1 /* $NetBSD: dkwedge_bsdlabel.c,v 1.25 2020/04/11 16:00:34 jdolecek 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 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * Adapted from kern/subr_disk_mbr.c: 34 * 35 * Copyright (c) 1982, 1986, 1988 Regents of the University of California. 36 * All rights reserved. 37 * 38 * Redistribution and use in source and binary forms, with or without 39 * modification, are permitted provided that the following conditions 40 * are met: 41 * 1. Redistributions of source code must retain the above copyright 42 * notice, this list of conditions and the following disclaimer. 43 * 2. Redistributions in binary form must reproduce the above copyright 44 * notice, this list of conditions and the following disclaimer in the 45 * documentation and/or other materials provided with the distribution. 46 * 3. Neither the name of the University nor the names of its contributors 47 * may be used to endorse or promote products derived from this software 48 * without specific prior written permission. 49 * 50 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 51 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 53 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 54 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 55 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 56 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 57 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 58 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 59 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 60 * SUCH DAMAGE. 61 * 62 * @(#)ufs_disksubr.c 7.16 (Berkeley) 5/4/91 63 */ 64 65 /* 66 * 4.4BSD disklabel support for disk wedges 67 * 68 * Here is the basic search algorithm in use here: 69 * 70 * For historical reasons, we scan for x86-style MBR partitions looking 71 * for a MBR_PTYPE_NETBSD (or MBR_PTYPE_386BSD) partition. The first 72 * 4.4BSD disklabel found in the 2nd sector of such a partition is used. 73 * We assume that the 4.4BSD disklabel describes all partitions on the 74 * disk; we do not use any partition information from the MBR partition 75 * table. 76 * 77 * If that fails, then we fall back on a table of known locations for 78 * various platforms. 79 */ 80 81 #include <sys/cdefs.h> 82 __KERNEL_RCSID(0, "$NetBSD: dkwedge_bsdlabel.c,v 1.25 2020/04/11 16:00:34 jdolecek Exp $"); 83 84 #include <sys/param.h> 85 #ifdef _KERNEL 86 #include <sys/systm.h> 87 #endif 88 #include <sys/proc.h> 89 #include <sys/errno.h> 90 #include <sys/disk.h> 91 #include <sys/vnode.h> 92 #include <sys/buf.h> 93 94 #include <sys/bootblock.h> 95 #include <sys/disklabel.h> 96 97 #define BSD44_MBR_LABELSECTOR 1 98 99 #define DISKLABEL_SIZE(x) \ 100 (offsetof(struct disklabel, d_partitions) + \ 101 (sizeof(struct partition) * (x))) 102 103 /* 104 * Note the smallest MAXPARTITIONS was 8, so we allow a disklabel 105 * that size to be locted at the end of the sector. 106 */ 107 #define DISKLABEL_MINSIZE DISKLABEL_SIZE(8) 108 109 /* 110 * Table of known platform-specific disklabel locations. 