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 (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Copyright (c) 2006-2010 Pawel Jakub Dawidek <pjd@FreeBSD.org>
25 * All rights reserved.
27 * Portions Copyright 2010 Robert Milkowski
29 * Copyright 2017 Nexenta Systems, Inc. All rights reserved.
30 * Copyright (c) 2012, 2017 by Delphix. All rights reserved.
31 * Copyright (c) 2013, Joyent, Inc. All rights reserved.
32 * Copyright (c) 2014 Integros [integros.com]
35 /* Portions Copyright 2011 Martin Matuska <mm@FreeBSD.org> */
38 * ZFS volume emulation driver.
40 * Makes a DMU object look like a volume of arbitrary size, up to 2^64 bytes.
41 * Volumes are accessed through the symbolic links named:
43 * /dev/zvol/dsk/<pool_name>/<dataset_name>
44 * /dev/zvol/rdsk/<pool_name>/<dataset_name>
46 * These links are created by the /dev filesystem (sdev_zvolops.c).
47 * Volumes are persistent through reboot. No user command needs to be
48 * run before opening and using a device.
51 * On FreeBSD ZVOLs are simply GEOM providers like any other storage device
55 #include <sys/types.h>
56 #include <sys/param.h>
57 #include <sys/kernel.h>
58 #include <sys/errno.h>
64 #include <sys/cmn_err.h>
68 #include <sys/spa_impl.h>
71 #include <sys/dmu_traverse.h>
72 #include <sys/dnode.h>
73 #include <sys/dsl_dataset.h>
74 #include <sys/dsl_prop.h>
76 #include <sys/byteorder.h>
77 #include <sys/sunddi.h>
78 #include <sys/dirent.h>
79 #include <sys/policy.h>
80 #include <sys/queue.h>
81 #include <sys/fs/zfs.h>
82 #include <sys/zfs_ioctl.h>
84 #include <sys/refcount.h>
85 #include <sys/zfs_znode.h>
86 #include <sys/zfs_rlock.h>
87 #include <sys/vdev_impl.h>
88 #include <sys/vdev_raidz.h>
90 #include <sys/zil_impl.h>
92 #include <sys/dmu_tx.h>
93 #include <sys/zfeature.h>
94 #include <sys/zio_checksum.h>
95 #include <sys/zil_impl.h>
96 #include <sys/filio.h>
97 #include <sys/zfs_rlock.h>
99 #include <geom/geom.h>
101 #include "zfs_namecheck.h"
104 struct g_class zfs_zvol_class = {
106 .version = G_VERSION,
109 DECLARE_GEOM_CLASS(zfs_zvol_class, zfs_zvol);
113 static char *zvol_tag = "zvol_tag";
115 #define ZVOL_DUMPSIZE "dumpsize"
118 * This lock protects the zfsdev_state structure from being modified
119 * while it's being used, e.g. an open that comes in before a create
120 * finishes. It also protects temporary opens of the dataset so that,
121 * e.g., an open doesn't get a spurious EBUSY.
124 kmutex_t zfsdev_state_lock;
127 * In FreeBSD we've replaced the upstream zfsdev_state_lock with the
128 * spa_namespace_lock in the ZVOL code.
130 #define zfsdev_state_lock spa_namespace_lock
132 static uint32_t zvol_minors;
135 SYSCTL_DECL(_vfs_zfs);
136 SYSCTL_NODE(_vfs_zfs, OID_AUTO, vol, CTLFLAG_RW, 0, "ZFS VOLUME");
137 static int volmode = ZFS_VOLMODE_GEOM;
138 SYSCTL_INT(_vfs_zfs_vol, OID_AUTO, mode, CTLFLAG_RWTUN, &volmode, 0,
139 "Expose as GEOM providers (1), device files (2) or neither");
140 static boolean_t zpool_on_zvol = B_FALSE;
141 SYSCTL_INT(_vfs_zfs_vol, OID_AUTO, recursive, CTLFLAG_RWTUN, &zpool_on_zvol, 0,
142 "Allow zpools to use zvols as vdevs (DANGEROUS)");
145 typedef struct zvol_extent {
147 dva_t ze_dva; /* dva associated with this extent */
148 uint64_t ze_nblks; /* number of blocks in extent */
152 * The in-core state of each volume.
154 typedef struct zvol_state {
156 LIST_ENTRY(zvol_state) zv_links;
158 char zv_name[MAXPATHLEN]; /* pool/dd name */
159 uint64_t zv_volsize; /* amount of space we advertise */
160 uint64_t zv_volblocksize; /* volume block size */
162 minor_t zv_minor; /* minor number */
164 struct cdev *zv_dev; /* non-GEOM device */
165 struct g_provider *zv_provider; /* GEOM provider */
167 uint8_t zv_min_bs; /* minimum addressable block shift */
168 uint8_t zv_flags; /* readonly, dumpified, etc. */
169 objset_t *zv_objset; /* objset handle */
171 uint32_t zv_open_count[OTYPCNT]; /* open counts */
173 uint32_t zv_total_opens; /* total open count */
174 uint32_t zv_sync_cnt; /* synchronous open count */
175 zilog_t *zv_zilog; /* ZIL handle */
176 list_t zv_extents; /* List of extents for dump */
177 rangelock_t zv_rangelock;
178 dnode_t *zv_dn; /* dnode hold */
181 int zv_volmode; /* Provide GEOM or cdev */
182 struct bio_queue_head zv_queue;
183 struct mtx zv_queue_mtx; /* zv_queue mutex */
188 static LIST_HEAD(, zvol_state) all_zvols;
191 * zvol specific flags
193 #define ZVOL_RDONLY 0x1
194 #define ZVOL_DUMPIFIED 0x2
195 #define ZVOL_EXCL 0x4
199 * zvol maximum transfer in one DMU tx.
201 int zvol_maxphys = DMU_MAX_ACCESS/2;
204 * Toggle unmap functionality.
206 boolean_t zvol_unmap_enabled = B_TRUE;
209 * If true, unmaps requested as synchronous are executed synchronously,
210 * otherwise all unmaps are asynchronous.
212 boolean_t zvol_unmap_sync_enabled = B_FALSE;
215 SYSCTL_INT(_vfs_zfs_vol, OID_AUTO, unmap_enabled, CTLFLAG_RWTUN,
216 &zvol_unmap_enabled, 0,
217 "Enable UNMAP functionality");
219 SYSCTL_INT(_vfs_zfs_vol, OID_AUTO, unmap_sync_enabled, CTLFLAG_RWTUN,
220 &zvol_unmap_sync_enabled, 0,
221 "UNMAPs requested as sync are executed synchronously");
223 static d_open_t zvol_d_open;
224 static d_close_t zvol_d_close;
225 static d_read_t zvol_read;
226 static d_write_t zvol_write;
227 static d_ioctl_t zvol_d_ioctl;
228 static d_strategy_t zvol_strategy;
230 static struct cdevsw zvol_cdevsw = {
231 .d_version = D_VERSION,
232 .d_open = zvol_d_open,
233 .d_close = zvol_d_close,
235 .d_write = zvol_write,
236 .d_ioctl = zvol_d_ioctl,
237 .d_strategy = zvol_strategy,
239 .d_flags = D_DISK | D_TRACKCLOSE,
242 static void zvol_geom_run(zvol_state_t *zv);
243 static void zvol_geom_destroy(zvol_state_t *zv);
244 static int zvol_geom_access(struct g_provider *pp, int acr, int acw, int ace);
245 static void zvol_geom_start(struct bio *bp);
246 static void zvol_geom_worker(void *arg);
247 static void zvol_log_truncate(zvol_state_t *zv, dmu_tx_t *tx, uint64_t off,
248 uint64_t len, boolean_t sync);
249 #endif /* !illumos */
251 extern int zfs_set_prop_nvlist(const char *, zprop_source_t,
252 nvlist_t *, nvlist_t *);
253 static int zvol_remove_zv(zvol_state_t *);
254 static int zvol_get_data(void *arg, lr_write_t *lr, char *buf,
255 struct lwb *lwb, zio_t *zio);
256 static int zvol_dumpify(zvol_state_t *zv);
257 static int zvol_dump_fini(zvol_state_t *zv);
258 static int zvol_dump_init(zvol_state_t *zv, boolean_t resize);
261 zvol_size_changed(zvol_state_t *zv, uint64_t volsize)
264 dev_t dev = makedevice(ddi_driver_major(zfs_dip), zv->zv_minor);
266 zv->zv_volsize = volsize;
267 VERIFY(ddi_prop_update_int64(dev, zfs_dip,
268 "Size", volsize) == DDI_SUCCESS);
269 VERIFY(ddi_prop_update_int64(dev, zfs_dip,
270 "Nblocks", lbtodb(volsize)) == DDI_SUCCESS);
272 /* Notify specfs to invalidate the cached size */
273 spec_size_invalidate(dev, VBLK);
274 spec_size_invalidate(dev, VCHR);
276 zv->zv_volsize = volsize;
277 if (zv->zv_volmode == ZFS_VOLMODE_GEOM) {
278 struct g_provider *pp;
280 pp = zv->zv_provider;
286 * Do not invoke resize event when initial size was zero.
287 * ZVOL initializes the size on first open, this is not
290 if (pp->mediasize == 0)
291 pp->mediasize = zv->zv_volsize;
293 g_resize_provider(pp, zv->zv_volsize);
300 zvol_check_volsize(uint64_t volsize, uint64_t blocksize)
303 return (SET_ERROR(EINVAL));
305 if (volsize % blocksize != 0)
306 return (SET_ERROR(EINVAL));
309 if (volsize - 1 > SPEC_MAXOFFSET_T)
310 return (SET_ERROR(EOVERFLOW));
316 zvol_check_volblocksize(uint64_t volblocksize)
318 if (volblocksize < SPA_MINBLOCKSIZE ||
319 volblocksize > SPA_OLD_MAXBLOCKSIZE ||
321 return (SET_ERROR(EDOM));
327 zvol_get_stats(objset_t *os, nvlist_t *nv)
330 dmu_object_info_t doi;
333 error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &val);
337 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLSIZE, val);
339 error = dmu_object_info(os, ZVOL_OBJ, &doi);
342 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLBLOCKSIZE,
343 doi.doi_data_block_size);
349 static zvol_state_t *
350 zvol_minor_lookup(const char *name)
357 ASSERT(MUTEX_HELD(&zfsdev_state_lock));
360 for (minor = 1; minor <= ZFSDEV_MAX_MINOR; minor++) {
361 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL);
365 LIST_FOREACH(zv, &all_zvols, zv_links) {
367 if (strcmp(zv->zv_name, name) == 0)
374 /* extent mapping arg */
382 zvol_map_block(spa_t *spa, zilog_t *zilog, const blkptr_t *bp,
383 const zbookmark_phys_t *zb, const dnode_phys_t *dnp, void *arg)
385 struct maparg *ma = arg;
387 int bs = ma->ma_zv->zv_volblocksize;
389 if (bp == NULL || BP_IS_HOLE(bp) ||
390 zb->zb_object != ZVOL_OBJ || zb->zb_level != 0)
393 VERIFY(!BP_IS_EMBEDDED(bp));
395 VERIFY3U(ma->ma_blks, ==, zb->zb_blkid);
398 /* Abort immediately if we have encountered gang blocks */
400 return (SET_ERROR(EFRAGS));
403 * See if the block is at the end of the previous extent.
