From nobody Sun Feb 8 17:47:44 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 1487692118405791.2777189167822; Tue, 21 Feb 2017 07:48:38 -0800 (PST) Received: from localhost ([::1]:46453 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cgCg8-000453-61 for importer@patchew.org; Tue, 21 Feb 2017 10:48:36 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:42723) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cgBuS-0008Eq-0X for qemu-devel@nongnu.org; Tue, 21 Feb 2017 09:59:20 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1cgBuR-0007qq-76 for qemu-devel@nongnu.org; Tue, 21 Feb 2017 09:59:20 -0500 Received: from mx1.redhat.com ([209.132.183.28]:32846) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1cgBuO-0007p7-Ej; Tue, 21 Feb 2017 09:59:16 -0500 Received: from int-mx13.intmail.prod.int.phx2.redhat.com (int-mx13.intmail.prod.int.phx2.redhat.com [10.5.11.26]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 7D73F8124B; Tue, 21 Feb 2017 14:59:16 +0000 (UTC) Received: from noname.str.redhat.com (dhcp-192-197.str.redhat.com [10.33.192.197]) by int-mx13.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id v1LEwucu030565; Tue, 21 Feb 2017 09:59:15 -0500 From: Kevin Wolf To: qemu-block@nongnu.org Date: Tue, 21 Feb 2017 15:58:08 +0100 Message-Id: <1487689130-30373-13-git-send-email-kwolf@redhat.com> In-Reply-To: <1487689130-30373-1-git-send-email-kwolf@redhat.com> References: <1487689130-30373-1-git-send-email-kwolf@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.26 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.25]); Tue, 21 Feb 2017 14:59:16 +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 12/54] block: Add op blocker permission constants 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, jcody@redhat.com, famz@redhat.com, qemu-devel@nongnu.org, mreitz@redhat.com 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 patch defines the permission categories that will be used by the new op blocker system. Signed-off-by: Kevin Wolf Reviewed-by: Max Reitz --- include/block/block.h | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) diff --git a/include/block/block.h b/include/block/block.h index bde5ebd..ac40c8d 100644 --- a/include/block/block.h +++ b/include/block/block.h @@ -187,6 +187,41 @@ typedef enum BlockOpType { BLOCK_OP_TYPE_MAX, } BlockOpType; =20 +/* Block node permission constants */ +enum { + /** + * A user that has the "permission" of consistent reads is guaranteed = that + * their view of the contents of the block device is complete and + * self-consistent, repesenting the contents of a disk at a specific p= oint. + * + * For most block devices (including their backing files) this is true= , but + * the property cannot be maintained in a few situations like for + * intermediate nodes of a commit block job. + */ + BLK_PERM_CONSISTENT_READ =3D 0x01, + + /** This permission is required to change the visible disk contents. */ + BLK_PERM_WRITE =3D 0x02, + + /** + * This permission (which is weaker than BLK_PERM_WRITE) is both enoug= h and + * required for writes to the block node when the caller promises that + * this visible disk contents doesn't change. + */ + BLK_PERM_WRITE_UNCHANGED =3D 0x04, + + /** This permission is required to change the size of a block node. */ + BLK_PERM_RESIZE =3D 0x08, + + /** + * This permission is required to change the node that this BdrvChild + * points to. + */ + BLK_PERM_GRAPH_MOD =3D 0x10, + + BLK_PERM_ALL =3D 0x1f, +}; + /* disk I/O throttling */ void bdrv_init(void); void bdrv_init_with_whitelist(void); --=20 1.8.3.1