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
f2fs_new_inode(struct inode * dir,umode_t mode)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
is_extension_exist(const unsigned char * s,const char * sub)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 */
set_file_temperature(struct f2fs_sb_info * sbi,struct inode * inode,const unsigned char * name)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
f2fs_update_extension_list(struct f2fs_sb_info * sbi,const char * name,bool hot,bool set)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
set_compress_inode(struct f2fs_sb_info * sbi,struct inode * inode,const unsigned char * name)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
f2fs_create(struct inode * dir,struct dentry * dentry,umode_t mode,bool excl)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
f2fs_link(struct dentry * old_dentry,struct inode * dir,struct dentry * dentry)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
f2fs_get_parent(struct dentry * child)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
__recover_dot_dentries(struct inode * dir,nid_t pino)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
f2fs_lookup(struct inode * dir,struct dentry * dentry,unsigned int flags)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 if (err == -ENOENT)
501 goto out_splice;
502 if (err)
503 goto out;
504 de = __f2fs_find_entry(dir, &fname, &page);
505 f2fs_free_filename(&fname);
506
507 if (!de) {
508 if (IS_ERR(page)) {
509 err = PTR_ERR(page);
510 goto out;
511 }
512 err = -ENOENT;
513 goto out_splice;
514 }
515
516 ino = le32_to_cpu(de->ino);
517 f2fs_put_page(page, 0);
518
519 inode = f2fs_iget(dir->i_sb, ino);
520 if (IS_ERR(inode)) {
521 err = PTR_ERR(inode);
522 goto out;
523 }
524
525 if ((dir->i_ino == root_ino) && f2fs_has_inline_dots(dir)) {
526 err = __recover_dot_dentries(dir, root_ino);
527 if (err)
528 goto out_iput;
529 }
530
531 if (f2fs_has_inline_dots(inode)) {
532 err = __recover_dot_dentries(inode, dir->i_ino);
533 if (err)
534 goto out_iput;
535 }
536 if (IS_ENCRYPTED(dir) &&
537 (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
538 !fscrypt_has_permitted_context(dir, inode)) {
539 f2fs_warn(F2FS_I_SB(inode), "Inconsistent encryption contexts: %lu/%lu",
540 dir->i_ino, inode->i_ino);
541 err = -EPERM;
542 goto out_iput;
543 }
544 out_splice:
545 #ifdef CONFIG_UNICODE
546 if (!inode && IS_CASEFOLDED(dir)) {
547 /* Eventually we want to call d_add_ci(dentry, NULL)
548 * for negative dentries in the encoding case as
549 * well. For now, prevent the negative dentry
550 * from being cached.
551 */
552 trace_f2fs_lookup_end(dir, dentry, ino, err);
553 return NULL;
554 }
555 #endif
556 new = d_splice_alias(inode, dentry);
557 err = PTR_ERR_OR_ZERO(new);
558 trace_f2fs_lookup_end(dir, dentry, ino, !new ? -ENOENT : err);
559 return new;
560 out_iput:
561 iput(inode);
562 out:
563 trace_f2fs_lookup_end(dir, dentry, ino, err);
564 return ERR_PTR(err);
565 }
566
f2fs_unlink(struct inode * dir,struct dentry * dentry)567 static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
568 {
569 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
570 struct inode *inode = d_inode(dentry);
571 struct f2fs_dir_entry *de;
572 struct page *page;
573 int err;
574
575 trace_f2fs_unlink_enter(dir, dentry);
576
577 if (unlikely(f2fs_cp_error(sbi))) {
578 err = -EIO;
579 goto fail;
580 }
581
582 err = dquot_initialize(dir);
583 if (err)
584 goto fail;
585 err = dquot_initialize(inode);
586 if (err)
587 goto fail;
588
589 de = f2fs_find_entry(dir, &dentry->d_name, &page);
590 if (!de) {
591 if (IS_ERR(page))
592 err = PTR_ERR(page);
593 goto fail;
594 }
595
596 f2fs_balance_fs(sbi, true);
597
598 f2fs_lock_op(sbi);
599 err = f2fs_acquire_orphan_inode(sbi);
600 if (err) {
601 f2fs_unlock_op(sbi);
602 f2fs_put_page(page, 0);
603 goto fail;
604 }
605 f2fs_delete_entry(de, page, dir, inode);
606 #ifdef CONFIG_UNICODE
607 /* VFS negative dentries are incompatible with Encoding and
608 * Case-insensitiveness. Eventually we'll want avoid
609 * invalidating the dentries here, alongside with returning the
610 * negative dentries at f2fs_lookup(), when it is better
611 * supported by the VFS for the CI case.
