New RESHAPE_NO_BACKUP flag to track when backup action is needed.

Some arrays (raid10) never need a backup file, so during assembly
we can avoid the whole Grow_continue check in that case.
Achieve this using a flag set by the metadata handler.

Also get "mdadm -I" to fail if a backup process would be
needed.  It currently does fail as the kernel rejects things,
but it is nicer to have this explicit.

Signed-off-by: NeilBrown <neilb@suse.de>

1 files changed, 1 insertions, 0 deletions

diff --git a/mdadm.h b/mdadm.h
index b808739a..457cc583 100644
--- a/mdadm.h
+++ b/mdadm.h
@@ -198,6 +198,7 @@ struct mdinfo {
 #define NO_RESHAPE		0
 #define VOLUME_RESHAPE		1
 #define CONTAINER_RESHAPE	2
+#define RESHAPE_NO_BACKUP	16 /* Mask 'or'ed in */
 	int			reshape_active;
 	unsigned long long	reshape_progress;
 	int			recovery_blocked; /* for external metadata it