aboutsummaryrefslogtreecommitdiffstats
path: root/include/sys/dmu.h
blob: d6efe2595be007790684f8c36a12e4fc5c6094e8 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
/*
 * 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, 2020 by Delphix. All rights reserved.
 * Copyright 2011 Nexenta Systems, Inc. All rights reserved.
 * Copyright (c) 2012, Joyent, Inc. All rights reserved.
 * Copyright 2014 HybridCluster. All rights reserved.
 * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
 * Copyright 2013 Saso Kiselkov. All rights reserved.
 * Copyright (c) 2017, Intel Corporation.
 */

/* Portions Copyright 2010 Robert Milkowski */

#ifndef	_SYS_DMU_H
#define	_SYS_DMU_H

/*
 * This file describes the interface that the DMU provides for its
 * consumers.
 *
 * The DMU also interacts with the SPA.  That interface is described in
 * dmu_spa.h.
 */

#include <sys/zfs_context.h>
#include <sys/inttypes.h>
#include <sys/cred.h>
#include <sys/fs/zfs.h>
#include <sys/zio_compress.h>
#include <sys/zio_priority.h>
#include <sys/uio.h>
#include <sys/zfs_file.h>

#ifdef	__cplusplus
extern "C" {
#endif

struct page;
struct vnode;
struct spa;
struct zilog;
struct zio;
struct blkptr;
struct zap_cursor;
struct dsl_dataset;
struct dsl_pool;
struct dnode;
struct drr_begin;
struct drr_end;
struct zbookmark_phys;
struct spa;
struct nvlist;
struct arc_buf;
struct zio_prop;
struct sa_handle;
struct dsl_crypto_params;
struct locked_range;

typedef struct objset objset_t;
typedef struct dmu_tx dmu_tx_t;
typedef struct dsl_dir dsl_dir_t;
typedef struct dnode dnode_t;

typedef enum dmu_object_byteswap {
	DMU_BSWAP_UINT8,
	DMU_BSWAP_UINT16,
	DMU_BSWAP_UINT32,
	DMU_BSWAP_UINT64,
	DMU_BSWAP_ZAP,
	DMU_BSWAP_DNODE,
	DMU_BSWAP_OBJSET,
	DMU_BSWAP_ZNODE,
	DMU_BSWAP_OLDACL,
	DMU_BSWAP_ACL,
	/*
	 * Allocating a new byteswap type number makes the on-disk format
	 * incompatible with any other format that uses the same number.
	 *
	 * Data can usually be structured to work with one of the
	 * DMU_BSWAP_UINT* or DMU_BSWAP_ZAP types.
	 */
	DMU_BSWAP_NUMFUNCS
} dmu_object_byteswap_t;

#define	DMU_OT_NEWTYPE 0x80
#define	DMU_OT_METADATA 0x40
#define	DMU_OT_ENCRYPTED 0x20
#define	DMU_OT_BYTESWAP_MASK 0x1f

/*
 * Defines a uint8_t object type. Object types specify if the data
 * in the object is metadata (boolean) and how to byteswap the data
 * (dmu_object_byteswap_t). All of the types created by this method
 * are cached in the dbuf metadata cache.
 */
#define	DMU_OT(byteswap, metadata, encrypted) \
	(DMU_OT_NEWTYPE | \
	((metadata) ? DMU_OT_METADATA : 0) | \
	((encrypted) ? DMU_OT_ENCRYPTED : 0) | \
	((byteswap) & DMU_OT_BYTESWAP_MASK))

#define	DMU_OT_IS_VALID(ot) (((ot) & DMU_OT_NEWTYPE) ? \
	((ot) & DMU_OT_BYTESWAP_MASK) < DMU_BSWAP_NUMFUNCS : \
	(ot) < DMU_OT_NUMTYPES)

#define	DMU_OT_IS_METADATA_CACHED(ot) (((ot) & DMU_OT_NEWTYPE) ? \
	B_TRUE : dmu_ot[(ot)].ot_dbuf_metadata_cache)

/*
 * MDB doesn't have dmu_ot; it defines these macros itself.
 */
#ifndef ZFS_MDB
#define	DMU_OT_IS_METADATA_IMPL(ot) (dmu_ot[ot].ot_metadata)
#define	DMU_OT_IS_ENCRYPTED_IMPL(ot) (dmu_ot[ot].ot_encrypt)
#define	DMU_OT_BYTESWAP_IMPL(ot) (dmu_ot[ot].ot_byteswap)
#endif

#define	DMU_OT_IS_METADATA(ot) (((ot) & DMU_OT_NEWTYPE) ? \
	((ot) & DMU_OT_METADATA) : \
	DMU_OT_IS_METADATA_IMPL(ot))

#define	DMU_OT_IS_DDT(ot) \
	((ot) == DMU_OT_DDT_ZAP)

#define	DMU_OT_IS_ZIL(ot) \
	((ot) == DMU_OT_INTENT_LOG)

/* Note: ztest uses DMU_OT_UINT64_OTHER as a proxy for file blocks */
#define	DMU_OT_IS_FILE(ot) \
	((ot) == DMU_OT_PLAIN_FILE_CONTENTS || (ot) == DMU_OT_UINT64_OTHER)

#define	DMU_OT_IS_ENCRYPTED(ot) (((ot) & DMU_OT_NEWTYPE) ? \
	((ot) & DMU_OT_ENCRYPTED) : \
	DMU_OT_IS_ENCRYPTED_IMPL(ot))

/*
 * These object types use bp_fill != 1 for their L0 bp's. Therefore they can't
 * have their data embedded (i.e. use a BP_IS_EMBEDDED() bp), because bp_fill
 * is repurposed for embedded BPs.
 */
#define	DMU_OT_HAS_FILL(ot) \
	((ot) == DMU_OT_DNODE || (ot) == DMU_OT_OBJSET)

