scsi: target: core: Check emulate_3pc for RECEIVE COPY

RECEIVE COPY RESULTS is an opcode from 3rd party copy command set and shall
be rejected if emulate_3pc attribute is off like EXTENDED COPY.
Reviewed-by: Roman Bolshakov <r.bolshakov@yadro.com>
Signed-off-by: Dmitry Bogdanov <d.bogdanov@yadro.com>
Link: https://lore.kernel.org/r/20220906103421.22348-6-d.bogdanov@yadro.comReviewed-by: Mike Christie <michael.christie@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/target/target_core_xcopy.c

@@ -1009,8 +1009,14 @@ sense_reason_t target_do_receive_copy_results(struct se_cmd *se_cmd)
 {
 	unsigned char *cdb = &se_cmd->t_task_cdb[0];
 	int sa = (cdb[1] & 0x1f), list_id = cdb[2];
+	struct se_device *dev = se_cmd->se_dev;
 	sense_reason_t rc = TCM_NO_SENSE;
 
+	if (!dev->dev_attrib.emulate_3pc) {
+		pr_debug("Third-party copy operations explicitly disabled\n");
+		return TCM_UNSUPPORTED_SCSI_OPCODE;
+	}
+
 	pr_debug("Entering target_do_receive_copy_results: SA: 0x%02x, List ID:"
 		" 0x%02x, AL: %u\n", sa, list_id, se_cmd->data_length);