subvolume nomenclature

subvolume nomenclature

[Brian J. Murrell]

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I seem to have the following subvolumes of my filesystem:

# btrfs sub li /
ID 256 top level 5 path @
ID 257 top level 5 path @home
ID 258 top level 5 path @/etc/apt/oneiric

I *think* the last one is there due to a:

# btrfsctl -s oneiric /

that I did prior to doing an upgrade.  I can't seem to figure out the
nomenclature to delete it though:

# btrfs sub de /@/etc/apt/oneiric
ERROR: error accessing '/@/etc/apt/oneiric'

I've tried lots of other combinations with no luck.

Can anyone give me a hint (or the answer :-) )?

Cheers,
b.


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Re: subvolume nomenclature

[cwillu]

On Fri, Mar 2, 2012 at 7:31 AM, Brian J. Murrell <brian@interlinx.bc.ca=
> wrote:
> I seem to have the following subvolumes of my filesystem:
>
> # btrfs sub li /
> ID 256 top level 5 path @
> ID 257 top level 5 path @home
> ID 258 top level 5 path @/etc/apt/oneiric
>
> I *think* the last one is there due to a:
>
> # btrfsctl -s oneiric /
>
> that I did prior to doing an upgrade. =C2=A0I can't seem to figure ou=
t the
> nomenclature to delete it though:
>
> # btrfs sub de /@/etc/apt/oneiric

Try btrfs sub delete /etc/apt/oneiric, assuming that that's the path
where you actually see it.
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Re: subvolume nomenclature

[Brian J. Murrell]

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On 12-03-02 08:36 AM, cwillu wrote:
> 
> Try btrfs sub delete /etc/apt/oneiric, assuming that that's the path
> where you actually see it.

Well, there is a root filesystem at /etc/apt/oneiric:

# ls /etc/apt/oneiric/
bin   etc         initrd.img.old  mnt   root  selinux  tmp  vmlinuz
boot  home        lib             opt   run   srv      usr  vmlinuz.old
dev   initrd.img  media           proc  sbin  sys      var

but it doesn't delete:

# btrfs subvolume delete /etc/apt/oneiric
Delete subvolume '/etc/apt/oneiric'
ERROR: cannot delete '/etc/apt/oneiric' - Device or resource busy

and doesn't unmount:

# umount /etc/apt/oneiric
umount: /etc/apt/oneiric: not mounted

Cheers,
b.


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Re: subvolume nomenclature

[cwillu]

On Fri, Mar 2, 2012 at 1:44 PM, Brian J. Murrell <brian@interlinx.bc.ca=
> wrote:
> On 12-03-02 08:36 AM, cwillu wrote:
>>
>> Try btrfs sub delete /etc/apt/oneiric, assuming that that's the path
>> where you actually see it.
>
> Well, there is a root filesystem at /etc/apt/oneiric:
>
> # ls /etc/apt/oneiric/
> bin =C2=A0 etc =C2=A0 =C2=A0 =C2=A0 =C2=A0 initrd.img.old =C2=A0mnt =C2=
=A0 root =C2=A0selinux =C2=A0tmp =C2=A0vmlinuz
> boot =C2=A0home =C2=A0 =C2=A0 =C2=A0 =C2=A0lib =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 opt =C2=A0 run =C2=A0 srv =C2=A0 =C2=A0 =C2=A0usr =C2=
=A0vmlinuz.old
> dev =C2=A0 initrd.img =C2=A0media =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
proc =C2=A0sbin =C2=A0sys =C2=A0 =C2=A0 =C2=A0var
>
> but it doesn't delete:
>
> # btrfs subvolume delete /etc/apt/oneiric
> Delete subvolume '/etc/apt/oneiric'
> ERROR: cannot delete '/etc/apt/oneiric' - Device or resource busy

root@repository:~/foo$ btrfs sub create bar
Create subvolume './bar'
root@repository:~/foo$ cd bar
root@repository:~/foo/bar$ btrfs sub del /home/cwillu/foo/bar
Delete subvolume '/home/cwillu/foo/bar'
ERROR: cannot delete '/home/cwillu/foo/bar' - Device or resource busy


It's likely there's at least one process with an open handle to that
subvolume (even just a shell that as its current working directory).
lsof | grep /etc/apt/oneiric should tell you what you need.
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