g_part_bsd.c revision 174326
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 174326 2007-12-06 02:32:42Z 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 48struct g_part_bsd_table { 49 struct g_part_table base; 50 u_char *label; 51}; 52 53struct g_part_bsd_entry { 54 struct g_part_entry base; 55 struct partition part; 56}; 57 58static int g_part_bsd_add(struct g_part_table *, struct g_part_entry *, 59 struct g_part_parms *); 60static int g_part_bsd_create(struct g_part_table *, struct g_part_parms *); 61static int g_part_bsd_destroy(struct g_part_table *, struct g_part_parms *); 62static int g_part_bsd_dumpto(struct g_part_table *, struct g_part_entry *); 63static int g_part_bsd_modify(struct g_part_table *, struct g_part_entry *, 64 struct g_part_parms *); 65static char *g_part_bsd_name(struct g_part_table *, struct g_part_entry *, 66 char *, size_t); 67static int g_part_bsd_probe(struct g_part_table *, struct g_consumer *); 68static int g_part_bsd_read(struct g_part_table *, struct g_consumer *); 69static const char *g_part_bsd_type(struct g_part_table *, struct g_part_entry *, 70 char *, size_t); 71static int g_part_bsd_write(struct g_part_table *, struct g_consumer *); 72 73static kobj_method_t g_part_bsd_methods[] = { 74 KOBJMETHOD(g_part_add, g_part_bsd_add), 75 KOBJMETHOD(g_part_create, g_part_bsd_create), 76 KOBJMETHOD(g_part_destroy, g_part_bsd_destroy), 77 KOBJMETHOD(g_part_dumpto, g_part_bsd_dumpto), 78 KOBJMETHOD(g_part_modify, g_part_bsd_modify), 79 KOBJMETHOD(g_part_name, g_part_bsd_name), 80 KOBJMETHOD(g_part_probe, g_part_bsd_probe), 81 KOBJMETHOD(g_part_read, g_part_bsd_read), 82 KOBJMETHOD(g_part_type, g_part_bsd_type), 83 KOBJMETHOD(g_part_write, g_part_bsd_write), 84 { 0, 0 } 85}; 86 87static struct g_part_scheme g_part_bsd_scheme = { 88 "BSD", 89 g_part_bsd_methods, 90 sizeof(struct g_part_bsd_table), 91 .gps_entrysz = sizeof(struct g_part_bsd_entry), 92 .gps_minent = 8, 93 .gps_maxent = 20, 94}; 95G_PART_SCHEME_DECLARE(g_part_bsd_scheme); 96 97static int 98bsd_parse_type(const char *type, uint8_t *fstype) 99{ 100 const char *alias; 101 char *endp; 102 long lt; 103 104 if (type[0] == '!') { 105 lt = strtol(type + 1, &endp, 0); 106 if (type[1] == '\0' || *endp != '\0' || lt <= 0 || lt >= 256) 107 return (EINVAL); 108 *fstype = (u_int)lt; 109 return (0); 110 } 111 alias = g_part_alias_name(G_PART_ALIAS_FREEBSD_SWAP); 112 if (!strcasecmp(type, alias)) { 113 *fstype = FS_SWAP; 114 return (0); 115 } 116 alias = g_part_alias_name(G_PART_ALIAS_FREEBSD_UFS); 117 if (!strcasecmp(type, alias)) { 118 *fstype = FS_BSDFFS; 119 return (0); 120 } 121 alias = g_part_alias_name(G_PART_ALIAS_FREEBSD_VINUM); 122 if (!strcasecmp(type, alias)) { 123 *fstype = FS_VINUM; 124 return (0); 125 } 126 return (EINVAL); 127} 128 129static int 130g_part_bsd_add(struct g_part_table *basetable, struct g_part_entry *baseentry, 131 struct g_part_parms *gpp) 132{ 133 struct g_part_bsd_entry *entry; 134 struct g_part_bsd_table *table; 135 uint32_t start, size, sectors; 136 137 if (gpp->gpp_parms & G_PART_PARM_LABEL) 138 return (EINVAL); 139 140 sectors = basetable->gpt_sectors; 141 142 entry = (struct g_part_bsd_entry *)baseentry; 143 table = (struct g_part_bsd_table *)basetable; 144 145 start = gpp->gpp_start; 146 size = gpp->gpp_size; 147 if (size < sectors) 148 return (EINVAL); 149 if (start % sectors) { 150 size = size - sectors + (start % sectors); 151 start = start - (start % sectors) + sectors; 152 } 153 if (size % sectors) 154 size = size - (size % sectors); 155 if (size < sectors) 156 return (EINVAL); 157 158 KASSERT(baseentry->gpe_start <= start, (__func__)); 159 KASSERT(baseentry->gpe_end >= start + size - 1, (__func__)); 160 baseentry->gpe_start = start; 161 baseentry->gpe_end = start + size - 1; 162 entry->part.p_size = size; 163 entry->part.p_offset = start + basetable->gpt_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 170static int 171g_part_bsd_create(struct g_part_table *basetable, struct g_part_parms *gpp) 172{ 173 struct g_consumer *cp; 174 struct g_provider *pp; 175 struct g_part_entry *baseentry; 176 struct g_part_bsd_entry *entry; 177 struct g_part_bsd_table *table; 178 u_char *ptr; 179 uint64_t msize; 180 uint32_t ncyls, secpercyl; 181 182 pp = gpp->gpp_provider; 183 cp = LIST_FIRST(&pp->consumers); 184 185 if (pp->sectorsize < sizeof(struct disklabel)) 186 return (ENOSPC); 187 188 msize = pp->mediasize / pp->sectorsize; 189 secpercyl = basetable->gpt_sectors * basetable->gpt_heads; 190 ncyls = msize / secpercyl; 191 192 table = (struct g_part_bsd_table *)basetable; 193 ptr = table->label = g_malloc(pp->sectorsize, M_WAITOK | M_ZERO); 194 195 le32enc(ptr + 0, DISKMAGIC); /* d_magic */ 196 le32enc(ptr + 40, pp->sectorsize); /* d_secsize */ 197 le32enc(ptr + 44, basetable->gpt_sectors); /* d_nsectors */ 198 le32enc(ptr + 48, basetable->gpt_heads); /* d_ntracks */ 199 le32enc(ptr + 52, ncyls); /* d_ncylinders */ 200 le32enc(ptr + 56, secpercyl); /* d_secpercyl */ 201 le32enc(ptr + 60, ncyls * secpercyl); /* d_secperunit */ 202 le16enc(ptr + 72, 3600); /* d_rpm */ 203 le32enc(ptr + 132, DISKMAGIC); /* d_magic2 */ 204 le16enc(ptr + 138, basetable->gpt_entries); /* d_npartitions */ 205 le32enc(ptr + 140, BBSIZE); /* d_bbsize */ 206 207 basetable->gpt_first = 0; 208 basetable->gpt_last = ncyls * secpercyl - 1; 209 basetable->gpt_isleaf = 1; 210 211 baseentry = g_part_new_entry(basetable, RAW_PART + 1, 212 basetable->gpt_first, basetable->gpt_last); 213 baseentry->gpe_internal = 1; 214 entry = (struct g_part_bsd_entry *)baseentry; 215 entry->part.p_size = basetable->gpt_last + 1; 216 entry->part.p_offset = basetable->gpt_offset; 217 218 return (0); 219} 220 221static int 222g_part_bsd_destroy(struct g_part_table *basetable, struct g_part_parms *gpp) 223{ 224 225 /* Wipe the second sector to clear the partitioning. */ 226 basetable->gpt_smhead |= 2; 227 return (0); 228} 229 230static int 231g_part_bsd_dumpto(struct g_part_table *table, struct g_part_entry *baseentry) 232{ 233 struct g_part_bsd_entry *entry; 234 235 /* Allow dumping to a swap partition only. */ 236 entry = (struct g_part_bsd_entry *)baseentry; 237 return ((entry->part.p_fstype == FS_SWAP) ? 