BIO_ISSUE_SIZE_BITS  103 include/linux/blk_types.h #define BIO_ISSUE_SIZE_SHIFT    (BIO_ISSUE_RES_SHIFT - BIO_ISSUE_SIZE_BITS)
BIO_ISSUE_SIZE_BITS  106 include/linux/blk_types.h 	(((1ULL << BIO_ISSUE_SIZE_BITS) - 1) << BIO_ISSUE_SIZE_SHIFT)
BIO_ISSUE_SIZE_BITS  134 include/linux/blk_types.h 	size &= (1ULL << BIO_ISSUE_SIZE_BITS) - 1;