inode->i_blocks = 0;
53 inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
54 F2FS_I(inode)->i_crtime = inode->i_mtime;
55 inode->i_generation = prandom_u32();
56
57 if (S_ISDIR(inode->i_mode))
58 F2FS_I(inode)->i_current_depth = 1;
59
60 err = insert_inode_locked(inode);
61 if (err) {
62 err = -EINVAL;
63 goto fail;
64 }
65
66 if (f2fs_sb_has_project_quota(sbi) &&
67 (F2FS_I(dir)->i_flags & F2FS_PROJINHERIT_FL))
68 F2FS_I(inode)->i_projid = F2FS_I(dir)->i_projid;
69 else
70 F2FS_I(inode)->i_projid = make_kprojid(&init_user_ns,
71 F2FS_DEF_PROJID);
72
73 err = fscrypt_prepare_new_inode(dir, inode, &encrypt);
74 if (err)
75 goto fail_drop;
76
77 err = dquot_initialize(inode);
78 if (err)
79 goto fail_drop;
80
81 set_inode_flag(inode, FI_NEW_INODE);
82
83 if (encrypt)
84 f2fs_set_encrypted_inode(inode);
85
86 if (f2fs_sb_has_extra_attr(sbi)) {
87 set_inode_flag(inode, FI_EXTRA_ATTR);
88 F2FS_I(inode)->i_extra_isize = F2FS_TOTAL_EXTRA_ATTR_SIZE;
89 }
90
91 if (test_opt(sbi, INLINE_XATTR))
92 set_inode_flag(inode, FI_INLINE_XATTR);
93
94 if (test_opt(sbi, INLINE_DATA) && f2fs_may_inline_data(inode))
95 set_inode_flag(inode, FI_INLINE_DATA);
96 if (f2fs_may_inline_dentry(inode))
97 set_inode_flag(inode, FI_INLINE_DENTRY);
98
99 if (f2fs_sb_has_flexible_inline_xattr(sbi)) {
100 f2fs_bug_on(sbi, !f2fs_has_extra_attr(inode));
101 if (f2fs_has_inline_xattr(inode))
102 xattr_size = F2FS_OPTION(sbi).inline_xattr_size;
103 /* Otherwise, will be 0 */
104 } else if (f2fs_has_inline_xattr(inode) ||
105 f2fs_has_inline_dentry(inode)) {
106 xattr_size = DEFAULT_INLINE_XATTR_ADDRS;
107 }
108 F2FS_I(inode)->i_inline_xattr_size = xattr_size;
109
110 f2fs_init_extent_tree(inode, NULL);
111
112 stat_inc_inline_xattr(inode);
113 stat_inc_inline_inode(inode);
114 stat_inc_inline_dir(inode);
115
116 F2FS_I(inode)->i_flags =
117 f2fs_mask_flags(mode, F2FS_I(dir)->i_flags & F2FS_FL_INHERITED);
118
119 if (S_ISDIR(inode->i_mode))
120 F2FS_I(inode)->i_flags |= F2FS_INDEX_FL;
121
122 if (F2FS_I(inode)->i_flags & F2FS_PROJINHERIT_FL)
123 set_inode_flag(inode, FI_PROJ_INHERIT);
124
125 if (f2fs_sb_has_compression(sbi)) {
126 /* Inherit the compression flag in directory */
127 if ((F2FS_I(dir)->i_flags & F2FS_COMPR_FL) &&
128 f2fs_may_compress(inode))
129 set_compress_context(inode);
130 }
131
132 f2fs_set_inode_flags(inode);
133
134 trace_f2fs_new_inode(inode, 0);
135 return inode;
136
137 fail:
138 trace_f2fs_new_inode(inode, err);
139 make_bad_inode(inode);
140 if (nid_free)
141 set_inode_flag(inode, FI_FREE_NID);
142 iput(inode);
143 return ERR_PTR(err);
144 fail_drop:
145 trace_f2fs_new_inode(inode, err);
146 dquot_drop(inode);
147 inode->i_flags |= S_NOQUOTA;
148 if (nid_free)
149 set_inode_flag(inode, FI_FREE_NID);
150 clear_nlink(inode);
151 unlock_new_inode(inode);
152 iput(inode);
153 return ERR_PTR(err);
154 }
155
156 static inline int is_extension_exist(const unsigned char *s, const char *sub)
157 {
158 size_t slen = strlen(s);
159 size_t sublen = strlen(sub);
160 int i;
161
162 if (sublen == 1 && *sub == '*')
163 return 1;
164
165 /*
166 * filename format of multimedia file should be defined as:
167 * "filename + '.' + extension + (optional: '.' + temp extension)".
168 */
169 if (slen < sublen + 2)
170 return 0;
171
172 for (i = 1; i < slen - sublen; i++) {
173 if (s[i] != '.')
