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/8.3/sys/geom/part/g_part_bsd.c 230569 2012-01-26 09:14:51Z ae $"); 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 <geom/geom.h> 44 #include <geom/part/g_part.h> 45 46 #include "g_part_if.h" 47 48 #define BOOT1_SIZE 512 49 #define LABEL_SIZE 512 50 #define BOOT2_OFF (BOOT1_SIZE + LABEL_SIZE) 51 #define BOOT2_SIZE (BBSIZE - BOOT2_OFF) 52 53 struct g_part_bsd_table { 54 struct g_part_table base; 55 u_char *bbarea; 56 uint32_t offset; 57 }; 58 59 struct g_part_bsd_entry { 60 struct g_part_entry base; 61 struct partition part; 62 }; 63 64 static int g_part_bsd_add(struct g_part_table *, struct g_part_entry *, 65 struct g_part_parms *); 66 static int g_part_bsd_bootcode(struct g_part_table *, struct g_part_parms *); 67 static int g_part_bsd_create(struct g_part_table *, struct g_part_parms *); 68 static int g_part_bsd_destroy(struct g_part_table *, struct g_part_parms *); 69 static void g_part_bsd_dumpconf(struct g_part_table *, struct g_part_entry *, 70 struct sbuf *, const char *); 71 static int g_part_bsd_dumpto(struct g_part_table *, struct g_part_entry *); 72 static int g_part_bsd_modify(struct g_part_table *, struct g_part_entry *, 73 struct g_part_parms *); 74 static const char *g_part_bsd_name(struct g_part_table *, struct g_part_entry *, 75 char *, size_t); 76 static int g_part_bsd_probe(struct g_part_table *, struct g_consumer *); 77 static int g_part_bsd_read(struct g_part_table *, struct g_consumer *); 78 static const char *g_part_bsd_type(struct g_part_table *, struct g_part_entry *, 79 char *, size_t); 80 static int g_part_bsd_write(struct g_part_table *, struct g_consumer *); 81 static int g_part_bsd_resize(struct g_part_table *, struct g_part_entry *, 82 struct g_part_parms *); 83 84 static kobj_method_t g_part_bsd_methods[] = { 85 KOBJMETHOD(g_part_add, g_part_bsd_add), 86 KOBJMETHOD(g_part_bootcode, g_part_bsd_bootcode), 87 KOBJMETHOD(g_part_create, g_part_bsd_create), 88 KOBJMETHOD(g_part_destroy, g_part_bsd_destroy), 89 KOBJMETHOD(g_part_dumpconf, g_part_bsd_dumpconf), 90 KOBJMETHOD(g_part_dumpto, g_part_bsd_dumpto), 91 KOBJMETHOD(g_part_modify, g_part_bsd_modify), 92 KOBJMETHOD(g_part_resize, g_part_bsd_resize), 93 KOBJMETHOD(g_part_name, g_part_bsd_name), 94 KOBJMETHOD(g_part_probe, g_part_bsd_probe), 95 KOBJMETHOD(g_part_read, g_part_bsd_read), 96 KOBJMETHOD(g_part_type, g_part_bsd_type), 97 KOBJMETHOD(g_part_write, g_part_bsd_write), 98 { 0, 0 } 99 }; 100 101 static struct g_part_scheme g_part_bsd_scheme = { 102 "BSD", 103 g_part_bsd_methods, 104 sizeof(struct g_part_bsd_table), 105 .gps_entrysz = sizeof(struct g_part_bsd_entry), 106 .gps_minent = 8, 107 .gps_maxent = 20, /* Only 22 entries fit in 512 byte sectors */ 108 .gps_bootcodesz = BBSIZE, 109 }; 110 G_PART_SCHEME_DECLARE(g_part_bsd); 111 112 static int 113 bsd_parse_type(const char *type, uint8_t *fstype) 114 { 115 const char *alias; 116 char *endp; 117 long lt; 118 119 if (type[0] == '!') { 120 lt = strtol(type + 1, &endp, 0); 121 if (type[1] == '\0' || *endp != '\0' || lt <= 0 || lt >= 256) 122 return (EINVAL); 123 *fstype = (u_int)lt; 124 return (0); 125 } 126 alias = g_part_alias_name(G_PART_ALIAS_FREEBSD_SWAP); 127 if (!strcasecmp(type, alias)) { 128 *fstype = FS_SWAP; 129 return (0); 130 } 131 alias = g_part_alias_name(G_PART_ALIAS_FREEBSD_UFS); 132 if (!strcasecmp(type, alias)) { 133 *fstype = FS_BSDFFS; 134 return (0); 135 } 136 alias = g_part_alias_name(G_PART_ALIAS_FREEBSD_VINUM); 137 if (!strcasecmp(type, alias)) { 138 *fstype = FS_VINUM; 139 return (0); 140 } 141 alias = g_part_alias_name(G_PART_ALIAS_FREEBSD_ZFS); 142 if (!strcasecmp(type, alias)) { 143 *fstype = FS_ZFS; 144 return (0); 145 } 146 return (EINVAL); 147 } 148 149 static int 150 g_part_bsd_add(struct g_part_table *basetable, struct g_part_entry *baseentry, 151 struct g_part_parms *gpp) 152 { 153 struct g_part_bsd_entry *entry; 154 struct g_part_bsd_table *table; 155 156 if (gpp->gpp_parms & G_PART_PARM_LABEL) 157 return (EINVAL); 158 159 entry = (struct g_part_bsd_entry *)baseentry; 160 table = (struct g_part_bsd_table *)basetable; 161 162 entry->part.p_size = gpp->gpp_size; 163 entry->part.p_offset = gpp->gpp_start + table->offset; 164 entry->part.p_fsize = 0; 165 entry->part.p_frag = 0; 166 entry->part.p_cpg = 0; 167 return (bsd_parse_type(gpp->gpp_type, &entry->part.p_fstype)); 168 } 169 170 static int 171 g_part_bsd_bootcode(struct g_part_table *basetable, struct g_part_parms *gpp) 172 { 173 struct g_part_bsd_table *table; 174 const u_char *codeptr; 175 176 if (gpp->gpp_codesize != BOOT1_SIZE && gpp->gpp_codesize != BBSIZE) 177 return (ENODEV); 178 179 table = (struct g_part_bsd_table *)basetable; 180 codeptr = gpp->gpp_codeptr; 181 bcopy(codeptr, table->bbarea, BOOT1_SIZE); 182 if (gpp->gpp_codesize == BBSIZE) 183 bcopy(codeptr + BOOT2_OFF, table->bbarea + BOOT2_OFF, 184 BOOT2_SIZE); 185 return (0); 186 } 187 188 static int 189 g_part_bsd_create(struct g_part_table *basetable, struct g_part_parms *gpp) 190 { 191 struct g_provider *pp; 192 struct g_part_entry *baseentry; 193 struct g_part_bsd_entry *entry; 194 struct g_part_bsd_table *table; 195 u_char *ptr; 196 uint32_t msize, ncyls, secpercyl; 197 198 pp = gpp->gpp_provider; 199 200 if (pp->sectorsize < sizeof(struct disklabel)) 201 return (ENOSPC); 202 if (BBSIZE % pp->sectorsize) 203 return (ENOTBLK); 204 205 msize = MIN(pp->mediasize / pp->sectorsize, UINT32_MAX); 206 secpercyl = basetable->gpt_sectors * basetable->gpt_heads; 207 ncyls = msize / secpercyl; 208 209 table = (struct g_part_bsd_table *)basetable; 210 table->bbarea = g_malloc(BBSIZE, M_WAITOK | M_ZERO); 211 ptr = table->bbarea + pp->sectorsize; 212 213 le32enc(ptr + 0, DISKMAGIC); /* d_magic */ 214 le32enc(ptr + 40, pp->sectorsize); /* d_secsize */ 215 le32enc(ptr + 44, basetable->gpt_sectors); /* d_nsectors */ 216 le32enc(ptr + 48, basetable->gpt_heads); /* d_ntracks */ 217 le32enc(ptr + 52, ncyls); /* d_ncylinders */ 218 le32enc(ptr + 56, secpercyl); /* d_secpercyl */ 219 le32enc(ptr + 60, msize); /* d_secperunit */ 220 le16enc(ptr + 72, 3600); /* d_rpm */ 221 le32enc(ptr + 132, DISKMAGIC); /* d_magic2 */ 222 le16enc(ptr + 138, basetable->gpt_entries); /* d_npartitions */ 223 le32enc(ptr + 140, BBSIZE); /* d_bbsize */ 224 225 basetable->gpt_first = 0; 226 basetable->gpt_last = msize - 1; 227 basetable->gpt_isleaf = 1; 228 229 baseentry = g_part_new_entry(basetable, RAW_PART + 1, 230 basetable->gpt_first, basetable->gpt_last); 231 baseentry->gpe_internal = 1; 232 entry = (struct g_part_bsd_entry *)baseentry; 233 entry->part.p_size = basetable->gpt_last + 1; 234 entry->part.p_offset = table->offset; 235 236 return (0); 237 } 238 239 static int 240 g_part_bsd_destroy(struct g_part_table *basetable, struct g_part_parms *gpp) 241 { 242 struct g_part_bsd_table *table; 243 244 table = (struct g_part_bsd_table *)basetable; 245 if (table->bbarea != NULL) 246 g_free(table->bbarea); 247 table->bbarea = NULL; 248 249 /* Wipe the second sector to clear the partitioning. */ 250 basetable->gpt_smhead |= 2; 251 return (0); 252 } 253 254 static void 255 g_part_bsd_dumpconf(struct g_part_table *table, struct g_part_entry *baseentry, 256 struct sbuf *sb, const char *indent) 257 { 258 struct g_part_bsd_entry *entry; 259 260 entry = (struct g_part_bsd_entry *)baseentry; 261 if (indent == NULL) { 262 /* conftxt: libdisk compatibility */ 263 sbuf_printf(sb, " xs BSD xt %u", entry->part.p_fstype); 264 } else if (entry != NULL) { 265 /* confxml: partition entry information */ 266 sbuf_printf(sb, "%s<rawtype>%u</rawtype>\n", indent, 267 entry->part.p_fstype); 268 } else { 269 /* confxml: scheme information */ 270 } 271 } 272 273 static int 274 g_part_bsd_dumpto(struct g_part_table *table, struct g_part_entry *baseentry) 275 { 276 struct g_part_bsd_entry *entry; 277 278 /* Allow dumping to a swap partition or an unused partition. */ 279 entry = (struct g_part_bsd_entry *)baseentry; 280 return ((entry->part.p_fstype == FS_UNUSED || 281 entry->part.p_fstype == FS_SWAP) ? 1 : 0); 282 } 283 284 static int 285 g_part_bsd_modify(struct g_part_table *basetable, 286 struct g_part_entry *baseentry, struct g_part_parms *gpp) 287 { 288 struct g_part_bsd_entry *entry; 289 290 if (gpp->gpp_parms & G_PART_PARM_LABEL) 291 return (EINVAL); 292 293 entry = (struct g_part_bsd_entry *)baseentry; 294 if (gpp->gpp_parms & G_PART_PARM_TYPE) 295 return (bsd_parse_type(gpp->gpp_type, &entry->part.p_fstype)); 296 return (0); 297 } 298 299 static int 300 g_part_bsd_resize(struct g_part_table *basetable, 301 struct g_part_entry *baseentry, struct g_part_parms *gpp) 302 { 303 struct g_part_bsd_entry *entry; 304 305 entry = (struct g_part_bsd_entry *)baseentry; 306 baseentry->gpe_end = baseentry->gpe_start + gpp->gpp_size - 1; 307 entry->part.p_size = gpp->gpp_size; 308 309 return (0); 310 } 311 312 static const char * 313 g_part_bsd_name(struct g_part_table *table, struct g_part_entry *baseentry, 314 char *buf, size_t bufsz) 315 { 316 317 