#define	DMU_OT_BYTESWAP(ot) (((ot) & DMU_OT_NEWTYPE) ? \
	((ot) & DMU_OT_BYTESWAP_MASK) : \
	DMU_OT_BYTESWAP_IMPL(ot))

typedef enum dmu_object_type {
	DMU_OT_NONE,
	/* general: */
	DMU_OT_OBJECT_DIRECTORY,	/* ZAP */
	DMU_OT_OBJECT_ARRAY,		/* UINT64 */
	DMU_OT_PACKED_NVLIST,		/* UINT8 (XDR by nvlist_pack/unpack) */
	DMU_OT_PACKED_NVLIST_SIZE,	/* UINT64 */
	DMU_OT_BPOBJ,			/* UINT64 */
	DMU_OT_BPOBJ_HDR,		/* UINT64 */
	/* spa: */
	DMU_OT_SPACE_MAP_HEADER,	/* UINT64 */
	DMU_OT_SPACE_MAP,		/* UINT64 */
	/* zil: */
	DMU_OT_INTENT_LOG,		/* UINT64 */
	/* dmu: */
	DMU_OT_DNODE,			/* DNODE */
	DMU_OT_OBJSET,			/* OBJSET */
	/* dsl: */
	DMU_OT_DSL_DIR,			/* UINT64 */
	DMU_OT_DSL_DIR_CHILD_MAP,	/* ZAP */
	DMU_OT_DSL_DS_SNAP_MAP,		/* ZAP */
	DMU_OT_DSL_PROPS,		/* ZAP */
	DMU_OT_DSL_DATASET,		/* UINT64 */
	/* zpl: */
	DMU_OT_ZNODE,			/* ZNODE */
	DMU_OT_OLDACL,			/* Old ACL */
	DMU_OT_PLAIN_FILE_CONTENTS,	/* UINT8 */
	DMU_OT_DIRECTORY_CONTENTS,	/* ZAP */
	DMU_OT_MASTER_NODE,		/* ZAP */
	DMU_OT_UNLINKED_SET,		/* ZAP */
	/* zvol: */
	DMU_OT_ZVOL,			/* UINT8 */
	DMU_OT_ZVOL_PROP,		/* ZAP */
	/* other; for testing only! */
	DMU_OT_PLAIN_OTHER,		/* UINT8 */
	DMU_OT_UINT64_OTHER,		/* UINT64 */
	DMU_OT_ZAP_OTHER,		/* ZAP */
	/* new object types: */
	DMU_OT_ERROR_LOG,		/* ZAP */
	DMU_OT_SPA_HISTORY,		/* UINT8 */
	DMU_OT_SPA_HISTORY_OFFSETS,	/* spa_his_phys_t */
	DMU_OT_POOL_PROPS,		/* ZAP */
	DMU_OT_DSL_PERMS,		/* ZAP */
	DMU_OT_ACL,			/* ACL */
	DMU_OT_SYSACL,			/* SYSACL */
	DMU_OT_FUID,			/* FUID table (Packed NVLIST UINT8) */
	DMU_OT_FUID_SIZE,		/* FUID table size UINT64 */
	DMU_OT_NEXT_CLONES,		/* ZAP */
	DMU_OT_SCAN_QUEUE,		/* ZAP */
	DMU_OT_USERGROUP_USED,		/* ZAP */
	DMU_OT_USERGROUP_QUOTA,		/* ZAP */
	DMU_OT_USERREFS,		/* ZAP */
	DMU_OT_DDT_ZAP,			/* ZAP */
	DMU_OT_DDT_STATS,		/* ZAP */
	DMU_OT_SA,			/* System attr */
	DMU_OT_SA_MASTER_NODE,		/* ZAP */
	DMU_OT_SA_ATTR_REGISTRATION,	/* ZAP */
	DMU_OT_SA_ATTR_LAYOUTS,		/* ZAP */
	DMU_OT_SCAN_XLATE,		/* ZAP */
	DMU_OT_DEDUP,			/* fake dedup BP from ddt_bp_create() */
	DMU_OT_DEADLIST,		/* ZAP */
	DMU_OT_DEADLIST_HDR,		/* UINT64 */
	DMU_OT_DSL_CLONES,		/* ZAP */
	DMU_OT_BPOBJ_SUBOBJ,		/* UINT64 */
	/*
	 * Do not allocate new object types here. Doing so makes the on-disk
	 * format incompatible with any other format that uses the same object
	 * type number.
	 *
	 * When creating an object which does not have one of the above types
	 * use the DMU_OTN_* type with the correct byteswap and metadata
	 * values.
	 *
	 * The DMU_OTN_* types do not have entries in the dmu_ot table,
	 * use the DMU_OT_IS_METADATA() and DMU_OT_BYTESWAP() macros instead
	 * of indexing into dmu_ot directly (this works for both DMU_OT_* types
	 * and DMU_OTN_* types).
	 */
	DMU_OT_NUMTYPES,

	/*
	 * Names for valid types declared with DMU_OT().
	 */
	DMU_OTN_UINT8_DATA = DMU_OT(DMU_BSWAP_UINT8, B_FALSE, B_FALSE),
	DMU_OTN_UINT8_METADATA = DMU_OT(DMU_BSWAP_UINT8, B_TRUE, B_FALSE),
	DMU_OTN_UINT16_DATA = DMU_OT(DMU_BSWAP_UINT16, B_FALSE, B_FALSE),
	DMU_OTN_UINT16_METADATA = DMU_OT(DMU_BSWAP_UINT16, B_TRUE, B_FALSE),
	DMU_OTN_UINT32_DATA = DMU_OT(DMU_BSWAP_UINT32, B_FALSE, B_FALSE),
	DMU_OTN_UINT32_METADATA = DMU_OT(DMU_BSWAP_UINT32, B_TRUE, B_FALSE),
	DMU_OTN_UINT64_DATA = DMU_OT(DMU_BSWAP_UINT64, B_FALSE, B_FALSE),
	DMU_OTN_UINT64_METADATA = DMU_OT(DMU_BSWAP_UINT64, B_TRUE, B_FALSE),
	DMU_OTN_ZAP_DATA = DMU_OT(DMU_BSWAP_ZAP, B_FALSE, B_FALSE),
	DMU_OTN_ZAP_METADATA = DMU_OT(DMU_BSWAP_ZAP, B_TRUE, B_FALSE),

	DMU_OTN_UINT8_ENC_DATA = DMU_OT(DMU_BSWAP_UINT8, B_FALSE, B_TRUE),
	DMU_OTN_UINT8_ENC_METADATA = DMU_OT(DMU_BSWAP_UINT8, B_TRUE, B_TRUE),
	DMU_OTN_UINT16_ENC_DATA = DMU_OT(DMU_BSWAP_UINT16, B_FALSE, B_TRUE),
	DMU_OTN_UINT16_ENC_METADATA = DMU_OT(DMU_BSWAP_UINT16, B_TRUE, B_TRUE),
	DMU_OTN_UINT32_ENC_DATA = DMU_OT(DMU_BSWAP_UINT32, B_FALSE, B_TRUE),
	DMU_OTN_UINT32_ENC_METADATA = DMU_OT(DMU_BSWAP_UINT32, B_TRUE, B_TRUE),
	DMU_OTN_UINT64_ENC_DATA = DMU_OT(DMU_BSWAP_UINT64, B_FALSE, B_TRUE),
	DMU_OTN_UINT64_ENC_METADATA = DMU_OT(DMU_BSWAP_UINT64, B_TRUE, B_TRUE),
	DMU_OTN_ZAP_ENC_DATA = DMU_OT(DMU_BSWAP_ZAP, B_FALSE, B_TRUE),
	DMU_OTN_ZAP_ENC_METADATA = DMU_OT(DMU_BSWAP_ZAP, B_TRUE, B_TRUE),
} dmu_object_type_t;

