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Diffstat (limited to 'drivers/char/ftape/zftape/zftape-rw.c')
-rw-r--r--drivers/char/ftape/zftape/zftape-rw.c375
1 files changed, 0 insertions, 375 deletions
diff --git a/drivers/char/ftape/zftape/zftape-rw.c b/drivers/char/ftape/zftape/zftape-rw.c
deleted file mode 100644
index dab63468688..00000000000
--- a/drivers/char/ftape/zftape/zftape-rw.c
+++ /dev/null
@@ -1,375 +0,0 @@
-/*
- * Copyright (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/zftape/zftape-rw.c,v $
- * $Revision: 1.2 $
- * $Date: 1997/10/05 19:19:08 $
- *
- * This file contains some common code for the r/w code for
- * zftape.
- */
-
-#include <linux/errno.h>
-#include <linux/mm.h>
-
-#include <linux/zftape.h>
-#include "../zftape/zftape-init.h"
-#include "../zftape/zftape-eof.h"
-#include "../zftape/zftape-ctl.h"
-#include "../zftape/zftape-write.h"
-#include "../zftape/zftape-read.h"
-#include "../zftape/zftape-rw.h"
-#include "../zftape/zftape-vtbl.h"
-
-/* Global vars.
- */
-
-__u8 *zft_deblock_buf;
-__u8 *zft_hseg_buf;
-int zft_deblock_segment = -1;
-zft_status_enum zft_io_state = zft_idle;
-int zft_header_changed;
-int zft_qic113; /* conform to old specs. and old zftape */
-int zft_use_compression;
-zft_position zft_pos = {
- -1, /* seg_pos */
- 0, /* seg_byte_pos */
- 0, /* tape_pos */
- 0 /* volume_pos */
-};
-unsigned int zft_blk_sz = CONFIG_ZFT_DFLT_BLK_SZ;
-__s64 zft_capacity;
-
-unsigned int zft_written_segments;
-int zft_label_changed;
-
-/* Local vars.
- */
-
-unsigned int zft_get_seg_sz(unsigned int segment)
-{
- int size;
- TRACE_FUN(ft_t_any);
-
- size = FT_SEGMENT_SIZE -
- count_ones(ftape_get_bad_sector_entry(segment))*FT_SECTOR_SIZE;
- if (size > 0) {
- TRACE_EXIT (unsigned)size;
- } else {
- TRACE_EXIT 0;
- }
-}
-
-/* ftape_set_flags(). Claus-Justus Heine, 1994/1995
- */
-void zft_set_flags(unsigned minor_unit)
-{
- TRACE_FUN(ft_t_flow);
-
- zft_use_compression = zft_qic_mode = 0;
- switch (minor_unit & ZFT_MINOR_OP_MASK) {
- case (ZFT_Q80_MODE | ZFT_ZIP_MODE):
- case ZFT_ZIP_MODE:
- zft_use_compression = 1;
- case 0:
- case ZFT_Q80_MODE:
- zft_qic_mode = 1;
- if (zft_mt_compression) { /* override the default */
- zft_use_compression = 1;
- }
- break;
- case ZFT_RAW_MODE:
- TRACE(ft_t_noise, "switching to raw mode");
- break;
- default:
- TRACE(ft_t_warn, "Warning:\n"
- KERN_INFO "Wrong combination of minor device bits.\n"
- KERN_INFO "Switching to raw read-only mode.");
- zft_write_protected = 1;
- break;
- }
- TRACE_EXIT;
-}
-
-/* computes the segment and byte offset inside the segment
- * corresponding to tape_pos.
- *
- * tape_pos gives the offset in bytes from the beginning of the
- * ft_first_data_segment *seg_byte_pos is the offset in the current
- * segment in bytes
- *
- * Of, if this routine was called often one should cache the last data
- * pos it was called with, but actually this is only needed in
- * ftape_seek_block(), that is, almost never.
- */
-int zft_calc_seg_byte_coord(int *seg_byte_pos, __s64 tape_pos)
-{
- int segment;
- int seg_sz;
- TRACE_FUN(ft_t_flow);
-
- if (tape_pos == 0) {
- *seg_byte_pos = 0;
- segment = ft_first_data_segment;
- } else {
- seg_sz = 0;
-
- for (segment = ft_first_data_segment;
- ((tape_pos > 0) && (segment <= ft_last_data_segment));
- segment++) {
- seg_sz = zft_get_seg_sz(segment);
- tape_pos -= seg_sz;
- }
- if(tape_pos >= 0) {
- /* the case tape_pos > != 0 means that the
- * argument tape_pos lies beyond the EOT.
