From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B70E7C31E47 for ; Wed, 12 Jun 2019 17:14:52 +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 9450021019 for ; Wed, 12 Jun 2019 17:14:52 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9450021019 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+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:34002 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hb6pn-0000ji-U9 for qemu-devel@archiver.kernel.org; Wed, 12 Jun 2019 13:14:51 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:57973) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hb6Ug-0007UE-2U for qemu-devel@nongnu.org; Wed, 12 Jun 2019 12:53:05 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hb6Ud-0006ck-UY for qemu-devel@nongnu.org; Wed, 12 Jun 2019 12:53:01 -0400 Received: from mx1.redhat.com ([209.132.183.28]:35092) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hb6Ub-0006EB-U1 for qemu-devel@nongnu.org; Wed, 12 Jun 2019 12:52:58 -0400 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id B877D30872D0 for ; Wed, 12 Jun 2019 16:52:32 +0000 (UTC) Received: from blackfin.pond.sub.org (ovpn-116-148.ams2.redhat.com [10.36.116.148]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 871961001B11; Wed, 12 Jun 2019 16:52:32 +0000 (UTC) Received: by blackfin.pond.sub.org (Postfix, from userid 1000) id BF66E1136422; Wed, 12 Jun 2019 18:52:29 +0200 (CEST) From: Markus Armbruster To: qemu-devel@nongnu.org Date: Wed, 12 Jun 2019 18:52:28 +0200 Message-Id: <20190612165229.26976-11-armbru@redhat.com> In-Reply-To: <20190612165229.26976-1-armbru@redhat.com> References: <20190612165229.26976-1-armbru@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.47]); Wed, 12 Jun 2019 16:52:32 +0000 (UTC) Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PULL 10/11] file-posix: Add dynamic-auto-read-only QAPI feature 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 Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: Kevin Wolf In commit 23dece19da4 ('file-posix: Make auto-read-only dynamic') , auto-read-only=3Don changed its behaviour in file-posix for the 4.0 release. This change cannot be detected through the usual mechanisms like schema introspection. Add a new feature flag to the schema to allow libvirt to detect the presence of the new behaviour. Signed-off-by: Kevin Wolf Message-Id: <20190606153803.5278-7-armbru@redhat.com> Reviewed-by: Markus Armbruster [Comment tweaked on Eric Blake's advice] Signed-off-by: Markus Armbruster --- qapi/block-core.json | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/qapi/block-core.json b/qapi/block-core.json index 175ccfe896..fcd054fcb1 100644 --- a/qapi/block-core.json +++ b/qapi/block-core.json @@ -2859,6 +2859,15 @@ # file is large, do not use in production. # (default: off) (since: 3.0) # +# Features: +# @dynamic-auto-read-only: If present, enabled auto-read-only means that= the +# driver will open the image read-only at first= , +# dynamically reopen the image file read-write = when +# the first writer is attached to the node and = reopen +# read-only when the last writer is detached. T= his +# allows giving QEMU write permissions only on = demand +# when an operation actually needs write access= . +# # Since: 2.9 ## { 'struct': 'BlockdevOptionsFile', @@ -2868,7 +2877,9 @@ '*aio': 'BlockdevAioOptions', '*drop-cache': {'type': 'bool', 'if': 'defined(CONFIG_LINUX)'}, - '*x-check-cache-dropped': 'bool' } } + '*x-check-cache-dropped': 'bool' }, + 'features': [ { 'name': 'dynamic-auto-read-only', + 'if': 'defined(CONFIG_POSIX)' } ] } =20 ## # @BlockdevOptionsNull: --=20 2.21.0