DAOS-17591 object: refresh DTX MBS for case being changed

During DTX preparing, if some related target is evicted for some reason,
then the in processing DTX maybe failed and related client will resend
the RPC with new DTX MBS (participants) information based on new pool
map. On the other hand, the DTX on other healthy targets may has been
prepared with old MBS information. Under such case, related RPC handler
on server needs to process the resent RPC and refresh related DTX's MBS
information (and the pool map version, flags if DTX leader is switched).
Then the subsequent DTX RPC (such as commit, abort, check and refresh)
can be sent to the right targets/participants.

Signed-off-by: Fan Yong <[email protected]>

Author: Nasf-Fan

src/include/daos_srv/vos.h

@@ -163,6 +163,23 @@ int
 vos_dtx_load_mbs(daos_handle_t coh, struct dtx_id *dti, daos_unit_oid_t *oid,
 		 struct dtx_memberships **mbs);
 
+/**
+ * Refresh participants information and pool map version for the given DTX.
+ *
+ * \param coh		[IN]	Container open handle.
+ * \param dti		[IN]	Pointer to the DTX identifier.
+ * \param mbs		[IN]	Pointer to the DTX participants information.
+ * \param pm_ver	[IN]	Pool map version for the new DTX participants information.
+ * \param leader	[IN]	Is DTX leader or not.
+ *
+ * \return		Zero on success.
+ *			Positive if changed nothing.
+ *			Negative value if error.
+ */
+int
+vos_dtx_refresh_mbs(daos_handle_t coh, struct dtx_id *dti, struct dtx_memberships *mbs,
+		    uint32_t pm_ver, bool leader);
+
 /**
  * Commit the specified DTXs.
  *