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From: Stefan Hajnoczi <stefanha@redhat.com>
To: qemu-devel@nongnu.org
Subject: [PULL 08/18] stubs: add stubs for io_uring interface
Date: Thu, 30 Jan 2020 21:31:04 +0000
Message-Id: <20200130213114.325157-9-stefanha@redhat.com>
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From: Aarushi Mehta <mehta.aaru20@gmail.com>
Follow linux-aio.o and stub out the block/io_uring.o APIs that will be
missing when a binary is linked with obj-util-y but without
block-util-y (e.g. vhost-user-gpu).
For example, the stubs are necessary so that a binary using util/async.o
from obj-util-y for qemu_bh_new() links successfully. In this case
block/io_uring.o from block-util-y isn't needed and we can avoid
dragging in the block layer by linking the stubs instead. The stub
functions never get called.
Signed-off-by: Aarushi Mehta <mehta.aaru20@gmail.com>
Acked-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 20200120141858.587874-6-stefanha@redhat.com
Message-Id: <20200120141858.587874-6-stefanha@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
---
MAINTAINERS | 1 +
stubs/Makefile.objs | 1 +
stubs/io_uring.c | 32 ++++++++++++++++++++++++++++++++
3 files changed, 34 insertions(+)
create mode 100644 stubs/io_uring.c
diff --git a/MAINTAINERS b/MAINTAINERS
index a19437c13d..4ceb1ad882 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2641,6 +2641,7 @@ M: Stefan Hajnoczi <stefanha@redhat.com>
L: qemu-block@nongnu.org
S: Maintained
F: block/io_uring.c
+F: stubs/io_uring.c
=20
qcow2
M: Kevin Wolf <kwolf@redhat.com>
diff --git a/stubs/Makefile.objs b/stubs/Makefile.objs
index 8b0ff25508..7afbe5fb61 100644
--- a/stubs/Makefile.objs
+++ b/stubs/Makefile.objs
@@ -13,6 +13,7 @@ stub-obj-y +=3D iothread.o
stub-obj-y +=3D iothread-lock.o
stub-obj-y +=3D is-daemonized.o
stub-obj-$(CONFIG_LINUX_AIO) +=3D linux-aio.o
+stub-obj-$(CONFIG_LINUX_IO_URING) +=3D io_uring.o
stub-obj-y +=3D machine-init-done.o
stub-obj-y +=3D migr-blocker.o
stub-obj-y +=3D change-state-handler.o
diff --git a/stubs/io_uring.c b/stubs/io_uring.c
new file mode 100644
index 0000000000..622d1e4648
--- /dev/null
+++ b/stubs/io_uring.c
@@ -0,0 +1,32 @@
+/*
+ * Linux io_uring support.
+ *
+ * Copyright (C) 2009 IBM, Corp.
+ * Copyright (C) 2009 Red Hat, Inc.
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or late=
r.
+ * See the COPYING file in the top-level directory.
+ */
+#include "qemu/osdep.h"
+#include "block/aio.h"
+#include "block/raw-aio.h"
+
+void luring_detach_aio_context(LuringState *s, AioContext *old_context)
+{
+ abort();
+}
+
+void luring_attach_aio_context(LuringState *s, AioContext *new_context)
+{
+ abort();
+}
+
+LuringState *luring_init(Error **errp)
+{
+ abort();
+}
+
+void luring_cleanup(LuringState *s)
+{
+ abort();
+}
--=20
2.24.1