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, Joyent, Inc. All rights reserved.
25 * Copyright (c) 2013 Steven Hartland. All rights reserved.
26 * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
27 * Copyright (c) 2014 Integros [integros.com]
28 */
29
30 #ifndef _SYS_DSL_DATASET_H
31 #define _SYS_DSL_DATASET_H
32
33 #include <sys/dmu.h>
34 #include <sys/spa.h>
35 #include <sys/txg.h>
36 #include <sys/zio.h>
37 #include <sys/bplist.h>
38 #include <sys/dsl_synctask.h>
39 #include <sys/zfs_context.h>
40 #include <sys/dsl_deadlist.h>
41 #include <sys/refcount.h>
42 #include <sys/rrwlock.h>
43 #include <sys/dsl_crypt.h>
44 #include <zfeature_common.h>
45
46 #ifdef __cplusplus
47 extern "C" {
48 #endif
49
50 struct dsl_dataset;
51 struct dsl_dir;
52 struct dsl_pool;
53 struct dsl_crypto_params;
54 struct dsl_key_mapping;
55
56 #define DS_FLAG_INCONSISTENT (1ULL<<0)
57 #define DS_IS_INCONSISTENT(ds) \
58 (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_INCONSISTENT)
59
60 /*
61 * Do not allow this dataset to be promoted.
62 */
63 #define DS_FLAG_NOPROMOTE (1ULL<<1)
64
65 /*
66 * DS_FLAG_UNIQUE_ACCURATE is set if ds_unique_bytes has been correctly
67 * calculated for head datasets (starting with SPA_VERSION_UNIQUE_ACCURATE,
68 * refquota/refreservations).
69 */
70 #define DS_FLAG_UNIQUE_ACCURATE (1ULL<<2)
71
72 /*
73 * DS_FLAG_DEFER_DESTROY is set after 'zfs destroy -d' has been called
74 * on a dataset. This allows the dataset to be destroyed using 'zfs release'.
75 */
76 #define DS_FLAG_DEFER_DESTROY (1ULL<<3)
77 #define DS_IS_DEFER_DESTROY(ds) \
78 (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_DEFER_DESTROY)
79
80 /*
81 * DS_FIELD_* are strings that are used in the "extensified" dataset zap object.
82 * They should be of the format <reverse-dns>:<field>.
83 */
84
85 /*
86 * This field's value is the object ID of a zap object which contains the
87 * bookmarks of this dataset. If it is present, then this dataset is counted
88 * in the refcount of the SPA_FEATURES_BOOKMARKS feature.
89 */
90 #define DS_FIELD_BOOKMARK_NAMES "com.delphix:bookmarks"
91
92 /*
93 * This field is present (with value=0) if this dataset may contain large
94 * dnodes (>512B). If it is present, then this dataset is counted in the
95 * refcount of the SPA_FEATURE_LARGE_DNODE feature.
96 */
97 #define DS_FIELD_LARGE_DNODE "org.zfsonlinux:large_dnode"
98
99 /*
100 * These fields are set on datasets that are in the middle of a resumable
101 * receive, and allow the sender to resume the send if it is interrupted.
102 */
103 #define DS_FIELD_RESUME_FROMGUID "com.delphix:resume_fromguid"
104 #define DS_FIELD_RESUME_TONAME "com.delphix:resume_toname"
105 #define DS_FIELD_RESUME_TOGUID "com.delphix:resume_toguid"
106 #define DS_FIELD_RESUME_OBJECT "com.delphix:resume_object"
107 #define DS_FIELD_RESUME_OFFSET "com.delphix:resume_offset"
108 #define DS_FIELD_RESUME_BYTES "com.delphix:resume_bytes"
109 #define DS_FIELD_RESUME_LARGEBLOCK "com.delphix:resume_largeblockok"
110 #define DS_FIELD_RESUME_EMBEDOK "com.delphix:resume_embedok"
111 #define DS_FIELD_RESUME_COMPRESSOK "com.delphix:resume_compressok"
112 #define DS_FIELD_RESUME_RAWOK "com.datto:resume_rawok"
113
114 /*
115 * This field is set to the object number of the remap deadlist if one exists.
