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From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Dave Chinner <david@fromorbit.com>
Subject: Re: xfs bug in 2.6.26-rc9
Date: Tue, 15 Jul 2008 16:17:58 +1000
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Cc: Lachlan McIlroy <lachlan@sgi.com>, Mikael Abrahamsson <swmike@swm.pp.se>,
       linux-kernel@vger.kernel.org, xfs@oss.sgi.com, linux-mm@kvack.org
References: <alpine.DEB.1.10.0807110939520.30192@uplift.swm.pp.se> <487B019B.9090401@sgi.com> <20080714121332.GX29319@disturbed>
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On Monday 14 July 2008 22:13, Dave Chinner wrote:

> Christoph and I were contemplating this problem with ->page_mkwrite
> reecently. The problem is that we can't, right now, return an
> EAGAIN-like error to ->page_mkwrite() and have it retry the
> page fault. Other parts of the page faulting code can do this,
> so it seems like a solvable problem.
>
> The basic concept is that if we can return a EAGAIN result we can
> try-lock the inode and hold the locks necessary to avoid this race
> or prevent the page fault from dirtying the page until the
> filesystem is unfrozen.
>
> Added linux-mm to the cc list for discussion.

It would be easily possible to do, yes.
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