sys/dev/raid/vinum/vinumio.c

   1 /*-
   2  * Copyright (c) 1997, 1998
   3  *      Nan Yang Computer Services Limited.  All rights reserved.
   4  *
   5  *  This software is distributed under the so-called ``Berkeley
   6  *  License'':
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by Nan Yang Computer
  19  *      Services Limited.
  20  * 4. Neither the name of the Company nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * This software is provided ``as is'', and any express or implied
  25  * warranties, including, but not limited to, the implied warranties of
  26  * merchantability and fitness for a particular purpose are disclaimed.
  27  * In no event shall the company or contributors be liable for any
  28  * direct, indirect, incidental, special, exemplary, or consequential
  29  * damages (including, but not limited to, procurement of substitute
  30  * goods or services; loss of use, data, or profits; or business
  31  * interruption) however caused and on any theory of liability, whether
  32  * in contract, strict liability, or tort (including negligence or
  33  * otherwise) arising in any way out of the use of this software, even if
  34  * advised of the possibility of such damage.
  35  *
  36  * $Id: vinumio.c,v 1.30 2000/05/10 23:23:30 grog Exp grog $
  37  * $FreeBSD: src/sys/dev/vinum/vinumio.c,v 1.52.2.6 2002/05/02 08:43:44 grog Exp $
  38  * $DragonFly: src/sys/dev/raid/vinum/vinumio.c,v 1.31 2008/06/05 18:06:31 swildner Exp $
  39  */
  40
  41 #include "vinumhdr.h"
  42 #include "request.h"
  43 #include <vm/vm_zone.h>
  44 #include <sys/nlookup.h>
  45
  46 static char *sappend(char *txt, char *s);
  47 static int drivecmp(const void *va, const void *vb);
  48
  49 /*
  50  * Open the device associated with the drive, and set drive's vp.
  51  * Return an error number
  52  */
  53 int
  54 open_drive(struct drive *drive, struct proc *p, int verbose)
  55 {
  56     struct nlookupdata nd;
  57     int error;
  58     const char *dname;
  59
  60     /*
  61      * Fail if already open
  62      */
  63     if (drive->flags & VF_OPEN)
  64         return EBUSY;
  65     dname = drive->devicename;
  66
  67     if (rootdev) {
  68         /*
  69          * Open via filesystem (future)
  70          */
  71         error = nlookup_init(&nd, drive->devicename, UIO_SYSSPACE, NLC_FOLLOW);
  72         if (error)
  73             return error;
  74         error = vn_open(&nd, NULL, FREAD|FWRITE, 0);
  75         drive->vp = nd.nl_open_vp;
  76         nd.nl_open_vp = NULL;
  77         nlookup_done(&nd);
  78     } else {
  79         /*
  80          * Open via synthesized vnode backed by disk device
  81          */
  82         error = vn_opendisk(drive->devicename, FREAD|FWRITE, &drive->vp);
  83         if (error)
  84             return error;
  85     }
  86
  87     if (error == 0 && drive->vp == NULL)
  88         error = ENODEV;
  89
  90     /*
  91      * A huge amount of pollution all over vinum requires that our low
  92      * level drive be a device.
  93      */
  94     if (error == 0 && drive->vp->v_type != VCHR) {
  95         vn_close(drive->vp, FREAD|FWRITE);
  96         drive->vp = NULL;
  97         error = ENODEV;
  98     }
  99     if (error) {
 100         drive->state = drive_down;
 101         if (verbose) {
 102             log(LOG_WARNING,
 103                 "vinum open_drive %s: failed with error %d\n",
 104                 drive->devicename, error);
 105         }
 106     } else {
 107         drive->dev = drive->vp->v_rdev;
 108         drive->flags |= VF_OPEN;
 109     }
 110     drive->lasterror = error;
 111     return error;
 112 }
 113
 114 /*
 115  * Set some variables in the drive struct
 116  * in more convenient form.  Return error indication
 117  */
 118 int
 119 set_drive_parms(struct drive *drive)
 120 {
 121     drive->blocksize = BLKDEV_IOSIZE;                       /* do we need this? */
 122     drive->secsperblock = drive->blocksize                  /* number of sectors per block */
 123         / drive->partinfo.media_blksize;
 124
 125     /* Now update the label part */
 126     bcopy(hostname, drive->label.sysname, VINUMHOSTNAMELEN); /* put in host name */
 127     getmicrotime(&drive->label.date_of_birth);              /* and current time */
 128     drive->label.drive_size = drive->partinfo.media_size;
 129 #if VINUMDEBUG
 130     if (debug & DEBUG_BIGDRIVE)                             /* pretend we're 100 times as big */
 131         drive->label.drive_size *= 100;
 132 #endif
 133
 134     /* number of sectors available for subdisks */
 135     drive->sectors_available = drive->label.drive_size / DEV_BSIZE - DATASTART;
 136
 137     /*
 138      * Bug in 3.0 as of January 1998: you can open
 139      * non-existent slices.  They have a length of 0.
