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199 |
simons |
/*
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* Copyright (C) 1993-1995 Bas Laarhoven.
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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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$Source: /home/marcus/revision_ctrl_test/oc_cvs/cvs/or1k/uclinux/uClinux-2.0.x/drivers/char/ftape/ftape-read.c,v $
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$Author: simons $
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*
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$Revision: 1.1.1.1 $
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$Date: 2001-09-10 07:44:17 $
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$State: Exp $
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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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#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 <asm/segment.h>
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#include "tracing.h"
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#include "ftape-read.h"
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#include "qic117.h"
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#include "ftape-io.h"
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#include "ftape-ctl.h"
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#include "ftape-rw.h"
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#include "ftape-write.h"
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#include "ftape-eof.h"
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#include "ecc.h"
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#include "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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int buf_pos_rd = 0;
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int buf_len_rd = 0;
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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 < NR_BUFFERS; ++i) {
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/*
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* changed to "fit" with dynamic allocation of tape_buffer. --khp
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*/
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buffer[i].address = tape_buffer[i];
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buffer[i].status = waiting;
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buffer[i].bytes = 0;
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buffer[i].skip = 0;
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buffer[i].retry = 0;
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}
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buf_len_rd = 0;
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buf_pos_rd = 0;
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eof_mark = 0;
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ftape_state = idle;
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}
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static unsigned long convert_sector_map(buffer_struct * buff)
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{
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TRACE_FUN(8, "convert_sector_map");
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int i = 0;
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unsigned long bad_map = get_bad_sector_entry(buff->segment_id);
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unsigned long src_map = buff->soft_error_map | buff->hard_error_map;
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unsigned long dst_map = 0;
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if (bad_map || src_map) {
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TRACEx1(5, "bad_map = 0x%08lx", bad_map);
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TRACEx1(5, "src_map = 0x%08lx", 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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TRACEx1(5, "dst_map = 0x%08lx", dst_map);
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}
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TRACE_EXIT;
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return dst_map;
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}
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int correct_and_copy(unsigned int tail, byte * destination)
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{
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TRACE_FUN(8, "correct_and_copy");
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struct memory_segment mseg;
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int result;
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BAD_SECTOR read_bad;
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mseg.read_bad = convert_sector_map(&buffer[tail]);
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mseg.marked_bad = 0; /* not used... */
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mseg.blocks = buffer[tail].bytes / SECTOR_SIZE;
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mseg.data = buffer[tail].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(4, "empty segment");
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TRACE_EXIT;
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return 0;
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}
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read_bad = mseg.read_bad;
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history.crc_errors += count_ones(read_bad);
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result = ecc_correct_data(&mseg);
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if (read_bad != 0 || mseg.corrected != 0) {
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TRACElx(4, "crc error map:", read_bad);
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TRACElx(4, "corrected map:", mseg.corrected);
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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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TRACEi(3, "ecc corrected segment:", buffer[tail].segment_id);
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}
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memcpy(destination, mseg.data, (mseg.blocks - 3) * SECTOR_SIZE);
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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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history.crc_failures++;
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}
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TRACE_EXIT;
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return (mseg.blocks - 3) * SECTOR_SIZE;
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} else {
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TRACEi(1, "ecc failure on segment", buffer[tail].segment_id);
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history.ecc_failures++;
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TRACE_EXIT;
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return -EAGAIN; /* should retry */
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}
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TRACE_EXIT;
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return 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 read_segment(unsigned segment_id, byte * address, int *eof_mark,
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int read_ahead)
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{
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TRACE_FUN(5, "read_segment");
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int read_done = 0;
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int result = 0;
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int bytes_read = 0;
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int retry = 0;
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TRACEi(5, "segment_id =", segment_id);
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if (ftape_state != reading) {
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if (ftape_state == writing) {
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ftape_flush_buffers(); /* flush write buffer */
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TRACE(5, "calling ftape_abort_operation");
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result = ftape_abort_operation();
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if (result < 0) {
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TRACE(1, "ftape_abort_operation failed");
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TRACE_EXIT;
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return -EIO;
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}
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} else {
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/* clear remaining read buffers */
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ftape_zap_read_buffers();
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}
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ftape_state = reading;
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}
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if (segment_id >= segments_per_track * tracks_per_tape) {
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TRACE(5, "reading past end of tape");
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TRACE_EXIT;
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return -ENOSPC;
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}
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for (;;) {
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/* Search all full buffers for the first matching the wanted segment.
