Merge branch 'master' of /home/aia21/ntfs-2.6/

1 files changed, 282 insertions, 246 deletions

diff --git a/drivers/scsi/osst.c b/drivers/scsi/osst.c
index d9946bd95492..66ea47a9c53c 100644
--- a/drivers/scsi/osst.c
+++ b/drivers/scsi/osst.c
@@ -13,7 +13,7 @@
   order) Klaus Ehrenfried, Wolfgang Denk, Steve Hirsch, Andreas Koppenh"ofer,
   Michael Leodolter, Eyal Lebedinsky, J"org Weule, and Eric Youngdale.
 
-  Copyright 1992 - 2002 Kai Makisara / 2000 - 2004 Willem Riede
+  Copyright 1992 - 2002 Kai Makisara / 2000 - 2006 Willem Riede
 	 email osst@riede.org
 
   $Header: /cvsroot/osst/Driver/osst.c,v 1.73 2005/01/01 21:13:34 wriede Exp $
@@ -24,7 +24,7 @@
 */
 
 static const char * cvsid = "$Id: osst.c,v 1.73 2005/01/01 21:13:34 wriede Exp $";
-static const char * osst_version = "0.99.3";
+static const char * osst_version = "0.99.4";
 
 /* The "failure to reconnect" firmware bug */
 #define OSST_FW_NEED_POLL_MIN 10601 /*(107A)*/
@@ -48,7 +48,6 @@ static const char * osst_version = "0.99.3";
 #include <linux/vmalloc.h>
 #include <linux/blkdev.h>
 #include <linux/moduleparam.h>
-#include <linux/devfs_fs_kernel.h>
 #include <linux/delay.h>
 #include <asm/uaccess.h>
 #include <asm/dma.h>
@@ -70,7 +69,6 @@ static const char * osst_version = "0.99.3";
 #include <scsi/scsi_eh.h>
 #include <scsi/scsi_host.h>
 #include <scsi/scsi_ioctl.h>
-#include <scsi/scsi_request.h>
 
 #define ST_KILOBYTE 1024
 
@@ -87,6 +85,7 @@ static int max_sg_segs = 0;
 MODULE_AUTHOR("Willem Riede");
 MODULE_DESCRIPTION("OnStream {DI-|FW-|SC-|USB}{30|50} Tape Driver");
 MODULE_LICENSE("GPL");
+MODULE_ALIAS_CHARDEV_MAJOR(OSST_MAJOR);
 
 module_param(max_dev, int, 0444);
 MODULE_PARM_DESC(max_dev, "Maximum number of OnStream Tape Drives to attach (4)");
@@ -107,8 +106,6 @@ static struct osst_dev_parm {
 };
 #endif
 
-static char *osst_formats[ST_NBR_MODES] ={"", "l", "m", "a"};
-
 /* Some default definitions have been moved to osst_options.h */
 #define OSST_BUFFER_SIZE (OSST_BUFFER_BLOCKS * ST_KILOBYTE)
 #define OSST_WRITE_THRESHOLD (OSST_WRITE_THRESHOLD_BLOCKS * ST_KILOBYTE)
@@ -179,16 +176,16 @@ static struct scsi_driver osst_template = {
 	}
 };
 
-static int osst_int_ioctl(struct osst_tape *STp, struct scsi_request ** aSRpnt,
+static int osst_int_ioctl(struct osst_tape *STp, struct osst_request ** aSRpnt,
 			    unsigned int cmd_in, unsigned long arg);
 
-static int osst_set_frame_position(struct osst_tape *STp, struct scsi_request ** aSRpnt, int frame, int skip);
+static int osst_set_frame_position(struct osst_tape *STp, struct osst_request ** aSRpnt, int frame, int skip);
 
-static int osst_get_frame_position(struct osst_tape *STp, struct scsi_request ** aSRpnt);
+static int osst_get_frame_position(struct osst_tape *STp, struct osst_request ** aSRpnt);
 
-static int osst_flush_write_buffer(struct osst_tape *STp, struct scsi_request ** aSRpnt);
+static int osst_flush_write_buffer(struct osst_tape *STp, struct osst_request ** aSRpnt);
 
-static int osst_write_error_recovery(struct osst_tape * STp, struct scsi_request ** aSRpnt, int pending);
+static int osst_write_error_recovery(struct osst_tape * STp, struct osst_request ** aSRpnt, int pending);
 
 static inline char *tape_name(struct osst_tape *tape)
 {
@@ -197,52 +194,84 @@ static inline char *tape_name(struct osst_tape *tape)
 
 /* Routines that handle the interaction with mid-layer SCSI routines */
 
+
+/* Normalize Sense */
+static void osst_analyze_sense(struct osst_request *SRpnt, struct st_cmdstatus *s)
+{
+	const u8 *ucp;
+	const u8 *sense = SRpnt->sense;
+
+	s->have_sense = scsi_normalize_sense(SRpnt->sense,
+				SCSI_SENSE_BUFFERSIZE, &s->sense_hdr);
+	s->flags = 0;
+
+	if (s->have_sense) {
+		s->deferred = 0;
+		s->remainder_valid =
+			scsi_get_sense_info_fld(sense, SCSI_SENSE_BUFFERSIZE, &s->uremainder64);
+		switch (sense[0] & 0x7f) {
+		case 0x71:
+			s->deferred = 1;
+		case 0x70:
+			s->fixed_format = 1;
+			s->flags = sense[2] & 0xe0;
+			break;
+		case 0x73:
+			s->deferred = 1;
+		case 0x72:
+			s->fixed_format = 0;
+			ucp = scsi_sense_desc_find(sense, SCSI_SENSE_BUFFERSIZE, 4);
+			s->flags = ucp ? (ucp[3] & 0xe0) : 0;
+			break;
+		}
+	}
+}
+
 /* Convert the result to success code */
-static int osst_chk_result(struct osst_tape * STp, struct scsi_request * SRpnt)
+static int osst_chk_result(struct osst_tape * STp, struct osst_request * SRpnt)
 {
 	char *name = tape_name(STp);
-	int result = SRpnt->sr_result;
-	unsigned char * sense = SRpnt->sr_sense_buffer, scode;
+	int result = SRpnt->result;
+	u8 * sense = SRpnt->sense, scode;
 #if DEBUG
 	const char *stp;
 #endif
+	struct st_cmdstatus *cmdstatp;
 
-	if (!result) {
-		sense[0] = 0;    /* We don't have sense data if this byte is zero */
+	if (!result)
 		return 0;
-	}
-	if ((driver_byte(result) & DRIVER_MASK) == DRIVER_SENSE)
-		scode = sense[2] & 0x0f;
-	else {
-		sense[0] = 0;    /* We don't have sense data if this byte is zero */
+
+	cmdstatp = &STp->buffer->cmdstat;
+	osst_analyze_sense(SRpnt, cmdstatp);
+
+	if (cmdstatp->have_sense)
+		scode = STp->buffer->cmdstat.sense_hdr.sense_key;
+	else
 		scode = 0;
-	}
 #if DEBUG
 	if (debugging) {
-		printk(OSST_DEB_MSG "%s:D: Error: %x, cmd: %x %x %x %x %x %x Len: %d\n",
+		printk(OSST_DEB_MSG "%s:D: Error: %x, cmd: %x %x %x %x %x %x\n",
 		   name, result,
-		   SRpnt->sr_cmnd[0], SRpnt->sr_cmnd[1], SRpnt->sr_cmnd[2],
-		   SRpnt->sr_cmnd[3], SRpnt->sr_cmnd[4], SRpnt->sr_cmnd[5],
-		   SRpnt->sr_bufflen);
+		   SRpnt->cmd[0], SRpnt->cmd[1], SRpnt->cmd[2],
+		   SRpnt->cmd[3], SRpnt->cmd[4], SRpnt->cmd[5]);
 		if (scode) printk(OSST_DEB_MSG "%s:D: Sense: %02x, ASC: %02x, ASCQ: %02x\n",
 			       	name, scode, sense[12], sense[13]);
-		if (driver_byte(result) & DRIVER_SENSE)
-			scsi_print_req_sense("osst ", SRpnt);
+		if (cmdstatp->have_sense)
+			__scsi_print_sense("osst ", SRpnt->sense, SCSI_SENSE_BUFFERSIZE);
 	}
 	else
 #endif
-	if (!(driver_byte(result) & DRIVER_SENSE) ||
-		((sense[0] & 0x70) == 0x70 &&
+	if (cmdstatp->have_sense && (
 		 scode != NO_SENSE &&
 		 scode != RECOVERED_ERROR &&
 /*      	 scode != UNIT_ATTENTION && */
 		 scode != BLANK_CHECK &&
 		 scode != VOLUME_OVERFLOW &&
-		 SRpnt->sr_cmnd[0] != MODE_SENSE &&
-		 SRpnt->sr_cmnd[0] != TEST_UNIT_READY)) { /* Abnormal conditions for tape */
-		if (driver_byte(result) & DRIVER_SENSE) {
+		 SRpnt->cmd[0] != MODE_SENSE &&
+		 SRpnt->cmd[0] != TEST_UNIT_READY)) { /* Abnormal conditions for tape */
+		if (cmdstatp->have_sense) {
 			printk(KERN_WARNING "%s:W: Command with sense data:\n", name);
-			scsi_print_req_sense("osst:", SRpnt);
+			__scsi_print_sense("osst ", SRpnt->sense, SCSI_SENSE_BUFFERSIZE);
 		}
 		else {
 			static	int	notyetprinted = 1;
@@ -262,15 +291,14 @@ static int osst_chk_result(struct osst_tape * STp, struct scsi_request * SRpnt)
 	}
 	STp->pos_unknown |= STp->device->was_reset;
 
