From ff807d559205a434fd37d3343f01a0ab128bd190 Mon Sep 17 00:00:00 2001 From: Stefan Hajnoczi Date: Thu, 19 Mar 2020 16:35:59 +0000 Subject: [PATCH] aio-posix: fix io_uring with external events When external event sources are disabled fdmon-io_uring falls back to fdmon-poll. The ->need_wait() callback needs to watch for this so it can return true when external event sources are disabled. It is also necessary to call ->wait() when AioHandlers have changed because io_uring is asynchronous and we must submit new sqes. Both of these changes to ->need_wait() together fix tests/test-aio -p /aio/external-client, which failed with: test-aio: tests/test-aio.c:404: test_aio_external_client: Assertion `aio_poll(ctx, false)' failed. Reported-by: Julia Suvorova Signed-off-by: Stefan Hajnoczi Reviewed-by: Stefano Garzarella Message-id: 20200319163559.117903-1-stefanha@redhat.com Signed-off-by: Stefan Hajnoczi --- util/fdmon-io_uring.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/util/fdmon-io_uring.c b/util/fdmon-io_uring.c index 893b79b622..7e143ef515 100644 --- a/util/fdmon-io_uring.c +++ b/util/fdmon-io_uring.c @@ -290,7 +290,18 @@ static int fdmon_io_uring_wait(AioContext *ctx, AioHandlerList *ready_list, static bool fdmon_io_uring_need_wait(AioContext *ctx) { - return io_uring_cq_ready(&ctx->fdmon_io_uring); + /* Have io_uring events completed? */ + if (io_uring_cq_ready(&ctx->fdmon_io_uring)) { + return true; + } + + /* Do we need to submit new io_uring sqes? */ + if (!QSLIST_EMPTY_RCU(&ctx->submit_list)) { + return true; + } + + /* Are we falling back to fdmon-poll? */ + return atomic_read(&ctx->external_disable_cnt); } static const FDMonOps fdmon_io_uring_ops = {