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 by Delphix. All rights reserved.
24 * Copyright (c) 2012, Joyent, Inc. All rights reserved.
25 * Copyright 2012 Nexenta Systems, Inc. All rights reserved.
26 */
27
28 #include <sys/zfs_context.h>
29 #include <sys/zfs_zone.h>
30 #include <sys/spa_impl.h>
31 #include <sys/refcount.h>
32 #include <sys/vdev_disk.h>
33 #include <sys/vdev_impl.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_buf {
49 buf_t vdb_buf;
50 zio_t *vdb_io;
51 } vdev_disk_buf_t;
52
53 typedef struct vdev_disk_ldi_cb {
54 list_node_t lcb_next;
55 ldi_callback_id_t lcb_id;
56 } vdev_disk_ldi_cb_t;
57
58 static void vdev_disk_alloc(vdev_t *vd)
59 {
60 vdev_disk_t *dvd;
61
62 dvd = vd->vdev_tsd = kmem_zalloc(sizeof (vdev_disk_t), KM_SLEEP);
63 /*
64 * Create the LDI event callback list.
65 */
66 list_create(&dvd->vd_ldi_cbs, sizeof (vdev_disk_ldi_cb_t),
67 offsetof(vdev_disk_ldi_cb_t, lcb_next));
68 }
69
70 static void vdev_disk_free(vdev_t *vd)
71 {
72 vdev_disk_t *dvd = vd->vdev_tsd;
73 vdev_disk_ldi_cb_t *lcb;
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 vdev_disk_t *dvd = vd->vdev_tsd;
132 vdev_disk_ldi_cb_t *lcb;
133
134 /*
135 * Ignore events other than offline.
136 */
137 if (strcmp(ldi_ev_get_type(ecookie), LDI_EV_OFFLINE) != 0)
138 return;
139
140 /*
141 * We have already closed the LDI handle in notify.
142 * Clean up the LDI event callbacks and free vd->vdev_tsd.
143 */
144 vdev_disk_free(vd);
145
146 /*
147 * Request that the vdev be reopened if the offline state change was
148 * unsuccessful.
149 */
150 if (ldi_result != LDI_EV_SUCCESS) {
151 vd->vdev_probe_wanted = B_TRUE;
152 spa_async_request(vd->vdev_spa, SPA_ASYNC_PROBE);
153 }
154 }
155
156 static ldi_ev_callback_t vdev_disk_off_callb = {
157 .cb_vers = LDI_EV_CB_VERS,
158 .cb_notify = vdev_disk_off_notify,
159 .cb_finalize = vdev_disk_off_finalize
160 };
161
162 /* ARGSUSED */
163 static void
164 vdev_disk_dgrd_finalize(ldi_handle_t lh, ldi_ev_cookie_t ecookie,
165 int ldi_result, void *arg, void *ev_data)
166 {
167 vdev_t *vd = (vdev_t *)arg;
168
169 /*
170 * Ignore events other than degrade.
171 */
172 if (strcmp(ldi_ev_get_type(ecookie), LDI_EV_DEGRADE) != 0)
173 return;
174
175 /*
176 * Degrade events always succeed. Mark the vdev as degraded.
177 * This status is purely informative for the user.
178 */
179 (void) vdev_degrade(vd->vdev_spa, vd->vdev_guid, 0);
180 }
181
182 static ldi_ev_callback_t vdev_disk_dgrd_callb = {
183 .cb_vers = LDI_EV_CB_VERS,
184 .cb_notify = NULL,
185 .cb_finalize = vdev_disk_dgrd_finalize
186 };
187
188 static void
189 vdev_disk_hold(vdev_t *vd)
190 {
191 ddi_devid_t devid;
192 char *minor;
193
194 ASSERT(spa_config_held(vd->vdev_spa, SCL_STATE, RW_WRITER));
195
196 /*
197 * We must have a pathname, and it must be absolute.
198 */
199 if (vd->vdev_path == NULL || vd->vdev_path[0] != '/')
200 return;
201
202 /*
203 * Only prefetch path and devid info if the device has
204 * never been opened.
