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 2011 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>
98 #include <geom/geom.h>
100 #include "zfs_namecheck.h"
103 struct g_class zfs_zvol_class = {
105 .version = G_VERSION,
108 DECLARE_GEOM_CLASS(zfs_zvol_class, zfs_zvol);
112 static char *zvol_tag = "zvol_tag";
114 #define ZVOL_DUMPSIZE "dumpsize"
117 * This lock protects the zfsdev_state structure from being modified
118 * while it's being used, e.g. an open that comes in before a create
119 * finishes. It also protects temporary opens of the dataset so that,
120 * e.g., an open doesn't get a spurious EBUSY.
123 kmutex_t zfsdev_state_lock;
126 * In FreeBSD we've replaced the upstream zfsdev_state_lock with the
127 * spa_namespace_lock in the ZVOL code.
129 #define zfsdev_state_lock spa_namespace_lock
131 static uint32_t zvol_minors;
134 SYSCTL_DECL(_vfs_zfs);
135 SYSCTL_NODE(_vfs_zfs, OID_AUTO, vol, CTLFLAG_RW, 0, "ZFS VOLUME");
136 static int volmode = ZFS_VOLMODE_GEOM;
137 SYSCTL_INT(_vfs_zfs_vol, OID_AUTO, mode, CTLFLAG_RWTUN, &volmode, 0,
138 "Expose as GEOM providers (1), device files (2) or neither");
139 static boolean_t zpool_on_zvol = B_FALSE;
140 SYSCTL_INT(_vfs_zfs_vol, OID_AUTO, recursive, CTLFLAG_RWTUN, &zpool_on_zvol, 0,
141 "Allow zpools to use zvols as vdevs (DANGEROUS)");
144 typedef struct zvol_extent {
146 dva_t ze_dva; /* dva associated with this extent */
147 uint64_t ze_nblks; /* number of blocks in extent */
151 * The in-core state of each volume.
153 typedef struct zvol_state {
155 LIST_ENTRY(zvol_state) zv_links;
157 char zv_name[MAXPATHLEN]; /* pool/dd name */
158 uint64_t zv_volsize; /* amount of space we advertise */
159 uint64_t zv_volblocksize; /* volume block size */
161 minor_t zv_minor; /* minor number */
163 struct cdev *zv_dev; /* non-GEOM device */
164 struct g_provider *zv_provider; /* GEOM provider */
166 uint8_t zv_min_bs; /* minimum addressable block shift */
167 uint8_t zv_flags; /* readonly, dumpified, etc. */
168 objset_t *zv_objset; /* objset handle */
170 uint32_t zv_open_count[OTYPCNT]; /* open counts */
172 uint32_t zv_total_opens; /* total open count */
173 uint32_t zv_sync_cnt; /* synchronous open count */
174 zilog_t *zv_zilog; /* ZIL handle */
175 list_t zv_extents; /* List of extents for dump */
176 znode_t zv_znode; /* for range locking */
177 dnode_t *zv_dn; /* dnode hold */
180 int zv_volmode; /* Provide GEOM or cdev */
181 struct bio_queue_head zv_queue;
182 struct mtx zv_queue_mtx; /* zv_queue mutex */
187 static LIST_HEAD(, zvol_state) all_zvols;
190 * zvol specific flags
192 #define ZVOL_RDONLY 0x1
193 #define ZVOL_DUMPIFIED 0x2
194 #define ZVOL_EXCL 0x4
198 * zvol maximum transfer in one DMU tx.
200 int zvol_maxphys = DMU_MAX_ACCESS/2;
203 * Toggle unmap functionality.
205 boolean_t zvol_unmap_enabled = B_TRUE;
208 * If true, unmaps requested as synchronous are executed synchronously,
209 * otherwise all unmaps are asynchronous.
211 boolean_t zvol_unmap_sync_enabled = B_FALSE;
214 SYSCTL_INT(_vfs_zfs_vol, OID_AUTO, unmap_enabled, CTLFLAG_RWTUN,
215 &zvol_unmap_enabled, 0,
216 "Enable UNMAP functionality");
218 SYSCTL_INT(_vfs_zfs_vol, OID_AUTO, unmap_sync_enabled, CTLFLAG_RWTUN,
219 &zvol_unmap_sync_enabled, 0,
220 "UNMAPs requested as sync are executed synchronously");
222 static d_open_t zvol_d_open;
223 static d_close_t zvol_d_close;
224 static d_read_t zvol_read;
225 static d_write_t zvol_write;
226 static d_ioctl_t zvol_d_ioctl;
227 static d_strategy_t zvol_strategy;
229 static struct cdevsw zvol_cdevsw = {
230 .d_version = D_VERSION,
231 .d_open = zvol_d_open,
232 .d_close = zvol_d_close,
234 .d_write = zvol_write,
235 .d_ioctl = zvol_d_ioctl,
236 .d_strategy = zvol_strategy,
238 .d_flags = D_DISK | D_TRACKCLOSE,
241 static void zvol_geom_run(zvol_state_t *zv);
242 static void zvol_geom_destroy(zvol_state_t *zv);
243 static int zvol_geom_access(struct g_provider *pp, int acr, int acw, int ace);
244 static void zvol_geom_start(struct bio *bp);
245 static void zvol_geom_worker(void *arg);
246 static void zvol_log_truncate(zvol_state_t *zv, dmu_tx_t *tx, uint64_t off,
247 uint64_t len, boolean_t sync);
248 #endif /* !illumos */
250 extern int zfs_set_prop_nvlist(const char *, zprop_source_t,
251 nvlist_t *, nvlist_t *);
252 static int zvol_remove_zv(zvol_state_t *);
253 static int zvol_get_data(void *arg, lr_write_t *lr, char *buf,
254 struct lwb *lwb, zio_t *zio);
255 static int zvol_dumpify(zvol_state_t *zv);
256 static int zvol_dump_fini(zvol_state_t *zv);
257 static int zvol_dump_init(zvol_state_t *zv, boolean_t resize);
260 zvol_size_changed(zvol_state_t *zv, uint64_t volsize)
263 dev_t dev = makedevice(ddi_driver_major(zfs_dip), zv->zv_minor);
265 zv->zv_volsize = volsize;
266 VERIFY(ddi_prop_update_int64(dev, zfs_dip,
267 "Size", volsize) == DDI_SUCCESS);
268 VERIFY(ddi_prop_update_int64(dev, zfs_dip,
269 "Nblocks", lbtodb(volsize)) == DDI_SUCCESS);
271 /* Notify specfs to invalidate the cached size */
272 spec_size_invalidate(dev, VBLK);
273 spec_size_invalidate(dev, VCHR);
275 zv->zv_volsize = volsize;
276 if (zv->zv_volmode == ZFS_VOLMODE_GEOM) {
277 struct g_provider *pp;
279 pp = zv->zv_provider;
285 * Do not invoke resize event when initial size was zero.
286 * ZVOL initializes the size on first open, this is not
289 if (pp->mediasize == 0)
290 pp->mediasize = zv->zv_volsize;
292 g_resize_provider(pp, zv->zv_volsize);
299 zvol_check_volsize(uint64_t volsize, uint64_t blocksize)
302 return (SET_ERROR(EINVAL));
304 if (volsize % blocksize != 0)
305 return (SET_ERROR(EINVAL));
308 if (volsize - 1 > SPEC_MAXOFFSET_T)
309 return (SET_ERROR(EOVERFLOW));
315 zvol_check_volblocksize(uint64_t volblocksize)
317 if (volblocksize < SPA_MINBLOCKSIZE ||
318 volblocksize > SPA_OLD_MAXBLOCKSIZE ||
320 return (SET_ERROR(EDOM));
326 zvol_get_stats(objset_t *os, nvlist_t *nv)
329 dmu_object_info_t doi;
332 error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &val);
336 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLSIZE, val);
338 error = dmu_object_info(os, ZVOL_OBJ, &doi);
341 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLBLOCKSIZE,
342 doi.doi_data_block_size);
348 static zvol_state_t *
349 zvol_minor_lookup(const char *name)
356 ASSERT(MUTEX_HELD(&zfsdev_state_lock));
359 for (minor = 1; minor <= ZFSDEV_MAX_MINOR; minor++) {
360 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL);
364 LIST_FOREACH(zv, &all_zvols, zv_links) {
366 if (strcmp(zv->zv_name, name) == 0)
373 /* extent mapping arg */
381 zvol_map_block(spa_t *spa, zilog_t *zilog, const blkptr_t *bp,
382 const zbookmark_phys_t *zb, const dnode_phys_t *dnp, void *arg)
384 struct maparg *ma = arg;
386 int bs = ma->ma_zv->zv_volblocksize;
388 if (bp == NULL || BP_IS_HOLE(bp) ||
389 zb->zb_object != ZVOL_OBJ || zb->zb_level != 0)
392 VERIFY(!BP_IS_EMBEDDED(bp));
394 VERIFY3U(ma->ma_blks, ==, zb->zb_blkid);
397 /* Abort immediately if we have encountered gang blocks */
399 return (SET_ERROR(EFRAGS));
402 * See if the block is at the end of the previous extent.
404 ze = list_tail(&ma->ma_zv->zv_extents);
406 DVA_GET_VDEV(BP_IDENTITY(bp)) == DVA_GET_VDEV(&ze->ze_dva) &&
407 DVA_GET_OFFSET(BP_IDENTITY(bp)) ==
408 DVA_GET_OFFSET(&ze->ze_dva) + ze->ze_nblks * bs) {
413 dprintf_bp(bp, "%s", "next blkptr:");
415 /* start a new extent */
416 ze = kmem_zalloc(sizeof (zvol_extent_t), KM_SLEEP);
417 ze->ze_dva = bp->blk_dva[0]; /* structure assignment */
419 list_insert_tail(&ma->ma_zv->zv_extents, ze);
424 zvol_free_extents(zvol_state_t *zv)
428 while (ze = list_head(&zv->zv_extents)) {
429 list_remove(&zv->zv_extents, ze);
430 kmem_free(ze, sizeof (zvol_extent_t));
435 zvol_get_lbas(zvol_state_t *zv)
437 objset_t *os = zv->zv_objset;
443 zvol_free_extents(zv);
445 /* commit any in-flight changes before traversing the dataset */
446 txg_wait_synced(dmu_objset_pool(os), 0);
447 err = traverse_dataset(dmu_objset_ds(os), 0,
448 TRAVERSE_PRE | TRAVERSE_PREFETCH_METADATA, zvol_map_block, &ma);
449 if (err || ma.ma_blks != (zv->zv_volsize / zv->zv_volblocksize)) {
450 zvol_free_extents(zv);
451 return (err ? err : EIO);
459 zvol_create_cb(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx)
461 zfs_creat_t *zct = arg;
462 nvlist_t *nvprops = zct->zct_props;
464 uint64_t volblocksize, volsize;
466 VERIFY(nvlist_lookup_uint64(nvprops,
467 zfs_prop_to_name(ZFS_PROP_VOLSIZE), &volsize) == 0);
468 if (nvlist_lookup_uint64(nvprops,
469 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &volblocksize) != 0)
470 volblocksize = zfs_prop_default_numeric(ZFS_PROP_VOLBLOCKSIZE);
473 * These properties must be removed from the list so the generic
474 * property setting step won't apply to them.