-	if ((sense[0] & 0x70) == 0x70 &&
-	     scode == RECOVERED_ERROR) {
+	if (cmdstatp->have_sense && scode == RECOVERED_ERROR) {
 		STp->recover_count++;
 		STp->recover_erreg++;
 #if DEBUG
 		if (debugging) {
-			if (SRpnt->sr_cmnd[0] == READ_6)
+			if (SRpnt->cmd[0] == READ_6)
 				stp = "read";
-			else if (SRpnt->sr_cmnd[0] == WRITE_6)
+			else if (SRpnt->cmd[0] == WRITE_6)
 				stp = "write";
 			else
 				stp = "ioctl";
@@ -286,74 +314,99 @@ static int osst_chk_result(struct osst_tape * STp, struct scsi_request * SRpnt)
 
 
 /* Wakeup from interrupt */
-static void osst_sleep_done (struct scsi_cmnd * SCpnt)
+static void osst_sleep_done(void *data, char *sense, int result, int resid)
 {
-	struct osst_tape * STp = container_of(SCpnt->request->rq_disk->private_data, struct osst_tape, driver);
-
-	if ((STp->buffer)->writing &&
-	    (SCpnt->sense_buffer[0] & 0x70) == 0x70 &&
-	    (SCpnt->sense_buffer[2] & 0x40)) {
-		/* EOM at write-behind, has all been written? */
-		if ((SCpnt->sense_buffer[2] & 0x0f) == VOLUME_OVERFLOW)
-			STp->buffer->midlevel_result = SCpnt->result; /* Error */
-		else
-			STp->buffer->midlevel_result = INT_MAX;       /* OK */
-	}
-	else
-		STp->buffer->midlevel_result = SCpnt->result;
-	SCpnt->request->rq_status = RQ_SCSI_DONE;
-	STp->buffer->last_SRpnt = SCpnt->sc_request;
+	struct osst_request *SRpnt = data;
+	struct osst_tape *STp = SRpnt->stp;
 
+	memcpy(SRpnt->sense, sense, SCSI_SENSE_BUFFERSIZE);
+	STp->buffer->cmdstat.midlevel_result = SRpnt->result = result;
 #if DEBUG
 	STp->write_pending = 0;
 #endif
-	complete(SCpnt->request->waiting);
+	if (SRpnt->waiting)
+		complete(SRpnt->waiting);
 }
 
+/* osst_request memory management */
+static struct osst_request *osst_allocate_request(void)
+{
+	return kzalloc(sizeof(struct osst_request), GFP_KERNEL);
+}
+
+static void osst_release_request(struct osst_request *streq)
+{
+	kfree(streq);
+}
 
 /* Do the scsi command. Waits until command performed if do_wait is true.
    Otherwise osst_write_behind_check() is used to check that the command
    has finished. */
-static	struct scsi_request * osst_do_scsi(struct scsi_request *SRpnt, struct osst_tape *STp, 
+static	struct osst_request * osst_do_scsi(struct osst_request *SRpnt, struct osst_tape *STp, 
 	unsigned char *cmd, int bytes, int direction, int timeout, int retries, int do_wait)
 {
 	unsigned char *bp;
+	unsigned short use_sg;
 #ifdef OSST_INJECT_ERRORS
 	static   int   inject = 0;
 	static   int   repeat = 0;
 #endif
+	struct completion *waiting;
+
+	/* if async, make sure there's no command outstanding */
+	if (!do_wait && ((STp->buffer)->last_SRpnt)) {
+		printk(KERN_ERR "%s: Async command already active.\n",
+		       tape_name(STp));
+		if (signal_pending(current))
+			(STp->buffer)->syscall_result = (-EINTR);
+		else
+			(STp->buffer)->syscall_result = (-EBUSY);
+		return NULL;
+	}
+
 	if (SRpnt == NULL) {
-		if ((SRpnt = scsi_allocate_request(STp->device, GFP_ATOMIC)) == NULL) {
-			printk(KERN_ERR "%s:E: Can't get SCSI request.\n", tape_name(STp));
+		SRpnt = osst_allocate_request();
+		if (SRpnt == NULL) {
+			printk(KERN_ERR "%s: Can't allocate SCSI request.\n",
+				     tape_name(STp));
 			if (signal_pending(current))
 				(STp->buffer)->syscall_result = (-EINTR);
 			else
 				(STp->buffer)->syscall_result = (-EBUSY);
 			return NULL;
 		}
+		SRpnt->stp = STp;
 	}
 
-        init_completion(&STp->wait);
-	SRpnt->sr_use_sg = (bytes > (STp->buffer)->sg[0].length) ?
-				    (STp->buffer)->use_sg : 0;
-	if (SRpnt->sr_use_sg) {
+	/* If async IO, set last_SRpnt. This ptr tells write_behind_check
+	   which IO is outstanding. It's nulled out when the IO completes. */
+	if (!do_wait)
+		(STp->buffer)->last_SRpnt = SRpnt;
+
+	waiting = &STp->wait;
+	init_completion(waiting);
+	SRpnt->waiting = waiting;
+
+	use_sg = (bytes > STp->buffer->sg[0].length) ? STp->buffer->use_sg : 0;
+	if (use_sg) {
 		bp = (char *)&(STp->buffer->sg[0]);
-		if (STp->buffer->sg_segs < SRpnt->sr_use_sg)
-			SRpnt->sr_use_sg = STp->buffer->sg_segs;
+		if (STp->buffer->sg_segs < use_sg)
+			use_sg = STp->buffer->sg_segs;
 	}
 	else
 		bp = (STp->buffer)->b_data;
-	SRpnt->sr_data_direction = direction;
-	SRpnt->sr_cmd_len = 0;
-	SRpnt->sr_request->waiting = &(STp->wait);
-	SRpnt->sr_request->rq_status = RQ_SCSI_BUSY;
-	SRpnt->sr_request->rq_disk = STp->drive;
 
-	scsi_do_req(SRpnt, (void *)cmd, bp, bytes, osst_sleep_done, timeout, retries);
+	memcpy(SRpnt->cmd, cmd, sizeof(SRpnt->cmd));
+	STp->buffer->cmdstat.have_sense = 0;
+	STp->buffer->syscall_result = 0;
 
-	if (do_wait) {
-		wait_for_completion(SRpnt->sr_request->waiting);
-		SRpnt->sr_request->waiting = NULL;
+	if (scsi_execute_async(STp->device, cmd, COMMAND_SIZE(cmd[0]), direction, bp, bytes,
+			use_sg, timeout, retries, SRpnt, osst_sleep_done, GFP_KERNEL))
+		/* could not allocate the buffer or request was too large */
+		(STp->buffer)->syscall_result = (-EBUSY);
+	else if (do_wait) {
+		wait_for_completion(waiting);
+		SRpnt->waiting = NULL;
 		STp->buffer->syscall_result = osst_chk_result(STp, SRpnt);
 #ifdef OSST_INJECT_ERRORS
 		if (STp->buffer->syscall_result == 0 &&
@@ -386,21 +439,22 @@ static void osst_write_behind_check(struct osst_tape *STp)
 		STp->nbr_finished++;
 #endif
 	wait_for_completion(&(STp->wait));
-	(STp->buffer)->last_SRpnt->sr_request->waiting = NULL;
+	STp->buffer->last_SRpnt->waiting = NULL;
 
 	STp->buffer->syscall_result = osst_chk_result(STp, STp->buffer->last_SRpnt);
 
-	if ((STp->buffer)->syscall_result)
-		(STp->buffer)->syscall_result =
-			osst_write_error_recovery(STp, &((STp->buffer)->last_SRpnt), 1);
+	if (STp->buffer->syscall_result)
+		STp->buffer->syscall_result =
+			osst_write_error_recovery(STp, &(STp->buffer->last_SRpnt), 1);
 	else
 		STp->first_frame_position++;
 
-	scsi_release_request((STp->buffer)->last_SRpnt);
+	osst_release_request(STp->buffer->last_SRpnt);
 
 	if (STbuffer->writing < STbuffer->buffer_bytes)
 		printk(KERN_WARNING "osst :A: write_behind_check: something left in buffer!\n");
 
+	STbuffer->last_SRpnt = NULL;
 	STbuffer->buffer_bytes -= STbuffer->writing;
 	STbuffer->writing = 0;
 
