rf_layout.h revision 1.1
1 /* $NetBSD: rf_layout.h,v 1.1 1998/11/13 04:20:30 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 /* 33 * : 34 * Log: rf_layout.h,v 35 * Revision 1.50 1996/11/05 21:10:40 jimz 36 * failed pda generalization 37 * 38 * Revision 1.49 1996/07/29 14:05:12 jimz 39 * fix numPUs/numRUs confusion (everything is now numRUs) 40 * clean up some commenting, return values 41 * 42 * Revision 1.48 1996/07/22 19:52:16 jimz 43 * switched node params to RF_DagParam_t, a union of 44 * a 64-bit int and a void *, for better portability 45 * attempted hpux port, but failed partway through for 46 * lack of a single C compiler capable of compiling all 47 * source files 48 * 49 * Revision 1.47 1996/07/18 22:57:14 jimz 50 * port simulator to AIX 51 * 52 * Revision 1.46 1996/07/13 00:00:59 jimz 53 * sanitized generalized reconstruction architecture 54 * cleaned up head sep, rbuf problems 55 * 56 * Revision 1.45 1996/07/11 19:08:00 jimz 57 * generalize reconstruction mechanism 58 * allow raid1 reconstructs via copyback (done with array 59 * quiesced, not online, therefore not disk-directed) 60 * 61 * Revision 1.44 1996/06/19 22:23:01 jimz 62 * parity verification is now a layout-configurable thing 63 * not all layouts currently support it (correctly, anyway) 64 * 65 * Revision 1.43 1996/06/19 17:53:48 jimz 66 * move GetNumSparePUs, InstallSpareTable ops into layout switch 67 * 68 * Revision 1.42 1996/06/19 14:56:48 jimz 69 * move layout-specific config parsing hooks into RF_LayoutSW_t 70 * table in rf_layout.c 71 * 72 * Revision 1.41 1996/06/10 11:55:47 jimz 73 * Straightened out some per-array/not-per-array distinctions, fixed 74 * a couple bugs related to confusion. Added shutdown lists. Removed 75 * layout shutdown function (now subsumed by shutdown lists). 76 * 77 * Revision 1.40 1996/06/07 22:26:27 jimz 78 * type-ify which_ru (RF_ReconUnitNum_t) 79 * 80 * Revision 1.39 1996/06/07 21:33:04 jimz 81 * begin using consistent types for sector numbers, 82 * stripe numbers, row+col numbers, recon unit numbers 83 * 84 * Revision 1.38 1996/06/03 23:28:26 jimz 85 * more bugfixes 86 * check in tree to sync for IPDS runs with current bugfixes 87 * there still may be a problem with threads in the script test 88 * getting I/Os stuck- not trivially reproducible (runs ~50 times 89 * in a row without getting stuck) 90 * 91 * Revision 1.37 1996/05/31 22:26:54 jimz 92 * fix a lot of mapping problems, memory allocation problems 93 * found some weird lock issues, fixed 'em 94 * more code cleanup 95 * 96 * Revision 1.36 1996/05/30 11:29:41 jimz 97 * Numerous bug fixes. Stripe lock release code disagreed with the taking code 98 * about when stripes should be locked (I made it consistent: no parity, no lock) 99 * There was a lot of extra serialization of I/Os which I've removed- a lot of 100 * it was to calculate values for the cache code, which is no longer with us. 101 * More types, function, macro cleanup. Added code to properly quiesce the array 102 * on shutdown. Made a lot of stuff array-specific which was (bogusly) general 103 * before. Fixed memory allocation, freeing bugs. 104 * 105 * Revision 1.35 1996/05/27 18:56:37 jimz 106 * more code cleanup 107 * better typing 108 * compiles in all 3 environments 109 * 110 * Revision 1.34 1996/05/24 22:17:04 jimz 111 * continue code + namespace cleanup 112 * typed a bunch of flags 113 * 114 * Revision 1.33 1996/05/24 04:28:55 jimz 115 * release cleanup ckpt 116 * 117 * Revision 1.32 1996/05/24 01:59:45 jimz 118 * another checkpoint in code cleanup for release 119 * time to sync kernel tree 120 * 121 * Revision 1.31 1996/05/23 21:46:35 jimz 122 * checkpoint in code cleanup (release prep) 123 * lots of types, function names have been fixed 124 * 125 * Revision 1.30 1996/05/18 19:51:34 jimz 126 * major code cleanup- fix syntax, make some types consistent, 127 * add prototypes, clean out dead code, et cetera 128 * 129 * Revision 1.29 1995/12/01 19:16:19 root 130 * added copyright info 131 * 132 * Revision 1.28 1995/11/28 21:26:49 amiri 133 * defined a declustering flag RF_BD_DECLUSTERED 134 * 135 * Revision 1.27 1995/11/17 19:00:59 wvcii 136 * created MapQ entry in switch table 137 * added prototyping to MapParity 138 * 139 * Revision 1.26 1995/11/07 15:40:27 wvcii 140 * changed prototype of SeclectionFunc in mapsw 141 * function no longer returns numHdrSucc, numTermAnt 142 * 143 * Revision 1.25 1995/10/12 20:57:08 arw 144 * added lots of comments 145 * 146 * Revision 1.24 1995/10/12 16:04:08 jimz 147 * added config name to mapsw 148 * 149 * Revision 1.23 1995/07/26 03:28:31 robby 150 * intermediary checkin 151 * 152 * Revision 1.22 1995/07/10 20:51:08 robby 153 * added to the asm info for the virtual striping locks 154 * 155 * Revision 1.21 1995/07/10 16:57:47 robby 156 * updated alloclistelem struct to the correct struct name 157 * 158 * Revision 1.20 1995/07/08 20:06:11 rachad 159 * *** empty log message *** 160 * 161 * Revision 1.19 1995/07/08 18:05:39 rachad 162 * Linked up Claudsons code with the real cache 163 * 164 * Revision 1.18 1995/07/06 14:29:36 robby 165 * added defaults states list to the layout switch 166 * 167 * Revision 1.17 1995/06/23 13:40:14 robby 168 * updeated to prototypes in rf_layout.h 169 * 170 * Revision 1.16 1995/06/08 22:11:03 holland 171 * bug fixes related to mutiple-row arrays 172 * 173 * Revision 1.15 1995/05/24 21:43:23 wvcii 174 * added field numParityLogCol to RaidLayout 175 * 176 * Revision 1.14 95/05/02 22:46:53 holland 177 * minor code cleanups. 178 * 179 * Revision 1.13 1995/05/02 12:48:01 holland 180 * eliminated some unused code. 181 * 182 * Revision 1.12 1995/05/01 13:28:00 holland 183 * parity range locks, locking disk requests, recon+parityscan in kernel, etc. 184 * 185 * Revision 1.11 1995/03/15 20:01:17 holland 186 * added REMAP and DONT_REMAP 187 * 188 * Revision 1.10 1995/03/09 19:54:11 rachad 189 * Added suport for threadless simulator 190 * 191 * Revision 1.9 1995/03/03 21:48:58 holland 192 * minor changes. 193 * 194 * Revision 1.8 1995/03/01 20:25:48 holland 195 * kernelization changes 196 * 197 * Revision 1.7 1995/02/03 22:31:36 holland 198 * many changes related to kernelization 199 * 200 * Revision 1.6 1995/01/30 14:53:46 holland 201 * extensive changes related to making DoIO non-blocking 202 * 203 * Revision 1.5 1995/01/24 23:58:46 holland 204 * multi-way recon XOR, plus various small changes 205 * 206 * Revision 1.4 1995/01/04 19:28:35 holland 207 * corrected comments around mapsw 208 * 209 * Revision 1.3 1994/11/28 22:15:45 danner 210 * Added type field to the physdiskaddr struct. 