476 VERIFY(nvlist_remove_all(nvprops,
477 zfs_prop_to_name(ZFS_PROP_VOLSIZE)) == 0);
478 (void) nvlist_remove_all(nvprops,
479 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE));
481 error = dmu_object_claim(os, ZVOL_OBJ, DMU_OT_ZVOL, volblocksize,
485 error = zap_create_claim(os, ZVOL_ZAP_OBJ, DMU_OT_ZVOL_PROP,
489 error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize, tx);
494 * Replay a TX_TRUNCATE ZIL transaction if asked. TX_TRUNCATE is how we
495 * implement DKIOCFREE/free-long-range.
498 zvol_replay_truncate(void *arg1, void *arg2, boolean_t byteswap)
500 zvol_state_t *zv = arg1;
501 lr_truncate_t *lr = arg2;
502 uint64_t offset, length;
505 byteswap_uint64_array(lr, sizeof (*lr));
507 offset = lr->lr_offset;
508 length = lr->lr_length;
510 return (dmu_free_long_range(zv->zv_objset, ZVOL_OBJ, offset, length));
514 * Replay a TX_WRITE ZIL transaction that didn't get committed
515 * after a system failure
518 zvol_replay_write(void *arg1, void *arg2, boolean_t byteswap)
520 zvol_state_t *zv = arg1;
521 lr_write_t *lr = arg2;
522 objset_t *os = zv->zv_objset;
523 char *data = (char *)(lr + 1); /* data follows lr_write_t */
524 uint64_t offset, length;
529 byteswap_uint64_array(lr, sizeof (*lr));
531 offset = lr->lr_offset;
532 length = lr->lr_length;
534 /* If it's a dmu_sync() block, write the whole block */
535 if (lr->lr_common.lrc_reclen == sizeof (lr_write_t)) {
536 uint64_t blocksize = BP_GET_LSIZE(&lr->lr_blkptr);
537 if (length < blocksize) {
538 offset -= offset % blocksize;
543 tx = dmu_tx_create(os);
544 dmu_tx_hold_write(tx, ZVOL_OBJ, offset, length);
545 error = dmu_tx_assign(tx, TXG_WAIT);
549 dmu_write(os, ZVOL_OBJ, offset, length, data, tx);
558 zvol_replay_err(void *arg1, void *arg2, boolean_t byteswap)
560 return (SET_ERROR(ENOTSUP));
564 * Callback vectors for replaying records.
565 * Only TX_WRITE and TX_TRUNCATE are needed for zvol.
567 zil_replay_func_t *zvol_replay_vector[TX_MAX_TYPE] = {
568 zvol_replay_err, /* 0 no such transaction type */
569 zvol_replay_err, /* TX_CREATE */
570 zvol_replay_err, /* TX_MKDIR */
571 zvol_replay_err, /* TX_MKXATTR */
572 zvol_replay_err, /* TX_SYMLINK */
573 zvol_replay_err, /* TX_REMOVE */
574 zvol_replay_err, /* TX_RMDIR */
575 zvol_replay_err, /* TX_LINK */
576 zvol_replay_err, /* TX_RENAME */
577 zvol_replay_write, /* TX_WRITE */
578 zvol_replay_truncate, /* TX_TRUNCATE */
579 zvol_replay_err, /* TX_SETATTR */
580 zvol_replay_err, /* TX_ACL */
581 zvol_replay_err, /* TX_CREATE_ACL */
582 zvol_replay_err, /* TX_CREATE_ATTR */
583 zvol_replay_err, /* TX_CREATE_ACL_ATTR */
584 zvol_replay_err, /* TX_MKDIR_ACL */
585 zvol_replay_err, /* TX_MKDIR_ATTR */
586 zvol_replay_err, /* TX_MKDIR_ACL_ATTR */
587 zvol_replay_err, /* TX_WRITE2 */
592 zvol_name2minor(const char *name, minor_t *minor)
596 mutex_enter(&zfsdev_state_lock);
597 zv = zvol_minor_lookup(name);
599 *minor = zv->zv_minor;
600 mutex_exit(&zfsdev_state_lock);
601 return (zv ? 0 : -1);
606 * Create a minor node (plus a whole lot more) for the specified volume.
609 zvol_create_minor(const char *name)
611 zfs_soft_state_t *zs;
615 dmu_object_info_t doi;
617 char chrbuf[30], blkbuf[30];
619 struct g_provider *pp;
626 ZFS_LOG(1, "Creating ZVOL %s...", name);
629 mutex_enter(&zfsdev_state_lock);
631 if (zvol_minor_lookup(name) != NULL) {
632 mutex_exit(&zfsdev_state_lock);
633 return (SET_ERROR(EEXIST));
636 /* lie and say we're read-only */
637 error = dmu_objset_own(name, DMU_OST_ZVOL, B_TRUE, FTAG, &os);
640 mutex_exit(&zfsdev_state_lock);
645 if ((minor = zfsdev_minor_alloc()) == 0) {
646 dmu_objset_disown(os, FTAG);
647 mutex_exit(&zfsdev_state_lock);
648 return (SET_ERROR(ENXIO));
651 if (ddi_soft_state_zalloc(zfsdev_state, minor) != DDI_SUCCESS) {
652 dmu_objset_disown(os, FTAG);
653 mutex_exit(&zfsdev_state_lock);
654 return (SET_ERROR(EAGAIN));
656 (void) ddi_prop_update_string(minor, zfs_dip, ZVOL_PROP_NAME,
659 (void) snprintf(chrbuf, sizeof (chrbuf), "%u,raw", minor);
661 if (ddi_create_minor_node(zfs_dip, chrbuf, S_IFCHR,
662 minor, DDI_PSEUDO, 0) == DDI_FAILURE) {
663 ddi_soft_state_free(zfsdev_state, minor);
664 dmu_objset_disown(os, FTAG);
665 mutex_exit(&zfsdev_state_lock);
666 return (SET_ERROR(EAGAIN));
669 (void) snprintf(blkbuf, sizeof (blkbuf), "%u", minor);
671 if (ddi_create_minor_node(zfs_dip, blkbuf, S_IFBLK,
672 minor, DDI_PSEUDO, 0) == DDI_FAILURE) {
673 ddi_remove_minor_node(zfs_dip, chrbuf);
674 ddi_soft_state_free(zfsdev_state, minor);
675 dmu_objset_disown(os, FTAG);
676 mutex_exit(&zfsdev_state_lock);
677 return (SET_ERROR(EAGAIN));
680 zs = ddi_get_soft_state(zfsdev_state, minor);
681 zs->zss_type = ZSST_ZVOL;
682 zv = zs->zss_data = kmem_zalloc(sizeof (zvol_state_t), KM_SLEEP);
685 zv = kmem_zalloc(sizeof(*zv), KM_SLEEP);
687 error = dsl_prop_get_integer(name,
688 zfs_prop_to_name(ZFS_PROP_VOLMODE), &mode, NULL);
689 if (error != 0 || mode == ZFS_VOLMODE_DEFAULT)
693 zv->zv_volmode = mode;
694 if (zv->zv_volmode == ZFS_VOLMODE_GEOM) {
696 gp = g_new_geomf(&zfs_zvol_class, "zfs::zvol::%s", name);
697 gp->start = zvol_geom_start;
698 gp->access = zvol_geom_access;
699 pp = g_new_providerf(gp, "%s/%s", ZVOL_DRIVER, name);
700 pp->flags |= G_PF_DIRECT_RECEIVE | G_PF_DIRECT_SEND;
701 pp->sectorsize = DEV_BSIZE;
705 zv->zv_provider = pp;
706 bioq_init(&zv->zv_queue);
707 mtx_init(&zv->zv_queue_mtx, "zvol", NULL, MTX_DEF);
708 } else if (zv->zv_volmode == ZFS_VOLMODE_DEV) {
709 struct make_dev_args args;
711 make_dev_args_init(&args);
712 args.mda_flags = MAKEDEV_CHECKNAME | MAKEDEV_WAITOK;
713 args.mda_devsw = &zvol_cdevsw;
715 args.mda_uid = UID_ROOT;
716 args.mda_gid = GID_OPERATOR;
717 args.mda_mode = 0640;
718 args.mda_si_drv2 = zv;
719 error = make_dev_s(&args, &zv->zv_dev,
720 "%s/%s", ZVOL_DRIVER, name);
722 kmem_free(zv, sizeof(*zv));
723 dmu_objset_disown(os, FTAG);
724 mutex_exit(&zfsdev_state_lock);
727 zv->zv_dev->si_iosize_max = MAXPHYS;
729 LIST_INSERT_HEAD(&all_zvols, zv, zv_links);
732 (void) strlcpy(zv->zv_name, name, MAXPATHLEN);
733 zv->zv_min_bs = DEV_BSHIFT;
735 zv->zv_minor = minor;
738 if (dmu_objset_is_snapshot(os) || !spa_writeable(dmu_objset_spa(os)))
739 zv->zv_flags |= ZVOL_RDONLY;
740 mutex_init(&zv->zv_znode.z_range_lock, NULL, MUTEX_DEFAULT, NULL);
741 avl_create(&zv->zv_znode.z_range_avl, zfs_range_compare,
742 sizeof (rl_t), offsetof(rl_t, r_node));
743 list_create(&zv->zv_extents, sizeof (zvol_extent_t),
744 offsetof(zvol_extent_t, ze_node));
746 /* get and cache the blocksize */
747 error = dmu_object_info(os, ZVOL_OBJ, &doi);
749 zv->zv_volblocksize = doi.doi_data_block_size;
752 if (spa_writeable(dmu_objset_spa(os))) {
753 if (zil_replay_disable)
754 zil_destroy(dmu_objset_zil(os), B_FALSE);
756 zil_replay(os, zv, zvol_replay_vector);
758 dmu_objset_disown(os, FTAG);
759 zv->zv_objset = NULL;
763 mutex_exit(&zfsdev_state_lock);
765 if (zv->zv_volmode == ZFS_VOLMODE_GEOM) {
771 ZFS_LOG(1, "ZVOL %s created.", name);
778 * Remove minor node for the specified volume.