/*
 * These flags are intended to be used to specify the "txg_how"
 * parameter when calling the dmu_tx_assign() function. See the comment
 * above dmu_tx_assign() for more details on the meaning of these flags.
 */
#define	TXG_NOWAIT	(0ULL)
#define	TXG_WAIT	(1ULL<<0)
#define	TXG_NOTHROTTLE	(1ULL<<1)

void byteswap_uint64_array(void *buf, size_t size);
void byteswap_uint32_array(void *buf, size_t size);
void byteswap_uint16_array(void *buf, size_t size);
void byteswap_uint8_array(void *buf, size_t size);
void zap_byteswap(void *buf, size_t size);
void zfs_oldacl_byteswap(void *buf, size_t size);
void zfs_acl_byteswap(void *buf, size_t size);
void zfs_znode_byteswap(void *buf, size_t size);

#define	DS_FIND_SNAPSHOTS	(1<<0)
#define	DS_FIND_CHILDREN	(1<<1)
#define	DS_FIND_SERIALIZE	(1<<2)

/*
 * The maximum number of bytes that can be accessed as part of one
 * operation, including metadata.
 */
#define	DMU_MAX_ACCESS (64 * 1024 * 1024) /* 64MB */
#define	DMU_MAX_DELETEBLKCNT (20480) /* ~5MB of indirect blocks */

#define	DMU_USERUSED_OBJECT	(-1ULL)
#define	DMU_GROUPUSED_OBJECT	(-2ULL)
#define	DMU_PROJECTUSED_OBJECT	(-3ULL)

/*
 * Zap prefix for object accounting in DMU_{USER,GROUP,PROJECT}USED_OBJECT.
 */
#define	DMU_OBJACCT_PREFIX	"obj-"
#define	DMU_OBJACCT_PREFIX_LEN	4

/*
 * artificial blkids for bonus buffer and spill blocks
 */
#define	DMU_BONUS_BLKID		(-1ULL)
#define	DMU_SPILL_BLKID		(-2ULL)

/*
 * Public routines to create, destroy, open, and close objsets.
 */
typedef void dmu_objset_create_sync_func_t(objset_t *os, void *arg,
    cred_t *cr, dmu_tx_t *tx);

int dmu_objset_hold(const char *name, void *tag, objset_t **osp);
int dmu_objset_own(const char *name, dmu_objset_type_t type,
    boolean_t readonly, boolean_t key_required, void *tag, objset_t **osp);
void dmu_objset_rele(objset_t *os, void *tag);
void dmu_objset_disown(objset_t *os, boolean_t key_required, void *tag);
int dmu_objset_open_ds(struct dsl_dataset *ds, objset_t **osp);

void dmu_objset_evict_dbufs(objset_t *os);
int dmu_objset_create(const char *name, dmu_objset_type_t type, uint64_t flags,
    struct dsl_crypto_params *dcp, dmu_objset_create_sync_func_t func,
    void *arg);
int dmu_objset_clone(const char *name, const char *origin);
int dsl_destroy_snapshots_nvl(struct nvlist *snaps, boolean_t defer,
    struct nvlist *errlist);
int dmu_objset_snapshot_one(const char *fsname, const char *snapname);
int dmu_objset_snapshot_tmp(const char *, const char *, int);
int dmu_objset_find(const char *name, int func(const char *, void *), void *arg,
    int flags);
void dmu_objset_byteswap(void *buf, size_t size);
int dsl_dataset_rename_snapshot(const char *fsname,
    const char *oldsnapname, const char *newsnapname, boolean_t recursive);

typedef struct dmu_buf {
	uint64_t db_object;		/* object that this buffer is part of */
	uint64_t db_offset;		/* byte offset in this object */
	uint64_t db_size;		/* size of buffer in bytes */
	void *db_data;			/* data in buffer */
} dmu_buf_t;

/*
 * The names of zap entries in the DIRECTORY_OBJECT of the MOS.
 */
#define	DMU_POOL_DIRECTORY_OBJECT	1
#define	DMU_POOL_CONFIG			"config"
#define	DMU_POOL_FEATURES_FOR_WRITE	"features_for_write"
#define	DMU_POOL_FEATURES_FOR_READ	"features_for_read"
#define	DMU_POOL_FEATURE_DESCRIPTIONS	"feature_descriptions"
#define	DMU_POOL_FEATURE_ENABLED_TXG	"feature_enabled_txg"
#define	DMU_POOL_ROOT_DATASET		"root_dataset"
#define	DMU_POOL_SYNC_BPOBJ		"sync_bplist"
#define	DMU_POOL_ERRLOG_SCRUB		"errlog_scrub"
#define	DMU_POOL_ERRLOG_LAST		"errlog_last"
#define	DMU_POOL_SPARES			"spares"
#define	DMU_POOL_DEFLATE		"deflate"
#define	DMU_POOL_HISTORY		"history"
#define	DMU_POOL_PROPS			"pool_props"
#define	DMU_POOL_L2CACHE		"l2cache"
#define	DMU_POOL_TMP_USERREFS		"tmp_userrefs"
#define	DMU_POOL_DDT			"DDT-%s-%s-%s"
#define	DMU_POOL_DDT_STATS		"DDT-statistics"
#define	DMU_POOL_CREATION_VERSION	"creation_version"
#define	DMU_POOL_SCAN			"scan"
#define	DMU_POOL_FREE_BPOBJ		"free_bpobj"
#define	DMU_POOL_BPTREE_OBJ		"bptree_obj"
#define	DMU_POOL_EMPTY_BPOBJ		"empty_bpobj"
#define	DMU_POOL_CHECKSUM_SALT		"org.illumos:checksum_salt"
#define	DMU_POOL_VDEV_ZAP_MAP		"com.delphix:vdev_zap_map"
#define	DMU_POOL_REMOVING		"com.delphix:removing"
#define	DMU_POOL_OBSOLETE_BPOBJ		"com.delphix:obsolete_bpobj"
#define	DMU_POOL_CONDENSING_INDIRECT	"com.delphix:condensing_indirect"
#define	DMU_POOL_ZPOOL_CHECKPOINT	"com.delphix:zpool_checkpoint"
#define	DMU_POOL_LOG_SPACEMAP_ZAP	"com.delphix:log_spacemap_zap"
#define	DMU_POOL_DELETED_CLONES		"com.delphix:deleted_clones"

