fat: add extended fileds to struct fat_boot_sector

Later we will need "state" field to check if volume was cleanly unmounted.

Oleksij Rempel committed 13 years ago

Commit 6b464191 parent 899bed02 files · +32 −12Browse files

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@@ -120,14 +120,34 @@ struct fat_boot_sector { · 119 unmodified lines
120	120	__le32 hidden; /* hidden sectors (unused) */
121	121	__le32 total_sect; /* number of sectors (if sectors == 0) */
122	122
123		− /* The following fields are only used by FAT32 */
124		− __le32 fat32_length; /* sectors/FAT */
125		− __le16 flags; /* bit 8: fat mirroring, low 4: active fat */
126		− __u8 version[2]; /* major, minor filesystem version */
127		− __le32 root_cluster; /* first cluster in root directory */
128		− __le16 info_sector; /* filesystem info sector */
129		− __le16 backup_boot; /* backup boot sector */
130		− __le16 reserved2[6]; /* Unused */
	123	+ union {
	124	+ struct {
	125	+ /* Extended BPB Fields for FAT16 */
	126	+ __u8 drive_number; /* Physical drive number */
	127	+ __u8 state; /* undocumented, but used
	128	+ for mount state. */
	129	+ /* other fiealds are not added here */
	130	+ } fat16;
	131	+
	132	+ struct {
	133	+ /* only used by FAT32 */
	134	+ __le32 length; /* sectors/FAT */
	135	+ __le16 flags; /* bit 8: fat mirroring,
	136	+ low 4: active fat */
	137	+ __u8 version[2]; /* major, minor filesystem
	138	+ version */
	139	+ __le32 root_cluster; /* first cluster in
	140	+ root directory */
	141	+ __le16 info_sector; /* filesystem info sector */
	142	+ __le16 backup_boot; /* backup boot sector */
	143	+ __le16 reserved2[6]; /* Unused */
	144	+ /* Extended BPB Fields for FAT32 */
	145	+ __u8 drive_number; /* Physical drive number */
	146	+ __u8 state; /* undocumented, but used
	147	+ for mount state. */
	148	+ /* other fiealds are not added here */
	149	+ } fat32;
	150	+ };
131	151	};
132	152
133	153	struct fat_boot_fsinfo {