1 /*- 2 * Copyright (c) 1994 Bruce D. Evans. 3 * All rights reserved. 4 * 5 * Copyright (c) 1990 The Regents of the University of California. 6 * All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * William Jolitz. 10 * 11 * Copyright (c) 1982, 1986, 1988 Regents of the University of California. 12 * All rights reserved. 13 * 14 * Redistribution and use in source and binary forms, with or without 15 * modification, are permitted provided that the following conditions 16 * are met: 17 * 1. Redistributions of source code must retain the above copyright 18 * notice, this list of conditions and the following disclaimer. 19 * 2. Redistributions in binary form must reproduce the above copyright 20 * notice, this list of conditions and the following disclaimer in the 21 * documentation and/or other materials provided with the distribution. 22 * 3. All advertising materials mentioning features or use of this software 23 * must display the following acknowledgement: 24 * This product includes software developed by the University of 25 * California, Berkeley and its contributors. 26 * 4. Neither the name of the University nor the names of its contributors 27 * may be used to endorse or promote products derived from this software 28 * without specific prior written permission. 29 * 30 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 31 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 32 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 33 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 34 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 35 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 36 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 37 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 38 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 39 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 40 * SUCH DAMAGE. 41 * 42 * from: @(#)wd.c 7.2 (Berkeley) 5/9/91 43 * from: wd.c,v 1.55 1994/10/22 01:57:12 phk Exp $ 44 * from: @(#)ufs_disksubr.c 7.16 (Berkeley) 5/4/91 45 * from: ufs_disksubr.c,v 1.8 1994/06/07 01:21:39 phk Exp $ 46 * $FreeBSD: src/sys/kern/subr_diskslice.c,v 1.82.2.6 2001/07/24 09:49:41 dd Exp $ 47 * $DragonFly: src/sys/kern/subr_diskslice.c,v 1.15 2006/04/03 02:02:35 dillon Exp $ 48 */ 49 50 #include <sys/param.h> 51 #include <sys/systm.h> 52 #include <sys/buf.h> 53 #include <sys/conf.h> 54 #include <sys/disklabel.h> 55 #include <sys/diskslice.h> 56 #include <sys/diskmbr.h> 57 #include <sys/fcntl.h> 58 #include <sys/malloc.h> 59 #include <sys/stat.h> 60 #include <sys/syslog.h> 61 #include <sys/vnode.h> 62 #include <sys/device.h> 63 #include <sys/thread2.h> 64 65 #include <vfs/ufs/dinode.h> /* XXX used only for fs.h */ 66 #include <vfs/ufs/fs.h> /* XXX used only to get BBSIZE/SBSIZE */ 67 68 #define TRACE(str) do { if (ds_debug) printf str; } while (0) 69 70 typedef u_char bool_t; 71 72 static volatile bool_t ds_debug; 73 74 static struct disklabel *clone_label (struct disklabel *lp); 75 static void dsiodone (struct bio *bio); 76 static char *fixlabel (char *sname, struct diskslice *sp, 77 struct disklabel *lp, int writeflag); 78 static void free_ds_label (struct diskslices *ssp, int slice); 79 static void partition_info (char *sname, int part, struct partition *pp); 80 static void slice_info (char *sname, struct diskslice *sp); 81 static void set_ds_label (struct diskslices *ssp, int slice, 82 struct disklabel *lp); 83 static void set_ds_wlabel (struct diskslices *ssp, int slice, int wlabel); 84 85 /* 86 * Duplicate a label for the whole disk, and initialize defaults in the 87 * copy for fields that are not already initialized. The caller only 88 * needs to initialize d_secsize and d_secperunit, and zero the fields 89 * that are to be defaulted. 