/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. */ /* Portions Copyright 2010 Robert Milkowski */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* * Needed to close a window in dnode_move() that allows the objset to be freed * before it can be safely accessed. */ krwlock_t os_lock; void dmu_objset_init(void) { rw_init(&os_lock, NULL, RW_DEFAULT, NULL); } void dmu_objset_fini(void) { rw_destroy(&os_lock); } spa_t * dmu_objset_spa(objset_t *os) { return (os->os_spa); } zilog_t * dmu_objset_zil(objset_t *os) { return (os->os_zil); } dsl_pool_t * dmu_objset_pool(objset_t *os) { dsl_dataset_t *ds; if ((ds = os->os_dsl_dataset) != NULL && ds->ds_dir) return (ds->ds_dir->dd_pool); else return (spa_get_dsl(os->os_spa)); } dsl_dataset_t * dmu_objset_ds(objset_t *os) { return (os->os_dsl_dataset); } dmu_objset_type_t dmu_objset_type(objset_t *os) { return (os->os_phys->os_type); } void dmu_objset_name(objset_t *os, char *buf) { dsl_dataset_name(os->os_dsl_dataset, buf); } uint64_t dmu_objset_id(objset_t *os) { dsl_dataset_t *ds = os->os_dsl_dataset; return (ds ? ds->ds_object : 0); } uint64_t dmu_objset_syncprop(objset_t *os) { return (os->os_sync); } uint64_t dmu_objset_logbias(objset_t *os) { return (os->os_logbias); } static void checksum_changed_cb(void *arg, uint64_t newval) { objset_t *os = arg; /* * Inheritance should have been done by now. */ ASSERT(newval != ZIO_CHECKSUM_INHERIT); os->os_checksum = zio_checksum_select(newval, ZIO_CHECKSUM_ON_VALUE); } static void compression_changed_cb(void *arg, uint64_t newval) { objset_t *os = arg; /* * Inheritance and range checking should have been done by now. */ ASSERT(newval != ZIO_COMPRESS_INHERIT); os->os_compress = zio_compress_select(newval, ZIO_COMPRESS_ON_VALUE); } static void copies_changed_cb(void *arg, uint64_t newval) { objset_t *os = arg; /* * Inheritance and range checking should have been done by now. */ ASSERT(newval > 0); ASSERT(newval <= spa_max_replication(os->os_spa)); os->os_copies = newval; } static void dedup_changed_cb(void *arg, uint64_t newval) { objset_t *os = arg; spa_t *spa = os->os_spa; enum zio_checksum checksum; /* * Inheritance should have been done by now. */ ASSERT(newval != ZIO_CHECKSUM_INHERIT); checksum = zio_checksum_dedup_select(spa, newval, ZIO_CHECKSUM_OFF); os->os_dedup_checksum = checksum & ZIO_CHECKSUM_MASK; os->os_dedup_verify = !!(checksum & ZIO_CHECKSUM_VERIFY); } static void primary_cache_changed_cb(void *arg, uint64_t newval) { objset_t *os = arg; /* * Inheritance and range checking should have been done by now. */ ASSERT(newval == ZFS_CACHE_ALL || newval == ZFS_CACHE_NONE || newval == ZFS_CACHE_METADATA); os->os_primary_cache = newval; } static void secondary_cache_changed_cb(void *arg, uint64_t newval) { objset_t *os = arg; /* * Inheritance and range checking should have been done by now. */ ASSERT(newval == ZFS_CACHE_ALL || newval == ZFS_CACHE_NONE || newval == ZFS_CACHE_METADATA); os->os_secondary_cache = newval; } static void sync_changed_cb(void *arg, uint64_t newval) { objset_t *os = arg; /* * Inheritance and range checking should have been done by now. */ ASSERT(newval == ZFS_SYNC_STANDARD || newval == ZFS_SYNC_ALWAYS || newval == ZFS_SYNC_DISABLED); os->os_sync = newval; if (os->os_zil) zil_set_sync(os->os_zil, newval); } static void logbias_changed_cb(void *arg, uint64_t newval) { objset_t *os = arg; ASSERT(newval == ZFS_LOGBIAS_LATENCY || newval == ZFS_LOGBIAS_THROUGHPUT); os->os_logbias = newval; if (os->os_zil) zil_set_logbias(os->os_zil, newval); } void dmu_objset_byteswap(void *buf, size_t size) { objset_phys_t *osp = buf; ASSERT(size == OBJSET_OLD_PHYS_SIZE || size == sizeof (objset_phys_t)); dnode_byteswap(&osp->os_meta_dnode); byteswap_uint64_array(&osp->os_zil_header, sizeof (zil_header_t)); osp->os_type = BSWAP_64(osp->os_type); osp->os_flags = BSWAP_64(osp->os_flags); if (size == sizeof (objset_phys_t)) { dnode_byteswap(&osp->os_userused_dnode); dnode_byteswap(&osp->os_groupused_dnode); } } int dmu_objset_open_impl(spa_t *spa, dsl_dataset_t *ds, blkptr_t *bp, objset_t **osp) { objset_t *os; int i, err; ASSERT(ds == NULL || MUTEX_HELD(&ds->ds_opening_lock)); os = kmem_zalloc(sizeof (objset_t), KM_SLEEP); os->os_dsl_dataset = ds; os->os_spa = spa; os->os_rootbp = bp; if (!BP_IS_HOLE(os->os_rootbp)) { uint32_t aflags = ARC_WAIT; zbookmark_t zb; SET_BOOKMARK(&zb, ds ? ds->ds_object : DMU_META_OBJSET, ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID); if (DMU_OS_IS_L2CACHEABLE(os)) aflags |= ARC_L2CACHE; dprintf_bp(os->os_rootbp, "reading %s", ""); /* * XXX when bprewrite scrub can change the bp, * and this is called from dmu_objset_open_ds_os, the bp * could change, and we'll need a lock. */ err = dsl_read_nolock(NULL, spa, os->os_rootbp, arc_getbuf_func, &os->os_phys_buf, ZIO_PRIORITY_SYNC_READ, ZIO_FLAG_CANFAIL, &aflags, &zb); if (err) { kmem_free(os, sizeof (objset_t)); /* convert checksum errors into IO errors */ if (err == ECKSUM) err = EIO; return (err); } /* Increase the blocksize if we are permitted. */ if (spa_version(spa) >= SPA_VERSION_USERSPACE && arc_buf_size(os->os_phys_buf) < sizeof (objset_phys_t)) { arc_buf_t *buf = arc_buf_alloc(spa, sizeof (objset_phys_t), &os->os_phys_buf, ARC_BUFC_METADATA); bzero(buf->b_data, sizeof (objset_phys_t)); bcopy(os->os_phys_buf->b_data, buf->b_data, arc_buf_size(os->os_phys_buf)); (void) arc_buf_remove_ref(os->os_phys_buf, &os->os_phys_buf); os->os_phys_buf = buf; } os->os_phys = os->os_phys_buf->b_data; os->os_flags = os->os_phys->os_flags; } else { int size = spa_version(spa) >= SPA_VERSION_USERSPACE ? sizeof (objset_phys_t) : OBJSET_OLD_PHYS_SIZE; os->os_phys_buf = arc_buf_alloc(spa, size, &os->os_phys_buf, ARC_BUFC_METADATA); os->os_phys = os->os_phys_buf->b_data; bzero(os->os_phys, size); } /* * Note: the changed_cb will be called once before the register * func returns, thus changing the checksum/compression from the * default (fletcher2/off). Snapshots don't need to know about * checksum/compression/copies. */ if (ds) { err = dsl_prop_register(ds, "primarycache", primary_cache_changed_cb, os); if (err == 0) err = dsl_prop_register(ds, "secondarycache", secondary_cache_changed_cb, os); if (!dsl_dataset_is_snapshot(ds)) { if (err == 0) err = dsl_prop_register(ds, "checksum", checksum_changed_cb, os); if (err == 0) err = dsl_prop_register(ds, "compression", compression_changed_cb, os); if (err == 0) err = dsl_prop_register(ds, "copies", copies_changed_cb, os); if (err == 0) err = dsl_prop_register(ds, "dedup", dedup_changed_cb, os); if (err == 0) err = dsl_prop_register(ds, "logbias", logbias_changed_cb, os); if (err == 0) err = dsl_prop_register(ds, "sync", sync_changed_cb, os); } if (err) { VERIFY(arc_buf_remove_ref(os->os_phys_buf, &os->os_phys_buf) == 1); kmem_free(os, sizeof (objset_t)); return (err); } } else if (ds == NULL) { /* It's the meta-objset. */ os->os_checksum = ZIO_CHECKSUM_FLETCHER_4; os->os_compress = ZIO_COMPRESS_LZJB; os->os_copies = spa_max_replication(spa); os->os_dedup_checksum = ZIO_CHECKSUM_OFF; os->os_dedup_verify = 0; os->os_logbias = 0; os->os_sync = 0; os->os_primary_cache = ZFS_CACHE_ALL; os->os_secondary_cache = ZFS_CACHE_ALL; } os->os_zil_header = os->os_phys->os_zil_header; os->os_zil = zil_alloc(os, &os->os_zil_header); for (i = 0; i < TXG_SIZE; i++) { list_create(&os->os_dirty_dnodes[i], sizeof (dnode_t), offsetof(dnode_t, dn_dirty_link[i])); list_create(&os->os_free_dnodes[i], sizeof (dnode_t), offsetof(dnode_t, dn_dirty_link[i])); } list_create(&os->os_dnodes, sizeof (dnode_t), offsetof(dnode_t, dn_link)); list_create(&os->os_downgraded_dbufs, sizeof (dmu_buf_impl_t), offsetof(dmu_buf_impl_t, db_link)); mutex_init(&os->os_lock, NULL, MUTEX_DEFAULT, NULL); mutex_init(&os->os_obj_lock, NULL, MUTEX_DEFAULT, NULL); mutex_init(&os->os_user_ptr_lock, NULL, MUTEX_DEFAULT, NULL); DMU_META_DNODE(os) = dnode_special_open(os, &os->os_phys->os_meta_dnode, DMU_META_DNODE_OBJECT, &os->os_meta_dnode); if (arc_buf_size(os->os_phys_buf) >= sizeof (objset_phys_t)) { DMU_USERUSED_DNODE(os) = dnode_special_open(os, &os->os_phys->os_userused_dnode, DMU_USERUSED_OBJECT, &os->os_userused_dnode); DMU_GROUPUSED_DNODE(os) = dnode_special_open(os, &os->os_phys->os_groupused_dnode, DMU_GROUPUSED_OBJECT, &os->os_groupused_dnode); } /* * We