Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/geom/part/g_part_bsd.c
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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: releng/10.0/sys/geom/part/g_part_bsd.c 236023 2012-05-25 20:33:34Z marcel $"); 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 49 #define BOOT1_SIZE 512 50 #define LABEL_SIZE 512 51 #define BOOT2_OFF (BOOT1_SIZE + LABEL_SIZE) 52 #define BOOT2_SIZE (BBSIZE - BOOT2_OFF) 53 54 FEATURE(geom_part_bsd, "GEOM partitioning class for BSD disklabels"); 55 56 struct g_part_bsd_table { 57 struct g_part_table base; 58 u_char *bbarea; 59 uint32_t offset; 60 }; 61 62 struct g_part_bsd_entry { 63 struct g_part_entry base; 64 struct partition part; 65 }; 66 67 static int g_part_bsd_add(struct g_part_table *, struct g_part_entry *, 68 struct g_part_parms *); 69 static int g_part_bsd_bootcode(struct g_part_table *, struct g_part_parms *); 70 static int g_part_bsd_create(struct g_part_table *, struct g_part_parms *); 71 static int g_part_bsd_destroy(struct g_part_table *, struct g_part_parms *); 72 static void g_part_bsd_dumpconf(struct g_part_table *, struct g_part_entry *, 73 struct sbuf *, const char *); 74 static int g_part_bsd_dumpto(struct g_part_table *, struct g_part_entry *); 75 static int g_part_bsd_modify(struct g_part_table *, struct g_part_entry *, 76 struct g_part_parms *); 77 static const char *g_part_bsd_name(struct g_part_table *, struct g_part_entry *, 78 char *, size_t); 79 static int g_part_bsd_probe(struct g_part_table *, struct g_consumer *); 80 static int g_part_bsd_read(struct g_part_table *, struct g_consumer *); 81 static const char *g_part_bsd_type(struct g_part_table *, struct g_part_entry *, 82 char *, size_t); 83 static int g_part_bsd_write(struct g_part_table *, struct g_consumer *); 84 static int g_part_bsd_resize(struct g_part_table *, struct g_part_entry *, 85 struct g_part_parms *); 86 87 static kobj_method_t g_part_bsd_methods[] = { 88 KOBJMETHOD(g_part_add, g_part_bsd_add), 89 KOBJMETHOD(g_part_bootcode, g_part_bsd_bootcode), 90 KOBJMETHOD(g_part_create, g_part_bsd_create), 91 KOBJMETHOD(g_part_destroy, g_part_bsd_destroy), 92 KOBJMETHOD(g_part_dumpconf, g_part_bsd_dumpconf), 93 KOBJMETHOD(g_part_dumpto, g_part_bsd_dumpto), 94 KOBJMETHOD(g_part_modify, g_part_bsd_modify), 95 KOBJMETHOD(g_part_resize, g_part_bsd_resize), 96 KOBJMETHOD(g_part_name, g_part_bsd_name), 97 KOBJMETHOD(g_part_probe, g_part_bsd_probe), 98 KOBJMETHOD(g_part_read, g_part_bsd_read), 99 KOBJMETHOD(g_part_type, g_part_bsd_type), 100 KOBJMETHOD(g_part_write, g_part_bsd_write), 101 { 0, 0 } 102 }; 103 104 static struct g_part_scheme g_part_bsd_scheme = { 105 "BSD", 106 g_part_bsd_methods, 107 sizeof(struct g_part_bsd_table), 108 .gps_entrysz = sizeof(struct g_part_bsd_entry), 109 .gps_minent = 8, 110 .gps_maxent = 20, /* Only 22 entries fit in 512 byte sectors */ 111 .gps_bootcodesz = BBSIZE, 112 }; 113 G_PART_SCHEME_DECLARE(g_part_bsd); 114 115 static int 116 