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 1.4 2003/07/22 17:03:33 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/fcntl.h> 57 #include <sys/malloc.h> 58 #include <sys/stat.h> 59 #include <sys/syslog.h> 60 #include <sys/vnode.h> 61 #include <sys/device.h> 62 63 #include <ufs/ffs/fs.h> 64 65 #define TRACE(str) do { if (ds_debug) printf str; } while (0) 66 67 typedef u_char bool_t; 68 69 static volatile bool_t ds_debug; 70 71 static struct disklabel *clone_label __P((struct disklabel *lp)); 72 static void dsiodone __P((struct buf *bp)); 73 static char *fixlabel __P((char *sname, struct diskslice *sp, 74 struct disklabel *lp, int writeflag)); 75 static void free_ds_label __P((struct diskslices *ssp, int slice)); 76 static void partition_info __P((char *sname, int part, struct partition *pp)); 77 static void slice_info __P((char *sname, struct diskslice *sp)); 78 static void set_ds_label __P((struct diskslices *ssp, int slice, 79 struct disklabel *lp)); 80 static void set_ds_labeldevs __P((dev_t dev, struct diskslices *ssp)); 81 static void set_ds_wlabel __P((struct diskslices *ssp, int slice, 82 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(lp) 92 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 int 137 dscheck(bp, ssp) 138 struct buf *bp; 139 struct diskslices *ssp; 140 { 141 daddr_t blkno; 142 u_long endsecno; 143 daddr_t labelsect; 144 struct disklabel *lp; 145 char *msg; 146 long nsec; 147 struct partition *pp; 148 daddr_t secno; 149 daddr_t slicerel_secno; 150 struct diskslice *sp; 151 int s; 152 153 blkno = bp->b_blkno; 154 if (blkno < 0) { 155 printf("dscheck(%s): negative b_blkno %ld\n", 156 devtoname(bp->b_dev), (long)blkno); 157 bp->b_error = EINVAL; 158 goto bad; 159 } 160 sp = &ssp->dss_slices[dkslice(bp->b_dev)]; 161 lp = sp->ds_label; 162 if (ssp->dss_secmult == 1) { 163 if (bp->b_bcount % (u_long)DEV_BSIZE) 164 goto bad_bcount; 165 secno = blkno; 166 nsec = bp->b_bcount >> DEV_BSHIFT; 167 } else if (ssp->dss_secshift != -1) { 168 if (bp->b_bcount & (ssp->dss_secsize - 1)) 169 goto bad_bcount; 170 if (blkno & (ssp->dss_secmult - 1)) 171 goto bad_blkno; 172 secno = blkno >> ssp->dss_secshift; 173 nsec = bp->b_bcount >> (DEV_BSHIFT + ssp->dss_secshift); 174 } else { 175 if (bp->b_bcount % ssp->dss_secsize) 176 goto bad_bcount; 177 if (blkno % ssp->dss_secmult) 178 goto bad_blkno; 179 secno = blkno / ssp->dss_secmult; 180 nsec = bp->b_bcount / ssp->dss_secsize; 181 } 182 if (lp == NULL) { 183 labelsect = -LABELSECTOR - 1; 184 endsecno = sp->ds_size; 185 slicerel_secno = secno; 186 } else { 187 labelsect = lp->d_partitions[LABEL_PART].p_offset; 188 if (labelsect != 0) Debugger("labelsect != 0 in dscheck()"); 189 pp = &lp->d_partitions[dkpart(bp->b_dev)]; 190 endsecno = pp->p_size; 191 slicerel_secno = pp->p_offset + secno; 192 } 193 194 /* overwriting disk label ? */ 195 /* XXX should also protect bootstrap in first 8K */ 196 if (slicerel_secno <= LABELSECTOR + labelsect && 197 #if LABELSECTOR != 0 