disksubr.c revision 1.11
1 /* $NetBSD: disksubr.c,v 1.11 2009/03/14 21:04:23 dsl 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 1.11 2009/03/14 21:04:23 dsl 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(struct disklabel *olp, struct disklabel *nlp, u_long openmask, struct cpu_disklabel *clp) 176 { 177 int i; 178 struct partition *opp, *npp; 179 180 /* sanity clause */ 181 if (nlp->d_secpercyl == 0 || nlp->d_secsize == 0 || 182 (nlp->d_secsize % DEV_BSIZE) != 0) 183 return(EINVAL); 184 185 /* special case to allow disklabel to be invalidated */ 186 if (nlp->d_magic == 0xffffffff) { 187 *olp = *nlp; 188 return (0); 189 } 190 191 if (nlp->d_magic != DISKMAGIC || nlp->d_magic2 != DISKMAGIC || 192 dkcksum(nlp) != 0) 193 return (EINVAL); 194 195 while ((i = ffs(openmask)) != 0) { 196 i--; 197 openmask &= ~(1 << i); 198 if (nlp->d_npartitions <= i) 199 return (EBUSY); 200 opp = &olp->d_partitions[i]; 201 npp = &nlp->d_partitions[i]; 202 if (npp->p_offset != opp->p_offset || npp->p_size < opp->p_size) 203 return (EBUSY); 204 } 205 206 *olp = *nlp; 207 return (0); 208 } 209 210 /* 211 * Write disk label back to device after modification. 212 * Current label is already in clp->cd_block[] 213 */ 214 int 215 writedisklabel(dev, strat, lp, clp) 216 dev_t dev; 217 void (*strat)(struct buf *); 218 struct disklabel *lp; 219 struct cpu_disklabel *clp; 220 { 221 struct buf *bp; 222 int error; 223 struct disklabel *dlp; 224 struct sun_disklabel *slp; 225 226 /* 227 * Embed native label in a piece of wasteland. 228 */ 229 if (sizeof(struct disklabel) > sizeof slp->sl_bsdlabel) 230 return EFBIG; 231 232 slp = (struct sun_disklabel *)clp->cd_block; 233 memset(slp->sl_bsdlabel, 0, sizeof(slp->sl_bsdlabel)); 234 dlp = (struct disklabel *)slp->sl_bsdlabel; 235 *dlp = *lp; 236 237 /* Build a SunOS compatible label around the native label */ 238 error = disklabel_bsd_to_sun(lp, clp->cd_block); 239 if (error) 240 return (error); 241 242 /* Get a buffer and copy the new label into it. */ 243 bp = geteblk((int)lp->d_secsize); 244 memcpy(bp->b_data, clp->cd_block, sizeof(clp->cd_block)); 245 246 /* Write out the updated label. */ 247 bp->b_dev = dev; 248 bp->b_blkno = LABELSECTOR; 249 bp->b_cylinder = 0; 250 bp->b_bcount = lp->d_secsize; 251 bp->b_flags |= B_WRITE; 252 (*strat)(bp); 253 error = biowait(bp); 254 brelse(bp, 0); 255 256 return (error); 257 } 258 259 /************************************************************************ 260 * 261 * The rest of this was taken from arch/sparc/scsi/sun_disklabel.c 262 * and then substantially rewritten by Gordon W. Ross 263 * 264 ************************************************************************/ 265 266 /* What partition types to assume for Sun disklabels: */ 267 static u_char 268 sun_fstypes[8] = { 269 FS_BSDFFS, /* a */ 270 FS_SWAP, /* b */ 271 FS_OTHER, /* c - whole disk */ 272 FS_BSDFFS, /* d */ 273 FS_BSDFFS, /* e */ 274 FS_BSDFFS, /* f */ 275 FS_BSDFFS, /* g */ 276 FS_BSDFFS, /* h */ 277 }; 278 279 /* 280 * Given a SunOS disk label, set lp to a BSD disk label. 281 * Returns NULL on success, else an error string. 282 * 283 * The BSD label is cleared out before this is called. 