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Merge branch 'printk-rework' into for-linus
[mirror_ubuntu-jammy-kernel.git] / fs / exfat / namei.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
4 */
5
6 #include <linux/iversion.h>
7 #include <linux/namei.h>
8 #include <linux/slab.h>
9 #include <linux/buffer_head.h>
10 #include <linux/nls.h>
11
12 #include "exfat_raw.h"
13 #include "exfat_fs.h"
14
15 static inline unsigned long exfat_d_version(struct dentry *dentry)
16 {
17 return (unsigned long) dentry->d_fsdata;
18 }
19
20 static inline void exfat_d_version_set(struct dentry *dentry,
21 unsigned long version)
22 {
23 dentry->d_fsdata = (void *) version;
24 }
25
26 /*
27 * If new entry was created in the parent, it could create the 8.3 alias (the
28 * shortname of logname). So, the parent may have the negative-dentry which
29 * matches the created 8.3 alias.
30 *
31 * If it happened, the negative dentry isn't actually negative anymore. So,
32 * drop it.
33 */
34 static int exfat_d_revalidate(struct dentry *dentry, unsigned int flags)
35 {
36 int ret;
37
38 if (flags & LOOKUP_RCU)
39 return -ECHILD;
40
41 /*
42 * This is not negative dentry. Always valid.
43 *
44 * Note, rename() to existing directory entry will have ->d_inode, and
45 * will use existing name which isn't specified name by user.
46 *
47 * We may be able to drop this positive dentry here. But dropping
48 * positive dentry isn't good idea. So it's unsupported like
49 * rename("filename", "FILENAME") for now.
50 */
51 if (d_really_is_positive(dentry))
52 return 1;
53
54 /*
55 * Drop the negative dentry, in order to make sure to use the case
56 * sensitive name which is specified by user if this is for creation.
57 */
58 if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
59 return 0;
60
61 spin_lock(&dentry->d_lock);
62 ret = inode_eq_iversion(d_inode(dentry->d_parent),
63 exfat_d_version(dentry));
64 spin_unlock(&dentry->d_lock);
65 return ret;
66 }
67
68 /* returns the length of a struct qstr, ignoring trailing dots */
69 static unsigned int exfat_striptail_len(unsigned int len, const char *name)
70 {
71 while (len && name[len - 1] == '.')
72 len--;
73 return len;
74 }
75
76 /*
77 * Compute the hash for the exfat name corresponding to the dentry. If the name
78 * is invalid, we leave the hash code unchanged so that the existing dentry can
79 * be used. The exfat fs routines will return ENOENT or EINVAL as appropriate.
80 */
81 static int exfat_d_hash(const struct dentry *dentry, struct qstr *qstr)
82 {
83 struct super_block *sb = dentry->d_sb;
84 struct nls_table *t = EXFAT_SB(sb)->nls_io;
85 const unsigned char *name = qstr->name;
86 unsigned int len = exfat_striptail_len(qstr->len, qstr->name);
87 unsigned long hash = init_name_hash(dentry);
88 int i, charlen;
89 wchar_t c;
90
91 for (i = 0; i < len; i += charlen) {
92 charlen = t->char2uni(&name[i], len - i, &c);
93 if (charlen < 0)
94 return charlen;
95 hash = partial_name_hash(exfat_toupper(sb, c), hash);
96 }
97
98 qstr->hash = end_name_hash(hash);
99 return 0;
100 }
101
102 static int exfat_d_cmp(const struct dentry *dentry, unsigned int len,
103 const char *str, const struct qstr *name)
104 {
105 struct super_block *sb = dentry->d_sb;
106 struct nls_table *t = EXFAT_SB(sb)->nls_io;
107 unsigned int alen = exfat_striptail_len(name->len, name->name);
108 unsigned int blen = exfat_striptail_len(len, str);
109 wchar_t c1, c2;
110 int charlen, i;
111
112 if (alen != blen)
113 return 1;
114
115 for (i = 0; i < len; i += charlen) {
116 charlen = t->char2uni(&name->name[i], alen - i, &c1);
117 if (charlen < 0)
118 return 1;
119 if (charlen != t->char2uni(&str[i], blen - i, &c2))
120 return 1;
121
122 if (exfat_toupper(sb, c1) != exfat_toupper(sb, c2))
123 return 1;
124 }
125
126 return 0;
127 }
128
129 const struct dentry_operations exfat_dentry_ops = {
130 .d_revalidate = exfat_d_revalidate,
131 .d_hash = exfat_d_hash,
132 .d_compare = exfat_d_cmp,
133 };
134
135 static int exfat_utf8_d_hash(const struct dentry *dentry, struct qstr *qstr)
136 {
137 struct super_block *sb = dentry->d_sb;
138 const unsigned char *name = qstr->name;
139 unsigned int len = exfat_striptail_len(qstr->len, qstr->name);
140 unsigned long hash = init_name_hash(dentry);
141 int i, charlen;
142 unicode_t u;
143
144 for (i = 0; i < len; i += charlen) {
145 charlen = utf8_to_utf32(&name[i], len - i, &u);
146 if (charlen < 0)
147 return charlen;
148
149 /*
150 * exfat_toupper() works only for code points up to the U+FFFF.
