[DRBD-user] drbd 8.0pre5 Lower device is already mounted

Ralf Schenk rs at databay.de
Mon Oct 2 17:10:30 CEST 2006


Philipp Reisner schrieb:
> Am Montag, 2. Oktober 2006 15:53 schrieb Ralf Schenk:
>> Philipp Reisner schrieb:
>>> Could you please retry with this pach:
>>>
>>> phil at mescal:~/src/drbd08/drbd$ svn diff
>>> Index: drbd_nl.c
>>> ===================================================================
>>> --- drbd_nl.c   (revision 2482)
>>> +++ drbd_nl.c   (working copy)
>>> @@ -671,6 +671,8 @@
>>>
>>>         nbc->backing_bdev = inode->i_bdev;
>>>         if (bd_claim(nbc->backing_bdev, mdev)) {
>>> +               WARN("Backing device hold by: %s\n",
>>> +                    nbc->backing_bdev->bd_holder);
>>>                 retcode=LDMounted;
>>>                 goto fail;
>>>         }
>>>
>>>
>>> And see what ends up in the kernel log ?
>> Hello !
>>
>> Thanks for your fast reply...
>> Thats what I get now:
>> Oct  2 15:42:27 xeon2 kernel: drbd: initialised. Version: 8.0pre5
>> (api:84/proto:83)
>> Oct  2 15:42:27 xeon2 kernel: drbd: SVN Revision: 2482M build by
>> root at ubuntu_devel, 2006-10-02 15:38:45
>> Oct  2 15:42:27 xeon2 kernel: drbd: registered as block device major 147
>> Oct  2 15:43:05 xeon2 kernel: drbd0: Backing device hold by:
>> Oct  2 15:43:05 xeon2 kernel: drbd0: conn( StandAlone -> Unconnected )
>> Oct  2 15:43:05 xeon2 kernel: drbd0: receiver (re)started
>> Oct  2 15:43:05 xeon2 kernel: drbd0: conn( Unconnected -> WFConnection )
>>
>> No answers here....
>>
>> But perhaps that helps:
>> Ubuntu (6.06 Dapper Server) uses evms as addon for logical volume
>> management. They use a kernel patch to make that work with later 2.6
>> kernels. Since I built my kernel on my own but wanted to stay with that
>> functionality I applied their kernel-patch manually. Perhaps that
>> conflicts with your way of checking if a device is already in use...
>>
>> I attach the small patch.
> 
> It seems that something else has already claimed that block device.
> Strange. Can you mkfs and mount that device ?

Yes, of course. It already contains a file system and a whole virtual
server which is not in production. I was reading the bd_claim kernel
function modified by the ubuntu patch to see if the results are the
problem. I'm not a c programmer...

But I think your code
        if (bd_claim(nbc->backing_bdev, mdev)) {
                WARN("Backing device hold by: %s\n",
                    nbc->backing_bdev->bd_holder);
                retcode=LDMounted;
                goto fail;
        }

gets back -EBUSY all the time but nbc->backing_bdev->bd_holder is empty.


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Ralf Schenk
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