g_part_ebr.c revision 251588
1257752Semaste/*- 2257752Semaste * Copyright (c) 2007-2009 Marcel Moolenaar 3257752Semaste * All rights reserved. 4257752Semaste * 5257752Semaste * Redistribution and use in source and binary forms, with or without 6257752Semaste * modification, are permitted provided that the following conditions 7257752Semaste * are met: 8257752Semaste * 9257752Semaste * 1. Redistributions of source code must retain the above copyright 10257752Semaste * notice, this list of conditions and the following disclaimer. 11257752Semaste * 2. Redistributions in binary form must reproduce the above copyright 12257752Semaste * notice, this list of conditions and the following disclaimer in the 13257752Semaste * documentation and/or other materials provided with the distribution. 14257752Semaste * 15257752Semaste * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16257752Semaste * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17257752Semaste * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18257752Semaste * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19257752Semaste * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20257752Semaste * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21257752Semaste * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22257752Semaste * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23257752Semaste * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24257752Semaste * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25257752Semaste */ 26257752Semaste 27257752Semaste#include "opt_geom.h" 28257752Semaste 29257752Semaste#include <sys/cdefs.h> 30257752Semaste__FBSDID("$FreeBSD: head/sys/geom/part/g_part_ebr.c 251588 2013-06-09 23:34:26Z marcel $"); 31257752Semaste 32257752Semaste#include <sys/param.h> 33257752Semaste#include <sys/bio.h> 34257752Semaste#include <sys/diskmbr.h> 35257752Semaste#include <sys/endian.h> 36257752Semaste#include <sys/kernel.h> 37257752Semaste#include <sys/kobj.h> 38257752Semaste#include <sys/limits.h> 39257752Semaste#include <sys/lock.h> 40257752Semaste#include <sys/malloc.h> 41257752Semaste#include <sys/mutex.h> 42257752Semaste#include <sys/queue.h> 43257752Semaste#include <sys/sbuf.h> 44257752Semaste#include <sys/systm.h> 45257752Semaste#include <sys/sysctl.h> 46257752Semaste#include <geom/geom.h> 47257752Semaste#include <geom/part/g_part.h> 48257752Semaste 49257752Semaste#include "g_part_if.h" 50257752Semaste 51257752SemasteFEATURE(geom_part_ebr, 52257752Semaste "GEOM partitioning class for extended boot records support"); 53257752Semaste#if defined(GEOM_PART_EBR_COMPAT) 54257752SemasteFEATURE(geom_part_ebr_compat, 55257752Semaste "GEOM EBR partitioning class: backward-compatible partition names"); 56257752Semaste#endif 57257752Semaste 58257752Semaste#define EBRSIZE 512 59257752Semaste 60257752Semastestruct g_part_ebr_table { 61257752Semaste struct g_part_table base; 62257752Semaste#ifndef GEOM_PART_EBR_COMPAT 63257752Semaste u_char ebr[EBRSIZE]; 64257752Semaste#endif 65257752Semaste}; 66257752Semaste 67257752Semastestruct g_part_ebr_entry { 68257752Semaste struct g_part_entry base; 