Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/dev/vinum/vinuminterrupt.c
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1 /* vinuminterrupt.c: bottom half of the driver */ 2 3 /*- 4 * Copyright (c) 1997, 1998, 1999 5 * Nan Yang Computer Services Limited. All rights reserved. 6 * 7 * Parts copyright (c) 1997, 1998 Cybernet Corporation, NetMAX project. 8 * 9 * Written by Greg Lehey 10 * 11 * This software is distributed under the so-called ``Berkeley 12 * License'': 13 * 14 * Redistribution and use in source and binary forms, with or without 15 * modification, are permitted provided that the following conditions 16 * are met: 17 * 1. Redistributions of source code must retain the above copyright 18 * notice, this list of conditions and the following disclaimer. 19 * 2. Redistributions in binary form must reproduce the above copyright 20 * notice, this list of conditions and the following disclaimer in the 21 * documentation and/or other materials provided with the distribution. 22 * 3. All advertising materials mentioning features or use of this software 23 * must display the following acknowledgement: 24 * This product includes software developed by Nan Yang Computer 25 * Services Limited. 26 * 4. Neither the name of the Company nor the names of its contributors 27 * may be used to endorse or promote products derived from this software 28 * without specific prior written permission. 29 * 30 * This software is provided ``as is'', and any express or implied 31 * warranties, including, but not limited to, the implied warranties of 32 * merchantability and fitness for a particular purpose are disclaimed. 33 * In no event shall the company or contributors be liable for any 34 * direct, indirect, incidental, special, exemplary, or consequential 35 * damages (including, but not limited to, procurement of substitute 36 * goods or services; loss of use, data, or profits; or business 37 * interruption) however caused and on any theory of liability, whether 38 * in contract, strict liability, or tort (including negligence or 39 * otherwise) arising in any way out of the use of this software, even if 40 * advised of the possibility of such damage. 41 * 42 * $Id: vinuminterrupt.c,v 1.12 2000/11/24 03:41:42 grog Exp grog $ 43 * $FreeBSD$ 44 */ 45 46 #include <dev/vinum/vinumhdr.h> 47 #include <dev/vinum/request.h> 48 #include <sys/resourcevar.h> 49 50 void complete_raid5_write(struct rqelement *); 51 void complete_rqe(struct buf *bp); 52 void sdio_done(struct buf *bp); 53 54 /* 55 * Take a completed buffer, transfer the data back if 56 * it's a read, and complete the high-level request 57 * if this is the last subrequest. 