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 2009 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>
78 #include <sys/zil_impl.h>
80 #include "zfs_namecheck.h"
82 static void *zvol_state;
84 #define ZVOL_DUMPSIZE "dumpsize"
87 * This lock protects the zvol_state structure from being modified
88 * while it's being used, e.g. an open that comes in before a create
89 * finishes. It also protects temporary opens of the dataset so that,
90 * e.g., an open doesn't get a spurious EBUSY.
92 static kmutex_t zvol_state_lock;
93 static uint32_t zvol_minors;
95 typedef struct zvol_extent {
97 dva_t ze_dva; /* dva associated with this extent */
98 uint64_t ze_nblks; /* number of blocks in extent */
102 * The in-core state of each volume.
104 typedef struct zvol_state {
105 char zv_name[MAXPATHLEN]; /* pool/dd name */
106 uint64_t zv_volsize; /* amount of space we advertise */
107 uint64_t zv_volblocksize; /* volume block size */
108 minor_t zv_minor; /* minor number */
109 uint8_t zv_min_bs; /* minimum addressable block shift */
110 uint8_t zv_flags; /* readonly, dumpified, etc. */
111 objset_t *zv_objset; /* objset handle */
112 uint32_t zv_mode; /* DS_MODE_* flags at open time */
113 uint32_t zv_open_count[OTYPCNT]; /* open counts */
114 uint32_t zv_total_opens; /* total open count */
115 zilog_t *zv_zilog; /* ZIL handle */
116 list_t zv_extents; /* List of extents for dump */
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
129 * zvol maximum transfer in one DMU tx.
131 int zvol_maxphys = DMU_MAX_ACCESS/2;
133 extern int zfs_set_prop_nvlist(const char *, nvlist_t *);
134 static int zvol_get_data(void *arg, lr_write_t *lr, char *buf, zio_t *zio);
135 static int zvol_dumpify(zvol_state_t *zv);
136 static int zvol_dump_fini(zvol_state_t *zv);
137 static int zvol_dump_init(zvol_state_t *zv, boolean_t resize);
140 zvol_size_changed(zvol_state_t *zv, major_t maj)
142 dev_t dev = makedevice(maj, zv->zv_minor);
144 VERIFY(ddi_prop_update_int64(dev, zfs_dip,
145 "Size", zv->zv_volsize) == DDI_SUCCESS);
146 VERIFY(ddi_prop_update_int64(dev, zfs_dip,
147 "Nblocks", lbtodb(zv->zv_volsize)) == DDI_SUCCESS);
149 /* Notify specfs to invalidate the cached size */
150 spec_size_invalidate(dev, VBLK);
151 spec_size_invalidate(dev, VCHR);
155 zvol_check_volsize(uint64_t volsize, uint64_t blocksize)
160 if (volsize % blocksize != 0)
164 if (volsize - 1 > SPEC_MAXOFFSET_T)
171 zvol_check_volblocksize(uint64_t volblocksize)
173 if (volblocksize < SPA_MINBLOCKSIZE ||
174 volblocksize > SPA_MAXBLOCKSIZE ||
182 zvol_readonly_changed_cb(void *arg, uint64_t newval)
184 zvol_state_t *zv = arg;
187 zv->zv_flags |= ZVOL_RDONLY;
189 zv->zv_flags &= ~ZVOL_RDONLY;
193 zvol_get_stats(objset_t *os, nvlist_t *nv)
196 dmu_object_info_t doi;
200 error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &val);
204 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLSIZE, val);
206 error = dmu_object_info(os, ZVOL_OBJ, &doi);
209 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLBLOCKSIZE,
210 doi.doi_data_block_size);
217 * Find a free minor number.
220 zvol_minor_alloc(void)
224 ASSERT(MUTEX_HELD(&zvol_state_lock));
226 for (minor = 1; minor <= ZVOL_MAX_MINOR; minor++)
227 if (ddi_get_soft_state(zvol_state, minor) == NULL)
233 static zvol_state_t *
234 zvol_minor_lookup(const char *name)
239 ASSERT(MUTEX_HELD(&zvol_state_lock));
241 for (minor = 1; minor <= ZVOL_MAX_MINOR; minor++) {
242 zv = ddi_get_soft_state(zvol_state, minor);
245 if (strcmp(zv->zv_name, name) == 0)
252 /* extent mapping arg */
260 zvol_map_block(spa_t *spa, blkptr_t *bp, const zbookmark_t *zb,
261 const dnode_phys_t *dnp, void *arg)
263 struct maparg *ma = arg;
265 int bs = ma->ma_zv->zv_volblocksize;
267 if (bp == NULL || zb->zb_object != ZVOL_OBJ || zb->zb_level != 0)
270 VERIFY3U(ma->ma_blks, ==, zb->zb_blkid);
273 /* Abort immediately if we have encountered gang blocks */
278 * See if the block is at the end of the previous extent.
280 ze = list_tail(&ma->ma_zv->zv_extents);
282 DVA_GET_VDEV(BP_IDENTITY(bp)) == DVA_GET_VDEV(&ze->ze_dva) &&
283 DVA_GET_OFFSET(BP_IDENTITY(bp)) ==
284 DVA_GET_OFFSET(&ze->ze_dva) + ze->ze_nblks * bs) {
289 dprintf_bp(bp, "%s", "next blkptr:");
291 /* start a new extent */
292 ze = kmem_zalloc(sizeof (zvol_extent_t), KM_SLEEP);
293 ze->ze_dva = bp->blk_dva[0]; /* structure assignment */
295 list_insert_tail(&ma->ma_zv->zv_extents, ze);
300 zvol_free_extents(zvol_state_t *zv)
304 while (ze = list_head(&zv->zv_extents)) {
305 list_remove(&zv->zv_extents, ze);
306 kmem_free(ze, sizeof (zvol_extent_t));
311 zvol_get_lbas(zvol_state_t *zv)
318 zvol_free_extents(zv);
320 err = traverse_dataset(dmu_objset_ds(zv->zv_objset), 0,
321 TRAVERSE_PRE | TRAVERSE_PREFETCH_METADATA, zvol_map_block, &ma);
322 if (err || ma.ma_blks != (zv->zv_volsize / zv->zv_volblocksize)) {
323 zvol_free_extents(zv);
324 return (err ? err : EIO);
332 zvol_create_cb(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx)
334 zfs_creat_t *zct = arg;
335 nvlist_t *nvprops = zct->zct_props;
337 uint64_t volblocksize, volsize;
339 VERIFY(nvlist_lookup_uint64(nvprops,
340 zfs_prop_to_name(ZFS_PROP_VOLSIZE), &volsize) == 0);
341 if (nvlist_lookup_uint64(nvprops,
342 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &volblocksize) != 0)
343 volblocksize = zfs_prop_default_numeric(ZFS_PROP_VOLBLOCKSIZE);
346 * These properties must be removed from the list so the generic
347 * property setting step won't apply to them.
