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 2010 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #include <sys/zfs_context.h> 27 #include <sys/spa_impl.h> 28 #include <sys/refcount.h> 29 #include <sys/vdev_disk.h> 30 #include <sys/vdev_impl.h> 31 #include <sys/fs/zfs.h> 32 #include <sys/zio.h> 33 #include <sys/sunldi.h> 34 #include <sys/fm/fs/zfs.h> 35 36 /* 37 * Virtual device vector for disks. 38 */ 39 40 extern ldi_ident_t zfs_li; 41 42 typedef struct vdev_disk_buf { 43 buf_t vdb_buf; 44 zio_t *vdb_io; 45 } vdev_disk_buf_t; 46 47 static void 48 vdev_disk_hold(vdev_t *vd) 49 { 50 ddi_devid_t devid; 51 char *minor; 52 53 ASSERT(spa_config_held(vd->vdev_spa, SCL_STATE, RW_WRITER)); 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 return; 60 61 /* 62 * Only prefetch path and devid info if the device has 63 * never been opened. 64 */ 65 if (vd->vdev_tsd != NULL) 66 return; 67 68 if (vd->vdev_wholedisk == -1ULL) { 69 size_t len = strlen(vd->vdev_path) + 3; 70 char *buf = kmem_alloc(len, KM_SLEEP); 71 72 (void) snprintf(buf, len, "%ss0", vd->vdev_path); 73 74 (void) ldi_vp_from_name(buf, &vd->vdev_name_vp); 75 kmem_free(buf, len); 76 } 77 78 if (vd->vdev_name_vp == NULL) 79 (void) ldi_vp_from_name(vd->vdev_path, &vd->vdev_name_vp); 80 81 if (vd->vdev_devid != NULL && 82 ddi_devid_str_decode(vd->vdev_devid, &devid, &minor) == 0) { 83 (void) ldi_vp_from_devid(devid, minor, &vd->vdev_devid_vp); 84 ddi_devid_str_free(minor); 85 ddi_devid_free(devid); 86 } 87 } 88 89 static void 90 vdev_disk_rele(vdev_t *vd) 91 { 92 ASSERT(spa_config_held(vd->vdev_spa, SCL_STATE, RW_WRITER)); 93 94 if (vd->vdev_name_vp) { 95 VN_RELE_ASYNC(vd->vdev_name_vp, 96 dsl_pool_vnrele_taskq(vd->vdev_spa->spa_dsl_pool)); 97 vd->vdev_name_vp = NULL; 98 } 99 if (vd->vdev_devid_vp) { 100 VN_RELE_ASYNC(vd->vdev_devid_vp, 101 dsl_pool_vnrele_taskq(vd->vdev_spa->spa_dsl_pool)); 102 vd->vdev_devid_vp = NULL; 103 } 104 } 105 106 static int 107 vdev_disk_open(vdev_t *vd, uint64_t *psize, uint64_t *ashift) 108 { 109 spa_t *spa = vd->vdev_spa; 110 vdev_disk_t *dvd; 111 struct dk_minfo dkm; 112 int error; 113 dev_t dev; 114 int otyp; 115 116 /* 117 * We must have a pathname, and it must be absolute. 118 */ 119 if (vd->vdev_path == NULL || vd->vdev_path[0] != '/') { 120 vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL; 121 return (EINVAL); 122 } 123 124 /* 125 * Reopen the device if it's not currently open. Otherwise, 126 * just update the physical size of the device. 127 */ 128 if (vd->vdev_tsd != NULL) { 129 ASSERT(vd->vdev_reopening); 130 dvd = vd->vdev_tsd; 131 goto skip_open; 132 } 133 134 dvd = vd->vdev_tsd = kmem_zalloc(sizeof (vdev_disk_t), KM_SLEEP); 135 136 /* 137 * When opening a disk device, we want to preserve the user's original 138 * intent. We always want to open the device by the path the user gave 139 * us, even if it is one of multiple paths to the save device. But we 140 * also want to be able to survive disks being removed/recabled. 141 * Therefore the sequence of opening devices is: 142 * 143 * 1. Try opening the device by path. For legacy pools without the 144 * 'whole_disk' property, attempt to fix the path by appending 's0'. 