diff --git a/include/asm-s390/dasd.h b/include/asm-s390/dasd.h
new file mode 100644
index 0000000..77b10d6
--- /dev/null
+++ b/include/asm-s390/dasd.h
@@ -0,0 +1,268 @@
+/* 
+ * File...........: linux/drivers/s390/block/dasd.c
+ * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
+ * Bugreports.to..: <Linux390@de.ibm.com>
+ * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
+ *
+ * This file is the interface of the DASD device driver, which is exported to user space
+ * any future changes wrt the API will result in a change of the APIVERSION reported
+ * to userspace by the DASDAPIVER-ioctl
+ *
+ * $Revision: 1.6 $
+ *
+ */
+
+#ifndef DASD_H
+#define DASD_H
+#include <linux/ioctl.h>
+
+#define DASD_IOCTL_LETTER 'D'
+
+#define DASD_API_VERSION 6
+
+/* 
+ * struct dasd_information2_t
+ * represents any data about the device, which is visible to userspace.
+ *  including foramt and featueres.
+ */
+typedef struct dasd_information2_t {
+        unsigned int devno;         /* S/390 devno */
+        unsigned int real_devno;    /* for aliases */
+        unsigned int schid;         /* S/390 subchannel identifier */
+        unsigned int cu_type  : 16; /* from SenseID */
+        unsigned int cu_model :  8; /* from SenseID */
+        unsigned int dev_type : 16; /* from SenseID */
+        unsigned int dev_model : 8; /* from SenseID */
+        unsigned int open_count; 
+        unsigned int req_queue_len; 
+        unsigned int chanq_len;     /* length of chanq */
+        char type[4];               /* from discipline.name, 'none' for unknown */
+        unsigned int status;        /* current device level */
+        unsigned int label_block;   /* where to find the VOLSER */
+        unsigned int FBA_layout;    /* fixed block size (like AIXVOL) */
+        unsigned int characteristics_size;
+        unsigned int confdata_size;
+        char characteristics[64];   /* from read_device_characteristics */
+        char configuration_data[256]; /* from read_configuration_data */
+        unsigned int format;          /* format info like formatted/cdl/ldl/... */
+        unsigned int features;        /* dasd features like 'ro',...            */
+        unsigned int reserved0;       /* reserved for further use ,...          */
+        unsigned int reserved1;       /* reserved for further use ,...          */
+        unsigned int reserved2;       /* reserved for further use ,...          */
+        unsigned int reserved3;       /* reserved for further use ,...          */
+        unsigned int reserved4;       /* reserved for further use ,...          */
+        unsigned int reserved5;       /* reserved for further use ,...          */
+        unsigned int reserved6;       /* reserved for further use ,...          */
+        unsigned int reserved7;       /* reserved for further use ,...          */
+} dasd_information2_t;
+
+/*
+ * values to be used for dasd_information_t.format
+ * 0x00: NOT formatted
+ * 0x01: Linux disc layout
+ * 0x02: Common disc layout
+ */
+#define DASD_FORMAT_NONE 0
+#define DASD_FORMAT_LDL  1
+#define DASD_FORMAT_CDL  2
+/*
+ * values to be used for dasd_information_t.features
+ * 0x00: default features
+ * 0x01: readonly (ro)
+ * 0x02: use diag discipline (diag)
+ */
+#define DASD_FEATURE_DEFAULT  0
+#define DASD_FEATURE_READONLY 1
+#define DASD_FEATURE_USEDIAG  2
+
+#define DASD_PARTN_BITS 2
+
+/* 
+ * struct dasd_information_t
+ * represents any data about the data, which is visible to userspace
+ */
+typedef struct dasd_information_t {
+        unsigned int devno;         /* S/390 devno */
+        unsigned int real_devno;    /* for aliases */
+        unsigned int schid;         /* S/390 subchannel identifier */
+        unsigned int cu_type  : 16; /* from SenseID */
