patch-2.1.66 linux/drivers/char/ftape/lowlevel/ftape-ecc.h

• Lines: 85
• Date: Tue Nov 25 14:45:27 1997
• Orig file: v2.1.65/linux/drivers/char/ftape/lowlevel/ftape-ecc.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.65/linux/drivers/char/ftape/lowlevel/ftape-ecc.h linux/drivers/char/ftape/lowlevel/ftape-ecc.h
@@ -0,0 +1,84 @@
+#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_ */