Re: Compession, on filesystem or volume?

[Liu Bo <liubo2009@cn.fujitsu.com>]

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