vref,
vrefl —
increment the use count for a vnode
#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. 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.
vget(9),
vnode(9),
vput(9),
vrefcnt(9),
vrele(9)
This manual page was written by
Doug
Rabson.