include/sys/dsl_dataset.h

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
  23  * Copyright (c) 2011, 2018 by Delphix. All rights reserved.
  24  * Copyright (c) 2013 Steven Hartland. All rights reserved.
  25  * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
  26  */
  27
  28 #ifndef _SYS_DSL_DATASET_H
  29 #define _SYS_DSL_DATASET_H
  30
  31 #include <sys/dmu.h>
  32 #include <sys/spa.h>
  33 #include <sys/txg.h>
  34 #include <sys/zio.h>
  35 #include <sys/bplist.h>
  36 #include <sys/dsl_synctask.h>
  37 #include <sys/zfs_context.h>
  38 #include <sys/dsl_deadlist.h>
  39 #include <sys/refcount.h>
  40 #include <sys/rrwlock.h>
  41 #include <sys/dsl_crypt.h>
  42 #include <zfeature_common.h>
  43
  44 #ifdef  __cplusplus
  45 extern "C" {
  46 #endif
  47
  48 struct dsl_dataset;
  49 struct dsl_dir;
  50 struct dsl_pool;
  51 struct dsl_crypto_params;
  52 struct dsl_key_mapping;
  53
  54 #define DS_FLAG_INCONSISTENT    (1ULL<<0)
  55 #define DS_IS_INCONSISTENT(ds)  \
  56         (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_INCONSISTENT)
  57
  58 /*
  59  * Do not allow this dataset to be promoted.
  60  */
  61 #define DS_FLAG_NOPROMOTE       (1ULL<<1)
  62
  63 /*
  64  * DS_FLAG_UNIQUE_ACCURATE is set if ds_unique_bytes has been correctly
  65  * calculated for head datasets (starting with SPA_VERSION_UNIQUE_ACCURATE,
  66  * refquota/refreservations).
  67  */
  68 #define DS_FLAG_UNIQUE_ACCURATE (1ULL<<2)
  69
  70 /*
  71  * DS_FLAG_DEFER_DESTROY is set after 'zfs destroy -d' has been called
  72  * on a dataset. This allows the dataset to be destroyed using 'zfs release'.
  73  */
  74 #define DS_FLAG_DEFER_DESTROY   (1ULL<<3)
  75 #define DS_IS_DEFER_DESTROY(ds) \
  76         (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_DEFER_DESTROY)
  77
  78 /*
  79  * DS_FIELD_* are strings that are used in the "extensified" dataset zap object.
  80  * They should be of the format <reverse-dns>:<field>.
  81  */
  82
  83 /*
  84  * This field's value is the object ID of a zap object which contains the
  85  * bookmarks of this dataset.  If it is present, then this dataset is counted
  86  * in the refcount of the SPA_FEATURES_BOOKMARKS feature.
  87  */
  88 #define DS_FIELD_BOOKMARK_NAMES "com.delphix:bookmarks"
  89
  90 /*
  91  * This field is present (with value=0) if this dataset may contain large
  92  * dnodes (>512B).  If it is present, then this dataset is counted in the
  93  * refcount of the SPA_FEATURE_LARGE_DNODE feature.
  94  */
  95 #define DS_FIELD_LARGE_DNODE "org.zfsonlinux:large_dnode"
  96
  97 /*
  98  * These fields are set on datasets that are in the middle of a resumable
  99  * receive, and allow the sender to resume the send if it is interrupted.
 100  */
 101 #define DS_FIELD_RESUME_FROMGUID "com.delphix:resume_fromguid"
 102 #define DS_FIELD_RESUME_TONAME "com.delphix:resume_toname"
 103 #define DS_FIELD_RESUME_TOGUID "com.delphix:resume_toguid"
 104 #define DS_FIELD_RESUME_OBJECT "com.delphix:resume_object"
 105 #define DS_FIELD_RESUME_OFFSET "com.delphix:resume_offset"
 106 #define DS_FIELD_RESUME_BYTES "com.delphix:resume_bytes"
 107 #define DS_FIELD_RESUME_LARGEBLOCK "com.delphix:resume_largeblockok"
 108 #define DS_FIELD_RESUME_EMBEDOK "com.delphix:resume_embedok"
 109 #define DS_FIELD_RESUME_COMPRESSOK "com.delphix:resume_compressok"
 110 #define DS_FIELD_RESUME_RAWOK "com.datto:resume_rawok"
 111
 112 /*
 113  * This field is set to the object number of the remap deadlist if one exists.