405 ze = list_tail(&ma->ma_zv->zv_extents);
407 DVA_GET_VDEV(BP_IDENTITY(bp)) == DVA_GET_VDEV(&ze->ze_dva) &&
408 DVA_GET_OFFSET(BP_IDENTITY(bp)) ==
409 DVA_GET_OFFSET(&ze->ze_dva) + ze->ze_nblks * bs) {
414 dprintf_bp(bp, "%s", "next blkptr:");
416 /* start a new extent */
417 ze = kmem_zalloc(sizeof (zvol_extent_t), KM_SLEEP);
418 ze->ze_dva = bp->blk_dva[0]; /* structure assignment */
420 list_insert_tail(&ma->ma_zv->zv_extents, ze);
425 zvol_free_extents(zvol_state_t *zv)
429 while (ze = list_head(&zv->zv_extents)) {
430 list_remove(&zv->zv_extents, ze);
431 kmem_free(ze, sizeof (zvol_extent_t));
436 zvol_get_lbas(zvol_state_t *zv)
438 objset_t *os = zv->zv_objset;
444 zvol_free_extents(zv);
446 /* commit any in-flight changes before traversing the dataset */
447 txg_wait_synced(dmu_objset_pool(os), 0);
448 err = traverse_dataset(dmu_objset_ds(os), 0,
449 TRAVERSE_PRE | TRAVERSE_PREFETCH_METADATA, zvol_map_block, &ma);
450 if (err || ma.ma_blks != (zv->zv_volsize / zv->zv_volblocksize)) {
451 zvol_free_extents(zv);
452 return (err ? err : EIO);
460 zvol_create_cb(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx)
462 zfs_creat_t *zct = arg;
463 nvlist_t *nvprops = zct->zct_props;
465 uint64_t volblocksize, volsize;
467 VERIFY(nvlist_lookup_uint64(nvprops,
468 zfs_prop_to_name(ZFS_PROP_VOLSIZE), &volsize) == 0);
469 if (nvlist_lookup_uint64(nvprops,
470 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &volblocksize) != 0)
471 volblocksize = zfs_prop_default_numeric(ZFS_PROP_VOLBLOCKSIZE);
474 * These properties must be removed from the list so the generic
475 * property setting step won't apply to them.
477 VERIFY(nvlist_remove_all(nvprops,
478 zfs_prop_to_name(ZFS_PROP_VOLSIZE)) == 0);
479 (void) nvlist_remove_all(nvprops,
480 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE));
482 error = dmu_object_claim(os, ZVOL_OBJ, DMU_OT_ZVOL, volblocksize,
486 error = zap_create_claim(os, ZVOL_ZAP_OBJ, DMU_OT_ZVOL_PROP,
490 error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize, tx);
495 * Replay a TX_TRUNCATE ZIL transaction if asked. TX_TRUNCATE is how we
496 * implement DKIOCFREE/free-long-range.
499 zvol_replay_truncate(void *arg1, void *arg2, boolean_t byteswap)
501 zvol_state_t *zv = arg1;
502 lr_truncate_t *lr = arg2;
503 uint64_t offset, length;
506 byteswap_uint64_array(lr, sizeof (*lr));
508 offset = lr->lr_offset;
509 length = lr->lr_length;
511 return (dmu_free_long_range(zv->zv_objset, ZVOL_OBJ, offset, length));
515 * Replay a TX_WRITE ZIL transaction that didn't get committed
516 * after a system failure
519 zvol_replay_write(void *arg1, void *arg2, boolean_t byteswap)
521 zvol_state_t *zv = arg1;
522 lr_write_t *lr = arg2;
523 objset_t *os = zv->zv_objset;
524 char *data = (char *)(lr + 1); /* data follows lr_write_t */
525 uint64_t offset, length;
530 byteswap_uint64_array(lr, sizeof (*lr));
532 offset = lr->lr_offset;
533 length = lr->lr_length;
535 /* If it's a dmu_sync() block, write the whole block */
536 if (lr->lr_common.lrc_reclen == sizeof (lr_write_t)) {
537 uint64_t blocksize = BP_GET_LSIZE(&lr->lr_blkptr);
538 if (length < blocksize) {
539 offset -= offset % blocksize;
544 tx = dmu_tx_create(os);
545 dmu_tx_hold_write(tx, ZVOL_OBJ, offset, length);
546 error = dmu_tx_assign(tx, TXG_WAIT);
550 dmu_write(os, ZVOL_OBJ, offset, length, data, tx);
559 zvol_replay_err(void *arg1, void *arg2, boolean_t byteswap)
561 return (SET_ERROR(ENOTSUP));
565 * Callback vectors for replaying records.
566 * Only TX_WRITE and TX_TRUNCATE are needed for zvol.
568 zil_replay_func_t *zvol_replay_vector[TX_MAX_TYPE] = {
569 zvol_replay_err, /* 0 no such transaction type */
570 zvol_replay_err, /* TX_CREATE */
571 zvol_replay_err, /* TX_MKDIR */
572 zvol_replay_err, /* TX_MKXATTR */
573 zvol_replay_err, /* TX_SYMLINK */
574 zvol_replay_err, /* TX_REMOVE */
575 zvol_replay_err, /* TX_RMDIR */
576 zvol_replay_err, /* TX_LINK */
577 zvol_replay_err, /* TX_RENAME */
578 zvol_replay_write, /* TX_WRITE */
579 zvol_replay_truncate, /* TX_TRUNCATE */
580 zvol_replay_err, /* TX_SETATTR */
581 zvol_replay_err, /* TX_ACL */
582 zvol_replay_err, /* TX_CREATE_ACL */
583 zvol_replay_err, /* TX_CREATE_ATTR */
584 zvol_replay_err, /* TX_CREATE_ACL_ATTR */
585 zvol_replay_err, /* TX_MKDIR_ACL */
586 zvol_replay_err, /* TX_MKDIR_ATTR */
587 zvol_replay_err, /* TX_MKDIR_ACL_ATTR */
588 zvol_replay_err, /* TX_WRITE2 */
593 zvol_name2minor(const char *name, minor_t *minor)
597 mutex_enter(&zfsdev_state_lock);
598 zv = zvol_minor_lookup(name);
600 *minor = zv->zv_minor;
601 mutex_exit(&zfsdev_state_lock);
602 return (zv ? 0 : -1);
607 * Create a minor node (plus a whole lot more) for the specified volume.
610 zvol_create_minor(const char *name)
612 zfs_soft_state_t *zs;
616 dmu_object_info_t doi;
618 char chrbuf[30], blkbuf[30];
620 struct g_provider *pp;
627 ZFS_LOG(1, "Creating ZVOL %s...", name);
630 mutex_enter(&zfsdev_state_lock);
632 if (zvol_minor_lookup(name) != NULL) {
633 mutex_exit(&zfsdev_state_lock);
634 return (SET_ERROR(EEXIST));
637 /* lie and say we're read-only */
638 error = dmu_objset_own(name, DMU_OST_ZVOL, B_TRUE, FTAG, &os);
641 mutex_exit(&zfsdev_state_lock);
646 if ((minor = zfsdev_minor_alloc()) == 0) {
647 dmu_objset_disown(os, FTAG);
648 mutex_exit(&zfsdev_state_lock);
649 return (SET_ERROR(ENXIO));
652 if (ddi_soft_state_zalloc(zfsdev_state, minor) != DDI_SUCCESS) {
653 dmu_objset_disown(os, FTAG);
654 mutex_exit(&zfsdev_state_lock);
655 return (SET_ERROR(EAGAIN));
657 (void) ddi_prop_update_string(minor, zfs_dip, ZVOL_PROP_NAME,
660 (void) snprintf(chrbuf, sizeof (chrbuf), "%u,raw", minor);
662 if (ddi_create_minor_node(zfs_dip, chrbuf, S_IFCHR,
663 minor, DDI_PSEUDO, 0) == DDI_FAILURE) {
664 ddi_soft_state_free(zfsdev_state, minor);
665 dmu_objset_disown(os, FTAG);
666 mutex_exit(&zfsdev_state_lock);
667 return (SET_ERROR(EAGAIN));
670 (void) snprintf(blkbuf, sizeof (blkbuf), "%u", minor);
672 if (ddi_create_minor_node(zfs_dip, blkbuf, S_IFBLK,
673 minor, DDI_PSEUDO, 0) == DDI_FAILURE) {
674 ddi_remove_minor_node(zfs_dip, chrbuf);
675 ddi_soft_state_free(zfsdev_state, minor);
676 dmu_objset_disown(os, FTAG);
677 mutex_exit(&zfsdev_state_lock);
678 return (SET_ERROR(EAGAIN));
681 zs = ddi_get_soft_state(zfsdev_state, minor);
682 zs->zss_type = ZSST_ZVOL;
683 zv = zs->zss_data = kmem_zalloc(sizeof (zvol_state_t), KM_SLEEP);
686 zv = kmem_zalloc(sizeof(*zv), KM_SLEEP);
688 error = dsl_prop_get_integer(name,
689 zfs_prop_to_name(ZFS_PROP_VOLMODE), &mode, NULL);
690 if (error != 0 || mode == ZFS_VOLMODE_DEFAULT)
694 zv->zv_volmode = mode;
695 if (zv->zv_volmode == ZFS_VOLMODE_GEOM) {
697 gp = g_new_geomf(&zfs_zvol_class, "zfs::zvol::%s", name);
698 gp->start = zvol_geom_start;
699 gp->access = zvol_geom_access;
700 pp = g_new_providerf(gp, "%s/%s", ZVOL_DRIVER, name);
701 pp->flags |= G_PF_DIRECT_RECEIVE | G_PF_DIRECT_SEND;
702 pp->sectorsize = DEV_BSIZE;
706 zv->zv_provider = pp;
707 bioq_init(&zv->zv_queue);
708 mtx_init(&zv->zv_queue_mtx, "zvol", NULL, MTX_DEF);
709 } else if (zv->zv_volmode == ZFS_VOLMODE_DEV) {
710 struct make_dev_args args;
712 make_dev_args_init(&args);
713 args.mda_flags = MAKEDEV_CHECKNAME | MAKEDEV_WAITOK;
714 args.mda_devsw = &zvol_cdevsw;
716 args.mda_uid = UID_ROOT;
717 args.mda_gid = GID_OPERATOR;
718 args.mda_mode = 0640;
719 args.mda_si_drv2 = zv;
720 error = make_dev_s(&args, &zv->zv_dev,
721 "%s/%s", ZVOL_DRIVER, name);
723 kmem_free(zv, sizeof(*zv));
724 dmu_objset_disown(os, FTAG);
725 mutex_exit(&zfsdev_state_lock);
728 zv->zv_dev->si_iosize_max = MAXPHYS;
730 LIST_INSERT_HEAD(&all_zvols, zv, zv_links);
733 (void) strlcpy(zv->zv_name, name, MAXPATHLEN);
734 zv->zv_min_bs = DEV_BSHIFT;
736 zv->zv_minor = minor;
739 if (dmu_objset_is_snapshot(os) || !spa_writeable(dmu_objset_spa(os)))
740 zv->zv_flags |= ZVOL_RDONLY;
741 rangelock_init(&zv->zv_rangelock, NULL, NULL);
742 list_create(&zv->zv_extents, sizeof (zvol_extent_t),
743 offsetof(zvol_extent_t, ze_node));
745 /* get and cache the blocksize */
746 error = dmu_object_info(os, ZVOL_OBJ, &doi);
748 zv->zv_volblocksize = doi.doi_data_block_size;
751 if (spa_writeable(dmu_objset_spa(os))) {
752 if (zil_replay_disable)
753 zil_destroy(dmu_objset_zil(os), B_FALSE);
755 zil_replay(os, zv, zvol_replay_vector);
757 dmu_objset_disown(os, FTAG);
758 zv->zv_objset = NULL;
762 mutex_exit(&zfsdev_state_lock);
764 if (zv->zv_volmode == ZFS_VOLMODE_GEOM) {
770 ZFS_LOG(1, "ZVOL %s created.", name);
777 * Remove minor node for the specified volume.