781 zvol_remove_zv(zvol_state_t *zv)
785 minor_t minor = zv->zv_minor;
788 ASSERT(MUTEX_HELD(&zfsdev_state_lock));
789 if (zv->zv_total_opens != 0)
790 return (SET_ERROR(EBUSY));
793 (void) snprintf(nmbuf, sizeof (nmbuf), "%u,raw", minor);
794 ddi_remove_minor_node(zfs_dip, nmbuf);
796 (void) snprintf(nmbuf, sizeof (nmbuf), "%u", minor);
797 ddi_remove_minor_node(zfs_dip, nmbuf);
799 ZFS_LOG(1, "ZVOL %s destroyed.", zv->zv_name);
801 LIST_REMOVE(zv, zv_links);
802 if (zv->zv_volmode == ZFS_VOLMODE_GEOM) {
804 zvol_geom_destroy(zv);
806 } else if (zv->zv_volmode == ZFS_VOLMODE_DEV) {
807 if (zv->zv_dev != NULL)
808 destroy_dev(zv->zv_dev);
812 avl_destroy(&zv->zv_znode.z_range_avl);
813 mutex_destroy(&zv->zv_znode.z_range_lock);
815 kmem_free(zv, sizeof (zvol_state_t));
817 ddi_soft_state_free(zfsdev_state, minor);
824 zvol_remove_minor(const char *name)
829 mutex_enter(&zfsdev_state_lock);
830 if ((zv = zvol_minor_lookup(name)) == NULL) {
831 mutex_exit(&zfsdev_state_lock);
832 return (SET_ERROR(ENXIO));
834 rc = zvol_remove_zv(zv);
835 mutex_exit(&zfsdev_state_lock);
840 zvol_first_open(zvol_state_t *zv)
842 dmu_object_info_t doi;
848 /* lie and say we're read-only */
849 error = dmu_objset_own(zv->zv_name, DMU_OST_ZVOL, B_TRUE,
855 error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize);
858 dmu_objset_disown(os, zvol_tag);
862 /* get and cache the blocksize */
863 error = dmu_object_info(os, ZVOL_OBJ, &doi);
866 dmu_objset_disown(os, zvol_tag);
869 zv->zv_volblocksize = doi.doi_data_block_size;
871 error = dnode_hold(os, ZVOL_OBJ, zvol_tag, &zv->zv_dn);
873 dmu_objset_disown(os, zvol_tag);
877 zvol_size_changed(zv, volsize);
878 zv->zv_zilog = zil_open(os, zvol_get_data);
880 VERIFY(dsl_prop_get_integer(zv->zv_name, "readonly", &readonly,
882 if (readonly || dmu_objset_is_snapshot(os) ||
883 !spa_writeable(dmu_objset_spa(os)))
884 zv->zv_flags |= ZVOL_RDONLY;
886 zv->zv_flags &= ~ZVOL_RDONLY;
891 zvol_last_close(zvol_state_t *zv)
893 zil_close(zv->zv_zilog);
896 dnode_rele(zv->zv_dn, zvol_tag);
902 if (dsl_dataset_is_dirty(dmu_objset_ds(zv->zv_objset)) &&
903 !(zv->zv_flags & ZVOL_RDONLY))
904 txg_wait_synced(dmu_objset_pool(zv->zv_objset), 0);
905 dmu_objset_evict_dbufs(zv->zv_objset);
907 dmu_objset_disown(zv->zv_objset, zvol_tag);
908 zv->zv_objset = NULL;
913 zvol_prealloc(zvol_state_t *zv)
915 objset_t *os = zv->zv_objset;
917 uint64_t refd, avail, usedobjs, availobjs;
918 uint64_t resid = zv->zv_volsize;
921 /* Check the space usage before attempting to allocate the space */
922 dmu_objset_space(os, &refd, &avail, &usedobjs, &availobjs);
923 if (avail < zv->zv_volsize)
924 return (SET_ERROR(ENOSPC));
926 /* Free old extents if they exist */
927 zvol_free_extents(zv);
931 uint64_t bytes = MIN(resid, SPA_OLD_MAXBLOCKSIZE);
933 tx = dmu_tx_create(os);
934 dmu_tx_hold_write(tx, ZVOL_OBJ, off, bytes);
935 error = dmu_tx_assign(tx, TXG_WAIT);
938 (void) dmu_free_long_range(os, ZVOL_OBJ, 0, off);
941 dmu_prealloc(os, ZVOL_OBJ, off, bytes, tx);
946 txg_wait_synced(dmu_objset_pool(os), 0);
953 zvol_update_volsize(objset_t *os, uint64_t volsize)
958 ASSERT(MUTEX_HELD(&zfsdev_state_lock));
960 tx = dmu_tx_create(os);
961 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL);
962 dmu_tx_mark_netfree(tx);
963 error = dmu_tx_assign(tx, TXG_WAIT);
969 error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1,
974 error = dmu_free_long_range(os,
975 ZVOL_OBJ, volsize, DMU_OBJECT_END);
980 zvol_remove_minors(const char *name)
987 namebuf = kmem_zalloc(strlen(name) + 2, KM_SLEEP);
988 (void) strncpy(namebuf, name, strlen(name));
989 (void) strcat(namebuf, "/");
990 mutex_enter(&zfsdev_state_lock);
991 for (minor = 1; minor <= ZFSDEV_MAX_MINOR; minor++) {
993 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL);
996 if (strncmp(namebuf, zv->zv_name, strlen(namebuf)) == 0)
997 (void) zvol_remove_zv(zv);
999 kmem_free(namebuf, strlen(name) + 2);
1001 mutex_exit(&zfsdev_state_lock);
1002 #else /* !illumos */
1003 zvol_state_t *zv, *tzv;
1006 namelen = strlen(name);
1009 mutex_enter(&zfsdev_state_lock);
1011 LIST_FOREACH_SAFE(zv, &all_zvols, zv_links, tzv) {
1012 if (strcmp(zv->zv_name, name) == 0 ||
1013 (strncmp(zv->zv_name, name, namelen) == 0 &&
1014 strlen(zv->zv_name) > namelen && (zv->zv_name[namelen] == '/' ||
1015 zv->zv_name[namelen] == '@'))) {
1016 (void) zvol_remove_zv(zv);
1020 mutex_exit(&zfsdev_state_lock);
1022 #endif /* illumos */
1026 zvol_update_live_volsize(zvol_state_t *zv, uint64_t volsize)
1028 uint64_t old_volsize = 0ULL;
1031 ASSERT(MUTEX_HELD(&zfsdev_state_lock));
1034 * Reinitialize the dump area to the new size. If we
1035 * failed to resize the dump area then restore it back to
1036 * its original size. We must set the new volsize prior
1037 * to calling dumpvp_resize() to ensure that the devices'
1038 * size(9P) is not visible by the dump subsystem.
1040 old_volsize = zv->zv_volsize;
1041 zvol_size_changed(zv, volsize);
1044 if (zv->zv_flags & ZVOL_DUMPIFIED) {
1045 if ((error = zvol_dumpify(zv)) != 0 ||
1046 (error = dumpvp_resize()) != 0) {
1049 (void) zvol_update_volsize(zv->zv_objset, old_volsize);
1050 zvol_size_changed(zv, old_volsize);
1051 dumpify_error = zvol_dumpify(zv);
1052 error = dumpify_error ? dumpify_error : error;
1055 #endif /* ZVOL_DUMP */
1059 * Generate a LUN expansion event.
1064 char *physpath = kmem_zalloc(MAXPATHLEN, KM_SLEEP);
1066 (void) snprintf(physpath, MAXPATHLEN, "%s%u", ZVOL_PSEUDO_DEV,
1069 VERIFY(nvlist_alloc(&attr, NV_UNIQUE_NAME, KM_SLEEP) == 0);
1070 VERIFY(nvlist_add_string(attr, DEV_PHYS_PATH, physpath) == 0);
1072 (void) ddi_log_sysevent(zfs_dip, SUNW_VENDOR, EC_DEV_STATUS,
1073 ESC_DEV_DLE, attr, &eid, DDI_SLEEP);
1076 kmem_free(physpath, MAXPATHLEN);
1078 #endif /* illumos */
1083 zvol_set_volsize(const char *name, uint64_t volsize)
1085 zvol_state_t *zv = NULL;
1088 dmu_object_info_t doi;
1090 boolean_t owned = B_FALSE;
1092 error = dsl_prop_get_integer(name,
1093 zfs_prop_to_name(ZFS_PROP_READONLY), &readonly, NULL);
1097 return (SET_ERROR(EROFS));
1099 mutex_enter(&zfsdev_state_lock);
1100 zv = zvol_minor_lookup(name);
1102 if (zv == NULL || zv->zv_objset == NULL) {
1103 if ((error = dmu_objset_own(name, DMU_OST_ZVOL, B_FALSE,
1105 mutex_exit(&zfsdev_state_lock);
1115 if ((error = dmu_object_info(os, ZVOL_OBJ, &doi)) != 0 ||
1116 (error = zvol_check_volsize(volsize, doi.doi_data_block_size)) != 0)
1119 error = zvol_update_volsize(os, volsize);
1121 if (error == 0 && zv != NULL)
1122 error = zvol_update_live_volsize(zv, volsize);
1125 dmu_objset_disown(os, FTAG);
1127 zv->zv_objset = NULL;
1129 mutex_exit(&zfsdev_state_lock);
1136 zvol_open(dev_t *devp, int flag, int otyp, cred_t *cr)
1139 zvol_open(struct g_provider *pp, int flag, int count)
1146 mutex_enter(&zfsdev_state_lock);
1148 zv = zfsdev_get_soft_state(getminor(*devp), ZSST_ZVOL);
1150 mutex_exit(&zfsdev_state_lock);
1151 return (SET_ERROR(ENXIO));
1154 if (zv->zv_total_opens == 0)
1155 err = zvol_first_open(zv);
1157 mutex_exit(&zfsdev_state_lock);
1160 #else /* !illumos */
1161 boolean_t locked = B_FALSE;
1163 if (!zpool_on_zvol && tsd_get(zfs_geom_probe_vdev_key) != NULL) {
1165 * if zfs_geom_probe_vdev_key is set, that means that zfs is
1166 * attempting to probe geom providers while looking for a
1167 * replacement for a missing VDEV. In this case, the
1168 * spa_namespace_lock will not be held, but it is still illegal
1169 * to use a zvol as a vdev. Deadlocks can result if another
1170 * thread has spa_namespace_lock
1172 return (EOPNOTSUPP);
1175 * Protect against recursively entering spa_namespace_lock
1176 * when spa_open() is used for a pool on a (local) ZVOL(s).
1177 * This is needed since we replaced upstream zfsdev_state_lock
1178 * with spa_namespace_lock in the ZVOL code.
1179 * We are using the same trick as spa_open().
1180 * Note that calls in zvol_first_open which need to resolve
1181 * pool name to a spa object will enter spa_open()
1182 * recursively, but that function already has all the
1183 * necessary protection.
1185 if (!MUTEX_HELD(&zfsdev_state_lock)) {
1186 mutex_enter(&zfsdev_state_lock);
1193 mutex_exit(&zfsdev_state_lock);
1194 return (SET_ERROR(ENXIO));
1197 if (zv->zv_total_opens == 0) {
1198 err = zvol_first_open(zv);
1201 mutex_exit(&zfsdev_state_lock);
1204 pp->mediasize = zv->zv_volsize;
1205 pp->stripeoffset = 0;
1206 pp->stripesize = zv->zv_volblocksize;
1208 #endif /* illumos */
1209 if ((flag & FWRITE) && (zv->zv_flags & ZVOL_RDONLY)) {
1210 err = SET_ERROR(EROFS);
1213 if (zv->zv_flags & ZVOL_EXCL) {
1214 err = SET_ERROR(EBUSY);
1219 if (zv->zv_total_opens != 0) {
1220 err = SET_ERROR(EBUSY);
1223 zv->zv_flags |= ZVOL_EXCL;
1228 if (zv->zv_open_count[otyp] == 0 || otyp == OTYP_LYR) {
1229 zv->zv_open_count[otyp]++;
1230 zv->zv_total_opens++;
1232 mutex_exit(&zfsdev_state_lock);
1234 zv->zv_total_opens += count;
1236 mutex_exit(&zfsdev_state_lock);
1241 if (zv->zv_total_opens == 0)
1242 zvol_last_close(zv);
1244 mutex_exit(&zfsdev_state_lock);
1247 mutex_exit(&zfsdev_state_lock);
1255 zvol_close(dev_t dev, int flag, int otyp, cred_t *cr)
1257 minor_t minor = getminor(dev);
1261 mutex_enter(&zfsdev_state_lock);
1263 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL);
1265 mutex_exit(&zfsdev_state_lock);
1266 #else /* !illumos */
1268 zvol_close(struct g_provider *pp, int flag, int count)
1272 boolean_t locked = B_FALSE;
1274 /* See comment in zvol_open(). */
1275 if (!MUTEX_HELD(&zfsdev_state_lock)) {
1276 mutex_enter(&zfsdev_state_lock);
1283 mutex_exit(&zfsdev_state_lock);
1284 #endif /* illumos */
1285 return (SET_ERROR(ENXIO));
1288 if (zv->zv_flags & ZVOL_EXCL) {
1289 ASSERT(zv->zv_total_opens == 1);
1290 zv->zv_flags &= ~ZVOL_EXCL;
1294 * If the open count is zero, this is a spurious close.
