1 /* $NetBSD: rf_psstatus.c,v 1.11 2002/10/11 02:10:09 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 <sys/cdefs.h> 40 __KERNEL_RCSID(0, "$NetBSD: rf_psstatus.c,v 1.11 2002/10/11 02:10:09 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 void rf_ShutdownPSStatus(void *); 70 71 static void 72 rf_ShutdownPSStatus(arg) 73 void *arg; 74 { 75 RF_Raid_t *raidPtr = (RF_Raid_t *) arg; 76 77 pool_destroy(&raidPtr->pss_pool); 78 pool_destroy(&raidPtr->pss_issued_pool); 79 } 80 81 int 82 rf_ConfigurePSStatus( 83 RF_ShutdownList_t ** listp, 84 RF_Raid_t * raidPtr, 85 RF_Config_t * cfgPtr) 86 { 87 int rc; 88 89 raidPtr->pssTableSize = RF_PSS_DEFAULT_TABLESIZE; 90 pool_init(&raidPtr->pss_pool, sizeof(RF_ReconParityStripeStatus_t), 0, 91 0, RF_PSS_INITIAL, "raidpsspl", NULL); 92 pool_init(&raidPtr->pss_issued_pool, 93 raidPtr->numCol * sizeof(char), 0, 94 0, RF_PSS_INITIAL, "raidpssissuedpl", NULL); 95 rc = rf_ShutdownCreate(listp, rf_ShutdownPSStatus, raidPtr); 96 if (rc) { 97 rf_print_unable_to_add_shutdown(__FILE__, __LINE__, rc); 98 rf_ShutdownPSStatus(raidPtr); 99 return (rc); 100 } 101 pool_sethiwat(&raidPtr->pss_pool, RF_MAX_FREE_PSS); 102 pool_sethiwat(&raidPtr->pss_issued_pool, RF_MAX_FREE_PSS); 103 104 return (0); 105 } 106 /***************************************************************************************** 107 * sets up the pss table 108 * We pre-allocate a bunch of entries to avoid as much as possible having to 109 * malloc up hash chain entries. 110 ****************************************************************************************/ 111 RF_PSStatusHeader_t * 112 rf_MakeParityStripeStatusTable(raidPtr) 113 RF_Raid_t *raidPtr; 114 { 115 RF_PSStatusHeader_t *pssTable; 116 int i, j, rc; 117 118 RF_Calloc(pssTable, raidPtr->pssTableSize, sizeof(RF_PSStatusHeader_t), (RF_PSStatusHeader_t *)); 119 for (i = 0; i < raidPtr->pssTableSize; i++) { 120 rc = rf_mutex_init(&pssTable[i].mutex); 121 if (rc) { 122 rf_print_unable_to_init_mutex(__FILE__, __LINE__, rc); 123 /* fail and deallocate */ 124 for (j = 0; j < i; j++) { 125 rf_mutex_destroy(&pssTable[i].mutex); 126 } 127 RF_Free(pssTable, raidPtr->pssTableSize * sizeof(RF_PSStatusHeader_t)); 128 return (NULL); 129 } 130 } 131 return (pssTable); 132 } 133 134 void 135 rf_FreeParityStripeStatusTable(raidPtr, pssTable) 136 RF_Raid_t *raidPtr; 137 RF_PSStatusHeader_t *pssTable; 138 { 139 int i; 140 141 #if RF_DEBUG_PSS 142 if (rf_pssDebug) 143 RealPrintPSStatusTable(raidPtr, pssTable); 144 #endif 145 for (i = 0; i < raidPtr->pssTableSize; i++) { 146 if (pssTable[i].chain) { 147 printf("ERROR: pss hash chain not null at recon shutdown\n"); 148 } 149 rf_mutex_destroy(&pssTable[i].mutex); 150 } 151 RF_Free(pssTable, raidPtr->pssTableSize * sizeof(RF_PSStatusHeader_t)); 152 } 153 154 155 /* looks up the status structure for a parity stripe. 