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Edit File : msdos_fs.h \| Size : 6.80 KB
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note / #ifndef _LINUX_MSDOS_FS_H #define _LINUX_MSDOS_FS_H #include <linux/types.h> #include <linux/magic.h> #include <asm/byteorder.h> / * The MS-DOS filesystem constants/structures / #ifndef SECTOR_SIZE #define SECTOR_SIZE 512 / sector size (bytes) / #endif #define SECTOR_BITS 9 / log2(SECTOR_SIZE) / #define MSDOS_DPB (MSDOS_DPS) / dir entries per block / #define MSDOS_DPB_BITS 4 / log2(MSDOS_DPB) / #define MSDOS_DPS (SECTOR_SIZE / sizeof(struct msdos_dir_entry)) #define MSDOS_DPS_BITS 4 / log2(MSDOS_DPS) / #define MSDOS_LONGNAME 256 / maximum name length / #define CF_LE_W(v) le16_to_cpu(v) #define CF_LE_L(v) le32_to_cpu(v) #define CT_LE_W(v) cpu_to_le16(v) #define CT_LE_L(v) cpu_to_le32(v) #define MSDOS_ROOT_INO 1 / The root inode number / #define MSDOS_FSINFO_INO 2 / Used for managing the FSINFO block / #define MSDOS_DIR_BITS 5 / log2(sizeof(struct msdos_dir_entry)) / / directory limit / #define FAT_MAX_DIR_ENTRIES (65536) #define FAT_MAX_DIR_SIZE (FAT_MAX_DIR_ENTRIES << MSDOS_DIR_BITS) #define ATTR_NONE 0 / no attribute bits / #define ATTR_RO 1 / read-only / #define ATTR_HIDDEN 2 / hidden / #define ATTR_SYS 4 / system / #define ATTR_VOLUME 8 / volume label / #define ATTR_DIR 16 / directory / #define ATTR_ARCH 32 / archived / / attribute bits that are copied "as is" / #define ATTR_UNUSED (ATTR_VOLUME \| ATTR_ARCH \| ATTR_SYS \| ATTR_HIDDEN) / bits that are used by the Windows 95/Windows NT extended FAT / #define ATTR_EXT (ATTR_RO \| ATTR_HIDDEN \| ATTR_SYS \| ATTR_VOLUME) #define CASE_LOWER_BASE 8 / base is lower case / #define CASE_LOWER_EXT 16 / extension is lower case / #define DELETED_FLAG 0xe5 / marks file as deleted when in name[0] / #define IS_FREE(n) (!(n) \|\| (n) == DELETED_FLAG) #define FAT_LFN_LEN 255 / maximum long name length / #define MSDOS_NAME 11 / maximum name length / #define MSDOS_SLOTS 21 / max # of slots for short and long names / #define MSDOS_DOT ". " / ".", padded to MSDOS_NAME chars / #define MSDOS_DOTDOT ".. " / "..", padded to MSDOS_NAME chars / #define FAT_FIRST_ENT(s, x) ((MSDOS_SB(s)->fat_bits == 32 ? 0x0FFFFF00 : \ MSDOS_SB(s)->fat_bits == 16 ? 0xFF00 : 0xF00) \| (x)) / start of data cluster's entry (number of reserved clusters) / #define FAT_START_ENT 2 / maximum number of clusters / #define MAX_FAT12 0xFF4 #define MAX_FAT16 0xFFF4 #define MAX_FAT32 0x0FFFFFF6 #define MAX_FAT(s) (MSDOS_SB(s)->fat_bits == 32 ? MAX_FAT32 : \ MSDOS_SB(s)->fat_bits == 16 ? MAX_FAT16 : MAX_FAT12) / bad cluster mark / #define BAD_FAT12 0xFF7 #define BAD_FAT16 0xFFF7 #define BAD_FAT32 0x0FFFFFF7 / standard EOF / #define EOF_FAT12 0xFFF #define EOF_FAT16 0xFFFF #define EOF_FAT32 0x0FFFFFFF #define FAT_ENT_FREE (0) #define FAT_ENT_BAD (BAD_FAT32) #define FAT_ENT_EOF (EOF_FAT32) #define FAT_FSINFO_SIG1 0x41615252 #define FAT_FSINFO_SIG2 0x61417272 #define IS_FSINFO(x) (le32_to_cpu((x)->signature1) == FAT_FSINFO_SIG1 \ && le32_to_cpu((x)->signature2) == FAT_FSINFO_SIG2) #define FAT_STATE_DIRTY 0x01 struct __fat_dirent { long d_ino; __kernel_off_t d_off; unsigned short d_reclen; char d_name[256]; / We must not include limits.h! / }; / * ioctl commands / #define