1 /* $NetBSD: disksubr.c,v 1.17 2020/05/03 06:31:02 jdc 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 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 /* 32 * Copyright (c) 1994, 1995 Gordon W. Ross 33 * Copyright (c) 1994 Theo de Raadt 34 * All rights reserved. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions 38 * are met: 39 * 1. Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * 2. Redistributions in binary form must reproduce the above copyright 42 * notice, this list of conditions and the following disclaimer in the 43 * documentation and/or other materials provided with the distribution. 44 * 45 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 46 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 47 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 48 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 49 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 50 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 51 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 52 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 53 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 54 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 55 */ 56 57 #include <sys/cdefs.h> 58 __KERNEL_RCSID(0, "$NetBSD: disksubr.c,v 1.17 2020/05/03 06:31:02 jdc Exp $"); 59 60 #include <sys/param.h> 61 #include <sys/systm.h> 62 #include <sys/buf.h> 63 #include <sys/ioccom.h> 64 #include <sys/device.h> 65 #include <sys/disklabel.h> 66 #include <sys/disk.h> 67 #include <sys/dkbad.h> 68 69 #include <dev/sun/disklabel.h> 70 71 #if LABELSECTOR != 0 72 #error "Default value of LABELSECTOR no longer zero?" 73 #endif 74 75 static const char *disklabel_sun_to_bsd(char *, struct disklabel *); 76 static int disklabel_bsd_to_sun(struct disklabel *, char *); 77 78 /* 79 * Attempt to read a disk label from a device 80 * using the indicated strategy routine. 81 * The label must be partly set up before this: 82 * secpercyl, secsize and anything required for a block i/o read 83 * operation in the driver's strategy/start routines 84 * must be filled in before calling us. 85 * 86 * Return buffer for use in signalling errors if requested. 87 * 88 * Returns null on success and an error string on failure. 89 */ 90 const char * 91 readdisklabel(dev_t dev, void (*strat)(struct buf *), struct disklabel *lp, struct cpu_disklabel *clp) 92 { 93 struct buf *bp; 94 struct disklabel *dlp; 95 struct sun_disklabel *slp; 96 int error; 97 98 /* minimal requirements for archtypal disk label */ 99 if (lp->d_secperunit == 0) 100 lp->d_secperunit = 0x1fffffff; 101 if (lp->d_npartitions == 0) { 102 lp->d_npartitions = RAW_PART + 1; 103 if (lp->d_partitions[RAW_PART].p_size == 0) 104 lp->d_partitions[RAW_PART].p_size = 0x1fffffff; 105 lp->d_partitions[RAW_PART].p_offset = 0; 106 } 107 if (lp->d_secsize == 0) 108 return ("sector size 0"); 109 110 /* obtain buffer to probe drive with */ 111 bp = geteblk((int)lp->d_secsize); 112 113 /* next, dig out disk label */ 114 bp->b_dev = dev; 115 bp->b_blkno = LABELSECTOR; 116 bp->b_cylinder = 0; 117 bp->b_bcount = lp->d_secsize; 118 bp->b_flags |= B_READ; 119 (*strat)(bp); 120 121 /* if successful, locate disk label within block and validate */ 122 error = biowait(bp); 123 if (error == 0) { 124 /* Save the whole block in case it has info we need. */ 125 memcpy(clp->cd_block, bp->b_data, sizeof(clp->cd_block)); 126 } 127 brelse(bp, 0); 128 if (error) 129 return ("disk label read error"); 130 131 /* Check for a NetBSD disk label at LABELOFFSET */ 132 dlp = (struct disklabel *) (clp->cd_block + LABELOFFSET); 133 if (dlp->d_magic == DISKMAGIC) { 134 if (dkcksum(dlp)) 135 return ("NetBSD disk label corrupted"); 136 *lp = *dlp; 137 return (NULL); 138 } 139 140 /* Check for a Sun disk label (for PROM compatibility). */ 141 slp = (struct sun_disklabel *) clp->cd_block; 142 if (slp->sl_magic == SUN_DKMAGIC) 143 return (disklabel_sun_to_bsd(clp->cd_block, lp)); 144 145 /* 146 * Check for a NetBSD disk label somewhere in LABELSECTOR 147 * (compat with others big-endian boxes) 148 */ 149 for (dlp = (struct disklabel *)clp->cd_block; 150 dlp <= (struct disklabel *)((char *)clp->cd_block + 151 DEV_BSIZE - sizeof(*dlp)); 152 dlp = (struct disklabel *)((char *)dlp + sizeof(long))) { 153 if (dlp->d_magic != DISKMAGIC || dlp->d_magic2 != DISKMAGIC) { 154 continue; 155 } 156 if (dlp->d_npartitions > MAXPARTITIONS || dkcksum(dlp) != 0) 157 return("NetBSD disk label corrupted"); 158 else { 159 *lp = *dlp; 160 return(NULL); 161 } 162 } 163 164 memset(clp->cd_block, 0, sizeof(clp->cd_block)); 165 return NULL; 166 } 167 168 /* 169 * Write disk label back to device after modification. 170 * Current label is already in clp->cd_block[] 171 */ 172 int 173 writedisklabel(dev_t dev, void (*strat)(struct buf *), struct disklabel *lp, struct cpu_disklabel *clp) 174 { 175 struct buf *bp; 176 int error; 177 struct disklabel *dlp; 178 struct sun_disklabel *slp; 179 180 /* 181 * Embed native label in a piece of wasteland. 182 */ 183 if (sizeof(struct disklabel) > sizeof slp->sl_bsdlabel) 184 return EFBIG; 185 186 slp = (struct sun_disklabel *)clp->cd_block; 187 memset(slp->sl_bsdlabel, 0, sizeof(slp->sl_bsdlabel)); 188 dlp = (struct disklabel *)slp->sl_bsdlabel; 189 *dlp = *lp; 190 191 /* Build a SunOS compatible label around the native label */ 192 error = disklabel_bsd_to_sun(lp, clp->cd_block); 193 if (error) 194 return (error); 195 196 /* Get a buffer and copy the new label into it. */ 197 bp = geteblk((int)lp->d_secsize); 198 memcpy(bp->b_data, clp->cd_block, sizeof(clp->cd_block)); 199 200 /* Write out the updated label. */ 201 bp->b_dev = dev; 202 bp->b_blkno = LABELSECTOR; 203 bp->b_cylinder = 0; 204 bp->b_bcount = lp->d_secsize; 205 bp->b_flags |= B_WRITE; 206 (*strat)(bp); 207 error = biowait(bp); 208 brelse(bp, 0); 209 210 return (error); 211 } 212 213 /************************************************************************ 214 * 215 * The rest of this was taken from arch/sparc/scsi/sun_disklabel.c 216 * and then substantially rewritten by Gordon W. Ross 217 * 218 ************************************************************************/ 219 220 /* What partition types to assume for Sun disklabels: */ 221 static u_char 222 sun_fstypes[8] = { 223 FS_BSDFFS, /* a */ 224 FS_SWAP, /* b */ 225 FS_OTHER, /* c - whole disk */ 226 FS_BSDFFS, /* d */ 227 FS_BSDFFS, /* e */ 228 FS_BSDFFS, /* f */ 229 FS_BSDFFS, /* g */ 230 FS_BSDFFS, /* h */ 231 }; 232 233 /* 234 * Given a SunOS disk label, set lp to a BSD disk label. 235 * Returns NULL on success, else an error string. 236 * 237 * The BSD label is cleared out before this is called. 238 */ 239 static const char * 240 disklabel_sun_to_bsd(char *cp, struct disklabel *lp) 241 { 242 struct sun_disklabel *sl; 243 struct partition *npp; 244 struct sun_dkpart *spp; 245 int i, secpercyl; 246 unsigned int secpblck; 247 u_short cksum, *sp1, *sp2; 248 249 sl = (struct sun_disklabel *)cp; 250 251 /* Verify the XOR check. */ 252 sp1 = (u_short *)sl; 253 sp2 = (u_short *)(sl + 1); 254 cksum = 0; 255 while (sp1 < sp2) 256 cksum ^= *sp1++; 257 if (cksum != 0) 258 return("SunOS disk label, bad checksum"); 259 260 /* Format conversion. */ 261 lp->d_magic = DISKMAGIC; 262 lp->d_magic2 = DISKMAGIC; 263 memcpy(lp->d_packname, sl->sl_text, sizeof(lp->d_packname)); 264 265 secpblck = lp->d_secsize / 512; 266 if (secpblck == 0) secpblck = 1; /* can't happen */ 267 lp->d_secsize = 512; 268 lp->d_nsectors = sl->sl_nsectors; 269 lp->d_ntracks = sl->sl_ntracks; 270 lp->d_ncylinders = sl->sl_ncylinders; 271 272 secpercyl = sl->sl_nsectors * sl->sl_ntracks; 273 lp->d_secpercyl = secpercyl; 274 lp->d_secperunit = secpercyl * sl->sl_ncylinders; 275 276 lp->d_sparespercyl = sl->sl_sparespercyl; 277 lp->d_acylinders = sl->sl_acylinders; 278 lp->d_rpm = sl->sl_rpm; 279 lp->d_interleave = sl->sl_interleave; 280 281 lp->d_npartitions = 8; 282 /* These are as defined in <ufs/ffs/fs.h> */ 283 lp->d_bbsize = 8192; /* XXX */ 284 lp->d_sbsize = 8192; /* XXX */ 285 286 for (i = 0; i < 8; i++) { 287 spp = &sl->sl_part[i]; 288 npp = &lp->d_partitions[i]; 289 290 if (npp->p_fstype == FS_ISO9660 291 && spp->sdkp_cyloffset * secpercyl == npp->p_offset*secpblck 292 && spp->sdkp_nsectors <= npp->p_size*secpblck 293 && npp->p_size > 0 && spp->sdkp_nsectors > 0) { 294 /* 295 * This happens for example on sunlabel'd hybrid 296 * (ffs + ISO9660) CDs, like our install CDs. 297 * The cd driver has initialized a valid ISO9660 298 * partition (including session parameters), so 299 * we better not overwrite it. 300 */ 301 npp->p_offset *= secpblck; 302 npp->p_size = spp->sdkp_nsectors; 303 npp->p_cdsession *= secpblck; 304 continue; 305 } 306 npp->p_offset = spp->sdkp_cyloffset * secpercyl; 307 npp->p_size = spp->sdkp_nsectors; 308 if (npp->p_size == 0) { 309 npp->p_fstype = FS_UNUSED; 310 } else { 311 npp->p_fstype = sun_fstypes[i]; 312 if (npp->p_fstype == FS_BSDFFS) { 313 /* 314 * The sun label does not store the FFS fields, 315 * so just set them with default values here. 316 */ 317 npp->p_fsize = 1024; 318 npp->p_frag = 8; 319 npp->p_cpg = 16; 320 } 321 } 322 } 323 324 lp->d_checksum = 0; 325 lp->d_checksum = dkcksum(lp); 326 return (NULL); 327 } 328 329 /* 330 * Given a BSD disk label, update the Sun disklabel 331 * pointed to by cp with the new info. Note that the 332 * Sun disklabel may have other info we need to keep. 333 * Returns zero or error code. 334 */ 335 static int 336 disklabel_bsd_to_sun(struct disklabel *lp, char *cp) 337 { 338 struct sun_disklabel *sl; 339 struct partition *npp; 340 struct sun_dkpart *spp; 341 int i, secpercyl; 342 u_short cksum, *sp1, *sp2; 343 344 if (lp->d_secsize != 512) 345 return (EINVAL); 346 347 sl = (struct sun_disklabel *)cp; 348 349 /* 350 * Format conversion. 351 */ 352 memcpy(sl->sl_text, lp->d_packname, sizeof(lp->d_packname)); 353 sl->sl_rpm = lp->d_rpm; 354 sl->sl_pcylinders = lp->d_ncylinders + lp->d_acylinders; /* XXX */ 355 sl->sl_sparespercyl = lp->d_sparespercyl; 356 sl->sl_interleave = lp->d_interleave; 357 sl->sl_ncylinders = lp->d_ncylinders; 358 sl->sl_acylinders = lp->d_acylinders; 359 sl->sl_ntracks = lp->d_ntracks; 360 sl->sl_nsectors = lp->d_nsectors; 361 362 secpercyl = sl->sl_nsectors * sl->sl_ntracks; 363 for (i = 0; i < 8; i++) { 364 spp = &sl->sl_part[i]; 365 npp = &lp->d_partitions[i]; 366 367 /* 368 * SunOS partitions must start on a cylinder boundary. 369 * Note this restriction is forced upon NetBSD/sparc 370 * labels too, since we want to keep both labels 371 * synchronised. 372 */ 373 if (npp->p_offset % secpercyl) 374 return (EINVAL); 375 spp->sdkp_cyloffset = npp->p_offset / secpercyl; 376 spp->sdkp_nsectors = npp->p_size; 377 } 378 sl->sl_magic = SUN_DKMAGIC; 379 380 /* Compute the XOR check. */ 381 sp1 = (u_short *)sl; 382 sp2 = (u_short *)(sl + 1); 383 sl->sl_cksum = cksum = 0; 384 while (sp1 < sp2) 385 cksum ^= *sp1++; 386 sl->sl_cksum = cksum; 387 388 return (0); 389 } 390 391 /* 392 * Search the bad sector table looking for the specified sector. 393 * Return index if found. 394 * Return -1 if not found. 395 */ 396 int 397 isbad(struct dkbad *bt, int cyl, int trk, int sec) 398 { 399 int i; 400 long blk, bblk; 401 402 blk = ((long)cyl << 16) + (trk << 8) + sec; 403 for (i = 0; i < 126; i++) { 404 bblk = ((long)bt->bt_bad[i].bt_cyl << 16) + 405 bt->bt_bad[i].bt_trksec; 406 if (blk == bblk) 407 return (i); 408 if (blk < bblk || bblk < 0) 409 break; 410 } 411 return (-1); 412 } 413
Indexes created Thu Sep 25 16:09:42 GMT 2025