+
+prepare_test_dev()
+{
+ # num[K/M/G/T...]
+ local size="$1"
+
+ [[ "$size" ]] || size='2G'
+ # Still truncate it to new size
+ if [ -n "$TEST_DEV" ]; then
+ truncate -s 0 "$TEST_DEV"
+ truncate -s "$size" "$TEST_DEV"
+ return;
+ fi
+
+ echo "\$TEST_DEV not given, using $TEST_TOP/test.img as fallback" >> \
+ "$RESULTS"
+ TEST_DEV="$TEST_TOP/test.img"
+
+ truncate -s 0 "$TEST_DEV"
+ truncate -s "$size" "$TEST_DEV" || _not_run "create file for loop device failed"
+}
+
+run_check_mount_test_dev()
+{
+ setup_root_helper
+
+ local loop_opt
+ if [[ -b "$TEST_DEV" ]]; then
+ loop_opt=""
+ elif [[ -f "$TEST_DEV" ]]; then
+ loop_opt="-o loop"
+ else
+ _fail "Invalid \$TEST_DEV: $TEST_DEV"
+ fi
+
+ [[ -d "$TEST_MNT" ]] || {
+ _fail "Invalid \$TEST_MNT: $TEST_MNT"
+ }
+
+ run_check $SUDO_HELPER mount -t btrfs $loop_opt "$@" "$TEST_DEV" "$TEST_MNT"
+}
+
+# $1-$n: optional paths to unmount, otherwise fallback to TEST_DEV
+run_check_umount_test_dev()
+{
+ setup_root_helper
+ if [ "$#" = 0 ]; then
+ set -- "$TEST_DEV"
+ fi
+ run_check $SUDO_HELPER umount "$@"
+}
+
+check_kernel_support()
+{
+ if ! grep -iq 'btrfs' /proc/filesystems; then
+ run_check $SUDO_HELPER modprobe btrfs
+ if ! grep -iq 'btrfs' /proc/filesystems; then
+ echo \
+"WARNING: btrfs filesystem not found in /proc/filesystems, some tests might fail"
+ return 1
+ fi
+ fi
+ return 0
+}
+
+# how many files to create.
+DATASET_SIZE=50
+
+generate_dataset() {
+
+ dataset_type="$1"
+ dirpath=$TEST_MNT/$dataset_type
+ run_check $SUDO_HELPER mkdir -p "$dirpath"
+
+ case "$dataset_type" in
+ small)
+ for num in $(seq 1 "$DATASET_SIZE"); do
+ run_check $SUDO_HELPER dd if=/dev/urandom of="$dirpath/$dataset_type.$num" bs=10K \
+ count=1 >/dev/null 2>&1
+ done
+ ;;
+
+ hardlink)
+ for num in $(seq 1 "$DATASET_SIZE"); do
+ run_check $SUDO_HELPER touch "$dirpath/$dataset_type.$num"
+ run_check $SUDO_HELPER ln "$dirpath/$dataset_type.$num" "$dirpath/hlink.$num"
+ done
+ ;;
+
+ fast_symlink)
+ for num in $(seq 1 "$DATASET_SIZE"); do
+ run_check $SUDO_HELPER touch "$dirpath/$dataset_type.$num"
+ run_check cd "$dirpath" && \
+ $SUDO_HELPER ln -s "$dataset_type.$num" "$dirpath/slink.$num" && \
+ cd /
+ done
+ ;;
+
+ brokenlink)
+ for num in $(seq 1 "$DATASET_SIZE"); do
+ run_check $SUDO_HELPER ln -s "$dirpath/$dataset_type.$num" "$dirpath/blink.$num"
+ done
+ ;;
+
+ perm)
+ for modes in 777 775 755 750 700 666 664 644 640 600 444 440 400 000 \
+ 1777 1775 1755 1750 1700 1666 1664 1644 1640 1600 1444 1440 1400 1000 \
+ 2777 2775 2755 2750 2700 2666 2664 2644 2640 2600 2444 2440 2400 2000 \
+ 4777 4775 4755 4750 4700 4666 4664 4644 4640 4600 4444 4440 4400 4000; do
+ run_check $SUDO_HELPER touch "$dirpath/$dataset_type.$modes"
+ run_check $SUDO_HELPER chmod "$modes" "$dirpath/$dataset_type.$modes"
+ done
