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 /*
23 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Copyright (c) 2011, 2017 by Delphix. All rights reserved.
25 * Copyright 2011 Nexenta Systems, Inc. All rights reserved.
26 * Copyright (c) 2012, Joyent, Inc. All rights reserved.
27 * Copyright 2013 DEY Storage Systems, Inc.
28 * Copyright 2014 HybridCluster. All rights reserved.
29 * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
30 * Copyright 2013 Saso Kiselkov. All rights reserved.
31 * Copyright (c) 2014 Integros [integros.com]
32 */
33
34 /* Portions Copyright 2010 Robert Milkowski */
35
36 #ifndef _SYS_DMU_H
37 #define _SYS_DMU_H
38
39 /*
40 * This file describes the interface that the DMU provides for its
41 * consumers.
42 *
43 * The DMU also interacts with the SPA. That interface is described in
44 * dmu_spa.h.
45 */
92 DMU_BSWAP_ZNODE,
93 DMU_BSWAP_OLDACL,
94 DMU_BSWAP_ACL,
95 /*
96 * Allocating a new byteswap type number makes the on-disk format
97 * incompatible with any other format that uses the same number.
98 *
99 * Data can usually be structured to work with one of the
100 * DMU_BSWAP_UINT* or DMU_BSWAP_ZAP types.
101 */
102 DMU_BSWAP_NUMFUNCS
103 } dmu_object_byteswap_t;
104
105 #define DMU_OT_NEWTYPE 0x80
106 #define DMU_OT_METADATA 0x40
107 #define DMU_OT_BYTESWAP_MASK 0x3f
108
109 /*
110 * Defines a uint8_t object type. Object types specify if the data
111 * in the object is metadata (boolean) and how to byteswap the data
112 * (dmu_object_byteswap_t).
113 */
114 #define DMU_OT(byteswap, metadata) \
115 (DMU_OT_NEWTYPE | \
116 ((metadata) ? DMU_OT_METADATA : 0) | \
117 ((byteswap) & DMU_OT_BYTESWAP_MASK))
118
119 #define DMU_OT_IS_VALID(ot) (((ot) & DMU_OT_NEWTYPE) ? \
120 ((ot) & DMU_OT_BYTESWAP_MASK) < DMU_BSWAP_NUMFUNCS : \
121 (ot) < DMU_OT_NUMTYPES)
122
123 #define DMU_OT_IS_METADATA(ot) (((ot) & DMU_OT_NEWTYPE) ? \
124 ((ot) & DMU_OT_METADATA) : \
125 dmu_ot[(ot)].ot_metadata)
126
127 /*
128 * These object types use bp_fill != 1 for their L0 bp's. Therefore they can't
129 * have their data embedded (i.e. use a BP_IS_EMBEDDED() bp), because bp_fill
130 * is repurposed for embedded BPs.
131 */
132 #define DMU_OT_HAS_FILL(ot) \
133 ((ot) == DMU_OT_DNODE || (ot) == DMU_OT_OBJSET)
134
135 #define DMU_OT_BYTESWAP(ot) (((ot) & DMU_OT_NEWTYPE) ? \
136 ((ot) & DMU_OT_BYTESWAP_MASK) : \
137 dmu_ot[(ot)].ot_byteswap)
138
139 typedef enum dmu_object_type {
140 DMU_OT_NONE,
141 /* general: */
142 DMU_OT_OBJECT_DIRECTORY, /* ZAP */
143 DMU_OT_OBJECT_ARRAY, /* UINT64 */
144 DMU_OT_PACKED_NVLIST, /* UINT8 (XDR by nvlist_pack/unpack) */
145 DMU_OT_PACKED_NVLIST_SIZE, /* UINT64 */
146 DMU_OT_BPOBJ, /* UINT64 */
214 * of indexing into dmu_ot directly (this works for both DMU_OT_* types
215 * and DMU_OTN_* types).
216 */
217 DMU_OT_NUMTYPES,
218
219 /*
220 * Names for valid types declared with DMU_OT().
221 */
222 DMU_OTN_UINT8_DATA = DMU_OT(DMU_BSWAP_UINT8, B_FALSE),
223 DMU_OTN_UINT8_METADATA = DMU_OT(DMU_BSWAP_UINT8, B_TRUE),
224 DMU_OTN_UINT16_DATA = DMU_OT(DMU_BSWAP_UINT16, B_FALSE),
225 DMU_OTN_UINT16_METADATA = DMU_OT(DMU_BSWAP_UINT16, B_TRUE),
226 DMU_OTN_UINT32_DATA = DMU_OT(DMU_BSWAP_UINT32, B_FALSE),
227 DMU_OTN_UINT32_METADATA = DMU_OT(DMU_BSWAP_UINT32, B_TRUE),
228 DMU_OTN_UINT64_DATA = DMU_OT(DMU_BSWAP_UINT64, B_FALSE),
229 DMU_OTN_UINT64_METADATA = DMU_OT(DMU_BSWAP_UINT64, B_TRUE),
230 DMU_OTN_ZAP_DATA = DMU_OT(DMU_BSWAP_ZAP, B_FALSE),
231 DMU_OTN_ZAP_METADATA = DMU_OT(DMU_BSWAP_ZAP, B_TRUE),
232 } dmu_object_type_t;
233
234 /*
235 * These flags are intended to be used to specify the "txg_how"
236 * parameter when calling the dmu_tx_assign() function. See the comment
237 * above dmu_tx_assign() for more details on the meaning of these flags.
238 */
239 #define TXG_NOWAIT (0ULL)
240 #define TXG_WAIT (1ULL<<0)
241 #define TXG_NOTHROTTLE (1ULL<<1)
242
243 void byteswap_uint64_array(void *buf, size_t size);
244 void byteswap_uint32_array(void *buf, size_t size);
245 void byteswap_uint16_array(void *buf, size_t size);
246 void byteswap_uint8_array(void *buf, size_t size);
247 void zap_byteswap(void *buf, size_t size);
248 void zfs_oldacl_byteswap(void *buf, size_t size);
249 void zfs_acl_byteswap(void *buf, size_t size);
250 void zfs_znode_byteswap(void *buf, size_t size);
251
252 #define DS_FIND_SNAPSHOTS (1<<0)
253 #define DS_FIND_CHILDREN (1<<1)
254 #define DS_FIND_SERIALIZE (1<<2)
255
256 /*
257 * The maximum number of bytes that can be accessed as part of one
258 * operation, including metadata.