205 */
206 if (vd->vdev_tsd != NULL)
207 return;
208
209 if (vd->vdev_wholedisk == -1ULL) {
210 size_t len = strlen(vd->vdev_path) + 3;
211 char *buf = kmem_alloc(len, KM_SLEEP);
212
213 (void) snprintf(buf, len, "%ss0", vd->vdev_path);
214
215 (void) ldi_vp_from_name(buf, &vd->vdev_name_vp);
216 kmem_free(buf, len);
217 }
218
219 if (vd->vdev_name_vp == NULL)
220 (void) ldi_vp_from_name(vd->vdev_path, &vd->vdev_name_vp);
221
222 if (vd->vdev_devid != NULL &&
223 ddi_devid_str_decode(vd->vdev_devid, &devid, &minor) == 0) {
224 (void) ldi_vp_from_devid(devid, minor, &vd->vdev_devid_vp);
225 ddi_devid_str_free(minor);
226 ddi_devid_free(devid);
227 }
228 }
229
230 static void
231 vdev_disk_rele(vdev_t *vd)
232 {
233 ASSERT(spa_config_held(vd->vdev_spa, SCL_STATE, RW_WRITER));
234
235 if (vd->vdev_name_vp) {
236 VN_RELE_ASYNC(vd->vdev_name_vp,
237 dsl_pool_vnrele_taskq(vd->vdev_spa->spa_dsl_pool));
238 vd->vdev_name_vp = NULL;
239 }
240 if (vd->vdev_devid_vp) {
241 VN_RELE_ASYNC(vd->vdev_devid_vp,
242 dsl_pool_vnrele_taskq(vd->vdev_spa->spa_dsl_pool));
243 vd->vdev_devid_vp = NULL;
244 }
245 }
246
247 static uint64_t
248 vdev_disk_get_space(vdev_t *vd, uint64_t capacity, uint_t blksz)
249 {
250 ASSERT(vd->vdev_wholedisk);
251
252 vdev_disk_t *dvd = vd->vdev_tsd;
253 dk_efi_t dk_ioc;
254 efi_gpt_t *efi;
255 uint64_t avail_space = 0;
256 int efisize = EFI_LABEL_SIZE * 2;
257
258 dk_ioc.dki_data = kmem_alloc(efisize, KM_SLEEP);
259 dk_ioc.dki_lba = 1;
260 dk_ioc.dki_length = efisize;
261 dk_ioc.dki_data_64 = (uint64_t)(uintptr_t)dk_ioc.dki_data;
262 efi = dk_ioc.dki_data;
263
264 if (ldi_ioctl(dvd->vd_lh, DKIOCGETEFI, (intptr_t)&dk_ioc,
265 FKIOCTL, kcred, NULL) == 0) {
266 uint64_t efi_altern_lba = LE_64(efi->efi_gpt_AlternateLBA);
267
268 zfs_dbgmsg("vdev %s, capacity %llu, altern lba %llu",
269 vd->vdev_path, capacity, efi_altern_lba);
270 if (capacity > efi_altern_lba)
271 avail_space = (capacity - efi_altern_lba) * blksz;
272 }
273 kmem_free(dk_ioc.dki_data, efisize);
274 return (avail_space);
275 }
276
277 static int
278 vdev_disk_open(vdev_t *vd, uint64_t *psize, uint64_t *max_psize,
279 uint64_t *ashift)
280 {
281 spa_t *spa = vd->vdev_spa;
282 vdev_disk_t *dvd = vd->vdev_tsd;
283 struct dk_minfo_ext dkmext;
284 ldi_ev_cookie_t ecookie;
285 vdev_disk_ldi_cb_t *lcb;
286 int error;
287 dev_t dev;
288 int otyp;
289
290 /*
291 * We must have a pathname, and it must be absolute.
292 */
293 if (vd->vdev_path == NULL || vd->vdev_path[0] != '/') {
294 vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL;
295 return (EINVAL);
296 }
297
298 /*
299 * Reopen the device if it's not currently open. Otherwise,
300 * just update the physical size of the device.
301 */
302 if (dvd != NULL) {
303 if (dvd->vd_ldi_offline && dvd->vd_lh == NULL) {
304 /*
305 * If we are opening a device in its offline notify
306 * context, the LDI handle was just closed. Clean
307 * up the LDI event callbacks and free vd->vdev_tsd.
