[PATCH v3 1/2] staging: exfat: remove DOSNAMEs.

[Tetsuhiro Kohada <Kohada.Tetsuhiro@dc.MitsubishiElectric.co.jp>]

remove 'dos_name','short_name' and related definitions.

'dos_name' and 'short_name' are definitions before VFAT.
These are never used in exFAT.

Signed-off-by: Tetsuhiro Kohada <Kohada.Tetsuhiro@dc.MitsubishiElectric.co.jp>
---
Changes in v3:
- Rebase to staging-next.

Changes in v2:
- Rebase to linux-next-next-20200213.

 drivers/staging/exfat/exfat.h       | 52 +++--------------------------
 drivers/staging/exfat/exfat_core.c  | 47 +++++++++-----------------
 drivers/staging/exfat/exfat_super.c | 37 ++++++++------------
 3 files changed, 33 insertions(+), 103 deletions(-)

diff --git a/drivers/staging/exfat/exfat.h b/drivers/staging/exfat/exfat.h
index 05e21839b349..ca9d3b5a3076 100644
--- a/drivers/staging/exfat/exfat.h
+++ b/drivers/staging/exfat/exfat.h
@@ -189,8 +189,6 @@ static inline u16 get_row_index(u16 i)
 #define MAX_PATH_DEPTH		15	/* max depth of path name */
 #define MAX_NAME_LENGTH		256	/* max len of filename including NULL */
 #define MAX_PATH_LENGTH		260	/* max len of pathname including NULL */
-#define DOS_NAME_LENGTH		11	/* DOS filename length excluding NULL */
-#define DOS_PATH_LENGTH		80	/* DOS pathname length excluding NULL */
 
 /* file attributes */
 #define ATTR_NORMAL		0x0000
@@ -210,9 +208,6 @@ static inline u16 get_row_index(u16 i)
 
 #define NUM_UPCASE              2918
 
-#define DOS_CUR_DIR_NAME        ".          "
-#define DOS_PAR_DIR_NAME        "..         "
-
 #ifdef __LITTLE_ENDIAN
 #define UNI_CUR_DIR_NAME        ".\0"
 #define UNI_PAR_DIR_NAME        ".\0.\0"
@@ -261,10 +256,6 @@ struct file_id_t {
 
 struct dir_entry_t {
 	char name[MAX_NAME_LENGTH * MAX_CHARSET_SIZE];
-
-	/* used only for FAT12/16/32, not used for exFAT */
-	char short_name[DOS_NAME_LENGTH + 2];
-
 	u32 attr;
 	u64 Size;
 	u32 num_subdirs;
@@ -381,33 +372,6 @@ struct dentry_t {
 	u8       dummy[32];
 };
 
-struct dos_dentry_t {
-	u8       name[DOS_NAME_LENGTH];
-	u8       attr;
-	u8       lcase;
-	u8       create_time_ms;
-	u8       create_time[2];
-	u8       create_date[2];
-	u8       access_date[2];
-	u8       start_clu_hi[2];
-	u8       modify_time[2];
-	u8       modify_date[2];
-	u8       start_clu_lo[2];
-	u8       size[4];
-};
-
-/* MS-DOS FAT extended directory entry (32 bytes) */
-struct ext_dentry_t {
-	u8       order;
-	u8       unicode_0_4[10];
-	u8       attr;
-	u8       sysid;
-	u8       checksum;
-	u8       unicode_5_10[12];
-	u8       start_clu[2];
-	u8       unicode_11_12[4];
-};
-
 /* MS-DOS EXFAT file directory entry (32 bytes) */
 struct file_dentry_t {
 	u8       type;
@@ -482,12 +446,6 @@ struct uentry_t {
 	struct chain_t     clu;
 };
 
