Re: btrfs 3.16.2 does not recognize subvolumes correctly

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On Fri, Oct 03, 2014 at 12:40:33PM +0200, Jogi Hofmüller wrote:
> Hi all,
> 
> First of all, I am talking about btrfs-progs 3.16.2 if there was any doubt.
> 
> I did some more checking and found the following disturbing results.
> 
> I can still create snapshots of subvolumes and the default subvolume (/)
> without problems.  But sending the snapshot fails with the error:
> 
> ERROR: /.SNAPSHOT doesn't belong to btrfs mount point
> 
> btrfs subvolume list -a /
> 
> ID 259 gen 21444 top level 5 path home
> ID 260 gen 21443 top level 5 path var
> ID 742 gen 18830 top level 5 path .SNAPSHOT
> ID 743 gen 18832 top level 259 path home/.SNAPSHOT
> 
> But then again e.g.
> 
> btrfs subvolume show /home
> ERROR: /home doesn't belong to btrfs mount point
> 
> All this is happening on my laptop running kernel 3.16.3. (Debian).
> 
> Interestingly enough I have another machine where only the default
> subvolume makes problems but another subvolume can be snapshotted and
> the snapshot send.  This machine uses kernel 3.14.15.
> 
> Please let me know what I can do to fix this.

There was a similar issue in btrfs-progs 3.16 that was fixed in 3.16.1 by this
commit:
https://git.kernel.org/cgit/linux/kernel/git/mason/btrfs-progs.git/commit/?id=6a47725a6fb8a463dd60611800222c7297195588

I'd do a quick `btrfs --version` just to make sure you're running the version
you think you are. Otherwise, the output of `mount` might shed some light on why
you're getting this.

-- 
Omar
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