1/*
2 * CDDL HEADER START
3 *
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.
7 *
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.
12 *
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]
18 *
19 * CDDL HEADER END
20 */
21/*
22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23 * Copyright (c) 2011, 2018 by Delphix. All rights reserved.
24 * Copyright (c) 2011, 2019 by Delphix. All rights reserved.
25 * Copyright (c) 2017, Intel Corporation.
26 * Copyright 2019 Joyent, Inc.
27 */
28
29#ifndef _SYS_VDEV_IMPL_H
30#define	_SYS_VDEV_IMPL_H
31
32#include <sys/avl.h>
33#include <sys/bpobj.h>
34#include <sys/dmu.h>
35#include <sys/metaslab.h>
36#include <sys/nvpair.h>
37#include <sys/space_map.h>
38#include <sys/vdev.h>
39#include <sys/dkio.h>
40#include <sys/uberblock_impl.h>
41#include <sys/vdev_indirect_mapping.h>
42#include <sys/vdev_indirect_births.h>
43#include <sys/vdev_removal.h>
44
45#ifdef	__cplusplus
46extern "C" {
47#endif
48
49/*
50 * Virtual device descriptors.
51 *
52 * All storage pool operations go through the virtual device framework,
53 * which provides data replication and I/O scheduling.
54 */
55
56/*
57 * Forward declarations that lots of things need.
58 */
59typedef struct vdev_queue vdev_queue_t;
60typedef struct vdev_cache vdev_cache_t;
61typedef struct vdev_cache_entry vdev_cache_entry_t;
62struct abd;
63
64extern int zfs_vdev_queue_depth_pct;
65extern int zfs_vdev_def_queue_depth;
66extern uint32_t zfs_vdev_async_write_max_active;
67
68/*
69 * Virtual device operations
70 */
71typedef int	vdev_open_func_t(vdev_t *vd, uint64_t *size, uint64_t *max_size,
72    uint64_t *ashift);
73typedef void	vdev_close_func_t(vdev_t *vd);
74typedef uint64_t vdev_asize_func_t(vdev_t *vd, uint64_t psize);
75typedef void	vdev_io_start_func_t(zio_t *zio);
76typedef void	vdev_io_done_func_t(zio_t *zio);
77typedef void	vdev_state_change_func_t(vdev_t *vd, int, int);
78typedef boolean_t vdev_need_resilver_func_t(vdev_t *vd, uint64_t, size_t);
79typedef void	vdev_hold_func_t(vdev_t *vd);
80typedef void	vdev_rele_func_t(vdev_t *vd);
81
82typedef void	vdev_remap_cb_t(uint64_t inner_offset, vdev_t *vd,
83    uint64_t offset, uint64_t size, void *arg);
84typedef void	vdev_remap_func_t(vdev_t *vd, uint64_t offset, uint64_t size,
85    vdev_remap_cb_t callback, void *arg);
86/*
87 * Given a target vdev, translates the logical range "in" to the physical
88 * range "res"
89 */
90typedef void vdev_xlation_func_t(vdev_t *cvd, const range_seg_t *in,
91    range_seg_t *res);
92
93typedef struct vdev_ops {
94	vdev_open_func_t		*vdev_op_open;
95	vdev_close_func_t		*vdev_op_close;
96	vdev_asize_func_t		*vdev_op_asize;
97	vdev_io_start_func_t		*vdev_op_io_start;
98	vdev_io_done_func_t		*vdev_op_io_done;
99	vdev_state_change_func_t	*vdev_op_state_change;
100	vdev_need_resilver_func_t	*vdev_op_need_resilver;
101	vdev_hold_func_t		*vdev_op_hold;
102	vdev_rele_func_t		*vdev_op_rele;
103	vdev_remap_func_t		*vdev_op_remap;
104	/*
105	 * For translating ranges from non-leaf vdevs (e.g. raidz) to leaves.
106	 * Used when initializing vdevs. Isn't used by leaf ops.
