1 /* $NetBSD: disksubr.c,v 1.37 2024/01/07 07:58:35 isaki Exp $ */ 2 3 /* 4 * Copyright (c) 1982, 1986, 1988 Regents of the University of California. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)ufs_disksubr.c 7.16 (Berkeley) 5/4/91 32 */ 33 34 #include <sys/cdefs.h> 35 __KERNEL_RCSID(0, "$NetBSD: disksubr.c,v 1.37 2024/01/07 07:58:35 isaki Exp $"); 36 37 #include "opt_compat_netbsd.h" 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/buf.h> 42 #include <sys/disklabel.h> 43 #include <sys/syslog.h> 44 #include <sys/disk.h> 45 46 /* get rid of DEV_BSIZE dependency */ 47 #define DEF_BSIZE DEV_BSIZE /* default sector size = 512 */ 48 49 static void parttbl_consistency_check(struct disklabel *, 50 struct dos_partition *); 51 52 53 /* 54 * Attempt to read a disk label from a device 55 * using the indicated strategy routine. 56 * The label must be partly set up before this: 57 * secpercyl, secsize and anything required for a block i/o read 58 * operation in the driver's strategy/start routines 59 * must be filled in before calling us. 60 * 61 * Returns null on success and an error string on failure. 62 */ 63 const char * 64 readdisklabel(dev_t dev, void (*strat)(struct buf *), 65 struct disklabel *lp, struct cpu_disklabel *osdep) 66 { 67 struct dos_partition *dp = 0; 68 struct dkbad *bdp = &osdep->bad; 69 struct buf *bp; 70 struct disklabel *dlp; 71 const char *msg = NULL; 72 int i, bsdlabelsz, humanlabelsz; 73 74 if (osdep) 75 dp = osdep->dosparts; 76 /* minimal requirements for archtypal disk label */ 77 if (lp->d_secsize == 0) 78 lp->d_secsize = DEF_BSIZE; 79 if (lp->d_secperunit == 0) 80 lp->d_secperunit = 0x1fffffff; 81 lp->d_npartitions = RAW_PART + 1; 82 for (i = 0; i < RAW_PART; i++) { 83 lp->d_partitions[i].p_size = 0; 84 lp->d_partitions[i].p_offset = 0; 85 } 86 if (lp->d_partitions[RAW_PART].p_size == 0) 87 lp->d_partitions[RAW_PART].p_size = lp->d_secperunit; 88 lp->d_partitions[RAW_PART].p_offset = 0; 89 90 lp->d_partitions[0].p_size = lp->d_partitions[RAW_PART].p_size; 91 92 /* get a buffer and initialize it */ 93 bsdlabelsz = 94 howmany(LABELOFFSET + sizeof(struct disklabel), lp->d_secsize) 95 * lp->d_secsize; 96 humanlabelsz = 97 howmany(sizeof(struct cpu_disklabel), lp->d_secsize) 98 * lp->d_secsize; 99 bp = geteblk(MAX(bsdlabelsz, humanlabelsz)); 100 bp->b_dev = dev; 101 102 /* read BSD disklabel first */ 103 bp->b_blkno = LABELSECTOR; 104 bp->b_cylinder = LABELSECTOR/lp->d_secpercyl; 105 bp->b_bcount = bsdlabelsz; /* to support < 512B/sector disks */ 106 bp->b_flags |= B_READ; 107 (*strat)(bp); 108 109 /* if successful, locate disk label within block and validate */ 110 if (biowait(bp)) { 111 msg = "disk label I/O error"; 112 goto dodospart; 113 } 114 for (dlp = (struct disklabel *)bp->b_data; 115 dlp <= (struct disklabel *) 116 ((char *)bp->b_data + bsdlabelsz - sizeof(*dlp)); 117 dlp = (struct disklabel *)((uint8_t *)dlp + sizeof(long))) { 118 if (dlp->d_magic != DISKMAGIC || dlp->d_magic2 != DISKMAGIC) { 119 if (msg == NULL) 120 msg = "no disk label"; 121 } else if (dlp->d_npartitions > MAXPARTITIONS || 122 dkcksum(dlp) != 0) 123 msg = "disk label