16f52b16cSGreg Kroah-Hartman /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 2607ca46eSDavid Howells #ifndef _UAPI_LINUX_MSDOS_FS_H 3607ca46eSDavid Howells #define _UAPI_LINUX_MSDOS_FS_H 4607ca46eSDavid Howells 5607ca46eSDavid Howells #include <linux/types.h> 6607ca46eSDavid Howells #include <linux/magic.h> 7607ca46eSDavid Howells #include <asm/byteorder.h> 8607ca46eSDavid Howells 9607ca46eSDavid Howells /* 10607ca46eSDavid Howells * The MS-DOS filesystem constants/structures 11607ca46eSDavid Howells */ 12607ca46eSDavid Howells 13233bde21SBart Van Assche #ifndef SECTOR_SIZE 14607ca46eSDavid Howells #define SECTOR_SIZE 512 /* sector size (bytes) */ 15233bde21SBart Van Assche #endif 16607ca46eSDavid Howells #define SECTOR_BITS 9 /* log2(SECTOR_SIZE) */ 17607ca46eSDavid Howells #define MSDOS_DPB (MSDOS_DPS) /* dir entries per block */ 18607ca46eSDavid Howells #define MSDOS_DPB_BITS 4 /* log2(MSDOS_DPB) */ 19607ca46eSDavid Howells #define MSDOS_DPS (SECTOR_SIZE / sizeof(struct msdos_dir_entry)) 20607ca46eSDavid Howells #define MSDOS_DPS_BITS 4 /* log2(MSDOS_DPS) */ 21607ca46eSDavid Howells #define MSDOS_LONGNAME 256 /* maximum name length */ 22607ca46eSDavid Howells #define CF_LE_W(v) le16_to_cpu(v) 23607ca46eSDavid Howells #define CF_LE_L(v) le32_to_cpu(v) 24607ca46eSDavid Howells #define CT_LE_W(v) cpu_to_le16(v) 25607ca46eSDavid Howells #define CT_LE_L(v) cpu_to_le32(v) 26607ca46eSDavid Howells 27607ca46eSDavid Howells #define MSDOS_ROOT_INO 1 /* The root inode number */ 28607ca46eSDavid Howells #define MSDOS_FSINFO_INO 2 /* Used for managing the FSINFO block */ 29607ca46eSDavid Howells 30607ca46eSDavid Howells #define MSDOS_DIR_BITS 5 /* log2(sizeof(struct msdos_dir_entry)) */ 31607ca46eSDavid Howells 32607ca46eSDavid Howells /* directory limit */ 33607ca46eSDavid Howells #define FAT_MAX_DIR_ENTRIES (65536) 34607ca46eSDavid Howells #define FAT_MAX_DIR_SIZE (FAT_MAX_DIR_ENTRIES << MSDOS_DIR_BITS) 35607ca46eSDavid Howells 36607ca46eSDavid Howells #define ATTR_NONE 0 /* no attribute bits */ 37607ca46eSDavid Howells #define ATTR_RO 1 /* read-only */ 38607ca46eSDavid Howells #define ATTR_HIDDEN 2 /* hidden */ 39607ca46eSDavid Howells #define ATTR_SYS 4 /* system */ 40607ca46eSDavid Howells #define ATTR_VOLUME 8 /* volume label */ 41607ca46eSDavid Howells #define ATTR_DIR 16 /* directory */ 42607ca46eSDavid Howells #define ATTR_ARCH 32 /* archived */ 43607ca46eSDavid Howells 44607ca46eSDavid Howells /* attribute bits that are copied "as is" */ 45607ca46eSDavid Howells #define ATTR_UNUSED (ATTR_VOLUME | ATTR_ARCH | ATTR_SYS | ATTR_HIDDEN) 46607ca46eSDavid Howells /* bits that are used by the Windows 95/Windows NT extended FAT */ 47607ca46eSDavid Howells #define ATTR_EXT (ATTR_RO | ATTR_HIDDEN | ATTR_SYS | ATTR_VOLUME) 48607ca46eSDavid Howells 49607ca46eSDavid Howells #define CASE_LOWER_BASE 8 /* base is lower case */ 50607ca46eSDavid Howells #define CASE_LOWER_EXT 16 /* extension is lower case */ 51607ca46eSDavid Howells 52607ca46eSDavid Howells #define DELETED_FLAG 0xe5 /* marks file as deleted when in name[0] */ 53607ca46eSDavid Howells #define IS_FREE(n) (!