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
25static inline bool is_extension_exist(const unsigned char *s, const char *sub,
26 bool tmp_ext, bool tmp_dot)
27{
28 size_t slen = strlen(s);
29 size_t sublen = strlen(sub);
30 int i;
31
32 if (sublen == 1 && *sub == '*')
33 return true;
34
35 /*
36 * filename format of multimedia file should be defined as:
37 * "filename + '.' + extension + (optional: '.' + temp extension)".
38 */
39 if (slen < sublen + 2)
40 return false;
41
42 if (!tmp_ext) {
43 /* file has no temp extension */
44 if (s[slen - sublen - 1] != '.')
45 return false;
46 return !strncasecmp(s1: s + slen - sublen, s2: sub, n: sublen);
47 }
48
49 for (i = 1; i < slen - sublen; i++) {
50 if (s[i] != '.')
51 continue;
52 if (!strncasecmp(s1: s + i + 1, s2: sub, n: sublen)) {
53 if (!tmp_dot)
54 return true;
55 if (i == slen - sublen - 1 || s[i + 1 + sublen] == '.')
56 return true;
57 }
58 }
59
60 return false;
61}
62
63static inline bool is_temperature_extension(const unsigned char *s, const char *sub)
64{
65 return is_extension_exist(s, sub, tmp_ext: true, tmp_dot: false);
66}
67
68static inline bool is_compress_extension(const unsigned char *s, const char *sub)
69{
70 return is_extension_exist(s, sub, tmp_ext: true, tmp_dot: true);
71}
72
73int f2fs_update_extension_list(struct f2fs_sb_info *sbi, const char *name,
74 bool hot, bool set)
75{
76 __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
77 int cold_count = le32_to_cpu(sbi->raw_super->extension_count);
78 int hot_count = sbi->raw_super->hot_ext_count;
79 int total_count = cold_count + hot_count;
80 int start, count;
81 int i;
82
83 if (set) {
84 if (total_count == F2FS_MAX_EXTENSION)
85 return -EINVAL;
86 } else {
87 if (!hot && !cold_count)
88 return -EINVAL;
89 if (hot && !hot_count)
90 return -EINVAL;
91 }
92
93 if (hot) {
94 start = cold_count;
95 count = total_count;
96 } else {
97 start = 0;
98 count = cold_count;
99 }
100
101 for (i = start; i < count; i++) {
102 if (strcmp(name, extlist[i]))
103 continue;
104
105 if (set)
106 return -EINVAL;
107
108 memcpy(extlist[i], extlist[i + 1],
109 F2FS_EXTENSION_LEN * (total_count - i - 1));
110 memset(extlist[total_count - 1], 0, F2FS_EXTENSION_LEN);
111 if (hot)
112 sbi->raw_super->hot_ext_count = hot_count - 1;
113 else
114 sbi->raw_super->extension_count =
115 cpu_to_le32(cold_count - 1);
116 return 0;
117 }
118
119 if (!set)
120 return -EINVAL;
121
122 if (hot) {
123 memcpy(extlist[count], name, strlen(name));
124 sbi->raw_super->hot_ext_count = hot_count + 1;
125 } else {
126 char buf[F2FS_MAX_EXTENSION][F2FS_EXTENSION_LEN];
127
128 memcpy(buf, &extlist[cold_count],
129 F2FS_EXTENSION_LEN * hot_count);
130 memset(extlist[cold_count], 0, F2FS_EXTENSION_LEN);
131 memcpy(extlist[cold_count], name, strlen(name));
132 memcpy(&extlist[cold_count + 1], buf,
133 F2FS_EXTENSION_LEN * hot_count);
134 sbi->raw_super->extension_count = cpu_to_le32(cold_count + 1);
135 }
136 return 0;
137}
138
139static void set_compress_new_inode(struct f2fs_sb_info *sbi, struct inode *dir,
140 struct inode *inode, const unsigned char *name)
141{
142 __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
143 unsigned char (*noext)[F2FS_EXTENSION_LEN] =
144 F2FS_OPTION(sbi).noextensions;
145 unsigned char (*ext)[F2FS_EXTENSION_LEN] = F2FS_OPTION(sbi).extensions;
146 unsigned char ext_cnt = F2FS_OPTION(sbi).compress_ext_cnt;
147 unsigned char noext_cnt = F2FS_OPTION(sbi).nocompress_ext_cnt;
148 int i, cold_count, hot_count;
149
150 if (!f2fs_sb_has_compression(sbi))
151 return;
152
153 if (S_ISDIR(inode->i_mode))
154 goto inherit_comp;
155
156 /* This name comes only from normal files. */
157 if (!name)
158 return;
159
160 /* Don't compress hot files. */
161 f2fs_down_read(sem: &sbi->sb_lock);
162 cold_count = le32_to_cpu(sbi->raw_super->extension_count);
163 hot_count = sbi->raw_super->hot_ext_count;
164 for (i = cold_count; i < cold_count + hot_count; i++)
165 if (is_temperature_extension(s: name, sub: extlist[i]))
166 break;
167 f2fs_up_read(sem: &sbi->sb_lock);
168 if (i < (cold_count + hot_count))
169 return;
170
171 /* Don't compress unallowed extension. */
172 for (i = 0; i < noext_cnt; i++)
173 if (is_compress_extension(s: name, sub: noext[i]))
174 return;
175
176 /* Compress wanting extension. */
177 for (i = 0; i < ext_cnt; i++) {
178 if (is_compress_extension(s: name, sub: ext[i])) {
179 set_compress_context(inode);
180 return;
181 }
182 }
183inherit_comp:
184 /* Inherit the {no-}compression flag in directory */
185 if (F2FS_I(inode: dir)->i_flags & F2FS_NOCOMP_FL) {
186 F2FS_I(inode)->i_flags |= F2FS_NOCOMP_FL;
187 f2fs_mark_inode_dirty_sync(inode, sync: true);
188 } else if (F2FS_I(inode: dir)->i_flags & F2FS_COMPR_FL) {
189 set_compress_context(inode);
190 }
191}
192
193/*
194 * Set file's temperature for hot/cold data separation
195 */
196static void set_file_temperature(struct f2fs_sb_info *sbi, struct inode *inode,
197 const unsigned char *name)
198{
199 __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
200 int i, cold_count, hot_count;
201
202 f2fs_down_read(sem: &sbi->sb_lock);
203 cold_count = le32_to_cpu(sbi->raw_super->extension_count);
