Refactor vnd(4) to use vn_rdwr() instead of setting up the uio/iovec structs and calling vn_lock+VOP_READ/WRITE+VOP_UNLOCK.
Refactor vnd(4) to use vn_rdwr() instead of setting up the uio/iovec
structs and calling vn_lock+VOP_READ/WRITE+VOP_UNLOCK.

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars