PATCH: gets ide-tape working on 2.6

From: stuart hayes
Date: Thu Nov 13 2003 - 10:57:43 EST

Here's the patch in plain text.

--

Bart (et al),

Here's a patch for ide-tape.c that gets ide-tape working on the 2.6 kernel.

This should be applied after your recent patch that fixed the rq->flags stuff in ide-tape.

There's nothing in here that will make it more difficult to change the rq->flags stuff later if necessary--this will just tweak a few things to get the driver functional.

Most of this stuff is just stuff to get the Seagate STT3401A Travan tape drive working, as I already submitted for the 2.4 kernel.

Thanks!
Stuart

(I'll resend this in just a moment as plain text--I have to do that from a different email account.)



--- ide-tape.c.orig 2003-11-05 11:08:49.000000000 -0600
+++ ide-tape.c.26works 2003-11-13 09:32:53.188145144 -0600
@@ -1,5 +1,5 @@
/*
- * linux/drivers/ide/ide-tape.c Version 1.17b Oct, 2002
+ * linux/drivers/ide/ide-tape.c Version 1.18 Oct, 2003
*
* Copyright (C) 1995 - 1999 Gadi Oxman <gadio@xxxxxxxxxxxxxxxx>
*
@@ -313,6 +313,28 @@
* Cosmetic fixes to miscellaneous debugging output messages.
* Set the minimum /proc/ide/hd?/settings values for "pipeline",
* "pipeline_min", and "pipeline_max" to 1.
+ * Ver 1.18 Oct 2003 Stuart Hayes <stuart_hayes@xxxxxxxx>
+ * Check drive's write protect bit, try to return appropriate
+ * errors when attempting to write a write-protected tape
+ * Moved "idetape_read_position" call in idetape_chrdev_open
+ * after the "wait_ready" call
+ * Added IDETAPE_MEDIUM_PRESENT flag so driver would know
+ * not to rewind tape after ejecting it
+ * Fixed bug with ide_abort_pipeline (it was deleting stages
+ * from tape->next_stage to end, instead of from
+ * new_last_stage->next (tape->next_stage was set to NULL
+ * by idetape_discard_read_pipeline before calling!)
+ * Made improvements to idetape_wait_ready
+ * Added a few comments here and there
+ * Made MTOFFL unlock tape drive door before attempting to eject
+ * Added fixes to get Seagate STT3401A Travan working:
+ * handle drives that don't support 0-length reads/writes
+ * increased timeout (retension takes ~10 minutes before
+ * irq is returned)
+ * fixed request mode page packet command byte 3
+ * Changed spinlock_irqsave to spinlock when calling
+ * "idetape_wait_for_request" so IRQs wouldn't be
+ * masked when we call "wait_for_completion"
*
* Here are some words from the first releases of hd.c, which are quoted
* in ide.c and apply here as well:
@@ -422,7 +444,7 @@
* sharing a (fast) ATA-2 disk with any (slow) new ATAPI device.
*/

-#define IDETAPE_VERSION "1.17b-ac1"
+#define IDETAPE_VERSION "1.18"

#include <linux/config.h>
#include <linux/module.h>
@@ -451,7 +473,6 @@
#include <asm/bitops.h>


-#define NO_LONGER_REQUIRED (1)

/*
* OnStream support
@@ -653,8 +674,13 @@

/*
* Some tape drives require a long irq timeout
+ *
+ * Some drives (for example, the Seagate STT3401A Travan)
+ * require a very long timeout, because they don't
+ * return an interrupt or clear their busy bit until after the
+ * command completes--even retension commands.
*/
-#define IDETAPE_WAIT_CMD (60*HZ)
+#define IDETAPE_WAIT_CMD (900*HZ)

/*
* The following parameter is used to select the point in the internal
@@ -1032,6 +1058,10 @@

/* the door is currently locked */
int door_locked;
+ /* the tape hardware is write protected */
+ char drv_write_prot;
+ /* the tape is write protected (hardware or opened as read-only) */
+ char write_prot;

/*
* OnStream flags
@@ -1164,6 +1194,7 @@
#define IDETAPE_DRQ_INTERRUPT 6 /* DRQ interrupt device */
#define IDETAPE_READ_ERROR 7
#define IDETAPE_PIPELINE_ACTIVE 8 /* pipeline active */
+#define IDETAPE_MEDIUM_PRESENT 9 /* 0=no tape is loaded, so we don't rewind after ejecting */

