7938 Port ZOL #3712 disable LBA weighting on files and SSDs
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 (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 23 * Copyright (c) 2012, 2015 by Delphix. All rights reserved. 24 * Copyright 2016 Nexenta Systems, Inc. All rights reserved. 25 * Copyright (c) 2013 Joyent, Inc. All rights reserved. 26 */ 27 28 #include <sys/zfs_context.h> 29 #include <sys/spa_impl.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 #include <sys/efi_partition.h> 37 #include <sys/fm/fs/zfs.h> 38 39 /* 40 * Virtual device vector for disks. 41 */ 42 43 extern ldi_ident_t zfs_li; 44 45 static void vdev_disk_close(vdev_t *); 46 47 typedef struct vdev_disk_ldi_cb { 48 list_node_t lcb_next; 49 ldi_callback_id_t lcb_id; 50 } vdev_disk_ldi_cb_t; 51 52 static void 53 vdev_disk_alloc(vdev_t *vd) 54 { 55 vdev_disk_t *dvd; 56 57 dvd = vd->vdev_tsd = kmem_zalloc(sizeof (vdev_disk_t), KM_SLEEP); 58 /* 59 * Create the LDI event callback list. 60 */ 61 list_create(&dvd->vd_ldi_cbs, sizeof (vdev_disk_ldi_cb_t), 62 offsetof(vdev_disk_ldi_cb_t, lcb_next)); 63 } 64 65 static void 66 vdev_disk_free(vdev_t *vd) 67 { 68 vdev_disk_t *dvd = vd->vdev_tsd; 69 vdev_disk_ldi_cb_t *lcb; 70 71 if (dvd == NULL) 72 return; 73 74 /* 75 * We have already closed the LDI handle. Clean up the LDI event 76 * callbacks and free vd->vdev_tsd. 77 */ 78 while ((lcb = list_head(&dvd->vd_ldi_cbs)) != NULL) { 79 list_remove(&dvd->vd_ldi_cbs, lcb); 80 (void) ldi_ev_remove_callbacks(lcb->lcb_id); 81 kmem_free(lcb, sizeof (vdev_disk_ldi_cb_t)); 82 } 83 list_destroy(&dvd->vd_ldi_cbs); 84 kmem_free(dvd, sizeof (vdev_disk_t)); 85 vd->vdev_tsd = NULL; 86 } 87 88 /* ARGSUSED */ 89 static int 90 vdev_disk_off_notify(ldi_handle_t lh, ldi_ev_cookie_t ecookie, void *arg, 91 void *ev_data) 92 { 93 vdev_t *vd = (vdev_t *)arg; 94 vdev_disk_t *dvd = vd->vdev_tsd; 95 96 /* 97 * Ignore events other than offline. 98 */ 99 if (strcmp(ldi_ev_get_type(ecookie), LDI_EV_OFFLINE) != 0) 100 return (LDI_EV_SUCCESS); 101 102 /* 103 * All LDI handles must be closed for the state change to succeed, so 104 * call on vdev_disk_close() to do this. 105 * 106 * We inform vdev_disk_close that it is being called from offline 107 * notify context so it will defer cleanup of LDI event callbacks and 108 * freeing of vd->vdev_tsd to the offline finalize or a reopen. 109 */ 110 dvd->vd_ldi_offline = B_TRUE; 111 vdev_disk_close(vd); 112 113 /* 114 * Now that the device is closed, request that the spa_async_thread 115 * mark the device as REMOVED and notify FMA of the removal. 116 */ 117 zfs_post_remove(vd->vdev_spa, vd); 118 vd->vdev_remove_wanted = B_TRUE; 119 spa_async_request(vd->vdev_spa, SPA_ASYNC_REMOVE); 120 121 return (LDI_EV_SUCCESS); 122 } 123 124 /* ARGSUSED */ 125 static void 126 vdev_disk_off_finalize(ldi_handle_t lh, ldi_ev_cookie_t ecookie, 127 int ldi_result, void *arg, void *ev_data) 128 { 129 vdev_t *vd = (vdev_t *)arg; 130 131 /* 132 * Ignore events other than offline. 