From patchwork Tue Feb 28 12:53:55 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kevin Wolf X-Patchwork-Id: 9595633 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 0DFF160429 for ; Tue, 28 Feb 2017 13:39:11 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id ECC22284D0 for ; Tue, 28 Feb 2017 13:39:10 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id DF5CB28524; Tue, 28 Feb 2017 13:39:10 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 88EE7284D0 for ; Tue, 28 Feb 2017 13:39:10 +0000 (UTC) Received: from localhost ([::1]:32843 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cihzh-0002ym-KE for patchwork-qemu-devel@patchwork.kernel.org; Tue, 28 Feb 2017 08:39:09 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:43266) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cihIx-00044C-UE for qemu-devel@nongnu.org; Tue, 28 Feb 2017 07:55:00 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1cihIx-00042k-92 for qemu-devel@nongnu.org; Tue, 28 Feb 2017 07:55:00 -0500 Received: from mx1.redhat.com ([209.132.183.28]:54938) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1cihIs-000413-So; Tue, 28 Feb 2017 07:54:54 -0500 Received: from int-mx10.intmail.prod.int.phx2.redhat.com (int-mx10.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 04075C057FA9; Tue, 28 Feb 2017 12:54:55 +0000 (UTC) Received: from noname.redhat.com (ovpn-116-177.ams2.redhat.com [10.36.116.177]) by int-mx10.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id v1SCsXQC029713; Tue, 28 Feb 2017 07:54:53 -0500 From: Kevin Wolf To: qemu-block@nongnu.org Date: Tue, 28 Feb 2017 13:53:55 +0100 Message-Id: <1488286469-9381-11-git-send-email-kwolf@redhat.com> In-Reply-To: <1488286469-9381-1-git-send-email-kwolf@redhat.com> References: <1488286469-9381-1-git-send-email-kwolf@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.23 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.32]); Tue, 28 Feb 2017 12:54:55 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH v3 10/44] block: Require .bdrv_child_perm() with child nodes X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kwolf@redhat.com, jcody@redhat.com, famz@redhat.com, qemu-devel@nongnu.org, mreitz@redhat.com Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP All block drivers that can have child nodes implement .bdrv_child_perm() now. Make this officially a requirement by asserting that only drivers without children can omit .bdrv_child_perm(). Signed-off-by: Kevin Wolf Reviewed-by: Max Reitz --- block.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/block.c b/block.c index 281ce7b..52c1f28 100644 --- a/block.c +++ b/block.c @@ -1360,8 +1360,9 @@ static int bdrv_check_perm(BlockDriverState *bs, uint64_t cumulative_perms, cumulative_shared_perms, errp); } - /* Drivers may not have .bdrv_child_perm() */ + /* Drivers that never have children can omit .bdrv_child_perm() */ if (!drv->bdrv_child_perm) { + assert(QLIST_EMPTY(&bs->children)); return 0; } @@ -1420,8 +1421,9 @@ static void bdrv_set_perm(BlockDriverState *bs, uint64_t cumulative_perms, drv->bdrv_set_perm(bs, cumulative_perms, cumulative_shared_perms); } - /* Drivers may not have .bdrv_child_perm() */ + /* Drivers that never have children can omit .bdrv_child_perm() */ if (!drv->bdrv_child_perm) { + assert(QLIST_EMPTY(&bs->children)); return; }