[PATCH v4 1/5] exfat: integrates dir-entry getting and validation

From: Tetsuhiro Kohada
Date: Wed Aug 26 2020 - 07:58:03 EST

Add validation for num, bh and type on getting dir-entry.
Renamed exfat_get_dentry_cached() to exfat_get_validated_dentry() due to
a change in functionality.

Integrate type-validation with simplified.
This will also recognize a dir-entry set that contains 'benign secondary'
dir-entries.

Pre-Validated 'file' and 'stream-ext' dir-entries are provided via
ES_FILE/ES_STREAM macros.

And, rename TYPE_EXTEND to TYPE_NAME.

Suggested-by: Sungjong Seo <sj1557.seo@xxxxxxxxxxx>
Suggested-by: Namjae Jeon <namjae.jeon@xxxxxxxxxxx>
Signed-off-by: Tetsuhiro Kohada <kohada.t2@xxxxxxxxx>
---
Changes in v2
- Change verification order
- Verification loop start with index 2
Changes in v3
- Fix indent
- Fix comment of exfat_get_dentry_set()
- Add de_file/de_stream in exfat_entry_set_cache
- Add srtuct tag name for each dir-entry type in exfat_dentry
- Add description about de_file/de_stream to commit-log
Changes in v4
- Replace de_file/de_stream with ep_file/ep_stream in exfat_entry_set_cache
- Remove srtuct tag names added in v3
- Add ES_INDEX_XXX macro definitions
- Add ES_FILE/ES_STREAM macro definitions
- Replace some EXFAT_FIRST_CLUSTER with ES_INDEX_NAME
- Modify commit-log

fs/exfat/dir.c | 155 ++++++++++++++++++-------------------------
fs/exfat/exfat_fs.h | 19 ++++--
fs/exfat/exfat_raw.h | 14 ++--
fs/exfat/file.c | 25 +++----
fs/exfat/inode.c | 49 ++++++--------
fs/exfat/namei.c | 36 +++++-----
6 files changed, 132 insertions(+), 166 deletions(-)

diff --git a/fs/exfat/dir.c b/fs/exfat/dir.c
index 573659bfbc55..bb3c20bac422 100644
--- a/fs/exfat/dir.c
+++ b/fs/exfat/dir.c
@@ -33,6 +33,7 @@ static void exfat_get_uniname_from_ext_entry(struct super_block *sb,
{
int i;
struct exfat_entry_set_cache *es;
+ struct exfat_dentry *ep;

es = exfat_get_dentry_set(sb, p_dir, entry, ES_ALL_ENTRIES);
if (!es)
@@ -44,13 +45,9 @@ static void exfat_get_uniname_from_ext_entry(struct super_block *sb,
* Third entry : first file-name entry
* So, the index of first file-name dentry should start from 2.
*/
- for (i = 2; i < es->num_entries; i++) {
- struct exfat_dentry *ep = exfat_get_dentry_cached(es, i);
-
- /* end of name entry */
- if (exfat_get_entry_type(ep) != TYPE_EXTEND)
- break;

+ i = ES_INDEX_NAME;
+ while ((ep = exfat_get_validated_dentry(es, i++, TYPE_NAME))) {
exfat_extract_uni_name(ep, uniname);
uniname += EXFAT_FILE_NAME_LEN;
}
@@ -372,7 +369,7 @@ unsigned int exfat_get_entry_type(struct exfat_dentry *ep)
if (ep->type == EXFAT_STREAM)
return TYPE_STREAM;
if (ep->type == EXFAT_NAME)
- return TYPE_EXTEND;
+ return TYPE_NAME;
if (ep->type == EXFAT_ACL)
return TYPE_ACL;
return TYPE_CRITICAL_SEC;
@@ -388,7 +385,7 @@ static void exfat_set_entry_type(struct exfat_dentry *ep, unsigned int type)
ep->type &= EXFAT_DELETE;
} else if (type == TYPE_STREAM) {
ep->type = EXFAT_STREAM;
- } else if (type == TYPE_EXTEND) {
+ } else if (type == TYPE_NAME) {
ep->type = EXFAT_NAME;
} else if (type == TYPE_BITMAP) {
ep->type = EXFAT_BITMAP;
@@ -421,7 +418,7 @@ static void exfat_init_name_entry(struct exfat_dentry *ep,
{
int i;