90 */ 91 static struct disklabel * 92 clone_label(struct disklabel *lp) 93 { 94 struct disklabel *lp1; 95 96 lp1 = malloc(sizeof *lp1, M_DEVBUF, M_WAITOK); 97 *lp1 = *lp; 98 lp = NULL; 99 if (lp1->d_typename[0] == '\0') 100 strncpy(lp1->d_typename, "amnesiac", sizeof(lp1->d_typename)); 101 if (lp1->d_packname[0] == '\0') 102 strncpy(lp1->d_packname, "fictitious", sizeof(lp1->d_packname)); 103 if (lp1->d_nsectors == 0) 104 lp1->d_nsectors = 32; 105 if (lp1->d_ntracks == 0) 106 lp1->d_ntracks = 64; 107 lp1->d_secpercyl = lp1->d_nsectors * lp1->d_ntracks; 108 lp1->d_ncylinders = lp1->d_secperunit / lp1->d_secpercyl; 109 if (lp1->d_rpm == 0) 110 lp1->d_rpm = 3600; 111 if (lp1->d_interleave == 0) 112 lp1->d_interleave = 1; 113 if (lp1->d_npartitions < RAW_PART + 1) 114 lp1->d_npartitions = MAXPARTITIONS; 115 if (lp1->d_bbsize == 0) 116 lp1->d_bbsize = BBSIZE; 117 if (lp1->d_sbsize == 0) 118 lp1->d_sbsize = SBSIZE; 119 lp1->d_partitions[RAW_PART].p_size = lp1->d_secperunit; 120 lp1->d_magic = DISKMAGIC; 121 lp1->d_magic2 = DISKMAGIC; 122 lp1->d_checksum = dkcksum(lp1); 123 return (lp1); 124 } 125 126 /* 127 * Determine the size of the transfer, and make sure it is 128 * within the boundaries of the partition. Adjust transfer 129 * if needed, and signal errors or early completion. 130 * 131 * XXX TODO: 132 * o Split buffers that are too big for the device. 133 * o Check for overflow. 134 * o Finish cleaning this up. 135 * 136 * This function returns 1 on success, 0 if transfer equates 137 * to EOF (end of disk) or -1 on failure. The appropriate 138 * 'errno' value is also set in bp->b_error and bp->b_flags 139 * is marked with B_ERROR. 140 */ 141 struct bio * 142 dscheck(dev_t dev, struct bio *bio, struct diskslices *ssp) 143 { 144 struct buf *bp = bio->bio_buf; 145 struct bio *nbio; 146 u_long endsecno; 147 daddr_t labelsect; 148 struct disklabel *lp; 149 char *msg; 150 long nsec; 151 struct partition *pp; 152 daddr_t secno; 153 daddr_t slicerel_secno; 154 struct diskslice *sp; 155 int shift; 156 int mask; 157 158 if (bio->bio_offset < 0) { 159 printf("dscheck(%s): negative bio_offset %lld\n", 160 devtoname(dev), bio->bio_offset); 161 bp->b_error = EINVAL; 162 goto bad; 163 } 164 sp = &ssp->dss_slices[dkslice(dev)]; 165 lp = sp->ds_label; 166 167 if (ssp->dss_secmult == 1) { 168 shift = DEV_BSHIFT; 169 goto doshift; 170 } else if (ssp->dss_secshift != -1) { 171 shift = DEV_BSHIFT + ssp->dss_secshift; 172 doshift: 173 mask = (1 << shift) - 1; 174 if ((int)bp->b_bcount & mask) 175 goto bad_bcount; 176 if ((int)bio->bio_offset & mask) 177 goto bad_blkno; 178 secno = (daddr_t)(bio->bio_offset >> shift); 179 nsec = bp->b_bcount >> shift; 180 } else { 181 if (bp->b_bcount % ssp->dss_secsize) 182 goto bad_bcount; 183 if (bio->bio_offset % ssp->dss_secsize) 184 goto bad_blkno; 185 secno = (daddr_t)(bio->bio_offset / ssp->dss_secsize); 186 nsec = bp->b_bcount / ssp->dss_secsize; 187 } 188 if (lp == NULL) { 189 labelsect = -LABELSECTOR - 1; 190 endsecno = sp->ds_size; 191 slicerel_secno = secno; 192 } else { 193 labelsect = lp->d_partitions[LABEL_PART].p_offset; 194 if (labelsect != 0) 195 Debugger("labelsect != 0 in dscheck()"); 196 pp = &lp->d_partitions[dkpart(dev)]; 197 endsecno = pp->p_size; 198 slicerel_secno = pp->p_offset + secno; 199 } 200 201 /* overwriting disk label ? */ 202 /* XXX should also protect bootstrap in first 8K */ 203 if (slicerel_secno <= LABELSECTOR + labelsect && 204 #if LABELSECTOR != 0 205 slicerel_secno + nsec > LABELSECTOR + labelsect && 206 #endif 207 (bp->b_flags & B_READ) == 0 && sp->ds_wlabel == 0) { 208 bp->b_error = EROFS; 209 goto bad; 210 } 211 212 #if defined(DOSBBSECTOR) && defined(notyet) 213 /* overwriting master boot record? */ 214 if (slicerel_secno <= DOSBBSECTOR && (bp->b_flags & B_READ) == 0 && 215 sp->ds_wlabel == 0) { 216 bp->b_error = EROFS; 217 goto bad; 218 } 219 #endif 220 221 /* beyond partition? */ 222 if (secno + nsec > endsecno) { 223 /* if exactly at end of disk, return an EOF */ 224 if (secno == endsecno) { 225 bp->b_resid = bp->b_bcount; 226 return (0); 227 } 228 /* or truncate if part of it fits */ 229 nsec = endsecno - secno; 230 if (nsec <= 0) { 231 bp->b_error = EINVAL; 232 goto bad; 233 } 234 bp->b_bcount = nsec * ssp->dss_secsize; 235 } 236 237 nbio = push_bio(bio); 238 nbio->bio_offset = (off_t)(sp->ds_offset + slicerel_secno) * ssp->dss_secsize; 239 240 /* 241 * Snoop on label accesses if the slice offset is nonzero. Fudge 242 * offsets in the label to keep the in-core label coherent with 243 * the on-disk one. 244 */ 245 if (slicerel_secno <= LABELSECTOR + labelsect 246 #if LABELSECTOR != 0 247 && slicerel_secno + nsec > LABELSECTOR + labelsect 248 #endif 249 && sp->ds_offset != 0) { 250 nbio->bio_done = dsiodone; 251 nbio->bio_caller_info1.ptr = sp; 252 nbio->bio_caller_info2.offset = (off_t)(LABELSECTOR + labelsect - 253 slicerel_secno) * ssp->dss_secsize; 254 if ((bp->b_flags & B_READ) == 0) { 255 /* 256 * XXX even disklabel(8) writes directly so we need 257 * to adjust writes. Perhaps we should drop support 258 * for DIOCWLABEL (always write protect labels) and 259 * require the use of DIOCWDINFO. 260 * 261 * XXX probably need to copy the data to avoid even 262 * temporarily corrupting the in-core copy. 263 */ 264 /* XXX need name here. */ 265 msg = fixlabel( 266 NULL, sp, 267 (struct disklabel *) 268 (bp->b_data + (int)nbio->bio_caller_info2.offset), 269 TRUE); 270 if (msg != NULL) { 271 printf("dscheck(%s): %s\n", 272 devtoname(dev), msg); 273 bp->b_error = EROFS; 274 pop_bio(nbio); 275 goto bad; 276 } 277 } 278 } 279 return (nbio); 280 281 bad_bcount: 282 printf( 283 "dscheck(%s): b_bcount %d is not on a sector boundary (ssize %d)\n", 284 devtoname(dev), bp->b_bcount, ssp->dss_secsize); 285 bp->b_error = EINVAL; 286 goto bad; 287 288 bad_blkno: 289 printf( 290 "dscheck(%s): bio_offset %lld is not on a sector boundary (ssize %d)\n", 291 devtoname(dev), bio->bio_offset, ssp->dss_secsize); 292 bp->b_error = EINVAL; 293 goto bad; 294 295 bad: 296 bp->b_resid = bp->b_bcount; 297 bp->b_flags |= B_ERROR; 298 return (NULL); 299 } 300 301 void 302 dsclose(dev_t dev, int mode, struct diskslices *ssp) 303 { 304 u_char mask; 305 struct diskslice *sp; 306 307 sp = &ssp->dss_slices[dkslice(dev)]; 308 mask = 1 << dkpart(dev); 309 sp->ds_openmask &= ~mask; 310 } 311 312 void 313 dsgone(struct diskslices **sspp) 314 { 315 int slice; 316 struct diskslice *sp; 317 struct diskslices *ssp; 318 319 for (slice = 0, ssp = *sspp; slice < ssp->dss_nslices; slice++) { 320 sp = &ssp->dss_slices[slice]; 321 free_ds_label(ssp, slice); 322 } 323 free(ssp, M_DEVBUF); 324 *sspp = NULL; 325 } 326 327 /* 328 * For the "write" commands (DIOCSDINFO and DIOCWDINFO), this 329 * is subject to the same restriction as dsopen(). 