- */
- *seg_byte_pos= 0;
- } else { /* tape_pos < 0 */
- segment--;
- *seg_byte_pos= tape_pos + seg_sz;
- }
- }
- TRACE_EXIT(segment);
-}
-
-/* ftape_calc_tape_pos().
- *
- * computes the offset in bytes from the beginning of the
- * ft_first_data_segment inverse to ftape_calc_seg_byte_coord
- *
- * We should do some caching. But how:
- *
- * Each time the header segments are read in, this routine is called
- * with ft_tracks_per_tape*segments_per_track argumnet. So this should be
- * the time to reset the cache.
- *
- * Also, it might be in the future that the bad sector map gets
- * changed. -> reset the cache
- */
-static int seg_pos;
-static __s64 tape_pos;
-
-__s64 zft_get_capacity(void)
-{
- seg_pos = ft_first_data_segment;
- tape_pos = 0;
-
- while (seg_pos <= ft_last_data_segment) {
- tape_pos += zft_get_seg_sz(seg_pos ++);
- }
- return tape_pos;
-}
-
-__s64 zft_calc_tape_pos(int segment)
-{
- int d1, d2, d3;
- TRACE_FUN(ft_t_any);
-
- if (segment > ft_last_data_segment) {
- TRACE_EXIT zft_capacity;
- }
- if (segment < ft_first_data_segment) {
- TRACE_EXIT 0;
- }
- d2 = segment - seg_pos;
- if (-d2 > 10) {
- d1 = segment - ft_first_data_segment;
- if (-d2 > d1) {
- tape_pos = 0;
- seg_pos = ft_first_data_segment;
- d2 = d1;
- }
- }
- if (d2 > 10) {
- d3 = ft_last_data_segment - segment;
- if (d2 > d3) {
- tape_pos = zft_capacity;
- seg_pos = ft_last_data_segment + 1;
- d2 = -d3;
- }
- }
- if (d2 > 0) {
- while (seg_pos < segment) {
- tape_pos += zft_get_seg_sz(seg_pos++);
- }
- } else {
- while (seg_pos > segment) {
- tape_pos -= zft_get_seg_sz(--seg_pos);
- }
- }
- TRACE(ft_t_noise, "new cached pos: %d", seg_pos);
-
- TRACE_EXIT tape_pos;
-}
-
-/* copy Z-label string to buffer, keeps track of the correct offset in
- * `buffer'
- */
-void zft_update_label(__u8 *buffer)
-{
- TRACE_FUN(ft_t_flow);
-
- if (strncmp(&buffer[FT_LABEL], ZFTAPE_LABEL,
- sizeof(ZFTAPE_LABEL)-1) != 0) {
- TRACE(ft_t_info, "updating label from \"%s\" to \"%s\"",
- &buffer[FT_LABEL], ZFTAPE_LABEL);
- strcpy(&buffer[FT_LABEL], ZFTAPE_LABEL);
- memset(&buffer[FT_LABEL] + sizeof(ZFTAPE_LABEL) - 1, ' ',
- FT_LABEL_SZ - sizeof(ZFTAPE_LABEL + 1));
- PUT4(buffer, FT_LABEL_DATE, 0);
- zft_label_changed = zft_header_changed = 1; /* changed */
- }
- TRACE_EXIT;
-}
-
-int zft_verify_write_segments(unsigned int segment,
- __u8 *data, size_t size,
- __u8 *buffer)
-{
- int result;
- __u8 *write_buf;
- __u8 *src_buf;
- int single;
- int seg_pos;
- int seg_sz;
- int remaining;
- ft_write_mode_t write_mode;
- TRACE_FUN(ft_t_flow);
-
- seg_pos = segment;
- seg_sz = zft_get_seg_sz(seg_pos);
- src_buf = data;
- single = size <= seg_sz;
- remaining = size;
- do {
- TRACE(ft_t_noise, "\n"
- KERN_INFO "remaining: %d\n"
- KERN_INFO "seg_sz : %d\n"
- KERN_INFO "segment : %d",
- remaining, seg_sz, seg_pos);
- if (remaining == seg_sz) {
- write_buf = src_buf;
- write_mode = single ? FT_WR_SINGLE : FT_WR_MULTI;
- remaining = 0;
- } else if (remaining > seg_sz) {
- write_buf = src_buf;