116 */
117 #define DS_FIELD_REMAP_DEADLIST "com.delphix:remap_deadlist"
118
119 /*
120 * This field is set to the ivset guid for encrypted snapshots. This is used
121 * for validating raw receives.
122 */
123 #define DS_FIELD_IVSET_GUID "com.datto:ivset_guid"
124
125 /*
126 * DS_FLAG_CI_DATASET is set if the dataset contains a file system whose
127 * name lookups should be performed case-insensitively.
128 */
129 #define DS_FLAG_CI_DATASET (1ULL<<16)
130
131 #define DS_CREATE_FLAG_NODIRTY (1ULL<<24)
132
133 typedef struct dsl_dataset_phys {
134 uint64_t ds_dir_obj; /* DMU_OT_DSL_DIR */
135 uint64_t ds_prev_snap_obj; /* DMU_OT_DSL_DATASET */
136 uint64_t ds_prev_snap_txg;
137 uint64_t ds_next_snap_obj; /* DMU_OT_DSL_DATASET */
138 uint64_t ds_snapnames_zapobj; /* DMU_OT_DSL_DS_SNAP_MAP 0 for snaps */
139 uint64_t ds_num_children; /* clone/snap children; ==0 for head */
140 uint64_t ds_creation_time; /* seconds since 1970 */
141 uint64_t ds_creation_txg;
142 uint64_t ds_deadlist_obj; /* DMU_OT_DEADLIST */
143 /*
144 * ds_referenced_bytes, ds_compressed_bytes, and ds_uncompressed_bytes
145 * include all blocks referenced by this dataset, including those
146 * shared with any other datasets.
147 */
148 uint64_t ds_referenced_bytes;
149 uint64_t ds_compressed_bytes;
150 uint64_t ds_uncompressed_bytes;
151 uint64_t ds_unique_bytes; /* only relevant to snapshots */
152 /*
153 * The ds_fsid_guid is a 56-bit ID that can change to avoid
154 * collisions. The ds_guid is a 64-bit ID that will never
155 * change, so there is a small probability that it will collide.
156 */
157 uint64_t ds_fsid_guid;
158 uint64_t ds_guid;
159 uint64_t ds_flags; /* DS_FLAG_* */
160 blkptr_t ds_bp;
161 uint64_t ds_next_clones_obj; /* DMU_OT_DSL_CLONES */
162 uint64_t ds_props_obj; /* DMU_OT_DSL_PROPS for snaps */
163 uint64_t ds_userrefs_obj; /* DMU_OT_USERREFS */
164 uint64_t ds_pad[5]; /* pad out to 320 bytes for good measure */
165 } dsl_dataset_phys_t;
166
167 typedef struct dsl_dataset {
168 dmu_buf_user_t ds_dbu;
169 rrwlock_t ds_bp_rwlock; /* Protects ds_phys->ds_bp */
170
171 /* Immutable: */
172 struct dsl_dir *ds_dir;
173 dmu_buf_t *ds_dbuf;
174 uint64_t ds_object;
175 uint64_t ds_fsid_guid;
176 boolean_t ds_is_snapshot;
177 struct dsl_key_mapping *ds_key_mapping;
178
179 /* only used in syncing context, only valid for non-snapshots: */
180 struct dsl_dataset *ds_prev;
181 uint64_t ds_bookmarks; /* DMU_OTN_ZAP_METADATA */
182
183 /* has internal locking: */
184 dsl_deadlist_t ds_deadlist;
185 bplist_t ds_pending_deadlist;
186
187 /*
188 * The remap deadlist contains blocks (DVA's, really) that are
189 * referenced by the previous snapshot and point to indirect vdevs,
190 * but in this dataset they have been remapped to point to concrete
191 * (or at least, less-indirect) vdevs. In other words, the
192 * physical DVA is referenced by the previous snapshot but not by
193 * this dataset. Logically, the DVA continues to be referenced,
194 * but we are using a different (less indirect) physical DVA.
195 * This deadlist is used to determine when physical DVAs that
196 * point to indirect vdevs are no longer referenced anywhere,
197 * and thus should be marked obsolete.