58 * 59 * The bp parameter is in fact a struct rqelement, which 60 * includes a couple of extras at the end. 61 */ 62 void 63 complete_rqe(struct buf *bp) 64 { 65 struct rqelement *rqe; 66 struct request *rq; 67 struct rqgroup *rqg; 68 struct buf *ubp; /* user buffer */ 69 struct drive *drive; 70 struct sd *sd; 71 char *gravity; /* for error messages */ 72 73 rqe = (struct rqelement *) bp; /* point to the element that completed */ 74 rqg = rqe->rqg; /* and the request group */ 75 rq = rqg->rq; /* and the complete request */ 76 ubp = rq->bp; /* user buffer */ 77 78 #ifdef VINUMDEBUG 79 if (debug & DEBUG_LASTREQS) 80 logrq(loginfo_iodone, (union rqinfou) rqe, ubp); 81 #endif 82 drive = &DRIVE[rqe->driveno]; 83 drive->active--; /* one less outstanding I/O on this drive */ 84 vinum_conf.active--; /* one less outstanding I/O globally */ 85 if ((drive->active == (DRIVE_MAXACTIVE - 1)) /* we were at the drive limit */ 86 ||(vinum_conf.active == VINUM_MAXACTIVE)) /* or the global limit */ 87 wakeup(&launch_requests); /* let another one at it */ 88 if ((bp->b_flags & B_ERROR) != 0) { /* transfer in error */ 89 gravity = ""; 90 sd = &SD[rqe->sdno]; 91 92 if (bp->b_error != 0) /* did it return a number? */ 93 rq->error = bp->b_error; /* yes, put it in. */ 94 else if (rq->error == 0) /* no: do we have one already? */ 95 rq->error = EIO; /* no: catchall "I/O error" */ 96 sd->lasterror = rq->error; 97 if (bp->b_flags & B_READ) { 98 if ((rq->error == ENXIO) || (sd->flags & VF_RETRYERRORS) == 0) { 99 gravity = " fatal"; 100 set_sd_state(rqe->sdno, sd_crashed, setstate_force); /* subdisk is crashed */ 101 } 102 log(LOG_ERR, 103 "%s:%s read error, block %d for %ld bytes\n", 104 gravity, 105 sd->name, 106 bp->b_blkno, 107 bp->b_bcount); 108 } else { /* write operation */ 109 if ((rq->error == ENXIO) || (sd->flags & VF_RETRYERRORS) == 0) { 110 gravity = "fatal "; 111 set_sd_state(rqe->sdno, sd_stale, setstate_force); /* subdisk is stale */ 112 } 113 log(LOG_ERR, 114 "%s:%s write error, block %d for %ld bytes\n", 115 gravity, 116 sd->name, 117 bp->b_blkno, 118 bp->b_bcount); 119 } 120 log(LOG_ERR, 121 "%s: user buffer block %d for %ld bytes\n", 122 sd->name, 123 ubp->b_blkno, 124 ubp->b_bcount); 125 if (rq->error == ENXIO) { /* the drive's down too */ 126 log(LOG_ERR, 127 "%s: fatal drive I/O error, block %d for %ld bytes\n", 128 DRIVE[rqe->driveno].label.name, 129 bp->b_blkno, 130 bp->b_bcount); 131 DRIVE[rqe->driveno].lasterror = rq->error; 132 set_drive_state(rqe->driveno, /* take the drive down */ 133 drive_down, 134 setstate_force); 135 } 136 } 137 /* Now update the statistics */ 138 if (bp->b_flags & B_READ) { /* read operation */ 139 DRIVE[rqe->driveno].reads++; 140 DRIVE[rqe->driveno].bytes_read += bp->b_bcount; 141 SD[rqe->sdno].reads++; 142 SD[rqe->sdno].bytes_read += bp->b_bcount; 143 PLEX[rqe->rqg->plexno].reads++; 144 PLEX[rqe->rqg->plexno].bytes_read += bp->b_bcount; 145 if (PLEX[rqe->rqg->plexno].volno >= 0) { /* volume I/O, not plex */ 146 VOL[PLEX[rqe->rqg->plexno].volno].reads++; 147 VOL[PLEX[rqe->rqg->plexno].volno].bytes_read += bp->b_bcount; 148 } 149 } else { /* write operation */ 150 DRIVE[rqe->driveno].writes++; 151 DRIVE[rqe->driveno].bytes_written += bp->b_bcount; 152 SD[rqe->sdno].writes++; 153 SD[rqe->sdno].bytes_written += bp->b_bcount; 154 PLEX[rqe->rqg->plexno].writes++; 155 PLEX[rqe->rqg->plexno].bytes_written += bp->b_bcount; 156 if (PLEX[rqe->rqg->plexno].volno >= 0) { /* volume