Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/geom/geom_bsd.c
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1 /*- 2 * Copyright (c) 2002 Poul-Henning Kamp 3 * Copyright (c) 2002 Networks Associates Technology, Inc. 4 * All rights reserved. 5 * 6 * This software was developed for the FreeBSD Project by Poul-Henning Kamp 7 * and NAI Labs, the Security Research Division of Network Associates, Inc. 8 * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the 9 * DARPA CHATS research program. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. The names of the authors may not be used to endorse or promote 20 * products derived from this software without specific prior written 21 * permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * This is the method for dealing with BSD disklabels. It has been 36 * extensively (by my standards at least) commented, in the vain hope that 37 * it will serve as the source in future copy&paste operations. 38 */ 39 40 #include <sys/cdefs.h> 41 __FBSDID("$FreeBSD: releng/5.3/sys/geom/geom_bsd.c 136588 2004-10-16 08:43:07Z cvs2svn $"); 42 43 #include <sys/param.h> 44 #include <sys/endian.h> 45 #include <sys/systm.h> 46 #include <sys/kernel.h> 47 #include <sys/conf.h> 48 #include <sys/bio.h> 49 #include <sys/malloc.h> 50 #include <sys/lock.h> 51 #include <sys/mutex.h> 52 #include <sys/md5.h> 53 #include <sys/errno.h> 54 #include <sys/disklabel.h> 55 #include <geom/geom.h> 56 #include <geom/geom_slice.h> 57 58 #define BSD_CLASS_NAME "BSD" 59 60 #define ALPHA_LABEL_OFFSET 64 61 62 #define LABELSIZE (148 + 16 * MAXPARTITIONS) 63 64 static void g_bsd_hotwrite(void *arg, int flag); 65 /* 66 * Our private data about one instance. All the rest is handled by the 67 * slice code and stored in its softc, so this is just the stuff 68 * specific to BSD disklabels. 69 */ 70 struct g_bsd_softc { 71 off_t labeloffset; 72 off_t mbroffset; 73 off_t rawoffset; 74 struct disklabel ondisk; 75 u_char label[LABELSIZE]; 76 u_char labelsum[16]; 77 }; 78 79 /* 80 * Modify our slicer to match proposed disklabel, if possible. 81 * This is where we make sure we don't do something stupid. 82 */ 83 static int 84 g_bsd_modify(struct g_geom *gp, u_char *label) 85 { 86 int i, error; 87 struct partition *ppp; 88 struct g_slicer *gsp; 89 struct g_consumer *cp; 90 struct g_bsd_softc *ms; 91 u_int secsize, u; 92 off_t rawoffset, o; 93 struct disklabel dl; 94 MD5_CTX md5sum; 95 96 g_topology_assert(); 97 gsp = gp->softc; 98 ms = gsp->softc; 99 100 error = bsd_disklabel_le_dec(label, &dl, MAXPARTITIONS); 101 if (error) { 102 return (error); 103 } 104 105 /* Get dimensions of our device. */ 106 cp = LIST_FIRST(&gp->consumer); 107 secsize = cp->provider->sectorsize; 108 109 /* ... or a smaller sector size. */ 110 if (dl.d_secsize < secsize) { 111 return (EINVAL); 112 } 113 114 /* ... or a non-multiple sector size. */ 115 if (dl.d_secsize % secsize != 0) { 116 return (EINVAL); 117 } 118 119 /* Historical braindamage... */ 120 rawoffset = (off_t)dl.d_partitions[RAW_PART].p_offset * dl.d_secsize; 121 122 for (i = 0; i < dl.d_npartitions; i++) { 123 ppp = &dl.d_partitions[i]; 124 if (ppp->p_size == 0) 