[XFS] Fix an assert in log init code

SGI Modid: 2.5.x-xfs:slinx:149646a

fs/xfs/xfs_log.c

@@ -1207,7 +1207,10 @@ xlog_alloc_log(xfs_mount_t	*mp,
 	if (XFS_SB_VERSION_HASSECTOR(&mp->m_sb)) {
 		log->l_sectbb_log = mp->m_sb.sb_logsectlog - BBSHIFT;
 		ASSERT(log->l_sectbb_log <= mp->m_sectbb_log);
-		ASSERT(XFS_SB_VERSION_HASLOGV2(&mp->m_sb));
+		/* for larger sector sizes, must have v2 or external log */
+		ASSERT(log->l_sectbb_log == 0 ||
+			log->l_logBBstart == 0 ||
+			XFS_SB_VERSION_HASLOGV2(&mp->m_sb));
 		ASSERT(mp->m_sb.sb_logsectlog >= BBSHIFT);
 	}
 	log->l_sectbb_mask = (1 << log->l_sectbb_log) - 1;