I/O, not plex */ 157 VOL[PLEX[rqe->rqg->plexno].volno].writes++; 158 VOL[PLEX[rqe->rqg->plexno].volno].bytes_written += bp->b_bcount; 159 } 160 } 161 if (rqg->flags & XFR_RECOVERY_READ) { /* recovery read, */ 162 int *sdata; /* source */ 163 int *data; /* and group data */ 164 int length; /* and count involved */ 165 int count; /* loop counter */ 166 struct rqelement *urqe = &rqg->rqe[rqg->badsdno]; /* rqe of the bad subdisk */ 167 168 /* XOR destination is the user data */ 169 sdata = (int *) &rqe->b.b_data[rqe->groupoffset << DEV_BSHIFT]; /* old data contents */ 170 data = (int *) &urqe->b.b_data[urqe->groupoffset << DEV_BSHIFT]; /* destination */ 171 length = urqe->grouplen * (DEV_BSIZE / sizeof(int)); /* and number of ints */ 172 173 for (count = 0; count < length; count++) 174 data[count] ^= sdata[count]; 175 176 /* 177 * In a normal read, we will normally read directly 178 * into the user buffer. This doesn't work if 179 * we're also doing a recovery, so we have to 180 * copy it 181 */ 182 if (rqe->flags & XFR_NORMAL_READ) { /* normal read as well, */ 183 char *src = &rqe->b.b_data[rqe->dataoffset << DEV_BSHIFT]; /* read data is here */ 184 char *dst; 185 186 dst = (char *) ubp->b_data + (rqe->useroffset << DEV_BSHIFT); /* where to put it in user buffer */ 187 length = rqe->datalen << DEV_BSHIFT; /* and count involved */ 188 bcopy(src, dst, length); /* move it */ 189 } 190 } else if ((rqg->flags & (XFR_NORMAL_WRITE | XFR_DEGRADED_WRITE)) /* RAID 4/5 group write operation */ 191 &&(rqg->active == 1)) /* and this is the last active request */ 192 complete_raid5_write(rqe); 193 /* 194 * This is the earliest place where we can be 195 * sure that the request has really finished, 196 * since complete_raid5_write can issue new 197 * requests. 198 */ 199 rqg->active--; /* this request now finished */ 200 if (rqg->active == 0) { /* request group finished, */ 201 rq->active--; /* one less */ 202 if (rqg->lock) { /* got a lock? */ 203 unlockrange(rqg->plexno, rqg->lock); /* yes, free it */ 204 rqg->lock = 0; 205 } 206 } 207 if (rq->active == 0) { /* request finished, */ 208 #ifdef VINUMDEBUG 209 if (debug & DEBUG_RESID) { 210 if (ubp->b_resid != 0) /* still something to transfer? */ 211 Debugger("resid"); 212 } 213 #endif 214 215 if (rq->error) { /* did we have an error? */ 216 if (rq->isplex) { /* plex operation, */ 217 ubp->b_flags |= B_ERROR; /* yes, propagate to user */ 218 ubp->b_error = rq->error; 219 } else /* try to recover */ 220 queue_daemon_request(daemonrq_ioerror, (union daemoninfo) rq); /* let the daemon complete */ 221 } else { 222 ubp->b_resid = 0; /* completed our transfer */ 223 if (rq->isplex == 0) /* volume request, */ 224 VOL[rq->volplex.volno].active--; /* another request finished */ 225 biodone(ubp); /* top level buffer completed */ 226 freerq(rq); /* return the request storage */ 227 } 228 } 229 } 230 231 /* Free a request block and anything hanging off it */ 232 void 233 freerq(struct request *rq) 234 { 235 struct rqgroup *rqg; 236 struct rqgroup *nrqg; /* next in chain */ 237 int rqno; 