780 zvol_remove_zv(zvol_state_t *zv)
784 minor_t minor = zv->zv_minor;
787 ASSERT(MUTEX_HELD(&zfsdev_state_lock));
788 if (zv->zv_total_opens != 0)
789 return (SET_ERROR(EBUSY));
792 (void) snprintf(nmbuf, sizeof (nmbuf), "%u,raw", minor);
793 ddi_remove_minor_node(zfs_dip, nmbuf);
795 (void) snprintf(nmbuf, sizeof (nmbuf), "%u", minor);
796 ddi_remove_minor_node(zfs_dip, nmbuf);
798 ZFS_LOG(1, "ZVOL %s destroyed.", zv->zv_name);
800 LIST_REMOVE(zv, zv_links);
801 if (zv->zv_volmode == ZFS_VOLMODE_GEOM) {
803 zvol_geom_destroy(zv);
805 } else if (zv->zv_volmode == ZFS_VOLMODE_DEV) {
806 if (zv->zv_dev != NULL)
807 destroy_dev(zv->zv_dev);
811 rangelock_fini(&zv->zv_rangelock);
813 kmem_free(zv, sizeof (zvol_state_t));
815 ddi_soft_state_free(zfsdev_state, minor);
822 zvol_remove_minor(const char *name)
827 mutex_enter(&zfsdev_state_lock);
828 if ((zv = zvol_minor_lookup(name)) == NULL) {
829 mutex_exit(&zfsdev_state_lock);
830 return (SET_ERROR(ENXIO));
832 rc = zvol_remove_zv(zv);
833 mutex_exit(&zfsdev_state_lock);
838 zvol_first_open(zvol_state_t *zv)
840 dmu_object_info_t doi;
846 /* lie and say we're read-only */
847 error = dmu_objset_own(zv->zv_name, DMU_OST_ZVOL, B_TRUE,
853 error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize);
856 dmu_objset_disown(os, zvol_tag);
860 /* get and cache the blocksize */
861 error = dmu_object_info(os, ZVOL_OBJ, &doi);
864 dmu_objset_disown(os, zvol_tag);
867 zv->zv_volblocksize = doi.doi_data_block_size;
869 error = dnode_hold(os, ZVOL_OBJ, zvol_tag, &zv->zv_dn);
871 dmu_objset_disown(os, zvol_tag);
875 zvol_size_changed(zv, volsize);
876 zv->zv_zilog = zil_open(os, zvol_get_data);
878 VERIFY(dsl_prop_get_integer(zv->zv_name, "readonly", &readonly,
880 if (readonly || dmu_objset_is_snapshot(os) ||
881 !spa_writeable(dmu_objset_spa(os)))
882 zv->zv_flags |= ZVOL_RDONLY;
884 zv->zv_flags &= ~ZVOL_RDONLY;
889 zvol_last_close(zvol_state_t *zv)
891 zil_close(zv->zv_zilog);
894 dnode_rele(zv->zv_dn, zvol_tag);
900 if (dsl_dataset_is_dirty(dmu_objset_ds(zv->zv_objset)) &&
901 !(zv->zv_flags & ZVOL_RDONLY))
902 txg_wait_synced(dmu_objset_pool(zv->zv_objset), 0);
903 dmu_objset_evict_dbufs(zv->zv_objset);
905 dmu_objset_disown(zv->zv_objset, zvol_tag);
906 zv->zv_objset = NULL;
911 zvol_prealloc(zvol_state_t *zv)
913 objset_t *os = zv->zv_objset;
915 uint64_t refd, avail, usedobjs, availobjs;
916 uint64_t resid = zv->zv_volsize;
919 /* Check the space usage before attempting to allocate the space */
920 dmu_objset_space(os, &refd, &avail, &usedobjs, &availobjs);
921 if (avail < zv->zv_volsize)
922 return (SET_ERROR(ENOSPC));
924 /* Free old extents if they exist */
925 zvol_free_extents(zv);
929 uint64_t bytes = MIN(resid, SPA_OLD_MAXBLOCKSIZE);
931 tx = dmu_tx_create(os);
932 dmu_tx_hold_write(tx, ZVOL_OBJ, off, bytes);
933 error = dmu_tx_assign(tx, TXG_WAIT);
936 (void) dmu_free_long_range(os, ZVOL_OBJ, 0, off);
939 dmu_prealloc(os, ZVOL_OBJ, off, bytes, tx);
944 txg_wait_synced(dmu_objset_pool(os), 0);
951 zvol_update_volsize(objset_t *os, uint64_t volsize)
956 ASSERT(MUTEX_HELD(&zfsdev_state_lock));
958 tx = dmu_tx_create(os);
959 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL);
960 dmu_tx_mark_netfree(tx);
961 error = dmu_tx_assign(tx, TXG_WAIT);
967 error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1,
972 error = dmu_free_long_range(os,
973 ZVOL_OBJ, volsize, DMU_OBJECT_END);
978 zvol_remove_minors(const char *name)
985 namebuf = kmem_zalloc(strlen(name) + 2, KM_SLEEP);
986 (void) strncpy(namebuf, name, strlen(name));
987 (void) strcat(namebuf, "/");
988 mutex_enter(&zfsdev_state_lock);
989 for (minor = 1; minor <= ZFSDEV_MAX_MINOR; minor++) {
991 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL);
994 if (strncmp(namebuf, zv->zv_name, strlen(namebuf)) == 0)
995 (void) zvol_remove_zv(zv);
997 kmem_free(namebuf, strlen(name) + 2);
999 mutex_exit(&zfsdev_state_lock);
1000 #else /* !illumos */
1001 zvol_state_t *zv, *tzv;
1004 namelen = strlen(name);
1007 mutex_enter(&zfsdev_state_lock);
1009 LIST_FOREACH_SAFE(zv, &all_zvols, zv_links, tzv) {
1010 if (strcmp(zv->zv_name, name) == 0 ||
1011 (strncmp(zv->zv_name, name, namelen) == 0 &&
1012 strlen(zv->zv_name) > namelen && (zv->zv_name[namelen] == '/' ||
1013 zv->zv_name[namelen] == '@'))) {
1014 (void) zvol_remove_zv(zv);
1018 mutex_exit(&zfsdev_state_lock);
1020 #endif /* illumos */
1024 zvol_update_live_volsize(zvol_state_t *zv, uint64_t volsize)
1026 uint64_t old_volsize = 0ULL;
1029 ASSERT(MUTEX_HELD(&zfsdev_state_lock));
1032 * Reinitialize the dump area to the new size. If we
1033 * failed to resize the dump area then restore it back to
1034 * its original size. We must set the new volsize prior
1035 * to calling dumpvp_resize() to ensure that the devices'
1036 * size(9P) is not visible by the dump subsystem.
1038 old_volsize = zv->zv_volsize;
1039 zvol_size_changed(zv, volsize);
1042 if (zv->zv_flags & ZVOL_DUMPIFIED) {
1043 if ((error = zvol_dumpify(zv)) != 0 ||
1044 (error = dumpvp_resize()) != 0) {
1047 (void) zvol_update_volsize(zv->zv_objset, old_volsize);
1048 zvol_size_changed(zv, old_volsize);
1049 dumpify_error = zvol_dumpify(zv);
1050 error = dumpify_error ? dumpify_error : error;
1053 #endif /* ZVOL_DUMP */
1057 * Generate a LUN expansion event.
1062 char *physpath = kmem_zalloc(MAXPATHLEN, KM_SLEEP);
1064 (void) snprintf(physpath, MAXPATHLEN, "%s%u", ZVOL_PSEUDO_DEV,
1067 VERIFY(nvlist_alloc(&attr, NV_UNIQUE_NAME, KM_SLEEP) == 0);
1068 VERIFY(nvlist_add_string(attr, DEV_PHYS_PATH, physpath) == 0);
1070 (void) ddi_log_sysevent(zfs_dip, SUNW_VENDOR, EC_DEV_STATUS,
1071 ESC_DEV_DLE, attr, &eid, DDI_SLEEP);
1074 kmem_free(physpath, MAXPATHLEN);
1076 #endif /* illumos */
1081 zvol_set_volsize(const char *name, uint64_t volsize)
1083 zvol_state_t *zv = NULL;
1086 dmu_object_info_t doi;
1088 boolean_t owned = B_FALSE;
1090 error = dsl_prop_get_integer(name,
1091 zfs_prop_to_name(ZFS_PROP_READONLY), &readonly, NULL);
1095 return (SET_ERROR(EROFS));
1097 mutex_enter(&zfsdev_state_lock);
1098 zv = zvol_minor_lookup(name);
1100 if (zv == NULL || zv->zv_objset == NULL) {
1101 if ((error = dmu_objset_own(name, DMU_OST_ZVOL, B_FALSE,
1103 mutex_exit(&zfsdev_state_lock);
1113 if ((error = dmu_object_info(os, ZVOL_OBJ, &doi)) != 0 ||
1114 (error = zvol_check_volsize(volsize, doi.doi_data_block_size)) != 0)
1117 error = zvol_update_volsize(os, volsize);
1119 if (error == 0 && zv != NULL)
1120 error = zvol_update_live_volsize(zv, volsize);
1123 dmu_objset_disown(os, FTAG);
1125 zv->zv_objset = NULL;
1127 mutex_exit(&zfsdev_state_lock);
1134 zvol_open(dev_t *devp, int flag, int otyp, cred_t *cr)
1137 zvol_open(struct g_provider *pp, int flag, int count)
1144 mutex_enter(&zfsdev_state_lock);
1146 zv = zfsdev_get_soft_state(getminor(*devp), ZSST_ZVOL);
1148 mutex_exit(&zfsdev_state_lock);
1149 return (SET_ERROR(ENXIO));
1152 if (zv->zv_total_opens == 0)
1153 err = zvol_first_open(zv);
1155 mutex_exit(&zfsdev_state_lock);
1158 #else /* !illumos */
1159 boolean_t locked = B_FALSE;
1161 if (!zpool_on_zvol && tsd_get(zfs_geom_probe_vdev_key) != NULL) {
1163 * if zfs_geom_probe_vdev_key is set, that means that zfs is
1164 * attempting to probe geom providers while looking for a
1165 * replacement for a missing VDEV. In this case, the
1166 * spa_namespace_lock will not be held, but it is still illegal
1167 * to use a zvol as a vdev. Deadlocks can result if another
1168 * thread has spa_namespace_lock
1170 return (EOPNOTSUPP);
1173 * Protect against recursively entering spa_namespace_lock
1174 * when spa_open() is used for a pool on a (local) ZVOL(s).
1175 * This is needed since we replaced upstream zfsdev_state_lock
1176 * with spa_namespace_lock in the ZVOL code.
1177 * We are using the same trick as spa_open().
1178 * Note that calls in zvol_first_open which need to resolve
1179 * pool name to a spa object will enter spa_open()
1180 * recursively, but that function already has all the
1181 * necessary protection.