1295 * That indicates a bug in the kernel / DDI framework.
1298 ASSERT(zv->zv_open_count[otyp] != 0);
1300 ASSERT(zv->zv_total_opens != 0);
1303 * You may get multiple opens, but only one close.
1306 zv->zv_open_count[otyp]--;
1307 zv->zv_total_opens--;
1309 zv->zv_total_opens -= count;
1312 if (zv->zv_total_opens == 0)
1313 zvol_last_close(zv);
1316 mutex_exit(&zfsdev_state_lock);
1319 mutex_exit(&zfsdev_state_lock);
1325 zvol_get_done(zgd_t *zgd, int error)
1328 dmu_buf_rele(zgd->zgd_db, zgd);
1330 zfs_range_unlock(zgd->zgd_rl);
1332 if (error == 0 && zgd->zgd_bp)
1333 zil_lwb_add_block(zgd->zgd_lwb, zgd->zgd_bp);
1335 kmem_free(zgd, sizeof (zgd_t));
1339 * Get data to generate a TX_WRITE intent log record.
1342 zvol_get_data(void *arg, lr_write_t *lr, char *buf, struct lwb *lwb, zio_t *zio)
1344 zvol_state_t *zv = arg;
1345 uint64_t offset = lr->lr_offset;
1346 uint64_t size = lr->lr_length; /* length of user data */
1351 ASSERT3P(lwb, !=, NULL);
1352 ASSERT3P(zio, !=, NULL);
1353 ASSERT3U(size, !=, 0);
1355 zgd = kmem_zalloc(sizeof (zgd_t), KM_SLEEP);
1359 * Write records come in two flavors: immediate and indirect.
1360 * For small writes it's cheaper to store the data with the
1361 * log record (immediate); for large writes it's cheaper to
1362 * sync the data and get a pointer to it (indirect) so that
1363 * we don't have to write the data twice.
1365 if (buf != NULL) { /* immediate write */
1366 zgd->zgd_rl = zfs_range_lock(&zv->zv_znode, offset, size,
1368 error = dmu_read_by_dnode(zv->zv_dn, offset, size, buf,
1369 DMU_READ_NO_PREFETCH);
1370 } else { /* indirect write */
1372 * Have to lock the whole block to ensure when it's written out
1373 * and its checksum is being calculated that no one can change
1374 * the data. Contrarily to zfs_get_data we need not re-check
1375 * blocksize after we get the lock because it cannot be changed.
1377 size = zv->zv_volblocksize;
1378 offset = P2ALIGN(offset, size);
1379 zgd->zgd_rl = zfs_range_lock(&zv->zv_znode, offset, size,
1381 error = dmu_buf_hold_by_dnode(zv->zv_dn, offset, zgd, &db,
1382 DMU_READ_NO_PREFETCH);
1384 blkptr_t *bp = &lr->lr_blkptr;
1389 ASSERT(db->db_offset == offset);
1390 ASSERT(db->db_size == size);
1392 error = dmu_sync(zio, lr->lr_common.lrc_txg,
1393 zvol_get_done, zgd);
1400 zvol_get_done(zgd, error);
1406 * zvol_log_write() handles synchronous writes using TX_WRITE ZIL transactions.
1408 * We store data in the log buffers if it's small enough.
1409 * Otherwise we will later flush the data out via dmu_sync().
1411 ssize_t zvol_immediate_write_sz = 32768;
1413 SYSCTL_LONG(_vfs_zfs_vol, OID_AUTO, immediate_write_sz, CTLFLAG_RWTUN,
1414 &zvol_immediate_write_sz, 0, "Minimal size for indirect log write");
1418 zvol_log_write(zvol_state_t *zv, dmu_tx_t *tx, offset_t off, ssize_t resid,
1421 uint32_t blocksize = zv->zv_volblocksize;
1422 zilog_t *zilog = zv->zv_zilog;
1423 itx_wr_state_t write_state;
1425 if (zil_replaying(zilog, tx))
1428 if (zilog->zl_logbias == ZFS_LOGBIAS_THROUGHPUT)
1429 write_state = WR_INDIRECT;
1430 else if (!spa_has_slogs(zilog->zl_spa) &&
1431 resid >= blocksize && blocksize > zvol_immediate_write_sz)
1432 write_state = WR_INDIRECT;
1434 write_state = WR_COPIED;
1436 write_state = WR_NEED_COPY;
1441 itx_wr_state_t wr_state = write_state;
1442 ssize_t len = resid;
1444 if (wr_state == WR_COPIED && resid > ZIL_MAX_COPIED_DATA)
1445 wr_state = WR_NEED_COPY;
1446 else if (wr_state == WR_INDIRECT)
1447 len = MIN(blocksize - P2PHASE(off, blocksize), resid);
1449 itx = zil_itx_create(TX_WRITE, sizeof (*lr) +
1450 (wr_state == WR_COPIED ? len : 0));
1451 lr = (lr_write_t *)&itx->itx_lr;
1452 if (wr_state == WR_COPIED && dmu_read_by_dnode(zv->zv_dn,
1453 off, len, lr + 1, DMU_READ_NO_PREFETCH) != 0) {
1454 zil_itx_destroy(itx);
1455 itx = zil_itx_create(TX_WRITE, sizeof (*lr));
1456 lr = (lr_write_t *)&itx->itx_lr;
1457 wr_state = WR_NEED_COPY;
1460 itx->itx_wr_state = wr_state;
1461 lr->lr_foid = ZVOL_OBJ;
1462 lr->lr_offset = off;
1463 lr->lr_length = len;
1465 BP_ZERO(&lr->lr_blkptr);
1467 itx->itx_private = zv;
1469 if (!sync && (zv->zv_sync_cnt == 0))
1470 itx->itx_sync = B_FALSE;
1472 zil_itx_assign(zilog, itx, tx);
1481 zvol_dumpio_vdev(vdev_t *vd, void *addr, uint64_t offset, uint64_t origoffset,
1482 uint64_t size, boolean_t doread, boolean_t isdump)
1488 if (vd->vdev_ops == &vdev_mirror_ops ||
1489 vd->vdev_ops == &vdev_replacing_ops ||
1490 vd->vdev_ops == &vdev_spare_ops) {
1491 for (c = 0; c < vd->vdev_children; c++) {
1492 int err = zvol_dumpio_vdev(vd->vdev_child[c],
1493 addr, offset, origoffset, size, doread, isdump);
1496 } else if (doread) {
1502 if (!vd->vdev_ops->vdev_op_leaf && vd->vdev_ops != &vdev_raidz_ops)
1503 return (numerrors < vd->vdev_children ? 0 : EIO);
1505 if (doread && !vdev_readable(vd))
1506 return (SET_ERROR(EIO));
1507 else if (!doread && !vdev_writeable(vd))
1508 return (SET_ERROR(EIO));
1510 if (vd->vdev_ops == &vdev_raidz_ops) {
1511 return (vdev_raidz_physio(vd,
1512 addr, size, offset, origoffset, doread, isdump));
1515 offset += VDEV_LABEL_START_SIZE;
1517 if (ddi_in_panic() || isdump) {
1520 return (SET_ERROR(EIO));
1522 ASSERT3P(dvd, !=, NULL);
1523 return (ldi_dump(dvd->vd_lh, addr, lbtodb(offset),
1527 ASSERT3P(dvd, !=, NULL);
1528 return (vdev_disk_ldi_physio(dvd->vd_lh, addr, size,
1529 offset, doread ? B_READ : B_WRITE));
1534 zvol_dumpio(zvol_state_t *zv, void *addr, uint64_t offset, uint64_t size,
1535 boolean_t doread, boolean_t isdump)
1540 spa_t *spa = dmu_objset_spa(zv->zv_objset);
1542 /* Must be sector aligned, and not stradle a block boundary. */
1543 if (P2PHASE(offset, DEV_BSIZE) || P2PHASE(size, DEV_BSIZE) ||
1544 P2BOUNDARY(offset, size, zv->zv_volblocksize)) {
1545 return (SET_ERROR(EINVAL));
1547 ASSERT(size <= zv->zv_volblocksize);
1549 /* Locate the extent this belongs to */
1550 ze = list_head(&zv->zv_extents);
1551 while (offset >= ze->ze_nblks * zv->zv_volblocksize) {
1552 offset -= ze->ze_nblks * zv->zv_volblocksize;
1553 ze = list_next(&zv->zv_extents, ze);
1557 return (SET_ERROR(EINVAL));
1559 if (!ddi_in_panic())
1560 spa_config_enter(spa, SCL_STATE, FTAG, RW_READER);
1562 vd = vdev_lookup_top(spa, DVA_GET_VDEV(&ze->ze_dva));
1563 offset += DVA_GET_OFFSET(&ze->ze_dva);
1564 error = zvol_dumpio_vdev(vd, addr, offset, DVA_GET_OFFSET(&ze->ze_dva),
1565 size, doread, isdump);
1567 if (!ddi_in_panic())
1568 spa_config_exit(spa, SCL_STATE, FTAG);
1574 zvol_strategy(buf_t *bp)
1576 zfs_soft_state_t *zs = NULL;
1577 #else /* !illumos */
1579 zvol_strategy(struct bio *bp)
1581 #endif /* illumos */
1583 uint64_t off, volsize;
1590 boolean_t doread = bp->b_flags & B_READ;
1592 boolean_t doread = 0;
1594 boolean_t is_dumpified;
1598 if (getminor(bp->b_edev) == 0) {
1599 error = SET_ERROR(EINVAL);
1601 zs = ddi_get_soft_state(zfsdev_state, getminor(bp->b_edev));
1603 error = SET_ERROR(ENXIO);
1604 else if (zs->zss_type != ZSST_ZVOL)
1605 error = SET_ERROR(EINVAL);
1609 bioerror(bp, error);
1616 if (!(bp->b_flags & B_READ) && (zv->zv_flags & ZVOL_RDONLY)) {
1617 bioerror(bp, EROFS);
1622 off = ldbtob(bp->b_blkno);
1623 #else /* !illumos */
1625 zv = bp->bio_to->private;
1627 zv = bp->bio_dev->si_drv2;
1630 error = SET_ERROR(ENXIO);
1634 if (bp->bio_cmd != BIO_READ && (zv->zv_flags & ZVOL_RDONLY)) {
1635 error = SET_ERROR(EROFS);
1639 switch (bp->bio_cmd) {
1652 off = bp->bio_offset;
1653 #endif /* illumos */
1654 volsize = zv->zv_volsize;
1661 addr = bp->b_un.b_addr;
1662 resid = bp->b_bcount;
1664 if (resid > 0 && (off < 0 || off >= volsize)) {
1670 is_dumpified = zv->zv_flags & ZVOL_DUMPIFIED;
1671 sync = ((!(bp->b_flags & B_ASYNC) &&
1672 !(zv->zv_flags & ZVOL_WCE)) ||
1673 (zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS)) &&
1674 !doread && !is_dumpified;
1675 #else /* !illumos */
1676 addr = bp->bio_data;
1677 resid = bp->bio_length;
1679 if (resid > 0 && (off < 0 || off >= volsize)) {
1680 error = SET_ERROR(EIO);
1684 is_dumpified = B_FALSE;
1685 sync = !doread && !is_dumpified &&
1686 zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS;
1687 #endif /* illumos */
1690 * There must be no buffer changes when doing a dmu_sync() because
1691 * we can't change the data whilst calculating the checksum.
