dmu_assign_arcbuf_by_dnode
err = dmu_assign_arcbuf_by_dnode(DB_DNODE(dbuf), offset, buf, tx);
err = dmu_assign_arcbuf_by_dnode(dn, drrw->drr_offset, abuf, tx);
int dmu_assign_arcbuf_by_dnode(dnode_t *handle, uint64_t offset,
(void) dmu_assign_arcbuf_by_dnode(sl->sl_zvol_dn_hdl,