349 VERIFY(nvlist_remove_all(nvprops,
350 zfs_prop_to_name(ZFS_PROP_VOLSIZE)) == 0);
351 (void) nvlist_remove_all(nvprops,
352 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE));
354 error = dmu_object_claim(os, ZVOL_OBJ, DMU_OT_ZVOL, volblocksize,
358 error = zap_create_claim(os, ZVOL_ZAP_OBJ, DMU_OT_ZVOL_PROP,
362 error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize, tx);
367 * Replay a TX_WRITE ZIL transaction that didn't get committed
368 * after a system failure
371 zvol_replay_write(zvol_state_t *zv, lr_write_t *lr, boolean_t byteswap)
373 objset_t *os = zv->zv_objset;
374 char *data = (char *)(lr + 1); /* data follows lr_write_t */
375 uint64_t off = lr->lr_offset;
376 uint64_t len = lr->lr_length;
381 byteswap_uint64_array(lr, sizeof (*lr));
383 tx = dmu_tx_create(os);
384 dmu_tx_hold_write(tx, ZVOL_OBJ, off, len);
385 error = dmu_tx_assign(tx, TXG_WAIT);
389 dmu_write(os, ZVOL_OBJ, off, len, data, tx);
398 zvol_replay_err(zvol_state_t *zv, lr_t *lr, boolean_t byteswap)
404 * Callback vectors for replaying records.
405 * Only TX_WRITE is needed for zvol.
407 zil_replay_func_t *zvol_replay_vector[TX_MAX_TYPE] = {
408 zvol_replay_err, /* 0 no such transaction type */
409 zvol_replay_err, /* TX_CREATE */
410 zvol_replay_err, /* TX_MKDIR */
411 zvol_replay_err, /* TX_MKXATTR */
412 zvol_replay_err, /* TX_SYMLINK */
413 zvol_replay_err, /* TX_REMOVE */
414 zvol_replay_err, /* TX_RMDIR */
415 zvol_replay_err, /* TX_LINK */
416 zvol_replay_err, /* TX_RENAME */
417 zvol_replay_write, /* TX_WRITE */
418 zvol_replay_err, /* TX_TRUNCATE */
419 zvol_replay_err, /* TX_SETATTR */
420 zvol_replay_err, /* TX_ACL */
424 * Create a minor node (plus a whole lot more) for the specified volume.
427 zvol_create_minor(const char *name, major_t maj)
431 dmu_object_info_t doi;
434 struct pathname linkpath;
435 int ds_mode = DS_MODE_OWNER;
438 size_t devpathlen = strlen(ZVOL_FULL_DEV_DIR) + strlen(name) + 1;
439 char chrbuf[30], blkbuf[30];
442 mutex_enter(&zvol_state_lock);
444 if ((zv = zvol_minor_lookup(name)) != NULL) {
445 mutex_exit(&zvol_state_lock);
449 if (strchr(name, '@') != 0)
450 ds_mode |= DS_MODE_READONLY;
452 error = dmu_objset_open(name, DMU_OST_ZVOL, ds_mode, &os);
455 mutex_exit(&zvol_state_lock);
459 error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize);
462 dmu_objset_close(os);
463 mutex_exit(&zvol_state_lock);
468 * If there's an existing /dev/zvol symlink, try to use the
469 * same minor number we used last time.
471 devpath = kmem_alloc(devpathlen, KM_SLEEP);
473 (void) sprintf(devpath, "%s%s", ZVOL_FULL_DEV_DIR, name);
475 error = lookupname(devpath, UIO_SYSSPACE, NO_FOLLOW, NULL, &vp);
477 kmem_free(devpath, devpathlen);
479 if (error == 0 && vp->v_type != VLNK)
484 error = pn_getsymlink(vp, &linkpath, kcred);
486 char *ms = strstr(linkpath.pn_path, ZVOL_PSEUDO_DEV);
488 ms += strlen(ZVOL_PSEUDO_DEV);
499 * If we found a minor but it's already in use, we must pick a new one.
501 if (minor != 0 && ddi_get_soft_state(zvol_state, minor) != NULL)
505 minor = zvol_minor_alloc();
508 dmu_objset_close(os);
509 mutex_exit(&zvol_state_lock);
513 if (ddi_soft_state_zalloc(zvol_state, minor) != DDI_SUCCESS) {
514 dmu_objset_close(os);
515 mutex_exit(&zvol_state_lock);
519 (void) ddi_prop_update_string(minor, zfs_dip, ZVOL_PROP_NAME,
522 (void) sprintf(chrbuf, "%uc,raw", minor);
524 if (ddi_create_minor_node(zfs_dip, chrbuf, S_IFCHR,
525 minor, DDI_PSEUDO, 0) == DDI_FAILURE) {
526 ddi_soft_state_free(zvol_state, minor);
527 dmu_objset_close(os);
528 mutex_exit(&zvol_state_lock);
532 (void) sprintf(blkbuf, "%uc", minor);
534 if (ddi_create_minor_node(zfs_dip, blkbuf, S_IFBLK,
535 minor, DDI_PSEUDO, 0) == DDI_FAILURE) {
536 ddi_remove_minor_node(zfs_dip, chrbuf);
537 ddi_soft_state_free(zvol_state, minor);
538 dmu_objset_close(os);
539 mutex_exit(&zvol_state_lock);
543 zv = ddi_get_soft_state(zvol_state, minor);
545 (void) strcpy(zv->zv_name, name);
546 zv->zv_min_bs = DEV_BSHIFT;
547 zv->zv_minor = minor;
548 zv->zv_volsize = volsize;
550 zv->zv_mode = ds_mode;
551 zv->zv_zilog = zil_open(os, zvol_get_data);
552 mutex_init(&zv->zv_znode.z_range_lock, NULL, MUTEX_DEFAULT, NULL);
553 avl_create(&zv->zv_znode.z_range_avl, zfs_range_compare,
554 sizeof (rl_t), offsetof(rl_t, r_node));
555 list_create(&zv->zv_extents, sizeof (zvol_extent_t),
556 offsetof(zvol_extent_t, ze_node));
557 /* get and cache the blocksize */
558 error = dmu_object_info(os, ZVOL_OBJ, &doi);
560 zv->zv_volblocksize = doi.doi_data_block_size;
562 zil_replay(os, zv, zvol_replay_vector);
563 zvol_size_changed(zv, maj);
565 /* XXX this should handle the possible i/o error */
566 VERIFY(dsl_prop_register(dmu_objset_ds(zv->zv_objset),
567 "readonly", zvol_readonly_changed_cb, zv) == 0);
571 mutex_exit(&zvol_state_lock);
577 * Remove minor node for the specified volume.
