95
96#include <geom/geom.h>
97
98#include "zfs_namecheck.h"
99
100struct g_class zfs_zvol_class = {
101 .name = "ZFS::ZVOL",
102 .version = G_VERSION,
103};
104
105DECLARE_GEOM_CLASS(zfs_zvol_class, zfs_zvol);
106
107void *zfsdev_state;
108static char *zvol_tag = "zvol_tag";
109
110#define ZVOL_DUMPSIZE "dumpsize"
111
112/*
113 * The spa_namespace_lock protects the zfsdev_state structure from being
114 * modified while it's being used, e.g. an open that comes in before a
115 * create finishes. It also protects temporary opens of the dataset so that,
116 * e.g., an open doesn't get a spurious EBUSY.
117 */
118static uint32_t zvol_minors;
119
120SYSCTL_DECL(_vfs_zfs);
121SYSCTL_NODE(_vfs_zfs, OID_AUTO, vol, CTLFLAG_RW, 0, "ZFS VOLUME");
122static int volmode = ZFS_VOLMODE_GEOM;
123SYSCTL_INT(_vfs_zfs_vol, OID_AUTO, mode, CTLFLAG_RWTUN, &volmode, 0,
124 "Expose as GEOM providers (1), device files (2) or neither");
125
126typedef struct zvol_extent {
127 list_node_t ze_node;
128 dva_t ze_dva; /* dva associated with this extent */
129 uint64_t ze_nblks; /* number of blocks in extent */
130} zvol_extent_t;
131
132/*
133 * The in-core state of each volume.
134 */
135typedef struct zvol_state {
136 LIST_ENTRY(zvol_state) zv_links;
137 char zv_name[MAXPATHLEN]; /* pool/dd name */
138 uint64_t zv_volsize; /* amount of space we advertise */
139 uint64_t zv_volblocksize; /* volume block size */
140 struct cdev *zv_dev; /* non-GEOM device */
141 struct g_provider *zv_provider; /* GEOM provider */
142 uint8_t zv_min_bs; /* minimum addressable block shift */
143 uint8_t zv_flags; /* readonly, dumpified, etc. */
144 objset_t *zv_objset; /* objset handle */
145 uint32_t zv_total_opens; /* total open count */
146 zilog_t *zv_zilog; /* ZIL handle */
147 list_t zv_extents; /* List of extents for dump */
148 znode_t zv_znode; /* for range locking */
149 dmu_buf_t *zv_dbuf; /* bonus handle */
150 int zv_state;
151 int zv_volmode; /* Provide GEOM or cdev */
152 struct bio_queue_head zv_queue;
153 struct mtx zv_queue_mtx; /* zv_queue mutex */
154} zvol_state_t;
155
156static LIST_HEAD(, zvol_state) all_zvols;
157
158/*
159 * zvol specific flags
160 */
161#define ZVOL_RDONLY 0x1
162#define ZVOL_DUMPIFIED 0x2
163#define ZVOL_EXCL 0x4
164#define ZVOL_WCE 0x8
165
166/*
167 * zvol maximum transfer in one DMU tx.
168 */
169int zvol_maxphys = DMU_MAX_ACCESS/2;
170
171/*
172 * Toggle unmap functionality.
173 */
174boolean_t zvol_unmap_enabled = B_TRUE;
175SYSCTL_INT(_vfs_zfs_vol, OID_AUTO, unmap_enabled, CTLFLAG_RWTUN,
176 &zvol_unmap_enabled, 0,
177 "Enable UNMAP functionality");
178
179static d_open_t zvol_d_open;
180static d_close_t zvol_d_close;
181static d_read_t zvol_read;
182static d_write_t zvol_write;
183static d_ioctl_t zvol_d_ioctl;
184static d_strategy_t zvol_strategy;
185
186static struct cdevsw zvol_cdevsw = {
187 .d_version = D_VERSION,
188 .d_open = zvol_d_open,
189 .d_close = zvol_d_close,
190 .d_read = zvol_read,
191 .d_write = zvol_write,
192 .d_ioctl = zvol_d_ioctl,
193 .d_strategy = zvol_strategy,
194 .d_name = "zvol",
195 .d_flags = D_DISK | D_TRACKCLOSE,
196};
197
198extern int zfs_set_prop_nvlist(const char *, zprop_source_t,
199 nvlist_t *, nvlist_t *);
200static void zvol_log_truncate(zvol_state_t *zv, dmu_tx_t *tx, uint64_t off,
201 uint64_t len, boolean_t sync);
202static int zvol_remove_zv(zvol_state_t *);
203static int zvol_get_data(void *arg, lr_write_t *lr, char *buf, zio_t *zio);
204static int zvol_dumpify(zvol_state_t *zv);
205static int zvol_dump_fini(zvol_state_t *zv);
206static int zvol_dump_init(zvol_state_t *zv, boolean_t resize);
207
208static void zvol_geom_run(zvol_state_t *zv);
209static void zvol_geom_destroy(zvol_state_t *zv);
210static int zvol_geom_access(struct g_provider *pp, int acr, int acw, int ace);
211static void zvol_geom_start(struct bio *bp);
212static void zvol_geom_worker(void *arg);
213
214static void
215zvol_size_changed(zvol_state_t *zv)
216{
217#ifdef sun
218 dev_t dev = makedevice(maj, min);
219
220 VERIFY(ddi_prop_update_int64(dev, zfs_dip,
221 "Size", volsize) == DDI_SUCCESS);
222 VERIFY(ddi_prop_update_int64(dev, zfs_dip,
223 "Nblocks", lbtodb(volsize)) == DDI_SUCCESS);
224
225 /* Notify specfs to invalidate the cached size */
226 spec_size_invalidate(dev, VBLK);
227 spec_size_invalidate(dev, VCHR);
228#else /* !sun */
229 if (zv->zv_volmode == ZFS_VOLMODE_GEOM) {
230 struct g_provider *pp;
231
232 pp = zv->zv_provider;
233 if (pp == NULL)
234 return;
235 g_topology_lock();
236 g_resize_provider(pp, zv->zv_volsize);
237 g_topology_unlock();
238 }
239#endif /* !sun */
240}
241
242int
243zvol_check_volsize(uint64_t volsize, uint64_t blocksize)
244{
245 if (volsize == 0)
246 return (SET_ERROR(EINVAL));
247
248 if (volsize % blocksize != 0)
249 return (SET_ERROR(EINVAL));
250
251#ifdef _ILP32
252 if (volsize - 1 > SPEC_MAXOFFSET_T)
253 return (SET_ERROR(EOVERFLOW));
254#endif
255 return (0);
256}
257
258int
259zvol_check_volblocksize(uint64_t volblocksize)
260{
261 if (volblocksize < SPA_MINBLOCKSIZE ||
262 volblocksize > SPA_OLD_MAXBLOCKSIZE ||
263 !ISP2(volblocksize))
264 return (SET_ERROR(EDOM));
265
266 return (0);
267}
268
269int
270zvol_get_stats(objset_t *os, nvlist_t *nv)
271{
272 int error;
273 dmu_object_info_t doi;
274 uint64_t val;
275
276 error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &val);
277 if (error)
278 return (error);
279
280 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLSIZE, val);
281
282 error = dmu_object_info(os, ZVOL_OBJ, &doi);
283
284 if (error == 0) {
285 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLBLOCKSIZE,
286 doi.doi_data_block_size);
287 }
288
289 return (error);
290}
291
292static zvol_state_t *
293zvol_minor_lookup(const char *name)
294{
295 zvol_state_t *zv;
296
297 ASSERT(MUTEX_HELD(&spa_namespace_lock));
298
299 LIST_FOREACH(zv, &all_zvols, zv_links) {
300 if (strcmp(zv->zv_name, name) == 0)
301 break;
302 }
303
304 return (zv);
305}
306
307/* extent mapping arg */
308struct maparg {
309 zvol_state_t *ma_zv;
310 uint64_t ma_blks;
311};
312
313/*ARGSUSED*/
314static int
315zvol_map_block(spa_t *spa, zilog_t *zilog, const blkptr_t *bp,
316 const zbookmark_phys_t *zb, const dnode_phys_t *dnp, void *arg)
317{
318 struct maparg *ma = arg;
319 zvol_extent_t *ze;
320 int bs = ma->ma_zv->zv_volblocksize;
321
322 if (BP_IS_HOLE(bp) ||
323 zb->zb_object != ZVOL_OBJ || zb->zb_level != 0)
324 return (0);
325
326 VERIFY(!BP_IS_EMBEDDED(bp));
327
328 VERIFY3U(ma->ma_blks, ==, zb->zb_blkid);
329 ma->ma_blks++;
330
331 /* Abort immediately if we have encountered gang blocks */
332 if (BP_IS_GANG(bp))
333 return (SET_ERROR(EFRAGS));
334
335 /*
336 * See if the block is at the end of the previous extent.
337 */
338 ze = list_tail(&ma->ma_zv->zv_extents);
339 if (ze &&
340 DVA_GET_VDEV(BP_IDENTITY(bp)) == DVA_GET_VDEV(&ze->ze_dva) &&
341 DVA_GET_OFFSET(BP_IDENTITY(bp)) ==
342 DVA_GET_OFFSET(&ze->ze_dva) + ze->ze_nblks * bs) {
343 ze->ze_nblks++;
344 return (0);
345 }
346
347 dprintf_bp(bp, "%s", "next blkptr:");
348
349 /* start a new extent */
350 ze = kmem_zalloc(sizeof (zvol_extent_t), KM_SLEEP);
351 ze->ze_dva = bp->blk_dva[0]; /* structure assignment */
352 ze->ze_nblks = 1;
353 list_insert_tail(&ma->ma_zv->zv_extents, ze);
354 return (0);
355}
356
357static void
358zvol_free_extents(zvol_state_t *zv)
359{
360 zvol_extent_t *ze;
361
362 while (ze = list_head(&zv->zv_extents)) {
363 list_remove(&zv->zv_extents, ze);
364 kmem_free(ze, sizeof (zvol_extent_t));
365 }
366}
367
368static int
369zvol_get_lbas(zvol_state_t *zv)
370{
371 objset_t *os = zv->zv_objset;
372 struct maparg ma;
373 int err;
374
375 ma.ma_zv = zv;
376 ma.ma_blks = 0;
377 zvol_free_extents(zv);
378
379 /* commit any in-flight changes before traversing the dataset */
380 txg_wait_synced(dmu_objset_pool(os), 0);
381 err = traverse_dataset(dmu_objset_ds(os), 0,
382 TRAVERSE_PRE | TRAVERSE_PREFETCH_METADATA, zvol_map_block, &ma);
383 if (err || ma.ma_blks != (zv->zv_volsize / zv->zv_volblocksize)) {
384 zvol_free_extents(zv);
385 return (err ? err : EIO);
386 }
387
388 return (0);
389}
390
391/* ARGSUSED */
392void
393zvol_create_cb(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx)
394{
395 zfs_creat_t *zct = arg;
396 nvlist_t *nvprops = zct->zct_props;
397 int error;
398 uint64_t volblocksize, volsize;
399
400 VERIFY(nvlist_lookup_uint64(nvprops,
401 zfs_prop_to_name(ZFS_PROP_VOLSIZE), &volsize) == 0);
402 if (nvlist_lookup_uint64(nvprops,
403 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &volblocksize) != 0)
404 volblocksize = zfs_prop_default_numeric(ZFS_PROP_VOLBLOCKSIZE);
405
406 /*
407 * These properties must be removed from the list so the generic
408 * property setting step won't apply to them.
409 */
410 VERIFY(nvlist_remove_all(nvprops,
411 zfs_prop_to_name(ZFS_PROP_VOLSIZE)) == 0);
412 (void) nvlist_remove_all(nvprops,
413 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE));
414
415 error = dmu_object_claim(os, ZVOL_OBJ, DMU_OT_ZVOL, volblocksize,
416 DMU_OT_NONE, 0, tx);
417 ASSERT(error == 0);
418
419 error = zap_create_claim(os, ZVOL_ZAP_OBJ, DMU_OT_ZVOL_PROP,
420 DMU_OT_NONE, 0, tx);
421 ASSERT(error == 0);
422
423 error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize, tx);
424 ASSERT(error == 0);
425}
426
427/*
428 * Replay a TX_TRUNCATE ZIL transaction if asked. TX_TRUNCATE is how we
429 * implement DKIOCFREE/free-long-range.
