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197 lines
6.6 KiB
197 lines
6.6 KiB
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ |
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#ifndef _UAPI_LINUX_MSDOS_FS_H |
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#define _UAPI_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 /* _UAPI_LINUX_MSDOS_FS_H */
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