*(n) || *(n) == DELETED_FLAG) 54607ca46eSDavid Howells 55607ca46eSDavid Howells #define FAT_LFN_LEN 255 /* maximum long name length */ 56607ca46eSDavid Howells #define MSDOS_NAME 11 /* maximum name length */ 57607ca46eSDavid Howells #define MSDOS_SLOTS 21 /* max # of slots for short and long names */ 58607ca46eSDavid Howells #define MSDOS_DOT ". " /* ".", padded to MSDOS_NAME chars */ 59607ca46eSDavid Howells #define MSDOS_DOTDOT ".. " /* "..", padded to MSDOS_NAME chars */ 60607ca46eSDavid Howells 61607ca46eSDavid Howells /* start of data cluster's entry (number of reserved clusters) */ 62607ca46eSDavid Howells #define FAT_START_ENT 2 63607ca46eSDavid Howells 64607ca46eSDavid Howells /* maximum number of clusters */ 65607ca46eSDavid Howells #define MAX_FAT12 0xFF4 66607ca46eSDavid Howells #define MAX_FAT16 0xFFF4 67607ca46eSDavid Howells #define MAX_FAT32 0x0FFFFFF6 68607ca46eSDavid Howells 69607ca46eSDavid Howells /* bad cluster mark */ 70607ca46eSDavid Howells #define BAD_FAT12 0xFF7 71607ca46eSDavid Howells #define BAD_FAT16 0xFFF7 72607ca46eSDavid Howells #define BAD_FAT32 0x0FFFFFF7 73607ca46eSDavid Howells 74607ca46eSDavid Howells /* standard EOF */ 75607ca46eSDavid Howells #define EOF_FAT12 0xFFF 76607ca46eSDavid Howells #define EOF_FAT16 0xFFFF 77607ca46eSDavid Howells #define EOF_FAT32 0x0FFFFFFF 78607ca46eSDavid Howells 79607ca46eSDavid Howells #define FAT_ENT_FREE (0) 80607ca46eSDavid Howells #define FAT_ENT_BAD (BAD_FAT32) 81607ca46eSDavid Howells #define FAT_ENT_EOF (EOF_FAT32) 82607ca46eSDavid Howells 83607ca46eSDavid Howells #define FAT_FSINFO_SIG1 0x41615252 84607ca46eSDavid Howells #define FAT_FSINFO_SIG2 0x61417272 85607ca46eSDavid Howells #define IS_FSINFO(x) (le32_to_cpu((x)->signature1) == FAT_FSINFO_SIG1 \ 86607ca46eSDavid Howells && le32_to_cpu((x)->signature2) == FAT_FSINFO_SIG2) 87607ca46eSDavid Howells 88b88a1058SOleksij Rempel #define FAT_STATE_DIRTY 0x01 89b88a1058SOleksij Rempel 90607ca46eSDavid Howells struct __fat_dirent { 91607ca46eSDavid Howells long d_ino; 92607ca46eSDavid Howells __kernel_off_t d_off; 93607ca46eSDavid Howells unsigned short d_reclen; 94607ca46eSDavid Howells char d_name[256]; /* We must not include limits.h! */ 95607ca46eSDavid Howells }; 96607ca46eSDavid Howells 97607ca46eSDavid Howells /* 98607ca46eSDavid Howells * ioctl commands 99607ca46eSDavid Howells */ 100607ca46eSDavid Howells #define VFAT_IOCTL_READDIR_BOTH _IOR('r', 1, struct __fat_dirent[2]) 101607ca46eSDavid Howells #define VFAT_IOCTL_READDIR_SHORT _IOR('r', 2, struct __fat_dirent[2]) 102607ca46eSDavid Howells /* <linux/videotext.h> has used 0x72 ('r') in collision, so