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 * Portions Copyright 2010 Robert Milkowski
26 * Copyright 2011 Nexenta Systems, Inc. All rights reserved.
27 * Copyright (c) 2012, 2014 by Delphix. All rights reserved.
28 * Copyright (c) 2013, Joyent, Inc. All rights reserved.
29 * Copyright (c) 2014 Integros [integros.com]
33 * ZFS volume emulation driver.
35 * Makes a DMU object look like a volume of arbitrary size, up to 2^64 bytes.
36 * Volumes are accessed through the symbolic links named:
38 * /dev/zvol/dsk/<pool_name>/<dataset_name>
39 * /dev/zvol/rdsk/<pool_name>/<dataset_name>
41 * These links are created by the /dev filesystem (sdev_zvolops.c).
42 * Volumes are persistent through reboot. No user command needs to be
43 * run before opening and using a device.
46 #include <sys/types.h>
47 #include <sys/param.h>
48 #include <sys/errno.h>
51 #include <sys/modctl.h>
55 #include <sys/cmn_err.h>
59 #include <sys/spa_impl.h>
61 #include <sys/dmu_traverse.h>
62 #include <sys/dnode.h>
63 #include <sys/dsl_dataset.h>
64 #include <sys/dsl_prop.h>
66 #include <sys/efi_partition.h>
67 #include <sys/byteorder.h>
68 #include <sys/pathname.h>
70 #include <sys/sunddi.h>
71 #include <sys/crc32.h>
72 #include <sys/dirent.h>
73 #include <sys/policy.h>
74 #include <sys/fs/zfs.h>
75 #include <sys/zfs_ioctl.h>
76 #include <sys/mkdev.h>
78 #include <sys/refcount.h>
79 #include <sys/zfs_znode.h>
80 #include <sys/zfs_rlock.h>
81 #include <sys/vdev_disk.h>
82 #include <sys/vdev_impl.h>
83 #include <sys/vdev_raidz.h>
85 #include <sys/dumphdr.h>
86 #include <sys/zil_impl.h>
88 #include <sys/dmu_tx.h>
89 #include <sys/zfeature.h>
90 #include <sys/zio_checksum.h>
92 #include "zfs_namecheck.h"
95 static char *zvol_tag
= "zvol_tag";
97 #define ZVOL_DUMPSIZE "dumpsize"
100 * This lock protects the zfsdev_state structure from being modified
101 * while it's being used, e.g. an open that comes in before a create
102 * finishes. It also protects temporary opens of the dataset so that,
103 * e.g., an open doesn't get a spurious EBUSY.
105 kmutex_t zfsdev_state_lock
;
106 static uint32_t zvol_minors
;
108 typedef struct zvol_extent
{
110 dva_t ze_dva
; /* dva associated with this extent */
111 uint64_t ze_nblks
; /* number of blocks in extent */
115 * The in-core state of each volume.
117 typedef struct zvol_state
{
118 char zv_name
[MAXPATHLEN
]; /* pool/dd name */
119 uint64_t zv_volsize
; /* amount of space we advertise */
120 uint64_t zv_volblocksize
; /* volume block size */
121 minor_t zv_minor
; /* minor number */
122 uint8_t zv_min_bs
; /* minimum addressable block shift */
123 uint8_t zv_flags
; /* readonly, dumpified, etc. */
124 objset_t
*zv_objset
; /* objset handle */
125 uint32_t zv_open_count
[OTYPCNT
]; /* open counts */
126 uint32_t zv_total_opens
; /* total open count */
127 zilog_t
*zv_zilog
; /* ZIL handle */
128 list_t zv_extents
; /* List of extents for dump */
129 znode_t zv_znode
; /* for range locking */
130 dmu_buf_t
*zv_dbuf
; /* bonus handle */
134 * zvol specific flags
136 #define ZVOL_RDONLY 0x1
137 #define ZVOL_DUMPIFIED 0x2
138 #define ZVOL_EXCL 0x4
142 * zvol maximum transfer in one DMU tx.
144 int zvol_maxphys
= DMU_MAX_ACCESS
/2;
147 * Toggle unmap functionality.
149 boolean_t zvol_unmap_enabled
= B_TRUE
;
151 extern int zfs_set_prop_nvlist(const char *, zprop_source_t
,
152 nvlist_t
*, nvlist_t
*);
153 static int zvol_remove_zv(zvol_state_t
*);
154 static int zvol_get_data(void *arg
, lr_write_t
*lr
, char *buf
, zio_t
*zio
);
155 static int zvol_dumpify(zvol_state_t
*zv
);
156 static int zvol_dump_fini(zvol_state_t
*zv
);
157 static int zvol_dump_init(zvol_state_t
*zv
, boolean_t resize
);
160 zvol_size_changed(zvol_state_t
*zv
, uint64_t volsize
)
162 dev_t dev
= makedevice(ddi_driver_major(zfs_dip
), zv
->zv_minor
);
164 zv
->zv_volsize
= volsize
;
165 VERIFY(ddi_prop_update_int64(dev
, zfs_dip
,
166 "Size", volsize
) == DDI_SUCCESS
);
167 VERIFY(ddi_prop_update_int64(dev
, zfs_dip
,
168 "Nblocks", lbtodb(volsize
)) == DDI_SUCCESS
);
170 /* Notify specfs to invalidate the cached size */
171 spec_size_invalidate(dev
, VBLK
);
172 spec_size_invalidate(dev
, VCHR
);
176 zvol_check_volsize(uint64_t volsize
, uint64_t blocksize
)
179 return (SET_ERROR(EINVAL
));
181 if (volsize
% blocksize
!= 0)
182 return (SET_ERROR(EINVAL
));
185 if (volsize
- 1 > SPEC_MAXOFFSET_T
)
186 return (SET_ERROR(EOVERFLOW
));
192 zvol_check_volblocksize(uint64_t volblocksize
)
194 if (volblocksize
< SPA_MINBLOCKSIZE
||
195 volblocksize
> SPA_OLD_MAXBLOCKSIZE
||
197 return (SET_ERROR(EDOM
));
203 zvol_get_stats(objset_t
*os
, nvlist_t
*nv
)
206 dmu_object_info_t doi
;
209 error
= zap_lookup(os
, ZVOL_ZAP_OBJ
, "size", 8, 1, &val
);
213 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_VOLSIZE
, val
);
215 error
= dmu_object_info(os
, ZVOL_OBJ
, &doi
);
218 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_VOLBLOCKSIZE
,
219 doi
.doi_data_block_size
);
225 static zvol_state_t
*
226 zvol_minor_lookup(const char *name
)
231 ASSERT(MUTEX_HELD(&zfsdev_state_lock
));
233 for (minor
= 1; minor
<= ZFSDEV_MAX_MINOR
; minor
++) {
234 zv
= zfsdev_get_soft_state(minor
, ZSST_ZVOL
);
237 if (strcmp(zv
->zv_name
, name
) == 0)
244 /* extent mapping arg */
252 zvol_map_block(spa_t
*spa
, zilog_t
*zilog
, const blkptr_t
*bp
,
253 const zbookmark_phys_t
*zb
, const dnode_phys_t
*dnp
, void *arg
)
255 struct maparg
*ma
= arg
;
257 int bs
= ma
->ma_zv
->zv_volblocksize
;
259 if (bp
== NULL
|| BP_IS_HOLE(bp
) ||
260 zb
->zb_object
!= ZVOL_OBJ
|| zb
->zb_level
!= 0)
263 VERIFY(!BP_IS_EMBEDDED(bp
));
265 VERIFY3U(ma
->ma_blks
, ==, zb
->zb_blkid
);
268 /* Abort immediately if we have encountered gang blocks */
270 return (SET_ERROR(EFRAGS
));
273 * See if the block is at the end of the previous extent.
275 ze
= list_tail(&ma
->ma_zv
->zv_extents
);
277 DVA_GET_VDEV(BP_IDENTITY(bp
)) == DVA_GET_VDEV(&ze
->ze_dva
) &&
278 DVA_GET_OFFSET(BP_IDENTITY(bp
)) ==
279 DVA_GET_OFFSET(&ze
->ze_dva
) + ze
->ze_nblks
* bs
) {
284 dprintf_bp(bp
, "%s", "next blkptr:");
286 /* start a new extent */
287 ze
= kmem_zalloc(sizeof (zvol_extent_t
), KM_SLEEP
);
288 ze
->ze_dva
= bp
->blk_dva
[0]; /* structure assignment */
290 list_insert_tail(&ma
->ma_zv
->zv_extents
, ze
);
295 zvol_free_extents(zvol_state_t
*zv
)
299 while (ze
= list_head(&zv
->zv_extents
)) {
300 list_remove(&zv
->zv_extents
, ze
);
301 kmem_free(ze
, sizeof (zvol_extent_t
));
306 zvol_get_lbas(zvol_state_t
*zv
)
308 objset_t
*os
= zv
->zv_objset
;
314 zvol_free_extents(zv
);
316 /* commit any in-flight changes before traversing the dataset */
317 txg_wait_synced(dmu_objset_pool(os
), 0);
318 err
= traverse_dataset(dmu_objset_ds(os
), 0,
319 TRAVERSE_PRE
| TRAVERSE_PREFETCH_METADATA
, zvol_map_block
, &ma
);
320 if (err
|| ma
.ma_blks
!= (zv
->zv_volsize
/ zv
->zv_volblocksize
)) {
321 zvol_free_extents(zv
);
322 return (err
? err
: EIO
);
330 zvol_create_cb(objset_t
*os
, void *arg
, cred_t
*cr
, dmu_tx_t
*tx
)
332 zfs_creat_t
*zct
= arg
;
333 nvlist_t
*nvprops
= zct
->zct_props
;
335 uint64_t volblocksize
, volsize
;
337 VERIFY(nvlist_lookup_uint64(nvprops
,
338 zfs_prop_to_name(ZFS_PROP_VOLSIZE
), &volsize
) == 0);
339 if (nvlist_lookup_uint64(nvprops
,
340 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE
), &volblocksize
) != 0)
341 volblocksize
= zfs_prop_default_numeric(ZFS_PROP_VOLBLOCKSIZE
);
344 * These properties must be removed from the list so the generic
345 * property setting step won't apply to them.
