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 }