@@ -609,11 +663,11 @@ err_out:
 /*
  * Wait for the unit to become Ready
  */
-static int osst_wait_ready(struct osst_tape * STp, struct scsi_request ** aSRpnt,
+static int osst_wait_ready(struct osst_tape * STp, struct osst_request ** aSRpnt,
 				 unsigned timeout, int initial_delay)
 {
 	unsigned char		cmd[MAX_COMMAND_SIZE];
-	struct scsi_request   * SRpnt;
+	struct osst_request   * SRpnt;
 	unsigned long		startwait = jiffies;
 #if DEBUG
 	int			dbg  = debugging;
@@ -633,10 +687,10 @@ static int osst_wait_ready(struct osst_tape * STp, struct scsi_request ** aSRpnt
 	if (!SRpnt) return (-EBUSY);
 
 	while ( STp->buffer->syscall_result && time_before(jiffies, startwait + timeout*HZ) &&
-	       (( SRpnt->sr_sense_buffer[2]  == 2 && SRpnt->sr_sense_buffer[12] == 4    &&
-		 (SRpnt->sr_sense_buffer[13] == 1 || SRpnt->sr_sense_buffer[13] == 8)    ) ||
-		( SRpnt->sr_sense_buffer[2]  == 6 && SRpnt->sr_sense_buffer[12] == 0x28 &&
-		  SRpnt->sr_sense_buffer[13] == 0                                        )  )) {
+	       (( SRpnt->sense[2]  == 2 && SRpnt->sense[12] == 4    &&
+		 (SRpnt->sense[13] == 1 || SRpnt->sense[13] == 8)    ) ||
+		( SRpnt->sense[2]  == 6 && SRpnt->sense[12] == 0x28 &&
+		  SRpnt->sense[13] == 0                                        )  )) {
 #if DEBUG
 	    if (debugging) {
 		printk(OSST_DEB_MSG "%s:D: Sleeping in onstream wait ready\n", name);
@@ -660,8 +714,8 @@ static int osst_wait_ready(struct osst_tape * STp, struct scsi_request ** aSRpnt
 #if DEBUG
 	    printk(OSST_DEB_MSG "%s:D: Abnormal exit from onstream wait ready\n", name);
 	    printk(OSST_DEB_MSG "%s:D: Result = %d, Sense: 0=%02x, 2=%02x, 12=%02x, 13=%02x\n", name,
-			STp->buffer->syscall_result, SRpnt->sr_sense_buffer[0], SRpnt->sr_sense_buffer[2],
-			SRpnt->sr_sense_buffer[12], SRpnt->sr_sense_buffer[13]);
+			STp->buffer->syscall_result, SRpnt->sense[0], SRpnt->sense[2],
+			SRpnt->sense[12], SRpnt->sense[13]);
 #endif
 	    return (-EIO);
 	}
@@ -674,10 +728,10 @@ static int osst_wait_ready(struct osst_tape * STp, struct scsi_request ** aSRpnt
 /*
  * Wait for a tape to be inserted in the unit
  */
-static int osst_wait_for_medium(struct osst_tape * STp, struct scsi_request ** aSRpnt, unsigned timeout)
+static int osst_wait_for_medium(struct osst_tape * STp, struct osst_request ** aSRpnt, unsigned timeout)
 {
 	unsigned char		cmd[MAX_COMMAND_SIZE];
-	struct scsi_request   * SRpnt;
+	struct osst_request   * SRpnt;
 	unsigned long		startwait = jiffies;
 #if DEBUG
 	int			dbg = debugging;
@@ -694,8 +748,7 @@ static int osst_wait_for_medium(struct osst_tape * STp, struct scsi_request ** a
 	if (!SRpnt) return (-EBUSY);
 
 	while ( STp->buffer->syscall_result && time_before(jiffies, startwait + timeout*HZ) &&
-		SRpnt->sr_sense_buffer[2]  == 2 && SRpnt->sr_sense_buffer[12] == 0x3a       &&
-	        SRpnt->sr_sense_buffer[13] == 0                                             ) {
+		SRpnt->sense[2] == 2 && SRpnt->sense[12] == 0x3a && SRpnt->sense[13] == 0  ) {
 #if DEBUG
 	    if (debugging) {
 		printk(OSST_DEB_MSG "%s:D: Sleeping in onstream wait medium\n", name);
@@ -714,13 +767,13 @@ static int osst_wait_for_medium(struct osst_tape * STp, struct scsi_request ** a
 #if DEBUG
 	debugging = dbg;
 #endif
-	if ( STp->buffer->syscall_result     && SRpnt->sr_sense_buffer[2]  != 2 &&
-	     SRpnt->sr_sense_buffer[12] != 4 && SRpnt->sr_sense_buffer[13] == 1) {
+	if ( STp->buffer->syscall_result     && SRpnt->sense[2]  != 2 &&
+	     SRpnt->sense[12] != 4 && SRpnt->sense[13] == 1) {
 #if DEBUG
 	    printk(OSST_DEB_MSG "%s:D: Abnormal exit from onstream wait medium\n", name);
 	    printk(OSST_DEB_MSG "%s:D: Result = %d, Sense: 0=%02x, 2=%02x, 12=%02x, 13=%02x\n", name,
-			STp->buffer->syscall_result, SRpnt->sr_sense_buffer[0], SRpnt->sr_sense_buffer[2],
-			SRpnt->sr_sense_buffer[12], SRpnt->sr_sense_buffer[13]);
+			STp->buffer->syscall_result, SRpnt->sense[0], SRpnt->sense[2],
+			SRpnt->sense[12], SRpnt->sense[13]);
 #endif
 	    return 0;
 	}
@@ -730,7 +783,7 @@ static int osst_wait_for_medium(struct osst_tape * STp, struct scsi_request ** a
 	return 1;
 }
 
-static int osst_position_tape_and_confirm(struct osst_tape * STp, struct scsi_request ** aSRpnt, int frame)
+static int osst_position_tape_and_confirm(struct osst_tape * STp, struct osst_request ** aSRpnt, int frame)
 {
 	int	retval;
 
@@ -744,10 +797,10 @@ static int osst_position_tape_and_confirm(struct osst_tape * STp, struct scsi_re
 /*
  * Wait for write(s) to complete
  */
-static int osst_flush_drive_buffer(struct osst_tape * STp, struct scsi_request ** aSRpnt)
+static int osst_flush_drive_buffer(struct osst_tape * STp, struct osst_request ** aSRpnt)
 {
 	unsigned char		cmd[MAX_COMMAND_SIZE];
-	struct scsi_request   * SRpnt;
+	struct osst_request   * SRpnt;
 	int			result = 0;
 	int			delay  = OSST_WAIT_WRITE_COMPLETE;
 #if DEBUG
@@ -764,8 +817,8 @@ static int osst_flush_drive_buffer(struct osst_tape * STp, struct scsi_request *
 	*aSRpnt = SRpnt;
 	if (!SRpnt) return (-EBUSY);
 	if (STp->buffer->syscall_result) {
-		if ((SRpnt->sr_sense_buffer[2] & 0x0f) == 2 && SRpnt->sr_sense_buffer[12] == 4) {
-			if (SRpnt->sr_sense_buffer[13] == 8) {
+		if ((SRpnt->sense[2] & 0x0f) == 2 && SRpnt->sense[12] == 4) {
+			if (SRpnt->sense[13] == 8) {
 				delay = OSST_WAIT_LONG_WRITE_COMPLETE;
 			}
 		} else
@@ -778,7 +831,7 @@ static int osst_flush_drive_buffer(struct osst_tape * STp, struct scsi_request *
 }
 
 #define OSST_POLL_PER_SEC 10
-static int osst_wait_frame(struct osst_tape * STp, struct scsi_request ** aSRpnt, int curr, int minlast, int to)
+static int osst_wait_frame(struct osst_tape * STp, struct osst_request ** aSRpnt, int curr, int minlast, int to)
 {
 	unsigned long	startwait = jiffies;
 	char	      * name      = tape_name(STp);
@@ -833,9 +886,9 @@ static int osst_wait_frame(struct osst_tape * STp, struct scsi_request ** aSRpnt
 	return -EBUSY;
 }
 
-static int osst_recover_wait_frame(struct osst_tape * STp, struct scsi_request ** aSRpnt, int writing)
+static int osst_recover_wait_frame(struct osst_tape * STp, struct osst_request ** aSRpnt, int writing)
 {
-	struct scsi_request   * SRpnt;
+	struct osst_request   * SRpnt;
 	unsigned char		cmd[MAX_COMMAND_SIZE];
 	unsigned long   	startwait = jiffies;
 	int			retval    = 1;
@@ -856,7 +909,7 @@ static int osst_recover_wait_frame(struct osst_tape * STp, struct scsi_request *
 
 		while (retval && time_before (jiffies, startwait + 5*60*HZ)) {
 
-			if (STp->buffer->syscall_result && (SRpnt->sr_sense_buffer[2] & 0x0f) != 2) {
+			if (STp->buffer->syscall_result && (SRpnt->sense[2] & 0x0f) != 2) {
 
 				/* some failure - not just not-ready */
 				retval = osst_write_error_recovery(STp, aSRpnt, 0);
@@ -881,9 +934,9 @@ static int osst_recover_wait_frame(struct osst_tape * STp, struct scsi_request *
 		if (STp->buffer->syscall_result)
 			printk(KERN_WARNING
 				"%s:W: Recover_wait_frame(read) cannot handle %02x:%02x:%02x\n", name,
-					(*aSRpnt)->sr_sense_buffer[ 2] & 0x0f,
-					(*aSRpnt)->sr_sense_buffer[12],
-					(*aSRpnt)->sr_sense_buffer[13]);
+					(*aSRpnt)->sense[ 2] & 0x0f,
+					(*aSRpnt)->sense[12],
+					(*aSRpnt)->sense[13]);
 
 	return retval;
 }
@@ -891,10 +944,10 @@ static int osst_recover_wait_frame(struct osst_tape * STp, struct scsi_request *
 /*
  * Read the next OnStream tape frame at the current location
  */
-static int osst_read_frame(struct osst_tape * STp, struct scsi_request ** aSRpnt, int timeout)
+static int osst_read_frame(struct osst_tape * STp, struct osst_request ** aSRpnt, int timeout)
 {
 	unsigned char		cmd[MAX_COMMAND_SIZE];
-	struct scsi_request   * SRpnt;
+	struct osst_request   * SRpnt;
 	int			retval = 0;
 #if DEBUG
 	os_aux_t	      * aux    = STp->buffer->aux;
@@ -932,10 +985,10 @@ static int osst_read_frame(struct osst_tape * STp, struct scsi_request ** aSRpnt
 	    if (debugging)
 		printk(OSST_DEB_MSG "%s:D: Sense: %2x %2x %2x %2x %2x %2x %2x %2x\n",
 		   name,
-		   SRpnt->sr_sense_buffer[0], SRpnt->sr_sense_buffer[1],
-		   SRpnt->sr_sense_buffer[2], SRpnt->sr_sense_buffer[3],
-		   SRpnt->sr_sense_buffer[4], SRpnt->sr_sense_buffer[5],
-		   SRpnt->sr_sense_buffer[6], SRpnt->sr_sense_buffer[7]);
+		   SRpnt->sense[0], SRpnt->sense[1],
+		   SRpnt->sense[2], SRpnt->sense[3],
+		   SRpnt->sense[4], SRpnt->sense[5],
+		   SRpnt->sense[6], SRpnt->sense[7]);
 #endif
 	}
 	else
@@ -962,10 +1015,10 @@ static int osst_read_frame(struct osst_tape * STp, struct scsi_request ** aSRpnt
 	return (retval);
 }
 
-static int osst_initiate_read(struct osst_tape * STp, struct scsi_request ** aSRpnt)
+static int osst_initiate_read(struct osst_tape * STp, struct osst_request ** aSRpnt)
 {
 	struct st_partstat    * STps   = &(STp->ps[STp->partition]);
-	struct scsi_request   * SRpnt  ;
+	struct osst_request   * SRpnt  ;
 	unsigned char		cmd[MAX_COMMAND_SIZE];
 	int			retval = 0;
 	char		      * name   = tape_name(STp);
@@ -999,7 +1052,7 @@ static int osst_initiate_read(struct osst_tape * STp, struct scsi_request ** aSR
 	return retval;
 }
 
-static int osst_get_logical_frame(struct osst_tape * STp, struct scsi_request ** aSRpnt,
+static int osst_get_logical_frame(struct osst_tape * STp, struct osst_request ** aSRpnt,
 						int frame_seq_number, int quiet)
 {
 	struct st_partstat * STps  = &(STp->ps[STp->partition]);
@@ -1128,7 +1181,7 @@ static int osst_get_logical_frame(struct osst_tape * STp, struct scsi_request **
 	return (STps->eof);
 }
 
-static int osst_seek_logical_blk(struct osst_tape * STp, struct scsi_request ** aSRpnt, int logical_blk_num)
+static int osst_seek_logical_blk(struct osst_tape * STp, struct osst_request ** aSRpnt, int logical_blk_num)
 {
         struct st_partstat * STps = &(STp->ps[STp->partition]);
 	char		   * name = tape_name(STp);
@@ -1237,7 +1290,7 @@ error:
 #define OSST_SECTOR_SHIFT 9
 #define OSST_SECTOR_MASK  0x03F
 
-static int osst_get_sector(struct osst_tape * STp, struct scsi_request ** aSRpnt)
+static int osst_get_sector(struct osst_tape * STp, struct osst_request ** aSRpnt)
 {
 	int	sector;
 #if DEBUG
@@ -1267,7 +1320,7 @@ static int osst_get_sector(struct osst_tape * STp, struct scsi_request ** aSRpnt
 	return sector;
 }
 
-static int osst_seek_sector(struct osst_tape * STp, struct scsi_request ** aSRpnt, int sector)
+static int osst_seek_sector(struct osst_tape * STp, struct osst_request ** aSRpnt, int sector)
 {
         struct st_partstat * STps   = &(STp->ps[STp->partition]);
 	int		     frame  = sector >> OSST_FRAME_SHIFT,
@@ -1330,10 +1383,10 @@ static int osst_seek_sector(struct osst_tape * STp, struct scsi_request ** aSRpn
  * Precondition for this function to work: all frames in the
  * drive's buffer must be of one type (DATA, MARK or EOD)!
  */
-static int osst_read_back_buffer_and_rewrite(struct osst_tape * STp, struct scsi_request ** aSRpnt,
+static int osst_read_back_buffer_and_rewrite(struct osst_tape * STp, struct osst_request ** aSRpnt,
 						unsigned int frame, unsigned int skip, int pending)
 {
-	struct scsi_request   * SRpnt = * aSRpnt;
+	struct osst_request   * SRpnt = * aSRpnt;
 	unsigned char	      * buffer, * p;
 	unsigned char		cmd[MAX_COMMAND_SIZE];
 	int			flag, new_frame, i;
@@ -1477,8 +1530,8 @@ static int osst_read_back_buffer_and_rewrite(struct osst_tape * STp, struct scsi
 					SRpnt = osst_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE, STp->timeout,
 												MAX_RETRIES, 1);
 
-					if (SRpnt->sr_sense_buffer[2] == 2 && SRpnt->sr_sense_buffer[12] == 4 &&
-					    (SRpnt->sr_sense_buffer[13] == 1 || SRpnt->sr_sense_buffer[13] == 8)) {
+					if (SRpnt->sense[2] == 2 && SRpnt->sense[12] == 4 &&
+					    (SRpnt->sense[13] == 1 || SRpnt->sense[13] == 8)) {
 						/* in the process of becoming ready */
 						msleep(100);
 						continue;
@@ -1495,17 +1548,17 @@ static int osst_read_back_buffer_and_rewrite(struct osst_tape * STp, struct scsi
 		}
 		*aSRpnt = SRpnt;
 		if (flag) {
-			if ((SRpnt->sr_sense_buffer[ 2] & 0x0f) == 13 &&
-			     SRpnt->sr_sense_buffer[12]         ==  0 &&
-			     SRpnt->sr_sense_buffer[13]         ==  2) {
+			if ((SRpnt->sense[ 2] & 0x0f) == 13 &&
+			     SRpnt->sense[12]         ==  0 &&
+			     SRpnt->sense[13]         ==  2) {
 				printk(KERN_ERR "%s:E: Volume overflow in write error recovery\n", name);
 				vfree(buffer);
 				return (-EIO);			/* hit end of tape = fail */
 			}
-			i = ((SRpnt->sr_sense_buffer[3] << 24) |
-			     (SRpnt->sr_sense_buffer[4] << 16) |
-			     (SRpnt->sr_sense_buffer[5] <<  8) |
-			      SRpnt->sr_sense_buffer[6]        ) - new_frame;
+			i = ((SRpnt->sense[3] << 24) |
+			     (SRpnt->sense[4] << 16) |
+			     (SRpnt->sense[5] <<  8) |
+			      SRpnt->sense[6]        ) - new_frame;
 			p = &buffer[i * OS_DATA_SIZE];
 #if DEBUG
 			printk(OSST_DEB_MSG "%s:D: Additional write error at %d\n", name, new_frame+i);
@@ -1528,11 +1581,11 @@ static int osst_read_back_buffer_and_rewrite(struct osst_tape * STp, struct scsi
 	return 0;
 }
 
-static int osst_reposition_and_retry(struct osst_tape * STp, struct scsi_request ** aSRpnt,
+static int osst_reposition_and_retry(struct osst_tape * STp, struct osst_request ** aSRpnt,
 					unsigned int frame, unsigned int skip, int pending)
 {
 	unsigned char		cmd[MAX_COMMAND_SIZE];
-	struct scsi_request   * SRpnt;
+	struct osst_request   * SRpnt;
 	char		      * name      = tape_name(STp);
 	int			expected  = 0;
 	int			attempts  = 1000 / skip;
@@ -1584,9 +1637,9 @@ static int osst_reposition_and_retry(struct osst_tape * STp, struct scsi_request
 			*aSRpnt = SRpnt;
 
 			if (STp->buffer->syscall_result) {		/* additional write error */
-				if ((SRpnt->sr_sense_buffer[ 2] & 0x0f) == 13 &&
-				     SRpnt->sr_sense_buffer[12]         ==  0 &&
-				     SRpnt->sr_sense_buffer[13]         ==  2) {
+				if ((SRpnt->sense[ 2] & 0x0f) == 13 &&
+				     SRpnt->sense[12]         ==  0 &&
+				     SRpnt->sense[13]         ==  2) {
 					printk(KERN_ERR
 					       "%s:E: Volume overflow in write error recovery\n",
 					       name);
@@ -1631,9 +1684,9 @@ static int osst_reposition_and_retry(struct osst_tape * STp, struct scsi_request
  * Error recovery algorithm for the OnStream tape.
  */
 
