Re: Btrfs hangs 3.19-10

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

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On Mon, Apr 06, 2015 at 10:40:03AM +0300, Pavel Volkov wrote:
> On Sunday, April 5, 2015 1:04:17 PM MSK, Hugo Mills wrote:
> >   That's these, I think:
> >
> >#define BTRFS_FEATURE_INCOMPAT_BIG_METADATA     (1ULL << 5)
> >#define BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF    (1ULL << 6)
> >
> >so it's definitely -O^extref. I don't see where big_metadata comes
> >from, though. That's not a -O option. Try with -O^extref and see where
> >that gets you. (Also, don't mount the FS on a newer kernel -- it may
> >be setting big metadata automatically, although it probably shouldn't
> >do).
> 
> By the way, is there any way to see which options are enabled on a
> local filesystem without having to try mounting it with old kernel
> and checking dmesg?

   btrfs-show-super is the tool for that.

   Hugo.

-- 
Hugo Mills             | Great oxymorons of the world, no. 4:
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