dkwedge_bsdlabel.c revision 1.14
1 /* $NetBSD: dkwedge_bsdlabel.c,v 1.14 2007/06/09 02:10:30 dyoung Exp $ */ 2 3 /*- 4 * Copyright (c) 2004 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 /* 40 * Adapted from kern/subr_disk_mbr.c: 41 * 42 * Copyright (c) 1982, 1986, 1988 Regents of the University of California. 43 * All rights reserved. 44 * 45 * Redistribution and use in source and binary forms, with or without 46 * modification, are permitted provided that the following conditions 47 * are met: 48 * 1. Redistributions of source code must retain the above copyright 49 * notice, this list of conditions and the following disclaimer. 50 * 2. Redistributions in binary form must reproduce the above copyright 51 * notice, this list of conditions and the following disclaimer in the 52 * documentation and/or other materials provided with the distribution. 53 * 3. Neither the name of the University nor the names of its contributors 54 * may be used to endorse or promote products derived from this software 55 * without specific prior written permission. 56 * 57 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 58 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 59 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 60 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 61 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 62 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 63 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 64 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 65 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 66 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 67 * SUCH DAMAGE. 68 * 69 * @(#)ufs_disksubr.c 7.16 (Berkeley) 5/4/91 70 */ 71 72 /* 73 * 4.4BSD disklabel support for disk wedges 74 * 75 * Here is the basic search algorithm in use here: 76 * 77 * For historical reasons, we scan for x86-style MBR partitions looking 78 * for a MBR_PTYPE_NETBSD (or MBR_PTYPE_386BSD) partition. The first 79 * 4.4BSD disklabel found in the 2nd sector of such a partition is used. 80 * We assume that the 4.4BSD disklabel describes all partitions on the 81 * disk; we do not use any partition information from the MBR partition 82 * table. 83 * 84 * If that fails, then we fall back on a table of known locations for 85 * various platforms. 86 */ 87 88 #include <sys/cdefs.h> 89 __KERNEL_RCSID(0, "$NetBSD: dkwedge_bsdlabel.c,v 1.14 2007/06/09 02:10:30 dyoung Exp $"); 90 91 #include <sys/param.h> 92 #ifdef _KERNEL 93 #include <sys/systm.h> 94 #endif 95 #include <sys/proc.h> 96 #include <sys/errno.h> 97 #include <sys/disk.h> 98 #include <sys/vnode.h> 99 #include <sys/malloc.h> 100 101 #include <sys/bootblock.h> 102 #include <sys/disklabel.h> 103 104 #define BSD44_MBR_LABELSECTOR 1 105 106 #define DISKLABEL_SIZE(x) \ 107 (offsetof(struct disklabel, d_partitions) + \ 108 (sizeof(struct partition) * (x))) 109 110 /* 111 * Note the smallest MAXPARTITIONS was 8, so we allow a disklabel 112 * that size to be locted at the end of the sector. 113 */ 114 #define DISKLABEL_MINSIZE DISKLABEL_SIZE(8) 115 116 /* 117 * Table of known platform-specific disklabel locations. 