diff --git a/drivers/scsi/osst.h b/drivers/scsi/osst.h
new file mode 100644
index 0000000..b72e1c7
--- /dev/null
+++ b/drivers/scsi/osst.h
@@ -0,0 +1,638 @@
+/*
+ *	$Header: /cvsroot/osst/Driver/osst.h,v 1.16 2005/01/01 21:13:35 wriede Exp $
+ */
+
+#include <asm/byteorder.h>
+#include <linux/config.h>
+#include <linux/completion.h>
+
+/*	FIXME - rename and use the following two types or delete them!
+ *              and the types really should go to st.h anyway...
+ *	INQUIRY packet command - Data Format (From Table 6-8 of QIC-157C)
+ */
+typedef struct {
+	unsigned	device_type	:5;	/* Peripheral Device Type */
+	unsigned	reserved0_765	:3;	/* Peripheral Qualifier - Reserved */
+	unsigned	reserved1_6t0	:7;	/* Reserved */
+	unsigned	rmb		:1;	/* Removable Medium Bit */
+	unsigned	ansi_version	:3;	/* ANSI Version */
+	unsigned	ecma_version	:3;	/* ECMA Version */
+	unsigned	iso_version	:2;	/* ISO Version */
+	unsigned	response_format :4;	/* Response Data Format */
+	unsigned	reserved3_45	:2;	/* Reserved */
+	unsigned	reserved3_6	:1;	/* TrmIOP - Reserved */
+	unsigned	reserved3_7	:1;	/* AENC - Reserved */
+	u8		additional_length;	/* Additional Length (total_length-4) */
+	u8		rsv5, rsv6, rsv7;	/* Reserved */
+	u8		vendor_id[8];		/* Vendor Identification */
+	u8		product_id[16];		/* Product Identification */
+	u8		revision_level[4];	/* Revision Level */
+	u8		vendor_specific[20];	/* Vendor Specific - Optional */
+	u8		reserved56t95[40];	/* Reserved - Optional */
+						/* Additional information may be returned */
+} idetape_inquiry_result_t;
+
+/*
+ *	READ POSITION packet command - Data Format (From Table 6-57)
+ */
+typedef struct {
+	unsigned	reserved0_10	:2;	/* Reserved */
+	unsigned	bpu		:1;	/* Block Position Unknown */	
+	unsigned	reserved0_543	:3;	/* Reserved */
+	unsigned	eop		:1;	/* End Of Partition */
+	unsigned	bop		:1;	/* Beginning Of Partition */
+	u8		partition;		/* Partition Number */
+	u8		reserved2, reserved3;	/* Reserved */
+	u32		first_block;		/* First Block Location */
+	u32		last_block;		/* Last Block Location (Optional) */
+	u8		reserved12;		/* Reserved */
+	u8		blocks_in_buffer[3];	/* Blocks In Buffer - (Optional) */
+	u32		bytes_in_buffer;	/* Bytes In Buffer (Optional) */
+} idetape_read_position_result_t;
+
+/*
+ *      Follows structures which are related to the SELECT SENSE / MODE SENSE
+ *      packet commands. 
+ */
+#define COMPRESSION_PAGE           0x0f
+#define COMPRESSION_PAGE_LENGTH    16
+
+#define CAPABILITIES_PAGE          0x2a
+#define CAPABILITIES_PAGE_LENGTH   20
+
+#define TAPE_PARAMTR_PAGE          0x2b
+#define TAPE_PARAMTR_PAGE_LENGTH   16
+
+#define NUMBER_RETRIES_PAGE        0x2f
+#define NUMBER_RETRIES_PAGE_LENGTH 4
+
+#define BLOCK_SIZE_PAGE            0x30
+#define BLOCK_SIZE_PAGE_LENGTH     4
+
+#define BUFFER_FILLING_PAGE        0x33
+#define BUFFER_FILLING_PAGE_LENGTH 4
+
+#define VENDOR_IDENT_PAGE          0x36
+#define VENDOR_IDENT_PAGE_LENGTH   8
+
+#define LOCATE_STATUS_PAGE         0x37
+#define LOCATE_STATUS_PAGE_LENGTH  0
+
+#define MODE_HEADER_LENGTH         4
+
+
+/*
+ *	REQUEST SENSE packet command result - Data Format.