259 */
260 #define DMU_MAX_ACCESS (32 * 1024 * 1024) /* 32MB */
261 #define DMU_MAX_DELETEBLKCNT (20480) /* ~5MB of indirect blocks */
262
274 int dmu_objset_hold(const char *name, void *tag, objset_t **osp);
275 int dmu_objset_own(const char *name, dmu_objset_type_t type,
276 boolean_t readonly, void *tag, objset_t **osp);
277 void dmu_objset_rele(objset_t *os, void *tag);
278 void dmu_objset_disown(objset_t *os, void *tag);
279 int dmu_objset_open_ds(struct dsl_dataset *ds, objset_t **osp);
280
281 void dmu_objset_evict_dbufs(objset_t *os);
282 int dmu_objset_create(const char *name, dmu_objset_type_t type, uint64_t flags,
283 void (*func)(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx), void *arg);
284 int dmu_objset_clone(const char *name, const char *origin);
285 int dsl_destroy_snapshots_nvl(struct nvlist *snaps, boolean_t defer,
286 struct nvlist *errlist);
287 int dmu_objset_snapshot_one(const char *fsname, const char *snapname);
288 int dmu_objset_snapshot_tmp(const char *, const char *, int);
289 int dmu_objset_find(char *name, int func(const char *, void *), void *arg,
290 int flags);
291 void dmu_objset_byteswap(void *buf, size_t size);
292 int dsl_dataset_rename_snapshot(const char *fsname,
293 const char *oldsnapname, const char *newsnapname, boolean_t recursive);
294 int dmu_objset_remap_indirects(const char *fsname);
295
296 typedef struct dmu_buf {
297 uint64_t db_object; /* object that this buffer is part of */
298 uint64_t db_offset; /* byte offset in this object */
299 uint64_t db_size; /* size of buffer in bytes */
300 void *db_data; /* data in buffer */
301 } dmu_buf_t;
302
303 /*
304 * The names of zap entries in the DIRECTORY_OBJECT of the MOS.
305 */
306 #define DMU_POOL_DIRECTORY_OBJECT 1
307 #define DMU_POOL_CONFIG "config"
308 #define DMU_POOL_FEATURES_FOR_WRITE "features_for_write"
309 #define DMU_POOL_FEATURES_FOR_READ "features_for_read"
310 #define DMU_POOL_FEATURE_DESCRIPTIONS "feature_descriptions"
311 #define DMU_POOL_FEATURE_ENABLED_TXG "feature_enabled_txg"
312 #define DMU_POOL_ROOT_DATASET "root_dataset"
313 #define DMU_POOL_SYNC_BPOBJ "sync_bplist"
314 #define DMU_POOL_ERRLOG_SCRUB "errlog_scrub"
315 #define DMU_POOL_ERRLOG_LAST "errlog_last"
316 #define DMU_POOL_SPARES "spares"
317 #define DMU_POOL_DEFLATE "deflate"
318 #define DMU_POOL_HISTORY "history"
319 #define DMU_POOL_PROPS "pool_props"
320 #define DMU_POOL_L2CACHE "l2cache"
321 #define DMU_POOL_TMP_USERREFS "tmp_userrefs"
322 #define DMU_POOL_DDT "DDT-%s-%s-%s"
323 #define DMU_POOL_DDT_STATS "DDT-statistics"
324 #define DMU_POOL_CREATION_VERSION "creation_version"
325 #define DMU_POOL_SCAN "scan"
326 #define DMU_POOL_FREE_BPOBJ "free_bpobj"
327 #define DMU_POOL_BPTREE_OBJ "bptree_obj"
328 #define DMU_POOL_EMPTY_BPOBJ "empty_bpobj"
329 #define DMU_POOL_CHECKSUM_SALT "org.illumos:checksum_salt"
330 #define DMU_POOL_VDEV_ZAP_MAP "com.delphix:vdev_zap_map"
331 #define DMU_POOL_REMOVING "com.delphix:removing"
332 #define DMU_POOL_OBSOLETE_BPOBJ "com.delphix:obsolete_bpobj"
333 #define DMU_POOL_CONDENSING_INDIRECT "com.delphix:condensing_indirect"
334
335 /*
336 * Allocate an object from this objset. The range of object numbers
337 * available is (0, DN_MAX_OBJECT). Object 0 is the meta-dnode.
338 *
339 * The transaction must be assigned to a txg. The newly allocated
340 * object will be "held" in the transaction (ie. you can modify the
341 * newly allocated object in this transaction).
342 *
343 * dmu_object_alloc() chooses an object and returns it in *objectp.
344 *
345 * dmu_object_claim() allocates a specific object number. If that
346 * number is already allocated, it fails and returns EEXIST.
347 *
348 * Return 0 on success, or ENOSPC or EEXIST as specified above.
349 */
350 uint64_t dmu_object_alloc(objset_t *os, dmu_object_type_t ot,
351 int blocksize, dmu_object_type_t bonus_type, int bonus_len, dmu_tx_t *tx);
352 int dmu_object_claim(objset_t *os, uint64_t object, dmu_object_type_t ot,
353 int blocksize, dmu_object_type_t bonus_type, int bonus_len, dmu_tx_t *tx);
354 int dmu_object_reclaim(objset_t *os, uint64_t object, dmu_object_type_t ot,
397 * Returns 0 on success, or EBUSY if there are any holds on the object
398 * contents, or ENOTSUP as described above.
399 */
400 int dmu_object_set_blocksize(objset_t *os, uint64_t object, uint64_t size,
401 int ibs, dmu_tx_t *tx);
402
403 /*
404 * Set the checksum property on a dnode. The new checksum algorithm will
405 * apply to all newly written blocks; existing blocks will not be affected.
406 */
407 void dmu_object_set_checksum(objset_t *os, uint64_t object, uint8_t checksum,
408 dmu_tx_t *tx);
409
410 /*
411 * Set the compress property on a dnode. The new compression algorithm will
412 * apply to all newly written blocks; existing blocks will not be affected.