118 */ 119 static const struct disklabel_location { 120 daddr_t label_sector; /* sector containing label */ 121 size_t label_offset; /* byte offset of label in sector */ 122 } disklabel_locations[] = { 123 { 0, 0 }, /* mvme68k, next68k */ 124 { 0, 64 }, /* algor, alpha, amiga, amigappc, evbmips, evbppc, 125 luna68k, mac68k, macppc, news68k, newsmips, 126 pc532, pdp11, pmax, vax, x68k */ 127 { 0, 128 }, /* sparc, sun68k */ 128 { 1, 0 }, /* amd64, arc, arm, bebox, cobalt, evbppc, hp700, 129 hpcarm, hpcmips, i386, ibmnws, mipsco, mvmeppc, 130 ofppc, playstation2, pmppc, prep, sandpoint, 131 sbmips, sgimips, sh3 */ 132 /* XXX atari is weird */ 133 { 2, 0 }, /* cesfic, hp300 */ 134 135 { -1, 0 }, 136 }; 137 138 #define SCAN_CONTINUE 0 139 #define SCAN_FOUND 1 140 #define SCAN_ERROR 2 141 142 typedef struct mbr_args { 143 struct disk *pdk; 144 struct vnode *vp; 145 void *buf; 146 int error; 147 } mbr_args_t; 148 149 static const char * 150 bsdlabel_fstype_to_str(uint8_t fstype) 151 { 152 const char *str; 153 154 switch (fstype) { 155 case FS_UNUSED: str = DKW_PTYPE_UNUSED; break; 156 case FS_SWAP: str = DKW_PTYPE_SWAP; break; 157 case FS_BSDFFS: str = DKW_PTYPE_FFS; break; 158 case FS_MSDOS: str = DKW_PTYPE_FAT; break; 159 case FS_BSDLFS: str = DKW_PTYPE_LFS; break; 160 case FS_ISO9660: str = DKW_PTYPE_ISO9660; break; 161 case FS_ADOS: str = DKW_PTYPE_AMIGADOS; break; 162 case FS_HFS: str = DKW_PTYPE_APPLEHFS; break; 163 case FS_FILECORE: str = DKW_PTYPE_FILECORE; break; 164 case FS_EX2FS: str = DKW_PTYPE_EXT2FS; break; 165 case FS_NTFS: str = DKW_PTYPE_NTFS; break; 166 case FS_RAID: str = DKW_PTYPE_RAIDFRAME; break; 167 case FS_CCD: str = DKW_PTYPE_CCD; break; 168 case FS_APPLEUFS: str = DKW_PTYPE_APPLEUFS; break; 169 default: str = NULL; break; 170 } 171 172 return (str); 173 } 174 175 static void 176 swap_disklabel(struct disklabel *lp) 177 { 178 int i; 179 180 #define SWAP16(x) lp->x = bswap16(lp->x) 181 #define SWAP32(x) lp->x = bswap32(lp->x) 182 183 SWAP32(d_magic); 184 SWAP16(d_type); 185 SWAP16(d_subtype); 186 SWAP32(d_secsize); 187 SWAP32(d_nsectors); 188 SWAP32(d_ntracks); 189 SWAP32(d_ncylinders); 190 SWAP32(d_secpercyl); 191 SWAP32(d_secperunit); 192 SWAP16(d_sparespertrack); 193 SWAP16(d_sparespercyl); 194 SWAP32(d_acylinders); 195 SWAP16(d_rpm); 196 SWAP16(d_interleave); 197 SWAP16(d_trackskew); 198 SWAP16(d_cylskew); 199 SWAP32(d_headswitch); 200 SWAP32(d_trkseek); 201 SWAP32(d_flags); 202 203 for (i = 0; i < NDDATA; i++) 204 SWAP32(d_drivedata[i]); 205 for (i = 0; i < NSPARE; i++) 206 SWAP32(d_spare[i]); 207 208 SWAP32(d_magic2); 209 SWAP16(d_checksum); 210 SWAP16(d_npartitions); 211 SWAP32(d_bbsize); 212 SWAP32(d_sbsize); 213 214 for (i = 0; i < lp->d_npartitions; i++) { 215 SWAP32(d_partitions[i].p_size); 216 SWAP32(d_partitions[i].p_offset); 217 SWAP32(d_partitions[i].p_fsize); 218 SWAP16(d_partitions[i].p_cpg); 219 } 220 221 #undef SWAP16 222 #undef SWAP32 223 } 224 225 /* 226 * Add wedges for a valid NetBSD disklabel. 227 */ 228 static void 229 addwedges(const mbr_args_t *a, const struct disklabel *lp) 230 { 231 int error, i; 232 233 for (i = 0; i < lp->d_npartitions; i++) { 234 struct dkwedge_info dkw; 235 const struct partition *p; 236 const char *ptype; 237 238 p = &lp->d_partitions[i]; 239 240 if (p->p_fstype == FS_UNUSED) 241 continue; 242 if ((ptype = bsdlabel_fstype_to_str(p->p_fstype)) == NULL) { 243 /* 244 * XXX Should probably just add these... 