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      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 2007 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 #pragma ident	"@(#)spa.h	1.29	07/11/09 SMI"
     30 
     31 #include <sys/avl.h>
     32 #include <sys/zfs_context.h>
     33 #include <sys/nvpair.h>
     34 #include <sys/sysmacros.h>
     35 #include <sys/types.h>
     36 #include <sys/fs/zfs.h>
     37 
     38 #ifdef	__cplusplus
     39 extern "C" {
     40 #endif
     41 
     42 /*
     43  * Forward references that lots of things need.
     44  */
     45 typedef struct spa spa_t;
     46 typedef struct vdev vdev_t;
     47 typedef struct metaslab metaslab_t;
     48 typedef struct zilog zilog_t;
     49 typedef struct traverse_handle traverse_handle_t;
     50 typedef struct spa_aux_vdev spa_aux_vdev_t;
     51 struct dsl_pool;
     52 
     53 /*
     54  * General-purpose 32-bit and 64-bit bitfield encodings.
     55  */
     56 #define	BF32_DECODE(x, low, len)	P2PHASE((x) >> (low), 1U << (len))
     57 #define	BF64_DECODE(x, low, len)	P2PHASE((x) >> (low), 1ULL << (len))
     58 #define	BF32_ENCODE(x, low, len)	(P2PHASE((x), 1U << (len)) << (low))
     59 #define	BF64_ENCODE(x, low, len)	(P2PHASE((x), 1ULL << (len)) << (low))
     60 
     61 #define	BF32_GET(x, low, len)		BF32_DECODE(x, low, len)
     62 #define	BF64_GET(x, low, len)		BF64_DECODE(x, low, len)
     63 
     64 #define	BF32_SET(x, low, len, val)	\
     65 	((x) ^= BF32_ENCODE((x >> low) ^ (val), low, len))
     66 #define	BF64_SET(x, low, len, val)	\
     67 	((x) ^= BF64_ENCODE((x >> low) ^ (val), low, len))
     68 
     69 #define	BF32_GET_SB(x, low, len, shift, bias)	\
     70 	((BF32_GET(x, low, len) + (bias)) << (shift))
     71 #define	BF64_GET_SB(x, low, len, shift, bias)	\
     72 	((BF64_GET(x, low, len) + (bias)) << (shift))
     73 
     74 #define	BF32_SET_SB(x, low, len, shift, bias, val)	\
     75 	BF32_SET(x, low, len, ((val) >> (shift)) - (bias))
     76 #define	BF64_SET_SB(x, low, len, shift, bias, val)	\
     77 	BF64_SET(x, low, len, ((val) >> (shift)) - (bias))
     78 
     79 /*
     80  * We currently support nine block sizes, from 512 bytes to 128K.
     81  * We could go higher, but the benefits are near-zero and the cost
     82  * of COWing a giant block to modify one byte would become excessive.
     83  */
     84 #define	SPA_MINBLOCKSHIFT	9
     85 #define	SPA_MAXBLOCKSHIFT	17
     86 #define	SPA_MINBLOCKSIZE	(1ULL << SPA_MINBLOCKSHIFT)
     87 #define	SPA_MAXBLOCKSIZE	(1ULL << SPA_MAXBLOCKSHIFT)
     88 
     89 #define	SPA_BLOCKSIZES		(SPA_MAXBLOCKSHIFT - SPA_MINBLOCKSHIFT + 1)
     90 
     91 /*
     92  * The DVA size encodings for LSIZE and PSIZE support blocks up to 32MB.
     93  * The ASIZE encoding should be at least 64 times larger (6 more bits)
     94  * to support up to 4-way RAID-Z mirror mode with worst-case gang block
     95  * overhead, three DVAs per bp, plus one more bit in case we do anything
     96  * else that expands the ASIZE.
     97  */
     98 #define	SPA_LSIZEBITS		16	/* LSIZE up to 32M (2^16 * 512)	*/
     99 #define	SPA_PSIZEBITS		16	/* PSIZE up to 32M (2^16 * 512)	*/
    100 #define	SPA_ASIZEBITS		24	/* ASIZE up to 64 times larger	*/
    101 
    102 /*
    103  * All SPA data is represented by 128-bit data virtual addresses (DVAs).
