[mirror_ubuntu-bionic-kernel.git] / zfs / include / sys / spa_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.
 * Copyright (c) 2011, 2015 by Delphix. All rights reserved.
 * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
 * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
 * Copyright (c) 2016 Actifio, Inc. All rights reserved.
 */

#ifndef _SYS_SPA_IMPL_H
#define	_SYS_SPA_IMPL_H

#include <sys/spa.h>
#include <sys/vdev.h>
#include <sys/metaslab.h>
#include <sys/dmu.h>
#include <sys/dsl_pool.h>
#include <sys/uberblock_impl.h>
#include <sys/zfs_context.h>
#include <sys/avl.h>
#include <sys/refcount.h>
#include <sys/bplist.h>
#include <sys/bpobj.h>
#include <sys/zfeature.h>
#include <zfeature_common.h>

#ifdef	__cplusplus
extern "C" {
#endif

typedef struct spa_error_entry {
	zbookmark_phys_t	se_bookmark;
	char			*se_name;
	avl_node_t		se_avl;
} spa_error_entry_t;

typedef struct spa_history_phys {
	uint64_t sh_pool_create_len;	/* ending offset of zpool create */
	uint64_t sh_phys_max_off;	/* physical EOF */
	uint64_t sh_bof;		/* logical BOF */
	uint64_t sh_eof;		/* logical EOF */
	uint64_t sh_records_lost;	/* num of records overwritten */
} spa_history_phys_t;

struct spa_aux_vdev {
	uint64_t	sav_object;		/* MOS object for device list */
	nvlist_t	*sav_config;		/* cached device config */
	vdev_t		**sav_vdevs;		/* devices */
	int		sav_count;		/* number devices */
	boolean_t	sav_sync;		/* sync the device list */
	nvlist_t	**sav_pending;		/* pending device additions */
	uint_t		sav_npending;		/* # pending devices */
};

typedef struct spa_config_lock {
	kmutex_t	scl_lock;
	kthread_t	*scl_writer;
	int		scl_write_wanted;
	kcondvar_t	scl_cv;
	refcount_t	scl_count;
} spa_config_lock_t;

typedef struct spa_config_dirent {
	list_node_t	scd_link;
	char		*scd_path;
} spa_config_dirent_t;

typedef enum zio_taskq_type {
	ZIO_TASKQ_ISSUE = 0,
	ZIO_TASKQ_ISSUE_HIGH,
	ZIO_TASKQ_INTERRUPT,
	ZIO_TASKQ_INTERRUPT_HIGH,
	ZIO_TASKQ_TYPES
} zio_taskq_type_t;

/*
 * State machine for the zpool-poolname process.  The states transitions
 * are done as follows:
 *
 *	From		   To			Routine
 *	PROC_NONE	-> PROC_CREATED		spa_activate()
 *	PROC_CREATED	-> PROC_ACTIVE		spa_thread()
 *	PROC_ACTIVE	-> PROC_DEACTIVATE	spa_deactivate()
 *	PROC_DEACTIVATE	-> PROC_GONE		spa_thread()
 *	PROC_GONE	-> PROC_NONE		spa_deactivate()
 */
typedef enum spa_proc_state {
	SPA_PROC_NONE,		/* spa_proc = &p0, no process created */
	SPA_PROC_CREATED,	/* spa_activate() has proc, is waiting */
	SPA_PROC_ACTIVE,	/* taskqs created, spa_proc set */
	SPA_PROC_DEACTIVATE,	/* spa_deactivate() requests process exit */
	SPA_PROC_GONE		/* spa_thread() is exiting, spa_proc = &p0 */
} spa_proc_state_t;

typedef struct spa_taskqs {
	uint_t stqs_count;
	taskq_t **stqs_taskq;
} spa_taskqs_t;

struct spa {
	/*
	 * Fields protected by spa_namespace_lock.
	 */
	char		spa_name[MAXNAMELEN];	/* pool name */
	char		*spa_comment;		/* comment */
	avl_node_t	spa_avl;		/* node in spa_namespace_avl */
	nvlist_t	*spa_config;		/* last synced config */
	nvlist_t	*spa_config_syncing;	/* currently syncing config */
	nvlist_t	*spa_config_splitting;	/* config for splitting */
	nvlist_t	*spa_load_info;		/* info and errors from load */
	uint64_t	spa_config_txg;		/* txg of last config change */
	int		spa_sync_pass;		/* iterate-to-convergence */
	pool_state_t	spa_state;		/* pool state */
	int		spa_inject_ref;		/* injection references */
	uint8_t		spa_sync_on;		/* sync threads are running */
	spa_load_state_t spa_load_state;	/* current load operation */
	uint64_t	spa_import_flags;	/* import specific flags */
	spa_taskqs_t	spa_zio_taskq[ZIO_TYPES][ZIO_TASKQ_TYPES];
	dsl_pool_t	*spa_dsl_pool;
	boolean_t	spa_is_initializing;	/* true while opening pool */
	metaslab_class_t *spa_normal_class;	/* normal data class */
	metaslab_class_t *spa_log_class;	/* intent log data class */
	uint64_t	spa_first_txg;		/* first txg after spa_open() */
	uint64_t	spa_final_txg;		/* txg of export/destroy */
	uint64_t	spa_freeze_txg;		/* freeze pool at this txg */
	uint64_t	spa_load_max_txg;	/* best initial ub_txg */
	uint64_t	spa_claim_max_txg;	/* highest claimed birth txg */
	timespec_t	spa_loaded_ts;		/* 1st successful open time */
	objset_t	*spa_meta_objset;	/* copy of dp->dp_meta_objset */
	kmutex_t	spa_evicting_os_lock;	/* Evicting objset list lock */
	list_t		spa_evicting_os_list;	/* Objsets being evicted. */
	kcondvar_t	spa_evicting_os_cv;	/* Objset Eviction Completion */
	txg_list_t	spa_vdev_txg_list;	/* per-txg dirty vdev list */
	vdev_t		*spa_root_vdev;		/* top-level vdev container */
	int		spa_min_ashift;		/* of vdevs in normal class */
	int		spa_max_ashift;		/* of vdevs in normal class */
	uint64_t	spa_config_guid;	/* config pool guid */
	uint64_t	spa_load_guid;		/* spa_load initialized guid */
	uint64_t	spa_last_synced_guid;	/* last synced guid */
	list_t		spa_config_dirty_list;	/* vdevs with dirty config */
	list_t		spa_state_dirty_list;	/* vdevs with dirty state */
	spa_aux_vdev_t	spa_spares;		/* hot spares */
	spa_aux_vdev_t	spa_l2cache;		/* L2ARC cache devices */
	nvlist_t	*spa_label_features;	/* Features for reading MOS */
	uint64_t	spa_config_object;	/* MOS object for pool config */
	uint64_t	spa_config_generation;	/* config generation number */
	uint64_t	spa_syncing_txg;	/* txg currently syncing */
	bpobj_t		spa_deferred_bpobj;	/* deferred-free bplist */
	bplist_t	spa_free_bplist[TXG_SIZE]; /* bplist of stuff to free */
	uberblock_t	spa_ubsync;		/* last synced uberblock */
	uberblock_t	spa_uberblock;		/* current uberblock */
	boolean_t	spa_extreme_rewind;	/* rewind past deferred frees */
	uint64_t	spa_last_io;		/* lbolt of last non-scan I/O */
	kmutex_t	spa_scrub_lock;		/* resilver/scrub lock */
	uint64_t	spa_scrub_inflight;	/* in-flight scrub I/Os */
	kcondvar_t	spa_scrub_io_cv;	/* scrub I/O completion */
	uint8_t		spa_scrub_active;	/* active or suspended? */
	uint8_t		spa_scrub_type;		/* type of scrub we're doing */
	uint8_t		spa_scrub_finished;	/* indicator to rotate logs */
	uint8_t		spa_scrub_started;	/* started since last boot */
	uint8_t		spa_scrub_reopen;	/* scrub doing vdev_reopen */
	uint64_t	spa_scan_pass_start;	/* start time per pass/reboot */
	uint64_t	spa_scan_pass_exam;	/* examined bytes per pass */
	kmutex_t	spa_async_lock;		/* protect async state */
	kthread_t	*spa_async_thread;	/* thread doing async task */
	int		spa_async_suspended;	/* async tasks suspended */
	kcondvar_t	spa_async_cv;		/* wait for thread_exit() */
	uint16_t	spa_async_tasks;	/* async task mask */
