Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/dev/raidframe/rf_evenodd_dagfuncs.h
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1 /* $NetBSD: rf_evenodd_dagfuncs.h,v 1.3 2003/02/05 00:02:38 perry 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@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 int rf_RegularPEFunc(RF_DagNode_t * node); 42 int rf_RegularONEFunc(RF_DagNode_t * node); 43 int rf_SimpleONEFunc(RF_DagNode_t * node); 44 void rf_RegularESubroutine(RF_DagNode_t * node, char *ebuf); 45 int rf_RegularEFunc(RF_DagNode_t * node); 46 void rf_DegrESubroutine(RF_DagNode_t * node, char *ebuf); 47 int 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 int rf_RecoveryEFunc(RF_DagNode_t * node); 55 int 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 int rf_EvenOddDoubleRecoveryFunc(RF_DagNode_t * node); 60 int 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. Tha later case doesn't apply 76 * for disk array larger than 17 columns totally. 77 */ 78 79 #endif /* !_RF__RF_EVENODD_DAGFUNCS_H_ */
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