Removing snapshots

Removing snapshots

[K. Richard Pixley]

On ubuntu-10.04, the standard package for btrfs-tools is 0.19-8.  This version apparently lacks the -D option to btrfsctl.

In this configuration, how do I remove snapshots?

--rich

Re: Removing snapshots

[Aaron Straus]

On Tue, Jul 13, 2010 at 3:58 PM, K. Richard Pixley <rich@noir.com> wrot=
e:
> On ubuntu-10.04, the standard package for btrfs-tools is 0.19-8. =A0T=
his version apparently lacks the -D option to btrfsctl.
>
> In this configuration, how do I remove snapshots?

I'm not sure you can.  However the btrfs tools from this address
compile and run well on Ubuntu 10.04:

    https://btrfs.wiki.kernel.org/index.php/Btrfs_source_repositories



Cheers,
=3Da=3D



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Aaron Straus
aaron@merfinllc.com
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Re: Removing snapshots

[Arand Nash]

On Wed, Jul 14, 2010 at 1:24 AM, Aaron Straus <aaron@edgestreamlp.com> =
wrote:
> On Tue, Jul 13, 2010 at 3:58 PM, K. Richard Pixley <rich@noir.com> wr=
ote:
>> On ubuntu-10.04, the standard package for btrfs-tools is 0.19-8. =A0=
This version apparently lacks the -D option to btrfsctl.
>>
>> In this configuration, how do I remove snapshots?
>
> I'm not sure you can. =A0However the btrfs tools from this address
> compile and run well on Ubuntu 10.04:
>
> =A0 =A0https://btrfs.wiki.kernel.org/index.php/Btrfs_source_repositor=
ies

Elsewise the current btrfs-tools version in ubuntu dev version 10.10
do have this functionality. So installing that one might be another
option.

- arand
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Re: Removing snapshots

[K. Richard Pixley]

  Here's what I'm getting on ubuntu-10.04 with standard tools, 
(/sbin/btrfsctl), and freshly built tools, (/usr/local/bin/btrfsctl).

Are we sure that the btrfs kernel module in this release is supporting 
the right ioctls?

--rich

rich@diamonds> pwd
/home/rich
rich@diamonds> mount | grep /home
/dev/sda7 on /home type btrfs (rw,noatime)
rich@diamonds> /sbin/btrfsctl -s snaptest /home
operation complete
Btrfs Btrfs v0.19
rich@diamonds> ls -lasd snaptest
4 drwxr-xr-x 1 root root 52 2010-06-21 16:13 snaptest
rich@diamonds> /sbin/btrfsctl
no valid commands given
usage: btrfsctl [ -d file|dir] [ -s snap_name subvol|tree ]
                 [-r size] [-A device] [-a] [-c]
         -d filename: defragments one file
         -d directory: defragments the entire Btree
         -s snap_name dir: creates a new snapshot of dir
         -S subvol_name dir: creates a new subvolume
         -r [+-]size[gkm]: resize the FS by size amount
         -A device: scans the device file for a Btrfs filesystem
         -a: scans all devices for Btrfs filesystems
         -c: forces a single FS sync
Btrfs Btrfs v0.19
rich@diamonds> /usr/local/bin/btrfsctl
no valid commands given
usage: btrfsctl [ -d file|dir] [ -s snap_name subvol|tree ]
                 [-r size] [-A device] [-a] [-c] [-D dir .]
         -d filename: defragments one file
         -d directory: defragments the entire Btree
         -s snap_name dir: creates a new snapshot of dir
         -S subvol_name dir: creates a new subvolume
         -r [+-]size[gkm]: resize the FS by size amount
         -A device: scans the device file for a Btrfs filesystem
         -a: scans all devices for Btrfs filesystems
         -c: forces a single FS sync
         -D: delete snapshot
         -m [tree id] directory: set the default mounted subvolume to 
the [tree id] or the directory
Btrfs v0.19-16-g075587c
rich@diamonds> /usr/local/bin/btrfsctl -D snaptest
ioctl:: Operation not permitted
rich@diamonds> sudo /usr/local/bin/btrfsctl -D snaptest
ioctl:: No such file or directory
rich@diamonds> sudo /usr/local/bin/btrfsctl -D snaptest /home
ioctl:: No such file or directory
rich@diamonds> sudo /usr/local/bin/btrfsctl -D /home snaptest
ioctl:: Invalid argument

Re: Removing snapshots

[Aaron Straus]

On Wed, Jul 14, 2010 at 12:15 PM, K. Richard Pixley <rich@noir.com> wro=
te:
> =A0Here's what I'm getting on ubuntu-10.04 with standard tools,
> (/sbin/btrfsctl), and freshly built tools, (/usr/local/bin/btrfsctl).
>
> Are we sure that the btrfs kernel module in this release is supportin=
g the
> right ioctls?

Yes it works for me, see the correct arguments below.

> rich@diamonds> sudo /usr/local/bin/btrfsctl -D snaptest /home
> ioctl:: No such file or directory

The snaptest snapshot is in your home directory (I think), not in
/home, so you need to specify the full path i.e.:

sudo /usr/local/bin/btrfsctl -D snaptest /home/rich


Cheers,
=3Da=3D


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Aaron Straus
aaron@merfinllc.com
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