sys/kern/subr_disklabel32.c

   1 /*
   2  * Copyright (c) 2003-2007 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@backplane.com>
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  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
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  * ----------------------------------------------------------------------------
  35  * "THE BEER-WARE LICENSE" (Revision 42):
  36  * <phk@FreeBSD.ORG> wrote this file.  As long as you retain this notice you
  37  * can do whatever you want with this stuff. If we meet some day, and you think
  38  * this stuff is worth it, you can buy me a beer in return.   Poul-Henning Kamp
  39  * ----------------------------------------------------------------------------
  40  *
  41  * Copyright (c) 1982, 1986, 1988, 1993
  42  *      The Regents of the University of California.  All rights reserved.
  43  * (c) UNIX System Laboratories, Inc.
  44  * All or some portions of this file are derived from material licensed
  45  * to the University of California by American Telephone and Telegraph
  46  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
  47  * the permission of UNIX System Laboratories, Inc.
  48  *
  49  * Copyright (c) 1994 Bruce D. Evans.
  50  * All rights reserved.
  51  *
  52  * Copyright (c) 1990 The Regents of the University of California.
  53  * All rights reserved.
  54  *
  55  * This code is derived from software contributed to Berkeley by
  56  * William Jolitz.
  57  *
  58  * Copyright (c) 1982, 1986, 1988 Regents of the University of California.
  59  * All rights reserved.
  60  *
  61  * Redistribution and use in source and binary forms, with or without
  62  * modification, are permitted provided that the following conditions
  63  * are met:
  64  * 1. Redistributions of source code must retain the above copyright
  65  *    notice, this list of conditions and the following disclaimer.
  66  * 2. Redistributions in binary form must reproduce the above copyright
  67  *    notice, this list of conditions and the following disclaimer in the
  68  *    documentation and/or other materials provided with the distribution.
  69  * 3. Neither the name of the University nor the names of its contributors
  70  *    may be used to endorse or promote products derived from this software
  71  *    without specific prior written permission.
  72  *
  73  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  74  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  75  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  76  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  77  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  78  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  79  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  80  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  81  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  82  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  83  * SUCH DAMAGE.
  84  *
  85  *      @(#)ufs_disksubr.c      8.5 (Berkeley) 1/21/94
  86  * $FreeBSD: src/sys/kern/subr_disk.c,v 1.20.2.6 2001/10/05 07:14:57 peter Exp $
  87  * $FreeBSD: src/sys/ufs/ufs/ufs_disksubr.c,v 1.44.2.3 2001/03/05 05:42:19 obrien Exp $
  88  */
  89
  90 #include <sys/param.h>
  91 #include <sys/systm.h>
  92 #include <sys/kernel.h>
  93 #include <sys/malloc.h>
  94 #include <sys/proc.h>
  95 #include <sys/sysctl.h>
  96 #include <sys/buf.h>
  97 #include <sys/conf.h>
  98 #include <sys/disklabel.h>
  99 #include <sys/disklabel32.h>
 100 #include <sys/diskslice.h>
 101 #include <sys/disk.h>
 102 #include <sys/dtype.h>          /* DTYPE_* constants */
 103 #include <machine/md_var.h>
 104 #include <sys/ctype.h>
 105 #include <sys/syslog.h>
 106 #include <sys/device.h>
 107 #include <sys/msgport.h>
 108 #include <sys/msgport2.h>
 109 #include <sys/buf2.h>
 110
 111 #include <vfs/ufs/dinode.h>     /* XXX used only for fs.h */
 112 #include <vfs/ufs/fs.h>         /* XXX used only to get BBSIZE/SBSIZE */
 113
 114 static void partition_info(const char *sname, int part, struct partition32 *pp);
 115 static void slice_info(const char *sname, struct diskslice *sp);
 116 static const char *l32_fixlabel(const char *sname, struct diskslice *sp,
 117                                 disklabel_t lpx, int writeflag);
 118
 119 /*
 120  * Retrieve the partition start and extent, in blocks.  Return 0 on success,
 121  * EINVAL on error.
