| /* 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 |
| */ |
| |
| #define SECTOR_SIZE 512 /* sector size (bytes) */ |
| #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 */ |