sys/geom/part/g_part_gpt.c

   1 /*-
   2  * Copyright (c) 2002, 2005, 2006, 2007 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/diskmbr.h>
  33 #include <sys/endian.h>
  34 #include <sys/gpt.h>
  35 #include <sys/kernel.h>
  36 #include <sys/kobj.h>
  37 #include <sys/limits.h>
  38 #include <sys/lock.h>
  39 #include <sys/malloc.h>
  40 #include <sys/mutex.h>
  41 #include <sys/queue.h>
  42 #include <sys/sbuf.h>
  43 #include <sys/systm.h>
  44 #include <sys/uuid.h>
  45 #include <geom/geom.h>
  46 #include <geom/part/g_part.h>
  47
  48 #include "g_part_if.h"
  49
  50 CTASSERT(offsetof(struct gpt_hdr, padding) == 92);
  51 CTASSERT(sizeof(struct gpt_ent) == 128);
  52
  53 #define EQUUID(a,b)     (memcmp(a, b, sizeof(struct uuid)) == 0)
  54
  55 #define MBRSIZE         512
  56
  57 enum gpt_elt {
  58         GPT_ELT_PRIHDR,
  59         GPT_ELT_PRITBL,
  60         GPT_ELT_SECHDR,
  61         GPT_ELT_SECTBL,
  62         GPT_ELT_COUNT
  63 };
  64
  65 enum gpt_state {
  66         GPT_STATE_UNKNOWN,      /* Not determined. */
  67         GPT_STATE_MISSING,      /* No signature found. */
  68         GPT_STATE_CORRUPT,      /* Checksum mismatch. */
  69         GPT_STATE_INVALID,      /* Nonconformant/invalid. */
  70         GPT_STATE_OK            /* Perfectly fine. */
  71 };
  72
  73 struct g_part_gpt_table {
  74         struct g_part_table     base;
  75         u_char                  mbr[MBRSIZE];
  76         struct gpt_hdr          *hdr;
  77         quad_t                  lba[GPT_ELT_COUNT];
  78         enum gpt_state          state[GPT_ELT_COUNT];
  79 };
  80
  81 struct g_part_gpt_entry {
  82         struct g_part_entry     base;
  83         struct gpt_ent          ent;
  84 };
  85
  86 static void g_gpt_printf_utf16(struct sbuf *, uint16_t *, size_t);
  87 static void g_gpt_utf8_to_utf16(const uint8_t *, uint16_t *, size_t);
  88
  89 static int g_part_gpt_add(struct g_part_table *, struct g_part_entry *,
  90     struct g_part_parms *);
  91 static int g_part_gpt_bootcode(struct g_part_table *, struct g_part_parms *);
  92 static int g_part_gpt_create(struct g_part_table *, struct g_part_parms *);
  93 static int g_part_gpt_destroy(struct g_part_table *, struct g_part_parms *);
  94 static void g_part_gpt_dumpconf(struct g_part_table *, struct g_part_entry *,
  95     struct sbuf *, const char *);
  96 static int g_part_gpt_dumpto(struct g_part_table *, struct g_part_entry *);
  97 static int g_part_gpt_modify(struct g_part_table *, struct g_part_entry *,
  98     struct g_part_parms *);
  99 static const char *g_part_gpt_name(struct g_part_table *, struct g_part_entry *,
 100     char *, size_t);
 101 static int g_part_gpt_probe(struct g_part_table *, struct g_consumer *);
 102 static int g_part_gpt_read(struct g_part_table *, struct g_consumer *);
 103 static int g_part_gpt_setunset(struct g_part_table *table,
 104     struct g_part_entry *baseentry, const char *attrib, unsigned int set);
 105 static const char *g_part_gpt_type(struct g_part_table *, struct g_part_entry *,
 106     char *, size_t);
 107 static int g_part_gpt_write(struct g_part_table *, struct g_consumer *);
 108 static int g_part_gpt_resize(struct g_part_table *, struct g_part_entry *,
 109     struct g_part_parms *);
 110 static int g_part_gpt_recover(struct g_part_table *);
 111
 112 static kobj_method_t g_part_gpt_methods[] = {
 113         KOBJMETHOD(g_part_add,          g_part_gpt_add),
 114         KOBJMETHOD(g_part_bootcode,     g_part_gpt_bootcode),
 115         KOBJMETHOD(g_part_create,       g_part_gpt_create),
 116         KOBJMETHOD(g_part_destroy,      g_part_gpt_destroy),
 117         KOBJMETHOD(g_part_dumpconf,     g_part_gpt_dumpconf),
 118         KOBJMETHOD(g_part_dumpto,       g_part_gpt_dumpto),
 119         KOBJMETHOD(g_part_modify,       g_part_gpt_modify),
 120         KOBJMETHOD(g_part_resize,       g_part_gpt_resize),
 121         KOBJMETHOD(g_part_name,         g_part_gpt_name),
 122         KOBJMETHOD(g_part_probe,        g_part_gpt_probe),
 123         KOBJMETHOD(g_part_read,         g_part_gpt_read),
 124         KOBJMETHOD(g_part_recover,      g_part_gpt_recover),
 125         KOBJMETHOD(g_part_setunset,     g_part_gpt_setunset),
 126         KOBJMETHOD(g_part_type,         g_part_gpt_type),
 127         KOBJMETHOD(g_part_write,        g_part_gpt_write),
 128         { 0, 0 }
 129 };
 130
 131 static struct g_part_scheme g_part_gpt_scheme = {
 132         "GPT",
 133         g_part_gpt_methods,
 134         sizeof(struct g_part_gpt_table),
 135         .gps_entrysz = sizeof(struct g_part_gpt_entry),
 136         .gps_minent = 128,
 137         .gps_maxent = INT_MAX,
 138         .gps_bootcodesz = MBRSIZE,
 139 };
 140 G_PART_SCHEME_DECLARE(g_part_gpt);
 141
 142 static struct uuid gpt_uuid_apple_boot = GPT_ENT_TYPE_APPLE_BOOT;
 143 static struct uuid gpt_uuid_apple_hfs = GPT_ENT_TYPE_APPLE_HFS;
