1 /* $NetBSD: rf_psstatus.c,v 1.3 1999/02/05 00:06:15 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 /***************************************************************************** 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 "rf_types.h" 40 #include "rf_raid.h" 41 #include "rf_threadid.h" 42 #include "rf_general.h" 43 #include "rf_debugprint.h" 44 #include "rf_freelist.h" 45 #include "rf_psstatus.h" 46 #include "rf_shutdown.h" 47 #include "rf_sys.h" 48 49 #define Dprintf1(s,a) if (rf_pssDebug) rf_debug_printf(s,(void *)((unsigned long)a),NULL,NULL,NULL,NULL,NULL,NULL,NULL) 50 #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) 51 #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) 52 53 static void 54 RealPrintPSStatusTable(RF_Raid_t * raidPtr, 55 RF_PSStatusHeader_t * pssTable); 56 57 #define RF_MAX_FREE_PSS 32 58 #define RF_PSS_INC 8 59 #define RF_PSS_INITIAL 4 60 61 static int init_pss(RF_ReconParityStripeStatus_t *, RF_Raid_t *); 62 static void clean_pss(RF_ReconParityStripeStatus_t *, RF_Raid_t *); 63 static void rf_ShutdownPSStatus(void *); 64 65 static int 66 init_pss(p, raidPtr) 67 RF_ReconParityStripeStatus_t *p; 68 RF_Raid_t *raidPtr; 69 { 70 RF_Calloc(p->issued, raidPtr->numCol, sizeof(char), (char *)); 71 if (p->issued == NULL) 72 return (ENOMEM); 73 return (0); 74 } 75 76 static void 77 clean_pss(p, raidPtr) 78 RF_ReconParityStripeStatus_t *p; 79 RF_Raid_t *raidPtr; 80 { 81 RF_Free(p->issued, raidPtr->numCol * sizeof(char)); 82 } 83 84 static void 85 rf_ShutdownPSStatus(arg) 86 void *arg; 87 { 88 RF_Raid_t *raidPtr = (RF_Raid_t *) arg; 89 90 RF_FREELIST_DESTROY_CLEAN_ARG(raidPtr->pss_freelist, next, (RF_ReconParityStripeStatus_t *), clean_pss, raidPtr); 91 } 92 93 int 94 rf_ConfigurePSStatus( 95 RF_ShutdownList_t ** listp, 96 RF_Raid_t * raidPtr, 97 RF_Config_t * cfgPtr) 98 { 99 int rc; 100 101 raidPtr->pssTableSize = RF_PSS_DEFAULT_TABLESIZE; 102 RF_FREELIST_CREATE(raidPtr->pss_freelist, RF_MAX_FREE_PSS, 103 RF_PSS_INC, sizeof(RF_ReconParityStripeStatus_t)); 104 if (raidPtr->pss_freelist == NULL) 105 return (ENOMEM); 106 rc = rf_ShutdownCreate(listp, rf_ShutdownPSStatus, raidPtr); 107 if (rc) { 108 RF_ERRORMSG3("Unable to add to shutdown list file %s line %d rc=%d\n", 109 __FILE__, __LINE__, rc); 110 rf_ShutdownPSStatus(raidPtr); 111 return (rc); 112 } 113 RF_FREELIST_PRIME_INIT_ARG(raidPtr->pss_freelist, RF_PSS_INITIAL, next, 114 (RF_ReconParityStripeStatus_t *), init_pss, raidPtr); 115 return (0); 116 } 117 /***************************************************************************************** 118 * sets up the pss table 119 * We pre-allocate a bunch of entries to avoid as much as possible having to 120 * malloc up hash chain entries. 121 ****************************************************************************************/ 122 RF_PSStatusHeader_t * 123 rf_MakeParityStripeStatusTable(raidPtr) 124 RF_Raid_t *raidPtr; 125 { 126 RF_PSStatusHeader_t *pssTable; 127 int i, j, rc; 128 129 RF_Calloc(pssTable, raidPtr->pssTableSize, sizeof(RF_PSStatusHeader_t), (RF_PSStatusHeader_t *)); 130 for (i = 0; i < raidPtr->pssTableSize; i++) { 131 rc = rf_mutex_init(&pssTable[i].mutex); 132 if (rc) { 133 RF_ERRORMSG3("Unable to init mutex file %s line %d rc=%d\n", __FILE__, 134 __LINE__, rc); 135 /* fail and deallocate */ 136 for (j = 0; j < i; j++) { 137 rf_mutex_destroy(&pssTable[i].mutex); 138 } 139 RF_Free(pssTable, raidPtr->pssTableSize * sizeof(RF_PSStatusHeader_t)); 140 return (NULL); 141 } 142 } 143 return (pssTable); 144 } 145 146 void 147 rf_FreeParityStripeStatusTable(raidPtr, pssTable) 148 RF_Raid_t *raidPtr; 149 RF_PSStatusHeader_t *pssTable; 150 { 151 int i; 152 153 if (rf_pssDebug) 154 RealPrintPSStatusTable(raidPtr, pssTable); 155 for (i = 0; i < raidPtr->pssTableSize; i++) { 156 if (pssTable[i].chain) { 157 printf("ERROR: pss hash chain not null at recon shutdown\n"); 158 } 159 rf_mutex_destroy(&pssTable[i].mutex); 160 } 161 RF_Free(pssTable, raidPtr->pssTableSize * sizeof(RF_PSStatusHeader_t)); 162 } 163 164 165 /* looks up the status structure for a parity stripe. 166 * if the create_flag is on, creates and returns the status structure it it doesn't exist 167 * otherwise returns NULL if the status structure does not exist 168 * 169 * ASSUMES THE PSS DESCRIPTOR IS LOCKED UPON ENTRY 170 */ 171 RF_ReconParityStripeStatus_t * 172 rf_LookupRUStatus( 173 RF_Raid_t * raidPtr, 174 RF_PSStatusHeader_t * pssTable, 175 RF_StripeNum_t psID, 176 RF_ReconUnitNum_t which_ru, 177 RF_PSSFlags_t flags, /* whether or not to create it if it doesn't 178 * exist + what flags to set initially */ 179 int *created) 180 { 181 RF_PSStatusHeader_t *hdr = &pssTable[RF_HASH_PSID(raidPtr, psID)]; 182 RF_ReconParityStripeStatus_t *p, *pssPtr = hdr->chain; 183 184 *created = 0; 185 for (p = pssPtr; p; p = p->next) { 186 if (p->parityStripeID == psID && p->which_ru == which_ru) 187 break; 188 } 189 190 if (!p && (flags & RF_PSS_CREATE)) { 191 Dprintf2("PSS: creating pss for psid %ld ru %d\n", psID, which_ru); 192 p = rf_AllocPSStatus(raidPtr); 193 p->next = hdr->chain; 194 hdr->chain = p; 195 196 p->parityStripeID = psID; 197 p->which_ru = which_ru; 198 p->flags = flags; 199 p->rbuf = NULL; 200 p->writeRbuf = NULL; 201 p->blockCount = 0; 202 p->procWaitList = NULL; 203 p->blockWaitList = NULL; 204 p->bufWaitList = NULL; 205 *created = 1; 206 } else 207 if (p) { /* we didn't create, but we want to specify 208 * some new status */ 209 p->flags |= flags; /* add in whatever flags we're 210 * specifying */ 211 } 212 if (p && (flags & RF_PSS_RECON_BLOCKED)) { 213 int tid; 214 rf_get_threadid(tid); 215 p->blockCount++;/* if we're asking to block recon, bump the 216 * count */ 217 Dprintf3("[%d] Blocked recon on psid %ld. count now %d\n", tid, psID, p->blockCount); 218 } 219 return (p); 220 } 221 /* deletes an entry from the parity stripe status table. typically used 222 * when an entry has been allocated solely to block reconstruction, and 223 * no recon was requested while recon was blocked. Assumes the hash 224 * chain is ALREADY LOCKED. 225 */ 226 void 227 rf_PSStatusDelete(raidPtr, pssTable, pssPtr) 228 RF_Raid_t *raidPtr; 229 RF_PSStatusHeader_t *pssTable; 230 RF_ReconParityStripeStatus_t *pssPtr; 231 { 232 RF_PSStatusHeader_t *hdr = &(pssTable[RF_HASH_PSID(raidPtr, pssPtr->parityStripeID)]); 233 RF_ReconParityStripeStatus_t *p = hdr->chain, *pt = NULL; 234 235 while (p) { 236 if (p == pssPtr) { 237 if (pt) 238 pt->next = p->next; 239 else 240 hdr->chain = p->next; 241 p->next = NULL; 242 rf_FreePSStatus(raidPtr, p); 243 return; 244 } 245 pt = p; 246 p = p->next; 247 } 248 RF_ASSERT(0); /* we must find it here */ 249 } 250 /* deletes an entry from the ps status table after reconstruction has completed */ 251 void 252 rf_RemoveFromActiveReconTable(raidPtr, row, psid, which_ru) 253 RF_Raid_t *raidPtr; 254 RF_RowCol_t row; 255 RF_ReconUnitNum_t which_ru; 256 RF_StripeNum_t psid; 257 { 258 RF_PSStatusHeader_t *hdr = &(raidPtr->reconControl[row]->pssTable[RF_HASH_PSID(raidPtr, psid)]); 