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.
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.
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]
22 * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
27 * ZFS volume emulation driver.
29 * Makes a DMU object look like a volume of arbitrary size, up to 2^64 bytes.
30 * Volumes are accessed through the symbolic links named:
32 * /dev/zvol/dsk/<pool_name>/<dataset_name>
33 * /dev/zvol/rdsk/<pool_name>/<dataset_name>
35 * These links are created by the ZFS-specific devfsadm link generator.
36 * Volumes are persistent through reboot. No user command needs to be
37 * run before opening and using a device.
40 #include <sys/types.h>
41 #include <sys/param.h>
42 #include <sys/errno.h>
45 #include <sys/modctl.h>
49 #include <sys/cmn_err.h>
54 #include <sys/dmu_traverse.h>
55 #include <sys/dnode.h>
56 #include <sys/dsl_dataset.h>
57 #include <sys/dsl_prop.h>
59 #include <sys/efi_partition.h>
60 #include <sys/byteorder.h>
61 #include <sys/pathname.h>
63 #include <sys/sunddi.h>
64 #include <sys/crc32.h>
65 #include <sys/dirent.h>
66 #include <sys/policy.h>
67 #include <sys/fs/zfs.h>
68 #include <sys/zfs_ioctl.h>
69 #include <sys/mkdev.h>
71 #include <sys/refcount.h>
72 #include <sys/zfs_znode.h>
73 #include <sys/zfs_rlock.h>
74 #include <sys/vdev_disk.h>
75 #include <sys/vdev_impl.h>
77 #include <sys/dumphdr.h>
79 #include "zfs_namecheck.h"
81 static void *zvol_state;
83 #define ZVOL_DUMPSIZE "dumpsize"
86 * This lock protects the zvol_state structure from being modified
87 * while it's being used, e.g. an open that comes in before a create
88 * finishes. It also protects temporary opens of the dataset so that,
89 * e.g., an open doesn't get a spurious EBUSY.
91 static kmutex_t zvol_state_lock;
92 static uint32_t zvol_minors;
94 typedef struct zvol_extent {
96 dva_t ze_dva; /* dva associated with this extent */
97 uint64_t ze_nblks; /* number of blocks in extent */
101 * The in-core state of each volume.
103 typedef struct zvol_state {
104 char zv_name[MAXPATHLEN]; /* pool/dd name */
105 uint64_t zv_volsize; /* amount of space we advertise */
106 uint64_t zv_volblocksize; /* volume block size */
107 minor_t zv_minor; /* minor number */
108 uint8_t zv_min_bs; /* minimum addressable block shift */
109 uint8_t zv_flags; /* readonly; dumpified */
110 objset_t *zv_objset; /* objset handle */
111 uint32_t zv_mode; /* DS_MODE_* flags at open time */
112 uint32_t zv_open_count[OTYPCNT]; /* open counts */
113 uint32_t zv_total_opens; /* total open count */
114 zilog_t *zv_zilog; /* ZIL handle */
115 list_t zv_extents; /* List of extents for dump */
116 uint64_t zv_txg_assign; /* txg to assign during ZIL replay */
117 znode_t zv_znode; /* for range locking */
121 * zvol specific flags
123 #define ZVOL_RDONLY 0x1
124 #define ZVOL_DUMPIFIED 0x2
125 #define ZVOL_EXCL 0x4
128 * zvol maximum transfer in one DMU tx.
130 int zvol_maxphys = DMU_MAX_ACCESS/2;
132 extern int zfs_set_prop_nvlist(const char *, nvlist_t *);
133 static int zvol_get_data(void *arg, lr_write_t *lr, char *buf, zio_t *zio);
134 static int zvol_dumpify(zvol_state_t *zv);
135 static int zvol_dump_fini(zvol_state_t *zv);
136 static int zvol_dump_init(zvol_state_t *zv, boolean_t resize);
139 zvol_size_changed(zvol_state_t *zv, major_t maj)
141 dev_t dev = makedevice(maj, zv->zv_minor);
143 VERIFY(ddi_prop_update_int64(dev, zfs_dip,
144 "Size", zv->zv_volsize) == DDI_SUCCESS);
145 VERIFY(ddi_prop_update_int64(dev, zfs_dip,
146 "Nblocks", lbtodb(zv->zv_volsize)) == DDI_SUCCESS);
148 /* Notify specfs to invalidate the cached size */
149 spec_size_invalidate(dev, VBLK);
150 spec_size_invalidate(dev, VCHR);
154 zvol_check_volsize(uint64_t volsize, uint64_t blocksize)
159 if (volsize % blocksize != 0)
163 if (volsize - 1 > SPEC_MAXOFFSET_T)
170 zvol_check_volblocksize(uint64_t volblocksize)
172 if (volblocksize < SPA_MINBLOCKSIZE ||
173 volblocksize > SPA_MAXBLOCKSIZE ||
181 zvol_readonly_changed_cb(void *arg, uint64_t newval)
183 zvol_state_t *zv = arg;
186 zv->zv_flags |= ZVOL_RDONLY;
188 zv->zv_flags &= ~ZVOL_RDONLY;
192 zvol_get_stats(objset_t *os, nvlist_t *nv)
195 dmu_object_info_t doi;
199 error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &val);
203 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLSIZE, val);
205 error = dmu_object_info(os, ZVOL_OBJ, &doi);
208 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLBLOCKSIZE,
209 doi.doi_data_block_size);
216 * Find a free minor number.