bsd_parse_type(const char *type, uint8_t *fstype) 117 { 118 const char *alias; 119 char *endp; 120 long lt; 121 122 if (type[0] == '!') { 123 lt = strtol(type + 1, &endp, 0); 124 if (type[1] == '\0' || *endp != '\0' || lt <= 0 || lt >= 256) 125 return (EINVAL); 126 *fstype = (u_int)lt; 127 return (0); 128 } 129 alias = g_part_alias_name(G_PART_ALIAS_FREEBSD_NANDFS); 130 if (!strcasecmp(type, alias)) { 131 *fstype = FS_NANDFS; 132 return (0); 133 } 134 alias = g_part_alias_name(G_PART_ALIAS_FREEBSD_SWAP); 135 if (!strcasecmp(type, alias)) { 136 *fstype = FS_SWAP; 137 return (0); 138 } 139 alias = g_part_alias_name(G_PART_ALIAS_FREEBSD_UFS); 140 if (!strcasecmp(type, alias)) { 141 *fstype = FS_BSDFFS; 142 return (0); 143 } 144 alias = g_part_alias_name(G_PART_ALIAS_FREEBSD_VINUM); 145 if (!strcasecmp(type, alias)) { 146 *fstype = FS_VINUM; 147 return (0); 148 } 149 alias = g_part_alias_name(G_PART_ALIAS_FREEBSD_ZFS); 150 if (!strcasecmp(type, alias)) { 151 *fstype = FS_ZFS; 152 return (0); 153 } 154 return (EINVAL); 155 } 156 157 static int 158 g_part_bsd_add(struct g_part_table *basetable, struct g_part_entry *baseentry, 159 struct g_part_parms *gpp) 160 { 161 struct g_part_bsd_entry *entry; 162 struct g_part_bsd_table *table; 163 164 if (gpp->gpp_parms & G_PART_PARM_LABEL) 165 return (EINVAL); 166 167 entry = (struct g_part_bsd_entry *)baseentry; 168 table = (struct g_part_bsd_table *)basetable; 169 170 entry->part.p_size = gpp->gpp_size; 171 entry->part.p_offset = gpp->gpp_start + table->offset; 172 entry->part.p_fsize = 0; 173 entry->part.p_frag = 0; 174 entry->part.p_cpg = 0; 175 return (bsd_parse_type(gpp->gpp_type, &entry->part.p_fstype)); 176 } 177 178 static int 179 g_part_bsd_bootcode(struct g_part_table *basetable, struct g_part_parms *gpp) 180 { 181 struct g_part_bsd_table *table; 182 const u_char *codeptr; 183 184 if (gpp->gpp_codesize != BOOT1_SIZE && gpp->gpp_codesize != BBSIZE) 185 return (ENODEV); 186 187 table = (struct g_part_bsd_table *)basetable; 188 codeptr = gpp->gpp_codeptr; 189 bcopy(codeptr, table->bbarea, BOOT1_SIZE); 190 if (gpp->gpp_codesize == BBSIZE) 191 bcopy(codeptr + BOOT2_OFF, table->bbarea + BOOT2_OFF, 192 BOOT2_SIZE); 193 return (0); 194 } 195 196 static int 197 g_part_bsd_create(struct g_part_table *basetable, struct g_part_parms *gpp) 198 { 199 struct g_provider *pp; 200 struct g_part_entry *baseentry; 201 struct g_part_bsd_entry *entry; 202 struct g_part_bsd_table *table; 203 u_char *ptr; 204 uint32_t msize, ncyls, secpercyl; 205 206 pp = gpp->gpp_provider; 207 208 if (pp->sectorsize < sizeof(struct disklabel)) 209 return (ENOSPC); 210 if (BBSIZE % pp->sectorsize) 211 return (ENOTBLK); 212 213 msize = MIN(pp->mediasize / pp->sectorsize, UINT32_MAX); 214 secpercyl = basetable->gpt_sectors * basetable->gpt_heads; 215 ncyls = msize / secpercyl; 216 217 table = (struct g_part_bsd_table *)basetable; 218 table->bbarea = g_malloc(BBSIZE, M_WAITOK | M_ZERO); 219 ptr = table->bbarea + pp->sectorsize; 220 221 le32enc(ptr + 0, DISKMAGIC); /* d_magic */ 222 le32enc(ptr + 40, pp->sectorsize); /* d_secsize */ 223 le32enc(ptr + 44, basetable->gpt_sectors); /* d_nsectors */ 224 le32enc(ptr + 48, basetable->gpt_heads); /* d_ntracks */ 225 le32enc(ptr + 52, ncyls); /* d_ncylinders */ 226 le32enc(ptr + 56, secpercyl); /* d_secpercyl */ 227 le32enc(ptr + 60, msize); /* d_secperunit */ 228 le16enc(ptr + 72, 3600); /* d_rpm */ 229 le32enc(ptr + 132, DISKMAGIC); /* d_magic2 */ 230 le16enc(ptr + 138, basetable->gpt_entries); /* d_npartitions */ 231 le32enc(ptr + 140, BBSIZE); /* d_bbsize */ 232 233 basetable->gpt_first = 0; 234 basetable->gpt_last = msize - 1; 235 basetable->gpt_isleaf = 1; 236 237 baseentry = g_part_new_entry(basetable, RAW_PART + 1, 238 basetable->gpt_first, basetable->gpt_last); 239 baseentry->gpe_internal = 1; 240 entry = (struct g_part_bsd_entry *)baseentry; 241 entry->part.p_size = basetable->gpt_last + 1; 242 entry->part.p_offset = table->offset; 243 244 return (0); 245 } 246 247 static int 248 g_part_bsd_destroy(struct g_part_table *basetable, struct g_part_parms *gpp) 249 { 250 struct g_part_bsd_table *table; 251 252 table = (struct g_part_bsd_table *)basetable; 253 if (table->bbarea != NULL) 254 g_free(table->bbarea); 255 table->bbarea = NULL; 256 257 /* Wipe the second sector to clear the partitioning. */ 258 basetable->gpt_smhead |= 2; 259 return (0); 260 } 261 262 static void 263 g_part_bsd_dumpconf(struct g_part_table *table, struct g_part_entry *baseentry, 264 struct sbuf *sb, const char *indent) 265 { 266 struct g_part_bsd_entry *entry; 267 268 entry = (struct g_part_bsd_entry *)baseentry; 269 if (indent == NULL) { 270 /* conftxt: libdisk compatibility */ 271 sbuf_printf(sb, " xs BSD xt %u", entry->part.p_fstype); 272 } else if (entry != NULL) { 273 /* confxml: partition entry information */ 274 sbuf_printf(sb, "%s<rawtype>%u</rawtype>\n", indent, 275 entry->part.p_fstype); 276 } else { 277 /* confxml: scheme information */ 278 } 279 } 280 281 static int 282 g_part_bsd_dumpto(struct g_part_table *table, struct g_part_entry *baseentry) 283 { 284 struct g_part_bsd_entry *entry; 285 286 /* Allow dumping to a swap partition or an unused partition. */ 287 entry = (struct g_part_bsd_entry *)baseentry; 288 return ((entry->part.p_fstype == FS_UNUSED || 289 entry->part.p_fstype == FS_SWAP) ? 1 : 0); 290 } 291 292 static int 293 g_part_bsd_modify(struct g_part_table *basetable, 294 struct g_part_entry *baseentry, struct g_part_parms *gpp) 295 { 296 struct g_part_bsd_entry *entry; 297 298 if (gpp->gpp_parms & G_PART_PARM_LABEL) 299 return (EINVAL); 300 301 entry = (struct g_part_bsd_entry *)baseentry; 302 if (gpp->gpp_parms & G_PART_PARM_TYPE) 303 return (bsd_parse_type(gpp->gpp_type, &entry->part.p_fstype)); 304 return (0); 305 } 306 307 static int 308 g_part_bsd_resize(struct g_part_table *basetable, 309 struct g_part_entry *baseentry, struct g_part_parms *gpp) 310 { 311 struct g_part_bsd_entry *entry; 312 313 entry = (struct g_part_bsd_entry *)baseentry; 314 baseentry->gpe_end = baseentry->gpe_start + gpp->gpp_size - 1; 315 entry->part.p_size = gpp->gpp_size; 316 317 return (0); 318 } 319 320 static const char * 321 g_part_bsd_name(struct g_part_table *table, struct g_part_entry *baseentry, 322 char *buf, size_t bufsz) 323 { 324 325 snprintf(buf, bufsz, "%c", 'a' + baseentry->gpe_index - 1); 326 return (buf); 327 } 328 329 static int 330 g_part_bsd_probe(struct g_part_table *table, struct g_consumer *cp) 331 { 332 struct g_provider *pp; 333 u_char *buf; 334 uint32_t magic1, magic2; 335 int error; 336 337 pp = cp->provider; 338 339 /* Sanity-check the provider. */ 340 if (pp->sectorsize < sizeof(struct disklabel) || 341 pp->mediasize < BBSIZE) 342 return (ENOSPC); 343 if (BBSIZE % pp->sectorsize) 344 return (ENOTBLK); 345 346 /* Check that there's a disklabel. */ 347 buf = g_read_data(cp, pp->sectorsize, pp->sectorsize, &error); 348 if (buf == NULL) 349 return (error); 350 magic1 = le32dec(buf + 0); 351 magic2 = le32dec(buf + 132); 352 g_free(buf); 353 return ((magic1 == DISKMAGIC && magic2 == DISKMAGIC) 354 ? G_PART_PROBE_PRI_HIGH : ENXIO); 355 } 356 357 static int 358 g_part_bsd_read(struct g_part_table *basetable, struct g_consumer *cp) 359 { 360 struct g_provider *pp; 361 struct g_part_bsd_table *table; 362 struct g_part_entry *baseentry; 363 struct g_part_bsd_entry *entry; 364 struct partition part; 365 u_char *buf, *p; 366 off_t chs, msize; 367 u_int sectors, heads; 368 int error, index; 369 370 pp = cp->provider; 371 table = (struct g_part_bsd_table *)basetable; 372 msize = MIN(pp->mediasize / pp->sectorsize, UINT32_MAX); 373 374 table->bbarea = g_read_data(cp, 0, BBSIZE, &error); 375 if (table->bbarea == NULL) 376 return (error); 377 378 buf = table->bbarea + pp->sectorsize; 379 380 if (le32dec(buf + 40) != pp->sectorsize) 381 goto invalid_label; 382 sectors = le32dec(buf + 44); 383 if (sectors < 1 || sectors > 255) 384 goto invalid_label; 385 if (sectors != basetable->gpt_sectors && !basetable->gpt_fixgeom) { 386 g_part_geometry_heads(msize, sectors, &chs, &heads); 387 if (chs != 0) { 388 basetable->gpt_sectors = sectors; 389 basetable->gpt_heads = heads; 390 } 391 } 392 heads = le32dec(buf + 48); 393 if (heads < 1 || heads > 255) 394 goto invalid_label; 395 if (heads != basetable->gpt_heads && !basetable->gpt_fixgeom) 396 basetable->gpt_heads = heads; 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 } 406 407 basetable->gpt_first = 0; 408 basetable->gpt_last = msize - 1; 409 basetable->gpt_isleaf = 1; 410 411 basetable->gpt_entries = le16dec(buf + 138); 412 if (basetable->gpt_entries < g_part_bsd_scheme.gps_minent || 413 basetable->gpt_entries > g_part_bsd_scheme.gps_maxent) 414 goto invalid_label; 415 416 table->offset = le32dec(buf + 148 + RAW_PART * 16 + 4); 417 for (index = basetable->gpt_entries - 1; index >= 0; index--) { 418 p = buf + 148 + index * 16; 419 part.p_size = le32dec(p + 0); 420 part.p_offset = le32dec(p + 4); 421 part.p_fsize = le32dec(p + 8); 