+        unsigned int cu_model :  8; /* from SenseID */
+        unsigned int dev_type : 16; /* from SenseID */
+        unsigned int dev_model : 8; /* from SenseID */
+        unsigned int open_count; 
+        unsigned int req_queue_len; 
+        unsigned int chanq_len;     /* length of chanq */
+        char type[4];               /* from discipline.name, 'none' for unknown */
+        unsigned int status;        /* current device level */
+        unsigned int label_block;   /* where to find the VOLSER */
+        unsigned int FBA_layout;    /* fixed block size (like AIXVOL) */
+        unsigned int characteristics_size;
+        unsigned int confdata_size;
+        char characteristics[64];   /* from read_device_characteristics */
+        char configuration_data[256]; /* from read_configuration_data */
+} dasd_information_t;
+
+/*
+ * Read Subsystem Data - Perfomance Statistics
+ */ 
+typedef struct dasd_rssd_perf_stats_t {
+	unsigned char  invalid:1;
+	unsigned char  format:3;
+	unsigned char  data_format:4;
+	unsigned char  unit_address;
+	unsigned short device_status;
+	unsigned int   nr_read_normal;
+	unsigned int   nr_read_normal_hits;
+	unsigned int   nr_write_normal;
+	unsigned int   nr_write_fast_normal_hits;
+	unsigned int   nr_read_seq;
+	unsigned int   nr_read_seq_hits;
+	unsigned int   nr_write_seq;
+	unsigned int   nr_write_fast_seq_hits;
+	unsigned int   nr_read_cache;
+	unsigned int   nr_read_cache_hits;
+	unsigned int   nr_write_cache;
+	unsigned int   nr_write_fast_cache_hits;
+	unsigned int   nr_inhibit_cache;
+	unsigned int   nr_bybass_cache;
+	unsigned int   nr_seq_dasd_to_cache;
+	unsigned int   nr_dasd_to_cache;
+	unsigned int   nr_cache_to_dasd;
+	unsigned int   nr_delayed_fast_write;
+	unsigned int   nr_normal_fast_write;
+	unsigned int   nr_seq_fast_write;
+	unsigned int   nr_cache_miss;
+	unsigned char  status2;
+	unsigned int   nr_quick_write_promotes;
+	unsigned char  reserved;
+	unsigned short ssid;
+	unsigned char  reseved2[96];
+} __attribute__((packed)) dasd_rssd_perf_stats_t;
+
+/* 
+ * struct profile_info_t
+ * holds the profinling information 
+ */
+typedef struct dasd_profile_info_t {
+        unsigned int dasd_io_reqs;	 /* number of requests processed at all */
+        unsigned int dasd_io_sects;	 /* number of sectors processed at all */
+        unsigned int dasd_io_secs[32];	 /* histogram of request's sizes */
+        unsigned int dasd_io_times[32];	 /* histogram of requests's times */
+        unsigned int dasd_io_timps[32];	 /* histogram of requests's times per sector */
+        unsigned int dasd_io_time1[32];	 /* histogram of time from build to start */
+        unsigned int dasd_io_time2[32];	 /* histogram of time from start to irq */
+        unsigned int dasd_io_time2ps[32]; /* histogram of time from start to irq */
+        unsigned int dasd_io_time3[32];	 /* histogram of time from irq to end */
+        unsigned int dasd_io_nr_req[32]; /* histogram of # of requests in chanq */
+} dasd_profile_info_t;
+
+/* 
+ * struct format_data_t
+ * represents all data necessary to format a dasd
+ */
+typedef struct format_data_t {
+	int start_unit; /* from track */
+	int stop_unit;  /* to track */
+	int blksize;    /* sectorsize */
+        int intensity;  
+} format_data_t;
+
+/*
+ * values to be used for format_data_t.intensity
+ * 0/8: normal format
+ * 1/9: also write record zero
+ * 3/11: also write home address
+ * 4/12: invalidate track
+ */
+#define DASD_FMT_INT_FMT_R0 1 /* write record zero */
+#define DASD_FMT_INT_FMT_HA 2 /* write home address, also set FMT_R0 ! */
+#define DASD_FMT_INT_INVAL  4 /* invalidate tracks */
+#define DASD_FMT_INT_COMPAT 8 /* use OS/390 compatible disk layout */
+
+
+/* 
+ * struct attrib_data_t
+ * represents the operation (cache) bits for the device.