151 */
152 hash = partial_name_hash(u <= 0xFFFF ? exfat_toupper(sb, u) : u,
153 hash);
154 }
155
156 qstr->hash = end_name_hash(hash);
157 return 0;
158 }
159
160 static int exfat_utf8_d_cmp(const struct dentry *dentry, unsigned int len,
161 const char *str, const struct qstr *name)
162 {
163 struct super_block *sb = dentry->d_sb;
164 unsigned int alen = exfat_striptail_len(name->len, name->name);
165 unsigned int blen = exfat_striptail_len(len, str);
166 unicode_t u_a, u_b;
167 int charlen, i;
168
169 if (alen != blen)
170 return 1;
171
172 for (i = 0; i < alen; i += charlen) {
173 charlen = utf8_to_utf32(&name->name[i], alen - i, &u_a);
174 if (charlen < 0)
175 return 1;
176 if (charlen != utf8_to_utf32(&str[i], blen - i, &u_b))
177 return 1;
178
179 if (u_a <= 0xFFFF && u_b <= 0xFFFF) {
180 if (exfat_toupper(sb, u_a) != exfat_toupper(sb, u_b))
181 return 1;
182 } else {
183 if (u_a != u_b)
184 return 1;
185 }
186 }
187
188 return 0;
189 }
190
191 const struct dentry_operations exfat_utf8_dentry_ops = {
192 .d_revalidate = exfat_d_revalidate,
193 .d_hash = exfat_utf8_d_hash,
194 .d_compare = exfat_utf8_d_cmp,
195 };
196
197 /* used only in search empty_slot() */
198 #define CNT_UNUSED_NOHIT (-1)
199 #define CNT_UNUSED_HIT (-2)
200 /* search EMPTY CONTINUOUS "num_entries" entries */
201 static int exfat_search_empty_slot(struct super_block *sb,
202 struct exfat_hint_femp *hint_femp, struct exfat_chain *p_dir,
203 int num_entries)
204 {
205 int i, dentry, num_empty = 0;
206 int dentries_per_clu;
207 unsigned int type;
208 struct exfat_chain clu;
209 struct exfat_dentry *ep;
210 struct exfat_sb_info *sbi = EXFAT_SB(sb);
211 struct buffer_head *bh;
212
213 dentries_per_clu = sbi->dentries_per_clu;
214
215 if (hint_femp->eidx != EXFAT_HINT_NONE) {
216 dentry = hint_femp->eidx;
217 if (num_entries <= hint_femp->count) {
218 hint_femp->eidx = EXFAT_HINT_NONE;
219 return dentry;
220 }
221
222 exfat_chain_dup(&clu, &hint_femp->cur);
223 } else {
224 exfat_chain_dup(&clu, p_dir);
225 dentry = 0;
226 }
227
228 while (clu.dir != EXFAT_EOF_CLUSTER) {
229 i = dentry & (dentries_per_clu - 1);
230
231 for (; i < dentries_per_clu; i++, dentry++) {
232 ep = exfat_get_dentry(sb, &clu, i, &bh, NULL);
233 if (!ep)
234 return -EIO;
235 type = exfat_get_entry_type(ep);
236 brelse(bh);
237
238 if (type == TYPE_UNUSED || type == TYPE_DELETED) {
239 num_empty++;
240 if (hint_femp->eidx == EXFAT_HINT_NONE) {
241 hint_femp->eidx = dentry;
242 hint_femp->count = CNT_UNUSED_NOHIT;
243 exfat_chain_set(&hint_femp->cur,
244 clu.dir, clu.size, clu.flags);
245 }
246
247 if (type == TYPE_UNUSED &&
248 hint_femp->count != CNT_UNUSED_HIT)
249 hint_femp->count = CNT_UNUSED_HIT;
250 } else {
251 if (hint_femp->eidx != EXFAT_HINT_NONE &&
252 hint_femp->count == CNT_UNUSED_HIT) {
253 /* unused empty group means
254 * an empty group which includes
255 * unused dentry
256 */
257 exfat_fs_error(sb,
258 "found bogus dentry(%d) beyond unused empty group(%d) (start_clu : %u, cur_clu : %u)",
259 dentry, hint_femp->eidx,
260 p_dir->dir, clu.dir);
261 return -EIO;
262 }
263
264 num_empty = 0;
265 hint_femp->eidx = EXFAT_HINT_NONE;
266 }
267
268 if (num_empty >= num_entries) {
269 /* found and invalidate hint_femp */
270 hint_femp->eidx = EXFAT_HINT_NONE;
271 return (dentry - (num_entries - 1));
272 }
273 }
274
275 if (clu.flags == ALLOC_NO_FAT_CHAIN) {
276 if (--clu.size > 0)
277 clu.dir++;
278 else
279 clu.dir = EXFAT_EOF_CLUSTER;
280 } else {
281 if (exfat_get_next_cluster(sb, &clu.dir))
282 return -EIO;
283 }
284 }
285
286 return -ENOSPC;
287 }
288
289 static int exfat_check_max_dentries(struct inode *inode)
290 {
291 if (EXFAT_B_TO_DEN(i_size_read(inode)) >= MAX_EXFAT_DENTRIES) {
292 /*
293 * exFAT spec allows a dir to grow up to 8388608(256MB)
294 * dentries
295 */
296 return -ENOSPC;
297 }
298 return 0;
299 }
300
301 /* find empty directory entry.
302 * if there isn't any empty slot, expand cluster chain.
303 */
304 static int exfat_find_empty_entry(struct inode *inode,
305 struct exfat_chain *p_dir, int num_entries)
306 {
307 int dentry;
308 unsigned int ret, last_clu;
309 sector_t sector;
310 loff_t size = 0;
311 struct exfat_chain clu;
312 struct exfat_dentry *ep = NULL;
313 struct super_block *sb = inode->i_sb;
314 struct exfat_sb_info *sbi = EXFAT_SB(sb);
315 struct exfat_inode_info *ei = EXFAT_I(inode);
316 struct exfat_hint_femp hint_femp;
317
318 hint_femp.eidx = EXFAT_HINT_NONE;
319
320 if (ei->hint_femp.eidx != EXFAT_HINT_NONE) {
321 hint_femp = ei->hint_femp;
322 ei->hint_femp.eidx = EXFAT_HINT_NONE;
323 }
324
325 while ((dentry = exfat_search_empty_slot(sb, &hint_femp, p_dir,
326 num_entries)) < 0) {
327 if (dentry == -EIO)
328 break;
329
330 if (exfat_check_max_dentries(inode))
331 return -ENOSPC;
332
333 /* we trust p_dir->size regardless of FAT type */
334 if (exfat_find_last_cluster(sb, p_dir, &last_clu))
335 return -EIO;
336
337 /*
338 * Allocate new cluster to this directory
339 */
340 exfat_chain_set(&clu, last_clu + 1, 0, p_dir->flags);
341
342 /* allocate a cluster */
343 ret = exfat_alloc_cluster(inode, 1, &clu);
344 if (ret)
345 return ret;
346
347 if (exfat_zeroed_cluster(inode, clu.dir))
348 return -EIO;
349
350 /* append to the FAT chain */
351 if (clu.flags != p_dir->flags) {
352 /* no-fat-chain bit is disabled,
353 * so fat-chain should be synced with alloc-bitmap
354 */
355 exfat_chain_cont_cluster(sb, p_dir->dir, p_dir->size);
356 p_dir->flags = ALLOC_FAT_CHAIN;
357 hint_femp.cur.flags = ALLOC_FAT_CHAIN;
358 }
359
360 if (clu.flags == ALLOC_FAT_CHAIN)
361 if (exfat_ent_set(sb, last_clu, clu.dir))
362 return -EIO;
363
364 if (hint_femp.eidx == EXFAT_HINT_NONE) {
365 /* the special case that new dentry
366 * should be allocated from the start of new cluster
367 */
368 hint_femp.eidx = EXFAT_B_TO_DEN_IDX(p_dir->size, sbi);
369 hint_femp.count = sbi->dentries_per_clu;
370
371 exfat_chain_set(&hint_femp.cur, clu.dir, 0, clu.flags);
372 }
373 hint_femp.cur.size++;
374 p_dir->size++;
375 size = EXFAT_CLU_TO_B(p_dir->size, sbi);
376
377 /* update the directory entry */
378 if (p_dir->dir != sbi->root_dir) {
379 struct buffer_head *bh;
380
381 ep = exfat_get_dentry(sb,
382 &(ei->dir), ei->entry + 1, &bh, &sector);
383 if (!ep)
384 return -EIO;
385
386 ep->dentry.stream.valid_size = cpu_to_le64(size);
387 ep->dentry.stream.size = ep->dentry.stream.valid_size;
388 ep->dentry.stream.flags = p_dir->flags;
389 exfat_update_bh(bh, IS_DIRSYNC(inode));
390 brelse(bh);
391 if (exfat_update_dir_chksum(inode, &(ei->dir),
392 ei->entry))
393 return -EIO;
394 }
395
396 /* directory inode should be updated in here */
397 i_size_write(inode, size);
398 EXFAT_I(inode)->i_size_ondisk += sbi->cluster_size;
399 EXFAT_I(inode)->i_size_aligned += sbi->cluster_size;
400 EXFAT_I(inode)->flags = p_dir->flags;
401 inode->i_blocks += 1 << sbi->sect_per_clus_bits;
402 }
403
404 return dentry;
405 }
406
407 /*
408 * Name Resolution Functions :
409 * Zero if it was successful; otherwise nonzero.
