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 1.11 2005/08/03 16:36:33 hmp 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/fs.h> 66 67 #define TRACE(str) do { if (ds_debug) printf str; } while (0) 68 69 typedef u_char bool_t; 70 71 static volatile bool_t ds_debug; 72 73 static struct disklabel *clone_label (struct disklabel *lp); 74 static void dsiodone (struct buf *bp); 75 static char *fixlabel (char *sname, struct diskslice *sp, 76 struct disklabel *lp, int writeflag); 77 static void free_ds_label (struct diskslices *ssp, int slice); 78 static void partition_info (char *sname, int part, struct partition *pp); 79 static void slice_info (char *sname, struct diskslice *sp); 80 static void set_ds_label (struct diskslices *ssp, int slice, 81 struct disklabel *lp); 82 static void set_ds_wlabel (struct diskslices *ssp, int slice, int wlabel); 83 84 /* 85 * Duplicate a label for the whole disk, and initialize defaults in the 86 * copy for fields that are not already initialized. The caller only 87 * needs to initialize d_secsize and d_secperunit, and zero the fields 88 * that are to be defaulted. 89 */ 90 static struct disklabel * 91 clone_label(struct disklabel *lp) 92 { 93 struct disklabel *lp1; 94 95 lp1 = malloc(sizeof *lp1, M_DEVBUF, M_WAITOK); 96 *lp1 = *lp; 97 lp = NULL; 98 if (lp1->d_typename[0] == '\0') 99 strncpy(lp1->d_typename, "amnesiac", sizeof(lp1->d_typename)); 100 if (lp1->d_packname[0] == '\0') 101 strncpy(lp1->d_packname, "fictitious", sizeof(lp1->d_packname)); 102 if (lp1->d_nsectors == 0) 103 lp1->d_nsectors = 32; 104 if (lp1->d_ntracks == 0) 105 lp1->d_ntracks = 64; 106 lp1->d_secpercyl = lp1->d_nsectors * lp1->d_ntracks; 107 lp1->d_ncylinders = lp1->d_secperunit / lp1->d_secpercyl; 108 if (lp1->d_rpm == 0) 109 lp1->d_rpm = 3600; 110 if (lp1->d_interleave == 0) 111 lp1->d_interleave = 1; 112 if (lp1->d_npartitions < RAW_PART + 1) 113 lp1->d_npartitions = MAXPARTITIONS; 114 if (lp1->d_bbsize == 0) 115 lp1->d_bbsize = BBSIZE; 116 if (lp1->d_sbsize == 0) 117 lp1->d_sbsize = SBSIZE; 118 lp1->d_partitions[RAW_PART].p_size = lp1->d_secperunit; 119 lp1->d_magic = DISKMAGIC; 120 lp1->d_magic2 = DISKMAGIC; 121 lp1->d_checksum = dkcksum(lp1); 122 return (lp1); 123 } 124 125 /* 126 * Determine the size of the transfer, and make sure it is 127 * within the boundaries of the partition. Adjust transfer 128 * if needed, and signal errors or early completion. 129 * 130 * XXX TODO: 131 * o Split buffers that are too big for the device. 132 * o Check for overflow. 133 * o Finish cleaning this up. 134 */ 135 int 136 dscheck(struct buf *bp, struct diskslices *ssp) 137 { 138 daddr_t blkno; 139 u_long endsecno; 140 daddr_t labelsect; 141 struct disklabel *lp; 142 char *msg; 143 long nsec; 144 struct partition *pp; 145 daddr_t secno; 146 daddr_t slicerel_secno; 147 struct diskslice *sp; 148 149 blkno = bp->b_blkno; 150 if (blkno < 0) { 151 printf("dscheck(%s): negative b_blkno %ld\n", 152 devtoname(bp->b_dev), (long)blkno); 153 bp->b_error = EINVAL; 154 goto bad; 155 } 156 sp = &ssp->dss_slices[dkslice(bp->b_dev)]; 157 lp = sp->ds_label; 158 if (ssp->dss_secmult == 1) { 159 if (bp->b_bcount % (u_long)DEV_BSIZE) 160 goto bad_bcount; 161 secno = blkno; 162 nsec = bp->b_bcount >> DEV_BSHIFT; 163 } else if (ssp->dss_secshift != -1) { 164 if (bp->b_bcount & (ssp->dss_secsize - 1)) 165 goto bad_bcount; 166 if (blkno & (ssp->dss_secmult - 1)) 167 goto bad_blkno; 168 secno = blkno >> ssp->dss_secshift; 169 nsec = bp->b_bcount >> (DEV_BSHIFT + ssp->dss_secshift); 170 } else { 171 if (bp->b_bcount % ssp->dss_secsize) 172 goto bad_bcount; 173 if (blkno % ssp->dss_secmult) 174 goto bad_blkno; 175 secno = blkno / ssp->dss_secmult; 176 nsec = bp->b_bcount / ssp->dss_secsize; 177 } 178 if (lp == NULL) { 179 labelsect = -LABELSECTOR - 1; 180 endsecno = sp->ds_size; 181 slicerel_secno = secno; 182 } else { 183 labelsect = lp->d_partitions[LABEL_PART].p_offset; 184 if (labelsect != 0) 185 Debugger("labelsect != 0 in dscheck()"); 186 pp = &lp->d_partitions[dkpart(bp->b_dev)]; 187 endsecno = pp->p_size; 188 slicerel_secno = pp->p_offset + secno; 189 } 190 191 /* overwriting disk label ? */ 192 /* XXX should also protect bootstrap in first 8K */ 193 if (slicerel_secno <= LABELSECTOR + labelsect && 194 #if LABELSECTOR != 0 195 slicerel_secno + nsec > LABELSECTOR + labelsect && 196 #endif 197 (bp->b_flags & B_READ) == 0 && sp->ds_wlabel == 0) { 198 bp->b_error = EROFS; 199 goto bad; 200 } 201 202 #if defined(DOSBBSECTOR) && defined(notyet) 203 /* overwriting master boot record? */ 204 if (slicerel_secno <= DOSBBSECTOR && (bp->b_flags & B_READ) == 0 && 205 sp->ds_wlabel == 0) { 206 bp->b_error = EROFS; 207 goto bad; 208 } 209 #endif 210 211 /* beyond partition? */ 212 if (secno + nsec > endsecno) { 213 /* if exactly at end of disk, return an EOF */ 214 if (secno == endsecno) { 215 bp->b_resid = bp->b_bcount; 216 return (0); 217 } 218 /* or truncate if part of it fits */ 219 nsec = endsecno - secno; 220 if (nsec <= 0) { 221 bp->b_error = EINVAL; 222 goto bad; 223 } 224 bp->b_bcount = nsec * ssp->dss_secsize; 225 } 226 227 bp->b_pblkno = sp->ds_offset + slicerel_secno; 228 229 /* 230 * Snoop on label accesses if the slice offset is nonzero. Fudge 231 * offsets in the label to keep the in-core label coherent with 232 * the on-disk one. 233 */ 234 if (slicerel_secno <= LABELSECTOR + labelsect 235 #if LABELSECTOR != 0 236 && slicerel_secno + nsec > LABELSECTOR + labelsect 237 #endif 238 && sp->ds_offset != 0) { 239 struct iodone_chain *ic; 240 241 ic = malloc(sizeof *ic , M_DEVBUF, M_WAITOK); 242 ic->ic_prev_flags = bp->b_flags; 243 ic->ic_prev_iodone = bp->b_iodone; 244 ic->ic_prev_iodone_chain = bp->b_iodone_chain; 245 ic->ic_args[0].ia_long = (LABELSECTOR + labelsect - 246 slicerel_secno) * ssp->dss_secsize; 247 ic->ic_args[1].ia_ptr = sp; 248 bp->b_iodone = dsiodone; 249 bp->b_iodone_chain = ic; 250 if (!(bp->b_flags & B_READ)) { 251 /* 252 * XXX even disklabel(8) writes directly so we need 253 * to adjust writes. Perhaps we should drop support 254 * for DIOCWLABEL (always write protect labels) and 255 * require the use of DIOCWDINFO. 