133 */ 134 if (strcmp(ldi_ev_get_type(ecookie), LDI_EV_OFFLINE) != 0) 135 return; 136 137 /* 138 * We have already closed the LDI handle in notify. 139 * Clean up the LDI event callbacks and free vd->vdev_tsd. 140 */ 141 vdev_disk_free(vd); 142 143 /* 144 * Request that the vdev be reopened if the offline state change was 145 * unsuccessful. 146 */ 147 if (ldi_result != LDI_EV_SUCCESS) { 148 vd->vdev_probe_wanted = B_TRUE; 149 spa_async_request(vd->vdev_spa, SPA_ASYNC_PROBE); 150 } 151 } 152 153 static ldi_ev_callback_t vdev_disk_off_callb = { 154 .cb_vers = LDI_EV_CB_VERS, 155 .cb_notify = vdev_disk_off_notify, 156 .cb_finalize = vdev_disk_off_finalize 157 }; 158 159 /* ARGSUSED */ 160 static void 161 vdev_disk_dgrd_finalize(ldi_handle_t lh, ldi_ev_cookie_t ecookie, 162 int ldi_result, void *arg, void *ev_data) 163 { 164 vdev_t *vd = (vdev_t *)arg; 165 166 /* 167 * Ignore events other than degrade. 168 */ 169 if (strcmp(ldi_ev_get_type(ecookie), LDI_EV_DEGRADE) != 0) 170 return; 171 172 /* 173 * Degrade events always succeed. Mark the vdev as degraded. 174 * This status is purely informative for the user. 175 */ 176 (void) vdev_degrade(vd->vdev_spa, vd->vdev_guid, 0); 177 } 178 179 static ldi_ev_callback_t vdev_disk_dgrd_callb = { 180 .cb_vers = LDI_EV_CB_VERS, 181 .cb_notify = NULL, 182 .cb_finalize = vdev_disk_dgrd_finalize 183 }; 184 185 static void 186 vdev_disk_hold(vdev_t *vd) 187 { 188 ddi_devid_t devid; 189 char *minor; 190 191 ASSERT(spa_config_held(vd->vdev_spa, SCL_STATE, RW_WRITER)); 192 193 /* 194 * We must have a pathname, and it must be absolute. 195 */ 196 if (vd->vdev_path == NULL || vd->vdev_path[0] != '/') 197 return; 198 199 /* 200 * Only prefetch path and devid info if the device has 201 * never been opened. 202 */ 203 if (vd->vdev_tsd != NULL) 204 return; 205 206 if (vd->vdev_wholedisk == -1ULL) { 207 size_t len = strlen(vd->vdev_path) + 3; 208 char *buf = kmem_alloc(len, KM_SLEEP); 209 210 (void) snprintf(buf, len, "%ss0", vd->vdev_path); 211 212 (void) ldi_vp_from_name(buf, &vd->vdev_name_vp); 213 kmem_free(buf, len); 214 } 215 216 if (vd->vdev_name_vp == NULL) 217 (void) ldi_vp_from_name(vd->vdev_path, &vd->vdev_name_vp); 218 219 if (vd->vdev_devid != NULL && 220 ddi_devid_str_decode(vd->vdev_devid, &devid, &minor) == 0) { 221 (void) ldi_vp_from_devid(devid, minor, &vd->vdev_devid_vp); 222 ddi_devid_str_free(minor); 223 ddi_devid_free(devid); 224 } 225 } 226 227 static void 228 vdev_disk_rele(vdev_t *vd) 229 { 230 ASSERT(spa_config_held(vd->vdev_spa, SCL_STATE, RW_WRITER)); 231 232 if (vd->vdev_name_vp) { 233 VN_RELE_ASYNC(vd->vdev_name_vp, 234 dsl_pool_vnrele_taskq(vd->vdev_spa->spa_dsl_pool)); 235 vd->vdev_name_vp = NULL; 236 } 237 if (vd->vdev_devid_vp) { 238 VN_RELE_ASYNC(vd->vdev_devid_vp, 239 dsl_pool_vnrele_taskq(vd->vdev_spa->spa_dsl_pool)); 240 vd->vdev_devid_vp = NULL; 241 } 242 } 243 244 /* 245 * We want to be loud in DEBUG kernels when DKIOCGMEDIAINFOEXT fails, or when 246 * even a fallback to DKIOCGMEDIAINFO fails. 