resize2fs – ext2/ext3/ext4 file system resizer
The resize2fs program will resize ext2, ext3, or ext4 file systems. It can be used to enlarge or shrink an unmounted file system located on device. If the filesystem is mounted, it can be used to expand the size of the mounted filesystem
resize2fs 1.42.9 (4-Feb-2014) Filesystem at /dev/vg/lv_home is mounted on /home; on-line resizing required old_desc_blocks = 18, new_desc_blocks = 77 The filesystem on /dev/vg/lv_home is now 319283200 blocks long.