1 /* $NetBSD: rf_psstatus.c,v 1.7 2001/10/04 15:58:55 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 <dev/raidframe/raidframevar.h> 40 41 #include "rf_raid.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 48 #define Dprintf1(s,a) if (rf_pssDebug) rf_debug_printf(s,(void *)((unsigned long)a),NULL,NULL,NULL,NULL,NULL,NULL,NULL) 49 #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) 50 #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) 51 52 static void 53 RealPrintPSStatusTable(RF_Raid_t * raidPtr, 54 RF_PSStatusHeader_t * pssTable); 55 56 #define RF_MAX_FREE_PSS 32 57 #define RF_PSS_INC 8 58 #define RF_PSS_INITIAL 4 59 60 static int init_pss(RF_ReconParityStripeStatus_t *, RF_Raid_t *); 61 static void clean_pss(RF_ReconParityStripeStatus_t *, RF_Raid_t *); 62 static void rf_ShutdownPSStatus(void *); 63 64 static int 65 init_pss(p, raidPtr) 66 RF_ReconParityStripeStatus_t *p; 67 RF_Raid_t *raidPtr; 68 { 69 RF_Calloc(p->issued, raidPtr->numCol, sizeof(char), (char *)); 70 if (p->issued == NULL) 71 return (ENOMEM); 72 return (0); 73 } 74 75 static void 76 clean_pss(p, raidPtr) 77 RF_ReconParityStripeStatus_t *p; 78 RF_Raid_t *raidPtr; 79 { 80 RF_Free(p->issued, raidPtr->numCol * sizeof(char)); 81 } 82 83 static void 84 rf_ShutdownPSStatus(arg) 85 void *arg; 86 { 87 RF_Raid_t *raidPtr = (RF_Raid_t *) arg; 88 89 RF_FREELIST_DESTROY_CLEAN_ARG(raidPtr->pss_freelist, next, (RF_ReconParityStripeStatus_t *), clean_pss, raidPtr); 90 } 91 92 int 93 rf_ConfigurePSStatus( 94 RF_ShutdownList_t ** listp, 95 RF_Raid_t * raidPtr, 96 RF_Config_t * cfgPtr) 97 { 98 int rc; 99 100 raidPtr->pssTableSize = RF_PSS_DEFAULT_TABLESIZE; 101 RF_FREELIST_CREATE(raidPtr->pss_freelist, RF_MAX_FREE_PSS, 102 RF_PSS_INC, sizeof(RF_ReconParityStripeStatus_t)); 103 if (raidPtr->pss_freelist == NULL) 104 return (ENOMEM); 105 rc = rf_ShutdownCreate(listp, rf_ShutdownPSStatus, raidPtr); 106 if (rc) { 107 RF_ERRORMSG3("Unable to add to shutdown list file %s line %d rc=%d\n", 108 __FILE__, __LINE__, rc); 109 rf_ShutdownPSStatus(raidPtr); 110 return (rc); 111 } 112 RF_FREELIST_PRIME_INIT_ARG(raidPtr->pss_freelist, RF_PSS_INITIAL, next, 113 (RF_ReconParityStripeStatus_t *), init_pss, raidPtr); 114 return (0); 115 } 116 /***************************************************************************************** 117 * sets up the pss table 118 * We pre-allocate a bunch of entries to avoid as much as possible having to 119 * malloc up hash chain entries. 120 ****************************************************************************************/ 121 RF_PSStatusHeader_t * 122 rf_MakeParityStripeStatusTable(raidPtr) 123 RF_Raid_t *raidPtr; 124 { 125 RF_PSStatusHeader_t *pssTable; 126 int i, j, rc; 127 128 RF_Calloc(pssTable, raidPtr->pssTableSize, sizeof(RF_PSStatusHeader_t), (RF_PSStatusHeader_t *)); 129 for (i = 0; i < raidPtr->pssTableSize; i++) { 130 rc = rf_mutex_init(&pssTable[i].mutex); 131 if (rc) { 132 RF_ERRORMSG3("Unable to init mutex file %s line %d rc=%d\n", __FILE__, 133 __LINE__, rc); 134 /* fail and deallocate */ 135 for (j = 0; j < i; j++) { 136 rf_mutex_destroy(&pssTable[i].mutex); 137 } 138 RF_Free(pssTable, raidPtr->pssTableSize * sizeof(RF_PSStatusHeader_t)); 139 return (NULL); 140 } 141 } 142 return (pssTable); 143 } 144 145 void 146 rf_FreeParityStripeStatusTable(raidPtr, pssTable) 147 RF_Raid_t *raidPtr; 148 RF_PSStatusHeader_t *pssTable; 149 { 150 int i; 151 152 if (rf_pssDebug) 153 RealPrintPSStatusTable(raidPtr, pssTable); 154 for (i = 0; i < raidPtr->pssTableSize; i++) { 155 if (pssTable[i].chain) { 156 printf("ERROR: pss hash chain not null at recon shutdown\n"); 157 } 158 rf_mutex_destroy(&pssTable[i].mutex); 159 } 160 RF_Free(pssTable, raidPtr->pssTableSize * sizeof(RF_PSStatusHeader_t)); 161 } 162 163 164 /* looks up the status structure for a parity stripe. 