int ftape_abort_operation(void)
{
int result = 0;
int status;
TRACE_FUN(ft_t_flow);
if (ft_runner_status == running) {
TRACE(ft_t_noise, "aborting runner, waiting");
ft_runner_status = do_abort;
/* set timeout so that the tape will run to logical EOT
* if we missed the last sector and there are no queue pulses.
*/
result = ftape_dumb_stop();
}
if (ft_runner_status != idle) {
if (ft_runner_status == do_abort) {
TRACE(ft_t_noise, "forcing runner abort");
}
TRACE(ft_t_noise, "stopping tape");
result = ftape_stop_tape(&status);
ft_location.known = 0;
ft_runner_status = idle;
}
ftape_reset_buffer();
ftape_zap_read_buffers();
ftape_set_state(idle);
TRACE_EXIT result;
}
static int ftape_new_cartridge(void)
{
ft_location.track = -1; /* force seek on first access */
ftape_zap_read_buffers();
ftape_zap_write_buffers();
return 0;
}
int ftape_new_cartridge(void)
{
location.track = -1; /* force seek on first access */
first_data_segment = -1; /* unknown */
ftape_zap_read_buffers();
ftape_zap_write_buffers();
ftape_reset_position();
return 0;
}
int ftape_set_nr_buffers(int cnt)
{
int delta = cnt - ft_nr_buffers;
TRACE_FUN(ft_t_flow);
if (delta > 0) {
while (delta--) {
if (add_one_buffer() < 0) {
TRACE_EXIT -ENOMEM;
}
}
} else if (delta < 0) {
while (delta++) {
del_one_buffer();
}
}
ftape_zap_read_buffers();
TRACE_EXIT 0;
}
static void zft_init_driver(void)
{
TRACE_FUN(ft_t_flow);
zft_resid =
zft_header_read =
zft_old_ftape =
zft_offline =
zft_write_protected =
going_offline =
zft_mt_compression =
zft_header_changed =
zft_volume_table_changed =
zft_written_segments = 0;
zft_blk_sz = CONFIG_ZFT_DFLT_BLK_SZ;
zft_reset_position(&zft_pos); /* does most of the stuff */
ftape_zap_read_buffers();
ftape_set_state(idle);
TRACE_EXIT;
}
/* RELEASE routine called by kernel-interface code
*/
int _ftape_close(void)
{
TRACE_FUN(8, "_ftape_close");
int result = 0;
int last_segment = 0;
if (!ftape_offline) {
result = ftape_flush_buffers();
last_segment = ftape_seg_pos - 1;
if (!(ftape_unit & FTAPE_NO_REWIND)) {
if (result >= 0) {
result = ftape_update_header_segments(NULL, 1);
if (result < 0) {
TRACE(1, "error: update of header segments failed");
}
} else {
TRACE(1, "error: unable to update header segments");
}
}
ftape_abort_operation();
if (!(ftape_unit & FTAPE_NO_REWIND)) {
if (!no_tape) {
TRACE(5, "rewinding tape");
result = ftape_seek_to_bot();
}
ftape_reset_position();
ftape_zap_read_buffers();
ftape_zap_write_buffers();
}
}
ftape_detach_drive();
fdc_uninit();
if (history.used) {
TRACE(3, "== Non-fatal errors this run: ==");
TRACE(3, "fdc isr statistics:");
TRACEi(3, " id_am_errors :", history.id_am_errors);
TRACEi(3, " id_crc_errors :", history.id_crc_errors);
TRACEi(3, " data_am_errors :", history.data_am_errors);
TRACEi(3, " data_crc_errors :", history.data_crc_errors);
TRACEi(3, " overrun_errors :", history.overrun_errors);
TRACEi(3, " no_data_errors :", history.no_data_errors);
TRACEi(3, " retries :", history.retries);
if (history.used & 1) {
TRACE(3, "ecc statistics:");
TRACEi(3, " crc_errors :", history.crc_errors);
TRACEi(3, " crc_failures :", history.crc_failures);
TRACEi(3, " ecc_failures :", history.ecc_failures);
TRACEi(3, " sectors corrected:", history.corrected);
}
TRACEx2(3, "media defects : %d%s", history.defects,
history.defects ? " !!!" : "");
TRACEi(3, "repositions :", history.rewinds);
TRACEi(3, "last segment :", last_segment);
}
if (going_offline) {
going_offline = 0;
ftape_offline = 1;
}
TRACE_EXIT;
return result;
}
/* Write given segment from buffer at address onto tape.
*/
int write_segment(unsigned segment_id, byte * address, int flushing)
{
TRACE_FUN(5, "write_segment");
int result = 0;
int bytes_written = 0;
TRACEi(5, "segment_id =", segment_id);
if (ftape_state != writing) {
if (ftape_state == reading) {
TRACE(5, "calling ftape_abort_operation");
result = ftape_abort_operation();
if (result < 0) {
TRACE(1, "ftape_abort_operation failed");
}
}
ftape_zap_read_buffers();
ftape_zap_write_buffers();
ftape_state = writing;
}
/* if all buffers full we'll have to wait...
*/
wait_segment(writing);
if (buffer[tail].status == error) {
/* setup for a retry
*/
buffer[tail].status = waiting;
bytes_written = -EAGAIN; /* force retry */
if (buffer[tail].hard_error_map != 0) {
TRACEx1(1, "warning: %d hard error(s) in written segment",
count_ones(buffer[tail].hard_error_map));
TRACEx1(4, "hard_error_map = 0x%08lx", buffer[tail].hard_error_map);
/* Implement hard write error recovery here
*/
}
} else if (buffer[tail].status == done) {
history.defects += count_ones(buffer[tail].hard_error_map);
} else {
TRACE(1, "wait for empty segment failed");
result = -EIO;
}
/* If just passed last segment on tape: wait for BOT or EOT mark.
*/
if (result >= 0 && runner_status == logical_eot) {
int status;
result = ftape_ready_wait(timeout.seek, &status);
if (result < 0 || (status & (QIC_STATUS_AT_BOT | QIC_STATUS_AT_EOT)) == 0) {
TRACE(1, "eot/bot not reached");
} else {
runner_status = end_of_tape;
}
}
/* should runner stop ?
*/
if (result >= 0 &&
(runner_status == aborting || runner_status == buffer_underrun ||
runner_status == end_of_tape)) {
if (runner_status != end_of_tape) {
result = ftape_dumb_stop();
}
if (result >= 0) {
if (runner_status == aborting) {
if (buffer[head].status == writing) {
buffer[head].status = done; /* ????? */
}
}
runner_status = idle; /* aborted ? */
}
}
/* Don't start tape if runner idle and segment empty.
*/
if (result >= 0 && !(runner_status == idle &&
get_bad_sector_entry(segment_id) == EMPTY_SEGMENT)) {
if (buffer[tail].status == done) {
/* now at least one buffer is empty, fill it with our data.
* skip bad sectors and generate ecc.
* copy_and_gen_ecc return nr of bytes written,
* range 0..29 Kb inclusive !
*/
result = copy_and_gen_ecc(buffer[tail].address, address,
get_bad_sector_entry(segment_id));
if (result >= 0) {
bytes_written = result;
buffer[tail].segment_id = segment_id;
buffer[tail].status = waiting;
next_buffer(&tail);
}
}
/* Start tape only if all buffers full or flush mode.
* This will give higher probability of streaming.
*/
if (result >= 0 && runner_status != running &&
((head == tail && buffer[tail].status == waiting) || flushing)) {
result = start_writing(WRITE_MULTI);
}
}
TRACE_EXIT;
return (result < 0) ? result : bytes_written;
}