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exfat_fs.h
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exfat_fs.h
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
*/
#ifndef _EXFAT_FS_H
#define _EXFAT_FS_H
#include <linux/types.h>
#include <linux/magic.h>
#include <asm/byteorder.h>
#ifndef MSDOS_SUPER_MAGIC
#define MSDOS_SUPER_MAGIC 0x4d44 /* MD */
#endif
#ifndef EXFAT_SUPER_MAGIC
#define EXFAT_SUPER_MAGIC (0x2011BAB0UL)
#endif /* EXFAT_SUPER_MAGIC */
#ifndef EXFAT_SUPER_MAGIC
#define EXFAT_SUPER_MAGIC (0x5EC5DFA4UL)
#endif /* EXFAT_SUPER_MAGIC */
#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
/* directory file name */
#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
/* file name lengths */
/* NOTE :
* The maximum length of input or output is limited to 256 including NULL,
* But we allocate 4 extra bytes for utf8 translation reside in last position,
* because utf8 can uses memory upto 6 bytes per one character.
* Therefore, MAX_CHARSET_SIZE supports upto 6 bytes for utf8
*/
#define MAX_UNINAME_BUF_SIZE (((MAX_NAME_LENGTH+1)*2)+4)
#define MAX_DOSNAME_BUF_SIZE ((DOS_NAME_LENGTH+2)+6)
#define MAX_VFSNAME_BUF_SIZE ((MAX_NAME_LENGTH+1)*MAX_CHARSET_SIZE)
#define MAX_CHARSET_SIZE 6 // max size of multi-byte character
#define MAX_NAME_LENGTH 255 // max len of file name excluding NULL
#define DOS_NAME_LENGTH 11 // DOS file name length excluding NULL
#define SECTOR_SIZE_BITS 9 /* VFS sector size is 512 bytes */
#define DENTRY_SIZE 32 /* directory entry size */
#define DENTRY_SIZE_BITS 5
#define MAX_FAT_DENTRIES 65536 /* FAT allows 65536 directory entries */
#define MAX_EXFAT_DENTRIES 8388608 /* exFAT allows 8388608(256MB) directory entries */
/* 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
#define FAT_VOL_DIRTY 0x01
/* 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
/* dentry types */
#define MSDOS_DELETED 0xE5 /* deleted mark */
#define MSDOS_UNUSED 0x00 /* end of directory */
#define EXFAT_UNUSED 0x00 /* end of directory */
#define IS_EXFAT_DELETED(x) ((x) < 0x80) /* deleted file (0x01~0x7F) */
#define EXFAT_INVAL 0x80 /* invalid value */
#define EXFAT_BITMAP 0x81 /* allocation bitmap */
#define EXFAT_UPCASE 0x82 /* upcase table */
#define EXFAT_VOLUME 0x83 /* volume label */
#define EXFAT_FILE 0x85 /* file or dir */
#define EXFAT_STREAM 0xC0 /* stream entry */
#define EXFAT_NAME 0xC1 /* file name entry */
#define EXFAT_ACL 0xC2 /* stream entry */
/* specific flag */
#define MSDOS_LAST_LFN 0x40
/* 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 (ATTR_READONLY | ATTR_HIDDEN | ATTR_SYSTEM | \
ATTR_VOLUME) /* 0x000F */
#define ATTR_EXTEND_MASK (ATTR_EXTEND | ATTR_SUBDIR | ATTR_ARCHIVE)
#define ATTR_RWMASK (ATTR_HIDDEN | ATTR_SYSTEM | ATTR_VOLUME | \
ATTR_SUBDIR | ATTR_ARCHIVE | ATTR_SYMLINK)/* 0x007E */
/* file creation modes */
#define FM_REGULAR 0x00
#define FM_SYMLINK 0x40
/* 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
/*
* ioctl command
*/
#define EXFAT_IOCTL_GET_VOLUME_ID _IOR('r', 0x12, __u32)
/* FAT12/16 BIOS parameter block (64 bytes) */
typedef struct {
__u8 jmp_boot[3];
__u8 oem_name[8];
__u8 sect_size[2]; /* unaligned */
__u8 sect_per_clus;
__le16 num_reserved; /* . */
__u8 num_fats;
__u8 num_root_entries[2]; /* unaligned */
__u8 num_sectors[2]; /* unaligned */
__u8 media_type;
__le16 num_fat_sectors;
__le16 sectors_in_track;
__le16 num_heads;
__le32 num_hid_sectors; /* . */
__le32 num_huge_sectors;
__u8 phy_drv_no;
__u8 state; /* used by WindowsNT for mount state */
__u8 ext_signature;
__u8 vol_serial[4];
__u8 vol_label[11];
__u8 vol_type[8];
__le16 dummy;
} bpb16_t;
/* FAT32 BIOS parameter block (64 bytes) */
typedef struct {
__u8 jmp_boot[3];
__u8 oem_name[8];
__u8 sect_size[2]; /* unaligned */
__u8 sect_per_clus;
__le16 num_reserved;
__u8 num_fats;
__u8 num_root_entries[2]; /* unaligned */
__u8 num_sectors[2]; /* unaligned */
__u8 media_type;
__le16 num_fat_sectors; /* zero */
__le16 sectors_in_track;
__le16 num_heads;
__le32 num_hid_sectors; /* . */
__le32 num_huge_sectors;
__le32 num_fat32_sectors;
__le16 ext_flags;
__u8 fs_version[2];
__le32 root_cluster; /* . */
__le16 fsinfo_sector;
__le16 backup_sector;
__le16 reserved[6]; /* . */
} bpb32_t;