125 continue; 126 o = (off_t)ppp->p_offset * dl.d_secsize; 127 128 if (o < rawoffset) 129 rawoffset = 0; 130 } 131 132 if (rawoffset != 0 && (off_t)rawoffset != ms->mbroffset) 133 printf("WARNING: Expected rawoffset %jd, found %jd\n", 134 (intmax_t)ms->mbroffset/dl.d_secsize, 135 (intmax_t)rawoffset/dl.d_secsize); 136 137 /* Don't munge open partitions. */ 138 for (i = 0; i < dl.d_npartitions; i++) { 139 ppp = &dl.d_partitions[i]; 140 141 o = (off_t)ppp->p_offset * dl.d_secsize; 142 if (o == 0) 143 o = rawoffset; 144 error = g_slice_config(gp, i, G_SLICE_CONFIG_CHECK, 145 o - rawoffset, 146 (off_t)ppp->p_size * dl.d_secsize, 147 dl.d_secsize, 148 "%s%c", gp->name, 'a' + i); 149 if (error) 150 return (error); 151 } 152 153 /* Look good, go for it... */ 154 for (u = 0; u < gsp->nslice; u++) { 155 ppp = &dl.d_partitions[u]; 156 o = (off_t)ppp->p_offset * dl.d_secsize; 157 if (o == 0) 158 o = rawoffset; 159 g_slice_config(gp, u, G_SLICE_CONFIG_SET, 160 o - rawoffset, 161 (off_t)ppp->p_size * dl.d_secsize, 162 dl.d_secsize, 163 "%s%c", gp->name, 'a' + u); 164 } 165 166 /* Update our softc */ 167 ms->ondisk = dl; 168 if (label != ms->label) 169 bcopy(label, ms->label, LABELSIZE); 170 ms->rawoffset = rawoffset; 171 172 /* 173 * In order to avoid recursively attaching to the same 174 * on-disk label (it's usually visible through the 'c' 175 * partition) we calculate an MD5 and ask if other BSD's 176 * below us love that label. If they do, we don't. 177 */ 178 MD5Init(&md5sum); 179 MD5Update(&md5sum, ms->label, sizeof(ms->label)); 180 MD5Final(ms->labelsum, &md5sum); 181 182 return (0); 183 } 184 185 /* 186 * This is an internal helper function, called multiple times from the taste 187 * function to try to locate a disklabel on the disk. More civilized formats 188 * will not need this, as there is only one possible place on disk to look 189 * for the magic spot. 190 */ 191 192 static int 193 g_bsd_try(struct g_geom *gp, struct g_slicer *gsp, struct g_consumer *cp, int secsize, struct g_bsd_softc *ms, off_t offset) 194 { 195 int error; 196 u_char *buf; 197 struct disklabel *dl; 198 off_t secoff; 199 200 /* 201 * We need to read entire aligned sectors, and we assume that the 202 * disklabel does not span sectors, so one sector is enough. 203 */ 204 error = 0; 205 secoff = offset % secsize; 206 buf = g_read_data(cp, offset - secoff, secsize, &error); 207 if (buf == NULL || error != 0) 208 return (ENOENT); 209 210 /* Decode into our native format. */ 211 dl = &ms->ondisk; 212 error = bsd_disklabel_le_dec(buf + secoff, dl, MAXPARTITIONS); 213 if (!error) 214 bcopy(buf + secoff, ms->label, LABELSIZE); 215 216 /* Remember to free the buffer g_read_data() gave us. */ 217 g_free(buf); 218 219 ms->labeloffset = offset; 220 return (error); 221 } 222 223 /* 224 * This function writes the current label to disk, possibly updating 225 * the alpha SRM checksum. 