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=-6.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 E488CCA9ED3 for ; Sat, 2 Nov 2019 13:13:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BBAE7218AC for ; Sat, 2 Nov 2019 13:13:11 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=yandex-team.ru header.i=@yandex-team.ru header.b="OxUUATt2" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726907AbfKBNNI (ORCPT ); Sat, 2 Nov 2019 09:13:08 -0400 Received: from forwardcorp1p.mail.yandex.net ([77.88.29.217]:56690 "EHLO forwardcorp1p.mail.yandex.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726380AbfKBNNH (ORCPT ); Sat, 2 Nov 2019 09:13:07 -0400 Received: from mxbackcorp1o.mail.yandex.net (mxbackcorp1o.mail.yandex.net [IPv6:2a02:6b8:0:1a2d::301]) by forwardcorp1p.mail.yandex.net (Yandex) with ESMTP id 642102E099D; Sat, 2 Nov 2019 16:13:05 +0300 (MSK) Received: from iva4-c987840161f8.qloud-c.yandex.net (iva4-c987840161f8.qloud-c.yandex.net [2a02:6b8:c0c:3da5:0:640:c987:8401]) by mxbackcorp1o.mail.yandex.net (nwsmtp/Yandex) with ESMTP id o44VC5sfra-D4juUgbU; Sat, 02 Nov 2019 16:13:05 +0300 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yandex-team.ru; s=default; t=1572700385; bh=H7FmyTVkpiw9VXplqlyRxQrERQupmOL/uyKSLjwdIdg=; h=In-Reply-To:Message-ID:References:Date:To:From:Subject:Cc; b=OxUUATt2MW6cMx8NEijyWMs0vDxqyGl9Hu5nQSsfhVkprtv1/Uv5n1WLtyT/WW5hL oPYbwCOT+g28r8eaffciKLzmSqkXrHs4WcMOKNUQLBFbTteXGYUs5zkdobEY6yi0GZ 4oF+DIH/CFEoJDGPesZ7+RmfP7TAE9OO2iza5z3g= Authentication-Results: mxbackcorp1o.mail.yandex.net; dkim=pass header.i=@yandex-team.ru Received: from dynamic-red.dhcp.yndx.net (dynamic-red.dhcp.yndx.net [2a02:6b8:0:40c:8554:53c0:3d75:2e8a]) by iva4-c987840161f8.qloud-c.yandex.net (nwsmtp/Yandex) with ESMTPSA id lWH2NgOfEQ-D4VWcMj0; Sat, 02 Nov 2019 16:13:04 +0300 (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client certificate not present) Subject: [PATCH v2 3/3] fs: warn if stale pagecache is left after direct write From: Konstantin Khlebnikov To: linux-mm@kvack.org, Andrew Morton , linux-kernel@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org, Jens Axboe , Jan Kara , Alexander Viro Date: Sat, 02 Nov 2019 16:13:03 +0300 Message-ID: <157270038294.4812.2238891109785106069.stgit@buzz> In-Reply-To: <157270037850.4812.15036239021726025572.stgit@buzz> References: <157270037850.4812.15036239021726025572.stgit@buzz> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Function generic_file_direct_write() tries to invalidate pagecache after O_DIRECT write. Unlike to similar code in dio_complete() this silently ignores error returned from invalidate_inode_pages2_range(). According to comment this code here because not all filesystems call dio_complete() to do proper invalidation after O_DIRECT write. Noticeable example is a blkdev_direct_IO(). This patch calls dio_warn_stale_pagecache() if invalidation fails. Signed-off-by: Konstantin Khlebnikov --- mm/filemap.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/mm/filemap.c b/mm/filemap.c index 189b8f318da2..dc3b78db079b 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -3241,11 +3241,13 @@ generic_file_direct_write(struct kiocb *iocb, struct iov_iter *from) * do not end up with dio_complete() being called, so let's not break * them by removing it completely. * + * Noticeable example is a blkdev_direct_IO(). + * * Skip invalidation for async writes or if mapping has no pages. */ - if (written > 0 && mapping->nrpages) - invalidate_inode_pages2_range(mapping, - pos >> PAGE_SHIFT, end); + if (written > 0 && mapping->nrpages && + invalidate_inode_pages2_range(mapping, pos >> PAGE_SHIFT, end)) + dio_warn_stale_pagecache(file); if (written > 0) { pos += written;