xref: /titanic_41/usr/src/uts/common/fs/zfs/bpobj.c (revision 1b7435644ebe3112993d73003e61f1bf7125440b) 
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) 2013 by Delphix. All rights reserved.
24  */
25 
26 #include <sys/bpobj.h>
27 #include <sys/zfs_context.h>
28 #include <sys/refcount.h>
29 #include <sys/dsl_pool.h>
30 #include <sys/zfeature.h>
31 #include <sys/zap.h>
32 
33 /*
34  * Return an empty bpobj, preferably the empty dummy one (dp_empty_bpobj).
35  */
36 uint64_t
37 bpobj_alloc_empty(objset_t *os, int blocksize, dmu_tx_t *tx)
38 {
39 	spa_t *spa = dmu_objset_spa(os);
40 	dsl_pool_t *dp = dmu_objset_pool(os);
41 
42 	if (spa_feature_is_enabled(spa, SPA_FEATURE_EMPTY_BPOBJ)) {
43 		if (!spa_feature_is_active(spa, SPA_FEATURE_EMPTY_BPOBJ)) {
44 			ASSERT0(dp->dp_empty_bpobj);
45 			dp->dp_empty_bpobj =
46 			    bpobj_alloc(os, SPA_MAXBLOCKSIZE, tx);
47 			VERIFY(zap_add(os,
48 			    DMU_POOL_DIRECTORY_OBJECT,
49 			    DMU_POOL_EMPTY_BPOBJ, sizeof (uint64_t), 1,
50 			    &dp->dp_empty_bpobj, tx) == 0);
51 		}
52 		spa_feature_incr(spa, SPA_FEATURE_EMPTY_BPOBJ, tx);
53 		ASSERT(dp->dp_empty_bpobj != 0);
54 		return (dp->dp_empty_bpobj);
55 	} else {
56 		return (bpobj_alloc(os, blocksize, tx));
57 	}
58 }
59 
60 void
61 bpobj_decr_empty(objset_t *os, dmu_tx_t *tx)
62 {
63 	dsl_pool_t *dp = dmu_objset_pool(os);
64 
65 	spa_feature_decr(dmu_objset_spa(os), SPA_FEATURE_EMPTY_BPOBJ, tx);
66 	if (!spa_feature_is_active(dmu_objset_spa(os),
67 	    SPA_FEATURE_EMPTY_BPOBJ)) {
68 		VERIFY3U(0, ==, zap_remove(dp->dp_meta_objset,
69 		    DMU_POOL_DIRECTORY_OBJECT,
70 		    DMU_POOL_EMPTY_BPOBJ, tx));
71 		VERIFY3U(0, ==, dmu_object_free(os, dp->dp_empty_bpobj, tx));
72 		dp->dp_empty_bpobj = 0;
73 	}
74 }
75 
76 uint64_t
77 bpobj_alloc(objset_t *os, int blocksize, dmu_tx_t *tx)
78 {
79 	int size;
80 
81 	if (spa_version(dmu_objset_spa(os)) < SPA_VERSION_BPOBJ_ACCOUNT)
82 		size = BPOBJ_SIZE_V0;
83 	else if (spa_version(dmu_objset_spa(os)) < SPA_VERSION_DEADLISTS)
84 		size = BPOBJ_SIZE_V1;
85 	else
86 		size = sizeof (bpobj_phys_t);
87 
88 	return (dmu_object_alloc(os, DMU_OT_BPOBJ, blocksize,
89 	    DMU_OT_BPOBJ_HDR, size, tx));
90 }
91 
92 void
93 bpobj_free(objset_t *os, uint64_t obj, dmu_tx_t *tx)
94 {
95 	int64_t i;
96 	bpobj_t bpo;
97 	dmu_object_info_t doi;
98 	int epb;
99 	dmu_buf_t *dbuf = NULL;
100 
101 	ASSERT(obj != dmu_objset_pool(os)->dp_empty_bpobj);
102 	VERIFY3U(0, ==, bpobj_open(&bpo, os, obj));
103 
104 	mutex_enter(&bpo.bpo_lock);
105 
106 	if (!bpo.bpo_havesubobj || bpo.bpo_phys->bpo_subobjs == 0)
107 		goto out;
108 
109 	VERIFY3U(0, ==, dmu_object_info(os, bpo.bpo_phys->bpo_subobjs, &doi));
110 	epb = doi.doi_data_block_size / sizeof (uint64_t);
111 
112 	for (i = bpo.bpo_phys->bpo_num_subobjs - 1; i >= 0; i--) {
113 		uint64_t *objarray;
114 		uint64_t offset, blkoff;
115 
116 		offset = i * sizeof (uint64_t);
117 		blkoff = P2PHASE(i, epb);