/*
 * Allocate an object from this objset.  The range of object numbers
 * available is (0, DN_MAX_OBJECT).  Object 0 is the meta-dnode.
 *
 * The transaction must be assigned to a txg.  The newly allocated
 * object will be "held" in the transaction (ie. you can modify the
 * newly allocated object in this transaction).
 *
 * dmu_object_alloc() chooses an object and returns it in *objectp.
 *
 * dmu_object_claim() allocates a specific object number.  If that
 * number is already allocated, it fails and returns EEXIST.
 *
 * Return 0 on success, or ENOSPC or EEXIST as specified above.
 */
uint64_t dmu_object_alloc(objset_t *os, dmu_object_type_t ot,
    int blocksize, dmu_object_type_t bonus_type, int bonus_len, dmu_tx_t *tx);
uint64_t dmu_object_alloc_ibs(objset_t *os, dmu_object_type_t ot, int blocksize,
    int indirect_blockshift,
    dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx);
uint64_t dmu_object_alloc_dnsize(objset_t *os, dmu_object_type_t ot,
    int blocksize, dmu_object_type_t bonus_type, int bonus_len,
    int dnodesize, dmu_tx_t *tx);
uint64_t dmu_object_alloc_hold(objset_t *os, dmu_object_type_t ot,
    int blocksize, int indirect_blockshift, dmu_object_type_t bonustype,
    int bonuslen, int dnodesize, dnode_t **allocated_dnode, void *tag,
    dmu_tx_t *tx);
int dmu_object_claim(objset_t *os, uint64_t object, dmu_object_type_t ot,
    int blocksize, dmu_object_type_t bonus_type, int bonus_len, dmu_tx_t *tx);
int dmu_object_claim_dnsize(objset_t *os, uint64_t object, dmu_object_type_t ot,
    int blocksize, dmu_object_type_t bonus_type, int bonus_len,
    int dnodesize, dmu_tx_t *tx);
int dmu_object_reclaim(objset_t *os, uint64_t object, dmu_object_type_t ot,
    int blocksize, dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *txp);
int dmu_object_reclaim_dnsize(objset_t *os, uint64_t object,
    dmu_object_type_t ot, int blocksize, dmu_object_type_t bonustype,
    int bonuslen, int dnodesize, boolean_t keep_spill, dmu_tx_t *tx);
int dmu_object_rm_spill(objset_t *os, uint64_t object, dmu_tx_t *tx);

/*
 * Free an object from this objset.
 *
 * The object's data will be freed as well (ie. you don't need to call
 * dmu_free(object, 0, -1, tx)).
 *
 * The object need not be held in the transaction.
 *
 * If there are any holds on this object's buffers (via dmu_buf_hold()),
 * or tx holds on the object (via dmu_tx_hold_object()), you can not
 * free it; it fails and returns EBUSY.
 *
 * If the object is not allocated, it fails and returns ENOENT.
 *
 * Return 0 on success, or EBUSY or ENOENT as specified above.
 */
int dmu_object_free(objset_t *os, uint64_t object, dmu_tx_t *tx);

/*
 * Find the next allocated or free object.
 *
 * The objectp parameter is in-out.  It will be updated to be the next
 * object which is allocated.  Ignore objects which have not been
 * modified since txg.
 *
 * XXX Can only be called on a objset with no dirty data.
 *
 * Returns 0 on success, or ENOENT if there are no more objects.
 */
int dmu_object_next(objset_t *os, uint64_t *objectp,
    boolean_t hole, uint64_t txg);

/*
 * Set the number of levels on a dnode. nlevels must be greater than the
 * current number of levels or an EINVAL will be returned.
 */
int dmu_object_set_nlevels(objset_t *os, uint64_t object, int nlevels,
    dmu_tx_t *tx);

/*
 * Set the data blocksize for an object.
 *
 * The object cannot have any blocks allocated beyond the first.  If
 * the first block is allocated already, the new size must be greater
 * than the current block size.  If these conditions are not met,
 * ENOTSUP will be returned.
 *
 * Returns 0 on success, or EBUSY if there are any holds on the object
 * contents, or ENOTSUP as described above.
 */
int dmu_object_set_blocksize(objset_t *os, uint64_t object, uint64_t size,
    int ibs, dmu_tx_t *tx);

/*
 * Manually set the maxblkid on a dnode. This will adjust nlevels accordingly
 * to accommodate the change. When calling this function, the caller must
 * ensure that the object's nlevels can sufficiently support the new maxblkid.
 */
int dmu_object_set_maxblkid(objset_t *os, uint64_t object, uint64_t maxblkid,
    dmu_tx_t *tx);

/*
 * Set the checksum property on a dnode.  The new checksum algorithm will
 * apply to all newly written blocks; existing blocks will not be affected.
 */
void dmu_object_set_checksum(objset_t *os, uint64_t object, uint8_t checksum,
    dmu_tx_t *tx);

/*
 * Set the compress property on a dnode.  The new compression algorithm will
 * apply to all newly written blocks; existing blocks will not be affected.
 */
void dmu_object_set_compress(objset_t *os, uint64_t object, uint8_t compress,
    dmu_tx_t *tx);

void dmu_write_embedded(objset_t *os, uint64_t object, uint64_t offset,
    void *data, uint8_t etype, uint8_t comp, int uncompressed_size,
    int compressed_size, int byteorder, dmu_tx_t *tx);
void dmu_redact(objset_t *os, uint64_t object, uint64_t offset, uint64_t size,
    dmu_tx_t *tx);

/*
 * Decide how to write a block: checksum, compression, number of copies, etc.
 */
#define	WP_NOFILL	0x1
#define	WP_DMU_SYNC	0x2
#define	WP_SPILL	0x4

void dmu_write_policy(objset_t *os, dnode_t *dn, int level, int wp,
    struct zio_prop *zp);

