rf_psstatus.c revision 1.10
1 /* $NetBSD: rf_psstatus.c,v 1.10 2002/09/19 22:52:52 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 * 31 * psstatus.c 32 * 33 * The reconstruction code maintains a bunch of status related to the parity 34 * stripes that are currently under reconstruction. This header file defines 35 * the status structures. 36 * 37 *****************************************************************************/ 38 39 #include <sys/cdefs.h> 40 __KERNEL_RCSID(0, "$NetBSD: rf_psstatus.c,v 1.10 2002/09/19 22:52:52 oster Exp $"); 41 42 #include <dev/raidframe/raidframevar.h> 43 44 #include "rf_raid.h" 45 #include "rf_general.h" 46 #include "rf_debugprint.h" 47 #include "rf_freelist.h" 48 #include "rf_psstatus.h" 49 #include "rf_shutdown.h" 50 51 #if RF_DEBUG_PSS 52 #define Dprintf1(s,a) if (rf_pssDebug) rf_debug_printf(s,(void *)((unsigned long)a),NULL,NULL,NULL,NULL,NULL,NULL,NULL) 53 #define Dprintf2(s,a,b) if (rf_pssDebug) rf_debug_printf(s,(void *)((unsigned long)a),(void *)((unsigned long)b),NULL,NULL,NULL,NULL,NULL,NULL) 54 #define Dprintf3(s,a,b,c) if (rf_pssDebug) rf_debug_printf(s,(void *)((unsigned long)a),(void *)((unsigned long)b),(void *)((unsigned long)c),NULL,NULL,NULL,NULL,NULL) 55 #else 56 #define Dprintf1(s,a) 57 #define Dprintf2(s,a,b) 58 #define Dprintf3(s,a,b,c) 59 #endif 60 61 static void 62 RealPrintPSStatusTable(RF_Raid_t * raidPtr, 63 RF_PSStatusHeader_t * pssTable); 64 65 #define RF_MAX_FREE_PSS 32 66 #define RF_PSS_INC 8 67 #define RF_PSS_INITIAL 4 68 69 static int init_pss(RF_ReconParityStripeStatus_t *, RF_Raid_t *); 70 static void clean_pss(RF_ReconParityStripeStatus_t *, RF_Raid_t *); 71 static void rf_ShutdownPSStatus(void *); 72 73 static int 74 init_pss(p, raidPtr) 75 RF_ReconParityStripeStatus_t *p; 76 RF_Raid_t *raidPtr; 77 { 78 RF_Calloc(p->issued, raidPtr->numCol, sizeof(char), (char *)); 79 if (p->issued == NULL) 80 return (ENOMEM); 81 return (0); 82 } 83 84 static void 85 clean_pss(p, raidPtr) 86 RF_ReconParityStripeStatus_t *p; 87 RF_Raid_t *raidPtr; 88 { 89 RF_Free(p->issued, raidPtr->numCol * sizeof(char)); 90 } 91 92 static void 93 rf_ShutdownPSStatus(arg) 94 void *arg; 95 { 96 RF_Raid_t *raidPtr = (RF_Raid_t *) arg; 97 98 RF_FREELIST_DESTROY_CLEAN_ARG(raidPtr->pss_freelist, next, (RF_ReconParityStripeStatus_t *), clean_pss, raidPtr); 99 } 100 101 int 102 rf_ConfigurePSStatus( 103 RF_ShutdownList_t ** listp, 104 RF_Raid_t * raidPtr, 105 RF_Config_t * cfgPtr) 106 { 107 int rc; 108 109 raidPtr->pssTableSize = RF_PSS_DEFAULT_TABLESIZE; 110 RF_FREELIST_CREATE(raidPtr->pss_freelist, RF_MAX_FREE_PSS, 111 RF_PSS_INC, sizeof(RF_ReconParityStripeStatus_t)); 112 if (raidPtr->pss_freelist == NULL) 113 return (ENOMEM); 114 rc = rf_ShutdownCreate(listp, rf_ShutdownPSStatus, raidPtr); 115 if (rc) { 116 rf_print_unable_to_add_shutdown(__FILE__, __LINE__, rc); 117 rf_ShutdownPSStatus(raidPtr); 118 return (rc); 119 } 120 RF_FREELIST_PRIME_INIT_ARG(raidPtr->pss_freelist, RF_PSS_INITIAL, next, 121 (RF_ReconParityStripeStatus_t *), init_pss, raidPtr); 122 return (0); 123 } 124 /***************************************************************************************** 125 * sets up the pss table 126 * We pre-allocate a bunch of entries to avoid as much as possible having to 127 * malloc up hash chain entries. 128 ****************************************************************************************/ 129 RF_PSStatusHeader_t * 130 rf_MakeParityStripeStatusTable(raidPtr) 131 RF_Raid_t *raidPtr; 132 { 133 RF_PSStatusHeader_t *pssTable; 134 int i, j, rc; 135 136 RF_Calloc(pssTable, raidPtr->pssTableSize, sizeof(RF_PSStatusHeader_t), (RF_PSStatusHeader_t *)); 137 for (i = 0; i < raidPtr->pssTableSize; i++) { 138 rc = rf_mutex_init(&pssTable[i].mutex); 139 if (rc) { 140 rf_print_unable_to_init_mutex(__FILE__, __LINE__, rc); 141 /* fail and deallocate */ 142 for (j = 0; j < i; j++) { 143 rf_mutex_destroy(&pssTable[i].mutex); 144 } 145 RF_Free(pssTable, raidPtr->pssTableSize * sizeof(RF_PSStatusHeader_t)); 146 return (NULL); 147 } 148 } 149 return (pssTable); 150 } 151 152 void 153 rf_FreeParityStripeStatusTable(raidPtr, pssTable) 154 RF_Raid_t *raidPtr; 155 RF_PSStatusHeader_t *pssTable; 156 { 157 int i; 158 159 #if RF_DEBUG_PSS 160 if (rf_pssDebug) 161 RealPrintPSStatusTable(raidPtr, pssTable); 162 #endif 163 for (i = 0; i < raidPtr->pssTableSize; i++) { 164 if (pssTable[i].chain) { 165 printf("ERROR: pss hash chain not null at recon shutdown\n"); 166 } 167 rf_mutex_destroy(&pssTable[i].mutex); 168 } 169 RF_Free(pssTable, raidPtr->pssTableSize * sizeof(RF_PSStatusHeader_t)); 170 } 171 172 173 /* looks up the status structure for a parity stripe. 174 * if the create_flag is on, creates and returns the status structure it it doesn't exist 175 * otherwise returns NULL if the status structure does not exist 176 * 177 * ASSUMES THE PSS DESCRIPTOR IS LOCKED UPON ENTRY 178 */ 179 RF_ReconParityStripeStatus_t * 180 rf_LookupRUStatus( 181 RF_Raid_t * raidPtr, 182 RF_PSStatusHeader_t * pssTable, 183 RF_StripeNum_t psID, 184 RF_ReconUnitNum_t which_ru, 185 RF_PSSFlags_t flags, /* whether or not to create it if it doesn't 186 * exist + what flags to set initially */ 187 int *created) 188 { 189 RF_PSStatusHeader_t *hdr = &pssTable[RF_HASH_PSID(raidPtr, psID)]; 190 RF_ReconParityStripeStatus_t *p, *pssPtr = hdr->chain; 191 192 *created = 0; 193 for (p = pssPtr; p; p = p->next) { 194 if (p->parityStripeID == psID && p->which_ru == which_ru) 195 break; 196 } 197 198 if (!p && (flags & RF_PSS_CREATE)) { 199 Dprintf2("PSS: creating pss for psid %ld ru %d\n", psID, which_ru); 200 p = rf_AllocPSStatus(raidPtr); 201 p->next = hdr->chain; 202 hdr->chain = p; 203 204 p->parityStripeID = psID; 205 p->which_ru = which_ru; 206 p->flags = flags; 207 p->rbuf = NULL; 208 p->writeRbuf = NULL; 209 p->blockCount = 0; 210 p->procWaitList = NULL; 211 p->blockWaitList = NULL; 212 p->bufWaitList = NULL; 213 *created = 1; 214 } else 215 if (p) { /* we didn't create, but we want to specify 216 * some new status */ 217 p->flags |= flags; /* add in whatever flags we're 218 * specifying */ 219 } 220 if (p && (flags & RF_PSS_RECON_BLOCKED)) { 221 p->blockCount++;/* if we're asking to block recon, bump the 222 * count */ 223 Dprintf3("raid%d: Blocked recon on psid %ld. count now %d\n", 224 raidPtr->raidid, psID, p->blockCount); 225 } 226 return (p); 227 } 228 /* deletes an entry from the parity stripe status table. typically used 229 * when an entry has been allocated solely to block reconstruction, and 230 * no recon was requested while recon was blocked. Assumes the hash 231 * chain is ALREADY LOCKED. 232 */ 233 void 234 rf_PSStatusDelete(raidPtr, pssTable, pssPtr) 235 RF_Raid_t *raidPtr; 236 RF_PSStatusHeader_t *pssTable; 237 RF_ReconParityStripeStatus_t *pssPtr; 238 { 239 RF_PSStatusHeader_t *hdr = &(pssTable[RF_HASH_PSID(raidPtr, pssPtr->parityStripeID)]); 240 RF_ReconParityStripeStatus_t *p = hdr->chain, *pt = NULL; 241 242 while (p) { 243 if (p == pssPtr) { 244 if (pt) 245 pt->next = p->next; 246 else 247 hdr->chain = p->next; 248 p->next = NULL; 249 rf_FreePSStatus(raidPtr, p); 250 return; 251 } 252 pt = p; 253 p = p->next; 254 } 255 RF_ASSERT(0); /* we must find it here */ 256 } 257 /* deletes an entry from the ps status table after reconstruction has completed */ 258 void 259 rf_RemoveFromActiveReconTable(raidPtr, row, psid, which_ru) 260 RF_Raid_t *raidPtr; 261 RF_RowCol_t row; 262 RF_ReconUnitNum_t which_ru; 263 RF_StripeNum_t psid; 264 { 265 RF_PSStatusHeader_t *hdr = &(raidPtr->reconControl[row]->pssTable[RF_HASH_PSID(raidPtr, psid)]); 266 RF_ReconParityStripeStatus_t *p, *pt; 267 RF_CallbackDesc_t *cb, *cb1; 268 269 RF_LOCK_MUTEX(hdr->mutex); 270 for (pt = NULL, p = hdr->chain; p; pt = p, p = p->next) { 271 if ((p->parityStripeID == psid) && (p->which_ru == which_ru)) 272 break; 273 } 274 if (p == NULL) { 275 rf_PrintPSStatusTable(raidPtr, row); 276 } 277 RF_ASSERT(p); /* it must be there */ 278 279 Dprintf2("PSS: deleting pss for psid %ld ru %d\n", psid, which_ru); 280 281 /* delete this entry from the hash chain */ 282 if (pt) 283 pt->next = p->next; 284 else 285 hdr->chain = p->next; 286 p->next = NULL; 287 288 RF_UNLOCK_MUTEX(hdr->mutex); 289 290 /* wakup anyone waiting on the parity stripe ID */ 291 cb = p->procWaitList; 292 p->procWaitList = NULL; 293 while (cb) { 294 Dprintf1("Waking up