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

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Message-ID: <4AE5DC80.8010204@oracle.com>
Date:	Mon, 26 Oct 2009 10:29:36 -0700
From:	Sunil Mushran <sunil.mushran@...cle.com>
To:	Jamie Lokier <jamie@...reable.org>
CC:	Mark Fasheh <mfasheh@...e.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

Jamie Lokier wrote:
> 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.

I'm probably not understanding your point. Won't the older kernels not set
FIEMAP_EXTENT_NOT_SHARED too.

If this is important, we could always add this flag in the stable kernel
trees. Both sharing of extents and fiemap are relatively new to the kernel.

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