xref: /titanic_41/usr/src/uts/common/fs/zfs/bpobj.c (revision ae240eb822cbf8b22955d3c6f3facf160df9e04a) 
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, 2014 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_OLD_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 		VERIFY3U(0, ==, dmu_free_range(bpo->bpo_os, bpo->bpo_object,
260 		    (i + 1) * sizeof (blkptr_t), -1ULL, tx));
261 	}
262 	if (err || !bpo->bpo_havesubobj || bpo->bpo_phys->bpo_subobjs == 0)
263 		goto out;
264 
265 	ASSERT(bpo->bpo_havecomp);
266 	err = dmu_object_info(bpo->bpo_os, bpo->bpo_phys->bpo_subobjs, &doi);
267 	if (err) {
268 		mutex_exit(&bpo->bpo_lock);
269 		return (err);
270 	}
271 	ASSERT3U(doi.doi_type, ==, DMU_OT_BPOBJ_SUBOBJ);
272 	epb = doi.doi_data_block_size / sizeof (uint64_t);
273 
274 	for (i = bpo->bpo_phys->bpo_num_subobjs - 1; i >= 0; i--) {
275 		uint64_t *objarray;
276 		uint64_t offset, blkoff;
277 		bpobj_t sublist;
278 		uint64_t used_before, comp_before, uncomp_before;
279 		uint64_t used_after, comp_after, uncomp_after;
280 
281 		offset = i * sizeof (uint64_t);
282 		blkoff = P2PHASE(i, epb);
283 
284 		if (dbuf == NULL || dbuf->db_offset > offset) {
285 			if (dbuf)
286 				dmu_buf_rele(dbuf, FTAG);
287 			err = dmu_buf_hold(bpo->bpo_os,
288 			    bpo->bpo_phys->bpo_subobjs, offset, FTAG, &dbuf, 0);
289 			if (err)
290 				break;
291 		}
292 
293 		ASSERT3U(offset, >=, dbuf->db_offset);
294 		ASSERT3U(offset, <, dbuf->db_offset + dbuf->db_size);
295 
296 		objarray = dbuf->db_data;
297 		err = bpobj_open(&sublist, bpo->bpo_os, objarray[blkoff]);
298 		if (err)
299 			break;
300 		if (free) {
301 			err = bpobj_space(&sublist,
302 			    &used_before, &comp_before, &uncomp_before);
303 			if (err != 0) {
304 				bpobj_close(&sublist);
305 				break;
306 			}
307 		}
308 		err = bpobj_iterate_impl(&sublist, func, arg, tx, free);
309 		if (free) {
310 			VERIFY3U(0, ==, bpobj_space(&sublist,
311 			    &used_after, &comp_after, &uncomp_after));
312 			bpo->bpo_phys->bpo_bytes -= used_before - used_after;
313 			ASSERT3S(bpo->bpo_phys->bpo_bytes, >=, 0);
314 			bpo->bpo_phys->bpo_comp -= comp_before - comp_after;
315 			bpo->bpo_phys->bpo_uncomp -=
316 			    uncomp_before - uncomp_after;
317 		}
318 
319 		bpobj_close(&sublist);
320 		if (err)
321 			break;
322 		if (free) {
323 			err = dmu_object_free(bpo->bpo_os,
324 			    objarray[blkoff], tx);
325 			if (err)
326 				break;
327 			bpo->bpo_phys->bpo_num_subobjs--;
328 			ASSERT3S(bpo->bpo_phys->bpo_num_subobjs, >=, 0);
329 		}
330 	}
331 	if (dbuf) {
332 		dmu_buf_rele(dbuf, FTAG);
333 		dbuf = NULL;
334 	}
335 	if (free) {
336 		VERIFY3U(0, ==, dmu_free_range(bpo->bpo_os,
337 		    bpo->bpo_phys->bpo_subobjs,
338 		    (i + 1) * sizeof (uint64_t), -1ULL, tx));
339 	}
340 
341 out:
342 	/* If there are no entries, there should be no bytes. */
343 	if (!bpobj_hasentries(bpo)) {
344 		ASSERT0(bpo->bpo_phys->bpo_bytes);
345 		ASSERT0(bpo->bpo_phys->bpo_comp);
346 		ASSERT0(bpo->bpo_phys->bpo_uncomp);
347 	}
348 
349 	mutex_exit(&bpo->bpo_lock);
350 	return (err);
351 }
352 
353 /*
354  * Iterate and remove the entries.  If func returns nonzero, iteration
355  * will stop and that entry will not be removed.