107	 */
108	vdev_xlation_func_t		*vdev_op_xlate;
109	char				vdev_op_type[16];
110	boolean_t			vdev_op_leaf;
111} vdev_ops_t;
112
113/*
114 * Virtual device properties
115 */
116struct vdev_cache_entry {
117	struct abd	*ve_abd;
118	uint64_t	ve_offset;
119	uint64_t	ve_lastused;
120	avl_node_t	ve_offset_node;
121	avl_node_t	ve_lastused_node;
122	uint32_t	ve_hits;
123	uint16_t	ve_missed_update;
124	zio_t		*ve_fill_io;
125};
126
127struct vdev_cache {
128	avl_tree_t	vc_offset_tree;
129	avl_tree_t	vc_lastused_tree;
130	kmutex_t	vc_lock;
131};
132
133typedef struct vdev_queue_class {
134	uint32_t	vqc_active;
135
136	/*
137	 * Sorted by offset or timestamp, depending on if the queue is
138	 * LBA-ordered vs FIFO.
139	 */
140	avl_tree_t	vqc_queued_tree;
141} vdev_queue_class_t;
142
143struct vdev_queue {
144	vdev_t		*vq_vdev;
145	vdev_queue_class_t vq_class[ZIO_PRIORITY_NUM_QUEUEABLE];
146	avl_tree_t	vq_active_tree;
147	avl_tree_t	vq_read_offset_tree;
148	avl_tree_t	vq_write_offset_tree;
149	avl_tree_t	vq_trim_offset_tree;
150	uint64_t	vq_last_offset;
151	hrtime_t	vq_io_complete_ts; /* time last i/o completed */
152	kmutex_t	vq_lock;
153};
154
155typedef enum vdev_alloc_bias {
156	VDEV_BIAS_NONE,
157	VDEV_BIAS_LOG,		/* dedicated to ZIL data (SLOG) */
158	VDEV_BIAS_SPECIAL,	/* dedicated to ddt, metadata, and small blks */
159	VDEV_BIAS_DEDUP		/* dedicated to dedup metadata */
160} vdev_alloc_bias_t;
161
162
163/*
164 * On-disk indirect vdev state.
165 *
166 * An indirect vdev is described exclusively in the MOS config of a pool.
167 * The config for an indirect vdev includes several fields, which are
168 * accessed in memory by a vdev_indirect_config_t.
169 */
170typedef struct vdev_indirect_config {
171	/*
172	 * Object (in MOS) which contains the indirect mapping. This object
173	 * contains an array of vdev_indirect_mapping_entry_phys_t ordered by
174	 * vimep_src. The bonus buffer for this object is a
175	 * vdev_indirect_mapping_phys_t. This object is allocated when a vdev
176	 * removal is initiated.
177	 *
178	 * Note that this object can be empty if none of the data on the vdev
179	 * has been copied yet.
180	 */
181	uint64_t	vic_mapping_object;
182
183	/*
184	 * Object (in MOS) which contains the birth times for the mapping
185	 * entries. This object contains an array of
186	 * vdev_indirect_birth_entry_phys_t sorted by vibe_offset. The bonus
187	 * buffer for this object is a vdev_indirect_birth_phys_t. This object
188	 * is allocated when a vdev removal is initiated.
189	 *
190	 * Note that this object can be empty if none of the vdev has yet been
191	 * copied.
192	 */
193	uint64_t	vic_births_object;
194
195	/*
196	 * This is the vdev ID which was removed previous to this vdev, or
197	 * UINT64_MAX if there are no previously removed vdevs.
198	 */
199	uint64_t	vic_prev_indirect_vdev;
200} vdev_indirect_config_t;
201
202/*
203 * Virtual device descriptor
204 */
205struct vdev {
206	/*
207	 * Common to all vdev types.
