sys/cddl/contrib/opensolaris/uts/common/fs/zfs/bpobj.c

   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 int
 196 bpobj_iterate_impl(bpobj_t *bpo, bpobj_itor_t func, void *arg, dmu_tx_t *tx,
 197     boolean_t free)
 198 {
 199         dmu_object_info_t doi;
 200         int epb;
 201         int64_t i;
 202         int err = 0;
 203         dmu_buf_t *dbuf = NULL;
 204
 205         mutex_enter(&bpo->bpo_lock);
 206
 207         if (free)
 208                 dmu_buf_will_dirty(bpo->bpo_dbuf, tx);
 209
 210         for (i = bpo->bpo_phys->bpo_num_blkptrs - 1; i >= 0; i--) {
 211                 blkptr_t *bparray;
 212                 blkptr_t *bp;
 213                 uint64_t offset, blkoff;
 214
 215                 offset = i * sizeof (blkptr_t);
 216                 blkoff = P2PHASE(i, bpo->bpo_epb);
 217
 218                 if (dbuf == NULL || dbuf->db_offset > offset) {
 219                         if (dbuf)
 220                                 dmu_buf_rele(dbuf, FTAG);
 221                         err = dmu_buf_hold(bpo->bpo_os, bpo->bpo_object, offset,
 222                             FTAG, &dbuf, 0);
 223                         if (err)
 224                                 break;
 225                 }
 226
 227                 ASSERT3U(offset, >=, dbuf->db_offset);
 228                 ASSERT3U(offset, <, dbuf->db_offset + dbuf->db_size);
 229
 230                 bparray = dbuf->db_data;
 231                 bp = &bparray[blkoff];
 232                 err = func(arg, bp, tx);
 233                 if (err)
 234                         break;
 235                 if (free) {
 236                         bpo->bpo_phys->bpo_bytes -=
 237                             bp_get_dsize_sync(dmu_objset_spa(bpo->bpo_os), bp);
 238                         ASSERT3S(bpo->bpo_phys->bpo_bytes, >=, 0);
 239                         if (bpo->bpo_havecomp) {
 240                                 bpo->bpo_phys->bpo_comp -= BP_GET_PSIZE(bp);
 241                                 bpo->bpo_phys->bpo_uncomp -= BP_GET_UCSIZE(bp);
 242                         }
 243                         bpo->bpo_phys->bpo_num_blkptrs--;
 244                         ASSERT3S(bpo->bpo_phys->bpo_num_blkptrs, >=, 0);
 245                 }
 246         }
 247         if (dbuf) {
 248                 dmu_buf_rele(dbuf, FTAG);
 249                 dbuf = NULL;
 250         }
 251         if (free) {
 252                 i++;
 253                 VERIFY3U(0, ==, dmu_free_range(bpo->bpo_os, bpo->bpo_object,
 254                     i * sizeof (blkptr_t), -1ULL, tx));
 255         }
 256         if (err || !bpo->bpo_havesubobj || bpo->bpo_phys->bpo_subobjs == 0)
 257                 goto out;
 258
 259         ASSERT(bpo->bpo_havecomp);
 260         err = dmu_object_info(bpo->bpo_os, bpo->bpo_phys->bpo_subobjs, &doi);
 261         if (err) {
 262                 mutex_exit(&bpo->bpo_lock);
 263                 return (err);
 264         }
 265         ASSERT3U(doi.doi_type, ==, DMU_OT_BPOBJ_SUBOBJ);
 266         epb = doi.doi_data_block_size / sizeof (uint64_t);
 267
 268         for (i = bpo->bpo_phys->bpo_num_subobjs - 1; i >= 0; i--) {
 269                 uint64_t *objarray;
 270                 uint64_t offset, blkoff;
 271                 bpobj_t sublist;
 272                 uint64_t used_before, comp_before, uncomp_before;
 273                 uint64_t used_after, comp_after, uncomp_after;
 274
 275                 offset = i * sizeof (uint64_t);
 276                 blkoff = P2PHASE(i, epb);
 277
 278                 if (dbuf == NULL || dbuf->db_offset > offset) {
 279                         if (dbuf)
 280                                 dmu_buf_rele(dbuf, FTAG);
 281                         err = dmu_buf_hold(bpo->bpo_os,
 282                             bpo->bpo_phys->bpo_subobjs, offset, FTAG, &dbuf, 0);
 283                         if (err)
 284                                 break;
 285                 }
 286
 287                 ASSERT3U(offset, >=, dbuf->db_offset);
 288                 ASSERT3U(offset, <, dbuf->db_offset + dbuf->db_size);
 289
 290                 objarray = dbuf->db_data;
 291                 err = bpobj_open(&sublist, bpo->bpo_os, objarray[blkoff]);
 292                 if (err)
 293                         break;
 294                 if (free) {
 295                         err = bpobj_space(&sublist,
 296                             &used_before, &comp_before, &uncomp_before);
