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.
23 * Copyright (c) 2011, 2020 by Delphix. All rights reserved.
24 * Copyright (c) 2017, Intel Corporation.
27 #ifndef _SYS_VDEV_IMPL_H
28 #define _SYS_VDEV_IMPL_H
31 #include <sys/bpobj.h>
33 #include <sys/metaslab.h>
34 #include <sys/nvpair.h>
35 #include <sys/space_map.h>
38 #include <sys/uberblock_impl.h>
39 #include <sys/vdev_indirect_mapping.h>
40 #include <sys/vdev_indirect_births.h>
41 #include <sys/vdev_removal.h>
42 #include <sys/zfs_ratelimit.h>
49 * Virtual device descriptors.
51 * All storage pool operations go through the virtual device framework,
52 * which provides data replication and I/O scheduling.
56 * Forward declarations that lots of things need.
58 typedef struct vdev_queue vdev_queue_t
;
59 typedef struct vdev_cache vdev_cache_t
;
60 typedef struct vdev_cache_entry vdev_cache_entry_t
;
63 extern int zfs_vdev_queue_depth_pct
;
64 extern int zfs_vdev_def_queue_depth
;
65 extern uint32_t zfs_vdev_async_write_max_active
;
68 * Virtual device operations
70 typedef int vdev_open_func_t(vdev_t
*vd
, uint64_t *size
, uint64_t *max_size
,
72 typedef void vdev_close_func_t(vdev_t
*vd
);
73 typedef uint64_t vdev_asize_func_t(vdev_t
*vd
, uint64_t psize
);
74 typedef void vdev_io_start_func_t(zio_t
*zio
);
75 typedef void vdev_io_done_func_t(zio_t
*zio
);
76 typedef void vdev_state_change_func_t(vdev_t
*vd
, int, int);
77 typedef boolean_t
vdev_need_resilver_func_t(vdev_t
*vd
, uint64_t, size_t);
78 typedef void vdev_hold_func_t(vdev_t
*vd
);
79 typedef void vdev_rele_func_t(vdev_t
*vd
);
81 typedef void vdev_remap_cb_t(uint64_t inner_offset
, vdev_t
*vd
,
82 uint64_t offset
, uint64_t size
, void *arg
);
83 typedef void vdev_remap_func_t(vdev_t
*vd
, uint64_t offset
, uint64_t size
,
84 vdev_remap_cb_t callback
, void *arg
);
86 * Given a target vdev, translates the logical range "in" to the physical
89 typedef void vdev_xlation_func_t(vdev_t
*cvd
, const range_seg64_t
*in
,
92 typedef const struct vdev_ops
{
93 vdev_open_func_t
*vdev_op_open
;
94 vdev_close_func_t
*vdev_op_close
;
95 vdev_asize_func_t
*vdev_op_asize
;
96 vdev_io_start_func_t
*vdev_op_io_start
;
97 vdev_io_done_func_t
*vdev_op_io_done
;
98 vdev_state_change_func_t
*vdev_op_state_change
;
99 vdev_need_resilver_func_t
*vdev_op_need_resilver
;
100 vdev_hold_func_t
*vdev_op_hold
;
101 vdev_rele_func_t
*vdev_op_rele
;
102 vdev_remap_func_t
*vdev_op_remap
;
104 * For translating ranges from non-leaf vdevs (e.g. raidz) to leaves.
105 * Used when initializing vdevs. Isn't used by leaf ops.
107 vdev_xlation_func_t
*vdev_op_xlate
;
108 char vdev_op_type
[16];
109 boolean_t vdev_op_leaf
;
113 * Virtual device properties
115 struct vdev_cache_entry
{
119 avl_node_t ve_offset_node
;
120 avl_node_t ve_lastused_node
;
122 uint16_t ve_missed_update
;
127 avl_tree_t vc_offset_tree
;
128 avl_tree_t vc_lastused_tree
;
132 typedef struct vdev_queue_class
{
136 * Sorted by offset or timestamp, depending on if the queue is
137 * LBA-ordered vs FIFO.
