sys/geom/part/g_part_pc98.c

   1 /*-
   2  * Copyright (c) 2008 Marcel Moolenaar
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  */
  26
  27 #include <sys/cdefs.h>
  28 __FBSDID("$FreeBSD$");
  29
  30 #include <sys/param.h>
  31 #include <sys/bio.h>
  32 #include <sys/diskpc98.h>
  33 #include <sys/endian.h>
  34 #include <sys/kernel.h>
  35 #include <sys/kobj.h>
  36 #include <sys/limits.h>
  37 #include <sys/lock.h>
  38 #include <sys/malloc.h>
  39 #include <sys/mutex.h>
  40 #include <sys/queue.h>
  41 #include <sys/sbuf.h>
  42 #include <sys/systm.h>
  43 #include <geom/geom.h>
  44 #include <geom/part/g_part.h>
  45
  46 #include "g_part_if.h"
  47
  48 #define SECSIZE         512
  49
  50 struct g_part_pc98_table {
  51         struct g_part_table     base;
  52         u_char          boot[SECSIZE];
  53         u_char          table[SECSIZE];
  54 };
  55
  56 struct g_part_pc98_entry {
  57         struct g_part_entry     base;
  58         struct pc98_partition ent;
  59 };
  60
  61 static int g_part_pc98_add(struct g_part_table *, struct g_part_entry *,
  62     struct g_part_parms *);
  63 static int g_part_pc98_bootcode(struct g_part_table *, struct g_part_parms *);
  64 static int g_part_pc98_create(struct g_part_table *, struct g_part_parms *);
  65 static int g_part_pc98_destroy(struct g_part_table *, struct g_part_parms *);
  66 static void g_part_pc98_dumpconf(struct g_part_table *, struct g_part_entry *,
  67     struct sbuf *, const char *);
  68 static int g_part_pc98_dumpto(struct g_part_table *, struct g_part_entry *);
  69 static int g_part_pc98_modify(struct g_part_table *, struct g_part_entry *,
  70     struct g_part_parms *);
  71 static const char *g_part_pc98_name(struct g_part_table *, struct g_part_entry *,
  72     char *, size_t);
  73 static int g_part_pc98_probe(struct g_part_table *, struct g_consumer *);
  74 static int g_part_pc98_read(struct g_part_table *, struct g_consumer *);
  75 static int g_part_pc98_setunset(struct g_part_table *, struct g_part_entry *,
  76     const char *, unsigned int);
  77 static const char *g_part_pc98_type(struct g_part_table *,
  78     struct g_part_entry *, char *, size_t);
  79 static int g_part_pc98_write(struct g_part_table *, struct g_consumer *);
  80 static int g_part_pc98_resize(struct g_part_table *, struct g_part_entry *,
  81     struct g_part_parms *);
  82
  83 static kobj_method_t g_part_pc98_methods[] = {
  84         KOBJMETHOD(g_part_add,          g_part_pc98_add),
  85         KOBJMETHOD(g_part_bootcode,     g_part_pc98_bootcode),
  86         KOBJMETHOD(g_part_create,       g_part_pc98_create),
  87         KOBJMETHOD(g_part_destroy,      g_part_pc98_destroy),
  88         KOBJMETHOD(g_part_dumpconf,     g_part_pc98_dumpconf),
  89         KOBJMETHOD(g_part_dumpto,       g_part_pc98_dumpto),
  90         KOBJMETHOD(g_part_modify,       g_part_pc98_modify),
  91         KOBJMETHOD(g_part_resize,       g_part_pc98_resize),
  92         KOBJMETHOD(g_part_name,         g_part_pc98_name),
  93         KOBJMETHOD(g_part_probe,        g_part_pc98_probe),
  94         KOBJMETHOD(g_part_read,         g_part_pc98_read),
  95         KOBJMETHOD(g_part_setunset,     g_part_pc98_setunset),
  96         KOBJMETHOD(g_part_type,         g_part_pc98_type),
  97         KOBJMETHOD(g_part_write,        g_part_pc98_write),
  98         { 0, 0 }
  99 };
 100
 101 static struct g_part_scheme g_part_pc98_scheme = {
 102         "PC98",
 103         g_part_pc98_methods,
 104         sizeof(struct g_part_pc98_table),
 105         .gps_entrysz = sizeof(struct g_part_pc98_entry),
