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Date: Wed, 8 Jun 2016 14:23:23 +0500
From: Roman Mamedov <rm@romanrm.net>
To: cdlscpmv <cdlscpmv@gmail.com>
Cc: linux-btrfs@vger.kernel.org
Subject: Re: Can't remove read-only snapshot with immutable flag set
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On Wed, 8 Jun 2016 08:37:57 +0000
cdlscpmv <cdlscpmv@gmail.com> wrote:

> It happened that I set the immutable flag (via `chattr +i`) on a subvolum=
e.
> Then I made a read-only snapshot of that subvolume. Now I can't remove
> this snapshot.
> =09
> 	#> btrfs subvolume delete my_snapshot
> 	Delete subvolume (no-commit): 'my_snapshot'
> 	ERROR: cannot delete 'my_snapshot': Operation not permitted
> 	#> chattr -i my_snapshot=20
> 	chattr: Read-only file system while setting flags on my_snapshot
> 	#> btrfs --version
> 	btrfs-progs v4.4.1
> 	#> uname -r
> 	4.5.2
>=20
> Is there any other way to do this? Or is it a bug?


You could try doing:

  btrfs property set my_snapshot ro false

normally this should change it to a read-write snapshot. But it seems like
changing btrfs properties is also blocked by chattr +i (at least I can't
change compression methods on a +i file).

--=20
With respect,
Roman

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