226 */ 227 228 static int 229 g_bsd_writelabel(struct g_geom *gp, u_char *bootcode) 230 { 231 off_t secoff; 232 u_int secsize; 233 struct g_consumer *cp; 234 struct g_slicer *gsp; 235 struct g_bsd_softc *ms; 236 u_char *buf; 237 uint64_t sum; 238 int error, i; 239 240 gsp = gp->softc; 241 ms = gsp->softc; 242 cp = LIST_FIRST(&gp->consumer); 243 /* Get sector size, we need it to read data. */ 244 secsize = cp->provider->sectorsize; 245 secoff = ms->labeloffset % secsize; 246 if (bootcode == NULL) { 247 buf = g_read_data(cp, ms->labeloffset - secoff, secsize, &error); 248 if (buf == NULL || error != 0) 249 return (error); 250 bcopy(ms->label, buf + secoff, sizeof(ms->label)); 251 } else { 252 buf = bootcode; 253 bcopy(ms->label, buf + ms->labeloffset, sizeof(ms->label)); 254 } 255 if (ms->labeloffset == ALPHA_LABEL_OFFSET) { 256 sum = 0; 257 for (i = 0; i < 63; i++) 258 sum += le64dec(buf + i * 8); 259 le64enc(buf + 504, sum); 260 } 261 if (bootcode == NULL) { 262 error = g_write_data(cp, ms->labeloffset - secoff, buf, secsize); 263 g_free(buf); 264 } else { 265 error = g_write_data(cp, 0, bootcode, BBSIZE); 266 } 267 return(error); 268 } 269 270 /* 271 * If the user tries to overwrite our disklabel through an open partition 272 * or via a magicwrite config call, we end up here and try to prevent 273 * footshooting as best we can. 274 */ 275 static void 276 g_bsd_hotwrite(void *arg, int flag) 277 { 278 struct bio *bp; 279 struct g_geom *gp; 280 struct g_slicer *gsp; 281 struct g_slice *gsl; 282 struct g_bsd_softc *ms; 283 u_char *p; 284 int error; 285 286 g_topology_assert(); 287 /* 288 * We should never get canceled, because that would amount to a removal 289 * of the geom while there was outstanding I/O requests. 290 */ 291 KASSERT(flag != EV_CANCEL, ("g_bsd_hotwrite cancelled")); 292 bp = arg; 293 gp = bp->bio_to->geom; 294 gsp = gp->softc; 295 ms = gsp->softc; 296 gsl = &gsp->slices[bp->bio_to->index]; 297 p = (u_char*)bp->bio_data + ms->labeloffset 298 - (bp->bio_offset + gsl->offset); 299 error = g_bsd_modify(gp, p); 300 if (error) { 301 g_io_deliver(bp, EPERM); 302 return; 303 } 304 g_slice_finish_hot(bp); 305 } 306 307 /*- 308 * This start routine is only called for non-trivial requests, all the 309 * trivial ones are handled autonomously by the slice code. 310 * For requests we handle here, we must call the g_io_deliver() on the 311 * bio, and return non-zero to indicate to the slice code that we did so. 312 * This code executes in the "DOWN" I/O path, this means: 313 * * No sleeping. 314 * * Don't grab the topology lock. 315 * * Don't call biowait, g_getattr(), g_setattr() or g_read_data() 316 */ 317 static int 318 g_bsd_ioctl(struct g_provider *pp, u_long cmd, void * data, struct thread *td) 319 { 320 struct g_geom *gp; 321 struct g_bsd_softc *ms; 322 struct g_slicer *gsp; 323 u_char *label; 324 int error; 325 326 gp = pp->geom; 327 gsp = gp->softc; 328 ms = gsp->softc; 329 330 switch(cmd) { 331 case DIOCGDINFO: 332 /* Return a copy of the disklabel to userland. */ 333 bsd_disklabel_le_dec(ms->label, data, MAXPARTITIONS); 334 return(0); 335 case DIOCBSDBB: { 336 struct g_consumer *cp; 337 u_char *buf; 338 void *p; 339 int error, i; 340 uint64_t sum; 341 342 /* The disklabel to set is the ioctl argument. */ 343 buf = g_malloc(BBSIZE, M_WAITOK); 344 p = *(void **)data; 345 error = copyin(p, buf, BBSIZE); 346 if (!error) { 347 /* XXX: Rude, but supposedly