308 */
309 vdev_disk_free(vd);
310 } else {
311 VERIFY(vd->vdev_reopening);
312 goto skip_open;
313 }
314 }
315
316 /*
317 * Create vd->vdev_tsd.
318 */
319 vdev_disk_alloc(vd);
320 dvd = vd->vdev_tsd;
321
322 /*
323 * When opening a disk device, we want to preserve the user's original
324 * intent. We always want to open the device by the path the user gave
325 * us, even if it is one of multiple paths to the save device. But we
326 * also want to be able to survive disks being removed/recabled.
327 * Therefore the sequence of opening devices is:
328 *
329 * 1. Try opening the device by path. For legacy pools without the
330 * 'whole_disk' property, attempt to fix the path by appending 's0'.
331 *
332 * 2. If the devid of the device matches the stored value, return
333 * success.
334 *
335 * 3. Otherwise, the device may have moved. Try opening the device
336 * by the devid instead.
337 */
338 if (vd->vdev_devid != NULL) {
339 if (ddi_devid_str_decode(vd->vdev_devid, &dvd->vd_devid,
340 &dvd->vd_minor) != 0) {
341 vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL;
342 return (EINVAL);
343 }
344 }
345
346 error = EINVAL; /* presume failure */
347
348 if (vd->vdev_path != NULL) {
349 ddi_devid_t devid;
350
351 if (vd->vdev_wholedisk == -1ULL) {
352 size_t len = strlen(vd->vdev_path) + 3;
353 char *buf = kmem_alloc(len, KM_SLEEP);
354
355 (void) snprintf(buf, len, "%ss0", vd->vdev_path);
356
357 error = ldi_open_by_name(buf, spa_mode(spa), kcred,
358 &dvd->vd_lh, zfs_li);
359 if (error == 0) {
360 spa_strfree(vd->vdev_path);
361 vd->vdev_path = buf;
362 vd->vdev_wholedisk = 1ULL;
363 } else {
364 kmem_free(buf, len);
365 }
366 }
367
368 /*
369 * If we have not yet opened the device, try to open it by the
370 * specified path.
371 */
372 if (error != 0) {
373 error = ldi_open_by_name(vd->vdev_path, spa_mode(spa),
374 kcred, &dvd->vd_lh, zfs_li);
375 }
376
377 /*
378 * Compare the devid to the stored value.
379 */
380 if (error == 0 && vd->vdev_devid != NULL &&
381 ldi_get_devid(dvd->vd_lh, &devid) == 0) {
382 if (ddi_devid_compare(devid, dvd->vd_devid) != 0) {
383 error = EINVAL;
384 (void) ldi_close(dvd->vd_lh, spa_mode(spa),
385 kcred);
386 dvd->vd_lh = NULL;
387 }
388 ddi_devid_free(devid);
389 }
390
391 /*
392 * If we succeeded in opening the device, but 'vdev_wholedisk'
393 * is not yet set, then this must be a slice.
394 */
395 if (error == 0 && vd->vdev_wholedisk == -1ULL)
396 vd->vdev_wholedisk = 0;
397 }
398
399 /*
400 * If we were unable to open by path, or the devid check fails, open by
401 * devid instead.
402 */
403 if (error != 0 && vd->vdev_devid != NULL)
404 error = ldi_open_by_devid(dvd->vd_devid, dvd->vd_minor,
405 spa_mode(spa), kcred, &dvd->vd_lh, zfs_li);
406
407 /*
408 * If all else fails, then try opening by physical path (if available)
409 * or the logical path (if we failed due to the devid check). While not
410 * as reliable as the devid, this will give us something, and the higher
411 * level vdev validation will prevent us from opening the wrong device.
412 */
413 if (error) {
414 if (vd->vdev_physpath != NULL &&
415 (dev = ddi_pathname_to_dev_t(vd->vdev_physpath)) != NODEV)
416 error = ldi_open_by_dev(&dev, OTYP_BLK, spa_mode(spa),
417 kcred, &dvd->vd_lh, zfs_li);
418
419 /*
420 * Note that we don't support the legacy auto-wholedisk support
421 * as above. This hasn't been used in a very long time and we
422 * don't need to propagate its oddities to this edge condition.
