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1275 |
phoenix |
/*
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* Copyright (C) 1994-1996 Bas Laarhoven,
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* (C) 1996-1997 Claus 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: /home/marcus/revision_ctrl_test/oc_cvs/cvs/or1k/linux/linux-2.4/drivers/char/ftape/lowlevel/ftape-bsm.c,v $
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* $Revision: 1.1.1.1 $
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* $Date: 2004-04-15 02:02:36 $
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*
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* This file contains the bad-sector map handling code for
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* the QIC-117 floppy tape driver for Linux.
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* QIC-40, QIC-80, QIC-3010 and QIC-3020 maps are implemented.
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*/
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#include <linux/string.h>
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#include <linux/ftape.h>
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#include "../lowlevel/ftape-tracing.h"
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#include "../lowlevel/ftape-bsm.h"
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#include "../lowlevel/ftape-ctl.h"
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#include "../lowlevel/ftape-rw.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 __u8 *bad_sector_map;
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static SectorCount *bsm_hash_ptr;
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typedef enum {
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forward, backward
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} mode_type;
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#if 0
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/* fix_tape converts a normal QIC-80 tape into a 'wide' tape.
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* For testing purposes only !
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*/
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void fix_tape(__u8 * buffer, ft_format_type new_code)
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{
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static __u8 list[BAD_SECTOR_MAP_SIZE];
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SectorMap *src_ptr = (SectorMap *) list;
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__u8 *dst_ptr = bad_sector_map;
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SectorMap map;
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unsigned int sector = 1;
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int i;
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if (format_code != fmt_var && format_code != fmt_big) {
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memcpy(list, bad_sector_map, sizeof(list));
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memset(bad_sector_map, 0, sizeof(bad_sector_map));
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while ((__u8 *) src_ptr - list < sizeof(list)) {
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map = *src_ptr++;
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if (map == EMPTY_SEGMENT) {
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*(SectorMap *) dst_ptr = 0x800000 + sector;
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dst_ptr += 3;
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sector += SECTORS_PER_SEGMENT;
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} else {
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for (i = 0; i < SECTORS_PER_SEGMENT; ++i) {
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if (map & 1) {
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*(SewctorMap *) dst_ptr = sector;
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dst_ptr += 3;
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}
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map >>= 1;
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++sector;
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}
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}
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}
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}
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bad_sector_map_changed = 1;
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*(buffer + 4) = new_code; /* put new format code */
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if (format_code != fmt_var && new_code == fmt_big) {
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PUT4(buffer, FT_6_HSEG_1, (__u32)GET2(buffer, 6));
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PUT4(buffer, FT_6_HSEG_2, (__u32)GET2(buffer, 8));
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PUT4(buffer, FT_6_FRST_SEG, (__u32)GET2(buffer, 10));
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PUT4(buffer, FT_6_LAST_SEG, (__u32)GET2(buffer, 12));
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memset(buffer+6, '\0', 8);
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}
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format_code = new_code;
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}
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#endif
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/* given buffer that contains a header segment, find the end of
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* of the bsm list
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*/
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__u8 * ftape_find_end_of_bsm_list(__u8 * address)
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{
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__u8 *ptr = address + FT_HEADER_END; /* start of bsm list */
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__u8 *limit = address + FT_SEGMENT_SIZE;
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while (ptr + 2 < limit) {
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if (ptr[0] || ptr[1] || ptr[2]) {
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ptr += 3;
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} else {
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return ptr;
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}
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}
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return NULL;
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}
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static inline void put_sector(SectorCount *ptr, unsigned int sector)
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{
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ptr->bytes[0] = sector & 0xff;
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sector >>= 8;
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ptr->bytes[1] = sector & 0xff;
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sector >>= 8;
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ptr->bytes[2] = sector & 0xff;
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}
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static inline unsigned int get_sector(SectorCount *ptr)
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{
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#if 1
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unsigned int sector;
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sector = ptr->bytes[0];
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sector += ptr->bytes[1] << 8;
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sector += ptr->bytes[2] << 16;
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return sector;
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#else
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/* GET4 gets the next four bytes in Intel little endian order
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* and converts them to host byte order and handles unaligned
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* access.