198 *
199 * This is only used if SPA_FEATURE_OBSOLETE_COUNTS is enabled.
200 */
201 dsl_deadlist_t ds_remap_deadlist;
202 /* protects creation of the ds_remap_deadlist */
203 kmutex_t ds_remap_deadlist_lock;
204
205 /* protected by lock on pool's dp_dirty_datasets list */
206 txg_node_t ds_dirty_link;
207 list_node_t ds_synced_link;
208
209 /*
210 * ds_phys->ds_<accounting> is also protected by ds_lock.
211 * Protected by ds_lock:
212 */
213 kmutex_t ds_lock;
214 objset_t *ds_objset;
215 uint64_t ds_userrefs;
216 void *ds_owner;
217
218 /*
219 * Long holds prevent the ds from being destroyed; they allow the
220 * ds to remain held even after dropping the dp_config_rwlock.
221 * Owning counts as a long hold. See the comments above
222 * dsl_pool_hold() for details.
223 */
224 zfs_refcount_t ds_longholds;
225
226 /* no locking; only for making guesses */
227 uint64_t ds_trysnap_txg;
228
229 /* for objset_open() */
230 kmutex_t ds_opening_lock;
231
232 uint64_t ds_reserved; /* cached refreservation */
233 uint64_t ds_quota; /* cached refquota */
234
235 kmutex_t ds_sendstream_lock;
236 list_t ds_sendstreams;
237
238 /*
239 * When in the middle of a resumable receive, tracks how much
240 * progress we have made.
241 */
242 uint64_t ds_resume_object[TXG_SIZE];
243 uint64_t ds_resume_offset[TXG_SIZE];
244 uint64_t ds_resume_bytes[TXG_SIZE];
245
246 /* Protected by our dsl_dir's dd_lock */
247 list_t ds_prop_cbs;
248
249 /*
250 * For ZFEATURE_FLAG_PER_DATASET features, set if this dataset
251 * uses this feature.
252 */
253 void *ds_feature[SPA_FEATURES];
254
255 /*
256 * Set if we need to activate the feature on this dataset this txg
257 * (used only in syncing context).
258 */
259 void *ds_feature_activation[SPA_FEATURES];
260
261 /* Protected by ds_lock; keep at end of struct for better locality */
262 char ds_snapname[ZFS_MAX_DATASET_NAME_LEN];
263 } dsl_dataset_t;
264
265 inline dsl_dataset_phys_t *
dsl_dataset_phys(dsl_dataset_t * ds)266 dsl_dataset_phys(dsl_dataset_t *ds)
267 {
268 return (ds->ds_dbuf->db_data);
269 }
270
271 typedef struct dsl_dataset_promote_arg {
272 const char *ddpa_clonename;
273 dsl_dataset_t *ddpa_clone;
274 list_t shared_snaps, origin_snaps, clone_snaps;
275 dsl_dataset_t *origin_origin; /* origin of the origin */
276 uint64_t used, comp, uncomp, unique, cloneusedsnap, originusedsnap;
277 nvlist_t *err_ds;
278 cred_t *cr;
279 } dsl_dataset_promote_arg_t;
280
281 typedef struct dsl_dataset_rollback_arg {
282 const char *ddra_fsname;
283 const char *ddra_tosnap;
284 void *ddra_owner;
285 nvlist_t *ddra_result;
286 } dsl_dataset_rollback_arg_t;
287
288 typedef struct dsl_dataset_snapshot_arg {
289 nvlist_t *ddsa_snaps;
290 nvlist_t *ddsa_props;
291 nvlist_t *ddsa_errors;
292 cred_t *ddsa_cr;
293 } dsl_dataset_snapshot_arg_t;
294
295 /*
296 * The max length of a temporary tag prefix is the number of hex digits
297 * required to express UINT64_MAX plus one for the hyphen.