+ */
+typedef struct {
+	unsigned	error_code	:7;	/* Current of deferred errors */
+	unsigned	valid		:1;	/* The information field conforms to QIC-157C */
+	u8		reserved1	:8;	/* Segment Number - Reserved */
+	unsigned	sense_key	:4;	/* Sense Key */
+	unsigned	reserved2_4	:1;	/* Reserved */
+	unsigned	ili		:1;	/* Incorrect Length Indicator */
+	unsigned	eom		:1;	/* End Of Medium */
+	unsigned	filemark 	:1;	/* Filemark */
+	u32		information __attribute__ ((packed));
+	u8		asl;			/* Additional sense length (n-7) */
+	u32		command_specific;	/* Additional command specific information */
+	u8		asc;			/* Additional Sense Code */
+	u8		ascq;			/* Additional Sense Code Qualifier */
+	u8		replaceable_unit_code;	/* Field Replaceable Unit Code */
+	unsigned	sk_specific1 	:7;	/* Sense Key Specific */
+	unsigned	sksv		:1;	/* Sense Key Specific information is valid */
+	u8		sk_specific2;		/* Sense Key Specific */
+	u8		sk_specific3;		/* Sense Key Specific */
+	u8		pad[2];			/* Padding to 20 bytes */
+} idetape_request_sense_result_t;
+
+/*
+ *      Mode Parameter Header for the MODE SENSE packet command
+ */
+typedef struct {
+        u8              mode_data_length;       /* Length of the following data transfer */
+        u8              medium_type;            /* Medium Type */
+        u8              dsp;                    /* Device Specific Parameter */
+        u8              bdl;                    /* Block Descriptor Length */
+} osst_mode_parameter_header_t;
+
+/*
+ *      Mode Parameter Block Descriptor the MODE SENSE packet command
+ *
+ *      Support for block descriptors is optional.
+ */
+typedef struct {
+        u8              density_code;           /* Medium density code */
+        u8              blocks[3];              /* Number of blocks */
+        u8              reserved4;              /* Reserved */
+        u8              length[3];              /* Block Length */
+} osst_parameter_block_descriptor_t;
+
+/*
+ *      The Data Compression Page, as returned by the MODE SENSE packet command.
+ */
+typedef struct {
+#if   defined(__BIG_ENDIAN_BITFIELD)
+        unsigned        ps              :1;
+        unsigned        reserved0       :1;     /* Reserved */
+	unsigned        page_code       :6;     /* Page Code - Should be 0xf */
+#elif defined(__LITTLE_ENDIAN_BITFIELD)
+	unsigned        page_code       :6;     /* Page Code - Should be 0xf */
+        unsigned        reserved0       :1;     /* Reserved */
+        unsigned        ps              :1;
+#else
+#error "Please fix <asm/byteorder.h>"
+#endif
+        u8              page_length;            /* Page Length - Should be 14 */
+#if   defined(__BIG_ENDIAN_BITFIELD)
+        unsigned        dce             :1;     /* Data Compression Enable */
+        unsigned        dcc             :1;     /* Data Compression Capable */
+	unsigned        reserved2       :6;     /* Reserved */
+#elif defined(__LITTLE_ENDIAN_BITFIELD)
+	unsigned        reserved2       :6;     /* Reserved */
+        unsigned        dcc             :1;     /* Data Compression Capable */
+        unsigned        dce             :1;     /* Data Compression Enable */
+#else
+#error "Please fix <asm/byteorder.h>"
+#endif
+#if   defined(__BIG_ENDIAN_BITFIELD)
+        unsigned        dde             :1;     /* Data Decompression Enable */
+        unsigned        red             :2;     /* Report Exception on Decompression */
+	unsigned        reserved3       :5;     /* Reserved */
+#elif defined(__LITTLE_ENDIAN_BITFIELD)
+	unsigned        reserved3       :5;     /* Reserved */
+        unsigned        red             :2;     /* Report Exception on Decompression */
+        unsigned        dde             :1;     /* Data Decompression Enable */
+#else
+#error "Please fix <asm/byteorder.h>"
+#endif
+        u32             ca;                     /* Compression Algorithm */
+        u32             da;                     /* Decompression Algorithm */
+        u8              reserved[4];            /* Reserved */
+} osst_data_compression_page_t;
+
+/*
+ *      The Medium Partition Page, as returned by the MODE SENSE packet command.
