Re: can subvolumes be specified as compressed?

[Miao Xie <miaox@cn.fujitsu.com>]

On Thu, 29 Jul 2010 15:50:28 +0800, Wang Shaoyan wrote:
> Hi.
> I want a subvolume in root to be compressed, I try to do this:
> # mkfs.btrfs /dev/sda8
> # mount /dev/sda8 /home/usr/btrfs
> # cd /home/usr/btrfs
> # btrfs subvolume create mysubvolume
> # mount -o compress,subvol=mysubvolume /dev/sda8 some_dir_in_root
> but when I create a file in some_dir_in_root, the file isn't
> compressed at all. why? How can I specify some subvolumes to be
> compressed, and the others Not to be compressed in a single btrfs?

The method that you said is right, by this way, I can create a compressed file
on the specified subvolume.

I think your file has been compressed or is hard to be compressed, so
you found it isn't compressed at all. Just like we use a zip tool to compress
a compressed file, we will find the file isn't compressed at all.

Thanks
Miao

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> Wang Shaoyan
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