Re: Filesystem not mountable after reset, bad tree block

[Hugo Mills <hugo@carfax.org.uk>]

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On Sat, Jan 07, 2012 at 01:05:08PM +0100, Kai Krakow wrote:
> Hi!
> 
> Michael Andreen <harv@ruin.nu> schrieb:
> > The find-root program seems to think there is a root (and poentially some
> > older roots?), but not sure how to use that information.
> [...]
> > Anything else I can do to debug this or potentially recover a few bits
> > before reformatting?
> 
> You could try the recovery programs from Josefs btrfs-progs tree[1].

   You'll find what little documentation we have on the restore
program here:

   http://btrfs.ipv5.de/index.php?title=Restore

   With luck, you'll just need to run restore, but there's also a
little bit on how to read and use the output of find-root.

   Hugo.

> You 
> could also try using kernel 3.2 which allows mounting in recovery mode. This 
> mode tries to find an older tree root. But I think your kernel did not keep 
> tree root backups for this purpose as it is AFAIR a feature of later 
> kernels.
> 
> Better use a newer kernel - best use 3.2. There are bunch of fixes which 
> improve the situation with lost file systems after unexpected reboots or 
> power outages.
> 
> HTH
> Kai
> 
> [1] https://github.com/josefbacik/btrfs-progs
> 

-- 
=== Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk ===
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     --- Computer Science is not about computers,  any more than ---     
                     astronomy is about telescopes.                      

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