1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
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>
12 #include "exfat_raw.h"
15 static inline unsigned long exfat_d_version(struct dentry
*dentry
)
17 return (unsigned long) dentry
->d_fsdata
;
20 static inline void exfat_d_version_set(struct dentry
*dentry
,
21 unsigned long version
)
23 dentry
->d_fsdata
= (void *) version
;
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.
31 * If it happened, the negative dentry isn't actually negative anymore. So,
34 static int exfat_d_revalidate(struct dentry
*dentry
, unsigned int flags
)
38 if (flags
& LOOKUP_RCU
)
42 * This is not negative dentry. Always valid.
44 * Note, rename() to existing directory entry will have ->d_inode, and
45 * will use existing name which isn't specified name by user.
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.
51 if (d_really_is_positive(dentry
))
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.
58 if (flags
& (LOOKUP_CREATE
| LOOKUP_RENAME_TARGET
))
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
);
68 /* returns the length of a struct qstr, ignoring trailing dots */
69 static unsigned int exfat_striptail_len(unsigned int len
, const char *name
)
71 while (len
&& name
[len
- 1] == '.')
77 * Compute the hash for the exfat name corresponding to the dentry. If the name
78 * is invalid, we leave the hash code unchanged so that the existing dentry can
79 * be used. The exfat fs routines will return ENOENT or EINVAL as appropriate.
81 static int exfat_d_hash(const struct dentry
*dentry
, struct qstr
*qstr
)
83 struct super_block
*sb
= dentry
->d_sb
;
84 struct nls_table
*t
= EXFAT_SB(sb
)->nls_io
;
85 const unsigned char *name
= qstr
->name
;
86 unsigned int len
= exfat_striptail_len(qstr
->len
, qstr
->name
);
87 unsigned long hash
= init_name_hash(dentry
);
91 for (i
= 0; i
< len
; i
+= charlen
) {
92 charlen
= t
->char2uni(&name
[i
], len
- i
, &c
);
95 hash
= partial_name_hash(exfat_toupper(sb
, c
), hash
);
98 qstr
->hash
= end_name_hash(hash
);
102 static int exfat_d_cmp(const struct dentry
*dentry
, unsigned int len
,
103 const char *str
, const struct qstr
*name
)
105 struct super_block
*sb
= dentry
->d_sb
;
106 struct nls_table
*t
= EXFAT_SB(sb
)->nls_io
;
107 unsigned int alen
= exfat_striptail_len(name
->len
, name
->name
);
108 unsigned int blen
= exfat_striptail_len(len
, str
);
115 for (i
= 0; i
< len
; i
+= charlen
) {
116 charlen
= t
->char2uni(&name
->name
[i
], alen
- i
, &c1
);
119 if (charlen
!= t
->char2uni(&str
[i
], blen
- i
, &c2
))
122 if (exfat_toupper(sb
, c1
) != exfat_toupper(sb
, c2
))
129 const struct dentry_operations exfat_dentry_ops
= {
130 .d_revalidate
= exfat_d_revalidate
,
131 .d_hash
= exfat_d_hash
,
132 .d_compare
= exfat_d_cmp
,
135 static int exfat_utf8_d_hash(const struct dentry
*dentry
, struct qstr
*qstr
)
137 struct super_block
*sb
= dentry
->d_sb
;
138 const unsigned char *name
= qstr
->name
;
139 unsigned int len
= exfat_striptail_len(qstr
->len
, qstr
->name
);
140 unsigned long hash
= init_name_hash(dentry
);
144 for (i
= 0; i
< len
; i
+= charlen
) {
145 charlen
= utf8_to_utf32(&name
[i
], len
- i
, &u
);
150 * exfat_toupper() works only for code points up to the U+FFFF.
152 hash
= partial_name_hash(u
<= 0xFFFF ? exfat_toupper(sb
, u
) : u
,
156 qstr
->hash
= end_name_hash(hash
);
160 static int exfat_utf8_d_cmp(const struct dentry
*dentry
, unsigned int len
,
161 const char *str
, const struct qstr
*name
)
163 struct super_block
*sb
= dentry
->d_sb
;
164 unsigned int alen
= exfat_striptail_len(name
->len
, name
->name
);
165 unsigned int blen
= exfat_striptail_len(len
, str
);
172 for (i
= 0; i
< alen
; i
+= charlen
) {
173 charlen
= utf8_to_utf32(&name
->name
[i
], alen
- i
, &u_a
);
176 if (charlen
!= utf8_to_utf32(&str
[i
], blen
- i
, &u_b
))
179 if (u_a
<= 0xFFFF && u_b
<= 0xFFFF) {
180 if (exfat_toupper(sb
, u_a
) != exfat_toupper(sb
, u_b
))
191 const struct dentry_operations exfat_utf8_dentry_ops
= {
192 .d_revalidate
= exfat_d_revalidate
,
193 .d_hash
= exfat_utf8_d_hash
,
194 .d_compare
= exfat_utf8_d_cmp
,
197 /* used only in search empty_slot() */
198 #define CNT_UNUSED_NOHIT (-1)
199 #define CNT_UNUSED_HIT (-2)
200 /* search EMPTY CONTINUOUS "num_entries" entries */
201 static int exfat_search_empty_slot(struct super_block
*sb
,
202 struct exfat_hint_femp
*hint_femp
, struct exfat_chain
*p_dir
,
205 int i
, dentry
, num_empty
= 0;
206 int dentries_per_clu
;
208 struct exfat_chain clu
;
209 struct exfat_dentry
*ep
;
210 struct exfat_sb_info
*sbi
= EXFAT_SB(sb
