diff -r 505cf41488a4 -r 9cdd7669dc0b master/fsm_soe.h
--- a/master/fsm_soe.h	Thu Jan 10 12:34:58 2013 +0100
+++ b/master/fsm_soe.h	Thu Jan 10 17:36:41 2013 +0100
@@ -50,24 +50,25 @@
  */
 struct ec_fsm_soe {
     ec_slave_t *slave; /**< slave the FSM runs on */
-    ec_datagram_t *datagram; /**< datagram used in the state machine */
     unsigned int retries; /**< retries upon datagram timeout */
 
-    void (*state)(ec_fsm_soe_t *); /**< CoE state function */
-    unsigned long jiffies_start; /**< CoE timestamp. */
+    void (*state)(ec_fsm_soe_t *, ec_datagram_t *); /**< CoE state function */
+    ec_datagram_t *datagram; /**< Datagram used in the previous step. */
+    unsigned long jiffies_start; /**< Timestamp. */
     ec_soe_request_t *request; /**< SoE request */
     off_t offset; /**< IDN data offset during fragmented write. */
+    size_t fragment_size; /**< Size of the current fragment. */
 };
 
 /*****************************************************************************/
 
-void ec_fsm_soe_init(ec_fsm_soe_t *, ec_datagram_t *);
+void ec_fsm_soe_init(ec_fsm_soe_t *);
 void ec_fsm_soe_clear(ec_fsm_soe_t *);
 
 void ec_fsm_soe_transfer(ec_fsm_soe_t *, ec_slave_t *, ec_soe_request_t *);
 
-int ec_fsm_soe_exec(ec_fsm_soe_t *);
-int ec_fsm_soe_success(ec_fsm_soe_t *);
+int ec_fsm_soe_exec(ec_fsm_soe_t *, ec_datagram_t *);
+int ec_fsm_soe_success(const ec_fsm_soe_t *);
 
 /*****************************************************************************/