1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #pragma ident "%Z%%M% %I% %E% SMI" 27 28 #include <sys/zfs_context.h> 29 #include <sys/spa.h> 30 #include <sys/refcount.h> 31 #include <sys/vdev_disk.h> 32 #include <sys/vdev_impl.h> 33 #include <sys/fs/zfs.h> 34 #include <sys/zio.h> 35 #include <sys/sunldi.h> 36 37 /* 38 * Virtual device vector for disks. 39 */ 40 41 extern ldi_ident_t zfs_li; 42 43 typedef struct vdev_disk_buf { 44 buf_t vdb_buf; 45 zio_t *vdb_io; 46 } vdev_disk_buf_t; 47 48 static int 49 vdev_disk_open_common(vdev_t *vd) 50 { 51 vdev_disk_t *dvd; 52 dev_t dev; 53 int error; 54 55 /* 56 * We must have a pathname, and it must be absolute. 57 */ 58 if (vd->vdev_path == NULL || vd->vdev_path[0] != '/') { 59 vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL; 60 return (EINVAL); 61 } 62 63 dvd = vd->vdev_tsd = kmem_zalloc(sizeof (vdev_disk_t), KM_SLEEP); 64 65 /* 66 * When opening a disk device, we want to preserve the user's original 67 * intent. We always want to open the device by the path the user gave 68 * us, even if it is one of multiple paths to the save device. But we 69 * also want to be able to survive disks being removed/recabled. 70 * Therefore the sequence of opening devices is: 71 * 72 * 1. Try opening the device by path. For legacy pools without the 73 * 'whole_disk' property, attempt to fix the path by appending 's0'. 74 * 75 * 2. If the devid of the device matches the stored value, return 76 * success. 77 * 78 * 3. Otherwise, the device may have moved. Try opening the device 79 * by the devid instead. 80 * 81 */ 82 if (vd->vdev_devid != NULL) { 83 if (ddi_devid_str_decode(vd->vdev_devid, &dvd->vd_devid, 84 &dvd->vd_minor) != 0) { 85 vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL; 86 return (EINVAL); 87 } 88 } 89 90 error = EINVAL; /* presume failure */ 91 92 if (vd->vdev_path != NULL) { 93 ddi_devid_t devid; 94 95 if (vd->vdev_wholedisk == -1ULL) { 96 size_t len = strlen(vd->vdev_path) + 3; 97 char *buf = kmem_alloc(len, KM_SLEEP); 98 ldi_handle_t lh; 99 100 (void) snprintf(buf, len, "%ss0", vd->vdev_path); 101 102 if (ldi_open_by_name(buf, spa_mode, kcred, 103 &lh, zfs_li) == 0) { 104 spa_strfree(vd->vdev_path); 105 vd->vdev_path = buf; 106 vd->vdev_wholedisk = 1ULL; 107 (void) ldi_close(lh, spa_mode, kcred); 108 } else { 109 kmem_free(buf, len); 110 } 111 } 112 113 error = ldi_open_by_name(vd->vdev_path, spa_mode, kcred, 114 &dvd->vd_lh, zfs_li); 115 116 /* 117 * Compare the devid to the stored value. 118 */ 119 if (error == 0 && vd->vdev_devid != NULL && 120 ldi_get_devid(dvd->vd_lh, &devid) == 0) { 121 if (ddi_devid_compare(devid, dvd->vd_devid) != 0) { 122 error = EINVAL; 123 (void) ldi_close(dvd->vd_lh, spa_mode, kcred); 124 dvd->vd_lh = NULL; 125 } 126 ddi_devid_free(devid); 127 } 128 129 /* 130 * If we succeeded in opening the device, but 'vdev_wholedisk' 131 * is not yet set, then this must be a slice. 132 */ 133 if (error == 0 && vd->vdev_wholedisk == -1ULL) 134 vd->vdev_wholedisk = 0; 135 } 136 137 /* 138 * If we were unable to open by path, or the devid check fails, open by 139 * devid instead. 