198 lines
6.6 KiB
C
198 lines
6.6 KiB
C
|
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
|
||
|
|
#ifndef _UAPI_LINUX_MSDOS_FS_H
|
||
|
|
#define _UAPI_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 */
|
||
|
|
|
||
|
|
/* 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
|
||
|
|
|
||
|
|
/* 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[MSDOS_NAME]; /* 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[MSDOS_NAME]; /* 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 /* _UAPI_LINUX_MSDOS_FS_H */
|