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