247 */ 248 #ifdef DEBUG 249 #define VDEV_DEBUG(...) cmn_err(CE_NOTE, __VA_ARGS__) 250 #else 251 #define VDEV_DEBUG(...) /* Nothing... */ 252 #endif 253 254 static int 255 vdev_disk_open(vdev_t *vd, uint64_t *psize, uint64_t *max_psize, 256 uint64_t *ashift) 257 { 258 spa_t *spa = vd->vdev_spa; 259 vdev_disk_t *dvd = vd->vdev_tsd; 260 ldi_ev_cookie_t ecookie; 261 vdev_disk_ldi_cb_t *lcb; 262 union { 263 struct dk_minfo_ext ude; 264 struct dk_minfo ud; 265 } dks; 266 struct dk_minfo_ext *dkmext = &dks.ude; 267 struct dk_minfo *dkm = &dks.ud; 268 int error; 269 dev_t dev; 270 int otyp; 271 boolean_t validate_devid = B_FALSE; 272 ddi_devid_t devid; 273 uint64_t capacity = 0, blksz = 0, pbsize; 274 275 /* 276 * We must have a pathname, and it must be absolute. 277 */ 278 if (vd->vdev_path == NULL || vd->vdev_path[0] != '/') { 279 vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL; 280 return (SET_ERROR(EINVAL)); 281 } 282 283 /* 284 * Reopen the device if it's not currently open. Otherwise, 285 * just update the physical size of the device. 286 */ 287 if (dvd != NULL) { 288 if (dvd->vd_ldi_offline && dvd->vd_lh == NULL) { 289 /* 290 * If we are opening a device in its offline notify 291 * context, the LDI handle was just closed. Clean 292 * up the LDI event callbacks and free vd->vdev_tsd. 293 */ 294 vdev_disk_free(vd); 295 } else { 296 ASSERT(vd->vdev_reopening); 297 goto skip_open; 298 } 299 } 300 301 /* 302 * Create vd->vdev_tsd. 303 */ 304 vdev_disk_alloc(vd); 305 dvd = vd->vdev_tsd; 306 307 /* 308 * When opening a disk device, we want to preserve the user's original 309 * intent. We always want to open the device by the path the user gave 310 * us, even if it is one of multiple paths to the same device. But we 311 * also want to be able to survive disks being removed/recabled. 312 * Therefore the sequence of opening devices is: 313 * 314 * 1. Try opening the device by path. For legacy pools without the 315 * 'whole_disk' property, attempt to fix the path by appending 's0'. 316 * 317 * 2. If the devid of the device matches the stored value, return 318 * success. 319 * 320 * 3. Otherwise, the device may have moved. Try opening the device 321 * by the devid instead. 322 */ 323 if (vd->vdev_devid != NULL) { 324 if (ddi_devid_str_decode(vd->vdev_devid, &dvd->vd_devid, 325 &dvd->vd_minor) != 0) { 326 vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL; 327 return (SET_ERROR(EINVAL)); 328 } 329 } 330 331 error = EINVAL; /* presume failure */ 332 333 if (vd->vdev_path != NULL) { 334 335 if (vd->vdev_wholedisk == -1ULL) { 336 size_t len = strlen(vd->vdev_path) + 3; 337 char *buf = kmem_alloc(len, KM_SLEEP); 338 339 (void) snprintf(buf, len, "%ss0", vd->vdev_path); 340 341 error = ldi_open_by_name(buf, spa_mode(spa), kcred, 342 &dvd->vd_lh, zfs_li); 343 if (error == 0) { 344 spa_strfree(vd->vdev_path); 345 vd->vdev_path = buf; 346 vd->vdev_wholedisk = 1ULL; 347 } else { 348 kmem_free(buf, len); 349 } 350 } 351 352 /* 353 * If we have not yet opened the device, try to open it by the 354 * specified path. 355 */ 356 if (error != 0) { 357 error = ldi_open_by_name(vd->vdev_path, spa_mode(spa), 358 kcred, &dvd->vd_lh, zfs_li); 359 } 360 361 /* 362 * Compare the devid to the stored value. 