linux-kernel - Re: xfs bug in 2.6.26-rc9

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Message-Id: <200807151617.58329.nickpiggin@yahoo.com.au>
Date:	Tue, 15 Jul 2008 16:17:58 +1000
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Dave Chinner <david@...morbit.com>
Cc:	Lachlan McIlroy <lachlan@....com>,
	Mikael Abrahamsson <swmike@....pp.se>,
	linux-kernel@...r.kernel.org, xfs@....sgi.com, linux-mm@...ck.org
Subject: Re: xfs bug in 2.6.26-rc9

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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