238 239 for (rqg = rq->rqg; rqg != NULL; rqg = nrqg) { /* through the whole request chain */ 240 if (rqg->lock) /* got a lock? */ 241 unlockrange(rqg->plexno, rqg->lock); /* yes, free it */ 242 for (rqno = 0; rqno < rqg->count; rqno++) { 243 if ((rqg->rqe[rqno].flags & XFR_MALLOCED) /* data buffer was malloced, */ 244 &&rqg->rqe[rqno].b.b_data) /* and the allocation succeeded */ 245 Free(rqg->rqe[rqno].b.b_data); /* free it */ 246 if (rqg->rqe[rqno].flags & XFR_BUFLOCKED) { /* locked this buffer, */ 247 BUF_UNLOCK(&rqg->rqe[rqno].b); /* unlock it again */ 248 BUF_LOCKFREE(&rqg->rqe[rqno].b); 249 } 250 } 251 nrqg = rqg->next; /* note the next one */ 252 Free(rqg); /* and free this one */ 253 } 254 Free(rq); /* free the request itself */ 255 } 256 257 /* I/O on subdisk completed */ 258 void 259 sdio_done(struct buf *bp) 260 { 261 struct sdbuf *sbp; 262 263 sbp = (struct sdbuf *) bp; 264 if (sbp->b.b_flags & B_ERROR) { /* had an error */ 265 sbp->bp->b_flags |= B_ERROR; /* propagate upwards */ 266 sbp->bp->b_error = sbp->b.b_error; 267 } 268 #ifdef VINUMDEBUG 269 if (debug & DEBUG_LASTREQS) 270 logrq(loginfo_sdiodone, (union rqinfou) bp, bp); 271 #endif 272 sbp->bp->b_resid = sbp->b.b_resid; /* copy the resid field */ 273 /* Now update the statistics */ 274 if (bp->b_flags & B_READ) { /* read operation */ 275 DRIVE[sbp->driveno].reads++; 276 DRIVE[sbp->driveno].bytes_read += sbp->b.b_bcount; 277 SD[sbp->sdno].reads++; 278 SD[sbp->sdno].bytes_read += sbp->b.b_bcount; 279 } else { /* write operation */ 280 DRIVE[sbp->driveno].writes++; 281 DRIVE[sbp->driveno].bytes_written += sbp->b.b_bcount; 282 SD[sbp->sdno].writes++; 283 SD[sbp->sdno].bytes_written += sbp->b.b_bcount; 284 } 285 biodone(sbp->bp); /* complete the caller's I/O */ 286 BUF_UNLOCK(&sbp->b); 287 BUF_LOCKFREE(&sbp->b); 288 Free(sbp); 289 } 290 291 /* Start the second phase of a RAID-4 or RAID-5 group write operation. */ 292 void 293 complete_raid5_write(struct rqelement *rqe) 294 { 295 int *sdata; /* source */ 296 int *pdata; /* and parity block data */ 297 int length; /* and count involved */ 298 int count; /* loop counter */ 299 int rqno; /* request index */ 300 int rqoffset; /* offset of request data from parity data */ 301 struct buf *ubp; /* user buffer header */ 302 struct request *rq; /* pointer to our request */ 303 struct rqgroup *rqg; /* and to the request group */ 304 struct rqelement *prqe; /* point to the parity block */ 305 struct drive *drive; /* drive to access */ 306 307 rqg = rqe->rqg; /* and to our request group */ 308 rq = rqg->rq; /* point to our request */ 309 ubp = rq->bp; /* user's buffer header */ 310 prqe = &rqg->rqe[0]; /* point to the parity block */ 311 312 /* 313 * If we get to this function, we have normal or 314 * degraded writes, or a combination of both. We do 315 * the same thing in each case: we perform an 316 * exclusive or to the parity block. The only 317 * difference is the origin of the data and the 318 * address range. 