1693 rl = zfs_range_lock(&zv->zv_znode, off, resid,
1694 doread ? RL_READER : RL_WRITER);
1697 if (bp->bio_cmd == BIO_DELETE) {
1698 dmu_tx_t *tx = dmu_tx_create(zv->zv_objset);
1699 error = dmu_tx_assign(tx, TXG_WAIT);
1703 zvol_log_truncate(zv, tx, off, resid, sync);
1705 error = dmu_free_long_range(zv->zv_objset, ZVOL_OBJ,
1712 while (resid != 0 && off < volsize) {
1713 size_t size = MIN(resid, zvol_maxphys);
1716 size = MIN(size, P2END(off, zv->zv_volblocksize) - off);
1717 error = zvol_dumpio(zv, addr, off, size,
1719 } else if (doread) {
1723 error = dmu_read(os, ZVOL_OBJ, off, size, addr,
1726 dmu_tx_t *tx = dmu_tx_create(os);
1727 dmu_tx_hold_write(tx, ZVOL_OBJ, off, size);
1728 error = dmu_tx_assign(tx, TXG_WAIT);
1732 dmu_write(os, ZVOL_OBJ, off, size, addr, tx);
1733 zvol_log_write(zv, tx, off, size, sync);
1738 /* convert checksum errors into IO errors */
1739 if (error == ECKSUM)
1740 error = SET_ERROR(EIO);
1750 zfs_range_unlock(rl);
1753 if ((bp->b_resid = resid) == bp->b_bcount)
1754 bioerror(bp, off > volsize ? EINVAL : error);
1757 zil_commit(zv->zv_zilog, ZVOL_OBJ);
1761 #else /* !illumos */
1762 bp->bio_completed = bp->bio_length - resid;
1763 if (bp->bio_completed < bp->bio_length && off > volsize)
1768 zil_commit(zv->zv_zilog, ZVOL_OBJ);
1772 g_io_deliver(bp, error);
1774 biofinish(bp, NULL, error);
1775 #endif /* illumos */
1780 * Set the buffer count to the zvol maximum transfer.
1781 * Using our own routine instead of the default minphys()
1782 * means that for larger writes we write bigger buffers on X86
1783 * (128K instead of 56K) and flush the disk write cache less often
1784 * (every zvol_maxphys - currently 1MB) instead of minphys (currently
1785 * 56K on X86 and 128K on sparc).
1788 zvol_minphys(struct buf *bp)
1790 if (bp->b_bcount > zvol_maxphys)
1791 bp->b_bcount = zvol_maxphys;
1795 zvol_dump(dev_t dev, caddr_t addr, daddr_t blkno, int nblocks)
1797 minor_t minor = getminor(dev);
1804 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL);
1806 return (SET_ERROR(ENXIO));
1808 if ((zv->zv_flags & ZVOL_DUMPIFIED) == 0)
1809 return (SET_ERROR(EINVAL));
1811 boff = ldbtob(blkno);
1812 resid = ldbtob(nblocks);
1814 VERIFY3U(boff + resid, <=, zv->zv_volsize);
1817 size = MIN(resid, P2END(boff, zv->zv_volblocksize) - boff);
1818 error = zvol_dumpio(zv, addr, boff, size, B_FALSE, B_TRUE);
1831 zvol_read(dev_t dev, uio_t *uio, cred_t *cr)
1833 minor_t minor = getminor(dev);
1834 #else /* !illumos */
1836 zvol_read(struct cdev *dev, struct uio *uio, int ioflag)
1838 #endif /* illumos */
1845 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL);
1847 return (SET_ERROR(ENXIO));
1852 volsize = zv->zv_volsize;
1853 /* uio_loffset == volsize isn't an error as its required for EOF processing. */
1854 if (uio->uio_resid > 0 &&
1855 (uio->uio_loffset < 0 || uio->uio_loffset > volsize))
1856 return (SET_ERROR(EIO));
1859 if (zv->zv_flags & ZVOL_DUMPIFIED) {
1860 error = physio(zvol_strategy, NULL, dev, B_READ,
1866 rl = zfs_range_lock(&zv->zv_znode, uio->uio_loffset, uio->uio_resid,
1868 while (uio->uio_resid > 0 && uio->uio_loffset < volsize) {
1869 uint64_t bytes = MIN(uio->uio_resid, DMU_MAX_ACCESS >> 1);
1871 /* don't read past the end */
1872 if (bytes > volsize - uio->uio_loffset)
1873 bytes = volsize - uio->uio_loffset;
1875 error = dmu_read_uio_dnode(zv->zv_dn, uio, bytes);
1877 /* convert checksum errors into IO errors */
1878 if (error == ECKSUM)
1879 error = SET_ERROR(EIO);
1883 zfs_range_unlock(rl);
1890 zvol_write(dev_t dev, uio_t *uio, cred_t *cr)
1892 minor_t minor = getminor(dev);
1893 #else /* !illumos */
1895 zvol_write(struct cdev *dev, struct uio *uio, int ioflag)
1897 #endif /* illumos */
1905 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL);
1907 return (SET_ERROR(ENXIO));
1912 volsize = zv->zv_volsize;
1913 /* uio_loffset == volsize isn't an error as its required for EOF processing. */
1914 if (uio->uio_resid > 0 &&
1915 (uio->uio_loffset < 0 || uio->uio_loffset > volsize))
1916 return (SET_ERROR(EIO));
1919 if (zv->zv_flags & ZVOL_DUMPIFIED) {
1920 error = physio(zvol_strategy, NULL, dev, B_WRITE,
1925 sync = !(zv->zv_flags & ZVOL_WCE) ||
1927 sync = (ioflag & IO_SYNC) ||
1929 (zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS);
1931 rl = zfs_range_lock(&zv->zv_znode, uio->uio_loffset, uio->uio_resid,
1933 while (uio->uio_resid > 0 && uio->uio_loffset < volsize) {
1934 uint64_t bytes = MIN(uio->uio_resid, DMU_MAX_ACCESS >> 1);
1935 uint64_t off = uio->uio_loffset;
1936 dmu_tx_t *tx = dmu_tx_create(zv->zv_objset);
1938 if (bytes > volsize - off) /* don't write past the end */
1939 bytes = volsize - off;
1941 dmu_tx_hold_write(tx, ZVOL_OBJ, off, bytes);
1942 error = dmu_tx_assign(tx, TXG_WAIT);
1947 error = dmu_write_uio_dnode(zv->zv_dn, uio, bytes, tx);
1949 zvol_log_write(zv, tx, off, bytes, sync);
1955 zfs_range_unlock(rl);
1957 zil_commit(zv->zv_zilog, ZVOL_OBJ);
1963 zvol_getefi(void *arg, int flag, uint64_t vs, uint8_t bs)
1965 struct uuid uuid = EFI_RESERVED;
1966 efi_gpe_t gpe = { 0 };
1972 if (ddi_copyin(arg, &efi, sizeof (dk_efi_t), flag))
1973 return (SET_ERROR(EFAULT));
1974 ptr = (char *)(uintptr_t)efi.dki_data_64;
1975 length = efi.dki_length;
1977 * Some clients may attempt to request a PMBR for the
1978 * zvol. Currently this interface will return EINVAL to
1979 * such requests. These requests could be supported by
1980 * adding a check for lba == 0 and consing up an appropriate
1983 if (efi.dki_lba < 1 || efi.dki_lba > 2 || length <= 0)
1984 return (SET_ERROR(EINVAL));
1986 gpe.efi_gpe_StartingLBA = LE_64(34ULL);
1987 gpe.efi_gpe_EndingLBA = LE_64((vs >> bs) - 1);
1988 UUID_LE_CONVERT(gpe.efi_gpe_PartitionTypeGUID, uuid);
1990 if (efi.dki_lba == 1) {
1991 efi_gpt_t gpt = { 0 };
1993 gpt.efi_gpt_Signature = LE_64(EFI_SIGNATURE);
1994 gpt.efi_gpt_Revision = LE_32(EFI_VERSION_CURRENT);
1995 gpt.efi_gpt_HeaderSize = LE_32(sizeof (gpt));
1996 gpt.efi_gpt_MyLBA = LE_64(1ULL);
1997 gpt.efi_gpt_FirstUsableLBA = LE_64(34ULL);
1998 gpt.efi_gpt_LastUsableLBA = LE_64((vs >> bs) - 1);
1999 gpt.efi_gpt_PartitionEntryLBA = LE_64(2ULL);
2000 gpt.efi_gpt_NumberOfPartitionEntries = LE_32(1);
2001 gpt.efi_gpt_SizeOfPartitionEntry =
2002 LE_32(sizeof (efi_gpe_t));
2003 CRC32(crc, &gpe, sizeof (gpe), -1U, crc32_table);
2004 gpt.efi_gpt_PartitionEntryArrayCRC32 = LE_32(~crc);
2005 CRC32(crc, &gpt, sizeof (gpt), -1U, crc32_table);
2006 gpt.efi_gpt_HeaderCRC32 = LE_32(~crc);
2007 if (ddi_copyout(&gpt, ptr, MIN(sizeof (gpt), length),
2009 return (SET_ERROR(EFAULT));
2010 ptr += sizeof (gpt);
2011 length -= sizeof (gpt);
2013 if (length > 0 && ddi_copyout(&gpe, ptr, MIN(sizeof (gpe),
2015 return (SET_ERROR(EFAULT));
2020 * BEGIN entry points to allow external callers access to the volume.
2023 * Return the volume parameters needed for access from an external caller.
2024 * These values are invariant as long as the volume is held open.
2027 zvol_get_volume_params(minor_t minor, uint64_t *blksize,
2028 uint64_t *max_xfer_len, void **minor_hdl, void **objset_hdl, void **zil_hdl,
2029 void **rl_hdl, void **dnode_hdl)
2033 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL);
2035 return (SET_ERROR(ENXIO));
2036 if (zv->zv_flags & ZVOL_DUMPIFIED)
2037 return (SET_ERROR(ENXIO));
2039 ASSERT(blksize && max_xfer_len && minor_hdl &&
2040 objset_hdl && zil_hdl && rl_hdl && dnode_hdl);
2042 *blksize = zv->zv_volblocksize;
2043 *max_xfer_len = (uint64_t)zvol_maxphys;
2045 *objset_hdl = zv->zv_objset;
2046 *zil_hdl = zv->zv_zilog;
2047 *rl_hdl = &zv->zv_znode;
2048 *dnode_hdl = zv->zv_dn;
2053 * Return the current volume size to an external caller.
2054 * The size can change while the volume is open.
2057 zvol_get_volume_size(void *minor_hdl)
2059 zvol_state_t *zv = minor_hdl;
2061 return (zv->zv_volsize);
2065 * Return the current WCE setting to an external caller.
2066 * The WCE setting can change while the volume is open.
2069 zvol_get_volume_wce(void *minor_hdl)
2071 zvol_state_t *zv = minor_hdl;
2073 return ((zv->zv_flags & ZVOL_WCE) ? 1 : 0);
2077 * Entry point for external callers to zvol_log_write
2080 zvol_log_write_minor(void *minor_hdl, dmu_tx_t *tx, offset_t off, ssize_t resid,
2083 zvol_state_t *zv = minor_hdl;
2085 zvol_log_write(zv, tx, off, resid, sync);
2088 * END entry points to allow external callers access to the volume.
