1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
345 lines
9.8 KiB
C
345 lines
9.8 KiB
C
/*
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* Copyright (C) 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-format.c,v $
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* $Revision: 1.2.4.1 $
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* $Date: 1997/11/14 16:05:39 $
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*
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* This file contains the code to support formatting of floppy
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* tape cartridges with the QIC-40/80/3010/3020 floppy-tape
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* driver "ftape" 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/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-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/ftape-format.h"
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#if defined(TESTING)
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#define FT_FMT_SEGS_PER_BUF 50
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#else
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#define FT_FMT_SEGS_PER_BUF (FT_BUFF_SIZE/(4*FT_SECTORS_PER_SEGMENT))
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#endif
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static spinlock_t ftape_format_lock;
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/*
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* first segment of the new buffer
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*/
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static int switch_segment;
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/*
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* at most 256 segments fit into one 32 kb buffer. Even TR-1 cartridges have
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* more than this many segments per track, so better be careful.
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*
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* buffer_struct *buff: buffer to store the formatting coordinates in
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* int start: starting segment for this buffer.
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* int spt: segments per track
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*
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* Note: segment ids are relative to the start of the track here.
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*/
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static void setup_format_buffer(buffer_struct *buff, int start, int spt,
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__u8 gap3)
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{
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int to_do = spt - start;
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TRACE_FUN(ft_t_flow);
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if (to_do > FT_FMT_SEGS_PER_BUF) {
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to_do = FT_FMT_SEGS_PER_BUF;
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}
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buff->ptr = buff->address;
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buff->remaining = to_do * FT_SECTORS_PER_SEGMENT; /* # sectors */
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buff->bytes = buff->remaining * 4; /* need 4 bytes per sector */
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buff->gap3 = gap3;
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buff->segment_id = start;
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buff->next_segment = start + to_do;
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if (buff->next_segment >= spt) {
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buff->next_segment = 0; /* 0 means: stop runner */
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}
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buff->status = waiting; /* tells the isr that it can use
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* this buffer
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*/
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TRACE_EXIT;
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}
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/*
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* start formatting a new track.
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*/
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int ftape_format_track(const unsigned int track, const __u8 gap3)
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{
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unsigned long flags;
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buffer_struct *tail, *head;
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int status;
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TRACE_FUN(ft_t_flow);
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TRACE_CATCH(ftape_ready_wait(ftape_timeout.pause, &status),);
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if (track & 1) {
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if (!(status & QIC_STATUS_AT_EOT)) {
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TRACE_CATCH(ftape_seek_to_eot(),);
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}
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} else {
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if (!(status & QIC_STATUS_AT_BOT)) {
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TRACE_CATCH(ftape_seek_to_bot(),);
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}
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}
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ftape_abort_operation(); /* this sets ft_head = ft_tail = 0 */
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ftape_set_state(formatting);
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TRACE(ft_t_noise,
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"Formatting track %d, logical: from segment %d to %d",
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track, track * ft_segments_per_track,
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(track + 1) * ft_segments_per_track - 1);
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/*
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* initialize the buffer switching protocol for this track
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*/
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head = ftape_get_buffer(ft_queue_head); /* tape isn't running yet */
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tail = ftape_get_buffer(ft_queue_tail); /* tape isn't running yet */
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switch_segment = 0;
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do {
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FT_SIGNAL_EXIT(_DONT_BLOCK);
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setup_format_buffer(tail, switch_segment,
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ft_segments_per_track, gap3);
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switch_segment = tail->next_segment;
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} while ((switch_segment != 0) &&
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((tail = ftape_next_buffer(ft_queue_tail)) != head));
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/* go */
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head->status = formatting;
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TRACE_CATCH(ftape_seek_head_to_track(track),);
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TRACE_CATCH(ftape_command(QIC_LOGICAL_FORWARD),);
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spin_lock_irqsave(&ftape_format_lock, flags);
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TRACE_CATCH(fdc_setup_formatting(head), restore_flags(flags));
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spin_unlock_irqrestore(&ftape_format_lock, flags);
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TRACE_EXIT 0;
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}
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/* return segment id of segment currently being formatted and do the
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* buffer switching stuff.