 114  */
 115 #define DS_FIELD_REMAP_DEADLIST "com.delphix:remap_deadlist"
 116
 117 /*
 118  * This field is set to the ivset guid for encrypted snapshots. This is used
 119  * for validating raw receives.
 120  */
 121 #define DS_FIELD_IVSET_GUID     "com.datto:ivset_guid"
 122
 123 /*
 124  * DS_FLAG_CI_DATASET is set if the dataset contains a file system whose
 125  * name lookups should be performed case-insensitively.
 126  */
 127 #define DS_FLAG_CI_DATASET      (1ULL<<16)
 128
 129 #define DS_CREATE_FLAG_NODIRTY  (1ULL<<24)
 130
 131 typedef struct dsl_dataset_phys {
 132         uint64_t ds_dir_obj;            /* DMU_OT_DSL_DIR */
 133         uint64_t ds_prev_snap_obj;      /* DMU_OT_DSL_DATASET */
 134         uint64_t ds_prev_snap_txg;
 135         uint64_t ds_next_snap_obj;      /* DMU_OT_DSL_DATASET */
 136         uint64_t ds_snapnames_zapobj;   /* DMU_OT_DSL_DS_SNAP_MAP 0 for snaps */
 137         uint64_t ds_num_children;       /* clone/snap children; ==0 for head */
 138         uint64_t ds_creation_time;      /* seconds since 1970 */
 139         uint64_t ds_creation_txg;
 140         uint64_t ds_deadlist_obj;       /* DMU_OT_DEADLIST */
 141         /*
 142          * ds_referenced_bytes, ds_compressed_bytes, and ds_uncompressed_bytes
 143          * include all blocks referenced by this dataset, including those
 144          * shared with any other datasets.
 145          */
 146         uint64_t ds_referenced_bytes;
 147         uint64_t ds_compressed_bytes;
 148         uint64_t ds_uncompressed_bytes;
 149         uint64_t ds_unique_bytes;       /* only relevant to snapshots */
 150         /*
 151          * The ds_fsid_guid is a 56-bit ID that can change to avoid
 152          * collisions.  The ds_guid is a 64-bit ID that will never
 153          * change, so there is a small probability that it will collide.
 154          */
 155         uint64_t ds_fsid_guid;
 156         uint64_t ds_guid;
 157         uint64_t ds_flags;              /* DS_FLAG_* */
 158         blkptr_t ds_bp;
 159         uint64_t ds_next_clones_obj;    /* DMU_OT_DSL_CLONES */
 160         uint64_t ds_props_obj;          /* DMU_OT_DSL_PROPS for snaps */
 161         uint64_t ds_userrefs_obj;       /* DMU_OT_USERREFS */
 162         uint64_t ds_pad[5]; /* pad out to 320 bytes for good measure */
 163 } dsl_dataset_phys_t;
 164
 165 typedef struct dsl_dataset {
 166         dmu_buf_user_t ds_dbu;
 167         rrwlock_t ds_bp_rwlock; /* Protects ds_phys->ds_bp */
 168
 169         /* Immutable: */
 170         struct dsl_dir *ds_dir;
 171         dmu_buf_t *ds_dbuf;
 172         uint64_t ds_object;
 173         uint64_t ds_fsid_guid;
 174         boolean_t ds_is_snapshot;
 175         struct dsl_key_mapping *ds_key_mapping;
 176
 177         /* only used in syncing context, only valid for non-snapshots: */
 178         struct dsl_dataset *ds_prev;
 179         uint64_t ds_bookmarks;  /* DMU_OTN_ZAP_METADATA */
 180
 181         /* has internal locking: */
 182         dsl_deadlist_t ds_deadlist;
 183         bplist_t ds_pending_deadlist;
 184
 185         /*
 186          * The remap deadlist contains blocks (DVA's, really) that are
 187          * referenced by the previous snapshot and point to indirect vdevs,
 188          * but in this dataset they have been remapped to point to concrete
 189          * (or at least, less-indirect) vdevs.  In other words, the
 190          * physical DVA is referenced by the previous snapshot but not by
 191          * this dataset.  Logically, the DVA continues to be referenced,
 192          * but we are using a different (less indirect) physical DVA.