1183 if (!MUTEX_HELD(&zfsdev_state_lock)) {
1184 mutex_enter(&zfsdev_state_lock);
1191 mutex_exit(&zfsdev_state_lock);
1192 return (SET_ERROR(ENXIO));
1195 if (zv->zv_total_opens == 0) {
1196 err = zvol_first_open(zv);
1199 mutex_exit(&zfsdev_state_lock);
1202 pp->mediasize = zv->zv_volsize;
1203 pp->stripeoffset = 0;
1204 pp->stripesize = zv->zv_volblocksize;
1206 #endif /* illumos */
1207 if ((flag & FWRITE) && (zv->zv_flags & ZVOL_RDONLY)) {
1208 err = SET_ERROR(EROFS);
1211 if (zv->zv_flags & ZVOL_EXCL) {
1212 err = SET_ERROR(EBUSY);
1217 if (zv->zv_total_opens != 0) {
1218 err = SET_ERROR(EBUSY);
1221 zv->zv_flags |= ZVOL_EXCL;
1226 if (zv->zv_open_count[otyp] == 0 || otyp == OTYP_LYR) {
1227 zv->zv_open_count[otyp]++;
1228 zv->zv_total_opens++;
1230 mutex_exit(&zfsdev_state_lock);
1232 zv->zv_total_opens += count;
1234 mutex_exit(&zfsdev_state_lock);
1239 if (zv->zv_total_opens == 0)
1240 zvol_last_close(zv);
1242 mutex_exit(&zfsdev_state_lock);
1245 mutex_exit(&zfsdev_state_lock);
1253 zvol_close(dev_t dev, int flag, int otyp, cred_t *cr)
1255 minor_t minor = getminor(dev);
1259 mutex_enter(&zfsdev_state_lock);
1261 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL);
1263 mutex_exit(&zfsdev_state_lock);
1264 #else /* !illumos */
1266 zvol_close(struct g_provider *pp, int flag, int count)
1270 boolean_t locked = B_FALSE;
1272 /* See comment in zvol_open(). */
1273 if (!MUTEX_HELD(&zfsdev_state_lock)) {
1274 mutex_enter(&zfsdev_state_lock);
1281 mutex_exit(&zfsdev_state_lock);
1282 #endif /* illumos */
1283 return (SET_ERROR(ENXIO));
1286 if (zv->zv_flags & ZVOL_EXCL) {
1287 ASSERT(zv->zv_total_opens == 1);
1288 zv->zv_flags &= ~ZVOL_EXCL;
1292 * If the open count is zero, this is a spurious close.
1293 * That indicates a bug in the kernel / DDI framework.
1296 ASSERT(zv->zv_open_count[otyp] != 0);
1298 ASSERT(zv->zv_total_opens != 0);
1301 * You may get multiple opens, but only one close.
1304 zv->zv_open_count[otyp]--;
1305 zv->zv_total_opens--;
1307 zv->zv_total_opens -= count;
1310 if (zv->zv_total_opens == 0)
1311 zvol_last_close(zv);
1314 mutex_exit(&zfsdev_state_lock);
1317 mutex_exit(&zfsdev_state_lock);
1324 zvol_get_done(zgd_t *zgd, int error)
1327 dmu_buf_rele(zgd->zgd_db, zgd);
1329 rangelock_exit(zgd->zgd_lr);
1331 kmem_free(zgd, sizeof (zgd_t));
1335 * Get data to generate a TX_WRITE intent log record.
1338 zvol_get_data(void *arg, lr_write_t *lr, char *buf, struct lwb *lwb, zio_t *zio)
1340 zvol_state_t *zv = arg;
1341 uint64_t offset = lr->lr_offset;
1342 uint64_t size = lr->lr_length; /* length of user data */
1347 ASSERT3P(lwb, !=, NULL);
1348 ASSERT3P(zio, !=, NULL);
1349 ASSERT3U(size, !=, 0);
1351 zgd = kmem_zalloc(sizeof (zgd_t), KM_SLEEP);
1355 * Write records come in two flavors: immediate and indirect.
1356 * For small writes it's cheaper to store the data with the
1357 * log record (immediate); for large writes it's cheaper to
1358 * sync the data and get a pointer to it (indirect) so that
1359 * we don't have to write the data twice.
1361 if (buf != NULL) { /* immediate write */
1362 zgd->zgd_lr = rangelock_enter(&zv->zv_rangelock, offset, size,
1364 error = dmu_read_by_dnode(zv->zv_dn, offset, size, buf,
1365 DMU_READ_NO_PREFETCH);
1366 } else { /* indirect write */
1368 * Have to lock the whole block to ensure when it's written out
1369 * and its checksum is being calculated that no one can change
1370 * the data. Contrarily to zfs_get_data we need not re-check
1371 * blocksize after we get the lock because it cannot be changed.
1373 size = zv->zv_volblocksize;
1374 offset = P2ALIGN(offset, size);
1375 zgd->zgd_lr = rangelock_enter(&zv->zv_rangelock, offset, size,
1377 error = dmu_buf_hold_by_dnode(zv->zv_dn, offset, zgd, &db,
1378 DMU_READ_NO_PREFETCH);
1380 blkptr_t *bp = &lr->lr_blkptr;
1385 ASSERT(db->db_offset == offset);
1386 ASSERT(db->db_size == size);
1388 error = dmu_sync(zio, lr->lr_common.lrc_txg,
1389 zvol_get_done, zgd);
1396 zvol_get_done(zgd, error);
1402 * zvol_log_write() handles synchronous writes using TX_WRITE ZIL transactions.
1404 * We store data in the log buffers if it's small enough.
1405 * Otherwise we will later flush the data out via dmu_sync().
1407 ssize_t zvol_immediate_write_sz = 32768;
1409 SYSCTL_LONG(_vfs_zfs_vol, OID_AUTO, immediate_write_sz, CTLFLAG_RWTUN,
1410 &zvol_immediate_write_sz, 0, "Minimal size for indirect log write");
1414 zvol_log_write(zvol_state_t *zv, dmu_tx_t *tx, offset_t off, ssize_t resid,
1417 uint32_t blocksize = zv->zv_volblocksize;
1418 zilog_t *zilog = zv->zv_zilog;
1419 itx_wr_state_t write_state;
1421 if (zil_replaying(zilog, tx))
1424 if (zilog->zl_logbias == ZFS_LOGBIAS_THROUGHPUT)
1425 write_state = WR_INDIRECT;
1426 else if (!spa_has_slogs(zilog->zl_spa) &&
1427 resid >= blocksize && blocksize > zvol_immediate_write_sz)
1428 write_state = WR_INDIRECT;
1430 write_state = WR_COPIED;
1432 write_state = WR_NEED_COPY;
1437 itx_wr_state_t wr_state = write_state;
1438 ssize_t len = resid;
1440 if (wr_state == WR_COPIED && resid > ZIL_MAX_COPIED_DATA)
1441 wr_state = WR_NEED_COPY;
1442 else if (wr_state == WR_INDIRECT)
1443 len = MIN(blocksize - P2PHASE(off, blocksize), resid);
1445 itx = zil_itx_create(TX_WRITE, sizeof (*lr) +
1446 (wr_state == WR_COPIED ? len : 0));
1447 lr = (lr_write_t *)&itx->itx_lr;
1448 if (wr_state == WR_COPIED && dmu_read_by_dnode(zv->zv_dn,
1449 off, len, lr + 1, DMU_READ_NO_PREFETCH) != 0) {
1450 zil_itx_destroy(itx);
1451 itx = zil_itx_create(TX_WRITE, sizeof (*lr));
1452 lr = (lr_write_t *)&itx->itx_lr;
1453 wr_state = WR_NEED_COPY;
1456 itx->itx_wr_state = wr_state;
1457 lr->lr_foid = ZVOL_OBJ;
1458 lr->lr_offset = off;
1459 lr->lr_length = len;
1461 BP_ZERO(&lr->lr_blkptr);
1463 itx->itx_private = zv;
1465 if (!sync && (zv->zv_sync_cnt == 0))
1466 itx->itx_sync = B_FALSE;
1468 zil_itx_assign(zilog, itx, tx);
1477 zvol_dumpio_vdev(vdev_t *vd, void *addr, uint64_t offset, uint64_t origoffset,
1478 uint64_t size, boolean_t doread, boolean_t isdump)
1484 if (vd->vdev_ops == &vdev_mirror_ops ||
1485 vd->vdev_ops == &vdev_replacing_ops ||
1486 vd->vdev_ops == &vdev_spare_ops) {
1487 for (c = 0; c < vd->vdev_children; c++) {
1488 int err = zvol_dumpio_vdev(vd->vdev_child[c],
1489 addr, offset, origoffset, size, doread, isdump);
1492 } else if (doread) {
1498 if (!vd->vdev_ops->vdev_op_leaf && vd->vdev_ops != &vdev_raidz_ops)
1499 return (numerrors < vd->vdev_children ? 0 : EIO);
1501 if (doread && !vdev_readable(vd))
1502 return (SET_ERROR(EIO));
1503 else if (!doread && !vdev_writeable(vd))
1504 return (SET_ERROR(EIO));
1506 if (vd->vdev_ops == &vdev_raidz_ops) {
1507 return (vdev_raidz_physio(vd,
1508 addr, size, offset, origoffset, doread, isdump));
1511 offset += VDEV_LABEL_START_SIZE;
1513 if (ddi_in_panic() || isdump) {
1516 return (SET_ERROR(EIO));
1518 ASSERT3P(dvd, !=, NULL);
1519 return (ldi_dump(dvd->vd_lh, addr, lbtodb(offset),
1523 ASSERT3P(dvd, !=, NULL);
1524 return (vdev_disk_ldi_physio(dvd->vd_lh, addr, size,
1525 offset, doread ? B_READ : B_WRITE));
1530 zvol_dumpio(zvol_state_t *zv, void *addr, uint64_t offset, uint64_t size,
1531 boolean_t doread, boolean_t isdump)
1536 spa_t *spa = dmu_objset_spa(zv->zv_objset);
1538 /* Must be sector aligned, and not stradle a block boundary. */
1539 if (P2PHASE(offset, DEV_BSIZE) || P2PHASE(size, DEV_BSIZE) ||
1540 P2BOUNDARY(offset, size, zv->zv_volblocksize)) {
1541 return (SET_ERROR(EINVAL));
1543 ASSERT(size <= zv->zv_volblocksize);
1545 /* Locate the extent this belongs to */
1546 ze = list_head(&zv->zv_extents);
1547 while (offset >= ze->ze_nblks * zv->zv_volblocksize) {
1548 offset -= ze->ze_nblks * zv->zv_volblocksize;
1549 ze = list_next(&zv->zv_extents, ze);
1553 return (SET_ERROR(EINVAL));
1555 if (!ddi_in_panic())
1556 spa_config_enter(spa, SCL_STATE, FTAG, RW_READER);
1558 vd = vdev_lookup_top(spa, DVA_GET_VDEV(&ze->ze_dva));
1559 offset += DVA_GET_OFFSET(&ze->ze_dva);
1560 error = zvol_dumpio_vdev(vd, addr, offset, DVA_GET_OFFSET(&ze->ze_dva),
1561 size, doread, isdump);
1563 if (!ddi_in_panic())
1564 spa_config_exit(spa, SCL_STATE, FTAG);
1570 zvol_strategy(buf_t *bp)
1572 zfs_soft_state_t *zs = NULL;
1573 #else /* !illumos */
1575 zvol_strategy(struct bio *bp)
1577 #endif /* illumos */
1579 uint64_t off, volsize;
1585 boolean_t doread = bp->b_flags & B_READ;
1587 boolean_t doread = 0;
1589 boolean_t is_dumpified;
1593 if (getminor(bp->b_edev) == 0) {
1594 error = SET_ERROR(EINVAL);
1596 zs = ddi_get_soft_state(zfsdev_state, getminor(bp->b_edev));
1598 error = SET_ERROR(ENXIO);
1599 else if (zs->zss_type != ZSST_ZVOL)
1600 error = SET_ERROR(EINVAL);
1604 bioerror(bp, error);
1611 if (!(bp->b_flags & B_READ) && (zv->zv_flags & ZVOL_RDONLY)) {
1612 bioerror(bp, EROFS);
1617 off = ldbtob(bp->b_blkno);
1618 #else /* !illumos */
1620 zv = bp->bio_to->private;
1622 zv = bp->bio_dev->si_drv2;
1625 error = SET_ERROR(ENXIO);
1629 if (bp->bio_cmd != BIO_READ && (zv->zv_flags & ZVOL_RDONLY)) {
1630 error = SET_ERROR(EROFS);
1634 switch (bp->bio_cmd) {
1647 off = bp->bio_offset;
1648 #endif /* illumos */
1649 volsize = zv->zv_volsize;
1656 addr = bp->b_un.b_addr;
1657 resid = bp->b_bcount;
1659 if (resid > 0 && (off < 0 || off >= volsize)) {
1665 is_dumpified = zv->zv_flags & ZVOL_DUMPIFIED;
1666 sync = ((!(bp->b_flags & B_ASYNC) &&
1667 !(zv->zv_flags & ZVOL_WCE)) ||
1668 (zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS)) &&
1669 !doread && !is_dumpified;
1670 #else /* !illumos */
1671 addr = bp->bio_data;
1672 resid = bp->bio_length;
1674 if (resid > 0 && (off < 0 || off >= volsize)) {
1675 error = SET_ERROR(EIO);
1679 is_dumpified = B_FALSE;
1680 sync = !doread && !is_dumpified &&
1681 zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS;
1682 #endif /* illumos */
1685 * There must be no buffer changes when doing a dmu_sync() because
1686 * we can't change the data whilst calculating the checksum.
