osst.c 181.1 KB
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/*
  SCSI Tape Driver for Linux version 1.1 and newer. See the accompanying
  file Documentation/scsi/st.txt for more information.

  History:

  OnStream SCSI Tape support (osst) cloned from st.c by
  Willem Riede (osst@riede.org) Feb 2000
  Fixes ... Kurt Garloff <garloff@suse.de> Mar 2000

  Rewritten from Dwayne Forsyth's SCSI tape driver by Kai Makisara.
  Contribution and ideas from several people including (in alphabetical
  order) Klaus Ehrenfried, Wolfgang Denk, Steve Hirsch, Andreas Koppenh"ofer,
  Michael Leodolter, Eyal Lebedinsky, J"org Weule, and Eric Youngdale.

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  Copyright 1992 - 2002 Kai Makisara / 2000 - 2006 Willem Riede
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	 email osst@riede.org

  $Header: /cvsroot/osst/Driver/osst.c,v 1.73 2005/01/01 21:13:34 wriede Exp $

  Microscopic alterations - Rik Ling, 2000/12/21
  Last st.c sync: Tue Oct 15 22:01:04 2002 by makisara
  Some small formal changes - aeb, 950809
*/

static const char * cvsid = "$Id: osst.c,v 1.73 2005/01/01 21:13:34 wriede Exp $";
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static const char * osst_version = "0.99.4";
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/* The "failure to reconnect" firmware bug */
#define OSST_FW_NEED_POLL_MIN 10601 /*(107A)*/
#define OSST_FW_NEED_POLL_MAX 10704 /*(108D)*/
#define OSST_FW_NEED_POLL(x,d) ((x) >= OSST_FW_NEED_POLL_MIN && (x) <= OSST_FW_NEED_POLL_MAX && d->host->this_id != 7)

#include <linux/module.h>

#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/proc_fs.h>
#include <linux/mm.h>
#include <linux/init.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/mtio.h>
#include <linux/ioctl.h>
#include <linux/fcntl.h>
#include <linux/spinlock.h>
#include <linux/vmalloc.h>
#include <linux/blkdev.h>
#include <linux/moduleparam.h>
#include <linux/delay.h>
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#include <linux/jiffies.h>
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#include <asm/uaccess.h>
#include <asm/dma.h>
#include <asm/system.h>

/* The driver prints some debugging information on the console if DEBUG
   is defined and non-zero. */
#define DEBUG 0

/* The message level for the debug messages is currently set to KERN_NOTICE
   so that people can easily see the messages. Later when the debugging messages
   in the drivers are more widely classified, this may be changed to KERN_DEBUG. */
#define OSST_DEB_MSG  KERN_NOTICE

#include <scsi/scsi.h>
#include <scsi/scsi_dbg.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_driver.h>
#include <scsi/scsi_eh.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_ioctl.h>

#define ST_KILOBYTE 1024

#include "st.h"
#include "osst.h"
#include "osst_options.h"
#include "osst_detect.h"

static int max_dev = 0;
static int write_threshold_kbs = 0;
static int max_sg_segs = 0;

#ifdef MODULE
MODULE_AUTHOR("Willem Riede");
MODULE_DESCRIPTION("OnStream {DI-|FW-|SC-|USB}{30|50} Tape Driver");
MODULE_LICENSE("GPL");
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MODULE_ALIAS_CHARDEV_MAJOR(OSST_MAJOR);
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module_param(max_dev, int, 0444);
MODULE_PARM_DESC(max_dev, "Maximum number of OnStream Tape Drives to attach (4)");

module_param(write_threshold_kbs, int, 0644);
MODULE_PARM_DESC(write_threshold_kbs, "Asynchronous write threshold (KB; 32)");

module_param(max_sg_segs, int, 0644);
MODULE_PARM_DESC(max_sg_segs, "Maximum number of scatter/gather segments to use (9)");
#else
static struct osst_dev_parm {
       char   *name;
       int    *val;
} parms[] __initdata = {
       { "max_dev",             &max_dev             },
       { "write_threshold_kbs", &write_threshold_kbs },
       { "max_sg_segs",         &max_sg_segs         }
};
#endif

/* 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)

/* The buffer size should fit into the 24 bits for length in the
   6-byte SCSI read and write commands. */
#if OSST_BUFFER_SIZE >= (2 << 24 - 1)
#error "Buffer size should not exceed (2 << 24 - 1) bytes!"
#endif

#if DEBUG
static int debugging = 1;
/* uncomment define below to test error recovery */
// #define OSST_INJECT_ERRORS 1 
#endif

/* Do not retry! The drive firmware already retries when appropriate,
   and when it tries to tell us something, we had better listen... */
#define MAX_RETRIES 0

#define NO_TAPE  NOT_READY

#define OSST_WAIT_POSITION_COMPLETE   (HZ > 200 ? HZ / 200 : 1)
#define OSST_WAIT_WRITE_COMPLETE      (HZ / 12)
#define OSST_WAIT_LONG_WRITE_COMPLETE (HZ / 2)
	
#define OSST_TIMEOUT (200 * HZ)
#define OSST_LONG_TIMEOUT (1800 * HZ)

#define TAPE_NR(x) (iminor(x) & ~(-1 << ST_MODE_SHIFT))
#define TAPE_MODE(x) ((iminor(x) & ST_MODE_MASK) >> ST_MODE_SHIFT)
#define TAPE_REWIND(x) ((iminor(x) & 0x80) == 0)
#define TAPE_IS_RAW(x) (TAPE_MODE(x) & (ST_NBR_MODES >> 1))

/* Internal ioctl to set both density (uppermost 8 bits) and blocksize (lower
   24 bits) */
#define SET_DENS_AND_BLK 0x10001

static int osst_buffer_size       = OSST_BUFFER_SIZE;
static int osst_write_threshold   = OSST_WRITE_THRESHOLD;
static int osst_max_sg_segs       = OSST_MAX_SG;
static int osst_max_dev           = OSST_MAX_TAPES;
static int osst_nr_dev;

static struct osst_tape **os_scsi_tapes = NULL;
static DEFINE_RWLOCK(os_scsi_tapes_lock);

static int modes_defined = 0;

static struct osst_buffer *new_tape_buffer(int, int, int);
static int enlarge_buffer(struct osst_buffer *, int);
static void normalize_buffer(struct osst_buffer *);
static int append_to_buffer(const char __user *, struct osst_buffer *, int);
static int from_buffer(struct osst_buffer *, char __user *, int);
static int osst_zero_buffer_tail(struct osst_buffer *);
static int osst_copy_to_buffer(struct osst_buffer *, unsigned char *);
static int osst_copy_from_buffer(struct osst_buffer *, unsigned char *);

static int osst_probe(struct device *);
static int osst_remove(struct device *);

static struct scsi_driver osst_template = {
	.owner			= THIS_MODULE,
	.gendrv = {
		.name		=  "osst",
		.probe		= osst_probe,
		.remove		= osst_remove,
	}
};

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static int osst_int_ioctl(struct osst_tape *STp, struct osst_request ** aSRpnt,
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			    unsigned int cmd_in, unsigned long arg);

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static int osst_set_frame_position(struct osst_tape *STp, struct osst_request ** aSRpnt, int frame, int skip);
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static int osst_get_frame_position(struct osst_tape *STp, struct osst_request ** aSRpnt);
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static int osst_flush_write_buffer(struct osst_tape *STp, struct osst_request ** aSRpnt);
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static int osst_write_error_recovery(struct osst_tape * STp, struct osst_request ** aSRpnt, int pending);
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static inline char *tape_name(struct osst_tape *tape)
{
	return tape->drive->disk_name;
}

/* Routines that handle the interaction with mid-layer SCSI routines */

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/* 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;
		}
	}
}

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/* Convert the result to success code */
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static int osst_chk_result(struct osst_tape * STp, struct osst_request * SRpnt)
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{
	char *name = tape_name(STp);
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	int result = SRpnt->result;
	u8 * sense = SRpnt->sense, scode;
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#if DEBUG
	const char *stp;
#endif
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	struct st_cmdstatus *cmdstatp;
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	if (!result)
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		return 0;
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	cmdstatp = &STp->buffer->cmdstat;
	osst_analyze_sense(SRpnt, cmdstatp);

	if (cmdstatp->have_sense)
		scode = STp->buffer->cmdstat.sense_hdr.sense_key;
	else
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		scode = 0;
#if DEBUG
	if (debugging) {
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		printk(OSST_DEB_MSG "%s:D: Error: %x, cmd: %x %x %x %x %x %x\n",
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		   name, result,
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		   SRpnt->cmd[0], SRpnt->cmd[1], SRpnt->cmd[2],
		   SRpnt->cmd[3], SRpnt->cmd[4], SRpnt->cmd[5]);
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		if (scode) printk(OSST_DEB_MSG "%s:D: Sense: %02x, ASC: %02x, ASCQ: %02x\n",
			       	name, scode, sense[12], sense[13]);
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		if (cmdstatp->have_sense)
			__scsi_print_sense("osst ", SRpnt->sense, SCSI_SENSE_BUFFERSIZE);
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	}
	else
#endif
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	if (cmdstatp->have_sense && (
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		 scode != NO_SENSE &&
		 scode != RECOVERED_ERROR &&
/*      	 scode != UNIT_ATTENTION && */
		 scode != BLANK_CHECK &&
		 scode != VOLUME_OVERFLOW &&
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		 SRpnt->cmd[0] != MODE_SENSE &&
		 SRpnt->cmd[0] != TEST_UNIT_READY)) { /* Abnormal conditions for tape */
		if (cmdstatp->have_sense) {
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			printk(KERN_WARNING "%s:W: Command with sense data:\n", name);
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			__scsi_print_sense("osst ", SRpnt->sense, SCSI_SENSE_BUFFERSIZE);
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		}
		else {
			static	int	notyetprinted = 1;

			printk(KERN_WARNING
			     "%s:W: Warning %x (sugg. bt 0x%x, driver bt 0x%x, host bt 0x%x).\n",
			     name, result, suggestion(result), driver_byte(result) & DRIVER_MASK,
			     host_byte(result));
			if (notyetprinted) {
				notyetprinted = 0;
				printk(KERN_INFO
					"%s:I: This warning may be caused by your scsi controller,\n", name);
				printk(KERN_INFO
					"%s:I: it has been reported with some Buslogic cards.\n", name);
			}
		}
	}
	STp->pos_unknown |= STp->device->was_reset;

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	if (cmdstatp->have_sense && scode == RECOVERED_ERROR) {
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		STp->recover_count++;
		STp->recover_erreg++;
#if DEBUG
		if (debugging) {
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			if (SRpnt->cmd[0] == READ_6)
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				stp = "read";
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			else if (SRpnt->cmd[0] == WRITE_6)
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				stp = "write";
			else
				stp = "ioctl";
			printk(OSST_DEB_MSG "%s:D: Recovered %s error (%d).\n", name, stp,
					     STp->recover_count);
		}
#endif
		if ((sense[2] & 0xe0) == 0)
			return 0;
	}
	return (-EIO);
}


/* Wakeup from interrupt */
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static void osst_sleep_done(void *data, char *sense, int result, int resid)
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{
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	struct osst_request *SRpnt = data;
	struct osst_tape *STp = SRpnt->stp;
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	memcpy(SRpnt->sense, sense, SCSI_SENSE_BUFFERSIZE);
	STp->buffer->cmdstat.midlevel_result = SRpnt->result = result;
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#if DEBUG
	STp->write_pending = 0;
#endif
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	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);
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}

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static void osst_release_request(struct osst_request *streq)
{
	kfree(streq);
}
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/* 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. */
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static	struct osst_request * osst_do_scsi(struct osst_request *SRpnt, struct osst_tape *STp, 
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	unsigned char *cmd, int bytes, int direction, int timeout, int retries, int do_wait)
{
	unsigned char *bp;
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	unsigned short use_sg;
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#ifdef OSST_INJECT_ERRORS
	static   int   inject = 0;
	static   int   repeat = 0;
#endif
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	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;
	}

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	if (SRpnt == NULL) {
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		SRpnt = osst_allocate_request();
		if (SRpnt == NULL) {
			printk(KERN_ERR "%s: Can't allocate SCSI request.\n",
				     tape_name(STp));
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			if (signal_pending(current))
				(STp->buffer)->syscall_result = (-EINTR);
			else
				(STp->buffer)->syscall_result = (-EBUSY);
			return NULL;
		}
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		SRpnt->stp = STp;
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	}

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	/* 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) {
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		bp = (char *)&(STp->buffer->sg[0]);
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		if (STp->buffer->sg_segs < use_sg)
			use_sg = STp->buffer->sg_segs;
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	}
	else
		bp = (STp->buffer)->b_data;

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	memcpy(SRpnt->cmd, cmd, sizeof(SRpnt->cmd));
	STp->buffer->cmdstat.have_sense = 0;
	STp->buffer->syscall_result = 0;
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	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;
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		STp->buffer->syscall_result = osst_chk_result(STp, SRpnt);
#ifdef OSST_INJECT_ERRORS
		if (STp->buffer->syscall_result == 0 &&
		    cmd[0] == READ_6 &&
		    cmd[4] && 
		    ( (++ inject % 83) == 29  ||
		      (STp->first_frame_position == 240 
			         /* or STp->read_error_frame to fail again on the block calculated above */ &&
				 ++repeat < 3))) {
			printk(OSST_DEB_MSG "%s:D: Injecting read error\n", tape_name(STp));
			STp->buffer->last_result_fatal = 1;
		}
#endif
	}
	return SRpnt;
}


/* Handle the write-behind checking (downs the semaphore) */
static void osst_write_behind_check(struct osst_tape *STp)
{
	struct osst_buffer * STbuffer;

	STbuffer = STp->buffer;

#if DEBUG
	if (STp->write_pending)
		STp->nbr_waits++;
	else
		STp->nbr_finished++;
#endif
	wait_for_completion(&(STp->wait));
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	STp->buffer->last_SRpnt->waiting = NULL;
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	STp->buffer->syscall_result = osst_chk_result(STp, STp->buffer->last_SRpnt);

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	if (STp->buffer->syscall_result)
		STp->buffer->syscall_result =
			osst_write_error_recovery(STp, &(STp->buffer->last_SRpnt), 1);
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	else
		STp->first_frame_position++;

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	osst_release_request(STp->buffer->last_SRpnt);
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	if (STbuffer->writing < STbuffer->buffer_bytes)
		printk(KERN_WARNING "osst :A: write_behind_check: something left in buffer!\n");

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	STbuffer->last_SRpnt = NULL;
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	STbuffer->buffer_bytes -= STbuffer->writing;
	STbuffer->writing = 0;

	return;
}



/* Onstream specific Routines */
/*
 * Initialize the OnStream AUX
 */
static void osst_init_aux(struct osst_tape * STp, int frame_type, int frame_seq_number,
					 int logical_blk_num, int blk_sz, int blk_cnt)
{
	os_aux_t       *aux = STp->buffer->aux;
	os_partition_t *par = &aux->partition;
	os_dat_t       *dat = &aux->dat;

	if (STp->raw) return;

	memset(aux, 0, sizeof(*aux));
	aux->format_id = htonl(0);
	memcpy(aux->application_sig, "LIN4", 4);
	aux->hdwr = htonl(0);
	aux->frame_type = frame_type;

	switch (frame_type) {
	  case	OS_FRAME_TYPE_HEADER:
		aux->update_frame_cntr    = htonl(STp->update_frame_cntr);
		par->partition_num        = OS_CONFIG_PARTITION;
		par->par_desc_ver         = OS_PARTITION_VERSION;
		par->wrt_pass_cntr        = htons(0xffff);
		/* 0-4 = reserved, 5-9 = header, 2990-2994 = header, 2995-2999 = reserved */
		par->first_frame_ppos     = htonl(0);
		par->last_frame_ppos      = htonl(0xbb7);
		aux->frame_seq_num        = htonl(0);
		aux->logical_blk_num_high = htonl(0);
		aux->logical_blk_num      = htonl(0);
		aux->next_mark_ppos       = htonl(STp->first_mark_ppos);
		break;
	  case	OS_FRAME_TYPE_DATA:
	  case	OS_FRAME_TYPE_MARKER:
		dat->dat_sz = 8;
		dat->reserved1 = 0;
		dat->entry_cnt = 1;
		dat->reserved3 = 0;
		dat->dat_list[0].blk_sz   = htonl(blk_sz);
		dat->dat_list[0].blk_cnt  = htons(blk_cnt);
		dat->dat_list[0].flags    = frame_type==OS_FRAME_TYPE_MARKER?
							OS_DAT_FLAGS_MARK:OS_DAT_FLAGS_DATA;
		dat->dat_list[0].reserved = 0;
	  case	OS_FRAME_TYPE_EOD:
		aux->update_frame_cntr    = htonl(0);
		par->partition_num        = OS_DATA_PARTITION;
		par->par_desc_ver         = OS_PARTITION_VERSION;
		par->wrt_pass_cntr        = htons(STp->wrt_pass_cntr);
		par->first_frame_ppos     = htonl(STp->first_data_ppos);
		par->last_frame_ppos      = htonl(STp->capacity);
		aux->frame_seq_num        = htonl(frame_seq_number);
		aux->logical_blk_num_high = htonl(0);
		aux->logical_blk_num      = htonl(logical_blk_num);
		break;
	  default: ; /* probably FILL */
	}
	aux->filemark_cnt = ntohl(STp->filemark_cnt);
	aux->phys_fm = ntohl(0xffffffff);
	aux->last_mark_ppos = ntohl(STp->last_mark_ppos);
	aux->last_mark_lbn  = ntohl(STp->last_mark_lbn);
}

/*
 * Verify that we have the correct tape frame
 */
static int osst_verify_frame(struct osst_tape * STp, int frame_seq_number, int quiet)
{
	char               * name = tape_name(STp);
	os_aux_t           * aux  = STp->buffer->aux;
	os_partition_t     * par  = &(aux->partition);
	struct st_partstat * STps = &(STp->ps[STp->partition]);
	int		     blk_cnt, blk_sz, i;

	if (STp->raw) {
		if (STp->buffer->syscall_result) {
			for (i=0; i < STp->buffer->sg_segs; i++)
				memset(page_address(STp->buffer->sg[i].page),
				       0, STp->buffer->sg[i].length);
			strcpy(STp->buffer->b_data, "READ ERROR ON FRAME");
                } else
			STp->buffer->buffer_bytes = OS_FRAME_SIZE;
		return 1;
	}
	if (STp->buffer->syscall_result) {
#if DEBUG
		printk(OSST_DEB_MSG "%s:D: Skipping frame, read error\n", name);
#endif
		return 0;
	}
	if (ntohl(aux->format_id) != 0) {
#if DEBUG
		printk(OSST_DEB_MSG "%s:D: Skipping frame, format_id %u\n", name, ntohl(aux->format_id));
#endif
		goto err_out;
	}
	if (memcmp(aux->application_sig, STp->application_sig, 4) != 0 &&
	    (memcmp(aux->application_sig, "LIN3", 4) != 0 || STp->linux_media_version != 4)) {
#if DEBUG
		printk(OSST_DEB_MSG "%s:D: Skipping frame, incorrect application signature\n", name);
#endif
		goto err_out;
	}
	if (par->partition_num != OS_DATA_PARTITION) {
		if (!STp->linux_media || STp->linux_media_version != 2) {
#if DEBUG
			printk(OSST_DEB_MSG "%s:D: Skipping frame, partition num %d\n",
					    name, par->partition_num);
#endif
			goto err_out;
		}
	}
	if (par->par_desc_ver != OS_PARTITION_VERSION) {
#if DEBUG
		printk(OSST_DEB_MSG "%s:D: Skipping frame, partition version %d\n", name, par->par_desc_ver);
#endif
		goto err_out;
	}
	if (ntohs(par->wrt_pass_cntr) != STp->wrt_pass_cntr) {
#if DEBUG
		printk(OSST_DEB_MSG "%s:D: Skipping frame, wrt_pass_cntr %d (expected %d)\n", 
				    name, ntohs(par->wrt_pass_cntr), STp->wrt_pass_cntr);
#endif
		goto err_out;
	}
	if (aux->frame_type != OS_FRAME_TYPE_DATA &&
	    aux->frame_type != OS_FRAME_TYPE_EOD &&
	    aux->frame_type != OS_FRAME_TYPE_MARKER) {
		if (!quiet)
#if DEBUG
			printk(OSST_DEB_MSG "%s:D: Skipping frame, frame type %x\n", name, aux->frame_type);
#endif
		goto err_out;
	}
	if (aux->frame_type == OS_FRAME_TYPE_EOD &&
	    STp->first_frame_position < STp->eod_frame_ppos) {
		printk(KERN_INFO "%s:I: Skipping premature EOD frame %d\n", name,
				 STp->first_frame_position);
		goto err_out;
	}
        if (frame_seq_number != -1 && ntohl(aux->frame_seq_num) != frame_seq_number) {
		if (!quiet)
#if DEBUG
			printk(OSST_DEB_MSG "%s:D: Skipping frame, sequence number %u (expected %d)\n", 
					    name, ntohl(aux->frame_seq_num), frame_seq_number);
#endif
		goto err_out;
	}
	if (aux->frame_type == OS_FRAME_TYPE_MARKER) {
		STps->eof = ST_FM_HIT;

		i = ntohl(aux->filemark_cnt);
		if (STp->header_cache != NULL && i < OS_FM_TAB_MAX && (i > STp->filemark_cnt ||
		    STp->first_frame_position - 1 != ntohl(STp->header_cache->dat_fm_tab.fm_tab_ent[i]))) {
#if DEBUG
			printk(OSST_DEB_MSG "%s:D: %s filemark %d at frame pos %d\n", name,
				  STp->header_cache->dat_fm_tab.fm_tab_ent[i] == 0?"Learned":"Corrected",
				  i, STp->first_frame_position - 1);
#endif
			STp->header_cache->dat_fm_tab.fm_tab_ent[i] = htonl(STp->first_frame_position - 1);
			if (i >= STp->filemark_cnt)
				 STp->filemark_cnt = i+1;
		}
	}
	if (aux->frame_type == OS_FRAME_TYPE_EOD) {
		STps->eof = ST_EOD_1;
		STp->frame_in_buffer = 1;
	}
	if (aux->frame_type == OS_FRAME_TYPE_DATA) {
                blk_cnt = ntohs(aux->dat.dat_list[0].blk_cnt);
		blk_sz  = ntohl(aux->dat.dat_list[0].blk_sz);
		STp->buffer->buffer_bytes = blk_cnt * blk_sz;
		STp->buffer->read_pointer = 0;
		STp->frame_in_buffer = 1;

		/* See what block size was used to write file */
		if (STp->block_size != blk_sz && blk_sz > 0) {
			printk(KERN_INFO
	    	"%s:I: File was written with block size %d%c, currently %d%c, adjusted to match.\n",
       				name, blk_sz<1024?blk_sz:blk_sz/1024,blk_sz<1024?'b':'k',
				STp->block_size<1024?STp->block_size:STp->block_size/1024,
				STp->block_size<1024?'b':'k');
			STp->block_size            = blk_sz;
			STp->buffer->buffer_blocks = OS_DATA_SIZE / blk_sz;
		}
		STps->eof = ST_NOEOF;
	}
        STp->frame_seq_number = ntohl(aux->frame_seq_num);
	STp->logical_blk_num  = ntohl(aux->logical_blk_num);
	return 1;

err_out:
	if (STp->read_error_frame == 0)
		STp->read_error_frame = STp->first_frame_position - 1;
	return 0;
}

/*
 * Wait for the unit to become Ready
 */
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static int osst_wait_ready(struct osst_tape * STp, struct osst_request ** aSRpnt,
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				 unsigned timeout, int initial_delay)
{
	unsigned char		cmd[MAX_COMMAND_SIZE];
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	struct osst_request   * SRpnt;
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	unsigned long		startwait = jiffies;
#if DEBUG
	int			dbg  = debugging;
	char    	      * name = tape_name(STp);

	printk(OSST_DEB_MSG "%s:D: Reached onstream wait ready\n", name);
#endif

	if (initial_delay > 0)
		msleep(jiffies_to_msecs(initial_delay));

	memset(cmd, 0, MAX_COMMAND_SIZE);
	cmd[0] = TEST_UNIT_READY;

	SRpnt = osst_do_scsi(*aSRpnt, STp, cmd, 0, DMA_NONE, STp->timeout, MAX_RETRIES, 1);
	*aSRpnt = SRpnt;
	if (!SRpnt) return (-EBUSY);

	while ( STp->buffer->syscall_result && time_before(jiffies, startwait + timeout*HZ) &&
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	       (( 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                                        )  )) {
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#if DEBUG
	    if (debugging) {
		printk(OSST_DEB_MSG "%s:D: Sleeping in onstream wait ready\n", name);
		printk(OSST_DEB_MSG "%s:D: Turning off debugging for a while\n", name);
		debugging = 0;
	    }
#endif
	    msleep(100);

	    memset(cmd, 0, MAX_COMMAND_SIZE);
	    cmd[0] = TEST_UNIT_READY;

	    SRpnt = osst_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE, STp->timeout, MAX_RETRIES, 1);
	}
	*aSRpnt = SRpnt;
#if DEBUG
	debugging = dbg;
#endif
	if ( STp->buffer->syscall_result &&
	     osst_write_error_recovery(STp, aSRpnt, 0) ) {
#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,
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			STp->buffer->syscall_result, SRpnt->sense[0], SRpnt->sense[2],
			SRpnt->sense[12], SRpnt->sense[13]);
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#endif
	    return (-EIO);
	}
#if DEBUG
	printk(OSST_DEB_MSG "%s:D: Normal exit from onstream wait ready\n", name);
#endif
	return 0;
}

/*
 * Wait for a tape to be inserted in the unit
 */
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static int osst_wait_for_medium(struct osst_tape * STp, struct osst_request ** aSRpnt, unsigned timeout)
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{
	unsigned char		cmd[MAX_COMMAND_SIZE];
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	struct osst_request   * SRpnt;
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	unsigned long		startwait = jiffies;
#if DEBUG
	int			dbg = debugging;
	char    	      * name = tape_name(STp);

	printk(OSST_DEB_MSG "%s:D: Reached onstream wait for medium\n", name);
#endif

	memset(cmd, 0, MAX_COMMAND_SIZE);
	cmd[0] = TEST_UNIT_READY;

	SRpnt = osst_do_scsi(*aSRpnt, STp, cmd, 0, DMA_NONE, STp->timeout, MAX_RETRIES, 1);
	*aSRpnt = SRpnt;
	if (!SRpnt) return (-EBUSY);

	while ( STp->buffer->syscall_result && time_before(jiffies, startwait + timeout*HZ) &&
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		SRpnt->sense[2] == 2 && SRpnt->sense[12] == 0x3a && SRpnt->sense[13] == 0  ) {
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#if DEBUG
	    if (debugging) {
		printk(OSST_DEB_MSG "%s:D: Sleeping in onstream wait medium\n", name);
		printk(OSST_DEB_MSG "%s:D: Turning off debugging for a while\n", name);
		debugging = 0;
	    }
#endif
	    msleep(100);

	    memset(cmd, 0, MAX_COMMAND_SIZE);
	    cmd[0] = TEST_UNIT_READY;

	    SRpnt = osst_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE, STp->timeout, MAX_RETRIES, 1);
	}
	*aSRpnt = SRpnt;
#if DEBUG
	debugging = dbg;
#endif
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	if ( STp->buffer->syscall_result     && SRpnt->sense[2]  != 2 &&
	     SRpnt->sense[12] != 4 && SRpnt->sense[13] == 1) {
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#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,
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			STp->buffer->syscall_result, SRpnt->sense[0], SRpnt->sense[2],
			SRpnt->sense[12], SRpnt->sense[13]);
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#endif
	    return 0;
	}
#if DEBUG
	printk(OSST_DEB_MSG "%s:D: Normal exit from onstream wait medium\n", name);
#endif
	return 1;
}

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static int osst_position_tape_and_confirm(struct osst_tape * STp, struct osst_request ** aSRpnt, int frame)
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{
	int	retval;

	osst_wait_ready(STp, aSRpnt, 15 * 60, 0);			/* TODO - can this catch a write error? */
	retval = osst_set_frame_position(STp, aSRpnt, frame, 0);
	if (retval) return (retval);
	osst_wait_ready(STp, aSRpnt, 15 * 60, OSST_WAIT_POSITION_COMPLETE);
	return (osst_get_frame_position(STp, aSRpnt));
}

/*
 * Wait for write(s) to complete
 */
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static int osst_flush_drive_buffer(struct osst_tape * STp, struct osst_request ** aSRpnt)
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{
	unsigned char		cmd[MAX_COMMAND_SIZE];
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	struct osst_request   * SRpnt;
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	int			result = 0;
	int			delay  = OSST_WAIT_WRITE_COMPLETE;
#if DEBUG
	char		      * name = tape_name(STp);

	printk(OSST_DEB_MSG "%s:D: Reached onstream flush drive buffer (write filemark)\n", name);
#endif

	memset(cmd, 0, MAX_COMMAND_SIZE);
	cmd[0] = WRITE_FILEMARKS;
	cmd[1] = 1;

	SRpnt = osst_do_scsi(*aSRpnt, STp, cmd, 0, DMA_NONE, STp->timeout, MAX_RETRIES, 1);
	*aSRpnt = SRpnt;
	if (!SRpnt) return (-EBUSY);
	if (STp->buffer->syscall_result) {
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		if ((SRpnt->sense[2] & 0x0f) == 2 && SRpnt->sense[12] == 4) {
			if (SRpnt->sense[13] == 8) {
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				delay = OSST_WAIT_LONG_WRITE_COMPLETE;
			}
		} else
			result = osst_write_error_recovery(STp, aSRpnt, 0);
	}
	result |= osst_wait_ready(STp, aSRpnt, 5 * 60, delay);
	STp->ps[STp->partition].rw = OS_WRITING_COMPLETE;

	return (result);
}

#define OSST_POLL_PER_SEC 10
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static int osst_wait_frame(struct osst_tape * STp, struct osst_request ** aSRpnt, int curr, int minlast, int to)
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{
	unsigned long	startwait = jiffies;
	char	      * name      = tape_name(STp);
#if DEBUG
	char	   notyetprinted  = 1;
#endif
	if (minlast >= 0 && STp->ps[STp->partition].rw != ST_READING)
		printk(KERN_ERR "%s:A: Waiting for frame without having initialized read!\n", name);

	while (time_before (jiffies, startwait + to*HZ))
	{ 
		int result;
		result = osst_get_frame_position(STp, aSRpnt);
		if (result == -EIO)
			if ((result = osst_write_error_recovery(STp, aSRpnt, 0)) == 0)
				return 0;	/* successful recovery leaves drive ready for frame */
		if (result < 0) break;
		if (STp->first_frame_position == curr &&
		    ((minlast < 0 &&
		      (signed)STp->last_frame_position > (signed)curr + minlast) ||
		     (minlast >= 0 && STp->cur_frames > minlast)
		    ) && result >= 0)
		{
#if DEBUG			
860
			if (debugging || time_after_eq(jiffies, startwait + 2*HZ/OSST_POLL_PER_SEC))
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				printk (OSST_DEB_MSG
					"%s:D: Succ wait f fr %i (>%i): %i-%i %i (%i): %3li.%li s\n",
					name, curr, curr+minlast, STp->first_frame_position,
					STp->last_frame_position, STp->cur_frames,
					result, (jiffies-startwait)/HZ, 
					(((jiffies-startwait)%HZ)*10)/HZ);
#endif
			return 0;
		}
#if DEBUG
871
		if (time_after_eq(jiffies, startwait + 2*HZ/OSST_POLL_PER_SEC) && notyetprinted)
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		{
			printk (OSST_DEB_MSG "%s:D: Wait for frame %i (>%i): %i-%i %i (%i)\n",
				name, curr, curr+minlast, STp->first_frame_position,
				STp->last_frame_position, STp->cur_frames, result);
			notyetprinted--;
		}
#endif
		msleep(1000 / OSST_POLL_PER_SEC);
	}
#if DEBUG
	printk (OSST_DEB_MSG "%s:D: Fail wait f fr %i (>%i): %i-%i %i: %3li.%li s\n",
		name, curr, curr+minlast, STp->first_frame_position,
		STp->last_frame_position, STp->cur_frames,
		(jiffies-startwait)/HZ, (((jiffies-startwait)%HZ)*10)/HZ);
#endif	
	return -EBUSY;
}

