BUG REPORT: XFS LOG FORWARD COMPATIBILITY PROBLEM

[Eric Sandeen]

Lachlan McIlroy wrote:
> Hi Eddy,
> 
> CC'ing this to the xfs list.
> 
> ----- "Eddy Zhao" <eddy.y.zhao at gmail.com> wrote:
> 
>> Hello Felix, Lachlan:
>>
>> I find your names in 2.6.30 Changlog as XFS maintainer. Can you kindly
>> take a look at the problem we are facing.
>>
>> Follow the sequence below to reproduce the problem
>> - write data on 2.6.28 system
>> - unplug usb disk while writing
> I don't recommend you pull the usb disk out while the filesystem is still
> mounted (if you can avoid it).
> 

Unless you have write barriers enabled and passing through to the USB
device, or write cache turned off on the USB device, this test may well
just be corrupting the log to an unreplayable state.

Although I can't explain why, w/o further modification, it seems to
mount again on .28 ...

-Eric