From nobody Tue Feb 10 02:43:37 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.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 1492595315129375.6117840252771; Wed, 19 Apr 2017 02:48:35 -0700 (PDT) Received: from localhost ([::1]:46720 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1d0mDv-0007D9-N6 for importer@patchew.org; Wed, 19 Apr 2017 05:48:31 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:52259) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1d0m9p-0003rj-At for qemu-devel@nongnu.org; Wed, 19 Apr 2017 05:44:18 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1d0m9m-0005C3-8R for qemu-devel@nongnu.org; Wed, 19 Apr 2017 05:44:17 -0400 Received: from mx1.redhat.com ([209.132.183.28]:46772) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1d0m9k-000596-4x; Wed, 19 Apr 2017 05:44:12 -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 11CED8B976; Wed, 19 Apr 2017 09:44:11 +0000 (UTC) Received: from lemon.redhat.com (ovpn-8-64.pek2.redhat.com [10.72.8.64]) by smtp.corp.redhat.com (Postfix) with ESMTP id C9BC5C90BD; Wed, 19 Apr 2017 09:44:08 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com 11CED8B976 Authentication-Results: ext-mx03.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx03.extmail.prod.ext.phx2.redhat.com; spf=pass smtp.mailfrom=famz@redhat.com DKIM-Filter: OpenDKIM Filter v2.11.0 mx1.redhat.com 11CED8B976 From: Fam Zheng To: qemu-devel@nongnu.org Date: Wed, 19 Apr 2017 17:43:42 +0800 Message-Id: <20170419094356.19826-3-famz@redhat.com> In-Reply-To: <20170419094356.19826-1-famz@redhat.com> References: <20170419094356.19826-1-famz@redhat.com> 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 [10.5.110.27]); Wed, 19 Apr 2017 09:44:11 +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 v2 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 , 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 7405024..6bdd9ce 100644 --- a/block/block-backend.c +++ b/block/block-backend.c @@ -629,6 +629,18 @@ void blk_resume_after_migration(Error **errp) } } =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 7462228..537f92f 100644 --- a/include/sysemu/block-backend.h +++ b/include/sysemu/block-backend.h @@ -116,6 +116,7 @@ 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