2090 #endif /* illumos */
2093 * Log a DKIOCFREE/free-long-range to the ZIL with TX_TRUNCATE.
2096 zvol_log_truncate(zvol_state_t *zv, dmu_tx_t *tx, uint64_t off, uint64_t len,
2101 zilog_t *zilog = zv->zv_zilog;
2103 if (zil_replaying(zilog, tx))
2106 itx = zil_itx_create(TX_TRUNCATE, sizeof (*lr));
2107 lr = (lr_truncate_t *)&itx->itx_lr;
2108 lr->lr_foid = ZVOL_OBJ;
2109 lr->lr_offset = off;
2110 lr->lr_length = len;
2112 itx->itx_sync = (sync || zv->zv_sync_cnt != 0);
2113 zil_itx_assign(zilog, itx, tx);
2118 * Dirtbag ioctls to support mkfs(1M) for UFS filesystems. See dkio(7I).
2119 * Also a dirtbag dkio ioctl for unmap/free-block functionality.
2123 zvol_ioctl(dev_t dev, int cmd, intptr_t arg, int flag, cred_t *cr, int *rvalp)
2126 struct dk_callback *dkc;
2130 mutex_enter(&zfsdev_state_lock);
2132 zv = zfsdev_get_soft_state(getminor(dev), ZSST_ZVOL);
2135 mutex_exit(&zfsdev_state_lock);
2136 return (SET_ERROR(ENXIO));
2138 ASSERT(zv->zv_total_opens > 0);
2144 struct dk_cinfo dki;
2146 bzero(&dki, sizeof (dki));
2147 (void) strcpy(dki.dki_cname, "zvol");
2148 (void) strcpy(dki.dki_dname, "zvol");
2149 dki.dki_ctype = DKC_UNKNOWN;
2150 dki.dki_unit = getminor(dev);
2151 dki.dki_maxtransfer =
2152 1 << (SPA_OLD_MAXBLOCKSHIFT - zv->zv_min_bs);
2153 mutex_exit(&zfsdev_state_lock);
2154 if (ddi_copyout(&dki, (void *)arg, sizeof (dki), flag))
2155 error = SET_ERROR(EFAULT);
2159 case DKIOCGMEDIAINFO:
2161 struct dk_minfo dkm;
2163 bzero(&dkm, sizeof (dkm));
2164 dkm.dki_lbsize = 1U << zv->zv_min_bs;
2165 dkm.dki_capacity = zv->zv_volsize >> zv->zv_min_bs;
2166 dkm.dki_media_type = DK_UNKNOWN;
2167 mutex_exit(&zfsdev_state_lock);
2168 if (ddi_copyout(&dkm, (void *)arg, sizeof (dkm), flag))
2169 error = SET_ERROR(EFAULT);
2173 case DKIOCGMEDIAINFOEXT:
2175 struct dk_minfo_ext dkmext;
2177 bzero(&dkmext, sizeof (dkmext));
2178 dkmext.dki_lbsize = 1U << zv->zv_min_bs;
2179 dkmext.dki_pbsize = zv->zv_volblocksize;
2180 dkmext.dki_capacity = zv->zv_volsize >> zv->zv_min_bs;
2181 dkmext.dki_media_type = DK_UNKNOWN;
2182 mutex_exit(&zfsdev_state_lock);
2183 if (ddi_copyout(&dkmext, (void *)arg, sizeof (dkmext), flag))
2184 error = SET_ERROR(EFAULT);
2190 uint64_t vs = zv->zv_volsize;
2191 uint8_t bs = zv->zv_min_bs;
2193 mutex_exit(&zfsdev_state_lock);
2194 error = zvol_getefi((void *)arg, flag, vs, bs);
2198 case DKIOCFLUSHWRITECACHE:
2199 dkc = (struct dk_callback *)arg;
2200 mutex_exit(&zfsdev_state_lock);
2201 zil_commit(zv->zv_zilog, ZVOL_OBJ);
2202 if ((flag & FKIOCTL) && dkc != NULL && dkc->dkc_callback) {
2203 (*dkc->dkc_callback)(dkc->dkc_cookie, error);
2210 int wce = (zv->zv_flags & ZVOL_WCE) ? 1 : 0;
2211 if (ddi_copyout(&wce, (void *)arg, sizeof (int),
2213 error = SET_ERROR(EFAULT);
2219 if (ddi_copyin((void *)arg, &wce, sizeof (int),
2221 error = SET_ERROR(EFAULT);
2225 zv->zv_flags |= ZVOL_WCE;
2226 mutex_exit(&zfsdev_state_lock);
2228 zv->zv_flags &= ~ZVOL_WCE;
2229 mutex_exit(&zfsdev_state_lock);
2230 zil_commit(zv->zv_zilog, ZVOL_OBJ);
2238 * commands using these (like prtvtoc) expect ENOTSUP
2239 * since we're emulating an EFI label
2241 error = SET_ERROR(ENOTSUP);
2245 rl = zfs_range_lock(&zv->zv_znode, 0, zv->zv_volsize,
2247 error = zvol_dumpify(zv);
2248 zfs_range_unlock(rl);
2252 if (!(zv->zv_flags & ZVOL_DUMPIFIED))
2254 rl = zfs_range_lock(&zv->zv_znode, 0, zv->zv_volsize,
2256 error = zvol_dump_fini(zv);
2257 zfs_range_unlock(rl);
2265 if (!zvol_unmap_enabled)
2268 if (ddi_copyin((void *)arg, &df, sizeof (df), flag)) {
2269 error = SET_ERROR(EFAULT);
2274 * Apply Postel's Law to length-checking. If they overshoot,
2275 * just blank out until the end, if there's a need to blank
2278 if (df.df_start >= zv->zv_volsize)
2279 break; /* No need to do anything... */
2281 mutex_exit(&zfsdev_state_lock);
2283 rl = zfs_range_lock(&zv->zv_znode, df.df_start, df.df_length,
2285 tx = dmu_tx_create(zv->zv_objset);
2286 dmu_tx_mark_netfree(tx);
2287 error = dmu_tx_assign(tx, TXG_WAIT);
2291 zvol_log_truncate(zv, tx, df.df_start,
2292 df.df_length, B_TRUE);
2294 error = dmu_free_long_range(zv->zv_objset, ZVOL_OBJ,
2295 df.df_start, df.df_length);
2298 zfs_range_unlock(rl);
2301 * If the write-cache is disabled, 'sync' property
2302 * is set to 'always', or if the caller is asking for
2303 * a synchronous free, commit this operation to the zil.
2304 * This will sync any previous uncommitted writes to the
2306 * Can be overridden by the zvol_unmap_sync_enabled tunable.
2308 if ((error == 0) && zvol_unmap_sync_enabled &&
2309 (!(zv->zv_flags & ZVOL_WCE) ||
2310 (zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS) ||
2311 (df.df_flags & DF_WAIT_SYNC))) {
2312 zil_commit(zv->zv_zilog, ZVOL_OBJ);
2319 error = SET_ERROR(ENOTTY);
2323 mutex_exit(&zfsdev_state_lock);
2326 #endif /* illumos */
2331 return (zvol_minors != 0);
2337 VERIFY(ddi_soft_state_init(&zfsdev_state, sizeof (zfs_soft_state_t),
2340 mutex_init(&zfsdev_state_lock, NULL, MUTEX_DEFAULT, NULL);
2342 ZFS_LOG(1, "ZVOL Initialized.");
2350 mutex_destroy(&zfsdev_state_lock);
2352 ddi_soft_state_fini(&zfsdev_state);
2353 ZFS_LOG(1, "ZVOL Deinitialized.");
2359 zfs_mvdev_dump_feature_check(void *arg, dmu_tx_t *tx)
2361 spa_t *spa = dmu_tx_pool(tx)->dp_spa;
2363 if (spa_feature_is_active(spa, SPA_FEATURE_MULTI_VDEV_CRASH_DUMP))
2370 zfs_mvdev_dump_activate_feature_sync(void *arg, dmu_tx_t *tx)
2372 spa_t *spa = dmu_tx_pool(tx)->dp_spa;
2374 spa_feature_incr(spa, SPA_FEATURE_MULTI_VDEV_CRASH_DUMP, tx);
2378 zvol_dump_init(zvol_state_t *zv, boolean_t resize)
2382 objset_t *os = zv->zv_objset;
2383 spa_t *spa = dmu_objset_spa(os);
2384 vdev_t *vd = spa->spa_root_vdev;
2385 nvlist_t *nv = NULL;
2386 uint64_t version = spa_version(spa);
2387 uint64_t checksum, compress, refresrv, vbs, dedup;
2389 ASSERT(MUTEX_HELD(&zfsdev_state_lock));
2390 ASSERT(vd->vdev_ops == &vdev_root_ops);
2392 error = dmu_free_long_range(zv->zv_objset, ZVOL_OBJ, 0,
2396 /* wait for dmu_free_long_range to actually free the blocks */
2397 txg_wait_synced(dmu_objset_pool(zv->zv_objset), 0);
2400 * If the pool on which the dump device is being initialized has more
2401 * than one child vdev, check that the MULTI_VDEV_CRASH_DUMP feature is
2402 * enabled. If so, bump that feature's counter to indicate that the
2403 * feature is active. We also check the vdev type to handle the
2405 * # zpool create test raidz disk1 disk2 disk3
2406 * Now have spa_root_vdev->vdev_children == 1 (the raidz vdev),
2407 * the raidz vdev itself has 3 children.
2409 if (vd->vdev_children > 1 || vd->vdev_ops == &vdev_raidz_ops) {
2410 if (!spa_feature_is_enabled(spa,
2411 SPA_FEATURE_MULTI_VDEV_CRASH_DUMP))
2412 return (SET_ERROR(ENOTSUP));
2413 (void) dsl_sync_task(spa_name(spa),
2414 zfs_mvdev_dump_feature_check,
2415 zfs_mvdev_dump_activate_feature_sync, NULL,
2416 2, ZFS_SPACE_CHECK_RESERVED);
2420 error = dsl_prop_get_integer(zv->zv_name,
2421 zfs_prop_to_name(ZFS_PROP_COMPRESSION), &compress, NULL);
2423 error = dsl_prop_get_integer(zv->zv_name,
2424 zfs_prop_to_name(ZFS_PROP_CHECKSUM), &checksum,
2428 error = dsl_prop_get_integer(zv->zv_name,
2429 zfs_prop_to_name(ZFS_PROP_REFRESERVATION),
2433 error = dsl_prop_get_integer(zv->zv_name,
2434 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &vbs,
2437 if (version >= SPA_VERSION_DEDUP && error == 0) {
2438 error = dsl_prop_get_integer(zv->zv_name,
2439 zfs_prop_to_name(ZFS_PROP_DEDUP), &dedup, NULL);
2445 tx = dmu_tx_create(os);
2446 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL);
2447 dmu_tx_hold_bonus(tx, ZVOL_OBJ);
2448 error = dmu_tx_assign(tx, TXG_WAIT);
2455 * If we are resizing the dump device then we only need to
2456 * update the refreservation to match the newly updated
2457 * zvolsize. Otherwise, we save off the original state of the
2458 * zvol so that we can restore them if the zvol is ever undumpified.
