g_part_bsd.c revision 219029
1/*- 2 * Copyright (c) 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: head/sys/geom/part/g_part_bsd.c 219029 2011-02-25 10:24:35Z netchild $"); 29 30#include <sys/param.h> 31#include <sys/bio.h> 32#include <sys/disklabel.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 <sys/sysctl.h> 44#include <geom/geom.h> 45#include <geom/part/g_part.h> 46 47#include "g_part_if.h" 48 49FEATURE(geom_part_bsd, "GEOM partitioning class for BSD disklabels"); 50 51struct g_part_bsd_table { 52 struct g_part_table base; 53 u_char *bbarea; 54 uint32_t offset; 55}; 56 57struct g_part_bsd_entry { 58 struct g_part_entry base; 59 struct partition part; 60}; 61 62static int g_part_bsd_add(struct g_part_table *, struct g_part_entry *, 63 struct g_part_parms *); 64static int g_part_bsd_bootcode(struct g_part_table *, struct g_part_parms *); 65static int g_part_bsd_create(struct g_part_table *, struct g_part_parms *); 66static int g_part_bsd_destroy(struct g_part_table *, struct g_part_parms *); 67static void g_part_bsd_dumpconf(struct g_part_table *, struct g_part_entry *, 68 struct sbuf *, const char *); 69static int g_part_bsd_dumpto(struct g_part_table *, struct g_part_entry *); 70static int g_part_bsd_modify(struct g_part_table *, struct g_part_entry *, 71 struct g_part_parms *); 72static const char *g_part_bsd_name(struct g_part_table *, struct g_part_entry *, 73 char *, size_t); 74static int g_part_bsd_probe(struct g_part_table *, struct g_consumer *); 75static int g_part_bsd_read(struct g_part_table *, struct g_consumer *); 76static const char *g_part_bsd_type(struct g_part_table *, struct g_part_entry *, 77 char *, size_t); 78static int g_part_bsd_write(struct g_part_table *, struct g_consumer *); 79static int g_part_bsd_resize(struct g_part_table *, struct g_part_entry *, 80 struct g_part_parms *); 81 82static kobj_method_t g_part_bsd_methods[] = { 83 KOBJMETHOD(g_part_add, g_part_bsd_add), 84 KOBJMETHOD(g_part_bootcode, g_part_bsd_bootcode), 85 KOBJMETHOD(g_part_create, g_part_bsd_create), 86 KOBJMETHOD(g_part_destroy, g_part_bsd_destroy), 87 KOBJMETHOD(g_part_dumpconf, g_part_bsd_dumpconf), 88 KOBJMETHOD(g_part_dumpto, g_part_bsd_dumpto), 89 KOBJMETHOD(g_part_modify, g_part_bsd_modify), 90 KOBJMETHOD(g_part_resize, g_part_bsd_resize), 91 KOBJMETHOD(g_part_name, g_part_bsd_name), 92 KOBJMETHOD(g_part_probe, g_part_bsd_probe), 93 KOBJMETHOD(g_part_read, g_part_bsd_read), 94 KOBJMETHOD(g_part_type, g_part_bsd_type), 95 KOBJMETHOD(g_part_write, g_part_bsd_write), 96 { 0, 0 } 97}; 98 99static struct g_part_scheme g_part_bsd_scheme = { 100 "BSD", 101 g_part_bsd_methods, 102 sizeof(struct g_part_bsd_table), 103 .gps_entrysz = sizeof(struct g_part_bsd_entry), 104 .gps_minent = 8, 105 .gps_maxent = 20, /* Only 22 entries fit in 512 byte sectors */ 106 .gps_bootcodesz = BBSIZE, 107}; 108G_PART_SCHEME_DECLARE(g_part_bsd); 109 110static int 111bsd_parse_type(const char *type, uint8_t *fstype) 112{ 113 const char *alias; 114 char *endp; 115 long lt; 116 117 if (type[0] == '!') { 118 lt = strtol(type + 1, &endp, 0); 119 if (type[1] == '\0' || *endp != '\0' || lt <= 0 || lt >= 256) 120 return (EINVAL); 121 *fstype = (u_int)lt; 122 return (0); 123 } 124 alias = g_part_alias_name(G_PART_ALIAS_FREEBSD_SWAP); 125 if (!strcasecmp(type, alias)) { 126 *fstype = FS_SWAP; 127 return (0); 128 } 129 alias = g_part_alias_name(G_PART_ALIAS_FREEBSD_UFS); 130 if (!strcasecmp(type, alias)) { 131 *fstype = FS_BSDFFS; 132 return (0); 133 } 134 alias = g_part_alias_name(G_PART_ALIAS_FREEBSD_VINUM); 135 if (!strcasecmp(type, alias)) { 136 *fstype = FS_VINUM; 137 return (0); 138 } 139 alias = g_part_alias_name(G_PART_ALIAS_FREEBSD_ZFS); 140 if (!strcasecmp(type, alias)) { 141 *fstype = FS_ZFS; 142 return (0); 143 } 144 return (EINVAL); 145} 146 147static int 148g_part_bsd_add(struct g_part_table *basetable, struct g_part_entry *baseentry, 149 struct g_part_parms *gpp) 150{ 151 struct g_part_bsd_entry *entry; 152 struct g_part_bsd_table *table; 153 154 if (gpp->gpp_parms & G_PART_PARM_LABEL) 155 return (EINVAL); 156 157 entry = (struct g_part_bsd_entry *)baseentry; 158 table = (struct g_part_bsd_table *)basetable; 159 160 entry->part.p_size = gpp->gpp_size; 161 entry->part.p_offset = gpp->gpp_start + table->offset; 162 entry->part.p_fsize = 0; 163 entry->part.p_frag = 0; 164 entry->part.p_cpg = 0; 165 return (bsd_parse_type(gpp->gpp_type, &entry->part.p_fstype)); 166} 167 168static int 169g_part_bsd_bootcode(struct g_part_table *basetable, struct g_part_parms *gpp) 170{ 171 struct g_part_bsd_table *table; 172 const u_char *codeptr; 173 size_t hdsz, tlsz; 174 size_t codesz, tlofs; 175 176 hdsz = 512; 177 tlofs = hdsz + 148 + basetable->gpt_entries * 16; 178 tlsz = BBSIZE - tlofs; 179 table = (struct g_part_bsd_table *)basetable; 180 bzero(table->bbarea, hdsz); 181 bzero(table->bbarea + tlofs, tlsz); 182 codeptr = gpp->gpp_codeptr; 183 codesz = MIN(hdsz, gpp->gpp_codesize); 184 if (codesz > 0) 185 bcopy(codeptr, table->bbarea, codesz); 186 codesz = MIN(tlsz, gpp->gpp_codesize - tlofs); 187 if (codesz > 0) 188 bcopy(codeptr + tlofs, table->bbarea + tlofs, codesz); 189 return (0); 190} 191 192static int 193g_part_bsd_create(struct g_part_table *basetable, struct g_part_parms *gpp) 194{ 195 struct g_provider *pp; 196 struct g_part_entry *baseentry; 197 struct g_part_bsd_entry *entry; 198 struct g_part_bsd_table *table; 199 u_char *ptr; 200 uint32_t msize, ncyls, secpercyl; 201 202 pp = gpp->gpp_provider; 203 204 if (pp->sectorsize < sizeof(struct disklabel)) 205 return (ENOSPC); 206 if (BBSIZE % pp->sectorsize) 207 return (ENOTBLK); 208 209 msize = MIN(pp->mediasize / pp->sectorsize, 0xffffffff); 210 secpercyl = basetable->gpt_sectors * basetable->gpt_heads; 211 ncyls = msize / secpercyl; 212 213 table = (struct g_part_bsd_table *)basetable; 214 table->bbarea = g_malloc(BBSIZE, M_WAITOK | M_ZERO); 215 ptr = table->bbarea + pp->sectorsize; 216 217 le32enc(ptr + 0, DISKMAGIC); /* d_magic */ 218 le32enc(ptr + 40, pp->sectorsize); /* d_secsize */ 219 le32enc(ptr + 