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

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

AUTHORS

       This manual page was written by Doug Rabson.

Debian                                          January 18, 2016                                         VREF(9)