208	 */
209	uint64_t	vdev_id;	/* child number in vdev parent	*/
210	uint64_t	vdev_guid;	/* unique ID for this vdev	*/
211	uint64_t	vdev_guid_sum;	/* self guid + all child guids	*/
212	uint64_t	vdev_orig_guid;	/* orig. guid prior to remove	*/
213	uint64_t	vdev_asize;	/* allocatable device capacity	*/
214	uint64_t	vdev_min_asize;	/* min acceptable asize		*/
215	uint64_t	vdev_max_asize;	/* max acceptable asize		*/
216	uint64_t	vdev_ashift;	/* block alignment shift	*/
217	uint64_t	vdev_state;	/* see VDEV_STATE_* #defines	*/
218	uint64_t	vdev_prevstate;	/* used when reopening a vdev	*/
219	vdev_ops_t	*vdev_ops;	/* vdev operations		*/
220	spa_t		*vdev_spa;	/* spa for this vdev		*/
221	void		*vdev_tsd;	/* type-specific data		*/
222	vnode_t		*vdev_name_vp;	/* vnode for pathname		*/
223	vnode_t		*vdev_devid_vp;	/* vnode for devid		*/
224	vdev_t		*vdev_top;	/* top-level vdev		*/
225	vdev_t		*vdev_parent;	/* parent vdev			*/
226	vdev_t		**vdev_child;	/* array of children		*/
227	uint64_t	vdev_children;	/* number of children		*/
228	vdev_stat_t	vdev_stat;	/* virtual device 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 */
235
236	/*
237	 * Top-level vdev state.
238	 */
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	txg_list_t	vdev_ms_list;	/* per-txg dirty metaslab lists	*/
245	txg_list_t	vdev_dtl_list;	/* per-txg dirty DTL lists	*/
246	txg_node_t	vdev_txg_node;	/* per-txg dirty vdev linkage	*/
247	boolean_t	vdev_remove_wanted; /* async remove wanted?	*/
248	boolean_t	vdev_probe_wanted; /* async probe wanted?	*/
249	list_node_t	vdev_config_dirty_node; /* config dirty list	*/
250	list_node_t	vdev_state_dirty_node; /* state dirty list	*/
251	uint64_t	vdev_deflate_ratio; /* deflation ratio (x512)	*/
252	uint64_t	vdev_islog;	/* is an intent log device	*/
253	uint64_t	vdev_removing;	/* device is being removed?	*/
254	boolean_t	vdev_ishole;	/* is a hole in the namespace	*/
255	uint64_t	vdev_top_zap;
256	vdev_alloc_bias_t vdev_alloc_bias; /* metaslab allocation bias	*/
257
258	/* pool checkpoint related */
259	space_map_t	*vdev_checkpoint_sm;	/* contains reserved blocks */
260
261	/* Initialize related */
262	boolean_t	vdev_initialize_exit_wanted;
263	vdev_initializing_state_t	vdev_initialize_state;
264	list_node_t	vdev_initialize_node;
265	kthread_t	*vdev_initialize_thread;
266	/* Protects vdev_initialize_thread and vdev_initialize_state. */
267	kmutex_t	vdev_initialize_lock;
268	kcondvar_t	vdev_initialize_cv;
269	uint64_t	vdev_initialize_offset[TXG_SIZE];
270	uint64_t	vdev_initialize_last_offset;
271	range_tree_t	*vdev_initialize_tree;	/* valid while initializing */
272	uint64_t	vdev_initialize_bytes_est;
273	uint64_t	vdev_initialize_bytes_done;
274	time_t		vdev_initialize_action_time;	/* start and end time */
275
276	/* TRIM related */
277	boolean_t	vdev_trim_exit_wanted;
278	boolean_t	vdev_autotrim_exit_wanted;
279	vdev_trim_state_t	vdev_trim_state;
280	list_node_t	vdev_trim_node;
281	kmutex_t	vdev_autotrim_lock;
282	kcondvar_t	vdev_autotrim_cv;
283	kthread_t	*vdev_autotrim_thread;
284	/* Protects vdev_trim_thread and vdev_trim_state. */
285	kmutex_t	vdev_trim_lock;
286	kcondvar_t	vdev_trim_cv;
287	kthread_t	*vdev_trim_thread;
288	uint64_t	vdev_trim_offset[TXG_SIZE];
289	uint64_t	vdev_trim_last_offset;
290	uint64_t	vdev_trim_bytes_est;
291	uint64_t	vdev_trim_bytes_done;
292	uint64_t	vdev_trim_rate;		/* requested rate (bytes/sec) */
293	uint64_t	vdev_trim_partial;	/* requested partial TRIM */
294	uint64_t	vdev_trim_secure;	/* requested secure TRIM */
295	time_t		vdev_trim_action_time;	/* start and end time */
296
297	/* The following is not in ZoL, but used for auto-trim test progress */
298	uint64_t	vdev_autotrim_bytes_done;
299
300	/* for limiting outstanding I/Os (initialize and TRIM) */
301	kmutex_t	vdev_initialize_io_lock;
302	kcondvar_t	vdev_initialize_io_cv;
303	uint64_t	vdev_initialize_inflight;
304	kmutex_t	vdev_trim_io_lock;
305	kcondvar_t	vdev_trim_io_cv;
306	uint64_t	vdev_trim_inflight[2];
307
308	/*
309	 * Values stored in the config for an indirect or removing vdev.