should be the only thread trying to do this because we * have ds_opening_lock */ if (ds) { mutex_enter(&ds->ds_lock); ASSERT(ds->ds_objset == NULL); ds->ds_objset = os; mutex_exit(&ds->ds_lock); } *osp = os; return (0); } int dmu_objset_from_ds(dsl_dataset_t *ds, objset_t **osp) { int err = 0; mutex_enter(&ds->ds_opening_lock); *osp = ds->ds_objset; if (*osp == NULL) { err = dmu_objset_open_impl(dsl_dataset_get_spa(ds), ds, &ds->ds_phys->ds_bp, osp); } mutex_exit(&ds->ds_opening_lock); return (err); } /* called from zpl */ int dmu_objset_hold(const char *name, void *tag, objset_t **osp) { dsl_dataset_t *ds; int err; err = dsl_dataset_hold(name, tag, &ds); if (err) return (err); err = dmu_objset_from_ds(ds, osp); if (err) dsl_dataset_rele(ds, tag); return (err); } /* called from zpl */ int dmu_objset_own(const char *name, dmu_objset_type_t type, boolean_t readonly, void *tag, objset_t **osp) { dsl_dataset_t *ds; int err; err = dsl_dataset_own(name, B_FALSE, tag, &ds); if (err) return (err); err = dmu_objset_from_ds(ds, osp); if (err) { dsl_dataset_disown(ds, tag); } else if (type != DMU_OST_ANY && type != (*osp)->os_phys->os_type) { dmu_objset_disown(*osp, tag); return (EINVAL); } else if (!readonly && dsl_dataset_is_snapshot(ds)) { dmu_objset_disown(*osp, tag); return (EROFS); } return (err); } void dmu_objset_rele(objset_t *os, void *tag) { dsl_dataset_rele(os->os_dsl_dataset, tag); } void dmu_objset_disown(objset_t *os, void *tag) { dsl_dataset_disown(os->os_dsl_dataset, tag); } int dmu_objset_evict_dbufs(objset_t *os) { dnode_t *dn; mutex_enter(&os->os_lock); /* process the mdn last, since the other dnodes have holds on it */ list_remove(&os->os_dnodes, DMU_META_DNODE(os)); list_insert_tail(&os->os_dnodes, DMU_META_DNODE(os)); /* * Find the first dnode with holds. We have to do this dance * because dnode_add_ref() only works if you already have a * hold. If there are no holds then it has no dbufs so OK to * skip. */ for (dn = list_head(&os->os_dnodes); dn && !dnode_add_ref(dn, FTAG); dn = list_next(&os->os_dnodes, dn)) continue; while (dn) { dnode_t *next_dn = dn; do { next_dn = list_next(&os->os_dnodes, next_dn); } while (next_dn && !dnode_add_ref(next_dn, FTAG)); mutex_exit(&os->os_lock); dnode_evict_dbufs(dn); dnode_rele(dn, FTAG); mutex_enter(&os->os_lock); dn = next_dn; } dn = list_head(&os->os_dnodes); mutex_exit(&os->os_lock); return (dn != DMU_META_DNODE(os)); } void dmu_objset_evict(objset_t *os) { dsl_dataset_t *ds = os->os_dsl_dataset; for (int t = 0; t < TXG_SIZE; t++) ASSERT(!dmu_objset_is_dirty(os, t)); if (ds) { if (!dsl_dataset_is_snapshot(ds)) { VERIFY(0 == dsl_prop_unregister(ds, "checksum", checksum_changed_cb, os)); VERIFY(0 == dsl_prop_unregister(ds, "compression", compression_changed_cb, os)); VERIFY(0 == dsl_prop_unregister(ds, "copies", copies_changed_cb, os)); VERIFY(0 == dsl_prop_unregister(ds, "dedup", dedup_changed_cb, os)); VERIFY(0 == dsl_prop_unregister(ds, "logbias", logbias_changed_cb, os)); VERIFY(0 == dsl_prop_unregister(ds, "sync", sync_changed_cb, os)); } VERIFY(0 == dsl_prop_unregister(ds, "primarycache", primary_cache_changed_cb, os)); VERIFY(0 == dsl_prop_unregister(ds, "secondarycache", secondary_cache_changed_cb, os)); } if (os->os_sa) sa_tear_down(os); /* * We should need only a single pass over the dnode list, since * nothing can be added to the list at this point. */ (void) dmu_objset_evict_dbufs(os); dnode_special_close(&os->os_meta_dnode); if (DMU_USERUSED_DNODE(os)) { dnode_special_close(&os->os_userused_dnode); dnode_special_close(&os->os_groupused_dnode); } zil_free(os->os_zil); ASSERT3P(list_head(&os->os_dnodes), ==, NULL); VERIFY(arc_buf_remove_ref(os->os_phys_buf, &os->os_phys_buf) == 1); /* * This is a barrier to prevent the objset from going away in * dnode_move() until we can safely ensure that the objset is still in * use. We consider the objset valid before the barrier and invalid * after the barrier. */ rw_enter(&os_lock, RW_READER); rw_exit(&os_lock); mutex_destroy(&os->os_lock); mutex_destroy(&os->os_obj_lock); mutex_destroy(&os->os_user_ptr_lock); kmem_free(os, sizeof (objset_t)); } timestruc_t dmu_objset_snap_cmtime(objset_t *os) { return (dsl_dir_snap_cmtime(os->os_dsl_dataset->ds_dir)); } /* called from dsl for meta-objset */ objset_t * dmu_objset_create_impl(spa_t *spa, dsl_dataset_t *ds, blkptr_t *bp, dmu_objset_type_t type, dmu_tx_t *tx) { objset_t *os; dnode_t *mdn; ASSERT(dmu_tx_is_syncing(tx)); if (ds) mutex_enter(&ds->ds_opening_lock); VERIFY(0 == dmu_objset_open_impl(spa, ds, bp, &os)); if (ds) mutex_exit(&ds->ds_opening_lock); mdn = DMU_META_DNODE(os); dnode_allocate(mdn, DMU_OT_DNODE, 1 << DNODE_BLOCK_SHIFT, DN_MAX_INDBLKSHIFT, DMU_OT_NONE, 0, tx); /* * We don't want to have to increase the meta-dnode's nlevels * later, because then we could do it in quescing context while * we are also accessing it in open context. * * This precaution is not necessary for the MOS (ds == NULL), * because the MOS is only updated in syncing context. * This is most fortunate: the MOS is the only objset that * needs to be synced multiple times as spa_sync() iterates * to convergence, so minimizing its dn_nlevels matters. */ if (ds != NULL) { int levels = 1; /* * Determine the number of levels necessary for the meta-dnode * to contain DN_MAX_OBJECT dnodes. */ while ((uint64_t)mdn->dn_nblkptr << (mdn->dn_datablkshift + (levels - 1) * (mdn->dn_indblkshift - SPA_BLKPTRSHIFT)) < DN_MAX_OBJECT * sizeof (dnode_phys_t)) levels++; mdn->dn_next_nlevels[tx->tx_txg & TXG_MASK] = mdn->dn_nlevels = levels; } ASSERT(type != DMU_OST_NONE); ASSERT(type != DMU_OST_ANY); ASSERT(type < DMU_OST_NUMTYPES); os->os_phys->os_type = type; if (dmu_objset_userused_enabled(os)) { os->os_phys->os_flags |= OBJSET_FLAG_USERACCOUNTING_COMPLETE; os->os_flags = os->os_phys->os_flags; } dsl_dataset_dirty(ds, tx); return (os); } struct oscarg { void (*userfunc)(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx); void *userarg; dsl_dataset_t *clone_origin; const char *lastname; dmu_objset_type_t type; uint64_t flags; cred_t *cr; }; /*ARGSUSED*/ static int dmu_objset_create_check(void *arg1, void *arg2, dmu_tx_t *tx) { dsl_dir_t *dd = arg1; struct oscarg *oa = arg2; objset_t *mos = dd->dd_pool->dp_meta_objset; int err; uint64_t ddobj; err = zap_lookup(mos, dd->dd_phys->dd_child_dir_zapobj, oa->lastname, sizeof (uint64_t), 1, &ddobj); if (err != ENOENT) return (err ? err : EEXIST); if (oa->clone_origin != NULL) { /* You can't clone across pools. */ if (oa->clone_origin->ds_dir->dd_pool != dd->dd_pool) return (EXDEV); /* You can only clone snapshots, not the head datasets. */ if (!dsl_dataset_is_snapshot(oa->clone_origin)) return (EINVAL); } return (0); } static void dmu_objset_create_sync(void *arg1, void *arg2, dmu_tx_t *tx) { dsl_dir_t *dd = arg1; struct oscarg *oa = arg2; uint64_t dsobj; ASSERT(dmu_tx_is_syncing(tx)); dsobj = dsl_dataset_create_sync(dd, oa->lastname, oa->clone_origin, oa->flags, oa->cr, tx); if (oa->clone_origin == NULL) { dsl_dataset_t *ds; blkptr_t *bp; objset_t *os; VERIFY(0 == dsl_dataset_hold_obj(dd->dd_pool, dsobj, FTAG, &ds)); bp = dsl_dataset_get_blkptr(ds); ASSERT(BP_IS_HOLE(bp)); os = dmu_objset_create_impl(dsl_dataset_get_spa(ds), ds, bp, oa->type, tx); if (oa->userfunc) oa->userfunc(os, oa->userarg, oa->cr, tx); dsl_dataset_rele(ds, FTAG); } spa_history_log_internal(LOG_DS_CREATE, dd->dd_pool->dp_spa, tx, "dataset = %llu", dsobj); } int dmu_objset_create(const char *name, dmu_objset_type_t type, uint64_t flags, void (*func)(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx), void *arg) { dsl_dir_t *pdd; const char *tail; int err = 0; struct oscarg oa = { 0 }; ASSERT(strchr(name, '@') == NULL); err = dsl_dir_open(name, FTAG, &pdd, &tail); if (err) return (err); if (tail == NULL) { dsl_dir_close(pdd, FTAG); return (EEXIST); } oa.userfunc = func; oa.userarg = arg; oa.lastname = tail; oa.type = type; oa.flags = flags; oa.cr = CRED(); err = dsl_sync_task_do(pdd->dd_pool, dmu_objset_create_check, dmu_objset_create_sync, pdd, &oa, 5); dsl_dir_close(pdd, FTAG); return (err); } int dmu_objset_clone(const char *name, dsl_dataset_t *clone_origin, uint64_t flags) { dsl_dir_t *pdd; const