imsm: Add metadata update type for general migration check-pointing

There are 2 places for keeping checkpoint information:
- metadata (per volume information used during volume
  initialization and rebuilding).
- migration record (per container information used during
  migration/reshape)

During reshape both checkpoints has to contains the same information.
To do this mdadm will send metadta update with checkpoint information.

Note: Checkpoint information consistence is not critical. During general
      migration restart, information from migration record is used only.

Signed-off-by: Adam Kwolek <adam.kwolek@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>

1 files changed, 7 insertions, 1 deletions

diff --git a/super-intel.c b/super-intel.c
index 7654a11..73c6f32 100644
--- a/super-intel.c
+++ b/super-intel.c
@@ -345,7 +345,8 @@ enum imsm_update_type {
 	update_add_remove_disk,
 	update_reshape_container_disks,
 	update_reshape_migration,
-	update_takeover
+	update_takeover,
+	update_general_migration_checkpoint,
 };
 
 struct imsm_update_activate_spare {
@@ -398,6 +399,11 @@ struct imsm_update_reshape_migration {
 	int new_disks[1]; /* new_raid_disks - old_raid_disks makedev number */
 };
 
+struct imsm_update_general_migration_checkpoint {
+	enum imsm_update_type type;
+	__u32 curr_migr_unit;
+};
+
 struct disk_info {
 	__u8 serial[MAX_RAID_SERIAL_LEN];
 };