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Date: Wed, 8 Jun 2016 08:37:57 +0000
From: cdlscpmv <cdlscpmv@gmail.com>
To: linux-btrfs@vger.kernel.org
Subject: Can't remove read-only snapshot with immutable flag set
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Sender: linux-btrfs-owner@vger.kernel.org
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Hi!

It happened that I set the immutable flag (via `chattr +i`) on a subvolume.
Then I made a read-only snapshot of that subvolume. Now I can't remove
this snapshot.
	
	#> btrfs subvolume delete my_snapshot
	Delete subvolume (no-commit): 'my_snapshot'
	ERROR: cannot delete 'my_snapshot': Operation not permitted
	#> chattr -i my_snapshot 
	chattr: Read-only file system while setting flags on my_snapshot
	#> btrfs --version
	btrfs-progs v4.4.1
	#> uname -r
	4.5.2

Is there any other way to do this? Or is it a bug?