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/8.0/sys/geom/part/g_part_bsd.c 190463 2009-03-27 05:48:42Z 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 <geom/geom.h> 44 #include <geom/part/g_part.h> 45 46 #include "g_part_if.h" 47 48 struct g_part_bsd_table { 49 struct g_part_table base; 50 u_char *bbarea; 51 uint32_t offset; 52 }; 53 54 struct g_part_bsd_entry { 55 struct g_part_entry base; 56 struct partition part; 57 }; 58 59 static int g_part_bsd_add(struct g_part_table *, struct g_part_entry *, 60 struct g_part_parms *); 61 static int g_part_bsd_bootcode(struct g_part_table *, struct g_part_parms *); 62 static int g_part_bsd_create(struct g_part_table *, struct g_part_parms *); 63 static int g_part_bsd_destroy(struct g_part_table *, struct g_part_parms *); 64 static void g_part_bsd_dumpconf(struct g_part_table *, struct g_part_entry *, 65 struct sbuf *, const char *); 66 static int g_part_bsd_dumpto(struct g_part_table *, struct g_part_entry *); 67 static int g_part_bsd_modify(struct g_part_table *, struct g_part_entry *, 68 struct g_part_parms *); 69 static const char *g_part_bsd_name(struct g_part_table *, struct g_part_entry *, 70 char *, size_t); 71 static int g_part_bsd_probe(struct g_part_table *, struct g_consumer *); 72 static int g_part_bsd_read(struct g_part_table *, struct g_consumer *); 73 static const char *g_part_bsd_type(struct g_part_table *, struct g_part_entry *, 74 char *, size_t); 75 static int g_part_bsd_write(struct g_part_table *, struct g_consumer *); 76 77 static kobj_method_t g_part_bsd_methods[] = { 78 KOBJMETHOD(g_part_add, g_part_bsd_add), 79 KOBJMETHOD(g_part_bootcode, g_part_bsd_bootcode), 80 KOBJMETHOD(g_part_create, g_part_bsd_create), 81 KOBJMETHOD(g_part_destroy, g_part_bsd_destroy), 82 KOBJMETHOD(g_part_dumpconf, g_part_bsd_dumpconf), 83 KOBJMETHOD(g_part_dumpto, g_part_bsd_dumpto), 84 KOBJMETHOD(g_part_modify, g_part_bsd_modify), 85 KOBJMETHOD(g_part_name, g_part_bsd_name), 86 KOBJMETHOD(g_part_probe, g_part_bsd_probe), 87 KOBJMETHOD(g_part_read, g_part_bsd_read), 88 KOBJMETHOD(g_part_type, g_part_bsd_type), 89 KOBJMETHOD(g_part_write, g_part_bsd_write), 90 { 0, 0 } 91 }; 92 93 static struct g_part_scheme g_part_bsd_scheme = { 94 "BSD", 95 g_part_bsd_methods, 96 sizeof(struct g_part_bsd_table), 97 .gps_entrysz = sizeof(struct g_part_bsd_entry), 98 .gps_minent = 8, 99 .gps_maxent = 20, 100 .gps_bootcodesz = BBSIZE, 101 }; 102 G_PART_SCHEME_DECLARE(g_part_bsd); 103 104 static int 105 bsd_parse_type(const char *type, uint8_t *fstype) 106 { 107 const char *alias; 108 char *endp; 109 long lt; 110 111 if (type[0] == '!') { 112 lt = strtol(type + 1, &endp, 0); 113 if (type[1] == '\0' || *endp != '\0' || lt <= 0 || lt >= 256) 114 return (EINVAL); 115 *fstype = (u_int)lt; 116 return (0); 117 } 118 alias = g_part_alias_name(G_PART_ALIAS_FREEBSD_SWAP); 119 if (!strcasecmp(type, alias)) { 120 *fstype = FS_SWAP; 121 return (0); 122 } 123 alias = g_part_alias_name(G_PART_ALIAS_FREEBSD_UFS); 124 if (!strcasecmp(type, alias)) { 125 *fstype = FS_BSDFFS; 126 return (0); 127 } 128 alias = g_part_alias_name(G_PART_ALIAS_FREEBSD_VINUM); 129 if (!strcasecmp(type, alias)) { 130 *fstype = FS_VINUM; 131 return (0); 132 } 133 