Re: rollback to a snapshot and delete old top volume - missing of "@"

[Andrei Borzenkov <arvidjaar@gmail.com>]

09.07.2016 00:50, Chris Murphy пишет:
>>
>> Instead those utilities should employ rootflags=subvol or subvolid to
>> explicitly use a particular fs tree for rootfs, rather that hide this
>> fact by using subvolume set-default.
> 
> The only distro installer I know that works this way out of the box is
> Fedora/Red Hat's Anaconda. It leaves the default subvolume as 5, but
> does not install the OS there. Instead each mountpoint is created as a
> subvolume in that top level, and rootflags kernel parameter and fstab
> are used to assemble those subvolumes per the FHS virtually. It's
> completely discoverable, you can follow each step along the way, it's
> not obscured.
> 
> The additional benefit is no nested subvolumes.
> 

Does it use grub2? Where /boot/grub is located - on one of those
snapshots or on partition outside of btrfs control?

Does it support booting from previous read-only snapshot directly and/or
rollback to previous snapshot?