256 * 257 * XXX probably need to copy the data to avoid even 258 * temporarily corrupting the in-core copy. 259 */ 260 if (bp->b_vp != NULL) { 261 crit_enter(); 262 bp->b_vp->v_numoutput++; 263 crit_exit(); 264 } 265 /* XXX need name here. */ 266 msg = fixlabel((char *)NULL, sp, 267 (struct disklabel *) 268 (bp->b_data + ic->ic_args[0].ia_long), 269 TRUE); 270 if (msg != NULL) { 271 printf("dscheck(%s): %s\n", 272 devtoname(bp->b_dev), msg); 273 bp->b_error = EROFS; 274 goto bad; 275 } 276 } 277 } 278 return (1); 279 280 bad_bcount: 281 printf( 282 "dscheck(%s): b_bcount %ld is not on a sector boundary (ssize %d)\n", 283 devtoname(bp->b_dev), bp->b_bcount, ssp->dss_secsize); 284 bp->b_error = EINVAL; 285 goto bad; 286 287 bad_blkno: 288 printf( 289 "dscheck(%s): b_blkno %ld is not on a sector boundary (ssize %d)\n", 290 devtoname(bp->b_dev), (long)blkno, ssp->dss_secsize); 291 bp->b_error = EINVAL; 292 goto bad; 293 294 bad: 295 bp->b_resid = bp->b_bcount; 296 bp->b_flags |= B_ERROR; 297 return (-1); 298 } 299 300 void 301 dsclose(dev_t dev, int mode, struct diskslices *ssp) 302 { 303 u_char mask; 304 struct diskslice *sp; 305 306 sp = &ssp->dss_slices[dkslice(dev)]; 307 mask = 1 << dkpart(dev); 308 sp->ds_openmask &= ~mask; 309 } 310 311 void 312 dsgone(struct diskslices **sspp) 313 { 314 int slice; 315 struct diskslice *sp; 316 struct diskslices *ssp; 317 318 for (slice = 0, ssp = *sspp; slice < ssp->dss_nslices; slice++) { 319 sp = &ssp->dss_slices[slice]; 320 free_ds_label(ssp, slice); 321 } 322 free(ssp, M_DEVBUF); 323 *sspp = NULL; 324 } 325 326 /* 327 * For the "write" commands (DIOCSDINFO and DIOCWDINFO), this 328 * is subject to the same restriction as dsopen(). 329 */ 330 int 331 dsioctl(dev_t dev, u_long cmd, caddr_t data, 332 int flags, struct diskslices **sspp) 333 { 334 int error; 335 struct disklabel *lp; 336 int old_wlabel; 337 u_char openmask; 338 int part; 339 int slice; 340 struct diskslice *sp; 341 struct diskslices *ssp; 342 struct partition *pp; 343 344 slice = dkslice(dev); 345 ssp = *sspp; 346 sp = &ssp->dss_slices[slice]; 347 lp = sp->ds_label; 348 switch (cmd) { 349 350 case DIOCGDVIRGIN: 351 lp = (struct disklabel *)data; 352 if (ssp->dss_slices[WHOLE_DISK_SLICE].ds_label) { 353 *lp = *ssp->dss_slices[WHOLE_DISK_SLICE].ds_label; 354 } else { 355 bzero(lp, sizeof(struct disklabel)); 356 } 357 358 lp->d_magic = DISKMAGIC; 359 lp->d_magic2 = DISKMAGIC; 360 pp = &lp->d_partitions[RAW_PART]; 361 pp->p_offset = 0; 362 pp->p_size = sp->ds_size; 363 364 lp->d_npartitions = MAXPARTITIONS; 365 if (lp->d_interleave == 0) 366 lp->d_interleave = 1; 367 if (lp->d_rpm == 0) 368 lp->d_rpm = 3600; 369 if (lp->d_nsectors == 0) 370 lp->d_nsectors = 32; 371 if (lp->d_ntracks == 0) 372 lp->d_ntracks = 64; 373 374 lp->d_bbsize = BBSIZE; 375 lp->d_sbsize = SBSIZE; 376 lp->d_secpercyl = lp->d_nsectors * lp->d_ntracks; 377 lp->d_ncylinders = sp->ds_size / lp->d_secpercyl; 378 lp->d_secperunit = sp->ds_size; 379 lp->d_checksum = 0; 380 lp->d_checksum = dkcksum(lp); 381 return (0); 382 383 case DIOCGDINFO: 384 if (lp == NULL) 385 return (EINVAL); 386 *(struct disklabel *)data = *lp; 387 return (0); 388 389 #ifdef notyet 390 case DIOCGDINFOP: 391 if (lp == NULL) 392 return (EINVAL); 393 *(struct disklabel **)data = lp; 394 return (0); 395 #endif 396 397 case DIOCGPART: 398 if (lp == NULL) 399 return (EINVAL); 400 ((struct partinfo *)data)->disklab = lp; 401 ((struct partinfo *)data)->part 402 = &lp->d_partitions[dkpart(dev)]; 403 return (0); 404 405 case DIOCGSLICEINFO: 406 bcopy(ssp, data, (char *)&ssp->dss_slices[ssp->dss_nslices] - 407 (char *)ssp); 408 return (0); 409 410 case DIOCSDINFO: 411 if (slice == WHOLE_DISK_SLICE) 412 return (ENODEV); 413 if (!(flags & FWRITE)) 414 return (EBADF); 415 lp = malloc(sizeof *lp, M_DEVBUF, M_WAITOK); 416 if (sp->ds_label == NULL) 417 bzero(lp, sizeof *lp); 418 else 419 bcopy(sp->ds_label, lp, sizeof *lp); 420 if (sp->ds_label == NULL) 421 openmask = 0; 422 else { 423 openmask = sp->ds_openmask; 424 if (slice == COMPATIBILITY_SLICE) 425 openmask |= ssp->dss_slices[ 426 ssp->dss_first_bsd_slice].ds_openmask; 427 else if (slice == ssp->dss_first_bsd_slice) 428 openmask |= ssp->dss_slices[ 429 COMPATIBILITY_SLICE].ds_openmask; 430 } 431 error = setdisklabel(lp, (struct disklabel *)data, 432 (u_long)openmask); 433 /* XXX why doesn't setdisklabel() check this? */ 434 if (error == 0 && lp->d_partitions[RAW_PART].p_offset != 0) 435 error = EXDEV; 436 if (error == 0) { 437 if (lp->d_secperunit > sp->ds_size) 438 error = ENOSPC; 439 for (part = 0; part < lp->d_npartitions; part++) 440 if (lp->d_partitions[part].p_size > sp->ds_size) 441 error = ENOSPC; 442 } 443 if (error != 0) { 444 free(lp, M_DEVBUF); 445 return (error); 446 } 447 free_ds_label(ssp, slice); 448 set_ds_label(ssp, slice, lp); 449 return (0); 450 451 case DIOCSYNCSLICEINFO: 452 if (slice != WHOLE_DISK_SLICE || dkpart(dev) != RAW_PART) 453 return (EINVAL); 454 if (!*(int *)data) 455 for (slice = 0; slice < ssp->dss_nslices; slice++) { 456 openmask = ssp->dss_slices[slice].ds_openmask; 457 if (openmask 458 && (slice != WHOLE_DISK_SLICE 459 || openmask & ~(1 << RAW_PART))) 460 return (EBUSY); 461 } 462 463 /* 464 * Temporarily forget the current slices struct and read 465 * the current one. 466 * XXX should wait for current accesses on this disk to 467 * complete, then lock out future accesses and opens. 468 */ 469 *sspp = NULL; 470 lp = malloc(sizeof *lp, M_DEVBUF, M_WAITOK); 471 *lp = *ssp->dss_slices[WHOLE_DISK_SLICE].ds_label; 472 error = dsopen(dev, S_IFCHR, ssp->dss_oflags, sspp, lp); 473 if (error != 0) { 474 free(lp, M_DEVBUF); 475 *sspp = ssp; 476 return (error); 477 } 478 479 /* 480 * Reopen everything. This is a no-op except in the "force" 481 * case and when the raw bdev and cdev are both open. Abort 482 * if anything fails. 483 */ 484 for (slice = 0; slice < ssp->dss_nslices; slice++) { 485 for (openmask = ssp->dss_slices[slice].ds_openmask, 486 part = 0; openmask; openmask >>= 1, part++) { 487 if (!