From patchwork Fri Jul 22 07:12:19 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Biggers X-Patchwork-Id: 12926024 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 85EA1C43334 for ; Fri, 22 Jul 2022 07:14:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234363AbiGVHOH (ORCPT ); Fri, 22 Jul 2022 03:14:07 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37228 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232572AbiGVHOE (ORCPT ); Fri, 22 Jul 2022 03:14:04 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4D0D293C1E; Fri, 22 Jul 2022 00:14:03 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id BCD1862188; Fri, 22 Jul 2022 07:14:02 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id D8F25C341C6; Fri, 22 Jul 2022 07:14:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1658474042; bh=9mq8X3BGsuBzR6Ln4xciUKT8RQwcULSFGtUPi9jeosE=; h=From:To:Cc:Subject:Date:From; b=FLVRrpieLDHN39FkoGOUIAkHKLGpScI1ahdV3AgjGwfrcluvepuBzBT6F2984u3pe YxdD4BK8sy57CBvIm0XSdTFHQJcTcxNfBuwIZ22bE+QsqIcWOa3jZVywdVcsgMnYMl P8eZPra5KWYWA4zPs0rDJwnuri0qsYj5L/yrWJbb40slzWXWuRwOl/sdNhOL0RjjiZ t3hdZX2Thct6y6Piv8vzHp2E9U66v9l12USihLfnS30azOvbROyOeiNtaOmUZhk+ya QY9fg85OhHr4fbM1wBBORT+kBwT4kVrxB6luu3IFOzwg+6fTek78HFSblPNzVzfX+z MqEM0tbLisn/Q== From: Eric Biggers To: linux-fsdevel@vger.kernel.org Cc: linux-ext4@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-xfs@vger.kernel.org, linux-api@vger.kernel.org, linux-fscrypt@vger.kernel.org, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, Keith Busch Subject: [PATCH v4 0/9] make statx() return DIO alignment information Date: Fri, 22 Jul 2022 00:12:19 -0700 Message-Id: <20220722071228.146690-1-ebiggers@kernel.org> X-Mailer: git-send-email 2.37.0 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fscrypt@vger.kernel.org This patchset makes the statx() system call return direct I/O (DIO) alignment information. This allows userspace to easily determine whether a file supports DIO, and if so with what alignment restrictions. Patch 1 adds the basic VFS support for STATX_DIOALIGN. Patch 2 wires it up for all block device files. The remaining patches wire it up for regular files on ext4, f2fs, and xfs. Support for regular files on other filesystems can be added later. I've also written a man-pages patch, which I'm sending separately. Note, f2fs has one corner case where DIO reads are allowed but not DIO writes. The proposed statx fields can't represent this. My proposal (patch 6) is to just eliminate this case, as it seems much too weird. But I'd appreciate any feedback on that part. This patchset applies to v5.19-rc7. Changed v3 => v4: - Added xfs support. - Moved the helper function for block devices into block/bdev.c. - Adjusted the ext4 patch to not introduce a bug where misaligned DIO starts being allowed on encrypted files when it gets combined with the patch "iomap: add support for dma aligned direct-io" that is queued in the block tree for 5.20. - Made a simplification in fscrypt_dio_supported(). Changed v2 => v3: - Dropped the stx_offset_align_optimal field, since its purpose wasn't clearly distinguished from the existing stx_blksize. - Renamed STATX_IOALIGN to STATX_DIOALIGN, to reflect the new focus on DIO only. - Similarly, renamed stx_{mem,offset}_align_dio to stx_dio_{mem,offset}_align, to reflect the new focus on DIO only. - Wired up STATX_DIOALIGN on block device files. Changed v1 => v2: - No changes. Eric Biggers (9): statx: add direct I/O alignment information vfs: support STATX_DIOALIGN on block devices fscrypt: change fscrypt_dio_supported() to prepare for STATX_DIOALIGN ext4: support STATX_DIOALIGN f2fs: move f2fs_force_buffered_io() into file.c f2fs: don't allow DIO reads but not DIO writes f2fs: simplify f2fs_force_buffered_io() f2fs: support STATX_DIOALIGN xfs: support STATX_DIOALIGN block/bdev.c | 25 ++++++++++++++++++++ fs/crypto/inline_crypt.c | 49 +++++++++++++++++++-------------------- fs/ext4/ext4.h | 1 + fs/ext4/file.c | 37 ++++++++++++++++++++--------- fs/ext4/inode.c | 36 ++++++++++++++++++++++++++++ fs/f2fs/f2fs.h | 45 ----------------------------------- fs/f2fs/file.c | 45 ++++++++++++++++++++++++++++++++++- fs/stat.c | 14 +++++++++++ fs/xfs/xfs_iops.c | 9 +++++++ include/linux/blkdev.h | 4 ++++ include/linux/fscrypt.h | 7 ++---- include/linux/stat.h | 2 ++ include/uapi/linux/stat.h | 4 +++- 13 files changed, 190 insertions(+), 88 deletions(-) base-commit: ff6992735ade75aae3e35d16b17da1008d753d28