139 avl_tree_t vqc_queued_tree
;
140 } vdev_queue_class_t
;
144 vdev_queue_class_t vq_class
[ZIO_PRIORITY_NUM_QUEUEABLE
];
145 avl_tree_t vq_active_tree
;
146 avl_tree_t vq_read_offset_tree
;
147 avl_tree_t vq_write_offset_tree
;
148 avl_tree_t vq_trim_offset_tree
;
149 uint64_t vq_last_offset
;
150 hrtime_t vq_io_complete_ts
; /* time last i/o completed */
151 hrtime_t vq_io_delta_ts
;
152 zio_t vq_io_search
; /* used as local for stack reduction */
156 typedef enum vdev_alloc_bias
{
158 VDEV_BIAS_LOG
, /* dedicated to ZIL data (SLOG) */
159 VDEV_BIAS_SPECIAL
, /* dedicated to ddt, metadata, and small blks */
160 VDEV_BIAS_DEDUP
/* dedicated to dedup metadata */
165 * On-disk indirect vdev state.
167 * An indirect vdev is described exclusively in the MOS config of a pool.
168 * The config for an indirect vdev includes several fields, which are
169 * accessed in memory by a vdev_indirect_config_t.
171 typedef struct vdev_indirect_config
{
173 * Object (in MOS) which contains the indirect mapping. This object
174 * contains an array of vdev_indirect_mapping_entry_phys_t ordered by
175 * vimep_src. The bonus buffer for this object is a
176 * vdev_indirect_mapping_phys_t. This object is allocated when a vdev
177 * removal is initiated.
179 * Note that this object can be empty if none of the data on the vdev
180 * has been copied yet.
182 uint64_t vic_mapping_object
;
185 * Object (in MOS) which contains the birth times for the mapping
186 * entries. This object contains an array of
187 * vdev_indirect_birth_entry_phys_t sorted by vibe_offset. The bonus
188 * buffer for this object is a vdev_indirect_birth_phys_t. This object
189 * is allocated when a vdev removal is initiated.
191 * Note that this object can be empty if none of the vdev has yet been
194 uint64_t vic_births_object
;
197 * This is the vdev ID which was removed previous to this vdev, or
198 * UINT64_MAX if there are no previously removed vdevs.
200 uint64_t vic_prev_indirect_vdev
;
201 } vdev_indirect_config_t
;
204 * Virtual device descriptor
208 * Common to all vdev types.
210 uint64_t vdev_id
; /* child number in vdev parent */
211 uint64_t vdev_guid
; /* unique ID for this vdev */
212 uint64_t vdev_guid_sum
; /* self guid + all child guids */
213 uint64_t vdev_orig_guid
; /* orig. guid prior to remove */
214 uint64_t vdev_asize
; /* allocatable device capacity */
215 uint64_t vdev_min_asize
; /* min acceptable asize */
216 uint64_t vdev_max_asize
; /* max acceptable asize */
217 uint64_t vdev_ashift
; /* block alignment shift */
218 uint64_t vdev_state
; /* see VDEV_STATE_* #defines */
219 uint64_t vdev_prevstate
; /* used when reopening a vdev */
220 vdev_ops_t
*vdev_ops
; /* vdev operations */
221 spa_t
*vdev_spa
; /* spa for this vdev */
222 void *vdev_tsd
; /* type-specific data */
223 vdev_t
*vdev_top
; /* top-level vdev */
224 vdev_t
*vdev_parent
; /* parent vdev */
225 vdev_t
**vdev_child
; /* array of children */
226 uint64_t vdev_children
; /* number of children */
227 vdev_stat_t vdev_stat
; /* virtual device statistics */
228 vdev_stat_ex_t vdev_stat_ex
; /* extended statistics */
229 boolean_t vdev_expanding
; /* expand the vdev? */
230 boolean_t vdev_reopening
; /* reopen in progress? */
231 boolean_t vdev_nonrot
; /* true if solid state */
232 int vdev_open_error
; /* error on last open */
233 kthread_t
*vdev_open_thread
; /* thread opening children */
234 uint64_t vdev_crtxg
; /* txg when top-level was added */
237 * Top-level vdev state.