-/* DOS name structure */
-struct dos_name_t {
-	u8       name[DOS_NAME_LENGTH];
-	u8       name_case;
-};
-
 /* unicode name structure */
 struct uni_name_t {
 	u16      name[MAX_NAME_LENGTH];
@@ -725,8 +683,7 @@ struct entry_set_cache_t *get_entry_set_in_dir(struct super_block *sb,
 					       u32 type,
 					       struct dentry_t **file_ep);
 void release_entry_set(struct entry_set_cache_t *es);
-s32 count_dos_name_entries(struct super_block *sb, struct chain_t *p_dir,
-			   u32 type);
+s32 count_entries(struct super_block *sb, struct chain_t *p_dir, u32 type);
 void update_dir_checksum(struct super_block *sb, struct chain_t *p_dir,
 			 s32 entry);
 void update_dir_checksum_with_entry_set(struct super_block *sb,
@@ -734,9 +691,8 @@ void update_dir_checksum_with_entry_set(struct super_block *sb,
 bool is_dir_empty(struct super_block *sb, struct chain_t *p_dir);
 
 /* name conversion functions */
-s32 get_num_entries_and_dos_name(struct super_block *sb, struct chain_t *p_dir,
-				 struct uni_name_t *p_uniname, s32 *entries,
-				 struct dos_name_t *p_dosname);
+s32 get_num_entries(struct super_block *sb, struct chain_t *p_dir,
+		    struct uni_name_t *p_uniname, s32 *entries);
 u16 calc_checksum_2byte(void *data, s32 len, u16 chksum, s32 type);
 
 /* name resolution functions */
@@ -784,7 +740,7 @@ s32 exfat_count_used_clusters(struct super_block *sb);
 /* dir operation functions */
 s32 exfat_find_dir_entry(struct super_block *sb, struct chain_t *p_dir,
 			 struct uni_name_t *p_uniname, s32 num_entries,
-			 struct dos_name_t *p_dosname, u32 type);
+			 u32 type);
 void exfat_delete_dir_entry(struct super_block *sb, struct chain_t *p_dir,
 			    s32 entry, s32 order, s32 num_entries);
 void exfat_get_uni_name_from_ext_entry(struct super_block *sb,
diff --git a/drivers/staging/exfat/exfat_core.c b/drivers/staging/exfat/exfat_core.c
index 5a686289a1db..94a10c5984ac 100644
--- a/drivers/staging/exfat/exfat_core.c
+++ b/drivers/staging/exfat/exfat_core.c
@@ -1044,8 +1044,7 @@ static s32 exfat_init_dir_entry(struct super_block *sb, struct chain_t *p_dir,
 
 static s32 exfat_init_ext_entry(struct super_block *sb, struct chain_t *p_dir,
 				s32 entry, s32 num_entries,
-				struct uni_name_t *p_uniname,
-				struct dos_name_t *p_dosname)
+				struct uni_name_t *p_uniname)
 {
 	int i;
 	sector_t sector;
@@ -1687,7 +1686,7 @@ static s32 extract_uni_name_from_name_entry(struct name_dentry_t *ep, u16 *unina
  */
 s32 exfat_find_dir_entry(struct super_block *sb, struct chain_t *p_dir,
 			 struct uni_name_t *p_uniname, s32 num_entries,
-			 struct dos_name_t *p_dosname, u32 type)
+			 u32 type)
 {
 	int i = 0, dentry = 0, num_ext_entries = 0, len, step;
 	s32 order = 0;
@@ -1851,8 +1850,7 @@ s32 exfat_count_ext_entries(struct super_block *sb, struct chain_t *p_dir,
 	return count;
 }
 
-s32 count_dos_name_entries(struct super_block *sb, struct chain_t *p_dir,
-			   u32 type)
+s32 count_entries(struct super_block *sb, struct chain_t *p_dir, u32 type)
 {
 	int i, count = 0;
 	s32 dentries_per_clu;
@@ -1964,11 +1962,10 @@ bool is_dir_empty(struct super_block *sb, struct chain_t *p_dir)
  */
 
