xref: /illumos-gate/usr/src/uts/common/fs/zfs/bpobj.c (revision 62ba43a590f5c5aad74961c6c0d2c1703599b40c) 
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, 2016 by Delphix. All rights reserved.
24  * Copyright (c) 2014 Integros [integros.com]
25  * Copyright (c) 2017 Datto Inc.
26  */
27 
28 #include <sys/bpobj.h>
29 #include <sys/zfs_context.h>
30 #include <sys/refcount.h>
31 #include <sys/dsl_pool.h>
32 #include <sys/zfeature.h>
33 #include <sys/zap.h>
34 
35 /*
36  * Return an empty bpobj, preferably the empty dummy one (dp_empty_bpobj).
37  */
38 uint64_t
39 bpobj_alloc_empty(objset_t *os, int blocksize, dmu_tx_t *tx)
40 {
41 	spa_t *spa = dmu_objset_spa(os);
42 	dsl_pool_t *dp = dmu_objset_pool(os);
43 
44 	if (spa_feature_is_enabled(spa, SPA_FEATURE_EMPTY_BPOBJ)) {
45 		if (!spa_feature_is_active(spa, SPA_FEATURE_EMPTY_BPOBJ)) {
46 			ASSERT0(dp->dp_empty_bpobj);
47 			dp->dp_empty_bpobj =
48 			    bpobj_alloc(os, SPA_OLD_MAXBLOCKSIZE, tx);
49 			VERIFY(zap_add(os,
50 			    DMU_POOL_DIRECTORY_OBJECT,
51 			    DMU_POOL_EMPTY_BPOBJ, sizeof (uint64_t), 1,
52 			    &dp->dp_empty_bpobj, tx) == 0);
53 		}
54 		spa_feature_incr(spa, SPA_FEATURE_EMPTY_BPOBJ, tx);
55 		ASSERT(dp->dp_empty_bpobj != 0);
56 		return (dp->dp_empty_bpobj);
57 	} else {
58 		return (bpobj_alloc(os, blocksize, tx));
59 	}
60 }
61 
62 void
63 bpobj_decr_empty(objset_t *os, dmu_tx_t *tx)
64 {
65 	dsl_pool_t *dp = dmu_objset_pool(os);
66 
67 	spa_feature_decr(dmu_objset_spa(os), SPA_FEATURE_EMPTY_BPOBJ, tx);
68 	if (!spa_feature_is_active(dmu_objset_spa(os),
69 	    SPA_FEATURE_EMPTY_BPOBJ)) {
70 		VERIFY3U(0, ==, zap_remove(dp->dp_meta_objset,
71 		    DMU_POOL_DIRECTORY_OBJECT,
72 		    DMU_POOL_EMPTY_BPOBJ, tx));
73 		VERIFY3U(0, ==, dmu_object_free(os, dp->dp_empty_bpobj, tx));
74 		dp->dp_empty_bpobj = 0;
75 	}
76 }
77 
78 uint64_t
79 bpobj_alloc(objset_t *os, int blocksize, dmu_tx_t *tx)
80 {
81 	int size;
82 
83 	if (spa_version(dmu_objset_spa(os)) < SPA_VERSION_BPOBJ_ACCOUNT)
84 		size = BPOBJ_SIZE_V0;
85 	else if (spa_version(dmu_objset_spa(os)) < SPA_VERSION_DEADLISTS)
86 		size = BPOBJ_SIZE_V1;
87 	else
88 		size = sizeof (bpobj_phys_t);
89 
90 	return (dmu_object_alloc(os, DMU_OT_BPOBJ, blocksize,
91 	    DMU_OT_BPOBJ_HDR, size, tx));
92 }
93 
94 void
95 bpobj_free(objset_t *os, uint64_t obj, dmu_tx_t *tx)
96 {
97 	int64_t i;
98 	bpobj_t bpo;
99 	dmu_object_info_t doi;
100 	int epb;
101 	dmu_buf_t *dbuf = NULL;
102 
103 	ASSERT(obj != dmu_objset_pool(os)->dp_empty_bpobj);
104 	VERIFY3U(0, ==, bpobj_open(&bpo, os, obj));
105 
106 	mutex_enter(&bpo.bpo_lock);
107 
108 	if (!bpo.bpo_havesubobj || bpo.bpo_phys->bpo_subobjs == 0)
109 		goto out;
110 
111 	VERIFY3U(0, ==, dmu_object_info(os, bpo.bpo_phys->bpo_subobjs, &doi));
112 	epb = doi.doi_data_block_size / sizeof (uint64_t);
113 
114 	for (i = bpo.bpo_phys->bpo_num_subobjs - 1; i >= 0; i--) {
115 		uint64_t *objarray;
116 		uint64_t offset, blkoff;
117 
118 		offset = i * sizeof (uint64_t);