-static int osst_write_error_recovery(struct osst_tape * STp, struct scsi_request ** aSRpnt, int pending)
+static int osst_write_error_recovery(struct osst_tape * STp, struct osst_request ** aSRpnt, int pending)
 {
-	struct scsi_request * SRpnt  = * aSRpnt;
+	struct osst_request * SRpnt  = * aSRpnt;
 	struct st_partstat  * STps   = & STp->ps[STp->partition];
 	char		    * name   = tape_name(STp);
 	int		      retval = 0;
@@ -1642,20 +1695,20 @@ static int osst_write_error_recovery(struct osst_tape * STp, struct scsi_request
 
 	rw_state = STps->rw;
 
-	if ((SRpnt->sr_sense_buffer[ 2] & 0x0f) != 3
-	  || SRpnt->sr_sense_buffer[12]         != 12
-	  || SRpnt->sr_sense_buffer[13]         != 0) {
+	if ((SRpnt->sense[ 2] & 0x0f) != 3
+	  || SRpnt->sense[12]         != 12
+	  || SRpnt->sense[13]         != 0) {
 #if DEBUG
 		printk(OSST_DEB_MSG "%s:D: Write error recovery cannot handle %02x:%02x:%02x\n", name,
-			SRpnt->sr_sense_buffer[2], SRpnt->sr_sense_buffer[12], SRpnt->sr_sense_buffer[13]);
+			SRpnt->sense[2], SRpnt->sense[12], SRpnt->sense[13]);
 #endif
 		return (-EIO);
 	}
-	frame =	(SRpnt->sr_sense_buffer[3] << 24) |
-		(SRpnt->sr_sense_buffer[4] << 16) |
-		(SRpnt->sr_sense_buffer[5] <<  8) |
-		 SRpnt->sr_sense_buffer[6];
-	skip  =  SRpnt->sr_sense_buffer[9];
+	frame =	(SRpnt->sense[3] << 24) |
+		(SRpnt->sense[4] << 16) |
+		(SRpnt->sense[5] <<  8) |
+		 SRpnt->sense[6];
+	skip  =  SRpnt->sense[9];
  
 #if DEBUG
 	printk(OSST_DEB_MSG "%s:D: Detected physical bad frame at %u, advised to skip %d\n", name, frame, skip);
@@ -1710,7 +1763,7 @@ static int osst_write_error_recovery(struct osst_tape * STp, struct scsi_request
 	return retval;
 }
 
-static int osst_space_over_filemarks_backward(struct osst_tape * STp, struct scsi_request ** aSRpnt,
+static int osst_space_over_filemarks_backward(struct osst_tape * STp, struct osst_request ** aSRpnt,
 								 int mt_op, int mt_count)
 {
 	char  * name = tape_name(STp);
@@ -1809,7 +1862,7 @@ found:
  *
  * Just scans for the filemark sequentially.
  */
-static int osst_space_over_filemarks_forward_slow(struct osst_tape * STp, struct scsi_request ** aSRpnt,
+static int osst_space_over_filemarks_forward_slow(struct osst_tape * STp, struct osst_request ** aSRpnt,
 								     int mt_op, int mt_count)
 {
 	int	cnt = 0;
@@ -1863,7 +1916,7 @@ static int osst_space_over_filemarks_forward_slow(struct osst_tape * STp, struct
 /*
  * Fast linux specific version of OnStream FSF
  */
-static int osst_space_over_filemarks_forward_fast(struct osst_tape * STp, struct scsi_request ** aSRpnt,
+static int osst_space_over_filemarks_forward_fast(struct osst_tape * STp, struct osst_request ** aSRpnt,
 								     int mt_op, int mt_count)
 {
 	char  * name = tape_name(STp);
@@ -2014,10 +2067,10 @@ static int osst_space_over_filemarks_forward_fast(struct osst_tape * STp, struct
  * to test the error recovery mechanism.
  */
 #if DEBUG
-static void osst_set_retries(struct osst_tape * STp, struct scsi_request ** aSRpnt, int retries)
+static void osst_set_retries(struct osst_tape * STp, struct osst_request ** aSRpnt, int retries)
 {
 	unsigned char		cmd[MAX_COMMAND_SIZE];
-	struct scsi_request   * SRpnt  = * aSRpnt;
+	struct osst_request   * SRpnt  = * aSRpnt;
 	char		      * name   = tape_name(STp);
 
 	memset(cmd, 0, MAX_COMMAND_SIZE);
@@ -2046,7 +2099,7 @@ static void osst_set_retries(struct osst_tape * STp, struct scsi_request ** aSRp
 #endif
 
 
-static int osst_write_filemark(struct osst_tape * STp, struct scsi_request ** aSRpnt)
+static int osst_write_filemark(struct osst_tape * STp, struct osst_request ** aSRpnt)
 {
 	int	result;
 	int	this_mark_ppos = STp->first_frame_position;
@@ -2074,7 +2127,7 @@ static int osst_write_filemark(struct osst_tape * STp, struct scsi_request ** aS
 	return result;
 }
 
-static int osst_write_eod(struct osst_tape * STp, struct scsi_request ** aSRpnt)
+static int osst_write_eod(struct osst_tape * STp, struct osst_request ** aSRpnt)
 {
 	int	result;
 #if DEBUG
@@ -2097,7 +2150,7 @@ static int osst_write_eod(struct osst_tape * STp, struct scsi_request ** aSRpnt)
 	return result;
 }
 
-static int osst_write_filler(struct osst_tape * STp, struct scsi_request ** aSRpnt, int where, int count)
+static int osst_write_filler(struct osst_tape * STp, struct osst_request ** aSRpnt, int where, int count)
 {
 	char * name = tape_name(STp);
 
@@ -2122,7 +2175,7 @@ static int osst_write_filler(struct osst_tape * STp, struct scsi_request ** aSRp
 	return osst_flush_drive_buffer(STp, aSRpnt);
 }
 
-static int __osst_write_header(struct osst_tape * STp, struct scsi_request ** aSRpnt, int where, int count)
+static int __osst_write_header(struct osst_tape * STp, struct osst_request ** aSRpnt, int where, int count)
 {
 	char * name = tape_name(STp);
 	int     result;
@@ -2149,7 +2202,7 @@ static int __osst_write_header(struct osst_tape * STp, struct scsi_request ** aS
 	return result;
 }
 
-static int osst_write_header(struct osst_tape * STp, struct scsi_request ** aSRpnt, int locate_eod)
+static int osst_write_header(struct osst_tape * STp, struct osst_request ** aSRpnt, int locate_eod)
 {
 	os_header_t * header;
 	int	      result;
@@ -2223,7 +2276,7 @@ static int osst_write_header(struct osst_tape * STp, struct scsi_request ** aSRp
 	return result;
 }
 
-static int osst_reset_header(struct osst_tape * STp, struct scsi_request ** aSRpnt)
+static int osst_reset_header(struct osst_tape * STp, struct osst_request ** aSRpnt)
 {
 	if (STp->header_cache != NULL)
 		memset(STp->header_cache, 0, sizeof(os_header_t));
@@ -2236,7 +2289,7 @@ static int osst_reset_header(struct osst_tape * STp, struct scsi_request ** aSRp
 	return osst_write_header(STp, aSRpnt, 1);
 }
 
-static int __osst_analyze_headers(struct osst_tape * STp, struct scsi_request ** aSRpnt, int ppos)
+static int __osst_analyze_headers(struct osst_tape * STp, struct osst_request ** aSRpnt, int ppos)
 {
 	char        * name = tape_name(STp);
 	os_header_t * header;
@@ -2413,7 +2466,7 @@ static int __osst_analyze_headers(struct osst_tape * STp, struct scsi_request **
 	return 1;
 }
 
-static int osst_analyze_headers(struct osst_tape * STp, struct scsi_request ** aSRpnt)
+static int osst_analyze_headers(struct osst_tape * STp, struct osst_request ** aSRpnt)
 {
 	int	position, ppos;
 	int	first, last;
@@ -2468,7 +2521,7 @@ static int osst_analyze_headers(struct osst_tape * STp, struct scsi_request ** a
 	return 1;
 }
 
-static int osst_verify_position(struct osst_tape * STp, struct scsi_request ** aSRpnt)
+static int osst_verify_position(struct osst_tape * STp, struct osst_request ** aSRpnt)
 {
 	int	frame_position  = STp->first_frame_position;
 	int	frame_seq_numbr = STp->frame_seq_number;
@@ -2544,11 +2597,11 @@ static unsigned int osst_parse_firmware_rev (const char * str)
 /*
  * Configure the OnStream SCII tape drive for default operation
  */
-static int osst_configure_onstream(struct osst_tape *STp, struct scsi_request ** aSRpnt)
+static int osst_configure_onstream(struct osst_tape *STp, struct osst_request ** aSRpnt)
 {
 	unsigned char                  cmd[MAX_COMMAND_SIZE];
 	char                         * name = tape_name(STp);
-	struct scsi_request                 * SRpnt = * aSRpnt;
+	struct osst_request          * SRpnt = * aSRpnt;
 	osst_mode_parameter_header_t * header;
 	osst_block_size_page_t       * bs;
 	osst_capabilities_page_t     * cp;
@@ -2715,7 +2768,7 @@ static int osst_configure_onstream(struct osst_tape *STp, struct scsi_request **
 
