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, 2016 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/abd.h>
34 #include <sys/fs/zfs.h>
35 #include <sys/zio.h>
36 #include <sys/sunldi.h>
37 #include <sys/efi_partition.h>
38 #include <sys/fm/fs/zfs.h>
39
40 /*
41 * Virtual device vector for disks.
42 */
43
44 extern ldi_ident_t zfs_li;
45
46 static void vdev_disk_close(vdev_t *);
47
48 typedef struct vdev_disk_ldi_cb {
49 list_node_t lcb_next;
50 ldi_callback_id_t lcb_id;
51 } vdev_disk_ldi_cb_t;
52
53 static void
54 vdev_disk_alloc(vdev_t *vd)
55 {
56 vdev_disk_t *dvd;
57
58 dvd = vd->vdev_tsd = kmem_zalloc(sizeof (vdev_disk_t), KM_SLEEP);
59 /*
60 * Create the LDI event callback list.
61 */
62 list_create(&dvd->vd_ldi_cbs, sizeof (vdev_disk_ldi_cb_t),
63 offsetof(vdev_disk_ldi_cb_t, lcb_next));
64 }
65
66 static void
67 vdev_disk_free(vdev_t *vd)
68 {
69 vdev_disk_t *dvd = vd->vdev_tsd;
70 vdev_disk_ldi_cb_t *lcb;
71
72 if (dvd == NULL)
73 return;
74
75 /*
76 * We have already closed the LDI handle. Clean up the LDI event
77 * callbacks and free vd->vdev_tsd.
78 */
79 while ((lcb = list_head(&dvd->vd_ldi_cbs)) != NULL) {
80 list_remove(&dvd->vd_ldi_cbs, lcb);
81 (void) ldi_ev_remove_callbacks(lcb->lcb_id);
82 kmem_free(lcb, sizeof (vdev_disk_ldi_cb_t));
83 }
84 list_destroy(&dvd->vd_ldi_cbs);
85 kmem_free(dvd, sizeof (vdev_disk_t));
86 vd->vdev_tsd = NULL;
87 }
88
89 /* ARGSUSED */
90 static int
91 vdev_disk_off_notify(ldi_handle_t lh, ldi_ev_cookie_t ecookie, void *arg,
92 void *ev_data)
93 {
94 vdev_t *vd = (vdev_t *)arg;
95 vdev_disk_t *dvd = vd->vdev_tsd;
96
97 /*
98 * Ignore events other than offline.
99 */
100 if (strcmp(ldi_ev_get_type(ecookie), LDI_EV_OFFLINE) != 0)
101 return (LDI_EV_SUCCESS);
102
103 /*
104 * All LDI handles must be closed for the state change to succeed, so
105 * call on vdev_disk_close() to do this.
106 *
107 * We inform vdev_disk_close that it is being called from offline
108 * notify context so it will defer cleanup of LDI event callbacks and
109 * freeing of vd->vdev_tsd to the offline finalize or a reopen.
110 */
111 dvd->vd_ldi_offline = B_TRUE;
112 vdev_disk_close(vd);
113
114 /*
115 * Now that the device is closed, request that the spa_async_thread
116 * mark the device as REMOVED and notify FMA of the removal.
117 */
118 zfs_post_remove(vd->vdev_spa, vd);
119 vd->vdev_remove_wanted = B_TRUE;
120 spa_async_request(vd->vdev_spa, SPA_ASYNC_REMOVE);
121
122 return (LDI_EV_SUCCESS);
123 }
124
125 /* ARGSUSED */
126 static void
127 vdev_disk_off_finalize(ldi_handle_t lh, ldi_ev_cookie_t ecookie,
128 int ldi_result, void *arg, void *ev_data)
129 {
130 vdev_t *vd = (vdev_t *)arg;
131
132 /*
133 * Ignore events other than offline.
134 */
135 if (strcmp(ldi_ev_get_type(ecookie), LDI_EV_OFFLINE) != 0)
136 return;
137
138 /*
139 * We have already closed the LDI handle in notify.
140 * Clean up the LDI event callbacks and free vd->vdev_tsd.
141 */
142 vdev_disk_free(vd);
143
144 /*
145 * Request that the vdev be reopened if the offline state change was
146 * unsuccessful.
