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 1.51 2008/08/29 20:08:36 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/disklabel32.h> 56 #include <sys/disklabel64.h> 57 #include <sys/diskslice.h> 58 #include <sys/disk.h> 59 #include <sys/diskmbr.h> 60 #include <sys/fcntl.h> 61 #include <sys/malloc.h> 62 #include <sys/stat.h> 63 #include <sys/syslog.h> 64 #include <sys/proc.h> 65 #include <sys/vnode.h> 66 #include <sys/device.h> 67 #include <sys/thread2.h> 68 69 #include <vfs/ufs/dinode.h> /* XXX used only for fs.h */ 70 #include <vfs/ufs/fs.h> /* XXX used only to get BBSIZE/SBSIZE */ 71 #include <sys/devfs.h> 72 73 static int dsreadandsetlabel(cdev_t dev, u_int flags, 74 struct diskslices *ssp, struct diskslice *sp, 75 struct disk_info *info); 76 static void free_ds_label (struct diskslices *ssp, int slice); 77 static void set_ds_label (struct diskslices *ssp, int slice, disklabel_t lp, 78 disklabel_ops_t ops); 79 static void set_ds_wlabel (struct diskslices *ssp, int slice, int wlabel); 80 81 /* 82 * Determine the size of the transfer, and make sure it is 83 * within the boundaries of the partition. Adjust transfer 84 * if needed, and signal errors or early completion. 85 * 86 * XXX TODO: 87 * o Split buffers that are too big for the device. 88 * o Check for overflow. 89 * o Finish cleaning this up. 90 * 91 * This function returns 1 on success, 0 if transfer equates 92 * to EOF (end of disk) or -1 on failure. The appropriate 93 * 'errno' value is also set in bp->b_error and bp->b_flags 94 * is marked with B_ERROR. 95 */ 96 struct bio * 97 dscheck(cdev_t dev, struct bio *bio, struct diskslices *ssp) 98 { 99 struct buf *bp = bio->bio_buf; 100 struct bio *nbio; 101 disklabel_t lp; 102 disklabel_ops_t ops; 103 long nsec; 104 u_int64_t secno; 105 u_int64_t endsecno; 106 u_int64_t slicerel_secno; 107 struct diskslice *sp; 108 u_int32_t part; 109 u_int32_t slice; 110 int shift; 111 int mask; 112 113 slice = dkslice(dev); 114 part = dkpart(dev); 115 116 if (bio->bio_offset < 0) { 117 kprintf("dscheck(%s): negative bio_offset %lld\n", 118 devtoname(dev), (long long)bio->bio_offset); 119 goto bad; 120 } 121 if (slice >= ssp->dss_nslices) { 122 kprintf("dscheck(%s): slice too large %d/%d\n", 123 devtoname(dev), slice, ssp->dss_nslices); 124 goto bad; 125 } 126 sp = &ssp->dss_slices[slice]; 127 /* 128 * Calculate secno and nsec 129 */ 130 if (ssp->dss_secmult == 1) { 131 shift = DEV_BSHIFT; 132 goto doshift; 133 } else if (ssp->dss_secshift != -1) { 134 shift = DEV_BSHIFT + ssp->dss_secshift; 135 doshift: 136 mask = (1 << shift) - 1; 137 if ((int)bp->b_bcount & mask) 138 goto bad_bcount; 139 if ((int)bio->bio_offset & mask) 140 goto bad_blkno; 141 secno = bio->bio_offset >> shift; 142 nsec = bp->b_bcount >> shift; 143 } else { 144 if (bp->b_bcount % ssp->dss_secsize) 145 goto bad_bcount; 146 if (bio->bio_offset % ssp->dss_secsize) 147 goto bad_blkno; 148 secno = bio->bio_offset / ssp->dss_secsize; 149 nsec = bp->b_bcount / ssp->dss_secsize; 150 } 151 152 /* 153 * Calculate slice-relative sector number end slice-relative 154 * limit. 155 */ 156 if (slice == WHOLE_DISK_SLICE) { 157 /* 158 * Labels have not been allowed on whole-disks for a while. 159 * This really puts the nail in the coffin. 