1 /* $NetBSD: rf_psstatus.c,v 1.8 2001/11/13 07:11:16 lukem 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 1.8 2001/11/13 07:11:16 lukem 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 #define Dprintf1(s,a) if (rf_pssDebug) rf_debug_printf(s,(void *)((unsigned long)a),NULL,NULL,NULL,NULL,NULL,NULL,NULL) 52 #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) 53 #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) 54 55 static void 56 RealPrintPSStatusTable(RF_Raid_t * raidPtr, 57 RF_PSStatusHeader_t * pssTable); 58 59 #define RF_MAX_FREE_PSS 32 60 #define RF_PSS_INC 8 61 #define RF_PSS_INITIAL 4 62 63 static int init_pss(RF_ReconParityStripeStatus_t *, RF_Raid_t *); 64 static void clean_pss(RF_ReconParityStripeStatus_t *, RF_Raid_t *); 65 static void rf_ShutdownPSStatus(void *); 66 67 static int 68 init_pss(p, raidPtr) 69 RF_ReconParityStripeStatus_t *p; 70 RF_Raid_t *raidPtr; 71 { 72 RF_Calloc(p->issued, raidPtr->numCol, sizeof(char), (char *)); 73 if (p->issued == NULL) 74 return (ENOMEM); 75 return (0); 76 } 77 78 static void 79 clean_pss(p, raidPtr) 80 RF_ReconParityStripeStatus_t *p; 81 RF_Raid_t *raidPtr; 82 { 83 RF_Free(p->issued, raidPtr->numCol * sizeof(char)); 84 } 85 86 static void 87 rf_ShutdownPSStatus(arg) 88 void *arg; 89 { 90 RF_Raid_t *raidPtr = (RF_Raid_t *) arg; 91 92 RF_FREELIST_DESTROY_CLEAN_ARG(raidPtr->pss_freelist, next, (RF_ReconParityStripeStatus_t *), clean_pss, raidPtr); 93 } 94 95 int 96 rf_ConfigurePSStatus( 97 RF_ShutdownList_t ** listp, 98 RF_Raid_t * raidPtr, 99 RF_Config_t * cfgPtr) 100 { 101 int rc; 102 103 raidPtr->pssTableSize = RF_PSS_DEFAULT_TABLESIZE; 104 RF_FREELIST_CREATE(raidPtr->pss_freelist, RF_MAX_FREE_PSS, 105 RF_PSS_INC, sizeof(RF_ReconParityStripeStatus_t)); 106 if (raidPtr->pss_freelist == NULL) 107 return (ENOMEM); 108 rc = rf_ShutdownCreate(listp, rf_ShutdownPSStatus, raidPtr); 109 if (rc) { 110 RF_ERRORMSG3("Unable to add to shutdown list file %s line %d rc=%d\n", 111 __FILE__, __LINE__, rc); 112 rf_ShutdownPSStatus(raidPtr); 113 return (rc); 114 } 115 RF_FREELIST_PRIME_INIT_ARG(raidPtr->pss_freelist, RF_PSS_INITIAL, next, 116 (RF_ReconParityStripeStatus_t *), init_pss, raidPtr); 117 return (0); 118 } 119 /***************************************************************************************** 120 * sets up the pss table 121 * We pre-allocate a bunch of entries to avoid as much as possible having to 122 * malloc up hash chain entries. 123 ****************************************************************************************/ 124 RF_PSStatusHeader_t * 125 rf_MakeParityStripeStatusTable(raidPtr) 126 RF_Raid_t *raidPtr; 127 { 128 RF_PSStatusHeader_t *pssTable; 129 int i, j, rc; 130 131 RF_Calloc(pssTable, raidPtr->pssTableSize, sizeof(RF_PSStatusHeader_t), (RF_PSStatusHeader_t *)); 132 for (i = 0; i < raidPtr->pssTableSize; i++) { 133 rc = rf_mutex_init(&pssTable[i].mutex); 134 if (rc) { 135 RF_ERRORMSG3("Unable to init mutex file %s line %d rc=%d\n", __FILE__, 136 __LINE__, rc); 137 /* fail and deallocate */ 138 for (j = 0; j < i; j++) { 139 rf_mutex_destroy(&pssTable[i].mutex); 140 } 141 RF_Free(pssTable, raidPtr->pssTableSize * sizeof(RF_PSStatusHeader_t)); 142 return (NULL); 143 } 144 } 145 return (pssTable); 146 } 147 148 void 149 rf_FreeParityStripeStatusTable(raidPtr, pssTable) 150 RF_Raid_t *raidPtr; 151 RF_PSStatusHeader_t *pssTable; 152 { 153 int i; 154 155 if (rf_pssDebug) 156 RealPrintPSStatusTable(raidPtr, pssTable); 157 for (i = 0; i < raidPtr->pssTableSize; i++) { 158 if (pssTable[i].chain) { 159 printf("ERROR: pss hash chain not null at recon shutdown\n"); 160 } 161 rf_mutex_destroy(&pssTable[i].mutex); 162 } 163 RF_Free(pssTable, raidPtr->pssTableSize * sizeof(RF_PSStatusHeader_t)); 164 } 165 166 167 /* looks up the status structure for a parity stripe. 