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
exfat_d_version(struct dentry * dentry)15 static inline unsigned long exfat_d_version(struct dentry *dentry)
16 {
17 return (unsigned long) dentry->d_fsdata;
18 }
19
exfat_d_version_set(struct dentry * dentry,unsigned long version)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 */
exfat_d_revalidate(struct inode * dir,const struct qstr * name,struct dentry * dentry,unsigned int flags)34 static int exfat_d_revalidate(struct inode *dir, const struct qstr *name,
35 struct dentry *dentry, unsigned int flags)
36 {
37 if (flags & LOOKUP_RCU)
38 return -ECHILD;
39
40 /*
41 * This is not negative dentry. Always valid.
42 *
43 * Note, rename() to existing directory entry will have ->d_inode, and
44 * will use existing name which isn't specified name by user.
45 *
46 * We may be able to drop this positive dentry here. But dropping
47 * positive dentry isn't good idea. So it's unsupported like
48 * rename("filename", "FILENAME") for now.
49 */
50 if (d_really_is_positive(dentry))
51 return 1;
52
53 /*
54 * Drop the negative dentry, in order to make sure to use the case
55 * sensitive name which is specified by user if this is for creation.
56 */
57 if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
58 return 0;
59
60 return inode_eq_iversion(dir, exfat_d_version(dentry));
61 }
62
63 /* returns the length of a struct qstr, ignoring trailing dots if necessary */
exfat_striptail_len(unsigned int len,const char * name,bool keep_last_dots)64 static unsigned int exfat_striptail_len(unsigned int len, const char *name,
65 bool keep_last_dots)
66 {
67 if (!keep_last_dots) {
68 while (len && name[len - 1] == '.')
69 len--;
70 }
71 return len;
72 }
73
74 /*
75 * Compute the hash for the exfat name corresponding to the dentry. If the name
76 * is invalid, we leave the hash code unchanged so that the existing dentry can
77 * be used. The exfat fs routines will return ENOENT or EINVAL as appropriate.
78 */
exfat_d_hash(const struct dentry * dentry,struct qstr * qstr)79 static int exfat_d_hash(const struct dentry *dentry, struct qstr *qstr)
80 {
81 struct super_block *sb = dentry->d_sb;
82 struct nls_table *t = EXFAT_SB(sb)->nls_io;
83 const unsigned char *name = qstr->name;
84 unsigned int len = exfat_striptail_len(qstr->len, qstr->name,
85 EXFAT_SB(sb)->options.keep_last_dots);
86 unsigned long hash = init_name_hash(dentry);
87 int i, charlen;
88 wchar_t c;
89
90 for (i = 0; i < len; i += charlen) {
91 charlen = t->char2uni(&name[i], len - i, &c);
92 if (charlen < 0)
93 return charlen;
94 hash = partial_name_hash(exfat_toupper(sb, c), hash);
95 }
96
97 qstr->hash = end_name_hash(hash);
98 return 0;
99 }
100
exfat_d_cmp(const struct dentry * dentry,unsigned int len,const char * str,const struct qstr * name)101 static int exfat_d_cmp(const struct dentry *dentry, unsigned int len,
102 const char *str, const struct qstr *name)
103 {
104 struct super_block *sb = dentry->d_sb;
105 struct nls_table *t = EXFAT_SB(sb)->nls_io;
106 unsigned int alen = exfat_striptail_len(name->len, name->name,
107 EXFAT_SB(sb)->options.keep_last_dots);
108 unsigned int blen = exfat_striptail_len(len, str,
109 EXFAT_SB(sb)->options.keep_last_dots);
110 wchar_t c1, c2;
111 int charlen, i;
112
113 if (alen != blen)
114 return 1;
115
116 for (i = 0; i < len; i += charlen) {
117 charlen = t->char2uni(&name->name[i], alen - i, &c1);
118 if (charlen < 0)
119 return 1;
120 if (charlen != t->char2uni(&str[i], blen - i, &c2))
121 return 1;
122
123 if (exfat_toupper(sb, c1) != exfat_toupper(sb, c2))
124 return 1;
125 }
126
127 return 0;
128 }
129
130 const struct dentry_operations exfat_dentry_ops = {
131 .d_revalidate = exfat_d_revalidate,
132 .d_hash = exfat_d_hash,
133 .d_compare = exfat_d_cmp,
134 };
135
exfat_utf8_d_hash(const struct dentry * dentry,struct qstr * qstr)136 static int exfat_utf8_d_hash(const struct dentry *dentry, struct qstr *qstr)
137 {
138 struct super_block *sb = dentry->d_sb;
139 const unsigned char *name = qstr->name;
140 unsigned int len = exfat_striptail_len(qstr->len, qstr->name,
141 EXFAT_SB(sb)->options.keep_last_dots);
142 unsigned long hash = init_name_hash(dentry);
143 int i, charlen;
144 unicode_t u;
145
146 for (i = 0; i < len; i += charlen) {
147 charlen = utf8_to_utf32(&name[i], len - i, &u);
148 if (charlen < 0)
149 return charlen;
150
151 /*
152 * exfat_toupper() works only for code points up to the U+FFFF.