160 * 161 * Accesses to the WHOLE_DISK_SLICE do not use a disklabel 162 * and partition numbers are special-cased. Currently numbers 163 * less then 128 are not allowed. Partition numbers >= 128 164 * are encoded in the high 8 bits of the 64 bit buffer offset 165 * and are fed directly through to the device with no 166 * further interpretation. In particular, no sector 167 * translation interpretation should occur because the 168 * sector size for the special raw access may not be the 169 * same as the nominal sector size for the device. 170 */ 171 lp.opaque = NULL; 172 if (part < 128) { 173 kprintf("dscheck(%s): illegal partition number (%d) " 174 "for WHOLE_DISK_SLICE access\n", 175 devtoname(dev), part); 176 goto bad; 177 } else if (part != WHOLE_SLICE_PART) { 178 nbio = push_bio(bio); 179 nbio->bio_offset = bio->bio_offset | 180 (u_int64_t)part << 56; 181 return(nbio); 182 } else { 183 /* 184 * If writing to the raw disk request a 185 * reprobe on the last close. 186 */ 187 if (bp->b_cmd == BUF_CMD_WRITE) 188 sp->ds_flags |= DSF_REPROBE; 189 } 190 191 /* 192 * sp->ds_size is for the whole disk in the WHOLE_DISK_SLICE, 193 * there are no reserved areas. 194 */ 195 endsecno = sp->ds_size; 196 slicerel_secno = secno; 197 } else if (part == WHOLE_SLICE_PART) { 198 /* 199 * NOTE! opens on a whole-slice partition will not attempt 200 * to read a disklabel in, so there may not be an in-core 201 * disklabel even if there is one on the disk. 202 */ 203 endsecno = sp->ds_size; 204 slicerel_secno = secno; 205 } else if ((lp = sp->ds_label).opaque != NULL) { 206 /* 207 * A label is present, extract the partition. Snooping of 208 * the disklabel is not supported even if accessible. Of 209 * course, the reserved area is still write protected. 210 */ 211 ops = sp->ds_ops; 212 if (ops->op_getpartbounds(ssp, lp, part, 213 &slicerel_secno, &endsecno)) { 214 kprintf("dscheck(%s): partition %d out of bounds\n", 215 devtoname(dev), part); 216 goto bad; 217 } 218 slicerel_secno += secno; 219 } else { 220 /* 221 * Attempt to access partition when no disklabel present 222 */ 223 kprintf("dscheck(%s): attempt to access non-existent partition\n", 224 devtoname(dev)); 225 goto bad; 226 } 227 228 /* 229 * Disallow writes to reserved areas unless ds_wlabel allows it. 230 * If the reserved area is written to request a reprobe of the 231 * disklabel when the slice is closed. 232 */ 233 if (slicerel_secno < sp->ds_reserved && nsec && 234 bp->b_cmd == BUF_CMD_WRITE) { 235 if (sp->ds_wlabel == 0) { 236 bp->b_error = EROFS; 237 goto error; 238 } 239 sp->ds_flags |= DSF_REPROBE; 240 } 241 242 /* 243 * If we get here, bio_offset must be on a block boundary and 244 * the sector size must be a power of 2. 245 */ 246 if ((bio->bio_offset & (ssp->dss_secsize - 1)) || 247 (ssp->dss_secsize ^ (ssp->dss_secsize - 1)) != 248 ((ssp->dss_secsize << 1) - 1)) { 249 kprintf("%s: invalid BIO offset, not sector aligned or" 250 " invalid sector size (not power of 2) %08llx %d\n", 251 devtoname(dev), (long long)bio->bio_offset, 252 ssp->dss_secsize); 253 goto bad; 254 } 255 256 /* 257 * EOF handling 258 */ 259 if (secno + nsec > endsecno) { 260 /* 261 * Return an error if beyond the end of the disk, or 262 * if B_BNOCLIP is set. Tell the system that we do not 263 * need to keep the buffer around. 