 106         .gps_minent = NDOSPART,
 107         .gps_maxent = NDOSPART,
 108         .gps_bootcodesz = SECSIZE,
 109 };
 110 G_PART_SCHEME_DECLARE(g_part_pc98);
 111
 112 static int
 113 pc98_parse_type(const char *type, u_char *dp_mid, u_char *dp_sid)
 114 {
 115         const char *alias;
 116         char *endp;
 117         long lt;
 118
 119         if (type[0] == '!') {
 120                 lt = strtol(type + 1, &endp, 0);
 121                 if (type[1] == '\0' || *endp != '\0' || lt <= 0 ||
 122                     lt >= 65536)
 123                         return (EINVAL);
 124                 /* Make sure the active and bootable flags aren't set. */
 125                 if (lt & ((PC98_SID_ACTIVE << 8) | PC98_MID_BOOTABLE))
 126                         return (ENOATTR);
 127                 *dp_mid = (*dp_mid & PC98_MID_BOOTABLE) | (u_char)lt;
 128                 *dp_sid = (*dp_sid & PC98_SID_ACTIVE) | (u_char)(lt >> 8);
 129                 return (0);
 130         }
 131         alias = g_part_alias_name(G_PART_ALIAS_FREEBSD);
 132         if (!strcasecmp(type, alias)) {
 133                 *dp_mid = (*dp_mid & PC98_MID_BOOTABLE) | PC98_MID_386BSD;
 134                 *dp_sid = (*dp_sid & PC98_SID_ACTIVE) | PC98_SID_386BSD;
 135                 return (0);
 136         }
 137         return (EINVAL);
 138 }
 139
 140 static void
 141 pc98_set_chs(struct g_part_table *table, uint32_t lba, u_short *cylp,
 142     u_char *hdp, u_char *secp)
 143 {
 144         uint32_t cyl, hd, sec;
 145
 146         sec = lba % table->gpt_sectors + 1;
 147         lba /= table->gpt_sectors;
 148         hd = lba % table->gpt_heads;
 149         lba /= table->gpt_heads;
 150         cyl = lba;
 151
 152         *cylp = htole16(cyl);
 153         *hdp = hd;
 154         *secp = sec;
 155 }
 156
 157 static int
 158 g_part_pc98_add(struct g_part_table *basetable, struct g_part_entry *baseentry,
 159     struct g_part_parms *gpp)
 160 {
 161         struct g_part_pc98_entry *entry;
 162         struct g_part_pc98_table *table;
 163         uint32_t cyl, start, size;
 164
 165         if (gpp->gpp_parms & G_PART_PARM_LABEL)
 166                 return (EINVAL);
 167
 168         cyl = basetable->gpt_heads * basetable->gpt_sectors;
 169
 170         entry = (struct g_part_pc98_entry *)baseentry;
 171         table = (struct g_part_pc98_table *)basetable;
 172
 173         start = gpp->gpp_start;
 174         size = gpp->gpp_size;
 175         if (size < cyl)
 176                 return (EINVAL);
 177         if (start % cyl) {
 178                 size = size - cyl + (start % cyl);
 179                 start = start - (start % cyl) + cyl;
 180         }
 181         if (size % cyl)
 182                 size = size - (size % cyl);
 183         if (size < cyl)
 184                 return (EINVAL);
 185
 186         if (baseentry->gpe_deleted)
 187                 bzero(&entry->ent, sizeof(entry->ent));
 188         else
 189                 entry->ent.dp_mid = entry->ent.dp_sid = 0;
 190
 191         KASSERT(baseentry->gpe_start <= start, (__func__));
 192         KASSERT(baseentry->gpe_end >= start + size - 1, (__func__));
 193         baseentry->gpe_start = start;
 194         baseentry->gpe_end = start + size - 1;
 195         pc98_set_chs(basetable, baseentry->gpe_start, &entry->ent.dp_scyl,
 196             &entry->ent.dp_shd, &entry->ent.dp_ssect);
 197         pc98_set_chs(basetable, baseentry->gpe_end, &entry->ent.dp_ecyl,
 198             &entry->ent.dp_ehd, &entry->ent.dp_esect);
 199         return (pc98_parse_type(gpp->gpp_type, &entry->ent.dp_mid,
