ocfs2: Hang the locking proto on the cluster conn and use it in asts.

With the ocfs2_cluster_connection hanging off of the ocfs2_dlm_lksb, we
have access to it in the ast and bast wrapper functions.  Attach the
ocfs2_locking_protocol to the conn.

Now, instead of refering to a static variable for ast/bast pointers, the
wrappers can look at the connection.  This means different connections
can have different ast/bast pointers, and it reduces the need for the
static pointer.
Signed-off-by: Joel Becker <joel.becker@oracle.com>

fs/ocfs2/stack_o2cb.c

@@ -163,28 +163,21 @@ static void o2dlm_lock_ast_wrapper(void *astarg)
 {
 	struct ocfs2_dlm_lksb *lksb = astarg;
 
-	BUG_ON(o2cb_stack.sp_proto == NULL);
-
-	o2cb_stack.sp_proto->lp_lock_ast(lksb);
+	lksb->lksb_conn->cc_proto->lp_lock_ast(lksb);
 }
 
 static void o2dlm_blocking_ast_wrapper(void *astarg, int level)
 {
 	struct ocfs2_dlm_lksb *lksb = astarg;
 
-	BUG_ON(o2cb_stack.sp_proto == NULL);
-
-	o2cb_stack.sp_proto->lp_blocking_ast(lksb, level);
+	lksb->lksb_conn->cc_proto->lp_blocking_ast(lksb, level);
 }
 
 static void o2dlm_unlock_ast_wrapper(void *astarg, enum dlm_status status)
 {
 	struct ocfs2_dlm_lksb *lksb = astarg;
-
 	int error = dlm_status_to_errno(status);
 
-	BUG_ON(o2cb_stack.sp_proto == NULL);
-
 	/*
 	 * In o2dlm, you can get both the lock_ast() for the lock being
 	 * granted and the unlock_ast() for the CANCEL failing.  A
@@ -199,7 +192,7 @@ static void o2dlm_unlock_ast_wrapper(void *astarg, enum dlm_status status)
 	if (status == DLM_CANCELGRANT)
 		return;
 
-	o2cb_stack.sp_proto->lp_unlock_ast(lksb, error);
+	lksb->lksb_conn->cc_proto->lp_unlock_ast(lksb, error);
 }
 
 static int o2cb_dlm_lock(struct ocfs2_cluster_connection *conn,
@@ -284,7 +277,7 @@ static int o2cb_cluster_connect(struct ocfs2_cluster_connection *conn)
 	struct dlm_protocol_version fs_version;
 
 	BUG_ON(conn == NULL);
-	BUG_ON(o2cb_stack.sp_proto == NULL);
+	BUG_ON(conn->cc_proto == NULL);
 
 	/* for now we only have one cluster/node, make sure we see it
 	 * in the heartbeat universe */

fs/ocfs2/stack_user.c

@@ -668,8 +668,6 @@ static void fsdlm_lock_ast_wrapper(void *astarg)
 	struct ocfs2_dlm_lksb *lksb = astarg;
 	int status = lksb->lksb_fsdlm.sb_status;
 
-	BUG_ON(ocfs2_user_plugin.sp_proto == NULL);
-
 	/*
 	 * For now we're punting on the issue of other non-standard errors
 	 * where we can't tell if the unlock_ast or lock_ast should be called.
@@ -681,18 +679,16 @@ static void fsdlm_lock_ast_wrapper(void *astarg)
 	 */
 
 	if (status == -DLM_EUNLOCK || status == -DLM_ECANCEL)
-		ocfs2_user_plugin.sp_proto->lp_unlock_ast(lksb, 0);
+		lksb->lksb_conn->cc_proto->lp_unlock_ast(lksb, 0);
 	else
-		ocfs2_user_plugin.sp_proto->lp_lock_ast(lksb);
+		lksb->lksb_conn->cc_proto->lp_lock_ast(lksb);
 }
 
 static void fsdlm_blocking_ast_wrapper(void *astarg, int level)
 {
 	struct ocfs2_dlm_lksb *lksb = astarg;
 
-	BUG_ON(ocfs2_user_plugin.sp_proto == NULL);
-
-	ocfs2_user_plugin.sp_proto->lp_blocking_ast(lksb, level);
+	lksb->lksb_conn->cc_proto->lp_blocking_ast(lksb, level);
 }
 
 static int user_dlm_lock(struct ocfs2_cluster_connection *conn,

fs/ocfs2/stackglue.c

@@ -343,6 +343,7 @@ int ocfs2_cluster_connect(const char *stack_name,
 	new_conn->cc_recovery_handler = recovery_handler;
 	new_conn->cc_recovery_data = recovery_data;
 
+	new_conn->cc_proto = lproto;
 	/* Start the new connection at our maximum compatibility level */
 	new_conn->cc_version = lproto->lp_max_version;
 

fs/ocfs2/stackglue.h

@@ -100,6 +100,7 @@ struct ocfs2_cluster_connection {
 	char cc_name[GROUP_NAME_MAX];
 	int cc_namelen;
 	struct ocfs2_protocol_version cc_version;
+	struct ocfs2_locking_protocol *cc_proto;
 	void (*cc_recovery_handler)(int node_num, void *recovery_data);
 	void *cc_recovery_data;
 	void *cc_lockspace;