How to mount a subvolume?

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First thanks alot to Kay and Goffredo!

But I have another question.

I read that the current tools cannot display subvolumes, but one should still
be able to mount them. If I try I get an error message:

> mount -t btrfs -o subvol=root.2010-01-07 /dev/sda3 /save
mount: /dev/sda3 is not a valid block device

root.2010-01-07 is a snapshot of the /root-directory

/save is an empty directory used for mounting backups

taken (successfully) with the following command:

> btrfsctl -s root.2010-01-07 /root

What am I doing wrong? Isn't it possible to mount the whole filesystem and a
subvolume at the same time?

Greetings, Michael
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