Manual Pages  — VREF

vref – increment the use count for a vnode

SYNOPSIS DESCRIPTION SEE ALSO AUTHORS

#include <sys/param.h>

#include <sys/vnode.h>

void
vref(struct vnode *vp);

void
vrefl(struct vnode *vp);

Increment the v_usecount field of a vnode.

vp
	the vnode to increment

Each vnode maintains a reference count of how many parts of the system are using the vnode. This allows the system to detect when a vnode is no longer being used and can be safely recycled for a different file.

Any code in the system which is using a vnode (e.g.amp; during the operation of some algorithm or to store in a data structure) should call vref() or vrefl().

vref() locks the vnode interlock while vrefl() expects the interlock to already be held.

This manual page was written by Doug Rabson.