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[J-linux.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 if necessary */
69 static 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  */
84 static 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
106 static 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
135 const 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
141 static 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
167 static 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
201 const 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 /* search EMPTY CONTINUOUS "num_entries" entries */
208 static int exfat_search_empty_slot(struct super_block *sb,
209                 struct exfat_hint_femp *hint_femp, struct exfat_chain *p_dir,
210                 int num_entries, struct exfat_entry_set_cache *es)
211 {
212         int i, dentry, ret;
213         int dentries_per_clu;
214         struct exfat_chain clu;
215         struct exfat_sb_info *sbi = EXFAT_SB(sb);
216         int total_entries = EXFAT_CLU_TO_DEN(p_dir->size, sbi);
217
218         dentries_per_clu = sbi->dentries_per_clu;
219
220         if (hint_femp->eidx != EXFAT_HINT_NONE) {
221                 dentry = hint_femp->eidx;
222
223                 /*
224                  * If hint_femp->count is enough, it is needed to check if
225                  * there are actual empty entries.
226                  * Otherwise, and if "dentry + hint_famp->count" is also equal
227                  * to "p_dir->size * dentries_per_clu", it means ENOSPC.
228                  */
229                 if (dentry + hint_femp->count == total_entries &&
230                     num_entries > hint_femp->count)
231                         return -ENOSPC;
232
233                 hint_femp->eidx = EXFAT_HINT_NONE;
234                 exfat_chain_dup(&clu, &hint_femp->cur);
235         } else {
236                 exfat_chain_dup(&clu, p_dir);
237                 dentry = 0;
238         }
239
240         while (dentry + num_entries < total_entries &&
241                clu.dir != EXFAT_EOF_CLUSTER) {
242                 i = dentry & (dentries_per_clu - 1);
243
244                 ret = exfat_get_empty_dentry_set(es, sb, &clu, i, num_entries);
245                 if (ret < 0)
246                         return ret;
247                 else if (ret == 0)
248                         return dentry;
249
250                 dentry += ret;
251                 i += ret;
252
253                 while (i >= dentries_per_clu) {
254                         if (clu.flags == ALLOC_NO_FAT_CHAIN) {
255                                 if (--clu.size > 0)
256                                         clu.dir++;
257                                 else
258                                         clu.dir = EXFAT_EOF_CLUSTER;
259                         } else {
260                                 if (exfat_get_next_cluster(sb, &clu.dir))
261                                         return -EIO;
262                         }
263
264                         i -= dentries_per_clu;
265                 }
266         }
267
268         hint_femp->eidx = dentry;
269         hint_femp->count = 0;
270         if (dentry == total_entries || clu.dir == EXFAT_EOF_CLUSTER)
271                 exfat_chain_set(&hint_femp->cur, EXFAT_EOF_CLUSTER, 0,
272                                 clu.flags);
273         else
274                 hint_femp->cur = clu;
275
276         return -ENOSPC;
277 }
278
279 static int exfat_check_max_dentries(struct inode *inode)
280 {
281         if (EXFAT_B_TO_DEN(i_size_read(inode)) >= MAX_EXFAT_DENTRIES) {
282                 /*
283                  * exFAT spec allows a dir to grow up to 8388608(256MB)
284                  * dentries
285                  */
286                 return -ENOSPC;
287         }
288         return 0;
289 }
290
291 /*
292  * Find an empty directory entry set.
293  *
294  * If there isn't any empty slot, expand cluster chain.
295  *
296  * in:
297  *   inode: inode of the parent directory
298  *   num_entries: specifies how many dentries in the empty directory entry set
299  *
300  * out:
301  *   p_dir: the cluster where the empty directory entry set is located
302  *   es: The found empty directory entry set
303  *
304  * return:
305  *   the directory entry index in p_dir is returned on succeeds
306  *   -error code is returned on failure
307  */
308 static int exfat_find_empty_entry(struct inode *inode,
309                 struct exfat_chain *p_dir, int num_entries,
310                 struct exfat_entry_set_cache *es)
311 {
312         int dentry;
313         unsigned int ret, last_clu;
314         loff_t size = 0;
315         struct exfat_chain clu;
316         struct super_block *sb = inode->i_sb;
317         struct exfat_sb_info *sbi = EXFAT_SB(sb);
318         struct exfat_inode_info *ei = EXFAT_I(inode);
319         struct exfat_hint_femp hint_femp;
320
321         hint_femp.eidx = EXFAT_HINT_NONE;
322
323         if (ei->hint_femp.eidx != EXFAT_HINT_NONE) {
324                 hint_femp = ei->hint_femp;
325                 ei->hint_femp.eidx = EXFAT_HINT_NONE;
326         }
327
328         exfat_chain_set(p_dir, ei->start_clu,
329                         EXFAT_B_TO_CLU(i_size_read(inode), sbi), ei->flags);
330
331         while ((dentry = exfat_search_empty_slot(sb, &hint_femp, p_dir,
332                                         num_entries, es)) < 0) {
333                 if (dentry != -ENOSPC)
334                         return dentry;
335
336                 if (exfat_check_max_dentries(inode))
337                         return -ENOSPC;
338
339                 /*
340                  * Allocate new cluster to this directory
341                  */
342                 if (ei->start_clu != EXFAT_EOF_CLUSTER) {
343                         /* we trust p_dir->size regardless of FAT type */
344                         if (exfat_find_last_cluster(sb, p_dir, &last_clu))
345                                 return -EIO;
346
347                         exfat_chain_set(&clu, last_clu + 1, 0, p_dir->flags);
348                 } else {
349                         /* This directory is empty */