111 */ 112 static const struct disklabel_location { 113 daddr_t label_sector; /* sector containing label */ 114 size_t label_offset; /* byte offset of label in sector */ 115 } disklabel_locations[] = { 116 { 0, 0 }, /* mvme68k, next68k */ 117 { 0, 64 }, /* algor, alpha, amiga, amigappc, evbmips, evbppc, 118 luna68k, mac68k, macppc, news68k, newsmips, 119 pc532, pdp11, pmax, vax, x68k */ 120 { 0, 128 }, /* sparc, sun68k */ 121 { 1, 0 }, /* amd64, arc, arm, bebox, cobalt, evbppc, hppa, 122 hpcarm, hpcmips, i386, ibmnws, mipsco, mvmeppc, 123 ofppc, playstation2, pmppc, prep, sandpoint, 124 sbmips, sgimips, sh3 */ 125 /* XXX atari is weird */ 126 { 2, 0 }, /* cesfic, hp300 */ 127 128 { -1, 0 }, 129 }; 130 131 #define SCAN_CONTINUE 0 132 #define SCAN_FOUND 1 133 #define SCAN_ERROR 2 134 135 typedef struct mbr_args { 136 struct disk *pdk; 137 struct vnode *vp; 138 struct buf *bp; 139 int error; 140 uint32_t secsize; 141 } mbr_args_t; 142 143 static const char * 144 bsdlabel_fstype_to_str(uint8_t fstype) 145 { 146 const char *str; 147 148 /* 149 * For each type known to FSTYPE_DEFN (from <sys/disklabel.h>), 150 * a suitable case branch will convert the type number to a string. 151 */ 152 switch (fstype) { 153 #define FSTYPE_TO_STR_CASE(tag, number, name, fsck, mount) \ 154 case __CONCAT(FS_,tag): str = __CONCAT(DKW_PTYPE_,tag); break; 155 FSTYPE_DEFN(FSTYPE_TO_STR_CASE) 156 #undef FSTYPE_TO_STR_CASE 157 default: str = NULL; break; 158 } 159 160 return (str); 161 } 162 163 static void 164 swap_disklabel(struct disklabel *lp) 165 { 166 int i; 167 168 #define SWAP16(x) lp->x = bswap16(lp->x) 169 #define SWAP32(x) lp->x = bswap32(lp->x) 170 171 SWAP32(d_magic); 172 SWAP16(d_type); 173 SWAP16(d_subtype); 174 SWAP32(d_secsize); 175 SWAP32(d_nsectors); 176 SWAP32(d_ntracks); 177 SWAP32(d_ncylinders); 178 SWAP32(d_secpercyl); 179 SWAP32(d_secperunit); 180 SWAP16(d_sparespertrack); 181 SWAP16(d_sparespercyl); 182 SWAP32(d_acylinders); 183 SWAP16(d_rpm); 184 SWAP16(d_interleave); 185 SWAP16(d_trackskew); 186 SWAP16(d_cylskew); 187 SWAP32(d_headswitch); 188 SWAP32(d_trkseek); 189 SWAP32(d_flags); 190 191 for (i = 0; i < NDDATA; i++) 192 SWAP32(d_drivedata[i]); 193 for (i = 0; i < NSPARE; i++) 194 SWAP32(d_spare[i]); 195 196 SWAP32(d_magic2); 197 SWAP16(d_checksum); 198 SWAP16(d_npartitions); 199 SWAP32(d_bbsize); 200 SWAP32(d_sbsize); 201 202 for (i = 0; i < lp->d_npartitions; i++) { 203 SWAP32(d_partitions[i].p_size); 204 SWAP32(d_partitions[i].p_offset); 205 SWAP32(d_partitions[i].p_fsize); 206 SWAP16(d_partitions[i].p_cpg); 207 } 208 209 #undef SWAP16 210 #undef SWAP32 211 } 212 213 /* 214 * Add wedges for a valid NetBSD disklabel. 215 */ 216 static void 217 addwedges(const mbr_args_t *a, const struct disklabel *lp) 218 { 219 int error, i; 220 221 for (i = 0; i < lp->d_npartitions; i++) { 222 struct dkwedge_info dkw; 223 const struct partition *p; 224 const char *ptype; 225 226 p = &lp->d_partitions[i]; 227 228 if (p->p_fstype == FS_UNUSED) 229 continue; 230 231 memset(&dkw, 0, sizeof(dkw)); 232 233 ptype = bsdlabel_fstype_to_str(p->p_fstype); 234 if (ptype == NULL) 235 snprintf(dkw.dkw_ptype, sizeof(dkw.dkw_ptype), 236 "unknown#%u", p->p_fstype); 237 else 238 strlcpy(dkw.dkw_ptype, ptype, sizeof(dkw.dkw_ptype)); 239 240 strlcpy(dkw.dkw_parent, a->pdk->dk_name, 241 sizeof(dkw.dkw_parent)); 242 dkw.dkw_offset = p->p_offset; 243 dkw.dkw_size = p->p_size; 244 245 /* 246 * If the label defines a name, append the partition 247 * letter and use it as the wedge name. 248 * Otherwise use historical disk naming style 249 * wedge names. 