298 */
299 #define MAX_TAG_PREFIX_LEN 17
300
301 #define dsl_dataset_is_snapshot(ds) \
302 (dsl_dataset_phys(ds)->ds_num_children != 0)
303
304 #define DS_UNIQUE_IS_ACCURATE(ds) \
305 ((dsl_dataset_phys(ds)->ds_flags & DS_FLAG_UNIQUE_ACCURATE) != 0)
306
307 /* flags for holding the dataset */
308 typedef enum ds_hold_flags {
309 DS_HOLD_FLAG_NONE = 0 << 0,
310 DS_HOLD_FLAG_DECRYPT = 1 << 0 /* needs access to encrypted data */
311 } ds_hold_flags_t;
312
313 int dsl_dataset_hold(struct dsl_pool *dp, const char *name, void *tag,
314 dsl_dataset_t **dsp);
315 int dsl_dataset_hold_flags(struct dsl_pool *dp, const char *name,
316 ds_hold_flags_t flags, void *tag, dsl_dataset_t **dsp);
317 boolean_t dsl_dataset_try_add_ref(struct dsl_pool *dp, dsl_dataset_t *ds,
318 void *tag);
319 int dsl_dataset_create_key_mapping(dsl_dataset_t *ds);
320 int dsl_dataset_hold_obj(struct dsl_pool *dp, uint64_t dsobj, void *tag,
321 dsl_dataset_t **);
322 int dsl_dataset_hold_obj_flags(struct dsl_pool *dp, uint64_t dsobj,
323 ds_hold_flags_t flags, void *tag, dsl_dataset_t **);
324 void dsl_dataset_remove_key_mapping(dsl_dataset_t *ds);
325 void dsl_dataset_rele(dsl_dataset_t *ds, void *tag);
326 void dsl_dataset_rele_flags(dsl_dataset_t *ds, ds_hold_flags_t flags,
327 void *tag);
328 int dsl_dataset_own(struct dsl_pool *dp, const char *name,
329 ds_hold_flags_t flags, void *tag, dsl_dataset_t **dsp);
330 int dsl_dataset_own_obj(struct dsl_pool *dp, uint64_t dsobj,
331 ds_hold_flags_t flags, void *tag, dsl_dataset_t **dsp);
332 void dsl_dataset_disown(dsl_dataset_t *ds, ds_hold_flags_t flags, void *tag);
333 void dsl_dataset_name(dsl_dataset_t *ds, char *name);
334 boolean_t dsl_dataset_tryown(dsl_dataset_t *ds, void *tag);
335 int dsl_dataset_namelen(dsl_dataset_t *ds);
336 boolean_t dsl_dataset_has_owner(dsl_dataset_t *ds);
337 uint64_t dsl_dataset_create_sync(dsl_dir_t *pds, const char *lastname,
338 dsl_dataset_t *origin, uint64_t flags, cred_t *,
339 struct dsl_crypto_params *, dmu_tx_t *);
340 uint64_t dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin,
341 struct dsl_crypto_params *dcp, uint64_t flags, dmu_tx_t *tx);
342 void dsl_dataset_snapshot_sync(void *arg, dmu_tx_t *tx);
343 int dsl_dataset_snapshot_check(void *arg, dmu_tx_t *tx);
344 int dsl_dataset_snapshot(nvlist_t *snaps, nvlist_t *props, nvlist_t *errors);
345 void dsl_dataset_promote_sync(void *arg, dmu_tx_t *tx);
346 int dsl_dataset_promote_check(void *arg, dmu_tx_t *tx);
347 int dsl_dataset_promote(const char *name, char *conflsnap);
348 int dsl_dataset_clone_swap(dsl_dataset_t *clone, dsl_dataset_t *origin_head,
349 boolean_t force);
350 int dsl_dataset_rename_snapshot(const char *fsname,
351 const char *oldsnapname, const char *newsnapname, boolean_t recursive);
352 int dsl_dataset_snapshot_tmp(const char *fsname, const char *snapname,
353 minor_t cleanup_minor, const char *htag);
354
355 blkptr_t *dsl_dataset_get_blkptr(dsl_dataset_t *ds);
356
357 spa_t *dsl_dataset_get_spa(dsl_dataset_t *ds);
358
