622 lines
18 KiB
C
622 lines
18 KiB
C
/*
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* Copyright (C) 1993-1996 Bas Laarhoven,
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* (C) 1996-1997 Claus-Justus Heine.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* $Source: /homes/cvs/ftape-stacked/ftape/lowlevel/ftape-read.c,v $
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* $Revision: 1.6 $
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* $Date: 1997/10/21 14:39:22 $
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*
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* This file contains the reading code
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* for the QIC-117 floppy-tape driver for Linux.
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*
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*/
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/mm.h>
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#include <linux/ftape.h>
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#include <linux/qic117.h>
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#include "../lowlevel/ftape-tracing.h"
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#include "../lowlevel/ftape-read.h"
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#include "../lowlevel/ftape-io.h"
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#include "../lowlevel/ftape-ctl.h"
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#include "../lowlevel/ftape-rw.h"
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#include "../lowlevel/ftape-write.h"
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#include "../lowlevel/ftape-ecc.h"
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#include "../lowlevel/ftape-bsm.h"
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/* Global vars.
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*/
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/* Local vars.
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*/
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void ftape_zap_read_buffers(void)
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{
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int i;
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for (i = 0; i < ft_nr_buffers; ++i) {
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/* changed to "fit" with dynamic allocation of tape_buffer. --khp */
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ft_buffer[i]->status = waiting;
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ft_buffer[i]->bytes = 0;
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ft_buffer[i]->skip = 0;
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ft_buffer[i]->retry = 0;
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}
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/* ftape_reset_buffer(); */
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}
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static SectorMap convert_sector_map(buffer_struct * buff)
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{
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int i = 0;
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SectorMap bad_map = ftape_get_bad_sector_entry(buff->segment_id);
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SectorMap src_map = buff->soft_error_map | buff->hard_error_map;
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SectorMap dst_map = 0;
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TRACE_FUN(ft_t_any);
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if (bad_map || src_map) {
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TRACE(ft_t_flow, "bad_map = 0x%08lx", (long) bad_map);
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TRACE(ft_t_flow, "src_map = 0x%08lx", (long) src_map);
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}
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while (bad_map) {
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while ((bad_map & 1) == 0) {
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if (src_map & 1) {
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dst_map |= (1 << i);
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}
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src_map >>= 1;
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bad_map >>= 1;
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++i;
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}
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/* (bad_map & 1) == 1 */
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src_map >>= 1;
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bad_map >>= 1;
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}
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if (src_map) {
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dst_map |= (src_map << i);
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}
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if (dst_map) {
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TRACE(ft_t_flow, "dst_map = 0x%08lx", (long) dst_map);
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}
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TRACE_EXIT dst_map;
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}
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static int correct_and_copy_fraction(buffer_struct *buff, __u8 * destination,
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int start, int size)
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{
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struct memory_segment mseg;
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int result;
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SectorMap read_bad;
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TRACE_FUN(ft_t_any);
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mseg.read_bad = convert_sector_map(buff);
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mseg.marked_bad = 0; /* not used... */
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mseg.blocks = buff->bytes / FT_SECTOR_SIZE;
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mseg.data = buff->address;
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/* If there are no data sectors we can skip this segment.
