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[209.132.180.67]) by mx.google.com with ESMTP id h49si4408807ede.382.2019.10.27.14.39.10; Sun, 27 Oct 2019 14:39:33 -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=Slk8ooWb; 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 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729721AbfJ0Vhj (ORCPT + 99 others); Sun, 27 Oct 2019 17:37:39 -0400 Received: from mail.kernel.org ([198.145.29.99]:50672 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728727AbfJ0VEz (ORCPT ); Sun, 27 Oct 2019 17:04:55 -0400 Received: from localhost (100.50.158.77.rev.sfr.net [77.158.50.100]) (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 B594020B7C; Sun, 27 Oct 2019 21:04:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1572210295; bh=hOfR+rEBOsJ0m1U0SLsPKNZcvvGpmMSP6RiTjbY8qp8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Slk8ooWb1Tnd186AR8kFUKhlcDi963qaPjqdZ+wzSrk4497hfddcWP9WwTuXcN+ZW oUds5waQ5ZQwJ7fQUgSbTU/MZDbs3JznBkLzWTWr448xzTI28RvKEOMuZpDaofMtgn SdtZMuM9YcEyF7YjoIK5z1wFrbXPccpoT+VoYbso= 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 4.9 16/49] loop: Add LOOP_SET_DIRECT_IO to compat ioctl Date: Sun, 27 Oct 2019 22:00:54 +0100 Message-Id: <20191027203131.256664465@linuxfoundation.org> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191027203119.468466356@linuxfoundation.org> References: <20191027203119.468466356@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 9f840d9fdfcb5..f236b7984b946 100644 --- a/drivers/block/loop.c +++ b/drivers/block/loop.c @@ -1546,6 +1546,7 @@ static int lo_compat_ioctl(struct block_device *bdev, fmode_t mode, arg = (unsigned long) compat_ptr(arg); case LOOP_SET_FD: case LOOP_CHANGE_FD: + case LOOP_SET_DIRECT_IO: err = lo_ioctl(bdev, mode, cmd, arg); break; default: -- 2.20.1