dkwedge_bsdlabel.c revision 1.10
1 /* $NetBSD: dkwedge_bsdlabel.c,v 1.10 2007/03/01 21:30:50 martin 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 1.10 2007/03/01 21:30:50 martin Exp $"); 90 91 #include <sys/param.h> 92 #include <sys/systm.h> 93 #include <sys/proc.h> 94 #include <sys/errno.h> 95 #include <sys/disk.h> 96 #include <sys/vnode.h> 97 #include <sys/malloc.h> 98 99 #include <sys/bootblock.h> 100 #include <sys/disklabel.h> 101 102 #define BSD44_MBR_LABELSECTOR 1 103 104 #define DISKLABEL_SIZE(x) \ 105 (offsetof(struct disklabel, d_partitions) + \ 106 (sizeof(struct partition) * (x))) 107 108 /* 109 * Note the smallest MAXPARTITIONS was 8, so we allow a disklabel 110 * that size to be locted at the end of the sector. 111 */ 112 #define DISKLABEL_MINSIZE DISKLABEL_SIZE(8) 113 114 /* 115 * Table of known platform-specific disklabel locations. 116 */ 117 static const struct disklabel_location { 118 daddr_t label_sector; /* sector containing label */ 119 size_t label_offset; /* byte offset of label in sector */ 120 } disklabel_locations[] = { 121 { 0, 0 }, /* mvme68k, next68k */ 122 { 0, 64 }, /* algor, alpha, amiga, amigappc, evbmips, evbppc, 123 luna68k, mac68k, macppc, news68k, newsmips, 124 pc532, pdp11, pmax, vax, x68k */ 125 { 0, 128 }, /* sparc, sun68k */ 126 { 1, 0 }, /* amd64, arc, arm, bebox, cobalt, evbppc, hp700, 127 hpcarm, hpcmips, i386, ibmnws, mipsco, mvmeppc, 128 ofppc, playstation2, pmppc, prep, sandpoint, 129 sbmips, sgimips, sh3, sh5 */ 130 /* XXX atari is weird */ 131 { 2, 0 }, /* cesfic, hp300 */ 132 133 { -1, 0 }, 134 }; 135 136 #define SCAN_CONTINUE 0 137 #define SCAN_FOUND 1 138 #define SCAN_ERROR 2 139 140 typedef struct mbr_args { 141 struct disk *pdk; 142 struct vnode *vp; 143 void *buf; 144 int error; 145 } mbr_args_t; 146 147 static const char * 148 bsdlabel_fstype_to_str(uint8_t fstype) 149 { 150 const char *str; 151 152 switch (fstype) { 153 case FS_UNUSED: str = DKW_PTYPE_UNUSED; break; 154 case FS_SWAP: str = DKW_PTYPE_SWAP; break; 155 case FS_BSDFFS: str = DKW_PTYPE_FFS; break; 156 case FS_MSDOS: str = DKW_PTYPE_FAT; break; 157 case FS_BSDLFS: str = DKW_PTYPE_LFS; break; 158 case FS_ISO9660: str = DKW_PTYPE_ISO9660; break; 159 case FS_ADOS: str = DKW_PTYPE_AMIGADOS; break; 160 case FS_HFS: str = DKW_PTYPE_APPLEHFS; break; 161 case FS_FILECORE: str = DKW_PTYPE_FILECORE; break; 162 case FS_EX2FS: str = DKW_PTYPE_EXT2FS; break; 163 case FS_NTFS: str = DKW_PTYPE_NTFS; break; 164 case FS_RAID: str = DKW_PTYPE_RAIDFRAME; break; 165 case FS_CCD: str = DKW_PTYPE_CCD; break; 166 case FS_APPLEUFS: str = DKW_PTYPE_APPLEUFS; break; 167 default: str = NULL; break; 168 } 169 170 return (str); 171 } 172 173 static void 174 swap_disklabel(struct disklabel *lp) 175 { 176 int i; 177 178 #define SWAP16(x) lp->x = bswap16(lp->x) 179 #define SWAP32(x) lp->x = bswap32(lp->x) 180 181 SWAP32(d_magic); 182 SWAP16(d_type); 183 SWAP16(d_subtype); 184 SWAP32(d_secsize); 185 SWAP32(d_nsectors); 186 SWAP32(d_ntracks); 187 SWAP32(d_ncylinders); 188 SWAP32(d_secpercyl); 189 SWAP32(d_secperunit); 190 SWAP16(d_sparespertrack); 191 SWAP16(d_sparespercyl); 192 SWAP32(d_acylinders); 193 SWAP16(d_rpm); 194 SWAP16(d_interleave); 195 SWAP16(d_trackskew); 196 SWAP16(d_cylskew); 197 SWAP32(d_headswitch); 198 SWAP32(d_trkseek); 199 SWAP32(d_flags); 200 201 for (i = 0; i < NDDATA; i++) 202 SWAP32(d_drivedata[i]); 203 for (i = 0; i < NSPARE; i++) 204 SWAP32(d_spare[i]); 205 206 SWAP32(d_magic2); 207 SWAP16(d_checksum); 208 SWAP16(d_npartitions); 209 SWAP32(d_bbsize); 210 SWAP32(d_sbsize); 211 212 for (i = 0; i < lp->d_npartitions; i++) { 213 SWAP32(d_partitions[i].p_size); 214 SWAP32(d_partitions[i].p_offset); 215 SWAP32(d_partitions[i].p_fsize); 216 SWAP16(d_partitions[i].p_cpg); 217 } 218 219 #undef SWAP16 220 #undef SWAP32 221 } 222 223 static int 224 validate_label(mbr_args_t *a, daddr_t label_sector, size_t label_offset) 225 { 226 struct disklabel *lp; 227 caddr_t lp_lim; 228 int i, error; 229 u_int checksum; 230 231 error = dkwedge_read(a->pdk, a->vp, label_sector, a->buf, DEV_BSIZE); 232 if (error) { 233 aprint_error("%s: unable to read BSD disklabel @ %" PRId64 234 ", error = %d\n", a->pdk->dk_name, label_sector, error); 235 a->error = error; 236 return (SCAN_ERROR); 237 } 238 239 /* 240 * We ignore label_offset; this seems to have not been used 241 * consistently in the old code, requiring us to do the search 242 * in the sector. 243 */ 244 lp = a->buf; 245 lp_lim = (caddr_t)a->buf + DEV_BSIZE - DISKLABEL_MINSIZE; 246 for (;; lp = (void *)((caddr_t)lp + sizeof(uint32_t))) { 247 if ((caddr_t)lp > lp_lim) 248 return (SCAN_CONTINUE); 249 label_offset = (size_t)((caddr_t)lp - (caddr_t)a->buf); 250 if (lp->d_magic != DISKMAGIC || lp->d_magic2 != DISKMAGIC) { 251 if (lp->d_magic == bswap32(DISKMAGIC) && 252 lp->d_magic2 == bswap32(DISKMAGIC)) { 253 /* 254 * Label is in the other byte order; validate 255 * its length, then byte-swap it. 256 */ 257 if ((caddr_t)lp + 258 DISKLABEL_SIZE(bswap16(lp->d_npartitions)) > 259 (caddr_t)a->buf + DEV_BSIZE) { 260 aprint_error("%s: BSD disklabel @ " 261 "%" PRId64 262 "+%zd has bogus partition " 263 "count (%u)\n", a->pdk->dk_name, 264 label_sector, label_offset, 265 bswap16(lp->d_npartitions)); 266 continue; 267 } 268 checksum = dkcksum_sized(lp, 269 bswap16(lp->d_npartitions)); 270 swap_disklabel(lp); 271 } else 272 continue; 273 } else { 274 /* 275 * Validate the disklabel length. 276 */ 277 if ((caddr_t)lp + DISKLABEL_SIZE(lp->d_npartitions) > 278 (caddr_t)a->buf + DEV_BSIZE) { 279 aprint_error("%s: BSD disklabel @ %" PRId64 280 "+%zd has bogus partition count (%u)\n", 281 a->pdk->dk_name, label_sector, 282 label_offset, lp->d_npartitions); 283 continue; 284 } 285 checksum = dkcksum(lp); 286 } 287 288 /* 289 * Disklabel is now in the right order and we have validated 290 * the partition count, checksum it as the final check. 291 */ 292 if (checksum != 0) { 293 aprint_error("%s: BSD disklabel @ %" PRId64 294 "+%zd has bad checksum\n", a->pdk->dk_name, 295 label_sector, label_offset); 296 continue; 297 } 298 299 /* 300 * Ok, we have a valid NetBSD disklabel, add wedges for it. 301 */ 302 for (i = 0; i < lp->d_npartitions; i++) { 303 struct dkwedge_info dkw; 304 struct partition *p; 305 const char *ptype; 306 307 p = &lp->d_partitions[i]; 308 309 if (p->p_fstype == FS_UNUSED) 310 continue; 311 if ((ptype = 312 bsdlabel_fstype_to_str(p->p_fstype)) == NULL) { 313 /* 314 * XXX Should probably just add these... 315 * XXX maybe just have an empty ptype? 316 */ 317 aprint_verbose("%s: skipping partition %d, " 318 "type %d\n", a->pdk->dk_name, i, 319 p->p_fstype); 320 continue; 321 } 322 strcpy(dkw.dkw_ptype, ptype); 323 324 strcpy(dkw.dkw_parent, a->pdk->dk_name); 325 dkw.dkw_offset = p->p_offset; 326 dkw.dkw_size = p->p_size; 327 328 /* 329 * These get historical disk naming style 330 * wedge names. 