sys/dev/raid/vinum/vinuminterrupt.c

   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: src/sys/dev/vinum/vinuminterrupt.c,v 1.25.2.3 2001/05/28 05:56:27 grog Exp $
  44  * $DragonFly: src/sys/dev/raid/vinum/vinuminterrupt.c,v 1.3 2003/08/07 21:17:09 dillon Exp $
  45  */
  46
  47 #include "vinumhdr.h"
  48 #include "request.h"
  49 #include <sys/resourcevar.h>
  50
  51 void complete_raid5_write(struct rqelement *);
  52 void complete_rqe(struct buf *bp);
  53 void sdio_done(struct buf *bp);
  54
  55 /*
  56  * Take a completed buffer, transfer the data back if
  57  * it's a read, and complete the high-level request
  58  * if this is the last subrequest.
  59  *
  60  * The bp parameter is in fact a struct rqelement, which
  61  * includes a couple of extras at the end.
  62  */
  63 void
  64 complete_rqe(struct buf *bp)
  65 {
  66     struct rqelement *rqe;
  67     struct request *rq;
  68     struct rqgroup *rqg;
  69     struct buf *ubp;                                        /* user buffer */
  70     struct drive *drive;
  71     struct sd *sd;
  72     char *gravity;                                          /* for error messages */
  73
  74     rqe = (struct rqelement *) bp;                          /* point to the element that completed */
  75     rqg = rqe->rqg;                                         /* and the request group */
  76     rq = rqg->rq;                                           /* and the complete request */
  77     ubp = rq->bp;                                           /* user buffer */
  78
  79 #ifdef VINUMDEBUG
  80     if (debug & DEBUG_LASTREQS)
  81         logrq(loginfo_iodone, (union rqinfou) rqe, ubp);
  82 #endif
  83     drive = &DRIVE[rqe->driveno];
  84     drive->active--;                                        /* one less outstanding I/O on this drive */
  85     vinum_conf.active--;                                    /* one less outstanding I/O globally */
  86     if ((drive->active == (DRIVE_MAXACTIVE - 1))            /* we were at the drive limit */
  87     ||(vinum_conf.active == VINUM_MAXACTIVE))               /* or the global limit */
  88         wakeup(&launch_requests);                           /* let another one at it */
  89     if ((bp->b_flags & B_ERROR) != 0) {                     /* transfer in error */
  90         gravity = "";
  91         sd = &SD[rqe->sdno];
  92
  93         if (bp->b_error != 0)                               /* did it return a number? */
  94             rq->error = bp->b_error;                        /* yes, put it in. */
  95         else if (rq->error == 0)                            /* no: do we have one already? */
  96             rq->error = EIO;                                /* no: catchall "I/O error" */
  97         sd->lasterror = rq->error;
  98         if (bp->b_flags & B_READ) {
  99             if ((rq->error == ENXIO) || (sd->flags & VF_RETRYERRORS) == 0) {
 100                 gravity = " fatal";
 101                 set_sd_state(rqe->sdno, sd_crashed, setstate_force); /* subdisk is crashed */
 102             }
 103             log(LOG_ERR,
 104                 "%s:%s read error, block %d for %ld bytes\n",
 105                 gravity,
 106                 sd->name,
 107                 bp->b_blkno,
 108                 bp->b_bcount);
 109         } else {                                            /* write operation */
 110             if ((rq->error == ENXIO) || (sd->flags & VF_RETRYERRORS) == 0) {
 111                 gravity = "fatal ";
 112                 set_sd_state(rqe->sdno, sd_stale, setstate_force); /* subdisk is stale */
 113             }
 114             log(LOG_ERR,
 115                 "%s:%s write error, block %d for %ld bytes\n",
 116                 gravity,
 117                 sd->name,
 118                 bp->b_blkno,
 119                 bp->b_bcount);
 120         }
 121         log(LOG_ERR,
 122             "%s: user buffer block %d for %ld bytes\n",
 123             sd->name,
 124             ubp->b_blkno,
 125             ubp->b_bcount);
