From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3C7D8C32771 for ; Mon, 6 Jan 2020 07:42:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0FA79215A4 for ; Mon, 6 Jan 2020 07:42:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725817AbgAFHma (ORCPT ); Mon, 6 Jan 2020 02:42:30 -0500 Received: from mail.cn.fujitsu.com ([183.91.158.132]:52447 "EHLO heian.cn.fujitsu.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1725446AbgAFHma (ORCPT ); Mon, 6 Jan 2020 02:42:30 -0500 X-IronPort-AV: E=Sophos;i="5.69,401,1571673600"; d="scan'208";a="81361754" Received: from unknown (HELO cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 06 Jan 2020 15:42:28 +0800 Received: from G08CNEXMBPEKD05.g08.fujitsu.local (unknown [10.167.33.204]) by cn.fujitsu.com (Postfix) with ESMTP id D74AB49E9326; Mon, 6 Jan 2020 15:33:29 +0800 (CST) Received: from G08CNEXCHPEKD02.g08.fujitsu.local (10.167.33.83) by G08CNEXMBPEKD05.g08.fujitsu.local (10.167.33.204) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Mon, 6 Jan 2020 15:42:29 +0800 Received: from localhost.localdomain (10.167.220.84) by G08CNEXCHPEKD02.g08.fujitsu.local (10.167.33.89) with Microsoft SMTP Server (TLS) id 14.3.439.0; Mon, 6 Jan 2020 15:42:26 +0800 From: Yang Xu To: CC: , Yang Xu Subject: [PATCH v1 1/2] loop.4: Document LOOP_SET_DIRECT_IO Date: Mon, 6 Jan 2020 15:42:22 +0800 Message-ID: <1578296543-4195-1-git-send-email-xuyang2018.jy@cn.fujitsu.com> X-Mailer: git-send-email 1.8.3.1 MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.167.220.84] X-yoursite-MailScanner-ID: D74AB49E9326.AE2AB X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: xuyang2018.jy@cn.fujitsu.com Sender: linux-man-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-man@vger.kernel.org Signed-off-by: Yang Xu --- man4/loop.4 | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/man4/loop.4 b/man4/loop.4 index a56586fe6..afb1d05c5 100644 --- a/man4/loop.4 +++ b/man4/loop.4 @@ -152,6 +152,13 @@ Resize a live loop device. One can change the size of the underlying backing store and then use this operation so that the loop driver learns about the new size. This operation takes no argument. +.TP +.BR LOOP_SET_DIRECT_IO " (since Linux 4.10)" +.\" commit ab1cb278bc7027663adbfb0b81404f8398437e11 +Set DIRECT IO mode on the loop device. So it can be used to open backing +file. The (third) +.BR ioctl(2) +argument is an unsigned long value. non-zero represents direct IO mode. .PP Since Linux 2.6, there are two new .BR ioctl (2) -- 2.18.0