1 /* $NetBSD: disksubr.c,v 1.16 2019/04/03 22:10:52 christos 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 1.16 2019/04/03 22:10:52 christos 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 } 107 108 /* obtain buffer to probe drive with */ 109 bp = geteblk((int)lp->d_secsize); 110 111 /* next, dig out disk label */ 112 bp->b_dev = dev; 113 bp->b_blkno = LABELSECTOR; 114 bp->b_cylinder = 0; 115 bp->b_bcount = lp->d_secsize; 116 bp->b_flags |= B_READ; 117 (*strat)(bp); 118 119 /* if successful, locate disk label within block and validate */ 120 error = biowait(bp); 121 if (error == 0) { 122 /* Save the whole block in case it has info we need. */ 123 memcpy(clp->cd_block, bp->b_data, sizeof(clp->cd_block)); 124 } 125 brelse(bp, 0); 126 if (error) 127 return ("disk label read error"); 128 129 /* Check for a NetBSD disk label at LABELOFFSET */ 130 dlp = (struct disklabel *) (clp->cd_block + LABELOFFSET); 131 if (dlp->d_magic == DISKMAGIC) { 132 if (dkcksum(dlp)) 133 return ("NetBSD disk label corrupted"); 134 *lp = *dlp; 135 return (NULL); 136 } 137 138 /* Check for a Sun disk label (for PROM compatibility). */ 139 slp = (struct sun_disklabel *) clp->cd_block; 140 if (slp->sl_magic == SUN_DKMAGIC) 141 return (disklabel_sun_to_bsd(clp->cd_block, lp)); 142 143 /* 144 * Check for a NetBSD disk label somewhere in LABELSECTOR 145 * (compat with others big-endian boxes) 146 */ 147 for (dlp = (struct disklabel *)clp->cd_block; 148 dlp <= (struct disklabel *)((char *)clp->cd_block + 149 DEV_BSIZE - sizeof(*dlp)); 150 dlp = (struct disklabel *)((char *)dlp + sizeof(long))) { 151 if (dlp->d_magic != DISKMAGIC || dlp->d_magic2 != DISKMAGIC) { 152 continue; 153 } 154 if (dlp->d_npartitions > MAXPARTITIONS || dkcksum(dlp) != 0) 155 return("NetBSD disk label corrupted"); 156 else { 157 *lp = *dlp; 158 return(NULL); 159 } 160 } 161 162 memset(clp->cd_block, 0, sizeof(clp->cd_block)); 163 return NULL; 164 } 165 166 /* 167 * Write disk label back to device after modification. 168 * Current label is already in clp->cd_block[] 169 */ 170 int 171 writedisklabel(dev_t dev, void (*strat)(struct buf *), struct disklabel *lp, struct cpu_disklabel *clp) 172 { 173 struct buf *bp; 174 int error; 175 struct disklabel *dlp; 176 struct sun_disklabel *slp; 177 178 /* 179 * Embed native label in a piece of wasteland. 180 */ 181 if (sizeof(struct disklabel) > sizeof slp->sl_bsdlabel) 182 return EFBIG; 183 184 slp = (struct sun_disklabel *)clp->cd_block; 185 memset(slp->sl_bsdlabel, 0, sizeof(slp->sl_bsdlabel)); 186 dlp = (struct disklabel *)slp->sl_bsdlabel; 187 *dlp = *lp; 188 189 /* Build a SunOS compatible label around the native label */ 190 error = disklabel_bsd_to_sun(lp, clp->cd_block); 191 if (error) 192 return (error); 193 194 /* Get a buffer and copy the new label into it. */ 195 bp = geteblk((int)lp->d_secsize); 196 memcpy(bp->b_data, clp->cd_block, sizeof(clp->cd_block)); 197 198 /* Write