allow mkfs arguments to be passed from the env for testing multiple

block sizes.

common.rc

@@ -63,7 +63,7 @@ FSSTRESS_AVOID="-f resvsp=0 -f unresvsp=0"
 
 export AWK_PROG PS_HAVE_BSD PS_ALL_FLAGS PLATFORM
 
-# we override mount so we can specify mount options
+# we override mount and mkfs.xfs so we can specify extra options
 
 mount()
 {
@@ -84,6 +84,11 @@ mount()
     esac
 }
 
+mkfs_xfs()
+{
+    /sbin/mkfs.xfs $* $MKFS_OPTIONS
+}
+
 #
 
 _get_pids_by_name()
@@ -606,7 +611,7 @@ then
 
 fi
 
-# check for some required biunaries on our $PATH
+# check for some required binaries on our $PATH
 #
 for exec in mkfs.xfs xfs_logprint xfs_check xfs_repair xfs_db
 do