+ * Used in DE to influence caching of the DASD.
+ */
+typedef struct attrib_data_t {
+	unsigned char operation:3;     /* cache operation mode */
+	unsigned char reserved:5;      /* cache operation mode */
+	__u16         nr_cyl;          /* no of cyliners for read ahaed */
+	__u8          reserved2[29];   /* for future use */
+} __attribute__ ((packed)) attrib_data_t;
+
+/* definition of operation (cache) bits within attributes of DE */
+#define DASD_NORMAL_CACHE  0x0
+#define DASD_BYPASS_CACHE  0x1
+#define DASD_INHIBIT_LOAD  0x2
+#define DASD_SEQ_ACCESS    0x3
+#define DASD_SEQ_PRESTAGE  0x4
+#define DASD_REC_ACCESS    0x5
+
+
+/********************************************************************************
+ * SECTION: Definition of IOCTLs
+ *
+ * Here ist how the ioctl-nr should be used:
+ *    0 -   31   DASD driver itself
+ *   32 -  239   still open
+ *  240 -  255   reserved for EMC 
+ *******************************************************************************/
+
+/* Disable the volume (for Linux) */
+#define BIODASDDISABLE _IO(DASD_IOCTL_LETTER,0) 
+/* Enable the volume (for Linux) */
+#define BIODASDENABLE  _IO(DASD_IOCTL_LETTER,1)  
+/* Issue a reserve/release command, rsp. */
+#define BIODASDRSRV    _IO(DASD_IOCTL_LETTER,2) /* reserve */
+#define BIODASDRLSE    _IO(DASD_IOCTL_LETTER,3) /* release */
+#define BIODASDSLCK    _IO(DASD_IOCTL_LETTER,4) /* steal lock */
+/* reset profiling information of a device */
+#define BIODASDPRRST   _IO(DASD_IOCTL_LETTER,5)
+/* Quiesce IO on device */
+#define BIODASDQUIESCE _IO(DASD_IOCTL_LETTER,6) 
+/* Resume IO on device */
+#define BIODASDRESUME  _IO(DASD_IOCTL_LETTER,7) 
+
+
+/* retrieve API version number */
+#define DASDAPIVER     _IOR(DASD_IOCTL_LETTER,0,int)
+/* Get information on a dasd device */
+#define BIODASDINFO    _IOR(DASD_IOCTL_LETTER,1,dasd_information_t)
+/* retrieve profiling information of a device */
+#define BIODASDPRRD    _IOR(DASD_IOCTL_LETTER,2,dasd_profile_info_t)
+/* Get information on a dasd device (enhanced) */
+#define BIODASDINFO2   _IOR(DASD_IOCTL_LETTER,3,dasd_information2_t)
+/* Performance Statistics Read */
+#define BIODASDPSRD    _IOR(DASD_IOCTL_LETTER,4,dasd_rssd_perf_stats_t)
+/* Get Attributes (cache operations) */
+#define BIODASDGATTR   _IOR(DASD_IOCTL_LETTER,5,attrib_data_t) 
+
+
+/* #define BIODASDFORMAT  _IOW(IOCTL_LETTER,0,format_data_t) , deprecated */
+#define BIODASDFMT     _IOW(DASD_IOCTL_LETTER,1,format_data_t) 
+/* Set Attributes (cache operations) */
+#define BIODASDSATTR   _IOW(DASD_IOCTL_LETTER,2,attrib_data_t) 
+
+
+#endif				/* DASD_H */
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-indent-level: 4 
+ * c-brace-imaginary-offset: 0
+ * c-brace-offset: -4
+ * c-argdecl-indent: 4
+ * c-label-offset: -4
+ * c-continued-statement-offset: 4
+ * c-continued-brace-offset: 0
+ * indent-tabs-mode: nil
+ * tab-width: 8
+ * End:
+ */