/*
* Supported ATAPI tape drives packet commands
@@ -1665,6 +1696,20 @@
idetape_update_buffers(pc);
}

+ /* If error was the result of a zero-length read or write
+ * command, with sense key=5, asc=0x22, ascq=0, let it
+ * slide... some drives (Seagate STT3401A Travan) don't
+ * support 0-length read/writes
+ */
+
+ if ((pc->c[0] == IDETAPE_READ_CMD || pc->c[0] == IDETAPE_WRITE_CMD)
+ && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) { /* length==0 */
+ if (result->sense_key == 5) {
+ pc->error = 0; /* don't report an error, everything's ok */
+ set_bit(PC_ABORT, &pc->flags); /* don't retry read/write */
+ }
+ }
+
if (pc->c[0] == IDETAPE_READ_CMD && result->filemark) {
pc->error = IDETAPE_ERROR_FILEMARK;
set_bit(PC_ABORT, &pc->flags);
@@ -1805,10 +1850,18 @@
}
}

-static void idetape_abort_pipeline (ide_drive_t *drive, idetape_stage_t *last_stage)
+/*
+ * idetape_abort_pipeline
+ * ----------------------
+ * This will free all the pipeline stages starting from
+ * new_last_stage->next to the end of the list, and point
+ * tape->last_stage to new_last_stage.
+ */
+
+static void idetape_abort_pipeline (ide_drive_t *drive, idetape_stage_t *new_last_stage)
{
idetape_tape_t *tape = drive->driver_data;
- idetape_stage_t *stage = tape->next_stage;
+ idetape_stage_t *stage = new_last_stage->next;
idetape_stage_t *nstage;

#if IDETAPE_DEBUG_LOG
@@ -1822,9 +1875,9 @@
--tape->nr_pending_stages;
stage = nstage;
}
- tape->last_stage = last_stage;
- if (last_stage)
- last_stage->next = NULL;
+ if (new_last_stage)
+ new_last_stage->next = NULL;
+ tape->last_stage = new_last_stage;
tape->next_stage = NULL;
}

@@ -1995,6 +2048,7 @@
{
ide_init_drive_cmd(rq);
rq->buffer = (char *) pc;
+ rq->flags &= ~(REQ_DRIVE_CMD);
rq->flags |= REQ_IDETAPE_PC1;
(void) ide_do_drive_cmd(drive, rq, ide_preempt);
}
@@ -2430,7 +2484,11 @@
if (page_code != IDETAPE_BLOCK_DESCRIPTOR)
pc->c[1] = 8; /* DBD = 1 - Don't return block descriptors */
pc->c[2] = page_code;
- pc->c[3] = 255; /* Don't limit the returned information */
+ /* Changed pc->c[3] (subpages) to 0... 255 will at best return *
+ * unused info... for SCSI, this byte is defined as subpage *
+ * instead of high byte of length, and some IDE drives *
+ * seem to interpret it this way and return an error. */
+ pc->c[3] = 0; /* Don't limit the returned information */
pc->c[4] = 255; /* (We will just discard data in that case) */
if (page_code == IDETAPE_BLOCK_DESCRIPTOR)
pc->request_transfer = 12;
@@ -2544,7 +2602,8 @@
if (status.b.dsc) {
if (status.b.check) {
/* Error detected */
- printk(KERN_ERR "ide-tape: %s: I/O error, ",tape->name);
+ if (pc->c[0] != IDETAPE_TEST_UNIT_READY_CMD)
+ printk(KERN_ERR "ide-tape: %s: I/O error, ",tape->name);