145 * 146 * 2. If the devid of the device matches the stored value, return 147 * success. 148 * 149 * 3. Otherwise, the device may have moved. Try opening the device 150 * by the devid instead. 151 */ 152 if (vd->vdev_devid != NULL) { 153 if (ddi_devid_str_decode(vd->vdev_devid, &dvd->vd_devid, 154 &dvd->vd_minor) != 0) { 155 vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL; 156 return (EINVAL); 157 } 158 } 159 160 error = EINVAL; /* presume failure */ 161 162 if (vd->vdev_path != NULL) { 163 ddi_devid_t devid; 164 165 if (vd->vdev_wholedisk == -1ULL) { 166 size_t len = strlen(vd->vdev_path) + 3; 167 char *buf = kmem_alloc(len, KM_SLEEP); 168 ldi_handle_t lh; 169 170 (void) snprintf(buf, len, "%ss0", vd->vdev_path); 171 172 if (ldi_open_by_name(buf, spa_mode(spa), kcred, 173 &lh, zfs_li) == 0) { 174 spa_strfree(vd->vdev_path); 175 vd->vdev_path = buf; 176 vd->vdev_wholedisk = 1ULL; 177 (void) ldi_close(lh, spa_mode(spa), kcred); 178 } else { 179 kmem_free(buf, len); 180 } 181 } 182 183 error = ldi_open_by_name(vd->vdev_path, spa_mode(spa), kcred, 184 &dvd->vd_lh, zfs_li); 185 186 /* 187 * Compare the devid to the stored value. 188 */ 189 if (error == 0 && vd->vdev_devid != NULL && 190 ldi_get_devid(dvd->vd_lh, &devid) == 0) { 191 if (ddi_devid_compare(devid, dvd->vd_devid) != 0) { 192 error = EINVAL; 193 (void) ldi_close(dvd->vd_lh, spa_mode(spa), 194 kcred); 195 dvd->vd_lh = NULL; 196 } 197 ddi_devid_free(devid); 198 } 199 200 /* 201 * If we succeeded in opening the device, but 'vdev_wholedisk' 202 * is not yet set, then this must be a slice. 203 */ 204 if (error == 0 && vd->vdev_wholedisk == -1ULL) 205 vd->vdev_wholedisk = 0; 206 } 207 208 /* 209 * If we were unable to open by path, or the devid check fails, open by 210 * devid instead. 211 */ 212 if (error != 0 && vd->vdev_devid != NULL) 213 error = ldi_open_by_devid(dvd->vd_devid, dvd->vd_minor, 214 spa_mode(spa), kcred, &dvd->vd_lh, zfs_li); 215 216 /* 217 * If all else fails, then try opening by physical path (if available) 218 * or the logical path (if we failed due to the devid check). While not 219 * as reliable as the devid, this will give us something, and the higher 220 * level vdev validation will prevent us from opening the wrong device. 221 */ 222 if (error) { 223 if (vd->vdev_physpath != NULL && 224 (dev = ddi_pathname_to_dev_t(vd->vdev_physpath)) != NODEV) 225 error = ldi_open_by_dev(&dev, OTYP_BLK, spa_mode(spa), 226 kcred, &dvd->vd_lh, zfs_li); 227 228 /* 229 * Note that we don't support the legacy auto-wholedisk support 230 * as above. This hasn't been used in a very long time and we 231 * don't need to propagate its oddities to this edge condition. 