1688 locked_range_t *lr = rangelock_enter(&zv->zv_rangelock, off, resid,
1689 doread ? RL_READER : RL_WRITER);
1692 if (bp->bio_cmd == BIO_DELETE) {
1693 dmu_tx_t *tx = dmu_tx_create(zv->zv_objset);
1694 error = dmu_tx_assign(tx, TXG_WAIT);
1698 zvol_log_truncate(zv, tx, off, resid, sync);
1700 error = dmu_free_long_range(zv->zv_objset, ZVOL_OBJ,
1707 while (resid != 0 && off < volsize) {
1708 size_t size = MIN(resid, zvol_maxphys);
1711 size = MIN(size, P2END(off, zv->zv_volblocksize) - off);
1712 error = zvol_dumpio(zv, addr, off, size,
1714 } else if (doread) {
1718 error = dmu_read(os, ZVOL_OBJ, off, size, addr,
1721 dmu_tx_t *tx = dmu_tx_create(os);
1722 dmu_tx_hold_write(tx, ZVOL_OBJ, off, size);
1723 error = dmu_tx_assign(tx, TXG_WAIT);
1727 dmu_write(os, ZVOL_OBJ, off, size, addr, tx);
1728 zvol_log_write(zv, tx, off, size, sync);
1733 /* convert checksum errors into IO errors */
1734 if (error == ECKSUM)
1735 error = SET_ERROR(EIO);
1748 if ((bp->b_resid = resid) == bp->b_bcount)
1749 bioerror(bp, off > volsize ? EINVAL : error);
1752 zil_commit(zv->zv_zilog, ZVOL_OBJ);
1756 #else /* !illumos */
1757 bp->bio_completed = bp->bio_length - resid;
1758 if (bp->bio_completed < bp->bio_length && off > volsize)
1763 zil_commit(zv->zv_zilog, ZVOL_OBJ);
1767 g_io_deliver(bp, error);
1769 biofinish(bp, NULL, error);
1770 #endif /* illumos */
1775 * Set the buffer count to the zvol maximum transfer.
1776 * Using our own routine instead of the default minphys()
1777 * means that for larger writes we write bigger buffers on X86
1778 * (128K instead of 56K) and flush the disk write cache less often
1779 * (every zvol_maxphys - currently 1MB) instead of minphys (currently
1780 * 56K on X86 and 128K on sparc).
1783 zvol_minphys(struct buf *bp)
1785 if (bp->b_bcount > zvol_maxphys)
1786 bp->b_bcount = zvol_maxphys;
1790 zvol_dump(dev_t dev, caddr_t addr, daddr_t blkno, int nblocks)
1792 minor_t minor = getminor(dev);
1799 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL);
1801 return (SET_ERROR(ENXIO));
1803 if ((zv->zv_flags & ZVOL_DUMPIFIED) == 0)
1804 return (SET_ERROR(EINVAL));
1806 boff = ldbtob(blkno);
1807 resid = ldbtob(nblocks);
1809 VERIFY3U(boff + resid, <=, zv->zv_volsize);
1812 size = MIN(resid, P2END(boff, zv->zv_volblocksize) - boff);
1813 error = zvol_dumpio(zv, addr, boff, size, B_FALSE, B_TRUE);
1826 zvol_read(dev_t dev, uio_t *uio, cred_t *cr)
1828 minor_t minor = getminor(dev);
1829 #else /* !illumos */
1831 zvol_read(struct cdev *dev, struct uio *uio, int ioflag)
1833 #endif /* illumos */
1839 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL);
1841 return (SET_ERROR(ENXIO));
1846 volsize = zv->zv_volsize;
1847 /* uio_loffset == volsize isn't an error as its required for EOF processing. */
1848 if (uio->uio_resid > 0 &&
1849 (uio->uio_loffset < 0 || uio->uio_loffset > volsize))
1850 return (SET_ERROR(EIO));
1853 if (zv->zv_flags & ZVOL_DUMPIFIED) {
1854 error = physio(zvol_strategy, NULL, dev, B_READ,
1860 locked_range_t *lr = rangelock_enter(&zv->zv_rangelock,
1861 uio->uio_loffset, uio->uio_resid, RL_READER);
1862 while (uio->uio_resid > 0 && uio->uio_loffset < volsize) {
1863 uint64_t bytes = MIN(uio->uio_resid, DMU_MAX_ACCESS >> 1);
1865 /* don't read past the end */
1866 if (bytes > volsize - uio->uio_loffset)
1867 bytes = volsize - uio->uio_loffset;
1869 error = dmu_read_uio_dnode(zv->zv_dn, uio, bytes);
1871 /* convert checksum errors into IO errors */
1872 if (error == ECKSUM)
1873 error = SET_ERROR(EIO);
1885 zvol_write(dev_t dev, uio_t *uio, cred_t *cr)
1887 minor_t minor = getminor(dev);
1888 #else /* !illumos */
1890 zvol_write(struct cdev *dev, struct uio *uio, int ioflag)
1892 #endif /* illumos */
1899 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL);
1901 return (SET_ERROR(ENXIO));
1906 volsize = zv->zv_volsize;
1907 /* uio_loffset == volsize isn't an error as its required for EOF processing. */
1908 if (uio->uio_resid > 0 &&
1909 (uio->uio_loffset < 0 || uio->uio_loffset > volsize))
1910 return (SET_ERROR(EIO));
1913 if (zv->zv_flags & ZVOL_DUMPIFIED) {
1914 error = physio(zvol_strategy, NULL, dev, B_WRITE,
1919 sync = !(zv->zv_flags & ZVOL_WCE) ||
1921 sync = (ioflag & IO_SYNC) ||
1923 (zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS);
1925 locked_range_t *lr = rangelock_enter(&zv->zv_rangelock,
1926 uio->uio_loffset, uio->uio_resid, RL_WRITER);
1927 while (uio->uio_resid > 0 && uio->uio_loffset < volsize) {
1928 uint64_t bytes = MIN(uio->uio_resid, DMU_MAX_ACCESS >> 1);
1929 uint64_t off = uio->uio_loffset;
1930 dmu_tx_t *tx = dmu_tx_create(zv->zv_objset);
1932 if (bytes > volsize - off) /* don't write past the end */
1933 bytes = volsize - off;
1935 dmu_tx_hold_write(tx, ZVOL_OBJ, off, bytes);
1936 error = dmu_tx_assign(tx, TXG_WAIT);
1941 error = dmu_write_uio_dnode(zv->zv_dn, uio, bytes, tx);
1943 zvol_log_write(zv, tx, off, bytes, sync);
1952 zil_commit(zv->zv_zilog, ZVOL_OBJ);
1958 zvol_getefi(void *arg, int flag, uint64_t vs, uint8_t bs)
1960 struct uuid uuid = EFI_RESERVED;
1961 efi_gpe_t gpe = { 0 };
1967 if (ddi_copyin(arg, &efi, sizeof (dk_efi_t), flag))
1968 return (SET_ERROR(EFAULT));
1969 ptr = (char *)(uintptr_t)efi.dki_data_64;
1970 length = efi.dki_length;
1972 * Some clients may attempt to request a PMBR for the
1973 * zvol. Currently this interface will return EINVAL to
1974 * such requests. These requests could be supported by
1975 * adding a check for lba == 0 and consing up an appropriate
1978 if (efi.dki_lba < 1 || efi.dki_lba > 2 || length <= 0)
1979 return (SET_ERROR(EINVAL));
1981 gpe.efi_gpe_StartingLBA = LE_64(34ULL);
1982 gpe.efi_gpe_EndingLBA = LE_64((vs >> bs) - 1);
1983 UUID_LE_CONVERT(gpe.efi_gpe_PartitionTypeGUID, uuid);
1985 if (efi.dki_lba == 1) {
1986 efi_gpt_t gpt = { 0 };
1988 gpt.efi_gpt_Signature = LE_64(EFI_SIGNATURE);
1989 gpt.efi_gpt_Revision = LE_32(EFI_VERSION_CURRENT);
1990 gpt.efi_gpt_HeaderSize = LE_32(sizeof (gpt));
1991 gpt.efi_gpt_MyLBA = LE_64(1ULL);
1992 gpt.efi_gpt_FirstUsableLBA = LE_64(34ULL);
1993 gpt.efi_gpt_LastUsableLBA = LE_64((vs >> bs) - 1);
1994 gpt.efi_gpt_PartitionEntryLBA = LE_64(2ULL);
1995 gpt.efi_gpt_NumberOfPartitionEntries = LE_32(1);
1996 gpt.efi_gpt_SizeOfPartitionEntry =
1997 LE_32(sizeof (efi_gpe_t));
1998 CRC32(crc, &gpe, sizeof (gpe), -1U, crc32_table);
1999 gpt.efi_gpt_PartitionEntryArrayCRC32 = LE_32(~crc);
2000 CRC32(crc, &gpt, sizeof (gpt), -1U, crc32_table);
2001 gpt.efi_gpt_HeaderCRC32 = LE_32(~crc);
2002 if (ddi_copyout(&gpt, ptr, MIN(sizeof (gpt), length),
2004 return (SET_ERROR(EFAULT));
2005 ptr += sizeof (gpt);
2006 length -= sizeof (gpt);
2008 if (length > 0 && ddi_copyout(&gpe, ptr, MIN(sizeof (gpe),
2010 return (SET_ERROR(EFAULT));
2015 * BEGIN entry points to allow external callers access to the volume.
2018 * Return the volume parameters needed for access from an external caller.
2019 * These values are invariant as long as the volume is held open.
2022 zvol_get_volume_params(minor_t minor, uint64_t *blksize,
2023 uint64_t *max_xfer_len, void **minor_hdl, void **objset_hdl, void **zil_hdl,
2024 void **rl_hdl, void **dnode_hdl)
2028 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL);
2030 return (SET_ERROR(ENXIO));
2031 if (zv->zv_flags & ZVOL_DUMPIFIED)
2032 return (SET_ERROR(ENXIO));
2034 ASSERT(blksize && max_xfer_len && minor_hdl &&
2035 objset_hdl && zil_hdl && rl_hdl && dnode_hdl);
2037 *blksize = zv->zv_volblocksize;
2038 *max_xfer_len = (uint64_t)zvol_maxphys;
2040 *objset_hdl = zv->zv_objset;
2041 *zil_hdl = zv->zv_zilog;
2042 *rl_hdl = &zv->zv_rangelock;
2043 *dnode_hdl = zv->zv_dn;
2048 * Return the current volume size to an external caller.
2049 * The size can change while the volume is open.
2052 zvol_get_volume_size(void *minor_hdl)
2054 zvol_state_t *zv = minor_hdl;
2056 return (zv->zv_volsize);
2060 * Return the current WCE setting to an external caller.