204 hot_count = sbi->raw_super->hot_ext_count;
205 for (i = 0; i < cold_count + hot_count; i++)
206 if (is_temperature_extension(s: name, sub: extlist[i]))
207 break;
208 f2fs_up_read(sem: &sbi->sb_lock);
209
210 if (i == cold_count + hot_count)
211 return;
212
213 if (i < cold_count)
214 file_set_cold(inode);
215 else
216 file_set_hot(inode);
217}
218
219static struct inode *f2fs_new_inode(struct mnt_idmap *idmap,
220 struct inode *dir, umode_t mode,
221 const char *name)
222{
223 struct f2fs_sb_info *sbi = F2FS_I_SB(inode: dir);
224 nid_t ino;
225 struct inode *inode;
226 bool nid_free = false;
227 bool encrypt = false;
228 int xattr_size = 0;
229 int err;
230
231 inode = new_inode(sb: dir->i_sb);
232 if (!inode)
233 return ERR_PTR(error: -ENOMEM);
234
235 if (!f2fs_alloc_nid(sbi, nid: &ino)) {
236 err = -ENOSPC;
237 goto fail;
238 }
239
240 nid_free = true;
241
242 inode_init_owner(idmap, inode, dir, mode);
243
244 inode->i_ino = ino;
245 inode->i_blocks = 0;
246 simple_inode_init_ts(inode);
247 F2FS_I(inode)->i_crtime = inode_get_mtime(inode);
248 inode->i_generation = get_random_u32();
249
250 if (S_ISDIR(inode->i_mode))
251 F2FS_I(inode)->i_current_depth = 1;
252
253 err = insert_inode_locked(inode);
254 if (err) {
255 err = -EINVAL;
256 goto fail;
257 }
258
259 if (f2fs_sb_has_project_quota(sbi) &&
260 (F2FS_I(inode: dir)->i_flags & F2FS_PROJINHERIT_FL))
261 F2FS_I(inode)->i_projid = F2FS_I(inode: dir)->i_projid;
262 else
263 F2FS_I(inode)->i_projid = make_kprojid(from: &init_user_ns,
264 F2FS_DEF_PROJID);
265
266 err = fscrypt_prepare_new_inode(dir, inode, encrypt_ret: &encrypt);
267 if (err)
268 goto fail_drop;
269
270 err = f2fs_dquot_initialize(inode);
271 if (err)
272 goto fail_drop;
273
274 set_inode_flag(inode, flag: FI_NEW_INODE);
275
276 if (encrypt)
277 f2fs_set_encrypted_inode(inode);
278
279 if (f2fs_sb_has_extra_attr(sbi)) {
280 set_inode_flag(inode, flag: FI_EXTRA_ATTR);
281 F2FS_I(inode)->i_extra_isize = F2FS_TOTAL_EXTRA_ATTR_SIZE;
282 }
283
284 if (test_opt(sbi, INLINE_XATTR))
285 set_inode_flag(inode, flag: FI_INLINE_XATTR);
286
287 if (f2fs_may_inline_dentry(inode))
288 set_inode_flag(inode, flag: FI_INLINE_DENTRY);
289
290 if (f2fs_sb_has_flexible_inline_xattr(sbi)) {
291 f2fs_bug_on(sbi, !f2fs_has_extra_attr(inode));
292 if (f2fs_has_inline_xattr(inode))
293 xattr_size = F2FS_OPTION(sbi).inline_xattr_size;
294 /* Otherwise, will be 0 */
295 } else if (f2fs_has_inline_xattr(inode) ||
296 f2fs_has_inline_dentry(inode)) {
297 xattr_size = DEFAULT_INLINE_XATTR_ADDRS;
298 }
299 F2FS_I(inode)->i_inline_xattr_size = xattr_size;
300
301 F2FS_I(inode)->i_flags =
302 f2fs_mask_flags(mode, flags: F2FS_I(inode: dir)->i_flags & F2FS_FL_INHERITED);
303
304 if (S_ISDIR(inode->i_mode))
305 F2FS_I(inode)->i_flags |= F2FS_INDEX_FL;
306
307 if (F2FS_I(inode)->i_flags & F2FS_PROJINHERIT_FL)
308 set_inode_flag(inode, flag: FI_PROJ_INHERIT);
309
310 /* Check compression first. */
311 set_compress_new_inode(sbi, dir, inode, name);
312
313 /* Should enable inline_data after compression set */
314 if (test_opt(sbi, INLINE_DATA) && f2fs_may_inline_data(inode))
315 set_inode_flag(inode, flag: FI_INLINE_DATA);
316
317 if (name && !test_opt(sbi, DISABLE_EXT_IDENTIFY))
318 set_file_temperature(sbi, inode, name);
319
320 stat_inc_inline_xattr(inode);
321 stat_inc_inline_inode(inode);
322 stat_inc_inline_dir(inode);
323
324 f2fs_set_inode_flags(inode);
325
326 f2fs_init_extent_tree(inode);
327
328 trace_f2fs_new_inode(inode, ret: 0);
329 return inode;
330
331fail:
332 trace_f2fs_new_inode(inode, ret: err);
333 make_bad_inode(inode);
334 if (nid_free)
335 set_inode_flag(inode, flag: FI_FREE_NID);
336 iput(inode);
337 return ERR_PTR(error: err);
338fail_drop:
339 trace_f2fs_new_inode(inode, ret: err);
340 dquot_drop(inode);
341 inode->i_flags |= S_NOQUOTA;
342 if (nid_free)
343 set_inode_flag(inode, flag: FI_FREE_NID);
344 clear_nlink(inode);
345 unlock_new_inode(inode);
346 iput(inode);
347 return ERR_PTR(error: err);
348}
349
350static int f2fs_create(struct mnt_idmap *idmap, struct inode *dir,
351 struct dentry *dentry, umode_t mode, bool excl)
352{
353 struct f2fs_sb_info *sbi = F2FS_I_SB(inode: dir);
354 struct inode *inode;
355 nid_t ino = 0;
356 int err;
357
358 if (unlikely(f2fs_cp_error(sbi)))
359 return -EIO;
360 if (!f2fs_is_checkpoint_ready(sbi))
361 return -ENOSPC;
362
363 err = f2fs_dquot_initialize(inode: dir);
364 if (err)
365 return err;
366
367 inode = f2fs_new_inode(idmap, dir, mode, name: dentry->d_name.name);
368 if (IS_ERR(ptr: inode))
369 return PTR_ERR(ptr: inode);
370
371 inode->i_op = &f2fs_file_inode_operations;
372 inode->i_fop = &f2fs_file_operations;
373 inode->i_mapping->a_ops = &f2fs_dblock_aops;
374 ino = inode->i_ino;
375
376 f2fs_lock_op(sbi);
377 err = f2fs_add_link(dentry, inode);
378 if (err)
379 goto out;
380 f2fs_unlock_op(sbi);
381
382 f2fs_alloc_nid_done(sbi, nid: ino);
383
384 d_instantiate_new(dentry, inode);
385
386 if (IS_DIRSYNC(dir))
387 f2fs_sync_fs(sb: sbi->sb, sync: 1);
388
389 f2fs_balance_fs(sbi, need: true);
390 return 0;
391out:
392 f2fs_handle_failed_inode(inode);
393 return err;
394}
395
