rf_reconutil.c revision 1.10
1 /* $NetBSD: rf_reconutil.c,v 1.10 2002/09/17 03:21:41 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 /******************************************** 30 * rf_reconutil.c -- reconstruction utilities 31 ********************************************/ 32 33 #include <sys/cdefs.h> 34 __KERNEL_RCSID(0, "$NetBSD: rf_reconutil.c,v 1.10 2002/09/17 03:21:41 oster Exp $"); 35 36 #include <dev/raidframe/raidframevar.h> 37 38 #include "rf_raid.h" 39 #include "rf_desc.h" 40 #include "rf_reconutil.h" 41 #include "rf_reconbuffer.h" 42 #include "rf_general.h" 43 #include "rf_decluster.h" 44 #include "rf_raid5_rotatedspare.h" 45 #include "rf_interdecluster.h" 46 #include "rf_chaindecluster.h" 47 48 /******************************************************************* 49 * allocates/frees the reconstruction control information structures 50 *******************************************************************/ 51 RF_ReconCtrl_t * 52 rf_MakeReconControl(reconDesc, frow, fcol, srow, scol) 53 RF_RaidReconDesc_t *reconDesc; 54 RF_RowCol_t frow; /* failed row and column */ 55 RF_RowCol_t fcol; 56 RF_RowCol_t srow; /* identifies which spare we're using */ 57 RF_RowCol_t scol; 58 { 59 RF_Raid_t *raidPtr = reconDesc->raidPtr; 60 RF_RaidLayout_t *layoutPtr = &raidPtr->Layout; 61 RF_ReconUnitCount_t RUsPerPU = layoutPtr->SUsPerPU / layoutPtr->SUsPerRU; 62 RF_ReconUnitCount_t numSpareRUs; 63 RF_ReconCtrl_t *reconCtrlPtr; 64 RF_ReconBuffer_t *rbuf; 65 RF_LayoutSW_t *lp; 66 int retcode, rc; 67 RF_RowCol_t i; 68 69 lp = raidPtr->Layout.map; 70 71 /* make and zero the global reconstruction structure and the per-disk 72 * structure */ 73 RF_Calloc(reconCtrlPtr, 1, sizeof(RF_ReconCtrl_t), (RF_ReconCtrl_t *)); 74 RF_Calloc(reconCtrlPtr->perDiskInfo, raidPtr->numCol, sizeof(RF_PerDiskReconCtrl_t), (RF_PerDiskReconCtrl_t *)); /* this zeros it */ 75 reconCtrlPtr->reconDesc = reconDesc; 76 reconCtrlPtr->fcol = fcol; 77 reconCtrlPtr->spareRow = srow; 78 reconCtrlPtr->spareCol = scol; 79 reconCtrlPtr->lastPSID = layoutPtr->numStripe / layoutPtr->SUsPerPU; 80 reconCtrlPtr->percentComplete = 0; 81 82 /* initialize each per-disk recon information structure */ 83 for (i = 0; i < raidPtr->numCol; i++) { 84 reconCtrlPtr->perDiskInfo[i].reconCtrl = reconCtrlPtr; 85 reconCtrlPtr->perDiskInfo[i].row = frow; 86 reconCtrlPtr->perDiskInfo[i].col = i; 87 reconCtrlPtr->perDiskInfo[i].curPSID = -1; /* make it appear as if 88 * we just finished an 89 * RU */ 90 reconCtrlPtr->perDiskInfo[i].ru_count = RUsPerPU - 1; 91 } 92 93 /* Get the number of spare units per disk and the sparemap in case 94 * spare is distributed */ 95 96 if (lp->GetNumSpareRUs) { 97 numSpareRUs = lp->GetNumSpareRUs(raidPtr); 98 } else { 99 numSpareRUs = 0; 100 } 101 102 /* 103 * Not all distributed sparing archs need dynamic mappings 104 */ 105 if (lp->InstallSpareTable) { 106 retcode = rf_InstallSpareTable(raidPtr, frow, fcol); 107 if (retcode) { 108 RF_PANIC(); /* XXX fix this */ 109 } 110 } 111 /* make the reconstruction map */ 112 reconCtrlPtr->reconMap = rf_MakeReconMap(raidPtr, (int) (layoutPtr->SUsPerRU * layoutPtr->sectorsPerStripeUnit), 113 raidPtr->sectorsPerDisk, numSpareRUs); 114 115 /* make the per-disk reconstruction buffers */ 116 for (i = 0; i < raidPtr->numCol; i++) { 117 reconCtrlPtr->perDiskInfo[i].rbuf = (i == fcol) ? NULL : rf_MakeReconBuffer(raidPtr, frow, i, RF_RBUF_TYPE_EXCLUSIVE); 118 } 119 120 /* initialize the event queue */ 121 rc = rf_mutex_init(&reconCtrlPtr->eq_mutex); 