alias = g_part_alias_name(G_PART_ALIAS_FREEBSD_ZFS); 134 if (!strcasecmp(type, alias)) { 135 *fstype = FS_ZFS; 136 return (0); 137 } 138 return (EINVAL); 139 } 140 141 static int 142 g_part_bsd_add(struct g_part_table *basetable, struct g_part_entry *baseentry, 143 struct g_part_parms *gpp) 144 { 145 struct g_part_bsd_entry *entry; 146 struct g_part_bsd_table *table; 147 148 if (gpp->gpp_parms & G_PART_PARM_LABEL) 149 return (EINVAL); 150 151 entry = (struct g_part_bsd_entry *)baseentry; 152 table = (struct g_part_bsd_table *)basetable; 153 154 entry->part.p_size = gpp->gpp_size; 155 entry->part.p_offset = gpp->gpp_start + table->offset; 156 entry->part.p_fsize = 0; 157 entry->part.p_frag = 0; 158 entry->part.p_cpg = 0; 159 return (bsd_parse_type(gpp->gpp_type, &entry->part.p_fstype)); 160 } 161 162 static int 163 g_part_bsd_bootcode(struct g_part_table *basetable, struct g_part_parms *gpp) 164 { 165 struct g_part_bsd_table *table; 166 const u_char *codeptr; 167 size_t hdsz, tlsz; 168 size_t codesz, tlofs; 169 170 hdsz = 512; 171 tlofs = hdsz + 148 + basetable->gpt_entries * 16; 172 tlsz = BBSIZE - tlofs; 173 table = (struct g_part_bsd_table *)basetable; 174 bzero(table->bbarea, hdsz); 175 bzero(table->bbarea + tlofs, tlsz); 176 codeptr = gpp->gpp_codeptr; 177 codesz = MIN(hdsz, gpp->gpp_codesize); 178 if (codesz > 0) 179 bcopy(codeptr, table->bbarea, codesz); 180 codesz = MIN(tlsz, gpp->gpp_codesize - tlofs); 181 if (codesz > 0) 182 bcopy(codeptr + tlofs, table->bbarea + tlofs, codesz); 183 return (0); 184 } 185 186 static int 187 g_part_bsd_create(struct g_part_table *basetable, struct g_part_parms *gpp) 188 { 189 struct g_consumer *cp; 190 struct g_provider *pp; 191 struct g_part_entry *baseentry; 192 struct g_part_bsd_entry *entry; 193 struct g_part_bsd_table *table; 194 u_char *ptr; 195 uint32_t msize, ncyls, secpercyl; 196 197 pp = gpp->gpp_provider; 198 cp = LIST_FIRST(&pp->consumers); 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, 0xffffffff); 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 { 242 243 /* Wipe the second sector to clear the partitioning. */ 244 basetable->gpt_smhead |= 2; 245 return (0); 246 } 247 248 static void 249 g_part_bsd_dumpconf(struct g_part_table *table, struct g_part_entry *baseentry, 250 struct sbuf *sb, const char *indent) 251 { 252 struct g_part_bsd_entry *entry; 253 254 entry = (struct g_part_bsd_entry *)baseentry; 255 if (indent == NULL) { 256 /* conftxt: libdisk compatibility */ 257 sbuf_printf(sb, " xs BSD xt %u", entry->part.p_fstype); 258 } else if (entry != NULL) { 259 /* confxml: partition entry information */ 260 sbuf_printf(sb, "%s<rawtype>%u</rawtype>\n", indent, 261 entry->part.p_fstype); 262 } else { 263 /* confxml: scheme information */ 264 } 265 } 266 267 static int 268 g_part_bsd_dumpto(struct g_part_table *table, struct g_part_entry *baseentry) 269 { 270 struct g_part_bsd_entry *entry; 271 272 /* Allow dumping to a swap partition or an unused partition. */ 273 entry = (struct g_part_bsd_entry *)baseentry; 274 return ((entry->part.p_fstype == FS_UNUSED || 275 entry->part.p_fstype == FS_SWAP) ? 