423 */
424 if (error && vd->vdev_path != NULL)
425 error = ldi_open_by_name(vd->vdev_path, spa_mode(spa),
426 kcred, &dvd->vd_lh, zfs_li);
427 }
428
429 if (error) {
430 vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED;
431 return (error);
432 }
433
434 /*
435 * Once a device is opened, verify that the physical device path (if
436 * available) is up to date.
437 */
438 if (ldi_get_dev(dvd->vd_lh, &dev) == 0 &&
439 ldi_get_otyp(dvd->vd_lh, &otyp) == 0) {
440 char *physpath, *minorname;
441
442 physpath = kmem_alloc(MAXPATHLEN, KM_SLEEP);
443 minorname = NULL;
444 if (ddi_dev_pathname(dev, otyp, physpath) == 0 &&
445 ldi_get_minor_name(dvd->vd_lh, &minorname) == 0 &&
446 (vd->vdev_physpath == NULL ||
447 strcmp(vd->vdev_physpath, physpath) != 0)) {
448 if (vd->vdev_physpath)
449 spa_strfree(vd->vdev_physpath);
450 (void) strlcat(physpath, ":", MAXPATHLEN);
451 (void) strlcat(physpath, minorname, MAXPATHLEN);
452 vd->vdev_physpath = spa_strdup(physpath);
453 }
454 if (minorname)
455 kmem_free(minorname, strlen(minorname) + 1);
456 kmem_free(physpath, MAXPATHLEN);
457 }
458
459 /*
460 * Register callbacks for the LDI offline event.
461 */
462 if (ldi_ev_get_cookie(dvd->vd_lh, LDI_EV_OFFLINE, &ecookie) ==
463 LDI_EV_SUCCESS) {
464 lcb = kmem_zalloc(sizeof (vdev_disk_ldi_cb_t), KM_SLEEP);
465 list_insert_tail(&dvd->vd_ldi_cbs, lcb);
466 (void) ldi_ev_register_callbacks(dvd->vd_lh, ecookie,
467 &vdev_disk_off_callb, (void *) vd, &lcb->lcb_id);
468 }
469
470 /*
471 * Register callbacks for the LDI degrade event.
472 */
473 if (ldi_ev_get_cookie(dvd->vd_lh, LDI_EV_DEGRADE, &ecookie) ==
474 LDI_EV_SUCCESS) {
475 lcb = kmem_zalloc(sizeof (vdev_disk_ldi_cb_t), KM_SLEEP);
476 list_insert_tail(&dvd->vd_ldi_cbs, lcb);
477 (void) ldi_ev_register_callbacks(dvd->vd_lh, ecookie,
478 &vdev_disk_dgrd_callb, (void *) vd, &lcb->lcb_id);
479 }
480 skip_open:
481 /*
482 * Determine the actual size of the device.
483 */
484 if (ldi_get_size(dvd->vd_lh, psize) != 0) {
485 vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED;
486 return (EINVAL);
487 }
488
489 /*
490 * Determine the device's minimum transfer size.
491 * If the ioctl isn't supported, assume DEV_BSIZE.
492 */
493 if (ldi_ioctl(dvd->vd_lh, DKIOCGMEDIAINFOEXT, (intptr_t)&dkmext,
494 FKIOCTL, kcred, NULL) != 0)
495 dkmext.dki_pbsize = DEV_BSIZE;
496
497 *ashift = highbit(MAX(dkmext.dki_pbsize, SPA_MINBLOCKSIZE)) - 1;
498
499 if (vd->vdev_wholedisk == 1) {
500 uint64_t capacity = dkmext.dki_capacity - 1;
501 uint64_t blksz = dkmext.dki_lbsize;
502 int wce = 1;
503
504 /*
505 * If we own the whole disk, try to enable disk write caching.
506 * We ignore errors because it's OK if we can't do it.
507 */
508 (void) ldi_ioctl(dvd->vd_lh, DKIOCSETWCE, (intptr_t)&wce,
509 FKIOCTL, kcred, NULL);
510
511 *max_psize = *psize + vdev_disk_get_space(vd, capacity, blksz);
512 zfs_dbgmsg("capacity change: vdev %s, psize %llu, "
513 "max_psize %llu", vd->vdev_path, *psize, *max_psize);
514 } else {
515 *max_psize = *psize;
516 }
517
518 /*
519 * Clear the nowritecache bit, so that on a vdev_reopen() we will
520 * try again.