corrupted"; 124 else { 125 *lp = *dlp; 126 msg = NULL; 127 break; 128 } 129 } 130 131 dodospart: 132 /* next do the Human68k-style partition table */ 133 /* Human68k does not support > 2048B/sector devices (?) */ 134 if (lp->d_secsize >= 2048) { 135 if (msg) 136 goto done; 137 goto dobadsect; 138 } 139 bp->b_blkno = DOSPARTOFF * DEF_BSIZE / lp->d_secsize; 140 /* DOSPARTOFF in DEV_BSIZE unit */ 141 bp->b_cylinder = DOSBBSECTOR / lp->d_secpercyl; 142 bp->b_bcount = humanlabelsz; /* to support < 512B/sector disks */ 143 bp->b_oflags &= ~(BO_DONE); 144 (*strat)(bp); 145 146 /* if successful, wander through Human68k partition table */ 147 if (biowait(bp)) 148 goto done; 149 if (strncmp(bp->b_data, "X68K", 4) != 0) { 150 /* Human68k-style partition table does not exist */ 151 if (msg) 152 goto done; 153 goto dobadsect; 154 } 155 156 /* XXX how do we check veracity/bounds of this? */ 157 if (dp) 158 memcpy(dp, (char *)bp->b_data + sizeof(*dp) /*DOSPARTOFF*/, 159 NDOSPART * sizeof(*dp)); 160 else 161 dp = (void *)((char *)bp->b_data + sizeof(*dp) /*DOSPARTOFF*/); 162 163 /* if BSD disklabel does not exist, fall back to Human68k partition */ 164 if (msg != NULL) { 165 msg = NULL; 166 lp->d_bbsize = 8192; 167 lp->d_sbsize = 2048; 168 for (i = 0; i < NDOSPART; i++, dp++) 169 /* is this ours? */ 170 if (dp->dp_size) { 171 u_char fstype; 172 int part = i + (i < RAW_PART ? 0 : 1); 173 int start = dp->dp_start * 2; 174 int size = dp->dp_size * 2; 175 176 /* update disklabel with details */ 177 lp->d_partitions[part].p_size = size; 178 lp->d_partitions[part].p_offset = start; 179 /* get partition type */ 180 #ifndef COMPAT_10 181 if (dp->dp_flag == 1) 182 fstype = FS_UNUSED; 183 else 184 #endif 185 if (!memcmp(dp->dp_typname, "Human68k", 8)) 186 fstype = FS_MSDOS; 187 else if (!memcmp(dp->dp_typname, 188 "BSD ffs ", 8)) 189 fstype = FS_BSDFFS; 190 else if (!memcmp(dp->dp_typname, 191 "BSD lfs ", 8)) 192 fstype = FS_BSDLFS; 193 else if (!memcmp(dp->dp_typname, 194 "BSD swap", 8)) 195 fstype = FS_SWAP; 196 #ifndef COMPAT_14 197 else if (part == 1) 198 fstype = FS_SWAP; 199 #endif 200 else 201 fstype = FS_BSDFFS; /* XXX */ 202 lp->d_partitions[part].p_fstype = fstype; /* XXX */ 203 if (lp->d_npartitions <= part) 204 lp->d_npartitions = part + 1; 205 } 206 } else { 207 parttbl_consistency_check(lp, dp); 208 } 209 210 dobadsect: 211 /* obtain bad sector table if requested and present */ 212 if (bdp && (lp->d_flags & D_BADSECT)) { 213 struct dkbad *db; 214 215 i = 0; 216 do { 217 /* read a bad sector table */ 218 bp->b_oflags &= ~(BO_DONE); 219 bp->b_flags |= B_READ; 220 bp->b_blkno = lp->d_secperunit - lp->d_nsectors + i; 221 if (lp->d_secsize > DEF_BSIZE) 222 bp->b_blkno *= lp->d_secsize / DEF_BSIZE; 223 else 224 bp->b_blkno /= DEF_BSIZE / lp->d_secsize; 225 bp->b_bcount = lp->d_secsize; 226 bp->b_cylinder = lp->d_ncylinders - 1; 227 (*strat)(bp); 228 229 /* if successful, validate, otherwise try another */ 230 if (biowait(bp)) { 231 msg = "bad sector table I/O error"; 232 } else { 233 db = (struct dkbad *)(bp->b_data); 234 #define DKBAD_MAGIC 0x4321 235 if (db->bt_mbz == 0 236 && db->bt_flag == DKBAD_MAGIC) { 237 msg = NULL; 238 *bdp = *db; 239 break; 240 } else 241 msg = "bad sector table corrupted"; 242 } 243 } while (bp->b_error != 0 && (i += 2) < 10 && 244 i < lp->d_nsectors); 245 } 246 247 done: 248 brelse(bp, 0); 249 return (msg); 250 } 251 252 /* 253 * Write disk label back to device after modification. 