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stubs: add stubs for io_uring interface 

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>
This commit is contained in:
Aarushi Mehta 2020-01-20 14:18:48 +00:00 committed by Stefan Hajnoczi
parent 6663a0a337
commit 06a47ef57c
3 changed files with 34 additions and 0 deletions
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1
MAINTAINERS
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@ -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
qcow2
M: Kevin Wolf <kwolf@redhat.com>

1
stubs/Makefile.objs
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@ -13,6 +13,7 @@ stub-obj-y += iothread.o
stub-obj-y += iothread-lock.o
stub-obj-y += is-daemonized.o
stub-obj-$(CONFIG_LINUX_AIO) += linux-aio.o
stub-obj-$(CONFIG_LINUX_IO_URING) += io_uring.o
stub-obj-y += machine-init-done.o
stub-obj-y += migr-blocker.o
stub-obj-y += change-state-handler.o

32
stubs/io_uring.c Normal file
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@ -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 later.
* 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();
}