413 */
414 void dmu_object_set_compress(objset_t *os, uint64_t object, uint8_t compress,
415 dmu_tx_t *tx);
416
417 int dmu_object_remap_indirects(objset_t *os, uint64_t object, uint64_t txg);
418
419 void
420 dmu_write_embedded(objset_t *os, uint64_t object, uint64_t offset,
421 void *data, uint8_t etype, uint8_t comp, int uncompressed_size,
422 int compressed_size, int byteorder, dmu_tx_t *tx);
423
424 /*
425 * Decide how to write a block: checksum, compression, number of copies, etc.
426 */
427 #define WP_NOFILL 0x1
428 #define WP_DMU_SYNC 0x2
429 #define WP_SPILL 0x4
430
431 void dmu_write_policy(objset_t *os, dnode_t *dn, int level, int wp,
432 struct zio_prop *zp);
433 /*
434 * The bonus data is accessed more or less like a regular buffer.
435 * You must dmu_bonus_hold() to get the buffer, which will give you a
436 * dmu_buf_t with db_offset==-1ULL, and db_size = the size of the bonus
437 * data. As with any normal buffer, you must call dmu_buf_will_dirty()
438 * before modifying it, and the
439 * object must be held in an assigned transaction before calling
440 * dmu_buf_will_dirty. You may use dmu_buf_set_user() on the bonus
441 * buffer as well. You must release your hold with dmu_buf_rele().
442 *
443 * Returns ENOENT, EIO, or 0.
444 */
445 int dmu_bonus_hold(objset_t *os, uint64_t object, void *tag, dmu_buf_t **);
446 int dmu_bonus_max(void);
447 int dmu_set_bonus(dmu_buf_t *, int, dmu_tx_t *);
448 int dmu_set_bonustype(dmu_buf_t *, dmu_object_type_t, dmu_tx_t *);
449 dmu_object_type_t dmu_get_bonustype(dmu_buf_t *);
450 int dmu_rm_spill(objset_t *, uint64_t, dmu_tx_t *);
451
452 /*
453 * Special spill buffer support used by "SA" framework
454 */
455
456 int dmu_spill_hold_by_bonus(dmu_buf_t *bonus, void *tag, dmu_buf_t **dbp);
457 int dmu_spill_hold_by_dnode(dnode_t *dn, uint32_t flags,
458 void *tag, dmu_buf_t **dbp);
635 objset_t *dmu_buf_get_objset(dmu_buf_t *db);
636 dnode_t *dmu_buf_dnode_enter(dmu_buf_t *db);
637 void dmu_buf_dnode_exit(dmu_buf_t *db);
638
639 /* Block until any in-progress dmu buf user evictions complete. */
640 void dmu_buf_user_evict_wait(void);
641
642 /*
643 * Returns the blkptr associated with this dbuf, or NULL if not set.
644 */
645 struct blkptr *dmu_buf_get_blkptr(dmu_buf_t *db);
646
647 /*
648 * Indicate that you are going to modify the buffer's data (db_data).
649 *
650 * The transaction (tx) must be assigned to a txg (ie. you've called
651 * dmu_tx_assign()). The buffer's object must be held in the tx
652 * (ie. you've called dmu_tx_hold_object(tx, db->db_object)).
653 */
654 void dmu_buf_will_dirty(dmu_buf_t *db, dmu_tx_t *tx);
655
656 /*
657 * You must create a transaction, then hold the objects which you will
658 * (or might) modify as part of this transaction. Then you must assign
659 * the transaction to a transaction group. Once the transaction has
660 * been assigned, you can modify buffers which belong to held objects as
661 * part of this transaction. You can't modify buffers before the
662 * transaction has been assigned; you can't modify buffers which don't
663 * belong to objects which this transaction holds; you can't hold
664 * objects once the transaction has been assigned. You may hold an
665 * object which you are going to free (with dmu_object_free()), but you
666 * don't have to.
667 *
668 * You can abort the transaction before it has been assigned.
669 *
670 * Note that you may hold buffers (with dmu_buf_hold) at any time,
671 * regardless of transaction state.
672 */
673
674 #define DMU_NEW_OBJECT (-1ULL)
675 #define DMU_OBJECT_END (-1ULL)
676
677 dmu_tx_t *dmu_tx_create(objset_t *os);
678 void dmu_tx_hold_write(dmu_tx_t *tx, uint64_t object, uint64_t off, int len);
679 void dmu_tx_hold_write_by_dnode(dmu_tx_t *tx, dnode_t *dn, uint64_t off,
680 int len);
681 void dmu_tx_hold_free(dmu_tx_t *tx, uint64_t object, uint64_t off,
682 uint64_t len);
683 void dmu_tx_hold_free_by_dnode(dmu_tx_t *tx, dnode_t *dn, uint64_t off,
684 uint64_t len);
685 void dmu_tx_hold_remap_l1indirect(dmu_tx_t *tx, uint64_t object);
686 void dmu_tx_hold_zap(dmu_tx_t *tx, uint64_t object, int add, const char *name);
687 void dmu_tx_hold_zap_by_dnode(dmu_tx_t *tx, dnode_t *dn, int add,
688 const char *name);
689 void dmu_tx_hold_bonus(dmu_tx_t *tx, uint64_t object);
690 void dmu_tx_hold_bonus_by_dnode(dmu_tx_t *tx, dnode_t *dn);
691 void dmu_tx_hold_spill(dmu_tx_t *tx, uint64_t object);
692 void dmu_tx_hold_sa(dmu_tx_t *tx, struct sa_handle *hdl, boolean_t may_grow);
693 void dmu_tx_hold_sa_create(dmu_tx_t *tx, int total_size);
694 void dmu_tx_abort(dmu_tx_t *tx);
695 int dmu_tx_assign(dmu_tx_t *tx, uint64_t txg_how);
696 void dmu_tx_wait(dmu_tx_t *tx);
697 void dmu_tx_commit(dmu_tx_t *tx);
698 void dmu_tx_mark_netfree(dmu_tx_t *tx);
699
700 /*
701 * To register a commit callback, dmu_tx_callback_register() must be called.
702 *
703 * dcb_data is a pointer to caller private data that is passed on as a
704 * callback parameter. The caller is responsible for properly allocating and
705 * freeing it.
706 *
707 * When registering a callback, the transaction must be already created, but
708 * it cannot be committed or aborted. It can be assigned to a txg or not.
709 *
710 * The callback will be called after the transaction has been safely written
711 * to stable storage and will also be called if the dmu_tx is aborted.