	char		*spa_root;		/* alternate root directory */
	uint64_t	spa_ena;		/* spa-wide ereport ENA */
	int		spa_last_open_failed;	/* error if last open failed */
	uint64_t	spa_last_ubsync_txg;	/* "best" uberblock txg */
	uint64_t	spa_last_ubsync_txg_ts;	/* timestamp from that ub */
	uint64_t	spa_load_txg;		/* ub txg that loaded */
	uint64_t	spa_load_txg_ts;	/* timestamp from that ub */
	uint64_t	spa_load_meta_errors;	/* verify metadata err count */
	uint64_t	spa_load_data_errors;	/* verify data err count */
	uint64_t	spa_verify_min_txg;	/* start txg of verify scrub */
	kmutex_t	spa_errlog_lock;	/* error log lock */
	uint64_t	spa_errlog_last;	/* last error log object */
	uint64_t	spa_errlog_scrub;	/* scrub error log object */
	kmutex_t	spa_errlist_lock;	/* error list/ereport lock */
	avl_tree_t	spa_errlist_last;	/* last error list */
	avl_tree_t	spa_errlist_scrub;	/* scrub error list */
	uint64_t	spa_deflate;		/* should we deflate? */
	uint64_t	spa_history;		/* history object */
	kmutex_t	spa_history_lock;	/* history lock */
	vdev_t		*spa_pending_vdev;	/* pending vdev additions */
	kmutex_t	spa_props_lock;		/* property lock */
	uint64_t	spa_pool_props_object;	/* object for properties */
	uint64_t	spa_bootfs;		/* default boot filesystem */
	uint64_t	spa_failmode;		/* failure mode for the pool */
	uint64_t	spa_delegation;		/* delegation on/off */
	list_t		spa_config_list;	/* previous cache file(s) */
	/* per-CPU array of root of async I/O: */
	zio_t		**spa_async_zio_root;
	zio_t		*spa_suspend_zio_root;	/* root of all suspended I/O */
	kmutex_t	spa_suspend_lock;	/* protects suspend_zio_root */
	kcondvar_t	spa_suspend_cv;		/* notification of resume */
	uint8_t		spa_suspended;		/* pool is suspended */
	uint8_t		spa_claiming;		/* pool is doing zil_claim() */
	boolean_t	spa_debug;		/* debug enabled? */
	boolean_t	spa_is_root;		/* pool is root */
	int		spa_minref;		/* num refs when first opened */
	int		spa_mode;		/* FREAD | FWRITE */
	spa_log_state_t spa_log_state;		/* log state */
	uint64_t	spa_autoexpand;		/* lun expansion on/off */
	ddt_t		*spa_ddt[ZIO_CHECKSUM_FUNCTIONS]; /* in-core DDTs */
	uint64_t	spa_ddt_stat_object;	/* DDT statistics */
	uint64_t	spa_dedup_ditto;	/* dedup ditto threshold */
	uint64_t	spa_dedup_checksum;	/* default dedup checksum */
	uint64_t	spa_dspace;		/* dspace in normal class */
	kmutex_t	spa_vdev_top_lock;	/* dueling offline/remove */
	kmutex_t	spa_proc_lock;		/* protects spa_proc* */
	kcondvar_t	spa_proc_cv;		/* spa_proc_state transitions */
	spa_proc_state_t spa_proc_state;	/* see definition */
	proc_t		*spa_proc;		/* "zpool-poolname" process */
	uint64_t	spa_did;		/* if procp != p0, did of t1 */
	boolean_t	spa_autoreplace;	/* autoreplace set in open */
	int		spa_vdev_locks;		/* locks grabbed */
	uint64_t	spa_creation_version;	/* version at pool creation */
	uint64_t	spa_prev_software_version; /* See ub_software_version */
	uint64_t	spa_feat_for_write_obj;	/* required to write to pool */
	uint64_t	spa_feat_for_read_obj;	/* required to read from pool */
	uint64_t	spa_feat_desc_obj;	/* Feature descriptions */
	uint64_t	spa_feat_enabled_txg_obj; /* Feature enabled txg */
	kmutex_t	spa_feat_stats_lock;	/* protects spa_feat_stats */
	nvlist_t	*spa_feat_stats;	/* Cache of enabled features */
	/* cache feature refcounts */
	uint64_t	spa_feat_refcount_cache[SPA_FEATURES];
	taskqid_t	spa_deadman_tqid;	/* Task id */
	uint64_t	spa_deadman_calls;	/* number of deadman calls */
	hrtime_t	spa_sync_starttime;	/* starting time of spa_sync */
	uint64_t	spa_deadman_synctime;	/* deadman expiration timer */
	uint64_t	spa_errata;		/* errata issues detected */
	spa_stats_t	spa_stats;		/* assorted spa statistics */
	taskq_t		*spa_zvol_taskq;	/* Taskq for minor managment */

