From: Steven Whitehouse <swhiteho@redhat.com>
Date: Wed, 10 Jun 2009 08:09:40 +0000 (+0100)
Subject: GFS2: Fix cache coherency between truncate and O_DIRECT read
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=40bc9a27e00d6c8c7e4dc2865c02d7402a950472;p=linux-beck.git

GFS2: Fix cache coherency between truncate and O_DIRECT read

If a page was partially zeroed as the result of a truncate, then it was
not being correctly marked dirty. This resulted in the deleted data
reappearing if the file was read back via direct I/O.

Reported-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
---

diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c
index 1153a078920c..329763530dc0 100644
--- a/fs/gfs2/bmap.c
+++ b/fs/gfs2/bmap.c
@@ -1012,7 +1012,7 @@ static int gfs2_block_truncate_page(struct address_space *mapping)
 		gfs2_trans_add_bh(ip->i_gl, bh, 0);
 
 	zero_user(page, offset, length);
-
+	mark_buffer_dirty(bh);
 unlock:
 	unlock_page(page);
 	page_cache_release(page);