250 */ 251 if (lp->d_packname[0] && 252 strcmp(lp->d_packname,"fictitious") != 0) { 253 snprintf((char *)&dkw.dkw_wname, sizeof(dkw.dkw_wname), 254 "%.*s/%c", (int)sizeof(dkw.dkw_wname)-3, 255 lp->d_packname, 'a' + i); 256 } else { 257 snprintf((char *)&dkw.dkw_wname, sizeof(dkw.dkw_wname), 258 "%s%c", a->pdk->dk_name, 'a' + i); 259 } 260 261 error = dkwedge_add(&dkw); 262 if (error == EEXIST) 263 aprint_error("%s: wedge named '%s' already " 264 "exists, manual intervention required\n", 265 a->pdk->dk_name, dkw.dkw_wname); 266 else if (error) 267 aprint_error("%s: error %d adding partition " 268 "%d type %d\n", a->pdk->dk_name, error, 269 i, p->p_fstype); 270 } 271 } 272 273 static int 274 validate_label(mbr_args_t *a, daddr_t label_sector, size_t label_offset) 275 { 276 struct disklabel *lp; 277 void *lp_lim; 278 int error, swapped; 279 uint16_t npartitions; 280 281 error = dkwedge_read(a->pdk, a->vp, label_sector, a->bp->b_data, 282 a->secsize); 283 if (error) { 284 aprint_error("%s: unable to read BSD disklabel @ %" PRId64 285 ", error = %d\n", a->pdk->dk_name, label_sector, error); 286 a->error = error; 287 return (SCAN_ERROR); 288 } 289 290 /* 291 * We ignore label_offset; this seems to have not been used 292 * consistently in the old code, requiring us to do the search 293 * in the sector. 294 */ 295 lp = a->bp->b_data; 296 lp_lim = (char *)a->bp->b_data + a->secsize - DISKLABEL_MINSIZE; 297 for (;; lp = (void *)((char *)lp + sizeof(uint32_t))) { 298 if ((char *)lp > (char *)lp_lim) 299 return (SCAN_CONTINUE); 300 label_offset = (size_t)((char *)lp - (char *)a->bp->b_data); 301 if (lp->d_magic != DISKMAGIC || lp->d_magic2 != DISKMAGIC) { 302 if (lp->d_magic != bswap32(DISKMAGIC) || 303 lp->d_magic2 != bswap32(DISKMAGIC)) 304 continue; 305 /* Label is in the other byte order. */ 306 swapped = 1; 307 } else 308 swapped = 0; 309 310 npartitions = (swapped) ? bswap16(lp->d_npartitions) 311 : lp->d_npartitions; 312 313 /* Validate label length. */ 314 if ((char *)lp + DISKLABEL_SIZE(npartitions) > 315 (char *)a->bp->b_data + a->secsize) { 316 aprint_error("%s: BSD disklabel @ " 317 "%" PRId64 "+%zd has bogus partition count (%u)\n", 318 a->pdk->dk_name, label_sector, label_offset, 319 npartitions); 320 continue; 321 } 322 323 /* 324 * We have validated the partition count. Checksum it. 325 * Note that we purposefully checksum before swapping 326 * the byte order. 327 */ 328 if (dkcksum_sized(lp, npartitions) != 0) { 329 aprint_error("%s: BSD disklabel @ %" PRId64 330 "+%zd has bad checksum\n", a->pdk->dk_name, 331 label_sector, label_offset); 332 continue; 333 } 334 /* Put the disklabel in the right order. */ 335 if (swapped) 336 swap_disklabel(lp); 337 addwedges(a, lp); 338 return (SCAN_FOUND); 339 } 340 } 341 342 static int 343 scan_mbr(mbr_args_t *a, int (*actn)(mbr_args_t *, struct mbr_partition *, 344 int, u_int)) 345 { 346 struct mbr_partition ptns[MBR_PART_COUNT]; 347 struct mbr_partition *dp; 348 struct mbr_sector *mbr; 349 u_int ext_base, this_ext, next_ext; 