/* IOCTL routine called by kernel-interface code
*/
int _ftape_ioctl(unsigned int command, void *arg)
{
TRACE_FUN(8, "ftape_ioctl");
int result = EINVAL;
union {
struct mtop mtop;
struct mtget mtget;
} krnl_arg;
int arg_size = (command & IOCSIZE_MASK) >> IOCSIZE_SHIFT;
/* This check will only catch arguments that are too large !
*/
if ((command & IOC_INOUT) && arg_size > sizeof(krnl_arg)) {
TRACEi(1, "bad argument size:", arg_size);
TRACE_EXIT;
return -EINVAL;
}
if (command & IOC_IN) {
int error = verify_area(VERIFY_READ, arg, arg_size);
if (error) {
TRACE_EXIT;
return error;
}
memcpy_fromfs(&krnl_arg.mtop, arg, arg_size);
}
TRACEx1(5, "called with ioctl command: 0x%08x", command);
switch (command) {
/* cpio compatibility
* mtrasx and mtreset are mt extension by Hennus Bergman
* mtseek and mttell are mt extension by eddy olk
*/
case MTIOCTOP:
TRACEx1(5, "calling MTIOCTOP command: 0x%08x", krnl_arg.mtop.mt_op);
switch (krnl_arg.mtop.mt_op) {
case MTNOP:
/* gnu mt calls MTNOP before MTIOCGET to set status */
result = 0;
break;
case MTRESET:
result = ftape_reset_drive();
init_drive_needed = 1;
if (result < 0 || ftape_offline) {
break;
}
result = ftape_seek_to_bot();
ftape_reset_position();
break;
case MTREW:
case MTOFFL:
if (ftape_offline) {
result = -EIO;
break;
}
ftape_flush_buffers();
ftape_update_header_segments(NULL, 1);
result = ftape_seek_to_bot();
ftape_reset_position();
if (krnl_arg.mtop.mt_op == MTOFFL) {
going_offline = 1;
TRACE(4, "Putting tape drive offline");
}
result = 0;
break;
case MTRETEN:
if (ftape_offline) {
result = -EIO;
break;
}
result = ftape_seek_to_eot();
if (result >= 0) {
result = ftape_seek_to_bot();
}
ftape_reset_position();
break;
case MTERASE:
if (ftape_offline) {
result = -EIO;
break;
}
result = ftape_erase();
break;
case MTEOM:
if (ftape_offline) {
result = -EIO;
break;
}
result = ftape_seek_eom();
break;
case MTFSFM:
if (ftape_offline) {
result = -EIO;
break;
}
eof_mark = 1; /* position ready to extend */
case MTFSF:
if (ftape_offline) {
result = -EIO;
break;
}
result = ftape_seek_eof(krnl_arg.mtop.mt_count);
break;
case MTBSFM:
if (ftape_offline) {
result = -EIO;
break;
}
eof_mark = 1; /* position ready to extend */
case MTBSF:
if (ftape_offline) {
result = -EIO;
break;
}
result = ftape_seek_eof(-krnl_arg.mtop.mt_count);
break;
case MTFSR:
if (ftape_offline) {
result = -EIO;
break;
}
tracing = krnl_arg.mtop.mt_count;
TRACEx1(2, "tracing set to %d", tracing);
result = 0;
break;
case MTBSR:
if (ftape_offline) {
result = -EIO;
break;
}
#if 0
result = ftape_fix();
#else
result = 0;
#endif
break;
case MTWEOF:
if (ftape_offline) {
result = -EIO;
break;
}
result = ftape_weof(krnl_arg.mtop.mt_count, ftape_seg_pos, 1);
if (result >= 0) {
ftape_seg_pos += krnl_arg.mtop.mt_count - 1;
}
break;
/* MTRASx and MTRESET are mt extension by Hennus Bergman
*/
case MTRAS1:
case MTRAS2:
case MTRAS3:
case MTSEEK:
case MTTELL:
default:
TRACEi(1, "MTIOCTOP sub-command not implemented:", krnl_arg.mtop.mt_op);
result = -EIO;
break;
