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=-0.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no 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 D2158C433E0 for ; Thu, 9 Jul 2020 13:53:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A5E122074B for ; Thu, 9 Jul 2020 13:53:19 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="AMhB8lMO" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727932AbgGINxP (ORCPT ); Thu, 9 Jul 2020 09:53:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40998 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727850AbgGINxO (ORCPT ); Thu, 9 Jul 2020 09:53:14 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 30B84C08C5CE; Thu, 9 Jul 2020 06:53:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=A/4siLHon92g4IOHLdSOiY5MlPCIQuEMtRpmzy/+J/I=; b=AMhB8lMO9DpZKRSAYhyqyttzvO a/0wM1b8Ov//ozcY3BygrjpbYmqBPNdgi3ZiYAWwL3guA7HmKceFaKhd2qDFCfJ4O1AEcy1yIYhjR oshVp6hIfda+9XXUqf4KXVYTQ2p8TKorY7cEVCFwoSj1TSNEXUaqU5yCJH+ZuyBOiTfJuKT71Ag55 w75JXXYfdkFAwbEuhwq6BFXRjK+RRW+Vbo90lHx7tW9v0tXuynUjPF/67NcvjBugprhv5RvvMIvvo 4ry1lJxFdxY+PC84qOZbLEjWowNY6R2YMZiZUh+Vpjew1tmA1HEez2zSa7nTPp0JTMYaShf4rHOQi u2GZzv2g==; Received: from willy by casper.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1jtWz9-0001fO-J6; Thu, 09 Jul 2020 13:53:11 +0000 Date: Thu, 9 Jul 2020 14:53:11 +0100 From: Matthew Wilcox To: Pavel Begunkov Cc: Christoph Hellwig , Jens Axboe , linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-aio@kvack.org, io-uring@vger.kernel.org, linux-kernel@vger.kernel.org, Kanchan Joshi , Javier Gonzalez Subject: Re: [PATCH 0/2] Remove kiocb ki_complete Message-ID: <20200709135311.GE12769@casper.infradead.org> References: <20200708222637.23046-1-willy@infradead.org> <20200709101705.GA2095@infradead.org> <20200709111036.GA12769@casper.infradead.org> <20200709132611.GA1382@infradead.org> <20200709134319.GD12769@casper.infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org On Thu, Jul 09, 2020 at 04:49:51PM +0300, Pavel Begunkov wrote: > On 09/07/2020 16:43, Matthew Wilcox wrote: > > On Thu, Jul 09, 2020 at 04:37:59PM +0300, Pavel Begunkov wrote: > >> Kanchan, could you take a look if you can hide it in req->cflags? > > > > No, that's not what cflags are for. And besides, there's only 32 bits > > there. > > It's there to temporarily store cqe->cflags, if a request can't completed > right away. And req->{result,user_data,cflags} are basically an CQE inside > io_kiocb. > > So, it is there exactly for that reason, and whatever way it's going to be > encoded in an CQE, io_kiocb can fit it. That was my point. But it's not going to be encoded in the CQE. Perhaps you should go back to the older thread and read the arguments there.