264 */ 265 if (secno > endsecno || (bp->b_flags & B_BNOCLIP)) 266 goto bad; 267 268 /* 269 * If exactly at end of disk, return an EOF. Throw away 270 * the buffer contents, if any, by setting B_INVAL. 271 */ 272 if (secno == endsecno) { 273 bp->b_resid = bp->b_bcount; 274 bp->b_flags |= B_INVAL; 275 goto done; 276 } 277 278 /* 279 * Else truncate 280 */ 281 nsec = endsecno - secno; 282 bp->b_bcount = nsec * ssp->dss_secsize; 283 } 284 285 nbio = push_bio(bio); 286 nbio->bio_offset = (off_t)(sp->ds_offset + slicerel_secno) * 287 ssp->dss_secsize; 288 return (nbio); 289 290 bad_bcount: 291 kprintf( 292 "dscheck(%s): b_bcount %d is not on a sector boundary (ssize %d)\n", 293 devtoname(dev), bp->b_bcount, ssp->dss_secsize); 294 goto bad; 295 296 bad_blkno: 297 kprintf( 298 "dscheck(%s): bio_offset %lld is not on a sector boundary (ssize %d)\n", 299 devtoname(dev), (long long)bio->bio_offset, ssp->dss_secsize); 300 bad: 301 bp->b_error = EINVAL; 302 /* fall through */ 303 error: 304 /* 305 * Terminate the I/O with a ranging error. Since the buffer is 306 * either illegal or beyond the file EOF, mark it B_INVAL as well. 307 */ 308 bp->b_resid = bp->b_bcount; 309 bp->b_flags |= B_ERROR | B_INVAL; 310 done: 311 /* 312 * Caller must biodone() the originally passed bio if NULL is 313 * returned. 314 */ 315 return (NULL); 316 } 317 318 /* 319 * dsclose() - close a cooked disk slice. 320 * 321 * WARNING! The passed diskslices and related diskslice structures may 322 * be invalidated or replaced by this function, callers must 323 * reload from the disk structure for continued access. 324 */ 325 void 326 dsclose(cdev_t dev, int mode, struct diskslices *ssp) 327 { 328 u_int32_t part; 329 u_int32_t slice; 330 struct diskslice *sp; 331 332 slice = dkslice(dev); 333 part = dkpart(dev); 334 if (slice < ssp->dss_nslices) { 335 sp = &ssp->dss_slices[slice]; 336 dsclrmask(sp, part); 337 if (sp->ds_flags & DSF_REPROBE) { 338 sp->ds_flags &= ~DSF_REPROBE; 339 if (slice == WHOLE_DISK_SLICE) { 340 disk_msg_send_sync(DISK_DISK_REPROBE, 341 dev->si_disk, NULL); 342 devfs_config(); 343 } else { 344 disk_msg_send_sync(DISK_SLICE_REPROBE, 345 dev->si_disk, sp); 346 devfs_config(); 347 } 348 /* ssp and sp may both be invalid after reprobe */ 349 } 350 } 351 } 352 353 void 354 dsgone(struct diskslices **sspp) 355 { 356 int slice; 357 struct diskslice *sp; 358 struct diskslices *ssp; 359 360 kprintf("dsgone is called... fear!\n"); 361 362 for (slice = 0, ssp = *sspp; slice < ssp->dss_nslices; slice++) { 363 sp = &ssp->dss_slices[slice]; 364 free_ds_label(ssp, slice); 365 } 366 kfree(ssp, M_DEVBUF); 367 *sspp = NULL; 368 } 369 370 /* 371 * For the "write" commands (DIOCSDINFO and DIOCWDINFO), this 372 * is subject to the same restriction as dsopen(). 