119 		blkoff = P2PHASE(i, epb);
120 
121 		if (dbuf == NULL || dbuf->db_offset > offset) {
122 			if (dbuf)
123 				dmu_buf_rele(dbuf, FTAG);
124 			VERIFY3U(0, ==, dmu_buf_hold(os,
125 			    bpo.bpo_phys->bpo_subobjs, offset, FTAG, &dbuf, 0));
126 		}
127 
128 		ASSERT3U(offset, >=, dbuf->db_offset);
129 		ASSERT3U(offset, <, dbuf->db_offset + dbuf->db_size);
130 
131 		objarray = dbuf->db_data;
132 		bpobj_free(os, objarray[blkoff], tx);
133 	}
134 	if (dbuf) {
135 		dmu_buf_rele(dbuf, FTAG);
136 		dbuf = NULL;
137 	}
138 	VERIFY3U(0, ==, dmu_object_free(os, bpo.bpo_phys->bpo_subobjs, tx));
139 
140 out:
141 	mutex_exit(&bpo.bpo_lock);
142 	bpobj_close(&bpo);
143 
144 	VERIFY3U(0, ==, dmu_object_free(os, obj, tx));
145 }
146 
147 int
148 bpobj_open(bpobj_t *bpo, objset_t *os, uint64_t object)
149 {
150 	dmu_object_info_t doi;
151 	int err;
152 
153 	err = dmu_object_info(os, object, &doi);
154 	if (err)
155 		return (err);
156 
157 	bzero(bpo, sizeof (*bpo));
158 	mutex_init(&bpo->bpo_lock, NULL, MUTEX_DEFAULT, NULL);
159 
160 	ASSERT(bpo->bpo_dbuf == NULL);
161 	ASSERT(bpo->bpo_phys == NULL);
162 	ASSERT(object != 0);
163 	ASSERT3U(doi.doi_type, ==, DMU_OT_BPOBJ);
164 	ASSERT3U(doi.doi_bonus_type, ==, DMU_OT_BPOBJ_HDR);
165 
166 	err = dmu_bonus_hold(os, object, bpo, &bpo->bpo_dbuf);
167 	if (err)
168 		return (err);
169 
170 	bpo->bpo_os = os;
171 	bpo->bpo_object = object;
172 	bpo->bpo_epb = doi.doi_data_block_size >> SPA_BLKPTRSHIFT;
173 	bpo->bpo_havecomp = (doi.doi_bonus_size > BPOBJ_SIZE_V0);
174 	bpo->bpo_havesubobj = (doi.doi_bonus_size > BPOBJ_SIZE_V1);
175 	bpo->bpo_phys = bpo->bpo_dbuf->db_data;
176 	return (0);
177 }
178 
179 void
180 bpobj_close(bpobj_t *bpo)
181 {
182 	/* Lame workaround for closing a bpobj that was never opened. */
183 	if (bpo->bpo_object == 0)
184 		return;
185 
186 	dmu_buf_rele(bpo->bpo_dbuf, bpo);
187 	if (bpo->bpo_cached_dbuf != NULL)
188 		dmu_buf_rele(bpo->bpo_cached_dbuf, bpo);
189 	bpo->bpo_dbuf = NULL;
190 	bpo->bpo_phys = NULL;
191 	bpo->bpo_cached_dbuf = NULL;
192 	bpo->bpo_object = 0;
193 
194 	mutex_destroy(&bpo->bpo_lock);
195 }
196 
197 static boolean_t
198 bpobj_hasentries(bpobj_t *bpo)
199 {
200 	return (bpo->bpo_phys->bpo_num_blkptrs != 0 ||
201 	    (bpo->bpo_havesubobj && bpo->bpo_phys->bpo_num_subobjs != 0));
202 }
203 
204 static int
205 bpobj_iterate_impl(bpobj_t *bpo, bpobj_itor_t func, void *arg, dmu_tx_t *tx,
206     boolean_t free)
207 {
208 	dmu_object_info_t doi;
209 	int epb;
210 	int64_t i;
211 	int err = 0;
212 	dmu_buf_t *dbuf = NULL;
213 
214 	mutex_enter(&bpo->bpo_lock);
215 
216 	if (!bpobj_hasentries(bpo))
217 		goto out;
218 
219 	if (free)
220 		dmu_buf_will_dirty(bpo->bpo_dbuf, tx);
221 
222 	for (i = bpo->bpo_phys->bpo_num_blkptrs - 1; i >= 0; i--) {
223 		blkptr_t *bparray;
224 		blkptr_t *bp;
225 		uint64_t offset, blkoff;
226 
227 		offset = i * sizeof (blkptr_t);
228 		blkoff = P2PHASE(i, bpo->bpo_epb);
229 
