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=-3.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT 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 3F056C43141 for ; Fri, 15 Nov 2019 16:17:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2160520692 for ; Fri, 15 Nov 2019 16:17:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727740AbfKOQR1 (ORCPT ); Fri, 15 Nov 2019 11:17:27 -0500 Received: from mx2.suse.de ([195.135.220.15]:36786 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727520AbfKOQR1 (ORCPT ); Fri, 15 Nov 2019 11:17:27 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id C486EAC4A; Fri, 15 Nov 2019 16:17:25 +0000 (UTC) From: Goldwyn Rodrigues To: linux-btrfs@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org, hch@infradead.org, darrick.wong@oracle.com Subject: btrfs direct-io using iomap Date: Fri, 15 Nov 2019 10:16:53 -0600 Message-Id: <20191115161700.12305-1-rgoldwyn@suse.de> X-Mailer: git-send-email 2.16.4 Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org This is an effort to use iomap for direct I/O in btrfs. This would change the call from __blockdev_direct_io() to iomap_dio_rw(). The main objective is to lose the buffer head and use bio defined by iomap code, and hopefully to use more of generic-FS codebase. I have tested it against xfstests. The performance seems to be nearly the same on my VMs. -- Goldwyn fs/btrfs/ctree.h | 1 fs/btrfs/extent_io.c | 8 ++- fs/btrfs/file.c | 67 +++++++++++++++++++++++++- fs/btrfs/inode.c | 128 +++++++++++++++++++++----------------------------- fs/iomap/direct-io.c | 14 +++-- include/linux/fs.h | 2 include/linux/iomap.h | 2 mm/filemap.c | 13 ++--- 8 files changed, 147 insertions(+), 88 deletions(-)