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* Clear other buffers on the fly.
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*/
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while (!read_done && buffer[tail].status == done) {
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if (buffer[tail].segment_id == segment_id) {
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unsigned eof_sector;
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unsigned sector_count = 0;
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unsigned long bsm = get_bad_sector_entry(segment_id);
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int i;
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/* If out buffer is already full, return its contents.
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*/
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if (buffer[tail].deleted) {
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TRACEi(5, "found segment in cache :", segment_id);
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TRACE_EXIT;
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/* Return a value that read_header_segment understands.
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* As this should only occur when searching for the header
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* segments it shouldn't be misinterpreted elsewhere.
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*/
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| 209 |
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return 0;
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}
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TRACEi(5, "found segment in cache :", segment_id);
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eof_sector = check_for_eof(segment_id);
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if (eof_sector > 0) {
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TRACEi(5, "end of file mark in sector:", eof_sector);
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for (i = 1; i < eof_sector; ++i) {
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if ((bsm & 1) == 0) {
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++sector_count;
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}
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bsm >>= 1;
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}
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*eof_mark = 1;
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}
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if (eof_sector != 1) { /* not found or gt 1 */
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result = correct_and_copy(tail, address);
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TRACEi(5, "segment contains (bytes) :", result);
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if (result < 0) {
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if (result != -EAGAIN) {
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TRACE_EXIT;
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return result;
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}
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/* keep read_done == 0, will trigger ftape_abort_operation
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* because reading wrong segment.
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*/
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TRACE(1, "ecc failed, retry");
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++retry;
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} else {
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read_done = 1;
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}
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| 239 |
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} else {
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| 240 |
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read_done = 1;
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| 241 |
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}
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| 242 |
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if (eof_sector > 0) {
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| 243 |
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bytes_read = sector_count * SECTOR_SIZE;
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| 244 |
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TRACEi(5, "partial read count:", bytes_read);
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| 245 |
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} else {
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bytes_read = result;
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}
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| 248 |
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} else {
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TRACEi(5, "zapping segment in cache :", buffer[tail].segment_id);
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}
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buffer[tail].status = waiting;
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next_buffer(&tail);
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}
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| 254 |
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if (!read_done && buffer[tail].status == reading) {
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| 255 |
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if (buffer[tail].segment_id == segment_id) {
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| 256 |
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int result = wait_segment(reading);
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| 257 |
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if (result < 0) {
|
| 258 |
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if (result == -EINTR) {
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| 259 |
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TRACE_EXIT;
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| 260 |
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return result;
|
| 261 |
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}
|
| 262 |
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TRACE(1, "wait_segment failed while reading");
|
| 263 |
|
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ftape_abort_operation();
|
| 264 |
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}
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| 265 |
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} else {
|
| 266 |
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/* We're reading the wrong segment, stop runner.
|
| 267 |
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*/
|
| 268 |
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ftape_abort_operation();
|
| 269 |
|
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}
|
| 270 |
|
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}
|
| 271 |
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/* if just passed the last segment on a track, wait for BOT or EOT mark.
|
| 272 |
|
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*/
|
| 273 |
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if (runner_status == logical_eot) {
|
| 274 |
|
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int status;
|
| 275 |
|
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result = ftape_ready_wait(timeout.seek, &status);
|
| 276 |
|
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if (result < 0) {
|
| 277 |
|
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TRACE(1, "ftape_ready_wait waiting for eot/bot failed");
|
| 278 |
|
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}
|
| 279 |
|
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if ((status & (QIC_STATUS_AT_BOT | QIC_STATUS_AT_EOT)) == 0) {
|
| 280 |
|
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TRACE(1, "eot/bot not reached");
|
| 281 |
|
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}
|
| 282 |
|
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runner_status = end_of_tape;
|
| 283 |
|
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}
|
| 284 |
|
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/* should runner stop ?
