[mirror_zfs.git] / module / zfs / include / sys / vdev_impl.h

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
 */

#ifndef _SYS_VDEV_IMPL_H
#define	_SYS_VDEV_IMPL_H

#include <sys/avl.h>
#include <sys/dmu.h>
#include <sys/metaslab.h>
#include <sys/nvpair.h>
#include <sys/space_map.h>
#include <sys/vdev.h>
#include <sys/dkio.h>
#include <sys/uberblock_impl.h>

#ifdef	__cplusplus
extern "C" {
#endif

/*
 * Virtual device descriptors.
 *
 * All storage pool operations go through the virtual device framework,
 * which provides data replication and I/O scheduling.
 */

/*
 * Forward declarations that lots of things need.
 */
typedef struct vdev_queue vdev_queue_t;
typedef struct vdev_cache vdev_cache_t;
typedef struct vdev_cache_entry vdev_cache_entry_t;

/*
 * Virtual device operations
 */
typedef int	vdev_open_func_t(vdev_t *vd, uint64_t *size, uint64_t *ashift);
typedef void	vdev_close_func_t(vdev_t *vd);
typedef uint64_t vdev_asize_func_t(vdev_t *vd, uint64_t psize);
typedef int	vdev_io_start_func_t(zio_t *zio);
typedef void	vdev_io_done_func_t(zio_t *zio);
typedef void	vdev_state_change_func_t(vdev_t *vd, int, int);
typedef void	vdev_hold_func_t(vdev_t *vd);
typedef void	vdev_rele_func_t(vdev_t *vd);

typedef struct vdev_ops {
	vdev_open_func_t		*vdev_op_open;
	vdev_close_func_t		*vdev_op_close;
	vdev_asize_func_t		*vdev_op_asize;
	vdev_io_start_func_t		*vdev_op_io_start;
	vdev_io_done_func_t		*vdev_op_io_done;
	vdev_state_change_func_t	*vdev_op_state_change;
	vdev_hold_func_t		*vdev_op_hold;
	vdev_rele_func_t		*vdev_op_rele;
	char				vdev_op_type[16];
	boolean_t			vdev_op_leaf;
} vdev_ops_t;

/*
 * Virtual device properties
 */
struct vdev_cache_entry {
	char		*ve_data;
	uint64_t	ve_offset;
	uint64_t	ve_lastused;
	avl_node_t	ve_offset_node;
	avl_node_t	ve_lastused_node;
	uint32_t	ve_hits;
	uint16_t	ve_missed_update;
	zio_t		*ve_fill_io;
};

struct vdev_cache {
	avl_tree_t	vc_offset_tree;
	avl_tree_t	vc_lastused_tree;
	kmutex_t	vc_lock;
};

struct vdev_queue {
	avl_tree_t	vq_deadline_tree;
	avl_tree_t	vq_read_tree;
	avl_tree_t	vq_write_tree;
	avl_tree_t	vq_pending_tree;
	kmutex_t	vq_lock;
};