 200             &entry->ent.dp_sid));
 201 }
 202
 203 static int
 204 g_part_pc98_bootcode(struct g_part_table *basetable, struct g_part_parms *gpp)
 205 {
 206         struct g_part_pc98_table *table;
 207         size_t codesz;
 208
 209         codesz = DOSMAGICOFFSET;
 210         table = (struct g_part_pc98_table *)basetable;
 211         bzero(table->boot, codesz);
 212         codesz = MIN(codesz, gpp->gpp_codesize);
 213         if (codesz > 0)
 214                 bcopy(gpp->gpp_codeptr, table->boot, codesz);
 215         return (0);
 216 }
 217
 218 static int
 219 g_part_pc98_create(struct g_part_table *basetable, struct g_part_parms *gpp)
 220 {
 221         struct g_consumer *cp;
 222         struct g_provider *pp;
 223         struct g_part_pc98_table *table;
 224         uint32_t cyl, msize;
 225
 226         pp = gpp->gpp_provider;
 227         cp = LIST_FIRST(&pp->consumers);
 228
 229         if (pp->sectorsize < SECSIZE || pp->mediasize < 2 * SECSIZE)
 230                 return (ENOSPC);
 231         if (pp->sectorsize > SECSIZE)
 232                 return (ENXIO);
 233
 234         cyl = basetable->gpt_heads * basetable->gpt_sectors;
 235
 236         msize = MIN(pp->mediasize / SECSIZE, 0xffffffff);
 237         basetable->gpt_first = cyl;
 238         basetable->gpt_last = msize - (msize % cyl) - 1;
 239
 240         table = (struct g_part_pc98_table *)basetable;
 241         le16enc(table->boot + DOSMAGICOFFSET, DOSMAGIC);
 242         return (0);
 243 }
 244
 245 static int
 246 g_part_pc98_destroy(struct g_part_table *basetable, struct g_part_parms *gpp)
 247 {
 248
 249         /* Wipe the first two sectors to clear the partitioning. */
 250         basetable->gpt_smhead |= 3;
 251         return (0);
 252 }
 253
 254 static void
 255 g_part_pc98_dumpconf(struct g_part_table *table,
 256     struct g_part_entry *baseentry, struct sbuf *sb, const char *indent)
 257 {
 258         struct g_part_pc98_entry *entry;
 259         char name[sizeof(entry->ent.dp_name) + 1];
 260         u_int type;
 261
 262         entry = (struct g_part_pc98_entry *)baseentry;
 263         if (entry == NULL) {
 264                 /* confxml: scheme information */
 265                 return;
 266         }
 267
 268         type = entry->ent.dp_mid + (entry->ent.dp_sid << 8);
 269         strncpy(name, entry->ent.dp_name, sizeof(name) - 1);
 270         name[sizeof(name) - 1] = '\0';
 271         if (indent == NULL) {
 272                 /* conftxt: libdisk compatibility */
 273                 sbuf_printf(sb, " xs PC98 xt %u sn %s", type, name);
 274         } else {
 275                 /* confxml: partition entry information */
 276                 sbuf_printf(sb, "%s<label>%s</label>\n", indent, name);
 277                 if (entry->ent.dp_mid & PC98_MID_BOOTABLE)
 278                         sbuf_printf(sb, "%s<attrib>bootable</attrib>\n",
 279                             indent);
 280                 if (entry->ent.dp_sid & PC98_SID_ACTIVE)
 281                         sbuf_printf(sb, "%s<attrib>active</attrib>\n", indent);
 282                 sbuf_printf(sb, "%s<rawtype>%u</rawtype>\n", indent,
 283                     type & 0x7f7f);
 284         }
 285 }
 286
 287 static int
 288 g_part_pc98_dumpto(struct g_part_table *table, struct g_part_entry *baseentry)
 289 {
 290         struct g_part_pc98_entry *entry;
 291
 292         /* Allow dumping to a FreeBSD partition only. */
 293         entry = (struct g_part_pc98_entry *)baseentry;
 294         return (((entry->ent.dp_mid & PC98_MID_MASK) == PC98_MID_386BSD &&
