Libiscsi: add support for RECEIVE COPY RESULTS

Build on existing scsi_cdb_receive_copy_results() functionality. This
request is most commonly used to determine target-side EXTENDED COPY
operational parameters.

Signed-off-by: David Disseldorp <ddiss@suse.de>

include/iscsi.h

@@ -1129,6 +1129,11 @@ iscsi_report_supported_opcodes_task(struct iscsi_context *iscsi, int lun,
 				    uint32_t alloc_len,
 				    iscsi_command_cb cb, void *private_data);
 
+EXTERN struct scsi_task *
+iscsi_receive_copy_results_task(struct iscsi_context *iscsi, int lun,
+				int sa, int list_id, int alloc_len,
+				iscsi_command_cb cb, void *private_data);
+
 /*
  * Sync commands for SCSI
  */
@@ -1454,6 +1459,10 @@ iscsi_report_supported_opcodes_sync(struct iscsi_context *iscsi, int lun,
 				    int opcode, int sa,
 				    uint32_t alloc_len);
 
+EXTERN struct scsi_task *
+iscsi_receive_copy_results_sync(struct iscsi_context *iscsi, int lun,
+				int sa, int list_id, int alloc_len);
+
 /*
  * These functions are used when the application wants to specify its own buffers to read the data
  * from the DATA-IN PDUs into, or write the data to DATA-OUT PDUs from.

lib/iscsi-command.c

@@ -2611,6 +2611,29 @@ iscsi_report_supported_opcodes_task(struct iscsi_context *iscsi, int lun,
 	return task;
 }
 
+struct scsi_task *
+iscsi_receive_copy_results_task(struct iscsi_context *iscsi, int lun,
+				int sa, int list_id, int alloc_len,
+				iscsi_command_cb cb, void *private_data)
+{
+	struct scsi_task *task;
+
+	task = scsi_cdb_receive_copy_results(sa, list_id, alloc_len);
+	if (task == NULL) {
+		iscsi_set_error(iscsi, "Out-of-memory: Failed to create "
+				"RECEIVE COPY RESULTS cdb.");
+		return NULL;
+	}
+
+	if (iscsi_scsi_command_async(iscsi, lun, task, cb,
+				     NULL, private_data) != 0) {
+		scsi_free_scsi_task(task);
+		return NULL;
+	}
+
+	return task;
+}
+
 struct scsi_task *
 iscsi_scsi_get_task_from_pdu(struct iscsi_pdu *pdu)
 {

lib/libiscsi.def

@@ -83,6 +83,8 @@ iscsi_release6_sync
 iscsi_release6_task
 iscsi_report_supported_opcodes_sync
 iscsi_report_supported_opcodes_task
+iscsi_receive_copy_results_sync
+iscsi_receive_copy_results_task
 iscsi_reconnect
 iscsi_sanitize_sync
 iscsi_sanitize_task

lib/libiscsi.syms

@@ -81,6 +81,8 @@ iscsi_release6_sync
 iscsi_release6_task
 iscsi_report_supported_opcodes_sync
 iscsi_report_supported_opcodes_task
+iscsi_receive_copy_results_sync
+iscsi_receive_copy_results_task
 iscsi_reconnect
 iscsi_sanitize_sync
 iscsi_sanitize_task

lib/sync.c

@@ -1667,6 +1667,26 @@ iscsi_report_supported_opcodes_sync(struct iscsi_context *iscsi, int lun,
 	return state.task;
 }
 
+struct scsi_task *
+iscsi_receive_copy_results_sync(struct iscsi_context *iscsi, int lun,
+				int sa, int list_id, int alloc_len)
+{
+	struct iscsi_sync_state state;
+
+	memset(&state, 0, sizeof(state));
+
+	if (iscsi_receive_copy_results_task(iscsi, lun, sa, list_id, alloc_len,
+					    scsi_sync_cb, &state) == NULL) {
+		iscsi_set_error(iscsi, "Failed to send RECEIVE COPY RESULTS"
+				" command");
+		return NULL;
+	}
+
+	event_loop(iscsi, &state);
+
+	return state.task;
+}
+
 struct scsi_task *
 iscsi_scsi_command_sync(struct iscsi_context *iscsi, int lun,
 			struct scsi_task *task, struct iscsi_data *data)