580 zvol_remove_minor(const char *name)
585 mutex_enter(&zvol_state_lock);
587 if ((zv = zvol_minor_lookup(name)) == NULL) {
588 mutex_exit(&zvol_state_lock);
592 if (zv->zv_total_opens != 0) {
593 mutex_exit(&zvol_state_lock);
597 (void) sprintf(namebuf, "%uc,raw", zv->zv_minor);
598 ddi_remove_minor_node(zfs_dip, namebuf);
600 (void) sprintf(namebuf, "%uc", zv->zv_minor);
601 ddi_remove_minor_node(zfs_dip, namebuf);
603 VERIFY(dsl_prop_unregister(dmu_objset_ds(zv->zv_objset),
604 "readonly", zvol_readonly_changed_cb, zv) == 0);
606 zil_close(zv->zv_zilog);
608 dmu_objset_close(zv->zv_objset);
609 zv->zv_objset = NULL;
610 avl_destroy(&zv->zv_znode.z_range_avl);
611 mutex_destroy(&zv->zv_znode.z_range_lock);
613 ddi_soft_state_free(zvol_state, zv->zv_minor);
617 mutex_exit(&zvol_state_lock);
623 zvol_prealloc(zvol_state_t *zv)
625 objset_t *os = zv->zv_objset;
627 uint64_t refd, avail, usedobjs, availobjs;
628 uint64_t resid = zv->zv_volsize;
631 /* Check the space usage before attempting to allocate the space */
632 dmu_objset_space(os, &refd, &avail, &usedobjs, &availobjs);
633 if (avail < zv->zv_volsize)
636 /* Free old extents if they exist */
637 zvol_free_extents(zv);
641 uint64_t bytes = MIN(resid, SPA_MAXBLOCKSIZE);
643 tx = dmu_tx_create(os);
644 dmu_tx_hold_write(tx, ZVOL_OBJ, off, bytes);
645 error = dmu_tx_assign(tx, TXG_WAIT);
648 (void) dmu_free_long_range(os, ZVOL_OBJ, 0, off);
651 dmu_prealloc(os, ZVOL_OBJ, off, bytes, tx);
656 txg_wait_synced(dmu_objset_pool(os), 0);
662 zvol_update_volsize(zvol_state_t *zv, major_t maj, uint64_t volsize)
667 ASSERT(MUTEX_HELD(&zvol_state_lock));
669 tx = dmu_tx_create(zv->zv_objset);
670 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL);
671 error = dmu_tx_assign(tx, TXG_WAIT);
677 error = zap_update(zv->zv_objset, ZVOL_ZAP_OBJ, "size", 8, 1,
682 error = dmu_free_long_range(zv->zv_objset,
683 ZVOL_OBJ, volsize, DMU_OBJECT_END);
686 * If we are using a faked-up state (zv_minor == 0) then don't
687 * try to update the in-core zvol state.
689 if (error == 0 && zv->zv_minor) {
690 zv->zv_volsize = volsize;
691 zvol_size_changed(zv, maj);
697 zvol_set_volsize(const char *name, major_t maj, uint64_t volsize)
701 dmu_object_info_t doi;
702 uint64_t old_volsize = 0ULL;
703 zvol_state_t state = { 0 };
705 mutex_enter(&zvol_state_lock);
707 if ((zv = zvol_minor_lookup(name)) == NULL) {
709 * If we are doing a "zfs clone -o volsize=", then the
710 * minor node won't exist yet.
712 error = dmu_objset_open(name, DMU_OST_ZVOL, DS_MODE_OWNER,
718 old_volsize = zv->zv_volsize;
720 if ((error = dmu_object_info(zv->zv_objset, ZVOL_OBJ, &doi)) != 0 ||
721 (error = zvol_check_volsize(volsize,
722 doi.doi_data_block_size)) != 0)
725 if (zv->zv_flags & ZVOL_RDONLY || (zv->zv_mode & DS_MODE_READONLY)) {
730 error = zvol_update_volsize(zv, maj, volsize);
733 * Reinitialize the dump area to the new size. If we
734 * failed to resize the dump area then restore the it back to
735 * it's original size.
737 if (error == 0 && zv->zv_flags & ZVOL_DUMPIFIED) {
738 if ((error = zvol_dumpify(zv)) != 0 ||
739 (error = dumpvp_resize()) != 0) {
740 (void) zvol_update_volsize(zv, maj, old_volsize);
741 error = zvol_dumpify(zv);
746 * Generate a LUN expansion event.