/* Retry operation */
return idetape_retry_pc(drive);
@@ -3174,7 +3233,7 @@
wait_for_completion(&wait);
/* The stage and its struct request have been deallocated */
tape->waiting = NULL;
- spin_lock_irq(&tape->spinlock);
+ spin_lock(&tape->spinlock);
}

static ide_startstop_t idetape_read_position_callback (ide_drive_t *drive)
@@ -3271,6 +3330,7 @@

ide_init_drive_cmd(&rq);
rq.buffer = (char *) pc;
+ rq.flags &= ~(REQ_DRIVE_CMD);
rq.flags |= REQ_IDETAPE_PC1;
return ide_do_drive_cmd(drive, &rq, ide_wait);
}
@@ -3295,25 +3355,26 @@
{
idetape_tape_t *tape = drive->driver_data;
idetape_pc_t pc;
-
+ int load_attempted = 0;
/*
* Wait for the tape to become ready
*/
+ set_bit(IDETAPE_MEDIUM_PRESENT,&tape->flags);
timeout += jiffies;
while (time_before(jiffies, timeout)) {
idetape_create_test_unit_ready_cmd(&pc);
if (!__idetape_queue_pc_tail(drive, &pc))
return 0;
- if (tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2) {
- idetape_create_load_unload_cmd(drive, &pc, IDETAPE_LU_LOAD_MASK);
- __idetape_queue_pc_tail(drive, &pc);
- idetape_create_test_unit_ready_cmd(&pc);
- if (!__idetape_queue_pc_tail(drive, &pc))
- return 0;
- }
- if (!(tape->sense_key == 2 && tape->asc == 4 &&
- (tape->ascq == 1 || tape->ascq == 8)))
- break;
+ if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2)
+ || (tape->asc == 0x3A)) { /* no media... */
+ if (!load_attempted) {
+ idetape_create_load_unload_cmd(drive, &pc, IDETAPE_LU_LOAD_MASK);
+ __idetape_queue_pc_tail(drive, &pc);
+ load_attempted = 1;
+ } else return -ENOMEDIUM;
+ } else if (!(tape->sense_key == 2 && tape->asc == 4 &&
+ (tape->ascq == 1 || tape->ascq == 8))) /* not about to be ready... */
+ return -EIO;
current->state = TASK_INTERRUPTIBLE;
schedule_timeout(HZ / 10);
}
@@ -3436,6 +3497,8 @@

if (tape->chrdev_direction != idetape_direction_read)
return 0;
+
+ /* Remove merge stage */
cnt = tape->merge_stage_size / tape->tape_block_size;
if (test_and_clear_bit(IDETAPE_FILEMARK, &tape->flags))
++cnt; /* Filemarks count as 1 sector */
@@ -3444,17 +3507,20 @@
__idetape_kfree_stage(tape->merge_stage);
tape->merge_stage = NULL;
}
+
+ /* Clear pipeline flags */
clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags);
tape->chrdev_direction = idetape_direction_none;
-
+
+ /* Remove pipeline stages */
if (tape->first_stage == NULL)
return 0;

- spin_lock_irqsave(&tape->spinlock, flags);
+ spin_lock(&tape->spinlock);
tape->next_stage = NULL;
if (idetape_pipeline_active(tape))
idetape_wait_for_request(drive, tape->active_data_request);
- spin_unlock_irqrestore(&tape->spinlock, flags);
+ spin_unlock(&tape->spinlock);

while (tape->first_stage != NULL) {
struct request *rq_ptr = &tape->first_stage->rq;
@@ -3547,6 +3613,7 @@
#endif /* IDETAPE_DEBUG_BUGS */

ide_init_drive_cmd(&rq);
+ rq.flags &= ~(REQ_DRIVE_CMD);
rq.special = (void *)bh;
rq.flags |= cmd;
rq.sector = tape->first_frame_position;
@@ -3597,6 +3664,7 @@
#endif
rq = &stage->rq;
ide_init_drive_cmd(rq);
+ rq->flags &= ~(REQ_DRIVE_CMD);
rq->flags |= REQ_IDETAPE_WRITE;
rq->sector = tape->first_frame_position;
rq->nr_sectors = rq->current_nr_sectors = tape->capabilities.ctl;
@@ -3820,10 +3888,10 @@

if (tape->first_stage == NULL)
return;
- spin_lock_irqsave(&tape->spinlock, flags);
+ spin_lock(&tape->spinlock);
if (tape->active_stage == tape->first_stage)
idetape_wait_for_request(drive, tape->active_data_request);
- spin_unlock_irqrestore(&tape->spinlock, flags);
+ spin_unlock(&tape->spinlock);
}

