disksubr.c revision 1.9
1 /* $NetBSD: disksubr.c,v 1.9 2007/10/08 20:12:05 ad 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 1.9 2007/10/08 20:12:05 ad 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, strat, lp, clp) 92 dev_t dev; 93 void (*strat)(struct buf *); 94 struct disklabel *lp; 95 struct cpu_disklabel *clp; 96 { 97 struct buf *bp; 98 struct disklabel *dlp; 99 struct sun_disklabel *slp; 100 int error; 101 102 /* minimal requirements for archtypal disk label */ 103 if (lp->d_secperunit == 0) 104 lp->d_secperunit = 0x1fffffff; 105 if (lp->d_npartitions == 0) { 106 lp->d_npartitions = RAW_PART + 1; 107 if (lp->d_partitions[RAW_PART].p_size == 0) 108 lp->d_partitions[RAW_PART].p_size = 0x1fffffff; 109 lp->d_partitions[RAW_PART].p_offset = 0; 110 } 111 112 /* obtain buffer to probe drive with */ 113 bp = geteblk((int)lp->d_secsize); 114 115 /* next, dig out disk label */ 116 bp->b_dev = dev; 117 bp->b_blkno = LABELSECTOR; 118 bp->b_cylinder = 0; 119 bp->b_bcount = lp->d_secsize; 120 bp->b_flags |= B_READ; 121 (*strat)(bp); 122 123 /* if successful, locate disk label within block and validate */ 124 error = biowait(bp); 125 if (error == 0) { 126 /* Save the whole block in case it has info we need. */ 127 memcpy(clp->cd_block, bp->b_data, sizeof(clp->cd_block)); 128 } 129 brelse(bp, 0); 130 if (error) 131 return ("disk label read error"); 132 133 /* Check for a NetBSD disk label at LABELOFFSET */ 134 dlp = (struct disklabel *) (clp->cd_block + LABELOFFSET); 135 if (dlp->d_magic == DISKMAGIC) { 136 if (dkcksum(dlp)) 137 return ("NetBSD disk label corrupted"); 138 *lp = *dlp; 139 return (NULL); 140 } 141 142 /* Check for a Sun disk label (for PROM compatibility). */ 143 slp = (struct sun_disklabel *) clp->cd_block; 144 if (slp->sl_magic == SUN_DKMAGIC) 145 return (disklabel_sun_to_bsd(clp->cd_block, lp)); 146 147 /* 148 * Check for a NetBSD disk label somewhere in LABELSECTOR 149 * (compat with others big-endian boxes) 150 */ 151 for (dlp = (struct disklabel *)clp->cd_block; 152 dlp <= (struct disklabel *)((char *)clp->cd_block + 153 DEV_BSIZE - sizeof(*dlp)); 154 dlp = (struct disklabel *)((char *)dlp + sizeof(long))) { 155 if (dlp->d_magic != DISKMAGIC || dlp->d_magic2 != DISKMAGIC) { 156 continue; 157 } 158 if (dlp->d_npartitions > MAXPARTITIONS || dkcksum(dlp) != 0) 159 return("NetBSD disk label corrupted"); 160 else { 161 *lp = *dlp; 162 return(NULL); 163 } 164 } 165 166 memset(clp->cd_block, 0, sizeof(clp->cd_block)); 167 return ("no disk label"); 168 } 169 170 /* 171 * Check new disk label for sensibility 172 * before setting it. 173 */ 174 int 175 setdisklabel(olp, nlp, openmask, clp) 176 struct disklabel *olp, *nlp; 177 u_long openmask; 178 struct cpu_disklabel *clp; 179 { 180 int i; 181 struct partition *opp, *npp; 182 183 /* sanity clause */ 184 if (nlp->d_secpercyl == 0 || nlp->d_secsize == 0 || 185 (nlp->d_secsize % DEV_BSIZE) != 0) 186 return(EINVAL); 187 188 /* special case to allow disklabel to be invalidated */ 189 if (nlp->d_magic == 0xffffffff) { 190 *olp = *nlp; 191 return (0); 192 } 193 194 if (nlp->d_magic != DISKMAGIC || nlp->d_magic2 != DISKMAGIC || 195 dkcksum(nlp) != 0) 196 return (EINVAL); 197 198 while ((i = ffs(openmask)) != 0) { 199 i--; 200 openmask &= ~(1 << i); 201 if (nlp->d_npartitions <= i) 202 return (EBUSY); 203 opp = &olp->d_partitions[i]; 204 npp = &nlp->d_partitions[i]; 205 if (npp->p_offset != opp->p_offset || npp->p_size < opp->p_size) 206 return (EBUSY); 207 } 208 209 *olp = *nlp; 210 return (0); 211 } 212 213 /* 214 * Write disk label back to device after modification. 