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*/
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if (mseg.blocks <= 3) {
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TRACE_ABORT(0, ft_t_noise, "empty segment");
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}
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read_bad = mseg.read_bad;
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ft_history.crc_errors += count_ones(read_bad);
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result = ftape_ecc_correct_data(&mseg);
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if (read_bad != 0 || mseg.corrected != 0) {
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TRACE(ft_t_noise, "crc error map: 0x%08lx", (unsigned long)read_bad);
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TRACE(ft_t_noise, "corrected map: 0x%08lx", (unsigned long)mseg.corrected);
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ft_history.corrected += count_ones(mseg.corrected);
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}
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if (result == ECC_CORRECTED || result == ECC_OK) {
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if (result == ECC_CORRECTED) {
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TRACE(ft_t_info, "ecc corrected segment: %d", buff->segment_id);
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}
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if(start < 0) {
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start= 0;
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}
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if((start+size) > ((mseg.blocks - 3) * FT_SECTOR_SIZE)) {
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size = (mseg.blocks - 3) * FT_SECTOR_SIZE - start;
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}
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if (size < 0) {
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size= 0;
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}
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if(size > 0) {
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memcpy(destination + start, mseg.data + start, size);
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}
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if ((read_bad ^ mseg.corrected) & mseg.corrected) {
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/* sectors corrected without crc errors set */
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ft_history.crc_failures++;
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}
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TRACE_EXIT size; /* (mseg.blocks - 3) * FT_SECTOR_SIZE; */
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} else {
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ft_history.ecc_failures++;
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TRACE_ABORT(-EAGAIN,
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ft_t_err, "ecc failure on segment %d",
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buff->segment_id);
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}
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TRACE_EXIT 0;
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}
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/* Read given segment into buffer at address.
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*/
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int ftape_read_segment_fraction(const int segment_id,
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void *address,
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const ft_read_mode_t read_mode,
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const int start,
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const int size)
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{
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int result = 0;
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int retry = 0;
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int bytes_read = 0;
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int read_done = 0;
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TRACE_FUN(ft_t_flow);
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ft_history.used |= 1;
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TRACE(ft_t_data_flow, "segment_id = %d", segment_id);
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if (ft_driver_state != reading) {
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TRACE(ft_t_noise, "calling ftape_abort_operation");
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TRACE_CATCH(ftape_abort_operation(),);
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ftape_set_state(reading);
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}
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for(;;) {
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buffer_struct *tail;
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/* Allow escape from this loop on signal !
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*/
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FT_SIGNAL_EXIT(_DONT_BLOCK);
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/* Search all full buffers for the first matching the
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* wanted segment. Clear other buffers on the fly.
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*/
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tail = ftape_get_buffer(ft_queue_tail);
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while (!read_done && tail->status == done) {
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/* Allow escape from this loop on signal !
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*/
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FT_SIGNAL_EXIT(_DONT_BLOCK);
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if (tail->segment_id == segment_id) {
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/* If out buffer is already full,
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* return its contents.
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*/
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TRACE(ft_t_flow, "found segment in cache: %d",
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segment_id);
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if (tail->deleted) {
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/* Return a value that
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* read_header_segment
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* understands. As this
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* should only occur when
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* searching for the header
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* segments it shouldn't be
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* misinterpreted elsewhere.
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*/
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TRACE_EXIT 0;
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}
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result = correct_and_copy_fraction(
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tail,
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address,
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start,
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size);
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TRACE(ft_t_flow, "segment contains (bytes): %d",
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result);
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if (result < 0) {
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if (result != -EAGAIN) {
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TRACE_EXIT result;
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}
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/* keep read_done == 0, will
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* trigger
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* ftape_abort_operation
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* because reading wrong
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* segment.
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*/
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TRACE(ft_t_err, "ecc failed, retry");
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++retry;
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} else {
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read_done = 1;
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bytes_read = result;
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}
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} else {
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TRACE(ft_t_flow,"zapping segment in cache: %d",
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tail->segment_id);
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}
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tail->status = waiting;
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tail = ftape_next_buffer(ft_queue_tail);
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}
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if (!read_done && tail->status == reading) {
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if (tail->segment_id == segment_id) {
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switch(ftape_wait_segment(reading)) {
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case 0:
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break;
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case -EINTR:
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TRACE_ABORT(-EINTR, ft_t_warn,
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"interrupted by "
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"non-blockable signal");
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break;
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default:
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TRACE(ft_t_noise,
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"wait_segment failed");
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ftape_abort_operation();
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ftape_set_state(reading);
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break;
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}
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} else {
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/* We're reading the wrong segment,
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* stop runner.
