From: David Sterba <dsterba@suse.cz>
To: Liu Bo <bo.li.liu@oracle.com>
Cc: linux-btrfs@vger.kernel.org, jeff.liu@oracle.com
Subject: Re: [PATCH v3] Btrfs: export btrfs space shared info to userspace
Date: Mon, 16 Sep 2013 13:52:07 +0200 [thread overview]
Message-ID: <20130916115207.GS6810@suse.cz> (raw)
In-Reply-To: <1379323965-21693-1-git-send-email-bo.li.liu@oracle.com>
On Mon, Sep 16, 2013 at 05:32:45PM +0800, Liu Bo wrote:
> Similar to ocfs2, btrfs also supports that extents can be shared by
> different inodes, and there are some userspace tools requesting
> for this kind of 'space shared infomation'.[1]
>
> ocfs2 uses flag FIEMAP_EXTENT_SHARED, so does btrfs.
>
> [1]: http://thr3ads.net/ocfs2-devel/2010/09/489052-PATCH-3-3-shared-du-using-fiemap-to-figure-up-the-shared-extents-per-file-and-the-footprint-in
>
> Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.cz>
prev parent reply other threads:[~2013-09-16 11:52 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-16 9:32 [PATCH v3] Btrfs: export btrfs space shared info to userspace Liu Bo
2013-09-16 11:52 ` David Sterba [this message]
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