168 * if the create_flag is on, creates and returns the status structure it it doesn't exist 169 * otherwise returns NULL if the status structure does not exist 170 * 171 * ASSUMES THE PSS DESCRIPTOR IS LOCKED UPON ENTRY 172 */ 173 RF_ReconParityStripeStatus_t * 174 rf_LookupRUStatus( 175 RF_Raid_t * raidPtr, 176 RF_PSStatusHeader_t * pssTable, 177 RF_StripeNum_t psID, 178 RF_ReconUnitNum_t which_ru, 179 RF_PSSFlags_t flags, /* whether or not to create it if it doesn't 180 * exist + what flags to set initially */ 181 int *created) 182 { 183 RF_PSStatusHeader_t *hdr = &pssTable[RF_HASH_PSID(raidPtr, psID)]; 184 RF_ReconParityStripeStatus_t *p, *pssPtr = hdr->chain; 185 186 *created = 0; 187 for (p = pssPtr; p; p = p->next) { 188 if (p->parityStripeID == psID && p->which_ru == which_ru) 189 break; 190 } 191 192 if (!p && (flags & RF_PSS_CREATE)) { 193 Dprintf2("PSS: creating pss for psid %ld ru %d\n", psID, which_ru); 194 p = rf_AllocPSStatus(raidPtr); 195 p->next = hdr->chain; 196 hdr->chain = p; 197 198 p->parityStripeID = psID; 199 p->which_ru = which_ru; 200 p->flags = flags; 201 p->rbuf = NULL; 202 p->writeRbuf = NULL; 203 p->blockCount = 0; 204 p->procWaitList = NULL; 205 p->blockWaitList = NULL; 206 p->bufWaitList = NULL; 207 *created = 1; 208 } else 209 if (p) { /* we didn't create, but we want to specify 210 * some new status */ 211 p->flags |= flags; /* add in whatever flags we're 212 * specifying */ 213 } 214 if (p && (flags & RF_PSS_RECON_BLOCKED)) { 215 p->blockCount++;/* if we're asking to block recon, bump the 216 * count */ 217 Dprintf3("raid%d: Blocked recon on psid %ld. count now %d\n", 218 raidPtr->raidid, psID, p->blockCount); 219 } 220 return (p); 221 } 222 /* deletes an entry from the parity stripe status table. typically used 223 * when an entry has been allocated solely to block reconstruction, and 224 * no recon was requested while recon was blocked. Assumes the hash 225 * chain is ALREADY LOCKED. 226 */ 227 void 228 rf_PSStatusDelete(raidPtr, pssTable, pssPtr) 229 RF_Raid_t *raidPtr; 230 RF_PSStatusHeader_t *pssTable; 231 RF_ReconParityStripeStatus_t *pssPtr; 232 { 233 RF_PSStatusHeader_t *hdr = &(pssTable[RF_HASH_PSID(raidPtr, pssPtr->parityStripeID)]); 234 RF_ReconParityStripeStatus_t *p = hdr->chain, *pt = NULL; 235 236 while (p) { 237 if (p == pssPtr) { 238 if (pt) 239 pt->next = p->next; 240 else 241 hdr->chain = p->next; 242 p->next = NULL; 243 rf_FreePSStatus(raidPtr, p); 244 return; 245 } 246 pt = p; 247 p = p->next; 248 } 249 RF_ASSERT(0); /* we must find it here */ 250 } 251 /* deletes an entry from the ps status table after reconstruction has completed */ 252 void 253 rf_RemoveFromActiveReconTable(raidPtr, row, psid, which_ru) 254 RF_Raid_t *raidPtr; 255 RF_RowCol_t row; 256 RF_ReconUnitNum_t which_ru; 257 RF_StripeNum_t psid; 258 { 259 RF_PSStatusHeader_t *hdr = &(raidPtr->reconControl[row]->pssTable[RF_HASH_PSID(raidPtr, psid)]); 260 RF_ReconParityStripeStatus_t *p, *pt; 261 RF_CallbackDesc_t *cb, *cb1; 262 263 RF_LOCK_MUTEX(hdr->mutex); 