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*/
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TRACE(ft_t_noise, "reading wrong segment");
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ftape_abort_operation();
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ftape_set_state(reading);
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}
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}
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/* should runner stop ?
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*/
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if (ft_runner_status == aborting) {
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buffer_struct *head = ftape_get_buffer(ft_queue_head);
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switch(head->status) {
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case error:
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ft_history.defects +=
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count_ones(head->hard_error_map);
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case reading:
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head->status = waiting;
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break;
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default:
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break;
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}
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TRACE_CATCH(ftape_dumb_stop(),);
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} else {
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/* If just passed last segment on tape: wait
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* for BOT or EOT mark. Sets ft_runner_status to
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* idle if at lEOT and successful
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*/
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TRACE_CATCH(ftape_handle_logical_eot(),);
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}
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/* If we got a segment: quit, or else retry up to limit.
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*
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* If segment to read is empty, do not start runner for it,
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* but wait for next read call.
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*/
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if (read_done ||
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ftape_get_bad_sector_entry(segment_id) == EMPTY_SEGMENT ) {
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/* bytes_read = 0; should still be zero */
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TRACE_EXIT bytes_read;
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}
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if (retry > FT_RETRIES_ON_ECC_ERROR) {
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ft_history.defects++;
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TRACE_ABORT(-ENODATA, ft_t_err,
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"too many retries on ecc failure");
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}
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/* Now at least one buffer is empty !
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* Restart runner & tape if needed.
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*/
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TRACE(ft_t_any, "head: %d, tail: %d, ft_runner_status: %d",
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ftape_buffer_id(ft_queue_head),
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ftape_buffer_id(ft_queue_tail),
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ft_runner_status);
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TRACE(ft_t_any, "buffer[].status, [head]: %d, [tail]: %d",
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ftape_get_buffer(ft_queue_head)->status,
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ftape_get_buffer(ft_queue_tail)->status);
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tail = ftape_get_buffer(ft_queue_tail);
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if (tail->status == waiting) {
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buffer_struct *head = ftape_get_buffer(ft_queue_head);
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ftape_setup_new_segment(head, segment_id, -1);
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if (read_mode == FT_RD_SINGLE) {
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/* disable read-ahead */
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head->next_segment = 0;
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}
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ftape_calc_next_cluster(head);
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if (ft_runner_status == idle) {
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result = ftape_start_tape(segment_id,
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head->sector_offset);
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if (result < 0) {
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TRACE_ABORT(result, ft_t_err, "Error: "
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"segment %d unreachable",
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segment_id);
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}
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}
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head->status = reading;
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fdc_setup_read_write(head, FDC_READ);
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}
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}
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/* not reached */
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TRACE_EXIT -EIO;
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}
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int ftape_read_header_segment(__u8 *address)
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{
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int result;
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int header_segment;
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int first_failed = 0;
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int status;
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TRACE_FUN(ft_t_flow);
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ft_used_header_segment = -1;
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TRACE_CATCH(ftape_report_drive_status(&status),);
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TRACE(ft_t_flow, "reading...");
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/* We're looking for the first header segment.
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* A header segment cannot contain bad sectors, therefor at the
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* tape start, segments with bad sectors are (according to QIC-40/80)
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* written with deleted data marks and must be skipped.
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*/
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memset(address, '\0', (FT_SECTORS_PER_SEGMENT - 3) * FT_SECTOR_SIZE);
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result = 0;
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#define HEADER_SEGMENT_BOUNDARY 68 /* why not 42? */
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for (header_segment = 0;
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header_segment < HEADER_SEGMENT_BOUNDARY && result == 0;
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++header_segment) {
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/* Set no read-ahead, the isr will force read-ahead whenever
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* it encounters deleted data !