211 * 212 */ 213 214 #ifndef _RF__RF_LAYOUT_H_ 215 #define _RF__RF_LAYOUT_H_ 216 217 #include "rf_types.h" 218 #include "rf_archs.h" 219 #include "rf_alloclist.h" 220 221 /***************************************************************************************** 222 * 223 * This structure identifies all layout-specific operations and parameters. 224 * 225 ****************************************************************************************/ 226 227 typedef struct RF_LayoutSW_s { 228 RF_ParityConfig_t parityConfig; 229 char *configName; 230 231 #ifndef KERNEL 232 /* layout-specific parsing */ 233 int (*MakeLayoutSpecific)(FILE *fp, RF_Config_t *cfgPtr, void *arg); 234 void *makeLayoutSpecificArg; 235 #endif /* !KERNEL */ 236 237 #if RF_UTILITY == 0 238 /* initialization routine */ 239 int (*Configure)(RF_ShutdownList_t **shutdownListp, RF_Raid_t *raidPtr, RF_Config_t *cfgPtr); 240 241 /* routine to map RAID sector address -> physical (row, col, offset) */ 242 void (*MapSector)(RF_Raid_t *raidPtr, RF_RaidAddr_t raidSector, 243 RF_RowCol_t *row, RF_RowCol_t *col, RF_SectorNum_t *diskSector, int remap); 244 245 /* routine to map RAID sector address -> physical (r,c,o) of parity unit */ 246 void (*MapParity)(RF_Raid_t *raidPtr, RF_RaidAddr_t raidSector, 247 RF_RowCol_t *row, RF_RowCol_t *col, RF_SectorNum_t *diskSector, int remap); 248 249 /* routine to map RAID sector address -> physical (r,c,o) of Q unit */ 250 void (*MapQ)(RF_Raid_t *raidPtr, RF_RaidAddr_t raidSector, RF_RowCol_t *row, 251 RF_RowCol_t *col, RF_SectorNum_t *diskSector, int remap); 252 253 /* routine to identify the disks comprising a stripe */ 254 void (*IdentifyStripe)(RF_Raid_t *raidPtr, RF_RaidAddr_t addr, 255 RF_RowCol_t **diskids, RF_RowCol_t *outRow); 256 257 /* routine to select a dag */ 258 void (*SelectionFunc)(RF_Raid_t *raidPtr, RF_IoType_t type, 259 RF_AccessStripeMap_t *asmap, 260 RF_VoidFuncPtr *); 261 #if 0 262 void (**createFunc)(RF_Raid_t *, 263 RF_AccessStripeMap_t *, 264 RF_DagHeader_t *, void *, 265 RF_RaidAccessFlags_t, 266 RF_AllocListElem_t *)); 267 268 #endif 269 270 /* map a stripe ID to a parity stripe ID. This is typically the identity mapping */ 271 void (*MapSIDToPSID)(RF_RaidLayout_t *layoutPtr, RF_StripeNum_t stripeID, 272 RF_StripeNum_t *psID, RF_ReconUnitNum_t *which_ru); 273 274 /* get default head separation limit (may be NULL) */ 275 RF_HeadSepLimit_t (*GetDefaultHeadSepLimit)(RF_Raid_t *raidPtr); 276 277 /* get default num recon buffers (may be NULL) */ 278 int (*GetDefaultNumFloatingReconBuffers)(RF_Raid_t *raidPtr); 279 280 /* get number of spare recon units (may be NULL) */ 281 RF_ReconUnitCount_t (*GetNumSpareRUs)(RF_Raid_t *raidPtr); 282 283 /* spare table installation (may be NULL) */ 284 int (*InstallSpareTable)(RF_Raid_t *raidPtr, RF_RowCol_t frow, RF_RowCol_t fcol); 285 286 /* recon buffer submission function */ 287 int (*SubmitReconBuffer)(RF_ReconBuffer_t *rbuf, int keep_it, 288 int use_committed); 289 290 /* 291 * verify that parity information for a stripe is correct 292 * see rf_parityscan.h for return vals 293 */ 294 int (*VerifyParity)(RF_Raid_t *raidPtr, RF_RaidAddr_t raidAddr, 295 RF_PhysDiskAddr_t *parityPDA, int correct_it, RF_RaidAccessFlags_t flags); 296 297 /* number of faults tolerated by this mapping */ 298 int faultsTolerated; 299 300 /* states to step through in an access. Must end with "LastState". 