330 */ 331 int 332 dsioctl(dev_t dev, u_long cmd, caddr_t data, 333 int flags, struct diskslices **sspp) 334 { 335 int error; 336 struct disklabel *lp; 337 int old_wlabel; 338 u_char openmask; 339 int part; 340 int slice; 341 struct diskslice *sp; 342 struct diskslices *ssp; 343 struct partition *pp; 344 345 slice = dkslice(dev); 346 ssp = *sspp; 347 sp = &ssp->dss_slices[slice]; 348 lp = sp->ds_label; 349 switch (cmd) { 350 351 case DIOCGDVIRGIN: 352 lp = (struct disklabel *)data; 353 if (ssp->dss_slices[WHOLE_DISK_SLICE].ds_label) { 354 *lp = *ssp->dss_slices[WHOLE_DISK_SLICE].ds_label; 355 } else { 356 bzero(lp, sizeof(struct disklabel)); 357 } 358 359 lp->d_magic = DISKMAGIC; 360 lp->d_magic2 = DISKMAGIC; 361 pp = &lp->d_partitions[RAW_PART]; 362 pp->p_offset = 0; 363 pp->p_size = sp->ds_size; 364 365 lp->d_npartitions = MAXPARTITIONS; 366 if (lp->d_interleave == 0) 367 lp->d_interleave = 1; 368 if (lp->d_rpm == 0) 369 lp->d_rpm = 3600; 370 if (lp->d_nsectors == 0) 371 lp->d_nsectors = 32; 372 if (lp->d_ntracks == 0) 373 lp->d_ntracks = 64; 374 375 lp->d_bbsize = BBSIZE; 376 lp->d_sbsize = SBSIZE; 377 lp->d_secpercyl = lp->d_nsectors * lp->d_ntracks; 378 lp->d_ncylinders = sp->ds_size / lp->d_secpercyl; 379 lp->d_secperunit = sp->ds_size; 380 lp->d_checksum = 0; 381 lp->d_checksum = dkcksum(lp); 382 return (0); 383 384 case DIOCGDINFO: 385 if (lp == NULL) 386 return (EINVAL); 387 *(struct disklabel *)data = *lp; 388 return (0); 389 390 #ifdef notyet 391 case DIOCGDINFOP: 392 if (lp == NULL) 393 return (EINVAL); 394 *(struct disklabel **)data = lp; 395 return (0); 396 #endif 397 398 case DIOCGPART: 399 if (lp == NULL) 400 return (EINVAL); 401 ((struct partinfo *)data)->disklab = lp; 402 ((struct partinfo *)data)->part 403 = &lp->d_partitions[dkpart(dev)]; 404 return (0); 405 406 case DIOCGSLICEINFO: 407 bcopy(ssp, data, (char *)&ssp->dss_slices[ssp->dss_nslices] - 408 (char *)ssp); 409 return (0); 410 411 case DIOCSDINFO: 412 if (slice == WHOLE_DISK_SLICE) 413 return (ENODEV); 414 if (!(flags & FWRITE)) 415 return (EBADF); 416 lp = malloc(sizeof *lp, M_DEVBUF, M_WAITOK); 417 if (sp->ds_label == NULL) 418 bzero(lp, sizeof *lp); 419 else 420 bcopy(sp->ds_label, lp, sizeof *lp); 421 if (sp->ds_label == NULL) 422 openmask = 0; 423 else { 424 openmask = sp->ds_openmask; 425 if (slice == COMPATIBILITY_SLICE) 426 openmask |= ssp->dss_slices[ 427 ssp->dss_first_bsd_slice].ds_openmask; 428 else if (slice == ssp->dss_first_bsd_slice) 429 openmask |= ssp->dss_slices[ 430 COMPATIBILITY_SLICE].ds_openmask; 431 } 432 error = setdisklabel(lp, (struct disklabel *)data, 433 (u_long)openmask); 434 /* XXX why doesn't setdisklabel() check this? */ 435 if (error == 0 && lp->d_partitions[RAW_PART].p_offset != 0) 436 error = EXDEV; 437 if (error == 0) { 438 if (lp->d_secperunit > sp->ds_size) 439 error = ENOSPC; 440 for (part = 0; part < lp->d_npartitions; part++) 441 if (lp->d_partitions[part].p_size > sp->ds_size) 442 error = ENOSPC; 443 } 444 if (error != 0) { 445 free(lp, M_DEVBUF); 446 return (error); 447 } 448 free_ds_label(ssp, slice); 449 set_ds_label(ssp, slice, lp); 450 return (0); 451 452 case DIOCSYNCSLICEINFO: 453 if (slice != WHOLE_DISK_SLICE || dkpart(dev) != RAW_PART) 454 return (EINVAL); 455 if (!