219 zvol_minor_alloc(void)
223 ASSERT(MUTEX_HELD(&zvol_state_lock));
225 for (minor = 1; minor <= ZVOL_MAX_MINOR; minor++)
226 if (ddi_get_soft_state(zvol_state, minor) == NULL)
232 static zvol_state_t *
233 zvol_minor_lookup(const char *name)
238 ASSERT(MUTEX_HELD(&zvol_state_lock));
240 for (minor = 1; minor <= ZVOL_MAX_MINOR; minor++) {
241 zv = ddi_get_soft_state(zvol_state, minor);
244 if (strcmp(zv->zv_name, name) == 0)
251 /* extent mapping arg */
259 zvol_map_block(spa_t *spa, blkptr_t *bp, const zbookmark_t *zb,
260 const dnode_phys_t *dnp, void *arg)
262 struct maparg *ma = arg;
264 int bs = ma->ma_zv->zv_volblocksize;
266 if (bp == NULL || zb->zb_object != ZVOL_OBJ || zb->zb_level != 0)
269 VERIFY3U(ma->ma_blks, ==, zb->zb_blkid);
272 /* Abort immediately if we have encountered gang blocks */
277 * See if the block is at the end of the previous extent.
279 ze = list_tail(&ma->ma_zv->zv_extents);
281 DVA_GET_VDEV(BP_IDENTITY(bp)) == DVA_GET_VDEV(&ze->ze_dva) &&
282 DVA_GET_OFFSET(BP_IDENTITY(bp)) ==
283 DVA_GET_OFFSET(&ze->ze_dva) + ze->ze_nblks * bs) {
288 dprintf_bp(bp, "%s", "next blkptr:");
290 /* start a new extent */
291 ze = kmem_zalloc(sizeof (zvol_extent_t), KM_SLEEP);
292 ze->ze_dva = bp->blk_dva[0]; /* structure assignment */
294 list_insert_tail(&ma->ma_zv->zv_extents, ze);
299 zvol_free_extents(zvol_state_t *zv)
303 while (ze = list_head(&zv->zv_extents)) {
304 list_remove(&zv->zv_extents, ze);
305 kmem_free(ze, sizeof (zvol_extent_t));
310 zvol_get_lbas(zvol_state_t *zv)
317 zvol_free_extents(zv);
319 err = traverse_dataset(dmu_objset_ds(zv->zv_objset), 0,
320 TRAVERSE_PRE | TRAVERSE_PREFETCH_METADATA, zvol_map_block, &ma);
321 if (err || ma.ma_blks != (zv->zv_volsize / zv->zv_volblocksize)) {
322 zvol_free_extents(zv);
323 return (err ? err : EIO);
331 zvol_create_cb(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx)
333 zfs_creat_t *zct = arg;
334 nvlist_t *nvprops = zct->zct_props;
336 uint64_t volblocksize, volsize;
338 VERIFY(nvlist_lookup_uint64(nvprops,
339 zfs_prop_to_name(ZFS_PROP_VOLSIZE), &volsize) == 0);
340 if (nvlist_lookup_uint64(nvprops,
341 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &volblocksize) != 0)
342 volblocksize = zfs_prop_default_numeric(ZFS_PROP_VOLBLOCKSIZE);
345 * These properties must be removed from the list so the generic
346 * property setting step won't apply to them.
348 VERIFY(nvlist_remove_all(nvprops,
349 zfs_prop_to_name(ZFS_PROP_VOLSIZE)) == 0);
350 (void) nvlist_remove_all(nvprops,
351 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE));
353 error = dmu_object_claim(os, ZVOL_OBJ, DMU_OT_ZVOL, volblocksize,
357 error = zap_create_claim(os, ZVOL_ZAP_OBJ, DMU_OT_ZVOL_PROP,
361 error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize, tx);
366 * Replay a TX_WRITE ZIL transaction that didn't get committed
367 * after a system failure
370 zvol_replay_write(zvol_state_t *zv, lr_write_t *lr, boolean_t byteswap)
372 objset_t *os = zv->zv_objset;
373 char *data = (char *)(lr + 1); /* data follows lr_write_t */
374 uint64_t off = lr->lr_offset;
375 uint64_t len = lr->lr_length;
380 byteswap_uint64_array(lr, sizeof (*lr));
382 tx = dmu_tx_create(os);
383 dmu_tx_hold_write(tx, ZVOL_OBJ, off, len);
384 error = dmu_tx_assign(tx, zv->zv_txg_assign);
388 dmu_write(os, ZVOL_OBJ, off, len, data, tx);
397 zvol_replay_err(zvol_state_t *zv, lr_t *lr, boolean_t byteswap)
403 * Callback vectors for replaying records.
404 * Only TX_WRITE is needed for zvol.
406 zil_replay_func_t *zvol_replay_vector[TX_MAX_TYPE] = {
407 zvol_replay_err, /* 0 no such transaction type */
408 zvol_replay_err, /* TX_CREATE */
409 zvol_replay_err, /* TX_MKDIR */
410 zvol_replay_err, /* TX_MKXATTR */
411 zvol_replay_err, /* TX_SYMLINK */
412 zvol_replay_err, /* TX_REMOVE */
413 zvol_replay_err, /* TX_RMDIR */
414 zvol_replay_err, /* TX_LINK */
415 zvol_replay_err, /* TX_RENAME */
416 zvol_replay_write, /* TX_WRITE */
417 zvol_replay_err, /* TX_TRUNCATE */
418 zvol_replay_err, /* TX_SETATTR */
419 zvol_replay_err, /* TX_ACL */
423 * Create a minor node (plus a whole lot more) for the specified volume.
426 zvol_create_minor(const char *name, major_t maj)
430 dmu_object_info_t doi;
433 struct pathname linkpath;
434 int ds_mode = DS_MODE_OWNER;
437 size_t devpathlen = strlen(ZVOL_FULL_DEV_DIR) + strlen(name) + 1;
438 char chrbuf[30], blkbuf[30];
441 mutex_enter(&zvol_state_lock);
443 if ((zv = zvol_minor_lookup(name)) != NULL) {
444 mutex_exit(&zvol_state_lock);
448 if (strchr(name, '@') != 0)
449 ds_mode |= DS_MODE_READONLY;
451 error = dmu_objset_open(name, DMU_OST_ZVOL, ds_mode, &os);
454 mutex_exit(&zvol_state_lock);
458 error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize);
461 dmu_objset_close(os);
462 mutex_exit(&zvol_state_lock);
467 * If there's an existing /dev/zvol symlink, try to use the
468 * same minor number we used last time.
