1 /* $NetBSD: rf_layout.h,v 1.7 2001/10/05 15:41:23 oster Exp $ */ 2 /* 3 * Copyright (c) 1995 Carnegie-Mellon University. 4 * All rights reserved. 5 * 6 * Author: Mark Holland 7 * 8 * Permission to use, copy, modify and distribute this software and 9 * its documentation is hereby granted, provided that both the copyright 10 * notice and this permission notice appear in all copies of the 11 * software, derivative works or modified versions, and any portions 12 * thereof, and that both notices appear in supporting documentation. 13 * 14 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 15 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND 16 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 17 * 18 * Carnegie Mellon requests users of this software to return to 19 * 20 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 21 * School of Computer Science 22 * Carnegie Mellon University 23 * Pittsburgh PA 15213-3890 24 * 25 * any improvements or extensions that they make and grant Carnegie the 26 * rights to redistribute these changes. 27 */ 28 29 /* rf_layout.h -- header file defining layout data structures 30 */ 31 32 #ifndef _RF__RF_LAYOUT_H_ 33 #define _RF__RF_LAYOUT_H_ 34 35 #include <dev/raidframe/raidframevar.h> 36 #include "rf_archs.h" 37 #include "rf_alloclist.h" 38 39 /* enables remapping to spare location under dist sparing */ 40 #define RF_REMAP 1 41 #define RF_DONT_REMAP 0 42 43 /* 44 * Flags values for RF_AccessStripeMapFlags_t 45 */ 46 #define RF_NO_STRIPE_LOCKS 0x0001 /* suppress stripe locks */ 47 #define RF_DISTRIBUTE_SPARE 0x0002 /* distribute spare space in archs 48 * that support it */ 49 #define RF_BD_DECLUSTERED 0x0004 /* declustering uses block designs */ 50 51 /************************************************************************* 52 * 53 * this structure forms the layout component of the main Raid 54 * structure. It describes everything needed to define and perform 55 * the mapping of logical RAID addresses <-> physical disk addresses. 56 * 57 *************************************************************************/ 58 struct RF_RaidLayout_s { 59 /* configuration parameters */ 60 RF_SectorCount_t sectorsPerStripeUnit; /* number of sectors in one 61 * stripe unit */ 62 RF_StripeCount_t SUsPerPU; /* stripe units per parity unit */ 63 RF_StripeCount_t SUsPerRU; /* stripe units per reconstruction 64 * unit */ 65 66 /* redundant-but-useful info computed from the above, used in all 67 * layouts */ 68 RF_StripeCount_t numStripe; /* total number of stripes in the 69 * array */ 70 RF_SectorCount_t dataSectorsPerStripe; 71 RF_StripeCount_t dataStripeUnitsPerDisk; 72 u_int bytesPerStripeUnit; 73 u_int dataBytesPerStripe; 74 RF_StripeCount_t numDataCol; /* number of SUs of data per stripe 75 * (name here is a la RAID4) */ 76 RF_StripeCount_t numParityCol; /* number of SUs of parity per stripe. 77 * Always 1 for now */ 78 RF_StripeCount_t numParityLogCol; /* number of SUs of parity log 79 * per stripe. Always 1 for 80 * now */ 81 RF_StripeCount_t stripeUnitsPerDisk; 82 83 RF_LayoutSW_t *map; /* ptr to struct holding mapping fns and 84 * information */ 85 void *layoutSpecificInfo; /* ptr to a structure holding 86 * layout-specific params */ 87 }; 88 /***************************************************************************************** 89 * 90 * The mapping code returns a pointer to a list of AccessStripeMap structures, which 91 * describes all the mapping information about an access. The list contains one 92 * AccessStripeMap structure per stripe touched by the access. Each element in the list 93 * contains a stripe identifier and a pointer to a list of PhysDiskAddr structuress. Each 94 * element in this latter list describes the physical location of a stripe unit accessed 95 * within the corresponding stripe. 