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-rw-r--r--drivers/char/ftape/lowlevel/ftape-write.c336
1 files changed, 0 insertions, 336 deletions
diff --git a/drivers/char/ftape/lowlevel/ftape-write.c b/drivers/char/ftape/lowlevel/ftape-write.c
deleted file mode 100644
index 45601ec..0000000
--- a/drivers/char/ftape/lowlevel/ftape-write.c
+++ /dev/null
@@ -1,336 +0,0 @@
-/*
- * Copyright (C) 1993-1995 Bas Laarhoven,
- * (C) 1996-1997 Claus-Justus Heine.
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2, or (at your option)
- any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; see the file COPYING. If not, write to
- the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
-
- *
- * $Source: /homes/cvs/ftape-stacked/ftape/lowlevel/ftape-write.c,v $
- * $Revision: 1.3.4.1 $
- * $Date: 1997/11/14 18:07:04 $
- *
- * This file contains the writing code
- * for the QIC-117 floppy-tape driver for Linux.
- */
-
-#include <linux/string.h>
-#include <linux/errno.h>
-#include <linux/mm.h>
-
-#include <linux/ftape.h>
-#include <linux/qic117.h>
-#include "../lowlevel/ftape-tracing.h"
-#include "../lowlevel/ftape-write.h"
-#include "../lowlevel/ftape-read.h"
-#include "../lowlevel/ftape-io.h"
-#include "../lowlevel/ftape-ctl.h"
-#include "../lowlevel/ftape-rw.h"
-#include "../lowlevel/ftape-ecc.h"
-#include "../lowlevel/ftape-bsm.h"
-#include "../lowlevel/fdc-isr.h"
-
-/* Global vars.
- */
-
-/* Local vars.
- */
-static int last_write_failed;
-
-void ftape_zap_write_buffers(void)
-{
- int i;
-
- for (i = 0; i < ft_nr_buffers; ++i) {
- ft_buffer[i]->status = done;
- }
- ftape_reset_buffer();
-}
-
-static int copy_and_gen_ecc(void *destination,
- const void *source,
- const SectorMap bad_sector_map)
-{
- int result;
- struct memory_segment mseg;
- int bads = count_ones(bad_sector_map);
- TRACE_FUN(ft_t_any);
-
- if (bads > 0) {
- TRACE(ft_t_noise, "bad sectors in map: %d", bads);
- }
- if (bads + 3 >= FT_SECTORS_PER_SEGMENT) {
- TRACE(ft_t_noise, "empty segment");
- mseg.blocks = 0; /* skip entire segment */
- result = 0; /* nothing written */
- } else {
- mseg.blocks = FT_SECTORS_PER_SEGMENT - bads;
- mseg.data = destination;
- memcpy(mseg.data, source, (mseg.blocks - 3) * FT_SECTOR_SIZE);
- result = ftape_ecc_set_segment_parity(&mseg);
- if (result < 0) {
- TRACE(ft_t_err, "ecc_set_segment_parity failed");
- } else {
- result = (mseg.blocks - 3) * FT_SECTOR_SIZE;
- }
- }
- TRACE_EXIT result;
-}
-
-
-int ftape_start_writing(const ft_write_mode_t mode)
-{
- buffer_struct *head = ftape_get_buffer(ft_queue_head);
- int segment_id = head->segment_id;
- int result;
- buffer_state_enum wanted_state = (mode == FT_WR_DELETE
- ? deleting
- : writing);
- TRACE_FUN(ft_t_flow);
-
- if ((ft_driver_state != wanted_state) || head->status != waiting) {
- TRACE_EXIT 0;
- }
- ftape_setup_new_segment(head, segment_id, 1);
- if (mode == FT_WR_SINGLE) {
- /* stop tape instead of pause */
- head->next_segment = 0;
- }
- ftape_calc_next_cluster(head); /* prepare */
- head->status = ft_driver_state; /* either writing or deleting */
- if (ft_runner_status == idle) {
- TRACE(ft_t_noise,
- "starting runner for segment %d", segment_id);
- TRACE_CATCH(ftape_start_tape(segment_id,head->sector_offset),);
- } else {
- TRACE(ft_t_noise, "runner not idle, not starting tape");
- }
- /* go */
- result = fdc_setup_read_write(head, (mode == FT_WR_DELETE
- ? FDC_WRITE_DELETED : FDC_WRITE));
- ftape_set_state(wanted_state); /* should not be necessary */
- TRACE_EXIT result;
-}
-
-/* Wait until all data is actually written to tape.