2061 * The WCE setting can change while the volume is open.
2064 zvol_get_volume_wce(void *minor_hdl)
2066 zvol_state_t *zv = minor_hdl;
2068 return ((zv->zv_flags & ZVOL_WCE) ? 1 : 0);
2072 * Entry point for external callers to zvol_log_write
2075 zvol_log_write_minor(void *minor_hdl, dmu_tx_t *tx, offset_t off, ssize_t resid,
2078 zvol_state_t *zv = minor_hdl;
2080 zvol_log_write(zv, tx, off, resid, sync);
2083 * END entry points to allow external callers access to the volume.
2085 #endif /* illumos */
2088 * Log a DKIOCFREE/free-long-range to the ZIL with TX_TRUNCATE.
2091 zvol_log_truncate(zvol_state_t *zv, dmu_tx_t *tx, uint64_t off, uint64_t len,
2096 zilog_t *zilog = zv->zv_zilog;
2098 if (zil_replaying(zilog, tx))
2101 itx = zil_itx_create(TX_TRUNCATE, sizeof (*lr));
2102 lr = (lr_truncate_t *)&itx->itx_lr;
2103 lr->lr_foid = ZVOL_OBJ;
2104 lr->lr_offset = off;
2105 lr->lr_length = len;
2107 itx->itx_sync = (sync || zv->zv_sync_cnt != 0);
2108 zil_itx_assign(zilog, itx, tx);
2113 * Dirtbag ioctls to support mkfs(1M) for UFS filesystems. See dkio(7I).
2114 * Also a dirtbag dkio ioctl for unmap/free-block functionality.
2118 zvol_ioctl(dev_t dev, int cmd, intptr_t arg, int flag, cred_t *cr, int *rvalp)
2121 struct dk_callback *dkc;
2125 mutex_enter(&zfsdev_state_lock);
2127 zv = zfsdev_get_soft_state(getminor(dev), ZSST_ZVOL);
2130 mutex_exit(&zfsdev_state_lock);
2131 return (SET_ERROR(ENXIO));
2133 ASSERT(zv->zv_total_opens > 0);
2139 struct dk_cinfo dki;
2141 bzero(&dki, sizeof (dki));
2142 (void) strcpy(dki.dki_cname, "zvol");
2143 (void) strcpy(dki.dki_dname, "zvol");
2144 dki.dki_ctype = DKC_UNKNOWN;
2145 dki.dki_unit = getminor(dev);
2146 dki.dki_maxtransfer =
2147 1 << (SPA_OLD_MAXBLOCKSHIFT - zv->zv_min_bs);
2148 mutex_exit(&zfsdev_state_lock);
2149 if (ddi_copyout(&dki, (void *)arg, sizeof (dki), flag))
2150 error = SET_ERROR(EFAULT);
2154 case DKIOCGMEDIAINFO:
2156 struct dk_minfo dkm;
2158 bzero(&dkm, sizeof (dkm));
2159 dkm.dki_lbsize = 1U << zv->zv_min_bs;
2160 dkm.dki_capacity = zv->zv_volsize >> zv->zv_min_bs;
2161 dkm.dki_media_type = DK_UNKNOWN;
2162 mutex_exit(&zfsdev_state_lock);
2163 if (ddi_copyout(&dkm, (void *)arg, sizeof (dkm), flag))
2164 error = SET_ERROR(EFAULT);
2168 case DKIOCGMEDIAINFOEXT:
2170 struct dk_minfo_ext dkmext;
2172 bzero(&dkmext, sizeof (dkmext));
2173 dkmext.dki_lbsize = 1U << zv->zv_min_bs;
2174 dkmext.dki_pbsize = zv->zv_volblocksize;
2175 dkmext.dki_capacity = zv->zv_volsize >> zv->zv_min_bs;
2176 dkmext.dki_media_type = DK_UNKNOWN;
2177 mutex_exit(&zfsdev_state_lock);
2178 if (ddi_copyout(&dkmext, (void *)arg, sizeof (dkmext), flag))
2179 error = SET_ERROR(EFAULT);
2185 uint64_t vs = zv->zv_volsize;
2186 uint8_t bs = zv->zv_min_bs;
2188 mutex_exit(&zfsdev_state_lock);
2189 error = zvol_getefi((void *)arg, flag, vs, bs);
2193 case DKIOCFLUSHWRITECACHE:
2194 dkc = (struct dk_callback *)arg;
2195 mutex_exit(&zfsdev_state_lock);
2196 zil_commit(zv->zv_zilog, ZVOL_OBJ);
2197 if ((flag & FKIOCTL) && dkc != NULL && dkc->dkc_callback) {
2198 (*dkc->dkc_callback)(dkc->dkc_cookie, error);
2205 int wce = (zv->zv_flags & ZVOL_WCE) ? 1 : 0;
2206 if (ddi_copyout(&wce, (void *)arg, sizeof (int),
2208 error = SET_ERROR(EFAULT);
2214 if (ddi_copyin((void *)arg, &wce, sizeof (int),
2216 error = SET_ERROR(EFAULT);
2220 zv->zv_flags |= ZVOL_WCE;
2221 mutex_exit(&zfsdev_state_lock);
2223 zv->zv_flags &= ~ZVOL_WCE;
2224 mutex_exit(&zfsdev_state_lock);
2225 zil_commit(zv->zv_zilog, ZVOL_OBJ);
2233 * commands using these (like prtvtoc) expect ENOTSUP
2234 * since we're emulating an EFI label
2236 error = SET_ERROR(ENOTSUP);
2240 lr = rangelock_enter(&zv->zv_rangelock, 0, zv->zv_volsize,
2242 error = zvol_dumpify(zv);
2247 if (!(zv->zv_flags & ZVOL_DUMPIFIED))
2249 lr = rangelock_enter(&zv->zv_rangelock, 0, zv->zv_volsize,
2251 error = zvol_dump_fini(zv);
2257 dkioc_free_list_t *dfl;
2260 if (!zvol_unmap_enabled)
2263 if (!(flag & FKIOCTL)) {
2264 error = dfl_copyin((void *)arg, &dfl, flag, KM_SLEEP);
2268 dfl = (dkioc_free_list_t *)arg;
2269 ASSERT3U(dfl->dfl_num_exts, <=, DFL_COPYIN_MAX_EXTS);
2270 if (dfl->dfl_num_exts > DFL_COPYIN_MAX_EXTS) {
2271 error = SET_ERROR(EINVAL);
2276 mutex_exit(&zfsdev_state_lock);
2278 for (int i = 0; i < dfl->dfl_num_exts; i++) {
2279 uint64_t start = dfl->dfl_exts[i].dfle_start,
2280 length = dfl->dfl_exts[i].dfle_length,
2281 end = start + length;
2284 * Apply Postel's Law to length-checking. If they
2285 * overshoot, just blank out until the end, if there's
2286 * a need to blank out anything.
2288 if (start >= zv->zv_volsize)
2289 continue; /* No need to do anything... */
2290 if (end > zv->zv_volsize) {
2291 end = DMU_OBJECT_END;
2292 length = end - start;
2295 lr = rangelock_enter(&zv->zv_rangelock, start, length,
2297 tx = dmu_tx_create(zv->zv_objset);
2298 error = dmu_tx_assign(tx, TXG_WAIT);
2302 zvol_log_truncate(zv, tx, start, length,
2305 error = dmu_free_long_range(zv->zv_objset,
2306 ZVOL_OBJ, start, length);
2316 * If the write-cache is disabled, 'sync' property
2317 * is set to 'always', or if the caller is asking for
2318 * a synchronous free, commit this operation to the zil.
2319 * This will sync any previous uncommitted writes to the
2321 * Can be overridden by the zvol_unmap_sync_enabled tunable.
2323 if ((error == 0) && zvol_unmap_sync_enabled &&
2324 (!(zv->zv_flags & ZVOL_WCE) ||
2325 (zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS) ||
2326 (dfl->dfl_flags & DF_WAIT_SYNC))) {
2327 zil_commit(zv->zv_zilog, ZVOL_OBJ);
2330 if (!(flag & FKIOCTL))
2337 error = SET_ERROR(ENOTTY);
2341 mutex_exit(&zfsdev_state_lock);
2344 #endif /* illumos */
2349 return (zvol_minors != 0);
2355 VERIFY(ddi_soft_state_init(&zfsdev_state, sizeof (zfs_soft_state_t),
2358 mutex_init(&zfsdev_state_lock, NULL, MUTEX_DEFAULT, NULL);
2360 ZFS_LOG(1, "ZVOL Initialized.");
2368 mutex_destroy(&zfsdev_state_lock);
2370 ddi_soft_state_fini(&zfsdev_state);
2371 ZFS_LOG(1, "ZVOL Deinitialized.");
2377 zfs_mvdev_dump_feature_check(void *arg, dmu_tx_t *tx)
2379 spa_t *spa = dmu_tx_pool(tx)->dp_spa;
2381 if (spa_feature_is_active(spa, SPA_FEATURE_MULTI_VDEV_CRASH_DUMP))
2388 zfs_mvdev_dump_activate_feature_sync(void *arg, dmu_tx_t *tx)
2390 spa_t *spa = dmu_tx_pool(tx)->dp_spa;
2392 spa_feature_incr(spa, SPA_FEATURE_MULTI_VDEV_CRASH_DUMP, tx);
2396 zvol_dump_init(zvol_state_t *zv, boolean_t resize)
2400 objset_t *os = zv->zv_objset;
2401 spa_t *spa = dmu_objset_spa(os);
2402 vdev_t *vd = spa->spa_root_vdev;
2403 nvlist_t *nv = NULL;
2404 uint64_t version = spa_version(spa);
2405 uint64_t checksum, compress, refresrv, vbs, dedup;
2407 ASSERT(MUTEX_HELD(&zfsdev_state_lock));
2408 ASSERT(vd->vdev_ops == &vdev_root_ops);
2410 error = dmu_free_long_range(zv->zv_objset, ZVOL_OBJ, 0,
2414 /* wait for dmu_free_long_range to actually free the blocks */
2415 txg_wait_synced(dmu_objset_pool(zv->zv_objset), 0);
2418 * If the pool on which the dump device is being initialized has more
2419 * than one child vdev, check that the MULTI_VDEV_CRASH_DUMP feature is
2420 * enabled. If so, bump that feature's counter to indicate that the
2421 * feature is active. We also check the vdev type to handle the
2423 * # zpool create test raidz disk1 disk2 disk3
2424 * Now have spa_root_vdev->vdev_children == 1 (the raidz vdev),
2425 * the raidz vdev itself has 3 children.
2427 if (vd->vdev_children > 1 || vd->vdev_ops == &vdev_raidz_ops) {
2428 if (!spa_feature_is_enabled(spa,
2429 SPA_FEATURE_MULTI_VDEV_CRASH_DUMP))
2430 return (SET_ERROR(ENOTSUP));
2431 (void) dsl_sync_task(spa_name(spa),
2432 zfs_mvdev_dump_feature_check,
2433 zfs_mvdev_dump_activate_feature_sync, NULL,
2434 2, ZFS_SPACE_CHECK_RESERVED);
2438 error = dsl_prop_get_integer(zv->zv_name,
2439 zfs_prop_to_name(ZFS_PROP_COMPRESSION), &compress, NULL);
2441 error = dsl_prop_get_integer(zv->zv_name,
2442 zfs_prop_to_name(ZFS_PROP_CHECKSUM), &checksum,
2446 error = dsl_prop_get_integer(zv->zv_name,
2447 zfs_prop_to_name(ZFS_PROP_REFRESERVATION),
2451 error = dsl_prop_get_integer(zv->zv_name,
2452 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &vbs,
2455 if (version >= SPA_VERSION_DEDUP && error == 0) {
2456 error = dsl_prop_get_integer(zv->zv_name,
2457 zfs_prop_to_name(ZFS_PROP_DEDUP), &dedup, NULL);
2463 tx = dmu_tx_create(os);
2464 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL);
2465 dmu_tx_hold_bonus(tx, ZVOL_OBJ);
2466 error = dmu_tx_assign(tx, TXG_WAIT);
2473 * If we are resizing the dump device then we only need to
2474 * update the refreservation to match the newly updated
2475 * zvolsize. Otherwise, we save off the original state of the
2476 * zvol so that we can restore them if the zvol is ever undumpified.