198 slicerel_secno + nsec > LABELSECTOR + labelsect && 199 #endif 200 (bp->b_flags & B_READ) == 0 && sp->ds_wlabel == 0) { 201 bp->b_error = EROFS; 202 goto bad; 203 } 204 205 #if defined(DOSBBSECTOR) && defined(notyet) 206 /* overwriting master boot record? */ 207 if (slicerel_secno <= DOSBBSECTOR && (bp->b_flags & B_READ) == 0 && 208 sp->ds_wlabel == 0) { 209 bp->b_error = EROFS; 210 goto bad; 211 } 212 #endif 213 214 /* beyond partition? */ 215 if (secno + nsec > endsecno) { 216 /* if exactly at end of disk, return an EOF */ 217 if (secno == endsecno) { 218 bp->b_resid = bp->b_bcount; 219 return (0); 220 } 221 /* or truncate if part of it fits */ 222 nsec = endsecno - secno; 223 if (nsec <= 0) { 224 bp->b_error = EINVAL; 225 goto bad; 226 } 227 bp->b_bcount = nsec * ssp->dss_secsize; 228 } 229 230 bp->b_pblkno = sp->ds_offset + slicerel_secno; 231 232 /* 233 * Snoop on label accesses if the slice offset is nonzero. Fudge 234 * offsets in the label to keep the in-core label coherent with 235 * the on-disk one. 236 */ 237 if (slicerel_secno <= LABELSECTOR + labelsect 238 #if LABELSECTOR != 0 239 && slicerel_secno + nsec > LABELSECTOR + labelsect 240 #endif 241 && sp->ds_offset != 0) { 242 struct iodone_chain *ic; 243 244 ic = malloc(sizeof *ic , M_DEVBUF, M_WAITOK); 245 ic->ic_prev_flags = bp->b_flags; 246 ic->ic_prev_iodone = bp->b_iodone; 247 ic->ic_prev_iodone_chain = bp->b_iodone_chain; 248 ic->ic_args[0].ia_long = (LABELSECTOR + labelsect - 249 slicerel_secno) * ssp->dss_secsize; 250 ic->ic_args[1].ia_ptr = sp; 251 bp->b_flags |= B_CALL; 252 bp->b_iodone = dsiodone; 253 bp->b_iodone_chain = ic; 254 if (!(bp->b_flags & B_READ)) { 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 if (bp->b_vp != NULL) { 265 s = splbio(); 266 bp->b_vp->v_numoutput++; 267 splx(s); 268 } 269 /* XXX need name here. */ 270 msg = fixlabel((char *)NULL, sp, 271 (struct disklabel *) 272 (bp->b_data + ic->ic_args[0].ia_long), 273 TRUE); 274 if (msg != NULL) { 275 printf("dscheck(%s): %s\n", 276 devtoname(bp->b_dev), msg); 277 bp->b_error = EROFS; 278 goto bad; 279 } 280 } 281 } 282 return (1); 283 284 bad_bcount: 285 printf( 286 "dscheck(%s): b_bcount %ld is not on a sector boundary (ssize %d)\n", 287 devtoname(bp->b_dev), bp->b_bcount, ssp->dss_secsize); 288 bp->b_error = EINVAL; 289 goto bad; 290 291 bad_blkno: 292 printf( 293 "dscheck(%s): b_blkno %ld is not on a sector boundary (ssize %d)\n", 294 devtoname(bp->b_dev), (long)blkno, ssp->dss_secsize); 295 bp->b_error = EINVAL; 296 goto bad; 297 298 bad: 299 bp->b_resid = bp->b_bcount; 300 bp->b_flags |= B_ERROR; 301 return (-1); 302 } 303 304 void 305 dsclose(dev, mode, ssp) 306 dev_t dev; 307 int mode; 308 struct diskslices *ssp; 309 { 310 u_char mask; 311 struct diskslice *sp; 312 313 sp = &ssp->dss_slices[dkslice(dev)]; 314 mask = 1 << dkpart(dev); 315 sp->ds_openmask &= ~mask; 316 } 317 318 void 319 dsgone(sspp) 320 struct diskslices **sspp; 321 { 322 int slice; 323 struct diskslice *sp; 324 struct diskslices *ssp; 325 326 for (slice = 0, ssp = *sspp; slice < ssp->dss_nslices; slice++) { 327 sp = &ssp->dss_slices[slice]; 328 free_ds_label(ssp, slice); 329 } 330 free(ssp, M_DEVBUF); 331 *sspp = NULL; 332 } 333 334 /* 335 * For the "write" commands (DIOCSDINFO and DIOCWDINFO), this 336 * is subject to the same restriction as dsopen(). 