612 */
613 if (IS_CASEFOLDED(dir))
614 d_invalidate(dentry);
615 #endif
616 f2fs_unlock_op(sbi);
617
618 if (IS_DIRSYNC(dir))
619 f2fs_sync_fs(sbi->sb, 1);
620 fail:
621 trace_f2fs_unlink_exit(inode, err);
622 return err;
623 }
624
f2fs_get_link(struct dentry * dentry,struct inode * inode,struct delayed_call * done)625 static const char *f2fs_get_link(struct dentry *dentry,
626 struct inode *inode,
627 struct delayed_call *done)
628 {
629 const char *link = page_get_link(dentry, inode, done);
630 if (!IS_ERR(link) && !*link) {
631 /* this is broken symlink case */
632 do_delayed_call(done);
633 clear_delayed_call(done);
634 link = ERR_PTR(-ENOENT);
635 }
636 return link;
637 }
638
f2fs_symlink(struct inode * dir,struct dentry * dentry,const char * symname)639 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
640 const char *symname)
641 {
642 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
643 struct inode *inode;
644 size_t len = strlen(symname);
645 struct fscrypt_str disk_link;
646 int err;
647
648 if (unlikely(f2fs_cp_error(sbi)))
649 return -EIO;
650 if (!f2fs_is_checkpoint_ready(sbi))
651 return -ENOSPC;
652
653 err = fscrypt_prepare_symlink(dir, symname, len, dir->i_sb->s_blocksize,
654 &disk_link);
655 if (err)
656 return err;
657
658 err = dquot_initialize(dir);
659 if (err)
660 return err;
661
662 inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
663 if (IS_ERR(inode))
664 return PTR_ERR(inode);
665
666 if (IS_ENCRYPTED(inode))
667 inode->i_op = &f2fs_encrypted_symlink_inode_operations;
668 else
669 inode->i_op = &f2fs_symlink_inode_operations;
670 inode_nohighmem(inode);
671 inode->i_mapping->a_ops = &f2fs_dblock_aops;
672
673 f2fs_lock_op(sbi);
674 err = f2fs_add_link(dentry, inode);
675 if (err)
676 goto out_f2fs_handle_failed_inode;
677 f2fs_unlock_op(sbi);
678 f2fs_alloc_nid_done(sbi, inode->i_ino);
679
680 err = fscrypt_encrypt_symlink(inode, symname, len, &disk_link);
681 if (err)
682 goto err_out;
683
684 err = page_symlink(inode, disk_link.name, disk_link.len);
685
686 err_out:
687 d_instantiate_new(dentry, inode);
688
689 /*
690 * Let's flush symlink data in order to avoid broken symlink as much as
691 * possible. Nevertheless, fsyncing is the best way, but there is no
692 * way to get a file descriptor in order to flush that.
693 *
694 * Note that, it needs to do dir->fsync to make this recoverable.
695 * If the symlink path is stored into inline_data, there is no
696 * performance regression.