174 continue;
175 if (!strncasecmp(s + i + 1, sub, sublen))
176 return 1;
177 }
178
179 return 0;
180 }
181
182 /*
183 * Set file's temperature for hot/cold data separation
184 */
185 static inline void set_file_temperature(struct f2fs_sb_info *sbi, struct inode *inode,
186 const unsigned char *name)
187 {
188 __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
189 int i, cold_count, hot_count;
190
191 down_read(&sbi->sb_lock);
192
193 cold_count = le32_to_cpu(sbi->raw_super->extension_count);
194 hot_count = sbi->raw_super->hot_ext_count;
195
196 for (i = 0; i < cold_count + hot_count; i++) {
197 if (is_extension_exist(name, extlist[i]))
198 break;
199 }
200
201 up_read(&sbi->sb_lock);
202
203 if (i == cold_count + hot_count)
204 return;
205
206 if (i < cold_count)
207 file_set_cold(inode);
208 else
209 file_set_hot(inode);
210 }
211
212 int f2fs_update_extension_list(struct f2fs_sb_info *sbi, const char *name,
213 bool hot, bool set)
214 {
215 __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
216 int cold_count = le32_to_cpu(sbi->raw_super->extension_count);
217 int hot_count = sbi->raw_super->hot_ext_count;
218 int total_count = cold_count + hot_count;
219 int start, count;
220 int i;
221
222 if (set) {
223 if (total_count == F2FS_MAX_EXTENSION)
224 return -EINVAL;
225 } else {
226 if (!hot && !cold_count)
227 return -EINVAL;
228 if (hot && !hot_count)
229 return -EINVAL;
230 }
231
232 if (hot) {
233 start = cold_count;
234 count = total_count;
235 } else {
236 start = 0;
237 count = cold_count;
238 }
239
240 for (i = start; i < count; i++) {
241 if (strcmp(name, extlist[i]))
242 continue;
243
244 if (set)
245 return -EINVAL;
246
247 memcpy(extlist[i], extlist[i + 1],
248 F2FS_EXTENSION_LEN * (total_count - i - 1));
249 memset(extlist[total_count - 1], 0, F2FS_EXTENSION_LEN);
250 if (hot)
251 sbi->raw_super->hot_ext_count = hot_count - 1;
252 else
253 sbi->raw_super->extension_count =
254 cpu_to_le32(cold_count - 1);
255 return 0;
256 }
257
258 if (!set)
259 return -EINVAL;
260
261 if (hot) {
262 memcpy(extlist[count], name, strlen(name));
263 sbi->raw_super->hot_ext_count = hot_count + 1;
264 } else {
265 char buf[F2FS_MAX_EXTENSION][F2FS_EXTENSION_LEN];
266
267 memcpy(buf, &extlist[cold_count],
268 F2FS_EXTENSION_LEN * hot_count);
269 memset(extlist[cold_count], 0, F2FS_EXTENSION_LEN);
270 memcpy(extlist[cold_count], name, strlen(name));
271 memcpy(&extlist[cold_count + 1], buf,
272 F2FS_EXTENSION_LEN * hot_count);
273 sbi->raw_super->extension_count = cpu_to_le32(cold_count + 1);
274 }
275 return 0;
276 }
277
278 static void set_compress_inode(struct f2fs_sb_info *sbi, struct inode *inode,
279 const unsigned char *name)
280 {
281 __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
282 unsigned char (*ext)[F2FS_EXTENSION_LEN];
283 unsigned int ext_cnt = F2FS_OPTION(sbi).compress_ext_cnt;
284 int i, cold_count, hot_count;
285
286 if (!f2fs_sb_has_compression(sbi) ||
287 is_inode_flag_set(inode, FI_COMPRESSED_FILE) ||
288 F2FS_I(inode)->i_flags & F2FS_NOCOMP_FL ||
289 !f2fs_may_compress(inode))
290 return;
291
292 down_read(&sbi->sb_lock);
293
294 cold_count = le32_to_cpu(sbi->raw_super->extension_count);
295 hot_count = sbi->raw_super->hot_ext_count;
296
297 for (i = cold_count; i < cold_count + hot_count; i++) {
298 if (is_extension_exist(name, extlist[i])) {
299 up_read(&sbi->sb_lock);
300 return;
301 }
302 }
303
304 up_read(&sbi->sb_lock);
305
306 ext = F2FS_OPTION(sbi).extensions;
307
308 for (i = 0; i < ext_cnt; i++) {
309 if (!is_extension_exist(name, ext[i]))
310 continue;
311
312 set_compress_context(inode);
313 return;
314 }
315 }
316
317 static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
318 bool excl)
319 {
320 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
321 struct inode *inode;
322 nid_t ino = 0;
323 int err;
324
325 if (unlikely(f2fs_cp_error(sbi)))
326 return -EIO;
327 if (!f2fs_is_checkpoint_ready(sbi))
328 return -ENOSPC;
329
330 err = dquot_initialize(dir);
331 if (err)
332 return err;
333
334 inode = f2fs_new_inode(dir, mode);
335 if (IS_ERR(inode))
336 return PTR_ERR(inode);
337
338 if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
339 set_file_temperature(sbi, inode, dentry->d_name.name);
340
341 set_compress_inode(sbi, inode, dentry->d_name.name);
342
343 inode->i_op = &f2fs_file_inode_operations;
344 inode->i_fop = &f2fs_file_operations;
345 inode->i_mapping->a_ops = &f2fs_dblock_aops;
346 ino = inode->i_ino;
347
348 f2fs_lock_op(sbi);
349 err = f2fs_add_link(dentry, inode);
350 if (err)
351 goto out;
352 f2fs_unlock_op(sbi);
353
354 f2fs_alloc_nid_done(sbi, ino);
355
356 d_instantiate_new(dentry, inode);
357
358 if (IS_DIRSYNC(dir))
359 f2fs_sync_fs(sbi->sb, 1);
360
