Re: kernel panic using external journal and snapshots

[Zheng Liu <gnehzuil.liu@gmail.com>]

On Sat, Nov 23, 2013 at 12:30:48PM -0800, Gordon Messmer wrote:
> On 11/21/2013 11:11 PM, Zheng Liu wrote:
> >For the first question, I haven't a LVM device on my hand.  Hence I am
> >not sure whether there is a bug or not.
> >
> >For the second one, I do a test on my sand box against Linux-3.12-rc5,
> >and it works well.  So I think maybe you can try it again on a newer
> >kernel.
> 
> The problem manifests when a filesystem which uses external journal
> and its snapshot are simultaneously mounted.  If you don't have an
> LVM device with which to create a snapshot, I'm not sure what you're
> testing.  Could you clarify?

Ah, sorry, I don't clarify my test.  I just split two partitions on a
hard disk and create a ext4 file system with external journal.  Then I
use tune2fs with '-O ^has_journal' to remove external journal.  After
that I try to mount this file system on 3.12-rc5, and it work well.
That's all I have done.

Thanks,
                                                - Zheng