- write_mode = FT_WR_ASYNC; /* don't start tape */
- remaining -= seg_sz;
- } else { /* remaining < seg_sz */
- write_buf = buffer;
- memcpy(write_buf, src_buf, remaining);
- memset(&write_buf[remaining],'\0',seg_sz-remaining);
- write_mode = single ? FT_WR_SINGLE : FT_WR_MULTI;
- remaining = 0;
- }
- if ((result = ftape_write_segment(seg_pos,
- write_buf,
- write_mode)) != seg_sz) {
- TRACE(ft_t_err, "Error: "
- "Couldn't write segment %d", seg_pos);
- TRACE_EXIT result < 0 ? result : -EIO; /* bail out */
- }
- zft_written_segments ++;
- seg_sz = zft_get_seg_sz(++seg_pos);
- src_buf += result;
- } while (remaining > 0);
- if (ftape_get_status()->fti_state == writing) {
- TRACE_CATCH(ftape_loop_until_writes_done(),);
- TRACE_CATCH(ftape_abort_operation(),);
- zft_prevent_flush();
- }
- seg_pos = segment;
- src_buf = data;
- remaining = size;
- do {
- TRACE_CATCH(result = ftape_read_segment(seg_pos, buffer,
- single ? FT_RD_SINGLE
- : FT_RD_AHEAD),);
- if (memcmp(src_buf, buffer,
- remaining > result ? result : remaining) != 0) {
- TRACE_ABORT(-EIO, ft_t_err,
- "Failed to verify written segment %d",
- seg_pos);
- }
- remaining -= result;
- TRACE(ft_t_noise, "verify successful:\n"
- KERN_INFO "segment : %d\n"
- KERN_INFO "segsize : %d\n"
- KERN_INFO "remaining: %d",
- seg_pos, result, remaining);
- src_buf += seg_sz;
- seg_pos++;
- } while (remaining > 0);
- TRACE_EXIT size;
-}
-
-
-/* zft_erase(). implemented compression-handling
- *
- * calculate the first data-segment when using/not using compression.
- *
- * update header-segment and compression-map-segment.
- */
-int zft_erase(void)
-{
- int result = 0;
- TRACE_FUN(ft_t_flow);
-
- if (!zft_header_read) {
- TRACE_CATCH(zft_vmalloc_once((void **)&zft_hseg_buf,
- FT_SEGMENT_SIZE),);
- /* no need to read the vtbl and compression map */
- TRACE_CATCH(ftape_read_header_segment(zft_hseg_buf),);
- if ((zft_old_ftape =
- zft_ftape_validate_label(&zft_hseg_buf[FT_LABEL]))) {
- zft_ftape_extract_file_marks(zft_hseg_buf);
- }
- TRACE(ft_t_noise,
- "ft_first_data_segment: %d, ft_last_data_segment: %d",
- ft_first_data_segment, ft_last_data_segment);
- zft_qic113 = (ft_format_code != fmt_normal &&
- ft_format_code != fmt_1100ft &&
- ft_format_code != fmt_425ft);
- }
- if (zft_old_ftape) {
- zft_clear_ftape_file_marks();
- zft_old_ftape = 0; /* no longer old ftape */
- }
- PUT2(zft_hseg_buf, FT_CMAP_START, 0);
- zft_volume_table_changed = 1;
- zft_capacity = zft_get_capacity();
- zft_init_vtbl();
- /* the rest must be done in ftape_update_header_segments
- */
- zft_header_read = 1;
- zft_header_changed = 1; /* force update of timestamp */
- result = zft_update_header_segments();
-
- ftape_abort_operation();
-
- zft_reset_position(&zft_pos);
- zft_set_flags (zft_unit);
- TRACE_EXIT result;
-}
-
-unsigned int zft_get_time(void)
-{
- unsigned int date = FT_TIME_STAMP(2097, 11, 30, 23, 59, 59); /* fun */
- return date;
-}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-11 08:04:07 +0000