165 * if the create_flag is on, creates and returns the status structure it it doesn't exist 166 * otherwise returns NULL if the status structure does not exist 167 * 168 * ASSUMES THE PSS DESCRIPTOR IS LOCKED UPON ENTRY 169 */ 170 RF_ReconParityStripeStatus_t * 171 rf_LookupRUStatus( 172 RF_Raid_t * raidPtr, 173 RF_PSStatusHeader_t * pssTable, 174 RF_StripeNum_t psID, 175 RF_ReconUnitNum_t which_ru, 176 RF_PSSFlags_t flags, /* whether or not to create it if it doesn't 177 * exist + what flags to set initially */ 178 int *created) 179 { 180 RF_PSStatusHeader_t *hdr = &pssTable[RF_HASH_PSID(raidPtr, psID)]; 181 RF_ReconParityStripeStatus_t *p, *pssPtr = hdr->chain; 182 183 *created = 0; 184 for (p = pssPtr; p; p = p->next) { 185 if (p->parityStripeID == psID && p->which_ru == which_ru) 186 break; 187 } 188 189 if (!p && (flags & RF_PSS_CREATE)) { 190 Dprintf2("PSS: creating pss for psid %ld ru %d\n", psID, which_ru); 191 p = rf_AllocPSStatus(raidPtr); 192 p->next = hdr->chain; 193 hdr->chain = p; 194 195 p->parityStripeID = psID; 196 p->which_ru = which_ru; 197 p->flags = flags; 198 p->rbuf = NULL; 199 p->writeRbuf = NULL; 200 p->blockCount = 0; 201 p->procWaitList = NULL; 202 p->blockWaitList = NULL; 203 p->bufWaitList = NULL; 204 *created = 1; 205 } else 206 if (p) { /* we didn't create, but we want to specify 207 * some new status */ 208 p->flags |= flags; /* add in whatever flags we're 209 * specifying */ 210 } 211 if (p && (flags & RF_PSS_RECON_BLOCKED)) { 212 p->blockCount++;/* if we're asking to block recon, bump the 213 * count */ 214 Dprintf3("raid%d: Blocked recon on psid %ld. count now %d\n", 215 raidPtr->raidid, psID, p->blockCount); 216 } 217 return (p); 218 } 219 /* deletes an entry from the parity stripe status table. typically used 220 * when an entry has been allocated solely to block reconstruction, and 221 * no recon was requested while recon was blocked. Assumes the hash 222 * chain is ALREADY LOCKED. 223 */ 224 void 225 rf_PSStatusDelete(raidPtr, pssTable, pssPtr) 226 RF_Raid_t *raidPtr; 227 RF_PSStatusHeader_t *pssTable; 228 RF_ReconParityStripeStatus_t *pssPtr; 229 { 230 RF_PSStatusHeader_t *hdr = &(pssTable[RF_HASH_PSID(raidPtr, pssPtr->parityStripeID)]); 231 RF_ReconParityStripeStatus_t *p = hdr->chain, *pt = NULL; 232 233 while (p) { 234 if (p == pssPtr) { 235 if (pt) 236 pt->next = p->next; 237 else 238 hdr->chain = p->next; 239 p->next = NULL; 240 rf_FreePSStatus(raidPtr, p); 241 return; 242 } 243 pt = p; 244 p = p->next; 245 } 246 RF_ASSERT(0); /* we must find it here */ 247 } 248 /* deletes an entry from the ps status table after reconstruction has completed */ 249 void 250 rf_RemoveFromActiveReconTable(raidPtr, row, psid, which_ru) 251 RF_Raid_t *raidPtr; 252 RF_RowCol_t row; 253 RF_ReconUnitNum_t which_ru; 254 RF_StripeNum_t psid; 255 { 256 RF_PSStatusHeader_t *hdr = &(raidPtr->reconControl[row]->pssTable[RF_HASH_PSID(raidPtr, psid)]); 257 RF_ReconParityStripeStatus_t *p, *pt; 258 RF_CallbackDesc_t *cb, *cb1; 259 260 