|
| 285 |
|
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*/
|
| 286 |
|
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if (runner_status == aborting || runner_status == buffer_overrun ||
|
| 287 |
|
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runner_status == end_of_tape) {
|
| 288 |
|
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if (runner_status != end_of_tape &&
|
| 289 |
|
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!(runner_status == aborting && !tape_running)) {
|
| 290 |
|
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ftape_dumb_stop();
|
| 291 |
|
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}
|
| 292 |
|
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if (runner_status == aborting) {
|
| 293 |
|
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if (buffer[head].status == reading || buffer[head].status == error) {
|
| 294 |
|
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if (buffer[head].status == error) {
|
| 295 |
|
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history.defects += count_ones(buffer[head].hard_error_map);
|
| 296 |
|
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}
|
| 297 |
|
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buffer[head].status = waiting;
|
| 298 |
|
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}
|
| 299 |
|
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}
|
| 300 |
|
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runner_status = idle; /* aborted ? */
|
| 301 |
|
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}
|
| 302 |
|
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/* If segment to read is empty, do not start runner for it,
|
| 303 |
|
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* but wait for next read call.
|
| 304 |
|
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*/
|
| 305 |
|
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if (get_bad_sector_entry(segment_id) == EMPTY_SEGMENT) {
|
| 306 |
|
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bytes_read = 0; /* flag empty segment */
|
| 307 |
|
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read_done = 1;
|
| 308 |
|
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}
|
| 309 |
|
|
/* Allow escape from this loop on signal !
|
| 310 |
|
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*/
|
| 311 |
|
|
if (current->signal & _DONT_BLOCK) {
|
| 312 |
|
|
TRACE(2, "interrupted by non-blockable signal");
|
| 313 |
|
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TRACE_EXIT;
|
| 314 |
|
|
return -EINTR;
|
| 315 |
|
|
}
|
| 316 |
|
|
/* If we got a segment: quit, or else retry up to limit.
|
| 317 |
|
|
*/
|
| 318 |
|
|
if (read_done) {
|
| 319 |
|
|
break;
|
| 320 |
|
|
}
|
| 321 |
|
|
if (retry > RETRIES_ON_ECC_ERROR) {
|
| 322 |
|
|
history.defects++;
|
| 323 |
|
|
TRACE(1, "too many retries on ecc failure");
|
| 324 |
|
|
TRACE_EXIT;
|
| 325 |
|
|
return -ENODATA;
|
| 326 |
|
|
}
|
| 327 |
|
|
/* Now at least one buffer is empty !
|
| 328 |
|
|
* Restart runner & tape if needed.
|
| 329 |
|
|
*/
|
| 330 |
|
|
TRACEx3(8, "head: %d, tail: %d, runner_status: %d",
|
| 331 |
|
|
head, tail, runner_status);
|
| 332 |
|
|
TRACEx2(8, "buffer[].status, [head]: %d, [tail]: %d",
|
| 333 |
|
|
buffer[head].status, buffer[tail].status);
|
| 334 |
|
|
if (buffer[tail].status == waiting) {
|
| 335 |
|
|
setup_new_segment(&buffer[head], segment_id, -1);
|
| 336 |
|
|
if (!read_ahead) {
|
| 337 |
|
|
buffer[head].next_segment = 0; /* disable read-ahead */