/*
@@ -3854,12 +3922,12 @@
* Pay special attention to possible race conditions.
*/
while ((new_stage = idetape_kmalloc_stage(tape)) == NULL) {
- spin_lock_irqsave(&tape->spinlock, flags);
+ spin_lock(&tape->spinlock);
if (idetape_pipeline_active(tape)) {
idetape_wait_for_request(drive, tape->active_data_request);
- spin_unlock_irqrestore(&tape->spinlock, flags);
+ spin_unlock(&tape->spinlock);
} else {
- spin_unlock_irqrestore(&tape->spinlock, flags);
+ spin_unlock(&tape->spinlock);
idetape_insert_pipeline_into_queue(drive);
if (idetape_pipeline_active(tape))
continue;
@@ -3872,6 +3940,7 @@
}
rq = &new_stage->rq;
ide_init_drive_cmd(rq);
+ rq->flags &= ~(REQ_DRIVE_CMD);
rq->flags |= REQ_IDETAPE_WRITE;
/* Doesn't actually matter - We always assume sequential access */
rq->sector = tape->first_frame_position;
@@ -3934,10 +4003,10 @@

while (tape->next_stage || idetape_pipeline_active(tape)) {
idetape_insert_pipeline_into_queue(drive);
- spin_lock_irqsave(&tape->spinlock, flags);
+ spin_lock(&tape->spinlock);
if (idetape_pipeline_active(tape))
idetape_wait_for_request(drive, tape->active_data_request);
- spin_unlock_irqrestore(&tape->spinlock, flags);
+ spin_unlock(&tape->spinlock);
}
}

@@ -4059,18 +4128,23 @@
* Issue a read 0 command to ensure that DSC handshake
* is switched from completion mode to buffer available
* mode.
+ * No point in issuing this if dsc_overlap isn't supported
+ * (some drives (Seagate STT3401A) will return an error).
*/
- bytes_read = idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, 0, tape->merge_stage->bh);
- if (bytes_read < 0) {
- __idetape_kfree_stage(tape->merge_stage);
- tape->merge_stage = NULL;
- tape->chrdev_direction = idetape_direction_none;
- return bytes_read;
+ if (drive->dsc_overlap) {
+ bytes_read = idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, 0, tape->merge_stage->bh);
+ if (bytes_read < 0) {
+ __idetape_kfree_stage(tape->merge_stage);
+ tape->merge_stage = NULL;
+ tape->chrdev_direction = idetape_direction_none;
+ return bytes_read;
+ }
}
}
if (tape->restart_speed_control_req)
idetape_restart_speed_control(drive);
ide_init_drive_cmd(&rq);
+ rq.flags &= ~(REQ_DRIVE_CMD);
rq.flags |= REQ_IDETAPE_READ;
rq.sector = tape->first_frame_position;
rq.nr_sectors = rq.current_nr_sectors = blocks;
@@ -4658,7 +4732,9 @@
static ssize_t idetape_chrdev_read (struct file *file, char *buf,
size_t count, loff_t *ppos)
{
- ide_drive_t *drive = file->private_data;
+ struct inode *inode = file->f_dentry->d_inode;
+ unsigned int minor = iminor(inode);
+ ide_drive_t *drive = idetape_chrdevs[minor & ~0xC0].drive;
idetape_tape_t *tape = drive->driver_data;
ssize_t bytes_read,temp, actually_read = 0, rc;

@@ -4887,9 +4963,9 @@
size_t count, loff_t *ppos)
{
struct inode *inode = file->f_dentry->d_inode;
- ide_drive_t *drive = file->private_data;
- idetape_tape_t *tape = drive->driver_data;
unsigned int minor = iminor(inode);
+ ide_drive_t *drive = idetape_chrdevs[minor&~0xC0].drive;
+ idetape_tape_t *tape = drive->driver_data;
ssize_t retval, actually_written = 0;
int position;

