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* [PATCH] staging: exfat: add exfat filesystem code to staging
@ 2019-08-28 16:08 Greg Kroah-Hartman
  2019-08-28 17:00 ` Greg Kroah-Hartman
                   ` (6 more replies)
  0 siblings, 7 replies; 70+ messages in thread
From: Greg Kroah-Hartman @ 2019-08-28 16:08 UTC (permalink / raw)
  To: devel
  Cc: linux-fsdevel, linux-kernel, Valdis Klētnieks, Sasha Levin,
	Greg Kroah-Hartman

From: Valdis Klētnieks <valdis.kletnieks@vt.edu>

The exfat code needs a lot of work to get it into "real" shape for
the fs/ part of the kernel, so put it into drivers/staging/ for now so
that it can be worked on by everyone in the community.

The full specification of the filesystem can be found at:
  https://docs.microsoft.com/en-us/windows/win32/fileio/exfat-specification

Signed-off-by: Valdis Kletnieks <valdis.kletnieks@vt.edu>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 MAINTAINERS                          |    5 +
 drivers/staging/Kconfig              |    2 +
 drivers/staging/Makefile             |    1 +
 drivers/staging/exfat/Kconfig        |   39 +
 drivers/staging/exfat/Makefile       |   10 +
 drivers/staging/exfat/TODO           |   12 +
 drivers/staging/exfat/exfat.h        |  973 ++++++
 drivers/staging/exfat/exfat_blkdev.c |  136 +
 drivers/staging/exfat/exfat_cache.c  |  722 +++++
 drivers/staging/exfat/exfat_core.c   | 3704 +++++++++++++++++++++++
 drivers/staging/exfat/exfat_nls.c    |  404 +++
 drivers/staging/exfat/exfat_super.c  | 4137 ++++++++++++++++++++++++++
 drivers/staging/exfat/exfat_upcase.c |  740 +++++
 13 files changed, 10885 insertions(+)
 create mode 100644 drivers/staging/exfat/Kconfig
 create mode 100644 drivers/staging/exfat/Makefile
 create mode 100644 drivers/staging/exfat/TODO
 create mode 100644 drivers/staging/exfat/exfat.h
 create mode 100644 drivers/staging/exfat/exfat_blkdev.c
 create mode 100644 drivers/staging/exfat/exfat_cache.c
 create mode 100644 drivers/staging/exfat/exfat_core.c
 create mode 100644 drivers/staging/exfat/exfat_nls.c
 create mode 100644 drivers/staging/exfat/exfat_super.c
 create mode 100644 drivers/staging/exfat/exfat_upcase.c

diff --git a/MAINTAINERS b/MAINTAINERS
index e3242687cd19..a484b36e5117 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -6097,6 +6097,11 @@ F:	include/trace/events/mdio.h
 F:	include/uapi/linux/mdio.h
 F:	include/uapi/linux/mii.h
 
+EXFAT FILE SYSTEM
+M:	Valdis Kletnieks <valdis.kletnieks@vt.edu>
+S:	Maintained
+F:	fs/exfat/
+
 EXT2 FILE SYSTEM
 M:	Jan Kara <jack@suse.com>
 L:	linux-ext4@vger.kernel.org
diff --git a/drivers/staging/Kconfig b/drivers/staging/Kconfig
index d972ec8e71fb..fbdc33874780 100644
--- a/drivers/staging/Kconfig
+++ b/drivers/staging/Kconfig
@@ -118,4 +118,6 @@ source "drivers/staging/kpc2000/Kconfig"
 
 source "drivers/staging/isdn/Kconfig"
 
+source "drivers/staging/exfat/Kconfig"
+
 endif # STAGING
diff --git a/drivers/staging/Makefile b/drivers/staging/Makefile
index 6018b9a4a077..ca13f87b1e1b 100644
--- a/drivers/staging/Makefile
+++ b/drivers/staging/Makefile
@@ -49,3 +49,4 @@ obj-$(CONFIG_XIL_AXIS_FIFO)	+= axis-fifo/
 obj-$(CONFIG_FIELDBUS_DEV)     += fieldbus/
 obj-$(CONFIG_KPC2000)		+= kpc2000/
 obj-$(CONFIG_ISDN_CAPI)		+= isdn/
+obj-$(CONFIG_EXFAT_FS)		+= exfat/
diff --git a/drivers/staging/exfat/Kconfig b/drivers/staging/exfat/Kconfig
new file mode 100644
index 000000000000..78b32aa2ca19
--- /dev/null
+++ b/drivers/staging/exfat/Kconfig
@@ -0,0 +1,39 @@
+config EXFAT_FS
+	tristate "exFAT fs support"
+	select NLS
+	help
+	  This adds support for the exFAT file system.
+
+config EXFAT_DISCARD
+	bool "enable discard support"
+	depends on EXFAT_FS
+	default y
+
+config EXFAT_DELAYED_SYNC
+	bool "enable delayed sync"
+	depends on EXFAT_FS
+	default n
+
+config EXFAT_KERNEL_DEBUG
+	bool "enable kernel debug features via ioctl"
+	depends on EXFAT_FS
+	default n
+
+config EXFAT_DEBUG_MSG
+	bool "print debug messages"
+	depends on EXFAT_FS
+	default n
+
+config EXFAT_DEFAULT_CODEPAGE
+	int "Default codepage for exFAT"
+	default 437
+	depends on EXFAT_FS
+	help
+	  This option should be set to the codepage of your exFAT filesystems.
+
+config EXFAT_DEFAULT_IOCHARSET
+	string "Default iocharset for exFAT"
+	default "utf8"
+	depends on EXFAT_FS
+	help
+	  Set this to the default input/output character set you'd like exFAT to use.
diff --git a/drivers/staging/exfat/Makefile b/drivers/staging/exfat/Makefile
new file mode 100644
index 000000000000..84944dfbae28
--- /dev/null
+++ b/drivers/staging/exfat/Makefile
@@ -0,0 +1,10 @@
+# SPDX-License-Identifier: GPL-2.0
+
+obj-$(CONFIG_EXFAT_FS) += exfat.o
+
+exfat-y :=	exfat_core.o	\
+		exfat_super.o	\
+		exfat_blkdev.o	\
+		exfat_cache.o	\
+		exfat_nls.o	\
+		exfat_upcase.o
diff --git a/drivers/staging/exfat/TODO b/drivers/staging/exfat/TODO
new file mode 100644
index 000000000000..a3eb282f9efc
--- /dev/null
+++ b/drivers/staging/exfat/TODO
@@ -0,0 +1,12 @@
+exfat_core.c - ffsReadFile - the goto err_out seem to leak a brelse().
+same for ffsWriteFile.
+
+exfat_core.c - fs_sync(sb,0) all over the place looks fishy as hell.
+There's only one place that calls it with a non-zero argument.
+
+ffsTruncateFile -  if (old_size <= new_size) {
+That doesn't look right. How did it ever work? Are they relying on lazy
+block allocation when actual writes happen? If nothing else, it never
+does the 'fid->size = new_size' and do the inode update....
+
+ffsSetAttr() is just dangling in the breeze, not wired up at all...
diff --git a/drivers/staging/exfat/exfat.h b/drivers/staging/exfat/exfat.h
new file mode 100644
index 000000000000..bae180e10609
--- /dev/null
+++ b/drivers/staging/exfat/exfat.h
@@ -0,0 +1,973 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ *  Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
+ */
+
+#ifndef _EXFAT_H
+#define _EXFAT_H
+
+#include <linux/types.h>
+#include <linux/buffer_head.h>
+
+#ifdef CONFIG_EXFAT_KERNEL_DEBUG
+  /* For Debugging Purpose */
+	/* IOCTL code 'f' used by
+	 *   - file systems typically #0~0x1F
+	 *   - embedded terminal devices #128~
+	 *   - exts for debugging purpose #99
+	 * number 100 and 101 is available now but has possible conflicts
+	 */
+#define EXFAT_IOC_GET_DEBUGFLAGS	_IOR('f', 100, long)
+#define EXFAT_IOC_SET_DEBUGFLAGS	_IOW('f', 101, long)
+
+#define EXFAT_DEBUGFLAGS_INVALID_UMOUNT	0x01
+#define EXFAT_DEBUGFLAGS_ERROR_RW	0x02
+#endif /* CONFIG_EXFAT_KERNEL_DEBUG */
+
+#ifdef CONFIG_EXFAT_DEBUG_MSG
+#define DEBUG	1
+#else
+#undef DEBUG
+#endif
+
+#define DENTRY_SIZE		32	/* dir entry size */
+#define DENTRY_SIZE_BITS	5
+
+/* PBR entries */
+#define PBR_SIGNATURE	0xAA55
+#define EXT_SIGNATURE	0xAA550000
+#define VOL_LABEL	"NO NAME    "	/* size should be 11 */
+#define OEM_NAME	"MSWIN4.1"	/* size should be 8 */
+#define STR_FAT12	"FAT12   "	/* size should be 8 */
+#define STR_FAT16	"FAT16   "	/* size should be 8 */
+#define STR_FAT32	"FAT32   "	/* size should be 8 */
+#define STR_EXFAT	"EXFAT   "	/* size should be 8 */
+#define VOL_CLEAN	0x0000
+#define VOL_DIRTY	0x0002
+
+/* max number of clusters */
+#define FAT12_THRESHOLD		4087		/* 2^12 - 1 + 2 (clu 0 & 1) */
+#define FAT16_THRESHOLD		65527		/* 2^16 - 1 + 2 */
+#define FAT32_THRESHOLD		268435457	/* 2^28 - 1 + 2 */
+#define EXFAT_THRESHOLD		268435457	/* 2^28 - 1 + 2 */
+
+/* file types */
+#define TYPE_UNUSED		0x0000
+#define TYPE_DELETED		0x0001
+#define TYPE_INVALID		0x0002
+#define TYPE_CRITICAL_PRI	0x0100
+#define TYPE_BITMAP		0x0101
+#define TYPE_UPCASE		0x0102
+#define TYPE_VOLUME		0x0103
+#define TYPE_DIR		0x0104
+#define TYPE_FILE		0x011F
+#define TYPE_SYMLINK		0x015F
+#define TYPE_CRITICAL_SEC	0x0200
+#define TYPE_STREAM		0x0201
+#define TYPE_EXTEND		0x0202
+#define TYPE_ACL		0x0203
+#define TYPE_BENIGN_PRI		0x0400
+#define TYPE_GUID		0x0401
+#define TYPE_PADDING		0x0402
+#define TYPE_ACLTAB		0x0403
+#define TYPE_BENIGN_SEC		0x0800
+#define TYPE_ALL		0x0FFF
+
+/* time modes */
+#define TM_CREATE		0
+#define TM_MODIFY		1
+#define TM_ACCESS		2
+
+/* checksum types */
+#define CS_DIR_ENTRY		0
+#define CS_PBR_SECTOR		1
+#define CS_DEFAULT		2
+
+#define CLUSTER_16(x)		((u16)(x))
+#define CLUSTER_32(x)		((u32)(x))
+
+#define FALSE			0
+#define TRUE			1
+
+#define START_SECTOR(x)							\
+	((((sector_t)((x) - 2)) << p_fs->sectors_per_clu_bits) +	\
+	 p_fs->data_start_sector)
+
+#define IS_LAST_SECTOR_IN_CLUSTER(sec)				\
+	((((sec) - p_fs->data_start_sector + 1) &		\
+	  ((1 <<  p_fs->sectors_per_clu_bits) - 1)) == 0)
+
+#define GET_CLUSTER_FROM_SECTOR(sec)				\
+	((u32)((((sec) - p_fs->data_start_sector) >>		\
+		p_fs->sectors_per_clu_bits) + 2))
+
+#define GET16(p_src)						\
+	(((u16)(p_src)[0]) | (((u16)(p_src)[1]) << 8))
+#define GET32(p_src)						\
+	(((u32)(p_src)[0]) | (((u32)(p_src)[1]) << 8) |		\
+	(((u32)(p_src)[2]) << 16) | (((u32)(p_src)[3]) << 24))
+#define GET64(p_src) \
+	(((u64)(p_src)[0]) | (((u64)(p_src)[1]) << 8) |		\
+	(((u64)(p_src)[2]) << 16) | (((u64)(p_src)[3]) << 24) |	\
+	(((u64)(p_src)[4]) << 32) | (((u64)(p_src)[5]) << 40) |	\
+	(((u64)(p_src)[6]) << 48) | (((u64)(p_src)[7]) << 56))
+
+#define SET16(p_dst, src)					\
+	do {							\
+		(p_dst)[0] = (u8)(src);				\
+		(p_dst)[1] = (u8)(((u16)(src)) >> 8);		\
+	} while (0)
+#define SET32(p_dst, src)					\
+	do {							\
+		(p_dst)[0] = (u8)(src);				\
+		(p_dst)[1] = (u8)(((u32)(src)) >> 8);		\
+		(p_dst)[2] = (u8)(((u32)(src)) >> 16);		\
+		(p_dst)[3] = (u8)(((u32)(src)) >> 24);		\
+	} while (0)
+#define SET64(p_dst, src)					\
+	do {							\
+		(p_dst)[0] = (u8)(src);				\
+		(p_dst)[1] = (u8)(((u64)(src)) >> 8);		\
+		(p_dst)[2] = (u8)(((u64)(src)) >> 16);		\
+		(p_dst)[3] = (u8)(((u64)(src)) >> 24);		\
+		(p_dst)[4] = (u8)(((u64)(src)) >> 32);		\
+		(p_dst)[5] = (u8)(((u64)(src)) >> 40);		\
+		(p_dst)[6] = (u8)(((u64)(src)) >> 48);		\
+		(p_dst)[7] = (u8)(((u64)(src)) >> 56);		\
+	} while (0)
+
+#ifdef __LITTLE_ENDIAN
+#define GET16_A(p_src)		(*((u16 *)(p_src)))
+#define GET32_A(p_src)		(*((u32 *)(p_src)))
+#define GET64_A(p_src)		(*((u64 *)(p_src)))
+#define SET16_A(p_dst, src)	(*((u16 *)(p_dst)) = (u16)(src))
+#define SET32_A(p_dst, src)	(*((u32 *)(p_dst)) = (u32)(src))
+#define SET64_A(p_dst, src)	(*((u64 *)(p_dst)) = (u64)(src))
+#else /* BIG_ENDIAN */
+#define GET16_A(p_src)		GET16(p_src)
+#define GET32_A(p_src)		GET32(p_src)
+#define GET64_A(p_src)		GET64(p_src)
+#define SET16_A(p_dst, src)	SET16(p_dst, src)
+#define SET32_A(p_dst, src)	SET32(p_dst, src)
+#define SET64_A(p_dst, src)	SET64(p_dst, src)
+#endif
+
+/* cache size (in number of sectors) */
+/* (should be an exponential value of 2) */
+#define FAT_CACHE_SIZE		128
+#define FAT_CACHE_HASH_SIZE	64
+#define BUF_CACHE_SIZE		256
+#define BUF_CACHE_HASH_SIZE	64
+
+/* Upcase table macro */
+#define HIGH_INDEX_BIT	(8)
+#define HIGH_INDEX_MASK	(0xFF00)
+#define LOW_INDEX_BIT	(16-HIGH_INDEX_BIT)
+#define UTBL_ROW_COUNT	(1<<LOW_INDEX_BIT)
+#define UTBL_COL_COUNT	(1<<HIGH_INDEX_BIT)
+
+static inline u16 get_col_index(u16 i)
+{
+	return i >> LOW_INDEX_BIT;
+}
+static inline u16 get_row_index(u16 i)
+{
+	return i & ~HIGH_INDEX_MASK;
+}
+
+#define EXFAT_SUPER_MAGIC       (0x2011BAB0L)
+#define EXFAT_ROOT_INO          1
+
+/* FAT types */
+#define FAT12			0x01	/* FAT12 */
+#define FAT16			0x0E	/* Win95 FAT16 (LBA) */
+#define FAT32			0x0C	/* Win95 FAT32 (LBA) */
+#define EXFAT			0x07	/* exFAT */
+
+/* file name lengths */
+#define MAX_CHARSET_SIZE	3	/* max size of multi-byte character */
+#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
+#define ATTR_READONLY		0x0001
+#define ATTR_HIDDEN		0x0002
+#define ATTR_SYSTEM		0x0004
+#define ATTR_VOLUME		0x0008
+#define ATTR_SUBDIR		0x0010
+#define ATTR_ARCHIVE		0x0020
+#define ATTR_SYMLINK		0x0040
+#define ATTR_EXTEND		0x000F
+#define ATTR_RWMASK		0x007E
+
+/* file creation modes */
+#define FM_REGULAR              0x00
+#define FM_SYMLINK              0x40
+
+/* return values */
+#define FFS_SUCCESS             0
+#define FFS_MEDIAERR            1
+#define FFS_FORMATERR           2
+#define FFS_MOUNTED             3
+#define FFS_NOTMOUNTED          4
+#define FFS_ALIGNMENTERR        5
+#define FFS_SEMAPHOREERR        6
+#define FFS_INVALIDPATH         7
+#define FFS_INVALIDFID          8
+#define FFS_NOTFOUND            9
+#define FFS_FILEEXIST           10
+#define FFS_PERMISSIONERR       11
+#define FFS_NOTOPENED           12
+#define FFS_MAXOPENED           13
+#define FFS_FULL                14
+#define FFS_EOF                 15
+#define FFS_DIRBUSY             16
+#define FFS_MEMORYERR           17
+#define FFS_NAMETOOLONG		18
+#define FFS_ERROR               19
+
+#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"
+#else
+#define UNI_CUR_DIR_NAME        "\0."
+#define UNI_PAR_DIR_NAME        "\0.\0."
+#endif
+
+struct date_time_t {
+	u16      Year;
+	u16      Month;
+	u16      Day;
+	u16      Hour;
+	u16      Minute;
+	u16      Second;
+	u16      MilliSecond;
+};
+
+struct part_info_t {
+	u32      Offset;    /* start sector number of the partition */
+	u32      Size;      /* in sectors */
+};
+
+struct dev_info_t {
+	u32      SecSize;    /* sector size in bytes */
+	u32      DevSize;    /* block device size in sectors */
+};
+
+struct vol_info_t {
+	u32      FatType;
+	u32      ClusterSize;
+	u32      NumClusters;
+	u32      FreeClusters;
+	u32      UsedClusters;
+};
+
+/* directory structure */
+struct chain_t {
+	u32      dir;
+	s32       size;
+	u8       flags;
+};
+
+struct file_id_t {
+	struct chain_t     dir;
+	s32       entry;
+	u32      type;
+	u32      attr;
+	u32      start_clu;
+	u64      size;
+	u8       flags;
+	s64       rwoffset;
+	s32       hint_last_off;
+	u32      hint_last_clu;
+};
+
+struct dir_entry_t {
+	char Name[MAX_NAME_LENGTH * MAX_CHARSET_SIZE];
+
+	/* used only for FAT12/16/32, not used for exFAT */
+	char ShortName[DOS_NAME_LENGTH + 2];
+
+	u32 Attr;
+	u64 Size;
+	u32 NumSubdirs;
+	struct date_time_t CreateTimestamp;
+	struct date_time_t ModifyTimestamp;
+	struct date_time_t AccessTimestamp;
+};
+
+struct timestamp_t {
+	u16      sec;        /* 0 ~ 59               */
+	u16      min;        /* 0 ~ 59               */
+	u16      hour;       /* 0 ~ 23               */
+	u16      day;        /* 1 ~ 31               */
+	u16      mon;        /* 1 ~ 12               */
+	u16      year;       /* 0 ~ 127 (since 1980) */
+};
+
+/* MS_DOS FAT partition boot record (512 bytes) */
+struct pbr_sector_t {
+	u8       jmp_boot[3];
+	u8       oem_name[8];
+	u8       bpb[109];
+	u8       boot_code[390];
+	u8       signature[2];
+};
+
+/* MS-DOS FAT12/16 BIOS parameter block (51 bytes) */
+struct bpb16_t {
+	u8       sector_size[2];
+	u8       sectors_per_clu;
+	u8       num_reserved[2];
+	u8       num_fats;
+	u8       num_root_entries[2];
+	u8       num_sectors[2];
+	u8       media_type;
+	u8       num_fat_sectors[2];
+	u8       sectors_in_track[2];
+	u8       num_heads[2];
+	u8       num_hid_sectors[4];
+	u8       num_huge_sectors[4];
+
+	u8       phy_drv_no;
+	u8       reserved;
+	u8       ext_signature;
+	u8       vol_serial[4];
+	u8       vol_label[11];
+	u8       vol_type[8];
+};
+
+/* MS-DOS FAT32 BIOS parameter block (79 bytes) */
+struct bpb32_t {
+	u8       sector_size[2];
+	u8       sectors_per_clu;
+	u8       num_reserved[2];
+	u8       num_fats;
+	u8       num_root_entries[2];
+	u8       num_sectors[2];
+	u8       media_type;
+	u8       num_fat_sectors[2];
+	u8       sectors_in_track[2];
+	u8       num_heads[2];
+	u8       num_hid_sectors[4];
+	u8       num_huge_sectors[4];
+	u8       num_fat32_sectors[4];
+	u8       ext_flags[2];
+	u8       fs_version[2];
+	u8       root_cluster[4];
+	u8       fsinfo_sector[2];
+	u8       backup_sector[2];
+	u8       reserved[12];
+
+	u8       phy_drv_no;
+	u8       ext_reserved;
+	u8       ext_signature;
+	u8       vol_serial[4];
+	u8       vol_label[11];
+	u8       vol_type[8];
+};
+
+/* MS-DOS EXFAT BIOS parameter block (109 bytes) */
+struct bpbex_t {
+	u8       reserved1[53];
+	u8       vol_offset[8];
+	u8       vol_length[8];
+	u8       fat_offset[4];
+	u8       fat_length[4];
+	u8       clu_offset[4];
+	u8       clu_count[4];
+	u8       root_cluster[4];
+	u8       vol_serial[4];
+	u8       fs_version[2];
+	u8       vol_flags[2];
+	u8       sector_size_bits;
+	u8       sectors_per_clu_bits;
+	u8       num_fats;
+	u8       phy_drv_no;
+	u8       perc_in_use;
+	u8       reserved2[7];
+};
+
+/* MS-DOS FAT file system information sector (512 bytes) */
+struct fsi_sector_t {
+	u8       signature1[4];
+	u8       reserved1[480];
+	u8       signature2[4];
+	u8       free_cluster[4];
+	u8       next_cluster[4];
+	u8       reserved2[14];
+	u8       signature3[2];
+};
+
+/* MS-DOS FAT directory entry (32 bytes) */
+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;
+	u8       num_ext;
+	u8       checksum[2];
+	u8       attr[2];
+	u8       reserved1[2];
+	u8       create_time[2];
+	u8       create_date[2];
+	u8       modify_time[2];
+	u8       modify_date[2];
+	u8       access_time[2];
+	u8       access_date[2];
+	u8       create_time_ms;
+	u8       modify_time_ms;
+	u8       access_time_ms;
+	u8       reserved2[9];
+};
+
+/* MS-DOS EXFAT stream extension directory entry (32 bytes) */
+struct strm_dentry_t {
+	u8       type;
+	u8       flags;
+	u8       reserved1;
+	u8       name_len;
+	u8       name_hash[2];
+	u8       reserved2[2];
+	u8       valid_size[8];
+	u8       reserved3[4];
+	u8       start_clu[4];
+	u8       size[8];
+};
+
+/* MS-DOS EXFAT file name directory entry (32 bytes) */
+struct name_dentry_t {
+	u8       type;
+	u8       flags;
+	u8       unicode_0_14[30];
+};
+
+/* MS-DOS EXFAT allocation bitmap directory entry (32 bytes) */
+struct bmap_dentry_t {
+	u8       type;
+	u8       flags;
+	u8       reserved[18];
+	u8       start_clu[4];
+	u8       size[8];
+};
+
+/* MS-DOS EXFAT up-case table directory entry (32 bytes) */
+struct case_dentry_t {
+	u8       type;
+	u8       reserved1[3];
+	u8       checksum[4];
+	u8       reserved2[12];
+	u8       start_clu[4];
+	u8       size[8];
+};
+
+/* MS-DOS EXFAT volume label directory entry (32 bytes) */
+struct volm_dentry_t {
+	u8       type;
+	u8       label_len;
+	u8       unicode_0_10[22];
+	u8       reserved[8];
+};
+
+/* unused entry hint information */
+struct uentry_t {
+	u32      dir;
+	s32       entry;
+	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];
+	u16      name_hash;
+	u8       name_len;
+};
+
+struct buf_cache_t {
+	struct buf_cache_t *next;
+	struct buf_cache_t *prev;
+	struct buf_cache_t *hash_next;
+	struct buf_cache_t *hash_prev;
+	s32                drv;
+	sector_t          sec;
+	u32               flag;
+	struct buffer_head   *buf_bh;
+};
+
+struct fs_func {
+	s32	(*alloc_cluster)(struct super_block *sb, s32 num_alloc,
+				 struct chain_t *p_chain);
+	void	(*free_cluster)(struct super_block *sb, struct chain_t *p_chain,
+				s32 do_relse);
+	s32	(*count_used_clusters)(struct super_block *sb);
+
+	s32	(*init_dir_entry)(struct super_block *sb, struct chain_t *p_dir,
+				  s32 entry, u32 type, u32 start_clu, u64 size);
+	s32	(*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);
+	s32	(*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);
+	void	(*delete_dir_entry)(struct super_block *sb,
+				    struct chain_t *p_dir, s32 entry,
+				    s32 offset, s32 num_entries);
+	void	(*get_uni_name_from_ext_entry)(struct super_block *sb,
+					       struct chain_t *p_dir, s32 entry,
+					       u16 *uniname);
+	s32	(*count_ext_entries)(struct super_block *sb,
+				     struct chain_t *p_dir, s32 entry,
+				     struct dentry_t *p_entry);
+	s32	(*calc_num_entries)(struct uni_name_t *p_uniname);
+
+	u32	(*get_entry_type)(struct dentry_t *p_entry);
+	void	(*set_entry_type)(struct dentry_t *p_entry, u32 type);
+	u32	(*get_entry_attr)(struct dentry_t *p_entry);
+	void	(*set_entry_attr)(struct dentry_t *p_entry, u32 attr);
+	u8	(*get_entry_flag)(struct dentry_t *p_entry);
+	void	(*set_entry_flag)(struct dentry_t *p_entry, u8 flag);
+	u32	(*get_entry_clu0)(struct dentry_t *p_entry);
+	void	(*set_entry_clu0)(struct dentry_t *p_entry, u32 clu0);
+	u64	(*get_entry_size)(struct dentry_t *p_entry);
+	void	(*set_entry_size)(struct dentry_t *p_entry, u64 size);
+	void	(*get_entry_time)(struct dentry_t *p_entry,
+				  struct timestamp_t *tp, u8 mode);
+	void	(*set_entry_time)(struct dentry_t *p_entry,
+				  struct timestamp_t *tp, u8 mode);
+};
+
+struct fs_info_t {
+	u32      drv;                    /* drive ID */
+	u32      vol_type;               /* volume FAT type */
+	u32      vol_id;                 /* volume serial number */
+
+	u64      num_sectors;            /* num of sectors in volume */
+	u32      num_clusters;           /* num of clusters in volume */
+	u32      cluster_size;           /* cluster size in bytes */
+	u32      cluster_size_bits;
+	u32      sectors_per_clu;        /* cluster size in sectors */
+	u32      sectors_per_clu_bits;
+
+	u32      PBR_sector;             /* PBR sector */
+	u32      FAT1_start_sector;      /* FAT1 start sector */
+	u32      FAT2_start_sector;      /* FAT2 start sector */
+	u32      root_start_sector;      /* root dir start sector */
+	u32      data_start_sector;      /* data area start sector */
+	u32      num_FAT_sectors;        /* num of FAT sectors */
+
+	u32      root_dir;               /* root dir cluster */
+	u32      dentries_in_root;       /* num of dentries in root dir */
+	u32      dentries_per_clu;       /* num of dentries per cluster */
+
+	u32      vol_flag;               /* volume dirty flag */
+	struct buffer_head *pbr_bh;         /* PBR sector */
+
+	u32      map_clu;                /* allocation bitmap start cluster */
+	u32      map_sectors;            /* num of allocation bitmap sectors */
+	struct buffer_head **vol_amap;      /* allocation bitmap */
+
+	u16 **vol_utbl;			/* upcase table */
+
+	u32 clu_srch_ptr;		/* cluster search pointer */
+	u32 used_clusters;		/* number of used clusters */
+	struct uentry_t hint_uentry;	/* unused entry hint information */
+
+	u32 dev_ejected;	/* block device operation error flag */
+
+	struct fs_func *fs_func;
+	struct semaphore v_sem;
+
+	/* FAT cache */
+	struct buf_cache_t FAT_cache_array[FAT_CACHE_SIZE];
+	struct buf_cache_t FAT_cache_lru_list;
+	struct buf_cache_t FAT_cache_hash_list[FAT_CACHE_HASH_SIZE];
+
+	/* buf cache */
+	struct buf_cache_t buf_cache_array[BUF_CACHE_SIZE];
+	struct buf_cache_t buf_cache_lru_list;
+	struct buf_cache_t buf_cache_hash_list[BUF_CACHE_HASH_SIZE];
+};
+
+#define ES_2_ENTRIES		2
+#define ES_3_ENTRIES		3
+#define ES_ALL_ENTRIES		0
+
+struct entry_set_cache_t {
+	/* sector number that contains file_entry */
+	sector_t sector;
+
+	/* byte offset in the sector */
+	s32 offset;
+
+	/*
+	 * flag in stream entry.
+	 * 01 for cluster chain,
+	 * 03 for contig. clusteres.
+	 */
+	s32 alloc_flag;
+
+	u32 num_entries;
+
+	/* __buf should be the last member */
+	void *__buf;
+};
+
+#define EXFAT_ERRORS_CONT	1	/* ignore error and continue */
+#define EXFAT_ERRORS_PANIC	2	/* panic on error */
+#define EXFAT_ERRORS_RO		3	/* remount r/o on error */
+
+/* ioctl command */
+#define EXFAT_IOCTL_GET_VOLUME_ID _IOR('r', 0x12, __u32)
+
+struct exfat_mount_options {
+	kuid_t fs_uid;
+	kgid_t fs_gid;
+	unsigned short fs_fmask;
+	unsigned short fs_dmask;
+
+	/* permission for setting the [am]time */
+	unsigned short allow_utime;
+
+	/* codepage for shortname conversions */
+	unsigned short codepage;
+
+	/* charset for filename input/display */
+	char *iocharset;
+
+	unsigned char casesensitive;
+
+	/* on error: continue, panic, remount-ro */
+	unsigned char errors;
+#ifdef CONFIG_EXFAT_DISCARD
+	/* flag on if -o dicard specified and device support discard() */
+	unsigned char discard;
+#endif /* CONFIG_EXFAT_DISCARD */
+};
+
+#define EXFAT_HASH_BITS		8
+#define EXFAT_HASH_SIZE		(1UL << EXFAT_HASH_BITS)
+
+/*
+ * EXFAT file system in-core superblock data
+ */
+struct bd_info_t {
+	s32 sector_size;	/* in bytes */
+	s32 sector_size_bits;
+	s32 sector_size_mask;
+
+	/* total number of sectors in this block device */
+	s32 num_sectors;
+
+	/* opened or not */
+	bool opened;
+};
+
+struct exfat_sb_info {
+	struct fs_info_t fs_info;
+	struct bd_info_t bd_info;
+
+	struct exfat_mount_options options;
+
+	int s_dirt;
+	struct mutex s_lock;
+	struct nls_table *nls_disk; /* Codepage used on disk */
+	struct nls_table *nls_io;   /* Charset used for input and display */
+
+	struct inode *fat_inode;
+
+	spinlock_t inode_hash_lock;
+	struct hlist_head inode_hashtable[EXFAT_HASH_SIZE];
+#ifdef CONFIG_EXFAT_KERNEL_DEBUG
+	long debug_flags;
+#endif /* CONFIG_EXFAT_KERNEL_DEBUG */
+};
+
+/*
+ * EXFAT file system inode data in memory
+ */
+struct exfat_inode_info {
+	struct file_id_t fid;
+	char  *target;
+	/* NOTE: mmu_private is 64bits, so must hold ->i_mutex to access */
+	loff_t mmu_private;	/* physically allocated size */
+	loff_t i_pos;		/* on-disk position of directory entry or 0 */
+	struct hlist_node i_hash_fat;	/* hash by i_location */
+	struct rw_semaphore truncate_lock;
+	struct inode vfs_inode;
+	struct rw_semaphore i_alloc_sem; /* protect bmap against truncate */
+};
+
+#define EXFAT_SB(sb)		((struct exfat_sb_info *)((sb)->s_fs_info))
+
+static inline struct exfat_inode_info *EXFAT_I(struct inode *inode)
+{
+	return container_of(inode, struct exfat_inode_info, vfs_inode);
+}
+
+/* NLS management function */
+u16 nls_upper(struct super_block *sb, u16 a);
+int nls_dosname_cmp(struct super_block *sb, u8 *a, u8 *b);
+int nls_uniname_cmp(struct super_block *sb, u16 *a, u16 *b);
+void nls_uniname_to_dosname(struct super_block *sb,
+			    struct dos_name_t *p_dosname,
+			    struct uni_name_t *p_uniname, bool *p_lossy);
+void nls_dosname_to_uniname(struct super_block *sb,
+			    struct uni_name_t *p_uniname,
+			    struct dos_name_t *p_dosname);
+void nls_uniname_to_cstring(struct super_block *sb, u8 *p_cstring,
+			    struct uni_name_t *p_uniname);
+void nls_cstring_to_uniname(struct super_block *sb,
+			    struct uni_name_t *p_uniname, u8 *p_cstring,
+			    bool *p_lossy);
+
+/* buffer cache management */
+void buf_init(struct super_block *sb);
+void buf_shutdown(struct super_block *sb);
+int FAT_read(struct super_block *sb, u32 loc, u32 *content);
+s32 FAT_write(struct super_block *sb, u32 loc, u32 content);
+u8 *FAT_getblk(struct super_block *sb, sector_t sec);
+void FAT_modify(struct super_block *sb, sector_t sec);
+void FAT_release_all(struct super_block *sb);
+void FAT_sync(struct super_block *sb);
+u8 *buf_getblk(struct super_block *sb, sector_t sec);
+void buf_modify(struct super_block *sb, sector_t sec);
+void buf_lock(struct super_block *sb, sector_t sec);
+void buf_unlock(struct super_block *sb, sector_t sec);
+void buf_release(struct super_block *sb, sector_t sec);
+void buf_release_all(struct super_block *sb);
+void buf_sync(struct super_block *sb);
+
+/* fs management functions */
+void fs_set_vol_flags(struct super_block *sb, u32 new_flag);
+void fs_error(struct super_block *sb);
+
+/* cluster management functions */
+s32 clear_cluster(struct super_block *sb, u32 clu);
+s32 fat_alloc_cluster(struct super_block *sb, s32 num_alloc,
+		      struct chain_t *p_chain);
+s32 exfat_alloc_cluster(struct super_block *sb, s32 num_alloc,
+			struct chain_t *p_chain);
+void fat_free_cluster(struct super_block *sb, struct chain_t *p_chain,
+		      s32 do_relse);
+void exfat_free_cluster(struct super_block *sb, struct chain_t *p_chain,
+			s32 do_relse);
+u32 find_last_cluster(struct super_block *sb, struct chain_t *p_chain);
+s32 count_num_clusters(struct super_block *sb, struct chain_t *dir);
+s32 fat_count_used_clusters(struct super_block *sb);
+s32 exfat_count_used_clusters(struct super_block *sb);
+void exfat_chain_cont_cluster(struct super_block *sb, u32 chain, s32 len);
+
+/* allocation bitmap management functions */
+s32 load_alloc_bitmap(struct super_block *sb);
+void free_alloc_bitmap(struct super_block *sb);
+s32 set_alloc_bitmap(struct super_block *sb, u32 clu);
+s32 clr_alloc_bitmap(struct super_block *sb, u32 clu);
+u32 test_alloc_bitmap(struct super_block *sb, u32 clu);
+void sync_alloc_bitmap(struct super_block *sb);
+
+/* upcase table management functions */
+s32 load_upcase_table(struct super_block *sb);
+void free_upcase_table(struct super_block *sb);
+
+/* dir entry management functions */
+u32 fat_get_entry_type(struct dentry_t *p_entry);
+u32 exfat_get_entry_type(struct dentry_t *p_entry);
+void fat_set_entry_type(struct dentry_t *p_entry, u32 type);
+void exfat_set_entry_type(struct dentry_t *p_entry, u32 type);
+u32 fat_get_entry_attr(struct dentry_t *p_entry);
+u32 exfat_get_entry_attr(struct dentry_t *p_entry);
+void fat_set_entry_attr(struct dentry_t *p_entry, u32 attr);
+void exfat_set_entry_attr(struct dentry_t *p_entry, u32 attr);
+u8 fat_get_entry_flag(struct dentry_t *p_entry);
+u8 exfat_get_entry_flag(struct dentry_t *p_entry);
+void fat_set_entry_flag(struct dentry_t *p_entry, u8 flag);
+void exfat_set_entry_flag(struct dentry_t *p_entry, u8 flag);
+u32 fat_get_entry_clu0(struct dentry_t *p_entry);
+u32 exfat_get_entry_clu0(struct dentry_t *p_entry);
+void fat_set_entry_clu0(struct dentry_t *p_entry, u32 start_clu);
+void exfat_set_entry_clu0(struct dentry_t *p_entry, u32 start_clu);
+u64 fat_get_entry_size(struct dentry_t *p_entry);
+u64 exfat_get_entry_size(struct dentry_t *p_entry);
+void fat_set_entry_size(struct dentry_t *p_entry, u64 size);
+void exfat_set_entry_size(struct dentry_t *p_entry, u64 size);
+struct timestamp_t *tm_current(struct timestamp_t *tm);
+void fat_get_entry_time(struct dentry_t *p_entry, struct timestamp_t *tp,
+			u8 mode);
+void exfat_get_entry_time(struct dentry_t *p_entry, struct timestamp_t *tp,
+			  u8 mode);
+void fat_set_entry_time(struct dentry_t *p_entry, struct timestamp_t *tp,
+			u8 mode);
+void exfat_set_entry_time(struct dentry_t *p_entry, struct timestamp_t *tp,
+			  u8 mode);
+s32 fat_init_dir_entry(struct super_block *sb, struct chain_t *p_dir, s32 entry,
+		       u32 type, u32 start_clu, u64 size);
+s32 exfat_init_dir_entry(struct super_block *sb, struct chain_t *p_dir,
+			 s32 entry, u32 type, u32 start_clu, u64 size);
+s32 fat_init_ext_dir_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);
+s32 exfat_init_ext_dir_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);
+void init_dos_entry(struct dos_dentry_t *ep, u32 type, u32 start_clu);
+void init_ext_entry(struct ext_dentry_t *ep, s32 order, u8 chksum,
+		    u16 *uniname);
+void init_file_entry(struct file_dentry_t *ep, u32 type);
+void init_strm_entry(struct strm_dentry_t *ep, u8 flags, u32 start_clu,
+		     u64 size);
+void init_name_entry(struct name_dentry_t *ep, u16 *uniname);
+void fat_delete_dir_entry(struct super_block *sb, struct chain_t *p_dir,
+			  s32 entry, s32 order, s32 num_entries);
+void exfat_delete_dir_entry(struct super_block *sb, struct chain_t *p_dir,
+			    s32 entry, s32 order, s32 num_entries);
+
+s32 find_location(struct super_block *sb, struct chain_t *p_dir, s32 entry,
+		  sector_t *sector, s32 *offset);
+struct dentry_t *get_entry_with_sector(struct super_block *sb, sector_t sector,
+				       s32 offset);
+struct dentry_t *get_entry_in_dir(struct super_block *sb, struct chain_t *p_dir,
+				  s32 entry, sector_t *sector);
+struct entry_set_cache_t *get_entry_set_in_dir(struct super_block *sb,
+					       struct chain_t *p_dir, s32 entry,
+					       u32 type,
+					       struct dentry_t **file_ep);
+void release_entry_set(struct entry_set_cache_t *es);
+s32 write_whole_entry_set(struct super_block *sb, struct entry_set_cache_t *es);
+s32 write_partial_entries_in_entry_set(struct super_block *sb,
+				       struct entry_set_cache_t *es,
+				       struct dentry_t *ep, u32 count);
+s32 search_deleted_or_unused_entry(struct super_block *sb,
+				   struct chain_t *p_dir, s32 num_entries);
+s32 find_empty_entry(struct inode *inode, struct chain_t *p_dir,
+		     s32 num_entries);
+s32 fat_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);
+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);
+s32 fat_count_ext_entries(struct super_block *sb, struct chain_t *p_dir,
+			  s32 entry, struct dentry_t *p_entry);
+s32 exfat_count_ext_entries(struct super_block *sb, struct chain_t *p_dir,
+			    s32 entry, struct dentry_t *p_entry);
+s32 count_dos_name_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,
+					struct entry_set_cache_t *es);
+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);
+void get_uni_name_from_dos_entry(struct super_block *sb,
+				 struct dos_dentry_t *ep,
+				 struct uni_name_t *p_uniname, u8 mode);
+void fat_get_uni_name_from_ext_entry(struct super_block *sb,
+				     struct chain_t *p_dir, s32 entry,
+				     u16 *uniname);
+void exfat_get_uni_name_from_ext_entry(struct super_block *sb,
+				       struct chain_t *p_dir, s32 entry,
+				       u16 *uniname);
+s32 extract_uni_name_from_ext_entry(struct ext_dentry_t *ep,
+				    u16 *uniname, s32 order);
+s32 extract_uni_name_from_name_entry(struct name_dentry_t *ep,
+				     u16 *uniname, s32 order);
+s32 fat_generate_dos_name(struct super_block *sb, struct chain_t *p_dir,
+			  struct dos_name_t *p_dosname);
+void fat_attach_count_to_dos_name(u8 *dosname, s32 count);
+s32 fat_calc_num_entries(struct uni_name_t *p_uniname);
+s32 exfat_calc_num_entries(struct uni_name_t *p_uniname);
+u8 calc_checksum_1byte(void *data, s32 len, u8 chksum);
+u16 calc_checksum_2byte(void *data, s32 len, u16 chksum, s32 type);
+u32 calc_checksum_4byte(void *data, s32 len, u32 chksum, s32 type);
+
+/* name resolution functions */
+s32 resolve_path(struct inode *inode, char *path, struct chain_t *p_dir,
+		 struct uni_name_t *p_uniname);
+s32 resolve_name(u8 *name, u8 **arg);
+
+/* file operation functions */
+s32 fat16_mount(struct super_block *sb, struct pbr_sector_t *p_pbr);
+s32 fat32_mount(struct super_block *sb, struct pbr_sector_t *p_pbr);
+s32 exfat_mount(struct super_block *sb, struct pbr_sector_t *p_pbr);
+s32 create_dir(struct inode *inode, struct chain_t *p_dir,
+	       struct uni_name_t *p_uniname, struct file_id_t *fid);
+s32 create_file(struct inode *inode, struct chain_t *p_dir,
+		struct uni_name_t *p_uniname, u8 mode, struct file_id_t *fid);
+void remove_file(struct inode *inode, struct chain_t *p_dir, s32 entry);
+s32 rename_file(struct inode *inode, struct chain_t *p_dir, s32 old_entry,
+		struct uni_name_t *p_uniname, struct file_id_t *fid);
+s32 move_file(struct inode *inode, struct chain_t *p_olddir, s32 oldentry,
+	      struct chain_t *p_newdir, struct uni_name_t *p_uniname,
+	      struct file_id_t *fid);
+
+/* sector read/write functions */
+int sector_read(struct super_block *sb, sector_t sec,
+		struct buffer_head **bh, bool read);
+int sector_write(struct super_block *sb, sector_t sec,
+		 struct buffer_head *bh, bool sync);
+int multi_sector_read(struct super_block *sb, sector_t sec,
+		      struct buffer_head **bh, s32 num_secs, bool read);
+int multi_sector_write(struct super_block *sb, sector_t sec,
+		       struct buffer_head *bh, s32 num_secs, bool sync);
+
+void bdev_open(struct super_block *sb);
+void bdev_close(struct super_block *sb);
+int bdev_read(struct super_block *sb, sector_t secno,
+	      struct buffer_head **bh, u32 num_secs, bool read);
+int bdev_write(struct super_block *sb, sector_t secno,
+	       struct buffer_head *bh, u32 num_secs, bool sync);
+int bdev_sync(struct super_block *sb);
+
+extern const u8 uni_upcase[];
+#endif /* _EXFAT_H */
diff --git a/drivers/staging/exfat/exfat_blkdev.c b/drivers/staging/exfat/exfat_blkdev.c
new file mode 100644
index 000000000000..f086c75e7076
--- /dev/null
+++ b/drivers/staging/exfat/exfat_blkdev.c
@@ -0,0 +1,136 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *  Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
+ */
+
+#include <linux/blkdev.h>
+#include <linux/buffer_head.h>
+#include <linux/fs.h>
+#include "exfat.h"
+
+void bdev_open(struct super_block *sb)
+{
+	struct bd_info_t *p_bd = &(EXFAT_SB(sb)->bd_info);
+
+	if (p_bd->opened)
+		return;
+
+	p_bd->sector_size      = bdev_logical_block_size(sb->s_bdev);
+	p_bd->sector_size_bits = ilog2(p_bd->sector_size);
+	p_bd->sector_size_mask = p_bd->sector_size - 1;
+	p_bd->num_sectors      = i_size_read(sb->s_bdev->bd_inode) >>
+				 p_bd->sector_size_bits;
+	p_bd->opened = true;
+}
+
+void bdev_close(struct super_block *sb)
+{
+	struct bd_info_t *p_bd = &(EXFAT_SB(sb)->bd_info);
+
+	p_bd->opened = false;
+}
+
+int bdev_read(struct super_block *sb, sector_t secno, struct buffer_head **bh,
+	      u32 num_secs, bool read)
+{
+	struct bd_info_t *p_bd = &(EXFAT_SB(sb)->bd_info);
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+#ifdef CONFIG_EXFAT_KERNEL_DEBUG
+	struct exfat_sb_info *sbi = EXFAT_SB(sb);
+	long flags = sbi->debug_flags;
+
+	if (flags & EXFAT_DEBUGFLAGS_ERROR_RW)
+		return FFS_MEDIAERR;
+#endif /* CONFIG_EXFAT_KERNEL_DEBUG */
+
+	if (!p_bd->opened)
+		return FFS_MEDIAERR;
+
+	if (*bh)
+		__brelse(*bh);
+
+	if (read)
+		*bh = __bread(sb->s_bdev, secno,
+			      num_secs << p_bd->sector_size_bits);
+	else
+		*bh = __getblk(sb->s_bdev, secno,
+			       num_secs << p_bd->sector_size_bits);
+
+	if (*bh)
+		return 0;
+
+	WARN(!p_fs->dev_ejected,
+	     "[EXFAT] No bh, device seems wrong or to be ejected.\n");
+
+	return FFS_MEDIAERR;
+}
+
+int bdev_write(struct super_block *sb, sector_t secno, struct buffer_head *bh,
+	       u32 num_secs, bool sync)
+{
+	s32 count;
+	struct buffer_head *bh2;
+	struct bd_info_t *p_bd = &(EXFAT_SB(sb)->bd_info);
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+#ifdef CONFIG_EXFAT_KERNEL_DEBUG
+	struct exfat_sb_info *sbi = EXFAT_SB(sb);
+	long flags = sbi->debug_flags;
+
+	if (flags & EXFAT_DEBUGFLAGS_ERROR_RW)
+		return FFS_MEDIAERR;
+#endif /* CONFIG_EXFAT_KERNEL_DEBUG */
+
+	if (!p_bd->opened)
+		return FFS_MEDIAERR;
+
+	if (secno == bh->b_blocknr) {
+		lock_buffer(bh);
+		set_buffer_uptodate(bh);
+		mark_buffer_dirty(bh);
+		unlock_buffer(bh);
+		if (sync && (sync_dirty_buffer(bh) != 0))
+			return FFS_MEDIAERR;
