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     /*
  68      * Severe hack to disallow opening partition 'c'
  69      */
  70     if (strncmp(dname, "/dev", 4) == 0 && dname[strlen(dname)-1] == 'c')
  71         return ENOTTY;
  72
  73     if (rootdev) {
  74         /*
  75          * Open via filesystem (future)
  76          */
  77         error = nlookup_init(&nd, drive->devicename, UIO_SYSSPACE, NLC_FOLLOW);
  78         if (error)
  79             return error;
  80         error = vn_open(&nd, NULL, FREAD|FWRITE, 0);
  81         drive->vp = nd.nl_open_vp;
  82         nd.nl_open_vp = NULL;
  83         nlookup_done(&nd);
  84     } else {
  85         /*
  86          * Open via synthesized vnode backed by disk device
  87          */
  88         error = vn_opendisk(drive->devicename, FREAD|FWRITE, &drive->vp);
  89         if (error)
  90             return error;
  91     }
  92
  93     if (error == 0 && drive->vp == NULL)
  94         error = ENODEV;
  95
  96     /*
  97      * A huge amount of pollution all over vinum requires that our low
  98      * level drive be a device.
  99      */
 100     if (error == 0 && drive->vp->v_type != VCHR) {
 101         vn_close(drive->vp, FREAD|FWRITE);
 102         drive->vp = NULL;
 103         error = ENODEV;
 104     }
 105     if (error) {
 106         drive->state = drive_down;
 107         if (verbose) {
 108             log(LOG_WARNING,
 109                 "vinum open_drive %s: failed with error %d\n",
 110                 drive->devicename, error);
 111         }
 112     } else {
 113         drive->dev = drive->vp->v_rdev;
 114         drive->flags |= VF_OPEN;
 115     }
 116     drive->lasterror = error;
 117     return error;
 118 }
 119
 120 /*
 121  * Set some variables in the drive struct
 122  * in more convenient form.  Return error indication
 123  */
 124 int
 125 set_drive_parms(struct drive *drive)
 126 {
 127     drive->blocksize = BLKDEV_IOSIZE;                       /* do we need this? */
 128     drive->secsperblock = drive->blocksize                  /* number of sectors per block */
 129         / drive->partinfo.media_blksize;
 130
 131     /* Now update the label part */
 132     bcopy(hostname, drive->label.sysname, VINUMHOSTNAMELEN); /* put in host name */
 133     getmicrotime(&drive->label.date_of_birth);              /* and current time */
 134     drive->label.drive_size = drive->partinfo.media_size;
 135 #if VINUMDEBUG
 136     if (debug & DEBUG_BIGDRIVE)                             /* pretend we're 100 times as big */
 137         drive->label.drive_size *= 100;
 138 #endif
 139
 140     /* number of sectors available for subdisks */
 141     drive->sectors_available = drive->label.drive_size / DEV_BSIZE - DATASTART;
 142
 143     /*
 144      * Bug in 3.0 as of January 1998: you can open
 145      * non-existent slices.  They have a length of 0.
 146      */
 147     if (drive->label.drive_size < MINVINUMSLICE) {          /* too small to worry about */
 148         set_drive_state(drive->driveno, drive_down, setstate_force);
 149         drive->lasterror = ENOSPC;
 150         return ENOSPC;
 151     }
 152     drive->freelist_size = INITIAL_DRIVE_FREELIST;          /* initial number of entries */
 153     drive->freelist = (struct drive_freelist *)
 154         Malloc(INITIAL_DRIVE_FREELIST * sizeof(struct drive_freelist));
 155     if (drive->freelist == NULL)                            /* can't malloc, dammit */
 156         return ENOSPC;
 157     drive->freelist_entries = 1;                            /* just (almost) the complete drive */
 158     drive->freelist[0].offset = DATASTART;                  /* starts here */
 159     drive->freelist[0].sectors = (drive->label.drive_size >> DEV_BSHIFT) - DATASTART; /* and it's this long */
 160     if (drive->label.name[0] != '\0')                       /* got a name */
 161         set_drive_state(drive->driveno, drive_up, setstate_force); /* our drive is accessible */
 162     else                                                    /* we know about it, but that's all */
 163         drive->state = drive_referenced;
 164     return 0;
 165 }
 166
 167 /*
 168  * Initialize a drive: open the device and add device
 169  * information
 170  */
 171 int