147 */
148 if (ldi_result != LDI_EV_SUCCESS) {
149 vd->vdev_probe_wanted = B_TRUE;
150 spa_async_request(vd->vdev_spa, SPA_ASYNC_PROBE);
151 }
152 }
153
154 static ldi_ev_callback_t vdev_disk_off_callb = {
155 .cb_vers = LDI_EV_CB_VERS,
156 .cb_notify = vdev_disk_off_notify,
157 .cb_finalize = vdev_disk_off_finalize
158 };
159
160 /* ARGSUSED */
161 static void
162 vdev_disk_dgrd_finalize(ldi_handle_t lh, ldi_ev_cookie_t ecookie,
163 int ldi_result, void *arg, void *ev_data)
164 {
165 vdev_t *vd = (vdev_t *)arg;
166
167 /*
168 * Ignore events other than degrade.
169 */
170 if (strcmp(ldi_ev_get_type(ecookie), LDI_EV_DEGRADE) != 0)
171 return;
172
173 /*
174 * Degrade events always succeed. Mark the vdev as degraded.
175 * This status is purely informative for the user.
176 */
177 (void) vdev_degrade(vd->vdev_spa, vd->vdev_guid, 0);
178 }
179
180 static ldi_ev_callback_t vdev_disk_dgrd_callb = {
181 .cb_vers = LDI_EV_CB_VERS,
182 .cb_notify = NULL,
183 .cb_finalize = vdev_disk_dgrd_finalize
184 };
185
186 static void
187 vdev_disk_hold(vdev_t *vd)
188 {
189 ddi_devid_t devid;
190 char *minor;
191
192 ASSERT(spa_config_held(vd->vdev_spa, SCL_STATE, RW_WRITER));
193
194 /*
195 * We must have a pathname, and it must be absolute.
196 */
197 if (vd->vdev_path == NULL || vd->vdev_path[0] != '/')
198 return;
199
200 /*
201 * Only prefetch path and devid info if the device has
202 * never been opened.
203 */
204 if (vd->vdev_tsd != NULL)
205 return;
206
207 if (vd->vdev_wholedisk == -1ULL) {
208 size_t len = strlen(vd->vdev_path) + 3;
209 char *buf = kmem_alloc(len, KM_SLEEP);
210
211 (void) snprintf(buf, len, "%ss0", vd->vdev_path);
212
213 (void) ldi_vp_from_name(buf, &vd->vdev_name_vp);
214 kmem_free(buf, len);
215 }
216
217 if (vd->vdev_name_vp == NULL)
218 (void) ldi_vp_from_name(vd->vdev_path, &vd->vdev_name_vp);
219
220 if (vd->vdev_devid != NULL &&
221 ddi_devid_str_decode(vd->vdev_devid, &devid, &minor) == 0) {
222 (void) ldi_vp_from_devid(devid, minor, &vd->vdev_devid_vp);
223 ddi_devid_str_free(minor);
224 ddi_devid_free(devid);
225 }
226 }
227
228 static void
229 vdev_disk_rele(vdev_t *vd)
230 {
231 ASSERT(spa_config_held(vd->vdev_spa, SCL_STATE, RW_WRITER));
232
233 if (vd->vdev_name_vp) {
234 VN_RELE_ASYNC(vd->vdev_name_vp,
235 dsl_pool_vnrele_taskq(vd->vdev_spa->spa_dsl_pool));
236 vd->vdev_name_vp = NULL;
237 }
238 if (vd->vdev_devid_vp) {
239 VN_RELE_ASYNC(vd->vdev_devid_vp,
240 dsl_pool_vnrele_taskq(vd->vdev_spa->spa_dsl_pool));
241 vd->vdev_devid_vp = NULL;
242 }
243 }
244
245 /*
246 * We want to be loud in DEBUG kernels when DKIOCGMEDIAINFOEXT fails, or when
247 * even a fallback to DKIOCGMEDIAINFO fails.