69257752Semaste struct dos_partition ent; 70257752Semaste}; 71257752Semaste 72257752Semastestatic int g_part_ebr_add(struct g_part_table *, struct g_part_entry *, 73257752Semaste struct g_part_parms *); 74257752Semastestatic int g_part_ebr_create(struct g_part_table *, struct g_part_parms *); 75257752Semastestatic int g_part_ebr_destroy(struct g_part_table *, struct g_part_parms *); 76257752Semastestatic void g_part_ebr_dumpconf(struct g_part_table *, struct g_part_entry *, 77257752Semaste struct sbuf *, const char *); 78257752Semastestatic int g_part_ebr_dumpto(struct g_part_table *, struct g_part_entry *); 79257752Semaste#if defined(GEOM_PART_EBR_COMPAT) 80257752Semastestatic void g_part_ebr_fullname(struct g_part_table *, struct g_part_entry *, 81257752Semaste struct sbuf *, const char *); 82257752Semaste#endif 83257752Semastestatic int g_part_ebr_modify(struct g_part_table *, struct g_part_entry *, 84257752Semaste struct g_part_parms *); 85257752Semastestatic const char *g_part_ebr_name(struct g_part_table *, struct g_part_entry *, 86257752Semaste char *, size_t); 87257752Semastestatic int g_part_ebr_precheck(struct g_part_table *, enum g_part_ctl, 88257752Semaste struct g_part_parms *); 89257752Semastestatic int g_part_ebr_probe(struct g_part_table *, struct g_consumer *); 90257752Semastestatic int g_part_ebr_read(struct g_part_table *, struct g_consumer *); 91257752Semastestatic int g_part_ebr_setunset(struct g_part_table *, struct g_part_entry *, 92257752Semaste const char *, unsigned int); 93257752Semastestatic const char *g_part_ebr_type(struct g_part_table *, struct g_part_entry *, 94257752Semaste char *, size_t); 95257752Semastestatic int g_part_ebr_write(struct g_part_table *, struct g_consumer *); 96257752Semaste 97257752Semastestatic kobj_method_t g_part_ebr_methods[] = { 98257752Semaste KOBJMETHOD(g_part_add, g_part_ebr_add), 99257752Semaste KOBJMETHOD(g_part_create, g_part_ebr_create), 100257752Semaste KOBJMETHOD(g_part_destroy, g_part_ebr_destroy), 101257752Semaste KOBJMETHOD(g_part_dumpconf, g_part_ebr_dumpconf), 102257752Semaste KOBJMETHOD(g_part_dumpto, g_part_ebr_dumpto), 103257752Semaste#if defined(GEOM_PART_EBR_COMPAT) 104257752Semaste KOBJMETHOD(g_part_fullname, g_part_ebr_fullname), 105257752Semaste#endif 106257752Semaste KOBJMETHOD(g_part_modify, g_part_ebr_modify), 107257752Semaste KOBJMETHOD(g_part_name, g_part_ebr_name), 108257752Semaste KOBJMETHOD(g_part_precheck, g_part_ebr_precheck), 109257752Semaste KOBJMETHOD(g_part_probe, g_part_ebr_probe), 110257752Semaste KOBJMETHOD(g_part_read, g_part_ebr_read), 111257752Semaste KOBJMETHOD(g_part_setunset, g_part_ebr_setunset), 112257752Semaste KOBJMETHOD(g_part_type, g_part_ebr_type), 113257752Semaste KOBJMETHOD(g_part_write, g_part_ebr_write), 114257752Semaste { 0, 0 } 115257752Semaste}; 116257752Semaste 117257752Semastestatic struct g_part_scheme g_part_ebr_scheme = { 118257752Semaste "EBR", 119257752Semaste g_part_ebr_methods, 120257752Semaste sizeof(struct g_part_ebr_table), 121257752Semaste .gps_entrysz = sizeof(struct g_part_ebr_entry), 122257752Semaste .gps_minent = 1, 123257752Semaste .gps_maxent = INT_MAX, 