350                         exfat_chain_set(&clu, EXFAT_EOF_CLUSTER, 0,
351                                         ALLOC_NO_FAT_CHAIN);
352                 }
353
354                 /* allocate a cluster */
355                 ret = exfat_alloc_cluster(inode, 1, &clu, IS_DIRSYNC(inode));
356                 if (ret)
357                         return ret;
358
359                 if (exfat_zeroed_cluster(inode, clu.dir))
360                         return -EIO;
361
362                 if (ei->start_clu == EXFAT_EOF_CLUSTER) {
363                         ei->start_clu = clu.dir;
364                         p_dir->dir = clu.dir;
365                         hint_femp.eidx = 0;
366                 }
367
368                 /* append to the FAT chain */
369                 if (clu.flags != p_dir->flags) {
370                         /* no-fat-chain bit is disabled,
371                          * so fat-chain should be synced with alloc-bitmap
372                          */
373                         exfat_chain_cont_cluster(sb, p_dir->dir, p_dir->size);
374                         p_dir->flags = ALLOC_FAT_CHAIN;
375                         hint_femp.cur.flags = ALLOC_FAT_CHAIN;
376                 }
377
378                 if (clu.flags == ALLOC_FAT_CHAIN)
379                         if (exfat_ent_set(sb, last_clu, clu.dir))
380                                 return -EIO;
381
382                 if (hint_femp.cur.dir == EXFAT_EOF_CLUSTER)
383                         exfat_chain_set(&hint_femp.cur, clu.dir, 0, clu.flags);
384
385                 hint_femp.count += sbi->dentries_per_clu;
386
387                 hint_femp.cur.size++;
388                 p_dir->size++;
389                 size = EXFAT_CLU_TO_B(p_dir->size, sbi);
390
391                 /* directory inode should be updated in here */
392                 i_size_write(inode, size);
393                 ei->valid_size += sbi->cluster_size;
394                 ei->flags = p_dir->flags;
395                 inode->i_blocks += sbi->cluster_size >> 9;
396         }
397
398         p_dir->dir = exfat_sector_to_cluster(sbi, es->bh[0]->b_blocknr);
399         p_dir->size -= dentry / sbi->dentries_per_clu;
400
401         return dentry & (sbi->dentries_per_clu - 1);
402 }
403
404 /*
405  * Name Resolution Functions :
406  * Zero if it was successful; otherwise nonzero.
407  */
408 static int __exfat_resolve_path(struct inode *inode, const unsigned char *path,
409                 struct exfat_uni_name *p_uniname, int lookup)
410 {
411         int namelen;
412         int lossy = NLS_NAME_NO_LOSSY;
413         struct super_block *sb = inode->i_sb;
414         int pathlen = strlen(path);
415
416         /*
417          * get the length of the pathname excluding
418          * trailing periods, if any.
419          */
420         namelen = exfat_striptail_len(pathlen, path, false);
421         if (EXFAT_SB(sb)->options.keep_last_dots) {
422                 /*
423                  * Do not allow the creation of files with names
424                  * ending with period(s).
425                  */
426                 if (!lookup && (namelen < pathlen))
427                         return -EINVAL;
428                 namelen = pathlen;
429         }
430         if (!namelen)
431                 return -ENOENT;
432         if (pathlen > (MAX_NAME_LENGTH * MAX_CHARSET_SIZE))
433                 return -ENAMETOOLONG;
434
435         /*
436          * strip all leading spaces :
437          * "MS windows 7" supports leading spaces.
438          * So we should skip this preprocessing for compatibility.
439          */
440
441         /* file name conversion :
442          * If lookup case, we allow bad-name for compatibility.
443          */
444         namelen = exfat_nls_to_utf16(sb, path, namelen, p_uniname,
445                         &lossy);
446         if (namelen < 0)
447                 return namelen; /* return error value */
448
449         if ((lossy && !lookup) || !namelen)
450                 return (lossy & NLS_NAME_OVERLEN) ? -ENAMETOOLONG : -EINVAL;
451
452         return 0;
453 }
454
455 static inline int exfat_resolve_path(struct inode *inode,
456                 const unsigned char *path, struct exfat_uni_name *uni)
457 {
458         return __exfat_resolve_path(inode, path, uni, 0);
459 }
460
461 static inline int exfat_resolve_path_for_lookup(struct inode *inode,
462                 const unsigned char *path, struct exfat_uni_name *uni)
463 {
464         return __exfat_resolve_path(inode, path, uni, 1);
465 }
466
467 static inline loff_t exfat_make_i_pos(struct exfat_dir_entry *info)
468 {
469         return ((loff_t) info->dir.dir << 32) | (info->entry & 0xffffffff);
470 }
471
472 static int exfat_add_entry(struct inode *inode, const char *path,
473                 unsigned int type, 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         struct timespec64 ts = current_time(inode);
481         struct exfat_entry_set_cache es;
482         int clu_size = 0;
483         unsigned int start_clu = EXFAT_FREE_CLUSTER;
484
485         ret = exfat_resolve_path(inode, path, &uniname);
486         if (ret)
487                 goto out;
488
489         num_entries = exfat_calc_num_entries(&uniname);
490         if (num_entries < 0) {
491                 ret = num_entries;
492                 goto out;
493         }
494
495         /* exfat_find_empty_entry must be called before alloc_cluster() */
496         dentry = exfat_find_empty_entry(inode, &info->dir, num_entries, &es);
497         if (dentry < 0) {
498                 ret = dentry; /* -EIO or -ENOSPC */
499                 goto out;
500         }
501
502         if (type == TYPE_DIR && !sbi->options.zero_size_dir) {
503                 ret = exfat_alloc_new_dir(inode, &clu);
504                 if (ret) {
505                         exfat_put_dentry_set(&es, false);
506                         goto out;
507                 }
508                 start_clu = clu.dir;
509                 clu_size = sbi->cluster_size;
510         }
511
512         /* update the directory entry */
513         /* fill the dos name directory entry information of the created file.