);
211 struct buffer_head
*bh
;
213 dentries_per_clu
= sbi
->dentries_per_clu
;
215 if (hint_femp
->eidx
!= EXFAT_HINT_NONE
) {
216 dentry
= hint_femp
->eidx
;
217 if (num_entries
<= hint_femp
->count
) {
218 hint_femp
->eidx
= EXFAT_HINT_NONE
;
222 exfat_chain_dup(&clu
, &hint_femp
->cur
);
224 exfat_chain_dup(&clu
, p_dir
);
228 while (clu
.dir
!= EXFAT_EOF_CLUSTER
) {
229 i
= dentry
& (dentries_per_clu
- 1);
231 for (; i
< dentries_per_clu
; i
++, dentry
++) {
232 ep
= exfat_get_dentry(sb
, &clu
, i
, &bh
, NULL
);
235 type
= exfat_get_entry_type(ep
);
238 if (type
== TYPE_UNUSED
|| type
== TYPE_DELETED
) {
240 if (hint_femp
->eidx
== EXFAT_HINT_NONE
) {
241 hint_femp
->eidx
= dentry
;
242 hint_femp
->count
= CNT_UNUSED_NOHIT
;
243 exfat_chain_set(&hint_femp
->cur
,
244 clu
.dir
, clu
.size
, clu
.flags
);
247 if (type
== TYPE_UNUSED
&&
248 hint_femp
->count
!= CNT_UNUSED_HIT
)
249 hint_femp
->count
= CNT_UNUSED_HIT
;
251 if (hint_femp
->eidx
!= EXFAT_HINT_NONE
&&
252 hint_femp
->count
== CNT_UNUSED_HIT
) {
253 /* unused empty group means
254 * an empty group which includes
258 "found bogus dentry(%d) beyond unused empty group(%d) (start_clu : %u, cur_clu : %u)",
259 dentry
, hint_femp
->eidx
,
260 p_dir
->dir
, clu
.dir
);
265 hint_femp
->eidx
= EXFAT_HINT_NONE
;
268 if (num_empty
>= num_entries
) {
269 /* found and invalidate hint_femp */
270 hint_femp
->eidx
= EXFAT_HINT_NONE
;
271 return (dentry
- (num_entries
- 1));
275 if (clu
.flags
== ALLOC_NO_FAT_CHAIN
) {
279 clu
.dir
= EXFAT_EOF_CLUSTER
;
281 if (exfat_get_next_cluster(sb
, &clu
.dir
))
289 static int exfat_check_max_dentries(struct inode
*inode
)
291 if (EXFAT_B_TO_DEN(i_size_read(inode
)) >= MAX_EXFAT_DENTRIES
) {
293 * exFAT spec allows a dir to grow up to 8388608(256MB)
301 /* find empty directory entry.
302 * if there isn't any empty slot, expand cluster chain.
304 static int exfat_find_empty_entry(struct inode
*inode
,
305 struct exfat_chain
*p_dir
, int num_entries
)
308 unsigned int ret
, last_clu
;
311 struct exfat_chain clu
;
312 struct exfat_dentry
*ep
= NULL
;
313 struct super_block
*sb
= inode
->i_sb
;
314 struct exfat_sb_info
*sbi
= EXFAT_SB(sb
);
315 struct exfat_inode_info
*ei
= EXFAT_I(inode
);
316 struct exfat_hint_femp hint_femp
;
318 hint_femp
.eidx
= EXFAT_HINT_NONE
;
320 if (ei
->hint_femp
.eidx
!= EXFAT_HINT_NONE
) {
321 hint_femp
= ei
->hint_femp
;
322 ei
->hint_femp
.eidx
= EXFAT_HINT_NONE
;
325 while ((dentry
= exfat_search_empty_slot(sb
, &hint_femp
, p_dir
,
330 if (exfat_check_max_dentries(inode
))
333 /* we trust p_dir->size regardless of FAT type */
334 if (exfat_find_last_cluster(sb
, p_dir
, &last_clu
))
338 * Allocate new cluster to this directory
340 exfat_chain_set(&clu
, last_clu
+ 1, 0, p_dir
->flags
);
342 /* allocate a cluster */
343 ret
= exfat_alloc_cluster(inode
, 1, &clu
, IS_DIRSYNC(inode
));
347 if (exfat_zeroed_cluster(inode
, clu
.dir
))
350 /* append to the FAT chain */
351 if (clu
.flags
!= p_dir
->flags
) {
352 /* no-fat-chain bit is disabled,
353 * so fat-chain should be synced with alloc-bitmap
355 exfat_chain_cont_cluster(sb
, p_dir
->dir
, p_dir
->size
);
356 p_dir
->flags
= ALLOC_FAT_CHAIN
;
357 hint_femp
.cur
.flags
= ALLOC_FAT_CHAIN
;
360 if (clu
.flags
== ALLOC_FAT_CHAIN
)
361 if (exfat_ent_set(sb
, last_clu
, clu
.dir
))
364 if (hint_femp
.eidx
== EXFAT_HINT_NONE
) {
365 /* the special case that new dentry
366 * should be allocated from the start of new cluster
368 hint_femp
.eidx
= EXFAT_B_TO_DEN_IDX(p_dir
->size
, sbi
);
369 hint_femp
.count
= sbi
->dentries_per_clu
;
371 exfat_chain_set(&hint_femp
.cur
, clu
.dir
, 0, clu
.flags
);
373 hint_femp
.cur
.size
++;
375 size
= EXFAT_CLU_TO_B(p_dir
->size
, sbi
);
377 /* update the directory entry */
378 if (p_dir
->dir
!= sbi
->root_dir
) {
379 struct buffer_head
*bh
;
381 ep
= exfat_get_dentry(sb
,
382 &(ei
->dir
), ei
->entry
+ 1, &bh
, §or
);
386 ep
->dentry
.stream
.valid_size
= cpu_to_le64(size
);
387 ep
->dentry
.stream
.size
= ep
->dentry
.stream
.valid_size
;
388 ep
->dentry
.stream
.flags
= p_dir
->flags
;
389 exfat_update_bh(bh
, IS_DIRSYNC(inode
));
391 if (exfat_update_dir_chksum(inode
, &(ei
->dir
),
396 /* directory inode should be updated in here */
397 i_size_write(inode
, size
);
398 EXFAT_I(inode
)->i_size_ondisk
+= sbi
->cluster_size
;
399 EXFAT_I(inode
)->i_size_aligned
+= sbi
->cluster_size
;
400 EXFAT_I(inode
)->flags
= p_dir
->flags
;
401 inode
->i_blocks
+= 1 << sbi
->sect_per_clus_bits
;
408 * Name Resolution Functions :
409 * Zero if it was successful; otherwise nonzero.