470 devpath = kmem_alloc(devpathlen, KM_SLEEP);
472 (void) sprintf(devpath, "%s%s", ZVOL_FULL_DEV_DIR, name);
474 error = lookupname(devpath, UIO_SYSSPACE, NO_FOLLOW, NULL, &vp);
476 kmem_free(devpath, devpathlen);
478 if (error == 0 && vp->v_type != VLNK)
483 error = pn_getsymlink(vp, &linkpath, kcred);
485 char *ms = strstr(linkpath.pn_path, ZVOL_PSEUDO_DEV);
487 ms += strlen(ZVOL_PSEUDO_DEV);
498 * If we found a minor but it's already in use, we must pick a new one.
500 if (minor != 0 && ddi_get_soft_state(zvol_state, minor) != NULL)
504 minor = zvol_minor_alloc();
507 dmu_objset_close(os);
508 mutex_exit(&zvol_state_lock);
512 if (ddi_soft_state_zalloc(zvol_state, minor) != DDI_SUCCESS) {
513 dmu_objset_close(os);
514 mutex_exit(&zvol_state_lock);
518 (void) ddi_prop_update_string(minor, zfs_dip, ZVOL_PROP_NAME,
521 (void) sprintf(chrbuf, "%uc,raw", minor);
523 if (ddi_create_minor_node(zfs_dip, chrbuf, S_IFCHR,
524 minor, DDI_PSEUDO, 0) == DDI_FAILURE) {
525 ddi_soft_state_free(zvol_state, minor);
526 dmu_objset_close(os);
527 mutex_exit(&zvol_state_lock);
531 (void) sprintf(blkbuf, "%uc", minor);
533 if (ddi_create_minor_node(zfs_dip, blkbuf, S_IFBLK,
534 minor, DDI_PSEUDO, 0) == DDI_FAILURE) {
535 ddi_remove_minor_node(zfs_dip, chrbuf);
536 ddi_soft_state_free(zvol_state, minor);
537 dmu_objset_close(os);
538 mutex_exit(&zvol_state_lock);
542 zv = ddi_get_soft_state(zvol_state, minor);
544 (void) strcpy(zv->zv_name, name);
545 zv->zv_min_bs = DEV_BSHIFT;
546 zv->zv_minor = minor;
547 zv->zv_volsize = volsize;
549 zv->zv_mode = ds_mode;
550 zv->zv_zilog = zil_open(os, zvol_get_data);
551 mutex_init(&zv->zv_znode.z_range_lock, NULL, MUTEX_DEFAULT, NULL);
552 avl_create(&zv->zv_znode.z_range_avl, zfs_range_compare,
553 sizeof (rl_t), offsetof(rl_t, r_node));
554 list_create(&zv->zv_extents, sizeof (zvol_extent_t),
555 offsetof(zvol_extent_t, ze_node));
556 /* get and cache the blocksize */
557 error = dmu_object_info(os, ZVOL_OBJ, &doi);
559 zv->zv_volblocksize = doi.doi_data_block_size;
561 zil_replay(os, zv, &zv->zv_txg_assign, zvol_replay_vector, NULL);
562 zvol_size_changed(zv, maj);
564 /* XXX this should handle the possible i/o error */
565 VERIFY(dsl_prop_register(dmu_objset_ds(zv->zv_objset),
566 "readonly", zvol_readonly_changed_cb, zv) == 0);
570 mutex_exit(&zvol_state_lock);
576 * Remove minor node for the specified volume.
579 zvol_remove_minor(const char *name)
584 mutex_enter(&zvol_state_lock);
586 if ((zv = zvol_minor_lookup(name)) == NULL) {
587 mutex_exit(&zvol_state_lock);
591 if (zv->zv_total_opens != 0) {
592 mutex_exit(&zvol_state_lock);
596 (void) sprintf(namebuf, "%uc,raw", zv->zv_minor);
597 ddi_remove_minor_node(zfs_dip, namebuf);
599 (void) sprintf(namebuf, "%uc", zv->zv_minor);
600 ddi_remove_minor_node(zfs_dip, namebuf);
602 VERIFY(dsl_prop_unregister(dmu_objset_ds(zv->zv_objset),
603 "readonly", zvol_readonly_changed_cb, zv) == 0);
605 zil_close(zv->zv_zilog);
607 dmu_objset_close(zv->zv_objset);
608 zv->zv_objset = NULL;
609 avl_destroy(&zv->zv_znode.z_range_avl);
610 mutex_destroy(&zv->zv_znode.z_range_lock);
612 ddi_soft_state_free(zvol_state, zv->zv_minor);
616 mutex_exit(&zvol_state_lock);
622 zvol_prealloc(zvol_state_t *zv)
624 objset_t *os = zv->zv_objset;
626 uint64_t refd, avail, usedobjs, availobjs;
627 uint64_t resid = zv->zv_volsize;
630 /* Check the space usage before attempting to allocate the space */
631 dmu_objset_space(os, &refd, &avail, &usedobjs, &availobjs);
632 if (avail < zv->zv_volsize)
635 /* Free old extents if they exist */
636 zvol_free_extents(zv);
640 uint64_t bytes = MIN(resid, SPA_MAXBLOCKSIZE);
642 tx = dmu_tx_create(os);
643 dmu_tx_hold_write(tx, ZVOL_OBJ, off, bytes);
644 error = dmu_tx_assign(tx, TXG_WAIT);
647 (void) dmu_free_long_range(os, ZVOL_OBJ, 0, off);
650 dmu_prealloc(os, ZVOL_OBJ, off, bytes, tx);
655 txg_wait_synced(dmu_objset_pool(os), 0);
661 zvol_update_volsize(zvol_state_t *zv, major_t maj, uint64_t volsize)
666 ASSERT(MUTEX_HELD(&zvol_state_lock));
668 tx = dmu_tx_create(zv->zv_objset);
669 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL);
670 error = dmu_tx_assign(tx, TXG_WAIT);
676 error = zap_update(zv->zv_objset, ZVOL_ZAP_OBJ, "size", 8, 1,
681 error = dmu_free_long_range(zv->zv_objset,
682 ZVOL_OBJ, volsize, DMU_OBJECT_END);
685 * If we are using a faked-up state (zv_minor == 0) then don't
686 * try to update the in-core zvol state.