514          * the first cluster is not determined yet. (0)
515          */
516         exfat_init_dir_entry(&es, type, start_clu, clu_size, &ts);
517         exfat_init_ext_entry(&es, num_entries, &uniname);
518
519         ret = exfat_put_dentry_set(&es, IS_DIRSYNC(inode));
520         if (ret)
521                 goto out;
522
523         info->entry = dentry;
524         info->flags = ALLOC_NO_FAT_CHAIN;
525         info->type = type;
526
527         if (type == TYPE_FILE) {
528                 info->attr = EXFAT_ATTR_ARCHIVE;
529                 info->start_clu = EXFAT_EOF_CLUSTER;
530                 info->size = 0;
531                 info->num_subdirs = 0;
532         } else {
533                 info->attr = EXFAT_ATTR_SUBDIR;
534                 if (sbi->options.zero_size_dir)
535                         info->start_clu = EXFAT_EOF_CLUSTER;
536                 else
537                         info->start_clu = start_clu;
538                 info->size = clu_size;
539                 info->num_subdirs = EXFAT_MIN_SUBDIR;
540         }
541         info->valid_size = info->size;
542
543         memset(&info->crtime, 0, sizeof(info->crtime));
544         memset(&info->mtime, 0, sizeof(info->mtime));
545         memset(&info->atime, 0, sizeof(info->atime));
546 out:
547         return ret;
548 }
549
550 static int exfat_create(struct mnt_idmap *idmap, struct inode *dir,
551                         struct dentry *dentry, umode_t mode, bool excl)
552 {
553         struct super_block *sb = dir->i_sb;
554         struct inode *inode;
555         struct exfat_dir_entry info;
556         loff_t i_pos;
557         int err;
558         loff_t size = i_size_read(dir);
559
560         if (unlikely(exfat_forced_shutdown(sb)))
561                 return -EIO;
562
563         mutex_lock(&EXFAT_SB(sb)->s_lock);
564         exfat_set_volume_dirty(sb);
565         err = exfat_add_entry(dir, dentry->d_name.name, TYPE_FILE, &info);
566         if (err)
567                 goto unlock;
568
569         inode_inc_iversion(dir);
570         inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
571         if (IS_DIRSYNC(dir) && size != i_size_read(dir))
572                 exfat_sync_inode(dir);
573         else
574                 mark_inode_dirty(dir);
575
576         i_pos = exfat_make_i_pos(&info);
577         inode = exfat_build_inode(sb, &info, i_pos);
578         err = PTR_ERR_OR_ZERO(inode);
579         if (err)
580                 goto unlock;
581
582         inode_inc_iversion(inode);
583         EXFAT_I(inode)->i_crtime = simple_inode_init_ts(inode);
584         exfat_truncate_inode_atime(inode);
585
586         /* timestamp is already written, so mark_inode_dirty() is unneeded. */
587
588         d_instantiate(dentry, inode);
589 unlock:
590         mutex_unlock(&EXFAT_SB(sb)->s_lock);
591         return err;
592 }
593
594 /* lookup a file */
595 static int exfat_find(struct inode *dir, struct qstr *qname,
596                 struct exfat_dir_entry *info)
597 {
598         int ret, dentry, count;
599         struct exfat_chain cdir;
600         struct exfat_uni_name uni_name;
601         struct super_block *sb = dir->i_sb;
602         struct exfat_sb_info *sbi = EXFAT_SB(sb);
603         struct exfat_inode_info *ei = EXFAT_I(dir);
604         struct exfat_dentry *ep, *ep2;
605         struct exfat_entry_set_cache es;
606         /* for optimized dir & entry to prevent long traverse of cluster chain */
607         struct exfat_hint hint_opt;
608
609         if (qname->len == 0)
610                 return -ENOENT;
611
612         /* check the validity of directory name in the given pathname */
613         ret = exfat_resolve_path_for_lookup(dir, qname->name, &uni_name);
614         if (ret)
615                 return ret;
616
617         exfat_chain_set(&cdir, ei->start_clu,
618                 EXFAT_B_TO_CLU(i_size_read(dir), sbi), ei->flags);
619
620         /* check the validation of hint_stat and initialize it if required */
621         if (ei->version != (inode_peek_iversion_raw(dir) & 0xffffffff)) {
622                 ei->hint_stat.clu = cdir.dir;
623                 ei->hint_stat.eidx = 0;
624                 ei->version = (inode_peek_iversion_raw(dir) & 0xffffffff);
625                 ei->hint_femp.eidx = EXFAT_HINT_NONE;
626         }
627
628         /* search the file name for directories */
629         dentry = exfat_find_dir_entry(sb, ei, &cdir, &uni_name, &hint_opt);
630         if (dentry < 0)
631                 return dentry; /* -error value */
632
633         /* adjust cdir to the optimized value */
634         cdir.dir = hint_opt.clu;
635         if (cdir.flags & ALLOC_NO_FAT_CHAIN)
636                 cdir.size -= dentry / sbi->dentries_per_clu;
637         dentry = hint_opt.eidx;
638
639         info->dir = cdir;
640         info->entry = dentry;
641         info->num_subdirs = 0;
642
643         if (exfat_get_dentry_set(&es, sb, &cdir, dentry, ES_2_ENTRIES))
644                 return -EIO;
645         ep = exfat_get_dentry_cached(&es, ES_IDX_FILE);
646         ep2 = exfat_get_dentry_cached(&es, ES_IDX_STREAM);
647
648         info->type = exfat_get_entry_type(ep);