215 * Current label is already in clp->cd_block[] 216 */ 217 int 218 writedisklabel(dev, strat, lp, clp) 219 dev_t dev; 220 void (*strat)(struct buf *); 221 struct disklabel *lp; 222 struct cpu_disklabel *clp; 223 { 224 struct buf *bp; 225 int error; 226 struct disklabel *dlp; 227 struct sun_disklabel *slp; 228 229 /* 230 * Embed native label in a piece of wasteland. 231 */ 232 if (sizeof(struct disklabel) > sizeof slp->sl_bsdlabel) 233 return EFBIG; 234 235 slp = (struct sun_disklabel *)clp->cd_block; 236 memset(slp->sl_bsdlabel, 0, sizeof(slp->sl_bsdlabel)); 237 dlp = (struct disklabel *)slp->sl_bsdlabel; 238 *dlp = *lp; 239 240 /* Build a SunOS compatible label around the native label */ 241 error = disklabel_bsd_to_sun(lp, clp->cd_block); 242 if (error) 243 return (error); 244 245 /* Get a buffer and copy the new label into it. */ 246 bp = geteblk((int)lp->d_secsize); 247 memcpy(bp->b_data, clp->cd_block, sizeof(clp->cd_block)); 248 249 /* Write out the updated label. */ 250 bp->b_dev = dev; 251 bp->b_blkno = LABELSECTOR; 252 bp->b_cylinder = 0; 253 bp->b_bcount = lp->d_secsize; 254 bp->b_flags |= B_WRITE; 255 (*strat)(bp); 256 error = biowait(bp); 257 brelse(bp, 0); 258 259 return (error); 260 } 261 262 /************************************************************************ 263 * 264 * The rest of this was taken from arch/sparc/scsi/sun_disklabel.c 265 * and then substantially rewritten by Gordon W. Ross 266 * 267 ************************************************************************/ 268 269 /* What partition types to assume for Sun disklabels: */ 270 static u_char 271 sun_fstypes[8] = { 272 FS_BSDFFS, /* a */ 273 FS_SWAP, /* b */ 274 FS_OTHER, /* c - whole disk */ 275 FS_BSDFFS, /* d */ 276 FS_BSDFFS, /* e */ 277 FS_BSDFFS, /* f */ 278 FS_BSDFFS, /* g */ 279 FS_BSDFFS, /* h */ 280 }; 281 282 /* 283 * Given a SunOS disk label, set lp to a BSD disk label. 284 * Returns NULL on success, else an error string. 285 * 286 * The BSD label is cleared out before this is called. 287 */ 288 static const char * 289 disklabel_sun_to_bsd(cp, lp) 290 char *cp; 291 struct disklabel *lp; 292 { 293 struct sun_disklabel *sl; 294 struct partition *npp; 295 struct sun_dkpart *spp; 296 int i, secpercyl; 297 u_short cksum, *sp1, *sp2; 298 299 sl = (struct sun_disklabel *)cp; 300 301 /* Verify the XOR check. */ 302 sp1 = (u_short *)sl; 303 sp2 = (u_short *)(sl + 1); 304 cksum = 0; 305 while (sp1 < sp2) 306 cksum ^= *sp1++; 307 if (cksum != 0) 308 return("SunOS disk label, bad checksum"); 309 310 /* Format conversion. */ 311 lp->d_magic = DISKMAGIC; 312 lp->d_magic2 = DISKMAGIC; 313 memcpy(lp->d_packname, sl->sl_text, sizeof(lp->d_packname)); 314 315 lp->d_secsize = 512; 316 lp->d_nsectors = sl->sl_nsectors; 317 lp->d_ntracks = sl->sl_ntracks; 318 lp->d_ncylinders = sl->sl_ncylinders; 319 320 secpercyl = sl->sl_nsectors * sl->sl_ntracks; 321 lp->d_secpercyl = secpercyl; 322 lp->d_secperunit = secpercyl * sl->sl_ncylinders; 