kernel/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 boolean_t
 180 bpobj_is_open(const bpobj_t *bpo)
 181 {
 182         return (bpo->bpo_object != 0);
 183 }
 184
 185 void
 186 bpobj_close(bpobj_t *bpo)
 187 {
 188         /* Lame workaround for closing a bpobj that was never opened. */
 189         if (bpo->bpo_object == 0)
 190                 return;
 191
 192         dmu_buf_rele(bpo->bpo_dbuf, bpo);
 193         if (bpo->bpo_cached_dbuf != NULL)
 194                 dmu_buf_rele(bpo->bpo_cached_dbuf, bpo);
 195         bpo->bpo_dbuf = NULL;
 196         bpo->bpo_phys = NULL;
 197         bpo->bpo_cached_dbuf = NULL;
 198         bpo->bpo_object = 0;
 199
 200         mutex_destroy(&bpo->bpo_lock);
 201 }
 202
 203 boolean_t
 204 bpobj_is_empty(bpobj_t *bpo)
 205 {
 206         return (bpo->bpo_phys->bpo_num_blkptrs == 0 &&
 207             (!bpo->bpo_havesubobj || bpo->bpo_phys->bpo_num_subobjs == 0));
 208 }
 209
 210 static int
 211 bpobj_iterate_impl(bpobj_t *bpo, bpobj_itor_t func, void *arg, dmu_tx_t *tx,
 212     boolean_t free)
 213 {
 214         dmu_object_info_t doi;
 215         int epb;
 216         int64_t i;
 217         int err = 0;
 218         dmu_buf_t *dbuf = NULL;
 219
 220         ASSERT(bpobj_is_open(bpo));
 221         mutex_enter(&bpo->bpo_lock);
 222
 223         if (free)
 224                 dmu_buf_will_dirty(bpo->bpo_dbuf, tx);
 225
 226         for (i = bpo->bpo_phys->bpo_num_blkptrs - 1; i >= 0; i--) {
 227                 blkptr_t *bparray;
 228                 blkptr_t *bp;
 229                 uint64_t offset, blkoff;
 230
 231                 offset = i * sizeof (blkptr_t);
 232                 blkoff = P2PHASE(i, bpo->bpo_epb);
 233
 234                 if (dbuf == NULL || dbuf->db_offset > offset) {
 235                         if (dbuf)
 236                                 dmu_buf_rele(dbuf, FTAG);
 237                         err = dmu_buf_hold(bpo->bpo_os, bpo->bpo_object, offset,
 238                             FTAG, &dbuf, 0);
 239                         if (err)
 240                                 break;
 241                 }
 242
 243                 ASSERT3U(offset, >=, dbuf->db_offset);
 244                 ASSERT3U(offset, <, dbuf->db_offset + dbuf->db_size);
 245
 246                 bparray = dbuf->db_data;
 247                 bp = &bparray[blkoff];
 248                 err = func(arg, bp, tx);
 249                 if (err)
 250                         break;
 251                 if (free) {
 252                         bpo->bpo_phys->bpo_bytes -=
 253                             bp_get_dsize_sync(dmu_objset_spa(bpo->bpo_os), bp);
 254                         ASSERT3S(bpo->bpo_phys->bpo_bytes, >=, 0);
 255                         if (bpo->bpo_havecomp) {
 256                                 bpo->bpo_phys->bpo_comp -= BP_GET_PSIZE(bp);
 257                                 bpo->bpo_phys->bpo_uncomp -= BP_GET_UCSIZE(bp);
 258                         }
 259                         bpo->bpo_phys->bpo_num_blkptrs--;
 260                         ASSERT3S(bpo->bpo_phys->bpo_num_blkptrs, >=, 0);
 261                 }
 262         }
 263         if (dbuf) {
 264                 dmu_buf_rele(dbuf, FTAG);
 265                 dbuf = NULL;
 266         }
 267         if (free) {
 268                 VERIFY3U(0, ==, dmu_free_range(bpo->bpo_os, bpo->bpo_object,
 269                     (i + 1) * sizeof (blkptr_t), -1ULL, tx));
 270         }
 271         if (err || !bpo->bpo_havesubobj || bpo->bpo_phys->bpo_subobjs == 0)
 272                 goto out;
 273
 274         ASSERT(bpo->bpo_havecomp);
 275         err = dmu_object_info(bpo->bpo_os, bpo->bpo_phys->bpo_subobjs, &doi);
 276         if (err) {
 277                 mutex_exit(&bpo->bpo_lock);
