dkwedge_bsdlabel.c revision 1.8
1 /* $NetBSD: dkwedge_bsdlabel.c,v 1.8 2006/10/12 01:30:57 christos 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 1.8 2006/10/12 01:30:57 christos 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; 229 230 error = dkwedge_read(a->pdk, a->vp, label_sector, a->buf, DEV_BSIZE); 231 if (error) { 232 aprint_error("%s: unable to read BSD disklabel @ %" PRId64 233 ", error = %d\n", a->pdk->dk_name, label_sector, error); 234 a->error = error; 235 return (SCAN_ERROR); 236 } 237 238 /* 239 * We ignore label_offset; this seems to have not been used 240 * consistently in the old code, requiring us to do the search 241 * in the sector. 242 */ 243 lp = a->buf; 244 lp_lim = (caddr_t)a->buf + DEV_BSIZE - DISKLABEL_MINSIZE; 245 for (;; lp = (void *)((caddr_t)lp + sizeof(uint32_t))) { 246 if ((caddr_t)lp > lp_lim) 247 return (SCAN_CONTINUE); 248 label_offset = (size_t)((caddr_t)lp - (caddr_t)a->buf); 249 if (lp->d_magic != DISKMAGIC || lp->d_magic2 != DISKMAGIC) { 250 if (lp->d_magic == bswap32(DISKMAGIC) && 251 lp->d_magic2 == bswap32(DISKMAGIC)) { 252 /* 253 * Label is in the other byte order; validate 254 * its length, then byte-swap it. 255 */ 256 if ((caddr_t)lp + 257 DISKLABEL_SIZE(bswap16(lp->d_npartitions)) > 258 (caddr_t)a->buf + DEV_BSIZE) { 259 aprint_error("%s: BSD disklabel @ " 260 "%" PRId64 261 "+%zd has bogus partition " 262 "count (%u)\n", a->pdk->dk_name, 263 label_sector, label_offset, 264 bswap16(lp->d_npartitions)); 265 continue; 266 } 267 swap_disklabel(lp); 268 } else 269 continue; 270 } else { 271 /* 272 * Validate the disklabel length. 273 */ 274 if ((caddr_t)lp + DISKLABEL_SIZE(lp->d_npartitions) > 275 (caddr_t)a->buf + DEV_BSIZE) { 276 aprint_error("%s: BSD disklabel @ %" PRId64 277 "+%zd has bogus partition count (%u)\n", 278 a->pdk->dk_name, label_sector, 279 label_offset, lp->d_npartitions); 280 continue; 281 } 282 } 283 284 /* 285 * Disklabel is now in the right order and we have validated 286 * the partition count, checksum it as the final check. 287 */ 288 if (dkcksum(lp) != 0) { 289 aprint_error("%s: BSD disklabel @ %" PRId64 290 "+%zd has bad checksum\n", a->pdk->dk_name, 291 label_sector, label_offset); 292 continue; 293 } 294 295 /* 296 * Ok, we have a valid NetBSD disklabel, add wedges for it. 297 */ 298 for (i = 0; i < lp->d_npartitions; i++) { 299 struct dkwedge_info dkw; 300 struct partition *p; 301 const char *ptype; 302 303 p = &lp->d_partitions[i]; 304 305 if (p->p_fstype == FS_UNUSED) 306 continue; 307 if ((ptype = 308 bsdlabel_fstype_to_str(p->p_fstype)) == NULL) { 309 /* 310 * XXX Should probably just add these... 311 * XXX maybe just have an empty ptype? 312 */ 313 aprint_verbose("%s: skipping partition %d, " 314 "type %d\n", a->pdk->dk_name, i, 315 p->p_fstype); 316 continue; 317 } 318 strcpy(dkw.dkw_ptype, ptype); 319 320 strcpy(dkw.dkw_parent, a->pdk->dk_name); 321 dkw.dkw_offset = p->p_offset; 322 dkw.dkw_size = p->p_size; 323 324 /* 325 * These get historical disk naming style 326 * wedge names. 