410 */
411 static int __exfat_resolve_path(struct inode *inode, const unsigned char *path,
412 struct exfat_chain *p_dir, struct exfat_uni_name *p_uniname,
413 int lookup)
414 {
415 int namelen;
416 int lossy = NLS_NAME_NO_LOSSY;
417 struct super_block *sb = inode->i_sb;
418 struct exfat_sb_info *sbi = EXFAT_SB(sb);
419 struct exfat_inode_info *ei = EXFAT_I(inode);
420
421 /* strip all trailing periods */
422 namelen = exfat_striptail_len(strlen(path), path);
423 if (!namelen)
424 return -ENOENT;
425
426 if (strlen(path) > (MAX_NAME_LENGTH * MAX_CHARSET_SIZE))
427 return -ENAMETOOLONG;
428
429 /*
430 * strip all leading spaces :
431 * "MS windows 7" supports leading spaces.
432 * So we should skip this preprocessing for compatibility.
433 */
434
435 /* file name conversion :
436 * If lookup case, we allow bad-name for compatibility.
437 */
438 namelen = exfat_nls_to_utf16(sb, path, namelen, p_uniname,
439 &lossy);
440 if (namelen < 0)
441 return namelen; /* return error value */
442
443 if ((lossy && !lookup) || !namelen)
444 return -EINVAL;
445
446 exfat_chain_set(p_dir, ei->start_clu,
447 EXFAT_B_TO_CLU(i_size_read(inode), sbi), ei->flags);
448
449 return 0;
450 }
451
452 static inline int exfat_resolve_path(struct inode *inode,
453 const unsigned char *path, struct exfat_chain *dir,
454 struct exfat_uni_name *uni)
455 {
456 return __exfat_resolve_path(inode, path, dir, uni, 0);
457 }
458
459 static inline int exfat_resolve_path_for_lookup(struct inode *inode,
460 const unsigned char *path, struct exfat_chain *dir,
461 struct exfat_uni_name *uni)
462 {
463 return __exfat_resolve_path(inode, path, dir, uni, 1);
464 }
465
466 static inline loff_t exfat_make_i_pos(struct exfat_dir_entry *info)
467 {
468 return ((loff_t) info->dir.dir << 32) | (info->entry & 0xffffffff);
469 }
470
471 static int exfat_add_entry(struct inode *inode, const char *path,
472 struct exfat_chain *p_dir, unsigned int type,
473 struct exfat_dir_entry *info)
474 {
475 int ret, dentry, num_entries;
476 struct super_block *sb = inode->i_sb;
477 struct exfat_sb_info *sbi = EXFAT_SB(sb);
478 struct exfat_uni_name uniname;
479 struct exfat_chain clu;
480 int clu_size = 0;
481 unsigned int start_clu = EXFAT_FREE_CLUSTER;
482
483 ret = exfat_resolve_path(inode, path, p_dir, &uniname);
484 if (ret)
485 goto out;
486
487 num_entries = exfat_calc_num_entries(&uniname);
488 if (num_entries < 0) {
489 ret = num_entries;
490 goto out;
491 }
492
493 /* exfat_find_empty_entry must be called before alloc_cluster() */
494 dentry = exfat_find_empty_entry(inode, p_dir, num_entries);
495 if (dentry < 0) {
496 ret = dentry; /* -EIO or -ENOSPC */
497 goto out;
498 }
499
500 if (type == TYPE_DIR) {
501 ret = exfat_alloc_new_dir(inode, &clu);
502 if (ret)
503 goto out;
504 start_clu = clu.dir;
505 clu_size = sbi->cluster_size;
506 }
507
508 /* update the directory entry */
509 /* fill the dos name directory entry information of the created file.