649         info->attr = le16_to_cpu(ep->dentry.file.attr);
650         info->size = le64_to_cpu(ep2->dentry.stream.valid_size);
651         info->valid_size = le64_to_cpu(ep2->dentry.stream.valid_size);
652         info->size = le64_to_cpu(ep2->dentry.stream.size);
653
654         info->start_clu = le32_to_cpu(ep2->dentry.stream.start_clu);
655         if (!is_valid_cluster(sbi, info->start_clu) && info->size) {
656                 exfat_warn(sb, "start_clu is invalid cluster(0x%x)",
657                                 info->start_clu);
658                 info->size = 0;
659                 info->valid_size = 0;
660         }
661
662         if (info->valid_size > info->size) {
663                 exfat_warn(sb, "valid_size(%lld) is greater than size(%lld)",
664                                 info->valid_size, info->size);
665                 info->valid_size = info->size;
666         }
667
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
674         exfat_get_entry_time(sbi, &info->crtime,
675                              ep->dentry.file.create_tz,
676                              ep->dentry.file.create_time,
677                              ep->dentry.file.create_date,
678                              ep->dentry.file.create_time_cs);
679         exfat_get_entry_time(sbi, &info->mtime,
680                              ep->dentry.file.modify_tz,
681                              ep->dentry.file.modify_time,
682                              ep->dentry.file.modify_date,
683                              ep->dentry.file.modify_time_cs);
684         exfat_get_entry_time(sbi, &info->atime,
685                              ep->dentry.file.access_tz,
686                              ep->dentry.file.access_time,
687                              ep->dentry.file.access_date,
688                              0);
689         exfat_put_dentry_set(&es, false);
690
691         if (ei->start_clu == EXFAT_FREE_CLUSTER) {
692                 exfat_fs_error(sb,
693                                "non-zero size file starts with zero cluster (size : %llu, p_dir : %u, entry : 0x%08x)",
694                                i_size_read(dir), ei->dir.dir, ei->entry);
695                 return -EIO;
696         }
697
698         if (info->type == TYPE_DIR) {
699                 exfat_chain_set(&cdir, info->start_clu,
700                                 EXFAT_B_TO_CLU(info->size, sbi), info->flags);
701                 count = exfat_count_dir_entries(sb, &cdir);
702                 if (count < 0)
703                         return -EIO;
704
705                 info->num_subdirs = count + EXFAT_MIN_SUBDIR;
706         }
707         return 0;
708 }
709
710 static int exfat_d_anon_disconn(struct dentry *dentry)
711 {
712         return IS_ROOT(dentry) && (dentry->d_flags & DCACHE_DISCONNECTED);
713 }
714
715 static struct dentry *exfat_lookup(struct inode *dir, struct dentry *dentry,
716                 unsigned int flags)
717 {
718         struct super_block *sb = dir->i_sb;
719         struct inode *inode;
720         struct dentry *alias;
721         struct exfat_dir_entry info;
722         int err;
723         loff_t i_pos;
724         mode_t i_mode;
725
726         mutex_lock(&EXFAT_SB(sb)->s_lock);
727         err = exfat_find(dir, &dentry->d_name, &info);
728         if (err) {
729                 if (err == -ENOENT) {
730                         inode = NULL;
731                         goto out;
732                 }
733                 goto unlock;
734         }
735
736         i_pos = exfat_make_i_pos(&info);
737         inode = exfat_build_inode(sb, &info, i_pos);
738         err = PTR_ERR_OR_ZERO(inode);
739         if (err)
740                 goto unlock;
741
742         i_mode = inode->i_mode;
743         alias = d_find_alias(inode);
744
745         /*
746          * Checking "alias->d_parent == dentry->d_parent" to make sure
747          * FS is not corrupted (especially double linked dir).
748          */
749         if (alias && alias->d_parent == dentry->d_parent &&
750                         !exfat_d_anon_disconn(alias)) {
751
752                 /*
753                  * Unhashed alias is able to exist because of revalidate()
754                  * called by lookup_fast. You can easily make this status
755                  * by calling create and lookup concurrently
756                  * In such case, we reuse an alias instead of new dentry
757                  */
758                 if (d_unhashed(alias)) {
759                         WARN_ON(alias->d_name.hash_len !=
760                                 dentry->d_name.hash_len);
761                         exfat_info(sb, "rehashed a dentry(%p) in read lookup",
762                                    alias);
763                         d_drop(dentry);
764                         d_rehash(alias);
765                 } else if (!S_ISDIR(i_mode)) {
766                         /*
767                          * This inode has non anonymous-DCACHE_DISCONNECTED
768                          * dentry. This means, the user did ->lookup() by an
769                          * another name (longname vs 8.3 alias of it) in past.
