1fa9e4066Sahrens /* 2fa9e4066Sahrens * CDDL HEADER START 3fa9e4066Sahrens * 4fa9e4066Sahrens * The contents of this file are subject to the terms of the 5ea8dc4b6Seschrock * Common Development and Distribution License (the "License"). 6ea8dc4b6Seschrock * You may not use this file except in compliance with the License. 7fa9e4066Sahrens * 8fa9e4066Sahrens * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9fa9e4066Sahrens * or http://www.opensolaris.org/os/licensing. 10fa9e4066Sahrens * See the License for the specific language governing permissions 11fa9e4066Sahrens * and limitations under the License. 12fa9e4066Sahrens * 13fa9e4066Sahrens * When distributing Covered Code, include this CDDL HEADER in each 14fa9e4066Sahrens * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15fa9e4066Sahrens * If applicable, add the following below this CDDL HEADER, with the 16fa9e4066Sahrens * fields enclosed by brackets "[]" replaced with your own identifying 17fa9e4066Sahrens * information: Portions Copyright [yyyy] [name of copyright owner] 18fa9e4066Sahrens * 19fa9e4066Sahrens * CDDL HEADER END 20fa9e4066Sahrens */ 21fa9e4066Sahrens /* 22ea8dc4b6Seschrock * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 23fa9e4066Sahrens * Use is subject to license terms. 24fa9e4066Sahrens */ 25fa9e4066Sahrens 26fa9e4066Sahrens #pragma ident "%Z%%M% %I% %E% SMI" 27fa9e4066Sahrens 28fa9e4066Sahrens #include <sys/dmu_objset.h> 29fa9e4066Sahrens #include <sys/dsl_dataset.h> 30fa9e4066Sahrens #include <sys/dsl_dir.h> 3199653d4eSeschrock #include <sys/dsl_prop.h> 321d452cf5Sahrens #include <sys/dsl_synctask.h> 33fa9e4066Sahrens #include <sys/dmu_traverse.h> 34fa9e4066Sahrens #include <sys/dmu_tx.h> 35fa9e4066Sahrens #include <sys/arc.h> 36fa9e4066Sahrens #include <sys/zio.h> 37fa9e4066Sahrens #include <sys/zap.h> 38fa9e4066Sahrens #include <sys/unique.h> 39fa9e4066Sahrens #include <sys/zfs_context.h> 40fa9e4066Sahrens 411d452cf5Sahrens static dsl_checkfunc_t dsl_dataset_destroy_begin_check; 421d452cf5Sahrens static dsl_syncfunc_t dsl_dataset_destroy_begin_sync; 431d452cf5Sahrens static dsl_checkfunc_t dsl_dataset_rollback_check; 441d452cf5Sahrens static dsl_syncfunc_t dsl_dataset_rollback_sync; 451d452cf5Sahrens static dsl_checkfunc_t dsl_dataset_destroy_check; 461d452cf5Sahrens static dsl_syncfunc_t dsl_dataset_destroy_sync; 47e1930233Sbonwick 48fa9e4066Sahrens #define DOS_REF_MAX (1ULL << 62) 49fa9e4066Sahrens 50fa9e4066Sahrens #define DSL_DEADLIST_BLOCKSIZE SPA_MAXBLOCKSIZE 51fa9e4066Sahrens 52fa9e4066Sahrens /* 53fa9e4066Sahrens * We use weighted reference counts to express the various forms of exclusion 54fa9e4066Sahrens * between different open modes. A STANDARD open is 1 point, an EXCLUSIVE open 55fa9e4066Sahrens * is DOS_REF_MAX, and a PRIMARY open is little more than half of an EXCLUSIVE. 56fa9e4066Sahrens * This makes the exclusion logic simple: the total refcnt for all opens cannot 57fa9e4066Sahrens * exceed DOS_REF_MAX. For example, EXCLUSIVE opens are exclusive because their 58fa9e4066Sahrens * weight (DOS_REF_MAX) consumes the entire refcnt space. PRIMARY opens consume 59fa9e4066Sahrens * just over half of the refcnt space, so there can't be more than one, but it 60fa9e4066Sahrens * can peacefully coexist with any number of STANDARD opens. 61fa9e4066Sahrens */ 62fa9e4066Sahrens static uint64_t ds_refcnt_weight[DS_MODE_LEVELS] = { 63fa9e4066Sahrens 0, /* DOS_MODE_NONE - invalid */ 64fa9e4066Sahrens 1, /* DOS_MODE_STANDARD - unlimited number */ 65fa9e4066Sahrens (DOS_REF_MAX >> 1) + 1, /* DOS_MODE_PRIMARY - only one of these */ 66fa9e4066Sahrens DOS_REF_MAX /* DOS_MODE_EXCLUSIVE - no other opens */ 67fa9e4066Sahrens }; 68fa9e4066Sahrens 69fa9e4066Sahrens 70fa9e4066Sahrens void 71fa9e4066Sahrens dsl_dataset_block_born(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx) 72fa9e4066Sahrens { 7399653d4eSeschrock int used = bp_get_dasize(tx->tx_pool->dp_spa, bp); 74fa9e4066Sahrens int compressed = BP_GET_PSIZE(bp); 75fa9e4066Sahrens int uncompressed = BP_GET_UCSIZE(bp); 76fa9e4066Sahrens 77fa9e4066Sahrens dprintf_bp(bp, "born, ds=%p\n", ds); 78fa9e4066Sahrens 79fa9e4066Sahrens ASSERT(dmu_tx_is_syncing(tx)); 80fa9e4066Sahrens /* It could have been compressed away to nothing */ 81fa9e4066Sahrens if (BP_IS_HOLE(bp)) 82fa9e4066Sahrens return; 83fa9e4066Sahrens ASSERT(BP_GET_TYPE(bp) != DMU_OT_NONE); 84fa9e4066Sahrens ASSERT3U(BP_GET_TYPE(bp), <, DMU_OT_NUMTYPES); 85fa9e4066Sahrens if (ds == NULL) { 86fa9e4066Sahrens /* 87fa9e4066Sahrens * Account for the meta-objset space in its placeholder 88fa9e4066Sahrens * dsl_dir. 89fa9e4066Sahrens */ 90fa9e4066Sahrens ASSERT3U(compressed, ==, uncompressed); /* it's all metadata */ 91fa9e4066Sahrens dsl_dir_diduse_space(tx->tx_pool->dp_mos_dir, 92fa9e4066Sahrens used, compressed, uncompressed, tx); 93fa9e4066Sahrens dsl_dir_dirty(tx->tx_pool->dp_mos_dir, tx); 94fa9e4066Sahrens return; 95fa9e4066Sahrens } 96fa9e4066Sahrens dmu_buf_will_dirty(ds->ds_dbuf, tx); 97fa9e4066Sahrens mutex_enter(&ds->ds_lock); 98fa9e4066Sahrens ds->ds_phys->ds_used_bytes += used; 99fa9e4066Sahrens ds->ds_phys->ds_compressed_bytes += compressed; 100fa9e4066Sahrens ds->ds_phys->ds_uncompressed_bytes += uncompressed; 101fa9e4066Sahrens ds->ds_phys->ds_unique_bytes += used; 102fa9e4066Sahrens mutex_exit(&ds->ds_lock); 103fa9e4066Sahrens dsl_dir_diduse_space(ds->ds_dir, 104fa9e4066Sahrens used, compressed, uncompressed, tx); 105fa9e4066Sahrens } 106fa9e4066Sahrens 107fa9e4066Sahrens void 108fa9e4066Sahrens dsl_dataset_block_kill(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx) 109fa9e4066Sahrens { 11099653d4eSeschrock int used = bp_get_dasize(tx->tx_pool->dp_spa, bp); 111fa9e4066Sahrens int compressed = BP_GET_PSIZE(bp); 112fa9e4066Sahrens int uncompressed = BP_GET_UCSIZE(bp); 113fa9e4066Sahrens 114fa9e4066Sahrens ASSERT(dmu_tx_is_syncing(tx)); 115fa9e4066Sahrens if (BP_IS_HOLE(bp)) 116fa9e4066Sahrens return; 117fa9e4066Sahrens 118fa9e4066Sahrens ASSERT(used > 0); 119fa9e4066Sahrens if (ds == NULL) { 120fa9e4066Sahrens /* 121fa9e4066Sahrens * Account for the meta-objset space in its placeholder 122fa9e4066Sahrens * dataset. 123fa9e4066Sahrens */ 124fa9e4066Sahrens /* XXX this can fail, what do we do when it does? */ 125fa9e4066Sahrens (void) arc_free(NULL, tx->tx_pool->dp_spa, 126fa9e4066Sahrens tx->tx_txg, bp, NULL, NULL, ARC_WAIT); 127fa9e4066Sahrens bzero(bp, sizeof (blkptr_t)); 128fa9e4066Sahrens 129fa9e4066Sahrens dsl_dir_diduse_space(tx->tx_pool->dp_mos_dir, 130fa9e4066Sahrens -used, -compressed, -uncompressed, tx); 131fa9e4066Sahrens dsl_dir_dirty(tx->tx_pool->dp_mos_dir, tx); 132fa9e4066Sahrens return; 133fa9e4066Sahrens } 134fa9e4066Sahrens ASSERT3P(tx->tx_pool, ==, ds->ds_dir->dd_pool); 135fa9e4066Sahrens 136fa9e4066Sahrens dmu_buf_will_dirty(ds->ds_dbuf, tx); 137fa9e4066Sahrens 138fa9e4066Sahrens if (bp->blk_birth > ds->ds_phys->ds_prev_snap_txg) { 139fa9e4066Sahrens dprintf_bp(bp, "freeing: %s", ""); 140fa9e4066Sahrens /* XXX check return code? */ 141fa9e4066Sahrens (void) arc_free(NULL, tx->tx_pool->dp_spa, 142fa9e4066Sahrens tx->tx_txg, bp, NULL, NULL, ARC_WAIT); 143fa9e4066Sahrens 144fa9e4066Sahrens mutex_enter(&ds->ds_lock); 145fa9e4066Sahrens /* XXX unique_bytes is not accurate for head datasets */ 146fa9e4066Sahrens /* ASSERT3U(ds->ds_phys->ds_unique_bytes, >=, used); */ 147fa9e4066Sahrens ds->ds_phys->ds_unique_bytes -= used; 148fa9e4066Sahrens mutex_exit(&ds->ds_lock); 149fa9e4066Sahrens dsl_dir_diduse_space(ds->ds_dir, 150fa9e4066Sahrens -used, -compressed, -uncompressed, tx); 151fa9e4066Sahrens } else { 152fa9e4066Sahrens dprintf_bp(bp, "putting on dead list: %s", ""); 153ea8dc4b6Seschrock VERIFY(0 == bplist_enqueue(&ds->ds_deadlist, bp, tx)); 154fa9e4066Sahrens /* if (bp->blk_birth > prev prev snap txg) prev unique += bs */ 155fa9e4066Sahrens if (ds->ds_phys->ds_prev_snap_obj != 0) { 156fa9e4066Sahrens ASSERT3U(ds->ds_prev->ds_object, ==, 157fa9e4066Sahrens ds->ds_phys->ds_prev_snap_obj); 158fa9e4066Sahrens ASSERT(ds->ds_prev->ds_phys->ds_num_children > 0); 159fa9e4066Sahrens if (ds->ds_prev->ds_phys->ds_next_snap_obj == 16099653d4eSeschrock ds->ds_object && bp->blk_birth > 161fa9e4066Sahrens ds->ds_prev->ds_phys->ds_prev_snap_txg) { 162fa9e4066Sahrens dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 163fa9e4066Sahrens mutex_enter(&ds->ds_prev->ds_lock); 164fa9e4066Sahrens ds->ds_prev->ds_phys->ds_unique_bytes += 165fa9e4066Sahrens used; 166fa9e4066Sahrens mutex_exit(&ds->ds_prev->ds_lock); 167fa9e4066Sahrens } 168fa9e4066Sahrens } 169fa9e4066Sahrens } 170fa9e4066Sahrens bzero(bp, sizeof (blkptr_t)); 171fa9e4066Sahrens mutex_enter(&ds->ds_lock); 172fa9e4066Sahrens ASSERT3U(ds->ds_phys->ds_used_bytes, >=, used); 173fa9e4066Sahrens ds->ds_phys->ds_used_bytes -= used; 174fa9e4066Sahrens ASSERT3U(ds->ds_phys->ds_compressed_bytes, >=, compressed); 175fa9e4066Sahrens ds->ds_phys->ds_compressed_bytes -= compressed; 176fa9e4066Sahrens ASSERT3U(ds->ds_phys->ds_uncompressed_bytes, >=, uncompressed); 177fa9e4066Sahrens ds->ds_phys->ds_uncompressed_bytes -= uncompressed; 178fa9e4066Sahrens mutex_exit(&ds->ds_lock); 179fa9e4066Sahrens } 180fa9e4066Sahrens 181ea8dc4b6Seschrock uint64_t 182ea8dc4b6Seschrock dsl_dataset_prev_snap_txg(dsl_dataset_t *ds) 183fa9e4066Sahrens { 184fa9e4066Sahrens if (ds == NULL) 185ea8dc4b6Seschrock return (0); 186fa9e4066Sahrens /* 187fa9e4066Sahrens * The snapshot creation could fail, but that would cause an 188fa9e4066Sahrens * incorrect FALSE return, which would only result in an 189fa9e4066Sahrens * overestimation of the amount of space that an operation would 190fa9e4066Sahrens * consume, which is OK. 191fa9e4066Sahrens * 192fa9e4066Sahrens * There's also a small window where we could miss a pending 193fa9e4066Sahrens * snapshot, because we could set the sync task in the quiescing 194fa9e4066Sahrens * phase. So this should only be used as a guess. 