 122  */
 123 static int
 124 l32_getpartbounds(struct diskslices *ssp, disklabel_t lp, u_int32_t part,
 125                   u_int64_t *start, u_int64_t *blocks)
 126 {
 127         struct partition32 *pp;
 128
 129         if (part >= lp.lab32->d_npartitions)
 130                 return (EINVAL);
 131         pp = &lp.lab32->d_partitions[part];
 132         *start = pp->p_offset;
 133         *blocks = pp->p_size;
 134         return(0);
 135 }
 136
 137 static void
 138 l32_loadpartinfo(disklabel_t lp, u_int32_t part, struct partinfo *dpart)
 139 {
 140         struct partition32 *pp;
 141         const size_t uuid_size = sizeof(struct uuid);
 142
 143         bzero(&dpart->fstype_uuid, uuid_size);
 144         bzero(&dpart->storage_uuid, uuid_size);
 145         if (part < lp.lab32->d_npartitions) {
 146                 pp = &lp.lab32->d_partitions[part];
 147                 dpart->fstype = pp->p_fstype;
 148         } else {
 149                 dpart->fstype = 0;
 150         }
 151 }
 152
 153 static u_int32_t
 154 l32_getnumparts(disklabel_t lp)
 155 {
 156         return(lp.lab32->d_npartitions);
 157 }
 158
 159 static int
 160 l32_getpackname(disklabel_t lp, char *buf, size_t bytes)
 161 {
 162         size_t slen;
 163
 164         if (lp.lab32->d_packname[0] == 0) {
 165                 buf[0] = 0;
 166                 return -1;
 167         }
 168         slen = strnlen(lp.lab32->d_packname, sizeof(lp.lab32->d_packname));
 169         if (slen >= bytes)
 170                 slen = bytes - 1;
 171         bcopy(lp.lab32->d_packname, buf, slen);
 172         buf[slen] = 0;
 173
 174         return 0;
 175 }
 176
 177 static void
 178 l32_freedisklabel(disklabel_t *lpp)
 179 {
 180         kfree((*lpp).lab32, M_DEVBUF);
 181         (*lpp).lab32 = NULL;
 182 }
 183
 184 /*
 185  * Attempt to read a disk label from a device.
 186  *
 187  * Returns NULL on sucess, and an error string on failure
 188  */
 189 static const char *
 190 l32_readdisklabel(cdev_t dev, struct diskslice *sp, disklabel_t *lpp,
 191                 struct disk_info *info)
 192 {
 193         disklabel_t lpx;
 194         struct buf *bp;
 195         struct disklabel32 *dlp;
 196         const char *msg = NULL;
 197         int secsize = info->d_media_blksize;
 198
 199         bp = getpbuf_mem(NULL);
 200         KKASSERT(secsize <= bp->b_bufsize);
 201         bp->b_bio1.bio_offset = (off_t)LABELSECTOR32 * secsize;
 202         bp->b_bio1.bio_done = biodone_sync;
 203         bp->b_bio1.bio_flags |= BIO_SYNC;
 204         bp->b_bcount = secsize;
 205         bp->b_flags &= ~B_INVAL;
 206         bp->b_cmd = BUF_CMD_READ;
 207         bp->b_flags |= B_FAILONDIS;
 208         dev_dstrategy(dev, &bp->b_bio1);
 209         if (biowait(&bp->b_bio1, "labrd"))
 210                 msg = "I/O error";
 211         else for (dlp = (struct disklabel32 *)bp->b_data;
 212             dlp <= (struct disklabel32 *)((char *)bp->b_data +
 213             secsize - sizeof(*dlp));
 214             dlp = (struct disklabel32 *)((char *)dlp + sizeof(long))) {
 215                 if (dlp->d_magic != DISKMAGIC32 ||
 216                     dlp->d_magic2 != DISKMAGIC32) {
 217                         /*
 218                          * NOTE! dsreadandsetlabel() does a strcmp() on
 219                          * this string.
 220                          */
 221                         if (msg == NULL)
 222                                 msg = "no disk label";
 223                 } else if (dlp->d_npartitions > MAXPARTITIONS32 ||
 224                            dkcksum32(dlp) != 0) {
 225                         msg = "disk label corrupted";
 226                 } else {
 227                         lpx.lab32 = dlp;
 228                         msg = l32_fixlabel(NULL, sp, lpx, FALSE);
 229                         if (msg == NULL) {
 230                                 (*lpp).lab32 = kmalloc(sizeof(*dlp),
 231                                                        M_DEVBUF, M_WAITOK|M_ZERO);
 232                                 *(*lpp).lab32 = *dlp;
 233                         }
 234                         break;
 235                 }
 236         }
 237         bp->b_flags |= B_INVAL | B_AGE;
 238         relpbuf(bp, NULL);
 239
 240         return (msg);
 241 }
 242
 243 /*
 244  * Check new disk label for sensibility before setting it.