96 * 97 ****************************************************************************************/ 98 99 #define RF_PDA_TYPE_DATA 0 100 #define RF_PDA_TYPE_PARITY 1 101 #define RF_PDA_TYPE_Q 2 102 103 struct RF_PhysDiskAddr_s { 104 RF_RowCol_t row, col; /* disk identifier */ 105 RF_SectorNum_t startSector; /* sector offset into the disk */ 106 RF_SectorCount_t numSector; /* number of sectors accessed */ 107 int type; /* used by higher levels: currently, data, 108 * parity, or q */ 109 caddr_t bufPtr; /* pointer to buffer supplying/receiving data */ 110 RF_RaidAddr_t raidAddress; /* raid address corresponding to this 111 * physical disk address */ 112 RF_PhysDiskAddr_t *next; 113 }; 114 #define RF_MAX_FAILED_PDA RF_MAXCOL 115 116 struct RF_AccessStripeMap_s { 117 RF_StripeNum_t stripeID;/* the stripe index */ 118 RF_RaidAddr_t raidAddress; /* the starting raid address within 119 * this stripe */ 120 RF_RaidAddr_t endRaidAddress; /* raid address one sector past the 121 * end of the access */ 122 RF_SectorCount_t totalSectorsAccessed; /* total num sectors 123 * identified in physInfo list */ 124 RF_StripeCount_t numStripeUnitsAccessed; /* total num elements in 125 * physInfo list */ 126 int numDataFailed; /* number of failed data disks accessed */ 127 int numParityFailed;/* number of failed parity disks accessed (0 128 * or 1) */ 129 int numQFailed; /* number of failed Q units accessed (0 or 1) */ 130 RF_AccessStripeMapFlags_t flags; /* various flags */ 131 int numFailedPDAs; /* number of failed phys addrs */ 132 RF_PhysDiskAddr_t *failedPDAs[RF_MAX_FAILED_PDA]; /* array of failed phys 133 * addrs */ 134 RF_PhysDiskAddr_t *physInfo; /* a list of PhysDiskAddr structs */ 135 RF_PhysDiskAddr_t *parityInfo; /* list of physical addrs for the 136 * parity (P of P + Q ) */ 137 RF_PhysDiskAddr_t *qInfo; /* list of physical addrs for the Q of 138 * P + Q */ 139 RF_LockReqDesc_t lockReqDesc; /* used for stripe locking */ 140 RF_RowCol_t origRow; /* the original row: we may redirect the acc 141 * to a different row */ 142 RF_AccessStripeMap_t *next; 143 }; 144 /* flag values */ 145 #define RF_ASM_REDIR_LARGE_WRITE 0x00000001 /* allows large-write creation 146 * code to redirect failed 147 * accs */ 148 #define RF_ASM_BAILOUT_DAG_USED 0x00000002 /* allows us to detect 149 * recursive calls to the 150 * bailout write dag */ 151 #define RF_ASM_FLAGS_LOCK_TRIED 0x00000004 /* we've acquired the lock on 152 * the first parity range in 153 * this parity stripe */ 154 #define RF_ASM_FLAGS_LOCK_TRIED2 0x00000008 /* we've acquired the lock on 155 * the 2nd parity range in 156 * this parity stripe */ 157 #define RF_ASM_FLAGS_FORCE_TRIED 0x00000010 /* we've done the force-recon 158 * call on this parity stripe */ 159 #define RF_ASM_FLAGS_RECON_BLOCKED 0x00000020 /* we blocked recon => we must 160 * unblock it later */ 161 162 struct RF_AccessStripeMapHeader_s { 163 RF_StripeCount_t numStripes; /* total number of stripes touched by 164 * this acc */ 165 RF_AccessStripeMap_t *stripeMap; /* pointer to the actual map. 166 * Also used for making lists */ 167 RF_AccessStripeMapHeader_t *next; 168 }; 169 /***************************************************************************************** 170 * 171 * various routines mapping addresses in the RAID address space. These work across 172 * all layouts. DON'T PUT ANY LAYOUT-SPECIFIC CODE HERE. 173 * 174 ****************************************************************************************/ 175 176 /* return the identifier of the stripe containing the given address */ 177 #define rf_RaidAddressToStripeID(_layoutPtr_, _addr_) \ 178 ( ((_addr_) / (_layoutPtr_)->sectorsPerStripeUnit) / (_layoutPtr_)->numDataCol ) 179 180 /* return the raid address