From nobody Mon Nov 10 19:26:21 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; 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 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1558104926; cv=none; d=zoho.com; s=zohoarc; b=FOq9bo++gumJ9SIEmWBEpjgKLQ55eQXtMjwnw94aldcqPbD55vYswyiMBnvs7xq2O4uO8BkpFR8VilkO53LPdss6pXL7aN2IiJbcW2U/2izlnpSLuimzOXbS54N0Djy3BGbqu9wdIztcRwGI5PDktZw2knNdRqffByeKEY4tbIw= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zoho.com; s=zohoarc; t=1558104926; h=Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To:ARC-Authentication-Results; bh=i55ePKJZ2v4fLk0aQVY377Bh/YscU/StMkOtuAnSRJI=; b=NmW5slAZ1zDZ9y/J7HTvWx46uXrjWx5muq3jjQlIwKm4JsPCqzPqFdwB/1PtVGULpEJl2vALntA4JQrsgpvjqaJTcICs0aA4xm7uqDOtfYGz9euHkYWfXLDK4731TxIeusW7QGbQQTOjfu5e4UFPe1nByrAiQGYSxMlTUzCx7Jw= ARC-Authentication-Results: i=1; mx.zoho.com; spf=pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail header.from= (p=none dis=none) header.from= Return-Path: Received: from lists.gnu.org (209.51.188.17 [209.51.188.17]) by mx.zohomail.com with SMTPS id 1558104926042426.8098743242449; Fri, 17 May 2019 07:55:26 -0700 (PDT) Received: from localhost ([127.0.0.1]:49805 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hReGV-0002UK-W2 for importer@patchew.org; Fri, 17 May 2019 10:55:20 -0400 Received: from eggs.gnu.org ([209.51.188.92]:45856) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hRe4p-0001xH-V8 for qemu-devel@nongnu.org; Fri, 17 May 2019 10:43:16 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hRe4n-0004Ba-It for qemu-devel@nongnu.org; Fri, 17 May 2019 10:43:15 -0400 Received: from mx1.redhat.com ([209.132.183.28]:32227) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hRe4h-00045L-3h; Fri, 17 May 2019 10:43:07 -0400 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 1F77A7FDFC; Fri, 17 May 2019 14:42:59 +0000 (UTC) Received: from localhost.localdomain.com (ovpn-116-213.ams2.redhat.com [10.36.116.213]) by smtp.corp.redhat.com (Postfix) with ESMTP id B1BC061F21; Fri, 17 May 2019 14:42:56 +0000 (UTC) From: Kevin Wolf To: qemu-block@nongnu.org Date: Fri, 17 May 2019 16:42:32 +0200 Message-Id: <20190517144232.18965-7-kwolf@redhat.com> In-Reply-To: <20190517144232.18965-1-kwolf@redhat.com> References: <20190517144232.18965-1-kwolf@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.27]); Fri, 17 May 2019 14:43:01 +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] [PATCH v2 6/6] file-posix: Add dynamic-auto-read-only QAPI feature 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, pkrempa@redhat.com, armbru@redhat.com, qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Type: text/plain; charset="utf-8" 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 --- 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 7ccbfff9d0..e820e7dfb0 100644 --- a/qapi/block-core.json +++ b/qapi/block-core.json @@ -2843,6 +2843,15 @@ # 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 t= he +# driver will open the image read-only at first, +# dynamically reopen the image file read-write wh= en +# the first writer is attached to the node and re= open +# read-only when the last writer is detached. This +# allows to give QEMU write permissions only on d= emand +# when an operation actually needs write access. +# # Since: 2.9 ## { 'struct': 'BlockdevOptionsFile', @@ -2852,7 +2861,9 @@ '*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 2.20.1