safe */ 348 DROP_GIANT(); 349 g_topology_lock(); 350 /* Validate and modify our slice instance to match. */ 351 error = g_bsd_modify(gp, buf + ms->labeloffset); 352 if (!error) { 353 cp = LIST_FIRST(&gp->consumer); 354 if (ms->labeloffset == ALPHA_LABEL_OFFSET) { 355 sum = 0; 356 for (i = 0; i < 63; i++) 357 sum += le64dec(buf + i * 8); 358 le64enc(buf + 504, sum); 359 } 360 error = g_write_data(cp, 0, buf, BBSIZE); 361 } 362 g_topology_unlock(); 363 PICKUP_GIANT(); 364 } 365 g_free(buf); 366 return (error); 367 } 368 case DIOCSDINFO: 369 case DIOCWDINFO: { 370 label = g_malloc(LABELSIZE, M_WAITOK); 371 372 /* The disklabel to set is the ioctl argument. */ 373 bsd_disklabel_le_enc(label, data); 374 375 DROP_GIANT(); 376 g_topology_lock(); 377 /* Validate and modify our slice instance to match. */ 378 error = g_bsd_modify(gp, label); 379 if (error == 0 && cmd == DIOCWDINFO) 380 error = g_bsd_writelabel(gp, NULL); 381 g_topology_unlock(); 382 PICKUP_GIANT(); 383 g_free(label); 384 return(error); 385 } 386 default: 387 return (ENOIOCTL); 388 } 389 } 390 391 static int 392 g_bsd_start(struct bio *bp) 393 { 394 struct g_geom *gp; 395 struct g_bsd_softc *ms; 396 struct g_slicer *gsp; 397 398 gp = bp->bio_to->geom; 399 gsp = gp->softc; 400 ms = gsp->softc; 401 if (bp->bio_cmd == BIO_GETATTR) { 402 if (g_handleattr(bp, "BSD::labelsum", ms->labelsum, 403 sizeof(ms->labelsum))) 404 return (1); 405 } 406 return (0); 407 } 408 409 /* 410 * Dump configuration information in XML format. 411 * Notice that the function is called once for the geom and once for each 412 * consumer and provider. We let g_slice_dumpconf() do most of the work. 413 */ 414 static void 415 g_bsd_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp) 416 { 417 struct g_bsd_softc *ms; 418 struct g_slicer *gsp; 419 420 gsp = gp->softc; 421 ms = gsp->softc; 422 g_slice_dumpconf(sb, indent, gp, cp, pp); 423 if (indent != NULL && pp == NULL && cp == NULL) { 424 sbuf_printf(sb, "%s<labeloffset>%jd</labeloffset>\n", 425 indent, (intmax_t)ms->labeloffset); 426 sbuf_printf(sb, "%s<rawoffset>%jd</rawoffset>\n", 427 indent, (intmax_t)ms->rawoffset); 428 sbuf_printf(sb, "%s<mbroffset>%jd</mbroffset>\n", 429 indent, (intmax_t)ms->mbroffset); 430 } else if (pp != NULL) { 431 if (indent == NULL) 432 sbuf_printf(sb, " ty %d", 433 ms->ondisk.d_partitions[pp->index].p_fstype); 434 else 435 sbuf_printf(sb, "%s<type>%d</type>\n", indent, 436 ms->ondisk.d_partitions[pp->index].p_fstype); 437 } 438 } 439 440 /* 441 * The taste function is called from the event-handler, with the topology 442 * lock already held and a provider to examine. The flags are unused. 443 * 444 * If flags == G_TF_NORMAL, the idea is to take a bite of the provider and 445 * if we find valid, consistent magic on it, build a geom on it. 446 * any magic bits which indicate that we should automatically put a BSD 447 * geom on it. 448 * 449 * There may be cases where the operator would like to put a BSD-geom on 450 * providers which do not meet all of the requirements. This can be done 451 * by instead passing the G_TF_INSIST flag, which will override these 452 * checks. 