/*
 * Virtual device descriptor
 */
struct vdev {
	/*
	 * Common to all vdev types.
	 */
	uint64_t	vdev_id;	/* child number in vdev parent	*/
	uint64_t	vdev_guid;	/* unique ID for this vdev	*/
	uint64_t	vdev_guid_sum;	/* self guid + all child guids	*/
	uint64_t	vdev_orig_guid;	/* orig. guid prior to remove	*/
	uint64_t	vdev_asize;	/* allocatable device capacity	*/
	uint64_t	vdev_min_asize;	/* min acceptable asize		*/
	uint64_t	vdev_ashift;	/* block alignment shift	*/
	uint64_t	vdev_state;	/* see VDEV_STATE_* #defines	*/
	uint64_t	vdev_prevstate;	/* used when reopening a vdev	*/
	vdev_ops_t	*vdev_ops;	/* vdev operations		*/
	spa_t		*vdev_spa;	/* spa for this vdev		*/
	void		*vdev_tsd;	/* type-specific data		*/
	vnode_t		*vdev_name_vp;	/* vnode for pathname		*/
	vnode_t		*vdev_devid_vp;	/* vnode for devid		*/
	vdev_t		*vdev_top;	/* top-level vdev		*/
	vdev_t		*vdev_parent;	/* parent vdev			*/
	vdev_t		**vdev_child;	/* array of children		*/
	uint64_t	vdev_children;	/* number of children		*/
	space_map_t	vdev_dtl[DTL_TYPES]; /* in-core dirty time logs	*/
	vdev_stat_t	vdev_stat;	/* virtual device statistics	*/
	boolean_t	vdev_expanding;	/* expand the vdev?		*/
	boolean_t	vdev_reopening;	/* reopen in progress?		*/
	int		vdev_open_error; /* error on last open		*/
	kthread_t	*vdev_open_thread; /* thread opening children	*/
	uint64_t	vdev_crtxg;	/* txg when top-level was added */

	/*
	 * Top-level vdev state.
	 */
	uint64_t	vdev_ms_array;	/* metaslab array object	*/
	uint64_t	vdev_ms_shift;	/* metaslab size shift		*/
	uint64_t	vdev_ms_count;	/* number of metaslabs		*/
	metaslab_group_t *vdev_mg;	/* metaslab group		*/
	metaslab_t	**vdev_ms;	/* metaslab array		*/
	txg_list_t	vdev_ms_list;	/* per-txg dirty metaslab lists	*/
	txg_list_t	vdev_dtl_list;	/* per-txg dirty DTL lists	*/
	txg_node_t	vdev_txg_node;	/* per-txg dirty vdev linkage	*/
	boolean_t	vdev_remove_wanted; /* async remove wanted?	*/
	boolean_t	vdev_probe_wanted; /* async probe wanted?	*/
	uint64_t	vdev_removing;	/* device is being removed?	*/
	list_node_t	vdev_config_dirty_node; /* config dirty list	*/
	list_node_t	vdev_state_dirty_node; /* state dirty list	*/
	uint64_t	vdev_deflate_ratio; /* deflation ratio (x512)	*/
	uint64_t	vdev_islog;	/* is an intent log device	*/
	uint64_t	vdev_ishole;	/* is a hole in the namespace 	*/

	/*
	 * Leaf vdev state.
	 */
	uint64_t	vdev_psize;	/* physical device capacity	*/
	space_map_obj_t	vdev_dtl_smo;	/* dirty time log space map obj	*/
	txg_node_t	vdev_dtl_node;	/* per-txg dirty DTL linkage	*/
	uint64_t	vdev_wholedisk;	/* true if this is a whole disk */
	uint64_t	vdev_offline;	/* persistent offline state	*/
	uint64_t	vdev_faulted;	/* persistent faulted state	*/
	uint64_t	vdev_degraded;	/* persistent degraded state	*/
	uint64_t	vdev_removed;	/* persistent removed state	*/
	uint64_t	vdev_resilvering; /* persistent resilvering state */
	uint64_t	vdev_nparity;	/* number of parity devices for raidz */
	char		*vdev_path;	/* vdev path (if any)		*/
	char		*vdev_devid;	/* vdev devid (if any)		*/
	char		*vdev_physpath;	/* vdev device path (if any)	*/
	char		*vdev_fru;	/* physical FRU location	*/
	uint64_t	vdev_not_present; /* not present during import	*/
	uint64_t	vdev_unspare;	/* unspare when resilvering done */
	hrtime_t	vdev_last_try;	/* last reopen time		*/
	boolean_t	vdev_nowritecache; /* true if flushwritecache failed */
	boolean_t	vdev_checkremove; /* temporary online test	*/
	boolean_t	vdev_forcefault; /* force online fault		*/
	boolean_t	vdev_splitting;	/* split or repair in progress  */
	boolean_t	vdev_delayed_close; /* delayed device close?	*/
	uint8_t		vdev_tmpoffline; /* device taken offline temporarily? */
	uint8_t		vdev_detached;	/* device detached?		*/
	uint8_t		vdev_cant_read;	/* vdev is failing all reads	*/
	uint8_t		vdev_cant_write; /* vdev is failing all writes	*/
	uint64_t	vdev_isspare;	/* was a hot spare		*/
	uint64_t	vdev_isl2cache;	/* was a l2cache device		*/
	vdev_queue_t	vdev_queue;	/* I/O deadline schedule queue	*/
	vdev_cache_t	vdev_cache;	/* physical block cache		*/
	spa_aux_vdev_t	*vdev_aux;	/* for l2cache vdevs		*/
	zio_t		*vdev_probe_zio; /* root of current probe	*/
	vdev_aux_t	vdev_label_aux;	/* on-disk aux state		*/