 144 static struct uuid gpt_uuid_apple_label = GPT_ENT_TYPE_APPLE_LABEL;
 145 static struct uuid gpt_uuid_apple_raid = GPT_ENT_TYPE_APPLE_RAID;
 146 static struct uuid gpt_uuid_apple_raid_offline = GPT_ENT_TYPE_APPLE_RAID_OFFLINE;
 147 static struct uuid gpt_uuid_apple_tv_recovery = GPT_ENT_TYPE_APPLE_TV_RECOVERY;
 148 static struct uuid gpt_uuid_apple_ufs = GPT_ENT_TYPE_APPLE_UFS;
 149 static struct uuid gpt_uuid_efi = GPT_ENT_TYPE_EFI;
 150 static struct uuid gpt_uuid_freebsd = GPT_ENT_TYPE_FREEBSD;
 151 static struct uuid gpt_uuid_freebsd_boot = GPT_ENT_TYPE_FREEBSD_BOOT;
 152 static struct uuid gpt_uuid_freebsd_swap = GPT_ENT_TYPE_FREEBSD_SWAP;
 153 static struct uuid gpt_uuid_freebsd_ufs = GPT_ENT_TYPE_FREEBSD_UFS;
 154 static struct uuid gpt_uuid_freebsd_vinum = GPT_ENT_TYPE_FREEBSD_VINUM;
 155 static struct uuid gpt_uuid_freebsd_zfs = GPT_ENT_TYPE_FREEBSD_ZFS;
 156 static struct uuid gpt_uuid_linux_data = GPT_ENT_TYPE_LINUX_DATA;
 157 static struct uuid gpt_uuid_linux_lvm = GPT_ENT_TYPE_LINUX_LVM;
 158 static struct uuid gpt_uuid_linux_raid = GPT_ENT_TYPE_LINUX_RAID;
 159 static struct uuid gpt_uuid_linux_swap = GPT_ENT_TYPE_LINUX_SWAP;
 160 static struct uuid gpt_uuid_ms_basic_data = GPT_ENT_TYPE_MS_BASIC_DATA;
 161 static struct uuid gpt_uuid_ms_reserved = GPT_ENT_TYPE_MS_RESERVED;
 162 static struct uuid gpt_uuid_ms_ldm_data = GPT_ENT_TYPE_MS_LDM_DATA;
 163 static struct uuid gpt_uuid_ms_ldm_metadata = GPT_ENT_TYPE_MS_LDM_METADATA;
 164 static struct uuid gpt_uuid_netbsd_ccd = GPT_ENT_TYPE_NETBSD_CCD;
 165 static struct uuid gpt_uuid_netbsd_cgd = GPT_ENT_TYPE_NETBSD_CGD;
 166 static struct uuid gpt_uuid_netbsd_ffs = GPT_ENT_TYPE_NETBSD_FFS;
 167 static struct uuid gpt_uuid_netbsd_lfs = GPT_ENT_TYPE_NETBSD_LFS;
 168 static struct uuid gpt_uuid_netbsd_raid = GPT_ENT_TYPE_NETBSD_RAID;
 169 static struct uuid gpt_uuid_netbsd_swap = GPT_ENT_TYPE_NETBSD_SWAP;
 170 static struct uuid gpt_uuid_mbr = GPT_ENT_TYPE_MBR;
 171 static struct uuid gpt_uuid_unused = GPT_ENT_TYPE_UNUSED;
 172
 173 static struct g_part_uuid_alias {
 174         struct uuid *uuid;
 175         int alias;
 176 } gpt_uuid_alias_match[] = {
 177         { &gpt_uuid_apple_boot,         G_PART_ALIAS_APPLE_BOOT },
 178         { &gpt_uuid_apple_hfs,          G_PART_ALIAS_APPLE_HFS },
 179         { &gpt_uuid_apple_label,        G_PART_ALIAS_APPLE_LABEL },
 180         { &gpt_uuid_apple_raid,         G_PART_ALIAS_APPLE_RAID },
 181         { &gpt_uuid_apple_raid_offline, G_PART_ALIAS_APPLE_RAID_OFFLINE },
 182         { &gpt_uuid_apple_tv_recovery,  G_PART_ALIAS_APPLE_TV_RECOVERY },
 183         { &gpt_uuid_apple_ufs,          G_PART_ALIAS_APPLE_UFS },
 184         { &gpt_uuid_efi,                G_PART_ALIAS_EFI },
 185         { &gpt_uuid_freebsd,            G_PART_ALIAS_FREEBSD },
 186         { &gpt_uuid_freebsd_boot,       G_PART_ALIAS_FREEBSD_BOOT },
 187         { &gpt_uuid_freebsd_swap,       G_PART_ALIAS_FREEBSD_SWAP },
 188         { &gpt_uuid_freebsd_ufs,        G_PART_ALIAS_FREEBSD_UFS },
 189         { &gpt_uuid_freebsd_vinum,      G_PART_ALIAS_FREEBSD_VINUM },
 190         { &gpt_uuid_freebsd_zfs,        G_PART_ALIAS_FREEBSD_ZFS },
 191         { &gpt_uuid_linux_data,         G_PART_ALIAS_LINUX_DATA },
 192         { &gpt_uuid_linux_lvm,          G_PART_ALIAS_LINUX_LVM },
 193         { &gpt_uuid_linux_raid,         G_PART_ALIAS_LINUX_RAID },
 194         { &gpt_uuid_linux_swap,         G_PART_ALIAS_LINUX_SWAP },
 195         { &gpt_uuid_mbr,                G_PART_ALIAS_MBR },
 196         { &gpt_uuid_ms_basic_data,      G_PART_ALIAS_MS_BASIC_DATA },
 197         { &gpt_uuid_ms_ldm_data,        G_PART_ALIAS_MS_LDM_DATA },
 198         { &gpt_uuid_ms_ldm_metadata,    G_PART_ALIAS_MS_LDM_METADATA },
 199         { &gpt_uuid_ms_reserved,        G_PART_ALIAS_MS_RESERVED },
 200         { &gpt_uuid_netbsd_ccd,         G_PART_ALIAS_NETBSD_CCD },
 201         { &gpt_uuid_netbsd_cgd,         G_PART_ALIAS_NETBSD_CGD },
 202         { &gpt_uuid_netbsd_ffs,         G_PART_ALIAS_NETBSD_FFS },
 203         { &gpt_uuid_netbsd_lfs,         G_PART_ALIAS_NETBSD_LFS },
 204         { &gpt_uuid_netbsd_raid,        G_PART_ALIAS_NETBSD_RAID },
 205         { &gpt_uuid_netbsd_swap,        G_PART_ALIAS_NETBSD_SWAP },
 206
 207         { NULL, 0 }
 208 };
 209
 210 static struct gpt_hdr *
 211 gpt_read_hdr(struct g_part_gpt_table *table, struct g_consumer *cp,
 212     enum gpt_elt elt)
 213 {
 214         struct gpt_hdr *buf, *hdr;
 215         struct g_provider *pp;
 216         quad_t lba, last;
 217         int error;
 218         uint32_t crc, sz;
 219
 220         pp = cp->provider;
 221         last = (pp->mediasize / pp->sectorsize) - 1;
 222         table->state[elt] = GPT_STATE_MISSING;
 223         /*
 224          * If the primary header is valid look for secondary
 225          * header in AlternateLBA, otherwise in the last medium's LBA.