396static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
397 struct dentry *dentry)
398{
399 struct inode *inode = d_inode(dentry: old_dentry);
400 struct f2fs_sb_info *sbi = F2FS_I_SB(inode: dir);
401 int err;
402
403 if (unlikely(f2fs_cp_error(sbi)))
404 return -EIO;
405 if (!f2fs_is_checkpoint_ready(sbi))
406 return -ENOSPC;
407
408 err = fscrypt_prepare_link(old_dentry, dir, dentry);
409 if (err)
410 return err;
411
412 if (is_inode_flag_set(inode: dir, flag: FI_PROJ_INHERIT) &&
413 (!projid_eq(left: F2FS_I(inode: dir)->i_projid,
414 right: F2FS_I(inode: old_dentry->d_inode)->i_projid)))
415 return -EXDEV;
416
417 err = f2fs_dquot_initialize(inode: dir);
418 if (err)
419 return err;
420
421 f2fs_balance_fs(sbi, need: true);
422
423 inode_set_ctime_current(inode);
424 ihold(inode);
425
426 set_inode_flag(inode, flag: FI_INC_LINK);
427 f2fs_lock_op(sbi);
428 err = f2fs_add_link(dentry, inode);
429 if (err)
430 goto out;
431 f2fs_unlock_op(sbi);
432
433 d_instantiate(dentry, inode);
434
435 if (IS_DIRSYNC(dir))
436 f2fs_sync_fs(sb: sbi->sb, sync: 1);
437 return 0;
438out:
439 clear_inode_flag(inode, flag: FI_INC_LINK);
440 iput(inode);
441 f2fs_unlock_op(sbi);
442 return err;
443}
444
445struct dentry *f2fs_get_parent(struct dentry *child)
446{
447 struct page *page;
448 unsigned long ino = f2fs_inode_by_name(dir: d_inode(dentry: child), qstr: &dotdot_name, page: &page);
449
450 if (!ino) {
451 if (IS_ERR(ptr: page))
452 return ERR_CAST(ptr: page);
453 return ERR_PTR(error: -ENOENT);
454 }
455 return d_obtain_alias(f2fs_iget(sb: child->d_sb, ino));
456}
457
458static int __recover_dot_dentries(struct inode *dir, nid_t pino)
459{
460 struct f2fs_sb_info *sbi = F2FS_I_SB(inode: dir);
461 struct qstr dot = QSTR_INIT(".", 1);
462 struct qstr dotdot = QSTR_INIT("..", 2);
463 struct f2fs_dir_entry *de;
464 struct page *page;
465 int err = 0;
466
467 if (f2fs_readonly(sb: sbi->sb)) {
468 f2fs_info(sbi, "skip recovering inline_dots inode (ino:%lu, pino:%u) in readonly mountpoint",
469 dir->i_ino, pino);
470 return 0;
471 }
472
473 if (!S_ISDIR(dir->i_mode)) {
474 f2fs_err(sbi, "inconsistent inode status, skip recovering inline_dots inode (ino:%lu, i_mode:%u, pino:%u)",
475 dir->i_ino, dir->i_mode, pino);
476 set_sbi_flag(sbi, type: SBI_NEED_FSCK);
477 return -ENOTDIR;
478 }
479
480 err = f2fs_dquot_initialize(inode: dir);
481 if (err)
482 return err;
483
484 f2fs_balance_fs(sbi, need: true);
485
486 f2fs_lock_op(sbi);
487
488 de = f2fs_find_entry(dir, child: &dot, res_page: &page);
489 if (de) {
490 f2fs_put_page(page, unlock: 0);
491 } else if (IS_ERR(ptr: page)) {
492 err = PTR_ERR(ptr: page);
493 goto out;
494 } else {
495 err = f2fs_do_add_link(dir, name: &dot, NULL, ino: dir->i_ino, S_IFDIR);
496 if (err)
497 goto out;
498 }
499
500 de = f2fs_find_entry(dir, child: &dotdot, res_page: &page);
501 if (de)
502 f2fs_put_page(page, unlock: 0);
503 else if (IS_ERR(ptr: page))
504 err = PTR_ERR(ptr: page);
505 else
506 err = f2fs_do_add_link(dir, name: &dotdot, NULL, ino: pino, S_IFDIR);
507out:
508 if (!err)
509 clear_inode_flag(inode: dir, flag: FI_INLINE_DOTS);
510
511 f2fs_unlock_op(sbi);
512 return err;
513}
514
515static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
516 unsigned int flags)
517{
518 struct inode *inode = NULL;
519 struct f2fs_dir_entry *de;
520 struct page *page;
521 struct dentry *new;
522 nid_t ino = -1;
523 int err = 0;
524 unsigned int root_ino = F2FS_ROOT_INO(F2FS_I_SB(dir));
525 struct f2fs_filename fname;
526
527 trace_f2fs_lookup_start(dir, dentry, flags);
528
529 if (dentry->d_name.len > F2FS_NAME_LEN) {
530 err = -ENAMETOOLONG;
531 goto out;
532 }
533
534 err = f2fs_prepare_lookup(dir, dentry, fname: &fname);
535 generic_set_encrypted_ci_d_ops(dentry);
536 if (err == -ENOENT)
537 goto out_splice;
538 if (err)
539 goto out;
540 de = __f2fs_find_entry(dir, fname: &fname, res_page: &page);
541 f2fs_free_filename(fname: &fname);
542
543 if (!de) {
544 if (IS_ERR(ptr: page)) {
545 err = PTR_ERR(ptr: page);
546 goto out;
547 }
548 err = -ENOENT;
549 goto out_splice;
550 }
551
552 ino = le32_to_cpu(de->ino);
553 f2fs_put_page(page, unlock: 0);
554
555 inode = f2fs_iget(sb: dir->i_sb, ino);
556 if (IS_ERR(ptr: inode)) {
557 err = PTR_ERR(ptr: inode);
558 goto out;
559 }
560
561 if ((dir->i_ino == root_ino) && f2fs_has_inline_dots(inode: dir)) {
562 err = __recover_dot_dentries(dir, pino: root_ino);
563 if (err)
564 goto out_iput;
565 }
566
567 if (f2fs_has_inline_dots(inode)) {
568 err = __recover_dot_dentries(dir: inode, pino: dir->i_ino);
569 if (err)
570 goto out_iput;
571 }
572 if (IS_ENCRYPTED(dir) &&
573 (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
574 !fscrypt_has_permitted_context(parent: dir, child: inode)) {
575 f2fs_warn(F2FS_I_SB(inode), "Inconsistent encryption contexts: %lu/%lu",
576 dir->i_ino, inode->i_ino);
577 err = -EPERM;
578 goto out_iput;
579 }
580out_splice:
581#if IS_ENABLED(CONFIG_UNICODE)
582 if (!inode && IS_CASEFOLDED(dir)) {
583 /* Eventually we want to call d_add_ci(dentry, NULL)
584 * for negative dentries in the encoding case as
585 * well. For now, prevent the negative dentry
586 * from being cached.