+	} else {
+		count = num_secs << p_bd->sector_size_bits;
+
+		bh2 = __getblk(sb->s_bdev, secno, count);
+		if (!bh2)
+			goto no_bh;
+
+		lock_buffer(bh2);
+		memcpy(bh2->b_data, bh->b_data, count);
+		set_buffer_uptodate(bh2);
+		mark_buffer_dirty(bh2);
+		unlock_buffer(bh2);
+		if (sync && (sync_dirty_buffer(bh2) != 0)) {
+			__brelse(bh2);
+			goto no_bh;
+		}
+		__brelse(bh2);
+	}
+
+	return 0;
+
+no_bh:
+	WARN(!p_fs->dev_ejected,
+	     "[EXFAT] No bh, device seems wrong or to be ejected.\n");
+
+	return FFS_MEDIAERR;
+}
+
+int bdev_sync(struct super_block *sb)
+{
+	struct bd_info_t *p_bd = &(EXFAT_SB(sb)->bd_info);
+#ifdef CONFIG_EXFAT_KERNEL_DEBUG
+	struct exfat_sb_info *sbi = EXFAT_SB(sb);
+	long flags = sbi->debug_flags;
+
+	if (flags & EXFAT_DEBUGFLAGS_ERROR_RW)
+		return FFS_MEDIAERR;
+#endif /* CONFIG_EXFAT_KERNEL_DEBUG */
+
+	if (!p_bd->opened)
+		return FFS_MEDIAERR;
+
+	return sync_blockdev(sb->s_bdev);
+}
diff --git a/drivers/staging/exfat/exfat_cache.c b/drivers/staging/exfat/exfat_cache.c
new file mode 100644
index 000000000000..f05d692c2b1e
--- /dev/null
+++ b/drivers/staging/exfat/exfat_cache.c
@@ -0,0 +1,722 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *  Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
+ */
+
+#include <linux/buffer_head.h>
+#include <linux/fs.h>
+#include <linux/mutex.h>
+#include "exfat.h"
+
+#define LOCKBIT		0x01
+#define DIRTYBIT	0x02
+
+/* Local variables */
+static DEFINE_SEMAPHORE(f_sem);
+static DEFINE_SEMAPHORE(b_sem);
+
+static struct buf_cache_t *FAT_cache_find(struct super_block *sb, sector_t sec)
+{
+	s32 off;
+	struct buf_cache_t *bp, *hp;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+
+	off = (sec +
+	       (sec >> p_fs->sectors_per_clu_bits)) & (FAT_CACHE_HASH_SIZE - 1);
+
+	hp = &p_fs->FAT_cache_hash_list[off];
+	for (bp = hp->hash_next; bp != hp; bp = bp->hash_next) {
+		if ((bp->drv == p_fs->drv) && (bp->sec == sec)) {
+			WARN(!bp->buf_bh,
+			     "[EXFAT] FAT_cache has no bh. It will make system panic.\n");
+
+			touch_buffer(bp->buf_bh);
+			return bp;
+		}
+	}
+	return NULL;
+}
+
+static void push_to_mru(struct buf_cache_t *bp, struct buf_cache_t *list)
+{
+	bp->next = list->next;
+	bp->prev = list;
+	list->next->prev = bp;
+	list->next = bp;
+}
+
+static void push_to_lru(struct buf_cache_t *bp, struct buf_cache_t *list)
+{
+	bp->prev = list->prev;
+	bp->next = list;
+	list->prev->next = bp;
+	list->prev = bp;
+}
+
+static void move_to_mru(struct buf_cache_t *bp, struct buf_cache_t *list)
+{
+	bp->prev->next = bp->next;
+	bp->next->prev = bp->prev;
+	push_to_mru(bp, list);
+}
+
+static void move_to_lru(struct buf_cache_t *bp, struct buf_cache_t *list)
+{
+	bp->prev->next = bp->next;
+	bp->next->prev = bp->prev;
+	push_to_lru(bp, list);
+}
+
+static struct buf_cache_t *FAT_cache_get(struct super_block *sb, sector_t sec)
+{
+	struct buf_cache_t *bp;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+
+	bp = p_fs->FAT_cache_lru_list.prev;
+
+	move_to_mru(bp, &p_fs->FAT_cache_lru_list);
+	return bp;
+}
+
+static void FAT_cache_insert_hash(struct super_block *sb,
+				  struct buf_cache_t *bp)
+{
+	s32 off;
+	struct buf_cache_t *hp;
+	struct fs_info_t *p_fs;
+
+	p_fs = &(EXFAT_SB(sb)->fs_info);
+	off = (bp->sec +
+	       (bp->sec >> p_fs->sectors_per_clu_bits)) &
+		(FAT_CACHE_HASH_SIZE - 1);
+
+	hp = &p_fs->FAT_cache_hash_list[off];
+	bp->hash_next = hp->hash_next;
+	bp->hash_prev = hp;
+	hp->hash_next->hash_prev = bp;
+	hp->hash_next = bp;
+}
+
+static void FAT_cache_remove_hash(struct buf_cache_t *bp)
+{
+	(bp->hash_prev)->hash_next = bp->hash_next;
+	(bp->hash_next)->hash_prev = bp->hash_prev;
+}
+
+static void buf_cache_insert_hash(struct super_block *sb,
+				  struct buf_cache_t *bp)
+{
+	s32 off;
+	struct buf_cache_t *hp;
+	struct fs_info_t *p_fs;
+
+	p_fs = &(EXFAT_SB(sb)->fs_info);
+	off = (bp->sec +
+	       (bp->sec >> p_fs->sectors_per_clu_bits)) &
+		(BUF_CACHE_HASH_SIZE - 1);
+
+	hp = &p_fs->buf_cache_hash_list[off];
+	bp->hash_next = hp->hash_next;
+	bp->hash_prev = hp;
+	hp->hash_next->hash_prev = bp;
+	hp->hash_next = bp;
+}
+
+static void buf_cache_remove_hash(struct buf_cache_t *bp)
+{
+	(bp->hash_prev)->hash_next = bp->hash_next;
+	(bp->hash_next)->hash_prev = bp->hash_prev;
+}
+
+void buf_init(struct super_block *sb)
+{
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+
+	int i;
+
+	/* LRU list */
+	p_fs->FAT_cache_lru_list.next = &p_fs->FAT_cache_lru_list;
+	p_fs->FAT_cache_lru_list.prev = &p_fs->FAT_cache_lru_list;
+
+	for (i = 0; i < FAT_CACHE_SIZE; i++) {
+		p_fs->FAT_cache_array[i].drv = -1;
+		p_fs->FAT_cache_array[i].sec = ~0;
+		p_fs->FAT_cache_array[i].flag = 0;
+		p_fs->FAT_cache_array[i].buf_bh = NULL;
+		p_fs->FAT_cache_array[i].prev = NULL;
+		p_fs->FAT_cache_array[i].next = NULL;
+		push_to_mru(&p_fs->FAT_cache_array[i],
+			    &p_fs->FAT_cache_lru_list);
+	}
+
+	p_fs->buf_cache_lru_list.next = &p_fs->buf_cache_lru_list;
+	p_fs->buf_cache_lru_list.prev = &p_fs->buf_cache_lru_list;
+
+	for (i = 0; i < BUF_CACHE_SIZE; i++) {
+		p_fs->buf_cache_array[i].drv = -1;
+		p_fs->buf_cache_array[i].sec = ~0;
+		p_fs->buf_cache_array[i].flag = 0;
+		p_fs->buf_cache_array[i].buf_bh = NULL;
+		p_fs->buf_cache_array[i].prev = NULL;
+		p_fs->buf_cache_array[i].next = NULL;
+		push_to_mru(&p_fs->buf_cache_array[i],
+			    &p_fs->buf_cache_lru_list);
+	}
+
+	/* HASH list */
+	for (i = 0; i < FAT_CACHE_HASH_SIZE; i++) {
+		p_fs->FAT_cache_hash_list[i].drv = -1;
+		p_fs->FAT_cache_hash_list[i].sec = ~0;
+		p_fs->FAT_cache_hash_list[i].hash_next =
+			&p_fs->FAT_cache_hash_list[i];
+		p_fs->FAT_cache_hash_list[i].hash_prev =
+			&p_fs->FAT_cache_hash_list[i];
+	}
+
+	for (i = 0; i < FAT_CACHE_SIZE; i++)
+		FAT_cache_insert_hash(sb, &p_fs->FAT_cache_array[i]);
+
+	for (i = 0; i < BUF_CACHE_HASH_SIZE; i++) {
+		p_fs->buf_cache_hash_list[i].drv = -1;
+		p_fs->buf_cache_hash_list[i].sec = ~0;
+		p_fs->buf_cache_hash_list[i].hash_next =
+			&p_fs->buf_cache_hash_list[i];
+		p_fs->buf_cache_hash_list[i].hash_prev =
+			&p_fs->buf_cache_hash_list[i];
+	}
+
+	for (i = 0; i < BUF_CACHE_SIZE; i++)
+		buf_cache_insert_hash(sb, &p_fs->buf_cache_array[i]);
+}
+
+void buf_shutdown(struct super_block *sb)
+{
+}
+
+static int __FAT_read(struct super_block *sb, u32 loc, u32 *content)
+{
+	s32 off;
+	u32 _content;
+	sector_t sec;
+	u8 *fat_sector, *fat_entry;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+	struct bd_info_t *p_bd = &(EXFAT_SB(sb)->bd_info);
+
+	if (p_fs->vol_type == FAT12) {
+		sec = p_fs->FAT1_start_sector +
+			((loc + (loc >> 1)) >> p_bd->sector_size_bits);
+		off = (loc + (loc >> 1)) & p_bd->sector_size_mask;
+
+		if (off == (p_bd->sector_size - 1)) {
+			fat_sector = FAT_getblk(sb, sec);
+			if (!fat_sector)
+				return -1;
+
+			_content = (u32)fat_sector[off];
+
+			fat_sector = FAT_getblk(sb, ++sec);
+			if (!fat_sector)
+				return -1;
+
+			_content |= (u32)fat_sector[0] << 8;
+		} else {
+			fat_sector = FAT_getblk(sb, sec);
+			if (!fat_sector)
+				return -1;
+
+			fat_entry = &fat_sector[off];
+			_content = GET16(fat_entry);
+		}
+
+		if (loc & 1)
+			_content >>= 4;
+
+		_content &= 0x00000FFF;
+
+		if (_content >= CLUSTER_16(0x0FF8)) {
+			*content = CLUSTER_32(~0);
+			return 0;
+		}
+		*content = CLUSTER_32(_content);
+		return 0;
+	} else if (p_fs->vol_type == FAT16) {
+		sec = p_fs->FAT1_start_sector +
+			(loc >> (p_bd->sector_size_bits - 1));
+		off = (loc << 1) & p_bd->sector_size_mask;
+
+		fat_sector = FAT_getblk(sb, sec);
+		if (!fat_sector)
+			return -1;
+
+		fat_entry = &fat_sector[off];
+
+		_content = GET16_A(fat_entry);
+
+		_content &= 0x0000FFFF;
+
+		if (_content >= CLUSTER_16(0xFFF8)) {
+			*content = CLUSTER_32(~0);
+			return 0;
+		}
+		*content = CLUSTER_32(_content);
+		return 0;
+	} else if (p_fs->vol_type == FAT32) {
+		sec = p_fs->FAT1_start_sector +
+			(loc >> (p_bd->sector_size_bits - 2));
+		off = (loc << 2) & p_bd->sector_size_mask;
+
+		fat_sector = FAT_getblk(sb, sec);
+		if (!fat_sector)
+			return -1;
+
+		fat_entry = &fat_sector[off];
+
+		_content = GET32_A(fat_entry);
+
+		_content &= 0x0FFFFFFF;
+
+		if (_content >= CLUSTER_32(0x0FFFFFF8)) {
+			*content = CLUSTER_32(~0);
+			return 0;
+		}
+		*content = CLUSTER_32(_content);
+		return 0;
+	} else if (p_fs->vol_type == EXFAT) {
+		sec = p_fs->FAT1_start_sector +
+			(loc >> (p_bd->sector_size_bits - 2));
+		off = (loc << 2) & p_bd->sector_size_mask;
+
+		fat_sector = FAT_getblk(sb, sec);
+		if (!fat_sector)
+			return -1;
+
+		fat_entry = &fat_sector[off];
+		_content = GET32_A(fat_entry);
+
+		if (_content >= CLUSTER_32(0xFFFFFFF8)) {
+			*content = CLUSTER_32(~0);
+			return 0;
+		}
+		*content = CLUSTER_32(_content);
+		return 0;
+	}
+
+	/* Unknown volume type, throw in the towel and go home */
+	*content = CLUSTER_32(~0);
+	return 0;
+}
+
+/* in : sb, loc
+ * out: content
+ * returns 0 on success
+ *            -1 on error
+ */
+int FAT_read(struct super_block *sb, u32 loc, u32 *content)
+{
+	s32 ret;
+
+	down(&f_sem);
+	ret = __FAT_read(sb, loc, content);
+	up(&f_sem);
+
+	return ret;
+}
+
+static s32 __FAT_write(struct super_block *sb, u32 loc, u32 content)
+{
+	s32 off;
+	sector_t sec;
+	u8 *fat_sector, *fat_entry;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+	struct bd_info_t *p_bd = &(EXFAT_SB(sb)->bd_info);
+
+	if (p_fs->vol_type == FAT12) {
+		content &= 0x00000FFF;
+
+		sec = p_fs->FAT1_start_sector +
+			((loc + (loc >> 1)) >> p_bd->sector_size_bits);
+		off = (loc + (loc >> 1)) & p_bd->sector_size_mask;
+
+		fat_sector = FAT_getblk(sb, sec);
+		if (!fat_sector)
+			return -1;
+
+		if (loc & 1) { /* odd */
+			content <<= 4;
+
+			if (off == (p_bd->sector_size - 1)) {
+				fat_sector[off] = (u8)(content |
+						       (fat_sector[off] &
+							0x0F));
+				FAT_modify(sb, sec);
+
+				fat_sector = FAT_getblk(sb, ++sec);
+				if (!fat_sector)
+					return -1;
+
+				fat_sector[0] = (u8)(content >> 8);
+			} else {
+				fat_entry = &fat_sector[off];
+				content |= GET16(fat_entry) & 0x000F;
+
+				SET16(fat_entry, content);
+			}
+		} else { /* even */
+			fat_sector[off] = (u8)(content);
+
+			if (off == (p_bd->sector_size - 1)) {
+				fat_sector[off] = (u8)(content);
+				FAT_modify(sb, sec);
+
+				fat_sector = FAT_getblk(sb, ++sec);
+				fat_sector[0] = (u8)((fat_sector[0] & 0xF0) |
+						     (content >> 8));
+			} else {
+				fat_entry = &fat_sector[off];
+				content |= GET16(fat_entry) & 0xF000;
+
+				SET16(fat_entry, content);
+			}
+		}
+	}
+
+	else if (p_fs->vol_type == FAT16) {
+		content &= 0x0000FFFF;
+
+		sec = p_fs->FAT1_start_sector + (loc >>
+						 (p_bd->sector_size_bits - 1));
+		off = (loc << 1) & p_bd->sector_size_mask;
+
+		fat_sector = FAT_getblk(sb, sec);
+		if (!fat_sector)
+			return -1;
+
+		fat_entry = &fat_sector[off];
+
+		SET16_A(fat_entry, content);
+	} else if (p_fs->vol_type == FAT32) {
+		content &= 0x0FFFFFFF;
+
+		sec = p_fs->FAT1_start_sector + (loc >>
+						 (p_bd->sector_size_bits - 2));
+		off = (loc << 2) & p_bd->sector_size_mask;
+
+		fat_sector = FAT_getblk(sb, sec);
+		if (!fat_sector)
+			return -1;
+
+		fat_entry = &fat_sector[off];
+
+		content |= GET32_A(fat_entry) & 0xF0000000;
+
+		SET32_A(fat_entry, content);
+	} else { /* p_fs->vol_type == EXFAT */
+		sec = p_fs->FAT1_start_sector + (loc >>
+						 (p_bd->sector_size_bits - 2));
+		off = (loc << 2) & p_bd->sector_size_mask;
+
+		fat_sector = FAT_getblk(sb, sec);
+		if (!fat_sector)
+			return -1;
+
+		fat_entry = &fat_sector[off];
+
+		SET32_A(fat_entry, content);
+	}
+
+	FAT_modify(sb, sec);
+	return 0;
+}
+
+int FAT_write(struct super_block *sb, u32 loc, u32 content)
+{
+	s32 ret;
+
+	down(&f_sem);
+	ret = __FAT_write(sb, loc, content);
+	up(&f_sem);
+
+	return ret;
+}
+
+u8 *FAT_getblk(struct super_block *sb, sector_t sec)
+{
+	struct buf_cache_t *bp;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+
+	bp = FAT_cache_find(sb, sec);
+	if (bp) {
+		move_to_mru(bp, &p_fs->FAT_cache_lru_list);
+		return bp->buf_bh->b_data;
+	}
+
+	bp = FAT_cache_get(sb, sec);
+
+	FAT_cache_remove_hash(bp);
+
+	bp->drv = p_fs->drv;
+	bp->sec = sec;
+	bp->flag = 0;
+
+	FAT_cache_insert_hash(sb, bp);
+
+	if (sector_read(sb, sec, &bp->buf_bh, 1) != FFS_SUCCESS) {
+		FAT_cache_remove_hash(bp);
+		bp->drv = -1;
+		bp->sec = ~0;
+		bp->flag = 0;
+		bp->buf_bh = NULL;
+
+		move_to_lru(bp, &p_fs->FAT_cache_lru_list);
+		return NULL;
+	}
+
+	return bp->buf_bh->b_data;
+}
+
+void FAT_modify(struct super_block *sb, sector_t sec)
+{
+	struct buf_cache_t *bp;
+
+	bp = FAT_cache_find(sb, sec);
+	if (bp)
+		sector_write(sb, sec, bp->buf_bh, 0);
+}
+
+void FAT_release_all(struct super_block *sb)
+{
+	struct buf_cache_t *bp;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+
+	down(&f_sem);
+
+	bp = p_fs->FAT_cache_lru_list.next;
+	while (bp != &p_fs->FAT_cache_lru_list) {
+		if (bp->drv == p_fs->drv) {
+			bp->drv = -1;
+			bp->sec = ~0;
+			bp->flag = 0;
+
+			if (bp->buf_bh) {
+				__brelse(bp->buf_bh);
+				bp->buf_bh = NULL;
+			}
+		}
+		bp = bp->next;
+	}
+
+	up(&f_sem);
+}
+
+void FAT_sync(struct super_block *sb)
+{
+	struct buf_cache_t *bp;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+
+	down(&f_sem);
+
+	bp = p_fs->FAT_cache_lru_list.next;
+	while (bp != &p_fs->FAT_cache_lru_list) {
+		if ((bp->drv == p_fs->drv) && (bp->flag & DIRTYBIT)) {
+			sync_dirty_buffer(bp->buf_bh);
+			bp->flag &= ~(DIRTYBIT);
+		}
+		bp = bp->next;
+	}
+
+	up(&f_sem);
+}
+
+static struct buf_cache_t *buf_cache_find(struct super_block *sb, sector_t sec)
+{
+	s32 off;
+	struct buf_cache_t *bp, *hp;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+
+	off = (sec + (sec >> p_fs->sectors_per_clu_bits)) &
+		(BUF_CACHE_HASH_SIZE - 1);
+
+	hp = &p_fs->buf_cache_hash_list[off];
+	for (bp = hp->hash_next; bp != hp; bp = bp->hash_next) {
+		if ((bp->drv == p_fs->drv) && (bp->sec == sec)) {
+			touch_buffer(bp->buf_bh);
+			return bp;
+		}
+	}
+	return NULL;
+}
+
+static struct buf_cache_t *buf_cache_get(struct super_block *sb, sector_t sec)
+{
+	struct buf_cache_t *bp;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+
+	bp = p_fs->buf_cache_lru_list.prev;
+	while (bp->flag & LOCKBIT)
+		bp = bp->prev;
+
+	move_to_mru(bp, &p_fs->buf_cache_lru_list);
+	return bp;
+}
+
+static u8 *__buf_getblk(struct super_block *sb, sector_t sec)
+{
+	struct buf_cache_t *bp;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+
+	bp = buf_cache_find(sb, sec);
+	if (bp) {
+		move_to_mru(bp, &p_fs->buf_cache_lru_list);
+		return bp->buf_bh->b_data;
+	}
+
+	bp = buf_cache_get(sb, sec);
+
+	buf_cache_remove_hash(bp);
+
+	bp->drv = p_fs->drv;
+	bp->sec = sec;
+	bp->flag = 0;
+
+	buf_cache_insert_hash(sb, bp);
+
+	if (sector_read(sb, sec, &bp->buf_bh, 1) != FFS_SUCCESS) {
+		buf_cache_remove_hash(bp);
+		bp->drv = -1;
+		bp->sec = ~0;
+		bp->flag = 0;
+		bp->buf_bh = NULL;
+
+		move_to_lru(bp, &p_fs->buf_cache_lru_list);
+		return NULL;
+	}
+
+	return bp->buf_bh->b_data;
+}
+
+u8 *buf_getblk(struct super_block *sb, sector_t sec)
+{
+	u8 *buf;
+
+	down(&b_sem);
+	buf = __buf_getblk(sb, sec);
+	up(&b_sem);
+
+	return buf;
+}
+
+void buf_modify(struct super_block *sb, sector_t sec)
+{
+	struct buf_cache_t *bp;
+
+	down(&b_sem);
+
+	bp = buf_cache_find(sb, sec);
+	if (likely(bp))
+		sector_write(sb, sec, bp->buf_bh, 0);
+
+	WARN(!bp, "[EXFAT] failed to find buffer_cache(sector:%llu).\n",
+	     (unsigned long long)sec);
+
+	up(&b_sem);
+}
+
+void buf_lock(struct super_block *sb, sector_t sec)
+{
+	struct buf_cache_t *bp;
+
+	down(&b_sem);
+
+	bp = buf_cache_find(sb, sec);
+	if (likely(bp))
+		bp->flag |= LOCKBIT;
+
+	WARN(!bp, "[EXFAT] failed to find buffer_cache(sector:%llu).\n",
+	     (unsigned long long)sec);
+
+	up(&b_sem);
+}
+
+void buf_unlock(struct super_block *sb, sector_t sec)
+{
+	struct buf_cache_t *bp;
+
+	down(&b_sem);
+
+	bp = buf_cache_find(sb, sec);
+	if (likely(bp))
+		bp->flag &= ~(LOCKBIT);
+
+	WARN(!bp, "[EXFAT] failed to find buffer_cache(sector:%llu).\n",
+	     (unsigned long long)sec);
+
+	up(&b_sem);
+}
+
+void buf_release(struct super_block *sb, sector_t sec)
+{
+	struct buf_cache_t *bp;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+
+	down(&b_sem);
+
+	bp = buf_cache_find(sb, sec);
+	if (likely(bp)) {
+		bp->drv = -1;
+		bp->sec = ~0;
+		bp->flag = 0;
+
+		if (bp->buf_bh) {
+			__brelse(bp->buf_bh);
+			bp->buf_bh = NULL;
+		}
+
+		move_to_lru(bp, &p_fs->buf_cache_lru_list);
+	}
+
+	up(&b_sem);
+}
+
+void buf_release_all(struct super_block *sb)
+{
+	struct buf_cache_t *bp;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+
+	down(&b_sem);
+
+	bp = p_fs->buf_cache_lru_list.next;
+	while (bp != &p_fs->buf_cache_lru_list) {
+		if (bp->drv == p_fs->drv) {
+			bp->drv = -1;
+			bp->sec = ~0;
+			bp->flag = 0;
+
+			if (bp->buf_bh) {
+				__brelse(bp->buf_bh);
+				bp->buf_bh = NULL;
+			}
+		}
+		bp = bp->next;
+	}
+
+	up(&b_sem);
+}
+
+void buf_sync(struct super_block *sb)
+{
+	struct buf_cache_t *bp;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+
+	down(&b_sem);
+
+	bp = p_fs->buf_cache_lru_list.next;
+	while (bp != &p_fs->buf_cache_lru_list) {
+		if ((bp->drv == p_fs->drv) && (bp->flag & DIRTYBIT)) {
+			sync_dirty_buffer(bp->buf_bh);
+			bp->flag &= ~(DIRTYBIT);
+		}
+		bp = bp->next;
+	}
+
+	up(&b_sem);
+}
diff --git a/drivers/staging/exfat/exfat_core.c b/drivers/staging/exfat/exfat_core.c
new file mode 100644
index 000000000000..9f76ca175c80
--- /dev/null
+++ b/drivers/staging/exfat/exfat_core.c
@@ -0,0 +1,3704 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *  Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
+ */
+
+#include <linux/types.h>
+#include <linux/buffer_head.h>
+#include <linux/fs.h>
+#include <linux/mutex.h>
+#include <linux/blkdev.h>
+#include <linux/slab.h>
+#include "exfat.h"
+
+
+static void __set_sb_dirty(struct super_block *sb)
+{
+	struct exfat_sb_info *sbi = EXFAT_SB(sb);
+
+	sbi->s_dirt = 1;
+}
+
+static u8 name_buf[MAX_PATH_LENGTH * MAX_CHARSET_SIZE];
+
+static char *reserved_names[] = {
+	"AUX     ", "CON     ", "NUL     ", "PRN     ",
+	"COM1    ", "COM2    ", "COM3    ", "COM4    ",
+	"COM5    ", "COM6    ", "COM7    ", "COM8    ", "COM9    ",
+	"LPT1    ", "LPT2    ", "LPT3    ", "LPT4    ",
+	"LPT5    ", "LPT6    ", "LPT7    ", "LPT8    ", "LPT9    ",
+	NULL
+};
+
+static u8 free_bit[] = {
+	0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, /*   0 ~  19 */
+	0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 5, 0, 1, 0, 2, 0, 1, 0, 3, /*  20 ~  39 */
+	0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, /*  40 ~  59 */
+	0, 1, 0, 6, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, /*  60 ~  79 */
+	0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 5, 0, 1, 0, 2, /*  80 ~  99 */
+	0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 3, /* 100 ~ 119 */
+	0, 1, 0, 2, 0, 1, 0, 7, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, /* 120 ~ 139 */
+	0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 5, /* 140 ~ 159 */
+	0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, /* 160 ~ 179 */
+	0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 6, 0, 1, 0, 2, 0, 1, 0, 3, /* 180 ~ 199 */
+	0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, /* 200 ~ 219 */
+	0, 1, 0, 5, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, /* 220 ~ 239 */
+	0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0                 /* 240 ~ 254 */
+};
+
+static u8 used_bit[] = {
+	0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4, 1, 2, 2, 3, /*   0 ~  19 */
+	2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, 1, 2, 2, 3, 2, 3, 3, 4, /*  20 ~  39 */
+	2, 3, 3, 4, 3, 4, 4, 5, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, /*  40 ~  59 */
+	4, 5, 5, 6, 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, /*  60 ~  79 */
+	2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 2, 3, 3, 4, /*  80 ~  99 */
+	3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 3, 4, 4, 5, 4, 5, 5, 6, /* 100 ~ 119 */
+	4, 5, 5, 6, 5, 6, 6, 7, 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, /* 120 ~ 139 */
+	3, 4, 4, 5, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, /* 140 ~ 159 */
+	2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 3, 4, 4, 5, /* 160 ~ 179 */
+	4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, 2, 3, 3, 4, 3, 4, 4, 5, /* 180 ~ 199 */
+	3, 4, 4, 5, 4, 5, 5, 6, 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, /* 200 ~ 219 */
+	5, 6, 6, 7, 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, /* 220 ~ 239 */
+	4, 5, 5, 6, 5, 6, 6, 7, 5, 6, 6, 7, 6, 7, 7, 8              /* 240 ~ 255 */
+};
+
+#define BITMAP_LOC(v)           ((v) >> 3)
+#define BITMAP_SHIFT(v)         ((v) & 0x07)
+
+static inline s32 exfat_bitmap_test(u8 *bitmap, int i)
+{
+	u8 data;
+
+	data = bitmap[BITMAP_LOC(i)];
+	if ((data >> BITMAP_SHIFT(i)) & 0x01)
+		return 1;
+	return 0;
+}
+
+static inline void exfat_bitmap_set(u8 *bitmap, int i)
+{
+	bitmap[BITMAP_LOC(i)] |= (0x01 << BITMAP_SHIFT(i));
+}
+
+static inline void exfat_bitmap_clear(u8 *bitmap, int i)
+{
+	bitmap[BITMAP_LOC(i)] &= ~(0x01 << BITMAP_SHIFT(i));
+}
+
+/*
+ *  File System Management Functions
+ */
+
+void fs_set_vol_flags(struct super_block *sb, u32 new_flag)
+{
+	struct pbr_sector_t *p_pbr;
+	struct bpbex_t *p_bpb;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+
+	if (p_fs->vol_flag == new_flag)
+		return;
+
+	p_fs->vol_flag = new_flag;
+
+	if (p_fs->vol_type == EXFAT) {
+		if (p_fs->pbr_bh == NULL) {
+			if (sector_read(sb, p_fs->PBR_sector,
+					&p_fs->pbr_bh, 1) != FFS_SUCCESS)
+				return;
+		}
+
+		p_pbr = (struct pbr_sector_t *)p_fs->pbr_bh->b_data;
+		p_bpb = (struct bpbex_t *)p_pbr->bpb;
+		SET16(p_bpb->vol_flags, (u16)new_flag);
+
+		/* XXX duyoung
+		 * what can we do here? (cuz fs_set_vol_flags() is void)
+		 */
+		if ((new_flag == VOL_DIRTY) && (!buffer_dirty(p_fs->pbr_bh)))
+			sector_write(sb, p_fs->PBR_sector, p_fs->pbr_bh, 1);
+		else
+			sector_write(sb, p_fs->PBR_sector, p_fs->pbr_bh, 0);
+	}
+}
+
+void fs_error(struct super_block *sb)
+{
+	struct exfat_mount_options *opts = &EXFAT_SB(sb)->options;
+
+	if (opts->errors == EXFAT_ERRORS_PANIC) {
+		panic("[EXFAT] Filesystem panic from previous error\n");
+	} else if ((opts->errors == EXFAT_ERRORS_RO) && !sb_rdonly(sb)) {
+		sb->s_flags |= SB_RDONLY;
+		pr_err("[EXFAT] Filesystem has been set read-only\n");
+	}
+}
+
+/*
+ *  Cluster Management Functions
+ */
+
+s32 clear_cluster(struct super_block *sb, u32 clu)
+{
+	sector_t s, n;
+	s32 ret = FFS_SUCCESS;
+	struct buffer_head *tmp_bh = NULL;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+	struct bd_info_t *p_bd = &(EXFAT_SB(sb)->bd_info);
+
+	if (clu == CLUSTER_32(0)) { /* FAT16 root_dir */
+		s = p_fs->root_start_sector;
+		n = p_fs->data_start_sector;
+	} else {
+		s = START_SECTOR(clu);
+		n = s + p_fs->sectors_per_clu;
+	}
+
+	for (; s < n; s++) {
+		ret = sector_read(sb, s, &tmp_bh, 0);
+		if (ret != FFS_SUCCESS)
+			return ret;
+
+		memset((char *)tmp_bh->b_data, 0x0, p_bd->sector_size);
+		ret = sector_write(sb, s, tmp_bh, 0);
+		if (ret != FFS_SUCCESS)
+			break;
+	}
+
+	brelse(tmp_bh);
+	return ret;
+}
+
+s32 fat_alloc_cluster(struct super_block *sb, s32 num_alloc,
+		      struct chain_t *p_chain)
+{
+	int i, num_clusters = 0;
+	u32 new_clu, last_clu = CLUSTER_32(~0), read_clu;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+
+	new_clu = p_chain->dir;
+	if (new_clu == CLUSTER_32(~0))
+		new_clu = p_fs->clu_srch_ptr;
+	else if (new_clu >= p_fs->num_clusters)
+		new_clu = 2;
+
+	__set_sb_dirty(sb);
+
+	p_chain->dir = CLUSTER_32(~0);
+
+	for (i = 2; i < p_fs->num_clusters; i++) {
+		if (FAT_read(sb, new_clu, &read_clu) != 0)
+			return -1;
+
+		if (read_clu == CLUSTER_32(0)) {
+			if (FAT_write(sb, new_clu, CLUSTER_32(~0)) < 0)
+				return -1;
+			num_clusters++;
+
+			if (p_chain->dir == CLUSTER_32(~0)) {
+				p_chain->dir = new_clu;
+			} else {
+				if (FAT_write(sb, last_clu, new_clu) < 0)
+					return -1;
+			}
+
+			last_clu = new_clu;
+
+			if ((--num_alloc) == 0) {
+				p_fs->clu_srch_ptr = new_clu;
+				if (p_fs->used_clusters != (u32) ~0)
+					p_fs->used_clusters += num_clusters;
+
+				return num_clusters;
+			}
+		}
+		if ((++new_clu) >= p_fs->num_clusters)
+			new_clu = 2;
+	}
+
+	p_fs->clu_srch_ptr = new_clu;
+	if (p_fs->used_clusters != (u32) ~0)
+		p_fs->used_clusters += num_clusters;
+
+	return num_clusters;
+}
+
+s32 exfat_alloc_cluster(struct super_block *sb, s32 num_alloc,
+			struct chain_t *p_chain)
+{
+	s32 num_clusters = 0;
+	u32 hint_clu, new_clu, last_clu = CLUSTER_32(~0);
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+
+	hint_clu = p_chain->dir;
+	if (hint_clu == CLUSTER_32(~0)) {
+		hint_clu = test_alloc_bitmap(sb, p_fs->clu_srch_ptr-2);
+		if (hint_clu == CLUSTER_32(~0))
+			return 0;
+	} else if (hint_clu >= p_fs->num_clusters) {
+		hint_clu = 2;
+		p_chain->flags = 0x01;
+	}
+
+	__set_sb_dirty(sb);
+
+	p_chain->dir = CLUSTER_32(~0);
+
+	while ((new_clu = test_alloc_bitmap(sb, hint_clu-2)) != CLUSTER_32(~0)) {
+		if (new_clu != hint_clu) {
+			if (p_chain->flags == 0x03) {
+				exfat_chain_cont_cluster(sb, p_chain->dir,
+							 num_clusters);
+				p_chain->flags = 0x01;
+			}
+		}
+
+		if (set_alloc_bitmap(sb, new_clu-2) != FFS_SUCCESS)
+			return -1;
+
+		num_clusters++;
+
+		if (p_chain->flags == 0x01) {
+			if (FAT_write(sb, new_clu, CLUSTER_32(~0)) < 0)
+				return -1;
+		}
+
+		if (p_chain->dir == CLUSTER_32(~0)) {
+			p_chain->dir = new_clu;
+		} else {
+			if (p_chain->flags == 0x01) {
+				if (FAT_write(sb, last_clu, new_clu) < 0)
+					return -1;
+			}
+		}
+		last_clu = new_clu;
+
+		if ((--num_alloc) == 0) {
+			p_fs->clu_srch_ptr = hint_clu;
+			if (p_fs->used_clusters != (u32) ~0)
+				p_fs->used_clusters += num_clusters;
+
+			p_chain->size += num_clusters;
+			return num_clusters;
+		}
+
+		hint_clu = new_clu + 1;
+		if (hint_clu >= p_fs->num_clusters) {
+			hint_clu = 2;
+
+			if (p_chain->flags == 0x03) {
+				exfat_chain_cont_cluster(sb, p_chain->dir,
+							 num_clusters);
+				p_chain->flags = 0x01;
+			}
+		}
+	}
+
+	p_fs->clu_srch_ptr = hint_clu;
+	if (p_fs->used_clusters != (u32) ~0)
+		p_fs->used_clusters += num_clusters;
+
+	p_chain->size += num_clusters;
+	return num_clusters;
+}
+
+void fat_free_cluster(struct super_block *sb, struct chain_t *p_chain,
+		      s32 do_relse)
+{
+	s32 num_clusters = 0;
+	u32 clu, prev;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+	int i;
+	sector_t sector;
+
+	if ((p_chain->dir == CLUSTER_32(0)) || (p_chain->dir == CLUSTER_32(~0)))
+		return;
+	__set_sb_dirty(sb);
+	clu = p_chain->dir;
+
+	if (p_chain->size <= 0)
+		return;
+
+	do {
+		if (p_fs->dev_ejected)
+			break;
+
+		if (do_relse) {
+			sector = START_SECTOR(clu);
+			for (i = 0; i < p_fs->sectors_per_clu; i++)
+				buf_release(sb, sector+i);
+		}
+
+		prev = clu;
+		if (FAT_read(sb, clu, &clu) == -1)
+			break;
+
+		if (FAT_write(sb, prev, CLUSTER_32(0)) < 0)
+			break;
+		num_clusters++;
+
+	} while (clu != CLUSTER_32(~0));
+
+	if (p_fs->used_clusters != (u32) ~0)
+		p_fs->used_clusters -= num_clusters;
+}
+
+void exfat_free_cluster(struct super_block *sb, struct chain_t *p_chain,
+			s32 do_relse)
+{
+	s32 num_clusters = 0;
+	u32 clu;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+	int i;
+	sector_t sector;
+
+	if ((p_chain->dir == CLUSTER_32(0)) || (p_chain->dir == CLUSTER_32(~0)))
+		return;
+
+	if (p_chain->size <= 0) {
+		pr_err("[EXFAT] free_cluster : skip free-req clu:%u, because of zero-size truncation\n",
+		       p_chain->dir);
+		return;
+	}
+
+	__set_sb_dirty(sb);
+	clu = p_chain->dir;
+
+	if (p_chain->flags == 0x03) {
+		do {
+			if (do_relse) {
+				sector = START_SECTOR(clu);
+				for (i = 0; i < p_fs->sectors_per_clu; i++)
+					buf_release(sb, sector+i);
+			}
+
+			if (clr_alloc_bitmap(sb, clu-2) != FFS_SUCCESS)
+				break;
+			clu++;
+
+			num_clusters++;
+		} while (num_clusters < p_chain->size);
+	} else {
+		do {
+			if (p_fs->dev_ejected)
+				break;
+
+			if (do_relse) {
+				sector = START_SECTOR(clu);
+				for (i = 0; i < p_fs->sectors_per_clu; i++)
+					buf_release(sb, sector+i);
+			}
+
+			if (clr_alloc_bitmap(sb, clu-2) != FFS_SUCCESS)
+				break;
+
+			if (FAT_read(sb, clu, &clu) == -1)
+				break;
+			num_clusters++;
+		} while ((clu != CLUSTER_32(0)) && (clu != CLUSTER_32(~0)));
+	}
+
+	if (p_fs->used_clusters != (u32) ~0)
+		p_fs->used_clusters -= num_clusters;
+}
+
+u32 find_last_cluster(struct super_block *sb, struct chain_t *p_chain)
+{
+	u32 clu, next;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+
+	clu = p_chain->dir;
+
+	if (p_chain->flags == 0x03) {
+		clu += p_chain->size - 1;
+	} else {
+		while ((FAT_read(sb, clu, &next) == 0) &&
+		       (next != CLUSTER_32(~0))) {
+			if (p_fs->dev_ejected)
+				break;
+			clu = next;
+		}
+	}
+
+	return clu;
+}
+
+s32 count_num_clusters(struct super_block *sb, struct chain_t *p_chain)
+{
+	int i, count = 0;
+	u32 clu;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+
+	if ((p_chain->dir == CLUSTER_32(0)) || (p_chain->dir == CLUSTER_32(~0)))
+		return 0;
+
+	clu = p_chain->dir;
+
+	if (p_chain->flags == 0x03) {
+		count = p_chain->size;
+	} else {
+		for (i = 2; i < p_fs->num_clusters; i++) {
+			count++;
+			if (FAT_read(sb, clu, &clu) != 0)
+				return 0;
+			if (clu == CLUSTER_32(~0))
+				break;
+		}
+	}
+
+	return count;
+}
+
+s32 fat_count_used_clusters(struct super_block *sb)
+{
+	int i, count = 0;
+	u32 clu;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+
+	for (i = 2; i < p_fs->num_clusters; i++) {
+		if (FAT_read(sb, i, &clu) != 0)
+			break;
+		if (clu != CLUSTER_32(0))
+			count++;
+	}
+
+	return count;
+}
+
+s32 exfat_count_used_clusters(struct super_block *sb)
+{
+	int i, map_i, map_b, count = 0;
+	u8 k;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+	struct bd_info_t *p_bd = &(EXFAT_SB(sb)->bd_info);
+
+	map_i = map_b = 0;
+
+	for (i = 2; i < p_fs->num_clusters; i += 8) {
+		k = *(((u8 *) p_fs->vol_amap[map_i]->b_data) + map_b);
+		count += used_bit[k];
+
+		if ((++map_b) >= p_bd->sector_size) {
+			map_i++;
+			map_b = 0;
+		}
+	}
+
+	return count;
+}
+
+void exfat_chain_cont_cluster(struct super_block *sb, u32 chain, s32 len)
+{
+	if (len == 0)
+		return;
+
+	while (len > 1) {
+		if (FAT_write(sb, chain, chain+1) < 0)
+			break;
+		chain++;
+		len--;
+	}
+	FAT_write(sb, chain, CLUSTER_32(~0));
+}
+
+/*
+ *  Allocation Bitmap Management Functions
+ */
+
+s32 load_alloc_bitmap(struct super_block *sb)
+{
+	int i, j, ret;
+	u32 map_size;
+	u32 type;
+	sector_t sector;
+	struct chain_t clu;
+	struct bmap_dentry_t *ep;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+	struct bd_info_t *p_bd = &(EXFAT_SB(sb)->bd_info);
+
+	clu.dir = p_fs->root_dir;
+	clu.flags = 0x01;
+
+	while (clu.dir != CLUSTER_32(~0)) {
+		if (p_fs->dev_ejected)
+			break;
+
+		for (i = 0; i < p_fs->dentries_per_clu; i++) {
+			ep = (struct bmap_dentry_t *)get_entry_in_dir(sb, &clu,
+								      i, NULL);
+			if (!ep)
+				return FFS_MEDIAERR;
+
+			type = p_fs->fs_func->get_entry_type((struct dentry_t *)ep);
+
+			if (type == TYPE_UNUSED)
+				break;
+			if (type != TYPE_BITMAP)
+				continue;
+
+			if (ep->flags == 0x0) {
+				p_fs->map_clu  = GET32_A(ep->start_clu);
+				map_size = (u32) GET64_A(ep->size);
+
+				p_fs->map_sectors = ((map_size-1) >> p_bd->sector_size_bits) + 1;
+
+				p_fs->vol_amap = kmalloc_array(p_fs->map_sectors,
+							       sizeof(struct buffer_head *),
+							       GFP_KERNEL);
+				if (p_fs->vol_amap == NULL)
+					return FFS_MEMORYERR;
+
+				sector = START_SECTOR(p_fs->map_clu);
+
+				for (j = 0; j < p_fs->map_sectors; j++) {
+					p_fs->vol_amap[j] = NULL;
+					ret = sector_read(sb, sector+j, &(p_fs->vol_amap[j]), 1);
+					if (ret != FFS_SUCCESS) {
+						/*  release all buffers and free vol_amap */
+						i = 0;
+						while (i < j)
+							brelse(p_fs->vol_amap[i++]);
+
+						kfree(p_fs->vol_amap);
+						p_fs->vol_amap = NULL;
+						return ret;
+					}
+				}
+
+				p_fs->pbr_bh = NULL;
+				return FFS_SUCCESS;
+			}
+		}
+
+		if (FAT_read(sb, clu.dir, &clu.dir) != 0)
+			return FFS_MEDIAERR;
+	}
+
+	return FFS_FORMATERR;
+}
+
+void free_alloc_bitmap(struct super_block *sb)
+{
+	int i;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+
+	brelse(p_fs->pbr_bh);
+
+	for (i = 0; i < p_fs->map_sectors; i++)
+		__brelse(p_fs->vol_amap[i]);
+
+	kfree(p_fs->vol_amap);
+	p_fs->vol_amap = NULL;
+}
+
+s32 set_alloc_bitmap(struct super_block *sb, u32 clu)
+{
+	int i, b;
+	sector_t sector;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+	struct bd_info_t *p_bd = &(EXFAT_SB(sb)->bd_info);
+
+	i = clu >> (p_bd->sector_size_bits + 3);
+	b = clu & ((p_bd->sector_size << 3) - 1);
+
+	sector = START_SECTOR(p_fs->map_clu) + i;
+
+	exfat_bitmap_set((u8 *) p_fs->vol_amap[i]->b_data, b);
+
+	return sector_write(sb, sector, p_fs->vol_amap[i], 0);
+}
+
+s32 clr_alloc_bitmap(struct super_block *sb, u32 clu)
+{
+	int i, b;
+	sector_t sector;
+#ifdef CONFIG_EXFAT_DISCARD
+	struct exfat_sb_info *sbi = EXFAT_SB(sb);
+	struct exfat_mount_options *opts = &sbi->options;
+	int ret;
+#endif /* CONFIG_EXFAT_DISCARD */
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+	struct bd_info_t *p_bd = &(EXFAT_SB(sb)->bd_info);
+
+	i = clu >> (p_bd->sector_size_bits + 3);
+	b = clu & ((p_bd->sector_size << 3) - 1);
+
+	sector = START_SECTOR(p_fs->map_clu) + i;
+
+	exfat_bitmap_clear((u8 *) p_fs->vol_amap[i]->b_data, b);
+
+	return sector_write(sb, sector, p_fs->vol_amap[i], 0);
+
+#ifdef CONFIG_EXFAT_DISCARD
+	if (opts->discard) {
+		ret = sb_issue_discard(sb, START_SECTOR(clu),
+				       (1 << p_fs->sectors_per_clu_bits),
+				       GFP_NOFS, 0);
+		if (ret == -EOPNOTSUPP) {
+			pr_warn("discard not supported by device, disabling");
+			opts->discard = 0;
+		}
+	}
+#endif /* CONFIG_EXFAT_DISCARD */
+}
+
+u32 test_alloc_bitmap(struct super_block *sb, u32 clu)
+{
+	int i, map_i, map_b;
+	u32 clu_base, clu_free;
+	u8 k, clu_mask;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+	struct bd_info_t *p_bd = &(EXFAT_SB(sb)->bd_info);
+
+	clu_base = (clu & ~(0x7)) + 2;
+	clu_mask = (1 << (clu - clu_base + 2)) - 1;
+
+	map_i = clu >> (p_bd->sector_size_bits + 3);
+	map_b = (clu >> 3) & p_bd->sector_size_mask;
+
+	for (i = 2; i < p_fs->num_clusters; i += 8) {
+		k = *(((u8 *) p_fs->vol_amap[map_i]->b_data) + map_b);
+		if (clu_mask > 0) {
+			k |= clu_mask;
+			clu_mask = 0;
+		}
+		if (k < 0xFF) {
+			clu_free = clu_base + free_bit[k];
+			if (clu_free < p_fs->num_clusters)
+				return clu_free;
+		}
+		clu_base += 8;
+
+		if (((++map_b) >= p_bd->sector_size) ||
+		    (clu_base >= p_fs->num_clusters)) {
+			if ((++map_i) >= p_fs->map_sectors) {
+				clu_base = 2;
+				map_i = 0;
+			}
+			map_b = 0;
+		}
+	}
+
+	return CLUSTER_32(~0);
+}
+
+void sync_alloc_bitmap(struct super_block *sb)
+{
+	int i;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+
+	if (p_fs->vol_amap == NULL)
+		return;
+
+	for (i = 0; i < p_fs->map_sectors; i++)
+		sync_dirty_buffer(p_fs->vol_amap[i]);
+}
+
+/*
+ *  Upcase table Management Functions
+ */
+static s32 __load_upcase_table(struct super_block *sb, sector_t sector,
+			       u32 num_sectors, u32 utbl_checksum)
+{
+	int i, ret = FFS_ERROR;
+	u32 j;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+	struct bd_info_t *p_bd = &(EXFAT_SB(sb)->bd_info);
+	struct buffer_head *tmp_bh = NULL;
+	sector_t end_sector = num_sectors + sector;
+
+	u8	skip = FALSE;
+	u32	index = 0;
+	u16	uni = 0;
+	u16 **upcase_table;
+
+	u32 checksum = 0;
+
+	upcase_table = p_fs->vol_utbl = kmalloc(UTBL_COL_COUNT * sizeof(u16 *),
+						GFP_KERNEL);
+	if (upcase_table == NULL)
+		return FFS_MEMORYERR;
+	memset(upcase_table, 0, UTBL_COL_COUNT * sizeof(u16 *));
+
+	while (sector < end_sector) {
+		ret = sector_read(sb, sector, &tmp_bh, 1);
+		if (ret != FFS_SUCCESS) {
+			pr_debug("sector read (0x%llX)fail\n",
+				 (unsigned long long)sector);
+			goto error;
+		}
+		sector++;
+
+		for (i = 0; i < p_bd->sector_size && index <= 0xFFFF; i += 2) {
+			uni = GET16(((u8 *) tmp_bh->b_data)+i);
+
+			checksum = ((checksum & 1) ? 0x80000000 : 0) +
+				   (checksum >> 1) + *(((u8 *)tmp_bh->b_data) +
+						       i);
+			checksum = ((checksum & 1) ? 0x80000000 : 0) +
+				   (checksum >> 1) + *(((u8 *)tmp_bh->b_data) +
+						       (i + 1));
+
+			if (skip) {
+				pr_debug("skip from 0x%X ", index);
+				index += uni;
+				pr_debug("to 0x%X (amount of 0x%X)\n",
+					 index, uni);
+				skip = FALSE;
+			} else if (uni == index)
+				index++;
+			else if (uni == 0xFFFF)
+				skip = TRUE;
+			else { /* uni != index , uni != 0xFFFF */
+				u16 col_index = get_col_index(index);
+
+				if (upcase_table[col_index] == NULL) {
+					pr_debug("alloc = 0x%X\n", col_index);
+					upcase_table[col_index] = kmalloc_array(UTBL_ROW_COUNT,
+						sizeof(u16), GFP_KERNEL);
+					if (upcase_table[col_index] == NULL) {
+						ret = FFS_MEMORYERR;
+						goto error;
+					}
+
+					for (j = 0; j < UTBL_ROW_COUNT; j++)
+						upcase_table[col_index][j] = (col_index << LOW_INDEX_BIT) | j;
+				}
+
+				upcase_table[col_index][get_row_index(index)] = uni;
+				index++;
+			}
+		}
+	}
+	if (index >= 0xFFFF && utbl_checksum == checksum) {
+		if (tmp_bh)
+			brelse(tmp_bh);
+		return FFS_SUCCESS;
+	}
+	ret = FFS_ERROR;
+error:
+	if (tmp_bh)
+		brelse(tmp_bh);
+	free_upcase_table(sb);
+	return ret;
+}
+
+static s32 __load_default_upcase_table(struct super_block *sb)
+{
+	int i, ret = FFS_ERROR;
+	u32 j;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+
+	u8	skip = FALSE;
+	u32	index = 0;
+	u16	uni = 0;
+	u16 **upcase_table;
+
+	upcase_table = p_fs->vol_utbl = kmalloc(UTBL_COL_COUNT * sizeof(u16 *),
+						GFP_KERNEL);
+	if (upcase_table == NULL)
+		return FFS_MEMORYERR;
+	memset(upcase_table, 0, UTBL_COL_COUNT * sizeof(u16 *));
+
+	for (i = 0; index <= 0xFFFF && i < NUM_UPCASE*2; i += 2) {
+		uni = GET16(uni_upcase + i);
+		if (skip) {
+			pr_debug("skip from 0x%X ", index);
+			index += uni;
+			pr_debug("to 0x%X (amount of 0x%X)\n", index, uni);
+			skip = FALSE;