688 if (error == 0 && zv->zv_minor) {
689 zv->zv_volsize = volsize;
690 zvol_size_changed(zv, maj);
696 zvol_set_volsize(const char *name, major_t maj, uint64_t volsize)
700 dmu_object_info_t doi;
701 uint64_t old_volsize = 0ULL;
702 zvol_state_t state = { 0 };
704 mutex_enter(&zvol_state_lock);
706 if ((zv = zvol_minor_lookup(name)) == NULL) {
708 * If we are doing a "zfs clone -o volsize=", then the
709 * minor node won't exist yet.
711 error = dmu_objset_open(name, DMU_OST_ZVOL, DS_MODE_OWNER,
717 old_volsize = zv->zv_volsize;
719 if ((error = dmu_object_info(zv->zv_objset, ZVOL_OBJ, &doi)) != 0 ||
720 (error = zvol_check_volsize(volsize,
721 doi.doi_data_block_size)) != 0)
724 if (zv->zv_flags & ZVOL_RDONLY || (zv->zv_mode & DS_MODE_READONLY)) {
729 error = zvol_update_volsize(zv, maj, volsize);
732 * Reinitialize the dump area to the new size. If we
733 * failed to resize the dump area then restore the it back to
734 * it's original size.
736 if (error == 0 && zv->zv_flags & ZVOL_DUMPIFIED) {
737 if ((error = zvol_dumpify(zv)) != 0 ||
738 (error = dumpvp_resize()) != 0) {
739 (void) zvol_update_volsize(zv, maj, old_volsize);
740 error = zvol_dumpify(zv);
746 dmu_objset_close(state.zv_objset);
748 mutex_exit(&zvol_state_lock);
754 zvol_set_volblocksize(const char *name, uint64_t volblocksize)
762 * The lock may already be held if we are being called from
765 needlock = !MUTEX_HELD(&zvol_state_lock);
767 mutex_enter(&zvol_state_lock);
769 if ((zv = zvol_minor_lookup(name)) == NULL) {
771 mutex_exit(&zvol_state_lock);
774 if (zv->zv_flags & ZVOL_RDONLY || (zv->zv_mode & DS_MODE_READONLY)) {
776 mutex_exit(&zvol_state_lock);
780 tx = dmu_tx_create(zv->zv_objset);
781 dmu_tx_hold_bonus(tx, ZVOL_OBJ);
782 error = dmu_tx_assign(tx, TXG_WAIT);
786 error = dmu_object_set_blocksize(zv->zv_objset, ZVOL_OBJ,
787 volblocksize, 0, tx);
788 if (error == ENOTSUP)
792 zv->zv_volblocksize = volblocksize;
796 mutex_exit(&zvol_state_lock);
803 zvol_open(dev_t *devp, int flag, int otyp, cred_t *cr)
805 minor_t minor = getminor(*devp);
808 if (minor == 0) /* This is the control device */
811 mutex_enter(&zvol_state_lock);
813 zv = ddi_get_soft_state(zvol_state, minor);
815 mutex_exit(&zvol_state_lock);
819 ASSERT(zv->zv_objset != NULL);
821 if ((flag & FWRITE) &&
822 (zv->zv_flags & ZVOL_RDONLY || (zv->zv_mode & DS_MODE_READONLY))) {
823 mutex_exit(&zvol_state_lock);
826 if (zv->zv_flags & ZVOL_EXCL) {
827 mutex_exit(&zvol_state_lock);
831 if (zv->zv_total_opens != 0) {
832 mutex_exit(&zvol_state_lock);
835 zv->zv_flags |= ZVOL_EXCL;
838 if (zv->zv_open_count[otyp] == 0 || otyp == OTYP_LYR) {
839 zv->zv_open_count[otyp]++;
840 zv->zv_total_opens++;
843 mutex_exit(&zvol_state_lock);
850 zvol_close(dev_t dev, int flag, int otyp, cred_t *cr)
852 minor_t minor = getminor(dev);
855 if (minor == 0) /* This is the control device */
858 mutex_enter(&zvol_state_lock);
860 zv = ddi_get_soft_state(zvol_state, minor);
862 mutex_exit(&zvol_state_lock);
866 if (zv->zv_flags & ZVOL_EXCL) {
867 ASSERT(zv->zv_total_opens == 1);
868 zv->zv_flags &= ~ZVOL_EXCL;
872 * If the open count is zero, this is a spurious close.
873 * That indicates a bug in the kernel / DDI framework.
875 ASSERT(zv->zv_open_count[otyp] != 0);
876 ASSERT(zv->zv_total_opens != 0);
879 * You may get multiple opens, but only one close.
881 zv->zv_open_count[otyp]--;
882 zv->zv_total_opens--;
884 mutex_exit(&zvol_state_lock);
890 zvol_get_done(dmu_buf_t *db, void *vzgd)
892 zgd_t *zgd = (zgd_t *)vzgd;
893 rl_t *rl = zgd->zgd_rl;
895 dmu_buf_rele(db, vzgd);
896 zfs_range_unlock(rl);
897 zil_add_block(zgd->zgd_zilog, zgd->zgd_bp);
898 kmem_free(zgd, sizeof (zgd_t));
902 * Get data to generate a TX_WRITE intent log record.
905 zvol_get_data(void *arg, lr_write_t *lr, char *buf, zio_t *zio)
907 zvol_state_t *zv = arg;
908 objset_t *os = zv->zv_objset;
912 uint64_t boff; /* block starting offset */
913 int dlen = lr->lr_length; /* length of user data */
920 * Write records come in two flavors: immediate and indirect.
