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/* $OpenBSD: rf_evenodd_dagfuncs.h,v 1.2 1999/02/16 00:02:45 niklas Exp $ */
/* $NetBSD: rf_evenodd_dagfuncs.h,v 1.2 1999/02/05 00:06:11 oster Exp $ */
/*
* rf_evenodd_dagfuncs.h
*/
/*
* Copyright (c) 1996 Carnegie-Mellon University.
* All rights reserved.
*
* Author: Chang-Ming Wu
*
* Permission to use, copy, modify and distribute this software and
* its documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*/
#ifndef _RF__RF_EVENODD_DAGFUNCS_H_
#define _RF__RF_EVENODD_DAGFUNCS_H_
extern RF_RedFuncs_t rf_EOSmallWriteEFuncs;
extern RF_RedFuncs_t rf_EOSmallWritePFuncs;
extern RF_RedFuncs_t rf_eoERecoveryFuncs;
extern RF_RedFuncs_t rf_eoPRecoveryFuncs;
extern RF_RedFuncs_t rf_eoERecoveryFuncs;
int rf_RegularPEFunc(RF_DagNode_t * node);
int rf_RegularONEFunc(RF_DagNode_t * node);
int rf_SimpleONEFunc(RF_DagNode_t * node);
void rf_RegularESubroutine(RF_DagNode_t * node, char *ebuf);
int rf_RegularEFunc(RF_DagNode_t * node);
void rf_DegrESubroutine(RF_DagNode_t * node, char *ebuf);
int rf_Degraded_100_EOFunc(RF_DagNode_t * node);
void
rf_e_EncOneSect(RF_RowCol_t srcLogicCol, char *srcSecbuf,
RF_RowCol_t destLogicCol, char *destSecbuf, int bytesPerSector);
void
rf_e_encToBuf(RF_Raid_t * raidPtr, RF_RowCol_t srcLogicCol,
char *srcbuf, RF_RowCol_t destLogicCol, char *destbuf, int numSector);
int rf_RecoveryEFunc(RF_DagNode_t * node);
int rf_EO_DegradedWriteEFunc(RF_DagNode_t * node);
void
rf_doubleEOdecode(RF_Raid_t * raidPtr, char **rrdbuf, char **dest,
RF_RowCol_t * fcol, char *pbuf, char *ebuf);
int rf_EvenOddDoubleRecoveryFunc(RF_DagNode_t * node);
int rf_EOWriteDoubleRecoveryFunc(RF_DagNode_t * node);
#define rf_EUCol(_layoutPtr_, _addr_ ) \
( (_addr_)%( (_layoutPtr_)->dataSectorsPerStripe ) )/((_layoutPtr_)->sectorsPerStripeUnit)
#define rf_EO_Mod( _int1_, _int2_ ) \
( ((_int1_) < 0)? (((_int1_)+(_int2_))%(_int2_)) : (_int1_)%(_int2_) )
#define rf_OffsetOfNextEUBoundary(_offset_, sec_per_eu) ((_offset_)/(sec_per_eu) + 1)*(sec_per_eu)
#define RF_EO_MATRIX_DIM 17
/*
* RF_EO_MATRIX_DIM should be a prime number: and "bytesPerSector" should be
* dividable by ( RF_EO_MATRIX_DIM - 1) to fully encode and utilize the space
* in a sector, this number could also be 17. Tha later case doesn't apply
* for disk array larger than 17 columns totally.
*/
#endif /* !_RF__RF_EVENODD_DAGFUNCS_H_ */
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