153 */
154 hash = partial_name_hash(u <= 0xFFFF ? exfat_toupper(sb, u) : u,
155 hash);
156 }
157
158 qstr->hash = end_name_hash(hash);
159 return 0;
160 }
161
exfat_utf8_d_cmp(const struct dentry * dentry,unsigned int len,const char * str,const struct qstr * name)162 static int exfat_utf8_d_cmp(const struct dentry *dentry, unsigned int len,
163 const char *str, const struct qstr *name)
164 {
165 struct super_block *sb = dentry->d_sb;
166 unsigned int alen = exfat_striptail_len(name->len, name->name,
167 EXFAT_SB(sb)->options.keep_last_dots);
168 unsigned int blen = exfat_striptail_len(len, str,
169 EXFAT_SB(sb)->options.keep_last_dots);
170
171 unicode_t u_a, u_b;
172 int charlen, i;
173
174 if (alen != blen)
175 return 1;
176
177 for (i = 0; i < alen; i += charlen) {
178 charlen = utf8_to_utf32(&name->name[i], alen - i, &u_a);
179 if (charlen < 0)
180 return 1;
181 if (charlen != utf8_to_utf32(&str[i], blen - i, &u_b))
182 return 1;
183
184 if (u_a <= 0xFFFF && u_b <= 0xFFFF) {
185 if (exfat_toupper(sb, u_a) != exfat_toupper(sb, u_b))
186 return 1;
187 } else {
188 if (u_a != u_b)
189 return 1;
190 }
191 }
192
193 return 0;
194 }
195
196 const struct dentry_operations exfat_utf8_dentry_ops = {
197 .d_revalidate = exfat_d_revalidate,
198 .d_hash = exfat_utf8_d_hash,
199 .d_compare = exfat_utf8_d_cmp,
200 };
201
202 /* search EMPTY CONTINUOUS "num_entries" entries */
exfat_search_empty_slot(struct super_block * sb,struct exfat_hint_femp * hint_femp,struct exfat_chain * p_dir,int num_entries,struct exfat_entry_set_cache * es)203 static int exfat_search_empty_slot(struct super_block *sb,
204 struct exfat_hint_femp *hint_femp, struct exfat_chain *p_dir,
205 int num_entries, struct exfat_entry_set_cache *es)
206 {
207 int i, dentry, ret;
208 int dentries_per_clu;
209 struct exfat_chain clu;
210 struct exfat_sb_info *sbi = EXFAT_SB(sb);
211 int total_entries = EXFAT_CLU_TO_DEN(p_dir->size, sbi);
212
213 dentries_per_clu = sbi->dentries_per_clu;
214
215 if (hint_femp->eidx != EXFAT_HINT_NONE) {
216 dentry = hint_femp->eidx;
217
218 /*
219 * If hint_femp->count is enough, it is needed to check if
220 * there are actual empty entries.
221 * Otherwise, and if "dentry + hint_famp->count" is also equal
222 * to "p_dir->size * dentries_per_clu", it means ENOSPC.
223 */
224 if (dentry + hint_femp->count == total_entries &&
225 num_entries > hint_femp->count)
226 return -ENOSPC;
227
228 hint_femp->eidx = EXFAT_HINT_NONE;
229 exfat_chain_dup(&clu, &hint_femp->cur);
230 } else {
231 exfat_chain_dup(&clu, p_dir);
232 dentry = 0;
233 }
234
235 while (dentry + num_entries <= total_entries &&
236 clu.dir != EXFAT_EOF_CLUSTER) {
237 i = dentry & (dentries_per_clu - 1);
238
239 ret = exfat_get_empty_dentry_set(es, sb, &clu, i, num_entries);
240 if (ret < 0)
241 return ret;
242 else if (ret == 0)
243 return dentry;
244
245 dentry += ret;
246 i += ret;
247
248 while (i >= dentries_per_clu) {
249 if (clu.flags == ALLOC_NO_FAT_CHAIN) {
250 if (--clu.size > 0)
251 clu.dir++;
252 else
253 clu.dir = EXFAT_EOF_CLUSTER;
254 } else {
255 if (exfat_get_next_cluster(sb, &clu.dir))
256 return -EIO;
257 }
258
259 i -= dentries_per_clu;
260 }
261 }
262
263 hint_femp->eidx = dentry;
264 hint_femp->count = 0;
265 if (dentry == total_entries || clu.dir == EXFAT_EOF_CLUSTER)
266 exfat_chain_set(&hint_femp->cur, EXFAT_EOF_CLUSTER, 0,
267 clu.flags);
268 else
269 hint_femp->cur = clu;
270
271 return -ENOSPC;
272 }
273
exfat_check_max_dentries(struct inode * inode)274 static int exfat_check_max_dentries(struct inode *inode)
275 {
276 if (EXFAT_B_TO_DEN(i_size_read(inode)) >= MAX_EXFAT_DENTRIES) {
277 /*
278 * exFAT spec allows a dir to grow up to 8388608(256MB)
279 * dentries
280 */
281 return -ENOSPC;
282 }
283 return 0;
284 }
285
286 /*
287 * Find an empty directory entry set.
288 *
289 * If there isn't any empty slot, expand cluster chain.
290 *
291 * in:
292 * inode: inode of the parent directory
293 * num_entries: specifies how many dentries in the empty directory entry set
294 *
295 * out:
296 * p_dir: the cluster where the empty directory entry set is located
297 * es: The found empty directory entry set
298 *
299 * return:
300 * the directory entry index in p_dir is returned on succeeds
301 * -error code is returned on failure
302 */
exfat_find_empty_entry(struct inode * inode,struct exfat_chain * p_dir,int num_entries,struct exfat_entry_set_cache * es)303 int exfat_find_empty_entry(struct inode *inode,
304 struct exfat_chain *p_dir, int num_entries,
305 struct exfat_entry_set_cache *es)
306 {
307 int dentry;
308 unsigned int ret, last_clu;
309 loff_t size = 0;
310 struct exfat_chain clu;
311 struct super_block *sb = inode->i_sb;
312 struct exfat_sb_info *sbi = EXFAT_SB(sb);
313 struct exfat_inode_info *ei = EXFAT_I(inode);
314 struct exfat_hint_femp hint_femp;
315
316 hint_femp.eidx = EXFAT_HINT_NONE;
317
318 if (ei->hint_femp.eidx != EXFAT_HINT_NONE) {
319 hint_femp = ei->hint_femp;
320 ei->hint_femp.eidx = EXFAT_HINT_NONE;
321 }
322
323 exfat_chain_set(p_dir, ei->start_clu,
324 EXFAT_B_TO_CLU(i_size_read(inode), sbi), ei->flags);
325
326 while ((dentry = exfat_search_empty_slot(sb, &hint_femp, p_dir,
327 num_entries, es)) < 0) {
328 if (dentry != -ENOSPC)
329 return dentry;
330
331 if (exfat_check_max_dentries(inode))
332 return -ENOSPC;
333
334 /*
335 * Allocate new cluster to this directory
336 */
337 if (ei->start_clu != EXFAT_EOF_CLUSTER) {
338 /* we trust p_dir->size regardless of FAT type */
339 if (exfat_find_last_cluster(sb, p_dir, &last_clu))
340 return -EIO;
341
342 exfat_chain_set(&clu, last_clu + 1, 0, p_dir->flags);
343 } else {
344 /* This directory is empty */
345 exfat_chain_set(&clu, EXFAT_EOF_CLUSTER, 0,
346 ALLOC_NO_FAT_CHAIN);
347 }
348
349 /* allocate a cluster */
350 ret = exfat_alloc_cluster(inode, 1, &clu, IS_DIRSYNC(inode));
351 if (ret)
352 return ret;
353
354 if (exfat_zeroed_cluster(inode, clu.dir))
355 return -EIO;
356
357 if (ei->start_clu == EXFAT_EOF_CLUSTER) {
358 ei->start_clu = clu.dir;
359 p_dir->dir = clu.dir;
360 hint_femp.eidx = 0;
361 }
362
363 /* append to the FAT chain */
364 if (clu.flags != p_dir->flags) {
365 /* no-fat-chain bit is disabled,
366 * so fat-chain should be synced with alloc-bitmap
367 */
368 exfat_chain_cont_cluster(sb, p_dir->dir, p_dir->size);
369 p_dir->flags = ALLOC_FAT_CHAIN;
370 hint_femp.cur.flags = ALLOC_FAT_CHAIN;
371 }
372
373 if (clu.flags == ALLOC_FAT_CHAIN)
374 if (exfat_ent_set(sb, last_clu, clu.dir))
375 return -EIO;
376
377 if (hint_femp.cur.dir == EXFAT_EOF_CLUSTER)
378 exfat_chain_set(&hint_femp.cur, clu.dir, 0, clu.flags);
379
380 hint_femp.count += sbi->dentries_per_clu;
381
382 hint_femp.cur.size++;
383 p_dir->size++;
384 size = EXFAT_CLU_TO_B(p_dir->size, sbi);
385
386 /* directory inode should be updated in here */
387 i_size_write(inode, size);
388 ei->valid_size += sbi->cluster_size;
389 ei->flags = p_dir->flags;
390 inode->i_blocks += sbi->cluster_size >> 9;
391 }
392
393 p_dir->dir = exfat_sector_to_cluster(sbi, es->bh[0]->b_blocknr);
394 p_dir->size -= dentry / sbi->dentries_per_clu;
395
396 return dentry & (sbi->dentries_per_clu - 1);
397 }
398
399 /*
400 * Name Resolution Functions :
401 * Zero if it was successful; otherwise nonzero.