snprintf(buf, bufsz, "%c", 'a' + baseentry->gpe_index - 1); 318 return (buf); 319 } 320 321 static int 322 g_part_bsd_probe(struct g_part_table *table, struct g_consumer *cp) 323 { 324 struct g_provider *pp; 325 u_char *buf; 326 uint32_t magic1, magic2; 327 int error; 328 329 pp = cp->provider; 330 331 /* Sanity-check the provider. */ 332 if (pp->sectorsize < sizeof(struct disklabel) || 333 pp->mediasize < BBSIZE) 334 return (ENOSPC); 335 if (BBSIZE % pp->sectorsize) 336 return (ENOTBLK); 337 338 /* Check that there's a disklabel. */ 339 buf = g_read_data(cp, pp->sectorsize, pp->sectorsize, &error); 340 if (buf == NULL) 341 return (error); 342 magic1 = le32dec(buf + 0); 343 magic2 = le32dec(buf + 132); 344 g_free(buf); 345 return ((magic1 == DISKMAGIC && magic2 == DISKMAGIC) 346 ? G_PART_PROBE_PRI_HIGH : ENXIO); 347 } 348 349 static int 350 g_part_bsd_read(struct g_part_table *basetable, struct g_consumer *cp) 351 { 352 struct g_provider *pp; 353 struct g_part_bsd_table *table; 354 struct g_part_entry *baseentry; 355 struct g_part_bsd_entry *entry; 356 struct partition part; 357 u_char *buf, *p; 358 off_t chs, msize; 359 u_int sectors, heads; 360 int error, index; 361 362 pp = cp->provider; 363 table = (struct g_part_bsd_table *)basetable; 364 msize = MIN(pp->mediasize / pp->sectorsize, UINT32_MAX); 365 366 table->bbarea = g_read_data(cp, 0, BBSIZE, &error); 367 if (table->bbarea == NULL) 368 return (error); 369 370 buf = table->bbarea + pp->sectorsize; 371 372 if (le32dec(buf + 40) != pp->sectorsize) 373 goto invalid_label; 374 sectors = le32dec(buf + 44); 375 if (sectors < 1 || sectors > 255) 376 goto invalid_label; 377 if (sectors != basetable->gpt_sectors && !basetable->gpt_fixgeom) { 378 g_part_geometry_heads(msize, sectors, &chs, &heads); 379 if (chs != 0) { 380 basetable->gpt_sectors = sectors; 381 basetable->gpt_heads = heads; 382 } 383 } 384 heads = le32dec(buf + 48); 385 if (heads < 1 || heads > 255) 386 goto invalid_label; 387 if (heads != basetable->gpt_heads && !basetable->gpt_fixgeom) 388 basetable->gpt_heads = heads; 389 if (sectors != basetable->gpt_sectors || heads != basetable->gpt_heads) 390 printf("GEOM: %s: geometry does not match label" 391 " (%uh,%us != %uh,%us).\n", pp->name, heads, sectors, 392 basetable->gpt_heads, basetable->gpt_sectors); 393 394 chs = le32dec(buf + 60); 395 if (chs < 1) 396 goto invalid_label; 397 /* Fix-up a sysinstall bug. */ 398 if (chs > msize) { 399 chs = msize; 400 le32enc(buf + 60, msize); 401 } 402 if (chs != msize) 403 printf("GEOM: %s: media size does not match label.