Re: list subvolumes with new btrfs command

[C Anthony Risinger <anthony@extof.me>]

On Mon, Apr 26, 2010 at 3:51 PM, C Anthony Risinger <anthony@extof.me> =
wrote:
> On Mon, Apr 26, 2010 at 2:10 PM, C Anthony Risinger <anthony@extof.me=
> wrote:
>> On Mon, Apr 26, 2010 at 12:58 PM, Hubert Kario <hka@qbs.com.pl> wrot=
e:
>>> On Monday 26 April 2010 19:23:21 C Anthony Risinger wrote:
>>>> > I am using ubuntu-10.04-rc with kernel compiled from the almost
>>>> > lastest source , the btrfs-progs is latest too.
>>>> >
>>>> > You can modify line
>>>> >
>>>> > =A0fprintf(stderr, "ERROR: can't perform the search\n");
>>>> > to
>>>> > =A0fprintf(stderr, "ERROR: can't perform the search: %s\n",
>>>> > strerror(errno));
>>>> >
>>>> > to see what happened on earth.
>>>>
>>>> nice:
>>>>
>>>> $ sudo btrfs subvolume list /
>>>> ERROR: can't perform the search: Inappropriate ioctl for device
>>>>
>>>> i'm not really familiar with C, or anything this low level, does t=
his
>>>> help you diagnose my problem?
>>>
>>> Have you tried to run it on the device with the btrfs, not the moun=
t point?
>>>
>>> It looks like the ioctl was made too restrictive about its argument=
s.
>>
>> ah yes i missed mentioning that to, tried that:
>>
>> $ sudo btrfs sub list /dev/sda2
>> ERROR: '/dev/sda2' is not a subvolume
>>
>> no dice :(
>
> i tried setting up loopback with a newly formatted btrfs image +
> mounting, same result: Inappropriate ioctl for device. =A0same error
> whether i point the command at the default subvolume or a snapshot.
> is there anything (missing) i should check in regards to my kernel
> (module/progs mismatch)?

bleh, looks like my kernel didn't have what it needed; i thought
2.6.33/stock Arch kernel was recent enough.  i booted an 2.6.34rc5
kernel any everything works now:

$ sudo btrfs sub list /
ID 259 top level 5 path vps/var/lib/vps-lxc/tpl/arch-nano
ID 260 top level 5 path vps/var/lib/vps-lxc/dom/dom1

heh, i forgot about those snapshots :-).  i will compensate for this
possibility in my initrd hook.

apologies for the noise.  on a parting note, the "strerror(errno)" was
a nice change, and might be a useful addition for others, as it also
pointed my in the right direction for permission problems (without
sudo/non-super):

$ btrfs sub list /
ERROR: can't perform the search: Operation not permitted

other than that, thanks for the assistance; the new btrfs tool is nice.

C Anthony
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