 297                         if (err)
 298                                 break;
 299                 }
 300                 err = bpobj_iterate_impl(&sublist, func, arg, tx, free);
 301                 if (free) {
 302                         VERIFY3U(0, ==, bpobj_space(&sublist,
 303                             &used_after, &comp_after, &uncomp_after));
 304                         bpo->bpo_phys->bpo_bytes -= used_before - used_after;
 305                         ASSERT3S(bpo->bpo_phys->bpo_bytes, >=, 0);
 306                         bpo->bpo_phys->bpo_comp -= comp_before - comp_after;
 307                         bpo->bpo_phys->bpo_uncomp -=
 308                             uncomp_before - uncomp_after;
 309                 }
 310
 311                 bpobj_close(&sublist);
 312                 if (err)
 313                         break;
 314                 if (free) {
 315                         err = dmu_object_free(bpo->bpo_os,
 316                             objarray[blkoff], tx);
 317                         if (err)
 318                                 break;
 319                         bpo->bpo_phys->bpo_num_subobjs--;
 320                         ASSERT3S(bpo->bpo_phys->bpo_num_subobjs, >=, 0);
 321                 }
 322         }
 323         if (dbuf) {
 324                 dmu_buf_rele(dbuf, FTAG);
 325                 dbuf = NULL;
 326         }
 327         if (free) {
 328                 VERIFY3U(0, ==, dmu_free_range(bpo->bpo_os,
 329                     bpo->bpo_phys->bpo_subobjs,
 330                     (i + 1) * sizeof (uint64_t), -1ULL, tx));
 331         }
 332
 333 out:
 334         /* If there are no entries, there should be no bytes. */
 335         ASSERT(bpo->bpo_phys->bpo_num_blkptrs > 0 ||
 336             (bpo->bpo_havesubobj && bpo->bpo_phys->bpo_num_subobjs > 0) ||
 337             bpo->bpo_phys->bpo_bytes == 0);
 338
 339         mutex_exit(&bpo->bpo_lock);
 340         return (err);
 341 }
 342
 343 /*
 344  * Iterate and remove the entries.  If func returns nonzero, iteration
 345  * will stop and that entry will not be removed.
 346  */
 347 int
 348 bpobj_iterate(bpobj_t *bpo, bpobj_itor_t func, void *arg, dmu_tx_t *tx)
 349 {
 350         return (bpobj_iterate_impl(bpo, func, arg, tx, B_TRUE));
 351 }
 352
 353 /*
 354  * Iterate the entries.  If func returns nonzero, iteration will stop.
 355  */
 356 int
 357 bpobj_iterate_nofree(bpobj_t *bpo, bpobj_itor_t func, void *arg, dmu_tx_t *tx)
 358 {
 359         return (bpobj_iterate_impl(bpo, func, arg, tx, B_FALSE));
 360 }
 361
 362 void
 363 bpobj_enqueue_subobj(bpobj_t *bpo, uint64_t subobj, dmu_tx_t *tx)
 364 {
 365         bpobj_t subbpo;
 366         uint64_t used, comp, uncomp, subsubobjs;
 367
 368         ASSERT(bpo->bpo_havesubobj);
 369         ASSERT(bpo->bpo_havecomp);
 370         ASSERT(bpo->bpo_object != dmu_objset_pool(bpo->bpo_os)->dp_empty_bpobj);
 371
 372         if (subobj == dmu_objset_pool(bpo->bpo_os)->dp_empty_bpobj) {
 373                 bpobj_decr_empty(bpo->bpo_os, tx);
 374                 return;
 375         }
 376
 377         VERIFY3U(0, ==, bpobj_open(&subbpo, bpo->bpo_os, subobj));
 378         VERIFY3U(0, ==, bpobj_space(&subbpo, &used, &comp, &uncomp));
 379
 380         if (used == 0) {
 381                 /* No point in having an empty subobj. */
 382                 bpobj_close(&subbpo);
 383                 bpobj_free(bpo->bpo_os, subobj, tx);
 384                 return;
 385         }
 386
 387         dmu_buf_will_dirty(bpo->bpo_dbuf, tx);
 388         if (bpo->bpo_phys->bpo_subobjs == 0) {
 389                 bpo->bpo_phys->bpo_subobjs = dmu_object_alloc(bpo->bpo_os,
 390                     DMU_OT_BPOBJ_SUBOBJ, SPA_MAXBLOCKSIZE, DMU_OT_NONE, 0, tx);
 391         }
 392
 393         dmu_object_info_t doi;
 394         ASSERT0(dmu_object_info(bpo->bpo_os, bpo->bpo_phys->bpo_subobjs, &doi));
 395         ASSERT3U(doi.doi_type, ==, DMU_OT_BPOBJ_SUBOBJ);
 396
 397         mutex_enter(&bpo->bpo_lock);
 398         dmu_write(bpo->bpo_os, bpo->bpo_phys->bpo_subobjs,
 399             bpo->bpo_phys->bpo_num_subobjs * sizeof (subobj),
 400             sizeof (subobj), &subobj, tx);
 401         bpo->bpo_phys->bpo_num_subobjs++;
 402
 403         /*
 404          * If subobj has only one block of subobjs, then move subobj's
 405          * subobjs to bpo's subobj list directly.  This reduces
 406          * recursion in bpobj_iterate due to nested subobjs.