356  */
357 int
358 bpobj_iterate(bpobj_t *bpo, bpobj_itor_t func, void *arg, dmu_tx_t *tx)
359 {
360 	return (bpobj_iterate_impl(bpo, func, arg, tx, B_TRUE));
361 }
362 
363 /*
364  * Iterate the entries.  If func returns nonzero, iteration will stop.
365  */
366 int
367 bpobj_iterate_nofree(bpobj_t *bpo, bpobj_itor_t func, void *arg, dmu_tx_t *tx)
368 {
369 	return (bpobj_iterate_impl(bpo, func, arg, tx, B_FALSE));
370 }
371 
372 void
373 bpobj_enqueue_subobj(bpobj_t *bpo, uint64_t subobj, dmu_tx_t *tx)
374 {
375 	bpobj_t subbpo;
376 	uint64_t used, comp, uncomp, subsubobjs;
377 
378 	ASSERT(bpo->bpo_havesubobj);
379 	ASSERT(bpo->bpo_havecomp);
380 	ASSERT(bpo->bpo_object != dmu_objset_pool(bpo->bpo_os)->dp_empty_bpobj);
381 
382 	if (subobj == dmu_objset_pool(bpo->bpo_os)->dp_empty_bpobj) {
383 		bpobj_decr_empty(bpo->bpo_os, tx);
384 		return;
385 	}
386 
387 	VERIFY3U(0, ==, bpobj_open(&subbpo, bpo->bpo_os, subobj));
388 	VERIFY3U(0, ==, bpobj_space(&subbpo, &used, &comp, &uncomp));
389 
390 	if (!bpobj_hasentries(&subbpo)) {
391 		/* No point in having an empty subobj. */
392 		bpobj_close(&subbpo);
393 		bpobj_free(bpo->bpo_os, subobj, tx);
394 		return;
395 	}
396 
397 	dmu_buf_will_dirty(bpo->bpo_dbuf, tx);
398 	if (bpo->bpo_phys->bpo_subobjs == 0) {
399 		bpo->bpo_phys->bpo_subobjs = dmu_object_alloc(bpo->bpo_os,
400 		    DMU_OT_BPOBJ_SUBOBJ, SPA_OLD_MAXBLOCKSIZE,
401 		    DMU_OT_NONE, 0, tx);
402 	}
403 
404 	dmu_object_info_t doi;
405 	ASSERT0(dmu_object_info(bpo->bpo_os, bpo->bpo_phys->bpo_subobjs, &doi));
406 	ASSERT3U(doi.doi_type, ==, DMU_OT_BPOBJ_SUBOBJ);
407 
408 	mutex_enter(&bpo->bpo_lock);
409 	dmu_write(bpo->bpo_os, bpo->bpo_phys->bpo_subobjs,
410 	    bpo->bpo_phys->bpo_num_subobjs * sizeof (subobj),
411 	    sizeof (subobj), &subobj, tx);
412 	bpo->bpo_phys->bpo_num_subobjs++;
413 
414 	/*
415 	 * If subobj has only one block of subobjs, then move subobj's
416 	 * subobjs to bpo's subobj list directly.  This reduces
417 	 * recursion in bpobj_iterate due to nested subobjs.
