timofey@Beplan:~$ sudo dd if=/dev/zero of=/home/timofey/btrfs bs=256M count=4
4+0 records in
4+0 records out
1073741824 bytes (1.1 GB) copied, 0.934593 s, 1.1 GB/s
timofey@Beplan:~$ sudo mkfs.btrfs ~/btrfs
WARNING! - Btrfs v0.20-rc1 IS EXPERIMENTAL
WARNING! - see
http://btrfs.wiki.kernel.org before using
fs created label (null) on /home/timofey/btrfs
nodesize 4096 leafsize 4096 sectorsize 4096 size 1.00GB
Btrfs v0.20-rc1
timofey@Beplan:~$ sudo mount ~/btrfs /mnt
timofey@Beplan:~$ mkdir /tmp/1
timofey@Beplan:~$ sudo mount /dev/sda3 /tmp/1
timofey@Beplan:~$ cp /tmp/1/raring-desktop-amd64.iso /mnt/
timofey@Beplan:~$ df -h /mnt
Filesystem Size Used Avail Use% Mounted on
/dev/loop0 1.0G 1.8M 894M 1% /mnt
timofey@Beplan:~$ btrfs fi df /mntData: total=893.62MB, used=0.00
System, DUP: total=8.00MB, used=4.00KB
System: total=4.00MB, used=0.00
Metadata, DUP: total=51.19MB, used=880.00KB
Metadata: total=8.00MB, used=0.00