This ioctl will be responsible for deleting a subvolume using its id.
This can be used when a system has a file system mounted from a
subvolume, rather than the root file system, like below:
/
@subvol1/
@subvol2/
@subvol_default/
If only @subvol_default is mounted, we have no path to reach @subvol1
(id 256) and @subvol2 (id 257), thus no way to delete them. Current
subvolume delete ioctl takes a file handle point as argument, and if
@subvol_default is mounted, we can't reach @subvol1 and @subvol2 from
the same mount point.
$ mount -o subvol=subvol_default /mnt
$ btrfs subvolume delete -i 257 /mnt
This will delete @subvol2 although it's path is hidden.
Fixes: #152
Signed-off-by: Marcos Paulo de Souza <mpdesouza@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
6e85994e80