361 f2fs_balance_fs(sbi, true);
362 return 0;
363 out:
364 f2fs_handle_failed_inode(inode);
365 return err;
366 }
367
368 static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
369 struct dentry *dentry)
370 {
371 struct inode *inode = d_inode(old_dentry);
372 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
373 int err;
374
375 if (unlikely(f2fs_cp_error(sbi)))
376 return -EIO;
377 if (!f2fs_is_checkpoint_ready(sbi))
378 return -ENOSPC;
379
380 err = fscrypt_prepare_link(old_dentry, dir, dentry);
381 if (err)
382 return err;
383
384 if (is_inode_flag_set(dir, FI_PROJ_INHERIT) &&
385 (!projid_eq(F2FS_I(dir)->i_projid,
386 F2FS_I(old_dentry->d_inode)->i_projid)))
387 return -EXDEV;
388
389 err = dquot_initialize(dir);
390 if (err)
391 return err;
392
393 f2fs_balance_fs(sbi, true);
394
395 inode->i_ctime = current_time(inode);
396 ihold(inode);
397
398 set_inode_flag(inode, FI_INC_LINK);
399 f2fs_lock_op(sbi);
400 err = f2fs_add_link(dentry, inode);
401 if (err)
402 goto out;
403 f2fs_unlock_op(sbi);
404
405 d_instantiate(dentry, inode);
406
407 if (IS_DIRSYNC(dir))
408 f2fs_sync_fs(sbi->sb, 1);
409 return 0;
410 out:
411 clear_inode_flag(inode, FI_INC_LINK);
412 iput(inode);
413 f2fs_unlock_op(sbi);
414 return err;
415 }
416
417 struct dentry *f2fs_get_parent(struct dentry *child)
418 {
419 struct qstr dotdot = QSTR_INIT("..", 2);
420 struct page *page;
421 unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot, &page);
422 if (!ino) {
423 if (IS_ERR(page))
424 return ERR_CAST(page);
425 return ERR_PTR(-ENOENT);
426 }
427 return d_obtain_alias(f2fs_iget(child->d_sb, ino));
428 }
429
430 static int __recover_dot_dentries(struct inode *dir, nid_t pino)
431 {
432 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
433 struct qstr dot = QSTR_INIT(".", 1);
434 struct qstr dotdot = QSTR_INIT("..", 2);
435 struct f2fs_dir_entry *de;
436 struct page *page;
437 int err = 0;
438
439 if (f2fs_readonly(sbi->sb)) {
440 f2fs_info(sbi, "skip recovering inline_dots inode (ino:%lu, pino:%u) in readonly mountpoint",
441 dir->i_ino, pino);
442 return 0;
443 }
444
445 err = dquot_initialize(dir);
446 if (err)
447 return err;
448
449 f2fs_balance_fs(sbi, true);
450
451 f2fs_lock_op(sbi);
452
453 de = f2fs_find_entry(dir, &dot, &page);
454 if (de) {
455 f2fs_put_page(page, 0);
456 } else if (IS_ERR(page)) {
457 err = PTR_ERR(page);
458 goto out;
459 } else {
460 err = f2fs_do_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR);
461 if (err)
462 goto out;
463 }
464
465 de = f2fs_find_entry(dir, &dotdot, &page);
466 if (de)
467 f2fs_put_page(page, 0);
468 else if (IS_ERR(page))
469 err = PTR_ERR(page);
470 else
471 err = f2fs_do_add_link(dir, &dotdot, NULL, pino, S_IFDIR);
472 out:
473 if (!err)
474 clear_inode_flag(dir, FI_INLINE_DOTS);
475
476 f2fs_unlock_op(sbi);
477 return err;
478 }
479
480 static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
481 unsigned int flags)
482 {
483 struct inode *inode = NULL;
484 struct f2fs_dir_entry *de;
485 struct page *page;
486 struct dentry *new;
487 nid_t ino = -1;
488 int err = 0;
489 unsigned int root_ino = F2FS_ROOT_INO(F2FS_I_SB(dir));
490 struct f2fs_filename fname;
491
492 trace_f2fs_lookup_start(dir, dentry, flags);
493
494 if (dentry->d_name.len > F2FS_NAME_LEN) {
495 err = -ENAMETOOLONG;
496 goto out;
497 }
498
499 err = f2fs_prepare_lookup(dir, dentry, &fname);
500 generic_set_encrypted_ci_d_ops(dentry);
501 if (err == -ENOENT)
502 goto out_splice;
503 if (err)
504 goto out;
505 de = __f2fs_find_entry(dir, &fname, &page);
506 f2fs_free_filename(&fname);
507
508 if (!de) {
509 if (IS_ERR(page)) {
510 err = PTR_ERR(page);
511 goto out;
512 }
513 err = -ENOENT;
514 goto out_splice;
515 }
516
517 ino = le32_to_cpu(de->ino);
518 f2fs_put_page(page, 0);
519
520 inode = f2fs_iget(dir->i_sb, ino);
521 if (IS_ERR(inode)) {
522 err = PTR_ERR(inode);
523 goto out;
524 }
525
526 if ((dir->i_ino == root_ino) && f2fs_has_inline_dots(dir)) {
527 err = __recover_dot_dentries(dir, root_ino);
528 if (err)
529 goto out_iput;
530 }
531
532 if (f2fs_has_inline_dots(inode)) {
533 err = __recover_dot_dentries(inode, dir->i_ino);
534 if (err)
535 goto out_iput;
536 }
537 if (IS_ENCRYPTED(dir) &&
538 (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
539 !fscrypt_has_permitted_context(dir, inode)) {
540 f2fs_warn(F2FS_I_SB(inode), "Inconsistent encryption contexts: %lu/%lu",
541 dir->i_ino, inode->i_ino);
542 err = -EPERM;
543 goto out_iput;
544 }
545 out_splice:
546 #ifdef CONFIG_UNICODE
547 if (!inode && IS_CASEFOLDED(dir)) {
548 /* Eventually we want to call d_add_ci(dentry, NULL)
549 * for negative dentries in the encoding case as
550 * well. For now, prevent the negative dentry
551 * from being cached.
