That's because the test shouldn't be in your root in the first place. The common way of thinking now is to create a btrfs volume with a structure for holding subvolumes inside of which your system root is a member. You then mount the system root via -o subvol= and will only see it and nothing else. If you want access to the "control" structure you mount that without -o subvol. If you want to mount another subvolume (even in place of your root) you mount that with -o subvol to whereever you want.
Examples: real btrfs root: /root/default /root/snap1 /root/snap2 /home/default /home/snap1 The system root mounts /root/default on boot via -o subvol=root/default as well as the /home/default subvolume for /home. Then if you want to make a snapshot you mount btrfs to something like /mnt/ctrl and do 'btrfs sub snap / /mnt/ctrl/root/snap3' and umount /mnt/ctrl again. Rolling back a snapshot is as easy as mounting /mnt/ctrl and doing 'mv /mnt/ctrl/root/default /mnt/ctrl/root/default-old && mv /mnt/ctrl/root/snap3 /mnt/ctrl/root/default' followed by a reboot. No changes are necessary to your boot system and on the next boot you are rolled back and can delete the default-old subvol if you desire. On Thu, Mar 14, 2013 at 5:24 AM, Queen Adam <adam900...@gmail.com> wrote: > Hi all, > > When using "btrfs sub create test" commands to create a subvolume, it > will create test directory in the current directory. > > But the subvol directory can only be delete by "btrfs sub delete" > command, which seems also delete all the data in the subvolume. > > Any method about the 'umount'-like method to 'umount' the subvolume > and delete the subvolume directory without deleting all the data? > The method now seems less flexible (can mount -o subvol=test to other > path but the test/ can't be deleted) > > Thanks. > -- > To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in > the body of a message to majord...@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
