[PATCH v4 2/2] xfs/006: new case to test xfs fail_at_unmount error handling

[Zorro Lang <zlang@redhat.com>]

XFS bring in a new configuration under /sys/fs/xfs/error, named
fail_at_unmount from below commit:

  a5ea70d xfs: add configuration of error failure speed

It's used to stop unmount retrying forever when it hit IO error.
This case try to unmount an faulty dm device, and to sure unmount
won't retry forever if fail_at_unmount=1.

Signed-off-by: Zorro Lang <zlang@redhat.com>
---

Hi,

V4 did below changes:
1) Due to common/rc changed, so change this case to use new function name.
2) Remove _pwrite_byte operation
3) After umount error device test, load working table back, and make sure
   fs consistent.

Thanks,
Zorro

 tests/xfs/006     | 81 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 tests/xfs/006.out |  2 ++
 tests/xfs/group   |  1 +
 3 files changed, 84 insertions(+)
 create mode 100755 tests/xfs/006
 create mode 100644 tests/xfs/006.out

diff --git a/tests/xfs/006 b/tests/xfs/006
new file mode 100755
index 0000000..be736f9
--- /dev/null
+++ b/tests/xfs/006
@@ -0,0 +1,81 @@
+#! /bin/bash
+# FS QA Test 006
+#
+# Test xfs' "fail at unmount" error handling configuration. Stop
+# XFS retrying to writeback forever when unmount.
+#
+#-----------------------------------------------------------------------
+# Copyright (c) 2016 YOUR NAME HERE.  All Rights Reserved.
+#
+# 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!
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+_cleanup()
+{
+	cd /
+	rm -f $tmp.*
+	_dmerror_cleanup
+}
+
+# get standard environment, filters and checks
+. ./common/rc
+. ./common/filter
+. ./common/dmerror
+
+# remove previous $seqres.full before test
+rm -f $seqres.full
+
+# real QA test starts here
+_supported_fs xfs
+_supported_os Linux
+_require_dm_target error
+_require_scratch
+
+_scratch_mkfs > $seqres.full 2>&1
+_require_fs_sysfs $SCRATCH_DEV error/fail_at_unmount
+
+# The device is still a linear device at here
+_dmerror_init
+_dmerror_mount
+
+# Enable fail_at_unmount
+_set_fs_sysfs_param $DMERROR_DEV error/fail_at_unmount 1
+
+
+# umount will cause XFS try to writeback something to root inode.
+# So after load error table, it can trigger umount fail.
+_dmerror_load_error_table
+_dmerror_unmount
+
+# Due to above operations cause fs inconsistent, that's expected.
+# But we need fs be consistent before this case end.
+_dmerror_load_working_table
+_dmerror_mount
+_dmerror_unmount
+
+echo "Silence is golden"
+
+# success, all done
+status=0
+exit
diff --git a/tests/xfs/006.out b/tests/xfs/006.out
new file mode 100644
index 0000000..675c1b7
--- /dev/null
+++ b/tests/xfs/006.out
@@ -0,0 +1,2 @@
+QA output created by 006
+Silence is golden
diff --git a/tests/xfs/group b/tests/xfs/group
index f4c6816..39169ea 100644
--- a/tests/xfs/group
+++ b/tests/xfs/group
@@ -4,6 +4,7 @@
 004 db auto quick
 005 auto quick
 007 auto quota quick
+006 auto quick unmount
 008 rw ioctl auto quick
 009 rw ioctl auto prealloc quick
 010 auto quick repair
-- 
2.5.5