552 */
553 trace_f2fs_lookup_end(dir, dentry, ino, err);
554 return NULL;
555 }
556 #endif
557 new = d_splice_alias(inode, dentry);
558 err = PTR_ERR_OR_ZERO(new);
559 trace_f2fs_lookup_end(dir, dentry, ino, !new ? -ENOENT : err);
560 return new;
561 out_iput:
562 iput(inode);
563 out:
564 trace_f2fs_lookup_end(dir, dentry, ino, err);
565 return ERR_PTR(err);
566 }
567
568 static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
569 {
570 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
571 struct inode *inode = d_inode(dentry);
572 struct f2fs_dir_entry *de;
573 struct page *page;
574 int err;
575
576 trace_f2fs_unlink_enter(dir, dentry);
577
578 if (unlikely(f2fs_cp_error(sbi))) {
579 err = -EIO;
580 goto fail;
581 }
582
583 err = dquot_initialize(dir);
584 if (err)
585 goto fail;
586 err = dquot_initialize(inode);
587 if (err)
588 goto fail;
589
590 de = f2fs_find_entry(dir, &dentry->d_name, &page);
591 if (!de) {
592 if (IS_ERR(page))
593 err = PTR_ERR(page);
594 goto fail;
595 }
596
597 f2fs_balance_fs(sbi, true);
598
599 f2fs_lock_op(sbi);
600 err = f2fs_acquire_orphan_inode(sbi);
601 if (err) {
602 f2fs_unlock_op(sbi);
603 f2fs_put_page(page, 0);
604 goto fail;
605 }
606 f2fs_delete_entry(de, page, dir, inode);
607 #ifdef CONFIG_UNICODE
608 /* VFS negative dentries are incompatible with Encoding and
609 * Case-insensitiveness. Eventually we'll want avoid
610 * invalidating the dentries here, alongside with returning the
611 * negative dentries at f2fs_lookup(), when it is better
612 * supported by the VFS for the CI case.
613 */
614 if (IS_CASEFOLDED(dir))
615 d_invalidate(dentry);
616 #endif
617 f2fs_unlock_op(sbi);
618
619 if (IS_DIRSYNC(dir))
620 f2fs_sync_fs(sbi->sb, 1);
621 fail:
622 trace_f2fs_unlink_exit(inode, err);
623 return err;
624 }
625
626 static const char *f2fs_get_link(struct dentry *dentry,
627 struct inode *inode,
628 struct delayed_call *done)
629 {
630 const char *link = page_get_link(dentry, inode, done);
631 if (!IS_ERR(link) && !*link) {
632 /* this is broken symlink case */
633 do_delayed_call(done);
634 clear_delayed_call(done);
635 link = ERR_PTR(-ENOENT);
636 }
637 return link;
638 }
639
640 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
641 const char *symname)
642 {
643 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
644 struct inode *inode;
645 size_t len = strlen(symname);
646 struct fscrypt_str disk_link;
647 int err;
648
649 if (unlikely(f2fs_cp_error(sbi)))
650 return -EIO;
651 if (!f2fs_is_checkpoint_ready(sbi))
652 return -ENOSPC;
653
654 err = fscrypt_prepare_symlink(dir, symname, len, dir->i_sb->s_blocksize,
655 &disk_link);
656 if (err)
657 return err;
658
659 err = dquot_initialize(dir);
660 if (err)
661 return err;
662
663 inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
664 if (IS_ERR(inode))
665 return PTR_ERR(inode);
666
667 if (IS_ENCRYPTED(inode))
668 inode->i_op = &f2fs_encrypted_symlink_inode_operations;
669 else
670 inode->i_op = &f2fs_symlink_inode_operations;
671 inode_nohighmem(inode);
672 inode->i_mapping->a_ops = &f2fs_dblock_aops;
673
674 f2fs_lock_op(sbi);
675 err = f2fs_add_link(dentry, inode);
676 if (err)
677 goto out_f2fs_handle_failed_inode;
678 f2fs_unlock_op(sbi);
679 f2fs_alloc_nid_done(sbi, inode->i_ino);
680
681 err = fscrypt_encrypt_symlink(inode, symname, len, &disk_link);
682 if (err)
683 goto err_out;
684
685 err = page_symlink(inode, disk_link.name, disk_link.len);
686
687 err_out:
688 d_instantiate_new(dentry, inode);
689
690 /*
691 * Let's flush symlink data in order to avoid broken symlink as much as
692 * possible. Nevertheless, fsyncing is the best way, but there is no
693 * way to get a file descriptor in order to flush that.