skip a few */ 103607ca46eSDavid Howells #define FAT_IOCTL_GET_ATTRIBUTES _IOR('r', 0x10, __u32) 104607ca46eSDavid Howells #define FAT_IOCTL_SET_ATTRIBUTES _IOW('r', 0x11, __u32) 1056e5b93eeSMike Lockwood /*Android kernel has used 0x12, so we use 0x13*/ 1066e5b93eeSMike Lockwood #define FAT_IOCTL_GET_VOLUME_ID _IOR('r', 0x13, __u32) 107607ca46eSDavid Howells 108607ca46eSDavid Howells struct fat_boot_sector { 109607ca46eSDavid Howells __u8 ignored[3]; /* Boot strap short or near jump */ 110607ca46eSDavid Howells __u8 system_id[8]; /* Name - can be used to special case 111607ca46eSDavid Howells partition manager volumes */ 112607ca46eSDavid Howells __u8 sector_size[2]; /* bytes per logical sector */ 113607ca46eSDavid Howells __u8 sec_per_clus; /* sectors/cluster */ 114607ca46eSDavid Howells __le16 reserved; /* reserved sectors */ 115607ca46eSDavid Howells __u8 fats; /* number of FATs */ 116607ca46eSDavid Howells __u8 dir_entries[2]; /* root directory entries */ 117607ca46eSDavid Howells __u8 sectors[2]; /* number of sectors */ 118607ca46eSDavid Howells __u8 media; /* media code */ 119607ca46eSDavid Howells __le16 fat_length; /* sectors/FAT */ 120607ca46eSDavid Howells __le16 secs_track; /* sectors per track */ 121607ca46eSDavid Howells __le16 heads; /* number of heads */ 122607ca46eSDavid Howells __le32 hidden; /* hidden sectors (unused) */ 123607ca46eSDavid Howells __le32 total_sect; /* number of sectors (if sectors == 0) */ 124607ca46eSDavid Howells 1256b46419bSOleksij Rempel union { 1266b46419bSOleksij Rempel struct { 1276b46419bSOleksij Rempel /* Extended BPB Fields for FAT16 */ 1286b46419bSOleksij Rempel __u8 drive_number; /* Physical drive number */ 1296b46419bSOleksij Rempel __u8 state; /* undocumented, but used 1306b46419bSOleksij Rempel for mount state. */ 1316e5b93eeSMike Lockwood __u8 signature; /* extended boot signature */ 1326e5b93eeSMike Lockwood __u8 vol_id[4]; /* volume ID */ 1339da22854SCarmeli Tamir __u8 vol_label[MSDOS_NAME]; /* volume label */ 1346e5b93eeSMike Lockwood __u8 fs_type[8]; /* file system type */ 1357d7d731dSJeremiah Mahler /* other fields are not added here */ 1366b46419bSOleksij Rempel } fat16; 1376b46419bSOleksij Rempel 1386b46419bSOleksij Rempel struct { 1396b46419bSOleksij Rempel /* only used by FAT32 */ 1406b46419bSOleksij Rempel __le32 length; /* sectors/FAT */ 1416b46419bSOleksij Rempel __le16 flags; /* bit 8: fat mirroring, 1426b46419bSOleksij Rempel low 4: active fat */ 1436b46419bSOleksij Rempel __u8 version[2]; /* major, minor filesystem 1446b46419bSOleksij Rempel version */ 1456b46419bSOleksij Rempel __le32 root_cluster; /* first cluster in 1466b46419bSOleksij Rempel root directory */ 147607ca46eSDavid Howells __le16 info_sector; /* filesystem info sector */ 148607ca46eSDavid Howells __le16 backup_boot; /* backup boot sector */ 149607ca46eSDavid Howells __le16 