195fa9e4066Sahrens */ 1961d452cf5Sahrens return (MAX(ds->ds_phys->ds_prev_snap_txg, ds->ds_trysnap_txg)); 197ea8dc4b6Seschrock } 198ea8dc4b6Seschrock 199ea8dc4b6Seschrock int 200ea8dc4b6Seschrock dsl_dataset_block_freeable(dsl_dataset_t *ds, uint64_t blk_birth) 201ea8dc4b6Seschrock { 202ea8dc4b6Seschrock return (blk_birth > dsl_dataset_prev_snap_txg(ds)); 203fa9e4066Sahrens } 204fa9e4066Sahrens 205fa9e4066Sahrens /* ARGSUSED */ 206fa9e4066Sahrens static void 207fa9e4066Sahrens dsl_dataset_evict(dmu_buf_t *db, void *dsv) 208fa9e4066Sahrens { 209fa9e4066Sahrens dsl_dataset_t *ds = dsv; 210fa9e4066Sahrens dsl_pool_t *dp = ds->ds_dir->dd_pool; 211fa9e4066Sahrens 212fa9e4066Sahrens /* open_refcount == DOS_REF_MAX when deleting */ 213fa9e4066Sahrens ASSERT(ds->ds_open_refcount == 0 || 214fa9e4066Sahrens ds->ds_open_refcount == DOS_REF_MAX); 215fa9e4066Sahrens 216fa9e4066Sahrens dprintf_ds(ds, "evicting %s\n", ""); 217fa9e4066Sahrens 218fa9e4066Sahrens unique_remove(ds->ds_phys->ds_fsid_guid); 219fa9e4066Sahrens 220fa9e4066Sahrens if (ds->ds_user_ptr != NULL) 221fa9e4066Sahrens ds->ds_user_evict_func(ds, ds->ds_user_ptr); 222fa9e4066Sahrens 223fa9e4066Sahrens if (ds->ds_prev) { 224fa9e4066Sahrens dsl_dataset_close(ds->ds_prev, DS_MODE_NONE, ds); 225fa9e4066Sahrens ds->ds_prev = NULL; 226fa9e4066Sahrens } 227fa9e4066Sahrens 228fa9e4066Sahrens bplist_close(&ds->ds_deadlist); 229fa9e4066Sahrens dsl_dir_close(ds->ds_dir, ds); 230fa9e4066Sahrens 231fa9e4066Sahrens if (list_link_active(&ds->ds_synced_link)) 232fa9e4066Sahrens list_remove(&dp->dp_synced_objsets, ds); 233fa9e4066Sahrens 234*5ad82045Snd mutex_destroy(&ds->ds_lock); 235*5ad82045Snd mutex_destroy(&ds->ds_deadlist.bpl_lock); 236*5ad82045Snd 237fa9e4066Sahrens kmem_free(ds, sizeof (dsl_dataset_t)); 238fa9e4066Sahrens } 239fa9e4066Sahrens 240ea8dc4b6Seschrock static int 241fa9e4066Sahrens dsl_dataset_get_snapname(dsl_dataset_t *ds) 242fa9e4066Sahrens { 243fa9e4066Sahrens dsl_dataset_phys_t *headphys; 244fa9e4066Sahrens int err; 245fa9e4066Sahrens dmu_buf_t *headdbuf; 246fa9e4066Sahrens dsl_pool_t *dp = ds->ds_dir->dd_pool; 247fa9e4066Sahrens objset_t *mos = dp->dp_meta_objset; 248fa9e4066Sahrens 249fa9e4066Sahrens if (ds->ds_snapname[0]) 250ea8dc4b6Seschrock return (0); 251fa9e4066Sahrens if (ds->ds_phys->ds_next_snap_obj == 0) 252ea8dc4b6Seschrock return (0); 253fa9e4066Sahrens 254ea8dc4b6Seschrock err = dmu_bonus_hold(mos, ds->ds_dir->dd_phys->dd_head_dataset_obj, 255ea8dc4b6Seschrock FTAG, &headdbuf); 256ea8dc4b6Seschrock if (err) 257ea8dc4b6Seschrock return (err); 258fa9e4066Sahrens headphys = headdbuf->db_data; 259fa9e4066Sahrens err = zap_value_search(dp->dp_meta_objset, 260fa9e4066Sahrens headphys->ds_snapnames_zapobj, ds->ds_object, ds->ds_snapname); 261ea8dc4b6Seschrock dmu_buf_rele(headdbuf, FTAG); 262ea8dc4b6Seschrock return (err); 263fa9e4066Sahrens } 264fa9e4066Sahrens 265ea8dc4b6Seschrock int 266fa9e4066Sahrens dsl_dataset_open_obj(dsl_pool_t *dp, uint64_t dsobj, const char *snapname, 267ea8dc4b6Seschrock int mode, void *tag, dsl_dataset_t **dsp) 268fa9e4066Sahrens { 269fa9e4066Sahrens uint64_t weight = ds_refcnt_weight[DS_MODE_LEVEL(mode)]; 270fa9e4066Sahrens objset_t *mos = dp->dp_meta_objset; 271fa9e4066Sahrens dmu_buf_t *dbuf; 272fa9e4066Sahrens dsl_dataset_t *ds; 273ea8dc4b6Seschrock int err; 274fa9e4066Sahrens 275fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dp->dp_config_rwlock) || 276fa9e4066Sahrens dsl_pool_sync_context(dp)); 277fa9e4066Sahrens 278ea8dc4b6Seschrock err = dmu_bonus_hold(mos, dsobj, tag, &dbuf); 279ea8dc4b6Seschrock if (err) 280ea8dc4b6Seschrock return (err); 281fa9e4066Sahrens ds = dmu_buf_get_user(dbuf); 282fa9e4066Sahrens if (ds == NULL) { 283fa9e4066Sahrens dsl_dataset_t *winner; 284fa9e4066Sahrens 285fa9e4066Sahrens ds = kmem_zalloc(sizeof (dsl_dataset_t), KM_SLEEP); 286fa9e4066Sahrens ds->ds_dbuf = dbuf; 287fa9e4066Sahrens ds->ds_object = dsobj; 288fa9e4066Sahrens ds->ds_phys = dbuf->db_data; 289fa9e4066Sahrens 290*5ad82045Snd mutex_init(&ds->ds_lock, NULL, MUTEX_DEFAULT, NULL); 291*5ad82045Snd mutex_init(&ds->ds_deadlist.bpl_lock, NULL, MUTEX_DEFAULT, 292*5ad82045Snd NULL); 293*5ad82045Snd 294ea8dc4b6Seschrock err = bplist_open(&ds->ds_deadlist, 295fa9e4066Sahrens mos, ds->ds_phys->ds_deadlist_obj); 296ea8dc4b6Seschrock if (err == 0) { 297ea8dc4b6Seschrock err = dsl_dir_open_obj(dp, 298ea8dc4b6Seschrock ds->ds_phys->ds_dir_obj, NULL, ds, &ds->ds_dir); 299ea8dc4b6Seschrock } 300ea8dc4b6Seschrock if (err) { 301ea8dc4b6Seschrock /* 302ea8dc4b6Seschrock * we don't really need to close the blist if we 303ea8dc4b6Seschrock * just opened it. 304ea8dc4b6Seschrock */ 305*5ad82045Snd mutex_destroy(&ds->ds_lock); 306*5ad82045Snd mutex_destroy(&ds->ds_deadlist.bpl_lock); 307ea8dc4b6Seschrock kmem_free(ds, sizeof (dsl_dataset_t)); 308ea8dc4b6Seschrock dmu_buf_rele(dbuf, tag); 309ea8dc4b6Seschrock return (err); 310ea8dc4b6Seschrock } 311fa9e4066Sahrens 312fa9e4066Sahrens if (ds->ds_dir->dd_phys->dd_head_dataset_obj == dsobj) { 313fa9e4066Sahrens ds->ds_snapname[0] = '\0'; 314fa9e4066Sahrens if (ds->ds_phys->ds_prev_snap_obj) { 315ea8dc4b6Seschrock err = dsl_dataset_open_obj(dp, 316fa9e4066Sahrens ds->ds_phys->ds_prev_snap_obj, NULL, 317ea8dc4b6Seschrock DS_MODE_NONE, ds, &ds->ds_prev); 318fa9e4066Sahrens } 319fa9e4066Sahrens } else { 320fa9e4066Sahrens if (snapname) { 321fa9e4066Sahrens #ifdef ZFS_DEBUG 322fa9e4066Sahrens dsl_dataset_phys_t *headphys; 323ea8dc4b6Seschrock dmu_buf_t *headdbuf; 324ea8dc4b6Seschrock err = dmu_bonus_hold(mos, 325ea8dc4b6Seschrock ds->ds_dir->dd_phys->dd_head_dataset_obj, 326ea8dc4b6Seschrock FTAG, &headdbuf); 327ea8dc4b6Seschrock if (err == 0) { 328ea8dc4b6Seschrock headphys = headdbuf->db_data; 329ea8dc4b6Seschrock uint64_t foundobj; 330ea8dc4b6Seschrock err = zap_lookup(dp->dp_meta_objset, 331ea8dc4b6Seschrock headphys->ds_snapnames_zapobj, 332ea8dc4b6Seschrock snapname, sizeof (foundobj), 1, 333ea8dc4b6Seschrock &foundobj); 334ea8dc4b6Seschrock ASSERT3U(foundobj, ==, dsobj); 335ea8dc4b6Seschrock dmu_buf_rele(headdbuf, FTAG); 336ea8dc4b6Seschrock } 337fa9e4066Sahrens #endif 338fa9e4066Sahrens (void) strcat(ds->ds_snapname, snapname); 339fa9e4066Sahrens } else if (zfs_flags & ZFS_DEBUG_SNAPNAMES) { 340ea8dc4b6Seschrock err = dsl_dataset_get_snapname(ds); 341fa9e4066Sahrens } 342fa9e4066Sahrens } 343fa9e4066Sahrens 344ea8dc4b6Seschrock if (err == 0) { 345ea8dc4b6Seschrock winner = dmu_buf_set_user_ie(dbuf, ds, &ds->ds_phys, 346ea8dc4b6Seschrock dsl_dataset_evict); 347ea8dc4b6Seschrock } 348ea8dc4b6Seschrock if (err || winner) { 349fa9e4066Sahrens bplist_close(&ds->ds_deadlist); 350fa9e4066Sahrens if (ds->ds_prev) { 351fa9e4066Sahrens dsl_dataset_close(ds->ds_prev, 352fa9e4066Sahrens DS_MODE_NONE, ds); 353fa9e4066Sahrens } 354fa9e4066Sahrens dsl_dir_close(ds->ds_dir, ds); 355*5ad82045Snd mutex_destroy(&ds->ds_lock); 356*5ad82045Snd mutex_destroy(&ds->ds_deadlist.bpl_lock); 357fa9e4066Sahrens kmem_free(ds, sizeof (dsl_dataset_t)); 358ea8dc4b6Seschrock if (err) { 359ea8dc4b6Seschrock dmu_buf_rele(dbuf, tag); 360ea8dc4b6Seschrock return (err); 361ea8dc4b6Seschrock } 362fa9e4066Sahrens ds = winner; 363fa9e4066Sahrens } else { 364fa9e4066Sahrens uint64_t new = 365fa9e4066Sahrens unique_insert(ds->ds_phys->ds_fsid_guid); 366fa9e4066Sahrens if (new != ds->ds_phys->ds_fsid_guid) { 367fa9e4066Sahrens /* XXX it won't necessarily be synced... */ 368fa9e4066Sahrens ds->ds_phys->ds_fsid_guid = new; 369fa9e4066Sahrens } 370fa9e4066Sahrens } 371fa9e4066Sahrens } 372fa9e4066Sahrens ASSERT3P(ds->ds_dbuf, ==, dbuf); 373fa9e4066Sahrens ASSERT3P(ds->ds_phys, ==, dbuf->db_data); 374fa9e4066Sahrens 375fa9e4066Sahrens mutex_enter(&ds->ds_lock); 376fa9e4066Sahrens if ((DS_MODE_LEVEL(mode) == DS_MODE_PRIMARY && 37799653d4eSeschrock (ds->ds_phys->ds_flags & DS_FLAG_INCONSISTENT) && 37899653d4eSeschrock !DS_MODE_IS_INCONSISTENT(mode)) || 379fa9e4066Sahrens (ds->ds_open_refcount + weight > DOS_REF_MAX)) { 380fa9e4066Sahrens mutex_exit(&ds->ds_lock); 381fa9e4066Sahrens dsl_dataset_close(ds, DS_MODE_NONE, tag); 382ea8dc4b6Seschrock return (EBUSY); 383fa9e4066Sahrens } 384fa9e4066Sahrens ds->ds_open_refcount += weight; 385fa9e4066Sahrens mutex_exit(&ds->ds_lock); 386fa9e4066Sahrens 387ea8dc4b6Seschrock *dsp = ds; 388ea8dc4b6Seschrock return (0); 389fa9e4066Sahrens } 390fa9e4066Sahrens 391fa9e4066Sahrens int 392fa9e4066Sahrens dsl_dataset_open_spa(spa_t *spa, const char *name, int mode, 393fa9e4066Sahrens void *tag, dsl_dataset_t **dsp) 394fa9e4066Sahrens { 395fa9e4066Sahrens dsl_dir_t *dd; 396fa9e4066Sahrens dsl_pool_t *dp; 397fa9e4066Sahrens const char *tail; 398fa9e4066Sahrens uint64_t obj; 399fa9e4066Sahrens dsl_dataset_t *ds = NULL; 400fa9e4066Sahrens int err = 0; 401fa9e4066Sahrens 402ea8dc4b6Seschrock err = dsl_dir_open_spa(spa, name, FTAG, &dd, &tail); 403ea8dc4b6Seschrock if (err) 404ea8dc4b6Seschrock return (err); 405fa9e4066Sahrens 406fa9e4066Sahrens dp = dd->dd_pool; 407fa9e4066Sahrens obj = dd->dd_phys->dd_head_dataset_obj; 408fa9e4066Sahrens rw_enter(&dp->dp_config_rwlock, RW_READER); 409fa9e4066Sahrens if (obj == 0) { 410fa9e4066Sahrens /* A dataset with no associated objset */ 411fa9e4066Sahrens err = ENOENT; 412fa9e4066Sahrens goto out; 413fa9e4066Sahrens } 414fa9e4066Sahrens 415fa9e4066Sahrens if (tail != NULL) { 416fa9e4066Sahrens objset_t *mos = dp->dp_meta_objset; 417fa9e4066Sahrens 418ea8dc4b6Seschrock err = dsl_dataset_open_obj(dp, obj, NULL, 419ea8dc4b6Seschrock DS_MODE_NONE, tag, &ds); 420ea8dc4b6Seschrock if (err) 421ea8dc4b6Seschrock goto out; 422fa9e4066Sahrens obj = ds->ds_phys->ds_snapnames_zapobj; 423fa9e4066Sahrens dsl_dataset_close(ds, DS_MODE_NONE, tag); 424fa9e4066Sahrens ds = NULL; 425fa9e4066Sahrens 426fa9e4066Sahrens if (tail[0] != '@') { 427fa9e4066Sahrens err = ENOENT; 428fa9e4066Sahrens goto out; 429fa9e4066Sahrens } 430fa9e4066Sahrens tail++; 431fa9e4066Sahrens 432fa9e4066Sahrens /* Look for a snapshot */ 433fa9e4066Sahrens if (!DS_MODE_IS_READONLY(mode)) { 434fa9e4066Sahrens err = EROFS; 435fa9e4066Sahrens goto out; 436fa9e4066Sahrens } 437fa9e4066Sahrens dprintf("looking for snapshot '%s'\n", tail); 438fa9e4066Sahrens err = zap_lookup(mos, obj, tail, 8, 1, &obj); 439fa9e4066Sahrens if (err) 440fa9e4066Sahrens goto out; 441fa9e4066Sahrens } 442ea8dc4b6Seschrock err = dsl_dataset_open_obj(dp, obj, tail, mode, tag, &ds); 443fa9e4066Sahrens 444fa9e4066Sahrens out: 445fa9e4066Sahrens rw_exit(&dp->dp_config_rwlock); 446fa9e4066Sahrens dsl_dir_close(dd, FTAG); 447fa9e4066Sahrens 448fa9e4066Sahrens ASSERT3U((err == 0), ==, (ds != NULL)); 449fa9e4066Sahrens /* ASSERT(ds == NULL || strcmp(name, ds->ds_name) == 0); */ 450fa9e4066Sahrens 451fa9e4066Sahrens *dsp = ds; 452fa9e4066Sahrens return (err); 453fa9e4066Sahrens } 454fa9e4066Sahrens 455fa9e4066Sahrens int 456fa9e4066Sahrens dsl_dataset_open(const char *name, int mode, void *tag, dsl_dataset_t **dsp) 