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Man Pages
VREF(9) FreeBSD Kernel Developer's Manual VREF(9)

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.
January 18, 2016 FreeBSD 12.0-RELEASE

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