751 char *physpath = kmem_zalloc(MAXPATHLEN, KM_SLEEP);
753 (void) snprintf(physpath, MAXPATHLEN, "%s%uc", ZVOL_PSEUDO_DEV,
756 VERIFY(nvlist_alloc(&attr, NV_UNIQUE_NAME, KM_SLEEP) == 0);
757 VERIFY(nvlist_add_string(attr, DEV_PHYS_PATH, physpath) == 0);
759 (void) ddi_log_sysevent(zfs_dip, SUNW_VENDOR, EC_DEV_STATUS,
760 ESC_DEV_DLE, attr, &eid, DDI_SLEEP);
763 kmem_free(physpath, MAXPATHLEN);
768 dmu_objset_close(state.zv_objset);
770 mutex_exit(&zvol_state_lock);
776 zvol_set_volblocksize(const char *name, uint64_t volblocksize)
784 * The lock may already be held if we are being called from
787 needlock = !MUTEX_HELD(&zvol_state_lock);
789 mutex_enter(&zvol_state_lock);
791 if ((zv = zvol_minor_lookup(name)) == NULL) {
793 mutex_exit(&zvol_state_lock);
796 if (zv->zv_flags & ZVOL_RDONLY || (zv->zv_mode & DS_MODE_READONLY)) {
798 mutex_exit(&zvol_state_lock);
802 tx = dmu_tx_create(zv->zv_objset);
803 dmu_tx_hold_bonus(tx, ZVOL_OBJ);
804 error = dmu_tx_assign(tx, TXG_WAIT);
808 error = dmu_object_set_blocksize(zv->zv_objset, ZVOL_OBJ,
809 volblocksize, 0, tx);
810 if (error == ENOTSUP)
814 zv->zv_volblocksize = volblocksize;
818 mutex_exit(&zvol_state_lock);
825 zvol_open(dev_t *devp, int flag, int otyp, cred_t *cr)
827 minor_t minor = getminor(*devp);
830 if (minor == 0) /* This is the control device */
833 mutex_enter(&zvol_state_lock);
835 zv = ddi_get_soft_state(zvol_state, minor);
837 mutex_exit(&zvol_state_lock);
841 ASSERT(zv->zv_objset != NULL);
843 if ((flag & FWRITE) &&
844 (zv->zv_flags & ZVOL_RDONLY || (zv->zv_mode & DS_MODE_READONLY))) {
845 mutex_exit(&zvol_state_lock);
848 if (zv->zv_flags & ZVOL_EXCL) {
849 mutex_exit(&zvol_state_lock);
853 if (zv->zv_total_opens != 0) {
854 mutex_exit(&zvol_state_lock);
857 zv->zv_flags |= ZVOL_EXCL;
860 if (zv->zv_open_count[otyp] == 0 || otyp == OTYP_LYR) {
861 zv->zv_open_count[otyp]++;
862 zv->zv_total_opens++;
865 mutex_exit(&zvol_state_lock);
872 zvol_close(dev_t dev, int flag, int otyp, cred_t *cr)
874 minor_t minor = getminor(dev);
877 if (minor == 0) /* This is the control device */
880 mutex_enter(&zvol_state_lock);
882 zv = ddi_get_soft_state(zvol_state, minor);
884 mutex_exit(&zvol_state_lock);
888 if (zv->zv_flags & ZVOL_EXCL) {
889 ASSERT(zv->zv_total_opens == 1);
890 zv->zv_flags &= ~ZVOL_EXCL;
894 * If the open count is zero, this is a spurious close.
895 * That indicates a bug in the kernel / DDI framework.
897 ASSERT(zv->zv_open_count[otyp] != 0);
898 ASSERT(zv->zv_total_opens != 0);
901 * You may get multiple opens, but only one close.
903 zv->zv_open_count[otyp]--;
904 zv->zv_total_opens--;
906 mutex_exit(&zvol_state_lock);
912 zvol_get_done(dmu_buf_t *db, void *vzgd)
914 zgd_t *zgd = (zgd_t *)vzgd;
915 rl_t *rl = zgd->zgd_rl;
917 dmu_buf_rele(db, vzgd);
918 zfs_range_unlock(rl);
919 zil_add_block(zgd->zgd_zilog, zgd->zgd_bp);
920 kmem_free(zgd, sizeof (zgd_t));
924 * Get data to generate a TX_WRITE intent log record.
927 zvol_get_data(void *arg, lr_write_t *lr, char *buf, zio_t *zio)
929 zvol_state_t *zv = arg;
930 objset_t *os = zv->zv_objset;
934 uint64_t boff; /* block starting offset */
935 int dlen = lr->lr_length; /* length of user data */
942 * Write records come in two flavors: immediate and indirect.
943 * For small writes it's cheaper to store the data with the
944 * log record (immediate); for large writes it's cheaper to
945 * sync the data and get a pointer to it (indirect) so that
946 * we don't have to write the data twice.
948 if (buf != NULL) /* immediate write */
949 return (dmu_read(os, ZVOL_OBJ, lr->lr_offset, dlen, buf,
950 DMU_READ_NO_PREFETCH));
952 zgd = (zgd_t *)kmem_alloc(sizeof (zgd_t), KM_SLEEP);
953 zgd->zgd_zilog = zv->zv_zilog;
954 zgd->zgd_bp = &lr->lr_blkptr;
957 * Lock the range of the block to ensure that when the data is
958 * written out and its checksum is being calculated that no other
959 * thread can change the block.
961 boff = P2ALIGN_TYPED(lr->lr_offset, zv->zv_volblocksize, uint64_t);
962 rl = zfs_range_lock(&zv->zv_znode, boff, zv->zv_volblocksize,
966 VERIFY(0 == dmu_buf_hold(os, ZVOL_OBJ, lr->lr_offset, zgd, &db));
967 error = dmu_sync(zio, db, &lr->lr_blkptr,
968 lr->lr_common.lrc_txg, zvol_get_done, zgd);
970 zil_add_block(zv->zv_zilog, &lr->lr_blkptr);
972 * If we get EINPROGRESS, then we need to wait for a
973 * write IO initiated by dmu_sync() to complete before
974 * we can release this dbuf. We will finish everything
975 * up in the zvol_get_done() callback.
977 if (error == EINPROGRESS)
979 dmu_buf_rele(db, zgd);
980 zfs_range_unlock(rl);
981 kmem_free(zgd, sizeof (zgd_t));
986 * zvol_log_write() handles synchronous writes using TX_WRITE ZIL transactions.
988 * We store data in the log buffers if it's small enough.
989 * Otherwise we will later flush the data out via dmu_sync().