373 */ 374 int 375 dsioctl(cdev_t dev, u_long cmd, caddr_t data, int flags, 376 struct diskslices **sspp, struct disk_info *info) 377 { 378 int error; 379 disklabel_t lp; 380 disklabel_t lptmp; 381 disklabel_ops_t ops; 382 int old_wlabel; 383 u_int32_t openmask[DKMAXPARTITIONS/(sizeof(u_int32_t)*8)]; 384 int part; 385 int slice; 386 struct diskslice *sp; 387 struct diskslices *ssp; 388 389 slice = dkslice(dev); 390 part = dkpart(dev); 391 ssp = *sspp; 392 if (slice >= ssp->dss_nslices) 393 return (EINVAL); 394 sp = &ssp->dss_slices[slice]; 395 lp = sp->ds_label; 396 ops = sp->ds_ops; /* may be NULL if no label */ 397 398 switch (cmd) { 399 case DIOCGDVIRGIN32: 400 ops = &disklabel32_ops; 401 /* fall through */ 402 case DIOCGDVIRGIN64: 403 if (cmd != DIOCGDVIRGIN32) 404 ops = &disklabel64_ops; 405 /* 406 * You can only retrieve a virgin disklabel on the whole 407 * disk slice or whole-slice partition. 408 */ 409 if (slice != WHOLE_DISK_SLICE && 410 part != WHOLE_SLICE_PART) { 411 return(EINVAL); 412 } 413 414 lp.opaque = data; 415 ops->op_makevirginlabel(lp, ssp, sp, info); 416 return (0); 417 418 case DIOCGDINFO32: 419 case DIOCGDINFO64: 420 /* 421 * You can only retrieve a disklabel on the whole 422 * slice partition. 423 * 424 * We do not support labels directly on whole-disks 425 * any more (that is, disks without slices), unless the 426 * device driver has asked for a compatible label (e.g. 427 * for a CD) to allow booting off of storage that is 428 * otherwise unlabeled. 429 */ 430 error = 0; 431 if (part != WHOLE_SLICE_PART) 432 return(EINVAL); 433 if (slice == WHOLE_DISK_SLICE && 434 (info->d_dsflags & DSO_COMPATLABEL) == 0) { 435 return (ENODEV); 436 } 437 if (sp->ds_label.opaque == NULL) { 438 error = dsreadandsetlabel(dev, info->d_dsflags, 439 ssp, sp, info); 440 ops = sp->ds_ops; /* may be NULL */ 441 } 442 443 /* 444 * The type of label we found must match the type of 445 * label requested. 446 */ 447 if (error == 0 && IOCPARM_LEN(cmd) != ops->labelsize) 448 error = ENOATTR; 449 if (error == 0) 450 bcopy(sp->ds_label.opaque, data, ops->labelsize); 451 return (error); 452 453 case DIOCGPART: 454 { 455 struct partinfo *dpart = (void *)data; 456 457 /* 458 * The disk management layer may not have read the 459 * disklabel yet because simply opening a slice no 460 * longer 'probes' the disk that way. Be sure we 461 * have tried. 462 * 463 * We ignore any error. 464 */ 465 if (sp->ds_label.opaque == NULL && 466 part == WHOLE_SLICE_PART && 467 slice != WHOLE_DISK_SLICE) { 468 dsreadandsetlabel(dev, info->d_dsflags, 469 ssp, sp, info); 470 ops = sp->ds_ops; /* may be NULL */ 471 } 472 473 bzero(dpart, sizeof(*dpart)); 474 dpart->media_offset = (u_int64_t)sp->ds_offset * 475 info->d_media_blksize; 476 dpart->media_size = (u_int64_t)sp->ds_size * 477 info->d_media_blksize; 478 dpart->media_blocks = sp->ds_size; 479 dpart->media_blksize = info->d_media_blksize; 480 dpart->reserved_blocks= sp->ds_reserved; 481 dpart->fstype_uuid = sp->ds_type_uuid; 482 dpart->storage_uuid = sp->ds_stor_uuid; 483 484 if (slice != WHOLE_DISK_SLICE && 485 part != WHOLE_SLICE_PART) { 486 u_int64_t start; 487 u_int64_t blocks; 488 if (lp.opaque == NULL) 489 return(EINVAL); 490 if (ops->op_getpartbounds(ssp, lp, part, 491 &start, &blocks)) { 492 return(EINVAL); 493 } 494 ops->op_loadpartinfo(lp, part, dpart); 495 dpart->media_offset += start * 496 info->d_media_blksize; 497 dpart->media_size = blocks * 498 info->d_media_blksize; 499 dpart->media_blocks = blocks; 500 501 /* 502 * partition starting sector (p_offset) 503 * requires slice's reserved areas to be 504 * adjusted. 