284 */ 285 static const char * 286 disklabel_sun_to_bsd(char *cp, struct disklabel *lp) 287 { 288 struct sun_disklabel *sl; 289 struct partition *npp; 290 struct sun_dkpart *spp; 291 int i, secpercyl; 292 u_short cksum, *sp1, *sp2; 293 294 sl = (struct sun_disklabel *)cp; 295 296 /* Verify the XOR check. */ 297 sp1 = (u_short *)sl; 298 sp2 = (u_short *)(sl + 1); 299 cksum = 0; 300 while (sp1 < sp2) 301 cksum ^= *sp1++; 302 if (cksum != 0) 303 return("SunOS disk label, bad checksum"); 304 305 /* Format conversion. */ 306 lp->d_magic = DISKMAGIC; 307 lp->d_magic2 = DISKMAGIC; 308 memcpy(lp->d_packname, sl->sl_text, sizeof(lp->d_packname)); 309 310 lp->d_secsize = 512; 311 lp->d_nsectors = sl->sl_nsectors; 312 lp->d_ntracks = sl->sl_ntracks; 313 lp->d_ncylinders = sl->sl_ncylinders; 314 315 secpercyl = sl->sl_nsectors * sl->sl_ntracks; 316 lp->d_secpercyl = secpercyl; 317 lp->d_secperunit = secpercyl * sl->sl_ncylinders; 318 319 lp->d_sparespercyl = sl->sl_sparespercyl; 320 lp->d_acylinders = sl->sl_acylinders; 321 lp->d_rpm = sl->sl_rpm; 322 lp->d_interleave = sl->sl_interleave; 323 324 lp->d_npartitions = 8; 325 /* These are as defined in <ufs/ffs/fs.h> */ 326 lp->d_bbsize = 8192; /* XXX */ 327 lp->d_sbsize = 8192; /* XXX */ 328 329 for (i = 0; i < 8; i++) { 330 spp = &sl->sl_part[i]; 331 npp = &lp->d_partitions[i]; 332 npp->p_offset = spp->sdkp_cyloffset * secpercyl; 333 npp->p_size = spp->sdkp_nsectors; 334 if (npp->p_size == 0) { 335 npp->p_fstype = FS_UNUSED; 336 } else { 337 npp->p_fstype = sun_fstypes[i]; 338 if (npp->p_fstype == FS_BSDFFS) { 339 /* 340 * The sun label does not store the FFS fields, 341 * so just set them with default values here. 342 */ 343 npp->p_fsize = 1024; 344 npp->p_frag = 8; 345 npp->p_cpg = 16; 346 } 347 } 348 } 349 350 lp->d_checksum = 0; 351 lp->d_checksum = dkcksum(lp); 352 return (NULL); 353 } 354 355 /* 356 * Given a BSD disk label, update the Sun disklabel 357 * pointed to by cp with the new info. Note that the 358 * Sun disklabel may have other info we need to keep. 359 * Returns zero or error code. 360 */ 361 static int 362 disklabel_bsd_to_sun(struct disklabel *lp, char *cp) 363 { 364 struct sun_disklabel *sl; 365 struct partition *npp; 366 struct sun_dkpart *spp; 367 int i, secpercyl; 368 u_short cksum, *sp1, *sp2; 369 370 if (lp->d_secsize != 512) 371 return (EINVAL); 372 373 sl = (struct sun_disklabel *)cp; 374 375 /* 376 * Format conversion. 377 */ 378 memcpy(sl->sl_text, lp->d_packname, sizeof(lp->d_packname)); 379 sl->sl_rpm = lp->d_rpm; 380 sl->sl_pcylinders = lp->d_ncylinders + lp->d_acylinders; /* XXX */ 381 sl->sl_sparespercyl = lp->d_sparespercyl; 382 sl->sl_interleave = lp->d_interleave; 383 sl->sl_ncylinders = lp->d_ncylinders; 384 sl->sl_acylinders = lp->d_acylinders; 385 sl->sl_ntracks = lp->d_ntracks; 386 sl->sl_nsectors = lp->d_nsectors; 387 388 secpercyl = sl->sl_nsectors * sl->sl_ntracks; 389 for (i = 0; i < 8; i++) { 390 spp = &sl->sl_part[i]; 391 npp = &lp->d_partitions[i]; 392 393 /* 394 * SunOS partitions must start on a cylinder boundary. 395 * Note this restriction is forced upon NetBSD/sparc 396 * labels too, since we want to keep both labels 397 * synchronised. 398 */ 399 if (npp->p_offset % secpercyl) 400 return (EINVAL); 401 spp->sdkp_cyloffset = npp->p_offset / secpercyl; 402 spp->sdkp_nsectors = npp->p_size; 403 } 404 sl->sl_magic = SUN_DKMAGIC; 405 406 /* Compute the XOR check. */ 407 sp1 = (u_short *)sl; 408 sp2 = (u_short *)(sl + 1); 409 sl->sl_cksum = cksum = 0; 410 while (sp1 < sp2) 411 cksum ^= *sp1++; 412 sl->sl_cksum = cksum; 413 414 return (0); 415 } 416 417 /* 418 * Search the bad sector table looking for the specified sector. 419 * Return index if found. 420 * Return -1 if not found. 421 */ 422 int 423 isbad(struct dkbad *bt, int cyl, int trk, int sec) 424 { 425 int i; 426 long blk, bblk; 427 428 blk = ((long)cyl << 16) + (trk << 8) + sec; 429 for (i = 0; i < 126; i++) { 430 bblk = ((long)bt->bt_bad[i].bt_cyl << 16) + 431 bt->bt_bad[i].bt_trksec; 432 if (blk == bblk) 433 return (i); 434 if (blk < bblk || bblk < 0) 435 break; 436 } 437 return (-1); 438 } 439
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