2461 error = zap_update(os, ZVOL_ZAP_OBJ,
2462 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1,
2463 &zv->zv_volsize, tx);
2465 error = zap_update(os, ZVOL_ZAP_OBJ,
2466 zfs_prop_to_name(ZFS_PROP_COMPRESSION), 8, 1,
2469 error = zap_update(os, ZVOL_ZAP_OBJ,
2470 zfs_prop_to_name(ZFS_PROP_CHECKSUM), 8, 1,
2474 error = zap_update(os, ZVOL_ZAP_OBJ,
2475 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1,
2479 error = zap_update(os, ZVOL_ZAP_OBJ,
2480 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), 8, 1,
2484 error = dmu_object_set_blocksize(
2485 os, ZVOL_OBJ, SPA_OLD_MAXBLOCKSIZE, 0, tx);
2487 if (version >= SPA_VERSION_DEDUP && error == 0) {
2488 error = zap_update(os, ZVOL_ZAP_OBJ,
2489 zfs_prop_to_name(ZFS_PROP_DEDUP), 8, 1,
2493 zv->zv_volblocksize = SPA_OLD_MAXBLOCKSIZE;
2498 * We only need update the zvol's property if we are initializing
2499 * the dump area for the first time.
2501 if (error == 0 && !resize) {
2503 * If MULTI_VDEV_CRASH_DUMP is active, use the NOPARITY checksum
2504 * function. Otherwise, use the old default -- OFF.
2506 checksum = spa_feature_is_active(spa,
2507 SPA_FEATURE_MULTI_VDEV_CRASH_DUMP) ? ZIO_CHECKSUM_NOPARITY :
2510 VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0);
2511 VERIFY(nvlist_add_uint64(nv,
2512 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 0) == 0);
2513 VERIFY(nvlist_add_uint64(nv,
2514 zfs_prop_to_name(ZFS_PROP_COMPRESSION),
2515 ZIO_COMPRESS_OFF) == 0);
2516 VERIFY(nvlist_add_uint64(nv,
2517 zfs_prop_to_name(ZFS_PROP_CHECKSUM),
2519 if (version >= SPA_VERSION_DEDUP) {
2520 VERIFY(nvlist_add_uint64(nv,
2521 zfs_prop_to_name(ZFS_PROP_DEDUP),
2522 ZIO_CHECKSUM_OFF) == 0);
2525 error = zfs_set_prop_nvlist(zv->zv_name, ZPROP_SRC_LOCAL,
2530 /* Allocate the space for the dump */
2532 error = zvol_prealloc(zv);
2537 zvol_dumpify(zvol_state_t *zv)
2540 uint64_t dumpsize = 0;
2542 objset_t *os = zv->zv_objset;
2544 if (zv->zv_flags & ZVOL_RDONLY)
2545 return (SET_ERROR(EROFS));
2547 if (zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE,
2548 8, 1, &dumpsize) != 0 || dumpsize != zv->zv_volsize) {
2549 boolean_t resize = (dumpsize > 0);
2551 if ((error = zvol_dump_init(zv, resize)) != 0) {
2552 (void) zvol_dump_fini(zv);
2558 * Build up our lba mapping.
2560 error = zvol_get_lbas(zv);
2562 (void) zvol_dump_fini(zv);
2566 tx = dmu_tx_create(os);
2567 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL);
2568 error = dmu_tx_assign(tx, TXG_WAIT);
2571 (void) zvol_dump_fini(zv);
2575 zv->zv_flags |= ZVOL_DUMPIFIED;
2576 error = zap_update(os, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, 8, 1,
2577 &zv->zv_volsize, tx);
2581 (void) zvol_dump_fini(zv);
2585 txg_wait_synced(dmu_objset_pool(os), 0);
2590 zvol_dump_fini(zvol_state_t *zv)
2593 objset_t *os = zv->zv_objset;
2596 uint64_t checksum, compress, refresrv, vbs, dedup;
2597 uint64_t version = spa_version(dmu_objset_spa(zv->zv_objset));
2600 * Attempt to restore the zvol back to its pre-dumpified state.
2601 * This is a best-effort attempt as it's possible that not all
2602 * of these properties were initialized during the dumpify process
2603 * (i.e. error during zvol_dump_init).
2606 tx = dmu_tx_create(os);
2607 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL);
2608 error = dmu_tx_assign(tx, TXG_WAIT);
2613 (void) zap_remove(os, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, tx);
2616 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ,
2617 zfs_prop_to_name(ZFS_PROP_CHECKSUM), 8, 1, &checksum);
2618 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ,
2619 zfs_prop_to_name(ZFS_PROP_COMPRESSION), 8, 1, &compress);
2620 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ,
2621 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1, &refresrv);
2622 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ,
2623 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), 8, 1, &vbs);
2625 VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0);
2626 (void) nvlist_add_uint64(nv,
2627 zfs_prop_to_name(ZFS_PROP_CHECKSUM), checksum);
2628 (void) nvlist_add_uint64(nv,
2629 zfs_prop_to_name(ZFS_PROP_COMPRESSION), compress);
2630 (void) nvlist_add_uint64(nv,
2631 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), refresrv);
2632 if (version >= SPA_VERSION_DEDUP &&
2633 zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ,
2634 zfs_prop_to_name(ZFS_PROP_DEDUP), 8, 1, &dedup) == 0) {
2635 (void) nvlist_add_uint64(nv,
2636 zfs_prop_to_name(ZFS_PROP_DEDUP), dedup);
2638 (void) zfs_set_prop_nvlist(zv->zv_name, ZPROP_SRC_LOCAL,
2642 zvol_free_extents(zv);
2643 zv->zv_flags &= ~ZVOL_DUMPIFIED;
2644 (void) dmu_free_long_range(os, ZVOL_OBJ, 0, DMU_OBJECT_END);
2645 /* wait for dmu_free_long_range to actually free the blocks */
2646 txg_wait_synced(dmu_objset_pool(zv->zv_objset), 0);
2647 tx = dmu_tx_create(os);
2648 dmu_tx_hold_bonus(tx, ZVOL_OBJ);
2649 error = dmu_tx_assign(tx, TXG_WAIT);
2654 if (dmu_object_set_blocksize(os, ZVOL_OBJ, vbs, 0, tx) == 0)
2655 zv->zv_volblocksize = vbs;
2660 #else /* !illumos */
2663 zvol_geom_run(zvol_state_t *zv)
2665 struct g_provider *pp;
2667 pp = zv->zv_provider;
2668 g_error_provider(pp, 0);
2670 kproc_kthread_add(zvol_geom_worker, zv, &zfsproc, NULL, 0, 0,
2671 "zfskern", "zvol %s", pp->name + sizeof(ZVOL_DRIVER));
2675 zvol_geom_destroy(zvol_state_t *zv)
2677 struct g_provider *pp;
2679 g_topology_assert();
2681 mtx_lock(&zv->zv_queue_mtx);
2683 wakeup_one(&zv->zv_queue);
2684 while (zv->zv_state != 2)
2685 msleep(&zv->zv_state, &zv->zv_queue_mtx, 0, "zvol:w", 0);
2686 mtx_destroy(&zv->zv_queue_mtx);
2688 pp = zv->zv_provider;
2689 zv->zv_provider = NULL;
2691 g_wither_geom(pp->geom, ENXIO);
2695 zvol_geom_access(struct g_provider *pp, int acr, int acw, int ace)
2697 int count, error, flags;
2699 g_topology_assert();
2702 * To make it easier we expect either open or close, but not both
2705 KASSERT((acr >= 0 && acw >= 0 && ace >= 0) ||
2706 (acr <= 0 && acw <= 0 && ace <= 0),
2707 ("Unsupported access request to %s (acr=%d, acw=%d, ace=%d).",
2708 pp->name, acr, acw, ace));
2710 if (pp->private == NULL) {
2711 if (acr <= 0 && acw <= 0 && ace <= 0)
2717 * We don't pass FEXCL flag to zvol_open()/zvol_close() if ace != 0,
2718 * because GEOM already handles that and handles it a bit differently.
2719 * GEOM allows for multiple read/exclusive consumers and ZFS allows
2720 * only one exclusive consumer, no matter if it is reader or writer.
2721 * I like better the way GEOM works so I'll leave it for GEOM to
2722 * decide what to do.