/*
 * The bonus data is accessed more or less like a regular buffer.
 * You must dmu_bonus_hold() to get the buffer, which will give you a
 * dmu_buf_t with db_offset==-1ULL, and db_size = the size of the bonus
 * data.  As with any normal buffer, you must call dmu_buf_will_dirty()
 * before modifying it, and the
 * object must be held in an assigned transaction before calling
 * dmu_buf_will_dirty.  You may use dmu_buf_set_user() on the bonus
 * buffer as well.  You must release what you hold with dmu_buf_rele().
 *
 * Returns ENOENT, EIO, or 0.
 */
int dmu_bonus_hold(objset_t *os, uint64_t object, void *tag, dmu_buf_t **dbp);
int dmu_bonus_hold_by_dnode(dnode_t *dn, void *tag, dmu_buf_t **dbp,
    uint32_t flags);
int dmu_bonus_max(void);
int dmu_set_bonus(dmu_buf_t *, int, dmu_tx_t *);
int dmu_set_bonustype(dmu_buf_t *, dmu_object_type_t, dmu_tx_t *);
dmu_object_type_t dmu_get_bonustype(dmu_buf_t *);
int dmu_rm_spill(objset_t *, uint64_t, dmu_tx_t *);

/*
 * Special spill buffer support used by "SA" framework
 */

int dmu_spill_hold_by_bonus(dmu_buf_t *bonus, uint32_t flags, void *tag,
    dmu_buf_t **dbp);
int dmu_spill_hold_by_dnode(dnode_t *dn, uint32_t flags,
    void *tag, dmu_buf_t **dbp);
int dmu_spill_hold_existing(dmu_buf_t *bonus, void *tag, dmu_buf_t **dbp);

/*
 * Obtain the DMU buffer from the specified object which contains the
 * specified offset.  dmu_buf_hold() puts a "hold" on the buffer, so
 * that it will remain in memory.  You must release the hold with
 * dmu_buf_rele().  You must not access the dmu_buf_t after releasing
 * what you hold.  You must have a hold on any dmu_buf_t* you pass to the DMU.
 *
 * You must call dmu_buf_read, dmu_buf_will_dirty, or dmu_buf_will_fill
 * on the returned buffer before reading or writing the buffer's
 * db_data.  The comments for those routines describe what particular
 * operations are valid after calling them.
 *
 * The object number must be a valid, allocated object number.
 */
int dmu_buf_hold(objset_t *os, uint64_t object, uint64_t offset,
    void *tag, dmu_buf_t **, int flags);
int dmu_buf_hold_by_dnode(dnode_t *dn, uint64_t offset,
    void *tag, dmu_buf_t **dbp, int flags);
int dmu_buf_hold_array_by_dnode(dnode_t *dn, uint64_t offset,
    uint64_t length, boolean_t read, void *tag, int *numbufsp,
    dmu_buf_t ***dbpp, uint32_t flags);
/*
 * Add a reference to a dmu buffer that has already been held via
 * dmu_buf_hold() in the current context.
 */
void dmu_buf_add_ref(dmu_buf_t *db, void* tag);

/*
 * Attempt to add a reference to a dmu buffer that is in an unknown state,
 * using a pointer that may have been invalidated by eviction processing.
 * The request will succeed if the passed in dbuf still represents the
 * same os/object/blkid, is ineligible for eviction, and has at least
 * one hold by a user other than the syncer.
 */
boolean_t dmu_buf_try_add_ref(dmu_buf_t *, objset_t *os, uint64_t object,
    uint64_t blkid, void *tag);

void dmu_buf_rele(dmu_buf_t *db, void *tag);
uint64_t dmu_buf_refcount(dmu_buf_t *db);
uint64_t dmu_buf_user_refcount(dmu_buf_t *db);

/*
 * dmu_buf_hold_array holds the DMU buffers which contain all bytes in a
 * range of an object.  A pointer to an array of dmu_buf_t*'s is
 * returned (in *dbpp).
 *
 * dmu_buf_rele_array releases the hold on an array of dmu_buf_t*'s, and
 * frees the array.  The hold on the array of buffers MUST be released
 * with dmu_buf_rele_array.  You can NOT release the hold on each buffer
 * individually with dmu_buf_rele.
 */
int dmu_buf_hold_array_by_bonus(dmu_buf_t *db, uint64_t offset,
    uint64_t length, boolean_t read, void *tag,
    int *numbufsp, dmu_buf_t ***dbpp);
void dmu_buf_rele_array(dmu_buf_t **, int numbufs, void *tag);

typedef void dmu_buf_evict_func_t(void *user_ptr);

/*
 * A DMU buffer user object may be associated with a dbuf for the
 * duration of its lifetime.  This allows the user of a dbuf (client)
 * to attach private data to a dbuf (e.g. in-core only data such as a
 * dnode_children_t, zap_t, or zap_leaf_t) and be optionally notified
 * when that dbuf has been evicted.  Clients typically respond to the
 * eviction notification by freeing their private data, thus ensuring
 * the same lifetime for both dbuf and private data.
 *
 * The mapping from a dmu_buf_user_t to any client private data is the
 * client's responsibility.  All current consumers of the API with private
 * data embed a dmu_buf_user_t as the first member of the structure for
 * their private data.  This allows conversions between the two types
 * with a simple cast.  Since the DMU buf user API never needs access
 * to the private data, other strategies can be employed if necessary
 * or convenient for the client (e.g. using container_of() to do the
 * conversion for private data that cannot have the dmu_buf_user_t as
 * its first member).
 *
 * Eviction callbacks are executed without the dbuf mutex held or any
 * other type of mechanism to guarantee that the dbuf is still available.
 * For this reason, users must assume the dbuf has already been freed
 * and not reference the dbuf from the callback context.
 *
 * Users requesting "immediate eviction" are notified as soon as the dbuf
 * is only referenced by dirty records (dirties == holds).  Otherwise the
 * notification occurs after eviction processing for the dbuf begins.
 */
typedef struct dmu_buf_user {
	/*
	 * Asynchronous user eviction callback state.
	 */
	taskq_ent_t	dbu_tqent;

	/*
	 * This instance's eviction function pointers.
	 *
	 * dbu_evict_func_sync is called synchronously and then
	 * dbu_evict_func_async is executed asynchronously on a taskq.
	 */
	dmu_buf_evict_func_t *dbu_evict_func_sync;
	dmu_buf_evict_func_t *dbu_evict_func_async;
#ifdef ZFS_DEBUG
	/*
	 * Pointer to user's dbuf pointer.  NULL for clients that do
	 * not associate a dbuf with their user data.
	 *
	 * The dbuf pointer is cleared upon eviction so as to catch
	 * use-after-evict bugs in clients.
	 */
	dmu_buf_t **dbu_clear_on_evict_dbufp;
#endif
} dmu_buf_user_t;

