Extend m_copyback() to support unmapped mbufs.
Reviewed by: gallatin, markj
Sponsored by: Netflix
Differential Revision: https://reviews.freebsd.org/D30133
(cherry picked from commit 3f9dac85cc8f2963026fdc2d5477acb607176a89)
Extend m_copyback() to support unmapped mbufs. Tags None Referenced Files None Subscribers None
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