402 */
__exfat_resolve_path(struct inode * inode,const unsigned char * path,struct exfat_uni_name * p_uniname,int lookup)403 static int __exfat_resolve_path(struct inode *inode, const unsigned char *path,
404 struct exfat_uni_name *p_uniname, int lookup)
405 {
406 int namelen;
407 int lossy = NLS_NAME_NO_LOSSY;
408 struct super_block *sb = inode->i_sb;
409 int pathlen = strlen(path);
410
411 /*
412 * get the length of the pathname excluding
413 * trailing periods, if any.
414 */
415 namelen = exfat_striptail_len(pathlen, path, false);
416 if (EXFAT_SB(sb)->options.keep_last_dots) {
417 /*
418 * Do not allow the creation of files with names
419 * ending with period(s).
420 */
421 if (!lookup && (namelen < pathlen))
422 return -EINVAL;
423 namelen = pathlen;
424 }
425 if (!namelen)
426 return -ENOENT;
427 if (pathlen > (MAX_NAME_LENGTH * MAX_CHARSET_SIZE))
428 return -ENAMETOOLONG;
429
430 /*
431 * strip all leading spaces :
432 * "MS windows 7" supports leading spaces.
433 * So we should skip this preprocessing for compatibility.
434 */
435
436 /* file name conversion :
437 * If lookup case, we allow bad-name for compatibility.
438 */
439 namelen = exfat_nls_to_utf16(sb, path, namelen, p_uniname,
440 &lossy);
441 if (namelen < 0)
442 return namelen; /* return error value */
443
444 if ((lossy && !lookup) || !namelen)
445 return -EINVAL;
446
447 return 0;
448 }
449
exfat_resolve_path(struct inode * inode,const unsigned char * path,struct exfat_uni_name * uni)450 static inline int exfat_resolve_path(struct inode *inode,
451 const unsigned char *path, struct exfat_uni_name *uni)
452 {
453 return __exfat_resolve_path(inode, path, uni, 0);
454 }
455
exfat_resolve_path_for_lookup(struct inode * inode,const unsigned char * path,struct exfat_uni_name * uni)456 static inline int exfat_resolve_path_for_lookup(struct inode *inode,
457 const unsigned char *path, struct exfat_uni_name *uni)
458 {
459 return __exfat_resolve_path(inode, path, uni, 1);
460 }
461
exfat_make_i_pos(struct exfat_dir_entry * info)462 static inline loff_t exfat_make_i_pos(struct exfat_dir_entry *info)
463 {
464 return ((loff_t) info->dir.dir << 32) | (info->entry & 0xffffffff);
465 }
466
exfat_add_entry(struct inode * inode,const char * path,unsigned int type,struct exfat_dir_entry * info)467 static int exfat_add_entry(struct inode *inode, const char *path,
468 unsigned int type, struct exfat_dir_entry *info)
469 {
470 int ret, dentry, num_entries;
471 struct super_block *sb = inode->i_sb;
472 struct exfat_sb_info *sbi = EXFAT_SB(sb);
473 struct exfat_uni_name uniname;
474 struct exfat_chain clu;
475 struct timespec64 ts = current_time(inode);
476 struct exfat_entry_set_cache es;
477 int clu_size = 0;
478 unsigned int start_clu = EXFAT_FREE_CLUSTER;
479
480 ret = exfat_resolve_path(inode, path, &uniname);
481 if (ret)
482 goto out;
483
484 num_entries = exfat_calc_num_entries(&uniname);
485 if (num_entries < 0) {
486 ret = num_entries;
487 goto out;
488 }
489
490 /* exfat_find_empty_entry must be called before alloc_cluster() */
491 dentry = exfat_find_empty_entry(inode, &info->dir, num_entries, &es);
492 if (dentry < 0) {
493 ret = dentry; /* -EIO or -ENOSPC */
494 goto out;
495 }
496
497 if (type == TYPE_DIR && !sbi->options.zero_size_dir) {
498 ret = exfat_alloc_new_dir(inode, &clu);
499 if (ret) {
500 exfat_put_dentry_set(&es, false);
501 goto out;
502 }
503 start_clu = clu.dir;
504 clu_size = sbi->cluster_size;
505 }
506
507 /* update the directory entry */
508 /* fill the dos name directory entry information of the created file.