	/*
	 * For DTrace to work in userland (libzpool) context, these fields must
	 * remain at the end of the structure.  DTrace will use the kernel's
	 * CTF definition for 'struct vdev', and since the size of a kmutex_t is
	 * larger in userland, the offsets for the rest fields would be
	 * incorrect.
	 */
	kmutex_t	vdev_dtl_lock;	/* vdev_dtl_{map,resilver}	*/
	kmutex_t	vdev_stat_lock;	/* vdev_stat			*/
	kmutex_t	vdev_probe_lock; /* protects vdev_probe_zio	*/
};

#define	VDEV_RAIDZ_MAXPARITY	3

#define	VDEV_PAD_SIZE		(8 << 10)
/* 2 padding areas (vl_pad1 and vl_pad2) to skip */
#define	VDEV_SKIP_SIZE		VDEV_PAD_SIZE * 2
#define	VDEV_PHYS_SIZE		(112 << 10)
#define	VDEV_UBERBLOCK_RING	(128 << 10)

#define	VDEV_UBERBLOCK_SHIFT(vd)	\
	MAX((vd)->vdev_top->vdev_ashift, UBERBLOCK_SHIFT)
#define	VDEV_UBERBLOCK_COUNT(vd)	\
	(VDEV_UBERBLOCK_RING >> VDEV_UBERBLOCK_SHIFT(vd))
#define	VDEV_UBERBLOCK_OFFSET(vd, n)	\
	offsetof(vdev_label_t, vl_uberblock[(n) << VDEV_UBERBLOCK_SHIFT(vd)])
#define	VDEV_UBERBLOCK_SIZE(vd)		(1ULL << VDEV_UBERBLOCK_SHIFT(vd))

typedef struct vdev_phys {
	char		vp_nvlist[VDEV_PHYS_SIZE - sizeof (zio_eck_t)];
	zio_eck_t	vp_zbt;
} vdev_phys_t;

typedef struct vdev_label {
	char		vl_pad1[VDEV_PAD_SIZE];			/*  8K */
	char		vl_pad2[VDEV_PAD_SIZE];			/*  8K */
	vdev_phys_t	vl_vdev_phys;				/* 112K	*/
	char		vl_uberblock[VDEV_UBERBLOCK_RING];	/* 128K	*/
} vdev_label_t;							/* 256K total */

/*
 * vdev_dirty() flags
 */
#define	VDD_METASLAB	0x01
#define	VDD_DTL		0x02

/*
 * Size and offset of embedded boot loader region on each label.
 * The total size of the first two labels plus the boot area is 4MB.
 */
#define	VDEV_BOOT_OFFSET	(2 * sizeof (vdev_label_t))
#define	VDEV_BOOT_SIZE		(7ULL << 19)			/* 3.5M	*/

/*
 * Size of label regions at the start and end of each leaf device.
 */
#define	VDEV_LABEL_START_SIZE	(2 * sizeof (vdev_label_t) + VDEV_BOOT_SIZE)
#define	VDEV_LABEL_END_SIZE	(2 * sizeof (vdev_label_t))
#define	VDEV_LABELS		4