239 uint64_t vdev_ms_array
; /* metaslab array object */
240 uint64_t vdev_ms_shift
; /* metaslab size shift */
241 uint64_t vdev_ms_count
; /* number of metaslabs */
242 metaslab_group_t
*vdev_mg
; /* metaslab group */
243 metaslab_t
**vdev_ms
; /* metaslab array */
244 uint64_t vdev_pending_fastwrite
; /* allocated fastwrites */
245 txg_list_t vdev_ms_list
; /* per-txg dirty metaslab lists */
246 txg_list_t vdev_dtl_list
; /* per-txg dirty DTL lists */
247 txg_node_t vdev_txg_node
; /* per-txg dirty vdev linkage */
248 boolean_t vdev_remove_wanted
; /* async remove wanted? */
249 boolean_t vdev_probe_wanted
; /* async probe wanted? */
250 list_node_t vdev_config_dirty_node
; /* config dirty list */
251 list_node_t vdev_state_dirty_node
; /* state dirty list */
252 uint64_t vdev_deflate_ratio
; /* deflation ratio (x512) */
253 uint64_t vdev_islog
; /* is an intent log device */
254 uint64_t vdev_removing
; /* device is being removed? */
255 boolean_t vdev_ishole
; /* is a hole in the namespace */
256 uint64_t vdev_top_zap
;
257 vdev_alloc_bias_t vdev_alloc_bias
; /* metaslab allocation bias */
259 /* pool checkpoint related */
260 space_map_t
*vdev_checkpoint_sm
; /* contains reserved blocks */
262 /* Initialize related */
263 boolean_t vdev_initialize_exit_wanted
;
264 vdev_initializing_state_t vdev_initialize_state
;
265 list_node_t vdev_initialize_node
;
266 kthread_t
*vdev_initialize_thread
;
267 /* Protects vdev_initialize_thread and vdev_initialize_state. */
268 kmutex_t vdev_initialize_lock
;
269 kcondvar_t vdev_initialize_cv
;
270 uint64_t vdev_initialize_offset
[TXG_SIZE
];
271 uint64_t vdev_initialize_last_offset
;
272 range_tree_t
*vdev_initialize_tree
; /* valid while initializing */
273 uint64_t vdev_initialize_bytes_est
;
274 uint64_t vdev_initialize_bytes_done
;
275 uint64_t vdev_initialize_action_time
; /* start and end time */
278 boolean_t vdev_trim_exit_wanted
;
279 boolean_t vdev_autotrim_exit_wanted
;
280 vdev_trim_state_t vdev_trim_state
;
281 list_node_t vdev_trim_node
;
282 kmutex_t vdev_autotrim_lock
;
283 kcondvar_t vdev_autotrim_cv
;
284 kthread_t
*vdev_autotrim_thread
;
285 /* Protects vdev_trim_thread and vdev_trim_state. */
286 kmutex_t vdev_trim_lock
;
287 kcondvar_t vdev_trim_cv
;
288 kthread_t
*vdev_trim_thread
;
289 uint64_t vdev_trim_offset
[TXG_SIZE
];
290 uint64_t vdev_trim_last_offset
;
291 uint64_t vdev_trim_bytes_est
;
292 uint64_t vdev_trim_bytes_done
;
293 uint64_t vdev_trim_rate
; /* requested rate (bytes/sec) */
294 uint64_t vdev_trim_partial
; /* requested partial TRIM */
295 uint64_t vdev_trim_secure
; /* requested secure TRIM */
296 uint64_t vdev_trim_action_time
; /* start and end time */
298 /* for limiting outstanding I/Os (initialize and TRIM) */
299 kmutex_t vdev_initialize_io_lock
;
300 kcondvar_t vdev_initialize_io_cv
;
301 uint64_t vdev_initialize_inflight
;
302 kmutex_t vdev_trim_io_lock
;
303 kcondvar_t vdev_trim_io_cv
;
304 uint64_t vdev_trim_inflight
[3];
307 * Values stored in the config for an indirect or removing vdev.
309 vdev_indirect_config_t vdev_indirect_config
;
312 * The vdev_indirect_rwlock protects the vdev_indirect_mapping
313 * pointer from changing on indirect vdevs (when it is condensed).
314 * Note that removing (not yet indirect) vdevs have different
315 * access patterns (the mapping is not accessed from open context,
316 * e.g. from zio_read) and locking strategy (e.g. svr_lock).