347 VERIFY(nvlist_remove_all(nvprops
,
348 zfs_prop_to_name(ZFS_PROP_VOLSIZE
)) == 0);
349 (void) nvlist_remove_all(nvprops
,
350 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE
));
352 error
= dmu_object_claim(os
, ZVOL_OBJ
, DMU_OT_ZVOL
, volblocksize
,
356 error
= zap_create_claim(os
, ZVOL_ZAP_OBJ
, DMU_OT_ZVOL_PROP
,
360 error
= zap_update(os
, ZVOL_ZAP_OBJ
, "size", 8, 1, &volsize
, tx
);
365 * Replay a TX_TRUNCATE ZIL transaction if asked. TX_TRUNCATE is how we
366 * implement DKIOCFREE/free-long-range.
369 zvol_replay_truncate(zvol_state_t
*zv
, lr_truncate_t
*lr
, boolean_t byteswap
)
371 uint64_t offset
, length
;
374 byteswap_uint64_array(lr
, sizeof (*lr
));
376 offset
= lr
->lr_offset
;
377 length
= lr
->lr_length
;
379 return (dmu_free_long_range(zv
->zv_objset
, ZVOL_OBJ
, offset
, length
));
383 * Replay a TX_WRITE ZIL transaction that didn't get committed
384 * after a system failure
387 zvol_replay_write(zvol_state_t
*zv
, lr_write_t
*lr
, boolean_t byteswap
)
389 objset_t
*os
= zv
->zv_objset
;
390 char *data
= (char *)(lr
+ 1); /* data follows lr_write_t */
391 uint64_t offset
, length
;
396 byteswap_uint64_array(lr
, sizeof (*lr
));
398 offset
= lr
->lr_offset
;
399 length
= lr
->lr_length
;
401 /* If it's a dmu_sync() block, write the whole block */
402 if (lr
->lr_common
.lrc_reclen
== sizeof (lr_write_t
)) {
403 uint64_t blocksize
= BP_GET_LSIZE(&lr
->lr_blkptr
);
404 if (length
< blocksize
) {
405 offset
-= offset
% blocksize
;
410 tx
= dmu_tx_create(os
);
411 dmu_tx_hold_write(tx
, ZVOL_OBJ
, offset
, length
);
412 error
= dmu_tx_assign(tx
, TXG_WAIT
);
416 dmu_write(os
, ZVOL_OBJ
, offset
, length
, data
, tx
);
425 zvol_replay_err(zvol_state_t
*zv
, lr_t
*lr
, boolean_t byteswap
)
427 return (SET_ERROR(ENOTSUP
));
431 * Callback vectors for replaying records.
432 * Only TX_WRITE and TX_TRUNCATE are needed for zvol.
434 zil_replay_func_t
*zvol_replay_vector
[TX_MAX_TYPE
] = {
435 zvol_replay_err
, /* 0 no such transaction type */
436 zvol_replay_err
, /* TX_CREATE */
437 zvol_replay_err
, /* TX_MKDIR */
438 zvol_replay_err
, /* TX_MKXATTR */
439 zvol_replay_err
, /* TX_SYMLINK */
440 zvol_replay_err
, /* TX_REMOVE */
441 zvol_replay_err
, /* TX_RMDIR */
442 zvol_replay_err
, /* TX_LINK */
443 zvol_replay_err
, /* TX_RENAME */
444 zvol_replay_write
, /* TX_WRITE */
445 zvol_replay_truncate
, /* TX_TRUNCATE */
446 zvol_replay_err
, /* TX_SETATTR */
447 zvol_replay_err
, /* TX_ACL */
448 zvol_replay_err
, /* TX_CREATE_ACL */
449 zvol_replay_err
, /* TX_CREATE_ATTR */
450 zvol_replay_err
, /* TX_CREATE_ACL_ATTR */
451 zvol_replay_err
, /* TX_MKDIR_ACL */
452 zvol_replay_err
, /* TX_MKDIR_ATTR */
453 zvol_replay_err
, /* TX_MKDIR_ACL_ATTR */
454 zvol_replay_err
, /* TX_WRITE2 */
458 zvol_name2minor(const char *name
, minor_t
*minor
)
462 mutex_enter(&zfsdev_state_lock
);
463 zv
= zvol_minor_lookup(name
);
465 *minor
= zv
->zv_minor
;
466 mutex_exit(&zfsdev_state_lock
);
467 return (zv
? 0 : -1);
471 * Create a minor node (plus a whole lot more) for the specified volume.
474 zvol_create_minor(const char *name
)
476 zfs_soft_state_t
*zs
;
479 dmu_object_info_t doi
;
481 char chrbuf
[30], blkbuf
[30];
484 mutex_enter(&zfsdev_state_lock
);
486 if (zvol_minor_lookup(name
) != NULL
) {
487 mutex_exit(&zfsdev_state_lock
);
488 return (SET_ERROR(EEXIST
));
491 /* lie and say we're read-only */
492 error
= dmu_objset_own(name
, DMU_OST_ZVOL
, B_TRUE
, FTAG
, &os
);
495 mutex_exit(&zfsdev_state_lock
);
499 if ((minor
= zfsdev_minor_alloc()) == 0) {
500 dmu_objset_disown(os
, FTAG
);
501 mutex_exit(&zfsdev_state_lock
);
502 return (SET_ERROR(ENXIO
));
505 if (ddi_soft_state_zalloc(zfsdev_state
, minor
) != DDI_SUCCESS
) {
506 dmu_objset_disown(os
, FTAG
);
507 mutex_exit(&zfsdev_state_lock
);
508 return (SET_ERROR(EAGAIN
));
510 (void) ddi_prop_update_string(minor
, zfs_dip
, ZVOL_PROP_NAME
,
513 (void) snprintf(chrbuf
, sizeof (chrbuf
), "%u,raw", minor
);
515 if (ddi_create_minor_node(zfs_dip
, chrbuf
, S_IFCHR
,
516 minor
, DDI_PSEUDO
, 0) == DDI_FAILURE
) {
517 ddi_soft_state_free(zfsdev_state
, minor
);
518 dmu_objset_disown(os
, FTAG
);
519 mutex_exit(&zfsdev_state_lock
);
520 return (SET_ERROR(EAGAIN
));
523 (void) snprintf(blkbuf
, sizeof (blkbuf
), "%u", minor
);
525 if (ddi_create_minor_node(zfs_dip
, blkbuf
, S_IFBLK
,
526 minor
, DDI_PSEUDO
, 0) == DDI_FAILURE
) {
527 ddi_remove_minor_node(zfs_dip
, chrbuf
);
528 ddi_soft_state_free(zfsdev_state
, minor
);
529 dmu_objset_disown(os
, FTAG
);
530 mutex_exit(&zfsdev_state_lock
);
531 return (SET_ERROR(EAGAIN
));
534 zs
= ddi_get_soft_state(zfsdev_state
, minor
);
535 zs
->zss_type
= ZSST_ZVOL
;
536 zv
= zs
->zss_data
= kmem_zalloc(sizeof (zvol_state_t
), KM_SLEEP
);
537 (void) strlcpy(zv
->zv_name
, name
, MAXPATHLEN
);
538 zv
->zv_min_bs
= DEV_BSHIFT
;
539 zv
->zv_minor
= minor
;
541 if (dmu_objset_is_snapshot(os
) || !spa_writeable(dmu_objset_spa(os
)))
542 zv
->zv_flags
|= ZVOL_RDONLY
;
543 mutex_init(&zv
->zv_znode
.z_range_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
544 avl_create(&zv
->zv_znode
.z_range_avl
, zfs_range_compare
,
545 sizeof (rl_t
), offsetof(rl_t
, r_node
));
546 list_create(&zv
->zv_extents
, sizeof (zvol_extent_t
),
547 offsetof(zvol_extent_t
, ze_node
));
548 /* get and cache the blocksize */
549 error
= dmu_object_info(os
, ZVOL_OBJ
, &doi
);
551 zv
->zv_volblocksize
= doi
.doi_data_block_size
;
553 if (spa_writeable(dmu_objset_spa(os
))) {
554 if (zil_replay_disable
)
555 zil_destroy(dmu_objset_zil(os
), B_FALSE
);
557 zil_replay(os
, zv
, zvol_replay_vector
);
559 dmu_objset_disown(os
, FTAG
);
560 zv
->zv_objset
= NULL
;
564 mutex_exit(&zfsdev_state_lock
);
570 * Remove minor node for the specified volume.
