spa.h revision 6809eb4e2a4a94bcc76229c7b5108b96134537b6
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 2009 Sun Microsystems, Inc.  All rights reserved.
23 * Use is subject to license terms.
24 */
25
26#ifndef _SYS_SPA_H
27#define	_SYS_SPA_H
28
29#include <sys/avl.h>
30#include <sys/zfs_context.h>
31#include <sys/nvpair.h>
32#include <sys/sysmacros.h>
33#include <sys/types.h>
34#include <sys/fs/zfs.h>
35
36#ifdef	__cplusplus
37extern "C" {
38#endif
39
40/*
41 * Forward references that lots of things need.
42 */
43typedef struct spa spa_t;
44typedef struct vdev vdev_t;
45typedef struct metaslab metaslab_t;
46typedef struct zilog zilog_t;
47typedef struct spa_aux_vdev spa_aux_vdev_t;
48struct dsl_pool;
49
50/*
51 * General-purpose 32-bit and 64-bit bitfield encodings.
52 */
53#define	BF32_DECODE(x, low, len)	P2PHASE((x) >> (low), 1U << (len))
54#define	BF64_DECODE(x, low, len)	P2PHASE((x) >> (low), 1ULL << (len))
55#define	BF32_ENCODE(x, low, len)	(P2PHASE((x), 1U << (len)) << (low))
56#define	BF64_ENCODE(x, low, len)	(P2PHASE((x), 1ULL << (len)) << (low))
57
58#define	BF32_GET(x, low, len)		BF32_DECODE(x, low, len)
59#define	BF64_GET(x, low, len)		BF64_DECODE(x, low, len)
60
61#define	BF32_SET(x, low, len, val)	\
62	((x) ^= BF32_ENCODE((x >> low) ^ (val), low, len))
63#define	BF64_SET(x, low, len, val)	\
64	((x) ^= BF64_ENCODE((x >> low) ^ (val), low, len))
65
66#define	BF32_GET_SB(x, low, len, shift, bias)	\
67	((BF32_GET(x, low, len) + (bias)) << (shift))
68#define	BF64_GET_SB(x, low, len, shift, bias)	\
69	((BF64_GET(x, low, len) + (bias)) << (shift))
70
71#define	BF32_SET_SB(x, low, len, shift, bias, val)	\
72	BF32_SET(x, low, len, ((val) >> (shift)) - (bias))
73#define	BF64_SET_SB(x, low, len, shift, bias, val)	\
74	BF64_SET(x, low, len, ((val) >> (shift)) - (bias))
75
76/*
77 * We currently support nine block sizes, from 512 bytes to 128K.
78 * We could go higher, but the benefits are near-zero and the cost
79 * of COWing a giant block to modify one byte would become excessive.
80 */
81#define	SPA_MINBLOCKSHIFT	9
82#define	SPA_MAXBLOCKSHIFT	17
83#define	SPA_MINBLOCKSIZE	(1ULL << SPA_MINBLOCKSHIFT)
84#define	SPA_MAXBLOCKSIZE	(1ULL << SPA_MAXBLOCKSHIFT)
85
86#define	SPA_BLOCKSIZES		(SPA_MAXBLOCKSHIFT - SPA_MINBLOCKSHIFT + 1)
87
88/*
89 * Size of block to hold the configuration data (a packed nvlist)
90 */
91#define	SPA_CONFIG_BLOCKSIZE	(1 << 14)
92
93/*
94 * The DVA size encodings for LSIZE and PSIZE support blocks up to 32MB.
95 * The ASIZE encoding should be at least 64 times larger (6 more bits)
96 * to support up to 4-way RAID-Z mirror mode with worst-case gang block
97 * overhead, three DVAs per bp, plus one more bit in case we do anything
98 * else that expands the ASIZE.
99 */
100#define	SPA_LSIZEBITS		16	/* LSIZE up to 32M (2^16 * 512)	*/
101#define	SPA_PSIZEBITS		16	/* PSIZE up to 32M (2^16 * 512)	*/
102#define	SPA_ASIZEBITS		24	/* ASIZE up to 64 times larger	*/
103
104/*
105 * All SPA data is represented by 128-bit data virtual addresses (DVAs).