310	 */
311	vdev_indirect_config_t	vdev_indirect_config;
312
313	/*
314	 * The vdev_indirect_rwlock protects the vdev_indirect_mapping
315	 * pointer from changing on indirect vdevs (when it is condensed).
316	 * Note that removing (not yet indirect) vdevs have different
317	 * access patterns (the mapping is not accessed from open context,
318	 * e.g. from zio_read) and locking strategy (e.g. svr_lock).
319	 */
320	krwlock_t vdev_indirect_rwlock;
321	vdev_indirect_mapping_t *vdev_indirect_mapping;
322	vdev_indirect_births_t *vdev_indirect_births;
323
324	/*
325	 * In memory data structures used to manage the obsolete sm, for
326	 * indirect or removing vdevs.
327	 *
328	 * The vdev_obsolete_segments is the in-core record of the segments
329	 * that are no longer referenced anywhere in the pool (due to
330	 * being freed or remapped and not referenced by any snapshots).
331	 * During a sync, segments are added to vdev_obsolete_segments
332	 * via vdev_indirect_mark_obsolete(); at the end of each sync
333	 * pass, this is appended to vdev_obsolete_sm via
334	 * vdev_indirect_sync_obsolete().  The vdev_obsolete_lock
335	 * protects against concurrent modifications of vdev_obsolete_segments
336	 * from multiple zio threads.
337	 */
338	kmutex_t	vdev_obsolete_lock;
339	range_tree_t	*vdev_obsolete_segments;
340	space_map_t	*vdev_obsolete_sm;
341
342	/*
343	 * Protects the vdev_scan_io_queue field itself as well as the
344	 * structure's contents (when present).
345	 */
346	kmutex_t	vdev_scan_io_queue_lock;
347	struct dsl_scan_io_queue	*vdev_scan_io_queue;
348
349	/*
350	 * Leaf vdev state.
351	 */
352	range_tree_t	*vdev_dtl[DTL_TYPES]; /* dirty time logs	*/
353	space_map_t	*vdev_dtl_sm;	/* dirty time log space map	*/
354	txg_node_t	vdev_dtl_node;	/* per-txg dirty DTL linkage	*/
355	uint64_t	vdev_dtl_object; /* DTL object			*/
356	uint64_t	vdev_psize;	/* physical device capacity	*/
357	uint64_t	vdev_wholedisk;	/* true if this is a whole disk */
358	uint64_t	vdev_offline;	/* persistent offline state	*/
359	uint64_t	vdev_faulted;	/* persistent faulted state	*/
360	uint64_t	vdev_degraded;	/* persistent degraded state	*/
361	uint64_t	vdev_removed;	/* persistent removed state	*/
362	uint64_t	vdev_resilver_txg; /* persistent resilvering state */
363	uint64_t	vdev_nparity;	/* number of parity devices for raidz */
364	char		*vdev_path;	/* vdev path (if any)		*/
365	char		*vdev_devid;	/* vdev devid (if any)		*/
366	char		*vdev_physpath;	/* vdev device path (if any)	*/
367	char		*vdev_fru;	/* physical FRU location	*/
368	uint64_t	vdev_not_present; /* not present during import	*/
369	uint64_t	vdev_unspare;	/* unspare when resilvering done */
370	boolean_t	vdev_nowritecache; /* true if flushwritecache failed */
371	boolean_t	vdev_has_trim;	/* TRIM is supported		*/
372	boolean_t	vdev_has_securetrim; /* secure TRIM is supported */
373	boolean_t	vdev_checkremove; /* temporary online test	*/
374	boolean_t	vdev_forcefault; /* force online fault		*/
375	boolean_t	vdev_splitting;	/* split or repair in progress  */
376	boolean_t	vdev_delayed_close; /* delayed device close?	*/
377	boolean_t	vdev_tmpoffline; /* device taken offline temporarily? */
378	boolean_t	vdev_detached;	/* device detached?		*/
379	boolean_t	vdev_cant_read;	/* vdev is failing all reads	*/
380	boolean_t	vdev_cant_write; /* vdev is failing all writes	*/
381	boolean_t	vdev_isspare;	/* was a hot spare		*/
382	boolean_t	vdev_isl2cache;	/* was a l2cache device		*/
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	list_node_t	vdev_leaf_node;		/* leaf vdev list */
393
394	/*
395	 * For DTrace to work in userland (libzpool) context, these fields must
396	 * remain at the end of the structure.  DTrace will use the kernel's
397	 * CTF definition for 'struct vdev', and since the size of a kmutex_t is
398	 * larger in userland, the offsets for the rest of the fields would be
399	 * incorrect.