#define	VDEV_ALLOC_LOAD		0
#define	VDEV_ALLOC_ADD		1
#define	VDEV_ALLOC_SPARE	2
#define	VDEV_ALLOC_L2CACHE	3
#define	VDEV_ALLOC_ROOTPOOL	4
#define	VDEV_ALLOC_SPLIT	5

/*
 * Allocate or free a vdev
 */
extern vdev_t *vdev_alloc_common(spa_t *spa, uint_t id, uint64_t guid,
    vdev_ops_t *ops);
extern int vdev_alloc(spa_t *spa, vdev_t **vdp, nvlist_t *config,
    vdev_t *parent, uint_t id, int alloctype);
extern void vdev_free(vdev_t *vd);

/*
 * Add or remove children and parents
 */
extern void vdev_add_child(vdev_t *pvd, vdev_t *cvd);
extern void vdev_remove_child(vdev_t *pvd, vdev_t *cvd);
extern void vdev_compact_children(vdev_t *pvd);
extern vdev_t *vdev_add_parent(vdev_t *cvd, vdev_ops_t *ops);
extern void vdev_remove_parent(vdev_t *cvd);

/*
 * vdev sync load and sync
 */
extern void vdev_load_log_state(vdev_t *nvd, vdev_t *ovd);
extern boolean_t vdev_log_state_valid(vdev_t *vd);
extern void vdev_load(vdev_t *vd);
extern void vdev_sync(vdev_t *vd, uint64_t txg);
extern void vdev_sync_done(vdev_t *vd, uint64_t txg);
extern void vdev_dirty(vdev_t *vd, int flags, void *arg, uint64_t txg);

/*
 * Available vdev types.
 */
extern vdev_ops_t vdev_root_ops;
extern vdev_ops_t vdev_mirror_ops;
extern vdev_ops_t vdev_replacing_ops;
extern vdev_ops_t vdev_raidz_ops;
extern vdev_ops_t vdev_disk_ops;
extern vdev_ops_t vdev_file_ops;
extern vdev_ops_t vdev_missing_ops;
extern vdev_ops_t vdev_hole_ops;
extern vdev_ops_t vdev_spare_ops;

/*
 * Common size functions
 */
extern uint64_t vdev_default_asize(vdev_t *vd, uint64_t psize);
extern uint64_t vdev_get_min_asize(vdev_t *vd);
extern void vdev_set_min_asize(vdev_t *vd);

/*
 * zdb uses this tunable, so it must be declared here to make lint happy.
 */
extern int zfs_vdev_cache_size;

