From nobody Mon Feb 9 23:01:40 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.zoho.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 1490066313780209.98744489099386; Mon, 20 Mar 2017 20:18:33 -0700 (PDT) Received: from localhost ([::1]:36391 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cqAJc-0001aq-CS for importer@patchew.org; Mon, 20 Mar 2017 23:18:32 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:39444) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cqAIJ-0001UJ-JN for qemu-devel@nongnu.org; Mon, 20 Mar 2017 23:17:12 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1cqAII-0000P5-RT for qemu-devel@nongnu.org; Mon, 20 Mar 2017 23:17:11 -0400 Received: from mx1.redhat.com ([209.132.183.28]:43274) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1cqAIE-0000Lg-JD; Mon, 20 Mar 2017 23:17:06 -0400 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id A192281F07; Tue, 21 Mar 2017 03:17:06 +0000 (UTC) Received: from lemon.redhat.com (ovpn-8-61.pek2.redhat.com [10.72.8.61]) by smtp.corp.redhat.com (Postfix) with ESMTP id 187AB9F366; Tue, 21 Mar 2017 03:16:54 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com A192281F07 Authentication-Results: ext-mx01.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx01.extmail.prod.ext.phx2.redhat.com; spf=pass smtp.mailfrom=famz@redhat.com DKIM-Filter: OpenDKIM Filter v2.11.0 mx1.redhat.com A192281F07 From: Fam Zheng To: qemu-devel@nongnu.org Date: Tue, 21 Mar 2017 11:16:21 +0800 Message-Id: <20170321031635.22123-3-famz@redhat.com> In-Reply-To: <20170321031635.22123-1-famz@redhat.com> References: <20170321031635.22123-1-famz@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.25]); Tue, 21 Mar 2017 03:17:06 +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 RFC 02/16] block-backend: Add blk_request_perm 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: Kevin Wolf , Paolo Bonzini , qemu-block@nongnu.org, Stefan Hajnoczi , Max Reitz 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" This function tries to request, if not granted yet, for the given permissions. Signed-off-by: Fam Zheng --- block/block-backend.c | 12 ++++++++++++ include/sysemu/block-backend.h | 1 + 2 files changed, 13 insertions(+) diff --git a/block/block-backend.c b/block/block-backend.c index 5742c09..5d17404 100644 --- a/block/block-backend.c +++ b/block/block-backend.c @@ -595,6 +595,18 @@ void blk_get_perm(BlockBackend *blk, uint64_t *perm, u= int64_t *shared_perm) *shared_perm =3D blk->shared_perm; } =20 +int blk_request_perm(BlockBackend *blk, uint64_t perm, Error **errp) +{ + uint64_t blk_perm, shared_perm; + + blk_get_perm(blk, &blk_perm, &shared_perm); + if ((blk_perm & perm) =3D=3D perm) { + return 0; + } + blk_perm |=3D perm; + return blk_set_perm(blk, blk_perm, shared_perm, errp); +} + static int blk_do_attach_dev(BlockBackend *blk, void *dev) { if (blk->dev) { diff --git a/include/sysemu/block-backend.h b/include/sysemu/block-backend.h index 096c17f..016632e 100644 --- a/include/sysemu/block-backend.h +++ b/include/sysemu/block-backend.h @@ -108,6 +108,7 @@ bool bdrv_is_root_node(BlockDriverState *bs); int blk_set_perm(BlockBackend *blk, uint64_t perm, uint64_t shared_perm, Error **errp); void blk_get_perm(BlockBackend *blk, uint64_t *perm, uint64_t *shared_perm= ); +int blk_request_perm(BlockBackend *blk, uint64_t perm, Error **errp); =20 void blk_set_allow_write_beyond_eof(BlockBackend *blk, bool allow); void blk_iostatus_enable(BlockBackend *blk); --=20 2.9.3