 172 init_drive(struct drive *drive, int verbose)
 173 {
 174     if (drive->devicename[0] != '/') {
 175         drive->lasterror = EINVAL;
 176         log(LOG_ERR, "vinum: Can't open drive without drive name\n");
 177         return EINVAL;
 178     }
 179     drive->lasterror = open_drive(drive, curproc, verbose); /* open the drive */
 180     if (drive->lasterror)
 181         return drive->lasterror;
 182
 183     drive->lasterror = VOP_IOCTL(drive->vp, DIOCGPART,
 184                                  (caddr_t)&drive->partinfo,
 185                                  FREAD|FWRITE, proc0.p_ucred);
 186     if (drive->lasterror) {
 187         if (verbose)
 188             log(LOG_WARNING,
 189                 "vinum open_drive %s: Can't get partition information, drive->lasterror %d\n",
 190                 drive->devicename,
 191                 drive->lasterror);
 192         close_drive(drive);
 193         return drive->lasterror;
 194     }
 195     if (drive->partinfo.fstype != FS_VINUM &&
 196         !kuuid_is_vinum(&drive->partinfo.fstype_uuid)
 197     ) {
 198         drive->lasterror = EFTYPE;
 199         if (verbose)
 200             log(LOG_WARNING,
 201                 "vinum open_drive %s: Wrong partition type for vinum\n",
 202                 drive->devicename);
 203         close_drive(drive);
 204         return EFTYPE;
 205     }
 206     return set_drive_parms(drive);                          /* set various odds and ends */
 207 }
 208
 209 /* Close a drive if it's open. */
 210 void
 211 close_drive(struct drive *drive)
 212 {
 213     LOCKDRIVE(drive);                                       /* keep the daemon out */
 214     if (drive->flags & VF_OPEN)
 215         close_locked_drive(drive);                          /* and close it */
 216     if (drive->state > drive_down)                          /* if it's up */
 217         drive->state = drive_down;                          /* make sure it's down */
 218     unlockdrive(drive);
 219 }
 220
 221 /*
 222  * Real drive close code, called with drive already locked.
 223  * We have also checked that the drive is open.  No errors.
 224  */
 225 void
 226 close_locked_drive(struct drive *drive)
 227 {
 228     /*
 229      * If we can't access the drive, we can't flush
 230      * the queues, which spec_close() will try to
 231      * do.  Get rid of them here first.
 232      */
 233     if (drive->vp) {
 234         drive->lasterror = vn_close(drive->vp, FREAD|FWRITE);
 235         drive->vp = NULL;
 236     }
 237     drive->flags &= ~VF_OPEN;
 238 }
 239
 240 /*
 241  * Remove drive from the configuration.
 242  * Caller must ensure that it isn't active.
 243  */
 244 void
 245 remove_drive(int driveno)
 246 {
 247     struct drive *drive = &vinum_conf.drive[driveno];
 248     struct vinum_hdr *vhdr;                                 /* buffer for header */
 249     int error;
 250
 251     if (drive->state > drive_referenced) {                  /* real drive */
 252         if (drive->state == drive_up) {
 253             vhdr = (struct vinum_hdr *) Malloc(VINUMHEADERLEN); /* allocate buffer */
 254             CHECKALLOC(vhdr, "Can't allocate memory");
 255             error = read_drive(drive, (void *) vhdr, VINUMHEADERLEN, VINUM_LABEL_OFFSET);
 256             if (error)
 257                 drive->lasterror = error;
 258             else {
 259                 vhdr->magic = VINUM_NOMAGIC;                /* obliterate the magic, but leave the rest */
 260                 write_drive(drive, (void *) vhdr, VINUMHEADERLEN, VINUM_LABEL_OFFSET);
 261             }
 262             Free(vhdr);
 263         }
 264         free_drive(drive);                                  /* close it and free resources */
 265         save_config();                                      /* and save the updated configuration */
 266     }
 267 }
 268
 269 /*
 270  * Transfer drive data.  Usually called from one of these defines;
 271  * #define read_drive(a, b, c, d) driveio (a, b, c, d, BUF_CMD_READ)
 272  * #define write_drive(a, b, c, d) driveio (a, b, c, d, BUF_CMD_WRITE)
 273  *
 274  * length and offset are in bytes, but must be multiples of sector
 275  * size.  The function *does not check* for this condition, and
 276  * truncates ruthlessly.