430 */
431static int
432zvol_replay_truncate(zvol_state_t *zv, lr_truncate_t *lr, boolean_t byteswap)
433{
434 uint64_t offset, length;
435
436 if (byteswap)
437 byteswap_uint64_array(lr, sizeof (*lr));
438
439 offset = lr->lr_offset;
440 length = lr->lr_length;
441
442 return (dmu_free_long_range(zv->zv_objset, ZVOL_OBJ, offset, length));
443}
444
445/*
446 * Replay a TX_WRITE ZIL transaction that didn't get committed
447 * after a system failure
448 */
449static int
450zvol_replay_write(zvol_state_t *zv, lr_write_t *lr, boolean_t byteswap)
451{
452 objset_t *os = zv->zv_objset;
453 char *data = (char *)(lr + 1); /* data follows lr_write_t */
454 uint64_t offset, length;
455 dmu_tx_t *tx;
456 int error;
457
458 if (byteswap)
459 byteswap_uint64_array(lr, sizeof (*lr));
460
461 offset = lr->lr_offset;
462 length = lr->lr_length;
463
464 /* If it's a dmu_sync() block, write the whole block */
465 if (lr->lr_common.lrc_reclen == sizeof (lr_write_t)) {
466 uint64_t blocksize = BP_GET_LSIZE(&lr->lr_blkptr);
467 if (length < blocksize) {
468 offset -= offset % blocksize;
469 length = blocksize;
470 }
471 }
472
473 tx = dmu_tx_create(os);
474 dmu_tx_hold_write(tx, ZVOL_OBJ, offset, length);
475 error = dmu_tx_assign(tx, TXG_WAIT);
476 if (error) {
477 dmu_tx_abort(tx);
478 } else {
479 dmu_write(os, ZVOL_OBJ, offset, length, data, tx);
480 dmu_tx_commit(tx);
481 }
482
483 return (error);
484}
485
486/* ARGSUSED */
487static int
488zvol_replay_err(zvol_state_t *zv, lr_t *lr, boolean_t byteswap)
489{
490 return (SET_ERROR(ENOTSUP));
491}
492
493/*
494 * Callback vectors for replaying records.
495 * Only TX_WRITE and TX_TRUNCATE are needed for zvol.
496 */
497zil_replay_func_t *zvol_replay_vector[TX_MAX_TYPE] = {
498 zvol_replay_err, /* 0 no such transaction type */
499 zvol_replay_err, /* TX_CREATE */
500 zvol_replay_err, /* TX_MKDIR */
501 zvol_replay_err, /* TX_MKXATTR */
502 zvol_replay_err, /* TX_SYMLINK */
503 zvol_replay_err, /* TX_REMOVE */
504 zvol_replay_err, /* TX_RMDIR */
505 zvol_replay_err, /* TX_LINK */
506 zvol_replay_err, /* TX_RENAME */
507 zvol_replay_write, /* TX_WRITE */
508 zvol_replay_truncate, /* TX_TRUNCATE */
509 zvol_replay_err, /* TX_SETATTR */
510 zvol_replay_err, /* TX_ACL */
511 zvol_replay_err, /* TX_CREATE_ACL */
512 zvol_replay_err, /* TX_CREATE_ATTR */
513 zvol_replay_err, /* TX_CREATE_ACL_ATTR */
514 zvol_replay_err, /* TX_MKDIR_ACL */
515 zvol_replay_err, /* TX_MKDIR_ATTR */
516 zvol_replay_err, /* TX_MKDIR_ACL_ATTR */
517 zvol_replay_err, /* TX_WRITE2 */
518};
519
520#ifdef sun
521int
522zvol_name2minor(const char *name, minor_t *minor)
523{
524 zvol_state_t *zv;
525
526 mutex_enter(&spa_namespace_lock);
527 zv = zvol_minor_lookup(name);
528 if (minor && zv)
529 *minor = zv->zv_minor;
530 mutex_exit(&spa_namespace_lock);
531 return (zv ? 0 : -1);
532}
533#endif /* sun */
534
535/*
536 * Create a minor node (plus a whole lot more) for the specified volume.
537 */
538int
539zvol_create_minor(const char *name)
540{
541 zfs_soft_state_t *zs;
542 zvol_state_t *zv;
543 objset_t *os;
544 struct cdev *dev;
545 struct g_provider *pp;
546 struct g_geom *gp;
547 dmu_object_info_t doi;
548 uint64_t volsize, mode;
549 int error;
550
551 ZFS_LOG(1, "Creating ZVOL %s...", name);
552
553 mutex_enter(&spa_namespace_lock);
554
555 if (zvol_minor_lookup(name) != NULL) {
556 mutex_exit(&spa_namespace_lock);
557 return (SET_ERROR(EEXIST));
558 }
559
560 /* lie and say we're read-only */
561 error = dmu_objset_own(name, DMU_OST_ZVOL, B_TRUE, FTAG, &os);
562
563 if (error) {
564 mutex_exit(&spa_namespace_lock);
565 return (error);
566 }
567
568#ifdef sun
569 if ((minor = zfsdev_minor_alloc()) == 0) {
570 dmu_objset_disown(os, FTAG);
571 mutex_exit(&spa_namespace_lock);
572 return (SET_ERROR(ENXIO));
573 }
574
575 if (ddi_soft_state_zalloc(zfsdev_state, minor) != DDI_SUCCESS) {
576 dmu_objset_disown(os, FTAG);
577 mutex_exit(&spa_namespace_lock);
578 return (SET_ERROR(EAGAIN));
579 }
580 (void) ddi_prop_update_string(minor, zfs_dip, ZVOL_PROP_NAME,
581 (char *)name);
582
583 (void) snprintf(chrbuf, sizeof (chrbuf), "%u,raw", minor);
584
585 if (ddi_create_minor_node(zfs_dip, chrbuf, S_IFCHR,
586 minor, DDI_PSEUDO, 0) == DDI_FAILURE) {
587 ddi_soft_state_free(zfsdev_state, minor);
588 dmu_objset_disown(os, FTAG);
589 mutex_exit(&spa_namespace_lock);
590 return (SET_ERROR(EAGAIN));
591 }
592
593 (void) snprintf(blkbuf, sizeof (blkbuf), "%u", minor);
594
595 if (ddi_create_minor_node(zfs_dip, blkbuf, S_IFBLK,
596 minor, DDI_PSEUDO, 0) == DDI_FAILURE) {
597 ddi_remove_minor_node(zfs_dip, chrbuf);
598 ddi_soft_state_free(zfsdev_state, minor);
599 dmu_objset_disown(os, FTAG);
600 mutex_exit(&spa_namespace_lock);
601 return (SET_ERROR(EAGAIN));
602 }
603
604 zs = ddi_get_soft_state(zfsdev_state, minor);
605 zs->zss_type = ZSST_ZVOL;
606 zv = zs->zss_data = kmem_zalloc(sizeof (zvol_state_t), KM_SLEEP);
607#else /* !sun */
608
609 zv = kmem_zalloc(sizeof(*zv), KM_SLEEP);
610 zv->zv_state = 0;
611 error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize);
612 if (error) {
613 kmem_free(zv, sizeof(*zv));
614 dmu_objset_disown(os, zvol_tag);
615 mutex_exit(&spa_namespace_lock);
616 return (error);
617 }
618 error = dsl_prop_get_integer(name,
619 zfs_prop_to_name(ZFS_PROP_VOLMODE), &mode, NULL);
620 if (error != 0 || mode == ZFS_VOLMODE_DEFAULT)
621 mode = volmode;
622
623 DROP_GIANT();
624 zv->zv_volsize = volsize;
625 zv->zv_volmode = mode;
626 if (zv->zv_volmode == ZFS_VOLMODE_GEOM) {
627 g_topology_lock();
628 gp = g_new_geomf(&zfs_zvol_class, "zfs::zvol::%s", name);
629 gp->start = zvol_geom_start;
630 gp->access = zvol_geom_access;
631 pp = g_new_providerf(gp, "%s/%s", ZVOL_DRIVER, name);
632 pp->flags |= G_PF_DIRECT_RECEIVE | G_PF_DIRECT_SEND;
633 pp->sectorsize = DEV_BSIZE;
634 pp->mediasize = zv->zv_volsize;
635 pp->private = zv;
636
637 zv->zv_provider = pp;
638 bioq_init(&zv->zv_queue);
639 mtx_init(&zv->zv_queue_mtx, "zvol", NULL, MTX_DEF);
640 } else if (zv->zv_volmode == ZFS_VOLMODE_DEV) {
641 if (make_dev_p(MAKEDEV_CHECKNAME | MAKEDEV_WAITOK,
642 &dev, &zvol_cdevsw, NULL, UID_ROOT, GID_OPERATOR,
643 0640, "%s/%s", ZVOL_DRIVER, name) != 0) {
644 kmem_free(zv, sizeof(*zv));
645 dmu_objset_disown(os, FTAG);
646 mutex_exit(&spa_namespace_lock);
647 return (SET_ERROR(ENXIO));
648 }
649 zv->zv_dev = dev;
650 dev->si_iosize_max = MAXPHYS;
651 dev->si_drv2 = zv;
652 }
653 LIST_INSERT_HEAD(&all_zvols, zv, zv_links);
654#endif /* !sun */
655
656 (void) strlcpy(zv->zv_name, name, MAXPATHLEN);
657 zv->zv_min_bs = DEV_BSHIFT;
658 zv->zv_objset = os;
659 if (dmu_objset_is_snapshot(os) || !spa_writeable(dmu_objset_spa(os)))
660 zv->zv_flags |= ZVOL_RDONLY;
661 mutex_init(&zv->zv_znode.z_range_lock, NULL, MUTEX_DEFAULT, NULL);
662 avl_create(&zv->zv_znode.z_range_avl, zfs_range_compare,
663 sizeof (rl_t), offsetof(rl_t, r_node));
664 list_create(&zv->zv_extents, sizeof (zvol_extent_t),
665 offsetof(zvol_extent_t, ze_node));
666 /* get and cache the blocksize */
667 error = dmu_object_info(os, ZVOL_OBJ, &doi);
668 ASSERT(error == 0);
669 zv->zv_volblocksize = doi.doi_data_block_size;
670
671 if (spa_writeable(dmu_objset_spa(os))) {
672 if (zil_replay_disable)
673 zil_destroy(dmu_objset_zil(os), B_FALSE);
674 else
675 zil_replay(os, zv, zvol_replay_vector);
676 }
677 dmu_objset_disown(os, FTAG);
678 zv->zv_objset = NULL;
679
680 zvol_minors++;
681
682 mutex_exit(&spa_namespace_lock);
683
684#ifndef sun
685 if (zv->zv_volmode == ZFS_VOLMODE_GEOM) {
686 zvol_geom_run(zv);
687 g_topology_unlock();
688 }
689 PICKUP_GIANT();
690#endif
691
692 ZFS_LOG(1, "ZVOL %s created.", name);
693
694 return (0);
695}
696
697/*
698 * Remove minor node for the specified volume.