694 *
695 * Note that, it needs to do dir->fsync to make this recoverable.
696 * If the symlink path is stored into inline_data, there is no
697 * performance regression.
698 */
699 if (!err) {
700 filemap_write_and_wait_range(inode->i_mapping, 0,
701 disk_link.len - 1);
702
703 if (IS_DIRSYNC(dir))
704 f2fs_sync_fs(sbi->sb, 1);
705 } else {
706 f2fs_unlink(dir, dentry);
707 }
708
709 f2fs_balance_fs(sbi, true);
710 goto out_free_encrypted_link;
711
712 out_f2fs_handle_failed_inode:
713 f2fs_handle_failed_inode(inode);
714 out_free_encrypted_link:
715 if (disk_link.name != (unsigned char *)symname)
716 kfree(disk_link.name);
717 return err;
718 }
719
720 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
721 {
722 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
723 struct inode *inode;
724 int err;
725
726 if (unlikely(f2fs_cp_error(sbi)))
727 return -EIO;
728
729 err = dquot_initialize(dir);
730 if (err)
731 return err;
732
733 inode = f2fs_new_inode(dir, S_IFDIR | mode);
734 if (IS_ERR(inode))
735 return PTR_ERR(inode);
736
737 inode->i_op = &f2fs_dir_inode_operations;
738 inode->i_fop = &f2fs_dir_operations;
739 inode->i_mapping->a_ops = &f2fs_dblock_aops;
740 inode_nohighmem(inode);
741
742 set_inode_flag(inode, FI_INC_LINK);
743 f2fs_lock_op(sbi);
744 err = f2fs_add_link(dentry, inode);
745 if (err)
746 goto out_fail;
747 f2fs_unlock_op(sbi);
748
749 f2fs_alloc_nid_done(sbi, inode->i_ino);
750
751 d_instantiate_new(dentry, inode);
752
753 if (IS_DIRSYNC(dir))
754 f2fs_sync_fs(sbi->sb, 1);
755
756 f2fs_balance_fs(sbi, true);
757 return 0;
758
759 out_fail:
760 clear_inode_flag(inode, FI_INC_LINK);
761 f2fs_handle_failed_inode(inode);
762 return err;
763 }
764
765 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
766 {
767 struct inode *inode = d_inode(dentry);
768 if (f2fs_empty_dir(inode))
769 return f2fs_unlink(dir, dentry);
770 return -ENOTEMPTY;
771 }
772
773 static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
774 umode_t mode, dev_t rdev)
775 {
776 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
777 struct inode *inode;
778 int err = 0;
779
780 if (unlikely(f2fs_cp_error(sbi)))
781 return -EIO;
782 if (!f2fs_is_checkpoint_ready(sbi))
783 return -ENOSPC;
784
785 err = dquot_initialize(dir);
786 if (err)
787 return err;
788
789 inode = f2fs_new_inode(dir, mode);
790 if (IS_ERR(inode))
791 return PTR_ERR(inode);
792
793 init_special_inode(inode, inode->i_mode, rdev);
794 inode->i_op = &f2fs_special_inode_operations;
795
796 f2fs_lock_op(sbi);
797 err = f2fs_add_link(dentry, inode);
798 if (err)
799 goto out;
800 f2fs_unlock_op(sbi);
801
802 f2fs_alloc_nid_done(sbi, inode->i_ino);
803
804 d_instantiate_new(dentry, inode);
805
806 if (IS_DIRSYNC(dir))
807 f2fs_sync_fs(sbi->sb, 1);
808
809 f2fs_balance_fs(sbi, true);
810 return 0;
811 out:
812 f2fs_handle_failed_inode(inode);
813 return err;
814 }
815
816 static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
817 umode_t mode, struct inode **whiteout)
818 {
819 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
820 struct inode *inode;
821 int err;
822
823 err = dquot_initialize(dir);
824 if (err)
825 return err;
826
827 inode = f2fs_new_inode(dir, mode);
828 if (IS_ERR(inode))
829 return PTR_ERR(inode);
830
831 if (whiteout) {
832 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
833 inode->i_op = &f2fs_special_inode_operations;
834 } else {
835 inode->i_op = &f2fs_file_inode_operations;
836 inode->i_fop = &f2fs_file_operations;
837 inode->i_mapping->a_ops = &f2fs_dblock_aops;
838 }
839
840 f2fs_lock_op(sbi);
841 err = f2fs_acquire_orphan_inode(sbi);
842 if (err)
843 goto out;
844
845 err = f2fs_do_tmpfile(inode, dir);
846 if (err)
847 goto release_out;
848
849 /*
850 * add this non-linked tmpfile to orphan list, in this way we could
851 * remove all unused data of tmpfile after abnormal power-off.