(openmask & 1)) 488 continue; 489 error = dsopen(dkmodslice(dkmodpart(dev, part), 490 slice), 491 S_IFCHR, ssp->dss_oflags, sspp, 492 lp); 493 if (error != 0) { 494 free(lp, M_DEVBUF); 495 *sspp = ssp; 496 return (EBUSY); 497 } 498 } 499 } 500 501 free(lp, M_DEVBUF); 502 dsgone(&ssp); 503 return (0); 504 505 case DIOCWDINFO: 506 error = dsioctl(dev, DIOCSDINFO, data, flags, &ssp); 507 if (error != 0) 508 return (error); 509 /* 510 * XXX this used to hack on dk_openpart to fake opening 511 * partition 0 in case that is used instead of dkpart(dev). 512 */ 513 old_wlabel = sp->ds_wlabel; 514 set_ds_wlabel(ssp, slice, TRUE); 515 error = writedisklabel(dev, sp->ds_label); 516 /* XXX should invalidate in-core label if write failed. */ 517 set_ds_wlabel(ssp, slice, old_wlabel); 518 return (error); 519 520 case DIOCWLABEL: 521 if (slice == WHOLE_DISK_SLICE) 522 return (ENODEV); 523 if (!(flags & FWRITE)) 524 return (EBADF); 525 set_ds_wlabel(ssp, slice, *(int *)data != 0); 526 return (0); 527 528 default: 529 return (ENOIOCTL); 530 } 531 } 532 533 static void 534 dsiodone(struct buf *bp) 535 { 536 struct iodone_chain *ic; 537 char *msg; 538 539 ic = bp->b_iodone_chain; 540 bp->b_flags = bp->b_flags & ~B_DONE; 541 bp->b_iodone = ic->ic_prev_iodone; 542 bp->b_iodone_chain = ic->ic_prev_iodone_chain; 543 if (!(bp->b_flags & B_READ) 544 || (!(bp->b_flags & B_ERROR) && bp->b_error == 0)) { 545 msg = fixlabel((char *)NULL, ic->ic_args[1].ia_ptr, 546 (struct disklabel *) 547 (bp->b_data + ic->ic_args[0].ia_long), 548 FALSE); 549 if (msg != NULL) 550 printf("%s\n", msg); 551 } 552 free(ic, M_DEVBUF); 553 biodone(bp); 554 } 555 556 int 557 dsisopen(struct diskslices *ssp) 558 { 559 int slice; 560 561 if (ssp == NULL) 562 return (0); 563 for (slice = 0; slice < ssp->dss_nslices; slice++) { 564 if (ssp->dss_slices[slice].ds_openmask) 565 return (1); 566 } 567 return (0); 568 } 569 570 /* 571 * Allocate a slices "struct" and initialize it to contain only an empty 572 * compatibility slice (pointing to itself), a whole disk slice (covering 573 * the disk as described by the label), and (nslices - BASE_SLICES) empty 574 * slices beginning at BASE_SLICE. 575 */ 576 struct diskslices * 577 dsmakeslicestruct(int nslices, struct disklabel *lp) 578 { 579 struct diskslice *sp; 580 struct diskslices *ssp; 581 582 ssp = malloc(offsetof(struct diskslices, dss_slices) + 583 nslices * sizeof *sp, M_DEVBUF, M_WAITOK); 584 ssp->dss_first_bsd_slice = COMPATIBILITY_SLICE; 585 ssp->dss_nslices = nslices; 586 ssp->dss_oflags = 0; 587 ssp->dss_secmult = lp->d_secsize / DEV_BSIZE; 588 if (ssp->dss_secmult & (ssp->dss_secmult - 1)) 589 ssp->dss_secshift = -1; 590 else 591 ssp->dss_secshift = ffs(ssp->dss_secmult) - 1; 592 ssp->dss_secsize = lp->d_secsize; 593 sp = &ssp->dss_slices[0]; 594 bzero(sp, nslices * sizeof *sp); 595 sp[WHOLE_DISK_SLICE].ds_size = lp->d_secperunit; 596 return (ssp); 597 } 598 599 char * 600 dsname(dev_t dev, int unit, int slice, int part, char *partname) 601 { 602 static char name[32]; 603 const char *dname; 604 605 dname = dev_dname(dev); 606 if (strlen(dname) > 16) 607 dname = "nametoolong"; 608 snprintf(name, sizeof(name), "%s%d", dname, unit); 609 partname[0] = '\0'; 610 if (slice != WHOLE_DISK_SLICE || part != RAW_PART) { 611 partname[0] = 'a' + part; 612 partname[1] = '\0'; 613 if (slice != COMPATIBILITY_SLICE) { 614 snprintf(name + strlen(name), 615 sizeof(name) - strlen(name), "s%d", slice - 1); 616 } 617 } 618 return (name); 619 } 620 621 /* 622 * This should only be called when the unit is inactive and the strategy 623 * routine should not allow it to become active unless we call it. Our 624 * strategy routine must be special to allow activity. 