From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:51894) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fUxHR-0004tm-No for qemu-devel@nongnu.org; Mon, 18 Jun 2018 12:45:27 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fUxHQ-0006I6-IW for qemu-devel@nongnu.org; Mon, 18 Jun 2018 12:45:25 -0400 From: Kevin Wolf Date: Mon, 18 Jun 2018 18:44:40 +0200 Message-Id: <20180618164504.24488-12-kwolf@redhat.com> In-Reply-To: <20180618164504.24488-1-kwolf@redhat.com> References: <20180618164504.24488-1-kwolf@redhat.com> Subject: [Qemu-devel] [PULL 11/35] test-bdrv-drain: Test node deletion in subtree recursion List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-block@nongnu.org Cc: kwolf@redhat.com, qemu-devel@nongnu.org If bdrv_do_drained_begin() polls during its subtree recursion, the graph can change and mess up the bs->children iteration. Test that this doesn't happen. Signed-off-by: Kevin Wolf --- tests/test-bdrv-drain.c | 38 +++++++++++++++++++++++++++++--------- 1 file changed, 29 insertions(+), 9 deletions(-) diff --git a/tests/test-bdrv-drain.c b/tests/test-bdrv-drain.c index e8a5515b08..0c8f632f2d 100644 --- a/tests/test-bdrv-drain.c +++ b/tests/test-bdrv-drain.c @@ -880,7 +880,8 @@ static void coroutine_fn test_co_delete_by_drain(void *opaque) * If @detach_instead_of_delete is set, the BDS is not going to be * deleted but will only detach all of its children. */ -static void do_test_delete_by_drain(bool detach_instead_of_delete) +static void do_test_delete_by_drain(bool detach_instead_of_delete, + enum drain_type drain_type) { BlockBackend *blk; BlockDriverState *bs, *child_bs, *null_bs; @@ -936,9 +937,23 @@ static void do_test_delete_by_drain(bool detach_instead_of_delete) * test_co_delete_by_drain() resuming. Thus, @bs will be deleted * and the coroutine will exit while this drain operation is still * in progress. */ - bdrv_ref(child_bs); - bdrv_drain(child_bs); - bdrv_unref(child_bs); + switch (drain_type) { + case BDRV_DRAIN: + bdrv_ref(child_bs); + bdrv_drain(child_bs); + bdrv_unref(child_bs); + break; + case BDRV_SUBTREE_DRAIN: + /* Would have to ref/unref bs here for !detach_instead_of_delete, but + * then the whole test becomes pointless because the graph changes + * don't occur during the drain any more. */ + assert(detach_instead_of_delete); + bdrv_subtree_drained_begin(bs); + bdrv_subtree_drained_end(bs); + break; + default: + g_assert_not_reached(); + } while (!dbdd.done) { aio_poll(qemu_get_aio_context(), true); @@ -951,15 +966,19 @@ static void do_test_delete_by_drain(bool detach_instead_of_delete) } } - static void test_delete_by_drain(void) { - do_test_delete_by_drain(false); + do_test_delete_by_drain(false, BDRV_DRAIN); } static void test_detach_by_drain(void) { - do_test_delete_by_drain(true); + do_test_delete_by_drain(true, BDRV_DRAIN); +} + +static void test_detach_by_drain_subtree(void) +{ + do_test_delete_by_drain(true, BDRV_SUBTREE_DRAIN); } @@ -1010,8 +1029,9 @@ int main(int argc, char **argv) g_test_add_func("/bdrv-drain/blockjob/drain_subtree", test_blockjob_drain_subtree); - g_test_add_func("/bdrv-drain/deletion", test_delete_by_drain); - g_test_add_func("/bdrv-drain/detach", test_detach_by_drain); + g_test_add_func("/bdrv-drain/deletion/drain", test_delete_by_drain); + g_test_add_func("/bdrv-drain/detach/drain", test_detach_by_drain); + g_test_add_func("/bdrv-drain/detach/drain_subtree", test_detach_by_drain_subtree); ret = g_test_run(); qemu_event_destroy(&done_event); -- 2.13.6