Re: Another novice question & comment

[Gene Czarcinski <gene@czarc.net>]

On 12/27/2012 11:55 AM, Chris Murphy wrote:
> On Dec 27, 2012, at 9:47 AM, Swâmi Petaramesh <swami@petaramesh.org> wrote:
>
>> Le 27/12/2012 16:03, Hugo Mills a écrit :
>>>    Right now, no, there isn't any way of telling which subvolume is
>>> mounted at a given location.
>> Er... Check "subvol=" here...
>>
>> root@tethys:/# mount | grep btrfs
>> /dev/mapper/VG1-BTR_POOL on / type btrfs
>> (rw,relatime,subvol=UBUNTU/@,autodefrag,compress=lzo)
>> /dev/mapper/VG1-BTR_POOL on /tmp type btrfs
>> (rw,relatime,subvol=UBUNTU/@tmp,compress=lzo)
>> /dev/sda2 on /boot type btrfs (rw,relatime,subvol=UBUNTU/@boot,autodefrag)
>> /dev/mapper/VG1-BTR_POOL on /home type btrfs
>> (rw,relatime,subvol=UBUNTU/@home,autodefrag,compress=lzo)
>> /dev/mapper/VG1-BTR_POOL on /storage type btrfs
>> (rw,relatime,subvol=STORAGE,autodefrag,compress=lzo)
>> /dev/mapper/VG1-BTR_POOL on /data/BIG type btrfs
>> (rw,noatime,subvol=DATA/BIG,compress=lzo)
>
> That would only seem to work with btrfs on LVM which I'd think is uncommon and complicated.
>
Oh thanks for that little reminder that you can put btrfs on an LV.

I am trying to see if I can get grub2 and os-prober to handle btrfs.  
There are a couple of patches out there but they do little if anything.  
The btrfs volumes and subvolumes are "not your father's filesystem" 8-)

I have a little of what is needed working but, the more I look at 
things, the more it looks like some real kludgy hack is going to be 
needed to have something which works with /dev/<whatever> to now use 
UUID=xxx,subvol=name

Gene