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*/
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return (GET4(ptr, 0) & 0x00ffffff); /* back to host byte order */
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#endif
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}
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static void bsm_debug_fake(void)
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{
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/* for testing of bad sector handling at end of tape
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*/
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#if 0
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ftape_put_bad_sector_entry(segments_per_track * tracks_per_tape - 3,
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0x000003e0;
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ftape_put_bad_sector_entry(segments_per_track * tracks_per_tape - 2,
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0xff3fffff;
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ftape_put_bad_sector_entry(segments_per_track * tracks_per_tape - 1,
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0xffffe000;
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#endif
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/* Enable to test bad sector handling
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*/
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#if 0
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ftape_put_bad_sector_entry(30, 0xfffffffe)
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ftape_put_bad_sector_entry(32, 0x7fffffff);
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ftape_put_bad_sector_entry(34, 0xfffeffff);
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ftape_put_bad_sector_entry(36, 0x55555555);
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ftape_put_bad_sector_entry(38, 0xffffffff);
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ftape_put_bad_sector_entry(50, 0xffff0000);
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ftape_put_bad_sector_entry(51, 0xffffffff);
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ftape_put_bad_sector_entry(52, 0xffffffff);
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ftape_put_bad_sector_entry(53, 0x0000ffff);
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#endif
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/* Enable when testing multiple volume tar dumps.
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*/
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#if 0
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{
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int i;
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for (i = ft_first_data_segment;
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i <= ft_last_data_segment - 7; ++i) {
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ftape_put_bad_sector_entry(i, EMPTY_SEGMENT);
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}
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}
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#endif
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/* Enable when testing bit positions in *_error_map
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*/
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#if 0
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{
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int i;
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for (i = first_data_segment; i <= last_data_segment; ++i) {
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ftape_put_bad_sector_entry(i,
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ftape_get_bad_sector_entry(i)
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| 0x00ff00ff);
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}
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}
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#endif
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}
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static void print_bad_sector_map(void)
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{
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unsigned int good_sectors;
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unsigned int total_bad = 0;
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int i;
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TRACE_FUN(ft_t_flow);
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if (ft_format_code == fmt_big ||
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ft_format_code == fmt_var ||
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ft_format_code == fmt_1100ft) {
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SectorCount *ptr = (SectorCount *)bad_sector_map;
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unsigned int sector;
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while((sector = get_sector(ptr++)) != 0) {
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if ((ft_format_code == fmt_big ||
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ft_format_code == fmt_var) &&
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sector & 0x800000) {
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total_bad += FT_SECTORS_PER_SEGMENT - 3;
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TRACE(ft_t_noise, "bad segment at sector: %6d",
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sector & 0x7fffff);
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} else {
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++total_bad;
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TRACE(ft_t_noise, "bad sector: %6d", sector);
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}
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}
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/* Display old ftape's end-of-file marks
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*/
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while ((sector = get_unaligned(((__u16*)ptr)++)) != 0) {
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TRACE(ft_t_noise, "Old ftape eof mark: %4d/%2d",
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sector, get_unaligned(((__u16*)ptr)++));
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}
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} else { /* fixed size format */
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for (i = ft_first_data_segment;
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i < (int)(ft_segments_per_track * ft_tracks_per_tape); ++i) {
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SectorMap map = ((SectorMap *) bad_sector_map)[i];
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if (map) {
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TRACE(ft_t_noise,
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"bsm for segment %4d: 0x%08x", i, (unsigned int)map);
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total_bad += ((map == EMPTY_SEGMENT)
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? FT_SECTORS_PER_SEGMENT - 3
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: count_ones(map));
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}
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| 237 |
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}
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| 238 |
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}
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good_sectors =
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((ft_segments_per_track * ft_tracks_per_tape - ft_first_data_segment)
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* (FT_SECTORS_PER_SEGMENT - 3)) - total_bad;
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TRACE(ft_t_info, "%d Kb usable on this tape", good_sectors);
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if (total_bad == 0) {
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TRACE(ft_t_info,
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"WARNING: this tape has no bad blocks registered !");
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} else {
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TRACE(ft_t_info, "%d bad sectors", total_bad);
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}
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| 249 |
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TRACE_EXIT;
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}
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void ftape_extract_bad_sector_map(__u8 * buffer)
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{
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TRACE_FUN(ft_t_any);
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| 256 |
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| 257 |
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/* Fill the bad sector map with the contents of buffer.
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| 258 |
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*/
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| 259 |
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if (ft_format_code == fmt_var || ft_format_code == fmt_big) {
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| 260 |
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/* QIC-3010/3020 and wide QIC-80 tapes no longer have a failed
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* sector log but use this area to extend the bad sector map.