453 * 454 * The final flags value is G_TF_TRANSPARENT, which instructs the method 455 * to put a geom on top of the provider and configure it to be as transparent 456 * as possible. This is not really relevant to the BSD method and therefore 457 * not implemented here. 458 */ 459 460 static struct g_geom * 461 g_bsd_taste(struct g_class *mp, struct g_provider *pp, int flags) 462 { 463 struct g_geom *gp; 464 struct g_consumer *cp; 465 int error, i; 466 struct g_bsd_softc *ms; 467 u_int secsize; 468 struct g_slicer *gsp; 469 u_char hash[16]; 470 MD5_CTX md5sum; 471 472 g_trace(G_T_TOPOLOGY, "bsd_taste(%s,%s)", mp->name, pp->name); 473 g_topology_assert(); 474 475 /* We don't implement transparent inserts. */ 476 if (flags == G_TF_TRANSPARENT) 477 return (NULL); 478 479 /* 480 * BSD labels are a subclass of the general "slicing" topology so 481 * a lot of the work can be done by the common "slice" code. 482 * Create a geom with space for MAXPARTITIONS providers, one consumer 483 * and a softc structure for us. Specify the provider to attach 484 * the consumer to and our "start" routine for special requests. 485 * The provider is opened with mode (1,0,0) so we can do reads 486 * from it. 487 */ 488 gp = g_slice_new(mp, MAXPARTITIONS, pp, &cp, &ms, 489 sizeof(*ms), g_bsd_start); 490 if (gp == NULL) 491 return (NULL); 492 493 /* Get the geom_slicer softc from the geom. */ 494 gsp = gp->softc; 495 496 /* 497 * The do...while loop here allows us to have multiple escapes 498 * using a simple "break". This improves code clarity without 499 * ending up in deep nesting and without using goto or come from. 500 */ 501 do { 502 /* 503 * If the provider is an MBR we will only auto attach 504 * to type 165 slices in the G_TF_NORMAL case. We will 505 * attach to any other type. 506 */ 507 error = g_getattr("MBR::type", cp, &i); 508 if (!error) { 509 if (i != 165 && flags == G_TF_NORMAL) 510 break; 511 error = g_getattr("MBR::offset", cp, &ms->mbroffset); 512 if (error) 513 break; 514 } 515 516 /* Same thing if we are inside a PC98 */ 517 error = g_getattr("PC98::type", cp, &i); 518 if (!error) { 519 if (i != 0xc494 && flags == G_TF_NORMAL) 520 break; 521 error = g_getattr("PC98::offset", cp, &ms->mbroffset); 522 if (error) 523 break; 524 } 525 526 /* Get sector size, we need it to read data. */ 527 secsize = cp->provider->sectorsize; 528 if (secsize < 512) 529 break; 530 531 /* First look for a label at the start of the second sector. */ 532 error = g_bsd_try(gp, gsp, cp, secsize, ms, secsize); 533 534 /* Next, look for alpha labels */ 535 if (error) 536 error = g_bsd_try(gp, gsp, cp, secsize, ms, 537 ALPHA_LABEL_OFFSET); 538 539 /* If we didn't find a label, punt. */ 540 if (error) 541 break; 542 543 /* 544 * In order to avoid recursively attaching to the same 545 * on-disk label (it's usually visible through the 'c' 546 * partition) we calculate an MD5 and ask if other BSD's 547 * below us love that label. If they do, we don't. 548 */ 549 MD5Init(&md5sum); 550 MD5Update(&md5sum, ms->label, sizeof(ms->label)); 551 MD5Final(ms->labelsum, &md5sum); 552 553 error = g_getattr("BSD::labelsum", cp, &hash); 554 if (!error && !bcmp(ms->labelsum, hash, sizeof(hash))) 555 break; 556 557 /* 558 * Process the found disklabel, and modify our "slice" 559 * instance to match it, if possible. 