[PULL 25/28] iotests/308: Add multi-threading sanity test

[Kevin Wolf <kwolf@redhat.com>]

From: Hanna Czenczek <hreitz@redhat.com>

Run qemu-img bench on a simple multi-threaded FUSE export to test that
it works.

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Hanna Czenczek <hreitz@redhat.com>
Message-ID: <20260309150856.26800-26-hreitz@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 tests/qemu-iotests/308     | 51 ++++++++++++++++++++++++++++++++++
 tests/qemu-iotests/308.out | 56 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 107 insertions(+)

diff --git a/tests/qemu-iotests/308 b/tests/qemu-iotests/308
index a83c6fc01fb..f4a06a522ef 100755
--- a/tests/qemu-iotests/308
+++ b/tests/qemu-iotests/308
@@ -441,6 +441,57 @@ $QEMU_IO -c 'read -P 0 0 64M' "$TEST_IMG" | _filter_qemu_io
 
 _cleanup_test_img
 
+echo
+echo '=== Multi-threading ==='
+
+# Just set up a null block device, export it (with multi-threading), and run
+# qemu-img bench on it (to get parallel requests)
+
+_launch_qemu
+_send_qemu_cmd $QEMU_HANDLE \
+    "{'execute': 'qmp_capabilities'}" \
+    'return'
+
+_send_qemu_cmd $QEMU_HANDLE \
+    "{'execute': 'blockdev-add',
+      'arguments': {
+          'driver': 'null-co',
+          'node-name': 'null'
+      } }" \
+    'return'
+
+for id in iothread{0,1,2,3}; do
+    _send_qemu_cmd $QEMU_HANDLE \
+        "{'execute': 'object-add',
+          'arguments': {
+              'qom-type': 'iothread',
+              'id': '$id'
+          } }" \
+        'return'
+done
+
+echo
+
+iothreads="['iothread0', 'iothread1', 'iothread2', 'iothread3']"
+fuse_export_add \
+    'export' \
+    "'mountpoint': '$EXT_MP', 'iothread': $iothreads" \
+    'return' \
+    'null'
+
+echo
+$QEMU_IMG bench -f raw "$EXT_MP" |
+    sed -e 's/[0-9.]\+ seconds/X.XXX seconds/'
+echo
+
+fuse_export_del 'export'
+
+_send_qemu_cmd $QEMU_HANDLE \
+    "{'execute': 'quit'}" \
+    'return'
+
+wait=yes _cleanup_qemu
+
 # success, all done
 echo "*** done"
 rm -f $seq.full
diff --git a/tests/qemu-iotests/308.out b/tests/qemu-iotests/308.out
index ebeaf64b486..580cc94e92f 100644
--- a/tests/qemu-iotests/308.out
+++ b/tests/qemu-iotests/308.out
@@ -217,4 +217,60 @@ read 67108864/67108864 bytes at offset 0
 {"return": {}}
 read 67108864/67108864 bytes at offset 0
 64 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+=== Multi-threading ===
+{'execute': 'qmp_capabilities'}
+{"return": {}}
+{'execute': 'blockdev-add',
+      'arguments': {
+          'driver': 'null-co',
+          'node-name': 'null'
+      } }
+{"return": {}}
+{'execute': 'object-add',
+          'arguments': {
+              'qom-type': 'iothread',
+              'id': 'iothread0'
+          } }
+{"return": {}}
+{'execute': 'object-add',
+          'arguments': {
+              'qom-type': 'iothread',
+              'id': 'iothread1'
+          } }
+{"return": {}}
+{'execute': 'object-add',
+          'arguments': {
+              'qom-type': 'iothread',
+              'id': 'iothread2'
+          } }
+{"return": {}}
+{'execute': 'object-add',
+          'arguments': {
+              'qom-type': 'iothread',
+              'id': 'iothread3'
+          } }
+{"return": {}}
+
+{'execute': 'block-export-add',
+          'arguments': {
+              'type': 'fuse',
+              'id': 'export',
+              'node-name': 'null',
+              'mountpoint': 'TEST_DIR/t.IMGFMT.fuse', 'iothread': ['iothread0', 'iothread1', 'iothread2', 'iothread3']
+          } }
+{"return": {}}
+
+Sending 75000 read requests, 4096 bytes each, 64 in parallel (starting at offset 0, step size 4096)
+Run completed in X.XXX seconds.
+
+{'execute': 'block-export-del',
+          'arguments': {
+              'id': 'export'
+          } }
+{"return": {}}
+{"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": "BLOCK_EXPORT_DELETED", "data": {"id": "export"}}
+{'execute': 'quit'}
+{"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": "SHUTDOWN", "data": {"guest": false, "reason": "host-qmp-quit"}}
+{"return": {}}
 *** done
-- 
2.53.0