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*/
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| 263 |
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bad_sector_map = &buffer[FT_HEADER_END];
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| 264 |
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} else {
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| 265 |
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/* non-wide QIC-80 tapes have a failed sector log area that
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| 266 |
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* mustn't be included in the bad sector map.
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| 267 |
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*/
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| 268 |
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bad_sector_map = &buffer[FT_FSL + FT_FSL_SIZE];
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| 269 |
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}
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| 270 |
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if (ft_format_code == fmt_1100ft ||
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| 271 |
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ft_format_code == fmt_var ||
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| 272 |
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ft_format_code == fmt_big) {
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| 273 |
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bsm_hash_ptr = (SectorCount *)bad_sector_map;
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| 274 |
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} else {
|
| 275 |
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bsm_hash_ptr = NULL;
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| 276 |
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}
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| 277 |
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bsm_debug_fake();
|
| 278 |
|
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if (TRACE_LEVEL >= ft_t_info) {
|
| 279 |
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print_bad_sector_map();
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| 280 |
|
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}
|
| 281 |
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TRACE_EXIT;
|
| 282 |
|
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}
|
| 283 |
|
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|
| 284 |
|
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static inline SectorMap cvt2map(unsigned int sector)
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| 285 |
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{
|
| 286 |
|
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return 1 << (((sector & 0x7fffff) - 1) % FT_SECTORS_PER_SEGMENT);
|
| 287 |
|
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}
|
| 288 |
|
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|
| 289 |
|
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static inline int cvt2segment(unsigned int sector)
|
| 290 |
|
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{
|
| 291 |
|
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return ((sector & 0x7fffff) - 1) / FT_SECTORS_PER_SEGMENT;
|
| 292 |
|
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}
|
| 293 |
|
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|
| 294 |
|
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static int forward_seek_entry(int segment_id,
|
| 295 |
|
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SectorCount **ptr,
|
| 296 |
|
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SectorMap *map)
|
| 297 |
|
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{
|
| 298 |
|
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unsigned int sector;
|
| 299 |
|
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int segment;
|
| 300 |
|
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|
| 301 |
|
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do {
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| 302 |
|
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sector = get_sector((*ptr)++);
|
| 303 |
|
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segment = cvt2segment(sector);
|
| 304 |
|
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} while (sector != 0 && segment < segment_id);
|
| 305 |
|
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(*ptr) --; /* point to first sector >= segment_id */
|
| 306 |
|
