[Qemu-discuss] Antw: fsfreeze: not smart enough about duplicate/bind mounts?

[Steffen Weißgerber]

>>> Christian Theune <address@hidden> schrieb am Dienstag, 15. März
2016 um
16:48:
> Hi,
> 

Hi,

> I just stumbled over a situation where fsfreeze wasn*t smart enough
to 
> notice that it tried to freeze the same filesystem twice (which ends
in a 
> *device or resource busy*).
> 
> Here*s how the mount looked like:
> 
> /dev/vda1 on / type xfs (rw,relatime,attr2,inode64,noquota)
> /dev/vda1 on /nix/store type xfs (ro,relatime,attr2,inode64,noquota)
> 
> I see that Qemu has support for detecting bind mounts, and this
_should_ be 
> one, but I guess it*s really not. At least from what I can tell.
> 

It's XFS not Qemu, I think. When mounting an already mounted XFS
volume
read only nevertheless the mount process tries to recover the journal.

You can avoid this with the norecovery option (mount -o
ro,norecovery).

> For now, I*m running without the second mount to make things work,
but it 
> would be really nice if the guest agent could be improved.
> 
> Cheers!
> Christian
> 

Regards

Steffen

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