 193          * This deadlist is used to determine when physical DVAs that
 194          * point to indirect vdevs are no longer referenced anywhere,
 195          * and thus should be marked obsolete.
 196          *
 197          * This is only used if SPA_FEATURE_OBSOLETE_COUNTS is enabled.
 198          */
 199         dsl_deadlist_t ds_remap_deadlist;
 200         /* protects creation of the ds_remap_deadlist */
 201         kmutex_t ds_remap_deadlist_lock;
 202
 203         /* protected by lock on pool's dp_dirty_datasets list */
 204         txg_node_t ds_dirty_link;
 205         list_node_t ds_synced_link;
 206
 207         /*
 208          * ds_phys->ds_<accounting> is also protected by ds_lock.
 209          * Protected by ds_lock:
 210          */
 211         kmutex_t ds_lock;
 212         objset_t *ds_objset;
 213         uint64_t ds_userrefs;
 214         void *ds_owner;
 215
 216         /*
 217          * Long holds prevent the ds from being destroyed; they allow the
 218          * ds to remain held even after dropping the dp_config_rwlock.
 219          * Owning counts as a long hold.  See the comments above
 220          * dsl_pool_hold() for details.
 221          */
 222         zfs_refcount_t ds_longholds;
 223
 224         /* no locking; only for making guesses */
 225         uint64_t ds_trysnap_txg;
 226
 227         /* for objset_open() */
 228         kmutex_t ds_opening_lock;
 229
 230         uint64_t ds_reserved;   /* cached refreservation */
 231         uint64_t ds_quota;      /* cached refquota */
 232
 233         kmutex_t ds_sendstream_lock;
 234         list_t ds_sendstreams;
 235
 236         /*
 237          * When in the middle of a resumable receive, tracks how much
 238          * progress we have made.
 239          */
 240         uint64_t ds_resume_object[TXG_SIZE];
 241         uint64_t ds_resume_offset[TXG_SIZE];
 242         uint64_t ds_resume_bytes[TXG_SIZE];
 243
 244         /* Protected by our dsl_dir's dd_lock */
 245         list_t ds_prop_cbs;
 246
 247         /*
 248          * For ZFEATURE_FLAG_PER_DATASET features, set if this dataset
 249          * uses this feature.
 250          */
 251         void *ds_feature[SPA_FEATURES];
 252
 253         /*
 254          * Set if we need to activate the feature on this dataset this txg
 255          * (used only in syncing context).
 256          */
 257         void *ds_feature_activation[SPA_FEATURES];
 258
 259         /* Protected by ds_lock; keep at end of struct for better locality */
 260         char ds_snapname[ZFS_MAX_DATASET_NAME_LEN];
 261 } dsl_dataset_t;
 262
 263 static inline dsl_dataset_phys_t *
 264 dsl_dataset_phys(dsl_dataset_t *ds)
 265 {
 266         return (ds->ds_dbuf->db_data);
 267 }
 268
 269 typedef struct dsl_dataset_promote_arg {
 270         const char *ddpa_clonename;
 271         dsl_dataset_t *ddpa_clone;
 272         list_t shared_snaps, origin_snaps, clone_snaps;
 273         dsl_dataset_t *origin_origin; /* origin of the origin */
 274         uint64_t used, comp, uncomp, unique, cloneusedsnap, originusedsnap;
 275         nvlist_t *err_ds;
 276         cred_t *cr;
 277 } dsl_dataset_promote_arg_t;
 278
 279 typedef struct dsl_dataset_rollback_arg {
 280         const char *ddra_fsname;
 281         const char *ddra_tosnap;
 282         void *ddra_owner;
 283         nvlist_t *ddra_result;
 284 } dsl_dataset_rollback_arg_t;
 285
 286 typedef struct dsl_dataset_snapshot_arg {
 287         nvlist_t *ddsa_snaps;
 288         nvlist_t *ddsa_props;
 289         nvlist_t *ddsa_errors;
 290         cred_t *ddsa_cr;
 291 } dsl_dataset_snapshot_arg_t;
 292
 293 /*
 294  * The max length of a temporary tag prefix is the number of hex digits
 295  * required to express UINT64_MAX plus one for the hyphen.