573 zvol_remove_zv(zvol_state_t
*zv
)
576 minor_t minor
= zv
->zv_minor
;
578 ASSERT(MUTEX_HELD(&zfsdev_state_lock
));
579 if (zv
->zv_total_opens
!= 0)
580 return (SET_ERROR(EBUSY
));
582 (void) snprintf(nmbuf
, sizeof (nmbuf
), "%u,raw", minor
);
583 ddi_remove_minor_node(zfs_dip
, nmbuf
);
585 (void) snprintf(nmbuf
, sizeof (nmbuf
), "%u", minor
);
586 ddi_remove_minor_node(zfs_dip
, nmbuf
);
588 avl_destroy(&zv
->zv_znode
.z_range_avl
);
589 mutex_destroy(&zv
->zv_znode
.z_range_lock
);
591 kmem_free(zv
, sizeof (zvol_state_t
));
593 ddi_soft_state_free(zfsdev_state
, minor
);
600 zvol_remove_minor(const char *name
)
605 mutex_enter(&zfsdev_state_lock
);
606 if ((zv
= zvol_minor_lookup(name
)) == NULL
) {
607 mutex_exit(&zfsdev_state_lock
);
608 return (SET_ERROR(ENXIO
));
610 rc
= zvol_remove_zv(zv
);
611 mutex_exit(&zfsdev_state_lock
);
616 zvol_first_open(zvol_state_t
*zv
)
623 /* lie and say we're read-only */
624 error
= dmu_objset_own(zv
->zv_name
, DMU_OST_ZVOL
, B_TRUE
,
630 error
= zap_lookup(os
, ZVOL_ZAP_OBJ
, "size", 8, 1, &volsize
);
633 dmu_objset_disown(os
, zvol_tag
);
637 error
= dmu_bonus_hold(os
, ZVOL_OBJ
, zvol_tag
, &zv
->zv_dbuf
);
639 dmu_objset_disown(os
, zvol_tag
);
643 zvol_size_changed(zv
, volsize
);
644 zv
->zv_zilog
= zil_open(os
, zvol_get_data
);
646 VERIFY(dsl_prop_get_integer(zv
->zv_name
, "readonly", &readonly
,
648 if (readonly
|| dmu_objset_is_snapshot(os
) ||
649 !spa_writeable(dmu_objset_spa(os
)))
650 zv
->zv_flags
|= ZVOL_RDONLY
;
652 zv
->zv_flags
&= ~ZVOL_RDONLY
;
657 zvol_last_close(zvol_state_t
*zv
)
659 zil_close(zv
->zv_zilog
);
662 dmu_buf_rele(zv
->zv_dbuf
, zvol_tag
);
668 if (dsl_dataset_is_dirty(dmu_objset_ds(zv
->zv_objset
)) &&
669 !(zv
->zv_flags
& ZVOL_RDONLY
))
670 txg_wait_synced(dmu_objset_pool(zv
->zv_objset
), 0);
671 dmu_objset_evict_dbufs(zv
->zv_objset
);
673 dmu_objset_disown(zv
->zv_objset
, zvol_tag
);
674 zv
->zv_objset
= NULL
;
678 zvol_prealloc(zvol_state_t
*zv
)
680 objset_t
*os
= zv
->zv_objset
;
682 uint64_t refd
, avail
, usedobjs
, availobjs
;
683 uint64_t resid
= zv
->zv_volsize
;
686 /* Check the space usage before attempting to allocate the space */
687 dmu_objset_space(os
, &refd
, &avail
, &usedobjs
, &availobjs
);
688 if (avail
< zv
->zv_volsize
)
689 return (SET_ERROR(ENOSPC
));
691 /* Free old extents if they exist */
692 zvol_free_extents(zv
);
696 uint64_t bytes
= MIN(resid
, SPA_OLD_MAXBLOCKSIZE
);
698 tx
= dmu_tx_create(os
);
699 dmu_tx_hold_write(tx
, ZVOL_OBJ
, off
, bytes
);
700 error
= dmu_tx_assign(tx
, TXG_WAIT
);
703 (void) dmu_free_long_range(os
, ZVOL_OBJ
, 0, off
);
706 dmu_prealloc(os
, ZVOL_OBJ
, off
, bytes
, tx
);
711 txg_wait_synced(dmu_objset_pool(os
), 0);
717 zvol_update_volsize(objset_t
*os
, uint64_t volsize
)
722 ASSERT(MUTEX_HELD(&zfsdev_state_lock
));
724 tx
= dmu_tx_create(os
);
725 dmu_tx_hold_zap(tx
, ZVOL_ZAP_OBJ
, TRUE
, NULL
);
726 dmu_tx_mark_netfree(tx
);
727 error
= dmu_tx_assign(tx
, TXG_WAIT
);
733 error
= zap_update(os
, ZVOL_ZAP_OBJ
, "size", 8, 1,
738 error
= dmu_free_long_range(os
,
739 ZVOL_OBJ
, volsize
, DMU_OBJECT_END
);
744 zvol_remove_minors(const char *name
)
750 namebuf
= kmem_zalloc(strlen(name
) + 2, KM_SLEEP
);
751 (void) strncpy(namebuf
, name
, strlen(name
));
752 (void) strcat(namebuf
, "/");
753 mutex_enter(&zfsdev_state_lock
);
754 for (minor
= 1; minor
<= ZFSDEV_MAX_MINOR
; minor
++) {
756 zv
= zfsdev_get_soft_state(minor
, ZSST_ZVOL
);
759 if (strncmp(namebuf
, zv
->zv_name
, strlen(namebuf
)) == 0)
760 (void) zvol_remove_zv(zv
);
762 kmem_free(namebuf
, strlen(name
) + 2);
764 mutex_exit(&zfsdev_state_lock
);
768 zvol_update_live_volsize(zvol_state_t
*zv
, uint64_t volsize
)
770 uint64_t old_volsize
= 0ULL;
773 ASSERT(MUTEX_HELD(&zfsdev_state_lock
));
776 * Reinitialize the dump area to the new size. If we
777 * failed to resize the dump area then restore it back to
778 * its original size. We must set the new volsize prior
779 * to calling dumpvp_resize() to ensure that the devices'
780 * size(9P) is not visible by the dump subsystem.
782 old_volsize
= zv
->zv_volsize
;
783 zvol_size_changed(zv
, volsize
);
785 if (zv
->zv_flags
& ZVOL_DUMPIFIED
) {
786 if ((error
= zvol_dumpify(zv
)) != 0 ||
787 (error
= dumpvp_resize()) != 0) {
790 (void) zvol_update_volsize(zv
->zv_objset
, old_volsize
);
791 zvol_size_changed(zv
, old_volsize
);
792 dumpify_error
= zvol_dumpify(zv
);
793 error
= dumpify_error
? dumpify_error
: error
;
798 * Generate a LUN expansion event.