156 * if the create_flag is on, creates and returns the status structure it it doesn't exist 157 * otherwise returns NULL if the status structure does not exist 158 * 159 * ASSUMES THE PSS DESCRIPTOR IS LOCKED UPON ENTRY 160 */ 161 RF_ReconParityStripeStatus_t * 162 rf_LookupRUStatus( 163 RF_Raid_t * raidPtr, 164 RF_PSStatusHeader_t * pssTable, 165 RF_StripeNum_t psID, 166 RF_ReconUnitNum_t which_ru, 167 RF_PSSFlags_t flags, /* whether or not to create it if it doesn't 168 * exist + what flags to set initially */ 169 int *created) 170 { 171 RF_PSStatusHeader_t *hdr = &pssTable[RF_HASH_PSID(raidPtr, psID)]; 172 RF_ReconParityStripeStatus_t *p, *pssPtr = hdr->chain; 173 174 *created = 0; 175 for (p = pssPtr; p; p = p->next) { 176 if (p->parityStripeID == psID && p->which_ru == which_ru) 177 break; 178 } 179 180 if (!p && (flags & RF_PSS_CREATE)) { 181 Dprintf2("PSS: creating pss for psid %ld ru %d\n", psID, which_ru); 182 p = rf_AllocPSStatus(raidPtr); 183 p->next = hdr->chain; 184 hdr->chain = p; 185 186 p->parityStripeID = psID; 187 p->which_ru = which_ru; 188 p->flags = flags; 189 p->rbuf = NULL; 190 p->writeRbuf = NULL; 191 p->blockCount = 0; 192 p->procWaitList = NULL; 193 p->blockWaitList = NULL; 194 p->bufWaitList = NULL; 195 *created = 1; 196 } else 197 if (p) { /* we didn't create, but we want to specify 198 * some new status */ 199 p->flags |= flags; /* add in whatever flags we're 200 * specifying */ 201 } 202 if (p && (flags & RF_PSS_RECON_BLOCKED)) { 203 p->blockCount++;/* if we're asking to block recon, bump the 204 * count */ 205 Dprintf3("raid%d: Blocked recon on psid %ld. count now %d\n", 206 raidPtr->raidid, psID, p->blockCount); 207 } 208 return (p); 209 } 210 /* deletes an entry from the parity stripe status table. typically used 211 * when an entry has been allocated solely to block reconstruction, and 212 * no recon was requested while recon was blocked. Assumes the hash 213 * chain is ALREADY LOCKED. 214 */ 215 void 216 rf_PSStatusDelete(raidPtr, pssTable, pssPtr) 217 RF_Raid_t *raidPtr; 218 RF_PSStatusHeader_t *pssTable; 219 RF_ReconParityStripeStatus_t *pssPtr; 220 { 221 RF_PSStatusHeader_t *hdr = &(pssTable[RF_HASH_PSID(raidPtr, pssPtr->parityStripeID)]); 222 RF_ReconParityStripeStatus_t *p = hdr->chain, *pt = NULL; 223 224 while (p) { 225 if (p == pssPtr) { 226 if (pt) 227 pt->next = p->next; 228 else 229 hdr->chain = p->next; 230 p->next = NULL; 231 rf_FreePSStatus(raidPtr, p); 232 return; 233 } 234 pt = p; 235 p = p->next; 236 } 237 RF_ASSERT(0); /* we must find it here */ 238 } 239 /* deletes an entry from the ps status table after reconstruction has completed */ 240 void 241 rf_RemoveFromActiveReconTable(raidPtr, row, psid, which_ru) 242 RF_Raid_t *raidPtr; 243 RF_RowCol_t row; 244 RF_ReconUnitNum_t which_ru; 245 RF_StripeNum_t psid; 246 { 247 RF_PSStatusHeader_t *hdr = &(raidPtr->reconControl[row]->pssTable[RF_HASH_PSID(raidPtr, psid)]); 248 RF_ReconParityStripeStatus_t *p, *pt; 249 RF_CallbackDesc_t *cb, *cb1; 250 251 RF_LOCK_MUTEX(hdr->mutex); 252 for (pt = NULL, p = hdr->chain; p; pt = p, p = p->next) { 253 if ((p->parityStripeID == psid) && (p->which_ru == which_ru)) 254 break; 255 } 256 if (p == NULL) { 257 rf_PrintPSStatusTable(raidPtr, row); 258 } 259 RF_ASSERT(p); /* it must be there */ 260 261 Dprintf2("PSS: deleting pss for psid %ld