457fa9e4066Sahrens { 458fa9e4066Sahrens return (dsl_dataset_open_spa(NULL, name, mode, tag, dsp)); 459fa9e4066Sahrens } 460fa9e4066Sahrens 461fa9e4066Sahrens void 462fa9e4066Sahrens dsl_dataset_name(dsl_dataset_t *ds, char *name) 463fa9e4066Sahrens { 464fa9e4066Sahrens if (ds == NULL) { 465fa9e4066Sahrens (void) strcpy(name, "mos"); 466fa9e4066Sahrens } else { 467fa9e4066Sahrens dsl_dir_name(ds->ds_dir, name); 468ea8dc4b6Seschrock VERIFY(0 == dsl_dataset_get_snapname(ds)); 469fa9e4066Sahrens if (ds->ds_snapname[0]) { 470fa9e4066Sahrens (void) strcat(name, "@"); 471fa9e4066Sahrens if (!MUTEX_HELD(&ds->ds_lock)) { 472fa9e4066Sahrens /* 473fa9e4066Sahrens * We use a "recursive" mutex so that we 474fa9e4066Sahrens * can call dprintf_ds() with ds_lock held. 475fa9e4066Sahrens */ 476fa9e4066Sahrens mutex_enter(&ds->ds_lock); 477fa9e4066Sahrens (void) strcat(name, ds->ds_snapname); 478fa9e4066Sahrens mutex_exit(&ds->ds_lock); 479fa9e4066Sahrens } else { 480fa9e4066Sahrens (void) strcat(name, ds->ds_snapname); 481fa9e4066Sahrens } 482fa9e4066Sahrens } 483fa9e4066Sahrens } 484fa9e4066Sahrens } 485fa9e4066Sahrens 486fa9e4066Sahrens void 487fa9e4066Sahrens dsl_dataset_close(dsl_dataset_t *ds, int mode, void *tag) 488fa9e4066Sahrens { 489fa9e4066Sahrens uint64_t weight = ds_refcnt_weight[DS_MODE_LEVEL(mode)]; 490fa9e4066Sahrens mutex_enter(&ds->ds_lock); 491fa9e4066Sahrens ASSERT3U(ds->ds_open_refcount, >=, weight); 492fa9e4066Sahrens ds->ds_open_refcount -= weight; 493fa9e4066Sahrens dprintf_ds(ds, "closing mode %u refcount now 0x%llx\n", 494fa9e4066Sahrens mode, ds->ds_open_refcount); 495fa9e4066Sahrens mutex_exit(&ds->ds_lock); 496fa9e4066Sahrens 497ea8dc4b6Seschrock dmu_buf_rele(ds->ds_dbuf, tag); 498fa9e4066Sahrens } 499fa9e4066Sahrens 500fa9e4066Sahrens void 501fa9e4066Sahrens dsl_dataset_create_root(dsl_pool_t *dp, uint64_t *ddobjp, dmu_tx_t *tx) 502fa9e4066Sahrens { 503fa9e4066Sahrens objset_t *mos = dp->dp_meta_objset; 504fa9e4066Sahrens dmu_buf_t *dbuf; 505fa9e4066Sahrens dsl_dataset_phys_t *dsphys; 506fa9e4066Sahrens dsl_dataset_t *ds; 507fa9e4066Sahrens uint64_t dsobj; 508fa9e4066Sahrens dsl_dir_t *dd; 509fa9e4066Sahrens 510fa9e4066Sahrens dsl_dir_create_root(mos, ddobjp, tx); 511ea8dc4b6Seschrock VERIFY(0 == dsl_dir_open_obj(dp, *ddobjp, NULL, FTAG, &dd)); 512fa9e4066Sahrens 5131649cd4bStabriz dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 5141649cd4bStabriz DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 515ea8dc4b6Seschrock VERIFY(0 == dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 516fa9e4066Sahrens dmu_buf_will_dirty(dbuf, tx); 517fa9e4066Sahrens dsphys = dbuf->db_data; 518fa9e4066Sahrens dsphys->ds_dir_obj = dd->dd_object; 519fa9e4066Sahrens dsphys->ds_fsid_guid = unique_create(); 520ea8dc4b6Seschrock unique_remove(dsphys->ds_fsid_guid); /* it isn't open yet */ 521fa9e4066Sahrens (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 522fa9e4066Sahrens sizeof (dsphys->ds_guid)); 523fa9e4066Sahrens dsphys->ds_snapnames_zapobj = 52487e5029aSahrens zap_create(mos, DMU_OT_DSL_DS_SNAP_MAP, DMU_OT_NONE, 0, tx); 525fa9e4066Sahrens dsphys->ds_creation_time = gethrestime_sec(); 526fa9e4066Sahrens dsphys->ds_creation_txg = tx->tx_txg; 527fa9e4066Sahrens dsphys->ds_deadlist_obj = 528fa9e4066Sahrens bplist_create(mos, DSL_DEADLIST_BLOCKSIZE, tx); 529ea8dc4b6Seschrock dmu_buf_rele(dbuf, FTAG); 530fa9e4066Sahrens 531fa9e4066Sahrens dmu_buf_will_dirty(dd->dd_dbuf, tx); 532fa9e4066Sahrens dd->dd_phys->dd_head_dataset_obj = dsobj; 533fa9e4066Sahrens dsl_dir_close(dd, FTAG); 534fa9e4066Sahrens 535ea8dc4b6Seschrock VERIFY(0 == 536ea8dc4b6Seschrock dsl_dataset_open_obj(dp, dsobj, NULL, DS_MODE_NONE, FTAG, &ds)); 537fa9e4066Sahrens (void) dmu_objset_create_impl(dp->dp_spa, ds, DMU_OST_ZFS, tx); 538fa9e4066Sahrens dsl_dataset_close(ds, DS_MODE_NONE, FTAG); 539fa9e4066Sahrens } 540fa9e4066Sahrens 5411d452cf5Sahrens uint64_t 5421d452cf5Sahrens dsl_dataset_create_sync(dsl_dir_t *pdd, 543fa9e4066Sahrens const char *lastname, dsl_dataset_t *clone_parent, dmu_tx_t *tx) 544fa9e4066Sahrens { 5451d452cf5Sahrens dsl_pool_t *dp = pdd->dd_pool; 546fa9e4066Sahrens dmu_buf_t *dbuf; 547fa9e4066Sahrens dsl_dataset_phys_t *dsphys; 5481d452cf5Sahrens uint64_t dsobj, ddobj; 549fa9e4066Sahrens objset_t *mos = dp->dp_meta_objset; 550fa9e4066Sahrens dsl_dir_t *dd; 551fa9e4066Sahrens 5521d452cf5Sahrens ASSERT(clone_parent == NULL || clone_parent->ds_dir->dd_pool == dp); 5531d452cf5Sahrens ASSERT(clone_parent == NULL || 5541d452cf5Sahrens clone_parent->ds_phys->ds_num_children > 0); 555fa9e4066Sahrens ASSERT(lastname[0] != '@'); 556fa9e4066Sahrens ASSERT(dmu_tx_is_syncing(tx)); 557fa9e4066Sahrens 5581d452cf5Sahrens ddobj = dsl_dir_create_sync(pdd, lastname, tx); 5591d452cf5Sahrens VERIFY(0 == dsl_dir_open_obj(dp, ddobj, lastname, FTAG, &dd)); 560fa9e4066Sahrens 5611649cd4bStabriz dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 5621649cd4bStabriz DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 563ea8dc4b6Seschrock VERIFY(0 == dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 564fa9e4066Sahrens dmu_buf_will_dirty(dbuf, tx); 565fa9e4066Sahrens dsphys = dbuf->db_data; 566fa9e4066Sahrens dsphys->ds_dir_obj = dd->dd_object; 567fa9e4066Sahrens dsphys->ds_fsid_guid = unique_create(); 568fa9e4066Sahrens unique_remove(dsphys->ds_fsid_guid); /* it isn't open yet */ 569fa9e4066Sahrens (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 570fa9e4066Sahrens sizeof (dsphys->ds_guid)); 571fa9e4066Sahrens dsphys->ds_snapnames_zapobj = 57287e5029aSahrens zap_create(mos, DMU_OT_DSL_DS_SNAP_MAP, DMU_OT_NONE, 0, tx); 573fa9e4066Sahrens dsphys->ds_creation_time = gethrestime_sec(); 574fa9e4066Sahrens dsphys->ds_creation_txg = tx->tx_txg; 575fa9e4066Sahrens dsphys->ds_deadlist_obj = 576fa9e4066Sahrens bplist_create(mos, DSL_DEADLIST_BLOCKSIZE, tx); 577fa9e4066Sahrens if (clone_parent) { 578fa9e4066Sahrens dsphys->ds_prev_snap_obj = clone_parent->ds_object; 579fa9e4066Sahrens dsphys->ds_prev_snap_txg = 580fa9e4066Sahrens clone_parent->ds_phys->ds_creation_txg; 581fa9e4066Sahrens dsphys->ds_used_bytes = 582fa9e4066Sahrens clone_parent->ds_phys->ds_used_bytes; 583fa9e4066Sahrens dsphys->ds_compressed_bytes = 584fa9e4066Sahrens clone_parent->ds_phys->ds_compressed_bytes; 585fa9e4066Sahrens dsphys->ds_uncompressed_bytes = 586fa9e4066Sahrens clone_parent->ds_phys->ds_uncompressed_bytes; 587fa9e4066Sahrens dsphys->ds_bp = clone_parent->ds_phys->ds_bp; 588fa9e4066Sahrens 589fa9e4066Sahrens dmu_buf_will_dirty(clone_parent->ds_dbuf, tx); 590fa9e4066Sahrens clone_parent->ds_phys->ds_num_children++; 591fa9e4066Sahrens 592fa9e4066Sahrens dmu_buf_will_dirty(dd->dd_dbuf, tx); 593fa9e4066Sahrens dd->dd_phys->dd_clone_parent_obj = clone_parent->ds_object; 594fa9e4066Sahrens } 595ea8dc4b6Seschrock dmu_buf_rele(dbuf, FTAG); 596fa9e4066Sahrens 597fa9e4066Sahrens dmu_buf_will_dirty(dd->dd_dbuf, tx); 598fa9e4066Sahrens dd->dd_phys->dd_head_dataset_obj = dsobj; 599fa9e4066Sahrens dsl_dir_close(dd, FTAG); 600fa9e4066Sahrens 6011d452cf5Sahrens return (dsobj); 602fa9e4066Sahrens } 603fa9e4066Sahrens 6041d452cf5Sahrens struct destroyarg { 6051d452cf5Sahrens dsl_sync_task_group_t *dstg; 6061d452cf5Sahrens char *snapname; 6071d452cf5Sahrens void *tag; 6081d452cf5Sahrens char *failed; 6091d452cf5Sahrens }; 6101d452cf5Sahrens 6111d452cf5Sahrens static int 6121d452cf5Sahrens dsl_snapshot_destroy_one(char *name, void *arg) 613fa9e4066Sahrens { 6141d452cf5Sahrens struct destroyarg *da = arg; 6151d452cf5Sahrens dsl_dataset_t *ds; 6161d452cf5Sahrens char *cp; 617fa9e4066Sahrens int err; 618fa9e4066Sahrens 6191d452cf5Sahrens (void) strcat(name, "@"); 6201d452cf5Sahrens (void) strcat(name, da->snapname); 6211d452cf5Sahrens err = dsl_dataset_open(name, 6221d452cf5Sahrens DS_MODE_EXCLUSIVE | DS_MODE_READONLY | DS_MODE_INCONSISTENT, 6231d452cf5Sahrens da->tag, &ds); 6241d452cf5Sahrens cp = strchr(name, '@'); 6251d452cf5Sahrens *cp = '\0'; 6261d452cf5Sahrens if (err == ENOENT) 6271d452cf5Sahrens return (0); 6281d452cf5Sahrens if (err) { 6291d452cf5Sahrens (void) strcpy(da->failed, name); 630ea8dc4b6Seschrock return (err); 6311d452cf5Sahrens } 632fa9e4066Sahrens 6331d452cf5Sahrens dsl_sync_task_create(da->dstg, dsl_dataset_destroy_check, 6341d452cf5Sahrens dsl_dataset_destroy_sync, ds, da->tag, 0); 6351d452cf5Sahrens return (0); 6361d452cf5Sahrens } 63731fd60d3Sahrens 6381d452cf5Sahrens /* 6391d452cf5Sahrens * Destroy 'snapname' in all descendants of 'fsname'. 6401d452cf5Sahrens */ 6411d452cf5Sahrens #pragma weak dmu_snapshots_destroy = dsl_snapshots_destroy 6421d452cf5Sahrens int 6431d452cf5Sahrens dsl_snapshots_destroy(char *fsname, char *snapname) 6441d452cf5Sahrens { 6451d452cf5Sahrens int err; 6461d452cf5Sahrens struct destroyarg da; 6471d452cf5Sahrens dsl_sync_task_t *dst; 6481d452cf5Sahrens spa_t *spa; 6491d452cf5Sahrens char *cp; 6501d452cf5Sahrens 6511d452cf5Sahrens cp = strchr(fsname, '/'); 6521d452cf5Sahrens if (cp) { 6531d452cf5Sahrens *cp = '\0'; 6541d452cf5Sahrens err = spa_open(fsname, &spa, FTAG); 6551d452cf5Sahrens *cp = '/'; 6561d452cf5Sahrens } else { 6571d452cf5Sahrens err = spa_open(fsname, &spa, FTAG); 6581d452cf5Sahrens } 6591d452cf5Sahrens if (err) 6601d452cf5Sahrens return (err); 6611d452cf5Sahrens da.dstg = dsl_sync_task_group_create(spa_get_dsl(spa)); 6621d452cf5Sahrens da.snapname = snapname; 6631d452cf5Sahrens da.tag = FTAG; 6641d452cf5Sahrens da.failed = fsname; 6651d452cf5Sahrens 6661d452cf5Sahrens err = dmu_objset_find(fsname, 6670b69c2f0Sahrens dsl_snapshot_destroy_one, &da, DS_FIND_CHILDREN); 6681d452cf5Sahrens 6691d452cf5Sahrens if (err == 0) 6701d452cf5Sahrens err = dsl_sync_task_group_wait(da.dstg); 6711d452cf5Sahrens 6721d452cf5Sahrens for (dst = list_head(&da.dstg->dstg_tasks); dst; 6731d452cf5Sahrens dst = list_next(&da.dstg->dstg_tasks, dst)) { 6741d452cf5Sahrens dsl_dataset_t *ds = dst->dst_arg1; 6751d452cf5Sahrens if (dst->dst_err) { 6761d452cf5Sahrens dsl_dataset_name(ds, fsname); 6771d452cf5Sahrens cp = strchr(fsname, '@'); 6781d452cf5Sahrens *cp = '\0'; 679e1930233Sbonwick } 680fa9e4066Sahrens /* 6811d452cf5Sahrens * If it was successful, destroy_sync would have 6821d452cf5Sahrens * closed the ds 683fa9e4066Sahrens */ 684ea8dc4b6Seschrock if (err) 6851d452cf5Sahrens dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG); 686fa9e4066Sahrens } 687fa9e4066Sahrens 6881d452cf5Sahrens