linux-kernel - Re: [Ocfs2-devel] [PATCH 1/2] fiemap: Add new extent flag FIEMAP_EXTENT

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Message-ID: <20091024183039.GB30762@shareable.org>
Date:	Sat, 24 Oct 2009 19:30:39 +0100
From:	Jamie Lokier <jamie@...reable.org>
To:	Mark Fasheh <mfasheh@...e.com>
Cc:	Sunil Mushran <sunil.mushran@...cle.com>,
	ocfs2-devel@....oracle.com, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [Ocfs2-devel] [PATCH 1/2] fiemap: Add new extent flag FIEMAP_EXTENT_SHARED

Mark Fasheh wrote:
> On Wed, Oct 21, 2009 at 06:05:08PM -0700, Sunil Mushran wrote:
> > Patch adds flag FIEMAP_EXTENT_SHARED to denote extents that are
> > shared with other inodes.
> 
> This looks pretty sane to me. Thanks Sunil.

It might be better to have a flag FIEMAP_EXTENT_NOT_SHARED.

Apps which need to know the data is not shared can't safely check
!(flags & FIEMAP_EXTENT_SHARED) because of old kernels which don't set
the flag.

-- Jamie
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