327 */ 328 snprintf(dkw.dkw_wname, sizeof(dkw.dkw_wname), 329 "%s%c", a->pdk->dk_name, 'a' + i); 330 331 error = dkwedge_add(&dkw); 332 if (error == EEXIST) 333 aprint_error("%s: wedge named '%s' already " 334 "exists, manual intervention required\n", 335 a->pdk->dk_name, dkw.dkw_wname); 336 else if (error) 337 aprint_error("%s: error %d adding partition " 338 "%d type %d\n", a->pdk->dk_name, error, 339 i, p->p_fstype); 340 } 341 return (SCAN_FOUND); 342 } 343 } 344 345 static int 346 scan_mbr(mbr_args_t *a, int (*actn)(mbr_args_t *, struct mbr_partition *, 347 int, u_int)) 348 { 349 struct mbr_partition ptns[MBR_PART_COUNT]; 350 struct mbr_partition *dp; 351 struct mbr_sector *mbr; 352 u_int ext_base, this_ext, next_ext; 353 int i, rval; 354 #ifdef COMPAT_386BSD_MBRPART 355 int dp_386bsd = -1; 356 #endif 357 358 ext_base = 0; 359 this_ext = 0; 360 for (;;) { 361 a->error = dkwedge_read(a->pdk, a->vp, this_ext, a->buf, 362 DEV_BSIZE); 363 if (a->error) { 364 aprint_error("%s: unable to read MBR @ %u, " 365 "error = %d\n", a->pdk->dk_name, this_ext, 366 a->error); 367 return (SCAN_ERROR); 368 } 369 370 mbr = a->buf; 371 if (mbr->mbr_magic != htole16(MBR_MAGIC)) 372 return (SCAN_CONTINUE); 373 374 /* Copy data out of buffer so action can use the buffer. */ 375 memcpy(ptns, &mbr->mbr_parts, sizeof(ptns)); 376 377 /* Looks for NetBSD partition. */ 378 next_ext = 0; 379 dp = ptns; 380 for (i = 0; i < MBR_PART_COUNT; i++, dp++) { 381 if (dp->mbrp_type == 0) 382 continue; 383 if (MBR_IS_EXTENDED(dp->mbrp_type)) { 384 next_ext = le32toh(dp->mbrp_start); 385 continue; 386 } 387 #ifdef COMPAT_386BSD_MBRPART 388 if (dp->mbrp_type == MBR_PTYPE_386BSD) { 389 /* 390 * If more than one matches, take last, 391 * as NetBSD install tool does. 392 */ 393 if (this_ext == 0) 394 dp_386bsd = i; 395 continue; 396 } 397 #endif 398 rval = (*actn)(a, dp, i, this_ext); 399 if (rval != SCAN_CONTINUE) 400 return (rval); 401 } 402 if (next_ext == 0) 403 break; 404 if (ext_base == 0) { 405 ext_base = next_ext; 406 next_ext = 0; 407 } 408 next_ext += ext_base; 409 if (next_ext <= this_ext) 410 break; 411 this_ext = next_ext; 412 } 413 #ifdef COMPAT_386BSD_MBRPART 414 if (this_ext == 0 && dp_386bsd != -1) 415 return ((*actn)(a, &ptns[dp_386bsd], dp_386bsd, 0)); 416 #endif 417 return (SCAN_CONTINUE); 418 } 419 420 static int 421 look_netbsd_part(mbr_args_t *a, struct mbr_partition *dp, int slot __unused, 422 u_int ext_base) 423 { 424 int ptn_base = ext_base + le32toh(dp->mbrp_start); 425 int rval; 426 427 if ( 428 #ifdef COMPAT_386BSD_MBRPART 429 dp->mbrp_type == MBR_PTYPE_386BSD || 430 #endif 431 dp->mbrp_type == MBR_PTYPE_NETBSD) { 432 rval = validate_label(a, ptn_base + BSD44_MBR_LABELSECTOR, 0); 433 434 /* If we got a NetBSD label, look no further. */ 435 if (rval == SCAN_FOUND) 436 return (rval); 437 } 438 439 return (SCAN_CONTINUE); 440 } 441 442 static int 443 dkwedge_discover_bsdlabel(struct disk *pdk, struct vnode *vp) 444 { 445 mbr_args_t a; 446 const struct disklabel_location *dl; 447 int rval; 448 449 a.pdk = pdk; 450 a.vp = vp; 451 a.buf = malloc(DEV_BSIZE, M_DEVBUF, M_WAITOK); 452 a.error = 0; 453 454 /* MBR search. */ 455 rval = scan_mbr(&a, look_netbsd_part); 456 if (rval != SCAN_CONTINUE) { 457 if (rval == SCAN_FOUND) 458 a.error = 0; /* found it, wedges installed */ 459 goto out; 460 } 461 462 /* Known location search. */ 463 for (dl = disklabel_locations; dl->label_sector != -1; dl++) { 464 rval = validate_label(&a, dl->label_sector, dl->label_offset); 465 if (rval != SCAN_CONTINUE) { 466 if (rval == SCAN_FOUND) 467 a.error = 0; /* found it, wedges installed */ 468 goto out; 469 } 470 } 471 472 /* No NetBSD disklabel found. */ 473 a.error = ESRCH; 474 out: 475 free(a.buf, M_DEVBUF); 476 return (a.error); 477 } 478 479 DKWEDGE_DISCOVERY_METHOD_DECL(BSD44, 5, dkwedge_discover_bsdlabel); 480
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