On Thu, Aug 02, 2012 at 03:40:03PM +0200, David Sterba wrote:
> On Tue, Jul 31, 2012 at 06:01:04PM -0700, Marc MERLIN wrote:
> > On Tue, Jul 31, 2012 at 11:04:12AM -0700, Marc MERLIN wrote:
> > > My kernel crashed for some other reason, and now I can't mount my btrfs
> > > filesystem.
> > > I don't care about the data, it's backed up.
> > >
> > > I'll compile a 3.5 kernel, but is there any info you'd like off that
> > > filesystem to see why btrfs is crashing on mount?
> >
> > On the plus side, 3.5 mounted the filesystem:
> > [ 183.069179] device label btrfs_pool1 devid 1 transid 20769 /dev/mapper/test
> > [ 183.087805] btrfs: disk space caching is enabled
> > [ 183.224784] btrfs: no dev_stats entry found for device /dev/mapper/test (devid 1) (OK on first mount after mkfs)
> > [ 186.277795] Btrfs detected SSD devices, enabling SSD mode
> > [ 188.477443] btrfs: unlinked 6 orphans
> > [ 188.477451] btrfs: truncated 1 orphans
> > [ 411.837015] btrfs: unlinked 13 orphans
> > [ 414.373500] btrfs: unlinked 35 orphans
>
> there's this commit in 3.5 that looks like it fixed the problem:
>
> Author: Josef Bacik <jbacik@xxxxxxxxxxxx>
> AuthorDate: Wed Jun 27 15:10:56 2012 -0400
>
> Btrfs: fix tree log remove space corner case
>
> The tree log stuff can have allocated space that we end up having split
> across a bitmap and a real extent. The free space code does not deal with
> this, it assumes that if it finds an extent or bitmap entry that the entire
> range must fall within the entry it finds. This isn't necessarily the case,
> so rework the remove function so it can handle this case properly. This
> fixed two panics the user hit, first in the case where the space was
> initially in a bitmap and then in an extent entry, and then the reverse
> case. Thanks,
Indeed. Thanks for finding this David and thanks for writing this Josef :)
Marc
--
"A mouse is a device used to point at the xterm you want to type in" - A.S.R.
Microsoft is to operating systems ....
.... what McDonalds is to gourmet cooking
Home page: http://marc.merlins.org/
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