 245  */
 246 static int
 247 l32_setdisklabel(disklabel_t olpx, disklabel_t nlpx, struct diskslices *ssp,
 248                  struct diskslice *sp, u_int32_t *openmask)
 249 {
 250         struct disklabel32 *olp, *nlp;
 251         struct partition32 *opp, *npp;
 252         int part;
 253         int i;
 254
 255         olp = olpx.lab32;
 256         nlp = nlpx.lab32;
 257
 258         /*
 259          * Check it is actually a disklabel we are looking at.
 260          */
 261         if (nlp->d_magic != DISKMAGIC32 || nlp->d_magic2 != DISKMAGIC32 ||
 262             dkcksum32(nlp) != 0)
 263                 return (EINVAL);
 264
 265         /*
 266          * For each partition that we think is open, check the new disklabel
 267          * for compatibility.  Ignore special partitions (>= 128).
 268          */
 269         i = 0;
 270         while (i < 128) {
 271                 if (openmask[i >> 5] == 0) {
 272                         i += 32;
 273                         continue;
 274                 }
 275                 if ((openmask[i >> 5] & (1 << (i & 31))) == 0) {
 276                         ++i;
 277                         continue;
 278                 }
 279                 if (nlp->d_npartitions <= i)
 280                         return (EBUSY);
 281                 opp = &olp->d_partitions[i];
 282                 npp = &nlp->d_partitions[i];
 283                 if (npp->p_offset != opp->p_offset || npp->p_size < opp->p_size)
 284                         return (EBUSY);
 285                 /*
 286                  * Copy internally-set partition information
 287                  * if new label doesn't include it.             XXX
 288                  * (If we are using it then we had better stay the same type)
 289                  * This is possibly dubious, as someone else noted (XXX)
 290                  */
 291                 if (npp->p_fstype == FS_UNUSED && opp->p_fstype != FS_UNUSED) {
 292                         npp->p_fstype = opp->p_fstype;
 293                         npp->p_fsize = opp->p_fsize;
 294                         npp->p_frag = opp->p_frag;
 295                         npp->p_cpg = opp->p_cpg;
 296                 }
 297                 ++i;
 298         }
 299         nlp->d_checksum = 0;
 300         nlp->d_checksum = dkcksum32(nlp);
 301         *olp = *nlp;
 302
 303         if (olp->d_partitions[RAW_PART].p_offset)
 304                 return (EXDEV);
 305         if (olp->d_secperunit > sp->ds_size)
 306                 return (ENOSPC);
 307         for (part = 0; part < olp->d_npartitions; ++part) {
 308                 if (olp->d_partitions[part].p_size > sp->ds_size)
 309                         return(ENOSPC);
 310         }
 311         return (0);
 312 }
 313
 314 /*
 315  * Write disk label back to device after modification.
 316  */
 317 static int
 318 l32_writedisklabel(cdev_t dev, struct diskslices *ssp, struct diskslice *sp,
 319                    disklabel_t lpx)
 320 {
 321         struct disklabel32 *lp;
 322         struct disklabel32 *dlp;
 323         struct buf *bp;
 324         const char *msg;
 325         int error = 0;
 326
 327         lp = lpx.lab32;
 328
 329         if (lp->d_partitions[RAW_PART].p_offset != 0)
 330                 return (EXDEV);                 /* not quite right */
 331
 332         bp = getpbuf_mem(NULL);
 333         KKASSERT((int)lp->d_secsize <= bp->b_bufsize);
 334         bp->b_bio1.bio_offset = (off_t)LABELSECTOR32 * lp->d_secsize;
 335         bp->b_bio1.bio_done = biodone_sync;
 336         bp->b_bio1.bio_flags |= BIO_SYNC;
 337         bp->b_bcount = lp->d_secsize;
 338         bp->b_flags |= B_FAILONDIS;
 339
 340 #if 1
 341         /*
 342          * We read the label first to see if it's there,
 343          * in which case we will put ours at the same offset into the block..
 344          * (I think this is stupid [Julian])
 345          * Note that you can't write a label out over a corrupted label!
 346          * (also stupid.. how do you write the first one? by raw writes?)