122 if (rc) { 123 /* XXX deallocate, cleanup */ 124 rf_print_unable_to_init_mutex(__FILE__, __LINE__, rc); 125 return (NULL); 126 } 127 rc = rf_cond_init(&reconCtrlPtr->eq_cond); 128 if (rc) { 129 /* XXX deallocate, cleanup */ 130 rf_print_unable_to_init_cond(__FILE__, __LINE__, rc); 131 return (NULL); 132 } 133 reconCtrlPtr->eventQueue = NULL; 134 reconCtrlPtr->eq_count = 0; 135 136 /* make the floating recon buffers and append them to the free list */ 137 rc = rf_mutex_init(&reconCtrlPtr->rb_mutex); 138 if (rc) { 139 /* XXX deallocate, cleanup */ 140 rf_print_unable_to_init_mutex(__FILE__, __LINE__, rc); 141 return (NULL); 142 } 143 reconCtrlPtr->fullBufferList = NULL; 144 reconCtrlPtr->priorityList = NULL; 145 reconCtrlPtr->floatingRbufs = NULL; 146 reconCtrlPtr->committedRbufs = NULL; 147 for (i = 0; i < raidPtr->numFloatingReconBufs; i++) { 148 rbuf = rf_MakeReconBuffer(raidPtr, frow, fcol, RF_RBUF_TYPE_FLOATING); 149 rbuf->next = reconCtrlPtr->floatingRbufs; 150 reconCtrlPtr->floatingRbufs = rbuf; 151 } 152 153 /* create the parity stripe status table */ 154 reconCtrlPtr->pssTable = rf_MakeParityStripeStatusTable(raidPtr); 155 156 /* set the initial min head sep counter val */ 157 reconCtrlPtr->minHeadSepCounter = 0; 158 159 return (reconCtrlPtr); 160 } 161 162 void 163 rf_FreeReconControl(raidPtr, row) 164 RF_Raid_t *raidPtr; 165 RF_RowCol_t row; 166 { 167 RF_ReconCtrl_t *reconCtrlPtr = raidPtr->reconControl[row]; 168 RF_ReconBuffer_t *t; 169 RF_ReconUnitNum_t i; 170 171 RF_ASSERT(reconCtrlPtr); 172 for (i = 0; i < raidPtr->numCol; i++) 173 if (reconCtrlPtr->perDiskInfo[i].rbuf) 174 rf_FreeReconBuffer(reconCtrlPtr->perDiskInfo[i].rbuf); 175 for (i = 0; i < raidPtr->numFloatingReconBufs; i++) { 176 t = reconCtrlPtr->floatingRbufs; 177 RF_ASSERT(t); 178 reconCtrlPtr->floatingRbufs = t->next; 179 rf_FreeReconBuffer(t); 180 } 181 rf_mutex_destroy(&reconCtrlPtr->rb_mutex); 182 rf_mutex_destroy(&reconCtrlPtr->eq_mutex); 183 rf_cond_destroy(&reconCtrlPtr->eq_cond); 184 rf_FreeReconMap(reconCtrlPtr->reconMap); 185 rf_FreeParityStripeStatusTable(raidPtr, reconCtrlPtr->pssTable); 186 RF_Free(reconCtrlPtr->perDiskInfo, raidPtr->numCol * sizeof(RF_PerDiskReconCtrl_t)); 187 RF_Free(reconCtrlPtr, sizeof(*reconCtrlPtr)); 188 } 189 190 191 /****************************************************************************** 192 * computes the default head separation limit 193 *****************************************************************************/ 194 RF_HeadSepLimit_t 195 rf_GetDefaultHeadSepLimit(raidPtr) 196 RF_Raid_t *raidPtr; 197 { 198 RF_HeadSepLimit_t hsl; 199 RF_LayoutSW_t *lp; 200 201 lp = raidPtr->Layout.map; 202 if (lp->GetDefaultHeadSepLimit == NULL) 203 return (-1); 204 hsl = lp->GetDefaultHeadSepLimit(raidPtr); 205 return (hsl); 206 } 207 208 209 /****************************************************************************** 210 * computes the default number of floating recon buffers 211 *****************************************************************************/ 212 int 213 rf_GetDefaultNumFloatingReconBuffers(raidPtr) 214 RF_Raid_t *raidPtr; 215 { 216 RF_LayoutSW_t *lp; 217 int nrb; 218 219 lp = raidPtr->Layout.map; 220 if (lp->GetDefaultNumFloatingReconBuffers == NULL) 221 return (3 * raidPtr->numCol); 222 nrb = lp->GetDefaultNumFloatingReconBuffers(raidPtr); 223 return (nrb); 224 } 225 226 227 /****************************************************************************** 228 * creates and initializes a