forked from luck/tmp_suning_uos_patched
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!
85 lines
2.6 KiB
C
85 lines
2.6 KiB
C
#ifndef _FTAPE_ECC_H_
|
|
#define _FTAPE_ECC_H_
|
|
|
|
/*
|
|
* Copyright (C) 1993 Ning and David Mosberger.
|
|
* Original:
|
|
* Copyright (C) 1993 Bas Laarhoven.
|
|
* Copyright (C) 1992 David L. Brown, Jr.
|
|
|
|
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-ecc.h,v $
|
|
* $Revision: 1.2 $
|
|
* $Date: 1997/10/05 19:18:11 $
|
|
*
|
|
* This file contains the definitions for the
|
|
* Reed-Solomon error correction code
|
|
* for the QIC-40/80 tape streamer device driver.
|
|
*/
|
|
|
|
#include "../lowlevel/ftape-bsm.h"
|
|
|
|
#define BAD_CLEAR(entry) ((entry)=0)
|
|
#define BAD_SET(entry,sector) ((entry)|=(1<<(sector)))
|
|
#define BAD_CHECK(entry,sector) ((entry)&(1<<(sector)))
|
|
|
|
/*
|
|
* Return values for ecc_correct_data:
|
|
*/
|
|
enum {
|
|
ECC_OK, /* Data was correct. */
|
|
ECC_CORRECTED, /* Correctable error in data. */
|
|
ECC_FAILED, /* Could not correct data. */
|
|
};
|
|
|
|
/*
|
|
* Representation of an in memory segment. MARKED_BAD lists the
|
|
* sectors that were marked bad during formatting. If the N-th sector
|
|
* in a segment is marked bad, bit 1<<N will be set in MARKED_BAD.
|
|
* The sectors should be read in from the disk and packed, as if the
|
|
* bad sectors were not there, and the segment just contained fewer
|
|
* sectors. READ_SECTORS is a bitmap of errors encountered while
|
|
* reading the data. These offsets are relative to the packed data.
|
|
* BLOCKS is a count of the sectors not marked bad. This is just to
|
|
* prevent having to count the zero bits in MARKED_BAD each time this
|
|
* is needed. DATA is the actual sector packed data from (or to) the
|
|
* tape.
|
|
*/
|
|
struct memory_segment {
|
|
SectorMap marked_bad;
|
|
SectorMap read_bad;
|
|
int blocks;
|
|
__u8 *data;
|
|
SectorMap corrected;
|
|
};
|
|
|
|
/*
|
|
* ecc.c defined global variables:
|
|
*/
|
|
#ifdef TEST
|
|
extern int ftape_ecc_tracing;
|
|
#endif
|
|
|
|
/*
|
|
* ecc.c defined global functions:
|
|
*/
|
|
extern int ftape_ecc_correct_data(struct memory_segment *data);
|
|
extern int ftape_ecc_set_segment_parity(struct memory_segment *data);
|
|
|
|
#endif /* _FTAPE_ECC_H_ */
|