510 * the first cluster is not determined yet. (0)
511 */
512 ret = exfat_init_dir_entry(inode, p_dir, dentry, type,
513 start_clu, clu_size);
514 if (ret)
515 goto out;
516
517 ret = exfat_init_ext_entry(inode, p_dir, dentry, num_entries, &uniname);
518 if (ret)
519 goto out;
520
521 info->dir = *p_dir;
522 info->entry = dentry;
523 info->flags = ALLOC_NO_FAT_CHAIN;
524 info->type = type;
525
526 if (type == TYPE_FILE) {
527 info->attr = ATTR_ARCHIVE;
528 info->start_clu = EXFAT_EOF_CLUSTER;
529 info->size = 0;
530 info->num_subdirs = 0;
531 } else {
532 info->attr = ATTR_SUBDIR;
533 info->start_clu = start_clu;
534 info->size = clu_size;
535 info->num_subdirs = EXFAT_MIN_SUBDIR;
536 }
537 memset(&info->crtime, 0, sizeof(info->crtime));
538 memset(&info->mtime, 0, sizeof(info->mtime));
539 memset(&info->atime, 0, sizeof(info->atime));
540 out:
541 return ret;
542 }
543
544 static int exfat_create(struct user_namespace *mnt_userns, struct inode *dir,
545 struct dentry *dentry, umode_t mode, bool excl)
546 {
547 struct super_block *sb = dir->i_sb;
548 struct inode *inode;
549 struct exfat_chain cdir;
550 struct exfat_dir_entry info;
551 loff_t i_pos;
552 int err;
553
554 mutex_lock(&EXFAT_SB(sb)->s_lock);
555 exfat_set_volume_dirty(sb);
556 err = exfat_add_entry(dir, dentry->d_name.name, &cdir, TYPE_FILE,
557 &info);
558 exfat_clear_volume_dirty(sb);
559 if (err)
560 goto unlock;
561
562 inode_inc_iversion(dir);
563 dir->i_ctime = dir->i_mtime = current_time(dir);
564 if (IS_DIRSYNC(dir))
565 exfat_sync_inode(dir);
566 else
567 mark_inode_dirty(dir);
568
569 i_pos = exfat_make_i_pos(&info);
570 inode = exfat_build_inode(sb, &info, i_pos);
571 err = PTR_ERR_OR_ZERO(inode);
572 if (err)
573 goto unlock;
574
575 inode_inc_iversion(inode);
576 inode->i_mtime = inode->i_atime = inode->i_ctime =
577 EXFAT_I(inode)->i_crtime = current_time(inode);
578 exfat_truncate_atime(&inode->i_atime);
579 /* timestamp is already written, so mark_inode_dirty() is unneeded. */
580
581 d_instantiate(dentry, inode);
582 unlock:
583 mutex_unlock(&EXFAT_SB(sb)->s_lock);
584 return err;
585 }
586
587 /* lookup a file */
588 static int exfat_find(struct inode *dir, struct qstr *qname,
589 struct exfat_dir_entry *info)
590 {
591 int ret, dentry, num_entries, count;
592 struct exfat_chain cdir;
593 struct exfat_uni_name uni_name;
594 struct super_block *sb = dir->i_sb;
595 struct exfat_sb_info *sbi = EXFAT_SB(sb);
596 struct exfat_inode_info *ei = EXFAT_I(dir);
597 struct exfat_dentry *ep, *ep2;
598 struct exfat_entry_set_cache *es;
599
600 if (qname->len == 0)
601 return -ENOENT;
602
603 /* check the validity of directory name in the given pathname */
604 ret = exfat_resolve_path_for_lookup(dir, qname->name, &cdir, &uni_name);
605 if (ret)
606 return ret;
607
608 num_entries = exfat_calc_num_entries(&uni_name);
609 if (num_entries < 0)
610 return num_entries;
611
612 /* check the validation of hint_stat and initialize it if required */
613 if (ei->version != (inode_peek_iversion_raw(dir) & 0xffffffff)) {
614 ei->hint_stat.clu = cdir.dir;
615 ei->hint_stat.eidx = 0;
616 ei->version = (inode_peek_iversion_raw(dir) & 0xffffffff);
617 ei->hint_femp.eidx = EXFAT_HINT_NONE;
618 }
619
620 /* search the file name for directories */
621 dentry = exfat_find_dir_entry(sb, ei, &cdir, &uni_name,
622 num_entries, TYPE_ALL);
623
624 if (dentry < 0)
625 return dentry; /* -error value */
626
627 info->dir = cdir;
628 info->entry = dentry;
629 info->num_subdirs = 0;
630
631 es = exfat_get_dentry_set(sb, &cdir, dentry, ES_2_ENTRIES);
632 if (!es)
633 return -EIO;
634 ep = exfat_get_dentry_cached(es, 0);
635 ep2 = exfat_get_dentry_cached(es, 1);
636
637 info->type = exfat_get_entry_type(ep);
638 info->attr = le16_to_cpu(ep->dentry.file.attr);
639 info->size = le64_to_cpu(ep2->dentry.stream.valid_size);
640 if ((info->type == TYPE_FILE) && (info->size == 0)) {
641 info->flags = ALLOC_NO_FAT_CHAIN;
642 info->start_clu = EXFAT_EOF_CLUSTER;
643 } else {
644 info->flags = ep2->dentry.stream.flags;
645 info->start_clu =
646 le32_to_cpu(ep2->dentry.stream.start_clu);
647 }
648
649 exfat_get_entry_time(sbi, &info->crtime,
650 ep->dentry.file.create_tz,
651 ep->dentry.file.create_time,
652 ep->dentry.file.create_date,
653 ep->dentry.file.create_time_cs);
654 exfat_get_entry_time(sbi, &info->mtime,
655 ep->dentry.file.modify_tz,
656 ep->dentry.file.modify_time,
657 ep->dentry.file.modify_date,
658 ep->dentry.file.modify_time_cs);
659 exfat_get_entry_time(sbi, &info->atime,
660 ep->dentry.file.access_tz,
661 ep->dentry.file.access_time,
662 ep->dentry.file.access_date,
663 0);
664 exfat_free_dentry_set(es, false);
665
666 if (ei->start_clu == EXFAT_FREE_CLUSTER) {
667 exfat_fs_error(sb,
668 "non-zero size file starts with zero cluster (size : %llu, p_dir : %u, entry : 0x%08x)",
669 i_size_read(dir), ei->dir.dir, ei->entry);
670 return -EIO;
671 }
672
673 if (info->type == TYPE_DIR) {
674 exfat_chain_set(&cdir, info->start_clu,
675 EXFAT_B_TO_CLU(info->size, sbi), info->flags);
676 count = exfat_count_dir_entries(sb, &cdir);
677 if (count < 0)
678 return -EIO;
679
680 info->num_subdirs = count + EXFAT_MIN_SUBDIR;
681 }
682 return 0;
683 }
684
685 static int exfat_d_anon_disconn(struct dentry *dentry)
686 {
687 return IS_ROOT(dentry) && (dentry->d_flags & DCACHE_DISCONNECTED);
688 }
689
690 static struct dentry *exfat_lookup(struct inode *dir, struct dentry *dentry,
691 unsigned int flags)
692 {
693 struct super_block *sb = dir->i_sb;
694 struct inode *inode;
695 struct dentry *alias;
696 struct exfat_dir_entry info;
697 int err;
698 loff_t i_pos;
699 mode_t i_mode;
700
701 mutex_lock(&EXFAT_SB(sb)->s_lock);
702 err = exfat_find(dir, &dentry->d_name, &info);
703 if (err) {
704 if (err == -ENOENT) {
705 inode = NULL;
706 goto out;
707 }
708 goto unlock;
709 }
710
711 i_pos = exfat_make_i_pos(&info);
712 inode = exfat_build_inode(sb, &info, i_pos);
713 err = PTR_ERR_OR_ZERO(inode);
714 if (err)
715 goto unlock;
716
717 i_mode = inode->i_mode;
718 alias = d_find_alias(inode);
719
720 /*
721 * Checking "alias->d_parent == dentry->d_parent" to make sure
722 * FS is not corrupted (especially double linked dir).