337 */ 338 int 339 dsioctl(dev, cmd, data, flags, sspp) 340 dev_t dev; 341 u_long cmd; 342 caddr_t data; 343 int flags; 344 struct diskslices **sspp; 345 { 346 int error; 347 struct disklabel *lp; 348 int old_wlabel; 349 u_char openmask; 350 int part; 351 int slice; 352 struct diskslice *sp; 353 struct diskslices *ssp; 354 struct partition *pp; 355 356 slice = dkslice(dev); 357 ssp = *sspp; 358 sp = &ssp->dss_slices[slice]; 359 lp = sp->ds_label; 360 switch (cmd) { 361 362 case DIOCGDVIRGIN: 363 lp = (struct disklabel *)data; 364 if (ssp->dss_slices[WHOLE_DISK_SLICE].ds_label) { 365 *lp = *ssp->dss_slices[WHOLE_DISK_SLICE].ds_label; 366 } else { 367 bzero(lp, sizeof(struct disklabel)); 368 } 369 370 lp->d_magic = DISKMAGIC; 371 lp->d_magic2 = DISKMAGIC; 372 pp = &lp->d_partitions[RAW_PART]; 373 pp->p_offset = 0; 374 pp->p_size = sp->ds_size; 375 376 lp->d_npartitions = MAXPARTITIONS; 377 if (lp->d_interleave == 0) 378 lp->d_interleave = 1; 379 if (lp->d_rpm == 0) 380 lp->d_rpm = 3600; 381 if (lp->d_nsectors == 0) 382 lp->d_nsectors = 32; 383 if (lp->d_ntracks == 0) 384 lp->d_ntracks = 64; 385 386 lp->d_bbsize = BBSIZE; 387 lp->d_sbsize = SBSIZE; 388 lp->d_secpercyl = lp->d_nsectors * lp->d_ntracks; 389 lp->d_ncylinders = sp->ds_size / lp->d_secpercyl; 390 lp->d_secperunit = sp->ds_size; 391 lp->d_checksum = 0; 392 lp->d_checksum = dkcksum(lp); 393 return (0); 394 395 case DIOCGDINFO: 396 if (lp == NULL) 397 return (EINVAL); 398 *(struct disklabel *)data = *lp; 399 return (0); 400 401 #ifdef notyet 402 case DIOCGDINFOP: 403 if (lp == NULL) 404 return (EINVAL); 405 *(struct disklabel **)data = lp; 406 return (0); 407 #endif 408 409 case DIOCGPART: 410 if (lp == NULL) 411 return (EINVAL); 412 ((struct partinfo *)data)->disklab = lp; 413 ((struct partinfo *)data)->part 414 = &lp->d_partitions[dkpart(dev)]; 415 return (0); 416 417 case DIOCGSLICEINFO: 418 bcopy(ssp, data, (char *)&ssp->dss_slices[ssp->dss_nslices] - 419 (char *)ssp); 420 return (0); 421 422 case DIOCSDINFO: 423 if (slice == WHOLE_DISK_SLICE) 424 return (ENODEV); 425 if (!(flags & FWRITE)) 426 return (EBADF); 427 lp = malloc(sizeof *lp, M_DEVBUF, M_WAITOK); 428 if (sp->ds_label == NULL) 429 bzero(lp, sizeof *lp); 430 else 431 bcopy(sp->ds_label, lp, sizeof *lp); 432 if (sp->ds_label == NULL) 433 openmask = 0; 434 else { 435 openmask = sp->ds_openmask; 436 if (slice == COMPATIBILITY_SLICE) 437 openmask |= ssp->dss_slices[ 438 ssp->dss_first_bsd_slice].ds_openmask; 439 else if (slice == ssp->dss_first_bsd_slice) 440 openmask |= ssp->dss_slices[ 441 COMPATIBILITY_SLICE].ds_openmask; 442 } 443 error = setdisklabel(lp, (struct disklabel *)data, 444 (u_long)openmask); 445 /* XXX why doesn't setdisklabel() check this? */ 446 if (error == 0 && lp->d_partitions[RAW_PART].p_offset != 0) 447 error = EXDEV; 448 if (error == 0) { 449 if (lp->d_secperunit > sp->ds_size) 450 error = ENOSPC; 451 for (part = 0; part < lp->d_npartitions; part++) 452 if (lp->d_partitions[part].p_size > sp->ds_size) 453 error = ENOSPC; 454 } 455 if (error != 0) { 456 free(lp, M_DEVBUF); 457 return (error); 458 } 459 free_ds_label(ssp, slice); 460 set_ds_label(ssp, slice, lp); 461 set_ds_labeldevs(dev, ssp); 462 return (0); 463 464 case DIOCSYNCSLICEINFO: 465 if (slice != WHOLE_DISK_SLICE || dkpart(dev) != RAW_PART) 466 return (EINVAL); 467 if (!*(int *)data) 468 for (slice = 0; slice < ssp->dss_nslices; slice++) { 469 openmask = ssp->dss_slices[slice].ds_openmask; 470 if (openmask 471 && (slice != WHOLE_DISK_SLICE 472 || openmask & ~(1 << RAW_PART))) 473 return (EBUSY); 474 } 475 476 /* 477 * Temporarily forget the current slices struct and read 478 * the current one. 479 * XXX should wait for current accesses on this disk to 480 * complete, then lock out future accesses and opens. 481 */ 482 *sspp = NULL; 483 lp = malloc(sizeof *lp, M_DEVBUF, M_WAITOK); 484 *lp = *ssp->dss_slices[WHOLE_DISK_SLICE].ds_label; 485 error = dsopen(dev, S_IFCHR, ssp->dss_oflags, sspp, lp); 486 if (error != 0) { 487 free(lp, M_DEVBUF); 488 *sspp = ssp; 489 return (error); 490 } 491 492 /* 493 * Reopen everything. This is a no-op except in the "force" 494 * case and when the raw bdev and cdev are both open. Abort 495 * if anything fails. 496 */ 497 for (slice = 0; slice < ssp->dss_nslices; slice++) { 498 for (openmask = ssp->dss_slices[slice].ds_openmask, 499 part = 0; openmask; openmask >>= 1, part++) { 500 if (!(openmask & 1)) 501 continue; 502 error = dsopen(dkmodslice(dkmodpart(dev, part), 503 slice), 504 S_IFCHR, ssp->dss_oflags, sspp, 505 lp); 506 if (error != 0) { 507 free(lp, M_DEVBUF); 508 *sspp = ssp; 509 return (EBUSY); 510 } 511 } 512 } 513 514 free(lp, M_DEVBUF); 515 dsgone(&ssp); 516 return (0); 517 518 case DIOCWDINFO: 519 error = dsioctl(dev, DIOCSDINFO, data, flags, &ssp); 520 if (error != 0) 521 return (error); 522 /* 523 * XXX this used to hack on dk_openpart to fake opening 524 * partition 0 in case that is used instead of dkpart(dev). 525 */ 526 old_wlabel = sp->ds_wlabel; 527 set_ds_wlabel(ssp, slice, TRUE); 528 error = writedisklabel(dev, sp->ds_label); 529 /* XXX should invalidate in-core label if write failed. */ 530 set_ds_wlabel(ssp, slice, old_wlabel); 531 return (error); 532 533 case DIOCWLABEL: 534 #ifndef __alpha__ 535 if (slice == WHOLE_DISK_SLICE) 536 return (ENODEV); 537 #endif 538 if (!(flags & FWRITE)) 539 return (EBADF); 540 set_ds_wlabel(ssp, slice, *(int *)data != 0); 541 return (0); 542 543 default: 544 return (ENOIOCTL); 545 } 546 } 547 548 static void 549 dsiodone(bp) 550 struct buf *bp; 551 { 552 struct iodone_chain *ic; 553 char *msg; 554 555 ic = bp->b_iodone_chain; 556 bp->b_flags = (ic->ic_prev_flags & B_CALL) 557 | (bp->b_flags & ~(B_CALL | B_DONE)); 558 bp->b_iodone = ic->ic_prev_iodone; 559 bp->b_iodone_chain = ic->ic_prev_iodone_chain; 560 if (!