331 */ 332 snprintf(dkw.dkw_wname, sizeof(dkw.dkw_wname), 333 "%s%c", a->pdk->dk_name, 'a' + i); 334 335 error = dkwedge_add(&dkw); 336 if (error == EEXIST) 337 aprint_error("%s: wedge named '%s' already " 338 "exists, manual intervention required\n", 339 a->pdk->dk_name, dkw.dkw_wname); 340 else if (error) 341 aprint_error("%s: error %d adding partition " 342 "%d type %d\n", a->pdk->dk_name, error, 343 i, p->p_fstype); 344 } 345 return (SCAN_FOUND); 346 } 347 } 348 349 static int 350 scan_mbr(mbr_args_t *a, int (*actn)(mbr_args_t *, struct mbr_partition *, 351 int, u_int)) 352 { 353 struct mbr_partition ptns[MBR_PART_COUNT]; 354 struct mbr_partition *dp; 355 struct mbr_sector *mbr; 356 u_int ext_base, this_ext, next_ext; 357 int i, rval; 358 #ifdef COMPAT_386BSD_MBRPART 359 int dp_386bsd = -1; 360 #endif 361 362 ext_base = 0; 363 this_ext = 0; 364 for (;;) { 365 a->error = dkwedge_read(a->pdk, a->vp, this_ext, a->buf, 366 DEV_BSIZE); 367 if (a->error) { 368 aprint_error("%s: unable to read MBR @ %u, " 369 "error = %d\n", a->pdk->dk_name, this_ext, 370 a->error); 371 return (SCAN_ERROR); 372 } 373 374 mbr = a->buf; 375 if (mbr->mbr_magic != htole16(MBR_MAGIC)) 376 return (SCAN_CONTINUE); 377 378 /* Copy data out of buffer so action can use the buffer. */ 379 memcpy(ptns, &mbr->mbr_parts, sizeof(ptns)); 380 381 /* Looks for NetBSD partition. */ 382 next_ext = 0; 383 dp = ptns; 384 for (i = 0; i < MBR_PART_COUNT; i++, dp++) { 385 if (dp->mbrp_type == 0) 386 continue; 387 if (MBR_IS_EXTENDED(dp->mbrp_type)) { 388 next_ext = le32toh(dp->mbrp_start); 389 continue; 390 } 391 #ifdef COMPAT_386BSD_MBRPART 392 if (dp->mbrp_type == MBR_PTYPE_386BSD) { 393 /* 394 * If more than one matches, take last, 395 * as NetBSD install tool does. 396 */ 397 if (this_ext == 0) 398 dp_386bsd = i; 399 continue; 400 } 401 #endif 402 rval = (*actn)(a, dp, i, this_ext); 403 if (rval != SCAN_CONTINUE) 404 return (rval); 405 } 406 if (next_ext == 0) 407 break; 408 if (ext_base == 0) { 409 ext_base = next_ext; 410 next_ext = 0; 411 } 412 next_ext += ext_base; 413 if (next_ext <= this_ext) 414 break; 415 this_ext = next_ext; 416 } 417 #ifdef COMPAT_386BSD_MBRPART 418 if (this_ext == 0 && dp_386bsd != -1) 419 return ((*actn)(a, &ptns[dp_386bsd], dp_386bsd, 0)); 420 #endif 421 return (SCAN_CONTINUE); 422 } 423 424 static int 425 look_netbsd_part(mbr_args_t *a, struct mbr_partition *dp, int slot, 426 u_int ext_base) 427 { 428 int ptn_base = ext_base + le32toh(dp->mbrp_start); 429 int rval; 430 431 if ( 432 #ifdef COMPAT_386BSD_MBRPART 433 dp->mbrp_type == MBR_PTYPE_386BSD || 434 #endif 435 dp->mbrp_type == MBR_PTYPE_NETBSD) { 436 rval = validate_label(a, ptn_base + BSD44_MBR_LABELSECTOR, 0); 437 438 /* If we got a NetBSD label, look no further. */ 439 if (rval == SCAN_FOUND) 440 return (rval); 441 } 442 443 return (SCAN_CONTINUE); 444 } 445 446 static int 447 dkwedge_discover_bsdlabel(struct disk *pdk, struct vnode *vp) 448 { 449 mbr_args_t a; 450 const struct disklabel_location *dl; 451 int rval; 452 453 a.pdk = pdk; 454 a.vp = vp; 455 a.buf = malloc(DEV_BSIZE, M_DEVBUF, M_WAITOK); 456 a.error = 0; 457 458 /* MBR search. */ 459 rval = scan_mbr(&a, look_netbsd_part); 460 if (rval != SCAN_CONTINUE) { 461 if (rval == SCAN_FOUND) 462 a.error = 0; /* found it, wedges installed */ 463 goto out; 464 } 465 466 /* Known location search. */ 467 for (dl = disklabel_locations; dl->label_sector != -1; dl++) { 468 rval = validate_label(&a, dl->label_sector, dl->label_offset); 469 if (rval != SCAN_CONTINUE) { 470 if (rval == SCAN_FOUND) 471 a.error = 0; /* found it, wedges installed */ 472 goto out; 473 } 474 } 475 476 /* No NetBSD disklabel found. */ 477 a.error = ESRCH; 478 out: 479 free(a.buf, M_DEVBUF); 480 return (a.error); 481 } 482 483 DKWEDGE_DISCOVERY_METHOD_DECL(BSD44, 5, dkwedge_discover_bsdlabel); 484
Indexes created Tue Sep 30 07:10:03 GMT 2025