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 }