(bp->b_flags & B_READ) 561 || (!(bp->b_flags & B_ERROR) && bp->b_error == 0)) { 562 msg = fixlabel((char *)NULL, ic->ic_args[1].ia_ptr, 563 (struct disklabel *) 564 (bp->b_data + ic->ic_args[0].ia_long), 565 FALSE); 566 if (msg != NULL) 567 printf("%s\n", msg); 568 } 569 free(ic, M_DEVBUF); 570 biodone(bp); 571 } 572 573 int 574 dsisopen(ssp) 575 struct diskslices *ssp; 576 { 577 int slice; 578 579 if (ssp == NULL) 580 return (0); 581 for (slice = 0; slice < ssp->dss_nslices; slice++) 582 if (ssp->dss_slices[slice].ds_openmask) 583 return (1); 584 return (0); 585 } 586 587 /* 588 * Allocate a slices "struct" and initialize it to contain only an empty 589 * compatibility slice (pointing to itself), a whole disk slice (covering 590 * the disk as described by the label), and (nslices - BASE_SLICES) empty 591 * slices beginning at BASE_SLICE. 592 */ 593 struct diskslices * 594 dsmakeslicestruct(nslices, lp) 595 int nslices; 596 struct disklabel *lp; 597 { 598 struct diskslice *sp; 599 struct diskslices *ssp; 600 601 ssp = malloc(offsetof(struct diskslices, dss_slices) + 602 nslices * sizeof *sp, M_DEVBUF, M_WAITOK); 603 ssp->dss_first_bsd_slice = COMPATIBILITY_SLICE; 604 ssp->dss_nslices = nslices; 605 ssp->dss_oflags = 0; 606 ssp->dss_secmult = lp->d_secsize / DEV_BSIZE; 607 if (ssp->dss_secmult & (ssp->dss_secmult - 1)) 608 ssp->dss_secshift = -1; 609 else 610 ssp->dss_secshift = ffs(ssp->dss_secmult) - 1; 611 ssp->dss_secsize = lp->d_secsize; 612 sp = &ssp->dss_slices[0]; 613 bzero(sp, nslices * sizeof *sp); 614 sp[WHOLE_DISK_SLICE].ds_size = lp->d_secperunit; 615 return (ssp); 616 } 617 618 char * 619 dsname(dev, unit, slice, part, partname) 620 dev_t dev; 621 int unit; 622 int slice; 623 int part; 624 char *partname; 625 { 626 static char name[32]; 627 const char *dname; 628 629 dname = dev_dname(dev); 630 if (strlen(dname) > 16) 631 dname = "nametoolong"; 632 snprintf(name, sizeof(name), "%s%d", dname, unit); 633 partname[0] = '\0'; 634 if (slice != WHOLE_DISK_SLICE || part != RAW_PART) { 635 partname[0] = 'a' + part; 636 partname[1] = '\0'; 637 if (slice != COMPATIBILITY_SLICE) 638 snprintf(name + strlen(name), 639 sizeof(name) - strlen(name), "s%d", slice - 1); 640 } 641 return (name); 642 } 643 644 /* 645 * This should only be called when the unit is inactive and the strategy 646 * routine should not allow it to become active unless we call it. Our 647 * strategy routine must be special to allow activity. 