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static int osst_recover_wait_frame(struct osst_tape * STp, struct osst_request ** aSRpnt, int writing)
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{
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	struct osst_request   * SRpnt;
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	unsigned char		cmd[MAX_COMMAND_SIZE];
	unsigned long   	startwait = jiffies;
	int			retval    = 1;
        char		      * name      = tape_name(STp);
                                                                                                                                
	if (writing) {
		char	mybuf[24];
		char  * olddata = STp->buffer->b_data;
		int	oldsize = STp->buffer->buffer_size;

		/* write zero fm then read pos - if shows write error, try to recover - if no progress, wait */

		memset(cmd, 0, MAX_COMMAND_SIZE);
		cmd[0] = WRITE_FILEMARKS;
		cmd[1] = 1;
		SRpnt = osst_do_scsi(*aSRpnt, STp, cmd, 0, DMA_NONE, STp->timeout,
								MAX_RETRIES, 1);

		while (retval && time_before (jiffies, startwait + 5*60*HZ)) {

913
			if (STp->buffer->syscall_result && (SRpnt->sense[2] & 0x0f) != 2) {
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				/* some failure - not just not-ready */
				retval = osst_write_error_recovery(STp, aSRpnt, 0);
				break;
			}
919
			schedule_timeout_interruptible(HZ / OSST_POLL_PER_SEC);
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			STp->buffer->b_data = mybuf; STp->buffer->buffer_size = 24;
			memset(cmd, 0, MAX_COMMAND_SIZE);
			cmd[0] = READ_POSITION;

			SRpnt = osst_do_scsi(SRpnt, STp, cmd, 20, DMA_FROM_DEVICE, STp->timeout,
										MAX_RETRIES, 1);

			retval = ( STp->buffer->syscall_result || (STp->buffer)->b_data[15] > 25 );
			STp->buffer->b_data = olddata; STp->buffer->buffer_size = oldsize;
		}
		if (retval)
			printk(KERN_ERR "%s:E: Device did not succeed to write buffered data\n", name);
	} else
		/* TODO - figure out which error conditions can be handled */
		if (STp->buffer->syscall_result)
			printk(KERN_WARNING
				"%s:W: Recover_wait_frame(read) cannot handle %02x:%02x:%02x\n", name,
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					(*aSRpnt)->sense[ 2] & 0x0f,
					(*aSRpnt)->sense[12],
					(*aSRpnt)->sense[13]);
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	return retval;
}

/*
 * Read the next OnStream tape frame at the current location
 */
948
static int osst_read_frame(struct osst_tape * STp, struct osst_request ** aSRpnt, int timeout)
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{
	unsigned char		cmd[MAX_COMMAND_SIZE];
951
	struct osst_request   * SRpnt;
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	int			retval = 0;
#if DEBUG
	os_aux_t	      * aux    = STp->buffer->aux;
	char		      * name   = tape_name(STp);
#endif

	if (STp->poll)
		if (osst_wait_frame (STp, aSRpnt, STp->first_frame_position, 0, timeout))
			retval = osst_recover_wait_frame(STp, aSRpnt, 0);

	memset(cmd, 0, MAX_COMMAND_SIZE);
	cmd[0] = READ_6;
	cmd[1] = 1;
	cmd[4] = 1;

#if DEBUG
	if (debugging)
		printk(OSST_DEB_MSG "%s:D: Reading frame from OnStream tape\n", name);
#endif
	SRpnt = osst_do_scsi(*aSRpnt, STp, cmd, OS_FRAME_SIZE, DMA_FROM_DEVICE,
				      STp->timeout, MAX_RETRIES, 1);
	*aSRpnt = SRpnt;
	if (!SRpnt)
		return (-EBUSY);

	if ((STp->buffer)->syscall_result) {
	    retval = 1;
	    if (STp->read_error_frame == 0) {
		STp->read_error_frame = STp->first_frame_position;
#if DEBUG
		printk(OSST_DEB_MSG "%s:D: Recording read error at %d\n", name, STp->read_error_frame);
#endif
	    }
#if DEBUG
	    if (debugging)
		printk(OSST_DEB_MSG "%s:D: Sense: %2x %2x %2x %2x %2x %2x %2x %2x\n",
		   name,
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		   SRpnt->sense[0], SRpnt->sense[1],
		   SRpnt->sense[2], SRpnt->sense[3],
		   SRpnt->sense[4], SRpnt->sense[5],
		   SRpnt->sense[6], SRpnt->sense[7]);
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#endif
	}
	else
	    STp->first_frame_position++;
#if DEBUG
	if (debugging) {
	   char sig[8]; int i;
	   for (i=0;i<4;i++)
		   sig[i] = aux->application_sig[i]<32?'^':aux->application_sig[i];
	   sig[4] = '\0';
	   printk(OSST_DEB_MSG 
		"%s:D: AUX: %s UpdFrCt#%d Wpass#%d %s FrSeq#%d LogBlk#%d Qty=%d Sz=%d\n", name, sig,
			ntohl(aux->update_frame_cntr), ntohs(aux->partition.wrt_pass_cntr),
			aux->frame_type==1?"EOD":aux->frame_type==2?"MARK":
			aux->frame_type==8?"HEADR":aux->frame_type==0x80?"DATA":"FILL", 
			ntohl(aux->frame_seq_num), ntohl(aux->logical_blk_num),
			ntohs(aux->dat.dat_list[0].blk_cnt), ntohl(aux->dat.dat_list[0].blk_sz) );
	   if (aux->frame_type==2)
		printk(OSST_DEB_MSG "%s:D: mark_cnt=%d, last_mark_ppos=%d, last_mark_lbn=%d\n", name,
			ntohl(aux->filemark_cnt), ntohl(aux->last_mark_ppos), ntohl(aux->last_mark_lbn));
	   printk(OSST_DEB_MSG "%s:D: Exit read frame from OnStream tape with code %d\n", name, retval);
	}
#endif
	return (retval);
}

1019
static int osst_initiate_read(struct osst_tape * STp, struct osst_request ** aSRpnt)
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{
	struct st_partstat    * STps   = &(STp->ps[STp->partition]);
1022
	struct osst_request   * SRpnt  ;
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	unsigned char		cmd[MAX_COMMAND_SIZE];
	int			retval = 0;
	char		      * name   = tape_name(STp);

	if (STps->rw != ST_READING) {         /* Initialize read operation */
		if (STps->rw == ST_WRITING || STp->dirty) {
			STp->write_type = OS_WRITE_DATA;
                        osst_flush_write_buffer(STp, aSRpnt);
			osst_flush_drive_buffer(STp, aSRpnt);
		}
		STps->rw = ST_READING;
		STp->frame_in_buffer = 0;

		/*
		 *      Issue a read 0 command to get the OnStream drive
                 *      read frames into its buffer.
		 */
		memset(cmd, 0, MAX_COMMAND_SIZE);
		cmd[0] = READ_6;
		cmd[1] = 1;

#if DEBUG
		printk(OSST_DEB_MSG "%s:D: Start Read Ahead on OnStream tape\n", name);
#endif
		SRpnt   = osst_do_scsi(*aSRpnt, STp, cmd, 0, DMA_NONE, STp->timeout, MAX_RETRIES, 1);
		*aSRpnt = SRpnt;
		if ((retval = STp->buffer->syscall_result))
			printk(KERN_WARNING "%s:W: Error starting read ahead\n", name);
	}

	return retval;
}

1056
static int osst_get_logical_frame(struct osst_tape * STp, struct osst_request ** aSRpnt,
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						int frame_seq_number, int quiet)
{
	struct st_partstat * STps  = &(STp->ps[STp->partition]);
	char		   * name  = tape_name(STp);
	int		     cnt   = 0,
			     bad   = 0,
			     past  = 0,
			     x,
			     position;

	/*
	 * If we want just any frame (-1) and there is a frame in the buffer, return it
	 */
	if (frame_seq_number == -1 && STp->frame_in_buffer) {
#if DEBUG
		printk(OSST_DEB_MSG "%s:D: Frame %d still in buffer\n", name, STp->frame_seq_number);
#endif
		return (STps->eof);
	}
	/*
         * Search and wait for the next logical tape frame
	 */
	while (1) {
		if (cnt++ > 400) {
                        printk(KERN_ERR "%s:E: Couldn't find logical frame %d, aborting\n",
					    name, frame_seq_number);
			if (STp->read_error_frame) {
				osst_set_frame_position(STp, aSRpnt, STp->read_error_frame, 0);
#if DEBUG
                        	printk(OSST_DEB_MSG "%s:D: Repositioning tape to bad frame %d\n",
						    name, STp->read_error_frame);
#endif
				STp->read_error_frame = 0;
				STp->abort_count++;
			}
			return (-EIO);
		}
#if DEBUG
		if (debugging)
			printk(OSST_DEB_MSG "%s:D: Looking for frame %d, attempt %d\n",
					  name, frame_seq_number, cnt);
#endif
		if ( osst_initiate_read(STp, aSRpnt)
                || ( (!STp->frame_in_buffer) && osst_read_frame(STp, aSRpnt, 30) ) ) {
			if (STp->raw)
				return (-EIO);
			position = osst_get_frame_position(STp, aSRpnt);
			if (position >= 0xbae && position < 0xbb8)
				position = 0xbb8;
			else if (position > STp->eod_frame_ppos || ++bad == 10) {
				position = STp->read_error_frame - 1;
				bad = 0;
			}
			else {
				position += 29;
				cnt      += 19;
			}
#if DEBUG
			printk(OSST_DEB_MSG "%s:D: Bad frame detected, positioning tape to block %d\n",
					 name, position);
#endif
			osst_set_frame_position(STp, aSRpnt, position, 0);
			continue;
		}
		if (osst_verify_frame(STp, frame_seq_number, quiet))
			break;
		if (osst_verify_frame(STp, -1, quiet)) {
			x = ntohl(STp->buffer->aux->frame_seq_num);
			if (STp->fast_open) {
				printk(KERN_WARNING
				       "%s:W: Found logical frame %d instead of %d after fast open\n",
				       name, x, frame_seq_number);
				STp->header_ok = 0;
				STp->read_error_frame = 0;
				return (-EIO);
			}
			if (x > frame_seq_number) {
				if (++past > 3) {
					/* positioning backwards did not bring us to the desired frame */
					position = STp->read_error_frame - 1;
				}
				else {
			        	position = osst_get_frame_position(STp, aSRpnt)
					         + frame_seq_number - x - 1;

					if (STp->first_frame_position >= 3000 && position < 3000)
						position -= 10;
				}
#if DEBUG
                                printk(OSST_DEB_MSG
				       "%s:D: Found logical frame %d while looking for %d: back up %d\n",
						name, x, frame_seq_number,
					       	STp->first_frame_position - position);
#endif
                        	osst_set_frame_position(STp, aSRpnt, position, 0);
				cnt += 10;
			}
			else
				past = 0;
		}
		if (osst_get_frame_position(STp, aSRpnt) == 0xbaf) {
#if DEBUG
			printk(OSST_DEB_MSG "%s:D: Skipping config partition\n", name);
#endif
			osst_set_frame_position(STp, aSRpnt, 0xbb8, 0);
			cnt--;
		}
		STp->frame_in_buffer = 0;
	}
	if (cnt > 1) {
		STp->recover_count++;
		STp->recover_erreg++;
		printk(KERN_WARNING "%s:I: Don't worry, Read error at position %d recovered\n", 
					name, STp->read_error_frame);
 	}
	STp->read_count++;

#if DEBUG
	if (debugging || STps->eof)
		printk(OSST_DEB_MSG
			"%s:D: Exit get logical frame (%d=>%d) from OnStream tape with code %d\n",
			name, frame_seq_number, STp->frame_seq_number, STps->eof);
#endif
	STp->fast_open = 0;
	STp->read_error_frame = 0;
	return (STps->eof);
}

1185
static int osst_seek_logical_blk(struct osst_tape * STp, struct osst_request ** aSRpnt, int logical_blk_num)
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{
        struct st_partstat * STps = &(STp->ps[STp->partition]);
	char		   * name = tape_name(STp);
	int	retries    = 0;
	int	frame_seq_estimate, ppos_estimate, move;
	
	if (logical_blk_num < 0) logical_blk_num = 0;
#if DEBUG
	printk(OSST_DEB_MSG "%s:D: Seeking logical block %d (now at %d, size %d%c)\n",
				name, logical_blk_num, STp->logical_blk_num, 
				STp->block_size<1024?STp->block_size:STp->block_size/1024,
				STp->block_size<1024?'b':'k');
#endif
	/* Do we know where we are? */
	if (STps->drv_block >= 0) {
		move                = logical_blk_num - STp->logical_blk_num;
		if (move < 0) move -= (OS_DATA_SIZE / STp->block_size) - 1;
		move               /= (OS_DATA_SIZE / STp->block_size);
		frame_seq_estimate  = STp->frame_seq_number + move;
	} else
		frame_seq_estimate  = logical_blk_num * STp->block_size / OS_DATA_SIZE;

	if (frame_seq_estimate < 2980) ppos_estimate = frame_seq_estimate + 10;
	else			       ppos_estimate = frame_seq_estimate + 20;
	while (++retries < 10) {
	   if (ppos_estimate > STp->eod_frame_ppos-2) {
	       frame_seq_estimate += STp->eod_frame_ppos - 2 - ppos_estimate;
	       ppos_estimate       = STp->eod_frame_ppos - 2;
	   }
	   if (frame_seq_estimate < 0) {
	       frame_seq_estimate = 0;
	       ppos_estimate      = 10;
	   }
	   osst_set_frame_position(STp, aSRpnt, ppos_estimate, 0);
	   if (osst_get_logical_frame(STp, aSRpnt, frame_seq_estimate, 1) >= 0) {
	      /* we've located the estimated frame, now does it have our block? */
	      if (logical_blk_num <  STp->logical_blk_num ||
	          logical_blk_num >= STp->logical_blk_num + ntohs(STp->buffer->aux->dat.dat_list[0].blk_cnt)) {
		 if (STps->eof == ST_FM_HIT)
		    move = logical_blk_num < STp->logical_blk_num? -2 : 1;
		 else {
		    move                = logical_blk_num - STp->logical_blk_num;
		    if (move < 0) move -= (OS_DATA_SIZE / STp->block_size) - 1;
		    move               /= (OS_DATA_SIZE / STp->block_size);
		 }
		 if (!move) move = logical_blk_num > STp->logical_blk_num ? 1 : -1;
#if DEBUG
		 printk(OSST_DEB_MSG
			"%s:D: Seek retry %d at ppos %d fsq %d (est %d) lbn %d (need %d) move %d\n",
				name, retries, ppos_estimate, STp->frame_seq_number, frame_seq_estimate, 
				STp->logical_blk_num, logical_blk_num, move);
#endif
		 frame_seq_estimate += move;
		 ppos_estimate      += move;
		 continue;
	      } else {
		 STp->buffer->read_pointer  = (logical_blk_num - STp->logical_blk_num) * STp->block_size;
		 STp->buffer->buffer_bytes -= STp->buffer->read_pointer;
		 STp->logical_blk_num       =  logical_blk_num;
#if DEBUG
		 printk(OSST_DEB_MSG 
			"%s:D: Seek success at ppos %d fsq %d in_buf %d, bytes %d, ptr %d*%d\n",
				name, ppos_estimate, STp->frame_seq_number, STp->frame_in_buffer, 
				STp->buffer->buffer_bytes, STp->buffer->read_pointer / STp->block_size, 
				STp->block_size);
#endif
		 STps->drv_file = ntohl(STp->buffer->aux->filemark_cnt);
		 if (STps->eof == ST_FM_HIT) {
		     STps->drv_file++;
		     STps->drv_block = 0;
		 } else {
		     STps->drv_block = ntohl(STp->buffer->aux->last_mark_lbn)?
					  STp->logical_blk_num -
					     (STps->drv_file ? ntohl(STp->buffer->aux->last_mark_lbn) + 1 : 0):
					-1;
		 }
		 STps->eof = (STp->first_frame_position >= STp->eod_frame_ppos)?ST_EOD:ST_NOEOF;
		 return 0;
	      }
	   }
	   if (osst_get_logical_frame(STp, aSRpnt, -1, 1) < 0)
	      goto error;
	   /* we are not yet at the estimated frame, adjust our estimate of its physical position */
#if DEBUG
	   printk(OSST_DEB_MSG "%s:D: Seek retry %d at ppos %d fsq %d (est %d) lbn %d (need %d)\n", 
			   name, retries, ppos_estimate, STp->frame_seq_number, frame_seq_estimate, 
			   STp->logical_blk_num, logical_blk_num);
#endif
	   if (frame_seq_estimate != STp->frame_seq_number)
	      ppos_estimate += frame_seq_estimate - STp->frame_seq_number;
	   else
	      break;
	}
error:
	printk(KERN_ERR "%s:E: Couldn't seek to logical block %d (at %d), %d retries\n", 
			    name, logical_blk_num, STp->logical_blk_num, retries);
	return (-EIO);
}

/* The values below are based on the OnStream frame payload size of 32K == 2**15,
 * that is, OSST_FRAME_SHIFT + OSST_SECTOR_SHIFT must be 15. With a minimum block
 * size of 512 bytes, we need to be able to resolve 32K/512 == 64 == 2**6 positions
 * inside each frame. Finaly, OSST_SECTOR_MASK == 2**OSST_FRAME_SHIFT - 1.
 */
#define OSST_FRAME_SHIFT  6
#define OSST_SECTOR_SHIFT 9
#define OSST_SECTOR_MASK  0x03F

1294
static int osst_get_sector(struct osst_tape * STp, struct osst_request ** aSRpnt)
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{
	int	sector;
#if DEBUG
	char  * name = tape_name(STp);
	
	printk(OSST_DEB_MSG 
		"%s:D: Positioned at ppos %d, frame %d, lbn %d, file %d, blk %d, %cptr %d, eof %d\n",
		name, STp->first_frame_position, STp->frame_seq_number, STp->logical_blk_num,
		STp->ps[STp->partition].drv_file, STp->ps[STp->partition].drv_block, 
		STp->ps[STp->partition].rw == ST_WRITING?'w':'r',
		STp->ps[STp->partition].rw == ST_WRITING?STp->buffer->buffer_bytes:
		STp->buffer->read_pointer, STp->ps[STp->partition].eof);
#endif
	/* do we know where we are inside a file? */
	if (STp->ps[STp->partition].drv_block >= 0) {
		sector = (STp->frame_in_buffer ? STp->first_frame_position-1 :
				STp->first_frame_position) << OSST_FRAME_SHIFT;
		if (STp->ps[STp->partition].rw == ST_WRITING)
		       	sector |= (STp->buffer->buffer_bytes >> OSST_SECTOR_SHIFT) & OSST_SECTOR_MASK;
		else
	       		sector |= (STp->buffer->read_pointer >> OSST_SECTOR_SHIFT) & OSST_SECTOR_MASK;
	} else {
		sector = osst_get_frame_position(STp, aSRpnt);
		if (sector > 0)
			sector <<= OSST_FRAME_SHIFT;
	}
	return sector;
}

1324
static int osst_seek_sector(struct osst_tape * STp, struct osst_request ** aSRpnt, int sector)
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{
        struct st_partstat * STps   = &(STp->ps[STp->partition]);
	int		     frame  = sector >> OSST_FRAME_SHIFT,
			     offset = (sector & OSST_SECTOR_MASK) << OSST_SECTOR_SHIFT, 
			     r;
#if DEBUG
	char          * name = tape_name(STp);

	printk(OSST_DEB_MSG "%s:D: Seeking sector %d in frame %d at offset %d\n",
				name, sector, frame, offset);
#endif
	if (frame < 0 || frame >= STp->capacity) return (-ENXIO);

	if (frame <= STp->first_data_ppos) {
		STp->frame_seq_number = STp->logical_blk_num = STps->drv_file = STps->drv_block = 0;
		return (osst_set_frame_position(STp, aSRpnt, frame, 0));
	}
	r = osst_set_frame_position(STp, aSRpnt, offset?frame:frame-1, 0);
	if (r < 0) return r;

	r = osst_get_logical_frame(STp, aSRpnt, -1, 1);
	if (r < 0) return r;

	if (osst_get_frame_position(STp, aSRpnt) != (offset?frame+1:frame)) return (-EIO);

	if (offset) {
		STp->logical_blk_num      += offset / STp->block_size;
		STp->buffer->read_pointer  = offset;
		STp->buffer->buffer_bytes -= offset;
	} else {
		STp->frame_seq_number++;
		STp->frame_in_buffer       = 0;
		STp->logical_blk_num      += ntohs(STp->buffer->aux->dat.dat_list[0].blk_cnt);
		STp->buffer->buffer_bytes  = STp->buffer->read_pointer = 0;
	}
	STps->drv_file = ntohl(STp->buffer->aux->filemark_cnt);
	if (STps->eof == ST_FM_HIT) {
		STps->drv_file++;
		STps->drv_block = 0;
	} else {
		STps->drv_block = ntohl(STp->buffer->aux->last_mark_lbn)?
				    STp->logical_blk_num -
					(STps->drv_file ? ntohl(STp->buffer->aux->last_mark_lbn) + 1 : 0):
				  -1;
	}
	STps->eof       = (STp->first_frame_position >= STp->eod_frame_ppos)?ST_EOD:ST_NOEOF;
#if DEBUG
	printk(OSST_DEB_MSG 
		"%s:D: Now positioned at ppos %d, frame %d, lbn %d, file %d, blk %d, rptr %d, eof %d\n",
		name, STp->first_frame_position, STp->frame_seq_number, STp->logical_blk_num,
		STps->drv_file, STps->drv_block, STp->buffer->read_pointer, STps->eof);
#endif
	return 0;
}

/*
 * Read back the drive's internal buffer contents, as a part
 * of the write error recovery mechanism for old OnStream
 * firmware revisions.
 * Precondition for this function to work: all frames in the
 * drive's buffer must be of one type (DATA, MARK or EOD)!
 */
1387
static int osst_read_back_buffer_and_rewrite(struct osst_tape * STp, struct osst_request ** aSRpnt,
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						unsigned int frame, unsigned int skip, int pending)
{
1390
	struct osst_request   * SRpnt = * aSRpnt;
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	unsigned char	      * buffer, * p;
	unsigned char		cmd[MAX_COMMAND_SIZE];
	int			flag, new_frame, i;
	int			nframes          = STp->cur_frames;
	int			blks_per_frame   = ntohs(STp->buffer->aux->dat.dat_list[0].blk_cnt);
	int			frame_seq_number = ntohl(STp->buffer->aux->frame_seq_num)
						- (nframes + pending - 1);
	int			logical_blk_num  = ntohl(STp->buffer->aux->logical_blk_num) 
						- (nframes + pending - 1) * blks_per_frame;
	char		      * name             = tape_name(STp);
	unsigned long		startwait        = jiffies;
#if DEBUG
	int			dbg              = debugging;
#endif

	if ((buffer = (unsigned char *)vmalloc((nframes + 1) * OS_DATA_SIZE)) == NULL)
		return (-EIO);

	printk(KERN_INFO "%s:I: Reading back %d frames from drive buffer%s\n",
			 name, nframes, pending?" and one that was pending":"");

	osst_copy_from_buffer(STp->buffer, (p = &buffer[nframes * OS_DATA_SIZE]));
#if DEBUG
	if (pending && debugging)
		printk(OSST_DEB_MSG "%s:D: Pending frame %d (lblk %d), data %02x %02x %02x %02x\n",
				name, frame_seq_number + nframes,
			       	logical_blk_num + nframes * blks_per_frame,
			       	p[0], p[1], p[2], p[3]);
#endif
	for (i = 0, p = buffer; i < nframes; i++, p += OS_DATA_SIZE) {

		memset(cmd, 0, MAX_COMMAND_SIZE);
		cmd[0] = 0x3C;		/* Buffer Read           */
		cmd[1] = 6;		/* Retrieve Faulty Block */
		cmd[7] = 32768 >> 8;
		cmd[8] = 32768 & 0xff;

		SRpnt = osst_do_scsi(SRpnt, STp, cmd, OS_FRAME_SIZE, DMA_FROM_DEVICE,
					    STp->timeout, MAX_RETRIES, 1);
	
		if ((STp->buffer)->syscall_result || !SRpnt) {
			printk(KERN_ERR "%s:E: Failed to read frame back from OnStream buffer\n", name);
1433
			vfree(buffer);
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			*aSRpnt = SRpnt;
			return (-EIO);
		}
		osst_copy_from_buffer(STp->buffer, p);
#if DEBUG
		if (debugging)
			printk(OSST_DEB_MSG "%s:D: Read back logical frame %d, data %02x %02x %02x %02x\n",
					  name, frame_seq_number + i, p[0], p[1], p[2], p[3]);
#endif
	}
	*aSRpnt = SRpnt;
	osst_get_frame_position(STp, aSRpnt);

#if DEBUG
	printk(OSST_DEB_MSG "%s:D: Frames left in buffer: %d\n", name, STp->cur_frames);
#endif
	/* Write synchronously so we can be sure we're OK again and don't have to recover recursively */
	/* In the header we don't actually re-write the frames that fail, just the ones after them */

	for (flag=1, new_frame=frame, p=buffer, i=0; i < nframes + pending; ) {

		if (flag) {
			if (STp->write_type == OS_WRITE_HEADER) {
				i += skip;
				p += skip * OS_DATA_SIZE;
			}
			else if (new_frame < 2990 && new_frame+skip+nframes+pending >= 2990)
				new_frame = 3000-i;
			else
				new_frame += skip;
#if DEBUG
			printk(OSST_DEB_MSG "%s:D: Position to frame %d, write fseq %d\n",
						name, new_frame+i, frame_seq_number+i);
#endif
			osst_set_frame_position(STp, aSRpnt, new_frame + i, 0);
			osst_wait_ready(STp, aSRpnt, 60, OSST_WAIT_POSITION_COMPLETE);
			osst_get_frame_position(STp, aSRpnt);
			SRpnt = * aSRpnt;

			if (new_frame > frame + 1000) {
				printk(KERN_ERR "%s:E: Failed to find writable tape media\n", name);
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				vfree(buffer);
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				return (-EIO);
			}
			if ( i >= nframes + pending ) break;
			flag = 0;
		}
		osst_copy_to_buffer(STp->buffer, p);
		/*
		 * IMPORTANT: for error recovery to work, _never_ queue frames with mixed frame type!
		 */
		osst_init_aux(STp, STp->buffer->aux->frame_type, frame_seq_number+i,
			       	logical_blk_num + i*blks_per_frame,
			       	ntohl(STp->buffer->aux->dat.dat_list[0].blk_sz), blks_per_frame);
		memset(cmd, 0, MAX_COMMAND_SIZE);
		cmd[0] = WRITE_6;
		cmd[1] = 1;
		cmd[4] = 1;

#if DEBUG
		if (debugging)
			printk(OSST_DEB_MSG
				"%s:D: About to write frame %d, seq %d, lbn %d, data %02x %02x %02x %02x\n",
				name, new_frame+i, frame_seq_number+i, logical_blk_num + i*blks_per_frame,
				p[0], p[1], p[2], p[3]);
#endif
		SRpnt = osst_do_scsi(SRpnt, STp, cmd, OS_FRAME_SIZE, DMA_TO_DEVICE,
					    STp->timeout, MAX_RETRIES, 1);

		if (STp->buffer->syscall_result)
			flag = 1;
		else {
			p += OS_DATA_SIZE; i++;

			/* if we just sent the last frame, wait till all successfully written */
			if ( i == nframes + pending ) {
#if DEBUG
				printk(OSST_DEB_MSG "%s:D: Check re-write successful\n", name);
#endif
				memset(cmd, 0, MAX_COMMAND_SIZE);
				cmd[0] = WRITE_FILEMARKS;
				cmd[1] = 1;
				SRpnt = osst_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE,
							    STp->timeout, MAX_RETRIES, 1);
#if DEBUG
				if (debugging) {
					printk(OSST_DEB_MSG "%s:D: Sleeping in re-write wait ready\n", name);
					printk(OSST_DEB_MSG "%s:D: Turning off debugging for a while\n", name);
					debugging = 0;
				}
#endif
				flag = STp->buffer->syscall_result;
				while ( !flag && time_before(jiffies, startwait + 60*HZ) ) {

					memset(cmd, 0, MAX_COMMAND_SIZE);
					cmd[0] = TEST_UNIT_READY;

					SRpnt = osst_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE, STp->timeout,
												MAX_RETRIES, 1);

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					if (SRpnt->sense[2] == 2 && SRpnt->sense[12] == 4 &&
					    (SRpnt->sense[13] == 1 || SRpnt->sense[13] == 8)) {
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						/* in the process of becoming ready */
						msleep(100);
						continue;
					}
					if (STp->buffer->syscall_result)
						flag = 1;
					break;
				}
#if DEBUG
				debugging = dbg;
				printk(OSST_DEB_MSG "%s:D: Wait re-write finished\n", name);
#endif
			}
		}
		*aSRpnt = SRpnt;
		if (flag) {
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			if ((SRpnt->sense[ 2] & 0x0f) == 13 &&
			     SRpnt->sense[12]         ==  0 &&
			     SRpnt->sense[13]         ==  2) {
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				printk(KERN_ERR "%s:E: Volume overflow in write error recovery\n", name);
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				vfree(buffer);
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				return (-EIO);			/* hit end of tape = fail */
			}
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			i = ((SRpnt->sense[3] << 24) |
			     (SRpnt->sense[4] << 16) |
			     (SRpnt->sense[5] <<  8) |
			      SRpnt->sense[6]        ) - new_frame;
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			p = &buffer[i * OS_DATA_SIZE];
#if DEBUG
			printk(OSST_DEB_MSG "%s:D: Additional write error at %d\n", name, new_frame+i);
#endif
			osst_get_frame_position(STp, aSRpnt);
#if DEBUG
			printk(OSST_DEB_MSG "%s:D: reported frame positions: host = %d, tape = %d, buffer = %d\n",
					  name, STp->first_frame_position, STp->last_frame_position, STp->cur_frames);
#endif
		}
	}
	if (flag) {
		/* error recovery did not successfully complete */
		printk(KERN_ERR "%s:D: Write error recovery failed in %s\n", name,
				STp->write_type == OS_WRITE_HEADER?"header":"body");
	}
	if (!pending)
		osst_copy_to_buffer(STp->buffer, p);	/* so buffer content == at entry in all cases */
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	vfree(buffer);
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	return 0;
}