363 */ 364 if (error == 0 && vd->vdev_devid != NULL && 365 ldi_get_devid(dvd->vd_lh, &devid) == 0) { 366 if (ddi_devid_compare(devid, dvd->vd_devid) != 0) { 367 error = SET_ERROR(EINVAL); 368 (void) ldi_close(dvd->vd_lh, spa_mode(spa), 369 kcred); 370 dvd->vd_lh = NULL; 371 } 372 ddi_devid_free(devid); 373 } 374 375 /* 376 * If we succeeded in opening the device, but 'vdev_wholedisk' 377 * is not yet set, then this must be a slice. 378 */ 379 if (error == 0 && vd->vdev_wholedisk == -1ULL) 380 vd->vdev_wholedisk = 0; 381 } 382 383 /* 384 * If we were unable to open by path, or the devid check fails, open by 385 * devid instead. 386 */ 387 if (error != 0 && vd->vdev_devid != NULL) { 388 error = ldi_open_by_devid(dvd->vd_devid, dvd->vd_minor, 389 spa_mode(spa), kcred, &dvd->vd_lh, zfs_li); 390 } 391 392 /* 393 * If all else fails, then try opening by physical path (if available) 394 * or the logical path (if we failed due to the devid check). While not 395 * as reliable as the devid, this will give us something, and the higher 396 * level vdev validation will prevent us from opening the wrong device. 397 */ 398 if (error) { 399 if (vd->vdev_devid != NULL) 400 validate_devid = B_TRUE; 401 402 if (vd->vdev_physpath != NULL && 403 (dev = ddi_pathname_to_dev_t(vd->vdev_physpath)) != NODEV) 404 error = ldi_open_by_dev(&dev, OTYP_BLK, spa_mode(spa), 405 kcred, &dvd->vd_lh, zfs_li); 406 407 /* 408 * Note that we don't support the legacy auto-wholedisk support 409 * as above. This hasn't been used in a very long time and we 410 * don't need to propagate its oddities to this edge condition. 411 */ 412 if (error && vd->vdev_path != NULL) 413 error = ldi_open_by_name(vd->vdev_path, spa_mode(spa), 414 kcred, &dvd->vd_lh, zfs_li); 415 } 416 417 if (error) { 418 vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED; 419 return (error); 420 } 421 422 /* 423 * Now that the device has been successfully opened, update the devid 424 * if necessary. 425 */ 426 if (validate_devid && spa_writeable(spa) && 427 ldi_get_devid(dvd->vd_lh, &devid) == 0) { 428 if (ddi_devid_compare(devid, dvd->vd_devid) != 0) { 429 char *vd_devid; 430 431 vd_devid = ddi_devid_str_encode(devid, dvd->vd_minor); 432 zfs_dbgmsg("vdev %s: update devid from %s, " 433 "to %s", vd->vdev_path, vd->vdev_devid, vd_devid); 434 spa_strfree(vd->vdev_devid); 435 vd->vdev_devid = spa_strdup(vd_devid); 436 ddi_devid_str_free(vd_devid); 437 } 438 ddi_devid_free(devid); 439 } 440 441 /* 442 * Once a device is opened, verify that the physical device path (if 443 * available) is up to date. 444 */ 445 if (ldi_get_dev(dvd->vd_lh, &dev) == 0 && 446 ldi_get_otyp(dvd->vd_lh, &otyp) == 0) { 447 char *physpath, *minorname; 448 449 physpath = kmem_alloc(MAXPATHLEN, KM_SLEEP); 450 minorname = NULL; 451 if (ddi_dev_pathname(dev, otyp, physpath) == 