230 		if (dbuf == NULL || dbuf->db_offset > offset) {
231 			if (dbuf)
232 				dmu_buf_rele(dbuf, FTAG);
233 			err = dmu_buf_hold(bpo->bpo_os, bpo->bpo_object, offset,
234 			    FTAG, &dbuf, 0);
235 			if (err)
236 				break;
237 		}
238 
239 		ASSERT3U(offset, >=, dbuf->db_offset);
240 		ASSERT3U(offset, <, dbuf->db_offset + dbuf->db_size);
241 
242 		bparray = dbuf->db_data;
243 		bp = &bparray[blkoff];
244 		err = func(arg, bp, tx);
245 		if (err)
246 			break;
247 		if (free) {
248 			bpo->bpo_phys->bpo_bytes -=
249 			    bp_get_dsize_sync(dmu_objset_spa(bpo->bpo_os), bp);
250 			ASSERT3S(bpo->bpo_phys->bpo_bytes, >=, 0);
251 			if (bpo->bpo_havecomp) {
252 				bpo->bpo_phys->bpo_comp -= BP_GET_PSIZE(bp);
253 				bpo->bpo_phys->bpo_uncomp -= BP_GET_UCSIZE(bp);
254 			}
255 			bpo->bpo_phys->bpo_num_blkptrs--;
256 			ASSERT3S(bpo->bpo_phys->bpo_num_blkptrs, >=, 0);
257 		}
258 	}
259 	if (dbuf) {
260 		dmu_buf_rele(dbuf, FTAG);
261 		dbuf = NULL;
262 	}
263 	if (free) {
264 		VERIFY3U(0, ==, dmu_free_range(bpo->bpo_os, bpo->bpo_object,
265 		    (i + 1) * sizeof (blkptr_t), -1ULL, tx));
266 	}
267 	if (err || !bpo->bpo_havesubobj || bpo->bpo_phys->bpo_subobjs == 0)
268 		goto out;
269 
270 	ASSERT(bpo->bpo_havecomp);
271 	err = dmu_object_info(bpo->bpo_os, bpo->bpo_phys->bpo_subobjs, &doi);
272 	if (err) {
273 		mutex_exit(&bpo->bpo_lock);
274 		return (err);
275 	}
276 	ASSERT3U(doi.doi_type, ==, DMU_OT_BPOBJ_SUBOBJ);
277 	epb = doi.doi_data_block_size / sizeof (uint64_t);
278 
279 	for (i = bpo->bpo_phys->bpo_num_subobjs - 1; i >= 0; i--) {
280 		uint64_t *objarray;
281 		uint64_t offset, blkoff;
282 		bpobj_t sublist;
283 		uint64_t used_before, comp_before, uncomp_before;
284 		uint64_t used_after, comp_after, uncomp_after;
285 
286 		offset = i * sizeof (uint64_t);
287 		blkoff = P2PHASE(i, epb);
288 
289 		if (dbuf == NULL || dbuf->db_offset > offset) {
290 			if (dbuf)
291 				dmu_buf_rele(dbuf, FTAG);
292 			err = dmu_buf_hold(bpo->bpo_os,
293 			    bpo->bpo_phys->bpo_subobjs, offset, FTAG, &dbuf, 0);
294 			if (err)
295 				break;
296 		}
297 
298 		ASSERT3U(offset, >=, dbuf->db_offset);
299 		ASSERT3U(offset, <, dbuf->db_offset + dbuf->db_size);
300 
301 		objarray = dbuf->db_data;
302 		err = bpobj_open(&sublist, bpo->bpo_os, objarray[blkoff]);
303 		if (err)
304 			break;
305 		if (free) {
306 			err = bpobj_space(&sublist,
307 			    &used_before, &comp_before, &uncomp_before);
308 			if (err != 0) {
309 				bpobj_close(&sublist);
310 				break;
311 			}
312 		}
313 		err = bpobj_iterate_impl(&sublist, func, arg, tx, free);
314 		if (free) {
315 			VERIFY3U(0, ==, bpobj_space(&sublist,
316 			    &used_after, &comp_after, &uncomp_after));
317 			bpo->bpo_phys->bpo_bytes -= used_before - used_after;
318 			ASSERT3S(bpo->bpo_phys->bpo_bytes, >=, 0);
319 			bpo->bpo_phys->bpo_comp -= comp_before - comp_after;
320 			bpo->bpo_phys->bpo_uncomp -=
321 			    uncomp_before - uncomp_after;
322 		}
323 
324 		bpobj_close(&sublist);