625 */ 626 int 627 dsopen(dev_t dev, int mode, u_int flags, 628 struct diskslices **sspp, struct disklabel *lp) 629 { 630 dev_t dev1; 631 int error; 632 struct disklabel *lp1; 633 char *msg; 634 u_char mask; 635 bool_t need_init; 636 int part; 637 char partname[2]; 638 int slice; 639 char *sname; 640 struct diskslice *sp; 641 struct diskslices *ssp; 642 int unit; 643 644 dev->si_bsize_phys = lp->d_secsize; 645 646 unit = dkunit(dev); 647 if (lp->d_secsize % DEV_BSIZE) { 648 printf("%s: invalid sector size %lu\n", devtoname(dev), 649 (u_long)lp->d_secsize); 650 return (EINVAL); 651 } 652 653 /* 654 * XXX reinitialize the slice table unless there is an open device 655 * on the unit. This should only be done if the media has changed. 656 */ 657 ssp = *sspp; 658 need_init = !dsisopen(ssp); 659 if (ssp != NULL && need_init) 660 dsgone(sspp); 661 if (need_init) { 662 /* 663 * Allocate a minimal slices "struct". This will become 664 * the final slices "struct" if we don't want real slices 665 * or if we can't find any real slices. 666 */ 667 *sspp = dsmakeslicestruct(BASE_SLICE, lp); 668 669 if (!(flags & DSO_ONESLICE)) { 670 TRACE(("dsinit\n")); 671 error = dsinit(dev, lp, sspp); 672 if (error != 0) { 673 dsgone(sspp); 674 return (error); 675 } 676 } 677 ssp = *sspp; 678 ssp->dss_oflags = flags; 679 680 /* 681 * If there are no real slices, then make the compatiblity 682 * slice cover the whole disk. 683 */ 684 if (ssp->dss_nslices == BASE_SLICE) 685 ssp->dss_slices[COMPATIBILITY_SLICE].ds_size 686 = lp->d_secperunit; 687 688 /* Point the compatibility slice at the BSD slice, if any. */ 689 for (slice = BASE_SLICE; slice < ssp->dss_nslices; slice++) { 690 sp = &ssp->dss_slices[slice]; 691 if (sp->ds_type == DOSPTYP_386BSD /* XXX */) { 692 ssp->dss_first_bsd_slice = slice; 693 ssp->dss_slices[COMPATIBILITY_SLICE].ds_offset 694 = sp->ds_offset; 695 ssp->dss_slices[COMPATIBILITY_SLICE].ds_size 696 = sp->ds_size; 697 ssp->dss_slices[COMPATIBILITY_SLICE].ds_type 698 = sp->ds_type; 699 break; 700 } 701 } 702 703 ssp->dss_slices[WHOLE_DISK_SLICE].ds_label = clone_label(lp); 704 ssp->dss_slices[WHOLE_DISK_SLICE].ds_wlabel = TRUE; 705 } 706 707 /* 708 * Initialize secondary info for all slices. It is needed for more 709 * than the current slice in the DEVFS case. XXX DEVFS is no more. 710 */ 711 for (slice = 0; slice < ssp->dss_nslices; slice++) { 712 sp = &ssp->dss_slices[slice]; 713 if (sp->ds_label != NULL) 714 continue; 715 dev1 = dkmodslice(dkmodpart(dev, RAW_PART), slice); 716 sname = dsname(dev, unit, slice, RAW_PART, partname); 717 /* 718 * XXX this should probably only be done for the need_init 719 * case, but there may be a problem with DIOCSYNCSLICEINFO. 