 347          */
 348         bp->b_flags &= ~B_INVAL;
 349         bp->b_cmd = BUF_CMD_READ;
 350         KKASSERT(dkpart(dev) == WHOLE_SLICE_PART);
 351         dev_dstrategy(dev, &bp->b_bio1);
 352         error = biowait(&bp->b_bio1, "labrd");
 353         if (error)
 354                 goto done;
 355         for (dlp = (struct disklabel32 *)bp->b_data;
 356             dlp <= (struct disklabel32 *)
 357               ((char *)bp->b_data + lp->d_secsize - sizeof(*dlp));
 358             dlp = (struct disklabel32 *)((char *)dlp + sizeof(long))) {
 359                 if (dlp->d_magic == DISKMAGIC32 &&
 360                     dlp->d_magic2 == DISKMAGIC32 && dkcksum32(dlp) == 0) {
 361                         *dlp = *lp;
 362                         lpx.lab32 = dlp;
 363                         msg = l32_fixlabel(NULL, sp, lpx, TRUE);
 364                         if (msg) {
 365                                 error = EINVAL;
 366                         } else {
 367                                 bp->b_cmd = BUF_CMD_WRITE;
 368                                 bp->b_bio1.bio_done = biodone_sync;
 369                                 bp->b_bio1.bio_flags |= BIO_SYNC;
 370                                 KKASSERT(dkpart(dev) == WHOLE_SLICE_PART);
 371                                 dev_dstrategy(dev, &bp->b_bio1);
 372                                 error = biowait(&bp->b_bio1, "labwr");
 373                         }
 374                         goto done;
 375                 }
 376         }
 377         error = ESRCH;
 378 done:
 379 #else
 380         bzero(bp->b_data, lp->d_secsize);
 381         dlp = (struct disklabel32 *)bp->b_data;
 382         *dlp = *lp;
 383         bp->b_flags &= ~B_INVAL;
 384         bp->b_cmd = BUF_CMD_WRITE;
 385         bp->b_bio1.bio_done = biodone_sync;
 386         bp->b_bio1.bio_flags |= BIO_SYNC;
 387         BUF_STRATEGY(bp, 1);
 388         error = biowait(&bp->b_bio1, "labwr");
 389 #endif
 390         bp->b_flags |= B_INVAL | B_AGE;
 391         relpbuf(bp, NULL);
 392
 393         return (error);
 394 }
 395
 396 /*
 397  * Create a disklabel based on a disk_info structure, initializing
 398  * the appropriate fields and creating a raw partition that covers the
 399  * whole disk.
 400  *
 401  * If a diskslice is passed, the label is truncated to the slice
 402  */
 403 static disklabel_t
 404 l32_clone_label(struct disk_info *info, struct diskslice *sp)
 405 {
 406         struct disklabel32 *lp;
 407         disklabel_t res;
 408
 409         lp = kmalloc(sizeof *lp, M_DEVBUF, M_WAITOK | M_ZERO);
 410         lp->d_nsectors = info->d_secpertrack;
 411         lp->d_ntracks = info->d_nheads;
 412         lp->d_secpercyl = info->d_secpercyl;
 413         lp->d_secsize = info->d_media_blksize;
 414
 415         if (sp)
 416                 lp->d_secperunit = (u_int)sp->ds_size;
 417         else
 418                 lp->d_secperunit = (u_int)info->d_media_blocks;
 419
 420         if (lp->d_typename[0] == '\0')
 421                 strncpy(lp->d_typename, "amnesiac", sizeof(lp->d_typename));
 422         if (lp->d_packname[0] == '\0')
 423                 strncpy(lp->d_packname, "fictitious", sizeof(lp->d_packname));
 424         if (lp->d_nsectors == 0)
 425                 lp->d_nsectors = 32;
 426         if (lp->d_ntracks == 0)
 427                 lp->d_ntracks = 64;
 428         lp->d_secpercyl = lp->d_nsectors * lp->d_ntracks;
 429         lp->d_ncylinders = lp->d_secperunit / lp->d_secpercyl;
 430         if (lp->d_rpm == 0)
 431                 lp->d_rpm = 3600;
 432         if (lp->d_interleave == 0)
 433                 lp->d_interleave = 1;
 434         if (lp->d_npartitions < RAW_PART + 1)
 435                 lp->d_npartitions = MAXPARTITIONS32;
 436         if (lp->d_bbsize == 0)
 437                 lp->d_bbsize = BBSIZE;
 438         if (lp->d_sbsize == 0)
 439                 lp->d_sbsize = SBSIZE;
 440
 441         /*
 442          * Used by various devices to create a compatibility slice which
 443          * allows us to mount root from devices which do not have a
 444          * disklabel.  Particularly: CDs.
