From mboxrd@z Thu Jan 1 00:00:00 1970 From: Steven Whitehouse Date: Wed, 10 Jun 2009 09:31:05 +0100 Subject: [Cluster-devel] [PATCH 24/24] GFS2: Fix cache coherency between truncate and O_DIRECT read In-Reply-To: <1244622665-7470-24-git-send-email-swhiteho@redhat.com> References: <1244622665-7470-1-git-send-email-swhiteho@redhat.com> <1244622665-7470-2-git-send-email-swhiteho@redhat.com> <1244622665-7470-3-git-send-email-swhiteho@redhat.com> <1244622665-7470-4-git-send-email-swhiteho@redhat.com> <1244622665-7470-5-git-send-email-swhiteho@redhat.com> <1244622665-7470-6-git-send-email-swhiteho@redhat.com> <1244622665-7470-7-git-send-email-swhiteho@redhat.com> <1244622665-7470-8-git-send-email-swhiteho@redhat.com> <1244622665-7470-9-git-send-email-swhiteho@redhat.com> <1244622665-7470-10-git-send-email-swhiteho@redhat.com> <1244622665-7470-11-git-send-email-swhiteho@redhat.com> <1244622665-7470-12-git-send-email-swhiteho@redhat.com> <1244622665-7470-13-git-send-email-swhiteho@redhat.com> <1244622665-7470-14-git-send-email-swhiteho@redhat.com> <1244622665-7470-15-git-send-email-swhiteho@redhat.com> <1244622665-7470-16-git-send-email-swhiteho@redhat.com> <1244622665-7470-17-git-send-email-swhiteho@redhat.com> <1244622665-7470-18-git-send-email-swhiteho@redhat.com> <1244622665-7470-19-git-send-email-swhiteho@redhat.com> <1244622665-7470-20-git-send-email-swhiteho@redhat.com> <1244622665-7470-21-git-send-email-swhiteho@redhat.com> <1244622665-7470-22-git-send-email-swhiteho@redhat.com> <1244622665-7470-23-git-send-email-swhiteho@redhat.com> <1244622665-7470-24-git-send-email-swhiteho@redhat.com> Message-ID: <1244622665-7470-25-git-send-email-swhiteho@redhat.com> List-Id: To: cluster-devel.redhat.com MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit 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 Signed-off-by: Steven Whitehouse diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c index 1153a07..3297635 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); -- 1.6.0.6