 278                 return (err);
 279         }
 280         ASSERT3U(doi.doi_type, ==, DMU_OT_BPOBJ_SUBOBJ);
 281         epb = doi.doi_data_block_size / sizeof (uint64_t);
 282
 283         for (i = bpo->bpo_phys->bpo_num_subobjs - 1; i >= 0; i--) {
 284                 uint64_t *objarray;
 285                 uint64_t offset, blkoff;
 286                 bpobj_t sublist;
 287                 uint64_t used_before, comp_before, uncomp_before;
 288                 uint64_t used_after, comp_after, uncomp_after;
 289
 290                 offset = i * sizeof (uint64_t);
 291                 blkoff = P2PHASE(i, epb);
 292
 293                 if (dbuf == NULL || dbuf->db_offset > offset) {
 294                         if (dbuf)
 295                                 dmu_buf_rele(dbuf, FTAG);
 296                         err = dmu_buf_hold(bpo->bpo_os,
 297                             bpo->bpo_phys->bpo_subobjs, offset, FTAG, &dbuf, 0);
 298                         if (err)
 299                                 break;
 300                 }
 301
 302                 ASSERT3U(offset, >=, dbuf->db_offset);
 303                 ASSERT3U(offset, <, dbuf->db_offset + dbuf->db_size);
 304
 305                 objarray = dbuf->db_data;
 306                 err = bpobj_open(&sublist, bpo->bpo_os, objarray[blkoff]);
 307                 if (err)
 308                         break;
 309                 if (free) {
 310                         err = bpobj_space(&sublist,
 311                             &used_before, &comp_before, &uncomp_before);
 312                         if (err != 0) {
 313                                 bpobj_close(&sublist);
 314                                 break;
 315                         }
 316                 }
 317                 err = bpobj_iterate_impl(&sublist, func, arg, tx, free);
 318                 if (free) {
 319                         VERIFY3U(0, ==, bpobj_space(&sublist,
 320                             &used_after, &comp_after, &uncomp_after));
 321                         bpo->bpo_phys->bpo_bytes -= used_before - used_after;
 322                         ASSERT3S(bpo->bpo_phys->bpo_bytes, >=, 0);
 323                         bpo->bpo_phys->bpo_comp -= comp_before - comp_after;
 324                         bpo->bpo_phys->bpo_uncomp -=
 325                             uncomp_before - uncomp_after;
 326                 }
 327
 328                 bpobj_close(&sublist);
 329                 if (err)
 330                         break;
 331                 if (free) {
 332                         err = dmu_object_free(bpo->bpo_os,
 333                             objarray[blkoff], tx);
 334                         if (err)
 335                                 break;
 336                         bpo->bpo_phys->bpo_num_subobjs--;
 337                         ASSERT3S(bpo->bpo_phys->bpo_num_subobjs, >=, 0);
 338                 }
 339         }
 340         if (dbuf) {
 341                 dmu_buf_rele(dbuf, FTAG);
 342                 dbuf = NULL;
 343         }
 344         if (free) {
 345                 VERIFY3U(0, ==, dmu_free_range(bpo->bpo_os,
 346                     bpo->bpo_phys->bpo_subobjs,
 347                     (i + 1) * sizeof (uint64_t), -1ULL, tx));
 348         }
 349
 350 out:
 351         /* If there are no entries, there should be no bytes. */
 352         if (bpobj_is_empty(bpo)) {
 353                 ASSERT0(bpo->bpo_phys->bpo_bytes);
 354                 ASSERT0(bpo->bpo_phys->bpo_comp);
 355                 ASSERT0(bpo->bpo_phys->bpo_uncomp);
 356         }
 357
 358         mutex_exit(&bpo->bpo_lock);
 359         return (err);
 360 }
 361
 362 /*
 363  * Iterate and remove the entries.  If func returns nonzero, iteration
 364  * will stop and that entry will not be removed.