301 * The default is DefaultStates in rf_layout.c */ 302 RF_AccessState_t *states; 303 304 RF_AccessStripeMapFlags_t flags; 305 #endif /* RF_UTILITY == 0 */ 306 } RF_LayoutSW_t; 307 308 /* enables remapping to spare location under dist sparing */ 309 #define RF_REMAP 1 310 #define RF_DONT_REMAP 0 311 312 /* 313 * Flags values for RF_AccessStripeMapFlags_t 314 */ 315 #define RF_NO_STRIPE_LOCKS 0x0001 /* suppress stripe locks */ 316 #define RF_DISTRIBUTE_SPARE 0x0002 /* distribute spare space in archs that support it */ 317 #define RF_BD_DECLUSTERED 0x0004 /* declustering uses block designs */ 318 319 /************************************************************************* 320 * 321 * this structure forms the layout component of the main Raid 322 * structure. It describes everything needed to define and perform 323 * the mapping of logical RAID addresses <-> physical disk addresses. 324 * 325 *************************************************************************/ 326 struct RF_RaidLayout_s { 327 /* configuration parameters */ 328 RF_SectorCount_t sectorsPerStripeUnit; /* number of sectors in one stripe unit */ 329 RF_StripeCount_t SUsPerPU; /* stripe units per parity unit */ 330 RF_StripeCount_t SUsPerRU; /* stripe units per reconstruction unit */ 331 332 /* redundant-but-useful info computed from the above, used in all layouts */ 333 RF_StripeCount_t numStripe; /* total number of stripes in the array */ 334 RF_SectorCount_t dataSectorsPerStripe; 335 RF_StripeCount_t dataStripeUnitsPerDisk; 336 u_int bytesPerStripeUnit; 337 u_int dataBytesPerStripe; 338 RF_StripeCount_t numDataCol; /* number of SUs of data per stripe (name here is a la RAID4) */ 339 RF_StripeCount_t numParityCol; /* number of SUs of parity per stripe. Always 1 for now */ 340 RF_StripeCount_t numParityLogCol; /* number of SUs of parity log per stripe. Always 1 for now */ 341 RF_StripeCount_t stripeUnitsPerDisk; 342 343 RF_LayoutSW_t *map; /* ptr to struct holding mapping fns and information */ 344 void *layoutSpecificInfo; /* ptr to a structure holding layout-specific params */ 345 }; 346 347 /***************************************************************************************** 348 * 349 * The mapping code returns a pointer to a list of AccessStripeMap structures, which 350 * describes all the mapping information about an access. The list contains one 351 * AccessStripeMap structure per stripe touched by the access. Each element in the list 352 * contains a stripe identifier and a pointer to a list of PhysDiskAddr structuress. Each 353 * element in this latter list describes the physical location of a stripe unit accessed 354 * within the corresponding stripe. 355 * 356 ****************************************************************************************/ 357 358 #define RF_PDA_TYPE_DATA 0 359 #define RF_PDA_TYPE_PARITY 1 360 #define RF_PDA_TYPE_Q 2 361 362 struct RF_PhysDiskAddr_s { 363 RF_RowCol_t row,col; /* disk identifier */ 364 RF_SectorNum_t startSector; /* sector offset into the disk */ 365 RF_SectorCount_t numSector; /* number of sectors accessed */ 366 int type; /* used by higher levels: currently, data, parity, or q */ 367 caddr_t bufPtr; /* pointer to buffer supplying/receiving data */ 368 RF_RaidAddr_t raidAddress; /* raid address corresponding to this physical disk address */ 369 RF_PhysDiskAddr_t *next; 370 }; 371 372 #define RF_MAX_FAILED_PDA RF_MAXCOL 373 374 struct RF_AccessStripeMap_s { 375 RF_StripeNum_t stripeID; /* the stripe index */ 376 RF_RaidAddr_t raidAddress; /* the