106 * The members of the dva_t should be considered opaque outside the SPA.
107 */
108typedef struct dva {
109	uint64_t	dva_word[2];
110} dva_t;
111
112/*
113 * Each block has a 256-bit checksum -- strong enough for cryptographic hashes.
114 */
115typedef struct zio_cksum {
116	uint64_t	zc_word[4];
117} zio_cksum_t;
118
119/*
120 * Each block is described by its DVAs, time of birth, checksum, etc.
121 * The word-by-word, bit-by-bit layout of the blkptr is as follows:
122 *
123 *	64	56	48	40	32	24	16	8	0
124 *	+-------+-------+-------+-------+-------+-------+-------+-------+
125 * 0	|		vdev1		| GRID  |	  ASIZE		|
126 *	+-------+-------+-------+-------+-------+-------+-------+-------+
127 * 1	|G|			 offset1				|
128 *	+-------+-------+-------+-------+-------+-------+-------+-------+
129 * 2	|		vdev2		| GRID  |	  ASIZE		|
130 *	+-------+-------+-------+-------+-------+-------+-------+-------+
131 * 3	|G|			 offset2				|
132 *	+-------+-------+-------+-------+-------+-------+-------+-------+
133 * 4	|		vdev3		| GRID  |	  ASIZE		|
134 *	+-------+-------+-------+-------+-------+-------+-------+-------+
135 * 5	|G|			 offset3				|
136 *	+-------+-------+-------+-------+-------+-------+-------+-------+
137 * 6	|E| lvl | type	| cksum | comp	|     PSIZE	|     LSIZE	|
138 *	+-------+-------+-------+-------+-------+-------+-------+-------+
139 * 7	|			padding					|
140 *	+-------+-------+-------+-------+-------+-------+-------+-------+
141 * 8	|			padding					|
142 *	+-------+-------+-------+-------+-------+-------+-------+-------+
143 * 9	|			padding					|
144 *	+-------+-------+-------+-------+-------+-------+-------+-------+
145 * a	|			birth txg				|
146 *	+-------+-------+-------+-------+-------+-------+-------+-------+
147 * b	|			fill count				|
148 *	+-------+-------+-------+-------+-------+-------+-------+-------+
149 * c	|			checksum[0]				|
150 *	+-------+-------+-------+-------+-------+-------+-------+-------+
151 * d	|			checksum[1]				|
152 *	+-------+-------+-------+-------+-------+-------+-------+-------+
153 * e	|			checksum[2]				|
154 *	+-------+-------+-------+-------+-------+-------+-------+-------+
155 * f	|			checksum[3]				|
156 *	+-------+-------+-------+-------+-------+-------+-------+-------+
157 *
158 * Legend:
159 *
160 * vdev		virtual device ID
161 * offset	offset into virtual device
162 * LSIZE	logical size
163 * PSIZE	physical size (after compression)
164 * ASIZE	allocated size (including RAID-Z parity and gang block headers)
165 * GRID		RAID-Z layout information (reserved for future use)
166 * cksum	checksum function
167 * comp		compression function
168 * G		gang block indicator
169 * E		endianness
170 * type		DMU object type
171 * lvl		level of indirection
172 * birth txg	transaction group in which the block was born
173 * fill count	number of non-zero blocks under this bp
174 * checksum[4]	256-bit checksum of the data this bp describes
175 */
176typedef struct blkptr {
177	dva_t		blk_dva[3];	/* 128-bit Data Virtual Address	*/
178	uint64_t	blk_prop;	/* size, compression, type, etc	*/
179	uint64_t	blk_pad[3];	/* Extra space for the future	*/
180	uint64_t	blk_birth;	/* transaction group at birth	*/
181	uint64_t	blk_fill;	/* fill count			*/
182	zio_cksum_t	blk_cksum;	/* 256-bit checksum		*/
183} blkptr_t;
184
185#define	SPA_BLKPTRSHIFT	7		/* blkptr_t is 128 bytes	*/
186#define	SPA_DVAS_PER_BP	3		/* Number of DVAs in a bp	*/
187
188/*
189 * Macros to get and set fields in a bp or DVA.