118 
119 		if (dbuf == NULL || dbuf->db_offset > offset) {
120 			if (dbuf)
121 				dmu_buf_rele(dbuf, FTAG);
122 			VERIFY3U(0, ==, dmu_buf_hold(os,
123 			    bpo.bpo_phys->bpo_subobjs, offset, FTAG, &dbuf, 0));
124 		}
125 
126 		ASSERT3U(offset, >=, dbuf->db_offset);
127 		ASSERT3U(offset, <, dbuf->db_offset + dbuf->db_size);
128 
129 		objarray = dbuf->db_data;
130 		bpobj_free(os, objarray[blkoff], tx);
131 	}
132 	if (dbuf) {
133 		dmu_buf_rele(dbuf, FTAG);
134 		dbuf = NULL;
135 	}
136 	VERIFY3U(0, ==, dmu_object_free(os, bpo.bpo_phys->bpo_subobjs, tx));
137 
138 out:
139 	mutex_exit(&bpo.bpo_lock);
140 	bpobj_close(&bpo);
141 
142 	VERIFY3U(0, ==, dmu_object_free(os, obj, tx));
143 }
144 
145 int
146 bpobj_open(bpobj_t *bpo, objset_t *os, uint64_t object)
147 {
148 	dmu_object_info_t doi;
149 	int err;
150 
151 	err = dmu_object_info(os, object, &doi);
152 	if (err)
153 		return (err);
154 
155 	bzero(bpo, sizeof (*bpo));
156 	mutex_init(&bpo->bpo_lock, NULL, MUTEX_DEFAULT, NULL);
157 
158 	ASSERT(bpo->bpo_dbuf == NULL);
159 	ASSERT(bpo->bpo_phys == NULL);
160 	ASSERT(object != 0);
161 	ASSERT3U(doi.doi_type, ==, DMU_OT_BPOBJ);
162 	ASSERT3U(doi.doi_bonus_type, ==, DMU_OT_BPOBJ_HDR);
163 
164 	err = dmu_bonus_hold(os, object, bpo, &bpo->bpo_dbuf);
165 	if (err)
166 		return (err);
167 
168 	bpo->bpo_os = os;
169 	bpo->bpo_object = object;
170 	bpo->bpo_epb = doi.doi_data_block_size >> SPA_BLKPTRSHIFT;
171 	bpo->bpo_havecomp = (doi.doi_bonus_size > BPOBJ_SIZE_V0);
172 	bpo->bpo_havesubobj = (doi.doi_bonus_size > BPOBJ_SIZE_V1);
173 	bpo->bpo_phys = bpo->bpo_dbuf->db_data;
174 	return (0);
175 }
176 
177 void
178 bpobj_close(bpobj_t *bpo)
179 {
180 	/* Lame workaround for closing a bpobj that was never opened. */
181 	if (bpo->bpo_object == 0)
182 		return;
183 
184 	dmu_buf_rele(bpo->bpo_dbuf, bpo);
185 	if (bpo->bpo_cached_dbuf != NULL)
186 		dmu_buf_rele(bpo->bpo_cached_dbuf, bpo);
187 	bpo->bpo_dbuf = NULL;
188 	bpo->bpo_phys = NULL;
189 	bpo->bpo_cached_dbuf = NULL;
190 	bpo->bpo_object = 0;
191 
192 	mutex_destroy(&bpo->bpo_lock);
193 }
194 
195 static boolean_t
196 bpobj_hasentries(bpobj_t *bpo)
197 {
198 	return (bpo->bpo_phys->bpo_num_blkptrs != 0 ||
199 	    (bpo->bpo_havesubobj && bpo->bpo_phys->bpo_num_subobjs != 0));
200 }
201 
202 static int
203 bpobj_iterate_impl(bpobj_t *bpo, bpobj_itor_t func, void *arg, dmu_tx_t *tx,
204     boolean_t free)
205 {
206 	dmu_object_info_t doi;
207 	int epb;
208 	int64_t i;
209 	int err = 0;
210 	dmu_buf_t *dbuf = NULL;
211 
212 	mutex_enter(&bpo->bpo_lock);
213 
214 	if (free)
215 		dmu_buf_will_dirty(bpo->bpo_dbuf, tx);
216 
217 	for (i = bpo->bpo_phys->bpo_num_blkptrs - 1; i >= 0; i--) {
218 		blkptr_t *bparray;
219 		blkptr_t *bp;
220 		uint64_t offset, blkoff;
221 
222 		offset = i * sizeof (blkptr_t);
223 		blkoff = P2PHASE(i, bpo->bpo_epb);
224 
225 		if (dbuf == NULL || dbuf->db_offset > offset) {
226 			if (dbuf)
