snapacct_ufs1
if ((error = snapacct_ufs1(vp, oldblkp, lastblkp, fs, lblkno, exptype)))
static int snapacct_ufs1(struct vnode *, ufs1_daddr_t *, ufs1_daddr_t *,
error = expunge_ufs1(vp, xp, fs, snapacct_ufs1,