+ ;;
+
+ sparse)
+ for num in $(seq 1 "$DATASET_SIZE"); do
+ run_check $SUDO_HELPER dd if=/dev/urandom of="$dirpath/$dataset_type.$num" bs=10K \
+ count=1 >/dev/null 2>&1
+ run_check $SUDO_HELPER truncate -s 500K "$dirpath/$dataset_type.$num"
+ run_check $SUDO_HELPER dd if=/dev/urandom of="$dirpath/$dataset_type.$num" bs=10K \
+ oflag=append conv=notrunc count=1 >/dev/null 2>&1
+ run_check $SUDO_HELPER truncate -s 800K "$dirpath/$dataset_type.$num"
+ done
+ ;;
+
+ acls)
+ for num in $(seq 1 "$DATASET_SIZE"); do
+ run_check $SUDO_HELPER touch "$dirpath/$dataset_type.$num"
+ run_check $SUDO_HELPER setfacl -m "u:root:x" "$dirpath/$dataset_type.$num"
+ run_check $SUDO_HELPER setfattr -n user.foo -v "bar$num" "$dirpath/$dataset_type.$num"
+ done
+ ;;
+
+ fifo)
+ for num in $(seq 1 "$DATASET_SIZE"); do
+ run_check $SUDO_HELPER mkfifo "$dirpath/$dataset_type.$num"
+ done
+ ;;
+
+ slow_symlink)
+ long_filename=`date +%s | sha256sum | cut -f1 -d ' '`
+ run_check $SUDO_HELPER touch "$dirpath/$long_filename"
+ for num in $(seq 1 "$DATASET_SIZE"); do
+ run_check $SUDO_HELPER ln -s "$dirpath/$long_filename" "$dirpath/slow_slink.$num"
+ done
+ ;;
+ large)
+ run_check $SUDO_HELPER dd if=/dev/urandom bs=32M count=1 \
+ of="$dirpath/$dataset_type" >/dev/null 2>&1
+ ;;
+ esac
+}
+
+# prepare environment for loop devices, set up the following variables
+# - nloopdevs -- number of desired devices
+# - loopdevs -- array containing paths to all devices (after prepare is called)
+# - loopdev_prefix -- file backed images starting with this string, 'img' by default
+#
+# $1: number of loop devices to be set up
+setup_loopdevs()
+{
+ if [ -z "$1" ]; then
+ _fail "setup_loopdevs needs a number"
+ fi
+ nloopdevs="$1"
+ loopdev_prefix=img
+ declare -a loopdevs
+
+}
+
+# create all loop devices from a given loopdev environment
+prepare_loopdevs()
+{
+ for i in `seq $nloopdevs`; do
+ touch $loopdev_prefix$i
+ chmod a+rw $loopdev_prefix$i
+ truncate -s0 $loopdev_prefix$i
+ truncate -s2g $loopdev_prefix$i
+ loopdevs[$i]=`run_check_stdout $SUDO_HELPER losetup --find --show $loopdev_prefix$i`
+ done
+}
+
+# detach loop devices and reset their size to 0, delete the files afterwards
+cleanup_loopdevs()
+{
+ for dev in ${loopdevs[@]}; do
+ run_check $SUDO_HELPER losetup -d $dev
+ done
+ for i in `seq $nloopdevs`; do
+ truncate -s0 $loopdev_prefix$i
+ rm -- "$loopdev_prefix$i"
+ done
+ run_check $SUDO_HELPER losetup --all
+}
+
+init_env()
+{
+ TEST_MNT="${TEST_MNT:-$TEST_TOP/mnt}"
+ export TEST_MNT
+ mkdir -p "$TEST_MNT" || { echo "Failed mkdir -p $TEST_MNT"; exit 1; }
+
+ source $TEST_TOP/common.local
+
+ if [ "$TEST_ENABLE_OVERRIDE" = 'true' -a -n "$RESULTS" ]; then
+ echo "INCLUDE common.local" >> "$RESULTS"
+ echo " check: $TEST_ARGS_CHECK" >> "$RESULTS"
+ fi
+}
+init_env