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=-5.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_1 autolearn=unavailable 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 47769C34022 for ; Wed, 19 Feb 2020 03:40:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 224BD222D9 for ; Wed, 19 Feb 2020 03:40:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726659AbgBSDkx (ORCPT ); Tue, 18 Feb 2020 22:40:53 -0500 Received: from mail104.syd.optusnet.com.au ([211.29.132.246]:58578 "EHLO mail104.syd.optusnet.com.au" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726403AbgBSDkw (ORCPT ); Tue, 18 Feb 2020 22:40:52 -0500 Received: from dread.disaster.area (pa49-179-138-28.pa.nsw.optusnet.com.au [49.179.138.28]) by mail104.syd.optusnet.com.au (Postfix) with ESMTPS id 6AF067EAE08; Wed, 19 Feb 2020 14:40:49 +1100 (AEDT) Received: from dave by dread.disaster.area with local (Exim 4.92.3) (envelope-from ) id 1j4GEC-0005Ys-55; Wed, 19 Feb 2020 14:40:48 +1100 Date: Wed, 19 Feb 2020 14:40:48 +1100 From: Dave Chinner To: Matthew Wilcox Cc: linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-btrfs@vger.kernel.org, linux-erofs@lists.ozlabs.org, linux-ext4@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, cluster-devel@redhat.com, ocfs2-devel@oss.oracle.com, linux-xfs@vger.kernel.org Subject: Re: [PATCH v6 18/19] iomap: Convert from readpages to readahead Message-ID: <20200219034048.GF10776@dread.disaster.area> References: <20200217184613.19668-1-willy@infradead.org> <20200217184613.19668-32-willy@infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200217184613.19668-32-willy@infradead.org> User-Agent: Mutt/1.10.1 (2018-07-13) X-Optus-CM-Score: 0 X-Optus-CM-Analysis: v=2.3 cv=LYdCFQXi c=1 sm=1 tr=0 a=zAxSp4fFY/GQY8/esVNjqw==:117 a=zAxSp4fFY/GQY8/esVNjqw==:17 a=jpOVt7BSZ2e4Z31A5e1TngXxSK0=:19 a=kj9zAlcOel0A:10 a=l697ptgUJYAA:10 a=JfrnYn6hAAAA:8 a=7-415B0cAAAA:8 a=Q8fKmb9Ql5ESDqtk72oA:9 a=CjuIK1q_8ugA:10 a=1CNFftbPRP8L7MoqJWF3:22 a=biEYGPWJfzWAr4FL6Ov7:22 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Feb 17, 2020 at 10:46:12AM -0800, Matthew Wilcox wrote: > From: "Matthew Wilcox (Oracle)" > > Use the new readahead operation in iomap. Convert XFS and ZoneFS to > use it. > > Signed-off-by: Matthew Wilcox (Oracle) > --- > fs/iomap/buffered-io.c | 91 +++++++++++++++--------------------------- > fs/iomap/trace.h | 2 +- > fs/xfs/xfs_aops.c | 13 +++--- > fs/zonefs/super.c | 7 ++-- > include/linux/iomap.h | 3 +- > 5 files changed, 42 insertions(+), 74 deletions(-) All pretty straight forward... > @@ -416,6 +384,7 @@ iomap_readpages_actor(struct inode *inode, loff_t pos, loff_t length, > break; > done += ret; > if (offset_in_page(pos + done) == 0) { > + readahead_next(ctx->rac); > if (!ctx->cur_page_in_bio) > unlock_page(ctx->cur_page); > put_page(ctx->cur_page); Though now I look at the addition here, this might be better restructured to mention how we handle partial page submission such as: done += ret; /* * Keep working on a partially complete page, otherwise ready * the ctx for the next page to be acted on. */ if (offset_in_page(pos + done)) continue; if (!ctx->cur_page_in_bio) unlock_page(ctx->cur_page); put_page(ctx->cur_page); ctx->cur_page = NULL; readahead_next(ctx->rac); } Cheers, Dave. -- Dave Chinner david@fromorbit.com