[PATCH] fsync on unmounting root

[Chris Mason]

Hi guys,

Looks like the prerelease, and at least test13 don't fsync the device when
someone does an unmount on /

mount -o remount works, just unmounting the root misses the fsync.

This patch works for me:

-chris

--- linux/fs/super.c.1	Thu Jan  4 13:38:55 2001
+++ linux/fs/super.c	Thu Jan  4 13:38:39 2001
@@ -1031,8 +1031,12 @@
 		 * we just try to remount it readonly.
 		 */
 		mntput(mnt);
-		if (!(sb->s_flags & MS_RDONLY)) 
+		if (!(sb->s_flags & MS_RDONLY)) {
+			shrink_dcache_sb(sb);
+			fsync_dev(sb->s_dev);
+			acct_auto_close(sb->s_dev);
 			retval = do_remount_sb(sb, MS_RDONLY, 0);
+		}
 		return retval;
 	}