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336 lines
9.6 KiB
336 lines
9.6 KiB
/*
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* Copyright (C) 1993-1995 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-write.c,v $
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* $Revision: 1.3.4.1 $
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* $Date: 1997/11/14 18:07:04 $
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*
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* This file contains the writing 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 <linux/qic117.h>
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#include "../lowlevel/ftape-tracing.h"
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#include "../lowlevel/ftape-write.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-ecc.h"
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#include "../lowlevel/ftape-bsm.h"
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#include "../lowlevel/fdc-isr.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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static int last_write_failed;
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void ftape_zap_write_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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ft_buffer[i]->status = done;
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}
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ftape_reset_buffer();
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}
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static int copy_and_gen_ecc(void *destination,
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const void *source,
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const SectorMap bad_sector_map)
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{
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int result;
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struct memory_segment mseg;
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int bads = count_ones(bad_sector_map);
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TRACE_FUN(ft_t_any);
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if (bads > 0) {
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TRACE(ft_t_noise, "bad sectors in map: %d", bads);
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}
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if (bads + 3 >= FT_SECTORS_PER_SEGMENT) {
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TRACE(ft_t_noise, "empty segment");
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mseg.blocks = 0; /* skip entire segment */
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result = 0; /* nothing written */
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} else {
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mseg.blocks = FT_SECTORS_PER_SEGMENT - bads;
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mseg.data = destination;
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memcpy(mseg.data, source, (mseg.blocks - 3) * FT_SECTOR_SIZE);
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result = ftape_ecc_set_segment_parity(&mseg);
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if (result < 0) {
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TRACE(ft_t_err, "ecc_set_segment_parity failed");
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} else {
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result = (mseg.blocks - 3) * FT_SECTOR_SIZE;
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}
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}
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TRACE_EXIT result;
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}
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int ftape_start_writing(const ft_write_mode_t mode)
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{
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buffer_struct *head = ftape_get_buffer(ft_queue_head);
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int segment_id = head->segment_id;
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int result;
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buffer_state_enum wanted_state = (mode == FT_WR_DELETE
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? deleting
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: writing);
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TRACE_FUN(ft_t_flow);
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if ((ft_driver_state != wanted_state) || head->status != waiting) {
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TRACE_EXIT 0;
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}
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ftape_setup_new_segment(head, segment_id, 1);
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if (mode == FT_WR_SINGLE) {
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/* stop tape instead of pause */
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head->next_segment = 0;
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}
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ftape_calc_next_cluster(head); /* prepare */
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head->status = ft_driver_state; /* either writing or deleting */
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if (ft_runner_status == idle) {
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TRACE(ft_t_noise,
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"starting runner for segment %d", segment_id);
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TRACE_CATCH(ftape_start_tape(segment_id,head->sector_offset),);
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} else {
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TRACE(ft_t_noise, "runner not idle, not starting tape");
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}
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/* go */
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result = fdc_setup_read_write(head, (mode == FT_WR_DELETE
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? FDC_WRITE_DELETED : FDC_WRITE));
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ftape_set_state(wanted_state); /* should not be necessary */
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TRACE_EXIT result;
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}
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/* Wait until all data is actually written to tape.
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*
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* There is a problem: when the tape runs into logical EOT, then this
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* failes. We need to restart the runner in this case.
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*/
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int ftape_loop_until_writes_done(void)
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{
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buffer_struct *head;
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TRACE_FUN(ft_t_flow);
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while ((ft_driver_state == writing || ft_driver_state == deleting) &&
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ftape_get_buffer(ft_queue_head)->status != done) {
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/* set the runner status to idle if at lEOT */
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TRACE_CATCH(ftape_handle_logical_eot(), last_write_failed = 1);
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/* restart the tape if necessary */
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if (ft_runner_status == idle) {
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TRACE(ft_t_noise, "runner is idle, restarting");
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if (ft_driver_state == deleting) {
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TRACE_CATCH(ftape_start_writing(FT_WR_DELETE),
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last_write_failed = 1);
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} else {
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TRACE_CATCH(ftape_start_writing(FT_WR_MULTI),
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last_write_failed = 1);
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}
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}
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TRACE(ft_t_noise, "tail: %d, head: %d",
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ftape_buffer_id(ft_queue_tail),
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ftape_buffer_id(ft_queue_head));
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TRACE_CATCH(fdc_interrupt_wait(5 * FT_SECOND),
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last_write_failed = 1);
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head = ftape_get_buffer(ft_queue_head);
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if (head->status == error) {
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/* Allow escape from loop when signaled !
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*/
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FT_SIGNAL_EXIT(_DONT_BLOCK);
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if (head->hard_error_map != 0) {
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/* Implement hard write error recovery here
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*/
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}
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/* retry this one */
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head->status = waiting;
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if (ft_runner_status == aborting) {
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ftape_dumb_stop();
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}
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if (ft_runner_status != idle) {
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TRACE_ABORT(-EIO, ft_t_err,
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"unexpected state: "
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"ft_runner_status != idle");
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}
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ftape_start_writing(ft_driver_state == deleting
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? FT_WR_MULTI : FT_WR_DELETE);
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}
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TRACE(ft_t_noise, "looping until writes done");
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}
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ftape_set_state(idle);
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TRACE_EXIT 0;
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}
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/* Write given segment from buffer at address to tape.