259 RF_ReconParityStripeStatus_t *p, *pt; 260 RF_CallbackDesc_t *cb, *cb1; 261 262 RF_LOCK_MUTEX(hdr->mutex); 263 for (pt = NULL, p = hdr->chain; p; pt = p, p = p->next) { 264 if ((p->parityStripeID == psid) && (p->which_ru == which_ru)) 265 break; 266 } 267 if (p == NULL) { 268 rf_PrintPSStatusTable(raidPtr, row); 269 } 270 RF_ASSERT(p); /* it must be there */ 271 272 Dprintf2("PSS: deleting pss for psid %ld ru %d\n", psid, which_ru); 273 274 /* delete this entry from the hash chain */ 275 if (pt) 276 pt->next = p->next; 277 else 278 hdr->chain = p->next; 279 p->next = NULL; 280 281 RF_UNLOCK_MUTEX(hdr->mutex); 282 283 /* wakup anyone waiting on the parity stripe ID */ 284 cb = p->procWaitList; 285 p->procWaitList = NULL; 286 while (cb) { 287 Dprintf1("Waking up access waiting on parity stripe ID %ld\n", p->parityStripeID); 288 cb1 = cb->next; 289 (cb->callbackFunc) (cb->callbackArg); 290 291 /* THIS IS WHAT THE ORIGINAL CODE HAD... the extra 0 is bogus, 292 * IMHO */ 293 /* (cb->callbackFunc)(cb->callbackArg, 0); */ 294 rf_FreeCallbackDesc(cb); 295 cb = cb1; 296 } 297 298 rf_FreePSStatus(raidPtr, p); 299 } 300 301 RF_ReconParityStripeStatus_t * 302 rf_AllocPSStatus(raidPtr) 303 RF_Raid_t *raidPtr; 304 { 305 RF_ReconParityStripeStatus_t *p; 306 307 RF_FREELIST_GET_INIT_ARG(raidPtr->pss_freelist, p, next, (RF_ReconParityStripeStatus_t *), init_pss, raidPtr); 308 if (p) { 309 bzero(p->issued, raidPtr->numCol); 310 } 311 p->next = NULL; 312 /* no need to initialize here b/c the only place we're called from is 313 * the above Lookup */ 314 return (p); 315 } 316 317 void 318 rf_FreePSStatus(raidPtr, p) 319 RF_Raid_t *raidPtr; 320 RF_ReconParityStripeStatus_t *p; 321 { 322 RF_ASSERT(p->procWaitList == NULL); 323 RF_ASSERT(p->blockWaitList == NULL); 324 RF_ASSERT(p->bufWaitList == NULL); 325 326 RF_FREELIST_FREE_CLEAN_ARG(raidPtr->pss_freelist, p, next, clean_pss, raidPtr); 327 } 328 329 static void 330 RealPrintPSStatusTable(raidPtr, pssTable) 331 RF_Raid_t *raidPtr; 332 RF_PSStatusHeader_t *pssTable; 333 { 334 int i, j, procsWaiting, blocksWaiting, bufsWaiting; 335 RF_ReconParityStripeStatus_t *p; 336 RF_CallbackDesc_t *cb; 337 338 printf("\nParity Stripe Status Table\n"); 339 for (i = 0; i < raidPtr->pssTableSize; i++) { 340 for (p = pssTable[i].chain; p; p = p->next) { 341 procsWaiting = blocksWaiting = bufsWaiting = 0; 342 for (cb = p->procWaitList; cb; cb = cb->next) 343 procsWaiting++; 344 for (cb = p->blockWaitList; cb; cb = cb->next) 345 blocksWaiting++; 346 for (cb = p->bufWaitList; cb; cb = cb->next) 347 bufsWaiting++; 348 printf("PSID %ld RU %d : blockCount %d %d/%d/%d proc/block/buf waiting, issued ", 349 (long) p->parityStripeID, p->which_ru, p->blockCount, procsWaiting, blocksWaiting, bufsWaiting); 350 for (j = 0; j < raidPtr->numCol; j++) 351 printf("%c", (p->issued[j]) ? '1' : '0'); 352 if (!p->flags) 353 printf(" flags: (none)"); 354 else { 355 if (p->flags & RF_PSS_UNDER_RECON) 356 printf(" under-recon"); 357 if (p->flags & RF_PSS_FORCED_ON_WRITE) 358 printf(" forced-w"); 359 if (p->flags & RF_PSS_FORCED_ON_READ) 360 printf(" forced-r"); 361 if (p->flags & RF_PSS_RECON_BLOCKED) 362 printf(" blocked"); 363 if (p->flags & RF_PSS_BUFFERWAIT) 364 printf(" bufwait"); 365 } 366 printf("\n"); 367 } 368 } 369 } 370 371 void 372 rf_PrintPSStatusTable(raidPtr, row) 373 RF_Raid_t *raidPtr; 374 RF_RowCol_t row; 375 { 376 RF_PSStatusHeader_t *pssTable = raidPtr->reconControl[row]->pssTable; 377 RealPrintPSStatusTable(raidPtr, pssTable); 378 } 379