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*/
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result = ftape_read_segment(header_segment,
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address,
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FT_RD_SINGLE);
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if (result < 0 && !first_failed) {
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TRACE(ft_t_err, "header segment damaged, trying backup");
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first_failed = 1;
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result = 0; /* force read of next (backup) segment */
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}
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}
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if (result < 0 || header_segment >= HEADER_SEGMENT_BOUNDARY) {
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TRACE_ABORT(-EIO, ft_t_err,
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"no readable header segment found");
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}
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TRACE_CATCH(ftape_abort_operation(),);
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ft_used_header_segment = header_segment;
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result = ftape_decode_header_segment(address);
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TRACE_EXIT result;
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}
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int ftape_decode_header_segment(__u8 *address)
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{
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unsigned int max_floppy_side;
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unsigned int max_floppy_track;
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unsigned int max_floppy_sector;
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unsigned int new_tape_len;
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TRACE_FUN(ft_t_flow);
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if (GET4(address, FT_SIGNATURE) == FT_D2G_MAGIC) {
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/* Ditto 2GB header segment. They encrypt the bad sector map.
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* We decrypt it and store them in normal format.
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* I hope this is correct.
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*/
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int i;
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TRACE(ft_t_warn,
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"Found Ditto 2GB tape, "
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"trying to decrypt bad sector map");
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for (i=256; i < 29 * FT_SECTOR_SIZE; i++) {
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address[i] = ~(address[i] - (i&0xff));
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}
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PUT4(address, 0,FT_HSEG_MAGIC);
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} else if (GET4(address, FT_SIGNATURE) != FT_HSEG_MAGIC) {
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TRACE_ABORT(-EIO, ft_t_err,
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"wrong signature in header segment");
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}
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ft_format_code = (ft_format_type) address[FT_FMT_CODE];
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if (ft_format_code != fmt_big) {
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ft_header_segment_1 = GET2(address, FT_HSEG_1);
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ft_header_segment_2 = GET2(address, FT_HSEG_2);
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ft_first_data_segment = GET2(address, FT_FRST_SEG);
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ft_last_data_segment = GET2(address, FT_LAST_SEG);
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} else {
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ft_header_segment_1 = GET4(address, FT_6_HSEG_1);
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ft_header_segment_2 = GET4(address, FT_6_HSEG_2);
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ft_first_data_segment = GET4(address, FT_6_FRST_SEG);
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ft_last_data_segment = GET4(address, FT_6_LAST_SEG);
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}
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TRACE(ft_t_noise, "first data segment: %d", ft_first_data_segment);
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TRACE(ft_t_noise, "last data segment: %d", ft_last_data_segment);
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TRACE(ft_t_noise, "header segments are %d and %d",
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ft_header_segment_1, ft_header_segment_2);
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/* Verify tape parameters...
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* QIC-40/80 spec: tape_parameters:
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*
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* segments-per-track segments_per_track
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* tracks-per-cartridge tracks_per_tape
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* max-floppy-side (segments_per_track *
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* tracks_per_tape - 1) /
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* ftape_segments_per_head
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* max-floppy-track ftape_segments_per_head /
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* ftape_segments_per_cylinder - 1
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* max-floppy-sector ftape_segments_per_cylinder *
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* FT_SECTORS_PER_SEGMENT
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*/
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ft_segments_per_track = GET2(address, FT_SPT);