reconstruction buffer 229 *****************************************************************************/ 230 RF_ReconBuffer_t * 231 rf_MakeReconBuffer( 232 RF_Raid_t * raidPtr, 233 RF_RowCol_t row, 234 RF_RowCol_t col, 235 RF_RbufType_t type) 236 { 237 RF_RaidLayout_t *layoutPtr = &raidPtr->Layout; 238 RF_ReconBuffer_t *t; 239 u_int recon_buffer_size = rf_RaidAddressToByte(raidPtr, layoutPtr->SUsPerRU * layoutPtr->sectorsPerStripeUnit); 240 241 RF_Malloc(t, sizeof(RF_ReconBuffer_t), (RF_ReconBuffer_t *)); 242 RF_Malloc(t->buffer, recon_buffer_size, (caddr_t)); 243 t->raidPtr = raidPtr; 244 t->row = row; 245 t->col = col; 246 t->priority = RF_IO_RECON_PRIORITY; 247 t->type = type; 248 t->pssPtr = NULL; 249 t->next = NULL; 250 return (t); 251 } 252 /****************************************************************************** 253 * frees a reconstruction buffer 254 *****************************************************************************/ 255 void 256 rf_FreeReconBuffer(rbuf) 257 RF_ReconBuffer_t *rbuf; 258 { 259 RF_Raid_t *raidPtr = rbuf->raidPtr; 260 u_int recon_buffer_size; 261 262 recon_buffer_size = rf_RaidAddressToByte(raidPtr, raidPtr->Layout.SUsPerRU * raidPtr->Layout.sectorsPerStripeUnit); 263 264 RF_Free(rbuf->buffer, recon_buffer_size); 265 RF_Free(rbuf, sizeof(*rbuf)); 266 } 267 268 #if RF_DEBUG_RECON 269 /****************************************************************************** 270 * debug only: sanity check the number of floating recon bufs in use 271 *****************************************************************************/ 272 void 273 rf_CheckFloatingRbufCount(raidPtr, dolock) 274 RF_Raid_t *raidPtr; 275 int dolock; 276 { 277 RF_ReconParityStripeStatus_t *p; 278 RF_PSStatusHeader_t *pssTable; 279 RF_ReconBuffer_t *rbuf; 280 int i, j, sum = 0; 281 RF_RowCol_t frow = 0; 282 283 for (i = 0; i < raidPtr->numRow; i++) 284 if (raidPtr->reconControl[i]) { 285 frow = i; 286 break; 287 } 288 RF_ASSERT(frow >= 0); 289 290 if (dolock) 291 RF_LOCK_MUTEX(raidPtr->reconControl[frow]->rb_mutex); 292 pssTable = raidPtr->reconControl[frow]->pssTable; 293 294 for (i = 0; i < raidPtr->pssTableSize; i++) { 295 RF_LOCK_MUTEX(pssTable[i].mutex); 296 for (p = pssTable[i].chain; p; p = p->next) { 297 rbuf = (RF_ReconBuffer_t *) p->rbuf; 298 if (rbuf && rbuf->type == RF_RBUF_TYPE_FLOATING) 299 sum++; 300 301 rbuf = (RF_ReconBuffer_t *) p->writeRbuf; 302 if (rbuf && rbuf->type == RF_RBUF_TYPE_FLOATING) 303 sum++; 304 305 for (j = 0; j < p->xorBufCount; j++) { 306 rbuf = (RF_ReconBuffer_t *) p->rbufsForXor[j]; 307 RF_ASSERT(rbuf); 308 if (rbuf->type == RF_RBUF_TYPE_FLOATING) 309 sum++; 310 } 311 } 312 RF_UNLOCK_MUTEX(pssTable[i].mutex); 313 } 314 315 for (rbuf = raidPtr->reconControl[frow]->floatingRbufs; rbuf; rbuf = rbuf->next) { 316 if (rbuf->type == RF_RBUF_TYPE_FLOATING) 317 sum++; 318 } 319 for (rbuf = raidPtr->reconControl[frow]->committedRbufs; rbuf; rbuf = rbuf->next) { 320 if (rbuf->type == RF_RBUF_TYPE_FLOATING) 321 sum++; 322 } 323 for (rbuf = raidPtr->reconControl[frow]->fullBufferList; rbuf; rbuf = rbuf->next) { 324 if (rbuf->type == RF_RBUF_TYPE_FLOATING) 325 sum++; 326 } 327 for (rbuf = raidPtr->reconControl[frow]->priorityList; rbuf; rbuf = rbuf->next) { 328 if (rbuf->type == RF_RBUF_TYPE_FLOATING) 329 sum++; 330 } 331 332 RF_ASSERT(sum == raidPtr->numFloatingReconBufs); 333 334 if (dolock) 335 RF_UNLOCK_MUTEX(raidPtr->reconControl[frow]->rb_mutex); 336 } 337 #endif 338 339
Indexes created Tue Sep 23 02:09:52 GMT 2025