vref, vrefl — increment the use count for a vnode

       This manual page was written by Doug Rabson.

Debian                                          January 18, 2016                                         VREF(9)

       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.

       vref, vrefl — increment the use count for a vnode

vget(9), vnode(9), vput(9), vrefcnt(9), vrele(9)

#include<sys/param.h>#include<sys/vnode.h>voidvref(structvnode*vp);

       voidvrefl(structvnode*vp);