	/*
	 * spa_refcount & spa_config_lock must be the last elements
	 * because refcount_t changes size based on compilation options.
	 * In order for the MDB module to function correctly, the other
	 * fields must remain in the same location.
	 */
	spa_config_lock_t spa_config_lock[SCL_LOCKS]; /* config changes */
	refcount_t	spa_refcount;		/* number of opens */
};

extern char *spa_config_path;

extern void spa_taskq_dispatch_ent(spa_t *spa, zio_type_t t, zio_taskq_type_t q,
    task_func_t *func, void *arg, uint_t flags, taskq_ent_t *ent);
extern void spa_taskq_dispatch_sync(spa_t *, zio_type_t t, zio_taskq_type_t q,
    task_func_t *func, void *arg, uint_t flags);


#ifdef	__cplusplus
}
#endif

#endif	/* _SYS_SPA_IMPL_H */
Commit	Line	Data
70e083d2 TG	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, 2015 by Delphix. All rights reserved.
	24	* Copyright 2011 Nexenta Systems, Inc. All rights reserved.
	25	* Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
	26	* Copyright (c) 2016 Actifio, Inc. All rights reserved.
	27	*/
	28
	29	#ifndef _SYS_SPA_IMPL_H
	30	#define _SYS_SPA_IMPL_H
	31
	32	#include <sys/spa.h>
	33	#include <sys/vdev.h>
	34	#include <sys/metaslab.h>
	35	#include <sys/dmu.h>
	36	#include <sys/dsl_pool.h>
	37	#include <sys/uberblock_impl.h>
	38	#include <sys/zfs_context.h>
	39	#include <sys/avl.h>
	40	#include <sys/refcount.h>
	41	#include <sys/bplist.h>
	42	#include <sys/bpobj.h>
	43	#include <sys/zfeature.h>
	44	#include <zfeature_common.h>
	45
	46	#ifdef __cplusplus
	47	extern "C" {
	48	#endif
	49
	50	typedef struct spa_error_entry {
	51	zbookmark_phys_t se_bookmark;
	52	char *se_name;
	53	avl_node_t se_avl;
	54	} spa_error_entry_t;
	55
	56	typedef struct spa_history_phys {
	57	uint64_t sh_pool_create_len; /* ending offset of zpool create */
	58	uint64_t sh_phys_max_off; /* physical EOF */
	59	uint64_t sh_bof; /* logical BOF */
	60	uint64_t sh_eof; /* logical EOF */
	61	uint64_t sh_records_lost; /* num of records overwritten */
	62	} spa_history_phys_t;
	63
	64	struct spa_aux_vdev {
65	uint64_t sav_object; /* MOS object for device list */
66	nvlist_t sav_config; / cached device config */
67	vdev_t *sav_vdevs; / devices */
68	int sav_count; /* number devices */
69	boolean_t sav_sync; /* sync the device list */
70	nvlist_t *sav_pending; / pending device additions */
71	uint_t sav_npending; /* # pending devices */
72	};
73
74	typedef struct spa_config_lock {
75	kmutex_t scl_lock;
76	kthread_t *scl_writer;
77	int scl_write_wanted;
78	kcondvar_t scl_cv;
79	refcount_t scl_count;
80	} spa_config_lock_t;
81
82	typedef struct spa_config_dirent {
83	list_node_t scd_link;
84	char *scd_path;
85	} spa_config_dirent_t;
86
87	typedef enum zio_taskq_type {
88	ZIO_TASKQ_ISSUE = 0,
89	ZIO_TASKQ_ISSUE_HIGH,
90	ZIO_TASKQ_INTERRUPT,
91	ZIO_TASKQ_INTERRUPT_HIGH,
92	ZIO_TASKQ_TYPES
93	} zio_taskq_type_t;
94
95	/*
96	* State machine for the zpool-poolname process. The states transitions
97	* are done as follows:
98	*
99	* From To Routine
100	* PROC_NONE -> PROC_CREATED spa_activate()
101	* PROC_CREATED -> PROC_ACTIVE spa_thread()