723 */
724 if (alias && alias->d_parent == dentry->d_parent &&
725 !exfat_d_anon_disconn(alias)) {
726
727 /*
728 * Unhashed alias is able to exist because of revalidate()
729 * called by lookup_fast. You can easily make this status
730 * by calling create and lookup concurrently
731 * In such case, we reuse an alias instead of new dentry
732 */
733 if (d_unhashed(alias)) {
734 WARN_ON(alias->d_name.hash_len !=
735 dentry->d_name.hash_len);
736 exfat_info(sb, "rehashed a dentry(%p) in read lookup",
737 alias);
738 d_drop(dentry);
739 d_rehash(alias);
740 } else if (!S_ISDIR(i_mode)) {
741 /*
742 * This inode has non anonymous-DCACHE_DISCONNECTED
743 * dentry. This means, the user did ->lookup() by an
744 * another name (longname vs 8.3 alias of it) in past.
745 *
746 * Switch to new one for reason of locality if possible.
747 */
748 d_move(alias, dentry);
749 }
750 iput(inode);
751 mutex_unlock(&EXFAT_SB(sb)->s_lock);
752 return alias;
753 }
754 dput(alias);
755 out:
756 mutex_unlock(&EXFAT_SB(sb)->s_lock);
757 if (!inode)
758 exfat_d_version_set(dentry, inode_query_iversion(dir));
759
760 return d_splice_alias(inode, dentry);
761 unlock:
762 mutex_unlock(&EXFAT_SB(sb)->s_lock);
763 return ERR_PTR(err);
764 }
765
766 /* remove an entry, BUT don't truncate */
767 static int exfat_unlink(struct inode *dir, struct dentry *dentry)
768 {
769 struct exfat_chain cdir;
770 struct exfat_dentry *ep;
771 struct super_block *sb = dir->i_sb;
772 struct inode *inode = dentry->d_inode;
773 struct exfat_inode_info *ei = EXFAT_I(inode);
774 struct buffer_head *bh;
775 sector_t sector;
776 int num_entries, entry, err = 0;
777
778 mutex_lock(&EXFAT_SB(sb)->s_lock);
779 exfat_chain_dup(&cdir, &ei->dir);
780 entry = ei->entry;
781 if (ei->dir.dir == DIR_DELETED) {
782 exfat_err(sb, "abnormal access to deleted dentry");
783 err = -ENOENT;
784 goto unlock;
785 }
786
787 ep = exfat_get_dentry(sb, &cdir, entry, &bh, &sector);
788 if (!ep) {
789 err = -EIO;
790 goto unlock;
791 }
792 num_entries = exfat_count_ext_entries(sb, &cdir, entry, ep);
793 if (num_entries < 0) {
794 err = -EIO;
795 brelse(bh);
796 goto unlock;
797 }
798 num_entries++;
799 brelse(bh);
800
801 exfat_set_volume_dirty(sb);
802 /* update the directory entry */
803 if (exfat_remove_entries(dir, &cdir, entry, 0, num_entries)) {
804 err = -EIO;
805 goto unlock;
806 }
807
808 /* This doesn't modify ei */
809 ei->dir.dir = DIR_DELETED;
810 exfat_clear_volume_dirty(sb);
811
812 inode_inc_iversion(dir);
813 dir->i_mtime = dir->i_atime = current_time(dir);
814 exfat_truncate_atime(&dir->i_atime);
815 if (IS_DIRSYNC(dir))
816 exfat_sync_inode(dir);
817 else
818 mark_inode_dirty(dir);
819
820 clear_nlink(inode);
821 inode->i_mtime = inode->i_atime = current_time(inode);
822 exfat_truncate_atime(&inode->i_atime);
823 exfat_unhash_inode(inode);
824 exfat_d_version_set(dentry, inode_query_iversion(dir));
825 unlock:
826 mutex_unlock(&EXFAT_SB(sb)->s_lock);
827 return err;
828 }
829
830 static int exfat_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
831 struct dentry *dentry, umode_t mode)
832 {
833 struct super_block *sb = dir->i_sb;
834 struct inode *inode;
835 struct exfat_dir_entry info;
836 struct exfat_chain cdir;
837 loff_t i_pos;
838 int err;
839
840 mutex_lock(&EXFAT_SB(sb)->s_lock);
841 exfat_set_volume_dirty(sb);
842 err = exfat_add_entry(dir, dentry->d_name.name, &cdir, TYPE_DIR,
843 &info);
844 exfat_clear_volume_dirty(sb);
845 if (err)
846 goto unlock;
847
848 inode_inc_iversion(dir);
849 dir->i_ctime = dir->i_mtime = current_time(dir);
850 if (IS_DIRSYNC(dir))
851 exfat_sync_inode(dir);
852 else
853 mark_inode_dirty(dir);
854 inc_nlink(dir);
855
856 i_pos = exfat_make_i_pos(&info);
857 inode = exfat_build_inode(sb, &info, i_pos);
858 err = PTR_ERR_OR_ZERO(inode);
859 if (err)
860 goto unlock;
861
862 inode_inc_iversion(inode);
863 inode->i_mtime = inode->i_atime = inode->i_ctime =
864 EXFAT_I(inode)->i_crtime = current_time(inode);
865 exfat_truncate_atime(&inode->i_atime);
866 /* timestamp is already written, so mark_inode_dirty() is unneeded. */
867
868 d_instantiate(dentry, inode);
869
870 unlock:
871 mutex_unlock(&EXFAT_SB(sb)->s_lock);
872 return err;
873 }
874
875 static int exfat_check_dir_empty(struct super_block *sb,
876 struct exfat_chain *p_dir)
877 {
878 int i, dentries_per_clu;
879 unsigned int type;
880 struct exfat_chain clu;
881 struct exfat_dentry *ep;
882 struct exfat_sb_info *sbi = EXFAT_SB(sb);
883 struct buffer_head *bh;
884
885 dentries_per_clu = sbi->dentries_per_clu;
886
887 exfat_chain_dup(&clu, p_dir);
888
889 while (clu.dir != EXFAT_EOF_CLUSTER) {
890 for (i = 0; i < dentries_per_clu; i++) {
891 ep = exfat_get_dentry(sb, &clu, i, &bh, NULL);
892 if (!ep)
893 return -EIO;
894 type = exfat_get_entry_type(ep);
895 brelse(bh);
896 if (type == TYPE_UNUSED)
897 return 0;
898
899 if (type != TYPE_FILE && type != TYPE_DIR)