648 */ 649 int 650 dsopen(dev, mode, flags, sspp, lp) 651 dev_t dev; 652 int mode; 653 u_int flags; 654 struct diskslices **sspp; 655 struct disklabel *lp; 656 { 657 dev_t dev1; 658 int error; 659 struct disklabel *lp1; 660 char *msg; 661 u_char mask; 662 bool_t need_init; 663 int part; 664 char partname[2]; 665 int slice; 666 char *sname; 667 struct diskslice *sp; 668 struct diskslices *ssp; 669 int unit; 670 671 dev->si_bsize_phys = lp->d_secsize; 672 673 unit = dkunit(dev); 674 if (lp->d_secsize % DEV_BSIZE) { 675 printf("%s: invalid sector size %lu\n", devtoname(dev), 676 (u_long)lp->d_secsize); 677 return (EINVAL); 678 } 679 680 /* 681 * XXX reinitialize the slice table unless there is an open device 682 * on the unit. This should only be done if the media has changed. 683 */ 684 ssp = *sspp; 685 need_init = !dsisopen(ssp); 686 if (ssp != NULL && need_init) 687 dsgone(sspp); 688 if (need_init) { 689 /* 690 * Allocate a minimal slices "struct". This will become 691 * the final slices "struct" if we don't want real slices 692 * or if we can't find any real slices. 693 */ 694 *sspp = dsmakeslicestruct(BASE_SLICE, lp); 695 696 if (!(flags & DSO_ONESLICE)) { 697 TRACE(("dsinit\n")); 698 error = dsinit(dev, lp, sspp); 699 if (error != 0) { 700 dsgone(sspp); 701 return (error); 702 } 703 } 704 ssp = *sspp; 705 ssp->dss_oflags = flags; 706 707 /* 708 * If there are no real slices, then make the compatiblity 709 * slice cover the whole disk. 710 */ 711 if (ssp->dss_nslices == BASE_SLICE) 712 ssp->dss_slices[COMPATIBILITY_SLICE].ds_size 713 = lp->d_secperunit; 714 715 /* Point the compatibility slice at the BSD slice, if any. */ 716 for (slice = BASE_SLICE; slice < ssp->dss_nslices; slice++) { 717 sp = &ssp->dss_slices[slice]; 718 if (sp->ds_type == DOSPTYP_386BSD /* XXX */) { 719 ssp->dss_first_bsd_slice = slice; 720 ssp->dss_slices[COMPATIBILITY_SLICE].ds_offset 721 = sp->ds_offset; 722 ssp->dss_slices[COMPATIBILITY_SLICE].ds_size 723 = sp->ds_size; 724 ssp->dss_slices[COMPATIBILITY_SLICE].ds_type 725 = sp->ds_type; 726 break; 727 } 728 } 729 730 ssp->dss_slices[WHOLE_DISK_SLICE].ds_label = clone_label(lp); 731 ssp->dss_slices[WHOLE_DISK_SLICE].ds_wlabel = TRUE; 732 } 733 734 /* 735 * Initialize secondary info for all slices. It is needed for more 736 * than the current slice in the DEVFS case. XXX DEVFS is no more. 737 */ 738 for (slice = 0; slice < ssp->dss_nslices; slice++) { 739 sp = &ssp->dss_slices[slice]; 740 if (sp->ds_label != NULL 741 #ifdef __alpha__ 742 && slice != WHOLE_DISK_SLICE 743 #endif 744 ) 745 continue; 746 dev1 = dkmodslice(dkmodpart(dev, RAW_PART), slice); 747 sname = dsname(dev, unit, slice, RAW_PART, partname); 748 /* 749 * XXX this should probably only be done for the need_init 750 * case, but there may be a problem with DIOCSYNCSLICEINFO. 751 */ 752 set_ds_wlabel(ssp, slice, TRUE); /* XXX invert */ 753 lp1 = clone_label(lp); 754 TRACE(("readdisklabel\n")); 755 if (flags & DSO_NOLABELS) 756 msg = NULL; 757 else { 758 msg = readdisklabel(dev1, lp1); 759 760 /* 761 * readdisklabel() returns NULL for success, and an 762 * error string for failure. 763 * 764 * If there isn't a label on the disk, and if the 765 * DSO_COMPATLABEL is set, we want to use the 766 * faked-up label provided by the caller. 