dsl_sync_task_group_destroy(da.dstg); 6891d452cf5Sahrens spa_close(spa, FTAG); 690fa9e4066Sahrens return (err); 691fa9e4066Sahrens } 692fa9e4066Sahrens 693fa9e4066Sahrens int 6941d452cf5Sahrens dsl_dataset_destroy(const char *name) 695fa9e4066Sahrens { 696fa9e4066Sahrens int err; 6971d452cf5Sahrens dsl_sync_task_group_t *dstg; 6981d452cf5Sahrens objset_t *os; 6991d452cf5Sahrens dsl_dataset_t *ds; 700fa9e4066Sahrens dsl_dir_t *dd; 7011d452cf5Sahrens uint64_t obj; 7021d452cf5Sahrens 7031d452cf5Sahrens if (strchr(name, '@')) { 7041d452cf5Sahrens /* Destroying a snapshot is simpler */ 7051d452cf5Sahrens err = dsl_dataset_open(name, 7061d452cf5Sahrens DS_MODE_EXCLUSIVE | DS_MODE_READONLY | DS_MODE_INCONSISTENT, 7071d452cf5Sahrens FTAG, &ds); 7081d452cf5Sahrens if (err) 7091d452cf5Sahrens return (err); 7101d452cf5Sahrens err = dsl_sync_task_do(ds->ds_dir->dd_pool, 7111d452cf5Sahrens dsl_dataset_destroy_check, dsl_dataset_destroy_sync, 7121d452cf5Sahrens ds, FTAG, 0); 7131d452cf5Sahrens if (err) 7141d452cf5Sahrens dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG); 7151d452cf5Sahrens return (err); 7161d452cf5Sahrens } 717fa9e4066Sahrens 7181d452cf5Sahrens err = dmu_objset_open(name, DMU_OST_ANY, 7191d452cf5Sahrens DS_MODE_EXCLUSIVE | DS_MODE_INCONSISTENT, &os); 720ea8dc4b6Seschrock if (err) 721ea8dc4b6Seschrock return (err); 7221d452cf5Sahrens ds = os->os->os_dsl_dataset; 7231d452cf5Sahrens dd = ds->ds_dir; 724fa9e4066Sahrens 7251d452cf5Sahrens /* 7261d452cf5Sahrens * Check for errors and mark this ds as inconsistent, in 7271d452cf5Sahrens * case we crash while freeing the objects. 7281d452cf5Sahrens */ 7291d452cf5Sahrens err = dsl_sync_task_do(dd->dd_pool, dsl_dataset_destroy_begin_check, 7301d452cf5Sahrens dsl_dataset_destroy_begin_sync, ds, NULL, 0); 7311d452cf5Sahrens if (err) { 7321d452cf5Sahrens dmu_objset_close(os); 7331d452cf5Sahrens return (err); 734fa9e4066Sahrens } 735fa9e4066Sahrens 7361d452cf5Sahrens /* 7371d452cf5Sahrens * remove the objects in open context, so that we won't 7381d452cf5Sahrens * have too much to do in syncing context. 7391d452cf5Sahrens */ 7401d452cf5Sahrens for (obj = 0; err == 0; 7411d452cf5Sahrens err = dmu_object_next(os, &obj, FALSE)) { 7421d452cf5Sahrens dmu_tx_t *tx = dmu_tx_create(os); 7431d452cf5Sahrens dmu_tx_hold_free(tx, obj, 0, DMU_OBJECT_END); 7441d452cf5Sahrens dmu_tx_hold_bonus(tx, obj); 7451d452cf5Sahrens err = dmu_tx_assign(tx, TXG_WAIT); 7461d452cf5Sahrens if (err) { 7471d452cf5Sahrens /* 7481d452cf5Sahrens * Perhaps there is not enough disk 7491d452cf5Sahrens * space. Just deal with it from 7501d452cf5Sahrens * dsl_dataset_destroy_sync(). 7511d452cf5Sahrens */ 7521d452cf5Sahrens dmu_tx_abort(tx); 7531d452cf5Sahrens continue; 7541d452cf5Sahrens } 7551d452cf5Sahrens VERIFY(0 == dmu_object_free(os, obj, tx)); 7561d452cf5Sahrens dmu_tx_commit(tx); 7571d452cf5Sahrens } 7581d452cf5Sahrens /* Make sure it's not dirty before we finish destroying it. */ 7591d452cf5Sahrens txg_wait_synced(dd->dd_pool, 0); 7601d452cf5Sahrens 7611d452cf5Sahrens dmu_objset_close(os); 7621d452cf5Sahrens if (err != ESRCH) 7631d452cf5Sahrens return (err); 7641d452cf5Sahrens 7651d452cf5Sahrens err = dsl_dataset_open(name, 7661d452cf5Sahrens DS_MODE_EXCLUSIVE | DS_MODE_READONLY | DS_MODE_INCONSISTENT, 7671d452cf5Sahrens FTAG, &ds); 7681d452cf5Sahrens if (err) 7691d452cf5Sahrens return (err); 7701d452cf5Sahrens 7711d452cf5Sahrens err = dsl_dir_open(name, FTAG, &dd, NULL); 7721d452cf5Sahrens if (err) { 7731d452cf5Sahrens dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG); 7741d452cf5Sahrens return (err); 7751d452cf5Sahrens } 7761d452cf5Sahrens 7771d452cf5Sahrens /* 7781d452cf5Sahrens * Blow away the dsl_dir + head dataset. 7791d452cf5Sahrens */ 7801d452cf5Sahrens dstg = dsl_sync_task_group_create(ds->ds_dir->dd_pool); 7811d452cf5Sahrens dsl_sync_task_create(dstg, dsl_dataset_destroy_check, 7821d452cf5Sahrens dsl_dataset_destroy_sync, ds, FTAG, 0); 7831d452cf5Sahrens dsl_sync_task_create(dstg, dsl_dir_destroy_check, 7841d452cf5Sahrens dsl_dir_destroy_sync, dd, FTAG, 0); 7851d452cf5Sahrens err = dsl_sync_task_group_wait(dstg); 7861d452cf5Sahrens dsl_sync_task_group_destroy(dstg); 7871d452cf5Sahrens /* if it is successful, *destroy_sync will close the ds+dd */ 7881d452cf5Sahrens if (err) { 7891d452cf5Sahrens dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG); 7901d452cf5Sahrens dsl_dir_close(dd, FTAG); 7911d452cf5Sahrens } 792fa9e4066Sahrens return (err); 793fa9e4066Sahrens } 794fa9e4066Sahrens 7951d452cf5Sahrens int 7961d452cf5Sahrens dsl_dataset_rollback(dsl_dataset_t *ds) 7971d452cf5Sahrens { 7981d452cf5Sahrens ASSERT3U(ds->ds_open_refcount, ==, DOS_REF_MAX); 7991d452cf5Sahrens return (dsl_sync_task_do(ds->ds_dir->dd_pool, 8001d452cf5Sahrens dsl_dataset_rollback_check, dsl_dataset_rollback_sync, 8011d452cf5Sahrens ds, NULL, 0)); 8021d452cf5Sahrens } 8031d452cf5Sahrens 804fa9e4066Sahrens void * 805fa9e4066Sahrens dsl_dataset_set_user_ptr(dsl_dataset_t *ds, 806fa9e4066Sahrens void *p, dsl_dataset_evict_func_t func) 807fa9e4066Sahrens { 808fa9e4066Sahrens void *old; 809fa9e4066Sahrens 810fa9e4066Sahrens mutex_enter(&ds->ds_lock); 811fa9e4066Sahrens old = ds->ds_user_ptr; 812fa9e4066Sahrens if (old == NULL) { 813fa9e4066Sahrens ds->ds_user_ptr = p; 814fa9e4066Sahrens ds->ds_user_evict_func = func; 815fa9e4066Sahrens } 816fa9e4066Sahrens mutex_exit(&ds->ds_lock); 817fa9e4066Sahrens return (old); 818fa9e4066Sahrens } 819fa9e4066Sahrens 820fa9e4066Sahrens void * 821fa9e4066Sahrens dsl_dataset_get_user_ptr(dsl_dataset_t *ds) 822fa9e4066Sahrens { 823fa9e4066Sahrens return (ds->ds_user_ptr); 824fa9e4066Sahrens } 825fa9e4066Sahrens 826fa9e4066Sahrens 827fa9e4066Sahrens void 828fa9e4066Sahrens dsl_dataset_get_blkptr(dsl_dataset_t *ds, blkptr_t *bp) 829fa9e4066Sahrens { 830fa9e4066Sahrens *bp = ds->ds_phys->ds_bp; 831fa9e4066Sahrens } 832fa9e4066Sahrens 833fa9e4066Sahrens void 834fa9e4066Sahrens dsl_dataset_set_blkptr(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx) 835fa9e4066Sahrens { 836fa9e4066Sahrens ASSERT(dmu_tx_is_syncing(tx)); 837fa9e4066Sahrens /* If it's the meta-objset, set dp_meta_rootbp */ 838fa9e4066Sahrens if (ds == NULL) { 839fa9e4066Sahrens tx->tx_pool->dp_meta_rootbp = *bp; 840fa9e4066Sahrens } else { 841fa9e4066Sahrens dmu_buf_will_dirty(ds->ds_dbuf, tx); 842fa9e4066Sahrens ds->ds_phys->ds_bp = *bp; 843fa9e4066Sahrens } 844fa9e4066Sahrens } 845fa9e4066Sahrens 846fa9e4066Sahrens spa_t * 847fa9e4066Sahrens dsl_dataset_get_spa(dsl_dataset_t *ds) 848fa9e4066Sahrens { 849fa9e4066Sahrens return (ds->ds_dir->dd_pool->dp_spa); 850fa9e4066Sahrens } 851fa9e4066Sahrens 852fa9e4066Sahrens void 853fa9e4066Sahrens dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx) 854fa9e4066Sahrens { 855fa9e4066Sahrens dsl_pool_t *dp; 856fa9e4066Sahrens 857fa9e4066Sahrens if (ds == NULL) /* this is the meta-objset */ 858fa9e4066Sahrens return; 859fa9e4066Sahrens 860fa9e4066Sahrens ASSERT(ds->ds_user_ptr != NULL); 861fa9e4066Sahrens ASSERT(ds->ds_phys->ds_next_snap_obj == 0); 862fa9e4066Sahrens 863fa9e4066Sahrens dp = ds->ds_dir->dd_pool; 864fa9e4066Sahrens 865fa9e4066Sahrens if (txg_list_add(&dp->dp_dirty_datasets, ds, tx->tx_txg) == 0) { 866fa9e4066Sahrens /* up the hold count until we can be written out */ 867fa9e4066Sahrens dmu_buf_add_ref(ds->ds_dbuf, ds); 868fa9e4066Sahrens } 869fa9e4066Sahrens } 870fa9e4066Sahrens 871fa9e4066Sahrens struct killarg { 872fa9e4066Sahrens uint64_t *usedp; 873fa9e4066Sahrens uint64_t *compressedp; 874fa9e4066Sahrens uint64_t *uncompressedp; 875fa9e4066Sahrens zio_t *zio; 876fa9e4066Sahrens dmu_tx_t *tx; 877fa9e4066Sahrens }; 878fa9e4066Sahrens 879fa9e4066Sahrens static int 880fa9e4066Sahrens kill_blkptr(traverse_blk_cache_t *bc, spa_t *spa, void *arg) 881fa9e4066Sahrens { 882fa9e4066Sahrens struct killarg *ka = arg; 883fa9e4066Sahrens blkptr_t *bp = &bc->bc_blkptr; 884fa9e4066Sahrens 885fa9e4066Sahrens ASSERT3U(bc->bc_errno, ==, 0); 886fa9e4066Sahrens 887fa9e4066Sahrens /* 888fa9e4066Sahrens * Since this callback is not called concurrently, no lock is 889fa9e4066Sahrens * needed on the accounting values. 890fa9e4066Sahrens */ 89199653d4eSeschrock *ka->usedp += bp_get_dasize(spa, bp); 892fa9e4066Sahrens *ka->compressedp += BP_GET_PSIZE(bp); 893fa9e4066Sahrens *ka->uncompressedp += BP_GET_UCSIZE(bp); 894fa9e4066Sahrens /* XXX check for EIO? */ 895fa9e4066Sahrens (void) arc_free(ka->zio, spa, ka->tx->tx_txg, bp, NULL, NULL, 896fa9e4066Sahrens ARC_NOWAIT); 897fa9e4066Sahrens return (0); 898fa9e4066Sahrens } 899fa9e4066Sahrens 900fa9e4066Sahrens /* ARGSUSED */ 9011d452cf5Sahrens static int 9021d452cf5Sahrens dsl_dataset_rollback_check(void *arg1, void *arg2, dmu_tx_t *tx) 903fa9e4066Sahrens { 9041d452cf5Sahrens dsl_dataset_t *ds = arg1; 905fa9e4066Sahrens 9061d452cf5Sahrens /* 9071d452cf5Sahrens * There must be a previous snapshot. I suppose we could roll 9081d452cf5Sahrens * it back to being empty (and re-initialize the upper (ZPL) 9091d452cf5Sahrens * layer). But for now there's no way to do this via the user 9101d452cf5Sahrens * interface. 9111d452cf5Sahrens */ 9121d452cf5Sahrens if (ds->ds_phys->ds_prev_snap_txg == 0) 913fa9e4066Sahrens return (EINVAL); 914fa9e4066Sahrens 9151d452cf5Sahrens /* 9161d452cf5Sahrens * This must not be a snapshot. 9171d452cf5Sahrens */ 9181d452cf5Sahrens if (ds->ds_phys->ds_next_snap_obj != 0) 919fa9e4066Sahrens return (EINVAL); 920fa9e4066Sahrens 921fa9e4066Sahrens /* 922fa9e4066Sahrens * If we made changes this txg, traverse_dsl_dataset won't find 923fa9e4066Sahrens * them. Try again. 