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Annotation of sys/dev/raidframe/rf_evenodd_dagfuncs.h, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: rf_evenodd_dagfuncs.h,v 1.3 2002/12/16 07:01:04 tdeval Exp $  */
                      2: /*     $NetBSD: rf_evenodd_dagfuncs.h,v 1.2 1999/02/05 00:06:11 oster Exp $    */
                      3:
                      4: /*
                      5:  * rf_evenodd_dagfuncs.h
                      6:  */
                      7: /*
                      8:  * Copyright (c) 1996 Carnegie-Mellon University.
                      9:  * All rights reserved.
                     10:  *
                     11:  * Author: Chang-Ming Wu
                     12:  *
                     13:  * Permission to use, copy, modify and distribute this software and
                     14:  * its documentation is hereby granted, provided that both the copyright
                     15:  * notice and this permission notice appear in all copies of the
                     16:  * software, derivative works or modified versions, and any portions
                     17:  * thereof, and that both notices appear in supporting documentation.
                     18:  *
                     19:  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
                     20:  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
                     21:  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
                     22:  *
                     23:  * Carnegie Mellon requests users of this software to return to
                     24:  *
                     25:  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
                     26:  *  School of Computer Science
                     27:  *  Carnegie Mellon University
                     28:  *  Pittsburgh PA 15213-3890
                     29:  *
                     30:  * any improvements or extensions that they make and grant Carnegie the
                     31:  * rights to redistribute these changes.
                     32:  */
                     33:
                     34: #ifndef        _RF__RF_EVENODD_DAGFUNCS_H_
                     35: #define        _RF__RF_EVENODD_DAGFUNCS_H_
                     36:
                     37: extern RF_RedFuncs_t rf_EOSmallWriteEFuncs;
                     38: extern RF_RedFuncs_t rf_EOSmallWritePFuncs;
                     39: extern RF_RedFuncs_t rf_eoERecoveryFuncs;
                     40: extern RF_RedFuncs_t rf_eoPRecoveryFuncs;
                     41: extern RF_RedFuncs_t rf_eoERecoveryFuncs;
                     42:
                     43: int  rf_RegularPEFunc(RF_DagNode_t *);
                     44: int  rf_RegularONEFunc(RF_DagNode_t *);
                     45: int  rf_SimpleONEFunc(RF_DagNode_t *);
                     46: void rf_RegularESubroutine(RF_DagNode_t *, char *);
                     47: int  rf_RegularEFunc(RF_DagNode_t *);
                     48: void rf_DegrESubroutine(RF_DagNode_t *, char *);
                     49: int  rf_Degraded_100_EOFunc(RF_DagNode_t *);
                     50: void rf_e_EncOneSect(RF_RowCol_t, char *, RF_RowCol_t, char *, int);
                     51: void rf_e_encToBuf(RF_Raid_t *, RF_RowCol_t, char *, RF_RowCol_t, char *, int);
                     52: int  rf_RecoveryEFunc(RF_DagNode_t *);
                     53: int  rf_EO_DegradedWriteEFunc(RF_DagNode_t *);
                     54: void rf_doubleEOdecode(RF_Raid_t *, char **, char **, RF_RowCol_t *,
                     55:        char *, char *);
                     56: int  rf_EvenOddDoubleRecoveryFunc(RF_DagNode_t *);
                     57: int  rf_EOWriteDoubleRecoveryFunc(RF_DagNode_t *);
                     58:
                     59: #define        rf_EUCol(_layoutPtr_,_addr_)                                    \
                     60:        ((_addr_) % ((_layoutPtr_)->dataSectorsPerStripe)) /            \
                     61:        ((_layoutPtr_)->sectorsPerStripeUnit)
                     62:
                     63: #define        rf_EO_Mod(_int1_,_int2_)                                        \
                     64:        (((_int1_) < 0) ? (((_int1_) + (_int2_)) % (_int2_))            \
                     65:                        : ((_int1_) % (_int2_)))
                     66:
                     67: #define        rf_OffsetOfNextEUBoundary(_offset_, sec_per_eu)                 \
                     68:        ((_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:  * divisible by (RF_EO_MATRIX_DIM - 1) to fully encode and utilize the space
                     75:  * in a sector, this number could also be 17. That later case doesn't apply
                     76:  * for disk array larger than 17 columns totally.
                     77:  */
                     78:
                     79: #endif /* !_RF__RF_EVENODD_DAGFUNCS_H_ */