generic: test i_flags recovery after power failure

After fsync, filesystem should guarantee inode metadata including
i_flags being persisted, so even after sudden power-cut, during
mount, we should recover i_flags fields correctly, in order to not
loss those meta info.

So adding this testcase to check whether generic filesystem can
guarantee that.

We only check below attribute modification which most filesystem
supports:
- no atime updates (A)
- secure deletion (s)
- synchronous updates (S)
- undeletable (u)

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Reviewed-by: Eryu Guan <guaneryu@gmail.com>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>

tests/generic/507

@@ -0,0 +1,133 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2018 Huawei.  All Rights Reserved.
+#
+# FS QA Test 507
+#
+# This testcase is trying to test recovery flow of generic filesystem, w/ below
+# steps, once i_flags changes, after we fsync that file, we can expect that
+# i_flags can be recovered after sudden power-cuts.
+# 1. touch testfile;
+# 1.1 sync (optional)
+# 2. chattr +[AsSu] testfile
+# 3. xfs_io -f testfile -c "fsync";
+# 4. godown;
+# 5. umount;
+# 6. mount;
+# 7. check i_flags
+# 8. chattr -[AsSu] testfile
+# 9. xfs_io -f testfile -c "fsync";
+# 10. godown;
+# 11. umount;
+# 12. mount;
+# 13. check i_flags
+#
+seq=`basename $0`
+seqres=$RESULT_DIR/$seq
+echo "QA output created by $seq"
+
+here=`pwd`
+tmp=/tmp/$$
+status=1	# failure is the default!
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+_cleanup()
+{
+	cd /
+	rm -f $tmp.*
+}
+
+# get standard environment, filters and checks
+. ./common/rc
+. ./common/filter
+
+# remove previous $seqres.full before test
+rm -f $seqres.full
+
+# real QA test starts here
+_supported_fs generic
+_supported_os Linux
+
+_require_command "$LSATTR_PROG" lasttr
+_require_command "$CHATTR_PROG" chattr
+_require_chattr AsSu
+
+_require_scratch
+_require_scratch_shutdown
+
+_scratch_mkfs >/dev/null 2>&1
+_require_metadata_journaling $SCRATCH_DEV
+
+testfile=$SCRATCH_MNT/testfile
+
+do_check()
+{
+	attr=$1
+
+	_scratch_mount
+
+	touch $testfile
+
+	if [ "$2" == "sync" ]; then
+		echo "sync" >> $seqres.full
+		sync
+	fi
+
+	echo "Test chattr +$1" >> $seqres.full
+
+	# add attribute
+	$CHATTR_PROG +$attr $testfile
+
+	before=`$LSATTR_PROG $testfile`
+
+	$XFS_IO_PROG -f $testfile -c "fsync" | _filter_xfs_io
+
+	_scratch_shutdown | tee -a $seqres.full
+	_scratch_cycle_mount
+
+	after=`$LSATTR_PROG $testfile`
+
+	# check inode's i_flags
+	if [ "$before" != "$after" ]; then
+		echo "Before: $before"
+		echo "After : $after"
+	fi
+	echo "Before: $before" >> $seqres.full
+	echo "After : $after" >> $seqres.full
+
+	echo "Test chattr -$1" >> $seqres.full
+
+	# delete attribute
+	$CHATTR_PROG -$attr $testfile
+
+	before=`$LSATTR_PROG $testfile`
+
+	$XFS_IO_PROG -f $testfile -c "fsync" | _filter_xfs_io
+
+	_scratch_shutdown | tee -a $seqres.full
+	_scratch_cycle_mount
+
+	after=`$LSATTR_PROG $testfile`
+
+	# check inode's i_flags
+	if [ "$before" != "$after" ]; then
+		echo "Before: $before"
+		echo "After : $after"
+	fi
+	echo "Before: $before" >> $seqres.full
+	echo "After : $after" >> $seqres.full
+
+	rm -f $testfile
+	_scratch_unmount
+}
+
+echo "Silence is golden"
+
+opts="A s S u"
+for i in $opts; do
+	do_check $i
+	do_check $i sync
+done
+
+status=0
+exit

tests/generic/507.out

@@ -0,0 +1,2 @@
+QA output created by 507
+Silence is golden

tests/generic/group

@@ -509,3 +509,4 @@
 504 auto quick locks
 505 shutdown auto quick metadata
 506 shutdown auto quick metadata quota
+507 shutdown auto quick metadata