 /* Step over EOF if it has been inadvertently crossed (ioctl not used because
    it messes up the block number). */
-static int cross_eof(struct osst_tape *STp, struct scsi_request ** aSRpnt, int forward)
+static int cross_eof(struct osst_tape *STp, struct osst_request ** aSRpnt, int forward)
 {
 	int	result;
 	char  * name = tape_name(STp);
@@ -2744,10 +2797,10 @@ static int cross_eof(struct osst_tape *STp, struct scsi_request ** aSRpnt, int f
 
 /* Get the tape position. */
 
-static int osst_get_frame_position(struct osst_tape *STp, struct scsi_request ** aSRpnt)
+static int osst_get_frame_position(struct osst_tape *STp, struct osst_request ** aSRpnt)
 {
 	unsigned char		scmd[MAX_COMMAND_SIZE];
-	struct scsi_request   * SRpnt;
+	struct osst_request   * SRpnt;
 	int			result = 0;
 	char    	      * name   = tape_name(STp);
 
@@ -2772,14 +2825,14 @@ static int osst_get_frame_position(struct osst_tape *STp, struct scsi_request **
 	*aSRpnt = SRpnt;
 
 	if (STp->buffer->syscall_result)
-		result = ((SRpnt->sr_sense_buffer[2] & 0x0f) == 3) ? -EIO : -EINVAL;	/* 3: Write Error */
+		result = ((SRpnt->sense[2] & 0x0f) == 3) ? -EIO : -EINVAL;	/* 3: Write Error */
 
 	if (result == -EINVAL)
 		printk(KERN_ERR "%s:E: Can't read tape position.\n", name);
 	else {
 		if (result == -EIO) {	/* re-read position - this needs to preserve media errors */
 			unsigned char mysense[16];
-			memcpy (mysense, SRpnt->sr_sense_buffer, 16);
+			memcpy (mysense, SRpnt->sense, 16);
 			memset (scmd, 0, MAX_COMMAND_SIZE);
 			scmd[0] = READ_POSITION;
 			STp->buffer->b_data = mybuf; STp->buffer->buffer_size = 24;
@@ -2788,10 +2841,10 @@ static int osst_get_frame_position(struct osst_tape *STp, struct scsi_request **
 #if DEBUG
 			printk(OSST_DEB_MSG "%s:D: Reread position, reason=[%02x:%02x:%02x], result=[%s%02x:%02x:%02x]\n",
 					name, mysense[2], mysense[12], mysense[13], STp->buffer->syscall_result?"":"ok:",
-					SRpnt->sr_sense_buffer[2],SRpnt->sr_sense_buffer[12],SRpnt->sr_sense_buffer[13]);
+					SRpnt->sense[2],SRpnt->sense[12],SRpnt->sense[13]);
 #endif
 			if (!STp->buffer->syscall_result)
-				memcpy (SRpnt->sr_sense_buffer, mysense, 16);
+				memcpy (SRpnt->sense, mysense, 16);
 			else
 				printk(KERN_WARNING "%s:W: Double error in get position\n", name);
 		}
@@ -2828,10 +2881,10 @@ static int osst_get_frame_position(struct osst_tape *STp, struct scsi_request **
 
 
 /* Set the tape block */
-static int osst_set_frame_position(struct osst_tape *STp, struct scsi_request ** aSRpnt, int ppos, int skip)
+static int osst_set_frame_position(struct osst_tape *STp, struct osst_request ** aSRpnt, int ppos, int skip)
 {
 	unsigned char		scmd[MAX_COMMAND_SIZE];
-	struct scsi_request   * SRpnt;
+	struct osst_request   * SRpnt;
 	struct st_partstat    * STps;
 	int			result = 0;
 	int			pp     = (ppos == 3000 && !skip)? 0 : ppos;
@@ -2886,7 +2939,7 @@ static int osst_set_frame_position(struct osst_tape *STp, struct scsi_request **
 	return result;
 }
 
-static int osst_write_trailer(struct osst_tape *STp, struct scsi_request ** aSRpnt, int leave_at_EOT)
+static int osst_write_trailer(struct osst_tape *STp, struct osst_request ** aSRpnt, int leave_at_EOT)
 {
 	struct st_partstat * STps = &(STp->ps[STp->partition]);
 	int result = 0;
@@ -2913,12 +2966,12 @@ out:
 /* osst versions of st functions - augmented and stripped to suit OnStream only */
 
 /* Flush the write buffer (never need to write if variable blocksize). */
-static int osst_flush_write_buffer(struct osst_tape *STp, struct scsi_request ** aSRpnt)
+static int osst_flush_write_buffer(struct osst_tape *STp, struct osst_request ** aSRpnt)
 {
 	int			offset, transfer, blks = 0;
 	int			result = 0;
 	unsigned char		cmd[MAX_COMMAND_SIZE];
-	struct scsi_request   * SRpnt = *aSRpnt;
+	struct osst_request   * SRpnt = *aSRpnt;
 	struct st_partstat    * STps;
 	char		      * name = tape_name(STp);
 
@@ -2926,13 +2979,13 @@ static int osst_flush_write_buffer(struct osst_tape *STp, struct scsi_request **
 		if (SRpnt == (STp->buffer)->last_SRpnt)
 #if DEBUG
 			{ printk(OSST_DEB_MSG
-	 "%s:D: aSRpnt points to scsi_request that write_behind_check will release -- cleared\n", name);
+	 "%s:D: aSRpnt points to osst_request that write_behind_check will release -- cleared\n", name);
 #endif
 			*aSRpnt = SRpnt = NULL;
 #if DEBUG
 			} else if (SRpnt)
 				printk(OSST_DEB_MSG
-	 "%s:D: aSRpnt does not point to scsi_request that write_behind_check will release -- strange\n", name);
+	 "%s:D: aSRpnt does not point to osst_request that write_behind_check will release -- strange\n", name);
 #endif	
 		osst_write_behind_check(STp);
 		if ((STp->buffer)->syscall_result) {
@@ -3010,12 +3063,12 @@ static int osst_flush_write_buffer(struct osst_tape *STp, struct scsi_request **
 #if DEBUG
 			printk(OSST_DEB_MSG
 				"%s:D: write sense [0]=0x%02x [2]=%02x [12]=%02x [13]=%02x\n",
-				name, SRpnt->sr_sense_buffer[0], SRpnt->sr_sense_buffer[2],
-				SRpnt->sr_sense_buffer[12], SRpnt->sr_sense_buffer[13]);
+				name, SRpnt->sense[0], SRpnt->sense[2],
+				SRpnt->sense[12], SRpnt->sense[13]);
 #endif
-			if ((SRpnt->sr_sense_buffer[0] & 0x70) == 0x70 &&
-			    (SRpnt->sr_sense_buffer[2] & 0x40) && /* FIXME - SC-30 drive doesn't assert EOM bit */
-			    (SRpnt->sr_sense_buffer[2] & 0x0f) == NO_SENSE) {
+			if ((SRpnt->sense[0] & 0x70) == 0x70 &&
+			    (SRpnt->sense[2] & 0x40) && /* FIXME - SC-30 drive doesn't assert EOM bit */
+			    (SRpnt->sense[2] & 0x0f) == NO_SENSE) {
 				STp->dirty = 0;
 				(STp->buffer)->buffer_bytes = 0;
 				result = (-ENOSPC);
@@ -3043,7 +3096,7 @@ static int osst_flush_write_buffer(struct osst_tape *STp, struct scsi_request **
 
 /* Flush the tape buffer. The tape will be positioned correctly unless
    seek_next is true. */
-static int osst_flush_buffer(struct osst_tape * STp, struct scsi_request ** aSRpnt, int seek_next)
+static int osst_flush_buffer(struct osst_tape * STp, struct osst_request ** aSRpnt, int seek_next)
 {
 	struct st_partstat * STps;
 	int    backspace = 0, result = 0;
@@ -3105,10 +3158,10 @@ static int osst_flush_buffer(struct osst_tape * STp, struct scsi_request ** aSRp
 	return result;
 }
 
-static int osst_write_frame(struct osst_tape * STp, struct scsi_request ** aSRpnt, int synchronous)
+static int osst_write_frame(struct osst_tape * STp, struct osst_request ** aSRpnt, int synchronous)
 {
 	unsigned char		cmd[MAX_COMMAND_SIZE];
-	struct scsi_request   * SRpnt;
+	struct osst_request   * SRpnt;
 	int			blks;
 #if DEBUG
 	char		      * name = tape_name(STp);
@@ -3169,9 +3222,9 @@ static int osst_write_frame(struct osst_tape * STp, struct scsi_request ** aSRpn
 			if (debugging)
 				printk(OSST_DEB_MSG "%s:D: Error on write:\n", name);
 #endif
-			if ((SRpnt->sr_sense_buffer[0] & 0x70) == 0x70 &&
-			    (SRpnt->sr_sense_buffer[2] & 0x40)) {
-				if ((SRpnt->sr_sense_buffer[2] & 0x0f) == VOLUME_OVERFLOW)
+			if ((SRpnt->sense[0] & 0x70) == 0x70 &&
+			    (SRpnt->sense[2] & 0x40)) {
+				if ((SRpnt->sense[2] & 0x0f) == VOLUME_OVERFLOW)
 					return (-ENOSPC);
 			}
 			else {
@@ -3188,7 +3241,7 @@ static int osst_write_frame(struct osst_tape * STp, struct scsi_request ** aSRpn
 	return 0;
 }
 