509 * the first cluster is not determined yet. (0)
510 */
511 exfat_init_dir_entry(&es, type, start_clu, clu_size, &ts);
512 exfat_init_ext_entry(&es, num_entries, &uniname);
513
514 ret = exfat_put_dentry_set(&es, IS_DIRSYNC(inode));
515 if (ret)
516 goto out;
517
518 info->entry = dentry;
519 info->flags = ALLOC_NO_FAT_CHAIN;
520 info->type = type;
521
522 if (type == TYPE_FILE) {
523 info->attr = EXFAT_ATTR_ARCHIVE;
524 info->start_clu = EXFAT_EOF_CLUSTER;
525 info->size = 0;
526 info->num_subdirs = 0;
527 } else {
528 info->attr = EXFAT_ATTR_SUBDIR;
529 if (sbi->options.zero_size_dir)
530 info->start_clu = EXFAT_EOF_CLUSTER;
531 else
532 info->start_clu = start_clu;
533 info->size = clu_size;
534 info->num_subdirs = EXFAT_MIN_SUBDIR;
535 }
536 info->valid_size = info->size;
537
538 memset(&info->crtime, 0, sizeof(info->crtime));
539 memset(&info->mtime, 0, sizeof(info->mtime));
540 memset(&info->atime, 0, sizeof(info->atime));
541 out:
542 return ret;
543 }
544
exfat_create(struct mnt_idmap * idmap,struct inode * dir,struct dentry * dentry,umode_t mode,bool excl)545 static int exfat_create(struct mnt_idmap *idmap, struct inode *dir,
546 struct dentry *dentry, umode_t mode, bool excl)
547 {
548 struct super_block *sb = dir->i_sb;
549 struct inode *inode;
550 struct exfat_dir_entry info;
551 loff_t i_pos;
552 int err;
553 loff_t size = i_size_read(dir);
554
555 if (unlikely(exfat_forced_shutdown(sb)))
556 return -EIO;
557
558 mutex_lock(&EXFAT_SB(sb)->s_lock);
559 exfat_set_volume_dirty(sb);
560 err = exfat_add_entry(dir, dentry->d_name.name, TYPE_FILE, &info);
561 if (err)
562 goto unlock;
563
564 inode_inc_iversion(dir);
565 inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
566 if (IS_DIRSYNC(dir) && size != i_size_read(dir))
567 exfat_sync_inode(dir);
568 else
569 mark_inode_dirty(dir);
570
571 i_pos = exfat_make_i_pos(&info);
572 inode = exfat_build_inode(sb, &info, i_pos);
573 err = PTR_ERR_OR_ZERO(inode);
574 if (err)
575 goto unlock;
576
577 inode_inc_iversion(inode);
578 EXFAT_I(inode)->i_crtime = simple_inode_init_ts(inode);
579 exfat_truncate_inode_atime(inode);
580
581 /* timestamp is already written, so mark_inode_dirty() is unneeded. */
582
583 d_instantiate(dentry, inode);
584 unlock:
585 mutex_unlock(&EXFAT_SB(sb)->s_lock);
586 return err;
587 }
588
589 /* lookup a file */
exfat_find(struct inode * dir,const struct qstr * qname,struct exfat_dir_entry * info)590 static int exfat_find(struct inode *dir, const struct qstr *qname,
591 struct exfat_dir_entry *info)
592 {
593 int ret, dentry, count;
594 struct exfat_chain cdir;
595 struct exfat_uni_name uni_name;
596 struct super_block *sb = dir->i_sb;
597 struct exfat_sb_info *sbi = EXFAT_SB(sb);
598 struct exfat_inode_info *ei = EXFAT_I(dir);
599 struct exfat_dentry *ep, *ep2;
600 struct exfat_entry_set_cache es;
601 /* for optimized dir & entry to prevent long traverse of cluster chain */
602 struct exfat_hint hint_opt;
603
604 if (qname->len == 0)
605 return -ENOENT;
606
607 /* check the validity of directory name in the given pathname */
608 ret = exfat_resolve_path_for_lookup(dir, qname->name, &uni_name);
609 if (ret)
610 return ret;
611
612 exfat_chain_set(&cdir, ei->start_clu,
613 EXFAT_B_TO_CLU(i_size_read(dir), sbi), ei->flags);
614
615 /* check the validation of hint_stat and initialize it if required */
616 if (ei->version != (inode_peek_iversion_raw(dir) & 0xffffffff)) {
617 ei->hint_stat.clu = cdir.dir;
618 ei->hint_stat.eidx = 0;
619 ei->version = (inode_peek_iversion_raw(dir) & 0xffffffff);
620 ei->hint_femp.eidx = EXFAT_HINT_NONE;
621 }
622
623 /* search the file name for directories */
624 dentry = exfat_find_dir_entry(sb, ei, &cdir, &uni_name, &hint_opt);
625 if (dentry < 0)
626 return dentry; /* -error value */
627
628 /* adjust cdir to the optimized value */
629 cdir.dir = hint_opt.clu;
630 if (cdir.flags & ALLOC_NO_FAT_CHAIN)
631 cdir.size -= dentry / sbi->dentries_per_clu;
632 dentry = hint_opt.eidx;
633
634 info->dir = cdir;
635 info->entry = dentry;
636 info->num_subdirs = 0;
637
638 if (exfat_get_dentry_set(&es, sb, &cdir, dentry, ES_2_ENTRIES))
639 return -EIO;
640 ep = exfat_get_dentry_cached(&es, ES_IDX_FILE);
641 ep2 = exfat_get_dentry_cached(&es, ES_IDX_STREAM);
642
643 info->type = exfat_get_entry_type(ep);
644 info->attr = le16_to_cpu(ep->dentry.file.attr);
645 info->valid_size = le64_to_cpu(ep2->dentry.stream.valid_size);
646 info->size = le64_to_cpu(ep2->dentry.stream.size);
647
648 if (info->valid_size < 0) {
649 exfat_fs_error(sb, "data valid size is invalid(%lld)", info->valid_size);
650 return -EIO;
651 }
652
653 if (unlikely(EXFAT_B_TO_CLU_ROUND_UP(info->size, sbi) > sbi->used_clusters)) {
654 exfat_fs_error(sb, "data size is invalid(%lld)", info->size);
655 return -EIO;
656 }
657
658 info->start_clu = le32_to_cpu(ep2->dentry.stream.start_clu);
659 if (!is_valid_cluster(sbi, info->start_clu) && info->size) {