out the updated label. */ 199 bp->b_dev = dev; 200 bp->b_blkno = LABELSECTOR; 201 bp->b_cylinder = 0; 202 bp->b_bcount = lp->d_secsize; 203 bp->b_flags |= B_WRITE; 204 (*strat)(bp); 205 error = biowait(bp); 206 brelse(bp, 0); 207 208 return (error); 209 } 210 211 /************************************************************************ 212 * 213 * The rest of this was taken from arch/sparc/scsi/sun_disklabel.c 214 * and then substantially rewritten by Gordon W. Ross 215 * 216 ************************************************************************/ 217 218 /* What partition types to assume for Sun disklabels: */ 219 static u_char 220 sun_fstypes[8] = { 221 FS_BSDFFS, /* a */ 222 FS_SWAP, /* b */ 223 FS_OTHER, /* c - whole disk */ 224 FS_BSDFFS, /* d */ 225 FS_BSDFFS, /* e */ 226 FS_BSDFFS, /* f */ 227 FS_BSDFFS, /* g */ 228 FS_BSDFFS, /* h */ 229 }; 230 231 /* 232 * Given a SunOS disk label, set lp to a BSD disk label. 233 * Returns NULL on success, else an error string. 234 * 235 * The BSD label is cleared out before this is called. 236 */ 237 static const char * 238 disklabel_sun_to_bsd(char *cp, struct disklabel *lp) 239 { 240 struct sun_disklabel *sl; 241 struct partition *npp; 242 struct sun_dkpart *spp; 243 int i, secpercyl; 244 unsigned int secpblck; 245 u_short cksum, *sp1, *sp2; 246 247 sl = (struct sun_disklabel *)cp; 248 249 /* Verify the XOR check. */ 250 sp1 = (u_short *)sl; 251 sp2 = (u_short *)(sl + 1); 252 cksum = 0; 253 while (sp1 < sp2) 254 cksum ^= *sp1++; 255 if (cksum != 0) 256 return("SunOS disk label, bad checksum"); 257 258 /* Format conversion. */ 259 lp->d_magic = DISKMAGIC; 260 lp->d_magic2 = DISKMAGIC; 261 memcpy(lp->d_packname, sl->sl_text, sizeof(lp->d_packname)); 262 263 secpblck = lp->d_secsize / 512; 264 if (secpblck == 0) secpblck = 1; /* can't happen */ 265 lp->d_secsize = 512; 266 lp->d_nsectors = sl->sl_nsectors; 267 lp->d_ntracks = sl->sl_ntracks; 268 lp->d_ncylinders = sl->sl_ncylinders; 269 270 secpercyl = sl->sl_nsectors * sl->sl_ntracks; 271 lp->d_secpercyl = secpercyl; 272 lp->d_secperunit = secpercyl * sl->sl_ncylinders; 273 274 lp->d_sparespercyl = sl->sl_sparespercyl; 275 lp->d_acylinders = sl->sl_acylinders; 276 lp->d_rpm = sl->sl_rpm; 277 lp->d_interleave = sl->sl_interleave; 278 279 lp->d_npartitions = 8; 280 /* These are as defined in <ufs/ffs/fs.h> */ 281 lp->d_bbsize = 8192; /* XXX */ 282 lp->d_sbsize = 8192; /* XXX */ 283 284 for (i = 0; i < 8; i++) { 285 spp = &sl->sl_part[i]; 286 npp = &lp->d_partitions[i]; 287 288 if (npp->p_fstype == FS_ISO9660 289 && spp->sdkp_cyloffset * secpercyl == npp->p_offset*secpblck 290 && spp->sdkp_nsectors <= npp->p_size*secpblck 291 && npp->p_size > 0 && spp->sdkp_nsectors > 0) { 292 /* 293 * This happens for example on sunlabel'd hybrid 294 * (ffs + ISO9660) CDs, like our install CDs. 295 * The cd driver has initialized a valid ISO9660 296 * partition (including session parameters), so 297 * we