 226          */
 227         if (elt == GPT_ELT_SECHDR) {
 228                 if (table->state[GPT_ELT_PRIHDR] != GPT_STATE_OK)
 229                         table->lba[elt] = last;
 230         } else
 231                 table->lba[elt] = 1;
 232         buf = g_read_data(cp, table->lba[elt] * pp->sectorsize, pp->sectorsize,
 233             &error);
 234         if (buf == NULL)
 235                 return (NULL);
 236         hdr = NULL;
 237         if (memcmp(buf->hdr_sig, GPT_HDR_SIG, sizeof(buf->hdr_sig)) != 0)
 238                 goto fail;
 239
 240         table->state[elt] = GPT_STATE_CORRUPT;
 241         sz = le32toh(buf->hdr_size);
 242         if (sz < 92 || sz > pp->sectorsize)
 243                 goto fail;
 244
 245         hdr = g_malloc(sz, M_WAITOK | M_ZERO);
 246         bcopy(buf, hdr, sz);
 247         hdr->hdr_size = sz;
 248
 249         crc = le32toh(buf->hdr_crc_self);
 250         buf->hdr_crc_self = 0;
 251         if (crc32(buf, sz) != crc)
 252                 goto fail;
 253         hdr->hdr_crc_self = crc;
 254
 255         table->state[elt] = GPT_STATE_INVALID;
 256         hdr->hdr_revision = le32toh(buf->hdr_revision);
 257         if (hdr->hdr_revision < GPT_HDR_REVISION)
 258                 goto fail;
 259         hdr->hdr_lba_self = le64toh(buf->hdr_lba_self);
 260         if (hdr->hdr_lba_self != table->lba[elt])
 261                 goto fail;
 262         hdr->hdr_lba_alt = le64toh(buf->hdr_lba_alt);
 263         if (hdr->hdr_lba_alt == hdr->hdr_lba_self ||
 264             hdr->hdr_lba_alt > last)
 265                 goto fail;
 266
 267         /* Check the managed area. */
 268         hdr->hdr_lba_start = le64toh(buf->hdr_lba_start);
 269         if (hdr->hdr_lba_start < 2 || hdr->hdr_lba_start >= last)
 270                 goto fail;
 271         hdr->hdr_lba_end = le64toh(buf->hdr_lba_end);
 272         if (hdr->hdr_lba_end < hdr->hdr_lba_start || hdr->hdr_lba_end >= last)
 273                 goto fail;
 274
 275         /* Check the table location and size of the table. */
 276         hdr->hdr_entries = le32toh(buf->hdr_entries);
 277         hdr->hdr_entsz = le32toh(buf->hdr_entsz);
 278         if (hdr->hdr_entries == 0 || hdr->hdr_entsz < 128 ||
 279             (hdr->hdr_entsz & 7) != 0)
 280                 goto fail;
 281         hdr->hdr_lba_table = le64toh(buf->hdr_lba_table);
 282         if (hdr->hdr_lba_table < 2 || hdr->hdr_lba_table >= last)
 283                 goto fail;
 284         if (hdr->hdr_lba_table >= hdr->hdr_lba_start &&
 285             hdr->hdr_lba_table <= hdr->hdr_lba_end)
 286                 goto fail;
 287         lba = hdr->hdr_lba_table +
 288             (hdr->hdr_entries * hdr->hdr_entsz + pp->sectorsize - 1) /
 289             pp->sectorsize - 1;
 290         if (lba >= last)
 291                 goto fail;
 292         if (lba >= hdr->hdr_lba_start && lba <= hdr->hdr_lba_end)
 293                 goto fail;
 294
 295         table->state[elt] = GPT_STATE_OK;
 296         le_uuid_dec(&buf->hdr_uuid, &hdr->hdr_uuid);
 297         hdr->hdr_crc_table = le32toh(buf->hdr_crc_table);
 298
 299         /* save LBA for secondary header */
 300         if (elt == GPT_ELT_PRIHDR)
 301                 table->lba[GPT_ELT_SECHDR] = hdr->hdr_lba_alt;
 302
 303         g_free(buf);
 304         return (hdr);
 305
 306  fail:
 307         if (hdr != NULL)
 308                 g_free(hdr);
 309         g_free(buf);
 310         return (NULL);
 311 }
 312
 313 static struct gpt_ent *
 314 gpt_read_tbl(struct g_part_gpt_table *table, struct g_consumer *cp,
 315     enum gpt_elt elt, struct gpt_hdr *hdr)
 316 {
 317         struct g_provider *pp;
 318         struct gpt_ent *ent, *tbl;
 319         char *buf, *p;
 320         unsigned int idx, sectors, tblsz;
 321         int error;
 322
 323         if (hdr == NULL)
 324                 return (NULL);
 325
 326         pp = cp->provider;
 327         table->lba[elt] = hdr->hdr_lba_table;
 328
 329         table->state[elt] = GPT_STATE_MISSING;
 330         tblsz = hdr->hdr_entries * hdr->hdr_entsz;
 331         sectors = (tblsz + pp->sectorsize - 1) / pp->sectorsize;
 332         buf = g_read_data(cp, table->lba[elt] * pp->sectorsize,
 333             sectors * pp->sectorsize, &error);
 334         if (buf == NULL)
 335                 return (NULL);
 336
 337         table->state[elt] = GPT_STATE_CORRUPT;
 338         if (crc32(buf, tblsz) != hdr->hdr_crc_table) {
 339                 g_free(buf);
 340                 return (NULL);
 341         }
 342
 343         table->state[elt] = GPT_STATE_OK;
 344         tbl = g_malloc(hdr->hdr_entries * sizeof(struct gpt_ent),
 345             M_WAITOK | M_ZERO);
 346
 347         for (idx = 0, ent = tbl, p = buf;
 348              idx < hdr->hdr_entries;
 349              idx++, ent++, p += hdr->hdr_entsz) {
 350                 le_uuid_dec(p, &ent->ent_type);
 351                 le_uuid_dec(p + 16, &ent->ent_uuid);
 352                 ent->ent_lba_start = le64dec(p + 32);
 353                 ent->ent_lba_end = le64dec(p + 40);
 354                 ent->ent_attr = le64dec(p + 48);
 355                 /* Keep UTF-16 in little-endian. */
 356                 bcopy(p + 56, ent->ent_name, sizeof(ent->ent_name));
 357         }
 358
 359         g_free(buf);
 360         return (tbl);
 361 }
 362
 363 static int
 364 gpt_matched_hdrs(struct gpt_hdr *pri, struct gpt_hdr *sec)
 365 {
 366
 367         if (pri == NULL || sec == NULL)
 368                 return (0);
 369
 370         if (!EQUUID(&pri->hdr_uuid, &sec->hdr_uuid))
 371                 return (0);
 372         return ((pri->hdr_revision == sec->hdr_revision &&
 373             pri->hdr_size == sec->hdr_size &&
 374             pri->hdr_lba_start == sec->hdr_lba_start &&
 375             pri->hdr_lba_end == sec->hdr_lba_end &&