+ */
+typedef struct {
+#if   defined(__BIG_ENDIAN_BITFIELD)
+        unsigned        ps              :1;
+        unsigned        reserved1_6     :1;     /* Reserved */
+	unsigned        page_code       :6;     /* Page Code - Should be 0x11 */
+#elif defined(__LITTLE_ENDIAN_BITFIELD)
+	unsigned        page_code       :6;     /* Page Code - Should be 0x11 */
+        unsigned        reserved1_6     :1;     /* Reserved */
+        unsigned        ps              :1;
+#else
+#error "Please fix <asm/byteorder.h>"
+#endif
+        u8              page_length;            /* Page Length - Should be 6 */
+        u8              map;                    /* Maximum Additional Partitions - Should be 0 */
+        u8              apd;                    /* Additional Partitions Defined - Should be 0 */
+#if   defined(__BIG_ENDIAN_BITFIELD)
+        unsigned        fdp             :1;     /* Fixed Data Partitions */
+        unsigned        sdp             :1;     /* Should be 0 */
+        unsigned        idp             :1;     /* Should be 0 */
+        unsigned        psum            :2;     /* Should be 0 */
+	unsigned        reserved4_012   :3;     /* Reserved */
+#elif defined(__LITTLE_ENDIAN_BITFIELD)
+	unsigned        reserved4_012   :3;     /* Reserved */
+        unsigned        psum            :2;     /* Should be 0 */
+        unsigned        idp             :1;     /* Should be 0 */
+        unsigned        sdp             :1;     /* Should be 0 */
+        unsigned        fdp             :1;     /* Fixed Data Partitions */
+#else
+#error "Please fix <asm/byteorder.h>"
+#endif
+        u8              mfr;                    /* Medium Format Recognition */
+        u8              reserved[2];            /* Reserved */
+} osst_medium_partition_page_t;
+
+/*
+ *      Capabilities and Mechanical Status Page
+ */
+typedef struct {
+#if   defined(__BIG_ENDIAN_BITFIELD)
+        unsigned        reserved1_67    :2;
+	unsigned        page_code       :6;     /* Page code - Should be 0x2a */
+#elif defined(__LITTLE_ENDIAN_BITFIELD)
+	unsigned        page_code       :6;     /* Page code - Should be 0x2a */
+        unsigned        reserved1_67    :2;
+#else
+#error "Please fix <asm/byteorder.h>"
+#endif
+        u8              page_length;            /* Page Length - Should be 0x12 */
+        u8              reserved2, reserved3;
+#if   defined(__BIG_ENDIAN_BITFIELD)
+        unsigned        reserved4_67    :2;
+        unsigned        sprev           :1;     /* Supports SPACE in the reverse direction */
+        unsigned        reserved4_1234  :4;
+	unsigned        ro              :1;     /* Read Only Mode */
+#elif defined(__LITTLE_ENDIAN_BITFIELD)
+	unsigned        ro              :1;     /* Read Only Mode */
+        unsigned        reserved4_1234  :4;
+        unsigned        sprev           :1;     /* Supports SPACE in the reverse direction */
+        unsigned        reserved4_67    :2;
+#else
+#error "Please fix <asm/byteorder.h>"
+#endif
+#if   defined(__BIG_ENDIAN_BITFIELD)
+        unsigned        reserved5_67    :2;
+        unsigned        qfa             :1;     /* Supports the QFA two partition formats */
+        unsigned        reserved5_4     :1;
+        unsigned        efmt            :1;     /* Supports ERASE command initiated formatting */
+	unsigned        reserved5_012   :3;
+#elif defined(__LITTLE_ENDIAN_BITFIELD)
+	unsigned        reserved5_012   :3;
+        unsigned        efmt            :1;     /* Supports ERASE command initiated formatting */
+        unsigned        reserved5_4     :1;
