Re: Btrfs trees for linux-next

Kay Sievers
2008-12-16T01:39:57Z

On Tue, Dec 16, 2008 at 02:37, Chris Mason <chris.mason@oracle.com> wrote:
> On Mon, 2008-12-15 at 23:55 +0100, Kay Sievers wrote:
>> On Mon, Dec 15, 2008 at 22:03, Andreas Dilger <adilger@sun.com> wrote:
>> > On Dec 11, 2008 09:43 -0500, Chris Mason wrote:
>> >> The multi-device code uses a very simple brute force scan from userland
>> >> to populate the list of devices that belong to a given FS. Kay Sievers
>> >> has some ideas on hotplug magic to make this less dumb. (The scan isn't
>> >> required for single device filesystems).
>> >
>> > This should use libblkid to do the scanning of the devices, and it can
>> > cache the results for efficiency. Best would be to have the same LABEL+UUID
>> > for all devices in the same filesystem, and then once any of these devices
>> > are found the mount.btrfs code can query the rest of the devices to find
>> > the remaining parts of the filesystem.
>>
>> Which is another way to do something you should not do that way in the
>> first place, just with a library instead of your own code.
>>
>
> Well, its the same library everyone else is using to do things they
> shouldn't be doing ;)

Util-linux-ng can be configured to use libvolume_id and udev data, and
it's not used in SUSE and Ubuntu for exactly the reason mentioned. :)

Kay