From patchwork Wed Apr 5 18:28:47 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeff Cody X-Patchwork-Id: 747440 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3vyvd62TYqz9s8N for ; Thu, 6 Apr 2017 04:34:18 +1000 (AEST) Received: from localhost ([::1]:41840 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cvpl1-0001iq-Ny for incoming@patchwork.ozlabs.org; Wed, 05 Apr 2017 14:34:15 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:34197) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cvpgP-0006oa-KN for qemu-devel@nongnu.org; Wed, 05 Apr 2017 14:29:30 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1cvpgO-0002DL-MT for qemu-devel@nongnu.org; Wed, 05 Apr 2017 14:29:29 -0400 Received: from mx1.redhat.com ([209.132.183.28]:38404) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1cvpgI-0002BU-7Z; Wed, 05 Apr 2017 14:29:22 -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 29506C054912; Wed, 5 Apr 2017 18:29:21 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com 29506C054912 Authentication-Results: ext-mx08.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx08.extmail.prod.ext.phx2.redhat.com; spf=pass smtp.mailfrom=jcody@redhat.com DKIM-Filter: OpenDKIM Filter v2.11.0 mx1.redhat.com 29506C054912 Received: from localhost (ovpn-116-76.phx2.redhat.com [10.3.116.76]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 6D8277DB2A; Wed, 5 Apr 2017 18:29:13 +0000 (UTC) From: Jeff Cody To: qemu-devel@nongnu.org Date: Wed, 5 Apr 2017 14:28:47 -0400 Message-Id: <1eeddeba3dc5775183bd1e44ecae616c233b932d.1491416061.git.jcody@redhat.com> In-Reply-To: References: In-Reply-To: References: 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]); Wed, 05 Apr 2017 18:29:21 +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 for-2.10 5/9] block: introduce bdrv_try_set_read_only() 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, jsnow@redhat.com, stefanha@redhat.com, qemu-block@nongnu.org Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Introduce try function for setting read_only flags. Will return < 0 on error, with appropriate Error value set. Does not alter any flags. Signed-off-by: Jeff Cody --- block.c | 14 +++++++++++++- include/block/block.h | 1 + 2 files changed, 14 insertions(+), 1 deletion(-) diff --git a/block.c b/block.c index 8bfe7f4..ad958b9 100644 --- a/block.c +++ b/block.c @@ -197,7 +197,7 @@ bool bdrv_is_read_only(BlockDriverState *bs) return bs->read_only; } -int bdrv_set_read_only(BlockDriverState *bs, bool read_only, Error **errp) +int bdrv_try_set_read_only(BlockDriverState *bs, bool read_only, Error **errp) { /* Do not set read_only if copy_on_read is enabled */ if (bs->copy_on_read && read_only) { @@ -213,6 +213,18 @@ int bdrv_set_read_only(BlockDriverState *bs, bool read_only, Error **errp) return -EPERM; } + return 0; +} + +int bdrv_set_read_only(BlockDriverState *bs, bool read_only, Error **errp) +{ + int ret = 0; + + ret = bdrv_try_set_read_only(bs, read_only, errp); + if (ret < 0) { + return ret; + } + bs->read_only = read_only; return 0; } diff --git a/include/block/block.h b/include/block/block.h index beb563a..0049b57 100644 --- a/include/block/block.h +++ b/include/block/block.h @@ -426,6 +426,7 @@ int bdrv_is_allocated_above(BlockDriverState *top, BlockDriverState *base, int64_t sector_num, int nb_sectors, int *pnum); bool bdrv_is_read_only(BlockDriverState *bs); +int bdrv_try_set_read_only(BlockDriverState *bs, bool read_only, Error **errp); int bdrv_set_read_only(BlockDriverState *bs, bool read_only, Error **errp); bool bdrv_is_sg(BlockDriverState *bs); bool bdrv_is_inserted(BlockDriverState *bs);