@@ -4898,6 +4974,11 @@
return -ENXIO;
}

+ if (tape->write_prot) {
+ /* The drive is write protected */
+ return -EACCES;
+ }
+
#if IDETAPE_DEBUG_LOG
if (tape->debug_level >= 3)
printk(KERN_INFO "ide-tape: Reached idetape_chrdev_write, "
@@ -4979,13 +5060,17 @@
* Issue a write 0 command to ensure that DSC handshake
* is switched from completion mode to buffer available
* mode.
+ * No point in issuing this if dsc_overlap isn't supported
+ * (some drives (Seagate STT3401A) will return an error).
*/
- retval = idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, 0, tape->merge_stage->bh);
- if (retval < 0) {
- __idetape_kfree_stage(tape->merge_stage);
- tape->merge_stage = NULL;
- tape->chrdev_direction = idetape_direction_none;
- return retval;
+ if (drive->dsc_overlap) {
+ retval = idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, 0, tape->merge_stage->bh);
+ if (retval < 0) {
+ __idetape_kfree_stage(tape->merge_stage);
+ tape->merge_stage = NULL;
+ tape->chrdev_direction = idetape_direction_none;
+ return retval;
+ }
}
#if ONSTREAM_DEBUG
if (tape->debug_level >= 2)
@@ -5141,7 +5226,7 @@
* Note:
*
* MTBSF and MTBSFM are not supported when the tape doesn't
- * supports spacing over filemarks in the reverse direction.
+ * support spacing over filemarks in the reverse direction.
* In this case, MTFSFM is also usually not supported (it is
* supported in the rare case in which we crossed the filemark
* during our read-ahead pipelined operation mode).
@@ -5211,6 +5296,8 @@
}
switch (mt_op) {
case MTWEOF:
+ if (tape->write_prot)
+ return -EACCES;
idetape_discard_read_pipeline(drive, 1);
for (i = 0; i < mt_count; i++) {
retval = idetape_write_filemark(drive);
@@ -5232,8 +5319,16 @@
case MTUNLOAD:
case MTOFFL:
idetape_discard_read_pipeline(drive, 0);
+ /* if door is locked, attempt to unlock */
+ /* before attempting to eject */
+ if (tape->door_locked)
+ if (idetape_create_prevent_cmd(drive, &pc, 0))
+ if (!idetape_queue_pc_tail(drive, &pc))
+ tape->door_locked = DOOR_UNLOCKED;
idetape_create_load_unload_cmd(drive, &pc,!IDETAPE_LU_LOAD_MASK);
- return (idetape_queue_pc_tail(drive, &pc));
+ if (!(retval= idetape_queue_pc_tail(drive, &pc)))
+ clear_bit(IDETAPE_MEDIUM_PRESENT,&tape->flags);
+ return retval;
case MTNOP:
idetape_discard_read_pipeline(drive, 0);
return (idetape_flush_tape_buffers(drive));
@@ -5363,7 +5458,7 @@
*/
static int idetape_chrdev_ioctl (struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
{
- ide_drive_t *drive = file->private_data;
+ ide_drive_t *drive = idetape_chrdevs[iminor(inode)&~0xC0].drive;
idetape_tape_t *tape = drive->driver_data;
struct mtop mtop;
struct mtget mtget;
@@ -5403,12 +5498,15 @@
mtget.mt_blkno = tape->logical_blk_num;
}
mtget.mt_dsreg = ((tape->tape_block_size * tape->user_bs_factor) << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK;
+ mtget.mt_gstat = 0;
if (tape->onstream) {
mtget.mt_gstat |= GMT_ONLINE(0xffffffff);
if (tape->first_stage && tape->first_stage->aux->frame_type == OS_FRAME_TYPE_EOD)
mtget.mt_gstat |= GMT_EOD(0xffffffff);
if (position <= OS_DATA_STARTFRAME1)
mtget.mt_gstat |= GMT_BOT(0xffffffff);
+ } else {
+ if (tape->drv_write_prot) mtget.mt_gstat |= GMT_WR_PROT(0xffffffff);
}
if (copy_to_user((char *) arg,(char *) &mtget, sizeof(struct mtget)))
return -EFAULT;
@@ -5530,6 +5628,8 @@
return 1;
}