991 ssize_t zvol_immediate_write_sz = 32768;
994 zvol_log_write(zvol_state_t *zv, dmu_tx_t *tx, offset_t off, ssize_t resid,
997 uint32_t blocksize = zv->zv_volblocksize;
998 zilog_t *zilog = zv->zv_zilog;
1004 if (zilog->zl_replay) {
1005 dsl_dataset_dirty(dmu_objset_ds(zilog->zl_os), tx);
1006 zilog->zl_replayed_seq[dmu_tx_get_txg(tx) & TXG_MASK] =
1007 zilog->zl_replaying_seq;
1011 slogging = spa_has_slogs(zilog->zl_spa);
1017 itx_wr_state_t write_state;
1020 * Unlike zfs_log_write() we can be called with
1021 * upto DMU_MAX_ACCESS/2 (5MB) writes.
1023 if (blocksize > zvol_immediate_write_sz && !slogging &&
1024 resid >= blocksize && off % blocksize == 0) {
1025 write_state = WR_INDIRECT; /* uses dmu_sync */
1028 write_state = WR_COPIED;
1029 len = MIN(ZIL_MAX_LOG_DATA, resid);
1031 write_state = WR_NEED_COPY;
1032 len = MIN(ZIL_MAX_LOG_DATA, resid);
1035 itx = zil_itx_create(TX_WRITE, sizeof (*lr) +
1036 (write_state == WR_COPIED ? len : 0));
1037 lr = (lr_write_t *)&itx->itx_lr;
1038 if (write_state == WR_COPIED && dmu_read(zv->zv_objset,
1039 ZVOL_OBJ, off, len, lr + 1, DMU_READ_NO_PREFETCH) != 0) {
1040 kmem_free(itx, offsetof(itx_t, itx_lr) +
1041 itx->itx_lr.lrc_reclen);
1042 itx = zil_itx_create(TX_WRITE, sizeof (*lr));
1043 lr = (lr_write_t *)&itx->itx_lr;
1044 write_state = WR_NEED_COPY;
1047 itx->itx_wr_state = write_state;
1048 if (write_state == WR_NEED_COPY)
1049 itx->itx_sod += len;
1050 lr->lr_foid = ZVOL_OBJ;
1051 lr->lr_offset = off;
1052 lr->lr_length = len;
1053 lr->lr_blkoff = off - P2ALIGN_TYPED(off, blocksize, uint64_t);
1054 BP_ZERO(&lr->lr_blkptr);
1056 itx->itx_private = zv;
1057 itx->itx_sync = sync;
1059 (void) zil_itx_assign(zilog, itx, tx);
1067 zvol_dumpio_vdev(vdev_t *vd, void *addr, uint64_t offset, uint64_t size,
1068 boolean_t doread, boolean_t isdump)
1074 for (c = 0; c < vd->vdev_children; c++) {
1075 ASSERT(vd->vdev_ops == &vdev_mirror_ops ||
1076 vd->vdev_ops == &vdev_replacing_ops ||
1077 vd->vdev_ops == &vdev_spare_ops);
1078 int err = zvol_dumpio_vdev(vd->vdev_child[c],
1079 addr, offset, size, doread, isdump);
1082 } else if (doread) {
1087 if (!vd->vdev_ops->vdev_op_leaf)
1088 return (numerrors < vd->vdev_children ? 0 : EIO);
1090 if (doread && !vdev_readable(vd))
1092 else if (!doread && !vdev_writeable(vd))
1096 ASSERT3P(dvd, !=, NULL);
1097 offset += VDEV_LABEL_START_SIZE;
1099 if (ddi_in_panic() || isdump) {
1103 return (ldi_dump(dvd->vd_lh, addr, lbtodb(offset),
1106 return (vdev_disk_physio(dvd->vd_lh, addr, size, offset,
1107 doread ? B_READ : B_WRITE));
1112 zvol_dumpio(zvol_state_t *zv, void *addr, uint64_t offset, uint64_t size,
1113 boolean_t doread, boolean_t isdump)
1118 spa_t *spa = dmu_objset_spa(zv->zv_objset);
1120 /* Must be sector aligned, and not stradle a block boundary. */
1121 if (P2PHASE(offset, DEV_BSIZE) || P2PHASE(size, DEV_BSIZE) ||
1122 P2BOUNDARY(offset, size, zv->zv_volblocksize)) {
1125 ASSERT(size <= zv->zv_volblocksize);
1127 /* Locate the extent this belongs to */
1128 ze = list_head(&zv->zv_extents);
1129 while (offset >= ze->ze_nblks * zv->zv_volblocksize) {
1130 offset -= ze->ze_nblks * zv->zv_volblocksize;
1131 ze = list_next(&zv->zv_extents, ze);
1133 spa_config_enter(spa, SCL_STATE, FTAG, RW_READER);
1134 vd = vdev_lookup_top(spa, DVA_GET_VDEV(&ze->ze_dva));
1135 offset += DVA_GET_OFFSET(&ze->ze_dva);
1136 error = zvol_dumpio_vdev(vd, addr, offset, size, doread, isdump);
1137 spa_config_exit(spa, SCL_STATE, FTAG);
1142 zvol_strategy(buf_t *bp)
1144 zvol_state_t *zv = ddi_get_soft_state(zvol_state, getminor(bp->b_edev));
1145 uint64_t off, volsize;
1151 boolean_t doread = bp->b_flags & B_READ;
1152 boolean_t is_dump = zv->zv_flags & ZVOL_DUMPIFIED;
1156 bioerror(bp, ENXIO);
1161 if (getminor(bp->b_edev) == 0) {
1162 bioerror(bp, EINVAL);
1167 if (!(bp->b_flags & B_READ) &&
1168 (zv->zv_flags & ZVOL_RDONLY ||
1169 zv->zv_mode & DS_MODE_READONLY)) {
1170 bioerror(bp, EROFS);
1175 off = ldbtob(bp->b_blkno);
1176 volsize = zv->zv_volsize;
1182 addr = bp->b_un.b_addr;
1183 resid = bp->b_bcount;
1185 if (resid > 0 && (off < 0 || off >= volsize)) {
1191 sync = !(bp->b_flags & B_ASYNC) && !doread && !is_dump &&
1192 !(zv->zv_flags & ZVOL_WCE) && !zil_disable;
1195 * There must be no buffer changes when doing a dmu_sync() because
1196 * we can't change the data whilst calculating the checksum.