190 */
191#define	DVA_GET_ASIZE(dva)	\
192	BF64_GET_SB((dva)->dva_word[0], 0, 24, SPA_MINBLOCKSHIFT, 0)
193#define	DVA_SET_ASIZE(dva, x)	\
194	BF64_SET_SB((dva)->dva_word[0], 0, 24, SPA_MINBLOCKSHIFT, 0, x)
195
196#define	DVA_GET_GRID(dva)	BF64_GET((dva)->dva_word[0], 24, 8)
197#define	DVA_SET_GRID(dva, x)	BF64_SET((dva)->dva_word[0], 24, 8, x)
198
199#define	DVA_GET_VDEV(dva)	BF64_GET((dva)->dva_word[0], 32, 32)
200#define	DVA_SET_VDEV(dva, x)	BF64_SET((dva)->dva_word[0], 32, 32, x)
201
202#define	DVA_GET_OFFSET(dva)	\
203	BF64_GET_SB((dva)->dva_word[1], 0, 63, SPA_MINBLOCKSHIFT, 0)
204#define	DVA_SET_OFFSET(dva, x)	\
205	BF64_SET_SB((dva)->dva_word[1], 0, 63, SPA_MINBLOCKSHIFT, 0, x)
206
207#define	DVA_GET_GANG(dva)	BF64_GET((dva)->dva_word[1], 63, 1)
208#define	DVA_SET_GANG(dva, x)	BF64_SET((dva)->dva_word[1], 63, 1, x)
209
210#define	BP_GET_LSIZE(bp)	\
211	(BP_IS_HOLE(bp) ? 0 : \
212	BF64_GET_SB((bp)->blk_prop, 0, 16, SPA_MINBLOCKSHIFT, 1))
213#define	BP_SET_LSIZE(bp, x)	\
214	BF64_SET_SB((bp)->blk_prop, 0, 16, SPA_MINBLOCKSHIFT, 1, x)
215
216#define	BP_GET_PSIZE(bp)	\
217	BF64_GET_SB((bp)->blk_prop, 16, 16, SPA_MINBLOCKSHIFT, 1)
218#define	BP_SET_PSIZE(bp, x)	\
219	BF64_SET_SB((bp)->blk_prop, 16, 16, SPA_MINBLOCKSHIFT, 1, x)
220
221#define	BP_GET_COMPRESS(bp)	BF64_GET((bp)->blk_prop, 32, 8)
222#define	BP_SET_COMPRESS(bp, x)	BF64_SET((bp)->blk_prop, 32, 8, x)
223
224#define	BP_GET_CHECKSUM(bp)	BF64_GET((bp)->blk_prop, 40, 8)
225#define	BP_SET_CHECKSUM(bp, x)	BF64_SET((bp)->blk_prop, 40, 8, x)
226
227#define	BP_GET_TYPE(bp)		BF64_GET((bp)->blk_prop, 48, 8)
228#define	BP_SET_TYPE(bp, x)	BF64_SET((bp)->blk_prop, 48, 8, x)
229
230#define	BP_GET_LEVEL(bp)	BF64_GET((bp)->blk_prop, 56, 5)
231#define	BP_SET_LEVEL(bp, x)	BF64_SET((bp)->blk_prop, 56, 5, x)
232
233#define	BP_GET_BYTEORDER(bp)	(0 - BF64_GET((bp)->blk_prop, 63, 1))
234#define	BP_SET_BYTEORDER(bp, x)	BF64_SET((bp)->blk_prop, 63, 1, x)
235
236#define	BP_GET_ASIZE(bp)	\
237	(DVA_GET_ASIZE(&(bp)->blk_dva[0]) + DVA_GET_ASIZE(&(bp)->blk_dva[1]) + \