505 */ 506 if (dpart->reserved_blocks > start) 507 dpart->reserved_blocks -= start; 508 else 509 dpart->reserved_blocks = 0; 510 } 511 512 /* 513 * Load remaining fields from the info structure 514 */ 515 dpart->d_nheads = info->d_nheads; 516 dpart->d_ncylinders = info->d_ncylinders; 517 dpart->d_secpertrack = info->d_secpertrack; 518 dpart->d_secpercyl = info->d_secpercyl; 519 } 520 return (0); 521 522 case DIOCGSLICEINFO: 523 bcopy(ssp, data, (char *)&ssp->dss_slices[ssp->dss_nslices] - 524 (char *)ssp); 525 return (0); 526 527 case DIOCSDINFO32: 528 ops = &disklabel32_ops; 529 /* fall through */ 530 case DIOCSDINFO64: 531 if (cmd != DIOCSDINFO32) 532 ops = &disklabel64_ops; 533 /* 534 * You can write a disklabel on the whole disk slice or 535 * whole-slice partition. 536 */ 537 if (slice != WHOLE_DISK_SLICE && 538 part != WHOLE_SLICE_PART) { 539 return(EINVAL); 540 } 541 542 /* 543 * We no longer support writing disklabels directly to media 544 * without there being a slice. Keep this as a separate 545 * conditional. 546 */ 547 if (slice == WHOLE_DISK_SLICE) 548 return (ENODEV); 549 if (!(flags & FWRITE)) 550 return (EBADF); 551 552 /* 553 * If an existing label is present it must be the same 554 * type as the label being passed by the ioctl. 555 */ 556 if (sp->ds_label.opaque && sp->ds_ops != ops) 557 return (ENOATTR); 558 559 /* 560 * Create a temporary copy of the existing label 561 * (if present) so setdisklabel can compare it against 562 * the new label. 563 */ 564 lp.opaque = kmalloc(ops->labelsize, M_DEVBUF, M_WAITOK); 565 if (sp->ds_label.opaque == NULL) 566 bzero(lp.opaque, ops->labelsize); 567 else 568 bcopy(sp->ds_label.opaque, lp.opaque, ops->labelsize); 569 if (sp->ds_label.opaque == NULL) { 570 bzero(openmask, sizeof(openmask)); 571 } else { 572 bcopy(sp->ds_openmask, openmask, sizeof(openmask)); 573 } 574 lptmp.opaque = data; 575 error = ops->op_setdisklabel(lp, lptmp, ssp, sp, openmask); 576 disk_msg_send_sync(DISK_SLICE_REPROBE, dev->si_disk, sp); 577 devfs_config(); 578 if (error != 0) { 579 kfree(lp.opaque, M_DEVBUF); 580 return (error); 581 } 582 free_ds_label(ssp, slice); 583 set_ds_label(ssp, slice, lp, ops); 584 return (0); 585 586 case DIOCSYNCSLICEINFO: 587 /* 588 * This ioctl can only be done on the whole disk 589 */ 590 if (slice != WHOLE_DISK_SLICE || part != WHOLE_SLICE_PART) 591 return (EINVAL); 592 593 if (*(int *)data == 0) { 594 for (slice = 0; slice < ssp->dss_nslices; slice++) { 595 struct diskslice *ds = &ssp->dss_slices[slice]; 596 597 switch(dscountmask(ds)) { 598 case 0: 599 break; 600 case 1: 601 if (slice != WHOLE_DISK_SLICE) 602 return (EBUSY); 603 if (!dschkmask(ds, RAW_PART)) 604 return (EBUSY); 605 break; 606 default: 607 return (EBUSY); 608 } 609 } 610 } 611 612 disk_msg_send_sync(DISK_DISK_REPROBE, dev->si_disk, NULL); 613 devfs_config(); 614 return 0; 615 616 case DIOCWDINFO32: 617 case DIOCWDINFO64: 618 error = dsioctl(dev, ((cmd == DIOCWDINFO32) ? 