712 * If there is any error which prevents the transaction from being committed to
713 * disk, the callback will be called with a value of error != 0.
714 */
715 typedef void dmu_tx_callback_func_t(void *dcb_data, int error);
781 uint32_t doi_data_block_size;
782 uint32_t doi_metadata_block_size;
783 dmu_object_type_t doi_type;
784 dmu_object_type_t doi_bonus_type;
785 uint64_t doi_bonus_size;
786 uint8_t doi_indirection; /* 2 = dnode->indirect->data */
787 uint8_t doi_checksum;
788 uint8_t doi_compress;
789 uint8_t doi_nblkptr;
790 uint8_t doi_pad[4];
791 uint64_t doi_physical_blocks_512; /* data + metadata, 512b blks */
792 uint64_t doi_max_offset;
793 uint64_t doi_fill_count; /* number of non-empty blocks */
794 } dmu_object_info_t;
795
796 typedef void arc_byteswap_func_t(void *buf, size_t size);
797
798 typedef struct dmu_object_type_info {
799 dmu_object_byteswap_t ot_byteswap;
800 boolean_t ot_metadata;
801 char *ot_name;
802 } dmu_object_type_info_t;
803
804 typedef struct dmu_object_byteswap_info {
805 arc_byteswap_func_t *ob_func;
806 char *ob_name;
807 } dmu_object_byteswap_info_t;
808
809 extern const dmu_object_type_info_t dmu_ot[DMU_OT_NUMTYPES];
810 extern const dmu_object_byteswap_info_t dmu_ot_byteswap[DMU_BSWAP_NUMFUNCS];
811
812 /*
813 * Get information on a DMU object.
814 *
815 * Return 0 on success or ENOENT if object is not allocated.
816 *
817 * If doi is NULL, just indicates whether the object exists.
818 */
819 int dmu_object_info(objset_t *os, uint64_t object, dmu_object_info_t *doi);
820 /* Like dmu_object_info, but faster if you have a held dnode in hand. */
821 void dmu_object_info_from_dnode(dnode_t *dn, dmu_object_info_t *doi);
822 /* Like dmu_object_info, but faster if you have a held dbuf in hand. */
823 void dmu_object_info_from_db(dmu_buf_t *db, dmu_object_info_t *doi);
824 /*
825 * Like dmu_object_info_from_db, but faster still when you only care about
826 * the size. This is specifically optimized for zfs_getattr().
827 */
828 void dmu_object_size_from_db(dmu_buf_t *db, uint32_t *blksize,
829 u_longlong_t *nblk512);
830
831 typedef struct dmu_objset_stats {
832 uint64_t dds_num_clones; /* number of clones of this */
833 uint64_t dds_creation_txg;
834 uint64_t dds_guid;
835 dmu_objset_type_t dds_type;
836 uint8_t dds_is_snapshot;
837 uint8_t dds_inconsistent;
838 char dds_origin[ZFS_MAX_DATASET_NAME_LEN];
839 } dmu_objset_stats_t;
840
841 /*
842 * Get stats on a dataset.
843 */
844 void dmu_objset_fast_stat(objset_t *os, dmu_objset_stats_t *stat);
845
846 /*
847 * Add entries to the nvlist for all the objset's properties. See
848 * zfs_prop_table[] and zfs(1m) for details on the properties.
849 */
850 void dmu_objset_stats(objset_t *os, struct nvlist *nv);
851
852 /*
853 * Get the space usage statistics for statvfs().
854 *
855 * refdbytes is the amount of space "referenced" by this objset.
856 * availbytes is the amount of space available to this objset, taking
870 * change, so there is a small probability that it will collide.)
871 */
872 uint64_t dmu_objset_fsid_guid(objset_t *os);
873
874 /*
875 * Get the [cm]time for an objset's snapshot dir
876 */
877 timestruc_t dmu_objset_snap_cmtime(objset_t *os);
878
879 int dmu_objset_is_snapshot(objset_t *os);
880
881 extern struct spa *dmu_objset_spa(objset_t *os);
882 extern struct zilog *dmu_objset_zil(objset_t *os);
883 extern struct dsl_pool *dmu_objset_pool(objset_t *os);
884 extern struct dsl_dataset *dmu_objset_ds(objset_t *os);
885 extern void dmu_objset_name(objset_t *os, char *buf);
886 extern dmu_objset_type_t dmu_objset_type(objset_t *os);
887 extern uint64_t dmu_objset_id(objset_t *os);
888 extern zfs_sync_type_t dmu_objset_syncprop(objset_t *os);
889 extern zfs_logbias_op_t dmu_objset_logbias(objset_t *os);
890 extern int dmu_snapshot_list_next(objset_t *os, int namelen, char *name,
891 uint64_t *id, uint64_t *offp, boolean_t *case_conflict);
892 extern int dmu_snapshot_realname(objset_t *os, char *name, char *real,
893 int maxlen, boolean_t *conflict);
894 extern int dmu_dir_list_next(objset_t *os, int namelen, char *name,
895 uint64_t *idp, uint64_t *offp);
896
897 typedef int objset_used_cb_t(dmu_object_type_t bonustype,
898 void *bonus, uint64_t *userp, uint64_t *groupp);
899 extern void dmu_objset_register_type(dmu_objset_type_t ost,
900 objset_used_cb_t *cb);
901 extern void dmu_objset_set_user(objset_t *os, void *user_ptr);
902 extern void *dmu_objset_get_user(objset_t *os);
903
904 /*
905 * Return the txg number for the given assigned transaction.
906 */
907 uint64_t dmu_tx_get_txg(dmu_tx_t *tx);
908
909 /*
|
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 /*
23 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Copyright (c) 2011, 2017 by Delphix. All rights reserved.
25 * Copyright 2016 Nexenta Systems, Inc. All rights reserved.
26 * Copyright (c) 2012, Joyent, Inc. All rights reserved.
27 * Copyright 2013 DEY Storage Systems, Inc.
28 * Copyright 2014 HybridCluster. All rights reserved.
29 * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
30 * Copyright 2013 Saso Kiselkov. All rights reserved.
31 * Copyright (c) 2014 Integros [integros.com]
32 */
33
34 /* Portions Copyright 2010 Robert Milkowski */
35
36 #ifndef _SYS_DMU_H
37 #define _SYS_DMU_H
38
39 /*
40 * This file describes the interface that the DMU provides for its
41 * consumers.