- *
- * There is a problem: when the tape runs into logical EOT, then this
- * failes. We need to restart the runner in this case.
- */
-int ftape_loop_until_writes_done(void)
-{
- buffer_struct *head;
- TRACE_FUN(ft_t_flow);
-
- while ((ft_driver_state == writing || ft_driver_state == deleting) &&
- ftape_get_buffer(ft_queue_head)->status != done) {
- /* set the runner status to idle if at lEOT */
- TRACE_CATCH(ftape_handle_logical_eot(), last_write_failed = 1);
- /* restart the tape if necessary */
- if (ft_runner_status == idle) {
- TRACE(ft_t_noise, "runner is idle, restarting");
- if (ft_driver_state == deleting) {
- TRACE_CATCH(ftape_start_writing(FT_WR_DELETE),
- last_write_failed = 1);
- } else {
- TRACE_CATCH(ftape_start_writing(FT_WR_MULTI),
- last_write_failed = 1);
- }
- }
- TRACE(ft_t_noise, "tail: %d, head: %d",
- ftape_buffer_id(ft_queue_tail),
- ftape_buffer_id(ft_queue_head));
- TRACE_CATCH(fdc_interrupt_wait(5 * FT_SECOND),
- last_write_failed = 1);
- head = ftape_get_buffer(ft_queue_head);
- if (head->status == error) {
- /* Allow escape from loop when signaled !
- */
- FT_SIGNAL_EXIT(_DONT_BLOCK);
- if (head->hard_error_map != 0) {
- /* Implement hard write error recovery here
- */
- }
- /* retry this one */
- head->status = waiting;
- if (ft_runner_status == aborting) {
- ftape_dumb_stop();
- }
- if (ft_runner_status != idle) {
- TRACE_ABORT(-EIO, ft_t_err,
- "unexpected state: "
- "ft_runner_status != idle");
- }
- ftape_start_writing(ft_driver_state == deleting
- ? FT_WR_MULTI : FT_WR_DELETE);
- }
- TRACE(ft_t_noise, "looping until writes done");
- }
- ftape_set_state(idle);
- TRACE_EXIT 0;
-}
-
-/* Write given segment from buffer at address to tape.
- */
-static int write_segment(const int segment_id,
- const void *address,
- const ft_write_mode_t write_mode)
-{
- int bytes_written = 0;
- buffer_struct *tail;
- buffer_state_enum wanted_state = (write_mode == FT_WR_DELETE
- ? deleting : writing);
- TRACE_FUN(ft_t_flow);
-
- TRACE(ft_t_noise, "segment_id = %d", segment_id);
- if (ft_driver_state != wanted_state) {
- if (ft_driver_state == deleting ||
- wanted_state == deleting) {
- TRACE_CATCH(ftape_loop_until_writes_done(),);
- }
- TRACE(ft_t_noise, "calling ftape_abort_operation");
- TRACE_CATCH(ftape_abort_operation(),);
- ftape_zap_write_buffers();
- ftape_set_state(wanted_state);
- }
- /* if all buffers full we'll have to wait...
- */
- ftape_wait_segment(wanted_state);
- tail = ftape_get_buffer(ft_queue_tail);
- switch(tail->status) {
- case done:
- ft_history.defects += count_ones(tail->hard_error_map);
- break;
- case waiting:
- /* this could happen with multiple EMPTY_SEGMENTs, but
- * shouldn't happen any more as we re-start the runner even
- * with an empty segment.
