M_EXT
ASSERT((m->m_flags & M_EXT) != 0);
m->m_flags |= M_EXT;
m->m_flags |= M_EXT;
ASSERT((m->m_flags & M_EXT) != 0);
(MBC)->chain->m_flags |= M_EXT;
ASSERT((m->m_flags & M_EXT) != 0);
if ((mbuf->m_flags & M_EXT) == 0 &&
mbuf->m_flags |= M_EXT;
(m)->m_flags |= M_EXT; \
if ((m)->m_flags & M_EXT) { \
(((m)->m_flags & M_EXT) ? (m)->m_ext.ext_buf : \
(((m)->m_flags & M_EXT) ? (m)->m_ext.ext_size : \