I resized an EXT4 partition with resize2fs, but it was after the action completed that I found out it only shrinked the filesystem, not the partition. How can I grow the filesystem to be the size of the partition again? (My question isn't about shrinking the partition,  I did that with GParted. My question is about how to grow the filesystem back to the size of the now smaller partition.) GParted says I have 11.56 gigabytes used (the size of all my files added together is 4.4 gigs), while df says 4.4 gigs.Output of df -h:Filesystem      Size  Used Avail Use%/dev/sda4       443G  4.4G  439G   1%Output of fsck /dev/sda:Device          Start        End   Sectors   Size Type/dev/sda4   975955968 1918963711 943007744 449.7G Linux filesystem
Get back free space lost with resize2fs
filesystems;partition
The default action of resize2fs is to grow the filesystem to occupy the whole partition, so you just need to run resize2fs /dev/sda4.Indeed, this is what I think most people do to shrink a filesystem:shrink the FS to some size that lies between the minimum size (defined by the volume of files already in the filesystem) and the desired sizeresize the partition to the desired sizeresize the FS to fit the partitionMaybe nowadays partitioning tools check the size of the FS so that it doesn't get truncated when shrinking the partition too much, but it's not something one wants to check too often!