linux-kernel - [PATCH 56/58] [GFS2] Fix page

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Message-Id: <3fa0be40338b94030dcf4794198c65cc99e260fa.1200905287.git.swhiteho@redhat.com>
Date:	Mon, 21 Jan 2008 09:22:14 +0000
From:	swhiteho@...hat.com
To:	linux-kernel@...r.kernel.org, cluster-devel@...hat.com
Cc:	Steven Whitehouse <swhiteho@...hat.com>
Subject: [PATCH 56/58] [GFS2] Fix page_mkwrite truncation race path

From: Steven Whitehouse <swhiteho@...hat.com>

There was a bug in the truncation/invalidation race path for
->page_mkwrite for gfs2. It ought to return 0 so that the effect is the
same as if the page was truncated at any of the other points at which
the page_lock is dropped. This will result in the restart of the whole
page fault path. If it was due to a real truncation (as opposed to an
invalidate because we let a glock go) then the ->fault path will pick
that up when it gets called again.

Signed-off-by: Steven Whitehouse <swhiteho@...hat.com>

diff --git a/fs/gfs2/ops_file.c b/fs/gfs2/ops_file.c
index d7f4726..f4842f2 100644
--- a/fs/gfs2/ops_file.c
+++ b/fs/gfs2/ops_file.c
@@ -394,6 +394,7 @@ static int gfs2_page_mkwrite(struct vm_area_struct *vma, struct page *page)
 	last_index = ip->i_inode.i_size >> PAGE_CACHE_SHIFT;
 	if (page->index > last_index)
 		goto out_unlock_page;
+	ret = 0;
 	if (!PageUptodate(page) || page->mapping != ip->i_inode.i_mapping)
 		goto out_unlock_page;
 	if (gfs2_is_stuffed(ip)) {
-- 
1.5.1.2

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