 295             (entry->ent.dp_sid & PC98_SID_MASK) == PC98_SID_386BSD) ? 1 : 0);
 296 }
 297
 298 static int
 299 g_part_pc98_modify(struct g_part_table *basetable,
 300     struct g_part_entry *baseentry, struct g_part_parms *gpp)
 301 {
 302         struct g_part_pc98_entry *entry;
 303
 304         if (gpp->gpp_parms & G_PART_PARM_LABEL)
 305                 return (EINVAL);
 306
 307         entry = (struct g_part_pc98_entry *)baseentry;
 308         if (gpp->gpp_parms & G_PART_PARM_TYPE)
 309                 return (pc98_parse_type(gpp->gpp_type, &entry->ent.dp_mid,
 310                     &entry->ent.dp_sid));
 311         return (0);
 312 }
 313
 314 static int
 315 g_part_pc98_resize(struct g_part_table *basetable,
 316     struct g_part_entry *baseentry, struct g_part_parms *gpp)
 317 {
 318         struct g_part_pc98_entry *entry;
 319         uint32_t size, cyl;
 320
 321         cyl = basetable->gpt_heads * basetable->gpt_sectors;
 322         size = gpp->gpp_size;
 323
 324         if (size < cyl)
 325                 return (EINVAL);
 326         if (size % cyl)
 327                 size = size - (size % cyl);
 328         if (size < cyl)
 329                 return (EINVAL);
 330
 331         entry = (struct g_part_pc98_entry *)baseentry;
 332         baseentry->gpe_end = baseentry->gpe_start + size - 1;
 333         pc98_set_chs(basetable, baseentry->gpe_end, &entry->ent.dp_ecyl,
 334             &entry->ent.dp_ehd, &entry->ent.dp_esect);
 335
 336         return (0);
 337 }
 338
 339 static const char *
 340 g_part_pc98_name(struct g_part_table *table, struct g_part_entry *baseentry,
 341     char *buf, size_t bufsz)
 342 {
 343
 344         snprintf(buf, bufsz, "s%d", baseentry->gpe_index);
 345         return (buf);
 346 }
 347
 348 static int
 349 g_part_pc98_probe(struct g_part_table *table, struct g_consumer *cp)
 350 {
 351         struct g_provider *pp;
 352         u_char *buf, *p;
 353         int error, index, res, sum;
 354         uint16_t magic, ecyl, scyl;
 355
 356         pp = cp->provider;
 357
 358         /* Sanity-check the provider. */
 359         if (pp->sectorsize < SECSIZE || pp->mediasize < 2 * SECSIZE)
 360                 return (ENOSPC);
 361         if (pp->sectorsize > SECSIZE)
 362                 return (ENXIO);
 363
 364         /* Check that there's a PC98 partition table. */
 365         buf = g_read_data(cp, 0L, 2 * SECSIZE, &error);
 366         if (buf == NULL)
 367                 return (error);
 368
 369         /* We goto out on mismatch. */
 370         res = ENXIO;
 371
 372         magic = le16dec(buf + DOSMAGICOFFSET);
 373         if (magic != DOSMAGIC)
 374                 goto out;
 375
 376         sum = 0;
 377         for (index = SECSIZE; index < 2 * SECSIZE; index++)
 378                 sum += buf[index];
 379         if (sum == 0) {
 380                 res = G_PART_PROBE_PRI_LOW;
 381                 goto out;
 382         }
 383
 384         for (index = 0; index < NDOSPART; index++) {
 385                 p = buf + SECSIZE + index * DOSPARTSIZE;
 386                 if (p[0] == 0 || p[1] == 0)     /* !dp_mid || !dp_sid */
 387                         continue;
 388                 scyl = le16dec(p + 10);
 389                 ecyl = le16dec(p + 14);
 390                 if (scyl == 0 || ecyl == 0)
 391                         goto out;
 392                 if (p[8] == p[12] &&            /* dp_ssect == dp_esect */
 393                     p[9] == p[13] &&            /* dp_shd == dp_ehd */
 394                     scyl == ecyl)
 395                         goto out;
 396         }
