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January 18, 2016


Manual pages for a GNU/kFreeBSD system


vref, vrefl - increment the use count for a vnode


.In sys/param.h
.In 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.


This manual page was written by
.An Doug Rabson .
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