248 */
249 #ifdef DEBUG
250 #define VDEV_DEBUG(...) cmn_err(CE_NOTE, __VA_ARGS__)
251 #else
252 #define VDEV_DEBUG(...) /* Nothing... */
253 #endif
254
255 static int
256 vdev_disk_open(vdev_t *vd, uint64_t *psize, uint64_t *max_psize,
257 uint64_t *ashift)
258 {
259 spa_t *spa = vd->vdev_spa;
260 vdev_disk_t *dvd = vd->vdev_tsd;
261 ldi_ev_cookie_t ecookie;
262 vdev_disk_ldi_cb_t *lcb;
263 union {
264 struct dk_minfo_ext ude;
265 struct dk_minfo ud;
266 } dks;
267 struct dk_minfo_ext *dkmext = &dks.ude;
268 struct dk_minfo *dkm = &dks.ud;
269 int error;
270 dev_t dev;
271 int otyp;
272 boolean_t validate_devid = B_FALSE;
273 ddi_devid_t devid;
274 uint64_t capacity = 0, blksz = 0, pbsize;
275
276 /*
277 * We must have a pathname, and it must be absolute.
278 */
279 if (vd->vdev_path == NULL || vd->vdev_path[0] != '/') {
280 vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL;
281 return (SET_ERROR(EINVAL));
282 }
283
284 /*
285 * Reopen the device if it's not currently open. Otherwise,
286 * just update the physical size of the device.
287 */
288 if (dvd != NULL) {
289 if (dvd->vd_ldi_offline && dvd->vd_lh == NULL) {
290 /*
291 * If we are opening a device in its offline notify
292 * context, the LDI handle was just closed. Clean
293 * up the LDI event callbacks and free vd->vdev_tsd.
294 */
295 vdev_disk_free(vd);
296 } else {
297 ASSERT(vd->vdev_reopening);
298 goto skip_open;
299 }
300 }
301
302 /*
303 * Create vd->vdev_tsd.
304 */
305 vdev_disk_alloc(vd);
306 dvd = vd->vdev_tsd;
307
308 /*
309 * When opening a disk device, we want to preserve the user's original
310 * intent. We always want to open the device by the path the user gave
311 * us, even if it is one of multiple paths to the same device. But we
312 * also want to be able to survive disks being removed/recabled.
313 * Therefore the sequence of opening devices is:
314 *
315 * 1. Try opening the device by path. For legacy pools without the
316 * 'whole_disk' property, attempt to fix the path by appending 's0'.
317 *
318 * 2. If the devid of the device matches the stored value, return
319 * success.
320 *
321 * 3. Otherwise, the device may have moved. Try opening the device
322 * by the devid instead.
323 */
324 if (vd->vdev_devid != NULL) {
325 if (ddi_devid_str_decode(vd->vdev_devid, &dvd->vd_devid,
326 &dvd->vd_minor) != 0) {
327 vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL;
328 vdev_dbgmsg(vd, "vdev_disk_open: invalid "
329 "vdev_devid '%s'", vd->vdev_devid);
330 return (SET_ERROR(EINVAL));
331 }
332 }
333
334 error = EINVAL; /* presume failure */
335
336 if (vd->vdev_path != NULL) {
337
338 if (vd->vdev_wholedisk == -1ULL) {
339 size_t len = strlen(vd->vdev_path) + 3;
340 char *buf = kmem_alloc(len, KM_SLEEP);
341
342 (void) snprintf(buf, len, "%ss0", vd->vdev_path);
343
344 error = ldi_open_by_name(buf, spa_mode(spa), kcred,
345 &dvd->vd_lh, zfs_li);
346 if (error == 0) {
347 spa_strfree(vd->vdev_path);
348 vd->vdev_path = buf;
349 vd->vdev_wholedisk = 1ULL;
350 } else {
351 kmem_free(buf, len);
352 }
353 }
354
355 /*
356 * If we have not yet opened the device, try to open it by the
357 * specified path.
358 */
359 if (error != 0) {
360 error = ldi_open_by_name(vd->vdev_path, spa_mode(spa),
361 kcred, &dvd->vd_lh, zfs_li);
362 }
363
364 /*
365 * Compare the devid to the stored value.
366 */
367 if (error == 0 && vd->vdev_devid != NULL &&
368 ldi_get_devid(dvd->vd_lh, &devid) == 0) {
369 if (ddi_devid_compare(devid, dvd->vd_devid) != 0) {
370 error = SET_ERROR(EINVAL);
371 (void) ldi_close(dvd->vd_lh, spa_mode(spa),
372 kcred);
373 dvd->vd_lh = NULL;
374 }
375 ddi_devid_free(devid);
376 }
377
378 /*
379 * If we succeeded in opening the device, but 'vdev_wholedisk'
380 * is not yet set, then this must be a slice.