0 && 452 ldi_get_minor_name(dvd->vd_lh, &minorname) == 0 && 453 (vd->vdev_physpath == NULL || 454 strcmp(vd->vdev_physpath, physpath) != 0)) { 455 if (vd->vdev_physpath) 456 spa_strfree(vd->vdev_physpath); 457 (void) strlcat(physpath, ":", MAXPATHLEN); 458 (void) strlcat(physpath, minorname, MAXPATHLEN); 459 vd->vdev_physpath = spa_strdup(physpath); 460 } 461 if (minorname) 462 kmem_free(minorname, strlen(minorname) + 1); 463 kmem_free(physpath, MAXPATHLEN); 464 } 465 466 /* 467 * Register callbacks for the LDI offline event. 468 */ 469 if (ldi_ev_get_cookie(dvd->vd_lh, LDI_EV_OFFLINE, &ecookie) == 470 LDI_EV_SUCCESS) { 471 lcb = kmem_zalloc(sizeof (vdev_disk_ldi_cb_t), KM_SLEEP); 472 list_insert_tail(&dvd->vd_ldi_cbs, lcb); 473 (void) ldi_ev_register_callbacks(dvd->vd_lh, ecookie, 474 &vdev_disk_off_callb, (void *) vd, &lcb->lcb_id); 475 } 476 477 /* 478 * Register callbacks for the LDI degrade event. 479 */ 480 if (ldi_ev_get_cookie(dvd->vd_lh, LDI_EV_DEGRADE, &ecookie) == 481 LDI_EV_SUCCESS) { 482 lcb = kmem_zalloc(sizeof (vdev_disk_ldi_cb_t), KM_SLEEP); 483 list_insert_tail(&dvd->vd_ldi_cbs, lcb); 484 (void) ldi_ev_register_callbacks(dvd->vd_lh, ecookie, 485 &vdev_disk_dgrd_callb, (void *) vd, &lcb->lcb_id); 486 } 487 skip_open: 488 /* 489 * Determine the actual size of the device. 490 */ 491 if (ldi_get_size(dvd->vd_lh, psize) != 0) { 492 vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED; 493 return (SET_ERROR(EINVAL)); 494 } 495 496 *max_psize = *psize; 497 498 /* 499 * Determine the device's minimum transfer size. 500 * If the ioctl isn't supported, assume DEV_BSIZE. 501 */ 502 if ((error = ldi_ioctl(dvd->vd_lh, DKIOCGMEDIAINFOEXT, 503 (intptr_t)dkmext, FKIOCTL, kcred, NULL)) == 0) { 504 capacity = dkmext->dki_capacity - 1; 505 blksz = dkmext->dki_lbsize; 506 pbsize = dkmext->dki_pbsize; 507 } else if ((error = ldi_ioctl(dvd->vd_lh, DKIOCGMEDIAINFO, 508 (intptr_t)dkm, FKIOCTL, kcred, NULL)) == 0) { 509 VDEV_DEBUG( 510 "vdev_disk_open(\"%s\"): fallback to DKIOCGMEDIAINFO\n", 511 vd->vdev_path); 512 capacity = dkm->dki_capacity - 1; 513 blksz = dkm->dki_lbsize; 514 pbsize = blksz; 515 } else { 516 VDEV_DEBUG("vdev_disk_open(\"%s\"): " 517 "both DKIOCGMEDIAINFO{,EXT} calls failed, %d\n", 518 vd->vdev_path, error); 519 pbsize = DEV_BSIZE; 520 } 521 522 *ashift = highbit64(MAX(pbsize, SPA_MINBLOCKSIZE)) - 1; 523 524 if (vd->vdev_wholedisk == 1) { 525 int wce = 1; 526 527 if (error == 0) { 528 /* 529 * If we have the capability to expand, we'd have 530 * found out via success from DKIOCGMEDIAINFO{,EXT}. 531 * Adjust max_psize upward accordingly since we know 532 * we own the whole disk now. 533 */ 534 *max_psize = capacity * blksz; 535 } 536 537 /* 538 * Since we own the whole disk, try to enable disk write 539 * caching. We ignore errors because it's OK if we can't do it. 540 */ 541 (void) ldi_ioctl(dvd->vd_lh, DKIOCSETWCE, (intptr_t)&wce, 542 FKIOCTL, kcred, NULL); 543 } 544 545 /* 546 * Clear the nowritecache bit, so that on a vdev_reopen() we will 547 * try again. 