/*
 * Initialize the given dmu_buf_user_t instance with the eviction function
 * evict_func, to be called when the user is evicted.
 *
 * NOTE: This function should only be called once on a given dmu_buf_user_t.
 *       To allow enforcement of this, dbu must already be zeroed on entry.
 */
/*ARGSUSED*/
static inline void
dmu_buf_init_user(dmu_buf_user_t *dbu, dmu_buf_evict_func_t *evict_func_sync,
    dmu_buf_evict_func_t *evict_func_async,
    dmu_buf_t **clear_on_evict_dbufp __maybe_unused)
{
	ASSERT(dbu->dbu_evict_func_sync == NULL);
	ASSERT(dbu->dbu_evict_func_async == NULL);

	/* must have at least one evict func */
	IMPLY(evict_func_sync == NULL, evict_func_async != NULL);
	dbu->dbu_evict_func_sync = evict_func_sync;
	dbu->dbu_evict_func_async = evict_func_async;
	taskq_init_ent(&dbu->dbu_tqent);
#ifdef ZFS_DEBUG
	dbu->dbu_clear_on_evict_dbufp = clear_on_evict_dbufp;
#endif
}

/*
 * Attach user data to a dbuf and mark it for normal (when the dbuf's
 * data is cleared or its reference count goes to zero) eviction processing.
 *
 * Returns NULL on success, or the existing user if another user currently
 * owns the buffer.
 */
void *dmu_buf_set_user(dmu_buf_t *db, dmu_buf_user_t *user);

/*
 * Attach user data to a dbuf and mark it for immediate (its dirty and
 * reference counts are equal) eviction processing.
 *
 * Returns NULL on success, or the existing user if another user currently
 * owns the buffer.
 */
void *dmu_buf_set_user_ie(dmu_buf_t *db, dmu_buf_user_t *user);

/*
 * Replace the current user of a dbuf.
 *
 * If given the current user of a dbuf, replaces the dbuf's user with
 * "new_user" and returns the user data pointer that was replaced.
 * Otherwise returns the current, and unmodified, dbuf user pointer.
 */
void *dmu_buf_replace_user(dmu_buf_t *db,
    dmu_buf_user_t *old_user, dmu_buf_user_t *new_user);

/*
 * Remove the specified user data for a DMU buffer.
 *
 * Returns the user that was removed on success, or the current user if
 * another user currently owns the buffer.
 */
void *dmu_buf_remove_user(dmu_buf_t *db, dmu_buf_user_t *user);

/*
 * Returns the user data (dmu_buf_user_t *) associated with this dbuf.
 */
void *dmu_buf_get_user(dmu_buf_t *db);

objset_t *dmu_buf_get_objset(dmu_buf_t *db);
dnode_t *dmu_buf_dnode_enter(dmu_buf_t *db);
void dmu_buf_dnode_exit(dmu_buf_t *db);

/* Block until any in-progress dmu buf user evictions complete. */
void dmu_buf_user_evict_wait(void);

/*
 * Returns the blkptr associated with this dbuf, or NULL if not set.
 */
struct blkptr *dmu_buf_get_blkptr(dmu_buf_t *db);

/*
 * Indicate that you are going to modify the buffer's data (db_data).
 *
 * The transaction (tx) must be assigned to a txg (ie. you've called
 * dmu_tx_assign()).  The buffer's object must be held in the tx
 * (ie. you've called dmu_tx_hold_object(tx, db->db_object)).
 */
void dmu_buf_will_dirty(dmu_buf_t *db, dmu_tx_t *tx);
boolean_t dmu_buf_is_dirty(dmu_buf_t *db, dmu_tx_t *tx);
void dmu_buf_set_crypt_params(dmu_buf_t *db_fake, boolean_t byteorder,
    const uint8_t *salt, const uint8_t *iv, const uint8_t *mac, dmu_tx_t *tx);

/*
 * You must create a transaction, then hold the objects which you will
 * (or might) modify as part of this transaction.  Then you must assign
 * the transaction to a transaction group.  Once the transaction has
 * been assigned, you can modify buffers which belong to held objects as
 * part of this transaction.  You can't modify buffers before the
 * transaction has been assigned; you can't modify buffers which don't
 * belong to objects which this transaction holds; you can't hold
 * objects once the transaction has been assigned.  You may hold an
 * object which you are going to free (with dmu_object_free()), but you
 * don't have to.
 *
 * You can abort the transaction before it has been assigned.
 *
 * Note that you may hold buffers (with dmu_buf_hold) at any time,
 * regardless of transaction state.
 */

#define	DMU_NEW_OBJECT	(-1ULL)
#define	DMU_OBJECT_END	(-1ULL)

dmu_tx_t *dmu_tx_create(objset_t *os);
void dmu_tx_hold_write(dmu_tx_t *tx, uint64_t object, uint64_t off, int len);
void dmu_tx_hold_write_by_dnode(dmu_tx_t *tx, dnode_t *dn, uint64_t off,
    int len);
void dmu_tx_hold_free(dmu_tx_t *tx, uint64_t object, uint64_t off,
    uint64_t len);
void dmu_tx_hold_free_by_dnode(dmu_tx_t *tx, dnode_t *dn, uint64_t off,
    uint64_t len);
void dmu_tx_hold_zap(dmu_tx_t *tx, uint64_t object, int add, const char *name);
void dmu_tx_hold_zap_by_dnode(dmu_tx_t *tx, dnode_t *dn, int add,
    const char *name);
void dmu_tx_hold_bonus(dmu_tx_t *tx, uint64_t object);
void dmu_tx_hold_bonus_by_dnode(dmu_tx_t *tx, dnode_t *dn);
void dmu_tx_hold_spill(dmu_tx_t *tx, uint64_t object);
void dmu_tx_hold_sa(dmu_tx_t *tx, struct sa_handle *hdl, boolean_t may_grow);
void dmu_tx_hold_sa_create(dmu_tx_t *tx, int total_size);
void dmu_tx_abort(dmu_tx_t *tx);
int dmu_tx_assign(dmu_tx_t *tx, uint64_t txg_how);
void dmu_tx_wait(dmu_tx_t *tx);
void dmu_tx_commit(dmu_tx_t *tx);
void dmu_tx_mark_netfree(dmu_tx_t *tx);

