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198 lines
6.6 KiB
C
198 lines
6.6 KiB
C
4 years ago
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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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#ifndef _LINUX_MSDOS_FS_H
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#define _LINUX_MSDOS_FS_H
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#include <linux/types.h>
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#include <linux/magic.h>
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#include <asm/byteorder.h>
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/*
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* The MS-DOS filesystem constants/structures
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*/
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#ifndef SECTOR_SIZE
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#define SECTOR_SIZE 512 /* sector size (bytes) */
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#endif
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#define SECTOR_BITS 9 /* log2(SECTOR_SIZE) */
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#define MSDOS_DPB (MSDOS_DPS) /* dir entries per block */
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#define MSDOS_DPB_BITS 4 /* log2(MSDOS_DPB) */
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#define MSDOS_DPS (SECTOR_SIZE / sizeof(struct msdos_dir_entry))
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#define MSDOS_DPS_BITS 4 /* log2(MSDOS_DPS) */
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#define MSDOS_LONGNAME 256 /* maximum name length */
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#define CF_LE_W(v) le16_to_cpu(v)
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#define CF_LE_L(v) le32_to_cpu(v)
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#define CT_LE_W(v) cpu_to_le16(v)
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#define CT_LE_L(v) cpu_to_le32(v)
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#define MSDOS_ROOT_INO 1 /* The root inode number */
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#define MSDOS_FSINFO_INO 2 /* Used for managing the FSINFO block */
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#define MSDOS_DIR_BITS 5 /* log2(sizeof(struct msdos_dir_entry)) */
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/* directory limit */
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#define FAT_MAX_DIR_ENTRIES (65536)
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#define FAT_MAX_DIR_SIZE (FAT_MAX_DIR_ENTRIES << MSDOS_DIR_BITS)
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#define ATTR_NONE 0 /* no attribute bits */
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#define ATTR_RO 1 /* read-only */
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#define ATTR_HIDDEN 2 /* hidden */
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#define ATTR_SYS 4 /* system */
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#define ATTR_VOLUME 8 /* volume label */
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#define ATTR_DIR 16 /* directory */
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#define ATTR_ARCH 32 /* archived */
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/* attribute bits that are copied "as is" */
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#define ATTR_UNUSED (ATTR_VOLUME | ATTR_ARCH | ATTR_SYS | ATTR_HIDDEN)
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/* bits that are used by the Windows 95/Windows NT extended FAT */
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#define ATTR_EXT (ATTR_RO | ATTR_HIDDEN | ATTR_SYS | ATTR_VOLUME)
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#define CASE_LOWER_BASE 8 /* base is lower case */
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#define CASE_LOWER_EXT 16 /* extension is lower case */
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#define DELETED_FLAG 0xe5 /* marks file as deleted when in name[0] */
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#define IS_FREE(n) (!*(n) || *(n) == DELETED_FLAG)
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#define FAT_LFN_LEN 255 /* maximum long name length */
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#define MSDOS_NAME 11 /* maximum name length */
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#define MSDOS_SLOTS 21 /* max # of slots for short and long names */
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#define MSDOS_DOT ". " /* ".", padded to MSDOS_NAME chars */
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#define MSDOS_DOTDOT ".. " /* "..", padded to MSDOS_NAME chars */
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/* start of data cluster's entry (number of reserved clusters) */
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#define FAT_START_ENT 2
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/* maximum number of clusters */
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#define MAX_FAT12 0xFF4
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#define MAX_FAT16 0xFFF4
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#define MAX_FAT32 0x0FFFFFF6
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/* bad cluster mark */
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#define BAD_FAT12 0xFF7
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#define BAD_FAT16 0xFFF7
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#define BAD_FAT32 0x0FFFFFF7
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/* standard EOF */
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#define EOF_FAT12 0xFFF
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#define EOF_FAT16 0xFFFF
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#define EOF_FAT32 0x0FFFFFFF
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#define FAT_ENT_FREE (0)
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#define FAT_ENT_BAD (BAD_FAT32)
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#define FAT_ENT_EOF (EOF_FAT32)
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#define FAT_FSINFO_SIG1 0x41615252
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#define FAT_FSINFO_SIG2 0x61417272
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#define IS_FSINFO(x) (le32_to_cpu((x)->signature1) == FAT_FSINFO_SIG1 \
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&& le32_to_cpu((x)->signature2) == FAT_FSINFO_SIG2)
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#define FAT_STATE_DIRTY 0x01
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struct __fat_dirent {
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long d_ino;
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__kernel_off_t d_off;
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unsigned short d_reclen;
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char d_name[256]; /* We must not include limits.h! */
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};
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/*
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* ioctl commands
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*/
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#define VFAT_IOCTL_READDIR_BOTH _IOR('r', 1, struct __fat_dirent[2])
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#define VFAT_IOCTL_READDIR_SHORT _IOR('r', 2, struct __fat_dirent[2])
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/* <linux/videotext.h> has used 0x72 ('r') in collision, so skip a few */
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#define FAT_IOCTL_GET_ATTRIBUTES _IOR('r', 0x10, __u32)