227 				dmu_buf_rele(dbuf, FTAG);
228 			err = dmu_buf_hold(bpo->bpo_os, bpo->bpo_object, offset,
229 			    FTAG, &dbuf, 0);
230 			if (err)
231 				break;
232 		}
233 
234 		ASSERT3U(offset, >=, dbuf->db_offset);
235 		ASSERT3U(offset, <, dbuf->db_offset + dbuf->db_size);
236 
237 		bparray = dbuf->db_data;
238 		bp = &bparray[blkoff];
239 		err = func(arg, bp, tx);
240 		if (err)
241 			break;
242 		if (free) {
243 			bpo->bpo_phys->bpo_bytes -=
244 			    bp_get_dsize_sync(dmu_objset_spa(bpo->bpo_os), bp);
245 			ASSERT3S(bpo->bpo_phys->bpo_bytes, >=, 0);
246 			if (bpo->bpo_havecomp) {
247 				bpo->bpo_phys->bpo_comp -= BP_GET_PSIZE(bp);
248 				bpo->bpo_phys->bpo_uncomp -= BP_GET_UCSIZE(bp);
249 			}
250 			bpo->bpo_phys->bpo_num_blkptrs--;
251 			ASSERT3S(bpo->bpo_phys->bpo_num_blkptrs, >=, 0);
252 		}
253 	}
254 	if (dbuf) {
255 		dmu_buf_rele(dbuf, FTAG);
256 		dbuf = NULL;
257 	}
258 	if (free) {
259 		i++;
260 		VERIFY3U(0, ==, dmu_free_range(bpo->bpo_os, bpo->bpo_object,
261 		    i * sizeof (blkptr_t), -1ULL, tx));
262 	}
263 	if (err || !bpo->bpo_havesubobj || bpo->bpo_phys->bpo_subobjs == 0)
264 		goto out;
265 
266 	ASSERT(bpo->bpo_havecomp);
267 	err = dmu_object_info(bpo->bpo_os, bpo->bpo_phys->bpo_subobjs, &doi);
268 	if (err) {
269 		mutex_exit(&bpo->bpo_lock);
270 		return (err);
271 	}
272 	ASSERT3U(doi.doi_type, ==, DMU_OT_BPOBJ_SUBOBJ);
273 	epb = doi.doi_data_block_size / sizeof (uint64_t);
274 
275 	for (i = bpo->bpo_phys->bpo_num_subobjs - 1; i >= 0; i--) {
276 		uint64_t *objarray;
277 		uint64_t offset, blkoff;
278 		bpobj_t sublist;
279 		uint64_t used_before, comp_before, uncomp_before;
280 		uint64_t used_after, comp_after, uncomp_after;
281 
282 		offset = i * sizeof (uint64_t);
283 		blkoff = P2PHASE(i, epb);
284 
285 		if (dbuf == NULL || dbuf->db_offset > offset) {
286 			if (dbuf)
287 				dmu_buf_rele(dbuf, FTAG);
288 			err = dmu_buf_hold(bpo->bpo_os,
289 			    bpo->bpo_phys->bpo_subobjs, offset, FTAG, &dbuf, 0);
290 			if (err)
291 				break;
292 		}
293 
294 		ASSERT3U(offset, >=, dbuf->db_offset);
295 		ASSERT3U(offset, <, dbuf->db_offset + dbuf->db_size);
296 
297 		objarray = dbuf->db_data;
298 		err = bpobj_open(&sublist, bpo->bpo_os, objarray[blkoff]);
299 		if (err)
300 			break;
301 		if (free) {
302 			err = bpobj_space(&sublist,
303 			    &used_before, &comp_before, &uncomp_before);
304 			if (err)
305 				break;
306 		}
307 		err = bpobj_iterate_impl(&sublist, func, arg, tx, free);
308 		if (free) {
309 			VERIFY3U(0, ==, bpobj_space(&sublist,
310 			    &used_after, &comp_after, &uncomp_after));
311 			bpo->bpo_phys->bpo_bytes -= used_before - used_after;
312 			ASSERT3S(bpo->bpo_phys->bpo_bytes, >=, 0);
313 			bpo->bpo_phys->bpo_comp -= comp_before - comp_after;
314 			bpo->bpo_phys->bpo_uncomp -=
315 			    uncomp_before - uncomp_after;
316 		}
317 
318 		bpobj_close(&sublist);
319 		if (err)
320 			break;
321 		if (free) {