232 */ 233 if (error && vd->vdev_path != NULL) 234 error = ldi_open_by_name(vd->vdev_path, spa_mode(spa), 235 kcred, &dvd->vd_lh, zfs_li); 236 } 237 238 if (error) { 239 vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED; 240 return (error); 241 } 242 243 /* 244 * Once a device is opened, verify that the physical device path (if 245 * available) is up to date. 246 */ 247 if (ldi_get_dev(dvd->vd_lh, &dev) == 0 && 248 ldi_get_otyp(dvd->vd_lh, &otyp) == 0) { 249 char *physpath, *minorname; 250 251 physpath = kmem_alloc(MAXPATHLEN, KM_SLEEP); 252 minorname = NULL; 253 if (ddi_dev_pathname(dev, otyp, physpath) == 0 && 254 ldi_get_minor_name(dvd->vd_lh, &minorname) == 0 && 255 (vd->vdev_physpath == NULL || 256 strcmp(vd->vdev_physpath, physpath) != 0)) { 257 if (vd->vdev_physpath) 258 spa_strfree(vd->vdev_physpath); 259 (void) strlcat(physpath, ":", MAXPATHLEN); 260 (void) strlcat(physpath, minorname, MAXPATHLEN); 261 vd->vdev_physpath = spa_strdup(physpath); 262 } 263 if (minorname) 264 kmem_free(minorname, strlen(minorname) + 1); 265 kmem_free(physpath, MAXPATHLEN); 266 } 267 268 skip_open: 269 /* 270 * Determine the actual size of the device. 271 */ 272 if (ldi_get_size(dvd->vd_lh, psize) != 0) { 273 vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED; 274 return (EINVAL); 275 } 276 277 /* 278 * If we own the whole disk, try to enable disk write caching. 279 * We ignore errors because it's OK if we can't do it. 280 */ 281 if (vd->vdev_wholedisk == 1) { 282 int wce = 1; 283 (void) ldi_ioctl(dvd->vd_lh, DKIOCSETWCE, (intptr_t)&wce, 284 FKIOCTL, kcred, NULL); 285 } 286 287 /* 288 * Determine the device's minimum transfer size. 289 * If the ioctl isn't supported, assume DEV_BSIZE. 290 */ 291 if (ldi_ioctl(dvd->vd_lh, DKIOCGMEDIAINFO, (intptr_t)&dkm, 292 FKIOCTL, kcred, NULL) != 0) 293 dkm.dki_lbsize = DEV_BSIZE; 294 295 *ashift = highbit(MAX(dkm.dki_lbsize, SPA_MINBLOCKSIZE)) - 1; 296 297 /* 298 * Clear the nowritecache bit, so that on a vdev_reopen() we will 299 * try again. 300 */ 301 vd->vdev_nowritecache = B_FALSE; 302 303 return (0); 304 } 305 306 static void 307 vdev_disk_close(vdev_t *vd) 308 { 309 vdev_disk_t *dvd = vd->vdev_tsd; 310 311 if (vd->vdev_reopening || dvd == NULL) 312 return; 313 314 if (dvd->vd_minor != NULL) 315 ddi_devid_str_free(dvd->vd_minor); 316 317 if (dvd->vd_devid != NULL) 318 ddi_devid_free(dvd->vd_devid); 319 320 if (dvd->vd_lh != NULL) 321 (void) ldi_close(dvd->vd_lh, spa_mode(vd->vdev_spa), kcred); 322 323 kmem_free(dvd, sizeof (vdev_disk_t)); 324 vd->vdev_tsd = NULL; 325 } 326 327 int 328 vdev_disk_physio(ldi_handle_t vd_lh, caddr_t data, size_t size, 329 uint64_t offset, int flags) 330 { 331 buf_t *bp; 332 int error = 0; 333 334 if (vd_lh == NULL) 335 return (EINVAL); 336 337 ASSERT(flags & B_READ || flags & B_WRITE); 338 339 bp = getrbuf(KM_SLEEP); 340 bp->b_flags = flags | B_BUSY | B_NOCACHE | B_FAILFAST; 341 bp->b_bcount = size; 342 bp->b_un.b_addr = (void *)data; 343 bp->b_lblkno = lbtodb(offset); 344 bp->b_bufsize = size; 345 346 error = ldi_strategy(vd_lh, bp); 347 ASSERT(error == 0); 348 if ((error = biowait(bp)) == 0 && bp->b_resid != 0) 349 error = EIO; 350 freerbuf(bp); 351 352 return (error); 353 } 354 355 static void 356 vdev_disk_io_intr(buf_t *bp) 357 { 358 vdev_disk_buf_t *vdb = (vdev_disk_buf_t *)bp; 359 zio_t *zio = vdb->vdb_io; 360 361 /* 362 * The rest of the zio stack only deals with EIO, ECKSUM, and ENXIO. 