560 */ 561 error = g_bsd_modify(gp, ms->label); 562 } while (0); 563 564 /* Success or failure, we can close our provider now. */ 565 g_access(cp, -1, 0, 0); 566 567 /* If we have configured any providers, return the new geom. */ 568 if (gsp->nprovider > 0) { 569 g_slice_conf_hot(gp, 0, ms->labeloffset, LABELSIZE, 570 G_SLICE_HOT_ALLOW, G_SLICE_HOT_DENY, G_SLICE_HOT_CALL); 571 gsp->hot = g_bsd_hotwrite; 572 return (gp); 573 } 574 /* 575 * ...else push the "self-destruct" button, by spoiling our own 576 * consumer. This triggers a call to g_slice_spoiled which will 577 * dismantle what was setup. 578 */ 579 g_slice_spoiled(cp); 580 return (NULL); 581 } 582 583 struct h0h0 { 584 struct g_geom *gp; 585 struct g_bsd_softc *ms; 586 u_char *label; 587 int error; 588 }; 589 590 static void 591 g_bsd_callconfig(void *arg, int flag) 592 { 593 struct h0h0 *hp; 594 595 hp = arg; 596 hp->error = g_bsd_modify(hp->gp, hp->label); 597 if (!hp->error) 598 hp->error = g_bsd_writelabel(hp->gp, NULL); 599 } 600 601 /* 602 * NB! curthread is user process which GCTL'ed. 603 */ 604 static void 605 g_bsd_config(struct gctl_req *req, struct g_class *mp, char const *verb) 606 { 607 u_char *label; 608 int error; 609 struct h0h0 h0h0; 610 struct g_geom *gp; 611 struct g_slicer *gsp; 612 struct g_consumer *cp; 613 struct g_bsd_softc *ms; 614 615 g_topology_assert(); 616 gp = gctl_get_geom(req, mp, "geom"); 617 if (gp == NULL) 618 return; 619 cp = LIST_FIRST(&gp->consumer); 620 gsp = gp->softc; 621 ms = gsp->softc; 622 if (!strcmp(verb, "read mbroffset")) { 623 gctl_set_param(req, "mbroffset", 624 &ms->mbroffset, sizeof(ms->mbroffset)); 625 return; 626 } else if (!strcmp(verb, "write label")) { 627 label = gctl_get_paraml(req, "label", LABELSIZE); 628 if (label == NULL) 629 return; 630 h0h0.gp = gp; 631 h0h0.ms = gsp->softc; 632 h0h0.label = label; 633 h0h0.error = -1; 634 /* XXX: Does this reference register with our selfdestruct code ? */ 635 error = g_access(cp, 1, 1, 1); 636 if (error) { 637 gctl_error(req, "could not access consumer"); 638 return; 639 } 640 g_bsd_callconfig(&h0h0, 0); 641 error = h0h0.error; 642 g_access(cp, -1, -1, -1); 643 } else if (!strcmp(verb, "write bootcode")) { 644 label = gctl_get_paraml(req, "bootcode", BBSIZE); 645 if (label == NULL) 646 return; 647 /* XXX: Does this reference register with our selfdestruct code ? */ 648 error = g_access(cp, 1, 1, 1); 649 if (error) { 650 gctl_error(req, "could not access consumer"); 651 return; 652 } 653 error = g_bsd_writelabel(gp, label); 654 g_access(cp, -1, -1, -1); 655 } else { 656 gctl_error(req, "Unknown verb parameter"); 657 } 658 659 return; 660 } 661 662 /* Finally, register with GEOM infrastructure. */ 663 static struct g_class g_bsd_class = { 664 .name = BSD_CLASS_NAME, 665 .version = G_VERSION, 666 .taste = g_bsd_taste, 667 .ctlreq = g_bsd_config, 668 .dumpconf = g_bsd_dumpconf, 669 .ioctl = g_bsd_ioctl, 670 }; 671 672 DECLARE_GEOM_CLASS(g_bsd_class, g_bsd);
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