238		DVA_GET_ASIZE(&(bp)->blk_dva[2]))
239
240#define	BP_GET_UCSIZE(bp) \
241	((BP_GET_LEVEL(bp) > 0 || dmu_ot[BP_GET_TYPE(bp)].ot_metadata) ? \
242	BP_GET_PSIZE(bp) : BP_GET_LSIZE(bp));
243
244#define	BP_GET_NDVAS(bp)	\
245	(!!DVA_GET_ASIZE(&(bp)->blk_dva[0]) + \
246	!!DVA_GET_ASIZE(&(bp)->blk_dva[1]) + \
247	!!DVA_GET_ASIZE(&(bp)->blk_dva[2]))
248
249#define	BP_COUNT_GANG(bp)	\
250	(DVA_GET_GANG(&(bp)->blk_dva[0]) + \
251	DVA_GET_GANG(&(bp)->blk_dva[1]) + \
252	DVA_GET_GANG(&(bp)->blk_dva[2]))
253
254#define	DVA_EQUAL(dva1, dva2)	\
255	((dva1)->dva_word[1] == (dva2)->dva_word[1] && \
256	(dva1)->dva_word[0] == (dva2)->dva_word[0])
257
258#define	ZIO_CHECKSUM_EQUAL(zc1, zc2) \
259	(0 == (((zc1).zc_word[0] - (zc2).zc_word[0]) | \
260	((zc1).zc_word[1] - (zc2).zc_word[1]) | \
261	((zc1).zc_word[2] - (zc2).zc_word[2]) | \
262	((zc1).zc_word[3] - (zc2).zc_word[3])))
263
264#define	DVA_IS_VALID(dva)	(DVA_GET_ASIZE(dva) != 0)
265
266#define	ZIO_SET_CHECKSUM(zcp, w0, w1, w2, w3)	\
267{						\
268	(zcp)->zc_word[0] = w0;			\
269	(zcp)->zc_word[1] = w1;			\
270	(zcp)->zc_word[2] = w2;			\
271	(zcp)->zc_word[3] = w3;			\
272}
273
274#define	BP_IDENTITY(bp)		(&(bp)->blk_dva[0])
275#define	BP_IS_GANG(bp)		DVA_GET_GANG(BP_IDENTITY(bp))
276#define	BP_IS_HOLE(bp)		((bp)->blk_birth == 0)
277#define	BP_IS_OLDER(bp, txg)	(!BP_IS_HOLE(bp) && (bp)->blk_birth < (txg))
278
279#define	BP_ZERO(bp)				\
280{						\
281	(bp)->blk_dva[0].dva_word[0] = 0;	\
282	(bp)->blk_dva[0].dva_word[1] = 0;	\
283	(bp)->blk_dva[1].dva_word[0] = 0;	\
284	(bp)->blk_dva[1].dva_word[1] = 0;	\
285	(bp)->blk_dva[2].dva_word[0] = 0;	\
286	(bp)->blk_dva[2].dva_word[1] = 0;	\
287	(bp)->blk_prop = 0;			\
288	(bp)->blk_pad[0] = 0;			\
289	(bp)->blk_pad[1] = 0;			\
290	(bp)->blk_pad[2] = 0;			\
291	(bp)->blk_birth = 0;			\
292	(bp)->blk_fill = 0;			\
293	ZIO_SET_CHECKSUM(&(bp)->blk_cksum, 0, 0, 0, 0);	\
294}
295
296#define	BLK_FILL_ALREADY_FREED	(-1ULL)
297
298/*
299 * Note: the byteorder is either 0 or -1, both of which are palindromes.
300 * This simplifies the endianness handling a bit.