44, basetable->gpt_sectors); /* d_nsectors */ 220 le32enc(ptr + 48, basetable->gpt_heads); /* d_ntracks */ 221 le32enc(ptr + 52, ncyls); /* d_ncylinders */ 222 le32enc(ptr + 56, secpercyl); /* d_secpercyl */ 223 le32enc(ptr + 60, msize); /* d_secperunit */ 224 le16enc(ptr + 72, 3600); /* d_rpm */ 225 le32enc(ptr + 132, DISKMAGIC); /* d_magic2 */ 226 le16enc(ptr + 138, basetable->gpt_entries); /* d_npartitions */ 227 le32enc(ptr + 140, BBSIZE); /* d_bbsize */ 228 229 basetable->gpt_first = 0; 230 basetable->gpt_last = msize - 1; 231 basetable->gpt_isleaf = 1; 232 233 baseentry = g_part_new_entry(basetable, RAW_PART + 1, 234 basetable->gpt_first, basetable->gpt_last); 235 baseentry->gpe_internal = 1; 236 entry = (struct g_part_bsd_entry *)baseentry; 237 entry->part.p_size = basetable->gpt_last + 1; 238 entry->part.p_offset = table->offset; 239 240 return (0); 241} 242 243static int 244g_part_bsd_destroy(struct g_part_table *basetable, struct g_part_parms *gpp) 245{ 246 struct g_part_bsd_table *table; 247 248 table = (struct g_part_bsd_table *)basetable; 249 if (table->bbarea != NULL) 250 g_free(table->bbarea); 251 table->bbarea = NULL; 252 253 /* Wipe the second sector to clear the partitioning. */ 254 basetable->gpt_smhead |= 2; 255 return (0); 256} 257 258static void 259g_part_bsd_dumpconf(struct g_part_table *table, struct g_part_entry *baseentry, 260 struct sbuf *sb, const char *indent) 261{ 262 struct g_part_bsd_entry *entry; 263 264 entry = (struct g_part_bsd_entry *)baseentry; 265 if (indent == NULL) { 266 /* conftxt: libdisk compatibility */ 267 sbuf_printf(sb, " xs BSD xt %u", entry->part.p_fstype); 268 } else if (entry != NULL) { 269 /* confxml: partition entry information */ 270 sbuf_printf(sb, "%s<rawtype>%u</rawtype>\n", indent, 271 entry->part.p_fstype); 272 } else { 273 /* confxml: scheme information */ 274 } 275} 276 277static int 278g_part_bsd_dumpto(struct g_part_table *table, struct g_part_entry *baseentry) 279{ 280 struct g_part_bsd_entry *entry; 281 282 /* Allow dumping to a swap partition or an unused partition. */ 283 entry = (struct g_part_bsd_entry *)baseentry; 284 return ((entry->part.p_fstype == FS_UNUSED || 285 entry->part.p_fstype == FS_SWAP) ? 1 : 0); 286} 287 288static int 289g_part_bsd_modify(struct g_part_table *basetable, 290 struct g_part_entry *baseentry, struct g_part_parms *gpp) 291{ 292 struct g_part_bsd_entry *entry; 293 294 if (gpp->gpp_parms & G_PART_PARM_LABEL) 295 return (EINVAL); 296 297 entry = (struct g_part_bsd_entry *)baseentry; 298 if (gpp->gpp_parms & G_PART_PARM_TYPE) 299 return (bsd_parse_type(gpp->gpp_type, &entry->part.p_fstype)); 300 return (0); 301} 302 303static int 304g_part_bsd_resize(struct g_part_table *basetable, 305 struct g_part_entry *baseentry, struct g_part_parms *gpp) 306{ 307 struct g_part_bsd_entry *entry; 308 309 entry = (struct g_part_bsd_entry *)baseentry; 310 baseentry->gpe_end = baseentry->gpe_start + gpp->gpp_size - 1; 311 entry->part.p_size = gpp->gpp_size; 312 313 return (0); 314} 315 316static const