254 */ 255 int 256 writedisklabel(dev_t dev, void (*strat)(struct buf *), 257 struct disklabel *lp, struct cpu_disklabel *osdep) 258 { 259 struct dos_partition *dp = 0; 260 struct buf *bp; 261 struct disklabel *dlp; 262 int error, bsdlabelsz, humanlabelsz, i; 263 const char *np; 264 265 if (osdep) 266 dp = osdep->dosparts; 267 /* sanity clause */ 268 if (lp->d_secpercyl == 0 || lp->d_secsize == 0 269 /*|| (lp->d_secsize % DEF_BSIZE) != 0*/) 270 return(EINVAL); 271 if (dp) 272 parttbl_consistency_check(lp, dp); 273 274 /* get a buffer and initialize it */ 275 bsdlabelsz = 276 howmany(LABELOFFSET + sizeof(struct disklabel), lp->d_secsize) 277 * lp->d_secsize; 278 humanlabelsz = 279 howmany(sizeof(struct cpu_disklabel), lp->d_secsize) 280 * lp->d_secsize; 281 bp = geteblk(MAX(bsdlabelsz, humanlabelsz)); 282 bp->b_dev = dev; 283 284 /* attempt to write BSD disklabel first */ 285 bp->b_blkno = LABELSECTOR; 286 bp->b_cylinder = LABELSECTOR / lp->d_secpercyl; 287 bp->b_bcount = bsdlabelsz; /* to support < 512B/sector disks */ 288 bp->b_flags |= B_READ; 289 (*strat)(bp); 290 291 /* if successful, locate disk label within block and validate */ 292 if (biowait(bp)) 293 goto dodospart; 294 error = ESRCH; 295 for (dlp = (struct disklabel *)bp->b_data; 296 dlp <= (struct disklabel *) 297 ((char *)bp->b_data + bsdlabelsz - sizeof(*dlp)); 298 dlp = (struct disklabel *)((char *)dlp + sizeof(long))) { 299 if (dlp->d_magic == DISKMAGIC && dlp->d_magic2 == DISKMAGIC && 300 dkcksum(dlp) == 0) { 301 *dlp = *lp; 302 bp->b_oflags &= ~(BO_DONE); 303 bp->b_flags &= ~(B_READ); 304 bp->b_flags |= B_WRITE; 305 (*strat)(bp); 306 error = biowait(bp); 307 break; 308 } 309 } 310 311 /* do dos partitions in the process of getting disklabel? */ 312 if (error) { 313 dodospart: 314 if (lp->d_secsize >= 2048) { 315 error = ESRCH; 316 goto done; 317 } 318 #if 0 /* there is no mark on floppies */ 319 /* read the x68k disk magic */ 320 bp->b_blkno = DOSBBSECTOR; 321 bp->b_bcount = lp->d_secsize; 322 bp->b_oflags &= ~(BO_DONE); 323 bp->b_flags &= ~(B_WRITE); 324 bp->b_flags |= B_READ; 325 bp->b_cylinder = DOSBBSECTOR / lp->d_secpercyl; 326 (*strat)(bp); 327 if ((error = biowait(bp)) || memcmp(bp->b_data, "X68SCSI1", 8)) 328 printf("warning: disk not marked for x68k"); 329 #endif 330 331 /* read the partition table */ 332 bp->b_blkno = DOSPARTOFF; 333 bp->b_bcount = humanlabelsz; 334 bp->b_oflags &= ~(BO_DONE); 335 bp->b_flags &= ~(B_WRITE); 336 bp->b_flags |= B_READ; 337 bp->b_cylinder = DOSPARTOFF / lp->d_secpercyl; 338 (*strat)(bp); 339 340 if ((error = biowait(bp)) == 0) { 341 /* XXX how do we check veracity/bounds of this? */ 342 dp = (struct dos_partition *)bp->b_data + 1; 343 for (i = 0; i < NDOSPART; i++, dp++) { 344 int part = i + (i < RAW_PART ? 