 140      */
 141     if (drive->label.drive_size < MINVINUMSLICE) {          /* too small to worry about */
 142         set_drive_state(drive->driveno, drive_down, setstate_force);
 143         drive->lasterror = ENOSPC;
 144         return ENOSPC;
 145     }
 146     drive->freelist_size = INITIAL_DRIVE_FREELIST;          /* initial number of entries */
 147     drive->freelist = (struct drive_freelist *)
 148         Malloc(INITIAL_DRIVE_FREELIST * sizeof(struct drive_freelist));
 149     if (drive->freelist == NULL)                            /* can't malloc, dammit */
 150         return ENOSPC;
 151     drive->freelist_entries = 1;                            /* just (almost) the complete drive */
 152     drive->freelist[0].offset = DATASTART;                  /* starts here */
 153     drive->freelist[0].sectors = (drive->label.drive_size >> DEV_BSHIFT) - DATASTART; /* and it's this long */
 154     if (drive->label.name[0] != '\0')                       /* got a name */
 155         set_drive_state(drive->driveno, drive_up, setstate_force); /* our drive is accessible */
 156     else                                                    /* we know about it, but that's all */
 157         drive->state = drive_referenced;
 158     return 0;
 159 }
 160
 161 /*
 162  * Initialize a drive: open the device and add device
 163  * information
 164  */
 165 int
 166 init_drive(struct drive *drive, int verbose)
 167 {
 168     if (drive->devicename[0] != '/') {
 169         drive->lasterror = EINVAL;
 170         log(LOG_ERR, "vinum: Can't open drive without drive name (%s)\n",
 171             drive->devicename);
 172         return EINVAL;
 173     }
 174     drive->lasterror = open_drive(drive, curproc, verbose); /* open the drive */
 175     if (drive->lasterror)
 176         return drive->lasterror;
 177
 178     drive->lasterror = VOP_IOCTL(drive->vp, DIOCGPART,
 179                                  (caddr_t)&drive->partinfo, FREAD|FWRITE,
 180                                  proc0.p_ucred, NULL);
 181     if (drive->lasterror) {
 182         if (verbose)
 183             log(LOG_WARNING,
 184                 "vinum open_drive %s: Can't get partition information, drive->lasterror %d\n",
 185                 drive->devicename,
 186                 drive->lasterror);
 187         close_drive(drive);
 188         return drive->lasterror;
 189     }
 190     if (drive->partinfo.fstype != FS_VINUM &&
 191         !kuuid_is_vinum(&drive->partinfo.fstype_uuid)
 192     ) {
 193         drive->lasterror = EFTYPE;
 194         if (verbose)
 195             log(LOG_WARNING,
 196                 "vinum open_drive %s: Wrong partition type for vinum\n",
 197                 drive->devicename);
 198         close_drive(drive);
 199         return EFTYPE;
 200     }
 201     return set_drive_parms(drive);                          /* set various odds and ends */
 202 }
 203
 204 /* Close a drive if it's open. */
 205 void
 206 close_drive(struct drive *drive)
 207 {
 208     LOCKDRIVE(drive);                                       /* keep the daemon out */
 209     if (drive->flags & VF_OPEN)
 210         close_locked_drive(drive);                          /* and close it */
 211     if (drive->state > drive_down)                          /* if it's up */
 212         drive->state = drive_down;                          /* make sure it's down */
 213     unlockdrive(drive);
 214 }
 215
 216 /*
 217  * Real drive close code, called with drive already locked.
 218  * We have also checked that the drive is open.  No errors.
 219  */
 220 void
 221 close_locked_drive(struct drive *drive)
 222 {
 223     /*
 224      * If we can't access the drive, we can't flush
 225      * the queues, which spec_close() will try to
 226      * do.  Get rid of them here first.
 227      */
 228     if (drive->vp) {
 229         drive->lasterror = vn_close(drive->vp, FREAD|FWRITE);
 230         drive->vp = NULL;
 231     }
 232     drive->flags &= ~VF_OPEN;
 233 }
 234
 235 /*
 236  * Remove drive from the configuration.
