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From: Liu Bo <liubo2009@cn.fujitsu.com>
To: kreijack@inwind.it
Cc: "Matthias G. Eckermann" <mge@suse.com>, Alex <alex@bpmit.com>,
	linux-btrfs@vger.kernel.org
Subject: Re: Create subvolume from a directory?
Date: Thu, 29 Mar 2012 09:24:44 +0800	[thread overview]
Message-ID: <4F73B9DC.3040402@cn.fujitsu.com> (raw)
In-Reply-To: <4F734250.5030009@libero.it>

On 03/29/2012 12:54 AM, Goffredo Baroncelli wrote:
>>
> 
> Could you elaborate which would be the issue ?
> "cp --reflink"-ing a file is not different than snapshotting a file. In
> any case I could mount a snapshot and not the source subvolume.
> 
> 
> 

We already have a debate about this "cross-link device":
http://comments.gmane.org/gmane.comp.file-systems.btrfs/9864

"cp --reflink" will use clone feature, which can share data among files, but metadata is preserved individually.

My case is that I can mount both a subvolume and a snapshot via "-o subvol=xxx" or "-o subvolid=xxx".

thanks,
liubo

  reply	other threads:[~2012-03-29  1:24 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-03-27 17:19 Create subvolume from a directory? Alex
2012-03-27 20:42 ` Chester
2012-03-27 22:24 ` Matthias G. Eckermann
2012-03-28  1:46   ` Fajar A. Nugraha
2012-03-28  9:20     ` David Sterba
2012-03-28  2:18   ` Liu Bo
2012-03-28 16:54     ` Goffredo Baroncelli
2012-03-29  1:24       ` Liu Bo [this message]
2012-05-01 17:09         ` Hubert Kario
2012-05-02 16:33           ` David Sterba
2012-05-03 13:26             ` Hubert Kario
2012-05-14 12:36               ` David Sterba
2012-03-28  9:24 ` David Sterba
2012-03-28 11:11   ` Alex

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