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From 7a587bf1f9cac772532a41e31202fd7ef8646928 Mon Sep 17 00:00:00 2001
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From: Kevin Wolf <kwolf@redhat.com>
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Date: Fri, 14 Sep 2018 10:55:09 +0200
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Subject: [PATCH 18/49] test-bdrv-drain: Test node deletion in subtree
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recursion
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RH-Author: Kevin Wolf <kwolf@redhat.com>
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Message-id: <20180914105540.18077-12-kwolf@redhat.com>
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Patchwork-id: 82159
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O-Subject: [RHV-7.6 qemu-kvm-rhev PATCH 11/42] test-bdrv-drain: Test node deletion in subtree recursion
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Bugzilla: 1601212
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RH-Acked-by: John Snow <jsnow@redhat.com>
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RH-Acked-by: Max Reitz <mreitz@redhat.com>
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RH-Acked-by: Fam Zheng <famz@redhat.com>
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If bdrv_do_drained_begin() polls during its subtree recursion, the graph
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can change and mess up the bs->children iteration. Test that this
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doesn't happen.
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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(cherry picked from commit ebd31837618cdc7bda83090773dcdd87475d55b7)
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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tests/test-bdrv-drain.c | 38 +++++++++++++++++++++++++++++---------
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1 file changed, 29 insertions(+), 9 deletions(-)
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diff --git a/tests/test-bdrv-drain.c b/tests/test-bdrv-drain.c
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index 8918a94..38706b0 100644
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--- a/tests/test-bdrv-drain.c
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+++ b/tests/test-bdrv-drain.c
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@@ -875,7 +875,8 @@ static void coroutine_fn test_co_delete_by_drain(void *opaque)
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* If @detach_instead_of_delete is set, the BDS is not going to be
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* deleted but will only detach all of its children.
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*/
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-static void do_test_delete_by_drain(bool detach_instead_of_delete)
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+static void do_test_delete_by_drain(bool detach_instead_of_delete,
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+ enum drain_type drain_type)
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{
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BlockBackend *blk;
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BlockDriverState *bs, *child_bs, *null_bs;
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@@ -931,9 +932,23 @@ static void do_test_delete_by_drain(bool detach_instead_of_delete)
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* test_co_delete_by_drain() resuming. Thus, @bs will be deleted
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* and the coroutine will exit while this drain operation is still
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* in progress. */
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- bdrv_ref(child_bs);
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- bdrv_drain(child_bs);
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- bdrv_unref(child_bs);
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+ switch (drain_type) {
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+ case BDRV_DRAIN:
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+ bdrv_ref(child_bs);
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+ bdrv_drain(child_bs);
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+ bdrv_unref(child_bs);
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+ break;
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+ case BDRV_SUBTREE_DRAIN:
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+ /* Would have to ref/unref bs here for !detach_instead_of_delete, but
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+ * then the whole test becomes pointless because the graph changes
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+ * don't occur during the drain any more. */
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+ assert(detach_instead_of_delete);
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+ bdrv_subtree_drained_begin(bs);
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+ bdrv_subtree_drained_end(bs);
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+ break;
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+ default:
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+ g_assert_not_reached();
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+ }
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while (!dbdd.done) {
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aio_poll(qemu_get_aio_context(), true);
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@@ -946,15 +961,19 @@ static void do_test_delete_by_drain(bool detach_instead_of_delete)
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}
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}
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-
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static void test_delete_by_drain(void)
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{
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- do_test_delete_by_drain(false);
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+ do_test_delete_by_drain(false, BDRV_DRAIN);
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}
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static void test_detach_by_drain(void)
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{
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- do_test_delete_by_drain(true);
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+ do_test_delete_by_drain(true, BDRV_DRAIN);
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+}
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+
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+static void test_detach_by_drain_subtree(void)
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+{
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+ do_test_delete_by_drain(true, BDRV_SUBTREE_DRAIN);
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}
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@@ -1005,8 +1024,9 @@ int main(int argc, char **argv)
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g_test_add_func("/bdrv-drain/blockjob/drain_subtree",
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test_blockjob_drain_subtree);
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- g_test_add_func("/bdrv-drain/deletion", test_delete_by_drain);
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- g_test_add_func("/bdrv-drain/detach", test_detach_by_drain);
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+ g_test_add_func("/bdrv-drain/deletion/drain", test_delete_by_drain);
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+ g_test_add_func("/bdrv-drain/detach/drain", test_detach_by_drain);
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+ g_test_add_func("/bdrv-drain/detach/drain_subtree", test_detach_by_drain_subtree);
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ret = g_test_run();
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qemu_event_destroy(&done_event);
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--
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1.8.3.1
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