 126         if (rq->error == ENXIO) {                           /* the drive's down too */
 127             log(LOG_ERR,
 128                 "%s: fatal drive I/O error, block %d for %ld bytes\n",
 129                 DRIVE[rqe->driveno].label.name,
 130                 bp->b_blkno,
 131                 bp->b_bcount);
 132             DRIVE[rqe->driveno].lasterror = rq->error;
 133             set_drive_state(rqe->driveno,                   /* take the drive down */
 134                 drive_down,
 135                 setstate_force);
 136         }
 137     }
 138     /* Now update the statistics */
 139     if (bp->b_flags & B_READ) {                             /* read operation */
 140         DRIVE[rqe->driveno].reads++;
 141         DRIVE[rqe->driveno].bytes_read += bp->b_bcount;
 142         SD[rqe->sdno].reads++;
 143         SD[rqe->sdno].bytes_read += bp->b_bcount;
 144         PLEX[rqe->rqg->plexno].reads++;
 145         PLEX[rqe->rqg->plexno].bytes_read += bp->b_bcount;
 146         if (PLEX[rqe->rqg->plexno].volno >= 0) {            /* volume I/O, not plex */
 147             VOL[PLEX[rqe->rqg->plexno].volno].reads++;
 148             VOL[PLEX[rqe->rqg->plexno].volno].bytes_read += bp->b_bcount;
 149         }
 150     } else {                                                /* write operation */
 151         DRIVE[rqe->driveno].writes++;
 152         DRIVE[rqe->driveno].bytes_written += bp->b_bcount;
 153         SD[rqe->sdno].writes++;
 154         SD[rqe->sdno].bytes_written += bp->b_bcount;
 155         PLEX[rqe->rqg->plexno].writes++;
 156         PLEX[rqe->rqg->plexno].bytes_written += bp->b_bcount;
 157         if (PLEX[rqe->rqg->plexno].volno >= 0) {            /* volume I/O, not plex */
 158             VOL[PLEX[rqe->rqg->plexno].volno].writes++;
 159             VOL[PLEX[rqe->rqg->plexno].volno].bytes_written += bp->b_bcount;
 160         }
 161     }
 162     if (rqg->flags & XFR_RECOVERY_READ) {                   /* recovery read, */
 163         int *sdata;                                         /* source */
 164         int *data;                                          /* and group data */
 165         int length;                                         /* and count involved */
 166         int count;                                          /* loop counter */
 167         struct rqelement *urqe = &rqg->rqe[rqg->badsdno];   /* rqe of the bad subdisk */
 168
 169         /* XOR destination is the user data */
 170         sdata = (int *) &rqe->b.b_data[rqe->groupoffset << DEV_BSHIFT]; /* old data contents */
 171         data = (int *) &urqe->b.b_data[urqe->groupoffset << DEV_BSHIFT]; /* destination */
 172         length = urqe->grouplen * (DEV_BSIZE / sizeof(int)); /* and number of ints */
 173
 174         for (count = 0; count < length; count++)
 175             data[count] ^= sdata[count];
 176
 177         /*
 178          * In a normal read, we will normally read directly
 179          * into the user buffer.  This doesn't work if
 180          * we're also doing a recovery, so we have to
 181          * copy it
 182          */
 183         if (rqe->flags & XFR_NORMAL_READ) {                 /* normal read as well, */
 184             char *src = &rqe->b.b_data[rqe->dataoffset << DEV_BSHIFT]; /* read data is here */
 185             char *dst;
 186
 187             dst = (char *) ubp->b_data + (rqe->useroffset << DEV_BSHIFT); /* where to put it in user buffer */
 188             length = rqe->datalen << DEV_BSHIFT;            /* and count involved */
 189             bcopy(src, dst, length);                        /* move it */
 190         }
 191     } else if ((rqg->flags & (XFR_NORMAL_WRITE | XFR_DEGRADED_WRITE)) /* RAID 4/5 group write operation  */
 192     &&(rqg->active == 1))                                   /* and this is the last active request */
 193         complete_raid5_write(rqe);
 194     /*
 195      * This is the earliest place where we can be
 196      * sure that the request has really finished,
 197      * since complete_raid5_write can issue new
 198      * requests.