|
| 338 |
|
|
}
|
| 339 |
|
|
calc_next_cluster(&buffer[head]);
|
| 340 |
|
|
if (runner_status == idle) {
|
| 341 |
|
|
result = ftape_start_tape(segment_id,
|
| 342 |
|
|
buffer[head].sector_offset);
|
| 343 |
|
|
if (result < 0) {
|
| 344 |
|
|
TRACEx1(1, "Error: segment %d unreachable", segment_id);
|
| 345 |
|
|
TRACE_EXIT;
|
| 346 |
|
|
return result;
|
| 347 |
|
|
}
|
| 348 |
|
|
runner_status = running;
|
| 349 |
|
|
}
|
| 350 |
|
|
buffer[head].status = reading;
|
| 351 |
|
|
setup_fdc_and_dma(&buffer[head], FDC_READ);
|
| 352 |
|
|
}
|
| 353 |
|
|
}
|
| 354 |
|
|
if (read_done) {
|
| 355 |
|
|
TRACE_EXIT;
|
| 356 |
|
|
return bytes_read;
|
| 357 |
|
|
} else {
|
| 358 |
|
|
TRACE(1, "too many retries");
|
| 359 |
|
|
TRACE_EXIT;
|
| 360 |
|
|
return -EIO;
|
| 361 |
|
|
}
|
| 362 |
|
|
}
|
| 363 |
|
|
|
| 364 |
|
|
int read_header_segment(byte * address)
|
| 365 |
|
|
{
|
| 366 |
|
|
TRACE_FUN(5, "read_header_segment");
|
| 367 |
|
|
int i;
|
| 368 |
|
|
int result;
|
| 369 |
|
|
int header_segment = -1;
|
| 370 |
|
|
unsigned int max_floppy_side;
|
| 371 |
|
|
unsigned int max_floppy_track;
|
| 372 |
|
|
unsigned int max_floppy_sector;
|
| 373 |
|
|
int first_failed = 0;
|
| 374 |
|
|
int status;
|
| 375 |
|
|
int new_tape_len;
|
| 376 |
|
|
|
| 377 |
|
|
result = ftape_report_drive_status(&status);
|
| 378 |
|
|
if (result < 0) {
|
| 379 |
|
|
TRACE(1, "error: error_status or report failure");
|
| 380 |
|
|
TRACE_EXIT;
|
| 381 |
|
|
return -EIO;
|
| 382 |
|
|
}
|
| 383 |
|
|
TRACE(5, "reading...");
|
| 384 |
|
|
ftape_last_segment.id = 68; /* will allow us to read the header ! */
|
| 385 |
|
|
/* We're looking for the first header segment.
|
| 386 |
|
|
* A header segment cannot contain bad sectors, therefor at the
|
| 387 |
|
|
* tape start, segments with bad sectors are (according to QIC-40/80)
|
| 388 |
|
|
* written with deleted data marks and must be skipped.
|
| 389 |
|
|
*/
|
| 390 |
|
|
used_header_segment = -1;
|
| 391 |
|
|
result = 0;
|
| 392 |
|
|
for (header_segment = 0;
|
| 393 |
|
|
header_segment < ftape_last_segment.id && result == 0;
|
| 394 |
|
|
++header_segment) {
|
| 395 |
|
|
/* Set no read-ahead, the isr will force read-ahead whenever
|
| 396 |
|
|
* it encounters deleted data !
|
| 397 |
|
|
*/
|
| 398 |
|
|
result = read_segment(header_segment, address, &status, 0);
|
| 399 |
|
|
if (result < 0 && !first_failed) {
|
| 400 |
|
|
TRACE(1, "header segment damaged, trying backup");
|
| 401 |
|
|
first_failed = 1;
|
| 402 |
|
|
result = 0; /* force read of next (backup) segment */
|
| 403 |
|
|
}
|
| 404 |
|
|
}
|
| 405 |
|
|
if (result < 0 || header_segment >= ftape_last_segment.id) {
|
| 406 |
|
|
TRACE(1, "no readable header segment found");
|
| 407 |
|
|
TRACE_EXIT;
|
| 408 |
|
|
return -EIO;
|
| 409 |
|
|
}
|
| 410 |
|
|
result = ftape_abort_operation();
|
| 411 |
|
|
if (result < 0) {
|
| 412 |
|
|
TRACE(1, "ftape_abort_operation failed");
|
| 413 |
|
|
TRACE_EXIT;
|
| 414 |
|
|
return -EIO;
|
| 415 |
|
|
}
|
| 416 |
|
|
if (GET4(address, 0) != 0xaa55aa55) {
|
| 417 |
|
|
TRACE(1, "wrong signature in header segment");
|
| 418 |
|
|
TRACE_EXIT;
|
| 419 |
|
|
return -EIO;
|
| 420 |
|
|
}
|
| 421 |
|
|
header_segment_1 = GET2(address, 6);
|
| 422 |
|
|
header_segment_2 = GET2(address, 8);
|
| 423 |
|
|
TRACEx2(2, "header segments are %d and %d",
|
| 424 |
|
|
header_segment_1, header_segment_2);
|
| 425 |
|
|
used_header_segment = (first_failed) ? header_segment_2 : header_segment_1;
|
| 426 |
|
|
|
| 427 |
|
|
/* Verify tape parameters...