900 continue;
901
902 return -ENOTEMPTY;
903 }
904
905 if (clu.flags == ALLOC_NO_FAT_CHAIN) {
906 if (--clu.size > 0)
907 clu.dir++;
908 else
909 clu.dir = EXFAT_EOF_CLUSTER;
910 } else {
911 if (exfat_get_next_cluster(sb, &(clu.dir)))
912 return -EIO;
913 }
914 }
915
916 return 0;
917 }
918
919 static int exfat_rmdir(struct inode *dir, struct dentry *dentry)
920 {
921 struct inode *inode = dentry->d_inode;
922 struct exfat_dentry *ep;
923 struct exfat_chain cdir, clu_to_free;
924 struct super_block *sb = inode->i_sb;
925 struct exfat_sb_info *sbi = EXFAT_SB(sb);
926 struct exfat_inode_info *ei = EXFAT_I(inode);
927 struct buffer_head *bh;
928 sector_t sector;
929 int num_entries, entry, err;
930
931 mutex_lock(&EXFAT_SB(inode->i_sb)->s_lock);
932
933 exfat_chain_dup(&cdir, &ei->dir);
934 entry = ei->entry;
935
936 if (ei->dir.dir == DIR_DELETED) {
937 exfat_err(sb, "abnormal access to deleted dentry");
938 err = -ENOENT;
939 goto unlock;
940 }
941
942 exfat_chain_set(&clu_to_free, ei->start_clu,
943 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(inode), sbi), ei->flags);
944
945 err = exfat_check_dir_empty(sb, &clu_to_free);
946 if (err) {
947 if (err == -EIO)
948 exfat_err(sb, "failed to exfat_check_dir_empty : err(%d)",
949 err);
950 goto unlock;
951 }
952
953 ep = exfat_get_dentry(sb, &cdir, entry, &bh, &sector);
954 if (!ep) {
955 err = -EIO;
956 goto unlock;
957 }
958
959 num_entries = exfat_count_ext_entries(sb, &cdir, entry, ep);
960 if (num_entries < 0) {
961 err = -EIO;
962 brelse(bh);
963 goto unlock;
964 }
965 num_entries++;
966 brelse(bh);
967
968 exfat_set_volume_dirty(sb);
969 err = exfat_remove_entries(dir, &cdir, entry, 0, num_entries);
970 if (err) {
971 exfat_err(sb, "failed to exfat_remove_entries : err(%d)", err);
972 goto unlock;
973 }
974 ei->dir.dir = DIR_DELETED;
975 exfat_clear_volume_dirty(sb);
976
977 inode_inc_iversion(dir);
978 dir->i_mtime = dir->i_atime = current_time(dir);
979 exfat_truncate_atime(&dir->i_atime);
980 if (IS_DIRSYNC(dir))
981 exfat_sync_inode(dir);
982 else
983 mark_inode_dirty(dir);
984 drop_nlink(dir);
985
986 clear_nlink(inode);
987 inode->i_mtime = inode->i_atime = current_time(inode);
988 exfat_truncate_atime(&inode->i_atime);
989 exfat_unhash_inode(inode);
990 exfat_d_version_set(dentry, inode_query_iversion(dir));
991 unlock:
992 mutex_unlock(&EXFAT_SB(inode->i_sb)->s_lock);
993 return err;
994 }
995
996 static int exfat_rename_file(struct inode *inode, struct exfat_chain *p_dir,
997 int oldentry, struct exfat_uni_name *p_uniname,
998 struct exfat_inode_info *ei)
999 {
1000 int ret, num_old_entries, num_new_entries;
1001 sector_t sector_old, sector_new;
1002 struct exfat_dentry *epold, *epnew;
1003 struct super_block *sb = inode->i_sb;
1004 struct buffer_head *new_bh, *old_bh;
1005 int sync = IS_DIRSYNC(inode);
1006
1007 epold = exfat_get_dentry(sb, p_dir, oldentry, &old_bh, &sector_old);
1008 if (!epold)
1009 return -EIO;
1010
1011 num_old_entries = exfat_count_ext_entries(sb, p_dir, oldentry, epold);
1012 if (num_old_entries < 0)
1013 return -EIO;
1014 num_old_entries++;
1015
1016 num_new_entries = exfat_calc_num_entries(p_uniname);
1017 if (num_new_entries < 0)
1018 return num_new_entries;
1019
1020 if (num_old_entries < num_new_entries) {
1021 int newentry;
1022
1023 newentry =
1024 exfat_find_empty_entry(inode, p_dir, num_new_entries);
1025 if (newentry < 0)
1026 return newentry; /* -EIO or -ENOSPC */
1027
1028 epnew = exfat_get_dentry(sb, p_dir, newentry, &new_bh,
1029 &sector_new);
1030 if (!epnew)
1031 return -EIO;
1032
1033 *epnew = *epold;
1034 if (exfat_get_entry_type(epnew) == TYPE_FILE) {
1035 epnew->dentry.file.attr |= cpu_to_le16(ATTR_ARCHIVE);
1036 ei->attr |= ATTR_ARCHIVE;
1037 }
1038 exfat_update_bh(new_bh, sync);
1039 brelse(old_bh);
1040 brelse(new_bh);
1041
1042 epold = exfat_get_dentry(sb, p_dir, oldentry + 1, &old_bh,
1043 &sector_old);
1044 if (!epold)
1045 return -EIO;
1046 epnew = exfat_get_dentry(sb, p_dir, newentry + 1, &new_bh,
1047 &sector_new);
1048 if (!epnew) {
1049 brelse(old_bh);
1050 return -EIO;
1051 }
1052
1053 *epnew = *epold;
1054 exfat_update_bh(new_bh, sync);
1055 brelse(old_bh);
1056 brelse(new_bh);
1057
1058 ret = exfat_init_ext_entry(inode, p_dir, newentry,
1059 num_new_entries, p_uniname);
1060 if (ret)
1061 return ret;
1062
1063 exfat_remove_entries(inode, p_dir, oldentry, 0,
1064 num_old_entries);
1065 ei->entry = newentry;
1066 } else {
1067 if (exfat_get_entry_type(epold) == TYPE_FILE) {
1068 epold->dentry.file.attr |= cpu_to_le16(ATTR_ARCHIVE);
1069 ei->attr |= ATTR_ARCHIVE;
1070 }
1071 exfat_update_bh(old_bh, sync);
1072 brelse(old_bh);
1073 ret = exfat_init_ext_entry(inode, p_dir, oldentry,
1074 num_new_entries, p_uniname);
1075 if (ret)
1076 return ret;
1077
1078 exfat_remove_entries(inode, p_dir, oldentry, num_new_entries,
1079 num_old_entries);
1080 }
1081 return 0;