- exfat_set_entry_type(ep, TYPE_EXTEND);
+ exfat_set_entry_type(ep, TYPE_NAME);
ep->dentry.name.flags = 0x0;

for (i = 0; i < EXFAT_FILE_NAME_LEN; i++) {
@@ -550,7 +547,7 @@ int exfat_init_ext_entry(struct inode *inode, struct exfat_chain *p_dir,
exfat_update_bh(bh, sync);
brelse(bh);

- for (i = EXFAT_FIRST_CLUSTER; i < num_entries; i++) {
+ for (i = ES_INDEX_NAME; i < num_entries; i++) {
ep = exfat_get_dentry(sb, p_dir, entry + i, &bh, &sector);
if (!ep)
return -EIO;
@@ -590,17 +587,16 @@ int exfat_remove_entries(struct inode *inode, struct exfat_chain *p_dir,
void exfat_update_dir_chksum_with_entry_set(struct exfat_entry_set_cache *es)
{
int chksum_type = CS_DIR_ENTRY, i;
- unsigned short chksum = 0;
+ u16 chksum = 0;
struct exfat_dentry *ep;

for (i = 0; i < es->num_entries; i++) {
- ep = exfat_get_dentry_cached(es, i);
+ ep = exfat_get_validated_dentry(es, i, TYPE_ALL);
chksum = exfat_calc_chksum16(ep, DENTRY_SIZE, chksum,
chksum_type);
chksum_type = CS_DEFAULT;
}
- ep = exfat_get_dentry_cached(es, 0);
- ep->dentry.file.checksum = cpu_to_le16(chksum);
+ ES_FILE(es).checksum = cpu_to_le16(chksum);
es->modified = true;
}

@@ -741,92 +737,63 @@ struct exfat_dentry *exfat_get_dentry(struct super_block *sb,
return (struct exfat_dentry *)((*bh)->b_data + off);
}

-enum exfat_validate_dentry_mode {
- ES_MODE_STARTED,
- ES_MODE_GET_FILE_ENTRY,
- ES_MODE_GET_STRM_ENTRY,
- ES_MODE_GET_NAME_ENTRY,
- ES_MODE_GET_CRITICAL_SEC_ENTRY,
-};
-
-static bool exfat_validate_entry(unsigned int type,
- enum exfat_validate_dentry_mode *mode)
-{
- if (type == TYPE_UNUSED || type == TYPE_DELETED)
- return false;
-
- switch (*mode) {
- case ES_MODE_STARTED:
- if (type != TYPE_FILE && type != TYPE_DIR)
- return false;
- *mode = ES_MODE_GET_FILE_ENTRY;
- return true;
- case ES_MODE_GET_FILE_ENTRY:
- if (type != TYPE_STREAM)
- return false;
- *mode = ES_MODE_GET_STRM_ENTRY;
- return true;
- case ES_MODE_GET_STRM_ENTRY:
- if (type != TYPE_EXTEND)
- return false;
- *mode = ES_MODE_GET_NAME_ENTRY;
- return true;
- case ES_MODE_GET_NAME_ENTRY:
- if (type == TYPE_STREAM)
- return false;
- if (type != TYPE_EXTEND) {
- if (!(type & TYPE_CRITICAL_SEC))
- return false;
- *mode = ES_MODE_GET_CRITICAL_SEC_ENTRY;
- }
- return true;
- case ES_MODE_GET_CRITICAL_SEC_ENTRY:
- if (type == TYPE_EXTEND || type == TYPE_STREAM)
- return false;
- if ((type & TYPE_CRITICAL_SEC) != TYPE_CRITICAL_SEC)
- return false;
- return true;
- default:
- WARN_ON_ONCE(1);
- return false;
- }
-}
-
-struct exfat_dentry *exfat_get_dentry_cached(
- struct exfat_entry_set_cache *es, int num)
+struct exfat_dentry *exfat_get_validated_dentry(struct exfat_entry_set_cache *es,
+ int num, unsigned int type)
{
int off = es->start_off + num * DENTRY_SIZE;
- struct buffer_head *bh = es->bh[EXFAT_B_TO_BLK(off, es->sb)];
- char *p = bh->b_data + EXFAT_BLK_OFFSET(off, es->sb);
+ struct buffer_head *bh;
+ struct exfat_dentry *ep;
+
+ if (num >= es->num_entries)
+ return NULL;
+
+ bh = es->bh[EXFAT_B_TO_BLK(off, es->sb)];
+ if (!bh)
+ return NULL;

