Grow: only warn about incompatible metadata when no fallback available.

We might be trying to set_new_data_offset() for RAID10, when it is
a necessary requirement, or for RAID5 where it is optional.
In the latter case, a message about metadata versions is no helpful.

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

1 files changed, 3 insertions, 1 deletions

diff --git a/Grow.c b/Grow.c
index 9a573fd..568e399 100644
--- a/Grow.c
+++ b/Grow.c
@@ -2213,7 +2213,9 @@ static int set_new_data_offset(struct mdinfo *sra, struct supertype *st,
 		if (info2.space_before == 0 &&
 		    info2.space_after == 0) {
 			/* Metadata doesn't support data_offset changes */
-			pr_err("%s: Metadata version doesn't support data_offset changes\n", devname);
+			if (!can_fallback)
+				pr_err("%s: Metadata version doesn't support data_offset changes\n",
+				       devname);
 			goto fallback;
 		}
 		if (before > info2.space_before)