}
break;
case MTIOCGET:
krnl_arg.mtget.mt_type = drive_type.vendor_id + 0x800000;
krnl_arg.mtget.mt_resid = 0; /* not implemented */
krnl_arg.mtget.mt_dsreg = 0; /* status register */
krnl_arg.mtget.mt_gstat = /* device independent status */
((ftape_offline) ? 0 : GMT_ONLINE(-1L)) |
((write_protected) ? GMT_WR_PROT(-1L) : 0) |
((no_tape) ? GMT_DR_OPEN(-1L) : 0);
krnl_arg.mtget.mt_erreg = ftape_last_error; /* error register */
result = ftape_file_no(&krnl_arg.mtget.mt_fileno,
&krnl_arg.mtget.mt_blkno);
break;
case MTIOCPOS:
TRACE(5, "Mag tape ioctl command: MTIOCPOS");
TRACE(1, "MTIOCPOS command not implemented");
break;
default:
result = -EINVAL;
break;
}
if (command & IOC_OUT) {
int error = verify_area(VERIFY_WRITE, arg, arg_size);
if (error) {
TRACE_EXIT;
return error;
}
memcpy_tofs(arg, &krnl_arg, arg_size);
}
TRACE_EXIT;
return result;
}
void ftape_calc_timeouts(unsigned int qic_std,
unsigned int data_rate,
unsigned int tape_len)
{
int speed; /* deci-ips ! */
int ff_speed;
int length;
TRACE_FUN(ft_t_any);
/* tape transport speed
* data rate: QIC-40 QIC-80 QIC-3010 QIC-3020
*
* 250 Kbps 25 ips n/a n/a n/a
* 500 Kbps 50 ips 34 ips 22.6 ips n/a
* 1 Mbps n/a 68 ips 45.2 ips 22.6 ips
* 2 Mbps n/a n/a n/a 45.2 ips
*
* fast tape transport speed is at least 68 ips.
*/
switch (qic_std) {
case QIC_TAPE_QIC40:
speed = (data_rate == 250) ? 250 : 500;
break;
case QIC_TAPE_QIC80:
speed = (data_rate == 500) ? 340 : 680;
break;
case QIC_TAPE_QIC3010:
speed = (data_rate == 500) ? 226 : 452;
break;
case QIC_TAPE_QIC3020:
speed = (data_rate == 1000) ? 226 : 452;
break;
default:
TRACE(ft_t_bug, "Unknown qic_std (bug) ?");
speed = 500;
break;
}
if (ft_drive_type.speed == 0) {
unsigned long t0;
static int dt = 0; /* keep gcc from complaining */
static int first_time = 1;
/* Measure the time it takes to wind to EOT and back to BOT.
* If the tape length is known, calculate the rewind speed.
* Else keep the time value for calculation of the rewind
* speed later on, when the length _is_ known.
* Ask for a report only when length and speed are both known.
*/
if (first_time) {
ftape_seek_to_bot();
t0 = jiffies;
ftape_seek_to_eot();
ftape_seek_to_bot();
dt = (int) (((jiffies - t0) * FT_USPT) / 1000);
if (dt < 1) {
dt = 1; /* prevent div by zero on failures */
}
first_time = 0;
TRACE(ft_t_info,
"trying to determine seek timeout, got %d msec",
dt);
}
if (tape_len != 0) {
ft_drive_type.speed =
(2 * 12 * tape_len * 1000) / dt;
TRACE(ft_t_warn, "\n"
KERN_INFO "==========================================\n"
KERN_INFO "drive type: %s\n"
KERN_INFO "delta time = %d ms, length = %d ft\n"
KERN_INFO "has a maximum tape speed of %d ips\n"
KERN_INFO "please report this to "THE_FTAPE_MAINTAINER"\n"
KERN_INFO "==========================================",
ft_drive_type.name, dt, tape_len,
ft_drive_type.speed);
}
}
/* Handle unknown length tapes as very long ones. We'll
* determine the actual length from a header segment later.
* This is normal for all modern (Wide,TR1/2/3) formats.