699 */
700static int
701zvol_remove_zv(zvol_state_t *zv)
702{
703#ifdef sun
704 minor_t minor = zv->zv_minor;
705#endif
706
707 ASSERT(MUTEX_HELD(&spa_namespace_lock));
708 if (zv->zv_total_opens != 0)
709 return (SET_ERROR(EBUSY));
710
711 ZFS_LOG(1, "ZVOL %s destroyed.", zv->zv_name);
712
713#ifdef sun
714 (void) snprintf(nmbuf, sizeof (nmbuf), "%u,raw", minor);
715 ddi_remove_minor_node(zfs_dip, nmbuf);
716#else
717 LIST_REMOVE(zv, zv_links);
718 if (zv->zv_volmode == ZFS_VOLMODE_GEOM) {
719 g_topology_lock();
720 zvol_geom_destroy(zv);
721 g_topology_unlock();
722 } else if (zv->zv_volmode == ZFS_VOLMODE_DEV)
723 destroy_dev(zv->zv_dev);
724#endif /* sun */
725
726 avl_destroy(&zv->zv_znode.z_range_avl);
727 mutex_destroy(&zv->zv_znode.z_range_lock);
728
729 kmem_free(zv, sizeof(*zv));
730
731 zvol_minors--;
732 return (0);
733}
734
735int
736zvol_remove_minor(const char *name)
737{
738 zvol_state_t *zv;
739 int rc;
740
741 mutex_enter(&spa_namespace_lock);
742 if ((zv = zvol_minor_lookup(name)) == NULL) {
743 mutex_exit(&spa_namespace_lock);
744 return (SET_ERROR(ENXIO));
745 }
746 rc = zvol_remove_zv(zv);
747 mutex_exit(&spa_namespace_lock);
748 return (rc);
749}
750
751int
752zvol_first_open(zvol_state_t *zv)
753{
754 objset_t *os;
755 uint64_t volsize;
756 int error;
757 uint64_t readonly;
758
759 /* lie and say we're read-only */
760 error = dmu_objset_own(zv->zv_name, DMU_OST_ZVOL, B_TRUE,
761 zvol_tag, &os);
762 if (error)
763 return (error);
764
765 error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize);
766 if (error) {
767 ASSERT(error == 0);
768 dmu_objset_disown(os, zvol_tag);
769 return (error);
770 }
771 zv->zv_objset = os;
772 error = dmu_bonus_hold(os, ZVOL_OBJ, zvol_tag, &zv->zv_dbuf);
773 if (error) {
774 dmu_objset_disown(os, zvol_tag);
775 return (error);
776 }
777 zv->zv_volsize = volsize;
778 zv->zv_zilog = zil_open(os, zvol_get_data);
779 zvol_size_changed(zv);
780
781 VERIFY(dsl_prop_get_integer(zv->zv_name, "readonly", &readonly,
782 NULL) == 0);
783 if (readonly || dmu_objset_is_snapshot(os) ||
784 !spa_writeable(dmu_objset_spa(os)))
785 zv->zv_flags |= ZVOL_RDONLY;
786 else
787 zv->zv_flags &= ~ZVOL_RDONLY;
788 return (error);
789}
790
791void
792zvol_last_close(zvol_state_t *zv)
793{
794 zil_close(zv->zv_zilog);
795 zv->zv_zilog = NULL;
796
797 dmu_buf_rele(zv->zv_dbuf, zvol_tag);
798 zv->zv_dbuf = NULL;
799
800 /*
801 * Evict cached data
802 */
803 if (dsl_dataset_is_dirty(dmu_objset_ds(zv->zv_objset)) &&
804 !(zv->zv_flags & ZVOL_RDONLY))
805 txg_wait_synced(dmu_objset_pool(zv->zv_objset), 0);
806 dmu_objset_evict_dbufs(zv->zv_objset);
807
808 dmu_objset_disown(zv->zv_objset, zvol_tag);
809 zv->zv_objset = NULL;
810}
811
812#ifdef sun
813int
814zvol_prealloc(zvol_state_t *zv)
815{
816 objset_t *os = zv->zv_objset;
817 dmu_tx_t *tx;
818 uint64_t refd, avail, usedobjs, availobjs;
819 uint64_t resid = zv->zv_volsize;
820 uint64_t off = 0;
821
822 /* Check the space usage before attempting to allocate the space */
823 dmu_objset_space(os, &refd, &avail, &usedobjs, &availobjs);
824 if (avail < zv->zv_volsize)
825 return (SET_ERROR(ENOSPC));
826
827 /* Free old extents if they exist */
828 zvol_free_extents(zv);
829
830 while (resid != 0) {
831 int error;
832 uint64_t bytes = MIN(resid, SPA_OLD_MAXBLOCKSIZE);
833
834 tx = dmu_tx_create(os);
835 dmu_tx_hold_write(tx, ZVOL_OBJ, off, bytes);
836 error = dmu_tx_assign(tx, TXG_WAIT);
837 if (error) {
838 dmu_tx_abort(tx);
839 (void) dmu_free_long_range(os, ZVOL_OBJ, 0, off);
840 return (error);
841 }
842 dmu_prealloc(os, ZVOL_OBJ, off, bytes, tx);
843 dmu_tx_commit(tx);
844 off += bytes;
845 resid -= bytes;
846 }
847 txg_wait_synced(dmu_objset_pool(os), 0);
848
849 return (0);
850}
851#endif /* sun */
852
853static int
854zvol_update_volsize(objset_t *os, uint64_t volsize)
855{
856 dmu_tx_t *tx;
857 int error;
858
859 ASSERT(MUTEX_HELD(&spa_namespace_lock));
860
861 tx = dmu_tx_create(os);
862 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL);
863 dmu_tx_mark_netfree(tx);
864 error = dmu_tx_assign(tx, TXG_WAIT);
865 if (error) {
866 dmu_tx_abort(tx);
867 return (error);
868 }
869
870 error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1,
871 &volsize, tx);
872 dmu_tx_commit(tx);
873
874 if (error == 0)
875 error = dmu_free_long_range(os,
876 ZVOL_OBJ, volsize, DMU_OBJECT_END);
877 return (error);
878}
879
880void
881zvol_remove_minors(const char *name)
882{
883 zvol_state_t *zv, *tzv;
884 size_t namelen;
885
886 namelen = strlen(name);
887
888 DROP_GIANT();
889 mutex_enter(&spa_namespace_lock);
890
891 LIST_FOREACH_SAFE(zv, &all_zvols, zv_links, tzv) {
892 if (strcmp(zv->zv_name, name) == 0 ||
893 (strncmp(zv->zv_name, name, namelen) == 0 &&
894 strlen(zv->zv_name) > namelen && (zv->zv_name[namelen] == '/' ||
895 zv->zv_name[namelen] == '@'))) {
896 (void) zvol_remove_zv(zv);
897 }
898 }
899
900 mutex_exit(&spa_namespace_lock);
901 PICKUP_GIANT();
902}
903
904int
905zvol_set_volsize(const char *name, major_t maj, uint64_t volsize)
906{
907 zvol_state_t *zv = NULL;
908 objset_t *os;
909 int error;
910 dmu_object_info_t doi;
911 uint64_t old_volsize = 0ULL;
912 uint64_t readonly;
913
914 mutex_enter(&spa_namespace_lock);
915 zv = zvol_minor_lookup(name);
916 if ((error = dmu_objset_hold(name, FTAG, &os)) != 0) {
917 mutex_exit(&spa_namespace_lock);
918 return (error);
919 }
920
921 if ((error = dmu_object_info(os, ZVOL_OBJ, &doi)) != 0 ||
922 (error = zvol_check_volsize(volsize,
923 doi.doi_data_block_size)) != 0)
924 goto out;
925
926 VERIFY(dsl_prop_get_integer(name, "readonly", &readonly,
927 NULL) == 0);
928 if (readonly) {
929 error = EROFS;
930 goto out;
931 }
932
933 error = zvol_update_volsize(os, volsize);
934 /*
935 * Reinitialize the dump area to the new size. If we
936 * failed to resize the dump area then restore it back to
937 * its original size.
938 */
939 if (zv && error == 0) {
940#ifdef ZVOL_DUMP
941 if (zv->zv_flags & ZVOL_DUMPIFIED) {
942 old_volsize = zv->zv_volsize;
943 zv->zv_volsize = volsize;
944 if ((error = zvol_dumpify(zv)) != 0 ||
945 (error = dumpvp_resize()) != 0) {
946 (void) zvol_update_volsize(os, old_volsize);
947 zv->zv_volsize = old_volsize;
948 error = zvol_dumpify(zv);
949 }
950 }
951#endif /* ZVOL_DUMP */
952 if (error == 0) {
953 zv->zv_volsize = volsize;
954 zvol_size_changed(zv);
955 }
956 }
957
958#ifdef sun
959 /*
960 * Generate a LUN expansion event.
961 */
962 if (zv && error == 0) {
963 sysevent_id_t eid;
964 nvlist_t *attr;
965 char *physpath = kmem_zalloc(MAXPATHLEN, KM_SLEEP);
966
967 (void) snprintf(physpath, MAXPATHLEN, "%s%u", ZVOL_PSEUDO_DEV,
968 zv->zv_minor);
969
970 VERIFY(nvlist_alloc(&attr, NV_UNIQUE_NAME, KM_SLEEP) == 0);
971 VERIFY(nvlist_add_string(attr, DEV_PHYS_PATH, physpath) == 0);
972
973 (void) ddi_log_sysevent(zfs_dip, SUNW_VENDOR, EC_DEV_STATUS,
974 ESC_DEV_DLE, attr, &eid, DDI_SLEEP);
975
976 nvlist_free(attr);
977 kmem_free(physpath, MAXPATHLEN);
978 }
979#endif /* sun */
980
981out:
982 dmu_objset_rele(os, FTAG);
983
984 mutex_exit(&spa_namespace_lock);
985
986 return (error);
987}
988
989/*ARGSUSED*/
990static int
991zvol_open(struct g_provider *pp, int flag, int count)
992{
993 zvol_state_t *zv;
994 int err = 0;
995 boolean_t locked = B_FALSE;
996
997 /*
998 * Protect against recursively entering spa_namespace_lock
999 * when spa_open() is used for a pool on a (local) ZVOL(s).
1000 * This is needed since we replaced upstream zfsdev_state_lock
1001 * with spa_namespace_lock in the ZVOL code.
1002 * We are using the same trick as spa_open().
1003 * Note that calls in zvol_first_open which need to resolve
1004 * pool name to a spa object will enter spa_open()
1005 * recursively, but that function already has all the
1006 * necessary protection.
1007 */
1008 if (!MUTEX_HELD(&spa_namespace_lock)) {
1009 mutex_enter(&spa_namespace_lock);
1010 locked = B_TRUE;
1011 }
1012
1013 zv = pp->private;
1014 if (zv == NULL) {
1015 if (locked)
1016 mutex_exit(&spa_namespace_lock);
1017 return (SET_ERROR(ENXIO));
1018 }
1019
1020 if (zv->zv_total_opens == 0) {
1021 err = zvol_first_open(zv);
1022 if (err) {
1023 if (locked)
1024 mutex_exit(&spa_namespace_lock);
1025 return (err);
1026 }
1027 pp->mediasize = zv->zv_volsize;
1028 pp->stripeoffset = 0;
1029 pp->stripesize = zv->zv_volblocksize;
1030 }
1031 if ((flag & FWRITE) && (zv->zv_flags & ZVOL_RDONLY)) {
1032 err = SET_ERROR(EROFS);
1033 goto out;
1034 }
1035 if (zv->zv_flags & ZVOL_EXCL) {
1036 err = SET_ERROR(EBUSY);
1037 goto out;
1038 }
1039#ifdef FEXCL
1040 if (flag & FEXCL) {
1041 if (zv->zv_total_opens != 0) {
1042 err = SET_ERROR(EBUSY);
1043 goto out;
1044 }
1045 zv->zv_flags |= ZVOL_EXCL;
1046 }
1047#endif
1048
1049 zv->zv_total_opens += count;
1050 if (locked)
1051 mutex_exit(&spa_namespace_lock);
1052
1053 return (err);
1054out:
1055 if (zv->zv_total_opens == 0)
1056 zvol_last_close(zv);
1057 if (locked)
1058 mutex_exit(&spa_namespace_lock);
1059 return (err);
1060}
1061
1062/*ARGSUSED*/
1063static int
1064zvol_close(struct g_provider *pp, int flag, int count)
1065{
1066 zvol_state_t *zv;
1067 int error = 0;
1068 boolean_t locked = B_FALSE;
1069
1070 /* See comment in zvol_open(). */
1071 if (!MUTEX_HELD(&spa_namespace_lock)) {
1072 mutex_enter(&spa_namespace_lock);
1073 locked = B_TRUE;
1074 }
1075
1076 zv = pp->private;
1077 if (zv == NULL) {
1078 if (locked)
1079 mutex_exit(&spa_namespace_lock);
1080 return (SET_ERROR(ENXIO));
1081 }
1082
1083 if (zv->zv_flags & ZVOL_EXCL) {
1084 ASSERT(zv->zv_total_opens == 1);
1085 zv->zv_flags &= ~ZVOL_EXCL;
1086 }
1087
1088 /*
1089 * If the open count is zero, this is a spurious close.
1090 * That indicates a bug in the kernel / DDI framework.
1091 */
1092 ASSERT(zv->zv_total_opens != 0);
1093
1094 /*
1095 * You may get multiple opens, but only one close.
1096 */
1097 zv->zv_total_opens -= count;
1098
1099 if (zv->zv_total_opens == 0)
1100 zvol_last_close(zv);
1101
1102 if (locked)
1103 mutex_exit(&spa_namespace_lock);
1104 return (error);
1105}
1106
1107static void
1108zvol_get_done(zgd_t *zgd, int error)
1109{
1110 if (zgd->zgd_db)
1111 dmu_buf_rele(zgd->zgd_db, zgd);
1112
1113 zfs_range_unlock(zgd->zgd_rl);
1114
1115 if (error == 0 && zgd->zgd_bp)
1116 zil_add_block(zgd->zgd_zilog, zgd->zgd_bp);
1117
1118 kmem_free(zgd, sizeof (zgd_t));
1119}
1120
1121/*
1122 * Get data to generate a TX_WRITE intent log record.
1123 */
1124static int
1125zvol_get_data(void *arg, lr_write_t *lr, char *buf, zio_t *zio)
1126{
1127 zvol_state_t *zv = arg;
1128 objset_t *os = zv->zv_objset;
1129 uint64_t object = ZVOL_OBJ;
1130 uint64_t offset = lr->lr_offset;
1131 uint64_t size = lr->lr_length; /* length of user data */
1132 blkptr_t *bp = &lr->lr_blkptr;
1133 dmu_buf_t *db;
1134 zgd_t *zgd;
1135 int error;
1136
1137 ASSERT(zio != NULL);
1138 ASSERT(size != 0);
1139
1140 zgd = kmem_zalloc(sizeof (zgd_t), KM_SLEEP);
1141 zgd->zgd_zilog = zv->zv_zilog;
1142 zgd->zgd_rl = zfs_range_lock(&zv->zv_znode, offset, size, RL_READER);
1143
1144 /*
1145 * Write records come in two flavors: immediate and indirect.
1146 * For small writes it's cheaper to store the data with the
1147 * log record (immediate); for large writes it's cheaper to
1148 * sync the data and get a pointer to it (indirect) so that
1149 * we don't have to write the data twice.
1150 */
1151 if (buf != NULL) { /* immediate write */
1152 error = dmu_read(os, object, offset, size, buf,
1153 DMU_READ_NO_PREFETCH);
1154 } else {
1155 size = zv->zv_volblocksize;
1156 offset = P2ALIGN(offset, size);
1157 error = dmu_buf_hold(os, object, offset, zgd, &db,
1158 DMU_READ_NO_PREFETCH);
1159 if (error == 0) {
1160 blkptr_t *obp = dmu_buf_get_blkptr(db);
1161 if (obp) {
1162 ASSERT(BP_IS_HOLE(bp));
1163 *bp = *obp;
1164 }
1165
1166 zgd->zgd_db = db;
1167 zgd->zgd_bp = bp;
1168
1169 ASSERT(db->db_offset == offset);
1170 ASSERT(db->db_size == size);
1171
1172 error = dmu_sync(zio, lr->lr_common.lrc_txg,
1173 zvol_get_done, zgd);
1174
1175 if (error == 0)
1176 return (0);
1177 }
1178 }
1179
1180 zvol_get_done(zgd, error);
1181
1182 return (error);
1183}
1184
1185/*
1186 * zvol_log_write() handles synchronous writes using TX_WRITE ZIL transactions.