VFAT_IOCTL_READDIR_BOTH _IOR('r', 1, struct __fat_dirent[2]) #define VFAT_IOCTL_READDIR_SHORT _IOR('r', 2, struct __fat_dirent[2]) / <linux/videotext.h> has used 0x72 ('r') in collision, so skip a few / #define FAT_IOCTL_GET_ATTRIBUTES _IOR('r', 0x10, __u32) #define FAT_IOCTL_SET_ATTRIBUTES _IOW('r', 0x11, __u32) /Android kernel has used 0x12, so we use 0x13/ #define FAT_IOCTL_GET_VOLUME_ID _IOR('r', 0x13, __u32) struct fat_boot_sector { __u8 ignored[3]; / Boot strap short or near jump / __u8 system_id[8]; / Name - can be used to special case partition manager volumes / __u8 sector_size[2]; / bytes per logical sector / __u8 sec_per_clus; / sectors/cluster / __le16 reserved; / reserved sectors / __u8 fats; / number of FATs / __u8 dir_entries[2]; / root directory entries / __u8 sectors[2]; / number of sectors / __u8 media; / media code / __le16 fat_length; / sectors/FAT / __le16 secs_track; / sectors per track / __le16 heads; / number of heads / __le32 hidden; / hidden sectors (unused) / __le32 total_sect; / number of sectors (if sectors == 0) / union { struct { / Extended BPB Fields for FAT16 / __u8 drive_number; / Physical drive number / __u8 state; / undocumented, but used for mount state. / __u8 signature; / extended boot signature / __u8 vol_id[4]; / volume ID / __u8 vol_label[11]; / volume label / __u8 fs_type[8]; / file system type / / other fields are not added here / } fat16; struct { / only used by FAT32 / __le32 length; / sectors/FAT / __le16 flags; / bit 8: fat mirroring, low 4: active fat / __u8 version[2]; / major, minor filesystem version / __le32 root_cluster; / first cluster in root directory / __le16 info_sector; / filesystem info sector / __le16 backup_boot; / backup boot sector / __le16 reserved2[6]; / Unused / / Extended BPB Fields for FAT32 / __u8 drive_number; / Physical drive number / __u8 state; / undocumented, but used for mount state. / __u8 signature; / extended boot signature / __u8 vol_id[4]; / volume ID / __u8 vol_label[11]; / volume label / __u8 fs_type[8]; / file system type / / other fields are not added here / } fat32; }; }; struct fat_boot_fsinfo { __le32 signature1; / 0x41615252L / __le32 reserved1[120]; / Nothing as far as I can tell / __le32 signature2; / 0x61417272L / __le32 free_clusters; / Free cluster count. -1 if unknown / __le32 next_cluster; / Most recently allocated cluster / __le32 reserved2[4]; }; struct msdos_dir_entry { __u8 name[MSDOS_NAME];/ name and extension / __u8 attr; / attribute bits / __u8 lcase; / Case for base and extension / __u8 ctime_cs; / Creation time, centiseconds (0-199) / __le16 ctime; / Creation time / __le16 cdate; / Creation date / __le16 adate; / Last access date / __le16 starthi; / High 16 bits of cluster in FAT32 / __le16 time,date,start;/ time, date and first cluster / __le32 size; / file size (in bytes) / }; / Up to 13 characters of the name / struct msdos_dir_slot { __u8 id; / sequence number for slot / __u8 name0_4[10]; / first 5 characters in name / __u8 attr; / attribute byte / __u8 reserved; / always 0 / __u8 alias_checksum; / checksum for 8.3 alias / __u8 name5_10[12]; / 6 more characters in name / __le16 start; / starting cluster number, 0 in long slots / __u8 name11_12[4]; / last 2 characters in name / }; #endif / _LINUX_MSDOS_FS_H */ Back