|
| 428 |
|
|
* QIC-40/80 spec: tape_parameters:
|
| 429 |
|
|
*
|
| 430 |
|
|
* segments-per-track segments_per_track
|
| 431 |
|
|
* tracks-per-cartridge tracks_per_tape
|
| 432 |
|
|
* max-floppy-side (segments_per_track *
|
| 433 |
|
|
* tracks_per_tape - 1) /
|
| 434 |
|
|
* segments_per_head
|
| 435 |
|
|
* max-floppy-track segments_per_head /
|
| 436 |
|
|
* segments_per_cylinder - 1
|
| 437 |
|
|
* max-floppy-sector segments_per_cylinder *
|
| 438 |
|
|
* SECTORS_PER_SEGMENT
|
| 439 |
|
|
*/
|
| 440 |
|
|
format_code = (format_type) * (address + 4);
|
| 441 |
|
|
segments_per_track = GET2(address, 24);
|
| 442 |
|
|
tracks_per_tape = *(address + 26);
|
| 443 |
|
|
max_floppy_side = *(address + 27);
|
| 444 |
|
|
max_floppy_track = *(address + 28);
|
| 445 |
|
|
max_floppy_sector = *(address + 29);
|
| 446 |
|
|
TRACEx6(4, "(fmt/spt/tpc/fhm/ftm/fsm) = %d/%d/%d/%d/%d/%d",
|
| 447 |
|
|
format_code, segments_per_track, tracks_per_tape,
|
| 448 |
|
|
max_floppy_side, max_floppy_track, max_floppy_sector);
|
| 449 |
|
|
new_tape_len = tape_len;
|
| 450 |
|
|
switch (format_code) {
|
| 451 |
|
|
case fmt_425ft:
|
| 452 |
|
|
new_tape_len = 425;
|
| 453 |
|
|
break;
|
| 454 |
|
|
case fmt_normal:
|
| 455 |
|
|
if (tape_len == 0) { /* otherwise 307 ft */
|
| 456 |
|
|
new_tape_len = 205;
|
| 457 |
|
|
}
|
| 458 |
|
|
break;
|
| 459 |
|
|
case fmt_1100ft:
|
| 460 |
|
|
new_tape_len = 1100;
|
| 461 |
|
|
break;
|
| 462 |
|
|
case fmt_wide:{
|
| 463 |
|
|
int segments_per_1000_inch = 1; /* non-zero default for switch */
|
| 464 |
|
|
switch (qic_std) {
|
| 465 |
|
|
case QIC_TAPE_QIC40:
|
| 466 |
|
|
segments_per_1000_inch = 332;
|
| 467 |
|
|
break;
|
| 468 |
|
|
case QIC_TAPE_QIC80:
|
| 469 |
|
|
segments_per_1000_inch = 488;
|
| 470 |
|
|
break;
|
| 471 |
|
|
case QIC_TAPE_QIC3010:
|
| 472 |
|
|
segments_per_1000_inch = 730;
|
| 473 |
|
|
break;
|
| 474 |
|
|
case QIC_TAPE_QIC3020:
|
| 475 |
|
|
segments_per_1000_inch = 1430;
|
| 476 |
|
|
break;
|
| 477 |
|
|
}
|
| 478 |
|
|
new_tape_len = (1000 * segments_per_track +
|
| 479 |
|
|
(segments_per_1000_inch - 1)) / segments_per_1000_inch;
|
| 480 |
|
|
break;
|
| 481 |
|
|
}
|
| 482 |
|
|
default:
|
| 483 |
|
|
TRACE(1, "unknown tape format, please report !");
|
| 484 |
|
|
TRACE_EXIT;
|
| 485 |
|
|
return -EIO;
|
| 486 |
|
|
}
|
| 487 |
|
|
if (new_tape_len != tape_len) {
|
| 488 |
|
|
tape_len = new_tape_len;
|
| 489 |
|
|
TRACEx1(1, "calculated tape length is %d ft", tape_len);
|
| 490 |
|
|
ftape_calc_timeouts();
|
| 491 |
|
|
}
|
| 492 |
|
|
if (segments_per_track == 0 && tracks_per_tape == 0 &&
|
| 493 |
|
|
max_floppy_side == 0 && max_floppy_track == 0 &&
|
| 494 |
|
|
max_floppy_sector == 0) {
|
| 495 |
|
|
/* QIC-40 Rev E and earlier has no values in the header.