102	* PROC_ACTIVE -> PROC_DEACTIVATE spa_deactivate()
103	* PROC_DEACTIVATE -> PROC_GONE spa_thread()
104	* PROC_GONE -> PROC_NONE spa_deactivate()
105	*/
106	typedef enum spa_proc_state {
107	SPA_PROC_NONE, /* spa_proc = &p0, no process created */
108	SPA_PROC_CREATED, /* spa_activate() has proc, is waiting */
109	SPA_PROC_ACTIVE, /* taskqs created, spa_proc set */
110	SPA_PROC_DEACTIVATE, /* spa_deactivate() requests process exit */
111	SPA_PROC_GONE /* spa_thread() is exiting, spa_proc = &p0 */
112	} spa_proc_state_t;
113
114	typedef struct spa_taskqs {
115	uint_t stqs_count;
116	taskq_t **stqs_taskq;
117	} spa_taskqs_t;
118
119	struct spa {
120	/*
121	* Fields protected by spa_namespace_lock.
122	*/
123	char spa_name[MAXNAMELEN]; /* pool name */
124	char spa_comment; / comment */
125	avl_node_t spa_avl; /* node in spa_namespace_avl */
126	nvlist_t spa_config; / last synced config */
127	nvlist_t spa_config_syncing; / currently syncing config */
128	nvlist_t spa_config_splitting; / config for splitting */
129	nvlist_t spa_load_info; / info and errors from load */
130	uint64_t spa_config_txg; /* txg of last config change */
131	int spa_sync_pass; /* iterate-to-convergence */
132	pool_state_t spa_state; /* pool state */
133	int spa_inject_ref; /* injection references */
134	uint8_t spa_sync_on; /* sync threads are running */
135	spa_load_state_t spa_load_state; /* current load operation */
136	uint64_t spa_import_flags; /* import specific flags */
137	spa_taskqs_t spa_zio_taskq[ZIO_TYPES][ZIO_TASKQ_TYPES];
138	dsl_pool_t *spa_dsl_pool;
139	boolean_t spa_is_initializing; /* true while opening pool */
140	metaslab_class_t spa_normal_class; / normal data class */
141	metaslab_class_t spa_log_class; / intent log data class */
142	uint64_t spa_first_txg; /* first txg after spa_open() */
143	uint64_t spa_final_txg; /* txg of export/destroy */
144	uint64_t spa_freeze_txg; /* freeze pool at this txg */
145	uint64_t spa_load_max_txg; /* best initial ub_txg */
146	uint64_t spa_claim_max_txg; /* highest claimed birth txg */
147	timespec_t spa_loaded_ts; /* 1st successful open time */
148	objset_t spa_meta_objset; / copy of dp->dp_meta_objset */
149	kmutex_t spa_evicting_os_lock; /* Evicting objset list lock */
150	list_t spa_evicting_os_list; /* Objsets being evicted. */
151	kcondvar_t spa_evicting_os_cv; /* Objset Eviction Completion */
152	txg_list_t spa_vdev_txg_list; /* per-txg dirty vdev list */
153	vdev_t spa_root_vdev; / top-level vdev container */
154	int spa_min_ashift; /* of vdevs in normal class */
155	int spa_max_ashift; /* of vdevs in normal class */
156	uint64_t spa_config_guid; /* config pool guid */
157	uint64_t spa_load_guid; /* spa_load initialized guid */
158	uint64_t spa_last_synced_guid; /* last synced guid */
159	list_t spa_config_dirty_list; /* vdevs with dirty config */
160	list_t spa_state_dirty_list; /* vdevs with dirty state */
161	spa_aux_vdev_t spa_spares; /* hot spares */
162	spa_aux_vdev_t spa_l2cache; /* L2ARC cache devices */
163	nvlist_t spa_label_features; / Features for reading MOS */