42 *
43 * The DMU also interacts with the SPA. That interface is described in
44 * dmu_spa.h.
45 */
92 DMU_BSWAP_ZNODE,
93 DMU_BSWAP_OLDACL,
94 DMU_BSWAP_ACL,
95 /*
96 * Allocating a new byteswap type number makes the on-disk format
97 * incompatible with any other format that uses the same number.
98 *
99 * Data can usually be structured to work with one of the
100 * DMU_BSWAP_UINT* or DMU_BSWAP_ZAP types.
101 */
102 DMU_BSWAP_NUMFUNCS
103 } dmu_object_byteswap_t;
104
105 #define DMU_OT_NEWTYPE 0x80
106 #define DMU_OT_METADATA 0x40
107 #define DMU_OT_BYTESWAP_MASK 0x3f
108
109 /*
110 * Defines a uint8_t object type. Object types specify if the data
111 * in the object is metadata (boolean) and how to byteswap the data
112 * (dmu_object_byteswap_t). All of the types created by this method
113 * are cached in the dbuf metadata cache.
114 */
115 #define DMU_OT(byteswap, metadata) \
116 (DMU_OT_NEWTYPE | \
117 ((metadata) ? DMU_OT_METADATA : 0) | \
118 ((byteswap) & DMU_OT_BYTESWAP_MASK))
119
120 #define DMU_OT_IS_VALID(ot) (((ot) & DMU_OT_NEWTYPE) ? \
121 ((ot) & DMU_OT_BYTESWAP_MASK) < DMU_BSWAP_NUMFUNCS : \
122 (ot) < DMU_OT_NUMTYPES)
123
124 #define DMU_OT_IS_METADATA(ot) (((ot) & DMU_OT_NEWTYPE) ? \
125 ((ot) & DMU_OT_METADATA) : \
126 dmu_ot[(ot)].ot_metadata)
127
128 #define DMU_OT_IS_METADATA_CACHED(ot) (((ot) & DMU_OT_NEWTYPE) ? \
129 B_TRUE : dmu_ot[(ot)].ot_dbuf_metadata_cache)
130
131 /*
132 * These object types use bp_fill != 1 for their L0 bp's. Therefore they can't
133 * have their data embedded (i.e. use a BP_IS_EMBEDDED() bp), because bp_fill
134 * is repurposed for embedded BPs.
135 */
136 #define DMU_OT_HAS_FILL(ot) \
137 ((ot) == DMU_OT_DNODE || (ot) == DMU_OT_OBJSET)
138
139 #define DMU_OT_BYTESWAP(ot) (((ot) & DMU_OT_NEWTYPE) ? \
140 ((ot) & DMU_OT_BYTESWAP_MASK) : \
141 dmu_ot[(ot)].ot_byteswap)
142
143 typedef enum dmu_object_type {
144 DMU_OT_NONE,
145 /* general: */
146 DMU_OT_OBJECT_DIRECTORY, /* ZAP */
147 DMU_OT_OBJECT_ARRAY, /* UINT64 */
148 DMU_OT_PACKED_NVLIST, /* UINT8 (XDR by nvlist_pack/unpack) */
149 DMU_OT_PACKED_NVLIST_SIZE, /* UINT64 */
150 DMU_OT_BPOBJ, /* UINT64 */
218 * of indexing into dmu_ot directly (this works for both DMU_OT_* types
219 * and DMU_OTN_* types).
220 */
221 DMU_OT_NUMTYPES,
222
223 /*
224 * Names for valid types declared with DMU_OT().
225 */
226 DMU_OTN_UINT8_DATA = DMU_OT(DMU_BSWAP_UINT8, B_FALSE),
227 DMU_OTN_UINT8_METADATA = DMU_OT(DMU_BSWAP_UINT8, B_TRUE),
228 DMU_OTN_UINT16_DATA = DMU_OT(DMU_BSWAP_UINT16, B_FALSE),
229 DMU_OTN_UINT16_METADATA = DMU_OT(DMU_BSWAP_UINT16, B_TRUE),
230 DMU_OTN_UINT32_DATA = DMU_OT(DMU_BSWAP_UINT32, B_FALSE),
231 DMU_OTN_UINT32_METADATA = DMU_OT(DMU_BSWAP_UINT32, B_TRUE),
232 DMU_OTN_UINT64_DATA = DMU_OT(DMU_BSWAP_UINT64, B_FALSE),
233 DMU_OTN_UINT64_METADATA = DMU_OT(DMU_BSWAP_UINT64, B_TRUE),
234 DMU_OTN_ZAP_DATA = DMU_OT(DMU_BSWAP_ZAP, B_FALSE),
235 DMU_OTN_ZAP_METADATA = DMU_OT(DMU_BSWAP_ZAP, B_TRUE),
236 } dmu_object_type_t;
237
238 typedef enum txg_how {
239 TXG_WAIT = 1,
240 TXG_NOWAIT,
241 TXG_WAITED,
242 } txg_how_t;
243
244 /*
245 * Selected classes of metadata
246 */
247 #define DMU_OT_IS_DDT_META(type) \
248 ((type == DMU_OT_DDT_ZAP) || \
249 (type == DMU_OT_DDT_STATS))
250
251 #define DMU_OT_IS_ZPL_META(type) \
252 ((type == DMU_OT_ZNODE) || \
253 (type == DMU_OT_OLDACL) || \
254 (type == DMU_OT_DIRECTORY_CONTENTS) || \
255 (type == DMU_OT_MASTER_NODE) || \
256 (type == DMU_OT_UNLINKED_SET))
257
258 void byteswap_uint64_array(void *buf, size_t size);
259 void byteswap_uint32_array(void *buf, size_t size);
260 void byteswap_uint16_array(void *buf, size_t size);
261 void byteswap_uint8_array(void *buf, size_t size);
262 void zap_byteswap(void *buf, size_t size);
263 void zfs_oldacl_byteswap(void *buf, size_t size);
264 void zfs_acl_byteswap(void *buf, size_t size);
265 void zfs_znode_byteswap(void *buf, size_t size);
266
267 #define DS_FIND_SNAPSHOTS (1<<0)
268 #define DS_FIND_CHILDREN (1<<1)
269 #define DS_FIND_SERIALIZE (1<<2)
270
271 /*
272 * The maximum number of bytes that can be accessed as part of one
273 * operation, including metadata.
