Support adding a spare to a degraded array.

[thirdparty/mdadm.git] / mdadm.h

diff --git a/mdadm.h b/mdadm.h
index 783cd82d7ec42b0ea495379896d5570fbfd6298f..79ec5e294bc22bb7ebae7bf8e8f22ff6ed709085 100644 (file)
--- a/mdadm.h
+++ b/mdadm.h
@@ -372,6 +372,7 @@ extern mapping_t r5layout[], pers[], modes[], faultylayout[];
 extern char *map_dev(int major, int minor, int create);
 
 struct active_array;
+struct metadata_update;
 
 extern struct superswitch {
        void (*examine_super)(struct supertype *st, char *homehost);
@@ -433,8 +434,19 @@ extern struct superswitch {
         * not in fact changed.
         */
        void (*set_disk)(struct active_array *a, int n, int state);
-       void (*sync_metadata)(struct active_array *a);
-
+       void (*sync_metadata)(struct supertype *st);
+       void (*process_update)(struct supertype *st,
+                              struct metadata_update *update);
+
+       /* activate_spare will check if the array is degraded and, if it
+        * is, try to find some spare space in the container.
+        * On success, it add appropriate updates (For process_update) to
+        * to the 'updates' list and returns a list of 'mdinfo' identifying
+        * the device, or devices as there might be multiple missing
+        * devices and multiple spares available.
+        */
+       struct mdinfo *(*activate_spare)(struct active_array *a,
+                                        struct metadata_update **updates);
 
        int major;
        int swapuuid; /* true if uuid is bigending rather than hostendian */