301 */
302#ifdef _BIG_ENDIAN
303#define	ZFS_HOST_BYTEORDER	(0ULL)
304#else
305#define	ZFS_HOST_BYTEORDER	(-1ULL)
306#endif
307
308#define	BP_SHOULD_BYTESWAP(bp)	(BP_GET_BYTEORDER(bp) != ZFS_HOST_BYTEORDER)
309
310#define	BP_SPRINTF_LEN	320
311
312#include <sys/dmu.h>
313
314#define	BP_GET_BUFC_TYPE(bp)						\
315	(((BP_GET_LEVEL(bp) > 0) || (dmu_ot[BP_GET_TYPE(bp)].ot_metadata)) ? \
316	ARC_BUFC_METADATA : ARC_BUFC_DATA);
317/*
318 * Routines found in spa.c
319 */
320
321/* state manipulation functions */
322extern int spa_open(const char *pool, spa_t **, void *tag);
323extern int spa_get_stats(const char *pool, nvlist_t **config,
324    char *altroot, size_t buflen);
325extern int spa_create(const char *pool, nvlist_t *config, nvlist_t *props,
326    const char *history_str, nvlist_t *zplprops);
327extern int spa_check_rootconf(char *devpath, char *devid,
328    nvlist_t **bestconf, uint64_t *besttxg);
329extern boolean_t spa_rootdev_validate(nvlist_t *nv);
330extern int spa_import_rootpool(char *devpath, char *devid);
331extern int spa_import(const char *pool, nvlist_t *config, nvlist_t *props);
332extern int spa_import_verbatim(const char *, nvlist_t *, nvlist_t *);
333extern nvlist_t *spa_tryimport(nvlist_t *tryconfig);
334extern int spa_destroy(char *pool);
335extern int spa_export(char *pool, nvlist_t **oldconfig, boolean_t force,
336    boolean_t hardforce);
337extern int spa_reset(char *pool);
338extern void spa_async_request(spa_t *spa, int flag);
339extern void spa_async_unrequest(spa_t *spa, int flag);
340extern void spa_async_suspend(spa_t *spa);
341extern void spa_async_resume(spa_t *spa);
342extern spa_t *spa_inject_addref(char *pool);
343extern void spa_inject_delref(spa_t *spa);
344
345#define	SPA_ASYNC_CONFIG_UPDATE	0x01
346#define	SPA_ASYNC_REMOVE	0x02
347#define	SPA_ASYNC_PROBE		0x04
348#define	SPA_ASYNC_RESILVER_DONE	0x08
349#define	SPA_ASYNC_RESILVER	0x10
350
351/* device manipulation */
352extern int spa_vdev_add(spa_t *spa, nvlist_t *nvroot);
353extern int spa_vdev_attach(spa_t *spa, uint64_t guid, nvlist_t *nvroot,
354    int replacing);
355extern int spa_vdev_detach(spa_t *spa, uint64_t guid, uint64_t pguid,
356    int replace_done);
357extern int spa_vdev_remove(spa_t *spa, uint64_t guid, boolean_t unspare);
358extern int spa_vdev_setpath(spa_t *spa, uint64_t guid, const char *newpath);
359extern int spa_vdev_setfru(spa_t *spa, uint64_t guid, const char *newfru);
360
361/* spare state (which is global across all pools) */
362extern void spa_spare_add(vdev_t *vd);
363extern void spa_spare_remove(vdev_t *vd);
364extern boolean_t spa_spare_exists(uint64_t guid, uint64_t *pool, int *refcnt);
365extern void spa_spare_activate(vdev_t *vd);
366
367/* L2ARC state (which is global across all pools) */
368extern void spa_l2cache_add(vdev_t *vd);
369extern void spa_l2cache_remove(vdev_t *vd);
370extern boolean_t spa_l2cache_exists(uint64_t guid, uint64_t *pool);
371extern void spa_l2cache_activate(vdev_t *vd);
372extern void spa_l2cache_drop(spa_t *spa);
373extern void spa_l2cache_space_update(vdev_t *vd, int64_t space, int64_t alloc);
374
375/* scrubbing */
376extern int spa_scrub(spa_t *spa, pool_scrub_type_t type);
377
378/* spa syncing */
379extern void spa_sync(spa_t *spa, uint64_t txg); /* only for DMU use */
380extern void spa_sync_allpools(void);
381
382/* spa namespace global mutex */
383extern kmutex_t spa_namespace_lock;
