From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:57156) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1VjjFF-0007n4-Pb for qemu-devel@nongnu.org; Fri, 22 Nov 2013 00:25:39 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1VjjF9-0004dk-PN for qemu-devel@nongnu.org; Fri, 22 Nov 2013 00:25:33 -0500 Received: from mx1.redhat.com ([209.132.183.28]:51774) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1VjjF9-0004dg-EH for qemu-devel@nongnu.org; Fri, 22 Nov 2013 00:25:27 -0500 Received: from int-mx12.intmail.prod.int.phx2.redhat.com (int-mx12.intmail.prod.int.phx2.redhat.com [10.5.11.25]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id rAM5PQfc031440 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK) for ; Fri, 22 Nov 2013 00:25:26 -0500 From: Fam Zheng Date: Fri, 22 Nov 2013 13:24:54 +0800 Message-Id: <1385097894-1380-8-git-send-email-famz@redhat.com> In-Reply-To: <1385097894-1380-1-git-send-email-famz@redhat.com> References: <1385097894-1380-1-git-send-email-famz@redhat.com> Subject: [Qemu-devel] [PATCH v4 7/7] block: Allow backup on referenced named BlockDriverState List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: kwolf@redhat.com, hbrock@redhat.com, rjones@redhat.com, imain@redhat.com, stefanha@redhat.com, pbonzini@redhat.com Drive backup is a read only operation on source bs. We want to allow this specific case to enable image-fleecing. Note that when image-fleecing job starts, the job still add its blocker to source bs, and any other operation on it will be blocked by that. Signed-off-by: Fam Zheng --- block.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/block.c b/block.c index a5da656..d30be51 100644 --- a/block.c +++ b/block.c @@ -1179,6 +1179,8 @@ int bdrv_open(BlockDriverState *bs, const char *filename, QDict *options, "device is used as backing hd of '%s'", bs->device_name); bdrv_op_block_all(bs->backing_hd, bs->backing_blocker); + bdrv_op_unblock(bs->backing_hd, BLOCK_OP_TYPE_BACKUP, + bs->backing_blocker); pstrcpy(bs->backing_file, sizeof(bs->backing_file), bs->backing_hd->filename); pstrcpy(bs->backing_format, sizeof(bs->backing_format), -- 1.8.4.2