319 */ 320 if (rqe->flags & XFR_DEGRADED_WRITE) { /* do the degraded write stuff */ 321 pdata = (int *) (&prqe->b.b_data[(prqe->groupoffset) << DEV_BSHIFT]); /* parity data pointer */ 322 bzero(pdata, prqe->grouplen << DEV_BSHIFT); /* start with nothing in the parity block */ 323 324 /* Now get what data we need from each block */ 325 for (rqno = 1; rqno < rqg->count; rqno++) { /* for all the data blocks */ 326 rqe = &rqg->rqe[rqno]; /* this request */ 327 sdata = (int *) (&rqe->b.b_data[rqe->groupoffset << DEV_BSHIFT]); /* old data */ 328 length = rqe->grouplen << (DEV_BSHIFT - 2); /* and count involved */ 329 330 /* 331 * Add the data block to the parity block. Before 332 * we started the request, we zeroed the parity 333 * block, so the result of adding all the other 334 * blocks and the block we want to write will be 335 * the correct parity block. 336 */ 337 for (count = 0; count < length; count++) 338 pdata[count] ^= sdata[count]; 339 if ((rqe->flags & XFR_MALLOCED) /* the buffer was malloced, */ 340 &&((rqg->flags & XFR_NORMAL_WRITE) == 0)) { /* and we have no normal write, */ 341 Free(rqe->b.b_data); /* free it now */ 342 rqe->flags &= ~XFR_MALLOCED; 343 } 344 } 345 } 346 if (rqg->flags & XFR_NORMAL_WRITE) { /* do normal write stuff */ 347 /* Get what data we need from each block */ 348 for (rqno = 1; rqno < rqg->count; rqno++) { /* for all the data blocks */ 349 rqe = &rqg->rqe[rqno]; /* this request */ 350 if ((rqe->flags & (XFR_DATA_BLOCK | XFR_BAD_SUBDISK | XFR_NORMAL_WRITE)) 351 == (XFR_DATA_BLOCK | XFR_NORMAL_WRITE)) { /* good data block to write */ 352 sdata = (int *) &rqe->b.b_data[rqe->dataoffset << DEV_BSHIFT]; /* old data contents */ 353 rqoffset = rqe->dataoffset + rqe->sdoffset - prqe->sdoffset; /* corresponding parity block offset */ 354 pdata = (int *) (&prqe->b.b_data[rqoffset << DEV_BSHIFT]); /* parity data pointer */ 355 length = rqe->datalen * (DEV_BSIZE / sizeof(int)); /* and number of ints */ 356 357 /* 358 * "remove" the old data block 359 * from the parity block 360 */ 361 if ((pdata < ((int *) prqe->b.b_data)) 362 || (&pdata[length] > ((int *) (prqe->b.b_data + prqe->b.b_bcount))) 363 || (sdata < ((int *) rqe->b.b_data)) 364 || (&sdata[length] > ((int *) (rqe->b.b_data + rqe->b.b_bcount)))) 365 panic("complete_raid5_write: bounds overflow"); 366 for (count = 0; count < length; count++) 367 pdata[count] ^= sdata[count]; 368 369 /* "add" the new data block */ 370 sdata = (int *) (&ubp->b_data[rqe->useroffset << DEV_BSHIFT]); /* new data */ 371 if ((sdata < ((int *) ubp->b_data)) 372 || (&sdata[length] > ((int *) (ubp->b_data + ubp->b_bcount)))) 373 panic("complete_raid5_write: bounds overflow"); 374 for (count = 0; count < length; count++) 375 pdata[count] ^= sdata[count]; 376 377 /* Free the malloced buffer */ 378 if (rqe->flags & XFR_MALLOCED) { /* the buffer was malloced, */ 379 Free(rqe->b.b_data); /* free it */ 380 rqe->flags &= ~XFR_MALLOCED; 381 } else 382 panic("complete_raid5_write: malloc conflict"); 383 384 if ((rqe->b.b_flags & B_READ) /* this was a read */ 385 &&((rqe->flags & XFR_BAD_SUBDISK) == 0)) { /* and we can write this block */ 386 rqe->b.b_flags &= ~(B_READ | B_DONE); /* we're writing now */ 387 rqe->b.b_flags |= B_CALL; /* call us when you're done */ 388 rqe->b.b_iodone = complete_rqe; /* by calling us here */ 389 rqe->flags &= ~XFR_PARITYOP; /* reset flags that brought us here */ 390 rqe->b.b_data = &ubp->b_data[rqe->useroffset << DEV_BSHIFT]; /* point to the user data */ 391 rqe->b.b_bcount = rqe->datalen << DEV_BSHIFT; /* length to write */ 392 rqe->b.b_bufsize = rqe->b.b_bcount; /* don't claim more */ 393 rqe->b.b_resid = rqe->b.b_bcount; /* nothing transferred */ 394 rqe->b.b_blkno += rqe->dataoffset; /* point to the correct block */ 395 rqg->active++; /* another active request */ 396 drive = &DRIVE[rqe->driveno]; /* drive to access */ 397 398 /* We can't sleep here, so we just increment the counters. */ 399 drive->active++; 400 if (drive->active >= drive->maxactive) 401 drive->maxactive = drive->active; 402 vinum_conf.active++; 403 if (vinum_conf.active >= vinum_conf.maxactive) 404 vinum_conf.maxactive = vinum_conf.active; 405 #if VINUMDEBUG 406 if (debug & DEBUG_ADDRESSES) 407 log(LOG_DEBUG, 408 " %s dev %d.%d, sd %d, offset 0x%x, devoffset 0x%x, length %ld\n", 409 rqe->b.b_flags & B_READ ? "Read" : "Write", 410 major(rqe->b.b_dev), 411 minor(rqe->b.b_dev), 412 rqe->sdno, 413 (u_int) (rqe->b.b_blkno - SD[rqe->sdno].driveoffset), 414 rqe->b.b_blkno, 415 rqe->b.b_bcount); 416 if (debug & DEBUG_LASTREQS) 417 logrq(loginfo_raid5_data, (union rqinfou) rqe, ubp); 418 #endif 419 BUF_STRATEGY(&rqe->b, 0); 420 } 421 } 422 } 423 } 424 /* Finally, write the parity block */ 425 rqe = &rqg->rqe[0]; 426 rqe->b.b_flags &= ~(B_READ | B_DONE); /* we're writing now */ 427 rqe->b.b_flags |= B_CALL; /* tell us when you're done */ 428 rqe->b.b_iodone = complete_rqe; /* by calling us here */ 429 rqg->flags &= ~XFR_PARITYOP; /* reset flags that brought us here */ 430 rqe->b.b_bcount = rqe->buflen << DEV_BSHIFT; /* length to write */ 431 rqe->b.b_bufsize = rqe->b.b_bcount; /* don't claim we have more */ 432 rqe->b.b_resid = rqe->b.b_bcount; /* nothing transferred */ 433 rqg->active++; /* another active request */ 434 drive = &DRIVE[rqe->driveno]; /* drive to access */ 435 436 /* We can't sleep here, so we just increment the counters. */ 437 drive->active++; 438 if (drive->active >= drive->maxactive) 439 drive->maxactive = drive->active; 440 vinum_conf.active++; 441 if (vinum_conf.active >= vinum_conf.maxactive) 442 vinum_conf.maxactive = vinum_conf.active; 443 444 #if VINUMDEBUG 445 if (debug & DEBUG_ADDRESSES) 446 log(LOG_DEBUG, 447 " %s dev %d.%d, sd %d, offset 0x%x, devoffset 0x%x, length %ld\n", 448 rqe->b.b_flags & B_READ ? "Read" : "Write", 449 major(rqe->b.b_dev), 450 minor(rqe->b.b_dev), 451 rqe->sdno, 452 (u_int) (rqe->b.b_blkno - SD[rqe->sdno].driveoffset), 453 rqe->b.b_blkno, 454 rqe->b.b_bcount); 455 if (debug & DEBUG_LASTREQS) 456 logrq(loginfo_raid5_parity, (union rqinfou) rqe, ubp); 457 #endif 458 BUF_STRATEGY(&rqe->b, 0); 459 } 460 461 /* Local Variables: */ 462 /* fill-column: 50 */ 463 /* End: */
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