    104  * The members of the dva_t should be considered opaque outside the SPA.
    105  */
    106 typedef struct dva {
    107 	uint64_t	dva_word[2];
    108 } dva_t;
    109 
    110 /*
    111  * Each block has a 256-bit checksum -- strong enough for cryptographic hashes.
    112  */
    113 typedef struct zio_cksum {
    114 	uint64_t	zc_word[4];
    115 } zio_cksum_t;
    116 
    117 /*
    118  * Each block is described by its DVAs, time of birth, checksum, etc.
    119  * The word-by-word, bit-by-bit layout of the blkptr is as follows:
    120  *
    121  *	64	56	48	40	32	24	16	8	0
    122  *	+-------+-------+-------+-------+-------+-------+-------+-------+
    123  * 0	|		vdev1		| GRID  |	  ASIZE		|
    124  *	+-------+-------+-------+-------+-------+-------+-------+-------+
    125  * 1	|G|			 offset1				|
    126  *	+-------+-------+-------+-------+-------+-------+-------+-------+
    127  * 2	|		vdev2		| GRID  |	  ASIZE		|
    128  *	+-------+-------+-------+-------+-------+-------+-------+-------+
    129  * 3	|G|			 offset2				|
    130  *	+-------+-------+-------+-------+-------+-------+-------+-------+
    131  * 4	|		vdev3		| GRID  |	  ASIZE		|
    132  *	+-------+-------+-------+-------+-------+-------+-------+-------+
    133  * 5	|G|			 offset3				|
    134  *	+-------+-------+-------+-------+-------+-------+-------+-------+
    135  * 6	|E| lvl | type	| cksum | comp	|     PSIZE	|     LSIZE	|
    136  *	+-------+-------+-------+-------+-------+-------+-------+-------+
    137  * 7	|			padding					|
    138  *	+-------+-------+-------+-------+-------+-------+-------+-------+
    139  * 8	|			padding					|
    140  *	+-------+-------+-------+-------+-------+-------+-------+-------+
    141  * 9	|			padding					|
    142  *	+-------+-------+-------+-------+-------+-------+-------+-------+
    143  * a	|			birth txg				|
    144  *	+-------+-------+-------+-------+-------+-------+-------+-------+
    145  * b	|			fill count				|
    146  *	+-------+-------+-------+-------+-------+-------+-------+-------+
    147  * c	|			checksum[0]				|
    148  *	+-------+-------+-------+-------+-------+-------+-------+-------+
    149  * d	|			checksum[1]				|
    150  *	+-------+-------+-------+-------+-------+-------+-------+-------+
    151  * e	|			checksum[2]				|
    152  *	+-------+-------+-------+-------+-------+-------+-------+-------+
    153  * f	|			checksum[3]				|
    154  *	+-------+-------+-------+-------+-------+-------+-------+-------+
    155  *
    156  * Legend:
    157  *
    158  * vdev		virtual device ID
    159  * offset	offset into virtual device
    160  * LSIZE	logical size
    161  * PSIZE	physical size (after compression)
    162  * ASIZE	allocated size (including RAID-Z parity and gang block headers)
    163  * GRID		RAID-Z layout information (reserved for future use)
    164  * cksum	checksum function
    165  * comp		compression function
    166  * G		gang block indicator
    167  * E		endianness
    168  * type		DMU object type
    169  * lvl		level of indirection
    170  * birth txg	transaction group in which the block was born
    171  * fill count	number of non-zero blocks under this bp
    172  * checksum[4]	256-bit checksum of the data this bp describes
    173  */
    174 typedef struct blkptr {
    175 	dva_t		blk_dva[3];	/* 128-bit Data Virtual Address	*/
    176 	uint64_t	blk_prop;	/* size, compression, type, etc	*/
    177 	uint64_t	blk_pad[3];	/* Extra space for the future	*/
    178 	uint64_t	blk_birth;	/* transaction group at birth	*/
    179 	uint64_t	blk_fill;	/* fill count			*/
    180 	zio_cksum_t	blk_cksum;	/* 256-bit checksum		*/
    181 } blkptr_t;
    182 
    183 #define	SPA_BLKPTRSHIFT	7		/* blkptr_t is 128 bytes	*/
    184 #define	SPA_DVAS_PER_BP	3		/* Number of DVAs in a bp	*/
    185 
    186 /*
    187  * Macros to get and set fields in a bp or DVA.