548 */ 549 vd->vdev_nowritecache = B_FALSE; 550 551 return (0); 552 } 553 554 static void 555 vdev_disk_close(vdev_t *vd) 556 { 557 vdev_disk_t *dvd = vd->vdev_tsd; 558 559 if (vd->vdev_reopening || dvd == NULL) 560 return; 561 562 if (dvd->vd_minor != NULL) { 563 ddi_devid_str_free(dvd->vd_minor); 564 dvd->vd_minor = NULL; 565 } 566 567 if (dvd->vd_devid != NULL) { 568 ddi_devid_free(dvd->vd_devid); 569 dvd->vd_devid = NULL; 570 } 571 572 if (dvd->vd_lh != NULL) { 573 (void) ldi_close(dvd->vd_lh, spa_mode(vd->vdev_spa), kcred); 574 dvd->vd_lh = NULL; 575 } 576 577 vd->vdev_delayed_close = B_FALSE; 578 /* 579 * If we closed the LDI handle due to an offline notify from LDI, 580 * don't free vd->vdev_tsd or unregister the callbacks here; 581 * the offline finalize callback or a reopen will take care of it. 582 */ 583 if (dvd->vd_ldi_offline) 584 return; 585 586 vdev_disk_free(vd); 587 } 588 589 int 590 vdev_disk_physio(vdev_t *vd, caddr_t data, 591 size_t size, uint64_t offset, int flags, boolean_t isdump) 592 { 593 vdev_disk_t *dvd = vd->vdev_tsd; 594 595 /* 596 * If the vdev is closed, it's likely in the REMOVED or FAULTED state. 597 * Nothing to be done here but return failure. 598 */ 599 if (dvd == NULL || (dvd->vd_ldi_offline && dvd->vd_lh == NULL)) 600 return (EIO); 601 602 ASSERT(vd->vdev_ops == &vdev_disk_ops); 603 604 /* 605 * If in the context of an active crash dump, use the ldi_dump(9F) 606 * call instead of ldi_strategy(9F) as usual. 607 */ 608 if (isdump) { 609 ASSERT3P(dvd, !=, NULL); 610 return (ldi_dump(dvd->vd_lh, data, lbtodb(offset), 611 lbtodb(size))); 612 } 613 614 return (vdev_disk_ldi_physio(dvd->vd_lh, data, size, offset, flags)); 615 } 616 617 int 618 vdev_disk_ldi_physio(ldi_handle_t vd_lh, caddr_t data, 619 size_t size, uint64_t offset, int flags) 620 { 621 buf_t *bp; 622 int error = 0; 623 624 if (vd_lh == NULL) 625 return (SET_ERROR(EINVAL)); 626 627 ASSERT(flags & B_READ || flags & B_WRITE); 628 629 bp = getrbuf(KM_SLEEP); 630 bp->b_flags = flags | B_BUSY | B_NOCACHE | B_FAILFAST; 631 bp->b_bcount = size; 632 bp->b_un.b_addr = (void *)data; 633 bp->b_lblkno = lbtodb(offset); 634 bp->b_bufsize = size; 635 636 error = ldi_strategy(vd_lh, bp); 637 ASSERT(error == 0); 638 if ((error = biowait(bp)) == 0 && bp->b_resid != 0) 639 error = SET_ERROR(EIO); 640 freerbuf(bp); 641 642 return (error); 643 } 644 645 static void 646 vdev_disk_io_intr(buf_t *bp) 647 { 648 vdev_buf_t *vb = (vdev_buf_t *)bp; 649 zio_t *zio = vb->vb_io; 650 651 /* 652 * The rest of the zio stack only deals with EIO, ECKSUM, and ENXIO. 