From: Jeff Liu <jeff.liu@oracle.com>
To: "Gábor Nyers" <gnyers@suse.com>
Cc: Liu Bo <liub.liubo@gmail.com>, linux-btrfs@vger.kernel.org
Subject: Re: How to find (out if) files sharing content?
Date: Wed, 31 Oct 2012 10:30:22 +0800 [thread overview]
Message-ID: <50908D3E.3000609@oracle.com> (raw)
In-Reply-To: <5090736C.5040609@oracle.com>
On 10/31/2012 08:40 AM, Liu Bo wrote:
> On 10/30/2012 11:20 PM, Gábor Nyers wrote:
>> Hi,
>>
>> How could one find out if 2 files share any extents on a btrfs file system?
>>
>> A more generic variation of the above: How to list files on the same
>> file system/subvolume sharing content?
One idea is to mark those cloned extents as FIEMAP_EXTENT_SHARED so that
we can go through a file to figure out how many extents are shared
through fiemap(2), and calculate the real storage(fs/subvolume) footprint
in the end.
Thanks,
-Jeff
>>
>
> Indeed ocfs2 already has the feature where you can get shared parts via 'du',
> we're planning to support this in btrfs, too.
>
> thanks,
> liubo
>
>> Thanks,
>> Gábor
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in
>> the body of a message to majordomo@vger.kernel.org
>> More majordomo info at http://vger.kernel.org/majordomo-info.html
>>
>
next prev parent reply other threads:[~2012-10-31 2:31 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-30 15:20 How to find (out if) files sharing content? Gábor Nyers
2012-10-30 15:39 ` Hugo Mills
2012-10-30 15:58 ` Jan Schmidt
2012-10-31 0:40 ` Liu Bo
2012-10-31 2:30 ` Jeff Liu [this message]
2012-10-31 11:31 ` David Sterba
2012-10-31 13:02 ` Jeff Liu
2012-11-05 22:45 ` David Sterba
2012-11-06 3:53 ` Jeff Liu
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