From 6041dcd1367b099aa88e3dc6f9293c98fefaeef3 Mon Sep 17 00:00:00 2001
From: Ronnie Sahlberg <ronniesahlberg@gmail.com>
Date: Sun, 4 Aug 2013 13:12:13 -0700
Subject: [PATCH] Add a new function to create a scsi_task using an existing
 CDB

---
 include/scsi-lowlevel.h |  7 +++++++
 lib/libiscsi.def        |  1 +
 lib/libiscsi.syms       |  1 +
 lib/scsi-lowlevel.c     | 20 ++++++++++++++++++++
 4 files changed, 29 insertions(+)

diff --git a/include/scsi-lowlevel.h b/include/scsi-lowlevel.h
index da2278a..90841b1 100644
--- a/include/scsi-lowlevel.h
+++ b/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.
diff --git a/lib/libiscsi.def b/lib/libiscsi.def
index bf68dbf..5695b94 100644
--- a/lib/libiscsi.def
+++ b/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
diff --git a/lib/libiscsi.syms b/lib/libiscsi.syms
index e887506..685a168 100644
--- a/lib/libiscsi.syms
+++ b/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
diff --git a/lib/scsi-lowlevel.c b/lib/scsi-lowlevel.c
index 1bb03af..d766772 100644
--- a/lib/scsi-lowlevel.c
+++ b/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)
 {