660 exfat_warn(sb, "start_clu is invalid cluster(0x%x)",
661 info->start_clu);
662 info->size = 0;
663 info->valid_size = 0;
664 }
665
666 if (info->valid_size > info->size) {
667 exfat_warn(sb, "valid_size(%lld) is greater than size(%lld)",
668 info->valid_size, info->size);
669 info->valid_size = info->size;
670 }
671
672 if (info->size == 0) {
673 info->flags = ALLOC_NO_FAT_CHAIN;
674 info->start_clu = EXFAT_EOF_CLUSTER;
675 } else
676 info->flags = ep2->dentry.stream.flags;
677
678 exfat_get_entry_time(sbi, &info->crtime,
679 ep->dentry.file.create_tz,
680 ep->dentry.file.create_time,
681 ep->dentry.file.create_date,
682 ep->dentry.file.create_time_cs);
683 exfat_get_entry_time(sbi, &info->mtime,
684 ep->dentry.file.modify_tz,
685 ep->dentry.file.modify_time,
686 ep->dentry.file.modify_date,
687 ep->dentry.file.modify_time_cs);
688 exfat_get_entry_time(sbi, &info->atime,
689 ep->dentry.file.access_tz,
690 ep->dentry.file.access_time,
691 ep->dentry.file.access_date,
692 0);
693 exfat_put_dentry_set(&es, false);
694
695 if (ei->start_clu == EXFAT_FREE_CLUSTER) {
696 exfat_fs_error(sb,
697 "non-zero size file starts with zero cluster (size : %llu, p_dir : %u, entry : 0x%08x)",
698 i_size_read(dir), ei->dir.dir, ei->entry);
699 return -EIO;
700 }
701
702 if (info->type == TYPE_DIR) {
703 exfat_chain_set(&cdir, info->start_clu,
704 EXFAT_B_TO_CLU(info->size, sbi), info->flags);
705 count = exfat_count_dir_entries(sb, &cdir);
706 if (count < 0)
707 return -EIO;
708
709 info->num_subdirs = count + EXFAT_MIN_SUBDIR;
710 }
711 return 0;
712 }
713
exfat_d_anon_disconn(struct dentry * dentry)714 static int exfat_d_anon_disconn(struct dentry *dentry)
715 {
716 return IS_ROOT(dentry) && (dentry->d_flags & DCACHE_DISCONNECTED);
717 }
718
exfat_lookup(struct inode * dir,struct dentry * dentry,unsigned int flags)719 static struct dentry *exfat_lookup(struct inode *dir, struct dentry *dentry,
720 unsigned int flags)
721 {
722 struct super_block *sb = dir->i_sb;
723 struct inode *inode;
724 struct dentry *alias;
725 struct exfat_dir_entry info;
726 int err;
727 loff_t i_pos;
728 mode_t i_mode;
729
730 mutex_lock(&EXFAT_SB(sb)->s_lock);
731 err = exfat_find(dir, &dentry->d_name, &info);
732 if (err) {
733 if (err == -ENOENT) {
734 inode = NULL;
735 goto out;
736 }
737 goto unlock;
738 }
739
740 i_pos = exfat_make_i_pos(&info);
741 inode = exfat_build_inode(sb, &info, i_pos);
742 err = PTR_ERR_OR_ZERO(inode);
743 if (err)
744 goto unlock;
745
746 i_mode = inode->i_mode;
747 alias = d_find_alias(inode);
748
749 /*
750 * Checking "alias->d_parent == dentry->d_parent" to make sure
751 * FS is not corrupted (especially double linked dir).
752 */
753 if (alias && alias->d_parent == dentry->d_parent &&
754 !exfat_d_anon_disconn(alias)) {
755
756 /*
757 * Unhashed alias is able to exist because of revalidate()
758 * called by lookup_fast. You can easily make this status
759 * by calling create and lookup concurrently
760 * In such case, we reuse an alias instead of new dentry
761 */
762 if (d_unhashed(alias)) {
763 WARN_ON(alias->d_name.hash_len !=
764 dentry->d_name.hash_len);
765 exfat_info(sb, "rehashed a dentry(%p) in read lookup",
766 alias);
767 d_drop(dentry);
768 d_rehash(alias);
769 } else if (!S_ISDIR(i_mode)) {
770 /*
771 * This inode has non anonymous-DCACHE_DISCONNECTED
772 * dentry. This means, the user did ->lookup() by an
773 * another name (longname vs 8.3 alias of it) in past.
774 *
775 * Switch to new one for reason of locality if possible.
776 */
777 d_move(alias, dentry);
778 }
779 iput(inode);
780 mutex_unlock(&EXFAT_SB(sb)->s_lock);
781 return alias;
782 }
783 dput(alias);
784 out:
785 mutex_unlock(&EXFAT_SB(sb)->s_lock);
786 if (!inode)
787 exfat_d_version_set(dentry, inode_query_iversion(dir));
788
789 return d_splice_alias(inode, dentry);
790 unlock:
791 mutex_unlock(&EXFAT_SB(sb)->s_lock);
792 return ERR_PTR(err);
793 }
794
795 /* remove an entry, BUT don't truncate */
exfat_unlink(struct inode * dir,struct dentry * dentry)796 static int exfat_unlink(struct inode *dir, struct dentry *dentry)
797 {
798 struct super_block *sb = dir->i_sb;
799 struct inode *inode = dentry->d_inode;
800 struct exfat_inode_info *ei = EXFAT_I(inode);
801 struct exfat_entry_set_cache es;
802 int err = 0;
803
804 if (unlikely(exfat_forced_shutdown(sb)))
805 return -EIO;
806
807 mutex_lock(&EXFAT_SB(sb)->s_lock);
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 err = exfat_get_dentry_set_by_ei(&es, sb, ei);
815 if (err) {
816 err = -EIO;
817 goto unlock;
818 }
819
820 exfat_set_volume_dirty(sb);
821
822 /* update the directory entry */
823 exfat_remove_entries(inode, &es, ES_IDX_FILE);
824
825 err = exfat_put_dentry_set(&es, IS_DIRSYNC(inode));
826 if (err)
827 goto unlock;
828
829 /* This doesn't modify ei */
830 ei->dir.dir = DIR_DELETED;
831
832 inode_inc_iversion(dir);
833 simple_inode_init_ts(dir);
834 exfat_truncate_inode_atime(dir);
835 mark_inode_dirty(dir);
836
