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1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */2#ifndef _UAPI_LINUX_MSDOS_FS_H3#define _UAPI_LINUX_MSDOS_FS_H4 5#include <linux/types.h>6#include <linux/magic.h>7#include <asm/byteorder.h>8 9/*10 * The MS-DOS filesystem constants/structures11 */12 13#ifndef SECTOR_SIZE14#define SECTOR_SIZE 512 /* sector size (bytes) */15#endif16#define SECTOR_BITS 9 /* log2(SECTOR_SIZE) */17#define MSDOS_DPB (MSDOS_DPS) /* dir entries per block */18#define MSDOS_DPB_BITS 4 /* log2(MSDOS_DPB) */19#define MSDOS_DPS (SECTOR_SIZE / sizeof(struct msdos_dir_entry))20#define MSDOS_DPS_BITS 4 /* log2(MSDOS_DPS) */21#define MSDOS_LONGNAME 256 /* maximum name length */22#define CF_LE_W(v) le16_to_cpu(v)23#define CF_LE_L(v) le32_to_cpu(v)24#define CT_LE_W(v) cpu_to_le16(v)25#define CT_LE_L(v) cpu_to_le32(v)26 27#define MSDOS_ROOT_INO 1 /* The root inode number */28#define MSDOS_FSINFO_INO 2 /* Used for managing the FSINFO block */29 30#define MSDOS_DIR_BITS 5 /* log2(sizeof(struct msdos_dir_entry)) */31 32/* directory limit */33#define FAT_MAX_DIR_ENTRIES (65536)34#define FAT_MAX_DIR_SIZE (FAT_MAX_DIR_ENTRIES << MSDOS_DIR_BITS)35 36#define ATTR_NONE 0 /* no attribute bits */37#define ATTR_RO 1 /* read-only */38#define ATTR_HIDDEN 2 /* hidden */39#define ATTR_SYS 4 /* system */40#define ATTR_VOLUME 8 /* volume label */41#define ATTR_DIR 16 /* directory */42#define ATTR_ARCH 32 /* archived */43 44/* attribute bits that are copied "as is" */45#define ATTR_UNUSED (ATTR_VOLUME | ATTR_ARCH | ATTR_SYS | ATTR_HIDDEN)46/* bits that are used by the Windows 95/Windows NT extended FAT */47#define ATTR_EXT (ATTR_RO | ATTR_HIDDEN | ATTR_SYS | ATTR_VOLUME)48 49#define CASE_LOWER_BASE 8 /* base is lower case */50#define CASE_LOWER_EXT 16 /* extension is lower case */51 52#define DELETED_FLAG 0xe5 /* marks file as deleted when in name[0] */53#define IS_FREE(n) (!*(n) || *(n) == DELETED_FLAG)54 55#define FAT_LFN_LEN 255 /* maximum long name length */56#define MSDOS_NAME 11 /* maximum name length */57#define MSDOS_SLOTS 21 /* max # of slots for short and long names */58#define MSDOS_DOT ". " /* ".", padded to MSDOS_NAME chars */59#define MSDOS_DOTDOT ".. " /* "..", padded to MSDOS_NAME chars */60 61/* start of data cluster's entry (number of reserved clusters) */62#define FAT_START_ENT 263 64/* maximum number of clusters */65#define MAX_FAT12 0xFF466#define MAX_FAT16 0xFFF467#define MAX_FAT32 0x0FFFFFF668 69/* bad cluster mark */70#define BAD_FAT12 0xFF771#define BAD_FAT16 0xFFF772#define BAD_FAT32 0x0FFFFFF773 74/* standard EOF */75#define EOF_FAT12 0xFFF76#define EOF_FAT16 0xFFFF77#define EOF_FAT32 0x0FFFFFFF78 79#define FAT_ENT_FREE (0)80#define FAT_ENT_BAD (BAD_FAT32)81#define FAT_ENT_EOF (EOF_FAT32)82 83#define FAT_FSINFO_SIG1 0x4161525284#define FAT_FSINFO_SIG2 0x6141727285#define IS_FSINFO(x) (le32_to_cpu((x)->signature1) == FAT_FSINFO_SIG1 \86 && le32_to_cpu((x)->signature2) == FAT_FSINFO_SIG2)87 88#define FAT_STATE_DIRTY 0x0189 90struct __fat_dirent {91 long d_ino;92 __kernel_off_t d_off;93 unsigned short d_reclen;94 char d_name[256]; /* We must not include limits.h! */95};96 97/*98 * ioctl commands99 */100#define VFAT_IOCTL_READDIR_BOTH _IOR('r', 1, struct __fat_dirent[2])101#define VFAT_IOCTL_READDIR_SHORT _IOR('r', 2, struct __fat_dirent[2])102/* <linux/videotext.h> has used 0x72 ('r') in collision, so skip a few */103#define FAT_IOCTL_GET_ATTRIBUTES _IOR('r', 