Date: Mon, 29 Aug 2005 22:19:55 +0200 From: Andre Oppermann <andre@freebsd.org> To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/sys mbuf.h src/sys/kern uipc_mbuf.c Message-ID: <43136DEB.B59F9276@freebsd.org> References: <200508292015.j7TKFYuW094247@repoman.freebsd.org>
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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 > Log: > 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. -- Andre
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