Author: rpokala Date: Thu Jan 12 06:38:03 2017 New Revision: 311963 URL: https://svnweb.freebsd.org/changeset/base/311963
Log: Remove writability requirement for single-mbuf, contiguous-range m_pulldown() m_pulldown() only needs to determine if a mbuf is writable if it is going to copy data into the data region of an existing mbuf. It does this to create a contiguous data region in a single mbuf from multiple mbufs in the chain. If the requested memory region is already contiguous and nothing needs to change, the mbuf does not need to be writeable. Submitted by: Brian Mueller <bmuel...@panasas.com> Reviewed by: bz MFC after: 1 week Sponsored by: Panasas Differential Revision: https://reviews.freebsd.org/D9053 Modified: head/sys/kern/uipc_mbuf2.c Modified: head/sys/kern/uipc_mbuf2.c ============================================================================== --- head/sys/kern/uipc_mbuf2.c Thu Jan 12 06:30:44 2017 (r311962) +++ head/sys/kern/uipc_mbuf2.c Thu Jan 12 06:38:03 2017 (r311963) @@ -159,7 +159,7 @@ m_pulldown(struct mbuf *m, int off, int * the target data is on <n, off>. * if we got enough data on the mbuf "n", we're done. */ - if ((off == 0 || offp) && len <= n->m_len - off && writable) + if ((off == 0 || offp) && len <= n->m_len - off) goto ok; /* _______________________________________________ svn-src-head@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