322 			err = dmu_object_free(bpo->bpo_os,
323 			    objarray[blkoff], tx);
324 			if (err)
325 				break;
326 			bpo->bpo_phys->bpo_num_subobjs--;
327 			ASSERT3S(bpo->bpo_phys->bpo_num_subobjs, >=, 0);
328 		}
329 	}
330 	if (dbuf) {
331 		dmu_buf_rele(dbuf, FTAG);
332 		dbuf = NULL;
333 	}
334 	if (free) {
335 		VERIFY3U(0, ==, dmu_free_range(bpo->bpo_os,
336 		    bpo->bpo_phys->bpo_subobjs,
337 		    (i + 1) * sizeof (uint64_t), -1ULL, tx));
338 	}
339 
340 out:
341 	/* If there are no entries, there should be no bytes. */
342 	if (!bpobj_hasentries(bpo)) {
343 		ASSERT0(bpo->bpo_phys->bpo_bytes);
344 		ASSERT0(bpo->bpo_phys->bpo_comp);
345 		ASSERT0(bpo->bpo_phys->bpo_uncomp);
346 	}
347 
348 	mutex_exit(&bpo->bpo_lock);
349 	return (err);
350 }
351 
352 /*
353  * Iterate and remove the entries.  If func returns nonzero, iteration
354  * will stop and that entry will not be removed.
355  */
356 int
357 bpobj_iterate(bpobj_t *bpo, bpobj_itor_t func, void *arg, dmu_tx_t *tx)
358 {
359 	return (bpobj_iterate_impl(bpo, func, arg, tx, B_TRUE));
360 }
361 
362 /*
363  * Iterate the entries.  If func returns nonzero, iteration will stop.
364  */
365 int
366 bpobj_iterate_nofree(bpobj_t *bpo, bpobj_itor_t func, void *arg, dmu_tx_t *tx)
367 {
368 	return (bpobj_iterate_impl(bpo, func, arg, tx, B_FALSE));
369 }
370 
371 void
372 bpobj_enqueue_subobj(bpobj_t *bpo, uint64_t subobj, dmu_tx_t *tx)
373 {
374 	bpobj_t subbpo;
375 	uint64_t used, comp, uncomp, subsubobjs;
376 
377 	ASSERT(bpo->bpo_havesubobj);
378 	ASSERT(bpo->bpo_havecomp);
379 	ASSERT(bpo->bpo_object != dmu_objset_pool(bpo->bpo_os)->dp_empty_bpobj);
380 
381 	if (subobj == dmu_objset_pool(bpo->bpo_os)->dp_empty_bpobj) {
382 		bpobj_decr_empty(bpo->bpo_os, tx);
383 		return;
384 	}
385 
386 	VERIFY3U(0, ==, bpobj_open(&subbpo, bpo->bpo_os, subobj));
387 	VERIFY3U(0, ==, bpobj_space(&subbpo, &used, &comp, &uncomp));
388 
389 	if (!bpobj_hasentries(&subbpo)) {
390 		/* No point in having an empty subobj. */
391 		bpobj_close(&subbpo);
392 		bpobj_free(bpo->bpo_os, subobj, tx);
393 		return;
394 	}
395 
396 	dmu_buf_will_dirty(bpo->bpo_dbuf, tx);
397 	if (bpo->bpo_phys->bpo_subobjs == 0) {
398 		bpo->bpo_phys->bpo_subobjs = dmu_object_alloc(bpo->bpo_os,
399 		    DMU_OT_BPOBJ_SUBOBJ, SPA_MAXBLOCKSIZE, DMU_OT_NONE, 0, tx);
400 	}
401 
402 	dmu_object_info_t doi;
403 	ASSERT0(dmu_object_info(bpo->bpo_os, bpo->bpo_phys->bpo_subobjs, &doi));
404 	ASSERT3U(doi.doi_type, ==, DMU_OT_BPOBJ_SUBOBJ);
405 
406 	mutex_enter(&bpo->bpo_lock);
407 	dmu_write(bpo->bpo_os, bpo->bpo_phys->bpo_subobjs,
408 	    bpo->bpo_phys->bpo_num_subobjs * sizeof (subobj),
409 	    sizeof (subobj), &subobj, tx);
410 	bpo->bpo_phys->bpo_num_subobjs++;
411 
412 	/*
413 	 * If subobj has only one block of subobjs, then move subobj's
414 	 * subobjs to bpo's subobj list directly.  This reduces
415 	 * recursion in bpobj_iterate due to nested subobjs.
