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NAME

     vhold, vdrop, vdropl - acquire/release a hold on a vnode

SYNOPSIS

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

     void
     vhold(struct vnode *vp);

     void
     vdrop(struct vnode *vp);

     void
     vdropl(struct vnode *vp);

DESCRIPTION

     The vhold() function increments the v_holdcnt of the given vnode.  If the
     vnode has already been added to the free list and is still referenced, it
     will be removed.

     The vdrop() and vdropl() functions decrement the v_holdcnt of the vnode.
     If the holdcount is less than or equal to zero prior to calling vdrop()
     or vdropl(), the system will panic.  If the vnode is no longer
     referenced, it will be freed.

     The difference between vdrop() and vdropl() is that vdrop() locks the
     vnode interlock and then calls vdropl() while vdropl() expects the
     interlock to already be locked.

SEE ALSO

     vbusy(9), vfree(9)

AUTHORS

     This manual page was written by Chad David 〈davidc@acns.ab.ca〉.