From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from userp2130.oracle.com ([156.151.31.86]:39418 "EHLO userp2130.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726286AbeK1KnK (ORCPT ); Wed, 28 Nov 2018 05:43:10 -0500 Received: from pps.filterd (userp2130.oracle.com [127.0.0.1]) by userp2130.oracle.com (8.16.0.22/8.16.0.22) with SMTP id wARNYjK7061663 for ; Tue, 27 Nov 2018 23:43:36 GMT Received: from aserv0021.oracle.com (aserv0021.oracle.com [141.146.126.233]) by userp2130.oracle.com with ESMTP id 2nxx2u774n-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK) for ; Tue, 27 Nov 2018 23:43:36 +0000 Received: from aserv0122.oracle.com (aserv0122.oracle.com [141.146.126.236]) by aserv0021.oracle.com (8.14.4/8.14.4) with ESMTP id wARNhZtW030684 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK) for ; Tue, 27 Nov 2018 23:43:35 GMT Received: from abhmp0007.oracle.com (abhmp0007.oracle.com [141.146.116.13]) by aserv0122.oracle.com (8.14.4/8.14.4) with ESMTP id wARNhZSB020844 for ; Tue, 27 Nov 2018 23:43:35 GMT Date: Tue, 27 Nov 2018 15:43:34 -0800 From: "Darrick J. Wong" Subject: [PATCH] xfs: fix PAGE_MASK usage in xfs_free_file_space Message-ID: <20181127234334.GB8125@magnolia> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Sender: linux-xfs-owner@vger.kernel.org List-ID: List-Id: xfs To: xfs From: Darrick J. Wong 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 --- 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 404e581f1ea1..1ee8c5539fa4 100644 --- a/fs/xfs/xfs_bmap_util.c +++ b/fs/xfs/xfs_bmap_util.c @@ -1126,9 +1126,9 @@ 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;