 237  * Caller must ensure that it isn't active.
 238  */
 239 void
 240 remove_drive(int driveno)
 241 {
 242     struct drive *drive = &vinum_conf.drive[driveno];
 243     struct vinum_hdr *vhdr;                                 /* buffer for header */
 244     int error;
 245
 246     if (drive->state > drive_referenced) {                  /* real drive */
 247         if (drive->state == drive_up) {
 248             vhdr = (struct vinum_hdr *) Malloc(VINUMHEADERLEN); /* allocate buffer */
 249             CHECKALLOC(vhdr, "Can't allocate memory");
 250             error = read_drive(drive, (void *) vhdr, VINUMHEADERLEN, VINUM_LABEL_OFFSET);
 251             if (error)
 252                 drive->lasterror = error;
 253             else {
 254                 vhdr->magic = VINUM_NOMAGIC;                /* obliterate the magic, but leave the rest */
 255                 write_drive(drive, (void *) vhdr, VINUMHEADERLEN, VINUM_LABEL_OFFSET);
 256             }
 257             Free(vhdr);
 258         }
 259         free_drive(drive);                                  /* close it and free resources */
 260         save_config();                                      /* and save the updated configuration */
 261     }
 262 }
 263
 264 /*
 265  * Transfer drive data.  Usually called from one of these defines;
 266  * #define read_drive(a, b, c, d) driveio (a, b, c, d, BUF_CMD_READ)
 267  * #define write_drive(a, b, c, d) driveio (a, b, c, d, BUF_CMD_WRITE)
 268  *
 269  * length and offset are in bytes, but must be multiples of sector
 270  * size.  The function *does not check* for this condition, and
 271  * truncates ruthlessly.
 272  * Return error number
 273  */
 274 int
 275 driveio(struct drive *drive, char *buf, size_t length, off_t offset, buf_cmd_t cmd)
 276 {
 277     int error;
 278     struct buf *bp;
 279     caddr_t saveaddr;
 280
 281     error = 0;                                              /* to keep the compiler happy */
 282     while (length) {                                        /* divide into small enough blocks */
 283         int len = umin(length, MAXBSIZE);                   /* maximum block device transfer is MAXBSIZE */
 284
 285         bp = geteblk(len);                                  /* get a buffer header */
 286         bp->b_cmd = cmd;
 287         bp->b_bio1.bio_offset = offset;                     /* disk offset */
 288         bp->b_bio1.bio_done = biodone_sync;
 289         bp->b_bio1.bio_flags |= BIO_SYNC;
 290         saveaddr = bp->b_data;
 291         bp->b_data = buf;
 292         bp->b_bcount = len;
 293         vn_strategy(drive->vp, &bp->b_bio1);
 294         error = biowait(&bp->b_bio1, (cmd == BUF_CMD_READ ? "drvrd" : "drvwr"));
 295         bp->b_data = saveaddr;
 296         bp->b_flags |= B_INVAL | B_AGE;
 297         bp->b_flags &= ~B_ERROR;
 298         brelse(bp);
 299         if (error)
 300             break;
 301         length -= len;                                      /* update pointers */
 302         buf += len;
 303         offset += len;
 304     }
 305     return error;
 306 }
 307
 308 /*
 309  * Check a drive for a vinum header.  If found,
 310  * update the drive information.  We come here
 311  * with a partially populated drive structure
 312  * which includes the device name.
 313  *
 314  * Return information on what we found.
 315  *
 316  * This function is called from two places: check_drive,
 317  * which wants to find out whether the drive is a
 318  * Vinum drive, and config_drive, which asserts that
 319  * it is a vinum drive.  In the first case, we don't
 320  * print error messages (verbose==0), in the second
 321  * we do (verbose==1).
