add infrastructure to receive higher order commands, like remove_device

From: Dan Williams <dan.j.williams@intel.com>

Each md_message encapsulates a single command.  A command includes an 'action'
member which describes what if any data comes after the action.  Communication
with the monitor involves updating the active_cmd pointer and then writing to
mgr_pipe.  Pass/fail status is returned via mon_pipe.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/mdmon.h b/mdmon.h
index 3886b09e..e83f4236 100644
--- a/mdmon.h
+++ b/mdmon.h
@@ -31,6 +31,7 @@ extern struct active_array *container;
 extern struct active_array *array_list;
 extern struct active_array *discard_this;
 extern struct active_array *pending_discard;
+extern struct md_generic_cmd *active_cmd;
 
 
 void do_monitor(struct supertype *container);