245 * XXX maybe just have an empty ptype? 246 */ 247 aprint_verbose("%s: skipping partition %d, type %d\n", 248 a->pdk->dk_name, i, p->p_fstype); 249 continue; 250 } 251 strcpy(dkw.dkw_ptype, ptype); 252 253 strcpy(dkw.dkw_parent, a->pdk->dk_name); 254 dkw.dkw_offset = p->p_offset; 255 dkw.dkw_size = p->p_size; 256 257 /* 258 * These get historical disk naming style 259 * wedge names. 260 */ 261 snprintf((char *)&dkw.dkw_wname, sizeof(dkw.dkw_wname), 262 "%s%c", a->pdk->dk_name, 'a' + i); 263 264 error = dkwedge_add(&dkw); 265 if (error == EEXIST) 266 aprint_error("%s: wedge named '%s' already " 267 "exists, manual intervention required\n", 268 a->pdk->dk_name, dkw.dkw_wname); 269 else if (error) 270 aprint_error("%s: error %d adding partition " 271 "%d type %d\n", a->pdk->dk_name, error, 272 i, p->p_fstype); 273 } 274 } 275 276 static int 277 validate_label(mbr_args_t *a, daddr_t label_sector, size_t label_offset) 278 { 279 struct disklabel *lp; 280 void *lp_lim; 281 int error, swapped; 282 uint16_t npartitions; 283 284 error = dkwedge_read(a->pdk, a->vp, label_sector, a->buf, DEV_BSIZE); 285 if (error) { 286 aprint_error("%s: unable to read BSD disklabel @ %" PRId64 287 ", error = %d\n", a->pdk->dk_name, label_sector, error); 288 a->error = error; 289 return (SCAN_ERROR); 290 } 291 292 /* 293 * We ignore label_offset; this seems to have not been used 294 * consistently in the old code, requiring us to do the search 295 * in the sector. 296 */ 297 lp = a->buf; 298 lp_lim = (char *)a->buf + DEV_BSIZE - DISKLABEL_MINSIZE; 299 for (;; lp = (void *)((char *)lp + sizeof(uint32_t))) { 300 if ((char *)lp > (char *)lp_lim) 301 return (SCAN_CONTINUE); 302 label_offset = (size_t)((char *)lp - (char *)a->buf); 303 if (lp->d_magic != DISKMAGIC || lp->d_magic2 != DISKMAGIC) { 304 if (lp->d_magic != bswap32(DISKMAGIC) || 305 lp->d_magic2 != bswap32(DISKMAGIC)) 306 continue; 307 /* Label is in the other byte order. */ 308 swapped = 1; 309 } else 310 swapped = 0; 311 312 npartitions = (swapped) ? bswap16(lp->d_npartitions) 313 : lp->d_npartitions; 314 315 /* Validate label length. */ 316 if ((char *)lp + DISKLABEL_SIZE(npartitions) > 317 (char *)a->buf + DEV_BSIZE) { 318 aprint_error("%s: BSD disklabel @ " 319 "%" PRId64 "+%zd has bogus partition count (%u)\n", 320 a->pdk->dk_name, label_sector, label_offset, 321 npartitions); 322 continue; 323 } 324 325 /* 326 * We have validated the partition count. Checksum it. 327 * Note that we purposefully checksum before swapping 328 * the byte order. 329 */ 330 if (dkcksum_sized(lp, npartitions) != 0) { 331 aprint_error("%s: BSD disklabel @ %" PRId64 332 "+%zd has bad checksum\n", a->pdk->dk_name, 333 label_sector, label_offset); 334 continue; 335 } 336 /* Put the disklabel in the right order. */ 337 if (swapped) 338 swap_disklabel(lp); 339 addwedges(a, lp); 340 return (SCAN_FOUND); 341 } 342 } 343 344 static int 345 scan_mbr(mbr_args_t *a, int (*actn)(mbr_args_t *, struct mbr_partition *, 346 int, u_int)) 347 { 348 struct mbr_partition ptns[MBR_PART_COUNT]; 349 struct mbr_partition *dp; 350 struct mbr_sector *mbr; 351 u_int ext_base, this_ext, next_ext; 352 int i, rval; 353 #ifdef COMPAT_386BSD_MBRPART 354 int dp_386bsd = -1; 355 #endif 356 357 ext_base = 0; 358 