318 krwlock_t vdev_indirect_rwlock
;
319 vdev_indirect_mapping_t
*vdev_indirect_mapping
;
320 vdev_indirect_births_t
*vdev_indirect_births
;
323 * In memory data structures used to manage the obsolete sm, for
324 * indirect or removing vdevs.
326 * The vdev_obsolete_segments is the in-core record of the segments
327 * that are no longer referenced anywhere in the pool (due to
328 * being freed or remapped and not referenced by any snapshots).
329 * During a sync, segments are added to vdev_obsolete_segments
330 * via vdev_indirect_mark_obsolete(); at the end of each sync
331 * pass, this is appended to vdev_obsolete_sm via
332 * vdev_indirect_sync_obsolete(). The vdev_obsolete_lock
333 * protects against concurrent modifications of vdev_obsolete_segments
334 * from multiple zio threads.
336 kmutex_t vdev_obsolete_lock
;
337 range_tree_t
*vdev_obsolete_segments
;
338 space_map_t
*vdev_obsolete_sm
;
341 * Protects the vdev_scan_io_queue field itself as well as the
342 * structure's contents (when present).
344 kmutex_t vdev_scan_io_queue_lock
;
345 struct dsl_scan_io_queue
*vdev_scan_io_queue
;
350 range_tree_t
*vdev_dtl
[DTL_TYPES
]; /* dirty time logs */
351 space_map_t
*vdev_dtl_sm
; /* dirty time log space map */
352 txg_node_t vdev_dtl_node
; /* per-txg dirty DTL linkage */
353 uint64_t vdev_dtl_object
; /* DTL object */
354 uint64_t vdev_psize
; /* physical device capacity */
355 uint64_t vdev_wholedisk
; /* true if this is a whole disk */
356 uint64_t vdev_offline
; /* persistent offline state */
357 uint64_t vdev_faulted
; /* persistent faulted state */
358 uint64_t vdev_degraded
; /* persistent degraded state */
359 uint64_t vdev_removed
; /* persistent removed state */
360 uint64_t vdev_resilver_txg
; /* persistent resilvering state */
361 uint64_t vdev_nparity
; /* number of parity devices for raidz */
362 char *vdev_path
; /* vdev path (if any) */
363 char *vdev_devid
; /* vdev devid (if any) */
364 char *vdev_physpath
; /* vdev device path (if any) */
365 char *vdev_enc_sysfs_path
; /* enclosure sysfs path */
366 char *vdev_fru
; /* physical FRU location */
367 uint64_t vdev_not_present
; /* not present during import */
368 uint64_t vdev_unspare
; /* unspare when resilvering done */
369 boolean_t vdev_nowritecache
; /* true if flushwritecache failed */
370 boolean_t vdev_has_trim
; /* TRIM is supported */
371 boolean_t vdev_has_securetrim
; /* secure TRIM is supported */
372 boolean_t vdev_checkremove
; /* temporary online test */
373 boolean_t vdev_forcefault
; /* force online fault */
374 boolean_t vdev_splitting
; /* split or repair in progress */
375 boolean_t vdev_delayed_close
; /* delayed device close? */
376 boolean_t vdev_tmpoffline
; /* device taken offline temporarily? */
377 boolean_t vdev_detached
; /* device detached? */
378 boolean_t vdev_cant_read
; /* vdev is failing all reads */
379 boolean_t vdev_cant_write
; /* vdev is failing all writes */
380 boolean_t vdev_isspare
; /* was a hot spare */
381 boolean_t vdev_isl2cache
; /* was a l2cache device */
382 boolean_t vdev_copy_uberblocks
; /* post expand copy uberblocks */
383 boolean_t vdev_resilver_deferred
; /* resilver deferred */
384 vdev_queue_t vdev_queue
; /* I/O deadline schedule queue */
385 vdev_cache_t vdev_cache
; /* physical block cache */
386 spa_aux_vdev_t
*vdev_aux
; /* for l2cache and spares vdevs */
387 zio_t
*vdev_probe_zio
; /* root of current probe */
388 vdev_aux_t vdev_label_aux
; /* on-disk aux state */
389 uint64_t vdev_leaf_zap
;
390 hrtime_t vdev_mmp_pending
; /* 0 if write finished */
391 uint64_t vdev_mmp_kstat_id
; /* to find kstat entry */
392 uint64_t vdev_expansion_time
; /* vdev's last expansion time */
393 list_node_t vdev_leaf_node
; /* leaf vdev list */
396 * For DTrace to work in userland (libzpool) context, these fields must
397 * remain at the end of the structure. DTrace will use the kernel's
398 * CTF definition for 'struct vdev', and since the size of a kmutex_t is
399 * larger in userland, the offsets for the rest of the fields would be
402 kmutex_t vdev_dtl_lock
; /* vdev_dtl_{map,resilver} */
403 kmutex_t vdev_stat_lock
; /* vdev_stat */
404 kmutex_t vdev_probe_lock
; /* protects vdev_probe_zio */
407 * We rate limit ZIO delay and ZIO checksum events, since they
408 * can flood ZED with tons of events when a drive is acting up.
