From patchwork Wed Mar 6 06:16:27 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Asias He X-Patchwork-Id: 2223331 Return-Path: X-Original-To: patchwork-kvm@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork1.kernel.org (Postfix) with ESMTP id 2C5ED40077 for ; Wed, 6 Mar 2013 06:17:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753234Ab3CFGRZ (ORCPT ); Wed, 6 Mar 2013 01:17:25 -0500 Received: from mx1.redhat.com ([209.132.183.28]:16392 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750853Ab3CFGRG (ORCPT ); Wed, 6 Mar 2013 01:17:06 -0500 Received: from int-mx11.intmail.prod.int.phx2.redhat.com (int-mx11.intmail.prod.int.phx2.redhat.com [10.5.11.24]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id r266H381031540 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Wed, 6 Mar 2013 01:17:03 -0500 Received: from hj.localdomain.com ([10.66.4.126]) by int-mx11.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id r266Gqli006130; Wed, 6 Mar 2013 01:17:00 -0500 From: Asias He To: Nicholas Bellinger Cc: Paolo Bonzini , Stefan Hajnoczi , "Michael S. Tsirkin" , Rusty Russell , kvm@vger.kernel.org, virtualization@lists.linux-foundation.org, target-devel@vger.kernel.org, Asias He Subject: [PATCH 2/5] tcm_vhost: Introduce tcm_vhost_check_feature() Date: Wed, 6 Mar 2013 14:16:27 +0800 Message-Id: <1362550590-3534-3-git-send-email-asias@redhat.com> In-Reply-To: <1362550590-3534-1-git-send-email-asias@redhat.com> References: <1362550590-3534-1-git-send-email-asias@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.24 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org This helper is useful to check if a feature is supported. Signed-off-by: Asias He --- drivers/vhost/tcm_vhost.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/drivers/vhost/tcm_vhost.c b/drivers/vhost/tcm_vhost.c index b3e50d7..fdbf986 100644 --- a/drivers/vhost/tcm_vhost.c +++ b/drivers/vhost/tcm_vhost.c @@ -91,6 +91,20 @@ static int iov_num_pages(struct iovec *iov) ((unsigned long)iov->iov_base & PAGE_MASK)) >> PAGE_SHIFT; } +static bool tcm_vhost_check_feature(struct vhost_scsi *vs, u64 feature) +{ + u64 acked_features; + bool ret = false; + + mutex_lock(&vs->dev.mutex); + acked_features = vs->dev.acked_features; + if (acked_features & 1ULL << feature) + ret = true; + mutex_unlock(&vs->dev.mutex); + + return ret; +} + static int tcm_vhost_check_true(struct se_portal_group *se_tpg) { return 1;