384
385/*
386 * SPA configuration functions in spa_config.c
387 */
388
389#define	SPA_CONFIG_UPDATE_POOL	0
390#define	SPA_CONFIG_UPDATE_VDEVS	1
391
392extern void spa_config_sync(spa_t *, boolean_t, boolean_t);
393extern void spa_config_load(void);
394extern nvlist_t *spa_all_configs(uint64_t *);
395extern void spa_config_set(spa_t *spa, nvlist_t *config);
396extern nvlist_t *spa_config_generate(spa_t *spa, vdev_t *vd, uint64_t txg,
397    int getstats);
398extern void spa_config_update(spa_t *spa, int what);
399extern void spa_config_update_common(spa_t *spa, int what, boolean_t isroot);
400
401/*
402 * Miscellaneous SPA routines in spa_misc.c
403 */
404
405/* Namespace manipulation */
406extern spa_t *spa_lookup(const char *name);
407extern spa_t *spa_add(const char *name, const char *altroot);
408extern void spa_remove(spa_t *spa);
409extern spa_t *spa_next(spa_t *prev);
410
411/* Refcount functions */
412extern void spa_open_ref(spa_t *spa, void *tag);
413extern void spa_close(spa_t *spa, void *tag);
414extern boolean_t spa_refcount_zero(spa_t *spa);
415
416#define	SCL_CONFIG	0x01
417#define	SCL_STATE	0x02
418#define	SCL_L2ARC	0x04		/* hack until L2ARC 2.0 */
419#define	SCL_ALLOC	0x08
420#define	SCL_ZIO		0x10
421#define	SCL_FREE	0x20
422#define	SCL_VDEV	0x40
423#define	SCL_LOCKS	7
424#define	SCL_ALL		((1 << SCL_LOCKS) - 1)
425#define	SCL_STATE_ALL	(SCL_STATE | SCL_L2ARC | SCL_ZIO)
426
427/* Pool configuration locks */
428extern int spa_config_tryenter(spa_t *spa, int locks, void *tag, krw_t rw);
429extern void spa_config_enter(spa_t *spa, int locks, void *tag, krw_t rw);
430extern void spa_config_exit(spa_t *spa, int locks, void *tag);
431extern int spa_config_held(spa_t *spa, int locks, krw_t rw);
432
433/* Pool vdev add/remove lock */
434extern uint64_t spa_vdev_enter(spa_t *spa);
435extern int spa_vdev_exit(spa_t *spa, vdev_t *vd, uint64_t txg, int error);
436
437/* Pool vdev state change lock */
438extern void spa_vdev_state_enter(spa_t *spa);
439extern int spa_vdev_state_exit(spa_t *spa, vdev_t *vd, int error);
440
441/* Accessor functions */
442extern boolean_t spa_shutting_down(spa_t *spa);
443extern struct dsl_pool *spa_get_dsl(spa_t *spa);
444extern blkptr_t *spa_get_rootblkptr(spa_t *spa);
445extern void spa_set_rootblkptr(spa_t *spa, const blkptr_t *bp);
446extern void spa_altroot(spa_t *, char *, size_t);
447extern int spa_sync_pass(spa_t *spa);
448extern char *spa_name(spa_t *spa);
449extern uint64_t spa_guid(spa_t *spa);
450extern uint64_t spa_last_synced_txg(spa_t *spa);
451extern uint64_t spa_first_txg(spa_t *spa);
452extern uint64_t spa_version(spa_t *spa);
453extern pool_state_t spa_state(spa_t *spa);
454extern uint64_t spa_freeze_txg(spa_t *spa);
455extern uint64_t spa_get_alloc(spa_t *spa);
456extern uint64_t spa_get_space(spa_t *spa);
457extern uint64_t spa_get_dspace(spa_t *spa);
458extern uint64_t spa_get_asize(spa_t *spa, uint64_t lsize);
459extern uint64_t spa_version(spa_t *spa);
460extern int spa_max_replication(spa_t *spa);
461extern int spa_busy(void);
462extern uint8_t spa_get_failmode(spa_t *spa);
463extern boolean_t spa_suspended(spa_t *spa);
464
465/* Miscellaneous support routines */
466extern int spa_rename(const char *oldname, const char *newname);
467extern boolean_t spa_guid_exists(uint64_t pool_guid, uint64_t device_guid);
468extern char *spa_strdup(const char *);
469extern void spa_strfree(char *);
