Received: by 2002:a25:b323:0:0:0:0:0 with SMTP id l35csp3074765ybj; Mon, 23 Sep 2019 14:21:35 -0700 (PDT) X-Google-Smtp-Source: APXvYqwfU8YLW6ET74jdEGGY0LERpyPBufheIAGRvuALmUroYxvQDj+5LZwt5iAB/lZwF7armPkk X-Received: by 2002:a17:906:4ad2:: with SMTP id u18mr1601088ejt.117.1569273695039; Mon, 23 Sep 2019 14:21:35 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1569273695; cv=none; d=google.com; s=arc-20160816; b=bW1Dod4mmsFc8QLX9YWQ0oImNgm7CoXH2Mhz7kKKXOB3T4BEgivfTIWEOPhDSqmKlw v6EdSn/umDmjnepoT07LugDA7tHbYKbUvXrVM7GBtYqv/K/sSoq4Swhdg5mXJNBrxXGv y9D1oG4WmbUt8Qpw+7tbsHhQMuP05jU/FU4Kbt2fOUL+YrtBszcCRw7+SglKvKzYTte5 Prrqm4DSqP7la/mzhOavuYydg+sLi9SC/ZHODneI37z0cnkEJ3wuZ6Vx38gBOfvQP9Ir MFrI8Q6TltbGnfIXNOfbM9Ac+MO9IcCuPlCpZRIPDQm7E57tEY5qsMa8z03Y73rDp7Ws l/+A== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=XTG3znjicaI26A6XSs4uKh2CrY6FhY7Lp7Yycs3ATr0=; b=W58hj8dyGzetx3rJA6nRYuceuhSTFquKNngB44LkUPeNiTV3i9k+pQig4IbxBS3rHb 6QrQ/rE4EawX6MqgpyJRB+VcSXFcoiX3EK7HkfKpXDatZbjALt9JM1iAS5wvoDOKqYJE UL7Wle2aWXdoGC6BrmKVY+sanbkbLh3t5lV2dJBms6VY6CJJdQFxKsEAEvtofoFLHbb2 6M+lYImKmwD7/AZ+w+CDHlj8YW3k/buUpcbaOZ7XPuOOf4a+yXjAUrbXMVDjiTQhVUKW c25ZDVEryyOt6FlKrzzVzRQ6O5/kW/i8GSrfKuTPouP7KxnLGeCxQRn6L/gHZrpJHHAl aTKQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@kernel.org header.s=default header.b=H0SbaxB2; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id h2si7575727edb.346.2019.09.23.14.21.10; Mon, 23 Sep 2019 14:21:35 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=default header.b=H0SbaxB2; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388934AbfIVSp5 (ORCPT + 99 others); Sun, 22 Sep 2019 14:45:57 -0400 Received: from mail.kernel.org ([198.145.29.99]:41720 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389638AbfIVSpx (ORCPT ); Sun, 22 Sep 2019 14:45:53 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id CA9D7206C2; Sun, 22 Sep 2019 18:45:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1569177953; bh=nLBmpST4CMAjbXYt20w4xU7PrLmWj0RW/y6RZSzDzaA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=H0SbaxB2PIw6cjJsgboXFiuS2P9Bcz/E1jnj34dsr2rErVR3R5X3rqbqpchBDXCv2 CW3nUfvQ9JKY+7dQzwuI1bxb4SBRl8sVwnJT3CyyGbd+5Sd4kQ80kcpYz/WM7MDfi8 AIjFqbx8PskmT1MRAiYNuyQk7qB4H1UNLuIEoYGE= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Alessio Balsini , Jens Axboe , Sasha Levin , linux-block@vger.kernel.org Subject: [PATCH AUTOSEL 5.3 059/203] loop: Add LOOP_SET_DIRECT_IO to compat ioctl Date: Sun, 22 Sep 2019 14:41:25 -0400 Message-Id: <20190922184350.30563-59-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190922184350.30563-1-sashal@kernel.org> References: <20190922184350.30563-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore 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 ab7ca5989097a..1410fa8936538 100644 --- a/drivers/block/loop.c +++ b/drivers/block/loop.c @@ -1755,6 +1755,7 @@ 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