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