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static int osst_reposition_and_retry(struct osst_tape * STp, struct osst_request ** aSRpnt,
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					unsigned int frame, unsigned int skip, int pending)
{
	unsigned char		cmd[MAX_COMMAND_SIZE];
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	struct osst_request   * SRpnt;
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	char		      * name      = tape_name(STp);
	int			expected  = 0;
	int			attempts  = 1000 / skip;
	int			flag      = 1;
	unsigned long		startwait = jiffies;
#if DEBUG
	int			dbg       = debugging;
#endif

	while (attempts && time_before(jiffies, startwait + 60*HZ)) {
		if (flag) {
#if DEBUG
			debugging = dbg;
#endif
			if (frame < 2990 && frame+skip+STp->cur_frames+pending >= 2990)
				frame = 3000-skip;
			expected = frame+skip+STp->cur_frames+pending;
#if DEBUG
			printk(OSST_DEB_MSG "%s:D: Position to fppos %d, re-write from fseq %d\n",
					  name, frame+skip, STp->frame_seq_number-STp->cur_frames-pending);
#endif
			osst_set_frame_position(STp, aSRpnt, frame + skip, 1);
			flag = 0;
			attempts--;
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			schedule_timeout_interruptible(msecs_to_jiffies(100));
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		}
		if (osst_get_frame_position(STp, aSRpnt) < 0) {		/* additional write error */
#if DEBUG
			printk(OSST_DEB_MSG "%s:D: Addl error, host %d, tape %d, buffer %d\n",
					  name, STp->first_frame_position,
					  STp->last_frame_position, STp->cur_frames);
#endif
			frame = STp->last_frame_position;
			flag = 1;
			continue;
		}
		if (pending && STp->cur_frames < 50) {

			memset(cmd, 0, MAX_COMMAND_SIZE);
			cmd[0] = WRITE_6;
			cmd[1] = 1;
			cmd[4] = 1;
#if DEBUG
			printk(OSST_DEB_MSG "%s:D: About to write pending fseq %d at fppos %d\n",
					  name, STp->frame_seq_number-1, STp->first_frame_position);
#endif
			SRpnt = osst_do_scsi(*aSRpnt, STp, cmd, OS_FRAME_SIZE, DMA_TO_DEVICE,
						      STp->timeout, MAX_RETRIES, 1);
			*aSRpnt = SRpnt;

			if (STp->buffer->syscall_result) {		/* additional write error */
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				if ((SRpnt->sense[ 2] & 0x0f) == 13 &&
				     SRpnt->sense[12]         ==  0 &&
				     SRpnt->sense[13]         ==  2) {
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					printk(KERN_ERR
					       "%s:E: Volume overflow in write error recovery\n",
					       name);
					break;				/* hit end of tape = fail */
				}
				flag = 1;
			}
			else
				pending = 0;

			continue;
		}
		if (STp->cur_frames == 0) {
#if DEBUG
			debugging = dbg;
			printk(OSST_DEB_MSG "%s:D: Wait re-write finished\n", name);
#endif
			if (STp->first_frame_position != expected) {
				printk(KERN_ERR "%s:A: Actual position %d - expected %d\n", 
						name, STp->first_frame_position, expected);
				return (-EIO);
			}
			return 0;
		}
#if DEBUG
		if (debugging) {
			printk(OSST_DEB_MSG "%s:D: Sleeping in re-write wait ready\n", name);
			printk(OSST_DEB_MSG "%s:D: Turning off debugging for a while\n", name);
			debugging = 0;
		}
#endif
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		schedule_timeout_interruptible(msecs_to_jiffies(100));
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	}
	printk(KERN_ERR "%s:E: Failed to find valid tape media\n", name);
#if DEBUG
	debugging = dbg;
#endif
	return (-EIO);
}

/*
 * Error recovery algorithm for the OnStream tape.
 */

1688
static int osst_write_error_recovery(struct osst_tape * STp, struct osst_request ** aSRpnt, int pending)
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{
1690
	struct osst_request * SRpnt  = * aSRpnt;
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	struct st_partstat  * STps   = & STp->ps[STp->partition];
	char		    * name   = tape_name(STp);
	int		      retval = 0;
	int		      rw_state;
	unsigned int	      frame, skip;

	rw_state = STps->rw;

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	if ((SRpnt->sense[ 2] & 0x0f) != 3
	  || SRpnt->sense[12]         != 12
	  || SRpnt->sense[13]         != 0) {
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#if DEBUG
		printk(OSST_DEB_MSG "%s:D: Write error recovery cannot handle %02x:%02x:%02x\n", name,
1704
			SRpnt->sense[2], SRpnt->sense[12], SRpnt->sense[13]);
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#endif
		return (-EIO);
	}
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	frame =	(SRpnt->sense[3] << 24) |
		(SRpnt->sense[4] << 16) |
		(SRpnt->sense[5] <<  8) |
		 SRpnt->sense[6];
	skip  =  SRpnt->sense[9];
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#if DEBUG
	printk(OSST_DEB_MSG "%s:D: Detected physical bad frame at %u, advised to skip %d\n", name, frame, skip);
#endif
	osst_get_frame_position(STp, aSRpnt);
#if DEBUG
	printk(OSST_DEB_MSG "%s:D: reported frame positions: host = %d, tape = %d\n",
			name, STp->first_frame_position, STp->last_frame_position);
#endif
	switch (STp->write_type) {
	   case OS_WRITE_DATA:
	   case OS_WRITE_EOD:
	   case OS_WRITE_NEW_MARK:
		printk(KERN_WARNING 
			"%s:I: Relocating %d buffered logical frames from position %u to %u\n",
			name, STp->cur_frames, frame, (frame + skip > 3000 && frame < 3000)?3000:frame + skip);
		if (STp->os_fw_rev >= 10600)
			retval = osst_reposition_and_retry(STp, aSRpnt, frame, skip, pending);
		else
			retval = osst_read_back_buffer_and_rewrite(STp, aSRpnt, frame, skip, pending);
		printk(KERN_WARNING "%s:%s: %sWrite error%srecovered\n", name,
			       	retval?"E"    :"I",
			       	retval?""     :"Don't worry, ",
			       	retval?" not ":" ");
		break;
	   case OS_WRITE_LAST_MARK:
		printk(KERN_ERR "%s:E: Bad frame in update last marker, fatal\n", name);
		osst_set_frame_position(STp, aSRpnt, frame + STp->cur_frames + pending, 0);
		retval = -EIO;
		break;
	   case OS_WRITE_HEADER:
		printk(KERN_WARNING "%s:I: Bad frame in header partition, skipped\n", name);
		retval = osst_read_back_buffer_and_rewrite(STp, aSRpnt, frame, 1, pending);
		break;
	   default:
		printk(KERN_INFO "%s:I: Bad frame in filler, ignored\n", name);
		osst_set_frame_position(STp, aSRpnt, frame + STp->cur_frames + pending, 0);
	}
	osst_get_frame_position(STp, aSRpnt);
#if DEBUG
	printk(OSST_DEB_MSG "%s:D: Positioning complete, cur_frames %d, pos %d, tape pos %d\n", 
			name, STp->cur_frames, STp->first_frame_position, STp->last_frame_position);
	printk(OSST_DEB_MSG "%s:D: next logical frame to write: %d\n", name, STp->logical_blk_num);
#endif
	if (retval == 0) {
		STp->recover_count++;
		STp->recover_erreg++;
	} else
		STp->abort_count++;

	STps->rw = rw_state;
	return retval;
}

1767
static int osst_space_over_filemarks_backward(struct osst_tape * STp, struct osst_request ** aSRpnt,
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								 int mt_op, int mt_count)
{
	char  * name = tape_name(STp);
	int     cnt;
	int     last_mark_ppos = -1;

#if DEBUG
	printk(OSST_DEB_MSG "%s:D: Reached space_over_filemarks_backwards %d %d\n", name, mt_op, mt_count);
#endif
	if (osst_get_logical_frame(STp, aSRpnt, -1, 0) < 0) {
#if DEBUG
		printk(OSST_DEB_MSG "%s:D: Couldn't get logical blk num in space_filemarks_bwd\n", name);
#endif
		return -EIO;
	}
	if (STp->linux_media_version >= 4) {
		/*
		 * direct lookup in header filemark list
		 */
		cnt = ntohl(STp->buffer->aux->filemark_cnt);
		if (STp->header_ok                         && 
		    STp->header_cache != NULL              &&
		    (cnt - mt_count)  >= 0                 &&
		    (cnt - mt_count)   < OS_FM_TAB_MAX     &&
		    (cnt - mt_count)   < STp->filemark_cnt &&
		    STp->header_cache->dat_fm_tab.fm_tab_ent[cnt-1] == STp->buffer->aux->last_mark_ppos)

			last_mark_ppos = ntohl(STp->header_cache->dat_fm_tab.fm_tab_ent[cnt - mt_count]);
#if DEBUG
		if (STp->header_cache == NULL || (cnt - mt_count) < 0 || (cnt - mt_count) >= OS_FM_TAB_MAX)
			printk(OSST_DEB_MSG "%s:D: Filemark lookup fail due to %s\n", name,
			       STp->header_cache == NULL?"lack of header cache":"count out of range");
		else
			printk(OSST_DEB_MSG "%s:D: Filemark lookup: prev mark %d (%s), skip %d to %d\n",
				name, cnt,
				((cnt == -1 && ntohl(STp->buffer->aux->last_mark_ppos) == -1) ||
				 (STp->header_cache->dat_fm_tab.fm_tab_ent[cnt-1] ==
					 STp->buffer->aux->last_mark_ppos))?"match":"error",
			       mt_count, last_mark_ppos);
#endif
		if (last_mark_ppos > 10 && last_mark_ppos < STp->eod_frame_ppos) {
			osst_position_tape_and_confirm(STp, aSRpnt, last_mark_ppos);
			if (osst_get_logical_frame(STp, aSRpnt, -1, 0) < 0) {
#if DEBUG
				printk(OSST_DEB_MSG 
					"%s:D: Couldn't get logical blk num in space_filemarks\n", name);
#endif
				return (-EIO);
			}
			if (STp->buffer->aux->frame_type != OS_FRAME_TYPE_MARKER) {
				printk(KERN_WARNING "%s:W: Expected to find marker at ppos %d, not found\n",
						 name, last_mark_ppos);
				return (-EIO);
			}
			goto found;
		}
#if DEBUG
		printk(OSST_DEB_MSG "%s:D: Reverting to scan filemark backwards\n", name);
#endif
	}
	cnt = 0;
	while (cnt != mt_count) {
		last_mark_ppos = ntohl(STp->buffer->aux->last_mark_ppos);
		if (last_mark_ppos == -1)
			return (-EIO);
#if DEBUG
		printk(OSST_DEB_MSG "%s:D: Positioning to last mark at %d\n", name, last_mark_ppos);
#endif
		osst_position_tape_and_confirm(STp, aSRpnt, last_mark_ppos);
		cnt++;
		if (osst_get_logical_frame(STp, aSRpnt, -1, 0) < 0) {
#if DEBUG
			printk(OSST_DEB_MSG "%s:D: Couldn't get logical blk num in space_filemarks\n", name);
#endif
			return (-EIO);
		}
		if (STp->buffer->aux->frame_type != OS_FRAME_TYPE_MARKER) {
			printk(KERN_WARNING "%s:W: Expected to find marker at ppos %d, not found\n",
					 name, last_mark_ppos);
			return (-EIO);
		}
	}
found:
	if (mt_op == MTBSFM) {
		STp->frame_seq_number++;
		STp->frame_in_buffer      = 0;
		STp->buffer->buffer_bytes = 0;
		STp->buffer->read_pointer = 0;
		STp->logical_blk_num     += ntohs(STp->buffer->aux->dat.dat_list[0].blk_cnt);
	}
	return 0;
}

/*
 * ADRL 1.1 compatible "slow" space filemarks fwd version
 *
 * Just scans for the filemark sequentially.
 */
1866
static int osst_space_over_filemarks_forward_slow(struct osst_tape * STp, struct osst_request ** aSRpnt,
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								     int mt_op, int mt_count)
{
	int	cnt = 0;
#if DEBUG
	char  * name = tape_name(STp);

	printk(OSST_DEB_MSG "%s:D: Reached space_over_filemarks_forward_slow %d %d\n", name, mt_op, mt_count);
#endif
	if (osst_get_logical_frame(STp, aSRpnt, -1, 0) < 0) {
#if DEBUG
		printk(OSST_DEB_MSG "%s:D: Couldn't get logical blk num in space_filemarks_fwd\n", name);
#endif
		return (-EIO);
	}
	while (1) {
		if (osst_get_logical_frame(STp, aSRpnt, -1, 0) < 0) {
#if DEBUG
			printk(OSST_DEB_MSG "%s:D: Couldn't get logical blk num in space_filemarks\n", name);
#endif
			return (-EIO);
		}
		if (STp->buffer->aux->frame_type == OS_FRAME_TYPE_MARKER)
			cnt++;
		if (STp->buffer->aux->frame_type == OS_FRAME_TYPE_EOD) {
#if DEBUG
			printk(OSST_DEB_MSG "%s:D: space_fwd: EOD reached\n", name);
#endif
			if (STp->first_frame_position > STp->eod_frame_ppos+1) {
#if DEBUG
				printk(OSST_DEB_MSG "%s:D: EOD position corrected (%d=>%d)\n",
					       	name, STp->eod_frame_ppos, STp->first_frame_position-1);
#endif
				STp->eod_frame_ppos = STp->first_frame_position-1;
			}
			return (-EIO);
		}
		if (cnt == mt_count)
			break;
		STp->frame_in_buffer = 0;
	}
	if (mt_op == MTFSF) {
		STp->frame_seq_number++;
		STp->frame_in_buffer      = 0;
		STp->buffer->buffer_bytes = 0;
		STp->buffer->read_pointer = 0;
		STp->logical_blk_num     += ntohs(STp->buffer->aux->dat.dat_list[0].blk_cnt);
	}
	return 0;
}

/*
 * Fast linux specific version of OnStream FSF
 */
1920
static int osst_space_over_filemarks_forward_fast(struct osst_tape * STp, struct osst_request ** aSRpnt,
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								     int mt_op, int mt_count)
{
	char  * name = tape_name(STp);
	int	cnt  = 0,
		next_mark_ppos = -1;

#if DEBUG
	printk(OSST_DEB_MSG "%s:D: Reached space_over_filemarks_forward_fast %d %d\n", name, mt_op, mt_count);
#endif
	if (osst_get_logical_frame(STp, aSRpnt, -1, 0) < 0) {
#if DEBUG
		printk(OSST_DEB_MSG "%s:D: Couldn't get logical blk num in space_filemarks_fwd\n", name);
#endif
		return (-EIO);
	}

	if (STp->linux_media_version >= 4) {
		/*
		 * direct lookup in header filemark list
		 */
		cnt = ntohl(STp->buffer->aux->filemark_cnt) - 1;
		if (STp->header_ok                         && 
		    STp->header_cache != NULL              &&
		    (cnt + mt_count)   < OS_FM_TAB_MAX     &&
		    (cnt + mt_count)   < STp->filemark_cnt &&
		    ((cnt == -1 && ntohl(STp->buffer->aux->last_mark_ppos) == -1) ||
		     (STp->header_cache->dat_fm_tab.fm_tab_ent[cnt] == STp->buffer->aux->last_mark_ppos)))

			next_mark_ppos = ntohl(STp->header_cache->dat_fm_tab.fm_tab_ent[cnt + mt_count]);
#if DEBUG
		if (STp->header_cache == NULL || (cnt + mt_count) >= OS_FM_TAB_MAX)
			printk(OSST_DEB_MSG "%s:D: Filemark lookup fail due to %s\n", name,
			       STp->header_cache == NULL?"lack of header cache":"count out of range");
		else
			printk(OSST_DEB_MSG "%s:D: Filemark lookup: prev mark %d (%s), skip %d to %d\n",
			       name, cnt,
			       ((cnt == -1 && ntohl(STp->buffer->aux->last_mark_ppos) == -1) ||
				(STp->header_cache->dat_fm_tab.fm_tab_ent[cnt] ==
					 STp->buffer->aux->last_mark_ppos))?"match":"error",
			       mt_count, next_mark_ppos);
#endif
		if (next_mark_ppos <= 10 || next_mark_ppos > STp->eod_frame_ppos) {
#if DEBUG
			printk(OSST_DEB_MSG "%s:D: Reverting to slow filemark space\n", name);
#endif
			return osst_space_over_filemarks_forward_slow(STp, aSRpnt, mt_op, mt_count);
		} else {
			osst_position_tape_and_confirm(STp, aSRpnt, next_mark_ppos);
			if (osst_get_logical_frame(STp, aSRpnt, -1, 0) < 0) {
#if DEBUG
				printk(OSST_DEB_MSG "%s:D: Couldn't get logical blk num in space_filemarks\n",
						 name);
#endif
				return (-EIO);
			}
			if (STp->buffer->aux->frame_type != OS_FRAME_TYPE_MARKER) {
				printk(KERN_WARNING "%s:W: Expected to find marker at ppos %d, not found\n",
						 name, next_mark_ppos);
				return (-EIO);
			}
			if (ntohl(STp->buffer->aux->filemark_cnt) != cnt + mt_count) {
				printk(KERN_WARNING "%s:W: Expected to find marker %d at ppos %d, not %d\n",
						 name, cnt+mt_count, next_mark_ppos,
						 ntohl(STp->buffer->aux->filemark_cnt));
       				return (-EIO);
			}
		}
	} else {
		/*
		 * Find nearest (usually previous) marker, then jump from marker to marker
		 */
		while (1) {
			if (STp->buffer->aux->frame_type == OS_FRAME_TYPE_MARKER)
				break;
			if (STp->buffer->aux->frame_type == OS_FRAME_TYPE_EOD) {
#if DEBUG
				printk(OSST_DEB_MSG "%s:D: space_fwd: EOD reached\n", name);
#endif
				return (-EIO);
			}
			if (ntohl(STp->buffer->aux->filemark_cnt) == 0) {
				if (STp->first_mark_ppos == -1) {
#if DEBUG
					printk(OSST_DEB_MSG "%s:D: Reverting to slow filemark space\n", name);
#endif
					return osst_space_over_filemarks_forward_slow(STp, aSRpnt, mt_op, mt_count);
				}
				osst_position_tape_and_confirm(STp, aSRpnt, STp->first_mark_ppos);
				if (osst_get_logical_frame(STp, aSRpnt, -1, 0) < 0) {
#if DEBUG
					printk(OSST_DEB_MSG
					       "%s:D: Couldn't get logical blk num in space_filemarks_fwd_fast\n",
					       name);
#endif
					return (-EIO);
				}
				if (STp->buffer->aux->frame_type != OS_FRAME_TYPE_MARKER) {
					printk(KERN_WARNING "%s:W: Expected to find filemark at %d\n",
							 name, STp->first_mark_ppos);
					return (-EIO);
				}
			} else {
				if (osst_space_over_filemarks_backward(STp, aSRpnt, MTBSF, 1) < 0)
					return (-EIO);
				mt_count++;
			}
		}
		cnt++;
		while (cnt != mt_count) {
			next_mark_ppos = ntohl(STp->buffer->aux->next_mark_ppos);
			if (!next_mark_ppos || next_mark_ppos > STp->eod_frame_ppos) {
#if DEBUG
				printk(OSST_DEB_MSG "%s:D: Reverting to slow filemark space\n", name);
#endif
				return osst_space_over_filemarks_forward_slow(STp, aSRpnt, mt_op, mt_count - cnt);
			}
#if DEBUG
			else printk(OSST_DEB_MSG "%s:D: Positioning to next mark at %d\n", name, next_mark_ppos);
#endif
			osst_position_tape_and_confirm(STp, aSRpnt, next_mark_ppos);
			cnt++;
			if (osst_get_logical_frame(STp, aSRpnt, -1, 0) < 0) {
#if DEBUG
				printk(OSST_DEB_MSG "%s:D: Couldn't get logical blk num in space_filemarks\n",
						 name);
#endif
				return (-EIO);
			}
			if (STp->buffer->aux->frame_type != OS_FRAME_TYPE_MARKER) {
				printk(KERN_WARNING "%s:W: Expected to find marker at ppos %d, not found\n",
						 name, next_mark_ppos);
				return (-EIO);
			}
		}
	}
	if (mt_op == MTFSF) {
		STp->frame_seq_number++;
		STp->frame_in_buffer      = 0;
		STp->buffer->buffer_bytes = 0;
		STp->buffer->read_pointer = 0;
		STp->logical_blk_num     += ntohs(STp->buffer->aux->dat.dat_list[0].blk_cnt);
	}
	return 0;
}

/*
 * In debug mode, we want to see as many errors as possible
 * to test the error recovery mechanism.
 */
#if DEBUG
2071
static void osst_set_retries(struct osst_tape * STp, struct osst_request ** aSRpnt, int retries)
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{
	unsigned char		cmd[MAX_COMMAND_SIZE];
2074
	struct osst_request   * SRpnt  = * aSRpnt;
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	char		      * name   = tape_name(STp);

	memset(cmd, 0, MAX_COMMAND_SIZE);
	cmd[0] = MODE_SELECT;
	cmd[1] = 0x10;
	cmd[4] = NUMBER_RETRIES_PAGE_LENGTH + MODE_HEADER_LENGTH;

	(STp->buffer)->b_data[0] = cmd[4] - 1;
	(STp->buffer)->b_data[1] = 0;			/* Medium Type - ignoring */
	(STp->buffer)->b_data[2] = 0;			/* Reserved */
	(STp->buffer)->b_data[3] = 0;			/* Block Descriptor Length */
	(STp->buffer)->b_data[MODE_HEADER_LENGTH + 0] = NUMBER_RETRIES_PAGE | (1 << 7);
	(STp->buffer)->b_data[MODE_HEADER_LENGTH + 1] = 2;
	(STp->buffer)->b_data[MODE_HEADER_LENGTH + 2] = 4;
	(STp->buffer)->b_data[MODE_HEADER_LENGTH + 3] = retries;

	if (debugging)
	    printk(OSST_DEB_MSG "%s:D: Setting number of retries on OnStream tape to %d\n", name, retries);

	SRpnt = osst_do_scsi(SRpnt, STp, cmd, cmd[4], DMA_TO_DEVICE, STp->timeout, 0, 1);
	*aSRpnt = SRpnt;

	if ((STp->buffer)->syscall_result)
	    printk (KERN_ERR "%s:D: Couldn't set retries to %d\n", name, retries);
}
#endif


2103
static int osst_write_filemark(struct osst_tape * STp, struct osst_request ** aSRpnt)
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{
	int	result;
	int	this_mark_ppos = STp->first_frame_position;
	int	this_mark_lbn  = STp->logical_blk_num;
#if DEBUG
	char  * name = tape_name(STp);
#endif

	if (STp->raw) return 0;

	STp->write_type = OS_WRITE_NEW_MARK;
#if DEBUG
	printk(OSST_DEB_MSG "%s:D: Writing Filemark %i at fppos %d (fseq %d, lblk %d)\n", 
	       name, STp->filemark_cnt, this_mark_ppos, STp->frame_seq_number, this_mark_lbn);
#endif
	STp->dirty = 1;
	result  = osst_flush_write_buffer(STp, aSRpnt);
	result |= osst_flush_drive_buffer(STp, aSRpnt);
	STp->last_mark_ppos = this_mark_ppos;
	STp->last_mark_lbn  = this_mark_lbn;
	if (STp->header_cache != NULL && STp->filemark_cnt < OS_FM_TAB_MAX)
		STp->header_cache->dat_fm_tab.fm_tab_ent[STp->filemark_cnt] = htonl(this_mark_ppos);
	if (STp->filemark_cnt++ == 0)
		STp->first_mark_ppos = this_mark_ppos;
	return result;
}

2131
static int osst_write_eod(struct osst_tape * STp, struct osst_request ** aSRpnt)
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{
	int	result;
#if DEBUG
	char  * name = tape_name(STp);
#endif

	if (STp->raw) return 0;

	STp->write_type = OS_WRITE_EOD;
	STp->eod_frame_ppos = STp->first_frame_position;
#if DEBUG
	printk(OSST_DEB_MSG "%s:D: Writing EOD at fppos %d (fseq %d, lblk %d)\n", name,
			STp->eod_frame_ppos, STp->frame_seq_number, STp->logical_blk_num);
#endif
	STp->dirty = 1;

	result  = osst_flush_write_buffer(STp, aSRpnt);	
	result |= osst_flush_drive_buffer(STp, aSRpnt);
	STp->eod_frame_lfa = --(STp->frame_seq_number);
	return result;
}

2154
static int osst_write_filler(struct osst_tape * STp, struct osst_request ** aSRpnt, int where, int count)
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{
	char * name = tape_name(STp);

#if DEBUG
	printk(OSST_DEB_MSG "%s:D: Reached onstream write filler group %d\n", name, where);
#endif
	osst_wait_ready(STp, aSRpnt, 60 * 5, 0);
	osst_set_frame_position(STp, aSRpnt, where, 0);
	STp->write_type = OS_WRITE_FILLER;
	while (count--) {
		memcpy(STp->buffer->b_data, "Filler", 6);
		STp->buffer->buffer_bytes = 6;
		STp->dirty = 1;
		if (osst_flush_write_buffer(STp, aSRpnt)) {
			printk(KERN_INFO "%s:I: Couldn't write filler frame\n", name);
			return (-EIO);
		}
	}
#if DEBUG
	printk(OSST_DEB_MSG "%s:D: Exiting onstream write filler group\n", name);
#endif
	return osst_flush_drive_buffer(STp, aSRpnt);
}

2179
static int __osst_write_header(struct osst_tape * STp, struct osst_request ** aSRpnt, int where, int count)
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{
	char * name = tape_name(STp);
	int     result;

#if DEBUG
	printk(OSST_DEB_MSG "%s:D: Reached onstream write header group %d\n", name, where);
#endif
	osst_wait_ready(STp, aSRpnt, 60 * 5, 0);
	osst_set_frame_position(STp, aSRpnt, where, 0);
	STp->write_type = OS_WRITE_HEADER;
	while (count--) {
		osst_copy_to_buffer(STp->buffer, (unsigned char *)STp->header_cache);
		STp->buffer->buffer_bytes = sizeof(os_header_t);
		STp->dirty = 1;
		if (osst_flush_write_buffer(STp, aSRpnt)) {
			printk(KERN_INFO "%s:I: Couldn't write header frame\n", name);
			return (-EIO);
		}
	}
	result = osst_flush_drive_buffer(STp, aSRpnt);
#if DEBUG
	printk(OSST_DEB_MSG "%s:D: Write onstream header group %s\n", name, result?"failed":"done");
#endif
	return result;
}

2206
static int osst_write_header(struct osst_tape * STp, struct osst_request ** aSRpnt, int locate_eod)
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{
	os_header_t * header;
	int	      result;
	char        * name = tape_name(STp);

#if DEBUG
	printk(OSST_DEB_MSG "%s:D: Writing tape header\n", name);
#endif
	if (STp->raw) return 0;

	if (STp->header_cache == NULL) {
		if ((STp->header_cache = (os_header_t *)vmalloc(sizeof(os_header_t))) == NULL) {
			printk(KERN_ERR "%s:E: Failed to allocate header cache\n", name);
			return (-ENOMEM);
		}
		memset(STp->header_cache, 0, sizeof(os_header_t));
#if DEBUG
		printk(OSST_DEB_MSG "%s:D: Allocated and cleared memory for header cache\n", name);
#endif
	}
	if (STp->header_ok) STp->update_frame_cntr++;
	else                STp->update_frame_cntr = 0;

	header = STp->header_cache;
	strcpy(header->ident_str, "ADR_SEQ");
	header->major_rev      = 1;
	header->minor_rev      = 4;
	header->ext_trk_tb_off = htons(17192);
	header->pt_par_num     = 1;
	header->partition[0].partition_num              = OS_DATA_PARTITION;
	header->partition[0].par_desc_ver               = OS_PARTITION_VERSION;
	header->partition[0].wrt_pass_cntr              = htons(STp->wrt_pass_cntr);
	header->partition[0].first_frame_ppos           = htonl(STp->first_data_ppos);
	header->partition[0].last_frame_ppos            = htonl(STp->capacity);
	header->partition[0].eod_frame_ppos             = htonl(STp->eod_frame_ppos);
	header->cfg_col_width                           = htonl(20);
	header->dat_col_width                           = htonl(1500);
	header->qfa_col_width                           = htonl(0);
	header->ext_track_tb.nr_stream_part             = 1;
	header->ext_track_tb.et_ent_sz                  = 32;
	header->ext_track_tb.dat_ext_trk_ey.et_part_num = 0;
	header->ext_track_tb.dat_ext_trk_ey.fmt         = 1;
	header->ext_track_tb.dat_ext_trk_ey.fm_tab_off  = htons(17736);
	header->ext_track_tb.dat_ext_trk_ey.last_hlb_hi = 0;
	header->ext_track_tb.dat_ext_trk_ey.last_hlb    = htonl(STp->eod_frame_lfa);
	header->ext_track_tb.dat_ext_trk_ey.last_pp	= htonl(STp->eod_frame_ppos);
	header->dat_fm_tab.fm_part_num                  = 0;
	header->dat_fm_tab.fm_tab_ent_sz                = 4;
	header->dat_fm_tab.fm_tab_ent_cnt               = htons(STp->filemark_cnt<OS_FM_TAB_MAX?
								STp->filemark_cnt:OS_FM_TAB_MAX);

	result  = __osst_write_header(STp, aSRpnt, 0xbae, 5);
	if (STp->update_frame_cntr == 0)
		    osst_write_filler(STp, aSRpnt, 0xbb3, 5);
	result &= __osst_write_header(STp, aSRpnt,     5, 5);

	if (locate_eod) {
#if DEBUG
		printk(OSST_DEB_MSG "%s:D: Locating back to eod frame addr %d\n", name, STp->eod_frame_ppos);
#endif
		osst_set_frame_position(STp, aSRpnt, STp->eod_frame_ppos, 0);
	}
	if (result)
		printk(KERN_ERR "%s:E: Write header failed\n", name);
	else {
		memcpy(STp->application_sig, "LIN4", 4);
		STp->linux_media         = 1;
		STp->linux_media_version = 4;
		STp->header_ok           = 1;
	}
	return result;
}

