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 36965C2D0DB for ; Thu, 30 Jan 2020 21:35:39 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id EDB2120674 for ; Thu, 30 Jan 2020 21:35:38 +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="DAFPPSbZ" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org EDB2120674 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 6A2D86B038B; Thu, 30 Jan 2020 16:35:38 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 653CD6B038C; Thu, 30 Jan 2020 16:35:38 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 568436B038D; Thu, 30 Jan 2020 16:35:38 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0151.hostedemail.com [216.40.44.151]) by kanga.kvack.org (Postfix) with ESMTP id 40EDC6B038B for ; Thu, 30 Jan 2020 16:35:38 -0500 (EST) Received: from smtpin03.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id F302D824805A for ; Thu, 30 Jan 2020 21:35:37 +0000 (UTC) X-FDA: 76435607556.03.prose68_13fd0b8faaa07 X-HE-Tag: prose68_13fd0b8faaa07 X-Filterd-Recvd-Size: 2753 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) by imf45.hostedemail.com (Postfix) with ESMTP for ; Thu, 30 Jan 2020 21:35:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.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:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=lEn2eE0qOiISzFnNdvDGTgaPAAcv7U9pblByr/9zg6c=; b=DAFPPSbZLJzapcIIVHAkTsDui ESwf8hNfGcili9VLWVLlUWojxXG8dmtOkmhpNJMNDfr1NOAf2y/MTKl/wLBm+mj70IAwtT0zMpLUX p0r2w2q62Nzaet7BZIIXus++tM1PqmAFhj/g3rEYYneyJ72JmTx+D4DVz2k+T/qFFULwE+QSKjYJB igA92CNMZvne0oqySDWQBzkBi4yXRxi0SCqmwxb4rD7xsie2n7SOJ/gPBuVBkjZAW+qVS/ijKuYak ihfZadlAQ8kEO2vaM8l9Qz6ZGZyIMVOde4//DQ7V15gpcMX1LQ5axAcp0Nz8ErMhyDQCzyVg8fQsg dbclkQHtg==; Received: from willy by bombadil.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1ixHTJ-0005Mj-9O; Thu, 30 Jan 2020 21:35:33 +0000 Date: Thu, 30 Jan 2020 13:35:33 -0800 From: Matthew Wilcox To: Dave Chinner Cc: linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 11/12] fuse: Convert from readpages to readahead Message-ID: <20200130213533.GN6615@bombadil.infradead.org> References: <20200125013553.24899-1-willy@infradead.org> <20200125013553.24899-12-willy@infradead.org> <20200129010829.GK18610@dread.disaster.area> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200129010829.GK18610@dread.disaster.area> X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Wed, Jan 29, 2020 at 12:08:29PM +1100, Dave Chinner wrote: > On Fri, Jan 24, 2020 at 05:35:52PM -0800, Matthew Wilcox wrote: > > + while (nr_pages--) { > > + struct page *page = readahead_page(mapping, start++); > > + int err = fuse_readpages_fill(&data, page); > > + > > + if (!err) > > + continue; > > + nr_pages++; > > + goto out; > > } > > That's some pretty convoluted logic. Perhaps: > > for (; nr_pages > 0 ; nr_pages--) { > struct page *page = readahead_page(mapping, start++); > > if (fuse_readpages_fill(&data, page)) > goto out; > } I have a bit of an aversion to that style of for loop ... I like this instead: while (nr_pages) { struct page *page = readahead_page(mapping, start++); if (fuse_readpages_fill(&data, page) != 0) goto out; nr_pages--; }