770                          *
771                          * Switch to new one for reason of locality if possible.
772                          */
773                         d_move(alias, dentry);
774                 }
775                 iput(inode);
776                 mutex_unlock(&EXFAT_SB(sb)->s_lock);
777                 return alias;
778         }
779         dput(alias);
780 out:
781         mutex_unlock(&EXFAT_SB(sb)->s_lock);
782         if (!inode)
783                 exfat_d_version_set(dentry, inode_query_iversion(dir));
784
785         return d_splice_alias(inode, dentry);
786 unlock:
787         mutex_unlock(&EXFAT_SB(sb)->s_lock);
788         return ERR_PTR(err);
789 }
790
791 /* remove an entry, BUT don't truncate */
792 static int exfat_unlink(struct inode *dir, struct dentry *dentry)
793 {
794         struct super_block *sb = dir->i_sb;
795         struct inode *inode = dentry->d_inode;
796         struct exfat_inode_info *ei = EXFAT_I(inode);
797         struct exfat_entry_set_cache es;
798         int err = 0;
799
800         if (unlikely(exfat_forced_shutdown(sb)))
801                 return -EIO;
802
803         mutex_lock(&EXFAT_SB(sb)->s_lock);
804         if (ei->dir.dir == DIR_DELETED) {
805                 exfat_err(sb, "abnormal access to deleted dentry");
806                 err = -ENOENT;
807                 goto unlock;
808         }
809
810         err = exfat_get_dentry_set_by_ei(&es, sb, ei);
811         if (err) {
812                 err = -EIO;
813                 goto unlock;
814         }
815
816         exfat_set_volume_dirty(sb);
817
818         /* update the directory entry */
819         exfat_remove_entries(inode, &es, ES_IDX_FILE);
820
821         err = exfat_put_dentry_set(&es, IS_DIRSYNC(inode));
822         if (err)
823                 goto unlock;
824
825         /* This doesn't modify ei */
826         ei->dir.dir = DIR_DELETED;
827
828         inode_inc_iversion(dir);
829         simple_inode_init_ts(dir);
830         exfat_truncate_inode_atime(dir);
831         mark_inode_dirty(dir);
832
833         clear_nlink(inode);
834         simple_inode_init_ts(inode);
835         exfat_truncate_inode_atime(inode);
836         exfat_unhash_inode(inode);
837         exfat_d_version_set(dentry, inode_query_iversion(dir));
838 unlock:
839         mutex_unlock(&EXFAT_SB(sb)->s_lock);
840         return err;
841 }
842
843 static int exfat_mkdir(struct mnt_idmap *idmap, struct inode *dir,
844                        struct dentry *dentry, umode_t mode)
845 {
846         struct super_block *sb = dir->i_sb;
847         struct inode *inode;
848         struct exfat_dir_entry info;
849         loff_t i_pos;
850         int err;
851         loff_t size = i_size_read(dir);
852
853         if (unlikely(exfat_forced_shutdown(sb)))
854                 return -EIO;
855
856         mutex_lock(&EXFAT_SB(sb)->s_lock);
857         exfat_set_volume_dirty(sb);
858         err = exfat_add_entry(dir, dentry->d_name.name, TYPE_DIR, &info);
859         if (err)
860                 goto unlock;
861
862         inode_inc_iversion(dir);
863         inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
864         if (IS_DIRSYNC(dir) && size != i_size_read(dir))
865                 exfat_sync_inode(dir);
866         else
867                 mark_inode_dirty(dir);
868         inc_nlink(dir);
869
870         i_pos = exfat_make_i_pos(&info);
871         inode = exfat_build_inode(sb, &info, i_pos);
872         err = PTR_ERR_OR_ZERO(inode);
873         if (err)
874                 goto unlock;
875
876         inode_inc_iversion(inode);
877         EXFAT_I(inode)->i_crtime = simple_inode_init_ts(inode);
878         exfat_truncate_inode_atime(inode);
879         /* timestamp is already written, so mark_inode_dirty() is unneeded. */
880
881         d_instantiate(dentry, inode);
882
883 unlock:
884         mutex_unlock(&EXFAT_SB(sb)->s_lock);
885         return err;
886 }
887
888 static int exfat_check_dir_empty(struct super_block *sb,
889                 struct exfat_chain *p_dir)
890 {
891         int i, dentries_per_clu;
892         unsigned int type;
893         struct exfat_chain clu;
894         struct exfat_dentry *ep;
895         struct exfat_sb_info *sbi = EXFAT_SB(sb);
896         struct buffer_head *bh;
897
898         dentries_per_clu = sbi->dentries_per_clu;
899
900         if (p_dir->dir == EXFAT_EOF_CLUSTER)
901                 return 0;
902
903         exfat_chain_dup(&clu, p_dir);
904
905         while (clu.dir != EXFAT_EOF_CLUSTER) {
906                 for (i = 0; i < dentries_per_clu; i++) {
907                         ep = exfat_get_dentry(sb, &clu, i, &bh);
908                         if (!ep)
909                                 return -EIO;
910                         type = exfat_get_entry_type(ep);
911                         brelse(bh);
912                         if (type == TYPE_UNUSED)
913                                 return 0;
914
915                         if (type != TYPE_FILE && type != TYPE_DIR)
916                                 continue;
917
918                         return -ENOTEMPTY;
919                 }
920
921                 if (clu.flags == ALLOC_NO_FAT_CHAIN) {
922                         if (--clu.size > 0)