 199      */
 200     rqg->active--;                                          /* this request now finished */
 201     if (rqg->active == 0) {                                 /* request group finished, */
 202         rq->active--;                                       /* one less */
 203         if (rqg->lock) {                                    /* got a lock? */
 204             unlockrange(rqg->plexno, rqg->lock);            /* yes, free it */
 205             rqg->lock = 0;
 206         }
 207     }
 208     if (rq->active == 0) {                                  /* request finished, */
 209 #ifdef VINUMDEBUG
 210         if (debug & DEBUG_RESID) {
 211             if (ubp->b_resid != 0)                          /* still something to transfer? */
 212                 Debugger("resid");
 213         }
 214 #endif
 215
 216         if (rq->error) {                                    /* did we have an error? */
 217             if (rq->isplex) {                               /* plex operation, */
 218                 ubp->b_flags |= B_ERROR;                    /* yes, propagate to user */
 219                 ubp->b_error = rq->error;
 220             } else                                          /* try to recover */
 221                 queue_daemon_request(daemonrq_ioerror, (union daemoninfo) rq); /* let the daemon complete */
 222         } else {
 223             ubp->b_resid = 0;                               /* completed our transfer */
 224             if (rq->isplex == 0)                            /* volume request, */
 225                 VOL[rq->volplex.volno].active--;            /* another request finished */
 226             biodone(ubp);                                   /* top level buffer completed */
 227             freerq(rq);                                     /* return the request storage */
 228         }
 229     }
 230 }
 231
 232 /* Free a request block and anything hanging off it */
 233 void
 234 freerq(struct request *rq)
 235 {
 236     struct rqgroup *rqg;
 237     struct rqgroup *nrqg;                                   /* next in chain */
 238     int rqno;
 239
 240     for (rqg = rq->rqg; rqg != NULL; rqg = nrqg) {          /* through the whole request chain */
 241         if (rqg->lock)                                      /* got a lock? */
 242             unlockrange(rqg->plexno, rqg->lock);            /* yes, free it */
 243         for (rqno = 0; rqno < rqg->count; rqno++) {
 244             if ((rqg->rqe[rqno].flags & XFR_MALLOCED)       /* data buffer was malloced, */
 245             &&rqg->rqe[rqno].b.b_data)                      /* and the allocation succeeded */
 246                 Free(rqg->rqe[rqno].b.b_data);              /* free it */
 247             if (rqg->rqe[rqno].flags & XFR_BUFLOCKED) {     /* locked this buffer, */
 248                 BUF_UNLOCK(&rqg->rqe[rqno].b);              /* unlock it again */
 249                 BUF_LOCKFREE(&rqg->rqe[rqno].b);
 250             }
 251         }
 252         nrqg = rqg->next;                                   /* note the next one */
 253         Free(rqg);                                          /* and free this one */
 254     }
 255     Free(rq);                                               /* free the request itself */
 256 }
 257
 258 /* I/O on subdisk completed */
 259 void
 260 sdio_done(struct buf *bp)
 261 {
 262     struct sdbuf *sbp;
 263
 264     sbp = (struct sdbuf *) bp;
 265     if (sbp->b.b_flags & B_ERROR) {                         /* had an error */
 266         sbp->bp->b_flags |= B_ERROR;                        /* propagate upwards */
 267         sbp->bp->b_error = sbp->b.b_error;
 268     }
 269 #ifdef VINUMDEBUG
 270     if (debug & DEBUG_LASTREQS)
 271         logrq(loginfo_sdiodone, (union rqinfou) bp, bp);
 272 #endif
 273     sbp->bp->b_resid = sbp->b.b_resid;                      /* copy the resid field */
 274     /* Now update the statistics */
 275     if (bp->b_flags & B_READ) {                             /* read operation */
 276         DRIVE[sbp->driveno].reads++;
 277         DRIVE[sbp->driveno].bytes_read += sbp->b.b_bcount;
 278         SD[sbp->sdno].reads++;
 279         SD[sbp->sdno].bytes_read += sbp->b.b_bcount;
 280     } else {                                                /* write operation */
 281         DRIVE[sbp->driveno].writes++;
 282         DRIVE[sbp->driveno].bytes_written += sbp->b.b_bcount;
 283         SD[sbp->sdno].writes++;
 284         SD[sbp->sdno].bytes_written += sbp->b.b_bcount;
 285     }
 286     biodone(sbp->bp);                                       /* complete the caller's I/O */
 287     BUF_UNLOCK(&sbp->b);
 288     BUF_LOCKFREE(&sbp->b);
 289     Free(sbp);
 290 }
 291
 292 /* Start the second phase of a RAID-4 or RAID-5 group write operation. */
 293 void
 294 complete_raid5_write(struct rqelement *rqe)
 295 {
 296     int *sdata;                                             /* source */
 297     int *pdata;                                             /* and parity block data */
 298     int length;                                             /* and count involved */
 299     int count;                                              /* loop counter */
 300     int rqno;                                               /* request index */
 301     int rqoffset;                                           /* offset of request data from parity data */
 302     struct buf *ubp;                                        /* user buffer header */
 303     struct request *rq;                                     /* pointer to our request */
 304     struct rqgroup *rqg;                                    /* and to the request group */
 305     struct rqelement *prqe;                                 /* point to the parity block */
 306     struct drive *drive;                                    /* drive to access */
 307
 308     rqg = rqe->rqg;                                         /* and to our request group */
 309     rq = rqg->rq;                                           /* point to our request */
 310     ubp = rq->bp;                                           /* user's buffer header */
 311     prqe = &rqg->rqe[0];                                    /* point to the parity block */
 312
 313     /*
 314      * If we get to this function, we have normal or
 315      * degraded writes, or a combination of both.  We do
 316      * the same thing in each case: we perform an
 317      * exclusive or to the parity block.  The only
 318      * difference is the origin of the data and the
 319      * address range.