1198 rl = zfs_range_lock(&zv->zv_znode, off, resid,
1199 doread ? RL_READER : RL_WRITER);
1201 while (resid != 0 && off < volsize) {
1202 size_t size = MIN(resid, zvol_maxphys);
1204 size = MIN(size, P2END(off, zv->zv_volblocksize) - off);
1205 error = zvol_dumpio(zv, addr, off, size,
1207 } else if (doread) {
1208 error = dmu_read(os, ZVOL_OBJ, off, size, addr,
1211 dmu_tx_t *tx = dmu_tx_create(os);
1212 dmu_tx_hold_write(tx, ZVOL_OBJ, off, size);
1213 error = dmu_tx_assign(tx, TXG_WAIT);
1217 dmu_write(os, ZVOL_OBJ, off, size, addr, tx);
1218 zvol_log_write(zv, tx, off, size, sync);
1223 /* convert checksum errors into IO errors */
1224 if (error == ECKSUM)
1232 zfs_range_unlock(rl);
1234 if ((bp->b_resid = resid) == bp->b_bcount)
1235 bioerror(bp, off > volsize ? EINVAL : error);
1238 zil_commit(zv->zv_zilog, UINT64_MAX, ZVOL_OBJ);
1245 * Set the buffer count to the zvol maximum transfer.
1246 * Using our own routine instead of the default minphys()
1247 * means that for larger writes we write bigger buffers on X86
1248 * (128K instead of 56K) and flush the disk write cache less often
1249 * (every zvol_maxphys - currently 1MB) instead of minphys (currently
1250 * 56K on X86 and 128K on sparc).
1253 zvol_minphys(struct buf *bp)
1255 if (bp->b_bcount > zvol_maxphys)
1256 bp->b_bcount = zvol_maxphys;
1260 zvol_dump(dev_t dev, caddr_t addr, daddr_t blkno, int nblocks)
1262 minor_t minor = getminor(dev);
1269 if (minor == 0) /* This is the control device */
1272 zv = ddi_get_soft_state(zvol_state, minor);
1276 boff = ldbtob(blkno);
1277 resid = ldbtob(nblocks);
1279 VERIFY3U(boff + resid, <=, zv->zv_volsize);
1282 size = MIN(resid, P2END(boff, zv->zv_volblocksize) - boff);
1283 error = zvol_dumpio(zv, addr, boff, size, B_FALSE, B_TRUE);
1296 zvol_read(dev_t dev, uio_t *uio, cred_t *cr)
1298 minor_t minor = getminor(dev);
1304 if (minor == 0) /* This is the control device */
1307 zv = ddi_get_soft_state(zvol_state, minor);
1311 volsize = zv->zv_volsize;
1312 if (uio->uio_resid > 0 &&
1313 (uio->uio_loffset < 0 || uio->uio_loffset >= volsize))
1316 if (zv->zv_flags & ZVOL_DUMPIFIED) {
1317 error = physio(zvol_strategy, NULL, dev, B_READ,
1322 rl = zfs_range_lock(&zv->zv_znode, uio->uio_loffset, uio->uio_resid,
1324 while (uio->uio_resid > 0 && uio->uio_loffset < volsize) {
1325 uint64_t bytes = MIN(uio->uio_resid, DMU_MAX_ACCESS >> 1);
1327 /* don't read past the end */
1328 if (bytes > volsize - uio->uio_loffset)
1329 bytes = volsize - uio->uio_loffset;
1331 error = dmu_read_uio(zv->zv_objset, ZVOL_OBJ, uio, bytes);
1333 /* convert checksum errors into IO errors */
1334 if (error == ECKSUM)
1339 zfs_range_unlock(rl);
1345 zvol_write(dev_t dev, uio_t *uio, cred_t *cr)
1347 minor_t minor = getminor(dev);
1354 if (minor == 0) /* This is the control device */
1357 zv = ddi_get_soft_state(zvol_state, minor);
1361 volsize = zv->zv_volsize;
1362 if (uio->uio_resid > 0 &&
1363 (uio->uio_loffset < 0 || uio->uio_loffset >= volsize))
1366 if (zv->zv_flags & ZVOL_DUMPIFIED) {
1367 error = physio(zvol_strategy, NULL, dev, B_WRITE,
1372 sync = !(zv->zv_flags & ZVOL_WCE) && !zil_disable;
1374 rl = zfs_range_lock(&zv->zv_znode, uio->uio_loffset, uio->uio_resid,
1376 while (uio->uio_resid > 0 && uio->uio_loffset < volsize) {
1377 uint64_t bytes = MIN(uio->uio_resid, DMU_MAX_ACCESS >> 1);
1378 uint64_t off = uio->uio_loffset;
1379 dmu_tx_t *tx = dmu_tx_create(zv->zv_objset);
1381 if (bytes > volsize - off) /* don't write past the end */
1382 bytes = volsize - off;
1384 dmu_tx_hold_write(tx, ZVOL_OBJ, off, bytes);
1385 error = dmu_tx_assign(tx, TXG_WAIT);
1390 error = dmu_write_uio(zv->zv_objset, ZVOL_OBJ, uio, bytes, tx);
1392 zvol_log_write(zv, tx, off, bytes, sync);
1398 zfs_range_unlock(rl);
1400 zil_commit(zv->zv_zilog, UINT64_MAX, ZVOL_OBJ);
1405 zvol_getefi(void *arg, int flag, uint64_t vs, uint8_t bs)
1407 struct uuid uuid = EFI_RESERVED;
1408 efi_gpe_t gpe = { 0 };
1414 if (ddi_copyin(arg, &efi, sizeof (dk_efi_t), flag))
1416 ptr = (char *)(uintptr_t)efi.dki_data_64;
1417 length = efi.dki_length;
1419 * Some clients may attempt to request a PMBR for the
1420 * zvol. Currently this interface will return EINVAL to
1421 * such requests. These requests could be supported by
1422 * adding a check for lba == 0 and consing up an appropriate
1425 if (efi.dki_lba < 1 || efi.dki_lba > 2 || length <= 0)
1428 gpe.efi_gpe_StartingLBA = LE_64(34ULL);