381 */
382 if (error == 0 && vd->vdev_wholedisk == -1ULL)
383 vd->vdev_wholedisk = 0;
384 }
385
386 /*
387 * If we were unable to open by path, or the devid check fails, open by
388 * devid instead.
389 */
390 if (error != 0 && vd->vdev_devid != NULL) {
391 error = ldi_open_by_devid(dvd->vd_devid, dvd->vd_minor,
392 spa_mode(spa), kcred, &dvd->vd_lh, zfs_li);
393 }
394
395 /*
396 * If all else fails, then try opening by physical path (if available)
397 * or the logical path (if we failed due to the devid check). While not
398 * as reliable as the devid, this will give us something, and the higher
399 * level vdev validation will prevent us from opening the wrong device.
400 */
401 if (error) {
402 if (vd->vdev_devid != NULL)
403 validate_devid = B_TRUE;
404
405 if (vd->vdev_physpath != NULL &&
406 (dev = ddi_pathname_to_dev_t(vd->vdev_physpath)) != NODEV)
407 error = ldi_open_by_dev(&dev, OTYP_BLK, spa_mode(spa),
408 kcred, &dvd->vd_lh, zfs_li);
409
410 /*
411 * Note that we don't support the legacy auto-wholedisk support
412 * as above. This hasn't been used in a very long time and we
413 * don't need to propagate its oddities to this edge condition.
414 */
415 if (error && vd->vdev_path != NULL)
416 error = ldi_open_by_name(vd->vdev_path, spa_mode(spa),
417 kcred, &dvd->vd_lh, zfs_li);
418 }
419
420 if (error) {
421 vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED;
422 vdev_dbgmsg(vd, "vdev_disk_open: failed to open [error=%d]",
423 error);
424 return (error);
425 }
426
427 /*
428 * Now that the device has been successfully opened, update the devid
429 * if necessary.
430 */
431 if (validate_devid && spa_writeable(spa) &&
432 ldi_get_devid(dvd->vd_lh, &devid) == 0) {
433 if (ddi_devid_compare(devid, dvd->vd_devid) != 0) {
434 char *vd_devid;
435
436 vd_devid = ddi_devid_str_encode(devid, dvd->vd_minor);
437 vdev_dbgmsg(vd, "vdev_disk_open: update devid from "
438 "'%s' to '%s'", vd->vdev_devid, vd_devid);
439 spa_strfree(vd->vdev_devid);
440 vd->vdev_devid = spa_strdup(vd_devid);
441 ddi_devid_str_free(vd_devid);
442 }
443 ddi_devid_free(devid);
444 }
445
446 /*
447 * Once a device is opened, verify that the physical device path (if
448 * available) is up to date.
449 */
450 if (ldi_get_dev(dvd->vd_lh, &dev) == 0 &&
451 ldi_get_otyp(dvd->vd_lh, &otyp) == 0) {
452 char *physpath, *minorname;
453
454 physpath = kmem_alloc(MAXPATHLEN, KM_SLEEP);
455 minorname = NULL;
456 if (ddi_dev_pathname(dev, otyp, physpath) == 0 &&
457 ldi_get_minor_name(dvd->vd_lh, &minorname) == 0 &&
458 (vd->vdev_physpath == NULL ||
459 strcmp(vd->vdev_physpath, physpath) != 0)) {
460 if (vd->vdev_physpath)
461 spa_strfree(vd->vdev_physpath);
462 (void) strlcat(physpath, ":", MAXPATHLEN);
463 (void) strlcat(physpath, minorname, MAXPATHLEN);
464 vd->vdev_physpath = spa_strdup(physpath);
465 }
466 if (minorname)
467 kmem_free(minorname, strlen(minorname) + 1);
468 kmem_free(physpath, MAXPATHLEN);
469 }
470
471 /*
472 * Register callbacks for the LDI offline event.
