Driver: Change back from using vn_rdwr to VNOP_READ
Driver: Change back from using vn_rdwr to VNOP_READ

tburgin/santa,mcastilho/santa,russellhancox/santa,russellhancox/santa,mcastilho/santa,tburgin/santa,google/santa,tburgin/santa,google/santa,mcastilho/santa,russellhancox/santa,google/santa