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diff --git a/sys/sys/mbuf.h b/sys/sys/mbuf.h
--- a/sys/sys/mbuf.h
+++ b/sys/sys/mbuf.h
@@ -1138,6 +1138,11 @@
(!(((m)->m_flags & M_EXT)) || \
(m_extrefcnt(m) == 1)))
+/* Similar to M_WRITABLE but permit writing to M_EXTPG mbufs. */
+#define M_WRITABLE_EXTPG(m) \
+ (((m)->m_flags & M_RDONLY) == 0 && \
+ (!(((m)->m_flags & M_EXT)) || (m_extrefcnt(m) == 1)))
+
/* Check if the supplied mbuf has a packet header, or else panic. */
#define M_ASSERTPKTHDR(m) \
KASSERT((m) != NULL && (m)->m_flags & M_PKTHDR, \

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