 296  */
 297 #define MAX_TAG_PREFIX_LEN      17
 298
 299 #define dsl_dataset_is_snapshot(ds) \
 300         (dsl_dataset_phys(ds)->ds_num_children != 0)
 301
 302 #define DS_UNIQUE_IS_ACCURATE(ds)       \
 303         ((dsl_dataset_phys(ds)->ds_flags & DS_FLAG_UNIQUE_ACCURATE) != 0)
 304
 305 /* flags for holding the dataset */
 306 typedef enum ds_hold_flags {
 307         DS_HOLD_FLAG_DECRYPT    = 1 << 0 /* needs access to encrypted data */
 308 } ds_hold_flags_t;
 309
 310 int dsl_dataset_hold(struct dsl_pool *dp, const char *name, void *tag,
 311     dsl_dataset_t **dsp);
 312 int dsl_dataset_hold_flags(struct dsl_pool *dp, const char *name,
 313     ds_hold_flags_t flags, void *tag, dsl_dataset_t **dsp);
 314 boolean_t dsl_dataset_try_add_ref(struct dsl_pool *dp, dsl_dataset_t *ds,
 315     void *tag);
 316 int dsl_dataset_create_key_mapping(dsl_dataset_t *ds);
 317 int dsl_dataset_hold_obj(struct dsl_pool *dp, uint64_t dsobj, void *tag,
 318     dsl_dataset_t **);
 319 int dsl_dataset_hold_obj_flags(struct dsl_pool *dp, uint64_t dsobj,
 320     ds_hold_flags_t flags, void *tag, dsl_dataset_t **);
 321 void dsl_dataset_remove_key_mapping(dsl_dataset_t *ds);
 322 void dsl_dataset_rele(dsl_dataset_t *ds, void *tag);
 323 void dsl_dataset_rele_flags(dsl_dataset_t *ds, ds_hold_flags_t flags,
 324     void *tag);
 325 int dsl_dataset_own(struct dsl_pool *dp, const char *name,
 326     ds_hold_flags_t flags, void *tag, dsl_dataset_t **dsp);
 327 int dsl_dataset_own_obj(struct dsl_pool *dp, uint64_t dsobj,
 328     ds_hold_flags_t flags, void *tag, dsl_dataset_t **dsp);
 329 void dsl_dataset_disown(dsl_dataset_t *ds, ds_hold_flags_t flags, void *tag);
 330 void dsl_dataset_name(dsl_dataset_t *ds, char *name);
 331 int dsl_dataset_namelen(dsl_dataset_t *ds);
 332 boolean_t dsl_dataset_has_owner(dsl_dataset_t *ds);
 333 boolean_t dsl_dataset_tryown(dsl_dataset_t *ds, void *tag);
 334 uint64_t dsl_dataset_create_sync(dsl_dir_t *pds, const char *lastname,
 335     dsl_dataset_t *origin, uint64_t flags, cred_t *,
 336     struct dsl_crypto_params *, dmu_tx_t *);
 337 uint64_t dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin,
 338     struct dsl_crypto_params *dcp, uint64_t flags, dmu_tx_t *tx);
 339 void dsl_dataset_snapshot_sync(void *arg, dmu_tx_t *tx);
 340 int dsl_dataset_snapshot_check(void *arg, dmu_tx_t *tx);
 341 int dsl_dataset_snapshot(nvlist_t *snaps, nvlist_t *props, nvlist_t *errors);
 342 void dsl_dataset_promote_sync(void *arg, dmu_tx_t *tx);
 343 int dsl_dataset_promote_check(void *arg, dmu_tx_t *tx);
 344 int dsl_dataset_promote(const char *name, char *conflsnap);
 345 int dsl_dataset_rename_snapshot(const char *fsname,
 346     const char *oldsnapname, const char *newsnapname, boolean_t recursive);
 347 int dsl_dataset_snapshot_tmp(const char *fsname, const char *snapname,
 348     minor_t cleanup_minor, const char *htag);
 349
 350 blkptr_t *dsl_dataset_get_blkptr(dsl_dataset_t *ds);
 351
 352 spa_t *dsl_dataset_get_spa(dsl_dataset_t *ds);
 353
 354 boolean_t dsl_dataset_modified_since_snap(dsl_dataset_t *ds,
 355     dsl_dataset_t *snap);
 356
