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) 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 }