418 	 */
419 	subsubobjs = subbpo.bpo_phys->bpo_subobjs;
420 	if (subsubobjs != 0) {
421 		dmu_object_info_t doi;
422 
423 		VERIFY3U(0, ==, dmu_object_info(bpo->bpo_os, subsubobjs, &doi));
424 		if (doi.doi_max_offset == doi.doi_data_block_size) {
425 			dmu_buf_t *subdb;
426 			uint64_t numsubsub = subbpo.bpo_phys->bpo_num_subobjs;
427 
428 			VERIFY3U(0, ==, dmu_buf_hold(bpo->bpo_os, subsubobjs,
429 			    0, FTAG, &subdb, 0));
430 			/*
431 			 * Make sure that we are not asking dmu_write()
432 			 * to write more data than we have in our buffer.
433 			 */
434 			VERIFY3U(subdb->db_size, >=,
435 			    numsubsub * sizeof (subobj));
436 			dmu_write(bpo->bpo_os, bpo->bpo_phys->bpo_subobjs,
437 			    bpo->bpo_phys->bpo_num_subobjs * sizeof (subobj),
438 			    numsubsub * sizeof (subobj), subdb->db_data, tx);
439 			dmu_buf_rele(subdb, FTAG);
440 			bpo->bpo_phys->bpo_num_subobjs += numsubsub;
441 
442 			dmu_buf_will_dirty(subbpo.bpo_dbuf, tx);
443 			subbpo.bpo_phys->bpo_subobjs = 0;
444 			VERIFY3U(0, ==, dmu_object_free(bpo->bpo_os,
445 			    subsubobjs, tx));
446 		}
447 	}
448 	bpo->bpo_phys->bpo_bytes += used;
449 	bpo->bpo_phys->bpo_comp += comp;
450 	bpo->bpo_phys->bpo_uncomp += uncomp;
451 	mutex_exit(&bpo->bpo_lock);
452 
453 	bpobj_close(&subbpo);
454 }
455 
456 void
457 bpobj_enqueue(bpobj_t *bpo, const blkptr_t *bp, dmu_tx_t *tx)
458 {
459 	blkptr_t stored_bp = *bp;
460 	uint64_t offset;
461 	int blkoff;
462 	blkptr_t *bparray;
463 
464 	ASSERT(!BP_IS_HOLE(bp));
465 	ASSERT(bpo->bpo_object != dmu_objset_pool(bpo->bpo_os)->dp_empty_bpobj);
466 
467 	if (BP_IS_EMBEDDED(bp)) {
468 		/*
469 		 * The bpobj will compress better without the payload.
470 		 *
471 		 * Note that we store EMBEDDED bp's because they have an
472 		 * uncompressed size, which must be accounted for.  An
473 		 * alternative would be to add their size to bpo_uncomp
474 		 * without storing the bp, but that would create additional
475 		 * complications: bpo_uncomp would be inconsistent with the
476 		 * set of BP's stored, and bpobj_iterate() wouldn't visit
477 		 * all the space accounted for in the bpobj.
478 		 */
479 		bzero(&stored_bp, sizeof (stored_bp));
480 		stored_bp.blk_prop = bp->blk_prop;
481 		stored_bp.blk_birth = bp->blk_birth;
482 	} else if (!BP_GET_DEDUP(bp)) {
483 		/* The bpobj will compress better without the checksum */
484 		bzero(&stored_bp.blk_cksum, sizeof (stored_bp.blk_cksum));
485 	}
486 
487 	/* We never need the fill count. */
488 	stored_bp.blk_fill = 0;
489 
490 	mutex_enter(&bpo->bpo_lock);
491 
492 	offset = bpo->bpo_phys->bpo_num_blkptrs * sizeof (stored_bp);
493 	blkoff = P2PHASE(bpo->bpo_phys->bpo_num_blkptrs, bpo->bpo_epb);
494 
495 	if (bpo->bpo_cached_dbuf == NULL ||
496 	    offset < bpo->bpo_cached_dbuf->db_offset ||