274 */
275 #define DMU_MAX_ACCESS (32 * 1024 * 1024) /* 32MB */
276 #define DMU_MAX_DELETEBLKCNT (20480) /* ~5MB of indirect blocks */
277
289 int dmu_objset_hold(const char *name, void *tag, objset_t **osp);
290 int dmu_objset_own(const char *name, dmu_objset_type_t type,
291 boolean_t readonly, void *tag, objset_t **osp);
292 void dmu_objset_rele(objset_t *os, void *tag);
293 void dmu_objset_disown(objset_t *os, void *tag);
294 int dmu_objset_open_ds(struct dsl_dataset *ds, objset_t **osp);
295
296 void dmu_objset_evict_dbufs(objset_t *os);
297 int dmu_objset_create(const char *name, dmu_objset_type_t type, uint64_t flags,
298 void (*func)(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx), void *arg);
299 int dmu_objset_clone(const char *name, const char *origin);
300 int dsl_destroy_snapshots_nvl(struct nvlist *snaps, boolean_t defer,
301 struct nvlist *errlist);
302 int dmu_objset_snapshot_one(const char *fsname, const char *snapname);
303 int dmu_objset_snapshot_tmp(const char *, const char *, int);
304 int dmu_objset_find(char *name, int func(const char *, void *), void *arg,
305 int flags);
306 void dmu_objset_byteswap(void *buf, size_t size);
307 int dsl_dataset_rename_snapshot(const char *fsname,
308 const char *oldsnapname, const char *newsnapname, boolean_t recursive);
309
310 typedef struct dmu_buf {
311 uint64_t db_object; /* object that this buffer is part of */
312 uint64_t db_offset; /* byte offset in this object */
313 uint64_t db_size; /* size of buffer in bytes */
314 void *db_data; /* data in buffer */
315 } dmu_buf_t;
316
317 /*
318 * The names of zap entries in the DIRECTORY_OBJECT of the MOS.
319 */
320 #define DMU_POOL_DIRECTORY_OBJECT 1
321 #define DMU_POOL_CONFIG "config"
322 #define DMU_POOL_FEATURES_FOR_WRITE "features_for_write"
323 #define DMU_POOL_FEATURES_FOR_READ "features_for_read"
324 #define DMU_POOL_FEATURE_DESCRIPTIONS "feature_descriptions"
325 #define DMU_POOL_FEATURE_ENABLED_TXG "feature_enabled_txg"
326 #define DMU_POOL_ROOT_DATASET "root_dataset"
327 #define DMU_POOL_SYNC_BPOBJ "sync_bplist"
328 #define DMU_POOL_ERRLOG_SCRUB "errlog_scrub"
329 #define DMU_POOL_ERRLOG_LAST "errlog_last"
330 #define DMU_POOL_SPARES "spares"
331 #define DMU_POOL_DEFLATE "deflate"
332 #define DMU_POOL_HISTORY "history"
333 #define DMU_POOL_PROPS "pool_props"
334 #define DMU_POOL_L2CACHE "l2cache"
335 #define DMU_POOL_TMP_USERREFS "tmp_userrefs"
336 #define DMU_POOL_DDT "DDT-%s-%s-%s"
337 #define DMU_POOL_DDT_STATS "DDT-statistics"
338 #define DMU_POOL_CREATION_VERSION "creation_version"
339 #define DMU_POOL_SCAN "scan"
340 #define DMU_POOL_FREE_BPOBJ "free_bpobj"
341 #define DMU_POOL_BPTREE_OBJ "bptree_obj"
342 #define DMU_POOL_EMPTY_BPOBJ "empty_bpobj"
343 #define DMU_POOL_CHECKSUM_SALT "org.illumos:checksum_salt"
344 #define DMU_POOL_VDEV_ZAP_MAP "com.delphix:vdev_zap_map"
345
346 #define DMU_POOL_COS_PROPS "cos_props"
347 #define DMU_POOL_VDEV_PROPS "vdev_props"
348 #define DMU_POOL_TRIM_START_TIME "trim_start_time"
349 #define DMU_POOL_TRIM_STOP_TIME "trim_stop_time"
350
351 /*
352 * Allocate an object from this objset. The range of object numbers
353 * available is (0, DN_MAX_OBJECT). Object 0 is the meta-dnode.
354 *
355 * The transaction must be assigned to a txg. The newly allocated
356 * object will be "held" in the transaction (ie. you can modify the
357 * newly allocated object in this transaction).
358 *
359 * dmu_object_alloc() chooses an object and returns it in *objectp.
360 *
361 * dmu_object_claim() allocates a specific object number. If that
362 * number is already allocated, it fails and returns EEXIST.
363 *
364 * Return 0 on success, or ENOSPC or EEXIST as specified above.
365 */
366 uint64_t dmu_object_alloc(objset_t *os, dmu_object_type_t ot,
367 int blocksize, dmu_object_type_t bonus_type, int bonus_len, dmu_tx_t *tx);
368 int dmu_object_claim(objset_t *os, uint64_t object, dmu_object_type_t ot,
369 int blocksize, dmu_object_type_t bonus_type, int bonus_len, dmu_tx_t *tx);
370 int dmu_object_reclaim(objset_t *os, uint64_t object, dmu_object_type_t ot,
413 * Returns 0 on success, or EBUSY if there are any holds on the object
414 * contents, or ENOTSUP as described above.
415 */
416 int dmu_object_set_blocksize(objset_t *os, uint64_t object, uint64_t size,
417 int ibs, dmu_tx_t *tx);
418
419 /*
420 * Set the checksum property on a dnode. The new checksum algorithm will
421 * apply to all newly written blocks; existing blocks will not be affected.
422 */
423 void dmu_object_set_checksum(objset_t *os, uint64_t object, uint8_t checksum,
424 dmu_tx_t *tx);
425
426 /*
427 * Set the compress property on a dnode. The new compression algorithm will
428 * apply to all newly written blocks; existing blocks will not be affected.
429 */
430 void dmu_object_set_compress(objset_t *os, uint64_t object, uint8_t compress,
431 dmu_tx_t *tx);
432
433 void
434 dmu_write_embedded(objset_t *os, uint64_t object, uint64_t offset,
435 void *data, uint8_t etype, uint8_t comp, int uncompressed_size,
436 int compressed_size, int byteorder, dmu_tx_t *tx);
437
438 /*
439 * Decide how to write a block: checksum, compression, number of copies, etc.