410 zfs_ratelimit_t vdev_delay_rl
;
411 zfs_ratelimit_t vdev_checksum_rl
;
414 #define VDEV_RAIDZ_MAXPARITY 3
416 #define VDEV_PAD_SIZE (8 << 10)
417 /* 2 padding areas (vl_pad1 and vl_be) to skip */
418 #define VDEV_SKIP_SIZE VDEV_PAD_SIZE * 2
419 #define VDEV_PHYS_SIZE (112 << 10)
420 #define VDEV_UBERBLOCK_RING (128 << 10)
423 * MMP blocks occupy the last MMP_BLOCKS_PER_LABEL slots in the uberblock
424 * ring when MMP is enabled.
426 #define MMP_BLOCKS_PER_LABEL 1
428 /* The largest uberblock we support is 8k. */
429 #define MAX_UBERBLOCK_SHIFT (13)
430 #define VDEV_UBERBLOCK_SHIFT(vd) \
431 MIN(MAX((vd)->vdev_top->vdev_ashift, UBERBLOCK_SHIFT), \
433 #define VDEV_UBERBLOCK_COUNT(vd) \
434 (VDEV_UBERBLOCK_RING >> VDEV_UBERBLOCK_SHIFT(vd))
435 #define VDEV_UBERBLOCK_OFFSET(vd, n) \
436 offsetof(vdev_label_t, vl_uberblock[(n) << VDEV_UBERBLOCK_SHIFT(vd)])
437 #define VDEV_UBERBLOCK_SIZE(vd) (1ULL << VDEV_UBERBLOCK_SHIFT(vd))
439 typedef struct vdev_phys
{
440 char vp_nvlist
[VDEV_PHYS_SIZE
- sizeof (zio_eck_t
)];
444 typedef enum vbe_vers
{
445 /* The bootenv file is stored as ascii text in the envblock */
449 * The bootenv file is converted to an nvlist and then packed into the
455 typedef struct vdev_boot_envblock
{
456 uint64_t vbe_version
;
457 char vbe_bootenv
[VDEV_PAD_SIZE
- sizeof (uint64_t) -
460 } vdev_boot_envblock_t
;
462 CTASSERT_GLOBAL(sizeof (vdev_boot_envblock_t
) == VDEV_PAD_SIZE
);
464 typedef struct vdev_label
{
465 char vl_pad1
[VDEV_PAD_SIZE
]; /* 8K */
466 vdev_boot_envblock_t vl_be
; /* 8K */
467 vdev_phys_t vl_vdev_phys
; /* 112K */
468 char vl_uberblock
[VDEV_UBERBLOCK_RING
]; /* 128K */
469 } vdev_label_t
; /* 256K total */
474 #define VDD_METASLAB 0x01
477 /* Offset of embedded boot loader region on each label */
478 #define VDEV_BOOT_OFFSET (2 * sizeof (vdev_label_t))
480 * Size of embedded boot loader region on each label.
481 * The total size of the first two labels plus the boot area is 4MB.
483 #define VDEV_BOOT_SIZE (7ULL << 19) /* 3.5M */
486 * Size of label regions at the start and end of each leaf device.
