From patchwork Sat Jan 25 01:35:41 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthew Wilcox X-Patchwork-Id: 11351393 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id BEB8A1398 for ; Sat, 25 Jan 2020 01:36:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9DA66208C4 for ; Sat, 25 Jan 2020 01:36:19 +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="u/qkoarH" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729822AbgAYBgA (ORCPT ); Fri, 24 Jan 2020 20:36:00 -0500 Received: from bombadil.infradead.org ([198.137.202.133]:36760 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387678AbgAYBf7 (ORCPT ); Fri, 24 Jan 2020 20:35:59 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Content-Transfer-Encoding: MIME-Version:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To:Content-Type: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=r6GOkDmHzXzhSVqOAD8xlLIM6J6vOicE1/PE/yHNhJg=; b=u/qkoarH8z0iijq33ZVQ9301v 9Rwk5QUWYJuir0JRz2g3gAvmwfEk2dveuO6cp6kOah1H+gU5RcgFpZyz8DOTwcq4u41wsYNesptA0 DXWwxdfd621h81YVmJJ6QyYt9XLzBwRj4Jjxdi+im2s9zwR/Mdkn5Xy9ag9DkFKXzAcHngeQJznAY IH/oeFxaS/lqVzfpSuTithOrftDc8EsfLSUsRuMvpblcWkatJapDh1LX+b0NnrjN3vpcLlh3vxdyB 4FxYQxNjeDWA6ghvaA058mgMgNJpasVgaPd45I3lX1j0F1vfqg5aArs0bf9j0xFTI4zgAeO6rnM94 yjHIU1COw==; Received: from willy by bombadil.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1ivAMd-0006VA-6E; Sat, 25 Jan 2020 01:35:55 +0000 From: Matthew Wilcox To: linux-fsdevel@vger.kernel.org Cc: "Matthew Wilcox (Oracle)" , 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, linux-xfs@vger.kernel.org, cluster-devel@redhat.com, ocfs2-devel@oss.oracle.com Subject: [PATCH 00/12] Change readahead API Date: Fri, 24 Jan 2020 17:35:41 -0800 Message-Id: <20200125013553.24899-1-willy@infradead.org> X-Mailer: git-send-email 2.21.1 MIME-Version: 1.0 Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org From: "Matthew Wilcox (Oracle)" This series adds a readahead address_space operation to eventually replace the readpages operation. The key difference is that pages are added to the page cache as they are allocated (and then looked up by the filesystem) instead of passing them on a list to the readpages operation and having the filesystem add them to the page cache. It's a net reduction in code for each implementation, more efficient than walking a list, and solves the direct-write vs buffered-read problem reported by yu kuai at https://lore.kernel.org/linux-fsdevel/20200116063601.39201-1-yukuai3@huawei.com/ Matthew Wilcox (Oracle) (12): mm: Fix the return type of __do_page_cache_readahead readahead: Ignore return value of ->readpages readahead: Put pages in cache earlier mm: Add readahead address space operation fs: Convert mpage_readpages to mpage_readahead btrfs: Convert from readpages to readahead erofs: Convert uncompressed files from readpages to readahead erofs: Convert compressed files from readpages to readahead ext4: Convert from readpages to readahead f2fs: Convert from readpages to readahead fuse: Convert from readpages to readahead iomap: Convert from readpages to readahead Documentation/filesystems/locking.rst | 7 ++- Documentation/filesystems/vfs.rst | 11 ++++ drivers/staging/exfat/exfat_super.c | 9 ++-- fs/block_dev.c | 9 ++-- fs/btrfs/extent_io.c | 15 ++---- fs/btrfs/extent_io.h | 2 +- fs/btrfs/inode.c | 18 +++---- fs/erofs/data.c | 34 +++++------- fs/erofs/zdata.c | 21 +++----- fs/ext2/inode.c | 12 ++--- fs/ext4/ext4.h | 2 +- fs/ext4/inode.c | 24 ++++----- fs/ext4/readpage.c | 20 +++---- fs/f2fs/data.c | 33 +++++------- fs/fat/inode.c | 8 +-- fs/fuse/file.c | 35 ++++++------ fs/gfs2/aops.c | 20 ++++--- fs/hpfs/file.c | 8 +-- fs/iomap/buffered-io.c | 74 ++++++-------------------- fs/iomap/trace.h | 2 +- fs/isofs/inode.c | 9 ++-- fs/jfs/inode.c | 8 +-- fs/mpage.c | 38 +++++--------- fs/nilfs2/inode.c | 13 ++--- fs/ocfs2/aops.c | 32 +++++------ fs/omfs/file.c | 8 +-- fs/qnx6/inode.c | 8 +-- fs/reiserfs/inode.c | 10 ++-- fs/udf/inode.c | 8 +-- fs/xfs/xfs_aops.c | 10 ++-- include/linux/fs.h | 2 + include/linux/iomap.h | 2 +- include/linux/mpage.h | 2 +- include/linux/pagemap.h | 12 +++++ include/trace/events/erofs.h | 6 +-- include/trace/events/f2fs.h | 6 +-- mm/internal.h | 2 +- mm/migrate.c | 2 +- mm/readahead.c | 76 +++++++++++++++++---------- 39 files changed, 289 insertions(+), 329 deletions(-)