 322  */
 323 enum drive_label_info
 324 read_drive_label(struct drive *drive, int verbose)
 325 {
 326     int error;
 327     int result;
 328     struct vinum_hdr *vhdr;
 329
 330     error = init_drive(drive, verbose);                     /* find the drive */
 331     if (error)                                              /* find the drive */
 332         return DL_CANT_OPEN;                                /* not ours */
 333
 334     vhdr = (struct vinum_hdr *) Malloc(VINUMHEADERLEN);     /* allocate buffers */
 335     CHECKALLOC(vhdr, "Can't allocate memory");
 336
 337     drive->state = drive_up;                                /* be optimistic */
 338     error = read_drive(drive, (void *) vhdr, VINUMHEADERLEN, VINUM_LABEL_OFFSET);
 339     if (vhdr->magic == VINUM_MAGIC) {                       /* ours! */
 340         if (drive->label.name[0]                            /* we have a name for this drive */
 341         &&(strcmp(drive->label.name, vhdr->label.name))) {  /* but it doesn't match the real name */
 342             drive->lasterror = EINVAL;
 343             result = DL_WRONG_DRIVE;                        /* it's the wrong drive */
 344             drive->state = drive_unallocated;               /* put it back, it's not ours */
 345         } else
 346             result = DL_OURS;
 347         /*
 348          * We copy the drive anyway so that we have
 349          * the correct name in the drive info.  This
 350          * may not be the name specified
 351          */
 352         drive->label = vhdr->label;                         /* put in the label information */
 353     } else if (vhdr->magic == VINUM_NOMAGIC)                /* was ours, but we gave it away */
 354         result = DL_DELETED_LABEL;                          /* and return the info */
 355     else
 356         result = DL_NOT_OURS;                               /* we could have it, but we don't yet */
 357     Free(vhdr);                                             /* that's all. */
 358     return result;
 359 }
 360
 361 /*
 362  * Check a drive for a vinum header.  If found,
 363  * read configuration information from the drive and
 364  * incorporate the data into the configuration.
 365  *
 366  * Return drive number.
 367  */
 368 struct drive *
 369 check_drive(char *devicename)
 370 {
 371     int driveno;
 372     int i;
 373     struct drive *drive;
 374
 375     driveno = find_drive_by_dev(devicename, 1);             /* if entry doesn't exist, create it */
 376     drive = &vinum_conf.drive[driveno];                     /* and get a pointer */
 377
 378     if (read_drive_label(drive, 0) == DL_OURS) {            /* one of ours */
 379         for (i = 0; i < vinum_conf.drives_allocated; i++) { /* see if the name already exists */
 380             if ((i != driveno)                              /* not this drive */
 381             &&(DRIVE[i].state != drive_unallocated)         /* and it's allocated */
 382             &&(strcmp(DRIVE[i].label.name,
 383                         DRIVE[driveno].label.name) == 0)) { /* and it has the same name */
 384                 struct drive *mydrive = &DRIVE[i];
 385
 386                 if (mydrive->devicename[0] == '/') {        /* we know a device name for it */
 387                     /*
 388                      * set an error, but don't take the
 389                      * drive down: that would cause unneeded
 390                      * error messages.
 391                      */
 392                     drive->lasterror = EEXIST;
 393                     break;
 394                 } else {                                    /* it's just a place holder, */
 395                     int sdno;
 396
 397                     for (sdno = 0; sdno < vinum_conf.subdisks_allocated; sdno++) { /* look at each subdisk */
 398                         if ((SD[sdno].driveno == i)         /* it's pointing to this one, */
 399                         &&(SD[sdno].state != sd_unallocated)) { /* and it's a real subdisk */
 400                             SD[sdno].driveno = drive->driveno; /* point to the one we found */
 401                             update_sd_state(sdno);          /* and update its state */
 402                         }
 403                     }
 404                     bzero(mydrive, sizeof(struct drive));   /* don't deallocate it, just remove it */
 405                 }
 406             }
 407         }
 408     } else {
 409         if (drive->lasterror == 0)
 410             drive->lasterror = ENODEV;
 411         close_drive(drive);
 412         drive->state = drive_down;
 413     }
 414     return drive;
 415 }
 416
 417 static char *
 418 sappend(char *txt, char *s)
 419 {
 420     while ((*s++ = *txt++) != 0);
 421     return s - 1;
 422 }
 423
 424 void
 425 format_config(char *config, int len)
 426 {
 427     int i;
 428     int j;
 429     char *s = config;
 430     char *configend = &config[len];
 431
 432     bzero(config, len);
 433
 434     /* First write the volume configuration */
 435     for (i = 0; i < vinum_conf.volumes_allocated; i++) {
 436         struct volume *vol;
 437
 438         vol = &vinum_conf.volume[i];
 439         if ((vol->state > volume_uninit)
 440             && (vol->name[0] != '\0')) {                    /* paranoia */
 441             ksnprintf(s,
 442                 configend - s,