- */
- bytes_written = -EAGAIN;
- break;
- case error:
- /* setup for a retry
- */
- tail->status = waiting;
- bytes_written = -EAGAIN; /* force retry */
- if (tail->hard_error_map != 0) {
- TRACE(ft_t_warn,
- "warning: %d hard error(s) in written segment",
- count_ones(tail->hard_error_map));
- TRACE(ft_t_noise, "hard_error_map = 0x%08lx",
- (long)tail->hard_error_map);
- /* Implement hard write error recovery here
- */
- }
- break;
- default:
- TRACE_ABORT(-EIO, ft_t_err,
- "wait for empty segment failed, tail status: %d",
- tail->status);
- }
- /* should runner stop ?
- */
- if (ft_runner_status == aborting) {
- buffer_struct *head = ftape_get_buffer(ft_queue_head);
- if (head->status == wanted_state) {
- head->status = done; /* ???? */
- }
- /* don't call abort_operation(), we don't want to zap
- * the dma buffers
- */
- TRACE_CATCH(ftape_dumb_stop(),);
- } else {
- /* If just passed last segment on tape: wait for BOT
- * or EOT mark. Sets ft_runner_status to idle if at lEOT
- * and successful
- */
- TRACE_CATCH(ftape_handle_logical_eot(),);
- }
- if (tail->status == done) {
- /* now at least one buffer is empty, fill it with our
- * data. skip bad sectors and generate ecc.
- * copy_and_gen_ecc return nr of bytes written, range
- * 0..29 Kb inclusive!
- *
- * Empty segments are handled inside coyp_and_gen_ecc()
- */
- if (write_mode != FT_WR_DELETE) {
- TRACE_CATCH(bytes_written = copy_and_gen_ecc(
- tail->address, address,
- ftape_get_bad_sector_entry(segment_id)),);
- }
- tail->segment_id = segment_id;
- tail->status = waiting;
- tail = ftape_next_buffer(ft_queue_tail);
- }
- /* Start tape only if all buffers full or flush mode.
- * This will give higher probability of streaming.
- */
- if (ft_runner_status != running &&
- ((tail->status == waiting &&
- ftape_get_buffer(ft_queue_head) == tail) ||
- write_mode != FT_WR_ASYNC)) {
- TRACE_CATCH(ftape_start_writing(write_mode),);
- }
- TRACE_EXIT bytes_written;
-}
-
-/* Write as much as fits from buffer to the given segment on tape
- * and handle retries.
- * Return the number of bytes written (>= 0), or:
- * -EIO write failed
- * -EINTR interrupted by signal
- * -ENOSPC device full
- */
-int ftape_write_segment(const int segment_id,
- const void *buffer,
- const ft_write_mode_t flush)
-{
- int retry = 0;
- int result;
- TRACE_FUN(ft_t_flow);
-
- ft_history.used |= 2;
- if (segment_id >= ft_tracks_per_tape*ft_segments_per_track) {
- /* tape full */
- TRACE_ABORT(-ENOSPC, ft_t_err,
- "invalid segment id: %d (max %d)",
- segment_id,
- ft_tracks_per_tape * ft_segments_per_track -1);
- }
- for (;;) {
- if ((result = write_segment(segment_id, buffer, flush)) >= 0) {
- if (result == 0) { /* empty segment */
- TRACE(ft_t_noise,
- "empty segment, nothing written");
- }
- TRACE_EXIT result;
- }
- if (result == -EAGAIN) {
- if (++retry > 100) { /* give up */
- TRACE_ABORT(-EIO, ft_t_err,
- "write failed, >100 retries in segment");
- }
- TRACE(ft_t_warn, "write error, retry %d (%d)",
- retry,
- ftape_get_buffer(ft_queue_tail)->segment_id);
- } else {
- TRACE_ABORT(result, ft_t_err,
- "write_segment failed, error: %d", result);
- }
- /* Allow escape from loop when signaled !
- */
- FT_SIGNAL_EXIT(_DONT_BLOCK);
- }
-}
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