#ifdef	__cplusplus
}
#endif

#endif	/* _SYS_VDEV_IMPL_H */
Commit	Line	Data
34dc7c2f BB	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	/*
428870ff	22	* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
34dc7c2f BB	23	*/
	24
	25	#ifndef _SYS_VDEV_IMPL_H
	26	#define _SYS_VDEV_IMPL_H
	27
34dc7c2f BB	28	#include <sys/avl.h>
	29	#include <sys/dmu.h>
	30	#include <sys/metaslab.h>
	31	#include <sys/nvpair.h>
	32	#include <sys/space_map.h>
	33	#include <sys/vdev.h>
	34	#include <sys/dkio.h>
	35	#include <sys/uberblock_impl.h>
	36
	37	#ifdef __cplusplus
	38	extern "C" {
	39	#endif
	40
	41	/*
	42	* Virtual device descriptors.
	43	*
	44	* All storage pool operations go through the virtual device framework,
	45	* which provides data replication and I/O scheduling.
	46	*/
	47
	48	/*
	49	* Forward declarations that lots of things need.
	50	*/
	51	typedef struct vdev_queue vdev_queue_t;
	52	typedef struct vdev_cache vdev_cache_t;
	53	typedef struct vdev_cache_entry vdev_cache_entry_t;
	54
	55	/*
	56	* Virtual device operations
	57	*/
	58	typedef int vdev_open_func_t(vdev_t vd, uint64_t size, uint64_t *ashift);
	59	typedef void vdev_close_func_t(vdev_t *vd);
34dc7c2f BB	60	typedef uint64_t vdev_asize_func_t(vdev_t *vd, uint64_t psize);
34dc7c2f BB	61	typedef int vdev_io_start_func_t(zio_t *zio);
b128c09f	62	typedef void vdev_io_done_func_t(zio_t *zio);
34dc7c2f	63	typedef void vdev_state_change_func_t(vdev_t *vd, int, int);
428870ff BB	64	typedef void vdev_hold_func_t(vdev_t *vd);
428870ff BB	65	typedef void vdev_rele_func_t(vdev_t *vd);
34dc7c2f BB	66
	67	typedef struct vdev_ops {
	68	vdev_open_func_t *vdev_op_open;
	69	vdev_close_func_t *vdev_op_close;
34dc7c2f BB	70	vdev_asize_func_t *vdev_op_asize;
	71	vdev_io_start_func_t *vdev_op_io_start;
	72	vdev_io_done_func_t *vdev_op_io_done;
	73	vdev_state_change_func_t *vdev_op_state_change;
428870ff BB	74	vdev_hold_func_t *vdev_op_hold;
428870ff BB	75	vdev_rele_func_t *vdev_op_rele;
34dc7c2f BB	76	char vdev_op_type[16];
	77	boolean_t vdev_op_leaf;
	78	} vdev_ops_t;
	79
	80	/*
	81	* Virtual device properties
	82	*/
	83	struct vdev_cache_entry {
	84	char *ve_data;
	85	uint64_t ve_offset;
	86	uint64_t ve_lastused;
	87	avl_node_t ve_offset_node;
	88	avl_node_t ve_lastused_node;
	89	uint32_t ve_hits;
	90	uint16_t ve_missed_update;
	91	zio_t *ve_fill_io;
	92	};
	93
	94	struct vdev_cache {
	95	avl_tree_t vc_offset_tree;
	96	avl_tree_t vc_lastused_tree;
	97	kmutex_t vc_lock;
	98	};
	99
	100	struct vdev_queue {
	101	avl_tree_t vq_deadline_tree;
	102	avl_tree_t vq_read_tree;
	103	avl_tree_t vq_write_tree;
	104	avl_tree_t vq_pending_tree;
	105	kmutex_t vq_lock;
	106	};
	107
	108	/*
	109	* Virtual device descriptor
	110	*/
	111	struct vdev {
	112	/*
	113	* Common to all vdev types.
	114	*/
	115	uint64_t vdev_id; /* child number in vdev parent */
	116	uint64_t vdev_guid; /* unique ID for this vdev */
	117	uint64_t vdev_guid_sum; /* self guid + all child guids */
428870ff	118	uint64_t vdev_orig_guid; /* orig. guid prior to remove */