1187 *
1188 * We store data in the log buffers if it's small enough.
1189 * Otherwise we will later flush the data out via dmu_sync().
1190 */
1191ssize_t zvol_immediate_write_sz = 32768;
1192
1193static void
1194zvol_log_write(zvol_state_t *zv, dmu_tx_t *tx, offset_t off, ssize_t resid,
1195 boolean_t sync)
1196{
1197 uint32_t blocksize = zv->zv_volblocksize;
1198 zilog_t *zilog = zv->zv_zilog;
1199 boolean_t slogging;
1200 ssize_t immediate_write_sz;
1201
1202 if (zil_replaying(zilog, tx))
1203 return;
1204
1205 immediate_write_sz = (zilog->zl_logbias == ZFS_LOGBIAS_THROUGHPUT)
1206 ? 0 : zvol_immediate_write_sz;
1207
1208 slogging = spa_has_slogs(zilog->zl_spa) &&
1209 (zilog->zl_logbias == ZFS_LOGBIAS_LATENCY);
1210
1211 while (resid) {
1212 itx_t *itx;
1213 lr_write_t *lr;
1214 ssize_t len;
1215 itx_wr_state_t write_state;
1216
1217 /*
1218 * Unlike zfs_log_write() we can be called with
1219 * upto DMU_MAX_ACCESS/2 (5MB) writes.
1220 */
1221 if (blocksize > immediate_write_sz && !slogging &&
1222 resid >= blocksize && off % blocksize == 0) {
1223 write_state = WR_INDIRECT; /* uses dmu_sync */
1224 len = blocksize;
1225 } else if (sync) {
1226 write_state = WR_COPIED;
1227 len = MIN(ZIL_MAX_LOG_DATA, resid);
1228 } else {
1229 write_state = WR_NEED_COPY;
1230 len = MIN(ZIL_MAX_LOG_DATA, resid);
1231 }
1232
1233 itx = zil_itx_create(TX_WRITE, sizeof (*lr) +
1234 (write_state == WR_COPIED ? len : 0));
1235 lr = (lr_write_t *)&itx->itx_lr;
1236 if (write_state == WR_COPIED && dmu_read(zv->zv_objset,
1237 ZVOL_OBJ, off, len, lr + 1, DMU_READ_NO_PREFETCH) != 0) {
1238 zil_itx_destroy(itx);
1239 itx = zil_itx_create(TX_WRITE, sizeof (*lr));
1240 lr = (lr_write_t *)&itx->itx_lr;
1241 write_state = WR_NEED_COPY;
1242 }
1243
1244 itx->itx_wr_state = write_state;
1245 if (write_state == WR_NEED_COPY)
1246 itx->itx_sod += len;
1247 lr->lr_foid = ZVOL_OBJ;
1248 lr->lr_offset = off;
1249 lr->lr_length = len;
1250 lr->lr_blkoff = 0;
1251 BP_ZERO(&lr->lr_blkptr);
1252
1253 itx->itx_private = zv;
1254 itx->itx_sync = sync;
1255
1256 zil_itx_assign(zilog, itx, tx);
1257
1258 off += len;
1259 resid -= len;
1260 }
1261}
1262
1263#ifdef sun
1264static int
1265zvol_dumpio_vdev(vdev_t *vd, void *addr, uint64_t offset, uint64_t origoffset,
1266 uint64_t size, boolean_t doread, boolean_t isdump)
1267{
1268 vdev_disk_t *dvd;
1269 int c;
1270 int numerrors = 0;
1271
1272 if (vd->vdev_ops == &vdev_mirror_ops ||
1273 vd->vdev_ops == &vdev_replacing_ops ||
1274 vd->vdev_ops == &vdev_spare_ops) {
1275 for (c = 0; c < vd->vdev_children; c++) {
1276 int err = zvol_dumpio_vdev(vd->vdev_child[c],
1277 addr, offset, origoffset, size, doread, isdump);
1278 if (err != 0) {
1279 numerrors++;
1280 } else if (doread) {
1281 break;
1282 }
1283 }
1284 }
1285
1286 if (!vd->vdev_ops->vdev_op_leaf && vd->vdev_ops != &vdev_raidz_ops)
1287 return (numerrors < vd->vdev_children ? 0 : EIO);
1288
1289 if (doread && !vdev_readable(vd))
1290 return (SET_ERROR(EIO));
1291 else if (!doread && !vdev_writeable(vd))
1292 return (SET_ERROR(EIO));
1293
1294 if (vd->vdev_ops == &vdev_raidz_ops) {
1295 return (vdev_raidz_physio(vd,
1296 addr, size, offset, origoffset, doread, isdump));
1297 }
1298
1299 offset += VDEV_LABEL_START_SIZE;
1300
1301 if (ddi_in_panic() || isdump) {
1302 ASSERT(!doread);
1303 if (doread)
1304 return (SET_ERROR(EIO));
1305 dvd = vd->vdev_tsd;
1306 ASSERT3P(dvd, !=, NULL);
1307 return (ldi_dump(dvd->vd_lh, addr, lbtodb(offset),
1308 lbtodb(size)));
1309 } else {
1310 dvd = vd->vdev_tsd;
1311 ASSERT3P(dvd, !=, NULL);
1312 return (vdev_disk_ldi_physio(dvd->vd_lh, addr, size,
1313 offset, doread ? B_READ : B_WRITE));
1314 }
1315}
1316
1317static int
1318zvol_dumpio(zvol_state_t *zv, void *addr, uint64_t offset, uint64_t size,
1319 boolean_t doread, boolean_t isdump)
1320{
1321 vdev_t *vd;
1322 int error;
1323 zvol_extent_t *ze;
1324 spa_t *spa = dmu_objset_spa(zv->zv_objset);
1325
1326 /* Must be sector aligned, and not stradle a block boundary. */
1327 if (P2PHASE(offset, DEV_BSIZE) || P2PHASE(size, DEV_BSIZE) ||
1328 P2BOUNDARY(offset, size, zv->zv_volblocksize)) {
1329 return (SET_ERROR(EINVAL));
1330 }
1331 ASSERT(size <= zv->zv_volblocksize);
1332
1333 /* Locate the extent this belongs to */
1334 ze = list_head(&zv->zv_extents);
1335 while (offset >= ze->ze_nblks * zv->zv_volblocksize) {
1336 offset -= ze->ze_nblks * zv->zv_volblocksize;
1337 ze = list_next(&zv->zv_extents, ze);
1338 }
1339
1340 if (ze == NULL)
1341 return (SET_ERROR(EINVAL));
1342
1343 if (!ddi_in_panic())
1344 spa_config_enter(spa, SCL_STATE, FTAG, RW_READER);
1345
1346 vd = vdev_lookup_top(spa, DVA_GET_VDEV(&ze->ze_dva));
1347 offset += DVA_GET_OFFSET(&ze->ze_dva);
1348 error = zvol_dumpio_vdev(vd, addr, offset, DVA_GET_OFFSET(&ze->ze_dva),
1349 size, doread, isdump);
1350
1351 if (!ddi_in_panic())
1352 spa_config_exit(spa, SCL_STATE, FTAG);
1353
1354 return (error);
1355}
1356#endif /* sun */
1357
1358void
1359zvol_strategy(struct bio *bp)
1360{
1361 zvol_state_t *zv;
1362 uint64_t off, volsize;
1363 size_t resid;
1364 char *addr;
1365 objset_t *os;
1366 rl_t *rl;
1367 int error = 0;
1368 boolean_t doread = 0;
1369 boolean_t is_dumpified;
1370 boolean_t sync;
1371
1372 if (bp->bio_to)
1373 zv = bp->bio_to->private;
1374 else
1375 zv = bp->bio_dev->si_drv2;
1376
1377 if (zv == NULL) {
1378 error = ENXIO;
1379 goto out;
1380 }
1381
1382 if (bp->bio_cmd != BIO_READ && (zv->zv_flags & ZVOL_RDONLY)) {
1383 error = EROFS;
1384 goto out;
1385 }
1386
1387 switch (bp->bio_cmd) {
1388 case BIO_FLUSH:
1389 goto sync;
1390 case BIO_READ:
1391 doread = 1;
1392 case BIO_WRITE:
1393 case BIO_DELETE:
1394 break;
1395 default:
1396 error = EOPNOTSUPP;
1397 goto out;
1398 }
1399
1400 off = bp->bio_offset;
1401 volsize = zv->zv_volsize;
1402
1403 os = zv->zv_objset;
1404 ASSERT(os != NULL);
1405
1406 addr = bp->bio_data;
1407 resid = bp->bio_length;
1408
1409 if (resid > 0 && (off < 0 || off >= volsize)) {
1410 error = EIO;
1411 goto out;
1412 }
1413
1414#ifdef illumos
1415 is_dumpified = zv->zv_flags & ZVOL_DUMPIFIED;
1416#else
1417 is_dumpified = B_FALSE;
1418#endif
1419 sync = !doread && !is_dumpified &&
1420 zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS;
1421
1422 /*
1423 * There must be no buffer changes when doing a dmu_sync() because
1424 * we can't change the data whilst calculating the checksum.
1425 */
1426 rl = zfs_range_lock(&zv->zv_znode, off, resid,
1427 doread ? RL_READER : RL_WRITER);
1428
1429 if (bp->bio_cmd == BIO_DELETE) {
1430 dmu_tx_t *tx = dmu_tx_create(zv->zv_objset);
1431 error = dmu_tx_assign(tx, TXG_WAIT);
1432 if (error != 0) {
1433 dmu_tx_abort(tx);
1434 } else {
1435 zvol_log_truncate(zv, tx, off, resid, B_TRUE);
1436 dmu_tx_commit(tx);
1437 error = dmu_free_long_range(zv->zv_objset, ZVOL_OBJ,
1438 off, resid);
1439 resid = 0;
1440 }
1441 goto unlock;
1442 }
1443
1444 while (resid != 0 && off < volsize) {
1445 size_t size = MIN(resid, zvol_maxphys);
1446#ifdef illumos
1447 if (is_dumpified) {
1448 size = MIN(size, P2END(off, zv->zv_volblocksize) - off);
1449 error = zvol_dumpio(zv, addr, off, size,
1450 doread, B_FALSE);
1451 } else if (doread) {
1452#else
1453 if (doread) {
1454#endif
1455 error = dmu_read(os, ZVOL_OBJ, off, size, addr,
1456 DMU_READ_PREFETCH);
1457 } else {
1458 dmu_tx_t *tx = dmu_tx_create(os);
1459 dmu_tx_hold_write(tx, ZVOL_OBJ, off, size);
1460 error = dmu_tx_assign(tx, TXG_WAIT);
1461 if (error) {
1462 dmu_tx_abort(tx);
1463 } else {
1464 dmu_write(os, ZVOL_OBJ, off, size, addr, tx);
1465 zvol_log_write(zv, tx, off, size, sync);
1466 dmu_tx_commit(tx);
1467 }
1468 }
1469 if (error) {
1470 /* convert checksum errors into IO errors */
1471 if (error == ECKSUM)
1472 error = SET_ERROR(EIO);
1473 break;
1474 }
1475 off += size;
1476 addr += size;
1477 resid -= size;
1478 }
1479unlock:
1480 zfs_range_unlock(rl);
1481
1482 bp->bio_completed = bp->bio_length - resid;
1483 if (bp->bio_completed < bp->bio_length && off > volsize)
1484 error = EINVAL;
1485
1486 if (sync) {
1487sync:
1488 zil_commit(zv->zv_zilog, ZVOL_OBJ);
1489 }
1490out:
1491 if (bp->bio_to)
1492 g_io_deliver(bp, error);
1493 else
1494 biofinish(bp, NULL, error);
1495}
1496
1497#ifdef sun
1498/*
1499 * Set the buffer count to the zvol maximum transfer.
1500 * Using our own routine instead of the default minphys()
1501 * means that for larger writes we write bigger buffers on X86
1502 * (128K instead of 56K) and flush the disk write cache less often
1503 * (every zvol_maxphys - currently 1MB) instead of minphys (currently
1504 * 56K on X86 and 128K on sparc).