*(int *)data) 456 for (slice = 0; slice < ssp->dss_nslices; slice++) { 457 openmask = ssp->dss_slices[slice].ds_openmask; 458 if (openmask 459 && (slice != WHOLE_DISK_SLICE 460 || openmask & ~(1 << RAW_PART))) 461 return (EBUSY); 462 } 463 464 /* 465 * Temporarily forget the current slices struct and read 466 * the current one. 467 * XXX should wait for current accesses on this disk to 468 * complete, then lock out future accesses and opens. 469 */ 470 *sspp = NULL; 471 lp = malloc(sizeof *lp, M_DEVBUF, M_WAITOK); 472 *lp = *ssp->dss_slices[WHOLE_DISK_SLICE].ds_label; 473 error = dsopen(dev, S_IFCHR, ssp->dss_oflags, sspp, lp); 474 if (error != 0) { 475 free(lp, M_DEVBUF); 476 *sspp = ssp; 477 return (error); 478 } 479 480 /* 481 * Reopen everything. This is a no-op except in the "force" 482 * case and when the raw bdev and cdev are both open. Abort 483 * if anything fails. 484 */ 485 for (slice = 0; slice < ssp->dss_nslices; slice++) { 486 for (openmask = ssp->dss_slices[slice].ds_openmask, 487 part = 0; openmask; openmask >>= 1, part++) { 488 if (!(openmask & 1)) 489 continue; 490 error = dsopen(dkmodslice(dkmodpart(dev, part), 491 slice), 492 S_IFCHR, ssp->dss_oflags, sspp, 493 lp); 494 if (error != 0) { 495 free(lp, M_DEVBUF); 496 *sspp = ssp; 497 return (EBUSY); 498 } 499 } 500 } 501 502 free(lp, M_DEVBUF); 503 dsgone(&ssp); 504 return (0); 505 506 case DIOCWDINFO: 507 error = dsioctl(dev, DIOCSDINFO, data, flags, &ssp); 508 if (error != 0) 509 return (error); 510 /* 511 * XXX this used to hack on dk_openpart to fake opening 512 * partition 0 in case that is used instead of dkpart(dev). 513 */ 514 old_wlabel = sp->ds_wlabel; 515 set_ds_wlabel(ssp, slice, TRUE); 516 error = writedisklabel(dev, sp->ds_label); 517 /* XXX should invalidate in-core label if write failed. */ 518 set_ds_wlabel(ssp, slice, old_wlabel); 519 return (error); 520 521 case DIOCWLABEL: 522 if (slice == WHOLE_DISK_SLICE) 523 return (ENODEV); 524 if (!(flags & FWRITE)) 525 return (EBADF); 526 set_ds_wlabel(ssp, slice, *(int *)data != 0); 527 return (0); 528 529 default: 530 return (ENOIOCTL); 531 } 532 } 533 534 static void 535 dsiodone(struct bio *bio) 536 { 537 struct buf *bp = bio->bio_buf; 538 char *msg; 539 540 bp->b_flags = bp->b_flags & ~B_DONE; 541 if (!(bp->b_flags & B_READ) 542 || (!(bp->b_flags & B_ERROR) && bp->b_error == 0)) { 543 msg = fixlabel(NULL, bio->bio_caller_info1.ptr, 544 (struct disklabel *) 545 (bp->b_data + (int)bio->bio_caller_info2.offset), 546 FALSE); 547 if (msg != NULL) 548 printf("%s\n", msg); 549 } 550 biodone(bio->bio_prev); 551 } 552 553 int 554 dsisopen(struct diskslices *ssp) 555 { 556 int slice; 557 558 if (ssp == NULL) 559 return (0); 560 for (slice = 0; slice < ssp->dss_nslices; slice++) { 561 if (ssp->dss_slices[slice].ds_openmask) 562 return (1); 563 } 564 return (0); 565 } 566 567 /* 568 * Allocate a slices "struct" and initialize it to contain only an empty 569 * compatibility slice (pointing to itself), a whole disk slice (covering 570 * the disk as described by the label), and (nslices - BASE_SLICES) empty 571 * slices beginning at BASE_SLICE. 