837 clear_nlink(inode);
838 simple_inode_init_ts(inode);
839 exfat_truncate_inode_atime(inode);
840 exfat_unhash_inode(inode);
841 exfat_d_version_set(dentry, inode_query_iversion(dir));
842 unlock:
843 mutex_unlock(&EXFAT_SB(sb)->s_lock);
844 return err;
845 }
846
exfat_mkdir(struct mnt_idmap * idmap,struct inode * dir,struct dentry * dentry,umode_t mode)847 static struct dentry *exfat_mkdir(struct mnt_idmap *idmap, struct inode *dir,
848 struct dentry *dentry, umode_t mode)
849 {
850 struct super_block *sb = dir->i_sb;
851 struct inode *inode;
852 struct exfat_dir_entry info;
853 loff_t i_pos;
854 int err;
855 loff_t size = i_size_read(dir);
856
857 if (unlikely(exfat_forced_shutdown(sb)))
858 return ERR_PTR(-EIO);
859
860 mutex_lock(&EXFAT_SB(sb)->s_lock);
861 exfat_set_volume_dirty(sb);
862 err = exfat_add_entry(dir, dentry->d_name.name, TYPE_DIR, &info);
863 if (err)
864 goto unlock;
865
866 inode_inc_iversion(dir);
867 inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
868 if (IS_DIRSYNC(dir) && size != i_size_read(dir))
869 exfat_sync_inode(dir);
870 else
871 mark_inode_dirty(dir);
872 inc_nlink(dir);
873
874 i_pos = exfat_make_i_pos(&info);
875 inode = exfat_build_inode(sb, &info, i_pos);
876 err = PTR_ERR_OR_ZERO(inode);
877 if (err)
878 goto unlock;
879
880 inode_inc_iversion(inode);
881 EXFAT_I(inode)->i_crtime = simple_inode_init_ts(inode);
882 exfat_truncate_inode_atime(inode);
883 /* timestamp is already written, so mark_inode_dirty() is unneeded. */
884
885 d_instantiate(dentry, inode);
886
887 unlock:
888 mutex_unlock(&EXFAT_SB(sb)->s_lock);
889 return ERR_PTR(err);
890 }
891
exfat_check_dir_empty(struct super_block * sb,struct exfat_chain * p_dir)892 static int exfat_check_dir_empty(struct super_block *sb,
893 struct exfat_chain *p_dir)
894 {
895 int i, dentries_per_clu;
896 unsigned int type;
897 unsigned int clu_count = 0;
898 struct exfat_chain clu;
899 struct exfat_dentry *ep;
900 struct exfat_sb_info *sbi = EXFAT_SB(sb);
901 struct buffer_head *bh;
902
903 dentries_per_clu = sbi->dentries_per_clu;
904
905 if (p_dir->dir == EXFAT_EOF_CLUSTER)
906 return 0;
907
908 exfat_chain_dup(&clu, p_dir);
909
910 while (clu.dir != EXFAT_EOF_CLUSTER) {
911 for (i = 0; i < dentries_per_clu; i++) {
912 ep = exfat_get_dentry(sb, &clu, i, &bh);
913 if (!ep)
914 return -EIO;
915 type = exfat_get_entry_type(ep);
916 brelse(bh);
917 if (type == TYPE_UNUSED)
918 return 0;
919
920 if (type != TYPE_FILE && type != TYPE_DIR)
921 continue;
922
923 return -ENOTEMPTY;
924 }
925
926 if (clu.flags == ALLOC_NO_FAT_CHAIN) {
927 if (--clu.size > 0)
928 clu.dir++;
929 else
930 clu.dir = EXFAT_EOF_CLUSTER;
931 } else {
932 if (exfat_get_next_cluster(sb, &(clu.dir)))
933 return -EIO;
934
935 /* break if the cluster chain includes a loop */
936 if (unlikely(++clu_count > EXFAT_DATA_CLUSTER_COUNT(sbi)))
937 break;
938 }
939 }
940
941 return 0;
942 }
943
exfat_rmdir(struct inode * dir,struct dentry * dentry)944 static int exfat_rmdir(struct inode *dir, struct dentry *dentry)
945 {
946 struct inode *inode = dentry->d_inode;
947 struct exfat_chain clu_to_free;
948 struct super_block *sb = inode->i_sb;
949 struct exfat_sb_info *sbi = EXFAT_SB(sb);
950 struct exfat_inode_info *ei = EXFAT_I(inode);
951 struct exfat_entry_set_cache es;
952 int err;
953
954 if (unlikely(exfat_forced_shutdown(sb)))
955 return -EIO;
956
957 mutex_lock(&EXFAT_SB(inode->i_sb)->s_lock);
958
959 if (ei->dir.dir == DIR_DELETED) {
960 exfat_err(sb, "abnormal access to deleted dentry");
961 err = -ENOENT;
962 goto unlock;
963 }
964
965 exfat_chain_set(&clu_to_free, ei->start_clu,
966 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(inode), sbi), ei->flags);
967
968 err = exfat_check_dir_empty(sb, &clu_to_free);
969 if (err) {
970 if (err == -EIO)
971 exfat_err(sb, "failed to exfat_check_dir_empty : err(%d)",
972 err);
973 goto unlock;
974 }
975
976 err = exfat_get_dentry_set_by_ei(&es, sb, ei);
977 if (err) {
978 err = -EIO;
979 goto unlock;
980 }
981
982 exfat_set_volume_dirty(sb);
983
984 exfat_remove_entries(inode, &es, ES_IDX_FILE);
985
986 err = exfat_put_dentry_set(&es, IS_DIRSYNC(dir));
987 if (err)
988 goto unlock;
989
990 ei->dir.dir = DIR_DELETED;
991
992 inode_inc_iversion(dir);
993 simple_inode_init_ts(dir);
994 exfat_truncate_inode_atime(dir);
995 if (IS_DIRSYNC(dir))
996 exfat_sync_inode(dir);
997 else
998 mark_inode_dirty(dir);
999 drop_nlink(dir);
1000
1001 clear_nlink(inode);
1002 simple_inode_init_ts(inode);
1003 exfat_truncate_inode_atime(inode);
1004 exfat_unhash_inode(inode);
1005 exfat_d_version_set(dentry, inode_query_iversion(dir));
1006 unlock:
1007 mutex_unlock(&EXFAT_SB(inode->i_sb)->s_lock);
1008 return err;
1009 }
1010
exfat_rename_file(struct inode * parent_inode,struct exfat_uni_name * p_uniname,struct exfat_inode_info * ei)1011 static int exfat_rename_file(struct inode *parent_inode,
1012 struct exfat_uni_name *p_uniname, struct exfat_inode_info *ei)
