update outstanding I/O count and do
wakeup on a vnode
function updates the number of outstanding I/O operations on the target
vnode, stored in its v_numoutput field. If the target
vnode has the
VBIOWAIT flag set in its
v_bioflag field and has no outstanding I/O operations
remaining, a wakeup(9) is performed as well.
function must be called at
panic(9), splbio(9), vnode(9), vwaitforio(9), wakeup(9)
This document first appeared in OpenBSD 3.7.
vwakeup() more times than the
number of outstanding I/O operations will cause the system to