653 * Rather than teach the rest of the stack about other error 654 * possibilities (EFAULT, etc), we normalize the error value here. 655 */ 656 zio->io_error = (geterror(bp) != 0 ? EIO : 0); 657 658 if (zio->io_error == 0 && bp->b_resid != 0) 659 zio->io_error = SET_ERROR(EIO); 660 661 kmem_free(vb, sizeof (vdev_buf_t)); 662 663 zio_delay_interrupt(zio); 664 } 665 666 static void 667 vdev_disk_ioctl_free(zio_t *zio) 668 { 669 kmem_free(zio->io_vsd, sizeof (struct dk_callback)); 670 } 671 672 static const zio_vsd_ops_t vdev_disk_vsd_ops = { 673 vdev_disk_ioctl_free, 674 zio_vsd_default_cksum_report 675 }; 676 677 static void 678 vdev_disk_ioctl_done(void *zio_arg, int error) 679 { 680 zio_t *zio = zio_arg; 681 682 zio->io_error = error; 683 684 zio_interrupt(zio); 685 } 686 687 static void 688 vdev_disk_io_start(zio_t *zio) 689 { 690 vdev_t *vd = zio->io_vd; 691 vdev_disk_t *dvd = vd->vdev_tsd; 692 vdev_buf_t *vb; 693 struct dk_callback *dkc; 694 buf_t *bp; 695 int error; 696 697 /* 698 * If the vdev is closed, it's likely in the REMOVED or FAULTED state. 699 * Nothing to be done here but return failure. 700 */ 701 if (dvd == NULL || (dvd->vd_ldi_offline && dvd->vd_lh == NULL)) { 702 zio->io_error = ENXIO; 703 zio_interrupt(zio); 704 return; 705 } 706 707 if (zio->io_type == ZIO_TYPE_IOCTL) { 708 /* XXPOLICY */ 709 if (!vdev_readable(vd)) { 710 zio->io_error = SET_ERROR(ENXIO); 711 zio_interrupt(zio); 712 return; 713 } 714 715 switch (zio->io_cmd) { 716 717 case DKIOCFLUSHWRITECACHE: 718 719 if (zfs_nocacheflush) 720 break; 721 722 if (vd->vdev_nowritecache) { 723 zio->io_error = SET_ERROR(ENOTSUP); 724 break; 725 } 726 727 zio->io_vsd = dkc = kmem_alloc(sizeof (*dkc), KM_SLEEP); 728 zio->io_vsd_ops = &vdev_disk_vsd_ops; 729 730 dkc->dkc_callback = vdev_disk_ioctl_done; 731 dkc->dkc_flag = FLUSH_VOLATILE; 732 dkc->dkc_cookie = zio; 733 734 error = ldi_ioctl(dvd->vd_lh, zio->io_cmd, 735 (uintptr_t)dkc, FKIOCTL, kcred, NULL); 736 737 if (error == 0) { 738 /* 739 * The ioctl will be done asychronously, 740 * and will call vdev_disk_ioctl_done() 741 * upon completion. 742 */ 743 return; 744 } 745 746 zio->io_error = error; 747 748 break; 749 750 default: 751 zio->io_error = SET_ERROR(ENOTSUP); 752 } 753 754 zio_execute(zio); 755 return; 756 } 757 758 ASSERT(zio->io_type == ZIO_TYPE_READ || zio->io_type == ZIO_TYPE_WRITE); 759 zio->io_target_timestamp = zio_handle_io_delay(zio); 760 761 vb = kmem_alloc(sizeof (vdev_buf_t), KM_SLEEP); 762 763 vb->vb_io = zio; 764 bp = &vb->vb_buf; 765 766 bioinit(bp); 767 bp->b_flags = B_BUSY | B_NOCACHE | 768 (zio->io_type == ZIO_TYPE_READ ? B_READ : B_WRITE); 769 if (!(zio->io_flags & (ZIO_FLAG_IO_RETRY | ZIO_FLAG_TRYHARD))) 770 bp->b_flags |= B_FAILFAST; 771 bp->b_bcount = zio->io_size; 772 bp->b_un.b_addr = zio->io_data; 773 bp->b_lblkno = lbtodb(zio->io_offset); 774 bp->b_bufsize = zio->io_size; 775 bp->b_iodone = (int (*)())vdev_disk_io_intr; 776 777 /* ldi_strategy() will return non-zero only on programming errors */ 778 VERIFY(ldi_strategy(dvd->vd_lh, bp) == 0); 779 } 780 781 static void 782 vdev_disk_io_done(zio_t *zio) 783 { 784 vdev_t *vd = zio->io_vd; 785 786 /* 787 * If the device returned EIO, then attempt a DKIOCSTATE ioctl to see if 788 * the device has been removed. If this is the case, then we trigger an 789 * asynchronous removal of the device. Otherwise, probe the device and 790 * make sure it's still accessible. 