+		} else if (uni == index)
+			index++;
+		else if (uni == 0xFFFF)
+			skip = TRUE;
+		else { /* uni != index , uni != 0xFFFF */
+			u16 col_index = get_col_index(index);
+
+			if (upcase_table[col_index] == NULL) {
+				pr_debug("alloc = 0x%X\n", col_index);
+				upcase_table[col_index] = kmalloc_array(UTBL_ROW_COUNT,
+									sizeof(u16),
+									GFP_KERNEL);
+				if (upcase_table[col_index] == NULL) {
+					ret = FFS_MEMORYERR;
+					goto error;
+				}
+
+				for (j = 0; j < UTBL_ROW_COUNT; j++)
+					upcase_table[col_index][j] = (col_index << LOW_INDEX_BIT) | j;
+			}
+
+			upcase_table[col_index][get_row_index(index)] = uni;
+			index++;
+		}
+	}
+
+	if (index >= 0xFFFF)
+		return FFS_SUCCESS;
+
+error:
+	/* FATAL error: default upcase table has error */
+	free_upcase_table(sb);
+	return ret;
+}
+
+s32 load_upcase_table(struct super_block *sb)
+{
+	int i;
+	u32 tbl_clu, tbl_size;
+	sector_t sector;
+	u32 type, num_sectors;
+	struct chain_t clu;
+	struct case_dentry_t *ep;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+	struct bd_info_t *p_bd = &(EXFAT_SB(sb)->bd_info);
+
+	clu.dir = p_fs->root_dir;
+	clu.flags = 0x01;
+
+	if (p_fs->dev_ejected)
+		return FFS_MEDIAERR;
+
+	while (clu.dir != CLUSTER_32(~0)) {
+		for (i = 0; i < p_fs->dentries_per_clu; i++) {
+			ep = (struct case_dentry_t *)get_entry_in_dir(sb, &clu,
+								      i, NULL);
+			if (!ep)
+				return FFS_MEDIAERR;
+
+			type = p_fs->fs_func->get_entry_type((struct dentry_t *)ep);
+
+			if (type == TYPE_UNUSED)
+				break;
+			if (type != TYPE_UPCASE)
+				continue;
+
+			tbl_clu  = GET32_A(ep->start_clu);
+			tbl_size = (u32) GET64_A(ep->size);
+
+			sector = START_SECTOR(tbl_clu);
+			num_sectors = ((tbl_size-1) >> p_bd->sector_size_bits) + 1;
+			if (__load_upcase_table(sb, sector, num_sectors,
+						GET32_A(ep->checksum)) != FFS_SUCCESS)
+				break;
+			return FFS_SUCCESS;
+		}
+		if (FAT_read(sb, clu.dir, &clu.dir) != 0)
+			return FFS_MEDIAERR;
+	}
+	/* load default upcase table */
+	return __load_default_upcase_table(sb);
+}
+
+void free_upcase_table(struct super_block *sb)
+{
+	u32 i;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+	u16 **upcase_table;
+
+	upcase_table = p_fs->vol_utbl;
+	for (i = 0; i < UTBL_COL_COUNT; i++)
+		kfree(upcase_table[i]);
+
+	kfree(p_fs->vol_utbl);
+	p_fs->vol_utbl = NULL;
+}
+
+/*
+ *  Directory Entry Management Functions
+ */
+
+u32 fat_get_entry_type(struct dentry_t *p_entry)
+{
+	struct dos_dentry_t *ep = (struct dos_dentry_t *) p_entry;
+
+	if (*(ep->name) == 0x0)
+		return TYPE_UNUSED;
+
+	else if (*(ep->name) == 0xE5)
+		return TYPE_DELETED;
+
+	else if (ep->attr == ATTR_EXTEND)
+		return TYPE_EXTEND;
+
+	else if ((ep->attr & (ATTR_SUBDIR|ATTR_VOLUME)) == ATTR_VOLUME)
+		return TYPE_VOLUME;
+
+	else if ((ep->attr & (ATTR_SUBDIR|ATTR_VOLUME)) == ATTR_SUBDIR)
+		return TYPE_DIR;
+
+	return TYPE_FILE;
+}
+
+u32 exfat_get_entry_type(struct dentry_t *p_entry)
+{
+	struct file_dentry_t *ep = (struct file_dentry_t *) p_entry;
+
+	if (ep->type == 0x0) {
+		return TYPE_UNUSED;
+	} else if (ep->type < 0x80) {
+		return TYPE_DELETED;
+	} else if (ep->type == 0x80) {
+		return TYPE_INVALID;
+	} else if (ep->type < 0xA0) {
+		if (ep->type == 0x81) {
+			return TYPE_BITMAP;
+		} else if (ep->type == 0x82) {
+			return TYPE_UPCASE;
+		} else if (ep->type == 0x83) {
+			return TYPE_VOLUME;
+		} else if (ep->type == 0x85) {
+			if (GET16_A(ep->attr) & ATTR_SUBDIR)
+				return TYPE_DIR;
+			else
+				return TYPE_FILE;
+		}
+		return TYPE_CRITICAL_PRI;
+	} else if (ep->type < 0xC0) {
+		if (ep->type == 0xA0)
+			return TYPE_GUID;
+		else if (ep->type == 0xA1)
+			return TYPE_PADDING;
+		else if (ep->type == 0xA2)
+			return TYPE_ACLTAB;
+		return TYPE_BENIGN_PRI;
+	} else if (ep->type < 0xE0) {
+		if (ep->type == 0xC0)
+			return TYPE_STREAM;
+		else if (ep->type == 0xC1)
+			return TYPE_EXTEND;
+		else if (ep->type == 0xC2)
+			return TYPE_ACL;
+		return TYPE_CRITICAL_SEC;
+	}
+
+	return TYPE_BENIGN_SEC;
+}
+
+void fat_set_entry_type(struct dentry_t *p_entry, u32 type)
+{
+	struct dos_dentry_t *ep = (struct dos_dentry_t *) p_entry;
+
+	if (type == TYPE_UNUSED)
+		*(ep->name) = 0x0;
+
+	else if (type == TYPE_DELETED)
+		*(ep->name) = 0xE5;
+
+	else if (type == TYPE_EXTEND)
+		ep->attr = ATTR_EXTEND;
+
+	else if (type == TYPE_DIR)
+		ep->attr = ATTR_SUBDIR;
+
+	else if (type == TYPE_FILE)
+		ep->attr = ATTR_ARCHIVE;
+
+	else if (type == TYPE_SYMLINK)
+		ep->attr = ATTR_ARCHIVE | ATTR_SYMLINK;
+}
+
+void exfat_set_entry_type(struct dentry_t *p_entry, u32 type)
+{
+	struct file_dentry_t *ep = (struct file_dentry_t *) p_entry;
+
+	if (type == TYPE_UNUSED) {
+		ep->type = 0x0;
+	} else if (type == TYPE_DELETED) {
+		ep->type &= ~0x80;
+	} else if (type == TYPE_STREAM) {
+		ep->type = 0xC0;
+	} else if (type == TYPE_EXTEND) {
+		ep->type = 0xC1;
+	} else if (type == TYPE_BITMAP) {
+		ep->type = 0x81;
+	} else if (type == TYPE_UPCASE) {
+		ep->type = 0x82;
+	} else if (type == TYPE_VOLUME) {
+		ep->type = 0x83;
+	} else if (type == TYPE_DIR) {
+		ep->type = 0x85;
+		SET16_A(ep->attr, ATTR_SUBDIR);
+	} else if (type == TYPE_FILE) {
+		ep->type = 0x85;
+		SET16_A(ep->attr, ATTR_ARCHIVE);
+	} else if (type == TYPE_SYMLINK) {
+		ep->type = 0x85;
+		SET16_A(ep->attr, ATTR_ARCHIVE | ATTR_SYMLINK);
+	}
+}
+
+u32 fat_get_entry_attr(struct dentry_t *p_entry)
+{
+	struct dos_dentry_t *ep = (struct dos_dentry_t *) p_entry;
+
+	return (u32) ep->attr;
+}
+
+u32 exfat_get_entry_attr(struct dentry_t *p_entry)
+{
+	struct file_dentry_t *ep = (struct file_dentry_t *) p_entry;
+
+	return (u32) GET16_A(ep->attr);
+}
+
+void fat_set_entry_attr(struct dentry_t *p_entry, u32 attr)
+{
+	struct dos_dentry_t *ep = (struct dos_dentry_t *) p_entry;
+
+	ep->attr = (u8) attr;
+}
+
+void exfat_set_entry_attr(struct dentry_t *p_entry, u32 attr)
+{
+	struct file_dentry_t *ep = (struct file_dentry_t *) p_entry;
+
+	SET16_A(ep->attr, (u16) attr);
+}
+
+u8 fat_get_entry_flag(struct dentry_t *p_entry)
+{
+	return 0x01;
+}
+
+u8 exfat_get_entry_flag(struct dentry_t *p_entry)
+{
+	struct strm_dentry_t *ep = (struct strm_dentry_t *) p_entry;
+
+	return ep->flags;
+}
+
+void fat_set_entry_flag(struct dentry_t *p_entry, u8 flags)
+{
+}
+
+void exfat_set_entry_flag(struct dentry_t *p_entry, u8 flags)
+{
+	struct strm_dentry_t *ep = (struct strm_dentry_t *) p_entry;
+
+	ep->flags = flags;
+}
+
+u32 fat_get_entry_clu0(struct dentry_t *p_entry)
+{
+	struct dos_dentry_t *ep = (struct dos_dentry_t *) p_entry;
+
+	return ((u32)GET16_A(ep->start_clu_hi) << 16) |
+		GET16_A(ep->start_clu_lo);
+}
+
+u32 exfat_get_entry_clu0(struct dentry_t *p_entry)
+{
+	struct strm_dentry_t *ep = (struct strm_dentry_t *) p_entry;
+
+	return GET32_A(ep->start_clu);
+}
+
+void fat_set_entry_clu0(struct dentry_t *p_entry, u32 start_clu)
+{
+	struct dos_dentry_t *ep = (struct dos_dentry_t *)p_entry;
+
+	SET16_A(ep->start_clu_lo, CLUSTER_16(start_clu));
+	SET16_A(ep->start_clu_hi, CLUSTER_16(start_clu >> 16));
+}
+
+void exfat_set_entry_clu0(struct dentry_t *p_entry, u32 start_clu)
+{
+	struct strm_dentry_t *ep = (struct strm_dentry_t *)p_entry;
+
+	SET32_A(ep->start_clu, start_clu);
+}
+
+u64 fat_get_entry_size(struct dentry_t *p_entry)
+{
+	struct dos_dentry_t *ep = (struct dos_dentry_t *)p_entry;
+
+	return (u64) GET32_A(ep->size);
+}
+
+u64 exfat_get_entry_size(struct dentry_t *p_entry)
+{
+	struct strm_dentry_t *ep = (struct strm_dentry_t *)p_entry;
+
+	return GET64_A(ep->valid_size);
+}
+
+void fat_set_entry_size(struct dentry_t *p_entry, u64 size)
+{
+	struct dos_dentry_t *ep = (struct dos_dentry_t *)p_entry;
+
+	SET32_A(ep->size, (u32) size);
+}
+
+void exfat_set_entry_size(struct dentry_t *p_entry, u64 size)
+{
+	struct strm_dentry_t *ep = (struct strm_dentry_t *)p_entry;
+
+	SET64_A(ep->valid_size, size);
+	SET64_A(ep->size, size);
+}
+
+void fat_get_entry_time(struct dentry_t *p_entry, struct timestamp_t *tp,
+			u8 mode)
+{
+	u16 t = 0x00, d = 0x21;
+	struct dos_dentry_t *ep = (struct dos_dentry_t *)p_entry;
+
+	switch (mode) {
+	case TM_CREATE:
+		t = GET16_A(ep->create_time);
+		d = GET16_A(ep->create_date);
+		break;
+	case TM_MODIFY:
+		t = GET16_A(ep->modify_time);
+		d = GET16_A(ep->modify_date);
+		break;
+	}
+
+	tp->sec  = (t & 0x001F) << 1;
+	tp->min  = (t >> 5) & 0x003F;
+	tp->hour = (t >> 11);
+	tp->day  = (d & 0x001F);
+	tp->mon  = (d >> 5) & 0x000F;
+	tp->year = (d >> 9);
+}
+
+void exfat_get_entry_time(struct dentry_t *p_entry, struct timestamp_t *tp,
+			  u8 mode)
+{
+	u16 t = 0x00, d = 0x21;
+	struct file_dentry_t *ep = (struct file_dentry_t *)p_entry;
+
+	switch (mode) {
+	case TM_CREATE:
+		t = GET16_A(ep->create_time);
+		d = GET16_A(ep->create_date);
+		break;
+	case TM_MODIFY:
+		t = GET16_A(ep->modify_time);
+		d = GET16_A(ep->modify_date);
+		break;
+	case TM_ACCESS:
+		t = GET16_A(ep->access_time);
+		d = GET16_A(ep->access_date);
+		break;
+	}
+
+	tp->sec  = (t & 0x001F) << 1;
+	tp->min  = (t >> 5) & 0x003F;
+	tp->hour = (t >> 11);
+	tp->day  = (d & 0x001F);
+	tp->mon  = (d >> 5) & 0x000F;
+	tp->year = (d >> 9);
+}
+
+void fat_set_entry_time(struct dentry_t *p_entry, struct timestamp_t *tp,
+			u8 mode)
+{
+	u16 t, d;
+	struct dos_dentry_t *ep = (struct dos_dentry_t *)p_entry;
+
+	t = (tp->hour << 11) | (tp->min << 5) | (tp->sec >> 1);
+	d = (tp->year <<  9) | (tp->mon << 5) |  tp->day;
+
+	switch (mode) {
+	case TM_CREATE:
+		SET16_A(ep->create_time, t);
+		SET16_A(ep->create_date, d);
+		break;
+	case TM_MODIFY:
+		SET16_A(ep->modify_time, t);
+		SET16_A(ep->modify_date, d);
+		break;
+	}
+}
+
+void exfat_set_entry_time(struct dentry_t *p_entry, struct timestamp_t *tp,
+			  u8 mode)
+{
+	u16 t, d;
+	struct file_dentry_t *ep = (struct file_dentry_t *)p_entry;
+
+	t = (tp->hour << 11) | (tp->min << 5) | (tp->sec >> 1);
+	d = (tp->year <<  9) | (tp->mon << 5) |  tp->day;
+
+	switch (mode) {
+	case TM_CREATE:
+		SET16_A(ep->create_time, t);
+		SET16_A(ep->create_date, d);
+		break;
+	case TM_MODIFY:
+		SET16_A(ep->modify_time, t);
+		SET16_A(ep->modify_date, d);
+		break;
+	case TM_ACCESS:
+		SET16_A(ep->access_time, t);
+		SET16_A(ep->access_date, d);
+		break;
+	}
+}
+
+s32 fat_init_dir_entry(struct super_block *sb, struct chain_t *p_dir, s32 entry,
+		       u32 type, u32 start_clu, u64 size)
+{
+	sector_t sector;
+	struct dos_dentry_t *dos_ep;
+
+	dos_ep = (struct dos_dentry_t *)get_entry_in_dir(sb, p_dir, entry,
+							 &sector);
+	if (!dos_ep)
+		return FFS_MEDIAERR;
+
+	init_dos_entry(dos_ep, type, start_clu);
+	buf_modify(sb, sector);
+
+	return FFS_SUCCESS;
+}
+
+s32 exfat_init_dir_entry(struct super_block *sb, struct chain_t *p_dir,
+			 s32 entry, u32 type, u32 start_clu, u64 size)
+{
+	sector_t sector;
+	u8 flags;
+	struct file_dentry_t *file_ep;
+	struct strm_dentry_t *strm_ep;
+
+	flags = (type == TYPE_FILE) ? 0x01 : 0x03;
+
+	/* we cannot use get_entry_set_in_dir here because file ep is not initialized yet */
+	file_ep = (struct file_dentry_t *)get_entry_in_dir(sb, p_dir, entry,
+							   &sector);
+	if (!file_ep)
+		return FFS_MEDIAERR;
+
+	strm_ep = (struct strm_dentry_t *)get_entry_in_dir(sb, p_dir, entry+1,
+							   &sector);
+	if (!strm_ep)
+		return FFS_MEDIAERR;
+
+	init_file_entry(file_ep, type);
+	buf_modify(sb, sector);
+
+	init_strm_entry(strm_ep, flags, start_clu, size);
+	buf_modify(sb, sector);
+
+	return FFS_SUCCESS;
+}
+
+static s32 fat_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)
+{
+	int i;
+	sector_t sector;
+	u8 chksum;
+	u16 *uniname = p_uniname->name;
+	struct dos_dentry_t *dos_ep;
+	struct ext_dentry_t *ext_ep;
+
+	dos_ep = (struct dos_dentry_t *)get_entry_in_dir(sb, p_dir, entry,
+							 &sector);
+	if (!dos_ep)
+		return FFS_MEDIAERR;
+
+	dos_ep->lcase = p_dosname->name_case;
+	memcpy(dos_ep->name, p_dosname->name, DOS_NAME_LENGTH);
+	buf_modify(sb, sector);
+
+	if ((--num_entries) > 0) {
+		chksum = calc_checksum_1byte((void *)dos_ep->name,
+					     DOS_NAME_LENGTH, 0);
+
+		for (i = 1; i < num_entries; i++) {
+			ext_ep = (struct ext_dentry_t *)get_entry_in_dir(sb,
+									 p_dir,
+									 entry - i,
+									 &sector);
+			if (!ext_ep)
+				return FFS_MEDIAERR;
+
+			init_ext_entry(ext_ep, i, chksum, uniname);
+			buf_modify(sb, sector);
+			uniname += 13;
+		}
+
+		ext_ep = (struct ext_dentry_t *)get_entry_in_dir(sb, p_dir,
+								 entry - i,
+								 &sector);
+		if (!ext_ep)
+			return FFS_MEDIAERR;
+
+		init_ext_entry(ext_ep, i+0x40, chksum, uniname);
+		buf_modify(sb, sector);
+	}
+
+	return FFS_SUCCESS;
+}
+
+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)
+{
+	int i;
+	sector_t sector;
+	u16 *uniname = p_uniname->name;
+	struct file_dentry_t *file_ep;
+	struct strm_dentry_t *strm_ep;
+	struct name_dentry_t *name_ep;
+
+	file_ep = (struct file_dentry_t *)get_entry_in_dir(sb, p_dir, entry,
+							   &sector);
+	if (!file_ep)
+		return FFS_MEDIAERR;
+
+	file_ep->num_ext = (u8)(num_entries - 1);
+	buf_modify(sb, sector);
+
+	strm_ep = (struct strm_dentry_t *)get_entry_in_dir(sb, p_dir, entry+1,
+							   &sector);
+	if (!strm_ep)
+		return FFS_MEDIAERR;
+
+	strm_ep->name_len = p_uniname->name_len;
+	SET16_A(strm_ep->name_hash, p_uniname->name_hash);
+	buf_modify(sb, sector);
+
+	for (i = 2; i < num_entries; i++) {
+		name_ep = (struct name_dentry_t *)get_entry_in_dir(sb, p_dir,
+								   entry + i,
+								   &sector);
+		if (!name_ep)
+			return FFS_MEDIAERR;
+
+		init_name_entry(name_ep, uniname);
+		buf_modify(sb, sector);
+		uniname += 15;
+	}
+
+	update_dir_checksum(sb, p_dir, entry);
+
+	return FFS_SUCCESS;
+}
+
+void init_dos_entry(struct dos_dentry_t *ep, u32 type, u32 start_clu)
+{
+	struct timestamp_t tm, *tp;
+
+	fat_set_entry_type((struct dentry_t *) ep, type);
+	SET16_A(ep->start_clu_lo, CLUSTER_16(start_clu));
+	SET16_A(ep->start_clu_hi, CLUSTER_16(start_clu >> 16));
+	SET32_A(ep->size, 0);
+
+	tp = tm_current(&tm);
+	fat_set_entry_time((struct dentry_t *) ep, tp, TM_CREATE);
+	fat_set_entry_time((struct dentry_t *) ep, tp, TM_MODIFY);
+	SET16_A(ep->access_date, 0);
+	ep->create_time_ms = 0;
+}
+
+void init_ext_entry(struct ext_dentry_t *ep, s32 order, u8 chksum, u16 *uniname)
+{
+	int i;
+	u8 end = FALSE;
+
+	fat_set_entry_type((struct dentry_t *) ep, TYPE_EXTEND);
+	ep->order = (u8) order;
+	ep->sysid = 0;
+	ep->checksum = chksum;
+	SET16_A(ep->start_clu, 0);
+
+	for (i = 0; i < 10; i += 2) {
+		if (!end) {
+			SET16(ep->unicode_0_4+i, *uniname);
+			if (*uniname == 0x0)
+				end = TRUE;
+			else
+				uniname++;
+		} else {
+			SET16(ep->unicode_0_4+i, 0xFFFF);
+		}
+	}
+
+	for (i = 0; i < 12; i += 2) {
+		if (!end) {
+			SET16_A(ep->unicode_5_10 + i, *uniname);
+			if (*uniname == 0x0)
+				end = TRUE;
+			else
+				uniname++;
+		} else {
+			SET16_A(ep->unicode_5_10 + i, 0xFFFF);
+		}
+	}
+
+	for (i = 0; i < 4; i += 2) {
+		if (!end) {
+			SET16_A(ep->unicode_11_12 + i, *uniname);
+			if (*uniname == 0x0)
+				end = TRUE;
+			else
+				uniname++;
+		} else {
+			SET16_A(ep->unicode_11_12 + i, 0xFFFF);
+		}
+	}
+}
+
+void init_file_entry(struct file_dentry_t *ep, u32 type)
+{
+	struct timestamp_t tm, *tp;
+
+	exfat_set_entry_type((struct dentry_t *)ep, type);
+
+	tp = tm_current(&tm);
+	exfat_set_entry_time((struct dentry_t *)ep, tp, TM_CREATE);
+	exfat_set_entry_time((struct dentry_t *)ep, tp, TM_MODIFY);
+	exfat_set_entry_time((struct dentry_t *)ep, tp, TM_ACCESS);
+	ep->create_time_ms = 0;
+	ep->modify_time_ms = 0;
+	ep->access_time_ms = 0;
+}
+
+void init_strm_entry(struct strm_dentry_t *ep, u8 flags, u32 start_clu, u64 size)
+{
+	exfat_set_entry_type((struct dentry_t *)ep, TYPE_STREAM);
+	ep->flags = flags;
+	SET32_A(ep->start_clu, start_clu);
+	SET64_A(ep->valid_size, size);
+	SET64_A(ep->size, size);
+}
+
+void init_name_entry(struct name_dentry_t *ep, u16 *uniname)
+{
+	int i;
+
+	exfat_set_entry_type((struct dentry_t *)ep, TYPE_EXTEND);
+	ep->flags = 0x0;
+
+	for (i = 0; i < 30; i++, i++) {
+		SET16_A(ep->unicode_0_14+i, *uniname);
+		if (*uniname == 0x0)
+			break;
+		uniname++;
+	}
+}
+
+void fat_delete_dir_entry(struct super_block *sb, struct chain_t *p_dir,
+		s32 entry, s32 order, s32 num_entries)
+{
+	int i;
+	sector_t sector;
+	struct dentry_t *ep;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+
+	for (i = num_entries-1; i >= order; i--) {
+		ep = get_entry_in_dir(sb, p_dir, entry-i, &sector);
+		if (!ep)
+			return;
+
+		p_fs->fs_func->set_entry_type(ep, TYPE_DELETED);
+		buf_modify(sb, sector);
+	}
+}
+
+void exfat_delete_dir_entry(struct super_block *sb, struct chain_t *p_dir,
+		s32 entry, s32 order, s32 num_entries)
+{
+	int i;
+	sector_t sector;
+	struct dentry_t *ep;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+
+	for (i = order; i < num_entries; i++) {
+		ep = get_entry_in_dir(sb, p_dir, entry+i, &sector);
+		if (!ep)
+			return;
+
+		p_fs->fs_func->set_entry_type(ep, TYPE_DELETED);
+		buf_modify(sb, sector);
+	}
+}
+
+void update_dir_checksum(struct super_block *sb, struct chain_t *p_dir,
+			 s32 entry)
+{
+	int i, num_entries;
+	sector_t sector;
+	u16 chksum;
+	struct file_dentry_t *file_ep;
+	struct dentry_t *ep;
+
+	file_ep = (struct file_dentry_t *)get_entry_in_dir(sb, p_dir, entry,
+							   &sector);
+	if (!file_ep)
+		return;
+
+	buf_lock(sb, sector);
+
+	num_entries = (s32) file_ep->num_ext + 1;
+	chksum = calc_checksum_2byte((void *)file_ep, DENTRY_SIZE, 0,
+				     CS_DIR_ENTRY);
+
+	for (i = 1; i < num_entries; i++) {
+		ep = get_entry_in_dir(sb, p_dir, entry+i, NULL);
+		if (!ep) {
+			buf_unlock(sb, sector);
+			return;
+		}
+
+		chksum = calc_checksum_2byte((void *)ep, DENTRY_SIZE, chksum,
+					     CS_DEFAULT);
+	}
+
+	SET16_A(file_ep->checksum, chksum);
+	buf_modify(sb, sector);
+	buf_unlock(sb, sector);
+}
+
+void update_dir_checksum_with_entry_set(struct super_block *sb,
+					struct entry_set_cache_t *es)
+{
+	struct dentry_t *ep;
+	u16 chksum = 0;
+	s32 chksum_type = CS_DIR_ENTRY, i;
+
+	ep = (struct dentry_t *)&(es->__buf);
+	for (i = 0; i < es->num_entries; i++) {
+		pr_debug("%s ep %p\n", __func__, ep);
+		chksum = calc_checksum_2byte((void *)ep, DENTRY_SIZE, chksum,
+					     chksum_type);
+		ep++;
+		chksum_type = CS_DEFAULT;
+	}
+
+	ep = (struct dentry_t *)&(es->__buf);
+	SET16_A(((struct file_dentry_t *)ep)->checksum, chksum);
+	write_whole_entry_set(sb, es);
+}
+
+static s32 _walk_fat_chain(struct super_block *sb, struct chain_t *p_dir,
+			   s32 byte_offset, u32 *clu)
+{
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+	s32 clu_offset;
+	u32 cur_clu;
+
+	clu_offset = byte_offset >> p_fs->cluster_size_bits;
+	cur_clu = p_dir->dir;
+
+	if (p_dir->flags == 0x03) {
+		cur_clu += clu_offset;
+	} else {
+		while (clu_offset > 0) {
+			if (FAT_read(sb, cur_clu, &cur_clu) == -1)
+				return FFS_MEDIAERR;
+			clu_offset--;
+		}
+	}
+
+	if (clu)
+		*clu = cur_clu;
+	return FFS_SUCCESS;
+}
+
+s32 find_location(struct super_block *sb, struct chain_t *p_dir, s32 entry,
+		  sector_t *sector, s32 *offset)
+{
+	s32 off, ret;
+	u32 clu = 0;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+	struct bd_info_t *p_bd = &(EXFAT_SB(sb)->bd_info);
+
+	off = entry << DENTRY_SIZE_BITS;
+
+	if (p_dir->dir == CLUSTER_32(0)) { /* FAT16 root_dir */
+		*offset = off & p_bd->sector_size_mask;
+		*sector = off >> p_bd->sector_size_bits;
+		*sector += p_fs->root_start_sector;
+	} else {
+		ret = _walk_fat_chain(sb, p_dir, off, &clu);
+		if (ret != FFS_SUCCESS)
+			return ret;
+
+		/* byte offset in cluster */
+		off &= p_fs->cluster_size - 1;
+
+		/* byte offset in sector    */
+		*offset = off & p_bd->sector_size_mask;
+
+		/* sector offset in cluster */
+		*sector = off >> p_bd->sector_size_bits;
+		*sector += START_SECTOR(clu);
+	}
+	return FFS_SUCCESS;
+}
+
+struct dentry_t *get_entry_with_sector(struct super_block *sb, sector_t sector,
+				       s32 offset)
+{
+	u8 *buf;
+
+	buf = buf_getblk(sb, sector);
+
+	if (buf == NULL)
+		return NULL;
+
+	return (struct dentry_t *)(buf + offset);
+}
+
+struct dentry_t *get_entry_in_dir(struct super_block *sb, struct chain_t *p_dir,
+				  s32 entry, sector_t *sector)
+{
+	s32 off;
+	sector_t sec;
+	u8 *buf;
+
+	if (find_location(sb, p_dir, entry, &sec, &off) != FFS_SUCCESS)
+		return NULL;
+
+	buf = buf_getblk(sb, sec);
+
+	if (buf == NULL)
+		return NULL;
+
+	if (sector != NULL)
+		*sector = sec;
+	return (struct dentry_t *)(buf + off);
+}
+
+/* returns a set of dentries for a file or dir.
+ * Note that this is a copy (dump) of dentries so that user should call write_entry_set()
+ * 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.
+ * out:
+ *   file_ep: will point the first dentry(= file dentry) on success
+ * return:
+ *   pointer of entry set on success,
+ *   NULL on failure.
+ */
+
+#define ES_MODE_STARTED				0
+#define ES_MODE_GET_FILE_ENTRY			1
+#define ES_MODE_GET_STRM_ENTRY			2
+#define ES_MODE_GET_NAME_ENTRY			3
+#define ES_MODE_GET_CRITICAL_SEC_ENTRY		4
+struct entry_set_cache_t *get_entry_set_in_dir(struct super_block *sb,
+					       struct chain_t *p_dir, s32 entry,
+					       u32 type,
+					       struct dentry_t **file_ep)
+{
+	s32 off, ret, byte_offset;
+	u32 clu = 0;
+	sector_t sec;
+	u32 entry_type;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+	struct bd_info_t *p_bd = &(EXFAT_SB(sb)->bd_info);
+	struct entry_set_cache_t *es = NULL;
+	struct dentry_t *ep, *pos;
+	u8 *buf;
+	u8 num_entries;
+	s32 mode = ES_MODE_STARTED;
+	size_t bufsize;
+
+	pr_debug("%s entered p_dir dir %u flags %x size %d\n",
+		__func__, p_dir->dir, p_dir->flags, p_dir->size);
+
+	byte_offset = entry << DENTRY_SIZE_BITS;
+	ret = _walk_fat_chain(sb, p_dir, byte_offset, &clu);
+	if (ret != FFS_SUCCESS)
+		return NULL;
+
+
+	/* byte offset in cluster */
+	byte_offset &= p_fs->cluster_size - 1;
+
+	/* byte offset in sector    */
+	off = byte_offset & p_bd->sector_size_mask;
+
+	/* sector offset in cluster */
+	sec = byte_offset >> p_bd->sector_size_bits;
+	sec += START_SECTOR(clu);
+
+	buf = buf_getblk(sb, sec);
+	if (buf == NULL)
+		goto err_out;
+
+
+	ep = (struct dentry_t *)(buf + off);
+	entry_type = p_fs->fs_func->get_entry_type(ep);
+
+	if ((entry_type != TYPE_FILE)
+		&& (entry_type != TYPE_DIR))
+		goto err_out;
+
+	if (type == ES_ALL_ENTRIES)
+		num_entries = ((struct file_dentry_t *)ep)->num_ext+1;
+	else
+		num_entries = type;
+
+	bufsize = offsetof(struct entry_set_cache_t, __buf) + (num_entries) *
+		  sizeof(struct dentry_t);
+	pr_debug("%s: trying to kmalloc %zx bytes for %d entries\n", __func__,
+		 bufsize, num_entries);
+	es = kmalloc(bufsize, GFP_KERNEL);
+	if (es == NULL)
+		goto err_out;
+
+	es->num_entries = num_entries;
+	es->sector = sec;
+	es->offset = off;
+	es->alloc_flag = p_dir->flags;
+
+	pos = (struct dentry_t *) &(es->__buf);
+
+	while (num_entries) {
+		/*
+		 * instead of copying whole sector, we will check every entry.
+		 * this will provide minimum stablity and consistancy.
+		 */
+		entry_type = p_fs->fs_func->get_entry_type(ep);
+
+		if ((entry_type == TYPE_UNUSED) || (entry_type == TYPE_DELETED))
+			goto err_out;
+
+		switch (mode) {
+		case ES_MODE_STARTED:
+			if ((entry_type == TYPE_FILE) || (entry_type == TYPE_DIR))
+				mode = ES_MODE_GET_FILE_ENTRY;
+			else
+				goto err_out;
+			break;
+		case ES_MODE_GET_FILE_ENTRY:
+			if (entry_type == TYPE_STREAM)
+				mode = ES_MODE_GET_STRM_ENTRY;
+			else
+				goto err_out;
+			break;
+		case ES_MODE_GET_STRM_ENTRY:
+			if (entry_type == TYPE_EXTEND)
+				mode = ES_MODE_GET_NAME_ENTRY;
+			else
+				goto err_out;
+			break;
+		case ES_MODE_GET_NAME_ENTRY:
+			if (entry_type == TYPE_EXTEND)
+				break;
+			else if (entry_type == TYPE_STREAM)
+				goto err_out;
+			else if (entry_type & TYPE_CRITICAL_SEC)
+				mode = ES_MODE_GET_CRITICAL_SEC_ENTRY;
+			else
+				goto err_out;
+			break;
+		case ES_MODE_GET_CRITICAL_SEC_ENTRY:
+			if ((entry_type == TYPE_EXTEND) ||
+			    (entry_type == TYPE_STREAM))
+				goto err_out;
+			else if ((entry_type & TYPE_CRITICAL_SEC) !=
+				 TYPE_CRITICAL_SEC)
+				goto err_out;
+			break;
+		}
+
+		memcpy(pos, ep, sizeof(struct dentry_t));
+
+		if (--num_entries == 0)
+			break;
+
+		if (((off + DENTRY_SIZE) & p_bd->sector_size_mask) <
+		    (off &  p_bd->sector_size_mask)) {
+			/* get the next sector */
+			if (IS_LAST_SECTOR_IN_CLUSTER(sec)) {
+				if (es->alloc_flag == 0x03) {
+					clu++;
+				} else {
+					if (FAT_read(sb, clu, &clu) == -1)
+						goto err_out;
+				}
+				sec = START_SECTOR(clu);
+			} else {
+				sec++;
+			}
+			buf = buf_getblk(sb, sec);
+			if (buf == NULL)
+				goto err_out;
+			off = 0;
+			ep = (struct dentry_t *)(buf);
+		} else {
+			ep++;
+			off += DENTRY_SIZE;
+		}
+		pos++;
+	}
+
+	if (file_ep)
+		*file_ep = (struct dentry_t *)&(es->__buf);
+
+	pr_debug("%s exiting es %p sec %llu offset %d flags %d, num_entries %u buf ptr %p\n",
+		   __func__, es, (unsigned long long)es->sector, es->offset,
+		   es->alloc_flag, es->num_entries, &es->__buf);
+	return es;
+err_out:
+	pr_debug("%s exited NULL (es %p)\n", __func__, es);
+	kfree(es);
+	return NULL;
+}
+
+void release_entry_set(struct entry_set_cache_t *es)
+{
+	pr_debug("%s es=%p\n", __func__, es);
+	kfree(es);
+}
+
+
+static s32 __write_partial_entries_in_entry_set(struct super_block *sb,
+						struct entry_set_cache_t *es,
+						sector_t sec, s32 off, u32 count)
+{
+	s32 num_entries, buf_off = (off - es->offset);
+	u32 remaining_byte_in_sector, copy_entries;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+	struct bd_info_t *p_bd = &(EXFAT_SB(sb)->bd_info);
+	u32 clu;
+	u8 *buf, *esbuf = (u8 *)&(es->__buf);
+
+	pr_debug("%s entered es %p sec %llu off %d count %d\n",
+		__func__, es, (unsigned long long)sec, off, count);
+	num_entries = count;
+
+	while (num_entries) {
+		/* white per sector base */
+		remaining_byte_in_sector = (1 << p_bd->sector_size_bits) - off;
+		copy_entries = min_t(s32,
+				     remaining_byte_in_sector >> DENTRY_SIZE_BITS,
+				     num_entries);
+		buf = buf_getblk(sb, sec);
+		if (buf == NULL)
+			goto err_out;
+		pr_debug("es->buf %p buf_off %u\n", esbuf, buf_off);
+		pr_debug("copying %d entries from %p to sector %llu\n",
+			copy_entries, (esbuf + buf_off),
+			(unsigned long long)sec);
+		memcpy(buf + off, esbuf + buf_off,
+		       copy_entries << DENTRY_SIZE_BITS);
+		buf_modify(sb, sec);
+		num_entries -= copy_entries;
+
+		if (num_entries) {
+			/* get next sector */
+			if (IS_LAST_SECTOR_IN_CLUSTER(sec)) {
+				clu = GET_CLUSTER_FROM_SECTOR(sec);
+				if (es->alloc_flag == 0x03) {
+					clu++;
+				} else {
+					if (FAT_read(sb, clu, &clu) == -1)
+						goto err_out;
+				}
+				sec = START_SECTOR(clu);
+			} else {
+				sec++;
+			}
+			off = 0;
+			buf_off += copy_entries << DENTRY_SIZE_BITS;
+		}
+	}
+
+	pr_debug("%s exited successfully\n", __func__);
+	return FFS_SUCCESS;
+err_out:
+	pr_debug("%s failed\n", __func__);
+	return FFS_ERROR;
+}
+
+/* write back all entries in entry set */
+s32 write_whole_entry_set(struct super_block *sb, struct entry_set_cache_t *es)
+{
+	return __write_partial_entries_in_entry_set(sb, es, es->sector,
+						    es->offset,
+						    es->num_entries);
+}
+
+/* write back some entries in entry set */
+s32 write_partial_entries_in_entry_set(struct super_block *sb,
+	struct entry_set_cache_t *es, struct dentry_t *ep, u32 count)
+{
+	s32 ret, byte_offset, off;
+	u32 clu = 0;
+	sector_t sec;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+	struct bd_info_t *p_bd = &(EXFAT_SB(sb)->bd_info);
+	struct chain_t dir;
+
+	/* vaidity check */
+	if (ep + count  > ((struct dentry_t *)&(es->__buf)) + es->num_entries)
+		return FFS_ERROR;
+
+	dir.dir = GET_CLUSTER_FROM_SECTOR(es->sector);
+	dir.flags = es->alloc_flag;
+	dir.size = 0xffffffff;		/* XXX */
+
+	byte_offset = (es->sector - START_SECTOR(dir.dir)) <<
+			p_bd->sector_size_bits;
+	byte_offset += ((void **)ep - &(es->__buf)) + es->offset;
+
+	ret = _walk_fat_chain(sb, &dir, byte_offset, &clu);
+	if (ret != FFS_SUCCESS)
+		return ret;
+
+	/* byte offset in cluster */
+	byte_offset &= p_fs->cluster_size - 1;
+
+	/* byte offset in sector    */
+	off = byte_offset & p_bd->sector_size_mask;
+
+	/* sector offset in cluster */
+	sec = byte_offset >> p_bd->sector_size_bits;
+	sec += START_SECTOR(clu);
+	return __write_partial_entries_in_entry_set(sb, es, sec, off, count);
+}
+
+/* search EMPTY CONTINUOUS "num_entries" entries */
+s32 search_deleted_or_unused_entry(struct super_block *sb,
+				   struct chain_t *p_dir, s32 num_entries)
+{
+	int i, dentry, num_empty = 0;
+	s32 dentries_per_clu;
+	u32 type;
+	struct chain_t clu;
+	struct dentry_t *ep;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+
+	if (p_dir->dir == CLUSTER_32(0)) /* FAT16 root_dir */
+		dentries_per_clu = p_fs->dentries_in_root;
+	else
+		dentries_per_clu = p_fs->dentries_per_clu;
+
+	if (p_fs->hint_uentry.dir == p_dir->dir) {
+		if (p_fs->hint_uentry.entry == -1)
+			return -1;
+
+		clu.dir = p_fs->hint_uentry.clu.dir;
+		clu.size = p_fs->hint_uentry.clu.size;
+		clu.flags = p_fs->hint_uentry.clu.flags;
+
+		dentry = p_fs->hint_uentry.entry;
+	} else {
+		p_fs->hint_uentry.entry = -1;
+
+		clu.dir = p_dir->dir;
+		clu.size = p_dir->size;
+		clu.flags = p_dir->flags;
+
+		dentry = 0;
+	}
+
+	while (clu.dir != CLUSTER_32(~0)) {
+		if (p_fs->dev_ejected)
+			break;
+
+		if (p_dir->dir == CLUSTER_32(0)) /* FAT16 root_dir */
+			i = dentry % dentries_per_clu;
+		else
+			i = dentry & (dentries_per_clu-1);
+
+		for (; i < dentries_per_clu; i++, dentry++) {
+			ep = get_entry_in_dir(sb, &clu, i, NULL);
+			if (!ep)
+				return -1;
+
+			type = p_fs->fs_func->get_entry_type(ep);
+
+			if (type == TYPE_UNUSED) {
+				num_empty++;
+				if (p_fs->hint_uentry.entry == -1) {
+					p_fs->hint_uentry.dir = p_dir->dir;
+					p_fs->hint_uentry.entry = dentry;
+
+					p_fs->hint_uentry.clu.dir = clu.dir;
+					p_fs->hint_uentry.clu.size = clu.size;
+					p_fs->hint_uentry.clu.flags = clu.flags;
+				}
+			} else if (type == TYPE_DELETED) {
+				num_empty++;
+			} else {
+				num_empty = 0;
+			}
+
+			if (num_empty >= num_entries) {
+				p_fs->hint_uentry.dir = CLUSTER_32(~0);
+				p_fs->hint_uentry.entry = -1;
+
+				if (p_fs->vol_type == EXFAT)
+					return dentry - (num_entries-1);
+				else
+					return dentry;
+			}
+		}
+
+		if (p_dir->dir == CLUSTER_32(0))
+			break; /* FAT16 root_dir */
+
+		if (clu.flags == 0x03) {
+			if ((--clu.size) > 0)
+				clu.dir++;
+			else
+				clu.dir = CLUSTER_32(~0);
+		} else {
+			if (FAT_read(sb, clu.dir, &clu.dir) != 0)
+				return -1;
+		}
+	}
+
+	return -1;
+}
+
+s32 find_empty_entry(struct inode *inode, struct chain_t *p_dir, s32 num_entries)
+{
+	s32 ret, dentry;
+	u32 last_clu;
+	sector_t sector;
+	u64 size = 0;
+	struct chain_t clu;
+	struct dentry_t *ep = NULL;
+	struct super_block *sb = inode->i_sb;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+	struct file_id_t *fid = &(EXFAT_I(inode)->fid);
+
+	if (p_dir->dir == CLUSTER_32(0)) /* FAT16 root_dir */
+		return search_deleted_or_unused_entry(sb, p_dir, num_entries);
+
+	while ((dentry = search_deleted_or_unused_entry(sb, p_dir, num_entries)) < 0) {
+		if (p_fs->dev_ejected)
+			break;
+
+		if (p_fs->vol_type == EXFAT) {
+			if (p_dir->dir != p_fs->root_dir)
+				size = i_size_read(inode);
+		}
+
+		last_clu = find_last_cluster(sb, p_dir);
+		clu.dir = last_clu + 1;
+		clu.size = 0;
+		clu.flags = p_dir->flags;
+
+		/* (1) allocate a cluster */
+		ret = p_fs->fs_func->alloc_cluster(sb, 1, &clu);
+		if (ret < 1)
+			return -1;
+
+		if (clear_cluster(sb, clu.dir) != FFS_SUCCESS)
+			return -1;
+
+		/* (2) append to the FAT chain */
+		if (clu.flags != p_dir->flags) {
+			exfat_chain_cont_cluster(sb, p_dir->dir, p_dir->size);
+			p_dir->flags = 0x01;
+			p_fs->hint_uentry.clu.flags = 0x01;
+		}
+		if (clu.flags == 0x01)
+			if (FAT_write(sb, last_clu, clu.dir) < 0)
+				return -1;
+
+		if (p_fs->hint_uentry.entry == -1) {
+			p_fs->hint_uentry.dir = p_dir->dir;
+			p_fs->hint_uentry.entry = p_dir->size << (p_fs->cluster_size_bits - DENTRY_SIZE_BITS);
+
+			p_fs->hint_uentry.clu.dir = clu.dir;
+			p_fs->hint_uentry.clu.size = 0;
+			p_fs->hint_uentry.clu.flags = clu.flags;
+		}
+		p_fs->hint_uentry.clu.size++;
+		p_dir->size++;
+
+		/* (3) update the directory entry */
+		if (p_fs->vol_type == EXFAT) {
+			if (p_dir->dir != p_fs->root_dir) {
+				size += p_fs->cluster_size;
+
+				ep = get_entry_in_dir(sb, &fid->dir,
+						      fid->entry + 1, &sector);
+				if (!ep)
+					return -1;
+				p_fs->fs_func->set_entry_size(ep, size);
+				p_fs->fs_func->set_entry_flag(ep, p_dir->flags);
+				buf_modify(sb, sector);
+
+				update_dir_checksum(sb, &(fid->dir),
+						    fid->entry);
+			}
+		}
+
+		i_size_write(inode, i_size_read(inode)+p_fs->cluster_size);
+		EXFAT_I(inode)->mmu_private += p_fs->cluster_size;
+		EXFAT_I(inode)->fid.size += p_fs->cluster_size;
+		EXFAT_I(inode)->fid.flags = p_dir->flags;
+		inode->i_blocks += 1 << (p_fs->cluster_size_bits - 9);
+	}
+
+	return dentry;
+}
+
+/* return values of fat_find_dir_entry()
+ * >= 0 : return dir entiry position with the name in dir
+ * -1 : (root dir, ".") it is the root dir itself
+ * -2 : entry with the name does not exist
+ */
+s32 fat_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)
+{
+	int i, dentry = 0, lossy = FALSE, len;
+	s32 order = 0, is_feasible_entry = TRUE, has_ext_entry = FALSE;
+	s32 dentries_per_clu;
+	u32 entry_type;
+	u16 entry_uniname[14], *uniname = NULL, unichar;
+	struct chain_t clu;
+	struct dentry_t *ep;
+	struct dos_dentry_t *dos_ep;
+	struct ext_dentry_t *ext_ep;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+
+	if (p_dir->dir == p_fs->root_dir) {
+		if ((!nls_uniname_cmp(sb, p_uniname->name,
+				      (u16 *)UNI_CUR_DIR_NAME)) ||
+			(!nls_uniname_cmp(sb, p_uniname->name,
+					  (u16 *)UNI_PAR_DIR_NAME)))
+			return -1; // special case, root directory itself
+	}
+
+	if (p_dir->dir == CLUSTER_32(0)) /* FAT16 root_dir */
+		dentries_per_clu = p_fs->dentries_in_root;
+	else
+		dentries_per_clu = p_fs->dentries_per_clu;
+
+	clu.dir = p_dir->dir;
+	clu.flags = p_dir->flags;
+
+	while (clu.dir != CLUSTER_32(~0)) {
+		if (p_fs->dev_ejected)
+			break;
+
+		for (i = 0; i < dentries_per_clu; i++, dentry++) {
+			ep = get_entry_in_dir(sb, &clu, i, NULL);
+			if (!ep)
+				return -2;
+
+			entry_type = p_fs->fs_func->get_entry_type(ep);
+
+			if ((entry_type == TYPE_FILE) || (entry_type == TYPE_DIR)) {
+				if ((type == TYPE_ALL) || (type == entry_type)) {
+					if (is_feasible_entry && has_ext_entry)
+						return dentry;
+
+					dos_ep = (struct dos_dentry_t *) ep;
+					if ((!lossy) && (!nls_dosname_cmp(sb, p_dosname->name, dos_ep->name)))
+						return dentry;
+				}
+				is_feasible_entry = TRUE;
+				has_ext_entry = FALSE;
+			} else if (entry_type == TYPE_EXTEND) {
+				if (is_feasible_entry) {
+					ext_ep = (struct ext_dentry_t *) ep;
+					if (ext_ep->order > 0x40) {
+						order = (s32)(ext_ep->order - 0x40);
+						uniname = p_uniname->name + 13 * (order-1);
+					} else {
+						order = (s32) ext_ep->order;
+						uniname -= 13;
+					}
+
+					len = extract_uni_name_from_ext_entry(ext_ep, entry_uniname, order);
+
+					unichar = *(uniname+len);
+					*(uniname+len) = 0x0;
+
+					if (nls_uniname_cmp(sb, uniname, entry_uniname))
+						is_feasible_entry = FALSE;
+
+					*(uniname+len) = unichar;
+				}
+				has_ext_entry = TRUE;
+			} else if (entry_type == TYPE_UNUSED) {
+				return -2;
+			}
+			is_feasible_entry = TRUE;
+			has_ext_entry = FALSE;
+		}
+
+		if (p_dir->dir == CLUSTER_32(0))
+			break; /* FAT16 root_dir */
+
+		if (FAT_read(sb, clu.dir, &clu.dir) != 0)
+			return -2;
+	}
+
+	return -2;
+}
+
+/* return values of exfat_find_dir_entry()
+ * >= 0 : return dir entiry position with the name in dir
+ * -1 : (root dir, ".") it is the root dir itself
+ * -2 : entry with the name does not exist
+ */
+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)
+{
+	int i = 0, dentry = 0, num_ext_entries = 0, len, step;
+	s32 order = 0, is_feasible_entry = FALSE;
+	s32 dentries_per_clu, num_empty = 0;
+	u32 entry_type;
+	u16 entry_uniname[16], *uniname = NULL, unichar;
+	struct chain_t clu;
+	struct dentry_t *ep;
+	struct file_dentry_t *file_ep;
+	struct strm_dentry_t *strm_ep;
+	struct name_dentry_t *name_ep;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+
+	if (p_dir->dir == p_fs->root_dir) {
+		if ((!nls_uniname_cmp(sb, p_uniname->name,
+				      (u16 *)UNI_CUR_DIR_NAME)) ||
+			(!nls_uniname_cmp(sb, p_uniname->name,
+					  (u16 *)UNI_PAR_DIR_NAME)))
+			return -1; // special case, root directory itself
+	}
+
+	if (p_dir->dir == CLUSTER_32(0)) /* FAT16 root_dir */
+		dentries_per_clu = p_fs->dentries_in_root;
+	else
+		dentries_per_clu = p_fs->dentries_per_clu;
+
+	clu.dir = p_dir->dir;
+	clu.size = p_dir->size;
+	clu.flags = p_dir->flags;
+
+	p_fs->hint_uentry.dir = p_dir->dir;
+	p_fs->hint_uentry.entry = -1;
+
+	while (clu.dir != CLUSTER_32(~0)) {
+		if (p_fs->dev_ejected)
+			break;
+
+		while (i < dentries_per_clu) {
+			ep = get_entry_in_dir(sb, &clu, i, NULL);
+			if (!ep)
+				return -2;
+
+			entry_type = p_fs->fs_func->get_entry_type(ep);
+			step = 1;
+
+			if ((entry_type == TYPE_UNUSED) || (entry_type == TYPE_DELETED)) {
+				is_feasible_entry = FALSE;
+
+				if (p_fs->hint_uentry.entry == -1) {
+					num_empty++;
+
+					if (num_empty == 1) {
+						p_fs->hint_uentry.clu.dir = clu.dir;
+						p_fs->hint_uentry.clu.size = clu.size;
+						p_fs->hint_uentry.clu.flags = clu.flags;
+					}
+					if ((num_empty >= num_entries) || (entry_type == TYPE_UNUSED))
+						p_fs->hint_uentry.entry = dentry - (num_empty-1);
+				}
+
+				if (entry_type == TYPE_UNUSED)
+					return -2;
+			} else {
+				num_empty = 0;
+
+				if ((entry_type == TYPE_FILE) || (entry_type == TYPE_DIR)) {
+					file_ep = (struct file_dentry_t *) ep;
+					if ((type == TYPE_ALL) || (type == entry_type)) {
+						num_ext_entries = file_ep->num_ext;
+						is_feasible_entry = TRUE;
+					} else {
+						is_feasible_entry = FALSE;
+						step = file_ep->num_ext + 1;
+					}
+				} else if (entry_type == TYPE_STREAM) {
+					if (is_feasible_entry) {
+						strm_ep = (struct strm_dentry_t *)ep;