803 char *physpath
= kmem_zalloc(MAXPATHLEN
, KM_SLEEP
);
805 (void) snprintf(physpath
, MAXPATHLEN
, "%s%u", ZVOL_PSEUDO_DEV
,
808 VERIFY(nvlist_alloc(&attr
, NV_UNIQUE_NAME
, KM_SLEEP
) == 0);
809 VERIFY(nvlist_add_string(attr
, DEV_PHYS_PATH
, physpath
) == 0);
811 (void) ddi_log_sysevent(zfs_dip
, SUNW_VENDOR
, EC_DEV_STATUS
,
812 ESC_DEV_DLE
, attr
, &eid
, DDI_SLEEP
);
815 kmem_free(physpath
, MAXPATHLEN
);
821 zvol_set_volsize(const char *name
, uint64_t volsize
)
823 zvol_state_t
*zv
= NULL
;
826 dmu_object_info_t doi
;
828 boolean_t owned
= B_FALSE
;
830 error
= dsl_prop_get_integer(name
,
831 zfs_prop_to_name(ZFS_PROP_READONLY
), &readonly
, NULL
);
835 return (SET_ERROR(EROFS
));
837 mutex_enter(&zfsdev_state_lock
);
838 zv
= zvol_minor_lookup(name
);
840 if (zv
== NULL
|| zv
->zv_objset
== NULL
) {
841 if ((error
= dmu_objset_own(name
, DMU_OST_ZVOL
, B_FALSE
,
843 mutex_exit(&zfsdev_state_lock
);
853 if ((error
= dmu_object_info(os
, ZVOL_OBJ
, &doi
)) != 0 ||
854 (error
= zvol_check_volsize(volsize
, doi
.doi_data_block_size
)) != 0)
857 error
= zvol_update_volsize(os
, volsize
);
859 if (error
== 0 && zv
!= NULL
)
860 error
= zvol_update_live_volsize(zv
, volsize
);
863 dmu_objset_disown(os
, FTAG
);
865 zv
->zv_objset
= NULL
;
867 mutex_exit(&zfsdev_state_lock
);
873 zvol_open(dev_t
*devp
, int flag
, int otyp
, cred_t
*cr
)
878 mutex_enter(&zfsdev_state_lock
);
880 zv
= zfsdev_get_soft_state(getminor(*devp
), ZSST_ZVOL
);
882 mutex_exit(&zfsdev_state_lock
);
883 return (SET_ERROR(ENXIO
));
886 if (zv
->zv_total_opens
== 0)
887 err
= zvol_first_open(zv
);
889 mutex_exit(&zfsdev_state_lock
);
892 if ((flag
& FWRITE
) && (zv
->zv_flags
& ZVOL_RDONLY
)) {
893 err
= SET_ERROR(EROFS
);
896 if (zv
->zv_flags
& ZVOL_EXCL
) {
897 err
= SET_ERROR(EBUSY
);
901 if (zv
->zv_total_opens
!= 0) {
902 err
= SET_ERROR(EBUSY
);
905 zv
->zv_flags
|= ZVOL_EXCL
;
908 if (zv
->zv_open_count
[otyp
] == 0 || otyp
== OTYP_LYR
) {
909 zv
->zv_open_count
[otyp
]++;
910 zv
->zv_total_opens
++;
912 mutex_exit(&zfsdev_state_lock
);
916 if (zv
->zv_total_opens
== 0)
918 mutex_exit(&zfsdev_state_lock
);
924 zvol_close(dev_t dev
, int flag
, int otyp
, cred_t
*cr
)
926 minor_t minor
= getminor(dev
);
930 mutex_enter(&zfsdev_state_lock
);
932 zv
= zfsdev_get_soft_state(minor
, ZSST_ZVOL
);
934 mutex_exit(&zfsdev_state_lock
);
935 return (SET_ERROR(ENXIO
));
938 if (zv
->zv_flags
& ZVOL_EXCL
) {
939 ASSERT(zv
->zv_total_opens
== 1);
940 zv
->zv_flags
&= ~ZVOL_EXCL
;
944 * If the open count is zero, this is a spurious close.
945 * That indicates a bug in the kernel / DDI framework.
947 ASSERT(zv
->zv_open_count
[otyp
] != 0);
948 ASSERT(zv
->zv_total_opens
!= 0);
951 * You may get multiple opens, but only one close.
953 zv
->zv_open_count
[otyp
]--;
954 zv
->zv_total_opens
--;
956 if (zv
->zv_total_opens
== 0)
959 mutex_exit(&zfsdev_state_lock
);
964 zvol_get_done(zgd_t
*zgd
, int error
)
967 dmu_buf_rele(zgd
->zgd_db
, zgd
);
969 zfs_range_unlock(zgd
->zgd_rl
);
971 if (error
== 0 && zgd
->zgd_bp
)
972 zil_add_block(zgd
->zgd_zilog
, zgd
->zgd_bp
);
974 kmem_free(zgd
, sizeof (zgd_t
));
978 * Get data to generate a TX_WRITE intent log record.
981 zvol_get_data(void *arg
, lr_write_t
*lr
, char *buf
, zio_t
*zio
)
983 zvol_state_t
*zv
= arg
;
984 objset_t
*os
= zv
->zv_objset
;
985 uint64_t object
= ZVOL_OBJ
;
986 uint64_t offset
= lr
->lr_offset
;
987 uint64_t size
= lr
->lr_length
; /* length of user data */
988 blkptr_t
*bp
= &lr
->lr_blkptr
;
996 zgd
= kmem_zalloc(sizeof (zgd_t
), KM_SLEEP
);
997 zgd
->zgd_zilog
= zv
->zv_zilog
;
998 zgd
->zgd_rl
= zfs_range_lock(&zv
->zv_znode
, offset
, size
, RL_READER
);
1001 * Write records come in two flavors: immediate and indirect.
1002 * For small writes it's cheaper to store the data with the
1003 * log record (immediate); for large writes it's cheaper to
1004 * sync the data and get a pointer to it (indirect) so that
1005 * we don't have to write the data twice.
1007 if (buf
!= NULL
) { /* immediate write */
1008 error
= dmu_read(os
, object
, offset
, size
, buf
,
1009 DMU_READ_NO_PREFETCH
);
1011 size
= zv
->zv_volblocksize
;
1012 offset
= P2ALIGN(offset
, size
);
1013 error
= dmu_buf_hold(os
, object
, offset
, zgd
, &db
,
1014 DMU_READ_NO_PREFETCH
);
1016 blkptr_t
*obp
= dmu_buf_get_blkptr(db
);
1018 ASSERT(BP_IS_HOLE(bp
));
1025 ASSERT(db
->db_offset
== offset
);
1026 ASSERT(db
->db_size
== size
);
1028 error
= dmu_sync(zio
, lr
->lr_common
.lrc_txg
,
1029 zvol_get_done
, zgd
);
1036 zvol_get_done(zgd
, error
);
1042 * zvol_log_write() handles synchronous writes using TX_WRITE ZIL transactions.
1044 * We store data in the log buffers if it's small enough.
1045 * Otherwise we will later flush the data out via dmu_sync().
1047 ssize_t zvol_immediate_write_sz
= 32768;
1050 zvol_log_write(zvol_state_t
*zv
, dmu_tx_t
*tx
, offset_t off
, ssize_t resid
,
1053 uint32_t blocksize
= zv
->zv_volblocksize
;
1054 zilog_t
*zilog
= zv
->zv_zilog
;
1056 ssize_t immediate_write_sz
;
1058 if (zil_replaying(zilog
, tx
))
1061 immediate_write_sz
= (zilog
->zl_logbias
== ZFS_LOGBIAS_THROUGHPUT
)
1062 ? 0 : zvol_immediate_write_sz
;
1064 slogging
= spa_has_slogs(zilog
->zl_spa
) &&
1065 (zilog
->zl_logbias
== ZFS_LOGBIAS_LATENCY
);
1071 itx_wr_state_t write_state
;
1074 * Unlike zfs_log_write() we can be called with
1075 * upto DMU_MAX_ACCESS/2 (5MB) writes.