363 * Rather than teach the rest of the stack about other error 364 * possibilities (EFAULT, etc), we normalize the error value here. 365 */ 366 zio->io_error = (geterror(bp) != 0 ? EIO : 0); 367 368 if (zio->io_error == 0 && bp->b_resid != 0) 369 zio->io_error = EIO; 370 371 kmem_free(vdb, sizeof (vdev_disk_buf_t)); 372 373 zio_interrupt(zio); 374 } 375 376 static void 377 vdev_disk_ioctl_free(zio_t *zio) 378 { 379 kmem_free(zio->io_vsd, sizeof (struct dk_callback)); 380 } 381 382 static const zio_vsd_ops_t vdev_disk_vsd_ops = { 383 vdev_disk_ioctl_free, 384 zio_vsd_default_cksum_report 385 }; 386 387 static void 388 vdev_disk_ioctl_done(void *zio_arg, int error) 389 { 390 zio_t *zio = zio_arg; 391 392 zio->io_error = error; 393 394 zio_interrupt(zio); 395 } 396 397 static int 398 vdev_disk_io_start(zio_t *zio) 399 { 400 vdev_t *vd = zio->io_vd; 401 vdev_disk_t *dvd = vd->vdev_tsd; 402 vdev_disk_buf_t *vdb; 403 struct dk_callback *dkc; 404 buf_t *bp; 405 int error; 406 407 if (zio->io_type == ZIO_TYPE_IOCTL) { 408 /* XXPOLICY */ 409 if (!vdev_readable(vd)) { 410 zio->io_error = ENXIO; 411 return (ZIO_PIPELINE_CONTINUE); 412 } 413 414 switch (zio->io_cmd) { 415 416 case DKIOCFLUSHWRITECACHE: 417 418 if (zfs_nocacheflush) 419 break; 420 421 if (vd->vdev_nowritecache) { 422 zio->io_error = ENOTSUP; 423 break; 424 } 425 426 zio->io_vsd = dkc = kmem_alloc(sizeof (*dkc), KM_SLEEP); 427 zio->io_vsd_ops = &vdev_disk_vsd_ops; 428 429 dkc->dkc_callback = vdev_disk_ioctl_done; 430 dkc->dkc_flag = FLUSH_VOLATILE; 431 dkc->dkc_cookie = zio; 432 433 error = ldi_ioctl(dvd->vd_lh, zio->io_cmd, 434 (uintptr_t)dkc, FKIOCTL, kcred, NULL); 435 436 if (error == 0) { 437 /* 438 * The ioctl will be done asychronously, 439 * and will call vdev_disk_ioctl_done() 440 * upon completion. 441 */ 442 return (ZIO_PIPELINE_STOP); 443 } 444 445 if (error == ENOTSUP || error == ENOTTY) { 446 /* 447 * If we get ENOTSUP or ENOTTY, we know that 448 * no future attempts will ever succeed. 449 * In this case we set a persistent bit so 450 * that we don't bother with the ioctl in the 451 * future. 452 */ 453 vd->vdev_nowritecache = B_TRUE; 454 } 455 zio->io_error = error; 456 457 break; 458 459 default: 460 zio->io_error = ENOTSUP; 461 } 462 463 return (ZIO_PIPELINE_CONTINUE); 464 } 465 466 vdb = kmem_alloc(sizeof (vdev_disk_buf_t), KM_SLEEP); 467 468 vdb->vdb_io = zio; 469 bp = &vdb->vdb_buf; 470 471 bioinit(bp); 472 bp->b_flags = B_BUSY | B_NOCACHE | 473 (zio->io_type == ZIO_TYPE_READ ? B_READ : B_WRITE); 474 if (!(zio->io_flags & (ZIO_FLAG_IO_RETRY | ZIO_FLAG_TRYHARD))) 475 bp->b_flags |= B_FAILFAST; 476 bp->b_bcount = zio->io_size; 477 bp->b_un.b_addr = zio->io_data; 478 bp->b_lblkno = lbtodb(zio->io_offset); 479 bp->b_bufsize = zio->io_size; 480 bp->b_iodone = (int (*)())vdev_disk_io_intr; 481 482 /* ldi_strategy() will return non-zero only on programming errors */ 483 VERIFY(ldi_strategy(dvd->vd_lh, bp) == 0); 484 485 return (ZIO_PIPELINE_STOP); 486 } 487 488 static void 489 vdev_disk_io_done(zio_t *zio) 490 { 491 vdev_t *vd = zio->io_vd; 492 493 /* 494 * If the device returned EIO, then attempt a DKIOCSTATE ioctl to see if 495 * the device has been removed. If this is the case, then we trigger an 496 * asynchronous removal of the device. Otherwise, probe the device and 497 * make sure it's still accessible. 