422 part.p_fstype = p[12]; 423 part.p_frag = p[13]; 424 part.p_cpg = le16dec(p + 14); 425 if (part.p_size == 0) 426 continue; 427 if (part.p_offset < table->offset) 428 continue; 429 if (part.p_offset - table->offset > basetable->gpt_last) 430 goto invalid_label; 431 baseentry = g_part_new_entry(basetable, index + 1, 432 part.p_offset - table->offset, 433 part.p_offset - table->offset + part.p_size - 1); 434 entry = (struct g_part_bsd_entry *)baseentry; 435 entry->part = part; 436 if (index == RAW_PART) 437 baseentry->gpe_internal = 1; 438 } 439 440 return (0); 441 442 invalid_label: 443 printf("GEOM: %s: invalid disklabel.\n", pp->name); 444 g_free(table->bbarea); 445 table->bbarea = NULL; 446 return (EINVAL); 447 } 448 449 static const char * 450 g_part_bsd_type(struct g_part_table *basetable, struct g_part_entry *baseentry, 451 char *buf, size_t bufsz) 452 { 453 struct g_part_bsd_entry *entry; 454 int type; 455 456 entry = (struct g_part_bsd_entry *)baseentry; 457 type = entry->part.p_fstype; 458 if (type == FS_NANDFS) 459 return (g_part_alias_name(G_PART_ALIAS_FREEBSD_NANDFS)); 460 if (type == FS_SWAP) 461 return (g_part_alias_name(G_PART_ALIAS_FREEBSD_SWAP)); 462 if (type == FS_BSDFFS) 463 return (g_part_alias_name(G_PART_ALIAS_FREEBSD_UFS)); 464 if (type == FS_VINUM) 465 return (g_part_alias_name(G_PART_ALIAS_FREEBSD_VINUM)); 466 if (type == FS_ZFS) 467 return (g_part_alias_name(G_PART_ALIAS_FREEBSD_ZFS)); 468 snprintf(buf, bufsz, "!%d", type); 469 return (buf); 470 } 471 472 static int 473 g_part_bsd_write(struct g_part_table *basetable, struct g_consumer *cp) 474 { 475 struct g_provider *pp; 476 struct g_part_entry *baseentry; 477 struct g_part_bsd_entry *entry; 478 struct g_part_bsd_table *table; 479 uint16_t sum; 480 u_char *label, *p, *pe; 481 int error, index; 482 483 pp = cp->provider; 484 table = (struct g_part_bsd_table *)basetable; 485 baseentry = LIST_FIRST(&basetable->gpt_entry); 486 label = table->bbarea + pp->sectorsize; 487 for (index = 1; index <= basetable->gpt_entries; index++) { 488 p = label + 148 + (index - 1) * 16; 489 entry = (baseentry != NULL && index == baseentry->gpe_index) 490 ? (struct g_part_bsd_entry *)baseentry : NULL; 491 if (entry != NULL && !baseentry->gpe_deleted) { 492 le32enc(p + 0, entry->part.p_size); 493 le32enc(p + 4, entry->part.p_offset); 494 le32enc(p + 8, entry->part.p_fsize); 495 p[12] = entry->part.p_fstype; 496 p[13] = entry->part.p_frag; 497 le16enc(p + 14, entry->part.p_cpg); 498 } else 499 bzero(p, 16); 500 501 if (entry != NULL) 502 baseentry = LIST_NEXT(baseentry, gpe_entry); 503 } 504 505 /* Calculate checksum. */ 506 le16enc(label + 136, 0); 507 pe = label + 148 + basetable->gpt_entries * 16; 508 sum = 0; 509 for (p = label; p < pe; p += 2) 510 sum ^= le16dec(p); 511 le16enc(label + 136, sum); 512 513 error = g_write_data(cp, 0, table->bbarea, BBSIZE); 514 return (error); 515 }
Cache object: eb083daa1ac0bab82624ca8806569e85
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