416 	 */
417 	subsubobjs = subbpo.bpo_phys->bpo_subobjs;
418 	if (subsubobjs != 0) {
419 		dmu_object_info_t doi;
420 
421 		VERIFY3U(0, ==, dmu_object_info(bpo->bpo_os, subsubobjs, &doi));
422 		if (doi.doi_max_offset == doi.doi_data_block_size) {
423 			dmu_buf_t *subdb;
424 			uint64_t numsubsub = subbpo.bpo_phys->bpo_num_subobjs;
425 
426 			VERIFY3U(0, ==, dmu_buf_hold(bpo->bpo_os, subsubobjs,
427 			    0, FTAG, &subdb, 0));
428 			/*
429 			 * Make sure that we are not asking dmu_write()
430 			 * to write more data than we have in our buffer.
431 			 */
432 			VERIFY3U(subdb->db_size, >=,
433 			    numsubsub * sizeof (subobj));
434 			dmu_write(bpo->bpo_os, bpo->bpo_phys->bpo_subobjs,
435 			    bpo->bpo_phys->bpo_num_subobjs * sizeof (subobj),
436 			    numsubsub * sizeof (subobj), subdb->db_data, tx);
437 			dmu_buf_rele(subdb, FTAG);
438 			bpo->bpo_phys->bpo_num_subobjs += numsubsub;
439 
440 			dmu_buf_will_dirty(subbpo.bpo_dbuf, tx);
441 			subbpo.bpo_phys->bpo_subobjs = 0;
442 			VERIFY3U(0, ==, dmu_object_free(bpo->bpo_os,
443 			    subsubobjs, tx));
444 		}
445 	}
446 	bpo->bpo_phys->bpo_bytes += used;
447 	bpo->bpo_phys->bpo_comp += comp;
448 	bpo->bpo_phys->bpo_uncomp += uncomp;
449 	mutex_exit(&bpo->bpo_lock);
450 
451 	bpobj_close(&subbpo);
452 }
453 
454 void
455 bpobj_enqueue(bpobj_t *bpo, const blkptr_t *bp, dmu_tx_t *tx)
456 {
457 	blkptr_t stored_bp = *bp;
458 	uint64_t offset;
459 	int blkoff;
460 	blkptr_t *bparray;
461 
462 	ASSERT(!BP_IS_HOLE(bp));
463 	ASSERT(bpo->bpo_object != dmu_objset_pool(bpo->bpo_os)->dp_empty_bpobj);
464 
465 	if (BP_IS_EMBEDDED(bp)) {
466 		/*
467 		 * The bpobj will compress better without the payload.
468 		 *
469 		 * Note that we store EMBEDDED bp's because they have an
470 		 * uncompressed size, which must be accounted for.  An
471 		 * alternative would be to add their size to bpo_uncomp
472 		 * without storing the bp, but that would create additional
473 		 * complications: bpo_uncomp would be inconsistent with the
474 		 * set of BP's stored, and bpobj_iterate() wouldn't visit
475 		 * all the space accounted for in the bpobj.
