--- /dev/null
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+#ifndef _LINUX_MSDOS_FS_H
+#define _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 /* _LINUX_MSDOS_FS_H */
projects / cross.git / blobdiff