[PATCH] Make sure update_super returns correct value.

For 'force' and 'assemble', update_super must return true
if anything was changed.

Also fix a bug with wonly handling in super0.

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

### Diffstat output
 ./super0.c |   18 ++++++++++++++----
 ./super1.c |    7 +++++++
 2 files changed, 21 insertions(+), 4 deletions(-)

diff ./super0.c~current~ ./super0.c

1 files changed, 7 insertions, 0 deletions

diff --git a/super1.c b/super1.c
index 27cec87..1ab0776 100644
--- a/super1.c
+++ b/super1.c
@@ -423,14 +423,21 @@ static void getinfo_super1(struct mdinfo *info, void *sbv)
 
 static int update_super1(struct mdinfo *info, void *sbv, char *update, char *devname, int verbose)
 {
+	/* NOTE: for 'assemble' and 'force' we need to return non-zero if any change was made.
+	 * For others, the return value is ignored.
+	 */
 	int rv = 0;
 	struct mdp_superblock_1 *sb = sbv;
 
 	if (strcmp(update, "force")==0) {
+		if (sb->events != __cpu_to_le64(info->events))
+			rv = 1;
 		sb->events = __cpu_to_le64(info->events);
 		switch(__le32_to_cpu(sb->level)) {
 		case 5: case 4: case 6:
 			/* need to force clean */
+			if (sb->resync_offset != ~0ULL)
+				rv = 1;
 			sb->resync_offset = ~0ULL;
 		}
 	}