 320      */
 321     if (rqe->flags & XFR_DEGRADED_WRITE) {                  /* do the degraded write stuff */
 322         pdata = (int *) (&prqe->b.b_data[(prqe->groupoffset) << DEV_BSHIFT]); /* parity data pointer */
 323         bzero(pdata, prqe->grouplen << DEV_BSHIFT);         /* start with nothing in the parity block */
 324
 325         /* Now get what data we need from each block */
 326         for (rqno = 1; rqno < rqg->count; rqno++) {         /* for all the data blocks */
 327             rqe = &rqg->rqe[rqno];                          /* this request */
 328             sdata = (int *) (&rqe->b.b_data[rqe->groupoffset << DEV_BSHIFT]); /* old data */
 329             length = rqe->grouplen << (DEV_BSHIFT - 2);     /* and count involved */
 330
 331             /*
 332              * Add the data block to the parity block.  Before
 333              * we started the request, we zeroed the parity
 334              * block, so the result of adding all the other
 335              * blocks and the block we want to write will be
 336              * the correct parity block.
 337              */
 338             for (count = 0; count < length; count++)
 339                 pdata[count] ^= sdata[count];
 340             if ((rqe->flags & XFR_MALLOCED)                 /* the buffer was malloced, */
 341             &&((rqg->flags & XFR_NORMAL_WRITE) == 0)) {     /* and we have no normal write, */
 342                 Free(rqe->b.b_data);                        /* free it now */
 343                 rqe->flags &= ~XFR_MALLOCED;
 344             }
 345         }
 346     }
 347     if (rqg->flags & XFR_NORMAL_WRITE) {                    /* do normal write stuff */
 348         /* Get what data we need from each block */
 349         for (rqno = 1; rqno < rqg->count; rqno++) {         /* for all the data blocks */
 350             rqe = &rqg->rqe[rqno];                          /* this request */
 351             if ((rqe->flags & (XFR_DATA_BLOCK | XFR_BAD_SUBDISK | XFR_NORMAL_WRITE))
 352                 == (XFR_DATA_BLOCK | XFR_NORMAL_WRITE)) {   /* good data block to write */
 353                 sdata = (int *) &rqe->b.b_data[rqe->dataoffset << DEV_BSHIFT]; /* old data contents */
 354                 rqoffset = rqe->dataoffset + rqe->sdoffset - prqe->sdoffset; /* corresponding parity block offset */
 355                 pdata = (int *) (&prqe->b.b_data[rqoffset << DEV_BSHIFT]); /* parity data pointer */
 356                 length = rqe->datalen * (DEV_BSIZE / sizeof(int)); /* and number of ints */
 357
 358                 /*
 359                  * "remove" the old data block
 360                  * from the parity block
 361                  */
 362                 if ((pdata < ((int *) prqe->b.b_data))
 363                     || (&pdata[length] > ((int *) (prqe->b.b_data + prqe->b.b_bcount)))
 364                     || (sdata < ((int *) rqe->b.b_data))
 365                     || (&sdata[length] > ((int *) (rqe->b.b_data + rqe->b.b_bcount))))
 366                     panic("complete_raid5_write: bounds overflow");
 367                 for (count = 0; count < length; count++)
 368                     pdata[count] ^= sdata[count];
 369
 370                 /* "add" the new data block */
 371                 sdata = (int *) (&ubp->b_data[rqe->useroffset << DEV_BSHIFT]); /* new data */
 372                 if ((sdata < ((int *) ubp->b_data))
 373                     || (&sdata[length] > ((int *) (ubp->b_data + ubp->b_bcount))))
 374                     panic("complete_raid5_write: bounds overflow");
 375                 for (count = 0; count < length; count++)
 376                     pdata[count] ^= sdata[count];
 377
 378                 /* Free the malloced buffer */
 379                 if (rqe->flags & XFR_MALLOCED) {            /* the buffer was malloced, */
 380                     Free(rqe->b.b_data);                    /* free it */
 381                     rqe->flags &= ~XFR_MALLOCED;
 382                 } else
 383                     panic("complete_raid5_write: malloc conflict");
 384
 385                 if ((rqe->b.b_flags & B_READ)               /* this was a read */
 386                 &&((rqe->flags & XFR_BAD_SUBDISK) == 0)) {  /* and we can write this block */
 387                     rqe->b.b_flags &= ~(B_READ | B_DONE);   /* we're writing now */
