On Tue, Nov 08, 2011 at 03:08:41PM -0200, Gustavo Sverzut Barbieri wrote:
> On Tue, Nov 1, 2011 at 9:20 PM, Gustavo Sverzut Barbieri
> <barbi...@gmail.com> wrote:
> > On Tue, Nov 1, 2011 at 7:57 PM, Alexandre Oliva <ol...@lsd.ic.unicamp.br> 
> > wrote:
> >> Hi, Gustavo,
> >>
> >> On Nov  1, 2011, Gustavo Sverzut Barbieri <barbi...@gmail.com> wrote:
> >>
> >>>   btrfs csum failed ino 2957021 extent 85041815552 csum 667310679
> >>> wanted 0 mirror 0
> >>
> >>> Is there any way to recover it?  :-S
> >>
> >> Did you try mounting without data checksums?
> >
> > Just tried to mount with -o nodatasum, no luck. Is that enough?
> 
> Ideas? Should I give up and consider data lost? :-(

We actually check the crcs even when mounted with nodatasum.  Can you
give the restore tool a shot from my current btrfs-progs git repo?  If
it can read it we can find a way to get the files off.

-chris

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