#!/bin/bash
# create a base image, convert to btrfs, remove all files, rollback the ext4 image
# note: ext4 only

source "$TEST_TOP/common" || exit
source "$TEST_TOP/common.convert" || exit

check_prereq btrfs-convert
check_global_prereq mke2fs

setup_root_helper
prepare_test_dev
check_kernel_support_acl

# simple wrapper for a convert test
# $1: btrfs features, argument to -O
# $2: message
# $3: nodesize value
# $4 + rest: command to create the ext2 image
do_test() {
	local features
	local msg
	local nodesize
	local CHECKSUMTMP
	local here

	features="$1"
	msg="$2"
	nodesize="$3"
	shift 3
	convert_test_preamble "$features" "$msg" "$nodesize" "$@"
	convert_test_prep_fs ext4 "$@"
	populate_fs
	CHECKSUMTMP=$(_mktemp convert)
	convert_test_gen_checksums "$CHECKSUMTMP"

	run_check_umount_test_dev

	convert_test_do_convert "$features" "$nodesize"

	if ! convert_can_mount "$features"; then
		return 0
	fi

	run_check_mount_test_dev
	convert_test_post_check_checksums "$CHECKSUMTMP"

	here=$(pwd)
	cd "$TEST_MNT" || _fail "cannot cd to TEST_MNT"
	# ext2_saved/image must not be deleted
	run_mayfail $SUDO_HELPER find "$TEST_MNT"/ -mindepth 1 -path '*ext2_saved' -prune -o -exec rm -vrf "{}" \;
	cd "$here"
	run_check "$TOP/btrfs" filesystem sync "$TEST_MNT"
	run_check_umount_test_dev
	convert_test_post_rollback ext4

	run_check_mount_convert_dev ext4
	convert_test_post_check_checksums "$CHECKSUMTMP"
	run_check_umount_test_dev

	# mount again and verify checksums
	run_check_mount_convert_dev ext4
	convert_test_post_check_checksums "$CHECKSUMTMP"
	run_check_umount_test_dev

	rm -- "$CHECKSUMTMP"
}

# Iterate over defaults and options that are not tied to hardware capabilities
# or number of devices
for feature in '' 'block-group-tree'; do
	do_test "$feature" "ext4 4k nodesize" 4096 mke2fs -t ext4 -b 4096
	do_test "$feature" "ext4 16k nodesize" 16384 mke2fs -t ext4 -b 4096
	do_test "$feature" "ext4 64k nodesize" 65536 mke2fs -t ext4 -b 4096
done