924fa9e4066Sahrens */ 9251d452cf5Sahrens if (ds->ds_phys->ds_bp.blk_birth >= tx->tx_txg) 926fa9e4066Sahrens return (EAGAIN); 927fa9e4066Sahrens 9281d452cf5Sahrens return (0); 9291d452cf5Sahrens } 9301d452cf5Sahrens 9311d452cf5Sahrens /* ARGSUSED */ 9321d452cf5Sahrens static void 9331d452cf5Sahrens dsl_dataset_rollback_sync(void *arg1, void *arg2, dmu_tx_t *tx) 9341d452cf5Sahrens { 9351d452cf5Sahrens dsl_dataset_t *ds = arg1; 9361d452cf5Sahrens objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 937fa9e4066Sahrens 938fa9e4066Sahrens dmu_buf_will_dirty(ds->ds_dbuf, tx); 939fa9e4066Sahrens 940fa9e4066Sahrens /* Zero out the deadlist. */ 941fa9e4066Sahrens bplist_close(&ds->ds_deadlist); 942fa9e4066Sahrens bplist_destroy(mos, ds->ds_phys->ds_deadlist_obj, tx); 943fa9e4066Sahrens ds->ds_phys->ds_deadlist_obj = 944fa9e4066Sahrens bplist_create(mos, DSL_DEADLIST_BLOCKSIZE, tx); 945ea8dc4b6Seschrock VERIFY(0 == bplist_open(&ds->ds_deadlist, mos, 946ea8dc4b6Seschrock ds->ds_phys->ds_deadlist_obj)); 947fa9e4066Sahrens 948fa9e4066Sahrens { 949fa9e4066Sahrens /* Free blkptrs that we gave birth to */ 950fa9e4066Sahrens zio_t *zio; 951fa9e4066Sahrens uint64_t used = 0, compressed = 0, uncompressed = 0; 952fa9e4066Sahrens struct killarg ka; 953fa9e4066Sahrens 954fa9e4066Sahrens zio = zio_root(tx->tx_pool->dp_spa, NULL, NULL, 955fa9e4066Sahrens ZIO_FLAG_MUSTSUCCEED); 956fa9e4066Sahrens ka.usedp = &used; 957fa9e4066Sahrens ka.compressedp = &compressed; 958fa9e4066Sahrens ka.uncompressedp = &uncompressed; 959fa9e4066Sahrens ka.zio = zio; 960fa9e4066Sahrens ka.tx = tx; 961fa9e4066Sahrens (void) traverse_dsl_dataset(ds, ds->ds_phys->ds_prev_snap_txg, 962fa9e4066Sahrens ADVANCE_POST, kill_blkptr, &ka); 963fa9e4066Sahrens (void) zio_wait(zio); 964fa9e4066Sahrens 9651d452cf5Sahrens dsl_dir_diduse_space(ds->ds_dir, 966fa9e4066Sahrens -used, -compressed, -uncompressed, tx); 967fa9e4066Sahrens } 968fa9e4066Sahrens 9691d452cf5Sahrens /* Change our contents to that of the prev snapshot */ 970fa9e4066Sahrens ASSERT3U(ds->ds_prev->ds_object, ==, ds->ds_phys->ds_prev_snap_obj); 971fa9e4066Sahrens ds->ds_phys->ds_bp = ds->ds_prev->ds_phys->ds_bp; 972fa9e4066Sahrens ds->ds_phys->ds_used_bytes = ds->ds_prev->ds_phys->ds_used_bytes; 973fa9e4066Sahrens ds->ds_phys->ds_compressed_bytes = 974fa9e4066Sahrens ds->ds_prev->ds_phys->ds_compressed_bytes; 975fa9e4066Sahrens ds->ds_phys->ds_uncompressed_bytes = 976fa9e4066Sahrens ds->ds_prev->ds_phys->ds_uncompressed_bytes; 97799653d4eSeschrock ds->ds_phys->ds_flags = ds->ds_prev->ds_phys->ds_flags; 978fa9e4066Sahrens ds->ds_phys->ds_unique_bytes = 0; 979fa9e4066Sahrens 98085edac42Sahrens if (ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object) { 98185edac42Sahrens dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 98285edac42Sahrens ds->ds_prev->ds_phys->ds_unique_bytes = 0; 98385edac42Sahrens } 984fa9e4066Sahrens } 985fa9e4066Sahrens 986e1930233Sbonwick /* ARGSUSED */ 987e1930233Sbonwick static int 9881d452cf5Sahrens dsl_dataset_destroy_begin_check(void *arg1, void *arg2, dmu_tx_t *tx) 989e1930233Sbonwick { 9901d452cf5Sahrens dsl_dataset_t *ds = arg1; 991e1930233Sbonwick 992e1930233Sbonwick /* 993e1930233Sbonwick * Can't delete a head dataset if there are snapshots of it. 994e1930233Sbonwick * (Except if the only snapshots are from the branch we cloned 995e1930233Sbonwick * from.) 996e1930233Sbonwick */ 997e1930233Sbonwick if (ds->ds_prev != NULL && 998e1930233Sbonwick ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object) 999e1930233Sbonwick return (EINVAL); 1000e1930233Sbonwick 1001e1930233Sbonwick return (0); 1002e1930233Sbonwick } 1003e1930233Sbonwick 10041d452cf5Sahrens /* ARGSUSED */ 10051d452cf5Sahrens static void 10061d452cf5Sahrens dsl_dataset_destroy_begin_sync(void *arg1, void *arg2, dmu_tx_t *tx) 1007fa9e4066Sahrens { 10081d452cf5Sahrens dsl_dataset_t *ds = arg1; 1009fa9e4066Sahrens 10101d452cf5Sahrens /* Mark it as inconsistent on-disk, in case we crash */ 10111d452cf5Sahrens dmu_buf_will_dirty(ds->ds_dbuf, tx); 10121d452cf5Sahrens ds->ds_phys->ds_flags |= DS_FLAG_INCONSISTENT; 10131d452cf5Sahrens } 1014fa9e4066Sahrens 10151d452cf5Sahrens /* ARGSUSED */ 10161d452cf5Sahrens static int 10171d452cf5Sahrens dsl_dataset_destroy_check(void *arg1, void *arg2, dmu_tx_t *tx) 10181d452cf5Sahrens { 10191d452cf5Sahrens dsl_dataset_t *ds = arg1; 1020fa9e4066Sahrens 1021fa9e4066Sahrens /* Can't delete a branch point. */ 10221d452cf5Sahrens if (ds->ds_phys->ds_num_children > 1) 10231d452cf5Sahrens return (EEXIST); 1024fa9e4066Sahrens 1025fa9e4066Sahrens /* 1026fa9e4066Sahrens * Can't delete a head dataset if there are snapshots of it. 1027fa9e4066Sahrens * (Except if the only snapshots are from the branch we cloned 1028fa9e4066Sahrens * from.) 1029fa9e4066Sahrens */ 1030fa9e4066Sahrens if (ds->ds_prev != NULL && 10311d452cf5Sahrens ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object) 1032fa9e4066Sahrens return (EINVAL); 1033fa9e4066Sahrens 1034fa9e4066Sahrens /* 1035fa9e4066Sahrens * If we made changes this txg, traverse_dsl_dataset won't find 1036fa9e4066Sahrens * them. Try again. 1037fa9e4066Sahrens */ 10381d452cf5Sahrens if (ds->ds_phys->ds_bp.blk_birth >= tx->tx_txg) 1039fa9e4066Sahrens return (EAGAIN); 10401d452cf5Sahrens 10411d452cf5Sahrens /* XXX we should do some i/o error checking... */ 10421d452cf5Sahrens return (0); 10431d452cf5Sahrens } 10441d452cf5Sahrens 10451d452cf5Sahrens static void 10461d452cf5Sahrens dsl_dataset_destroy_sync(void *arg1, void *tag, dmu_tx_t *tx) 10471d452cf5Sahrens { 10481d452cf5Sahrens dsl_dataset_t *ds = arg1; 10491d452cf5Sahrens uint64_t used = 0, compressed = 0, uncompressed = 0; 10501d452cf5Sahrens zio_t *zio; 10511d452cf5Sahrens int err; 10521d452cf5Sahrens int after_branch_point = FALSE; 10531d452cf5Sahrens dsl_pool_t *dp = ds->ds_dir->dd_pool; 10541d452cf5Sahrens objset_t *mos = dp->dp_meta_objset; 10551d452cf5Sahrens dsl_dataset_t *ds_prev = NULL; 10561d452cf5Sahrens uint64_t obj; 10571d452cf5Sahrens 10581d452cf5Sahrens ASSERT3U(ds->ds_open_refcount, ==, DOS_REF_MAX); 10591d452cf5Sahrens ASSERT3U(ds->ds_phys->ds_num_children, <=, 1); 10601d452cf5Sahrens ASSERT(ds->ds_prev == NULL || 10611d452cf5Sahrens ds->ds_prev->ds_phys->ds_next_snap_obj != ds->ds_object); 10621d452cf5Sahrens ASSERT3U(ds->ds_phys->ds_bp.blk_birth, <=, tx->tx_txg); 10631d452cf5Sahrens 10641d452cf5Sahrens ASSERT(RW_WRITE_HELD(&dp->dp_config_rwlock)); 10651d452cf5Sahrens 10661d452cf5Sahrens obj = ds->ds_object; 1067fa9e4066Sahrens 1068fa9e4066Sahrens if (ds->ds_phys->ds_prev_snap_obj != 0) { 1069fa9e4066Sahrens if (ds->ds_prev) { 1070fa9e4066Sahrens ds_prev = ds->ds_prev; 1071fa9e4066Sahrens } else { 10721d452cf5Sahrens VERIFY(0 == dsl_dataset_open_obj(dp, 1073fa9e4066Sahrens ds->ds_phys->ds_prev_snap_obj, NULL, 10741d452cf5Sahrens DS_MODE_NONE, FTAG, &ds_prev)); 1075fa9e4066Sahrens } 1076fa9e4066Sahrens after_branch_point = 1077fa9e4066Sahrens (ds_prev->ds_phys->ds_next_snap_obj != obj); 1078fa9e4066Sahrens 1079fa9e4066Sahrens dmu_buf_will_dirty(ds_prev->ds_dbuf, tx); 1080fa9e4066Sahrens if (after_branch_point && 1081fa9e4066Sahrens ds->ds_phys->ds_next_snap_obj == 0) { 1082fa9e4066Sahrens /* This clone is toast. */ 1083fa9e4066Sahrens ASSERT(ds_prev->ds_phys->ds_num_children > 1); 1084fa9e4066Sahrens ds_prev->ds_phys->ds_num_children--; 1085fa9e4066Sahrens } else if (!after_branch_point) { 1086fa9e4066Sahrens ds_prev->ds_phys->ds_next_snap_obj = 1087fa9e4066Sahrens ds->ds_phys->ds_next_snap_obj; 1088fa9e4066Sahrens } 1089fa9e4066Sahrens } 1090fa9e4066Sahrens 1091fa9e4066Sahrens zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED); 1092fa9e4066Sahrens 1093fa9e4066Sahrens if (ds->ds_phys->ds_next_snap_obj != 0) { 10941d452cf5Sahrens blkptr_t bp; 1095fa9e4066Sahrens dsl_dataset_t *ds_next; 1096fa9e4066Sahrens uint64_t itor = 0; 1097fa9e4066Sahrens 1098fa9e4066Sahrens spa_scrub_restart(dp->dp_spa, tx->tx_txg); 1099fa9e4066Sahrens 11001d452cf5Sahrens VERIFY(0 == dsl_dataset_open_obj(dp, 1101ea8dc4b6Seschrock ds->ds_phys->ds_next_snap_obj, NULL, 1102ea8dc4b6Seschrock DS_MODE_NONE, FTAG, &ds_next)); 1103fa9e4066Sahrens ASSERT3U(ds_next->ds_phys->ds_prev_snap_obj, ==, obj); 1104fa9e4066Sahrens 1105fa9e4066Sahrens dmu_buf_will_dirty(ds_next->ds_dbuf, tx); 1106fa9e4066Sahrens ds_next->ds_phys->ds_prev_snap_obj = 1107fa9e4066Sahrens ds->ds_phys->ds_prev_snap_obj; 1108fa9e4066Sahrens ds_next->ds_phys->ds_prev_snap_txg = 1109fa9e4066Sahrens ds->ds_phys->ds_prev_snap_txg; 1110fa9e4066Sahrens ASSERT3U(ds->ds_phys->ds_prev_snap_txg, ==, 1111fa9e4066Sahrens ds_prev ? ds_prev->ds_phys->ds_creation_txg : 0); 1112fa9e4066Sahrens 1113fa9e4066Sahrens /* 1114fa9e4066Sahrens * Transfer to our deadlist (which will become next's 1115fa9e4066Sahrens * new deadlist) any entries from next's current 1116fa9e4066Sahrens * deadlist which were born before prev, and free the 1117fa9e4066Sahrens * other entries. 1118fa9e4066Sahrens * 1119fa9e4066Sahrens * XXX we're doing this long task with the config lock held 1120fa9e4066Sahrens */ 1121fa9e4066Sahrens while (bplist_iterate(&ds_next->ds_deadlist, &itor, 1122fa9e4066Sahrens &bp) == 0) { 1123fa9e4066Sahrens if (bp.blk_birth <= ds->ds_phys->ds_prev_snap_txg) { 1124ea8dc4b6Seschrock VERIFY(0 == bplist_enqueue(&ds->ds_deadlist, 1125ea8dc4b6Seschrock &bp, tx)); 1126fa9e4066Sahrens if (ds_prev && !after_branch_point && 1127fa9e4066Sahrens bp.blk_birth > 1128fa9e4066Sahrens ds_prev->ds_phys->ds_prev_snap_txg) { 1129fa9e4066Sahrens ds_prev->ds_phys->ds_unique_bytes += 113099653d4eSeschrock bp_get_dasize(dp->dp_spa, &bp); 1131fa9e4066Sahrens } 1132fa9e4066Sahrens } else { 113399653d4eSeschrock used += bp_get_dasize(dp->dp_spa, &bp); 1134fa9e4066Sahrens compressed += BP_GET_PSIZE(&bp); 1135fa9e4066Sahrens uncompressed += BP_GET_UCSIZE(&bp); 1136fa9e4066Sahrens /* XXX check return value? */ 1137fa9e4066Sahrens (void) arc_free(zio, dp->dp_spa, tx->tx_txg, 1138fa9e4066Sahrens &bp, NULL, NULL, ARC_NOWAIT); 1139fa9e4066Sahrens } 1140fa9e4066Sahrens } 1141fa9e4066Sahrens 1142fa9e4066Sahrens /* free next's deadlist */ 1143fa9e4066Sahrens bplist_close(&ds_next->ds_deadlist); 1144fa9e4066Sahrens bplist_destroy(mos, ds_next->ds_phys->ds_deadlist_obj, tx); 1145fa9e4066Sahrens 1146fa9e4066Sahrens /* set next's deadlist to our deadlist */ 1147fa9e4066Sahrens ds_next->ds_phys->ds_deadlist_obj = 1148fa9e4066Sahrens ds->ds_phys->ds_deadlist_obj; 1149ea8dc4b6Seschrock VERIFY(0 == bplist_open(&ds_next->ds_deadlist, mos, 1150ea8dc4b6Seschrock ds_next->ds_phys->ds_deadlist_obj)); 1151fa9e4066Sahrens ds->ds_phys->ds_deadlist_obj = 0; 1152fa9e4066Sahrens 1153fa9e4066Sahrens if (ds_next->ds_phys->ds_next_snap_obj != 0) { 1154fa9e4066Sahrens /* 1155fa9e4066Sahrens * Update next's unique to include blocks which 1156fa9e4066Sahrens * were previously shared by only this snapshot 1157fa9e4066Sahrens * and it. Those blocks will be born after the 1158fa9e4066Sahrens * prev snap and before this snap, and will have 1159fa9e4066Sahrens * died after the next snap and before the one 1160fa9e4066Sahrens * after that (ie. be on the snap after next's 1161fa9e4066Sahrens * deadlist). 