1077 if (blocksize
> immediate_write_sz
&& !slogging
&&
1078 resid
>= blocksize
&& off
% blocksize
== 0) {
1079 write_state
= WR_INDIRECT
; /* uses dmu_sync */
1082 write_state
= WR_COPIED
;
1083 len
= MIN(ZIL_MAX_LOG_DATA
, resid
);
1085 write_state
= WR_NEED_COPY
;
1086 len
= MIN(ZIL_MAX_LOG_DATA
, resid
);
1089 itx
= zil_itx_create(TX_WRITE
, sizeof (*lr
) +
1090 (write_state
== WR_COPIED
? len
: 0));
1091 lr
= (lr_write_t
*)&itx
->itx_lr
;
1092 if (write_state
== WR_COPIED
&& dmu_read(zv
->zv_objset
,
1093 ZVOL_OBJ
, off
, len
, lr
+ 1, DMU_READ_NO_PREFETCH
) != 0) {
1094 zil_itx_destroy(itx
);
1095 itx
= zil_itx_create(TX_WRITE
, sizeof (*lr
));
1096 lr
= (lr_write_t
*)&itx
->itx_lr
;
1097 write_state
= WR_NEED_COPY
;
1100 itx
->itx_wr_state
= write_state
;
1101 if (write_state
== WR_NEED_COPY
)
1102 itx
->itx_sod
+= len
;
1103 lr
->lr_foid
= ZVOL_OBJ
;
1104 lr
->lr_offset
= off
;
1105 lr
->lr_length
= len
;
1107 BP_ZERO(&lr
->lr_blkptr
);
1109 itx
->itx_private
= zv
;
1110 itx
->itx_sync
= sync
;
1112 zil_itx_assign(zilog
, itx
, tx
);
1120 zvol_dumpio_vdev(vdev_t
*vd
, void *addr
, uint64_t offset
, uint64_t origoffset
,
1121 uint64_t size
, boolean_t doread
, boolean_t isdump
)
1127 if (vd
->vdev_ops
== &vdev_mirror_ops
||
1128 vd
->vdev_ops
== &vdev_replacing_ops
||
1129 vd
->vdev_ops
== &vdev_spare_ops
) {
1130 for (c
= 0; c
< vd
->vdev_children
; c
++) {
1131 int err
= zvol_dumpio_vdev(vd
->vdev_child
[c
],
1132 addr
, offset
, origoffset
, size
, doread
, isdump
);
1135 } else if (doread
) {
1141 if (!vd
->vdev_ops
->vdev_op_leaf
&& vd
->vdev_ops
!= &vdev_raidz_ops
)
1142 return (numerrors
< vd
->vdev_children
? 0 : EIO
);
1144 if (doread
&& !vdev_readable(vd
))
1145 return (SET_ERROR(EIO
));
1146 else if (!doread
&& !vdev_writeable(vd
))
1147 return (SET_ERROR(EIO
));
1149 if (vd
->vdev_ops
== &vdev_raidz_ops
) {
1150 return (vdev_raidz_physio(vd
,
1151 addr
, size
, offset
, origoffset
, doread
, isdump
));
1154 offset
+= VDEV_LABEL_START_SIZE
;
1156 if (ddi_in_panic() || isdump
) {
1159 return (SET_ERROR(EIO
));
1161 ASSERT3P(dvd
, !=, NULL
);
1162 return (ldi_dump(dvd
->vd_lh
, addr
, lbtodb(offset
),
1166 ASSERT3P(dvd
, !=, NULL
);
1167 return (vdev_disk_ldi_physio(dvd
->vd_lh
, addr
, size
,
1168 offset
, doread
? B_READ
: B_WRITE
));
1173 zvol_dumpio(zvol_state_t
*zv
, void *addr
, uint64_t offset
, uint64_t size
,
1174 boolean_t doread
, boolean_t isdump
)
1179 spa_t
*spa
= dmu_objset_spa(zv
->zv_objset
);
1181 /* Must be sector aligned, and not stradle a block boundary. */
1182 if (P2PHASE(offset
, DEV_BSIZE
) || P2PHASE(size
, DEV_BSIZE
) ||
1183 P2BOUNDARY(offset
, size
, zv
->zv_volblocksize
)) {
1184 return (SET_ERROR(EINVAL
));
1186 ASSERT(size
<= zv
->zv_volblocksize
);
1188 /* Locate the extent this belongs to */
1189 ze
= list_head(&zv
->zv_extents
);
1190 while (offset
>= ze
->ze_nblks
* zv
->zv_volblocksize
) {
1191 offset
-= ze
->ze_nblks
* zv
->zv_volblocksize
;
1192 ze
= list_next(&zv
->zv_extents
, ze
);
1196 return (SET_ERROR(EINVAL
));
1198 if (!ddi_in_panic())
1199 spa_config_enter(spa
, SCL_STATE
, FTAG
, RW_READER
);
1201 vd
= vdev_lookup_top(spa
, DVA_GET_VDEV(&ze
->ze_dva
));
1202 offset
+= DVA_GET_OFFSET(&ze
->ze_dva
);
1203 error
= zvol_dumpio_vdev(vd
, addr
, offset
, DVA_GET_OFFSET(&ze
->ze_dva
),
1204 size
, doread
, isdump
);
1206 if (!ddi_in_panic())
1207 spa_config_exit(spa
, SCL_STATE
, FTAG
);
1213 zvol_strategy(buf_t
*bp
)
1215 zfs_soft_state_t
*zs
= NULL
;
1217 uint64_t off
, volsize
;
1223 boolean_t doread
= bp
->b_flags
& B_READ
;
1224 boolean_t is_dumpified
;
1227 if (getminor(bp
->b_edev
) == 0) {
1228 error
= SET_ERROR(EINVAL
);
1230 zs
= ddi_get_soft_state(zfsdev_state
, getminor(bp
->b_edev
));
1232 error
= SET_ERROR(ENXIO
);
1233 else if (zs
->zss_type
!= ZSST_ZVOL
)
1234 error
= SET_ERROR(EINVAL
);
1238 bioerror(bp
, error
);
1245 if (!(bp
->b_flags
& B_READ
) && (zv
->zv_flags
& ZVOL_RDONLY
)) {
1246 bioerror(bp
, EROFS
);
1251 off
= ldbtob(bp
->b_blkno
);
1252 volsize
= zv
->zv_volsize
;
1258 addr
= bp
->b_un
.b_addr
;
1259 resid
= bp
->b_bcount
;
1261 if (resid
> 0 && (off
< 0 || off
>= volsize
)) {
1267 is_dumpified
= zv
->zv_flags
& ZVOL_DUMPIFIED
;
1268 sync
= ((!(bp
->b_flags
& B_ASYNC
) &&
1269 !(zv
->zv_flags
& ZVOL_WCE
)) ||
1270 (zv
->zv_objset
->os_sync
== ZFS_SYNC_ALWAYS
)) &&
1271 !doread
&& !is_dumpified
;
1274 * There must be no buffer changes when doing a dmu_sync() because
1275 * we can't change the data whilst calculating the checksum.
1277 rl
= zfs_range_lock(&zv
->zv_znode
, off
, resid
,
1278 doread
? RL_READER
: RL_WRITER
);
1280 while (resid
!= 0 && off
< volsize
) {
1281 size_t size
= MIN(resid
, zvol_maxphys
);
1283 size
= MIN(size
, P2END(off
, zv
->zv_volblocksize
) - off
);
1284 error
= zvol_dumpio(zv
, addr
, off
, size
,
1286 } else if (doread
) {
1287 error
= dmu_read(os
, ZVOL_OBJ
, off
, size
, addr
,
1290 dmu_tx_t
*tx
= dmu_tx_create(os
);
1291 dmu_tx_hold_write(tx
, ZVOL_OBJ
, off
, size
);
1292 error
= dmu_tx_assign(tx
, TXG_WAIT
);
1296 dmu_write(os
, ZVOL_OBJ
, off
, size
, addr
, tx
);
1297 zvol_log_write(zv
, tx
, off
, size
, sync
);
1302 /* convert checksum errors into IO errors */
1303 if (error
== ECKSUM
)
1304 error
= SET_ERROR(EIO
);
1311 zfs_range_unlock(rl
);
1313 if ((bp
->b_resid
= resid
) == bp
->b_bcount
)
1314 bioerror(bp
, off
> volsize
? EINVAL
: error
);
1317 zil_commit(zv
->zv_zilog
, ZVOL_OBJ
);
1324 * Set the buffer count to the zvol maximum transfer.
1325 * Using our own routine instead of the default minphys()
1326 * means that for larger writes we write bigger buffers on X86
1327 * (128K instead of 56K) and flush the disk write cache less often
1328 * (every zvol_maxphys - currently 1MB) instead of minphys (currently
1329 * 56K on X86 and 128K on sparc).
1332 zvol_minphys(struct buf
*bp
)
1334 if (bp
->b_bcount
> zvol_maxphys
)
1335 bp
->b_bcount
= zvol_maxphys
;
1339 zvol_dump(dev_t dev
, caddr_t addr
, daddr_t blkno
, int nblocks
)
1341 minor_t minor
= getminor(dev
);
1348 zv
= zfsdev_get_soft_state(minor
, ZSST_ZVOL
);
1350 return (SET_ERROR(ENXIO
));
1352 if ((zv
->zv_flags
& ZVOL_DUMPIFIED
) == 0)
1353 return (SET_ERROR(EINVAL
));
1355 boff
= ldbtob(blkno
);
1356 resid
= ldbtob(nblocks
);
1358 VERIFY3U(boff
+ resid
, <=, zv
->zv_volsize
);
1361 size
= MIN(resid
, P2END(boff
, zv
->zv_volblocksize
) - boff
);
1362 error
= zvol_dumpio(zv
, addr