921 * For small writes it's cheaper to store the data with the
922 * log record (immediate); for large writes it's cheaper to
923 * sync the data and get a pointer to it (indirect) so that
924 * we don't have to write the data twice.
926 if (buf != NULL) /* immediate write */
927 return (dmu_read(os, ZVOL_OBJ, lr->lr_offset, dlen, buf));
929 zgd = (zgd_t *)kmem_alloc(sizeof (zgd_t), KM_SLEEP);
930 zgd->zgd_zilog = zv->zv_zilog;
931 zgd->zgd_bp = &lr->lr_blkptr;
934 * Lock the range of the block to ensure that when the data is
935 * written out and its checksum is being calculated that no other
936 * thread can change the block.
938 boff = P2ALIGN_TYPED(lr->lr_offset, zv->zv_volblocksize, uint64_t);
939 rl = zfs_range_lock(&zv->zv_znode, boff, zv->zv_volblocksize,
943 VERIFY(0 == dmu_buf_hold(os, ZVOL_OBJ, lr->lr_offset, zgd, &db));
944 error = dmu_sync(zio, db, &lr->lr_blkptr,
945 lr->lr_common.lrc_txg, zvol_get_done, zgd);
947 zil_add_block(zv->zv_zilog, &lr->lr_blkptr);
949 * If we get EINPROGRESS, then we need to wait for a
950 * write IO initiated by dmu_sync() to complete before
951 * we can release this dbuf. We will finish everything
952 * up in the zvol_get_done() callback.
954 if (error == EINPROGRESS)
956 dmu_buf_rele(db, zgd);
957 zfs_range_unlock(rl);
958 kmem_free(zgd, sizeof (zgd_t));
963 * zvol_log_write() handles synchronous writes using TX_WRITE ZIL transactions.
965 * We store data in the log buffers if it's small enough.
966 * Otherwise we will later flush the data out via dmu_sync().
968 ssize_t zvol_immediate_write_sz = 32768;
971 zvol_log_write(zvol_state_t *zv, dmu_tx_t *tx, offset_t off, ssize_t len)
973 uint32_t blocksize = zv->zv_volblocksize;
977 ssize_t nbytes = MIN(len, blocksize - P2PHASE(off, blocksize));
978 itx_t *itx = zil_itx_create(TX_WRITE, sizeof (*lr));
981 len > zvol_immediate_write_sz ? WR_INDIRECT : WR_NEED_COPY;
982 itx->itx_private = zv;
983 lr = (lr_write_t *)&itx->itx_lr;
984 lr->lr_foid = ZVOL_OBJ;
986 lr->lr_length = nbytes;
987 lr->lr_blkoff = off - P2ALIGN_TYPED(off, blocksize, uint64_t);
988 BP_ZERO(&lr->lr_blkptr);
990 (void) zil_itx_assign(zv->zv_zilog, itx, tx);
997 zvol_dumpio_vdev(vdev_t *vd, void *addr, uint64_t offset, uint64_t size,
998 boolean_t doread, boolean_t isdump)
1004 for (c = 0; c < vd->vdev_children; c++) {
1005 ASSERT(vd->vdev_ops == &vdev_mirror_ops);
1006 int err = zvol_dumpio_vdev(vd->vdev_child[c],
1007 addr, offset, size, doread, isdump);
1010 } else if (doread) {
1015 if (!vd->vdev_ops->vdev_op_leaf)
1016 return (numerrors < vd->vdev_children ? 0 : EIO);
1018 if (doread && !vdev_readable(vd))
1020 else if (!doread && !vdev_writeable(vd))
1024 ASSERT3P(dvd, !=, NULL);
1025 offset += VDEV_LABEL_START_SIZE;
1027 if (ddi_in_panic() || isdump) {
1031 return (ldi_dump(dvd->vd_lh, addr, lbtodb(offset),
1034 return (vdev_disk_physio(dvd->vd_lh, addr, size, offset,
1035 doread ? B_READ : B_WRITE));
1040 zvol_dumpio(zvol_state_t *zv, void *addr, uint64_t offset, uint64_t size,
1041 boolean_t doread, boolean_t isdump)
1046 spa_t *spa = dmu_objset_spa(zv->zv_objset);
1048 /* Must be sector aligned, and not stradle a block boundary. */
1049 if (P2PHASE(offset, DEV_BSIZE) || P2PHASE(size, DEV_BSIZE) ||
1050 P2BOUNDARY(offset, size, zv->zv_volblocksize)) {
1053 ASSERT(size <= zv->zv_volblocksize);
1055 /* Locate the extent this belongs to */
1056 ze = list_head(&zv->zv_extents);
1057 while (offset >= ze->ze_nblks * zv->zv_volblocksize) {
1058 offset -= ze->ze_nblks * zv->zv_volblocksize;
1059 ze = list_next(&zv->zv_extents, ze);
1061 spa_config_enter(spa, SCL_STATE, FTAG, RW_READER);
1062 vd = vdev_lookup_top(spa, DVA_GET_VDEV(&ze->ze_dva));
1063 offset += DVA_GET_OFFSET(&ze->ze_dva);
1064 error = zvol_dumpio_vdev(vd, addr, offset, size, doread, isdump);
1065 spa_config_exit(spa, SCL_STATE, FTAG);
1070 zvol_strategy(buf_t *bp)
1072 zvol_state_t *zv = ddi_get_soft_state(zvol_state, getminor(bp->b_edev));
1073 uint64_t off, volsize;
1079 boolean_t doread = bp->b_flags & B_READ;
1080 boolean_t is_dump = zv->zv_flags & ZVOL_DUMPIFIED;
1083 bioerror(bp, ENXIO);
1088 if (getminor(bp->b_edev) == 0) {
1089 bioerror(bp, EINVAL);
1094 if (!(bp->b_flags & B_READ) &&
1095 (zv->zv_flags & ZVOL_RDONLY ||
1096 zv->zv_mode & DS_MODE_READONLY)) {
1097 bioerror(bp, EROFS);
1102 off = ldbtob(bp->b_blkno);
1103 volsize = zv->zv_volsize;
1109 addr = bp->b_un.b_addr;
1110 resid = bp->b_bcount;
1112 if (resid > 0 && (off < 0 || off >= volsize)) {
1119 * There must be no buffer changes when doing a dmu_sync() because
1120 * we can't change the data whilst calculating the checksum.