1162fa9e4066Sahrens * 1163fa9e4066Sahrens * XXX we're doing this long task with the 1164fa9e4066Sahrens * config lock held 1165fa9e4066Sahrens */ 1166fa9e4066Sahrens dsl_dataset_t *ds_after_next; 1167fa9e4066Sahrens 11681d452cf5Sahrens VERIFY(0 == dsl_dataset_open_obj(dp, 1169fa9e4066Sahrens ds_next->ds_phys->ds_next_snap_obj, NULL, 1170ea8dc4b6Seschrock DS_MODE_NONE, FTAG, &ds_after_next)); 1171fa9e4066Sahrens itor = 0; 1172fa9e4066Sahrens while (bplist_iterate(&ds_after_next->ds_deadlist, 1173fa9e4066Sahrens &itor, &bp) == 0) { 1174fa9e4066Sahrens if (bp.blk_birth > 1175fa9e4066Sahrens ds->ds_phys->ds_prev_snap_txg && 1176fa9e4066Sahrens bp.blk_birth <= 1177fa9e4066Sahrens ds->ds_phys->ds_creation_txg) { 1178fa9e4066Sahrens ds_next->ds_phys->ds_unique_bytes += 117999653d4eSeschrock bp_get_dasize(dp->dp_spa, &bp); 1180fa9e4066Sahrens } 1181fa9e4066Sahrens } 1182fa9e4066Sahrens 1183fa9e4066Sahrens dsl_dataset_close(ds_after_next, DS_MODE_NONE, FTAG); 1184fa9e4066Sahrens ASSERT3P(ds_next->ds_prev, ==, NULL); 1185fa9e4066Sahrens } else { 1186fa9e4066Sahrens /* 1187fa9e4066Sahrens * It would be nice to update the head dataset's 1188fa9e4066Sahrens * unique. To do so we would have to traverse 1189fa9e4066Sahrens * it for blocks born after ds_prev, which is 1190fa9e4066Sahrens * pretty expensive just to maintain something 1191fa9e4066Sahrens * for debugging purposes. 1192fa9e4066Sahrens */ 1193fa9e4066Sahrens ASSERT3P(ds_next->ds_prev, ==, ds); 1194fa9e4066Sahrens dsl_dataset_close(ds_next->ds_prev, DS_MODE_NONE, 1195fa9e4066Sahrens ds_next); 1196fa9e4066Sahrens if (ds_prev) { 11971d452cf5Sahrens VERIFY(0 == dsl_dataset_open_obj(dp, 1198ea8dc4b6Seschrock ds->ds_phys->ds_prev_snap_obj, NULL, 1199ea8dc4b6Seschrock DS_MODE_NONE, ds_next, &ds_next->ds_prev)); 1200fa9e4066Sahrens } else { 1201fa9e4066Sahrens ds_next->ds_prev = NULL; 1202fa9e4066Sahrens } 1203fa9e4066Sahrens } 1204fa9e4066Sahrens dsl_dataset_close(ds_next, DS_MODE_NONE, FTAG); 1205fa9e4066Sahrens 1206fa9e4066Sahrens /* 1207fa9e4066Sahrens * NB: unique_bytes is not accurate for head objsets 1208fa9e4066Sahrens * because we don't update it when we delete the most 1209fa9e4066Sahrens * recent snapshot -- see above comment. 1210fa9e4066Sahrens */ 1211fa9e4066Sahrens ASSERT3U(used, ==, ds->ds_phys->ds_unique_bytes); 1212fa9e4066Sahrens } else { 1213fa9e4066Sahrens /* 1214fa9e4066Sahrens * There's no next snapshot, so this is a head dataset. 1215fa9e4066Sahrens * Destroy the deadlist. Unless it's a clone, the 1216fa9e4066Sahrens * deadlist should be empty. (If it's a clone, it's 1217fa9e4066Sahrens * safe to ignore the deadlist contents.) 1218fa9e4066Sahrens */ 1219fa9e4066Sahrens struct killarg ka; 1220fa9e4066Sahrens 1221fa9e4066Sahrens ASSERT(after_branch_point || bplist_empty(&ds->ds_deadlist)); 1222fa9e4066Sahrens bplist_close(&ds->ds_deadlist); 1223fa9e4066Sahrens bplist_destroy(mos, ds->ds_phys->ds_deadlist_obj, tx); 1224fa9e4066Sahrens ds->ds_phys->ds_deadlist_obj = 0; 1225fa9e4066Sahrens 1226fa9e4066Sahrens /* 1227fa9e4066Sahrens * Free everything that we point to (that's born after 1228fa9e4066Sahrens * the previous snapshot, if we are a clone) 1229fa9e4066Sahrens * 1230fa9e4066Sahrens * XXX we're doing this long task with the config lock held 1231fa9e4066Sahrens */ 1232fa9e4066Sahrens ka.usedp = &used; 1233fa9e4066Sahrens ka.compressedp = &compressed; 1234fa9e4066Sahrens ka.uncompressedp = &uncompressed; 1235fa9e4066Sahrens ka.zio = zio; 1236fa9e4066Sahrens ka.tx = tx; 1237fa9e4066Sahrens err = traverse_dsl_dataset(ds, ds->ds_phys->ds_prev_snap_txg, 1238fa9e4066Sahrens ADVANCE_POST, kill_blkptr, &ka); 1239fa9e4066Sahrens ASSERT3U(err, ==, 0); 1240fa9e4066Sahrens } 1241fa9e4066Sahrens 1242fa9e4066Sahrens err = zio_wait(zio); 1243fa9e4066Sahrens ASSERT3U(err, ==, 0); 1244fa9e4066Sahrens 12451d452cf5Sahrens dsl_dir_diduse_space(ds->ds_dir, -used, -compressed, -uncompressed, tx); 1246fa9e4066Sahrens 1247fa9e4066Sahrens if (ds->ds_phys->ds_snapnames_zapobj) { 1248fa9e4066Sahrens err = zap_destroy(mos, ds->ds_phys->ds_snapnames_zapobj, tx); 1249fa9e4066Sahrens ASSERT(err == 0); 1250fa9e4066Sahrens } 1251fa9e4066Sahrens 12521d452cf5Sahrens if (ds->ds_dir->dd_phys->dd_head_dataset_obj == ds->ds_object) { 1253fa9e4066Sahrens /* Erase the link in the dataset */ 12541d452cf5Sahrens dmu_buf_will_dirty(ds->ds_dir->dd_dbuf, tx); 12551d452cf5Sahrens ds->ds_dir->dd_phys->dd_head_dataset_obj = 0; 1256fa9e4066Sahrens /* 1257fa9e4066Sahrens * dsl_dir_sync_destroy() called us, they'll destroy 1258fa9e4066Sahrens * the dataset. 1259fa9e4066Sahrens */ 1260fa9e4066Sahrens } else { 1261fa9e4066Sahrens /* remove from snapshot namespace */ 1262fa9e4066Sahrens dsl_dataset_t *ds_head; 12631d452cf5Sahrens VERIFY(0 == dsl_dataset_open_obj(dp, 12641d452cf5Sahrens ds->ds_dir->dd_phys->dd_head_dataset_obj, NULL, 1265ea8dc4b6Seschrock DS_MODE_NONE, FTAG, &ds_head)); 12668660574dSahrens VERIFY(0 == dsl_dataset_get_snapname(ds)); 1267fa9e4066Sahrens #ifdef ZFS_DEBUG 1268fa9e4066Sahrens { 1269fa9e4066Sahrens uint64_t val; 1270fa9e4066Sahrens err = zap_lookup(mos, 1271fa9e4066Sahrens ds_head->ds_phys->ds_snapnames_zapobj, 12721d452cf5Sahrens ds->ds_snapname, 8, 1, &val); 1273fa9e4066Sahrens ASSERT3U(err, ==, 0); 1274fa9e4066Sahrens ASSERT3U(val, ==, obj); 1275fa9e4066Sahrens } 1276fa9e4066Sahrens #endif 1277fa9e4066Sahrens err = zap_remove(mos, ds_head->ds_phys->ds_snapnames_zapobj, 12781d452cf5Sahrens ds->ds_snapname, tx); 1279fa9e4066Sahrens ASSERT(err == 0); 1280fa9e4066Sahrens dsl_dataset_close(ds_head, DS_MODE_NONE, FTAG); 1281fa9e4066Sahrens } 1282fa9e4066Sahrens 1283fa9e4066Sahrens if (ds_prev && ds->ds_prev != ds_prev) 1284fa9e4066Sahrens dsl_dataset_close(ds_prev, DS_MODE_NONE, FTAG); 1285fa9e4066Sahrens 12861d452cf5Sahrens dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, tag); 12871d452cf5Sahrens VERIFY(0 == dmu_object_free(mos, obj, tx)); 1288fa9e4066Sahrens } 1289fa9e4066Sahrens 12901d452cf5Sahrens /* ARGSUSED */ 1291fa9e4066Sahrens int 12921d452cf5Sahrens dsl_dataset_snapshot_check(void *arg1, void *arg2, dmu_tx_t *tx) 1293fa9e4066Sahrens { 12941d452cf5Sahrens objset_t *os = arg1; 12951d452cf5Sahrens dsl_dataset_t *ds = os->os->os_dsl_dataset; 12961d452cf5Sahrens const char *snapname = arg2; 12971d452cf5Sahrens objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 1298fa9e4066Sahrens int err; 12991d452cf5Sahrens uint64_t value; 1300fa9e4066Sahrens 13011d452cf5Sahrens /* 13021d452cf5Sahrens * We don't allow multiple snapshots of the same txg. If there 13031d452cf5Sahrens * is already one, try again. 13041d452cf5Sahrens */ 13051d452cf5Sahrens if (ds->ds_phys->ds_prev_snap_txg >= tx->tx_txg) 13061d452cf5Sahrens return (EAGAIN); 1307fa9e4066Sahrens 13081d452cf5Sahrens /* 13091d452cf5Sahrens * Check for conflicting name snapshot name. 13101d452cf5Sahrens */ 1311fa9e4066Sahrens err = zap_lookup(mos, ds->ds_phys->ds_snapnames_zapobj, 1312fa9e4066Sahrens snapname, 8, 1, &value); 13131d452cf5Sahrens if (err == 0) 1314fa9e4066Sahrens return (EEXIST); 13151d452cf5Sahrens if (err != ENOENT) 13161d452cf5Sahrens return (err); 1317fa9e4066Sahrens 13181d452cf5Sahrens ds->ds_trysnap_txg = tx->tx_txg; 13191d452cf5Sahrens return (0); 13201d452cf5Sahrens } 1321fa9e4066Sahrens 13221d452cf5Sahrens void 13231d452cf5Sahrens dsl_dataset_snapshot_sync(void *arg1, void *arg2, dmu_tx_t *tx) 13241d452cf5Sahrens { 13251d452cf5Sahrens objset_t *os = arg1; 13261d452cf5Sahrens dsl_dataset_t *ds = os->os->os_dsl_dataset; 13271d452cf5Sahrens const char *snapname = arg2; 13281d452cf5Sahrens dsl_pool_t *dp = ds->ds_dir->dd_pool; 13291d452cf5Sahrens dmu_buf_t *dbuf; 13301d452cf5Sahrens dsl_dataset_phys_t *dsphys; 13311d452cf5Sahrens uint64_t dsobj; 13321d452cf5Sahrens objset_t *mos = dp->dp_meta_objset; 13331d452cf5Sahrens int err; 1334fa9e4066Sahrens 1335fa9e4066Sahrens spa_scrub_restart(dp->dp_spa, tx->tx_txg); 13361d452cf5Sahrens ASSERT(RW_WRITE_HELD(&dp->dp_config_rwlock)); 1337fa9e4066Sahrens 13381649cd4bStabriz dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 13391649cd4bStabriz DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 1340ea8dc4b6Seschrock VERIFY(0 == dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 1341fa9e4066Sahrens dmu_buf_will_dirty(dbuf, tx); 1342fa9e4066Sahrens dsphys = dbuf->db_data; 13431d452cf5Sahrens dsphys->ds_dir_obj = ds->ds_dir->dd_object; 1344fa9e4066Sahrens dsphys->ds_fsid_guid = unique_create(); 1345fa9e4066Sahrens unique_remove(dsphys->ds_fsid_guid); /* it isn't open yet */ 1346fa9e4066Sahrens (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 1347fa9e4066Sahrens sizeof (dsphys->ds_guid)); 1348fa9e4066Sahrens dsphys->ds_prev_snap_obj = ds->ds_phys->ds_prev_snap_obj; 1349fa9e4066Sahrens dsphys->ds_prev_snap_txg = ds->ds_phys->ds_prev_snap_txg; 1350fa9e4066Sahrens dsphys->ds_next_snap_obj = ds->ds_object; 1351fa9e4066Sahrens dsphys->ds_num_children = 1; 1352fa9e4066Sahrens dsphys->ds_creation_time = gethrestime_sec(); 1353fa9e4066Sahrens dsphys->ds_creation_txg = tx->tx_txg; 1354fa9e4066Sahrens dsphys->ds_deadlist_obj = ds->ds_phys->ds_deadlist_obj; 1355fa9e4066Sahrens dsphys->ds_used_bytes = ds->ds_phys->ds_used_bytes; 1356fa9e4066Sahrens dsphys->ds_compressed_bytes = ds->ds_phys->ds_compressed_bytes; 1357fa9e4066Sahrens dsphys->ds_uncompressed_bytes = ds->ds_phys->ds_uncompressed_bytes; 135899653d4eSeschrock dsphys->ds_flags = ds->ds_phys->ds_flags; 1359fa9e4066Sahrens dsphys->ds_bp = ds->ds_phys->ds_bp; 1360ea8dc4b6Seschrock dmu_buf_rele(dbuf, FTAG); 1361fa9e4066Sahrens 13621d452cf5Sahrens ASSERT3U(ds->ds_prev != 0, ==, ds->ds_phys->ds_prev_snap_obj != 0); 13631d452cf5Sahrens if (ds->ds_prev) { 13641d452cf5Sahrens ASSERT(ds->ds_prev->ds_phys->ds_next_snap_obj == 1365fa9e4066Sahrens ds->ds_object || 13661d452cf5Sahrens ds->ds_prev->ds_phys->ds_num_children > 1); 13671d452cf5Sahrens if (ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object) { 13681d452cf5Sahrens dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 1369fa9e4066Sahrens ASSERT3U(ds->ds_phys->ds_prev_snap_txg, ==, 13701d452cf5Sahrens ds->ds_prev->ds_phys->ds_creation_txg); 13711d452cf5Sahrens ds->ds_prev->ds_phys->ds_next_snap_obj = dsobj; 1372fa9e4066Sahrens } 1373fa9e4066Sahrens } 1374fa9e4066Sahrens 1375fa9e4066Sahrens bplist_close(&ds->ds_deadlist); 1376fa9e4066Sahrens dmu_buf_will_dirty(ds->ds_dbuf, tx); 1377fa9e4066Sahrens ASSERT3U(ds->ds_phys->ds_prev_snap_txg, <, dsphys->ds_creation_txg); 1378fa9e4066Sahrens ds->ds_phys->ds_prev_snap_obj = dsobj; 