325 		if (err)
326 			break;
327 		if (free) {
328 			err = dmu_object_free(bpo->bpo_os,
329 			    objarray[blkoff], tx);
330 			if (err)
331 				break;
332 			bpo->bpo_phys->bpo_num_subobjs--;
333 			ASSERT3S(bpo->bpo_phys->bpo_num_subobjs, >=, 0);
334 		}
335 	}
336 	if (dbuf) {
337 		dmu_buf_rele(dbuf, FTAG);
338 		dbuf = NULL;
339 	}
340 	if (free) {
341 		VERIFY3U(0, ==, dmu_free_range(bpo->bpo_os,
342 		    bpo->bpo_phys->bpo_subobjs,
343 		    (i + 1) * sizeof (uint64_t), -1ULL, tx));
344 	}
345 
346 out:
347 	/* If there are no entries, there should be no bytes. */
348 	if (!bpobj_hasentries(bpo)) {
349 		ASSERT0(bpo->bpo_phys->bpo_bytes);
350 		ASSERT0(bpo->bpo_phys->bpo_comp);
351 		ASSERT0(bpo->bpo_phys->bpo_uncomp);
352 	}
353 
354 	mutex_exit(&bpo->bpo_lock);
355 	return (err);
356 }
357 
358 /*
359  * Iterate and remove the entries.  If func returns nonzero, iteration
360  * will stop and that entry will not be removed.
361  */
362 int
363 bpobj_iterate(bpobj_t *bpo, bpobj_itor_t func, void *arg, dmu_tx_t *tx)
364 {
365 	return (bpobj_iterate_impl(bpo, func, arg, tx, B_TRUE));
366 }
367 
368 /*
369  * Iterate the entries.  If func returns nonzero, iteration will stop.
370  */
371 int
372 bpobj_iterate_nofree(bpobj_t *bpo, bpobj_itor_t func, void *arg, dmu_tx_t *tx)
373 {
374 	return (bpobj_iterate_impl(bpo, func, arg, tx, B_FALSE));
375 }
376 
377 void
378 bpobj_enqueue_subobj(bpobj_t *bpo, uint64_t subobj, dmu_tx_t *tx)
379 {
380 	bpobj_t subbpo;
381 	uint64_t used, comp, uncomp, subsubobjs;
382 
383 	ASSERT(bpo->bpo_havesubobj);
384 	ASSERT(bpo->bpo_havecomp);
385 	ASSERT(bpo->bpo_object != dmu_objset_pool(bpo->bpo_os)->dp_empty_bpobj);
386 
387 	if (subobj == dmu_objset_pool(bpo->bpo_os)->dp_empty_bpobj) {
388 		bpobj_decr_empty(bpo->bpo_os, tx);
389 		return;
390 	}
391 
392 	VERIFY3U(0, ==, bpobj_open(&subbpo, bpo->bpo_os, subobj));
393 	VERIFY3U(0, ==, bpobj_space(&subbpo, &used, &comp, &uncomp));
394 
395 	if (!bpobj_hasentries(&subbpo)) {
396 		/* No point in having an empty subobj. */
397 		bpobj_close(&subbpo);
398 		bpobj_free(bpo->bpo_os, subobj, tx);
399 		return;
400 	}
401 
402 	mutex_enter(&bpo->bpo_lock);
403 	dmu_buf_will_dirty(bpo->bpo_dbuf, tx);
404 	if (bpo->bpo_phys->bpo_subobjs == 0) {
405 		bpo->bpo_phys->bpo_subobjs = dmu_object_alloc(bpo->bpo_os,
406 		    DMU_OT_BPOBJ_SUBOBJ, SPA_OLD_MAXBLOCKSIZE,
407 		    DMU_OT_NONE, 0, tx);
408 	}
409 
410 	dmu_object_info_t doi;
411 	ASSERT0(dmu_object_info(bpo->bpo_os, bpo->bpo_phys->bpo_subobjs, &doi));
412 	ASSERT3U(doi.doi_type, ==, DMU_OT_BPOBJ_SUBOBJ);
413 
414 	dmu_write(bpo->bpo_os, bpo->bpo_phys->bpo_subobjs,
415 	    bpo->bpo_phys->bpo_num_subobjs * sizeof (subobj),
416 	    sizeof (subobj), &subobj, tx);
417 	bpo->bpo_phys->bpo_num_subobjs++;
418 
419 	/*
420 	 * If subobj has only one block of subobjs, then move subobj's
421 	 * subobjs to bpo's subobj list directly.  This reduces
422 	 * recursion in bpobj_iterate due to nested subobjs.