+        unsigned        qfa             :1;     /* Supports the QFA two partition formats */
+        unsigned        reserved5_67    :2;
+#else
+#error "Please fix <asm/byteorder.h>"
+#endif
+#if   defined(__BIG_ENDIAN_BITFIELD)
+        unsigned        cmprs           :1;     /* Supports data compression */
+        unsigned        ecc             :1;     /* Supports error correction */
+	unsigned        reserved6_45    :2;     /* Reserved */  
+        unsigned        eject           :1;     /* The device can eject the volume */
+        unsigned        prevent         :1;     /* The device defaults in the prevent state after power up */
+        unsigned        locked          :1;     /* The volume is locked */
+	unsigned        lock            :1;     /* Supports locking the volume */
+#elif defined(__LITTLE_ENDIAN_BITFIELD)
+	unsigned        lock            :1;     /* Supports locking the volume */
+        unsigned        locked          :1;     /* The volume is locked */
+        unsigned        prevent         :1;     /* The device defaults in the prevent state after power up */
+        unsigned        eject           :1;     /* The device can eject the volume */
+	unsigned        reserved6_45    :2;     /* Reserved */  
+        unsigned        ecc             :1;     /* Supports error correction */
+        unsigned        cmprs           :1;     /* Supports data compression */
+#else
+#error "Please fix <asm/byteorder.h>"
+#endif
+#if   defined(__BIG_ENDIAN_BITFIELD)
+        unsigned        blk32768        :1;     /* slowb - the device restricts the byte count for PIO */
+                                                /* transfers for slow buffer memory ??? */
+                                                /* Also 32768 block size in some cases */
+        unsigned        reserved7_3_6   :4;
+        unsigned        blk1024         :1;     /* Supports 1024 bytes block size */
+        unsigned        blk512          :1;     /* Supports 512 bytes block size */
+	unsigned        reserved7_0     :1;
+#elif defined(__LITTLE_ENDIAN_BITFIELD)
+	unsigned        reserved7_0     :1;
+        unsigned        blk512          :1;     /* Supports 512 bytes block size */
+        unsigned        blk1024         :1;     /* Supports 1024 bytes block size */
+        unsigned        reserved7_3_6   :4;
+        unsigned        blk32768        :1;     /* slowb - the device restricts the byte count for PIO */
+                                                /* transfers for slow buffer memory ??? */
+                                                /* Also 32768 block size in some cases */
+#else
+#error "Please fix <asm/byteorder.h>"
+#endif
+        u16             max_speed;              /* Maximum speed supported in KBps */
+        u8              reserved10, reserved11;
+        u16             ctl;                    /* Continuous Transfer Limit in blocks */
+        u16             speed;                  /* Current Speed, in KBps */
+        u16             buffer_size;            /* Buffer Size, in 512 bytes */
+        u8              reserved18, reserved19;
+} osst_capabilities_page_t;
+
+/*
+ *      Block Size Page
+ */
+typedef struct {
+#if   defined(__BIG_ENDIAN_BITFIELD)
+        unsigned        ps              :1;
+        unsigned        reserved1_6     :1;
+	unsigned        page_code       :6;     /* Page code - Should be 0x30 */
+#elif defined(__LITTLE_ENDIAN_BITFIELD)
+	unsigned        page_code       :6;     /* Page code - Should be 0x30 */
+        unsigned        reserved1_6     :1;
+        unsigned        ps              :1;
+#else