 445          */
 446         lp->d_partitions[RAW_PART].p_size = lp->d_secperunit;
 447         if (info->d_dsflags & DSO_COMPATPARTA) {
 448                 lp->d_partitions[0].p_size = lp->d_secperunit;
 449                 lp->d_partitions[0].p_fstype = FS_OTHER;
 450         }
 451         lp->d_magic = DISKMAGIC32;
 452         lp->d_magic2 = DISKMAGIC32;
 453         lp->d_checksum = dkcksum32(lp);
 454         res.lab32 = lp;
 455         return (res);
 456 }
 457
 458 static void
 459 l32_makevirginlabel(disklabel_t lpx, struct diskslices *ssp,
 460                     struct diskslice *sp, struct disk_info *info)
 461 {
 462         struct disklabel32 *lp = lpx.lab32;
 463         struct partition32 *pp;
 464         disklabel_t template;
 465
 466         template = l32_clone_label(info, NULL);
 467         bcopy(template.opaque, lp, sizeof(struct disklabel32));
 468
 469         lp->d_magic = DISKMAGIC32;
 470         lp->d_magic2 = DISKMAGIC32;
 471
 472         lp->d_npartitions = MAXPARTITIONS32;
 473         if (lp->d_interleave == 0)
 474                 lp->d_interleave = 1;
 475         if (lp->d_rpm == 0)
 476                 lp->d_rpm = 3600;
 477         if (lp->d_nsectors == 0)        /* sectors per track */
 478                 lp->d_nsectors = 32;
 479         if (lp->d_ntracks == 0)         /* heads */
 480                 lp->d_ntracks = 64;
 481         lp->d_ncylinders = 0;
 482         lp->d_bbsize = BBSIZE;
 483         lp->d_sbsize = SBSIZE;
 484
 485         /*
 486          * If the slice or GPT partition is really small we could
 487          * wind up with an absurd calculation for ncylinders.
 488          */
 489         while (lp->d_ncylinders < 4) {
 490                 if (lp->d_ntracks > 1)
 491                         lp->d_ntracks >>= 1;
 492                 else if (lp->d_nsectors > 1)
 493                         lp->d_nsectors >>= 1;
 494                 else
 495                         break;
 496                 lp->d_secpercyl = lp->d_nsectors * lp->d_ntracks;
 497                 lp->d_ncylinders = sp->ds_size / lp->d_secpercyl;
 498         }
 499
 500         /*
 501          * Set or Modify the partition sizes to accomodate the slice,
 502          * since we started with a copy of the virgin label stored
 503          * in the whole-disk-slice and we are probably not a
 504          * whole-disk slice.
 505          */
 506         lp->d_secperunit = sp->ds_size;
 507         pp = &lp->d_partitions[RAW_PART];
 508         pp->p_offset = 0;
 509         pp->p_size = lp->d_secperunit;
 510         if (info->d_dsflags & DSO_COMPATPARTA) {
 511                 pp = &lp->d_partitions[0];
 512                 pp->p_offset = 0;
 513                 pp->p_size = lp->d_secperunit;
 514                 pp->p_fstype = FS_OTHER;
 515         }
 516         lp->d_checksum = 0;
 517         lp->d_checksum = dkcksum32(lp);
 518
 519         kfree(template.opaque, M_DEVBUF);
 520 }
 521
 522 static const char *
 523 l32_fixlabel(const char *sname, struct diskslice *sp,
 524              disklabel_t lpx, int writeflag)
 525 {
 526         struct disklabel32 *lp;
 527         struct partition32 *pp;
 528         u_int64_t start;
 529         u_int64_t end;
 530         u_int64_t offset;
 531         int part;
 532         int warned;
 533
 534         lp = lpx.lab32;
 535
 536         /* These errors "can't happen" so don't bother reporting details. */
 537         if (lp->d_magic != DISKMAGIC32 || lp->d_magic2 != DISKMAGIC32)
 538                 return ("fixlabel: invalid magic");
 539         if (dkcksum32(lp) != 0)
 540                 return ("fixlabel: invalid checksum");
 541
 542         pp = &lp->d_partitions[RAW_PART];
 543
 544         /*
 545          * What a mess.  For ages old backwards compatibility the disklabel
 546          * on-disk stores absolute offsets instead of slice-relative offsets.
 547          * So fix it up when reading, writing, or snooping.
 548          *
 549          * The in-core label is always slice-relative.
