anon@jolly:~$ sudo resize2fs -p /dev/sdb2
resize2fs 1.42.12 (29-Aug-2014)
Resizing the filesystem on /dev/sdb2 to 7899648 (4k) blocks.
The filesystem on /dev/sdb2 is now 7899648 (4k) blocks long.

anon@jolly:~$