587 */
588 trace_f2fs_lookup_end(dir, dentry, ino, err);
589 return NULL;
590 }
591#endif
592 new = d_splice_alias(inode, dentry);
593 trace_f2fs_lookup_end(dir, dentry: !IS_ERR_OR_NULL(ptr: new) ? new : dentry,
594 ino, err: IS_ERR(ptr: new) ? PTR_ERR(ptr: new) : err);
595 return new;
596out_iput:
597 iput(inode);
598out:
599 trace_f2fs_lookup_end(dir, dentry, ino, err);
600 return ERR_PTR(error: err);
601}
602
603static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
604{
605 struct f2fs_sb_info *sbi = F2FS_I_SB(inode: dir);
606 struct inode *inode = d_inode(dentry);
607 struct f2fs_dir_entry *de;
608 struct page *page;
609 int err;
610
611 trace_f2fs_unlink_enter(dir, dentry);
612
613 if (unlikely(f2fs_cp_error(sbi))) {
614 err = -EIO;
615 goto fail;
616 }
617
618 err = f2fs_dquot_initialize(inode: dir);
619 if (err)
620 goto fail;
621 err = f2fs_dquot_initialize(inode);
622 if (err)
623 goto fail;
624
625 de = f2fs_find_entry(dir, child: &dentry->d_name, res_page: &page);
626 if (!de) {
627 if (IS_ERR(ptr: page))
628 err = PTR_ERR(ptr: page);
629 goto fail;
630 }
631
632 f2fs_balance_fs(sbi, need: true);
633
634 f2fs_lock_op(sbi);
635 err = f2fs_acquire_orphan_inode(sbi);
636 if (err) {
637 f2fs_unlock_op(sbi);
638 f2fs_put_page(page, unlock: 0);
639 goto fail;
640 }
641 f2fs_delete_entry(dentry: de, page, dir, inode);
642 f2fs_unlock_op(sbi);
643
644#if IS_ENABLED(CONFIG_UNICODE)
645 /* VFS negative dentries are incompatible with Encoding and
646 * Case-insensitiveness. Eventually we'll want avoid
647 * invalidating the dentries here, alongside with returning the
648 * negative dentries at f2fs_lookup(), when it is better
649 * supported by the VFS for the CI case.
650 */
651 if (IS_CASEFOLDED(dir))
652 d_invalidate(dentry);
653#endif
654 if (IS_DIRSYNC(dir))
655 f2fs_sync_fs(sb: sbi->sb, sync: 1);
656fail:
657 trace_f2fs_unlink_exit(inode, ret: err);
658 return err;
659}
660
661static const char *f2fs_get_link(struct dentry *dentry,
662 struct inode *inode,
663 struct delayed_call *done)
664{
665 const char *link = page_get_link(dentry, inode, done);
666
667 if (!IS_ERR(ptr: link) && !*link) {
668 /* this is broken symlink case */
669 do_delayed_call(call: done);
670 clear_delayed_call(call: done);
671 link = ERR_PTR(error: -ENOENT);
672 }
673 return link;
674}
675
676static int f2fs_symlink(struct mnt_idmap *idmap, struct inode *dir,
677 struct dentry *dentry, const char *symname)
678{
679 struct f2fs_sb_info *sbi = F2FS_I_SB(inode: dir);
680 struct inode *inode;
681 size_t len = strlen(symname);
682 struct fscrypt_str disk_link;
683 int err;
684
685 if (unlikely(f2fs_cp_error(sbi)))
686 return -EIO;
687 if (!f2fs_is_checkpoint_ready(sbi))
688 return -ENOSPC;
689
690 err = fscrypt_prepare_symlink(dir, target: symname, len, max_len: dir->i_sb->s_blocksize,
691 disk_link: &disk_link);
692 if (err)
693 return err;
694
695 err = f2fs_dquot_initialize(inode: dir);
696 if (err)
697 return err;
698
699 inode = f2fs_new_inode(idmap, dir, S_IFLNK | S_IRWXUGO, NULL);
700 if (IS_ERR(ptr: inode))
701 return PTR_ERR(ptr: inode);
702
703 if (IS_ENCRYPTED(inode))
704 inode->i_op = &f2fs_encrypted_symlink_inode_operations;
705 else
706 inode->i_op = &f2fs_symlink_inode_operations;
707 inode_nohighmem(inode);
708 inode->i_mapping->a_ops = &f2fs_dblock_aops;
709
710 f2fs_lock_op(sbi);
711 err = f2fs_add_link(dentry, inode);
712 if (err)
713 goto out_f2fs_handle_failed_inode;
714 f2fs_unlock_op(sbi);
715 f2fs_alloc_nid_done(sbi, nid: inode->i_ino);
716
717 err = fscrypt_encrypt_symlink(inode, target: symname, len, disk_link: &disk_link);
718 if (err)
719 goto err_out;
720
721 err = page_symlink(inode, symname: disk_link.name, len: disk_link.len);
722
723err_out:
724 d_instantiate_new(dentry, inode);
725
726 /*
727 * Let's flush symlink data in order to avoid broken symlink as much as
728 * possible. Nevertheless, fsyncing is the best way, but there is no
729 * way to get a file descriptor in order to flush that.
730 *
731 * Note that, it needs to do dir->fsync to make this recoverable.
732 * If the symlink path is stored into inline_data, there is no
733 * performance regression.