521 */
522 vd->vdev_nowritecache = B_FALSE;
523
524 return (0);
525 }
526
527 static void
528 vdev_disk_close(vdev_t *vd)
529 {
530 vdev_disk_t *dvd = vd->vdev_tsd;
531 vdev_disk_ldi_cb_t *lcb;
532
533 if (vd->vdev_reopening || dvd == NULL)
534 return;
535
536 if (dvd->vd_minor != NULL) {
537 ddi_devid_str_free(dvd->vd_minor);
538 dvd->vd_minor = NULL;
539 }
540
541 if (dvd->vd_devid != NULL) {
542 ddi_devid_free(dvd->vd_devid);
543 dvd->vd_devid = NULL;
544 }
545
546 if (dvd->vd_lh != NULL) {
547 (void) ldi_close(dvd->vd_lh, spa_mode(vd->vdev_spa), kcred);
548 dvd->vd_lh = NULL;
549 }
550
551 vd->vdev_delayed_close = B_FALSE;
552 /*
553 * If we closed the LDI handle due to an offline notify from LDI,
554 * don't free vd->vdev_tsd or unregister the callbacks here;
555 * the offline finalize callback or a reopen will take care of it.
556 */
557 if (dvd->vd_ldi_offline)
558 return;
559
560 vdev_disk_free(vd);
561 }
562
563 int
564 vdev_disk_physio(vdev_t *vd, caddr_t data,
565 size_t size, uint64_t offset, int flags)
566 {
567 vdev_disk_t *dvd = vd->vdev_tsd;
568
569 /*
570 * If the vdev is closed, it's likely in the REMOVED or FAULTED state.
571 * Nothing to be done here but return failure.
572 */
573 if (dvd == NULL || (dvd->vd_ldi_offline && dvd->vd_lh == NULL))
574 return (EIO);
575
576 ASSERT(vd->vdev_ops == &vdev_disk_ops);
577 return (vdev_disk_ldi_physio(dvd->vd_lh, data, size, offset, flags));
578 }
579
580 int
581 vdev_disk_ldi_physio(ldi_handle_t vd_lh, caddr_t data,
582 size_t size, uint64_t offset, int flags)
583 {
584 buf_t *bp;
585 int error = 0;
586
587 if (vd_lh == NULL)
588 return (EINVAL);
589
590 ASSERT(flags & B_READ || flags & B_WRITE);
591
592 bp = getrbuf(KM_SLEEP);
593 bp->b_flags = flags | B_BUSY | B_NOCACHE | B_FAILFAST;
594 bp->b_bcount = size;
595 bp->b_un.b_addr = (void *)data;
596 bp->b_lblkno = lbtodb(offset);
597 bp->b_bufsize = size;
598
599 error = ldi_strategy(vd_lh, bp);
600 ASSERT(error == 0);
601 if ((error = biowait(bp)) == 0 && bp->b_resid != 0)
602 error = EIO;
603 freerbuf(bp);
604
605 return (error);
606 }
607
608 static void
609 vdev_disk_io_intr(buf_t *bp)
610 {
611 vdev_disk_buf_t *vdb = (vdev_disk_buf_t *)bp;
612 zio_t *zio = vdb->vdb_io;
613
614 /*
615 * The rest of the zio stack only deals with EIO, ECKSUM, and ENXIO.
616 * Rather than teach the rest of the stack about other error
617 * possibilities (EFAULT, etc), we normalize the error value here.
618 */
619 zio->io_error = (geterror(bp) != 0 ? EIO : 0);
620
621 if (zio->io_error == 0 && bp->b_resid != 0)
622 zio->io_error = EIO;
623
624 kmem_free(vdb, sizeof (vdev_disk_buf_t));
625
626 zio_interrupt(zio);
627 }
628
629 static void
630 vdev_disk_ioctl_free(zio_t *zio)
631 {
632 kmem_free(zio->io_vsd, sizeof (struct dk_callback));
633 }
634
635 static const zio_vsd_ops_t vdev_disk_vsd_ops = {
636 vdev_disk_ioctl_free,
637 zio_vsd_default_cksum_report
638 };
639
640 static void
641 vdev_disk_ioctl_done(void *zio_arg, int error)
642 {
643 zio_t *zio = zio_arg;
644
645 zio->io_error = error;
646
647 zio_interrupt(zio);
648 }
649
650 static int
651 vdev_disk_io_start(zio_t *zio)
652 {
653 vdev_t *vd = zio->io_vd;
654 vdev_disk_t *dvd = vd->vdev_tsd;
655 vdev_disk_buf_t *vdb;
656 struct dk_callback *dkc;
657 buf_t *bp;
658 int error;
659
660 /*
661 * If the vdev is closed, it's likely in the REMOVED or FAULTED state.