411 static int __exfat_resolve_path(struct inode
*inode
, const unsigned char *path
,
412 struct exfat_chain
*p_dir
, struct exfat_uni_name
*p_uniname
,
416 int lossy
= NLS_NAME_NO_LOSSY
;
417 struct super_block
*sb
= inode
->i_sb
;
418 struct exfat_sb_info
*sbi
= EXFAT_SB(sb
);
419 struct exfat_inode_info
*ei
= EXFAT_I(inode
);
421 /* strip all trailing periods */
422 namelen
= exfat_striptail_len(strlen(path
), path
);
426 if (strlen(path
) > (MAX_NAME_LENGTH
* MAX_CHARSET_SIZE
))
427 return -ENAMETOOLONG
;
430 * strip all leading spaces :
431 * "MS windows 7" supports leading spaces.
432 * So we should skip this preprocessing for compatibility.
435 /* file name conversion :
436 * If lookup case, we allow bad-name for compatibility.
438 namelen
= exfat_nls_to_utf16(sb
, path
, namelen
, p_uniname
,
441 return namelen
; /* return error value */
443 if ((lossy
&& !lookup
) || !namelen
)
446 exfat_chain_set(p_dir
, ei
->start_clu
,
447 EXFAT_B_TO_CLU(i_size_read(inode
), sbi
), ei
->flags
);
452 static inline int exfat_resolve_path(struct inode
*inode
,
453 const unsigned char *path
, struct exfat_chain
*dir
,
454 struct exfat_uni_name
*uni
)
456 return __exfat_resolve_path(inode
, path
, dir
, uni
, 0);
459 static inline int exfat_resolve_path_for_lookup(struct inode
*inode
,
460 const unsigned char *path
, struct exfat_chain
*dir
,
461 struct exfat_uni_name
*uni
)
463 return __exfat_resolve_path(inode
, path
, dir
, uni
, 1);
466 static inline loff_t
exfat_make_i_pos(struct exfat_dir_entry
*info
)
468 return ((loff_t
) info
->dir
.dir
<< 32) | (info
->entry
& 0xffffffff);
471 static int exfat_add_entry(struct inode
*inode
, const char *path
,
472 struct exfat_chain
*p_dir
, unsigned int type
,
473 struct exfat_dir_entry
*info
)
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
;
481 unsigned int start_clu
= EXFAT_FREE_CLUSTER
;
483 ret
= exfat_resolve_path(inode
, path
, p_dir
, &uniname
);
487 num_entries
= exfat_calc_num_entries(&uniname
);
488 if (num_entries
< 0) {
493 /* exfat_find_empty_entry must be called before alloc_cluster() */
494 dentry
= exfat_find_empty_entry(inode
, p_dir
, num_entries
);
496 ret
= dentry
; /* -EIO or -ENOSPC */
500 if (type
== TYPE_DIR
) {
501 ret
= exfat_alloc_new_dir(inode
, &clu
);
505 clu_size
= sbi
->cluster_size
;
508 /* update the directory entry */
509 /* fill the dos name directory entry information of the created file.