440 */
441 #define WP_NOFILL 0x1
442 #define WP_DMU_SYNC 0x2
443 #define WP_SPILL 0x4
444
445 #define WP_SPECIALCLASS_SHIFT (16)
446 #define WP_SPECIALCLASS_BITS (1) /* 1 bits per storage class */
447 #define WP_SPECIALCLASS_MASK (((1 << WP_SPECIALCLASS_BITS) - 1) \
448 << WP_SPECIALCLASS_SHIFT)
449
450 #define WP_SET_SPECIALCLASS(flags, sclass) { \
451 flags |= ((sclass << WP_SPECIALCLASS_SHIFT) & WP_SPECIALCLASS_MASK); \
452 }
453
454 #define WP_GET_SPECIALCLASS(flags) \
455 ((flags & WP_SPECIALCLASS_MASK) >> WP_SPECIALCLASS_SHIFT)
456
457 void dmu_write_policy(objset_t *os, dnode_t *dn, int level, int wp,
458 struct zio_prop *zp);
459 /*
460 * The bonus data is accessed more or less like a regular buffer.
461 * You must dmu_bonus_hold() to get the buffer, which will give you a
462 * dmu_buf_t with db_offset==-1ULL, and db_size = the size of the bonus
463 * data. As with any normal buffer, you must call dmu_buf_read() to
464 * read db_data, dmu_buf_will_dirty() before modifying it, and the
465 * object must be held in an assigned transaction before calling
466 * dmu_buf_will_dirty. You may use dmu_buf_set_user() on the bonus
467 * buffer as well. You must release your hold with dmu_buf_rele().
468 *
469 * Returns ENOENT, EIO, or 0.
470 */
471 int dmu_bonus_hold(objset_t *os, uint64_t object, void *tag, dmu_buf_t **);
472 int dmu_bonus_max(void);
473 int dmu_set_bonus(dmu_buf_t *, int, dmu_tx_t *);
474 int dmu_set_bonustype(dmu_buf_t *, dmu_object_type_t, dmu_tx_t *);
475 dmu_object_type_t dmu_get_bonustype(dmu_buf_t *);
476 int dmu_rm_spill(objset_t *, uint64_t, dmu_tx_t *);
477
478 /*
479 * Special spill buffer support used by "SA" framework
480 */
481
482 int dmu_spill_hold_by_bonus(dmu_buf_t *bonus, void *tag, dmu_buf_t **dbp);
483 int dmu_spill_hold_by_dnode(dnode_t *dn, uint32_t flags,
484 void *tag, dmu_buf_t **dbp);
661 objset_t *dmu_buf_get_objset(dmu_buf_t *db);
662 dnode_t *dmu_buf_dnode_enter(dmu_buf_t *db);
663 void dmu_buf_dnode_exit(dmu_buf_t *db);
664
665 /* Block until any in-progress dmu buf user evictions complete. */
666 void dmu_buf_user_evict_wait(void);
667
668 /*
669 * Returns the blkptr associated with this dbuf, or NULL if not set.
670 */
671 struct blkptr *dmu_buf_get_blkptr(dmu_buf_t *db);
672
673 /*
674 * Indicate that you are going to modify the buffer's data (db_data).
675 *
676 * The transaction (tx) must be assigned to a txg (ie. you've called
677 * dmu_tx_assign()). The buffer's object must be held in the tx
678 * (ie. you've called dmu_tx_hold_object(tx, db->db_object)).
679 */
680 void dmu_buf_will_dirty(dmu_buf_t *db, dmu_tx_t *tx);
681 void dmu_buf_will_dirty_sc(dmu_buf_t *db, dmu_tx_t *tx, boolean_t sc);
682
683 /*
684 * You must create a transaction, then hold the objects which you will
685 * (or might) modify as part of this transaction. Then you must assign
686 * the transaction to a transaction group. Once the transaction has
687 * been assigned, you can modify buffers which belong to held objects as
688 * part of this transaction. You can't modify buffers before the
689 * transaction has been assigned; you can't modify buffers which don't
690 * belong to objects which this transaction holds; you can't hold
691 * objects once the transaction has been assigned. You may hold an
692 * object which you are going to free (with dmu_object_free()), but you
693 * don't have to.
694 *
695 * You can abort the transaction before it has been assigned.
696 *
697 * Note that you may hold buffers (with dmu_buf_hold) at any time,
698 * regardless of transaction state.
699 */
700
701 #define DMU_NEW_OBJECT (-1ULL)
702 #define DMU_OBJECT_END (-1ULL)
703
704 dmu_tx_t *dmu_tx_create(objset_t *os);
705 void dmu_tx_hold_write(dmu_tx_t *tx, uint64_t object, uint64_t off, int len);
706 void dmu_tx_hold_write_by_dnode(dmu_tx_t *tx, dnode_t *dn, uint64_t off,
707 int len);
708 void dmu_tx_hold_free(dmu_tx_t *tx, uint64_t object, uint64_t off,
709 uint64_t len);
710 void dmu_tx_hold_free_by_dnode(dmu_tx_t *tx, dnode_t *dn, uint64_t off,
711 uint64_t len);
712 void dmu_tx_hold_zap(dmu_tx_t *tx, uint64_t object, int add, const char *name);
713 void dmu_tx_hold_zap_by_dnode(dmu_tx_t *tx, dnode_t *dn, int add,
714 const char *name);
715 void dmu_tx_hold_bonus(dmu_tx_t *tx, uint64_t object);
716 void dmu_tx_hold_bonus_by_dnode(dmu_tx_t *tx, dnode_t *dn);
717 void dmu_tx_hold_spill(dmu_tx_t *tx, uint64_t object);
718 void dmu_tx_hold_sa(dmu_tx_t *tx, struct sa_handle *hdl, boolean_t may_grow);
719 void dmu_tx_hold_sa_create(dmu_tx_t *tx, int total_size);
720 void dmu_tx_abort(dmu_tx_t *tx);
721 int dmu_tx_assign(dmu_tx_t *tx, enum txg_how txg_how);
722 void dmu_tx_wait(dmu_tx_t *tx);
723 void dmu_tx_commit(dmu_tx_t *tx);
724 void dmu_tx_mark_netfree(dmu_tx_t *tx);
725
726 /*
727 * To register a commit callback, dmu_tx_callback_register() must be called.