 357 void dsl_dataset_sync(dsl_dataset_t *ds, zio_t *zio, dmu_tx_t *tx);
 358 void dsl_dataset_sync_done(dsl_dataset_t *ds, dmu_tx_t *tx);
 359
 360 void dsl_dataset_block_born(dsl_dataset_t *ds, const blkptr_t *bp,
 361     dmu_tx_t *tx);
 362 int dsl_dataset_block_kill(dsl_dataset_t *ds, const blkptr_t *bp,
 363     dmu_tx_t *tx, boolean_t async);
 364 void dsl_dataset_block_remapped(dsl_dataset_t *ds, uint64_t vdev,
 365     uint64_t offset, uint64_t size, uint64_t birth, dmu_tx_t *tx);
 366 int dsl_dataset_snap_lookup(dsl_dataset_t *ds, const char *name,
 367     uint64_t *value);
 368
 369 void dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx);
 370
 371 int get_clones_stat_impl(dsl_dataset_t *ds, nvlist_t *val);
 372 char *get_receive_resume_stats_impl(dsl_dataset_t *ds);
 373 char *get_child_receive_stats(dsl_dataset_t *ds);
 374 uint64_t dsl_get_refratio(dsl_dataset_t *ds);
 375 uint64_t dsl_get_logicalreferenced(dsl_dataset_t *ds);
 376 uint64_t dsl_get_compressratio(dsl_dataset_t *ds);
 377 uint64_t dsl_get_used(dsl_dataset_t *ds);
 378 uint64_t dsl_get_creation(dsl_dataset_t *ds);
 379 uint64_t dsl_get_creationtxg(dsl_dataset_t *ds);
 380 uint64_t dsl_get_refquota(dsl_dataset_t *ds);
 381 uint64_t dsl_get_refreservation(dsl_dataset_t *ds);
 382 uint64_t dsl_get_guid(dsl_dataset_t *ds);
 383 uint64_t dsl_get_unique(dsl_dataset_t *ds);
 384 uint64_t dsl_get_objsetid(dsl_dataset_t *ds);
 385 uint64_t dsl_get_userrefs(dsl_dataset_t *ds);
 386 uint64_t dsl_get_defer_destroy(dsl_dataset_t *ds);
 387 uint64_t dsl_get_referenced(dsl_dataset_t *ds);
 388 uint64_t dsl_get_numclones(dsl_dataset_t *ds);
 389 uint64_t dsl_get_inconsistent(dsl_dataset_t *ds);
 390 uint64_t dsl_get_available(dsl_dataset_t *ds);
 391 int dsl_get_written(dsl_dataset_t *ds, uint64_t *written);
 392 int dsl_get_prev_snap(dsl_dataset_t *ds, char *snap);
 393 int dsl_get_mountpoint(dsl_dataset_t *ds, const char *dsname, char *value,
 394     char *source);
 395
 396 void get_clones_stat(dsl_dataset_t *ds, nvlist_t *nv);
 397 void dsl_dataset_stats(dsl_dataset_t *os, nvlist_t *nv);
 398
 399 void dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat);
 400 void dsl_dataset_space(dsl_dataset_t *ds,
 401     uint64_t *refdbytesp, uint64_t *availbytesp,
 402     uint64_t *usedobjsp, uint64_t *availobjsp);
 403 uint64_t dsl_dataset_fsid_guid(dsl_dataset_t *ds);
 404 int dsl_dataset_space_written(dsl_dataset_t *oldsnap, dsl_dataset_t *new,
 405     uint64_t *usedp, uint64_t *compp, uint64_t *uncompp);
 406 int dsl_dataset_space_wouldfree(dsl_dataset_t *firstsnap, dsl_dataset_t *last,
 407     uint64_t *usedp, uint64_t *compp, uint64_t *uncompp);
 408
 409 int dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf);
 410
 411 int dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota,
 412     uint64_t asize, uint64_t inflight, uint64_t *used,
 413     uint64_t *ref_rsrv);
 414 int dsl_dataset_set_refquota(const char *dsname, zprop_source_t source,
 415     uint64_t quota);
 416 int dsl_dataset_set_refreservation(const char *dsname, zprop_source_t source,
 417     uint64_t reservation);
 418