RF_LOCK_MUTEX(hdr->mutex); 261 for (pt = NULL, p = hdr->chain; p; pt = p, p = p->next) { 262 if ((p->parityStripeID == psid) && (p->which_ru == which_ru)) 263 break; 264 } 265 if (p == NULL) { 266 rf_PrintPSStatusTable(raidPtr, row); 267 } 268 RF_ASSERT(p); /* it must be there */ 269 270 Dprintf2("PSS: deleting pss for psid %ld ru %d\n", psid, which_ru); 271 272 /* delete this entry from the hash chain */ 273 if (pt) 274 pt->next = p->next; 275 else 276 hdr->chain = p->next; 277 p->next = NULL; 278 279 RF_UNLOCK_MUTEX(hdr->mutex); 280 281 /* wakup anyone waiting on the parity stripe ID */ 282 cb = p->procWaitList; 283 p->procWaitList = NULL; 284 while (cb) { 285 Dprintf1("Waking up access waiting on parity stripe ID %ld\n", p->parityStripeID); 286 cb1 = cb->next; 287 (cb->callbackFunc) (cb->callbackArg); 288 289 /* THIS IS WHAT THE ORIGINAL CODE HAD... the extra 0 is bogus, 290 * IMHO */ 291 /* (cb->callbackFunc)(cb->callbackArg, 0); */ 292 rf_FreeCallbackDesc(cb); 293 cb = cb1; 294 } 295 296 rf_FreePSStatus(raidPtr, p); 297 } 298 299 RF_ReconParityStripeStatus_t * 300 rf_AllocPSStatus(raidPtr) 301 RF_Raid_t *raidPtr; 302 { 303 RF_ReconParityStripeStatus_t *p; 304 305 RF_FREELIST_GET_INIT_ARG(raidPtr->pss_freelist, p, next, (RF_ReconParityStripeStatus_t *), init_pss, raidPtr); 306 if (p) { 307 memset(p->issued, 0, raidPtr->numCol); 308 } 309 p->next = NULL; 310 /* no need to initialize here b/c the only place we're called from is 311 * the above Lookup */ 312 return (p); 313 } 314 315 void 316 rf_FreePSStatus(raidPtr, p) 317 RF_Raid_t *raidPtr; 318 RF_ReconParityStripeStatus_t *p; 319 { 320 RF_ASSERT(p->procWaitList == NULL); 321 RF_ASSERT(p->blockWaitList == NULL); 322 RF_ASSERT(p->bufWaitList == NULL); 323 324 RF_FREELIST_FREE_CLEAN_ARG(raidPtr->pss_freelist, p, next, clean_pss, raidPtr); 325 } 326 327 static void 328 RealPrintPSStatusTable(raidPtr, pssTable) 329 RF_Raid_t *raidPtr; 330 RF_PSStatusHeader_t *pssTable; 331 { 332 int i, j, procsWaiting, blocksWaiting, bufsWaiting; 333 RF_ReconParityStripeStatus_t *p; 334 RF_CallbackDesc_t *cb; 335 336 printf("\nParity Stripe Status Table\n"); 337 for (i = 0; i < raidPtr->pssTableSize; i++) { 338 for (p = pssTable[i].chain; p; p = p->next) { 339 procsWaiting = blocksWaiting = bufsWaiting = 0; 340 for (cb = p->procWaitList; cb; cb = cb->next) 341 procsWaiting++; 342 for (cb = p->blockWaitList; cb; cb = cb->next) 343 blocksWaiting++; 344 for (cb = p->bufWaitList; cb; cb = cb->next) 345 bufsWaiting++; 346 printf("PSID %ld RU %d : blockCount %d %d/%d/%d proc/block/buf waiting, issued ", 347 (long) p->parityStripeID, p->which_ru, p->blockCount, procsWaiting, blocksWaiting, bufsWaiting); 348 for (j = 0; j < raidPtr->numCol; j++) 349 printf("%c", (p->issued[j]) ? '1' : '0'); 350 if (!p->flags) 351 printf(" flags: (none)"); 352 else { 353 if (p->flags & RF_PSS_UNDER_RECON) 354 printf(" under-recon"); 355 if (p->flags & RF_PSS_FORCED_ON_WRITE) 356 printf(" forced-w"); 357 if (p->flags & RF_PSS_FORCED_ON_READ) 358 printf(" forced-r"); 359 if (p->flags & RF_PSS_RECON_BLOCKED) 360 printf(" blocked"); 361 if (p->flags & RF_PSS_BUFFERWAIT) 362 printf(" bufwait"); 363 } 364 printf("\n"); 365 } 366 } 367 } 368 369 void 370 rf_PrintPSStatusTable(raidPtr, row) 371 RF_Raid_t *raidPtr; 372 RF_RowCol_t row; 373 { 374 RF_PSStatusHeader_t *pssTable = raidPtr->reconControl[row]->pssTable; 375 RealPrintPSStatusTable(raidPtr, pssTable); 376 } 377