34dc7c2f	119	uint64_t vdev_asize; /* allocatable device capacity */
9babb374	120	uint64_t vdev_min_asize; /* min acceptable asize */
34dc7c2f BB	121	uint64_t vdev_ashift; /* block alignment shift */
	122	uint64_t vdev_state; /* see VDEV_STATE_* #defines */
	123	uint64_t vdev_prevstate; /* used when reopening a vdev */
	124	vdev_ops_t vdev_ops; / vdev operations */
	125	spa_t vdev_spa; / spa for this vdev */
	126	void vdev_tsd; / type-specific data */
428870ff BB	127	vnode_t vdev_name_vp; / vnode for pathname */
428870ff BB	128	vnode_t vdev_devid_vp; / vnode for devid */
34dc7c2f BB	129	vdev_t vdev_top; / top-level vdev */
	130	vdev_t vdev_parent; / parent vdev */
	131	vdev_t *vdev_child; / array of children */
	132	uint64_t vdev_children; /* number of children */
fb5f0bc8	133	space_map_t vdev_dtl[DTL_TYPES]; /* in-core dirty time logs */
34dc7c2f	134	vdev_stat_t vdev_stat; /* virtual device statistics */
9babb374	135	boolean_t vdev_expanding; /* expand the vdev? */
428870ff	136	boolean_t vdev_reopening; /* reopen in progress? */
45d1cae3 BB	137	int vdev_open_error; /* error on last open */
45d1cae3 BB	138	kthread_t vdev_open_thread; / thread opening children */
428870ff	139	uint64_t vdev_crtxg; /* txg when top-level was added */
34dc7c2f BB	140
	141	/*
	142	* Top-level vdev state.
	143	*/
	144	uint64_t vdev_ms_array; /* metaslab array object */
	145	uint64_t vdev_ms_shift; /* metaslab size shift */
	146	uint64_t vdev_ms_count; /* number of metaslabs */
	147	metaslab_group_t vdev_mg; / metaslab group */
	148	metaslab_t *vdev_ms; / metaslab array */
	149	txg_list_t vdev_ms_list; /* per-txg dirty metaslab lists */
	150	txg_list_t vdev_dtl_list; /* per-txg dirty DTL lists */
	151	txg_node_t vdev_txg_node; /* per-txg dirty vdev linkage */
	152	boolean_t vdev_remove_wanted; /* async remove wanted? */
b128c09f	153	boolean_t vdev_probe_wanted; /* async probe wanted? */
428870ff	154	uint64_t vdev_removing; /* device is being removed? */
b128c09f BB	155	list_node_t vdev_config_dirty_node; /* config dirty list */
b128c09f BB	156	list_node_t vdev_state_dirty_node; /* state dirty list */
34dc7c2f BB	157	uint64_t vdev_deflate_ratio; /* deflation ratio (x512) */
34dc7c2f BB	158	uint64_t vdev_islog; /* is an intent log device */
428870ff	159	uint64_t vdev_ishole; /* is a hole in the namespace */
34dc7c2f BB	160
	161	/*
	162	* Leaf vdev state.
	163	*/
	164	uint64_t vdev_psize; /* physical device capacity */
fb5f0bc8	165	space_map_obj_t vdev_dtl_smo; /* dirty time log space map obj */
34dc7c2f BB	166	txg_node_t vdev_dtl_node; /* per-txg dirty DTL linkage */
	167	uint64_t vdev_wholedisk; /* true if this is a whole disk */
	168	uint64_t vdev_offline; /* persistent offline state */
	169	uint64_t vdev_faulted; /* persistent faulted state */
	170	uint64_t vdev_degraded; /* persistent degraded state */
	171	uint64_t vdev_removed; /* persistent removed state */
572e2857	172	uint64_t vdev_resilvering; /* persistent resilvering state */
34dc7c2f BB	173	uint64_t vdev_nparity; /* number of parity devices for raidz */