-/* Lock or unlock the drive door. Don't use when struct scsi_request allocated. */
+/* Lock or unlock the drive door. Don't use when struct osst_request allocated. */
 static int do_door_lock(struct osst_tape * STp, int do_lock)
 {
 	int retval, cmd;
@@ -3236,7 +3289,7 @@ static ssize_t osst_write(struct file * filp, const char __user * buf, size_t co
 	int		      write_threshold;
 	int		      doing_write = 0;
 	const char   __user * b_point;
-	struct scsi_request * SRpnt = NULL;
+	struct osst_request * SRpnt = NULL;
 	struct st_modedef   * STm;
 	struct st_partstat  * STps;
 	struct osst_tape    * STp  = filp->private_data;
@@ -3427,7 +3480,7 @@ if (SRpnt) printk(KERN_ERR "%s:A: Not supposed to have SRpnt at line %d\n", name
 #if DEBUG
 	if (debugging)
 		printk(OSST_DEB_MSG "%s:D: Writing %d bytes to file %d block %d lblk %d fseq %d fppos %d\n",
-				name, count, STps->drv_file, STps->drv_block,
+				name, (int) count, STps->drv_file, STps->drv_block,
 				STp->logical_blk_num, STp->frame_seq_number, STp->first_frame_position);
 #endif
 	b_point = buf;
@@ -3463,7 +3516,7 @@ if (SRpnt) printk(KERN_ERR "%s:A: Not supposed to have SRpnt at line %d\n", name
 #if DEBUG
 				if (debugging)
 				      printk(OSST_DEB_MSG "%s:D: EOM with %d bytes unwritten.\n",
-							     name, transfer);
+							     name, (int) transfer);
 #endif
 			}
 			else {
@@ -3481,7 +3534,7 @@ if (SRpnt) printk(KERN_ERR "%s:A: Not supposed to have SRpnt at line %d\n", name
 			
 		if (retval < 0) {
 			if (SRpnt != NULL) {
-				scsi_release_request(SRpnt);
+				osst_release_request(SRpnt);
 				SRpnt = NULL;
 			}
 			STp->buffer->buffer_bytes = 0;
@@ -3543,7 +3596,7 @@ if (SRpnt) printk(KERN_ERR "%s:A: Not supposed to have SRpnt at line %d\n", name
 	retval = total;
 
 out:
-	if (SRpnt != NULL) scsi_release_request(SRpnt);
+	if (SRpnt != NULL) osst_release_request(SRpnt);
 
 	up(&STp->lock);
 
@@ -3559,7 +3612,7 @@ static ssize_t osst_read(struct file * filp, char __user * buf, size_t count, lo
 	int		      special;
 	struct st_modedef   * STm;
 	struct st_partstat  * STps;
-	struct scsi_request * SRpnt = NULL;
+	struct osst_request * SRpnt = NULL;
 	struct osst_tape    * STp   = filp->private_data;
 	char		    * name  = tape_name(STp);
 
@@ -3667,7 +3720,7 @@ static ssize_t osst_read(struct file * filp, char __user * buf, size_t count, lo
 #if DEBUG
 			if (debugging && STps->eof != ST_NOEOF)
 			    printk(OSST_DEB_MSG "%s:D: EOF up (%d). Left %d, needed %d.\n", name,
-						 STps->eof, (STp->buffer)->buffer_bytes, count - total);
+						 STps->eof, (STp->buffer)->buffer_bytes, (int) (count - total));
 #endif
 		       	/* force multiple of block size, note block_size may have been adjusted */
 			transfer = (((STp->buffer)->buffer_bytes < count - total ?
@@ -3728,7 +3781,7 @@ static ssize_t osst_read(struct file * filp, char __user * buf, size_t count, lo
 	retval = total;
 
 out:
-	if (SRpnt != NULL) scsi_release_request(SRpnt);
+	if (SRpnt != NULL) osst_release_request(SRpnt);
 
 	up(&STp->lock);
 
@@ -3916,7 +3969,7 @@ static int osst_set_options(struct osst_tape *STp, long options)
 
 
 /* Internal ioctl function */
-static int osst_int_ioctl(struct osst_tape * STp, struct scsi_request ** aSRpnt,
+static int osst_int_ioctl(struct osst_tape * STp, struct osst_request ** aSRpnt,
 			     unsigned int cmd_in, unsigned long arg)
 {
 	int			timeout;
@@ -3924,7 +3977,7 @@ static int osst_int_ioctl(struct osst_tape * STp, struct scsi_request ** aSRpnt,
 	int			i, ioctl_result;
 	int			chg_eof = 1;
 	unsigned char		cmd[MAX_COMMAND_SIZE];
-	struct scsi_request   * SRpnt = * aSRpnt;
+	struct osst_request   * SRpnt = * aSRpnt;
 	struct st_partstat    * STps;
 	int			fileno, blkno, at_sm, frame_seq_numbr, logical_blk_num;
 	int			datalen = 0, direction = DMA_NONE;
@@ -4282,14 +4335,14 @@ os_bypass:
 	} else if (cmd_in == MTERASE) {
 		STp->header_ok = 0;
 	} else if (SRpnt) {  /* SCSI command was not completely successful. */
-		if (SRpnt->sr_sense_buffer[2] & 0x40) {
+		if (SRpnt->sense[2] & 0x40) {
 			STps->eof = ST_EOM_OK;
 			STps->drv_block = 0;
 		}
 		if (chg_eof)
 			STps->eof = ST_NOEOF;
 
-		if ((SRpnt->sr_sense_buffer[2] & 0x0f) == BLANK_CHECK)
+		if ((SRpnt->sense[2] & 0x0f) == BLANK_CHECK)
 			STps->eof = ST_EOD;
 
 		if (cmd_in == MTLOAD && osst_wait_for_medium(STp, &SRpnt, 60))
@@ -4307,7 +4360,7 @@ static int os_scsi_tape_open(struct inode * inode, struct file * filp)
 	unsigned short	      flags;
 	int		      i, b_size, new_session = 0, retval = 0;
 	unsigned char	      cmd[MAX_COMMAND_SIZE];
-	struct scsi_request * SRpnt = NULL;
+	struct osst_request * SRpnt = NULL;
 	struct osst_tape    * STp;
 	struct st_modedef   * STm;
 	struct st_partstat  * STps;
@@ -4415,17 +4468,17 @@ static int os_scsi_tape_open(struct inode * inode, struct file * filp)
 		retval = (STp->buffer)->syscall_result;		/* FIXME - valid? */
 		goto err_out;
 	}
-	if ((SRpnt->sr_sense_buffer[0] & 0x70) == 0x70      &&
-	    (SRpnt->sr_sense_buffer[2] & 0x0f) == NOT_READY &&
-	     SRpnt->sr_sense_buffer[12]        == 4         ) {
+	if ((SRpnt->sense[0] & 0x70) == 0x70      &&
+	    (SRpnt->sense[2] & 0x0f) == NOT_READY &&
+	     SRpnt->sense[12]        == 4         ) {
 #if DEBUG
-		printk(OSST_DEB_MSG "%s:D: Unit not ready, cause %x\n", name, SRpnt->sr_sense_buffer[13]);
+		printk(OSST_DEB_MSG "%s:D: Unit not ready, cause %x\n", name, SRpnt->sense[13]);
 #endif
 		if (filp->f_flags & O_NONBLOCK) {
 			retval = -EAGAIN;
 			goto err_out;
 		}
-		if (SRpnt->sr_sense_buffer[13] == 2) {	/* initialize command required (LOAD) */
+		if (SRpnt->sense[13] == 2) {	/* initialize command required (LOAD) */
 			memset (cmd, 0, MAX_COMMAND_SIZE);
         		cmd[0] = START_STOP;
 			cmd[1] = 1;
@@ -4433,10 +4486,10 @@ static int os_scsi_tape_open(struct inode * inode, struct file * filp)
 			SRpnt = osst_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE,
 					     STp->timeout, MAX_RETRIES, 1);
 		}
-		osst_wait_ready(STp, &SRpnt, (SRpnt->sr_sense_buffer[13]==1?15:3) * 60, 0);
+		osst_wait_ready(STp, &SRpnt, (SRpnt->sense[13]==1?15:3) * 60, 0);
 	}
-	if ((SRpnt->sr_sense_buffer[0] & 0x70) == 0x70 &&
-	    (SRpnt->sr_sense_buffer[2] & 0x0f) == UNIT_ATTENTION) { /* New media? */
+	if ((SRpnt->sense[0] & 0x70) == 0x70 &&
+	    (SRpnt->sense[2] & 0x0f) == UNIT_ATTENTION) { /* New media? */
 #if DEBUG
 		printk(OSST_DEB_MSG "%s:D: Unit wants attention\n", name);
 #endif
@@ -4449,8 +4502,8 @@ static int os_scsi_tape_open(struct inode * inode, struct file * filp)
 