*/
if (tape_len <= 0) {
TRACE(ft_t_noise,
"Unknown tape length, using maximal timeouts");
length = QIC_TOP_TAPE_LEN; /* use worst case values */
} else {
length = tape_len; /* use actual values */
}
if (ft_drive_type.speed == 0) {
ff_speed = speed;
} else {
ff_speed = ft_drive_type.speed;
}
/* time to go from bot to eot at normal speed (data rate):
* time = (1+delta) * length (ft) * 12 (inch/ft) / speed (ips)
* delta = 10 % for seek speed, 20 % for rewind speed.
*/
ftape_timeout.seek = (length * 132 * FT_SECOND) / speed;
ftape_timeout.rewind = (length * 144 * FT_SECOND) / (10 * ff_speed);
ftape_timeout.reset = 20 * FT_SECOND + ftape_timeout.rewind;
TRACE(ft_t_noise, "timeouts for speed = %d, length = %d\n"
KERN_INFO "seek timeout : %d sec\n"
KERN_INFO "rewind timeout: %d sec\n"
KERN_INFO "reset timeout : %d sec",
speed, length,
(ftape_timeout.seek + 500) / 1000,
(ftape_timeout.rewind + 500) / 1000,
(ftape_timeout.reset + 500) / 1000);
TRACE_EXIT;
}
void ftape_calc_timeouts(void)
{
TRACE_FUN(8, "ftape_calc_timeouts");
int speed; /* deci-ips ! */
int length;
/* tape transport speed
* data rate: QIC-40 QIC-80 QIC-3010 QIC-3020
*
* 250 Kbps 25 ips n/a n/a n/a
* 500 Kbps 50 ips 34 ips 22.6 ips n/a
* 1 Mbps n/a 68 ips 45.2 ips 22.6 ips
* 2 Mbps n/a n/a n/a 45.2 ips
*
* fast tape transport speed is at least 68 ips.
*/
switch (qic_std) {
case QIC_TAPE_QIC40:
speed = (ftape_data_rate == 3) ? 250 : 500;
break;
case QIC_TAPE_QIC80:
speed = (ftape_data_rate == 2) ? 340 : 680;
break;
case QIC_TAPE_QIC3010:
speed = (ftape_data_rate == 2) ? 226 : 452;
break;
case QIC_TAPE_QIC3020:
speed = (ftape_data_rate == 1) ? 226 : 452;
break;
default:
TRACE(-1, "Unknown qic_std (bug) ?");
speed = 500;
break;
}
if (tape_len <= 0) {
/* Handle unknown length tapes as 1100 ft ones (worst case)
*/
TRACE(1, "Unknown tape length, using worst case timing values!");
length = 1100;
} else {
length = tape_len;
}
if (drive_type.speed == 0) {
unsigned long t0;
int dt;
ftape_seek_to_bot();
t0 = jiffies;
ftape_seek_to_eot();
ftape_seek_to_bot();
dt = (int) ((jiffies - t0) * MSPT);
drive_type.speed = (2 * 12 * length * 1000) / dt;
TRACE(-1, "==========================================");
TRACEx1(-1, "drive : %s", drive_type.name);
TRACEx2(-1, "delta time = %d, length = %d", dt, length);
TRACEx1(-1, "has max tape speed of %d ips", drive_type.speed);
TRACE(-1, "please report this to <*****@*****.**>");
TRACE(-1, "==========================================");
}
/* time to go from bot to eot at normal speed (data rate):
* time = (1+delta) * length (ft) * 12 (inch/ft) / speed (ips)
* delta = 10 % for seek speed, 20 % for rewind speed.
*/
timeout.seek = (length * 132 * SECOND) / speed;
timeout.rewind = (length * 144 * SECOND) / (10 * drive_type.speed);
timeout.reset = 20 * SECOND + timeout.rewind;
TRACEx2(4, "speed = %d, length = %d", speed, length);
TRACEx1(4, "seek timeout: %d sec", (timeout.seek + 500) / 1000);
TRACEx1(4, "rewind timeout: %d sec", (timeout.rewind + 500) / 1000);
TRACE_EXIT;
}