 376             pri->hdr_entries == sec->hdr_entries &&
 377             pri->hdr_entsz == sec->hdr_entsz &&
 378             pri->hdr_crc_table == sec->hdr_crc_table) ? 1 : 0);
 379 }
 380
 381 static int
 382 gpt_parse_type(const char *type, struct uuid *uuid)
 383 {
 384         struct uuid tmp;
 385         const char *alias;
 386         int error;
 387         struct g_part_uuid_alias *uap;
 388
 389         if (type[0] == '!') {
 390                 error = parse_uuid(type + 1, &tmp);
 391                 if (error)
 392                         return (error);
 393                 if (EQUUID(&tmp, &gpt_uuid_unused))
 394                         return (EINVAL);
 395                 *uuid = tmp;
 396                 return (0);
 397         }
 398         for (uap = &gpt_uuid_alias_match[0]; uap->uuid; uap++) {
 399                 alias = g_part_alias_name(uap->alias);
 400                 if (!strcasecmp(type, alias)) {
 401                         *uuid = *uap->uuid;
 402                         return (0);
 403                 }
 404         }
 405         return (EINVAL);
 406 }
 407
 408 static int
 409 g_part_gpt_add(struct g_part_table *basetable, struct g_part_entry *baseentry,
 410     struct g_part_parms *gpp)
 411 {
 412         struct g_part_gpt_entry *entry;
 413         int error;
 414
 415         entry = (struct g_part_gpt_entry *)baseentry;
 416         error = gpt_parse_type(gpp->gpp_type, &entry->ent.ent_type);
 417         if (error)
 418                 return (error);
 419         kern_uuidgen(&entry->ent.ent_uuid, 1);
 420         entry->ent.ent_lba_start = baseentry->gpe_start;
 421         entry->ent.ent_lba_end = baseentry->gpe_end;
 422         if (baseentry->gpe_deleted) {
 423                 entry->ent.ent_attr = 0;
 424                 bzero(entry->ent.ent_name, sizeof(entry->ent.ent_name));
 425         }
 426         if (gpp->gpp_parms & G_PART_PARM_LABEL)
 427                 g_gpt_utf8_to_utf16(gpp->gpp_label, entry->ent.ent_name,
 428                     sizeof(entry->ent.ent_name));
 429         return (0);
 430 }
 431
 432 static int
 433 g_part_gpt_bootcode(struct g_part_table *basetable, struct g_part_parms *gpp)
 434 {
 435         struct g_part_gpt_table *table;
 436         size_t codesz;
 437
 438         codesz = DOSPARTOFF;
 439         table = (struct g_part_gpt_table *)basetable;
 440         bzero(table->mbr, codesz);
 441         codesz = MIN(codesz, gpp->gpp_codesize);
 442         if (codesz > 0)
 443                 bcopy(gpp->gpp_codeptr, table->mbr, codesz);
 444
 445         /* Mark the PMBR active since some BIOS require it */
 446         table->mbr[DOSPARTOFF] = 0x80;          /* status */
 447         return (0);
 448 }
 449
 450 static int
 451 g_part_gpt_create(struct g_part_table *basetable, struct g_part_parms *gpp)
 452 {
 453         struct g_provider *pp;
 454         struct g_part_gpt_table *table;
 455         quad_t last;
 456         size_t tblsz;
 457
 458         /* We don't nest, which means that our depth should be 0. */
 459         if (basetable->gpt_depth != 0)
 460                 return (ENXIO);
 461
 462         table = (struct g_part_gpt_table *)basetable;
 463         pp = gpp->gpp_provider;
 464         tblsz = (basetable->gpt_entries * sizeof(struct gpt_ent) +
 465             pp->sectorsize - 1) / pp->sectorsize;
 466         if (pp->sectorsize < MBRSIZE ||
 467             pp->mediasize < (3 + 2 * tblsz + basetable->gpt_entries) *
 468             pp->sectorsize)
 469                 return (ENOSPC);
 470
 471         last = (pp->mediasize / pp->sectorsize) - 1;
 472
 473         le16enc(table->mbr + DOSMAGICOFFSET, DOSMAGIC);
 474         table->mbr[DOSPARTOFF + 1] = 0x01;              /* shd */
 475         table->mbr[DOSPARTOFF + 2] = 0x01;              /* ssect */
 476         table->mbr[DOSPARTOFF + 3] = 0x00;              /* scyl */
 477         table->mbr[DOSPARTOFF + 4] = 0xee;              /* typ */
 478         table->mbr[DOSPARTOFF + 5] = 0xff;              /* ehd */
 479         table->mbr[DOSPARTOFF + 6] = 0xff;              /* esect */
 480         table->mbr[DOSPARTOFF + 7] = 0xff;              /* ecyl */
 481         le32enc(table->mbr + DOSPARTOFF + 8, 1);        /* start */
 482         le32enc(table->mbr + DOSPARTOFF + 12, MIN(last, 0xffffffffLL));
 483
 484         table->lba[GPT_ELT_PRIHDR] = 1;
 485         table->lba[GPT_ELT_PRITBL] = 2;
 486         table->lba[GPT_ELT_SECHDR] = last;
 487         table->lba[GPT_ELT_SECTBL] = last - tblsz;
 488
 489         /* Allocate space for the header */
 490         table->hdr = g_malloc(sizeof(struct gpt_hdr), M_WAITOK | M_ZERO);
 491
 492         bcopy(GPT_HDR_SIG, table->hdr->hdr_sig, sizeof(table->hdr->hdr_sig));
 493         table->hdr->hdr_revision = GPT_HDR_REVISION;
 494         table->hdr->hdr_size = offsetof(struct gpt_hdr, padding);
 495         table->hdr->hdr_lba_start = 2 + tblsz;
 496         table->hdr->hdr_lba_end = last - tblsz - 1;
 497         kern_uuidgen(&table->hdr->hdr_uuid, 1);
 498         table->hdr->hdr_entries = basetable->gpt_entries;
 499         table->hdr->hdr_entsz = sizeof(struct gpt_ent);
 500
 501         basetable->gpt_first = table->hdr->hdr_lba_start;
 502         basetable->gpt_last = table->hdr->hdr_lba_end;
 503         return (0);
 504 }
 505
 506 static int
 507 g_part_gpt_destroy(struct g_part_table *basetable, struct g_part_parms *gpp)
 508 {
 509         struct g_part_gpt_table *table;
 510         struct g_provider *pp;
 511
 512         table = (struct g_part_gpt_table *)basetable;
 513         pp = LIST_FIRST(&basetable->gpt_gp->consumer)->provider;
 514         g_free(table->hdr);
 515         table->hdr = NULL;
 516
 517         /*
 518          * Wipe the first 2 sectors to clear the partitioning. Wipe the last
 519          * sector only if it has valid secondary header.