1122 rl = zfs_range_lock(&zv->zv_znode, off, resid,
1123 doread ? RL_READER : RL_WRITER);
1125 while (resid != 0 && off < volsize) {
1126 size_t size = MIN(resid, zvol_maxphys);
1128 size = MIN(size, P2END(off, zv->zv_volblocksize) - off);
1129 error = zvol_dumpio(zv, addr, off, size,
1131 } else if (doread) {
1132 error = dmu_read(os, ZVOL_OBJ, off, size, addr);
1134 dmu_tx_t *tx = dmu_tx_create(os);
1135 dmu_tx_hold_write(tx, ZVOL_OBJ, off, size);
1136 error = dmu_tx_assign(tx, TXG_WAIT);
1140 dmu_write(os, ZVOL_OBJ, off, size, addr, tx);
1141 zvol_log_write(zv, tx, off, size);
1146 /* convert checksum errors into IO errors */
1147 if (error == ECKSUM)
1155 zfs_range_unlock(rl);
1157 if ((bp->b_resid = resid) == bp->b_bcount)
1158 bioerror(bp, off > volsize ? EINVAL : error);
1160 if (!(bp->b_flags & B_ASYNC) && !doread && !zil_disable && !is_dump)
1161 zil_commit(zv->zv_zilog, UINT64_MAX, ZVOL_OBJ);
1168 * Set the buffer count to the zvol maximum transfer.
1169 * Using our own routine instead of the default minphys()
1170 * means that for larger writes we write bigger buffers on X86
1171 * (128K instead of 56K) and flush the disk write cache less often
1172 * (every zvol_maxphys - currently 1MB) instead of minphys (currently
1173 * 56K on X86 and 128K on sparc).
1176 zvol_minphys(struct buf *bp)
1178 if (bp->b_bcount > zvol_maxphys)
1179 bp->b_bcount = zvol_maxphys;
1183 zvol_dump(dev_t dev, caddr_t addr, daddr_t blkno, int nblocks)
1185 minor_t minor = getminor(dev);
1192 if (minor == 0) /* This is the control device */
1195 zv = ddi_get_soft_state(zvol_state, minor);
1199 boff = ldbtob(blkno);
1200 resid = ldbtob(nblocks);
1202 VERIFY3U(boff + resid, <=, zv->zv_volsize);
1205 size = MIN(resid, P2END(boff, zv->zv_volblocksize) - boff);
1206 error = zvol_dumpio(zv, addr, boff, size, B_FALSE, B_TRUE);
1219 zvol_read(dev_t dev, uio_t *uio, cred_t *cr)
1221 minor_t minor = getminor(dev);
1227 if (minor == 0) /* This is the control device */
1230 zv = ddi_get_soft_state(zvol_state, minor);
1234 volsize = zv->zv_volsize;
1235 if (uio->uio_resid > 0 &&
1236 (uio->uio_loffset < 0 || uio->uio_loffset >= volsize))
1239 if (zv->zv_flags & ZVOL_DUMPIFIED) {
1240 error = physio(zvol_strategy, NULL, dev, B_READ,
1245 rl = zfs_range_lock(&zv->zv_znode, uio->uio_loffset, uio->uio_resid,
1247 while (uio->uio_resid > 0 && uio->uio_loffset < volsize) {
1248 uint64_t bytes = MIN(uio->uio_resid, DMU_MAX_ACCESS >> 1);
1250 /* don't read past the end */
1251 if (bytes > volsize - uio->uio_loffset)
1252 bytes = volsize - uio->uio_loffset;
1254 error = dmu_read_uio(zv->zv_objset, ZVOL_OBJ, uio, bytes);
1256 /* convert checksum errors into IO errors */
1257 if (error == ECKSUM)
1262 zfs_range_unlock(rl);
1268 zvol_write(dev_t dev, uio_t *uio, cred_t *cr)
1270 minor_t minor = getminor(dev);
1276 if (minor == 0) /* This is the control device */
1279 zv = ddi_get_soft_state(zvol_state, minor);
1283 volsize = zv->zv_volsize;
1284 if (uio->uio_resid > 0 &&
1285 (uio->uio_loffset < 0 || uio->uio_loffset >= volsize))
1288 if (zv->zv_flags & ZVOL_DUMPIFIED) {
1289 error = physio(zvol_strategy, NULL, dev, B_WRITE,
1294 rl = zfs_range_lock(&zv->zv_znode, uio->uio_loffset, uio->uio_resid,
1296 while (uio->uio_resid > 0 && uio->uio_loffset < volsize) {
1297 uint64_t bytes = MIN(uio->uio_resid, DMU_MAX_ACCESS >> 1);
1298 uint64_t off = uio->uio_loffset;
1299 dmu_tx_t *tx = dmu_tx_create(zv->zv_objset);
1301 if (bytes > volsize - off) /* don't write past the end */
1302 bytes = volsize - off;
1304 dmu_tx_hold_write(tx, ZVOL_OBJ, off, bytes);
1305 error = dmu_tx_assign(tx, TXG_WAIT);
1310 error = dmu_write_uio(zv->zv_objset, ZVOL_OBJ, uio, bytes, tx);
1312 zvol_log_write(zv, tx, off, bytes);
1318 zfs_range_unlock(rl);
1323 zvol_getefi(void *arg, int flag, uint64_t vs, uint8_t bs)
1325 struct uuid uuid = EFI_RESERVED;
1326 efi_gpe_t gpe = { 0 };
1332 if (ddi_copyin(arg, &efi, sizeof (dk_efi_t), flag))
1334 ptr = (char *)(uintptr_t)efi.dki_data_64;
1335 length = efi.dki_length;
1337 * Some clients may attempt to request a PMBR for the
1338 * zvol. Currently this interface will return EINVAL to
1339 * such requests. These requests could be supported by