400	 */
401	kmutex_t	vdev_dtl_lock;	/* vdev_dtl_{map,resilver}	*/
402	kmutex_t	vdev_stat_lock;	/* vdev_stat			*/
403	kmutex_t	vdev_probe_lock; /* protects vdev_probe_zio	*/
404};
405
406#define	VDEV_RAIDZ_MAXPARITY	3
407
408#define	VDEV_PAD_SIZE		(8 << 10)
409/* 2 padding areas (vl_pad1 and vl_pad2) to skip */
410#define	VDEV_SKIP_SIZE		VDEV_PAD_SIZE * 2
411#define	VDEV_PHYS_SIZE		(112 << 10)
412#define	VDEV_UBERBLOCK_RING	(128 << 10)
413
414/*
415 * MMP blocks occupy the last MMP_BLOCKS_PER_LABEL slots in the uberblock
416 * ring when MMP is enabled.
417 */
418#define	MMP_BLOCKS_PER_LABEL	1
419
420/* The largest uberblock we support is 8k. */
421#define	MAX_UBERBLOCK_SHIFT (13)
422#define	VDEV_UBERBLOCK_SHIFT(vd)	\
423	MIN(MAX((vd)->vdev_top->vdev_ashift, UBERBLOCK_SHIFT), \
424	    MAX_UBERBLOCK_SHIFT)
425#define	VDEV_UBERBLOCK_COUNT(vd)	\
426	(VDEV_UBERBLOCK_RING >> VDEV_UBERBLOCK_SHIFT(vd))
427#define	VDEV_UBERBLOCK_OFFSET(vd, n)	\
428	offsetof(vdev_label_t, vl_uberblock[(n) << VDEV_UBERBLOCK_SHIFT(vd)])
429#define	VDEV_UBERBLOCK_SIZE(vd)		(1ULL << VDEV_UBERBLOCK_SHIFT(vd))
430
431typedef struct vdev_phys {
432	char		vp_nvlist[VDEV_PHYS_SIZE - sizeof (zio_eck_t)];
433	zio_eck_t	vp_zbt;
434} vdev_phys_t;
435
436typedef struct vdev_label {
437	char		vl_pad1[VDEV_PAD_SIZE];			/*  8K */
438	char		vl_pad2[VDEV_PAD_SIZE];			/*  8K */
439	vdev_phys_t	vl_vdev_phys;				/* 112K	*/
440	char		vl_uberblock[VDEV_UBERBLOCK_RING];	/* 128K	*/
441} vdev_label_t;							/* 256K total */
442
443/*
444 * vdev_dirty() flags
445 */
446#define	VDD_METASLAB	0x01
447#define	VDD_DTL		0x02
448
449/* Offset of embedded boot loader region on each label */
450#define	VDEV_BOOT_OFFSET	(2 * sizeof (vdev_label_t))
451/*
452 * Size of embedded boot loader region on each label.
453 * The total size of the first two labels plus the boot area is 4MB.
454 */
455#define	VDEV_BOOT_SIZE		(7ULL << 19)			/* 3.5M */
456
457/*
458 * Size of label regions at the start and end of each leaf device.
