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