1340 * adding a check for lba == 0 and consing up an appropriate
1343 if (efi.dki_lba < 1 || efi.dki_lba > 2 || length <= 0)
1346 gpe.efi_gpe_StartingLBA = LE_64(34ULL);
1347 gpe.efi_gpe_EndingLBA = LE_64((vs >> bs) - 1);
1348 UUID_LE_CONVERT(gpe.efi_gpe_PartitionTypeGUID, uuid);
1350 if (efi.dki_lba == 1) {
1351 efi_gpt_t gpt = { 0 };
1353 gpt.efi_gpt_Signature = LE_64(EFI_SIGNATURE);
1354 gpt.efi_gpt_Revision = LE_32(EFI_VERSION_CURRENT);
1355 gpt.efi_gpt_HeaderSize = LE_32(sizeof (gpt));
1356 gpt.efi_gpt_MyLBA = LE_64(1ULL);
1357 gpt.efi_gpt_FirstUsableLBA = LE_64(34ULL);
1358 gpt.efi_gpt_LastUsableLBA = LE_64((vs >> bs) - 1);
1359 gpt.efi_gpt_PartitionEntryLBA = LE_64(2ULL);
1360 gpt.efi_gpt_NumberOfPartitionEntries = LE_32(1);
1361 gpt.efi_gpt_SizeOfPartitionEntry =
1362 LE_32(sizeof (efi_gpe_t));
1363 CRC32(crc, &gpe, sizeof (gpe), -1U, crc32_table);
1364 gpt.efi_gpt_PartitionEntryArrayCRC32 = LE_32(~crc);
1365 CRC32(crc, &gpt, sizeof (gpt), -1U, crc32_table);
1366 gpt.efi_gpt_HeaderCRC32 = LE_32(~crc);
1367 if (ddi_copyout(&gpt, ptr, MIN(sizeof (gpt), length),
1370 ptr += sizeof (gpt);
1371 length -= sizeof (gpt);
1373 if (length > 0 && ddi_copyout(&gpe, ptr, MIN(sizeof (gpe),
1380 * Dirtbag ioctls to support mkfs(1M) for UFS filesystems. See dkio(7I).
1384 zvol_ioctl(dev_t dev, int cmd, intptr_t arg, int flag, cred_t *cr, int *rvalp)
1387 struct dk_cinfo dki;
1388 struct dk_minfo dkm;
1389 struct dk_callback *dkc;
1393 mutex_enter(&zvol_state_lock);
1395 zv = ddi_get_soft_state(zvol_state, getminor(dev));
1398 mutex_exit(&zvol_state_lock);
1405 bzero(&dki, sizeof (dki));
1406 (void) strcpy(dki.dki_cname, "zvol");
1407 (void) strcpy(dki.dki_dname, "zvol");
1408 dki.dki_ctype = DKC_UNKNOWN;
1409 dki.dki_maxtransfer = 1 << (SPA_MAXBLOCKSHIFT - zv->zv_min_bs);
1410 mutex_exit(&zvol_state_lock);
1411 if (ddi_copyout(&dki, (void *)arg, sizeof (dki), flag))
1415 case DKIOCGMEDIAINFO:
1416 bzero(&dkm, sizeof (dkm));
1417 dkm.dki_lbsize = 1U << zv->zv_min_bs;
1418 dkm.dki_capacity = zv->zv_volsize >> zv->zv_min_bs;
1419 dkm.dki_media_type = DK_UNKNOWN;
1420 mutex_exit(&zvol_state_lock);
1421 if (ddi_copyout(&dkm, (void *)arg, sizeof (dkm), flag))
1427 uint64_t vs = zv->zv_volsize;
1428 uint8_t bs = zv->zv_min_bs;
1430 mutex_exit(&zvol_state_lock);
1431 error = zvol_getefi((void *)arg, flag, vs, bs);
1435 case DKIOCFLUSHWRITECACHE:
1436 dkc = (struct dk_callback *)arg;
1437 zil_commit(zv->zv_zilog, UINT64_MAX, ZVOL_OBJ);
1438 if ((flag & FKIOCTL) && dkc != NULL && dkc->dkc_callback) {
1439 (*dkc->dkc_callback)(dkc->dkc_cookie, error);
1447 * commands using these (like prtvtoc) expect ENOTSUP
1448 * since we're emulating an EFI label
1454 rl = zfs_range_lock(&zv->zv_znode, 0, zv->zv_volsize,
1456 error = zvol_dumpify(zv);
1457 zfs_range_unlock(rl);
1461 rl = zfs_range_lock(&zv->zv_znode, 0, zv->zv_volsize,
1463 error = zvol_dump_fini(zv);
1464 zfs_range_unlock(rl);
1472 mutex_exit(&zvol_state_lock);
1479 return (zvol_minors != 0);
1485 VERIFY(ddi_soft_state_init(&zvol_state, sizeof (zvol_state_t), 1) == 0);
1486 mutex_init(&zvol_state_lock, NULL, MUTEX_DEFAULT, NULL);
1492 mutex_destroy(&zvol_state_lock);
1493 ddi_soft_state_fini(&zvol_state);
1497 zvol_is_swap(zvol_state_t *zv)
1500 boolean_t ret = B_FALSE;
1505 devpathlen = strlen(ZVOL_FULL_DEV_DIR) + strlen(zv->zv_name) + 1;
1506 devpath = kmem_alloc(devpathlen, KM_SLEEP);
1507 (void) sprintf(devpath, "%s%s", ZVOL_FULL_DEV_DIR, zv->zv_name);
1508 error = lookupname(devpath, UIO_SYSSPACE, FOLLOW, NULLVPP, &vp);
1509 kmem_free(devpath, devpathlen);
1511 ret = !error && IS_SWAPVP(common_specvp(vp));
1520 zvol_dump_init(zvol_state_t *zv, boolean_t resize)
1524 objset_t *os = zv->zv_objset;
1525 nvlist_t *nv = NULL;
1527 ASSERT(MUTEX_HELD(&zvol_state_lock));
1529 tx = dmu_tx_create(os);
1530 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL);
1531 error = dmu_tx_assign(tx, TXG_WAIT);
1538 * If we are resizing the dump device then we only need to
1539 * update the refreservation to match the newly updated
1540 * zvolsize. Otherwise, we save off the original state of the
1541 * zvol so that we can restore them if the zvol is ever undumpified.
