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))