/*
 * To register a commit callback, dmu_tx_callback_register() must be called.
 *
 * dcb_data is a pointer to caller private data that is passed on as a
 * callback parameter. The caller is responsible for properly allocating and
 * freeing it.
 *
 * When registering a callback, the transaction must be already created, but
 * it cannot be committed or aborted. It can be assigned to a txg or not.
 *
 * The callback will be called after the transaction has been safely written
 * to stable storage and will also be called if the dmu_tx is aborted.
 * If there is any error which prevents the transaction from being committed to
 * disk, the callback will be called with a value of error != 0.
 *
 * When multiple callbacks are registered to the transaction, the callbacks
 * will be called in reverse order to let Lustre, the only user of commit
 * callback currently, take the fast path of its commit callback handling.
 */
typedef void dmu_tx_callback_func_t(void *dcb_data, int error);

void dmu_tx_callback_register(dmu_tx_t *tx, dmu_tx_callback_func_t *dcb_func,
    void *dcb_data);
void dmu_tx_do_callbacks(list_t *cb_list, int error);

/*
 * Free up the data blocks for a defined range of a file.  If size is
 * -1, the range from offset to end-of-file is freed.
 */
int dmu_free_range(objset_t *os, uint64_t object, uint64_t offset,
    uint64_t size, dmu_tx_t *tx);
int dmu_free_long_range(objset_t *os, uint64_t object, uint64_t offset,
    uint64_t size);
int dmu_free_long_object(objset_t *os, uint64_t object);

/*
 * Convenience functions.
 *
 * Canfail routines will return 0 on success, or an errno if there is a
 * nonrecoverable I/O error.
 */
#define	DMU_READ_PREFETCH	0 /* prefetch */
#define	DMU_READ_NO_PREFETCH	1 /* don't prefetch */
#define	DMU_READ_NO_DECRYPT	2 /* don't decrypt */
int dmu_read(objset_t *os, uint64_t object, uint64_t offset, uint64_t size,
	void *buf, uint32_t flags);
int dmu_read_by_dnode(dnode_t *dn, uint64_t offset, uint64_t size, void *buf,
    uint32_t flags);
void dmu_write(objset_t *os, uint64_t object, uint64_t offset, uint64_t size,
	const void *buf, dmu_tx_t *tx);
void dmu_write_by_dnode(dnode_t *dn, uint64_t offset, uint64_t size,
    const void *buf, dmu_tx_t *tx);
void dmu_prealloc(objset_t *os, uint64_t object, uint64_t offset, uint64_t size,
	dmu_tx_t *tx);
#ifdef _KERNEL
int dmu_read_uio(objset_t *os, uint64_t object, struct uio *uio, uint64_t size);
int dmu_read_uio_dbuf(dmu_buf_t *zdb, struct uio *uio, uint64_t size);
int dmu_read_uio_dnode(dnode_t *dn, struct uio *uio, uint64_t size);
int dmu_write_uio(objset_t *os, uint64_t object, struct uio *uio, uint64_t size,
	dmu_tx_t *tx);
int dmu_write_uio_dbuf(dmu_buf_t *zdb, struct uio *uio, uint64_t size,
	dmu_tx_t *tx);
int dmu_write_uio_dnode(dnode_t *dn, struct uio *uio, uint64_t size,
	dmu_tx_t *tx);
#endif
struct arc_buf *dmu_request_arcbuf(dmu_buf_t *handle, int size);
void dmu_return_arcbuf(struct arc_buf *buf);
int dmu_assign_arcbuf_by_dnode(dnode_t *dn, uint64_t offset,
    struct arc_buf *buf, dmu_tx_t *tx);
int dmu_assign_arcbuf_by_dbuf(dmu_buf_t *handle, uint64_t offset,
    struct arc_buf *buf, dmu_tx_t *tx);
#define	dmu_assign_arcbuf	dmu_assign_arcbuf_by_dbuf
#ifdef HAVE_UIO_ZEROCOPY
int dmu_xuio_init(struct xuio *uio, int niov);
void dmu_xuio_fini(struct xuio *uio);
int dmu_xuio_add(struct xuio *uio, struct arc_buf *abuf, offset_t off,
    size_t n);
int dmu_xuio_cnt(struct xuio *uio);
struct arc_buf *dmu_xuio_arcbuf(struct xuio *uio, int i);
void dmu_xuio_clear(struct xuio *uio, int i);
#endif /* HAVE_UIO_ZEROCOPY */
void xuio_stat_wbuf_copied(void);
void xuio_stat_wbuf_nocopy(void);

extern int zfs_prefetch_disable;
extern int zfs_max_recordsize;

/*
 * Asynchronously try to read in the data.
 */
void dmu_prefetch(objset_t *os, uint64_t object, int64_t level, uint64_t offset,
	uint64_t len, enum zio_priority pri);

typedef struct dmu_object_info {
	/* All sizes are in bytes unless otherwise indicated. */
	uint32_t doi_data_block_size;
	uint32_t doi_metadata_block_size;
	dmu_object_type_t doi_type;
	dmu_object_type_t doi_bonus_type;
	uint64_t doi_bonus_size;
	uint8_t doi_indirection;		/* 2 = dnode->indirect->data */
	uint8_t doi_checksum;
	uint8_t doi_compress;
	uint8_t doi_nblkptr;
	uint8_t doi_pad[4];
	uint64_t doi_dnodesize;
	uint64_t doi_physical_blocks_512;	/* data + metadata, 512b blks */
	uint64_t doi_max_offset;
	uint64_t doi_fill_count;		/* number of non-empty blocks */
} dmu_object_info_t;

typedef void (*const arc_byteswap_func_t)(void *buf, size_t size);

typedef struct dmu_object_type_info {
	dmu_object_byteswap_t	ot_byteswap;
	boolean_t		ot_metadata;
	boolean_t		ot_dbuf_metadata_cache;
	boolean_t		ot_encrypt;
	char			*ot_name;
} dmu_object_type_info_t;

typedef const struct dmu_object_byteswap_info {
	arc_byteswap_func_t	 ob_func;
	char			*ob_name;
} dmu_object_byteswap_info_t;

extern const dmu_object_type_info_t dmu_ot[DMU_OT_NUMTYPES];
extern const dmu_object_byteswap_info_t dmu_ot_byteswap[DMU_BSWAP_NUMFUNCS];