470extern uint64_t spa_get_random(uint64_t range);
471extern void sprintf_blkptr(char *buf, int len, const blkptr_t *bp);
472extern void spa_freeze(spa_t *spa);
473extern void spa_upgrade(spa_t *spa, uint64_t version);
474extern void spa_evict_all(void);
475extern vdev_t *spa_lookup_by_guid(spa_t *spa, uint64_t guid,
476    boolean_t l2cache);
477extern boolean_t spa_has_spare(spa_t *, uint64_t guid);
478extern uint64_t bp_get_dasize(spa_t *spa, const blkptr_t *bp);
479extern boolean_t spa_has_slogs(spa_t *spa);
480extern boolean_t spa_is_root(spa_t *spa);
481extern boolean_t spa_writeable(spa_t *spa);
482extern int spa_mode(spa_t *spa);
483
484/* history logging */
485typedef enum history_log_type {
486	LOG_CMD_POOL_CREATE,
487	LOG_CMD_NORMAL,
488	LOG_INTERNAL
489} history_log_type_t;
490
491typedef struct history_arg {
492	const char *ha_history_str;
493	history_log_type_t ha_log_type;
494	history_internal_events_t ha_event;
495	char ha_zone[MAXPATHLEN];
496} history_arg_t;
497
498extern char *spa_his_ievent_table[];
499
500extern void spa_history_create_obj(spa_t *spa, dmu_tx_t *tx);
501extern int spa_history_get(spa_t *spa, uint64_t *offset, uint64_t *len_read,
502    char *his_buf);
503extern int spa_history_log(spa_t *spa, const char *his_buf,
504    history_log_type_t what);
505void spa_history_internal_log(history_internal_events_t event, spa_t *spa,
506    dmu_tx_t *tx, cred_t *cr, const char *fmt, ...);
507
508/* error handling */
509struct zbookmark;
510struct zio;
511extern void spa_log_error(spa_t *spa, struct zio *zio);
512extern void zfs_ereport_post(const char *class, spa_t *spa, vdev_t *vd,
513    struct zio *zio, uint64_t stateoroffset, uint64_t length);
514extern void zfs_post_remove(spa_t *spa, vdev_t *vd);
515extern void zfs_post_autoreplace(spa_t *spa, vdev_t *vd);
516extern uint64_t spa_get_errlog_size(spa_t *spa);
517extern int spa_get_errlog(spa_t *spa, void *uaddr, size_t *count);
518extern void spa_errlog_rotate(spa_t *spa);
519extern void spa_errlog_drain(spa_t *spa);
520extern void spa_errlog_sync(spa_t *spa, uint64_t txg);
521extern void spa_get_errlists(spa_t *spa, avl_tree_t *last, avl_tree_t *scrub);
522
523/* vdev cache */
524extern void vdev_cache_stat_init(void);
525extern void vdev_cache_stat_fini(void);
526
527/* Initialization and termination */
528extern void spa_init(int flags);
529extern void spa_fini(void);
530extern void spa_boot_init();
531
532/* properties */
533extern int spa_prop_set(spa_t *spa, nvlist_t *nvp);
534extern int spa_prop_get(spa_t *spa, nvlist_t **nvp);
535extern void spa_prop_clear_bootfs(spa_t *spa, uint64_t obj, dmu_tx_t *tx);
536extern void spa_configfile_set(spa_t *, nvlist_t *, boolean_t);
537
538/* asynchronous event notification */
539extern void spa_event_notify(spa_t *spa, vdev_t *vdev, const char *name);
540
541#ifdef ZFS_DEBUG
542#define	dprintf_bp(bp, fmt, ...) do {				\
543	if (zfs_flags & ZFS_DEBUG_DPRINTF) { 			\
544	char *__blkbuf = kmem_alloc(BP_SPRINTF_LEN, KM_SLEEP);	\
545	sprintf_blkptr(__blkbuf, BP_SPRINTF_LEN, (bp));		\
546	dprintf(fmt " %s\n", __VA_ARGS__, __blkbuf);		\
547	kmem_free(__blkbuf, BP_SPRINTF_LEN);			\
548	} \
549_NOTE(CONSTCOND) } while (0)
550#else
551#define	dprintf_bp(bp, fmt, ...)
552#endif
553
554extern int spa_mode_global;			/* mode, e.g. FREAD | FWRITE */
555
556#ifdef	__cplusplus
557}
558#endif
559
560#endif	/* _SYS_SPA_H */
561