char * 317g_part_bsd_name(struct g_part_table *table, struct g_part_entry *baseentry, 318 char *buf, size_t bufsz) 319{ 320 321 snprintf(buf, bufsz, "%c", 'a' + baseentry->gpe_index - 1); 322 return (buf); 323} 324 325static int 326g_part_bsd_probe(struct g_part_table *table, struct g_consumer *cp) 327{ 328 struct g_provider *pp; 329 u_char *buf; 330 uint32_t magic1, magic2; 331 int error; 332 333 pp = cp->provider; 334 335 /* Sanity-check the provider. */ 336 if (pp->sectorsize < sizeof(struct disklabel) || 337 pp->mediasize < BBSIZE) 338 return (ENOSPC); 339 if (BBSIZE % pp->sectorsize) 340 return (ENOTBLK); 341 342 /* Check that there's a disklabel. */ 343 buf = g_read_data(cp, pp->sectorsize, pp->sectorsize, &error); 344 if (buf == NULL) 345 return (error); 346 magic1 = le32dec(buf + 0); 347 magic2 = le32dec(buf + 132); 348 g_free(buf); 349 return ((magic1 == DISKMAGIC && magic2 == DISKMAGIC) 350 ? G_PART_PROBE_PRI_HIGH : ENXIO); 351} 352 353static int 354g_part_bsd_read(struct g_part_table *basetable, struct g_consumer *cp) 355{ 356 struct g_provider *pp; 357 struct g_part_bsd_table *table; 358 struct g_part_entry *baseentry; 359 struct g_part_bsd_entry *entry; 360 struct partition part; 361 u_char *buf, *p; 362 off_t chs, msize; 363 u_int sectors, heads; 364 int error, index; 365 366 pp = cp->provider; 367 table = (struct g_part_bsd_table *)basetable; 368 msize = pp->mediasize / pp->sectorsize; 369 370 table->bbarea = g_read_data(cp, 0, BBSIZE, &error); 371 if (table->bbarea == NULL) 372 return (error); 373 374 buf = table->bbarea + pp->sectorsize; 375 376 if (le32dec(buf + 40) != pp->sectorsize) 377 goto invalid_label; 378 sectors = le32dec(buf + 44); 379 if (sectors < 1 || sectors > 255) 380 goto invalid_label; 381 if (sectors != basetable->gpt_sectors && !basetable->gpt_fixgeom) { 382 g_part_geometry_heads(msize, sectors, &chs, &heads); 383 if (chs != 0) { 384 basetable->gpt_sectors = sectors; 385 basetable->gpt_heads = heads; 386 } 387 } 388 heads = le32dec(buf + 48); 389 if (heads < 1 || heads > 255) 390 goto invalid_label; 391 if (heads != basetable->gpt_heads && !basetable->gpt_fixgeom) 392 basetable->gpt_heads = heads; 393 if (sectors != basetable->gpt_sectors || heads != basetable->gpt_heads) 394 printf("GEOM: %s: geometry does not match label" 395 " (%uh,%us != %uh,%us).\n", pp->name, heads, sectors, 396 basetable->gpt_heads, basetable->gpt_sectors); 397 398 chs = le32dec(buf + 60); 399 if (chs < 1) 400 goto invalid_label; 401 /* Fix-up a sysinstall bug. */ 402 if (chs > msize) { 403 chs = msize; 404 le32enc(buf + 60, msize); 405 } 406 if (chs != msize) 407 printf("GEOM: %s: media size does not match label.