/*
 * Get information on a DMU object.
 *
 * Return 0 on success or ENOENT if object is not allocated.
 *
 * If doi is NULL, just indicates whether the object exists.
 */
int dmu_object_info(objset_t *os, uint64_t object, dmu_object_info_t *doi);
void __dmu_object_info_from_dnode(struct dnode *dn, dmu_object_info_t *doi);
/* Like dmu_object_info, but faster if you have a held dnode in hand. */
void dmu_object_info_from_dnode(dnode_t *dn, dmu_object_info_t *doi);
/* Like dmu_object_info, but faster if you have a held dbuf in hand. */
void dmu_object_info_from_db(dmu_buf_t *db, dmu_object_info_t *doi);
/*
 * Like dmu_object_info_from_db, but faster still when you only care about
 * the size.
 */
void dmu_object_size_from_db(dmu_buf_t *db, uint32_t *blksize,
    u_longlong_t *nblk512);

void dmu_object_dnsize_from_db(dmu_buf_t *db, int *dnsize);

typedef struct dmu_objset_stats {
	uint64_t dds_num_clones; /* number of clones of this */
	uint64_t dds_creation_txg;
	uint64_t dds_guid;
	dmu_objset_type_t dds_type;
	uint8_t dds_is_snapshot;
	uint8_t dds_inconsistent;
	uint8_t dds_redacted;
	char dds_origin[ZFS_MAX_DATASET_NAME_LEN];
} dmu_objset_stats_t;

/*
 * Get stats on a dataset.
 */
void dmu_objset_fast_stat(objset_t *os, dmu_objset_stats_t *stat);

/*
 * Add entries to the nvlist for all the objset's properties.  See
 * zfs_prop_table[] and zfs(1m) for details on the properties.
 */
void dmu_objset_stats(objset_t *os, struct nvlist *nv);

/*
 * Get the space usage statistics for statvfs().
 *
 * refdbytes is the amount of space "referenced" by this objset.
 * availbytes is the amount of space available to this objset, taking
 * into account quotas & reservations, assuming that no other objsets
 * use the space first.  These values correspond to the 'referenced' and
 * 'available' properties, described in the zfs(1m) manpage.
 *
 * usedobjs and availobjs are the number of objects currently allocated,
 * and available.
 */
void dmu_objset_space(objset_t *os, uint64_t *refdbytesp, uint64_t *availbytesp,
    uint64_t *usedobjsp, uint64_t *availobjsp);

/*
 * The fsid_guid is a 56-bit ID that can change to avoid collisions.
 * (Contrast with the ds_guid which is a 64-bit ID that will never
 * change, so there is a small probability that it will collide.)
 */
uint64_t dmu_objset_fsid_guid(objset_t *os);

/*
 * Get the [cm]time for an objset's snapshot dir
 */
inode_timespec_t dmu_objset_snap_cmtime(objset_t *os);

int dmu_objset_is_snapshot(objset_t *os);

extern struct spa *dmu_objset_spa(objset_t *os);
extern struct zilog *dmu_objset_zil(objset_t *os);
extern struct dsl_pool *dmu_objset_pool(objset_t *os);
extern struct dsl_dataset *dmu_objset_ds(objset_t *os);
extern void dmu_objset_name(objset_t *os, char *buf);
extern dmu_objset_type_t dmu_objset_type(objset_t *os);
extern uint64_t dmu_objset_id(objset_t *os);
extern uint64_t dmu_objset_dnodesize(objset_t *os);
extern zfs_sync_type_t dmu_objset_syncprop(objset_t *os);
extern zfs_logbias_op_t dmu_objset_logbias(objset_t *os);
extern int dmu_objset_blksize(objset_t *os);
extern int dmu_snapshot_list_next(objset_t *os, int namelen, char *name,
    uint64_t *id, uint64_t *offp, boolean_t *case_conflict);
extern int dmu_snapshot_lookup(objset_t *os, const char *name, uint64_t *val);
extern int dmu_snapshot_realname(objset_t *os, char *name, char *real,
    int maxlen, boolean_t *conflict);
extern int dmu_dir_list_next(objset_t *os, int namelen, char *name,
    uint64_t *idp, uint64_t *offp);

typedef struct zfs_file_info {
	uint64_t zfi_user;
	uint64_t zfi_group;
	uint64_t zfi_project;
	uint64_t zfi_generation;
} zfs_file_info_t;

typedef int file_info_cb_t(dmu_object_type_t bonustype, const void *data,
    struct zfs_file_info *zoi);
extern void dmu_objset_register_type(dmu_objset_type_t ost,
    file_info_cb_t *cb);
extern void dmu_objset_set_user(objset_t *os, void *user_ptr);
extern void *dmu_objset_get_user(objset_t *os);

/*
 * Return the txg number for the given assigned transaction.
 */
uint64_t dmu_tx_get_txg(dmu_tx_t *tx);

/*
 * Synchronous write.
 * If a parent zio is provided this function initiates a write on the
 * provided buffer as a child of the parent zio.
 * In the absence of a parent zio, the write is completed synchronously.
 * At write completion, blk is filled with the bp of the written block.
 * Note that while the data covered by this function will be on stable
 * storage when the write completes this new data does not become a
 * permanent part of the file until the associated transaction commits.
 */

/*
 * {zfs,zvol,ztest}_get_done() args
 */
typedef struct zgd {
	struct lwb	*zgd_lwb;
	struct blkptr	*zgd_bp;
	dmu_buf_t	*zgd_db;
	struct zfs_locked_range *zgd_lr;
	void		*zgd_private;
} zgd_t;

typedef void dmu_sync_cb_t(zgd_t *arg, int error);
int dmu_sync(struct zio *zio, uint64_t txg, dmu_sync_cb_t *done, zgd_t *zgd);

/*
 * Find the next hole or data block in file starting at *off
 * Return found offset in *off. Return ESRCH for end of file.
 */
int dmu_offset_next(objset_t *os, uint64_t object, boolean_t hole,
    uint64_t *off);

/*
 * Initial setup and final teardown.
 */
extern void dmu_init(void);
extern void dmu_fini(void);

typedef void (*dmu_traverse_cb_t)(objset_t *os, void *arg, struct blkptr *bp,
    uint64_t object, uint64_t offset, int len);
void dmu_traverse_objset(objset_t *os, uint64_t txg_start,
    dmu_traverse_cb_t cb, void *arg);

int dmu_diff(const char *tosnap_name, const char *fromsnap_name,
    zfs_file_t *fp, offset_t *offp);

/* CRC64 table */
#define	ZFS_CRC64_POLY	0xC96C5795D7870F42ULL	/* ECMA-182, reflected form */
extern uint64_t zfs_crc64_table[256];

#ifdef	__cplusplus
}
#endif

#endif	/* _SYS_DMU_H */