 419 boolean_t dsl_dataset_is_before(dsl_dataset_t *later, dsl_dataset_t *earlier,
 420     uint64_t earlier_txg);
 421 void dsl_dataset_long_hold(dsl_dataset_t *ds, void *tag);
 422 void dsl_dataset_long_rele(dsl_dataset_t *ds, void *tag);
 423 boolean_t dsl_dataset_long_held(dsl_dataset_t *ds);
 424
 425 int dsl_dataset_clone_swap_check_impl(dsl_dataset_t *clone,
 426     dsl_dataset_t *origin_head, boolean_t force, void *owner, dmu_tx_t *tx);
 427 void dsl_dataset_clone_swap_sync_impl(dsl_dataset_t *clone,
 428     dsl_dataset_t *origin_head, dmu_tx_t *tx);
 429 int dsl_dataset_snapshot_check_impl(dsl_dataset_t *ds, const char *snapname,
 430     dmu_tx_t *tx, boolean_t recv, uint64_t cnt, cred_t *cr);
 431 void dsl_dataset_snapshot_sync_impl(dsl_dataset_t *ds, const char *snapname,
 432     dmu_tx_t *tx);
 433
 434 void dsl_dataset_remove_from_next_clones(dsl_dataset_t *ds, uint64_t obj,
 435     dmu_tx_t *tx);
 436 void dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds);
 437 int dsl_dataset_get_snapname(dsl_dataset_t *ds);
 438 int dsl_dataset_snap_lookup(dsl_dataset_t *ds, const char *name,
 439     uint64_t *value);
 440 int dsl_dataset_snap_remove(dsl_dataset_t *ds, const char *name, dmu_tx_t *tx,
 441     boolean_t adj_cnt);
 442 void dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t *ds,
 443     zprop_source_t source, uint64_t value, dmu_tx_t *tx);
 444 void dsl_dataset_zapify(dsl_dataset_t *ds, dmu_tx_t *tx);
 445 boolean_t dsl_dataset_is_zapified(dsl_dataset_t *ds);
 446 boolean_t dsl_dataset_has_resume_receive_state(dsl_dataset_t *ds);
 447
 448 int dsl_dataset_rollback_check(void *arg, dmu_tx_t *tx);
 449 void dsl_dataset_rollback_sync(void *arg, dmu_tx_t *tx);
 450 int dsl_dataset_rollback(const char *fsname, const char *tosnap, void *owner,
 451     nvlist_t *result);
 452
 453 uint64_t dsl_dataset_get_remap_deadlist_object(dsl_dataset_t *ds);
 454 void dsl_dataset_create_remap_deadlist(dsl_dataset_t *ds, dmu_tx_t *tx);
 455 boolean_t dsl_dataset_remap_deadlist_exists(dsl_dataset_t *ds);
 456 void dsl_dataset_destroy_remap_deadlist(dsl_dataset_t *ds, dmu_tx_t *tx);
 457
 458 void dsl_dataset_activate_feature(uint64_t dsobj, spa_feature_t f, void *arg,
 459     dmu_tx_t *tx);
 460 void dsl_dataset_deactivate_feature(dsl_dataset_t *ds, spa_feature_t f,
 461     dmu_tx_t *tx);
 462 boolean_t dsl_dataset_feature_is_active(dsl_dataset_t *ds, spa_feature_t f);
 463 boolean_t dsl_dataset_get_uint64_array_feature(dsl_dataset_t *ds,
 464     spa_feature_t f, uint64_t *outlength, uint64_t **outp);
 465
 466 #ifdef ZFS_DEBUG
 467 #define dprintf_ds(ds, fmt, ...) do { \
 468         if (zfs_flags & ZFS_DEBUG_DPRINTF) { \
 469         char *__ds_name = kmem_alloc(ZFS_MAX_DATASET_NAME_LEN, KM_SLEEP); \
 470         dsl_dataset_name(ds, __ds_name); \
 471         dprintf("ds=%s " fmt, __ds_name, __VA_ARGS__); \
 472         kmem_free(__ds_name, ZFS_MAX_DATASET_NAME_LEN); \
 473         } \
 474 _NOTE(CONSTCOND) } while (0)
 475 #else
 476 #define dprintf_ds(dd, fmt, ...)
 477 #endif
 478
 479 #ifdef  __cplusplus
 480 }
 481 #endif
 482
 483 #endif /* _SYS_DSL_DATASET_H */