ocfs2: Added post handler callable function in o2net message handler

Currently o2net allows one handler function per message type. This
patch adds the ability to call another function to be called after
the handler has returned the message to the other node.

Handlers are now given the option of returning a context (in the form of a
void **) which will be passed back into the post message handler function.

Signed-off-by: Kurt Hackel <kurt.hackel@oracle.com>
Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com>
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>

1 files changed, 28 insertions, 14 deletions

diff --git a/fs/ocfs2/dlm/dlmcommon.h b/fs/ocfs2/dlm/dlmcommon.h
index e95ecb2aaf14..2df6fde3e652 100644
--- a/fs/ocfs2/dlm/dlmcommon.h
+++ b/fs/ocfs2/dlm/dlmcommon.h
@@ -707,16 +707,20 @@ void dlm_lock_put(struct dlm_lock *lock);
 void dlm_lock_attach_lockres(struct dlm_lock *lock,
                              struct dlm_lock_resource *res);
 
-int dlm_create_lock_handler(struct o2net_msg *msg, u32 len, void *data);
-int dlm_convert_lock_handler(struct o2net_msg *msg, u32 len, void *data);
-int dlm_proxy_ast_handler(struct o2net_msg *msg, u32 len, void *data);
+int dlm_create_lock_handler(struct o2net_msg *msg, u32 len, void *data,
+                            void **ret_data);
+int dlm_convert_lock_handler(struct o2net_msg *msg, u32 len, void *data,
+                             void **ret_data);
+int dlm_proxy_ast_handler(struct o2net_msg *msg, u32 len, void *data,
+                          void **ret_data);
 
 void dlm_revert_pending_convert(struct dlm_lock_resource *res,
                                 struct dlm_lock *lock);
 void dlm_revert_pending_lock(struct dlm_lock_resource *res,
                              struct dlm_lock *lock);
 
-int dlm_unlock_lock_handler(struct o2net_msg *msg, u32 len, void *data);
+int dlm_unlock_lock_handler(struct o2net_msg *msg, u32 len, void *data,
+                            void **ret_data);
 void dlm_commit_pending_cancel(struct dlm_lock_resource *res,
                                struct dlm_lock *lock);
 void dlm_commit_pending_unlock(struct dlm_lock_resource *res,
@@ -871,16 +875,26 @@ void dlm_lockres_release_ast(struct dlm_ctxt *dlm,
                              struct dlm_lock_resource *res);
 void __dlm_lockres_reserve_ast(struct dlm_lock_resource *res);
 
-int dlm_master_request_handler(struct o2net_msg *msg, u32 len, void *data);
-int dlm_assert_master_handler(struct o2net_msg *msg, u32 len, void *data);
-int dlm_deref_lockres_handler(struct o2net_msg *msg, u32 len, void *data);
-int dlm_migrate_request_handler(struct o2net_msg *msg, u32 len, void *data);
-int dlm_mig_lockres_handler(struct o2net_msg *msg, u32 len, void *data);
-int dlm_master_requery_handler(struct o2net_msg *msg, u32 len, void *data);
-int dlm_request_all_locks_handler(struct o2net_msg *msg, u32 len, void *data);
-int dlm_reco_data_done_handler(struct o2net_msg *msg, u32 len, void *data);
-int dlm_begin_reco_handler(struct o2net_msg *msg, u32 len, void *data);
-int dlm_finalize_reco_handler(struct o2net_msg *msg, u32 len, void *data);
+int dlm_master_request_handler(struct o2net_msg *msg, u32 len, void *data,
+                               void **ret_data);
+int dlm_assert_master_handler(struct o2net_msg *msg, u32 len, void *data,
+                              void **ret_data);
+int dlm_deref_lockres_handler(struct o2net_msg *msg, u32 len, void *data,
+                              void **ret_data);
+int dlm_migrate_request_handler(struct o2net_msg *msg, u32 len, void *data,
+                                void **ret_data);
+int dlm_mig_lockres_handler(struct o2net_msg *msg, u32 len, void *data,
+                            void **ret_data);
+int dlm_master_requery_handler(struct o2net_msg *msg, u32 len, void *data,
+                               void **ret_data);
+int dlm_request_all_locks_handler(struct o2net_msg *msg, u32 len, void *data,
+                                  void **ret_data);
+int dlm_reco_data_done_handler(struct o2net_msg *msg, u32 len, void *data,
+                               void **ret_data);
+int dlm_begin_reco_handler(struct o2net_msg *msg, u32 len, void *data,
+                           void **ret_data);
+int dlm_finalize_reco_handler(struct o2net_msg *msg, u32 len, void *data,
+                              void **ret_data);
 int dlm_do_master_requery(struct dlm_ctxt *dlm, struct dlm_lock_resource *res,
                           u8 nodenum, u8 *real_master);