572 */ 573 struct diskslices * 574 dsmakeslicestruct(int nslices, struct disklabel *lp) 575 { 576 struct diskslice *sp; 577 struct diskslices *ssp; 578 579 ssp = malloc(offsetof(struct diskslices, dss_slices) + 580 nslices * sizeof *sp, M_DEVBUF, M_WAITOK); 581 ssp->dss_first_bsd_slice = COMPATIBILITY_SLICE; 582 ssp->dss_nslices = nslices; 583 ssp->dss_oflags = 0; 584 ssp->dss_secmult = lp->d_secsize / DEV_BSIZE; 585 if (ssp->dss_secmult & (ssp->dss_secmult - 1)) 586 ssp->dss_secshift = -1; 587 else 588 ssp->dss_secshift = ffs(ssp->dss_secmult) - 1; 589 ssp->dss_secsize = lp->d_secsize; 590 sp = &ssp->dss_slices[0]; 591 bzero(sp, nslices * sizeof *sp); 592 sp[WHOLE_DISK_SLICE].ds_size = lp->d_secperunit; 593 return (ssp); 594 } 595 596 char * 597 dsname(dev_t dev, int unit, int slice, int part, char *partname) 598 { 599 static char name[32]; 600 const char *dname; 601 602 dname = dev_dname(dev); 603 if (strlen(dname) > 16) 604 dname = "nametoolong"; 605 snprintf(name, sizeof(name), "%s%d", dname, unit); 606 partname[0] = '\0'; 607 if (slice != WHOLE_DISK_SLICE || part != RAW_PART) { 608 partname[0] = 'a' + part; 609 partname[1] = '\0'; 610 if (slice != COMPATIBILITY_SLICE) { 611 snprintf(name + strlen(name), 612 sizeof(name) - strlen(name), "s%d", slice - 1); 613 } 614 } 615 return (name); 616 } 617 618 /* 619 * This should only be called when the unit is inactive and the strategy 620 * routine should not allow it to become active unless we call it. Our 621 * strategy routine must be special to allow activity. 622 */ 623 int 624 dsopen(dev_t dev, int mode, u_int flags, 625 struct diskslices **sspp, struct disklabel *lp) 626 { 627 dev_t dev1; 628 int error; 629 struct disklabel *lp1; 630 char *msg; 631 u_char mask; 632 bool_t need_init; 633 int part; 634 char partname[2]; 635 int slice; 636 char *sname; 637 struct diskslice *sp; 638 struct diskslices *ssp; 639 int unit; 640 641 dev->si_bsize_phys = lp->d_secsize; 642 643 unit = dkunit(dev); 644 if (lp->d_secsize % DEV_BSIZE) { 645 printf("%s: invalid sector size %lu\n", devtoname(dev), 646 (u_long)lp->d_secsize); 647 return (EINVAL); 648 } 649 650 /* 651 * XXX reinitialize the slice table unless there is an open device 652 * on the unit. This should only be done if the media has changed. 653 */ 654 ssp = *sspp; 655 need_init = !dsisopen(ssp); 656 if (ssp != NULL && need_init) 657 dsgone(sspp); 658 if (need_init) { 659 /* 660 * Allocate a minimal slices "struct". This will become 661 * the final slices "struct" if we don't want real slices 662 * or if we can't find any real slices. 663 */ 664 *sspp = dsmakeslicestruct(BASE_SLICE, lp); 665 666 if (!(flags & DSO_ONESLICE)) { 667 TRACE(("dsinit\n")); 668 error = dsinit(dev, lp, sspp); 669 if (error != 0) { 670 dsgone(sspp); 671 return (error); 672 } 673 } 674 ssp = *sspp; 675 ssp->dss_oflags = flags; 676 677 /* 678 * If there are no real slices, then make the compatiblity 679 * slice cover the whole disk. 680 */ 681 if (ssp->dss_nslices == BASE_SLICE) 682 ssp->dss_slices[COMPATIBILITY_SLICE].ds_size 683 = lp->d_secperunit; 684 685 /* Point the compatibility slice at the BSD slice, if any. */ 686 for (slice = BASE_SLICE; slice < ssp->dss_nslices; slice++) { 687 sp = &ssp->dss_slices[slice]; 688 if (sp->ds_type == DOSPTYP_386BSD /* XXX */) { 689 ssp->dss_first_bsd_slice = slice; 690 ssp->dss_slices[COMPATIBILITY_SLICE].ds_offset 691 = sp->ds_offset; 692 ssp->dss_slices[COMPATIBILITY_SLICE].ds_size 693 = sp->ds_size; 694 ssp->dss_slices[COMPATIBILITY_SLICE].ds_type 695 = sp->ds_type; 696 break; 697 } 698 } 