164	uint64_t spa_config_object; /* MOS object for pool config */
165	uint64_t spa_config_generation; /* config generation number */
166	uint64_t spa_syncing_txg; /* txg currently syncing */
167	bpobj_t spa_deferred_bpobj; /* deferred-free bplist */
168	bplist_t spa_free_bplist[TXG_SIZE]; /* bplist of stuff to free */
169	uberblock_t spa_ubsync; /* last synced uberblock */
170	uberblock_t spa_uberblock; /* current uberblock */
171	boolean_t spa_extreme_rewind; /* rewind past deferred frees */
172	uint64_t spa_last_io; /* lbolt of last non-scan I/O */
173	kmutex_t spa_scrub_lock; /* resilver/scrub lock */
174	uint64_t spa_scrub_inflight; /* in-flight scrub I/Os */
175	kcondvar_t spa_scrub_io_cv; /* scrub I/O completion */
176	uint8_t spa_scrub_active; /* active or suspended? */
177	uint8_t spa_scrub_type; /* type of scrub we're doing */
178	uint8_t spa_scrub_finished; /* indicator to rotate logs */
179	uint8_t spa_scrub_started; /* started since last boot */
180	uint8_t spa_scrub_reopen; /* scrub doing vdev_reopen */
181	uint64_t spa_scan_pass_start; /* start time per pass/reboot */
182	uint64_t spa_scan_pass_exam; /* examined bytes per pass */
183	kmutex_t spa_async_lock; /* protect async state */
184	kthread_t spa_async_thread; / thread doing async task */
185	int spa_async_suspended; /* async tasks suspended */
186	kcondvar_t spa_async_cv; /* wait for thread_exit() */
187	uint16_t spa_async_tasks; /* async task mask */
188	char spa_root; / alternate root directory */
189	uint64_t spa_ena; /* spa-wide ereport ENA */
190	int spa_last_open_failed; /* error if last open failed */
191	uint64_t spa_last_ubsync_txg; /* "best" uberblock txg */
192	uint64_t spa_last_ubsync_txg_ts; /* timestamp from that ub */
193	uint64_t spa_load_txg; /* ub txg that loaded */
194	uint64_t spa_load_txg_ts; /* timestamp from that ub */
195	uint64_t spa_load_meta_errors; /* verify metadata err count */
196	uint64_t spa_load_data_errors; /* verify data err count */
197	uint64_t spa_verify_min_txg; /* start txg of verify scrub */
198	kmutex_t spa_errlog_lock; /* error log lock */
199	uint64_t spa_errlog_last; /* last error log object */
200	uint64_t spa_errlog_scrub; /* scrub error log object */
201	kmutex_t spa_errlist_lock; /* error list/ereport lock */
202	avl_tree_t spa_errlist_last; /* last error list */
203	avl_tree_t spa_errlist_scrub; /* scrub error list */
204	uint64_t spa_deflate; /* should we deflate? */
205	uint64_t spa_history; /* history object */
206	kmutex_t spa_history_lock; /* history lock */
207	vdev_t spa_pending_vdev; / pending vdev additions */
208	kmutex_t spa_props_lock; /* property lock */
209	uint64_t spa_pool_props_object; /* object for properties */
210	uint64_t spa_bootfs; /* default boot filesystem */
211	uint64_t spa_failmode; /* failure mode for the pool */
212	uint64_t spa_delegation; /* delegation on/off */
213	list_t spa_config_list; /* previous cache file(s) */
214	/* per-CPU array of root of async I/O: */
215	zio_t **spa_async_zio_root;
216	zio_t spa_suspend_zio_root; / root of all suspended I/O */