734 */
735 if (!err) {
736 filemap_write_and_wait_range(mapping: inode->i_mapping, lstart: 0,
737 lend: disk_link.len - 1);
738
739 if (IS_DIRSYNC(dir))
740 f2fs_sync_fs(sb: sbi->sb, sync: 1);
741 } else {
742 f2fs_unlink(dir, dentry);
743 }
744
745 f2fs_balance_fs(sbi, need: true);
746 goto out_free_encrypted_link;
747
748out_f2fs_handle_failed_inode:
749 f2fs_handle_failed_inode(inode);
750out_free_encrypted_link:
751 if (disk_link.name != (unsigned char *)symname)
752 kfree(objp: disk_link.name);
753 return err;
754}
755
756static int f2fs_mkdir(struct mnt_idmap *idmap, struct inode *dir,
757 struct dentry *dentry, umode_t mode)
758{
759 struct f2fs_sb_info *sbi = F2FS_I_SB(inode: dir);
760 struct inode *inode;
761 int err;
762
763 if (unlikely(f2fs_cp_error(sbi)))
764 return -EIO;
765
766 err = f2fs_dquot_initialize(inode: dir);
767 if (err)
768 return err;
769
770 inode = f2fs_new_inode(idmap, dir, S_IFDIR | mode, NULL);
771 if (IS_ERR(ptr: inode))
772 return PTR_ERR(ptr: inode);
773
774 inode->i_op = &f2fs_dir_inode_operations;
775 inode->i_fop = &f2fs_dir_operations;
776 inode->i_mapping->a_ops = &f2fs_dblock_aops;
777 mapping_set_gfp_mask(m: inode->i_mapping, GFP_NOFS);
778
779 set_inode_flag(inode, flag: FI_INC_LINK);
780 f2fs_lock_op(sbi);
781 err = f2fs_add_link(dentry, inode);
782 if (err)
783 goto out_fail;
784 f2fs_unlock_op(sbi);
785
786 f2fs_alloc_nid_done(sbi, nid: inode->i_ino);
787
788 d_instantiate_new(dentry, inode);
789
790 if (IS_DIRSYNC(dir))
791 f2fs_sync_fs(sb: sbi->sb, sync: 1);
792
793 f2fs_balance_fs(sbi, need: true);
794 return 0;
795
796out_fail:
797 clear_inode_flag(inode, flag: FI_INC_LINK);
798 f2fs_handle_failed_inode(inode);
799 return err;
800}
801
802static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
803{
804 struct inode *inode = d_inode(dentry);
805
806 if (f2fs_empty_dir(dir: inode))
807 return f2fs_unlink(dir, dentry);
808 return -ENOTEMPTY;
809}
810
811static int f2fs_mknod(struct mnt_idmap *idmap, struct inode *dir,
812 struct dentry *dentry, umode_t mode, dev_t rdev)
813{
814 struct f2fs_sb_info *sbi = F2FS_I_SB(inode: dir);
815 struct inode *inode;
816 int err = 0;
817
818 if (unlikely(f2fs_cp_error(sbi)))
819 return -EIO;
820 if (!f2fs_is_checkpoint_ready(sbi))
821 return -ENOSPC;
822
823 err = f2fs_dquot_initialize(inode: dir);
824 if (err)
825 return err;
826
827 inode = f2fs_new_inode(idmap, dir, mode, NULL);
828 if (IS_ERR(ptr: inode))
829 return PTR_ERR(ptr: inode);
830
831 init_special_inode(inode, inode->i_mode, rdev);
832 inode->i_op = &f2fs_special_inode_operations;
833
834 f2fs_lock_op(sbi);
835 err = f2fs_add_link(dentry, inode);
836 if (err)
837 goto out;
838 f2fs_unlock_op(sbi);
839
840 f2fs_alloc_nid_done(sbi, nid: inode->i_ino);
841
842 d_instantiate_new(dentry, inode);
843
844 if (IS_DIRSYNC(dir))
845 f2fs_sync_fs(sb: sbi->sb, sync: 1);
846
847 f2fs_balance_fs(sbi, need: true);
848 return 0;
849out:
850 f2fs_handle_failed_inode(inode);
851 return err;
852}
853
854static int __f2fs_tmpfile(struct mnt_idmap *idmap, struct inode *dir,
855 struct file *file, umode_t mode, bool is_whiteout,
856 struct inode **new_inode)
857{
858 struct f2fs_sb_info *sbi = F2FS_I_SB(inode: dir);
859 struct inode *inode;
860 int err;
861
862 err = f2fs_dquot_initialize(inode: dir);
863 if (err)
864 return err;
865
866 inode = f2fs_new_inode(idmap, dir, mode, NULL);
867 if (IS_ERR(ptr: inode))
868 return PTR_ERR(ptr: inode);
869
870 if (is_whiteout) {
871 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
872 inode->i_op = &f2fs_special_inode_operations;
873 } else {
874 inode->i_op = &f2fs_file_inode_operations;
875 inode->i_fop = &f2fs_file_operations;
876 inode->i_mapping->a_ops = &f2fs_dblock_aops;
877 }
878
879 f2fs_lock_op(sbi);
880 err = f2fs_acquire_orphan_inode(sbi);
881 if (err)
882 goto out;
883
884 err = f2fs_do_tmpfile(inode, dir);
885 if (err)
886 goto release_out;
887
888 /*
889 * add this non-linked tmpfile to orphan list, in this way we could
890 * remove all unused data of tmpfile after abnormal power-off.