1505 */
1506void
1507zvol_minphys(struct buf *bp)
1508{
1509 if (bp->b_bcount > zvol_maxphys)
1510 bp->b_bcount = zvol_maxphys;
1511}
1512
1513int
1514zvol_dump(dev_t dev, caddr_t addr, daddr_t blkno, int nblocks)
1515{
1516 minor_t minor = getminor(dev);
1517 zvol_state_t *zv;
1518 int error = 0;
1519 uint64_t size;
1520 uint64_t boff;
1521 uint64_t resid;
1522
1523 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL);
1524 if (zv == NULL)
1525 return (SET_ERROR(ENXIO));
1526
1527 if ((zv->zv_flags & ZVOL_DUMPIFIED) == 0)
1528 return (SET_ERROR(EINVAL));
1529
1530 boff = ldbtob(blkno);
1531 resid = ldbtob(nblocks);
1532
1533 VERIFY3U(boff + resid, <=, zv->zv_volsize);
1534
1535 while (resid) {
1536 size = MIN(resid, P2END(boff, zv->zv_volblocksize) - boff);
1537 error = zvol_dumpio(zv, addr, boff, size, B_FALSE, B_TRUE);
1538 if (error)
1539 break;
1540 boff += size;
1541 addr += size;
1542 resid -= size;
1543 }
1544
1545 return (error);
1546}
1547
1548/*ARGSUSED*/
1549int
1550zvol_read(dev_t dev, uio_t *uio, cred_t *cr)
1551{
1552 minor_t minor = getminor(dev);
1553#else
1554int
1555zvol_read(struct cdev *dev, struct uio *uio, int ioflag)
1556{
1557#endif
1558 zvol_state_t *zv;
1559 uint64_t volsize;
1560 rl_t *rl;
1561 int error = 0;
1562
1563#ifdef sun
1564 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL);
1565 if (zv == NULL)
1566 return (SET_ERROR(ENXIO));
1567#else
1568 zv = dev->si_drv2;
1569#endif
1570
1571 volsize = zv->zv_volsize;
1572 if (uio->uio_resid > 0 &&
1573 (uio->uio_loffset < 0 || uio->uio_loffset > volsize))
1574 return (SET_ERROR(EIO));
1575
1576#ifdef illumos
1577 if (zv->zv_flags & ZVOL_DUMPIFIED) {
1578 error = physio(zvol_strategy, NULL, dev, B_READ,
1579 zvol_minphys, uio);
1580 return (error);
1581 }
1582#endif
1583
1584 rl = zfs_range_lock(&zv->zv_znode, uio->uio_loffset, uio->uio_resid,
1585 RL_READER);
1586 while (uio->uio_resid > 0 && uio->uio_loffset < volsize) {
1587 uint64_t bytes = MIN(uio->uio_resid, DMU_MAX_ACCESS >> 1);
1588
1589 /* don't read past the end */
1590 if (bytes > volsize - uio->uio_loffset)
1591 bytes = volsize - uio->uio_loffset;
1592
1593 error = dmu_read_uio(zv->zv_objset, ZVOL_OBJ, uio, bytes);
1594 if (error) {
1595 /* convert checksum errors into IO errors */
1596 if (error == ECKSUM)
1597 error = SET_ERROR(EIO);
1598 break;
1599 }
1600 }
1601 zfs_range_unlock(rl);
1602 return (error);
1603}
1604
1605#ifdef sun
1606/*ARGSUSED*/
1607int
1608zvol_write(dev_t dev, uio_t *uio, cred_t *cr)
1609{
1610 minor_t minor = getminor(dev);
1611#else
1612int
1613zvol_write(struct cdev *dev, struct uio *uio, int ioflag)
1614{
1615#endif
1616 zvol_state_t *zv;
1617 uint64_t volsize;
1618 rl_t *rl;
1619 int error = 0;
1620 boolean_t sync;
1621
1622#ifdef sun
1623 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL);
1624 if (zv == NULL)
1625 return (SET_ERROR(ENXIO));
1626#else
1627 zv = dev->si_drv2;
1628#endif
1629
1630 volsize = zv->zv_volsize;
1631 if (uio->uio_resid > 0 &&
1632 (uio->uio_loffset < 0 || uio->uio_loffset > volsize))
1633 return (SET_ERROR(EIO));
1634
1635#ifdef illumos
1636 if (zv->zv_flags & ZVOL_DUMPIFIED) {
1637 error = physio(zvol_strategy, NULL, dev, B_WRITE,
1638 zvol_minphys, uio);
1639 return (error);
1640 }
1641#endif
1642
1643#ifdef sun
1644 sync = !(zv->zv_flags & ZVOL_WCE) ||
1645#else
1646 sync = (ioflag & IO_SYNC) ||
1647#endif
1648 (zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS);
1649
1650 rl = zfs_range_lock(&zv->zv_znode, uio->uio_loffset, uio->uio_resid,
1651 RL_WRITER);
1652 while (uio->uio_resid > 0 && uio->uio_loffset < volsize) {
1653 uint64_t bytes = MIN(uio->uio_resid, DMU_MAX_ACCESS >> 1);
1654 uint64_t off = uio->uio_loffset;
1655 dmu_tx_t *tx = dmu_tx_create(zv->zv_objset);
1656
1657 if (bytes > volsize - off) /* don't write past the end */
1658 bytes = volsize - off;
1659
1660 dmu_tx_hold_write(tx, ZVOL_OBJ, off, bytes);
1661 error = dmu_tx_assign(tx, TXG_WAIT);
1662 if (error) {
1663 dmu_tx_abort(tx);
1664 break;
1665 }
1666 error = dmu_write_uio_dbuf(zv->zv_dbuf, uio, bytes, tx);
1667 if (error == 0)
1668 zvol_log_write(zv, tx, off, bytes, sync);
1669 dmu_tx_commit(tx);
1670
1671 if (error)
1672 break;
1673 }
1674 zfs_range_unlock(rl);
1675 if (sync)
1676 zil_commit(zv->zv_zilog, ZVOL_OBJ);
1677 return (error);
1678}
1679
1680#ifdef sun
1681int
1682zvol_getefi(void *arg, int flag, uint64_t vs, uint8_t bs)
1683{
1684 struct uuid uuid = EFI_RESERVED;
1685 efi_gpe_t gpe = { 0 };
1686 uint32_t crc;
1687 dk_efi_t efi;
1688 int length;
1689 char *ptr;
1690
1691 if (ddi_copyin(arg, &efi, sizeof (dk_efi_t), flag))
1692 return (SET_ERROR(EFAULT));
1693 ptr = (char *)(uintptr_t)efi.dki_data_64;
1694 length = efi.dki_length;
1695 /*
1696 * Some clients may attempt to request a PMBR for the
1697 * zvol. Currently this interface will return EINVAL to
1698 * such requests. These requests could be supported by
1699 * adding a check for lba == 0 and consing up an appropriate
1700 * PMBR.
1701 */
1702 if (efi.dki_lba < 1 || efi.dki_lba > 2 || length <= 0)
1703 return (SET_ERROR(EINVAL));
1704
1705 gpe.efi_gpe_StartingLBA = LE_64(34ULL);
1706 gpe.efi_gpe_EndingLBA = LE_64((vs >> bs) - 1);
1707 UUID_LE_CONVERT(gpe.efi_gpe_PartitionTypeGUID, uuid);
1708
1709 if (efi.dki_lba == 1) {
1710 efi_gpt_t gpt = { 0 };
1711
1712 gpt.efi_gpt_Signature = LE_64(EFI_SIGNATURE);
1713 gpt.efi_gpt_Revision = LE_32(EFI_VERSION_CURRENT);
1714 gpt.efi_gpt_HeaderSize = LE_32(sizeof (gpt));
1715 gpt.efi_gpt_MyLBA = LE_64(1ULL);
1716 gpt.efi_gpt_FirstUsableLBA = LE_64(34ULL);
1717 gpt.efi_gpt_LastUsableLBA = LE_64((vs >> bs) - 1);
1718 gpt.efi_gpt_PartitionEntryLBA = LE_64(2ULL);
1719 gpt.efi_gpt_NumberOfPartitionEntries = LE_32(1);
1720 gpt.efi_gpt_SizeOfPartitionEntry =
1721 LE_32(sizeof (efi_gpe_t));
1722 CRC32(crc, &gpe, sizeof (gpe), -1U, crc32_table);
1723 gpt.efi_gpt_PartitionEntryArrayCRC32 = LE_32(~crc);
1724 CRC32(crc, &gpt, sizeof (gpt), -1U, crc32_table);
1725 gpt.efi_gpt_HeaderCRC32 = LE_32(~crc);
1726 if (ddi_copyout(&gpt, ptr, MIN(sizeof (gpt), length),
1727 flag))
1728 return (SET_ERROR(EFAULT));
1729 ptr += sizeof (gpt);
1730 length -= sizeof (gpt);
1731 }
1732 if (length > 0 && ddi_copyout(&gpe, ptr, MIN(sizeof (gpe),
1733 length), flag))
1734 return (SET_ERROR(EFAULT));
1735 return (0);
1736}
1737
1738/*
1739 * BEGIN entry points to allow external callers access to the volume.
1740 */
1741/*
1742 * Return the volume parameters needed for access from an external caller.
1743 * These values are invariant as long as the volume is held open.
1744 */
1745int
1746zvol_get_volume_params(minor_t minor, uint64_t *blksize,
1747 uint64_t *max_xfer_len, void **minor_hdl, void **objset_hdl, void **zil_hdl,
1748 void **rl_hdl, void **bonus_hdl)
1749{
1750 zvol_state_t *zv;
1751
1752 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL);
1753 if (zv == NULL)
1754 return (SET_ERROR(ENXIO));
1755 if (zv->zv_flags & ZVOL_DUMPIFIED)
1756 return (SET_ERROR(ENXIO));
1757
1758 ASSERT(blksize && max_xfer_len && minor_hdl &&
1759 objset_hdl && zil_hdl && rl_hdl && bonus_hdl);
1760
1761 *blksize = zv->zv_volblocksize;
1762 *max_xfer_len = (uint64_t)zvol_maxphys;
1763 *minor_hdl = zv;
1764 *objset_hdl = zv->zv_objset;
1765 *zil_hdl = zv->zv_zilog;
1766 *rl_hdl = &zv->zv_znode;
1767 *bonus_hdl = zv->zv_dbuf;
1768 return (0);
1769}
1770
1771/*
1772 * Return the current volume size to an external caller.
1773 * The size can change while the volume is open.
1774 */
1775uint64_t
1776zvol_get_volume_size(void *minor_hdl)
1777{
1778 zvol_state_t *zv = minor_hdl;
1779
1780 return (zv->zv_volsize);
1781}
1782
1783/*
1784 * Return the current WCE setting to an external caller.
1785 * The WCE setting can change while the volume is open.
1786 */
1787int
1788zvol_get_volume_wce(void *minor_hdl)
1789{
1790 zvol_state_t *zv = minor_hdl;
1791
1792 return ((zv->zv_flags & ZVOL_WCE) ? 1 : 0);
1793}
1794
1795/*
1796 * Entry point for external callers to zvol_log_write
1797 */
1798void
1799zvol_log_write_minor(void *minor_hdl, dmu_tx_t *tx, offset_t off, ssize_t resid,
1800 boolean_t sync)
1801{
1802 zvol_state_t *zv = minor_hdl;
1803
1804 zvol_log_write(zv, tx, off, resid, sync);
1805}
1806/*
1807 * END entry points to allow external callers access to the volume.
1808 */
1809#endif /* sun */
1810
1811/*
1812 * Log a DKIOCFREE/free-long-range to the ZIL with TX_TRUNCATE.
1813 */
1814static void
1815zvol_log_truncate(zvol_state_t *zv, dmu_tx_t *tx, uint64_t off, uint64_t len,
1816 boolean_t sync)
1817{
1818 itx_t *itx;
1819 lr_truncate_t *lr;
1820 zilog_t *zilog = zv->zv_zilog;
1821
1822 if (zil_replaying(zilog, tx))
1823 return;
1824
1825 itx = zil_itx_create(TX_TRUNCATE, sizeof (*lr));
1826 lr = (lr_truncate_t *)&itx->itx_lr;
1827 lr->lr_foid = ZVOL_OBJ;
1828 lr->lr_offset = off;
1829 lr->lr_length = len;
1830
1831 itx->itx_sync = sync;
1832 zil_itx_assign(zilog, itx, tx);
1833}
1834
1835#ifdef sun
1836/*
1837 * Dirtbag ioctls to support mkfs(1M) for UFS filesystems. See dkio(7I).
1838 * Also a dirtbag dkio ioctl for unmap/free-block functionality.