|
| 496 |
|
|
*/
|
| 497 |
|
|
segments_per_track = 68;
|
| 498 |
|
|
tracks_per_tape = 20;
|
| 499 |
|
|
max_floppy_side = 1;
|
| 500 |
|
|
max_floppy_track = 169;
|
| 501 |
|
|
max_floppy_sector = 128;
|
| 502 |
|
|
}
|
| 503 |
|
|
/* This test will compensate for the wrong parameter on tapes
|
| 504 |
|
|
* formatted by Conner software.
|
| 505 |
|
|
*/
|
| 506 |
|
|
if (segments_per_track == 150 &&
|
| 507 |
|
|
tracks_per_tape == 28 &&
|
| 508 |
|
|
max_floppy_side == 7 &&
|
| 509 |
|
|
max_floppy_track == 149 &&
|
| 510 |
|
|
max_floppy_sector == 128) {
|
| 511 |
|
|
TRACE(-1, "the famous CONNER bug: max_floppy_side off by one !");
|
| 512 |
|
|
max_floppy_side = 6;
|
| 513 |
|
|
}
|
| 514 |
|
|
/* This test will compensate for the wrong parameter on tapes
|
| 515 |
|
|
* formatted by Colorado Windows software.
|
| 516 |
|
|
*/
|
| 517 |
|
|
if (segments_per_track == 150 &&
|
| 518 |
|
|
tracks_per_tape == 28 &&
|
| 519 |
|
|
max_floppy_side == 6 &&
|
| 520 |
|
|
max_floppy_track == 150 &&
|
| 521 |
|
|
max_floppy_sector == 128) {
|
| 522 |
|
|
TRACE(-1, "the famous Colorado bug: max_floppy_track off by one !");
|
| 523 |
|
|
max_floppy_track = 149;
|
| 524 |
|
|
}
|
| 525 |
|
|
segments_per_head = ((max_floppy_sector / SECTORS_PER_SEGMENT) *
|
| 526 |
|
|
(max_floppy_track + 1));
|
| 527 |
|
|
/*
|
| 528 |
|
|
* Verify drive_configuration with tape parameters
|
| 529 |
|
|
*/
|
| 530 |
|
|
if (segments_per_head == 0 || segments_per_cylinder == 0 ||
|
| 531 |
|
|
((segments_per_track * tracks_per_tape - 1) / segments_per_head
|
| 532 |
|
|
!= max_floppy_side) ||
|
| 533 |
|
|
(segments_per_head / segments_per_cylinder - 1 != max_floppy_track) ||
|
| 534 |
|
|
(segments_per_cylinder * SECTORS_PER_SEGMENT != max_floppy_sector)
|
| 535 |
|
|
#ifdef TESTING
|
| 536 |
|
|
|| (format_code == 4 && (max_floppy_track != 254 || max_floppy_sector != 128))
|
| 537 |
|
|
#endif
|
| 538 |
|
|
) {
|
| 539 |
|
|
TRACE(1, "Tape parameters inconsistency, please report");
|
| 540 |
|
|
TRACE_EXIT;
|
| 541 |
|
|
return -EIO;
|
| 542 |
|
|
}
|
| 543 |
|
|
first_data_segment = GET2(address, 10); /* first data segment */
|
| 544 |
|
|
TRACEi(4, "first data segment:", first_data_segment);
|
| 545 |
|
|
extract_bad_sector_map(address);
|
| 546 |
|
|
/* Find the highest segment id that allows still one full
|
| 547 |
|
|
* deblock_buffer to be written to tape.
