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aio-posix: fix io_uring with external events

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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 <jusual@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Message-id: 20200319163559.117903-1-stefanha@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2020-03-19 16:35:59 +00:00
parent 29e0855c5a
commit ff807d5592
1 changed files with 12 additions and 1 deletions
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13
util/fdmon-io_uring.c
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@ -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 = {