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*/
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int ftape_format_status(unsigned int *segment_id)
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{
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buffer_struct *tail = ftape_get_buffer(ft_queue_tail);
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int result;
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TRACE_FUN(ft_t_flow);
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while (switch_segment != 0 &&
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ftape_get_buffer(ft_queue_head) != tail) {
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FT_SIGNAL_EXIT(_DONT_BLOCK);
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/* need more buffers, first wait for empty buffer
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*/
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TRACE_CATCH(ftape_wait_segment(formatting),);
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/* don't worry for gap3. If we ever hit this piece of code,
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* then all buffer already have the correct gap3 set!
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*/
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setup_format_buffer(tail, switch_segment,
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ft_segments_per_track, tail->gap3);
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switch_segment = tail->next_segment;
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if (switch_segment != 0) {
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tail = ftape_next_buffer(ft_queue_tail);
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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 || ft_runner_status == do_abort) {
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buffer_struct *head = ftape_get_buffer(ft_queue_head);
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TRACE(ft_t_warn, "Error formatting segment %d",
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ftape_get_buffer(ft_queue_head)->segment_id);
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(void)ftape_abort_operation();
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TRACE_EXIT (head->status != error) ? -EAGAIN : -EIO;
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}
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/*
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* don't care if the timer expires, this is just kind of a
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* "select" operation that lets the calling process sleep
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* until something has happened
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*/
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if (fdc_interrupt_wait(5 * FT_SECOND) < 0) {
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TRACE(ft_t_noise, "End of track %d at segment %d",
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ft_location.track,
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ftape_get_buffer(ft_queue_head)->segment_id);
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result = 1; /* end of track, unlock module */
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} else {
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result = 0;
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}
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/*
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* the calling process should use the seg id to determine
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* which parts of the dma buffers can be safely overwritten
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* with new data.
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*/
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*segment_id = ftape_get_buffer(ft_queue_head)->segment_id;
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/*
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* Internally we start counting segment ids from the start of
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* each track when formatting, but externally we keep them
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* relative to the start of the tape:
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*/
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*segment_id += ft_location.track * ft_segments_per_track;
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TRACE_EXIT result;
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}
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/*
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* The segment id is relative to the start of the tape
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*/
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int ftape_verify_segment(const unsigned int segment_id, SectorMap *bsm)
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{
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int result;
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int verify_done = 0;
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TRACE_FUN(ft_t_flow);
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TRACE(ft_t_noise, "Verifying segment %d", segment_id);
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if (ft_driver_state != verifying) {
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TRACE(ft_t_noise, "calling ftape_abort_operation");
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if (ftape_abort_operation() < 0) {
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TRACE(ft_t_err, "ftape_abort_operation failed");
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TRACE_EXIT -EIO;
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}
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}
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*bsm = 0x00000000;
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ftape_set_state(verifying);
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for (;;) {
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buffer_struct *tail;
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/*
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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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/*
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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 (!verify_done && tail->status == done) {
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/*
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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->soft_error_map |
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tail->hard_error_map) != 0) {
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TRACE(ft_t_info,"bsm[%d] = 0x%08lx",
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segment_id,
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(unsigned long)
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(tail->soft_error_map |
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tail->hard_error_map));
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*bsm = (tail->soft_error_map |
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tail->hard_error_map);
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}
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verify_done = 1;
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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 (!verify_done && tail->status == verifying) {
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if (tail->segment_id == segment_id) {
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switch(ftape_wait_segment(verifying)) {
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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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ftape_abort_operation();
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ftape_set_state(verifying);
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/* be picky */
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TRACE_ABORT(-EIO, ft_t_warn,
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"wait_segment failed");
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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, "verifying wrong segment");
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ftape_abort_operation();
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ftape_set_state(verifying);
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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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if (head->status == error ||
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head->status == verifying) {
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/* no data or overrun error */
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head->status = waiting;
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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 (verify_done) {
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TRACE_EXIT 0;
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}
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/* Now at least one buffer is idle!
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* Restart runner & tape if needed.
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*/
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/* We could optimize the following a little bit. We know that
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* the bad sector map is empty.
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*/
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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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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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switch(result) {
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case 0:
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break;
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case -ETIME:
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case -EINTR:
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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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break;
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default:
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*bsm = EMPTY_SEGMENT;
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TRACE_EXIT 0;
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break;
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}
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}
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head->status = verifying;
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fdc_setup_read_write(head, FDC_VERIFY);
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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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