791 */ 792 if (zio->io_error == EIO && !vd->vdev_remove_wanted) { 793 vdev_disk_t *dvd = vd->vdev_tsd; 794 int state = DKIO_NONE; 795 796 if (ldi_ioctl(dvd->vd_lh, DKIOCSTATE, (intptr_t)&state, 797 FKIOCTL, kcred, NULL) == 0 && state != DKIO_INSERTED) { 798 /* 799 * We post the resource as soon as possible, instead of 800 * when the async removal actually happens, because the 801 * DE is using this information to discard previous I/O 802 * errors. 803 */ 804 zfs_post_remove(zio->io_spa, vd); 805 vd->vdev_remove_wanted = B_TRUE; 806 spa_async_request(zio->io_spa, SPA_ASYNC_REMOVE); 807 } else if (!vd->vdev_delayed_close) { 808 vd->vdev_delayed_close = B_TRUE; 809 } 810 } 811 } 812 813 vdev_ops_t vdev_disk_ops = { 814 vdev_disk_open, 815 vdev_disk_close, 816 vdev_default_asize, 817 vdev_disk_io_start, 818 vdev_disk_io_done, 819 NULL, 820 vdev_disk_hold, 821 vdev_disk_rele, 822 VDEV_TYPE_DISK, /* name of this vdev type */ 823 B_TRUE /* leaf vdev */ 824 }; 825 826 /* 827 * Given the root disk device devid or pathname, read the label from 828 * the device, and construct a configuration nvlist. 829 */ 830 int 831 vdev_disk_read_rootlabel(char *devpath, char *devid, nvlist_t **config) 832 { 833 ldi_handle_t vd_lh; 834 vdev_label_t *label; 835 uint64_t s, size; 836 int l; 837 ddi_devid_t tmpdevid; 838 int error = -1; 839 char *minor_name; 840 841 /* 842 * Read the device label and build the nvlist. 843 */ 844 if (devid != NULL && ddi_devid_str_decode(devid, &tmpdevid, 845 &minor_name) == 0) { 846 error = ldi_open_by_devid(tmpdevid, minor_name, 847 FREAD, kcred, &vd_lh, zfs_li); 848 ddi_devid_free(tmpdevid); 849 ddi_devid_str_free(minor_name); 850 } 851 852 if (error && (error = ldi_open_by_name(devpath, FREAD, kcred, &vd_lh, 853 zfs_li))) 854 return (error); 855 856 if (ldi_get_size(vd_lh, &s)) { 857 (void) ldi_close(vd_lh, FREAD, kcred); 858 return (SET_ERROR(EIO)); 859 } 860 861 size = P2ALIGN_TYPED(s, sizeof (vdev_label_t), uint64_t); 862 label = kmem_alloc(sizeof (vdev_label_t), KM_SLEEP); 863 864 *config = NULL; 865 for (l = 0; l < VDEV_LABELS; l++) { 866 uint64_t offset, state, txg = 0; 867 868 /* read vdev label */ 869 offset = vdev_label_offset(size, l, 0); 870 if (vdev_disk_ldi_physio(vd_lh, (caddr_t)label, 871 VDEV_SKIP_SIZE + VDEV_PHYS_SIZE, offset, B_READ) != 0) 872 continue; 873 874 if (nvlist_unpack(label->vl_vdev_phys.vp_nvlist, 875 sizeof (label->vl_vdev_phys.vp_nvlist), config, 0) != 0) { 876 *config = NULL; 877 continue; 878 } 879 880 if (nvlist_lookup_uint64(*config, ZPOOL_CONFIG_POOL_STATE, 881 &state) != 0 || state >= POOL_STATE_DESTROYED) { 882 nvlist_free(*config); 883 *config = NULL; 884 continue; 885 } 886 887 if (nvlist_lookup_uint64(*config, ZPOOL_CONFIG_POOL_TXG, 888 &txg) != 0 || txg == 0) { 889 nvlist_free(*config); 890 *config = NULL; 891 continue; 892 } 893 894 break; 895 } 896 897 kmem_free(label, sizeof (vdev_label_t)); 898 (void) ldi_close(vd_lh, FREAD, kcred); 899 if (*config == NULL) 900 error = SET_ERROR(EIDRM); 901 902 return (error); 903 } --- EOF ---