0 : 1); 345 int start, size; 346 347 start = lp->d_partitions[part].p_offset >> 1; 348 size = lp->d_partitions[part].p_size >> 1; 349 350 switch (lp->d_partitions[part].p_fstype) { 351 case FS_MSDOS: 352 np = "Human68k"; 353 dp->dp_flag = 0; /* autoboot */ 354 break; 355 356 case FS_SWAP: 357 np = "BSD swap"; 358 dp->dp_flag = 2; /* in use */ 359 break; 360 361 case FS_BSDFFS: 362 np = "BSD ffs "; 363 if (part == 0) 364 dp->dp_flag = 0; /* autoboot */ 365 else 366 dp->dp_flag = 2; /* in use */ 367 break; 368 369 case FS_BSDLFS: 370 np = "BSD lfs "; 371 if (part == 0) 372 dp->dp_flag = 0; /* autoboot */ 373 else 374 dp->dp_flag = 2; /* in use */ 375 break; 376 377 case FS_UNUSED: 378 np = "\0\0\0\0\0\0\0\0"; 379 start = size = 0; 380 if (part < lp->d_npartitions) { 381 dp->dp_flag = 1; 382 } else { 383 dp->dp_flag = 0; 384 } 385 break; 386 387 default: 388 /* XXX OS-9, MINIX etc. */ 389 continue; 390 } 391 memcpy(dp->dp_typname, np, 8); 392 dp->dp_start = start; 393 dp->dp_size = size; 394 } 395 bp->b_oflags &= ~(BO_DONE); 396 bp->b_flags &= ~(B_READ); 397 bp->b_flags |= B_WRITE; 398 (*strat)(bp); 399 error = biowait(bp); 400 } 401 } 402 403 #ifdef maybe 404 /* disklabel in appropriate location? */ 405 if (lp->d_partitions[0].p_offset != 0 406 && lp->d_partitions[0].p_offset != dospartoff) { 407 error = EXDEV; 408 goto done; 409 } 410 #endif 411 412 done: 413 brelse(bp, 0); 414 return (error); 415 } 416 417 static void 418 parttbl_consistency_check(struct disklabel *lp, struct dos_partition *dp) 419 { 420 int i, j; 421 int f = (lp->d_secsize >= 1024) ? lp->d_secsize/1024 : 1; 422 int g = (lp->d_secsize >= 1024) ? 1 : 1024/lp->d_secsize; 423 424 /* 1. overlapping check on partition table */ 425 for (i = 0; i < NDOSPART; i++) { 426 if (dp[i].dp_size == 0) 427 continue; 428 for (j = i+1; j < NDOSPART; j++) { 429 if (dp[j].dp_size == 0) 430 continue; 431 if (((dp[i].dp_start <= dp[j].dp_start) && 432 (dp[i].dp_start + dp[i].dp_size > dp[j].dp_start))|| 433 ((dp[j].dp_start <= dp[i].dp_start) && 434 (dp[j].dp_start + dp[j].dp_size > dp[i].dp_start))) { 435 printf("warning: Human68k partition %d and %d" 436 " are overlapping\n", i+1, j+1); 437 return; 438 } 439 } 440 } 441 442 /* 2. scan disklabel partitions */ 443 #define bp lp->d_partitions 444 for (i = 0; i < lp->d_npartitions; i++) { 445 int c = 0; 446 447 if (lp->d_partitions[i].p_fstype == FS_UNUSED || 448 lp->d_partitions[i].p_size == 0) 449 continue; 450 for (j = 0; j < NDOSPART; j++) { 451 if (dp[j].dp_size == 0) 452 continue; 453 if ((bp[i].p_offset * f < (dp[j].dp_start + dp[j].dp_size) * g) && 454 ((bp[i].p_offset + bp[i].p_size) * f >= (dp[j].dp_start + dp[j].dp_size) * g)) 455 c++; 456 if ((bp[i].p_offset * f > dp[j].dp_start * g) && 457 ((bp[i].p_offset + bp[i].p_size) * f < (dp[j].dp_start + dp[j].dp_size) * g)) 458 c++; 459 if ((bp[i].p_offset * f >= dp[j].dp_start * g) && 460 ((bp[i].p_offset + bp[i].p_size) * f < dp[j].dp_start * g)) 461 c++; 462 } 463 if (c > 1) 464 printf ("warning: partition %c spans for 2 or more" 465 " partitions in Human68k partition table.\n", 466 i+'a'); 467 } 468 #undef bp 469 470 /* more checks? */ 471 } 472
Indexes created Mon Sep 29 21:09:56 GMT 2025