 365  */
 366 int
 367 bpobj_iterate(bpobj_t *bpo, bpobj_itor_t func, void *arg, dmu_tx_t *tx)
 368 {
 369         return (bpobj_iterate_impl(bpo, func, arg, tx, B_TRUE));
 370 }
 371
 372 /*
 373  * Iterate the entries.  If func returns nonzero, iteration will stop.
 374  */
 375 int
 376 bpobj_iterate_nofree(bpobj_t *bpo, bpobj_itor_t func, void *arg, dmu_tx_t *tx)
 377 {
 378         return (bpobj_iterate_impl(bpo, func, arg, tx, B_FALSE));
 379 }
 380
 381 void
 382 bpobj_enqueue_subobj(bpobj_t *bpo, uint64_t subobj, dmu_tx_t *tx)
 383 {
 384         bpobj_t subbpo;
 385         uint64_t used, comp, uncomp, subsubobjs;
 386
 387         ASSERT(bpobj_is_open(bpo));
 388         ASSERT(subobj != 0);
 389         ASSERT(bpo->bpo_havesubobj);
 390         ASSERT(bpo->bpo_havecomp);
 391         ASSERT(bpo->bpo_object != dmu_objset_pool(bpo->bpo_os)->dp_empty_bpobj);
 392
 393         if (subobj == dmu_objset_pool(bpo->bpo_os)->dp_empty_bpobj) {
 394                 bpobj_decr_empty(bpo->bpo_os, tx);
 395                 return;
 396         }
 397
 398         VERIFY3U(0, ==, bpobj_open(&subbpo, bpo->bpo_os, subobj));
 399         VERIFY3U(0, ==, bpobj_space(&subbpo, &used, &comp, &uncomp));
 400
 401         if (bpobj_is_empty(&subbpo)) {
 402                 /* No point in having an empty subobj. */
 403                 bpobj_close(&subbpo);
 404                 bpobj_free(bpo->bpo_os, subobj, tx);
 405                 return;
 406         }
 407
 408         mutex_enter(&bpo->bpo_lock);
 409         dmu_buf_will_dirty(bpo->bpo_dbuf, tx);
 410         if (bpo->bpo_phys->bpo_subobjs == 0) {
 411                 bpo->bpo_phys->bpo_subobjs = dmu_object_alloc(bpo->bpo_os,
 412                     DMU_OT_BPOBJ_SUBOBJ, SPA_OLD_MAXBLOCKSIZE,
 413                     DMU_OT_NONE, 0, tx);
 414         }
 415
 416         dmu_object_info_t doi;
 417         ASSERT0(dmu_object_info(bpo->bpo_os, bpo->bpo_phys->bpo_subobjs, &doi));
 418         ASSERT3U(doi.doi_type, ==, DMU_OT_BPOBJ_SUBOBJ);
 419
 420         dmu_write(bpo->bpo_os, bpo->bpo_phys->bpo_subobjs,
 421             bpo->bpo_phys->bpo_num_subobjs * sizeof (subobj),
 422             sizeof (subobj), &subobj, tx);
 423         bpo->bpo_phys->bpo_num_subobjs++;
 424
 425         /*
 426          * If subobj has only one block of subobjs, then move subobj's
 427          * subobjs to bpo's subobj list directly.  This reduces
 428          * recursion in bpobj_iterate due to nested subobjs.
 429          */
 430         subsubobjs = subbpo.bpo_phys->bpo_subobjs;
 431         if (subsubobjs != 0) {
 432                 dmu_object_info_t doi;
 433
 434                 VERIFY3U(0, ==, dmu_object_info(bpo->bpo_os, subsubobjs, &doi));
 435                 if (doi.doi_max_offset == doi.doi_data_block_size) {
 436                         dmu_buf_t *subdb;
 437                         uint64_t numsubsub = subbpo.bpo_phys->bpo_num_subobjs;
 438
 439                         VERIFY3U(0, ==, dmu_buf_hold(bpo->bpo_os, subsubobjs,
 440                             0, FTAG, &subdb, 0));
 441                         /*
 442                          * Make sure that we are not asking dmu_write()
 443                          * to write more data than we have in our buffer.