350 int i, rval; 351 #ifdef COMPAT_386BSD_MBRPART 352 int dp_386bsd = -1; 353 #endif 354 355 ext_base = 0; 356 this_ext = 0; 357 for (;;) { 358 a->error = dkwedge_read(a->pdk, a->vp, this_ext, a->bp->b_data, 359 a->secsize); 360 if (a->error) { 361 aprint_error("%s: unable to read MBR @ %u, " 362 "error = %d\n", a->pdk->dk_name, this_ext, 363 a->error); 364 return (SCAN_ERROR); 365 } 366 367 mbr = a->bp->b_data; 368 if (mbr->mbr_magic != htole16(MBR_MAGIC)) 369 return (SCAN_CONTINUE); 370 371 /* Copy data out of buffer so action can use the buffer. */ 372 memcpy(ptns, &mbr->mbr_parts, sizeof(ptns)); 373 374 /* Looks for NetBSD partition. */ 375 next_ext = 0; 376 dp = ptns; 377 for (i = 0; i < MBR_PART_COUNT; i++, dp++) { 378 if (dp->mbrp_type == 0) 379 continue; 380 if (MBR_IS_EXTENDED(dp->mbrp_type)) { 381 next_ext = le32toh(dp->mbrp_start); 382 continue; 383 } 384 #ifdef COMPAT_386BSD_MBRPART 385 if (dp->mbrp_type == MBR_PTYPE_386BSD) { 386 /* 387 * If more than one matches, take last, 388 * as NetBSD install tool does. 389 */ 390 if (this_ext == 0) 391 dp_386bsd = i; 392 continue; 393 } 394 #endif 395 rval = (*actn)(a, dp, i, this_ext); 396 if (rval != SCAN_CONTINUE) 397 return (rval); 398 } 399 if (next_ext == 0) 400 break; 401 if (ext_base == 0) { 402 ext_base = next_ext; 403 next_ext = 0; 404 } 405 next_ext += ext_base; 406 if (next_ext <= this_ext) 407 break; 408 this_ext = next_ext; 409 } 410 #ifdef COMPAT_386BSD_MBRPART 411 if (this_ext == 0 && dp_386bsd != -1) 412 return ((*actn)(a, &ptns[dp_386bsd], dp_386bsd, 0)); 413 #endif 414 return (SCAN_CONTINUE); 415 } 416 417 static int 418 look_netbsd_part(mbr_args_t *a, struct mbr_partition *dp, int slot, 419 u_int ext_base) 420 { 421 int ptn_base = ext_base + le32toh(dp->mbrp_start); 422 int rval; 423 424 if ( 425 #ifdef COMPAT_386BSD_MBRPART 426 dp->mbrp_type == MBR_PTYPE_386BSD || 427 #endif 428 dp->mbrp_type == MBR_PTYPE_NETBSD) { 429 rval = validate_label(a, ptn_base + BSD44_MBR_LABELSECTOR, 0); 430 431 /* If we got a NetBSD label, look no further. */ 432 if (rval == SCAN_FOUND) 433 return (rval); 434 } 435 436 return (SCAN_CONTINUE); 437 } 438 439 static int 440 dkwedge_discover_bsdlabel(struct disk *pdk, struct vnode *vp) 441 { 442 mbr_args_t a; 443 const struct disklabel_location *dl; 444 int rval; 445 446 a.pdk = pdk; 447 a.secsize = DEV_BSIZE << pdk->dk_blkshift; 448 a.vp = vp; 449 a.bp = geteblk(a.secsize); 450 a.error = 0; 451 452 /* MBR search. */ 453 rval = scan_mbr(&a, look_netbsd_part); 454 if (rval != SCAN_CONTINUE) { 455 if (rval == SCAN_FOUND) 456 a.error = 0; /* found it, wedges installed */ 457 goto out; 458 } 459 460 /* Known location search. */ 461 for (dl = disklabel_locations; dl->label_sector != -1; dl++) { 462 rval = validate_label(&a, dl->label_sector, dl->label_offset); 463 if (rval != SCAN_CONTINUE) { 464 if (rval == SCAN_FOUND) 465 a.error = 0; /* found it, wedges installed */ 466 goto out; 467 } 468 } 469 470 /* No NetBSD disklabel found. */ 471 a.error = ESRCH; 472 out: 473 brelse(a.bp, 0); 474 return (a.error); 475 } 476 477 #ifdef _KERNEL 478 DKWEDGE_DISCOVERY_METHOD_DECL(BSD44, 5, dkwedge_discover_bsdlabel); 479 #endif 480
Indexes created Sat Sep 20 22:09:52 GMT 2025