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 1.10 2005/06/06 15:02:28 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/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_flags |= B_CALL; 249 bp->b_iodone = dsiodone; 250 bp->b_iodone_chain = ic; 251 if (!(bp->b_flags & B_READ)) { 252 /* 253 * XXX even disklabel(8) writes directly so we need 254 * to adjust writes. Perhaps we should drop support 255 * for DIOCWLABEL (always write protect labels) and 256 * require the use of DIOCWDINFO. 257 * 258 * XXX probably need to copy the data to avoid even 259 * temporarily corrupting the in-core copy. 260 */ 261 if (bp->b_vp != NULL) { 262 crit_enter(); 263 bp->b_vp->v_numoutput++; 264 crit_exit(); 265 } 266 /* XXX need name here. */ 267 msg = fixlabel((char *)NULL, sp, 268 (struct disklabel *) 269 (bp->b_data + ic->ic_args[0].ia_long), 270 TRUE); 271 if (msg != NULL) { 272 printf("dscheck(%s): %s\n", 273 devtoname(bp->b_dev), msg); 274 bp->b_error = EROFS; 275 goto bad; 276 } 277 } 278 } 279 return (1); 280 281 bad_bcount: 282 printf( 283 "dscheck(%s): b_bcount %ld is not on a sector boundary (ssize %d)\n", 284 devtoname(bp->b_dev), bp->b_bcount, ssp->dss_secsize); 285 bp->b_error = EINVAL; 286 goto bad; 287 288 bad_blkno: 289 printf( 290 "dscheck(%s): b_blkno %ld is not on a sector boundary (ssize %d)\n", 291 devtoname(bp->b_dev), (long)blkno, 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 (-1); 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 buf *bp) 536 { 537 struct iodone_chain *ic; 538 char *msg; 539 540 ic = bp->b_iodone_chain; 541 bp->b_flags = (ic->ic_prev_flags & B_CALL) 542 | (bp->b_flags & ~(B_CALL | B_DONE)); 543 bp->b_iodone = ic->ic_prev_iodone; 544 bp->b_iodone_chain = ic->ic_prev_iodone_chain; 545 if (!(bp->b_flags & B_READ) 546 || (!(bp->b_flags & B_ERROR) && bp->b_error == 0)) { 547 msg = fixlabel((char *)NULL, ic->ic_args[1].ia_ptr, 548 (struct disklabel *) 549 (bp->b_data + ic->ic_args[0].ia_long), 550 FALSE); 551 if (msg != NULL) 552 printf("%s\n", msg); 553 } 554 free(ic, M_DEVBUF); 555 biodone(bp); 556 } 557 558 int 559 dsisopen(struct diskslices *ssp) 560 { 561 int slice; 562 563 if (ssp == NULL) 564 return (0); 565 for (slice = 0; slice < ssp->dss_nslices; slice++) { 566 if (ssp->dss_slices[slice].ds_openmask) 567 return (1); 568 } 569 return (0); 570 } 571 572 /* 573 * Allocate a slices "struct" and initialize it to contain only an empty 574 * compatibility slice (pointing to itself), a whole disk slice (covering 575 * the disk as described by the label), and (nslices - BASE_SLICES) empty 576 * slices beginning at BASE_SLICE. 577 */ 578 struct diskslices * 579 dsmakeslicestruct(int nslices, struct disklabel *lp) 580 { 581 struct diskslice *sp; 582 struct diskslices *ssp; 583 584 ssp = malloc(offsetof(struct diskslices, dss_slices) + 585 nslices * sizeof *sp, M_DEVBUF, M_WAITOK); 586 ssp->dss_first_bsd_slice = COMPATIBILITY_SLICE; 587 ssp->dss_nslices = nslices; 588 ssp->dss_oflags = 0; 589 ssp->dss_secmult = lp->d_secsize / DEV_BSIZE; 590 if (ssp->dss_secmult & (ssp->dss_secmult - 1)) 591 ssp->dss_secshift = -1; 592 else 593 ssp->dss_secshift = ffs(ssp->dss_secmult) - 1; 594 ssp->dss_secsize = lp->d_secsize; 595 sp = &ssp->dss_slices[0]; 596 