, boff
, size
, B_FALSE
, B_TRUE
);
1375 zvol_read(dev_t dev
, uio_t
*uio
, cred_t
*cr
)
1377 minor_t minor
= getminor(dev
);
1383 zv
= zfsdev_get_soft_state(minor
, ZSST_ZVOL
);
1385 return (SET_ERROR(ENXIO
));
1387 volsize
= zv
->zv_volsize
;
1388 if (uio
->uio_resid
> 0 &&
1389 (uio
->uio_loffset
< 0 || uio
->uio_loffset
>= volsize
))
1390 return (SET_ERROR(EIO
));
1392 if (zv
->zv_flags
& ZVOL_DUMPIFIED
) {
1393 error
= physio(zvol_strategy
, NULL
, dev
, B_READ
,
1398 rl
= zfs_range_lock(&zv
->zv_znode
, uio
->uio_loffset
, uio
->uio_resid
,
1400 while (uio
->uio_resid
> 0 && uio
->uio_loffset
< volsize
) {
1401 uint64_t bytes
= MIN(uio
->uio_resid
, DMU_MAX_ACCESS
>> 1);
1403 /* don't read past the end */
1404 if (bytes
> volsize
- uio
->uio_loffset
)
1405 bytes
= volsize
- uio
->uio_loffset
;
1407 error
= dmu_read_uio(zv
->zv_objset
, ZVOL_OBJ
, uio
, bytes
);
1409 /* convert checksum errors into IO errors */
1410 if (error
== ECKSUM
)
1411 error
= SET_ERROR(EIO
);
1415 zfs_range_unlock(rl
);
1421 zvol_write(dev_t dev
, uio_t
*uio
, cred_t
*cr
)
1423 minor_t minor
= getminor(dev
);
1430 zv
= zfsdev_get_soft_state(minor
, ZSST_ZVOL
);
1432 return (SET_ERROR(ENXIO
));
1434 volsize
= zv
->zv_volsize
;
1435 if (uio
->uio_resid
> 0 &&
1436 (uio
->uio_loffset
< 0 || uio
->uio_loffset
>= volsize
))
1437 return (SET_ERROR(EIO
));
1439 if (zv
->zv_flags
& ZVOL_DUMPIFIED
) {
1440 error
= physio(zvol_strategy
, NULL
, dev
, B_WRITE
,
1445 sync
= !(zv
->zv_flags
& ZVOL_WCE
) ||
1446 (zv
->zv_objset
->os_sync
== ZFS_SYNC_ALWAYS
);
1448 rl
= zfs_range_lock(&zv
->zv_znode
, uio
->uio_loffset
, uio
->uio_resid
,
1450 while (uio
->uio_resid
> 0 && uio
->uio_loffset
< volsize
) {
1451 uint64_t bytes
= MIN(uio
->uio_resid
, DMU_MAX_ACCESS
>> 1);
1452 uint64_t off
= uio
->uio_loffset
;
1453 dmu_tx_t
*tx
= dmu_tx_create(zv
->zv_objset
);
1455 if (bytes
> volsize
- off
) /* don't write past the end */
1456 bytes
= volsize
- off
;
1458 dmu_tx_hold_write(tx
, ZVOL_OBJ
, off
, bytes
);
1459 error
= dmu_tx_assign(tx
, TXG_WAIT
);
1464 error
= dmu_write_uio_dbuf(zv
->zv_dbuf
, uio
, bytes
, tx
);
1466 zvol_log_write(zv
, tx
, off
, bytes
, sync
);
1472 zfs_range_unlock(rl
);
1474 zil_commit(zv
->zv_zilog
, ZVOL_OBJ
);
1479 zvol_getefi(void *arg
, int flag
, uint64_t vs
, uint8_t bs
)
1481 struct uuid uuid
= EFI_RESERVED
;
1482 efi_gpe_t gpe
= { 0 };
1488 if (ddi_copyin(arg
, &efi
, sizeof (dk_efi_t
), flag
))
1489 return (SET_ERROR(EFAULT
));
1490 ptr
= (char *)(uintptr_t)efi
.dki_data_64
;
1491 length
= efi
.dki_length
;
1493 * Some clients may attempt to request a PMBR for the
1494 * zvol. Currently this interface will return EINVAL to
1495 * such requests. These requests could be supported by
1496 * adding a check for lba == 0 and consing up an appropriate
1499 if (efi
.dki_lba
< 1 || efi
.dki_lba
> 2 || length
<= 0)
1500 return (SET_ERROR(EINVAL
));
1502 gpe
.efi_gpe_StartingLBA
= LE_64(34ULL);
1503 gpe
.efi_gpe_EndingLBA
= LE_64((vs
>> bs
) - 1);
1504 UUID_LE_CONVERT(gpe
.efi_gpe_PartitionTypeGUID
, uuid
);
1506 if (efi
.dki_lba
== 1) {
1507 efi_gpt_t gpt
= { 0 };
1509 gpt
.efi_gpt_Signature
= LE_64(EFI_SIGNATURE
);
1510 gpt
.efi_gpt_Revision
= LE_32(EFI_VERSION_CURRENT
);
1511 gpt
.efi_gpt_HeaderSize
= LE_32(sizeof (gpt
));
1512 gpt
.efi_gpt_MyLBA
= LE_64(1ULL);
1513 gpt
.efi_gpt_FirstUsableLBA
= LE_64(34ULL);
1514 gpt
.efi_gpt_LastUsableLBA
= LE_64((vs
>> bs
) - 1);
1515 gpt
.efi_gpt_PartitionEntryLBA
= LE_64(2ULL);
1516 gpt
.efi_gpt_NumberOfPartitionEntries
= LE_32(1);
1517 gpt
.efi_gpt_SizeOfPartitionEntry
=
1518 LE_32(sizeof (efi_gpe_t
));
1519 CRC32(crc
, &gpe
, sizeof (gpe
), -1U, crc32_table
);
1520 gpt
.efi_gpt_PartitionEntryArrayCRC32
= LE_32(~crc
);
1521 CRC32(crc
, &gpt
, sizeof (gpt
), -1U, crc32_table
);
1522 gpt
.efi_gpt_HeaderCRC32
= LE_32(~crc
);
1523 if (ddi_copyout(&gpt
, ptr
, MIN(sizeof (gpt
), length
),
1525 return (SET_ERROR(EFAULT
));
1526 ptr
+= sizeof (gpt
);
1527 length
-= sizeof (gpt
);
1529 if (length
> 0 && ddi_copyout(&gpe
, ptr
, MIN(sizeof (gpe
),
1531 return (SET_ERROR(EFAULT
));
1536 * BEGIN entry points to allow external callers access to the volume.
1539 * Return the volume parameters needed for access from an external caller.
1540 * These values are invariant as long as the volume is held open.
1543 zvol_get_volume_params(minor_t minor
, uint64_t *blksize
,
1544 uint64_t *max_xfer_len
, void **minor_hdl
, void **objset_hdl
, void **zil_hdl
,
1545 void **rl_hdl
, void **bonus_hdl
)
1549 zv
= zfsdev_get_soft_state(minor
, ZSST_ZVOL
);
1551 return (SET_ERROR(ENXIO
));
1552 if (zv
->zv_flags
& ZVOL_DUMPIFIED
)
1553 return (SET_ERROR(ENXIO
));
1555 ASSERT(blksize
&& max_xfer_len
&& minor_hdl
&&
1556 objset_hdl
&& zil_hdl
&& rl_hdl
&& bonus_hdl
);
1558 *blksize
= zv
->zv_volblocksize
;
1559 *max_xfer_len
= (uint64_t)zvol_maxphys
;
1561 *objset_hdl
= zv
->zv_objset
;
1562 *zil_hdl
= zv
->zv_zilog
;
1563 *rl_hdl
= &zv
->zv_znode
;
1564 *bonus_hdl
= zv
->zv_dbuf
;
1569 * Return the current volume size to an external caller.
1570 * The size can change while the volume is open.
1573 zvol_get_volume_size(void *minor_hdl
)
1575 zvol_state_t
*zv
= minor_hdl
;
1577 return (zv
->zv_volsize
);
1581 * Return the current WCE setting to an external caller.
1582 * The WCE setting can change while the volume is open.
1585 zvol_get_volume_wce(void *minor_hdl
)
1587 zvol_state_t
*zv
= minor_hdl
;
1589 return ((zv
->zv_flags
& ZVOL_WCE
) ? 1 : 0);
1593 * Entry point for external callers to zvol_log_write
1596 zvol_log_write_minor(void *minor_hdl
, dmu_tx_t
*tx
, offset_t off
, ssize_t resid
,
1599 zvol_state_t
*zv
= minor_hdl
;
1601 zvol_log_write(zv
, tx
, off
, resid
, sync
);
1604 * END entry points to allow external callers access to the volume.
1608 * Log a DKIOCFREE/free-long-range to the ZIL with TX_TRUNCATE.
1611 zvol_log_truncate(zvol_state_t
*zv
, dmu_tx_t
*tx
, uint64_t off
, uint64_t len
,
1616 zilog_t
*zilog
= zv
->zv_zilog
;
1618 if (zil_replaying(zilog
, tx
))
1621 itx
= zil_itx_create(TX_TRUNCATE
, sizeof (*lr
));
1622 lr
= (lr_truncate_t
*)&itx
->itx_lr
;
1623 lr
->lr_foid
= ZVOL_OBJ
;
1624 lr
->lr_offset
= off
;
1625 lr
->lr_length
= len
;
1627 itx
->itx_sync
= sync
;
1628 zil_itx_assign(zilog
, itx
, tx
);
1632 * Dirtbag ioctls to support mkfs(1M) for UFS filesystems. See dkio(7I).
1633 * Also a dirtbag dkio ioctl for unmap/free-block functionality.