 397
 398         res = G_PART_PROBE_PRI_HIGH;
 399
 400  out:
 401         g_free(buf);
 402         return (res);
 403 }
 404
 405 static int
 406 g_part_pc98_read(struct g_part_table *basetable, struct g_consumer *cp)
 407 {
 408         struct pc98_partition ent;
 409         struct g_provider *pp;
 410         struct g_part_pc98_table *table;
 411         struct g_part_pc98_entry *entry;
 412         u_char *buf, *p;
 413         off_t msize;
 414         off_t start, end;
 415         u_int cyl;
 416         int error, index;
 417
 418         pp = cp->provider;
 419         table = (struct g_part_pc98_table *)basetable;
 420         msize = pp->mediasize / SECSIZE;
 421
 422         buf = g_read_data(cp, 0L, 2 * SECSIZE, &error);
 423         if (buf == NULL)
 424                 return (error);
 425
 426         cyl = basetable->gpt_heads * basetable->gpt_sectors;
 427
 428         bcopy(buf, table->boot, sizeof(table->boot));
 429         bcopy(buf + SECSIZE, table->table, sizeof(table->table));
 430
 431         for (index = NDOSPART - 1; index >= 0; index--) {
 432                 p = buf + SECSIZE + index * DOSPARTSIZE;
 433                 ent.dp_mid = p[0];
 434                 ent.dp_sid = p[1];
 435                 ent.dp_dum1 = p[2];
 436                 ent.dp_dum2 = p[3];
 437                 ent.dp_ipl_sct = p[4];
 438                 ent.dp_ipl_head = p[5];
 439                 ent.dp_ipl_cyl = le16dec(p + 6);
 440                 ent.dp_ssect = p[8];
 441                 ent.dp_shd = p[9];
 442                 ent.dp_scyl = le16dec(p + 10);
 443                 ent.dp_esect = p[12];
 444                 ent.dp_ehd = p[13];
 445                 ent.dp_ecyl = le16dec(p + 14);
 446                 bcopy(p + 16, ent.dp_name, sizeof(ent.dp_name));
 447                 if (ent.dp_sid == 0)
 448                         continue;
 449
 450                 start = ent.dp_scyl * cyl;
 451                 end = (ent.dp_ecyl + 1) * cyl - 1;
 452                 entry = (struct g_part_pc98_entry *)g_part_new_entry(basetable,
 453                     index + 1, start, end);
 454                 entry->ent = ent;
 455         }
 456
 457         basetable->gpt_entries = NDOSPART;
 458         basetable->gpt_first = cyl;
 459         basetable->gpt_last = msize - (msize % cyl) - 1;
 460
 461         g_free(buf);
 462         return (0);
 463 }
 464
 465 static int
 466 g_part_pc98_setunset(struct g_part_table *table, struct g_part_entry *baseentry,
 467     const char *attrib, unsigned int set)
 468 {
 469         struct g_part_entry *iter;
 470         struct g_part_pc98_entry *entry;
 471         int changed, mid, sid;
 472
 473         mid = sid = 0;
 474         if (strcasecmp(attrib, "active") == 0)
 475                 sid = 1;
 476         else if (strcasecmp(attrib, "bootable") == 0)
 477                 mid = 1;
 478         if (mid == 0 && sid == 0)
 479                 return (EINVAL);
 480
 481         LIST_FOREACH(iter, &table->gpt_entry, gpe_entry) {
 482                 if (iter->gpe_deleted)
 483                         continue;
 484                 if (iter != baseentry)
 485                         continue;
 486                 changed = 0;
 487                 entry = (struct g_part_pc98_entry *)iter;
 488                 if (set) {
 489                         if (mid && !(entry->ent.dp_mid & PC98_MID_BOOTABLE)) {
 490                                 entry->ent.dp_mid |= PC98_MID_BOOTABLE;
 491                                 changed = 1;
 492                         }
 493                         if (sid && !(entry->ent.dp_sid & PC98_SID_ACTIVE)) {