264 for (pt = NULL, p = hdr->chain; p; pt = p, p = p->next) { 265 if ((p->parityStripeID == psid) && (p->which_ru == which_ru)) 266 break; 267 } 268 if (p == NULL) { 269 rf_PrintPSStatusTable(raidPtr, row); 270 } 271 RF_ASSERT(p); /* it must be there */ 272 273 Dprintf2("PSS: deleting pss for psid %ld ru %d\n", psid, which_ru); 274 275 /* delete this entry from the hash chain */ 276 if (pt) 277 pt->next = p->next; 278 else 279 hdr->chain = p->next; 280 p->next = NULL; 281 282 RF_UNLOCK_MUTEX(hdr->mutex); 283 284 /* wakup anyone waiting on the parity stripe ID */ 285 cb = p->procWaitList; 286 p->procWaitList = NULL; 287 while (cb) { 288 Dprintf1("Waking up access waiting on parity stripe ID %ld\n", p->parityStripeID); 289 cb1 = cb->next; 290 (cb->callbackFunc) (cb->callbackArg); 291 292 /* THIS IS WHAT THE ORIGINAL CODE HAD... the extra 0 is bogus, 293 * IMHO */ 294 /* (cb->callbackFunc)(cb->callbackArg, 0); */ 295 rf_FreeCallbackDesc(cb); 296 cb = cb1; 297 } 298 299 rf_FreePSStatus(raidPtr, p); 300 } 301 302 RF_ReconParityStripeStatus_t * 303 rf_AllocPSStatus(raidPtr) 304 RF_Raid_t *raidPtr; 305 { 306 RF_ReconParityStripeStatus_t *p; 307 308 RF_FREELIST_GET_INIT_ARG(raidPtr->pss_freelist, p, next, (RF_ReconParityStripeStatus_t *), init_pss, raidPtr); 309 if (p) { 310 memset(p->issued, 0, raidPtr->numCol); 311 } 312 p->next = NULL; 313 /* no need to initialize here b/c the only place we're called from is 314 * the above Lookup */ 315 return (p); 316 } 317 318 void 319 rf_FreePSStatus(raidPtr, p) 320 RF_Raid_t *raidPtr; 321 RF_ReconParityStripeStatus_t *p; 322 { 323 RF_ASSERT(p->procWaitList == NULL); 324 RF_ASSERT(p->blockWaitList == NULL); 325 RF_ASSERT(p->bufWaitList == NULL); 326 327 RF_FREELIST_FREE_CLEAN_ARG(raidPtr->pss_freelist, p, next, clean_pss, raidPtr); 328 } 329 330 static void 331 RealPrintPSStatusTable(raidPtr, pssTable) 332 RF_Raid_t *raidPtr; 333 RF_PSStatusHeader_t *pssTable; 334 { 335 int i, j, procsWaiting, blocksWaiting, bufsWaiting; 336 RF_ReconParityStripeStatus_t *p; 337 RF_CallbackDesc_t *cb; 338 339 printf("\nParity Stripe Status Table\n"); 340 for (i = 0; i < raidPtr->pssTableSize; i++) { 341 for (p = pssTable[i].chain; p; p = p->next) { 342 procsWaiting = blocksWaiting = bufsWaiting = 0; 343 for (cb = p->procWaitList; cb; cb = cb->next) 344 procsWaiting++; 345 for (cb = p->blockWaitList; cb; cb = cb->next) 346 blocksWaiting++; 347 for (cb = p->bufWaitList; cb; cb = cb->next) 348 bufsWaiting++; 349 printf("PSID %ld RU %d : blockCount %d %d/%d/%d proc/block/buf waiting, issued ", 350 (long) p->parityStripeID, p->which_ru, p->blockCount, procsWaiting, blocksWaiting, bufsWaiting); 351 for (j = 0; j < raidPtr->numCol; j++) 352 printf("%c", (p->issued[j]) ? '1' : '0'); 353 if (!p->flags) 354 printf(" flags: (none)"); 355 else { 356 if (p->flags & RF_PSS_UNDER_RECON) 357 printf(" under-recon"); 358 if (p->flags & RF_PSS_FORCED_ON_WRITE) 359 printf(" forced-w"); 360 if (p->flags & RF_PSS_FORCED_ON_READ) 361 printf(" forced-r"); 362 if (p->flags & RF_PSS_RECON_BLOCKED) 363 printf(" blocked"); 364 if (p->flags & RF_PSS_BUFFERWAIT) 365 printf(" bufwait"); 366 } 367 printf("\n"); 368 } 369 } 370 } 371 372 void 373 rf_PrintPSStatusTable(raidPtr, row) 374 RF_Raid_t *raidPtr; 375 RF_RowCol_t row; 376 { 377 RF_PSStatusHeader_t *pssTable = raidPtr->reconControl[row]->pssTable; 378 RealPrintPSStatusTable(raidPtr, pssTable); 379 } 380