Add a new function to create a scsi_task using an existing CDB

include/scsi-lowlevel.h

@@ -292,6 +292,13 @@ struct scsi_task {
 	struct scsi_iovector iovector_out;
 };
 
+
+/* Create a task using a pre-built CDB which can later be passed to
+   iscsi_scsi_command_[a]sync()
+ */
+EXTERN struct scsi_task *scsi_create_task(int cdb_size, unsigned char *cdb,
+       int xfer_dir, int expxferlen);
+
 /* This function will free a scsi task structure.
    You may NOT cancel a task until the callback has been invoked
    and the command has completed on the transport layer.

lib/libiscsi.def

@@ -196,6 +196,7 @@ scsi_cdb_writeverify16
 scsi_cdb_writesame10
 scsi_cdb_writesame16
 scsi_codeset_to_str
+scsi_create_task
 scsi_datain_getfullsize
 scsi_datain_unmarshall
 scsi_cdb_unmarshall

lib/libiscsi.syms

@@ -194,6 +194,7 @@ scsi_cdb_writeverify16
 scsi_cdb_writesame10
 scsi_cdb_writesame16
 scsi_codeset_to_str
+scsi_create_task
 scsi_datain_getfullsize
 scsi_datain_unmarshall
 scsi_cdb_unmarshall

lib/scsi-lowlevel.c

@@ -73,6 +73,26 @@ scsi_free_scsi_task(struct scsi_task *task)
 	free(task);
 }
 
+struct scsi_task *
+scsi_create_task(int cdb_size, unsigned char *cdb, int xfer_dir, int expxferlen)
+{
+	struct scsi_task *task;
+
+	task = malloc(sizeof(struct scsi_task));
+	if (task == NULL) {
+		return NULL;
+	}
+
+	memset(task, 0, sizeof(struct scsi_task));
+
+	memcpy(&task->cdb[0], cdb, cdb_size);
+	task->xfer_dir   = xfer_dir;
+	task->expxferlen = expxferlen;
+
+	return task;
+}
+
+
 void *
 scsi_malloc(struct scsi_task *task, size_t size)
 {