	174	char vdev_path; / vdev path (if any) */
	175	char vdev_devid; / vdev devid (if any) */
	176	char vdev_physpath; / vdev device path (if any) */
9babb374	177	char vdev_fru; / physical FRU location */
b128c09f BB	178	uint64_t vdev_not_present; /* not present during import */
	179	uint64_t vdev_unspare; /* unspare when resilvering done */
	180	hrtime_t vdev_last_try; /* last reopen time */
	181	boolean_t vdev_nowritecache; /* true if flushwritecache failed */
	182	boolean_t vdev_checkremove; /* temporary online test */
	183	boolean_t vdev_forcefault; /* force online fault */
428870ff BB	184	boolean_t vdev_splitting; /* split or repair in progress */
428870ff BB	185	boolean_t vdev_delayed_close; /* delayed device close? */
34dc7c2f BB	186	uint8_t vdev_tmpoffline; /* device taken offline temporarily? */
34dc7c2f BB	187	uint8_t vdev_detached; /* device detached? */
b128c09f BB	188	uint8_t vdev_cant_read; /* vdev is failing all reads */
b128c09f BB	189	uint8_t vdev_cant_write; /* vdev is failing all writes */
34dc7c2f BB	190	uint64_t vdev_isspare; /* was a hot spare */
	191	uint64_t vdev_isl2cache; /* was a l2cache device */
	192	vdev_queue_t vdev_queue; /* I/O deadline schedule queue */
	193	vdev_cache_t vdev_cache; /* physical block cache */
b128c09f BB	194	spa_aux_vdev_t vdev_aux; / for l2cache vdevs */
b128c09f BB	195	zio_t vdev_probe_zio; / root of current probe */
428870ff	196	vdev_aux_t vdev_label_aux; /* on-disk aux state */
34dc7c2f BB	197
	198	/*
	199	* For DTrace to work in userland (libzpool) context, these fields must
	200	* remain at the end of the structure. DTrace will use the kernel's
	201	* CTF definition for 'struct vdev', and since the size of a kmutex_t is
	202	* larger in userland, the offsets for the rest fields would be
	203	* incorrect.
	204	*/
	205	kmutex_t vdev_dtl_lock; /* vdev_dtl_{map,resilver} */
	206	kmutex_t vdev_stat_lock; /* vdev_stat */
b128c09f	207	kmutex_t vdev_probe_lock; /* protects vdev_probe_zio */
34dc7c2f BB	208	};
34dc7c2f BB	209
428870ff BB	210	#define VDEV_RAIDZ_MAXPARITY 3
428870ff BB	211
9babb374 BB	212	#define VDEV_PAD_SIZE (8 << 10)
	213	/* 2 padding areas (vl_pad1 and vl_pad2) to skip */
	214	#define VDEV_SKIP_SIZE VDEV_PAD_SIZE * 2
34dc7c2f BB	215	#define VDEV_PHYS_SIZE (112 << 10)
	216	#define VDEV_UBERBLOCK_RING (128 << 10)
	217
	218	#define VDEV_UBERBLOCK_SHIFT(vd) \
	219	MAX((vd)->vdev_top->vdev_ashift, UBERBLOCK_SHIFT)
	220	#define VDEV_UBERBLOCK_COUNT(vd) \
	221	(VDEV_UBERBLOCK_RING >> VDEV_UBERBLOCK_SHIFT(vd))
	222	#define VDEV_UBERBLOCK_OFFSET(vd, n) \
	223	offsetof(vdev_label_t, vl_uberblock[(n) << VDEV_UBERBLOCK_SHIFT(vd)])
	224	#define VDEV_UBERBLOCK_SIZE(vd) (1ULL << VDEV_UBERBLOCK_SHIFT(vd))
	225
34dc7c2f	226	typedef struct vdev_phys {
428870ff BB	227	char vp_nvlist[VDEV_PHYS_SIZE - sizeof (zio_eck_t)];
428870ff BB	228	zio_eck_t vp_zbt;
34dc7c2f BB	229	} vdev_phys_t;
	230
	231	typedef struct vdev_label {
9babb374 BB	232	char vl_pad1[VDEV_PAD_SIZE]; /* 8K */
9babb374 BB	233	char vl_pad2[VDEV_PAD_SIZE]; /* 8K */