510 * the first cluster is not determined yet. (0)
512 ret
= exfat_init_dir_entry(inode
, p_dir
, dentry
, type
,
513 start_clu
, clu_size
);
517 ret
= exfat_init_ext_entry(inode
, p_dir
, dentry
, num_entries
, &uniname
);
522 info
->entry
= dentry
;
523 info
->flags
= ALLOC_NO_FAT_CHAIN
;
526 if (type
== TYPE_FILE
) {
527 info
->attr
= ATTR_ARCHIVE
;
528 info
->start_clu
= EXFAT_EOF_CLUSTER
;
530 info
->num_subdirs
= 0;
532 info
->attr
= ATTR_SUBDIR
;
533 info
->start_clu
= start_clu
;
534 info
->size
= clu_size
;
535 info
->num_subdirs
= EXFAT_MIN_SUBDIR
;
537 memset(&info
->crtime
, 0, sizeof(info
->crtime
));
538 memset(&info
->mtime
, 0, sizeof(info
->mtime
));
539 memset(&info
->atime
, 0, sizeof(info
->atime
));
544 static int exfat_create(struct user_namespace
*mnt_userns
, struct inode
*dir
,
545 struct dentry
*dentry
, umode_t mode
, bool excl
)
547 struct super_block
*sb
= dir
->i_sb
;
549 struct exfat_chain cdir
;
550 struct exfat_dir_entry info
;
554 mutex_lock(&EXFAT_SB(sb
)->s_lock
);
555 exfat_set_volume_dirty(sb
);
556 err
= exfat_add_entry(dir
, dentry
->d_name
.name
, &cdir
, TYPE_FILE
,
558 exfat_clear_volume_dirty(sb
);
562 inode_inc_iversion(dir
);
563 dir
->i_ctime
= dir
->i_mtime
= current_time(dir
);
565 exfat_sync_inode(dir
);
567 mark_inode_dirty(dir
);
569 i_pos
= exfat_make_i_pos(&info
);
570 inode
= exfat_build_inode(sb
, &info
, i_pos
);
571 err
= PTR_ERR_OR_ZERO(inode
);
575 inode_inc_iversion(inode
);
576 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
=
577 EXFAT_I(inode
)->i_crtime
= current_time(inode
);
578 exfat_truncate_atime(&inode
->i_atime
);
579 /* timestamp is already written, so mark_inode_dirty() is unneeded. */
581 d_instantiate(dentry
, inode
);
583 mutex_unlock(&EXFAT_SB(sb
)->s_lock
);
588 static int exfat_find(struct inode
*dir
, struct qstr
*qname
,
589 struct exfat_dir_entry
*info
)
591 int ret
, dentry
, num_entries
, count
;
592 struct exfat_chain cdir
;
593 struct exfat_uni_name uni_name
;
594 struct super_block
*sb
= dir
->i_sb
;
595 struct exfat_sb_info
*sbi
= EXFAT_SB(sb
);
596 struct exfat_inode_info
*ei
= EXFAT_I(dir
);
597 struct exfat_dentry
*ep
, *ep2
;
598 struct exfat_entry_set_cache
*es
;
599 /* for optimized dir & entry to prevent long traverse of cluster chain */
600 struct exfat_hint hint_opt
;
605 /* check the validity of directory name in the given pathname */
606 ret
= exfat_resolve_path_for_lookup(dir
, qname
->name
, &cdir
, &uni_name
);
610 num_entries
= exfat_calc_num_entries(&uni_name
);
614 /* check the validation of hint_stat and initialize it if required */
615 if (ei
->version
!= (inode_peek_iversion_raw(dir
) & 0xffffffff)) {
616 ei
->hint_stat
.clu
= cdir
.dir
;
617 ei
->hint_stat
.eidx
= 0;
618 ei
->version
= (inode_peek_iversion_raw(dir
) & 0xffffffff);
619 ei
->hint_femp
.eidx
= EXFAT_HINT_NONE
;
622 /* search the file name for directories */
623 dentry
= exfat_find_dir_entry(sb
, ei
, &cdir
, &uni_name
,
624 num_entries
, TYPE_ALL
, &hint_opt
);
627 return dentry
; /* -error value */
630 info
->entry
= dentry
;
631 info
->num_subdirs
= 0;
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 es
= exfat_get_dentry_set(sb
, &cdir
, dentry
, ES_2_ENTRIES
);
641 ep
= exfat_get_dentry_cached(es
, 0);
642 ep2
= exfat_get_dentry_cached(es
, 1);
644 info
->type
= exfat_get_entry_type(ep
);
645 info
->attr
= le16_to_cpu(ep
->dentry
.file
.attr
);
646 info
->size
= le64_to_cpu(ep2
->dentry
.stream
.valid_size
);
647 if ((info
->type
== TYPE_FILE
) && (info
->size
== 0)) {
648 info
->flags
= ALLOC_NO_FAT_CHAIN
;
649 info
->start_clu
= EXFAT_EOF_CLUSTER
;
651 info
->flags
= ep2
->dentry
.stream
.flags
;
653 le32_to_cpu(ep2
->dentry
.stream
.start_clu
);
656 exfat_get_entry_time(sbi
, &info
->crtime
,
657 ep
->dentry
.file
.create_tz
,
658 ep
->dentry
.file
.create_time
,
659 ep
->dentry
.file
.create_date
,
660 ep
->dentry
.file
.create_time_cs
);
661 exfat_get_entry_time(sbi
, &info
->mtime
,
662 ep
->dentry
.file
.modify_tz
,
663 ep
->dentry
.file
.modify_time
,
664 ep
->dentry
.file
.modify_date
,
665 ep
->dentry
.file
.modify_time_cs
);
666 exfat_get_entry_time(sbi
, &info
->atime
,
667 ep
->dentry
.file
.access_tz
,
668 ep
->dentry
.file
.access_time
,
669 ep
->dentry
.file
.access_date
,
671 exfat_free_dentry_set(es
, false);
673 if (ei
->start_clu
== EXFAT_FREE_CLUSTER
) {
675 "non-zero size file starts with zero cluster (size : %llu, p_dir : %u, entry : 0x%08x)",
676 i_size_read(dir
), ei
->dir
.dir
, ei
->entry
);
680 if (info
->type
== TYPE_DIR
) {
681 exfat_chain_set(&cdir
, info
->start_clu
,
682 EXFAT_B_TO_CLU(info
->size
, sbi
), info
->flags
);
683 count
= exfat_count_dir_entries(sb
, &cdir
);
687 info
->num_subdirs
= count
+ EXFAT_MIN_SUBDIR
;
692 static int exfat_d_anon_disconn(struct dentry
*dentry
)
694 return IS_ROOT(dentry
) && (dentry
->d_flags
& DCACHE_DISCONNECTED
);
697 static struct dentry
*exfat_lookup(struct inode
*dir
, struct dentry
*dentry
,
700 struct super_block
*sb
= dir
->i_sb
;
702 struct dentry
*alias
;
703 struct exfat_dir_entry info
;
708 mutex_lock(&EXFAT_SB(sb
)->s_lock
);
709 err
= exfat_find(dir
, &dentry
->d_name
, &info
);
711 if (err
== -ENOENT
) {
718 i_pos
= exfat_make_i_pos(&info
);
719 inode
= exfat_build_inode(sb
, &info
, i_pos
);
720 err
= PTR_ERR_OR_ZERO(inode
);
724 i_mode
= inode
->i_mode
;
725 alias
= d_find_alias(inode
);
728 * Checking "alias->d_parent == dentry->d_parent" to make sure
729 * FS is not corrupted (especially double linked dir).