1839 */
1840/*ARGSUSED*/
1841int
1842zvol_ioctl(dev_t dev, int cmd, intptr_t arg, int flag, cred_t *cr, int *rvalp)
1843{
1844 zvol_state_t *zv;
1845 struct dk_callback *dkc;
1846 int error = 0;
1847 rl_t *rl;
1848
1849 mutex_enter(&spa_namespace_lock);
1850
1851 zv = zfsdev_get_soft_state(getminor(dev), ZSST_ZVOL);
1852
1853 if (zv == NULL) {
1854 mutex_exit(&spa_namespace_lock);
1855 return (SET_ERROR(ENXIO));
1856 }
1857 ASSERT(zv->zv_total_opens > 0);
1858
1859 switch (cmd) {
1860
1861 case DKIOCINFO:
1862 {
1863 struct dk_cinfo dki;
1864
1865 bzero(&dki, sizeof (dki));
1866 (void) strcpy(dki.dki_cname, "zvol");
1867 (void) strcpy(dki.dki_dname, "zvol");
1868 dki.dki_ctype = DKC_UNKNOWN;
1869 dki.dki_unit = getminor(dev);
1870 dki.dki_maxtransfer =
1871 1 << (SPA_OLD_MAXBLOCKSHIFT - zv->zv_min_bs);
1872 mutex_exit(&spa_namespace_lock);
1873 if (ddi_copyout(&dki, (void *)arg, sizeof (dki), flag))
1874 error = SET_ERROR(EFAULT);
1875 return (error);
1876 }
1877
1878 case DKIOCGMEDIAINFO:
1879 {
1880 struct dk_minfo dkm;
1881
1882 bzero(&dkm, sizeof (dkm));
1883 dkm.dki_lbsize = 1U << zv->zv_min_bs;
1884 dkm.dki_capacity = zv->zv_volsize >> zv->zv_min_bs;
1885 dkm.dki_media_type = DK_UNKNOWN;
1886 mutex_exit(&spa_namespace_lock);
1887 if (ddi_copyout(&dkm, (void *)arg, sizeof (dkm), flag))
1888 error = SET_ERROR(EFAULT);
1889 return (error);
1890 }
1891
1892 case DKIOCGMEDIAINFOEXT:
1893 {
1894 struct dk_minfo_ext dkmext;
1895
1896 bzero(&dkmext, sizeof (dkmext));
1897 dkmext.dki_lbsize = 1U << zv->zv_min_bs;
1898 dkmext.dki_pbsize = zv->zv_volblocksize;
1899 dkmext.dki_capacity = zv->zv_volsize >> zv->zv_min_bs;
1900 dkmext.dki_media_type = DK_UNKNOWN;
1901 mutex_exit(&spa_namespace_lock);
1902 if (ddi_copyout(&dkmext, (void *)arg, sizeof (dkmext), flag))
1903 error = SET_ERROR(EFAULT);
1904 return (error);
1905 }
1906
1907 case DKIOCGETEFI:
1908 {
1909 uint64_t vs = zv->zv_volsize;
1910 uint8_t bs = zv->zv_min_bs;
1911
1912 mutex_exit(&spa_namespace_lock);
1913 error = zvol_getefi((void *)arg, flag, vs, bs);
1914 return (error);
1915 }
1916
1917 case DKIOCFLUSHWRITECACHE:
1918 dkc = (struct dk_callback *)arg;
1919 mutex_exit(&spa_namespace_lock);
1920 zil_commit(zv->zv_zilog, ZVOL_OBJ);
1921 if ((flag & FKIOCTL) && dkc != NULL && dkc->dkc_callback) {
1922 (*dkc->dkc_callback)(dkc->dkc_cookie, error);
1923 error = 0;
1924 }
1925 return (error);
1926
1927 case DKIOCGETWCE:
1928 {
1929 int wce = (zv->zv_flags & ZVOL_WCE) ? 1 : 0;
1930 if (ddi_copyout(&wce, (void *)arg, sizeof (int),
1931 flag))
1932 error = SET_ERROR(EFAULT);
1933 break;
1934 }
1935 case DKIOCSETWCE:
1936 {
1937 int wce;
1938 if (ddi_copyin((void *)arg, &wce, sizeof (int),
1939 flag)) {
1940 error = SET_ERROR(EFAULT);
1941 break;
1942 }
1943 if (wce) {
1944 zv->zv_flags |= ZVOL_WCE;
1945 mutex_exit(&spa_namespace_lock);
1946 } else {
1947 zv->zv_flags &= ~ZVOL_WCE;
1948 mutex_exit(&spa_namespace_lock);
1949 zil_commit(zv->zv_zilog, ZVOL_OBJ);
1950 }
1951 return (0);
1952 }
1953
1954 case DKIOCGGEOM:
1955 case DKIOCGVTOC:
1956 /*
1957 * commands using these (like prtvtoc) expect ENOTSUP
1958 * since we're emulating an EFI label
1959 */
1960 error = SET_ERROR(ENOTSUP);
1961 break;
1962
1963 case DKIOCDUMPINIT:
1964 rl = zfs_range_lock(&zv->zv_znode, 0, zv->zv_volsize,
1965 RL_WRITER);
1966 error = zvol_dumpify(zv);
1967 zfs_range_unlock(rl);
1968 break;
1969
1970 case DKIOCDUMPFINI:
1971 if (!(zv->zv_flags & ZVOL_DUMPIFIED))
1972 break;
1973 rl = zfs_range_lock(&zv->zv_znode, 0, zv->zv_volsize,
1974 RL_WRITER);
1975 error = zvol_dump_fini(zv);
1976 zfs_range_unlock(rl);
1977 break;
1978
1979 case DKIOCFREE:
1980 {
1981 dkioc_free_t df;
1982 dmu_tx_t *tx;
1983
1984 if (!zvol_unmap_enabled)
1985 break;
1986
1987 if (ddi_copyin((void *)arg, &df, sizeof (df), flag)) {
1988 error = SET_ERROR(EFAULT);
1989 break;
1990 }
1991
1992 /*
1993 * Apply Postel's Law to length-checking. If they overshoot,
1994 * just blank out until the end, if there's a need to blank
1995 * out anything.
1996 */
1997 if (df.df_start >= zv->zv_volsize)
1998 break; /* No need to do anything... */
1999
2000 mutex_exit(&spa_namespace_lock);
2001
2002 rl = zfs_range_lock(&zv->zv_znode, df.df_start, df.df_length,
2003 RL_WRITER);
2004 tx = dmu_tx_create(zv->zv_objset);
2005 dmu_tx_mark_netfree(tx);
2006 error = dmu_tx_assign(tx, TXG_WAIT);
2007 if (error != 0) {
2008 dmu_tx_abort(tx);
2009 } else {
2010 zvol_log_truncate(zv, tx, df.df_start,
2011 df.df_length, B_TRUE);
2012 dmu_tx_commit(tx);
2013 error = dmu_free_long_range(zv->zv_objset, ZVOL_OBJ,
2014 df.df_start, df.df_length);
2015 }
2016
2017 zfs_range_unlock(rl);
2018
2019 if (error == 0) {
2020 /*
2021 * If the write-cache is disabled or 'sync' property
2022 * is set to 'always' then treat this as a synchronous
2023 * operation (i.e. commit to zil).
2024 */
2025 if (!(zv->zv_flags & ZVOL_WCE) ||
2026 (zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS))
2027 zil_commit(zv->zv_zilog, ZVOL_OBJ);
2028
2029 /*
2030 * If the caller really wants synchronous writes, and
2031 * can't wait for them, don't return until the write
2032 * is done.
2033 */
2034 if (df.df_flags & DF_WAIT_SYNC) {
2035 txg_wait_synced(
2036 dmu_objset_pool(zv->zv_objset), 0);
2037 }
2038 }
2039 return (error);
2040 }
2041
2042 default:
2043 error = SET_ERROR(ENOTTY);
2044 break;
2045
2046 }
2047 mutex_exit(&spa_namespace_lock);
2048 return (error);
2049}
2050#endif /* sun */
2051
2052int
2053zvol_busy(void)
2054{
2055 return (zvol_minors != 0);
2056}
2057
2058void
2059zvol_init(void)
2060{
2061 VERIFY(ddi_soft_state_init(&zfsdev_state, sizeof (zfs_soft_state_t),
2062 1) == 0);
2063 ZFS_LOG(1, "ZVOL Initialized.");
2064}
2065
2066void
2067zvol_fini(void)
2068{
2069 ddi_soft_state_fini(&zfsdev_state);
2070 ZFS_LOG(1, "ZVOL Deinitialized.");
2071}
2072
2073#ifdef sun
2074/*ARGSUSED*/
2075static int
2076zfs_mvdev_dump_feature_check(void *arg, dmu_tx_t *tx)
2077{
2078 spa_t *spa = dmu_tx_pool(tx)->dp_spa;
2079
2080 if (spa_feature_is_active(spa, SPA_FEATURE_MULTI_VDEV_CRASH_DUMP))
2081 return (1);
2082 return (0);
2083}
2084
2085/*ARGSUSED*/
2086static void
2087zfs_mvdev_dump_activate_feature_sync(void *arg, dmu_tx_t *tx)
2088{
2089 spa_t *spa = dmu_tx_pool(tx)->dp_spa;
2090
2091 spa_feature_incr(spa, SPA_FEATURE_MULTI_VDEV_CRASH_DUMP, tx);
2092}
2093
2094static int
2095zvol_dump_init(zvol_state_t *zv, boolean_t resize)
2096{
2097 dmu_tx_t *tx;
2098 int error;
2099 objset_t *os = zv->zv_objset;
2100 spa_t *spa = dmu_objset_spa(os);
2101 vdev_t *vd = spa->spa_root_vdev;
2102 nvlist_t *nv = NULL;
2103 uint64_t version = spa_version(spa);
2104 enum zio_checksum checksum;
2105
2106 ASSERT(MUTEX_HELD(&spa_namespace_lock));
2107 ASSERT(vd->vdev_ops == &vdev_root_ops);
2108
2109 error = dmu_free_long_range(zv->zv_objset, ZVOL_OBJ, 0,
2110 DMU_OBJECT_END);
2111 /* wait for dmu_free_long_range to actually free the blocks */
2112 txg_wait_synced(dmu_objset_pool(zv->zv_objset), 0);
2113
2114 /*
2115 * If the pool on which the dump device is being initialized has more
2116 * than one child vdev, check that the MULTI_VDEV_CRASH_DUMP feature is
2117 * enabled. If so, bump that feature's counter to indicate that the
2118 * feature is active. We also check the vdev type to handle the
2119 * following case:
2120 * # zpool create test raidz disk1 disk2 disk3
2121 * Now have spa_root_vdev->vdev_children == 1 (the raidz vdev),
2122 * the raidz vdev itself has 3 children.
2123 */
2124 if (vd->vdev_children > 1 || vd->vdev_ops == &vdev_raidz_ops) {
2125 if (!spa_feature_is_enabled(spa,
2126 SPA_FEATURE_MULTI_VDEV_CRASH_DUMP))
2127 return (SET_ERROR(ENOTSUP));
2128 (void) dsl_sync_task(spa_name(spa),
2129 zfs_mvdev_dump_feature_check,
2130 zfs_mvdev_dump_activate_feature_sync, NULL,
2131 2, ZFS_SPACE_CHECK_RESERVED);
2132 }
2133
2134 tx = dmu_tx_create(os);
2135 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL);
2136 dmu_tx_hold_bonus(tx, ZVOL_OBJ);
2137 error = dmu_tx_assign(tx, TXG_WAIT);
2138 if (error) {
2139 dmu_tx_abort(tx);
2140 return (error);
2141 }
2142
2143 /*
2144 * If MULTI_VDEV_CRASH_DUMP is active, use the NOPARITY checksum
2145 * function. Otherwise, use the old default -- OFF.
2146 */
2147 checksum = spa_feature_is_active(spa,
2148 SPA_FEATURE_MULTI_VDEV_CRASH_DUMP) ? ZIO_CHECKSUM_NOPARITY :
2149 ZIO_CHECKSUM_OFF;
2150
2151 /*
2152 * If we are resizing the dump device then we only need to
2153 * update the refreservation to match the newly updated
2154 * zvolsize. Otherwise, we save off the original state of the
2155 * zvol so that we can restore them if the zvol is ever undumpified.
2156 */
2157 if (resize) {
2158 error = zap_update(os, ZVOL_ZAP_OBJ,
2159 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1,
2160 &zv->zv_volsize, tx);
2161 } else {
2162 uint64_t checksum, compress, refresrv, vbs, dedup;
2163
2164 error = dsl_prop_get_integer(zv->zv_name,
2165 zfs_prop_to_name(ZFS_PROP_COMPRESSION), &compress, NULL);
2166 error = error ? error : dsl_prop_get_integer(zv->zv_name,
2167 zfs_prop_to_name(ZFS_PROP_CHECKSUM), &checksum, NULL);
2168 error = error ? error : dsl_prop_get_integer(zv->zv_name,
2169 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &refresrv, NULL);
2170 error = error ? error : dsl_prop_get_integer(zv->zv_name,
2171 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &vbs, NULL);
2172 if (version >= SPA_VERSION_DEDUP) {
2173 error = error ? error :
2174 dsl_prop_get_integer(zv->zv_name,
2175 zfs_prop_to_name(ZFS_PROP_DEDUP), &dedup, NULL);
2176 }
2177
2178 error = error ? error : zap_update(os, ZVOL_ZAP_OBJ,
2179 zfs_prop_to_name(ZFS_PROP_COMPRESSION), 8, 1,
2180 &compress, tx);
2181 error = error ? error : zap_update(os, ZVOL_ZAP_OBJ,
2182 zfs_prop_to_name(ZFS_PROP_CHECKSUM), 8, 1, &checksum, tx);
2183 error = error ? error : zap_update(os, ZVOL_ZAP_OBJ,
2184 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1,
2185 &refresrv, tx);
2186 error = error ? error : zap_update(os, ZVOL_ZAP_OBJ,
2187 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), 8, 1,
2188 &vbs, tx);
2189 error = error ? error : dmu_object_set_blocksize(
2190 os, ZVOL_OBJ, SPA_OLD_MAXBLOCKSIZE, 0, tx);
2191 if (version >= SPA_VERSION_DEDUP) {
2192 error = error ? error : zap_update(os, ZVOL_ZAP_OBJ,
2193 zfs_prop_to_name(ZFS_PROP_DEDUP), 8, 1,
2194 &dedup, tx);
2195 }
2196 if (error == 0)
2197 zv->zv_volblocksize = SPA_OLD_MAXBLOCKSIZE;
2198 }
2199 dmu_tx_commit(tx);
2200
2201 /*
2202 * We only need update the zvol's property if we are initializing
2203 * the dump area for the first time.
