Can't remove read-only snapshot with immutable flag set

Can't remove read-only snapshot with immutable flag set

[cdlscpmv]

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?

Re: Can't remove read-only snapshot with immutable flag set

[Roman Mamedov]

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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 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?


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).

-- 
With respect,
Roman

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Re: Can't remove read-only snapshot with immutable flag set

[Noah Massey]

On Wednesday, June 8, 2016, cdlscpmv <cdlscpmv@gmail.com> wrote:
>
> 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?
>
Try
#> btrfs property set my_snaphot ro false
#> chattr -i my_snapshot
#> btrfs sub del my_snapshot

Re: Can't remove read-only snapshot with immutable flag set

[cdlscpmv]

On 2016/06/08 06:47:52 -0400, Noah Massey wrote:
> On Wednesday, June 8, 2016, cdlscpmv <cdlscpmv@gmail.com> wrote:
> >
> > 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?
> >
> Try
> #> btrfs property set my_snaphot ro false
> #> chattr -i my_snapshot
> #> btrfs sub del my_snapshot

I've already tried that. It worked. Nevertheless, thanks for the reply!