Support adding a spare to a degraded array.

[thirdparty/mdadm.git] / mdmon.h

diff --git a/mdmon.h b/mdmon.h
index ad1a678112d33716c3d87142cf9bac167430cb2b..11320ef6994dc65bcd7cb701a77b939d719f23b4 100644 (file)
--- a/mdmon.h
+++ b/mdmon.h
@@ -16,12 +16,31 @@ struct active_array {
        enum array_state prev_state, curr_state, next_state;
        enum sync_action prev_action, curr_action, next_action;
 
+       int check_degraded; /* flag set by mon, read by manage */
+
        int devnum;
 
        unsigned long long resync_start;
 };
 
-
+/*
+ * Metadata updates are handled by the monitor thread,
+ * as it has exclusive access to the metadata.
+ * When the manager want to updates metadata, either
+ * for it's own reason (e.g. committing a spare) or
+ * on behalf of mdadm, it creates a metadata_update
+ * structure and queues it to the monitor.
+ * Updates are created and processed by code under the
+ * superswitch.  All common code sees them as opaque
+ * blobs.
+ */
+struct metadata_update {
+       int     len;
+       char    *buf;
+       void    *space; /* allocated space that monitor will use */
+       struct metadata_update *next;
+};
+extern struct metadata_update *update_queue, *update_queue_handled;
 
 #define MD_MAJOR 9