34dc7c2f BB	234	vdev_phys_t vl_vdev_phys; /* 112K */
	235	char vl_uberblock[VDEV_UBERBLOCK_RING]; /* 128K */
	236	} vdev_label_t; /* 256K total */
	237
	238	/*
	239	* vdev_dirty() flags
	240	*/
	241	#define VDD_METASLAB 0x01
	242	#define VDD_DTL 0x02
	243
	244	/*
	245	* Size and offset of embedded boot loader region on each label.
	246	* The total size of the first two labels plus the boot area is 4MB.
	247	*/
	248	#define VDEV_BOOT_OFFSET (2 * sizeof (vdev_label_t))
	249	#define VDEV_BOOT_SIZE (7ULL << 19) /* 3.5M */
	250
	251	/*
	252	* Size of label regions at the start and end of each leaf device.
	253	*/
	254	#define VDEV_LABEL_START_SIZE (2 * sizeof (vdev_label_t) + VDEV_BOOT_SIZE)
	255	#define VDEV_LABEL_END_SIZE (2 * sizeof (vdev_label_t))
	256	#define VDEV_LABELS 4
	257
	258	#define VDEV_ALLOC_LOAD 0
	259	#define VDEV_ALLOC_ADD 1
	260	#define VDEV_ALLOC_SPARE 2
	261	#define VDEV_ALLOC_L2CACHE 3
9babb374	262	#define VDEV_ALLOC_ROOTPOOL 4
428870ff	263	#define VDEV_ALLOC_SPLIT 5
34dc7c2f BB	264
	265	/*
	266	* Allocate or free a vdev
	267	*/
428870ff BB	268	extern vdev_t vdev_alloc_common(spa_t spa, uint_t id, uint64_t guid,
428870ff BB	269	vdev_ops_t *ops);
34dc7c2f BB	270	extern int vdev_alloc(spa_t spa, vdev_t vdp, nvlist_t config,
	271	vdev_t *parent, uint_t id, int alloctype);
	272	extern void vdev_free(vdev_t *vd);
	273
	274	/*
	275	* Add or remove children and parents
	276	*/
	277	extern void vdev_add_child(vdev_t pvd, vdev_t cvd);
	278	extern void vdev_remove_child(vdev_t pvd, vdev_t cvd);
	279	extern void vdev_compact_children(vdev_t *pvd);
	280	extern vdev_t vdev_add_parent(vdev_t cvd, vdev_ops_t *ops);
	281	extern void vdev_remove_parent(vdev_t *cvd);
	282
	283	/*
	284	* vdev sync load and sync
	285	*/
428870ff	286	extern void vdev_load_log_state(vdev_t nvd, vdev_t ovd);
572e2857	287	extern boolean_t vdev_log_state_valid(vdev_t *vd);
34dc7c2f BB	288	extern void vdev_load(vdev_t *vd);
	289	extern void vdev_sync(vdev_t *vd, uint64_t txg);
	290	extern void vdev_sync_done(vdev_t *vd, uint64_t txg);
	291	extern void vdev_dirty(vdev_t vd, int flags, void arg, uint64_t txg);
	292
	293	/*
	294	* Available vdev types.
	295	*/
	296	extern vdev_ops_t vdev_root_ops;
	297	extern vdev_ops_t vdev_mirror_ops;
	298	extern vdev_ops_t vdev_replacing_ops;
	299	extern vdev_ops_t vdev_raidz_ops;
	300	extern vdev_ops_t vdev_disk_ops;
	301	extern vdev_ops_t vdev_file_ops;
	302	extern vdev_ops_t vdev_missing_ops;
428870ff	303	extern vdev_ops_t vdev_hole_ops;
34dc7c2f BB	304	extern vdev_ops_t vdev_spare_ops;
	305
	306	/*
	307	* Common size functions
	308	*/
	309	extern uint64_t vdev_default_asize(vdev_t *vd, uint64_t psize);
9babb374 BB	310	extern uint64_t vdev_get_min_asize(vdev_t *vd);
9babb374 BB	311	extern void vdev_set_min_asize(vdev_t *vd);
34dc7c2f BB	312
	313	/*
	314	* zdb uses this tunable, so it must be declared here to make lint happy.
	315	*/
	316	extern int zfs_vdev_cache_size;
	317
	318	#ifdef __cplusplus
	319	}
	320	#endif
	321
	322	#endif /* _SYS_VDEV_IMPL_H */