1 files changed, 23 insertions, 1 deletions

diff --git a/fs/ocfs2/dlm/dlmcommon.h b/fs/ocfs2/dlm/dlmcommon.h
index e90b92f9ece1..9843ee17ea27 100644
--- a/fs/ocfs2/dlm/dlmcommon.h
+++ b/fs/ocfs2/dlm/dlmcommon.h
@@ -142,6 +142,12 @@ struct dlm_ctxt
         spinlock_t work_lock;
         struct list_head dlm_domain_handlers;
         struct list_head        dlm_eviction_callbacks;
+
+        /* The filesystem specifies this at domain registration.  We
+         * cache it here to know what to tell other nodes. */
+        struct dlm_protocol_version fs_locking_proto;
+        /* This is the inter-dlm communication version */
+        struct dlm_protocol_version dlm_locking_proto;
 };
 
 static inline struct hlist_head *dlm_lockres_hash(struct dlm_ctxt *dlm, unsigned i)
@@ -589,10 +595,24 @@ struct dlm_proxy_ast
 #define DLM_PROXY_AST_MAX_LEN  (sizeof(struct dlm_proxy_ast)+DLM_LVB_LEN)
 
 #define DLM_MOD_KEY (0x666c6172)
-enum dlm_query_join_response {
+enum dlm_query_join_response_code {
         JOIN_DISALLOW = 0,
         JOIN_OK,
         JOIN_OK_NO_MAP,
+        JOIN_PROTOCOL_MISMATCH,
+};
+
+union dlm_query_join_response {
+        u32 intval;
+        struct {
+                u8 code;        /* Response code.  dlm_minor and fs_minor
+                                   are only valid if this is JOIN_OK */
+                u8 dlm_minor;   /* The minor version of the protocol the
+                                   dlm is speaking. */
+                u8 fs_minor;    /* The minor version of the protocol the
+                                   filesystem is speaking. */
+                u8 reserved;
+        } packet;
 };
 
 struct dlm_lock_request
@@ -633,6 +653,8 @@ struct dlm_query_join_request
         u8 node_idx;
         u8 pad1[2];
         u8 name_len;
+        struct dlm_protocol_version dlm_proto;
+        struct dlm_protocol_version fs_proto;
         u8 domain[O2NM_MAX_NAME_LEN];
         u8 node_map[BITS_TO_BYTES(O2NM_MAX_NODES)];
 };