697 */
698 if (!err) {
699 filemap_write_and_wait_range(inode->i_mapping, 0,
700 disk_link.len - 1);
701
702 if (IS_DIRSYNC(dir))
703 f2fs_sync_fs(sbi->sb, 1);
704 } else {
705 f2fs_unlink(dir, dentry);
706 }
707
708 f2fs_balance_fs(sbi, true);
709 goto out_free_encrypted_link;
710
711 out_f2fs_handle_failed_inode:
712 f2fs_handle_failed_inode(inode);
713 out_free_encrypted_link:
714 if (disk_link.name != (unsigned char *)symname)
715 kfree(disk_link.name);
716 return err;
717 }
718
f2fs_mkdir(struct inode * dir,struct dentry * dentry,umode_t mode)719 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
720 {
721 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
722 struct inode *inode;
723 int err;
724
725 if (unlikely(f2fs_cp_error(sbi)))
726 return -EIO;
727
728 err = dquot_initialize(dir);
729 if (err)
730 return err;
731
732 inode = f2fs_new_inode(dir, S_IFDIR | mode);
733 if (IS_ERR(inode))
734 return PTR_ERR(inode);
735
736 inode->i_op = &f2fs_dir_inode_operations;
737 inode->i_fop = &f2fs_dir_operations;
738 inode->i_mapping->a_ops = &f2fs_dblock_aops;
739 inode_nohighmem(inode);
740
741 set_inode_flag(inode, FI_INC_LINK);
742 f2fs_lock_op(sbi);
743 err = f2fs_add_link(dentry, inode);
744 if (err)
745 goto out_fail;
746 f2fs_unlock_op(sbi);
747
748 f2fs_alloc_nid_done(sbi, inode->i_ino);
749
750 d_instantiate_new(dentry, inode);
751
752 if (IS_DIRSYNC(dir))
753 f2fs_sync_fs(sbi->sb, 1);
754
755 f2fs_balance_fs(sbi, true);
756 return 0;
757
758 out_fail:
759 clear_inode_flag(inode, FI_INC_LINK);
760 f2fs_handle_failed_inode(inode);
761 return err;
762 }
763
f2fs_rmdir(struct inode * dir,struct dentry * dentry)764 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
765 {
766 struct inode *inode = d_inode(dentry);
767 if (f2fs_empty_dir(inode))
768 return f2fs_unlink(dir, dentry);
769 return -ENOTEMPTY;
770 }
771
f2fs_mknod(struct inode * dir,struct dentry * dentry,umode_t mode,dev_t rdev)772 static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
773 umode_t mode, dev_t rdev)
774 {
775 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
776 struct inode *inode;
777 int err = 0;
778
779 if (unlikely(f2fs_cp_error(sbi)))
780 return -EIO;
781 if (!f2fs_is_checkpoint_ready(sbi))
782 return -ENOSPC;
783
784 err = dquot_initialize(dir);
785 if (err)
786 return err;
787
788 inode = f2fs_new_inode(dir, mode);
789 if (IS_ERR(inode))
790 return PTR_ERR(inode);
791
792 init_special_inode(inode, inode->i_mode, rdev);
793 inode->i_op = &f2fs_special_inode_operations;
794
795 f2fs_lock_op(sbi);
796 err = f2fs_add_link(dentry, inode);
797 if (err)
798 goto out;
799 f2fs_unlock_op(sbi);
800
801 f2fs_alloc_nid_done(sbi, inode->i_ino);
802
803 d_instantiate_new(dentry, inode);
804
805 if (IS_DIRSYNC(dir))
806 f2fs_sync_fs(sbi->sb, 1);
807
808 f2fs_balance_fs(sbi, true);
809 return 0;
810 out:
811 f2fs_handle_failed_inode(inode);
812 return err;
813 }
814
__f2fs_tmpfile(struct inode * dir,struct dentry * dentry,umode_t mode,struct inode ** whiteout)815 static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
816 umode_t mode, struct inode **whiteout)
817 {
818 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
819 struct inode *inode;
820 int err;
821
822 err = dquot_initialize(dir);
823 if (err)
824 return err;
825
826 inode = f2fs_new_inode(dir, mode);
827 if (IS_ERR(inode))
828 return PTR_ERR(inode);
829
830 if (whiteout) {
831 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
832 inode->i_op = &f2fs_special_inode_operations;
833 } else {
834 inode->i_op = &f2fs_file_inode_operations;
835 inode->i_fop = &f2fs_file_operations;
836 inode->i_mapping->a_ops = &f2fs_dblock_aops;
837 }
838
839 f2fs_lock_op(sbi);
840 err = f2fs_acquire_orphan_inode(sbi);
841 if (err)
842 goto out;
843
844 err = f2fs_do_tmpfile(inode, dir);
845 if (err)
846 goto release_out;
847
848 /*
849 * add this non-linked tmpfile to orphan list, in this way we could
850 * remove all unused data of tmpfile after abnormal power-off.
