From patchwork Mon Feb 4 16:54:26 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Luis Chamberlain X-Patchwork-Id: 10796119 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 63F67922 for ; Mon, 4 Feb 2019 16:54:40 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 515172BD5A for ; Mon, 4 Feb 2019 16:54:40 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 45AE82BD63; Mon, 4 Feb 2019 16:54:40 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E52012BD61 for ; Mon, 4 Feb 2019 16:54:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729545AbfBDQyj (ORCPT ); Mon, 4 Feb 2019 11:54:39 -0500 Received: from mail.kernel.org ([198.145.29.99]:37998 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727308AbfBDQyi (ORCPT ); Mon, 4 Feb 2019 11:54:38 -0500 Received: from garbanzo.lan (c-73-71-40-85.hsd1.ca.comcast.net [73.71.40.85]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 5C93121852; Mon, 4 Feb 2019 16:54:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1549299277; bh=LtvKI+fdGPoBiQ6LSKwiSZefwhkMMPlDUQ2dYPVkelQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=NPzvADpt5kQzsgE4xYmOgAdkok+ZlmL3emhz0fCVsoMryb/yrkwWTNMY8SHVMFwbC wrya1pgpsp/WvXhcqDjJKuESqPVxgq0qAL35K+EXH97WfM19Ms99ZdcTyu1fU4IUWw 2yqXBS6VPGRphbEvpqVXPoRnnvC40kMIiF13MkOU= From: Luis Chamberlain To: linux-xfs@vger.kernel.org, gregkh@linuxfoundation.org, Alexander.Levin@microsoft.com Cc: stable@vger.kernel.org, amir73il@gmail.com, hch@infradead.org, "Darrick J. Wong" , Luis Chamberlain Subject: [PATCH v2 09/10] xfs: fix PAGE_MASK usage in xfs_free_file_space Date: Mon, 4 Feb 2019 08:54:26 -0800 Message-Id: <20190204165427.23607-10-mcgrof@kernel.org> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20190204165427.23607-1-mcgrof@kernel.org> References: <20190204165427.23607-1-mcgrof@kernel.org> Sender: linux-xfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-xfs@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: "Darrick J. Wong" commit a579121f94aba4e8bad1a121a0fad050d6925296 upstream. In commit e53c4b598, I *tried* to teach xfs to force writeback when we fzero/fpunch right up to EOF so that if EOF is in the middle of a page, the post-EOF part of the page gets zeroed before we return to userspace. Unfortunately, I missed the part where PAGE_MASK is ~(PAGE_SIZE - 1), which means that we totally fail to zero if we're fpunching and EOF is within the first page. Worse yet, the same PAGE_MASK thinko plagues the filemap_write_and_wait_range call, so we'd initiate writeback of the entire file, which (mostly) masked the thinko. Drop the tricky PAGE_MASK and replace it with correct usage of PAGE_SIZE and the proper rounding macros. Fixes: e53c4b598 ("xfs: ensure post-EOF zeroing happens after zeroing part of a file") Signed-off-by: Darrick J. Wong Reviewed-by: Dave Chinner Reviewed-by: Christoph Hellwig Signed-off-by: Luis Chamberlain --- fs/xfs/xfs_bmap_util.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c index 9d1e5c3a661e..211b06e4702e 100644 --- a/fs/xfs/xfs_bmap_util.c +++ b/fs/xfs/xfs_bmap_util.c @@ -1175,9 +1175,9 @@ xfs_free_file_space( * page could be mmap'd and iomap_zero_range doesn't do that for us. * Writeback of the eof page will do this, albeit clumsily. */ - if (offset + len >= XFS_ISIZE(ip) && ((offset + len) & PAGE_MASK)) { + if (offset + len >= XFS_ISIZE(ip) && offset_in_page(offset + len) > 0) { error = filemap_write_and_wait_range(VFS_I(ip)->i_mapping, - (offset + len) & ~PAGE_MASK, LLONG_MAX); + round_down(offset + len, PAGE_SIZE), LLONG_MAX); } return error;