From patchwork Fri Sep 20 15:27:47 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Max Reitz X-Patchwork-Id: 11154581 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 66A151745 for ; Fri, 20 Sep 2019 15:38:06 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 4682520882 for ; Fri, 20 Sep 2019 15:38:06 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4682520882 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Received: from localhost ([::1]:60960 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iBKyy-0008AF-CV for patchwork-qemu-devel@patchwork.kernel.org; Fri, 20 Sep 2019 11:38:04 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:43861) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iBKpe-0000gB-Re for qemu-devel@nongnu.org; Fri, 20 Sep 2019 11:28:27 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1iBKpc-0004Pt-OG for qemu-devel@nongnu.org; Fri, 20 Sep 2019 11:28:26 -0400 Received: from mx1.redhat.com ([209.132.183.28]:41990) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1iBKpY-0004M5-D5; Fri, 20 Sep 2019 11:28:20 -0400 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 47D68C058CBD; Fri, 20 Sep 2019 15:28:18 +0000 (UTC) Received: from localhost (unknown [10.40.205.102]) by smtp.corp.redhat.com (Postfix) with ESMTPS id D444B60167; Fri, 20 Sep 2019 15:28:17 +0000 (UTC) From: Max Reitz To: qemu-block@nongnu.org Subject: [PATCH 05/22] quorum: Fix child permissions Date: Fri, 20 Sep 2019 17:27:47 +0200 Message-Id: <20190920152804.12875-6-mreitz@redhat.com> In-Reply-To: <20190920152804.12875-1-mreitz@redhat.com> References: <20190920152804.12875-1-mreitz@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.32]); Fri, 20 Sep 2019 15:28:18 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kevin Wolf , Alberto Garcia , qemu-devel@nongnu.org, Max Reitz Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" Quorum is not actually a filter. It cannot share WRITE or RESIZE on its children. Signed-off-by: Max Reitz Reviewed-by: Vladimir Sementsov-Ogievskiy --- block/quorum.c | 19 ++++++++++++++++++- 1 file changed, 18 insertions(+), 1 deletion(-) diff --git a/block/quorum.c b/block/quorum.c index df68adcfaa..17b439056f 100644 --- a/block/quorum.c +++ b/block/quorum.c @@ -1114,6 +1114,23 @@ static char *quorum_dirname(BlockDriverState *bs, Error **errp) return NULL; } +static void quorum_child_perm(BlockDriverState *bs, BdrvChild *c, + const BdrvChildRole *role, + BlockReopenQueue *reopen_queue, + uint64_t perm, uint64_t shared, + uint64_t *nperm, uint64_t *nshared) +{ + *nperm = perm & DEFAULT_PERM_PASSTHROUGH; + + /* + * We cannot share RESIZE or WRITE, as this would make the + * children differ from each other. + */ + *nshared = (shared & (BLK_PERM_CONSISTENT_READ | + BLK_PERM_WRITE_UNCHANGED)) + | DEFAULT_PERM_UNCHANGED; +} + static const char *const quorum_strong_runtime_opts[] = { QUORUM_OPT_VOTE_THRESHOLD, QUORUM_OPT_BLKVERIFY, @@ -1143,7 +1160,7 @@ static BlockDriver bdrv_quorum = { .bdrv_add_child = quorum_add_child, .bdrv_del_child = quorum_del_child, - .bdrv_child_perm = bdrv_filter_default_perms, + .bdrv_child_perm = quorum_child_perm, .is_filter = true, .bdrv_recurse_is_first_non_filter = quorum_recurse_is_first_non_filter,