731 if (alias
&& alias
->d_parent
== dentry
->d_parent
&&
732 !exfat_d_anon_disconn(alias
)) {
735 * Unhashed alias is able to exist because of revalidate()
736 * called by lookup_fast. You can easily make this status
737 * by calling create and lookup concurrently
738 * In such case, we reuse an alias instead of new dentry
740 if (d_unhashed(alias
)) {
741 WARN_ON(alias
->d_name
.hash_len
!=
742 dentry
->d_name
.hash_len
);
743 exfat_info(sb
, "rehashed a dentry(%p) in read lookup",
747 } else if (!S_ISDIR(i_mode
)) {
749 * This inode has non anonymous-DCACHE_DISCONNECTED
750 * dentry. This means, the user did ->lookup() by an
751 * another name (longname vs 8.3 alias of it) in past.
753 * Switch to new one for reason of locality if possible.
755 d_move(alias
, dentry
);
758 mutex_unlock(&EXFAT_SB(sb
)->s_lock
);
763 mutex_unlock(&EXFAT_SB(sb
)->s_lock
);
765 exfat_d_version_set(dentry
, inode_query_iversion(dir
));
767 return d_splice_alias(inode
, dentry
);
769 mutex_unlock(&EXFAT_SB(sb
)->s_lock
);
773 /* remove an entry, BUT don't truncate */
774 static int exfat_unlink(struct inode
*dir
, struct dentry
*dentry
)
776 struct exfat_chain cdir
;
777 struct exfat_dentry
*ep
;
778 struct super_block
*sb
= dir
->i_sb
;
779 struct inode
*inode
= dentry
->d_inode
;
780 struct exfat_inode_info
*ei
= EXFAT_I(inode
);
781 struct buffer_head
*bh
;
783 int num_entries
, entry
, err
= 0;
785 mutex_lock(&EXFAT_SB(sb
)->s_lock
);
786 exfat_chain_dup(&cdir
, &ei
->dir
);
788 if (ei
->dir
.dir
== DIR_DELETED
) {
789 exfat_err(sb
, "abnormal access to deleted dentry");
794 ep
= exfat_get_dentry(sb
, &cdir
, entry
, &bh
, §or
);
799 num_entries
= exfat_count_ext_entries(sb
, &cdir
, entry
, ep
);
800 if (num_entries
< 0) {
808 exfat_set_volume_dirty(sb
);
809 /* update the directory entry */
810 if (exfat_remove_entries(dir
, &cdir
, entry
, 0, num_entries
)) {
815 /* This doesn't modify ei */
816 ei
->dir
.dir
= DIR_DELETED
;
817 exfat_clear_volume_dirty(sb
);
819 inode_inc_iversion(dir
);
820 dir
->i_mtime
= dir
->i_atime
= current_time(dir
);
821 exfat_truncate_atime(&dir
->i_atime
);
823 exfat_sync_inode(dir
);
825 mark_inode_dirty(dir
);
828 inode
->i_mtime
= inode
->i_atime
= current_time(inode
);
829 exfat_truncate_atime(&inode
->i_atime
);
830 exfat_unhash_inode(inode
);
831 exfat_d_version_set(dentry
, inode_query_iversion(dir
));
833 mutex_unlock(&EXFAT_SB(sb
)->s_lock
);
837 static int exfat_mkdir(struct user_namespace
*mnt_userns
, struct inode
*dir
,
838 struct dentry
*dentry
, umode_t mode
)
840 struct super_block
*sb
= dir
->i_sb
;
842 struct exfat_dir_entry info
;
843 struct exfat_chain cdir
;
847 mutex_lock(&EXFAT_SB(sb
)->s_lock
);
848 exfat_set_volume_dirty(sb
);
849 err
= exfat_add_entry(dir
, dentry
->d_name
.name
, &cdir
, TYPE_DIR
,
851 exfat_clear_volume_dirty(sb
);
855 inode_inc_iversion(dir
);
856 dir
->i_ctime
= dir
->i_mtime
= current_time(dir
);
858 exfat_sync_inode(dir
);
860 mark_inode_dirty(dir
);
863 i_pos
= exfat_make_i_pos(&info
);
864 inode
= exfat_build_inode(sb
, &info
, i_pos
);
865 err
= PTR_ERR_OR_ZERO(inode
);
869 inode_inc_iversion(inode
);
870 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
=
871 EXFAT_I(inode
)->i_crtime
= current_time(inode
);
872 exfat_truncate_atime(&inode
->i_atime
);
873 /* timestamp is already written, so mark_inode_dirty() is unneeded. */
875 d_instantiate(dentry
, inode
);
878 mutex_unlock(&EXFAT_SB(sb
)->s_lock
);
882 static int exfat_check_dir_empty(struct super_block
*sb
,
883 struct exfat_chain
*p_dir
)
885 int i
, dentries_per_clu
;
887 struct exfat_chain clu
;
888 struct exfat_dentry
*ep
;
889 struct exfat_sb_info
*sbi
= EXFAT_SB(sb
);
890 struct buffer_head
*bh
;
892 dentries_per_clu
= sbi
->dentries_per_clu
;
894 exfat_chain_dup(&clu
, p_dir
);
896 while (clu
.dir
!= EXFAT_EOF_CLUSTER
) {
897 for (i
= 0; i
< dentries_per_clu
; i
++) {
898 ep
= exfat_get_dentry(sb
, &clu
, i
, &bh
, NULL
);
901 type