851 */
852 f2fs_add_orphan_inode(inode);
853 f2fs_alloc_nid_done(sbi, inode->i_ino);
854
855 if (whiteout) {
856 f2fs_i_links_write(inode, false);
857 inode->i_state |= I_LINKABLE;
858 *whiteout = inode;
859 } else {
860 d_tmpfile(dentry, inode);
861 }
862 /* link_count was changed by d_tmpfile as well. */
863 f2fs_unlock_op(sbi);
864 unlock_new_inode(inode);
865
866 f2fs_balance_fs(sbi, true);
867 return 0;
868
869 release_out:
870 f2fs_release_orphan_inode(sbi);
871 out:
872 f2fs_handle_failed_inode(inode);
873 return err;
874 }
875
f2fs_tmpfile(struct inode * dir,struct dentry * dentry,umode_t mode)876 static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
877 {
878 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
879
880 if (unlikely(f2fs_cp_error(sbi)))
881 return -EIO;
882 if (!f2fs_is_checkpoint_ready(sbi))
883 return -ENOSPC;
884
885 return __f2fs_tmpfile(dir, dentry, mode, NULL);
886 }
887
f2fs_create_whiteout(struct inode * dir,struct inode ** whiteout)888 static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout)
889 {
890 if (unlikely(f2fs_cp_error(F2FS_I_SB(dir))))
891 return -EIO;
892
893 return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout);
894 }
895
f2fs_rename(struct inode * old_dir,struct dentry * old_dentry,struct inode * new_dir,struct dentry * new_dentry,unsigned int flags)896 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
897 struct inode *new_dir, struct dentry *new_dentry,
898 unsigned int flags)
899 {
900 struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
901 struct inode *old_inode = d_inode(old_dentry);
902 struct inode *new_inode = d_inode(new_dentry);
903 struct inode *whiteout = NULL;
904 struct page *old_dir_page = NULL;
905 struct page *old_page, *new_page = NULL;
906 struct f2fs_dir_entry *old_dir_entry = NULL;
907 struct f2fs_dir_entry *old_entry;
908 struct f2fs_dir_entry *new_entry;
909 int err;
910
911 if (unlikely(f2fs_cp_error(sbi)))
912 return -EIO;
913 if (!f2fs_is_checkpoint_ready(sbi))
914 return -ENOSPC;
915
916 if (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
917 (!projid_eq(F2FS_I(new_dir)->i_projid,
918 F2FS_I(old_dentry->d_inode)->i_projid)))
919 return -EXDEV;
920
921 /*
922 * If new_inode is null, the below renaming flow will
923 * add a link in old_dir which can conver inline_dir.
924 * After then, if we failed to get the entry due to other
925 * reasons like ENOMEM, we had to remove the new entry.
926 * Instead of adding such the error handling routine, let's
927 * simply convert first here.
928 */
929 if (old_dir == new_dir && !new_inode) {
930 err = f2fs_try_convert_inline_dir(old_dir, new_dentry);
931 if (err)
932 return err;
933 }
934
935 if (flags & RENAME_WHITEOUT) {
936 err = f2fs_create_whiteout(old_dir, &whiteout);
937 if (err)
938 return err;
939 }
940
941 err = dquot_initialize(old_dir);
942 if (err)
943 goto out;
944
945 err = dquot_initialize(new_dir);
946 if (err)
947 goto out;
948
949 if (new_inode) {
950 err = dquot_initialize(new_inode);
951 if (err)
952 goto out;
953 }
954
955 err = -ENOENT;
956 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
957 if (!old_entry) {
958 if (IS_ERR(old_page))
959 err = PTR_ERR(old_page);
960 goto out;
961 }
962
963 if (S_ISDIR(old_inode->i_mode)) {
964 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
965 if (!old_dir_entry) {
966 if (IS_ERR(old_dir_page))
967 err = PTR_ERR(old_dir_page);
968 goto out_old;
969 }
970 }
971
972 if (new_inode) {
973
974 err = -ENOTEMPTY;