662 * Nothing to be done here but return failure.
663 */
664 if (dvd == NULL || (dvd->vd_ldi_offline && dvd->vd_lh == NULL)) {
665 zio->io_error = ENXIO;
666 return (ZIO_PIPELINE_CONTINUE);
667 }
668
669 if (zio->io_type == ZIO_TYPE_IOCTL) {
670 /* XXPOLICY */
671 if (!vdev_readable(vd)) {
672 zio->io_error = ENXIO;
673 return (ZIO_PIPELINE_CONTINUE);
674 }
675
676 switch (zio->io_cmd) {
677
678 case DKIOCFLUSHWRITECACHE:
679
680 if (zfs_nocacheflush)
681 break;
682
683 if (vd->vdev_nowritecache) {
684 zio->io_error = ENOTSUP;
685 break;
686 }
687
688 zio->io_vsd = dkc = kmem_alloc(sizeof (*dkc), KM_SLEEP);
689 zio->io_vsd_ops = &vdev_disk_vsd_ops;
690
691 dkc->dkc_callback = vdev_disk_ioctl_done;
692 dkc->dkc_flag = FLUSH_VOLATILE;
693 dkc->dkc_cookie = zio;
694
695 error = ldi_ioctl(dvd->vd_lh, zio->io_cmd,
696 (uintptr_t)dkc, FKIOCTL, kcred, NULL);
697
698 if (error == 0) {
699 /*
700 * The ioctl will be done asychronously,
701 * and will call vdev_disk_ioctl_done()
702 * upon completion.
703 */
704 return (ZIO_PIPELINE_STOP);
705 }
706
707 if (error == ENOTSUP || error == ENOTTY) {
708 /*
709 * If we get ENOTSUP or ENOTTY, we know that
710 * no future attempts will ever succeed.
711 * In this case we set a persistent bit so
712 * that we don't bother with the ioctl in the
713 * future.
714 */
715 vd->vdev_nowritecache = B_TRUE;
716 }
717 zio->io_error = error;
718
719 break;
720
721 default:
722 zio->io_error = ENOTSUP;
723 }
724
725 return (ZIO_PIPELINE_CONTINUE);
726 }
727
728 vdb = kmem_alloc(sizeof (vdev_disk_buf_t), KM_SLEEP);
729
730 vdb->vdb_io = zio;
731 bp = &vdb->vdb_buf;
732
733 bioinit(bp);
734 bp->b_flags = B_BUSY | B_NOCACHE |
735 (zio->io_type == ZIO_TYPE_READ ? B_READ : B_WRITE);
736 if (!(zio->io_flags & (ZIO_FLAG_IO_RETRY | ZIO_FLAG_TRYHARD)))
737 bp->b_flags |= B_FAILFAST;
738 bp->b_bcount = zio->io_size;
739 bp->b_un.b_addr = zio->io_data;
740 bp->b_lblkno = lbtodb(zio->io_offset);
741 bp->b_bufsize = zio->io_size;
742 bp->b_iodone = (int (*)())vdev_disk_io_intr;
743
744 zfs_zone_zio_start(zio);
745
746 /* ldi_strategy() will return non-zero only on programming errors */
747 VERIFY(ldi_strategy(dvd->vd_lh, bp) == 0);
748
749 return (ZIO_PIPELINE_STOP);
750 }
751
752 static void
753 vdev_disk_io_done(zio_t *zio)
754 {
755 vdev_t *vd = zio->io_vd;
756
757 zfs_zone_zio_done(zio);
758
759 /*
760 * If the device returned EIO, then attempt a DKIOCSTATE ioctl to see if
761 * the device has been removed. If this is the case, then we trigger an
762 * asynchronous removal of the device. Otherwise, probe the device and
763 * make sure it's still accessible.