 443                 "volume %s state %s",
 444                 vol->name,
 445                 volume_state(vol->state));
 446             while (*s)
 447                 s++;                                        /* find the end */
 448             if (vol->preferred_plex >= 0)                   /* preferences, */
 449                 ksnprintf(s,
 450                     configend - s,
 451                     " readpol prefer %s",
 452                     vinum_conf.plex[vol->preferred_plex].name);
 453             while (*s)
 454                 s++;                                        /* find the end */
 455             s = sappend("\n", s);
 456         }
 457     }
 458
 459     /* Then the plex configuration */
 460     for (i = 0; i < vinum_conf.plexes_allocated; i++) {
 461         struct plex *plex;
 462
 463         plex = &vinum_conf.plex[i];
 464         if ((plex->state > plex_referenced)
 465             && (plex->name[0] != '\0')) {                   /* paranoia */
 466             ksnprintf(s,
 467                 configend - s,
 468                 "plex name %s state %s org %s ",
 469                 plex->name,
 470                 plex_state(plex->state),
 471                 plex_org(plex->organization));
 472             while (*s)
 473                 s++;                                        /* find the end */
 474             if (isstriped(plex)) {
 475                 ksnprintf(s,
 476                     configend - s,
 477                     "%ds ",
 478                     (int) plex->stripesize);
 479                 while (*s)
 480                     s++;                                    /* find the end */
 481             }
 482             if (plex->volno >= 0)                           /* we have a volume */
 483                 ksnprintf(s,
 484                     configend - s,
 485                     "vol %s ",
 486                     vinum_conf.volume[plex->volno].name);
 487             while (*s)
 488                 s++;                                        /* find the end */
 489             for (j = 0; j < plex->subdisks; j++) {
 490                 ksnprintf(s,
 491                     configend - s,
 492                     " sd %s",
 493                     vinum_conf.sd[plex->sdnos[j]].name);
 494             }
 495             s = sappend("\n", s);
 496         }
 497     }
 498
 499     /* And finally the subdisk configuration */
 500     for (i = 0; i < vinum_conf.subdisks_allocated; i++) {
 501         struct sd *sd;
 502         char *drivename;
 503
 504         sd = &SD[i];
 505         if ((sd->state != sd_referenced)
 506             && (sd->state != sd_unallocated)
 507             && (sd->name[0] != '\0')) {                     /* paranoia */
 508             drivename = vinum_conf.drive[sd->driveno].label.name;
 509             /*
 510              * XXX We've seen cases of dead subdisks
 511              * which don't have a drive.  If we let them
 512              * through here, the drive name is null, so
 513              * they get the drive named 'plex'.
 514              *
 515              * This is a breakage limiter, not a fix.
 516              */
 517             if (drivename[0] == '\0')
 518                 drivename = "*invalid*";
 519             ksnprintf(s,
 520                 configend - s,
 521                 "sd name %s drive %s plex %s len %llus driveoffset %llus state %s",
 522                 sd->name,
 523                 drivename,
 524                 vinum_conf.plex[sd->plexno].name,
 525                 (unsigned long long) sd->sectors,
 526                 (unsigned long long) sd->driveoffset,
 527                 sd_state(sd->state));
 528             while (*s)
 529                 s++;                                        /* find the end */
 530             if (sd->plexno >= 0)
 531                 ksnprintf(s,
 532                     configend - s,
 533                     " plexoffset %llds",
 534                     (long long) sd->plexoffset);
 535             else
 536                 ksnprintf(s, configend - s, " detached");
 537             while (*s)
 538                 s++;                                        /* find the end */
 539             if (sd->flags & VF_RETRYERRORS) {
 540                 ksnprintf(s, configend - s, " retryerrors");
 541                 while (*s)
 542                     s++;                                    /* find the end */
 543             }
 544             ksnprintf(s, configend - s, " \n");
 545             while (*s)
 546                 s++;                                        /* find the end */
 547         }
 548     }
 549     if (s > &config[len - 2])
 550         panic("vinum: configuration data overflow");
 551 }
 552
 553 /*
 554  * issue a save config request to the dæmon.  The actual work
 555  * is done in process context by daemon_save_config
 556  */
 557 void
 558 save_config(void)
 559 {
 560     queue_daemon_request(daemonrq_saveconfig, (union daemoninfo) 0);
 561 }
 562
 563 /*
 564  * Write the configuration to all vinum slices.  This
 565  * is performed by the dæmon only
 566  */
 567 void
 568 daemon_save_config(void)
 569 {
 570     int error;
 571     int written_config;                                     /* set when we first write the config to disk */
 572     int driveno;