|
| 548 |
|
|
*/
|
| 549 |
|
|
ftape_last_segment.size = 0;
|
| 550 |
|
|
for (i = segments_per_track * tracks_per_tape - 1; i >= 0; --i) {
|
| 551 |
|
|
int space = SECTORS_PER_SEGMENT - 3 - count_ones(get_bad_sector_entry(i));
|
| 552 |
|
|
if (space > 0) {
|
| 553 |
|
|
ftape_last_segment.size += space; /* sectors free */
|
| 554 |
|
|
ftape_last_segment.free = (ftape_last_segment.size -
|
| 555 |
|
|
sizeof(deblock_buffer) / SECTOR_SIZE);
|
| 556 |
|
|
if (ftape_last_segment.free >= 0) {
|
| 557 |
|
|
ftape_last_segment.id = i;
|
| 558 |
|
|
TRACEx2(4, "`last' segment is %d, %d Kb",
|
| 559 |
|
|
ftape_last_segment.id, ftape_last_segment.size);
|
| 560 |
|
|
break;
|
| 561 |
|
|
}
|
| 562 |
|
|
}
|
| 563 |
|
|
}
|
| 564 |
|
|
/* Copy the failed sector log into our local buffer.
|
| 565 |
|
|
*/
|
| 566 |
|
|
if (!ftape_validate_label(&deblock_buffer[30])) {
|
| 567 |
|
|
TRACE(-1, "This tape has no `Linux raw format' label,\n"
|
| 568 |
|
|
"***** Use `mt' to erase this tape if you want to use file marks !");
|
| 569 |
|
|
} else {
|
| 570 |
|
|
extract_file_marks(address);
|
| 571 |
|
|
}
|
| 572 |
|
|
ftape_reset_position();
|
| 573 |
|
|
TRACE_EXIT;
|
| 574 |
|
|
return 0;
|
| 575 |
|
|
}
|
| 576 |
|
|
|
| 577 |
|
|
int _ftape_read(char *buff, int req_len)
|
| 578 |
|
|
{
|
| 579 |
|
|
TRACE_FUN(5, "_ftape_read");
|
| 580 |
|
|
int result = 0;
|
| 581 |
|
|
int cnt;
|
| 582 |
|
|
int to_do = req_len;
|
| 583 |
|
|
static int remaining;
|
| 584 |
|
|
int bytes_read = 0;
|
| 585 |
|
|
|
| 586 |
|
|
if (ftape_offline || !formatted || no_tape) {
|
| 587 |
|
|
TRACEx3(-1, "offline = %d, formatted = %d, no_tape = %d",
|
| 588 |
|
|
ftape_offline, formatted, no_tape);
|
| 589 |
|
|
result = -EIO;
|
| 590 |
|
|
} else {
|
| 591 |
|
|
history.used |= 1;
|
| 592 |
|
|
if (first_data_segment == -1) {
|
| 593 |
|
|
result = read_header_segment(deblock_buffer);
|
| 594 |
|
|
}
|
| 595 |
|
|
}
|
| 596 |
|
|
if (result < 0) {
|
| 597 |
|
|
TRACE_EXIT;
|
| 598 |
|
|
return result;
|
| 599 |
|
|
}
|
| 600 |
|
|
/* As GNU tar doesn't accept partial read counts when the multiple
|
| 601 |
|
|
* volume flag is set, we make sure to return the requested amount
|
| 602 |
|
|
* of data. Except, of course, at the end of the tape or file mark.
|
| 603 |
|
|
*/
|
| 604 |
|
|
while (to_do > 0) { /* don't return with a partial count ! */
|
| 605 |
|
|
/* If we're reading the `last' segment(s) on tape, make sure we don't
|
| 606 |
|
|
* get more than 29 Kb from it (As it only contains this much).
|
| 607 |
|
|
* This works only for sequential access, so random access should
|
| 608 |
|
|
* stay away from this `last' segment.
|
| 609 |
|
|
* Note: ftape_seg_pos points to the next segment that will be
|
| 610 |
|
|
* read, so it's one too high here!