1429 gpe.efi_gpe_EndingLBA = LE_64((vs >> bs) - 1);
1430 UUID_LE_CONVERT(gpe.efi_gpe_PartitionTypeGUID, uuid);
1432 if (efi.dki_lba == 1) {
1433 efi_gpt_t gpt = { 0 };
1435 gpt.efi_gpt_Signature = LE_64(EFI_SIGNATURE);
1436 gpt.efi_gpt_Revision = LE_32(EFI_VERSION_CURRENT);
1437 gpt.efi_gpt_HeaderSize = LE_32(sizeof (gpt));
1438 gpt.efi_gpt_MyLBA = LE_64(1ULL);
1439 gpt.efi_gpt_FirstUsableLBA = LE_64(34ULL);
1440 gpt.efi_gpt_LastUsableLBA = LE_64((vs >> bs) - 1);
1441 gpt.efi_gpt_PartitionEntryLBA = LE_64(2ULL);
1442 gpt.efi_gpt_NumberOfPartitionEntries = LE_32(1);
1443 gpt.efi_gpt_SizeOfPartitionEntry =
1444 LE_32(sizeof (efi_gpe_t));
1445 CRC32(crc, &gpe, sizeof (gpe), -1U, crc32_table);
1446 gpt.efi_gpt_PartitionEntryArrayCRC32 = LE_32(~crc);
1447 CRC32(crc, &gpt, sizeof (gpt), -1U, crc32_table);
1448 gpt.efi_gpt_HeaderCRC32 = LE_32(~crc);
1449 if (ddi_copyout(&gpt, ptr, MIN(sizeof (gpt), length),
1452 ptr += sizeof (gpt);
1453 length -= sizeof (gpt);
1455 if (length > 0 && ddi_copyout(&gpe, ptr, MIN(sizeof (gpe),
1462 * Dirtbag ioctls to support mkfs(1M) for UFS filesystems. See dkio(7I).
1466 zvol_ioctl(dev_t dev, int cmd, intptr_t arg, int flag, cred_t *cr, int *rvalp)
1469 struct dk_cinfo dki;
1470 struct dk_minfo dkm;
1471 struct dk_callback *dkc;
1475 mutex_enter(&zvol_state_lock);
1477 zv = ddi_get_soft_state(zvol_state, getminor(dev));
1480 mutex_exit(&zvol_state_lock);
1483 ASSERT(zv->zv_total_opens > 0);
1488 bzero(&dki, sizeof (dki));
1489 (void) strcpy(dki.dki_cname, "zvol");
1490 (void) strcpy(dki.dki_dname, "zvol");
1491 dki.dki_ctype = DKC_UNKNOWN;
1492 dki.dki_maxtransfer = 1 << (SPA_MAXBLOCKSHIFT - zv->zv_min_bs);
1493 mutex_exit(&zvol_state_lock);
1494 if (ddi_copyout(&dki, (void *)arg, sizeof (dki), flag))
1498 case DKIOCGMEDIAINFO:
1499 bzero(&dkm, sizeof (dkm));
1500 dkm.dki_lbsize = 1U << zv->zv_min_bs;
1501 dkm.dki_capacity = zv->zv_volsize >> zv->zv_min_bs;
1502 dkm.dki_media_type = DK_UNKNOWN;
1503 mutex_exit(&zvol_state_lock);
1504 if (ddi_copyout(&dkm, (void *)arg, sizeof (dkm), flag))
1510 uint64_t vs = zv->zv_volsize;
1511 uint8_t bs = zv->zv_min_bs;
1513 mutex_exit(&zvol_state_lock);
1514 error = zvol_getefi((void *)arg, flag, vs, bs);
1518 case DKIOCFLUSHWRITECACHE:
1519 dkc = (struct dk_callback *)arg;
1520 mutex_exit(&zvol_state_lock);
1521 zil_commit(zv->zv_zilog, UINT64_MAX, ZVOL_OBJ);
1522 if ((flag & FKIOCTL) && dkc != NULL && dkc->dkc_callback) {
1523 (*dkc->dkc_callback)(dkc->dkc_cookie, error);
1530 int wce = (zv->zv_flags & ZVOL_WCE) ? 1 : 0;
1531 if (ddi_copyout(&wce, (void *)arg, sizeof (int),
1539 if (ddi_copyin((void *)arg, &wce, sizeof (int),
1545 zv->zv_flags |= ZVOL_WCE;
1546 mutex_exit(&zvol_state_lock);
1548 zv->zv_flags &= ~ZVOL_WCE;
1549 mutex_exit(&zvol_state_lock);
1550 zil_commit(zv->zv_zilog, UINT64_MAX, ZVOL_OBJ);
1558 * commands using these (like prtvtoc) expect ENOTSUP
1559 * since we're emulating an EFI label
1565 rl = zfs_range_lock(&zv->zv_znode, 0, zv->zv_volsize,
1567 error = zvol_dumpify(zv);
1568 zfs_range_unlock(rl);
1572 if (!(zv->zv_flags & ZVOL_DUMPIFIED))
1574 rl = zfs_range_lock(&zv->zv_znode, 0, zv->zv_volsize,
1576 error = zvol_dump_fini(zv);
1577 zfs_range_unlock(rl);
1585 mutex_exit(&zvol_state_lock);
1592 return (zvol_minors != 0);
1598 VERIFY(ddi_soft_state_init(&zvol_state, sizeof (zvol_state_t), 1) == 0);
1599 mutex_init(&zvol_state_lock, NULL, MUTEX_DEFAULT, NULL);
1605 mutex_destroy(&zvol_state_lock);
1606 ddi_soft_state_fini(&zvol_state);
1610 zvol_is_swap(zvol_state_t *zv)
1613 boolean_t ret = B_FALSE;
1618 devpathlen = strlen(ZVOL_FULL_DEV_DIR) + strlen(zv->zv_name) + 1;
1619 devpath = kmem_alloc(devpathlen, KM_SLEEP);
1620 (void) sprintf(devpath, "%s%s", ZVOL_FULL_DEV_DIR, zv->zv_name);
1621 error = lookupname(devpath, UIO_SYSSPACE, FOLLOW, NULLVPP, &vp);
1622 kmem_free(devpath, devpathlen);
1624 ret = !error && IS_SWAPVP(common_specvp(vp));
1633 zvol_dump_init(zvol_state_t *zv, boolean_t resize)
1637 objset_t *os = zv->zv_objset;
1638 nvlist_t *nv = NULL;
1640 ASSERT(MUTEX_HELD(&zvol_state_lock));
1642 tx = dmu_tx_create(os);
1643 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL);
1644 error = dmu_tx_assign(tx, TXG_WAIT);
1651 * If we are resizing the dump device then we only need to
1652 * update the refreservation to match the newly updated
1653 * zvolsize. Otherwise, we save off the original state of the
1654 * zvol so that we can restore them if the zvol is ever undumpified.