 277  * Return error number
 278  */
 279 int
 280 driveio(struct drive *drive, char *buf, size_t length, off_t offset, buf_cmd_t cmd)
 281 {
 282     int error;
 283     struct buf *bp;
 284     caddr_t saveaddr;
 285
 286     error = 0;                                              /* to keep the compiler happy */
 287     while (length) {                                        /* divide into small enough blocks */
 288         int len = min(length, MAXBSIZE);                    /* maximum block device transfer is MAXBSIZE */
 289
 290         bp = geteblk(len);                                  /* get a buffer header */
 291         bp->b_cmd = cmd;
 292         bp->b_bio1.bio_offset = offset;                     /* disk offset */
 293         saveaddr = bp->b_data;
 294         bp->b_data = buf;
 295         bp->b_bcount = len;
 296         vn_strategy(drive->vp, &bp->b_bio1);
 297         error = biowait(bp);
 298         bp->b_data = saveaddr;
 299         bp->b_flags |= B_INVAL | B_AGE;
 300         bp->b_flags &= ~B_ERROR;
 301         brelse(bp);
 302         if (error)
 303             break;
 304         length -= len;                                      /* update pointers */
 305         buf += len;
 306         offset += len;
 307     }
 308     return error;
 309 }
 310
 311 /*
 312  * Check a drive for a vinum header.  If found,
 313  * update the drive information.  We come here
 314  * with a partially populated drive structure
 315  * which includes the device name.
 316  *
 317  * Return information on what we found.
 318  *
 319  * This function is called from two places: check_drive,
 320  * which wants to find out whether the drive is a
 321  * Vinum drive, and config_drive, which asserts that
 322  * it is a vinum drive.  In the first case, we don't
 323  * print error messages (verbose==0), in the second
 324  * we do (verbose==1).
 325  */
 326 enum drive_label_info
 327 read_drive_label(struct drive *drive, int verbose)
 328 {
 329     int error;
 330     int result;                                             /* result of our search */
 331     struct vinum_hdr *vhdr;                                 /* and as header */
 332
 333     error = init_drive(drive, 0);                           /* find the drive */
 334     if (error)                                              /* find the drive */
 335         return DL_CANT_OPEN;                                /* not ours */
 336
 337     vhdr = (struct vinum_hdr *) Malloc(VINUMHEADERLEN);     /* allocate buffers */
 338     CHECKALLOC(vhdr, "Can't allocate memory");
 339
 340     drive->state = drive_up;                                /* be optimistic */
 341     error = read_drive(drive, (void *) vhdr, VINUMHEADERLEN, VINUM_LABEL_OFFSET);
 342     if (vhdr->magic == VINUM_MAGIC) {                       /* ours! */
 343         if (drive->label.name[0]                            /* we have a name for this drive */
 344         &&(strcmp(drive->label.name, vhdr->label.name))) {  /* but it doesn't match the real name */
 345             drive->lasterror = EINVAL;
 346             result = DL_WRONG_DRIVE;                        /* it's the wrong drive */
 347             drive->state = drive_unallocated;               /* put it back, it's not ours */
 348         } else
 349             result = DL_OURS;
 350         /*
 351          * We copy the drive anyway so that we have
 352          * the correct name in the drive info.  This
 353          * may not be the name specified
 354          */
 355         drive->label = vhdr->label;                         /* put in the label information */
 356     } else if (vhdr->magic == VINUM_NOMAGIC)                /* was ours, but we gave it away */
 357         result = DL_DELETED_LABEL;                          /* and return the info */
 358     else
 359         result = DL_NOT_OURS;                               /* we could have it, but we don't yet */
 360     Free(vhdr);                                             /* that's all. */
 361     return result;
 362 }
 363
 364 /*
 365  * Check a drive for a vinum header.  If found,
 366  * read configuration information from the drive and
 367  * incorporate the data into the configuration.
 368  *
 369  * Return drive number.
 370  */
 371 struct drive *
 372 check_drive(char *devicename)
 373 {
 374     int driveno;
 375     int i;
 376     struct drive *drive;
 377
 378     driveno = find_drive_by_dev(devicename, 1);             /* if entry doesn't exist, create it */
 379     drive = &vinum_conf.drive[driveno];                     /* and get a pointer */
 380
 381     if (read_drive_label(drive, 0) == DL_OURS) {            /* one of ours */
 382         for (i = 0; i < vinum_conf.drives_allocated; i++) { /* see if the name already exists */
 383             if ((i != driveno)                              /* not this drive */
 384             &&(DRIVE[i].state != drive_unallocated)         /* and it's allocated */
 385             &&(strcmp(DRIVE[i].label.name,
 386                         DRIVE[driveno].label.name) == 0)) { /* and it has the same name */
 387                 struct drive *mydrive = &DRIVE[i];
 388
 389                 if (mydrive->devicename[0] == '/') {        /* we know a device name for it */
 390                     /*
 391                      * set an error, but don't take the
 392                      * drive down: that would cause unneeded
 393                      * error messages.