124257752Semaste}; 125257752SemasteG_PART_SCHEME_DECLARE(g_part_ebr); 126257752Semaste 127257752Semastestatic struct g_part_ebr_alias { 128257752Semaste u_char typ; 129257752Semaste int alias; 130257752Semaste} ebr_alias_match[] = { 131257752Semaste { DOSPTYP_386BSD, G_PART_ALIAS_FREEBSD }, 132257752Semaste { DOSPTYP_NTFS, G_PART_ALIAS_MS_NTFS }, 133257752Semaste { DOSPTYP_FAT32, G_PART_ALIAS_MS_FAT32 }, 134257752Semaste { DOSPTYP_LINSWP, G_PART_ALIAS_LINUX_SWAP }, 135257752Semaste { DOSPTYP_LINUX, G_PART_ALIAS_LINUX_DATA }, 136257752Semaste { DOSPTYP_LINLVM, G_PART_ALIAS_LINUX_LVM }, 137257752Semaste { DOSPTYP_LINRAID, G_PART_ALIAS_LINUX_RAID }, 138257752Semaste}; 139257752Semaste 140257752Semastestatic void ebr_set_chs(struct g_part_table *, uint32_t, u_char *, u_char *, 141257752Semaste u_char *); 142257752Semaste 143257752Semastestatic void 144257752Semasteebr_entry_decode(const char *p, struct dos_partition *ent) 145257752Semaste{ 146257752Semaste ent->dp_flag = p[0]; 147257752Semaste ent->dp_shd = p[1]; 148257752Semaste ent->dp_ssect = p[2]; 149257752Semaste ent->dp_scyl = p[3]; 150257752Semaste ent->dp_typ = p[4]; 151257752Semaste ent->dp_ehd = p[5]; 152257752Semaste ent->dp_esect = p[6]; 153257752Semaste ent->dp_ecyl = p[7]; 154257752Semaste ent->dp_start = le32dec(p + 8); 155257752Semaste ent->dp_size = le32dec(p + 12); 156257752Semaste} 157257752Semaste 158257752Semastestatic void 159257752Semasteebr_entry_link(struct g_part_table *table, uint32_t start, uint32_t end, 160257752Semaste u_char *buf) 161257752Semaste{ 162257752Semaste 163257752Semaste buf[0] = 0 /* dp_flag */; 164257752Semaste ebr_set_chs(table, start, &buf[3] /* dp_scyl */, &buf[1] /* dp_shd */, 165257752Semaste &buf[2] /* dp_ssect */); 166257752Semaste buf[4] = 5 /* dp_typ */; 167257752Semaste ebr_set_chs(table, end, &buf[7] /* dp_ecyl */, &buf[5] /* dp_ehd */, 168257752Semaste &buf[6] /* dp_esect */); 169257752Semaste le32enc(buf + 8, start); 170257752Semaste le32enc(buf + 12, end - start + 1); 171257752Semaste} 172257752Semaste 173257752Semastestatic int 174257752Semasteebr_parse_type(const char *type, u_char *dp_typ) 175257752Semaste{ 176257752Semaste const char *alias; 177257752Semaste char *endp; 178257752Semaste long lt; 179257752Semaste int i; 180257752Semaste 181257752Semaste if (type[0] == '!') { 182257752Semaste lt = strtol(type + 1, &endp, 0); 183257752Semaste if (type[1] == '\0' || *endp != '\0' || lt <= 0 || lt >= 256) 184257752Semaste return (EINVAL); 185257752Semaste *dp_typ = (u_char)lt; 186257752Semaste return (0); 187257752Semaste } 188257752Semaste for (i = 0; 189257752Semaste i < sizeof(ebr_alias_match) / sizeof(ebr_alias_match[0]); i++) { 190257752Semaste alias = g_part_alias_name(ebr_alias_match[i].alias); 191257752Semaste if (strcasecmp(type, alias) == 0) { 192257752Semaste *dp_typ = ebr_alias_match[i].typ; 193257752Semaste return (0); 194257752Semaste } 195257752Semaste } 196257752Semaste return (EINVAL); 197257752Semaste} 198257752Semaste 199257752Semaste 200257752Semastestatic void 201257752Semasteebr_set_chs(struct g_part_table *table, uint32_t lba, u_char *cylp, u_char *hdp, 