this_ext = 0; 359 for (;;) { 360 a->error = dkwedge_read(a->pdk, a->vp, this_ext, a->buf, 361 DEV_BSIZE); 362 if (a->error) { 363 aprint_error("%s: unable to read MBR @ %u, " 364 "error = %d\n", a->pdk->dk_name, this_ext, 365 a->error); 366 return (SCAN_ERROR); 367 } 368 369 mbr = a->buf; 370 if (mbr->mbr_magic != htole16(MBR_MAGIC)) 371 return (SCAN_CONTINUE); 372 373 /* Copy data out of buffer so action can use the buffer. */ 374 memcpy(ptns, &mbr->mbr_parts, sizeof(ptns)); 375 376 /* Looks for NetBSD partition. */ 377 next_ext = 0; 378 dp = ptns; 379 for (i = 0; i < MBR_PART_COUNT; i++, dp++) { 380 if (dp->mbrp_type == 0) 381 continue; 382 if (MBR_IS_EXTENDED(dp->mbrp_type)) { 383 next_ext = le32toh(dp->mbrp_start); 384 continue; 385 } 386 #ifdef COMPAT_386BSD_MBRPART 387 if (dp->mbrp_type == MBR_PTYPE_386BSD) { 388 /* 389 * If more than one matches, take last, 390 * as NetBSD install tool does. 391 */ 392 if (this_ext == 0) 393 dp_386bsd = i; 394 continue; 395 } 396 #endif 397 rval = (*actn)(a, dp, i, this_ext); 398 if (rval != SCAN_CONTINUE) 399 return (rval); 400 } 401 if (next_ext == 0) 402 break; 403 if (ext_base == 0) { 404 ext_base = next_ext; 405 next_ext = 0; 406 } 407 next_ext += ext_base; 408 if (next_ext <= this_ext) 409 break; 410 this_ext = next_ext; 411 } 412 #ifdef COMPAT_386BSD_MBRPART 413 if (this_ext == 0 && dp_386bsd != -1) 414 return ((*actn)(a, &ptns[dp_386bsd], dp_386bsd, 0)); 415 #endif 416 return (SCAN_CONTINUE); 417 } 418 419 static int 420 look_netbsd_part(mbr_args_t *a, struct mbr_partition *dp, int slot, 421 u_int ext_base) 422 { 423 int ptn_base = ext_base + le32toh(dp->mbrp_start); 424 int rval; 425 426 if ( 427 #ifdef COMPAT_386BSD_MBRPART 428 dp->mbrp_type == MBR_PTYPE_386BSD || 429 #endif 430 dp->mbrp_type == MBR_PTYPE_NETBSD) { 431 rval = validate_label(a, ptn_base + BSD44_MBR_LABELSECTOR, 0); 432 433 /* If we got a NetBSD label, look no further. */ 434 if (rval == SCAN_FOUND) 435 return (rval); 436 } 437 438 return (SCAN_CONTINUE); 439 } 440 441 #ifdef _KERNEL 442 #define DKW_MALLOC(SZ) malloc((SZ), M_DEVBUF, M_WAITOK) 443 #define DKW_FREE(PTR) free((PTR), M_DEVBUF) 444 #else 445 #define DKW_MALLOC(SZ) malloc((SZ)) 446 #define DKW_FREE(PTR) free((PTR)) 447 #endif 448 449 static int 450 dkwedge_discover_bsdlabel(struct disk *pdk, struct vnode *vp) 451 { 452 mbr_args_t a; 453 const struct disklabel_location *dl; 454 int rval; 455 456 a.pdk = pdk; 457 a.vp = vp; 458 a.buf = DKW_MALLOC(DEV_BSIZE); 459 a.error = 0; 460 461 /* MBR search. */ 462 rval = scan_mbr(&a, look_netbsd_part); 463 if (rval != SCAN_CONTINUE) { 464 if (rval == SCAN_FOUND) 465 a.error = 0; /* found it, wedges installed */ 466 goto out; 467 } 468 469 /* Known location search. */ 470 for (dl = disklabel_locations; dl->label_sector != -1; dl++) { 471 rval = validate_label(&a, dl->label_sector, dl->label_offset); 472 if (rval != SCAN_CONTINUE) { 473 if (rval == SCAN_FOUND) 474 a.error = 0; /* found it, wedges installed */ 475 goto out; 476 } 477 } 478 479 /* No NetBSD disklabel found. */ 480 a.error = ESRCH; 481 out: 482 DKW_FREE(a.buf); 483 return (a.error); 484 } 485 486 #ifdef _KERNEL 487 DKWEDGE_DISCOVERY_METHOD_DECL(BSD44, 5, dkwedge_discover_bsdlabel); 488 #endif 489
Indexes created Mon Sep 29 21:09:56 GMT 2025