1 : 0); 238} 239 240static int 241g_part_bsd_modify(struct g_part_table *basetable, 242 struct g_part_entry *baseentry, struct g_part_parms *gpp) 243{ 244 struct g_part_bsd_entry *entry; 245 246 if (gpp->gpp_parms & G_PART_PARM_LABEL) 247 return (EINVAL); 248 249 entry = (struct g_part_bsd_entry *)baseentry; 250 if (gpp->gpp_parms & G_PART_PARM_TYPE) 251 return (bsd_parse_type(gpp->gpp_type, &entry->part.p_fstype)); 252 return (0); 253} 254 255static char * 256g_part_bsd_name(struct g_part_table *table, struct g_part_entry *baseentry, 257 char *buf, size_t bufsz) 258{ 259 260 snprintf(buf, bufsz, "%c", 'a' + baseentry->gpe_index - 1); 261 return (buf); 262} 263 264static int 265g_part_bsd_probe(struct g_part_table *table, struct g_consumer *cp) 266{ 267 struct g_provider *pp; 268 u_char *buf; 269 uint32_t magic1, magic2; 270 int error; 271 272 pp = cp->provider; 273 274 /* Sanity-check the provider. */ 275 if (pp->sectorsize < sizeof(struct disklabel) || 276 pp->mediasize < BBSIZE) 277 return (ENOSPC); 278 279 /* Check that there's a disklabel. */ 280 buf = g_read_data(cp, pp->sectorsize, pp->sectorsize, &error); 281 if (buf == NULL) 282 return (error); 283 magic1 = le32dec(buf + 0); 284 magic2 = le32dec(buf + 132); 285 g_free(buf); 286 return ((magic1 == DISKMAGIC && magic2 == DISKMAGIC) 287 ? G_PART_PROBE_PRI_NORM : ENXIO); 288} 289 290static int 291g_part_bsd_read(struct g_part_table *basetable, struct g_consumer *cp) 292{ 293 struct g_provider *pp; 294 struct g_part_bsd_table *table; 295 struct g_part_entry *baseentry; 296 struct g_part_bsd_entry *entry; 297 struct partition part; 298 u_char *buf, *p; 299 off_t chs, msize; 300 u_int sectors, heads; 301 int error, index; 302 303 pp = cp->provider; 304 table = (struct g_part_bsd_table *)basetable; 305 msize = pp->mediasize / pp->sectorsize; 306 307 buf = g_read_data(cp, pp->sectorsize, pp->sectorsize, &error); 308 if (buf == NULL) 309 return (error); 310 311 table->label = buf; 312 313 if (le32dec(buf + 40) != pp->sectorsize) 314 goto invalid_label; 315 sectors = le32dec(buf + 44); 316 if (sectors < 1 || sectors > 63) 317 goto invalid_label; 318 if (sectors != basetable->gpt_sectors) { 319 if (basetable->gpt_fixgeom) 320 goto invalid_label; 321 g_part_geometry_heads(msize, sectors, &chs, &heads); 322 if (chs == 0) 323 goto invalid_label; 324 basetable->gpt_sectors = sectors; 325 basetable->gpt_heads = heads; 326 } 327 heads = le32dec(buf + 48); 328 if (heads < 1 || heads > 255) 329 goto invalid_label; 330 if (heads != basetable->gpt_heads) { 331 if (basetable->gpt_fixgeom) 332 goto invalid_label; 333 basetable->gpt_heads = heads; 334 } 335 chs = le32dec(buf + 52) * heads * sectors; 336 if (chs < 1 || chs > msize) 337 goto invalid_label; 338 339 basetable->gpt_first = 0; 340 basetable->gpt_last = chs - 1; 341 basetable->gpt_isleaf = 1; 342 343 basetable->gpt_entries = le16dec(buf + 138); 344 if (basetable->gpt_entries < g_part_bsd_scheme.gps_minent || 345 basetable->gpt_entries > g_part_bsd_scheme.gps_maxent) 346 goto invalid_label; 347 348 for (index = basetable->gpt_entries - 1; index >= 0; index--) { 349 p = buf + 148 + index * 16; 350 part.p_size = le32dec(p + 0); 351 part.p_offset = le32dec(p + 4); 352 part.p_fsize = le32dec(p + 8); 353 part.p_fstype = p[12]; 354 part.p_frag = p[13]; 355 part.p_cpg = le16dec(p + 14); 356 if (part.p_size == 0) 357 continue; 358 if (part.p_fstype == FS_UNUSED && index != RAW_PART) 359 continue; 360 if (part.p_offset < basetable->gpt_offset) 361 continue; 362 baseentry = g_part_new_entry(basetable, index + 1, 363 part.p_offset - basetable->gpt_offset, 364 part.p_offset - basetable->gpt_offset + part.p_size - 1); 365 entry = (struct g_part_bsd_entry *)baseentry; 366 entry->part = part; 367 if (part.p_fstype == FS_UNUSED) 368 baseentry->gpe_internal = 1; 369 } 370 371 return (0); 372 373 invalid_label: 374 printf("GEOM: %s: invalid disklabel.\n", pp->name); 375 g_free(table->label); 376 return (EINVAL); 377} 378 379static const char * 380g_part_bsd_type(struct g_part_table *basetable, struct g_part_entry *baseentry, 381 char *buf, size_t bufsz) 382{ 383 struct g_part_bsd_entry *entry; 384 int type; 385 386 entry = (struct g_part_bsd_entry *)baseentry; 387 type = entry->part.p_fstype; 388 if (type == FS_SWAP) 389 return (g_part_alias_name(G_PART_ALIAS_FREEBSD_SWAP)); 390 if (type == FS_BSDFFS) 391 return (g_part_alias_name(G_PART_ALIAS_FREEBSD_UFS)); 392 if (type == FS_VINUM) 393 return (g_part_alias_name(G_PART_ALIAS_FREEBSD_VINUM)); 394 snprintf(buf, bufsz, "!%d", type); 395 return (buf); 396} 397 398static int 399g_part_bsd_write(struct g_part_table *basetable, struct g_consumer *cp) 400{ 401 struct g_provider *pp; 402 struct g_part_entry *baseentry; 403 struct g_part_bsd_entry *entry; 404 struct g_part_bsd_table *table; 405 uint16_t sum; 406 u_char *p, *pe; 407 int error, index; 408 409 pp = cp->provider; 410 table = (struct g_part_bsd_table *)basetable; 411 baseentry = LIST_FIRST(&basetable->gpt_entry); 412 for (index = 1; index <= basetable->gpt_entries; index++) { 413 p = table->label + 148 + (index - 1) * 16; 414 entry = (baseentry != NULL && index == baseentry->gpe_index) 415 ? (struct g_part_bsd_entry *)baseentry : NULL; 416 if (entry != NULL && !baseentry->gpe_deleted) { 417 le32enc(p + 0, entry->part.p_size); 418 le32enc(p + 4, entry->part.p_offset); 419 le32enc(p + 8, entry->part.p_fsize); 420 p[12] = entry->part.p_fstype; 421 p[13] = entry->part.p_frag; 422 le16enc(p + 14, entry->part.p_cpg); 423 } else 424 bzero(p, 16); 425 426 if (entry != NULL) 427 baseentry = LIST_NEXT(baseentry, gpe_entry); 428 } 429 430 /* Calculate checksum. */ 431 le16enc(table->label + 136, 0); 432 pe = table->label + 148 + basetable->gpt_entries * 16; 433 sum = 0; 434 for (p = table->label; p < pe; p += 2) 435 sum ^= le16dec(p); 436 le16enc(table->label + 136, sum); 437 438 error = g_write_data(cp, pp->sectorsize, table->label, pp->sectorsize); 439 return (error); 440} 441