 550          */
 551         if (writeflag) {
 552                 start = 0;
 553                 offset = sp->ds_offset;
 554         } else {
 555                 start = sp->ds_offset;
 556                 offset = -sp->ds_offset;
 557         }
 558         if (pp->p_offset != start) {
 559                 if (sname != NULL) {
 560                         kprintf(
 561 "%s: rejecting BSD label: raw partition offset != slice offset\n",
 562                                sname);
 563                         slice_info(sname, sp);
 564                         partition_info(sname, RAW_PART, pp);
 565                 }
 566                 return ("fixlabel: raw partition offset != slice offset");
 567         }
 568         if (pp->p_size != sp->ds_size) {
 569                 if (sname != NULL) {
 570                         kprintf("%s: raw partition size != slice size\n", sname);
 571                         slice_info(sname, sp);
 572                         partition_info(sname, RAW_PART, pp);
 573                 }
 574                 if (pp->p_size > sp->ds_size) {
 575                         if (sname == NULL)
 576                                 return ("fixlabel: raw partition size > slice size");
 577                         kprintf("%s: truncating raw partition\n", sname);
 578                         pp->p_size = sp->ds_size;
 579                 }
 580         }
 581         end = start + sp->ds_size;
 582         if (start > end)
 583                 return ("fixlabel: slice wraps");
 584         if (lp->d_secpercyl <= 0)
 585                 return ("fixlabel: d_secpercyl <= 0");
 586         pp -= RAW_PART;
 587         warned = FALSE;
 588         for (part = 0; part < lp->d_npartitions; part++, pp++) {
 589                 if (pp->p_offset != 0 || pp->p_size != 0) {
 590                         if (pp->p_offset < start
 591                             || pp->p_offset + pp->p_size > end
 592                             || pp->p_offset + pp->p_size < pp->p_offset) {
 593                                 if (sname != NULL) {
 594                                         kprintf(
 595 "%s: rejecting partition in BSD label: it isn't entirely within the slice\n",
 596                                                sname);
 597                                         if (!warned) {
 598                                                 slice_info(sname, sp);
 599                                                 warned = TRUE;
 600                                         }
 601                                         partition_info(sname, part, pp);
 602                                 }
 603                                 /* XXX else silently discard junk. */
 604                                 bzero(pp, sizeof *pp);
 605                         } else {
 606                                 pp->p_offset += offset;
 607                         }
 608                 }
 609         }
 610         lp->d_ncylinders = sp->ds_size / lp->d_secpercyl;
 611         lp->d_secperunit = sp->ds_size;
 612         lp->d_checksum = 0;
 613         lp->d_checksum = dkcksum32(lp);
 614         return (NULL);
 615 }
 616
 617 /*
 618  * Set the number of blocks at the beginning of the slice which have
 619  * been reserved for label operations.  This area will be write-protected
 620  * when accessed via the slice.
 621  */
 622 static void
 623 l32_adjust_label_reserved(struct diskslices *ssp, int slice,
 624                           struct diskslice *sp)
 625 {
 626         /*struct disklabel32 *lp = sp->ds_label.lab32;*/
 627         sp->ds_reserved = SBSIZE / ssp->dss_secsize;
 628 }
 629
 630 static void
 631 partition_info(const char *sname, int part, struct partition32 *pp)
 632 {
 633         kprintf("%s%c: start %lu, end %lu, size %lu\n", sname, 'a' + part,
 634                 (u_long)pp->p_offset, (u_long)(pp->p_offset + pp->p_size - 1),
 635                 (u_long)pp->p_size);
 636 }
 637
 638 static void
 639 slice_info(const char *sname, struct diskslice *sp)
 640 {
 641         kprintf("%s: start %llu, end %llu, size %llu\n", sname,
 642                (long long)sp->ds_offset,
 643                (long long)sp->ds_offset + sp->ds_size - 1,
 644                (long long)sp->ds_size);
 645 }
 646
 647 struct disklabel_ops disklabel32_ops = {
 648         .labelsize = sizeof(struct disklabel32),
 649         .op_readdisklabel = l32_readdisklabel,
 650         .op_setdisklabel = l32_setdisklabel,
 651         .op_writedisklabel = l32_writedisklabel,
 652         .op_clone_label = l32_clone_label,
 653         .op_adjust_label_reserved = l32_adjust_label_reserved,
 654         .op_getpartbounds = l32_getpartbounds,
 655         .op_loadpartinfo = l32_loadpartinfo,
 656         .op_getnumparts = l32_getnumparts,
 657         .op_makevirginlabel = l32_makevirginlabel,
 658         .op_getpackname = l32_getpackname,
 659         .op_freedisklabel = l32_freedisklabel
 660 };
 661