ocfs2: Abstract out node number queries.
ocfs2 asks the cluster stack for the local node's node number for two
reasons; to fill the slot map and to print it. While the slot map isn't
necessary for userspace cluster stacks, the printing is very nice for
debugging. Thus we add ocfs2_cluster_this_node() as a generic API to get
this value. It is anticipated that the slot map will not be used under a
userspace cluster stack, so validity checks of the node num only need to
exist in the slot map code. Otherwise, it just gets used and printed as an
opaque value.
[ Fixed up some "int" versus "unsigned int" issues and made osb->node_num
truly opaque. --Mark ]
Signed-off-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>
diff --git a/fs/ocfs2/stackglue.c b/fs/ocfs2/stackglue.c
index f6f309a..8146863 100644
--- a/fs/ocfs2/stackglue.c
+++ b/fs/ocfs2/stackglue.c
@@ -25,6 +25,8 @@
#include <linux/fs.h>
#include "cluster/masklog.h"
+#include "cluster/nodemanager.h"
+
#include "stackglue.h"
static struct ocfs2_locking_protocol *lproto;
@@ -371,6 +373,21 @@
return 0;
}
+int ocfs2_cluster_this_node(unsigned int *node)
+{
+ int node_num;
+
+ node_num = o2nm_this_node();
+ if (node_num == O2NM_INVALID_NODE_NUM)
+ return -ENOENT;
+
+ if (node_num >= O2NM_MAX_NODES)
+ return -EOVERFLOW;
+
+ *node = node_num;
+ return 0;
+}
+
void o2cb_get_stack(struct ocfs2_locking_protocol *proto)
{
BUG_ON(proto == NULL);