 520          */
 521         basetable->gpt_smhead |= 3;
 522         if (table->state[GPT_ELT_SECHDR] == GPT_STATE_OK &&
 523             table->lba[GPT_ELT_SECHDR] == pp->mediasize / pp->sectorsize - 1)
 524                 basetable->gpt_smtail |= 1;
 525         return (0);
 526 }
 527
 528 static void
 529 g_part_gpt_dumpconf(struct g_part_table *table, struct g_part_entry *baseentry,
 530     struct sbuf *sb, const char *indent)
 531 {
 532         struct g_part_gpt_entry *entry;
 533
 534         entry = (struct g_part_gpt_entry *)baseentry;
 535         if (indent == NULL) {
 536                 /* conftxt: libdisk compatibility */
 537                 sbuf_printf(sb, " xs GPT xt ");
 538                 sbuf_printf_uuid(sb, &entry->ent.ent_type);
 539         } else if (entry != NULL) {
 540                 /* confxml: partition entry information */
 541                 sbuf_printf(sb, "%s<label>", indent);
 542                 g_gpt_printf_utf16(sb, entry->ent.ent_name,
 543                     sizeof(entry->ent.ent_name) >> 1);
 544                 sbuf_printf(sb, "</label>\n");
 545                 if (entry->ent.ent_attr & GPT_ENT_ATTR_BOOTME)
 546                         sbuf_printf(sb, "%s<attrib>bootme</attrib>\n", indent);
 547                 if (entry->ent.ent_attr & GPT_ENT_ATTR_BOOTONCE) {
 548                         sbuf_printf(sb, "%s<attrib>bootonce</attrib>\n",
 549                             indent);
 550                 }
 551                 if (entry->ent.ent_attr & GPT_ENT_ATTR_BOOTFAILED) {
 552                         sbuf_printf(sb, "%s<attrib>bootfailed</attrib>\n",
 553                             indent);
 554                 }
 555                 sbuf_printf(sb, "%s<rawtype>", indent);
 556                 sbuf_printf_uuid(sb, &entry->ent.ent_type);
 557                 sbuf_printf(sb, "</rawtype>\n");
 558                 sbuf_printf(sb, "%s<rawuuid>", indent);
 559                 sbuf_printf_uuid(sb, &entry->ent.ent_uuid);
 560                 sbuf_printf(sb, "</rawuuid>\n");
 561         } else {
 562                 /* confxml: scheme information */
 563         }
 564 }
 565
 566 static int
 567 g_part_gpt_dumpto(struct g_part_table *table, struct g_part_entry *baseentry)
 568 {
 569         struct g_part_gpt_entry *entry;
 570
 571         entry = (struct g_part_gpt_entry *)baseentry;
 572         return ((EQUUID(&entry->ent.ent_type, &gpt_uuid_freebsd_swap) ||
 573             EQUUID(&entry->ent.ent_type, &gpt_uuid_linux_swap)) ? 1 : 0);
 574 }
 575
 576 static int
 577 g_part_gpt_modify(struct g_part_table *basetable,
 578     struct g_part_entry *baseentry, struct g_part_parms *gpp)
 579 {
 580         struct g_part_gpt_entry *entry;
 581         int error;
 582
 583         entry = (struct g_part_gpt_entry *)baseentry;
 584         if (gpp->gpp_parms & G_PART_PARM_TYPE) {
 585                 error = gpt_parse_type(gpp->gpp_type, &entry->ent.ent_type);
 586                 if (error)
 587                         return (error);
 588         }
 589         if (gpp->gpp_parms & G_PART_PARM_LABEL)
 590                 g_gpt_utf8_to_utf16(gpp->gpp_label, entry->ent.ent_name,
 591                     sizeof(entry->ent.ent_name));
 592         return (0);
 593 }
 594
 595 static int
 596 g_part_gpt_resize(struct g_part_table *basetable,
 597     struct g_part_entry *baseentry, struct g_part_parms *gpp)
 598 {
 599         struct g_part_gpt_entry *entry;
 600         entry = (struct g_part_gpt_entry *)baseentry;
 601
 602         baseentry->gpe_end = baseentry->gpe_start + gpp->gpp_size - 1;
 603         entry->ent.ent_lba_end = baseentry->gpe_end;
 604
 605         return (0);
 606 }
 607
 608 static const char *
 609 g_part_gpt_name(struct g_part_table *table, struct g_part_entry *baseentry,
 610     char *buf, size_t bufsz)
 611 {
 612         struct g_part_gpt_entry *entry;
 613         char c;
 614
 615         entry = (struct g_part_gpt_entry *)baseentry;
 616         c = (EQUUID(&entry->ent.ent_type, &gpt_uuid_freebsd)) ? 's' : 'p';
 617         snprintf(buf, bufsz, "%c%d", c, baseentry->gpe_index);
 618         return (buf);
 619 }
 620
 621 static int
 622 g_part_gpt_probe(struct g_part_table *table, struct g_consumer *cp)
 623 {
 624         struct g_provider *pp;
 625         char *buf;
 626         int error, res;
 627
 628         /* We don't nest, which means that our depth should be 0. */
 629         if (table->gpt_depth != 0)
 630                 return (ENXIO);
 631
 632         pp = cp->provider;
 633
 634         /*
 635          * Sanity-check the provider. Since the first sector on the provider
 636          * must be a PMBR and a PMBR is 512 bytes large, the sector size
 637          * must be at least 512 bytes.  Also, since the theoretical minimum
 638          * number of sectors needed by GPT is 6, any medium that has less
 639          * than 6 sectors is never going to be able to hold a GPT. The
 640          * number 6 comes from:
 641          *      1 sector for the PMBR
 642          *      2 sectors for the GPT headers (each 1 sector)
 643          *      2 sectors for the GPT tables (each 1 sector)
 644          *      1 sector for an actual partition
 645          * It's better to catch this pathological case early than behaving
 646          * pathologically later on...