359 boolean_t dsl_dataset_modified_since_snap(dsl_dataset_t *ds,
360 dsl_dataset_t *snap);
361
362 void dsl_dataset_sync(dsl_dataset_t *os, zio_t *zio, dmu_tx_t *tx);
363 void dsl_dataset_sync_done(dsl_dataset_t *os, dmu_tx_t *tx);
364
365 void dsl_dataset_block_born(dsl_dataset_t *ds, const blkptr_t *bp,
366 dmu_tx_t *tx);
367 int dsl_dataset_block_kill(dsl_dataset_t *ds, const blkptr_t *bp,
368 dmu_tx_t *tx, boolean_t async);
369 void dsl_dataset_block_remapped(dsl_dataset_t *ds, uint64_t vdev,
370 uint64_t offset, uint64_t size, uint64_t birth, dmu_tx_t *tx);
371
372 void dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx);
373
374 int get_clones_stat_impl(dsl_dataset_t *ds, nvlist_t *val);
375 char *get_receive_resume_stats_impl(dsl_dataset_t *ds);
376 char *get_child_receive_stats(dsl_dataset_t *ds);
377 uint64_t dsl_get_refratio(dsl_dataset_t *ds);
378 uint64_t dsl_get_logicalreferenced(dsl_dataset_t *ds);
379 uint64_t dsl_get_compressratio(dsl_dataset_t *ds);
380 uint64_t dsl_get_used(dsl_dataset_t *ds);
381 uint64_t dsl_get_creation(dsl_dataset_t *ds);
382 uint64_t dsl_get_creationtxg(dsl_dataset_t *ds);
383 uint64_t dsl_get_refquota(dsl_dataset_t *ds);
384 uint64_t dsl_get_refreservation(dsl_dataset_t *ds);
385 uint64_t dsl_get_guid(dsl_dataset_t *ds);
386 uint64_t dsl_get_unique(dsl_dataset_t *ds);
387 uint64_t dsl_get_objsetid(dsl_dataset_t *ds);
388 uint64_t dsl_get_userrefs(dsl_dataset_t *ds);
389 uint64_t dsl_get_defer_destroy(dsl_dataset_t *ds);
390 uint64_t dsl_get_referenced(dsl_dataset_t *ds);
391 uint64_t dsl_get_numclones(dsl_dataset_t *ds);
392 uint64_t dsl_get_inconsistent(dsl_dataset_t *ds);
393 uint64_t dsl_get_available(dsl_dataset_t *ds);
394 int dsl_get_written(dsl_dataset_t *ds, uint64_t *written);
395 int dsl_get_prev_snap(dsl_dataset_t *ds, char *snap);
396 int dsl_get_mountpoint(dsl_dataset_t *ds, const char *dsname, char *value,
397 char *source);
398
399 void get_clones_stat(dsl_dataset_t *ds, nvlist_t *nv);
400
401 void dsl_dataset_stats(dsl_dataset_t *os, nvlist_t *nv);
402
403 void dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat);
404 void dsl_dataset_space(dsl_dataset_t *ds,
405 uint64_t *refdbytesp, uint64_t *availbytesp,
406 uint64_t *usedobjsp, uint64_t *availobjsp);
407 uint64_t dsl_dataset_fsid_guid(dsl_dataset_t *ds);
408 int dsl_dataset_space_written(dsl_dataset_t *oldsnap, dsl_dataset_t *new,
409 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp);
410 int dsl_dataset_space_wouldfree(dsl_dataset_t *firstsnap, dsl_dataset_t *last,
411 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp);
412 boolean_t dsl_dataset_is_dirty(dsl_dataset_t *ds);
413
414 int dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf);
415
416 int dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota,
417 uint64_t asize, uint64_t inflight, uint64_t *used,
418 uint64_t *ref_rsrv);
419 int dsl_dataset_set_refquota(const char *dsname, zprop_source_t source,
420 uint64_t quota);
421 int dsl_dataset_set_refreservation(const char *dsname, zprop_source_t source,