 /* input  : dir, uni_name
- * output : num_of_entry, dos_name(format : aaaaaa~1.bbb)
+ * output : num_of_entry
  */
-s32 get_num_entries_and_dos_name(struct super_block *sb, struct chain_t *p_dir,
-				 struct uni_name_t *p_uniname, s32 *entries,
-				 struct dos_name_t *p_dosname)
+s32 get_num_entries(struct super_block *sb, struct chain_t *p_dir,
+		    struct uni_name_t *p_uniname, s32 *entries)
 {
 	s32 num_entries;
 
@@ -2136,12 +2133,10 @@ s32 create_dir(struct inode *inode, struct chain_t *p_dir,
 	s32 ret, dentry, num_entries;
 	u64 size;
 	struct chain_t clu;
-	struct dos_name_t dos_name;
 	struct super_block *sb = inode->i_sb;
 	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
 
-	ret = get_num_entries_and_dos_name(sb, p_dir, p_uniname, &num_entries,
-					   &dos_name);
+	ret = get_num_entries(sb, p_dir, p_uniname, &num_entries);
 	if (ret)
 		return ret;
 
@@ -2174,8 +2169,7 @@ s32 create_dir(struct inode *inode, struct chain_t *p_dir,
 	if (ret != 0)
 		return ret;
 
-	ret = exfat_init_ext_entry(sb, p_dir, dentry, num_entries, p_uniname,
-				   &dos_name);
+	ret = exfat_init_ext_entry(sb, p_dir, dentry, num_entries, p_uniname);
 	if (ret != 0)
 		return ret;
 
@@ -2200,11 +2194,9 @@ s32 create_file(struct inode *inode, struct chain_t *p_dir,
 		struct uni_name_t *p_uniname, u8 mode, struct file_id_t *fid)
 {
 	s32 ret, dentry, num_entries;
-	struct dos_name_t dos_name;
 	struct super_block *sb = inode->i_sb;
 
-	ret = get_num_entries_and_dos_name(sb, p_dir, p_uniname, &num_entries,
-					   &dos_name);
+	ret = get_num_entries(sb, p_dir, p_uniname, &num_entries);
 	if (ret)
 		return ret;
 
@@ -2214,7 +2206,7 @@ s32 create_file(struct inode *inode, struct chain_t *p_dir,
 		return -ENOSPC;
 
 	/* (1) update the directory entry */
-	/* fill the dos name directory entry information of the created file.
+	/* fill the directory entry information of the created file.
 	 * the first cluster is not determined yet. (0)
 	 */
 	ret = exfat_init_dir_entry(sb, p_dir, dentry, TYPE_FILE | mode,
@@ -2222,8 +2214,7 @@ s32 create_file(struct inode *inode, struct chain_t *p_dir,
 	if (ret != 0)
 		return ret;
 
-	ret = exfat_init_ext_entry(sb, p_dir, dentry, num_entries, p_uniname,
-				   &dos_name);
+	ret = exfat_init_ext_entry(sb, p_dir, dentry, num_entries, p_uniname);
 	if (ret != 0)
 		return ret;
 
@@ -2276,7 +2267,6 @@ s32 exfat_rename_file(struct inode *inode, struct chain_t *p_dir, s32 oldentry,
 {
 	s32 ret, newentry = -1, num_old_entries, num_new_entries;
 	sector_t sector_old, sector_new;
-	struct dos_name_t dos_name;
 	struct dentry_t *epold, *epnew;
 	struct super_block *sb = inode->i_sb;
 
@@ -2295,8 +2285,7 @@ s32 exfat_rename_file(struct inode *inode, struct chain_t *p_dir, s32 oldentry,
 	}
 	num_old_entries++;
 
-	ret = get_num_entries_and_dos_name(sb, p_dir, p_uniname,
-					   &num_new_entries, &dos_name);
+	ret = get_num_entries(sb, p_dir, p_uniname, &num_new_entries);
 	if (ret) {
 		exfat_buf_unlock(sb, sector_old);
 		return ret;
@@ -2341,8 +2330,7 @@ s32 exfat_rename_file(struct inode *inode, struct chain_t *p_dir, s32 oldentry,
 		exfat_buf_unlock(sb, sector_old);
 
 		ret = exfat_init_ext_entry(sb, p_dir, newentry,
-					   num_new_entries, p_uniname,
-					   &dos_name);
+					   num_new_entries, p_uniname);
 		if (ret != 0)
 			return ret;
 
@@ -2360,8 +2348,7 @@ s32 exfat_rename_file(struct inode *inode, struct chain_t *p_dir, s32 oldentry,
 		exfat_buf_unlock(sb, sector_old);
 
 		ret = exfat_init_ext_entry(sb, p_dir, oldentry,
-					   num_new_entries, p_uniname,
-					   &dos_name);
+					   num_new_entries, p_uniname);
 		if (ret != 0)
 			return ret;
 
@@ -2378,7 +2365,6 @@ s32 move_file(struct inode *inode, struct chain_t *p_olddir, s32 oldentry,
 {
 	s32 ret, newentry, num_new_entries, num_old_entries;
 	sector_t sector_mov, sector_new;
-	struct dos_name_t dos_name;
 	struct dentry_t *epmov, *epnew;
 	struct super_block *sb = inode->i_sb;
 
@@ -2402,8 +2388,7 @@ s32 move_file(struct inode *inode, struct chain_t *p_olddir, s32 oldentry,
 	}
 	num_old_entries++;
 
-	ret = get_num_entries_and_dos_name(sb, p_newdir, p_uniname,
-					   &num_new_entries, &dos_name);
+	ret = get_num_entries(sb, p_newdir, p_uniname, &num_new_entries);
 	if (ret) {
 		exfat_buf_unlock(sb, sector_mov);
 		return ret;
@@ -2445,7 +2430,7 @@ s32 move_file(struct inode *inode, struct chain_t *p_olddir, s32 oldentry,
 	exfat_buf_unlock(sb, sector_mov);
 
 	ret = exfat_init_ext_entry(sb, p_newdir, newentry, num_new_entries,
-				   p_uniname, &dos_name);
+				   p_uniname);
 	if (ret != 0)
 		return ret;
 
diff --git a/drivers/staging/exfat/exfat_super.c b/drivers/staging/exfat/exfat_super.c
index 8446444cf68a..f31f771a3dc0 100644
--- a/drivers/staging/exfat/exfat_super.c
+++ b/drivers/staging/exfat/exfat_super.c
@@ -539,7 +539,6 @@ static int ffsLookupFile(struct inode *inode, char *path, struct file_id_t *fid)
 	int ret, dentry, num_entries;
 	struct chain_t dir;
 	struct uni_name_t uni_name;
-	struct dos_name_t dos_name;
 	struct dentry_t *ep, *ep2;
 	struct entry_set_cache_t *es = NULL;
 	struct super_block *sb = inode->i_sb;
@@ -559,14 +558,13 @@ static int ffsLookupFile(struct inode *inode, char *path, struct file_id_t *fid)
 	if (ret)
 		goto out;
 
-	ret = get_num_entries_and_dos_name(sb, &dir, &uni_name, &num_entries,
-					   &dos_name);
+	ret = get_num_entries(sb, &dir, &uni_name, &num_entries);
 	if (ret)
 		goto out;
 
