cwillu wrote:
quoted text
> On Wed, Nov 17, 2010 at 8:08 PM, Li Zefan <lizf@cn.fujitsu.com> wrote:
>> Hi Chris,
>>
>> Here's the updated patchset. As I still haven't got a kernel.org
>> account, I have set up a git tree in another public git repository,
>> and I'll use it for now.
>>
>> You can pull from:
>>
>>        git://repo.or.cz/linux-btrfs-devel.git lzo-support
>>
>>
>> Lzo is a much faster compression algorithm than gzib, so would allow
>> more users to enable transparent compression, and some users can
>> choose from compression ratio and compression speed.
>>
>> Usage:
>>
>> # mount -t btrfs -o compress[=<zlib,lzo>] dev /mnt
>> or
>> # mount -t btrfs -o compress-force[=<zlib,lzo>] dev /mnt
>>
>> "-o compress" without argument is still allowed for compatability.
> 
> This doesn't seem to work with -o remount.  "mount / -o
> remount,compress=lzo" fails with "[90192.345382] btrfs: unrecognized
> mount option 'compress=lzo'".  The -clzo option to defrag works fine.
> 

It works for me:

# mount -t btrfs -o compress=zlib /dev/loop1 /mnt
# mount -o remount,compress=lzo /dev/loop1 /mnt
# dmesg
...
device fsid c142fef10429f78f-540f99158993f7a2 devid 1 transid 31 /dev/loop1
btrfs: use zlib compression
btrfs: use lzo compression
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