From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:32772) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YLk5p-00029b-I1 for qemu-devel@nongnu.org; Wed, 11 Feb 2015 22:05:33 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1YLk5k-00018d-Uc for qemu-devel@nongnu.org; Wed, 11 Feb 2015 22:05:29 -0500 Received: from [59.151.112.132] (port=54799 helo=heian.cn.fujitsu.com) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YLk5j-00016N-Hr for qemu-devel@nongnu.org; Wed, 11 Feb 2015 22:05:24 -0500 From: Wen Congyang Date: Thu, 12 Feb 2015 11:07:14 +0800 Message-ID: <1423710438-14377-11-git-send-email-wency@cn.fujitsu.com> In-Reply-To: <1423710438-14377-1-git-send-email-wency@cn.fujitsu.com> References: <1423710438-14377-1-git-send-email-wency@cn.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain Subject: [Qemu-devel] [RFC PATCH 10/14] allow the backing image access the origin BlockDriverState List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu devel , Kevin Wolf , Stefan Hajnoczi , Paolo Bonzini Cc: Lai Jiangshan , Jiang Yunhong , Dong Eddie , "Dr. David Alan Gilbert" , Gonglei , Yang Hongyang , zhanghailiang Block replication needs this feature. Signed-off-by: Wen Congyang Signed-off-by: zhanghailiang Signed-off-by: Gonglei --- block.c | 2 ++ include/block/block_int.h | 2 ++ 2 files changed, 4 insertions(+) diff --git a/block.c b/block.c index a7a8932..067c44b 100644 --- a/block.c +++ b/block.c @@ -1181,6 +1181,7 @@ void bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_hd) if (bs->backing_hd) { assert(bs->backing_blocker); bdrv_op_unblock_all(bs->backing_hd, bs->backing_blocker); + bs->backing_hd->origin_file = NULL; } else if (backing_hd) { error_setg(&bs->backing_blocker, "device is used as backing hd of '%s'", @@ -1193,6 +1194,7 @@ void bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_hd) bs->backing_blocker = NULL; goto out; } + backing_hd->origin_file = bs; bs->open_flags &= ~BDRV_O_NO_BACKING; pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_hd->filename); pstrcpy(bs->backing_format, sizeof(bs->backing_format), diff --git a/include/block/block_int.h b/include/block/block_int.h index 603f704..9be13a8 100644 --- a/include/block/block_int.h +++ b/include/block/block_int.h @@ -360,6 +360,8 @@ struct BlockDriverState { char exact_filename[PATH_MAX]; BlockDriverState *backing_hd; + /* used by backing image */ + BlockDriverState *origin_file; BlockDriverState *file; NotifierList close_notifiers; -- 2.1.0