 			SRpnt = osst_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE,
 					     STp->timeout, MAX_RETRIES, 1);
-			if ((SRpnt->sr_sense_buffer[0] & 0x70) != 0x70 ||
-			    (SRpnt->sr_sense_buffer[2] & 0x0f) != UNIT_ATTENTION)
+			if ((SRpnt->sense[0] & 0x70) != 0x70 ||
+			    (SRpnt->sense[2] & 0x0f) != UNIT_ATTENTION)
 				break;
 		}
 
@@ -4476,7 +4529,7 @@ static int os_scsi_tape_open(struct inode * inode, struct file * filp)
 	 * open without reconfiguring and re-reading the headers
 	 */
 	if (!STp->buffer->syscall_result && STp->header_ok &&
-	    !SRpnt->sr_result && SRpnt->sr_sense_buffer[0] == 0) {
+	    !SRpnt->result && SRpnt->sense[0] == 0) {
 
 		memset(cmd, 0, MAX_COMMAND_SIZE);
 		cmd[0] = MODE_SENSE;
@@ -4515,7 +4568,7 @@ static int os_scsi_tape_open(struct inode * inode, struct file * filp)
 			}
 			STp->buffer->buffer_blocks = OS_DATA_SIZE / STp->block_size;
 			STp->fast_open = 1;
-			scsi_release_request(SRpnt);
+			osst_release_request(SRpnt);
 			return 0;
 		}
 #if DEBUG
@@ -4528,7 +4581,7 @@ static int os_scsi_tape_open(struct inode * inode, struct file * filp)
 	STp->fast_open = 0;
 
 	if ((STp->buffer)->syscall_result != 0 &&   /* in all error conditions except no medium */ 
-	    (SRpnt->sr_sense_buffer[2] != 2 || SRpnt->sr_sense_buffer[12] != 0x3A) ) {
+	    (SRpnt->sense[2] != 2 || SRpnt->sense[12] != 0x3A) ) {
 
 		memset(cmd, 0, MAX_COMMAND_SIZE);
 		cmd[0] = MODE_SELECT;
@@ -4558,11 +4611,11 @@ static int os_scsi_tape_open(struct inode * inode, struct file * filp)
 
 			SRpnt = osst_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE,
 						    STp->timeout, MAX_RETRIES, 1);
-			if ((SRpnt->sr_sense_buffer[0] & 0x70) != 0x70 ||
-			    (SRpnt->sr_sense_buffer[2] & 0x0f) == NOT_READY)
+			if ((SRpnt->sense[0] & 0x70) != 0x70 ||
+			    (SRpnt->sense[2] & 0x0f) == NOT_READY)
 			break;
 
-			if ((SRpnt->sr_sense_buffer[2] & 0x0f) == UNIT_ATTENTION) {
+			if ((SRpnt->sense[2] & 0x0f) == UNIT_ATTENTION) {
 				STp->pos_unknown = 0;
 				STp->partition = STp->new_partition = 0;
 				if (STp->can_partitions)
@@ -4586,13 +4639,13 @@ static int os_scsi_tape_open(struct inode * inode, struct file * filp)
 
 	if ((STp->buffer)->syscall_result != 0) {
 		if ((STp->device)->scsi_level >= SCSI_2 &&
-		    (SRpnt->sr_sense_buffer[0] & 0x70) == 0x70 &&
-		    (SRpnt->sr_sense_buffer[2] & 0x0f) == NOT_READY &&
-		     SRpnt->sr_sense_buffer[12] == 0x3a) { /* Check ASC */
+		    (SRpnt->sense[0] & 0x70) == 0x70 &&
+		    (SRpnt->sense[2] & 0x0f) == NOT_READY &&
+		     SRpnt->sense[12] == 0x3a) { /* Check ASC */
 			STp->ready = ST_NO_TAPE;
 		} else
 			STp->ready = ST_NOT_READY;
-		scsi_release_request(SRpnt);
+		osst_release_request(SRpnt);
 		SRpnt = NULL;
 		STp->density = 0;   	/* Clear the erroneous "residue" */
 		STp->write_prot = 0;
@@ -4652,14 +4705,14 @@ static int os_scsi_tape_open(struct inode * inode, struct file * filp)
 
 	osst_analyze_headers(STp, &SRpnt);
 
-	scsi_release_request(SRpnt);
+	osst_release_request(SRpnt);
 	SRpnt = NULL;
 
 	return 0;
 
 err_out:
 	if (SRpnt != NULL)
-		scsi_release_request(SRpnt);
+		osst_release_request(SRpnt);
 	normalize_buffer(STp->buffer);
 	STp->header_ok = 0;
 	STp->in_use = 0;
@@ -4676,7 +4729,7 @@ static int os_scsi_tape_flush(struct file * filp)
 	struct osst_tape    * STp    = filp->private_data;
 	struct st_modedef   * STm    = &(STp->modes[STp->current_mode]);
 	struct st_partstat  * STps   = &(STp->ps[STp->partition]);
-	struct scsi_request * SRpnt  = NULL;
+	struct osst_request * SRpnt  = NULL;
 	char		    * name   = tape_name(STp);
 
 	if (file_count(filp) > 1)
@@ -4739,7 +4792,7 @@ out:
 		if (result == 0 && result2 < 0)
 			result = result2;
 	}
-	if (SRpnt) scsi_release_request(SRpnt);
+	if (SRpnt) osst_release_request(SRpnt);
 
 	if (STp->abort_count || STp->recover_count) {
 		printk(KERN_INFO "%s:I:", name);
@@ -4793,7 +4846,7 @@ static int osst_ioctl(struct inode * inode,struct file * file,
 	unsigned int	      blk;
 	struct st_modedef   * STm;
 	struct st_partstat  * STps;
-	struct scsi_request * SRpnt = NULL;
+	struct osst_request * SRpnt = NULL;
 	struct osst_tape    * STp   = file->private_data;
 	char		    * name  = tape_name(STp);
 	void	    __user  * p     = (void __user *)arg;
@@ -5107,14 +5160,14 @@ static int osst_ioctl(struct inode * inode,struct file * file,
 			retval = -EFAULT;
 		goto out;
 	}
-	if (SRpnt) scsi_release_request(SRpnt);
+	if (SRpnt) osst_release_request(SRpnt);
 
 	up(&STp->lock);
 
 	return scsi_ioctl(STp->device, cmd_in, p);
 
 out:
-	if (SRpnt) scsi_release_request(SRpnt);
+	if (SRpnt) osst_release_request(SRpnt);
 
 	up(&STp->lock);
 
@@ -5667,7 +5720,7 @@ static int osst_probe(struct device *dev)
 	struct st_partstat * STps;
 	struct osst_buffer * buffer;
 	struct gendisk	   * drive;
-	int		     i, mode, dev_num;
+	int		     i, dev_num;
 
 	if (SDp->type != TYPE_TAPE || !osst_supports(SDp))
 		return -ENODEV;
@@ -5803,18 +5856,6 @@ static int osst_probe(struct device *dev)
 		snprintf(name, 8, "%s%s", "n", tape_name(tpnt));
 		osst_sysfs_add(MKDEV(OSST_MAJOR, dev_num + 128), dev, tpnt, name);
 	}
-	for (mode = 0; mode < ST_NBR_MODES; ++mode) {
-		/*  Rewind entry  */
-		devfs_mk_cdev(MKDEV(OSST_MAJOR, dev_num + (mode << 5)),
-				S_IFCHR | S_IRUGO | S_IWUGO,
-				"%s/ot%s", SDp->devfs_name, osst_formats[mode]);
-
-		/*  No-rewind entry  */
-		devfs_mk_cdev(MKDEV(OSST_MAJOR, dev_num + (mode << 5) + 128),
-				S_IFCHR | S_IRUGO | S_IWUGO,
-				"%s/ot%sn", SDp->devfs_name, osst_formats[mode]);
-	}
-	drive->number = devfs_register_tape(SDp->devfs_name);
 
 	sdev_printk(KERN_INFO, SDp,
 		"osst :I: Attached OnStream %.5s tape as %s\n",
@@ -5831,7 +5872,7 @@ static int osst_remove(struct device *dev)
 {
 	struct scsi_device * SDp = to_scsi_device(dev);
 	struct osst_tape * tpnt;
-	int i, mode;
+	int i;
 
 	if ((SDp->type != TYPE_TAPE) || (osst_nr_dev <= 0))
 		return 0;
@@ -5842,11 +5883,6 @@ static int osst_remove(struct device *dev)
 			osst_sysfs_destroy(MKDEV(OSST_MAJOR, i));
 			osst_sysfs_destroy(MKDEV(OSST_MAJOR, i+128));
 			tpnt->device = NULL;
-			for (mode = 0; mode < ST_NBR_MODES; ++mode) {
-				devfs_remove("%s/ot%s", SDp->devfs_name, osst_formats[mode]);
-				devfs_remove("%s/ot%sn", SDp->devfs_name, osst_formats[mode]);
-			}
-			devfs_unregister_tape(tpnt->drive->number);
 			put_disk(tpnt->drive);
 			os_scsi_tapes[i] = NULL;
 			osst_nr_dev--;