1013 {
1014 int ret, num_new_entries;
1015 struct exfat_dentry *epold, *epnew;
1016 struct super_block *sb = parent_inode->i_sb;
1017 struct exfat_entry_set_cache old_es, new_es;
1018 int sync = IS_DIRSYNC(parent_inode);
1019
1020 if (unlikely(exfat_forced_shutdown(sb)))
1021 return -EIO;
1022
1023 num_new_entries = exfat_calc_num_entries(p_uniname);
1024 if (num_new_entries < 0)
1025 return num_new_entries;
1026
1027 ret = exfat_get_dentry_set_by_ei(&old_es, sb, ei);
1028 if (ret) {
1029 ret = -EIO;
1030 return ret;
1031 }
1032
1033 epold = exfat_get_dentry_cached(&old_es, ES_IDX_FILE);
1034
1035 if (old_es.num_entries < num_new_entries) {
1036 int newentry;
1037 struct exfat_chain dir;
1038
1039 newentry = exfat_find_empty_entry(parent_inode, &dir,
1040 num_new_entries, &new_es);
1041 if (newentry < 0) {
1042 ret = newentry; /* -EIO or -ENOSPC */
1043 goto put_old_es;
1044 }
1045
1046 epnew = exfat_get_dentry_cached(&new_es, ES_IDX_FILE);
1047 *epnew = *epold;
1048 if (exfat_get_entry_type(epnew) == TYPE_FILE) {
1049 epnew->dentry.file.attr |= cpu_to_le16(EXFAT_ATTR_ARCHIVE);
1050 ei->attr |= EXFAT_ATTR_ARCHIVE;
1051 }
1052
1053 epold = exfat_get_dentry_cached(&old_es, ES_IDX_STREAM);
1054 epnew = exfat_get_dentry_cached(&new_es, ES_IDX_STREAM);
1055 *epnew = *epold;
1056
1057 exfat_init_ext_entry(&new_es, num_new_entries, p_uniname);
1058
1059 ret = exfat_put_dentry_set(&new_es, sync);
1060 if (ret)
1061 goto put_old_es;
1062
1063 exfat_remove_entries(parent_inode, &old_es, ES_IDX_FILE);
1064 ei->dir = dir;
1065 ei->entry = newentry;
1066 } else {
1067 if (exfat_get_entry_type(epold) == TYPE_FILE) {
1068 epold->dentry.file.attr |= cpu_to_le16(EXFAT_ATTR_ARCHIVE);
1069 ei->attr |= EXFAT_ATTR_ARCHIVE;
1070 }
1071
1072 exfat_remove_entries(parent_inode, &old_es, ES_IDX_FIRST_FILENAME + 1);
1073 exfat_init_ext_entry(&old_es, num_new_entries, p_uniname);
1074 }
1075 return exfat_put_dentry_set(&old_es, sync);
1076
1077 put_old_es:
1078 exfat_put_dentry_set(&old_es, false);
1079 return ret;
1080 }
1081
exfat_move_file(struct inode * parent_inode,struct exfat_uni_name * p_uniname,struct exfat_inode_info * ei)1082 static int exfat_move_file(struct inode *parent_inode,
1083 struct exfat_uni_name *p_uniname, struct exfat_inode_info *ei)
1084 {
1085 int ret, newentry, num_new_entries;
1086 struct exfat_dentry *epmov, *epnew;
1087 struct exfat_entry_set_cache mov_es, new_es;
1088 struct exfat_chain newdir;
1089
1090 num_new_entries = exfat_calc_num_entries(p_uniname);
1091 if (num_new_entries < 0)
1092 return num_new_entries;
1093
1094 ret = exfat_get_dentry_set_by_ei(&mov_es, parent_inode->i_sb, ei);
1095 if (ret)
1096 return -EIO;
1097
1098 newentry = exfat_find_empty_entry(parent_inode, &newdir,
1099 num_new_entries, &new_es);
1100 if (newentry < 0) {
1101 ret = newentry; /* -EIO or -ENOSPC */
1102 goto put_mov_es;
1103 }
1104
1105 epmov = exfat_get_dentry_cached(&mov_es, ES_IDX_FILE);
1106 epnew = exfat_get_dentry_cached(&new_es, ES_IDX_FILE);
1107 *epnew = *epmov;
1108 if (exfat_get_entry_type(epnew) == TYPE_FILE) {
1109 epnew->dentry.file.attr |= cpu_to_le16(EXFAT_ATTR_ARCHIVE);
1110 ei->attr |= EXFAT_ATTR_ARCHIVE;
1111 }
1112
1113 epmov = exfat_get_dentry_cached(&mov_es, ES_IDX_STREAM);
1114 epnew = exfat_get_dentry_cached(&new_es, ES_IDX_STREAM);
1115 *epnew = *epmov;
1116
1117 exfat_init_ext_entry(&new_es, num_new_entries, p_uniname);
1118 exfat_remove_entries(parent_inode, &mov_es, ES_IDX_FILE);
1119
1120 ei->dir = newdir;
1121 ei->entry = newentry;
1122
1123 ret = exfat_put_dentry_set(&new_es, IS_DIRSYNC(parent_inode));
1124 if (ret)
1125 goto put_mov_es;
1126
1127 return exfat_put_dentry_set(&mov_es, IS_DIRSYNC(parent_inode));
1128
1129 put_mov_es:
1130 exfat_put_dentry_set(&mov_es, false);
1131
1132 return ret;
1133 }
1134
1135 /* rename or move a old file into a new file */
__exfat_rename(struct inode * old_parent_inode,struct exfat_inode_info * ei,struct inode * new_parent_inode,struct dentry * new_dentry)1136 static int __exfat_rename(struct inode *old_parent_inode,
1137 struct exfat_inode_info *ei, struct inode *new_parent_inode,
1138 struct dentry *new_dentry)
1139 {
1140 int ret;
1141 struct exfat_uni_name uni_name;
1142 struct super_block *sb = old_parent_inode->i_sb;
1143 struct exfat_sb_info *sbi = EXFAT_SB(sb);
1144 const unsigned char *new_path = new_dentry->d_name.name;
1145 struct inode *new_inode = new_dentry->d_inode;
1146 struct exfat_inode_info *new_ei = NULL;
1147
1148 /* check the validity of pointer parameters */
1149 if (new_path == NULL || strlen(new_path) == 0)
1150 return -EINVAL;
1151
1152 if (ei->dir.dir == DIR_DELETED) {
1153 exfat_err(sb, "abnormal access to deleted source dentry");
1154 return -ENOENT;
1155 }
1156
1157 /* check whether new dir is existing directory and empty */
1158 if (new_inode) {
1159 ret = -EIO;
1160 new_ei = EXFAT_I(new_inode);
1161
1162 if (new_ei->dir.dir == DIR_DELETED) {
