f2fs-minimized.sh

# !/bin/sh
set -e

MNT=/mnt/f2fs-minimized-test-mnt
DISK=/tmp/f2fs-minimized-test-disk
SRC_FILE=/tmp/f2fs-minimized-test-seq
DST_FILE=$MNT/$(basename $SRC_FILE)

# Clean up
rm -f $DISK $SRC_FILE 
umount $MNT ||:
mkdir -p $MNT

# Write source file - If the file is 1 byte smaller the error doesn't happen
seq 1200000 | head -c 7700481 > $SRC_FILE
SRC_FILE_SHA1=$(sha1sum $SRC_FILE | awk {'print $1'})

# Check that the source file matches our expected sha1sum so we know that
# we are testing the same thing
if [ "$SRC_FILE_SHA1" != "4424a58b862c0bdc1001c0193c91e99156faeac4" ]; then
    echo "UNEXPECTED: $SRC_FILE does not have the correct sha1sum... WAT?"
    exit 1
fi

# Create the filesystem & mount it
dd if=/dev/zero of=$DISK bs=4096 seek=1048575 count=1
mkfs.f2fs -O compression,extra_attr $DISK
mount -t f2fs $DISK $MNT

# Copy our source file
cp $SRC_FILE $DST_FILE
# chattr +c - without this line the error doesn't happen
chattr +c $DST_FILE

# Unmount & remount the filesystem - without this the error doesn't happen
umount $MNT
mount -t f2fs $DISK $MNT

# Cheeck that the first 7700480 match, and only the last byte differs - it is zero
# in the $DST_FILE
if [ "$(head -c 7700480 $SRC_FILE | sha1sum)" != "$(head -c 7700480  $DST_FILE | sha1sum)" ]; then
    echo "UNEXPECTED: The first 7700480 bytes of the file should match"
    exit 1
fi

# Check that the $SRC_FILE does not match the $DST_FILE
DST_FILE_SHA1=$(sha1sum $DST_FILE | awk {'print $1'})
if [ "$SRC_FILE_SHA1" != "$DST_FILE_SHA1" ]; then
    echo "EXPECTED: FAILURE!"
    sha1sum $SRC_FILE $DST_FILE
else
    echo "UNEXPECTED: SUCCESS"
    exit 1
fi

# Cleanup
rm -f $DISK $SRC_FILE 
umount $MNT ||:
rmdir $MNT