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VOPs do. Layered file systems no longer have to modify bp->b_vp and run into trouble when an async VOP_BWRITE() uses the wrong vnode. - change all occurences of VOP_BWRITE(bp) to VOP_BWRITE(bp->b_vp, bp). - remove layer_bwrite(). - welcome to 5.99.55 Adresses PR kern/38762 panic: vwakeup: neg numoutput No objections from tech-kern@.