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      1 /*	$NetBSD: rf_evenodd_dagfuncs.h,v 1.7 2024/02/09 22:08:36 andvar Exp $	*/
      2 /*
      3  * rf_evenodd_dagfuncs.h
      4  */
      5 /*
      6  * Copyright (c) 1996 Carnegie-Mellon University.
      7  * All rights reserved.
      8  *
      9  * Author: Chang-Ming Wu
     10  *
     11  * Permission to use, copy, modify and distribute this software and
     12  * its documentation is hereby granted, provided that both the copyright
     13  * notice and this permission notice appear in all copies of the
     14  * software, derivative works or modified versions, and any portions
     15  * thereof, and that both notices appear in supporting documentation.
     16  *
     17  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     18  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
     19  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     20  *
     21  * Carnegie Mellon requests users of this software to return to
     22  *
     23  *  Software Distribution Coordinator  or  Software.Distribution (at) CS.CMU.EDU
     24  *  School of Computer Science
     25  *  Carnegie Mellon University
     26  *  Pittsburgh PA 15213-3890
     27  *
     28  * any improvements or extensions that they make and grant Carnegie the
     29  * rights to redistribute these changes.
     30  */
     31 
     32 #ifndef _RF__RF_EVENODD_DAGFUNCS_H_
     33 #define _RF__RF_EVENODD_DAGFUNCS_H_
     34 
     35 extern RF_RedFuncs_t rf_EOSmallWriteEFuncs;
     36 extern RF_RedFuncs_t rf_EOSmallWritePFuncs;
     37 extern RF_RedFuncs_t rf_eoERecoveryFuncs;
     38 extern RF_RedFuncs_t rf_eoPRecoveryFuncs;
     39 extern RF_RedFuncs_t rf_eoERecoveryFuncs;
     40 
     41 void    rf_RegularPEFunc(RF_DagNode_t * node);
     42 void    rf_RegularONEFunc(RF_DagNode_t * node);
     43 void    rf_SimpleONEFunc(RF_DagNode_t * node);
     44 void    rf_RegularESubroutine(RF_DagNode_t * node, char *ebuf);
     45 void    rf_RegularEFunc(RF_DagNode_t * node);
     46 void    rf_DegrESubroutine(RF_DagNode_t * node, char *ebuf);
     47 void    rf_Degraded_100_EOFunc(RF_DagNode_t * node);
     48 void
     49 rf_e_EncOneSect(RF_RowCol_t srcLogicCol, char *srcSecbuf,
     50     RF_RowCol_t destLogicCol, char *destSecbuf, int bytesPerSector);
     51 void
     52 rf_e_encToBuf(RF_Raid_t * raidPtr, RF_RowCol_t srcLogicCol,
     53     char *srcbuf, RF_RowCol_t destLogicCol, char *destbuf, int numSector);
     54 void    rf_RecoveryEFunc(RF_DagNode_t * node);
     55 void    rf_EO_DegradedWriteEFunc(RF_DagNode_t * node);
     56 void
     57 rf_doubleEOdecode(RF_Raid_t * raidPtr, char **rrdbuf, char **dest,
     58     RF_RowCol_t * fcol, char *pbuf, char *ebuf);
     59 void    rf_EvenOddDoubleRecoveryFunc(RF_DagNode_t * node);
     60 void    rf_EOWriteDoubleRecoveryFunc(RF_DagNode_t * node);
     61 
     62 #define rf_EUCol(_layoutPtr_, _addr_ ) \
     63 ( (_addr_)%( (_layoutPtr_)->dataSectorsPerStripe ) )/((_layoutPtr_)->sectorsPerStripeUnit)
     64 
     65 #define rf_EO_Mod( _int1_, _int2_ ) \
     66 ( ((_int1_) < 0)? (((_int1_)+(_int2_))%(_int2_)) : (_int1_)%(_int2_) )
     67 
     68 #define rf_OffsetOfNextEUBoundary(_offset_, sec_per_eu) ((_offset_)/(sec_per_eu) + 1)*(sec_per_eu)
     69 
     70 #define RF_EO_MATRIX_DIM 17
     71 
     72 /*
     73  * RF_EO_MATRIX_DIM should be a prime number: and "bytesPerSector" should be
     74  * dividable by ( RF_EO_MATRIX_DIM - 1) to fully encode and use the space
     75  * in a sector, this number could also be 17. The later case doesn't apply
     76  * for disk array larger than 17 columns totally.
     77  */
     78 
     79 #endif				/* !_RF__RF_EVENODD_DAGFUNCS_H_ */
     80