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ft_tracks_per_tape = address[FT_TPC];
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max_floppy_side = address[FT_FHM];
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max_floppy_track = address[FT_FTM];
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max_floppy_sector = address[FT_FSM];
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TRACE(ft_t_noise, "(fmt/spt/tpc/fhm/ftm/fsm) = %d/%d/%d/%d/%d/%d",
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ft_format_code, ft_segments_per_track, ft_tracks_per_tape,
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max_floppy_side, max_floppy_track, max_floppy_sector);
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new_tape_len = ftape_tape_len;
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switch (ft_format_code) {
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case fmt_425ft:
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new_tape_len = 425;
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break;
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case fmt_normal:
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if (ftape_tape_len == 0) { /* otherwise 307 ft */
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new_tape_len = 205;
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}
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break;
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case fmt_1100ft:
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new_tape_len = 1100;
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break;
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case fmt_var:{
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int segments_per_1000_inch = 1; /* non-zero default for switch */
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switch (ft_qic_std) {
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case QIC_TAPE_QIC40:
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segments_per_1000_inch = 332;
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break;
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case QIC_TAPE_QIC80:
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segments_per_1000_inch = 488;
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break;
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case QIC_TAPE_QIC3010:
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segments_per_1000_inch = 730;
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break;
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case QIC_TAPE_QIC3020:
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segments_per_1000_inch = 1430;
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break;
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}
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new_tape_len = (1000 * ft_segments_per_track +
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(segments_per_1000_inch - 1)) / segments_per_1000_inch;
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break;
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}
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case fmt_big:{
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int segments_per_1000_inch = 1; /* non-zero default for switch */
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switch (ft_qic_std) {
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case QIC_TAPE_QIC40:
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segments_per_1000_inch = 332;
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break;
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case QIC_TAPE_QIC80:
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segments_per_1000_inch = 488;
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break;
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case QIC_TAPE_QIC3010:
|
|
segments_per_1000_inch = 730;
|
|
break;
|
|
case QIC_TAPE_QIC3020:
|
|
segments_per_1000_inch = 1430;
|
|
break;
|
|
default:
|
|
TRACE_ABORT(-EIO, ft_t_bug,
|
|
"%x QIC-standard with fmt-code %d, please report",
|
|
ft_qic_std, ft_format_code);
|
|
}
|
|
new_tape_len = ((1000 * ft_segments_per_track +
|
|
(segments_per_1000_inch - 1)) /
|
|
segments_per_1000_inch);
|
|
break;
|
|
}
|
|
default:
|
|
TRACE_ABORT(-EIO, ft_t_err,
|
|
"unknown tape format, please report !");
|
|
}
|
|
if (new_tape_len != ftape_tape_len) {
|
|
ftape_tape_len = new_tape_len;
|
|
TRACE(ft_t_info, "calculated tape length is %d ft",
|
|
ftape_tape_len);
|
|
ftape_calc_timeouts(ft_qic_std, ft_data_rate, ftape_tape_len);
|
|
}
|
|
if (ft_segments_per_track == 0 && ft_tracks_per_tape == 0 &&
|
|
max_floppy_side == 0 && max_floppy_track == 0 &&
|
|
max_floppy_sector == 0) {
|
|
/* QIC-40 Rev E and earlier has no values in the header.
|
|
*/
|
|
ft_segments_per_track = 68;
|
|
ft_tracks_per_tape = 20;
|
|
max_floppy_side = 1;
|
|
max_floppy_track = 169;
|
|
max_floppy_sector = 128;
|
|
}
|
|
/* This test will compensate for the wrong parameter on tapes
|
|
* formatted by Conner software.
|
|
*/
|
|
if (ft_segments_per_track == 150 &&
|
|
ft_tracks_per_tape == 28 &&
|
|
max_floppy_side == 7 &&
|
|
max_floppy_track == 149 &&
|
|
max_floppy_sector == 128) {
|
|
TRACE(ft_t_info, "the famous CONNER bug: max_floppy_side off by one !");
|
|
max_floppy_side = 6;
|
|
}
|
|
/* These tests will compensate for the wrong parameter on tapes
|
|
* formatted by ComByte Windows software.
|
|
*
|
|
* First, for 205 foot tapes
|
|
*/
|
|
if (ft_segments_per_track == 100 &&
|
|
ft_tracks_per_tape == 28 &&
|
|
max_floppy_side == 9 &&
|
|
max_floppy_track == 149 &&
|
|
max_floppy_sector == 128) {
|
|
TRACE(ft_t_info, "the ComByte bug: max_floppy_side incorrect!");
|
|
max_floppy_side = 4;
|
|
}
|
|
/* Next, for 307 foot tapes. */
|
|
if (ft_segments_per_track == 150 &&
|
|
ft_tracks_per_tape == 28 &&
|
|
max_floppy_side == 9 &&
|
|
max_floppy_track == 149 &&
|
|
max_floppy_sector == 128) {
|
|
TRACE(ft_t_info, "the ComByte bug: max_floppy_side incorrect!");
|
|
max_floppy_side = 6;
|
|
}
|
|
/* This test will compensate for the wrong parameter on tapes
|
|
* formatted by Colorado Windows software.