= exfat_get_entry_type(ep
);
903 if (type
== TYPE_UNUSED
)
906 if (type
!= TYPE_FILE
&& type
!= TYPE_DIR
)
912 if (clu
.flags
== ALLOC_NO_FAT_CHAIN
) {
916 clu
.dir
= EXFAT_EOF_CLUSTER
;
918 if (exfat_get_next_cluster(sb
, &(clu
.dir
)))
926 static int exfat_rmdir(struct inode
*dir
, struct dentry
*dentry
)
928 struct inode
*inode
= dentry
->d_inode
;
929 struct exfat_dentry
*ep
;
930 struct exfat_chain cdir
, clu_to_free
;
931 struct super_block
*sb
= inode
->i_sb
;
932 struct exfat_sb_info
*sbi
= EXFAT_SB(sb
);
933 struct exfat_inode_info
*ei
= EXFAT_I(inode
);
934 struct buffer_head
*bh
;
936 int num_entries
, entry
, err
;
938 mutex_lock(&EXFAT_SB(inode
->i_sb
)->s_lock
);
940 exfat_chain_dup(&cdir
, &ei
->dir
);
943 if (ei
->dir
.dir
== DIR_DELETED
) {
944 exfat_err(sb
, "abnormal access to deleted dentry");
949 exfat_chain_set(&clu_to_free
, ei
->start_clu
,
950 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(inode
), sbi
), ei
->flags
);
952 err
= exfat_check_dir_empty(sb
, &clu_to_free
);
955 exfat_err(sb
, "failed to exfat_check_dir_empty : err(%d)",
960 ep
= exfat_get_dentry(sb
, &cdir
, entry
, &bh
, §or
);
966 num_entries
= exfat_count_ext_entries(sb
, &cdir
, entry
, ep
);
967 if (num_entries
< 0) {
975 exfat_set_volume_dirty(sb
);
976 err
= exfat_remove_entries(dir
, &cdir
, entry
, 0, num_entries
);
978 exfat_err(sb
, "failed to exfat_remove_entries : err(%d)", err
);
981 ei
->dir
.dir
= DIR_DELETED
;
982 exfat_clear_volume_dirty(sb
);
984 inode_inc_iversion(dir
);
985 dir
->i_mtime
= dir
->i_atime
= current_time(dir
);
986 exfat_truncate_atime(&dir
->i_atime
);
988 exfat_sync_inode(dir
);
990 mark_inode_dirty(dir
);
994 inode
->i_mtime
= inode
->i_atime
= current_time(inode
);
995 exfat_truncate_atime(&inode
->i_atime
);
996 exfat_unhash_inode(inode
);
997 exfat_d_version_set(dentry
, inode_query_iversion(dir
));
999 mutex_unlock(&EXFAT_SB(inode
->i_sb
)->s_lock
);
1003 static int exfat_rename_file(struct inode
*inode
, struct exfat_chain
*p_dir
,
1004 int oldentry
, struct exfat_uni_name
*p_uniname
,
1005 struct exfat_inode_info
*ei
)
1007 int ret
, num_old_entries
, num_new_entries
;
1008 sector_t sector_old
, sector_new
;
1009 struct exfat_dentry
*epold
, *epnew
;
1010 struct super_block
*sb
= inode
->i_sb
;
1011 struct buffer_head
*new_bh
, *old_bh
;
1012 int sync
= IS_DIRSYNC(inode
);
1014 epold
= exfat_get_dentry(sb
, p_dir
, oldentry
, &old_bh
, §or_old
);
1018 num_old_entries
= exfat_count_ext_entries(sb
, p_dir
, oldentry
, epold
);
1019 if (num_old_entries
< 0)
1023 num_new_entries
= exfat_calc_num_entries(p_uniname
);
1024 if (num_new_entries
< 0)
1025 return num_new_entries
;
1027 if (num_old_entries
< num_new_entries
) {
1031 exfat_find_empty_entry(inode
, p_dir
, num_new_entries
);
1033 return newentry
; /* -EIO or -ENOSPC */
1035 epnew
= exfat_get_dentry(sb
, p_dir
, newentry
, &new_bh
,
1041 if (exfat_get_entry_type(epnew
) == TYPE_FILE
) {
1042 epnew
->dentry
.file
.attr
|= cpu_to_le16(ATTR_ARCHIVE
);
1043 ei
->attr
|= ATTR_ARCHIVE
;
1045 exfat_update_bh(new_bh
, sync
);
1049 epold
= exfat_get_dentry(sb
, p_dir
, oldentry
+ 1, &old_bh
,
1053 epnew
= exfat_get_dentry(sb
, p_dir
, newentry
+ 1, &new_bh
,
1061 exfat_update_bh(new_bh
, sync
);
1065 ret
= exfat_init_ext_entry(inode
, p_dir
, newentry
,
1066 num_new_entries
, p_uniname
);
1070 exfat_remove_entries(inode
, p_dir
, oldentry
, 0,
1072 ei
->entry
= newentry
;
1074 if (exfat_get_entry_type(epold
) == TYPE_FILE
) {
1075 epold
->dentry
.file
.attr
|= cpu_to_le16(ATTR_ARCHIVE
);
1076 ei
->attr
|= ATTR_ARCHIVE
;
1078 exfat_update_bh(old_bh
, sync
);
1080 ret
= exfat_init_ext_entry(inode
, p_dir
, oldentry
,
1081 num_new_entries
, p_uniname
);
1085 exfat_remove_entries(inode
, p_dir
, oldentry
, num_new_entries
,
1091 static int exfat_move_file(struct inode
*inode
, struct exfat_chain
*p_olddir
,
1092 int oldentry
, struct exfat_chain
*p_newdir
,
1093 struct exfat_uni_name
