Resizing LVM partitions

[skoric@uns.ac.rs]

I am getting the following message at any boot:

"The volume "Filesystem root" has only 221.1 MB disk space remaining."

 df -h says:

Filesystem                  Size  Used Avail Use% Mounted on
udev                        1.5G     0  1.5G   0% /dev
tmpfs                       297M  9.0M  288M   4% /run
/dev/mapper/localhost-root  5.2G  4.7G  211M  96% /
/dev/mapper/localhost-usr    14G   12G  948M  93% /usr
tmpfs                       1.5G     0  1.5G   0% /dev/shm
tmpfs                       5.0M  4.0K  5.0M   1% /run/lock
tmpfs                       1.5G     0  1.5G   0% /sys/fs/cgroup
/dev/sda1                   228M  133M   84M  62% /boot
/dev/mapper/localhost-tmp   2.3G   57K  2.2G   1% /tmp
/dev/mapper/localhost-var   2.7G  2.5G   55M  98% /var
/dev/mapper/localhost-home  257G   73G  172G  30% /home
tmpfs                       297M   40K  297M   1% /run/user/1000

As my system has encrypted LVM, I suppose that I shall reduce some space
used for /home, and then use it to extend /, /usr, and /var logical
partitions. I think I did (or tried to do) something similar several years
ago, but forgot the proper procedure. Any link for a good tutorial is
welcomed. Thanks.

Misko