+						if (p_uniname->name_hash == GET16_A(strm_ep->name_hash) &&
+						    p_uniname->name_len == strm_ep->name_len) {
+							order = 1;
+						} else {
+							is_feasible_entry = FALSE;
+							step = num_ext_entries;
+						}
+					}
+				} else if (entry_type == TYPE_EXTEND) {
+					if (is_feasible_entry) {
+						name_ep = (struct name_dentry_t *)ep;
+
+						if ((++order) == 2)
+							uniname = p_uniname->name;
+						else
+							uniname += 15;
+
+						len = extract_uni_name_from_name_entry(name_ep,
+								entry_uniname, order);
+
+						unichar = *(uniname+len);
+						*(uniname+len) = 0x0;
+
+						if (nls_uniname_cmp(sb, uniname, entry_uniname)) {
+							is_feasible_entry = FALSE;
+							step = num_ext_entries - order + 1;
+						} else if (order == num_ext_entries) {
+							p_fs->hint_uentry.dir = CLUSTER_32(~0);
+							p_fs->hint_uentry.entry = -1;
+							return dentry - (num_ext_entries);
+						}
+
+						*(uniname+len) = unichar;
+					}
+				} else {
+					is_feasible_entry = FALSE;
+				}
+			}
+
+			i += step;
+			dentry += step;
+		}
+
+		i -= dentries_per_clu;
+
+		if (p_dir->dir == CLUSTER_32(0))
+			break; /* FAT16 root_dir */
+
+		if (clu.flags == 0x03) {
+			if ((--clu.size) > 0)
+				clu.dir++;
+			else
+				clu.dir = CLUSTER_32(~0);
+		} else {
+			if (FAT_read(sb, clu.dir, &clu.dir) != 0)
+				return -2;
+		}
+	}
+
+	return -2;
+}
+
+s32 fat_count_ext_entries(struct super_block *sb, struct chain_t *p_dir,
+			  s32 entry, struct dentry_t *p_entry)
+{
+	s32 count = 0;
+	u8 chksum;
+	struct dos_dentry_t *dos_ep = (struct dos_dentry_t *) p_entry;
+	struct ext_dentry_t *ext_ep;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+
+	chksum = calc_checksum_1byte((void *) dos_ep->name, DOS_NAME_LENGTH, 0);
+
+	for (entry--; entry >= 0; entry--) {
+		ext_ep = (struct ext_dentry_t *)get_entry_in_dir(sb, p_dir,
+								 entry, NULL);
+		if (!ext_ep)
+			return -1;
+
+		if ((p_fs->fs_func->get_entry_type((struct dentry_t *)ext_ep) ==
+		     TYPE_EXTEND) && (ext_ep->checksum == chksum)) {
+			count++;
+			if (ext_ep->order > 0x40)
+				return count;
+		} else {
+			return count;
+		}
+	}
+
+	return count;
+}
+
+s32 exfat_count_ext_entries(struct super_block *sb, struct chain_t *p_dir,
+			    s32 entry, struct dentry_t *p_entry)
+{
+	int i, count = 0;
+	u32 type;
+	struct file_dentry_t *file_ep = (struct file_dentry_t *)p_entry;
+	struct dentry_t *ext_ep;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+
+	for (i = 0, entry++; i < file_ep->num_ext; i++, entry++) {
+		ext_ep = get_entry_in_dir(sb, p_dir, entry, NULL);
+		if (!ext_ep)
+			return -1;
+
+		type = p_fs->fs_func->get_entry_type(ext_ep);
+		if ((type == TYPE_EXTEND) || (type == TYPE_STREAM))
+			count++;
+		else
+			return count;
+	}
+
+	return count;
+}
+
+s32 count_dos_name_entries(struct super_block *sb, struct chain_t *p_dir,
+			   u32 type)
+{
+	int i, count = 0;
+	s32 dentries_per_clu;
+	u32 entry_type;
+	struct chain_t clu;
+	struct dentry_t *ep;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+
+	if (p_dir->dir == CLUSTER_32(0)) /* FAT16 root_dir */
+		dentries_per_clu = p_fs->dentries_in_root;
+	else
+		dentries_per_clu = p_fs->dentries_per_clu;
+
+	clu.dir = p_dir->dir;
+	clu.size = p_dir->size;
+	clu.flags = p_dir->flags;
+
+	while (clu.dir != CLUSTER_32(~0)) {
+		if (p_fs->dev_ejected)
+			break;
+
+		for (i = 0; i < dentries_per_clu; i++) {
+			ep = get_entry_in_dir(sb, &clu, i, NULL);
+			if (!ep)
+				return -1;
+
+			entry_type = p_fs->fs_func->get_entry_type(ep);
+
+			if (entry_type == TYPE_UNUSED)
+				return count;
+			if (!(type & TYPE_CRITICAL_PRI) &&
+			    !(type & TYPE_BENIGN_PRI))
+				continue;
+
+			if ((type == TYPE_ALL) || (type == entry_type))
+				count++;
+		}
+
+		if (p_dir->dir == CLUSTER_32(0))
+			break; /* FAT16 root_dir */
+
+		if (clu.flags == 0x03) {
+			if ((--clu.size) > 0)
+				clu.dir++;
+			else
+				clu.dir = CLUSTER_32(~0);
+		} else {
+			if (FAT_read(sb, clu.dir, &clu.dir) != 0)
+				return -1;
+		}
+	}
+
+	return count;
+}
+
+bool is_dir_empty(struct super_block *sb, struct chain_t *p_dir)
+{
+	int i, count = 0;
+	s32 dentries_per_clu;
+	u32 type;
+	struct chain_t clu;
+	struct dentry_t *ep;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+
+	if (p_dir->dir == CLUSTER_32(0)) /* FAT16 root_dir */
+		dentries_per_clu = p_fs->dentries_in_root;
+	else
+		dentries_per_clu = p_fs->dentries_per_clu;
+
+	clu.dir = p_dir->dir;
+	clu.size = p_dir->size;
+	clu.flags = p_dir->flags;
+
+	while (clu.dir != CLUSTER_32(~0)) {
+		if (p_fs->dev_ejected)
+			break;
+
+		for (i = 0; i < dentries_per_clu; i++) {
+			ep = get_entry_in_dir(sb, &clu, i, NULL);
+			if (!ep)
+				break;
+
+			type = p_fs->fs_func->get_entry_type(ep);
+
+			if (type == TYPE_UNUSED)
+				return TRUE;
+			if ((type != TYPE_FILE) && (type != TYPE_DIR))
+				continue;
+
+			if (p_dir->dir == CLUSTER_32(0)) /* FAT16 root_dir */
+				return FALSE;
+
+			if (p_fs->vol_type == EXFAT)
+				return FALSE;
+			if ((p_dir->dir == p_fs->root_dir) || ((++count) > 2))
+				return FALSE;
+		}
+
+		if (p_dir->dir == CLUSTER_32(0))
+			break; /* FAT16 root_dir */
+
+		if (clu.flags == 0x03) {
+			if ((--clu.size) > 0)
+				clu.dir++;
+			else
+				clu.dir = CLUSTER_32(~0);
+		}
+		if (FAT_read(sb, clu.dir, &clu.dir) != 0)
+			break;
+	}
+
+	return TRUE;
+}
+
+/*
+ *  Name Conversion Functions
+ */
+
+/* input  : dir, uni_name
+ * output : num_of_entry, dos_name(format : aaaaaa~1.bbb)
+ */
+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 ret, num_entries;
+	bool lossy = false;
+	char **r;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+
+	num_entries = p_fs->fs_func->calc_num_entries(p_uniname);
+	if (num_entries == 0)
+		return FFS_INVALIDPATH;
+
+	if (p_fs->vol_type != EXFAT) {
+		nls_uniname_to_dosname(sb, p_dosname, p_uniname, &lossy);
+
+		if (lossy) {
+			ret = fat_generate_dos_name(sb, p_dir, p_dosname);
+			if (ret)
+				return ret;
+		} else {
+			for (r = reserved_names; *r; r++) {
+				if (!strncmp((void *)p_dosname->name, *r, 8))
+					return FFS_INVALIDPATH;
+			}
+
+			if (p_dosname->name_case != 0xFF)
+				num_entries = 1;
+		}
+
+		if (num_entries > 1)
+			p_dosname->name_case = 0x0;
+	}
+
+	*entries = num_entries;
+
+	return FFS_SUCCESS;
+}
+
+void get_uni_name_from_dos_entry(struct super_block *sb,
+				 struct dos_dentry_t *ep,
+				 struct uni_name_t *p_uniname, u8 mode)
+{
+	struct dos_name_t dos_name;
+
+	if (mode == 0x0)
+		dos_name.name_case = 0x0;
+	else
+		dos_name.name_case = ep->lcase;
+
+	memcpy(dos_name.name, ep->name, DOS_NAME_LENGTH);
+	nls_dosname_to_uniname(sb, p_uniname, &dos_name);
+}
+
+void fat_get_uni_name_from_ext_entry(struct super_block *sb,
+				     struct chain_t *p_dir, s32 entry,
+				     u16 *uniname)
+{
+	int i;
+	struct ext_dentry_t *ep;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+
+	for (entry--, i = 1; entry >= 0; entry--, i++) {
+		ep = (struct ext_dentry_t *)get_entry_in_dir(sb, p_dir, entry,
+							     NULL);
+		if (!ep)
+			return;
+
+		if (p_fs->fs_func->get_entry_type((struct dentry_t *)ep) ==
+		    TYPE_EXTEND) {
+			extract_uni_name_from_ext_entry(ep, uniname, i);
+			if (ep->order > 0x40)
+				return;
+		} else {
+			return;
+		}
+
+		uniname += 13;
+	}
+}
+
+void exfat_get_uni_name_from_ext_entry(struct super_block *sb,
+				       struct chain_t *p_dir, s32 entry,
+				       u16 *uniname)
+{
+	int i;
+	struct dentry_t *ep;
+	struct entry_set_cache_t *es;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+
+	es = get_entry_set_in_dir(sb, p_dir, entry, ES_ALL_ENTRIES, &ep);
+	if (es == NULL || es->num_entries < 3) {
+		if (es)
+			release_entry_set(es);
+		return;
+	}
+
+	ep += 2;
+
+	/*
+	 * First entry  : file entry
+	 * Second entry : stream-extension entry
+	 * 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++, ep++) {
+		if (p_fs->fs_func->get_entry_type(ep) == TYPE_EXTEND)
+			extract_uni_name_from_name_entry((struct name_dentry_t *)
+							 ep, uniname, i);
+		else
+			goto out;
+		uniname += 15;
+	}
+
+out:
+	release_entry_set(es);
+}
+
+s32 extract_uni_name_from_ext_entry(struct ext_dentry_t *ep, u16 *uniname,
+				    s32 order)
+{
+	int i, len = 0;
+
+	for (i = 0; i < 10; i += 2) {
+		*uniname = GET16(ep->unicode_0_4 + i);
+		if (*uniname == 0x0)
+			return len;
+		uniname++;
+		len++;
+	}
+
+	if (order < 20) {
+		for (i = 0; i < 12; i += 2) {
+			*uniname = GET16_A(ep->unicode_5_10 + i);
+			if (*uniname == 0x0)
+				return len;
+			uniname++;
+			len++;
+		}
+	} else {
+		for (i = 0; i < 8; i += 2) {
+			*uniname = GET16_A(ep->unicode_5_10 + i);
+			if (*uniname == 0x0)
+				return len;
+			uniname++;
+			len++;
+		}
+		*uniname = 0x0; /* uniname[MAX_NAME_LENGTH-1] */
+		return len;
+	}
+
+	for (i = 0; i < 4; i += 2) {
+		*uniname = GET16_A(ep->unicode_11_12 + i);
+		if (*uniname == 0x0)
+			return len;
+		uniname++;
+		len++;
+	}
+
+	*uniname = 0x0;
+	return len;
+}
+
+s32 extract_uni_name_from_name_entry(struct name_dentry_t *ep, u16 *uniname,
+				     s32 order)
+{
+	int i, len = 0;
+
+	for (i = 0; i < 30; i += 2) {
+		*uniname = GET16_A(ep->unicode_0_14 + i);
+		if (*uniname == 0x0)
+			return len;
+		uniname++;
+		len++;
+	}
+
+	*uniname = 0x0;
+	return len;
+}
+
+s32 fat_generate_dos_name(struct super_block *sb, struct chain_t *p_dir,
+			  struct dos_name_t *p_dosname)
+{
+	int i, j, count = 0, count_begin = FALSE;
+	s32 dentries_per_clu;
+	u32 type;
+	u8 bmap[128/* 1 ~ 1023 */];
+	struct chain_t clu;
+	struct dos_dentry_t *ep;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+
+	memset(bmap, 0, sizeof(bmap));
+	exfat_bitmap_set(bmap, 0);
+
+	if (p_dir->dir == CLUSTER_32(0)) /* FAT16 root_dir */
+		dentries_per_clu = p_fs->dentries_in_root;
+	else
+		dentries_per_clu = p_fs->dentries_per_clu;
+
+	clu.dir = p_dir->dir;
+	clu.flags = p_dir->flags;
+
+	while (clu.dir != CLUSTER_32(~0)) {
+		if (p_fs->dev_ejected)
+			break;
+
+		for (i = 0; i < dentries_per_clu; i++) {
+			ep = (struct dos_dentry_t *)get_entry_in_dir(sb, &clu,
+								     i, NULL);
+			if (!ep)
+				return FFS_MEDIAERR;
+
+			type = p_fs->fs_func->get_entry_type((struct dentry_t *)
+							     ep);
+
+			if (type == TYPE_UNUSED)
+				break;
+			if ((type != TYPE_FILE) && (type != TYPE_DIR))
+				continue;
+
+			count = 0;
+			count_begin = FALSE;
+
+			for (j = 0; j < 8; j++) {
+				if (ep->name[j] == ' ')
+					break;
+
+				if (ep->name[j] == '~') {
+					count_begin = TRUE;
+				} else if (count_begin) {
+					if ((ep->name[j] >= '0') &&
+					    (ep->name[j] <= '9')) {
+						count = count * 10 +
+							(ep->name[j] - '0');
+					} else {
+						count = 0;
+						count_begin = FALSE;
+					}
+				}
+			}
+
+			if ((count > 0) && (count < 1024))
+				exfat_bitmap_set(bmap, count);
+		}
+
+		if (p_dir->dir == CLUSTER_32(0))
+			break; /* FAT16 root_dir */
+
+		if (FAT_read(sb, clu.dir, &clu.dir) != 0)
+			return FFS_MEDIAERR;
+	}
+
+	count = 0;
+	for (i = 0; i < 128; i++) {
+		if (bmap[i] != 0xFF) {
+			for (j = 0; j < 8; j++) {
+				if (exfat_bitmap_test(&bmap[i], j) == 0) {
+					count = (i << 3) + j;
+					break;
+				}
+			}
+			if (count != 0)
+				break;
+		}
+	}
+
+	if ((count == 0) || (count >= 1024))
+		return FFS_FILEEXIST;
+	fat_attach_count_to_dos_name(p_dosname->name, count);
+
+	/* Now dos_name has DOS~????.EXT */
+	return FFS_SUCCESS;
+}
+
+void fat_attach_count_to_dos_name(u8 *dosname, s32 count)
+{
+	int i, j, length;
+	char str_count[6];
+
+	snprintf(str_count, sizeof(str_count), "~%d", count);
+	length = strlen(str_count);
+
+	i = 0;
+	j = 0;
+	while (j <= (8 - length)) {
+		i = j;
+		if (dosname[j] == ' ')
+			break;
+		if (dosname[j] & 0x80)
+			j += 2;
+		else
+			j++;
+	}
+
+	for (j = 0; j < length; i++, j++)
+		dosname[i] = (u8)str_count[j];
+
+	if (i == 7)
+		dosname[7] = ' ';
+}
+
+s32 fat_calc_num_entries(struct uni_name_t *p_uniname)
+{
+	s32 len;
+
+	len = p_uniname->name_len;
+	if (len == 0)
+		return 0;
+
+	/* 1 dos name entry + extended entries */
+	return (len - 1) / 13 + 2;
+}
+
+s32 exfat_calc_num_entries(struct uni_name_t *p_uniname)
+{
+	s32 len;
+
+	len = p_uniname->name_len;
+	if (len == 0)
+		return 0;
+
+	/* 1 file entry + 1 stream entry + name entries */
+	return (len - 1) / 15 + 3;
+}
+
+u8 calc_checksum_1byte(void *data, s32 len, u8 chksum)
+{
+	int i;
+	u8 *c = (u8 *)data;
+
+	for (i = 0; i < len; i++, c++)
+		chksum = (((chksum & 1) << 7) | ((chksum & 0xFE) >> 1)) + *c;
+
+	return chksum;
+}
+
+u16 calc_checksum_2byte(void *data, s32 len, u16 chksum, s32 type)
+{
+	int i;
+	u8 *c = (u8 *)data;
+
+	switch (type) {
+	case CS_DIR_ENTRY:
+		for (i = 0; i < len; i++, c++) {
+			if ((i == 2) || (i == 3))
+				continue;
+			chksum = (((chksum & 1) << 15) |
+				  ((chksum & 0xFFFE) >> 1)) + (u16)*c;
+		}
+		break;
+	default
+			:
+		for (i = 0; i < len; i++, c++)
+			chksum = (((chksum & 1) << 15) |
+				  ((chksum & 0xFFFE) >> 1)) + (u16)*c;
+	}
+
+	return chksum;
+}
+
+u32 calc_checksum_4byte(void *data, s32 len, u32 chksum, s32 type)
+{
+	int i;
+	u8 *c = (u8 *)data;
+
+	switch (type) {
+	case CS_PBR_SECTOR:
+		for (i = 0; i < len; i++, c++) {
+			if ((i == 106) || (i == 107) || (i == 112))
+				continue;
+			chksum = (((chksum & 1) << 31) |
+				  ((chksum & 0xFFFFFFFE) >> 1)) + (u32)*c;
+		}
+		break;
+	default
+			:
+		for (i = 0; i < len; i++, c++)
+			chksum = (((chksum & 1) << 31) |
+				  ((chksum & 0xFFFFFFFE) >> 1)) + (u32)*c;
+	}
+
+	return chksum;
+}
+
+/*
+ *  Name Resolution Functions
+ */
+
+/* return values of resolve_path()
+ * > 0 : return the length of the path
+ * < 0 : return error
+ */
+s32 resolve_path(struct inode *inode, char *path, struct chain_t *p_dir,
+		 struct uni_name_t *p_uniname)
+{
+	bool lossy = false;
+	struct super_block *sb = inode->i_sb;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+	struct file_id_t *fid = &(EXFAT_I(inode)->fid);
+
+	if (strlen(path) >= (MAX_NAME_LENGTH * MAX_CHARSET_SIZE))
+		return FFS_INVALIDPATH;
+
+	strcpy(name_buf, path);
+
+	nls_cstring_to_uniname(sb, p_uniname, name_buf, &lossy);
+	if (lossy)
+		return FFS_INVALIDPATH;
+
+	fid->size = i_size_read(inode);
+
+	p_dir->dir = fid->start_clu;
+	p_dir->size = (s32)(fid->size >> p_fs->cluster_size_bits);
+	p_dir->flags = fid->flags;
+
+	return FFS_SUCCESS;
+}
+
+/*
+ *  File Operation Functions
+ */
+static struct fs_func fat_fs_func = {
+	.alloc_cluster = fat_alloc_cluster,
+	.free_cluster = fat_free_cluster,
+	.count_used_clusters = fat_count_used_clusters,
+
+	.init_dir_entry = fat_init_dir_entry,
+	.init_ext_entry = fat_init_ext_entry,
+	.find_dir_entry = fat_find_dir_entry,
+	.delete_dir_entry = fat_delete_dir_entry,
+	.get_uni_name_from_ext_entry = fat_get_uni_name_from_ext_entry,
+	.count_ext_entries = fat_count_ext_entries,
+	.calc_num_entries = fat_calc_num_entries,
+
+	.get_entry_type = fat_get_entry_type,
+	.set_entry_type = fat_set_entry_type,
+	.get_entry_attr = fat_get_entry_attr,
+	.set_entry_attr = fat_set_entry_attr,
+	.get_entry_flag = fat_get_entry_flag,
+	.set_entry_flag = fat_set_entry_flag,
+	.get_entry_clu0 = fat_get_entry_clu0,
+	.set_entry_clu0 = fat_set_entry_clu0,
+	.get_entry_size = fat_get_entry_size,
+	.set_entry_size = fat_set_entry_size,
+	.get_entry_time = fat_get_entry_time,
+	.set_entry_time = fat_set_entry_time,
+};
+
+s32 fat16_mount(struct super_block *sb, struct pbr_sector_t *p_pbr)
+{
+	s32 num_reserved, num_root_sectors;
+	struct bpb16_t *p_bpb = (struct bpb16_t *)p_pbr->bpb;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+	struct bd_info_t *p_bd = &(EXFAT_SB(sb)->bd_info);
+
+	if (p_bpb->num_fats == 0)
+		return FFS_FORMATERR;
+
+	num_root_sectors = GET16(p_bpb->num_root_entries) << DENTRY_SIZE_BITS;
+	num_root_sectors = ((num_root_sectors - 1) >>
+			    p_bd->sector_size_bits) + 1;
+
+	p_fs->sectors_per_clu = p_bpb->sectors_per_clu;
+	p_fs->sectors_per_clu_bits = ilog2(p_bpb->sectors_per_clu);
+	p_fs->cluster_size_bits = p_fs->sectors_per_clu_bits +
+				  p_bd->sector_size_bits;
+	p_fs->cluster_size = 1 << p_fs->cluster_size_bits;
+
+	p_fs->num_FAT_sectors = GET16(p_bpb->num_fat_sectors);
+
+	p_fs->FAT1_start_sector = p_fs->PBR_sector + GET16(p_bpb->num_reserved);
+	if (p_bpb->num_fats == 1)
+		p_fs->FAT2_start_sector = p_fs->FAT1_start_sector;
+	else
+		p_fs->FAT2_start_sector = p_fs->FAT1_start_sector +
+					  p_fs->num_FAT_sectors;
+
+	p_fs->root_start_sector = p_fs->FAT2_start_sector +
+				  p_fs->num_FAT_sectors;
+	p_fs->data_start_sector = p_fs->root_start_sector + num_root_sectors;
+
+	p_fs->num_sectors = GET16(p_bpb->num_sectors);
+	if (p_fs->num_sectors == 0)
+		p_fs->num_sectors = GET32(p_bpb->num_huge_sectors);
+
+	num_reserved = p_fs->data_start_sector - p_fs->PBR_sector;
+	p_fs->num_clusters = ((p_fs->num_sectors - num_reserved) >>
+			      p_fs->sectors_per_clu_bits) + 2;
+	/* because the cluster index starts with 2 */
+
+	if (p_fs->num_clusters < FAT12_THRESHOLD)
+		p_fs->vol_type = FAT12;
+	else
+		p_fs->vol_type = FAT16;
+	p_fs->vol_id = GET32(p_bpb->vol_serial);
+
+	p_fs->root_dir = 0;
+	p_fs->dentries_in_root = GET16(p_bpb->num_root_entries);
+	p_fs->dentries_per_clu = 1 << (p_fs->cluster_size_bits -
+				       DENTRY_SIZE_BITS);
+
+	p_fs->vol_flag = VOL_CLEAN;
+	p_fs->clu_srch_ptr = 2;
+	p_fs->used_clusters = (u32)~0;
+
+	p_fs->fs_func = &fat_fs_func;
+
+	return FFS_SUCCESS;
+}
+
+s32 fat32_mount(struct super_block *sb, struct pbr_sector_t *p_pbr)
+{
+	s32 num_reserved;
+	struct bpb32_t *p_bpb = (struct bpb32_t *)p_pbr->bpb;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+	struct bd_info_t *p_bd = &(EXFAT_SB(sb)->bd_info);
+
+	if (p_bpb->num_fats == 0)
+		return FFS_FORMATERR;
+
+	p_fs->sectors_per_clu = p_bpb->sectors_per_clu;
+	p_fs->sectors_per_clu_bits = ilog2(p_bpb->sectors_per_clu);
+	p_fs->cluster_size_bits = p_fs->sectors_per_clu_bits +
+				  p_bd->sector_size_bits;
+	p_fs->cluster_size = 1 << p_fs->cluster_size_bits;
+
+	p_fs->num_FAT_sectors = GET32(p_bpb->num_fat32_sectors);
+
+	p_fs->FAT1_start_sector = p_fs->PBR_sector + GET16(p_bpb->num_reserved);
+	if (p_bpb->num_fats == 1)
+		p_fs->FAT2_start_sector = p_fs->FAT1_start_sector;
+	else
+		p_fs->FAT2_start_sector = p_fs->FAT1_start_sector +
+					  p_fs->num_FAT_sectors;
+
+	p_fs->root_start_sector = p_fs->FAT2_start_sector +
+				  p_fs->num_FAT_sectors;
+	p_fs->data_start_sector = p_fs->root_start_sector;
+
+	p_fs->num_sectors = GET32(p_bpb->num_huge_sectors);
+	num_reserved = p_fs->data_start_sector - p_fs->PBR_sector;
+
+	p_fs->num_clusters = ((p_fs->num_sectors - num_reserved) >>
+			      p_fs->sectors_per_clu_bits) + 2;
+	/* because the cluster index starts with 2 */
+
+	p_fs->vol_type = FAT32;
+	p_fs->vol_id = GET32(p_bpb->vol_serial);
+
+	p_fs->root_dir = GET32(p_bpb->root_cluster);
+	p_fs->dentries_in_root = 0;
+	p_fs->dentries_per_clu = 1 << (p_fs->cluster_size_bits -
+				       DENTRY_SIZE_BITS);
+
+	p_fs->vol_flag = VOL_CLEAN;
+	p_fs->clu_srch_ptr = 2;
+	p_fs->used_clusters = (u32)~0;
+
+	p_fs->fs_func = &fat_fs_func;
+
+	return FFS_SUCCESS;
+}
+
+static struct fs_func exfat_fs_func = {
+	.alloc_cluster = exfat_alloc_cluster,
+	.free_cluster = exfat_free_cluster,
+	.count_used_clusters = exfat_count_used_clusters,
+
+	.init_dir_entry = exfat_init_dir_entry,
+	.init_ext_entry = exfat_init_ext_entry,
+	.find_dir_entry = exfat_find_dir_entry,
+	.delete_dir_entry = exfat_delete_dir_entry,
+	.get_uni_name_from_ext_entry = exfat_get_uni_name_from_ext_entry,
+	.count_ext_entries = exfat_count_ext_entries,
+	.calc_num_entries = exfat_calc_num_entries,
+
+	.get_entry_type = exfat_get_entry_type,
+	.set_entry_type = exfat_set_entry_type,
+	.get_entry_attr = exfat_get_entry_attr,
+	.set_entry_attr = exfat_set_entry_attr,
+	.get_entry_flag = exfat_get_entry_flag,
+	.set_entry_flag = exfat_set_entry_flag,
+	.get_entry_clu0 = exfat_get_entry_clu0,
+	.set_entry_clu0 = exfat_set_entry_clu0,
+	.get_entry_size = exfat_get_entry_size,
+	.set_entry_size = exfat_set_entry_size,
+	.get_entry_time = exfat_get_entry_time,
+	.set_entry_time = exfat_set_entry_time,
+};
+
+s32 exfat_mount(struct super_block *sb, struct pbr_sector_t *p_pbr)
+{
+	struct bpbex_t *p_bpb = (struct bpbex_t *)p_pbr->bpb;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+	struct bd_info_t *p_bd = &(EXFAT_SB(sb)->bd_info);
+
+	if (p_bpb->num_fats == 0)
+		return FFS_FORMATERR;
+
+	p_fs->sectors_per_clu = 1 << p_bpb->sectors_per_clu_bits;
+	p_fs->sectors_per_clu_bits = p_bpb->sectors_per_clu_bits;
+	p_fs->cluster_size_bits = p_fs->sectors_per_clu_bits +
+				  p_bd->sector_size_bits;
+	p_fs->cluster_size = 1 << p_fs->cluster_size_bits;
+
+	p_fs->num_FAT_sectors = GET32(p_bpb->fat_length);
+
+	p_fs->FAT1_start_sector = p_fs->PBR_sector + GET32(p_bpb->fat_offset);
+	if (p_bpb->num_fats == 1)
+		p_fs->FAT2_start_sector = p_fs->FAT1_start_sector;
+	else
+		p_fs->FAT2_start_sector = p_fs->FAT1_start_sector +
+					  p_fs->num_FAT_sectors;
+
+	p_fs->root_start_sector = p_fs->PBR_sector + GET32(p_bpb->clu_offset);
+	p_fs->data_start_sector = p_fs->root_start_sector;
+
+	p_fs->num_sectors = GET64(p_bpb->vol_length);
+	p_fs->num_clusters = GET32(p_bpb->clu_count) + 2;
+	/* because the cluster index starts with 2 */
+
+	p_fs->vol_type = EXFAT;
+	p_fs->vol_id = GET32(p_bpb->vol_serial);
+
+	p_fs->root_dir = GET32(p_bpb->root_cluster);
+	p_fs->dentries_in_root = 0;
+	p_fs->dentries_per_clu = 1 << (p_fs->cluster_size_bits -
+				       DENTRY_SIZE_BITS);
+
+	p_fs->vol_flag = (u32)GET16(p_bpb->vol_flags);
+	p_fs->clu_srch_ptr = 2;
+	p_fs->used_clusters = (u32)~0;
+
+	p_fs->fs_func = &exfat_fs_func;
+
+	return FFS_SUCCESS;
+}
+
+s32 create_dir(struct inode *inode, struct chain_t *p_dir,
+	       struct uni_name_t *p_uniname, struct file_id_t *fid)
+{
+	s32 ret, dentry, num_entries;
+	u64 size;
+	struct chain_t clu;
+	struct dos_name_t dos_name, dot_name;
+	struct super_block *sb = inode->i_sb;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+	struct fs_func *fs_func = p_fs->fs_func;
+
+	ret = get_num_entries_and_dos_name(sb, p_dir, p_uniname, &num_entries,
+					   &dos_name);
+	if (ret)
+		return ret;
+
+	/* find_empty_entry must be called before alloc_cluster */
+	dentry = find_empty_entry(inode, p_dir, num_entries);
+	if (dentry < 0)
+		return FFS_FULL;
+
+	clu.dir = CLUSTER_32(~0);
+	clu.size = 0;
+	clu.flags = (p_fs->vol_type == EXFAT) ? 0x03 : 0x01;
+
+	/* (1) allocate a cluster */
+	ret = fs_func->alloc_cluster(sb, 1, &clu);
+	if (ret < 0)
+		return FFS_MEDIAERR;
+	else if (ret == 0)
+		return FFS_FULL;
+
+	ret = clear_cluster(sb, clu.dir);
+	if (ret != FFS_SUCCESS)
+		return ret;
+
+	if (p_fs->vol_type == EXFAT) {
+		size = p_fs->cluster_size;
+	} else {
+		size = 0;
+
+		/* initialize the . and .. entry
+		 * Information for . points to itself
+		 * Information for .. points to parent dir
+		 */
+
+		dot_name.name_case = 0x0;
+		memcpy(dot_name.name, DOS_CUR_DIR_NAME, DOS_NAME_LENGTH);
+
+		ret = fs_func->init_dir_entry(sb, &clu, 0, TYPE_DIR, clu.dir,
+					      0);
+		if (ret != FFS_SUCCESS)
+			return ret;
+
+		ret = fs_func->init_ext_entry(sb, &clu, 0, 1, NULL, &dot_name);
+		if (ret != FFS_SUCCESS)
+			return ret;
+
+		memcpy(dot_name.name, DOS_PAR_DIR_NAME, DOS_NAME_LENGTH);
+
+		if (p_dir->dir == p_fs->root_dir)
+			ret = fs_func->init_dir_entry(sb, &clu, 1, TYPE_DIR,
+						      CLUSTER_32(0), 0);
+		else
+			ret = fs_func->init_dir_entry(sb, &clu, 1, TYPE_DIR,
+						      p_dir->dir, 0);
+
+		if (ret != FFS_SUCCESS)
+			return ret;
+
+		ret = p_fs->fs_func->init_ext_entry(sb, &clu, 1, 1, NULL,
+						    &dot_name);
+		if (ret != FFS_SUCCESS)
+			return ret;
+	}
+
+	/* (2) update the directory entry */
+	/* make sub-dir entry in parent directory */
+	ret = fs_func->init_dir_entry(sb, p_dir, dentry, TYPE_DIR, clu.dir,
+				      size);
+	if (ret != FFS_SUCCESS)
+		return ret;
+
+	ret = fs_func->init_ext_entry(sb, p_dir, dentry, num_entries, p_uniname,
+				      &dos_name);
+	if (ret != FFS_SUCCESS)
+		return ret;
+
+	fid->dir.dir = p_dir->dir;
+	fid->dir.size = p_dir->size;
+	fid->dir.flags = p_dir->flags;
+	fid->entry = dentry;
+
+	fid->attr = ATTR_SUBDIR;
+	fid->flags = (p_fs->vol_type == EXFAT) ? 0x03 : 0x01;
+	fid->size = size;
+	fid->start_clu = clu.dir;
+
+	fid->type = TYPE_DIR;
+	fid->rwoffset = 0;
+	fid->hint_last_off = -1;
+
+	return FFS_SUCCESS;
+}
+
+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;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+	struct fs_func *fs_func = p_fs->fs_func;
+
+	ret = get_num_entries_and_dos_name(sb, p_dir, p_uniname, &num_entries,
+					   &dos_name);
+	if (ret)
+		return ret;
+
+	/* find_empty_entry must be called before alloc_cluster() */
+	dentry = find_empty_entry(inode, p_dir, num_entries);
+	if (dentry < 0)
+		return FFS_FULL;
+
+	/* (1) update the directory entry */
+	/* fill the dos name directory entry information of the created file.
+	 * the first cluster is not determined yet. (0)
+	 */
+	ret = fs_func->init_dir_entry(sb, p_dir, dentry, TYPE_FILE | mode,
+				      CLUSTER_32(0), 0);
+	if (ret != FFS_SUCCESS)
+		return ret;
+
+	ret = fs_func->init_ext_entry(sb, p_dir, dentry, num_entries, p_uniname,
+				      &dos_name);
+	if (ret != FFS_SUCCESS)
+		return ret;
+
+	fid->dir.dir = p_dir->dir;
+	fid->dir.size = p_dir->size;
+	fid->dir.flags = p_dir->flags;
+	fid->entry = dentry;
+
+	fid->attr = ATTR_ARCHIVE | mode;
+	fid->flags = (p_fs->vol_type == EXFAT) ? 0x03 : 0x01;
+	fid->size = 0;
+	fid->start_clu = CLUSTER_32(~0);
+
+	fid->type = TYPE_FILE;
+	fid->rwoffset = 0;
+	fid->hint_last_off = -1;
+
+	return FFS_SUCCESS;
+}
+
+void remove_file(struct inode *inode, struct chain_t *p_dir, s32 entry)
+{
+	s32 num_entries;
+	sector_t sector;
+	struct dentry_t *ep;
+	struct super_block *sb = inode->i_sb;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+	struct fs_func *fs_func = p_fs->fs_func;
+
+	ep = get_entry_in_dir(sb, p_dir, entry, &sector);
+	if (!ep)
+		return;
+
+	buf_lock(sb, sector);
+
+	/* buf_lock() before call count_ext_entries() */
+	num_entries = fs_func->count_ext_entries(sb, p_dir, entry, ep);
+	if (num_entries < 0) {
+		buf_unlock(sb, sector);
+		return;
+	}
+	num_entries++;
+
+	buf_unlock(sb, sector);
+
+	/* (1) update the directory entry */
+	fs_func->delete_dir_entry(sb, p_dir, entry, 0, num_entries);
+}
+
+s32 rename_file(struct inode *inode, struct chain_t *p_dir, s32 oldentry,
+		struct uni_name_t *p_uniname, struct file_id_t *fid)
+{
+	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;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+	struct fs_func *fs_func = p_fs->fs_func;
+
+	epold = get_entry_in_dir(sb, p_dir, oldentry, &sector_old);
+	if (!epold)
+		return FFS_MEDIAERR;
+
+	buf_lock(sb, sector_old);
+
+	/* buf_lock() before call count_ext_entries() */
+	num_old_entries = fs_func->count_ext_entries(sb, p_dir, oldentry,
+						     epold);
+	if (num_old_entries < 0) {
+		buf_unlock(sb, sector_old);
+		return FFS_MEDIAERR;
+	}
+	num_old_entries++;
+
+	ret = get_num_entries_and_dos_name(sb, p_dir, p_uniname,
+					   &num_new_entries, &dos_name);
+	if (ret) {
+		buf_unlock(sb, sector_old);
+		return ret;
+	}
+
+	if (num_old_entries < num_new_entries) {
+		newentry = find_empty_entry(inode, p_dir, num_new_entries);
+		if (newentry < 0) {
+			buf_unlock(sb, sector_old);
+			return FFS_FULL;
+		}
+
+		epnew = get_entry_in_dir(sb, p_dir, newentry, &sector_new);
+		if (!epnew) {
+			buf_unlock(sb, sector_old);
+			return FFS_MEDIAERR;
+		}
+
+		memcpy((void *)epnew, (void *)epold, DENTRY_SIZE);
+		if (fs_func->get_entry_type(epnew) == TYPE_FILE) {
+			fs_func->set_entry_attr(epnew,
+						fs_func->get_entry_attr(epnew) |
+						ATTR_ARCHIVE);
+			fid->attr |= ATTR_ARCHIVE;
+		}
+		buf_modify(sb, sector_new);
+		buf_unlock(sb, sector_old);
+
+		if (p_fs->vol_type == EXFAT) {
+			epold = get_entry_in_dir(sb, p_dir, oldentry + 1,
+						 &sector_old);
+			buf_lock(sb, sector_old);
+			epnew = get_entry_in_dir(sb, p_dir, newentry + 1,
+						 &sector_new);
+
+			if (!epold || !epnew) {
+				buf_unlock(sb, sector_old);
+				return FFS_MEDIAERR;
+			}
+
+			memcpy((void *)epnew, (void *)epold, DENTRY_SIZE);
+			buf_modify(sb, sector_new);
+			buf_unlock(sb, sector_old);
+		}
+
+		ret = fs_func->init_ext_entry(sb, p_dir, newentry,
+					      num_new_entries, p_uniname,
+					      &dos_name);
+		if (ret != FFS_SUCCESS)
+			return ret;
+
+		fs_func->delete_dir_entry(sb, p_dir, oldentry, 0,
+					  num_old_entries);
+		fid->entry = newentry;
+	} else {
+		if (fs_func->get_entry_type(epold) == TYPE_FILE) {
+			fs_func->set_entry_attr(epold,
+						fs_func->get_entry_attr(epold) |
+						ATTR_ARCHIVE);
+			fid->attr |= ATTR_ARCHIVE;
+		}
+		buf_modify(sb, sector_old);
+		buf_unlock(sb, sector_old);
+
+		ret = fs_func->init_ext_entry(sb, p_dir, oldentry,
+					      num_new_entries, p_uniname,
+					      &dos_name);
+		if (ret != FFS_SUCCESS)
+			return ret;
+
+		fs_func->delete_dir_entry(sb, p_dir, oldentry, num_new_entries,
+					  num_old_entries);
+	}
+
+	return FFS_SUCCESS;
+}
+
+s32 move_file(struct inode *inode, struct chain_t *p_olddir, s32 oldentry,
+	      struct chain_t *p_newdir, struct uni_name_t *p_uniname,
+	      struct file_id_t *fid)
+{
+	s32 ret, newentry, num_new_entries, num_old_entries;
+	sector_t sector_mov, sector_new;
+	struct chain_t clu;
+	struct dos_name_t dos_name;
+	struct dentry_t *epmov, *epnew;
+	struct super_block *sb = inode->i_sb;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+	struct fs_func *fs_func = p_fs->fs_func;
+
+	epmov = get_entry_in_dir(sb, p_olddir, oldentry, &sector_mov);
+	if (!epmov)
+		return FFS_MEDIAERR;
+
+	/* check if the source and target directory is the same */
+	if (fs_func->get_entry_type(epmov) == TYPE_DIR &&
+	    fs_func->get_entry_clu0(epmov) == p_newdir->dir)
+		return FFS_INVALIDPATH;
+
+	buf_lock(sb, sector_mov);
+
+	/* buf_lock() before call count_ext_entries() */
+	num_old_entries = fs_func->count_ext_entries(sb, p_olddir, oldentry,
+						     epmov);
+	if (num_old_entries < 0) {
+		buf_unlock(sb, sector_mov);
+		return FFS_MEDIAERR;
+	}
+	num_old_entries++;
+
+	ret = get_num_entries_and_dos_name(sb, p_newdir, p_uniname,
+					   &num_new_entries, &dos_name);
+	if (ret) {
+		buf_unlock(sb, sector_mov);
+		return ret;
+	}
+
+	newentry = find_empty_entry(inode, p_newdir, num_new_entries);
+	if (newentry < 0) {
+		buf_unlock(sb, sector_mov);
+		return FFS_FULL;
+	}
+
+	epnew = get_entry_in_dir(sb, p_newdir, newentry, &sector_new);
+	if (!epnew) {
+		buf_unlock(sb, sector_mov);
+		return FFS_MEDIAERR;
+	}
+
+	memcpy((void *)epnew, (void *)epmov, DENTRY_SIZE);
+	if (fs_func->get_entry_type(epnew) == TYPE_FILE) {
+		fs_func->set_entry_attr(epnew, fs_func->get_entry_attr(epnew) |
+					ATTR_ARCHIVE);
+		fid->attr |= ATTR_ARCHIVE;
+	}
+	buf_modify(sb, sector_new);
+	buf_unlock(sb, sector_mov);
+
+	if (p_fs->vol_type == EXFAT) {
+		epmov = get_entry_in_dir(sb, p_olddir, oldentry + 1,
+					 &sector_mov);
+		buf_lock(sb, sector_mov);
+		epnew = get_entry_in_dir(sb, p_newdir, newentry + 1,
+					 &sector_new);
+		if (!epmov || !epnew) {
+			buf_unlock(sb, sector_mov);
+			return FFS_MEDIAERR;
+		}
+
+		memcpy((void *)epnew, (void *)epmov, DENTRY_SIZE);
+		buf_modify(sb, sector_new);
+		buf_unlock(sb, sector_mov);
+	} else if (fs_func->get_entry_type(epnew) == TYPE_DIR) {
+		/* change ".." pointer to new parent dir */
+		clu.dir = fs_func->get_entry_clu0(epnew);
+		clu.flags = 0x01;
+
+		epnew = get_entry_in_dir(sb, &clu, 1, &sector_new);
+		if (!epnew)
+			return FFS_MEDIAERR;
+
+		if (p_newdir->dir == p_fs->root_dir)
+			fs_func->set_entry_clu0(epnew, CLUSTER_32(0));
+		else
+			fs_func->set_entry_clu0(epnew, p_newdir->dir);
+		buf_modify(sb, sector_new);
+	}
+
+	ret = fs_func->init_ext_entry(sb, p_newdir, newentry, num_new_entries,
+				      p_uniname, &dos_name);
+	if (ret != FFS_SUCCESS)
+		return ret;
+
+	fs_func->delete_dir_entry(sb, p_olddir, oldentry, 0, num_old_entries);
+
+	fid->dir.dir = p_newdir->dir;
+	fid->dir.size = p_newdir->size;
+	fid->dir.flags = p_newdir->flags;
+
+	fid->entry = newentry;
+
+	return FFS_SUCCESS;
+}
+
+/*
+ *  Sector Read/Write Functions
+ */
+
+int sector_read(struct super_block *sb, sector_t sec, struct buffer_head **bh,
+		bool read)
+{
+	s32 ret = FFS_MEDIAERR;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+
+	if ((sec >= (p_fs->PBR_sector + p_fs->num_sectors)) &&
+	    (p_fs->num_sectors > 0)) {
+		pr_err("[EXFAT] %s: out of range error! (sec = %llu)\n",
+		       __func__, (unsigned long long)sec);
+		fs_error(sb);
+		return ret;
+	}
+
+	if (!p_fs->dev_ejected) {
+		ret = bdev_read(sb, sec, bh, 1, read);
+		if (ret != FFS_SUCCESS)
+			p_fs->dev_ejected = TRUE;
+	}
+
+	return ret;
+}
+
+int sector_write(struct super_block *sb, sector_t sec, struct buffer_head *bh,
+		 bool sync)
+{
+	s32 ret = FFS_MEDIAERR;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+
+	if (sec >= (p_fs->PBR_sector + p_fs->num_sectors) &&
+	    (p_fs->num_sectors > 0)) {
+		pr_err("[EXFAT] %s: out of range error! (sec = %llu)\n",
+		       __func__, (unsigned long long)sec);
+		fs_error(sb);
+		return ret;
+	}
+
+	if (!bh) {
+		pr_err("[EXFAT] %s: bh is NULL!\n", __func__);
+		fs_error(sb);
+		return ret;
+	}
+
+	if (!p_fs->dev_ejected) {
+		ret = bdev_write(sb, sec, bh, 1, sync);
+		if (ret != FFS_SUCCESS)
+			p_fs->dev_ejected = TRUE;
+	}
+
+	return ret;
+}
+
+int multi_sector_read(struct super_block *sb, sector_t sec,
+		      struct buffer_head **bh, s32 num_secs, bool read)
+{
+	s32 ret = FFS_MEDIAERR;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+
+	if (((sec + num_secs) > (p_fs->PBR_sector + p_fs->num_sectors)) &&
+	    (p_fs->num_sectors > 0)) {
+		pr_err("[EXFAT] %s: out of range error! (sec = %llu, num_secs = %d)\n",
+		       __func__, (unsigned long long)sec, num_secs);
+		fs_error(sb);
+		return ret;
+	}
+
+	if (!p_fs->dev_ejected) {
+		ret = bdev_read(sb, sec, bh, num_secs, read);
+		if (ret != FFS_SUCCESS)
+			p_fs->dev_ejected = TRUE;
+	}
+
+	return ret;
+}
+
+int multi_sector_write(struct super_block *sb, sector_t sec,
+		       struct buffer_head *bh, s32 num_secs, bool sync)
+{
+	s32 ret = FFS_MEDIAERR;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+
+	if ((sec + num_secs) > (p_fs->PBR_sector + p_fs->num_sectors) &&
+	    (p_fs->num_sectors > 0)) {
+		pr_err("[EXFAT] %s: out of range error! (sec = %llu, num_secs = %d)\n",
+		       __func__, (unsigned long long)sec, num_secs);
+		fs_error(sb);
+		return ret;
+	}
+	if (!bh) {
+		pr_err("[EXFAT] %s: bh is NULL!\n", __func__);
+		fs_error(sb);
+		return ret;
+	}
+
+	if (!p_fs->dev_ejected) {
+		ret = bdev_write(sb, sec, bh, num_secs, sync);
+		if (ret != FFS_SUCCESS)
+			p_fs->dev_ejected = TRUE;
+	}
+
+	return ret;
+}
diff --git a/drivers/staging/exfat/exfat_nls.c b/drivers/staging/exfat/exfat_nls.c
new file mode 100644
index 000000000000..2ca58616159b
--- /dev/null
+++ b/drivers/staging/exfat/exfat_nls.c
@@ -0,0 +1,404 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *  Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
+ */
+
+#include <linux/string.h>
+#include <linux/nls.h>
+#include "exfat.h"
+
+static u16 bad_dos_chars[] = {
+	/* + , ; = [ ] */
+	0x002B, 0x002C, 0x003B, 0x003D, 0x005B, 0x005D,
+	0xFF0B, 0xFF0C, 0xFF1B, 0xFF1D, 0xFF3B, 0xFF3D,
+	0
+};
+
+static u16 bad_uni_chars[] = {
+	/* " * / : < > ? \ | */
+	0x0022,         0x002A, 0x002F, 0x003A,
+	0x003C, 0x003E, 0x003F, 0x005C, 0x007C,
+	0
+};
+
+static int convert_ch_to_uni(struct nls_table *nls, u16 *uni, u8 *ch,
+			     bool *lossy)
+{
+	int len;
+
+	*uni = 0x0;
+
+	if (ch[0] < 0x80) {
+		*uni = (u16)ch[0];
+		return 1;
+	}
+
+	len = nls->char2uni(ch, NLS_MAX_CHARSET_SIZE, uni);
+	if (len < 0) {
+		/* conversion failed */
+		pr_info("%s: fail to use nls\n", __func__);
+		if (lossy)
+			*lossy = true;
+		*uni = (u16)'_';
+		if (!strcmp(nls->charset, "utf8"))
+			return 1;
+		else
+			return 2;
+	}
+
+	return len;
+}
+
+static int convert_uni_to_ch(struct nls_table *nls, u8 *ch, u16 uni,
+			     bool *lossy)
+{
+	int len;
+
+	ch[0] = 0x0;
+
+	if (uni < 0x0080) {
+		ch[0] = (u8)uni;
+		return 1;
+	}
+
+	len = nls->uni2char(uni, ch, NLS_MAX_CHARSET_SIZE);
+	if (len < 0) {
+		/* conversion failed */
+		pr_info("%s: fail to use nls\n", __func__);
+		if (lossy)
+			*lossy = true;
+		ch[0] = '_';
+		return 1;
+	}
+
+	return len;
+}
+
+u16 nls_upper(struct super_block *sb, u16 a)
+{
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+
+	if (EXFAT_SB(sb)->options.casesensitive)
+		return a;
+	if (p_fs->vol_utbl && p_fs->vol_utbl[get_col_index(a)])
+		return p_fs->vol_utbl[get_col_index(a)][get_row_index(a)];
+	else
+		return a;
+}
+
+static u16 *nls_wstrchr(u16 *str, u16 wchar)
+{
+	while (*str) {
+		if (*(str++) == wchar)
+			return str;
+	}
+
+	return NULL;
+}
+
+int nls_dosname_cmp(struct super_block *sb, u8 *a, u8 *b)
+{
+	return strncmp(a, b, DOS_NAME_LENGTH);
+}
+
+int nls_uniname_cmp(struct super_block *sb, u16 *a, u16 *b)
+{
+	int i;
+
+	for (i = 0; i < MAX_NAME_LENGTH; i++, a++, b++) {
+		if (nls_upper(sb, *a) != nls_upper(sb, *b))
+			return 1;
+		if (*a == 0x0)
+			return 0;
+	}
+	return 0;
+}
+
+void nls_uniname_to_dosname(struct super_block *sb,
+			    struct dos_name_t *p_dosname,
+			    struct uni_name_t *p_uniname, bool *p_lossy)
+{
+	int i, j, len;
+	bool lossy = false;
+	u8 buf[MAX_CHARSET_SIZE];
+	u8 lower = 0, upper = 0;
+	u8 *dosname = p_dosname->name;
+	u16 *uniname = p_uniname->name;
+	u16 *p, *last_period;
+	struct nls_table *nls = EXFAT_SB(sb)->nls_disk;
+
+	for (i = 0; i < DOS_NAME_LENGTH; i++)
+		*(dosname + i) = ' ';
+
+	if (!nls_uniname_cmp(sb, uniname, (u16 *)UNI_CUR_DIR_NAME)) {
+		*(dosname) = '.';
+		p_dosname->name_case = 0x0;
+		if (p_lossy)
+			*p_lossy = false;
+		return;
+	}
+
+	if (!nls_uniname_cmp(sb, uniname, (u16 *)UNI_PAR_DIR_NAME)) {
+		*(dosname) = '.';
+		*(dosname + 1) = '.';
+		p_dosname->name_case = 0x0;
+		if (p_lossy)
+			*p_lossy = false;
+		return;
+	}
+
+	/* search for the last embedded period */
+	last_period = NULL;
+	for (p = uniname; *p; p++) {
+		if (*p == (u16)'.')