    188  */
    189 #define	DVA_GET_ASIZE(dva)	\
    190 	BF64_GET_SB((dva)->dva_word[0], 0, 24, SPA_MINBLOCKSHIFT, 0)
    191 #define	DVA_SET_ASIZE(dva, x)	\
    192 	BF64_SET_SB((dva)->dva_word[0], 0, 24, SPA_MINBLOCKSHIFT, 0, x)
    193 
    194 #define	DVA_GET_GRID(dva)	BF64_GET((dva)->dva_word[0], 24, 8)
    195 #define	DVA_SET_GRID(dva, x)	BF64_SET((dva)->dva_word[0], 24, 8, x)
    196 
    197 #define	DVA_GET_VDEV(dva)	BF64_GET((dva)->dva_word[0], 32, 32)
    198 #define	DVA_SET_VDEV(dva, x)	BF64_SET((dva)->dva_word[0], 32, 32, x)
    199 
    200 #define	DVA_GET_OFFSET(dva)	\
    201 	BF64_GET_SB((dva)->dva_word[1], 0, 63, SPA_MINBLOCKSHIFT, 0)
    202 #define	DVA_SET_OFFSET(dva, x)	\
    203 	BF64_SET_SB((dva)->dva_word[1], 0, 63, SPA_MINBLOCKSHIFT, 0, x)
    204 
    205 #define	DVA_GET_GANG(dva)	BF64_GET((dva)->dva_word[1], 63, 1)
    206 #define	DVA_SET_GANG(dva, x)	BF64_SET((dva)->dva_word[1], 63, 1, x)
    207 
    208 #define	BP_GET_LSIZE(bp)	\
    209 	(BP_IS_HOLE(bp) ? 0 : \
    210 	BF64_GET_SB((bp)->blk_prop, 0, 16, SPA_MINBLOCKSHIFT, 1))
    211 #define	BP_SET_LSIZE(bp, x)	\
    212 	BF64_SET_SB((bp)->blk_prop, 0, 16, SPA_MINBLOCKSHIFT, 1, x)
    213 
    214 #define	BP_GET_PSIZE(bp)	\
    215 	BF64_GET_SB((bp)->blk_prop, 16, 16, SPA_MINBLOCKSHIFT, 1)
    216 #define	BP_SET_PSIZE(bp, x)	\
    217 	BF64_SET_SB((bp)->blk_prop, 16, 16, SPA_MINBLOCKSHIFT, 1, x)
    218 
    219 #define	BP_GET_COMPRESS(bp)	BF64_GET((bp)->blk_prop, 32, 8)
    220 #define	BP_SET_COMPRESS(bp, x)	BF64_SET((bp)->blk_prop, 32, 8, x)
    221 
    222 #define	BP_GET_CHECKSUM(bp)	BF64_GET((bp)->blk_prop, 40, 8)
    223 #define	BP_SET_CHECKSUM(bp, x)	BF64_SET((bp)->blk_prop, 40, 8, x)
    224 
    225 #define	BP_GET_TYPE(bp)		BF64_GET((bp)->blk_prop, 48, 8)
    226 #define	BP_SET_TYPE(bp, x)	BF64_SET((bp)->blk_prop, 48, 8, x)
    227 
    228 #define	BP_GET_LEVEL(bp)	BF64_GET((bp)->blk_prop, 56, 5)
    229 #define	BP_SET_LEVEL(bp, x)	BF64_SET((bp)->blk_prop, 56, 5, x)
    230 
    231 #define	BP_GET_BYTEORDER(bp)	(0 - BF64_GET((bp)->blk_prop, 63, 1))
    232 #define	BP_SET_BYTEORDER(bp, x)	BF64_SET((bp)->blk_prop, 63, 1, x)
    233 
    234 #define	BP_GET_ASIZE(bp)	\
    235 	(DVA_GET_ASIZE(&(bp)->blk_dva[0]) + DVA_GET_ASIZE(&(bp)->blk_dva[1]) + \
    236 		DVA_GET_ASIZE(&(bp)->blk_dva[2]))
    237 
    238 #define	BP_GET_UCSIZE(bp) \
