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How to Increase Loopback Filesystem Size

check current image size
$ du -m /path/to/loopback-fs.data
100000 /path/to/loopback-fs.data
add 50 GB
$ dd if=/dev/zero of=/path/to/loopback-fs.data bs=1M seek=100000 count=50000 conv=sparse
fsck to make sure it's clean
$ e2fsck -f /path/to/loopback-fs.data
resize $ resize2fs /path/to/loopback-fs.data

(adapted from https://www.brain-dump.org/blog/resizing-loop-back-file-systems/)