923                                 clu.dir++;
924                         else
925                                 clu.dir = EXFAT_EOF_CLUSTER;
926                 } else {
927                         if (exfat_get_next_cluster(sb, &(clu.dir)))
928                                 return -EIO;
929                 }
930         }
931
932         return 0;
933 }
934
935 static int exfat_rmdir(struct inode *dir, struct dentry *dentry)
936 {
937         struct inode *inode = dentry->d_inode;
938         struct exfat_chain clu_to_free;
939         struct super_block *sb = inode->i_sb;
940         struct exfat_sb_info *sbi = EXFAT_SB(sb);
941         struct exfat_inode_info *ei = EXFAT_I(inode);
942         struct exfat_entry_set_cache es;
943         int err;
944
945         if (unlikely(exfat_forced_shutdown(sb)))
946                 return -EIO;
947
948         mutex_lock(&EXFAT_SB(inode->i_sb)->s_lock);
949
950         if (ei->dir.dir == DIR_DELETED) {
951                 exfat_err(sb, "abnormal access to deleted dentry");
952                 err = -ENOENT;
953                 goto unlock;
954         }
955
956         exfat_chain_set(&clu_to_free, ei->start_clu,
957                 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(inode), sbi), ei->flags);
958
959         err = exfat_check_dir_empty(sb, &clu_to_free);
960         if (err) {
961                 if (err == -EIO)
962                         exfat_err(sb, "failed to exfat_check_dir_empty : err(%d)",
963                                   err);
964                 goto unlock;
965         }
966
967         err = exfat_get_dentry_set_by_ei(&es, sb, ei);
968         if (err) {
969                 err = -EIO;
970                 goto unlock;
971         }
972
973         exfat_set_volume_dirty(sb);
974
975         exfat_remove_entries(inode, &es, ES_IDX_FILE);
976
977         err = exfat_put_dentry_set(&es, IS_DIRSYNC(dir));
978         if (err)
979                 goto unlock;
980
981         ei->dir.dir = DIR_DELETED;
982
983         inode_inc_iversion(dir);
984         simple_inode_init_ts(dir);
985         exfat_truncate_inode_atime(dir);
986         if (IS_DIRSYNC(dir))
987                 exfat_sync_inode(dir);
988         else
989                 mark_inode_dirty(dir);
990         drop_nlink(dir);
991
992         clear_nlink(inode);
993         simple_inode_init_ts(inode);
994         exfat_truncate_inode_atime(inode);
995         exfat_unhash_inode(inode);
996         exfat_d_version_set(dentry, inode_query_iversion(dir));
997 unlock:
998         mutex_unlock(&EXFAT_SB(inode->i_sb)->s_lock);
999         return err;
1000 }
1001
1002 static int exfat_rename_file(struct inode *parent_inode,
1003                 struct exfat_uni_name *p_uniname, struct exfat_inode_info *ei)
1004 {
1005         int ret, num_new_entries;
1006         struct exfat_dentry *epold, *epnew;
1007         struct super_block *sb = parent_inode->i_sb;
1008         struct exfat_entry_set_cache old_es, new_es;
1009         int sync = IS_DIRSYNC(parent_inode);
1010
1011         if (unlikely(exfat_forced_shutdown(sb)))
1012                 return -EIO;
1013
1014         num_new_entries = exfat_calc_num_entries(p_uniname);
1015         if (num_new_entries < 0)
1016                 return num_new_entries;
1017
1018         ret = exfat_get_dentry_set_by_ei(&old_es, sb, ei);
1019         if (ret) {
1020                 ret = -EIO;
1021                 return ret;
1022         }
1023
1024         epold = exfat_get_dentry_cached(&old_es, ES_IDX_FILE);
1025
1026         if (old_es.num_entries < num_new_entries) {
1027                 int newentry;
1028                 struct exfat_chain dir;
1029
1030                 newentry = exfat_find_empty_entry(parent_inode, &dir,
1031                                 num_new_entries, &new_es);
1032                 if (newentry < 0) {
1033                         ret = newentry; /* -EIO or -ENOSPC */
1034                         goto put_old_es;
1035                 }
1036
1037                 epnew = exfat_get_dentry_cached(&new_es, ES_IDX_FILE);
1038                 *epnew = *epold;
1039                 if (exfat_get_entry_type(epnew) == TYPE_FILE) {
1040                         epnew->dentry.file.attr |= cpu_to_le16(EXFAT_ATTR_ARCHIVE);
1041                         ei->attr |= EXFAT_ATTR_ARCHIVE;
1042                 }
1043
1044                 epold = exfat_get_dentry_cached(&old_es, ES_IDX_STREAM);
1045                 epnew = exfat_get_dentry_cached(&new_es, ES_IDX_STREAM);
1046                 *epnew = *epold;
1047
1048                 exfat_init_ext_entry(&new_es, num_new_entries, p_uniname);
1049
1050                 ret = exfat_put_dentry_set(&new_es, sync);
1051                 if (ret)
1052                         goto put_old_es;
1053
1054                 exfat_remove_entries(parent_inode, &old_es, ES_IDX_FILE);
1055                 ei->dir = dir;
1056                 ei->entry = newentry;
1057         } else {
1058                 if (exfat_get_entry_type(epold) == TYPE_FILE) {
1059                         epold->dentry.file.attr |= cpu_to_le16(EXFAT_ATTR_ARCHIVE);
1060                         ei->attr |= EXFAT_ATTR_ARCHIVE;
1061                 }
1062