891 */
892 f2fs_add_orphan_inode(inode);
893 f2fs_alloc_nid_done(sbi, nid: inode->i_ino);
894
895 if (is_whiteout) {
896 f2fs_i_links_write(inode, inc: false);
897
898 spin_lock(lock: &inode->i_lock);
899 inode->i_state |= I_LINKABLE;
900 spin_unlock(lock: &inode->i_lock);
901 } else {
902 if (file)
903 d_tmpfile(file, inode);
904 else
905 f2fs_i_links_write(inode, inc: false);
906 }
907 /* link_count was changed by d_tmpfile as well. */
908 f2fs_unlock_op(sbi);
909 unlock_new_inode(inode);
910
911 if (new_inode)
912 *new_inode = inode;
913
914 f2fs_balance_fs(sbi, need: true);
915 return 0;
916
917release_out:
918 f2fs_release_orphan_inode(sbi);
919out:
920 f2fs_handle_failed_inode(inode);
921 return err;
922}
923
924static int f2fs_tmpfile(struct mnt_idmap *idmap, struct inode *dir,
925 struct file *file, umode_t mode)
926{
927 struct f2fs_sb_info *sbi = F2FS_I_SB(inode: dir);
928 int err;
929
930 if (unlikely(f2fs_cp_error(sbi)))
931 return -EIO;
932 if (!f2fs_is_checkpoint_ready(sbi))
933 return -ENOSPC;
934
935 err = __f2fs_tmpfile(idmap, dir, file, mode, is_whiteout: false, NULL);
936
937 return finish_open_simple(file, error: err);
938}
939
940static int f2fs_create_whiteout(struct mnt_idmap *idmap,
941 struct inode *dir, struct inode **whiteout)
942{
943 return __f2fs_tmpfile(idmap, dir, NULL,
944 S_IFCHR | WHITEOUT_MODE, is_whiteout: true, new_inode: whiteout);
945}
946
947int f2fs_get_tmpfile(struct mnt_idmap *idmap, struct inode *dir,
948 struct inode **new_inode)
949{
950 return __f2fs_tmpfile(idmap, dir, NULL, S_IFREG, is_whiteout: false, new_inode);
951}
952
953static int f2fs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
954 struct dentry *old_dentry, struct inode *new_dir,
955 struct dentry *new_dentry, unsigned int flags)
956{
957 struct f2fs_sb_info *sbi = F2FS_I_SB(inode: old_dir);
958 struct inode *old_inode = d_inode(dentry: old_dentry);
959 struct inode *new_inode = d_inode(dentry: new_dentry);
960 struct inode *whiteout = NULL;
961 struct page *old_dir_page = NULL;
962 struct page *old_page, *new_page = NULL;
963 struct f2fs_dir_entry *old_dir_entry = NULL;
964 struct f2fs_dir_entry *old_entry;
965 struct f2fs_dir_entry *new_entry;
966 int err;
967
968 if (unlikely(f2fs_cp_error(sbi)))
969 return -EIO;
970 if (!f2fs_is_checkpoint_ready(sbi))
971 return -ENOSPC;
972
973 if (is_inode_flag_set(inode: new_dir, flag: FI_PROJ_INHERIT) &&
974 (!projid_eq(left: F2FS_I(inode: new_dir)->i_projid,
975 right: F2FS_I(inode: old_dentry->d_inode)->i_projid)))
976 return -EXDEV;
977
978 /*
979 * If new_inode is null, the below renaming flow will
980 * add a link in old_dir which can convert inline_dir.
981 * After then, if we failed to get the entry due to other
982 * reasons like ENOMEM, we had to remove the new entry.
983 * Instead of adding such the error handling routine, let's
984 * simply convert first here.
985 */
986 if (old_dir == new_dir && !new_inode) {
987 err = f2fs_try_convert_inline_dir(dir: old_dir, dentry: new_dentry);
988 if (err)
989 return err;
990 }
991
992 if (flags & RENAME_WHITEOUT) {
993 err = f2fs_create_whiteout(idmap, dir: old_dir, whiteout: &whiteout);
994 if (err)
995 return err;
996 }
997
998 err = f2fs_dquot_initialize(inode: old_dir);
999 if (err)
1000 goto out;
1001
1002 err = f2fs_dquot_initialize(inode: new_dir);
1003 if (err)
1004 goto out;
1005
1006 if (new_inode) {
1007 err = f2fs_dquot_initialize(inode: new_inode);
1008 if (err)
1009 goto out;
1010 }
1011
1012 err = -ENOENT;
1013 old_entry = f2fs_find_entry(dir: old_dir, child: &old_dentry->d_name, res_page: &old_page);
1014 if (!old_entry) {
1015 if (IS_ERR(ptr: old_page))
1016 err = PTR_ERR(ptr: old_page);
1017 goto out;
1018 }
1019
1020 if (S_ISDIR(old_inode->i_mode)) {
1021 old_dir_entry = f2fs_parent_dir(dir: old_inode, p: &old_dir_page);
1022 if (!old_dir_entry) {
1023 if (IS_ERR(ptr: old_dir_page))
1024 err = PTR_ERR(ptr: old_dir_page);
1025 goto out_old;
1026 }
1027 }
1028
1029 if (new_inode) {
1030
1031 err = -ENOTEMPTY;
1032 if (old_dir_entry && !f2fs_empty_dir(dir: new_inode))
1033 goto out_dir;
1034
1035 err = -ENOENT;
1036 new_entry = f2fs_find_entry(dir: new_dir, child: &new_dentry->d_name,
1037 res_page: &new_page);
1038 if (!new_entry) {
1039 if (IS_ERR(ptr: new_page))
1040 err = PTR_ERR(ptr: new_page);
1041 goto out_dir;
1042 }
1043
1044 f2fs_balance_fs(sbi, need: true);
1045
1046 f2fs_lock_op(sbi);
1047
1048 err = f2fs_acquire_orphan_inode(sbi);
1049 if (err)
1050 goto put_out_dir;
1051
1052 f2fs_set_link(dir: new_dir, de: new_entry, page: new_page, inode: old_inode);
1053 new_page = NULL;
1054
1055 inode_set_ctime_current(inode: new_inode);
1056 f2fs_down_write(sem: &F2FS_I(inode: new_inode)->i_sem);
1057 if (old_dir_entry)
1058 f2fs_i_links_write(inode: new_inode, inc: false);
1059 f2fs_i_links_write(inode: new_inode, inc: false);
1060 f2fs_up_write(sem: &F2FS_I(inode: new_inode)->i_sem);
