tests/btrfs/012

#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2013 Red Hat, Inc.  All Rights Reserved.
#
# FS QA Test No. 012
#
# Test btrfs-convert
#
# 1) create ext4 filesystem & populate it
# 2) convert it to btrfs, mount it, verify contents
# 3) verify archived ext4 image integriy & contents
# 4) populate btrfs fs with new data
# 5) roll back conversion to original ext4
# 6) verify rolled-back fs integrity & contents
#
. ./common/preamble
_begin_fstest auto convert

. ./common/filter.btrfs

_require_scratch_nocheck

_require_command "$BTRFS_CONVERT_PROG" btrfs-convert
_require_command "$MKFS_EXT4_PROG" mkfs.ext4
_require_command "$E2FSCK_PROG" e2fsck
_require_fssum
# ext4 does not support zoned block device
_require_non_zoned_device "${SCRATCH_DEV}"
_require_loop
_require_extra_fs ext4

BASENAME="stressdir"
BLOCK_SIZE=`_get_block_size $TEST_DIR`

# Override the SELinux mount options, or it will lead to unexpected
# different security.selinux between the original and converted fs,
# causing false metadata mismatch during fssum.
export SELINUX_MOUNT_OPTIONS=""

# Create & populate an ext4 filesystem
$MKFS_EXT4_PROG -F -b $BLOCK_SIZE $SCRATCH_DEV > $seqres.full 2>&1 || \
	_notrun "Could not create ext4 filesystem"
# Manual mount so we don't use -t btrfs or selinux context
mount -t ext4 $SCRATCH_DEV $SCRATCH_MNT

echo "populating the initial ext fs:" >> $seqres.full
mkdir "$SCRATCH_MNT/$BASENAME"
$FSSTRESS_PROG -w -d "$SCRATCH_MNT/$BASENAME" -n 20 -p 500 >> $seqres.full

# Create the checksum to verify later.
$FSSUM_PROG -A -f -w $tmp.original "$SCRATCH_MNT/$BASENAME"
_scratch_unmount

# Convert it to btrfs, mount it, verify the data
$BTRFS_CONVERT_PROG $SCRATCH_DEV >> $seqres.full 2>&1 || \
	_fail "btrfs-convert failed"
_try_scratch_mount || _fail "Could not mount new btrfs fs"

echo "Checking converted btrfs against the original one:"
$FSSUM_PROG -r $tmp.original $SCRATCH_MNT/$BASENAME

# Old ext4 image file should exist & be consistent
$E2FSCK_PROG -fn $SCRATCH_MNT/ext2_saved/image >> $seqres.full 2>&1 || \
	_fail "archived ext4 image is corrupt"

# And the files in that image should match
mkdir -p $SCRATCH_MNT/mnt
mount -o loop $SCRATCH_MNT/ext2_saved/image $SCRATCH_MNT/mnt || \
	_fail "could not loop mount saved ext4 image"

echo "Checking saved ext2 image against the original one:"
$FSSUM_PROG -r $tmp.original $SCRATCH_MNT/mnt/$BASENAME
umount $SCRATCH_MNT/mnt

echo "Generating new data on the converted btrfs" >> $seqres.full
mkdir -p $SCRATCH_MNT/new 
$FSSTRESS_PROG -w -d "$SCRATCH_MNT/new" -n 20 -p 500 >> $seqres.full

_scratch_unmount

# Now restore the ext4 device
$BTRFS_CONVERT_PROG -r $SCRATCH_DEV >> $seqres.full 2>&1 || \
	_fail "btrfs-convert rollback failed"

# Check it again
$E2FSCK_PROG -fn $SCRATCH_DEV >> $seqres.full 2>&1 || \
        _fail "restored ext4 image is corrupt"

# Mount the un-converted ext4 device & check the contents
mount -t ext4 $SCRATCH_DEV $SCRATCH_MNT
echo "Checking rolled back ext2 against the original one:"
$FSSUM_PROG -r $tmp.original $SCRATCH_MNT/$BASENAME

_scratch_unmount

# Convert it to btrfs, mount it and delete "ext2_saved"
$BTRFS_CONVERT_PROG $SCRATCH_DEV >> $seqres.full 2>&1 || \
	_fail "btrfs-convert failed"
_try_scratch_mount || _fail "Could not mount new btrfs fs"
$BTRFS_UTIL_PROG subvolume delete $SCRATCH_MNT/ext2_saved >> $seqres.full 2>&1 ||
	_fail "failed to delete ext2_saved subvolume"
_scratch_unmount

# Now restore the ext4 device, expecting a failure
$BTRFS_CONVERT_PROG -r $SCRATCH_DEV >> $seqres.full 2>&1
[ $? -eq 1 ] || _fail "Failure is expected, but btrfs-convert returns with rollback complete"

# success, all done
status=0
exit