Add basic io_uring test

Provide a basic test coverage for io_uring I/O.

Reviewed-by: Ryan Moeller <[email protected]>
Reviewed-by: Brian Behlendorf <[email protected]>
Signed-off-by: Matt Macy <[email protected]>
Closes openzfs#11497

tests/runfiles/linux.run

@@ -115,7 +115,7 @@ tests = ['large_dnode_002_pos', 'large_dnode_006_pos', 'large_dnode_008_pos']
 tags = ['functional', 'features', 'large_dnode']
 
 [tests/functional/io:Linux]
-tests = ['libaio']
+tests = ['libaio', 'io_uring']
 tags = ['functional', 'io']
 
 [tests/functional/mmap:Linux]

tests/test-runner/bin/zts-report.py.in

@@ -263,6 +263,7 @@ elif sys.platform.startswith('linux'):
         'cli_root/zpool_expand/zpool_expand_001_pos': ['FAIL', known_reason],
         'cli_root/zpool_expand/zpool_expand_005_pos': ['FAIL', known_reason],
         'cli_root/zpool_reopen/zpool_reopen_003_pos': ['FAIL', known_reason],
+        'io/io_uring': ['SKIP', 'io_uring support required'],
         'limits/filesystem_limit': ['SKIP', known_reason],
         'limits/snapshot_limit': ['SKIP', known_reason],
         'mmp/mmp_exported_import': ['FAIL', known_reason],

tests/zfs-tests/tests/functional/io/Makefile.am

@@ -5,6 +5,7 @@ dist_pkgdata_SCRIPTS = \
 	sync.ksh \
 	psync.ksh \
 	libaio.ksh \
+	io_uring.ksh \
 	posixaio.ksh \
 	mmap.ksh
 

tests/zfs-tests/tests/functional/io/io_uring.ksh

@@ -0,0 +1,72 @@
+#! /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
+#
+
+#
+# Copyright (c) 2018 by Lawrence Livermore National Security, LLC.
+#
+
+. $STF_SUITE/include/libtest.shlib
+. $STF_SUITE/tests/functional/io/io.cfg
+
+#
+# DESCRIPTION:
+#	Verify Linux io_uring.
+#
+# STRATEGY:
+#	1. Use fio(1) in verify mode to perform write, read,
+#	   random read, and random write workloads.
+#	2. Repeat the test with additional fio(1) options.
+#
+
+verify_runnable "global"
+
+
+if [[ $(linux_version) -lt $(linux_version "5.1") ]]; then
+	log_unsupported "Requires io_uring support"
+fi
+
+fio --ioengine=io_uring --parse-only || log_unsupported "io_uring support required"
+
+function cleanup
+{
+	log_must rm -f "$mntpnt/rw*"
+}
+
+log_assert "Verify Linux io_uring"
+
+log_onexit cleanup
+
+ioengine="--ioengine=io_uring"
+mntpnt=$(get_prop mountpoint $TESTPOOL/$TESTFS)
+dir="--directory=$mntpnt"
+
+set -A fio_arg -- "--sync=0" "--sync=1" "--direct=0" "--direct=1"
+
+for arg in "${fio_arg[@]}"; do
+	log_must fio $dir $ioengine $arg $FIO_WRITE_ARGS
+	log_must fio $dir $ioengine $arg $FIO_READ_ARGS
+	log_must fio $dir $ioengine $arg $FIO_RANDWRITE_ARGS
+	log_must fio $dir $ioengine $arg $FIO_RANDREAD_ARGS
+	log_must rm -f "$mntpnt/rw*"
+done
+
+log_pass "Verified Linux io_uring"