323 324 lp->d_sparespercyl = sl->sl_sparespercyl; 325 lp->d_acylinders = sl->sl_acylinders; 326 lp->d_rpm = sl->sl_rpm; 327 lp->d_interleave = sl->sl_interleave; 328 329 lp->d_npartitions = 8; 330 /* These are as defined in <ufs/ffs/fs.h> */ 331 lp->d_bbsize = 8192; /* XXX */ 332 lp->d_sbsize = 8192; /* XXX */ 333 334 for (i = 0; i < 8; i++) { 335 spp = &sl->sl_part[i]; 336 npp = &lp->d_partitions[i]; 337 npp->p_offset = spp->sdkp_cyloffset * secpercyl; 338 npp->p_size = spp->sdkp_nsectors; 339 if (npp->p_size == 0) { 340 npp->p_fstype = FS_UNUSED; 341 } else { 342 npp->p_fstype = sun_fstypes[i]; 343 if (npp->p_fstype == FS_BSDFFS) { 344 /* 345 * The sun label does not store the FFS fields, 346 * so just set them with default values here. 347 */ 348 npp->p_fsize = 1024; 349 npp->p_frag = 8; 350 npp->p_cpg = 16; 351 } 352 } 353 } 354 355 lp->d_checksum = 0; 356 lp->d_checksum = dkcksum(lp); 357 return (NULL); 358 } 359 360 /* 361 * Given a BSD disk label, update the Sun disklabel 362 * pointed to by cp with the new info. Note that the 363 * Sun disklabel may have other info we need to keep. 364 * Returns zero or error code. 365 */ 366 static int 367 disklabel_bsd_to_sun(lp, cp) 368 struct disklabel *lp; 369 char *cp; 370 { 371 struct sun_disklabel *sl; 372 struct partition *npp; 373 struct sun_dkpart *spp; 374 int i, secpercyl; 375 u_short cksum, *sp1, *sp2; 376 377 if (lp->d_secsize != 512) 378 return (EINVAL); 379 380 sl = (struct sun_disklabel *)cp; 381 382 /* 383 * Format conversion. 384 */ 385 memcpy(sl->sl_text, lp->d_packname, sizeof(lp->d_packname)); 386 sl->sl_rpm = lp->d_rpm; 387 sl->sl_pcylinders = lp->d_ncylinders + lp->d_acylinders; /* XXX */ 388 sl->sl_sparespercyl = lp->d_sparespercyl; 389 sl->sl_interleave = lp->d_interleave; 390 sl->sl_ncylinders = lp->d_ncylinders; 391 sl->sl_acylinders = lp->d_acylinders; 392 sl->sl_ntracks = lp->d_ntracks; 393 sl->sl_nsectors = lp->d_nsectors; 394 395 secpercyl = sl->sl_nsectors * sl->sl_ntracks; 396 for (i = 0; i < 8; i++) { 397 spp = &sl->sl_part[i]; 398 npp = &lp->d_partitions[i]; 399 400 /* 401 * SunOS partitions must start on a cylinder boundary. 402 * Note this restriction is forced upon NetBSD/sparc 403 * labels too, since we want to keep both labels 404 * synchronised. 405 */ 406 if (npp->p_offset % secpercyl) 407 return (EINVAL); 408 spp->sdkp_cyloffset = npp->p_offset / secpercyl; 409 spp->sdkp_nsectors = npp->p_size; 410 } 411 sl->sl_magic = SUN_DKMAGIC; 412 413 /* Compute the XOR check. */ 414 sp1 = (u_short *)sl; 415 sp2 = (u_short *)(sl + 1); 416 sl->sl_cksum = cksum = 0; 417 while (sp1 < sp2) 418 cksum ^= *sp1++; 419 sl->sl_cksum = cksum; 420 421 return (0); 422 } 423 424 /* 425 * Search the bad sector table looking for the specified sector. 426 * Return index if found. 427 * Return -1 if not found. 428 */ 429 int 430 isbad(bt, cyl, trk, sec) 431 struct dkbad *bt; 432 int cyl, trk, sec; 433 { 434 int i; 435 long blk, bblk; 436 437 blk = ((long)cyl << 16) + (trk << 8) + sec; 438 for (i = 0; i < 126; i++) { 439 bblk = ((long)bt->bt_bad[i].bt_cyl << 16) + 440 bt->bt_bad[i].bt_trksec; 441 if (blk == bblk) 442 return (i); 443 if (blk < bblk || bblk < 0) 444 break; 445 } 446 return (-1); 447 } 448
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