217	kmutex_t spa_suspend_lock; /* protects suspend_zio_root */
218	kcondvar_t spa_suspend_cv; /* notification of resume */
219	uint8_t spa_suspended; /* pool is suspended */
220	uint8_t spa_claiming; /* pool is doing zil_claim() */
221	boolean_t spa_debug; /* debug enabled? */
222	boolean_t spa_is_root; /* pool is root */
223	int spa_minref; /* num refs when first opened */
224	int spa_mode; /* FREAD \| FWRITE */
225	spa_log_state_t spa_log_state; /* log state */
226	uint64_t spa_autoexpand; /* lun expansion on/off */
227	ddt_t spa_ddt[ZIO_CHECKSUM_FUNCTIONS]; / in-core DDTs */
228	uint64_t spa_ddt_stat_object; /* DDT statistics */
229	uint64_t spa_dedup_ditto; /* dedup ditto threshold */
230	uint64_t spa_dedup_checksum; /* default dedup checksum */
231	uint64_t spa_dspace; /* dspace in normal class */
232	kmutex_t spa_vdev_top_lock; /* dueling offline/remove */
233	kmutex_t spa_proc_lock; /* protects spa_proc* */
234	kcondvar_t spa_proc_cv; /* spa_proc_state transitions */
235	spa_proc_state_t spa_proc_state; /* see definition */
236	proc_t spa_proc; / "zpool-poolname" process */
237	uint64_t spa_did; /* if procp != p0, did of t1 */
238	boolean_t spa_autoreplace; /* autoreplace set in open */
239	int spa_vdev_locks; /* locks grabbed */
240	uint64_t spa_creation_version; /* version at pool creation */
241	uint64_t spa_prev_software_version; /* See ub_software_version */
242	uint64_t spa_feat_for_write_obj; /* required to write to pool */
243	uint64_t spa_feat_for_read_obj; /* required to read from pool */
244	uint64_t spa_feat_desc_obj; /* Feature descriptions */
245	uint64_t spa_feat_enabled_txg_obj; /* Feature enabled txg */
246	kmutex_t spa_feat_stats_lock; /* protects spa_feat_stats */
247	nvlist_t spa_feat_stats; / Cache of enabled features */
248	/* cache feature refcounts */
249	uint64_t spa_feat_refcount_cache[SPA_FEATURES];
250	taskqid_t spa_deadman_tqid; /* Task id */
251	uint64_t spa_deadman_calls; /* number of deadman calls */
252	hrtime_t spa_sync_starttime; /* starting time of spa_sync */
253	uint64_t spa_deadman_synctime; /* deadman expiration timer */
254	uint64_t spa_errata; /* errata issues detected */
255	spa_stats_t spa_stats; /* assorted spa statistics */
256	taskq_t spa_zvol_taskq; / Taskq for minor managment */
257
258	/*
259	* spa_refcount & spa_config_lock must be the last elements
260	* because refcount_t changes size based on compilation options.
261	* In order for the MDB module to function correctly, the other
262	* fields must remain in the same location.
263	*/
264	spa_config_lock_t spa_config_lock[SCL_LOCKS]; /* config changes */
265	refcount_t spa_refcount; /* number of opens */
266	};
267
268	extern char *spa_config_path;
269
270	extern void spa_taskq_dispatch_ent(spa_t *spa, zio_type_t t, zio_taskq_type_t q,
271	task_func_t func, void arg, uint_t flags, taskq_ent_t *ent);
272	extern void spa_taskq_dispatch_sync(spa_t *, zio_type_t t, zio_taskq_type_t q,
273	task_func_t func, void arg, uint_t flags);
274
275
276	#ifdef __cplusplus
277	}
278	#endif
279
280	#endif /* _SYS_SPA_IMPL_H */