+			last_period = p;
+	}
+
+	i = 0;
+	while (i < DOS_NAME_LENGTH) {
+		if (i == 8) {
+			if (!last_period)
+				break;
+
+			if (uniname <= last_period) {
+				if (uniname < last_period)
+					lossy = true;
+				uniname = last_period + 1;
+			}
+		}
+
+		if (*uniname == (u16)'\0') {
+			break;
+		} else if (*uniname == (u16)' ') {
+			lossy = true;
+		} else if (*uniname == (u16)'.') {
+			if (uniname < last_period)
+				lossy = true;
+			else
+				i = 8;
+		} else if (nls_wstrchr(bad_dos_chars, *uniname)) {
+			lossy = true;
+			*(dosname + i) = '_';
+			i++;
+		} else {
+			len = convert_uni_to_ch(nls, buf, *uniname, &lossy);
+
+			if (len > 1) {
+				if ((i >= 8) && ((i + len) > DOS_NAME_LENGTH))
+					break;
+
+				if ((i < 8) && ((i + len) > 8)) {
+					i = 8;
+					continue;
+				}
+
+				lower = 0xFF;
+
+				for (j = 0; j < len; j++, i++)
+					*(dosname + i) = *(buf + j);
+			} else { /* len == 1 */
+				if ((*buf >= 'a') && (*buf <= 'z')) {
+					*(dosname + i) = *buf - ('a' - 'A');
+
+					if (i < 8)
+						lower |= 0x08;
+					else
+						lower |= 0x10;
+				} else if ((*buf >= 'A') && (*buf <= 'Z')) {
+					*(dosname + i) = *buf;
+
+					if (i < 8)
+						upper |= 0x08;
+					else
+						upper |= 0x10;
+				} else {
+					*(dosname + i) = *buf;
+				}
+				i++;
+			}
+		}
+
+		uniname++;
+	}
+
+	if (*dosname == 0xE5)
+		*dosname = 0x05;
+
+	if (*uniname != 0x0)
+		lossy = TRUE;
+
+	if (upper & lower)
+		p_dosname->name_case = 0xFF;
+	else
+		p_dosname->name_case = lower;
+
+	if (p_lossy)
+		*p_lossy = lossy;
+}
+
+void nls_dosname_to_uniname(struct super_block *sb,
+			    struct uni_name_t *p_uniname,
+			    struct dos_name_t *p_dosname)
+{
+	int i = 0, j, n = 0;
+	u8 buf[DOS_NAME_LENGTH + 2];
+	u8 *dosname = p_dosname->name;
+	u16 *uniname = p_uniname->name;
+	struct nls_table *nls = EXFAT_SB(sb)->nls_disk;
+
+	if (*dosname == 0x05) {
+		*buf = 0xE5;
+		i++;
+		n++;
+	}
+
+	for (; i < 8; i++, n++) {
+		if (*(dosname + i) == ' ')
+			break;
+
+		if ((*(dosname + i) >= 'A') && (*(dosname + i) <= 'Z') &&
+		    (p_dosname->name_case & 0x08))
+			*(buf + n) = *(dosname + i) + ('a' - 'A');
+		else
+			*(buf + n) = *(dosname + i);
+	}
+	if (*(dosname + 8) != ' ') {
+		*(buf + n) = '.';
+		n++;
+	}
+
+	for (i = 8; i < DOS_NAME_LENGTH; i++, n++) {
+		if (*(dosname + i) == ' ')
+			break;
+
+		if ((*(dosname + i) >= 'A') && (*(dosname + i) <= 'Z') &&
+		    (p_dosname->name_case & 0x10))
+			*(buf + n) = *(dosname + i) + ('a' - 'A');
+		else
+			*(buf + n) = *(dosname + i);
+	}
+	*(buf + n) = '\0';
+
+	i = 0;
+	j = 0;
+	while (j < (MAX_NAME_LENGTH - 1)) {
+		if (*(buf + i) == '\0')
+			break;
+
+		i += convert_ch_to_uni(nls, uniname, (buf + i), NULL);
+
+		uniname++;
+		j++;
+	}
+
+	*uniname = (u16)'\0';
+}
+
+void nls_uniname_to_cstring(struct super_block *sb, u8 *p_cstring,
+			    struct uni_name_t *p_uniname)
+{
+	int i, j, len;
+	u8 buf[MAX_CHARSET_SIZE];
+	u16 *uniname = p_uniname->name;
+	struct nls_table *nls = EXFAT_SB(sb)->nls_io;
+
+	if (!nls) {
+		len = utf16s_to_utf8s(uniname, MAX_NAME_LENGTH,
+				      UTF16_HOST_ENDIAN, p_cstring,
+				      MAX_NAME_LENGTH);
+		p_cstring[len] = 0;
+		return;
+	}
+
+	i = 0;
+	while (i < (MAX_NAME_LENGTH - 1)) {
+		if (*uniname == (u16)'\0')
+			break;
+
+		len = convert_uni_to_ch(nls, buf, *uniname, NULL);
+
+		if (len > 1) {
+			for (j = 0; j < len; j++)
+				*p_cstring++ = (char)*(buf + j);
+		} else { /* len == 1 */
+			*p_cstring++ = (char)*buf;
+		}
+
+		uniname++;
+		i++;
+	}
+
+	*p_cstring = '\0';
+}
+
+void nls_cstring_to_uniname(struct super_block *sb,
+			    struct uni_name_t *p_uniname, u8 *p_cstring,
+			    bool *p_lossy)
+{
+	int i, j;
+	bool lossy = false;
+	u8 *end_of_name;
+	u8 upname[MAX_NAME_LENGTH * 2];
+	u16 *uniname = p_uniname->name;
+	struct nls_table *nls = EXFAT_SB(sb)->nls_io;
+
+	/* strip all trailing spaces */
+	end_of_name = p_cstring + strlen(p_cstring);
+
+	while (*(--end_of_name) == ' ') {
+		if (end_of_name < p_cstring)
+			break;
+	}
+	*(++end_of_name) = '\0';
+
+	if (strcmp(p_cstring, ".") && strcmp(p_cstring, "..")) {
+		/* strip all trailing periods */
+		while (*(--end_of_name) == '.') {
+			if (end_of_name < p_cstring)
+				break;
+		}
+		*(++end_of_name) = '\0';
+	}
+
+	if (*p_cstring == '\0')
+		lossy = true;
+
+	if (!nls) {
+		i = utf8s_to_utf16s(p_cstring, MAX_NAME_LENGTH,
+				    UTF16_HOST_ENDIAN, uniname,
+				    MAX_NAME_LENGTH);
+		for (j = 0; j < i; j++)
+			SET16_A(upname + j * 2, nls_upper(sb, uniname[j]));
+		uniname[i] = '\0';
+	} else {
+		i = 0;
+		j = 0;
+		while (j < (MAX_NAME_LENGTH - 1)) {
+			if (*(p_cstring + i) == '\0')
+				break;
+
+			i += convert_ch_to_uni(nls, uniname,
+					       (u8 *)(p_cstring + i), &lossy);
+
+			if ((*uniname < 0x0020) ||
+			    nls_wstrchr(bad_uni_chars, *uniname))
+				lossy = true;
+
+			SET16_A(upname + j * 2, nls_upper(sb, *uniname));
+
+			uniname++;
+			j++;
+		}
+
+		if (*(p_cstring + i) != '\0')
+			lossy = true;
+		*uniname = (u16)'\0';
+	}
+
+	p_uniname->name_len = j;
+	p_uniname->name_hash = calc_checksum_2byte(upname, j << 1, 0,
+						   CS_DEFAULT);
+
+	if (p_lossy)
+		*p_lossy = lossy;
+}
diff --git a/drivers/staging/exfat/exfat_super.c b/drivers/staging/exfat/exfat_super.c
new file mode 100644
index 000000000000..5b5c2ca8c9aa
--- /dev/null
+++ b/drivers/staging/exfat/exfat_super.c
@@ -0,0 +1,4137 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *  Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
+ */
+
+#include <linux/version.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/time.h>
+#include <linux/slab.h>
+#include <linux/seq_file.h>
+#include <linux/pagemap.h>
+#include <linux/mpage.h>
+#include <linux/buffer_head.h>
+#include <linux/exportfs.h>
+#include <linux/mount.h>
+#include <linux/vfs.h>
+#include <linux/aio.h>
+#include <linux/iversion.h>
+#include <linux/parser.h>
+#include <linux/uio.h>
+#include <linux/writeback.h>
+#include <linux/log2.h>
+#include <linux/hash.h>
+#include <linux/backing-dev.h>
+#include <linux/sched.h>
+#include <linux/fs_struct.h>
+#include <linux/namei.h>
+#include <linux/time.h>
+
+#include <linux/string.h>
+#include <linux/nls.h>
+#include <linux/mutex.h>
+#include <linux/swap.h>
+
+#define EXFAT_VERSION  "1.3.0"
+
+#include "exfat.h"
+
+static struct kmem_cache *exfat_inode_cachep;
+
+// FIXME use commented lines
+// static int exfat_default_codepage = CONFIG_EXFAT_DEFAULT_CODEPAGE;
+// static char exfat_default_iocharset[] = CONFIG_EXFAT_DEFAULT_IOCHARSET;
+static int exfat_default_codepage = CONFIG_FAT_DEFAULT_CODEPAGE;
+static char exfat_default_iocharset[] = CONFIG_FAT_DEFAULT_IOCHARSET;
+
+#define INC_IVERSION(x) (inode_inc_iversion(x))
+#define GET_IVERSION(x) (inode_peek_iversion_raw(x))
+#define SET_IVERSION(x, y) (inode_set_iversion(x, y))
+
+static struct inode *exfat_iget(struct super_block *sb, loff_t i_pos);
+static int exfat_sync_inode(struct inode *inode);
+static struct inode *exfat_build_inode(struct super_block *sb,
+				       struct file_id_t *fid, loff_t i_pos);
+static int exfat_write_inode(struct inode *inode,
+			     struct writeback_control *wbc);
+static void exfat_write_super(struct super_block *sb);
+
+#define UNIX_SECS_1980    315532800L
+
+#if BITS_PER_LONG == 64
+#define UNIX_SECS_2108    4354819200L
+#endif
+
+/* days between 1.1.70 and 1.1.80 (2 leap days) */
+#define DAYS_DELTA_DECADE    (365 * 10 + 2)
+/* 120 (2100 - 1980) isn't leap year */
+#define NO_LEAP_YEAR_2100    (120)
+#define IS_LEAP_YEAR(y)    (!((y) & 0x3) && (y) != NO_LEAP_YEAR_2100)
+
+#define SECS_PER_MIN    (60)
+#define SECS_PER_HOUR   (60 * SECS_PER_MIN)
+#define SECS_PER_DAY    (24 * SECS_PER_HOUR)
+
+#define MAKE_LEAP_YEAR(leap_year, year)                         \
+	do {                                                    \
+		if (unlikely(year > NO_LEAP_YEAR_2100))         \
+			leap_year = ((year + 3) / 4) - 1;       \
+		else                                            \
+			leap_year = ((year + 3) / 4);           \
+	} while (0)
+
+/* Linear day numbers of the respective 1sts in non-leap years. */
+static time_t accum_days_in_year[] = {
+	/* Jan  Feb  Mar  Apr  May  Jun  Jul  Aug  Sep  Oct  Nov  Dec */
+	0,   0,  31,  59,  90, 120, 151, 181, 212, 243, 273, 304, 334, 0, 0, 0,
+};
+
+/* Convert a FAT time/date pair to a UNIX date (seconds since 1 1 70). */
+static void exfat_time_fat2unix(struct exfat_sb_info *sbi,
+				struct timespec64 *ts, struct date_time_t *tp)
+{
+	time_t year = tp->Year;
+	time_t ld;
+
+	MAKE_LEAP_YEAR(ld, year);
+
+	if (IS_LEAP_YEAR(year) && (tp->Month) > 2)
+		ld++;
+
+	ts->tv_sec = tp->Second +
+		     tp->Minute * SECS_PER_MIN +
+		     tp->Hour * SECS_PER_HOUR +
+		     (ld + accum_days_in_year[(tp->Month)] +
+		      (tp->Day - 1)) * SECS_PER_DAY +
+		     (year * 365 + DAYS_DELTA_DECADE) * SECS_PER_DAY +
+		     sys_tz.tz_minuteswest * SECS_PER_MIN;
+
+	ts->tv_nsec = 0;
+}
+
+/* Convert linear UNIX date to a FAT time/date pair. */
+static void exfat_time_unix2fat(struct exfat_sb_info *sbi,
+				struct timespec64 *ts, struct date_time_t *tp)
+{
+	time_t second = ts->tv_sec;
+	time_t day, month, year;
+	time_t ld;
+
+	second -= sys_tz.tz_minuteswest * SECS_PER_MIN;
+
+	/* Jan 1 GMT 00:00:00 1980. But what about another time zone? */
+	if (second < UNIX_SECS_1980) {
+		tp->Second  = 0;
+		tp->Minute  = 0;
+		tp->Hour = 0;
+		tp->Day  = 1;
+		tp->Month  = 1;
+		tp->Year = 0;
+		return;
+	}
+#if (BITS_PER_LONG == 64)
+	if (second >= UNIX_SECS_2108) {
+		tp->Second  = 59;
+		tp->Minute  = 59;
+		tp->Hour = 23;
+		tp->Day  = 31;
+		tp->Month  = 12;
+		tp->Year = 127;
+		return;
+	}
+#endif
+	day = second / SECS_PER_DAY - DAYS_DELTA_DECADE;
+	year = day / 365;
+	MAKE_LEAP_YEAR(ld, year);
+	if (year * 365 + ld > day)
+		year--;
+
+	MAKE_LEAP_YEAR(ld, year);
+	day -= year * 365 + ld;
+
+	if (IS_LEAP_YEAR(year) && day == accum_days_in_year[3]) {
+		month = 2;
+	} else {
+		if (IS_LEAP_YEAR(year) && day > accum_days_in_year[3])
+			day--;
+		for (month = 1; month < 12; month++) {
+			if (accum_days_in_year[month + 1] > day)
+				break;
+		}
+	}
+	day -= accum_days_in_year[month];
+
+	tp->Second  = second % SECS_PER_MIN;
+	tp->Minute  = (second / SECS_PER_MIN) % 60;
+	tp->Hour = (second / SECS_PER_HOUR) % 24;
+	tp->Day  = day + 1;
+	tp->Month  = month;
+	tp->Year = year;
+}
+
+struct timestamp_t *tm_current(struct timestamp_t *tp)
+{
+	struct timespec64 ts;
+	time_t second, day, leap_day, month, year;
+
+	ktime_get_real_ts64(&ts);
+
+	second = ts.tv_sec;
+	second -= sys_tz.tz_minuteswest * SECS_PER_MIN;
+
+	/* Jan 1 GMT 00:00:00 1980. But what about another time zone? */
+	if (second < UNIX_SECS_1980) {
+		tp->sec  = 0;
+		tp->min  = 0;
+		tp->hour = 0;
+		tp->day  = 1;
+		tp->mon  = 1;
+		tp->year = 0;
+		return tp;
+	}
+#if BITS_PER_LONG == 64
+	if (second >= UNIX_SECS_2108) {
+		tp->sec  = 59;
+		tp->min  = 59;
+		tp->hour = 23;
+		tp->day  = 31;
+		tp->mon  = 12;
+		tp->year = 127;
+		return tp;
+	}
+#endif
+
+	day = second / SECS_PER_DAY - DAYS_DELTA_DECADE;
+	year = day / 365;
+
+	MAKE_LEAP_YEAR(leap_day, year);
+	if (year * 365 + leap_day > day)
+		year--;
+
+	MAKE_LEAP_YEAR(leap_day, year);
+
+	day -= year * 365 + leap_day;
+
+	if (IS_LEAP_YEAR(year) && day == accum_days_in_year[3]) {
+		month = 2;
+	} else {
+		if (IS_LEAP_YEAR(year) && day > accum_days_in_year[3])
+			day--;
+		for (month = 1; month < 12; month++) {
+			if (accum_days_in_year[month + 1] > day)
+				break;
+		}
+	}
+	day -= accum_days_in_year[month];
+
+	tp->sec  = second % SECS_PER_MIN;
+	tp->min  = (second / SECS_PER_MIN) % 60;
+	tp->hour = (second / SECS_PER_HOUR) % 24;
+	tp->day  = day + 1;
+	tp->mon  = month;
+	tp->year = year;
+
+	return tp;
+}
+
+static void __lock_super(struct super_block *sb)
+{
+	struct exfat_sb_info *sbi = EXFAT_SB(sb);
+
+	mutex_lock(&sbi->s_lock);
+}
+
+static void __unlock_super(struct super_block *sb)
+{
+	struct exfat_sb_info *sbi = EXFAT_SB(sb);
+
+	mutex_unlock(&sbi->s_lock);
+}
+
+static int __is_sb_dirty(struct super_block *sb)
+{
+	struct exfat_sb_info *sbi = EXFAT_SB(sb);
+
+	return sbi->s_dirt;
+}
+
+static void __set_sb_clean(struct super_block *sb)
+{
+	struct exfat_sb_info *sbi = EXFAT_SB(sb);
+
+	sbi->s_dirt = 0;
+}
+
+static int __exfat_revalidate(struct dentry *dentry)
+{
+	return 0;
+}
+
+static int exfat_revalidate(struct dentry *dentry, unsigned int flags)
+{
+	if (flags & LOOKUP_RCU)
+		return -ECHILD;
+
+	if (dentry->d_inode)
+		return 1;
+	return __exfat_revalidate(dentry);
+}
+
+static int exfat_revalidate_ci(struct dentry *dentry, unsigned int flags)
+{
+	if (flags & LOOKUP_RCU)
+		return -ECHILD;
+
+	if (dentry->d_inode)
+		return 1;
+
+	if (!flags)
+		return 0;
+
+	if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
+		return 0;
+
+	return __exfat_revalidate(dentry);
+}
+
+static unsigned int __exfat_striptail_len(unsigned int len, const char *name)
+{
+	while (len && name[len - 1] == '.')
+		len--;
+	return len;
+}
+
+static unsigned int exfat_striptail_len(const struct qstr *qstr)
+{
+	return __exfat_striptail_len(qstr->len, qstr->name);
+}
+
+static int exfat_d_hash(const struct dentry *dentry, struct qstr *qstr)
+{
+	qstr->hash = full_name_hash(dentry, qstr->name,
+				    exfat_striptail_len(qstr));
+	return 0;
+}
+
+static int exfat_d_hashi(const struct dentry *dentry, struct qstr *qstr)
+{
+	struct super_block *sb = dentry->d_sb;
+	const unsigned char *name;
+	unsigned int len;
+	unsigned long hash;
+
+	name = qstr->name;
+	len = exfat_striptail_len(qstr);
+
+	hash = init_name_hash(dentry);
+	while (len--)
+		hash = partial_name_hash(nls_upper(sb, *name++), hash);
+	qstr->hash = end_name_hash(hash);
+
+	return 0;
+}
+
+static int exfat_cmpi(const struct dentry *dentry, unsigned int len,
+		      const char *str, const struct qstr *name)
+{
+	struct nls_table *t = EXFAT_SB(dentry->d_sb)->nls_io;
+	unsigned int alen, blen;
+
+	alen = exfat_striptail_len(name);
+	blen = __exfat_striptail_len(len, str);
+	if (alen == blen) {
+		if (t == NULL) {
+			if (strncasecmp(name->name, str, alen) == 0)
+				return 0;
+		} else if (nls_strnicmp(t, name->name, str, alen) == 0)
+			return 0;
+	}
+	return 1;
+}
+
+static int exfat_cmp(const struct dentry *dentry, unsigned int len,
+		     const char *str, const struct qstr *name)
+{
+	unsigned int alen, blen;
+
+	alen = exfat_striptail_len(name);
+	blen = __exfat_striptail_len(len, str);
+	if (alen == blen) {
+		if (strncmp(name->name, str, alen) == 0)
+			return 0;
+	}
+	return 1;
+}
+
+static const struct dentry_operations exfat_ci_dentry_ops = {
+	.d_revalidate   = exfat_revalidate_ci,
+	.d_hash         = exfat_d_hashi,
+	.d_compare      = exfat_cmpi,
+};
+
+static const struct dentry_operations exfat_dentry_ops = {
+	.d_revalidate   = exfat_revalidate,
+	.d_hash         = exfat_d_hash,
+	.d_compare      = exfat_cmp,
+};
+
+static DEFINE_SEMAPHORE(z_sem);
+
+static inline void fs_sync(struct super_block *sb, bool do_sync)
+{
+	if (do_sync)
+		bdev_sync(sb);
+}
+
+/*
+ * If ->i_mode can't hold S_IWUGO (i.e. ATTR_RO), we use ->i_attrs to
+ * save ATTR_RO instead of ->i_mode.
+ *
+ * If it's directory and !sbi->options.rodir, ATTR_RO isn't read-only
+ * bit, it's just used as flag for app.
+ */
+static inline int exfat_mode_can_hold_ro(struct inode *inode)
+{
+	struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);
+
+	if (S_ISDIR(inode->i_mode))
+		return 0;
+
+	if ((~sbi->options.fs_fmask) & 0222)
+		return 1;
+	return 0;
+}
+
+/* Convert attribute bits and a mask to the UNIX mode. */
+static inline mode_t exfat_make_mode(struct exfat_sb_info *sbi, u32 attr,
+				     mode_t mode)
+{
+	if ((attr & ATTR_READONLY) && !(attr & ATTR_SUBDIR))
+		mode &= ~0222;
+
+	if (attr & ATTR_SUBDIR)
+		return (mode & ~sbi->options.fs_dmask) | S_IFDIR;
+	else if (attr & ATTR_SYMLINK)
+		return (mode & ~sbi->options.fs_dmask) | S_IFLNK;
+	else
+		return (mode & ~sbi->options.fs_fmask) | S_IFREG;
+}
+
+/* Return the FAT attribute byte for this inode */
+static inline u32 exfat_make_attr(struct inode *inode)
+{
+	if (exfat_mode_can_hold_ro(inode) && !(inode->i_mode & 0222))
+		return (EXFAT_I(inode)->fid.attr) | ATTR_READONLY;
+	else
+		return EXFAT_I(inode)->fid.attr;
+}
+
+static inline void exfat_save_attr(struct inode *inode, u32 attr)
+{
+	if (exfat_mode_can_hold_ro(inode))
+		EXFAT_I(inode)->fid.attr = attr & ATTR_RWMASK;
+	else
+		EXFAT_I(inode)->fid.attr = attr & (ATTR_RWMASK | ATTR_READONLY);
+}
+
+static int ffsMountVol(struct super_block *sb)
+{
+	int i, ret;
+	struct pbr_sector_t *p_pbr;
+	struct buffer_head *tmp_bh = NULL;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+	struct bd_info_t *p_bd = &(EXFAT_SB(sb)->bd_info);
+
+	pr_info("[EXFAT] trying to mount...\n");
+
+	down(&z_sem);
+
+	buf_init(sb);
+
+	sema_init(&p_fs->v_sem, 1);
+	p_fs->dev_ejected = FALSE;
+
+	/* open the block device */
+	bdev_open(sb);
+
+	if (p_bd->sector_size < sb->s_blocksize) {
+		ret = FFS_MEDIAERR;
+		goto out;
+	}
+	if (p_bd->sector_size > sb->s_blocksize)
+		sb_set_blocksize(sb, p_bd->sector_size);
+
+	/* read Sector 0 */
+	if (sector_read(sb, 0, &tmp_bh, 1) != FFS_SUCCESS) {
+		ret = FFS_MEDIAERR;
+		goto out;
+	}
+
+	p_fs->PBR_sector = 0;
+
+	p_pbr = (struct pbr_sector_t *) tmp_bh->b_data;
+
+	/* check the validity of PBR */
+	if (GET16_A(p_pbr->signature) != PBR_SIGNATURE) {
+		brelse(tmp_bh);
+		bdev_close(sb);
+		ret = FFS_FORMATERR;
+		goto out;
+	}
+
+	/* fill fs_stuct */
+	for (i = 0; i < 53; i++)
+		if (p_pbr->bpb[i])
+			break;
+
+	if (i < 53) {
+		if (GET16(p_pbr->bpb + 11)) /* num_fat_sectors */
+			ret = fat16_mount(sb, p_pbr);
+		else
+			ret = fat32_mount(sb, p_pbr);
+	} else {
+		ret = exfat_mount(sb, p_pbr);
+	}
+
+	brelse(tmp_bh);
+
+	if (ret) {
+		bdev_close(sb);
+		goto out;
+	}
+
+	if (p_fs->vol_type == EXFAT) {
+		ret = load_alloc_bitmap(sb);
+		if (ret) {
+			bdev_close(sb);
+			goto out;
+		}
+		ret = load_upcase_table(sb);
+		if (ret) {
+			free_alloc_bitmap(sb);
+			bdev_close(sb);
+			goto out;
+		}
+	}
+
+	if (p_fs->dev_ejected) {
+		if (p_fs->vol_type == EXFAT) {
+			free_upcase_table(sb);
+			free_alloc_bitmap(sb);
+		}
+		bdev_close(sb);
+		ret = FFS_MEDIAERR;
+		goto out;
+	}
+
+	pr_info("[EXFAT] mounted successfully\n");
+
+out:
+	up(&z_sem);
+
+	return ret;
+}
+
+static int ffsUmountVol(struct super_block *sb)
+{
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+	int err = FFS_SUCCESS;
+
+	pr_info("[EXFAT] trying to unmount...\n");
+
+	down(&z_sem);
+
+	/* acquire the lock for file system critical section */
+	down(&p_fs->v_sem);
+
+	fs_sync(sb, false);
+	fs_set_vol_flags(sb, VOL_CLEAN);
+
+	if (p_fs->vol_type == EXFAT) {
+		free_upcase_table(sb);
+		free_alloc_bitmap(sb);
+	}
+
+	FAT_release_all(sb);
+	buf_release_all(sb);
+
+	/* close the block device */
+	bdev_close(sb);
+
+	if (p_fs->dev_ejected) {
+		pr_info("[EXFAT] unmounted with media errors. Device is already ejected.\n");
+		err = FFS_MEDIAERR;
+	}
+
+	buf_shutdown(sb);
+
+	/* release the lock for file system critical section */
+	up(&p_fs->v_sem);
+	up(&z_sem);
+
+	pr_info("[EXFAT] unmounted successfully\n");
+
+	return err;
+}
+
+static int ffsGetVolInfo(struct super_block *sb, struct vol_info_t *info)
+{
+	int err = FFS_SUCCESS;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+
+	/* check the validity of pointer parameters */
+	if (info == NULL)
+		return FFS_ERROR;
+
+	/* acquire the lock for file system critical section */
+	down(&p_fs->v_sem);
+
+	if (p_fs->used_clusters == (u32) ~0)
+		p_fs->used_clusters = p_fs->fs_func->count_used_clusters(sb);
+
+	info->FatType = p_fs->vol_type;
+	info->ClusterSize = p_fs->cluster_size;
+	info->NumClusters = p_fs->num_clusters - 2; /* clu 0 & 1 */
+	info->UsedClusters = p_fs->used_clusters;
+	info->FreeClusters = info->NumClusters - info->UsedClusters;
+
+	if (p_fs->dev_ejected)
+		err = FFS_MEDIAERR;
+
+	/* release the lock for file system critical section */
+	up(&p_fs->v_sem);
+
+	return err;
+}
+
+static int ffsSyncVol(struct super_block *sb, bool do_sync)
+{
+	int err = FFS_SUCCESS;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+
+	/* acquire the lock for file system critical section */
+	down(&p_fs->v_sem);
+
+	/* synchronize the file system */
+	fs_sync(sb, do_sync);
+	fs_set_vol_flags(sb, VOL_CLEAN);
+
+	if (p_fs->dev_ejected)
+		err = FFS_MEDIAERR;
+
+	/* release the lock for file system critical section */
+	up(&p_fs->v_sem);
+
+	return err;
+}
+
+/*----------------------------------------------------------------------*/
+/*  File Operation Functions                                            */
+/*----------------------------------------------------------------------*/
+
+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;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+
+	pr_debug("%s entered\n", __func__);
+
+	/* check the validity of pointer parameters */
+	if ((fid == NULL) || (path == NULL) || (*path == '\0'))
+		return FFS_ERROR;
+
+	/* acquire the lock for file system critical section */
+	down(&p_fs->v_sem);
+
+	/* check the validity of directory name in the given pathname */
+	ret = resolve_path(inode, path, &dir, &uni_name);
+	if (ret)
+		goto out;
+
+	ret = get_num_entries_and_dos_name(sb, &dir, &uni_name, &num_entries,
+					   &dos_name);
+	if (ret)
+		goto out;
+
+	/* search the file name for directories */
+	dentry = p_fs->fs_func->find_dir_entry(sb, &dir, &uni_name, num_entries,
+					       &dos_name, TYPE_ALL);
+	if (dentry < -1) {
+		return FFS_NOTFOUND;
+		goto out;
+	}
+
+	fid->dir.dir = dir.dir;
+	fid->dir.size = dir.size;
+	fid->dir.flags = dir.flags;
+	fid->entry = dentry;
+
+	if (dentry == -1) {
+		fid->type = TYPE_DIR;
+		fid->rwoffset = 0;
+		fid->hint_last_off = -1;
+
+		fid->attr = ATTR_SUBDIR;
+		fid->flags = 0x01;
+		fid->size = 0;
+		fid->start_clu = p_fs->root_dir;
+	} else {
+		if (p_fs->vol_type == EXFAT) {
+			es = get_entry_set_in_dir(sb, &dir, dentry,
+						  ES_2_ENTRIES, &ep);
+			if (!es) {
+				ret =  FFS_MEDIAERR;
+				goto out;
+			}
+			ep2 = ep+1;
+		} else {
+			ep = get_entry_in_dir(sb, &dir, dentry, NULL);
+			if (!ep) {
+				ret =  FFS_MEDIAERR;
+				goto out;
+			}
+			ep2 = ep;
+		}
+
+		fid->type = p_fs->fs_func->get_entry_type(ep);
+		fid->rwoffset = 0;
+		fid->hint_last_off = -1;
+		fid->attr = p_fs->fs_func->get_entry_attr(ep);
+
+		fid->size = p_fs->fs_func->get_entry_size(ep2);
+		if ((fid->type == TYPE_FILE) && (fid->size == 0)) {
+			fid->flags = (p_fs->vol_type == EXFAT) ? 0x03 : 0x01;
+			fid->start_clu = CLUSTER_32(~0);
+		} else {
+			fid->flags = p_fs->fs_func->get_entry_flag(ep2);
+			fid->start_clu = p_fs->fs_func->get_entry_clu0(ep2);
+		}
+
+		if (p_fs->vol_type == EXFAT)
+			release_entry_set(es);
+	}
+
+	if (p_fs->dev_ejected)
+		ret = FFS_MEDIAERR;
+out:
+	/* release the lock for file system critical section */
+	up(&p_fs->v_sem);
+
+	return ret;
+}
+
+static int ffsCreateFile(struct inode *inode, char *path, u8 mode,
+			 struct file_id_t *fid)
+{
+	struct chain_t dir;
+	struct uni_name_t uni_name;
+	struct super_block *sb = inode->i_sb;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+	int ret;
+
+	/* check the validity of pointer parameters */
+	if ((fid == NULL) || (path == NULL) || (*path == '\0'))
+		return FFS_ERROR;
+
+	/* acquire the lock for file system critical section */
+	down(&p_fs->v_sem);
+
+	/* check the validity of directory name in the given pathname */
+	ret = resolve_path(inode, path, &dir, &uni_name);
+	if (ret)
+		goto out;
+
+	fs_set_vol_flags(sb, VOL_DIRTY);
+
+	/* create a new file */
+	ret = create_file(inode, &dir, &uni_name, mode, fid);
+
+#ifdef CONFIG_EXFAT_DELAYED_SYNC
+	fs_sync(sb, false);
+	fs_set_vol_flags(sb, VOL_CLEAN);
+#endif
+
+	if (p_fs->dev_ejected)
+		ret = FFS_MEDIAERR;
+
+out:
+	/* release the lock for file system critical section */
+	up(&p_fs->v_sem);
+
+	return ret;
+}
+
+static int ffsReadFile(struct inode *inode, struct file_id_t *fid, void *buffer,
+		       u64 count, u64 *rcount)
+{
+	s32 offset, sec_offset, clu_offset;
+	u32 clu;
+	int ret;
+	sector_t LogSector;
+	u64 oneblkread, read_bytes;
+	struct buffer_head *tmp_bh = NULL;
+	struct super_block *sb = inode->i_sb;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+	struct bd_info_t *p_bd = &(EXFAT_SB(sb)->bd_info);
+
+	/* check the validity of the given file id */
+	if (fid == NULL)
+		return FFS_INVALIDFID;
+
+	/* check the validity of pointer parameters */
+	if (buffer == NULL)
+		return FFS_ERROR;
+
+	/* acquire the lock for file system critical section */
+	down(&p_fs->v_sem);
+
+	/* check if the given file ID is opened */
+	if (fid->type != TYPE_FILE) {
+		ret = FFS_PERMISSIONERR;
+		goto out;
+	}
+
+	if (fid->rwoffset > fid->size)
+		fid->rwoffset = fid->size;
+
+	if (count > (fid->size - fid->rwoffset))
+		count = fid->size - fid->rwoffset;
+
+	if (count == 0) {
+		if (rcount != NULL)
+			*rcount = 0;
+		ret = FFS_EOF;
+		goto out;
+	}
+
+	read_bytes = 0;
+
+	while (count > 0) {
+		clu_offset = (s32)(fid->rwoffset >> p_fs->cluster_size_bits);
+		clu = fid->start_clu;
+
+		if (fid->flags == 0x03) {
+			clu += clu_offset;
+		} else {
+			/* hint information */
+			if ((clu_offset > 0) && (fid->hint_last_off > 0) &&
+			    (clu_offset >= fid->hint_last_off)) {
+				clu_offset -= fid->hint_last_off;
+				clu = fid->hint_last_clu;
+			}
+
+			while (clu_offset > 0) {
+				/* clu = FAT_read(sb, clu); */
+				if (FAT_read(sb, clu, &clu) == -1)
+					return FFS_MEDIAERR;
+
+				clu_offset--;
+			}
+		}
+
+		/* hint information */
+		fid->hint_last_off = (s32)(fid->rwoffset >>
+					   p_fs->cluster_size_bits);
+		fid->hint_last_clu = clu;
+
+		/* byte offset in cluster */
+		offset = (s32)(fid->rwoffset & (p_fs->cluster_size-1));
+
+		/* sector offset in cluster */
+		sec_offset = offset >> p_bd->sector_size_bits;
+
+		/* byte offset in sector */
+		offset &= p_bd->sector_size_mask;
+
+		LogSector = START_SECTOR(clu) + sec_offset;
+
+		oneblkread = (u64)(p_bd->sector_size - offset);
+		if (oneblkread > count)
+			oneblkread = count;
+
+		if ((offset == 0) && (oneblkread == p_bd->sector_size)) {
+			if (sector_read(sb, LogSector, &tmp_bh, 1) !=
+			    FFS_SUCCESS)
+				goto err_out;
+			memcpy((char *)buffer + read_bytes,
+			       (char *)tmp_bh->b_data, (s32)oneblkread);
+		} else {
+			if (sector_read(sb, LogSector, &tmp_bh, 1) !=
+			    FFS_SUCCESS)
+				goto err_out;
+			memcpy((char *)buffer + read_bytes,
+			       (char *)tmp_bh->b_data + offset,
+			       (s32)oneblkread);
+		}
+		count -= oneblkread;
+		read_bytes += oneblkread;
+		fid->rwoffset += oneblkread;
+	}
+	brelse(tmp_bh);
+
+/* How did this ever work and not leak a brlse()?? */
+err_out:
+	/* set the size of read bytes */
+	if (rcount != NULL)
+		*rcount = read_bytes;
+
+	if (p_fs->dev_ejected)
+		ret = FFS_MEDIAERR;
+
+out:
+	/* release the lock for file system critical section */
+	up(&p_fs->v_sem);
+
+	return ret;
+}
+
+static int ffsWriteFile(struct inode *inode, struct file_id_t *fid,
+			void *buffer, u64 count, u64 *wcount)
+{
+	s32 modified = FALSE, offset, sec_offset, clu_offset;
+	s32 num_clusters, num_alloc, num_alloced = (s32) ~0;
+	int ret = 0;
+	u32 clu, last_clu;
+	sector_t LogSector, sector = 0;
+	u64 oneblkwrite, write_bytes;
+	struct chain_t new_clu;
+	struct timestamp_t tm;
+	struct dentry_t *ep, *ep2;
+	struct entry_set_cache_t *es = NULL;
+	struct buffer_head *tmp_bh = NULL;
+	struct super_block *sb = inode->i_sb;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+	struct bd_info_t *p_bd = &(EXFAT_SB(sb)->bd_info);
+
+	/* check the validity of the given file id */
+	if (fid == NULL)
+		return FFS_INVALIDFID;
+
+	/* check the validity of pointer parameters */
+	if (buffer == NULL)
+		return FFS_ERROR;
+
+	/* acquire the lock for file system critical section */
+	down(&p_fs->v_sem);
+
+	/* check if the given file ID is opened */
+	if (fid->type != TYPE_FILE) {
+		ret = FFS_PERMISSIONERR;
+		goto out;
+	}
+
+	if (fid->rwoffset > fid->size)
+		fid->rwoffset = fid->size;
+
+	if (count == 0) {
+		if (wcount != NULL)
+			*wcount = 0;
+		ret = FFS_SUCCESS;
+		goto out;
+	}
+
+	fs_set_vol_flags(sb, VOL_DIRTY);
+
+	if (fid->size == 0)
+		num_clusters = 0;
+	else
+		num_clusters = (s32)((fid->size-1) >>
+				     p_fs->cluster_size_bits) + 1;
+
+	write_bytes = 0;
+
+	while (count > 0) {
+		clu_offset = (s32)(fid->rwoffset >> p_fs->cluster_size_bits);
+		clu = last_clu = fid->start_clu;
+
+		if (fid->flags == 0x03) {
+			if ((clu_offset > 0) && (clu != CLUSTER_32(~0))) {
+				last_clu += clu_offset - 1;
+
+				if (clu_offset == num_clusters)
+					clu = CLUSTER_32(~0);
+				else
+					clu += clu_offset;
+			}
+		} else {
+			/* hint information */
+			if ((clu_offset > 0) && (fid->hint_last_off > 0) &&
+			    (clu_offset >= fid->hint_last_off)) {
+				clu_offset -= fid->hint_last_off;
+				clu = fid->hint_last_clu;
+			}
+
+			while ((clu_offset > 0) && (clu != CLUSTER_32(~0))) {
+				last_clu = clu;
+				/* clu = FAT_read(sb, clu); */
+				if (FAT_read(sb, clu, &clu) == -1) {
+					ret = FFS_MEDIAERR;
+					goto out;
+				}
+				clu_offset--;
+			}
+		}
+
+		if (clu == CLUSTER_32(~0)) {
+			num_alloc = (s32)((count - 1) >>
+					  p_fs->cluster_size_bits) + 1;
+			new_clu.dir = (last_clu == CLUSTER_32(~0)) ?
