diff options
Diffstat (limited to 'drivers/char/ftape/zftape/zftape-eof.c')
| -rw-r--r-- | drivers/char/ftape/zftape/zftape-eof.c | 199 |
1 files changed, 0 insertions, 199 deletions
diff --git a/drivers/char/ftape/zftape/zftape-eof.c b/drivers/char/ftape/zftape/zftape-eof.c deleted file mode 100644 index dcadcae..0000000 --- a/drivers/char/ftape/zftape/zftape-eof.c +++ /dev/null @@ -1,199 +0,0 @@ -/* - * I use these routines just to decide when I have to fake a - * volume-table to preserve compatibility to original ftape. - */ -/* - * Copyright (C) 1994-1995 Bas Laarhoven. - * - * Modified for zftape 1996, 1997 Claus 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-eof.c,v $ - * $Revision: 1.2 $ - * $Date: 1997/10/05 19:19:02 $ - * - * This file contains the eof mark handling code - * for the QIC-40/80 floppy-tape driver for Linux. - */ - -#include <linux/string.h> -#include <linux/errno.h> - -#include <linux/zftape.h> - -#include "../zftape/zftape-init.h" -#include "../zftape/zftape-rw.h" -#include "../zftape/zftape-eof.h" - -/* Global vars. - */ - -/* a copy of the failed sector log from the header segment. - */ -eof_mark_union *zft_eof_map; - -/* number of eof marks (entries in bad sector log) on tape. - */ -int zft_nr_eof_marks = -1; - - -/* Local vars. - */ - -static char linux_tape_label[] = "Linux raw format V"; -enum { - min_fmt_version = 1, max_fmt_version = 2 -}; -static unsigned ftape_fmt_version = 0; - - -/* Ftape (mis)uses the bad sector log to record end-of-file marks. - * Initially (when the tape is erased) all entries in the bad sector - * log are added to the tape's bad sector map. The bad sector log then - * is cleared. - * - * The bad sector log normally contains entries of the form: - * even 16-bit word: segment number of bad sector - * odd 16-bit word: encoded date - * There can be a total of 448 entries (1792 bytes). - * - * My guess is that no program is using this bad sector log (the * - * format seems useless as there is no indication of the bad sector - * itself, only the segment) However, if any program does use the bad - * sector log, the format used by ftape will let the program think - * there are some bad sectors and no harm is done. - * - * The eof mark entries that ftape stores in the bad sector log: even - * 16-bit word: segment number of eof mark odd 16-bit word: sector - * number of eof mark [1..32] - * - * The zft_eof_map as maintained is a sorted list of eof mark entries. - * - * - * The tape name field in the header segments is used to store a linux - * tape identification string and a version number. This way the tape - * can be recognized as a Linux raw format tape when using tools under - * other OS's. - * - * 'Wide' QIC tapes (format code 4) don't have a failed sector list - * anymore. That space is used for the (longer) bad sector map that - * now is a variable length list too. We now store our end-of-file - * marker list after the bad-sector-map on tape. The list is delimited - * by a (__u32) 0 entry. - */ - -int zft_ftape_validate_label(char *label) -{ - static char tmp_label[45]; - int result = 0; - TRACE_FUN(ft_t_any); - - memcpy(tmp_label, label, FT_LABEL_SZ); - tmp_label[FT_LABEL_SZ] = '\0'; - TRACE(ft_t_noise, "tape label = `%s'", tmp_label); - ftape_fmt_version = 0; - if (memcmp(label, linux_tape_label, strlen(linux_tape_label)) == 0) { - int pos = strlen(linux_tape_label); - while (label[pos] >= '0' && label[pos] <= '9') { - ftape_fmt_version *= 10; - ftape_fmt_version = label[ pos++] - '0'; - } - result = (ftape_fmt_version >= min_fmt_version && - ftape_fmt_version <= max_fmt_version); - } - TRACE(ft_t_noise, "format version = %d", ftape_fmt_version); - TRACE_EXIT result; -} - -static __u8 * find_end_of_eof_list(__u8 * ptr, __u8 * limit) -{ - while (ptr + 3 < limit) { - - if (get_unaligned((__u32*)ptr)) { - ptr += sizeof(__u32); - } else { - return ptr; - } - } - return NULL; -} - -void zft_ftape_extract_file_marks(__u8* address) -{ - int i; - TRACE_FUN(ft_t_any); - - zft_eof_map = NULL; - if (ft_format_code == fmt_var || ft_format_code == fmt_big) { - __u8* end; - __u8* start = ftape_find_end_of_bsm_list(address); - - zft_nr_eof_marks = 0; - if (start) { - start += 3; /* skip end of list mark */ - end = find_end_of_eof_list(start, - address + FT_SEGMENT_SIZE); - if (end && end - start <= FT_FSL_SIZE) { - zft_nr_eof_marks = ((end - start) / - sizeof(eof_mark_union)); - zft_eof_map = (eof_mark_union *)start; - } else { - TRACE(ft_t_err, - "EOF Mark List is too long or damaged!"); - } - } else { - TRACE(ft_t_err, - "Bad Sector List is too long or damaged !"); - } - } else { - zft_eof_map = (eof_mark_union *)&address[FT_FSL]; - zft_nr_eof_marks = GET2(address, FT_FSL_CNT); - } - TRACE(ft_t_noise, "number of file marks: %d", zft_nr_eof_marks); - if (ftape_fmt_version == 1) { - TRACE(ft_t_info, "swapping version 1 fields"); - /* version 1 format uses swapped sector and segment - * fields, correct that ! - */ - for (i = 0; i < zft_nr_eof_marks; ++i) { - __u16 tmp = GET2(&zft_eof_map[i].mark.segment,0); - PUT2(&zft_eof_map[i].mark.segment, 0, - GET2(&zft_eof_map[i].mark.date,0)); - PUT2(&zft_eof_map[i].mark.date, 0, tmp); - } - } - for (i = 0; i < zft_nr_eof_marks; ++i) { - TRACE(ft_t_noise, "eof mark: %5d/%2d", - GET2(&zft_eof_map[i].mark.segment, 0), - GET2(&zft_eof_map[i].mark.date,0)); - } - TRACE_EXIT; -} - -void zft_clear_ftape_file_marks(void) -{ - TRACE_FUN(ft_t_flow); - /* Clear failed sector log: remove all tape marks. We - * don't use old ftape-style EOF-marks. - */ - TRACE(ft_t_info, "Clearing old ftape's eof map"); - memset(zft_eof_map, 0, zft_nr_eof_marks * sizeof(__u32)); - zft_nr_eof_marks = 0; - PUT2(zft_hseg_buf, FT_FSL_CNT, 0); /* nr of eof-marks */ - zft_header_changed = 1; - zft_update_label(zft_hseg_buf); - TRACE_EXIT; -} |