202257752Semaste u_char *secp) 203257752Semaste{ 204257752Semaste uint32_t cyl, hd, sec; 205257752Semaste 206257752Semaste sec = lba % table->gpt_sectors + 1; 207257752Semaste lba /= table->gpt_sectors; 208257752Semaste hd = lba % table->gpt_heads; 209257752Semaste lba /= table->gpt_heads; 210257752Semaste cyl = lba; 211257752Semaste if (cyl > 1023) 212257752Semaste sec = hd = cyl = ~0; 213257752Semaste 214257752Semaste *cylp = cyl & 0xff; 215257752Semaste *hdp = hd & 0xff; 216257752Semaste *secp = (sec & 0x3f) | ((cyl >> 2) & 0xc0); 217257752Semaste} 218257752Semaste 219257752Semastestatic int 220257752Semasteg_part_ebr_add(struct g_part_table *basetable, struct g_part_entry *baseentry, 221257752Semaste struct g_part_parms *gpp) 222257752Semaste{ 223257752Semaste struct g_geom *gp; 224257752Semaste struct g_provider *pp; 225257752Semaste struct g_part_ebr_entry *entry; 226257752Semaste uint32_t start, size, sectors; 227257752Semaste 228257752Semaste if (gpp->gpp_parms & G_PART_PARM_LABEL) 229257752Semaste return (EINVAL); 230257752Semaste 231257752Semaste gp = basetable->gpt_gp; 232257752Semaste pp = LIST_FIRST(&gp->consumer)->provider; 233257752Semaste sectors = basetable->gpt_sectors; 234257752Semaste 235257752Semaste entry = (struct g_part_ebr_entry *)baseentry; 236257752Semaste 237257752Semaste start = gpp->gpp_start; 238257752Semaste size = gpp->gpp_size; 239257752Semaste if (size < 2 * sectors) 240257752Semaste return (EINVAL); 241257752Semaste if (start % sectors) { 242257752Semaste size = size - sectors + (start % sectors); 243257752Semaste start = start - (start % sectors) + sectors; 244257752Semaste } 245257752Semaste if (size % sectors) 246257752Semaste size = size - (size % sectors); 247257752Semaste if (size < 2 * sectors) 248257752Semaste return (EINVAL); 249257752Semaste 250257752Semaste if (baseentry->gpe_deleted) 251257752Semaste bzero(&entry->ent, sizeof(entry->ent)); 252257752Semaste 253257752Semaste KASSERT(baseentry->gpe_start <= start, ("%s", __func__)); 254257752Semaste KASSERT(baseentry->gpe_end >= start + size - 1, ("%s", __func__)); 255257752Semaste baseentry->gpe_index = (start / sectors) + 1; 256257752Semaste baseentry->gpe_offset = (off_t)(start + sectors) * pp->sectorsize; 257257752Semaste baseentry->gpe_start = start; 258257752Semaste baseentry->gpe_end = start + size - 1; 259257752Semaste entry->ent.dp_start = sectors; 260257752Semaste entry->ent.dp_size = size - sectors; 261257752Semaste ebr_set_chs(basetable, entry->ent.dp_start, &entry->ent.dp_scyl, 262257752Semaste &entry->ent.dp_shd, &entry->ent.dp_ssect); 263257752Semaste ebr_set_chs(basetable, baseentry->gpe_end, &entry->ent.dp_ecyl, 264257752Semaste &entry->ent.dp_ehd, &entry->ent.dp_esect); 265257752Semaste return (ebr_parse_type(gpp->gpp_type, &entry->ent.dp_typ)); 266257752Semaste} 267257752Semaste 268257752Semastestatic int 269257752Semasteg_part_ebr_create(struct g_part_table *basetable, struct g_part_parms *gpp) 270257752Semaste{ 271257752Semaste char type[64]; 272257752Semaste struct g_consumer *cp; 273257752Semaste struct g_provider *pp; 274257752Semaste uint32_t msize; 275257752Semaste