 394                      */
 395                     drive->lasterror = EEXIST;
 396                     break;
 397                 } else {                                    /* it's just a place holder, */
 398                     int sdno;
 399
 400                     for (sdno = 0; sdno < vinum_conf.subdisks_allocated; sdno++) { /* look at each subdisk */
 401                         if ((SD[sdno].driveno == i)         /* it's pointing to this one, */
 402                         &&(SD[sdno].state != sd_unallocated)) { /* and it's a real subdisk */
 403                             SD[sdno].driveno = drive->driveno; /* point to the one we found */
 404                             update_sd_state(sdno);          /* and update its state */
 405                         }
 406                     }
 407                     bzero(mydrive, sizeof(struct drive));   /* don't deallocate it, just remove it */
 408                 }
 409             }
 410         }
 411     } else {
 412         if (drive->lasterror == 0)
 413             drive->lasterror = ENODEV;
 414         close_drive(drive);
 415         drive->state = drive_down;
 416     }
 417     return drive;
 418 }
 419
 420 static char *
 421 sappend(char *txt, char *s)
 422 {
 423     while ((*s++ = *txt++) != 0);
 424     return s - 1;
 425 }
 426
 427 void
 428 format_config(char *config, int len)
 429 {
 430     int i;
 431     int j;
 432     char *s = config;
 433     char *configend = &config[len];
 434
 435     bzero(config, len);
 436
 437     /* First write the volume configuration */
 438     for (i = 0; i < vinum_conf.volumes_allocated; i++) {
 439         struct volume *vol;
 440
 441         vol = &vinum_conf.volume[i];
 442         if ((vol->state > volume_uninit)
 443             && (vol->name[0] != '\0')) {                    /* paranoia */
 444             ksnprintf(s,
 445                 configend - s,
 446                 "volume %s state %s",
 447                 vol->name,
 448                 volume_state(vol->state));
 449             while (*s)
 450                 s++;                                        /* find the end */
 451             if (vol->preferred_plex >= 0)                   /* preferences, */
 452                 ksnprintf(s,
 453                     configend - s,
 454                     " readpol prefer %s",
 455                     vinum_conf.plex[vol->preferred_plex].name);
 456             while (*s)
 457                 s++;                                        /* find the end */
 458             s = sappend("\n", s);
 459         }
 460     }
 461
 462     /* Then the plex configuration */
 463     for (i = 0; i < vinum_conf.plexes_allocated; i++) {
 464         struct plex *plex;
 465
 466         plex = &vinum_conf.plex[i];
 467         if ((plex->state > plex_referenced)
 468             && (plex->name[0] != '\0')) {                   /* paranoia */
 469             ksnprintf(s,
 470                 configend - s,
 471                 "plex name %s state %s org %s ",
 472                 plex->name,
 473                 plex_state(plex->state),
 474                 plex_org(plex->organization));
 475             while (*s)
 476                 s++;                                        /* find the end */
 477             if (isstriped(plex)) {
 478                 ksnprintf(s,
 479                     configend - s,
 480                     "%ds ",
 481                     (int) plex->stripesize);
 482                 while (*s)
 483                     s++;                                    /* find the end */
 484             }
 485             if (plex->volno >= 0)                           /* we have a volume */
 486                 ksnprintf(s,
 487                     configend - s,
 488                     "vol %s ",
 489                     vinum_conf.volume[plex->volno].name);
 490             while (*s)
 491                 s++;                                        /* find the end */
 492             for (j = 0; j < plex->subdisks; j++) {
 493                 ksnprintf(s,
 494                     configend - s,
 495                     " sd %s",
 496                     vinum_conf.sd[plex->sdnos[j]].name);
 497             }
 498             s = sappend("\n", s);
 499         }
 500     }
 501
 502     /* And finally the subdisk configuration */
 503     for (i = 0; i < vinum_conf.subdisks_allocated; i++) {
 504         struct sd *sd;
 505         char *drivename;
 506
 507         sd = &SD[i];
 508         if ((sd->state != sd_referenced)
 509             && (sd->state != sd_unallocated)
 510             && (sd->name[0] != '\0')) {                     /* paranoia */
 511             drivename = vinum_conf.drive[sd->driveno].label.name;
 512             /*
 513              * XXX We've seen cases of dead subdisks
 514              * which don't have a drive.  If we let them
 515              * through here, the drive name is null, so
 516              * they get the drive named 'plex'.
