BIO_ISSUE_RES_SHIFT 103 include/linux/blk_types.h #define BIO_ISSUE_SIZE_SHIFT (BIO_ISSUE_RES_SHIFT - BIO_ISSUE_SIZE_BITS) BIO_ISSUE_RES_SHIFT 107 include/linux/blk_types.h #define BIO_ISSUE_RES_MASK (~((1ULL << BIO_ISSUE_RES_SHIFT) - 1))