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VHOLD(9) Kernel Developer's Manual VHOLD(9)

vhold, vdropacquire/release a hold on a vnode

#include <sys/param.h>
#include <sys/vnode.h>

void
vhold(struct vnode *vp);

void
vdrop(struct vnode *vp);

The () function increments the v_holdcnt of the given vnode. If the vnode has already been added to the free list and its v_holdcnt and v_usecount are both zero, it will be removed from the free list and added to the vnode hold list.

The () function decrements the v_holdcnt of the given vnode. If the vnode is on the vnode hold list and its v_holdcnt and v_usecount are both zero, it will be removed from the vnode hold list and added to the freed list.

vnode(9)

This man page was originally written by Chad David <davidc@acns.ab.ca> for FreeBSD.

July 17, 2013 OpenBSD-6.0