852 */
853 f2fs_add_orphan_inode(inode);
854 f2fs_alloc_nid_done(sbi, inode->i_ino);
855
856 if (whiteout) {
857 f2fs_i_links_write(inode, false);
858 inode->i_state |= I_LINKABLE;
859 *whiteout = inode;
860 } else {
861 d_tmpfile(dentry, inode);
862 }
863 /* link_count was changed by d_tmpfile as well. */
864 f2fs_unlock_op(sbi);
865 unlock_new_inode(inode);
866
867 f2fs_balance_fs(sbi, true);
868 return 0;
869
870 release_out:
871 f2fs_release_orphan_inode(sbi);
872 out:
873 f2fs_handle_failed_inode(inode);
874 return err;
875 }
876
877 static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
878 {
879 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
880
881 if (unlikely(f2fs_cp_error(sbi)))
882 return -EIO;
883 if (!f2fs_is_checkpoint_ready(sbi))
884 return -ENOSPC;
885
886 return __f2fs_tmpfile(dir, dentry, mode, NULL);
887 }
888
889 static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout)
890 {
891 if (unlikely(f2fs_cp_error(F2FS_I_SB(dir))))
892 return -EIO;
893
894 return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout);
895 }
896
897 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
898 struct inode *new_dir, struct dentry *new_dentry,
899 unsigned int flags)
900 {
901 struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
902 struct inode *old_inode = d_inode(old_dentry);
903 struct inode *new_inode = d_inode(new_dentry);
904 struct inode *whiteout = NULL;
905 struct page *old_dir_page = NULL;
906 struct page *old_page, *new_page = NULL;
907 struct f2fs_dir_entry *old_dir_entry = NULL;
908 struct f2fs_dir_entry *old_entry;
909 struct f2fs_dir_entry *new_entry;
910 int err;
911
912 if (unlikely(f2fs_cp_error(sbi)))
913 return -EIO;
914 if (!f2fs_is_checkpoint_ready(sbi))
915 return -ENOSPC;
916
917 if (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
918 (!projid_eq(F2FS_I(new_dir)->i_projid,
919 F2FS_I(old_dentry->d_inode)->i_projid)))
920 return -EXDEV;
921
922 /*
923 * If new_inode is null, the below renaming flow will
924 * add a link in old_dir which can conver inline_dir.
925 * After then, if we failed to get the entry due to other
926 * reasons like ENOMEM, we had to remove the new entry.
927 * Instead of adding such the error handling routine, let's
928 * simply convert first here.
929 */
930 if (old_dir == new_dir && !new_inode) {
931 err = f2fs_try_convert_inline_dir(old_dir, new_dentry);
932 if (err)
933 return err;
934 }
935
936 if (flags & RENAME_WHITEOUT) {
937 err = f2fs_create_whiteout(old_dir, &whiteout);
938 if (err)
939 return err;
940 }
941
942 err = dquot_initialize(old_dir);
943 if (err)
944 goto out;
945
946 err = dquot_initialize(new_dir);
947 if (err)
948 goto out;
949
950 if (new_inode) {
951 err = dquot_initialize(new_inode);
952 if (err)
953 goto out;
954 }
955
956 err = -ENOENT;
957 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
958 if (!old_entry) {
959 if (IS_ERR(old_page))
960 err = PTR_ERR(old_page);
961 goto out;
962 }
963
964 if (S_ISDIR(old_inode->i_mode)) {
965 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
966 if (!old_dir_entry) {
967 if (IS_ERR(old_dir_page))
968 err = PTR_ERR(old_dir_page);
969 goto out_old;
970 }
971 }
972
973 if (new_inode) {
974
975 err = -ENOTEMPTY;
976 if (old_dir_entry && !f2fs_empty_dir(new_inode))
977 goto out_dir;
978
979 err = -ENOENT;
980 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
981 &new_page);
982 if (!new_entry) {
983 if (IS_ERR(new_page))
984 err = PTR_ERR(new_page);
985 goto out_dir;
986 }
987
988 f2fs_balance_fs(sbi, true);
989
990 f2fs_lock_op(sbi);
991
992 err = f2fs_acquire_orphan_inode(sbi);
993 if (err)
994 goto put_out_dir;
995
996 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
997 new_page = NULL;
998
999 new_inode->i_ctime = current_time(new_inode);
1000 down_write(&F2FS_I(new_inode)->i_sem);
1001 if (old_dir_entry)
1002 f2fs_i_links_write(new_inode, false);
1003 f2fs_i_links_write(new_inode, false);
1004 up_write(&F2FS_I(new_inode)->i_sem);
1005
1006 if (!new_inode->i_nlink)
1007 f2fs_add_orphan_inode(new_inode);
1008 else
1009 f2fs_release_orphan_inode(sbi);
1010 } else {
1011 f2fs_balance_fs(sbi, true);
1012