Edit File : msdos_fs.h | Size : 6.80 KB

/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef _LINUX_MSDOS_FS_H
#define _LINUX_MSDOS_FS_H

#include <linux/types.h>
#include <linux/magic.h>
#include <asm/byteorder.h>

/*
 * The MS-DOS filesystem constants/structures
 */

#ifndef SECTOR_SIZE
#define SECTOR_SIZE	512		/* sector size (bytes) */
#endif
#define SECTOR_BITS	9		/* log2(SECTOR_SIZE) */
#define MSDOS_DPB	(MSDOS_DPS)	/* dir entries per block */
#define MSDOS_DPB_BITS	4		/* log2(MSDOS_DPB) */
#define MSDOS_DPS	(SECTOR_SIZE / sizeof(struct msdos_dir_entry))
#define MSDOS_DPS_BITS	4		/* log2(MSDOS_DPS) */
#define MSDOS_LONGNAME	256		/* maximum name length */
#define CF_LE_W(v)	le16_to_cpu(v)
#define CF_LE_L(v)	le32_to_cpu(v)
#define CT_LE_W(v)	cpu_to_le16(v)
#define CT_LE_L(v)	cpu_to_le32(v)

#define MSDOS_ROOT_INO	 1	/* The root inode number */
#define MSDOS_FSINFO_INO 2	/* Used for managing the FSINFO block */

#define MSDOS_DIR_BITS	5	/* log2(sizeof(struct msdos_dir_entry)) */

/* directory limit */
#define FAT_MAX_DIR_ENTRIES	(65536)
#define FAT_MAX_DIR_SIZE	(FAT_MAX_DIR_ENTRIES << MSDOS_DIR_BITS)

#define ATTR_NONE	0	/* no attribute bits */
#define ATTR_RO		1	/* read-only */
#define ATTR_HIDDEN	2	/* hidden */
#define ATTR_SYS	4	/* system */
#define ATTR_VOLUME	8	/* volume label */
#define ATTR_DIR	16	/* directory */
#define ATTR_ARCH	32	/* archived */

/* attribute bits that are copied "as is" */
#define ATTR_UNUSED	(ATTR_VOLUME | ATTR_ARCH | ATTR_SYS | ATTR_HIDDEN)
/* bits that are used by the Windows 95/Windows NT extended FAT */
#define ATTR_EXT	(ATTR_RO | ATTR_HIDDEN | ATTR_SYS | ATTR_VOLUME)

#define CASE_LOWER_BASE	8	/* base is lower case */
#define CASE_LOWER_EXT	16	/* extension is lower case */

#define DELETED_FLAG	0xe5	/* marks file as deleted when in name[0] */
#define IS_FREE(n)	(!*(n) || *(n) == DELETED_FLAG)

#define FAT_LFN_LEN	255	/* maximum long name length */
#define MSDOS_NAME	11	/* maximum name length */
#define MSDOS_SLOTS	21	/* max # of slots for short and long names */
#define MSDOS_DOT	".          "	/* ".", padded to MSDOS_NAME chars */
#define MSDOS_DOTDOT	"..         "	/* "..", padded to MSDOS_NAME chars */

#define FAT_FIRST_ENT(s, x)	((MSDOS_SB(s)->fat_bits == 32 ? 0x0FFFFF00 : \
	MSDOS_SB(s)->fat_bits == 16 ? 0xFF00 : 0xF00) | (x))

/* start of data cluster's entry (number of reserved clusters) */
#define FAT_START_ENT	2

/* maximum number of clusters */
#define MAX_FAT12	0xFF4
#define MAX_FAT16	0xFFF4
#define MAX_FAT32	0x0FFFFFF6
#define MAX_FAT(s)	(MSDOS_SB(s)->fat_bits == 32 ? MAX_FAT32 : \
	MSDOS_SB(s)->fat_bits == 16 ? MAX_FAT16 : MAX_FAT12)

/* bad cluster mark */
#define BAD_FAT12	0xFF7
#define BAD_FAT16	0xFFF7
#define BAD_FAT32	0x0FFFFFF7

/* standard EOF */
#define EOF_FAT12	0xFFF
#define EOF_FAT16	0xFFFF
#define EOF_FAT32	0x0FFFFFFF

#define FAT_ENT_FREE	(0)
#define FAT_ENT_BAD	(BAD_FAT32)
#define FAT_ENT_EOF	(EOF_FAT32)

#define FAT_FSINFO_SIG1	0x41615252
#define FAT_FSINFO_SIG2	0x61417272
#define IS_FSINFO(x)	(le32_to_cpu((x)->signature1) == FAT_FSINFO_SIG1 \
			 && le32_to_cpu((x)->signature2) == FAT_FSINFO_SIG2)

#define FAT_STATE_DIRTY 0x01

struct __fat_dirent {
	long		d_ino;
	__kernel_off_t	d_off;
	unsigned short	d_reclen;
	char		d_name[256]; /* We must not include limits.h! */
};