1163 exfat_err(sb, "abnormal access to deleted target dentry");
1164 goto out;
1165 }
1166
1167 /* if new_inode exists, update ei */
1168 if (S_ISDIR(new_inode->i_mode)) {
1169 struct exfat_chain new_clu;
1170
1171 new_clu.dir = new_ei->start_clu;
1172 new_clu.size =
1173 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(new_inode),
1174 sbi);
1175 new_clu.flags = new_ei->flags;
1176
1177 ret = exfat_check_dir_empty(sb, &new_clu);
1178 if (ret)
1179 goto out;
1180 }
1181 }
1182
1183 /* check the validity of directory name in the given new pathname */
1184 ret = exfat_resolve_path(new_parent_inode, new_path, &uni_name);
1185 if (ret)
1186 goto out;
1187
1188 exfat_set_volume_dirty(sb);
1189
1190 if (new_parent_inode == old_parent_inode)
1191 ret = exfat_rename_file(new_parent_inode, &uni_name, ei);
1192 else
1193 ret = exfat_move_file(new_parent_inode, &uni_name, ei);
1194
1195 if (!ret && new_inode) {
1196 struct exfat_entry_set_cache es;
1197
1198 /* delete entries of new_dir */
1199 ret = exfat_get_dentry_set_by_ei(&es, sb, new_ei);
1200 if (ret) {
1201 ret = -EIO;
1202 goto del_out;
1203 }
1204
1205 exfat_remove_entries(new_inode, &es, ES_IDX_FILE);
1206
1207 ret = exfat_put_dentry_set(&es, IS_DIRSYNC(new_inode));
1208 if (ret)
1209 goto del_out;
1210
1211 /* Free the clusters if new_inode is a dir(as if exfat_rmdir) */
1212 if (S_ISDIR(new_inode->i_mode) &&
1213 new_ei->start_clu != EXFAT_EOF_CLUSTER) {
1214 /* new_ei, new_clu_to_free */
1215 struct exfat_chain new_clu_to_free;
1216
1217 exfat_chain_set(&new_clu_to_free, new_ei->start_clu,
1218 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(new_inode),
1219 sbi), new_ei->flags);
1220
1221 if (exfat_free_cluster(new_inode, &new_clu_to_free)) {
1222 /* just set I/O error only */
1223 ret = -EIO;
1224 }
1225
1226 i_size_write(new_inode, 0);
1227 new_ei->valid_size = 0;
1228 new_ei->start_clu = EXFAT_EOF_CLUSTER;
1229 new_ei->flags = ALLOC_NO_FAT_CHAIN;
1230 }
1231 del_out:
1232 /* Update new_inode ei
1233 * Prevent syncing removed new_inode
1234 * (new_ei is already initialized above code ("if (new_inode)")
1235 */
1236 new_ei->dir.dir = DIR_DELETED;
1237 }
1238 out:
1239 return ret;
1240 }
1241
exfat_rename(struct mnt_idmap * idmap,struct inode * old_dir,struct dentry * old_dentry,struct inode * new_dir,struct dentry * new_dentry,unsigned int flags)1242 static int exfat_rename(struct mnt_idmap *idmap,
1243 struct inode *old_dir, struct dentry *old_dentry,
1244 struct inode *new_dir, struct dentry *new_dentry,
1245 unsigned int flags)
1246 {
1247 struct inode *old_inode, *new_inode;
1248 struct super_block *sb = old_dir->i_sb;
1249 loff_t i_pos;
1250 int err;
1251 loff_t size = i_size_read(new_dir);
1252
1253 /*
1254 * The VFS already checks for existence, so for local filesystems
1255 * the RENAME_NOREPLACE implementation is equivalent to plain rename.
1256 * Don't support any other flags
1257 */
1258 if (flags & ~RENAME_NOREPLACE)
1259 return -EINVAL;
1260
1261 mutex_lock(&EXFAT_SB(sb)->s_lock);
1262 old_inode = old_dentry->d_inode;
1263 new_inode = new_dentry->d_inode;
1264
1265 err = __exfat_rename(old_dir, EXFAT_I(old_inode), new_dir, new_dentry);
1266 if (err)
1267 goto unlock;
1268
1269 inode_inc_iversion(new_dir);
1270 simple_rename_timestamp(old_dir, old_dentry, new_dir, new_dentry);
1271 EXFAT_I(new_dir)->i_crtime = current_time(new_dir);
1272 exfat_truncate_inode_atime(new_dir);
1273 if (IS_DIRSYNC(new_dir) && size != i_size_read(new_dir))
1274 exfat_sync_inode(new_dir);
1275 else
1276 mark_inode_dirty(new_dir);
1277
1278 i_pos = ((loff_t)EXFAT_I(old_inode)->dir.dir << 32) |
1279 (EXFAT_I(old_inode)->entry & 0xffffffff);
1280 exfat_unhash_inode(old_inode);
1281 exfat_hash_inode(old_inode, i_pos);
1282 if (IS_DIRSYNC(new_dir))
1283 exfat_sync_inode(old_inode);
1284 else
1285 mark_inode_dirty(old_inode);
1286
1287 if (S_ISDIR(old_inode->i_mode) && old_dir != new_dir) {
1288 drop_nlink(old_dir);
1289 if (!new_inode)
1290 inc_nlink(new_dir);
1291 }
1292
1293 inode_inc_iversion(old_dir);
1294 if (new_dir != old_dir)
1295 mark_inode_dirty(old_dir);
1296
1297 if (new_inode) {
1298 exfat_unhash_inode(new_inode);
1299
1300 /* skip drop_nlink if new_inode already has been dropped */
1301 if (new_inode->i_nlink) {
1302 drop_nlink(new_inode);
1303 if (S_ISDIR(new_inode->i_mode))
1304 drop_nlink(new_inode);
1305 } else {
1306 exfat_warn(sb, "abnormal access to an inode dropped");
1307 WARN_ON(new_inode->i_nlink == 0);
1308 }
1309 EXFAT_I(new_inode)->i_crtime = current_time(new_inode);
1310 }
1311
1312 unlock:
1313 mutex_unlock(&EXFAT_SB(sb)->s_lock);
1314 return err;
1315 }
1316
1317 const struct inode_operations exfat_dir_inode_operations = {
1318 .create = exfat_create,
1319 .lookup = exfat_lookup,
1320 .unlink = exfat_unlink,
1321 .mkdir = exfat_mkdir,
1322 .rmdir = exfat_rmdir,
1323 .rename = exfat_rename,
1324 .setattr = exfat_setattr,
1325 .getattr = exfat_getattr,
1326 };
1327