bzero(sp, nslices * sizeof *sp); 597 sp[WHOLE_DISK_SLICE].ds_size = lp->d_secperunit; 598 return (ssp); 599 } 600 601 char * 602 dsname(dev_t dev, int unit, int slice, int part, char *partname) 603 { 604 static char name[32]; 605 const char *dname; 606 607 dname = dev_dname(dev); 608 if (strlen(dname) > 16) 609 dname = "nametoolong"; 610 snprintf(name, sizeof(name), "%s%d", dname, unit); 611 partname[0] = '\0'; 612 if (slice != WHOLE_DISK_SLICE || part != RAW_PART) { 613 partname[0] = 'a' + part; 614 partname[1] = '\0'; 615 if (slice != COMPATIBILITY_SLICE) { 616 snprintf(name + strlen(name), 617 sizeof(name) - strlen(name), "s%d", slice - 1); 618 } 619 } 620 return (name); 621 } 622 623 /* 624 * This should only be called when the unit is inactive and the strategy 625 * routine should not allow it to become active unless we call it. Our 626 * strategy routine must be special to allow activity. 627 */ 628 int 629 dsopen(dev_t dev, int mode, u_int flags, 630 struct diskslices **sspp, struct disklabel *lp) 631 { 632 dev_t dev1; 633 int error; 634 struct disklabel *lp1; 635 char *msg; 636 u_char mask; 637 bool_t need_init; 638 int part; 639 char partname[2]; 640 int slice; 641 char *sname; 642 struct diskslice *sp; 643 struct diskslices *ssp; 644 int unit; 645 646 dev->si_bsize_phys = lp->d_secsize; 647 648 unit = dkunit(dev); 649 if (lp->d_secsize % DEV_BSIZE) { 650 printf("%s: invalid sector size %lu\n", devtoname(dev), 651 (u_long)lp->d_secsize); 652 return (EINVAL); 653 } 654 655 /* 656 * XXX reinitialize the slice table unless there is an open device 657 * on the unit. This should only be done if the media has changed. 658 */ 659 ssp = *sspp; 660 need_init = !dsisopen(ssp); 661 if (ssp != NULL && need_init) 662 dsgone(sspp); 663 if (need_init) { 664 /* 665 * Allocate a minimal slices "struct". This will become 666 * the final slices "struct" if we don't want real slices 667 * or if we can't find any real slices. 668 */ 669 *sspp = dsmakeslicestruct(BASE_SLICE, lp); 670 671 if (!(flags & DSO_ONESLICE)) { 672 TRACE(("dsinit\n")); 673 error = dsinit(dev, lp, sspp); 674 if (error != 0) { 675 dsgone(sspp); 676 return (error); 677 } 678 } 679 ssp = *sspp; 680 ssp->dss_oflags = flags; 681 682 /* 683 * If there are no real slices, then make the compatiblity 684 * slice cover the whole disk. 685 */ 686 if (ssp->dss_nslices == BASE_SLICE) 687 ssp->dss_slices[COMPATIBILITY_SLICE].ds_size 688 = lp->d_secperunit; 689 690 /* Point the compatibility slice at the BSD slice, if any. */ 691 for (slice = BASE_SLICE; slice < ssp->dss_nslices; slice++) { 692 sp = &ssp->dss_slices[slice]; 693 if (sp->ds_type == DOSPTYP_386BSD /* XXX */) { 694 ssp->dss_first_bsd_slice = slice; 695 ssp->dss_slices[COMPATIBILITY_SLICE].ds_offset 696 = sp->ds_offset; 697 ssp->dss_slices[COMPATIBILITY_SLICE].ds_size 698 = sp->ds_size; 699 ssp->dss_slices[COMPATIBILITY_SLICE].ds_type 700 = sp->ds_type; 701 break; 702 } 703 } 704 705 ssp->dss_slices[WHOLE_DISK_SLICE].ds_label = clone_label(lp); 706 ssp->dss_slices[WHOLE_DISK_SLICE].ds_wlabel = TRUE; 707 } 708 709 /* 710 * Initialize secondary info for all slices. It is needed for more 711 * than the current slice in the DEVFS case. XXX DEVFS is no more. 712 */ 713 for (slice = 0; slice < ssp->dss_nslices; slice++) { 714 sp = &ssp->dss_slices[slice]; 715 if (sp->ds_label != NULL) 716 continue; 717 dev1 = dkmodslice(dkmodpart(dev, RAW_PART), slice); 718 sname = dsname(dev, unit, slice, RAW_PART, partname); 719 /* 720 * XXX this should probably only be done for the need_init 721 * case, but there may be a problem with DIOCSYNCSLICEINFO. 