- return (struct exfat_dentry *)p;
+ ep = (struct exfat_dentry *)
+ (bh->b_data + EXFAT_BLK_OFFSET(off, es->sb));
+
+ switch (type) {
+ case TYPE_ALL: /* accept any */
+ break;
+ case TYPE_FILE:
+ if (ep->type != EXFAT_FILE)
+ return NULL;
+ break;
+ case TYPE_SECONDARY:
+ if (!(type & exfat_get_entry_type(ep)))
+ return NULL;
+ break;
+ default:
+ if (type != exfat_get_entry_type(ep))
+ return NULL;
+ }
+ return ep;
}

/*
* Returns a set of dentries for a file or dir.
*
- * Note It provides a direct pointer to bh->data via exfat_get_dentry_cached().
+ * Note It provides a direct pointer to bh->data via exfat_get_validated_dentry().
* User should call exfat_get_dentry_set() after setting 'modified' to apply
* changes made in this entry set to the real device.
*
* in:
* sb+p_dir+entry: indicates a file/dir
- * type: specifies how many dentries should be included.
+ * max_entries: specifies how many dentries should be included.
* return:
* pointer of entry set on success,
* NULL on failure.
*/
struct exfat_entry_set_cache *exfat_get_dentry_set(struct super_block *sb,
- struct exfat_chain *p_dir, int entry, unsigned int type)
+ struct exfat_chain *p_dir, int entry, int max_entries)
{
int ret, i, num_bh;
- unsigned int off, byte_offset, clu = 0;
+ unsigned int byte_offset, clu = 0;
sector_t sec;
struct exfat_sb_info *sbi = EXFAT_SB(sb);
struct exfat_entry_set_cache *es;
- struct exfat_dentry *ep;
- int num_entries;
- enum exfat_validate_dentry_mode mode = ES_MODE_STARTED;
struct buffer_head *bh;

if (p_dir->dir == DIR_DELETED) {
@@ -844,13 +811,13 @@ struct exfat_entry_set_cache *exfat_get_dentry_set(struct super_block *sb,
return NULL;
es->sb = sb;
es->modified = false;
+ es->num_entries = 1;

/* byte offset in cluster */
byte_offset = EXFAT_CLU_OFFSET(byte_offset, sbi);

/* byte offset in sector */
- off = EXFAT_BLK_OFFSET(byte_offset, sb);
- es->start_off = off;
+ es->start_off = EXFAT_BLK_OFFSET(byte_offset, sb);

/* sector offset in cluster */
sec = EXFAT_B_TO_BLK(byte_offset, sb);
@@ -861,15 +828,12 @@ struct exfat_entry_set_cache *exfat_get_dentry_set(struct super_block *sb,
goto free_es;
es->bh[es->num_bh++] = bh;

- ep = exfat_get_dentry_cached(es, 0);
- if (!exfat_validate_entry(exfat_get_entry_type(ep), &mode))
+ es->ep_file = exfat_get_validated_dentry(es, ES_INDEX_FILE, TYPE_FILE);
+ if (!es->ep_file)
goto free_es;
+ es->num_entries = min(ES_FILE(es).num_ext + 1, max_entries);

- num_entries = type == ES_ALL_ENTRIES ?
- ep->dentry.file.num_ext + 1 : type;
- es->num_entries = num_entries;
-
- num_bh = EXFAT_B_TO_BLK_ROUND_UP(off + num_entries * DENTRY_SIZE, sb);
+ num_bh = EXFAT_B_TO_BLK_ROUND_UP(es->start_off + es->num_entries * DENTRY_SIZE, sb);
for (i = 1; i < num_bh; i++) {
/* get the next sector */
if (exfat_is_last_sector_in_cluster(sbi, sec)) {
@@ -889,10 +853,17 @@ struct exfat_entry_set_cache *exfat_get_dentry_set(struct super_block *sb,
}

