blk_flags_t
#define BLK_FLAG_WRITE_CACHE_DISABLED ((__force blk_flags_t)(1u << 0))
#define BLK_FLAG_MISALIGNED ((__force blk_flags_t)(1u << 1))
#define BLK_FLAG_IOSTATS_PASSTHROUGH ((__force blk_flags_t)(1u << 2))
blk_flags_t flags;