722 */ 723 set_ds_wlabel(ssp, slice, TRUE); /* XXX invert */ 724 lp1 = clone_label(lp); 725 TRACE(("readdisklabel\n")); 726 if (flags & DSO_NOLABELS) 727 msg = NULL; 728 else { 729 msg = readdisklabel(dev1, lp1); 730 731 /* 732 * readdisklabel() returns NULL for success, and an 733 * error string for failure. 734 * 735 * If there isn't a label on the disk, and if the 736 * DSO_COMPATLABEL is set, we want to use the 737 * faked-up label provided by the caller. 738 * 739 * So we set msg to NULL to indicate that there is 740 * no failure (since we have a faked-up label), 741 * free lp1, and then clone it again from lp. 742 * (In case readdisklabel() modified lp1.) 743 */ 744 if (msg != NULL && (flags & DSO_COMPATLABEL)) { 745 msg = NULL; 746 free(lp1, M_DEVBUF); 747 lp1 = clone_label(lp); 748 } 749 } 750 if (msg == NULL) 751 msg = fixlabel(sname, sp, lp1, FALSE); 752 if (msg == NULL && lp1->d_secsize != ssp->dss_secsize) 753 msg = "inconsistent sector size"; 754 if (msg != NULL) { 755 if (sp->ds_type == DOSPTYP_386BSD /* XXX */) 756 log(LOG_WARNING, "%s: cannot find label (%s)\n", 757 sname, msg); 758 free(lp1, M_DEVBUF); 759 continue; 760 } 761 if (lp1->d_flags & D_BADSECT) { 762 log(LOG_ERR, "%s: bad sector table not supported\n", 763 sname); 764 free(lp1, M_DEVBUF); 765 continue; 766 } 767 set_ds_label(ssp, slice, lp1); 768 set_ds_wlabel(ssp, slice, FALSE); 769 } 770 771 slice = dkslice(dev); 772 if (slice >= ssp->dss_nslices) 773 return (ENXIO); 774 sp = &ssp->dss_slices[slice]; 775 part = dkpart(dev); 776 if (part != RAW_PART 777 && (sp->ds_label == NULL || part >= sp->ds_label->d_npartitions)) 778 return (EINVAL); /* XXX needs translation */ 779 mask = 1 << part; 780 sp->ds_openmask |= mask; 781 return (0); 782 } 783 784 int 785 dssize(dev_t dev, struct diskslices **sspp) 786 { 787 struct disklabel *lp; 788 int part; 789 int slice; 790 struct diskslices *ssp; 791 792 slice = dkslice(dev); 793 part = dkpart(dev); 794 ssp = *sspp; 795 if (ssp == NULL || slice >= ssp->dss_nslices 796 || !(ssp->dss_slices[slice].ds_openmask & (1 << part))) { 797 if (dev_dopen(dev, FREAD, S_IFCHR, NULL) != 0) 798 return (-1); 799 dev_dclose(dev, FREAD, S_IFCHR, NULL); 800 ssp = *sspp; 801 } 802 lp = ssp->dss_slices[slice].ds_label; 803 if (lp == NULL) 804 return (-1); 805 return ((int)lp->d_partitions[part].p_size); 806 } 807 808 static void 809 free_ds_label(struct diskslices *ssp, int slice) 810 { 811 struct disklabel *lp; 812 struct diskslice *sp; 813 814 sp = &ssp->dss_slices[slice]; 815 lp = sp->ds_label; 816 if (lp == NULL) 817 return; 818 free(lp, M_DEVBUF); 819 set_ds_label(ssp, slice, (struct disklabel *)NULL); 820 } 821 822 static char * 823 fixlabel(char *sname, struct diskslice *sp, struct disklabel *lp, int writeflag) 824 { 825 u_long end; 826 u_long offset; 827 int part; 828 struct partition *pp; 829 u_long start; 830 bool_t warned; 831 832 /* These errors "can't happen" so don't bother reporting details. */ 833 if (lp->d_magic != DISKMAGIC || lp->d_magic2 != DISKMAGIC) 834 return ("fixlabel: invalid magic"); 835 if (dkcksum(lp) != 0) 836 return ("fixlabel: invalid checksum"); 837 838 pp = &lp->d_partitions[RAW_PART]; 839 if (writeflag) { 840 start = 0; 841 offset = sp->ds_offset; 842 } else { 843 start = sp->ds_offset; 844 offset = -sp->ds_offset; 845 } 846 if (pp->p_offset != start) { 847 if (sname != NULL) { 848 printf( 849 "%s: rejecting BSD label: raw partition offset != slice offset\n", 850 sname); 851 slice_info(sname, sp); 852 partition_info(sname, RAW_PART, pp); 853 } 854 return ("fixlabel: raw partition offset != slice offset"); 855 } 856 if (pp->p_size != sp->ds_size) { 857 if (sname != NULL) { 858 printf("%s: raw partition size != slice size\n", sname); 859 slice_info(sname, sp); 860 partition_info(sname, RAW_PART, pp); 861 } 862 if (pp->p_size > sp->ds_size) { 863 if (sname == NULL) 864 return ("fixlabel: raw partition size > slice size"); 865 printf("%s: truncating raw partition\n", sname); 866 pp->p_size = sp->ds_size; 867 } 868 } 869 end = start + sp->ds_size; 870 if (start > end) 871 return ("fixlabel: slice wraps"); 872 if (lp->d_secpercyl <= 0) 873 return ("fixlabel: d_secpercyl <= 0"); 874 pp -= RAW_PART; 875 warned = FALSE; 876 for (part = 0; part < lp->d_npartitions; part++, pp++) { 877 if (pp->p_offset != 0 || pp->p_size != 0) { 878 if (pp->p_offset < start 879 || pp->p_offset + pp->p_size > end 880 || pp->p_offset + pp->p_size < pp->p_offset) { 881 if (sname != NULL) { 882 printf( 883 "%s: rejecting partition in BSD label: it isn't entirely within the slice\n", 884 sname); 885 if (!warned) { 886 slice_info(sname, sp); 887 warned = TRUE; 888 } 889 partition_info(sname, part, pp); 890 } 891 /* XXX else silently discard junk. */ 892 bzero(pp, sizeof *pp); 893 } else 894 pp->p_offset += offset; 895 } 896 } 897 lp->d_ncylinders = sp->ds_size / lp->d_secpercyl; 898 lp->d_secperunit = sp->ds_size; 899 lp->d_checksum = 0; 900 lp->d_checksum = dkcksum(lp); 901 return (NULL); 902 } 903 904 static void 905 partition_info(char *sname, int part, struct partition *pp) 906 { 907 printf("%s%c: start %lu, end %lu, size %lu\n", sname, 'a' + part, 908 (u_long)pp->p_offset, (u_long)(pp->p_offset + pp->p_size - 1), 909 (u_long)pp->p_size); 910 } 911 912 static void 913 slice_info(char *sname, struct diskslice *sp) 914 { 915 printf("%s: start %lu, end %lu, size %lu\n", sname, 916 sp->ds_offset, sp->ds_offset + sp->ds_size - 1, sp->ds_size); 917 } 918 919 static void 920 set_ds_label(struct diskslices *ssp, int slice, struct disklabel *lp) 921 { 922 ssp->dss_slices[slice].ds_label = lp; 923 if (slice == COMPATIBILITY_SLICE) 924 ssp->dss_slices[ssp->dss_first_bsd_slice].ds_label = lp; 925 else if (slice == ssp->dss_first_bsd_slice) 926 ssp->dss_slices[COMPATIBILITY_SLICE].ds_label = lp; 927 } 928 929 static void 930 set_ds_wlabel(struct diskslices *ssp, int slice, int wlabel) 931 { 932 ssp->dss_slices[slice].ds_wlabel = wlabel; 933 if (slice == COMPATIBILITY_SLICE) 934 ssp->dss_slices[ssp->dss_first_bsd_slice].ds_wlabel = wlabel; 935 else if (slice == ssp->dss_first_bsd_slice) 936 ssp->dss_slices[COMPATIBILITY_SLICE].ds_wlabel = wlabel; 937 } 938