 444                          */
 445                         VERIFY3U(subdb->db_size, >=,
 446                             numsubsub * sizeof (subobj));
 447                         dmu_write(bpo->bpo_os, bpo->bpo_phys->bpo_subobjs,
 448                             bpo->bpo_phys->bpo_num_subobjs * sizeof (subobj),
 449                             numsubsub * sizeof (subobj), subdb->db_data, tx);
 450                         dmu_buf_rele(subdb, FTAG);
 451                         bpo->bpo_phys->bpo_num_subobjs += numsubsub;
 452
 453                         dmu_buf_will_dirty(subbpo.bpo_dbuf, tx);
 454                         subbpo.bpo_phys->bpo_subobjs = 0;
 455                         VERIFY3U(0, ==, dmu_object_free(bpo->bpo_os,
 456                             subsubobjs, tx));
 457                 }
 458         }
 459         bpo->bpo_phys->bpo_bytes += used;
 460         bpo->bpo_phys->bpo_comp += comp;
 461         bpo->bpo_phys->bpo_uncomp += uncomp;
 462         mutex_exit(&bpo->bpo_lock);
 463
 464         bpobj_close(&subbpo);
 465 }
 466
 467 void
 468 bpobj_enqueue(bpobj_t *bpo, const blkptr_t *bp, dmu_tx_t *tx)
 469 {
 470         blkptr_t stored_bp = *bp;
 471         uint64_t offset;
 472         int blkoff;
 473         blkptr_t *bparray;
 474
 475         ASSERT(bpobj_is_open(bpo));
 476         ASSERT(!BP_IS_HOLE(bp));
 477         ASSERT(bpo->bpo_object != dmu_objset_pool(bpo->bpo_os)->dp_empty_bpobj);
 478
 479         if (BP_IS_EMBEDDED(bp)) {
 480                 /*
 481                  * The bpobj will compress better without the payload.
 482                  *
 483                  * Note that we store EMBEDDED bp's because they have an
 484                  * uncompressed size, which must be accounted for.  An
 485                  * alternative would be to add their size to bpo_uncomp
 486                  * without storing the bp, but that would create additional
 487                  * complications: bpo_uncomp would be inconsistent with the
 488                  * set of BP's stored, and bpobj_iterate() wouldn't visit
 489                  * all the space accounted for in the bpobj.
 490                  */
 491                 bzero(&stored_bp, sizeof (stored_bp));
 492                 stored_bp.blk_prop = bp->blk_prop;
 493                 stored_bp.blk_birth = bp->blk_birth;
 494         } else if (!BP_GET_DEDUP(bp)) {
 495                 /* The bpobj will compress better without the checksum */
 496                 bzero(&stored_bp.blk_cksum, sizeof (stored_bp.blk_cksum));
 497         }
 498
 499         /* We never need the fill count. */
 500         stored_bp.blk_fill = 0;
 501
 502         mutex_enter(&bpo->bpo_lock);
 503
 504         offset = bpo->bpo_phys->bpo_num_blkptrs * sizeof (stored_bp);
 505         blkoff = P2PHASE(bpo->bpo_phys->bpo_num_blkptrs, bpo->bpo_epb);
 506
 507         if (bpo->bpo_cached_dbuf == NULL ||
 508             offset < bpo->bpo_cached_dbuf->db_offset ||
 509             offset >= bpo->bpo_cached_dbuf->db_offset +
 510             bpo->bpo_cached_dbuf->db_size) {
 511                 if (bpo->bpo_cached_dbuf)
 512                         dmu_buf_rele(bpo->bpo_cached_dbuf, bpo);
 513                 VERIFY3U(0, ==, dmu_buf_hold(bpo->bpo_os, bpo->bpo_object,