better not overwrite it. 298 */ 299 npp->p_offset *= secpblck; 300 npp->p_size = spp->sdkp_nsectors; 301 npp->p_cdsession *= secpblck; 302 continue; 303 } 304 npp->p_offset = spp->sdkp_cyloffset * secpercyl; 305 npp->p_size = spp->sdkp_nsectors; 306 if (npp->p_size == 0) { 307 npp->p_fstype = FS_UNUSED; 308 } else { 309 npp->p_fstype = sun_fstypes[i]; 310 if (npp->p_fstype == FS_BSDFFS) { 311 /* 312 * The sun label does not store the FFS fields, 313 * so just set them with default values here. 314 */ 315 npp->p_fsize = 1024; 316 npp->p_frag = 8; 317 npp->p_cpg = 16; 318 } 319 } 320 } 321 322 lp->d_checksum = 0; 323 lp->d_checksum = dkcksum(lp); 324 return (NULL); 325 } 326 327 /* 328 * Given a BSD disk label, update the Sun disklabel 329 * pointed to by cp with the new info. Note that the 330 * Sun disklabel may have other info we need to keep. 331 * Returns zero or error code. 332 */ 333 static int 334 disklabel_bsd_to_sun(struct disklabel *lp, char *cp) 335 { 336 struct sun_disklabel *sl; 337 struct partition *npp; 338 struct sun_dkpart *spp; 339 int i, secpercyl; 340 u_short cksum, *sp1, *sp2; 341 342 if (lp->d_secsize != 512) 343 return (EINVAL); 344 345 sl = (struct sun_disklabel *)cp; 346 347 /* 348 * Format conversion. 349 */ 350 memcpy(sl->sl_text, lp->d_packname, sizeof(lp->d_packname)); 351 sl->sl_rpm = lp->d_rpm; 352 sl->sl_pcylinders = lp->d_ncylinders + lp->d_acylinders; /* XXX */ 353 sl->sl_sparespercyl = lp->d_sparespercyl; 354 sl->sl_interleave = lp->d_interleave; 355 sl->sl_ncylinders = lp->d_ncylinders; 356 sl->sl_acylinders = lp->d_acylinders; 357 sl->sl_ntracks = lp->d_ntracks; 358 sl->sl_nsectors = lp->d_nsectors; 359 360 secpercyl = sl->sl_nsectors * sl->sl_ntracks; 361 for (i = 0; i < 8; i++) { 362 spp = &sl->sl_part[i]; 363 npp = &lp->d_partitions[i]; 364 365 /* 366 * SunOS partitions must start on a cylinder boundary. 367 * Note this restriction is forced upon NetBSD/sparc 368 * labels too, since we want to keep both labels 369 * synchronised. 370 */ 371 if (npp->p_offset % secpercyl) 372 return (EINVAL); 373 spp->sdkp_cyloffset = npp->p_offset / secpercyl; 374 spp->sdkp_nsectors = npp->p_size; 375 } 376 sl->sl_magic = SUN_DKMAGIC; 377 378 /* Compute the XOR check. */ 379 sp1 = (u_short *)sl; 380 sp2 = (u_short *)(sl + 1); 381 sl->sl_cksum = cksum = 0; 382 while (sp1 < sp2) 383 cksum ^= *sp1++; 384 sl->sl_cksum = cksum; 385 386 return (0); 387 } 388 389 /* 390 * Search the bad sector table looking for the specified sector. 391 * Return index if found. 392 * Return -1 if not found. 393 */ 394 int 395 isbad(struct dkbad *bt, int cyl, int trk, int sec) 396 { 397 int i; 398 long blk, bblk; 399 400 blk = ((long)cyl << 16) + (trk << 8) + sec; 401 for (i = 0; i < 126; i++) { 402 bblk = ((long)bt->bt_bad[i].bt_cyl << 16) + 403 bt->bt_bad[i].bt_trksec; 404 if (blk == bblk) 405 return (i); 406 if (blk < bblk || bblk < 0) 407 break; 408 } 409 return (-1); 410 } 411