    239 	((BP_GET_LEVEL(bp) > 0 || dmu_ot[BP_GET_TYPE(bp)].ot_metadata) ? \
    240 	BP_GET_PSIZE(bp) : BP_GET_LSIZE(bp));
    241 
    242 #define	BP_GET_NDVAS(bp)	\
    243 	(!!DVA_GET_ASIZE(&(bp)->blk_dva[0]) + \
    244 	!!DVA_GET_ASIZE(&(bp)->blk_dva[1]) + \
    245 	!!DVA_GET_ASIZE(&(bp)->blk_dva[2]))
    246 
    247 #define	BP_COUNT_GANG(bp)	\
    248 	(DVA_GET_GANG(&(bp)->blk_dva[0]) + \
    249 	DVA_GET_GANG(&(bp)->blk_dva[1]) + \
    250 	DVA_GET_GANG(&(bp)->blk_dva[2]))
    251 
    252 #define	DVA_EQUAL(dva1, dva2)	\
    253 	((dva1)->dva_word[1] == (dva2)->dva_word[1] && \
    254 	(dva1)->dva_word[0] == (dva2)->dva_word[0])
    255 
    256 #define	ZIO_CHECKSUM_EQUAL(zc1, zc2) \
    257 	(0 == (((zc1).zc_word[0] - (zc2).zc_word[0]) | \
    258 	((zc1).zc_word[1] - (zc2).zc_word[1]) | \
    259 	((zc1).zc_word[2] - (zc2).zc_word[2]) | \
    260 	((zc1).zc_word[3] - (zc2).zc_word[3])))
    261 
    262 
    263 #define	DVA_IS_VALID(dva)	(DVA_GET_ASIZE(dva) != 0)
    264 
    265 #define	ZIO_SET_CHECKSUM(zcp, w0, w1, w2, w3)	\
    266 {						\
    267 	(zcp)->zc_word[0] = w0;			\
    268 	(zcp)->zc_word[1] = w1;			\
    269 	(zcp)->zc_word[2] = w2;			\
    270 	(zcp)->zc_word[3] = w3;			\
    271 }
    272 
    273 #define	BP_IDENTITY(bp)		(&(bp)->blk_dva[0])
    274 #define	BP_IS_GANG(bp)		DVA_GET_GANG(BP_IDENTITY(bp))
    275 #define	BP_IS_HOLE(bp)		((bp)->blk_birth == 0)
    276 #define	BP_IS_OLDER(bp, txg)	(!BP_IS_HOLE(bp) && (bp)->blk_birth < (txg))
    277 
    278 #define	BP_ZERO_DVAS(bp)			\
    279 {						\
    280 	(bp)->blk_dva[0].dva_word[0] = 0;	\
    281 	(bp)->blk_dva[0].dva_word[1] = 0;	\
    282 	(bp)->blk_dva[1].dva_word[0] = 0;	\
    283 	(bp)->blk_dva[1].dva_word[1] = 0;	\
    284 	(bp)->blk_dva[2].dva_word[0] = 0;	\
    285 	(bp)->blk_dva[2].dva_word[1] = 0;	\
    286 	(bp)->blk_birth = 0;			\
    287 }
    288 
    289 #define	BP_ZERO(bp)				\
    290 {						\
    291 	BP_ZERO_DVAS(bp)			\
    292 	(bp)->blk_prop = 0;			\
    293 	(bp)->blk_pad[0] = 0;			\
    294 	(bp)->blk_pad[1] = 0;			\
    295 	(bp)->blk_pad[2] = 0;			\
    296 	(bp)->blk_fill = 0;			\
    297 	ZIO_SET_CHECKSUM(&(bp)->blk_cksum, 0, 0, 0, 0);	\
    298 }
    299 
    300 /*
    301  * Note: the byteorder is either 0 or -1, both of which are palindromes.
    302  * This simplifies the endianness handling a bit.