767 * 768 * So we set msg to NULL to indicate that there is 769 * no failure (since we have a faked-up label), 770 * free lp1, and then clone it again from lp. 771 * (In case readdisklabel() modified lp1.) 772 */ 773 if (msg != NULL && (flags & DSO_COMPATLABEL)) { 774 msg = NULL; 775 free(lp1, M_DEVBUF); 776 lp1 = clone_label(lp); 777 } 778 } 779 if (msg == NULL) 780 msg = fixlabel(sname, sp, lp1, FALSE); 781 if (msg == NULL && lp1->d_secsize != ssp->dss_secsize) 782 msg = "inconsistent sector size"; 783 if (msg != NULL) { 784 if (sp->ds_type == DOSPTYP_386BSD /* XXX */) 785 log(LOG_WARNING, "%s: cannot find label (%s)\n", 786 sname, msg); 787 free(lp1, M_DEVBUF); 788 continue; 789 } 790 if (lp1->d_flags & D_BADSECT) { 791 log(LOG_ERR, "%s: bad sector table not supported\n", 792 sname); 793 free(lp1, M_DEVBUF); 794 continue; 795 } 796 set_ds_label(ssp, slice, lp1); 797 set_ds_labeldevs(dev1, ssp); 798 set_ds_wlabel(ssp, slice, FALSE); 799 } 800 801 slice = dkslice(dev); 802 if (slice >= ssp->dss_nslices) 803 return (ENXIO); 804 sp = &ssp->dss_slices[slice]; 805 part = dkpart(dev); 806 if (part != RAW_PART 807 && (sp->ds_label == NULL || part >= sp->ds_label->d_npartitions)) 808 return (EINVAL); /* XXX needs translation */ 809 mask = 1 << part; 810 sp->ds_openmask |= mask; 811 return (0); 812 } 813 814 int 815 dssize(dev, sspp) 816 dev_t dev; 817 struct diskslices **sspp; 818 { 819 struct disklabel *lp; 820 int part; 821 int slice; 822 struct diskslices *ssp; 823 824 slice = dkslice(dev); 825 part = dkpart(dev); 826 ssp = *sspp; 827 if (ssp == NULL || slice >= ssp->dss_nslices 828 || !(ssp->dss_slices[slice].ds_openmask & (1 << part))) { 829 if (dev_dopen(dev, FREAD, S_IFCHR, NULL) != 0) 830 return (-1); 831 dev_dclose(dev, FREAD, S_IFCHR, NULL); 832 ssp = *sspp; 833 } 834 lp = ssp->dss_slices[slice].ds_label; 835 if (lp == NULL) 836 return (-1); 837 return ((int)lp->d_partitions[part].p_size); 838 } 839 840 static void 841 free_ds_label(ssp, slice) 842 struct diskslices *ssp; 843 int slice; 844 { 845 struct disklabel *lp; 846 struct diskslice *sp; 847 848 sp = &ssp->dss_slices[slice]; 849 lp = sp->ds_label; 850 if (lp == NULL) 851 return; 852 free(lp, M_DEVBUF); 853 set_ds_label(ssp, slice, (struct disklabel *)NULL); 854 } 855 856 static char * 857 fixlabel(sname, sp, lp, writeflag) 858 char *sname; 859 struct diskslice *sp; 860 struct disklabel *lp; 861 int writeflag; 862 { 863 u_long end; 864 u_long offset; 865 int part; 866 struct partition *pp; 867 u_long start; 868 bool_t warned; 869 870 /* These errors "can't happen" so don't bother reporting details. */ 871 if (lp->d_magic != DISKMAGIC || lp->d_magic2 != DISKMAGIC) 872 return ("fixlabel: invalid magic"); 873 if (dkcksum(lp) != 0) 874 return ("fixlabel: invalid checksum"); 875 876 pp = &lp->d_partitions[RAW_PART]; 877 if (writeflag) { 878 start = 0; 879 offset = sp->ds_offset; 880 } else { 881 start = sp->ds_offset; 882 offset = -sp->ds_offset; 883 } 884 if (pp->p_offset != start) { 885 if (sname != NULL) { 886 printf( 887 "%s: rejecting BSD label: raw partition offset != slice offset\n", 888 sname); 889 slice_info(sname, sp); 890 partition_info(sname, RAW_PART, pp); 891 } 892 return ("fixlabel: raw partition offset != slice offset"); 893 } 894 if (pp->p_size != sp->ds_size) { 895 if (sname != NULL) { 896 printf("%s: raw partition size != slice size\n", sname); 897 slice_info(sname, sp); 898 partition_info(sname, RAW_PART, pp); 899 } 900 if (pp->p_size > sp->ds_size) { 901 if (sname == NULL) 902 return ("fixlabel: raw partition size > slice size"); 903 printf("%s: truncating raw partition\n", sname); 904 pp->p_size = sp->ds_size; 905 } 906 } 907 end = start + sp->ds_size; 908 if (start > end) 909 return ("fixlabel: slice wraps"); 910 if (lp->d_secpercyl <= 0) 911 return ("fixlabel: d_secpercyl <= 0"); 912 pp -= RAW_PART; 913 warned = FALSE; 914 for (part = 0; part < lp->d_npartitions; part++, pp++) { 915 if (pp->p_offset != 0 || pp->p_size != 0) { 916 if (pp->p_offset < start 917 || pp->p_offset + pp->p_size > end 918 || pp->p_offset + pp->p_size < pp->p_offset) { 919 if (sname != NULL) { 920 printf( 921 "%s: rejecting partition in BSD label: it isn't entirely within the slice\n", 922 sname); 923 if (!warned) { 924 slice_info(sname, sp); 925 warned = TRUE; 926 } 927 partition_info(sname, part, pp); 928 } 929 /* XXX else silently discard junk. */ 930 bzero(pp, sizeof *pp); 931 } else 932 pp->p_offset += offset; 933 } 934 } 935 lp->d_ncylinders = sp->ds_size / lp->d_secpercyl; 936 lp->d_secperunit = sp->ds_size; 937 lp->d_checksum = 0; 938 lp->d_checksum = dkcksum(lp); 939 return (NULL); 940 } 941 942 static void 943 partition_info(sname, part, pp) 944 char *sname; 945 int part; 946 struct partition *pp; 947 { 948 printf("%s%c: start %lu, end %lu, size %lu\n", sname, 'a' + part, 949 (u_long)pp->p_offset, (u_long)(pp->p_offset + pp->p_size - 1), 950 (u_long)pp->p_size); 951 } 952 953 static void 954 slice_info(sname, sp) 955 char *sname; 956 struct diskslice *sp; 957 { 958 printf("%s: start %lu, end %lu, size %lu\n", sname, 959 sp->ds_offset, sp->ds_offset + sp->ds_size - 1, sp->ds_size); 960 } 961 962 static void 963 set_ds_label(ssp, slice, lp) 964 struct diskslices *ssp; 965 int slice; 966 struct disklabel *lp; 967 { 968 ssp->dss_slices[slice].ds_label = lp; 969 if (slice == COMPATIBILITY_SLICE) 970 ssp->dss_slices[ssp->dss_first_bsd_slice].ds_label = lp; 971 else if (slice == ssp->dss_first_bsd_slice) 972 ssp->dss_slices[COMPATIBILITY_SLICE].ds_label = lp; 973 } 974 975 /* XXX remove this? */ 976 static void 977 set_ds_labeldevs(dev, ssp) 978 dev_t dev; 979 struct diskslices *ssp; 980 { 981 } 982 983 static void 984 set_ds_wlabel(ssp, slice, wlabel) 985 struct diskslices *ssp; 986 int slice; 987 int wlabel; 988 { 989 ssp->dss_slices[slice].ds_wlabel = wlabel; 990 if (slice == COMPATIBILITY_SLICE) 991 ssp->dss_slices[ssp->dss_first_bsd_slice].ds_wlabel = wlabel; 992 else if (slice == ssp->dss_first_bsd_slice) 993 ssp->dss_slices[COMPATIBILITY_SLICE].ds_wlabel = wlabel; 994 } 995