 517              *
 518              * This is a breakage limiter, not a fix.
 519              */
 520             if (drivename[0] == '\0')
 521                 drivename = "*invalid*";
 522             ksnprintf(s,
 523                 configend - s,
 524                 "sd name %s drive %s plex %s len %llus driveoffset %llus state %s",
 525                 sd->name,
 526                 drivename,
 527                 vinum_conf.plex[sd->plexno].name,
 528                 (unsigned long long) sd->sectors,
 529                 (unsigned long long) sd->driveoffset,
 530                 sd_state(sd->state));
 531             while (*s)
 532                 s++;                                        /* find the end */
 533             if (sd->plexno >= 0)
 534                 ksnprintf(s,
 535                     configend - s,
 536                     " plexoffset %llds",
 537                     (long long) sd->plexoffset);
 538             else
 539                 ksnprintf(s, configend - s, " detached");
 540             while (*s)
 541                 s++;                                        /* find the end */
 542             if (sd->flags & VF_RETRYERRORS) {
 543                 ksnprintf(s, configend - s, " retryerrors");
 544                 while (*s)
 545                     s++;                                    /* find the end */
 546             }
 547             ksnprintf(s, configend - s, " \n");
 548             while (*s)
 549                 s++;                                        /* find the end */
 550         }
 551     }
 552     if (s > &config[len - 2])
 553         panic("vinum: configuration data overflow");
 554 }
 555
 556 /*
 557  * issue a save config request to the dæmon.  The actual work
 558  * is done in process context by daemon_save_config
 559  */
 560 void
 561 save_config(void)
 562 {
 563     queue_daemon_request(daemonrq_saveconfig, (union daemoninfo) 0);
 564 }
 565
 566 /*
 567  * Write the configuration to all vinum slices.  This
 568  * is performed by the dæmon only
 569  */
 570 void
 571 daemon_save_config(void)
 572 {
 573     int error;
 574     int written_config;                                     /* set when we first write the config to disk */
 575     int driveno;
 576     struct drive *drive;                                    /* point to current drive info */
 577     struct vinum_hdr *vhdr;                                 /* and as header */
 578     char *config;                                           /* point to config data */
 579     int wlabel_on;                                          /* to set writing label on/off */
 580
 581     /* don't save the configuration while we're still working on it */
 582     if (vinum_conf.flags & VF_CONFIGURING)
 583         return;
 584     written_config = 0;                                     /* no config written yet */
 585     /* Build a volume header */
 586     vhdr = (struct vinum_hdr *) Malloc(VINUMHEADERLEN);     /* get space for the config data */
 587     CHECKALLOC(vhdr, "Can't allocate config data");
 588     vhdr->magic = VINUM_MAGIC;                              /* magic number */
 589     vhdr->config_length = MAXCONFIG;                        /* length of following config info */
 590
 591     config = Malloc(MAXCONFIG);                             /* get space for the config data */
 592     CHECKALLOC(config, "Can't allocate config data");
 593
 594     format_config(config, MAXCONFIG);
 595     error = 0;                                              /* no errors yet */
 596     for (driveno = 0; driveno < vinum_conf.drives_allocated; driveno++) {
 597         drive = &vinum_conf.drive[driveno];                 /* point to drive */
 598         if (drive->state > drive_referenced) {
 599             LOCKDRIVE(drive);                               /* don't let it change */
 600
 601             /*
 602              * First, do some drive consistency checks.  Some
 603              * of these are kludges, others require a process
 604              * context and couldn't be done before
 605              */
 606             if ((drive->devicename[0] == '\0')
 607                 || (drive->label.name[0] == '\0')) {
 608                 unlockdrive(drive);
 609                 free_drive(drive);                          /* get rid of it */
 610                 break;
 611             }
 612             if (((drive->flags & VF_OPEN) == 0)             /* drive not open */
 613             &&(drive->state > drive_down)) {                /* and it thinks it's not down */
 614                 unlockdrive(drive);
 615                 set_drive_state(driveno, drive_down, setstate_force); /* tell it what's what */
 616                 continue;
 617             }
 618             if ((drive->state == drive_down)                /* it's down */
 619             &&(drive->flags & VF_OPEN)) {                   /* but open, */
 620                 unlockdrive(drive);
 621                 close_drive(drive);                         /* close it */
 622             } else if (drive->state > drive_down) {
 623                 getmicrotime(&drive->label.last_update);    /* time of last update is now */
 624                 bcopy((char *) &drive->label,               /* and the label info from the drive structure */
 625                     (char *) &vhdr->label,
