1 /* $NetBSD: rf_psstatus.c,v 1.9 2002/09/14 17:53:58 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 1.9 2002/09/14 17:53:58 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 #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_print_unable_to_add_shutdown(__FILE__, __LINE__, rc); 111 rf_ShutdownPSStatus(raidPtr); 112 return (rc); 113 } 114 RF_FREELIST_PRIME_INIT_ARG(raidPtr->pss_freelist, RF_PSS_INITIAL, next, 115 (RF_ReconParityStripeStatus_t *), init_pss, raidPtr); 116 return (0); 117 } 118 /***************************************************************************************** 119 * sets up the pss table 120 * We pre-allocate a bunch of entries to avoid as much as possible having to 121 * malloc up hash chain entries. 122 ****************************************************************************************/ 123 RF_PSStatusHeader_t * 124 rf_MakeParityStripeStatusTable(raidPtr) 125 RF_Raid_t *raidPtr; 126 { 127 RF_PSStatusHeader_t *pssTable; 128 int i, j, rc; 129 130 RF_Calloc(pssTable, raidPtr->pssTableSize, sizeof(RF_PSStatusHeader_t), (RF_PSStatusHeader_t *)); 131 for (i = 0; i < raidPtr->pssTableSize; i++) { 132 rc = rf_mutex_init(&pssTable[i].mutex); 133 if (rc) { 134 rf_print_unable_to_init_mutex(__FILE__, __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 p->blockCount++;/* if we're asking to block recon, bump the 214 * count */ 215 Dprintf3("raid%d: Blocked recon on psid %ld. count now %d\n", 216 raidPtr->raidid, psID, p->blockCount); 217 } 218 return (p); 219 } 220 /* deletes an entry from the parity stripe status table. typically used 221 * when an entry has been allocated solely to block reconstruction, and 222 * no recon was requested while recon was blocked. Assumes the hash 223 * chain is ALREADY LOCKED. 224 */ 225 void 226 rf_PSStatusDelete(raidPtr, pssTable, pssPtr) 227 RF_Raid_t *raidPtr; 228 RF_PSStatusHeader_t *pssTable; 229 RF_ReconParityStripeStatus_t *pssPtr; 230 { 231 RF_PSStatusHeader_t *hdr = &(pssTable[RF_HASH_PSID(raidPtr, pssPtr->parityStripeID)]); 232 RF_ReconParityStripeStatus_t *p = hdr->chain, *pt = NULL; 233 234 while (p) { 235 if (p == pssPtr) { 236 if (pt) 237 pt->next = p->next; 238 else 239 hdr->chain = p->next; 240 p->next = NULL; 241 rf_FreePSStatus(raidPtr, p); 242 return; 243 } 244 pt = p; 245 p = p->next; 246 } 247 RF_ASSERT(0); /* we must find it here */ 248 } 249 /* deletes an entry from the ps status table after reconstruction has completed */ 250 void 251 rf_RemoveFromActiveReconTable(raidPtr, row, psid, which_ru) 252 RF_Raid_t *raidPtr; 253 RF_RowCol_t row; 254 RF_ReconUnitNum_t which_ru; 255 RF_StripeNum_t psid; 256 { 257 RF_PSStatusHeader_t *hdr = &(raidPtr->reconControl[row]->pssTable[RF_HASH_PSID(raidPtr, psid)]); 258 RF_ReconParityStripeStatus_t *p, *pt; 259 RF_CallbackDesc_t *cb, *cb1; 260 261 RF_LOCK_MUTEX(hdr->mutex); 262 for (pt = NULL, p = hdr->chain; p; pt = p, p = p->next) { 263 if ((p->parityStripeID == psid) && (p->which_ru == which_ru)) 264 break; 265 } 266 if (p == NULL) { 267 rf_PrintPSStatusTable(raidPtr, row); 268 } 269 RF_ASSERT(p); /* it must be there */ 270 271 Dprintf2("PSS: deleting pss for psid %ld ru %d\n", psid, which_ru); 272 273 /* delete this entry from the hash chain */ 274 if (pt) 275 pt->next = p->next; 276 else 277 hdr->chain = p->next; 278 p->next = NULL; 279 280 RF_UNLOCK_MUTEX(hdr->mutex); 281 282 /* wakup anyone waiting on the parity stripe ID */ 283 cb = p->procWaitList; 284 p->procWaitList = NULL; 285 while (cb) { 286 Dprintf1("Waking up access waiting on parity stripe ID %ld\n", p->parityStripeID); 287 cb1 = cb->next; 288 (cb->callbackFunc) (cb->callbackArg); 289 290 /* THIS IS WHAT THE ORIGINAL CODE HAD... the extra 0 is bogus, 291 * IMHO */ 292 /* (cb->callbackFunc)(cb->callbackArg, 0); */ 293 rf_FreeCallbackDesc(cb); 294 cb = cb1; 295 } 296 297 rf_FreePSStatus(raidPtr, p); 298 } 299 300 RF_ReconParityStripeStatus_t * 301 rf_AllocPSStatus(raidPtr) 302 RF_Raid_t *raidPtr; 303 { 304 RF_ReconParityStripeStatus_t *p; 305 306 RF_FREELIST_GET_INIT_ARG(raidPtr->pss_freelist, p, next, (RF_ReconParityStripeStatus_t *), init_pss, raidPtr); 307 if (p) { 308 memset(p->issued, 0, raidPtr->numCol); 309 } 310 p->next = NULL; 311 /* no need to initialize here b/c the only place we're called from is 312 * the above Lookup */ 313 return (p); 314 } 315 316 void 317 rf_FreePSStatus(raidPtr, p) 318 RF_Raid_t *raidPtr; 319 RF_ReconParityStripeStatus_t *p; 320 { 321 RF_ASSERT(p->procWaitList == NULL); 322 RF_ASSERT(p->blockWaitList == NULL); 323 RF_ASSERT(p->bufWaitList == NULL); 324 325 RF_FREELIST_FREE_CLEAN_ARG(raidPtr->pss_freelist, p, next, clean_pss, raidPtr); 326 } 327 328 static void 329 RealPrintPSStatusTable(raidPtr, pssTable) 330 RF_Raid_t *raidPtr; 331 RF_PSStatusHeader_t *pssTable; 332 { 333 int i, j, procsWaiting, blocksWaiting, bufsWaiting; 334 RF_ReconParityStripeStatus_t *p; 335 RF_CallbackDesc_t *cb; 336 337 printf("\nParity Stripe Status Table\n"); 338 for (i = 0; i < raidPtr->pssTableSize; i++) { 339 for (p = pssTable[i].chain; p; p = p->next) { 340 procsWaiting = blocksWaiting = bufsWaiting = 0; 341 for (cb = p->procWaitList; cb; cb = cb->next) 342 procsWaiting++; 343 for (cb = p->blockWaitList; cb; cb = cb->next) 344 blocksWaiting++; 345 for (cb = p->bufWaitList; cb; cb = cb->next) 346 bufsWaiting++; 347 printf("PSID %ld RU %d : blockCount %d %d/%d/%d proc/block/buf waiting, issued ", 348 (long) p->parityStripeID, p->which_ru, p->blockCount, procsWaiting, blocksWaiting, bufsWaiting); 349 for (j = 0; j < raidPtr->numCol; j++) 350 printf("%c", (p->issued[j]) ? '1' : '0'); 351 if (!p->flags) 352 printf(" flags: (none)"); 353 else { 354 if (p->flags & RF_PSS_UNDER_RECON) 355 printf(" under-recon"); 356 if (p->flags & RF_PSS_FORCED_ON_WRITE) 357 printf(" forced-w"); 358 if (p->flags & RF_PSS_FORCED_ON_READ) 359 printf(" forced-r"); 360 if (p->flags & RF_PSS_RECON_BLOCKED) 361 printf(" blocked"); 362 if (p->flags & RF_PSS_BUFFERWAIT) 363 printf(" bufwait"); 364 } 365 printf("\n"); 366 } 367 } 368 } 369 370 void 371 rf_PrintPSStatusTable(raidPtr, row) 372 RF_Raid_t *raidPtr; 373 RF_RowCol_t row; 374 { 375 RF_PSStatusHeader_t *pssTable = raidPtr->reconControl[row]->pssTable; 376 RealPrintPSStatusTable(raidPtr, pssTable); 377 } 378