|
| 611 |
|
|
*/
|
| 612 |
|
|
if (!eof_mark && ftape_seg_pos - 1 >= ftape_last_segment.id) {
|
| 613 |
|
|
TRACEi(5, "remaining of last segment:", remaining);
|
| 614 |
|
|
if (to_do > remaining) {
|
| 615 |
|
|
to_do = remaining; /* fake a smaller request */
|
| 616 |
|
|
TRACE(5, "clipped request to remaining");
|
| 617 |
|
|
}
|
| 618 |
|
|
}
|
| 619 |
|
|
while (!eof_mark && buf_len_rd == 0) {
|
| 620 |
|
|
/* When starting to read the `last' segment, set remaining
|
| 621 |
|
|
*/
|
| 622 |
|
|
if (ftape_seg_pos == ftape_last_segment.id) {
|
| 623 |
|
|
remaining = sizeof(deblock_buffer);
|
| 624 |
|
|
TRACEi(5, "remaining set to:", remaining);
|
| 625 |
|
|
}
|
| 626 |
|
|
result = read_segment(ftape_seg_pos, deblock_buffer, &eof_mark, 1);
|
| 627 |
|
|
if (result < 0) {
|
| 628 |
|
|
if (result == -ENODATA) {
|
| 629 |
|
|
/* Unable to recover tape data, return error and skip bad spot.
|
| 630 |
|
|
*/
|
| 631 |
|
|
++ftape_seg_pos;
|
| 632 |
|
|
}
|
| 633 |
|
|
TRACEx1(4, "read_segment result: %d", result);
|
| 634 |
|
|
TRACE_EXIT;
|
| 635 |
|
|
return result;
|
| 636 |
|
|
}
|
| 637 |
|
|
/* Allow escape from this loop on signal !
|
| 638 |
|
|
*/
|
| 639 |
|
|
if (current->signal & _DONT_BLOCK) {
|
| 640 |
|
|
TRACE(2, "interrupted by non-blockable signal");
|
| 641 |
|
|
TRACE_EXIT;
|
| 642 |
|
|
return -EINTR;
|
| 643 |
|
|
}
|
| 644 |
|
|
buf_pos_rd = 0;
|
| 645 |
|
|
buf_len_rd = result;
|
| 646 |
|
|
++ftape_seg_pos;
|
| 647 |
|
|
}
|
| 648 |
|
|
/* Take as much as we can use
|
| 649 |
|
|
*/
|
| 650 |
|
|
cnt = (buf_len_rd < to_do) ? buf_len_rd : to_do;
|
| 651 |
|
|
TRACEi(7, "nr bytes just read:", cnt);
|
| 652 |
|
|
if (cnt > 0) {
|
| 653 |
|
|
result = verify_area(VERIFY_WRITE, buff, cnt);
|
| 654 |
|
|
if (result) {
|
| 655 |
|
|
TRACEx1(1, "verify_area failed, exitcode = %d", result);
|
| 656 |
|
|
TRACE_EXIT;
|
| 657 |
|
|
return -EIO;
|
| 658 |
|
|
}
|
| 659 |
|
|
memcpy_tofs(buff, deblock_buffer + buf_pos_rd, cnt);
|
| 660 |
|
|
buff += cnt;
|
| 661 |
|
|
to_do -= cnt; /* what's left from req_len */
|
| 662 |
|
|
remaining -= cnt; /* what remains on this tape */
|
| 663 |
|
|
bytes_read += cnt; /* what we got so far */
|
| 664 |
|
|
buf_pos_rd += cnt; /* index in buffer */
|
| 665 |
|
|
buf_len_rd -= cnt; /* remaining bytes in buffer */
|
| 666 |
|
|
}
|
| 667 |
|
|
if (eof_mark && buf_len_rd == 0) { /* nothing left */
|
| 668 |
|
|
TRACE(5, "partial count because of eof mark");
|
| 669 |
|
|
if (bytes_read == 0) {
|
| 670 |
|
|
eof_mark = 0; /* no need for mark next read */
|
| 671 |
|
|
}
|
| 672 |
|
|
break;
|
| 673 |
|
|
}
|
| 674 |
|
|
}
|
| 675 |
|
|
TRACE_EXIT;
|
| 676 |
|
|
return bytes_read;
|
| 677 |
|
|
}
|