619 DIOCSDINFO32 : DIOCSDINFO64), 620 data, flags, &ssp, info); 621 if (error == 0 && sp->ds_label.opaque == NULL) 622 error = EINVAL; 623 if (part != WHOLE_SLICE_PART) 624 error = EINVAL; 625 if (error != 0) 626 return (error); 627 628 /* 629 * Allow the reserved area to be written, reload ops 630 * because the DIOCSDINFO op above may have installed 631 * a new label type. 632 */ 633 ops = sp->ds_ops; 634 old_wlabel = sp->ds_wlabel; 635 set_ds_wlabel(ssp, slice, TRUE); 636 error = ops->op_writedisklabel(dev, ssp, sp, sp->ds_label); 637 disk_msg_send_sync(DISK_SLICE_REPROBE, dev->si_disk, sp); 638 devfs_config(); 639 set_ds_wlabel(ssp, slice, old_wlabel); 640 /* XXX should invalidate in-core label if write failed. */ 641 return (error); 642 643 case DIOCWLABEL: 644 if (slice == WHOLE_DISK_SLICE) 645 return (ENODEV); 646 if (!(flags & FWRITE)) 647 return (EBADF); 648 set_ds_wlabel(ssp, slice, *(int *)data != 0); 649 return (0); 650 651 default: 652 return (ENOIOCTL); 653 } 654 } 655 656 int 657 dsisopen(struct diskslices *ssp) 658 { 659 int slice; 660 661 if (ssp == NULL) 662 return (0); 663 for (slice = 0; slice < ssp->dss_nslices; slice++) { 664 if (dscountmask(&ssp->dss_slices[slice])) 665 return (1); 666 } 667 return (0); 668 } 669 670 /* 671 * Allocate a slices "struct" and initialize it to contain only an empty 672 * compatibility slice (pointing to itself), a whole disk slice (covering 673 * the disk as described by the label), and (nslices - BASE_SLICES) empty 674 * slices beginning at BASE_SLICE. 675 * 676 * Note that the compatibility slice is no longer really a compatibility 677 * slice. It is slice 0 if a GPT label is present, and the dangerously 678 * dedicated slice if no slice table otherwise exists. Else it is 0-sized. 679 */ 680 struct diskslices * 681 dsmakeslicestruct(int nslices, struct disk_info *info) 682 { 683 struct diskslice *sp; 684 struct diskslices *ssp; 685 686 ssp = kmalloc(offsetof(struct diskslices, dss_slices) + 687 nslices * sizeof *sp, M_DEVBUF, M_WAITOK); 688 ssp->dss_first_bsd_slice = COMPATIBILITY_SLICE; 689 ssp->dss_nslices = nslices; 690 ssp->dss_oflags = 0; 691 692 /* 693 * Figure out if we can use shifts or whether we have to 694 * use mod/multply to translate byte offsets into sector numbers. 695 */ 696 if ((info->d_media_blksize ^ (info->d_media_blksize - 1)) == 697 (info->d_media_blksize << 1) - 1) { 698 ssp->dss_secmult = info->d_media_blksize / DEV_BSIZE; 699 if (ssp->dss_secmult & (ssp->dss_secmult - 1)) 700 ssp->dss_secshift = -1; 701 else 702 ssp->dss_secshift = ffs(ssp->dss_secmult) - 1; 703 } else { 704 ssp->dss_secmult = 0; 705 ssp->dss_secshift = -1; 706 } 707 ssp->dss_secsize = info->d_media_blksize; 708 sp = &ssp->dss_slices[0]; 709 bzero(sp, nslices * sizeof *sp); 710 sp[WHOLE_DISK_SLICE].ds_size = info->d_media_blocks; 711 return (ssp); 712 } 713 714 char * 715 dsname(cdev_t dev, int unit, int slice, int part, char *partname) 716 { 717 return dev->si_name; 718 } 719 720 /* 721 * This should only be called when the unit is inactive and the strategy 722 * routine should not allow it to become active unless we call it. Our 723 * strategy routine must be special to allow activity. 724 */ 725 int 726 dsopen(cdev_t dev, int mode, u_int flags, 727 struct diskslices **sspp, struct disk_info *info) 728 { 729 struct diskslice *sp; 730 struct diskslices *ssp; 731 int slice; 732 int part; 733 734 ssp = *sspp; 735 dev->si_bsize_phys = info->d_media_blksize; 736 slice = dkslice(dev); 737 part = dkpart(dev); 738 sp = &ssp->dss_slices[slice]; 739 dssetmask(sp, part); 740 741 return 0; 742 } 743 744 /* 745 * Attempt to read the disklabel. If successful, store it in sp->ds_label. 