 647          */
 648         if (pp->sectorsize < MBRSIZE || pp->mediasize < 6 * pp->sectorsize)
 649                 return (ENOSPC);
 650
 651         /* Check that there's a MBR. */
 652         buf = g_read_data(cp, 0L, pp->sectorsize, &error);
 653         if (buf == NULL)
 654                 return (error);
 655         res = le16dec(buf + DOSMAGICOFFSET);
 656         g_free(buf);
 657         if (res != DOSMAGIC)
 658                 return (ENXIO);
 659
 660         /* Check that there's a primary header. */
 661         buf = g_read_data(cp, pp->sectorsize, pp->sectorsize, &error);
 662         if (buf == NULL)
 663                 return (error);
 664         res = memcmp(buf, GPT_HDR_SIG, 8);
 665         g_free(buf);
 666         if (res == 0)
 667                 return (G_PART_PROBE_PRI_HIGH);
 668
 669         /* No primary? Check that there's a secondary. */
 670         buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize,
 671             &error);
 672         if (buf == NULL)
 673                 return (error);
 674         res = memcmp(buf, GPT_HDR_SIG, 8);
 675         g_free(buf);
 676         return ((res == 0) ? G_PART_PROBE_PRI_HIGH : ENXIO);
 677 }
 678
 679 static int
 680 g_part_gpt_read(struct g_part_table *basetable, struct g_consumer *cp)
 681 {
 682         struct gpt_hdr *prihdr, *sechdr;
 683         struct gpt_ent *tbl, *pritbl, *sectbl;
 684         struct g_provider *pp;
 685         struct g_part_gpt_table *table;
 686         struct g_part_gpt_entry *entry;
 687         u_char *buf;
 688         uint64_t last;
 689         int error, index;
 690
 691         table = (struct g_part_gpt_table *)basetable;
 692         pp = cp->provider;
 693         last = (pp->mediasize / pp->sectorsize) - 1;
 694
 695         /* Read the PMBR */
 696         buf = g_read_data(cp, 0, pp->sectorsize, &error);
 697         if (buf == NULL)
 698                 return (error);
 699         bcopy(buf, table->mbr, MBRSIZE);
 700         g_free(buf);
 701
 702         /* Read the primary header and table. */
 703         prihdr = gpt_read_hdr(table, cp, GPT_ELT_PRIHDR);
 704         if (table->state[GPT_ELT_PRIHDR] == GPT_STATE_OK) {
 705                 pritbl = gpt_read_tbl(table, cp, GPT_ELT_PRITBL, prihdr);
 706         } else {
 707                 table->state[GPT_ELT_PRITBL] = GPT_STATE_MISSING;
 708                 pritbl = NULL;
 709         }
 710
 711         /* Read the secondary header and table. */
 712         sechdr = gpt_read_hdr(table, cp, GPT_ELT_SECHDR);
 713         if (table->state[GPT_ELT_SECHDR] == GPT_STATE_OK) {
 714                 sectbl = gpt_read_tbl(table, cp, GPT_ELT_SECTBL, sechdr);
 715         } else {
 716                 table->state[GPT_ELT_SECTBL] = GPT_STATE_MISSING;
 717                 sectbl = NULL;
 718         }
 719
 720         /* Fail if we haven't got any good tables at all. */
 721         if (table->state[GPT_ELT_PRITBL] != GPT_STATE_OK &&
 722             table->state[GPT_ELT_SECTBL] != GPT_STATE_OK) {
 723                 printf("GEOM: %s: corrupt or invalid GPT detected.\n",
 724                     pp->name);
 725                 printf("GEOM: %s: GPT rejected -- may not be recoverable.\n",
 726                     pp->name);
 727                 return (EINVAL);
 728         }
 729
 730         /*
 731          * If both headers are good but they disagree with each other,
 732          * then invalidate one. We prefer to keep the primary header,
 733          * unless the primary table is corrupt.
 734          */
 735         if (table->state[GPT_ELT_PRIHDR] == GPT_STATE_OK &&
 736             table->state[GPT_ELT_SECHDR] == GPT_STATE_OK &&
 737             !gpt_matched_hdrs(prihdr, sechdr)) {
 738                 if (table->state[GPT_ELT_PRITBL] == GPT_STATE_OK) {
 739                         table->state[GPT_ELT_SECHDR] = GPT_STATE_INVALID;
 740                         table->state[GPT_ELT_SECTBL] = GPT_STATE_MISSING;
 741                         g_free(sechdr);
 742                         sechdr = NULL;
 743                 } else {
 744                         table->state[GPT_ELT_PRIHDR] = GPT_STATE_INVALID;
 745                         table->state[GPT_ELT_PRITBL] = GPT_STATE_MISSING;
 746                         g_free(prihdr);
 747                         prihdr = NULL;
 748                 }
 749         }
 750
 751         if (table->state[GPT_ELT_PRITBL] != GPT_STATE_OK) {
 752                 printf("GEOM: %s: the primary GPT table is corrupt or "
 753                     "invalid.\n", pp->name);
 754                 printf("GEOM: %s: using the secondary instead -- recovery "
 755                     "strongly advised.\n", pp->name);
 756                 table->hdr = sechdr;
 757                 basetable->gpt_corrupt = 1;
 758                 if (prihdr != NULL)
 759                         g_free(prihdr);
 760                 tbl = sectbl;
 761                 if (pritbl != NULL)
 762                         g_free(pritbl);
 763         } else {
 764                 if (table->state[GPT_ELT_SECTBL] != GPT_STATE_OK) {
 765                         printf("GEOM: %s: the secondary GPT table is corrupt "
 766                             "or invalid.\n", pp->name);
 767                         printf("GEOM: %s: using the primary only -- recovery "
 768                             "suggested.\n", pp->name);
 769                         basetable->gpt_corrupt = 1;
 770                 } else if (table->lba[GPT_ELT_SECHDR] != last) {
 771                         printf( "GEOM: %s: the secondary GPT header is not in "
 772                             "the last LBA.\n", pp->name);
 773                         basetable->gpt_corrupt = 1;
 774                 }
 775                 table->hdr = prihdr;
 776                 if (sechdr != NULL)
 777                         g_free(sechdr);
 778                 tbl = pritbl;
 779                 if (sectbl != NULL)
 780                         g_free(sectbl);
 781         }
 782
 783         basetable->gpt_first = table->hdr->hdr_lba_start;
 784         basetable->gpt_last = table->hdr->hdr_lba_end;
 785         basetable->gpt_entries = table->hdr->hdr_entries;
 786
 787         for (index = basetable->gpt_entries - 1; index >= 0; index--) {
 788                 if (EQUUID(&tbl[index].ent_type, &gpt_uuid_unused))
 789                         continue;
 790                 entry = (struct g_part_gpt_entry *)g_part_new_entry(
 791                     basetable, index + 1, tbl[index].ent_lba_start,
 792                     tbl[index].ent_lba_end);
 793                 entry->ent = tbl[index];
 794         }
 795
 796         g_free(tbl);
 797         return (0);
 798 }
 799
 800 static int
 801 g_part_gpt_recover(struct g_part_table *basetable)
 802 {
 803         struct g_part_gpt_table *table;
 804         struct g_provider *pp;
 805         uint64_t last;
 806         size_t tblsz;
 807
 808         table = (struct g_part_gpt_table *)basetable;
 809         pp = LIST_FIRST(&basetable->gpt_gp->consumer)->provider;
 810         last = pp->mediasize / pp->sectorsize - 1;
 811         tblsz = (table->hdr->hdr_entries * table->hdr->hdr_entsz +
 812             pp->sectorsize - 1) / pp->sectorsize;
 813
 814         table->lba[GPT_ELT_PRIHDR] = 1;
 815         table->lba[GPT_ELT_PRITBL] = 2;
 816         table->lba[GPT_ELT_SECHDR] = last;
 817         table->lba[GPT_ELT_SECTBL] = last - tblsz;
 818         table->state[GPT_ELT_PRIHDR] = GPT_STATE_OK;
 819         table->state[GPT_ELT_PRITBL] = GPT_STATE_OK;
 820         table->state[GPT_ELT_SECHDR] = GPT_STATE_OK;
 821         table->state[GPT_ELT_SECTBL] = GPT_STATE_OK;
 822         table->hdr->hdr_lba_start = 2 + tblsz;
 823         table->hdr->hdr_lba_end = last - tblsz - 1;
 824
 825         basetable->gpt_first = table->hdr->hdr_lba_start;
 826         basetable->gpt_last = table->hdr->hdr_lba_end;
 827         basetable->gpt_corrupt = 0;
 828
 829         return (0);
 830 }
 831
 832 static int
 833 g_part_gpt_setunset(struct g_part_table *table, struct g_part_entry *baseentry,
 834     const char *attrib, unsigned int set)
 835 {
 836         struct g_part_entry *iter;
 837         struct g_part_gpt_entry *entry;
 838         int changed, bootme, bootonce, bootfailed;
 839
 840         bootme = bootonce = bootfailed = 0;
 841         if (strcasecmp(attrib, "bootme") == 0) {
 842                 bootme = 1;
 843         } else if (strcasecmp(attrib, "bootonce") == 0) {
 844                 /* BOOTME is set automatically with BOOTONCE, but not unset. */
 845                 bootonce = 1;
 846                 if (set)
 847                         bootme = 1;
 848         } else if (strcasecmp(attrib, "bootfailed") == 0) {
 849                 /*
 850                  * It should only be possible to unset BOOTFAILED, but it might
 851                  * be useful for test purposes to also be able to set it.