/* FAT32 EXTEND BIOS parameter block (32 bytes) */
typedef struct {
__u8 phy_drv_no;
__u8 state; /* used by WindowsNT for mount state */
__u8 ext_signature;
__u8 vol_serial[4];
__u8 vol_label[11];
__u8 vol_type[8];
__le16 dummy[3];
} bsx32_t;
/* EXFAT BIOS parameter block (64 bytes) */
typedef struct {
__u8 jmp_boot[3];
__u8 oem_name[8];
__u8 res_zero[53];
} bpb64_t;
/* EXFAT EXTEND BIOS parameter block (56 bytes) */
typedef struct {
__le64 vol_offset;
__le64 vol_length;
__le32 fat_offset;
__le32 fat_length;
__le32 clu_offset;
__le32 clu_count;
__le32 root_cluster;
__le32 vol_serial;
__u8 fs_version[2];
__le16 vol_flags;
__u8 sect_size_bits;
__u8 sect_per_clus_bits;
__u8 num_fats;
__u8 phy_drv_no;
__u8 perc_in_use;
__u8 reserved2[7];
} bsx64_t;
/* FAT32 PBR (64 bytes) */
typedef struct {
bpb16_t bpb;
} pbr16_t;
/* FAT32 PBR[BPB+BSX] (96 bytes) */
typedef struct {
bpb32_t bpb;
bsx32_t bsx;
} pbr32_t;
/* EXFAT PBR[BPB+BSX] (120 bytes) */
typedef struct {
bpb64_t bpb;
bsx64_t bsx;
} pbr64_t;
/* Common PBR[Partition Boot Record] (512 bytes) */
typedef struct {
union {
__u8 raw[64];
bpb16_t f16;
bpb32_t f32;
bpb64_t f64;
} bpb;
union {
__u8 raw[56];
bsx32_t f32;
bsx64_t f64;
} bsx;
__u8 boot_code[390];
__le16 signature;
} pbr_t;
/* FAT32 filesystem information sector (512 bytes) */
typedef struct {
__le32 signature1; // aligned
__u8 reserved1[480];
__le32 signature2; // aligned
__le32 free_cluster; // aligned
__le32 next_cluster; // aligned
__u8 reserved2[14];
__le16 signature3[2];
} fat32_fsi_t;
/* FAT directory entry (32 bytes) */
typedef struct {
__u8 dummy[32];
} DENTRY_T;
typedef struct {
__u8 name[DOS_NAME_LENGTH]; /* 11 chars */
__u8 attr;
__u8 lcase;
__u8 create_time_ms;
__le16 create_time; // aligned
__le16 create_date; // aligned
__le16 access_date; // aligned
__le16 start_clu_hi; // aligned
__le16 modify_time; // aligned
__le16 modify_date; // aligned
__le16 start_clu_lo; // aligned
__le32 size; // aligned
} DOS_DENTRY_T;
/* FAT extended directory entry (32 bytes) */
typedef struct {
__u8 order;
__u8 unicode_0_4[10];
__u8 attr;
__u8 sysid;
__u8 checksum;
__le16 unicode_5_10[6]; // aligned
__le16 start_clu; // aligned
__le16 unicode_11_12[2]; // aligned
} EXT_DENTRY_T;
/* EXFAT file directory entry (32 bytes) */
typedef struct {
__u8 type;
__u8 num_ext;
__le16 checksum; // aligned
__le16 attr; // aligned
__le16 reserved1;
__le16 create_time; // aligned
__le16 create_date; // aligned
__le16 modify_time; // aligned
__le16 modify_date; // aligned
__le16 access_time; // aligned
__le16 access_date; // aligned
__u8 create_time_ms;
__u8 modify_time_ms;
__u8 access_time_ms;
__u8 reserved2[9];
} FILE_DENTRY_T;
/* EXFAT stream extension directory entry (32 bytes) */
typedef struct {
__u8 type;
__u8 flags;
__u8 reserved1;
__u8 name_len;
__le16 name_hash; // aligned
__le16 reserved2;
__le64 valid_size; // aligned
__le32 reserved3; // aligned
__le32 start_clu; // aligned
__le64 size; // aligned
} STRM_DENTRY_T;
/* EXFAT file name directory entry (32 bytes) */
typedef struct {
__u8 type;
__u8 flags;
__le16 unicode_0_14[15]; // aligned
} NAME_DENTRY_T;
/* EXFAT allocation bitmap directory entry (32 bytes) */
typedef struct {
__u8 type;
__u8 flags;
__u8 reserved[18];
__le32 start_clu; // aligned
__le64 size; // aligned
} BMAP_DENTRY_T;
/* EXFAT up-case table directory entry (32 bytes) */
typedef struct {
__u8 type;
__u8 reserved1[3];
__le32 checksum; // aligned
__u8 reserved2[12];
__le32 start_clu; // aligned
__le64 size; // aligned
} CASE_DENTRY_T;
/* EXFAT volume label directory entry (32 bytes) */
typedef struct {
__u8 type;
__u8 label_len;
__le16 unicode_0_10[11]; // aligned
__u8 reserved[8];
} VOLM_DENTRY_T;
#endif /* _EXFAT_FS_H */