LVM调整/ home和/

这是我的分区：

[awake@desktop ~]$ sudo df -h Filesystem Size Used Avail Use% Mounted on rootfs 36G 2.5G 33G 8% / udev 495M 0 495M 0% /dev tmpfs 502M 260K 502M 1% /dev/shm tmpfs 502M 748K 501M 1% /run /dev/mapper/vg_desktop-lv_root 36G 2.5G 33G 8% / tmpfs 502M 0 502M 0% /sys/fs/cgroup tmpfs 502M 0 502M 0% /media /dev/sda1 485M 50M 410M 11% /boot /dev/mapper/vg_desktop-lv_home 36G 20G 15G 59% /home /dev/mapper/vg_desktop-lv_root 36G 2.5G 33G 8% /tmp /dev/mapper/vg_desktop-lv_root 36G 2.5G 33G 8% /var/tmp /dev/mapper/vg_desktop-lv_home 36G 20G 15G 59% /home /dev/sdb5 932G 637G 295G 69% /media/Новый том 

所以我没有任何空间。 如何将一部分/分区大小发送到encryptionlvm中的/ home，而不会丢失数据？