From nobody Tue Feb 10 17:08:37 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 1502200879812505.1508175731658; Tue, 8 Aug 2017 07:01:19 -0700 (PDT) Received: from localhost ([::1]:42750 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1df54Q-000240-GJ for importer@patchew.org; Tue, 08 Aug 2017 10:01:18 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:42559) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1df52U-0000Ow-F2 for qemu-devel@nongnu.org; Tue, 08 Aug 2017 09:59:23 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1df52P-0002FP-Hl for qemu-devel@nongnu.org; Tue, 08 Aug 2017 09:59:18 -0400 Received: from mx1.redhat.com ([209.132.183.28]:58778) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1df52E-00025g-T4; Tue, 08 Aug 2017 09:59:03 -0400 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id C42E3C049D5C; Tue, 8 Aug 2017 13:59:01 +0000 (UTC) Received: from dhcp-200-186.str.redhat.com (dhcp-200-186.str.redhat.com [10.33.200.186]) by smtp.corp.redhat.com (Postfix) with ESMTP id B76FF5C549; Tue, 8 Aug 2017 13:59:00 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com C42E3C049D5C Authentication-Results: ext-mx07.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx07.extmail.prod.ext.phx2.redhat.com; spf=fail smtp.mailfrom=kwolf@redhat.com From: Kevin Wolf To: qemu-block@nongnu.org Date: Tue, 8 Aug 2017 15:58:34 +0200 Message-Id: <20170808135838.11525-15-kwolf@redhat.com> In-Reply-To: <20170808135838.11525-1-kwolf@redhat.com> References: <20170808135838.11525-1-kwolf@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.31]); Tue, 08 Aug 2017 13:59:01 +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] [PULL 14/18] block: Allow reopen rw without BDRV_O_ALLOW_RDWR 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, peter.maydell@linaro.org, qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" BDRV_O_ALLOW_RDWR is a flag that tells whether qemu can internally reopen a node read-write temporarily because the user requested read-write for the top-level image, but qemu decided that read-only is enough for this node (a backing file). bdrv_reopen() is different, it is also used for cases where the user changed their mind and wants to update the options. There is no reason to forbid making a node read-write in that case. Signed-off-by: Kevin Wolf Reviewed-by: Eric Blake Reviewed-by: Jeff Cody Reviewed-by: John Snow --- include/block/block.h | 3 ++- block.c | 11 +++++++---- 2 files changed, 9 insertions(+), 5 deletions(-) diff --git a/include/block/block.h b/include/block/block.h index 34770bb33a..ab80195378 100644 --- a/include/block/block.h +++ b/include/block/block.h @@ -436,7 +436,8 @@ int bdrv_is_allocated_above(BlockDriverState *top, Bloc= kDriverState *base, =20 bool bdrv_is_read_only(BlockDriverState *bs); bool bdrv_is_writable(BlockDriverState *bs); -int bdrv_can_set_read_only(BlockDriverState *bs, bool read_only, Error **e= rrp); +int bdrv_can_set_read_only(BlockDriverState *bs, bool read_only, + bool ignore_allow_rdw, 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); diff --git a/block.c b/block.c index ab908cdc50..2711c3dd3b 100644 --- a/block.c +++ b/block.c @@ -246,7 +246,8 @@ bool bdrv_is_writable(BlockDriverState *bs) return !bdrv_is_read_only(bs) && !(bs->open_flags & BDRV_O_INACTIVE); } =20 -int bdrv_can_set_read_only(BlockDriverState *bs, bool read_only, Error **e= rrp) +int bdrv_can_set_read_only(BlockDriverState *bs, bool read_only, + bool ignore_allow_rdw, Error **errp) { /* Do not set read_only if copy_on_read is enabled */ if (bs->copy_on_read && read_only) { @@ -256,7 +257,9 @@ int bdrv_can_set_read_only(BlockDriverState *bs, bool r= ead_only, Error **errp) } =20 /* Do not clear read_only if it is prohibited */ - if (!read_only && !(bs->open_flags & BDRV_O_ALLOW_RDWR)) { + if (!read_only && !(bs->open_flags & BDRV_O_ALLOW_RDWR) && + !ignore_allow_rdw) + { error_setg(errp, "Node '%s' is read only", bdrv_get_device_or_node_name(bs)); return -EPERM; @@ -269,7 +272,7 @@ int bdrv_set_read_only(BlockDriverState *bs, bool read_= only, Error **errp) { int ret =3D 0; =20 - ret =3D bdrv_can_set_read_only(bs, read_only, errp); + ret =3D bdrv_can_set_read_only(bs, read_only, false, errp); if (ret < 0) { return ret; } @@ -2907,7 +2910,7 @@ int bdrv_reopen_prepare(BDRVReopenState *reopen_state= , BlockReopenQueue *queue, * to r/w. Attempting to set to r/w may fail if either BDRV_O_ALLOW_RD= WR is * not set, or if the BDS still has copy_on_read enabled */ read_only =3D !(reopen_state->flags & BDRV_O_RDWR); - ret =3D bdrv_can_set_read_only(reopen_state->bs, read_only, &local_err= ); + ret =3D bdrv_can_set_read_only(reopen_state->bs, read_only, true, &loc= al_err); if (local_err) { error_propagate(errp, local_err); goto error; --=20 2.13.4