[GFS2] Ensure journal file cache is flushed after recovery

This is for bugzilla bug #248176: GFS2: invalid metadata block

Patches 1 thru 3 were accepted upstream, but there were problems
with 4 and 5.  Those issues have been resolved and now the recovery
tests are passing without errors.  This code has gone through
41 * 3 successful gfs2 recovery tests before it hit an
unrelated (openais) problem.  I'm continuing to test it.

This is a complete rewrite of patch 5 for bug #248176, written by
Steve Whitehouse.  This is referred to in the bugzilla record as
"new 6" and "a different solution".

The problem was that the journal inodes, although protected by
a glock, were not synched with the other nodes because they don't
use the inode glock synch operations (i.e. no "glops" were defined).
Therefore, journal recovery on a journal-recovering node were causing
the blocks to get out of sync with the node that was actually trying
to use that journal as it comes back up from a reboot.

There are two possible solutions: (1) To make the journals use the
normal inode glock sync operations, or (2) To make the journal
operations take effect immediately (i.e. no caching).  Although
option 1 works, it turns out to be a lot more code.  Steve opted
for option 2, which is much simpler and therefore less prone to
regression errors.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

--

2 files changed, 2 insertions, 2 deletions

diff --git a/fs/gfs2/ops_fstype.c b/fs/gfs2/ops_fstype.c
index 58c730be2073..f0bcaa25737c 100644
--- a/fs/gfs2/ops_fstype.c
+++ b/fs/gfs2/ops_fstype.c
@@ -358,7 +358,7 @@ static int init_journal(struct gfs2_sbd *sdp, int undo)
 
                 ip = GFS2_I(sdp->sd_jdesc->jd_inode);
                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
-                                           LM_FLAG_NOEXP | GL_EXACT,
+                                           LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE,
                                            &sdp->sd_jinode_gh);
                 if (error) {
                         fs_err(sdp, "can't acquire journal inode glock: %d\n",
diff --git a/fs/gfs2/recovery.c b/fs/gfs2/recovery.c
index 5ada38c99a2c..beb6c7ac0086 100644
--- a/fs/gfs2/recovery.c
+++ b/fs/gfs2/recovery.c
@@ -469,7 +469,7 @@ int gfs2_recover_journal(struct gfs2_jdesc *jd)
                 };
 
                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
-                                           LM_FLAG_NOEXP, &ji_gh);
+                                           LM_FLAG_NOEXP | GL_NOCACHE, &ji_gh);
                 if (error)
                         goto fail_gunlock_j;
         } else {