699 700 ssp->dss_slices[WHOLE_DISK_SLICE].ds_label = clone_label(lp); 701 ssp->dss_slices[WHOLE_DISK_SLICE].ds_wlabel = TRUE; 702 } 703 704 /* 705 * Initialize secondary info for all slices. It is needed for more 706 * than the current slice in the DEVFS case. XXX DEVFS is no more. 707 */ 708 for (slice = 0; slice < ssp->dss_nslices; slice++) { 709 sp = &ssp->dss_slices[slice]; 710 if (sp->ds_label != NULL) 711 continue; 712 dev1 = dkmodslice(dkmodpart(dev, RAW_PART), slice); 713 sname = dsname(dev, unit, slice, RAW_PART, partname); 714 /* 715 * XXX this should probably only be done for the need_init 716 * case, but there may be a problem with DIOCSYNCSLICEINFO. 717 */ 718 set_ds_wlabel(ssp, slice, TRUE); /* XXX invert */ 719 lp1 = clone_label(lp); 720 TRACE(("readdisklabel\n")); 721 if (flags & DSO_NOLABELS) 722 msg = NULL; 723 else { 724 msg = readdisklabel(dev1, lp1); 725 726 /* 727 * readdisklabel() returns NULL for success, and an 728 * error string for failure. 729 * 730 * If there isn't a label on the disk, and if the 731 * DSO_COMPATLABEL is set, we want to use the 732 * faked-up label provided by the caller. 733 * 734 * So we set msg to NULL to indicate that there is 735 * no failure (since we have a faked-up label), 736 * free lp1, and then clone it again from lp. 737 * (In case readdisklabel() modified lp1.) 738 */ 739 if (msg != NULL && (flags & DSO_COMPATLABEL)) { 740 msg = NULL; 741 free(lp1, M_DEVBUF); 742 lp1 = clone_label(lp); 743 } 744 } 745 if (msg == NULL) 746 msg = fixlabel(sname, sp, lp1, FALSE); 747 if (msg == NULL && lp1->d_secsize != ssp->dss_secsize) 748 msg = "inconsistent sector size"; 749 if (msg != NULL) { 750 if (sp->ds_type == DOSPTYP_386BSD /* XXX */) 751 log(LOG_WARNING, "%s: cannot find label (%s)\n", 752 sname, msg); 753 free(lp1, M_DEVBUF); 754 continue; 755 } 756 if (lp1->d_flags & D_BADSECT) { 757 log(LOG_ERR, "%s: bad sector table not supported\n", 758 sname); 759 free(lp1, M_DEVBUF); 760 continue; 761 } 762 set_ds_label(ssp, slice, lp1); 763 set_ds_wlabel(ssp, slice, FALSE); 764 } 765 766 slice = dkslice(dev); 767 if (slice >= ssp->dss_nslices) 768 return (ENXIO); 769 sp = &ssp->dss_slices[slice]; 770 part = dkpart(dev); 771 if (part != RAW_PART 772 && (sp->ds_label == NULL || part >= sp->ds_label->d_npartitions)) 773 return (EINVAL); /* XXX needs translation */ 774 mask = 1 << part; 775 sp->ds_openmask |= mask; 776 return (0); 777 } 778 779 int 780 dssize(dev_t dev, struct diskslices **sspp) 781 { 782 struct disklabel *lp; 783 int part; 784 int slice; 785 struct diskslices *ssp; 786 787 slice = dkslice(dev); 788 part = dkpart(dev); 789 ssp = *sspp; 790 if (ssp == NULL || slice >= ssp->dss_nslices 791 || !(ssp->dss_slices[slice].ds_openmask & (1 << part))) { 792 if (dev_dopen(dev, FREAD, S_IFCHR, NULL) != 0) 793 return (-1); 794 dev_dclose(dev, FREAD, S_IFCHR, NULL); 795 ssp = *sspp; 796 } 797 lp = ssp->dss_slices[slice].ds_label; 798 if (lp == NULL) 799 return (-1); 800 return ((int)lp->d_partitions[part].p_size); 801 } 802 803 static void 804 free_ds_label(struct diskslices *ssp, int slice) 805 { 806 struct disklabel *lp; 807 struct diskslice *sp; 808 809 sp = &ssp->dss_slices[slice]; 810 lp = sp->ds_label; 811 if (lp == NULL) 812 return; 813 free(lp, M_DEVBUF); 814 set_ds_label(ssp, slice, (struct disklabel *)NULL); 815 } 816 817 static char * 818 fixlabel(char *sname, struct diskslice *sp, struct disklabel *lp, int writeflag) 819 { 820 u_long end; 821 u_long offset; 822 int part; 823 struct partition *pp; 824 u_long start; 825 bool_t warned; 826 827 /* These errors "can't happen" so don't bother reporting details. */ 828 if (lp->d_magic != DISKMAGIC || lp->d_magic2 != DISKMAGIC) 829 return ("fixlabel: invalid magic"); 830 if (dkcksum(lp) != 0) 831 return ("fixlabel: invalid checksum"); 832 833 pp = &lp->d_partitions[RAW_PART]; 834 if (writeflag) { 835 start = 0; 836 offset = sp->ds_offset; 837 } else { 838 start = sp->ds_offset; 839 offset = -sp->ds_offset; 840 } 841 if (pp->p_offset != start) { 842 if (sname != NULL) { 843 printf( 844 "%s: rejecting BSD label: raw partition offset != slice offset\n", 845 sname); 846 slice_info(sname, sp); 847 partition_info(sname, RAW_PART, pp); 848 } 849 return ("fixlabel: raw partition offset != slice offset"); 850 } 851 if (pp->p_size != sp->ds_size) { 852 if (sname != NULL) { 853 printf("%s: raw partition size != slice size\n", sname); 854 slice_info(sname, sp); 855 partition_info(sname, RAW_PART, pp); 856 } 857 if (pp->p_size > sp->ds_size) { 858 if (sname == NULL) 859 return ("fixlabel: raw partition size > slice size"); 860 printf("%s: truncating raw partition\n", sname); 861 pp->p_size = sp->ds_size; 862 } 863 } 864 end = start + sp->ds_size; 865 if (start > end) 866 return ("fixlabel: slice wraps"); 867 if (lp->d_secpercyl <= 0) 868 return ("fixlabel: d_secpercyl <= 0"); 869 pp -= RAW_PART; 870 warned = FALSE; 871 for (part = 0; part < lp->d_npartitions; part++, pp++) { 872 if (pp->p_offset != 0 || pp->p_size != 0) { 873 if (pp->p_offset < start 874 || pp->p_offset + pp->p_size > end 875 || pp->p_offset + pp->p_size < pp->p_offset) { 876 if (sname != NULL) { 877 printf( 878 "%s: rejecting partition in BSD label: it isn't entirely within the slice\n", 879 sname); 880 if (!warned) { 881 slice_info(sname, sp); 882 warned = TRUE; 883 } 884 partition_info(sname, part, pp); 885 } 886 /* XXX else silently discard junk. */ 887 bzero(pp, sizeof *pp); 888 } else 889 pp->p_offset += offset; 890 } 891 } 892 lp->d_ncylinders = sp->ds_size / lp->d_secpercyl; 893 lp->d_secperunit = sp->ds_size; 894 lp->d_checksum = 0; 895 lp->d_checksum = dkcksum(lp); 896 return (NULL); 897 } 898 899 static void 900 partition_info(char *sname, int part, struct partition *pp) 901 { 902 printf("%s%c: start %lu, end %lu, size %lu\n", sname, 'a' + part, 903 (u_long)pp->p_offset, (u_long)(pp->p_offset + pp->p_size - 1), 904 (u_long)pp->p_size); 905 } 906 907 static void 908 slice_info(char *sname, struct diskslice *sp) 909 { 910 printf("%s: start %lu, end %lu, size %lu\n", sname, 911 sp->ds_offset, sp->ds_offset + sp->ds_size - 1, sp->ds_size); 912 } 913 914 static void 915 set_ds_label(struct diskslices *ssp, int slice, struct disklabel *lp) 916 { 917 ssp->dss_slices[slice].ds_label = lp; 918 if (slice == COMPATIBILITY_SLICE) 919 ssp->dss_slices[ssp->dss_first_bsd_slice].ds_label = lp; 920 else if (slice == ssp->dss_first_bsd_slice) 921 ssp->dss_slices[COMPATIBILITY_SLICE].ds_label = lp; 922 } 923 924 static void 925 set_ds_wlabel(struct diskslices *ssp, int slice, int wlabel) 926 { 927 ssp->dss_slices[slice].ds_wlabel = wlabel; 928 if (slice == COMPATIBILITY_SLICE) 929 ssp->dss_slices[ssp->dss_first_bsd_slice].ds_wlabel = wlabel; 930 else if (slice == ssp->dss_first_bsd_slice) 931 ssp->dss_slices[COMPATIBILITY_SLICE].ds_wlabel = wlabel; 932 } 933