140 */ 141 if (error != 0 && vd->vdev_devid != NULL) 142 error = ldi_open_by_devid(dvd->vd_devid, dvd->vd_minor, 143 spa_mode, kcred, &dvd->vd_lh, zfs_li); 144 145 /* 146 * If all else fails, then try opening by physical path (if available) 147 * or the logical path (if we failed due to the devid check). While not 148 * as reliable as the devid, this will give us something, and the higher 149 * level vdev validation will prevent us from opening the wrong device. 150 */ 151 if (error) { 152 if (vd->vdev_physpath != NULL && 153 (dev = ddi_pathname_to_dev_t(vd->vdev_physpath)) != ENODEV) 154 error = ldi_open_by_dev(&dev, OTYP_BLK, spa_mode, 155 kcred, &dvd->vd_lh, zfs_li); 156 157 /* 158 * Note that we don't support the legacy auto-wholedisk support 159 * as above. This hasn't been used in a very long time and we 160 * don't need to propagate its oddities to this edge condition. 161 */ 162 if (error && vd->vdev_path != NULL) 163 error = ldi_open_by_name(vd->vdev_path, spa_mode, kcred, 164 &dvd->vd_lh, zfs_li); 165 } 166 167 if (error) 168 vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED; 169 170 return (error); 171 } 172 173 static int 174 vdev_disk_open(vdev_t *vd, uint64_t *psize, uint64_t *ashift) 175 { 176 vdev_disk_t *dvd; 177 struct dk_minfo dkm; 178 int error; 179 dev_t dev; 180 int otyp; 181 182 error = vdev_disk_open_common(vd); 183 if (error) 184 return (error); 185 186 dvd = vd->vdev_tsd; 187 /* 188 * Once a device is opened, verify that the physical device path (if 189 * available) is up to date. 190 */ 191 if (ldi_get_dev(dvd->vd_lh, &dev) == 0 && 192 ldi_get_otyp(dvd->vd_lh, &otyp) == 0) { 193 char *physpath, *minorname; 194 195 physpath = kmem_alloc(MAXPATHLEN, KM_SLEEP); 196 minorname = NULL; 197 if (ddi_dev_pathname(dev, otyp, physpath) == 0 && 198 ldi_get_minor_name(dvd->vd_lh, &minorname) == 0 && 199 (vd->vdev_physpath == NULL || 200 strcmp(vd->vdev_physpath, physpath) != 0)) { 201 if (vd->vdev_physpath) 202 spa_strfree(vd->vdev_physpath); 203 (void) strlcat(physpath, ":", MAXPATHLEN); 204 (void) strlcat(physpath, minorname, MAXPATHLEN); 205 vd->vdev_physpath = spa_strdup(physpath); 206 } 207 if (minorname) 208 kmem_free(minorname, strlen(minorname) + 1); 209 kmem_free(physpath, MAXPATHLEN); 210 } 211 212 /* 213 * Determine the actual size of the device. 214 */ 215 if (ldi_get_size(dvd->vd_lh, psize) != 0) { 216 vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED; 217 return (EINVAL); 218 } 219 220 /* 221 * If we own the whole disk, try to enable disk write caching. 222 * We ignore errors because it's OK if we can't do it. 223 */ 224 if (vd->vdev_wholedisk == 1) { 225 int wce = 1; 226 (void) ldi_ioctl(dvd->vd_lh, DKIOCSETWCE, (intptr_t)&wce, 227 FKIOCTL, kcred, NULL); 228 } 229 230 /* 231 * Determine the device's minimum transfer size. 232 * If the ioctl isn't supported, assume DEV_BSIZE. 233 */ 234 if (ldi_ioctl(dvd->vd_lh, DKIOCGMEDIAINFO, (intptr_t)&dkm, 235 FKIOCTL, kcred, NULL) != 0) 236 dkm.dki_lbsize = DEV_BSIZE; 237 238 *ashift = highbit(MAX(dkm.dki_lbsize, SPA_MINBLOCKSIZE)) - 1; 239 240 /* 241 * Clear the nowritecache bit, so that on a vdev_reopen() we will 242 * try again. 