 626                     sizeof(vhdr->label));
 627                 if ((drive->state != drive_unallocated)
 628                     && (drive->state != drive_referenced)) { /* and it's a real drive */
 629                     wlabel_on = 1;                          /* enable writing the label */
 630                     error = 0;
 631 #if 1
 632                     error = VOP_IOCTL(drive->vp, DIOCWLABEL,
 633                                       (caddr_t)&wlabel_on,
 634                                       FREAD|FWRITE, proc0.p_ucred);
 635 #endif
 636                     if (error == 0)
 637                         error = write_drive(drive, (char *) vhdr, VINUMHEADERLEN, VINUM_LABEL_OFFSET);
 638                     if (error == 0)
 639                         error = write_drive(drive, config, MAXCONFIG, VINUM_CONFIG_OFFSET); /* first config copy */
 640                     if (error == 0)
 641                         error = write_drive(drive, config, MAXCONFIG, VINUM_CONFIG_OFFSET + MAXCONFIG); /* second copy */
 642                     wlabel_on = 0;                          /* enable writing the label */
 643 #if 1
 644                     if (error == 0) {
 645                         error = VOP_IOCTL(drive->vp, DIOCWLABEL,
 646                                           (caddr_t)&wlabel_on,
 647                                           FREAD|FWRITE, proc0.p_ucred);
 648                     }
 649 #endif
 650                     unlockdrive(drive);
 651                     if (error) {
 652                         log(LOG_ERR,
 653                             "vinum: Can't write config to %s, error %d\n",
 654                             drive->devicename,
 655                             error);
 656                         set_drive_state(drive->driveno, drive_down, setstate_force);
 657                     } else
 658                         written_config = 1;                 /* we've written it on at least one drive */
 659                 }
 660             } else                                          /* not worth looking at, */
 661                 unlockdrive(drive);                         /* just unlock it again */
 662         }
 663     }
 664     Free(vhdr);
 665     Free(config);
 666 }
 667
 668 /* Look at all disks on the system for vinum slices */
 669 int
 670 vinum_scandisk(char *devicename[], int drives)
 671 {
 672     struct drive *volatile drive;
 673     volatile int driveno;
 674     int firstdrive;                                         /* first drive in this list */
 675     volatile int gooddrives;                                /* number of usable drives found */
 676     int firsttime;                                          /* set if we have never configured before */
 677     int error;
 678     char *config_text;                                      /* read the config info from disk into here */
 679     char *volatile cptr;                                    /* pointer into config information */
 680     char *eptr;                                             /* end pointer into config information */
 681     char *config_line;                                      /* copy the config line to */
 682     volatile int status;
 683     int *volatile drivelist;                                /* list of drive indices */
 684 #define DRIVENAMELEN 64
 685 #define DRIVEPARTS   35                                     /* max partitions per drive, excluding c */
 686     char partname[DRIVENAMELEN];                            /* for creating partition names */
 687
 688     status = 0;                                             /* success indication */
 689     vinum_conf.flags |= VF_READING_CONFIG;                  /* reading config from disk */
 690
 691     gooddrives = 0;                                         /* number of usable drives found */
 692     firstdrive = vinum_conf.drives_used;                    /* the first drive */
 693     firsttime = vinum_conf.drives_used == 0;                /* are we a virgin? */
 694
 695     /* allocate a drive pointer list */
 696     drivelist = (int *) Malloc(drives * DRIVEPARTS * sizeof(int));
 697     CHECKALLOC(drivelist, "Can't allocate memory");
 698     error = lock_config();                                  /* make sure we're alone here */
 699     if (error)
 700         return error;
 701     error = setjmp(command_fail);                           /* come back here on error */
 702     if (error) {                                            /* longjmped out */
 703         unlock_config();
 704         return error;
 705     }
 706
 707     /* Open all drives and find which was modified most recently */
 708     for (driveno = 0; driveno < drives; driveno++) {
 709         char part;                                          /* UNIX partition */
 710         int slice;
 711         int founddrive;                                     /* flag when we find a vinum drive */
 712         int has_slice = 0;
 713         int has_part = 0;
 714         char *tmp;
 715
 716         founddrive = 0;                                     /* no vinum drive found yet on this spindle */
 717
 718         /*
 719          * If the device path contains a slice we do not try to tack on
 720          * another slice.  If the device path has a partition we only check
 721          * that partition.