498 */ 499 if (zio->io_error == EIO && !vd->vdev_remove_wanted) { 500 vdev_disk_t *dvd = vd->vdev_tsd; 501 int state = DKIO_NONE; 502 503 if (ldi_ioctl(dvd->vd_lh, DKIOCSTATE, (intptr_t)&state, 504 FKIOCTL, kcred, NULL) == 0 && state != DKIO_INSERTED) { 505 /* 506 * We post the resource as soon as possible, instead of 507 * when the async removal actually happens, because the 508 * DE is using this information to discard previous I/O 509 * errors. 510 */ 511 zfs_post_remove(zio->io_spa, vd); 512 vd->vdev_remove_wanted = B_TRUE; 513 spa_async_request(zio->io_spa, SPA_ASYNC_REMOVE); 514 } 515 } 516 } 517 518 vdev_ops_t vdev_disk_ops = { 519 vdev_disk_open, 520 vdev_disk_close, 521 vdev_default_asize, 522 vdev_disk_io_start, 523 vdev_disk_io_done, 524 NULL, 525 vdev_disk_hold, 526 vdev_disk_rele, 527 VDEV_TYPE_DISK, /* name of this vdev type */ 528 B_TRUE /* leaf vdev */ 529 }; 530 531 /* 532 * Given the root disk device devid or pathname, read the label from 533 * the device, and construct a configuration nvlist. 534 */ 535 int 536 vdev_disk_read_rootlabel(char *devpath, char *devid, nvlist_t **config) 537 { 538 ldi_handle_t vd_lh; 539 vdev_label_t *label; 540 uint64_t s, size; 541 int l; 542 ddi_devid_t tmpdevid; 543 int error = -1; 544 char *minor_name; 545 546 /* 547 * Read the device label and build the nvlist. 548 */ 549 if (devid != NULL && ddi_devid_str_decode(devid, &tmpdevid, 550 &minor_name) == 0) { 551 error = ldi_open_by_devid(tmpdevid, minor_name, 552 FREAD, kcred, &vd_lh, zfs_li); 553 ddi_devid_free(tmpdevid); 554 ddi_devid_str_free(minor_name); 555 } 556 557 if (error && (error = ldi_open_by_name(devpath, FREAD, kcred, &vd_lh, 558 zfs_li))) 559 return (error); 560 561 if (ldi_get_size(vd_lh, &s)) { 562 (void) ldi_close(vd_lh, FREAD, kcred); 563 return (EIO); 564 } 565 566 size = P2ALIGN_TYPED(s, sizeof (vdev_label_t), uint64_t); 567 label = kmem_alloc(sizeof (vdev_label_t), KM_SLEEP); 568 569 *config = NULL; 570 for (l = 0; l < VDEV_LABELS; l++) { 571 uint64_t offset, state, txg = 0; 572 573 /* read vdev label */ 574 offset = vdev_label_offset(size, l, 0); 575 if (vdev_disk_physio(vd_lh, (caddr_t)label, 576 VDEV_SKIP_SIZE + VDEV_PHYS_SIZE, offset, B_READ) != 0) 577 continue; 578 579 if (nvlist_unpack(label->vl_vdev_phys.vp_nvlist, 580 sizeof (label->vl_vdev_phys.vp_nvlist), config, 0) != 0) { 581 *config = NULL; 582 continue; 583 } 584 585 if (nvlist_lookup_uint64(*config, ZPOOL_CONFIG_POOL_STATE, 586 &state) != 0 || state >= POOL_STATE_DESTROYED) { 587 nvlist_free(*config); 588 *config = NULL; 589 continue; 590 } 591 592 if (nvlist_lookup_uint64(*config, ZPOOL_CONFIG_POOL_TXG, 593 &txg) != 0 || txg == 0) { 594 nvlist_free(*config); 595 *config = NULL; 596 continue; 597 } 598 599 break; 600 } 601 602 kmem_free(label, sizeof (vdev_label_t)); 603 (void) ldi_close(vd_lh, FREAD, kcred); 604 if (*config == NULL) 605 error = EIDRM; 606 607 return (error); 608 } 609