Grow: --backup-file and --data-offset are incompatible.

So report if both are given, and if --backup-file is given,
don't try to update data-offset.

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

1 files changed, 4 insertions, 3 deletions

diff --git a/Grow.c b/Grow.c
index 5d35e320..8794f4ec 100644
--- a/Grow.c
+++ b/Grow.c
@@ -2866,9 +2866,10 @@ started:
 		goto release;
 	}
 
-	switch(set_new_data_offset(sra, st, devname, info->delta_disks,
-				   data_offset,
-				   reshape.min_offset_change)) {
+	if (!backup_file)
+		switch(set_new_data_offset(sra, st, devname, info->delta_disks,
+					   data_offset,
+					   reshape.min_offset_change)) {
 	case -1:
 		goto release;
 	case 0: