[PATCH 26/31] mdadm: add backup methods to superswitch

Add new methods to the superswitch for external metadata supporting its own critical reshape data backup mechanism.

The new methods are:
save_backup - save critical data to backup area discard_backup - critical data was successfully migrated, so
the current backup may be discarded recover_backup - recover critical data after reshape crashed
during array assembly

Signed-off-by: Maciej Trela
Signed-off-by: Adam Kwolek
---

mdadm/mdadm/mdadm.h | 9 +++++++++
1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/mdadm/mdadm/mdadm.h b/mdadm/mdadm/mdadm.h index 68df20b..b46b90e 100644
--- a/mdadm/mdadm/mdadm.h
+++ b/mdadm/mdadm/mdadm.h
@@ -727,6 +727,15 @@ extern struct superswitch {
int request_type,
struct metadata_update **updates);

+ /* for external backup area
+ *
+ */
+ int (*save_backup)(struct supertype *st, struct mdinfo *info,
+ void *buf, unsigned long write_offset, int length);
+ void (*discard_backup)(struct supertype *st, struct mdinfo *info);
+ int (*recover_backup)(struct supertype *st, struct mdinfo *info,
+ void *ptr, int length);
+
int swapuuid; /* true if uuid is bigending rather than hostendian */
int external;
const char *name; /* canonical metadata name */

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