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diff --git a/module/zpios/include/zpios-internal.h b/module/zpios/include/zpios-internal.h
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+++ b/module/zpios/include/zpios-internal.h
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+/*****************************************************************************\
+ *  ZPIOS is a heavily modified version of the original PIOS test code.
+ *  It is designed to have the test code running in the Linux kernel
+ *  against ZFS while still being flexibly controled from user space.
+ *
+ *  Copyright (C) 2008-2010 Lawrence Livermore National Security, LLC.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Brian Behlendorf <behlendorf1@llnl.gov>.
+ *  LLNL-CODE-403049
+ *
+ *  Original PIOS Test Code
+ *  Copyright (C) 2004 Cluster File Systems, Inc.
+ *  Written by Peter Braam <braam@clusterfs.com>
+ *             Atul Vidwansa <atul@clusterfs.com>
+ *             Milind Dumbare <milind@clusterfs.com>
+ *
+ *  This file is part of ZFS on Linux.
+ *  For details, see <http://github.com/behlendorf/zfs/>.
+ *
+ *  ZPIOS is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  ZPIOS is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with ZPIOS.  If not, see <http://www.gnu.org/licenses/>.
+\*****************************************************************************/
+
+#ifndef _ZPIOS_INTERNAL_H
+#define _ZPIOS_INTERNAL_H
+
+#include "zpios-ctl.h"
+
+#define OBJ_SIZE	64
+
+struct run_args;
+
+typedef struct dmu_obj {
+	objset_t *os;
+	uint64_t obj;
+} dmu_obj_t;
+
+/* thread doing the IO data */
+typedef struct thread_data {
+	struct run_args *run_args;
+	int thread_no;
+	int rc;
+	zpios_stats_t stats;
+        kmutex_t lock;
+} thread_data_t;
+
+/* region for IO data */
+typedef struct zpios_region {
+	__u64 wr_offset;
+	__u64 rd_offset;
+	__u64 init_offset;
+	__u64 max_offset;
+	dmu_obj_t obj;
+	zpios_stats_t stats;
+        kmutex_t lock;
+} zpios_region_t;
+
+/* arguments for one run */
+typedef struct run_args {
+	/* Config args */
+	int id;
+	char pool[ZPIOS_NAME_SIZE];
+	__u64 chunk_size;
+	__u32 thread_count;
+	__u32 region_count;
+	__u64 region_size;
+	__u64 offset;
+	__u32 region_noise;
+	__u32 chunk_noise;
+	__u32 thread_delay;
+	__u32 flags;
+	char pre[ZPIOS_PATH_SIZE];
+	char post[ZPIOS_PATH_SIZE];
+	char log[ZPIOS_PATH_SIZE];
+
+	/* Control data */
+	objset_t *os;
+        wait_queue_head_t waitq;
+	volatile uint64_t threads_done;
+        kmutex_t lock_work;
+	kmutex_t lock_ctl;
+	__u32 region_next;
+
+	/* Results data */
+	struct file *file;
+	zpios_stats_t stats;
+
+	thread_data_t **threads;
+	zpios_region_t regions[0]; /* Must be last element */
+} run_args_t;
+
+#define ZPIOS_INFO_BUFFER_SIZE          65536
+#define ZPIOS_INFO_BUFFER_REDZONE       1024
+
+typedef struct zpios_info {
+        spinlock_t info_lock;
+        int info_size;
+        char *info_buffer;
+        char *info_head;        /* Internal kernel use only */
+} zpios_info_t;
+
+#define zpios_print(file, format, args...)                              \
+({      zpios_info_t *_info_ = (zpios_info_t *)file->private_data;      \
+        int _rc_;                                                       \
+                                                                        \
+        ASSERT(_info_);                                                 \
+        ASSERT(_info_->info_buffer);                                    \
+                                                                        \
+        spin_lock(&_info_->info_lock);                                  \
+                                                                        \
+        /* Don't allow the kernel to start a write in the red zone */   \
+        if ((int)(_info_->info_head - _info_->info_buffer) >            \
+            (_info_->info_size - ZPIOS_INFO_BUFFER_REDZONE))      {     \
+                _rc_ = -EOVERFLOW;                                      \
+        } else {                                                        \
+                _rc_ = sprintf(_info_->info_head, format, args);        \
+                if (_rc_ >= 0)                                          \
+                        _info_->info_head += _rc_;                      \
+        }                                                               \
+                                                                        \
+        spin_unlock(&_info_->info_lock);                                \
+        _rc_;                                                           \
+})
+
+#define zpios_vprint(file, test, format, args...)                       \
+        zpios_print(file, "%*s: " format, ZPIOS_NAME_SIZE, test, args)
+
+#endif /* _ZPIOS_INTERNAL_H */