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Date: Fri, 25 Sep 1998 11:45:46 -0700 (PDT)
From: Matthew Dillon <dillon@backplane.com>
Message-Id: <199809251845.LAA26836@apollo.backplane.com>
To: committers@FreeBSD.ORG
Subject: VM fix for write()/mmap() corruption PR going in later today
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    It looks like the fix is working.  I'm hoping to get confirmation from
    another party later today and then intend to commit it.

    The patch will consist of clearing B_RELBUF in brelse() if B_DELWRI is
    set, just prior to the VMIO buffer rundown, basically:

       /*
        * Clear B_RELBUF if B_DELWRI is set.  We absolutely
        * cannot call vfs_vmio_release() if B_DELWRI is set or we may
        * lose data writes.
        */
       if (bp->b_flags & B_DELWRI)
               bp->b_flags &= ~B_RELBUF;
 
    The patch will be commited into -current later today.   I would also like
    to commit the patch to -stable so it gets into 2.2.8 as there have also 
    been reports of the corruption occuring on -stable systems.  I have also
    tested it on one of our other -stable based news machines and it seems to
    do no harm.

    Does anyone have any objections to my commiting the patch into -stable
    as well?

						-Matt