975 if (old_dir_entry && !f2fs_empty_dir(new_inode))
976 goto out_dir;
977
978 err = -ENOENT;
979 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
980 &new_page);
981 if (!new_entry) {
982 if (IS_ERR(new_page))
983 err = PTR_ERR(new_page);
984 goto out_dir;
985 }
986
987 f2fs_balance_fs(sbi, true);
988
989 f2fs_lock_op(sbi);
990
991 err = f2fs_acquire_orphan_inode(sbi);
992 if (err)
993 goto put_out_dir;
994
995 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
996 new_page = NULL;
997
998 new_inode->i_ctime = current_time(new_inode);
999 down_write(&F2FS_I(new_inode)->i_sem);
1000 if (old_dir_entry)
1001 f2fs_i_links_write(new_inode, false);
1002 f2fs_i_links_write(new_inode, false);
1003 up_write(&F2FS_I(new_inode)->i_sem);
1004
1005 if (!new_inode->i_nlink)
1006 f2fs_add_orphan_inode(new_inode);
1007 else
1008 f2fs_release_orphan_inode(sbi);
1009 } else {
1010 f2fs_balance_fs(sbi, true);
1011
1012 f2fs_lock_op(sbi);
1013
1014 err = f2fs_add_link(new_dentry, old_inode);
1015 if (err) {
1016 f2fs_unlock_op(sbi);
1017 goto out_dir;
1018 }
1019
1020 if (old_dir_entry)
1021 f2fs_i_links_write(new_dir, true);
1022 }
1023
1024 down_write(&F2FS_I(old_inode)->i_sem);
1025 if (!old_dir_entry || whiteout)
1026 file_lost_pino(old_inode);
1027 else
1028 /* adjust dir's i_pino to pass fsck check */
1029 f2fs_i_pino_write(old_inode, new_dir->i_ino);
1030 up_write(&F2FS_I(old_inode)->i_sem);
1031
1032 old_inode->i_ctime = current_time(old_inode);
1033 f2fs_mark_inode_dirty_sync(old_inode, false);
1034
1035 f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
1036 old_page = NULL;
1037
1038 if (whiteout) {
1039 set_inode_flag(whiteout, FI_INC_LINK);
1040 err = f2fs_add_link(old_dentry, whiteout);
1041 if (err)
1042 goto put_out_dir;
1043 whiteout->i_state &= ~I_LINKABLE;
1044 iput(whiteout);
1045 }
1046
1047 if (old_dir_entry) {
1048 if (old_dir != new_dir && !whiteout)
1049 f2fs_set_link(old_inode, old_dir_entry,
1050 old_dir_page, new_dir);
1051 else
1052 f2fs_put_page(old_dir_page, 0);
1053 f2fs_i_links_write(old_dir, false);
1054 }
1055 if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) {
1056 f2fs_add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
1057 if (S_ISDIR(old_inode->i_mode))
1058 f2fs_add_ino_entry(sbi, old_inode->i_ino,
1059 TRANS_DIR_INO);
1060 }
1061
1062 f2fs_unlock_op(sbi);
1063
1064 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
1065 f2fs_sync_fs(sbi->sb, 1);
1066
1067 f2fs_update_time(sbi, REQ_TIME);
1068 return 0;
1069
1070 put_out_dir:
1071 f2fs_unlock_op(sbi);
1072 f2fs_put_page(new_page, 0);
1073 out_dir:
1074 if (old_dir_entry)
1075 f2fs_put_page(old_dir_page, 0);
1076 out_old:
1077 f2fs_put_page(old_page, 0);
1078 out:
1079 if (whiteout)
1080 iput(whiteout);
1081 return err;
1082 }
1083
f2fs_cross_rename(struct inode * old_dir,struct dentry * old_dentry,struct inode * new_dir,struct dentry * new_dentry)1084 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
1085 struct inode *new_dir, struct dentry *new_dentry)
1086 {
1087 struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
1088 struct inode *old_inode = d_inode(old_dentry);
1089 struct inode *new_inode = d_inode(new_dentry);
1090 struct page *old_dir_page, *new_dir_page;
1091 struct page *old_page, *new_page;
1092 struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
1093 struct f2fs_dir_entry *old_entry, *new_entry;
1094 int old_nlink = 0, new_nlink = 0;
1095 int err;
1096
1097 if (unlikely(f2fs_cp_error(sbi)))
1098 return -EIO;
