Re: btrfsck: backpointer mismatch (and multiple other errors)

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On Sat, Apr 2, 2016 at 10:02 PM, Kai Krakow <hurikhan77@xxxxxxxxx> wrote:
> Am Sat, 2 Apr 2016 18:14:17 -0600

> Also I think, having options nossd+autodefrag+lzo shouldn't be an
> exotic or unsupported option. Having this on top of bcache should just
> work.

I'm not suggesting it shouldn't work. But in fact something isn't
working. Bugs happen. Regressions happen. This is a process of
elimination project to find out either why, or under what
condition(s), it doesn't work.


> Does it make sense while I still have the corruptions in the FS? I'd
> like to wait for Qu whether I should recreate the FS or whether I
> should take some image, or send info to improve btrfsck...

It's up to you. I think it's fair to say the file system should not be
corrupting files so long as it's willing to write to the volume. So
that's a problem in and of itself; it should sooner go read only.

It's completely reasonable to take a btrfs-image, back everything up,
and then try a 'btrfs check --repair' and see if it can fix things up.
If not, that makes the btrfs-image more valuable.



> I think the latter two are easily the least probable sort of bugs. But
> I'll give it a try. For the time being, I could switch bcache to
> write-around mode - so it could at least not corrupt btrfs during
> writes.

I don't know enough about bcache to speculate what can happen if there
are already fs corruptions. Is it possible bcache makes things worse?
No idea.


-- 
Chris Murphy
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