1379fa9e4066Sahrens ds->ds_phys->ds_prev_snap_txg = dsphys->ds_creation_txg; 1380fa9e4066Sahrens ds->ds_phys->ds_unique_bytes = 0; 1381fa9e4066Sahrens ds->ds_phys->ds_deadlist_obj = 1382fa9e4066Sahrens bplist_create(mos, DSL_DEADLIST_BLOCKSIZE, tx); 1383ea8dc4b6Seschrock VERIFY(0 == bplist_open(&ds->ds_deadlist, mos, 1384ea8dc4b6Seschrock ds->ds_phys->ds_deadlist_obj)); 1385fa9e4066Sahrens 1386fa9e4066Sahrens dprintf("snap '%s' -> obj %llu\n", snapname, dsobj); 1387fa9e4066Sahrens err = zap_add(mos, ds->ds_phys->ds_snapnames_zapobj, 1388fa9e4066Sahrens snapname, 8, 1, &dsobj, tx); 1389fa9e4066Sahrens ASSERT(err == 0); 1390fa9e4066Sahrens 1391fa9e4066Sahrens if (ds->ds_prev) 1392fa9e4066Sahrens dsl_dataset_close(ds->ds_prev, DS_MODE_NONE, ds); 1393ea8dc4b6Seschrock VERIFY(0 == dsl_dataset_open_obj(dp, 1394ea8dc4b6Seschrock ds->ds_phys->ds_prev_snap_obj, snapname, 1395ea8dc4b6Seschrock DS_MODE_NONE, ds, &ds->ds_prev)); 1396fa9e4066Sahrens } 1397fa9e4066Sahrens 1398fa9e4066Sahrens void 1399fa9e4066Sahrens dsl_dataset_sync(dsl_dataset_t *ds, dmu_tx_t *tx) 1400fa9e4066Sahrens { 1401fa9e4066Sahrens ASSERT(dmu_tx_is_syncing(tx)); 1402fa9e4066Sahrens ASSERT(ds->ds_user_ptr != NULL); 1403fa9e4066Sahrens ASSERT(ds->ds_phys->ds_next_snap_obj == 0); 1404fa9e4066Sahrens 1405fa9e4066Sahrens dmu_objset_sync(ds->ds_user_ptr, tx); 1406fa9e4066Sahrens dsl_dir_dirty(ds->ds_dir, tx); 1407fa9e4066Sahrens bplist_close(&ds->ds_deadlist); 1408fa9e4066Sahrens 1409ea8dc4b6Seschrock dmu_buf_rele(ds->ds_dbuf, ds); 1410fa9e4066Sahrens } 1411fa9e4066Sahrens 1412fa9e4066Sahrens void 1413fa9e4066Sahrens dsl_dataset_stats(dsl_dataset_t *ds, dmu_objset_stats_t *dds) 1414fa9e4066Sahrens { 1415fa9e4066Sahrens /* fill in properties crap */ 1416fa9e4066Sahrens dsl_dir_stats(ds->ds_dir, dds); 1417fa9e4066Sahrens 1418fa9e4066Sahrens if (ds->ds_phys->ds_num_children != 0) { 1419fa9e4066Sahrens dds->dds_is_snapshot = TRUE; 1420fa9e4066Sahrens dds->dds_num_clones = ds->ds_phys->ds_num_children - 1; 1421fa9e4066Sahrens } 1422fa9e4066Sahrens 142399653d4eSeschrock dds->dds_inconsistent = ds->ds_phys->ds_flags & DS_FLAG_INCONSISTENT; 1424fa9e4066Sahrens dds->dds_last_txg = ds->ds_phys->ds_bp.blk_birth; 1425fa9e4066Sahrens 1426fa9e4066Sahrens dds->dds_objects_used = ds->ds_phys->ds_bp.blk_fill; 1427fa9e4066Sahrens dds->dds_objects_avail = DN_MAX_OBJECT - dds->dds_objects_used; 1428fa9e4066Sahrens 1429fa9e4066Sahrens /* We override the dataset's creation time... they should be the same */ 1430fa9e4066Sahrens dds->dds_creation_time = ds->ds_phys->ds_creation_time; 1431fa9e4066Sahrens dds->dds_creation_txg = ds->ds_phys->ds_creation_txg; 1432fa9e4066Sahrens dds->dds_space_refd = ds->ds_phys->ds_used_bytes; 1433fa9e4066Sahrens dds->dds_fsid_guid = ds->ds_phys->ds_fsid_guid; 1434fa9e4066Sahrens 1435fa9e4066Sahrens if (ds->ds_phys->ds_next_snap_obj) { 1436fa9e4066Sahrens /* 1437fa9e4066Sahrens * This is a snapshot; override the dd's space used with 1438fa9e4066Sahrens * our unique space 1439fa9e4066Sahrens */ 1440fa9e4066Sahrens dds->dds_space_used = ds->ds_phys->ds_unique_bytes; 1441fa9e4066Sahrens dds->dds_compressed_bytes = 1442fa9e4066Sahrens ds->ds_phys->ds_compressed_bytes; 1443fa9e4066Sahrens dds->dds_uncompressed_bytes = 1444fa9e4066Sahrens ds->ds_phys->ds_uncompressed_bytes; 1445fa9e4066Sahrens } 1446fa9e4066Sahrens } 1447fa9e4066Sahrens 1448fa9e4066Sahrens dsl_pool_t * 1449fa9e4066Sahrens dsl_dataset_pool(dsl_dataset_t *ds) 1450fa9e4066Sahrens { 1451fa9e4066Sahrens return (ds->ds_dir->dd_pool); 1452fa9e4066Sahrens } 1453fa9e4066Sahrens 14541d452cf5Sahrens /* ARGSUSED */ 1455fa9e4066Sahrens static int 14561d452cf5Sahrens dsl_dataset_snapshot_rename_check(void *arg1, void *arg2, dmu_tx_t *tx) 1457fa9e4066Sahrens { 14581d452cf5Sahrens dsl_dataset_t *ds = arg1; 14591d452cf5Sahrens char *newsnapname = arg2; 14601d452cf5Sahrens dsl_dir_t *dd = ds->ds_dir; 1461fa9e4066Sahrens objset_t *mos = dd->dd_pool->dp_meta_objset; 14621d452cf5Sahrens dsl_dataset_t *hds; 1463fa9e4066Sahrens uint64_t val; 14641d452cf5Sahrens int err; 1465fa9e4066Sahrens 14661d452cf5Sahrens err = dsl_dataset_open_obj(dd->dd_pool, 14671d452cf5Sahrens dd->dd_phys->dd_head_dataset_obj, NULL, DS_MODE_NONE, FTAG, &hds); 1468fa9e4066Sahrens if (err) 1469fa9e4066Sahrens return (err); 1470fa9e4066Sahrens 14711d452cf5Sahrens /* new name better not be in use */ 14721d452cf5Sahrens err = zap_lookup(mos, hds->ds_phys->ds_snapnames_zapobj, 14731d452cf5Sahrens newsnapname, 8, 1, &val); 14741d452cf5Sahrens dsl_dataset_close(hds, DS_MODE_NONE, FTAG); 14751d452cf5Sahrens 14761d452cf5Sahrens if (err == 0) 14771d452cf5Sahrens err = EEXIST; 14781d452cf5Sahrens else if (err == ENOENT) 14791d452cf5Sahrens err = 0; 14801d452cf5Sahrens return (err); 14811d452cf5Sahrens } 1482fa9e4066Sahrens 14831d452cf5Sahrens static void 14841d452cf5Sahrens dsl_dataset_snapshot_rename_sync(void *arg1, void *arg2, dmu_tx_t *tx) 14851d452cf5Sahrens { 14861d452cf5Sahrens dsl_dataset_t *ds = arg1; 14871d452cf5Sahrens char *newsnapname = arg2; 14881d452cf5Sahrens dsl_dir_t *dd = ds->ds_dir; 14891d452cf5Sahrens objset_t *mos = dd->dd_pool->dp_meta_objset; 14901d452cf5Sahrens dsl_dataset_t *hds; 14911d452cf5Sahrens int err; 1492fa9e4066Sahrens 14931d452cf5Sahrens ASSERT(ds->ds_phys->ds_next_snap_obj != 0); 1494fa9e4066Sahrens 14951d452cf5Sahrens VERIFY(0 == dsl_dataset_open_obj(dd->dd_pool, 14961d452cf5Sahrens dd->dd_phys->dd_head_dataset_obj, NULL, DS_MODE_NONE, FTAG, &hds)); 1497fa9e4066Sahrens 14981d452cf5Sahrens VERIFY(0 == dsl_dataset_get_snapname(ds)); 14991d452cf5Sahrens err = zap_remove(mos, hds->ds_phys->ds_snapnames_zapobj, 15001d452cf5Sahrens ds->ds_snapname, tx); 1501fa9e4066Sahrens ASSERT3U(err, ==, 0); 15021d452cf5Sahrens mutex_enter(&ds->ds_lock); 15031d452cf5Sahrens (void) strcpy(ds->ds_snapname, newsnapname); 15041d452cf5Sahrens mutex_exit(&ds->ds_lock); 15051d452cf5Sahrens err = zap_add(mos, hds->ds_phys->ds_snapnames_zapobj, 15061d452cf5Sahrens ds->ds_snapname, 8, 1, &ds->ds_object, tx); 1507fa9e4066Sahrens ASSERT3U(err, ==, 0); 1508fa9e4066Sahrens 15091d452cf5Sahrens dsl_dataset_close(hds, DS_MODE_NONE, FTAG); 1510fa9e4066Sahrens } 1511fa9e4066Sahrens 1512fa9e4066Sahrens #pragma weak dmu_objset_rename = dsl_dataset_rename 1513fa9e4066Sahrens int 15141d452cf5Sahrens dsl_dataset_rename(const char *oldname, const char *newname) 1515fa9e4066Sahrens { 1516fa9e4066Sahrens dsl_dir_t *dd; 15171d452cf5Sahrens dsl_dataset_t *ds; 1518fa9e4066Sahrens const char *tail; 1519fa9e4066Sahrens int err; 1520fa9e4066Sahrens 15211d452cf5Sahrens err = dsl_dir_open(oldname, FTAG, &dd, &tail); 1522ea8dc4b6Seschrock if (err) 1523ea8dc4b6Seschrock return (err); 1524fa9e4066Sahrens if (tail == NULL) { 15251d452cf5Sahrens err = dsl_dir_rename(dd, newname); 1526fa9e4066Sahrens dsl_dir_close(dd, FTAG); 1527fa9e4066Sahrens return (err); 1528fa9e4066Sahrens } 1529fa9e4066Sahrens if (tail[0] != '@') { 1530fa9e4066Sahrens /* the name ended in a nonexistant component */ 1531fa9e4066Sahrens dsl_dir_close(dd, FTAG); 1532fa9e4066Sahrens return (ENOENT); 1533fa9e4066Sahrens } 1534fa9e4066Sahrens 1535fa9e4066Sahrens dsl_dir_close(dd, FTAG); 15361d452cf5Sahrens 15371d452cf5Sahrens /* new name must be snapshot in same filesystem */ 15381d452cf5Sahrens tail = strchr(newname, '@'); 15391d452cf5Sahrens if (tail == NULL) 15401d452cf5Sahrens return (EINVAL); 15411d452cf5Sahrens tail++; 15421d452cf5Sahrens if (strncmp(oldname, newname, tail - newname) != 0) 15431d452cf5Sahrens return (EXDEV); 15441d452cf5Sahrens 15451d452cf5Sahrens err = dsl_dataset_open(oldname, 15461d452cf5Sahrens DS_MODE_READONLY | DS_MODE_STANDARD, FTAG, &ds); 15471d452cf5Sahrens if (err) 15481d452cf5Sahrens return (err); 15491d452cf5Sahrens 15501d452cf5Sahrens err = dsl_sync_task_do(ds->ds_dir->dd_pool, 15511d452cf5Sahrens dsl_dataset_snapshot_rename_check, 15521d452cf5Sahrens dsl_dataset_snapshot_rename_sync, ds, (char *)tail, 1); 15531d452cf5Sahrens 15541d452cf5Sahrens dsl_dataset_close(ds, DS_MODE_STANDARD, FTAG); 15551d452cf5Sahrens 1556fa9e4066Sahrens return (err); 1557fa9e4066Sahrens } 155899653d4eSeschrock 15591d452cf5Sahrens struct promotearg { 15601d452cf5Sahrens uint64_t used, comp, uncomp, unique; 15611d452cf5Sahrens uint64_t newnext_obj, snapnames_obj; 15621d452cf5Sahrens }; 15631d452cf5Sahrens 156499653d4eSeschrock static int 15651d452cf5Sahrens dsl_dataset_promote_check(void *arg1, void *arg2, dmu_tx_t *tx) 156699653d4eSeschrock { 15671d452cf5Sahrens dsl_dataset_t *hds = arg1; 15681d452cf5Sahrens struct promotearg *pa = arg2; 15691d452cf5Sahrens dsl_dir_t *dd = hds->ds_dir; 15701d452cf5Sahrens dsl_pool_t *dp = hds->ds_dir->dd_pool; 157199653d4eSeschrock dsl_dir_t *pdd = NULL; 157299653d4eSeschrock dsl_dataset_t *ds = NULL; 157399653d4eSeschrock dsl_dataset_t *pivot_ds = NULL; 157499653d4eSeschrock dsl_dataset_t *newnext_ds = NULL; 157599653d4eSeschrock int err; 157699653d4eSeschrock char *name = NULL; 15771d452cf5Sahrens uint64_t itor = 0; 157899653d4eSeschrock blkptr_t bp; 157999653d4eSeschrock 15801d452cf5Sahrens bzero(pa, sizeof (*pa)); 15811d452cf5Sahrens 158299653d4eSeschrock /* Check that it is a clone */ 158399653d4eSeschrock if (dd->dd_phys->dd_clone_parent_obj == 0) 158499653d4eSeschrock return (EINVAL); 158599653d4eSeschrock 15861d452cf5Sahrens /* Since this is so expensive, don't do the preliminary check */ 15871d452cf5Sahrens if (!dmu_tx_is_syncing(tx)) 15881d452cf5Sahrens return (0); 15891d452cf5Sahrens 15901d452cf5Sahrens if (err = dsl_dataset_open_obj(dp, 159199653d4eSeschrock dd->dd_phys->dd_clone_parent_obj, 159299653d4eSeschrock NULL, DS_MODE_EXCLUSIVE, FTAG, &pivot_ds)) 159399653d4eSeschrock goto out; 159499653d4eSeschrock pdd = pivot_ds->ds_dir; 15951d452cf5Sahrens 15961d452cf5Sahrens { 15971d452cf5Sahrens dsl_dataset_t *phds; 15981d452cf5Sahrens if (err = dsl_dataset_open_obj(dd->dd_pool, 15991d452cf5Sahrens pdd->dd_phys->dd_head_dataset_obj, 16001d452cf5Sahrens NULL, DS_MODE_NONE, FTAG, &phds)) 16011d452cf5Sahrens goto out; 16021d452cf5Sahrens pa->snapnames_obj = phds->ds_phys->ds_snapnames_zapobj; 16031d452cf5Sahrens dsl_dataset_close(phds, DS_MODE_NONE, FTAG); 16041d452cf5Sahrens } 160599653d4eSeschrock 160699653d4eSeschrock if (hds->ds_phys->ds_flags & DS_FLAG_NOPROMOTE) { 160799653d4eSeschrock err = EXDEV; 160899653d4eSeschrock goto out; 160999653d4eSeschrock } 161099653d4eSeschrock 161199653d4eSeschrock /* find pivot point's new