2725 count = acr + acw + ace;
2730 if (acr != 0 || ace != 0)
2735 g_topology_unlock();
2737 error = zvol_open(pp, flags, count);
2739 error = zvol_close(pp, flags, -count);
2745 zvol_geom_start(struct bio *bp)
2750 zv = bp->bio_to->private;
2752 switch (bp->bio_cmd) {
2754 if (!THREAD_CAN_SLEEP())
2756 zil_commit(zv->zv_zilog, ZVOL_OBJ);
2757 g_io_deliver(bp, 0);
2762 if (!THREAD_CAN_SLEEP())
2767 spa_t *spa = dmu_objset_spa(zv->zv_objset);
2768 uint64_t refd, avail, usedobjs, availobjs, val;
2770 if (g_handleattr_int(bp, "GEOM::candelete", 1))
2772 if (strcmp(bp->bio_attribute, "blocksavail") == 0) {
2773 dmu_objset_space(zv->zv_objset, &refd, &avail,
2774 &usedobjs, &availobjs);
2775 if (g_handleattr_off_t(bp, "blocksavail",
2778 } else if (strcmp(bp->bio_attribute, "blocksused") == 0) {
2779 dmu_objset_space(zv->zv_objset, &refd, &avail,
2780 &usedobjs, &availobjs);
2781 if (g_handleattr_off_t(bp, "blocksused",
2784 } else if (strcmp(bp->bio_attribute, "poolblocksavail") == 0) {
2785 avail = metaslab_class_get_space(spa_normal_class(spa));
2786 avail -= metaslab_class_get_alloc(spa_normal_class(spa));
2787 if (g_handleattr_off_t(bp, "poolblocksavail",
2790 } else if (strcmp(bp->bio_attribute, "poolblocksused") == 0) {
2791 refd = metaslab_class_get_alloc(spa_normal_class(spa));
2792 if (g_handleattr_off_t(bp, "poolblocksused",
2799 g_io_deliver(bp, EOPNOTSUPP);
2805 mtx_lock(&zv->zv_queue_mtx);
2806 first = (bioq_first(&zv->zv_queue) == NULL);
2807 bioq_insert_tail(&zv->zv_queue, bp);
2808 mtx_unlock(&zv->zv_queue_mtx);
2810 wakeup_one(&zv->zv_queue);
2814 zvol_geom_worker(void *arg)
2819 thread_lock(curthread);
2820 sched_prio(curthread, PRIBIO);
2821 thread_unlock(curthread);
2825 mtx_lock(&zv->zv_queue_mtx);
2826 bp = bioq_takefirst(&zv->zv_queue);
2828 if (zv->zv_state == 1) {
2830 wakeup(&zv->zv_state);
2831 mtx_unlock(&zv->zv_queue_mtx);
2834 msleep(&zv->zv_queue, &zv->zv_queue_mtx, PRIBIO | PDROP,
2838 mtx_unlock(&zv->zv_queue_mtx);
2839 switch (bp->bio_cmd) {
2841 zil_commit(zv->zv_zilog, ZVOL_OBJ);
2842 g_io_deliver(bp, 0);
2850 g_io_deliver(bp, EOPNOTSUPP);
2856 extern boolean_t dataset_name_hidden(const char *name);
2859 zvol_create_snapshots(objset_t *os, const char *name)
2861 uint64_t cookie, obj;
2866 sname = kmem_alloc(MAXPATHLEN, KM_SLEEP);
2869 (void) dmu_objset_find(name, dmu_objset_prefetch, NULL,
2874 len = snprintf(sname, MAXPATHLEN, "%s@", name);
2875 if (len >= MAXPATHLEN) {
2876 dmu_objset_rele(os, FTAG);
2877 error = ENAMETOOLONG;
2881 dsl_pool_config_enter(dmu_objset_pool(os), FTAG);
2882 error = dmu_snapshot_list_next(os, MAXPATHLEN - len,
2883 sname + len, &obj, &cookie, NULL);
2884 dsl_pool_config_exit(dmu_objset_pool(os), FTAG);
2886 if (error == ENOENT)
2891 error = zvol_create_minor(sname);
2892 if (error != 0 && error != EEXIST) {
2893 printf("ZFS WARNING: Unable to create ZVOL %s (error=%d).\n",
2899 kmem_free(sname, MAXPATHLEN);
2904 zvol_create_minors(const char *name)
2911 if (dataset_name_hidden(name))
2914 if ((error = dmu_objset_hold(name, FTAG, &os)) != 0) {
2915 printf("ZFS WARNING: Unable to put hold on %s (error=%d).\n",
2919 if (dmu_objset_type(os) == DMU_OST_ZVOL) {
2920 dsl_dataset_long_hold(os->os_dsl_dataset, FTAG);
2921 dsl_pool_rele(dmu_objset_pool(os), FTAG);
2922 error = zvol_create_minor(name);
2923 if (error == 0 || error == EEXIST) {
2924 error = zvol_create_snapshots(os, name);
2926 printf("ZFS WARNING: Unable to create ZVOL %s (error=%d).\n",
2929 dsl_dataset_long_rele(os->os_dsl_dataset, FTAG);
2930 dsl_dataset_rele(os->os_dsl_dataset, FTAG);
2933 if (dmu_objset_type(os) != DMU_OST_ZFS) {
2934 dmu_objset_rele(os, FTAG);
2938 osname = kmem_alloc(MAXPATHLEN, KM_SLEEP);
2939 if (snprintf(osname, MAXPATHLEN, "%s/", name) >= MAXPATHLEN) {
2940 dmu_objset_rele(os, FTAG);
2941 kmem_free(osname, MAXPATHLEN);
2944 p = osname + strlen(osname);
2945 len = MAXPATHLEN - (p - osname);
2948 /* Prefetch the datasets. */
2950 while (dmu_dir_list_next(os, len, p, NULL, &cookie) == 0) {
2951 if (!dataset_name_hidden(osname))
2952 (void) dmu_objset_prefetch(osname, NULL);
2957 while (dmu_dir_list_next(os, MAXPATHLEN - (p - osname), p, NULL,
2959 dmu_objset_rele(os, FTAG);
2960 (void)zvol_create_minors(osname);
2961 if ((error = dmu_objset_hold(name, FTAG, &os)) != 0) {
2962 printf("ZFS WARNING: Unable to put hold on %s (error=%d).\n",
2968 dmu_objset_rele(os, FTAG);
2969 kmem_free(osname, MAXPATHLEN);
2974 zvol_rename_minor(zvol_state_t *zv, const char *newname)
2977 struct g_provider *pp;
2980 ASSERT(MUTEX_HELD(&zfsdev_state_lock));
2982 if (zv->zv_volmode == ZFS_VOLMODE_GEOM) {
2984 pp = zv->zv_provider;
2989 zv->zv_provider = NULL;
2990 g_wither_provider(pp, ENXIO);
2992 pp = g_new_providerf(gp, "%s/%s", ZVOL_DRIVER, newname);
2993 pp->flags |= G_PF_DIRECT_RECEIVE | G_PF_DIRECT_SEND;
2994 pp->sectorsize = DEV_BSIZE;
2995 pp->mediasize = zv->zv_volsize;
2997 zv->zv_provider = pp;
2998 g_error_provider(pp, 0);
2999 g_topology_unlock();
3000 } else if (zv->zv_volmode == ZFS_VOLMODE_DEV) {
3001 struct make_dev_args args;
3003 if ((dev = zv->zv_dev) != NULL) {
3006 if (zv->zv_total_opens > 0) {
3007 zv->zv_flags &= ~ZVOL_EXCL;
3008 zv->zv_total_opens = 0;
3009 zvol_last_close(zv);
3013 make_dev_args_init(&args);
3014 args.mda_flags = MAKEDEV_CHECKNAME | MAKEDEV_WAITOK;
3015 args.mda_devsw = &zvol_cdevsw;
3017 args.mda_uid = UID_ROOT;
3018 args.mda_gid = GID_OPERATOR;
3019 args.mda_mode = 0640;
3020 args.mda_si_drv2 = zv;
3021 if (make_dev_s(&args, &zv->zv_dev,
3022 "%s/%s", ZVOL_DRIVER, newname) == 0)
3023 zv->zv_dev->si_iosize_max = MAXPHYS;
3025 strlcpy(zv->zv_name, newname, sizeof(zv->zv_name));
3029 zvol_rename_minors(const char *oldname, const char *newname)
3031 char name[MAXPATHLEN];
3032 struct g_provider *pp;
3034 size_t oldnamelen, newnamelen;
3037 boolean_t locked = B_FALSE;
3039 oldnamelen = strlen(oldname);
3040 newnamelen = strlen(newname);
3043 /* See comment in zvol_open(). */
3044 if (!MUTEX_HELD(&zfsdev_state_lock)) {
3045 mutex_enter(&zfsdev_state_lock);
3049 LIST_FOREACH(zv, &all_zvols, zv_links) {
3050 if (strcmp(zv->zv_name, oldname) == 0) {
3051 zvol_rename_minor(zv, newname);
3052 } else if (strncmp(zv->zv_name, oldname, oldnamelen) == 0 &&
3053 (zv->zv_name[oldnamelen] == '/' ||
3054 zv->zv_name[oldnamelen] == '@')) {
3055 snprintf(name, sizeof(name), "%s%c%s", newname,
3056 zv->zv_name[oldnamelen],
3057 zv->zv_name + oldnamelen + 1);
3058 zvol_rename_minor(zv, name);
3063 mutex_exit(&zfsdev_state_lock);
3068 zvol_d_open(struct cdev *dev, int flags, int fmt, struct thread *td)
3070 zvol_state_t *zv = dev->si_drv2;
3073 mutex_enter(&zfsdev_state_lock);
3074 if (zv->zv_total_opens == 0)
3075 err = zvol_first_open(zv);
3077 mutex_exit(&zfsdev_state_lock);
3080 if ((flags & FWRITE) && (zv->zv_flags & ZVOL_RDONLY)) {
3081 err = SET_ERROR(EROFS);
3084 if (zv->zv_flags & ZVOL_EXCL) {
3085 err = SET_ERROR(EBUSY);
3089 if (flags & FEXCL) {
3090 if (zv->zv_total_opens != 0) {
3091 err = SET_ERROR(EBUSY);
3094 zv->zv_flags |= ZVOL_EXCL;
3098 zv->zv_total_opens++;
3099 if (flags & (FSYNC | FDSYNC)) {
3101 if (zv->zv_sync_cnt == 1)
3102 zil_async_to_sync(zv->zv_zilog, ZVOL_OBJ);
3104 mutex_exit(&zfsdev_state_lock);
3107 if (zv->zv_total_opens == 0)
3108 zvol_last_close(zv);
3109 mutex_exit(&zfsdev_state_lock);
3114 zvol_d_close(struct cdev *dev, int flags, int fmt, struct thread *td)
3116 zvol_state_t *zv = dev->si_drv2;
3118 mutex_enter(&zfsdev_state_lock);
3119 if (zv->zv_flags & ZVOL_EXCL) {
3120 ASSERT(zv->zv_total_opens == 1);
3121 zv->zv_flags &= ~ZVOL_EXCL;
3125 * If the open count is zero, this is a spurious close.
3126 * That indicates a bug in the kernel / DDI framework.
3128 ASSERT(zv->zv_total_opens != 0);
3131 * You may get multiple opens, but only one close.
3133 zv->zv_total_opens--;
3134 if (flags & (FSYNC | FDSYNC))
3137 if (zv->zv_total_opens == 0)
3138 zvol_last_close(zv);
3140 mutex_exit(&zfsdev_state_lock);
3145 zvol_d_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td)
3149 off_t offset, length;
3156 KASSERT(zv->zv_total_opens > 0,
3157 ("Device with zero access count in zvol_d_ioctl"));
3159 i = IOCPARM_LEN(cmd);
3161 case DIOCGSECTORSIZE:
3162 *(u_int *)data = DEV_BSIZE;
3164 case DIOCGMEDIASIZE:
3165 *(off_t *)data = zv->zv_volsize;
3168 zil_commit(zv->zv_zilog, ZVOL_OBJ);
3171 if (!zvol_unmap_enabled)
3174 offset = ((off_t *)data)[0];
3175 length = ((off_t *)data)[1];
3176 if ((offset % DEV_BSIZE) != 0 || (length % DEV_BSIZE) != 0 ||
3177 offset < 0 || offset >= zv->zv_volsize ||
3179 printf("%s: offset=%jd length=%jd\n", __func__, offset,
3185 rl = zfs_range_lock(&zv->zv_znode, offset, length, RL_WRITER);
3186 dmu_tx_t *tx = dmu_tx_create(zv->zv_objset);
3187 error = dmu_tx_assign(tx, TXG_WAIT);
3192 sync = (zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS);
3193 zvol_log_truncate(zv, tx, offset, length, sync);
3195 error = dmu_free_long_range(zv->zv_objset, ZVOL_OBJ,
3198 zfs_range_unlock(rl);
3200 zil_commit(zv->zv_zilog, ZVOL_OBJ);
3202 case DIOCGSTRIPESIZE:
3203 *(off_t *)data = zv->zv_volblocksize;
3205 case DIOCGSTRIPEOFFSET:
3209 spa_t *spa = dmu_objset_spa(zv->zv_objset);
3210 struct diocgattr_arg *arg = (struct diocgattr_arg *)data;
3211 uint64_t refd, avail, usedobjs, availobjs;
3213 if (strcmp(arg->name, "GEOM::candelete") == 0)
3215 else if (strcmp(arg->name, "blocksavail") == 0) {
3216 dmu_objset_space(zv->zv_objset, &refd, &avail,
3217 &usedobjs, &availobjs);
3218 arg->value.off = avail / DEV_BSIZE;
3219 } else if (strcmp(arg->name, "blocksused") == 0) {
3220 dmu_objset_space(zv->zv_objset, &refd, &avail,
3221 &usedobjs, &availobjs);
3222 arg->value.off = refd / DEV_BSIZE;
3223 } else if (strcmp(arg->name, "poolblocksavail") == 0) {
3224 avail = metaslab_class_get_space(spa_normal_class(spa));
3225 avail -= metaslab_class_get_alloc(spa_normal_class(spa));
3226 arg->value.off = avail / DEV_BSIZE;
3227 } else if (strcmp(arg->name, "poolblocksused") == 0) {
3228 refd = metaslab_class_get_alloc(spa_normal_class(spa));
3229 arg->value.off = refd / DEV_BSIZE;
3236 off_t *off = (off_t *)data;
3240 hole = (cmd == FIOSEEKHOLE);
3242 error = dmu_offset_next(zv->zv_objset, ZVOL_OBJ, hole, &noff);
3252 #endif /* illumos */