Date: Sat, 12 Jul 2003 20:34:01 +0100
From: Jamie Lokier <jamie@shareable.org>
To: Jeff Garzik <jgarzik@pobox.com>
Cc: Andrew Morton <akpm@osdl.org>, davej@codemonkey.org.uk,
       linux-kernel@vger.kernel.org
Subject: Re: 2.5 'what to expect'
Message-ID: <20030712193401.GD10450@mail.jlokier.co.uk>
References: <20030711140219.GB16433@suse.de> <20030712152406.GA9521@mail.jlokier.co.uk> <3F103018.6020008@pobox.com> <20030712112722.55f80b60.akpm@osdl.org> <20030712183929.GA10450@mail.jlokier.co.uk> <3F105B9A.7070803@pobox.com>
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Jeff Garzik wrote:
> These are separate db4+kernel problems.
> 
> The first is that there needs to be a reliable way to know if O_DIRECT 
> writes are going to succeed or not.  The 2.4 kernel fails on write(2) 
> but not open(2) or fcntl(2).
> 
> The second is that db4 doesn't appear to know about the alignment 
> requirement.

The alignment requirement can be probed if necessary - by reading a
misaligned page.  It's ugly, but fixable in db4.

2.4 fails on write()?  A strace of "rpm --rebuilddb" shows it is
opening with O_DIRECT and writing just fine.  Or does that only work
with RedHat's 2.4 kernels?

-- Jamie
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