+#error "Please fix <asm/byteorder.h>"
+#endif
+        u8              page_length;            /* Page Length - Should be 2 */
+        u8              reserved2;
+#if   defined(__BIG_ENDIAN_BITFIELD)
+        unsigned        one             :1;
+        unsigned        reserved2_6     :1;
+        unsigned        record32_5      :1;
+        unsigned        record32        :1;
+        unsigned        reserved2_23    :2;
+        unsigned        play32_5        :1;
+	unsigned        play32          :1;
+#elif defined(__LITTLE_ENDIAN_BITFIELD)
+	unsigned        play32          :1;
+        unsigned        play32_5        :1;
+        unsigned        reserved2_23    :2;
+        unsigned        record32        :1;
+        unsigned        record32_5      :1;
+        unsigned        reserved2_6     :1;
+        unsigned        one             :1;
+#else
+#error "Please fix <asm/byteorder.h>"
+#endif
+} osst_block_size_page_t;
+
+/*
+ *	Tape Parameters Page
+ */
+typedef struct {
+#if   defined(__BIG_ENDIAN_BITFIELD)
+        unsigned        ps              :1;
+        unsigned        reserved1_6     :1;
+	unsigned        page_code       :6;     /* Page code - Should be 0x2b */
+#elif defined(__LITTLE_ENDIAN_BITFIELD)
+	unsigned        page_code       :6;     /* Page code - Should be 0x2b */
+        unsigned        reserved1_6     :1;
+        unsigned        ps              :1;
+#else
+#error "Please fix <asm/byteorder.h>"
+#endif
+	u8		reserved2;
+	u8		density;
+	u8		reserved3,reserved4;
+	u16		segtrk;
+	u16		trks;
+	u8		reserved5,reserved6,reserved7,reserved8,reserved9,reserved10;
+} osst_tape_paramtr_page_t;
+
+/* OnStream definitions */
+
+#define OS_CONFIG_PARTITION     (0xff)
+#define OS_DATA_PARTITION       (0)
+#define OS_PARTITION_VERSION    (1)
+
+/*
+ * partition
+ */
+typedef struct os_partition_s {
+        __u8    partition_num;
+        __u8    par_desc_ver;
+        __u16   wrt_pass_cntr;
+        __u32   first_frame_ppos;
+        __u32   last_frame_ppos;
+        __u32   eod_frame_ppos;
+} os_partition_t;
+
+/*
+ * DAT entry
+ */
+typedef struct os_dat_entry_s {
+        __u32   blk_sz;
+        __u16   blk_cnt;
+        __u8    flags;
+        __u8    reserved;
+} os_dat_entry_t;
+
+/*
+ * DAT
+ */
+#define OS_DAT_FLAGS_DATA       (0xc)
+#define OS_DAT_FLAGS_MARK       (0x1)
+
+typedef struct os_dat_s {
+        __u8            dat_sz;
+        __u8            reserved1;
+        __u8            entry_cnt;
+        __u8            reserved3;
+        os_dat_entry_t  dat_list[16];
+} os_dat_t;
+
+/*
+ * Frame types
+ */
+#define OS_FRAME_TYPE_FILL      (0)
+#define OS_FRAME_TYPE_EOD       (1 << 0)
+#define OS_FRAME_TYPE_MARKER    (1 << 1)
+#define OS_FRAME_TYPE_HEADER    (1 << 3)
+#define OS_FRAME_TYPE_DATA      (1 << 7)
+
+/*
+ * AUX
+ */
+typedef struct os_aux_s {
+        __u32           format_id;              /* hardware compability AUX is based on */
+        char            application_sig[4];     /* driver used to write this media */
+        __u32           hdwr;                   /* reserved */
+        __u32           update_frame_cntr;      /* for configuration frame */
+        __u8            frame_type;
+        __u8            frame_type_reserved;
+        __u8            reserved_18_19[2];
+        os_partition_t  partition;
+        __u8            reserved_36_43[8];
+        __u32           frame_seq_num;
+        __u32           logical_blk_num_high;
+        __u32           logical_blk_num;
+        os_dat_t        dat;
+        __u8            reserved188_191[4];
+        __u32           filemark_cnt;