1063                 exfat_remove_entries(parent_inode, &old_es, ES_IDX_FIRST_FILENAME + 1);
1064                 exfat_init_ext_entry(&old_es, num_new_entries, p_uniname);
1065         }
1066         return exfat_put_dentry_set(&old_es, sync);
1067
1068 put_old_es:
1069         exfat_put_dentry_set(&old_es, false);
1070         return ret;
1071 }
1072
1073 static int exfat_move_file(struct inode *parent_inode,
1074                 struct exfat_uni_name *p_uniname, struct exfat_inode_info *ei)
1075 {
1076         int ret, newentry, num_new_entries;
1077         struct exfat_dentry *epmov, *epnew;
1078         struct exfat_entry_set_cache mov_es, new_es;
1079         struct exfat_chain newdir;
1080
1081         num_new_entries = exfat_calc_num_entries(p_uniname);
1082         if (num_new_entries < 0)
1083                 return num_new_entries;
1084
1085         ret = exfat_get_dentry_set_by_ei(&mov_es, parent_inode->i_sb, ei);
1086         if (ret)
1087                 return -EIO;
1088
1089         newentry = exfat_find_empty_entry(parent_inode, &newdir,
1090                         num_new_entries, &new_es);
1091         if (newentry < 0) {
1092                 ret = newentry; /* -EIO or -ENOSPC */
1093                 goto put_mov_es;
1094         }
1095
1096         epmov = exfat_get_dentry_cached(&mov_es, ES_IDX_FILE);
1097         epnew = exfat_get_dentry_cached(&new_es, ES_IDX_FILE);
1098         *epnew = *epmov;
1099         if (exfat_get_entry_type(epnew) == TYPE_FILE) {
1100                 epnew->dentry.file.attr |= cpu_to_le16(EXFAT_ATTR_ARCHIVE);
1101                 ei->attr |= EXFAT_ATTR_ARCHIVE;
1102         }
1103
1104         epmov = exfat_get_dentry_cached(&mov_es, ES_IDX_STREAM);
1105         epnew = exfat_get_dentry_cached(&new_es, ES_IDX_STREAM);
1106         *epnew = *epmov;
1107
1108         exfat_init_ext_entry(&new_es, num_new_entries, p_uniname);
1109         exfat_remove_entries(parent_inode, &mov_es, ES_IDX_FILE);
1110
1111         ei->dir = newdir;
1112         ei->entry = newentry;
1113
1114         ret = exfat_put_dentry_set(&new_es, IS_DIRSYNC(parent_inode));
1115         if (ret)
1116                 goto put_mov_es;
1117
1118         return exfat_put_dentry_set(&mov_es, IS_DIRSYNC(parent_inode));
1119
1120 put_mov_es:
1121         exfat_put_dentry_set(&mov_es, false);
1122
1123         return ret;
1124 }
1125
1126 /* rename or move a old file into a new file */
1127 static int __exfat_rename(struct inode *old_parent_inode,
1128                 struct exfat_inode_info *ei, struct inode *new_parent_inode,
1129                 struct dentry *new_dentry)
1130 {
1131         int ret;
1132         struct exfat_uni_name uni_name;
1133         struct super_block *sb = old_parent_inode->i_sb;
1134         struct exfat_sb_info *sbi = EXFAT_SB(sb);
1135         const unsigned char *new_path = new_dentry->d_name.name;
1136         struct inode *new_inode = new_dentry->d_inode;
1137         struct exfat_inode_info *new_ei = NULL;
1138
1139         /* check the validity of pointer parameters */
1140         if (new_path == NULL || strlen(new_path) == 0)
1141                 return -EINVAL;
1142
1143         if (ei->dir.dir == DIR_DELETED) {
1144                 exfat_err(sb, "abnormal access to deleted source dentry");
1145                 return -ENOENT;
1146         }
1147
1148         /* check whether new dir is existing directory and empty */
1149         if (new_inode) {
1150                 ret = -EIO;
1151                 new_ei = EXFAT_I(new_inode);
1152
1153                 if (new_ei->dir.dir == DIR_DELETED) {
1154                         exfat_err(sb, "abnormal access to deleted target dentry");
1155                         goto out;
1156                 }
1157
1158                 /* if new_inode exists, update ei */
1159                 if (S_ISDIR(new_inode->i_mode)) {
1160                         struct exfat_chain new_clu;
1161
1162                         new_clu.dir = new_ei->start_clu;
1163                         new_clu.size =
1164                                 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(new_inode),
1165                                 sbi);
1166                         new_clu.flags = new_ei->flags;
1167
1168                         ret = exfat_check_dir_empty(sb, &new_clu);
1169                         if (ret)
1170                                 goto out;
1171                 }
1172         }
1173
1174         /* check the validity of directory name in the given new pathname */
1175         ret = exfat_resolve_path(new_parent_inode, new_path, &uni_name);
1176         if (ret)
1177                 goto out;
1178
1179         exfat_set_volume_dirty(sb);
1180
1181         if (new_parent_inode == old_parent_inode)
1182                 ret = exfat_rename_file(new_parent_inode, &uni_name, ei);
1183         else
1184                 ret = exfat_move_file(new_parent_inode, &uni_name, ei);
1185
1186         if (!ret && new_inode) {
1187                 struct exfat_entry_set_cache es;
1188
1189                 /* delete entries of new_dir */
1190                 ret = exfat_get_dentry_set_by_ei(&es, sb, new_ei);
1191                 if (ret) {
1192                         ret = -EIO;