1544 error = zap_update(os, ZVOL_ZAP_OBJ,
1545 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1,
1546 &zv->zv_volsize, tx);
1548 uint64_t checksum, compress, refresrv, vbs;
1550 error = dsl_prop_get_integer(zv->zv_name,
1551 zfs_prop_to_name(ZFS_PROP_COMPRESSION), &compress, NULL);
1552 error = error ? error : dsl_prop_get_integer(zv->zv_name,
1553 zfs_prop_to_name(ZFS_PROP_CHECKSUM), &checksum, NULL);
1554 error = error ? error : dsl_prop_get_integer(zv->zv_name,
1555 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &refresrv, NULL);
1556 error = error ? error : dsl_prop_get_integer(zv->zv_name,
1557 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &vbs, NULL);
1559 error = error ? error : zap_update(os, ZVOL_ZAP_OBJ,
1560 zfs_prop_to_name(ZFS_PROP_COMPRESSION), 8, 1,
1562 error = error ? error : zap_update(os, ZVOL_ZAP_OBJ,
1563 zfs_prop_to_name(ZFS_PROP_CHECKSUM), 8, 1, &checksum, tx);
1564 error = error ? error : zap_update(os, ZVOL_ZAP_OBJ,
1565 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1,
1567 error = error ? error : zap_update(os, ZVOL_ZAP_OBJ,
1568 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), 8, 1,
1573 /* Truncate the file */
1575 error = dmu_free_long_range(zv->zv_objset,
1576 ZVOL_OBJ, 0, DMU_OBJECT_END);
1582 * We only need update the zvol's property if we are initializing
1583 * the dump area for the first time.
1586 VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0);
1587 VERIFY(nvlist_add_uint64(nv,
1588 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 0) == 0);
1589 VERIFY(nvlist_add_uint64(nv,
1590 zfs_prop_to_name(ZFS_PROP_COMPRESSION),
1591 ZIO_COMPRESS_OFF) == 0);
1592 VERIFY(nvlist_add_uint64(nv,
1593 zfs_prop_to_name(ZFS_PROP_CHECKSUM),
1594 ZIO_CHECKSUM_OFF) == 0);
1595 VERIFY(nvlist_add_uint64(nv,
1596 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE),
1597 SPA_MAXBLOCKSIZE) == 0);
1599 error = zfs_set_prop_nvlist(zv->zv_name, nv);
1606 /* Allocate the space for the dump */
1607 error = zvol_prealloc(zv);
1612 zvol_dumpify(zvol_state_t *zv)
1615 uint64_t dumpsize = 0;
1617 objset_t *os = zv->zv_objset;
1619 if (zv->zv_flags & ZVOL_RDONLY || (zv->zv_mode & DS_MODE_READONLY))
1623 * We do not support swap devices acting as dump devices.
1625 if (zvol_is_swap(zv))
1628 if (zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE,
1629 8, 1, &dumpsize) != 0 || dumpsize != zv->zv_volsize) {
1630 boolean_t resize = (dumpsize > 0) ? B_TRUE : B_FALSE;
1632 if ((error = zvol_dump_init(zv, resize)) != 0) {
1633 (void) zvol_dump_fini(zv);
1639 * Build up our lba mapping.
1641 error = zvol_get_lbas(zv);
1643 (void) zvol_dump_fini(zv);
1647 tx = dmu_tx_create(os);
1648 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL);
1649 error = dmu_tx_assign(tx, TXG_WAIT);
1652 (void) zvol_dump_fini(zv);
1656 zv->zv_flags |= ZVOL_DUMPIFIED;
1657 error = zap_update(os, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, 8, 1,
1658 &zv->zv_volsize, tx);
1662 (void) zvol_dump_fini(zv);
1666 txg_wait_synced(dmu_objset_pool(os), 0);
1671 zvol_dump_fini(zvol_state_t *zv)
1674 objset_t *os = zv->zv_objset;
1677 uint64_t checksum, compress, refresrv, vbs;
1680 * Attempt to restore the zvol back to its pre-dumpified state.
1681 * This is a best-effort attempt as it's possible that not all
1682 * of these properties were initialized during the dumpify process
1683 * (i.e. error during zvol_dump_init).
1686 tx = dmu_tx_create(os);
1687 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL);
1688 error = dmu_tx_assign(tx, TXG_WAIT);
1693 (void) zap_remove(os, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, tx);
1696 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ,
1697 zfs_prop_to_name(ZFS_PROP_CHECKSUM), 8, 1, &checksum);
1698 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ,
1699 zfs_prop_to_name(ZFS_PROP_COMPRESSION), 8, 1, &compress);
1700 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ,
1701 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1, &refresrv);
1702 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ,
1703 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), 8, 1, &vbs);
1705 VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0);
1706 (void) nvlist_add_uint64(nv,
1707 zfs_prop_to_name(ZFS_PROP_CHECKSUM), checksum);
1708 (void) nvlist_add_uint64(nv,
1709 zfs_prop_to_name(ZFS_PROP_COMPRESSION), compress);
1710 (void) nvlist_add_uint64(nv,
1711 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), refresrv);
1712 (void) nvlist_add_uint64(nv,
1713 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), vbs);
1714 (void) zfs_set_prop_nvlist(zv->zv_name, nv);
1717 zvol_free_extents(zv);
1718 zv->zv_flags &= ~ZVOL_DUMPIFIED;
1719 (void) dmu_free_long_range(os, ZVOL_OBJ, 0, DMU_OBJECT_END);