473 */
474 if (ldi_ev_get_cookie(dvd->vd_lh, LDI_EV_OFFLINE, &ecookie) ==
475 LDI_EV_SUCCESS) {
476 lcb = kmem_zalloc(sizeof (vdev_disk_ldi_cb_t), KM_SLEEP);
477 list_insert_tail(&dvd->vd_ldi_cbs, lcb);
478 (void) ldi_ev_register_callbacks(dvd->vd_lh, ecookie,
479 &vdev_disk_off_callb, (void *) vd, &lcb->lcb_id);
480 }
481
482 /*
483 * Register callbacks for the LDI degrade event.
484 */
485 if (ldi_ev_get_cookie(dvd->vd_lh, LDI_EV_DEGRADE, &ecookie) ==
486 LDI_EV_SUCCESS) {
487 lcb = kmem_zalloc(sizeof (vdev_disk_ldi_cb_t), KM_SLEEP);
488 list_insert_tail(&dvd->vd_ldi_cbs, lcb);
489 (void) ldi_ev_register_callbacks(dvd->vd_lh, ecookie,
490 &vdev_disk_dgrd_callb, (void *) vd, &lcb->lcb_id);
491 }
492 skip_open:
493 /*
494 * Determine the actual size of the device.
495 */
496 if (ldi_get_size(dvd->vd_lh, psize) != 0) {
497 vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED;
498 vdev_dbgmsg(vd, "vdev_disk_open: failed to get size");
499 return (SET_ERROR(EINVAL));
500 }
501
502 *max_psize = *psize;
503
504 /*
505 * Determine the device's minimum transfer size.
506 * If the ioctl isn't supported, assume DEV_BSIZE.
507 */
508 if ((error = ldi_ioctl(dvd->vd_lh, DKIOCGMEDIAINFOEXT,
509 (intptr_t)dkmext, FKIOCTL, kcred, NULL)) == 0) {
510 capacity = dkmext->dki_capacity - 1;
511 blksz = dkmext->dki_lbsize;
512 pbsize = dkmext->dki_pbsize;
513 } else if ((error = ldi_ioctl(dvd->vd_lh, DKIOCGMEDIAINFO,
514 (intptr_t)dkm, FKIOCTL, kcred, NULL)) == 0) {
515 VDEV_DEBUG(
516 "vdev_disk_open(\"%s\"): fallback to DKIOCGMEDIAINFO\n",
517 vd->vdev_path);
518 capacity = dkm->dki_capacity - 1;
519 blksz = dkm->dki_lbsize;
520 pbsize = blksz;
521 } else {
522 VDEV_DEBUG("vdev_disk_open(\"%s\"): "
523 "both DKIOCGMEDIAINFO{,EXT} calls failed, %d\n",
524 vd->vdev_path, error);
525 pbsize = DEV_BSIZE;
526 }
527
528 *ashift = highbit64(MAX(pbsize, SPA_MINBLOCKSIZE)) - 1;
529
530 if (vd->vdev_wholedisk == 1) {
531 int wce = 1;
532
533 if (error == 0) {
534 /*
535 * If we have the capability to expand, we'd have
536 * found out via success from DKIOCGMEDIAINFO{,EXT}.
537 * Adjust max_psize upward accordingly since we know
538 * we own the whole disk now.
539 */
540 *max_psize = capacity * blksz;
541 }
542
543 /*
544 * Since we own the whole disk, try to enable disk write
545 * caching. We ignore errors because it's OK if we can't do it.
546 */
547 (void) ldi_ioctl(dvd->vd_lh, DKIOCSETWCE, (intptr_t)&wce,
548 FKIOCTL, kcred, NULL);
549 }
550
551 /*
552 * Clear the nowritecache bit, so that on a vdev_reopen() we will
553 * try again.
554 */
555 vd->vdev_nowritecache = B_FALSE;
556
557 return (0);
558 }
559
560 static void
561 vdev_disk_close(vdev_t *vd)
562 {
563 vdev_disk_t *dvd = vd->vdev_tsd;
564
565 if (vd->vdev_reopening || dvd == NULL)
566 return;
567
568 if (dvd->vd_minor != NULL) {
569 ddi_devid_str_free(dvd->vd_minor);
570 dvd->vd_minor = NULL;
571 }
572
573 if (dvd->vd_devid != NULL) {
574 ddi_devid_free(dvd->vd_devid);
575 dvd->vd_devid = NULL;
576 }
577
578 if (dvd->vd_lh != NULL) {
579 (void) ldi_close(dvd->vd_lh, spa_mode(vd->vdev_spa), kcred);
580 dvd->vd_lh = NULL;
581 }
582
583 vd->vdev_delayed_close = B_FALSE;
584 /*
585 * If we closed the LDI handle due to an offline notify from LDI,
586 * don't free vd->vdev_tsd or unregister the callbacks here;
587 * the offline finalize callback or a reopen will take care of it.
