blkif_x86_64_sring 222 drivers/block/xen-blkback/xenbus.c struct blkif_x86_64_sring *sring_x86_64; blkif_x86_64_sring 223 drivers/block/xen-blkback/xenbus.c sring_x86_64 = (struct blkif_x86_64_sring *)ring->blk_ring;