1082 }
1083
1084 static int exfat_move_file(struct inode *inode, struct exfat_chain *p_olddir,
1085 int oldentry, struct exfat_chain *p_newdir,
1086 struct exfat_uni_name *p_uniname, struct exfat_inode_info *ei)
1087 {
1088 int ret, newentry, num_new_entries, num_old_entries;
1089 sector_t sector_mov, sector_new;
1090 struct exfat_dentry *epmov, *epnew;
1091 struct super_block *sb = inode->i_sb;
1092 struct buffer_head *mov_bh, *new_bh;
1093
1094 epmov = exfat_get_dentry(sb, p_olddir, oldentry, &mov_bh, &sector_mov);
1095 if (!epmov)
1096 return -EIO;
1097
1098 num_old_entries = exfat_count_ext_entries(sb, p_olddir, oldentry,
1099 epmov);
1100 if (num_old_entries < 0)
1101 return -EIO;
1102 num_old_entries++;
1103
1104 num_new_entries = exfat_calc_num_entries(p_uniname);
1105 if (num_new_entries < 0)
1106 return num_new_entries;
1107
1108 newentry = exfat_find_empty_entry(inode, p_newdir, num_new_entries);
1109 if (newentry < 0)
1110 return newentry; /* -EIO or -ENOSPC */
1111
1112 epnew = exfat_get_dentry(sb, p_newdir, newentry, &new_bh, &sector_new);
1113 if (!epnew)
1114 return -EIO;
1115
1116 *epnew = *epmov;
1117 if (exfat_get_entry_type(epnew) == TYPE_FILE) {
1118 epnew->dentry.file.attr |= cpu_to_le16(ATTR_ARCHIVE);
1119 ei->attr |= ATTR_ARCHIVE;
1120 }
1121 exfat_update_bh(new_bh, IS_DIRSYNC(inode));
1122 brelse(mov_bh);
1123 brelse(new_bh);
1124
1125 epmov = exfat_get_dentry(sb, p_olddir, oldentry + 1, &mov_bh,
1126 &sector_mov);
1127 if (!epmov)
1128 return -EIO;
1129 epnew = exfat_get_dentry(sb, p_newdir, newentry + 1, &new_bh,
1130 &sector_new);
1131 if (!epnew) {
1132 brelse(mov_bh);
1133 return -EIO;
1134 }
1135
1136 *epnew = *epmov;
1137 exfat_update_bh(new_bh, IS_DIRSYNC(inode));
1138 brelse(mov_bh);
1139 brelse(new_bh);
1140
1141 ret = exfat_init_ext_entry(inode, p_newdir, newentry, num_new_entries,
1142 p_uniname);
1143 if (ret)
1144 return ret;
1145
1146 exfat_remove_entries(inode, p_olddir, oldentry, 0, num_old_entries);
1147
1148 exfat_chain_set(&ei->dir, p_newdir->dir, p_newdir->size,
1149 p_newdir->flags);
1150
1151 ei->entry = newentry;
1152 return 0;
1153 }
1154
1155 static void exfat_update_parent_info(struct exfat_inode_info *ei,
1156 struct inode *parent_inode)
1157 {
1158 struct exfat_sb_info *sbi = EXFAT_SB(parent_inode->i_sb);
1159 struct exfat_inode_info *parent_ei = EXFAT_I(parent_inode);
1160 loff_t parent_isize = i_size_read(parent_inode);
1161
1162 /*
1163 * the problem that struct exfat_inode_info caches wrong parent info.
1164 *
1165 * because of flag-mismatch of ei->dir,
1166 * there is abnormal traversing cluster chain.
1167 */
1168 if (unlikely(parent_ei->flags != ei->dir.flags ||
1169 parent_isize != EXFAT_CLU_TO_B(ei->dir.size, sbi) ||
1170 parent_ei->start_clu != ei->dir.dir)) {
1171 exfat_chain_set(&ei->dir, parent_ei->start_clu,
1172 EXFAT_B_TO_CLU_ROUND_UP(parent_isize, sbi),
1173 parent_ei->flags);
1174 }
1175 }
1176
1177 /* rename or move a old file into a new file */
1178 static int __exfat_rename(struct inode *old_parent_inode,
1179 struct exfat_inode_info *ei, struct inode *new_parent_inode,
1180 struct dentry *new_dentry)
1181 {
1182 int ret;
1183 int dentry;
1184 struct exfat_chain olddir, newdir;
1185 struct exfat_chain *p_dir = NULL;
1186 struct exfat_uni_name uni_name;
1187 struct exfat_dentry *ep;
1188 struct super_block *sb = old_parent_inode->i_sb;
1189 struct exfat_sb_info *sbi = EXFAT_SB(sb);
1190 const unsigned char *new_path = new_dentry->d_name.name;
1191 struct inode *new_inode = new_dentry->d_inode;
1192 int num_entries;
1193 struct exfat_inode_info *new_ei = NULL;
1194 unsigned int new_entry_type = TYPE_UNUSED;
1195 int new_entry = 0;
1196 struct buffer_head *old_bh, *new_bh = NULL;
1197
1198 /* check the validity of pointer parameters */
1199 if (new_path == NULL || strlen(new_path) == 0)
1200 return -EINVAL;
1201
1202 if (ei->dir.dir == DIR_DELETED) {
1203 exfat_err(sb, "abnormal access to deleted source dentry");
1204 return -ENOENT;
1205 }
1206
1207 exfat_update_parent_info(ei, old_parent_inode);
1208
1209 exfat_chain_dup(&olddir, &ei->dir);
1210 dentry = ei->entry;
1211
1212 ep = exfat_get_dentry(sb, &olddir, dentry, &old_bh, NULL);
1213 if (!ep) {
1214 ret = -EIO;
1215 goto out;
1216 }
1217 brelse(old_bh);
1218
1219 /* check whether new dir is existing directory and empty */
1220 if (new_inode) {
1221 ret = -EIO;
1222 new_ei = EXFAT_I(new_inode);
1223
1224 if (new_ei->dir.dir == DIR_DELETED) {
1225 exfat_err(sb, "abnormal access to deleted target dentry");
1226 goto out;
1227 }
1228
1229 exfat_update_parent_info(new_ei, new_parent_inode);
1230
1231 p_dir = &(new_ei->dir);
1232 new_entry = new_ei->entry;
1233 ep = exfat_get_dentry(sb, p_dir, new_entry, &new_bh, NULL);
1234 if (!ep)
1235 goto out;
1236
1237 new_entry_type = exfat_get_entry_type(ep);
1238 brelse(new_bh);
1239
1240 /* if new_inode exists, update ei */
