f2fs-benchmark.sh

# !/bin/sh
set -e

# Data from http://sun.aei.polsl.pl/~sdeor/index.php?page=silesia
# But, I don't think the actual data matters for the errors. Maybe
# the size does?
BENCHMARK_DIR=/tmp/silesia
N=1


# Create the F2FS filesystem
rm -f /tmp/disk
losetup -D
umount /mnt/test ||:
dd if=/dev/zero of=/tmp/disk bs=4096 seek=1048575 count=1
mkfs.f2fs -O compression,extra_attr /tmp/disk
losetup -f /tmp/disk
sleep 1 # yay udev races
# Mount the filesystem
mount -t f2fs -ocompress_algorithm=$1 /dev/loop0 /mnt/test

echo "Benchmarking $1"
# Run the benchmark
echo "Compression"
time sh -c "set -e; for i in \$(seq $N); do cp -r $BENCHMARK_DIR /mnt/test/\$i; find /mnt/test/\$i -type f | xargs -I__ sh -c 'chattr +c __; touch __'; done; sync;"

# Unmount and remount to avoid any caching
umount /mnt/test
losetup -D
losetup -f /tmp/disk
mount -t f2fs -ocompress_algorithm=$1 /dev/loop0 /mnt/test

echo "Approximate compression ratio"
printf "%d / %d\n"                                                             \
  $(df /mnt/test --output=used -B 1 | tail -n 1)                               \
  $(du /mnt/test -b -d 0 | tr '\t' '\n' | head -n 1);

# Unmount and remount to avoid any caching
umount /mnt/test
losetup -D
losetup -f /tmp/disk
mount -t f2fs -ocompress_algorithm=$1 /dev/loop0 /mnt/test

echo "Decompression"
time find /mnt/test -type f | xargs cat > /dev/null

# This is where the error happens
# I get checksum errors
for i in $(seq $N); do
	for file in $(ls -1 $BENCHMARK_DIR); do
 		asha=$(sha1sum $BENCHMARK_DIR/$file)
 		bsha=$(sha1sum /mnt/test/$i/$file)
 		if [ "$asha" != "$bsha" ]; then
 			echo "FAILURE $file"
 			sha1sum $BENCHMARK_DIR/$file /mnt/test/$i/$file
 			exit 1
 		fi
 	done
done

# Cleanup
losetup -D
umount /mnt/test
rm -f /tmp/disk