2280
static int osst_reset_header(struct osst_tape * STp, struct osst_request ** aSRpnt)
L
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{
	if (STp->header_cache != NULL)
		memset(STp->header_cache, 0, sizeof(os_header_t));

	STp->logical_blk_num = STp->frame_seq_number = 0;
	STp->frame_in_buffer = 0;
	STp->eod_frame_ppos = STp->first_data_ppos = 0x0000000A;
	STp->filemark_cnt = 0;
	STp->first_mark_ppos = STp->last_mark_ppos = STp->last_mark_lbn = -1;
	return osst_write_header(STp, aSRpnt, 1);
}

2293
static int __osst_analyze_headers(struct osst_tape * STp, struct osst_request ** aSRpnt, int ppos)
L
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{
	char        * name = tape_name(STp);
	os_header_t * header;
	os_aux_t    * aux;
	char          id_string[8];
	int	      linux_media_version,
		      update_frame_cntr;

	if (STp->raw)
		return 1;

	if (ppos == 5 || ppos == 0xbae || STp->buffer->syscall_result) {
		if (osst_set_frame_position(STp, aSRpnt, ppos, 0))
			printk(KERN_WARNING "%s:W: Couldn't position tape\n", name);
		osst_wait_ready(STp, aSRpnt, 60 * 15, 0);
		if (osst_initiate_read (STp, aSRpnt)) {
			printk(KERN_WARNING "%s:W: Couldn't initiate read\n", name);
			return 0;
		}
	}
	if (osst_read_frame(STp, aSRpnt, 180)) {
#if DEBUG
		printk(OSST_DEB_MSG "%s:D: Couldn't read header frame\n", name);
#endif
		return 0;
	}
	header = (os_header_t *) STp->buffer->b_data;	/* warning: only first segment addressable */
	aux = STp->buffer->aux;
	if (aux->frame_type != OS_FRAME_TYPE_HEADER) {
#if DEBUG
		printk(OSST_DEB_MSG "%s:D: Skipping non-header frame (%d)\n", name, ppos);
#endif
		return 0;
	}
	if (ntohl(aux->frame_seq_num)              != 0                   ||
	    ntohl(aux->logical_blk_num)            != 0                   ||
	          aux->partition.partition_num     != OS_CONFIG_PARTITION ||
	    ntohl(aux->partition.first_frame_ppos) != 0                   ||
	    ntohl(aux->partition.last_frame_ppos)  != 0xbb7               ) {
#if DEBUG
		printk(OSST_DEB_MSG "%s:D: Invalid header frame (%d,%d,%d,%d,%d)\n", name,
				ntohl(aux->frame_seq_num), ntohl(aux->logical_blk_num),
			       	aux->partition.partition_num, ntohl(aux->partition.first_frame_ppos),
			       	ntohl(aux->partition.last_frame_ppos));
#endif
		return 0;
	}
	if (strncmp(header->ident_str, "ADR_SEQ", 7) != 0 &&
	    strncmp(header->ident_str, "ADR-SEQ", 7) != 0) {
		strlcpy(id_string, header->ident_str, 8);
#if DEBUG
		printk(OSST_DEB_MSG "%s:D: Invalid header identification string %s\n", name, id_string);
#endif
		return 0;
	}
	update_frame_cntr = ntohl(aux->update_frame_cntr);
	if (update_frame_cntr < STp->update_frame_cntr) {
#if DEBUG
		printk(OSST_DEB_MSG "%s:D: Skipping frame %d with update_frame_counter %d<%d\n",
				   name, ppos, update_frame_cntr, STp->update_frame_cntr);
#endif
		return 0;
	}
	if (header->major_rev != 1 || header->minor_rev != 4 ) {
#if DEBUG
		printk(OSST_DEB_MSG "%s:D: %s revision %d.%d detected (1.4 supported)\n", 
				 name, (header->major_rev != 1 || header->minor_rev < 2 || 
				       header->minor_rev  > 4 )? "Invalid" : "Warning:",
				 header->major_rev, header->minor_rev);
#endif
		if (header->major_rev != 1 || header->minor_rev < 2 || header->minor_rev > 4)
			return 0;
	}
#if DEBUG
	if (header->pt_par_num != 1)
		printk(KERN_INFO "%s:W: %d partitions defined, only one supported\n", 
				 name, header->pt_par_num);
#endif
	memcpy(id_string, aux->application_sig, 4);
	id_string[4] = 0;
	if (memcmp(id_string, "LIN", 3) == 0) {
		STp->linux_media = 1;
		linux_media_version = id_string[3] - '0';
		if (linux_media_version != 4)
			printk(KERN_INFO "%s:I: Linux media version %d detected (current 4)\n",
					 name, linux_media_version);
	} else {
		printk(KERN_WARNING "%s:W: Non Linux media detected (%s)\n", name, id_string);
		return 0;
	}
	if (linux_media_version < STp->linux_media_version) {
#if DEBUG
		printk(OSST_DEB_MSG "%s:D: Skipping frame %d with linux_media_version %d\n",
				  name, ppos, linux_media_version);
#endif
		return 0;
	}
	if (linux_media_version > STp->linux_media_version) {
#if DEBUG
		printk(OSST_DEB_MSG "%s:D: Frame %d sets linux_media_version to %d\n",
				   name, ppos, linux_media_version);
#endif
		memcpy(STp->application_sig, id_string, 5);
		STp->linux_media_version = linux_media_version;
		STp->update_frame_cntr = -1;
	}
	if (update_frame_cntr > STp->update_frame_cntr) {
#if DEBUG
		printk(OSST_DEB_MSG "%s:D: Frame %d sets update_frame_counter to %d\n",
				   name, ppos, update_frame_cntr);
#endif
		if (STp->header_cache == NULL) {
			if ((STp->header_cache = (os_header_t *)vmalloc(sizeof(os_header_t))) == NULL) {
				printk(KERN_ERR "%s:E: Failed to allocate header cache\n", name);
				return 0;
			}
#if DEBUG
			printk(OSST_DEB_MSG "%s:D: Allocated memory for header cache\n", name);
#endif
		}
		osst_copy_from_buffer(STp->buffer, (unsigned char *)STp->header_cache);
		header = STp->header_cache;	/* further accesses from cached (full) copy */

		STp->wrt_pass_cntr     = ntohs(header->partition[0].wrt_pass_cntr);
		STp->first_data_ppos   = ntohl(header->partition[0].first_frame_ppos);
		STp->eod_frame_ppos    = ntohl(header->partition[0].eod_frame_ppos);
		STp->eod_frame_lfa     = ntohl(header->ext_track_tb.dat_ext_trk_ey.last_hlb);
		STp->filemark_cnt      = ntohl(aux->filemark_cnt);
		STp->first_mark_ppos   = ntohl(aux->next_mark_ppos);
		STp->last_mark_ppos    = ntohl(aux->last_mark_ppos);
		STp->last_mark_lbn     = ntohl(aux->last_mark_lbn);
		STp->update_frame_cntr = update_frame_cntr;
#if DEBUG
	printk(OSST_DEB_MSG "%s:D: Detected write pass %d, update frame counter %d, filemark counter %d\n",
			  name, STp->wrt_pass_cntr, STp->update_frame_cntr, STp->filemark_cnt);
	printk(OSST_DEB_MSG "%s:D: first data frame on tape = %d, last = %d, eod frame = %d\n", name,
			  STp->first_data_ppos,
			  ntohl(header->partition[0].last_frame_ppos),
			  ntohl(header->partition[0].eod_frame_ppos));
	printk(OSST_DEB_MSG "%s:D: first mark on tape = %d, last = %d, eod frame = %d\n", 
			  name, STp->first_mark_ppos, STp->last_mark_ppos, STp->eod_frame_ppos);
#endif
		if (header->minor_rev < 4 && STp->linux_media_version == 4) {
#if DEBUG
			printk(OSST_DEB_MSG "%s:D: Moving filemark list to ADR 1.4 location\n", name);
#endif
			memcpy((void *)header->dat_fm_tab.fm_tab_ent, 
			       (void *)header->old_filemark_list, sizeof(header->dat_fm_tab.fm_tab_ent));
			memset((void *)header->old_filemark_list, 0, sizeof(header->old_filemark_list));
		}
		if (header->minor_rev == 4   &&
		    (header->ext_trk_tb_off                          != htons(17192)               ||
		     header->partition[0].partition_num              != OS_DATA_PARTITION          ||
		     header->partition[0].par_desc_ver               != OS_PARTITION_VERSION       ||
		     header->partition[0].last_frame_ppos            != htonl(STp->capacity)       ||
		     header->cfg_col_width                           != htonl(20)                  ||
		     header->dat_col_width                           != htonl(1500)                ||
		     header->qfa_col_width                           != htonl(0)                   ||
		     header->ext_track_tb.nr_stream_part             != 1                          ||
		     header->ext_track_tb.et_ent_sz                  != 32                         ||
		     header->ext_track_tb.dat_ext_trk_ey.et_part_num != OS_DATA_PARTITION          ||
		     header->ext_track_tb.dat_ext_trk_ey.fmt         != 1                          ||
		     header->ext_track_tb.dat_ext_trk_ey.fm_tab_off  != htons(17736)               ||
		     header->ext_track_tb.dat_ext_trk_ey.last_hlb_hi != 0                          ||
		     header->ext_track_tb.dat_ext_trk_ey.last_pp     != htonl(STp->eod_frame_ppos) ||
		     header->dat_fm_tab.fm_part_num                  != OS_DATA_PARTITION          ||
		     header->dat_fm_tab.fm_tab_ent_sz                != 4                          ||
		     header->dat_fm_tab.fm_tab_ent_cnt               !=
			     htons(STp->filemark_cnt<OS_FM_TAB_MAX?STp->filemark_cnt:OS_FM_TAB_MAX)))
			printk(KERN_WARNING "%s:W: Failed consistency check ADR 1.4 format\n", name);

	}

	return 1;
}

2470
static int osst_analyze_headers(struct osst_tape * STp, struct osst_request ** aSRpnt)
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{
	int	position, ppos;
	int	first, last;
	int	valid = 0;
	char  * name  = tape_name(STp);

	position = osst_get_frame_position(STp, aSRpnt);

	if (STp->raw) {
		STp->header_ok = STp->linux_media = 1;
		STp->linux_media_version = 0;
		return 1;
	}
	STp->header_ok = STp->linux_media = STp->linux_media_version = 0;
	STp->wrt_pass_cntr = STp->update_frame_cntr = -1;
	STp->eod_frame_ppos = STp->first_data_ppos = -1;
	STp->first_mark_ppos = STp->last_mark_ppos = STp->last_mark_lbn = -1;
#if DEBUG
	printk(OSST_DEB_MSG "%s:D: Reading header\n", name);
#endif

	/* optimization for speed - if we are positioned at ppos 10, read second group first  */	
	/* TODO try the ADR 1.1 locations for the second group if we have no valid one yet... */

	first = position==10?0xbae: 5;
	last  = position==10?0xbb3:10;

	for (ppos = first; ppos < last; ppos++)
		if (__osst_analyze_headers(STp, aSRpnt, ppos))
			valid = 1;

	first = position==10? 5:0xbae;
	last  = position==10?10:0xbb3;

	for (ppos = first; ppos < last; ppos++)
		if (__osst_analyze_headers(STp, aSRpnt, ppos))
			valid = 1;

	if (!valid) {
		printk(KERN_ERR "%s:E: Failed to find valid ADRL header, new media?\n", name);
		STp->eod_frame_ppos = STp->first_data_ppos = 0;
		osst_set_frame_position(STp, aSRpnt, 10, 0);
		return 0;
	}
	if (position <= STp->first_data_ppos) {
		position = STp->first_data_ppos;
		STp->ps[0].drv_file = STp->ps[0].drv_block = STp->frame_seq_number = STp->logical_blk_num = 0;
	}
	osst_set_frame_position(STp, aSRpnt, position, 0);
	STp->header_ok = 1;

	return 1;
}

2525
static int osst_verify_position(struct osst_tape * STp, struct osst_request ** aSRpnt)
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{
	int	frame_position  = STp->first_frame_position;
	int	frame_seq_numbr = STp->frame_seq_number;
	int	logical_blk_num = STp->logical_blk_num;
       	int	halfway_frame   = STp->frame_in_buffer;
	int	read_pointer    = STp->buffer->read_pointer;
	int	prev_mark_ppos  = -1;
	int	actual_mark_ppos, i, n;
#if DEBUG
	char  * name = tape_name(STp);

	printk(OSST_DEB_MSG "%s:D: Verify that the tape is really the one we think before writing\n", name);
#endif
	osst_set_frame_position(STp, aSRpnt, frame_position - 1, 0);
	if (osst_get_logical_frame(STp, aSRpnt, -1, 0) < 0) {
#if DEBUG
		printk(OSST_DEB_MSG "%s:D: Couldn't get logical blk num in verify_position\n", name);
#endif
		return (-EIO);
	}
	if (STp->linux_media_version >= 4) {
		for (i=0; i<STp->filemark_cnt; i++)
			if ((n=ntohl(STp->header_cache->dat_fm_tab.fm_tab_ent[i])) < frame_position)
				prev_mark_ppos = n;
	} else
		prev_mark_ppos = frame_position - 1;  /* usually - we don't really know */
	actual_mark_ppos = STp->buffer->aux->frame_type == OS_FRAME_TYPE_MARKER ?
				frame_position - 1 : ntohl(STp->buffer->aux->last_mark_ppos);
	if (frame_position  != STp->first_frame_position                   ||
	    frame_seq_numbr != STp->frame_seq_number + (halfway_frame?0:1) ||
	    prev_mark_ppos  != actual_mark_ppos                            ) {
#if DEBUG
		printk(OSST_DEB_MSG "%s:D: Block mismatch: fppos %d-%d, fseq %d-%d, mark %d-%d\n", name,
				  STp->first_frame_position, frame_position, 
				  STp->frame_seq_number + (halfway_frame?0:1),
				  frame_seq_numbr, actual_mark_ppos, prev_mark_ppos);
#endif
		return (-EIO);
	}
	if (halfway_frame) {
		/* prepare buffer for append and rewrite on top of original */
		osst_set_frame_position(STp, aSRpnt, frame_position - 1, 0);
		STp->buffer->buffer_bytes  = read_pointer;
		STp->ps[STp->partition].rw = ST_WRITING;
		STp->dirty                 = 1;
	}
	STp->frame_in_buffer  = halfway_frame;
	STp->frame_seq_number = frame_seq_numbr;
	STp->logical_blk_num  = logical_blk_num;
	return 0;
}

/* Acc. to OnStream, the vers. numbering is the following:
 * X.XX for released versions (X=digit), 
 * XXXY for unreleased versions (Y=letter)
 * Ordering 1.05 < 106A < 106B < ...  < 106a < ... < 1.06
 * This fn makes monoton numbers out of this scheme ...
 */
static unsigned int osst_parse_firmware_rev (const char * str)
{
	if (str[1] == '.') {
		return (str[0]-'0')*10000
			+(str[2]-'0')*1000
			+(str[3]-'0')*100;
	} else {
		return (str[0]-'0')*10000
			+(str[1]-'0')*1000
			+(str[2]-'0')*100 - 100
			+(str[3]-'@');
	}
}

/*
 * Configure the OnStream SCII tape drive for default operation
 */
2601
static int osst_configure_onstream(struct osst_tape *STp, struct osst_request ** aSRpnt)
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{
	unsigned char                  cmd[MAX_COMMAND_SIZE];
	char                         * name = tape_name(STp);
2605
	struct osst_request          * SRpnt = * aSRpnt;
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	osst_mode_parameter_header_t * header;
	osst_block_size_page_t       * bs;
	osst_capabilities_page_t     * cp;
	osst_tape_paramtr_page_t     * prm;
	int                            drive_buffer_size;

	if (STp->ready != ST_READY) {
#if DEBUG
	    printk(OSST_DEB_MSG "%s:D: Not Ready\n", name);
#endif
	    return (-EIO);
	}
	
	if (STp->os_fw_rev < 10600) {
	    printk(KERN_INFO "%s:I: Old OnStream firmware revision detected (%s),\n", name, STp->device->rev);
	    printk(KERN_INFO "%s:I: an upgrade to version 1.06 or above is recommended\n", name);
	}

	/*
	 * Configure 32.5KB (data+aux) frame size.
         * Get the current frame size from the block size mode page
	 */
	memset(cmd, 0, MAX_COMMAND_SIZE);
	cmd[0] = MODE_SENSE;
	cmd[1] = 8;
	cmd[2] = BLOCK_SIZE_PAGE;
	cmd[4] = BLOCK_SIZE_PAGE_LENGTH + MODE_HEADER_LENGTH;

	SRpnt = osst_do_scsi(SRpnt, STp, cmd, cmd[4], DMA_FROM_DEVICE, STp->timeout, 0, 1);
	if (SRpnt == NULL) {
#if DEBUG
 	    printk(OSST_DEB_MSG "osst :D: Busy\n");
#endif
	    return (-EBUSY);
	}
	*aSRpnt = SRpnt;
	if ((STp->buffer)->syscall_result != 0) {
	    printk (KERN_ERR "%s:E: Can't get tape block size mode page\n", name);
	    return (-EIO);
	}

	header = (osst_mode_parameter_header_t *) (STp->buffer)->b_data;
	bs = (osst_block_size_page_t *) ((STp->buffer)->b_data + sizeof(osst_mode_parameter_header_t) + header->bdl);

#if DEBUG
	printk(OSST_DEB_MSG "%s:D: 32KB play back: %s\n",   name, bs->play32     ? "Yes" : "No");
	printk(OSST_DEB_MSG "%s:D: 32.5KB play back: %s\n", name, bs->play32_5   ? "Yes" : "No");
	printk(OSST_DEB_MSG "%s:D: 32KB record: %s\n",      name, bs->record32   ? "Yes" : "No");
	printk(OSST_DEB_MSG "%s:D: 32.5KB record: %s\n",    name, bs->record32_5 ? "Yes" : "No");
#endif

	/*
	 * Configure default auto columns mode, 32.5KB transfer mode
	 */ 
	bs->one = 1;
	bs->play32 = 0;
	bs->play32_5 = 1;
	bs->record32 = 0;
	bs->record32_5 = 1;

	memset(cmd, 0, MAX_COMMAND_SIZE);
	cmd[0] = MODE_SELECT;
	cmd[1] = 0x10;
	cmd[4] = BLOCK_SIZE_PAGE_LENGTH + MODE_HEADER_LENGTH;

	SRpnt = osst_do_scsi(SRpnt, STp, cmd, cmd[4], DMA_TO_DEVICE, STp->timeout, 0, 1);
	*aSRpnt = SRpnt;
	if ((STp->buffer)->syscall_result != 0) {
	    printk (KERN_ERR "%s:E: Couldn't set tape block size mode page\n", name);
	    return (-EIO);
	}

#if DEBUG
	printk(KERN_INFO "%s:D: Drive Block Size changed to 32.5K\n", name);
	 /*
	 * In debug mode, we want to see as many errors as possible
	 * to test the error recovery mechanism.
	 */
	osst_set_retries(STp, aSRpnt, 0);
	SRpnt = * aSRpnt;
#endif

	/*
	 * Set vendor name to 'LIN4' for "Linux support version 4".
	 */

	memset(cmd, 0, MAX_COMMAND_SIZE);
	cmd[0] = MODE_SELECT;
	cmd[1] = 0x10;
	cmd[4] = VENDOR_IDENT_PAGE_LENGTH + MODE_HEADER_LENGTH;

	header->mode_data_length = VENDOR_IDENT_PAGE_LENGTH + MODE_HEADER_LENGTH - 1;
	header->medium_type      = 0;	/* Medium Type - ignoring */
	header->dsp              = 0;	/* Reserved */
	header->bdl              = 0;	/* Block Descriptor Length */
	
	(STp->buffer)->b_data[MODE_HEADER_LENGTH + 0] = VENDOR_IDENT_PAGE | (1 << 7);
	(STp->buffer)->b_data[MODE_HEADER_LENGTH + 1] = 6;
	(STp->buffer)->b_data[MODE_HEADER_LENGTH + 2] = 'L';
	(STp->buffer)->b_data[MODE_HEADER_LENGTH + 3] = 'I';
	(STp->buffer)->b_data[MODE_HEADER_LENGTH + 4] = 'N';
	(STp->buffer)->b_data[MODE_HEADER_LENGTH + 5] = '4';
	(STp->buffer)->b_data[MODE_HEADER_LENGTH + 6] = 0;
	(STp->buffer)->b_data[MODE_HEADER_LENGTH + 7] = 0;

	SRpnt = osst_do_scsi(SRpnt, STp, cmd, cmd[4], DMA_TO_DEVICE, STp->timeout, 0, 1);
	*aSRpnt = SRpnt;

	if ((STp->buffer)->syscall_result != 0) {
	    printk (KERN_ERR "%s:E: Couldn't set vendor name to %s\n", name, 
			(char *) ((STp->buffer)->b_data + MODE_HEADER_LENGTH + 2));
	    return (-EIO);
	}

	memset(cmd, 0, MAX_COMMAND_SIZE);
	cmd[0] = MODE_SENSE;
	cmd[1] = 8;
	cmd[2] = CAPABILITIES_PAGE;
	cmd[4] = CAPABILITIES_PAGE_LENGTH + MODE_HEADER_LENGTH;

	SRpnt = osst_do_scsi(SRpnt, STp, cmd, cmd[4], DMA_FROM_DEVICE, STp->timeout, 0, 1);
	*aSRpnt = SRpnt;

	if ((STp->buffer)->syscall_result != 0) {
	    printk (KERN_ERR "%s:E: Can't get capabilities page\n", name);
	    return (-EIO);
	}

	header = (osst_mode_parameter_header_t *) (STp->buffer)->b_data;
	cp     = (osst_capabilities_page_t    *) ((STp->buffer)->b_data +
		 sizeof(osst_mode_parameter_header_t) + header->bdl);

	drive_buffer_size = ntohs(cp->buffer_size) / 2;

	memset(cmd, 0, MAX_COMMAND_SIZE);
	cmd[0] = MODE_SENSE;
	cmd[1] = 8;
	cmd[2] = TAPE_PARAMTR_PAGE;
	cmd[4] = TAPE_PARAMTR_PAGE_LENGTH + MODE_HEADER_LENGTH;

	SRpnt = osst_do_scsi(SRpnt, STp, cmd, cmd[4], DMA_FROM_DEVICE, STp->timeout, 0, 1);
	*aSRpnt = SRpnt;

	if ((STp->buffer)->syscall_result != 0) {
	    printk (KERN_ERR "%s:E: Can't get tape parameter page\n", name);
	    return (-EIO);
	}

	header = (osst_mode_parameter_header_t *) (STp->buffer)->b_data;
	prm    = (osst_tape_paramtr_page_t    *) ((STp->buffer)->b_data +
		 sizeof(osst_mode_parameter_header_t) + header->bdl);

	STp->density  = prm->density;
	STp->capacity = ntohs(prm->segtrk) * ntohs(prm->trks);
#if DEBUG
	printk(OSST_DEB_MSG "%s:D: Density %d, tape length: %dMB, drive buffer size: %dKB\n",
			  name, STp->density, STp->capacity / 32, drive_buffer_size);
#endif

	return 0;
	
}


/* Step over EOF if it has been inadvertently crossed (ioctl not used because
   it messes up the block number). */
2772
static int cross_eof(struct osst_tape *STp, struct osst_request ** aSRpnt, int forward)
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{
	int	result;
	char  * name = tape_name(STp);

#if DEBUG
	if (debugging)
		printk(OSST_DEB_MSG "%s:D: Stepping over filemark %s.\n",
	   			  name, forward ? "forward" : "backward");
#endif

	if (forward) {
	   /* assumes that the filemark is already read by the drive, so this is low cost */
	   result = osst_space_over_filemarks_forward_slow(STp, aSRpnt, MTFSF, 1);
	}
	else
	   /* assumes this is only called if we just read the filemark! */
	   result = osst_seek_logical_blk(STp, aSRpnt, STp->logical_blk_num - 1);

	if (result < 0)
	   printk(KERN_WARNING "%s:W: Stepping over filemark %s failed.\n",
				name, forward ? "forward" : "backward");

	return result;
}


/* Get the tape position. */

2801
static int osst_get_frame_position(struct osst_tape *STp, struct osst_request ** aSRpnt)
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{
	unsigned char		scmd[MAX_COMMAND_SIZE];
2804
	struct osst_request   * SRpnt;
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	int			result = 0;
	char    	      * name   = tape_name(STp);

	/* KG: We want to be able to use it for checking Write Buffer availability
	 *  and thus don't want to risk to overwrite anything. Exchange buffers ... */
	char		mybuf[24];
	char	      * olddata = STp->buffer->b_data;
	int		oldsize = STp->buffer->buffer_size;

	if (STp->ready != ST_READY) return (-EIO);

	memset (scmd, 0, MAX_COMMAND_SIZE);
	scmd[0] = READ_POSITION;

	STp->buffer->b_data = mybuf; STp->buffer->buffer_size = 24;
	SRpnt = osst_do_scsi(*aSRpnt, STp, scmd, 20, DMA_FROM_DEVICE,
				      STp->timeout, MAX_RETRIES, 1);
	if (!SRpnt) {
		STp->buffer->b_data = olddata; STp->buffer->buffer_size = oldsize;
		return (-EBUSY);
	}
	*aSRpnt = SRpnt;

	if (STp->buffer->syscall_result)
2829
		result = ((SRpnt->sense[2] & 0x0f) == 3) ? -EIO : -EINVAL;	/* 3: Write Error */
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	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];
2836
			memcpy (mysense, SRpnt->sense, 16);
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			memset (scmd, 0, MAX_COMMAND_SIZE);
			scmd[0] = READ_POSITION;
			STp->buffer->b_data = mybuf; STp->buffer->buffer_size = 24;
			SRpnt = osst_do_scsi(SRpnt, STp, scmd, 20, DMA_FROM_DEVICE,
						    STp->timeout, MAX_RETRIES, 1);
#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:",
2845
					SRpnt->sense[2],SRpnt->sense[12],SRpnt->sense[13]);
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#endif
			if (!STp->buffer->syscall_result)
2848
				memcpy (SRpnt->sense, mysense, 16);
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			else
				printk(KERN_WARNING "%s:W: Double error in get position\n", name);
		}
		STp->first_frame_position = ((STp->buffer)->b_data[4] << 24)
					  + ((STp->buffer)->b_data[5] << 16)
					  + ((STp->buffer)->b_data[6] << 8)
					  +  (STp->buffer)->b_data[7];
		STp->last_frame_position  = ((STp->buffer)->b_data[ 8] << 24)
					  + ((STp->buffer)->b_data[ 9] << 16)
					  + ((STp->buffer)->b_data[10] <<  8)
					  +  (STp->buffer)->b_data[11];
		STp->cur_frames           =  (STp->buffer)->b_data[15];
#if DEBUG
		if (debugging) {
			printk(OSST_DEB_MSG "%s:D: Drive Positions: host %d, tape %d%s, buffer %d\n", name,
					    STp->first_frame_position, STp->last_frame_position,
					    ((STp->buffer)->b_data[0]&0x80)?" (BOP)":
					    ((STp->buffer)->b_data[0]&0x40)?" (EOP)":"",
					    STp->cur_frames);
		}
#endif
		if (STp->cur_frames == 0 && STp->first_frame_position != STp->last_frame_position) {
#if DEBUG
			printk(OSST_DEB_MSG "%s:D: Correcting read position %d, %d, %d\n", name,
					STp->first_frame_position, STp->last_frame_position, STp->cur_frames);
#endif
			STp->first_frame_position = STp->last_frame_position;
		}
	}
	STp->buffer->b_data = olddata; STp->buffer->buffer_size = oldsize;

	return (result == 0 ? STp->first_frame_position : result);
}


/* Set the tape block */
2885
static int osst_set_frame_position(struct osst_tape *STp, struct osst_request ** aSRpnt, int ppos, int skip)
L
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{
	unsigned char		scmd[MAX_COMMAND_SIZE];
2888
	struct osst_request   * SRpnt;
L
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	struct st_partstat    * STps;
	int			result = 0;
	int			pp     = (ppos == 3000 && !skip)? 0 : ppos;
	char		      * name   = tape_name(STp);

	if (STp->ready != ST_READY) return (-EIO);

	STps = &(STp->ps[STp->partition]);

	if (ppos < 0 || ppos > STp->capacity) {
		printk(KERN_WARNING "%s:W: Reposition request %d out of range\n", name, ppos);
		pp = ppos = ppos < 0 ? 0 : (STp->capacity - 1);
		result = (-EINVAL);
	}

	do {
#if DEBUG
		if (debugging)
			printk(OSST_DEB_MSG "%s:D: Setting ppos to %d.\n", name, pp);
#endif
		memset (scmd, 0, MAX_COMMAND_SIZE);
		scmd[0] = SEEK_10;
		scmd[1] = 1;
		scmd[3] = (pp >> 24);
		scmd[4] = (pp >> 16);
		scmd[5] = (pp >> 8);
		scmd[6] =  pp;
		if (skip)
			scmd[9] = 0x80;

		SRpnt = osst_do_scsi(*aSRpnt, STp, scmd, 0, DMA_NONE, STp->long_timeout,
								MAX_RETRIES, 1);
		if (!SRpnt)
			return (-EBUSY);
		*aSRpnt  = SRpnt;

		if ((STp->buffer)->syscall_result != 0) {
#if DEBUG
			printk(OSST_DEB_MSG "%s:D: SEEK command from %d to %d failed.\n",
					name, STp->first_frame_position, pp);
#endif
			result = (-EIO);
		}
		if (pp != ppos)
			osst_wait_ready(STp, aSRpnt, 5 * 60, OSST_WAIT_POSITION_COMPLETE);
	} while ((pp != ppos) && (pp = ppos));
	STp->first_frame_position = STp->last_frame_position = ppos;
	STps->eof = ST_NOEOF;
	STps->at_sm = 0;
	STps->rw = ST_IDLE;
	STp->frame_in_buffer = 0;
	return result;
}

2943
static int osst_write_trailer(struct osst_tape *STp, struct osst_request ** aSRpnt, int leave_at_EOT)
L
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{
	struct st_partstat * STps = &(STp->ps[STp->partition]);
	int result = 0;

	if (STp->write_type != OS_WRITE_NEW_MARK) {
		/* true unless the user wrote the filemark for us */
		result = osst_flush_drive_buffer(STp, aSRpnt);
		if (result < 0) goto out;
		result = osst_write_filemark(STp, aSRpnt);
		if (result < 0) goto out;

		if (STps->drv_file >= 0)
			STps->drv_file++ ;
		STps->drv_block = 0;
	}
	result = osst_write_eod(STp, aSRpnt);
	osst_write_header(STp, aSRpnt, leave_at_EOT);