/* validiate cached dentries */
- for (i = 1; i < num_entries; i++) {
- ep = exfat_get_dentry_cached(es, i);
- if (!exfat_validate_entry(exfat_get_entry_type(ep), &mode))
- goto free_es;
+ es->ep_stream = exfat_get_validated_dentry(es, ES_INDEX_STREAM, TYPE_STREAM);
+ if (!es->ep_stream)
+ goto free_es;
+
+ if (max_entries == ES_ALL_ENTRIES) {
+ for (i = 0; i < ES_FILE(es).num_ext; i++)
+ if (!exfat_get_validated_dentry(es, ES_INDEX_STREAM + i, TYPE_SECONDARY))
+ goto free_es;
+ for (i = 0; i * EXFAT_FILE_NAME_LEN < ES_STREAM(es).name_len; i++)
+ if (!exfat_get_validated_dentry(es, ES_INDEX_NAME + i, TYPE_NAME))
+ goto free_es;
}
return es;

@@ -1028,7 +999,7 @@ int exfat_find_dir_entry(struct super_block *sb, struct exfat_inode_info *ei,
}

brelse(bh);
- if (entry_type == TYPE_EXTEND) {
+ if (entry_type == TYPE_NAME) {
unsigned short entry_uniname[16], unichar;

if (step != DIRENT_STEP_NAME) {
@@ -1144,7 +1115,7 @@ int exfat_count_ext_entries(struct super_block *sb, struct exfat_chain *p_dir,

type = exfat_get_entry_type(ext_ep);
brelse(bh);
- if (type == TYPE_EXTEND || type == TYPE_STREAM)
+ if (type == TYPE_NAME || type == TYPE_STREAM)
count++;
else
break;
diff --git a/fs/exfat/exfat_fs.h b/fs/exfat/exfat_fs.h
index 44dc04520175..e46f3e0c16b7 100644
--- a/fs/exfat/exfat_fs.h
+++ b/fs/exfat/exfat_fs.h
@@ -40,7 +40,7 @@ enum {
* Type Definitions
*/
#define ES_2_ENTRIES 2
-#define ES_ALL_ENTRIES 0
+#define ES_ALL_ENTRIES 256

#define DIR_DELETED 0xFFFF0321

@@ -56,7 +56,7 @@ enum {
#define TYPE_FILE 0x011F
#define TYPE_CRITICAL_SEC 0x0200
#define TYPE_STREAM 0x0201
-#define TYPE_EXTEND 0x0202
+#define TYPE_NAME 0x0202
#define TYPE_ACL 0x0203
#define TYPE_BENIGN_PRI 0x0400
#define TYPE_GUID 0x0401
@@ -65,6 +65,9 @@ enum {
#define TYPE_BENIGN_SEC 0x0800
#define TYPE_ALL 0x0FFF

+#define TYPE_PRIMARY (TYPE_CRITICAL_PRI | TYPE_BENIGN_PRI)
+#define TYPE_SECONDARY (TYPE_CRITICAL_SEC | TYPE_BENIGN_SEC)
+
#define MAX_CHARSET_SIZE 6 /* max size of multi-byte character */
#define MAX_NAME_LENGTH 255 /* max len of file name excluding NULL */
#define MAX_VFSNAME_BUF_SIZE ((MAX_NAME_LENGTH + 1) * MAX_CHARSET_SIZE)
@@ -171,9 +174,13 @@ struct exfat_entry_set_cache {
unsigned int start_off;
int num_bh;
struct buffer_head *bh[DIR_CACHE_SIZE];
- unsigned int num_entries;
+ int num_entries;
+ struct exfat_dentry *ep_file, *ep_stream;
};

