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 2F785C32771 for ; Mon, 6 Jan 2020 07:42:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 08DC3215A4 for ; Mon, 6 Jan 2020 07:42:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725887AbgAFHmf (ORCPT ); Mon, 6 Jan 2020 02:42:35 -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 S1725446AbgAFHmf (ORCPT ); Mon, 6 Jan 2020 02:42:35 -0500 X-IronPort-AV: E=Sophos;i="5.69,401,1571673600"; d="scan'208";a="81361765" Received: from unknown (HELO cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 06 Jan 2020 15:42:34 +0800 Received: from G08CNEXMBPEKD04.g08.fujitsu.local (unknown [10.167.33.201]) by cn.fujitsu.com (Postfix) with ESMTP id BD48E4B3ED8D; Mon, 6 Jan 2020 15:33:36 +0800 (CST) Received: from G08CNEXCHPEKD02.g08.fujitsu.local (10.167.33.83) by G08CNEXMBPEKD04.g08.fujitsu.local (10.167.33.201) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Mon, 6 Jan 2020 15:42:35 +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 15:42:32 +0800 From: Yang Xu To: CC: , Yang Xu Subject: [PATCH v1 2/2] loop.4: Document LOOP_SET_BLOCK_SIZE Date: Mon, 6 Jan 2020 15:42:23 +0800 Message-ID: <1578296543-4195-2-git-send-email-xuyang2018.jy@cn.fujitsu.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1578296543-4195-1-git-send-email-xuyang2018.jy@cn.fujitsu.com> References: <1578296543-4195-1-git-send-email-xuyang2018.jy@cn.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.167.220.84] X-yoursite-MailScanner-ID: BD48E4B3ED8D.A274F 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 afb1d05c5..9fd2b3eb4 100644 --- a/man4/loop.4 +++ b/man4/loop.4 @@ -159,6 +159,13 @@ 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. +.TP +.BR LOOP_SET_BLOCK_SIZE " (since Linux 4.14)" +.\" commit 89e4fdecb51cf5535867026274bc97de9480ade5 +Set the block size of the loop device. The (third) +.BR ioctl(2) +argument is an unsigned long value. This value must be 2 to the power of N +and in range [512,pagesize]. Otherwise, it will get EINVAL error. .PP Since Linux 2.6, there are two new .BR ioctl (2) -- 2.18.0