476 		 */
477 		bzero(&stored_bp, sizeof (stored_bp));
478 		stored_bp.blk_prop = bp->blk_prop;
479 		stored_bp.blk_birth = bp->blk_birth;
480 	} else if (!BP_GET_DEDUP(bp)) {
481 		/* The bpobj will compress better without the checksum */
482 		bzero(&stored_bp.blk_cksum, sizeof (stored_bp.blk_cksum));
483 	}
484 
485 	/* We never need the fill count. */
486 	stored_bp.blk_fill = 0;
487 
488 	mutex_enter(&bpo->bpo_lock);
489 
490 	offset = bpo->bpo_phys->bpo_num_blkptrs * sizeof (stored_bp);
491 	blkoff = P2PHASE(bpo->bpo_phys->bpo_num_blkptrs, bpo->bpo_epb);
492 
493 	if (bpo->bpo_cached_dbuf == NULL ||
494 	    offset < bpo->bpo_cached_dbuf->db_offset ||
495 	    offset >= bpo->bpo_cached_dbuf->db_offset +
496 	    bpo->bpo_cached_dbuf->db_size) {
497 		if (bpo->bpo_cached_dbuf)
498 			dmu_buf_rele(bpo->bpo_cached_dbuf, bpo);
499 		VERIFY3U(0, ==, dmu_buf_hold(bpo->bpo_os, bpo->bpo_object,
500 		    offset, bpo, &bpo->bpo_cached_dbuf, 0));
501 	}
502 
503 	dmu_buf_will_dirty(bpo->bpo_cached_dbuf, tx);
504 	bparray = bpo->bpo_cached_dbuf->db_data;
505 	bparray[blkoff] = stored_bp;
506 
507 	dmu_buf_will_dirty(bpo->bpo_dbuf, tx);
508 	bpo->bpo_phys->bpo_num_blkptrs++;
509 	bpo->bpo_phys->bpo_bytes +=
510 	    bp_get_dsize_sync(dmu_objset_spa(bpo->bpo_os), bp);
511 	if (bpo->bpo_havecomp) {
512 		bpo->bpo_phys->bpo_comp += BP_GET_PSIZE(bp);
513 		bpo->bpo_phys->bpo_uncomp += BP_GET_UCSIZE(bp);
514 	}
515 	mutex_exit(&bpo->bpo_lock);
516 }
517 
518 struct space_range_arg {
519 	spa_t *spa;
520 	uint64_t mintxg;
521 	uint64_t maxtxg;
522 	uint64_t used;
523 	uint64_t comp;
524 	uint64_t uncomp;
525 };
526 
527 /* ARGSUSED */
528 static int
529 space_range_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx)
530 {
531 	struct space_range_arg *sra = arg;
532 
533 	if (bp->blk_birth > sra->mintxg && bp->blk_birth <= sra->maxtxg) {
534 		if (dsl_pool_sync_context(spa_get_dsl(sra->spa)))
535 			sra->used += bp_get_dsize_sync(sra->spa, bp);
536 		else
537 			sra->used += bp_get_dsize(sra->spa, bp);
538 		sra->comp += BP_GET_PSIZE(bp);
539 		sra->uncomp += BP_GET_UCSIZE(bp);
540 	}
541 	return (0);
542 }
543 
544 int
545 bpobj_space(bpobj_t *bpo, uint64_t *usedp, uint64_t *compp, uint64_t *uncompp)
546 {
547 	mutex_enter(&bpo->bpo_lock);
548 
549 	*usedp = bpo->bpo_phys->bpo_bytes;
550 	if (bpo->bpo_havecomp) {
551 		*compp = bpo->bpo_phys->bpo_comp;
552 		*uncompp = bpo->bpo_phys->bpo_uncomp;
553 		mutex_exit(&bpo->bpo_lock);
554 		return (0);
555 	} else {
556 		mutex_exit(&bpo->bpo_lock);
557 		return (bpobj_space_range(bpo, 0, UINT64_MAX,
558 		    usedp, compp, uncompp));
559 	}
560 }
561 
562 /*
563  * Return the amount of space in the bpobj which is:
564  * mintxg < blk_birth <= maxtxg
565  */
566 int
567 bpobj_space_range(bpobj_t *bpo, uint64_t mintxg, uint64_t maxtxg,
568     uint64_t *usedp, uint64_t *compp, uint64_t *uncompp)
569 {
570 	struct space_range_arg sra = { 0 };
571 	int err;
572 
573 	/*
574 	 * As an optimization, if they want the whole txg range, just
575 	 * get bpo_bytes rather than iterating over the bps.
576 	 */
577 	if (mintxg < TXG_INITIAL && maxtxg == UINT64_MAX && bpo->bpo_havecomp)
578 		return (bpobj_space(bpo, usedp, compp, uncompp));
579 
580 	sra.spa = dmu_objset_spa(bpo->bpo_os);
581 	sra.mintxg = mintxg;
582 	sra.maxtxg = maxtxg;
583 
584 	err = bpobj_iterate_nofree(bpo, space_range_cb, &sra, NULL);
585 	*usedp = sra.used;
586 	*compp = sra.comp;
587 	*uncompp = sra.uncomp;
588 	return (err);
589 }
590