int error; 276257752Semaste 277257752Semaste pp = gpp->gpp_provider; 278257752Semaste 279257752Semaste if (pp->sectorsize < EBRSIZE) 280257752Semaste return (ENOSPC); 281257752Semaste if (pp->sectorsize > 4096) 282257752Semaste return (ENXIO); 283257752Semaste 284257752Semaste /* Check that we have a parent and that it's a MBR. */ 285257752Semaste if (basetable->gpt_depth == 0) 286257752Semaste return (ENXIO); 287257752Semaste cp = LIST_FIRST(&pp->consumers); 288257752Semaste error = g_getattr("PART::scheme", cp, &type); 289257752Semaste if (error != 0) 290257752Semaste return (error); 291257752Semaste if (strcmp(type, "MBR") != 0) 292257752Semaste return (ENXIO); 293257752Semaste error = g_getattr("PART::type", cp, &type); 294257752Semaste if (error != 0) 295257752Semaste return (error); 296257752Semaste if (strcmp(type, "ebr") != 0) 297257752Semaste return (ENXIO); 298257752Semaste 299257752Semaste msize = MIN(pp->mediasize / pp->sectorsize, UINT32_MAX); 300257752Semaste basetable->gpt_first = 0; 301257752Semaste basetable->gpt_last = msize - 1; 302257752Semaste basetable->gpt_entries = msize / basetable->gpt_sectors; 303257752Semaste return (0); 304257752Semaste} 305257752Semaste 306257752Semastestatic int 307257752Semasteg_part_ebr_destroy(struct g_part_table *basetable, struct g_part_parms *gpp) 308257752Semaste{ 309257752Semaste 310257752Semaste /* Wipe the first sector to clear the partitioning. */ 311257752Semaste basetable->gpt_smhead |= 1; 312257752Semaste return (0); 313257752Semaste} 314257752Semaste 315257752Semastestatic void 316257752Semasteg_part_ebr_dumpconf(struct g_part_table *table, struct g_part_entry *baseentry, 317257752Semaste struct sbuf *sb, const char *indent) 318257752Semaste{ 319257752Semaste struct g_part_ebr_entry *entry; 320257752Semaste 321257752Semaste entry = (struct g_part_ebr_entry *)baseentry; 322257752Semaste if (indent == NULL) { 323257752Semaste /* conftxt: libdisk compatibility */ 324257752Semaste sbuf_printf(sb, " xs MBREXT xt %u", entry->ent.dp_typ); 325257752Semaste } else if (entry != NULL) { 326257752Semaste /* confxml: partition entry information */ 327257752Semaste sbuf_printf(sb, "%s<rawtype>%u</rawtype>\n", indent, 328257752Semaste entry->ent.dp_typ); 329257752Semaste if (entry->ent.dp_flag & 0x80) 330257752Semaste sbuf_printf(sb, "%s<attrib>active</attrib>\n", indent); 331257752Semaste } else { 332257752Semaste /* confxml: scheme information */ 333257752Semaste } 334257752Semaste} 335257752Semaste 336257752Semastestatic int 337257752Semasteg_part_ebr_dumpto(struct g_part_table *table, struct g_part_entry *baseentry) 338257752Semaste{ 339257752Semaste struct g_part_ebr_entry *entry; 340257752Semaste 341257752Semaste /* Allow dumping to a FreeBSD partition or Linux swap partition only. */ 342257752Semaste entry = (struct g_part_ebr_entry *)baseentry; 343257752Semaste return ((entry->ent.dp_typ == DOSPTYP_386BSD || 344257752Semaste entry->ent.dp_typ == DOSPTYP_LINSWP) ? 