588 */
589 if (dvd->vd_ldi_offline)
590 return;
591
592 vdev_disk_free(vd);
593 }
594
595 int
596 vdev_disk_physio(vdev_t *vd, caddr_t data,
597 size_t size, uint64_t offset, int flags, boolean_t isdump)
598 {
599 vdev_disk_t *dvd = vd->vdev_tsd;
600
601 /*
602 * If the vdev is closed, it's likely in the REMOVED or FAULTED state.
603 * Nothing to be done here but return failure.
604 */
605 if (dvd == NULL || (dvd->vd_ldi_offline && dvd->vd_lh == NULL))
606 return (EIO);
607
608 ASSERT(vd->vdev_ops == &vdev_disk_ops);
609
610 /*
611 * If in the context of an active crash dump, use the ldi_dump(9F)
612 * call instead of ldi_strategy(9F) as usual.
613 */
614 if (isdump) {
615 ASSERT3P(dvd, !=, NULL);
616 return (ldi_dump(dvd->vd_lh, data, lbtodb(offset),
617 lbtodb(size)));
618 }
619
620 return (vdev_disk_ldi_physio(dvd->vd_lh, data, size, offset, flags));
621 }
622
623 int
624 vdev_disk_ldi_physio(ldi_handle_t vd_lh, caddr_t data,
625 size_t size, uint64_t offset, int flags)
626 {
627 buf_t *bp;
628 int error = 0;
629
630 if (vd_lh == NULL)
631 return (SET_ERROR(EINVAL));
632
633 ASSERT(flags & B_READ || flags & B_WRITE);
634
635 bp = getrbuf(KM_SLEEP);
636 bp->b_flags = flags | B_BUSY | B_NOCACHE | B_FAILFAST;
637 bp->b_bcount = size;
638 bp->b_un.b_addr = (void *)data;
639 bp->b_lblkno = lbtodb(offset);
640 bp->b_bufsize = size;
641
642 error = ldi_strategy(vd_lh, bp);
643 ASSERT(error == 0);
644 if ((error = biowait(bp)) == 0 && bp->b_resid != 0)
645 error = SET_ERROR(EIO);
646 freerbuf(bp);
647
648 return (error);
649 }
650
651 static void
652 vdev_disk_io_intr(buf_t *bp)
653 {
654 vdev_buf_t *vb = (vdev_buf_t *)bp;
655 zio_t *zio = vb->vb_io;
656
657 /*
658 * The rest of the zio stack only deals with EIO, ECKSUM, and ENXIO.
659 * Rather than teach the rest of the stack about other error
660 * possibilities (EFAULT, etc), we normalize the error value here.
661 */
662 zio->io_error = (geterror(bp) != 0 ? EIO : 0);
663
664 if (zio->io_error == 0 && bp->b_resid != 0)
665 zio->io_error = SET_ERROR(EIO);
666
667 if (zio->io_type == ZIO_TYPE_READ) {
668 abd_return_buf_copy(zio->io_abd, bp->b_un.b_addr, zio->io_size);
669 } else {
670 abd_return_buf(zio->io_abd, bp->b_un.b_addr, zio->io_size);
671 }
672
673 kmem_free(vb, sizeof (vdev_buf_t));
674
675 zio_delay_interrupt(zio);
676 }
677
678 static void
679 vdev_disk_ioctl_free(zio_t *zio)
680 {
681 kmem_free(zio->io_vsd, sizeof (struct dk_callback));
682 }
683
684 static const zio_vsd_ops_t vdev_disk_vsd_ops = {
685 vdev_disk_ioctl_free,
686 zio_vsd_default_cksum_report
687 };
688
689 static void
690 vdev_disk_ioctl_done(void *zio_arg, int error)
691 {
692 zio_t *zio = zio_arg;
693
694 zio->io_error = error;
695
696 zio_interrupt(zio);
697 }
698
699 static void
700 vdev_disk_io_start(zio_t *zio)
701 {
702 vdev_t *vd = zio->io_vd;
703 vdev_disk_t *dvd = vd->vdev_tsd;
704 vdev_buf_t *vb;
705 struct dk_callback *dkc;
706 buf_t *bp;
707 int error;
708
709 /*
710 * If the vdev is closed, it's likely in the REMOVED or FAULTED state.