|
|
*/
|
|
if (ft_segments_per_track == 150 &&
|
|
ft_tracks_per_tape == 28 &&
|
|
max_floppy_side == 6 &&
|
|
max_floppy_track == 150 &&
|
|
max_floppy_sector == 128) {
|
|
TRACE(ft_t_info, "the famous Colorado bug: max_floppy_track off by one !");
|
|
max_floppy_track = 149;
|
|
}
|
|
ftape_segments_per_head = ((max_floppy_sector/FT_SECTORS_PER_SEGMENT) *
|
|
(max_floppy_track + 1));
|
|
/* This test will compensate for some bug reported by Dima
|
|
* Brodsky. Seems to be a Colorado bug, either. (freebee
|
|
* Imation tape shipped together with Colorado T3000
|
|
*/
|
|
if ((ft_format_code == fmt_var || ft_format_code == fmt_big) &&
|
|
ft_tracks_per_tape == 50 &&
|
|
max_floppy_side == 54 &&
|
|
max_floppy_track == 255 &&
|
|
max_floppy_sector == 128) {
|
|
TRACE(ft_t_info, "the famous ??? bug: max_floppy_track off by one !");
|
|
max_floppy_track = 254;
|
|
}
|
|
/*
|
|
* Verify drive_configuration with tape parameters
|
|
*/
|
|
if (ftape_segments_per_head == 0 || ftape_segments_per_cylinder == 0 ||
|
|
((ft_segments_per_track * ft_tracks_per_tape - 1) / ftape_segments_per_head
|
|
!= max_floppy_side) ||
|
|
(ftape_segments_per_head / ftape_segments_per_cylinder - 1 != max_floppy_track) ||
|
|
(ftape_segments_per_cylinder * FT_SECTORS_PER_SEGMENT != max_floppy_sector)
|
|
#ifdef TESTING
|
|
|| ((ft_format_code == fmt_var || ft_format_code == fmt_big) &&
|
|
(max_floppy_track != 254 || max_floppy_sector != 128))
|
|
#endif
|
|
) {
|
|
char segperheadz = ftape_segments_per_head ? ' ' : '?';
|
|
char segpercylz = ftape_segments_per_cylinder ? ' ' : '?';
|
|
TRACE(ft_t_err,"Tape parameters inconsistency, please report");
|
|
TRACE(ft_t_err, "reported = %d/%d/%d/%d/%d/%d",
|
|
ft_format_code,
|
|
ft_segments_per_track,
|
|
ft_tracks_per_tape,
|
|
max_floppy_side,
|
|
max_floppy_track,
|
|
max_floppy_sector);
|
|
TRACE(ft_t_err, "required = %d/%d/%d/%d%c/%d%c/%d",
|
|
ft_format_code,
|
|
ft_segments_per_track,
|
|
ft_tracks_per_tape,
|
|
ftape_segments_per_head ?
|
|
((ft_segments_per_track * ft_tracks_per_tape -1) /
|
|
ftape_segments_per_head ) :
|
|
(ft_segments_per_track * ft_tracks_per_tape -1),
|
|
segperheadz,
|
|
ftape_segments_per_cylinder ?
|
|
(ftape_segments_per_head /
|
|
ftape_segments_per_cylinder - 1 ) :
|
|
ftape_segments_per_head - 1,
|
|
segpercylz,
|
|
(ftape_segments_per_cylinder * FT_SECTORS_PER_SEGMENT));
|
|
TRACE_EXIT -EIO;
|
|
}
|
|
ftape_extract_bad_sector_map(address);
|
|
TRACE_EXIT 0;
|
|
}
|