btrfs-progs/tests/mkfs-tests/018-multidevice-overflow/test.sh

#!/bin/bash
# test if mkfs.btrfs will create file systems that overflow total_bytes

source "$TEST_TOP/common"

check_prereq mkfs.btrfs
check_prereq btrfs

setup_root_helper
prepare_test_dev

# create a temporary btrfs filesystem for the images to make sure the
# exabyte-scale files will be reliably created
run_check_mkfs_test_dev
run_check_mount_test_dev

# truncate can fail with EFBIG if the OS cannot create a 6EiB file
out=$(run_mayfail_stdout $SUDO_HELPER truncate -s 6E "$TEST_MNT/img1" 2>&1)
ret=$?

if [ $ret -ne 0 ]; then
	run_check_umount_test_dev
	if [[ "$out" == *"File too large"* ]]; then
		_not_run "current kernel could not create a 6EiB file"
	fi
	_fail "command 'truncate -s 6E' failed: $out"
fi

run_check $SUDO_HELPER truncate -s 6E "$TEST_MNT/img2"
run_check $SUDO_HELPER truncate -s 6E "$TEST_MNT/img3"

run_mustfail "mkfs for too-large images" \
	$SUDO_HELPER "$TOP/mkfs.btrfs" -f "$TEST_MNT"/img[123]

run_check_umount_test_dev