+#define ES_FILE(es) ((es)->ep_file->dentry.file)
+#define ES_STREAM(es) ((es)->ep_stream->dentry.stream)
+
struct exfat_dir_entry {
struct exfat_chain dir;
int entry;
@@ -458,10 +465,10 @@ int exfat_find_location(struct super_block *sb, struct exfat_chain *p_dir,
struct exfat_dentry *exfat_get_dentry(struct super_block *sb,
struct exfat_chain *p_dir, int entry, struct buffer_head **bh,
sector_t *sector);
-struct exfat_dentry *exfat_get_dentry_cached(struct exfat_entry_set_cache *es,
- int num);
+struct exfat_dentry *exfat_get_validated_dentry(struct exfat_entry_set_cache *es,
+ int num, unsigned int type);
struct exfat_entry_set_cache *exfat_get_dentry_set(struct super_block *sb,
- struct exfat_chain *p_dir, int entry, unsigned int type);
+ struct exfat_chain *p_dir, int entry, int max_entries);
int exfat_free_dentry_set(struct exfat_entry_set_cache *es, int sync);
int exfat_count_dir_entries(struct super_block *sb, struct exfat_chain *p_dir);

diff --git a/fs/exfat/exfat_raw.h b/fs/exfat/exfat_raw.h
index 6aec6288e1f2..7e556379ac4b 100644
--- a/fs/exfat/exfat_raw.h
+++ b/fs/exfat/exfat_raw.h
@@ -77,6 +77,10 @@

#define EXFAT_FILE_NAME_LEN 15

+#define ES_INDEX_FILE 0
+#define ES_INDEX_STREAM 1
+#define ES_INDEX_NAME 2
+
/* EXFAT: Main and Backup Boot Sector (512 bytes) */
struct boot_sector {
__u8 jmp_boot[BOOTSEC_JUMP_BOOT_LEN];
@@ -105,7 +109,7 @@ struct boot_sector {
struct exfat_dentry {
__u8 type;
union {
- struct {
+ struct exfat_de_file {
__u8 num_ext;
__le16 checksum;
__le16 attr;
@@ -123,7 +127,7 @@ struct exfat_dentry {
__u8 access_tz;
__u8 reserved2[7];
} __packed file; /* file directory entry */
- struct {
+ struct exfat_de_stream {
__u8 flags;
__u8 reserved1;
__u8 name_len;
@@ -134,17 +138,17 @@ struct exfat_dentry {
__le32 start_clu;
__le64 size;
} __packed stream; /* stream extension directory entry */
- struct {
+ struct exfat_de_name {
__u8 flags;
__le16 unicode_0_14[EXFAT_FILE_NAME_LEN];
} __packed name; /* file name directory entry */
- struct {
+ struct exfat_de_bitmap {
__u8 flags;
__u8 reserved[18];
__le32 start_clu;
__le64 size;
} __packed bitmap; /* allocation bitmap directory entry */
- struct {
+ struct exfat_de_upcase {
__u8 reserved1[3];
__le32 checksum;
__u8 reserved2[12];
diff --git a/fs/exfat/file.c b/fs/exfat/file.c
index 4831a39632a1..504ffcaffacc 100644
--- a/fs/exfat/file.c
+++ b/fs/exfat/file.c
@@ -152,7 +152,6 @@ int __exfat_truncate(struct inode *inode, loff_t new_size)
/* update the directory entry */
if (!evict) {
struct timespec64 ts;
- struct exfat_dentry *ep, *ep2;
struct exfat_entry_set_cache *es;
int err;

@@ -160,32 +159,30 @@ int __exfat_truncate(struct inode *inode, loff_t new_size)
ES_ALL_ENTRIES);
if (!es)
return -EIO;
- ep = exfat_get_dentry_cached(es, 0);
- ep2 = exfat_get_dentry_cached(es, 1);

ts = current_time(inode);
exfat_set_entry_time(sbi, &ts,
- &ep->dentry.file.modify_tz,
- &ep->dentry.file.modify_time,
- &ep->dentry.file.modify_date,
- &ep->dentry.file.modify_time_cs);
- ep->dentry.file.attr = cpu_to_le16(ei->attr);
+ &ES_FILE(es).modify_tz,
+ &ES_FILE(es).modify_time,
+ &ES_FILE(es).modify_date,
+ &ES_FILE(es).modify_time_cs);
+ ES_FILE(es).attr = cpu_to_le16(ei->attr);

