How to resize LVM logical volumes with ext4 as filesystem

Ever been in the situation where you needed to save some important files to a server and your greeted with “Not enough space left on device”-kind messages? No? Well, as that happened too often too me for my liking, I decided to do it right this time when I set up my home server and use logical volume manager (LVM) straight from the start. So basically, all I had to do was to shrink a filesystem that had free space in it and its partition (logical volume (LV) to be precisely) afterwards and then to resize the logical volume/filesystem where I needed the space.
As all the necessary tools are available normally on a system with LVM support, I could dive right in:

 
# Unmount the filesystem and check its' LV
umount /mnt/foo
e2fsck -f /dev/mapper/vg0-foo
 
# Shrink ext4 and then the LV to the desired size
resize2fs -p /dev/mapper/vg0-foo 40G
lvreduce -L 40G /dev/mapper/vg0-foo
 
# Before continuing, run e2fsck. If it bails because the partition
# is too small, don't panic! The LV can still be extended with
# lvextend until e2fsck succeeds, e.g.:
# lvextend -L +1G /dev/mapper/vg0-foo
 
e2fsck -f /dev/mapper/vg0-foo
 
# Resize the filesystem to match the LVs size, check and mount it
 
resize2fs -p /dev/mapper/vg0-foo
e2fsck -f /dev/mapper/vg0-foo
mount /mnt/foo
 
That was the tricky part. The rest is pretty straight forward:
  • unmount the filesystem,
  • extend the logical volume and
  • expand the filesystem afterwards.

umount /mnt/bar
 
# Extend the LV to use all free space
lvextend -l +100%FREE /dev/mapper/vg0-bar
e2fsck -f /dev/mapper/vg0-bar
 
# Resize the partition to fill the LV
resize2fs -p /dev/mapper/vg0-bar
e2fsck -f /dev/mapper/vg0-bar
mount /mnt/bar

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