 573     struct drive *drive;                                    /* point to current drive info */
 574     struct vinum_hdr *vhdr;                                 /* and as header */
 575     char *config;                                           /* point to config data */
 576     int wlabel_on;                                          /* to set writing label on/off */
 577
 578     /* don't save the configuration while we're still working on it */
 579     if (vinum_conf.flags & VF_CONFIGURING)
 580         return;
 581     written_config = 0;                                     /* no config written yet */
 582     /* Build a volume header */
 583     vhdr = (struct vinum_hdr *) Malloc(VINUMHEADERLEN);     /* get space for the config data */
 584     CHECKALLOC(vhdr, "Can't allocate config data");
 585     vhdr->magic = VINUM_MAGIC;                              /* magic number */
 586     vhdr->config_length = MAXCONFIG;                        /* length of following config info */
 587
 588     config = Malloc(MAXCONFIG);                             /* get space for the config data */
 589     CHECKALLOC(config, "Can't allocate config data");
 590
 591     format_config(config, MAXCONFIG);
 592     error = 0;                                              /* no errors yet */
 593     for (driveno = 0; driveno < vinum_conf.drives_allocated; driveno++) {
 594         drive = &vinum_conf.drive[driveno];                 /* point to drive */
 595         if (drive->state > drive_referenced) {
 596             LOCKDRIVE(drive);                               /* don't let it change */
 597
 598             /*
 599              * First, do some drive consistency checks.  Some
 600              * of these are kludges, others require a process
 601              * context and couldn't be done before
 602              */
 603             if ((drive->devicename[0] == '\0')
 604                 || (drive->label.name[0] == '\0')) {
 605                 unlockdrive(drive);
 606                 free_drive(drive);                          /* get rid of it */
 607                 break;
 608             }
 609             if (((drive->flags & VF_OPEN) == 0)             /* drive not open */
 610             &&(drive->state > drive_down)) {                /* and it thinks it's not down */
 611                 unlockdrive(drive);
 612                 set_drive_state(driveno, drive_down, setstate_force); /* tell it what's what */
 613                 continue;
 614             }
 615             if ((drive->state == drive_down)                /* it's down */
 616             &&(drive->flags & VF_OPEN)) {                   /* but open, */
 617                 unlockdrive(drive);
 618                 close_drive(drive);                         /* close it */
 619             } else if (drive->state > drive_down) {
 620                 getmicrotime(&drive->label.last_update);    /* time of last update is now */
 621                 bcopy((char *) &drive->label,               /* and the label info from the drive structure */
 622                     (char *) &vhdr->label,
 623                     sizeof(vhdr->label));
 624                 if ((drive->state != drive_unallocated)
 625                     && (drive->state != drive_referenced)) { /* and it's a real drive */
 626                     wlabel_on = 1;                          /* enable writing the label */
 627                     error = 0;
 628 #if 1
 629                     error = VOP_IOCTL(drive->vp, DIOCWLABEL,
 630                                       (caddr_t)&wlabel_on, FREAD|FWRITE,
 631                                       proc0.p_ucred, NULL);
 632 #endif
 633                     if (error == 0)
 634                         error = write_drive(drive, (char *) vhdr, VINUMHEADERLEN, VINUM_LABEL_OFFSET);
 635                     if (error == 0)
 636                         error = write_drive(drive, config, MAXCONFIG, VINUM_CONFIG_OFFSET); /* first config copy */
 637                     if (error == 0)
 638                         error = write_drive(drive, config, MAXCONFIG, VINUM_CONFIG_OFFSET + MAXCONFIG); /* second copy */
 639                     wlabel_on = 0;                          /* enable writing the label */
 640 #if 1
 641                     if (error == 0) {
 642                         error = VOP_IOCTL(drive->vp, DIOCWLABEL,
 643                                           (caddr_t)&wlabel_on, FREAD|FWRITE,
 644                                           proc0.p_ucred, NULL);
 645                     }
 646 #endif
 647                     unlockdrive(drive);
 648                     if (error) {
 649                         log(LOG_ERR,
 650                             "vinum: Can't write config to %s, error %d\n",
 651                             drive->devicename,
 652                             error);
 653                         set_drive_state(drive->driveno, drive_down, setstate_force);
 654                     } else
 655                         written_config = 1;                 /* we've written it on at least one drive */
 656                 }
 657             } else                                          /* not worth looking at, */
 658                 unlockdrive(drive);                         /* just unlock it again */
 659         }
 660     }
 661     Free(vhdr);
 662     Free(config);
 663 }
 664
