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Diffstat (limited to 'include/uapi/linux/msdos_fs.h')
| -rw-r--r-- | include/uapi/linux/msdos_fs.h | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/include/uapi/linux/msdos_fs.h b/include/uapi/linux/msdos_fs.h new file mode 100644 index 000000000..fde753735 --- /dev/null +++ b/include/uapi/linux/msdos_fs.h @@ -0,0 +1,202 @@ +/* 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 */ + +#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 /* _UAPI_LINUX_MSDOS_FS_H */ |