423 	 */
424 	subsubobjs = subbpo.bpo_phys->bpo_subobjs;
425 	if (subsubobjs != 0) {
426 		dmu_object_info_t doi;
427 
428 		VERIFY3U(0, ==, dmu_object_info(bpo->bpo_os, subsubobjs, &doi));
429 		if (doi.doi_max_offset == doi.doi_data_block_size) {
430 			dmu_buf_t *subdb;
431 			uint64_t numsubsub = subbpo.bpo_phys->bpo_num_subobjs;
432 
433 			VERIFY3U(0, ==, dmu_buf_hold(bpo->bpo_os, subsubobjs,
434 			    0, FTAG, &subdb, 0));
435 			/*
436 			 * Make sure that we are not asking dmu_write()
437 			 * to write more data than we have in our buffer.
438 			 */
439 			VERIFY3U(subdb->db_size, >=,
440 			    numsubsub * sizeof (subobj));
441 			dmu_write(bpo->bpo_os, bpo->bpo_phys->bpo_subobjs,
442 			    bpo->bpo_phys->bpo_num_subobjs * sizeof (subobj),
443 			    numsubsub * sizeof (subobj), subdb->db_data, tx);
444 			dmu_buf_rele(subdb, FTAG);
445 			bpo->bpo_phys->bpo_num_subobjs += numsubsub;
446 
447 			dmu_buf_will_dirty(subbpo.bpo_dbuf, tx);
448 			subbpo.bpo_phys->bpo_subobjs = 0;
449 			VERIFY3U(0, ==, dmu_object_free(bpo->bpo_os,
450 			    subsubobjs, tx));
451 		}
452 	}
453 	bpo->bpo_phys->bpo_bytes += used;
454 	bpo->bpo_phys->bpo_comp += comp;
455 	bpo->bpo_phys->bpo_uncomp += uncomp;
456 	mutex_exit(&bpo->bpo_lock);
457 
458 	bpobj_close(&subbpo);
459 }
460 
461 void
462 bpobj_enqueue(bpobj_t *bpo, const blkptr_t *bp, dmu_tx_t *tx)
463 {
464 	blkptr_t stored_bp = *bp;
465 	uint64_t offset;
466 	int blkoff;
467 	blkptr_t *bparray;
468 
469 	ASSERT(!BP_IS_HOLE(bp));
470 	ASSERT(bpo->bpo_object != dmu_objset_pool(bpo->bpo_os)->dp_empty_bpobj);
471 
472 	if (BP_IS_EMBEDDED(bp)) {
473 		/*
474 		 * The bpobj will compress better without the payload.
475 		 *
476 		 * Note that we store EMBEDDED bp's because they have an
477 		 * uncompressed size, which must be accounted for.  An
478 		 * alternative would be to add their size to bpo_uncomp
479 		 * without storing the bp, but that would create additional
480 		 * complications: bpo_uncomp would be inconsistent with the
481 		 * set of BP's stored, and bpobj_iterate() wouldn't visit
482 		 * all the space accounted for in the bpobj.