488 #define VDEV_LABEL_START_SIZE (2 * sizeof (vdev_label_t) + VDEV_BOOT_SIZE)
489 #define VDEV_LABEL_END_SIZE (2 * sizeof (vdev_label_t))
490 #define VDEV_LABELS 4
491 #define VDEV_BEST_LABEL VDEV_LABELS
493 #define VDEV_ALLOC_LOAD 0
494 #define VDEV_ALLOC_ADD 1
495 #define VDEV_ALLOC_SPARE 2
496 #define VDEV_ALLOC_L2CACHE 3
497 #define VDEV_ALLOC_ROOTPOOL 4
498 #define VDEV_ALLOC_SPLIT 5
499 #define VDEV_ALLOC_ATTACH 6
502 * Allocate or free a vdev
504 extern vdev_t
*vdev_alloc_common(spa_t
*spa
, uint_t id
, uint64_t guid
,
506 extern int vdev_alloc(spa_t
*spa
, vdev_t
**vdp
, nvlist_t
*config
,
507 vdev_t
*parent
, uint_t id
, int alloctype
);
508 extern void vdev_free(vdev_t
*vd
);
511 * Add or remove children and parents
513 extern void vdev_add_child(vdev_t
*pvd
, vdev_t
*cvd
);
514 extern void vdev_remove_child(vdev_t
*pvd
, vdev_t
*cvd
);
515 extern void vdev_compact_children(vdev_t
*pvd
);
516 extern vdev_t
*vdev_add_parent(vdev_t
*cvd
, vdev_ops_t
*ops
);
517 extern void vdev_remove_parent(vdev_t
*cvd
);
520 * vdev sync load and sync
522 extern boolean_t
vdev_log_state_valid(vdev_t
*vd
);
523 extern int vdev_load(vdev_t
*vd
);
524 extern int vdev_dtl_load(vdev_t
*vd
);
525 extern void vdev_sync(vdev_t
*vd
, uint64_t txg
);
526 extern void vdev_sync_done(vdev_t
*vd
, uint64_t txg
);
527 extern void vdev_dirty(vdev_t
*vd
, int flags
, void *arg
, uint64_t txg
);
528 extern void vdev_dirty_leaves(vdev_t
*vd
, int flags
, uint64_t txg
);
531 * Available vdev types.
533 extern vdev_ops_t vdev_root_ops
;
534 extern vdev_ops_t vdev_mirror_ops
;
535 extern vdev_ops_t vdev_replacing_ops
;
536 extern vdev_ops_t vdev_raidz_ops
;
537 extern vdev_ops_t vdev_disk_ops
;
538 extern vdev_ops_t vdev_file_ops
;
539 extern vdev_ops_t vdev_missing_ops
;
540 extern vdev_ops_t vdev_hole_ops
;
541 extern vdev_ops_t vdev_spare_ops
;
542 extern vdev_ops_t vdev_indirect_ops
;
545 * Common size functions
547 extern void vdev_default_xlate(vdev_t
*vd
, const range_seg64_t
*in
,
549 extern uint64_t vdev_default_asize(vdev_t
*vd
, uint64_t psize
);
550 extern uint64_t vdev_get_min_asize(vdev_t
*vd
);
551 extern void vdev_set_min_asize(vdev_t
*vd
);
556 extern int zfs_vdev_standard_sm_blksz
;
557 /* zdb uses this tunable, so it must be declared here to make lint happy. */
558 extern int zfs_vdev_cache_size
;
561 * Functions from vdev_indirect.c
563 extern void vdev_indirect_sync_obsolete(vdev_t
*vd
, dmu_tx_t
*tx
);
564 extern boolean_t
vdev_indirect_should_condense(vdev_t
*vd
);
565 extern void spa_condense_indirect_start_sync(vdev_t
*vd
, dmu_tx_t
*tx
);
566 extern int vdev_obsolete_sm_object(vdev_t
*vd
, uint64_t *sm_obj
);
567 extern int vdev_obsolete_counts_are_precise(vdev_t
*vd
, boolean_t
*are_precise
);
570 * Other miscellaneous functions
572 int vdev_checkpoint_sm_object(vdev_t
*vd
, uint64_t *sm_obj
);
578 #endif /* _SYS_VDEV_IMPL_H */