[PATCH v2] generic/388: randomly recover via read-only mounts

[Brian Foster <bfoster@redhat.com>]

XFS has an issue where superblock counters may not be properly
synced when recovery occurs via a read-only mount. This causes the
filesystem to become inconsistent after unmount. To cover this test
case, update generic/388 to switch between read-only and read-write
mounts to perform log recovery.

Signed-off-by: Brian Foster <bfoster@redhat.com>
---

v2:
- Tweak ro -> rw mount cycle error message to be unique.
v1: https://lore.kernel.org/fstests/20201217145941.2513069-1-bfoster@redhat.com/

 tests/generic/388 | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/tests/generic/388 b/tests/generic/388
index 451a6be2..2f97f266 100755
--- a/tests/generic/388
+++ b/tests/generic/388
@@ -66,8 +66,14 @@ for i in $(seq 1 $((50 * TIME_FACTOR)) ); do
 		ps -e | grep fsstress > /dev/null 2>&1
 	done
 
-	# quit if mount fails so we don't shutdown the host fs
-	_scratch_cycle_mount || _fail "cycle mount failed"
+	# Toggle between rw and ro mounts for recovery. Quit if any mount
+	# attempt fails so we don't shutdown the host fs.
+	if [ $((RANDOM % 2)) -eq 0 ]; then
+		_scratch_cycle_mount || _fail "cycle mount failed"
+	else
+		_scratch_cycle_mount "ro" || _fail "cycle ro mount failed"
+		_scratch_cycle_mount || _fail "cycle rw mount failed"
+	fi
 done
 
 # success, all done
-- 
2.26.2