 407          */
 408         subsubobjs = subbpo.bpo_phys->bpo_subobjs;
 409         if (subsubobjs != 0) {
 410                 dmu_object_info_t doi;
 411
 412                 VERIFY3U(0, ==, dmu_object_info(bpo->bpo_os, subsubobjs, &doi));
 413                 if (doi.doi_max_offset == doi.doi_data_block_size) {
 414                         dmu_buf_t *subdb;
 415                         uint64_t numsubsub = subbpo.bpo_phys->bpo_num_subobjs;
 416
 417                         VERIFY3U(0, ==, dmu_buf_hold(bpo->bpo_os, subsubobjs,
 418                             0, FTAG, &subdb, 0));
 419                         /*
 420                          * Make sure that we are not asking dmu_write()
 421                          * to write more data than we have in our buffer.
 422                          */
 423                         VERIFY3U(subdb->db_size, >=,
 424                             numsubsub * sizeof (subobj));
 425                         dmu_write(bpo->bpo_os, bpo->bpo_phys->bpo_subobjs,
 426                             bpo->bpo_phys->bpo_num_subobjs * sizeof (subobj),
 427                             numsubsub * sizeof (subobj), subdb->db_data, tx);
 428                         dmu_buf_rele(subdb, FTAG);
 429                         bpo->bpo_phys->bpo_num_subobjs += numsubsub;
 430
 431                         dmu_buf_will_dirty(subbpo.bpo_dbuf, tx);
 432                         subbpo.bpo_phys->bpo_subobjs = 0;
 433                         VERIFY3U(0, ==, dmu_object_free(bpo->bpo_os,
 434                             subsubobjs, tx));
 435                 }
 436         }
 437         bpo->bpo_phys->bpo_bytes += used;
 438         bpo->bpo_phys->bpo_comp += comp;
 439         bpo->bpo_phys->bpo_uncomp += uncomp;
 440         mutex_exit(&bpo->bpo_lock);
 441
 442         bpobj_close(&subbpo);
 443 }
 444
 445 void
 446 bpobj_enqueue(bpobj_t *bpo, const blkptr_t *bp, dmu_tx_t *tx)
 447 {
 448         blkptr_t stored_bp = *bp;
 449         uint64_t offset;
 450         int blkoff;
 451         blkptr_t *bparray;
 452
 453         ASSERT(!BP_IS_HOLE(bp));
 454         ASSERT(bpo->bpo_object != dmu_objset_pool(bpo->bpo_os)->dp_empty_bpobj);
 455
 456         /* We never need the fill count. */
 457         stored_bp.blk_fill = 0;
 458
 459         /* The bpobj will compress better if we can leave off the checksum */
 460         if (!BP_GET_DEDUP(bp))
 461                 bzero(&stored_bp.blk_cksum, sizeof (stored_bp.blk_cksum));
 462
 463         mutex_enter(&bpo->bpo_lock);
 464
 465         offset = bpo->bpo_phys->bpo_num_blkptrs * sizeof (stored_bp);
 466         blkoff = P2PHASE(bpo->bpo_phys->bpo_num_blkptrs, bpo->bpo_epb);
 467
 468         if (bpo->bpo_cached_dbuf == NULL ||
 469             offset < bpo->bpo_cached_dbuf->db_offset ||
 470             offset >= bpo->bpo_cached_dbuf->db_offset +
 471             bpo->bpo_cached_dbuf->db_size) {
 472                 if (bpo->bpo_cached_dbuf)
 473                         dmu_buf_rele(bpo->bpo_cached_dbuf, bpo);
 474                 VERIFY3U(0, ==, dmu_buf_hold(bpo->bpo_os, bpo->bpo_object,
 475                     offset, bpo, &bpo->bpo_cached_dbuf, 0));
