ocfs2: Break out stackglue into modules.

We define the ocfs2_stack_plugin structure to represent a stack driver.
The o2cb stack code is split into stack_o2cb.c.  This becomes the
ocfs2_stack_o2cb.ko module.

The stackglue generic functions are similarly split into the
ocfs2_stackglue.ko module.  This module now provides an interface to
register drivers.  The ocfs2_stack_o2cb driver registers itself.  As
part of this interface, ocfs2_stackglue can load drivers on demand.
This is accomplished in ocfs2_cluster_connect().

ocfs2_cluster_disconnect() is now notified when a _hangup() is pending.
If a hangup is pending, it will not release the driver module and will
let _hangup() do that.

Signed-off-by: Joel Becker <joel.becker@oracle.com>

1 files changed, 9 insertions, 7 deletions

diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c
index b4a02a00665d..e27a0d47ea2b 100644
--- a/fs/ocfs2/super.c
+++ b/fs/ocfs2/super.c
@@ -1186,7 +1186,7 @@ leave:
 
 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err)
 {
-	int tmp;
+	int tmp, hangup_needed = 0;
 	struct ocfs2_super *osb = NULL;
 	char nodestr[8];
 
@@ -1225,19 +1225,21 @@ static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err)
 
 	ocfs2_release_system_inodes(osb);
 
-	if (osb->cconn)
-		ocfs2_dlm_shutdown(osb);
-
-	debugfs_remove(osb->osb_debug_root);
-
 	/*
-	 * This is a small hack to move ocfs2_hb_ctl into stackglue.
 	 * If we're dismounting due to mount error, mount.ocfs2 will clean
 	 * up heartbeat.  If we're a local mount, there is no heartbeat.
 	 * If we failed before we got a uuid_str yet, we can't stop
 	 * heartbeat.  Otherwise, do it.
 	 */
 	if (!mnt_err && !ocfs2_mount_local(osb) && osb->uuid_str)
+		hangup_needed = 1;
+
+	if (osb->cconn)
+		ocfs2_dlm_shutdown(osb, hangup_needed);
+
+	debugfs_remove(osb->osb_debug_root);
+
+	if (hangup_needed)
 		ocfs2_cluster_hangup(osb->uuid_str, strlen(osb->uuid_str));
 
 	atomic_set(&osb->vol_state, VOLUME_DISMOUNTED);