 665 /* Look at all disks on the system for vinum slices */
 666 int
 667 vinum_scandisk(char *devicename[], int drives)
 668 {
 669     struct drive *volatile drive;
 670     volatile int driveno;
 671     int firstdrive;                                         /* first drive in this list */
 672     volatile int gooddrives;                                /* number of usable drives found */
 673     int firsttime;                                          /* set if we have never configured before */
 674     int error;
 675     char *config_text;                                      /* read the config info from disk into here */
 676     char *volatile cptr;                                    /* pointer into config information */
 677     char *eptr;                                             /* end pointer into config information */
 678     char *config_line;                                      /* copy the config line to */
 679     volatile int status;
 680     int *volatile drivelist;                                /* list of drive indices */
 681 #define DRIVENAMELEN 64
 682 #define DRIVEPARTS   35                                     /* max partitions per drive, excluding c */
 683     char partname[DRIVENAMELEN];                            /* for creating partition names */
 684
 685     status = 0;                                             /* success indication */
 686     vinum_conf.flags |= VF_READING_CONFIG;                  /* reading config from disk */
 687
 688     gooddrives = 0;                                         /* number of usable drives found */
 689     firstdrive = vinum_conf.drives_used;                    /* the first drive */
 690     firsttime = vinum_conf.drives_used == 0;                /* are we a virgin? */
 691
 692     /* allocate a drive pointer list */
 693     drivelist = (int *) Malloc(drives * DRIVEPARTS * sizeof(int));
 694     CHECKALLOC(drivelist, "Can't allocate memory");
 695     error = setjmp(command_fail);                           /* come back here on error */
 696     if (error) {                                            /* longjmped out */
 697         return error;
 698     }
 699
 700     /* Open all drives and find which was modified most recently */
 701     for (driveno = 0; driveno < drives; driveno++) {
 702         char part, has_part = 0;                            /* UNIX partition */
 703         int slice;
 704         int founddrive;                                     /* flag when we find a vinum drive */
 705         int has_slice = -1;
 706         char *tmp;
 707
 708         founddrive = 0;                                     /* no vinum drive found yet on this spindle */
 709
 710         /*
 711          * If the device path contains a slice we do not try to tack on
 712          * another slice.  If the device path has a partition we only check
 713          * that partition.
 714          */
 715         if ((tmp = rindex(devicename[driveno], '/')) == NULL)
 716             tmp = devicename[driveno];
 717         else
 718                 tmp++;
 719         ksscanf(tmp, "%*[a-z]%*d%*[s]%d%c", &has_slice, &has_part);
 720
 721         for (slice = 0; slice < MAX_SLICES; slice++) {
 722             if (has_slice >= 0 && slice != has_slice)
 723                 continue;
 724
 725             for (part = 'a'; part < 'a' + MAXPARTITIONS; part++) {
 726                 if (part == 'c')
 727                     continue;
 728                 if (has_part && part != has_part)
 729                     continue;
 730                 if (has_slice >= 0 && has_part)
 731                         strncpy(partname, devicename[driveno], DRIVENAMELEN);
 732                 else if (has_slice >= 0)
 733                         ksnprintf(partname, DRIVENAMELEN,
 734                                 "%s%c", devicename[driveno], part);
 735                 else
 736                         ksnprintf(partname, DRIVENAMELEN,
 737                                 "%ss%d%c", devicename[driveno], slice, part);
 738                 drive = check_drive(partname);      /* try to open it */
 739                 if ((drive->lasterror != 0)                 /* didn't work, */
 740                     ||(drive->state != drive_up))
 741                     free_drive(drive);              /* get rid of it */
 742                 else if (drive->flags & VF_CONFIGURED)  /* already read this config, */
 743                     log(LOG_WARNING,
 744                         "vinum: already read config from %s\n", /* say so */
 745                         drive->label.name);
 746                 else {
 747                     drivelist[gooddrives] = drive->driveno;     /* keep the drive index */
 748                     drive->flags &= ~VF_NEWBORN;            /* which is no longer newly born */
 749                     gooddrives++;
 750                     founddrive++;
 751                 }
 752             }
 753         }
 754     }
 755
 756     if (gooddrives == 0) {
 757         if (firsttime)
 758             log(LOG_WARNING, "vinum: no drives found\n");
 759         else
 760             log(LOG_INFO, "vinum: no additional drives found\n");
 761         return ENOENT;
 762     }
 763     /*
 764      * We now have at least one drive
 765      * open.  Sort them in order of config time
 766      * and merge the config info with what we
 767      * have already.