 476         }
 477
 478         dmu_buf_will_dirty(bpo->bpo_cached_dbuf, tx);
 479         bparray = bpo->bpo_cached_dbuf->db_data;
 480         bparray[blkoff] = stored_bp;
 481
 482         dmu_buf_will_dirty(bpo->bpo_dbuf, tx);
 483         bpo->bpo_phys->bpo_num_blkptrs++;
 484         bpo->bpo_phys->bpo_bytes +=
 485             bp_get_dsize_sync(dmu_objset_spa(bpo->bpo_os), bp);
 486         if (bpo->bpo_havecomp) {
 487                 bpo->bpo_phys->bpo_comp += BP_GET_PSIZE(bp);
 488                 bpo->bpo_phys->bpo_uncomp += BP_GET_UCSIZE(bp);
 489         }
 490         mutex_exit(&bpo->bpo_lock);
 491 }
 492
 493 struct space_range_arg {
 494         spa_t *spa;
 495         uint64_t mintxg;
 496         uint64_t maxtxg;
 497         uint64_t used;
 498         uint64_t comp;
 499         uint64_t uncomp;
 500 };
 501
 502 /* ARGSUSED */
 503 static int
 504 space_range_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx)
 505 {
 506         struct space_range_arg *sra = arg;
 507
 508         if (bp->blk_birth > sra->mintxg && bp->blk_birth <= sra->maxtxg) {
 509                 if (dsl_pool_sync_context(spa_get_dsl(sra->spa)))
 510                         sra->used += bp_get_dsize_sync(sra->spa, bp);
 511                 else
 512                         sra->used += bp_get_dsize(sra->spa, bp);
 513                 sra->comp += BP_GET_PSIZE(bp);
 514                 sra->uncomp += BP_GET_UCSIZE(bp);
 515         }
 516         return (0);
 517 }
 518
 519 int
 520 bpobj_space(bpobj_t *bpo, uint64_t *usedp, uint64_t *compp, uint64_t *uncompp)
 521 {
 522         mutex_enter(&bpo->bpo_lock);
 523
 524         *usedp = bpo->bpo_phys->bpo_bytes;
 525         if (bpo->bpo_havecomp) {
 526                 *compp = bpo->bpo_phys->bpo_comp;
 527                 *uncompp = bpo->bpo_phys->bpo_uncomp;
 528                 mutex_exit(&bpo->bpo_lock);
 529                 return (0);
 530         } else {
 531                 mutex_exit(&bpo->bpo_lock);
 532                 return (bpobj_space_range(bpo, 0, UINT64_MAX,
 533                     usedp, compp, uncompp));
 534         }
 535 }
 536
 537 /*
 538  * Return the amount of space in the bpobj which is:
 539  * mintxg < blk_birth <= maxtxg
 540  */
 541 int
 542 bpobj_space_range(bpobj_t *bpo, uint64_t mintxg, uint64_t maxtxg,
 543     uint64_t *usedp, uint64_t *compp, uint64_t *uncompp)
 544 {
 545         struct space_range_arg sra = { 0 };
 546         int err;
 547
 548         /*
 549          * As an optimization, if they want the whole txg range, just
 550          * get bpo_bytes rather than iterating over the bps.
 551          */
 552         if (mintxg < TXG_INITIAL && maxtxg == UINT64_MAX && bpo->bpo_havecomp)
 553                 return (bpobj_space(bpo, usedp, compp, uncompp));
 554
 555         sra.spa = dmu_objset_spa(bpo->bpo_os);
 556         sra.mintxg = mintxg;
 557         sra.maxtxg = maxtxg;
 558
 559         err = bpobj_iterate_nofree(bpo, space_range_cb, &sra, NULL);
 560         *usedp = sra.used;
 561         *compp = sra.comp;
 562         *uncompp = sra.uncomp;
 563         return (err);
 564 }