711 * Nothing to be done here but return failure.
712 */
713 if (dvd == NULL || (dvd->vd_ldi_offline && dvd->vd_lh == NULL)) {
714 zio->io_error = ENXIO;
715 zio_interrupt(zio);
716 return;
717 }
718
719 if (zio->io_type == ZIO_TYPE_IOCTL) {
720 /* XXPOLICY */
721 if (!vdev_readable(vd)) {
722 zio->io_error = SET_ERROR(ENXIO);
723 zio_interrupt(zio);
724 return;
725 }
726
727 switch (zio->io_cmd) {
728
729 case DKIOCFLUSHWRITECACHE:
730
731 if (zfs_nocacheflush)
732 break;
733
734 if (vd->vdev_nowritecache) {
735 zio->io_error = SET_ERROR(ENOTSUP);
736 break;
737 }
738
739 zio->io_vsd = dkc = kmem_alloc(sizeof (*dkc), KM_SLEEP);
740 zio->io_vsd_ops = &vdev_disk_vsd_ops;
741
742 dkc->dkc_callback = vdev_disk_ioctl_done;
743 dkc->dkc_flag = FLUSH_VOLATILE;
744 dkc->dkc_cookie = zio;
745
746 error = ldi_ioctl(dvd->vd_lh, zio->io_cmd,
747 (uintptr_t)dkc, FKIOCTL, kcred, NULL);
748
749 if (error == 0) {
750 /*
751 * The ioctl will be done asychronously,
752 * and will call vdev_disk_ioctl_done()
753 * upon completion.
754 */
755 return;
756 }
757
758 zio->io_error = error;
759
760 break;
761
762 default:
763 zio->io_error = SET_ERROR(ENOTSUP);
764 }
765
766 zio_execute(zio);
767 return;
768 }
769
770 ASSERT(zio->io_type == ZIO_TYPE_READ || zio->io_type == ZIO_TYPE_WRITE);
771 zio->io_target_timestamp = zio_handle_io_delay(zio);
772
773 vb = kmem_alloc(sizeof (vdev_buf_t), KM_SLEEP);
774
775 vb->vb_io = zio;
776 bp = &vb->vb_buf;
777
778 bioinit(bp);
779 bp->b_flags = B_BUSY | B_NOCACHE |
780 (zio->io_type == ZIO_TYPE_READ ? B_READ : B_WRITE);
781 if (!(zio->io_flags & (ZIO_FLAG_IO_RETRY | ZIO_FLAG_TRYHARD)))
782 bp->b_flags |= B_FAILFAST;
783 bp->b_bcount = zio->io_size;
784
785 if (zio->io_type == ZIO_TYPE_READ) {
786 bp->b_un.b_addr =
787 abd_borrow_buf(zio->io_abd, zio->io_size);
788 } else {
789 bp->b_un.b_addr =
790 abd_borrow_buf_copy(zio->io_abd, zio->io_size);
791 }
792
793 bp->b_lblkno = lbtodb(zio->io_offset);
794 bp->b_bufsize = zio->io_size;
795 bp->b_iodone = (int (*)())vdev_disk_io_intr;
796
797 /* ldi_strategy() will return non-zero only on programming errors */
798 VERIFY(ldi_strategy(dvd->vd_lh, bp) == 0);
799 }
800
801 static void
802 vdev_disk_io_done(zio_t *zio)
803 {
804 vdev_t *vd = zio->io_vd;
805
806 /*
807 * If the device returned EIO, then attempt a DKIOCSTATE ioctl to see if
808 * the device has been removed. If this is the case, then we trigger an
809 * asynchronous removal of the device. Otherwise, probe the device and
810 * make sure it's still accessible.
