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block/export: vhost-user block device backend server

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By making use of libvhost-user, block device drive can be shared to
the connected vhost-user client. Only one client can connect to the
server one time.

Since vhost-user-server needs a block drive to be created first, delay
the creation of this object.

Suggested-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Coiby Xu <coiby.xu@gmail.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-id: 20200918080912.321299-6-coiby.xu@gmail.com
[Shorten "vhost_user_blk_server" string to "vhost_user_blk" to avoid the
following compiler warning:
../block/export/vhost-user-blk-server.c:178:50: error: ‘%s’ directive output truncated writing 21 bytes into a region of size 20 [-Werror=format-truncation=]
and fix "Invalid size %ld ..." ssize_t format string arguments for
32-bit hosts.
--Stefan]
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Coiby Xu 2020-09-18 16:09:10 +08:00 • committed by Stefan Hajnoczi
parent 5937835ac4
commit 3578389bcf
4 changed files with 702 additions and 0 deletions
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36
block/export/vhost-user-blk-server.h Normal file
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/*
* Sharing QEMU block devices via vhost-user protocal
*
* Copyright (c) Coiby Xu <coiby.xu@gmail.com>.
* Copyright (c) 2020 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.
*/
#ifndef VHOST_USER_BLK_SERVER_H
#define VHOST_USER_BLK_SERVER_H
#include "util/vhost-user-server.h"
typedef struct VuBlockDev VuBlockDev;
#define TYPE_VHOST_USER_BLK_SERVER "vhost-user-blk-server"
#define VHOST_USER_BLK_SERVER(obj) \
OBJECT_CHECK(VuBlockDev, obj, TYPE_VHOST_USER_BLK_SERVER)
/* vhost user block device */
struct VuBlockDev {
Object parent_obj;
char *node_name;
SocketAddress *addr;
AioContext *ctx;
VuServer vu_server;
bool running;
uint32_t blk_size;
BlockBackend *backend;
QIOChannelSocket *sioc;
QTAILQ_ENTRY(VuBlockDev) next;
struct virtio_blk_config blkcfg;
bool writable;
};
#endif /* VHOST_USER_BLK_SERVER_H */