2204 */
2205 if (!resize) {
2206 VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0);
2207 VERIFY(nvlist_add_uint64(nv,
2208 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 0) == 0);
2209 VERIFY(nvlist_add_uint64(nv,
2210 zfs_prop_to_name(ZFS_PROP_COMPRESSION),
2211 ZIO_COMPRESS_OFF) == 0);
2212 VERIFY(nvlist_add_uint64(nv,
2213 zfs_prop_to_name(ZFS_PROP_CHECKSUM),
2214 checksum) == 0);
2215 if (version >= SPA_VERSION_DEDUP) {
2216 VERIFY(nvlist_add_uint64(nv,
2217 zfs_prop_to_name(ZFS_PROP_DEDUP),
2218 ZIO_CHECKSUM_OFF) == 0);
2219 }
2220
2221 error = zfs_set_prop_nvlist(zv->zv_name, ZPROP_SRC_LOCAL,
2222 nv, NULL);
2223 nvlist_free(nv);
2224
2225 if (error)
2226 return (error);
2227 }
2228
2229 /* Allocate the space for the dump */
2230 error = zvol_prealloc(zv);
2231 return (error);
2232}
2233
2234static int
2235zvol_dumpify(zvol_state_t *zv)
2236{
2237 int error = 0;
2238 uint64_t dumpsize = 0;
2239 dmu_tx_t *tx;
2240 objset_t *os = zv->zv_objset;
2241
2242 if (zv->zv_flags & ZVOL_RDONLY)
2243 return (SET_ERROR(EROFS));
2244
2245 if (zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE,
2246 8, 1, &dumpsize) != 0 || dumpsize != zv->zv_volsize) {
2247 boolean_t resize = (dumpsize > 0);
2248
2249 if ((error = zvol_dump_init(zv, resize)) != 0) {
2250 (void) zvol_dump_fini(zv);
2251 return (error);
2252 }
2253 }
2254
2255 /*
2256 * Build up our lba mapping.
2257 */
2258 error = zvol_get_lbas(zv);
2259 if (error) {
2260 (void) zvol_dump_fini(zv);
2261 return (error);
2262 }
2263
2264 tx = dmu_tx_create(os);
2265 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL);
2266 error = dmu_tx_assign(tx, TXG_WAIT);
2267 if (error) {
2268 dmu_tx_abort(tx);
2269 (void) zvol_dump_fini(zv);
2270 return (error);
2271 }
2272
2273 zv->zv_flags |= ZVOL_DUMPIFIED;
2274 error = zap_update(os, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, 8, 1,
2275 &zv->zv_volsize, tx);
2276 dmu_tx_commit(tx);
2277
2278 if (error) {
2279 (void) zvol_dump_fini(zv);
2280 return (error);
2281 }
2282
2283 txg_wait_synced(dmu_objset_pool(os), 0);
2284 return (0);
2285}
2286
2287static int
2288zvol_dump_fini(zvol_state_t *zv)
2289{
2290 dmu_tx_t *tx;
2291 objset_t *os = zv->zv_objset;
2292 nvlist_t *nv;
2293 int error = 0;
2294 uint64_t checksum, compress, refresrv, vbs, dedup;
2295 uint64_t version = spa_version(dmu_objset_spa(zv->zv_objset));
2296
2297 /*
2298 * Attempt to restore the zvol back to its pre-dumpified state.
2299 * This is a best-effort attempt as it's possible that not all
2300 * of these properties were initialized during the dumpify process
2301 * (i.e. error during zvol_dump_init).
2302 */
2303
2304 tx = dmu_tx_create(os);
2305 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL);
2306 error = dmu_tx_assign(tx, TXG_WAIT);
2307 if (error) {
2308 dmu_tx_abort(tx);
2309 return (error);
2310 }
2311 (void) zap_remove(os, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, tx);
2312 dmu_tx_commit(tx);
2313
2314 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ,
2315 zfs_prop_to_name(ZFS_PROP_CHECKSUM), 8, 1, &checksum);
2316 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ,
2317 zfs_prop_to_name(ZFS_PROP_COMPRESSION), 8, 1, &compress);
2318 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ,
2319 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1, &refresrv);
2320 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ,
2321 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), 8, 1, &vbs);
2322
2323 VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0);
2324 (void) nvlist_add_uint64(nv,
2325 zfs_prop_to_name(ZFS_PROP_CHECKSUM), checksum);
2326 (void) nvlist_add_uint64(nv,
2327 zfs_prop_to_name(ZFS_PROP_COMPRESSION), compress);
2328 (void) nvlist_add_uint64(nv,
2329 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), refresrv);
2330 if (version >= SPA_VERSION_DEDUP &&
2331 zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ,
2332 zfs_prop_to_name(ZFS_PROP_DEDUP), 8, 1, &dedup) == 0) {
2333 (void) nvlist_add_uint64(nv,
2334 zfs_prop_to_name(ZFS_PROP_DEDUP), dedup);
2335 }
2336 (void) zfs_set_prop_nvlist(zv->zv_name, ZPROP_SRC_LOCAL,
2337 nv, NULL);
2338 nvlist_free(nv);
2339
2340 zvol_free_extents(zv);
2341 zv->zv_flags &= ~ZVOL_DUMPIFIED;
2342 (void) dmu_free_long_range(os, ZVOL_OBJ, 0, DMU_OBJECT_END);
2343 /* wait for dmu_free_long_range to actually free the blocks */
2344 txg_wait_synced(dmu_objset_pool(zv->zv_objset), 0);
2345 tx = dmu_tx_create(os);
2346 dmu_tx_hold_bonus(tx, ZVOL_OBJ);
2347 error = dmu_tx_assign(tx, TXG_WAIT);
2348 if (error) {
2349 dmu_tx_abort(tx);
2350 return (error);
2351 }
2352 if (dmu_object_set_blocksize(os, ZVOL_OBJ, vbs, 0, tx) == 0)
2353 zv->zv_volblocksize = vbs;
2354 dmu_tx_commit(tx);
2355
2356 return (0);
2357}
2358#endif /* sun */
2359
2360static void
2361zvol_geom_run(zvol_state_t *zv)
2362{
2363 struct g_provider *pp;
2364
2365 pp = zv->zv_provider;
2366 g_error_provider(pp, 0);
2367
2368 kproc_kthread_add(zvol_geom_worker, zv, &zfsproc, NULL, 0, 0,
2369 "zfskern", "zvol %s", pp->name + sizeof(ZVOL_DRIVER));
2370}
2371
2372static void
2373zvol_geom_destroy(zvol_state_t *zv)
2374{
2375 struct g_provider *pp;
2376
2377 g_topology_assert();
2378
2379 mtx_lock(&zv->zv_queue_mtx);
2380 zv->zv_state = 1;
2381 wakeup_one(&zv->zv_queue);
2382 while (zv->zv_state != 2)
2383 msleep(&zv->zv_state, &zv->zv_queue_mtx, 0, "zvol:w", 0);
2384 mtx_destroy(&zv->zv_queue_mtx);
2385
2386 pp = zv->zv_provider;
2387 zv->zv_provider = NULL;
2388 pp->private = NULL;
2389 g_wither_geom(pp->geom, ENXIO);
2390}
2391
2392static int
2393zvol_geom_access(struct g_provider *pp, int acr, int acw, int ace)
2394{
2395 int count, error, flags;
2396
2397 g_topology_assert();
2398
2399 /*
2400 * To make it easier we expect either open or close, but not both
2401 * at the same time.
2402 */
2403 KASSERT((acr >= 0 && acw >= 0 && ace >= 0) ||
2404 (acr <= 0 && acw <= 0 && ace <= 0),
2405 ("Unsupported access request to %s (acr=%d, acw=%d, ace=%d).",
2406 pp->name, acr, acw, ace));
2407
2408 if (pp->private == NULL) {
2409 if (acr <= 0 && acw <= 0 && ace <= 0)
2410 return (0);
2411 return (pp->error);
2412 }
2413
2414 /*
2415 * We don't pass FEXCL flag to zvol_open()/zvol_close() if ace != 0,
2416 * because GEOM already handles that and handles it a bit differently.
2417 * GEOM allows for multiple read/exclusive consumers and ZFS allows
2418 * only one exclusive consumer, no matter if it is reader or writer.
2419 * I like better the way GEOM works so I'll leave it for GEOM to
2420 * decide what to do.
2421 */
2422
2423 count = acr + acw + ace;
2424 if (count == 0)
2425 return (0);
2426
2427 flags = 0;
2428 if (acr != 0 || ace != 0)
2429 flags |= FREAD;
2430 if (acw != 0)
2431 flags |= FWRITE;
2432
2433 g_topology_unlock();
2434 if (count > 0)
2435 error = zvol_open(pp, flags, count);
2436 else
2437 error = zvol_close(pp, flags, -count);
2438 g_topology_lock();
2439 return (error);
2440}
2441
2442static void
2443zvol_geom_start(struct bio *bp)
2444{
2445 zvol_state_t *zv;
2446 boolean_t first;
2447
2448 zv = bp->bio_to->private;
2449 ASSERT(zv != NULL);
2450 switch (bp->bio_cmd) {
2451 case BIO_FLUSH:
2452 if (!THREAD_CAN_SLEEP())
2453 goto enqueue;
2454 zil_commit(zv->zv_zilog, ZVOL_OBJ);
2455 g_io_deliver(bp, 0);
2456 break;
2457 case BIO_READ:
2458 case BIO_WRITE:
2459 case BIO_DELETE:
2460 if (!THREAD_CAN_SLEEP())
2461 goto enqueue;
2462 zvol_strategy(bp);
2463 break;
2464 case BIO_GETATTR: {
2465 spa_t *spa = dmu_objset_spa(zv->zv_objset);
2466 uint64_t refd, avail, usedobjs, availobjs, val;
2467
2468 if (g_handleattr_int(bp, "GEOM::candelete", 1))
2469 return;
2470 if (strcmp(bp->bio_attribute, "blocksavail") == 0) {
2471 dmu_objset_space(zv->zv_objset, &refd, &avail,
2472 &usedobjs, &availobjs);
2473 if (g_handleattr_off_t(bp, "blocksavail",
2474 avail / DEV_BSIZE))
2475 return;
2476 } else if (strcmp(bp->bio_attribute, "blocksused") == 0) {
2477 dmu_objset_space(zv->zv_objset, &refd, &avail,
2478 &usedobjs, &availobjs);
2479 if (g_handleattr_off_t(bp, "blocksused",
2480 refd / DEV_BSIZE))
2481 return;
2482 } else if (strcmp(bp->bio_attribute, "poolblocksavail") == 0) {
2483 avail = metaslab_class_get_space(spa_normal_class(spa));
2484 avail -= metaslab_class_get_alloc(spa_normal_class(spa));
2485 if (g_handleattr_off_t(bp, "poolblocksavail",
2486 avail / DEV_BSIZE))
2487 return;
2488 } else if (strcmp(bp->bio_attribute, "poolblocksused") == 0) {
2489 refd = metaslab_class_get_alloc(spa_normal_class(spa));
2490 if (g_handleattr_off_t(bp, "poolblocksused",
2491 refd / DEV_BSIZE))
2492 return;
2493 }
2494 /* FALLTHROUGH */
2495 }
2496 default:
2497 g_io_deliver(bp, EOPNOTSUPP);
2498 break;
2499 }
2500 return;
2501
2502enqueue:
2503 mtx_lock(&zv->zv_queue_mtx);
2504 first = (bioq_first(&zv->zv_queue) == NULL);
2505 bioq_insert_tail(&zv->zv_queue, bp);
2506 mtx_unlock(&zv->zv_queue_mtx);
2507 if (first)
2508 wakeup_one(&zv->zv_queue);
2509}
2510
2511static void
2512zvol_geom_worker(void *arg)
2513{
2514 zvol_state_t *zv;
2515 struct bio *bp;
2516
2517 thread_lock(curthread);
2518 sched_prio(curthread, PRIBIO);
2519 thread_unlock(curthread);
2520
2521 zv = arg;
2522 for (;;) {
2523 mtx_lock(&zv->zv_queue_mtx);
2524 bp = bioq_takefirst(&zv->zv_queue);
2525 if (bp == NULL) {
2526 if (zv->zv_state == 1) {
2527 zv->zv_state = 2;
2528 wakeup(&zv->zv_state);
2529 mtx_unlock(&zv->zv_queue_mtx);
2530 kthread_exit();
2531 }
2532 msleep(&zv->zv_queue, &zv->zv_queue_mtx, PRIBIO | PDROP,
2533 "zvol:io", 0);
2534 continue;
2535 }
2536 mtx_unlock(&zv->zv_queue_mtx);
2537 switch (bp->bio_cmd) {
2538 case BIO_FLUSH:
2539 zil_commit(zv->zv_zilog, ZVOL_OBJ);
2540 g_io_deliver(bp, 0);
2541 break;
2542 case BIO_READ:
2543 case BIO_WRITE:
2544 zvol_strategy(bp);
2545 break;
2546 }
2547 }
2548}
2549
2550extern boolean_t dataset_name_hidden(const char *name);
2551
2552static int
2553zvol_create_snapshots(objset_t *os, const char *name)