1099 if (!f2fs_is_checkpoint_ready(sbi))
1100 return -ENOSPC;
1101
1102 if ((is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1103 !projid_eq(F2FS_I(new_dir)->i_projid,
1104 F2FS_I(old_dentry->d_inode)->i_projid)) ||
1105 (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1106 !projid_eq(F2FS_I(old_dir)->i_projid,
1107 F2FS_I(new_dentry->d_inode)->i_projid)))
1108 return -EXDEV;
1109
1110 err = dquot_initialize(old_dir);
1111 if (err)
1112 goto out;
1113
1114 err = dquot_initialize(new_dir);
1115 if (err)
1116 goto out;
1117
1118 err = -ENOENT;
1119 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
1120 if (!old_entry) {
1121 if (IS_ERR(old_page))
1122 err = PTR_ERR(old_page);
1123 goto out;
1124 }
1125
1126 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
1127 if (!new_entry) {
1128 if (IS_ERR(new_page))
1129 err = PTR_ERR(new_page);
1130 goto out_old;
1131 }
1132
1133 /* prepare for updating ".." directory entry info later */
1134 if (old_dir != new_dir) {
1135 if (S_ISDIR(old_inode->i_mode)) {
1136 old_dir_entry = f2fs_parent_dir(old_inode,
1137 &old_dir_page);
1138 if (!old_dir_entry) {
1139 if (IS_ERR(old_dir_page))
1140 err = PTR_ERR(old_dir_page);
1141 goto out_new;
1142 }
1143 }
1144
1145 if (S_ISDIR(new_inode->i_mode)) {
1146 new_dir_entry = f2fs_parent_dir(new_inode,
1147 &new_dir_page);
1148 if (!new_dir_entry) {
1149 if (IS_ERR(new_dir_page))
1150 err = PTR_ERR(new_dir_page);
1151 goto out_old_dir;
1152 }
1153 }
1154 }
1155
1156 /*
1157 * If cross rename between file and directory those are not
1158 * in the same directory, we will inc nlink of file's parent
1159 * later, so we should check upper boundary of its nlink.
1160 */
1161 if ((!old_dir_entry || !new_dir_entry) &&
1162 old_dir_entry != new_dir_entry) {
1163 old_nlink = old_dir_entry ? -1 : 1;
1164 new_nlink = -old_nlink;
1165 err = -EMLINK;
1166 if ((old_nlink > 0 && old_dir->i_nlink >= F2FS_LINK_MAX) ||
1167 (new_nlink > 0 && new_dir->i_nlink >= F2FS_LINK_MAX))
1168 goto out_new_dir;
1169 }
1170
1171 f2fs_balance_fs(sbi, true);
1172
1173 f2fs_lock_op(sbi);
1174
1175 /* update ".." directory entry info of old dentry */
1176 if (old_dir_entry)
1177 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
1178
1179 /* update ".." directory entry info of new dentry */
1180 if (new_dir_entry)
1181 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
1182
1183 /* update directory entry info of old dir inode */
1184 f2fs_set_link(old_dir, old_entry, old_page, new_inode);
1185
1186 down_write(&F2FS_I(old_inode)->i_sem);
1187 if (!old_dir_entry)
1188 file_lost_pino(old_inode);
1189 else
1190 /* adjust dir's i_pino to pass fsck check */
1191 f2fs_i_pino_write(old_inode, new_dir->i_ino);
1192 up_write(&F2FS_I(old_inode)->i_sem);
1193
1194 old_dir->i_ctime = current_time(old_dir);
1195 if (old_nlink) {
1196 down_write(&F2FS_I(old_dir)->i_sem);
1197 f2fs_i_links_write(old_dir, old_nlink > 0);
1198 up_write(&F2FS_I(old_dir)->i_sem);
1199 }
1200 f2fs_mark_inode_dirty_sync(old_dir, false);
1201
1202 /* update directory entry info of new dir inode */
1203 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
1204
1205 down_write(&F2FS_I(new_inode)->i_sem);
1206 if (!new_dir_entry)
1207 file_lost_pino(new_inode);
1208 else
1209 /* adjust dir's i_pino to pass fsck check */
1210 f2fs_i_pino_write(new_inode, old_dir->i_ino);
1211 up_write(&F2FS_I(new_inode)->i_sem);
1212
1213 new_dir->i_ctime = current_time(new_dir);
1214 if (new_nlink) {
1215 down_write(&F2FS_I(new_dir)->i_sem);