243 */ 244 vd->vdev_nowritecache = B_FALSE; 245 246 return (0); 247 } 248 249 static void 250 vdev_disk_close(vdev_t *vd) 251 { 252 vdev_disk_t *dvd = vd->vdev_tsd; 253 254 if (dvd == NULL) 255 return; 256 257 if (dvd->vd_minor != NULL) 258 ddi_devid_str_free(dvd->vd_minor); 259 260 if (dvd->vd_devid != NULL) 261 ddi_devid_free(dvd->vd_devid); 262 263 if (dvd->vd_lh != NULL) 264 (void) ldi_close(dvd->vd_lh, spa_mode, kcred); 265 266 kmem_free(dvd, sizeof (vdev_disk_t)); 267 vd->vdev_tsd = NULL; 268 } 269 270 int 271 vdev_disk_physio(ldi_handle_t vd_lh, caddr_t data, size_t size, 272 uint64_t offset, int flags) 273 { 274 buf_t *bp; 275 int error = 0; 276 277 if (vd_lh == NULL) 278 return (EINVAL); 279 280 ASSERT(flags & B_READ || flags & B_WRITE); 281 282 bp = getrbuf(KM_SLEEP); 283 bp->b_flags = flags | B_BUSY | B_NOCACHE | B_FAILFAST; 284 bp->b_bcount = size; 285 bp->b_un.b_addr = (void *)data; 286 bp->b_lblkno = lbtodb(offset); 287 bp->b_bufsize = size; 288 289 error = ldi_strategy(vd_lh, bp); 290 ASSERT(error == 0); 291 if ((error = biowait(bp)) == 0 && bp->b_resid != 0) 292 error = EIO; 293 freerbuf(bp); 294 295 return (error); 296 } 297 298 static int 299 vdev_disk_probe_io(vdev_t *vd, caddr_t data, size_t size, uint64_t offset, 300 int flags) 301 { 302 int error = 0; 303 vdev_disk_t *dvd = vd->vdev_tsd; 304 305 if (vd == NULL || dvd == NULL || dvd->vd_lh == NULL) 306 return (EINVAL); 307 308 error = vdev_disk_physio(dvd->vd_lh, data, size, offset, flags); 309 310 if (zio_injection_enabled && error == 0) 311 error = zio_handle_device_injection(vd, EIO); 312 313 return (error); 314 } 315 316 /* 317 * Determine if the underlying device is accessible by reading and writing 318 * to a known location. We must be able to do this during syncing context 319 * and thus we cannot set the vdev state directly. 320 */ 321 static int 322 vdev_disk_probe(vdev_t *vd) 323 { 324 uint64_t offset; 325 vdev_t *nvd; 326 int l, error = 0, retries = 0; 327 char *vl_pad; 328 329 if (vd == NULL) 330 return (EINVAL); 331 332 /* Hijack the current vdev */ 333 nvd = vd; 334 335 /* 336 * Pick a random label to rewrite. 337 */ 338 l = spa_get_random(VDEV_LABELS); 339 ASSERT(l < VDEV_LABELS); 340 341 offset = vdev_label_offset(vd->vdev_psize, l, 342 offsetof(vdev_label_t, vl_pad)); 343 344 vl_pad = kmem_alloc(VDEV_SKIP_SIZE, KM_SLEEP); 345 346 /* 347 * Try to read and write to a special location on the 348 * label. We use the existing vdev initially and only 349 * try to create and reopen it if we encounter a failure. 350 */ 351 while ((error = vdev_disk_probe_io(nvd, vl_pad, VDEV_SKIP_SIZE, 352 offset, B_READ)) != 0 && retries == 0) { 353 354 nvd = kmem_zalloc(sizeof (vdev_t), KM_SLEEP); 355 if (vd->vdev_path) 356 nvd->vdev_path = spa_strdup(vd->vdev_path); 357 if (vd->vdev_physpath) 358 nvd->vdev_physpath = spa_strdup(vd->vdev_physpath); 359 if (vd->vdev_devid) 360 nvd->vdev_devid = spa_strdup(vd->vdev_devid); 361 nvd->vdev_wholedisk = vd->vdev_wholedisk; 362 nvd->vdev_guid = vd->vdev_guid; 363 retries++; 364 365 error = vdev_disk_open_common(nvd); 366 if (error) 367 break; 368 } 369 370 if (!error) { 371 error = vdev_disk_probe_io(nvd, vl_pad, VDEV_SKIP_SIZE, 372 offset, B_WRITE); 373 } 374 375 /* Clean up if we allocated a new vdev */ 376 if (retries) { 377 vdev_disk_close(nvd); 378 if (nvd->vdev_path) 379 spa_strfree(nvd->vdev_path); 380 if (nvd->vdev_physpath) 