Make a new btrfs/999 test that works the way Chris Mason suggested:
Build a filesystem with 2 devices that stripes the data across
both devices, but mirrors metadata across both. Then, make one
of the devices fail and see how fsync is handled.
Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxx>
---
tests/btrfs/999 | 93 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
tests/btrfs/group | 1 +
2 files changed, 94 insertions(+)
create mode 100755 tests/btrfs/999
diff --git a/tests/btrfs/999 b/tests/btrfs/999
new file mode 100755
index 000000000000..84031cc0d913
--- /dev/null
+++ b/tests/btrfs/999
@@ -0,0 +1,93 @@
+#! /bin/bash
+# FS QA Test No. 999
+#
+# Open a file several times, write to it, fsync on all fds and make sure that
+# they all return 0. Change the device to start throwing errors. Write again
+# on all fds and fsync on all fds. Ensure that we get errors on all of them.
+# Then fsync on all one last time and verify that all return 0.
+#
+#-----------------------------------------------------------------------
+# Copyright (c) 2017, Jeff Layton <jlayton@xxxxxxxxxx>
+#
+# 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 -rf $tmp.* $testdir
+ _dmerror_cleanup
+}
+
+# get standard environment, filters and checks
+. ./common/rc
+. ./common/filter
+. ./common/dmerror
+
+# real QA test starts here
+_supported_os Linux
+_require_dm_target error
+_require_test_program fsync-err
+_require_test_program dmerror
+
+# bring up dmerror device
+_scratch_unmount
+_dmerror_init
+
+# Replace first device with error-test device
+old_SCRATCH_DEV=$SCRATCH_DEV
+SCRATCH_DEV_POOL=`echo $SCRATCH_DEV_POOL | perl -pe "s#$SCRATCH_DEV#$DMERROR_DEV#"`
+SCRATCH_DEV=$DMERROR_DEV
+
+_require_scratch
+_require_scratch_dev_pool
+
+rm -f $seqres.full
+
+echo "Format and mount"
+
+_scratch_pool_mkfs "-d raid0 -m raid1" > $seqres.full 2>&1
+_scratch_mount
+
+# How much do we need to write? We need to hit all of the stripes. btrfs uses
+# a fixed 64k stripesize, so write enough to hit each one
+number_of_devices=`echo $SCRATCH_DEV_POOL | wc -w`
+write_kb=$(($number_of_devices * 64))
+_require_fs_space $SCRATCH_MNT $write_kb
+
+testfile=$SCRATCH_MNT/fsync-err-test
+
+SCRATCH_DEV=$old_SCRATCH_DEV
+$here/src/fsync-err -b $(($write_kb * 1024)) -d $here/src/dmerror $testfile
+
+# success, all done
+_dmerror_load_working_table
+
+# fs may be corrupt after this -- attempt to repair it
+_repair_scratch_fs >> $seqres.full
+
+# remove dmerror device
+_dmerror_cleanup
+
+status=0
+exit
diff --git a/tests/btrfs/group b/tests/btrfs/group
index 6f19619e877c..8dbdfbfe29fd 100644
--- a/tests/btrfs/group
+++ b/tests/btrfs/group
@@ -145,3 +145,4 @@
141 auto quick
142 auto quick
143 auto quick
+999 auto quick
--
2.13.0
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