811 */
812 if (zio->io_error == EIO && !vd->vdev_remove_wanted) {
813 vdev_disk_t *dvd = vd->vdev_tsd;
814 int state = DKIO_NONE;
815
816 if (ldi_ioctl(dvd->vd_lh, DKIOCSTATE, (intptr_t)&state,
817 FKIOCTL, kcred, NULL) == 0 && state != DKIO_INSERTED) {
818 /*
819 * We post the resource as soon as possible, instead of
820 * when the async removal actually happens, because the
821 * DE is using this information to discard previous I/O
822 * errors.
823 */
824 zfs_post_remove(zio->io_spa, vd);
825 vd->vdev_remove_wanted = B_TRUE;
826 spa_async_request(zio->io_spa, SPA_ASYNC_REMOVE);
827 } else if (!vd->vdev_delayed_close) {
828 vd->vdev_delayed_close = B_TRUE;
829 }
830 }
831 }
832
833 vdev_ops_t vdev_disk_ops = {
834 vdev_disk_open,
835 vdev_disk_close,
836 vdev_default_asize,
837 vdev_disk_io_start,
838 vdev_disk_io_done,
839 NULL,
840 vdev_disk_hold,
841 vdev_disk_rele,
842 NULL,
843 VDEV_TYPE_DISK, /* name of this vdev type */
844 B_TRUE /* leaf vdev */
845 };
846
847 /*
848 * Given the root disk device devid or pathname, read the label from
849 * the device, and construct a configuration nvlist.
850 */
851 int
852 vdev_disk_read_rootlabel(char *devpath, char *devid, nvlist_t **config)
853 {
854 ldi_handle_t vd_lh;
855 vdev_label_t *label;
856 uint64_t s, size;
857 int l;
858 ddi_devid_t tmpdevid;
859 int error = -1;
860 char *minor_name;
861
862 /*
863 * Read the device label and build the nvlist.
864 */
865 if (devid != NULL && ddi_devid_str_decode(devid, &tmpdevid,
866 &minor_name) == 0) {
867 error = ldi_open_by_devid(tmpdevid, minor_name,
868 FREAD, kcred, &vd_lh, zfs_li);
869 ddi_devid_free(tmpdevid);
870 ddi_devid_str_free(minor_name);
871 }
872
873 if (error && (error = ldi_open_by_name(devpath, FREAD, kcred, &vd_lh,
874 zfs_li)))
875 return (error);
876
877 if (ldi_get_size(vd_lh, &s)) {
878 (void) ldi_close(vd_lh, FREAD, kcred);
879 return (SET_ERROR(EIO));
880 }
881
882 size = P2ALIGN_TYPED(s, sizeof (vdev_label_t), uint64_t);
883 label = kmem_alloc(sizeof (vdev_label_t), KM_SLEEP);
884
885 *config = NULL;
886 for (l = 0; l < VDEV_LABELS; l++) {
887 uint64_t offset, state, txg = 0;
888
889 /* read vdev label */
890 offset = vdev_label_offset(size, l, 0);
891 if (vdev_disk_ldi_physio(vd_lh, (caddr_t)label,
892 VDEV_SKIP_SIZE + VDEV_PHYS_SIZE, offset, B_READ) != 0)
893 continue;
894
895 if (nvlist_unpack(label->vl_vdev_phys.vp_nvlist,
896 sizeof (label->vl_vdev_phys.vp_nvlist), config, 0) != 0) {
897 *config = NULL;
898 continue;
899 }
900
901 if (nvlist_lookup_uint64(*config, ZPOOL_CONFIG_POOL_STATE,
902 &state) != 0 || state >= POOL_STATE_DESTROYED) {
903 nvlist_free(*config);
904 *config = NULL;
905 continue;
906 }
907
908 if (nvlist_lookup_uint64(*config, ZPOOL_CONFIG_POOL_TXG,
909 &txg) != 0 || txg == 0) {
910 nvlist_free(*config);
911 *config = NULL;
912 continue;
913 }
914
915 break;
916 }
917
918 kmem_free(label, sizeof (vdev_label_t));
919 (void) ldi_close(vd_lh, FREAD, kcred);
920 if (*config == NULL)
921 error = SET_ERROR(EIDRM);
922
923 return (error);
924 }