459 */
460#define	VDEV_LABEL_START_SIZE	(2 * sizeof (vdev_label_t) + VDEV_BOOT_SIZE)
461#define	VDEV_LABEL_END_SIZE	(2 * sizeof (vdev_label_t))
462#define	VDEV_LABELS		4
463#define	VDEV_BEST_LABEL		VDEV_LABELS
464
465#define	VDEV_ALLOC_LOAD		0
466#define	VDEV_ALLOC_ADD		1
467#define	VDEV_ALLOC_SPARE	2
468#define	VDEV_ALLOC_L2CACHE	3
469#define	VDEV_ALLOC_ROOTPOOL	4
470#define	VDEV_ALLOC_SPLIT	5
471#define	VDEV_ALLOC_ATTACH	6
472
473/*
474 * Allocate or free a vdev
475 */
476extern vdev_t *vdev_alloc_common(spa_t *spa, uint_t id, uint64_t guid,
477    vdev_ops_t *ops);
478extern int vdev_alloc(spa_t *spa, vdev_t **vdp, nvlist_t *config,
479    vdev_t *parent, uint_t id, int alloctype);
480extern void vdev_free(vdev_t *vd);
481
482/*
483 * Add or remove children and parents
484 */
485extern void vdev_add_child(vdev_t *pvd, vdev_t *cvd);
486extern void vdev_remove_child(vdev_t *pvd, vdev_t *cvd);
487extern void vdev_compact_children(vdev_t *pvd);
488extern vdev_t *vdev_add_parent(vdev_t *cvd, vdev_ops_t *ops);
489extern void vdev_remove_parent(vdev_t *cvd);
490
491/*
492 * vdev sync load and sync
493 */
494extern boolean_t vdev_log_state_valid(vdev_t *vd);
495extern int vdev_load(vdev_t *vd);
496extern int vdev_dtl_load(vdev_t *vd);
497extern void vdev_sync(vdev_t *vd, uint64_t txg);
498extern void vdev_sync_done(vdev_t *vd, uint64_t txg);
499extern void vdev_dirty(vdev_t *vd, int flags, void *arg, uint64_t txg);
500extern void vdev_dirty_leaves(vdev_t *vd, int flags, uint64_t txg);
501
502/*
503 * Available vdev types.
504 */
505extern vdev_ops_t vdev_root_ops;
506extern vdev_ops_t vdev_mirror_ops;
507extern vdev_ops_t vdev_replacing_ops;
508extern vdev_ops_t vdev_raidz_ops;
509extern vdev_ops_t vdev_disk_ops;
510extern vdev_ops_t vdev_file_ops;
511extern vdev_ops_t vdev_missing_ops;
512extern vdev_ops_t vdev_hole_ops;
513extern vdev_ops_t vdev_spare_ops;
514extern vdev_ops_t vdev_indirect_ops;
515
516/*
517 * Common size functions
518 */
519extern void vdev_default_xlate(vdev_t *vd, const range_seg_t *in,
520    range_seg_t *out);
521extern uint64_t vdev_default_asize(vdev_t *vd, uint64_t psize);
522extern uint64_t vdev_get_min_asize(vdev_t *vd);
523extern void vdev_set_min_asize(vdev_t *vd);
524
525/*
526 * Global variables
527 */
528extern int zfs_vdev_standard_sm_blksz;
529/* zdb uses this tunable, so it must be declared here to make lint happy. */
530extern int zfs_vdev_cache_size;
531
532/*
533 * Functions from vdev_indirect.c
534 */
535extern void vdev_indirect_sync_obsolete(vdev_t *vd, dmu_tx_t *tx);
536extern boolean_t vdev_indirect_should_condense(vdev_t *vd);
537extern void spa_condense_indirect_start_sync(vdev_t *vd, dmu_tx_t *tx);
538extern int vdev_obsolete_sm_object(vdev_t *vd);
539extern boolean_t vdev_obsolete_counts_are_precise(vdev_t *vd);
540
541/*
542 * Other miscellaneous functions
543 */
544int vdev_checkpoint_sm_object(vdev_t *vd);
545
546/*
547 * The vdev_buf_t is used to translate between zio_t and buf_t, and back again.
548 */
549typedef struct vdev_buf {
550	buf_t	vb_buf;		/* buffer that describes the io */
551	zio_t	*vb_io;		/* pointer back to the original zio_t */
552} vdev_buf_t;
553
554#ifdef	__cplusplus
555}
556#endif
557
558#endif	/* _SYS_VDEV_IMPL_H */
559