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=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,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 D9A97C10F14 for ; Thu, 3 Oct 2019 16:17:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A75BA20865 for ; Thu, 3 Oct 2019 16:17:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1570119437; bh=qv9ygTfvEiKSBYql2/cnEalR9CuEm7hiXBuwEhcKLyI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=bZHNx8V4AGz444yG4C8ASPJw+f+nASXONq4IQdvuqvfKY6qHKsn4bq78oJW2GTRS8 oMJ6eHMJ4VO36Cjmmtqz4wvBBwe51spCIcQcGTNOFLoeRRsVjSfvn4ZiXbMGLXp0nO tWH3rK7xF9dtRDjVz9Oi3dR+Zqg+rDPRf/FWhwEo= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389201AbfJCQRP (ORCPT ); Thu, 3 Oct 2019 12:17:15 -0400 Received: from mail.kernel.org ([198.145.29.99]:42672 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389171AbfJCQRJ (ORCPT ); Thu, 3 Oct 2019 12:17:09 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 189CB20865; Thu, 3 Oct 2019 16:17:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1570119428; bh=qv9ygTfvEiKSBYql2/cnEalR9CuEm7hiXBuwEhcKLyI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=TvHc88VYQMPY2SdiL9nVJQdwQRQeQFwTe1esTj100DTlim+HCjbqk9gv1DhijsRtJ /TZdBpBugbnK8fGpWGObRdu8h+yDNKusdc6+8txz8EDb0oVYse0SkO9dgs3qET3wi2 m30iTXNQ7wTN6rW6rEgl1k6qwrexuduCcBkW1HQw= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jens Axboe , Alessio Balsini , Sasha Levin Subject: [PATCH 4.19 060/211] loop: Add LOOP_SET_DIRECT_IO to compat ioctl Date: Thu, 3 Oct 2019 17:52:06 +0200 Message-Id: <20191003154502.001730641@linuxfoundation.org> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191003154447.010950442@linuxfoundation.org> References: <20191003154447.010950442@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Alessio Balsini [ Upstream commit fdbe4eeeb1aac219b14f10c0ed31ae5d1123e9b8 ] Enabling Direct I/O with loop devices helps reducing memory usage by avoiding double caching. 32 bit applications running on 64 bits systems are currently not able to request direct I/O because is missing from the lo_compat_ioctl. This patch fixes the compatibility issue mentioned above by exporting LOOP_SET_DIRECT_IO as additional lo_compat_ioctl() entry. The input argument for this ioctl is a single long converted to a 1-bit boolean, so compatibility is preserved. Cc: Jens Axboe Signed-off-by: Alessio Balsini Signed-off-by: Jens Axboe Signed-off-by: Sasha Levin --- drivers/block/loop.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/block/loop.c b/drivers/block/loop.c index cef8e00c9d9d6..126c2c5146732 100644 --- a/drivers/block/loop.c +++ b/drivers/block/loop.c @@ -1719,6 +1719,7 @@ static int lo_compat_ioctl(struct block_device *bdev, fmode_t mode, case LOOP_SET_FD: case LOOP_CHANGE_FD: case LOOP_SET_BLOCK_SIZE: + case LOOP_SET_DIRECT_IO: err = lo_ioctl(bdev, mode, cmd, arg); break; default: -- 2.20.1