\n", 404 pp->name); 405 406 basetable->gpt_first = 0; 407 basetable->gpt_last = msize - 1; 408 basetable->gpt_isleaf = 1; 409 410 basetable->gpt_entries = le16dec(buf + 138); 411 if (basetable->gpt_entries < g_part_bsd_scheme.gps_minent || 412 basetable->gpt_entries > g_part_bsd_scheme.gps_maxent) 413 goto invalid_label; 414 415 table->offset = le32dec(buf + 148 + RAW_PART * 16 + 4); 416 for (index = basetable->gpt_entries - 1; index >= 0; index--) { 417 p = buf + 148 + index * 16; 418 part.p_size = le32dec(p + 0); 419 part.p_offset = le32dec(p + 4); 420 part.p_fsize = le32dec(p + 8); 421 part.p_fstype = p[12]; 422 part.p_frag = p[13]; 423 part.p_cpg = le16dec(p + 14); 424 if (part.p_size == 0) 425 continue; 426 if (part.p_offset < table->offset) 427 continue; 428 if (part.p_offset - table->offset > basetable->gpt_last) 429 goto invalid_label; 430 baseentry = g_part_new_entry(basetable, index + 1, 431 part.p_offset - table->offset, 432 part.p_offset - table->offset + part.p_size - 1); 433 entry = (struct g_part_bsd_entry *)baseentry; 434 entry->part = part; 435 if (index == RAW_PART) 436 baseentry->gpe_internal = 1; 437 } 438 439 return (0); 440 441 invalid_label: 442 printf("GEOM: %s: invalid disklabel.\n", pp->name); 443 g_free(table->bbarea); 444 table->bbarea = NULL; 445 return (EINVAL); 446 } 447 448 static const char * 449 g_part_bsd_type(struct g_part_table *basetable, struct g_part_entry *baseentry, 450 char *buf, size_t bufsz) 451 { 452 struct g_part_bsd_entry *entry; 453 int type; 454 455 entry = (struct g_part_bsd_entry *)baseentry; 456 type = entry->part.p_fstype; 457 if (type == FS_SWAP) 458 return (g_part_alias_name(G_PART_ALIAS_FREEBSD_SWAP)); 459 if (type == FS_BSDFFS) 460 return (g_part_alias_name(G_PART_ALIAS_FREEBSD_UFS)); 461 if (type == FS_VINUM) 462 return (g_part_alias_name(G_PART_ALIAS_FREEBSD_VINUM)); 463 if (type == FS_ZFS) 464 return (g_part_alias_name(G_PART_ALIAS_FREEBSD_ZFS)); 465 snprintf(buf, bufsz, "!%d", type); 466 return (buf); 467 } 468 469 static int 470 g_part_bsd_write(struct g_part_table *basetable, struct g_consumer *cp) 471 { 472 struct g_provider *pp; 473 struct g_part_entry *baseentry; 474 struct g_part_bsd_entry *entry; 475 struct g_part_bsd_table *table; 476 uint16_t sum; 477 u_char *label, *p, *pe; 478 int error, index; 479 480 pp = cp->provider; 481 table = (struct g_part_bsd_table *)basetable; 482 baseentry = LIST_FIRST(&basetable->gpt_entry); 483 label = table->bbarea + pp->sectorsize; 484 for (index = 1; index <= basetable->gpt_entries; index++) { 485 p = label + 148 + (index - 1) * 16; 486 entry = (baseentry != NULL && index == baseentry->gpe_index) 487 ? (struct g_part_bsd_entry *)baseentry : NULL; 488 if (entry != NULL && !baseentry->gpe_deleted) { 489 le32enc(p + 0, entry->part.p_size); 490 le32enc(p + 4, entry->part.p_offset); 491 le32enc(p + 8, entry->part.p_fsize); 492 p[12] = entry->part.p_fstype; 493 p[13] = entry->part.p_frag; 494 le16enc(p + 14, entry->part.p_cpg); 495 } else 496 bzero(p, 16); 497 498 if (entry != NULL) 499 baseentry = LIST_NEXT(baseentry, gpe_entry); 500 } 501 502 /* Calculate checksum. */ 503 le16enc(label + 136, 0); 504 pe = label + 148 + basetable->gpt_entries * 16; 505 sum = 0; 506 for (p = label; p < pe; p += 2) 507 sum ^= le16dec(p); 508 le16enc(label + 136, sum); 509 510 error = g_write_data(cp, 0, table->bbarea, BBSIZE); 511 return (error); 512 }
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