starting raid address within this stripe */ 377 RF_RaidAddr_t endRaidAddress; /* raid address one sector past the end of the access */ 378 RF_SectorCount_t totalSectorsAccessed; /* total num sectors identified in physInfo list */ 379 RF_StripeCount_t numStripeUnitsAccessed; /* total num elements in physInfo list */ 380 int numDataFailed; /* number of failed data disks accessed */ 381 int numParityFailed; /* number of failed parity disks accessed (0 or 1) */ 382 int numQFailed; /* number of failed Q units accessed (0 or 1) */ 383 RF_AccessStripeMapFlags_t flags; /* various flags */ 384 #if 0 385 RF_PhysDiskAddr_t *failedPDA; /* points to the PDA that has failed */ 386 RF_PhysDiskAddr_t *failedPDAtwo; /* points to the second PDA that has failed, if any */ 387 #else 388 int numFailedPDAs; /* number of failed phys addrs */ 389 RF_PhysDiskAddr_t *failedPDAs[RF_MAX_FAILED_PDA]; /* array of failed phys addrs */ 390 #endif 391 RF_PhysDiskAddr_t *physInfo; /* a list of PhysDiskAddr structs */ 392 RF_PhysDiskAddr_t *parityInfo; /* list of physical addrs for the parity (P of P + Q ) */ 393 RF_PhysDiskAddr_t *qInfo; /* list of physical addrs for the Q of P + Q */ 394 RF_LockReqDesc_t lockReqDesc; /* used for stripe locking */ 395 RF_RowCol_t origRow; /* the original row: we may redirect the acc to a different row */ 396 RF_AccessStripeMap_t *next; 397 }; 398 399 /* flag values */ 400 #define RF_ASM_REDIR_LARGE_WRITE 0x00000001 /* allows large-write creation code to redirect failed accs */ 401 #define RF_ASM_BAILOUT_DAG_USED 0x00000002 /* allows us to detect recursive calls to the bailout write dag */ 402 #define RF_ASM_FLAGS_LOCK_TRIED 0x00000004 /* we've acquired the lock on the first parity range in this parity stripe */ 403 #define RF_ASM_FLAGS_LOCK_TRIED2 0x00000008 /* we've acquired the lock on the 2nd parity range in this parity stripe */ 404 #define RF_ASM_FLAGS_FORCE_TRIED 0x00000010 /* we've done the force-recon call on this parity stripe */ 405 #define RF_ASM_FLAGS_RECON_BLOCKED 0x00000020 /* we blocked recon => we must unblock it later */ 406 407 struct RF_AccessStripeMapHeader_s { 408 RF_StripeCount_t numStripes; /* total number of stripes touched by this acc */ 409 RF_AccessStripeMap_t *stripeMap; /* pointer to the actual map. Also used for making lists */ 410 RF_AccessStripeMapHeader_t *next; 411 }; 412 413 /***************************************************************************************** 414 * 415 * various routines mapping addresses in the RAID address space. These work across 416 * all layouts. DON'T PUT ANY LAYOUT-SPECIFIC CODE HERE. 417 * 418 ****************************************************************************************/ 419 420 /* return the identifier of the stripe containing the given address */ 421 #define rf_RaidAddressToStripeID(_layoutPtr_, _addr_) \ 422 ( ((_addr_) / (_layoutPtr_)->sectorsPerStripeUnit) / (_layoutPtr_)->numDataCol ) 423 424 /* return the raid address of the start of the indicates stripe ID */ 425 #define rf_StripeIDToRaidAddress(_layoutPtr_, _sid_) \ 426 ( ((_sid_) * (_layoutPtr_)->sectorsPerStripeUnit) * (_layoutPtr_)->numDataCol ) 427 428 /* return the identifier of the stripe containing the given stripe unit id */ 429 #define rf_StripeUnitIDToStripeID(_layoutPtr_, _addr_) \ 430 ( (_addr_) / (_layoutPtr_)->numDataCol ) 431 432 /* return the identifier of the stripe