From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:57445) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ciRdW-0000Hn-2Z for qemu-devel@nongnu.org; Mon, 27 Feb 2017 15:11:10 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ciRdV-0003eE-AF for qemu-devel@nongnu.org; Mon, 27 Feb 2017 15:11:10 -0500 From: Kevin Wolf Date: Mon, 27 Feb 2017 21:09:29 +0100 Message-Id: <1488226184-9044-29-git-send-email-kwolf@redhat.com> In-Reply-To: <1488226184-9044-1-git-send-email-kwolf@redhat.com> References: <1488226184-9044-1-git-send-email-kwolf@redhat.com> Subject: [Qemu-devel] [PATCH v2 28/43] block: Fix pending requests check in bdrv_append() List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-block@nongnu.org Cc: kwolf@redhat.com, mreitz@redhat.com, jcody@redhat.com, famz@redhat.com, qemu-devel@nongnu.org bdrv_append() cares about isolation of the node that it modifies, but not about activity in some subtree below it. Instead of using the recursive bdrv_requests_pending(), directly check bs->in_flight, which considers only the node in question. Signed-off-by: Kevin Wolf Reviewed-by: Max Reitz --- block.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/block.c b/block.c index 6456917..7926c6c 100644 --- a/block.c +++ b/block.c @@ -2886,8 +2886,8 @@ static void change_parent_backing_link(BlockDriverState *from, */ void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top) { - assert(!bdrv_requests_pending(bs_top)); - assert(!bdrv_requests_pending(bs_new)); + assert(!atomic_read(&bs_top->in_flight)); + assert(!atomic_read(&bs_new->in_flight)); bdrv_ref(bs_top); -- 1.8.3.1