1 : 0); 345257752Semaste} 346257752Semaste 347257752Semaste#if defined(GEOM_PART_EBR_COMPAT) 348257752Semastestatic void 349257752Semasteg_part_ebr_fullname(struct g_part_table *table, struct g_part_entry *entry, 350257752Semaste struct sbuf *sb, const char *pfx) 351257752Semaste{ 352257752Semaste struct g_part_entry *iter; 353257752Semaste u_int idx; 354257752Semaste 355257752Semaste idx = 5; 356257752Semaste LIST_FOREACH(iter, &table->gpt_entry, gpe_entry) { 357257752Semaste if (iter == entry) 358257752Semaste break; 359257752Semaste idx++; 360257752Semaste } 361257752Semaste sbuf_printf(sb, "%.*s%u", (int)strlen(pfx) - 1, pfx, idx); 362257752Semaste} 363257752Semaste#endif 364257752Semaste 365257752Semastestatic int 366269024Semasteg_part_ebr_modify(struct g_part_table *basetable, 367269024Semaste struct g_part_entry *baseentry, struct g_part_parms *gpp) 368269024Semaste{ 369257752Semaste struct g_part_ebr_entry *entry; 370257752Semaste 371257752Semaste if (gpp->gpp_parms & G_PART_PARM_LABEL) 372257752Semaste return (EINVAL); 373257752Semaste 374257752Semaste entry = (struct g_part_ebr_entry *)baseentry; 375257752Semaste if (gpp->gpp_parms & G_PART_PARM_TYPE) 376257752Semaste return (ebr_parse_type(gpp->gpp_type, &entry->ent.dp_typ)); 377257752Semaste return (0); 378257752Semaste} 379257752Semaste 380257752Semastestatic const char * 381257752Semasteg_part_ebr_name(struct g_part_table *table, struct g_part_entry *entry, 382257752Semaste char *buf, size_t bufsz) 383257752Semaste{ 384257752Semaste 385257752Semaste snprintf(buf, bufsz, "+%08u", entry->gpe_index); 386257752Semaste return (buf); 387257752Semaste} 388257752Semaste 389269024Semastestatic int 390269024Semasteg_part_ebr_precheck(struct g_part_table *table, enum g_part_ctl req, 391257752Semaste struct g_part_parms *gpp) 392257752Semaste{ 393257752Semaste#if defined(GEOM_PART_EBR_COMPAT) 394257752Semaste if (req == G_PART_CTL_DESTROY) 395257752Semaste return (0); 396257752Semaste return (ECANCELED); 397#else 398 /* 399 * The index is a function of the start of the partition. 400 * This is not something the user can override, nor is it 401 * something the common code will do right. We can set the 402 * index now so that we get what we need. 403 */ 404 if (req == G_PART_CTL_ADD) 405 gpp->gpp_index = (gpp->gpp_start / table->gpt_sectors) + 1; 406 return (0); 407#endif 408} 409 410static int 411g_part_ebr_probe(struct g_part_table *table, struct g_consumer *cp) 412{ 413 char type[64]; 414 struct g_provider *pp; 415 u_char *buf, *p; 416 int error, index, res; 417 uint16_t magic; 418 419 pp = cp->provider; 420 421 /* Sanity-check the provider. */ 422 if (pp->sectorsize < EBRSIZE || pp->mediasize < pp->sectorsize) 423 return (ENOSPC); 424 if (pp->sectorsize > 4096) 425 return (ENXIO); 426 427 /* Check that we have a parent and that it's a MBR. */ 428 if (table->gpt_depth == 0) 429 return (ENXIO); 430 error = g_getattr("PART::scheme", cp, &type); 431 if (error != 0) 432 return (error); 433 if (strcmp(type, "MBR") != 0) 434 return (ENXIO); 435 /* Check that partition has type DOSPTYP_EBR. */ 436 error = g_getattr("PART::type", cp, &type); 437 if (error != 0) 438 return (error); 439 if (strcmp(type, "ebr") != 0) 440 return (ENXIO); 441 442 /* Check that there's a EBR. */ 443 buf = g_read_data(cp, 