tests/generic/745

#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2015 SUSE Linux Products GmbH. All Rights Reserved.
#
# FS QA Test No. 745
#
# 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.
#
. ./common/preamble
_begin_fstest auto metadata quick log

# Override the default cleanup function.
_cleanup()
{
	_cleanup_flakey
	rm -f $tmp.*
}

# Import common functions.
. ./common/filter
. ./common/dmflakey
. ./common/attr

_require_scratch
_require_dm_target flakey
_require_attrs

# 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.
case "$FSTYP" in
btrfs|xfs)
	;;
*)
	_notrun "Requires support for > 1000 xattrs"
	;;
esac

_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 --absolute-names -n $name --only-values $SCRATCH_MNT/foo
	echo
done

status=0
exit