NAME
vref, vrefl
— increment the use count for a
vnode
SYNOPSIS
#include
<sys/param.h>
#include <sys/vnode.h>
void
vref(struct
vnode *vp);
void
vrefl(struct
vnode *vp);
DESCRIPTION
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.
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.
SEE ALSO
AUTHORS
This manual page was written by Doug Rabson.