746 * 747 * If we cannot read the disklabel and DSO_COMPATLABEL is set, we construct 748 * a fake label covering the whole disk. 749 */ 750 static 751 int 752 dsreadandsetlabel(cdev_t dev, u_int flags, 753 struct diskslices *ssp, struct diskslice *sp, 754 struct disk_info *info) 755 { 756 disklabel_t lp; 757 disklabel_ops_t ops; 758 const char *msg; 759 const char *sname; 760 char partname[2]; 761 int slice = dkslice(dev); 762 763 /* 764 * Probe the disklabel 765 */ 766 lp.opaque = NULL; 767 sname = dsname(dev, dkunit(dev), slice, WHOLE_SLICE_PART, partname); 768 ops = &disklabel32_ops; 769 msg = ops->op_readdisklabel(dev, sp, &lp, info); 770 if (msg && strcmp(msg, "no disk label") == 0) { 771 ops = &disklabel64_ops; 772 msg = disklabel64_ops.op_readdisklabel(dev, sp, &lp, info); 773 } 774 775 /* 776 * If we failed and COMPATLABEL is set, create a dummy disklabel. 777 */ 778 if (msg != NULL && (flags & DSO_COMPATLABEL)) { 779 msg = NULL; 780 if (sp->ds_size >= 0x100000000ULL) 781 ops = &disklabel64_ops; 782 else 783 ops = &disklabel32_ops; 784 lp = ops->op_clone_label(info, sp); 785 } 786 if (msg != NULL) { 787 if (sp->ds_type == DOSPTYP_386BSD /* XXX */) 788 log(LOG_WARNING, "%s: cannot find label (%s)\n", 789 sname, msg); 790 if (lp.opaque) 791 kfree(lp.opaque, M_DEVBUF); 792 } else { 793 set_ds_label(ssp, slice, lp, ops); 794 set_ds_wlabel(ssp, slice, FALSE); 795 } 796 return (msg ? EINVAL : 0); 797 } 798 799 int64_t 800 dssize(cdev_t dev, struct diskslices **sspp) 801 { 802 disklabel_t lp; 803 disklabel_ops_t ops; 804 int part; 805 int slice; 806 struct diskslices *ssp; 807 u_int64_t start; 808 u_int64_t blocks; 809 810 slice = dkslice(dev); 811 part = dkpart(dev); 812 ssp = *sspp; 813 if (ssp == NULL || slice >= ssp->dss_nslices 814 || !dschkmask(&ssp->dss_slices[slice], part)) { 815 if (dev_dopen(dev, FREAD, S_IFCHR, proc0.p_ucred) != 0) 816 return (-1); 817 dev_dclose(dev, FREAD, S_IFCHR); 818 ssp = *sspp; 819 } 820 lp = ssp->dss_slices[slice].ds_label; 821 if (lp.opaque == NULL) 822 return (-1); 823 ops = ssp->dss_slices[slice].ds_ops; 824 if (ops->op_getpartbounds(ssp, lp, part, &start, &blocks)) 825 return (-1); 826 return ((int64_t)blocks); 827 } 828 829 static void 830 free_ds_label(struct diskslices *ssp, int slice) 831 { 832 struct diskslice *sp; 833 disklabel_t lp; 834 835 sp = &ssp->dss_slices[slice]; 836 lp = sp->ds_label; 837 if (lp.opaque != NULL) { 838 kfree(lp.opaque, M_DEVBUF); 839 lp.opaque = NULL; 840 set_ds_label(ssp, slice, lp, NULL); 841 } 842 } 843 844 static void 845 set_ds_label(struct diskslices *ssp, int slice, 846 disklabel_t lp, disklabel_ops_t ops) 847 { 848 struct diskslice *sp = &ssp->dss_slices[slice]; 849 850 sp->ds_label = lp; 851 sp->ds_ops = ops; 852 if (lp.opaque && slice != WHOLE_DISK_SLICE) 853 ops->op_adjust_label_reserved(ssp, slice, sp); 854 else 855 sp->ds_reserved = 0; 856 } 857 858 static void 859 set_ds_wlabel(struct diskslices *ssp, int slice, int wlabel) 860 { 861 ssp->dss_slices[slice].ds_wlabel = wlabel; 862 } 863 864