rf_layout.h revision 1.8
1 /* $NetBSD: rf_layout.h,v 1.8 2002/09/23 02:35:24 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 (at) 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 RF_StripeCount_t numDataCol; /* number of SUs of data per stripe 74 * (name here is a la RAID4) */ 75 RF_StripeCount_t numParityCol; /* number of SUs of parity per stripe. 76 * Always 1 for now */ 77 RF_StripeCount_t numParityLogCol; /* number of SUs of parity log 78 * per stripe. Always 1 for 79 * now */ 80 RF_StripeCount_t stripeUnitsPerDisk; 81 82 RF_LayoutSW_t *map; /* ptr to struct holding mapping fns and 83 * information */ 84 void *layoutSpecificInfo; /* ptr to a structure holding 85 * layout-specific params */ 86 }; 87 /***************************************************************************************** 88 * 89 * The mapping code returns a pointer to a list of AccessStripeMap structures, which 90 * describes all the mapping information about an access. The list contains one 91 * AccessStripeMap structure per stripe touched by the access. Each element in the list 92 * contains a stripe identifier and a pointer to a list of PhysDiskAddr structuress. Each 93 * element in this latter list describes the physical location of a stripe unit accessed 94 * within the corresponding stripe. 95 * 96 ****************************************************************************************/ 97 98 #define RF_PDA_TYPE_DATA 0 99 #define RF_PDA_TYPE_PARITY 1 100 #define RF_PDA_TYPE_Q 2 101 102 struct RF_PhysDiskAddr_s { 103 RF_RowCol_t row, col; /* disk identifier */ 104 RF_SectorNum_t startSector; /* sector offset into the disk */ 105 RF_SectorCount_t numSector; /* number of sectors accessed */ 106 int type; /* used by higher levels: currently, data, 107 * parity, or q */ 108 caddr_t bufPtr; /* pointer to buffer supplying/receiving data */ 109 RF_RaidAddr_t raidAddress; /* raid address corresponding to this 110 * physical disk address */ 111 RF_PhysDiskAddr_t *next; 112 }; 113 #define RF_MAX_FAILED_PDA RF_MAXCOL 114 115 struct RF_AccessStripeMap_s { 116 RF_StripeNum_t stripeID;/* the stripe index */ 117 RF_RaidAddr_t raidAddress; /* the starting raid address within 118 * this stripe */ 119 RF_RaidAddr_t endRaidAddress; /* raid address one sector past the 120 * end of the access */ 121 RF_SectorCount_t totalSectorsAccessed; /* total num sectors 122 * identified in physInfo list */ 123 RF_StripeCount_t numStripeUnitsAccessed; /* total num elements in 124 * physInfo list */ 125 int numDataFailed; /* number of failed data disks accessed */ 126 int numParityFailed;/* number of failed parity disks accessed (0 127 * or 1) */ 128 int numQFailed; /* number of failed Q units accessed (0 or 1) */ 129 RF_AccessStripeMapFlags_t flags; /* various flags */ 130 int numFailedPDAs; /* number of failed phys addrs */ 131 RF_PhysDiskAddr_t *failedPDAs[RF_MAX_FAILED_PDA]; /* array of failed phys 132 * addrs */ 133 RF_PhysDiskAddr_t *physInfo; /* a list of PhysDiskAddr structs */ 134 RF_PhysDiskAddr_t *parityInfo; /* list of physical addrs for the 135 * parity (P of P + Q ) */ 136 RF_PhysDiskAddr_t *qInfo; /* list of physical addrs for the Q of 137 * P + Q */ 138 RF_LockReqDesc_t lockReqDesc; /* used for stripe locking */ 139 RF_RowCol_t origRow; /* the original row: we may redirect the acc 140 * to a different row */ 141 RF_AccessStripeMap_t *next; 142 }; 143 /* flag values */ 144 #define RF_ASM_REDIR_LARGE_WRITE 0x00000001 /* allows large-write creation 145 * code to redirect failed 146 * accs */ 147 #define RF_ASM_BAILOUT_DAG_USED 0x00000002 /* allows us to detect 148 * recursive calls to the 149 * bailout write dag */ 150 #define RF_ASM_FLAGS_LOCK_TRIED 0x00000004 /* we've acquired the lock on 151 * the first parity range in 152 * this parity stripe */ 153 #define RF_ASM_FLAGS_LOCK_TRIED2 0x00000008 /* we've acquired the lock on 154 * the 2nd parity range in 155 * this parity stripe */ 156 #define RF_ASM_FLAGS_FORCE_TRIED 0x00000010 /* we've done the force-recon 157 * call on this parity stripe */ 158 #define RF_ASM_FLAGS_RECON_BLOCKED 0x00000020 /* we blocked recon => we must 159 * unblock it later */ 160 161 struct RF_AccessStripeMapHeader_s { 162 RF_StripeCount_t numStripes; /* total number of stripes touched by 163 * this acc */ 164 RF_AccessStripeMap_t *stripeMap; /* pointer to the actual map. 165 * Also used for making lists */ 166 RF_AccessStripeMapHeader_t *next; 167 }; 168 /***************************************************************************************** 169 * 170 * various routines mapping addresses in the RAID address space. These work across 171 * all layouts. DON'T PUT ANY LAYOUT-SPECIFIC CODE HERE. 172 * 173 ****************************************************************************************/ 174 175 /* return the identifier of the stripe containing the given address */ 176 #define rf_RaidAddressToStripeID(_layoutPtr_, _addr_) \ 177 ( ((_addr_) / (_layoutPtr_)->sectorsPerStripeUnit) / (_layoutPtr_)->numDataCol ) 178 179 /* return the raid address of the start of the indicates stripe ID */ 180 #define rf_StripeIDToRaidAddress(_layoutPtr_, _sid_) \ 181 ( ((_sid_) * (_layoutPtr_)->sectorsPerStripeUnit) * (_layoutPtr_)->numDataCol ) 182 183 /* return the identifier of the stripe containing the given stripe unit id */ 184 #define rf_StripeUnitIDToStripeID(_layoutPtr_, _addr_) \ 185 ( (_addr_) / (_layoutPtr_)->numDataCol ) 186 187 /* return the identifier of the stripe unit containing the given address */ 188 #define rf_RaidAddressToStripeUnitID(_layoutPtr_, _addr_) \ 189 ( ((_addr_) / (_layoutPtr_)->sectorsPerStripeUnit) ) 190 191 /* return the RAID address of next stripe boundary beyond the given address */ 192 #define rf_RaidAddressOfNextStripeBoundary(_layoutPtr_, _addr_) \ 193 ( (((_addr_)/(_layoutPtr_)->dataSectorsPerStripe)+1) * (_layoutPtr_)->dataSectorsPerStripe ) 194 195 /* return the RAID address of the start of the stripe containing the given address */ 196 #define rf_RaidAddressOfPrevStripeBoundary(_layoutPtr_, _addr_) \ 197 ( (((_addr_)/(_layoutPtr_)->dataSectorsPerStripe)+0) * (_layoutPtr_)->dataSectorsPerStripe ) 198 199 /* return the RAID address of next stripe unit boundary beyond the given address */ 200 #define rf_RaidAddressOfNextStripeUnitBoundary(_layoutPtr_, _addr_) \ 201 ( (((_addr_)/(_layoutPtr_)->sectorsPerStripeUnit)+1L)*(_layoutPtr_)->sectorsPerStripeUnit ) 202 203 /* return the RAID address of the start of the stripe unit containing RAID address _addr_ */ 204 #define rf_RaidAddressOfPrevStripeUnitBoundary(_layoutPtr_, _addr_) \ 205 ( (((_addr_)/(_layoutPtr_)->sectorsPerStripeUnit)+0)*(_layoutPtr_)->sectorsPerStripeUnit ) 206 207 /* returns the offset into the stripe. used by RaidAddressStripeAligned */ 208 #define rf_RaidAddressStripeOffset(_layoutPtr_, _addr_) \ 209 ( (_addr_) % ((_layoutPtr_)->dataSectorsPerStripe) ) 210 211 /* returns the offset into the stripe unit. */ 212 #define rf_StripeUnitOffset(_layoutPtr_, _addr_) \ 213 ( (_addr_) % ((_layoutPtr_)->sectorsPerStripeUnit) ) 214 215 /* returns nonzero if the given RAID address is stripe-aligned */ 216 #define rf_RaidAddressStripeAligned( __layoutPtr__, __addr__ ) \ 217 ( rf_RaidAddressStripeOffset(__layoutPtr__, __addr__) == 0 ) 218 219 /* returns nonzero if the given address is stripe-unit aligned */ 220 #define rf_StripeUnitAligned( __layoutPtr__, __addr__ ) \ 221 ( rf_StripeUnitOffset(__layoutPtr__, __addr__) == 0 ) 222 223 /* convert an address expressed in RAID blocks to/from an addr expressed in bytes */ 224 #define rf_RaidAddressToByte(_raidPtr_, _addr_) \ 225 ( (_addr_) << ( (_raidPtr_)->logBytesPerSector ) ) 226 227 #define rf_ByteToRaidAddress(_raidPtr_, _addr_) \ 228 ( (_addr_) >> ( (_raidPtr_)->logBytesPerSector ) ) 229 230 /* convert a raid address to/from a parity stripe ID. Conversion to raid address is easy, 231 * since we're asking for the address of the first sector in the parity stripe. Conversion to a 232 * parity stripe ID is more complex, since stripes are not contiguously allocated in 233 * parity stripes. 234 */ 235 #define rf_RaidAddressToParityStripeID(_layoutPtr_, _addr_, _ru_num_) \ 236 rf_MapStripeIDToParityStripeID( (_layoutPtr_), rf_RaidAddressToStripeID( (_layoutPtr_), (_addr_) ), (_ru_num_) ) 237 238 #define rf_ParityStripeIDToRaidAddress(_layoutPtr_, _psid_) \ 239 ( (_psid_) * (_layoutPtr_)->SUsPerPU * (_layoutPtr_)->numDataCol * (_layoutPtr_)->sectorsPerStripeUnit ) 240 241 RF_LayoutSW_t *rf_GetLayout(RF_ParityConfig_t parityConfig); 242 int 243 rf_ConfigureLayout(RF_ShutdownList_t ** listp, RF_Raid_t * raidPtr, 244 RF_Config_t * cfgPtr); 245 RF_StripeNum_t 246 rf_MapStripeIDToParityStripeID(RF_RaidLayout_t * layoutPtr, 247 RF_StripeNum_t stripeID, RF_ReconUnitNum_t * which_ru); 248 249 #endif /* !_RF__RF_LAYOUT_H_ */ 250
Indexes created Tue Sep 30 11:09:46 GMT 2025