/* File size should be zero if there is no cluster allocated */
if (ei->start_clu == EXFAT_EOF_CLUSTER) {
- ep2->dentry.stream.valid_size = 0;
- ep2->dentry.stream.size = 0;
+ ES_STREAM(es).valid_size = 0;
+ ES_STREAM(es).size = 0;
} else {
- ep2->dentry.stream.valid_size = cpu_to_le64(new_size);
- ep2->dentry.stream.size = ep2->dentry.stream.valid_size;
+ ES_STREAM(es).valid_size = cpu_to_le64(new_size);
+ ES_STREAM(es).size = ES_STREAM(es).valid_size;
}

if (new_size == 0) {
/* Any directory can not be truncated to zero */
WARN_ON(ei->type != TYPE_FILE);

- ep2->dentry.stream.flags = ALLOC_FAT_CHAIN;
- ep2->dentry.stream.start_clu = EXFAT_FREE_CLUSTER;
+ ES_STREAM(es).flags = ALLOC_FAT_CHAIN;
+ ES_STREAM(es).start_clu = EXFAT_FREE_CLUSTER;
}

exfat_update_dir_chksum_with_entry_set(es);
diff --git a/fs/exfat/inode.c b/fs/exfat/inode.c
index 7f90204adef5..466f0bf07f75 100644
--- a/fs/exfat/inode.c
+++ b/fs/exfat/inode.c
@@ -20,7 +20,6 @@
static int __exfat_write_inode(struct inode *inode, int sync)
{
unsigned long long on_disk_size;
- struct exfat_dentry *ep, *ep2;
struct exfat_entry_set_cache *es = NULL;
struct super_block *sb = inode->i_sb;
struct exfat_sb_info *sbi = EXFAT_SB(sb);
@@ -45,26 +44,24 @@ static int __exfat_write_inode(struct inode *inode, int sync)
es = exfat_get_dentry_set(sb, &(ei->dir), ei->entry, ES_ALL_ENTRIES);
if (!es)
return -EIO;
- ep = exfat_get_dentry_cached(es, 0);
- ep2 = exfat_get_dentry_cached(es, 1);

- ep->dentry.file.attr = cpu_to_le16(exfat_make_attr(inode));
+ ES_FILE(es).attr = cpu_to_le16(exfat_make_attr(inode));

/* set FILE_INFO structure using the acquired struct exfat_dentry */
exfat_set_entry_time(sbi, &ei->i_crtime,
- &ep->dentry.file.create_tz,
- &ep->dentry.file.create_time,
- &ep->dentry.file.create_date,
- &ep->dentry.file.create_time_cs);
+ &ES_FILE(es).create_tz,
+ &ES_FILE(es).create_time,
+ &ES_FILE(es).create_date,
+ &ES_FILE(es).create_time_cs);
exfat_set_entry_time(sbi, &inode->i_mtime,
- &ep->dentry.file.modify_tz,
- &ep->dentry.file.modify_time,
- &ep->dentry.file.modify_date,
- &ep->dentry.file.modify_time_cs);
+ &ES_FILE(es).modify_tz,
+ &ES_FILE(es).modify_time,
+ &ES_FILE(es).modify_date,
+ &ES_FILE(es).modify_time_cs);
exfat_set_entry_time(sbi, &inode->i_atime,
- &ep->dentry.file.access_tz,
- &ep->dentry.file.access_time,
- &ep->dentry.file.access_date,
+ &ES_FILE(es).access_tz,
+ &ES_FILE(es).access_time,
+ &ES_FILE(es).access_date,
NULL);

/* File size should be zero if there is no cluster allocated */
@@ -73,8 +70,8 @@ static int __exfat_write_inode(struct inode *inode, int sync)
if (ei->start_clu == EXFAT_EOF_CLUSTER)
on_disk_size = 0;

- ep2->dentry.stream.valid_size = cpu_to_le64(on_disk_size);
- ep2->dentry.stream.size = ep2->dentry.stream.valid_size;
+ ES_STREAM(es).valid_size = cpu_to_le64(on_disk_size);
+ ES_STREAM(es).size = ES_STREAM(es).valid_size;

exfat_update_dir_chksum_with_entry_set(es);
return exfat_free_dentry_set(es, sync);
@@ -219,7 +216,6 @@ static int exfat_map_cluster(struct inode *inode, unsigned int clu_offset,
*clu = new_clu.dir;

if (ei->dir.dir != DIR_DELETED && modified) {
- struct exfat_dentry *ep;
struct exfat_entry_set_cache *es;
int err;