2554{
2555 uint64_t cookie, obj;
2556 char *sname;
2557 int error, len;
2558
2559 cookie = obj = 0;
2560 sname = kmem_alloc(MAXPATHLEN, KM_SLEEP);
2561
2562#if 0
2563 (void) dmu_objset_find(name, dmu_objset_prefetch, NULL,
2564 DS_FIND_SNAPSHOTS);
2565#endif
2566
2567 for (;;) {
2568 len = snprintf(sname, MAXPATHLEN, "%s@", name);
2569 if (len >= MAXPATHLEN) {
2570 dmu_objset_rele(os, FTAG);
2571 error = ENAMETOOLONG;
2572 break;
2573 }
2574
2575 dsl_pool_config_enter(dmu_objset_pool(os), FTAG);
2576 error = dmu_snapshot_list_next(os, MAXPATHLEN - len,
2577 sname + len, &obj, &cookie, NULL);
2578 dsl_pool_config_exit(dmu_objset_pool(os), FTAG);
2579 if (error != 0) {
2580 if (error == ENOENT)
2581 error = 0;
2582 break;
2583 }
2584
2585 if ((error = zvol_create_minor(sname)) != 0) {
2586 printf("ZFS WARNING: Unable to create ZVOL %s (error=%d).\n",
2587 sname, error);
2588 break;
2589 }
2590 }
2591
2592 kmem_free(sname, MAXPATHLEN);
2593 return (error);
2594}
2595
2596int
2597zvol_create_minors(const char *name)
2598{
2599 uint64_t cookie;
2600 objset_t *os;
2601 char *osname, *p;
2602 int error, len;
2603
2604 if (dataset_name_hidden(name))
2605 return (0);
2606
2607 if ((error = dmu_objset_hold(name, FTAG, &os)) != 0) {
2608 printf("ZFS WARNING: Unable to put hold on %s (error=%d).\n",
2609 name, error);
2610 return (error);
2611 }
2612 if (dmu_objset_type(os) == DMU_OST_ZVOL) {
2613 dsl_dataset_long_hold(os->os_dsl_dataset, FTAG);
2614 dsl_pool_rele(dmu_objset_pool(os), FTAG);
2615 error = zvol_create_minor(name);
2616 if (error == 0 || error == EEXIST) {
2617 error = zvol_create_snapshots(os, name);
2618 } else {
2619 printf("ZFS WARNING: Unable to create ZVOL %s (error=%d).\n",
2620 name, error);
2621 }
2622 dsl_dataset_long_rele(os->os_dsl_dataset, FTAG);
2623 dsl_dataset_rele(os->os_dsl_dataset, FTAG);
2624 return (error);
2625 }
2626 if (dmu_objset_type(os) != DMU_OST_ZFS) {
2627 dmu_objset_rele(os, FTAG);
2628 return (0);
2629 }
2630
2631 osname = kmem_alloc(MAXPATHLEN, KM_SLEEP);
2632 if (snprintf(osname, MAXPATHLEN, "%s/", name) >= MAXPATHLEN) {
2633 dmu_objset_rele(os, FTAG);
2634 kmem_free(osname, MAXPATHLEN);
2635 return (ENOENT);
2636 }
2637 p = osname + strlen(osname);
2638 len = MAXPATHLEN - (p - osname);
2639
2640#if 0
2641 /* Prefetch the datasets. */
2642 cookie = 0;
2643 while (dmu_dir_list_next(os, len, p, NULL, &cookie) == 0) {
2644 if (!dataset_name_hidden(osname))
2645 (void) dmu_objset_prefetch(osname, NULL);
2646 }
2647#endif
2648
2649 cookie = 0;
2650 while (dmu_dir_list_next(os, MAXPATHLEN - (p - osname), p, NULL,
2651 &cookie) == 0) {
2652 dmu_objset_rele(os, FTAG);
2653 (void)zvol_create_minors(osname);
2654 if ((error = dmu_objset_hold(name, FTAG, &os)) != 0) {
2655 printf("ZFS WARNING: Unable to put hold on %s (error=%d).\n",
2656 name, error);
2657 return (error);
2658 }
2659 }
2660
2661 dmu_objset_rele(os, FTAG);
2662 kmem_free(osname, MAXPATHLEN);
2663 return (0);
2664}
2665
2666static void
2667zvol_rename_minor(zvol_state_t *zv, const char *newname)
2668{
2669 struct g_geom *gp;
2670 struct g_provider *pp;
2671 struct cdev *dev;
2672
2673 ASSERT(MUTEX_HELD(&spa_namespace_lock));
2674
2675 if (zv->zv_volmode == ZFS_VOLMODE_GEOM) {
2676 g_topology_lock();
2677 pp = zv->zv_provider;
2678 ASSERT(pp != NULL);
2679 gp = pp->geom;
2680 ASSERT(gp != NULL);
2681
2682 zv->zv_provider = NULL;
2683 g_wither_provider(pp, ENXIO);
2684
2685 pp = g_new_providerf(gp, "%s/%s", ZVOL_DRIVER, newname);
2686 pp->flags |= G_PF_DIRECT_RECEIVE | G_PF_DIRECT_SEND;
2687 pp->sectorsize = DEV_BSIZE;
2688 pp->mediasize = zv->zv_volsize;
2689 pp->private = zv;
2690 zv->zv_provider = pp;
2691 g_error_provider(pp, 0);
2692 g_topology_unlock();
2693 } else if (zv->zv_volmode == ZFS_VOLMODE_DEV) {
2694 dev = zv->zv_dev;
2695 ASSERT(dev != NULL);
2696 zv->zv_dev = NULL;
2697 destroy_dev(dev);
2698
2699 if (make_dev_p(MAKEDEV_CHECKNAME | MAKEDEV_WAITOK,
2700 &dev, &zvol_cdevsw, NULL, UID_ROOT, GID_OPERATOR,
2701 0640, "%s/%s", ZVOL_DRIVER, newname) == 0) {
2702 zv->zv_dev = dev;
2703 dev->si_iosize_max = MAXPHYS;
2704 dev->si_drv2 = zv;
2705 }
2706 }
2707 strlcpy(zv->zv_name, newname, sizeof(zv->zv_name));
2708}
2709
2710void
2711zvol_rename_minors(const char *oldname, const char *newname)
2712{
2713 char name[MAXPATHLEN];
2714 struct g_provider *pp;
2715 struct g_geom *gp;
2716 size_t oldnamelen, newnamelen;
2717 zvol_state_t *zv;
2718 char *namebuf;
2719 boolean_t locked = B_FALSE;
2720
2721 oldnamelen = strlen(oldname);
2722 newnamelen = strlen(newname);
2723
2724 DROP_GIANT();
2725 /* See comment in zvol_open(). */
2726 if (!MUTEX_HELD(&spa_namespace_lock)) {
2727 mutex_enter(&spa_namespace_lock);
2728 locked = B_TRUE;
2729 }
2730
2731 LIST_FOREACH(zv, &all_zvols, zv_links) {
2732 if (strcmp(zv->zv_name, oldname) == 0) {
2733 zvol_rename_minor(zv, newname);
2734 } else if (strncmp(zv->zv_name, oldname, oldnamelen) == 0 &&
2735 (zv->zv_name[oldnamelen] == '/' ||
2736 zv->zv_name[oldnamelen] == '@')) {
2737 snprintf(name, sizeof(name), "%s%c%s", newname,
2738 zv->zv_name[oldnamelen],
2739 zv->zv_name + oldnamelen + 1);
2740 zvol_rename_minor(zv, name);
2741 }
2742 }
2743
2744 if (locked)
2745 mutex_exit(&spa_namespace_lock);
2746 PICKUP_GIANT();
2747}
2748
2749static int
2750zvol_d_open(struct cdev *dev, int flags, int fmt, struct thread *td)
2751{
2752 zvol_state_t *zv;
2753 int err = 0;
2754
2755 mutex_enter(&spa_namespace_lock);
2756 zv = dev->si_drv2;
2757 if (zv == NULL) {
2758 mutex_exit(&spa_namespace_lock);
2759 return(ENXIO); /* zvol_create_minor() not done yet */
2760 }
2761
2762 if (zv->zv_total_opens == 0)
2763 err = zvol_first_open(zv);
2764 if (err) {
2765 mutex_exit(&spa_namespace_lock);
2766 return (err);
2767 }
2768 if ((flags & FWRITE) && (zv->zv_flags & ZVOL_RDONLY)) {
2769 err = SET_ERROR(EROFS);
2770 goto out;
2771 }
2772 if (zv->zv_flags & ZVOL_EXCL) {
2773 err = SET_ERROR(EBUSY);
2774 goto out;
2775 }
2776#ifdef FEXCL
2777 if (flags & FEXCL) {
2778 if (zv->zv_total_opens != 0) {
2779 err = SET_ERROR(EBUSY);
2780 goto out;
2781 }
2782 zv->zv_flags |= ZVOL_EXCL;
2783 }
2784#endif
2785
2786 zv->zv_total_opens++;
2787 mutex_exit(&spa_namespace_lock);
2788 return (err);
2789out:
2790 if (zv->zv_total_opens == 0)
2791 zvol_last_close(zv);
2792 mutex_exit(&spa_namespace_lock);
2793 return (err);
2794}
2795
2796static int
2797zvol_d_close(struct cdev *dev, int flags, int fmt, struct thread *td)
2798{
2799 zvol_state_t *zv;
2800 int err = 0;
2801
2802 mutex_enter(&spa_namespace_lock);
2803 zv = dev->si_drv2;
2804 if (zv == NULL) {
2805 mutex_exit(&spa_namespace_lock);
2806 return(ENXIO);
2807 }
2808
2809 if (zv->zv_flags & ZVOL_EXCL) {
2810 ASSERT(zv->zv_total_opens == 1);
2811 zv->zv_flags &= ~ZVOL_EXCL;
2812 }
2813
2814 /*
2815 * If the open count is zero, this is a spurious close.
2816 * That indicates a bug in the kernel / DDI framework.
2817 */
2818 ASSERT(zv->zv_total_opens != 0);
2819
2820 /*
2821 * You may get multiple opens, but only one close.
2822 */
2823 zv->zv_total_opens--;
2824
2825 if (zv->zv_total_opens == 0)
2826 zvol_last_close(zv);
2827
2828 mutex_exit(&spa_namespace_lock);
2829 return (0);
2830}
2831
2832static int
2833zvol_d_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td)
2834{
2835 zvol_state_t *zv;
2836 rl_t *rl;
2837 off_t offset, length, chunk;
2838 int i, error;
2839 u_int u;
2840
2841 zv = dev->si_drv2;
2842
2843 error = 0;
2844 KASSERT(zv->zv_total_opens > 0,
2845 ("Device with zero access count in zvol_d_ioctl"));
2846
2847 i = IOCPARM_LEN(cmd);
2848 switch (cmd) {
2849 case DIOCGSECTORSIZE:
2850 *(u_int *)data = DEV_BSIZE;
2851 break;
2852 case DIOCGMEDIASIZE:
2853 *(off_t *)data = zv->zv_volsize;
2854 break;
2855 case DIOCGFLUSH:
2856 zil_commit(zv->zv_zilog, ZVOL_OBJ);
2857 break;
2858 case DIOCGDELETE:
2859 if (!zvol_unmap_enabled)
2860 break;
2861
2862 offset = ((off_t *)data)[0];
2863 length = ((off_t *)data)[1];
2864 if ((offset % DEV_BSIZE) != 0 || (length % DEV_BSIZE) != 0 ||
2865 offset < 0 || offset >= zv->zv_volsize ||
2866 length <= 0) {
2867 printf("%s: offset=%jd length=%jd\n", __func__, offset,
2868 length);
2869 error = EINVAL;
2870 break;
2871 }
2872
2873 rl = zfs_range_lock(&zv->zv_znode, offset, length, RL_WRITER);
2874 dmu_tx_t *tx = dmu_tx_create(zv->zv_objset);
2875 error = dmu_tx_assign(tx, TXG_WAIT);
2876 if (error != 0) {
2877 dmu_tx_abort(tx);
2878 } else {
2879 zvol_log_truncate(zv, tx, offset, length, B_TRUE);
2880 dmu_tx_commit(tx);
2881 error = dmu_free_long_range(zv->zv_objset, ZVOL_OBJ,
2882 offset, length);
2883 }
2884 zfs_range_unlock(rl);
2885 if (zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS)
2886 zil_commit(zv->zv_zilog, ZVOL_OBJ);
2887 break;
2888 case DIOCGSTRIPESIZE:
2889 *(off_t *)data = zv->zv_volblocksize;
2890 break;
2891 case DIOCGSTRIPEOFFSET:
2892 *(off_t *)data = 0;
2893 break;
2894 case DIOCGATTR: {
2895 spa_t *spa = dmu_objset_spa(zv->zv_objset);
2896 struct diocgattr_arg *arg = (struct diocgattr_arg *)data;
2897 uint64_t refd, avail, usedobjs, availobjs;
2898
2899 if (strcmp(arg->name, "blocksavail") == 0) {
2900 dmu_objset_space(zv->zv_objset, &refd, &avail,
2901 &usedobjs, &availobjs);
2902 arg->value.off = avail / DEV_BSIZE;
2903 } else if (strcmp(arg->name, "blocksused") == 0) {
2904 dmu_objset_space(zv->zv_objset, &refd, &avail,
2905 &usedobjs, &availobjs);
2906 arg->value.off = refd / DEV_BSIZE;
2907 } else if (strcmp(arg->name, "poolblocksavail") == 0) {
2908 avail = metaslab_class_get_space(spa_normal_class(spa));
2909 avail -= metaslab_class_get_alloc(spa_normal_class(spa));
2910 arg->value.off = avail / DEV_BSIZE;
2911 } else if (strcmp(arg->name, "poolblocksused") == 0) {
2912 refd = metaslab_class_get_alloc(spa_normal_class(spa));
2913 arg->value.off = refd / DEV_BSIZE;
2914 } else
2915 error = ENOIOCTL;
2916 break;
2917 }
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