1061
1062 if (!new_inode->i_nlink)
1063 f2fs_add_orphan_inode(inode: new_inode);
1064 else
1065 f2fs_release_orphan_inode(sbi);
1066 } else {
1067 f2fs_balance_fs(sbi, need: true);
1068
1069 f2fs_lock_op(sbi);
1070
1071 err = f2fs_add_link(dentry: new_dentry, inode: old_inode);
1072 if (err) {
1073 f2fs_unlock_op(sbi);
1074 goto out_dir;
1075 }
1076
1077 if (old_dir_entry)
1078 f2fs_i_links_write(inode: new_dir, inc: true);
1079 }
1080
1081 f2fs_down_write(sem: &F2FS_I(inode: old_inode)->i_sem);
1082 if (!old_dir_entry || whiteout)
1083 file_lost_pino(old_inode);
1084 else
1085 /* adjust dir's i_pino to pass fsck check */
1086 f2fs_i_pino_write(inode: old_inode, pino: new_dir->i_ino);
1087 f2fs_up_write(sem: &F2FS_I(inode: old_inode)->i_sem);
1088
1089 inode_set_ctime_current(inode: old_inode);
1090 f2fs_mark_inode_dirty_sync(inode: old_inode, sync: false);
1091
1092 f2fs_delete_entry(dentry: old_entry, page: old_page, dir: old_dir, NULL);
1093 old_page = NULL;
1094
1095 if (whiteout) {
1096 set_inode_flag(inode: whiteout, flag: FI_INC_LINK);
1097 err = f2fs_add_link(dentry: old_dentry, inode: whiteout);
1098 if (err)
1099 goto put_out_dir;
1100
1101 spin_lock(lock: &whiteout->i_lock);
1102 whiteout->i_state &= ~I_LINKABLE;
1103 spin_unlock(lock: &whiteout->i_lock);
1104
1105 iput(whiteout);
1106 }
1107
1108 if (old_dir_entry) {
1109 if (old_dir != new_dir && !whiteout)
1110 f2fs_set_link(dir: old_inode, de: old_dir_entry,
1111 page: old_dir_page, inode: new_dir);
1112 else
1113 f2fs_put_page(page: old_dir_page, unlock: 0);
1114 f2fs_i_links_write(inode: old_dir, inc: false);
1115 }
1116 if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) {
1117 f2fs_add_ino_entry(sbi, ino: new_dir->i_ino, type: TRANS_DIR_INO);
1118 if (S_ISDIR(old_inode->i_mode))
1119 f2fs_add_ino_entry(sbi, ino: old_inode->i_ino,
1120 type: TRANS_DIR_INO);
1121 }
1122
1123 f2fs_unlock_op(sbi);
1124
1125 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
1126 f2fs_sync_fs(sb: sbi->sb, sync: 1);
1127
1128 f2fs_update_time(sbi, type: REQ_TIME);
1129 return 0;
1130
1131put_out_dir:
1132 f2fs_unlock_op(sbi);
1133 f2fs_put_page(page: new_page, unlock: 0);
1134out_dir:
1135 if (old_dir_entry)
1136 f2fs_put_page(page: old_dir_page, unlock: 0);
1137out_old:
1138 f2fs_put_page(page: old_page, unlock: 0);
1139out:
1140 iput(whiteout);
1141 return err;
1142}
1143
1144static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
1145 struct inode *new_dir, struct dentry *new_dentry)
1146{
1147 struct f2fs_sb_info *sbi = F2FS_I_SB(inode: old_dir);
1148 struct inode *old_inode = d_inode(dentry: old_dentry);
1149 struct inode *new_inode = d_inode(dentry: new_dentry);
1150 struct page *old_dir_page, *new_dir_page;
1151 struct page *old_page, *new_page;
1152 struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
1153 struct f2fs_dir_entry *old_entry, *new_entry;
1154 int old_nlink = 0, new_nlink = 0;
1155 int err;
1156
1157 if (unlikely(f2fs_cp_error(sbi)))
1158 return -EIO;
1159 if (!f2fs_is_checkpoint_ready(sbi))
1160 return -ENOSPC;
1161
1162 if ((is_inode_flag_set(inode: new_dir, flag: FI_PROJ_INHERIT) &&
1163 !projid_eq(left: F2FS_I(inode: new_dir)->i_projid,
1164 right: F2FS_I(inode: old_dentry->d_inode)->i_projid)) ||
1165 (is_inode_flag_set(inode: new_dir, flag: FI_PROJ_INHERIT) &&
1166 !projid_eq(left: F2FS_I(inode: old_dir)->i_projid,
1167 right: F2FS_I(inode: new_dentry->d_inode)->i_projid)))
1168 return -EXDEV;
1169
1170 err = f2fs_dquot_initialize(inode: old_dir);
1171 if (err)
1172 goto out;
1173
1174 err = f2fs_dquot_initialize(inode: new_dir);
1175 if (err)
1176 goto out;
1177
1178 err = -ENOENT;
1179 old_entry = f2fs_find_entry(dir: old_dir, child: &old_dentry->d_name, res_page: &old_page);
1180 if (!old_entry) {
1181 if (IS_ERR(ptr: old_page))
1182 err = PTR_ERR(ptr: old_page);
1183 goto out;
1184 }
1185
1186 new_entry = f2fs_find_entry(dir: new_dir, child: &new_dentry->d_name, res_page: &new_page);
1187 if (!new_entry) {
1188 if (IS_ERR(ptr: new_page))
1189 err = PTR_ERR(ptr: new_page);
1190 goto out_old;
1191 }
1192
1193 /* prepare for updating ".." directory entry info later */
1194 if (old_dir != new_dir) {
1195 if (S_ISDIR(old_inode->i_mode)) {
1196 old_dir_entry = f2fs_parent_dir(dir: old_inode,
1197 p: &old_dir_page);
1198 if (!old_dir_entry) {
1199 if (IS_ERR(ptr: old_dir_page))
1200 err = PTR_ERR(ptr: old_dir_page);
1201 goto out_new;
1202 }
1203 }
1204
1205 if (S_ISDIR(new_inode->i_mode)) {
1206 new_dir_entry = f2fs_parent_dir(dir: new_inode,
1207 p: &new_dir_page);
1208 if (!new_dir_entry) {
1209 if (IS_ERR(ptr: new_dir_page))
1210 err = PTR_ERR(ptr: new_dir_page);
1211 goto out_old_dir;
1212 }
1213 }
1214 }
1215
1216 /*
1217 * If cross rename between file and directory those are not
1218 * in the same directory, we will inc nlink of file's parent
1219 * later, so we should check upper boundary of its nlink.