0x10, __u32)104#define FAT_IOCTL_SET_ATTRIBUTES _IOW('r', 0x11, __u32)105/*Android kernel has used 0x12, so we use 0x13*/106#define FAT_IOCTL_GET_VOLUME_ID _IOR('r', 0x13, __u32)107 108struct fat_boot_sector {109 __u8 ignored[3]; /* Boot strap short or near jump */110 __u8 system_id[8]; /* Name - can be used to special case111 partition manager volumes */112 __u8 sector_size[2]; /* bytes per logical sector */113 __u8 sec_per_clus; /* sectors/cluster */114 __le16 reserved; /* reserved sectors */115 __u8 fats; /* number of FATs */116 __u8 dir_entries[2]; /* root directory entries */117 __u8 sectors[2]; /* number of sectors */118 __u8 media; /* media code */119 __le16 fat_length; /* sectors/FAT */120 __le16 secs_track; /* sectors per track */121 __le16 heads; /* number of heads */122 __le32 hidden; /* hidden sectors (unused) */123 __le32 total_sect; /* number of sectors (if sectors == 0) */124 125 union {126 struct {127 /* Extended BPB Fields for FAT16 */128 __u8 drive_number; /* Physical drive number */129 __u8 state; /* undocumented, but used130 for mount state. */131 __u8 signature; /* extended boot signature */132 __u8 vol_id[4]; /* volume ID */133 __u8 vol_label[MSDOS_NAME]; /* volume label */134 __u8 fs_type[8]; /* file system type */135 /* other fields are not added here */136 } fat16;137 138 struct {139 /* only used by FAT32 */140 __le32 length; /* sectors/FAT */141 __le16 flags; /* bit 8: fat mirroring,142 low 4: active fat */143 __u8 version[2]; /* major, minor filesystem144 version */145 __le32 root_cluster; /* first cluster in146 root directory */147 __le16 info_sector; /* filesystem info sector */148 __le16 backup_boot; /* backup boot sector */149 __le16 reserved2[6]; /* Unused */150 /* Extended BPB Fields for FAT32 */151 __u8 drive_number; /* Physical drive number */152 __u8 state; /* undocumented, but used153 for mount state. */154 __u8 signature; /* extended boot signature */155 __u8 vol_id[4]; /* volume ID */156 __u8 vol_label[MSDOS_NAME]; /* volume label */157 __u8 fs_type[8]; /* file system type */158 /* other fields are not added here */159 } fat32;160 };161};162 163struct fat_boot_fsinfo {164 __le32 signature1; /* 0x41615252L */165 __le32 reserved1[120]; /* Nothing as far as I can tell */166 __le32 signature2; /* 0x61417272L */167 __le32 free_clusters; /* Free cluster count. -1 if unknown */168 __le32 next_cluster; /* Most recently allocated cluster */169 __le32 reserved2[4];170};171 172struct msdos_dir_entry {173 __u8 name[MSDOS_NAME];/* name and extension */174 __u8 attr; /* attribute bits */175 __u8 lcase; /* Case for base and extension */176 __u8 ctime_cs; /* Creation time, centiseconds (0-199) */177 __le16 ctime; /* Creation time */178 __le16 cdate; /* Creation date */179 __le16 adate; /* Last access date */180 __le16 starthi; /* High 16 bits of cluster in FAT32 */181 __le16 time,date,start;/* time, date and first cluster */182 __le32 size; /* file size (in bytes) */183};184 185/* Up to 13 characters of the name */186struct msdos_dir_slot {187 __u8 id; /* sequence number for slot */188 __u8 name0_4[10]; /* first 5 characters in name */189 __u8 attr; /* attribute byte */190 __u8 reserved; /* always 0 */191 __u8 alias_checksum; /* checksum for 8.3 alias */192 __u8 name5_10[12]; /* 6 more characters in name */193 __le16 start; /* starting cluster number, 0 in long slots */194 __u8 name11_12[4]; /* last 2 characters in name */195};196 197#endif /* _UAPI_LINUX_MSDOS_FS_H */198