1241 if (new_entry_type == TYPE_DIR) {
1242 struct exfat_chain new_clu;
1243
1244 new_clu.dir = new_ei->start_clu;
1245 new_clu.size =
1246 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(new_inode),
1247 sbi);
1248 new_clu.flags = new_ei->flags;
1249
1250 ret = exfat_check_dir_empty(sb, &new_clu);
1251 if (ret)
1252 goto out;
1253 }
1254 }
1255
1256 /* check the validity of directory name in the given new pathname */
1257 ret = exfat_resolve_path(new_parent_inode, new_path, &newdir,
1258 &uni_name);
1259 if (ret)
1260 goto out;
1261
1262 exfat_set_volume_dirty(sb);
1263
1264 if (olddir.dir == newdir.dir)
1265 ret = exfat_rename_file(new_parent_inode, &olddir, dentry,
1266 &uni_name, ei);
1267 else
1268 ret = exfat_move_file(new_parent_inode, &olddir, dentry,
1269 &newdir, &uni_name, ei);
1270
1271 if (!ret && new_inode) {
1272 /* delete entries of new_dir */
1273 ep = exfat_get_dentry(sb, p_dir, new_entry, &new_bh, NULL);
1274 if (!ep) {
1275 ret = -EIO;
1276 goto del_out;
1277 }
1278
1279 num_entries = exfat_count_ext_entries(sb, p_dir, new_entry, ep);
1280 if (num_entries < 0) {
1281 ret = -EIO;
1282 goto del_out;
1283 }
1284 brelse(new_bh);
1285
1286 if (exfat_remove_entries(new_inode, p_dir, new_entry, 0,
1287 num_entries + 1)) {
1288 ret = -EIO;
1289 goto del_out;
1290 }
1291
1292 /* Free the clusters if new_inode is a dir(as if exfat_rmdir) */
1293 if (new_entry_type == TYPE_DIR) {
1294 /* new_ei, new_clu_to_free */
1295 struct exfat_chain new_clu_to_free;
1296
1297 exfat_chain_set(&new_clu_to_free, new_ei->start_clu,
1298 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(new_inode),
1299 sbi), new_ei->flags);
1300
1301 if (exfat_free_cluster(new_inode, &new_clu_to_free)) {
1302 /* just set I/O error only */
1303 ret = -EIO;
1304 }
1305
1306 i_size_write(new_inode, 0);
1307 new_ei->start_clu = EXFAT_EOF_CLUSTER;
1308 new_ei->flags = ALLOC_NO_FAT_CHAIN;
1309 }
1310 del_out:
1311 /* Update new_inode ei
1312 * Prevent syncing removed new_inode
1313 * (new_ei is already initialized above code ("if (new_inode)")
1314 */
1315 new_ei->dir.dir = DIR_DELETED;
1316 }
1317 exfat_clear_volume_dirty(sb);
1318 out:
1319 return ret;
1320 }
1321
1322 static int exfat_rename(struct user_namespace *mnt_userns,
1323 struct inode *old_dir, struct dentry *old_dentry,
1324 struct inode *new_dir, struct dentry *new_dentry,
1325 unsigned int flags)
1326 {
1327 struct inode *old_inode, *new_inode;
1328 struct super_block *sb = old_dir->i_sb;
1329 loff_t i_pos;
1330 int err;
1331
1332 /*
1333 * The VFS already checks for existence, so for local filesystems
1334 * the RENAME_NOREPLACE implementation is equivalent to plain rename.
1335 * Don't support any other flags
1336 */
1337 if (flags & ~RENAME_NOREPLACE)
1338 return -EINVAL;
1339
1340 mutex_lock(&EXFAT_SB(sb)->s_lock);
1341 old_inode = old_dentry->d_inode;
1342 new_inode = new_dentry->d_inode;
1343
1344 err = __exfat_rename(old_dir, EXFAT_I(old_inode), new_dir, new_dentry);
1345 if (err)
1346 goto unlock;
1347
1348 inode_inc_iversion(new_dir);
1349 new_dir->i_ctime = new_dir->i_mtime = new_dir->i_atime =
1350 EXFAT_I(new_dir)->i_crtime = current_time(new_dir);
1351 exfat_truncate_atime(&new_dir->i_atime);
1352 if (IS_DIRSYNC(new_dir))
1353 exfat_sync_inode(new_dir);
1354 else
1355 mark_inode_dirty(new_dir);
1356
1357 i_pos = ((loff_t)EXFAT_I(old_inode)->dir.dir << 32) |
1358 (EXFAT_I(old_inode)->entry & 0xffffffff);
1359 exfat_unhash_inode(old_inode);
1360 exfat_hash_inode(old_inode, i_pos);
1361 if (IS_DIRSYNC(new_dir))
1362 exfat_sync_inode(old_inode);
1363 else
1364 mark_inode_dirty(old_inode);
1365
1366 if (S_ISDIR(old_inode->i_mode) && old_dir != new_dir) {
1367 drop_nlink(old_dir);
1368 if (!new_inode)
1369 inc_nlink(new_dir);
1370 }
1371
1372 inode_inc_iversion(old_dir);
1373 old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir);
1374 if (IS_DIRSYNC(old_dir))
1375 exfat_sync_inode(old_dir);
1376 else
1377 mark_inode_dirty(old_dir);
1378
1379 if (new_inode) {
1380 exfat_unhash_inode(new_inode);
1381
1382 /* skip drop_nlink if new_inode already has been dropped */
1383 if (new_inode->i_nlink) {
1384 drop_nlink(new_inode);
1385 if (S_ISDIR(new_inode->i_mode))
1386 drop_nlink(new_inode);
1387 } else {
1388 exfat_warn(sb, "abnormal access to an inode dropped");
1389 WARN_ON(new_inode->i_nlink == 0);
1390 }
1391 new_inode->i_ctime = EXFAT_I(new_inode)->i_crtime =
1392 current_time(new_inode);
1393 }
1394
1395 unlock:
1396 mutex_unlock(&EXFAT_SB(sb)->s_lock);
1397 return err;
1398 }
1399
1400 const struct inode_operations exfat_dir_inode_operations = {
1401 .create = exfat_create,
1402 .lookup = exfat_lookup,
1403 .unlink = exfat_unlink,
1404 .mkdir = exfat_mkdir,
1405 .rmdir = exfat_rmdir,
1406 .rename = exfat_rename,
1407 .setattr = exfat_setattr,
1408 .getattr = exfat_getattr,
1409 };
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