 852                  */
 853                 bootfailed = 1;
 854         }
 855         if (!bootme && !bootonce && !bootfailed)
 856                 return (EINVAL);
 857
 858         LIST_FOREACH(iter, &table->gpt_entry, gpe_entry) {
 859                 if (iter->gpe_deleted)
 860                         continue;
 861                 if (iter != baseentry)
 862                         continue;
 863                 changed = 0;
 864                 entry = (struct g_part_gpt_entry *)iter;
 865                 if (set) {
 866                         if (bootme &&
 867                             !(entry->ent.ent_attr & GPT_ENT_ATTR_BOOTME)) {
 868                                 entry->ent.ent_attr |= GPT_ENT_ATTR_BOOTME;
 869                                 changed = 1;
 870                         }
 871                         if (bootonce &&
 872                             !(entry->ent.ent_attr & GPT_ENT_ATTR_BOOTONCE)) {
 873                                 entry->ent.ent_attr |= GPT_ENT_ATTR_BOOTONCE;
 874                                 changed = 1;
 875                         }
 876                         if (bootfailed &&
 877                             !(entry->ent.ent_attr & GPT_ENT_ATTR_BOOTFAILED)) {
 878                                 entry->ent.ent_attr |= GPT_ENT_ATTR_BOOTFAILED;
 879                                 changed = 1;
 880                         }
 881                 } else {
 882                         if (bootme &&
 883                             (entry->ent.ent_attr & GPT_ENT_ATTR_BOOTME)) {
 884                                 entry->ent.ent_attr &= ~GPT_ENT_ATTR_BOOTME;
 885                                 changed = 1;
 886                         }
 887                         if (bootonce &&
 888                             (entry->ent.ent_attr & GPT_ENT_ATTR_BOOTONCE)) {
 889                                 entry->ent.ent_attr &= ~GPT_ENT_ATTR_BOOTONCE;
 890                                 changed = 1;
 891                         }
 892                         if (bootfailed &&
 893                             (entry->ent.ent_attr & GPT_ENT_ATTR_BOOTFAILED)) {
 894                                 entry->ent.ent_attr &= ~GPT_ENT_ATTR_BOOTFAILED;
 895                                 changed = 1;
 896                         }
 897                 }
 898                 if (changed && !iter->gpe_created)
 899                         iter->gpe_modified = 1;
 900         }
 901         return (0);
 902 }
 903
 904 static const char *
 905 g_part_gpt_type(struct g_part_table *basetable, struct g_part_entry *baseentry,
 906     char *buf, size_t bufsz)
 907 {
 908         struct g_part_gpt_entry *entry;
 909         struct uuid *type;
 910         struct g_part_uuid_alias *uap;
 911
 912         entry = (struct g_part_gpt_entry *)baseentry;
 913         type = &entry->ent.ent_type;
 914         for (uap = &gpt_uuid_alias_match[0]; uap->uuid; uap++)
 915                 if (EQUUID(type, uap->uuid))
 916                         return (g_part_alias_name(uap->alias));
 917         buf[0] = '!';
 918         snprintf_uuid(buf + 1, bufsz - 1, type);
 919
 920         return (buf);
 921 }
 922
 923 static int
 924 g_part_gpt_write(struct g_part_table *basetable, struct g_consumer *cp)
 925 {
 926         unsigned char *buf, *bp;
 927         struct g_provider *pp;
 928         struct g_part_entry *baseentry;
 929         struct g_part_gpt_entry *entry;
 930         struct g_part_gpt_table *table;
 931         size_t tblsz;
 932         uint32_t crc;
 933         int error, index;
 934
 935         pp = cp->provider;
 936         table = (struct g_part_gpt_table *)basetable;
 937         tblsz = (table->hdr->hdr_entries * table->hdr->hdr_entsz +
 938             pp->sectorsize - 1) / pp->sectorsize;
 939
 940         /* Write the PMBR */
 941         buf = g_malloc(pp->sectorsize, M_WAITOK | M_ZERO);
 942         bcopy(table->mbr, buf, MBRSIZE);
 943         error = g_write_data(cp, 0, buf, pp->sectorsize);
 944         g_free(buf);
 945         if (error)
 946                 return (error);
 947
 948         /* Allocate space for the header and entries. */
 949         buf = g_malloc((tblsz + 1) * pp->sectorsize, M_WAITOK | M_ZERO);
 950
 951         memcpy(buf, table->hdr->hdr_sig, sizeof(table->hdr->hdr_sig));
 952         le32enc(buf + 8, table->hdr->hdr_revision);
 953         le32enc(buf + 12, table->hdr->hdr_size);
 954         le64enc(buf + 40, table->hdr->hdr_lba_start);
 955         le64enc(buf + 48, table->hdr->hdr_lba_end);
 956         le_uuid_enc(buf + 56, &table->hdr->hdr_uuid);
 957         le32enc(buf + 80, table->hdr->hdr_entries);
 958         le32enc(buf + 84, table->hdr->hdr_entsz);
 959
 960         LIST_FOREACH(baseentry, &basetable->gpt_entry, gpe_entry) {
 961                 if (baseentry->gpe_deleted)
 962                         continue;
 963                 entry = (struct g_part_gpt_entry *)baseentry;
 964                 index = baseentry->gpe_index - 1;
 965                 bp = buf + pp->sectorsize + table->hdr->hdr_entsz * index;
 966                 le_uuid_enc(bp, &entry->ent.ent_type);
 967                 le_uuid_enc(bp + 16, &entry->ent.ent_uuid);
 968                 le64enc(bp + 32, entry->ent.ent_lba_start);
 969                 le64enc(bp + 40, entry->ent.ent_lba_end);
 970                 le64enc(bp + 48, entry->ent.ent_attr);
 971                 memcpy(bp + 56, entry->ent.ent_name,
 972                     sizeof(entry->ent.ent_name));
 973         }
 974
 975         crc = crc32(buf + pp->sectorsize,
 976             table->hdr->hdr_entries * table->hdr->hdr_entsz);
 977         le32enc(buf + 88, crc);
 978
 979         /* Write primary meta-data. */
 980         le32enc(buf + 16, 0);   /* hdr_crc_self. */
 981         le64enc(buf + 24, table->lba[GPT_ELT_PRIHDR]);  /* hdr_lba_self. */
 982         le64enc(buf + 32, table->lba[GPT_ELT_SECHDR]);  /* hdr_lba_alt. */
 983         le64enc(buf + 72, table->lba[GPT_ELT_PRITBL]);  /* hdr_lba_table. */
 984         crc = crc32(buf, table->hdr->hdr_size);
 985         le32enc(buf + 16, crc);
 986
 987         error = g_write_data(cp, table->lba[GPT_ELT_PRITBL] * pp->sectorsize,
 988             buf + pp->sectorsize, tblsz * pp->sectorsize);
 989         if (error)
 990                 goto out;