764 */
765 if (zio->io_error == EIO && !vd->vdev_remove_wanted) {
766 vdev_disk_t *dvd = vd->vdev_tsd;
767 int state = DKIO_NONE;
768
769 if (ldi_ioctl(dvd->vd_lh, DKIOCSTATE, (intptr_t)&state,
770 FKIOCTL, kcred, NULL) == 0 && state != DKIO_INSERTED) {
771 /*
772 * We post the resource as soon as possible, instead of
773 * when the async removal actually happens, because the
774 * DE is using this information to discard previous I/O
775 * errors.
776 */
777 zfs_post_remove(zio->io_spa, vd);
778 vd->vdev_remove_wanted = B_TRUE;
779 spa_async_request(zio->io_spa, SPA_ASYNC_REMOVE);
780 } else if (!vd->vdev_delayed_close) {
781 vd->vdev_delayed_close = B_TRUE;
782 }
783 }
784 }
785
786 vdev_ops_t vdev_disk_ops = {
787 vdev_disk_open,
788 vdev_disk_close,
789 vdev_default_asize,
790 vdev_disk_io_start,
791 vdev_disk_io_done,
792 NULL,
793 vdev_disk_hold,
794 vdev_disk_rele,
795 VDEV_TYPE_DISK, /* name of this vdev type */
796 B_TRUE /* leaf vdev */
797 };
798
799 /*
800 * Given the root disk device devid or pathname, read the label from
801 * the device, and construct a configuration nvlist.
802 */
803 int
804 vdev_disk_read_rootlabel(char *devpath, char *devid, nvlist_t **config)
805 {
806 ldi_handle_t vd_lh;
807 vdev_label_t *label;
808 uint64_t s, size;
809 int l;
810 ddi_devid_t tmpdevid;
811 int error = -1;
812 char *minor_name;
813
814 /*
815 * Read the device label and build the nvlist.
816 */
817 if (devid != NULL && ddi_devid_str_decode(devid, &tmpdevid,
818 &minor_name) == 0) {
819 error = ldi_open_by_devid(tmpdevid, minor_name,
820 FREAD, kcred, &vd_lh, zfs_li);
821 ddi_devid_free(tmpdevid);
822 ddi_devid_str_free(minor_name);
823 }
824
825 if (error && (error = ldi_open_by_name(devpath, FREAD, kcred, &vd_lh,
826 zfs_li)))
827 return (error);
828
829 if (ldi_get_size(vd_lh, &s)) {
830 (void) ldi_close(vd_lh, FREAD, kcred);
831 return (EIO);
832 }
833
834 size = P2ALIGN_TYPED(s, sizeof (vdev_label_t), uint64_t);
835 label = kmem_alloc(sizeof (vdev_label_t), KM_SLEEP);
836
837 *config = NULL;
838 for (l = 0; l < VDEV_LABELS; l++) {
839 uint64_t offset, state, txg = 0;
840
841 /* read vdev label */
842 offset = vdev_label_offset(size, l, 0);
843 if (vdev_disk_ldi_physio(vd_lh, (caddr_t)label,
844 VDEV_SKIP_SIZE + VDEV_PHYS_SIZE, offset, B_READ) != 0)
845 continue;
846
847 if (nvlist_unpack(label->vl_vdev_phys.vp_nvlist,
848 sizeof (label->vl_vdev_phys.vp_nvlist), config, 0) != 0) {
849 *config = NULL;
850 continue;
851 }
852
853 if (nvlist_lookup_uint64(*config, ZPOOL_CONFIG_POOL_STATE,
854 &state) != 0 || state >= POOL_STATE_DESTROYED) {
855 nvlist_free(*config);
856 *config = NULL;
857 continue;
858 }
859
860 if (nvlist_lookup_uint64(*config, ZPOOL_CONFIG_POOL_TXG,
861 &txg) != 0 || txg == 0) {
862 nvlist_free(*config);
863 *config = NULL;
864 continue;
865 }
866
867 break;
868 }
869
870 kmem_free(label, sizeof (vdev_label_t));
871 (void) ldi_close(vd_lh, FREAD, kcred);
872 if (*config == NULL)
873 error = EIDRM;
874
875 return (error);
876 }