Re: compression on external hard drive?

["xavier.gnata@gmail.com" <xavier.gnata@gmail.com>]

On 05/26/2013 04:23 AM, Duncan wrote:
> Xavier Gnata posted on Sun, 26 May 2013 00:11:55 +0200 as excerpted:
>
>> Nowdays, external hard drives are mounted automagically by kde, gnome or
>> whatever else.
>> How is it suppose to work with external hard drives using btrfs with
>> compression?
>> If a btrfs filesystem lzo-compressed is mounted without the
>> |compress=|xxx option then all the newly created files are uncompressed,
>> aren't then?
>> Would it be possible to detect if a file system is compressed  and to
>> mount it *automatically* and accordingly (except otherwise explicitly
>> stated by the user) with/without the lzo/gzip option?
> There's a proposal to do something like ext3/4's default options as set
> by tune2fs, at some point, presumably before btrfs loses the "unstable
> disk format" and under heavy development warnings.  However, there's
> nothing like that yet, AFAIK, so most options must be set per-mount.
>
> There's a lot you can do with udev events, however, and strongly suspect
> either compression-detection, or match-against-a-list-and-compress (or
> don't compress if the default is compression otherwise) if the UUID/LABEL
> is listed.
>
> Alternatively, at least kde can be set not to automount specific UUIDs/
> LABELs, and then there's always the traditional fstab option, and I think
> either fstab entered drives are ignored by the automount system or
> they're automounted with options from fstab (I have that kde subsystem
> entirely disabled here so it doesn't automount anything, so I'm not sure
> which it actually does).
>
Ok I'm going to play with udev event and have a lot at what kde4.10.3 
can do.
However, I hope this will be solved at fs level once the dust has settled.

Xavier