 494                                 entry->ent.dp_sid |= PC98_SID_ACTIVE;
 495                                 changed = 1;
 496                         }
 497                 } else {
 498                         if (mid && (entry->ent.dp_mid & PC98_MID_BOOTABLE)) {
 499                                 entry->ent.dp_mid &= ~PC98_MID_BOOTABLE;
 500                                 changed = 1;
 501                         }
 502                         if (sid && (entry->ent.dp_sid & PC98_SID_ACTIVE)) {
 503                                 entry->ent.dp_sid &= ~PC98_SID_ACTIVE;
 504                                 changed = 1;
 505                         }
 506                 }
 507                 if (changed && !iter->gpe_created)
 508                         iter->gpe_modified = 1;
 509         }
 510         return (0);
 511 }
 512
 513 static const char *
 514 g_part_pc98_type(struct g_part_table *basetable, struct g_part_entry *baseentry,
 515     char *buf, size_t bufsz)
 516 {
 517         struct g_part_pc98_entry *entry;
 518         u_int type;
 519
 520         entry = (struct g_part_pc98_entry *)baseentry;
 521         type = (entry->ent.dp_mid & PC98_MID_MASK) |
 522             ((entry->ent.dp_sid & PC98_SID_MASK) << 8);
 523         if (type == (PC98_MID_386BSD | (PC98_SID_386BSD << 8)))
 524                 return (g_part_alias_name(G_PART_ALIAS_FREEBSD));
 525         snprintf(buf, bufsz, "!%d", type);
 526         return (buf);
 527 }
 528
 529 static int
 530 g_part_pc98_write(struct g_part_table *basetable, struct g_consumer *cp)
 531 {
 532         struct g_part_entry *baseentry;
 533         struct g_part_pc98_entry *entry;
 534         struct g_part_pc98_table *table;
 535         u_char *p;
 536         int error, index;
 537
 538         table = (struct g_part_pc98_table *)basetable;
 539         baseentry = LIST_FIRST(&basetable->gpt_entry);
 540         for (index = 1; index <= basetable->gpt_entries; index++) {
 541                 p = table->table + (index - 1) * DOSPARTSIZE;
 542                 entry = (baseentry != NULL && index == baseentry->gpe_index)
 543                     ? (struct g_part_pc98_entry *)baseentry : NULL;
 544                 if (entry != NULL && !baseentry->gpe_deleted) {
 545                         p[0] = entry->ent.dp_mid;
 546                         p[1] = entry->ent.dp_sid;
 547                         p[2] = entry->ent.dp_dum1;
 548                         p[3] = entry->ent.dp_dum2;
 549                         p[4] = entry->ent.dp_ipl_sct;
 550                         p[5] = entry->ent.dp_ipl_head;
 551                         le16enc(p + 6, entry->ent.dp_ipl_cyl);
 552                         p[8] = entry->ent.dp_ssect;
 553                         p[9] = entry->ent.dp_shd;
 554                         le16enc(p + 10, entry->ent.dp_scyl);
 555                         p[12] = entry->ent.dp_esect;
 556                         p[13] = entry->ent.dp_ehd;
 557                         le16enc(p + 14, entry->ent.dp_ecyl);
 558                         bcopy(entry->ent.dp_name, p + 16,
 559                             sizeof(entry->ent.dp_name));
 560                 } else
 561                         bzero(p, DOSPARTSIZE);
 562
 563                 if (entry != NULL)
 564                         baseentry = LIST_NEXT(baseentry, gpe_entry);
 565         }
 566
 567         error = g_write_data(cp, 0, table->boot, SECSIZE);
 568         if (!error)
 569                 error = g_write_data(cp, SECSIZE, table->table, SECSIZE);
 570         return (error);
 571 }