reserved2[6]; /* Unused */ 1506b46419bSOleksij Rempel /* Extended BPB Fields for FAT32 */ 1516b46419bSOleksij Rempel __u8 drive_number; /* Physical drive number */ 1526b46419bSOleksij Rempel __u8 state; /* undocumented, but used 1536b46419bSOleksij Rempel for mount state. */ 1546e5b93eeSMike Lockwood __u8 signature; /* extended boot signature */ 1556e5b93eeSMike Lockwood __u8 vol_id[4]; /* volume ID */ 1569da22854SCarmeli Tamir __u8 vol_label[MSDOS_NAME]; /* volume label */ 1576e5b93eeSMike Lockwood __u8 fs_type[8]; /* file system type */ 1587d7d731dSJeremiah Mahler /* other fields are not added here */ 1596b46419bSOleksij Rempel } fat32; 1606b46419bSOleksij Rempel }; 161607ca46eSDavid Howells }; 162607ca46eSDavid Howells 163607ca46eSDavid Howells struct fat_boot_fsinfo { 164607ca46eSDavid Howells __le32 signature1; /* 0x41615252L */ 165607ca46eSDavid Howells __le32 reserved1[120]; /* Nothing as far as I can tell */ 166607ca46eSDavid Howells __le32 signature2; /* 0x61417272L */ 167607ca46eSDavid Howells __le32 free_clusters; /* Free cluster count. -1 if unknown */ 168607ca46eSDavid Howells __le32 next_cluster; /* Most recently allocated cluster */ 169607ca46eSDavid Howells __le32 reserved2[4]; 170607ca46eSDavid Howells }; 171607ca46eSDavid Howells 172607ca46eSDavid Howells struct msdos_dir_entry { 173607ca46eSDavid Howells __u8 name[MSDOS_NAME];/* name and extension */ 174607ca46eSDavid Howells __u8 attr; /* attribute bits */ 175607ca46eSDavid Howells __u8 lcase; /* Case for base and extension */ 176607ca46eSDavid Howells __u8 ctime_cs; /* Creation time, centiseconds (0-199) */ 177607ca46eSDavid Howells __le16 ctime; /* Creation time */ 178607ca46eSDavid Howells __le16 cdate; /* Creation date */ 179607ca46eSDavid Howells __le16 adate; /* Last access date */ 180607ca46eSDavid Howells __le16 starthi; /* High 16 bits of cluster in FAT32 */ 181607ca46eSDavid Howells __le16 time,date,start;/* time, date and first cluster */ 182607ca46eSDavid Howells __le32 size; /* file size (in bytes) */ 183607ca46eSDavid Howells }; 184607ca46eSDavid Howells 185607ca46eSDavid Howells /* Up to 13 characters of the name */ 186607ca46eSDavid Howells struct msdos_dir_slot { 187607ca46eSDavid Howells __u8 id; /* sequence number for slot */ 188607ca46eSDavid Howells __u8 name0_4[10]; /* first 5 characters in name */ 189607ca46eSDavid Howells __u8 attr; /* attribute byte */ 190607ca46eSDavid Howells __u8 reserved; /* always 0 */ 191607ca46eSDavid Howells __u8 alias_checksum; /* checksum for 8.3 alias */ 192607ca46eSDavid Howells __u8 name5_10[12]; /* 6 more characters in name */ 193607ca46eSDavid Howells __le16 start; /* starting cluster number, 0 in long slots */ 194607ca46eSDavid Howells __u8 name11_12[4]; /* last 2 characters in name */ 195607ca46eSDavid Howells }; 196607ca46eSDavid Howells 197607ca46eSDavid Howells #endif /* _UAPI_LINUX_MSDOS_FS_H */ 198