422 uint64_t reservation);
423
424 boolean_t dsl_dataset_is_before(dsl_dataset_t *later, dsl_dataset_t *earlier,
425 uint64_t earlier_txg);
426 void dsl_dataset_long_hold(dsl_dataset_t *ds, void *tag);
427 void dsl_dataset_long_rele(dsl_dataset_t *ds, void *tag);
428 boolean_t dsl_dataset_long_held(dsl_dataset_t *ds);
429
430 int dsl_dataset_clone_swap_check_impl(dsl_dataset_t *clone,
431 dsl_dataset_t *origin_head, boolean_t force, void *owner, dmu_tx_t *tx);
432 void dsl_dataset_clone_swap_sync_impl(dsl_dataset_t *clone,
433 dsl_dataset_t *origin_head, dmu_tx_t *tx);
434 int dsl_dataset_snapshot_check_impl(dsl_dataset_t *ds, const char *snapname,
435 dmu_tx_t *tx, boolean_t recv, uint64_t cnt, cred_t *cr);
436 void dsl_dataset_snapshot_sync_impl(dsl_dataset_t *ds, const char *snapname,
437 dmu_tx_t *tx);
438
439 void dsl_dataset_remove_from_next_clones(dsl_dataset_t *ds, uint64_t obj,
440 dmu_tx_t *tx);
441 void dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds);
442 int dsl_dataset_get_snapname(dsl_dataset_t *ds);
443 int dsl_dataset_snap_lookup(dsl_dataset_t *ds, const char *name,
444 uint64_t *value);
445 int dsl_dataset_snap_remove(dsl_dataset_t *ds, const char *name, dmu_tx_t *tx,
446 boolean_t adj_cnt);
447 void dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t *ds,
448 zprop_source_t source, uint64_t value, dmu_tx_t *tx);
449 void dsl_dataset_zapify(dsl_dataset_t *ds, dmu_tx_t *tx);
450 boolean_t dsl_dataset_is_zapified(dsl_dataset_t *ds);
451 boolean_t dsl_dataset_has_resume_receive_state(dsl_dataset_t *ds);
452
453 int dsl_dataset_rollback_check(void *arg, dmu_tx_t *tx);
454 void dsl_dataset_rollback_sync(void *arg, dmu_tx_t *tx);
455 int dsl_dataset_rollback(const char *fsname, const char *tosnap, void *owner,
456 nvlist_t *result);
457
458 uint64_t dsl_dataset_get_remap_deadlist_object(dsl_dataset_t *ds);
459 void dsl_dataset_create_remap_deadlist(dsl_dataset_t *ds, dmu_tx_t *tx);
460 boolean_t dsl_dataset_remap_deadlist_exists(dsl_dataset_t *ds);
461 void dsl_dataset_destroy_remap_deadlist(dsl_dataset_t *ds, dmu_tx_t *tx);
462
463 void dsl_dataset_activate_feature(uint64_t dsobj, spa_feature_t f, void *arg,
464 dmu_tx_t *tx);
465 void dsl_dataset_deactivate_feature(dsl_dataset_t *ds, spa_feature_t f,
466 dmu_tx_t *tx);
467 boolean_t dsl_dataset_feature_is_active(dsl_dataset_t *ds, spa_feature_t f);
468 boolean_t dsl_dataset_get_uint64_array_feature(dsl_dataset_t *ds,
469 spa_feature_t f, uint64_t *outlength, uint64_t **outp);
470
471 #ifdef ZFS_DEBUG
472 #define dprintf_ds(ds, fmt, ...) do { \
473 if (zfs_flags & ZFS_DEBUG_DPRINTF) { \
474 char *__ds_name = kmem_alloc(ZFS_MAX_DATASET_NAME_LEN, KM_SLEEP); \
475 dsl_dataset_name(ds, __ds_name); \
476 dprintf("ds=%s " fmt, __ds_name, __VA_ARGS__); \
477 kmem_free(__ds_name, ZFS_MAX_DATASET_NAME_LEN); \
478 } \
479 _NOTE(CONSTCOND) } while (0)
480 #else
481 #define dprintf_ds(dd, fmt, ...)
482 #endif
483
484 #ifdef __cplusplus
485 }
486 #endif
487
488 #endif /* _SYS_DSL_DATASET_H */
489