1013 f2fs_lock_op(sbi);
1014
1015 err = f2fs_add_link(new_dentry, old_inode);
1016 if (err) {
1017 f2fs_unlock_op(sbi);
1018 goto out_dir;
1019 }
1020
1021 if (old_dir_entry)
1022 f2fs_i_links_write(new_dir, true);
1023 }
1024
1025 down_write(&F2FS_I(old_inode)->i_sem);
1026 if (!old_dir_entry || whiteout)
1027 file_lost_pino(old_inode);
1028 else
1029 /* adjust dir's i_pino to pass fsck check */
1030 f2fs_i_pino_write(old_inode, new_dir->i_ino);
1031 up_write(&F2FS_I(old_inode)->i_sem);
1032
1033 old_inode->i_ctime = current_time(old_inode);
1034 f2fs_mark_inode_dirty_sync(old_inode, false);
1035
1036 f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
1037 old_page = NULL;
1038
1039 if (whiteout) {
1040 set_inode_flag(whiteout, FI_INC_LINK);
1041 err = f2fs_add_link(old_dentry, whiteout);
1042 if (err)
1043 goto put_out_dir;
1044 whiteout->i_state &= ~I_LINKABLE;
1045 iput(whiteout);
1046 }
1047
1048 if (old_dir_entry) {
1049 if (old_dir != new_dir && !whiteout)
1050 f2fs_set_link(old_inode, old_dir_entry,
1051 old_dir_page, new_dir);
1052 else
1053 f2fs_put_page(old_dir_page, 0);
1054 f2fs_i_links_write(old_dir, false);
1055 }
1056 if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) {
1057 f2fs_add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
1058 if (S_ISDIR(old_inode->i_mode))
1059 f2fs_add_ino_entry(sbi, old_inode->i_ino,
1060 TRANS_DIR_INO);
1061 }
1062
1063 f2fs_unlock_op(sbi);
1064
1065 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
1066 f2fs_sync_fs(sbi->sb, 1);
1067
1068 f2fs_update_time(sbi, REQ_TIME);
1069 return 0;
1070
1071 put_out_dir:
1072 f2fs_unlock_op(sbi);
1073 f2fs_put_page(new_page, 0);
1074 out_dir:
1075 if (old_dir_entry)
1076 f2fs_put_page(old_dir_page, 0);
1077 out_old:
1078 f2fs_put_page(old_page, 0);
1079 out:
1080 if (whiteout)
1081 iput(whiteout);
1082 return err;
1083 }
1084
1085 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
1086 struct inode *new_dir, struct dentry *new_dentry)
1087 {
1088 struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
1089 struct inode *old_inode = d_inode(old_dentry);
1090 struct inode *new_inode = d_inode(new_dentry);
1091 struct page *old_dir_page, *new_dir_page;
1092 struct page *old_page, *new_page;
1093 struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
1094 struct f2fs_dir_entry *old_entry, *new_entry;
1095 int old_nlink = 0, new_nlink = 0;
1096 int err;
1097
1098 if (unlikely(f2fs_cp_error(sbi)))
1099 return -EIO;
1100 if (!f2fs_is_checkpoint_ready(sbi))
1101 return -ENOSPC;
1102
1103 if ((is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1104 !projid_eq(F2FS_I(new_dir)->i_projid,
1105 F2FS_I(old_dentry->d_inode)->i_projid)) ||
1106 (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1107 !projid_eq(F2FS_I(old_dir)->i_projid,
1108 F2FS_I(new_dentry->d_inode)->i_projid)))
1109 return -EXDEV;
1110
1111 err = dquot_initialize(old_dir);
1112 if (err)
1113 goto out;
1114
1115 err = dquot_initialize(new_dir);
1116 if (err)
1117 goto out;
1118
1119 err = -ENOENT;
1120 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
1121 if (!old_entry) {
1122 if (IS_ERR(old_page))
1123 err = PTR_ERR(old_page);
1124 goto out;
1125 }
1126
1127 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
1128 if (!new_entry) {
1129 if (IS_ERR(new_page))
1130 err = PTR_ERR(new_page);
1131 goto out_old;
1132 }
1133
1134 /* prepare for updating ".." directory entry info later */
1135 if (old_dir != new_dir) {
1136 if (S_ISDIR(old_inode->i_mode)) {
1137 old_dir_entry = f2fs_parent_dir(old_inode,
1138 &old_dir_page);
1139 if (!old_dir_entry) {
1140 if (IS_ERR(old_dir_page))
1141 err = PTR_ERR(old_dir_page);
1142 goto out_new;
1143 }
1144 }
1145
1146 if (S_ISDIR(new_inode->i_mode)) {
1147 new_dir_entry = f2fs_parent_dir(new_inode,
1148 &new_dir_page);
1149 if (!new_dir_entry) {
1150 if (IS_ERR(new_dir_page))
1151 err = PTR_ERR(new_dir_page);
1152 goto out_old_dir;
1153 }
1154 }
1155 }
1156
1157 /*
1158 * If cross rename between file and directory those are not
1159 * in the same directory, we will inc nlink of file's parent
1160 * later, so we should check upper boundary of its nlink.