+					CLUSTER_32(~0) : last_clu+1;
+			new_clu.size = 0;
+			new_clu.flags = fid->flags;
+
+			/* (1) allocate a chain of clusters */
+			num_alloced = p_fs->fs_func->alloc_cluster(sb,
+								   num_alloc,
+								   &new_clu);
+			if (num_alloced == 0)
+				break;
+			else if (num_alloced < 0) {
+				ret = FFS_MEDIAERR;
+				goto out;
+			}
+
+			/* (2) append to the FAT chain */
+			if (last_clu == CLUSTER_32(~0)) {
+				if (new_clu.flags == 0x01)
+					fid->flags = 0x01;
+				fid->start_clu = new_clu.dir;
+				modified = TRUE;
+			} else {
+				if (new_clu.flags != fid->flags) {
+					exfat_chain_cont_cluster(sb,
+								 fid->start_clu,
+								 num_clusters);
+					fid->flags = 0x01;
+					modified = TRUE;
+				}
+				if (new_clu.flags == 0x01)
+					FAT_write(sb, last_clu, new_clu.dir);
+			}
+
+			num_clusters += num_alloced;
+			clu = new_clu.dir;
+		}
+
+		/* hint information */
+		fid->hint_last_off = (s32)(fid->rwoffset >>
+					   p_fs->cluster_size_bits);
+		fid->hint_last_clu = clu;
+
+		/* byte offset in cluster   */
+		offset = (s32)(fid->rwoffset & (p_fs->cluster_size - 1));
+
+		/* sector offset in cluster */
+		sec_offset = offset >> p_bd->sector_size_bits;
+
+		/* byte offset in sector    */
+		offset &= p_bd->sector_size_mask;
+
+		LogSector = START_SECTOR(clu) + sec_offset;
+
+		oneblkwrite = (u64)(p_bd->sector_size - offset);
+		if (oneblkwrite > count)
+			oneblkwrite = count;
+
+		if ((offset == 0) && (oneblkwrite == p_bd->sector_size)) {
+			if (sector_read(sb, LogSector, &tmp_bh, 0) !=
+			    FFS_SUCCESS)
+				goto err_out;
+			memcpy((char *)tmp_bh->b_data,
+			       (char *)buffer + write_bytes, (s32)oneblkwrite);
+			if (sector_write(sb, LogSector, tmp_bh, 0) !=
+			    FFS_SUCCESS) {
+				brelse(tmp_bh);
+				goto err_out;
+			}
+		} else {
+			if ((offset > 0) ||
+			    ((fid->rwoffset+oneblkwrite) < fid->size)) {
+				if (sector_read(sb, LogSector, &tmp_bh, 1) !=
+				    FFS_SUCCESS)
+					goto err_out;
+			} else {
+				if (sector_read(sb, LogSector, &tmp_bh, 0) !=
+				    FFS_SUCCESS)
+					goto err_out;
+			}
+
+			memcpy((char *)tmp_bh->b_data + offset,
+			       (char *)buffer + write_bytes, (s32)oneblkwrite);
+			if (sector_write(sb, LogSector, tmp_bh, 0) !=
+			    FFS_SUCCESS) {
+				brelse(tmp_bh);
+				goto err_out;
+			}
+		}
+
+		count -= oneblkwrite;
+		write_bytes += oneblkwrite;
+		fid->rwoffset += oneblkwrite;
+
+		fid->attr |= ATTR_ARCHIVE;
+
+		if (fid->size < fid->rwoffset) {
+			fid->size = fid->rwoffset;
+			modified = TRUE;
+		}
+	}
+
+	brelse(tmp_bh);
+
+	/* (3) update the direcoty entry */
+	if (p_fs->vol_type == EXFAT) {
+		es = get_entry_set_in_dir(sb, &(fid->dir), fid->entry,
+					  ES_ALL_ENTRIES, &ep);
+		if (es == NULL)
+			goto err_out;
+		ep2 = ep+1;
+	} else {
+		ep = get_entry_in_dir(sb, &(fid->dir), fid->entry, &sector);
+		if (!ep)
+			goto err_out;
+		ep2 = ep;
+	}
+
+	p_fs->fs_func->set_entry_time(ep, tm_current(&tm), TM_MODIFY);
+	p_fs->fs_func->set_entry_attr(ep, fid->attr);
+
+	if (p_fs->vol_type != EXFAT)
+		buf_modify(sb, sector);
+
+	if (modified) {
+		if (p_fs->fs_func->get_entry_flag(ep2) != fid->flags)
+			p_fs->fs_func->set_entry_flag(ep2, fid->flags);
+
+		if (p_fs->fs_func->get_entry_size(ep2) != fid->size)
+			p_fs->fs_func->set_entry_size(ep2, fid->size);
+
+		if (p_fs->fs_func->get_entry_clu0(ep2) != fid->start_clu)
+			p_fs->fs_func->set_entry_clu0(ep2, fid->start_clu);
+
+		if (p_fs->vol_type != EXFAT)
+			buf_modify(sb, sector);
+	}
+
+	if (p_fs->vol_type == EXFAT) {
+		update_dir_checksum_with_entry_set(sb, es);
+		release_entry_set(es);
+	}
+
+#ifdef CONFIG_EXFAT_DELAYED_SYNC
+	fs_sync(sb, false);
+	fs_set_vol_flags(sb, VOL_CLEAN);
+#endif
+
+err_out:
+	/* set the size of written bytes */
+	if (wcount != NULL)
+		*wcount = write_bytes;
+
+	if (num_alloced == 0)
+		ret = FFS_FULL;
+
+	else if (p_fs->dev_ejected)
+		ret = FFS_MEDIAERR;
+
+out:
+	/* release the lock for file system critical section */
+	up(&p_fs->v_sem);
+
+	return ret;
+}
+
+static int ffsTruncateFile(struct inode *inode, u64 old_size, u64 new_size)
+{
+	s32 num_clusters;
+	u32 last_clu = CLUSTER_32(0);
+	int ret = 0;
+	sector_t sector = 0;
+	struct chain_t clu;
+	struct timestamp_t tm;
+	struct dentry_t *ep, *ep2;
+	struct super_block *sb = inode->i_sb;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+	struct file_id_t *fid = &(EXFAT_I(inode)->fid);
+	struct entry_set_cache_t *es = NULL;
+
+	pr_debug("%s entered (inode %p size %llu)\n", __func__, inode,
+		 new_size);
+
+	/* acquire the lock for file system critical section */
+	down(&p_fs->v_sem);
+
+	/* check if the given file ID is opened */
+	if (fid->type != TYPE_FILE) {
+		ret = FFS_PERMISSIONERR;
+		goto out;
+	}
+
+	if (fid->size != old_size) {
+		pr_err("[EXFAT] truncate : can't skip it because of size-mismatch(old:%lld->fid:%lld).\n",
+		       old_size, fid->size);
+	}
+
+	if (old_size <= new_size) {
+		ret = FFS_SUCCESS;
+		goto out;
+	}
+
+	fs_set_vol_flags(sb, VOL_DIRTY);
+
+	clu.dir = fid->start_clu;
+	clu.size = (s32)((old_size-1) >> p_fs->cluster_size_bits) + 1;
+	clu.flags = fid->flags;
+
+	if (new_size > 0) {
+		num_clusters = (s32)((new_size-1) >>
+				     p_fs->cluster_size_bits) + 1;
+
+		if (clu.flags == 0x03) {
+			clu.dir += num_clusters;
+		} else {
+			while (num_clusters > 0) {
+				last_clu = clu.dir;
+				if (FAT_read(sb, clu.dir, &clu.dir) == -1)
+					return FFS_MEDIAERR;
+				num_clusters--;
+			}
+		}
+
+		clu.size -= num_clusters;
+	}
+
+	fid->size = new_size;
+	fid->attr |= ATTR_ARCHIVE;
+	if (new_size == 0) {
+		fid->flags = (p_fs->vol_type == EXFAT) ? 0x03 : 0x01;
+		fid->start_clu = CLUSTER_32(~0);
+	}
+
+	/* (1) update the directory entry */
+	if (p_fs->vol_type == EXFAT) {
+		es = get_entry_set_in_dir(sb, &fid->dir, fid->entry,
+					  ES_ALL_ENTRIES, &ep);
+		if (es == NULL) {
+			ret = FFS_MEDIAERR;
+			goto out;
+			}
+		ep2 = ep+1;
+	} else {
+		ep = get_entry_in_dir(sb, &(fid->dir), fid->entry, &sector);
+		if (!ep) {
+			ret = FFS_MEDIAERR;
+			goto out;
+		}
+		ep2 = ep;
+	}
+
+	p_fs->fs_func->set_entry_time(ep, tm_current(&tm), TM_MODIFY);
+	p_fs->fs_func->set_entry_attr(ep, fid->attr);
+
+	p_fs->fs_func->set_entry_size(ep2, new_size);
+	if (new_size == 0) {
+		p_fs->fs_func->set_entry_flag(ep2, 0x01);
+		p_fs->fs_func->set_entry_clu0(ep2, CLUSTER_32(0));
+	}
+
+	if (p_fs->vol_type != EXFAT)
+		buf_modify(sb, sector);
+	else {
+		update_dir_checksum_with_entry_set(sb, es);
+		release_entry_set(es);
+	}
+
+	/* (2) cut off from the FAT chain */
+	if (last_clu != CLUSTER_32(0)) {
+		if (fid->flags == 0x01)
+			FAT_write(sb, last_clu, CLUSTER_32(~0));
+	}
+
+	/* (3) free the clusters */
+	p_fs->fs_func->free_cluster(sb, &clu, 0);
+
+	/* hint information */
+	fid->hint_last_off = -1;
+	if (fid->rwoffset > fid->size)
+		fid->rwoffset = fid->size;
+
+#ifdef CONFIG_EXFAT_DELAYED_SYNC
+	fs_sync(sb, false);
+	fs_set_vol_flags(sb, VOL_CLEAN);
+#endif
+
+	if (p_fs->dev_ejected)
+		ret = FFS_MEDIAERR;
+
+out:
+	pr_debug("%s exited (%d)\n", __func__, ret);
+	/* release the lock for file system critical section */
+	up(&p_fs->v_sem);
+
+	return ret;
+}
+
+static void update_parent_info(struct file_id_t *fid,
+			       struct inode *parent_inode)
+{
+	struct fs_info_t *p_fs = &(EXFAT_SB(parent_inode->i_sb)->fs_info);
+	struct file_id_t *parent_fid = &(EXFAT_I(parent_inode)->fid);
+
+	if (unlikely((parent_fid->flags != fid->dir.flags) ||
+		     (parent_fid->size !=
+		      (fid->dir.size << p_fs->cluster_size_bits)) ||
+		     (parent_fid->start_clu != fid->dir.dir))) {
+		fid->dir.dir = parent_fid->start_clu;
+		fid->dir.flags = parent_fid->flags;
+		fid->dir.size = ((parent_fid->size + (p_fs->cluster_size-1))
+						>> p_fs->cluster_size_bits);
+	}
+}
+
+static int ffsMoveFile(struct inode *old_parent_inode, struct file_id_t *fid,
+		       struct inode *new_parent_inode, struct dentry *new_dentry)
+{
+	s32 ret;
+	s32 dentry;
+	struct chain_t olddir, newdir;
+	struct chain_t *p_dir = NULL;
+	struct uni_name_t uni_name;
+	struct dentry_t *ep;
+	struct super_block *sb = old_parent_inode->i_sb;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+	u8 *new_path = (u8 *) new_dentry->d_name.name;
+	struct inode *new_inode = new_dentry->d_inode;
+	int num_entries;
+	struct file_id_t *new_fid = NULL;
+	s32 new_entry = 0;
+
+	/* check the validity of the given file id */
+	if (fid == NULL)
+		return FFS_INVALIDFID;
+
+	/* check the validity of pointer parameters */
+	if ((new_path == NULL) || (*new_path == '\0'))
+		return FFS_ERROR;
+
+	/* acquire the lock for file system critical section */
+	down(&p_fs->v_sem);
+
+	update_parent_info(fid, old_parent_inode);
+
+	olddir.dir = fid->dir.dir;
+	olddir.size = fid->dir.size;
+	olddir.flags = fid->dir.flags;
+
+	dentry = fid->entry;
+
+	/* check if the old file is "." or ".." */
+	if (p_fs->vol_type != EXFAT) {
+		if ((olddir.dir != p_fs->root_dir) && (dentry < 2)) {
+			ret = FFS_PERMISSIONERR;
+			goto out2;
+		}
+	}
+
+	ep = get_entry_in_dir(sb, &olddir, dentry, NULL);
+	if (!ep) {
+		ret = FFS_MEDIAERR;
+		goto out2;
+	}
+
+	if (p_fs->fs_func->get_entry_attr(ep) & ATTR_READONLY) {
+		ret = FFS_PERMISSIONERR;
+		goto out2;
+	}
+
+	/* check whether new dir is existing directory and empty */
+	if (new_inode) {
+		u32 entry_type;
+
+		ret = FFS_MEDIAERR;
+		new_fid = &EXFAT_I(new_inode)->fid;
+
+		update_parent_info(new_fid, new_parent_inode);
+
+		p_dir = &(new_fid->dir);
+		new_entry = new_fid->entry;
+		ep = get_entry_in_dir(sb, p_dir, new_entry, NULL);
+		if (!ep)
+			goto out;
+
+		entry_type = p_fs->fs_func->get_entry_type(ep);
+
+		if (entry_type == TYPE_DIR) {
+			struct chain_t new_clu;
+
+			new_clu.dir = new_fid->start_clu;
+			new_clu.size = (s32)((new_fid->size - 1) >>
+					     p_fs->cluster_size_bits) + 1;
+			new_clu.flags = new_fid->flags;
+
+			if (!is_dir_empty(sb, &new_clu)) {
+				ret = FFS_FILEEXIST;
+				goto out;
+			}
+		}
+	}
+
+	/* check the validity of directory name in the given new pathname */
+	ret = resolve_path(new_parent_inode, new_path, &newdir, &uni_name);
+	if (ret)
+		goto out2;
+
+	fs_set_vol_flags(sb, VOL_DIRTY);
+
+	if (olddir.dir == newdir.dir)
+		ret = rename_file(new_parent_inode, &olddir, dentry, &uni_name,
+				  fid);
+	else
+		ret = move_file(new_parent_inode, &olddir, dentry, &newdir,
+				&uni_name, fid);
+
+	if ((ret == FFS_SUCCESS) && new_inode) {
+		/* delete entries of new_dir */
+		ep = get_entry_in_dir(sb, p_dir, new_entry, NULL);
+		if (!ep)
+			goto out;
+
+		num_entries = p_fs->fs_func->count_ext_entries(sb, p_dir,
+							       new_entry, ep);
+		if (num_entries < 0)
+			goto out;
+		p_fs->fs_func->delete_dir_entry(sb, p_dir, new_entry, 0,
+						num_entries+1);
+	}
+out:
+#ifdef CONFIG_EXFAT_DELAYED_SYNC
+	fs_sync(sb, false);
+	fs_set_vol_flags(sb, VOL_CLEAN);
+#endif
+
+	if (p_fs->dev_ejected)
+		ret = FFS_MEDIAERR;
+out2:
+	/* release the lock for file system critical section */
+	up(&p_fs->v_sem);
+
+	return ret;
+}
+
+static int ffsRemoveFile(struct inode *inode, struct file_id_t *fid)
+{
+	s32 dentry;
+	int ret = FFS_SUCCESS;
+	struct chain_t dir, clu_to_free;
+	struct dentry_t *ep;
+	struct super_block *sb = inode->i_sb;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+
+	/* check the validity of the given file id */
+	if (fid == NULL)
+		return FFS_INVALIDFID;
+
+	/* acquire the lock for file system critical section */
+	down(&p_fs->v_sem);
+
+	dir.dir = fid->dir.dir;
+	dir.size = fid->dir.size;
+	dir.flags = fid->dir.flags;
+
+	dentry = fid->entry;
+
+	ep = get_entry_in_dir(sb, &dir, dentry, NULL);
+	if (!ep) {
+		ret = FFS_MEDIAERR;
+		goto out;
+	}
+
+	if (p_fs->fs_func->get_entry_attr(ep) & ATTR_READONLY) {
+		ret = FFS_PERMISSIONERR;
+		goto out;
+	}
+	fs_set_vol_flags(sb, VOL_DIRTY);
+
+	/* (1) update the directory entry */
+	remove_file(inode, &dir, dentry);
+
+	clu_to_free.dir = fid->start_clu;
+	clu_to_free.size = (s32)((fid->size-1) >> p_fs->cluster_size_bits) + 1;
+	clu_to_free.flags = fid->flags;
+
+	/* (2) free the clusters */
+	p_fs->fs_func->free_cluster(sb, &clu_to_free, 0);
+
+	fid->size = 0;
+	fid->start_clu = CLUSTER_32(~0);
+	fid->flags = (p_fs->vol_type == EXFAT) ? 0x03 : 0x01;
+
+#ifdef CONFIG_EXFAT_DELAYED_SYNC
+	fs_sync(sb, false);
+	fs_set_vol_flags(sb, VOL_CLEAN);
+#endif
+
+	if (p_fs->dev_ejected)
+		ret = FFS_MEDIAERR;
+out:
+	/* release the lock for file system critical section */
+	up(&p_fs->v_sem);
+
+	return ret;
+}
+
+#if 0
+/* Not currently wired up */
+static int ffsSetAttr(struct inode *inode, u32 attr)
+{
+	u32 type;
+	int ret = FFS_SUCCESS;
+	sector_t sector = 0;
+	struct dentry_t *ep;
+	struct super_block *sb = inode->i_sb;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+	struct file_id_t *fid = &(EXFAT_I(inode)->fid);
+	u8 is_dir = (fid->type == TYPE_DIR) ? 1 : 0;
+	struct entry_set_cache_t *es = NULL;
+
+	if (fid->attr == attr) {
+		if (p_fs->dev_ejected)
+			return FFS_MEDIAERR;
+		return FFS_SUCCESS;
+	}
+
+	if (is_dir) {
+		if ((fid->dir.dir == p_fs->root_dir) &&
+		    (fid->entry == -1)) {
+			if (p_fs->dev_ejected)
+				return FFS_MEDIAERR;
+			return FFS_SUCCESS;
+		}
+	}
+
+	/* acquire the lock for file system critical section */
+	down(&p_fs->v_sem);
+
+	/* get the directory entry of given file */
+	if (p_fs->vol_type == EXFAT) {
+		es = get_entry_set_in_dir(sb, &(fid->dir), fid->entry,
+					  ES_ALL_ENTRIES, &ep);
+		if (es == NULL) {
+			ret = FFS_MEDIAERR;
+			goto out;
+		}
+	} else {
+		ep = get_entry_in_dir(sb, &(fid->dir), fid->entry, &sector);
+		if (!ep) {
+			ret = FFS_MEDIAERR;
+			goto out;
+		}
+	}
+
+	type = p_fs->fs_func->get_entry_type(ep);
+
+	if (((type == TYPE_FILE) && (attr & ATTR_SUBDIR)) ||
+	    ((type == TYPE_DIR) && (!(attr & ATTR_SUBDIR)))) {
+		if (p_fs->dev_ejected)
+			ret = FFS_MEDIAERR;
+		else
+			ret = FFS_ERROR;
+
+		if (p_fs->vol_type == EXFAT)
+			release_entry_set(es);
+		goto out;
+	}
+
+	fs_set_vol_flags(sb, VOL_DIRTY);
+
+	/* set the file attribute */
+	fid->attr = attr;
+	p_fs->fs_func->set_entry_attr(ep, attr);
+
+	if (p_fs->vol_type != EXFAT)
+		buf_modify(sb, sector);
+	else {
+		update_dir_checksum_with_entry_set(sb, es);
+		release_entry_set(es);
+	}
+
+#ifdef CONFIG_EXFAT_DELAYED_SYNC
+	fs_sync(sb, false);
+	fs_set_vol_flags(sb, VOL_CLEAN);
+#endif
+
+	if (p_fs->dev_ejected)
+		ret = FFS_MEDIAERR;
+out:
+	/* release the lock for file system critical section */
+	up(&p_fs->v_sem);
+
+	return ret;
+}
+#endif
+
+static int ffsReadStat(struct inode *inode, struct dir_entry_t *info)
+{
+	sector_t sector = 0;
+	s32 count;
+	int ret = FFS_SUCCESS;
+	struct chain_t dir;
+	struct uni_name_t uni_name;
+	struct timestamp_t tm;
+	struct dentry_t *ep, *ep2;
+	struct super_block *sb = inode->i_sb;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+	struct file_id_t *fid = &(EXFAT_I(inode)->fid);
+	struct entry_set_cache_t *es = NULL;
+	u8 is_dir = (fid->type == TYPE_DIR) ? 1 : 0;
+
+	pr_debug("%s entered\n", __func__);
+
+	/* acquire the lock for file system critical section */
+	down(&p_fs->v_sem);
+
+	if (is_dir) {
+		if ((fid->dir.dir == p_fs->root_dir) &&
+		    (fid->entry == -1)) {
+			info->Attr = ATTR_SUBDIR;
+			memset((char *)&info->CreateTimestamp, 0,
+			       sizeof(struct date_time_t));
+			memset((char *)&info->ModifyTimestamp, 0,
+			       sizeof(struct date_time_t));
+			memset((char *)&info->AccessTimestamp, 0,
+			       sizeof(struct date_time_t));
+			strcpy(info->ShortName, ".");
+			strcpy(info->Name, ".");
+
+			dir.dir = p_fs->root_dir;
+			dir.flags = 0x01;
+
+			if (p_fs->root_dir == CLUSTER_32(0)) {
+				/* FAT16 root_dir */
+				info->Size = p_fs->dentries_in_root <<
+						DENTRY_SIZE_BITS;
+			} else {
+				info->Size = count_num_clusters(sb, &dir) <<
+						p_fs->cluster_size_bits;
+			}
+
+			count = count_dos_name_entries(sb, &dir, TYPE_DIR);
+			if (count < 0) {
+				ret = FFS_MEDIAERR;
+				goto out;
+			}
+			info->NumSubdirs = count;
+
+			if (p_fs->dev_ejected)
+				ret = FFS_MEDIAERR;
+			goto out;
+		}
+	}
+
+	/* get the directory entry of given file or directory */
+	if (p_fs->vol_type == EXFAT) {
+		es = get_entry_set_in_dir(sb, &(fid->dir), fid->entry,
+					  ES_2_ENTRIES, &ep);
+		if (es == NULL) {
+			ret = FFS_MEDIAERR;
+			goto out;
+		}
+		ep2 = ep+1;
+	} else {
+		ep = get_entry_in_dir(sb, &(fid->dir), fid->entry, &sector);
+		if (!ep) {
+			ret = FFS_MEDIAERR;
+			goto out;
+		}
+		ep2 = ep;
+		buf_lock(sb, sector);
+	}
+
+	/* set FILE_INFO structure using the acquired struct dentry_t */
+	info->Attr = p_fs->fs_func->get_entry_attr(ep);
+
+	p_fs->fs_func->get_entry_time(ep, &tm, TM_CREATE);
+	info->CreateTimestamp.Year = tm.year;
+	info->CreateTimestamp.Month = tm.mon;
+	info->CreateTimestamp.Day = tm.day;
+	info->CreateTimestamp.Hour = tm.hour;
+	info->CreateTimestamp.Minute = tm.min;
+	info->CreateTimestamp.Second = tm.sec;
+	info->CreateTimestamp.MilliSecond = 0;
+
+	p_fs->fs_func->get_entry_time(ep, &tm, TM_MODIFY);
+	info->ModifyTimestamp.Year = tm.year;
+	info->ModifyTimestamp.Month = tm.mon;
+	info->ModifyTimestamp.Day = tm.day;
+	info->ModifyTimestamp.Hour = tm.hour;
+	info->ModifyTimestamp.Minute = tm.min;
+	info->ModifyTimestamp.Second = tm.sec;
+	info->ModifyTimestamp.MilliSecond = 0;
+
+	memset((char *) &info->AccessTimestamp, 0, sizeof(struct date_time_t));
+
+	*(uni_name.name) = 0x0;
+	/* XXX this is very bad for exfat cuz name is already included in es.
+	 * API should be revised
+	 */
+	p_fs->fs_func->get_uni_name_from_ext_entry(sb, &(fid->dir), fid->entry,
+						   uni_name.name);
+	if (*uni_name.name == 0x0 && p_fs->vol_type != EXFAT)
+		get_uni_name_from_dos_entry(sb, (struct dos_dentry_t *)ep,
+					    &uni_name, 0x1);
+	nls_uniname_to_cstring(sb, info->Name, &uni_name);
+
+	if (p_fs->vol_type == EXFAT) {
+		info->NumSubdirs = 2;
+	} else {
+		buf_unlock(sb, sector);
+		get_uni_name_from_dos_entry(sb, (struct dos_dentry_t *)ep,
+					    &uni_name, 0x0);
+		nls_uniname_to_cstring(sb, info->ShortName, &uni_name);
+		info->NumSubdirs = 0;
+	}
+
+	info->Size = p_fs->fs_func->get_entry_size(ep2);
+
+	if (p_fs->vol_type == EXFAT)
+		release_entry_set(es);
+
+	if (is_dir) {
+		dir.dir = fid->start_clu;
+		dir.flags = 0x01;
+
+		if (info->Size == 0)
+			info->Size = (u64)count_num_clusters(sb, &dir) <<
+					p_fs->cluster_size_bits;
+
+		count = count_dos_name_entries(sb, &dir, TYPE_DIR);
+		if (count < 0) {
+			ret = FFS_MEDIAERR;
+			goto out;
+		}
+		info->NumSubdirs += count;
+	}
+
+	if (p_fs->dev_ejected)
+		ret = FFS_MEDIAERR;
+
+out:
+	/* release the lock for file system critical section */
+	up(&p_fs->v_sem);
+
+	pr_debug("%s exited successfully\n", __func__);
+	return ret;
+}
+
+static int ffsWriteStat(struct inode *inode, struct dir_entry_t *info)
+{
+	sector_t sector = 0;
+	int ret = FFS_SUCCESS;
+	struct timestamp_t tm;
+	struct dentry_t *ep, *ep2;
+	struct entry_set_cache_t *es = NULL;
+	struct super_block *sb = inode->i_sb;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+	struct file_id_t *fid = &(EXFAT_I(inode)->fid);
+	u8 is_dir = (fid->type == TYPE_DIR) ? 1 : 0;
+
+	pr_debug("%s entered (inode %p info %p\n", __func__, inode, info);
+
+	/* acquire the lock for file system critical section */
+	down(&p_fs->v_sem);
+
+	if (is_dir) {
+		if ((fid->dir.dir == p_fs->root_dir) &&
+		    (fid->entry == -1)) {
+			if (p_fs->dev_ejected)
+				ret = FFS_MEDIAERR;
+			ret = FFS_SUCCESS;
+			goto out;
+		}
+	}
+
+	fs_set_vol_flags(sb, VOL_DIRTY);
+
+	/* get the directory entry of given file or directory */
+	if (p_fs->vol_type == EXFAT) {
+		es = get_entry_set_in_dir(sb, &(fid->dir), fid->entry,
+					  ES_ALL_ENTRIES, &ep);
+		if (es == NULL) {
+			ret = FFS_MEDIAERR;
+			goto out;
+		}
+		ep2 = ep+1;
+	} else {
+		/* for other than exfat */
+		ep = get_entry_in_dir(sb, &(fid->dir), fid->entry, &sector);
+		if (!ep) {
+			ret = FFS_MEDIAERR;
+			goto out;
+		}
+		ep2 = ep;
+	}
+
+	p_fs->fs_func->set_entry_attr(ep, info->Attr);
+
+	/* set FILE_INFO structure using the acquired struct dentry_t */
+	tm.sec  = info->CreateTimestamp.Second;
+	tm.min  = info->CreateTimestamp.Minute;
+	tm.hour = info->CreateTimestamp.Hour;
+	tm.day  = info->CreateTimestamp.Day;
+	tm.mon  = info->CreateTimestamp.Month;
+	tm.year = info->CreateTimestamp.Year;
+	p_fs->fs_func->set_entry_time(ep, &tm, TM_CREATE);
+
+	tm.sec  = info->ModifyTimestamp.Second;
+	tm.min  = info->ModifyTimestamp.Minute;
+	tm.hour = info->ModifyTimestamp.Hour;
+	tm.day  = info->ModifyTimestamp.Day;
+	tm.mon  = info->ModifyTimestamp.Month;
+	tm.year = info->ModifyTimestamp.Year;
+	p_fs->fs_func->set_entry_time(ep, &tm, TM_MODIFY);
+
+	p_fs->fs_func->set_entry_size(ep2, info->Size);
+
+	if (p_fs->vol_type != EXFAT) {
+		buf_modify(sb, sector);
+	} else {
+		update_dir_checksum_with_entry_set(sb, es);
+		release_entry_set(es);
+	}
+
+	if (p_fs->dev_ejected)
+		ret = FFS_MEDIAERR;
+
+out:
+	/* release the lock for file system critical section */
+	up(&p_fs->v_sem);
+
+	pr_debug("%s exited (%d)\n", __func__, ret);
+
+	return ret;
+}
+
+static int ffsMapCluster(struct inode *inode, s32 clu_offset, u32 *clu)
+{
+	s32 num_clusters, num_alloced, modified = FALSE;
+	u32 last_clu;
+	int ret = FFS_SUCCESS;
+	sector_t sector = 0;
+	struct chain_t new_clu;
+	struct dentry_t *ep;
+	struct entry_set_cache_t *es = NULL;
+	struct super_block *sb = inode->i_sb;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+	struct file_id_t *fid = &(EXFAT_I(inode)->fid);
+
+	/* check the validity of pointer parameters */
+	if (clu == NULL)
+		return FFS_ERROR;
+
+	/* acquire the lock for file system critical section */
+	down(&p_fs->v_sem);
+
+	fid->rwoffset = (s64)(clu_offset) << p_fs->cluster_size_bits;
+
+	if (EXFAT_I(inode)->mmu_private == 0)
+		num_clusters = 0;
+	else
+		num_clusters = (s32)((EXFAT_I(inode)->mmu_private - 1) >>
+				     p_fs->cluster_size_bits) + 1;
+
+	*clu = last_clu = fid->start_clu;
+
+	if (fid->flags == 0x03) {
+		if ((clu_offset > 0) && (*clu != CLUSTER_32(~0))) {
+			last_clu += clu_offset - 1;
+
+			if (clu_offset == num_clusters)
+				*clu = CLUSTER_32(~0);
+			else
+				*clu += clu_offset;
+		}
+	} else {
+		/* hint information */
+		if ((clu_offset > 0) && (fid->hint_last_off > 0) &&
+		    (clu_offset >= fid->hint_last_off)) {
+			clu_offset -= fid->hint_last_off;
+			*clu = fid->hint_last_clu;
+		}
+
+		while ((clu_offset > 0) && (*clu != CLUSTER_32(~0))) {
+			last_clu = *clu;
+			if (FAT_read(sb, *clu, clu) == -1) {
+				ret = FFS_MEDIAERR;
+				goto out;
+			}
+			clu_offset--;
+		}
+	}
+
+	if (*clu == CLUSTER_32(~0)) {
+		fs_set_vol_flags(sb, VOL_DIRTY);
+
+		new_clu.dir = (last_clu == CLUSTER_32(~0)) ? CLUSTER_32(~0) :
+					last_clu + 1;
+		new_clu.size = 0;
+		new_clu.flags = fid->flags;
+
+		/* (1) allocate a cluster */
+		num_alloced = p_fs->fs_func->alloc_cluster(sb, 1, &new_clu);
+		if (num_alloced < 0) {
+			ret = FFS_MEDIAERR;
+			goto out;
+		} else if (num_alloced == 0) {
+			ret = FFS_FULL;
+			goto out;
+		}
+
+		/* (2) append to the FAT chain */
+		if (last_clu == CLUSTER_32(~0)) {
+			if (new_clu.flags == 0x01)
+				fid->flags = 0x01;
+			fid->start_clu = new_clu.dir;
+			modified = TRUE;
+		} else {
+			if (new_clu.flags != fid->flags) {
+				exfat_chain_cont_cluster(sb, fid->start_clu,
+							 num_clusters);
+				fid->flags = 0x01;
+				modified = TRUE;
+			}
+			if (new_clu.flags == 0x01)
+				FAT_write(sb, last_clu, new_clu.dir);
+		}
+
+		num_clusters += num_alloced;
+		*clu = new_clu.dir;
+
+		if (p_fs->vol_type == EXFAT) {
+			es = get_entry_set_in_dir(sb, &fid->dir, fid->entry,
+						  ES_ALL_ENTRIES, &ep);
+			if (es == NULL) {
+				ret = FFS_MEDIAERR;
+				goto out;
+			}
+			/* get stream entry */
+			ep++;
+		}
+
+		/* (3) update directory entry */
+		if (modified) {
+			if (p_fs->vol_type != EXFAT) {
+				ep = get_entry_in_dir(sb, &(fid->dir),
+						      fid->entry, &sector);
+				if (!ep) {
+					ret = FFS_MEDIAERR;
+					goto out;
+				}
+			}
+
+			if (p_fs->fs_func->get_entry_flag(ep) != fid->flags)
+				p_fs->fs_func->set_entry_flag(ep, fid->flags);
+
+			if (p_fs->fs_func->get_entry_clu0(ep) != fid->start_clu)
+				p_fs->fs_func->set_entry_clu0(ep,
+							      fid->start_clu);
+
+			if (p_fs->vol_type != EXFAT)
+				buf_modify(sb, sector);
+		}
+
+		if (p_fs->vol_type == EXFAT) {
+			update_dir_checksum_with_entry_set(sb, es);
+			release_entry_set(es);
+		}
+
+		/* add number of new blocks to inode */
+		inode->i_blocks += num_alloced << (p_fs->cluster_size_bits - 9);
+	}
+
+	/* hint information */
+	fid->hint_last_off = (s32)(fid->rwoffset >> p_fs->cluster_size_bits);
+	fid->hint_last_clu = *clu;
+
+	if (p_fs->dev_ejected)
+		ret = FFS_MEDIAERR;
+
+out:
+	/* release the lock for file system critical section */
+	up(&p_fs->v_sem);
+
+	return ret;
+}
+
+/*----------------------------------------------------------------------*/
+/*  Directory Operation Functions                                       */
+/*----------------------------------------------------------------------*/
+
+static int ffsCreateDir(struct inode *inode, char *path, struct file_id_t *fid)
+{
+	int ret = FFS_SUCCESS;
+	struct chain_t dir;
+	struct uni_name_t uni_name;
+	struct super_block *sb = inode->i_sb;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+
+	pr_debug("%s entered\n", __func__);
+
+	/* check the validity of pointer parameters */
+	if ((fid == NULL) || (path == NULL) || (*path == '\0'))
+		return FFS_ERROR;
+
+	/* acquire the lock for file system critical section */
+	down(&p_fs->v_sem);
+
+	/* check the validity of directory name in the given old pathname */
+	ret = resolve_path(inode, path, &dir, &uni_name);
+	if (ret)
+		goto out;
+
+	fs_set_vol_flags(sb, VOL_DIRTY);
+
+	ret = create_dir(inode, &dir, &uni_name, fid);
+
+#ifdef CONFIG_EXFAT_DELAYED_SYNC
+	fs_sync(sb, false);
+	fs_set_vol_flags(sb, VOL_CLEAN);
+#endif
+
+	if (p_fs->dev_ejected)
+		ret = FFS_MEDIAERR;
+out:
+	/* release the lock for file system critical section */
+	up(&p_fs->v_sem);
+
+	return ret;
+}
+
+static int ffsReadDir(struct inode *inode, struct dir_entry_t *dir_entry)
+{
+	int i, dentry, clu_offset;
+	int ret = FFS_SUCCESS;
+	s32 dentries_per_clu, dentries_per_clu_bits = 0;
+	u32 type;
+	sector_t sector;
+	struct chain_t dir, clu;
+	struct uni_name_t uni_name;
+	struct timestamp_t tm;
+	struct dentry_t *ep;
+	struct super_block *sb = inode->i_sb;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+	struct fs_func *fs_func = p_fs->fs_func;
+	struct file_id_t *fid = &(EXFAT_I(inode)->fid);
+
+	/* check the validity of pointer parameters */
+	if (dir_entry == NULL)
+		return FFS_ERROR;
+
+	/* check if the given file ID is opened */
+	if (fid->type != TYPE_DIR)
+		return FFS_PERMISSIONERR;
+
+	/* acquire the lock for file system critical section */
+	down(&p_fs->v_sem);
+
+	if (fid->entry == -1) {
+		dir.dir = p_fs->root_dir;
+		dir.flags = 0x01;
+	} else {
+		dir.dir = fid->start_clu;
+		dir.size = (s32)(fid->size >> p_fs->cluster_size_bits);
+		dir.flags = fid->flags;
+	}
+
+	dentry = (s32)fid->rwoffset;
+
+	if (dir.dir == CLUSTER_32(0)) {
+		/* FAT16 root_dir */
+		dentries_per_clu = p_fs->dentries_in_root;
+
+		if (dentry == dentries_per_clu) {
+			clu.dir = CLUSTER_32(~0);
+		} else {
+			clu.dir = dir.dir;
+			clu.size = dir.size;
+			clu.flags = dir.flags;
+		}
+	} else {
+		dentries_per_clu = p_fs->dentries_per_clu;
+		dentries_per_clu_bits = ilog2(dentries_per_clu);
+
+		clu_offset = dentry >> dentries_per_clu_bits;
+		clu.dir = dir.dir;
+		clu.size = dir.size;
+		clu.flags = dir.flags;
+
+		if (clu.flags == 0x03) {
+			clu.dir += clu_offset;
+			clu.size -= clu_offset;
+		} else {
+			/* hint_information */
+			if ((clu_offset > 0) && (fid->hint_last_off > 0) &&
+			    (clu_offset >= fid->hint_last_off)) {
+				clu_offset -= fid->hint_last_off;
+				clu.dir = fid->hint_last_clu;
+			}
+
+			while (clu_offset > 0) {
+				/* clu.dir = FAT_read(sb, clu.dir); */
+				if (FAT_read(sb, clu.dir, &clu.dir) == -1) {
+					ret = FFS_MEDIAERR;
+					goto out;
+				}
+				clu_offset--;
+			}
+		}
+	}
+
+	while (clu.dir != CLUSTER_32(~0)) {
+		if (p_fs->dev_ejected)
+			break;
+
+		if (dir.dir == CLUSTER_32(0)) /* FAT16 root_dir */
+			i = dentry % dentries_per_clu;
+		else
+			i = dentry & (dentries_per_clu-1);
+
+		for ( ; i < dentries_per_clu; i++, dentry++) {
+			ep = get_entry_in_dir(sb, &clu, i, &sector);
+			if (!ep) {
+				ret = FFS_MEDIAERR;
+				goto out;
+			}
+			type = fs_func->get_entry_type(ep);
+
+			if (type == TYPE_UNUSED)
+				break;
+
+			if ((type != TYPE_FILE) && (type != TYPE_DIR))
+				continue;
+
+			buf_lock(sb, sector);
+			dir_entry->Attr = fs_func->get_entry_attr(ep);
+
+			fs_func->get_entry_time(ep, &tm, TM_CREATE);
+			dir_entry->CreateTimestamp.Year = tm.year;
+			dir_entry->CreateTimestamp.Month = tm.mon;
+			dir_entry->CreateTimestamp.Day = tm.day;
+			dir_entry->CreateTimestamp.Hour = tm.hour;
+			dir_entry->CreateTimestamp.Minute = tm.min;
+			dir_entry->CreateTimestamp.Second = tm.sec;
+			dir_entry->CreateTimestamp.MilliSecond = 0;
+
+			fs_func->get_entry_time(ep, &tm, TM_MODIFY);
+			dir_entry->ModifyTimestamp.Year = tm.year;
+			dir_entry->ModifyTimestamp.Month = tm.mon;
+			dir_entry->ModifyTimestamp.Day = tm.day;
+			dir_entry->ModifyTimestamp.Hour = tm.hour;
+			dir_entry->ModifyTimestamp.Minute = tm.min;
+			dir_entry->ModifyTimestamp.Second = tm.sec;
+			dir_entry->ModifyTimestamp.MilliSecond = 0;
+
+			memset((char *)&dir_entry->AccessTimestamp, 0,
+			       sizeof(struct date_time_t));
+
+			*(uni_name.name) = 0x0;
+			fs_func->get_uni_name_from_ext_entry(sb, &dir, dentry,
+							     uni_name.name);
+			if (*uni_name.name == 0x0 && p_fs->vol_type != EXFAT)
+				get_uni_name_from_dos_entry(sb,
+						(struct dos_dentry_t *)ep,
+						&uni_name, 0x1);
+			nls_uniname_to_cstring(sb, dir_entry->Name, &uni_name);
+			buf_unlock(sb, sector);
+
+			if (p_fs->vol_type == EXFAT) {
+				ep = get_entry_in_dir(sb, &clu, i+1, NULL);
+				if (!ep) {
+					ret = FFS_MEDIAERR;
+					goto out;
+				}
+			} else {
+				get_uni_name_from_dos_entry(sb,
+						(struct dos_dentry_t *)ep,
+						&uni_name, 0x0);
+				nls_uniname_to_cstring(sb, dir_entry->ShortName,
+						       &uni_name);
+			}
+
+			dir_entry->Size = fs_func->get_entry_size(ep);
+
+			/* hint information */
+			if (dir.dir == CLUSTER_32(0)) { /* FAT16 root_dir */
+			} else {
+				fid->hint_last_off = dentry >>
+							dentries_per_clu_bits;
+				fid->hint_last_clu = clu.dir;
+			}
+
+			fid->rwoffset = (s64) ++dentry;
+
+			if (p_fs->dev_ejected)
+				ret = FFS_MEDIAERR;
+			goto out;
+		}
+
+		if (dir.dir == CLUSTER_32(0))
+			break; /* FAT16 root_dir */
+
+		if (clu.flags == 0x03) {
+			if ((--clu.size) > 0)
+				clu.dir++;
+			else
+				clu.dir = CLUSTER_32(~0);
+		} else {
+			/* clu.dir = FAT_read(sb, clu.dir); */
+			if (FAT_read(sb, clu.dir, &clu.dir) == -1) {
+				ret = FFS_MEDIAERR;
+				goto out;
+			}
+		}
+	}
+
+	*(dir_entry->Name) = '\0';
+
+	fid->rwoffset = (s64) ++dentry;
+
+	if (p_fs->dev_ejected)
+		ret = FFS_MEDIAERR;
+
+out:
+	/* release the lock for file system critical section */
+	up(&p_fs->v_sem);
+
+	return ret;
+}
+
+static int ffsRemoveDir(struct inode *inode, struct file_id_t *fid)
+{
+	s32 dentry;
+	int ret = FFS_SUCCESS;
+	struct chain_t dir, clu_to_free;
+	struct super_block *sb = inode->i_sb;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+
+	/* check the validity of the given file id */
+	if (fid == NULL)
+		return FFS_INVALIDFID;
+
+	dir.dir = fid->dir.dir;
+	dir.size = fid->dir.size;
+	dir.flags = fid->dir.flags;
+
+	dentry = fid->entry;
+
+	/* check if the file is "." or ".." */
+	if (p_fs->vol_type != EXFAT) {
+		if ((dir.dir != p_fs->root_dir) && (dentry < 2))
+			return FFS_PERMISSIONERR;
+	}
+
+	/* acquire the lock for file system critical section */
+	down(&p_fs->v_sem);
+
+	clu_to_free.dir = fid->start_clu;
+	clu_to_free.size = (s32)((fid->size-1) >> p_fs->cluster_size_bits) + 1;
+	clu_to_free.flags = fid->flags;
+
+	if (!is_dir_empty(sb, &clu_to_free)) {
+		ret = FFS_FILEEXIST;
+		goto out;
+	}
+
+	fs_set_vol_flags(sb, VOL_DIRTY);
+
+	/* (1) update the directory entry */
+	remove_file(inode, &dir, dentry);
+
+	/* (2) free the clusters */
+	p_fs->fs_func->free_cluster(sb, &clu_to_free, 1);
+
+	fid->size = 0;
+	fid->start_clu = CLUSTER_32(~0);
+	fid->flags = (p_fs->vol_type == EXFAT) ? 0x03 : 0x01;
+
+#ifdef CONFIG_EXFAT_DELAYED_SYNC
+	fs_sync(sb, false);
+	fs_set_vol_flags(sb, VOL_CLEAN);
+#endif
+
+	if (p_fs->dev_ejected)
+		ret = FFS_MEDIAERR;
+
+out:
+	/* release the lock for file system critical section */
+	up(&p_fs->v_sem);
+
+	return ret;
+}
+
+/*======================================================================*/
+/*  Directory Entry Operations                                          */
+/*======================================================================*/
+
+static int exfat_readdir(struct file *filp, struct dir_context *ctx)
+{
+	struct inode *inode = file_inode(filp);
+	struct super_block *sb = inode->i_sb;
+	struct exfat_sb_info *sbi = EXFAT_SB(sb);
+	struct fs_info_t *p_fs = &(sbi->fs_info);
+	struct bd_info_t *p_bd = &(EXFAT_SB(sb)->bd_info);
+	struct dir_entry_t de;
+	unsigned long inum;
+	loff_t cpos;
+	int err = 0;
+
+	__lock_super(sb);
+
+	cpos = ctx->pos;
+	/* Fake . and .. for the root directory. */
+	if ((p_fs->vol_type == EXFAT) || (inode->i_ino == EXFAT_ROOT_INO)) {
+		while (cpos < 2) {
+			if (inode->i_ino == EXFAT_ROOT_INO)
+				inum = EXFAT_ROOT_INO;
+			else if (cpos == 0)
+				inum = inode->i_ino;
+			else /* (cpos == 1) */
+				inum = parent_ino(filp->f_path.dentry);
+
+			if (!dir_emit_dots(filp, ctx))
+				goto out;
+			cpos++;
+			ctx->pos++;
+		}
+		if (cpos == 2)
+			cpos = 0;
+	}
+	if (cpos & (DENTRY_SIZE - 1)) {
+		err = -ENOENT;
+		goto out;
+	}
+
+get_new:
+	EXFAT_I(inode)->fid.size = i_size_read(inode);
+	EXFAT_I(inode)->fid.rwoffset = cpos >> DENTRY_SIZE_BITS;
+
+	err = ffsReadDir(inode, &de);
+	if (err) {
+		/* at least we tried to read a sector
+		 * move cpos to next sector position (should be aligned)
+		 */
+		if (err == FFS_MEDIAERR) {
+			cpos += 1 << p_bd->sector_size_bits;
+			cpos &= ~((1 << p_bd->sector_size_bits)-1);
+		}
+
+		err = -EIO;
+		goto end_of_dir;
+	}
+
+	cpos = EXFAT_I(inode)->fid.rwoffset << DENTRY_SIZE_BITS;
+
+	if (!de.Name[0])
+		goto end_of_dir;
+
+	if (!memcmp(de.ShortName, DOS_CUR_DIR_NAME, DOS_NAME_LENGTH)) {
+		inum = inode->i_ino;
+	} else if (!memcmp(de.ShortName, DOS_PAR_DIR_NAME, DOS_NAME_LENGTH)) {
+		inum = parent_ino(filp->f_path.dentry);
+	} 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);
+		}
+	}
+
+	if (!dir_emit(ctx, de.Name, strlen(de.Name), inum,
+		      (de.Attr & ATTR_SUBDIR) ? DT_DIR : DT_REG))
+		goto out;
+
+	ctx->pos = cpos;
+	goto get_new;
+
+end_of_dir:
+	ctx->pos = cpos;
+out:
+	__unlock_super(sb);
+	return err;
+}
+
+static int exfat_ioctl_volume_id(struct inode *dir)
+{
+	struct super_block *sb = dir->i_sb;
+	struct exfat_sb_info *sbi = EXFAT_SB(sb);
+	struct fs_info_t *p_fs = &(sbi->fs_info);
+
+	return p_fs->vol_id;
+}
+
+static long exfat_generic_ioctl(struct file *filp, unsigned int cmd,
+				unsigned long arg)
+{
+struct inode *inode = filp->f_path.dentry->d_inode;
+#ifdef CONFIG_EXFAT_KERNEL_DEBUG
+	unsigned int flags;
+#endif /* CONFIG_EXFAT_KERNEL_DEBUG */
+
+	switch (cmd) {
+	case EXFAT_IOCTL_GET_VOLUME_ID:
+		return exfat_ioctl_volume_id(inode);
+#ifdef CONFIG_EXFAT_KERNEL_DEBUG
+	case EXFAT_IOC_GET_DEBUGFLAGS: {
+		struct super_block *sb = inode->i_sb;
+		struct exfat_sb_info *sbi = EXFAT_SB(sb);
+
+		flags = sbi->debug_flags;
+		return put_user(flags, (int __user *)arg);
+	}
+	case EXFAT_IOC_SET_DEBUGFLAGS: {
+		struct super_block *sb = inode->i_sb;
+		struct exfat_sb_info *sbi = EXFAT_SB(sb);
+
+		if (!capable(CAP_SYS_ADMIN))
+			return -EPERM;
+
+		if (get_user(flags, (int __user *) arg))
+			return -EFAULT;
+
+		__lock_super(sb);
+		sbi->debug_flags = flags;
+		__unlock_super(sb);
+
+		return 0;
+	}
+#endif /* CONFIG_EXFAT_KERNEL_DEBUG */
+	default:
+		return -ENOTTY; /* Inappropriate ioctl for device */
+	}
+}
+
+static const struct file_operations exfat_dir_operations = {
+	.llseek     = generic_file_llseek,
+	.read       = generic_read_dir,
+	.iterate    = exfat_readdir,
+	.unlocked_ioctl = exfat_generic_ioctl,
+	.fsync      = generic_file_fsync,
+};
+
+static int exfat_create(struct inode *dir, struct dentry *dentry, umode_t mode,
+			bool excl)
+{
+	struct super_block *sb = dir->i_sb;
+	struct inode *inode;
+	struct file_id_t fid;
+	loff_t i_pos;
+	int err;
+
+	__lock_super(sb);
+
+	pr_debug("%s entered\n", __func__);
+
+	err = ffsCreateFile(dir, (u8 *) dentry->d_name.name, FM_REGULAR, &fid);
+	if (err) {
+		if (err == FFS_INVALIDPATH)
+			err = -EINVAL;
+		else if (err == FFS_FILEEXIST)
+			err = -EEXIST;
+		else if (err == FFS_FULL)
+			err = -ENOSPC;
+		else if (err == FFS_NAMETOOLONG)
+			err = -ENAMETOOLONG;
+		else
+			err = -EIO;
+		goto out;
+	}
+	INC_IVERSION(dir);
+	dir->i_ctime = dir->i_mtime = dir->i_atime = current_time(dir);
+	if (IS_DIRSYNC(dir))
+		(void) exfat_sync_inode(dir);
+	else
+		mark_inode_dirty(dir);
+
+	i_pos = ((loff_t) fid.dir.dir << 32) | (fid.entry & 0xffffffff);
+
+	inode = exfat_build_inode(sb, &fid, i_pos);
+	if (IS_ERR(inode)) {
+		err = PTR_ERR(inode);
+		goto out;
+	}
+	INC_IVERSION(inode);
+	inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
+	/*
+	 * timestamp is already written, so mark_inode_dirty() is unnecessary.