 	/* search the file name for directories */
 	dentry = exfat_find_dir_entry(sb, &dir, &uni_name, num_entries,
-				      &dos_name, TYPE_ALL);
+				      TYPE_ALL);
 	if (dentry < -1) {
 		ret = -ENOENT;
 		goto out;
@@ -1456,7 +1454,6 @@ static int ffsReadStat(struct inode *inode, struct dir_entry_t *info)
 			       sizeof(struct date_time_t));
 			memset((char *)&info->access_timestamp, 0,
 			       sizeof(struct date_time_t));
-			strcpy(info->short_name, ".");
 			strcpy(info->name, ".");
 
 			dir.dir = p_fs->root_dir;
@@ -1471,7 +1468,7 @@ static int ffsReadStat(struct inode *inode, struct dir_entry_t *info)
 						p_fs->cluster_size_bits;
 			}
 
-			count = count_dos_name_entries(sb, &dir, TYPE_DIR);
+			count = count_entries(sb, &dir, TYPE_DIR);
 			if (count < 0) {
 				ret = count; /* propagate error upward */
 				goto out;
@@ -1538,7 +1535,7 @@ static int ffsReadStat(struct inode *inode, struct dir_entry_t *info)
 			info->Size = (u64)count_num_clusters(sb, &dir) <<
 					p_fs->cluster_size_bits;
 
-		count = count_dos_name_entries(sb, &dir, TYPE_DIR);
+		count = count_entries(sb, &dir, TYPE_DIR);
 		if (count < 0) {
 			ret = count; /* propagate error upward */
 			goto out;
@@ -2061,8 +2058,9 @@ static int exfat_readdir(struct file *filp, struct dir_context *ctx)
 	struct super_block *sb = inode->i_sb;
 	struct bd_info_t *p_bd = &(EXFAT_SB(sb)->bd_info);
 	struct dir_entry_t de;
+	struct inode *tmp;
 	unsigned long inum;
-	loff_t cpos;
+	loff_t cpos, i_pos;
 	int err = 0;
 
 	__lock_super(sb);
@@ -2111,21 +2109,14 @@ static int exfat_readdir(struct file *filp, struct dir_context *ctx)
 	if (!de.name[0])
 		goto end_of_dir;
 
-	if (!memcmp(de.short_name, DOS_CUR_DIR_NAME, DOS_NAME_LENGTH)) {
-		inum = inode->i_ino;
-	} else if (!memcmp(de.short_name, DOS_PAR_DIR_NAME, DOS_NAME_LENGTH)) {
-		inum = parent_ino(filp->f_path.dentry);
+	i_pos = ((loff_t)EXFAT_I(inode)->fid.start_clu << 32) |
+		((EXFAT_I(inode)->fid.rwoffset - 1) & 0xffffffff);
+	tmp = exfat_iget(sb, i_pos);
+	if (tmp) {
+		inum = tmp->i_ino;
+		iput(tmp);
 	} else {
-		loff_t i_pos = ((loff_t)EXFAT_I(inode)->fid.start_clu << 32) |
-				((EXFAT_I(inode)->fid.rwoffset - 1) & 0xffffffff);
-		struct inode *tmp = exfat_iget(sb, i_pos);
-
-		if (tmp) {
-			inum = tmp->i_ino;
-			iput(tmp);
-		} else {
-			inum = iunique(sb, EXFAT_ROOT_INO);
-		}
+		inum = iunique(sb, EXFAT_ROOT_INO);
 	}
 
 	if (!dir_emit(ctx, de.name, strlen(de.name), inum,
@@ -3829,8 +3820,6 @@ static int __init init_exfat(void)
 	int err;
 
 	BUILD_BUG_ON(sizeof(struct dentry_t) != DENTRY_SIZE);
-	BUILD_BUG_ON(sizeof(struct dos_dentry_t) != DENTRY_SIZE);
-	BUILD_BUG_ON(sizeof(struct ext_dentry_t) != DENTRY_SIZE);
 	BUILD_BUG_ON(sizeof(struct file_dentry_t) != DENTRY_SIZE);
 	BUILD_BUG_ON(sizeof(struct strm_dentry_t) != DENTRY_SIZE);
 	BUILD_BUG_ON(sizeof(struct name_dentry_t) != DENTRY_SIZE);
-- 
2.25.0