720 */ 721 set_ds_wlabel(ssp, slice, TRUE); /* XXX invert */ 722 lp1 = clone_label(lp); 723 TRACE(("readdisklabel\n")); 724 if (flags & DSO_NOLABELS) 725 msg = NULL; 726 else { 727 msg = readdisklabel(dev1, lp1); 728 729 /* 730 * readdisklabel() returns NULL for success, and an 731 * error string for failure. 732 * 733 * If there isn't a label on the disk, and if the 734 * DSO_COMPATLABEL is set, we want to use the 735 * faked-up label provided by the caller. 736 * 737 * So we set msg to NULL to indicate that there is 738 * no failure (since we have a faked-up label), 739 * free lp1, and then clone it again from lp. 740 * (In case readdisklabel() modified lp1.) 741 */ 742 if (msg != NULL && (flags & DSO_COMPATLABEL)) { 743 msg = NULL; 744 free(lp1, M_DEVBUF); 745 lp1 = clone_label(lp); 746 } 747 } 748 if (msg == NULL) 749 msg = fixlabel(sname, sp, lp1, FALSE); 750 if (msg == NULL && lp1->d_secsize != ssp->dss_secsize) 751 msg = "inconsistent sector size"; 752 if (msg != NULL) { 753 if (sp->ds_type == DOSPTYP_386BSD /* XXX */) 754 log(LOG_WARNING, "%s: cannot find label (%s)\n", 755 sname, msg); 756 free(lp1, M_DEVBUF); 757 continue; 758 } 759 if (lp1->d_flags & D_BADSECT) { 760 log(LOG_ERR, "%s: bad sector table not supported\n", 761 sname); 762 free(lp1, M_DEVBUF); 763 continue; 764 } 765 set_ds_label(ssp, slice, lp1); 766 set_ds_wlabel(ssp, slice, FALSE); 767 } 768 769 slice = dkslice(dev); 770 if (slice >= ssp->dss_nslices) 771 return (ENXIO); 772 sp = &ssp->dss_slices[slice]; 773 part = dkpart(dev); 774 if (part != RAW_PART 775 && (sp->ds_label == NULL || part >= sp->ds_label->d_npartitions)) 776 return (EINVAL); /* XXX needs translation */ 777 mask = 1 << part; 778 sp->ds_openmask |= mask; 779 return (0); 780 } 781 782 int 783 dssize(dev_t dev, struct diskslices **sspp) 784 { 785 struct disklabel *lp; 786 int part; 787 int slice; 788 struct diskslices *ssp; 789 790 slice = dkslice(dev); 791 part = dkpart(dev); 792 ssp = *sspp; 793 if (ssp == NULL || slice >= ssp->dss_nslices 794 || !(ssp->dss_slices[slice].ds_openmask & (1 << part))) { 795 if (dev_dopen(dev, FREAD, S_IFCHR, NULL) != 0) 796 return (-1); 797 dev_dclose(dev, FREAD, S_IFCHR, NULL); 798 ssp = *sspp; 799 } 800 lp = ssp->dss_slices[slice].ds_label; 801 if (lp == NULL) 802 return (-1); 803 return ((int)lp->d_partitions[part].p_size); 804 } 805 806 static void 807 free_ds_label(struct diskslices *ssp, int slice) 808 { 809 struct disklabel *lp; 810 struct diskslice *sp; 811 812 sp = &ssp->dss_slices[slice]; 813 lp = sp->ds_label; 814 if (lp == NULL) 815 return; 816 free(lp, M_DEVBUF); 817 set_ds_label(ssp, slice, (struct disklabel *)NULL); 818 } 819 820 static char * 821 fixlabel(char *sname, struct diskslice *sp, struct disklabel *lp, int writeflag) 822 { 823 u_long end; 824 u_long offset; 825 int part; 826 struct partition *pp; 827 u_long start; 828 bool_t warned; 829 830 /* These errors "can't happen" so don't bother reporting details. */ 831 if (lp->d_magic != DISKMAGIC || lp->d_magic2 != DISKMAGIC) 832 return ("fixlabel: invalid magic"); 833 if (dkcksum(lp) != 0) 834 return ("fixlabel: invalid checksum"); 835 836 pp = &lp->d_partitions[RAW_PART]; 837 if (writeflag) { 838 start = 0; 839 offset = sp->ds_offset; 840 } else { 841 start = sp->ds_offset; 842 offset = -sp->ds_offset; 843 } 844 if (pp->p_offset != start) { 845 if (sname != NULL) { 846 printf( 847 "%s: rejecting BSD label: raw partition offset != slice offset\n", 848 sname); 849 slice_info(sname, sp); 850 partition_info(sname, RAW_PART, pp); 851 } 852 return ("fixlabel: raw partition offset != slice offset"); 853 } 854 if (pp->p_size != sp->ds_size) { 855 if (sname != NULL) { 856 printf("%s: raw partition size != slice size\n", sname); 857 slice_info(sname, sp); 858 partition_info(sname, RAW_PART, pp); 859 } 860 if (pp->p_size > sp->ds_size) { 861 if (sname == NULL) 862 return ("fixlabel: raw partition size > slice size"); 863 printf("%s: truncating raw partition\n", sname); 864 pp->p_size = sp->ds_size; 865 } 866 } 867 end = start + sp->ds_size; 868 if (start > end) 869 return ("fixlabel: slice wraps"); 870 if (lp->d_secpercyl <= 0) 871 return ("fixlabel: d_secpercyl <= 0"); 872 pp -= RAW_PART; 873 warned = FALSE; 874 for (part = 0; part < lp->d_npartitions; part++, pp++) { 875 if (pp->p_offset != 0 || pp->p_size != 0) { 876 if (pp->p_offset < start 877 || pp->p_offset + pp->p_size > end 878 || pp->p_offset + pp->p_size < pp->p_offset) { 879 if (sname != NULL) { 880 printf( 881 "%s: rejecting partition in BSD label: it isn't entirely within the slice\n", 882 sname); 883 if (!warned) { 884 slice_info(sname, sp); 885 warned = TRUE; 886 } 887 partition_info(sname, part, pp); 888 } 889 /* XXX else silently discard junk. */ 890 bzero(pp, sizeof *pp); 891 } else 892 pp->p_offset += offset; 893 } 894 } 895 lp->d_ncylinders = sp->ds_size / lp->d_secpercyl; 896 lp->d_secperunit = sp->ds_size; 897 lp->d_checksum = 0; 898 lp->d_checksum = dkcksum(lp); 899 return (NULL); 900 } 901 902 static void 903 partition_info(char *sname, int part, struct partition *pp) 904 { 905 printf("%s%c: start %lu, end %lu, size %lu\n", sname, 'a' + part, 906 (u_long)pp->p_offset, (u_long)(pp->p_offset + pp->p_size - 1), 907 (u_long)pp->p_size); 908 } 909 910 static void 911 slice_info(char *sname, struct diskslice *sp) 912 { 913 printf("%s: start %lu, end %lu, size %lu\n", sname, 914 sp->ds_offset, sp->ds_offset + sp->ds_size - 1, sp->ds_size); 915 } 916 917 static void 918 set_ds_label(struct diskslices *ssp, int slice, struct disklabel *lp) 919 { 920 ssp->dss_slices[slice].ds_label = lp; 921 if (slice == COMPATIBILITY_SLICE) 922 ssp->dss_slices[ssp->dss_first_bsd_slice].ds_label = lp; 923 else if (slice == ssp->dss_first_bsd_slice) 924 ssp->dss_slices[COMPATIBILITY_SLICE].ds_label = lp; 925 } 926 927 static void 928 set_ds_wlabel(struct diskslices *ssp, int slice, int wlabel) 929 { 930 ssp->dss_slices[slice].ds_wlabel = wlabel; 931 if (slice == COMPATIBILITY_SLICE) 932 ssp->dss_slices[ssp->dss_first_bsd_slice].ds_wlabel = wlabel; 933 else if (slice == ssp->dss_first_bsd_slice) 934 ssp->dss_slices[COMPATIBILITY_SLICE].ds_wlabel = wlabel; 935 } 936