381 spa_strfree(nvd->vdev_physpath); 382 if (nvd->vdev_devid) 383 spa_strfree(nvd->vdev_devid); 384 kmem_free(nvd, sizeof (vdev_t)); 385 } 386 kmem_free(vl_pad, VDEV_SKIP_SIZE); 387 388 /* Reset the failing flag */ 389 if (!error) 390 vd->vdev_is_failing = B_FALSE; 391 392 return (error); 393 } 394 395 static void 396 vdev_disk_io_intr(buf_t *bp) 397 { 398 vdev_disk_buf_t *vdb = (vdev_disk_buf_t *)bp; 399 zio_t *zio = vdb->vdb_io; 400 401 if ((zio->io_error = geterror(bp)) == 0 && bp->b_resid != 0) 402 zio->io_error = EIO; 403 404 kmem_free(vdb, sizeof (vdev_disk_buf_t)); 405 406 zio_interrupt(zio); 407 } 408 409 static void 410 vdev_disk_ioctl_done(void *zio_arg, int error) 411 { 412 zio_t *zio = zio_arg; 413 414 zio->io_error = error; 415 416 zio_interrupt(zio); 417 } 418 419 static int 420 vdev_disk_io_start(zio_t *zio) 421 { 422 vdev_t *vd = zio->io_vd; 423 vdev_disk_t *dvd = vd->vdev_tsd; 424 vdev_disk_buf_t *vdb; 425 buf_t *bp; 426 int flags, error; 427 428 if (zio->io_type == ZIO_TYPE_IOCTL) { 429 zio_vdev_io_bypass(zio); 430 431 /* XXPOLICY */ 432 if (!vdev_readable(vd)) { 433 zio->io_error = ENXIO; 434 return (ZIO_PIPELINE_CONTINUE); 435 } 436 437 switch (zio->io_cmd) { 438 439 case DKIOCFLUSHWRITECACHE: 440 441 if (zfs_nocacheflush) 442 break; 443 444 if (vd->vdev_nowritecache) { 445 zio->io_error = ENOTSUP; 446 break; 447 } 448 449 zio->io_dk_callback.dkc_callback = vdev_disk_ioctl_done; 450 zio->io_dk_callback.dkc_flag = FLUSH_VOLATILE; 451 zio->io_dk_callback.dkc_cookie = zio; 452 453 error = ldi_ioctl(dvd->vd_lh, zio->io_cmd, 454 (uintptr_t)&zio->io_dk_callback, 455 FKIOCTL, kcred, NULL); 456 457 if (error == 0) { 458 /* 459 * The ioctl will be done asychronously, 460 * and will call vdev_disk_ioctl_done() 461 * upon completion. 462 */ 463 return (ZIO_PIPELINE_STOP); 464 } 465 466 if (error == ENOTSUP || error == ENOTTY) { 467 /* 468 * If we get ENOTSUP or ENOTTY, we know that 469 * no future attempts will ever succeed. 470 * In this case we set a persistent bit so 471 * that we don't bother with the ioctl in the 472 * future. 473 */ 474 vd->vdev_nowritecache = B_TRUE; 475 } 476 zio->io_error = error; 477 478 break; 479 480 default: 481 zio->io_error = ENOTSUP; 482 } 483 484 return (ZIO_PIPELINE_CONTINUE); 485 } 486 487 if (zio->io_type == ZIO_TYPE_READ && vdev_cache_read(zio) == 0) 488 return (ZIO_PIPELINE_STOP); 489 490 if ((zio = vdev_queue_io(zio)) == NULL) 491 return (ZIO_PIPELINE_STOP); 492 493 if (zio->io_type == ZIO_TYPE_WRITE) 494 error = vdev_writeable(vd) ? vdev_error_inject(vd, zio) : ENXIO; 495 else 496 error = vdev_readable(vd) ? vdev_error_inject(vd, zio) : ENXIO; 497 error = (vd->vdev_remove_wanted || vd->vdev_is_failing) ? ENXIO : error; 498 499 if (error) { 500 zio->io_error = error; 501 zio_interrupt(zio); 502 return (ZIO_PIPELINE_STOP); 503 } 504 505 flags = (zio->io_type == ZIO_TYPE_READ ? B_READ : B_WRITE); 506 flags |= B_BUSY | B_NOCACHE; 507 if (zio->io_flags & ZIO_FLAG_FAILFAST) 508 flags |= B_FAILFAST; 509 510 vdb = kmem_alloc(sizeof (vdev_disk_buf_t), KM_SLEEP); 511 512 vdb->vdb_io = zio; 513 bp = &vdb->vdb_buf; 514 515 bioinit(bp); 516 bp->b_flags = flags; 517 bp->b_bcount = zio->io_size; 518 bp->b_un.b_addr = zio->io_data; 