1 : 0); 276 } 277 278 static int 279 g_part_bsd_modify(struct g_part_table *basetable, 280 struct g_part_entry *baseentry, struct g_part_parms *gpp) 281 { 282 struct g_part_bsd_entry *entry; 283 284 if (gpp->gpp_parms & G_PART_PARM_LABEL) 285 return (EINVAL); 286 287 entry = (struct g_part_bsd_entry *)baseentry; 288 if (gpp->gpp_parms & G_PART_PARM_TYPE) 289 return (bsd_parse_type(gpp->gpp_type, &entry->part.p_fstype)); 290 return (0); 291 } 292 293 static const char * 294 g_part_bsd_name(struct g_part_table *table, struct g_part_entry *baseentry, 295 char *buf, size_t bufsz) 296 { 297 298 snprintf(buf, bufsz, "%c", 'a' + baseentry->gpe_index - 1); 299 return (buf); 300 } 301 302 static int 303 g_part_bsd_probe(struct g_part_table *table, struct g_consumer *cp) 304 { 305 struct g_provider *pp; 306 u_char *buf; 307 uint32_t magic1, magic2; 308 int error; 309 310 pp = cp->provider; 311 312 /* Sanity-check the provider. */ 313 if (pp->sectorsize < sizeof(struct disklabel) || 314 pp->mediasize < BBSIZE) 315 return (ENOSPC); 316 if (BBSIZE % pp->sectorsize) 317 return (ENOTBLK); 318 319 /* Check that there's a disklabel. */ 320 buf = g_read_data(cp, pp->sectorsize, pp->sectorsize, &error); 321 if (buf == NULL) 322 return (error); 323 magic1 = le32dec(buf + 0); 324 magic2 = le32dec(buf + 132); 325 g_free(buf); 326 return ((magic1 == DISKMAGIC && magic2 == DISKMAGIC) 327 ? G_PART_PROBE_PRI_HIGH : ENXIO); 328 } 329 330 static int 331 g_part_bsd_read(struct g_part_table *basetable, struct g_consumer *cp) 332 { 333 struct g_provider *pp; 334 struct g_part_bsd_table *table; 335 struct g_part_entry *baseentry; 336 struct g_part_bsd_entry *entry; 337 struct partition part; 338 u_char *buf, *p; 339 off_t chs, msize; 340 u_int sectors, heads; 341 int error, index; 342 343 pp = cp->provider; 344 table = (struct g_part_bsd_table *)basetable; 345 msize = pp->mediasize / pp->sectorsize; 346 347 table->bbarea = g_read_data(cp, 0, BBSIZE, &error); 348 if (table->bbarea == NULL) 349 return (error); 350 351 buf = table->bbarea + pp->sectorsize; 352 353 if (le32dec(buf + 40) != pp->sectorsize) 354 goto invalid_label; 355 sectors = le32dec(buf + 44); 356 if (sectors < 1 || sectors > 255) 357 goto invalid_label; 358 if (sectors != basetable->gpt_sectors && !basetable->gpt_fixgeom) { 359 g_part_geometry_heads(msize, sectors, &chs, &heads); 360 if (chs != 0) { 361 basetable->gpt_sectors = sectors; 362 basetable->gpt_heads = heads; 363 } 364 } 365 heads = le32dec(buf + 48); 366 if (heads < 1 || heads > 255) 367 goto invalid_label; 368 if (heads != basetable->gpt_heads && !basetable->gpt_fixgeom) 369 basetable->gpt_heads = heads; 370 if (sectors != basetable->gpt_sectors || heads != basetable->gpt_heads) 371 printf("GEOM: %s: geometry does not match label" 372 " (%uh,%us != %uh,%us).\n", pp->name, heads, sectors, 373 basetable->gpt_heads, basetable->gpt_sectors); 374 375 chs = le32dec(buf + 60); 376 if (chs < 1) 377 goto invalid_label; 378 /* Fix-up a sysinstall bug. */ 379 if (chs > msize) { 380 chs = msize; 381 le32enc(buf + 60, msize); 382 } 383 if (chs != msize) 384 printf("GEOM: %s: media size does not match label.