728 *
729 * dcb_data is a pointer to caller private data that is passed on as a
730 * callback parameter. The caller is responsible for properly allocating and
731 * freeing it.
732 *
733 * When registering a callback, the transaction must be already created, but
734 * it cannot be committed or aborted. It can be assigned to a txg or not.
735 *
736 * The callback will be called after the transaction has been safely written
737 * to stable storage and will also be called if the dmu_tx is aborted.
738 * If there is any error which prevents the transaction from being committed to
739 * disk, the callback will be called with a value of error != 0.
740 */
741 typedef void dmu_tx_callback_func_t(void *dcb_data, int error);
807 uint32_t doi_data_block_size;
808 uint32_t doi_metadata_block_size;
809 dmu_object_type_t doi_type;
810 dmu_object_type_t doi_bonus_type;
811 uint64_t doi_bonus_size;
812 uint8_t doi_indirection; /* 2 = dnode->indirect->data */
813 uint8_t doi_checksum;
814 uint8_t doi_compress;
815 uint8_t doi_nblkptr;
816 uint8_t doi_pad[4];
817 uint64_t doi_physical_blocks_512; /* data + metadata, 512b blks */
818 uint64_t doi_max_offset;
819 uint64_t doi_fill_count; /* number of non-empty blocks */
820 } dmu_object_info_t;
821
822 typedef void arc_byteswap_func_t(void *buf, size_t size);
823
824 typedef struct dmu_object_type_info {
825 dmu_object_byteswap_t ot_byteswap;
826 boolean_t ot_metadata;
827 boolean_t ot_dbuf_metadata_cache;
828 char *ot_name;
829 } dmu_object_type_info_t;
830
831 typedef struct dmu_object_byteswap_info {
832 arc_byteswap_func_t *ob_func;
833 char *ob_name;
834 } dmu_object_byteswap_info_t;
835
836 extern const dmu_object_type_info_t dmu_ot[DMU_OT_NUMTYPES];
837 extern const dmu_object_byteswap_info_t dmu_ot_byteswap[DMU_BSWAP_NUMFUNCS];
838
839 /*
840 * Get information on a DMU object.
841 *
842 * Return 0 on success or ENOENT if object is not allocated.
843 *
844 * If doi is NULL, just indicates whether the object exists.
845 */
846 int dmu_object_info(objset_t *os, uint64_t object, dmu_object_info_t *doi);
847 /* Like dmu_object_info, but faster if you have a held dnode in hand. */
848 void dmu_object_info_from_dnode(dnode_t *dn, dmu_object_info_t *doi);
849 /* Like dmu_object_info, but faster if you have a held dbuf in hand. */
850 void dmu_object_info_from_db(dmu_buf_t *db, dmu_object_info_t *doi);
851 /*
852 * Like dmu_object_info_from_db, but faster still when you only care about
853 * the size. This is specifically optimized for zfs_getattr().
854 */
855 void dmu_object_size_from_db(dmu_buf_t *db, uint32_t *blksize,
856 u_longlong_t *nblk512);
857
858 typedef struct dmu_objset_stats {
859 uint64_t dds_num_clones; /* number of clones of this */
860 uint64_t dds_creation_txg;
861 uint64_t dds_guid;
862 dmu_objset_type_t dds_type;
863 uint8_t dds_is_snapshot;
864 uint8_t dds_is_autosnapshot;
865 uint8_t dds_inconsistent;
866 char dds_origin[ZFS_MAX_DATASET_NAME_LEN];
867 } dmu_objset_stats_t;
868
869 /*
870 * Get stats on a dataset.
871 */
872 void dmu_objset_fast_stat(objset_t *os, dmu_objset_stats_t *stat);
873
874 /*
875 * Add entries to the nvlist for all the objset's properties. See
876 * zfs_prop_table[] and zfs(1m) for details on the properties.
877 */
878 void dmu_objset_stats(objset_t *os, struct nvlist *nv);
879
880 /*
881 * Get the space usage statistics for statvfs().
882 *
883 * refdbytes is the amount of space "referenced" by this objset.
884 * availbytes is the amount of space available to this objset, taking
898 * change, so there is a small probability that it will collide.)
899 */
900 uint64_t dmu_objset_fsid_guid(objset_t *os);
901
902 /*
903 * Get the [cm]time for an objset's snapshot dir
904 */
905 timestruc_t dmu_objset_snap_cmtime(objset_t *os);
906
907 int dmu_objset_is_snapshot(objset_t *os);
908
909 extern struct spa *dmu_objset_spa(objset_t *os);
910 extern struct zilog *dmu_objset_zil(objset_t *os);
911 extern struct dsl_pool *dmu_objset_pool(objset_t *os);
912 extern struct dsl_dataset *dmu_objset_ds(objset_t *os);
913 extern void dmu_objset_name(objset_t *os, char *buf);
914 extern dmu_objset_type_t dmu_objset_type(objset_t *os);
915 extern uint64_t dmu_objset_id(objset_t *os);
916 extern zfs_sync_type_t dmu_objset_syncprop(objset_t *os);
917 extern zfs_logbias_op_t dmu_objset_logbias(objset_t *os);
918 int dmu_clone_list_next(objset_t *os, int len, char *name,
919 uint64_t *idp, uint64_t *offp);
920 extern int dmu_snapshot_list_next(objset_t *os, int namelen, char *name,
921 uint64_t *id, uint64_t *offp, boolean_t *case_conflict);
922 extern int dmu_snapshot_realname(objset_t *os, char *name, char *real,
923 int maxlen, boolean_t *conflict);
924 extern int dmu_dir_list_next(objset_t *os, int namelen, char *name,
925 uint64_t *idp, uint64_t *offp);
926
927 typedef int objset_used_cb_t(dmu_object_type_t bonustype,
928 void *bonus, uint64_t *userp, uint64_t *groupp);
929 extern void dmu_objset_register_type(dmu_objset_type_t ost,
930 objset_used_cb_t *cb);
931 extern void dmu_objset_set_user(objset_t *os, void *user_ptr);
932 extern void *dmu_objset_get_user(objset_t *os);
933
934 /*
935 * Return the txg number for the given assigned transaction.
936 */
937 uint64_t dmu_tx_get_txg(dmu_tx_t *tx);
938
939 /*
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