	STps->eof = ST_FM;
out:
	return result;
}

/* osst versions of st functions - augmented and stripped to suit OnStream only */

/* Flush the write buffer (never need to write if variable blocksize). */
2970
static int osst_flush_write_buffer(struct osst_tape *STp, struct osst_request ** aSRpnt)
L
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{
	int			offset, transfer, blks = 0;
	int			result = 0;
	unsigned char		cmd[MAX_COMMAND_SIZE];
2975
	struct osst_request   * SRpnt = *aSRpnt;
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	struct st_partstat    * STps;
	char		      * name = tape_name(STp);

	if ((STp->buffer)->writing) {
		if (SRpnt == (STp->buffer)->last_SRpnt)
#if DEBUG
			{ printk(OSST_DEB_MSG
2983
	 "%s:D: aSRpnt points to osst_request that write_behind_check will release -- cleared\n", name);
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#endif
			*aSRpnt = SRpnt = NULL;
#if DEBUG
			} else if (SRpnt)
				printk(OSST_DEB_MSG
2989
	 "%s:D: aSRpnt does not point to osst_request that write_behind_check will release -- strange\n", name);
L
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#endif	
		osst_write_behind_check(STp);
		if ((STp->buffer)->syscall_result) {
#if DEBUG
			if (debugging)
				printk(OSST_DEB_MSG "%s:D: Async write error (flush) %x.\n",
				       name, (STp->buffer)->midlevel_result);
#endif
			if ((STp->buffer)->midlevel_result == INT_MAX)
				return (-ENOSPC);
			return (-EIO);
		}
	}

	result = 0;
	if (STp->dirty == 1) {

		STp->write_count++;
		STps     = &(STp->ps[STp->partition]);
		STps->rw = ST_WRITING;
		offset   = STp->buffer->buffer_bytes;
		blks     = (offset + STp->block_size - 1) / STp->block_size;
		transfer = OS_FRAME_SIZE;
		
		if (offset < OS_DATA_SIZE)
			osst_zero_buffer_tail(STp->buffer);

		if (STp->poll)
			if (osst_wait_frame (STp, aSRpnt, STp->first_frame_position, -50, 120))
				result = osst_recover_wait_frame(STp, aSRpnt, 1);

		memset(cmd, 0, MAX_COMMAND_SIZE);
		cmd[0] = WRITE_6;
		cmd[1] = 1;
		cmd[4] = 1;

		switch	(STp->write_type) {
		   case OS_WRITE_DATA:
#if DEBUG
   			if (debugging)
				printk(OSST_DEB_MSG "%s:D: Writing %d blocks to frame %d, lblks %d-%d\n",
					name, blks, STp->frame_seq_number, 
					STp->logical_blk_num - blks, STp->logical_blk_num - 1);
#endif
			osst_init_aux(STp, OS_FRAME_TYPE_DATA, STp->frame_seq_number++,
				      STp->logical_blk_num - blks, STp->block_size, blks);
			break;
		   case OS_WRITE_EOD:
			osst_init_aux(STp, OS_FRAME_TYPE_EOD, STp->frame_seq_number++,
				      STp->logical_blk_num, 0, 0);
			break;
		   case OS_WRITE_NEW_MARK:
			osst_init_aux(STp, OS_FRAME_TYPE_MARKER, STp->frame_seq_number++,
				      STp->logical_blk_num++, 0, blks=1);
			break;
		   case OS_WRITE_HEADER:
			osst_init_aux(STp, OS_FRAME_TYPE_HEADER, 0, 0, 0, blks=0);
			break;
		default: /* probably FILLER */
			osst_init_aux(STp, OS_FRAME_TYPE_FILL, 0, 0, 0, 0);
		}
#if DEBUG
		if (debugging)
			printk(OSST_DEB_MSG "%s:D: Flushing %d bytes, Transfering %d bytes in %d lblocks.\n",
			  			 name, offset, transfer, blks);
#endif

		SRpnt = osst_do_scsi(*aSRpnt, STp, cmd, transfer, DMA_TO_DEVICE,
					      STp->timeout, MAX_RETRIES, 1);
		*aSRpnt = SRpnt;
		if (!SRpnt)
			return (-EBUSY);

		if ((STp->buffer)->syscall_result != 0) {
#if DEBUG
			printk(OSST_DEB_MSG
				"%s:D: write sense [0]=0x%02x [2]=%02x [12]=%02x [13]=%02x\n",
3067 3068
				name, SRpnt->sense[0], SRpnt->sense[2],
				SRpnt->sense[12], SRpnt->sense[13]);
L
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#endif
3070 3071 3072
			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) {
L
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				STp->dirty = 0;
				(STp->buffer)->buffer_bytes = 0;
				result = (-ENOSPC);
			}
			else {
				if (osst_write_error_recovery(STp, aSRpnt, 1)) {
					printk(KERN_ERR "%s:E: Error on flush write.\n", name);
					result = (-EIO);
				}
			}
			STps->drv_block = (-1);		/* FIXME - even if write recovery succeeds? */
		}
		else {
			STp->first_frame_position++;
			STp->dirty = 0;
			(STp->buffer)->buffer_bytes = 0;
		}
	}
#if DEBUG
	printk(OSST_DEB_MSG "%s:D: Exit flush write buffer with code %d\n", name, result);
#endif
	return result;
}


/* Flush the tape buffer. The tape will be positioned correctly unless
   seek_next is true. */
3100
static int osst_flush_buffer(struct osst_tape * STp, struct osst_request ** aSRpnt, int seek_next)
L
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{
	struct st_partstat * STps;
	int    backspace = 0, result = 0;
#if DEBUG
	char * name = tape_name(STp);
#endif

	/*
	 * If there was a bus reset, block further access
	 * to this device.
	 */
	if( STp->pos_unknown)
		return (-EIO);

	if (STp->ready != ST_READY)
		return 0;

	STps = &(STp->ps[STp->partition]);
	if (STps->rw == ST_WRITING || STp->dirty) {	/* Writing */
		STp->write_type = OS_WRITE_DATA;
		return osst_flush_write_buffer(STp, aSRpnt);
	}
	if (STp->block_size == 0)
		return 0;

#if DEBUG
	printk(OSST_DEB_MSG "%s:D: Reached flush (read) buffer\n", name);
#endif

	if (!STp->can_bsr) {
		backspace = ((STp->buffer)->buffer_bytes + (STp->buffer)->read_pointer) / STp->block_size -
			    ((STp->buffer)->read_pointer + STp->block_size - 1        ) / STp->block_size ;
		(STp->buffer)->buffer_bytes = 0;
		(STp->buffer)->read_pointer = 0;
		STp->frame_in_buffer = 0;		/* FIXME is this relevant w. OSST? */
	}

	if (!seek_next) {
		if (STps->eof == ST_FM_HIT) {
			result = cross_eof(STp, aSRpnt, 0); /* Back over the EOF hit */
			if (!result)
				STps->eof = ST_NOEOF;
			else {
				if (STps->drv_file >= 0)
					STps->drv_file++;
				STps->drv_block = 0;
			}
		}
		if (!result && backspace > 0)	/* TODO -- design and run a test case for this */
			result = osst_seek_logical_blk(STp, aSRpnt, STp->logical_blk_num - backspace);
	}
	else if (STps->eof == ST_FM_HIT) {
		if (STps->drv_file >= 0)
			STps->drv_file++;
		STps->drv_block = 0;
		STps->eof = ST_NOEOF;
	}

	return result;
}

3162
static int osst_write_frame(struct osst_tape * STp, struct osst_request ** aSRpnt, int synchronous)
L
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3163 3164
{
	unsigned char		cmd[MAX_COMMAND_SIZE];
3165
	struct osst_request   * SRpnt;
L
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3166 3167 3168 3169 3170 3171 3172 3173 3174 3175 3176 3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187 3188 3189 3190 3191 3192 3193 3194 3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213 3214 3215 3216 3217 3218 3219 3220 3221 3222 3223 3224 3225
	int			blks;
#if DEBUG
	char		      * name = tape_name(STp);
#endif

	if ((!STp-> raw) && (STp->first_frame_position == 0xbae)) { /* _must_ preserve buffer! */
#if DEBUG
		printk(OSST_DEB_MSG "%s:D: Reaching config partition.\n", name);
#endif
		if (osst_flush_drive_buffer(STp, aSRpnt) < 0) {
			return (-EIO);
		}
		/* error recovery may have bumped us past the header partition */
		if (osst_get_frame_position(STp, aSRpnt) < 0xbb8) {
#if DEBUG
			printk(OSST_DEB_MSG "%s:D: Skipping over config partition.\n", name);
#endif
		osst_position_tape_and_confirm(STp, aSRpnt, 0xbb8);
		}
	}

	if (STp->poll)
		if (osst_wait_frame (STp, aSRpnt, STp->first_frame_position, -48, 120))
			if (osst_recover_wait_frame(STp, aSRpnt, 1))
				return (-EIO);

//	osst_build_stats(STp, &SRpnt);

	STp->ps[STp->partition].rw = ST_WRITING;
	STp->write_type            = OS_WRITE_DATA;
			
	memset(cmd, 0, MAX_COMMAND_SIZE);
	cmd[0]   = WRITE_6;
	cmd[1]   = 1;
	cmd[4]   = 1;						/* one frame at a time... */
	blks     = STp->buffer->buffer_bytes / STp->block_size;
#if DEBUG
	if (debugging)
		printk(OSST_DEB_MSG "%s:D: Writing %d blocks to frame %d, lblks %d-%d\n", name, blks, 
			STp->frame_seq_number, STp->logical_blk_num - blks, STp->logical_blk_num - 1);
#endif
	osst_init_aux(STp, OS_FRAME_TYPE_DATA, STp->frame_seq_number++,
		      STp->logical_blk_num - blks, STp->block_size, blks);

#if DEBUG
	if (!synchronous)
		STp->write_pending = 1;
#endif
	SRpnt = osst_do_scsi(*aSRpnt, STp, cmd, OS_FRAME_SIZE, DMA_TO_DEVICE, STp->timeout,
									MAX_RETRIES, synchronous);
	if (!SRpnt)
		return (-EBUSY);
	*aSRpnt = SRpnt;

	if (synchronous) {
		if (STp->buffer->syscall_result != 0) {
#if DEBUG
			if (debugging)
				printk(OSST_DEB_MSG "%s:D: Error on write:\n", name);
#endif
3226 3227 3228
			if ((SRpnt->sense[0] & 0x70) == 0x70 &&
			    (SRpnt->sense[2] & 0x40)) {
				if ((SRpnt->sense[2] & 0x0f) == VOLUME_OVERFLOW)
L
Linus Torvalds 已提交
3229 3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242 3243 3244
					return (-ENOSPC);
			}
			else {
				if (osst_write_error_recovery(STp, aSRpnt, 1))
					return (-EIO);
			}
		}
		else
			STp->first_frame_position++;
	}

	STp->write_count++;

	return 0;
}

3245
/* Lock or unlock the drive door. Don't use when struct osst_request allocated. */
L
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3246 3247 3248 3249 3250 3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269 3270 3271 3272 3273 3274 3275 3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286 3287 3288 3289 3290 3291 3292
static int do_door_lock(struct osst_tape * STp, int do_lock)
{
	int retval, cmd;

	cmd = do_lock ? SCSI_IOCTL_DOORLOCK : SCSI_IOCTL_DOORUNLOCK;
#if DEBUG
	printk(OSST_DEB_MSG "%s:D: %socking drive door.\n", tape_name(STp), do_lock ? "L" : "Unl");
#endif
	retval = scsi_ioctl(STp->device, cmd, NULL);
	if (!retval) {
		STp->door_locked = do_lock ? ST_LOCKED_EXPLICIT : ST_UNLOCKED;
	}
	else {
		STp->door_locked = ST_LOCK_FAILS;
	}
	return retval;
}

/* Set the internal state after reset */
static void reset_state(struct osst_tape *STp)
{
	int i;
	struct st_partstat *STps;

	STp->pos_unknown = 0;
	for (i = 0; i < ST_NBR_PARTITIONS; i++) {
		STps = &(STp->ps[i]);
		STps->rw = ST_IDLE;
		STps->eof = ST_NOEOF;
		STps->at_sm = 0;
		STps->last_block_valid = 0;
		STps->drv_block = -1;
		STps->drv_file = -1;
	}
}
				

/* Entry points to osst */

/* Write command */
static ssize_t osst_write(struct file * filp, const char __user * buf, size_t count, loff_t *ppos)
{
	ssize_t		      total, retval = 0;
	ssize_t		      i, do_count, blks, transfer;
	int		      write_threshold;
	int		      doing_write = 0;
	const char   __user * b_point;
3293
	struct osst_request * SRpnt = NULL;
L
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3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306 3307 3308 3309 3310 3311 3312 3313 3314 3315 3316 3317 3318 3319 3320 3321 3322 3323 3324 3325 3326 3327 3328 3329 3330 3331 3332 3333 3334 3335 3336 3337 3338 3339 3340 3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 3391 3392 3393 3394 3395 3396 3397 3398 3399 3400 3401 3402 3403 3404 3405 3406 3407 3408 3409 3410 3411 3412 3413 3414 3415 3416 3417 3418 3419 3420 3421 3422 3423 3424 3425 3426 3427 3428 3429 3430 3431 3432 3433 3434 3435 3436 3437 3438 3439 3440 3441 3442 3443 3444 3445 3446 3447 3448 3449 3450 3451 3452 3453 3454 3455 3456 3457 3458 3459 3460 3461 3462 3463 3464 3465 3466 3467 3468 3469 3470 3471 3472 3473 3474 3475 3476 3477 3478 3479 3480 3481 3482 3483
	struct st_modedef   * STm;
	struct st_partstat  * STps;
	struct osst_tape    * STp  = filp->private_data;
	char		    * name = tape_name(STp);


	if (down_interruptible(&STp->lock))
		return (-ERESTARTSYS);

	/*
	 * If we are in the middle of error recovery, don't let anyone
	 * else try and use this device.  Also, if error recovery fails, it
	 * may try and take the device offline, in which case all further
	 * access to the device is prohibited.
	 */
	if( !scsi_block_when_processing_errors(STp->device) ) {
		retval = (-ENXIO);
		goto out;
	}
	
	if (STp->ready != ST_READY) {
		if (STp->ready == ST_NO_TAPE)
			retval = (-ENOMEDIUM);
		else
			retval = (-EIO);
		goto out;
	}
	STm = &(STp->modes[STp->current_mode]);
	if (!STm->defined) {
		retval = (-ENXIO);
		goto out;
	}
	if (count == 0)
		goto out;

	/*
	 * If there was a bus reset, block further access
	 * to this device.
	 */
	if (STp->pos_unknown) {
		retval = (-EIO);
		goto out;
	}

#if DEBUG
	if (!STp->in_use) {
		printk(OSST_DEB_MSG "%s:D: Incorrect device.\n", name);
		retval = (-EIO);
		goto out;
	}
#endif

	if (STp->write_prot) {
		retval = (-EACCES);
		goto out;
	}

	/* Write must be integral number of blocks */
	if (STp->block_size != 0 && (count % STp->block_size) != 0) {
		printk(KERN_ERR "%s:E: Write (%Zd bytes) not multiple of tape block size (%d%c).\n",
				       name, count, STp->block_size<1024?
				       STp->block_size:STp->block_size/1024, STp->block_size<1024?'b':'k');
		retval = (-EINVAL);
		goto out;
	}

	if (STp->first_frame_position >= STp->capacity - OSST_EOM_RESERVE) {
		printk(KERN_ERR "%s:E: Write truncated at EOM early warning (frame %d).\n",
				       name, STp->first_frame_position);
		retval = (-ENOSPC);
		goto out;
	}

	if (STp->do_auto_lock && STp->door_locked == ST_UNLOCKED && !do_door_lock(STp, 1))
		STp->door_locked = ST_LOCKED_AUTO;

	STps = &(STp->ps[STp->partition]);

	if (STps->rw == ST_READING) {
#if DEBUG
		printk(OSST_DEB_MSG "%s:D: Switching from read to write at file %d, block %d\n", name, 
					STps->drv_file, STps->drv_block);
#endif
		retval = osst_flush_buffer(STp, &SRpnt, 0);
		if (retval)
			goto out;
		STps->rw = ST_IDLE;
	}
	if (STps->rw != ST_WRITING) {
		/* Are we totally rewriting this tape? */
		if (!STp->header_ok ||
		    (STp->first_frame_position == STp->first_data_ppos && STps->drv_block < 0) ||
		    (STps->drv_file == 0 && STps->drv_block == 0)) {
			STp->wrt_pass_cntr++;
#if DEBUG
			printk(OSST_DEB_MSG "%s:D: Allocating next write pass counter: %d\n",
						  name, STp->wrt_pass_cntr);
#endif
			osst_reset_header(STp, &SRpnt);
			STps->drv_file = STps->drv_block = 0;
		}
		/* Do we know where we'll be writing on the tape? */
		else {
			if ((STp->fast_open && osst_verify_position(STp, &SRpnt)) ||
			  		STps->drv_file < 0 || STps->drv_block < 0) {
				if (STp->first_frame_position == STp->eod_frame_ppos) {	/* at EOD */
			  		STps->drv_file = STp->filemark_cnt;
			  		STps->drv_block = 0;
				}
				else {
					/* We have no idea where the tape is positioned - give up */
#if DEBUG
					printk(OSST_DEB_MSG
						"%s:D: Cannot write at indeterminate position.\n", name);
#endif
					retval = (-EIO);
					goto out;
				}
      			}	  
			if ((STps->drv_file + STps->drv_block) > 0 && STps->drv_file < STp->filemark_cnt) {
				STp->filemark_cnt = STps->drv_file;
				STp->last_mark_ppos =
				       	ntohl(STp->header_cache->dat_fm_tab.fm_tab_ent[STp->filemark_cnt-1]);
				printk(KERN_WARNING
					"%s:W: Overwriting file %d with old write pass counter %d\n",
						name, STps->drv_file, STp->wrt_pass_cntr);
				printk(KERN_WARNING
					"%s:W: may lead to stale data being accepted on reading back!\n",
						name);
#if DEBUG
				printk(OSST_DEB_MSG
				  "%s:D: resetting filemark count to %d and last mark ppos,lbn to %d,%d\n",
					name, STp->filemark_cnt, STp->last_mark_ppos, STp->last_mark_lbn);
#endif
			}
		}
		STp->fast_open = 0;
	}
	if (!STp->header_ok) {
#if DEBUG
		printk(OSST_DEB_MSG "%s:D: Write cannot proceed without valid headers\n", name);
#endif
		retval = (-EIO);
		goto out;
	}

	if ((STp->buffer)->writing) {
if (SRpnt) printk(KERN_ERR "%s:A: Not supposed to have SRpnt at line %d\n", name, __LINE__);
		osst_write_behind_check(STp);
		if ((STp->buffer)->syscall_result) {
#if DEBUG
		if (debugging)
			printk(OSST_DEB_MSG "%s:D: Async write error (write) %x.\n", name,
						 (STp->buffer)->midlevel_result);
#endif
		if ((STp->buffer)->midlevel_result == INT_MAX)
			STps->eof = ST_EOM_OK;
		else
			STps->eof = ST_EOM_ERROR;
		}
	}
	if (STps->eof == ST_EOM_OK) {
		retval = (-ENOSPC);
		goto out;
	}
	else if (STps->eof == ST_EOM_ERROR) {
		retval = (-EIO);
		goto out;
	}

	/* Check the buffer readability in cases where copy_user might catch
		 the problems after some tape movement. */
	if ((copy_from_user(&i, buf, 1) != 0 ||
	     copy_from_user(&i, buf + count - 1, 1) != 0)) {
		retval = (-EFAULT);
		goto out;
	}

	if (!STm->do_buffer_writes) {
		write_threshold = 1;
	}
	else
		write_threshold = (STp->buffer)->buffer_blocks * STp->block_size;
	if (!STm->do_async_writes)
		write_threshold--;

	total = count;
#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",
3484
				name, (int) count, STps->drv_file, STps->drv_block,
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				STp->logical_blk_num, STp->frame_seq_number, STp->first_frame_position);
#endif
	b_point = buf;
	while ((STp->buffer)->buffer_bytes + count > write_threshold)
	{
		doing_write = 1;
		do_count = (STp->buffer)->buffer_blocks * STp->block_size -
			   (STp->buffer)->buffer_bytes;
		if (do_count > count)
			do_count = count;

		i = append_to_buffer(b_point, STp->buffer, do_count);
		if (i) {
			retval = i;
			goto out;
		}

		blks = do_count / STp->block_size;
		STp->logical_blk_num += blks;  /* logical_blk_num is incremented as data is moved from user */
  
		i = osst_write_frame(STp, &SRpnt, 1);

		if (i == (-ENOSPC)) {
			transfer = STp->buffer->writing;	/* FIXME -- check this logic */
			if (transfer <= do_count) {
				filp->f_pos += do_count - transfer;
				count -= do_count - transfer;
				if (STps->drv_block >= 0) {
					STps->drv_block += (do_count - transfer) / STp->block_size;
				}
				STps->eof = ST_EOM_OK;
				retval = (-ENOSPC);		/* EOM within current request */
#if DEBUG
				if (debugging)
				      printk(OSST_DEB_MSG "%s:D: EOM with %d bytes unwritten.\n",
3520
							     name, (int) transfer);
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#endif
			}
			else {
				STps->eof = ST_EOM_ERROR;
				STps->drv_block = (-1);		/* Too cautious? */
				retval = (-EIO);		/* EOM for old data */
#if DEBUG
				if (debugging)
				      printk(OSST_DEB_MSG "%s:D: EOM with lost data.\n", name);
#endif
			}
		}
		else
			retval = i;
			
		if (retval < 0) {
			if (SRpnt != NULL) {
3538
				osst_release_request(SRpnt);
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				SRpnt = NULL;
			}
			STp->buffer->buffer_bytes = 0;
			STp->dirty = 0;
			if (count < total)
				retval = total - count;
			goto out;
		}

		filp->f_pos += do_count;
		b_point += do_count;
		count -= do_count;
		if (STps->drv_block >= 0) {
			STps->drv_block += blks;
		}
		STp->buffer->buffer_bytes = 0;
		STp->dirty = 0;
	}  /* end while write threshold exceeded */

	if (count != 0) {
		STp->dirty = 1;
		i = append_to_buffer(b_point, STp->buffer, count);
		if (i) {
			retval = i;
			goto out;
		}
		blks = count / STp->block_size;
		STp->logical_blk_num += blks;
		if (STps->drv_block >= 0) {
			STps->drv_block += blks;
		}
		filp->f_pos += count;
		count = 0;
	}

	if (doing_write && (STp->buffer)->syscall_result != 0) {
		retval = (STp->buffer)->syscall_result;
		goto out;
	}

	if (STm->do_async_writes && ((STp->buffer)->buffer_bytes >= STp->write_threshold)) { 
		/* Schedule an asynchronous write */
		(STp->buffer)->writing = ((STp->buffer)->buffer_bytes /
					   STp->block_size) * STp->block_size;
		STp->dirty = !((STp->buffer)->writing ==
				          (STp->buffer)->buffer_bytes);

		i = osst_write_frame(STp, &SRpnt, 0);
		if (i < 0) {
			retval = (-EIO);
			goto out;
		}
		SRpnt = NULL;			/* Prevent releasing this request! */
	}
	STps->at_sm &= (total == 0);
	if (total > 0)
		STps->eof = ST_NOEOF;

	retval = total;

out:
3600
	if (SRpnt != NULL) osst_release_request(SRpnt);
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	up(&STp->lock);

	return retval;
}


/* Read command */
static ssize_t osst_read(struct file * filp, char __user * buf, size_t count, loff_t *ppos)
{
	ssize_t		      total, retval = 0;
	ssize_t		      i, transfer;
	int		      special;
	struct st_modedef   * STm;
	struct st_partstat  * STps;
3616
	struct osst_request * SRpnt = NULL;
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	struct osst_tape    * STp   = filp->private_data;
	char		    * name  = tape_name(STp);


	if (down_interruptible(&STp->lock))
		return (-ERESTARTSYS);

	/*
	 * If we are in the middle of error recovery, don't let anyone
	 * else try and use this device.  Also, if error recovery fails, it
	 * may try and take the device offline, in which case all further
	 * access to the device is prohibited.
	 */
	if( !scsi_block_when_processing_errors(STp->device) ) {
		retval = (-ENXIO);
		goto out;
	}
	
	if (STp->ready != ST_READY) {
		if (STp->ready == ST_NO_TAPE)
			retval = (-ENOMEDIUM);
		else
			retval = (-EIO);
		goto out;
	}
	STm = &(STp->modes[STp->current_mode]);
	if (!STm->defined) {
		retval = (-ENXIO);
		goto out;
	}
#if DEBUG
	if (!STp->in_use) {
		printk(OSST_DEB_MSG "%s:D: Incorrect device.\n", name);
		retval = (-EIO);
		goto out;
	}
#endif
	/* Must have initialized medium */
	if (!STp->header_ok) {
		retval = (-EIO);
		goto out;
	}

	if (STp->do_auto_lock && STp->door_locked == ST_UNLOCKED && !do_door_lock(STp, 1))
		STp->door_locked = ST_LOCKED_AUTO;

	STps = &(STp->ps[STp->partition]);
	if (STps->rw == ST_WRITING) {
		retval = osst_flush_buffer(STp, &SRpnt, 0);
		if (retval)
			goto out;
		STps->rw = ST_IDLE;
		/* FIXME -- this may leave the tape without EOD and up2date headers */
	}

	if ((count % STp->block_size) != 0) {
		printk(KERN_WARNING
		    "%s:W: Read (%Zd bytes) not multiple of tape block size (%d%c).\n", name, count,
		    STp->block_size<1024?STp->block_size:STp->block_size/1024, STp->block_size<1024?'b':'k');
	}

#if DEBUG
	if (debugging && STps->eof != ST_NOEOF)
		printk(OSST_DEB_MSG "%s:D: EOF/EOM flag up (%d). Bytes %d\n", name,
				     STps->eof, (STp->buffer)->buffer_bytes);
#endif
	if ((STp->buffer)->buffer_bytes == 0 &&
	     STps->eof >= ST_EOD_1) {
		if (STps->eof < ST_EOD) {
			STps->eof += 1;
			retval = 0;
			goto out;
		}
		retval = (-EIO);  /* EOM or Blank Check */
		goto out;
	}

	/* Check the buffer writability before any tape movement. Don't alter
		 buffer data. */
	if (copy_from_user(&i, buf, 1)             != 0 ||
	    copy_to_user  (buf, &i, 1)             != 0 ||
	    copy_from_user(&i, buf + count - 1, 1) != 0 ||
	    copy_to_user  (buf + count - 1, &i, 1) != 0) {
		retval = (-EFAULT);
		goto out;
	}

	/* Loop until enough data in buffer or a special condition found */
	for (total = 0, special = 0; total < count - STp->block_size + 1 && !special; ) {

		/* Get new data if the buffer is empty */
		if ((STp->buffer)->buffer_bytes == 0) {
			if (STps->eof == ST_FM_HIT)
				break;
			special = osst_get_logical_frame(STp, &SRpnt, STp->frame_seq_number, 0);
			if (special < 0) { 			/* No need to continue read */
				STp->frame_in_buffer = 0;
				retval = special;
				goto out;
			}
		}

		/* Move the data from driver buffer to user buffer */
		if ((STp->buffer)->buffer_bytes > 0) {
#if DEBUG
			if (debugging && STps->eof != ST_NOEOF)
			    printk(OSST_DEB_MSG "%s:D: EOF up (%d). Left %d, needed %d.\n", name,
3724
						 STps->eof, (STp->buffer)->buffer_bytes, (int) (count - total));
L
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#endif
		       	/* force multiple of block size, note block_size may have been adjusted */
			transfer = (((STp->buffer)->buffer_bytes < count - total ?
				     (STp->buffer)->buffer_bytes : count - total)/
					STp->block_size) * STp->block_size;

			if (transfer == 0) {
				printk(KERN_WARNING
				  "%s:W: Nothing can be transfered, requested %Zd, tape block size (%d%c).\n",
			   		name, count, STp->block_size < 1024?
					STp->block_size:STp->block_size/1024,
				       	STp->block_size<1024?'b':'k');
				break;
			}
			i = from_buffer(STp->buffer, buf, transfer);
			if (i)  {
				retval = i;
				goto out;
			}
			STp->logical_blk_num += transfer / STp->block_size;
			STps->drv_block      += transfer / STp->block_size;
			filp->f_pos          += transfer;
			buf                  += transfer;
			total                += transfer;
		}
 
		if ((STp->buffer)->buffer_bytes == 0) {
#if DEBUG
			if (debugging)
				printk(OSST_DEB_MSG "%s:D: Finished with frame %d\n",
					       	name, STp->frame_seq_number);
#endif
			STp->frame_in_buffer = 0;
			STp->frame_seq_number++;              /* frame to look for next time */
		}
	} /* for (total = 0, special = 0; total < count && !special; ) */

	/* Change the eof state if no data from tape or buffer */
	if (total == 0) {
		if (STps->eof == ST_FM_HIT) {
			STps->eof = (STp->first_frame_position >= STp->eod_frame_ppos)?ST_EOD_2:ST_FM;
			STps->drv_block = 0;
			if (STps->drv_file >= 0)
				STps->drv_file++;
		}
		else if (STps->eof == ST_EOD_1) {
			STps->eof = ST_EOD_2;
			if (STps->drv_block > 0 && STps->drv_file >= 0)
				STps->drv_file++;
			STps->drv_block = 0;
		}
		else if (STps->eof == ST_EOD_2)
			STps->eof = ST_EOD;
	}
	else if (STps->eof == ST_FM)
		STps->eof = ST_NOEOF;

	retval = total;

out:
3785
	if (SRpnt != NULL) osst_release_request(SRpnt);
L
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	up(&STp->lock);

	return retval;
}


/* Set the driver options */
static void osst_log_options(struct osst_tape *STp, struct st_modedef *STm, char *name)
{
  printk(KERN_INFO
"%s:I: Mode %d options: buffer writes: %d, async writes: %d, read ahead: %d\n",
	 name, STp->current_mode, STm->do_buffer_writes, STm->do_async_writes,
	 STm->do_read_ahead);
  printk(KERN_INFO
"%s:I:    can bsr: %d, two FMs: %d, fast mteom: %d, auto lock: %d,\n",
	 name, STp->can_bsr, STp->two_fm, STp->fast_mteom, STp->do_auto_lock);
  printk(KERN_INFO
"%s:I:    defs for wr: %d, no block limits: %d, partitions: %d, s2 log: %d\n",
	 name, STm->defaults_for_writes, STp->omit_blklims, STp->can_partitions,
	 STp->scsi2_logical);
  printk(KERN_INFO
"%s:I:    sysv: %d\n", name, STm->sysv);
#if DEBUG
  printk(KERN_INFO
	 "%s:D:    debugging: %d\n",
	 name, debugging);
#endif
}


static int osst_set_options(struct osst_tape *STp, long options)
{
	int		    value;
	long		    code;
	struct st_modedef * STm;
	char		  * name = tape_name(STp);

