From mboxrd@z Thu Jan  1 00:00:00 1970
From: Liu Bo <liubo2009@cn.fujitsu.com>
Subject: Re: Compession, on filesystem or volume?
Date: Thu, 29 Dec 2011 20:35:00 +0800
Message-ID: <4EFC5E74.70600@cn.fujitsu.com>
References: <4EFC4617.5070109@hosman.xs4all.nl> <CAG1y0sf2QFbD5_6xK1iHtdaBLBtZsNFgk1KrTpavNfZQX-CH1w@mail.gmail.com>
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Cc: Remco Hosman <remco@hosman.xs4all.nl>, linux-btrfs@vger.kernel.org
To: "Fajar A. Nugraha" <list@fajar.net>
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On 12/29/2011 07:11 PM, Fajar A. Nugraha wrote:
> On Thu, Dec 29, 2011 at 5:51 PM, Remco Hosman <remco@hosman.xs4all.nl> wrote:
>> Hi,
>>
>> Something i could not find in the documentation i managed to find:
>> if you mount with compress=lzo and rebalance, is compression on for that
>> filesystem or only a single volume?
>>
>> eg, can i have a @boot volume uncompressed and @ and @home compressed.
> 
> Last time I asked a similar question, the answer was no. It's per filesystem.
> 
> however you can change compression of individual files between
> zlib/lzo using "btrfs fi defragment -c", regardless of what the
> filesystem is currently mounted with.
> 

for individual files and directories, we can also set them compress via 
FS_IOC_SETFLAGS.

thanks,
liubo