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/* Get all sectors in segment_id
|
| 307 |
|
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*/
|
| 308 |
|
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if (sector == 0 || segment != segment_id) {
|
| 309 |
|
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*map = 0;
|
| 310 |
|
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return 0;
|
| 311 |
|
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} else if ((sector & 0x800000) &&
|
| 312 |
|
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(ft_format_code == fmt_var || ft_format_code == fmt_big)) {
|
| 313 |
|
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*map = EMPTY_SEGMENT;
|
| 314 |
|
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return FT_SECTORS_PER_SEGMENT;
|
| 315 |
|
|
} else {
|
| 316 |
|
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int count = 1;
|
| 317 |
|
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SectorCount *tmp_ptr = (*ptr) + 1;
|
| 318 |
|
|
|
| 319 |
|
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*map = cvt2map(sector);
|
| 320 |
|
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while ((sector = get_sector(tmp_ptr++)) != 0 &&
|
| 321 |
|
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(segment = cvt2segment(sector)) == segment_id) {
|
| 322 |
|
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*map |= cvt2map(sector);
|
| 323 |
|
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++count;
|
| 324 |
|
|
}
|
| 325 |
|
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return count;
|
| 326 |
|
|
}
|
| 327 |
|
|
}
|
| 328 |
|
|
|
| 329 |
|
|
static int backwards_seek_entry(int segment_id,
|
| 330 |
|
|
SectorCount **ptr,
|
| 331 |
|
|
SectorMap *map)
|
| 332 |
|
|
{
|
| 333 |
|
|
unsigned int sector;
|
| 334 |
|
|
int segment; /* max unsigned int */
|
| 335 |
|
|
|
| 336 |
|
|
if (*ptr <= (SectorCount *)bad_sector_map) {
|
| 337 |
|
|
*map = 0;
|
| 338 |
|
|
return 0;
|
| 339 |
|
|
}
|
| 340 |
|
|
do {
|
| 341 |
|
|
sector = get_sector(--(*ptr));
|
| 342 |
|
|
segment = cvt2segment(sector);
|
| 343 |
|
|
} while (*ptr > (SectorCount *)bad_sector_map && segment > segment_id);
|
| 344 |
|
|
if (segment > segment_id) { /* at start of list, no entry found */
|
| 345 |
|
|
*map = 0;
|
| 346 |
|
|
return 0;
|
| 347 |
|
|
} else if (segment < segment_id) {
|
| 348 |
|
|
/* before smaller entry, adjust for overshoot */
|
| 349 |
|
|
(*ptr) ++;
|
| 350 |
|
|
*map = 0;
|
| 351 |
|
|
return 0;
|
| 352 |
|
|
} else if ((sector & 0x800000) &&
|
| 353 |
|
|
(ft_format_code == fmt_big || ft_format_code == fmt_var)) {
|
| 354 |
|
|
*map = EMPTY_SEGMENT;
|
| 355 |
|
|
return FT_SECTORS_PER_SEGMENT;
|
| 356 |
|
|
} else { /* get all sectors in segment_id */
|
| 357 |
|
|
int count = 1;
|
| 358 |
|
|
|
| 359 |
|
|
*map = cvt2map(sector);
|
| 360 |
|
|
while(*ptr > (SectorCount *)bad_sector_map) {
|
| 361 |
|
|
sector = get_sector(--(*ptr));
|
| 362 |
|
|
segment = cvt2segment(sector);
|
| 363 |
|
|
if (segment != segment_id) {
|
| 364 |
|
|
break;
|
| 365 |
|
|
}
|
| 366 |
|
|
*map |= cvt2map(sector);
|
| 367 |
|
|
++count;
|
| 368 |
|
|
}
|
| 369 |
|
|
if (segment < segment_id) {
|
| 370 |
|
|
(*ptr) ++;
|
| 371 |
|
|
}
|
| 372 |
|
|
return count;
|
| 373 |
|
|
}
|
| 374 |
|
|
}
|
| 375 |
|
|
|
| 376 |
|
|
void ftape_put_bad_sector_entry(int segment_id, SectorMap new_map)
|
| 377 |
|
|
{
|
| 378 |
|
|
SectorCount *ptr = (SectorCount *)bad_sector_map;
|
| 379 |
|
|
int count;
|
| 380 |
|
|
int new_count;
|
| 381 |
|
|
SectorMap map;
|
| 382 |
|
|
TRACE_FUN(ft_t_any);
|
| 383 |
|
|
|
| 384 |
|
|
if (ft_format_code == fmt_1100ft ||
|
| 385 |
|
|
ft_format_code == fmt_var ||
|
| 386 |
|
|
ft_format_code == fmt_big) {
|
| 387 |
|
|
count = forward_seek_entry(segment_id, &ptr, &map);
|
| 388 |
|
|
new_count = count_ones(new_map);
|
| 389 |
|
|
/* If format code == 4 put empty segment instead of 32
|
| 390 |
|
|
* bad sectors.
|
| 391 |
|
|
*/
|
| 392 |
|
|
if (ft_format_code == fmt_var || ft_format_code == fmt_big) {
|
| 393 |
|
|
if (new_count == FT_SECTORS_PER_SEGMENT) {
|
| 394 |
|
|
new_count = 1;
|
| 395 |
|
|
}
|
| 396 |
|
|
if (count == FT_SECTORS_PER_SEGMENT) {
|
| 397 |
|
|
count = 1;
|
| 398 |
|
|
}
|
| 399 |
|
|
}
|
| 400 |
|
|
if (count != new_count) {
|
| 401 |
|
|
/* insert (or delete if < 0) new_count - count
|
| 402 |
|
|
* entries. Move trailing part of list
|
| 403 |
|
|
* including terminating 0.
|
| 404 |
|
|
*/
|
| 405 |
|
|
SectorCount *hi_ptr = ptr;
|
| 406 |
|
|
|
| 407 |
|
|
do {
|
| 408 |
|
|
} while (get_sector(hi_ptr++) != 0);
|
| 409 |
|
|
/* Note: ptr is of type byte *, and each bad sector
|
| 410 |
|
|
* consumes 3 bytes.