1657 error = zap_update(os, ZVOL_ZAP_OBJ,
1658 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1,
1659 &zv->zv_volsize, tx);
1661 uint64_t checksum, compress, refresrv, vbs;
1663 error = dsl_prop_get_integer(zv->zv_name,
1664 zfs_prop_to_name(ZFS_PROP_COMPRESSION), &compress, NULL);
1665 error = error ? error : dsl_prop_get_integer(zv->zv_name,
1666 zfs_prop_to_name(ZFS_PROP_CHECKSUM), &checksum, NULL);
1667 error = error ? error : dsl_prop_get_integer(zv->zv_name,
1668 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &refresrv, NULL);
1669 error = error ? error : dsl_prop_get_integer(zv->zv_name,
1670 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &vbs, NULL);
1672 error = error ? error : zap_update(os, ZVOL_ZAP_OBJ,
1673 zfs_prop_to_name(ZFS_PROP_COMPRESSION), 8, 1,
1675 error = error ? error : zap_update(os, ZVOL_ZAP_OBJ,
1676 zfs_prop_to_name(ZFS_PROP_CHECKSUM), 8, 1, &checksum, tx);
1677 error = error ? error : zap_update(os, ZVOL_ZAP_OBJ,
1678 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1,
1680 error = error ? error : zap_update(os, ZVOL_ZAP_OBJ,
1681 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), 8, 1,
1686 /* Truncate the file */
1688 error = dmu_free_long_range(zv->zv_objset,
1689 ZVOL_OBJ, 0, DMU_OBJECT_END);
1695 * We only need update the zvol's property if we are initializing
1696 * the dump area for the first time.
1699 VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0);
1700 VERIFY(nvlist_add_uint64(nv,
1701 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 0) == 0);
1702 VERIFY(nvlist_add_uint64(nv,
1703 zfs_prop_to_name(ZFS_PROP_COMPRESSION),
1704 ZIO_COMPRESS_OFF) == 0);
1705 VERIFY(nvlist_add_uint64(nv,
1706 zfs_prop_to_name(ZFS_PROP_CHECKSUM),
1707 ZIO_CHECKSUM_OFF) == 0);
1708 VERIFY(nvlist_add_uint64(nv,
1709 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE),
1710 SPA_MAXBLOCKSIZE) == 0);
1712 error = zfs_set_prop_nvlist(zv->zv_name, nv);
1719 /* Allocate the space for the dump */
1720 error = zvol_prealloc(zv);
1725 zvol_dumpify(zvol_state_t *zv)
1728 uint64_t dumpsize = 0;
1730 objset_t *os = zv->zv_objset;
1732 if (zv->zv_flags & ZVOL_RDONLY || (zv->zv_mode & DS_MODE_READONLY))
1736 * We do not support swap devices acting as dump devices.
1738 if (zvol_is_swap(zv))
1741 if (zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE,
1742 8, 1, &dumpsize) != 0 || dumpsize != zv->zv_volsize) {
1743 boolean_t resize = (dumpsize > 0) ? B_TRUE : B_FALSE;
1745 if ((error = zvol_dump_init(zv, resize)) != 0) {
1746 (void) zvol_dump_fini(zv);
1752 * Build up our lba mapping.
1754 error = zvol_get_lbas(zv);
1756 (void) zvol_dump_fini(zv);
1760 tx = dmu_tx_create(os);
1761 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL);
1762 error = dmu_tx_assign(tx, TXG_WAIT);
1765 (void) zvol_dump_fini(zv);
1769 zv->zv_flags |= ZVOL_DUMPIFIED;
1770 error = zap_update(os, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, 8, 1,
1771 &zv->zv_volsize, tx);
1775 (void) zvol_dump_fini(zv);
1779 txg_wait_synced(dmu_objset_pool(os), 0);
1784 zvol_dump_fini(zvol_state_t *zv)
1787 objset_t *os = zv->zv_objset;
1790 uint64_t checksum, compress, refresrv, vbs;
1793 * Attempt to restore the zvol back to its pre-dumpified state.
1794 * This is a best-effort attempt as it's possible that not all
1795 * of these properties were initialized during the dumpify process
1796 * (i.e. error during zvol_dump_init).
1799 tx = dmu_tx_create(os);
1800 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL);
1801 error = dmu_tx_assign(tx, TXG_WAIT);
1806 (void) zap_remove(os, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, tx);
1809 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ,
1810 zfs_prop_to_name(ZFS_PROP_CHECKSUM), 8, 1, &checksum);
1811 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ,
1812 zfs_prop_to_name(ZFS_PROP_COMPRESSION), 8, 1, &compress);
1813 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ,
1814 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1, &refresrv);
1815 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ,
1816 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), 8, 1, &vbs);
1818 VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0);
1819 (void) nvlist_add_uint64(nv,
1820 zfs_prop_to_name(ZFS_PROP_CHECKSUM), checksum);
1821 (void) nvlist_add_uint64(nv,
1822 zfs_prop_to_name(ZFS_PROP_COMPRESSION), compress);
1823 (void) nvlist_add_uint64(nv,
1824 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), refresrv);
1825 (void) nvlist_add_uint64(nv,
1826 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), vbs);
1827 (void) zfs_set_prop_nvlist(zv->zv_name, nv);
1830 zvol_free_extents(zv);
1831 zv->zv_flags &= ~ZVOL_DUMPIFIED;
1832 (void) dmu_free_long_range(os, ZVOL_OBJ, 0, DMU_OBJECT_END);