[PATCH 4/3] generic/650: race mount and unmount with cpu hotplug too

["Darrick J. Wong" <djwong@kernel.org>]

From: Darrick J. Wong <djwong@kernel.org>

Ritesh Harjani reported that mount and unmount can race with the xfs cpu
hotplug notifier hooks and crash the kernel.  Extend this test to
include that.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
---
 tests/generic/650 |   13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/tests/generic/650 b/tests/generic/650
index 05c939b84f..773f93c7cb 100755
--- a/tests/generic/650
+++ b/tests/generic/650
@@ -67,11 +67,18 @@ fsstress_args=(-w -d $stress_dir)
 nr_cpus=$((LOAD_FACTOR * nr_hotplug_cpus))
 test "$nr_cpus" -gt 1024 && nr_cpus="$nr_hotplug_cpus"
 fsstress_args+=(-p $nr_cpus)
-test -n "$SOAK_DURATION" && fsstress_args+=(--duration="$SOAK_DURATION")
+if [ -n "$SOAK_DURATION" ]; then
+	test "$SOAK_DURATION" -lt 10 && SOAK_DURATION=10
+	fsstress_args+=(--duration="$((SOAK_DURATION / 10))")
+fi
 
-nr_ops=$((25000 * TIME_FACTOR))
+nr_ops=$((2500 * TIME_FACTOR))
 fsstress_args+=(-n $nr_ops)
-$FSSTRESS_PROG $FSSTRESS_AVOID -w "${fsstress_args[@]}" >> $seqres.full
+for ((i = 0; i < 10; i++)); do
+	$FSSTRESS_PROG $FSSTRESS_AVOID -w "${fsstress_args[@]}" >> $seqres.full
+	_test_cycle_mount
+done
+
 rm -f $sentinel_file
 
 # success, all done