cvs commit: src/sys/sys mbuf.h src/sys/kern uipc_mbuf.c
andre at freebsd.org
Mon Aug 29 20:19:47 GMT 2005
Andre Oppermann wrote:
> andre 2005-08-29 20:15:33 UTC
> FreeBSD src repository
> Modified files:
> sys/sys mbuf.h
> sys/kern uipc_mbuf.c
> Add m_copymdata(struct mbuf *m, struct mbuf *n, int off, int len,
> int prep, int how).
> Copies the data portion of mbuf (chain) n starting from offset off
> for length len to mbuf (chain) m. Depending on prep the copied
> data will be appended or prepended. The function ensures that the
> mbuf (chain) m will be fully writeable by making real (not refcnt)
> copies of mbuf clusters. For the prepending the function returns
> a pointer to the new start of mbuf chain m and leaves as much
> leading space as possible in the new first mbuf.
This one is primarily for the new TCP reassembly which makes very
efficient use of mbufs.
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