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#define FAT_IOCTL_SET_ATTRIBUTES _IOW('r', 0x11, __u32)
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/*Android kernel has used 0x12, so we use 0x13*/
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#define FAT_IOCTL_GET_VOLUME_ID _IOR('r', 0x13, __u32)
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struct fat_boot_sector {
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__u8 ignored[3]; /* Boot strap short or near jump */
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__u8 system_id[8]; /* Name - can be used to special case
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partition manager volumes */
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__u8 sector_size[2]; /* bytes per logical sector */
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__u8 sec_per_clus; /* sectors/cluster */
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__le16 reserved; /* reserved sectors */
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__u8 fats; /* number of FATs */
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__u8 dir_entries[2]; /* root directory entries */
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__u8 sectors[2]; /* number of sectors */
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__u8 media; /* media code */
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__le16 fat_length; /* sectors/FAT */
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__le16 secs_track; /* sectors per track */
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__le16 heads; /* number of heads */
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__le32 hidden; /* hidden sectors (unused) */
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__le32 total_sect; /* number of sectors (if sectors == 0) */
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union {
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struct {
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/* Extended BPB Fields for FAT16 */
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__u8 drive_number; /* Physical drive number */
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__u8 state; /* undocumented, but used
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for mount state. */
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__u8 signature; /* extended boot signature */
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__u8 vol_id[4]; /* volume ID */
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__u8 vol_label[MSDOS_NAME]; /* volume label */
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__u8 fs_type[8]; /* file system type */
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/* other fields are not added here */
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} fat16;
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struct {
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/* only used by FAT32 */
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__le32 length; /* sectors/FAT */
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__le16 flags; /* bit 8: fat mirroring,
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low 4: active fat */
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__u8 version[2]; /* major, minor filesystem
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version */
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__le32 root_cluster; /* first cluster in
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root directory */
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__le16 info_sector; /* filesystem info sector */
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__le16 backup_boot; /* backup boot sector */
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__le16 reserved2[6]; /* Unused */
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/* Extended BPB Fields for FAT32 */
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__u8 drive_number; /* Physical drive number */
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__u8 state; /* undocumented, but used
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for mount state. */
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__u8 signature; /* extended boot signature */
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__u8 vol_id[4]; /* volume ID */
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__u8 vol_label[MSDOS_NAME]; /* volume label */
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__u8 fs_type[8]; /* file system type */
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/* other fields are not added here */
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} fat32;
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};
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};
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struct fat_boot_fsinfo {
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__le32 signature1; /* 0x41615252L */
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__le32 reserved1[120]; /* Nothing as far as I can tell */
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__le32 signature2; /* 0x61417272L */
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__le32 free_clusters; /* Free cluster count. -1 if unknown */
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__le32 next_cluster; /* Most recently allocated cluster */
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__le32 reserved2[4];
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};
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struct msdos_dir_entry {
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__u8 name[MSDOS_NAME];/* name and extension */
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__u8 attr; /* attribute bits */
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__u8 lcase; /* Case for base and extension */
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__u8 ctime_cs; /* Creation time, centiseconds (0-199) */
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__le16 ctime; /* Creation time */
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__le16 cdate; /* Creation date */
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__le16 adate; /* Last access date */
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__le16 starthi; /* High 16 bits of cluster in FAT32 */
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__le16 time,date,start;/* time, date and first cluster */
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__le32 size; /* file size (in bytes) */
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};
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/* Up to 13 characters of the name */
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struct msdos_dir_slot {
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__u8 id; /* sequence number for slot */
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__u8 name0_4[10]; /* first 5 characters in name */
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__u8 attr; /* attribute byte */
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__u8 reserved; /* always 0 */
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__u8 alias_checksum; /* checksum for 8.3 alias */
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__u8 name5_10[12]; /* 6 more characters in name */
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__le16 start; /* starting cluster number, 0 in long slots */
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__u8 name11_12[4]; /* last 2 characters in name */
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};
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#endif /* _LINUX_MSDOS_FS_H */
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