+        __u32           phys_fm;
+        __u32           last_mark_ppos;
+        __u8            reserved204_223[20];
+
+        /*
+         * __u8         app_specific[32];
+         *
+         * Linux specific fields:
+         */
+         __u32          next_mark_ppos;         /* when known, points to next marker */
+	 __u32		last_mark_lbn;		/* storing log_blk_num of last mark is extends ADR spec */
+         __u8           linux_specific[24];
+
+        __u8            reserved_256_511[256];
+} os_aux_t;
+
+#define OS_FM_TAB_MAX 1024
+
+typedef struct os_fm_tab_s {
+	__u8		fm_part_num;
+	__u8		reserved_1;
+	__u8		fm_tab_ent_sz;
+	__u8		reserved_3;
+	__u16		fm_tab_ent_cnt;
+	__u8		reserved6_15[10];
+	__u32		fm_tab_ent[OS_FM_TAB_MAX];
+} os_fm_tab_t;
+
+typedef struct os_ext_trk_ey_s {
+	__u8		et_part_num;
+	__u8		fmt;
+	__u16		fm_tab_off;
+	__u8		reserved4_7[4];
+	__u32		last_hlb_hi;
+	__u32		last_hlb;
+	__u32		last_pp;
+	__u8		reserved20_31[12];
+} os_ext_trk_ey_t;
+
+typedef struct os_ext_trk_tb_s {
+	__u8		nr_stream_part;
+	__u8		reserved_1;
+	__u8		et_ent_sz;
+	__u8		reserved3_15[13];
+	os_ext_trk_ey_t	dat_ext_trk_ey;
+	os_ext_trk_ey_t	qfa_ext_trk_ey;
+} os_ext_trk_tb_t;
+
+typedef struct os_header_s {
+        char            ident_str[8];
+        __u8            major_rev;
+        __u8            minor_rev;
+	__u16		ext_trk_tb_off;
+        __u8            reserved12_15[4];
+        __u8            pt_par_num;
+        __u8            pt_reserved1_3[3];
+        os_partition_t  partition[16];
+	__u32		cfg_col_width;
+	__u32		dat_col_width;
+	__u32		qfa_col_width;
+	__u8		cartridge[16];
+	__u8		reserved304_511[208];
+	__u32		old_filemark_list[16680/4];		/* in ADR 1.4 __u8 track_table[16680] */
+	os_ext_trk_tb_t	ext_track_tb;
+	__u8		reserved17272_17735[464];
+	os_fm_tab_t	dat_fm_tab;
+	os_fm_tab_t	qfa_fm_tab;
+	__u8		reserved25960_32767[6808];
+} os_header_t;
+
+
+/*
+ * OnStream ADRL frame
+ */
+#define OS_FRAME_SIZE   (32 * 1024 + 512)
+#define OS_DATA_SIZE    (32 * 1024)
+#define OS_AUX_SIZE     (512)
+//#define OSST_MAX_SG      2
+
+/* The OnStream tape buffer descriptor. */
+struct osst_buffer {
+  unsigned char in_use;
+  unsigned char dma;	/* DMA-able buffer */
+  int buffer_size;
+  int buffer_blocks;
+  int buffer_bytes;
+  int read_pointer;
+  int writing;
+  int midlevel_result;
+  int syscall_result;
+  struct scsi_request *last_SRpnt;
+  unsigned char *b_data;
+  os_aux_t *aux;               /* onstream AUX structure at end of each block     */
+  unsigned short use_sg;       /* zero or number of s/g segments for this adapter */
+  unsigned short sg_segs;      /* number of segments in s/g list                  */
+  unsigned short orig_sg_segs; /* number of segments allocated at first try       */
+  struct scatterlist sg[1];    /* MUST BE last item                               */
+} ;
+
+/* The OnStream tape drive descriptor */
+struct osst_tape {
+  struct scsi_driver *driver;
+  unsigned capacity;
+  struct scsi_device *device;
+  struct semaphore lock;       /* for serialization */
+  struct completion wait;      /* for SCSI commands */
+  struct osst_buffer * buffer;
+
+  /* Drive characteristics */
+  unsigned char omit_blklims;
+  unsigned char do_auto_lock;
+  unsigned char can_bsr;
+  unsigned char can_partitions;
+  unsigned char two_fm;
+  unsigned char fast_mteom;
+  unsigned char restr_dma;
+  unsigned char scsi2_logical;
+  unsigned char default_drvbuffer;  /* 0xff = don't touch, value 3 bits */
+  unsigned char pos_unknown;        /* after reset position unknown */
+  int write_threshold;
