From 9ad2a640fe8579659455ef51b1fa40ea532e865f Mon Sep 17 00:00:00 2001
From: NeilBrown <neilb@suse.de>
Date: Tue, 21 May 2013 16:35:29 +1000
Subject: [PATCH] Grow: handle E2BIG from new_offset changes more gracefully.

If new_offset change is too big, just do the reshape the old way.

Signed-off-by: NeilBrown <neilb@suse.de>
---
 Grow.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/Grow.c b/Grow.c
index 3277649..5d35e32 100644
--- a/Grow.c
+++ b/Grow.c
@@ -2288,8 +2288,11 @@ static int set_new_data_offset(struct mdinfo *sra, struct supertype *st,
 		if (sysfs_set_num(sra, sd, "new_offset",
 				  info2.new_data_offset) < 0) {
 			err = errno;
-			if (sd == sra->devs && err == ENOENT)
-				/* Early kernel, no 'new_offset' file.
+			err = -1;
+			if (sd == sra->devs &&
+			    (errno == ENOENT || errno == E2BIG))
+				/* Early kernel, no 'new_offset' file,
+				 * or kernel doesn't like us.
 				 * For RAID5/6 this is not fatal
 				 */
 				return 1;