*p_uniname
, struct exfat_inode_info
*ei
)
1095 int ret
, newentry
, num_new_entries
, num_old_entries
;
1096 sector_t sector_mov
, sector_new
;
1097 struct exfat_dentry
*epmov
, *epnew
;
1098 struct super_block
*sb
= inode
->i_sb
;
1099 struct buffer_head
*mov_bh
, *new_bh
;
1101 epmov
= exfat_get_dentry(sb
, p_olddir
, oldentry
, &mov_bh
, §or_mov
);
1105 num_old_entries
= exfat_count_ext_entries(sb
, p_olddir
, oldentry
,
1107 if (num_old_entries
< 0)
1111 num_new_entries
= exfat_calc_num_entries(p_uniname
);
1112 if (num_new_entries
< 0)
1113 return num_new_entries
;
1115 newentry
= exfat_find_empty_entry(inode
, p_newdir
, num_new_entries
);
1117 return newentry
; /* -EIO or -ENOSPC */
1119 epnew
= exfat_get_dentry(sb
, p_newdir
, newentry
, &new_bh
, §or_new
);
1124 if (exfat_get_entry_type(epnew
) == TYPE_FILE
) {
1125 epnew
->dentry
.file
.attr
|= cpu_to_le16(ATTR_ARCHIVE
);
1126 ei
->attr
|= ATTR_ARCHIVE
;
1128 exfat_update_bh(new_bh
, IS_DIRSYNC(inode
));
1132 epmov
= exfat_get_dentry(sb
, p_olddir
, oldentry
+ 1, &mov_bh
,
1136 epnew
= exfat_get_dentry(sb
, p_newdir
, newentry
+ 1, &new_bh
,
1144 exfat_update_bh(new_bh
, IS_DIRSYNC(inode
));
1148 ret
= exfat_init_ext_entry(inode
, p_newdir
, newentry
, num_new_entries
,
1153 exfat_remove_entries(inode
, p_olddir
, oldentry
, 0, num_old_entries
);
1155 exfat_chain_set(&ei
->dir
, p_newdir
->dir
, p_newdir
->size
,
1158 ei
->entry
= newentry
;
1162 static void exfat_update_parent_info(struct exfat_inode_info
*ei
,
1163 struct inode
*parent_inode
)
1165 struct exfat_sb_info
*sbi
= EXFAT_SB(parent_inode
->i_sb
);
1166 struct exfat_inode_info
*parent_ei
= EXFAT_I(parent_inode
);
1167 loff_t parent_isize
= i_size_read(parent_inode
);
1170 * the problem that struct exfat_inode_info caches wrong parent info.
1172 * because of flag-mismatch of ei->dir,
1173 * there is abnormal traversing cluster chain.
1175 if (unlikely(parent_ei
->flags
!= ei
->dir
.flags
||
1176 parent_isize
!= EXFAT_CLU_TO_B(ei
->dir
.size
, sbi
) ||
1177 parent_ei
->start_clu
!= ei
->dir
.dir
)) {
1178 exfat_chain_set(&ei
->dir
, parent_ei
->start_clu
,
1179 EXFAT_B_TO_CLU_ROUND_UP(parent_isize
, sbi
),
1184 /* rename or move a old file into a new file */
1185 static int __exfat_rename(struct inode
*old_parent_inode
,
1186 struct exfat_inode_info
*ei
, struct inode
*new_parent_inode
,
1187 struct dentry
*new_dentry
)
1191 struct exfat_chain olddir
, newdir
;
1192 struct exfat_chain
*p_dir
= NULL
;
1193 struct exfat_uni_name uni_name
;
1194 struct exfat_dentry
*ep
;
1195 struct super_block
*sb
= old_parent_inode
->i_sb
;
1196 struct exfat_sb_info
*sbi
= EXFAT_SB(sb
);
1197 const unsigned char *new_path
= new_dentry
->d_name
.name
;
1198 struct inode
*new_inode
= new_dentry
->d_inode
;
1200 struct exfat_inode_info
*new_ei
= NULL
;
1201 unsigned int new_entry_type
= TYPE_UNUSED
;
1203 struct buffer_head
*old_bh
, *new_bh
= NULL
;
1205 /* check the validity of pointer parameters */
1206 if (new_path
== NULL
|| strlen(new_path
) == 0)
1209 if (ei
->dir
.dir
== DIR_DELETED
) {
1210 exfat_err(sb
, "abnormal access to deleted source dentry");
1214 exfat_update_parent_info(ei
, old_parent_inode
);
1216 exfat_chain_dup(&olddir
, &ei
->dir
);
1219 ep
= exfat_get_dentry(sb
, &olddir
, dentry
, &old_bh
, NULL
);
1226 /* check whether new dir is existing directory and empty */
1229 new_ei
= EXFAT_I(new_inode
);
1231 if (new_ei
->dir
.dir
== DIR_DELETED
) {
1232 exfat_err(sb
, "abnormal access to deleted target dentry");
1236 exfat_update_parent_info(new_ei
, new_parent_inode
);
1238 p_dir
= &(new_ei
->dir
);
1239 new_entry
= new_ei
->entry
;
1240 ep
= exfat_get_dentry(sb
, p_dir
, new_entry
, &new_bh
, NULL
);
1244 new_entry_type
= exfat_get_entry_type(ep
);
1247 /* if new_inode exists, update ei */
1248 if (new_entry_type
== TYPE_DIR
) {
1249 struct exfat_chain new_clu
;
1251 new_clu
.dir
= new_ei
->start_clu
;
1253 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(new_inode
),
1255 new_clu
.flags
= new_ei
->flags
;
1257 ret
= exfat_check_dir_empty(sb
, &new_clu
);
1263 /* check the validity of directory name in the given new pathname */
1264 ret
= exfat_resolve_path(new_parent_inode
, new_path
, &newdir
,
1269 exfat_set_volume_dirty(sb
);
1271 if (olddir
.dir
== newdir
.dir
)
1272 ret
= exfat_rename_file(new_parent_inode
, &olddir
, dentry
,
1275 ret
= exfat_move_file(new_parent_inode
, &olddir
, dentry
,
1276 &newdir
, &uni_name
, ei
);
1278 if (!ret
&& new_inode
) {
1279 /* delete entries of new_dir */
1280 ep
= exfat_get_dentry(sb
, p_dir
, new_entry
, &new_bh
, NULL
);
1286 num_entries
= exfat_count_ext_entries(sb
, p_dir
, new_entry
, ep
);
1287 if (num_entries
< 0) {
1293 if (exfat_remove_entries(new_inode
, p_dir
, new_entry
, 0,
1299 /* Free the clusters if new_inode is a dir(as if exfat_rmdir) */
1300 if (new_entry_type
== TYPE_DIR
) {
1301 /* new_ei, new_clu_to_free */
1302 struct exfat_chain new_clu_to_free
;
1304 exfat_chain_set(&new_clu_to_free
, new_ei
->start_clu
,
1305 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(new_inode
),
1306 sbi
), new_ei
->flags
);
1308 if (exfat_free_cluster(new_inode
, &new_clu_to_free
)) {
1309 /* just set I/O error only */
1313 i_size_write(new_inode
, 0);
1314 new_ei
->start_clu
= EXFAT_EOF_CLUSTER
;
1315 new_ei
->flags
= ALLOC_NO_FAT_CHAIN
;
1318 /* Update new_inode ei
1319 * Prevent syncing removed new_inode
1320 * (new_ei is already initialized above code ("if (new_inode)")
1322 new_ei
->dir
.dir
= DIR_DELETED
;
1324 exfat_clear_volume_dirty(sb
);
1329 static int exfat_rename(struct user_namespace
*mnt_userns
,
1330 struct inode
*old_dir
, struct dentry
*old_dentry
,
1331 struct inode
*new_dir
, struct dentry
*new_dentry
,
1334 struct inode
*old_inode
, *new_inode
;
1335 struct super_block
*sb
= old_dir
->i_sb
;
1340 * The VFS already checks for existence, so for local filesystems
1341 * the RENAME_NOREPLACE implementation is equivalent to plain rename.
1342 * Don't support any other flags
1344 if (flags
& ~RENAME_NOREPLACE
)
1347 mutex_lock(&EXFAT_SB(sb
)->s_lock
);
1348 old_inode
= old_dentry
->d_inode
;
1349 new_inode
= new_dentry
->d_inode
;
1351 err
= __exfat_rename(old_dir
, EXFAT_I(old_inode
), new_dir
, new_dentry
);
1355 inode_inc_iversion(new_dir
);
1356 new_dir
->i_ctime
= new_dir
->i_mtime
= new_dir
->i_atime
=
1357 EXFAT_I(new_dir
)->i_crtime
= current_time(new_dir
);
1358 exfat_truncate_atime(&new_dir
->i_atime
);
1359 if (IS_DIRSYNC(new_dir
))
1360 exfat_sync_inode(new_dir
);
1362 mark_inode_dirty(new_dir
);
1364 i_pos
= ((loff_t
)EXFAT_I(old_inode
)->dir
.dir
<< 32) |
1365 (EXFAT_I(old_inode
)->entry
& 0xffffffff);
1366 exfat_unhash_inode(old_inode
);
1367 exfat_hash_inode(old_inode
, i_pos
);
1368 if (IS_DIRSYNC(new_dir
))
1369 exfat_sync_inode(old_inode
);
1371 mark_inode_dirty(old_inode
);
1373 if (S_ISDIR(old_inode
->i_mode
) && old_dir
!= new_dir
) {
1374 drop_nlink(old_dir
);
1379 inode_inc_iversion(old_dir
);
1380 old_dir
->i_ctime
= old_dir
->i_mtime
= current_time(old_dir
);
1381 if (IS_DIRSYNC(old_dir
))
1382 exfat_sync_inode(old_dir
);
1384 mark_inode_dirty(old_dir
);
1387 exfat_unhash_inode(new_inode
);
1389 /* skip drop_nlink if new_inode already has been dropped */
1390 if (new_inode
->i_nlink
) {
1391 drop_nlink(new_inode
);
1392 if (S_ISDIR(new_inode
->i_mode
))
1393 drop_nlink(new_inode
);
1395 exfat_warn(sb
, "abnormal access to an inode dropped");
1396 WARN_ON(new_inode
->i_nlink
== 0);
1398 new_inode
->i_ctime
= EXFAT_I(new_inode
)->i_crtime
=
1399 current_time(new_inode
);
1403 mutex_unlock(&EXFAT_SB(sb
)->s_lock
);
1407 const struct inode_operations exfat_dir_inode_operations
= {
1408 .create
= exfat_create
,
1409 .lookup
= exfat_lookup
,
1410 .unlink
= exfat_unlink
,
1411 .mkdir
= exfat_mkdir
,
1412 .rmdir
= exfat_rmdir
,
1413 .rename
= exfat_rename
,
1414 .setattr
= exfat_setattr
,
1415 .getattr
= exfat_getattr
,