497 	    offset >= bpo->bpo_cached_dbuf->db_offset +
498 	    bpo->bpo_cached_dbuf->db_size) {
499 		if (bpo->bpo_cached_dbuf)
500 			dmu_buf_rele(bpo->bpo_cached_dbuf, bpo);
501 		VERIFY3U(0, ==, dmu_buf_hold(bpo->bpo_os, bpo->bpo_object,
502 		    offset, bpo, &bpo->bpo_cached_dbuf, 0));
503 	}
504 
505 	dmu_buf_will_dirty(bpo->bpo_cached_dbuf, tx);
506 	bparray = bpo->bpo_cached_dbuf->db_data;
507 	bparray[blkoff] = stored_bp;
508 
509 	dmu_buf_will_dirty(bpo->bpo_dbuf, tx);
510 	bpo->bpo_phys->bpo_num_blkptrs++;
511 	bpo->bpo_phys->bpo_bytes +=
512 	    bp_get_dsize_sync(dmu_objset_spa(bpo->bpo_os), bp);
513 	if (bpo->bpo_havecomp) {
514 		bpo->bpo_phys->bpo_comp += BP_GET_PSIZE(bp);
515 		bpo->bpo_phys->bpo_uncomp += BP_GET_UCSIZE(bp);
516 	}
517 	mutex_exit(&bpo->bpo_lock);
518 }
519 
520 struct space_range_arg {
521 	spa_t *spa;
522 	uint64_t mintxg;
523 	uint64_t maxtxg;
524 	uint64_t used;
525 	uint64_t comp;
526 	uint64_t uncomp;
527 };
528 
529 /* ARGSUSED */
530 static int
531 space_range_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx)
532 {
533 	struct space_range_arg *sra = arg;
534 
535 	if (bp->blk_birth > sra->mintxg && bp->blk_birth <= sra->maxtxg) {
536 		if (dsl_pool_sync_context(spa_get_dsl(sra->spa)))
537 			sra->used += bp_get_dsize_sync(sra->spa, bp);
538 		else
539 			sra->used += bp_get_dsize(sra->spa, bp);
540 		sra->comp += BP_GET_PSIZE(bp);
541 		sra->uncomp += BP_GET_UCSIZE(bp);
542 	}
543 	return (0);
544 }
545 
546 int
547 bpobj_space(bpobj_t *bpo, uint64_t *usedp, uint64_t *compp, uint64_t *uncompp)
548 {
549 	mutex_enter(&bpo->bpo_lock);
550 
551 	*usedp = bpo->bpo_phys->bpo_bytes;
552 	if (bpo->bpo_havecomp) {
553 		*compp = bpo->bpo_phys->bpo_comp;
554 		*uncompp = bpo->bpo_phys->bpo_uncomp;
555 		mutex_exit(&bpo->bpo_lock);
556 		return (0);
557 	} else {
558 		mutex_exit(&bpo->bpo_lock);
559 		return (bpobj_space_range(bpo, 0, UINT64_MAX,
560 		    usedp, compp, uncompp));
561 	}
562 }
563 
564 /*
565  * Return the amount of space in the bpobj which is:
566  * mintxg < blk_birth <= maxtxg
567  */
568 int
569 bpobj_space_range(bpobj_t *bpo, uint64_t mintxg, uint64_t maxtxg,
570     uint64_t *usedp, uint64_t *compp, uint64_t *uncompp)
571 {
572 	struct space_range_arg sra = { 0 };
573 	int err;
574 
575 	/*
576 	 * As an optimization, if they want the whole txg range, just
577 	 * get bpo_bytes rather than iterating over the bps.
578 	 */
579 	if (mintxg < TXG_INITIAL && maxtxg == UINT64_MAX && bpo->bpo_havecomp)
580 		return (bpobj_space(bpo, usedp, compp, uncompp));
581 
582 	sra.spa = dmu_objset_spa(bpo->bpo_os);
583 	sra.mintxg = mintxg;
584 	sra.maxtxg = maxtxg;
585 
586 	err = bpobj_iterate_nofree(bpo, space_range_cb, &sra, NULL);
587 	*usedp = sra.used;
588 	*compp = sra.comp;
589 	*uncompp = sra.uncomp;
590 	return (err);
591 }
592