2479 error = zap_update(os, ZVOL_ZAP_OBJ,
2480 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1,
2481 &zv->zv_volsize, tx);
2483 error = zap_update(os, ZVOL_ZAP_OBJ,
2484 zfs_prop_to_name(ZFS_PROP_COMPRESSION), 8, 1,
2487 error = zap_update(os, ZVOL_ZAP_OBJ,
2488 zfs_prop_to_name(ZFS_PROP_CHECKSUM), 8, 1,
2492 error = zap_update(os, ZVOL_ZAP_OBJ,
2493 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1,
2497 error = zap_update(os, ZVOL_ZAP_OBJ,
2498 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), 8, 1,
2502 error = dmu_object_set_blocksize(
2503 os, ZVOL_OBJ, SPA_OLD_MAXBLOCKSIZE, 0, tx);
2505 if (version >= SPA_VERSION_DEDUP && error == 0) {
2506 error = zap_update(os, ZVOL_ZAP_OBJ,
2507 zfs_prop_to_name(ZFS_PROP_DEDUP), 8, 1,
2511 zv->zv_volblocksize = SPA_OLD_MAXBLOCKSIZE;
2516 * We only need update the zvol's property if we are initializing
2517 * the dump area for the first time.
2519 if (error == 0 && !resize) {
2521 * If MULTI_VDEV_CRASH_DUMP is active, use the NOPARITY checksum
2522 * function. Otherwise, use the old default -- OFF.
2524 checksum = spa_feature_is_active(spa,
2525 SPA_FEATURE_MULTI_VDEV_CRASH_DUMP) ? ZIO_CHECKSUM_NOPARITY :
2528 VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0);
2529 VERIFY(nvlist_add_uint64(nv,
2530 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 0) == 0);
2531 VERIFY(nvlist_add_uint64(nv,
2532 zfs_prop_to_name(ZFS_PROP_COMPRESSION),
2533 ZIO_COMPRESS_OFF) == 0);
2534 VERIFY(nvlist_add_uint64(nv,
2535 zfs_prop_to_name(ZFS_PROP_CHECKSUM),
2537 if (version >= SPA_VERSION_DEDUP) {
2538 VERIFY(nvlist_add_uint64(nv,
2539 zfs_prop_to_name(ZFS_PROP_DEDUP),
2540 ZIO_CHECKSUM_OFF) == 0);
2543 error = zfs_set_prop_nvlist(zv->zv_name, ZPROP_SRC_LOCAL,
2548 /* Allocate the space for the dump */
2550 error = zvol_prealloc(zv);
2555 zvol_dumpify(zvol_state_t *zv)
2558 uint64_t dumpsize = 0;
2560 objset_t *os = zv->zv_objset;
2562 if (zv->zv_flags & ZVOL_RDONLY)
2563 return (SET_ERROR(EROFS));
2565 if (zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE,
2566 8, 1, &dumpsize) != 0 || dumpsize != zv->zv_volsize) {
2567 boolean_t resize = (dumpsize > 0);
2569 if ((error = zvol_dump_init(zv, resize)) != 0) {
2570 (void) zvol_dump_fini(zv);
2576 * Build up our lba mapping.
2578 error = zvol_get_lbas(zv);
2580 (void) zvol_dump_fini(zv);
2584 tx = dmu_tx_create(os);
2585 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL);
2586 error = dmu_tx_assign(tx, TXG_WAIT);
2589 (void) zvol_dump_fini(zv);
2593 zv->zv_flags |= ZVOL_DUMPIFIED;
2594 error = zap_update(os, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, 8, 1,
2595 &zv->zv_volsize, tx);
2599 (void) zvol_dump_fini(zv);
2603 txg_wait_synced(dmu_objset_pool(os), 0);
2608 zvol_dump_fini(zvol_state_t *zv)
2611 objset_t *os = zv->zv_objset;
2614 uint64_t checksum, compress, refresrv, vbs, dedup;
2615 uint64_t version = spa_version(dmu_objset_spa(zv->zv_objset));
2618 * Attempt to restore the zvol back to its pre-dumpified state.
2619 * This is a best-effort attempt as it's possible that not all
2620 * of these properties were initialized during the dumpify process
2621 * (i.e. error during zvol_dump_init).
2624 tx = dmu_tx_create(os);
2625 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL);
2626 error = dmu_tx_assign(tx, TXG_WAIT);
2631 (void) zap_remove(os, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, tx);
2634 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ,
2635 zfs_prop_to_name(ZFS_PROP_CHECKSUM), 8, 1, &checksum);
2636 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ,
2637 zfs_prop_to_name(ZFS_PROP_COMPRESSION), 8, 1, &compress);
2638 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ,
2639 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1, &refresrv);
2640 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ,
2641 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), 8, 1, &vbs);
2643 VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0);
2644 (void) nvlist_add_uint64(nv,
2645 zfs_prop_to_name(ZFS_PROP_CHECKSUM), checksum);
2646 (void) nvlist_add_uint64(nv,
2647 zfs_prop_to_name(ZFS_PROP_COMPRESSION), compress);
2648 (void) nvlist_add_uint64(nv,
2649 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), refresrv);
2650 if (version >= SPA_VERSION_DEDUP &&
2651 zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ,
2652 zfs_prop_to_name(ZFS_PROP_DEDUP), 8, 1, &dedup) == 0) {
2653 (void) nvlist_add_uint64(nv,
2654 zfs_prop_to_name(ZFS_PROP_DEDUP), dedup);
2656 (void) zfs_set_prop_nvlist(zv->zv_name, ZPROP_SRC_LOCAL,
2660 zvol_free_extents(zv);
2661 zv->zv_flags &= ~ZVOL_DUMPIFIED;
2662 (void) dmu_free_long_range(os, ZVOL_OBJ, 0, DMU_OBJECT_END);
2663 /* wait for dmu_free_long_range to actually free the blocks */
2664 txg_wait_synced(dmu_objset_pool(zv->zv_objset), 0);
2665 tx = dmu_tx_create(os);
2666 dmu_tx_hold_bonus(tx, ZVOL_OBJ);
2667 error = dmu_tx_assign(tx, TXG_WAIT);
2672 if (dmu_object_set_blocksize(os, ZVOL_OBJ, vbs, 0, tx) == 0)
2673 zv->zv_volblocksize = vbs;
2678 #else /* !illumos */
2681 zvol_geom_run(zvol_state_t *zv)
2683 struct g_provider *pp;
2685 pp = zv->zv_provider;
2686 g_error_provider(pp, 0);
2688 kproc_kthread_add(zvol_geom_worker, zv, &system_proc, NULL, 0, 0,
2689 "zfskern", "zvol %s", pp->name + sizeof(ZVOL_DRIVER));
2693 zvol_geom_destroy(zvol_state_t *zv)
2695 struct g_provider *pp;
2697 g_topology_assert();
2699 mtx_lock(&zv->zv_queue_mtx);
2701 wakeup_one(&zv->zv_queue);
2702 while (zv->zv_state != 2)
2703 msleep(&zv->zv_state, &zv->zv_queue_mtx, 0, "zvol:w", 0);
2704 mtx_destroy(&zv->zv_queue_mtx);
2706 pp = zv->zv_provider;
2707 zv->zv_provider = NULL;
2709 g_wither_geom(pp->geom, ENXIO);
2713 zvol_geom_access(struct g_provider *pp, int acr, int acw, int ace)
2715 int count, error, flags;
2717 g_topology_assert();
2720 * To make it easier we expect either open or close, but not both
2723 KASSERT((acr >= 0 && acw >= 0 && ace >= 0) ||
2724 (acr <= 0 && acw <= 0 && ace <= 0),
2725 ("Unsupported access request to %s (acr=%d, acw=%d, ace=%d).",
2726 pp->name, acr, acw, ace));
2728 if (pp->private == NULL) {
2729 if (acr <= 0 && acw <= 0 && ace <= 0)
2735 * We don't pass FEXCL flag to zvol_open()/zvol_close() if ace != 0,
2736 * because GEOM already handles that and handles it a bit differently.
2737 * GEOM allows for multiple read/exclusive consumers and ZFS allows
2738 * only one exclusive consumer, no matter if it is reader or writer.
2739 * I like better the way GEOM works so I'll leave it for GEOM to
2740 * decide what to do.
