tests/shared/002

#! /bin/bash
# FS QA Test No. 002
#
# Test that after syncing the filesystem, adding many xattrs to a file, syncing
# the filesystem again, writing to the file and then doing a fsync against that
# file, all the xattrs still exists after a power failure. That is, after the
# fsync log/journal is replayed, the xattrs still exist and with the correct
# values.
#
# This test is motivated by a bug found in btrfs.
#
#-----------------------------------------------------------------------
# Copyright (C) 2015 SUSE Linux Products GmbH. All Rights Reserved.
# Author: Filipe Manana <fdmanana@suse.com>
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it would be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write the Free Software Foundation,
# Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
#-----------------------------------------------------------------------
#

seq=`basename $0`
seqres=$RESULT_DIR/$seq
echo "QA output created by $seq"

here=`pwd`
tmp=/tmp/$$
status=1	# failure is the default!

_cleanup()
{
	_cleanup_flakey
	rm -f $tmp.*
}
trap "_cleanup; exit \$status" 0 1 2 3 15

# get standard environment, filters and checks
. ./common/rc
. ./common/filter
. ./common/dmflakey
. ./common/attr

# real QA test starts here

# We create a lot of xattrs for a single file. Only btrfs and xfs are currently
# able to store such a large mount of xattrs per file, other filesystems such
# as ext3/4 and f2fs for example, fail with ENOSPC even if we attempt to add
# less than 1000 xattrs with very small values.
_supported_fs btrfs xfs
_supported_os Linux
_require_scratch
_require_dm_target flakey
_require_attrs

rm -f $seqres.full

_scratch_mkfs >> $seqres.full 2>&1
_require_metadata_journaling $SCRATCH_DEV
_init_flakey
_mount_flakey

# Create the test file with some initial data and make sure everything is
# durably persisted.
$XFS_IO_PROG -f -c "pwrite -S 0xaa 0 32k" $SCRATCH_MNT/foo | _filter_xfs_io
sync

# Add many small xattrs to our file.
# We create such a large amount because it's needed to trigger the issue found
# in btrfs - we need to have an amount that causes the fs to have at least 3
# btree leafs with xattrs stored in them, and it must work on any leaf size
# (maximum leaf/node size is 64Kb).
num_xattrs=2000
for ((i = 1; i <= $num_xattrs; i++)); do
	name="user.attr_$(printf "%04d" $i)"
	$SETFATTR_PROG -n $name -v "val_$(printf "%04d" $i)" $SCRATCH_MNT/foo
done

# Sync the filesystem to force a commit of the current btrfs transaction, this
# is a necessary condition to trigger the bug on btrfs.
sync

# Now update our file's data and fsync the file.
# After a successful fsync, if the fsync log/journal is replayed we expect to
# see all the xattrs we added before with the same values (and the updated file
# data of course). Btrfs used to delete some of these xattrs when it replayed
# its fsync log/journal.
$XFS_IO_PROG -c "pwrite -S 0xbb 8K 16K" \
		-c "fsync" \
		$SCRATCH_MNT/foo | _filter_xfs_io

_flakey_drop_and_remount

echo "File content after crash and log replay:"
od -t x1 $SCRATCH_MNT/foo

echo "File xattrs after crash and log replay:"
for ((i = 1; i <= $num_xattrs; i++)); do
	name="user.attr_$(printf "%04d" $i)"
	echo -n "$name="
	$GETFATTR_PROG --absolute-names -n $name --only-values $SCRATCH_MNT/foo
	echo
done

status=0
exit