+static void idetape_get_blocksize_from_block_descriptor(ide_drive_t *drive);
+
/*
* Our character device open function.
*/
@@ -5539,7 +5639,8 @@
ide_drive_t *drive;
idetape_tape_t *tape;
idetape_pc_t pc;
-
+ int retval;
+
#if IDETAPE_DEBUG_LOG
printk(KERN_INFO "ide-tape: Reached idetape_chrdev_open\n");
#endif /* IDETAPE_DEBUG_LOG */
@@ -5551,11 +5652,7 @@

if (test_and_set_bit(IDETAPE_BUSY, &tape->flags))
return -EBUSY;
- if (!tape->onstream) {
- idetape_read_position(drive);
- if (!test_bit(IDETAPE_ADDRESS_VALID, &tape->flags))
- (void) idetape_rewind_tape(drive);
- } else {
+ if (tape->onstream) {
if (minor & 64) {
tape->tape_block_size = tape->stage_size = 32768 + 512;
tape->raw = 1;
@@ -5565,16 +5662,40 @@
}
idetape_onstream_mode_sense_tape_parameter_page(drive, tape->debug_level);
}
- if (idetape_wait_ready(drive, 60 * HZ)) {
+
+ /* See if the drive is ready to go */
+ if ((retval = idetape_wait_ready(drive, 60 * HZ))) {
clear_bit(IDETAPE_BUSY, &tape->flags);
printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name);
- return -EBUSY;
+ return retval;
}
- if (tape->onstream)
- idetape_read_position(drive);
+
+ /* Read the tape position */
+ idetape_read_position(drive);
+ if (!test_bit(IDETAPE_ADDRESS_VALID, &tape->flags))
+ (void) idetape_rewind_tape(drive);
+
if (tape->chrdev_direction != idetape_direction_read)
clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags);

+ /* Read block size and write protect status from drive */
+ idetape_get_blocksize_from_block_descriptor(drive);
+
+ /* Set write protect flag if device is opened as read-only */
+ if ( (filp->f_flags & O_ACCMODE)==O_RDONLY)
+ tape->write_prot = 1;
+ else tape->write_prot = tape->drv_write_prot;
+
+ /* Make sure drive isn't write protected if user wants to write */
+ if (tape->write_prot)
+ if ( (filp->f_flags & O_ACCMODE)==O_WRONLY ||
+ (filp->f_flags & O_ACCMODE)==O_RDWR) {
+ clear_bit (IDETAPE_BUSY, &tape->flags);
+ return -EROFS;
+ }
+
+ /* Lock the tape drive door so user can't eject */
+ /* (and analyze headers for OnStream drives) */
if (tape->chrdev_direction == idetape_direction_none) {
if (idetape_create_prevent_cmd(drive, &pc, 1)) {
if (!idetape_queue_pc_tail(drive, &pc)) {
@@ -5613,7 +5734,7 @@
*/
static int idetape_chrdev_release (struct inode *inode, struct file *filp)
{
- ide_drive_t *drive = filp->private_data;
+ ide_drive_t *drive = idetape_chrdevs[iminor(inode)&~0xC0].drive;
idetape_tape_t *tape;
idetape_pc_t pc;
unsigned int minor = iminor(inode);
@@ -5637,7 +5758,7 @@
__idetape_kfree_stage(tape->cache_stage);
tape->cache_stage = NULL;
}
- if (minor < 128)
+ if ((minor < 128) && (test_bit(IDETAPE_MEDIUM_PRESENT,&tape->flags)))
(void) idetape_rewind_tape(drive);
if (tape->chrdev_direction == idetape_direction_none) {
if (tape->door_locked == DOOR_LOCKED) {
@@ -6058,6 +6179,8 @@
header = (idetape_mode_parameter_header_t *) pc.buffer;
block_descrp = (idetape_parameter_block_descriptor_t *) (pc.buffer + sizeof(idetape_mode_parameter_header_t));
tape->tape_block_size =( block_descrp->length[0]<<16) + (block_descrp->length[1]<<8) + block_descrp->length[2];
+ tape->drv_write_prot = tape->write_prot = (header->dsp & 0x80) >> 7;
+
#if IDETAPE_DEBUG_INFO
printk(KERN_INFO "ide-tape: Adjusted block size - %d\n", tape->tape_block_size);
#endif /* IDETAPE_DEBUG_INFO */
@@ -6137,6 +6260,9 @@
drive->dsc_overlap = 0;
}
}
+ /* Seagate Travan drives do not support DSC overlap */
+ if (strstr(drive->id->model,"Seagate STT3401"))
+ drive->dsc_overlap = 0;
#endif /* CONFIG_BLK_DEV_IDEPCI */
tape->drive = drive;
tape->minor = minor;



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