/*
 * ioctl commands
 */
#define VFAT_IOCTL_READDIR_BOTH		_IOR('r', 1, struct __fat_dirent[2])
#define VFAT_IOCTL_READDIR_SHORT	_IOR('r', 2, struct __fat_dirent[2])
/* <linux/videotext.h> has used 0x72 ('r') in collision, so skip a few */
#define FAT_IOCTL_GET_ATTRIBUTES	_IOR('r', 0x10, __u32)
#define FAT_IOCTL_SET_ATTRIBUTES	_IOW('r', 0x11, __u32)
/*Android kernel has used 0x12, so we use 0x13*/
#define FAT_IOCTL_GET_VOLUME_ID		_IOR('r', 0x13, __u32)

struct fat_boot_sector {
	__u8	ignored[3];	/* Boot strap short or near jump */
	__u8	system_id[8];	/* Name - can be used to special case
				   partition manager volumes */
	__u8	sector_size[2];	/* bytes per logical sector */
	__u8	sec_per_clus;	/* sectors/cluster */
	__le16	reserved;	/* reserved sectors */
	__u8	fats;		/* number of FATs */
	__u8	dir_entries[2];	/* root directory entries */
	__u8	sectors[2];	/* number of sectors */
	__u8	media;		/* media code */
	__le16	fat_length;	/* sectors/FAT */
	__le16	secs_track;	/* sectors per track */
	__le16	heads;		/* number of heads */
	__le32	hidden;		/* hidden sectors (unused) */
	__le32	total_sect;	/* number of sectors (if sectors == 0) */

union {
		struct {
			/*  Extended BPB Fields for FAT16 */
			__u8	drive_number;	/* Physical drive number */
			__u8	state;		/* undocumented, but used
						   for mount state. */
			__u8	signature;  /* extended boot signature */
			__u8	vol_id[4];	/* volume ID */
			__u8	vol_label[11];	/* volume label */
			__u8	fs_type[8];		/* file system type */
			/* other fields are not added here */
		} fat16;

struct {
			/* only used by FAT32 */
			__le32	length;		/* sectors/FAT */
			__le16	flags;		/* bit 8: fat mirroring,
						   low 4: active fat */
			__u8	version[2];	/* major, minor filesystem
						   version */
			__le32	root_cluster;	/* first cluster in
						   root directory */
			__le16	info_sector;	/* filesystem info sector */
			__le16	backup_boot;	/* backup boot sector */
			__le16	reserved2[6];	/* Unused */
			/* Extended BPB Fields for FAT32 */
			__u8	drive_number;   /* Physical drive number */
			__u8    state;       	/* undocumented, but used
						   for mount state. */
			__u8	signature;  /* extended boot signature */
			__u8	vol_id[4];	/* volume ID */
			__u8	vol_label[11];	/* volume label */
			__u8	fs_type[8];		/* file system type */
			/* other fields are not added here */
		} fat32;
	};
};

struct fat_boot_fsinfo {
	__le32   signature1;	/* 0x41615252L */
	__le32   reserved1[120];	/* Nothing as far as I can tell */
	__le32   signature2;	/* 0x61417272L */
	__le32   free_clusters;	/* Free cluster count.  -1 if unknown */
	__le32   next_cluster;	/* Most recently allocated cluster */
	__le32   reserved2[4];
};

struct msdos_dir_entry {
	__u8	name[MSDOS_NAME];/* name and extension */
	__u8	attr;		/* attribute bits */
	__u8    lcase;		/* Case for base and extension */
	__u8	ctime_cs;	/* Creation time, centiseconds (0-199) */
	__le16	ctime;		/* Creation time */
	__le16	cdate;		/* Creation date */
	__le16	adate;		/* Last access date */
	__le16	starthi;	/* High 16 bits of cluster in FAT32 */
	__le16	time,date,start;/* time, date and first cluster */
	__le32	size;		/* file size (in bytes) */
};

/* Up to 13 characters of the name */
struct msdos_dir_slot {
	__u8    id;		/* sequence number for slot */
	__u8    name0_4[10];	/* first 5 characters in name */
	__u8    attr;		/* attribute byte */
	__u8    reserved;	/* always 0 */
	__u8    alias_checksum;	/* checksum for 8.3 alias */
	__u8    name5_10[12];	/* 6 more characters in name */
	__le16   start;		/* starting cluster number, 0 in long slots */
	__u8    name11_12[4];	/* last 2 characters in name */
};

#endif /* _LINUX_MSDOS_FS_H */

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