+	 */
+
+	dentry->d_time = GET_IVERSION(dentry->d_parent->d_inode);
+	d_instantiate(dentry, inode);
+
+out:
+	__unlock_super(sb);
+	pr_debug("%s exited\n", __func__);
+	return err;
+}
+
+static int exfat_find(struct inode *dir, struct qstr *qname,
+		      struct file_id_t *fid)
+{
+	int err;
+
+	if (qname->len == 0)
+		return -ENOENT;
+
+	err = ffsLookupFile(dir, (u8 *) qname->name, fid);
+	if (err)
+		return -ENOENT;
+
+	return 0;
+}
+
+static int exfat_d_anon_disconn(struct dentry *dentry)
+{
+	return IS_ROOT(dentry) && (dentry->d_flags & DCACHE_DISCONNECTED);
+}
+
+static struct dentry *exfat_lookup(struct inode *dir, struct dentry *dentry,
+				   unsigned int flags)
+{
+	struct super_block *sb = dir->i_sb;
+	struct inode *inode;
+	struct dentry *alias;
+	int err;
+	struct file_id_t fid;
+	loff_t i_pos;
+	u64 ret;
+	mode_t i_mode;
+
+	__lock_super(sb);
+	pr_debug("%s entered\n", __func__);
+	err = exfat_find(dir, &dentry->d_name, &fid);
+	if (err) {
+		if (err == -ENOENT) {
+			inode = NULL;
+			goto out;
+		}
+		goto error;
+	}
+
+	i_pos = ((loff_t) fid.dir.dir << 32) | (fid.entry & 0xffffffff);
+	inode = exfat_build_inode(sb, &fid, i_pos);
+	if (IS_ERR(inode)) {
+		err = PTR_ERR(inode);
+		goto error;
+	}
+
+	i_mode = inode->i_mode;
+	if (S_ISLNK(i_mode) && !EXFAT_I(inode)->target) {
+		EXFAT_I(inode)->target = kmalloc(i_size_read(inode) + 1,
+						 GFP_KERNEL);
+		if (!EXFAT_I(inode)->target) {
+			err = -ENOMEM;
+			goto error;
+		}
+		ffsReadFile(dir, &fid, EXFAT_I(inode)->target,
+			    i_size_read(inode), &ret);
+		*(EXFAT_I(inode)->target + i_size_read(inode)) = '\0';
+	}
+
+	alias = d_find_alias(inode);
+	if (alias && !exfat_d_anon_disconn(alias)) {
+		BUG_ON(d_unhashed(alias));
+		if (!S_ISDIR(i_mode))
+			d_move(alias, dentry);
+		iput(inode);
+		__unlock_super(sb);
+		pr_debug("%s exited 1\n", __func__);
+		return alias;
+	}
+	dput(alias);
+out:
+	__unlock_super(sb);
+	dentry->d_time = GET_IVERSION(dentry->d_parent->d_inode);
+	dentry = d_splice_alias(inode, dentry);
+	if (dentry)
+		dentry->d_time = GET_IVERSION(dentry->d_parent->d_inode);
+	pr_debug("%s exited 2\n", __func__);
+	return dentry;
+
+error:
+	__unlock_super(sb);
+	pr_debug("%s exited 3\n", __func__);
+	return ERR_PTR(err);
+}
+
+static inline unsigned long exfat_hash(loff_t i_pos)
+{
+	return hash_32(i_pos, EXFAT_HASH_BITS);
+}
+
+static void exfat_attach(struct inode *inode, loff_t i_pos)
+{
+	struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);
+	struct hlist_head *head = sbi->inode_hashtable + exfat_hash(i_pos);
+
+	spin_lock(&sbi->inode_hash_lock);
+	EXFAT_I(inode)->i_pos = i_pos;
+	hlist_add_head(&EXFAT_I(inode)->i_hash_fat, head);
+	spin_unlock(&sbi->inode_hash_lock);
+}
+
+static void exfat_detach(struct inode *inode)
+{
+	struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);
+
+	spin_lock(&sbi->inode_hash_lock);
+	hlist_del_init(&EXFAT_I(inode)->i_hash_fat);
+	EXFAT_I(inode)->i_pos = 0;
+	spin_unlock(&sbi->inode_hash_lock);
+}
+
+static int exfat_unlink(struct inode *dir, struct dentry *dentry)
+{
+	struct inode *inode = dentry->d_inode;
+	struct super_block *sb = dir->i_sb;
+	int err;
+
+	__lock_super(sb);
+
+	pr_debug("%s entered\n", __func__);
+
+	EXFAT_I(inode)->fid.size = i_size_read(inode);
+
+	err = ffsRemoveFile(dir, &(EXFAT_I(inode)->fid));
+	if (err) {
+		if (err == FFS_PERMISSIONERR)
+			err = -EPERM;
+		else
+			err = -EIO;
+		goto out;
+	}
+	INC_IVERSION(dir);
+	dir->i_mtime = dir->i_atime = current_time(dir);
+	if (IS_DIRSYNC(dir))
+		(void) exfat_sync_inode(dir);
+	else
+		mark_inode_dirty(dir);
+
+	clear_nlink(inode);
+	inode->i_mtime = inode->i_atime = current_time(inode);
+	exfat_detach(inode);
+	remove_inode_hash(inode);
+
+out:
+	__unlock_super(sb);
+	pr_debug("%s exited\n", __func__);
+	return err;
+}
+
+static int exfat_symlink(struct inode *dir, struct dentry *dentry,
+			 const char *target)
+{
+	struct super_block *sb = dir->i_sb;
+	struct inode *inode;
+	struct file_id_t fid;
+	loff_t i_pos;
+	int err;
+	u64 len = (u64) strlen(target);
+	u64 ret;
+
+	__lock_super(sb);
+
+	pr_debug("%s entered\n", __func__);
+
+	err = ffsCreateFile(dir, (u8 *) dentry->d_name.name, FM_SYMLINK, &fid);
+	if (err) {
+		if (err == FFS_INVALIDPATH)
+			err = -EINVAL;
+		else if (err == FFS_FILEEXIST)
+			err = -EEXIST;
+		else if (err == FFS_FULL)
+			err = -ENOSPC;
+		else
+			err = -EIO;
+		goto out;
+	}
+
+	err = ffsWriteFile(dir, &fid, (char *) target, len, &ret);
+
+	if (err) {
+		ffsRemoveFile(dir, &fid);
+
+		if (err == FFS_FULL)
+			err = -ENOSPC;
+		else
+			err = -EIO;
+		goto out;
+	}
+
+	INC_IVERSION(dir);
+	dir->i_ctime = dir->i_mtime = dir->i_atime = current_time(dir);
+	if (IS_DIRSYNC(dir))
+		(void) exfat_sync_inode(dir);
+	else
+		mark_inode_dirty(dir);
+
+	i_pos = ((loff_t) fid.dir.dir << 32) | (fid.entry & 0xffffffff);
+
+	inode = exfat_build_inode(sb, &fid, i_pos);
+	if (IS_ERR(inode)) {
+		err = PTR_ERR(inode);
+		goto out;
+	}
+	INC_IVERSION(inode);
+	inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
+	/* timestamp is already written, so mark_inode_dirty() is unneeded. */
+
+	EXFAT_I(inode)->target = kmalloc(len+1, GFP_KERNEL);
+	if (!EXFAT_I(inode)->target) {
+		err = -ENOMEM;
+		goto out;
+	}
+	memcpy(EXFAT_I(inode)->target, target, len+1);
+
+	dentry->d_time = GET_IVERSION(dentry->d_parent->d_inode);
+	d_instantiate(dentry, inode);
+
+out:
+	__unlock_super(sb);
+	pr_debug("%s exited\n", __func__);
+	return err;
+}
+
+static int exfat_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
+{
+	struct super_block *sb = dir->i_sb;
+	struct inode *inode;
+	struct file_id_t fid;
+	loff_t i_pos;
+	int err;
+
+	__lock_super(sb);
+
+	pr_debug("%s entered\n", __func__);
+
+	err = ffsCreateDir(dir, (u8 *) dentry->d_name.name, &fid);
+	if (err) {
+		if (err == FFS_INVALIDPATH)
+			err = -EINVAL;
+		else if (err == FFS_FILEEXIST)
+			err = -EEXIST;
+		else if (err == FFS_FULL)
+			err = -ENOSPC;
+		else if (err == FFS_NAMETOOLONG)
+			err = -ENAMETOOLONG;
+		else
+			err = -EIO;
+		goto out;
+	}
+	INC_IVERSION(dir);
+	dir->i_ctime = dir->i_mtime = dir->i_atime = current_time(dir);
+	if (IS_DIRSYNC(dir))
+		(void) exfat_sync_inode(dir);
+	else
+		mark_inode_dirty(dir);
+	inc_nlink(dir);
+
+	i_pos = ((loff_t) fid.dir.dir << 32) | (fid.entry & 0xffffffff);
+
+	inode = exfat_build_inode(sb, &fid, i_pos);
+	if (IS_ERR(inode)) {
+		err = PTR_ERR(inode);
+		goto out;
+	}
+	INC_IVERSION(inode);
+	inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
+	/* timestamp is already written, so mark_inode_dirty() is unneeded. */
+
+	dentry->d_time = GET_IVERSION(dentry->d_parent->d_inode);
+	d_instantiate(dentry, inode);
+
+out:
+	__unlock_super(sb);
+	pr_debug("%s exited\n", __func__);
+	return err;
+}
+
+static int exfat_rmdir(struct inode *dir, struct dentry *dentry)
+{
+	struct inode *inode = dentry->d_inode;
+	struct super_block *sb = dir->i_sb;
+	int err;
+
+	__lock_super(sb);
+
+	pr_debug("%s entered\n", __func__);
+
+	EXFAT_I(inode)->fid.size = i_size_read(inode);
+
+	err = ffsRemoveDir(dir, &(EXFAT_I(inode)->fid));
+	if (err) {
+		if (err == FFS_INVALIDPATH)
+			err = -EINVAL;
+		else if (err == FFS_FILEEXIST)
+			err = -ENOTEMPTY;
+		else if (err == FFS_NOTFOUND)
+			err = -ENOENT;
+		else if (err == FFS_DIRBUSY)
+			err = -EBUSY;
+		else
+			err = -EIO;
+		goto out;
+	}
+	INC_IVERSION(dir);
+	dir->i_mtime = dir->i_atime = current_time(dir);
+	if (IS_DIRSYNC(dir))
+		(void) exfat_sync_inode(dir);
+	else
+		mark_inode_dirty(dir);
+	drop_nlink(dir);
+
+	clear_nlink(inode);
+	inode->i_mtime = inode->i_atime = current_time(inode);
+	exfat_detach(inode);
+	remove_inode_hash(inode);
+
+out:
+	__unlock_super(sb);
+	pr_debug("%s exited\n", __func__);
+	return err;
+}
+
+static int exfat_rename(struct inode *old_dir, struct dentry *old_dentry,
+			struct inode *new_dir, struct dentry *new_dentry,
+			unsigned int flags)
+{
+	struct inode *old_inode, *new_inode;
+	struct super_block *sb = old_dir->i_sb;
+	loff_t i_pos;
+	int err;
+
+	if (flags)
+		return -EINVAL;
+
+	__lock_super(sb);
+
+	pr_debug("%s entered\n", __func__);
+
+	old_inode = old_dentry->d_inode;
+	new_inode = new_dentry->d_inode;
+
+	EXFAT_I(old_inode)->fid.size = i_size_read(old_inode);
+
+	err = ffsMoveFile(old_dir, &(EXFAT_I(old_inode)->fid), new_dir,
+			  new_dentry);
+	if (err) {
+		if (err == FFS_PERMISSIONERR)
+			err = -EPERM;
+		else if (err == FFS_INVALIDPATH)
+			err = -EINVAL;
+		else if (err == FFS_FILEEXIST)
+			err = -EEXIST;
+		else if (err == FFS_NOTFOUND)
+			err = -ENOENT;
+		else if (err == FFS_FULL)
+			err = -ENOSPC;
+		else
+			err = -EIO;
+		goto out;
+	}
+	INC_IVERSION(new_dir);
+	new_dir->i_ctime = new_dir->i_mtime = new_dir->i_atime =
+				current_time(new_dir);
+	if (IS_DIRSYNC(new_dir))
+		(void) exfat_sync_inode(new_dir);
+	else
+		mark_inode_dirty(new_dir);
+
+	i_pos = ((loff_t) EXFAT_I(old_inode)->fid.dir.dir << 32) |
+			(EXFAT_I(old_inode)->fid.entry & 0xffffffff);
+
+	exfat_detach(old_inode);
+	exfat_attach(old_inode, i_pos);
+	if (IS_DIRSYNC(new_dir))
+		(void) exfat_sync_inode(old_inode);
+	else
+		mark_inode_dirty(old_inode);
+
+	if ((S_ISDIR(old_inode->i_mode)) && (old_dir != new_dir)) {
+		drop_nlink(old_dir);
+		if (!new_inode)
+			inc_nlink(new_dir);
+	}
+	INC_IVERSION(old_dir);
+	old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir);
+	if (IS_DIRSYNC(old_dir))
+		(void) exfat_sync_inode(old_dir);
+	else
+		mark_inode_dirty(old_dir);
+
+	if (new_inode) {
+		exfat_detach(new_inode);
+		drop_nlink(new_inode);
+		if (S_ISDIR(new_inode->i_mode))
+			drop_nlink(new_inode);
+		new_inode->i_ctime = current_time(new_inode);
+	}
+
+out:
+	__unlock_super(sb);
+	pr_debug("%s exited\n", __func__);
+	return err;
+}
+
+static int exfat_cont_expand(struct inode *inode, loff_t size)
+{
+	struct address_space *mapping = inode->i_mapping;
+	loff_t start = i_size_read(inode), count = size - i_size_read(inode);
+	int err, err2;
+
+	err = generic_cont_expand_simple(inode, size);
+	if (err != 0)
+		return err;
+
+	inode->i_ctime = inode->i_mtime = current_time(inode);
+	mark_inode_dirty(inode);
+
+	if (IS_SYNC(inode)) {
+		err = filemap_fdatawrite_range(mapping, start,
+					       start + count - 1);
+		err2 = sync_mapping_buffers(mapping);
+		err = (err) ? (err) : (err2);
+		err2 = write_inode_now(inode, 1);
+		err = (err) ? (err) : (err2);
+		if (!err)
+			err =  filemap_fdatawait_range(mapping, start,
+						       start + count - 1);
+	}
+	return err;
+}
+
+static int exfat_allow_set_time(struct exfat_sb_info *sbi, struct inode *inode)
+{
+	mode_t allow_utime = sbi->options.allow_utime;
+
+	if (!uid_eq(current_fsuid(), inode->i_uid)) {
+		if (in_group_p(inode->i_gid))
+			allow_utime >>= 3;
+		if (allow_utime & MAY_WRITE)
+			return 1;
+	}
+
+	/* use a default check */
+	return 0;
+}
+
+static int exfat_sanitize_mode(const struct exfat_sb_info *sbi,
+			       struct inode *inode, umode_t *mode_ptr)
+{
+	mode_t i_mode, mask, perm;
+
+	i_mode = inode->i_mode;
+
+	if (S_ISREG(i_mode) || S_ISLNK(i_mode))
+		mask = sbi->options.fs_fmask;
+	else
+		mask = sbi->options.fs_dmask;
+
+	perm = *mode_ptr & ~(S_IFMT | mask);
+
+	/* Of the r and x bits, all (subject to umask) must be present.*/
+	if ((perm & 0555) != (i_mode & 0555))
+		return -EPERM;
+
+	if (exfat_mode_can_hold_ro(inode)) {
+		/*
+		 * Of the w bits, either all (subject to umask) or none must be
+		 * present.
+		 */
+		if ((perm & 0222) && ((perm & 0222) != (0222 & ~mask)))
+			return -EPERM;
+	} else {
+		/*
+		 * If exfat_mode_can_hold_ro(inode) is false, can't change w
+		 * bits.
+		 */
+		if ((perm & 0222) != (0222 & ~mask))
+			return -EPERM;
+	}
+
+	*mode_ptr &= S_IFMT | perm;
+
+	return 0;
+}
+
+static void exfat_truncate(struct inode *inode, loff_t old_size)
+{
+	struct super_block *sb = inode->i_sb;
+	struct exfat_sb_info *sbi = EXFAT_SB(sb);
+	struct fs_info_t *p_fs = &(sbi->fs_info);
+	int err;
+
+	__lock_super(sb);
+
+	/*
+	 * This protects against truncating a file bigger than it was then
+	 * trying to write into the hole.
+	 */
+	if (EXFAT_I(inode)->mmu_private > i_size_read(inode))
+		EXFAT_I(inode)->mmu_private = i_size_read(inode);
+
+	if (EXFAT_I(inode)->fid.start_clu == 0)
+		goto out;
+
+	err = ffsTruncateFile(inode, old_size, i_size_read(inode));
+	if (err)
+		goto out;
+
+	inode->i_ctime = inode->i_mtime = current_time(inode);
+	if (IS_DIRSYNC(inode))
+		(void) exfat_sync_inode(inode);
+	else
+		mark_inode_dirty(inode);
+
+	inode->i_blocks = ((i_size_read(inode) + (p_fs->cluster_size - 1)) &
+			   ~((loff_t)p_fs->cluster_size - 1)) >> 9;
+out:
+	__unlock_super(sb);
+}
+
+static int exfat_setattr(struct dentry *dentry, struct iattr *attr)
+{
+
+	struct exfat_sb_info *sbi = EXFAT_SB(dentry->d_sb);
+	struct inode *inode = dentry->d_inode;
+	unsigned int ia_valid;
+	int error;
+	loff_t old_size;
+
+	pr_debug("%s entered\n", __func__);
+
+	if ((attr->ia_valid & ATTR_SIZE)
+		&& (attr->ia_size > i_size_read(inode))) {
+		error = exfat_cont_expand(inode, attr->ia_size);
+		if (error || attr->ia_valid == ATTR_SIZE)
+			return error;
+		attr->ia_valid &= ~ATTR_SIZE;
+	}
+
+	ia_valid = attr->ia_valid;
+
+	if ((ia_valid & (ATTR_MTIME_SET | ATTR_ATIME_SET | ATTR_TIMES_SET))
+		&& exfat_allow_set_time(sbi, inode)) {
+		attr->ia_valid &= ~(ATTR_MTIME_SET |
+				    ATTR_ATIME_SET |
+				    ATTR_TIMES_SET);
+	}
+
+	error = setattr_prepare(dentry, attr);
+	attr->ia_valid = ia_valid;
+	if (error)
+		return error;
+
+	if (((attr->ia_valid & ATTR_UID) &&
+	     (!uid_eq(attr->ia_uid, sbi->options.fs_uid))) ||
+	    ((attr->ia_valid & ATTR_GID) &&
+	     (!gid_eq(attr->ia_gid, sbi->options.fs_gid))) ||
+	    ((attr->ia_valid & ATTR_MODE) &&
+	     (attr->ia_mode & ~(S_IFREG | S_IFLNK | S_IFDIR | 0777)))) {
+		return -EPERM;
+	}
+
+	/*
+	 * We don't return -EPERM here. Yes, strange, but this is too
+	 * old behavior.
+	 */
+	if (attr->ia_valid & ATTR_MODE) {
+		if (exfat_sanitize_mode(sbi, inode, &attr->ia_mode) < 0)
+			attr->ia_valid &= ~ATTR_MODE;
+	}
+
+	EXFAT_I(inode)->fid.size = i_size_read(inode);
+
+	if (attr->ia_valid & ATTR_SIZE) {
+		old_size = i_size_read(inode);
+		down_write(&EXFAT_I(inode)->truncate_lock);
+		truncate_setsize(inode, attr->ia_size);
+		exfat_truncate(inode, old_size);
+		up_write(&EXFAT_I(inode)->truncate_lock);
+	}
+	setattr_copy(inode, attr);
+	mark_inode_dirty(inode);
+
+	pr_debug("%s exited\n", __func__);
+	return error;
+}
+
+static int exfat_getattr(const struct path *path, struct kstat *stat,
+			 u32 request_mask, unsigned int flags)
+{
+	struct inode *inode = path->dentry->d_inode;
+
+	pr_debug("%s entered\n", __func__);
+
+	generic_fillattr(inode, stat);
+	stat->blksize = EXFAT_SB(inode->i_sb)->fs_info.cluster_size;
+
+	pr_debug("%s exited\n", __func__);
+	return 0;
+}
+
+static const struct inode_operations exfat_dir_inode_operations = {
+	.create        = exfat_create,
+	.lookup        = exfat_lookup,
+	.unlink        = exfat_unlink,
+	.symlink       = exfat_symlink,
+	.mkdir         = exfat_mkdir,
+	.rmdir         = exfat_rmdir,
+	.rename        = exfat_rename,
+	.setattr       = exfat_setattr,
+	.getattr       = exfat_getattr,
+};
+
+/*======================================================================*/
+/*  File Operations                                                     */
+/*======================================================================*/
+static const char *exfat_get_link(struct dentry *dentry, struct inode *inode,
+				  struct delayed_call *done)
+{
+	struct exfat_inode_info *ei = EXFAT_I(inode);
+
+	if (ei->target != NULL) {
+		char *cookie = ei->target;
+
+		if (cookie != NULL)
+			return (char *)(ei->target);
+	}
+	return NULL;
+}
+
+static const struct inode_operations exfat_symlink_inode_operations = {
+		.get_link = exfat_get_link,
+};
+
+static int exfat_file_release(struct inode *inode, struct file *filp)
+{
+	struct super_block *sb = inode->i_sb;
+
+	EXFAT_I(inode)->fid.size = i_size_read(inode);
+	ffsSyncVol(sb, false);
+	return 0;
+}
+
+static const struct file_operations exfat_file_operations = {
+	.llseek      = generic_file_llseek,
+	.read_iter   = generic_file_read_iter,
+	.write_iter  = generic_file_write_iter,
+	.mmap        = generic_file_mmap,
+	.release     = exfat_file_release,
+	.unlocked_ioctl  = exfat_generic_ioctl,
+	.fsync       = generic_file_fsync,
+	.splice_read = generic_file_splice_read,
+};
+
+static const struct inode_operations exfat_file_inode_operations = {
+	.setattr     = exfat_setattr,
+	.getattr     = exfat_getattr,
+};
+
+/*======================================================================*/
+/*  Address Space Operations                                            */
+/*======================================================================*/
+
+static int exfat_bmap(struct inode *inode, sector_t sector, sector_t *phys,
+		      unsigned long *mapped_blocks, int *create)
+{
+	struct super_block *sb = inode->i_sb;
+	struct exfat_sb_info *sbi = EXFAT_SB(sb);
+	struct fs_info_t *p_fs = &(sbi->fs_info);
+	struct bd_info_t *p_bd = &(sbi->bd_info);
+	const unsigned long blocksize = sb->s_blocksize;
+	const unsigned char blocksize_bits = sb->s_blocksize_bits;
+	sector_t last_block;
+	int err, clu_offset, sec_offset;
+	unsigned int cluster;
+
+	*phys = 0;
+	*mapped_blocks = 0;
+
+	if ((p_fs->vol_type == FAT12) || (p_fs->vol_type == FAT16)) {
+		if (inode->i_ino == EXFAT_ROOT_INO) {
+			if (sector <
+			    (p_fs->dentries_in_root >>
+			     (p_bd->sector_size_bits-DENTRY_SIZE_BITS))) {
+				*phys = sector + p_fs->root_start_sector;
+				*mapped_blocks = 1;
+			}
+			return 0;
+		}
+	}
+
+	last_block = (i_size_read(inode) + (blocksize - 1)) >> blocksize_bits;
+	if (sector >= last_block) {
+		if (*create == 0)
+			return 0;
+	} else {
+		*create = 0;
+	}
+
+	/* cluster offset */
+	clu_offset = sector >> p_fs->sectors_per_clu_bits;
+
+	/* sector offset in cluster */
+	sec_offset = sector & (p_fs->sectors_per_clu - 1);
+
+	EXFAT_I(inode)->fid.size = i_size_read(inode);
+
+	err = ffsMapCluster(inode, clu_offset, &cluster);
+
+	if (err) {
+		if (err == FFS_FULL)
+			return -ENOSPC;
+		else
+			return -EIO;
+	} else if (cluster != CLUSTER_32(~0)) {
+		*phys = START_SECTOR(cluster) + sec_offset;
+		*mapped_blocks = p_fs->sectors_per_clu - sec_offset;
+	}
+
+	return 0;
+}
+
+static int exfat_get_block(struct inode *inode, sector_t iblock,
+			   struct buffer_head *bh_result, int create)
+{
+	struct super_block *sb = inode->i_sb;
+	unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits;
+	int err;
+	unsigned long mapped_blocks;
+	sector_t phys;
+
+	__lock_super(sb);
+
+	err = exfat_bmap(inode, iblock, &phys, &mapped_blocks, &create);
+	if (err) {
+		__unlock_super(sb);
+		return err;
+	}
+
+	if (phys) {
+		max_blocks = min(mapped_blocks, max_blocks);
+		if (create) {
+			EXFAT_I(inode)->mmu_private += max_blocks <<
+							sb->s_blocksize_bits;
+			set_buffer_new(bh_result);
+		}
+		map_bh(bh_result, sb, phys);
+	}
+
+	bh_result->b_size = max_blocks << sb->s_blocksize_bits;
+	__unlock_super(sb);
+
+	return 0;
+}
+
+static int exfat_readpage(struct file *file, struct page *page)
+{
+	return  mpage_readpage(page, exfat_get_block);
+}
+
+static int exfat_readpages(struct file *file, struct address_space *mapping,
+			   struct list_head *pages, unsigned int nr_pages)
+{
+	return  mpage_readpages(mapping, pages, nr_pages, exfat_get_block);
+}
+
+static int exfat_writepage(struct page *page, struct writeback_control *wbc)
+{
+	return block_write_full_page(page, exfat_get_block, wbc);
+}
+
+static int exfat_writepages(struct address_space *mapping,
+			    struct writeback_control *wbc)
+{
+	return mpage_writepages(mapping, wbc, exfat_get_block);
+}
+
+static void exfat_write_failed(struct address_space *mapping, loff_t to)
+{
+	struct inode *inode = mapping->host;
+
+	if (to > i_size_read(inode)) {
+		truncate_pagecache(inode, i_size_read(inode));
+		EXFAT_I(inode)->fid.size = i_size_read(inode);
+		exfat_truncate(inode, i_size_read(inode));
+	}
+}
+
+static int exfat_write_begin(struct file *file, struct address_space *mapping,
+			     loff_t pos, unsigned int len, unsigned int flags,
+			     struct page **pagep, void **fsdata)
+{
+	int ret;
+
+	*pagep = NULL;
+	ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
+			       exfat_get_block,
+			       &EXFAT_I(mapping->host)->mmu_private);
+
+	if (ret < 0)
+		exfat_write_failed(mapping, pos+len);
+	return ret;
+}
+
+static int exfat_write_end(struct file *file, struct address_space *mapping,
+			   loff_t pos, unsigned int len, unsigned int copied,
+			   struct page *pagep, void *fsdata)
+{
+	struct inode *inode = mapping->host;
+	struct file_id_t *fid = &(EXFAT_I(inode)->fid);
+	int err;
+
+	err = generic_write_end(file, mapping, pos, len, copied, pagep, fsdata);
+
+	if (err < len)
+		exfat_write_failed(mapping, pos+len);
+
+	if (!(err < 0) && !(fid->attr & ATTR_ARCHIVE)) {
+		inode->i_mtime = inode->i_ctime = current_time(inode);
+		fid->attr |= ATTR_ARCHIVE;
+		mark_inode_dirty(inode);
+	}
+	return err;
+}
+
+static ssize_t exfat_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
+{
+	struct inode *inode = iocb->ki_filp->f_mapping->host;
+	struct address_space *mapping = iocb->ki_filp->f_mapping;
+	ssize_t ret;
+	int rw;
+
+	rw = iov_iter_rw(iter);
+
+	if (rw == WRITE) {
+		if (EXFAT_I(inode)->mmu_private < iov_iter_count(iter))
+			return 0;
+	}
+	ret = blockdev_direct_IO(iocb, inode, iter, exfat_get_block);
+
+	if ((ret < 0) && (rw & WRITE))
+		exfat_write_failed(mapping, iov_iter_count(iter));
+	return ret;
+}
+
+static sector_t _exfat_bmap(struct address_space *mapping, sector_t block)
+{
+	sector_t blocknr;
+
+	/* exfat_get_cluster() assumes the requested blocknr isn't truncated. */
+	down_read(&EXFAT_I(mapping->host)->truncate_lock);
+	blocknr = generic_block_bmap(mapping, block, exfat_get_block);
+	up_read(&EXFAT_I(mapping->host)->truncate_lock);
+
+	return blocknr;
+}
+
+static const struct address_space_operations exfat_aops = {
+	.readpage    = exfat_readpage,
+	.readpages   = exfat_readpages,
+	.writepage   = exfat_writepage,
+	.writepages  = exfat_writepages,
+	.write_begin = exfat_write_begin,
+	.write_end   = exfat_write_end,
+	.direct_IO   = exfat_direct_IO,
+	.bmap        = _exfat_bmap
+};
+
+/*======================================================================*/
+/*  Super Operations                                                    */
+/*======================================================================*/
+
+static struct inode *exfat_iget(struct super_block *sb, loff_t i_pos)
+{
+	struct exfat_sb_info *sbi = EXFAT_SB(sb);
+	struct exfat_inode_info *info;
+	struct hlist_head *head = sbi->inode_hashtable + exfat_hash(i_pos);
+	struct inode *inode = NULL;
+
+	spin_lock(&sbi->inode_hash_lock);
+	hlist_for_each_entry(info, head, i_hash_fat) {
+		BUG_ON(info->vfs_inode.i_sb != sb);
+
+		if (i_pos != info->i_pos)
+			continue;
+		inode = igrab(&info->vfs_inode);
+		if (inode)
+			break;
+	}
+	spin_unlock(&sbi->inode_hash_lock);
+	return inode;
+}
+
+/* doesn't deal with root inode */
+static int exfat_fill_inode(struct inode *inode, struct file_id_t *fid)
+{
+	struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);
+	struct fs_info_t *p_fs = &(sbi->fs_info);
+	struct dir_entry_t info;
+
+	memcpy(&(EXFAT_I(inode)->fid), fid, sizeof(struct file_id_t));
+
+	ffsReadStat(inode, &info);
+
+	EXFAT_I(inode)->i_pos = 0;
+	EXFAT_I(inode)->target = NULL;
+	inode->i_uid = sbi->options.fs_uid;
+	inode->i_gid = sbi->options.fs_gid;
+	INC_IVERSION(inode);
+	inode->i_generation = get_seconds();
+
+	if (info.Attr & ATTR_SUBDIR) { /* directory */
+		inode->i_generation &= ~1;
+		inode->i_mode = exfat_make_mode(sbi, info.Attr, 0777);
+		inode->i_op = &exfat_dir_inode_operations;
+		inode->i_fop = &exfat_dir_operations;
+
+		i_size_write(inode, info.Size);
+		EXFAT_I(inode)->mmu_private = i_size_read(inode);
+		set_nlink(inode, info.NumSubdirs);
+	} else if (info.Attr & ATTR_SYMLINK) { /* symbolic link */
+		inode->i_generation |= 1;
+		inode->i_mode = exfat_make_mode(sbi, info.Attr, 0777);
+		inode->i_op = &exfat_symlink_inode_operations;
+
+		i_size_write(inode, info.Size);
+		EXFAT_I(inode)->mmu_private = i_size_read(inode);
+	} else { /* regular file */
+		inode->i_generation |= 1;
+		inode->i_mode = exfat_make_mode(sbi, info.Attr, 0777);
+		inode->i_op = &exfat_file_inode_operations;
+		inode->i_fop = &exfat_file_operations;
+		inode->i_mapping->a_ops = &exfat_aops;
+		inode->i_mapping->nrpages = 0;
+
+		i_size_write(inode, info.Size);
+		EXFAT_I(inode)->mmu_private = i_size_read(inode);
+	}
+	exfat_save_attr(inode, info.Attr);
+
+	inode->i_blocks = ((i_size_read(inode) + (p_fs->cluster_size - 1))
+				& ~((loff_t)p_fs->cluster_size - 1)) >> 9;
+
+	exfat_time_fat2unix(sbi, &inode->i_mtime, &info.ModifyTimestamp);
+	exfat_time_fat2unix(sbi, &inode->i_ctime, &info.CreateTimestamp);
+	exfat_time_fat2unix(sbi, &inode->i_atime, &info.AccessTimestamp);
+
+	return 0;
+}
+
+static struct inode *exfat_build_inode(struct super_block *sb,
+				       struct file_id_t *fid, loff_t i_pos)
+{
+	struct inode *inode;
+	int err;
+
+	inode = exfat_iget(sb, i_pos);
+	if (inode)
+		goto out;
+	inode = new_inode(sb);
+	if (!inode) {
+		inode = ERR_PTR(-ENOMEM);
+		goto out;
+	}
+	inode->i_ino = iunique(sb, EXFAT_ROOT_INO);
+	SET_IVERSION(inode, 1);
+	err = exfat_fill_inode(inode, fid);
+	if (err) {
+		iput(inode);
+		inode = ERR_PTR(err);
+		goto out;
+	}
+	exfat_attach(inode, i_pos);
+	insert_inode_hash(inode);
+out:
+	return inode;
+}
+
+static int exfat_sync_inode(struct inode *inode)
+{
+	return exfat_write_inode(inode, NULL);
+}
+
+static struct inode *exfat_alloc_inode(struct super_block *sb)
+{
+	struct exfat_inode_info *ei;
+
+	ei = kmem_cache_alloc(exfat_inode_cachep, GFP_NOFS);
+	if (!ei)
+		return NULL;
+
+	init_rwsem(&ei->truncate_lock);
+
+	return &ei->vfs_inode;
+}
+
+static void exfat_destroy_inode(struct inode *inode)
+{
+	if (EXFAT_I(inode)->target)
+		kfree(EXFAT_I(inode)->target);
+	EXFAT_I(inode)->target = NULL;
+
+	kmem_cache_free(exfat_inode_cachep, EXFAT_I(inode));
+}
+
+static int exfat_write_inode(struct inode *inode, struct writeback_control *wbc)
+{
+	struct super_block *sb = inode->i_sb;
+	struct exfat_sb_info *sbi = EXFAT_SB(sb);
+	struct dir_entry_t info;
+
+	if (inode->i_ino == EXFAT_ROOT_INO)
+		return 0;
+
+	info.Attr = exfat_make_attr(inode);
+	info.Size = i_size_read(inode);
+
+	exfat_time_unix2fat(sbi, &inode->i_mtime, &info.ModifyTimestamp);
+	exfat_time_unix2fat(sbi, &inode->i_ctime, &info.CreateTimestamp);
+	exfat_time_unix2fat(sbi, &inode->i_atime, &info.AccessTimestamp);
+
+	ffsWriteStat(inode, &info);
+
+	return 0;
+}
+
+static void exfat_evict_inode(struct inode *inode)
+{
+	truncate_inode_pages(&inode->i_data, 0);
+
+	if (!inode->i_nlink)
+		i_size_write(inode, 0);
+	invalidate_inode_buffers(inode);
+	clear_inode(inode);
+	exfat_detach(inode);
+
+	remove_inode_hash(inode);
+}
+
+static void exfat_free_super(struct exfat_sb_info *sbi)
+{
+	if (sbi->nls_disk)
+		unload_nls(sbi->nls_disk);
+	if (sbi->nls_io)
+		unload_nls(sbi->nls_io);
+	if (sbi->options.iocharset != exfat_default_iocharset)
+		kfree(sbi->options.iocharset);
+	/* mutex_init is in exfat_fill_super function. only for 3.7+ */
+	mutex_destroy(&sbi->s_lock);
+	kfree(sbi);
+}
+
+static void exfat_put_super(struct super_block *sb)
+{
+	struct exfat_sb_info *sbi = EXFAT_SB(sb);
+
+	if (__is_sb_dirty(sb))
+		exfat_write_super(sb);
+
+	ffsUmountVol(sb);
+
+	sb->s_fs_info = NULL;
+	exfat_free_super(sbi);
+}
+
+static void exfat_write_super(struct super_block *sb)
+{
+	__lock_super(sb);
+
+	__set_sb_clean(sb);
+
+	if (!sb_rdonly(sb))
+		ffsSyncVol(sb, true);
+
+	__unlock_super(sb);
+}
+
+static int exfat_sync_fs(struct super_block *sb, int wait)
+{
+	int err = 0;
+
+	if (__is_sb_dirty(sb)) {
+		__lock_super(sb);
+		__set_sb_clean(sb);
+		err = ffsSyncVol(sb, true);
+		__unlock_super(sb);
+	}
+
+	return err;
+}
+
+static int exfat_statfs(struct dentry *dentry, struct kstatfs *buf)
+{
+	struct super_block *sb = dentry->d_sb;
+	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+	struct vol_info_t info;
+
+	if (p_fs->used_clusters == (u32) ~0) {
+		if (ffsGetVolInfo(sb, &info) == FFS_MEDIAERR)
+			return -EIO;
+
+	} else {
+		info.FatType = p_fs->vol_type;
+		info.ClusterSize = p_fs->cluster_size;
+		info.NumClusters = p_fs->num_clusters - 2;
+		info.UsedClusters = p_fs->used_clusters;
+		info.FreeClusters = info.NumClusters - info.UsedClusters;
+
+		if (p_fs->dev_ejected)
+			pr_info("[EXFAT] statfs on device that is ejected\n");
+	}
+
+	buf->f_type = sb->s_magic;
+	buf->f_bsize = info.ClusterSize;
+	buf->f_blocks = info.NumClusters;
+	buf->f_bfree = info.FreeClusters;
+	buf->f_bavail = info.FreeClusters;
+	buf->f_fsid.val[0] = (u32)id;
+	buf->f_fsid.val[1] = (u32)(id >> 32);
+	buf->f_namelen = 260;
+
+	return 0;
+}
+
+static int exfat_remount(struct super_block *sb, int *flags, char *data)
+{
+	*flags |= SB_NODIRATIME;
+	return 0;
+}
+
+static int exfat_show_options(struct seq_file *m, struct dentry *root)
+{
+	struct exfat_sb_info *sbi = EXFAT_SB(root->d_sb);
+	struct exfat_mount_options *opts = &sbi->options;
+
+	if (__kuid_val(opts->fs_uid))
+		seq_printf(m, ",uid=%u", __kuid_val(opts->fs_uid));
+	if (__kgid_val(opts->fs_gid))
+		seq_printf(m, ",gid=%u", __kgid_val(opts->fs_gid));
+	seq_printf(m, ",fmask=%04o", opts->fs_fmask);
+	seq_printf(m, ",dmask=%04o", opts->fs_dmask);
+	if (opts->allow_utime)
+		seq_printf(m, ",allow_utime=%04o", opts->allow_utime);
+	if (sbi->nls_disk)
+		seq_printf(m, ",codepage=%s", sbi->nls_disk->charset);
+	if (sbi->nls_io)
+		seq_printf(m, ",iocharset=%s", sbi->nls_io->charset);
+	seq_printf(m, ",namecase=%u", opts->casesensitive);
+	if (opts->errors == EXFAT_ERRORS_CONT)
+		seq_puts(m, ",errors=continue");
+	else if (opts->errors == EXFAT_ERRORS_PANIC)
+		seq_puts(m, ",errors=panic");
+	else
+		seq_puts(m, ",errors=remount-ro");
+#ifdef CONFIG_EXFAT_DISCARD
+	if (opts->discard)
+		seq_puts(m, ",discard");
+#endif
+	return 0;
+}
+
+static const struct super_operations exfat_sops = {
+	.alloc_inode   = exfat_alloc_inode,
+	.destroy_inode = exfat_destroy_inode,
+	.write_inode   = exfat_write_inode,
+	.evict_inode  = exfat_evict_inode,
+	.put_super     = exfat_put_super,
+	.sync_fs       = exfat_sync_fs,
+	.statfs        = exfat_statfs,
+	.remount_fs    = exfat_remount,
+	.show_options  = exfat_show_options,
+};
+
+/*======================================================================*/
+/*  Export Operations                                                   */
+/*======================================================================*/
+
+static struct inode *exfat_nfs_get_inode(struct super_block *sb, u64 ino,
+					 u32 generation)
+{
+	struct inode *inode = NULL;
+
+	if (ino < EXFAT_ROOT_INO)
+		return inode;
+	inode = ilookup(sb, ino);
+
+	if (inode && generation && (inode->i_generation != generation)) {
+		iput(inode);
+		inode = NULL;
+	}
+
+	return inode;
+}
+
+static struct dentry *exfat_fh_to_dentry(struct super_block *sb,
+					 struct fid *fid, int fh_len,
+					 int fh_type)
+{
+	return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
+				exfat_nfs_get_inode);
+}
+
+static struct dentry *exfat_fh_to_parent(struct super_block *sb,
+					 struct fid *fid, int fh_len,
+					 int fh_type)
+{
+	return generic_fh_to_parent(sb, fid, fh_len, fh_type,
+				exfat_nfs_get_inode);
+}
+
+static const struct export_operations exfat_export_ops = {
+	.fh_to_dentry   = exfat_fh_to_dentry,
+	.fh_to_parent   = exfat_fh_to_parent,
+};
+
+/*======================================================================*/
+/*  Super Block Read Operations                                         */
+/*======================================================================*/
+
+enum {
+	Opt_uid,
+	Opt_gid,
+	Opt_umask,
+	Opt_dmask,
+	Opt_fmask,
+	Opt_allow_utime,
+	Opt_codepage,
+	Opt_charset,
+	Opt_namecase,
+	Opt_debug,
+	Opt_err_cont,
+	Opt_err_panic,
+	Opt_err_ro,
+	Opt_utf8_hack,
+	Opt_err,
+#ifdef CONFIG_EXFAT_DISCARD
+	Opt_discard,
+#endif /* EXFAT_CONFIG_DISCARD */
+};
+
+static const match_table_t exfat_tokens = {
+	{Opt_uid, "uid=%u"},
+	{Opt_gid, "gid=%u"},
+	{Opt_umask, "umask=%o"},
+	{Opt_dmask, "dmask=%o"},
+	{Opt_fmask, "fmask=%o"},
+	{Opt_allow_utime, "allow_utime=%o"},
+	{Opt_codepage, "codepage=%u"},
+	{Opt_charset, "iocharset=%s"},
+	{Opt_namecase, "namecase=%u"},
+	{Opt_debug, "debug"},
+	{Opt_err_cont, "errors=continue"},
+	{Opt_err_panic, "errors=panic"},
+	{Opt_err_ro, "errors=remount-ro"},
+	{Opt_utf8_hack, "utf8"},
+#ifdef CONFIG_EXFAT_DISCARD
+	{Opt_discard, "discard"},
+#endif /* CONFIG_EXFAT_DISCARD */
+	{Opt_err, NULL}
+};
+
+static int parse_options(char *options, int silent, int *debug,
+			 struct exfat_mount_options *opts)
+{
+	char *p;
+	substring_t args[MAX_OPT_ARGS];
+	int option;
+	char *iocharset;
+
+	opts->fs_uid = current_uid();
+	opts->fs_gid = current_gid();
+	opts->fs_fmask = opts->fs_dmask = current->fs->umask;
+	opts->allow_utime = (unsigned short) -1;
+	opts->codepage = exfat_default_codepage;
+	opts->iocharset = exfat_default_iocharset;
+	opts->casesensitive = 0;
+	opts->errors = EXFAT_ERRORS_RO;
+#ifdef CONFIG_EXFAT_DISCARD
+	opts->discard = 0;
+#endif
+	*debug = 0;
+
+	if (!options)
+		goto out;
+
+	while ((p = strsep(&options, ",")) != NULL) {
+		int token;
+
+		if (!*p)
+			continue;
+
+		token = match_token(p, exfat_tokens, args);
+		switch (token) {
+		case Opt_uid:
+			if (match_int(&args[0], &option))
+				return 0;
+			opts->fs_uid = KUIDT_INIT(option);
+			break;
+		case Opt_gid:
+			if (match_int(&args[0], &option))
+				return 0;
+			opts->fs_gid = KGIDT_INIT(option);
+			break;
+		case Opt_umask:
+		case Opt_dmask:
+		case Opt_fmask:
+			if (match_octal(&args[0], &option))
+				return 0;
+			if (token != Opt_dmask)
+				opts->fs_fmask = option;
+			if (token != Opt_fmask)
+				opts->fs_dmask = option;
+			break;
+		case Opt_allow_utime:
+			if (match_octal(&args[0], &option))
+				return 0;
+			opts->allow_utime = option & 0022;
+			break;
+		case Opt_codepage:
+			if (match_int(&args[0], &option))
+				return 0;
+			opts->codepage = option;
+			break;
+		case Opt_charset:
+			if (opts->iocharset != exfat_default_iocharset)
+				kfree(opts->iocharset);
+			iocharset = match_strdup(&args[0]);
+			if (!iocharset)
+				return -ENOMEM;
+			opts->iocharset = iocharset;
+			break;
+		case Opt_namecase:
+			if (match_int(&args[0], &option))
+				return 0;
+			opts->casesensitive = option;
+			break;
+		case Opt_err_cont:
+			opts->errors = EXFAT_ERRORS_CONT;
+			break;
+		case Opt_err_panic:
+			opts->errors = EXFAT_ERRORS_PANIC;
+			break;
+		case Opt_err_ro:
+			opts->errors = EXFAT_ERRORS_RO;
+			break;
+		case Opt_debug:
+			*debug = 1;
+			break;
+#ifdef CONFIG_EXFAT_DISCARD
+		case Opt_discard:
+			opts->discard = 1;
+			break;
+#endif /* CONFIG_EXFAT_DISCARD */
+		case Opt_utf8_hack:
+			break;
+		default:
+			if (!silent)
+				pr_err("[EXFAT] Unrecognized mount option %s or missing value\n",
+				       p);
+			return -EINVAL;
+		}
+	}
+
+out:
+	if (opts->allow_utime == (unsigned short) -1)
+		opts->allow_utime = ~opts->fs_dmask & 0022;
+
+	return 0;
+}
+
+static void exfat_hash_init(struct super_block *sb)
+{
+	struct exfat_sb_info *sbi = EXFAT_SB(sb);
+	int i;
+
+	spin_lock_init(&sbi->inode_hash_lock);
+	for (i = 0; i < EXFAT_HASH_SIZE; i++)
+		INIT_HLIST_HEAD(&sbi->inode_hashtable[i]);
+}
+
+static int exfat_read_root(struct inode *inode)
+{
+	struct super_block *sb = inode->i_sb;
+	struct exfat_sb_info *sbi = EXFAT_SB(sb);
+	struct fs_info_t *p_fs = &(sbi->fs_info);
+	struct dir_entry_t info;
+
+	EXFAT_I(inode)->fid.dir.dir = p_fs->root_dir;
+	EXFAT_I(inode)->fid.dir.flags = 0x01;
+	EXFAT_I(inode)->fid.entry = -1;
+	EXFAT_I(inode)->fid.start_clu = p_fs->root_dir;
+	EXFAT_I(inode)->fid.flags = 0x01;
+	EXFAT_I(inode)->fid.type = TYPE_DIR;
+	EXFAT_I(inode)->fid.rwoffset = 0;
+	EXFAT_I(inode)->fid.hint_last_off = -1;
+
+	EXFAT_I(inode)->target = NULL;
+
+	ffsReadStat(inode, &info);
+
+	inode->i_uid = sbi->options.fs_uid;
+	inode->i_gid = sbi->options.fs_gid;
+	INC_IVERSION(inode);
+	inode->i_generation = 0;
+	inode->i_mode = exfat_make_mode(sbi, ATTR_SUBDIR, 0777);
+	inode->i_op = &exfat_dir_inode_operations;
+	inode->i_fop = &exfat_dir_operations;
+
+	i_size_write(inode, info.Size);
+	inode->i_blocks = ((i_size_read(inode) + (p_fs->cluster_size - 1))
+				& ~((loff_t)p_fs->cluster_size - 1)) >> 9;
+	EXFAT_I(inode)->i_pos = ((loff_t) p_fs->root_dir << 32) | 0xffffffff;
+	EXFAT_I(inode)->mmu_private = i_size_read(inode);
+
+	exfat_save_attr(inode, ATTR_SUBDIR);
+	inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
+	set_nlink(inode, info.NumSubdirs + 2);
+
+	return 0;
+}
+
+static void setup_dops(struct super_block *sb)
+{
+	if (EXFAT_SB(sb)->options.casesensitive == 0)
+		sb->s_d_op = &exfat_ci_dentry_ops;
+	else
+		sb->s_d_op = &exfat_dentry_ops;
+}
+
+static int exfat_fill_super(struct super_block *sb, void *data, int silent)
+{
+	struct inode *root_inode = NULL;
+	struct exfat_sb_info *sbi;
+	int debug, ret;
+	long error;
+	char buf[50];
+
+	/*
+	 * GFP_KERNEL is ok here, because while we do hold the
+	 * supeblock lock, memory pressure can't call back into
+	 * the filesystem, since we're only just about to mount
+	 * it and have no inodes etc active!
