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=-3.9 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,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 AD1D1C433E7 for ; Thu, 15 Oct 2020 19:03:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 180D022203 for ; Thu, 15 Oct 2020 19:03:19 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="NX+4sGxW" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2391405AbgJOTDQ (ORCPT ); Thu, 15 Oct 2020 15:03:16 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43304 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729674AbgJOTDP (ORCPT ); Thu, 15 Oct 2020 15:03:15 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8F31BC061755; Thu, 15 Oct 2020 12:03:15 -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=oNJXIe6ApwnR4LV/FIl4/BNaWNi8NSTj4mgOrmFnzuk=; b=NX+4sGxWbcObdfGwkGyOjAO42I RwmquKATXBHbPE8QSMBRvqg3SOeDdcTChlMCCwoXnLis0DLRnkhZ9SBCeMdxlmrOEU5T31XnSKdna 8BJnB9a8evpDeuTlBno2NyNtBFQ3rhK5+DQAIo0aSwxVOlbPXbe1xBNJP+/BLP07zrDu8t86RMeAH /PjljktE1B37EED9rYHkhPumMrgN299CGCffnkM19ZidMR2ViOe3nCfbLb380F9gIBfoc1CJNWBEM pVilSrRr9k6B9lRS2zCnqwquGo2pBX6mLt0eMBFVmNSqr+ihKMHE6zdFkrlbS40ju3J1wa+nt0m9O xHvnTZKg==; Received: from willy by casper.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1kT8Wu-00055X-Dw; Thu, 15 Oct 2020 19:03:12 +0000 Date: Thu, 15 Oct 2020 20:03:12 +0100 From: Matthew Wilcox To: Christoph Hellwig Cc: linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, v9fs-developer@lists.sourceforge.net, linux-kernel@vger.kernel.org, linux-afs@lists.infradead.org, ceph-devel@vger.kernel.org, linux-cifs@vger.kernel.org, ecryptfs@vger.kernel.org, linux-um@lists.infradead.org, linux-mtd@lists.infradead.org, Richard Weinberger , linux-xfs@vger.kernel.org Subject: Re: [PATCH v2 16/16] iomap: Make readpage synchronous Message-ID: <20201015190312.GB20115@casper.infradead.org> References: <20201009143104.22673-1-willy@infradead.org> <20201009143104.22673-17-willy@infradead.org> <20201015094203.GA21420@infradead.org> <20201015164333.GA20115@casper.infradead.org> <20201015175848.GA4145@infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20201015175848.GA4145@infradead.org> Precedence: bulk List-ID: X-Mailing-List: linux-xfs@vger.kernel.org On Thu, Oct 15, 2020 at 06:58:48PM +0100, Christoph Hellwig wrote: > On Thu, Oct 15, 2020 at 05:43:33PM +0100, Matthew Wilcox wrote: > > I prefer assigning ctx conditionally to propagating the knowledge > > that !rac means synchronous. I've gone with this: > > And I really hate these kinds of conditional assignments. If the > ->rac check is too raw please just add an explicit > > bool synchronous : 1; > > flag. I honestly don't see the problem. We have to assign the status conditionally anyway so we don't overwrite an error with a subsequent success. > True. I'd still prefer the AOP_UPDATED_PAGE as the fallthrough case > and an explicit goto out_unlock, though. So this? if (ctx.bio) { submit_bio(ctx.bio); wait_for_completion(&ctx.done); if (ret < 0) goto err; ret = blk_status_to_errno(ctx.status); } if (ret < 0) goto err; return AOP_UPDATED_PAGE; err: unlock_page(page); return ret;