|
| 411 |
|
|
*/
|
| 412 |
|
|
memmove(ptr + new_count, ptr + count,
|
| 413 |
|
|
(size_t)(hi_ptr - (ptr + count))*sizeof(SectorCount));
|
| 414 |
|
|
}
|
| 415 |
|
|
TRACE(ft_t_noise, "putting map 0x%08x at %p, segment %d",
|
| 416 |
|
|
(unsigned int)new_map, ptr, segment_id);
|
| 417 |
|
|
if (new_count == 1 && new_map == EMPTY_SEGMENT) {
|
| 418 |
|
|
put_sector(ptr++, (0x800001 +
|
| 419 |
|
|
segment_id *
|
| 420 |
|
|
FT_SECTORS_PER_SEGMENT));
|
| 421 |
|
|
} else {
|
| 422 |
|
|
int i = 0;
|
| 423 |
|
|
|
| 424 |
|
|
while (new_map) {
|
| 425 |
|
|
if (new_map & 1) {
|
| 426 |
|
|
put_sector(ptr++,
|
| 427 |
|
|
1 + segment_id *
|
| 428 |
|
|
FT_SECTORS_PER_SEGMENT + i);
|
| 429 |
|
|
}
|
| 430 |
|
|
++i;
|
| 431 |
|
|
new_map >>= 1;
|
| 432 |
|
|
}
|
| 433 |
|
|
}
|
| 434 |
|
|
} else {
|
| 435 |
|
|
((SectorMap *) bad_sector_map)[segment_id] = new_map;
|
| 436 |
|
|
}
|
| 437 |
|
|
TRACE_EXIT;
|
| 438 |
|
|
}
|
| 439 |
|
|
|
| 440 |
|
|
SectorMap ftape_get_bad_sector_entry(int segment_id)
|
| 441 |
|
|
{
|
| 442 |
|
|
if (ft_used_header_segment == -1) {
|
| 443 |
|
|
/* When reading header segment we'll need a blank map.
|
| 444 |
|
|
*/
|
| 445 |
|
|
return 0;
|
| 446 |
|
|
} else if (bsm_hash_ptr != NULL) {
|
| 447 |
|
|
/* Invariants:
|
| 448 |
|
|
* map - mask value returned on last call.
|
| 449 |
|
|
* bsm_hash_ptr - points to first sector greater or equal to
|
| 450 |
|
|
* first sector in last_referenced segment.
|
| 451 |
|
|
* last_referenced - segment id used in the last call,
|
| 452 |
|
|
* sector and map belong to this id.
|
| 453 |
|
|
* This code is designed for sequential access and retries.
|
| 454 |
|
|
* For true random access it may have to be redesigned.
|
| 455 |
|
|
*/
|
| 456 |
|
|
static int last_reference = -1;
|
| 457 |
|
|
static SectorMap map;
|
| 458 |
|
|
|
| 459 |
|
|
if (segment_id > last_reference) {
|
| 460 |
|
|
/* Skip all sectors before segment_id
|
| 461 |
|
|
*/
|
| 462 |
|
|
forward_seek_entry(segment_id, &bsm_hash_ptr, &map);
|
| 463 |
|
|
} else if (segment_id < last_reference) {
|
| 464 |
|
|
/* Skip backwards until begin of buffer or
|
| 465 |
|
|
* first sector in segment_id
|
| 466 |
|
|
*/
|
| 467 |
|
|
backwards_seek_entry(segment_id, &bsm_hash_ptr, &map);
|
| 468 |
|
|
} /* segment_id == last_reference : keep map */
|
| 469 |
|
|
last_reference = segment_id;
|
| 470 |
|
|
return map;
|
| 471 |
|
|
} else {
|
| 472 |
|
|
return ((SectorMap *) bad_sector_map)[segment_id];
|
| 473 |
|
|
}
|
| 474 |
|
|
}
|
| 475 |
|
|
|
| 476 |
|
|
/* This is simply here to prevent us from overwriting other kernel
|
| 477 |
|
|
* data. Writes will result in NULL Pointer dereference.
|
| 478 |
|
|
*/
|
| 479 |
|
|
void ftape_init_bsm(void)
|
| 480 |
|
|
{
|
| 481 |
|
|
bad_sector_map = NULL;
|
| 482 |
|
|
bsm_hash_ptr = NULL;
|
| 483 |
|
|
}
|
