Resize ext4 partition on CentOS 5

When trying to resize an ext4 partition on CentOS 5, I got an error:

$ resize2fs /dev/sdf
resize2fs 1.39 (29-May-2006)
resize2fs: Filesystem has unsupported feature(s) while trying to open /dev/sdf
Couldn't find valid filesystem superblock.

Google around and found out we must use resize4fs instead

$ resize4fs /dev/sdf
resize4fs 1.41.12 (17-May-2010)
Filesystem at /dev/sdf is mounted on /opt; on-line resizing required
old desc_blocks = 5, new_desc_blocks = 7
Performing an on-line resize of /dev/sdf to 26214400 (4k) blocks.

Similarly, we will use fsck.ext4, tune4fs for ext4