1637 zvol_ioctl(dev_t dev
, int cmd
, intptr_t arg
, int flag
, cred_t
*cr
, int *rvalp
)
1640 struct dk_callback
*dkc
;
1644 mutex_enter(&zfsdev_state_lock
);
1646 zv
= zfsdev_get_soft_state(getminor(dev
), ZSST_ZVOL
);
1649 mutex_exit(&zfsdev_state_lock
);
1650 return (SET_ERROR(ENXIO
));
1652 ASSERT(zv
->zv_total_opens
> 0);
1658 struct dk_cinfo dki
;
1660 bzero(&dki
, sizeof (dki
));
1661 (void) strcpy(dki
.dki_cname
, "zvol");
1662 (void) strcpy(dki
.dki_dname
, "zvol");
1663 dki
.dki_ctype
= DKC_UNKNOWN
;
1664 dki
.dki_unit
= getminor(dev
);
1665 dki
.dki_maxtransfer
=
1666 1 << (SPA_OLD_MAXBLOCKSHIFT
- zv
->zv_min_bs
);
1667 mutex_exit(&zfsdev_state_lock
);
1668 if (ddi_copyout(&dki
, (void *)arg
, sizeof (dki
), flag
))
1669 error
= SET_ERROR(EFAULT
);
1673 case DKIOCGMEDIAINFO
:
1675 struct dk_minfo dkm
;
1677 bzero(&dkm
, sizeof (dkm
));
1678 dkm
.dki_lbsize
= 1U << zv
->zv_min_bs
;
1679 dkm
.dki_capacity
= zv
->zv_volsize
>> zv
->zv_min_bs
;
1680 dkm
.dki_media_type
= DK_UNKNOWN
;
1681 mutex_exit(&zfsdev_state_lock
);
1682 if (ddi_copyout(&dkm
, (void *)arg
, sizeof (dkm
), flag
))
1683 error
= SET_ERROR(EFAULT
);
1687 case DKIOCGMEDIAINFOEXT
:
1689 struct dk_minfo_ext dkmext
;
1691 bzero(&dkmext
, sizeof (dkmext
));
1692 dkmext
.dki_lbsize
= 1U << zv
->zv_min_bs
;
1693 dkmext
.dki_pbsize
= zv
->zv_volblocksize
;
1694 dkmext
.dki_capacity
= zv
->zv_volsize
>> zv
->zv_min_bs
;
1695 dkmext
.dki_media_type
= DK_UNKNOWN
;
1696 mutex_exit(&zfsdev_state_lock
);
1697 if (ddi_copyout(&dkmext
, (void *)arg
, sizeof (dkmext
), flag
))
1698 error
= SET_ERROR(EFAULT
);
1704 uint64_t vs
= zv
->zv_volsize
;
1705 uint8_t bs
= zv
->zv_min_bs
;
1707 mutex_exit(&zfsdev_state_lock
);
1708 error
= zvol_getefi((void *)arg
, flag
, vs
, bs
);
1712 case DKIOCFLUSHWRITECACHE
:
1713 dkc
= (struct dk_callback
*)arg
;
1714 mutex_exit(&zfsdev_state_lock
);
1715 zil_commit(zv
->zv_zilog
, ZVOL_OBJ
);
1716 if ((flag
& FKIOCTL
) && dkc
!= NULL
&& dkc
->dkc_callback
) {
1717 (*dkc
->dkc_callback
)(dkc
->dkc_cookie
, error
);
1724 int wce
= (zv
->zv_flags
& ZVOL_WCE
) ? 1 : 0;
1725 if (ddi_copyout(&wce
, (void *)arg
, sizeof (int),
1727 error
= SET_ERROR(EFAULT
);
1733 if (ddi_copyin((void *)arg
, &wce
, sizeof (int),
1735 error
= SET_ERROR(EFAULT
);
1739 zv
->zv_flags
|= ZVOL_WCE
;
1740 mutex_exit(&zfsdev_state_lock
);
1742 zv
->zv_flags
&= ~ZVOL_WCE
;
1743 mutex_exit(&zfsdev_state_lock
);
1744 zil_commit(zv
->zv_zilog
, ZVOL_OBJ
);
1752 * commands using these (like prtvtoc) expect ENOTSUP
1753 * since we're emulating an EFI label
1755 error
= SET_ERROR(ENOTSUP
);
1759 rl
= zfs_range_lock(&zv
->zv_znode
, 0, zv
->zv_volsize
,
1761 error
= zvol_dumpify(zv
);
1762 zfs_range_unlock(rl
);
1766 if (!(zv
->zv_flags
& ZVOL_DUMPIFIED
))
1768 rl
= zfs_range_lock(&zv
->zv_znode
, 0, zv
->zv_volsize
,
1770 error
= zvol_dump_fini(zv
);
1771 zfs_range_unlock(rl
);
1779 if (!zvol_unmap_enabled
)
1782 if (ddi_copyin((void *)arg
, &df
, sizeof (df
), flag
)) {
1783 error
= SET_ERROR(EFAULT
);
1788 * Apply Postel's Law to length-checking. If they overshoot,
1789 * just blank out until the end, if there's a need to blank
1792 if (df
.df_start
>= zv
->zv_volsize
)
1793 break; /* No need to do anything... */
1795 mutex_exit(&zfsdev_state_lock
);
1797 rl
= zfs_range_lock(&zv
->zv_znode
, df
.df_start
, df
.df_length
,
1799 tx
= dmu_tx_create(zv
->zv_objset
);
1800 dmu_tx_mark_netfree(tx
);
1801 error
= dmu_tx_assign(tx
, TXG_WAIT
);
1805 zvol_log_truncate(zv
, tx
, df
.df_start
,
1806 df
.df_length
, B_TRUE
);
1808 error
= dmu_free_long_range(zv
->zv_objset
, ZVOL_OBJ
,
1809 df
.df_start
, df
.df_length
);
1812 zfs_range_unlock(rl
);
1816 * If the write-cache is disabled or 'sync' property
1817 * is set to 'always' then treat this as a synchronous
1818 * operation (i.e. commit to zil).
1820 if (!(zv
->zv_flags
& ZVOL_WCE
) ||
1821 (zv
->zv_objset
->os_sync
== ZFS_SYNC_ALWAYS
))
1822 zil_commit(zv
->zv_zilog
, ZVOL_OBJ
);
1825 * If the caller really wants synchronous writes, and
1826 * can't wait for them, don't return until the write
1829 if (df
.df_flags
& DF_WAIT_SYNC
) {
1831 dmu_objset_pool(zv
->zv_objset
), 0);
1838 error
= SET_ERROR(ENOTTY
);
1842 mutex_exit(&zfsdev_state_lock
);
1849 return (zvol_minors
!= 0);
1855 VERIFY(ddi_soft_state_init(&zfsdev_state
, sizeof (zfs_soft_state_t
),
1857 mutex_init(&zfsdev_state_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
1863 mutex_destroy(&zfsdev_state_lock
);
1864 ddi_soft_state_fini(&zfsdev_state
);
1869 zfs_mvdev_dump_feature_check(void *arg
, dmu_tx_t
*tx
)
1871 spa_t
*spa
= dmu_tx_pool(tx
)->dp_spa
;
1873 if (spa_feature_is_active(spa
, SPA_FEATURE_MULTI_VDEV_CRASH_DUMP
))
1880 zfs_mvdev_dump_activate_feature_sync(void *arg
, dmu_tx_t
*tx
)
1882 spa_t
*spa
= dmu_tx_pool(tx
)->dp_spa
;
1884 spa_feature_incr(spa
, SPA_FEATURE_MULTI_VDEV_CRASH_DUMP
, tx
);
1888 zvol_dump_init(zvol_state_t
*zv
, boolean_t resize
)
1892 objset_t
*os
= zv
->zv_objset
;
1893 spa_t
*spa
= dmu_objset_spa(os
);
1894 vdev_t
*vd
= spa
->spa_root_vdev
;
1895 nvlist_t
*nv
= NULL
;
1896 uint64_t version
= spa_version(spa
);
1897 uint64_t checksum
, compress
, refresrv
, vbs
, dedup
;
1899 ASSERT(MUTEX_HELD(&zfsdev_state_lock
));
1900 ASSERT(vd
->vdev_ops
== &vdev_root_ops
);
1902 error
= dmu_free_long_range(zv
->zv_objset
, ZVOL_OBJ
, 0,
1906 /* wait for dmu_free_long_range to actually free the blocks */
1907 txg_wait_synced(dmu_objset_pool(zv
->zv_objset
), 0);
1910 * If the pool on which the dump device is being initialized has more
1911 * than one child vdev, check that the MULTI_VDEV_CRASH_DUMP feature is
1912 * enabled. If so, bump that feature's counter to indicate that the
1913 * feature is active. We also check the vdev type to handle the
1915 * # zpool create test raidz disk1 disk2 disk3
1916 * Now have spa_root_vdev->vdev_children == 1 (the raidz vdev),
1917 * the raidz vdev itself has 3 children.
1919 if (vd
->vdev_children
> 1 || vd
->vdev_ops
== &vdev_raidz_ops
) {
1920 if (!spa_feature_is_enabled(spa
,
1921 SPA_FEATURE_MULTI_VDEV_CRASH_DUMP
))
1922 return (SET_ERROR(ENOTSUP
));
1923 (void) dsl_sync_task(spa_name(spa
),
1924 zfs_mvdev_dump_feature_check
,
1925 zfs_mvdev_dump_activate_feature_sync
, NULL
,
1926 2, ZFS_SPACE_CHECK_RESERVED
);
1930 error
= dsl_prop_get_integer(zv
->zv_name
,
1931 zfs_prop_to_name(ZFS_PROP_COMPRESSION
), &compress
, NULL
);
1933 error
= dsl_prop_get_integer(zv
->zv_name
,
1934 zfs_prop_to_name(ZFS_PROP_CHECKSUM
), &checksum
,
1938 error
= dsl_prop_get_integer(zv
->zv_name
,
1939 zfs_prop_to_name(ZFS_PROP_REFRESERVATION
),
1943 error
= dsl_prop_get_integer(zv
->zv_name
,
1944 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE
), &vbs
,
1947 if (version
>= SPA_VERSION_DEDUP
&& error
== 0) {
1948 error
= dsl_prop_get_integer(zv
->zv_name
,
1949 zfs_prop_to_name(ZFS_PROP_DEDUP
), &dedup
, NULL
);
1955 tx
= dmu_tx_create(os
);
1956 dmu_tx_hold_zap(tx
, ZVOL_ZAP_OBJ
, TRUE
, NULL
);
1957 dmu_tx_hold_bonus(tx
, ZVOL_OBJ
);
1958 error
= dmu_tx_assign(tx
, TXG_WAIT
);
1965 * If we are resizing the dump device then we only need to
1966 * update the refreservation to match the newly updated
1967 * zvolsize. Otherwise, we save off the original state of the
1968 * zvol so that we can restore them if the zvol is ever undumpified.