of the start of the indicates stripe ID */ 181 #define rf_StripeIDToRaidAddress(_layoutPtr_, _sid_) \ 182 ( ((_sid_) * (_layoutPtr_)->sectorsPerStripeUnit) * (_layoutPtr_)->numDataCol ) 183 184 /* return the identifier of the stripe containing the given stripe unit id */ 185 #define rf_StripeUnitIDToStripeID(_layoutPtr_, _addr_) \ 186 ( (_addr_) / (_layoutPtr_)->numDataCol ) 187 188 /* return the identifier of the stripe unit containing the given address */ 189 #define rf_RaidAddressToStripeUnitID(_layoutPtr_, _addr_) \ 190 ( ((_addr_) / (_layoutPtr_)->sectorsPerStripeUnit) ) 191 192 /* return the RAID address of next stripe boundary beyond the given address */ 193 #define rf_RaidAddressOfNextStripeBoundary(_layoutPtr_, _addr_) \ 194 ( (((_addr_)/(_layoutPtr_)->dataSectorsPerStripe)+1) * (_layoutPtr_)->dataSectorsPerStripe ) 195 196 /* return the RAID address of the start of the stripe containing the given address */ 197 #define rf_RaidAddressOfPrevStripeBoundary(_layoutPtr_, _addr_) \ 198 ( (((_addr_)/(_layoutPtr_)->dataSectorsPerStripe)+0) * (_layoutPtr_)->dataSectorsPerStripe ) 199 200 /* return the RAID address of next stripe unit boundary beyond the given address */ 201 #define rf_RaidAddressOfNextStripeUnitBoundary(_layoutPtr_, _addr_) \ 202 ( (((_addr_)/(_layoutPtr_)->sectorsPerStripeUnit)+1L)*(_layoutPtr_)->sectorsPerStripeUnit ) 203 204 /* return the RAID address of the start of the stripe unit containing RAID address _addr_ */ 205 #define rf_RaidAddressOfPrevStripeUnitBoundary(_layoutPtr_, _addr_) \ 206 ( (((_addr_)/(_layoutPtr_)->sectorsPerStripeUnit)+0)*(_layoutPtr_)->sectorsPerStripeUnit ) 207 208 /* returns the offset into the stripe. used by RaidAddressStripeAligned */ 209 #define rf_RaidAddressStripeOffset(_layoutPtr_, _addr_) \ 210 ( (_addr_) % ((_layoutPtr_)->dataSectorsPerStripe) ) 211 212 /* returns the offset into the stripe unit. */ 213 #define rf_StripeUnitOffset(_layoutPtr_, _addr_) \ 214 ( (_addr_) % ((_layoutPtr_)->sectorsPerStripeUnit) ) 215 216 /* returns nonzero if the given RAID address is stripe-aligned */ 217 #define rf_RaidAddressStripeAligned( __layoutPtr__, __addr__ ) \ 218 ( rf_RaidAddressStripeOffset(__layoutPtr__, __addr__) == 0 ) 219 220 /* returns nonzero if the given address is stripe-unit aligned */ 221 #define rf_StripeUnitAligned( __layoutPtr__, __addr__ ) \ 222 ( rf_StripeUnitOffset(__layoutPtr__, __addr__) == 0 ) 223 224 /* convert an address expressed in RAID blocks to/from an addr expressed in bytes */ 225 #define rf_RaidAddressToByte(_raidPtr_, _addr_) \ 226 ( (_addr_) << ( (_raidPtr_)->logBytesPerSector ) ) 227 228 #define rf_ByteToRaidAddress(_raidPtr_, _addr_) \ 229 ( (_addr_) >> ( (_raidPtr_)->logBytesPerSector ) ) 230 231 /* convert a raid address to/from a parity stripe ID. Conversion to raid address is easy, 232 * since we're asking for the address of the first sector in the parity stripe. Conversion to a 233 * parity stripe ID is more complex, since stripes are not contiguously allocated in 234 * parity stripes. 235 */ 236 #define rf_RaidAddressToParityStripeID(_layoutPtr_, _addr_, _ru_num_) \ 237 rf_MapStripeIDToParityStripeID( (_layoutPtr_), rf_RaidAddressToStripeID( (_layoutPtr_), (_addr_) ), (_ru_num_) ) 238 239 #define rf_ParityStripeIDToRaidAddress(_layoutPtr_, _psid_) \ 240 ( (_psid_) * (_layoutPtr_)->SUsPerPU * (_layoutPtr_)->numDataCol * (_layoutPtr_)->sectorsPerStripeUnit ) 241 242 RF_LayoutSW_t *rf_GetLayout(RF_ParityConfig_t parityConfig); 243 int 244 rf_ConfigureLayout(RF_ShutdownList_t ** listp, RF_Raid_t * raidPtr, 245 RF_Config_t * cfgPtr); 246 RF_StripeNum_t 247 rf_MapStripeIDToParityStripeID(RF_RaidLayout_t * layoutPtr, 248 RF_StripeNum_t stripeID, RF_ReconUnitNum_t * which_ru); 249 250 #endif /* !_RF__RF_LAYOUT_H_ */ 251