From 42e3c5ffd920f549a0202bd305bbc5e08e0469ff Mon Sep 17 00:00:00 2001
From: Ryan Moeller <ryan@iXsystems.com>
Date: Tue, 23 Mar 2021 21:13:32 +0000
Subject: [PATCH] ZTS: Add test for deadman event ratelimit

Signed-off-by: Ryan Moeller <ryan@iXsystems.com>
---
 tests/runfiles/common.run                     |  2 +-
 .../tests/functional/deadman/Makefile.am      |  1 +
 .../functional/deadman/deadman_ratelimit.ksh  | 77 +++++++++++++++++++
 3 files changed, 79 insertions(+), 1 deletion(-)
 create mode 100755 tests/zfs-tests/tests/functional/deadman/deadman_ratelimit.ksh

diff --git a/tests/runfiles/common.run b/tests/runfiles/common.run
index 569b5f3ee83b..32be9ef057f1 100644
--- a/tests/runfiles/common.run
+++ b/tests/runfiles/common.run
@@ -578,7 +578,7 @@ tests = ['ctime_001_pos' ]
 tags = ['functional', 'ctime']
 
 [tests/functional/deadman]
-tests = ['deadman_sync', 'deadman_zio']
+tests = ['deadman_ratelimit', 'deadman_sync', 'deadman_zio']
 pre =
 post =
 tags = ['functional', 'deadman']
diff --git a/tests/zfs-tests/tests/functional/deadman/Makefile.am b/tests/zfs-tests/tests/functional/deadman/Makefile.am
index 7b70ca09df56..097f23e88404 100644
--- a/tests/zfs-tests/tests/functional/deadman/Makefile.am
+++ b/tests/zfs-tests/tests/functional/deadman/Makefile.am
@@ -1,5 +1,6 @@
 pkgdatadir = $(datadir)/@PACKAGE@/zfs-tests/tests/functional/deadman
 dist_pkgdata_SCRIPTS = \
+	deadman_ratelimit.ksh \
 	deadman_sync.ksh \
 	deadman_zio.ksh
 
diff --git a/tests/zfs-tests/tests/functional/deadman/deadman_ratelimit.ksh b/tests/zfs-tests/tests/functional/deadman/deadman_ratelimit.ksh
new file mode 100755
index 000000000000..055ba3491524
--- /dev/null
+++ b/tests/zfs-tests/tests/functional/deadman/deadman_ratelimit.ksh
@@ -0,0 +1,77 @@
+#!/bin/ksh -p
+#
+# CDDL HEADER START
+#
+# The contents of this file are subject to the terms of the
+# Common Development and Distribution License (the "License").
+# You may not use this file except in compliance with the License.
+#
+# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+# or http://www.opensolaris.org/os/licensing.
+# See the License for the specific language governing permissions
+# and limitations under the License.
+#
+# When distributing Covered Code, include this CDDL HEADER in each
+# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+# If applicable, add the following below this CDDL HEADER, with the
+# fields enclosed by brackets "[]" replaced with your own identifying
+# information: Portions Copyright [yyyy] [name of copyright owner]
+#
+# CDDL HEADER END
+#
+
+#
+# Portions Copyright 2021 iXsystems, Inc.
+#
+
+# DESCRIPTION:
+#	Verify spa deadman events are rate limited
+#
+# STRATEGY:
+#	1. Reduce the zfs_slow_io_events_per_second to 1.
+#	2. Reduce the zfs_deadman_ziotime_ms to 1ms.
+#	3. Write data to a pool and read it back.
+#	4. Verify events have been dropped.
+#
+
+. $STF_SUITE/include/libtest.shlib
+. $STF_SUITE/tests/functional/deadman/deadman.cfg
+
+verify_runnable "both"
+
+function cleanup
+{
+	default_cleanup_noexit
+
+	set_tunable64 SLOW_IO_EVENTS_PER_SECOND $OLD_SLOW_IO_EVENTS
+	set_tunable64 DEADMAN_ZIOTIME_MS $ZIOTIME_DEFAULT
+}
+
+log_assert "Verify spa deadman events are rate limited"
+log_onexit cleanup
+
+OLD_SLOW_IO_EVENTS=$(get_tunable SLOW_IO_EVENTS_PER_SECOND)
+log_must set_tunable64 SLOW_IO_EVENTS_PER_SECOND 1
+log_must set_tunable64 DEADMAN_ZIOTIME_MS 1
+
+# Create a new pool in order to use the updated deadman settings.
+default_setup_noexit $DISK1
+log_must zpool events -c
+
+mntpnt=$(get_prop mountpoint $TESTPOOL/$TESTFS)
+log_must file_write -b 1048576 -c 8 -o create -d 0 -f $mntpnt/file
+log_must zinject -a
+log_must dd if=$mntpnt/file of=$TEST_BASE_DIR/devnull oflag=sync
+sleep 10
+
+log_must eval "zpool events $TESTPOOL | grep -q dropped"
+events=$(zpool events $TESTPOOL | grep -c ereport.fs.zfs.deadman)
+log_note "events=$events"
+if [ "$events" -lt 1 ]; then
+	log_fail "Expect >= 1 deadman events, $events found"
+fi
+if [ "$events" -gt 10 ]; then
+	log_fail "Expect <= 10 deadman events, $events found"
+fi
+
+log_pass "Verify spa deadman events are rate limited"