next ds */ 161299653d4eSeschrock VERIFY(0 == dsl_dataset_open_obj(dd->dd_pool, hds->ds_object, 161399653d4eSeschrock NULL, DS_MODE_NONE, FTAG, &newnext_ds)); 161499653d4eSeschrock while (newnext_ds->ds_phys->ds_prev_snap_obj != pivot_ds->ds_object) { 161599653d4eSeschrock dsl_dataset_t *prev; 161699653d4eSeschrock 161799653d4eSeschrock if (err = dsl_dataset_open_obj(dd->dd_pool, 16181d452cf5Sahrens newnext_ds->ds_phys->ds_prev_snap_obj, 16191d452cf5Sahrens NULL, DS_MODE_NONE, FTAG, &prev)) 162099653d4eSeschrock goto out; 162199653d4eSeschrock dsl_dataset_close(newnext_ds, DS_MODE_NONE, FTAG); 162299653d4eSeschrock newnext_ds = prev; 162399653d4eSeschrock } 16241d452cf5Sahrens pa->newnext_obj = newnext_ds->ds_object; 162599653d4eSeschrock 162699653d4eSeschrock /* compute pivot point's new unique space */ 162799653d4eSeschrock while ((err = bplist_iterate(&newnext_ds->ds_deadlist, 162899653d4eSeschrock &itor, &bp)) == 0) { 162999653d4eSeschrock if (bp.blk_birth > pivot_ds->ds_phys->ds_prev_snap_txg) 16301d452cf5Sahrens pa->unique += bp_get_dasize(dd->dd_pool->dp_spa, &bp); 163199653d4eSeschrock } 163299653d4eSeschrock if (err != ENOENT) 163399653d4eSeschrock goto out; 163499653d4eSeschrock 163599653d4eSeschrock /* Walk the snapshots that we are moving */ 163699653d4eSeschrock name = kmem_alloc(MAXPATHLEN, KM_SLEEP); 163799653d4eSeschrock ds = pivot_ds; 163899653d4eSeschrock /* CONSTCOND */ 163999653d4eSeschrock while (TRUE) { 164099653d4eSeschrock uint64_t val, dlused, dlcomp, dluncomp; 164199653d4eSeschrock dsl_dataset_t *prev; 164299653d4eSeschrock 164399653d4eSeschrock /* Check that the snapshot name does not conflict */ 164499653d4eSeschrock dsl_dataset_name(ds, name); 164599653d4eSeschrock err = zap_lookup(dd->dd_pool->dp_meta_objset, 164699653d4eSeschrock hds->ds_phys->ds_snapnames_zapobj, ds->ds_snapname, 164799653d4eSeschrock 8, 1, &val); 164899653d4eSeschrock if (err != ENOENT) { 164999653d4eSeschrock if (err == 0) 165099653d4eSeschrock err = EEXIST; 165199653d4eSeschrock goto out; 165299653d4eSeschrock } 165399653d4eSeschrock 165499653d4eSeschrock /* 165599653d4eSeschrock * compute space to transfer. Each snapshot gave birth to: 165699653d4eSeschrock * (my used) - (prev's used) + (deadlist's used) 165799653d4eSeschrock */ 16581d452cf5Sahrens pa->used += ds->ds_phys->ds_used_bytes; 16591d452cf5Sahrens pa->comp += ds->ds_phys->ds_compressed_bytes; 16601d452cf5Sahrens pa->uncomp += ds->ds_phys->ds_uncompressed_bytes; 166199653d4eSeschrock 166299653d4eSeschrock /* If we reach the first snapshot, we're done. */ 166399653d4eSeschrock if (ds->ds_phys->ds_prev_snap_obj == 0) 166499653d4eSeschrock break; 166599653d4eSeschrock 166699653d4eSeschrock if (err = bplist_space(&ds->ds_deadlist, 166799653d4eSeschrock &dlused, &dlcomp, &dluncomp)) 166899653d4eSeschrock goto out; 166999653d4eSeschrock if (err = dsl_dataset_open_obj(dd->dd_pool, 167099653d4eSeschrock ds->ds_phys->ds_prev_snap_obj, NULL, DS_MODE_EXCLUSIVE, 167199653d4eSeschrock FTAG, &prev)) 167299653d4eSeschrock goto out; 16731d452cf5Sahrens pa->used += dlused - prev->ds_phys->ds_used_bytes; 16741d452cf5Sahrens pa->comp += dlcomp - prev->ds_phys->ds_compressed_bytes; 16751d452cf5Sahrens pa->uncomp += dluncomp - prev->ds_phys->ds_uncompressed_bytes; 167699653d4eSeschrock 167799653d4eSeschrock /* 167899653d4eSeschrock * We could be a clone of a clone. If we reach our 167999653d4eSeschrock * parent's branch point, we're done. 168099653d4eSeschrock */ 168199653d4eSeschrock if (prev->ds_phys->ds_next_snap_obj != ds->ds_object) { 168299653d4eSeschrock dsl_dataset_close(prev, DS_MODE_EXCLUSIVE, FTAG); 168399653d4eSeschrock break; 168499653d4eSeschrock } 168599653d4eSeschrock if (ds != pivot_ds) 168699653d4eSeschrock dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG); 168799653d4eSeschrock ds = prev; 168899653d4eSeschrock } 168999653d4eSeschrock 169099653d4eSeschrock /* Check that there is enough space here */ 16911d452cf5Sahrens err = dsl_dir_transfer_possible(pdd, dd, pa->used); 16921d452cf5Sahrens 16931d452cf5Sahrens out: 16941d452cf5Sahrens if (ds && ds != pivot_ds) 16951d452cf5Sahrens dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG); 16961d452cf5Sahrens if (pivot_ds) 16971d452cf5Sahrens dsl_dataset_close(pivot_ds, DS_MODE_EXCLUSIVE, FTAG); 16981d452cf5Sahrens if (newnext_ds) 16991d452cf5Sahrens dsl_dataset_close(newnext_ds, DS_MODE_NONE, FTAG); 17001d452cf5Sahrens if (name) 17011d452cf5Sahrens kmem_free(name, MAXPATHLEN); 17021d452cf5Sahrens return (err); 17031d452cf5Sahrens } 170499653d4eSeschrock 17051d452cf5Sahrens static void 17061d452cf5Sahrens dsl_dataset_promote_sync(void *arg1, void *arg2, dmu_tx_t *tx) 17071d452cf5Sahrens { 17081d452cf5Sahrens dsl_dataset_t *hds = arg1; 17091d452cf5Sahrens struct promotearg *pa = arg2; 17101d452cf5Sahrens dsl_dir_t *dd = hds->ds_dir; 17111d452cf5Sahrens dsl_pool_t *dp = hds->ds_dir->dd_pool; 17121d452cf5Sahrens dsl_dir_t *pdd = NULL; 17131d452cf5Sahrens dsl_dataset_t *ds, *pivot_ds; 17141d452cf5Sahrens char *name; 17151d452cf5Sahrens 17161d452cf5Sahrens ASSERT(dd->dd_phys->dd_clone_parent_obj != 0); 17171d452cf5Sahrens ASSERT(0 == (hds->ds_phys->ds_flags & DS_FLAG_NOPROMOTE)); 17181d452cf5Sahrens 17191d452cf5Sahrens VERIFY(0 == dsl_dataset_open_obj(dp, 17201d452cf5Sahrens dd->dd_phys->dd_clone_parent_obj, 17211d452cf5Sahrens NULL, DS_MODE_EXCLUSIVE, FTAG, &pivot_ds)); 17220b69c2f0Sahrens /* 17230b69c2f0Sahrens * We need to explicitly open pdd, since pivot_ds's pdd will be 17240b69c2f0Sahrens * changing. 17250b69c2f0Sahrens */ 17260b69c2f0Sahrens VERIFY(0 == dsl_dir_open_obj(dp, pivot_ds->ds_dir->dd_object, 17270b69c2f0Sahrens NULL, FTAG, &pdd)); 172899653d4eSeschrock 172999653d4eSeschrock /* move snapshots to this dir */ 17301d452cf5Sahrens name = kmem_alloc(MAXPATHLEN, KM_SLEEP); 173199653d4eSeschrock ds = pivot_ds; 173299653d4eSeschrock /* CONSTCOND */ 173399653d4eSeschrock while (TRUE) { 173499653d4eSeschrock dsl_dataset_t *prev; 173599653d4eSeschrock 173699653d4eSeschrock /* move snap name entry */ 173799653d4eSeschrock dsl_dataset_name(ds, name); 17381d452cf5Sahrens VERIFY(0 == zap_remove(dp->dp_meta_objset, 17391d452cf5Sahrens pa->snapnames_obj, ds->ds_snapname, tx)); 17401d452cf5Sahrens VERIFY(0 == zap_add(dp->dp_meta_objset, 174199653d4eSeschrock hds->ds_phys->ds_snapnames_zapobj, ds->ds_snapname, 174299653d4eSeschrock 8, 1, &ds->ds_object, tx)); 174399653d4eSeschrock 174499653d4eSeschrock /* change containing dsl_dir */ 174599653d4eSeschrock dmu_buf_will_dirty(ds->ds_dbuf, tx); 174699653d4eSeschrock ASSERT3U(ds->ds_phys->ds_dir_obj, ==, pdd->dd_object); 174799653d4eSeschrock ds->ds_phys->ds_dir_obj = dd->dd_object; 174899653d4eSeschrock ASSERT3P(ds->ds_dir, ==, pdd); 174999653d4eSeschrock dsl_dir_close(ds->ds_dir, ds); 17501d452cf5Sahrens VERIFY(0 == dsl_dir_open_obj(dp, dd->dd_object, 175199653d4eSeschrock NULL, ds, &ds->ds_dir)); 175299653d4eSeschrock 175399653d4eSeschrock ASSERT3U(dsl_prop_numcb(ds), ==, 0); 175499653d4eSeschrock 175599653d4eSeschrock if (ds->ds_phys->ds_prev_snap_obj == 0) 175699653d4eSeschrock break; 175799653d4eSeschrock 17581d452cf5Sahrens VERIFY(0 == dsl_dataset_open_obj(dp, 175999653d4eSeschrock ds->ds_phys->ds_prev_snap_obj, NULL, DS_MODE_EXCLUSIVE, 176099653d4eSeschrock FTAG, &prev)); 176199653d4eSeschrock 176299653d4eSeschrock if (prev->ds_phys->ds_next_snap_obj != ds->ds_object) { 176399653d4eSeschrock dsl_dataset_close(prev, DS_MODE_EXCLUSIVE, FTAG); 176499653d4eSeschrock break; 176599653d4eSeschrock } 176699653d4eSeschrock if (ds != pivot_ds) 176799653d4eSeschrock dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG); 176899653d4eSeschrock ds = prev; 176999653d4eSeschrock } 17701d452cf5Sahrens if (ds != pivot_ds) 17711d452cf5Sahrens dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG); 177299653d4eSeschrock 177399653d4eSeschrock /* change pivot point's next snap */ 177499653d4eSeschrock dmu_buf_will_dirty(pivot_ds->ds_dbuf, tx); 17751d452cf5Sahrens pivot_ds->ds_phys->ds_next_snap_obj = pa->newnext_obj; 177699653d4eSeschrock 177799653d4eSeschrock /* change clone_parent-age */ 177899653d4eSeschrock dmu_buf_will_dirty(dd->dd_dbuf, tx); 177999653d4eSeschrock ASSERT3U(dd->dd_phys->dd_clone_parent_obj, ==, pivot_ds->ds_object); 178099653d4eSeschrock dd->dd_phys->dd_clone_parent_obj = pdd->dd_phys->dd_clone_parent_obj; 178199653d4eSeschrock dmu_buf_will_dirty(pdd->dd_dbuf, tx); 178299653d4eSeschrock pdd->dd_phys->dd_clone_parent_obj = pivot_ds->ds_object; 178399653d4eSeschrock 178499653d4eSeschrock /* change space accounting */ 17851d452cf5Sahrens dsl_dir_diduse_space(pdd, -pa->used, -pa->comp, -pa->uncomp, tx); 17861d452cf5Sahrens dsl_dir_diduse_space(dd, pa->used, pa->comp, pa->uncomp, tx); 17871d452cf5Sahrens pivot_ds->ds_phys->ds_unique_bytes = pa->unique; 178899653d4eSeschrock 17890b69c2f0Sahrens dsl_dir_close(pdd, FTAG); 17901d452cf5Sahrens dsl_dataset_close(pivot_ds, DS_MODE_EXCLUSIVE, FTAG); 17911d452cf5Sahrens kmem_free(name, MAXPATHLEN); 179299653d4eSeschrock } 179399653d4eSeschrock 179499653d4eSeschrock int 179599653d4eSeschrock dsl_dataset_promote(const char *name) 179699653d4eSeschrock { 179799653d4eSeschrock dsl_dataset_t *ds; 179899653d4eSeschrock int err; 179999653d4eSeschrock dmu_object_info_t doi; 18001d452cf5Sahrens struct promotearg pa; 180199653d4eSeschrock 180299653d4eSeschrock err = dsl_dataset_open(name, DS_MODE_NONE, FTAG, &ds); 180399653d4eSeschrock if (err) 180499653d4eSeschrock return (err); 180599653d4eSeschrock 180699653d4eSeschrock err = dmu_object_info(ds->ds_dir->dd_pool->dp_meta_objset, 180799653d4eSeschrock ds->ds_phys->ds_snapnames_zapobj, &doi); 180899653d4eSeschrock if (err) { 180999653d4eSeschrock dsl_dataset_close(ds, DS_MODE_NONE, FTAG); 181099653d4eSeschrock return (err); 181199653d4eSeschrock } 181299653d4eSeschrock 181399653d4eSeschrock /* 181499653d4eSeschrock * Add in 128x the snapnames zapobj size, since we will be moving 181599653d4eSeschrock * a bunch of snapnames to the promoted ds, and dirtying their 181699653d4eSeschrock * bonus buffers. 181799653d4eSeschrock */ 18181d452cf5Sahrens err = dsl_sync_task_do(ds->ds_dir->dd_pool, 18191d452cf5Sahrens dsl_dataset_promote_check, 18201d452cf5Sahrens dsl_dataset_promote_sync, ds, &pa, 2 + 2 * doi.doi_physical_blks); 182199653d4eSeschrock dsl_dataset_close(ds, DS_MODE_NONE, FTAG); 182299653d4eSeschrock return (err); 182399653d4eSeschrock } 1824