struct lvm1_super_block {
uint8_t id[2];
-} __attribute__((packed));
+} PACKED;
struct lvm2_super_block {
uint8_t id[8];
uint32_t crc_xl;
uint32_t offset_xl;
uint8_t type[8];
-} __attribute__((packed));
+} PACKED;
#define LVM1_SB_OFF 0x400
#define LVM1_MAGIC "HM"