+  int timeout;			/* timeout for normal commands */
+  int long_timeout;		/* timeout for commands known to take long time*/
+
+  /* Mode characteristics */
+  struct st_modedef modes[ST_NBR_MODES];
+  int current_mode;
+
+  /* Status variables */
+  int partition;
+  int new_partition;
+  int nbr_partitions;    /* zero until partition support enabled */
+  struct st_partstat ps[ST_NBR_PARTITIONS];
+  unsigned char dirty;
+  unsigned char ready;
+  unsigned char write_prot;
+  unsigned char drv_write_prot;
+  unsigned char in_use;
+  unsigned char blksize_changed;
+  unsigned char density_changed;
+  unsigned char compression_changed;
+  unsigned char drv_buffer;
+  unsigned char density;
+  unsigned char door_locked;
+  unsigned char rew_at_close;
+  unsigned char inited;
+  int block_size;
+  int min_block;
+  int max_block;
+  int recover_count;            /* from tape opening */
+  int abort_count;
+  int write_count;
+  int read_count;
+  int recover_erreg;            /* from last status call */
+  /*
+   * OnStream specific data
+   */
+  int	   os_fw_rev;			       /* the firmware revision * 10000 */
+  unsigned char  raw;                          /* flag OnStream raw access (32.5KB block size) */
+  unsigned char  poll;                         /* flag that this drive needs polling (IDE|firmware) */
+  unsigned char  frame_in_buffer;	       /* flag that the frame as per frame_seq_number
+						* has been read into STp->buffer and is valid */
+  int      frame_seq_number;                   /* logical frame number */
+  int      logical_blk_num;                    /* logical block number */
+  unsigned first_frame_position;               /* physical frame to be transferred to/from host */
+  unsigned last_frame_position;                /* physical frame to be transferd to/from tape */
+  int      cur_frames;                         /* current number of frames in internal buffer */
+  int      max_frames;                         /* max number of frames in internal buffer */
+  char     application_sig[5];                 /* application signature */
+  unsigned char  fast_open;                    /* flag that reminds us we didn't check headers at open */
+  unsigned short wrt_pass_cntr;                /* write pass counter */
+  int      update_frame_cntr;                  /* update frame counter */
+  int      onstream_write_error;               /* write error recovery active */
+  int      header_ok;                          /* header frame verified ok */
+  int      linux_media;                        /* reading linux-specifc media */
+  int      linux_media_version;
+  os_header_t * header_cache;		       /* cache is kept for filemark positions */
+  int      filemark_cnt;
+  int      first_mark_ppos;
+  int      last_mark_ppos;
+  int      last_mark_lbn;			/* storing log_blk_num of last mark is extends ADR spec */
+  int      first_data_ppos;
+  int      eod_frame_ppos;
+  int      eod_frame_lfa;
+  int      write_type;				/* used in write error recovery */
+  int      read_error_frame;			/* used in read error recovery */
+  unsigned long cmd_start_time;
+  unsigned long max_cmd_time;
+
+#if DEBUG
+  unsigned char write_pending;
+  int nbr_finished;
+  int nbr_waits;
+  unsigned char last_cmnd[6];
+  unsigned char last_sense[16];
+#endif
+  struct gendisk *drive;
+} ;
+
+/* Values of write_type */
+#define OS_WRITE_DATA      0
+#define OS_WRITE_EOD       1
+#define OS_WRITE_NEW_MARK  2
+#define OS_WRITE_LAST_MARK 3
+#define OS_WRITE_HEADER    4
+#define OS_WRITE_FILLER    5
+
+/* Additional rw state */
+#define OS_WRITING_COMPLETE 3