    303  */
    304 #ifdef _BIG_ENDIAN
    305 #define	ZFS_HOST_BYTEORDER	(0ULL)
    306 #else
    307 #define	ZFS_HOST_BYTEORDER	(-1ULL)
    308 #endif
    309 
    310 #define	BP_SHOULD_BYTESWAP(bp)	(BP_GET_BYTEORDER(bp) != ZFS_HOST_BYTEORDER)
    311 
    312 #define	BP_SPRINTF_LEN	320
    313 
    314 #include <sys/dmu.h>
    315 
    316 #define	BP_GET_BUFC_TYPE(bp)						\
    317 	(((BP_GET_LEVEL(bp) > 0) || (dmu_ot[BP_GET_TYPE(bp)].ot_metadata)) ? \
    318 	ARC_BUFC_METADATA : ARC_BUFC_DATA);
    319 /*
    320  * Routines found in spa.c
    321  */
    322 
    323 /* state manipulation functions */
    324 extern int spa_open(const char *pool, spa_t **, void *tag);
    325 extern int spa_get_stats(const char *pool, nvlist_t **config,
    326     char *altroot, size_t buflen);
    327 extern int spa_create(const char *pool, nvlist_t *config, nvlist_t *props,
    328     const char *history_str);
    329 extern int spa_import(const char *pool, nvlist_t *config, nvlist_t *props);
    330 extern nvlist_t *spa_tryimport(nvlist_t *tryconfig);
    331 extern int spa_destroy(char *pool);
    332 extern int spa_export(char *pool, nvlist_t **oldconfig);
    333 extern int spa_reset(char *pool);
    334 extern void spa_async_request(spa_t *spa, int flag);
    335 extern void spa_async_suspend(spa_t *spa);
    336 extern void spa_async_resume(spa_t *spa);
    337 extern spa_t *spa_inject_addref(char *pool);
    338 extern void spa_inject_delref(spa_t *spa);
    339 
    340 #define	SPA_ASYNC_REMOVE	0x01
    341 #define	SPA_ASYNC_RESILVER_DONE	0x02
    342 #define	SPA_ASYNC_SCRUB		0x04
    343 #define	SPA_ASYNC_RESILVER	0x08
    344 #define	SPA_ASYNC_CONFIG_UPDATE	0x10
    345 
    346 /* device manipulation */
    347 extern int spa_vdev_add(spa_t *spa, nvlist_t *nvroot);
    348 extern int spa_vdev_attach(spa_t *spa, uint64_t guid, nvlist_t *nvroot,
    349     int replacing);
    350 extern int spa_vdev_detach(spa_t *spa, uint64_t guid, int replace_done);
    351 extern int spa_vdev_remove(spa_t *spa, uint64_t guid, boolean_t unspare);
    352 extern int spa_vdev_setpath(spa_t *spa, uint64_t guid, const char *newpath);
    353 
    354 /* spare state (which is global across all pools) */
    355 extern void spa_spare_add(vdev_t *vd);
    356 extern void spa_spare_remove(vdev_t *vd);
    357 extern boolean_t spa_spare_exists(uint64_t guid, uint64_t *pool);
    358 extern void spa_spare_activate(vdev_t *vd);
    359 
    360 /* L2ARC state (which is global across all pools) */
    361 extern void spa_l2cache_add(vdev_t *vd);
    362 extern void spa_l2cache_remove(vdev_t *vd);
    363 extern boolean_t spa_l2cache_exists(uint64_t guid, uint64_t *pool);
    364 extern void spa_l2cache_activate(vdev_t *vd);
    365 extern void spa_l2cache_drop(spa_t *spa);
    366 extern void spa_l2cache_space_update(vdev_t *vd, int64_t space, int64_t alloc);
    367 
    368 /* scrubbing */
    369 extern int spa_scrub(spa_t *spa, pool_scrub_type_t type, boolean_t force);
    370 extern void spa_scrub_suspend(spa_t *spa);
    371 extern void spa_scrub_resume(spa_t *spa);
    372 extern void spa_scrub_restart(spa_t *spa, uint64_t txg);
    373 
    374 /* spa syncing */
    375 extern void spa_sync(spa_t *spa, uint64_t txg); /* only for DMU use */
    376 extern void spa_sync_allpools(void);