unit containing the given address */ 433 #define rf_RaidAddressToStripeUnitID(_layoutPtr_, _addr_) \ 434 ( ((_addr_) / (_layoutPtr_)->sectorsPerStripeUnit) ) 435 436 /* return the RAID address of next stripe boundary beyond the given address */ 437 #define rf_RaidAddressOfNextStripeBoundary(_layoutPtr_, _addr_) \ 438 ( (((_addr_)/(_layoutPtr_)->dataSectorsPerStripe)+1) * (_layoutPtr_)->dataSectorsPerStripe ) 439 440 /* return the RAID address of the start of the stripe containing the given address */ 441 #define rf_RaidAddressOfPrevStripeBoundary(_layoutPtr_, _addr_) \ 442 ( (((_addr_)/(_layoutPtr_)->dataSectorsPerStripe)+0) * (_layoutPtr_)->dataSectorsPerStripe ) 443 444 /* return the RAID address of next stripe unit boundary beyond the given address */ 445 #define rf_RaidAddressOfNextStripeUnitBoundary(_layoutPtr_, _addr_) \ 446 ( (((_addr_)/(_layoutPtr_)->sectorsPerStripeUnit)+1L)*(_layoutPtr_)->sectorsPerStripeUnit ) 447 448 /* return the RAID address of the start of the stripe unit containing RAID address _addr_ */ 449 #define rf_RaidAddressOfPrevStripeUnitBoundary(_layoutPtr_, _addr_) \ 450 ( (((_addr_)/(_layoutPtr_)->sectorsPerStripeUnit)+0)*(_layoutPtr_)->sectorsPerStripeUnit ) 451 452 /* returns the offset into the stripe. used by RaidAddressStripeAligned */ 453 #define rf_RaidAddressStripeOffset(_layoutPtr_, _addr_) \ 454 ( (_addr_) % ((_layoutPtr_)->dataSectorsPerStripe) ) 455 456 /* returns the offset into the stripe unit. */ 457 #define rf_StripeUnitOffset(_layoutPtr_, _addr_) \ 458 ( (_addr_) % ((_layoutPtr_)->sectorsPerStripeUnit) ) 459 460 /* returns nonzero if the given RAID address is stripe-aligned */ 461 #define rf_RaidAddressStripeAligned( __layoutPtr__, __addr__ ) \ 462 ( rf_RaidAddressStripeOffset(__layoutPtr__, __addr__) == 0 ) 463 464 /* returns nonzero if the given address is stripe-unit aligned */ 465 #define rf_StripeUnitAligned( __layoutPtr__, __addr__ ) \ 466 ( rf_StripeUnitOffset(__layoutPtr__, __addr__) == 0 ) 467 468 /* convert an address expressed in RAID blocks to/from an addr expressed in bytes */ 469 #define rf_RaidAddressToByte(_raidPtr_, _addr_) \ 470 ( (_addr_) << ( (_raidPtr_)->logBytesPerSector ) ) 471 472 #define rf_ByteToRaidAddress(_raidPtr_, _addr_) \ 473 ( (_addr_) >> ( (_raidPtr_)->logBytesPerSector ) ) 474 475 /* convert a raid address to/from a parity stripe ID. Conversion to raid address is easy, 476 * since we're asking for the address of the first sector in the parity stripe. Conversion to a 477 * parity stripe ID is more complex, since stripes are not contiguously allocated in 478 * parity stripes. 479 */ 480 #define rf_RaidAddressToParityStripeID(_layoutPtr_, _addr_, _ru_num_) \ 481 rf_MapStripeIDToParityStripeID( (_layoutPtr_), rf_RaidAddressToStripeID( (_layoutPtr_), (_addr_) ), (_ru_num_) ) 482 483 #define rf_ParityStripeIDToRaidAddress(_layoutPtr_, _psid_) \ 484 ( (_psid_) * (_layoutPtr_)->SUsPerPU * (_layoutPtr_)->numDataCol * (_layoutPtr_)->sectorsPerStripeUnit ) 485 486 RF_LayoutSW_t *rf_GetLayout(RF_ParityConfig_t parityConfig); 487 int rf_ConfigureLayout(RF_ShutdownList_t **listp, RF_Raid_t *raidPtr, 488 RF_Config_t *cfgPtr); 489 RF_StripeNum_t rf_MapStripeIDToParityStripeID(RF_RaidLayout_t *layoutPtr, 490 RF_StripeNum_t stripeID, RF_ReconUnitNum_t *which_ru); 491 492 #endif /* !_RF__RF_LAYOUT_H_ */ 493
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