@@ -227,17 +223,12 @@ static int exfat_map_cluster(struct inode *inode, unsigned int clu_offset,
ES_ALL_ENTRIES);
if (!es)
return -EIO;
- /* get stream entry */
- ep = exfat_get_dentry_cached(es, 1);
-
- /* update directory entry */
- ep->dentry.stream.flags = ei->flags;
- ep->dentry.stream.start_clu =
- cpu_to_le32(ei->start_clu);
- ep->dentry.stream.valid_size =
- cpu_to_le64(i_size_read(inode));
- ep->dentry.stream.size =
- ep->dentry.stream.valid_size;
+
+ /* update stream directory entry */
+ ES_STREAM(es).flags = ei->flags;
+ ES_STREAM(es).start_clu = cpu_to_le32(ei->start_clu);
+ ES_STREAM(es).valid_size = cpu_to_le64(i_size_read(inode));
+ ES_STREAM(es).size = ES_STREAM(es).valid_size;

exfat_update_dir_chksum_with_entry_set(es);
err = exfat_free_dentry_set(es, inode_needs_sync(inode));
diff --git a/fs/exfat/namei.c b/fs/exfat/namei.c
index 2aff6605fecc..6a034f504d83 100644
--- a/fs/exfat/namei.c
+++ b/fs/exfat/namei.c
@@ -658,25 +658,21 @@ static int exfat_find(struct inode *dir, struct qstr *qname,

info->num_subdirs = count;
} else {
- struct exfat_dentry *ep, *ep2;
struct exfat_entry_set_cache *es;

es = exfat_get_dentry_set(sb, &cdir, dentry, ES_2_ENTRIES);
if (!es)
return -EIO;
- ep = exfat_get_dentry_cached(es, 0);
- ep2 = exfat_get_dentry_cached(es, 1);

- info->type = exfat_get_entry_type(ep);
- info->attr = le16_to_cpu(ep->dentry.file.attr);
- info->size = le64_to_cpu(ep2->dentry.stream.valid_size);
+ info->attr = le16_to_cpu(ES_FILE(es).attr);
+ info->type = (info->attr & ATTR_SUBDIR) ? TYPE_DIR : TYPE_FILE;
+ info->size = le64_to_cpu(ES_STREAM(es).valid_size);
if ((info->type == TYPE_FILE) && (info->size == 0)) {
info->flags = ALLOC_NO_FAT_CHAIN;
info->start_clu = EXFAT_EOF_CLUSTER;
} else {
- info->flags = ep2->dentry.stream.flags;
- info->start_clu =
- le32_to_cpu(ep2->dentry.stream.start_clu);
+ info->flags = ES_STREAM(es).flags;
+ info->start_clu = le32_to_cpu(ES_STREAM(es).start_clu);
}

if (ei->start_clu == EXFAT_FREE_CLUSTER) {
@@ -688,19 +684,19 @@ static int exfat_find(struct inode *dir, struct qstr *qname,
}

exfat_get_entry_time(sbi, &info->crtime,
- ep->dentry.file.create_tz,
- ep->dentry.file.create_time,
- ep->dentry.file.create_date,
- ep->dentry.file.create_time_cs);
+ ES_FILE(es).create_tz,
+ ES_FILE(es).create_time,
+ ES_FILE(es).create_date,
+ ES_FILE(es).create_time_cs);
exfat_get_entry_time(sbi, &info->mtime,
- ep->dentry.file.modify_tz,
- ep->dentry.file.modify_time,
- ep->dentry.file.modify_date,
- ep->dentry.file.modify_time_cs);
+ ES_FILE(es).modify_tz,
+ ES_FILE(es).modify_time,
+ ES_FILE(es).modify_date,
+ ES_FILE(es).modify_time_cs);
exfat_get_entry_time(sbi, &info->atime,
- ep->dentry.file.access_tz,
- ep->dentry.file.access_time,
- ep->dentry.file.access_date,
+ ES_FILE(es).access_tz,
+ ES_FILE(es).access_time,
+ ES_FILE(es).access_date,
0);
exfat_free_dentry_set(es, false);

--
2.25.1