    377 
    378 /*
    379  * SPA configuration functions in spa_config.c
    380  */
    381 
    382 #define	SPA_CONFIG_UPDATE_POOL	0
    383 #define	SPA_CONFIG_UPDATE_VDEVS	1
    384 
    385 extern void spa_config_sync(void);
    386 extern void spa_config_check(const char *, const char *);
    387 extern void spa_config_load(void);
    388 extern nvlist_t *spa_all_configs(uint64_t *);
    389 extern void spa_config_set(spa_t *spa, nvlist_t *config);
    390 extern nvlist_t *spa_config_generate(spa_t *spa, vdev_t *vd, uint64_t txg,
    391     int getstats);
    392 extern void spa_config_update(spa_t *spa, int what);
    393 
    394 /*
    395  * Miscellaneous SPA routines in spa_misc.c
    396  */
    397 
    398 /* Namespace manipulation */
    399 extern spa_t *spa_lookup(const char *name);
    400 extern spa_t *spa_add(const char *name, const char *altroot);
    401 extern void spa_remove(spa_t *spa);
    402 extern spa_t *spa_next(spa_t *prev);
    403 
    404 /* Refcount functions */
    405 extern void spa_open_ref(spa_t *spa, void *tag);
    406 extern void spa_close(spa_t *spa, void *tag);
    407 extern boolean_t spa_refcount_zero(spa_t *spa);
    408 
    409 /* Pool configuration lock */
    410 extern void spa_config_enter(spa_t *spa, krw_t rw, void *tag);
    411 extern void spa_config_exit(spa_t *spa, void *tag);
    412 extern boolean_t spa_config_held(spa_t *spa, krw_t rw);
    413 
    414 /* Pool vdev add/remove lock */
    415 extern uint64_t spa_vdev_enter(spa_t *spa);
    416 extern int spa_vdev_exit(spa_t *spa, vdev_t *vd, uint64_t txg, int error);
    417 
    418 /* Accessor functions */
    419 extern krwlock_t *spa_traverse_rwlock(spa_t *spa);
    420 extern int spa_traverse_wanted(spa_t *spa);
    421 extern struct dsl_pool *spa_get_dsl(spa_t *spa);
    422 extern blkptr_t *spa_get_rootblkptr(spa_t *spa);
    423 extern void spa_set_rootblkptr(spa_t *spa, const blkptr_t *bp);
    424 extern void spa_altroot(spa_t *, char *, size_t);
    425 extern int spa_sync_pass(spa_t *spa);
    426 extern char *spa_name(spa_t *spa);
    427 extern uint64_t spa_guid(spa_t *spa);
    428 extern uint64_t spa_last_synced_txg(spa_t *spa);
    429 extern uint64_t spa_first_txg(spa_t *spa);
    430 extern uint64_t spa_version(spa_t *spa);
    431 extern int spa_state(spa_t *spa);
    432 extern uint64_t spa_freeze_txg(spa_t *spa);
    433 struct metaslab_class;
    434 extern uint64_t spa_get_alloc(spa_t *spa);
    435 extern uint64_t spa_get_space(spa_t *spa);
    436 extern uint64_t spa_get_dspace(spa_t *spa);
    437 extern uint64_t spa_get_asize(spa_t *spa, uint64_t lsize);
    438 extern uint64_t spa_version(spa_t *spa);
    439 extern int spa_max_replication(spa_t *spa);
    440 extern int spa_busy(void);
    441 extern uint8_t spa_get_failmode(spa_t *spa);
    442 
    443 /* Miscellaneous support routines */
    444 extern int spa_rename(const char *oldname, const char *newname);
    445 extern boolean_t spa_guid_exists(uint64_t pool_guid, uint64_t device_guid);
    446 extern char *spa_strdup(const char *);
    447 extern void spa_strfree(char *);
    448 extern uint64_t spa_get_random(uint64_t range);
    449 extern void sprintf_blkptr(char *buf, int len, const blkptr_t *bp);
    450 extern void spa_freeze(spa_t *spa);