\n", 385 pp->name); 386 387 basetable->gpt_first = 0; 388 basetable->gpt_last = msize - 1; 389 basetable->gpt_isleaf = 1; 390 391 basetable->gpt_entries = le16dec(buf + 138); 392 if (basetable->gpt_entries < g_part_bsd_scheme.gps_minent || 393 basetable->gpt_entries > g_part_bsd_scheme.gps_maxent) 394 goto invalid_label; 395 396 table->offset = le32dec(buf + 148 + RAW_PART * 16 + 4); 397 for (index = basetable->gpt_entries - 1; index >= 0; index--) { 398 p = buf + 148 + index * 16; 399 part.p_size = le32dec(p + 0); 400 part.p_offset = le32dec(p + 4); 401 part.p_fsize = le32dec(p + 8); 402 part.p_fstype = p[12]; 403 part.p_frag = p[13]; 404 part.p_cpg = le16dec(p + 14); 405 if (part.p_size == 0) 406 continue; 407 if (part.p_offset < table->offset) 408 continue; 409 baseentry = g_part_new_entry(basetable, index + 1, 410 part.p_offset - table->offset, 411 part.p_offset - table->offset + part.p_size - 1); 412 entry = (struct g_part_bsd_entry *)baseentry; 413 entry->part = part; 414 if (index == RAW_PART) 415 baseentry->gpe_internal = 1; 416 } 417 418 return (0); 419 420 invalid_label: 421 printf("GEOM: %s: invalid disklabel.\n", pp->name); 422 g_free(table->bbarea); 423 return (EINVAL); 424 } 425 426 static const char * 427 g_part_bsd_type(struct g_part_table *basetable, struct g_part_entry *baseentry, 428 char *buf, size_t bufsz) 429 { 430 struct g_part_bsd_entry *entry; 431 int type; 432 433 entry = (struct g_part_bsd_entry *)baseentry; 434 type = entry->part.p_fstype; 435 if (type == FS_SWAP) 436 return (g_part_alias_name(G_PART_ALIAS_FREEBSD_SWAP)); 437 if (type == FS_BSDFFS) 438 return (g_part_alias_name(G_PART_ALIAS_FREEBSD_UFS)); 439 if (type == FS_VINUM) 440 return (g_part_alias_name(G_PART_ALIAS_FREEBSD_VINUM)); 441 if (type == FS_ZFS) 442 return (g_part_alias_name(G_PART_ALIAS_FREEBSD_ZFS)); 443 snprintf(buf, bufsz, "!%d", type); 444 return (buf); 445 } 446 447 static int 448 g_part_bsd_write(struct g_part_table *basetable, struct g_consumer *cp) 449 { 450 struct g_provider *pp; 451 struct g_part_entry *baseentry; 452 struct g_part_bsd_entry *entry; 453 struct g_part_bsd_table *table; 454 uint16_t sum; 455 u_char *label, *p, *pe; 456 int error, index; 457 458 pp = cp->provider; 459 table = (struct g_part_bsd_table *)basetable; 460 baseentry = LIST_FIRST(&basetable->gpt_entry); 461 label = table->bbarea + pp->sectorsize; 462 for (index = 1; index <= basetable->gpt_entries; index++) { 463 p = label + 148 + (index - 1) * 16; 464 entry = (baseentry != NULL && index == baseentry->gpe_index) 465 ? (struct g_part_bsd_entry *)baseentry : NULL; 466 if (entry != NULL && !baseentry->gpe_deleted) { 467 le32enc(p + 0, entry->part.p_size); 468 le32enc(p + 4, entry->part.p_offset); 469 le32enc(p + 8, entry->part.p_fsize); 470 p[12] = entry->part.p_fstype; 471 p[13] = entry->part.p_frag; 472 le16enc(p + 14, entry->part.p_cpg); 473 } else 474 bzero(p, 16); 475 476 if (entry != NULL) 477 baseentry = LIST_NEXT(baseentry, gpe_entry); 478 } 479 480 /* Calculate checksum. */ 481 le16enc(label + 136, 0); 482 pe = label + 148 + basetable->gpt_entries * 16; 483 sum = 0; 484 for (p = label; p < pe; p += 2) 485 sum ^= le16dec(p); 486 le16enc(label + 136, sum); 487 488 error = g_write_data(cp, 0, table->bbarea, BBSIZE); 489 return (error); 490 }
Cache object: ccac561af2dce7c7cd5d89d20c5acc37
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