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-rw-r--r--drivers/scsi/osst.h638
1 files changed, 638 insertions, 0 deletions
diff --git a/drivers/scsi/osst.h b/drivers/scsi/osst.h
new file mode 100644
index 000000000000..b72e1c76f52c
--- /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