    451 extern void spa_upgrade(spa_t *spa, uint64_t version);
    452 extern void spa_evict_all(void);
    453 extern vdev_t *spa_lookup_by_guid(spa_t *spa, uint64_t guid);
    454 extern boolean_t spa_has_spare(spa_t *, uint64_t guid);
    455 extern uint64_t bp_get_dasize(spa_t *spa, const blkptr_t *bp);
    456 extern boolean_t spa_has_slogs(spa_t *spa);
    457 
    458 /* history logging */
    459 typedef enum history_log_type {
    460 	LOG_CMD_POOL_CREATE,
    461 	LOG_CMD_NORMAL,
    462 	LOG_INTERNAL
    463 } history_log_type_t;
    464 
    465 typedef struct history_arg {
    466 	const char *ha_history_str;
    467 	history_log_type_t ha_log_type;
    468 	history_internal_events_t ha_event;
    469 	char ha_zone[MAXPATHLEN];
    470 } history_arg_t;
    471 
    472 extern char *spa_his_ievent_table[];
    473 
    474 extern void spa_history_create_obj(spa_t *spa, dmu_tx_t *tx);
    475 extern int spa_history_get(spa_t *spa, uint64_t *offset, uint64_t *len_read,
    476     char *his_buf);
    477 extern int spa_history_log(spa_t *spa, const char *his_buf,
    478     history_log_type_t what);
    479 void spa_history_internal_log(history_internal_events_t event, spa_t *spa,
    480     dmu_tx_t *tx, cred_t *cr, const char *fmt, ...);
    481 
    482 /* error handling */
    483 struct zbookmark;
    484 struct zio;
    485 extern void spa_log_error(spa_t *spa, struct zio *zio);
    486 extern void zfs_ereport_post(const char *class, spa_t *spa, vdev_t *vd,
    487     struct zio *zio, uint64_t stateoroffset, uint64_t length);
    488 extern void zfs_post_ok(spa_t *spa, vdev_t *vd);
    489 extern void zfs_post_remove(spa_t *spa, vdev_t *vd);
    490 extern void zfs_post_autoreplace(spa_t *spa, vdev_t *vd);
    491 extern uint64_t spa_get_errlog_size(spa_t *spa);
    492 extern int spa_get_errlog(spa_t *spa, void *uaddr, size_t *count);
    493 extern void spa_errlog_rotate(spa_t *spa);
    494 extern void spa_errlog_drain(spa_t *spa);
    495 extern void spa_errlog_sync(spa_t *spa, uint64_t txg);
    496 extern void spa_get_errlists(spa_t *spa, avl_tree_t *last, avl_tree_t *scrub);
    497 
    498 /* Initialization and termination */
    499 extern void spa_init(int flags);
    500 extern void spa_fini(void);
    501 
    502 /* properties */
    503 extern int spa_prop_set(spa_t *spa, nvlist_t *nvp);
    504 extern int spa_prop_get(spa_t *spa, nvlist_t **nvp);
    505 extern void spa_prop_clear_bootfs(spa_t *spa, uint64_t obj, dmu_tx_t *tx);
    506 
    507 /* asynchronous event notification */
    508 extern void spa_event_notify(spa_t *spa, vdev_t *vdev, const char *name);
    509 
    510 #ifdef ZFS_DEBUG
    511 #define	dprintf_bp(bp, fmt, ...) do {				\
    512 	if (zfs_flags & ZFS_DEBUG_DPRINTF) { 			\
    513 	char *__blkbuf = kmem_alloc(BP_SPRINTF_LEN, KM_SLEEP);	\
    514 	sprintf_blkptr(__blkbuf, BP_SPRINTF_LEN, (bp));		\
    515 	dprintf(fmt " %s\n", __VA_ARGS__, __blkbuf);		\
    516 	kmem_free(__blkbuf, BP_SPRINTF_LEN);			\
    517 	} \
    518 _NOTE(CONSTCOND) } while (0)
    519 #else
    520 #define	dprintf_bp(bp, fmt, ...)
    521 #endif
    522 
    523 extern int spa_mode;			/* mode, e.g. FREAD | FWRITE */
    524 
    525 #ifdef	__cplusplus
    526 }
    527 #endif
    528 
    529 #endif	/* _SYS_SPA_H */
    530