1220 */
1221 if ((!old_dir_entry || !new_dir_entry) &&
1222 old_dir_entry != new_dir_entry) {
1223 old_nlink = old_dir_entry ? -1 : 1;
1224 new_nlink = -old_nlink;
1225 err = -EMLINK;
1226 if ((old_nlink > 0 && old_dir->i_nlink >= F2FS_LINK_MAX) ||
1227 (new_nlink > 0 && new_dir->i_nlink >= F2FS_LINK_MAX))
1228 goto out_new_dir;
1229 }
1230
1231 f2fs_balance_fs(sbi, need: true);
1232
1233 f2fs_lock_op(sbi);
1234
1235 /* update ".." directory entry info of old dentry */
1236 if (old_dir_entry)
1237 f2fs_set_link(dir: old_inode, de: old_dir_entry, page: old_dir_page, inode: new_dir);
1238
1239 /* update ".." directory entry info of new dentry */
1240 if (new_dir_entry)
1241 f2fs_set_link(dir: new_inode, de: new_dir_entry, page: new_dir_page, inode: old_dir);
1242
1243 /* update directory entry info of old dir inode */
1244 f2fs_set_link(dir: old_dir, de: old_entry, page: old_page, inode: new_inode);
1245
1246 f2fs_down_write(sem: &F2FS_I(inode: old_inode)->i_sem);
1247 if (!old_dir_entry)
1248 file_lost_pino(old_inode);
1249 else
1250 /* adjust dir's i_pino to pass fsck check */
1251 f2fs_i_pino_write(inode: old_inode, pino: new_dir->i_ino);
1252 f2fs_up_write(sem: &F2FS_I(inode: old_inode)->i_sem);
1253
1254 inode_set_ctime_current(inode: old_dir);
1255 if (old_nlink) {
1256 f2fs_down_write(sem: &F2FS_I(inode: old_dir)->i_sem);
1257 f2fs_i_links_write(inode: old_dir, inc: old_nlink > 0);
1258 f2fs_up_write(sem: &F2FS_I(inode: old_dir)->i_sem);
1259 }
1260 f2fs_mark_inode_dirty_sync(inode: old_dir, sync: false);
1261
1262 /* update directory entry info of new dir inode */
1263 f2fs_set_link(dir: new_dir, de: new_entry, page: new_page, inode: old_inode);
1264
1265 f2fs_down_write(sem: &F2FS_I(inode: new_inode)->i_sem);
1266 if (!new_dir_entry)
1267 file_lost_pino(new_inode);
1268 else
1269 /* adjust dir's i_pino to pass fsck check */
1270 f2fs_i_pino_write(inode: new_inode, pino: old_dir->i_ino);
1271 f2fs_up_write(sem: &F2FS_I(inode: new_inode)->i_sem);
1272
1273 inode_set_ctime_current(inode: new_dir);
1274 if (new_nlink) {
1275 f2fs_down_write(sem: &F2FS_I(inode: new_dir)->i_sem);
1276 f2fs_i_links_write(inode: new_dir, inc: new_nlink > 0);
1277 f2fs_up_write(sem: &F2FS_I(inode: new_dir)->i_sem);
1278 }
1279 f2fs_mark_inode_dirty_sync(inode: new_dir, sync: false);
1280
1281 if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) {
1282 f2fs_add_ino_entry(sbi, ino: old_dir->i_ino, type: TRANS_DIR_INO);
1283 f2fs_add_ino_entry(sbi, ino: new_dir->i_ino, type: TRANS_DIR_INO);
1284 }
1285
1286 f2fs_unlock_op(sbi);
1287
1288 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
1289 f2fs_sync_fs(sb: sbi->sb, sync: 1);
1290
1291 f2fs_update_time(sbi, type: REQ_TIME);
1292 return 0;
1293out_new_dir:
1294 if (new_dir_entry) {
1295 f2fs_put_page(page: new_dir_page, unlock: 0);
1296 }
1297out_old_dir:
1298 if (old_dir_entry) {
1299 f2fs_put_page(page: old_dir_page, unlock: 0);
1300 }
1301out_new:
1302 f2fs_put_page(page: new_page, unlock: 0);
1303out_old:
1304 f2fs_put_page(page: old_page, unlock: 0);
1305out:
1306 return err;
1307}
1308
1309static int f2fs_rename2(struct mnt_idmap *idmap,
1310 struct inode *old_dir, struct dentry *old_dentry,
1311 struct inode *new_dir, struct dentry *new_dentry,
1312 unsigned int flags)
1313{
1314 int err;
1315
1316 if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
1317 return -EINVAL;
1318
1319 err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry,
1320 flags);
1321 if (err)
1322 return err;
1323
1324 if (flags & RENAME_EXCHANGE) {
1325 return f2fs_cross_rename(old_dir, old_dentry,
1326 new_dir, new_dentry);
1327 }
1328 /*
1329 * VFS has already handled the new dentry existence case,
1330 * here, we just deal with "RENAME_NOREPLACE" as regular rename.
1331 */
1332 return f2fs_rename(idmap, old_dir, old_dentry,
1333 new_dir, new_dentry, flags);
1334}
1335
1336static const char *f2fs_encrypted_get_link(struct dentry *dentry,
1337 struct inode *inode,
1338 struct delayed_call *done)
1339{
1340 struct page *page;
1341 const char *target;
1342
1343 if (!dentry)
1344 return ERR_PTR(error: -ECHILD);
1345
1346 page = read_mapping_page(mapping: inode->i_mapping, index: 0, NULL);
1347 if (IS_ERR(ptr: page))
1348 return ERR_CAST(ptr: page);
1349
1350 target = fscrypt_get_symlink(inode, page_address(page),
1351 max_size: inode->i_sb->s_blocksize, done);
1352 put_page(page);
1353 return target;
1354}
1355
1356static int f2fs_encrypted_symlink_getattr(struct mnt_idmap *idmap,
1357 const struct path *path,
1358 struct kstat *stat, u32 request_mask,
1359 unsigned int query_flags)
1360{
1361 f2fs_getattr(idmap, path, stat, request_mask, flags: query_flags);
1362
1363 return fscrypt_symlink_getattr(path, stat);
1364}
1365
1366const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
1367 .get_link = f2fs_encrypted_get_link,
1368 .getattr = f2fs_encrypted_symlink_getattr,
1369 .setattr = f2fs_setattr,
1370 .listxattr = f2fs_listxattr,
1371};
1372
1373const struct inode_operations f2fs_dir_inode_operations = {
1374 .create = f2fs_create,
1375 .lookup = f2fs_lookup,
1376 .link = f2fs_link,
1377 .unlink = f2fs_unlink,
1378 .symlink = f2fs_symlink,
1379 .mkdir = f2fs_mkdir,
1380 .rmdir = f2fs_rmdir,
1381 .mknod = f2fs_mknod,
1382 .rename = f2fs_rename2,
1383 .tmpfile = f2fs_tmpfile,
1384 .getattr = f2fs_getattr,
1385 .setattr = f2fs_setattr,
1386 .get_inode_acl = f2fs_get_acl,
1387 .set_acl = f2fs_set_acl,
1388 .listxattr = f2fs_listxattr,
1389 .fiemap = f2fs_fiemap,
1390 .fileattr_get = f2fs_fileattr_get,
1391 .fileattr_set = f2fs_fileattr_set,
1392};
1393
1394const struct inode_operations f2fs_symlink_inode_operations = {
1395 .get_link = f2fs_get_link,
1396 .getattr = f2fs_getattr,
1397 .setattr = f2fs_setattr,
1398 .listxattr = f2fs_listxattr,
1399};
1400
1401const struct inode_operations f2fs_special_inode_operations = {
1402 .getattr = f2fs_getattr,
1403 .setattr = f2fs_setattr,
1404 .get_inode_acl = f2fs_get_acl,
1405 .set_acl = f2fs_set_acl,
1406 .listxattr = f2fs_listxattr,
1407};
1408

source code of linux/fs/f2fs/namei.c