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From 38f4c8c2161484794015df1d44a8e84d7e4cddb3 Mon Sep 17 00:00:00 2001
From: Kevin Wolf <kwolf@redhat.com>
Date: Wed, 10 Oct 2018 20:21:51 +0100
Subject: [PATCH 25/49] test-bdrv-drain: Test bdrv_append() to drained node

RH-Author: Kevin Wolf <kwolf@redhat.com>
Message-id: <20181010202213.7372-13-kwolf@redhat.com>
Patchwork-id: 82602
O-Subject: [RHEL-8 qemu-kvm PATCH 22/44] test-bdrv-drain: Test bdrv_append() to drained node
Bugzilla: 1637976
RH-Acked-by: Max Reitz <mreitz@redhat.com>
RH-Acked-by: John Snow <jsnow@redhat.com>
RH-Acked-by: Thomas Huth <thuth@redhat.com>

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
(cherry picked from commit b994c5bc515fe611885113e7cfa7e87817bfd4e2)
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
---
 tests/test-bdrv-drain.c | 43 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/tests/test-bdrv-drain.c b/tests/test-bdrv-drain.c
index 1c8162f..9bcb3c7 100644
--- a/tests/test-bdrv-drain.c
+++ b/tests/test-bdrv-drain.c
@@ -1245,6 +1245,47 @@ static void test_detach_by_driver_cb(void)
     test_detach_indirect(false);
 }
 
+static void test_append_to_drained(void)
+{
+    BlockBackend *blk;
+    BlockDriverState *base, *overlay;
+    BDRVTestState *base_s, *overlay_s;
+
+    blk = blk_new(BLK_PERM_ALL, BLK_PERM_ALL);
+    base = bdrv_new_open_driver(&bdrv_test, "base", BDRV_O_RDWR, &error_abort);
+    base_s = base->opaque;
+    blk_insert_bs(blk, base, &error_abort);
+
+    overlay = bdrv_new_open_driver(&bdrv_test, "overlay", BDRV_O_RDWR,
+                                   &error_abort);
+    overlay_s = overlay->opaque;
+
+    do_drain_begin(BDRV_DRAIN, base);
+    g_assert_cmpint(base->quiesce_counter, ==, 1);
+    g_assert_cmpint(base_s->drain_count, ==, 1);
+    g_assert_cmpint(base->in_flight, ==, 0);
+
+    /* Takes ownership of overlay, so we don't have to unref it later */
+    bdrv_append(overlay, base, &error_abort);
+    g_assert_cmpint(base->in_flight, ==, 0);
+    g_assert_cmpint(overlay->in_flight, ==, 0);
+
+    g_assert_cmpint(base->quiesce_counter, ==, 1);
+    g_assert_cmpint(base_s->drain_count, ==, 1);
+    g_assert_cmpint(overlay->quiesce_counter, ==, 1);
+    g_assert_cmpint(overlay_s->drain_count, ==, 1);
+
+    do_drain_end(BDRV_DRAIN, base);
+
+    g_assert_cmpint(base->quiesce_counter, ==, 0);
+    g_assert_cmpint(base_s->drain_count, ==, 0);
+    g_assert_cmpint(overlay->quiesce_counter, ==, 0);
+    g_assert_cmpint(overlay_s->drain_count, ==, 0);
+
+    bdrv_unref(base);
+    blk_unref(blk);
+}
+
 int main(int argc, char **argv)
 {
     int ret;
@@ -1303,6 +1344,8 @@ int main(int argc, char **argv)
     g_test_add_func("/bdrv-drain/detach/parent_cb", test_detach_by_parent_cb);
     g_test_add_func("/bdrv-drain/detach/driver_cb", test_detach_by_driver_cb);
 
+    g_test_add_func("/bdrv-drain/attach/drain", test_append_to_drained);
+
     ret = g_test_run();
     qemu_event_destroy(&done_event);
     return ret;
-- 
1.8.3.1