 514                     offset, bpo, &bpo->bpo_cached_dbuf, 0));
 515         }
 516
 517         dmu_buf_will_dirty(bpo->bpo_cached_dbuf, tx);
 518         bparray = bpo->bpo_cached_dbuf->db_data;
 519         bparray[blkoff] = stored_bp;
 520
 521         dmu_buf_will_dirty(bpo->bpo_dbuf, tx);
 522         bpo->bpo_phys->bpo_num_blkptrs++;
 523         bpo->bpo_phys->bpo_bytes +=
 524             bp_get_dsize_sync(dmu_objset_spa(bpo->bpo_os), bp);
 525         if (bpo->bpo_havecomp) {
 526                 bpo->bpo_phys->bpo_comp += BP_GET_PSIZE(bp);
 527                 bpo->bpo_phys->bpo_uncomp += BP_GET_UCSIZE(bp);
 528         }
 529         mutex_exit(&bpo->bpo_lock);
 530 }
 531
 532 struct space_range_arg {
 533         spa_t *spa;
 534         uint64_t mintxg;
 535         uint64_t maxtxg;
 536         uint64_t used;
 537         uint64_t comp;
 538         uint64_t uncomp;
 539 };
 540
 541 /* ARGSUSED */
 542 static int
 543 space_range_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx)
 544 {
 545         struct space_range_arg *sra = arg;
 546
 547         if (bp->blk_birth > sra->mintxg && bp->blk_birth <= sra->maxtxg) {
 548                 if (dsl_pool_sync_context(spa_get_dsl(sra->spa)))
 549                         sra->used += bp_get_dsize_sync(sra->spa, bp);
 550                 else
 551                         sra->used += bp_get_dsize(sra->spa, bp);
 552                 sra->comp += BP_GET_PSIZE(bp);
 553                 sra->uncomp += BP_GET_UCSIZE(bp);
 554         }
 555         return (0);
 556 }
 557
 558 int
 559 bpobj_space(bpobj_t *bpo, uint64_t *usedp, uint64_t *compp, uint64_t *uncompp)
 560 {
 561         ASSERT(bpobj_is_open(bpo));
 562         mutex_enter(&bpo->bpo_lock);
 563
 564         *usedp = bpo->bpo_phys->bpo_bytes;
 565         if (bpo->bpo_havecomp) {
 566                 *compp = bpo->bpo_phys->bpo_comp;
 567                 *uncompp = bpo->bpo_phys->bpo_uncomp;
 568                 mutex_exit(&bpo->bpo_lock);
 569                 return (0);
 570         } else {
 571                 mutex_exit(&bpo->bpo_lock);
 572                 return (bpobj_space_range(bpo, 0, UINT64_MAX,
 573                     usedp, compp, uncompp));
 574         }
 575 }
 576
 577 /*
 578  * Return the amount of space in the bpobj which is:
 579  * mintxg < blk_birth <= maxtxg
 580  */
 581 int
 582 bpobj_space_range(bpobj_t *bpo, uint64_t mintxg, uint64_t maxtxg,
 583     uint64_t *usedp, uint64_t *compp, uint64_t *uncompp)
 584 {
 585         struct space_range_arg sra = { 0 };
 586         int err;
 587
 588         ASSERT(bpobj_is_open(bpo));
 589
 590         /*
 591          * As an optimization, if they want the whole txg range, just
 592          * get bpo_bytes rather than iterating over the bps.
 593          */
 594         if (mintxg < TXG_INITIAL && maxtxg == UINT64_MAX && bpo->bpo_havecomp)
 595                 return (bpobj_space(bpo, usedp, compp, uncompp));
 596
 597         sra.spa = dmu_objset_spa(bpo->bpo_os);
 598         sra.mintxg = mintxg;
 599         sra.maxtxg = maxtxg;
 600
 601         err = bpobj_iterate_nofree(bpo, space_range_cb, &sra, NULL);
 602         *usedp = sra.used;
 603         *compp = sra.comp;
 604         *uncompp = sra.uncomp;
 605         return (err);
 606 }