1193                         goto del_out;
1194                 }
1195
1196                 exfat_remove_entries(new_inode, &es, ES_IDX_FILE);
1197
1198                 ret = exfat_put_dentry_set(&es, IS_DIRSYNC(new_inode));
1199                 if (ret)
1200                         goto del_out;
1201
1202                 /* Free the clusters if new_inode is a dir(as if exfat_rmdir) */
1203                 if (S_ISDIR(new_inode->i_mode) &&
1204                     new_ei->start_clu != EXFAT_EOF_CLUSTER) {
1205                         /* new_ei, new_clu_to_free */
1206                         struct exfat_chain new_clu_to_free;
1207
1208                         exfat_chain_set(&new_clu_to_free, new_ei->start_clu,
1209                                 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(new_inode),
1210                                 sbi), new_ei->flags);
1211
1212                         if (exfat_free_cluster(new_inode, &new_clu_to_free)) {
1213                                 /* just set I/O error only */
1214                                 ret = -EIO;
1215                         }
1216
1217                         i_size_write(new_inode, 0);
1218                         new_ei->valid_size = 0;
1219                         new_ei->start_clu = EXFAT_EOF_CLUSTER;
1220                         new_ei->flags = ALLOC_NO_FAT_CHAIN;
1221                 }
1222 del_out:
1223                 /* Update new_inode ei
1224                  * Prevent syncing removed new_inode
1225                  * (new_ei is already initialized above code ("if (new_inode)")
1226                  */
1227                 new_ei->dir.dir = DIR_DELETED;
1228         }
1229 out:
1230         return ret;
1231 }
1232
1233 static int exfat_rename(struct mnt_idmap *idmap,
1234                         struct inode *old_dir, struct dentry *old_dentry,
1235                         struct inode *new_dir, struct dentry *new_dentry,
1236                         unsigned int flags)
1237 {
1238         struct inode *old_inode, *new_inode;
1239         struct super_block *sb = old_dir->i_sb;
1240         loff_t i_pos;
1241         int err;
1242         loff_t size = i_size_read(new_dir);
1243
1244         /*
1245          * The VFS already checks for existence, so for local filesystems
1246          * the RENAME_NOREPLACE implementation is equivalent to plain rename.
1247          * Don't support any other flags
1248          */
1249         if (flags & ~RENAME_NOREPLACE)
1250                 return -EINVAL;
1251
1252         mutex_lock(&EXFAT_SB(sb)->s_lock);
1253         old_inode = old_dentry->d_inode;
1254         new_inode = new_dentry->d_inode;
1255
1256         err = __exfat_rename(old_dir, EXFAT_I(old_inode), new_dir, new_dentry);
1257         if (err)
1258                 goto unlock;
1259
1260         inode_inc_iversion(new_dir);
1261         simple_rename_timestamp(old_dir, old_dentry, new_dir, new_dentry);
1262         EXFAT_I(new_dir)->i_crtime = current_time(new_dir);
1263         exfat_truncate_inode_atime(new_dir);
1264         if (IS_DIRSYNC(new_dir) && size != i_size_read(new_dir))
1265                 exfat_sync_inode(new_dir);
1266         else
1267                 mark_inode_dirty(new_dir);
1268
1269         i_pos = ((loff_t)EXFAT_I(old_inode)->dir.dir << 32) |
1270                 (EXFAT_I(old_inode)->entry & 0xffffffff);
1271         exfat_unhash_inode(old_inode);
1272         exfat_hash_inode(old_inode, i_pos);
1273         if (IS_DIRSYNC(new_dir))
1274                 exfat_sync_inode(old_inode);
1275         else
1276                 mark_inode_dirty(old_inode);
1277
1278         if (S_ISDIR(old_inode->i_mode) && old_dir != new_dir) {
1279                 drop_nlink(old_dir);
1280                 if (!new_inode)
1281                         inc_nlink(new_dir);
1282         }
1283
1284         inode_inc_iversion(old_dir);
1285         if (new_dir != old_dir)
1286                 mark_inode_dirty(old_dir);
1287
1288         if (new_inode) {
1289                 exfat_unhash_inode(new_inode);
1290
1291                 /* skip drop_nlink if new_inode already has been dropped */
1292                 if (new_inode->i_nlink) {
1293                         drop_nlink(new_inode);
1294                         if (S_ISDIR(new_inode->i_mode))
1295                                 drop_nlink(new_inode);
1296                 } else {
1297                         exfat_warn(sb, "abnormal access to an inode dropped");
1298                         WARN_ON(new_inode->i_nlink == 0);
1299                 }
1300                 EXFAT_I(new_inode)->i_crtime = current_time(new_inode);
1301         }
1302
1303 unlock:
1304         mutex_unlock(&EXFAT_SB(sb)->s_lock);
1305         return err;
1306 }
1307
1308 const struct inode_operations exfat_dir_inode_operations = {
1309         .create         = exfat_create,
1310         .lookup         = exfat_lookup,
1311         .unlink         = exfat_unlink,
1312         .mkdir          = exfat_mkdir,
1313         .rmdir          = exfat_rmdir,
1314         .rename         = exfat_rename,
1315         .setattr        = exfat_setattr,
1316         .getattr        = exfat_getattr,
1317 };
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