	STm = &(STp->modes[STp->current_mode]);
	if (!STm->defined) {
		memcpy(STm, &(STp->modes[0]), sizeof(*STm));
		modes_defined = 1;
#if DEBUG
		if (debugging)
			printk(OSST_DEB_MSG "%s:D: Initialized mode %d definition from mode 0\n",
					     name, STp->current_mode);
#endif
	}

	code = options & MT_ST_OPTIONS;
	if (code == MT_ST_BOOLEANS) {
		STm->do_buffer_writes = (options & MT_ST_BUFFER_WRITES) != 0;
		STm->do_async_writes  = (options & MT_ST_ASYNC_WRITES) != 0;
		STm->defaults_for_writes = (options & MT_ST_DEF_WRITES) != 0;
		STm->do_read_ahead    = (options & MT_ST_READ_AHEAD) != 0;
		STp->two_fm	      = (options & MT_ST_TWO_FM) != 0;
		STp->fast_mteom	      = (options & MT_ST_FAST_MTEOM) != 0;
		STp->do_auto_lock     = (options & MT_ST_AUTO_LOCK) != 0;
		STp->can_bsr          = (options & MT_ST_CAN_BSR) != 0;
		STp->omit_blklims     = (options & MT_ST_NO_BLKLIMS) != 0;
		if ((STp->device)->scsi_level >= SCSI_2)
			STp->can_partitions = (options & MT_ST_CAN_PARTITIONS) != 0;
		STp->scsi2_logical    = (options & MT_ST_SCSI2LOGICAL) != 0;
		STm->sysv	      = (options & MT_ST_SYSV) != 0;
#if DEBUG
		debugging = (options & MT_ST_DEBUGGING) != 0;
#endif
		osst_log_options(STp, STm, name);
	}
	else if (code == MT_ST_SETBOOLEANS || code == MT_ST_CLEARBOOLEANS) {
		value = (code == MT_ST_SETBOOLEANS);
		if ((options & MT_ST_BUFFER_WRITES) != 0)
			STm->do_buffer_writes = value;
		if ((options & MT_ST_ASYNC_WRITES) != 0)
			STm->do_async_writes = value;
		if ((options & MT_ST_DEF_WRITES) != 0)
			STm->defaults_for_writes = value;
		if ((options & MT_ST_READ_AHEAD) != 0)
			STm->do_read_ahead = value;
		if ((options & MT_ST_TWO_FM) != 0)
			STp->two_fm = value;
		if ((options & MT_ST_FAST_MTEOM) != 0)
			STp->fast_mteom = value;
		if ((options & MT_ST_AUTO_LOCK) != 0)
			STp->do_auto_lock = value;
		if ((options & MT_ST_CAN_BSR) != 0)
			STp->can_bsr = value;
		if ((options & MT_ST_NO_BLKLIMS) != 0)
			STp->omit_blklims = value;
		if ((STp->device)->scsi_level >= SCSI_2 &&
		    (options & MT_ST_CAN_PARTITIONS) != 0)
			STp->can_partitions = value;
		if ((options & MT_ST_SCSI2LOGICAL) != 0)
			STp->scsi2_logical = value;
		if ((options & MT_ST_SYSV) != 0)
			STm->sysv = value;
#if DEBUG
		if ((options & MT_ST_DEBUGGING) != 0)
			debugging = value;
#endif
		osst_log_options(STp, STm, name);
	}
	else if (code == MT_ST_WRITE_THRESHOLD) {
		value = (options & ~MT_ST_OPTIONS) * ST_KILOBYTE;
		if (value < 1 || value > osst_buffer_size) {
			printk(KERN_WARNING "%s:W: Write threshold %d too small or too large.\n",
					     name, value);
			return (-EIO);
		}
		STp->write_threshold = value;
		printk(KERN_INFO "%s:I: Write threshold set to %d bytes.\n",
				  name, value);
	}
	else if (code == MT_ST_DEF_BLKSIZE) {
		value = (options & ~MT_ST_OPTIONS);
		if (value == ~MT_ST_OPTIONS) {
			STm->default_blksize = (-1);
			printk(KERN_INFO "%s:I: Default block size disabled.\n", name);
		}
		else {
			if (value < 512 || value > OS_DATA_SIZE || OS_DATA_SIZE % value) {
				printk(KERN_WARNING "%s:W: Default block size cannot be set to %d.\n",
							 name, value);
				return (-EINVAL);
			}
			STm->default_blksize = value;
			printk(KERN_INFO "%s:I: Default block size set to %d bytes.\n",
					  name, STm->default_blksize);
		}
	}
	else if (code == MT_ST_TIMEOUTS) {
		value = (options & ~MT_ST_OPTIONS);
		if ((value & MT_ST_SET_LONG_TIMEOUT) != 0) {
			STp->long_timeout = (value & ~MT_ST_SET_LONG_TIMEOUT) * HZ;
			printk(KERN_INFO "%s:I: Long timeout set to %d seconds.\n", name,
					     (value & ~MT_ST_SET_LONG_TIMEOUT));
		}
		else {
			STp->timeout = value * HZ;
			printk(KERN_INFO "%s:I: Normal timeout set to %d seconds.\n", name, value);
		}
	}
	else if (code == MT_ST_DEF_OPTIONS) {
		code = (options & ~MT_ST_CLEAR_DEFAULT);
		value = (options & MT_ST_CLEAR_DEFAULT);
		if (code == MT_ST_DEF_DENSITY) {
			if (value == MT_ST_CLEAR_DEFAULT) {
				STm->default_density = (-1);
				printk(KERN_INFO "%s:I: Density default disabled.\n", name);
			}
			else {
				STm->default_density = value & 0xff;
				printk(KERN_INFO "%s:I: Density default set to %x\n",
						  name, STm->default_density);
			}
		}
		else if (code == MT_ST_DEF_DRVBUFFER) {
			if (value == MT_ST_CLEAR_DEFAULT) {
				STp->default_drvbuffer = 0xff;
				printk(KERN_INFO "%s:I: Drive buffer default disabled.\n", name);
			}
			else {
				STp->default_drvbuffer = value & 7;
				printk(KERN_INFO "%s:I: Drive buffer default set to %x\n",
						  name, STp->default_drvbuffer);
			}
		}
		else if (code == MT_ST_DEF_COMPRESSION) {
			if (value == MT_ST_CLEAR_DEFAULT) {
				STm->default_compression = ST_DONT_TOUCH;
				printk(KERN_INFO "%s:I: Compression default disabled.\n", name);
			}
			else {
				STm->default_compression = (value & 1 ? ST_YES : ST_NO);
				printk(KERN_INFO "%s:I: Compression default set to %x\n",
						  name, (value & 1));
			}
		}
	}
	else
		return (-EIO);

	return 0;
}


/* Internal ioctl function */
3973
static int osst_int_ioctl(struct osst_tape * STp, struct osst_request ** aSRpnt,
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			     unsigned int cmd_in, unsigned long arg)
{
	int			timeout;
	long			ltmp;
	int			i, ioctl_result;
	int			chg_eof = 1;
	unsigned char		cmd[MAX_COMMAND_SIZE];
3981
	struct osst_request   * SRpnt = * aSRpnt;
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	struct st_partstat    * STps;
	int			fileno, blkno, at_sm, frame_seq_numbr, logical_blk_num;
	int			datalen = 0, direction = DMA_NONE;
	char		      * name = tape_name(STp);

	if (STp->ready != ST_READY && cmd_in != MTLOAD) {
		if (STp->ready == ST_NO_TAPE)
			return (-ENOMEDIUM);
		else
			return (-EIO);
	}
	timeout = STp->long_timeout;
	STps = &(STp->ps[STp->partition]);
	fileno = STps->drv_file;
	blkno = STps->drv_block;
	at_sm = STps->at_sm;
	frame_seq_numbr = STp->frame_seq_number;
	logical_blk_num = STp->logical_blk_num;

	memset(cmd, 0, MAX_COMMAND_SIZE);
	switch (cmd_in) {
	 case MTFSFM:
		chg_eof = 0; /* Changed from the FSF after this */
	 case MTFSF:
		if (STp->raw)
		   return (-EIO);
		if (STp->linux_media)
		   ioctl_result = osst_space_over_filemarks_forward_fast(STp, &SRpnt, cmd_in, arg);
		else
		   ioctl_result = osst_space_over_filemarks_forward_slow(STp, &SRpnt, cmd_in, arg);
		if (fileno >= 0)
		   fileno += arg;
		blkno = 0;
		at_sm &= (arg == 0);
		goto os_bypass;

	 case MTBSF:
		chg_eof = 0; /* Changed from the FSF after this */
	 case MTBSFM:
		if (STp->raw)
		   return (-EIO);
		ioctl_result = osst_space_over_filemarks_backward(STp, &SRpnt, cmd_in, arg);
		if (fileno >= 0)
		   fileno -= arg;
		blkno = (-1);  /* We can't know the block number */
		at_sm &= (arg == 0);
		goto os_bypass;

	 case MTFSR:
	 case MTBSR:
#if DEBUG
		if (debugging)
		   printk(OSST_DEB_MSG "%s:D: Skipping %lu blocks %s from logical block %d\n",
				name, arg, cmd_in==MTFSR?"forward":"backward", logical_blk_num);
#endif
		if (cmd_in == MTFSR) {
		   logical_blk_num += arg;
		   if (blkno >= 0) blkno += arg;
		}
		else {
		   logical_blk_num -= arg;
		   if (blkno >= 0) blkno -= arg;
		}
		ioctl_result = osst_seek_logical_blk(STp, &SRpnt, logical_blk_num);
		fileno = STps->drv_file;
		blkno  = STps->drv_block;
		at_sm &= (arg == 0);
		goto os_bypass;

	 case MTFSS:
		cmd[0] = SPACE;
		cmd[1] = 0x04; /* Space Setmarks */   /* FIXME -- OS can't do this? */
		cmd[2] = (arg >> 16);
		cmd[3] = (arg >> 8);
		cmd[4] = arg;
#if DEBUG
		if (debugging)
			printk(OSST_DEB_MSG "%s:D: Spacing tape forward %d setmarks.\n", name,
		cmd[2] * 65536 + cmd[3] * 256 + cmd[4]);
#endif
		if (arg != 0) {
			blkno = fileno = (-1);
			at_sm = 1;
		}
		break;
	 case MTBSS:
		cmd[0] = SPACE;
		cmd[1] = 0x04; /* Space Setmarks */   /* FIXME -- OS can't do this? */
		ltmp = (-arg);
		cmd[2] = (ltmp >> 16);
		cmd[3] = (ltmp >> 8);
		cmd[4] = ltmp;
#if DEBUG
		if (debugging) {
			if (cmd[2] & 0x80)
			   ltmp = 0xff000000;
			ltmp = ltmp | (cmd[2] << 16) | (cmd[3] << 8) | cmd[4];
			printk(OSST_DEB_MSG "%s:D: Spacing tape backward %ld setmarks.\n",
						name, (-ltmp));
		 }
#endif
		 if (arg != 0) {
			blkno = fileno = (-1);
			at_sm = 1;
		 }
		 break;
	 case MTWEOF:
		 if ((STps->rw == ST_WRITING || STp->dirty) && !STp->pos_unknown) {
			STp->write_type = OS_WRITE_DATA;
			ioctl_result = osst_flush_write_buffer(STp, &SRpnt);
		 } else
			ioctl_result = 0;
#if DEBUG
		 if (debugging) 
			   printk(OSST_DEB_MSG "%s:D: Writing %ld filemark(s).\n", name, arg);
#endif
		 for (i=0; i<arg; i++)
			ioctl_result |= osst_write_filemark(STp, &SRpnt);
		 if (fileno >= 0) fileno += arg;
		 if (blkno  >= 0) blkno   = 0;
		 goto os_bypass;

	 case MTWSM:
		 if (STp->write_prot)
			return (-EACCES);
		 if (!STp->raw)
			return 0;
		 cmd[0] = WRITE_FILEMARKS;   /* FIXME -- need OS version */
		 if (cmd_in == MTWSM)
			 cmd[1] = 2;
		 cmd[2] = (arg >> 16);
		 cmd[3] = (arg >> 8);
		 cmd[4] = arg;
		 timeout = STp->timeout;
#if DEBUG
		 if (debugging) 
			   printk(OSST_DEB_MSG "%s:D: Writing %d setmark(s).\n", name,
				  cmd[2] * 65536 + cmd[3] * 256 + cmd[4]);
#endif
		 if (fileno >= 0)
			fileno += arg;
		 blkno = 0;
		 at_sm = (cmd_in == MTWSM);
		 break;
	 case MTOFFL:
	 case MTLOAD:
	 case MTUNLOAD:
	 case MTRETEN:
		 cmd[0] = START_STOP;
		 cmd[1] = 1;			/* Don't wait for completion */
		 if (cmd_in == MTLOAD) {
		     if (STp->ready == ST_NO_TAPE)
			 cmd[4] = 4;		/* open tray */
		      else
			 cmd[4] = 1;		/* load */
		 }
		 if (cmd_in == MTRETEN)
			 cmd[4] = 3;		/* retension then mount */
		 if (cmd_in == MTOFFL)
			 cmd[4] = 4;		/* rewind then eject */
		 timeout = STp->timeout;
#if DEBUG
		 if (debugging) {
			 switch (cmd_in) {
				 case MTUNLOAD:
					 printk(OSST_DEB_MSG "%s:D: Unloading tape.\n", name);
					 break;
				 case MTLOAD:
					 printk(OSST_DEB_MSG "%s:D: Loading tape.\n", name);
					 break;
				 case MTRETEN:
					 printk(OSST_DEB_MSG "%s:D: Retensioning tape.\n", name);
					 break;
				 case MTOFFL:
					 printk(OSST_DEB_MSG "%s:D: Ejecting tape.\n", name);
					 break;
			 }
		 }
#endif
       fileno = blkno = at_sm = frame_seq_numbr = logical_blk_num = 0 ;
		 break;
	 case MTNOP:
#if DEBUG
		 if (debugging)
			 printk(OSST_DEB_MSG "%s:D: No-op on tape.\n", name);
#endif
		 return 0;  /* Should do something ? */
		 break;
	 case MTEOM:
#if DEBUG
		if (debugging)
		   printk(OSST_DEB_MSG "%s:D: Spacing to end of recorded medium.\n", name);
#endif
		if ((osst_position_tape_and_confirm(STp, &SRpnt, STp->eod_frame_ppos) < 0) ||
			    (osst_get_logical_frame(STp, &SRpnt, -1, 0)               < 0)) {
		   ioctl_result = -EIO;
		   goto os_bypass;
		}
		if (STp->buffer->aux->frame_type != OS_FRAME_TYPE_EOD) {
#if DEBUG
		   printk(OSST_DEB_MSG "%s:D: No EOD frame found where expected.\n", name);
#endif
		   ioctl_result = -EIO;
		   goto os_bypass;
		}
		ioctl_result = osst_set_frame_position(STp, &SRpnt, STp->eod_frame_ppos, 0);
		fileno = STp->filemark_cnt;
		blkno  = at_sm = 0;
		goto os_bypass;

	 case MTERASE:
		if (STp->write_prot)
		   return (-EACCES);
		ioctl_result = osst_reset_header(STp, &SRpnt);
		i = osst_write_eod(STp, &SRpnt);
		if (i < ioctl_result) ioctl_result = i;
		i = osst_position_tape_and_confirm(STp, &SRpnt, STp->eod_frame_ppos);
		if (i < ioctl_result) ioctl_result = i;
		fileno = blkno = at_sm = 0 ;
		goto os_bypass;

	 case MTREW:
		cmd[0] = REZERO_UNIT; /* rewind */
		cmd[1] = 1;
#if DEBUG
		if (debugging)
		   printk(OSST_DEB_MSG "%s:D: Rewinding tape, Immed=%d.\n", name, cmd[1]);
#endif
		fileno = blkno = at_sm = frame_seq_numbr = logical_blk_num = 0 ;
		break;

	 case MTSETBLK:           /* Set block length */
		 if ((STps->drv_block == 0 )			  &&
		     !STp->dirty				  &&
		     ((STp->buffer)->buffer_bytes == 0)		  &&
		     ((arg & MT_ST_BLKSIZE_MASK) >= 512 )	  && 
		     ((arg & MT_ST_BLKSIZE_MASK) <= OS_DATA_SIZE) &&
		     !(OS_DATA_SIZE % (arg & MT_ST_BLKSIZE_MASK))  ) {
			 /*
			  * Only allowed to change the block size if you opened the
			  * device at the beginning of a file before writing anything.
			  * Note, that when reading, changing block_size is futile,
			  * as the size used when writing overrides it.
			  */
			 STp->block_size = (arg & MT_ST_BLKSIZE_MASK);
			 printk(KERN_INFO "%s:I: Block size set to %d bytes.\n",
					   name, STp->block_size);
			 return 0;
		 }
	 case MTSETDENSITY:       /* Set tape density */
	 case MTSETDRVBUFFER:     /* Set drive buffering */
	 case SET_DENS_AND_BLK:   /* Set density and block size */
		 chg_eof = 0;
		 if (STp->dirty || (STp->buffer)->buffer_bytes != 0)
			 return (-EIO);       /* Not allowed if data in buffer */
		 if ((cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) &&
		     (arg & MT_ST_BLKSIZE_MASK) != 0                    &&
		     (arg & MT_ST_BLKSIZE_MASK) != STp->block_size       ) {
			 printk(KERN_WARNING "%s:W: Illegal to set block size to %d%s.\n",
						name, (int)(arg & MT_ST_BLKSIZE_MASK),
						(OS_DATA_SIZE % (arg & MT_ST_BLKSIZE_MASK))?"":" now");
			 return (-EINVAL);
		 }
		 return 0;  /* FIXME silently ignore if block size didn't change */

	 default:
		return (-ENOSYS);
	}

	SRpnt = osst_do_scsi(SRpnt, STp, cmd, datalen, direction, timeout, MAX_RETRIES, 1);

	ioctl_result = (STp->buffer)->syscall_result;

	if (!SRpnt) {
#if DEBUG
		printk(OSST_DEB_MSG "%s:D: Couldn't exec scsi cmd for IOCTL\n", name);
#endif
		return ioctl_result;
	}

	if (!ioctl_result) {  /* SCSI command successful */
		STp->frame_seq_number = frame_seq_numbr;
		STp->logical_blk_num  = logical_blk_num;
	}

os_bypass:
#if DEBUG
	if (debugging)
		printk(OSST_DEB_MSG "%s:D: IOCTL (%d) Result=%d\n", name, cmd_in, ioctl_result);
#endif

	if (!ioctl_result) {				/* success */

		if (cmd_in == MTFSFM) {
			 fileno--;
			 blkno--;
		}
		if (cmd_in == MTBSFM) {
			 fileno++;
			 blkno++;
		}
		STps->drv_block = blkno;
		STps->drv_file = fileno;
		STps->at_sm = at_sm;

		if (cmd_in == MTEOM)
			STps->eof = ST_EOD;
		else if ((cmd_in == MTFSFM || cmd_in == MTBSF) && STps->eof == ST_FM_HIT) {
			ioctl_result = osst_seek_logical_blk(STp, &SRpnt, STp->logical_blk_num-1);
			STps->drv_block++;
			STp->logical_blk_num++;
			STp->frame_seq_number++;
			STp->frame_in_buffer = 0;
			STp->buffer->read_pointer = 0;
		}
		else if (cmd_in == MTFSF)
			STps->eof = (STp->first_frame_position >= STp->eod_frame_ppos)?ST_EOD:ST_FM;
		else if (chg_eof)
			STps->eof = ST_NOEOF;

		if (cmd_in == MTOFFL || cmd_in == MTUNLOAD)
			STp->rew_at_close = 0;
		else if (cmd_in == MTLOAD) {
			for (i=0; i < ST_NBR_PARTITIONS; i++) {
			    STp->ps[i].rw = ST_IDLE;
			    STp->ps[i].last_block_valid = 0;/* FIXME - where else is this field maintained? */
			}
			STp->partition = 0;
		}

		if (cmd_in == MTREW) {
			ioctl_result = osst_position_tape_and_confirm(STp, &SRpnt, STp->first_data_ppos); 
			if (ioctl_result > 0)
				ioctl_result = 0;
		}

	} else if (cmd_in == MTBSF || cmd_in == MTBSFM ) {
		if (osst_position_tape_and_confirm(STp, &SRpnt, STp->first_data_ppos) < 0)
			STps->drv_file = STps->drv_block = -1;
		else
			STps->drv_file = STps->drv_block = 0;
		STps->eof = ST_NOEOF;
	} else if (cmd_in == MTFSF || cmd_in == MTFSFM) {
		if (osst_position_tape_and_confirm(STp, &SRpnt, STp->eod_frame_ppos) < 0)
			STps->drv_file = STps->drv_block = -1;
		else {
			STps->drv_file  = STp->filemark_cnt;
			STps->drv_block = 0;
		}
		STps->eof = ST_EOD;
	} else if (cmd_in == MTBSR || cmd_in == MTFSR || cmd_in == MTWEOF || cmd_in == MTEOM) {
		STps->drv_file = STps->drv_block = (-1);
		STps->eof = ST_NOEOF;
		STp->header_ok = 0;
	} else if (cmd_in == MTERASE) {
		STp->header_ok = 0;
	} else if (SRpnt) {  /* SCSI command was not completely successful. */
4339
		if (SRpnt->sense[2] & 0x40) {
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			STps->eof = ST_EOM_OK;
			STps->drv_block = 0;
		}
		if (chg_eof)
			STps->eof = ST_NOEOF;

4346
		if ((SRpnt->sense[2] & 0x0f) == BLANK_CHECK)
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			STps->eof = ST_EOD;

		if (cmd_in == MTLOAD && osst_wait_for_medium(STp, &SRpnt, 60))
			ioctl_result = osst_wait_ready(STp, &SRpnt, 5 * 60, OSST_WAIT_POSITION_COMPLETE);
	}
	*aSRpnt = SRpnt;

	return ioctl_result;
}


/* Open the device */
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];
4364
	struct osst_request * SRpnt = NULL;
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	struct osst_tape    * STp;
	struct st_modedef   * STm;
	struct st_partstat  * STps;
	char		    * name;
	int		      dev  = TAPE_NR(inode);
	int		      mode = TAPE_MODE(inode);

	/*
	 * We really want to do nonseekable_open(inode, filp); here, but some
	 * versions of tar incorrectly call lseek on tapes and bail out if that
	 * fails.  So we disallow pread() and pwrite(), but permit lseeks.
	 */
	filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);

	write_lock(&os_scsi_tapes_lock);
	if (dev >= osst_max_dev || os_scsi_tapes == NULL ||
	    (STp = os_scsi_tapes[dev]) == NULL || !STp->device) {
		write_unlock(&os_scsi_tapes_lock);
		return (-ENXIO);
	}

	name = tape_name(STp);

	if (STp->in_use) {
		write_unlock(&os_scsi_tapes_lock);
#if DEBUG
		printk(OSST_DEB_MSG "%s:D: Device already in use.\n", name);
#endif
		return (-EBUSY);
	}
	if (scsi_device_get(STp->device)) {
		write_unlock(&os_scsi_tapes_lock);
#if DEBUG
                printk(OSST_DEB_MSG "%s:D: Failed scsi_device_get.\n", name);
#endif
		return (-ENXIO);
	}
	filp->private_data = STp;
	STp->in_use = 1;
	write_unlock(&os_scsi_tapes_lock);
	STp->rew_at_close = TAPE_REWIND(inode);

	if( !scsi_block_when_processing_errors(STp->device) ) {
		return -ENXIO;
	}

	if (mode != STp->current_mode) {
#if DEBUG
		if (debugging)
			printk(OSST_DEB_MSG "%s:D: Mode change from %d to %d.\n",
					       name, STp->current_mode, mode);
#endif
		new_session = 1;
		STp->current_mode = mode;
	}
	STm = &(STp->modes[STp->current_mode]);

	flags = filp->f_flags;
	STp->write_prot = ((flags & O_ACCMODE) == O_RDONLY);

	STp->raw = TAPE_IS_RAW(inode);
	if (STp->raw)
		STp->header_ok = 0;

	/* Allocate data segments for this device's tape buffer */
	if (!enlarge_buffer(STp->buffer, STp->restr_dma)) {
		printk(KERN_ERR "%s:E: Unable to allocate memory segments for tape buffer.\n", name);
		retval = (-EOVERFLOW);
		goto err_out;
	}
	if (STp->buffer->buffer_size >= OS_FRAME_SIZE) {
		for (i = 0, b_size = 0; 
		     (i < STp->buffer->sg_segs) && ((b_size + STp->buffer->sg[i].length) <= OS_DATA_SIZE); 
		     b_size += STp->buffer->sg[i++].length);
		STp->buffer->aux = (os_aux_t *) (page_address(STp->buffer->sg[i].page) + OS_DATA_SIZE - b_size);
#if DEBUG
		printk(OSST_DEB_MSG "%s:D: b_data points to %p in segment 0 at %p\n", name,
			STp->buffer->b_data, page_address(STp->buffer->sg[0].page));
		printk(OSST_DEB_MSG "%s:D: AUX points to %p in segment %d at %p\n", name,
			 STp->buffer->aux, i, page_address(STp->buffer->sg[i].page));
#endif
	} else {
		STp->buffer->aux = NULL; /* this had better never happen! */
		printk(KERN_NOTICE "%s:A: Framesize %d too large for buffer.\n", name, OS_FRAME_SIZE);
		retval = (-EIO);
		goto err_out;
	}
	STp->buffer->writing = 0;
	STp->buffer->syscall_result = 0;
	STp->dirty = 0;
	for (i=0; i < ST_NBR_PARTITIONS; i++) {
		STps = &(STp->ps[i]);
		STps->rw = ST_IDLE;
	}
	STp->ready = ST_READY;
#if DEBUG
	STp->nbr_waits = STp->nbr_finished = 0;
#endif

	memset (cmd, 0, MAX_COMMAND_SIZE);
	cmd[0] = TEST_UNIT_READY;

	SRpnt = osst_do_scsi(NULL, STp, cmd, 0, DMA_NONE, STp->timeout, MAX_RETRIES, 1);
	if (!SRpnt) {
		retval = (STp->buffer)->syscall_result;		/* FIXME - valid? */
		goto err_out;
	}
4472 4473 4474
	if ((SRpnt->sense[0] & 0x70) == 0x70      &&
	    (SRpnt->sense[2] & 0x0f) == NOT_READY &&
	     SRpnt->sense[12]        == 4         ) {
L
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4475
#if DEBUG
4476
		printk(OSST_DEB_MSG "%s:D: Unit not ready, cause %x\n", name, SRpnt->sense[13]);
L
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4477 4478 4479 4480 4481
#endif
		if (filp->f_flags & O_NONBLOCK) {
			retval = -EAGAIN;
			goto err_out;
		}
4482
		if (SRpnt->sense[13] == 2) {	/* initialize command required (LOAD) */
L
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4483 4484 4485 4486 4487 4488 4489
			memset (cmd, 0, MAX_COMMAND_SIZE);
        		cmd[0] = START_STOP;
			cmd[1] = 1;
			cmd[4] = 1;
			SRpnt = osst_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE,
					     STp->timeout, MAX_RETRIES, 1);
		}
4490
		osst_wait_ready(STp, &SRpnt, (SRpnt->sense[13]==1?15:3) * 60, 0);
L
Linus Torvalds 已提交
4491
	}
4492 4493
	if ((SRpnt->sense[0] & 0x70) == 0x70 &&
	    (SRpnt->sense[2] & 0x0f) == UNIT_ATTENTION) { /* New media? */
L
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4494 4495 4496 4497 4498 4499 4500 4501 4502 4503 4504 4505
#if DEBUG
		printk(OSST_DEB_MSG "%s:D: Unit wants attention\n", name);
#endif
		STp->header_ok = 0;

		for (i=0; i < 10; i++) {

			memset (cmd, 0, MAX_COMMAND_SIZE);
			cmd[0] = TEST_UNIT_READY;

			SRpnt = osst_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE,
					     STp->timeout, MAX_RETRIES, 1);
4506 4507
			if ((SRpnt->sense[0] & 0x70) != 0x70 ||
			    (SRpnt->sense[2] & 0x0f) != UNIT_ATTENTION)
L
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4508 4509 4510 4511 4512 4513 4514 4515 4516 4517 4518 4519 4520 4521 4522 4523 4524 4525 4526 4527 4528 4529 4530 4531 4532
				break;
		}

		STp->pos_unknown = 0;
		STp->partition = STp->new_partition = 0;
		if (STp->can_partitions)
			STp->nbr_partitions = 1;  /* This guess will be updated later if necessary */
		for (i=0; i < ST_NBR_PARTITIONS; i++) {
			STps = &(STp->ps[i]);
			STps->rw = ST_IDLE;		/* FIXME - seems to be redundant... */
			STps->eof = ST_NOEOF;
			STps->at_sm = 0;
			STps->last_block_valid = 0;
			STps->drv_block = 0;
			STps->drv_file = 0 ;
		}
		new_session = 1;
		STp->recover_count = 0;
		STp->abort_count = 0;
	}
	/*
	 * if we have valid headers from before, and the drive/tape seem untouched,
	 * open without reconfiguring and re-reading the headers
	 */
	if (!STp->buffer->syscall_result && STp->header_ok &&
4533
	    !SRpnt->result && SRpnt->sense[0] == 0) {
L
Linus Torvalds 已提交
4534 4535 4536 4537 4538 4539 4540 4541 4542 4543 4544 4545 4546 4547 4548 4549 4550 4551 4552 4553 4554 4555 4556 4557 4558 4559 4560 4561 4562 4563 4564 4565 4566 4567 4568 4569 4570 4571

		memset(cmd, 0, MAX_COMMAND_SIZE);
		cmd[0] = MODE_SENSE;
		cmd[1] = 8;
		cmd[2] = VENDOR_IDENT_PAGE;
		cmd[4] = VENDOR_IDENT_PAGE_LENGTH + MODE_HEADER_LENGTH;