ru %d\n", psid, which_ru); 262 263 /* delete this entry from the hash chain */ 264 if (pt) 265 pt->next = p->next; 266 else 267 hdr->chain = p->next; 268 p->next = NULL; 269 270 RF_UNLOCK_MUTEX(hdr->mutex); 271 272 /* wakup anyone waiting on the parity stripe ID */ 273 cb = p->procWaitList; 274 p->procWaitList = NULL; 275 while (cb) { 276 Dprintf1("Waking up access waiting on parity stripe ID %ld\n", p->parityStripeID); 277 cb1 = cb->next; 278 (cb->callbackFunc) (cb->callbackArg); 279 280 /* THIS IS WHAT THE ORIGINAL CODE HAD... the extra 0 is bogus, 281 * IMHO */ 282 /* (cb->callbackFunc)(cb->callbackArg, 0); */ 283 rf_FreeCallbackDesc(cb); 284 cb = cb1; 285 } 286 287 rf_FreePSStatus(raidPtr, p); 288 } 289 290 RF_ReconParityStripeStatus_t * 291 rf_AllocPSStatus(raidPtr) 292 RF_Raid_t *raidPtr; 293 { 294 RF_ReconParityStripeStatus_t *p; 295 296 p = pool_get(&raidPtr->pss_pool, PR_NOWAIT); 297 p->issued = pool_get(&raidPtr->pss_issued_pool, PR_NOWAIT); 298 memset(p->issued, 0, raidPtr->numCol); 299 p->next = NULL; 300 /* no need to initialize here b/c the only place we're called from is 301 * the above Lookup */ 302 return (p); 303 } 304 305 void 306 rf_FreePSStatus(raidPtr, p) 307 RF_Raid_t *raidPtr; 308 RF_ReconParityStripeStatus_t *p; 309 { 310 RF_ASSERT(p->procWaitList == NULL); 311 RF_ASSERT(p->blockWaitList == NULL); 312 RF_ASSERT(p->bufWaitList == NULL); 313 314 pool_put(&raidPtr->pss_issued_pool, p->issued); 315 pool_put(&raidPtr->pss_pool, p); 316 } 317 318 static void 319 RealPrintPSStatusTable(raidPtr, pssTable) 320 RF_Raid_t *raidPtr; 321 RF_PSStatusHeader_t *pssTable; 322 { 323 int i, j, procsWaiting, blocksWaiting, bufsWaiting; 324 RF_ReconParityStripeStatus_t *p; 325 RF_CallbackDesc_t *cb; 326 327 printf("\nParity Stripe Status Table\n"); 328 for (i = 0; i < raidPtr->pssTableSize; i++) { 329 for (p = pssTable[i].chain; p; p = p->next) { 330 procsWaiting = blocksWaiting = bufsWaiting = 0; 331 for (cb = p->procWaitList; cb; cb = cb->next) 332 procsWaiting++; 333 for (cb = p->blockWaitList; cb; cb = cb->next) 334 blocksWaiting++; 335 for (cb = p->bufWaitList; cb; cb = cb->next) 336 bufsWaiting++; 337 printf("PSID %ld RU %d : blockCount %d %d/%d/%d proc/block/buf waiting, issued ", 338 (long) p->parityStripeID, p->which_ru, p->blockCount, procsWaiting, blocksWaiting, bufsWaiting); 339 for (j = 0; j < raidPtr->numCol; j++) 340 printf("%c", (p->issued[j]) ? '1' : '0'); 341 if (!p->flags) 342 printf(" flags: (none)"); 343 else { 344 if (p->flags & RF_PSS_UNDER_RECON) 345 printf(" under-recon"); 346 if (p->flags & RF_PSS_FORCED_ON_WRITE) 347 printf(" forced-w"); 348 if (p->flags & RF_PSS_FORCED_ON_READ) 349 printf(" forced-r"); 350 if (p->flags & RF_PSS_RECON_BLOCKED) 351 printf(" blocked"); 352 if (p->flags & RF_PSS_BUFFERWAIT) 353 printf(" bufwait"); 354 } 355 printf("\n"); 356 } 357 } 358 } 359 360 void 361 rf_PrintPSStatusTable(raidPtr, row) 362 RF_Raid_t *raidPtr; 363 RF_RowCol_t row; 364 { 365 RF_PSStatusHeader_t *pssTable = raidPtr->reconControl[row]->pssTable; 366 RealPrintPSStatusTable(raidPtr, pssTable); 367 } 368