 722          */
 723         if ((tmp = rindex(devicename[driveno], '/')) == NULL)
 724             tmp = devicename[driveno];
 725         while (*tmp && (*tmp < '0' || *tmp > '9'))
 726             ++tmp;
 727         while (*tmp && *tmp >= '0' && *tmp <= '9')
 728             ++tmp;
 729         if (*tmp == 's')
 730             has_slice = strtol(tmp + 1, &tmp, 0);
 731         if (*tmp >= 'a' && *tmp <= 'p')
 732             has_part = *tmp;
 733
 734         /*
 735          * Scan slices if no slice was specified, only if no partition was
 736          * specified.
 737          */
 738         if (has_slice == 0 && has_part == 0)
 739         for (slice = 0; slice < MAX_SLICES; slice++) {
 740             if (has_slice && slice != has_slice)
 741                 continue;
 742
 743             for (part = 'a'; part < 'a' + MAXPARTITIONS; part++) {
 744                 if (has_part && part != has_part)
 745                     continue;
 746                 if (part == 'c')
 747                     continue;
 748                 ksnprintf(partname, DRIVENAMELEN,
 749                         "%ss%d%c", devicename[driveno], slice, part);
 750                 drive = check_drive(partname);      /* try to open it */
 751                 if ((drive->lasterror != 0)                 /* didn't work, */
 752                     ||(drive->state != drive_up))
 753                     free_drive(drive);              /* get rid of it */
 754                 else if (drive->flags & VF_CONFIGURED)  /* already read this config, */
 755                     log(LOG_WARNING,
 756                         "vinum: already read config from %s\n", /* say so */
 757                         drive->label.name);
 758                 else {
 759                     drivelist[gooddrives] = drive->driveno;     /* keep the drive index */
 760                     drive->flags &= ~VF_NEWBORN;            /* which is no longer newly born */
 761                     gooddrives++;
 762                     founddrive++;
 763                 }
 764             }
 765         }
 766         if (founddrive == 0 && has_slice == 0) {            /* didn't find anything, */
 767             for (part = 'a'; part < 'a' + MAXPARTITIONS; part++) {          /* try the compatibility partition */
 768                 if (has_part && has_part != part)
 769                     continue;
 770                 if (part == 'c')
 771                     continue;
 772                 if (has_part) {
 773                     ksnprintf(partname, DRIVENAMELEN,
 774                             "%s", devicename[driveno]);
 775                 } else {
 776                     ksnprintf(partname, DRIVENAMELEN,
 777                             "%s%c", devicename[driveno], part);
 778                 }
 779                 drive = check_drive(partname);      /* try to open it */
 780                 if ((drive->lasterror != 0)                 /* didn't work, */
 781                 ||(drive->state != drive_up))
 782                     free_drive(drive);              /* get rid of it */
 783                 else if (drive->flags & VF_CONFIGURED)  /* already read this config, */
 784                     log(LOG_WARNING,
 785                         "vinum: already read config from %s\n", /* say so */
 786                         drive->label.name);
 787                 else {
 788                     drivelist[gooddrives] = drive->driveno;     /* keep the drive index */
 789                     drive->flags &= ~VF_NEWBORN;            /* which is no longer newly born */
 790                     gooddrives++;
 791                 }
 792             }
 793         }
 794     }
 795
 796     if (gooddrives == 0) {
 797         if (firsttime)
 798             log(LOG_WARNING, "vinum: no drives found\n");
 799         else
 800             log(LOG_INFO, "vinum: no additional drives found\n");
 801         unlock_config();
 802         return ENOENT;
 803     }
 804     /*
 805      * We now have at least one drive
 806      * open.  Sort them in order of config time
 807      * and merge the config info with what we
 808      * have already.