		SRpnt = osst_do_scsi(SRpnt, STp, cmd, cmd[4], DMA_FROM_DEVICE, STp->timeout, 0, 1);

		if (STp->buffer->syscall_result                     ||
		    STp->buffer->b_data[MODE_HEADER_LENGTH + 2] != 'L' ||
		    STp->buffer->b_data[MODE_HEADER_LENGTH + 3] != 'I' ||
		    STp->buffer->b_data[MODE_HEADER_LENGTH + 4] != 'N' ||
		    STp->buffer->b_data[MODE_HEADER_LENGTH + 5] != '4'  ) {
#if DEBUG
			printk(OSST_DEB_MSG "%s:D: Signature was changed to %c%c%c%c\n", name,
			  STp->buffer->b_data[MODE_HEADER_LENGTH + 2],
			  STp->buffer->b_data[MODE_HEADER_LENGTH + 3],
			  STp->buffer->b_data[MODE_HEADER_LENGTH + 4],
			  STp->buffer->b_data[MODE_HEADER_LENGTH + 5]);
#endif
			STp->header_ok = 0;
		}
		i = STp->first_frame_position;
		if (STp->header_ok && i == osst_get_frame_position(STp, &SRpnt)) {
			if (STp->door_locked == ST_UNLOCKED) {
				if (do_door_lock(STp, 1))
					printk(KERN_INFO "%s:I: Can't lock drive door\n", name);
				else
					STp->door_locked = ST_LOCKED_AUTO;
			}
			if (!STp->frame_in_buffer) {
				STp->block_size = (STm->default_blksize > 0) ?
							STm->default_blksize : OS_DATA_SIZE;
				STp->buffer->buffer_bytes = STp->buffer->read_pointer = 0;
			}
			STp->buffer->buffer_blocks = OS_DATA_SIZE / STp->block_size;
			STp->fast_open = 1;
4572
			osst_release_request(SRpnt);
L
Linus Torvalds 已提交
4573 4574 4575 4576 4577 4578 4579 4580 4581 4582 4583 4584
			return 0;
		}
#if DEBUG
		if (i != STp->first_frame_position)
			printk(OSST_DEB_MSG "%s:D: Tape position changed from %d to %d\n",
						name, i, STp->first_frame_position);
#endif
		STp->header_ok = 0;
	}
	STp->fast_open = 0;

	if ((STp->buffer)->syscall_result != 0 &&   /* in all error conditions except no medium */ 
4585
	    (SRpnt->sense[2] != 2 || SRpnt->sense[12] != 0x3A) ) {
L
Linus Torvalds 已提交
4586 4587 4588 4589 4590 4591 4592 4593 4594 4595 4596 4597 4598 4599 4600 4601 4602 4603 4604 4605 4606 4607 4608 4609 4610 4611 4612 4613 4614

		memset(cmd, 0, MAX_COMMAND_SIZE);
		cmd[0] = MODE_SELECT;
		cmd[1] = 0x10;
		cmd[4] = 4 + MODE_HEADER_LENGTH;

		(STp->buffer)->b_data[0] = cmd[4] - 1;
		(STp->buffer)->b_data[1] = 0;			/* Medium Type - ignoring */
		(STp->buffer)->b_data[2] = 0;			/* Reserved */
		(STp->buffer)->b_data[3] = 0;			/* Block Descriptor Length */
		(STp->buffer)->b_data[MODE_HEADER_LENGTH + 0] = 0x3f;
		(STp->buffer)->b_data[MODE_HEADER_LENGTH + 1] = 1;
		(STp->buffer)->b_data[MODE_HEADER_LENGTH + 2] = 2;
		(STp->buffer)->b_data[MODE_HEADER_LENGTH + 3] = 3;

#if DEBUG
		printk(OSST_DEB_MSG "%s:D: Applying soft reset\n", name);
#endif
		SRpnt = osst_do_scsi(SRpnt, STp, cmd, cmd[4], DMA_TO_DEVICE, STp->timeout, 0, 1);

		STp->header_ok = 0;

		for (i=0; i < 10; i++) {

			memset (cmd, 0, MAX_COMMAND_SIZE);
			cmd[0] = TEST_UNIT_READY;

			SRpnt = osst_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE,
						    STp->timeout, MAX_RETRIES, 1);
4615 4616
			if ((SRpnt->sense[0] & 0x70) != 0x70 ||
			    (SRpnt->sense[2] & 0x0f) == NOT_READY)
L
Linus Torvalds 已提交
4617 4618
			break;

4619
			if ((SRpnt->sense[2] & 0x0f) == UNIT_ATTENTION) {
L
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4620 4621 4622 4623 4624 4625 4626 4627 4628 4629 4630 4631 4632 4633 4634 4635 4636 4637 4638 4639 4640 4641 4642
				STp->pos_unknown = 0;
				STp->partition = STp->new_partition = 0;
				if (STp->can_partitions)
					STp->nbr_partitions = 1;  /* This guess will be updated later if necessary */
				for (i=0; i < ST_NBR_PARTITIONS; i++) {
					STps = &(STp->ps[i]);
					STps->rw = ST_IDLE;
					STps->eof = ST_NOEOF;
					STps->at_sm = 0;
					STps->last_block_valid = 0;
					STps->drv_block = 0;
					STps->drv_file = 0 ;
				}
				new_session = 1;
			}
		}
	}

	if (osst_wait_ready(STp, &SRpnt, 15 * 60, 0))		/* FIXME - not allowed with NOBLOCK */
		 printk(KERN_INFO "%s:I: Device did not become Ready in open\n", name);

	if ((STp->buffer)->syscall_result != 0) {
		if ((STp->device)->scsi_level >= SCSI_2 &&
4643 4644 4645
		    (SRpnt->sense[0] & 0x70) == 0x70 &&
		    (SRpnt->sense[2] & 0x0f) == NOT_READY &&
		     SRpnt->sense[12] == 0x3a) { /* Check ASC */
L
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4646 4647 4648
			STp->ready = ST_NO_TAPE;
		} else
			STp->ready = ST_NOT_READY;
4649
		osst_release_request(SRpnt);
L
Linus Torvalds 已提交
4650 4651 4652 4653 4654 4655 4656 4657 4658 4659 4660 4661 4662 4663 4664 4665 4666 4667 4668 4669 4670 4671 4672 4673 4674 4675 4676 4677 4678 4679 4680 4681 4682 4683 4684 4685 4686 4687 4688 4689 4690 4691 4692 4693 4694 4695 4696 4697 4698 4699 4700 4701 4702 4703 4704 4705 4706 4707 4708
		SRpnt = NULL;
		STp->density = 0;   	/* Clear the erroneous "residue" */
		STp->write_prot = 0;
		STp->block_size = 0;
		STp->ps[0].drv_file = STp->ps[0].drv_block = (-1);
		STp->partition = STp->new_partition = 0;
		STp->door_locked = ST_UNLOCKED;
		return 0;
	}

	osst_configure_onstream(STp, &SRpnt);

	STp->block_size = STp->raw ? OS_FRAME_SIZE : (
			     (STm->default_blksize > 0) ? STm->default_blksize : OS_DATA_SIZE);
	STp->buffer->buffer_blocks = STp->raw ? 1 : OS_DATA_SIZE / STp->block_size;
	STp->buffer->buffer_bytes  =
	STp->buffer->read_pointer  =
	STp->frame_in_buffer       = 0;

#if DEBUG
	if (debugging)
		printk(OSST_DEB_MSG "%s:D: Block size: %d, frame size: %d, buffer size: %d (%d blocks).\n",
		     name, STp->block_size, OS_FRAME_SIZE, (STp->buffer)->buffer_size,
		     (STp->buffer)->buffer_blocks);
#endif

	if (STp->drv_write_prot) {
		STp->write_prot = 1;
#if DEBUG
		if (debugging)
			printk(OSST_DEB_MSG "%s:D: Write protected\n", name);
#endif
		if ((flags & O_ACCMODE) == O_WRONLY || (flags & O_ACCMODE) == O_RDWR) {
			retval = (-EROFS);
			goto err_out;
		}
	}

	if (new_session) {  /* Change the drive parameters for the new mode */
#if DEBUG
		if (debugging)
	printk(OSST_DEB_MSG "%s:D: New Session\n", name);
#endif
		STp->density_changed = STp->blksize_changed = 0;
		STp->compression_changed = 0;
	}

	/*
	 * properly position the tape and check the ADR headers
	 */
	if (STp->door_locked == ST_UNLOCKED) {
		 if (do_door_lock(STp, 1))
			printk(KERN_INFO "%s:I: Can't lock drive door\n", name);
		 else
			STp->door_locked = ST_LOCKED_AUTO;
	}

	osst_analyze_headers(STp, &SRpnt);

4709
	osst_release_request(SRpnt);
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4710 4711 4712 4713 4714 4715
	SRpnt = NULL;

	return 0;

err_out:
	if (SRpnt != NULL)
4716
		osst_release_request(SRpnt);
L
Linus Torvalds 已提交
4717 4718 4719 4720 4721 4722 4723 4724 4725 4726
	normalize_buffer(STp->buffer);
	STp->header_ok = 0;
	STp->in_use = 0;
	scsi_device_put(STp->device);

	return retval;
}


/* Flush the tape buffer before close */
4727
static int os_scsi_tape_flush(struct file * filp, fl_owner_t id)
L
Linus Torvalds 已提交
4728 4729 4730 4731 4732
{
	int		      result = 0, result2;
	struct osst_tape    * STp    = filp->private_data;
	struct st_modedef   * STm    = &(STp->modes[STp->current_mode]);
	struct st_partstat  * STps   = &(STp->ps[STp->partition]);
4733
	struct osst_request * SRpnt  = NULL;
L
Linus Torvalds 已提交
4734 4735 4736 4737 4738 4739 4740 4741 4742 4743 4744 4745 4746 4747 4748 4749 4750 4751 4752 4753 4754 4755 4756 4757 4758 4759 4760 4761 4762 4763 4764 4765 4766 4767 4768 4769 4770 4771 4772 4773 4774 4775 4776 4777 4778 4779 4780 4781 4782 4783 4784 4785 4786 4787 4788 4789 4790 4791 4792 4793 4794 4795
	char		    * name   = tape_name(STp);

	if (file_count(filp) > 1)
		return 0;

	if ((STps->rw == ST_WRITING || STp->dirty) && !STp->pos_unknown) {
		STp->write_type = OS_WRITE_DATA;
		result = osst_flush_write_buffer(STp, &SRpnt);
		if (result != 0 && result != (-ENOSPC))
			goto out;
	}
	if ( STps->rw >= ST_WRITING && !STp->pos_unknown) {

#if DEBUG
		if (debugging) {
			printk(OSST_DEB_MSG "%s:D: File length %ld bytes.\n",
					       name, (long)(filp->f_pos));
			printk(OSST_DEB_MSG "%s:D: Async write waits %d, finished %d.\n",
					       name, STp->nbr_waits, STp->nbr_finished);
		}
#endif
		result = osst_write_trailer(STp, &SRpnt, !(STp->rew_at_close));
#if DEBUG
		if (debugging)
			printk(OSST_DEB_MSG "%s:D: Buffer flushed, %d EOF(s) written\n",
					       name, 1+STp->two_fm);
#endif
	}
	else if (!STp->rew_at_close) {
		STps = &(STp->ps[STp->partition]);
		if (!STm->sysv || STps->rw != ST_READING) {
			if (STp->can_bsr)
				result = osst_flush_buffer(STp, &SRpnt, 0); /* this is the default path */
			else if (STps->eof == ST_FM_HIT) {
				result = cross_eof(STp, &SRpnt, 0);
					if (result) {
						if (STps->drv_file >= 0)
							STps->drv_file++;
						STps->drv_block = 0;
						STps->eof = ST_FM;
					}
					else
						STps->eof = ST_NOEOF;
			}
		}
		else if ((STps->eof == ST_NOEOF &&
			  !(result = cross_eof(STp, &SRpnt, 1))) ||
			 STps->eof == ST_FM_HIT) {
			if (STps->drv_file >= 0)
				STps->drv_file++;
			STps->drv_block = 0;
			STps->eof = ST_FM;
		}
	}

out:
	if (STp->rew_at_close) {
		result2 = osst_position_tape_and_confirm(STp, &SRpnt, STp->first_data_ppos);
		STps->drv_file = STps->drv_block = STp->frame_seq_number = STp->logical_blk_num = 0;
		if (result == 0 && result2 < 0)
			result = result2;
	}
4796
	if (SRpnt) osst_release_request(SRpnt);
L
Linus Torvalds 已提交
4797 4798 4799 4800 4801 4802 4803 4804 4805 4806 4807 4808 4809 4810 4811 4812 4813 4814 4815 4816 4817 4818 4819 4820 4821 4822 4823 4824 4825 4826 4827 4828 4829 4830 4831 4832 4833 4834 4835 4836 4837 4838 4839 4840 4841 4842 4843 4844 4845

	if (STp->abort_count || STp->recover_count) {
		printk(KERN_INFO "%s:I:", name);
		if (STp->abort_count)
			printk(" %d unrecovered errors", STp->abort_count);
		if (STp->recover_count)
			printk(" %d recovered errors", STp->recover_count);
		if (STp->write_count)
			printk(" in %d frames written", STp->write_count);
		if (STp->read_count)
			printk(" in %d frames read", STp->read_count);
		printk("\n");
		STp->recover_count = 0;
		STp->abort_count   = 0;
	}
	STp->write_count = 0;
	STp->read_count  = 0;

	return result;
}


/* Close the device and release it */
static int os_scsi_tape_close(struct inode * inode, struct file * filp)
{
	int		      result = 0;
	struct osst_tape    * STp    = filp->private_data;

	if (STp->door_locked == ST_LOCKED_AUTO)
		do_door_lock(STp, 0);

	if (STp->raw)
		STp->header_ok = 0;
	
	normalize_buffer(STp->buffer);
	write_lock(&os_scsi_tapes_lock);
	STp->in_use = 0;
	write_unlock(&os_scsi_tapes_lock);

	scsi_device_put(STp->device);

	return result;
}


/* The ioctl command */
static int osst_ioctl(struct inode * inode,struct file * file,
	 unsigned int cmd_in, unsigned long arg)
{
4846
	int		      i, cmd_nr, cmd_type, blk, retval = 0;
L
Linus Torvalds 已提交
4847 4848
	struct st_modedef   * STm;
	struct st_partstat  * STps;
4849
	struct osst_request * SRpnt = NULL;
L
Linus Torvalds 已提交
4850 4851 4852 4853 4854 4855 4856 4857 4858 4859 4860 4861 4862 4863 4864 4865 4866 4867 4868 4869 4870 4871 4872 4873 4874 4875 4876 4877 4878 4879 4880 4881 4882 4883 4884 4885 4886 4887 4888 4889 4890 4891 4892 4893 4894 4895 4896 4897 4898 4899 4900 4901 4902 4903 4904 4905 4906 4907 4908 4909 4910 4911 4912 4913 4914 4915 4916 4917 4918 4919 4920 4921 4922 4923 4924 4925 4926 4927 4928 4929 4930 4931 4932 4933 4934 4935 4936 4937 4938 4939 4940 4941 4942 4943 4944 4945 4946 4947 4948 4949 4950 4951 4952 4953 4954 4955 4956 4957 4958 4959 4960 4961 4962 4963 4964 4965 4966 4967 4968 4969 4970 4971 4972 4973 4974 4975 4976 4977 4978 4979 4980 4981 4982 4983 4984 4985 4986 4987 4988 4989 4990 4991 4992 4993 4994 4995 4996 4997 4998 4999 5000 5001 5002 5003 5004 5005 5006 5007 5008 5009 5010 5011 5012 5013 5014 5015 5016 5017 5018 5019 5020 5021 5022 5023 5024 5025 5026 5027 5028 5029 5030 5031 5032 5033 5034 5035 5036 5037 5038 5039 5040 5041 5042 5043 5044 5045 5046 5047 5048 5049 5050 5051 5052 5053 5054 5055 5056 5057 5058 5059 5060 5061 5062 5063 5064 5065 5066 5067 5068 5069 5070 5071 5072 5073 5074 5075 5076 5077 5078 5079 5080 5081 5082 5083 5084 5085 5086 5087 5088 5089 5090 5091 5092 5093 5094 5095 5096 5097 5098 5099 5100 5101 5102 5103 5104 5105 5106 5107 5108 5109 5110 5111 5112 5113 5114 5115 5116 5117 5118 5119 5120 5121 5122 5123 5124 5125 5126 5127 5128 5129 5130 5131 5132 5133 5134 5135 5136 5137 5138 5139 5140 5141 5142 5143 5144 5145 5146 5147 5148 5149 5150 5151 5152 5153 5154 5155 5156 5157 5158 5159 5160 5161 5162
	struct osst_tape    * STp   = file->private_data;
	char		    * name  = tape_name(STp);
	void	    __user  * p     = (void __user *)arg;

	if (down_interruptible(&STp->lock))
		return -ERESTARTSYS;

#if DEBUG
	if (debugging && !STp->in_use) {
		printk(OSST_DEB_MSG "%s:D: Incorrect device.\n", name);
		retval = (-EIO);
		goto out;
	}
#endif
	STm = &(STp->modes[STp->current_mode]);
	STps = &(STp->ps[STp->partition]);

	/*
	 * If we are in the middle of error recovery, don't let anyone
	 * else try and use this device.  Also, if error recovery fails, it
	 * may try and take the device offline, in which case all further
	 * access to the device is prohibited.
	 */
	if( !scsi_block_when_processing_errors(STp->device) ) {
		retval = (-ENXIO);
		goto out;
	}

	cmd_type = _IOC_TYPE(cmd_in);
	cmd_nr   = _IOC_NR(cmd_in);
#if DEBUG
	printk(OSST_DEB_MSG "%s:D: Ioctl %d,%d in %s mode\n", name,
			    cmd_type, cmd_nr, STp->raw?"raw":"normal");
#endif
	if (cmd_type == _IOC_TYPE(MTIOCTOP) && cmd_nr == _IOC_NR(MTIOCTOP)) {
		struct mtop mtc;
		int    auto_weof = 0;

		if (_IOC_SIZE(cmd_in) != sizeof(mtc)) {
			retval = (-EINVAL);
			goto out;
		}

		i = copy_from_user((char *) &mtc, p, sizeof(struct mtop));
		if (i) {
			retval = (-EFAULT);
			goto out;
		}

		if (mtc.mt_op == MTSETDRVBUFFER && !capable(CAP_SYS_ADMIN)) {
			printk(KERN_WARNING "%s:W: MTSETDRVBUFFER only allowed for root.\n", name);
			retval = (-EPERM);
			goto out;
		}

		if (!STm->defined && (mtc.mt_op != MTSETDRVBUFFER && (mtc.mt_count & MT_ST_OPTIONS) == 0)) {
			retval = (-ENXIO);
			goto out;
		}

		if (!STp->pos_unknown) {

			if (STps->eof == ST_FM_HIT) {
				if (mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM|| mtc.mt_op == MTEOM) {
					mtc.mt_count -= 1;
					if (STps->drv_file >= 0)
						STps->drv_file += 1;
				}
				else if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) {
					mtc.mt_count += 1;
					if (STps->drv_file >= 0)
						STps->drv_file += 1;
				}
			}

			if (mtc.mt_op == MTSEEK) {
				/* Old position must be restored if partition will be changed */
				i = !STp->can_partitions || (STp->new_partition != STp->partition);
			}
			else {
				i = mtc.mt_op == MTREW   || mtc.mt_op == MTOFFL ||
				    mtc.mt_op == MTRETEN || mtc.mt_op == MTEOM  ||
				    mtc.mt_op == MTLOCK  || mtc.mt_op == MTLOAD ||
				    mtc.mt_op == MTFSF   || mtc.mt_op == MTFSFM ||
				    mtc.mt_op == MTBSF   || mtc.mt_op == MTBSFM ||
				    mtc.mt_op == MTCOMPRESSION;
			}
			i = osst_flush_buffer(STp, &SRpnt, i);
			if (i < 0) {
				retval = i;
				goto out;
			}
		}
		else {
			/*
			 * If there was a bus reset, block further access
			 * to this device.  If the user wants to rewind the tape,
			 * then reset the flag and allow access again.
			 */
			if(mtc.mt_op != MTREW   &&
			   mtc.mt_op != MTOFFL  &&
			   mtc.mt_op != MTRETEN &&
			   mtc.mt_op != MTERASE &&
			   mtc.mt_op != MTSEEK  &&
			   mtc.mt_op != MTEOM)   {
				retval = (-EIO);
				goto out;
			}
			reset_state(STp);
			/* remove this when the midlevel properly clears was_reset */
			STp->device->was_reset = 0;
		}

		if (mtc.mt_op != MTCOMPRESSION  && mtc.mt_op != MTLOCK         &&
		    mtc.mt_op != MTNOP          && mtc.mt_op != MTSETBLK       &&
		    mtc.mt_op != MTSETDENSITY   && mtc.mt_op != MTSETDRVBUFFER && 
		    mtc.mt_op != MTMKPART       && mtc.mt_op != MTSETPART      &&
		    mtc.mt_op != MTWEOF         && mtc.mt_op != MTWSM           ) {

			/*
			 * The user tells us to move to another position on the tape.
			 * If we were appending to the tape content, that would leave
			 * the tape without proper end, in that case write EOD and
			 * update the header to reflect its position.
			 */
#if DEBUG
			printk(KERN_WARNING "%s:D: auto_weod %s at ffp=%d,efp=%d,fsn=%d,lbn=%d,fn=%d,bn=%d\n", name,
					STps->rw >= ST_WRITING ? "write" : STps->rw == ST_READING ? "read" : "idle",
					STp->first_frame_position, STp->eod_frame_ppos, STp->frame_seq_number,
					STp->logical_blk_num, STps->drv_file, STps->drv_block );
#endif
			if (STps->rw >= ST_WRITING && STp->first_frame_position >= STp->eod_frame_ppos) {
				auto_weof = ((STp->write_type != OS_WRITE_NEW_MARK) &&
							!(mtc.mt_op == MTREW || mtc.mt_op == MTOFFL));
				i = osst_write_trailer(STp, &SRpnt,
							!(mtc.mt_op == MTREW || mtc.mt_op == MTOFFL));
#if DEBUG
				printk(KERN_WARNING "%s:D: post trailer xeof=%d,ffp=%d,efp=%d,fsn=%d,lbn=%d,fn=%d,bn=%d\n",
						name, auto_weof, STp->first_frame_position, STp->eod_frame_ppos,
						STp->frame_seq_number, STp->logical_blk_num, STps->drv_file, STps->drv_block );
#endif
				if (i < 0) {
					retval = i;
					goto out;
				}
			}
			STps->rw = ST_IDLE;
		}

		if (mtc.mt_op == MTOFFL && STp->door_locked != ST_UNLOCKED)
			do_door_lock(STp, 0);  /* Ignore result! */

		if (mtc.mt_op == MTSETDRVBUFFER &&
		   (mtc.mt_count & MT_ST_OPTIONS) != 0) {
			retval = osst_set_options(STp, mtc.mt_count);
			goto out;
		}

		if (mtc.mt_op == MTSETPART) {
			if (mtc.mt_count >= STp->nbr_partitions)
				retval = -EINVAL;
			else {
				STp->new_partition = mtc.mt_count;
				retval = 0;
			}
			goto out;
		}

		if (mtc.mt_op == MTMKPART) {
			if (!STp->can_partitions) {
				retval = (-EINVAL);
				goto out;
			}
			if ((i = osst_int_ioctl(STp, &SRpnt, MTREW, 0)) < 0 /*||
			    (i = partition_tape(inode, mtc.mt_count)) < 0*/) {
				retval = i;
				goto out;
			}
			for (i=0; i < ST_NBR_PARTITIONS; i++) {
				STp->ps[i].rw = ST_IDLE;
				STp->ps[i].at_sm = 0;
				STp->ps[i].last_block_valid = 0;
			}
			STp->partition = STp->new_partition = 0;
			STp->nbr_partitions = 1;  /* Bad guess ?-) */
			STps->drv_block = STps->drv_file = 0;
			retval = 0;
			goto out;
	 	}

		if (mtc.mt_op == MTSEEK) {
			if (STp->raw)
				i = osst_set_frame_position(STp, &SRpnt, mtc.mt_count, 0);
			else
				i = osst_seek_sector(STp, &SRpnt, mtc.mt_count);
			if (!STp->can_partitions)
				STp->ps[0].rw = ST_IDLE;
			retval = i;
			goto out;
		}
 
		if (mtc.mt_op == MTLOCK || mtc.mt_op == MTUNLOCK) {
			retval = do_door_lock(STp, (mtc.mt_op == MTLOCK));
			goto out;
		}

		if (auto_weof)
			cross_eof(STp, &SRpnt, 0);

		if (mtc.mt_op == MTCOMPRESSION)
			retval = -EINVAL;       /* OnStream drives don't have compression hardware */
		else
			/* MTBSF MTBSFM MTBSR MTBSS MTEOM MTERASE MTFSF MTFSFB MTFSR MTFSS
			 * MTLOAD MTOFFL MTRESET MTRETEN MTREW MTUNLOAD MTWEOF MTWSM */
			retval = osst_int_ioctl(STp, &SRpnt, mtc.mt_op, mtc.mt_count);
		goto out;
	}

	if (!STm->defined) {
		retval = (-ENXIO);
		goto out;
	}

	if ((i = osst_flush_buffer(STp, &SRpnt, 0)) < 0) {
		retval = i;
		goto out;
	}

	if (cmd_type == _IOC_TYPE(MTIOCGET) && cmd_nr == _IOC_NR(MTIOCGET)) {
		struct mtget mt_status;

		if (_IOC_SIZE(cmd_in) != sizeof(struct mtget)) {
			 retval = (-EINVAL);
			 goto out;
		}

		mt_status.mt_type = MT_ISONSTREAM_SC;
		mt_status.mt_erreg = STp->recover_erreg << MT_ST_SOFTERR_SHIFT;
		mt_status.mt_dsreg =
			((STp->block_size << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK) |
			((STp->density    << MT_ST_DENSITY_SHIFT) & MT_ST_DENSITY_MASK);
		mt_status.mt_blkno = STps->drv_block;
		mt_status.mt_fileno = STps->drv_file;
		if (STp->block_size != 0) {
			if (STps->rw == ST_WRITING)
				mt_status.mt_blkno += (STp->buffer)->buffer_bytes / STp->block_size;
			else if (STps->rw == ST_READING)
				mt_status.mt_blkno -= ((STp->buffer)->buffer_bytes +
							STp->block_size - 1) / STp->block_size;
		}

		mt_status.mt_gstat = 0;
		if (STp->drv_write_prot)
			mt_status.mt_gstat |= GMT_WR_PROT(0xffffffff);
		if (mt_status.mt_blkno == 0) {
			if (mt_status.mt_fileno == 0)
				mt_status.mt_gstat |= GMT_BOT(0xffffffff);
			else
				mt_status.mt_gstat |= GMT_EOF(0xffffffff);
		}
		mt_status.mt_resid = STp->partition;
		if (STps->eof == ST_EOM_OK || STps->eof == ST_EOM_ERROR)
			mt_status.mt_gstat |= GMT_EOT(0xffffffff);
		else if (STps->eof >= ST_EOM_OK)
			mt_status.mt_gstat |= GMT_EOD(0xffffffff);
		if (STp->density == 1)
			mt_status.mt_gstat |= GMT_D_800(0xffffffff);
		else if (STp->density == 2)
			mt_status.mt_gstat |= GMT_D_1600(0xffffffff);
		else if (STp->density == 3)
			mt_status.mt_gstat |= GMT_D_6250(0xffffffff);
		if (STp->ready == ST_READY)
			mt_status.mt_gstat |= GMT_ONLINE(0xffffffff);
		if (STp->ready == ST_NO_TAPE)
			mt_status.mt_gstat |= GMT_DR_OPEN(0xffffffff);
		if (STps->at_sm)
			mt_status.mt_gstat |= GMT_SM(0xffffffff);
		if (STm->do_async_writes || (STm->do_buffer_writes && STp->block_size != 0) ||
		    STp->drv_buffer != 0)
			mt_status.mt_gstat |= GMT_IM_REP_EN(0xffffffff);

		i = copy_to_user(p, &mt_status, sizeof(struct mtget));
		if (i) {
			retval = (-EFAULT);
			goto out;
		}

		STp->recover_erreg = 0;  /* Clear after read */
		retval = 0;
		goto out;
	} /* End of MTIOCGET */

	if (cmd_type == _IOC_TYPE(MTIOCPOS) && cmd_nr == _IOC_NR(MTIOCPOS)) {
		struct mtpos mt_pos;

		if (_IOC_SIZE(cmd_in) != sizeof(struct mtpos)) {
			retval = (-EINVAL);
			goto out;
		}
		if (STp->raw)
			blk = osst_get_frame_position(STp, &SRpnt);
		else
			blk = osst_get_sector(STp, &SRpnt);
		if (blk < 0) {
			retval = blk;
			goto out;
		}
		mt_pos.mt_blkno = blk;
		i = copy_to_user(p, &mt_pos, sizeof(struct mtpos));
		if (i)
			retval = -EFAULT;
		goto out;
	}
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	if (SRpnt) osst_release_request(SRpnt);
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	up(&STp->lock);

	return scsi_ioctl(STp->device, cmd_in, p);

out:
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	if (SRpnt) osst_release_request(SRpnt);
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	up(&STp->lock);

	return retval;
}

#ifdef CONFIG_COMPAT
static long osst_compat_ioctl(struct file * file, unsigned int cmd_in, unsigned long arg)
{
	struct osst_tape *STp = file->private_data;
	struct scsi_device *sdev = STp->device;
	int ret = -ENOIOCTLCMD;
	if (sdev->host->hostt->compat_ioctl) {

		ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg);

	}
	return ret;
}
#endif



/* Memory handling routines */

/* Try to allocate a new tape buffer skeleton. Caller must not hold os_scsi_tapes_lock */
static struct osst_buffer * new_tape_buffer( int from_initialization, int need_dma, int max_sg )
{
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	int i;
	gfp_t priority;
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	struct osst_buffer *tb;

	if (from_initialization)
		priority = GFP_ATOMIC;
	else
		priority = GFP_KERNEL;

	i = sizeof(struct osst_buffer) + (osst_max_sg_segs - 1) * sizeof(struct scatterlist);
5209
	tb = kzalloc(i, priority);
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	if (!tb) {
		printk(KERN_NOTICE "osst :I: Can't allocate new tape buffer.\n");
		return NULL;
	}
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	tb->sg_segs = tb->orig_sg_segs = 0;
	tb->use_sg = max_sg;
	tb->in_use = 1;
	tb->dma = need_dma;
	tb->buffer_size = 0;
#if DEBUG
	if (debugging) 
		printk(OSST_DEB_MSG
			"osst :D: Allocated tape buffer skeleton (%d bytes, %d segments, dma: %d).\n",
			   i, max_sg, need_dma);
#endif
	return tb;
}

/* Try to allocate a temporary (while a user has the device open) enlarged tape buffer */
static int enlarge_buffer(struct osst_buffer *STbuffer, int need_dma)
{
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	int segs, nbr, max_segs, b_size, order, got;
	gfp_t priority;
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	if (STbuffer->buffer_size >= OS_FRAME_SIZE)
		return 1;

	if (STbuffer->sg_segs) {
		printk(KERN_WARNING "osst :A: Buffer not previously normalized.\n");
		normalize_buffer(STbuffer);
	}
	/* See how many segments we can use -- need at least two */
	nbr = max_segs = STbuffer->use_sg;
	if (nbr <= 2)
		return 0;

	priority = GFP_KERNEL /* | __GFP_NOWARN */;
	if (need_dma)
		priority |= GFP_DMA;