2743 count = acr + acw + ace;
2748 if (acr != 0 || ace != 0)
2753 g_topology_unlock();
2755 error = zvol_open(pp, flags, count);
2757 error = zvol_close(pp, flags, -count);
2763 zvol_geom_start(struct bio *bp)
2768 zv = bp->bio_to->private;
2770 switch (bp->bio_cmd) {
2772 if (!THREAD_CAN_SLEEP())
2774 zil_commit(zv->zv_zilog, ZVOL_OBJ);
2775 g_io_deliver(bp, 0);
2780 if (!THREAD_CAN_SLEEP())
2785 spa_t *spa = dmu_objset_spa(zv->zv_objset);
2786 uint64_t refd, avail, usedobjs, availobjs, val;
2788 if (g_handleattr_int(bp, "GEOM::candelete", 1))
2790 if (strcmp(bp->bio_attribute, "blocksavail") == 0) {
2791 dmu_objset_space(zv->zv_objset, &refd, &avail,
2792 &usedobjs, &availobjs);
2793 if (g_handleattr_off_t(bp, "blocksavail",
2796 } else if (strcmp(bp->bio_attribute, "blocksused") == 0) {
2797 dmu_objset_space(zv->zv_objset, &refd, &avail,
2798 &usedobjs, &availobjs);
2799 if (g_handleattr_off_t(bp, "blocksused",
2802 } else if (strcmp(bp->bio_attribute, "poolblocksavail") == 0) {
2803 avail = metaslab_class_get_space(spa_normal_class(spa));
2804 avail -= metaslab_class_get_alloc(spa_normal_class(spa));
2805 if (g_handleattr_off_t(bp, "poolblocksavail",
2808 } else if (strcmp(bp->bio_attribute, "poolblocksused") == 0) {
2809 refd = metaslab_class_get_alloc(spa_normal_class(spa));
2810 if (g_handleattr_off_t(bp, "poolblocksused",
2817 g_io_deliver(bp, EOPNOTSUPP);
2823 mtx_lock(&zv->zv_queue_mtx);
2824 first = (bioq_first(&zv->zv_queue) == NULL);
2825 bioq_insert_tail(&zv->zv_queue, bp);
2826 mtx_unlock(&zv->zv_queue_mtx);
2828 wakeup_one(&zv->zv_queue);
2832 zvol_geom_worker(void *arg)
2837 thread_lock(curthread);
2838 sched_prio(curthread, PRIBIO);
2839 thread_unlock(curthread);
2843 mtx_lock(&zv->zv_queue_mtx);
2844 bp = bioq_takefirst(&zv->zv_queue);
2846 if (zv->zv_state == 1) {
2848 wakeup(&zv->zv_state);
2849 mtx_unlock(&zv->zv_queue_mtx);
2852 msleep(&zv->zv_queue, &zv->zv_queue_mtx, PRIBIO | PDROP,
2856 mtx_unlock(&zv->zv_queue_mtx);
2857 switch (bp->bio_cmd) {
2859 zil_commit(zv->zv_zilog, ZVOL_OBJ);
2860 g_io_deliver(bp, 0);
2868 g_io_deliver(bp, EOPNOTSUPP);
2874 extern boolean_t dataset_name_hidden(const char *name);
2877 zvol_create_snapshots(objset_t *os, const char *name)
2879 uint64_t cookie, obj;
2884 sname = kmem_alloc(MAXPATHLEN, KM_SLEEP);
2887 (void) dmu_objset_find(name, dmu_objset_prefetch, NULL,
2892 len = snprintf(sname, MAXPATHLEN, "%s@", name);
2893 if (len >= MAXPATHLEN) {
2894 dmu_objset_rele(os, FTAG);
2895 error = ENAMETOOLONG;
2899 dsl_pool_config_enter(dmu_objset_pool(os), FTAG);
2900 error = dmu_snapshot_list_next(os, MAXPATHLEN - len,
2901 sname + len, &obj, &cookie, NULL);
2902 dsl_pool_config_exit(dmu_objset_pool(os), FTAG);
2904 if (error == ENOENT)
2909 error = zvol_create_minor(sname);
2910 if (error != 0 && error != EEXIST) {
2911 printf("ZFS WARNING: Unable to create ZVOL %s (error=%d).\n",
2917 kmem_free(sname, MAXPATHLEN);
2922 zvol_create_minors(const char *name)
2929 if (dataset_name_hidden(name))
2932 if ((error = dmu_objset_hold(name, FTAG, &os)) != 0) {
2933 printf("ZFS WARNING: Unable to put hold on %s (error=%d).\n",
2937 if (dmu_objset_type(os) == DMU_OST_ZVOL) {
2938 dsl_dataset_long_hold(os->os_dsl_dataset, FTAG);
2939 dsl_pool_rele(dmu_objset_pool(os), FTAG);
2940 error = zvol_create_minor(name);
2941 if (error == 0 || error == EEXIST) {
2942 error = zvol_create_snapshots(os, name);
2944 printf("ZFS WARNING: Unable to create ZVOL %s (error=%d).\n",
2947 dsl_dataset_long_rele(os->os_dsl_dataset, FTAG);
2948 dsl_dataset_rele(os->os_dsl_dataset, FTAG);
2951 if (dmu_objset_type(os) != DMU_OST_ZFS) {
2952 dmu_objset_rele(os, FTAG);
2956 osname = kmem_alloc(MAXPATHLEN, KM_SLEEP);
2957 if (snprintf(osname, MAXPATHLEN, "%s/", name) >= MAXPATHLEN) {
2958 dmu_objset_rele(os, FTAG);
2959 kmem_free(osname, MAXPATHLEN);
2962 p = osname + strlen(osname);
2963 len = MAXPATHLEN - (p - osname);
2966 /* Prefetch the datasets. */
2968 while (dmu_dir_list_next(os, len, p, NULL, &cookie) == 0) {
2969 if (!dataset_name_hidden(osname))
2970 (void) dmu_objset_prefetch(osname, NULL);
2975 while (dmu_dir_list_next(os, MAXPATHLEN - (p - osname), p, NULL,
2977 dmu_objset_rele(os, FTAG);
2978 (void)zvol_create_minors(osname);
2979 if ((error = dmu_objset_hold(name, FTAG, &os)) != 0) {
2980 printf("ZFS WARNING: Unable to put hold on %s (error=%d).\n",
2986 dmu_objset_rele(os, FTAG);
2987 kmem_free(osname, MAXPATHLEN);
2992 zvol_rename_minor(zvol_state_t *zv, const char *newname)
2995 struct g_provider *pp;
2998 ASSERT(MUTEX_HELD(&zfsdev_state_lock));
3000 if (zv->zv_volmode == ZFS_VOLMODE_GEOM) {
3002 pp = zv->zv_provider;
3007 zv->zv_provider = NULL;
3008 g_wither_provider(pp, ENXIO);
3010 pp = g_new_providerf(gp, "%s/%s", ZVOL_DRIVER, newname);
3011 pp->flags |= G_PF_DIRECT_RECEIVE | G_PF_DIRECT_SEND;
3012 pp->sectorsize = DEV_BSIZE;
3013 pp->mediasize = zv->zv_volsize;
3015 zv->zv_provider = pp;
3016 g_error_provider(pp, 0);
3017 g_topology_unlock();
3018 } else if (zv->zv_volmode == ZFS_VOLMODE_DEV) {
3019 struct make_dev_args args;
3021 if ((dev = zv->zv_dev) != NULL) {
3024 if (zv->zv_total_opens > 0) {
3025 zv->zv_flags &= ~ZVOL_EXCL;
3026 zv->zv_total_opens = 0;
3027 zvol_last_close(zv);
3031 make_dev_args_init(&args);
3032 args.mda_flags = MAKEDEV_CHECKNAME | MAKEDEV_WAITOK;
3033 args.mda_devsw = &zvol_cdevsw;
3035 args.mda_uid = UID_ROOT;
3036 args.mda_gid = GID_OPERATOR;
3037 args.mda_mode = 0640;
3038 args.mda_si_drv2 = zv;
3039 if (make_dev_s(&args, &zv->zv_dev,
3040 "%s/%s", ZVOL_DRIVER, newname) == 0)
3041 zv->zv_dev->si_iosize_max = MAXPHYS;
3043 strlcpy(zv->zv_name, newname, sizeof(zv->zv_name));
3047 zvol_rename_minors(const char *oldname, const char *newname)
3049 char name[MAXPATHLEN];
3050 struct g_provider *pp;
3052 size_t oldnamelen, newnamelen;
3055 boolean_t locked = B_FALSE;
3057 oldnamelen = strlen(oldname);
3058 newnamelen = strlen(newname);
3061 /* See comment in zvol_open(). */
3062 if (!MUTEX_HELD(&zfsdev_state_lock)) {
3063 mutex_enter(&zfsdev_state_lock);
3067 LIST_FOREACH(zv, &all_zvols, zv_links) {
3068 if (strcmp(zv->zv_name, oldname) == 0) {
3069 zvol_rename_minor(zv, newname);
3070 } else if (strncmp(zv->zv_name, oldname, oldnamelen) == 0 &&
3071 (zv->zv_name[oldnamelen] == '/' ||
3072 zv->zv_name[oldnamelen] == '@')) {
3073 snprintf(name, sizeof(name), "%s%c%s", newname,
3074 zv->zv_name[oldnamelen],
3075 zv->zv_name + oldnamelen + 1);
3076 zvol_rename_minor(zv, name);
3081 mutex_exit(&zfsdev_state_lock);
3086 zvol_d_open(struct cdev *dev, int flags, int fmt, struct thread *td)
3088 zvol_state_t *zv = dev->si_drv2;
3091 mutex_enter(&zfsdev_state_lock);
3092 if (zv->zv_total_opens == 0)
3093 err = zvol_first_open(zv);
3095 mutex_exit(&zfsdev_state_lock);
3098 if ((flags & FWRITE) && (zv->zv_flags & ZVOL_RDONLY)) {
3099 err = SET_ERROR(EROFS);
3102 if (zv->zv_flags & ZVOL_EXCL) {
3103 err = SET_ERROR(EBUSY);
3107 if (flags & FEXCL) {
3108 if (zv->zv_total_opens != 0) {
3109 err = SET_ERROR(EBUSY);
3112 zv->zv_flags |= ZVOL_EXCL;
3116 zv->zv_total_opens++;
3117 if (flags & (FSYNC | FDSYNC)) {
3119 if (zv->zv_sync_cnt == 1)
3120 zil_async_to_sync(zv->zv_zilog, ZVOL_OBJ);
3122 mutex_exit(&zfsdev_state_lock);
3125 if (zv->zv_total_opens == 0)
3126 zvol_last_close(zv);
3127 mutex_exit(&zfsdev_state_lock);
3132 zvol_d_close(struct cdev *dev, int flags, int fmt, struct thread *td)
3134 zvol_state_t *zv = dev->si_drv2;
3136 mutex_enter(&zfsdev_state_lock);
3137 if (zv->zv_flags & ZVOL_EXCL) {
3138 ASSERT(zv->zv_total_opens == 1);
3139 zv->zv_flags &= ~ZVOL_EXCL;
3143 * If the open count is zero, this is a spurious close.
3144 * That indicates a bug in the kernel / DDI framework.
3146 ASSERT(zv->zv_total_opens != 0);
3149 * You may get multiple opens, but only one close.
3151 zv->zv_total_opens--;
3152 if (flags & (FSYNC | FDSYNC))
3155 if (zv->zv_total_opens == 0)
3156 zvol_last_close(zv);
3158 mutex_exit(&zfsdev_state_lock);
3163 zvol_d_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td)
3167 off_t offset, length;
3174 KASSERT(zv->zv_total_opens > 0,
3175 ("Device with zero access count in zvol_d_ioctl"));
3177 i = IOCPARM_LEN(cmd);
3179 case DIOCGSECTORSIZE:
3180 *(u_int *)data = DEV_BSIZE;
3182 case DIOCGMEDIASIZE:
3183 *(off_t *)data = zv->zv_volsize;
3186 zil_commit(zv->zv_zilog, ZVOL_OBJ);
3189 if (!zvol_unmap_enabled)
3192 offset = ((off_t *)data)[0];
3193 length = ((off_t *)data)[1];
3194 if ((offset % DEV_BSIZE) != 0 || (length % DEV_BSIZE) != 0 ||
3195 offset < 0 || offset >= zv->zv_volsize ||
3197 printf("%s: offset=%jd length=%jd\n", __func__, offset,
3203 lr = rangelock_enter(&zv->zv_rangelock, offset, length,
3205 dmu_tx_t *tx = dmu_tx_create(zv->zv_objset);
3206 error = dmu_tx_assign(tx, TXG_WAIT);
3211 sync = (zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS);
3212 zvol_log_truncate(zv, tx, offset, length, sync);
3214 error = dmu_free_long_range(zv->zv_objset, ZVOL_OBJ,
3219 zil_commit(zv->zv_zilog, ZVOL_OBJ);
3221 case DIOCGSTRIPESIZE:
3222 *(off_t *)data = zv->zv_volblocksize;
3224 case DIOCGSTRIPEOFFSET:
3228 spa_t *spa = dmu_objset_spa(zv->zv_objset);
3229 struct diocgattr_arg *arg = (struct diocgattr_arg *)data;
3230 uint64_t refd, avail, usedobjs, availobjs;
3232 if (strcmp(arg->name, "GEOM::candelete") == 0)
3234 else if (strcmp(arg->name, "blocksavail") == 0) {
3235 dmu_objset_space(zv->zv_objset, &refd, &avail,
3236 &usedobjs, &availobjs);
3237 arg->value.off = avail / DEV_BSIZE;
3238 } else if (strcmp(arg->name, "blocksused") == 0) {
3239 dmu_objset_space(zv->zv_objset, &refd, &avail,
3240 &usedobjs, &availobjs);
3241 arg->value.off = refd / DEV_BSIZE;
3242 } else if (strcmp(arg->name, "poolblocksavail") == 0) {
3243 avail = metaslab_class_get_space(spa_normal_class(spa));
3244 avail -= metaslab_class_get_alloc(spa_normal_class(spa));
3245 arg->value.off = avail / DEV_BSIZE;
3246 } else if (strcmp(arg->name, "poolblocksused") == 0) {
3247 refd = metaslab_class_get_alloc(spa_normal_class(spa));
3248 arg->value.off = refd / DEV_BSIZE;
3255 off_t *off = (off_t *)data;
3259 hole = (cmd == FIOSEEKHOLE);
3261 error = dmu_offset_next(zv->zv_objset, ZVOL_OBJ, hole, &noff);
3271 #endif /* illumos */