 991         error = g_write_data(cp, table->lba[GPT_ELT_PRIHDR] * pp->sectorsize,
 992             buf, pp->sectorsize);
 993         if (error)
 994                 goto out;
 995
 996         /* Write secondary meta-data. */
 997         le32enc(buf + 16, 0);   /* hdr_crc_self. */
 998         le64enc(buf + 24, table->lba[GPT_ELT_SECHDR]);  /* hdr_lba_self. */
 999         le64enc(buf + 32, table->lba[GPT_ELT_PRIHDR]);  /* hdr_lba_alt. */
1000         le64enc(buf + 72, table->lba[GPT_ELT_SECTBL]);  /* hdr_lba_table. */
1001         crc = crc32(buf, table->hdr->hdr_size);
1002         le32enc(buf + 16, crc);
1003
1004         error = g_write_data(cp, table->lba[GPT_ELT_SECTBL] * pp->sectorsize,
1005             buf + pp->sectorsize, tblsz * pp->sectorsize);
1006         if (error)
1007                 goto out;
1008         error = g_write_data(cp, table->lba[GPT_ELT_SECHDR] * pp->sectorsize,
1009             buf, pp->sectorsize);
1010
1011  out:
1012         g_free(buf);
1013         return (error);
1014 }
1015
1016 static void
1017 g_gpt_printf_utf16(struct sbuf *sb, uint16_t *str, size_t len)
1018 {
1019         u_int bo;
1020         uint32_t ch;
1021         uint16_t c;
1022
1023         bo = LITTLE_ENDIAN;     /* GPT is little-endian */
1024         while (len > 0 && *str != 0) {
1025                 ch = (bo == BIG_ENDIAN) ? be16toh(*str) : le16toh(*str);
1026                 str++, len--;
1027                 if ((ch & 0xf800) == 0xd800) {
1028                         if (len > 0) {
1029                                 c = (bo == BIG_ENDIAN) ? be16toh(*str)
1030                                     : le16toh(*str);
1031                                 str++, len--;
1032                         } else
1033                                 c = 0xfffd;
1034                         if ((ch & 0x400) == 0 && (c & 0xfc00) == 0xdc00) {
1035                                 ch = ((ch & 0x3ff) << 10) + (c & 0x3ff);
1036                                 ch += 0x10000;
1037                         } else
1038                                 ch = 0xfffd;
1039                 } else if (ch == 0xfffe) { /* BOM (U+FEFF) swapped. */
1040                         bo = (bo == BIG_ENDIAN) ? LITTLE_ENDIAN : BIG_ENDIAN;
1041                         continue;
1042                 } else if (ch == 0xfeff) /* BOM (U+FEFF) unswapped. */
1043                         continue;
1044
1045                 /* Write the Unicode character in UTF-8 */
1046                 if (ch < 0x80)
1047                         sbuf_printf(sb, "%c", ch);
1048                 else if (ch < 0x800)
1049                         sbuf_printf(sb, "%c%c", 0xc0 | (ch >> 6),
1050                             0x80 | (ch & 0x3f));
1051                 else if (ch < 0x10000)
1052                         sbuf_printf(sb, "%c%c%c", 0xe0 | (ch >> 12),
1053                             0x80 | ((ch >> 6) & 0x3f), 0x80 | (ch & 0x3f));
1054                 else if (ch < 0x200000)
1055                         sbuf_printf(sb, "%c%c%c%c", 0xf0 | (ch >> 18),
1056                             0x80 | ((ch >> 12) & 0x3f),
1057                             0x80 | ((ch >> 6) & 0x3f), 0x80 | (ch & 0x3f));
1058         }
1059 }
1060
1061 static void
1062 g_gpt_utf8_to_utf16(const uint8_t *s8, uint16_t *s16, size_t s16len)
1063 {
1064         size_t s16idx, s8idx;
1065         uint32_t utfchar;
1066         unsigned int c, utfbytes;
1067
1068         s8idx = s16idx = 0;
1069         utfchar = 0;
1070         utfbytes = 0;
1071         bzero(s16, s16len << 1);
1072         while (s8[s8idx] != 0 && s16idx < s16len) {
1073                 c = s8[s8idx++];
1074                 if ((c & 0xc0) != 0x80) {
1075                         /* Initial characters. */
1076                         if (utfbytes != 0) {
1077                                 /* Incomplete encoding of previous char. */
1078                                 s16[s16idx++] = htole16(0xfffd);
1079                         }
1080                         if ((c & 0xf8) == 0xf0) {
1081                                 utfchar = c & 0x07;
1082                                 utfbytes = 3;
1083                         } else if ((c & 0xf0) == 0xe0) {
1084                                 utfchar = c & 0x0f;
1085                                 utfbytes = 2;
1086                         } else if ((c & 0xe0) == 0xc0) {
1087                                 utfchar = c & 0x1f;
1088                                 utfbytes = 1;
1089                         } else {
1090                                 utfchar = c & 0x7f;
1091                                 utfbytes = 0;
1092                         }
1093                 } else {
1094                         /* Followup characters. */
1095                         if (utfbytes > 0) {
1096                                 utfchar = (utfchar << 6) + (c & 0x3f);
1097                                 utfbytes--;
1098                         } else if (utfbytes == 0)
1099                                 utfbytes = ~0;
1100                 }
1101                 /*
1102                  * Write the complete Unicode character as UTF-16 when we
1103                  * have all the UTF-8 charactars collected.
1104                  */
1105                 if (utfbytes == 0) {
1106                         /*
1107                          * If we need to write 2 UTF-16 characters, but
1108                          * we only have room for 1, then we truncate the
1109                          * string by writing a 0 instead.
1110                          */
1111                         if (utfchar >= 0x10000 && s16idx < s16len - 1) {
1112                                 s16[s16idx++] =
1113                                     htole16(0xd800 | ((utfchar >> 10) - 0x40));
1114                                 s16[s16idx++] =
1115                                     htole16(0xdc00 | (utfchar & 0x3ff));
1116                         } else
1117                                 s16[s16idx++] = (utfchar >= 0x10000) ? 0 :
1118                                     htole16(utfchar);
1119                 }
1120         }
1121         /*
1122          * If our input string was truncated, append an invalid encoding
1123          * character to the output string.
1124          */
1125         if (utfbytes != 0 && s16idx < s16len)
1126                 s16[s16idx++] = htole16(0xfffd);
1127 }