0L, pp->sectorsize, &error); 444 if (buf == NULL) 445 return (error); 446 447 /* We goto out on mismatch. */ 448 res = ENXIO; 449 450 magic = le16dec(buf + DOSMAGICOFFSET); 451 if (magic != DOSMAGIC) 452 goto out; 453 454 for (index = 0; index < 2; index++) { 455 p = buf + DOSPARTOFF + index * DOSPARTSIZE; 456 if (p[0] != 0 && p[0] != 0x80) 457 goto out; 458 } 459 res = G_PART_PROBE_PRI_NORM; 460 461 out: 462 g_free(buf); 463 return (res); 464} 465 466static int 467g_part_ebr_read(struct g_part_table *basetable, struct g_consumer *cp) 468{ 469 struct dos_partition ent[2]; 470 struct g_provider *pp; 471 struct g_part_entry *baseentry; 472 struct g_part_ebr_table *table; 473 struct g_part_ebr_entry *entry; 474 u_char *buf; 475 off_t ofs, msize; 476 u_int lba; 477 int error, index; 478 479 pp = cp->provider; 480 table = (struct g_part_ebr_table *)basetable; 481 msize = MIN(pp->mediasize / pp->sectorsize, UINT32_MAX); 482 483 lba = 0; 484 while (1) { 485 ofs = (off_t)lba * pp->sectorsize; 486 buf = g_read_data(cp, ofs, pp->sectorsize, &error); 487 if (buf == NULL) 488 return (error); 489 490 ebr_entry_decode(buf + DOSPARTOFF + 0 * DOSPARTSIZE, ent + 0); 491 ebr_entry_decode(buf + DOSPARTOFF + 1 * DOSPARTSIZE, ent + 1); 492 493 /* The 3rd & 4th entries should be zeroes. */ 494 if (le64dec(buf + DOSPARTOFF + 2 * DOSPARTSIZE) + 495 le64dec(buf + DOSPARTOFF + 3 * DOSPARTSIZE) != 0) { 496 basetable->gpt_corrupt = 1; 497 printf("GEOM: %s: invalid entries in the EBR ignored.\n", 498 pp->name); 499 } 500#ifndef GEOM_PART_EBR_COMPAT 501 /* Save the first EBR, it can contain a boot code */ 502 if (lba == 0) 503 bcopy(buf, table->ebr, sizeof(table->ebr)); 504#endif 505 g_free(buf); 506 507 if (ent[0].dp_typ == 0) 508 break; 509 510 if (ent[0].dp_typ == 5 && ent[1].dp_typ == 0) { 511 lba = ent[0].dp_start; 512 continue; 513 } 514 515 index = (lba / basetable->gpt_sectors) + 1; 516 baseentry = (struct g_part_entry *)g_part_new_entry(basetable, 517 index, lba, lba + ent[0].dp_start + ent[0].dp_size - 1); 518 baseentry->gpe_offset = (off_t)(lba + ent[0].dp_start) * 519 pp->sectorsize; 520 entry = (struct g_part_ebr_entry *)baseentry; 521 entry->ent = ent[0]; 522 523 if (ent[1].dp_typ == 0) 524 break; 525 526 lba = ent[1].dp_start; 527 } 528 529 basetable->gpt_entries = msize / basetable->gpt_sectors; 530 basetable->gpt_first = 0; 531 basetable->gpt_last = msize - 1; 532 return (0); 533} 534 535static int 536g_part_ebr_setunset(struct g_part_table *table, struct g_part_entry *baseentry, 537 const char *attrib, unsigned int set) 538{ 539 struct g_part_entry *iter; 540 struct g_part_ebr_entry *entry; 541 int changed; 542 543 if (baseentry == NULL) 544 return (ENODEV); 545 if (strcasecmp(attrib, "active") != 0) 546 return (EINVAL); 547 548 /* Only one entry can have the active attribute. */ 549 LIST_FOREACH(iter, &table->gpt_entry, gpe_entry) { 550 if (iter->gpe_deleted) 551 continue; 552 changed = 0; 553 entry = (struct g_part_ebr_entry *)iter; 554 if (iter == baseentry) { 555 if (set && (entry->ent.dp_flag & 0x80) == 0) { 556 entry->ent.dp_flag |= 0x80; 557 changed = 1; 558 } else if (!set && (entry->ent.dp_flag & 0x80)) { 559 entry->ent.dp_flag &= ~0x80; 560 changed = 1; 561 } 562 } else { 563 if (set && (entry->ent.dp_flag & 0x80)) { 564 entry->ent.dp_flag &= ~0x80; 565 changed = 1; 566 } 567 } 568 if (changed && !iter->gpe_created) 569 iter->gpe_modified = 1; 570 } 571 return (0); 572} 573 574static const char * 575g_part_ebr_type(struct g_part_table *basetable, struct g_part_entry *baseentry, 576 char *buf, size_t bufsz) 577{ 578 struct g_part_ebr_entry *entry; 579 int i; 580 581 entry = (struct g_part_ebr_entry *)baseentry; 582 for (i = 0; 583 i < sizeof(ebr_alias_match) / sizeof(ebr_alias_match[0]); i++) { 584 if (ebr_alias_match[i].typ == entry->ent.dp_typ) 585 return (g_part_alias_name(ebr_alias_match[i].alias)); 586 } 587 snprintf(buf, bufsz, "!%d", entry->ent.dp_typ); 588 return (buf); 589} 590 591static int 592g_part_ebr_write(struct g_part_table *basetable, struct g_consumer *cp) 593{ 594#ifndef GEOM_PART_EBR_COMPAT 595 struct g_part_ebr_table *table; 596#endif 597 struct g_provider *pp; 598 struct g_part_entry *baseentry, *next; 599 struct g_part_ebr_entry *entry; 600 u_char *buf; 601 u_char *p; 602 int error; 603 604 pp = cp->provider; 605 buf = g_malloc(pp->sectorsize, M_WAITOK | M_ZERO); 606#ifndef GEOM_PART_EBR_COMPAT 607 table = (struct g_part_ebr_table *)basetable; 608 bcopy(table->ebr, buf, DOSPARTOFF); 609#endif 610 le16enc(buf + DOSMAGICOFFSET, DOSMAGIC); 611 612 baseentry = LIST_FIRST(&basetable->gpt_entry); 613 while (baseentry != NULL && baseentry->gpe_deleted) 614 baseentry = LIST_NEXT(baseentry, gpe_entry); 615 616 /* Wipe-out the first EBR when there are no slices. */ 617 if (baseentry == NULL) { 618 error = g_write_data(cp, 0, buf, pp->sectorsize); 619 goto out; 620 } 621 622 /* 623 * If the first partition is not in LBA 0, we need to 624 * put a "link" EBR in LBA 0. 625 */ 626 if (baseentry->gpe_start != 0) { 627 ebr_entry_link(basetable, (uint32_t)baseentry->gpe_start, 628 (uint32_t)baseentry->gpe_end, buf + DOSPARTOFF); 629 error = g_write_data(cp, 0, buf, pp->sectorsize); 630 if (error) 631 goto out; 632 } 633 634 do { 635 entry = (struct g_part_ebr_entry *)baseentry; 636 637 p = buf + DOSPARTOFF; 638 p[0] = entry->ent.dp_flag; 639 p[1] = entry->ent.dp_shd; 640 p[2] = entry->ent.dp_ssect; 641 p[3] = entry->ent.dp_scyl; 642 p[4] = entry->ent.dp_typ; 643 p[5] = entry->ent.dp_ehd; 644 p[6] = entry->ent.dp_esect; 645 p[7] = entry->ent.dp_ecyl; 646 le32enc(p + 8, entry->ent.dp_start); 647 le32enc(p + 12, entry->ent.dp_size); 648 649 next = LIST_NEXT(baseentry, gpe_entry); 650 while (next != NULL && next->gpe_deleted) 651 next = LIST_NEXT(next, gpe_entry); 652 653 p += DOSPARTSIZE; 654 if (next != NULL) 655 ebr_entry_link(basetable, (uint32_t)next->gpe_start, 656 (uint32_t)next->gpe_end, p); 657 else 658 bzero(p, DOSPARTSIZE); 659 660 error = g_write_data(cp, baseentry->gpe_start * pp->sectorsize, 661 buf, pp->sectorsize); 662#ifndef GEOM_PART_EBR_COMPAT 663 if (baseentry->gpe_start == 0) 664 bzero(buf, DOSPARTOFF); 665#endif 666 baseentry = next; 667 } while (!error && baseentry != NULL); 668 669 out: 670 g_free(buf); 671 return (error); 672} 673