 809      */
 810     kqsort(drivelist, gooddrives, sizeof(int), drivecmp);
 811     config_text = (char *) Malloc(MAXCONFIG * 2);           /* allocate buffers */
 812     CHECKALLOC(config_text, "Can't allocate memory");
 813     config_line = (char *) Malloc(MAXCONFIGLINE * 2);       /* allocate buffers */
 814     CHECKALLOC(config_line, "Can't allocate memory");
 815     for (driveno = 0; driveno < gooddrives; driveno++) {    /* now include the config */
 816         drive = &DRIVE[drivelist[driveno]];                 /* point to the drive */
 817
 818         if (firsttime && (driveno == 0))                    /* we've never configured before, */
 819             log(LOG_INFO, "vinum: reading configuration from %s\n", drive->devicename);
 820         else
 821             log(LOG_INFO, "vinum: updating configuration from %s\n", drive->devicename);
 822
 823         if (drive->state == drive_up)
 824             /* Read in both copies of the configuration information */
 825             error = read_drive(drive, config_text, MAXCONFIG * 2, VINUM_CONFIG_OFFSET);
 826         else {
 827             error = EIO;
 828             kprintf("vinum_scandisk: %s is %s\n", drive->devicename, drive_state(drive->state));
 829         }
 830
 831         if (error != 0) {
 832             log(LOG_ERR, "vinum: Can't read device %s, error %d\n", drive->devicename, error);
 833             free_drive(drive);                              /* give it back */
 834             status = error;
 835         }
 836         /*
 837          * At this point, check that the two copies
 838          * are the same, and do something useful if
 839          * not.  In particular, consider which is
 840          * newer, and what this means for the
 841          * integrity of the data on the drive.
 842          */
 843         else {
 844             vinum_conf.drives_used++;                       /* another drive in use */
 845             /* Parse the configuration, and add it to the global configuration */
 846             for (cptr = config_text; *cptr != '\0';) {      /* love this style(9) */
 847                 volatile int parse_status;                  /* return value from parse_config */
 848
 849                 for (eptr = config_line; (*cptr != '\n') && (*cptr != '\0');) /* until the end of the line */
 850                     *eptr++ = *cptr++;
 851                 *eptr = '\0';                               /* and delimit */
 852                 if (setjmp(command_fail) == 0) {            /* come back here on error and continue */
 853                     parse_status = parse_config(config_line, &keyword_set, 1); /* parse the config line */
 854                     if (parse_status < 0) {                 /* error in config */
 855                         /*
 856                            * This config should have been parsed in user
 857                            * space.  If we run into problems here, something
 858                            * serious is afoot.  Complain and let the user
 859                            * snarf the config to see what's wrong.
 860                          */
 861                         log(LOG_ERR,
 862                             "vinum: Config error on %s, aborting integration\n",
 863                             drive->devicename);
 864                         free_drive(drive);                  /* give it back */
 865                         status = EINVAL;
 866                     }
 867                 }
 868                 while (*cptr == '\n')
 869                     cptr++;                                 /* skip to next line */
 870             }
 871         }
 872         drive->flags |= VF_CONFIGURED;                      /* read this drive's configuration */
 873     }
 874
 875     Free(config_line);
 876     Free(config_text);
 877     Free(drivelist);
 878     vinum_conf.flags &= ~VF_READING_CONFIG;                 /* no longer reading from disk */
 879     if (status != 0)
 880         kprintf("vinum: couldn't read configuration");
 881     else
 882         updateconfig(VF_READING_CONFIG);                    /* update from disk config */
 883     unlock_config();
 884     return status;
 885 }
 886
 887 /*
 888  * Compare the modification dates of the drives, for qsort.
 889  * Return 1 if a < b, 0 if a == b, 01 if a > b: in other
 890  * words, sort backwards.
 891  */
 892 int
 893 drivecmp(const void *va, const void *vb)
 894 {
 895     const struct drive *a = &DRIVE[*(const int *) va];
 896     const struct drive *b = &DRIVE[*(const int *) vb];
 897
 898     if ((a->label.last_update.tv_sec == b->label.last_update.tv_sec)
 899         && (a->label.last_update.tv_usec == b->label.last_update.tv_usec))
 900         return 0;
 901     else if ((a->label.last_update.tv_sec > b->label.last_update.tv_sec)
 902             || ((a->label.last_update.tv_sec == b->label.last_update.tv_sec)
 903             && (a->label.last_update.tv_usec > b->label.last_update.tv_usec)))
 904         return -1;
 905     else
 906         return 1;
 907 }
 908 /* Local Variables: */
 909 /* fill-column: 50 */
 910 /* End: */