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*/
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static int write_segment(const int segment_id,
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const void *address,
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const ft_write_mode_t write_mode)
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{
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int bytes_written = 0;
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buffer_struct *tail;
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buffer_state_enum wanted_state = (write_mode == FT_WR_DELETE
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? deleting : writing);
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TRACE_FUN(ft_t_flow);
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TRACE(ft_t_noise, "segment_id = %d", segment_id);
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if (ft_driver_state != wanted_state) {
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if (ft_driver_state == deleting ||
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wanted_state == deleting) {
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TRACE_CATCH(ftape_loop_until_writes_done(),);
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}
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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_zap_write_buffers();
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ftape_set_state(wanted_state);
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}
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/* if all buffers full we'll have to wait...
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*/
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ftape_wait_segment(wanted_state);
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tail = ftape_get_buffer(ft_queue_tail);
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switch(tail->status) {
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case done:
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ft_history.defects += count_ones(tail->hard_error_map);
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break;
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case waiting:
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/* this could happen with multiple EMPTY_SEGMENTs, but
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* shouldn't happen any more as we re-start the runner even
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* with an empty segment.
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*/
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bytes_written = -EAGAIN;
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break;
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case error:
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/* setup for a retry
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*/
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tail->status = waiting;
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bytes_written = -EAGAIN; /* force retry */
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if (tail->hard_error_map != 0) {
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TRACE(ft_t_warn,
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"warning: %d hard error(s) in written segment",
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count_ones(tail->hard_error_map));
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TRACE(ft_t_noise, "hard_error_map = 0x%08lx",
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(long)tail->hard_error_map);
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/* Implement hard write error recovery here
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*/
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}
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break;
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default:
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TRACE_ABORT(-EIO, ft_t_err,
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"wait for empty segment failed, tail status: %d",
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tail->status);
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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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if (head->status == wanted_state) {
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head->status = done; /* ???? */
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}
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/* don't call abort_operation(), we don't want to zap
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* the dma buffers
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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 for BOT
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* or EOT mark. Sets ft_runner_status to idle if at lEOT
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* 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 (tail->status == done) {
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/* now at least one buffer is empty, fill it with our
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* data. skip bad sectors and generate ecc.
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* copy_and_gen_ecc return nr of bytes written, range
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* 0..29 Kb inclusive!
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*
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* Empty segments are handled inside coyp_and_gen_ecc()
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*/
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if (write_mode != FT_WR_DELETE) {
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TRACE_CATCH(bytes_written = copy_and_gen_ecc(
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tail->address, address,
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ftape_get_bad_sector_entry(segment_id)),);
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}
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tail->segment_id = segment_id;
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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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/* Start tape only if all buffers full or flush mode.
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* This will give higher probability of streaming.
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*/
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if (ft_runner_status != running &&
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((tail->status == waiting &&
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ftape_get_buffer(ft_queue_head) == tail) ||
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write_mode != FT_WR_ASYNC)) {
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TRACE_CATCH(ftape_start_writing(write_mode),);
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}
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TRACE_EXIT bytes_written;
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}
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/* Write as much as fits from buffer to the given segment on tape
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* and handle retries.
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* Return the number of bytes written (>= 0), or:
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* -EIO write failed
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* -EINTR interrupted by signal
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* -ENOSPC device full
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*/
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int ftape_write_segment(const int segment_id,
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const void *buffer,
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const ft_write_mode_t flush)
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{
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int retry = 0;
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int result;
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TRACE_FUN(ft_t_flow);
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ft_history.used |= 2;
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if (segment_id >= ft_tracks_per_tape*ft_segments_per_track) {
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/* tape full */
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TRACE_ABORT(-ENOSPC, ft_t_err,
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"invalid segment id: %d (max %d)",
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segment_id,
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ft_tracks_per_tape * ft_segments_per_track -1);
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}
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for (;;) {
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if ((result = write_segment(segment_id, buffer, flush)) >= 0) {
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if (result == 0) { /* empty segment */
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TRACE(ft_t_noise,
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"empty segment, nothing written");
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}
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TRACE_EXIT result;
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}
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if (result == -EAGAIN) {
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if (++retry > 100) { /* give up */
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TRACE_ABORT(-EIO, ft_t_err,
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"write failed, >100 retries in segment");
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}
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TRACE(ft_t_warn, "write error, retry %d (%d)",
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retry,
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ftape_get_buffer(ft_queue_tail)->segment_id);
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} else {
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TRACE_ABORT(result, ft_t_err,
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"write_segment failed, error: %d", result);
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}
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/* Allow escape from loop when signaled !
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*/
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FT_SIGNAL_EXIT(_DONT_BLOCK);
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}
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}
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