1216 f2fs_i_links_write(new_dir, new_nlink > 0);
1217 up_write(&F2FS_I(new_dir)->i_sem);
1218 }
1219 f2fs_mark_inode_dirty_sync(new_dir, false);
1220
1221 if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) {
1222 f2fs_add_ino_entry(sbi, old_dir->i_ino, TRANS_DIR_INO);
1223 f2fs_add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
1224 }
1225
1226 f2fs_unlock_op(sbi);
1227
1228 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
1229 f2fs_sync_fs(sbi->sb, 1);
1230
1231 f2fs_update_time(sbi, REQ_TIME);
1232 return 0;
1233 out_new_dir:
1234 if (new_dir_entry) {
1235 f2fs_put_page(new_dir_page, 0);
1236 }
1237 out_old_dir:
1238 if (old_dir_entry) {
1239 f2fs_put_page(old_dir_page, 0);
1240 }
1241 out_new:
1242 f2fs_put_page(new_page, 0);
1243 out_old:
1244 f2fs_put_page(old_page, 0);
1245 out:
1246 return err;
1247 }
1248
f2fs_rename2(struct inode * old_dir,struct dentry * old_dentry,struct inode * new_dir,struct dentry * new_dentry,unsigned int flags)1249 static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
1250 struct inode *new_dir, struct dentry *new_dentry,
1251 unsigned int flags)
1252 {
1253 int err;
1254
1255 if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
1256 return -EINVAL;
1257
1258 err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry,
1259 flags);
1260 if (err)
1261 return err;
1262
1263 if (flags & RENAME_EXCHANGE) {
1264 return f2fs_cross_rename(old_dir, old_dentry,
1265 new_dir, new_dentry);
1266 }
1267 /*
1268 * VFS has already handled the new dentry existence case,
1269 * here, we just deal with "RENAME_NOREPLACE" as regular rename.
1270 */
1271 return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
1272 }
1273
f2fs_encrypted_get_link(struct dentry * dentry,struct inode * inode,struct delayed_call * done)1274 static const char *f2fs_encrypted_get_link(struct dentry *dentry,
1275 struct inode *inode,
1276 struct delayed_call *done)
1277 {
1278 struct page *page;
1279 const char *target;
1280
1281 if (!dentry)
1282 return ERR_PTR(-ECHILD);
1283
1284 page = read_mapping_page(inode->i_mapping, 0, NULL);
1285 if (IS_ERR(page))
1286 return ERR_CAST(page);
1287
1288 target = fscrypt_get_symlink(inode, page_address(page),
1289 inode->i_sb->s_blocksize, done);
1290 put_page(page);
1291 return target;
1292 }
1293
1294 const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
1295 .get_link = f2fs_encrypted_get_link,
1296 .getattr = f2fs_getattr,
1297 .setattr = f2fs_setattr,
1298 .listxattr = f2fs_listxattr,
1299 };
1300
1301 const struct inode_operations f2fs_dir_inode_operations = {
1302 .create = f2fs_create,
1303 .lookup = f2fs_lookup,
1304 .link = f2fs_link,
1305 .unlink = f2fs_unlink,
1306 .symlink = f2fs_symlink,
1307 .mkdir = f2fs_mkdir,
1308 .rmdir = f2fs_rmdir,
1309 .mknod = f2fs_mknod,
1310 .rename = f2fs_rename2,
1311 .tmpfile = f2fs_tmpfile,
1312 .getattr = f2fs_getattr,
1313 .setattr = f2fs_setattr,
1314 .get_acl = f2fs_get_acl,
1315 .set_acl = f2fs_set_acl,
1316 .listxattr = f2fs_listxattr,
1317 .fiemap = f2fs_fiemap,
1318 };
1319
1320 const struct inode_operations f2fs_symlink_inode_operations = {
1321 .get_link = f2fs_get_link,
1322 .getattr = f2fs_getattr,
1323 .setattr = f2fs_setattr,
1324 .listxattr = f2fs_listxattr,
1325 };
1326
1327 const struct inode_operations f2fs_special_inode_operations = {
1328 .getattr = f2fs_getattr,
1329 .setattr = f2fs_setattr,
1330 .get_acl = f2fs_get_acl,
1331 .set_acl = f2fs_set_acl,
1332 .listxattr = f2fs_listxattr,
1333 };
1334