\n", 408 pp->name); 409 410 basetable->gpt_first = 0; 411 basetable->gpt_last = msize - 1; 412 basetable->gpt_isleaf = 1; 413 414 basetable->gpt_entries = le16dec(buf + 138); 415 if (basetable->gpt_entries < g_part_bsd_scheme.gps_minent || 416 basetable->gpt_entries > g_part_bsd_scheme.gps_maxent) 417 goto invalid_label; 418 419 table->offset = le32dec(buf + 148 + RAW_PART * 16 + 4); 420 for (index = basetable->gpt_entries - 1; index >= 0; index--) { 421 p = buf + 148 + index * 16; 422 part.p_size = le32dec(p + 0); 423 part.p_offset = le32dec(p + 4); 424 part.p_fsize = le32dec(p + 8); 425 part.p_fstype = p[12]; 426 part.p_frag = p[13]; 427 part.p_cpg = le16dec(p + 14); 428 if (part.p_size == 0) 429 continue; 430 if (part.p_offset < table->offset) 431 continue; 432 if (part.p_offset - table->offset > basetable->gpt_last) 433 goto invalid_label; 434 baseentry = g_part_new_entry(basetable, index + 1, 435 part.p_offset - table->offset, 436 part.p_offset - table->offset + part.p_size - 1); 437 entry = (struct g_part_bsd_entry *)baseentry; 438 entry->part = part; 439 if (index == RAW_PART) 440 baseentry->gpe_internal = 1; 441 } 442 443 return (0); 444 445 invalid_label: 446 printf("GEOM: %s: invalid disklabel.\n", pp->name); 447 g_free(table->bbarea); 448 table->bbarea = NULL; 449 return (EINVAL); 450} 451 452static const char * 453g_part_bsd_type(struct g_part_table *basetable, struct g_part_entry *baseentry, 454 char *buf, size_t bufsz) 455{ 456 struct g_part_bsd_entry *entry; 457 int type; 458 459 entry = (struct g_part_bsd_entry *)baseentry; 460 type = entry->part.p_fstype; 461 if (type == FS_SWAP) 462 return (g_part_alias_name(G_PART_ALIAS_FREEBSD_SWAP)); 463 if (type == FS_BSDFFS) 464 return (g_part_alias_name(G_PART_ALIAS_FREEBSD_UFS)); 465 if (type == FS_VINUM) 466 return (g_part_alias_name(G_PART_ALIAS_FREEBSD_VINUM)); 467 if (type == FS_ZFS) 468 return (g_part_alias_name(G_PART_ALIAS_FREEBSD_ZFS)); 469 snprintf(buf, bufsz, "!%d", type); 470 return (buf); 471} 472 473static int 474g_part_bsd_write(struct g_part_table *basetable, struct g_consumer *cp) 475{ 476 struct g_provider *pp; 477 struct g_part_entry *baseentry; 478 struct g_part_bsd_entry *entry; 479 struct g_part_bsd_table *table; 480 uint16_t sum; 481 u_char *label, *p, *pe; 482 int error, index; 483 484 pp = cp->provider; 485 table = (struct g_part_bsd_table *)basetable; 486 baseentry = LIST_FIRST(&basetable->gpt_entry); 487 label = table->bbarea + pp->sectorsize; 488 for (index = 1; index <= basetable->gpt_entries; index++) { 489 p = label + 148 + (index - 1) * 16; 490 entry = (baseentry != NULL && index == baseentry->gpe_index) 491 ? (struct g_part_bsd_entry *)baseentry : NULL; 492 if (entry != NULL && !baseentry->gpe_deleted) { 493 le32enc(p + 0, entry->part.p_size); 494 le32enc(p + 4, entry->part.p_offset); 495 le32enc(p + 8, entry->part.p_fsize); 496 p[12] = entry->part.p_fstype; 497 p[13] = entry->part.p_frag; 498 le16enc(p + 14, entry->part.p_cpg); 499 } else 500 bzero(p, 16); 501 502 if (entry != NULL) 503 baseentry = LIST_NEXT(baseentry, gpe_entry); 504 } 505 506 /* Calculate checksum. */ 507 le16enc(label + 136, 0); 508 pe = label + 148 + basetable->gpt_entries * 16; 509 sum = 0; 510 for (p = label; p < pe; p += 2) 511 sum ^= le16dec(p); 512 le16enc(label + 136, sum); 513 514 error = g_write_data(cp, 0, table->bbarea, BBSIZE); 515 return (error); 516} 517