 388                     rqe->b.b_flags |= B_CALL;               /* call us when you're done */
 389                     rqe->b.b_iodone = complete_rqe;         /* by calling us here */
 390                     rqe->flags &= ~XFR_PARITYOP;            /* reset flags that brought us here */
 391                     rqe->b.b_data = &ubp->b_data[rqe->useroffset << DEV_BSHIFT]; /* point to the user data */
 392                     rqe->b.b_bcount = rqe->datalen << DEV_BSHIFT; /* length to write */
 393                     rqe->b.b_bufsize = rqe->b.b_bcount;     /* don't claim more */
 394                     rqe->b.b_resid = rqe->b.b_bcount;       /* nothing transferred */
 395                     rqe->b.b_blkno += rqe->dataoffset;      /* point to the correct block */
 396                     rqg->active++;                          /* another active request */
 397                     drive = &DRIVE[rqe->driveno];           /* drive to access */
 398
 399                                                             /* We can't sleep here, so we just increment the counters. */
 400                     drive->active++;
 401                     if (drive->active >= drive->maxactive)
 402                         drive->maxactive = drive->active;
 403                     vinum_conf.active++;
 404                     if (vinum_conf.active >= vinum_conf.maxactive)
 405                         vinum_conf.maxactive = vinum_conf.active;
 406 #if VINUMDEBUG
 407                     if (debug & DEBUG_ADDRESSES)
 408                         log(LOG_DEBUG,
 409                             "  %s dev %d.%d, sd %d, offset 0x%x, devoffset 0x%x, length %ld\n",
 410                             rqe->b.b_flags & B_READ ? "Read" : "Write",
 411                             major(rqe->b.b_dev),
 412                             minor(rqe->b.b_dev),
 413                             rqe->sdno,
 414                             (u_int) (rqe->b.b_blkno - SD[rqe->sdno].driveoffset),
 415                             rqe->b.b_blkno,
 416                             rqe->b.b_bcount);
 417                     if (debug & DEBUG_LASTREQS)
 418                         logrq(loginfo_raid5_data, (union rqinfou) rqe, ubp);
 419 #endif
 420                     BUF_STRATEGY(&rqe->b, 0);
 421                 }
 422             }
 423         }
 424     }
 425     /* Finally, write the parity block */
 426     rqe = &rqg->rqe[0];
 427     rqe->b.b_flags &= ~(B_READ | B_DONE);                   /* we're writing now */
 428     rqe->b.b_flags |= B_CALL;                               /* tell us when you're done */
 429     rqe->b.b_iodone = complete_rqe;                         /* by calling us here */
 430     rqg->flags &= ~XFR_PARITYOP;                            /* reset flags that brought us here */
 431     rqe->b.b_bcount = rqe->buflen << DEV_BSHIFT;            /* length to write */
 432     rqe->b.b_bufsize = rqe->b.b_bcount;                     /* don't claim we have more */
 433     rqe->b.b_resid = rqe->b.b_bcount;                       /* nothing transferred */
 434     rqg->active++;                                          /* another active request */
 435     drive = &DRIVE[rqe->driveno];                           /* drive to access */
 436
 437     /* We can't sleep here, so we just increment the counters. */
 438     drive->active++;
 439     if (drive->active >= drive->maxactive)
 440         drive->maxactive = drive->active;
 441     vinum_conf.active++;
 442     if (vinum_conf.active >= vinum_conf.maxactive)
 443         vinum_conf.maxactive = vinum_conf.active;
 444
 445 #if VINUMDEBUG
 446     if (debug & DEBUG_ADDRESSES)
 447         log(LOG_DEBUG,
 448             "  %s dev %d.%d, sd %d, offset 0x%x, devoffset 0x%x, length %ld\n",
 449             rqe->b.b_flags & B_READ ? "Read" : "Write",
 450             major(rqe->b.b_dev),
 451             minor(rqe->b.b_dev),
 452             rqe->sdno,
 453             (u_int) (rqe->b.b_blkno - SD[rqe->sdno].driveoffset),
 454             rqe->b.b_blkno,
 455             rqe->b.b_bcount);
 456     if (debug & DEBUG_LASTREQS)
 457         logrq(loginfo_raid5_parity, (union rqinfou) rqe, ubp);
 458 #endif
 459     BUF_STRATEGY(&rqe->b, 0);
 460 }
 461
 462 /* Local Variables: */
 463 /* fill-column: 50 */
 464 /* End: */