	/* Try to allocate the first segment up to OS_DATA_SIZE and the others
	   big enough to reach the goal (code assumes no segments in place) */
	for (b_size = OS_DATA_SIZE, order = OSST_FIRST_ORDER; b_size >= PAGE_SIZE; order--, b_size /= 2) {
		STbuffer->sg[0].page = alloc_pages(priority, order);
		STbuffer->sg[0].offset = 0;
		if (STbuffer->sg[0].page != NULL) {
		    STbuffer->sg[0].length = b_size;
		    STbuffer->b_data = page_address(STbuffer->sg[0].page);
		    break;
		}
	}
	if (STbuffer->sg[0].page == NULL) {
		printk(KERN_NOTICE "osst :I: Can't allocate tape buffer main segment.\n");
		return 0;
	}
	/* Got initial segment of 'bsize,order', continue with same size if possible, except for AUX */
	for (segs=STbuffer->sg_segs=1, got=b_size;
	     segs < max_segs && got < OS_FRAME_SIZE; ) {
		STbuffer->sg[segs].page =
				alloc_pages(priority, (OS_FRAME_SIZE - got <= PAGE_SIZE) ? 0 : order);
		STbuffer->sg[segs].offset = 0;
		if (STbuffer->sg[segs].page == NULL) {
			if (OS_FRAME_SIZE - got <= (max_segs - segs) * b_size / 2 && order) {
				b_size /= 2;  /* Large enough for the rest of the buffers */
				order--;
				continue;
			}
			printk(KERN_WARNING "osst :W: Failed to enlarge buffer to %d bytes.\n",
						OS_FRAME_SIZE);
#if DEBUG
			STbuffer->buffer_size = got;
#endif
			normalize_buffer(STbuffer);
			return 0;
		}
		STbuffer->sg[segs].length = (OS_FRAME_SIZE - got <= PAGE_SIZE / 2) ? (OS_FRAME_SIZE - got) : b_size;
		got += STbuffer->sg[segs].length;
		STbuffer->buffer_size = got;
		STbuffer->sg_segs = ++segs;
	}
#if DEBUG
	if (debugging) {
		printk(OSST_DEB_MSG
			   "osst :D: Expanded tape buffer (%d bytes, %d->%d segments, dma: %d, at: %p).\n",
			   got, STbuffer->orig_sg_segs, STbuffer->sg_segs, need_dma, STbuffer->b_data);
		printk(OSST_DEB_MSG
			   "osst :D: segment sizes: first %d at %p, last %d bytes at %p.\n",
			   STbuffer->sg[0].length, page_address(STbuffer->sg[0].page),
			   STbuffer->sg[segs-1].length, page_address(STbuffer->sg[segs-1].page));
	}
#endif

	return 1;
}


/* Release the segments */
static void normalize_buffer(struct osst_buffer *STbuffer)
{
  int i, order, b_size;

	for (i=0; i < STbuffer->sg_segs; i++) {

		for (b_size = PAGE_SIZE, order = 0;
		     b_size < STbuffer->sg[i].length;
		     b_size *= 2, order++);

		__free_pages(STbuffer->sg[i].page, order);
		STbuffer->buffer_size -= STbuffer->sg[i].length;
	}
#if DEBUG
	if (debugging && STbuffer->orig_sg_segs < STbuffer->sg_segs)
		printk(OSST_DEB_MSG "osst :D: Buffer at %p normalized to %d bytes (segs %d).\n",
			     STbuffer->b_data, STbuffer->buffer_size, STbuffer->sg_segs);
#endif
	STbuffer->sg_segs = STbuffer->orig_sg_segs = 0;
}


/* Move data from the user buffer to the tape buffer. Returns zero (success) or
   negative error code. */
static int append_to_buffer(const char __user *ubp, struct osst_buffer *st_bp, int do_count)
{
	int i, cnt, res, offset;

	for (i=0, offset=st_bp->buffer_bytes;
	     i < st_bp->sg_segs && offset >= st_bp->sg[i].length; i++)
	offset -= st_bp->sg[i].length;
	if (i == st_bp->sg_segs) {  /* Should never happen */
		printk(KERN_WARNING "osst :A: Append_to_buffer offset overflow.\n");
		return (-EIO);
	}
	for ( ; i < st_bp->sg_segs && do_count > 0; i++) {
		cnt = st_bp->sg[i].length - offset < do_count ?
		      st_bp->sg[i].length - offset : do_count;
		res = copy_from_user(page_address(st_bp->sg[i].page) + offset, ubp, cnt);
		if (res)
			return (-EFAULT);
		do_count -= cnt;
		st_bp->buffer_bytes += cnt;
		ubp += cnt;
		offset = 0;
	}
	if (do_count) {  /* Should never happen */
		printk(KERN_WARNING "osst :A: Append_to_buffer overflow (left %d).\n",
		       do_count);
		return (-EIO);
	}
	return 0;
}


/* Move data from the tape buffer to the user buffer. Returns zero (success) or
   negative error code. */
static int from_buffer(struct osst_buffer *st_bp, char __user *ubp, int do_count)
{
	int i, cnt, res, offset;

	for (i=0, offset=st_bp->read_pointer;
	     i < st_bp->sg_segs && offset >= st_bp->sg[i].length; i++)
		offset -= st_bp->sg[i].length;
	if (i == st_bp->sg_segs) {  /* Should never happen */
		printk(KERN_WARNING "osst :A: From_buffer offset overflow.\n");
		return (-EIO);
	}
	for ( ; i < st_bp->sg_segs && do_count > 0; i++) {
		cnt = st_bp->sg[i].length - offset < do_count ?
		      st_bp->sg[i].length - offset : do_count;
		res = copy_to_user(ubp, page_address(st_bp->sg[i].page) + offset, cnt);
		if (res)
			return (-EFAULT);
		do_count -= cnt;
		st_bp->buffer_bytes -= cnt;
		st_bp->read_pointer += cnt;
		ubp += cnt;
		offset = 0;
	}
	if (do_count) {  /* Should never happen */
		printk(KERN_WARNING "osst :A: From_buffer overflow (left %d).\n", do_count);
		return (-EIO);
	}
	return 0;
}

/* Sets the tail of the buffer after fill point to zero.
   Returns zero (success) or negative error code.        */
static int osst_zero_buffer_tail(struct osst_buffer *st_bp)
{
	int	i, offset, do_count, cnt;

	for (i = 0, offset = st_bp->buffer_bytes;
	     i < st_bp->sg_segs && offset >= st_bp->sg[i].length; i++)
		offset -= st_bp->sg[i].length;
	if (i == st_bp->sg_segs) {  /* Should never happen */
		printk(KERN_WARNING "osst :A: Zero_buffer offset overflow.\n");
		return (-EIO);
	}
	for (do_count = OS_DATA_SIZE - st_bp->buffer_bytes;
	     i < st_bp->sg_segs && do_count > 0; i++) {
		cnt = st_bp->sg[i].length - offset < do_count ?
		      st_bp->sg[i].length - offset : do_count ;
		memset(page_address(st_bp->sg[i].page) + offset, 0, cnt);
		do_count -= cnt;
		offset = 0;
	}
	if (do_count) {  /* Should never happen */
		printk(KERN_WARNING "osst :A: Zero_buffer overflow (left %d).\n", do_count);
		return (-EIO);
	}
	return 0;
}

/* Copy a osst 32K chunk of memory into the buffer.
   Returns zero (success) or negative error code.  */
static int osst_copy_to_buffer(struct osst_buffer *st_bp, unsigned char *ptr)
{
	int	i, cnt, do_count = OS_DATA_SIZE;

	for (i = 0; i < st_bp->sg_segs && do_count > 0; i++) {
		cnt = st_bp->sg[i].length < do_count ?
		      st_bp->sg[i].length : do_count ;
		memcpy(page_address(st_bp->sg[i].page), ptr, cnt);
		do_count -= cnt;
		ptr      += cnt;
	}
	if (do_count || i != st_bp->sg_segs-1) {  /* Should never happen */
		printk(KERN_WARNING "osst :A: Copy_to_buffer overflow (left %d at sg %d).\n",
					 do_count, i);
		return (-EIO);
	}
	return 0;
}

/* Copy a osst 32K chunk of memory from the buffer.
   Returns zero (success) or negative error code.  */
static int osst_copy_from_buffer(struct osst_buffer *st_bp, unsigned char *ptr)
{
	int	i, cnt, do_count = OS_DATA_SIZE;

	for (i = 0; i < st_bp->sg_segs && do_count > 0; i++) {
		cnt = st_bp->sg[i].length < do_count ?
		      st_bp->sg[i].length : do_count ;
		memcpy(ptr, page_address(st_bp->sg[i].page), cnt);
		do_count -= cnt;
		ptr      += cnt;
	}
	if (do_count || i != st_bp->sg_segs-1) {  /* Should never happen */
		printk(KERN_WARNING "osst :A: Copy_from_buffer overflow (left %d at sg %d).\n",
					 do_count, i);
		return (-EIO);
	}
	return 0;
}


/* Module housekeeping */

static void validate_options (void)
{
  if (max_dev > 0)
		osst_max_dev = max_dev;  
  if (write_threshold_kbs > 0)
		osst_write_threshold = write_threshold_kbs * ST_KILOBYTE;
  if (osst_write_threshold > osst_buffer_size)
		osst_write_threshold = osst_buffer_size;
  if (max_sg_segs >= OSST_FIRST_SG)
		osst_max_sg_segs = max_sg_segs;
#if DEBUG
  printk(OSST_DEB_MSG "osst :D: max tapes %d, write threshold %d, max s/g segs %d.\n",
			   osst_max_dev, osst_write_threshold, osst_max_sg_segs);
#endif
}
	
#ifndef MODULE
/* Set the boot options. Syntax: osst=xxx,yyy,...
   where xxx is write threshold in 1024 byte blocks,
   and   yyy is number of s/g segments to use. */
static int __init osst_setup (char *str)
{
  int i, ints[5];
  char *stp;

  stp = get_options(str, ARRAY_SIZE(ints), ints);
5494

L
Linus Torvalds 已提交
5495 5496 5497 5498 5499 5500 5501 5502 5503 5504 5505 5506 5507 5508
  if (ints[0] > 0) {
	for (i = 0; i < ints[0] && i < ARRAY_SIZE(parms); i++)
		  *parms[i].val = ints[i + 1];
  } else {
	while (stp != NULL) {
		for (i = 0; i < ARRAY_SIZE(parms); i++) {
			int len = strlen(parms[i].name);
			if (!strncmp(stp, parms[i].name, len) &&
			    (*(stp + len) == ':' || *(stp + len) == '=')) {
				*parms[i].val =
					simple_strtoul(stp + len + 1, NULL, 0);
				break;
			}
		}
5509
		if (i >= ARRAY_SIZE(parms))
L
Linus Torvalds 已提交
5510 5511 5512 5513 5514 5515 5516 5517 5518 5519 5520 5521 5522 5523 5524 5525 5526 5527 5528 5529 5530 5531 5532 5533 5534 5535 5536 5537 5538 5539 5540 5541 5542 5543 5544 5545 5546 5547 5548 5549 5550 5551 5552 5553 5554 5555 5556 5557 5558 5559 5560 5561 5562 5563 5564 5565 5566 5567 5568 5569 5570 5571 5572 5573 5574 5575 5576
			printk(KERN_INFO "osst :I: Illegal parameter in '%s'\n",
			       stp);
		stp = strchr(stp, ',');
		if (stp)
			stp++;
	}
  }

  return 1;
}

__setup("osst=", osst_setup);

#endif

static struct file_operations osst_fops = {
	.owner =        THIS_MODULE,
	.read =         osst_read,
	.write =        osst_write,
	.ioctl =        osst_ioctl,
#ifdef CONFIG_COMPAT
	.compat_ioctl = osst_compat_ioctl,
#endif
	.open =         os_scsi_tape_open,
	.flush =        os_scsi_tape_flush,
	.release =      os_scsi_tape_close,
};

static int osst_supports(struct scsi_device * SDp)
{
	struct	osst_support_data {
		char *vendor;
		char *model;
		char *rev;
		char *driver_hint; /* Name of the correct driver, NULL if unknown */
	};

static	struct	osst_support_data support_list[] = {
		/* {"XXX", "Yy-", "", NULL},  example */
		SIGS_FROM_OSST,
		{NULL, }};

	struct	osst_support_data *rp;

	/* We are willing to drive OnStream SC-x0 as well as the
	 * 	 * IDE, ParPort, FireWire, USB variants, if accessible by
	 * 	 	 * emulation layer (ide-scsi, usb-storage, ...) */

	for (rp=&(support_list[0]); rp->vendor != NULL; rp++)
		if (!strncmp(rp->vendor, SDp->vendor, strlen(rp->vendor)) &&
		    !strncmp(rp->model, SDp->model, strlen(rp->model)) &&
		    !strncmp(rp->rev, SDp->rev, strlen(rp->rev))) 
			return 1;
	return 0;
}

/*
 * sysfs support for osst driver parameter information
 */

static ssize_t osst_version_show(struct device_driver *ddd, char *buf)
{
	return snprintf(buf, PAGE_SIZE, "%s\n", osst_version);
}

static DRIVER_ATTR(version, S_IRUGO, osst_version_show, NULL);

5577
static int osst_create_driverfs_files(struct device_driver *driverfs)
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5578
{
5579
	return driver_create_file(driverfs, &driver_attr_version);
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5580 5581 5582 5583 5584 5585 5586 5587 5588 5589 5590 5591 5592 5593 5594 5595 5596 5597 5598 5599 5600 5601 5602 5603 5604 5605 5606 5607 5608 5609 5610 5611 5612 5613 5614 5615 5616 5617 5618 5619 5620 5621 5622 5623 5624 5625 5626 5627 5628 5629 5630 5631 5632 5633 5634 5635 5636 5637 5638 5639 5640 5641 5642 5643 5644 5645 5646 5647 5648 5649 5650 5651 5652 5653 5654 5655 5656 5657 5658 5659 5660 5661 5662
}

static void osst_remove_driverfs_files(struct device_driver *driverfs)
{
	driver_remove_file(driverfs, &driver_attr_version);
}

/*
 * sysfs support for accessing ADR header information
 */

static ssize_t osst_adr_rev_show(struct class_device *class_dev, char *buf)
{
	struct osst_tape * STp = (struct osst_tape *) class_get_devdata (class_dev);
	ssize_t l = 0;

	if (STp && STp->header_ok && STp->linux_media)
		l = snprintf(buf, PAGE_SIZE, "%d.%d\n", STp->header_cache->major_rev, STp->header_cache->minor_rev);
	return l;
}

CLASS_DEVICE_ATTR(ADR_rev, S_IRUGO, osst_adr_rev_show, NULL);

static ssize_t osst_linux_media_version_show(struct class_device *class_dev, char *buf)
{
	struct osst_tape * STp = (struct osst_tape *) class_get_devdata (class_dev);
	ssize_t l = 0;

	if (STp && STp->header_ok && STp->linux_media)
		l = snprintf(buf, PAGE_SIZE, "LIN%d\n", STp->linux_media_version);
	return l;
}

CLASS_DEVICE_ATTR(media_version, S_IRUGO, osst_linux_media_version_show, NULL);

static ssize_t osst_capacity_show(struct class_device *class_dev, char *buf)
{
	struct osst_tape * STp = (struct osst_tape *) class_get_devdata (class_dev);
	ssize_t l = 0;

	if (STp && STp->header_ok && STp->linux_media)
		l = snprintf(buf, PAGE_SIZE, "%d\n", STp->capacity);
	return l;
}

CLASS_DEVICE_ATTR(capacity, S_IRUGO, osst_capacity_show, NULL);

static ssize_t osst_first_data_ppos_show(struct class_device *class_dev, char *buf)
{
	struct osst_tape * STp = (struct osst_tape *) class_get_devdata (class_dev);
	ssize_t l = 0;

	if (STp && STp->header_ok && STp->linux_media)
		l = snprintf(buf, PAGE_SIZE, "%d\n", STp->first_data_ppos);
	return l;
}

CLASS_DEVICE_ATTR(BOT_frame, S_IRUGO, osst_first_data_ppos_show, NULL);

static ssize_t osst_eod_frame_ppos_show(struct class_device *class_dev, char *buf)
{
	struct osst_tape * STp = (struct osst_tape *) class_get_devdata (class_dev);
	ssize_t l = 0;

	if (STp && STp->header_ok && STp->linux_media)
		l = snprintf(buf, PAGE_SIZE, "%d\n", STp->eod_frame_ppos);
	return l;
}

CLASS_DEVICE_ATTR(EOD_frame, S_IRUGO, osst_eod_frame_ppos_show, NULL);

static ssize_t osst_filemark_cnt_show(struct class_device *class_dev, char *buf)
{
	struct osst_tape * STp = (struct osst_tape *) class_get_devdata (class_dev);
	ssize_t l = 0;

	if (STp && STp->header_ok && STp->linux_media)
		l = snprintf(buf, PAGE_SIZE, "%d\n", STp->filemark_cnt);
	return l;
}

CLASS_DEVICE_ATTR(file_count, S_IRUGO, osst_filemark_cnt_show, NULL);

5663
static struct class *osst_sysfs_class;
L
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5664

5665
static int osst_sysfs_init(void)
L
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5666
{
5667
	osst_sysfs_class = class_create(THIS_MODULE, "onstream_tape");
5668 5669 5670 5671 5672 5673
	if (IS_ERR(osst_sysfs_class)) {
		printk(KERN_ERR "osst :W: Unable to register sysfs class\n");
		return PTR_ERR(osst_sysfs_class);
	}

	return 0;
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}

5676
static void osst_sysfs_destroy(dev_t dev)
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5677
{
5678 5679
	class_device_destroy(osst_sysfs_class, dev);
}
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5681 5682 5683 5684
static int osst_sysfs_add(dev_t dev, struct device *device, struct osst_tape * STp, char * name)
{
	struct class_device *osst_class_member;
	int err;
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5685

5686 5687
	osst_class_member = class_device_create(osst_sysfs_class, NULL, dev,
						device, "%s", name);
L
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5688 5689
	if (IS_ERR(osst_class_member)) {
		printk(KERN_WARNING "osst :W: Unable to add sysfs class member %s\n", name);
5690
		return PTR_ERR(osst_class_member);
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5691
	}
5692

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5693
	class_set_devdata(osst_class_member, STp);
5694 5695 5696 5697 5698 5699 5700 5701 5702 5703 5704 5705 5706 5707 5708 5709 5710 5711 5712 5713 5714 5715 5716 5717
	err = class_device_create_file(osst_class_member,
				       &class_device_attr_ADR_rev);
	if (err)
		goto err_out;
	err = class_device_create_file(osst_class_member,
				       &class_device_attr_media_version);
	if (err)
		goto err_out;
	err = class_device_create_file(osst_class_member,
				       &class_device_attr_capacity);
	if (err)
		goto err_out;
	err = class_device_create_file(osst_class_member,
				       &class_device_attr_BOT_frame);
	if (err)
		goto err_out;
	err = class_device_create_file(osst_class_member,
				       &class_device_attr_EOD_frame);
	if (err)
		goto err_out;
	err = class_device_create_file(osst_class_member,
				       &class_device_attr_file_count);
	if (err)
		goto err_out;
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5718

5719
	return 0;
L
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5720

5721 5722 5723
err_out:
	osst_sysfs_destroy(dev);
	return err;
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}

static void osst_sysfs_cleanup(void)
{
5728
	class_destroy(osst_sysfs_class);
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5729 5730 5731 5732 5733 5734 5735 5736 5737 5738 5739 5740 5741 5742
}

/*
 * osst startup / cleanup code
 */

static int osst_probe(struct device *dev)
{
	struct scsi_device * SDp = to_scsi_device(dev);
	struct osst_tape   * tpnt;
	struct st_modedef  * STm;
	struct st_partstat * STps;
	struct osst_buffer * buffer;
	struct gendisk	   * drive;
5743
	int		     i, dev_num, err = -ENODEV;
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	if (SDp->type != TYPE_TAPE || !osst_supports(SDp))
		return -ENODEV;

	drive = alloc_disk(1);
	if (!drive) {
		printk(KERN_ERR "osst :E: Out of memory. Device not attached.\n");
		return -ENODEV;
	}

	/* if this is the first attach, build the infrastructure */
	write_lock(&os_scsi_tapes_lock);
	if (os_scsi_tapes == NULL) {
		os_scsi_tapes =
			(struct osst_tape **)kmalloc(osst_max_dev * sizeof(struct osst_tape *),
				   GFP_ATOMIC);
		if (os_scsi_tapes == NULL) {
			write_unlock(&os_scsi_tapes_lock);
			printk(KERN_ERR "osst :E: Unable to allocate array for OnStream SCSI tapes.\n");
			goto out_put_disk;
		}
		for (i=0; i < osst_max_dev; ++i) os_scsi_tapes[i] = NULL;
	}
	
	if (osst_nr_dev >= osst_max_dev) {
		write_unlock(&os_scsi_tapes_lock);
		printk(KERN_ERR "osst :E: Too many tape devices (max. %d).\n", osst_max_dev);
		goto out_put_disk;
	}

	/* find a free minor number */
	for (i=0; os_scsi_tapes[i] && i<osst_max_dev; i++);
	if(i >= osst_max_dev) panic ("Scsi_devices corrupt (osst)");
	dev_num = i;

	/* allocate a struct osst_tape for this device */
	tpnt = (struct osst_tape *)kmalloc(sizeof(struct osst_tape), GFP_ATOMIC);
	if (tpnt == NULL) {
		write_unlock(&os_scsi_tapes_lock);
		printk(KERN_ERR "osst :E: Can't allocate device descriptor, device not attached.\n");
		goto out_put_disk;
	}
	memset(tpnt, 0, sizeof(struct osst_tape));

	/* allocate a buffer for this device */
	i = SDp->host->sg_tablesize;
	if (osst_max_sg_segs < i)
		i = osst_max_sg_segs;
	buffer = new_tape_buffer(1, SDp->host->unchecked_isa_dma, i);
	if (buffer == NULL) {
		write_unlock(&os_scsi_tapes_lock);
		printk(KERN_ERR "osst :E: Unable to allocate a tape buffer, device not attached.\n");
		kfree(tpnt);
		goto out_put_disk;
	}
	os_scsi_tapes[dev_num] = tpnt;
	tpnt->buffer = buffer;
	tpnt->device = SDp;
	drive->private_data = &tpnt->driver;
	sprintf(drive->disk_name, "osst%d", dev_num);
	tpnt->driver = &osst_template;
	tpnt->drive = drive;
	tpnt->in_use = 0;
	tpnt->capacity = 0xfffff;
	tpnt->dirty = 0;
	tpnt->drv_buffer = 1;  /* Try buffering if no mode sense */
	tpnt->restr_dma = (SDp->host)->unchecked_isa_dma;
	tpnt->density = 0;
	tpnt->do_auto_lock = OSST_AUTO_LOCK;
	tpnt->can_bsr = OSST_IN_FILE_POS;
	tpnt->can_partitions = 0;
	tpnt->two_fm = OSST_TWO_FM;
	tpnt->fast_mteom = OSST_FAST_MTEOM;
	tpnt->scsi2_logical = OSST_SCSI2LOGICAL; /* FIXME */
	tpnt->write_threshold = osst_write_threshold;
	tpnt->default_drvbuffer = 0xff; /* No forced buffering */
	tpnt->partition = 0;
	tpnt->new_partition = 0;
	tpnt->nbr_partitions = 0;
	tpnt->min_block = 512;
	tpnt->max_block = OS_DATA_SIZE;
	tpnt->timeout = OSST_TIMEOUT;
	tpnt->long_timeout = OSST_LONG_TIMEOUT;

	/* Recognize OnStream tapes */
	/* We don't need to test for OnStream, as this has been done in detect () */
	tpnt->os_fw_rev = osst_parse_firmware_rev (SDp->rev);
	tpnt->omit_blklims = 1;

	tpnt->poll = (strncmp(SDp->model, "DI-", 3) == 0) || 
		     (strncmp(SDp->model, "FW-", 3) == 0) || OSST_FW_NEED_POLL(tpnt->os_fw_rev,SDp);
	tpnt->frame_in_buffer = 0;
	tpnt->header_ok = 0;
	tpnt->linux_media = 0;
	tpnt->header_cache = NULL;

	for (i=0; i < ST_NBR_MODES; i++) {
		STm = &(tpnt->modes[i]);
		STm->defined = 0;
		STm->sysv = OSST_SYSV;
		STm->defaults_for_writes = 0;
		STm->do_async_writes = OSST_ASYNC_WRITES;
		STm->do_buffer_writes = OSST_BUFFER_WRITES;
		STm->do_read_ahead = OSST_READ_AHEAD;
		STm->default_compression = ST_DONT_TOUCH;
		STm->default_blksize = 512;
		STm->default_density = (-1);  /* No forced density */
	}

	for (i=0; i < ST_NBR_PARTITIONS; i++) {
		STps = &(tpnt->ps[i]);
		STps->rw = ST_IDLE;
		STps->eof = ST_NOEOF;
		STps->at_sm = 0;
		STps->last_block_valid = 0;
		STps->drv_block = (-1);
		STps->drv_file = (-1);
	}

	tpnt->current_mode = 0;
	tpnt->modes[0].defined = 1;
	tpnt->modes[2].defined = 1;
	tpnt->density_changed = tpnt->compression_changed = tpnt->blksize_changed = 0;

	init_MUTEX(&tpnt->lock);
	osst_nr_dev++;
	write_unlock(&os_scsi_tapes_lock);
5871

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5872 5873
	{
		char name[8];
5874

L
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5875
		/*  Rewind entry  */
5876 5877 5878 5879
		err = osst_sysfs_add(MKDEV(OSST_MAJOR, dev_num), dev, tpnt, tape_name(tpnt));
		if (err)
			goto out_free_buffer;

L
Linus Torvalds 已提交
5880 5881
		/*  No-rewind entry  */
		snprintf(name, 8, "%s%s", "n", tape_name(tpnt));
5882 5883 5884
		err = osst_sysfs_add(MKDEV(OSST_MAJOR, dev_num + 128), dev, tpnt, name);
		if (err)
			goto out_free_sysfs1;
L
Linus Torvalds 已提交
5885 5886
	}

J
James Bottomley 已提交
5887
	sdev_printk(KERN_INFO, SDp,
5888 5889
		"osst :I: Attached OnStream %.5s tape as %s\n",
		SDp->model, tape_name(tpnt));
L
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5890 5891 5892

	return 0;

5893 5894 5895 5896
out_free_sysfs1:
	osst_sysfs_destroy(MKDEV(OSST_MAJOR, dev_num));
out_free_buffer:
	kfree(buffer);
L
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5897 5898
out_put_disk:
        put_disk(drive);
5899
        return err;
L
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5900 5901 5902 5903 5904 5905
};

static int osst_remove(struct device *dev)
{
	struct scsi_device * SDp = to_scsi_device(dev);
	struct osst_tape * tpnt;
5906
	int i;
L
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5907 5908 5909 5910 5911 5912 5913 5914 5915 5916 5917 5918 5919 5920

	if ((SDp->type != TYPE_TAPE) || (osst_nr_dev <= 0))
		return 0;

	write_lock(&os_scsi_tapes_lock);
	for(i=0; i < osst_max_dev; i++) {
		if((tpnt = os_scsi_tapes[i]) && (tpnt->device == SDp)) {
			osst_sysfs_destroy(MKDEV(OSST_MAJOR, i));
			osst_sysfs_destroy(MKDEV(OSST_MAJOR, i+128));
			tpnt->device = NULL;
			put_disk(tpnt->drive);
			os_scsi_tapes[i] = NULL;
			osst_nr_dev--;
			write_unlock(&os_scsi_tapes_lock);
5921
			vfree(tpnt->header_cache);
L
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5922 5923 5924 5925 5926 5927 5928 5929 5930 5931 5932 5933 5934 5935
			if (tpnt->buffer) {
				normalize_buffer(tpnt->buffer);
				kfree(tpnt->buffer);
			}
			kfree(tpnt);
			return 0;
		}
	}
	write_unlock(&os_scsi_tapes_lock);
	return 0;
}

static int __init init_osst(void) 
{
5936 5937
	int err;

L
Linus Torvalds 已提交
5938 5939 5940 5941
	printk(KERN_INFO "osst :I: Tape driver with OnStream support version %s\nosst :I: %s\n", osst_version, cvsid);

	validate_options();

5942 5943 5944 5945 5946 5947
	err = osst_sysfs_init();
	if (err)
		return err;

	err = register_chrdev(OSST_MAJOR, "osst", &osst_fops);
	if (err < 0) {
L
Linus Torvalds 已提交
5948
		printk(KERN_ERR "osst :E: Unable to register major %d for OnStream tapes\n", OSST_MAJOR);
5949
		goto err_out;
L
Linus Torvalds 已提交
5950
	}
5951 5952 5953 5954 5955 5956 5957 5958

	err = scsi_register_driver(&osst_template.gendrv);
	if (err)
		goto err_out_chrdev;

	err = osst_create_driverfs_files(&osst_template.gendrv);
	if (err)
		goto err_out_scsidrv;
L
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5959 5960

	return 0;
5961 5962 5963 5964 5965 5966 5967 5968

err_out_scsidrv:
	scsi_unregister_driver(&osst_template.gendrv);
err_out_chrdev:
	unregister_chrdev(OSST_MAJOR, "osst");
err_out:
	osst_sysfs_cleanup();
	return err;
L
Linus Torvalds 已提交
5969 5970 5971 5972 5973 5974 5975 5976 5977 5978 5979 5980 5981 5982 5983 5984
}

static void __exit exit_osst (void)
{
	int i;
	struct osst_tape * STp;

	osst_remove_driverfs_files(&osst_template.gendrv);
	scsi_unregister_driver(&osst_template.gendrv);
	unregister_chrdev(OSST_MAJOR, "osst");
	osst_sysfs_cleanup();

	if (os_scsi_tapes) {
		for (i=0; i < osst_max_dev; ++i) {
			if (!(STp = os_scsi_tapes[i])) continue;
			/* This is defensive, supposed to happen during detach */
5985
			vfree(STp->header_cache);
L
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5986 5987 5988 5989 5990 5991 5992 5993 5994 5995 5996 5997 5998 5999
			if (STp->buffer) {
				normalize_buffer(STp->buffer);
				kfree(STp->buffer);
			}
			put_disk(STp->drive);
			kfree(STp);
		}
		kfree(os_scsi_tapes);
	}
	printk(KERN_INFO "osst :I: Unloaded.\n");
}

module_init(init_osst);
module_exit(exit_osst);