1161 */
1162 if ((!old_dir_entry || !new_dir_entry) &&
1163 old_dir_entry != new_dir_entry) {
1164 old_nlink = old_dir_entry ? -1 : 1;
1165 new_nlink = -old_nlink;
1166 err = -EMLINK;
1167 if ((old_nlink > 0 && old_dir->i_nlink >= F2FS_LINK_MAX) ||
1168 (new_nlink > 0 && new_dir->i_nlink >= F2FS_LINK_MAX))
1169 goto out_new_dir;
1170 }
1171
1172 f2fs_balance_fs(sbi, true);
1173
1174 f2fs_lock_op(sbi);
1175
1176 /* update ".." directory entry info of old dentry */
1177 if (old_dir_entry)
1178 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
1179
1180 /* update ".." directory entry info of new dentry */
1181 if (new_dir_entry)
1182 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
1183
1184 /* update directory entry info of old dir inode */
1185 f2fs_set_link(old_dir, old_entry, old_page, new_inode);
1186
1187 down_write(&F2FS_I(old_inode)->i_sem);
1188 if (!old_dir_entry)
1189 file_lost_pino(old_inode);
1190 else
1191 /* adjust dir's i_pino to pass fsck check */
1192 f2fs_i_pino_write(old_inode, new_dir->i_ino);
1193 up_write(&F2FS_I(old_inode)->i_sem);
1194
1195 old_dir->i_ctime = current_time(old_dir);
1196 if (old_nlink) {
1197 down_write(&F2FS_I(old_dir)->i_sem);
1198 f2fs_i_links_write(old_dir, old_nlink > 0);
1199 up_write(&F2FS_I(old_dir)->i_sem);
1200 }
1201 f2fs_mark_inode_dirty_sync(old_dir, false);
1202
1203 /* update directory entry info of new dir inode */
1204 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
1205
1206 down_write(&F2FS_I(new_inode)->i_sem);
1207 if (!new_dir_entry)
1208 file_lost_pino(new_inode);
1209 else
1210 /* adjust dir's i_pino to pass fsck check */
1211 f2fs_i_pino_write(new_inode, old_dir->i_ino);
1212 up_write(&F2FS_I(new_inode)->i_sem);
1213
1214 new_dir->i_ctime = current_time(new_dir);
1215 if (new_nlink) {
1216 down_write(&F2FS_I(new_dir)->i_sem);
1217 f2fs_i_links_write(new_dir, new_nlink > 0);
1218 up_write(&F2FS_I(new_dir)->i_sem);
1219 }
1220 f2fs_mark_inode_dirty_sync(new_dir, false);
1221
1222 if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) {
1223 f2fs_add_ino_entry(sbi, old_dir->i_ino, TRANS_DIR_INO);
1224 f2fs_add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
1225 }
1226
1227 f2fs_unlock_op(sbi);
1228
1229 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
1230 f2fs_sync_fs(sbi->sb, 1);
1231
1232 f2fs_update_time(sbi, REQ_TIME);
1233 return 0;
1234 out_new_dir:
1235 if (new_dir_entry) {
1236 f2fs_put_page(new_dir_page, 0);
1237 }
1238 out_old_dir:
1239 if (old_dir_entry) {
1240 f2fs_put_page(old_dir_page, 0);
1241 }
1242 out_new:
1243 f2fs_put_page(new_page, 0);
1244 out_old:
1245 f2fs_put_page(old_page, 0);
1246 out:
1247 return err;
1248 }
1249
1250 static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
1251 struct inode *new_dir, struct dentry *new_dentry,
1252 unsigned int flags)
1253 {
1254 int err;
1255
1256 if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
1257 return -EINVAL;
1258
1259 err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry,
1260 flags);
1261 if (err)
1262 return err;
1263
1264 if (flags & RENAME_EXCHANGE) {
1265 return f2fs_cross_rename(old_dir, old_dentry,
1266 new_dir, new_dentry);
1267 }
1268 /*
1269 * VFS has already handled the new dentry existence case,
1270 * here, we just deal with "RENAME_NOREPLACE" as regular rename.
1271 */
1272 return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
1273 }
1274
1275 static const char *f2fs_encrypted_get_link(struct dentry *dentry,
1276 struct inode *inode,
1277 struct delayed_call *done)
1278 {
1279 struct page *page;
1280 const char *target;
1281
1282 if (!dentry)
1283 return ERR_PTR(-ECHILD);
1284
1285 page = read_mapping_page(inode->i_mapping, 0, NULL);
1286 if (IS_ERR(page))
1287 return ERR_CAST(page);
1288
1289 target = fscrypt_get_symlink(inode, page_address(page),
1290 inode->i_sb->s_blocksize, done);
1291 put_page(page);
1292 return target;
1293 }
1294
1295 const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
1296 .get_link = f2fs_encrypted_get_link,
1297 .getattr = f2fs_getattr,
1298 .setattr = f2fs_setattr,
1299 .listxattr = f2fs_listxattr,
1300 };
1301
1302 const struct inode_operations f2fs_dir_inode_operations = {
1303 .create = f2fs_create,
1304 .lookup = f2fs_lookup,
1305 .link = f2fs_link,
1306 .unlink = f2fs_unlink,
1307 .symlink = f2fs_symlink,
1308 .mkdir = f2fs_mkdir,
1309 .rmdir = f2fs_rmdir,
1310 .mknod = f2fs_mknod,
1311 .rename = f2fs_rename2,
1312 .tmpfile = f2fs_tmpfile,
1313 .getattr = f2fs_getattr,
1314 .setattr = f2fs_setattr,
1315 .get_acl = f2fs_get_acl,
1316 .set_acl = f2fs_set_acl,
1317 .listxattr = f2fs_listxattr,
1318 .fiemap = f2fs_fiemap,
1319 };
1320
1321 const struct inode_operations f2fs_symlink_inode_operations = {
1322 .get_link = f2fs_get_link,
1323 .getattr = f2fs_getattr,
1324 .setattr = f2fs_setattr,
1325 .listxattr = f2fs_listxattr,
1326 };
1327
1328 const struct inode_operations f2fs_special_inode_operations = {
1329 .getattr = f2fs_getattr,
1330 .setattr = f2fs_setattr,
1331 .get_acl = f2fs_get_acl,
1332 .set_acl = f2fs_set_acl,
1333 .listxattr = f2fs_listxattr,
1334 };
Linux with added FPC-III support