483 		 */
484 		bzero(&stored_bp, sizeof (stored_bp));
485 		stored_bp.blk_prop = bp->blk_prop;
486 		stored_bp.blk_birth = bp->blk_birth;
487 	} else if (!BP_GET_DEDUP(bp)) {
488 		/* The bpobj will compress better without the checksum */
489 		bzero(&stored_bp.blk_cksum, sizeof (stored_bp.blk_cksum));
490 	}
491 
492 	/* We never need the fill count. */
493 	stored_bp.blk_fill = 0;
494 
495 	mutex_enter(&bpo->bpo_lock);
496 
497 	offset = bpo->bpo_phys->bpo_num_blkptrs * sizeof (stored_bp);
498 	blkoff = P2PHASE(bpo->bpo_phys->bpo_num_blkptrs, bpo->bpo_epb);
499 
500 	if (bpo->bpo_cached_dbuf == NULL ||
501 	    offset < bpo->bpo_cached_dbuf->db_offset ||
502 	    offset >= bpo->bpo_cached_dbuf->db_offset +
503 	    bpo->bpo_cached_dbuf->db_size) {
504 		if (bpo->bpo_cached_dbuf)
505 			dmu_buf_rele(bpo->bpo_cached_dbuf, bpo);
506 		VERIFY3U(0, ==, dmu_buf_hold(bpo->bpo_os, bpo->bpo_object,
507 		    offset, bpo, &bpo->bpo_cached_dbuf, 0));
508 	}
509 
510 	dmu_buf_will_dirty(bpo->bpo_cached_dbuf, tx);
511 	bparray = bpo->bpo_cached_dbuf->db_data;
512 	bparray[blkoff] = stored_bp;
513 
514 	dmu_buf_will_dirty(bpo->bpo_dbuf, tx);
515 	bpo->bpo_phys->bpo_num_blkptrs++;
516 	bpo->bpo_phys->bpo_bytes +=
517 	    bp_get_dsize_sync(dmu_objset_spa(bpo->bpo_os), bp);
518 	if (bpo->bpo_havecomp) {
519 		bpo->bpo_phys->bpo_comp += BP_GET_PSIZE(bp);
520 		bpo->bpo_phys->bpo_uncomp += BP_GET_UCSIZE(bp);
521 	}
522 	mutex_exit(&bpo->bpo_lock);
523 }
524 
525 struct space_range_arg {
526 	spa_t *spa;
527 	uint64_t mintxg;
528 	uint64_t maxtxg;
529 	uint64_t used;
530 	uint64_t comp;
531 	uint64_t uncomp;
532 };
533 
534 /* ARGSUSED */
535 static int
536 space_range_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx)
537 {
538 	struct space_range_arg *sra = arg;
539 
540 	if (bp->blk_birth > sra->mintxg && bp->blk_birth <= sra->maxtxg) {
541 		if (dsl_pool_sync_context(spa_get_dsl(sra->spa)))
542 			sra->used += bp_get_dsize_sync(sra->spa, bp);
543 		else
544 			sra->used += bp_get_dsize(sra->spa, bp);
545 		sra->comp += BP_GET_PSIZE(bp);
546 		sra->uncomp += BP_GET_UCSIZE(bp);
547 	}
548 	return (0);
549 }
550 
551 int
552 bpobj_space(bpobj_t *bpo, uint64_t *usedp, uint64_t *compp, uint64_t *uncompp)
553 {
554 	mutex_enter(&bpo->bpo_lock);
555 
556 	*usedp = bpo->bpo_phys->bpo_bytes;
557 	if (bpo->bpo_havecomp) {
558 		*compp = bpo->bpo_phys->bpo_comp;
559 		*uncompp = bpo->bpo_phys->bpo_uncomp;
560 		mutex_exit(&bpo->bpo_lock);
561 		return (0);
562 	} else {
563 		mutex_exit(&bpo->bpo_lock);
564 		return (bpobj_space_range(bpo, 0, UINT64_MAX,
565 		    usedp, compp, uncompp));
566 	}
567 }
568 
569 /*
570  * Return the amount of space in the bpobj which is:
571  * mintxg < blk_birth <= maxtxg
572  */
573 int
574 bpobj_space_range(bpobj_t *bpo, uint64_t mintxg, uint64_t maxtxg,
575     uint64_t *usedp, uint64_t *compp, uint64_t *uncompp)
576 {
577 	struct space_range_arg sra = { 0 };
578 	int err;
579 
580 	/*
581 	 * As an optimization, if they want the whole txg range, just
582 	 * get bpo_bytes rather than iterating over the bps.
583 	 */
584 	if (mintxg < TXG_INITIAL && maxtxg == UINT64_MAX && bpo->bpo_havecomp)
585 		return (bpobj_space(bpo, usedp, compp, uncompp));
586 
587 	sra.spa = dmu_objset_spa(bpo->bpo_os);
588 	sra.mintxg = mintxg;
589 	sra.maxtxg = maxtxg;
590 
591 	err = bpobj_iterate_nofree(bpo, space_range_cb, &sra, NULL);
592 	*usedp = sra.used;
593 	*compp = sra.comp;
594 	*uncompp = sra.uncomp;
595 	return (err);
596 }
597