There is no need for aio_context_use_g_source() now that epoll(7) and
io_uring(7) file descriptor monitoring works with the glib event loop.
AioContext doesn't need to be notified that GSource is being used.

On hosts with io_uring support this now enables fdmon-io_uring.c by
default, replacing fdmon-poll.c and fdmon-epoll.c. In other words, the
event loop will use io_uring!

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
---
v5:
- Mention in commit message that fdmon-io_uring.c is the new default [Kevin]
---
 include/block/aio.h |  3 ---
 util/aio-posix.c    | 12 ------------
 util/aio-win32.c    |  4 ----
 util/async.c        |  1 -
 4 files changed, 20 deletions(-)

diff --git a/include/block/aio.h b/include/block/aio.h
index 39ed86d14d..1657740a0e 100644
--- a/include/block/aio.h
+++ b/include/block/aio.h
@@ -728,9 +728,6 @@ void aio_context_setup(AioContext *ctx);
  */
 void aio_context_destroy(AioContext *ctx);
 
-/* Used internally, do not call outside AioContext code */
-void aio_context_use_g_source(AioContext *ctx);
-
 /**
  * aio_context_set_poll_params:
  * @ctx: the aio context
diff --git a/util/aio-posix.c b/util/aio-posix.c
index 9de05ee7e8..bebd9ce3a2 100644
--- a/util/aio-posix.c
+++ b/util/aio-posix.c
@@ -743,18 +743,6 @@ void aio_context_destroy(AioContext *ctx)
     aio_free_deleted_handlers(ctx);
 }
 
-void aio_context_use_g_source(AioContext *ctx)
-{
-    /*
-     * Disable io_uring when the glib main loop is used because it doesn't
-     * support mixed glib/aio_poll() usage. It relies on aio_poll() being
-     * called regularly so that changes to the monitored file descriptors are
-     * submitted, otherwise a list of pending fd handlers builds up.
-     */
-    fdmon_io_uring_destroy(ctx);
-    aio_free_deleted_handlers(ctx);
-}
-
 void aio_context_set_poll_params(AioContext *ctx, int64_t max_ns,
                                  int64_t grow, int64_t shrink, Error **errp)
 {
diff --git a/util/aio-win32.c b/util/aio-win32.c
index c6fbce64c2..18cc9fb7a9 100644
--- a/util/aio-win32.c
+++ b/util/aio-win32.c
@@ -427,10 +427,6 @@ void aio_context_destroy(AioContext *ctx)
 {
 }
 
-void aio_context_use_g_source(AioContext *ctx)
-{
-}
-
 void aio_context_set_poll_params(AioContext *ctx, int64_t max_ns,
                                  int64_t grow, int64_t shrink, Error **errp)
 {
diff --git a/util/async.c b/util/async.c
index a736d2cd0d..cb72ad3777 100644
--- a/util/async.c
+++ b/util/async.c
@@ -433,7 +433,6 @@ static GSourceFuncs aio_source_funcs = {
 
 GSource *aio_get_g_source(AioContext *ctx)
 {
-    aio_context_use_g_source(ctx);
     g_source_ref(&ctx->source);
     return &ctx->source;
 }
-- 
2.51.1