revert-reshape: only impose reshape_position tests on raid[456]

This test is irrelevant for RAID10, so restrict it to those
levels in which it is meaningful.

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

2 files changed, 14 insertions, 10 deletions

diff --git a/super0.c b/super0.c
index b2019df..e7d86d8 100644
--- a/super0.c
+++ b/super0.c
@@ -650,14 +650,15 @@ static int update_super0(struct supertype *st, struct mdinfo *info,
 			pr_err("No active reshape to revert on %s\n",
 			       devname);
 		else if (sb->delta_disks == 0)
-			pr_err("%s: Can on revert reshape which changes number of devices\n",
+			pr_err("%s: Can only revert reshape which changes number of devices\n",
 			       devname);
 		else {
 			int tmp;
 			int parity = sb->level == 6 ? 2 : 1;
 			rv = 0;
 
-			if (sb->reshape_position % (
+			if (sb->level >= 4 && sb->level <= 6 &&
+			    sb->reshape_position % (
 				    sb->new_chunk/512 *
 				    (sb->raid_disks - sb->delta_disks - parity))) {
 				pr_err("Reshape position is not suitably aligned.\n");
diff --git a/super1.c b/super1.c
index b6e1e91..0427205 100644
--- a/super1.c
+++ b/super1.c
@@ -1276,14 +1276,17 @@ static int update_super1(struct supertype *st, struct mdinfo *info,
 			 * So we reject a revert-reshape unless the
 			 * alignment is good.
 			 */
-			reshape_sectors = __le64_to_cpu(sb->reshape_position);
-			reshape_chunk = __le32_to_cpu(sb->new_chunk);
-			reshape_chunk *= __le32_to_cpu(sb->raid_disks) - __le32_to_cpu(sb->delta_disks) -
-				(__le32_to_cpu(sb->level)==6 ? 2 : 1);
-			if (reshape_sectors % reshape_chunk) {
-				pr_err("Reshape position is not suitably aligned.\n");
-				pr_err("Try normal assembly as stop again\n");
-				return -2;
+			if (__le32_to_cpu(sb->level) >= 4 &&
+			    __le32_to_cpu(sb->level) <= 6) {
+				reshape_sectors = __le64_to_cpu(sb->reshape_position);
+				reshape_chunk = __le32_to_cpu(sb->new_chunk);
+				reshape_chunk *= __le32_to_cpu(sb->raid_disks) - __le32_to_cpu(sb->delta_disks) -
+					(__le32_to_cpu(sb->level)==6 ? 2 : 1);
+				if (reshape_sectors % reshape_chunk) {
+					pr_err("Reshape position is not suitably aligned.\n");
+					pr_err("Try normal assembly as stop again\n");
+					return -2;
+				}
 			}
 			sb->raid_disks = __cpu_to_le32(__le32_to_cpu(sb->raid_disks) -
 						       __le32_to_cpu(sb->delta_disks));