 768      */
 769     kqsort(drivelist, gooddrives, sizeof(int), drivecmp);
 770     config_text = (char *) Malloc(MAXCONFIG * 2);           /* allocate buffers */
 771     CHECKALLOC(config_text, "Can't allocate memory");
 772     config_line = (char *) Malloc(MAXCONFIGLINE * 2);       /* allocate buffers */
 773     CHECKALLOC(config_line, "Can't allocate memory");
 774     for (driveno = 0; driveno < gooddrives; driveno++) {    /* now include the config */
 775         drive = &DRIVE[drivelist[driveno]];                 /* point to the drive */
 776
 777         if (firsttime && (driveno == 0))                    /* we've never configured before, */
 778             log(LOG_INFO, "vinum: reading configuration from %s\n", drive->devicename);
 779         else
 780             log(LOG_INFO, "vinum: updating configuration from %s\n", drive->devicename);
 781
 782         if (drive->state == drive_up)
 783             /* Read in both copies of the configuration information */
 784             error = read_drive(drive, config_text, MAXCONFIG * 2, VINUM_CONFIG_OFFSET);
 785         else {
 786             error = EIO;
 787             kprintf("vinum_scandisk: %s is %s\n", drive->devicename, drive_state(drive->state));
 788         }
 789
 790         if (error != 0) {
 791             log(LOG_ERR, "vinum: Can't read device %s, error %d\n", drive->devicename, error);
 792             free_drive(drive);                              /* give it back */
 793             status = error;
 794         }
 795         /*
 796          * At this point, check that the two copies
 797          * are the same, and do something useful if
 798          * not.  In particular, consider which is
 799          * newer, and what this means for the
 800          * integrity of the data on the drive.
 801          */
 802         else {
 803             vinum_conf.drives_used++;                       /* another drive in use */
 804             /* Parse the configuration, and add it to the global configuration */
 805             for (cptr = config_text; *cptr != '\0';) {      /* love this style(9) */
 806                 volatile int parse_status;                  /* return value from parse_config */
 807
 808                 for (eptr = config_line; (*cptr != '\n') && (*cptr != '\0');) /* until the end of the line */
 809                     *eptr++ = *cptr++;
 810                 *eptr = '\0';                               /* and delimit */
 811                 if (setjmp(command_fail) == 0) {            /* come back here on error and continue */
 812                     parse_status = parse_config(config_line, &keyword_set, 1); /* parse the config line */
 813                     if (parse_status < 0) {                 /* error in config */
 814                         /*
 815                            * This config should have been parsed in user
 816                            * space.  If we run into problems here, something
 817                            * serious is afoot.  Complain and let the user
 818                            * snarf the config to see what's wrong.
 819                          */
 820                         log(LOG_ERR,
 821                             "vinum: Config error on %s, aborting integration\n",
 822                             drive->devicename);
 823                         free_drive(drive);                  /* give it back */
 824                         status = EINVAL;
 825                     }
 826                 }
 827                 while (*cptr == '\n')
 828                     cptr++;                                 /* skip to next line */
 829             }
 830         }
 831         drive->flags |= VF_CONFIGURED;                      /* read this drive's configuration */
 832     }
 833
 834     Free(config_line);
 835     Free(config_text);
 836     Free(drivelist);
 837     vinum_conf.flags &= ~VF_READING_CONFIG;                 /* no longer reading from disk */
 838     if (status != 0)
 839         kprintf("vinum: couldn't read configuration");
 840     else
 841         updateconfig(VF_READING_CONFIG);                    /* update from disk config */
 842     return status;
 843 }
 844
 845 /*
 846  * Compare the modification dates of the drives, for qsort.
 847  * Return 1 if a < b, 0 if a == b, 01 if a > b: in other
 848  * words, sort backwards.
 849  */
 850 int
 851 drivecmp(const void *va, const void *vb)
 852 {
 853     const struct drive *a = &DRIVE[*(const int *) va];
 854     const struct drive *b = &DRIVE[*(const int *) vb];
 855
 856     if ((a->label.last_update.tv_sec == b->label.last_update.tv_sec)
 857         && (a->label.last_update.tv_usec == b->label.last_update.tv_usec))
 858         return 0;
 859     else if ((a->label.last_update.tv_sec > b->label.last_update.tv_sec)
 860             || ((a->label.last_update.tv_sec == b->label.last_update.tv_sec)
 861             && (a->label.last_update.tv_usec > b->label.last_update.tv_usec)))
 862         return -1;
 863     else
 864         return 1;
 865 }
 866 /* Local Variables: */
 867 /* fill-column: 50 */
 868 /* End: */