+	 */
+	sbi = kzalloc(sizeof(struct exfat_sb_info), GFP_KERNEL);
+	if (!sbi)
+		return -ENOMEM;
+	mutex_init(&sbi->s_lock);
+	sb->s_fs_info = sbi;
+	sb->s_flags |= SB_NODIRATIME;
+	sb->s_magic = EXFAT_SUPER_MAGIC;
+	sb->s_op = &exfat_sops;
+	sb->s_export_op = &exfat_export_ops;
+
+	error = parse_options(data, silent, &debug, &sbi->options);
+	if (error)
+		goto out_fail;
+
+	setup_dops(sb);
+
+	error = -EIO;
+	sb_min_blocksize(sb, 512);
+	sb->s_maxbytes = 0x7fffffffffffffffLL;    /* maximum file size */
+
+	ret = ffsMountVol(sb);
+	if (ret) {
+		if (!silent)
+			pr_err("[EXFAT] ffsMountVol failed\n");
+
+		goto out_fail;
+	}
+
+	/* set up enough so that it can read an inode */
+	exfat_hash_init(sb);
+
+	/*
+	 * The low byte of FAT's first entry must have same value with
+	 * media-field.  But in real world, too many devices is
+	 * writing wrong value.  So, removed that validity check.
+	 *
+	 * if (FAT_FIRST_ENT(sb, media) != first)
+	 */
+
+	/* codepage is not meaningful in exfat */
+	if (sbi->fs_info.vol_type != EXFAT) {
+		error = -EINVAL;
+		sprintf(buf, "cp%d", sbi->options.codepage);
+		sbi->nls_disk = load_nls(buf);
+		if (!sbi->nls_disk) {
+			pr_err("[EXFAT] Codepage %s not found\n", buf);
+			goto out_fail2;
+		}
+	}
+
+	sbi->nls_io = load_nls(sbi->options.iocharset);
+
+	error = -ENOMEM;
+	root_inode = new_inode(sb);
+	if (!root_inode)
+		goto out_fail2;
+	root_inode->i_ino = EXFAT_ROOT_INO;
+	SET_IVERSION(root_inode, 1);
+
+	error = exfat_read_root(root_inode);
+	if (error < 0)
+		goto out_fail2;
+	error = -ENOMEM;
+	exfat_attach(root_inode, EXFAT_I(root_inode)->i_pos);
+	insert_inode_hash(root_inode);
+	sb->s_root = d_make_root(root_inode);
+	if (!sb->s_root) {
+		pr_err("[EXFAT] Getting the root inode failed\n");
+		goto out_fail2;
+	}
+
+	return 0;
+
+out_fail2:
+	ffsUmountVol(sb);
+out_fail:
+	if (root_inode)
+		iput(root_inode);
+	sb->s_fs_info = NULL;
+	exfat_free_super(sbi);
+	return error;
+}
+
+static struct dentry *exfat_fs_mount(struct file_system_type *fs_type,
+				     int flags, const char *dev_name,
+				     void *data)
+{
+	return mount_bdev(fs_type, flags, dev_name, data, exfat_fill_super);
+}
+
+static void init_once(void *foo)
+{
+	struct exfat_inode_info *ei = (struct exfat_inode_info *)foo;
+
+	INIT_HLIST_NODE(&ei->i_hash_fat);
+	inode_init_once(&ei->vfs_inode);
+}
+
+static int __init exfat_init_inodecache(void)
+{
+	exfat_inode_cachep = kmem_cache_create("exfat_inode_cache",
+					       sizeof(struct exfat_inode_info),
+					       0,
+					       (SLAB_RECLAIM_ACCOUNT |
+						SLAB_MEM_SPREAD),
+					       init_once);
+	if (exfat_inode_cachep == NULL)
+		return -ENOMEM;
+	return 0;
+}
+
+static void __exit exfat_destroy_inodecache(void)
+{
+	/*
+	 * Make sure all delayed rcu free inodes are flushed before we
+	 * destroy cache.
+	 */
+	rcu_barrier();
+	kmem_cache_destroy(exfat_inode_cachep);
+}
+
+#ifdef CONFIG_EXFAT_KERNEL_DEBUG
+static void exfat_debug_kill_sb(struct super_block *sb)
+{
+	struct exfat_sb_info *sbi = EXFAT_SB(sb);
+	struct block_device *bdev = sb->s_bdev;
+	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+
+	long flags;
+
+	if (sbi) {
+		flags = sbi->debug_flags;
+
+		if (flags & EXFAT_DEBUGFLAGS_INVALID_UMOUNT) {
+			/*
+			 * invalidate_bdev drops all device cache include
+			 * dirty. We use this to simulate device removal.
+			 */
+			down(&p_fs->v_sem);
+			FAT_release_all(sb);
+			buf_release_all(sb);
+			up(&p_fs->v_sem);
+
+			invalidate_bdev(bdev);
+		}
+	}
+
+	kill_block_super(sb);
+}
+#endif /* CONFIG_EXFAT_KERNEL_DEBUG */
+
+static struct file_system_type exfat_fs_type = {
+	.owner       = THIS_MODULE,
+	.name        = "exfat",
+	.mount       = exfat_fs_mount,
+#ifdef CONFIG_EXFAT_KERNEL_DEBUG
+	.kill_sb    = exfat_debug_kill_sb,
+#else
+	.kill_sb    = kill_block_super,
+#endif /* CONFIG_EXFAT_KERNEL_DEBUG */
+	.fs_flags    = FS_REQUIRES_DEV,
+};
+
+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);
+	BUILD_BUG_ON(sizeof(struct bmap_dentry_t) != DENTRY_SIZE);
+	BUILD_BUG_ON(sizeof(struct case_dentry_t) != DENTRY_SIZE);
+	BUILD_BUG_ON(sizeof(struct volm_dentry_t) != DENTRY_SIZE);
+
+	pr_info("exFAT: Version %s\n", EXFAT_VERSION);
+
+	err = exfat_init_inodecache();
+	if (err)
+		return err;
+
+	err = register_filesystem(&exfat_fs_type);
+	if (err)
+		return err;
+
+	return 0;
+}
+
+static void __exit exit_exfat(void)
+{
+	exfat_destroy_inodecache();
+	unregister_filesystem(&exfat_fs_type);
+}
+
+module_init(init_exfat);
+module_exit(exit_exfat);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("exFAT Filesystem Driver");
+MODULE_ALIAS_FS("exfat");
diff --git a/drivers/staging/exfat/exfat_upcase.c b/drivers/staging/exfat/exfat_upcase.c
new file mode 100644
index 000000000000..366082fb3dab
--- /dev/null
+++ b/drivers/staging/exfat/exfat_upcase.c
@@ -0,0 +1,740 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *  Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
+ */
+
+#include <linux/types.h>
+#include "exfat.h"
+
+const u8 uni_upcase[NUM_UPCASE << 1] = {
+	0x00, 0x00, 0x01, 0x00, 0x02, 0x00, 0x03, 0x00,
+	0x04, 0x00, 0x05, 0x00, 0x06, 0x00, 0x07, 0x00,
+	0x08, 0x00, 0x09, 0x00, 0x0A, 0x00, 0x0B, 0x00,
+	0x0C, 0x00, 0x0D, 0x00, 0x0E, 0x00, 0x0F, 0x00,
+	0x10, 0x00, 0x11, 0x00, 0x12, 0x00, 0x13, 0x00,
+	0x14, 0x00, 0x15, 0x00, 0x16, 0x00, 0x17, 0x00,
+	0x18, 0x00, 0x19, 0x00, 0x1A, 0x00, 0x1B, 0x00,
+	0x1C, 0x00, 0x1D, 0x00, 0x1E, 0x00, 0x1F, 0x00,
+	0x20, 0x00, 0x21, 0x00, 0x22, 0x00, 0x23, 0x00,
+	0x24, 0x00, 0x25, 0x00, 0x26, 0x00, 0x27, 0x00,
+	0x28, 0x00, 0x29, 0x00, 0x2A, 0x00, 0x2B, 0x00,
+	0x2C, 0x00, 0x2D, 0x00, 0x2E, 0x00, 0x2F, 0x00,
+	0x30, 0x00, 0x31, 0x00, 0x32, 0x00, 0x33, 0x00,
+	0x34, 0x00, 0x35, 0x00, 0x36, 0x00, 0x37, 0x00,
+	0x38, 0x00, 0x39, 0x00, 0x3A, 0x00, 0x3B, 0x00,
+	0x3C, 0x00, 0x3D, 0x00, 0x3E, 0x00, 0x3F, 0x00,
+	0x40, 0x00, 0x41, 0x00, 0x42, 0x00, 0x43, 0x00,
+	0x44, 0x00, 0x45, 0x00, 0x46, 0x00, 0x47, 0x00,
+	0x48, 0x00, 0x49, 0x00, 0x4A, 0x00, 0x4B, 0x00,
+	0x4C, 0x00, 0x4D, 0x00, 0x4E, 0x00, 0x4F, 0x00,
+	0x50, 0x00, 0x51, 0x00, 0x52, 0x00, 0x53, 0x00,
+	0x54, 0x00, 0x55, 0x00, 0x56, 0x00, 0x57, 0x00,
+	0x58, 0x00, 0x59, 0x00, 0x5A, 0x00, 0x5B, 0x00,
+	0x5C, 0x00, 0x5D, 0x00, 0x5E, 0x00, 0x5F, 0x00,
+	0x60, 0x00, 0x41, 0x00, 0x42, 0x00, 0x43, 0x00,
+	0x44, 0x00, 0x45, 0x00, 0x46, 0x00, 0x47, 0x00,
+	0x48, 0x00, 0x49, 0x00, 0x4A, 0x00, 0x4B, 0x00,
+	0x4C, 0x00, 0x4D, 0x00, 0x4E, 0x00, 0x4F, 0x00,
+	0x50, 0x00, 0x51, 0x00, 0x52, 0x00, 0x53, 0x00,
+	0x54, 0x00, 0x55, 0x00, 0x56, 0x00, 0x57, 0x00,
+	0x58, 0x00, 0x59, 0x00, 0x5A, 0x00, 0x7B, 0x00,
+	0x7C, 0x00, 0x7D, 0x00, 0x7E, 0x00, 0x7F, 0x00,
+	0x80, 0x00, 0x81, 0x00, 0x82, 0x00, 0x83, 0x00,
+	0x84, 0x00, 0x85, 0x00, 0x86, 0x00, 0x87, 0x00,
+	0x88, 0x00, 0x89, 0x00, 0x8A, 0x00, 0x8B, 0x00,
+	0x8C, 0x00, 0x8D, 0x00, 0x8E, 0x00, 0x8F, 0x00,
+	0x90, 0x00, 0x91, 0x00, 0x92, 0x00, 0x93, 0x00,
+	0x94, 0x00, 0x95, 0x00, 0x96, 0x00, 0x97, 0x00,
+	0x98, 0x00, 0x99, 0x00, 0x9A, 0x00, 0x9B, 0x00,
+	0x9C, 0x00, 0x9D, 0x00, 0x9E, 0x00, 0x9F, 0x00,
+	0xA0, 0x00, 0xA1, 0x00, 0xA2, 0x00, 0xA3, 0x00,
+	0xA4, 0x00, 0xA5, 0x00, 0xA6, 0x00, 0xA7, 0x00,
+	0xA8, 0x00, 0xA9, 0x00, 0xAA, 0x00, 0xAB, 0x00,
+	0xAC, 0x00, 0xAD, 0x00, 0xAE, 0x00, 0xAF, 0x00,
+	0xB0, 0x00, 0xB1, 0x00, 0xB2, 0x00, 0xB3, 0x00,
+	0xB4, 0x00, 0xB5, 0x00, 0xB6, 0x00, 0xB7, 0x00,
+	0xB8, 0x00, 0xB9, 0x00, 0xBA, 0x00, 0xBB, 0x00,
+	0xBC, 0x00, 0xBD, 0x00, 0xBE, 0x00, 0xBF, 0x00,
+	0xC0, 0x00, 0xC1, 0x00, 0xC2, 0x00, 0xC3, 0x00,
+	0xC4, 0x00, 0xC5, 0x00, 0xC6, 0x00, 0xC7, 0x00,
+	0xC8, 0x00, 0xC9, 0x00, 0xCA, 0x00, 0xCB, 0x00,
+	0xCC, 0x00, 0xCD, 0x00, 0xCE, 0x00, 0xCF, 0x00,
+	0xD0, 0x00, 0xD1, 0x00, 0xD2, 0x00, 0xD3, 0x00,
+	0xD4, 0x00, 0xD5, 0x00, 0xD6, 0x00, 0xD7, 0x00,
+	0xD8, 0x00, 0xD9, 0x00, 0xDA, 0x00, 0xDB, 0x00,
+	0xDC, 0x00, 0xDD, 0x00, 0xDE, 0x00, 0xDF, 0x00,
+	0xC0, 0x00, 0xC1, 0x00, 0xC2, 0x00, 0xC3, 0x00,
+	0xC4, 0x00, 0xC5, 0x00, 0xC6, 0x00, 0xC7, 0x00,
+	0xC8, 0x00, 0xC9, 0x00, 0xCA, 0x00, 0xCB, 0x00,
+	0xCC, 0x00, 0xCD, 0x00, 0xCE, 0x00, 0xCF, 0x00,
+	0xD0, 0x00, 0xD1, 0x00, 0xD2, 0x00, 0xD3, 0x00,
+	0xD4, 0x00, 0xD5, 0x00, 0xD6, 0x00, 0xF7, 0x00,
+	0xD8, 0x00, 0xD9, 0x00, 0xDA, 0x00, 0xDB, 0x00,
+	0xDC, 0x00, 0xDD, 0x00, 0xDE, 0x00, 0x78, 0x01,
+	0x00, 0x01, 0x00, 0x01, 0x02, 0x01, 0x02, 0x01,
+	0x04, 0x01, 0x04, 0x01, 0x06, 0x01, 0x06, 0x01,
+	0x08, 0x01, 0x08, 0x01, 0x0A, 0x01, 0x0A, 0x01,
+	0x0C, 0x01, 0x0C, 0x01, 0x0E, 0x01, 0x0E, 0x01,
+	0x10, 0x01, 0x10, 0x01, 0x12, 0x01, 0x12, 0x01,
+	0x14, 0x01, 0x14, 0x01, 0x16, 0x01, 0x16, 0x01,
+	0x18, 0x01, 0x18, 0x01, 0x1A, 0x01, 0x1A, 0x01,
+	0x1C, 0x01, 0x1C, 0x01, 0x1E, 0x01, 0x1E, 0x01,
+	0x20, 0x01, 0x20, 0x01, 0x22, 0x01, 0x22, 0x01,
+	0x24, 0x01, 0x24, 0x01, 0x26, 0x01, 0x26, 0x01,
+	0x28, 0x01, 0x28, 0x01, 0x2A, 0x01, 0x2A, 0x01,
+	0x2C, 0x01, 0x2C, 0x01, 0x2E, 0x01, 0x2E, 0x01,
+	0x30, 0x01, 0x31, 0x01, 0x32, 0x01, 0x32, 0x01,
+	0x34, 0x01, 0x34, 0x01, 0x36, 0x01, 0x36, 0x01,
+	0x38, 0x01, 0x39, 0x01, 0x39, 0x01, 0x3B, 0x01,
+	0x3B, 0x01, 0x3D, 0x01, 0x3D, 0x01, 0x3F, 0x01,
+	0x3F, 0x01, 0x41, 0x01, 0x41, 0x01, 0x43, 0x01,
+	0x43, 0x01, 0x45, 0x01, 0x45, 0x01, 0x47, 0x01,
+	0x47, 0x01, 0x49, 0x01, 0x4A, 0x01, 0x4A, 0x01,
+	0x4C, 0x01, 0x4C, 0x01, 0x4E, 0x01, 0x4E, 0x01,
+	0x50, 0x01, 0x50, 0x01, 0x52, 0x01, 0x52, 0x01,
+	0x54, 0x01, 0x54, 0x01, 0x56, 0x01, 0x56, 0x01,
+	0x58, 0x01, 0x58, 0x01, 0x5A, 0x01, 0x5A, 0x01,
+	0x5C, 0x01, 0x5C, 0x01, 0x5E, 0x01, 0x5E, 0x01,
+	0x60, 0x01, 0x60, 0x01, 0x62, 0x01, 0x62, 0x01,
+	0x64, 0x01, 0x64, 0x01, 0x66, 0x01, 0x66, 0x01,
+	0x68, 0x01, 0x68, 0x01, 0x6A, 0x01, 0x6A, 0x01,
+	0x6C, 0x01, 0x6C, 0x01, 0x6E, 0x01, 0x6E, 0x01,
+	0x70, 0x01, 0x70, 0x01, 0x72, 0x01, 0x72, 0x01,
+	0x74, 0x01, 0x74, 0x01, 0x76, 0x01, 0x76, 0x01,
+	0x78, 0x01, 0x79, 0x01, 0x79, 0x01, 0x7B, 0x01,
+	0x7B, 0x01, 0x7D, 0x01, 0x7D, 0x01, 0x7F, 0x01,
+	0x43, 0x02, 0x81, 0x01, 0x82, 0x01, 0x82, 0x01,
+	0x84, 0x01, 0x84, 0x01, 0x86, 0x01, 0x87, 0x01,
+	0x87, 0x01, 0x89, 0x01, 0x8A, 0x01, 0x8B, 0x01,
+	0x8B, 0x01, 0x8D, 0x01, 0x8E, 0x01, 0x8F, 0x01,
+	0x90, 0x01, 0x91, 0x01, 0x91, 0x01, 0x93, 0x01,
+	0x94, 0x01, 0xF6, 0x01, 0x96, 0x01, 0x97, 0x01,
+	0x98, 0x01, 0x98, 0x01, 0x3D, 0x02, 0x9B, 0x01,
+	0x9C, 0x01, 0x9D, 0x01, 0x20, 0x02, 0x9F, 0x01,
+	0xA0, 0x01, 0xA0, 0x01, 0xA2, 0x01, 0xA2, 0x01,
+	0xA4, 0x01, 0xA4, 0x01, 0xA6, 0x01, 0xA7, 0x01,
+	0xA7, 0x01, 0xA9, 0x01, 0xAA, 0x01, 0xAB, 0x01,
+	0xAC, 0x01, 0xAC, 0x01, 0xAE, 0x01, 0xAF, 0x01,
+	0xAF, 0x01, 0xB1, 0x01, 0xB2, 0x01, 0xB3, 0x01,
+	0xB3, 0x01, 0xB5, 0x01, 0xB5, 0x01, 0xB7, 0x01,
+	0xB8, 0x01, 0xB8, 0x01, 0xBA, 0x01, 0xBB, 0x01,
+	0xBC, 0x01, 0xBC, 0x01, 0xBE, 0x01, 0xF7, 0x01,
+	0xC0, 0x01, 0xC1, 0x01, 0xC2, 0x01, 0xC3, 0x01,
+	0xC4, 0x01, 0xC5, 0x01, 0xC4, 0x01, 0xC7, 0x01,
+	0xC8, 0x01, 0xC7, 0x01, 0xCA, 0x01, 0xCB, 0x01,
+	0xCA, 0x01, 0xCD, 0x01, 0xCD, 0x01, 0xCF, 0x01,
+	0xCF, 0x01, 0xD1, 0x01, 0xD1, 0x01, 0xD3, 0x01,
+	0xD3, 0x01, 0xD5, 0x01, 0xD5, 0x01, 0xD7, 0x01,
+	0xD7, 0x01, 0xD9, 0x01, 0xD9, 0x01, 0xDB, 0x01,
+	0xDB, 0x01, 0x8E, 0x01, 0xDE, 0x01, 0xDE, 0x01,
+	0xE0, 0x01, 0xE0, 0x01, 0xE2, 0x01, 0xE2, 0x01,
+	0xE4, 0x01, 0xE4, 0x01, 0xE6, 0x01, 0xE6, 0x01,
+	0xE8, 0x01, 0xE8, 0x01, 0xEA, 0x01, 0xEA, 0x01,
+	0xEC, 0x01, 0xEC, 0x01, 0xEE, 0x01, 0xEE, 0x01,
+	0xF0, 0x01, 0xF1, 0x01, 0xF2, 0x01, 0xF1, 0x01,
+	0xF4, 0x01, 0xF4, 0x01, 0xF6, 0x01, 0xF7, 0x01,
+	0xF8, 0x01, 0xF8, 0x01, 0xFA, 0x01, 0xFA, 0x01,
+	0xFC, 0x01, 0xFC, 0x01, 0xFE, 0x01, 0xFE, 0x01,
+	0x00, 0x02, 0x00, 0x02, 0x02, 0x02, 0x02, 0x02,
+	0x04, 0x02, 0x04, 0x02, 0x06, 0x02, 0x06, 0x02,
+	0x08, 0x02, 0x08, 0x02, 0x0A, 0x02, 0x0A, 0x02,
+	0x0C, 0x02, 0x0C, 0x02, 0x0E, 0x02, 0x0E, 0x02,
+	0x10, 0x02, 0x10, 0x02, 0x12, 0x02, 0x12, 0x02,
+	0x14, 0x02, 0x14, 0x02, 0x16, 0x02, 0x16, 0x02,
+	0x18, 0x02, 0x18, 0x02, 0x1A, 0x02, 0x1A, 0x02,
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+	0xF6, 0x17, 0x63, 0x2C, 0x7E, 0x1D, 0x7F, 0x1D,
+	0x80, 0x1D, 0x81, 0x1D, 0x82, 0x1D, 0x83, 0x1D,
+	0x84, 0x1D, 0x85, 0x1D, 0x86, 0x1D, 0x87, 0x1D,
+	0x88, 0x1D, 0x89, 0x1D, 0x8A, 0x1D, 0x8B, 0x1D,
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+	0x90, 0x1D, 0x91, 0x1D, 0x92, 0x1D, 0x93, 0x1D,
+	0x94, 0x1D, 0x95, 0x1D, 0x96, 0x1D, 0x97, 0x1D,
+	0x98, 0x1D, 0x99, 0x1D, 0x9A, 0x1D, 0x9B, 0x1D,
+	0x9C, 0x1D, 0x9D, 0x1D, 0x9E, 0x1D, 0x9F, 0x1D,
+	0xA0, 0x1D, 0xA1, 0x1D, 0xA2, 0x1D, 0xA3, 0x1D,
+	0xA4, 0x1D, 0xA5, 0x1D, 0xA6, 0x1D, 0xA7, 0x1D,
+	0xA8, 0x1D, 0xA9, 0x1D, 0xAA, 0x1D, 0xAB, 0x1D,
+	0xAC, 0x1D, 0xAD, 0x1D, 0xAE, 0x1D, 0xAF, 0x1D,
+	0xB0, 0x1D, 0xB1, 0x1D, 0xB2, 0x1D, 0xB3, 0x1D,
+	0xB4, 0x1D, 0xB5, 0x1D, 0xB6, 0x1D, 0xB7, 0x1D,
+	0xB8, 0x1D, 0xB9, 0x1D, 0xBA, 0x1D, 0xBB, 0x1D,
+	0xBC, 0x1D, 0xBD, 0x1D, 0xBE, 0x1D, 0xBF, 0x1D,
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+	0xC4, 0x1D, 0xC5, 0x1D, 0xC6, 0x1D, 0xC7, 0x1D,
+	0xC8, 0x1D, 0xC9, 0x1D, 0xCA, 0x1D, 0xCB, 0x1D,
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+	0xA4, 0x1E, 0xA4, 0x1E, 0xA6, 0x1E, 0xA6, 0x1E,
+	0xA8, 0x1E, 0xA8, 0x1E, 0xAA, 0x1E, 0xAA, 0x1E,
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+	0xAC, 0x1F, 0xAD, 0x1F, 0xAE, 0x1F, 0xAF, 0x1F,
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+	0xB4, 0x1F, 0xB5, 0x1F, 0xB6, 0x1F, 0xB7, 0x1F,
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+	0xF4, 0x1F, 0xF5, 0x1F, 0xF6, 0x1F, 0xF7, 0x1F,
+	0xF8, 0x1F, 0xF9, 0x1F, 0xFA, 0x1F, 0xFB, 0x1F,
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+	0x98, 0x20, 0x99, 0x20, 0x9A, 0x20, 0x9B, 0x20,
+	0x9C, 0x20, 0x9D, 0x20, 0x9E, 0x20, 0x9F, 0x20,
+	0xA0, 0x20, 0xA1, 0x20, 0xA2, 0x20, 0xA3, 0x20,
+	0xA4, 0x20, 0xA5, 0x20, 0xA6, 0x20, 0xA7, 0x20,
+	0xA8, 0x20, 0xA9, 0x20, 0xAA, 0x20, 0xAB, 0x20,
+	0xAC, 0x20, 0xAD, 0x20, 0xAE, 0x20, 0xAF, 0x20,
+	0xB0, 0x20, 0xB1, 0x20, 0xB2, 0x20, 0xB3, 0x20,
+	0xB4, 0x20, 0xB5, 0x20, 0xB6, 0x20, 0xB7, 0x20,
+	0xB8, 0x20, 0xB9, 0x20, 0xBA, 0x20, 0xBB, 0x20,
+	0xBC, 0x20, 0xBD, 0x20, 0xBE, 0x20, 0xBF, 0x20,
+	0xC0, 0x20, 0xC1, 0x20, 0xC2, 0x20, 0xC3, 0x20,
+	0xC4, 0x20, 0xC5, 0x20, 0xC6, 0x20, 0xC7, 0x20,
+	0xC8, 0x20, 0xC9, 0x20, 0xCA, 0x20, 0xCB, 0x20,
+	0xCC, 0x20, 0xCD, 0x20, 0xCE, 0x20, 0xCF, 0x20,
+	0xD0, 0x20, 0xD1, 0x20, 0xD2, 0x20, 0xD3, 0x20,
+	0xD4, 0x20, 0xD5, 0x20, 0xD6, 0x20, 0xD7, 0x20,
+	0xD8, 0x20, 0xD9, 0x20, 0xDA, 0x20, 0xDB, 0x20,
+	0xDC, 0x20, 0xDD, 0x20, 0xDE, 0x20, 0xDF, 0x20,
+	0xE0, 0x20, 0xE1, 0x20, 0xE2, 0x20, 0xE3, 0x20,
+	0xE4, 0x20, 0xE5, 0x20, 0xE6, 0x20, 0xE7, 0x20,
+	0xE8, 0x20, 0xE9, 0x20, 0xEA, 0x20, 0xEB, 0x20,
+	0xEC, 0x20, 0xED, 0x20, 0xEE, 0x20, 0xEF, 0x20,
+	0xF0, 0x20, 0xF1, 0x20, 0xF2, 0x20, 0xF3, 0x20,
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+	0xFC, 0x20, 0xFD, 0x20, 0xFE, 0x20, 0xFF, 0x20,
+	0x00, 0x21, 0x01, 0x21, 0x02, 0x21, 0x03, 0x21,
+	0x04, 0x21, 0x05, 0x21, 0x06, 0x21, 0x07, 0x21,
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+	0x28, 0x21, 0x29, 0x21, 0x2A, 0x21, 0x2B, 0x21,
+	0x2C, 0x21, 0x2D, 0x21, 0x2E, 0x21, 0x2F, 0x21,
+	0x30, 0x21, 0x31, 0x21, 0x32, 0x21, 0x33, 0x21,
+	0x34, 0x21, 0x35, 0x21, 0x36, 0x21, 0x37, 0x21,
+	0x38, 0x21, 0x39, 0x21, 0x3A, 0x21, 0x3B, 0x21,
+	0x3C, 0x21, 0x3D, 0x21, 0x3E, 0x21, 0x3F, 0x21,
+	0x40, 0x21, 0x41, 0x21, 0x42, 0x21, 0x43, 0x21,
+	0x44, 0x21, 0x45, 0x21, 0x46, 0x21, 0x47, 0x21,
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+	0x50, 0x21, 0x51, 0x21, 0x52, 0x21, 0x53, 0x21,
+	0x54, 0x21, 0x55, 0x21, 0x56, 0x21, 0x57, 0x21,
+	0x58, 0x21, 0x59, 0x21, 0x5A, 0x21, 0x5B, 0x21,
+	0x5C, 0x21, 0x5D, 0x21, 0x5E, 0x21, 0x5F, 0x21,
+	0x60, 0x21, 0x61, 0x21, 0x62, 0x21, 0x63, 0x21,
+	0x64, 0x21, 0x65, 0x21, 0x66, 0x21, 0x67, 0x21,
+	0x68, 0x21, 0x69, 0x21, 0x6A, 0x21, 0x6B, 0x21,
+	0x6C, 0x21, 0x6D, 0x21, 0x6E, 0x21, 0x6F, 0x21,
+	0x60, 0x21, 0x61, 0x21, 0x62, 0x21, 0x63, 0x21,
+	0x64, 0x21, 0x65, 0x21, 0x66, 0x21, 0x67, 0x21,
+	0x68, 0x21, 0x69, 0x21, 0x6A, 0x21, 0x6B, 0x21,
+	0x6C, 0x21, 0x6D, 0x21, 0x6E, 0x21, 0x6F, 0x21,
+	0x80, 0x21, 0x81, 0x21, 0x82, 0x21, 0x83, 0x21,
+	0x83, 0x21, 0xFF, 0xFF, 0x4B, 0x03, 0xB6, 0x24,
+	0xB7, 0x24, 0xB8, 0x24, 0xB9, 0x24, 0xBA, 0x24,
+	0xBB, 0x24, 0xBC, 0x24, 0xBD, 0x24, 0xBE, 0x24,
+	0xBF, 0x24, 0xC0, 0x24, 0xC1, 0x24, 0xC2, 0x24,
+	0xC3, 0x24, 0xC4, 0x24, 0xC5, 0x24, 0xC6, 0x24,
+	0xC7, 0x24, 0xC8, 0x24, 0xC9, 0x24, 0xCA, 0x24,
+	0xCB, 0x24, 0xCC, 0x24, 0xCD, 0x24, 0xCE, 0x24,
+	0xCF, 0x24, 0xFF, 0xFF, 0x46, 0x07, 0x00, 0x2C,
+	0x01, 0x2C, 0x02, 0x2C, 0x03, 0x2C, 0x04, 0x2C,
+	0x05, 0x2C, 0x06, 0x2C, 0x07, 0x2C, 0x08, 0x2C,
+	0x09, 0x2C, 0x0A, 0x2C, 0x0B, 0x2C, 0x0C, 0x2C,
+	0x0D, 0x2C, 0x0E, 0x2C, 0x0F, 0x2C, 0x10, 0x2C,
+	0x11, 0x2C, 0x12, 0x2C, 0x13, 0x2C, 0x14, 0x2C,
+	0x15, 0x2C, 0x16, 0x2C, 0x17, 0x2C, 0x18, 0x2C,
+	0x19, 0x2C, 0x1A, 0x2C, 0x1B, 0x2C, 0x1C, 0x2C,
+	0x1D, 0x2C, 0x1E, 0x2C, 0x1F, 0x2C, 0x20, 0x2C,
+	0x21, 0x2C, 0x22, 0x2C, 0x23, 0x2C, 0x24, 0x2C,
+	0x25, 0x2C, 0x26, 0x2C, 0x27, 0x2C, 0x28, 0x2C,
+	0x29, 0x2C, 0x2A, 0x2C, 0x2B, 0x2C, 0x2C, 0x2C,
+	0x2D, 0x2C, 0x2E, 0x2C, 0x5F, 0x2C, 0x60, 0x2C,
+	0x60, 0x2C, 0x62, 0x2C, 0x63, 0x2C, 0x64, 0x2C,
+	0x65, 0x2C, 0x66, 0x2C, 0x67, 0x2C, 0x67, 0x2C,
+	0x69, 0x2C, 0x69, 0x2C, 0x6B, 0x2C, 0x6B, 0x2C,
+	0x6D, 0x2C, 0x6E, 0x2C, 0x6F, 0x2C, 0x70, 0x2C,
+	0x71, 0x2C, 0x72, 0x2C, 0x73, 0x2C, 0x74, 0x2C,
+	0x75, 0x2C, 0x75, 0x2C, 0x77, 0x2C, 0x78, 0x2C,
+	0x79, 0x2C, 0x7A, 0x2C, 0x7B, 0x2C, 0x7C, 0x2C,
+	0x7D, 0x2C, 0x7E, 0x2C, 0x7F, 0x2C, 0x80, 0x2C,
+	0x80, 0x2C, 0x82, 0x2C, 0x82, 0x2C, 0x84, 0x2C,
+	0x84, 0x2C, 0x86, 0x2C, 0x86, 0x2C, 0x88, 0x2C,
+	0x88, 0x2C, 0x8A, 0x2C, 0x8A, 0x2C, 0x8C, 0x2C,
+	0x8C, 0x2C, 0x8E, 0x2C, 0x8E, 0x2C, 0x90, 0x2C,
+	0x90, 0x2C, 0x92, 0x2C, 0x92, 0x2C, 0x94, 0x2C,
+	0x94, 0x2C, 0x96, 0x2C, 0x96, 0x2C, 0x98, 0x2C,
+	0x98, 0x2C, 0x9A, 0x2C, 0x9A, 0x2C, 0x9C, 0x2C,
+	0x9C, 0x2C, 0x9E, 0x2C, 0x9E, 0x2C, 0xA0, 0x2C,
+	0xA0, 0x2C, 0xA2, 0x2C, 0xA2, 0x2C, 0xA4, 0x2C,
+	0xA4, 0x2C, 0xA6, 0x2C, 0xA6, 0x2C, 0xA8, 0x2C,
+	0xA8, 0x2C, 0xAA, 0x2C, 0xAA, 0x2C, 0xAC, 0x2C,
+	0xAC, 0x2C, 0xAE, 0x2C, 0xAE, 0x2C, 0xB0, 0x2C,
+	0xB0, 0x2C, 0xB2, 0x2C, 0xB2, 0x2C, 0xB4, 0x2C,
+	0xB4, 0x2C, 0xB6, 0x2C, 0xB6, 0x2C, 0xB8, 0x2C,
+	0xB8, 0x2C, 0xBA, 0x2C, 0xBA, 0x2C, 0xBC, 0x2C,
+	0xBC, 0x2C, 0xBE, 0x2C, 0xBE, 0x2C, 0xC0, 0x2C,
+	0xC0, 0x2C, 0xC2, 0x2C, 0xC2, 0x2C, 0xC4, 0x2C,
+	0xC4, 0x2C, 0xC6, 0x2C, 0xC6, 0x2C, 0xC8, 0x2C,
+	0xC8, 0x2C, 0xCA, 0x2C, 0xCA, 0x2C, 0xCC, 0x2C,
+	0xCC, 0x2C, 0xCE, 0x2C, 0xCE, 0x2C, 0xD0, 0x2C,
+	0xD0, 0x2C, 0xD2, 0x2C, 0xD2, 0x2C, 0xD4, 0x2C,
+	0xD4, 0x2C, 0xD6, 0x2C, 0xD6, 0x2C, 0xD8, 0x2C,
+	0xD8, 0x2C, 0xDA, 0x2C, 0xDA, 0x2C, 0xDC, 0x2C,
+	0xDC, 0x2C, 0xDE, 0x2C, 0xDE, 0x2C, 0xE0, 0x2C,
+	0xE0, 0x2C, 0xE2, 0x2C, 0xE2, 0x2C, 0xE4, 0x2C,
+	0xE5, 0x2C, 0xE6, 0x2C, 0xE7, 0x2C, 0xE8, 0x2C,
+	0xE9, 0x2C, 0xEA, 0x2C, 0xEB, 0x2C, 0xEC, 0x2C,
+	0xED, 0x2C, 0xEE, 0x2C, 0xEF, 0x2C, 0xF0, 0x2C,
+	0xF1, 0x2C, 0xF2, 0x2C, 0xF3, 0x2C, 0xF4, 0x2C,
+	0xF5, 0x2C, 0xF6, 0x2C, 0xF7, 0x2C, 0xF8, 0x2C,
+	0xF9, 0x2C, 0xFA, 0x2C, 0xFB, 0x2C, 0xFC, 0x2C,
+	0xFD, 0x2C, 0xFE, 0x2C, 0xFF, 0x2C, 0xA0, 0x10,
+	0xA1, 0x10, 0xA2, 0x10, 0xA3, 0x10, 0xA4, 0x10,
+	0xA5, 0x10, 0xA6, 0x10, 0xA7, 0x10, 0xA8, 0x10,
+	0xA9, 0x10, 0xAA, 0x10, 0xAB, 0x10, 0xAC, 0x10,
+	0xAD, 0x10, 0xAE, 0x10, 0xAF, 0x10, 0xB0, 0x10,
+	0xB1, 0x10, 0xB2, 0x10, 0xB3, 0x10, 0xB4, 0x10,
+	0xB5, 0x10, 0xB6, 0x10, 0xB7, 0x10, 0xB8, 0x10,
+	0xB9, 0x10, 0xBA, 0x10, 0xBB, 0x10, 0xBC, 0x10,
+	0xBD, 0x10, 0xBE, 0x10, 0xBF, 0x10, 0xC0, 0x10,
+	0xC1, 0x10, 0xC2, 0x10, 0xC3, 0x10, 0xC4, 0x10,
+	0xC5, 0x10, 0xFF, 0xFF, 0x1B, 0xD2, 0x21, 0xFF,
+	0x22, 0xFF, 0x23, 0xFF, 0x24, 0xFF, 0x25, 0xFF,
+	0x26, 0xFF, 0x27, 0xFF, 0x28, 0xFF, 0x29, 0xFF,
+	0x2A, 0xFF, 0x2B, 0xFF, 0x2C, 0xFF, 0x2D, 0xFF,
+	0x2E, 0xFF, 0x2F, 0xFF, 0x30, 0xFF, 0x31, 0xFF,
+	0x32, 0xFF, 0x33, 0xFF, 0x34, 0xFF, 0x35, 0xFF,
+	0x36, 0xFF, 0x37, 0xFF, 0x38, 0xFF, 0x39, 0xFF,
+	0x3A, 0xFF, 0x5B, 0xFF, 0x5C, 0xFF, 0x5D, 0xFF,
+	0x5E, 0xFF, 0x5F, 0xFF, 0x60, 0xFF, 0x61, 0xFF,
+	0x62, 0xFF, 0x63, 0xFF, 0x64, 0xFF, 0x65, 0xFF,
+	0x66, 0xFF, 0x67, 0xFF, 0x68, 0xFF, 0x69, 0xFF,
+	0x6A, 0xFF, 0x6B, 0xFF, 0x6C, 0xFF, 0x6D, 0xFF,
+	0x6E, 0xFF, 0x6F, 0xFF, 0x70, 0xFF, 0x71, 0xFF,
+	0x72, 0xFF, 0x73, 0xFF, 0x74, 0xFF, 0x75, 0xFF,
+	0x76, 0xFF, 0x77, 0xFF, 0x78, 0xFF, 0x79, 0xFF,
+	0x7A, 0xFF, 0x7B, 0xFF, 0x7C, 0xFF, 0x7D, 0xFF,
+	0x7E, 0xFF, 0x7F, 0xFF, 0x80, 0xFF, 0x81, 0xFF,
+	0x82, 0xFF, 0x83, 0xFF, 0x84, 0xFF, 0x85, 0xFF,
+	0x86, 0xFF, 0x87, 0xFF, 0x88, 0xFF, 0x89, 0xFF,
+	0x8A, 0xFF, 0x8B, 0xFF, 0x8C, 0xFF, 0x8D, 0xFF,
+	0x8E, 0xFF, 0x8F, 0xFF, 0x90, 0xFF, 0x91, 0xFF,
+	0x92, 0xFF, 0x93, 0xFF, 0x94, 0xFF, 0x95, 0xFF,
+	0x96, 0xFF, 0x97, 0xFF, 0x98, 0xFF, 0x99, 0xFF,
+	0x9A, 0xFF, 0x9B, 0xFF, 0x9C, 0xFF, 0x9D, 0xFF,
+	0x9E, 0xFF, 0x9F, 0xFF, 0xA0, 0xFF, 0xA1, 0xFF,
+	0xA2, 0xFF, 0xA3, 0xFF, 0xA4, 0xFF, 0xA5, 0xFF,
+	0xA6, 0xFF, 0xA7, 0xFF, 0xA8, 0xFF, 0xA9, 0xFF,
+	0xAA, 0xFF, 0xAB, 0xFF, 0xAC, 0xFF, 0xAD, 0xFF,
+	0xAE, 0xFF, 0xAF, 0xFF, 0xB0, 0xFF, 0xB1, 0xFF,
+	0xB2, 0xFF, 0xB3, 0xFF, 0xB4, 0xFF, 0xB5, 0xFF,
+	0xB6, 0xFF, 0xB7, 0xFF, 0xB8, 0xFF, 0xB9, 0xFF,
+	0xBA, 0xFF, 0xBB, 0xFF, 0xBC, 0xFF, 0xBD, 0xFF,
+	0xBE, 0xFF, 0xBF, 0xFF, 0xC0, 0xFF, 0xC1, 0xFF,
+	0xC2, 0xFF, 0xC3, 0xFF, 0xC4, 0xFF, 0xC5, 0xFF,
+	0xC6, 0xFF, 0xC7, 0xFF, 0xC8, 0xFF, 0xC9, 0xFF,
+	0xCA, 0xFF, 0xCB, 0xFF, 0xCC, 0xFF, 0xCD, 0xFF,
+	0xCE, 0xFF, 0xCF, 0xFF, 0xD0, 0xFF, 0xD1, 0xFF,
+	0xD2, 0xFF, 0xD3, 0xFF, 0xD4, 0xFF, 0xD5, 0xFF,
+	0xD6, 0xFF, 0xD7, 0xFF, 0xD8, 0xFF, 0xD9, 0xFF,
+	0xDA, 0xFF, 0xDB, 0xFF, 0xDC, 0xFF, 0xDD, 0xFF,
+	0xDE, 0xFF, 0xDF, 0xFF, 0xE0, 0xFF, 0xE1, 0xFF,
+	0xE2, 0xFF, 0xE3, 0xFF, 0xE4, 0xFF, 0xE5, 0xFF,
+	0xE6, 0xFF, 0xE7, 0xFF, 0xE8, 0xFF, 0xE9, 0xFF,
+	0xEA, 0xFF, 0xEB, 0xFF, 0xEC, 0xFF, 0xED, 0xFF,
+	0xEE, 0xFF, 0xEF, 0xFF, 0xF0, 0xFF, 0xF1, 0xFF,
+	0xF2, 0xFF, 0xF3, 0xFF, 0xF4, 0xFF, 0xF5, 0xFF,
+	0xF6, 0xFF, 0xF7, 0xFF, 0xF8, 0xFF, 0xF9, 0xFF,
+	0xFA, 0xFF, 0xFB, 0xFF, 0xFC, 0xFF, 0xFD, 0xFF,
+	0xFE, 0xFF, 0xFF, 0xFF
+};
-- 
2.23.0


^ permalink raw reply	[flat|nested] 70+ messages in thread

end of thread, back to index

Thread overview: 70+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-08-28 16:08 [PATCH] staging: exfat: add exfat filesystem code to staging Greg Kroah-Hartman
2019-08-28 17:00 ` Greg Kroah-Hartman
2019-08-29  6:23   ` Christoph Hellwig
2019-08-29  6:39     ` Greg Kroah-Hartman
2019-08-29  9:41       ` Christoph Hellwig
2019-08-29  9:50         ` Greg Kroah-Hartman
2019-08-29 10:37           ` Christoph Hellwig
2019-08-29 11:04             ` Gao Xiang
2019-08-29 11:18               ` Greg Kroah-Hartman
2019-08-29 11:18             ` Greg Kroah-Hartman
2019-08-29 15:11               ` Dan Carpenter
2019-08-29 15:27                 ` Gao Xiang
2019-08-29 15:43                   ` Dan Carpenter
2019-08-29 15:51                     ` Gao Xiang
2019-08-29 16:04                       ` Gao Xiang
2019-08-30  8:34                         ` Dan Carpenter
2019-08-30  8:43                           ` Gao Xiang
2019-08-30 11:26                             ` Dan Carpenter
2019-08-30 12:04                               ` Gao Xiang
2019-08-29 16:44                     ` Gao Xiang
2019-08-29 16:59                       ` Joe Perches
2019-08-29 17:02                         ` Gao Xiang
2019-08-30  2:06                     ` Chao Yu
2019-08-30  6:38                       ` Gao Xiang
2019-08-30 12:00                         ` Checking usage of likeliness annotations Markus Elfring
2019-08-30 11:51                       ` [PATCH] staging: exfat: add exfat filesystem code to staging David Sterba
2019-08-31  3:50                         ` Chao Yu
2019-08-30 15:36               ` Christoph Hellwig
2019-08-30 21:54               ` Dave Chinner
2019-08-31 10:31                 ` Valdis Klētnieks
2019-09-01  0:04                   ` Dave Chinner
2019-08-29  7:01     ` Gao Xiang
2019-08-29  8:24       ` Gao Xiang
2019-08-29  9:51         ` Christoph Hellwig
2019-08-29 12:14 ` Pali Rohár
2019-08-29 12:34   ` Valdis Klētnieks
2019-08-29 12:46     ` Pali Rohár
2019-08-29 14:08 ` Markus Elfring
2019-08-29 15:44 ` Markus Elfring
2019-08-29 20:56 ` Pali Rohár
2019-08-29 23:18   ` Valdis Klētnieks
2019-08-29 23:35     ` Sasha Levin
2019-08-30  7:56       ` Pali Rohár
2019-10-16 14:03         ` Pali Rohár
2019-10-16 14:31           ` Sasha Levin
2019-10-16 16:03             ` Pali Rohár
2019-10-16 16:20               ` Sasha Levin
2019-10-16 16:22               ` Greg Kroah-Hartman
2019-10-16 16:32                 ` Pali Rohár
2019-10-16 16:50                   ` Greg Kroah-Hartman
2019-10-16 20:33               ` Sasha Levin
2019-10-16 21:53                 ` Valdis Klētnieks
2019-10-17  7:53                   ` Pali Rohár
2019-10-17  7:50                 ` Pali Rohár
2019-10-16 16:05             ` Valdis Klētnieks
2019-08-30  8:03     ` Pali Rohár
2019-08-30 15:40   ` Christoph Hellwig
2019-08-30 15:43     ` Pali Rohár
2019-09-14 13:39 ` [PATCH] staging: exfat: add exfat filesystem code to Park Ju Hyung
2019-09-15 13:54   ` Greg KH
2019-09-15 16:11     ` Ju Hyung Park
     [not found] ` <20190918195920.25210-1-qkrwngud825@gmail.com>
2019-09-18 20:12   ` [PATCH] staging: exfat: rebase to sdFAT v2.2.0 Greg KH
2019-09-18 20:13   ` Greg KH
2019-09-18 20:22     ` Ju Hyung Park
2019-09-18 20:26       ` Greg KH
2019-09-18 20:31         ` Ju Hyung Park
2019-09-18 20:46           ` Valdis Klētnieks
2019-09-18 21:31   ` kbuild test robot
2019-09-18 21:31   ` kbuild test robot
2019-09-18 22:17     ` Ju Hyung Park

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		linux-kernel@vger.kernel.org linux-kernel@archiver.kernel.org
	public-inbox-index lkml

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-kernel


AGPL code for this site: git clone https://public-inbox.org/ public-inbox