access waiting on parity stripe ID %ld\n", p->parityStripeID); 295 cb1 = cb->next; 296 (cb->callbackFunc) (cb->callbackArg); 297 298 /* THIS IS WHAT THE ORIGINAL CODE HAD... the extra 0 is bogus, 299 * IMHO */ 300 /* (cb->callbackFunc)(cb->callbackArg, 0); */ 301 rf_FreeCallbackDesc(cb); 302 cb = cb1; 303 } 304 305 rf_FreePSStatus(raidPtr, p); 306 } 307 308 RF_ReconParityStripeStatus_t * 309 rf_AllocPSStatus(raidPtr) 310 RF_Raid_t *raidPtr; 311 { 312 RF_ReconParityStripeStatus_t *p; 313 314 RF_FREELIST_GET_INIT_ARG(raidPtr->pss_freelist, p, next, (RF_ReconParityStripeStatus_t *), init_pss, raidPtr); 315 if (p) { 316 memset(p->issued, 0, raidPtr->numCol); 317 } 318 p->next = NULL; 319 /* no need to initialize here b/c the only place we're called from is 320 * the above Lookup */ 321 return (p); 322 } 323 324 void 325 rf_FreePSStatus(raidPtr, p) 326 RF_Raid_t *raidPtr; 327 RF_ReconParityStripeStatus_t *p; 328 { 329 RF_ASSERT(p->procWaitList == NULL); 330 RF_ASSERT(p->blockWaitList == NULL); 331 RF_ASSERT(p->bufWaitList == NULL); 332 333 RF_FREELIST_FREE_CLEAN_ARG(raidPtr->pss_freelist, p, next, clean_pss, raidPtr); 334 } 335 336 static void 337 RealPrintPSStatusTable(raidPtr, pssTable) 338 RF_Raid_t *raidPtr; 339 RF_PSStatusHeader_t *pssTable; 340 { 341 int i, j, procsWaiting, blocksWaiting, bufsWaiting; 342 RF_ReconParityStripeStatus_t *p; 343 RF_CallbackDesc_t *cb; 344 345 printf("\nParity Stripe Status Table\n"); 346 for (i = 0; i < raidPtr->pssTableSize; i++) { 347 for (p = pssTable[i].chain; p; p = p->next) { 348 procsWaiting = blocksWaiting = bufsWaiting = 0; 349 for (cb = p->procWaitList; cb; cb = cb->next) 350 procsWaiting++; 351 for (cb = p->blockWaitList; cb; cb = cb->next) 352 blocksWaiting++; 353 for (cb = p->bufWaitList; cb; cb = cb->next) 354 bufsWaiting++; 355 printf("PSID %ld RU %d : blockCount %d %d/%d/%d proc/block/buf waiting, issued ", 356 (long) p->parityStripeID, p->which_ru, p->blockCount, procsWaiting, blocksWaiting, bufsWaiting); 357 for (j = 0; j < raidPtr->numCol; j++) 358 printf("%c", (p->issued[j]) ? '1' : '0'); 359 if (!p->flags) 360 printf(" flags: (none)"); 361 else { 362 if (p->flags & RF_PSS_UNDER_RECON) 363 printf(" under-recon"); 364 if (p->flags & RF_PSS_FORCED_ON_WRITE) 365 printf(" forced-w"); 366 if (p->flags & RF_PSS_FORCED_ON_READ) 367 printf(" forced-r"); 368 if (p->flags & RF_PSS_RECON_BLOCKED) 369 printf(" blocked"); 370 if (p->flags & RF_PSS_BUFFERWAIT) 371 printf(" bufwait"); 372 } 373 printf("\n"); 374 } 375 } 376 } 377 378 void 379 rf_PrintPSStatusTable(raidPtr, row) 380 RF_Raid_t *raidPtr; 381 RF_RowCol_t row; 382 { 383 RF_PSStatusHeader_t *pssTable = raidPtr->reconControl[row]->pssTable; 384 RealPrintPSStatusTable(raidPtr, pssTable); 385 } 386
Indexes created Thu Sep 25 16:09:42 GMT 2025