519 bp->b_lblkno = lbtodb(zio->io_offset); 520 bp->b_bufsize = zio->io_size; 521 bp->b_iodone = (int (*)())vdev_disk_io_intr; 522 523 error = ldi_strategy(dvd->vd_lh, bp); 524 /* ldi_strategy() will return non-zero only on programming errors */ 525 ASSERT(error == 0); 526 527 return (ZIO_PIPELINE_STOP); 528 } 529 530 static int 531 vdev_disk_io_done(zio_t *zio) 532 { 533 vdev_queue_io_done(zio); 534 535 if (zio->io_type == ZIO_TYPE_WRITE) 536 vdev_cache_write(zio); 537 538 if (zio_injection_enabled && zio->io_error == 0) 539 zio->io_error = zio_handle_device_injection(zio->io_vd, EIO); 540 541 /* 542 * If the device returned EIO, then attempt a DKIOCSTATE ioctl to see if 543 * the device has been removed. If this is the case, then we trigger an 544 * asynchronous removal of the device. Otherwise, probe the device and 545 * make sure it's still accessible. 546 */ 547 if (zio->io_error == EIO) { 548 vdev_t *vd = zio->io_vd; 549 vdev_disk_t *dvd = vd->vdev_tsd; 550 int state; 551 552 state = DKIO_NONE; 553 if (dvd && ldi_ioctl(dvd->vd_lh, DKIOCSTATE, (intptr_t)&state, 554 FKIOCTL, kcred, NULL) == 0 && 555 state != DKIO_INSERTED) { 556 vd->vdev_remove_wanted = B_TRUE; 557 spa_async_request(zio->io_spa, SPA_ASYNC_REMOVE); 558 } else if (vdev_probe(vd) != 0) { 559 ASSERT(vd->vdev_ops->vdev_op_leaf); 560 vd->vdev_is_failing = B_TRUE; 561 } 562 } 563 564 return (ZIO_PIPELINE_CONTINUE); 565 } 566 567 vdev_ops_t vdev_disk_ops = { 568 vdev_disk_open, 569 vdev_disk_close, 570 vdev_disk_probe, 571 vdev_default_asize, 572 vdev_disk_io_start, 573 vdev_disk_io_done, 574 NULL, 575 VDEV_TYPE_DISK, /* name of this vdev type */ 576 B_TRUE /* leaf vdev */ 577 }; 578 579 /* 580 * Given the root disk device pathname, read the label from the device, 581 * and construct a configuration nvlist. 582 */ 583 nvlist_t * 584 vdev_disk_read_rootlabel(char *devpath) 585 { 586 nvlist_t *config = NULL; 587 ldi_handle_t vd_lh; 588 vdev_label_t *label; 589 uint64_t s, size; 590 int l; 591 592 /* 593 * Read the device label and build the nvlist. 594 */ 595 if (ldi_open_by_name(devpath, FREAD, kcred, &vd_lh, zfs_li)) 596 return (NULL); 597 598 if (ldi_get_size(vd_lh, &s)) 599 return (NULL); 600 601 size = P2ALIGN_TYPED(s, sizeof (vdev_label_t), uint64_t); 602 label = kmem_alloc(sizeof (vdev_label_t), KM_SLEEP); 603 604 for (l = 0; l < VDEV_LABELS; l++) { 605 uint64_t offset, state, txg = 0; 606 607 /* read vdev label */ 608 offset = vdev_label_offset(size, l, 0); 609 if (vdev_disk_physio(vd_lh, (caddr_t)label, 610 VDEV_SKIP_SIZE + VDEV_BOOT_HEADER_SIZE + 611 VDEV_PHYS_SIZE, offset, B_READ) != 0) 612 continue; 613 614 if (nvlist_unpack(label->vl_vdev_phys.vp_nvlist, 615 sizeof (label->vl_vdev_phys.vp_nvlist), &config, 0) != 0) { 616 config = NULL; 617 continue; 618 } 619 620 if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_STATE, 621 &state) != 0 || state >= POOL_STATE_DESTROYED) { 622 nvlist_free(config); 623 config = NULL; 624 continue; 625 } 626 627 if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_TXG, 628 &txg) != 0 || txg == 0) { 629 nvlist_free(config); 630 config = NULL; 631 continue; 632 } 633 634 break; 635 } 636 637 kmem_free(label, sizeof (vdev_label_t)); 638 return (config); 639 } 640