1971 error
= zap_update(os
, ZVOL_ZAP_OBJ
,
1972 zfs_prop_to_name(ZFS_PROP_REFRESERVATION
), 8, 1,
1973 &zv
->zv_volsize
, tx
);
1975 error
= zap_update(os
, ZVOL_ZAP_OBJ
,
1976 zfs_prop_to_name(ZFS_PROP_COMPRESSION
), 8, 1,
1979 error
= zap_update(os
, ZVOL_ZAP_OBJ
,
1980 zfs_prop_to_name(ZFS_PROP_CHECKSUM
), 8, 1,
1984 error
= zap_update(os
, ZVOL_ZAP_OBJ
,
1985 zfs_prop_to_name(ZFS_PROP_REFRESERVATION
), 8, 1,
1989 error
= zap_update(os
, ZVOL_ZAP_OBJ
,
1990 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE
), 8, 1,
1994 error
= dmu_object_set_blocksize(
1995 os
, ZVOL_OBJ
, SPA_OLD_MAXBLOCKSIZE
, 0, tx
);
1997 if (version
>= SPA_VERSION_DEDUP
&& error
== 0) {
1998 error
= zap_update(os
, ZVOL_ZAP_OBJ
,
1999 zfs_prop_to_name(ZFS_PROP_DEDUP
), 8, 1,
2003 zv
->zv_volblocksize
= SPA_OLD_MAXBLOCKSIZE
;
2008 * We only need update the zvol's property if we are initializing
2009 * the dump area for the first time.
2011 if (error
== 0 && !resize
) {
2013 * If MULTI_VDEV_CRASH_DUMP is active, use the NOPARITY checksum
2014 * function. Otherwise, use the old default -- OFF.
2016 checksum
= spa_feature_is_active(spa
,
2017 SPA_FEATURE_MULTI_VDEV_CRASH_DUMP
) ? ZIO_CHECKSUM_NOPARITY
:
2020 VERIFY(nvlist_alloc(&nv
, NV_UNIQUE_NAME
, KM_SLEEP
) == 0);
2021 VERIFY(nvlist_add_uint64(nv
,
2022 zfs_prop_to_name(ZFS_PROP_REFRESERVATION
), 0) == 0);
2023 VERIFY(nvlist_add_uint64(nv
,
2024 zfs_prop_to_name(ZFS_PROP_COMPRESSION
),
2025 ZIO_COMPRESS_OFF
) == 0);
2026 VERIFY(nvlist_add_uint64(nv
,
2027 zfs_prop_to_name(ZFS_PROP_CHECKSUM
),
2029 if (version
>= SPA_VERSION_DEDUP
) {
2030 VERIFY(nvlist_add_uint64(nv
,
2031 zfs_prop_to_name(ZFS_PROP_DEDUP
),
2032 ZIO_CHECKSUM_OFF
) == 0);
2035 error
= zfs_set_prop_nvlist(zv
->zv_name
, ZPROP_SRC_LOCAL
,
2040 /* Allocate the space for the dump */
2042 error
= zvol_prealloc(zv
);
2047 zvol_dumpify(zvol_state_t
*zv
)
2050 uint64_t dumpsize
= 0;
2052 objset_t
*os
= zv
->zv_objset
;
2054 if (zv
->zv_flags
& ZVOL_RDONLY
)
2055 return (SET_ERROR(EROFS
));
2057 if (zap_lookup(zv
->zv_objset
, ZVOL_ZAP_OBJ
, ZVOL_DUMPSIZE
,
2058 8, 1, &dumpsize
) != 0 || dumpsize
!= zv
->zv_volsize
) {
2059 boolean_t resize
= (dumpsize
> 0);
2061 if ((error
= zvol_dump_init(zv
, resize
)) != 0) {
2062 (void) zvol_dump_fini(zv
);
2068 * Build up our lba mapping.
2070 error
= zvol_get_lbas(zv
);
2072 (void) zvol_dump_fini(zv
);
2076 tx
= dmu_tx_create(os
);
2077 dmu_tx_hold_zap(tx
, ZVOL_ZAP_OBJ
, TRUE
, NULL
);
2078 error
= dmu_tx_assign(tx
, TXG_WAIT
);
2081 (void) zvol_dump_fini(zv
);
2085 zv
->zv_flags
|= ZVOL_DUMPIFIED
;
2086 error
= zap_update(os
, ZVOL_ZAP_OBJ
, ZVOL_DUMPSIZE
, 8, 1,
2087 &zv
->zv_volsize
, tx
);
2091 (void) zvol_dump_fini(zv
);
2095 txg_wait_synced(dmu_objset_pool(os
), 0);
2100 zvol_dump_fini(zvol_state_t
*zv
)
2103 objset_t
*os
= zv
->zv_objset
;
2106 uint64_t checksum
, compress
, refresrv
, vbs
, dedup
;
2107 uint64_t version
= spa_version(dmu_objset_spa(zv
->zv_objset
));
2110 * Attempt to restore the zvol back to its pre-dumpified state.
2111 * This is a best-effort attempt as it's possible that not all
2112 * of these properties were initialized during the dumpify process
2113 * (i.e. error during zvol_dump_init).
2116 tx
= dmu_tx_create(os
);
2117 dmu_tx_hold_zap(tx
, ZVOL_ZAP_OBJ
, TRUE
, NULL
);
2118 error
= dmu_tx_assign(tx
, TXG_WAIT
);
2123 (void) zap_remove(os
, ZVOL_ZAP_OBJ
, ZVOL_DUMPSIZE
, tx
);
2126 (void) zap_lookup(zv
->zv_objset
, ZVOL_ZAP_OBJ
,
2127 zfs_prop_to_name(ZFS_PROP_CHECKSUM
), 8, 1, &checksum
);
2128 (void) zap_lookup(zv
->zv_objset
, ZVOL_ZAP_OBJ
,
2129 zfs_prop_to_name(ZFS_PROP_COMPRESSION
), 8, 1, &compress
);
2130 (void) zap_lookup(zv
->zv_objset
, ZVOL_ZAP_OBJ
,
2131 zfs_prop_to_name(ZFS_PROP_REFRESERVATION
), 8, 1, &refresrv
);
2132 (void) zap_lookup(zv
->zv_objset
, ZVOL_ZAP_OBJ
,
2133 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE
), 8, 1, &vbs
);
2135 VERIFY(nvlist_alloc(&nv
, NV_UNIQUE_NAME
, KM_SLEEP
) == 0);
2136 (void) nvlist_add_uint64(nv
,
2137 zfs_prop_to_name(ZFS_PROP_CHECKSUM
), checksum
);
2138 (void) nvlist_add_uint64(nv
,
2139 zfs_prop_to_name(ZFS_PROP_COMPRESSION
), compress
);
2140 (void) nvlist_add_uint64(nv
,
2141 zfs_prop_to_name(ZFS_PROP_REFRESERVATION
), refresrv
);
2142 if (version
>= SPA_VERSION_DEDUP
&&
2143 zap_lookup(zv
->zv_objset
, ZVOL_ZAP_OBJ
,
2144 zfs_prop_to_name(ZFS_PROP_DEDUP
), 8, 1, &dedup
) == 0) {
2145 (void) nvlist_add_uint64(nv
,
2146 zfs_prop_to_name(ZFS_PROP_DEDUP
), dedup
);
2148 (void) zfs_set_prop_nvlist(zv
->zv_name
, ZPROP_SRC_LOCAL
,
2152 zvol_free_extents(zv
);
2153 zv
->zv_flags
&= ~ZVOL_DUMPIFIED
;
2154 (void) dmu_free_long_range(os
, ZVOL_OBJ
, 0, DMU_OBJECT_END
);
2155 /* wait for dmu_free_long_range to actually free the blocks */
2156 txg_wait_synced(dmu_objset_pool(zv
->zv_objset
), 0);
2157 tx
= dmu_tx_create(os
);
2158 dmu_tx_hold_bonus(tx
, ZVOL_OBJ
);
2159 error
= dmu_tx_assign(tx
, TXG_WAIT
);
2164 if (dmu_object_set_blocksize(os
, ZVOL_OBJ
, vbs
, 0, tx
) == 0)
2165 zv
->zv_volblocksize
= vbs
;