char *tail; int err = 0; struct oscarg oa = { 0 }; ASSERT(strchr(name, '@') == NULL); err = dsl_dir_open(name, FTAG, &pdd, &tail); if (err) return (err); if (tail == NULL) { dsl_dir_close(pdd, FTAG); return (EEXIST); } oa.lastname = tail; oa.clone_origin = clone_origin; oa.flags = flags; oa.cr = CRED(); err = dsl_sync_task_do(pdd->dd_pool, dmu_objset_create_check, dmu_objset_create_sync, pdd, &oa, 5); dsl_dir_close(pdd, FTAG); return (err); } int dmu_objset_destroy(const char *name, boolean_t defer) { dsl_dataset_t *ds; int error; /* * dsl_dataset_destroy() can free any claimed-but-unplayed * intent log, but if there is an active log, it has blocks that * are allocated, but may not yet be reflected in the on-disk * structure. Only the ZIL knows how to free them, so we have * to call into it here. */ error = dsl_dataset_own(name, B_TRUE, FTAG, &ds); if (error == 0) { objset_t *os; if (dmu_objset_from_ds(ds, &os) == 0) zil_destroy(dmu_objset_zil(os), B_FALSE); error = dsl_dataset_destroy(ds, FTAG, defer); /* dsl_dataset_destroy() closes the ds. */ } return (error); } struct snaparg { dsl_sync_task_group_t *dstg; char *snapname; char failed[MAXPATHLEN]; boolean_t recursive; nvlist_t *props; }; static int snapshot_check(void *arg1, void *arg2, dmu_tx_t *tx) { objset_t *os = arg1; struct snaparg *sn = arg2; /* The props have already been checked by zfs_check_userprops(). */ return (dsl_dataset_snapshot_check(os->os_dsl_dataset, sn->snapname, tx)); } static void snapshot_sync(void *arg1, void *arg2, dmu_tx_t *tx) { objset_t *os = arg1; dsl_dataset_t *ds = os->os_dsl_dataset; struct snaparg *sn = arg2; dsl_dataset_snapshot_sync(ds, sn->snapname, tx); if (sn->props) { dsl_props_arg_t pa; pa.pa_props = sn->props; pa.pa_source = ZPROP_SRC_LOCAL; dsl_props_set_sync(ds->ds_prev, &pa, tx); } } static int dmu_objset_snapshot_one(const char *name, void *arg) { struct snaparg *sn = arg; objset_t *os; int err; char *cp; /* * If the objset starts with a '%', then ignore it unless it was * explicitly named (ie, not recursive). These hidden datasets * are always inconsistent, and by not opening them here, we can * avoid a race with dsl_dir_destroy_check(). */ cp = strrchr(name, '/'); if (cp && cp[1] == '%' && sn->recursive) return (0); (void) strcpy(sn->failed, name); /* * Check permissions if we are doing a recursive snapshot. The * permission checks for the starting dataset have already been * performed in zfs_secpolicy_snapshot() */ if (sn->recursive && (err = zfs_secpolicy_snapshot_perms(name, CRED()))) return (err); err = dmu_objset_hold(name, sn, &os); if (err != 0) return (err); /* * If the objset is in an inconsistent state (eg, in the process * of being destroyed), don't snapshot it. As with %hidden * datasets, we return EBUSY if this name was explicitly * requested (ie, not recursive), and otherwise ignore it. */ if (os->os_dsl_dataset->ds_phys->ds_flags & DS_FLAG_INCONSISTENT) { dmu_objset_rele(os, sn); return (sn->recursive ? 0 : EBUSY); } /* * NB: we need to wait for all in-flight changes to get to disk, * so that we snapshot those changes. zil_suspend does this as * a side effect. */ err = zil_suspend(dmu_objset_zil(os)); if (err == 0) { dsl_sync_task_create(sn->dstg, snapshot_check, snapshot_sync, os, sn, 3); } else { dmu_objset_rele(os, sn); } return (err); } int dmu_objset_snapshot(char *fsname, char *snapname, nvlist_t *props, boolean_t recursive) { dsl_sync_task_t *dst; struct snaparg sn; spa_t *spa; int err; (void) strcpy(sn.failed, fsname); err = spa_open(fsname, &spa, FTAG); if (err) return (err); sn.dstg = dsl_sync_task_group_create(spa_get_dsl(spa)); sn.snapname = snapname; sn.props = props; sn.recursive = recursive; if (recursive) { err = dmu_objset_find(fsname, dmu_objset_snapshot_one, &sn, DS_FIND_CHILDREN); } else { err = dmu_objset_snapshot_one(fsname, &sn); } if (err == 0) err = dsl_sync_task_group_wait(sn.dstg); for (dst = list_head(&sn.dstg->dstg_tasks); dst; dst = list_next(&sn.dstg->dstg_tasks, dst)) { objset_t *os = dst->dst_arg1; dsl_dataset_t *ds = os->os_dsl_dataset; if (dst->dst_err) dsl_dataset_name(ds, sn.failed); zil_resume(dmu_objset_zil(os)); dmu_objset_rele(os, &sn); } if (err) (void) strcpy(fsname, sn.failed); dsl_sync_task_group_destroy(sn.dstg); spa_close(spa, FTAG); return (err); } static void dmu_objset_sync_dnodes(list_t *list, list_t *newlist, dmu_tx_t *tx) { dnode_t *dn; while (dn = list_head(list)) { ASSERT(dn->dn_object != DMU_META_DNODE_OBJECT); ASSERT(dn->dn_dbuf->db_data_pending); /* * Initialize dn_zio outside dnode_sync() because the * meta-dnode needs to set it ouside dnode_sync(). */ dn->dn_zio = dn->dn_dbuf->db_data_pending->dr_zio; ASSERT(dn->dn_zio); ASSERT3U(dn->dn_nlevels, <=, DN_MAX_LEVELS); list_remove(list, dn); if (newlist) { (void) dnode_add_ref(dn, newlist); list_insert_tail(newlist, dn); } dnode_sync(dn, tx); } } /* ARGSUSED */ static void dmu_objset_write_ready(zio_t *zio, arc_buf_t *abuf, void *arg) { blkptr_t *bp = zio->io_bp; objset_t *os = arg; dnode_phys_t *dnp = &os->os_phys->os_meta_dnode; ASSERT(bp == os->os_rootbp); ASSERT(BP_GET_TYPE(bp) == DMU_OT_OBJSET); ASSERT(BP_GET_LEVEL(bp) == 0); /* * Update rootbp fill count: it should be the number of objects * allocated in the object set (not counting the "special" * objects that are stored in the objset_phys_t -- the meta * dnode and user/group accounting objects). */ bp->blk_fill = 0; for (int i = 0; i < dnp->dn_nblkptr; i++) bp->blk_fill += dnp->dn_blkptr[i].blk_fill; } /* ARGSUSED */ static void dmu_objset_write_done(zio_t *zio, arc_buf_t *abuf, void *arg) { blkptr_t *bp = zio->io_bp; blkptr_t *bp_orig = &zio->io_bp_orig; objset_t *os = arg; if (zio->io_flags & ZIO_FLAG_IO_REWRITE) { ASSERT(BP_EQUAL(bp, bp_orig)); } else { dsl_dataset_t *ds = os->os_dsl_dataset; dmu_tx_t *tx = os->os_synctx; (void) dsl_dataset_block_kill(ds, bp_orig, tx, B_TRUE); dsl_dataset_block_born(ds, bp, tx); } } /* called from dsl */ void dmu_objset_sync(objset_t *os, zio_t *pio, dmu_tx_t *tx) { int txgoff; zbookmark_t zb; zio_prop_t zp; zio_t *zio; list_t *list; list_t *newlist = NULL; dbuf_dirty_record_t *dr; dprintf_ds(os->os_dsl_dataset, "txg=%llu\n", tx->tx_txg); ASSERT(dmu_tx_is_syncing(tx)); /* XXX the write_done callback should really give us the tx... */ os->os_synctx = tx; if (os->os_dsl_dataset == NULL) { /* * This is the MOS. If we have upgraded, * spa_max_replication() could change, so reset * os_copies here. */ os->os_copies = spa_max_replication(os->os_spa); } /* * Create the root block IO */ SET_BOOKMARK(&zb, os->os_dsl_dataset ? os->os_dsl_dataset->ds_object : DMU_META_OBJSET, ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID); VERIFY3U(0, ==, arc_release_bp(os->os_phys_buf, &os->os_phys_buf, os->os_rootbp, os->os_spa, &zb)); dmu_write_policy(os, NULL, 0, 0, &zp); zio = arc_write(pio, os->os_spa, tx->tx_txg, os->os_rootbp, os->os_phys_buf, DMU_OS_IS_L2CACHEABLE(os), &zp, dmu_objset_write_ready, dmu_objset_write_done, os, ZIO_PRIORITY_ASYNC_WRITE, ZIO_FLAG_MUSTSUCCEED, &zb); /* * Sync special dnodes - the parent IO for the sync is the root block */ DMU_META_DNODE(os)->dn_zio = zio; dnode_sync(DMU_META_DNODE(os), tx); os->os_phys->os_flags = os->os_flags; if (DMU_USERUSED_DNODE(os) && DMU_USERUSED_DNODE(os)->dn_type != DMU_OT_NONE) { DMU_USERUSED_DNODE(os)->dn_zio = zio; dnode_sync(DMU_USERUSED_DNODE(os), tx); DMU_GROUPUSED_DNODE(os)->dn_zio = zio; dnode_sync(DMU_GROUPUSED_DNODE(os), tx); } txgoff = tx->tx_txg & TXG_MASK; if (dmu_objset_userused_enabled(os)) { newlist = &os->os_synced_dnodes; /* * We must create the list here because it uses the * dn_dirty_link[] of this txg. */ list_create(newlist, sizeof (dnode_t), offsetof(dnode_t, dn_dirty_link[txgoff])); } dmu_objset_sync_dnodes(&os->os_free_dnodes[txgoff], newlist, tx); dmu_objset_sync_dnodes(&os->os_dirty_dnodes[txgoff], newlist, tx); list = &DMU_META_DNODE(os)->dn_dirty_records[txgoff]; while (dr = list_head(list)) { ASSERT(dr->dr_dbuf->db_level == 0); list_remove(list, dr); if (dr->dr_zio) zio_nowait(dr->dr_zio); } /* * Free intent log blocks up to this tx. */ zil_sync(os->os_zil, tx); os->os_phys->os_zil_header = os->os_zil_header; zio_nowait(zio); } boolean_t dmu_objset_is_dirty(objset_t *os, uint64_t txg) { return (!list_is_empty(&os->os_dirty_dnodes[txg & TXG_MASK]) || !list_is_empty(&os->os_free_dnodes[txg & TXG_MASK])); } boolean_t dmu_objset_is_dirty_anywhere(objset_t *os) { for (int t = 0; t < TXG_SIZE; t++) if (dmu_objset_is_dirty(os, t)) return (B_TRUE); return (B_FALSE); } static objset_used_cb_t *used_cbs[DMU_OST_NUMTYPES]; void dmu_objset_register_type(dmu_objset_type_t ost, objset_used_cb_t *cb) { used_cbs[ost] = cb; } boolean_t dmu_objset_userused_enabled(objset_t *os) { return (spa_version(os->os_spa) >= SPA_VERSION_USERSPACE && used_cbs[os->os_phys->os_type] != NULL && DMU_USERUSED_DNODE(os) != NULL); } static void do_userquota_update(objset_t *os, uint64_t used, uint64_t flags, uint64_t user, uint64_t group, boolean_t subtract, dmu_tx_t *tx) { if ((flags & DNODE_FLAG_USERUSED_ACCOUNTED)) { int64_t delta = DNODE_SIZE + used; if (subtract) delta = -delta; VERIFY3U(0, ==, zap_increment_int(os, DMU_USERUSED_OBJECT, user, delta, tx)); VERIFY3U(0, ==, zap_increment_int(os, DMU_GROUPUSED_OBJECT, group, delta, tx)); } } void dmu_objset_do_userquota_updates(objset_t *os, dmu_tx_t *tx) { dnode_t *dn; list_t *list = &os->os_synced_dnodes; ASSERT(list_head(list) == NULL || dmu_objset_userused_enabled(os)); while (dn = list_head(list)) { int flags; ASSERT(!DMU_OBJECT_IS_SPECIAL(dn->dn_object)); ASSERT(dn->dn_phys->dn_type == DMU_OT_NONE || dn->dn_phys->dn_flags & DNODE_FLAG_USERUSED_ACCOUNTED); /* Allocate the user/groupused objects if necessary. */ if (DMU_USERUSED_DNODE(os)->dn_type == DMU_OT_NONE) { VERIFY(0 == zap_create_claim(os, DMU_USERUSED_OBJECT, DMU_OT_USERGROUP_USED, DMU_OT_NONE, 0, tx)); VERIFY(0 == zap_create_claim(os, DMU_GROUPUSED_OBJECT, DMU_OT_USERGROUP_USED, DMU_OT_NONE, 0, tx)); } /* * We intentionally modify the zap object even if the * net delta is zero. Otherwise * the block of the zap obj could be shared between * datasets but need to be different between them after * a bprewrite. */ flags = dn->dn_id_flags; ASSERT(flags); if (flags & DN_ID_OLD_EXIST) { do_userquota_update(os, dn->dn_oldused, dn->dn_oldflags, dn->dn_olduid, dn->dn_oldgid, B_TRUE, tx); } if (flags & DN_ID_NEW_EXIST) { do_userquota_update(os, DN_USED_BYTES(dn->dn_phys), dn->dn_phys->dn_flags, dn->dn_newuid, dn->dn_newgid, B_FALSE, tx); } mutex_enter(&dn->dn_mtx); dn->dn_oldused = 0; dn->dn_oldflags = 0; if (dn->dn_id_flags & DN_ID_NEW_EXIST) { dn->dn_olduid = dn->dn_newuid; dn->dn_oldgid = dn->dn_newgid; dn->dn_id_flags |= DN_ID_OLD_EXIST; if (dn->dn_bonuslen == 0) dn->dn_id_flags |= DN_ID_CHKED_SPILL; else dn->dn_id_flags |= DN_ID_CHKED_BONUS; } dn->dn_id_flags &= ~(DN_ID_NEW_EXIST); mutex_exit(&dn->dn_mtx); list_remove(list, dn); dnode_rele(dn, list); } } /* * Returns a pointer to data to find uid/gid from * * If a dirty record for transaction group that is syncing can't * be found then NULL is returned. In the NULL case it is assumed * the uid/gid aren't changing. */ static void * dmu_objset_userquota_find_data(dmu_buf_impl_t *db, dmu_tx_t *tx) { dbuf_dirty_record_t *dr, **drp; void *data; if (db->db_dirtycnt == 0) return (db->db.db_data); /* Nothing is changing */ for (drp = &db->db_last_dirty; (dr = *drp) != NULL; drp = &dr->dr_next) if (dr->dr_txg == tx->tx_txg) break; if (dr == NULL) { data = NULL; } else { dnode_t *dn; DB_DNODE_ENTER(dr->dr_dbuf); dn = DB_DNODE(dr->dr_dbuf); if (dn->dn_bonuslen == 0 && dr->dr_dbuf->db_blkid == DMU_SPILL_BLKID) data = dr->dt.dl.dr_data->b_data; else data = dr->dt.dl.dr_data; DB_DNODE_EXIT(dr->dr_dbuf); } return (data); } void dmu_objset_userquota_get_ids(dnode_t *dn, boolean_t before, dmu_tx_t *tx) { objset_t *os = dn->dn_objset; void *data = NULL; dmu_buf_impl_t *db = NULL; uint64_t *user, *group; int flags = dn->dn_id_flags; int error; boolean_t have_spill = B_FALSE; if (!dmu_objset_userused_enabled(dn->dn_objset)) return; if (before && (flags & (DN_ID_CHKED_BONUS|DN_ID_OLD_EXIST| DN_ID_CHKED_SPILL))) return; if (before && dn->dn_bonuslen != 0) data = DN_BONUS(dn->dn_phys); else if (!before && dn->dn_bonuslen != 0) { if (dn->dn_bonus) { db = dn->dn_bonus; mutex_enter(&db->db_mtx); data = dmu_objset_userquota_find_data(db, tx); } else { data = DN_BONUS(dn->dn_phys); } } else if (dn->dn_bonuslen == 0 && dn->dn_bonustype == DMU_OT_SA) { int rf = 0; if (RW_WRITE_HELD(&dn->dn_struct_rwlock)) rf |= DB_RF_HAVESTRUCT; error = dmu_spill_hold_by_dnode(dn, rf | DB_RF_MUST_SUCCEED, FTAG, (dmu_buf_t **)&db); ASSERT(error == 0); mutex_enter(&db->db_mtx); data = (before) ? db->db.db_data : dmu_objset_userquota_find_data(db, tx); have_spill = B_TRUE; } else { mutex_enter(&dn->dn_mtx); dn->dn_id_flags |= DN_ID_CHKED_BONUS; mutex_exit(&dn->dn_mtx); return; } if (before) { ASSERT(data); user = &dn->dn_olduid; group = &dn->dn_oldgid; } else if (data) { user = &dn->dn_newuid; group = &dn->dn_newgid; } /* * Must always call the callback in case the object * type has changed and that type isn't an object type to track */ error = used_cbs[os->os_phys->os_type](dn->dn_bonustype, data, user, group); /* * Preserve existing uid/gid when the callback can't determine * what the new uid/gid are and the callback returned EEXIST. * The EEXIST error tells us to just use the existing uid/gid. * If we don't know what the old values are then just assign * them to 0, since that is a new file being created. */ if (!before && data == NULL && error == EEXIST) { if (flags & DN_ID_OLD_EXIST) { dn->dn_newuid = dn->dn_olduid; dn->dn_newgid = dn->dn_oldgid; } else { dn->dn_newuid = 0; dn->dn_newgid = 0; } error = 0; } if (db) mutex_exit(&db->db_mtx); mutex_enter(&dn->dn_mtx); if (error == 0 && before) dn->dn_id_flags |= DN_ID_OLD_EXIST; if (error == 0 && !before) dn->dn_id_flags |= DN_ID_NEW_EXIST; if (have_spill) { dn->dn_id_flags |= DN_ID_CHKED_SPILL; } else { dn->dn_id_flags |= DN_ID_CHKED_BONUS; } mutex_exit(&dn->dn_mtx); if (have_spill) dmu_buf_rele((dmu_buf_t *)db, FTAG); } boolean_t dmu_objset_userspace_present(objset_t *os) { return (os->os_phys->os_flags & OBJSET_FLAG_USERACCOUNTING_COMPLETE); } int dmu_objset_userspace_upgrade(objset_t *os) { uint64_t obj; int err = 0; if (dmu_objset_userspace_present(os)) return (0); if (!dmu_objset_userused_enabled(os)) return (ENOTSUP); if (dmu_objset_is_snapshot(os)) return (EINVAL); /* * We simply need to mark every object dirty, so that it will be * synced out and now accounted. If this is called * concurrently, or if we already did some work before crashing, * that's fine, since we track each object's accounted state * independently. */ for (obj = 0; err == 0; err = dmu_object_next(os, &obj, FALSE, 0)) { dmu_tx_t *tx; dmu_buf_t *db; int objerr; if (issig(JUSTLOOKING) && issig(FORREAL)) return (EINTR); objerr = dmu_bonus_hold(os, obj, FTAG, &db); if (objerr) continue; tx = dmu_tx_create(os); dmu_tx_hold_bonus(tx, obj); objerr = dmu_tx_assign(tx, TXG_WAIT); if (objerr) { dmu_tx_abort(tx); continue; } dmu_buf_will_dirty(db, tx); dmu_buf_rele(db, FTAG); dmu_tx_commit(tx); } os->os_flags |= OBJSET_FLAG_USERACCOUNTING_COMPLETE; txg_wait_synced(dmu_objset_pool(os), 0); return (0); } void dmu_objset_space(objset_t *os, uint64_t *refdbytesp, uint64_t *availbytesp, uint64_t *usedobjsp, uint64_t *availobjsp) { dsl_dataset_space(os->os_dsl_dataset, refdbytesp, availbytesp, usedobjsp, availobjsp); } uint64_t dmu_objset_fsid_guid(objset_t *os) { return (dsl_dataset_fsid_guid(os->os_dsl_dataset)); } void dmu_objset_fast_stat(objset_t *os, dmu_objset_stats_t *stat) { stat->dds_type = os->os_phys->os_type; if (os->os_dsl_dataset) dsl_dataset_fast_stat(os->os_dsl_dataset, stat); } void dmu_objset_stats(objset_t *os, nvlist_t *nv) { ASSERT(os->os_dsl_dataset || os->os_phys->os_type == DMU_OST_META); if (os->os_dsl_dataset != NULL) dsl_dataset_stats(os->os_dsl_dataset, nv); dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_TYPE, os->os_phys->os_type); dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERACCOUNTING, dmu_objset_userspace_present(os)); } int dmu_objset_is_snapshot(objset_t *os) { if (os->os_dsl_dataset != NULL) return (dsl_dataset_is_snapshot(os->os_dsl_dataset)); else return (B_FALSE); } int dmu_snapshot_realname(objset_t *os, char *name, char *real, int maxlen, boolean_t *conflict) { dsl_dataset_t *ds = os->os_dsl_dataset; uint64_t ignored; if (ds->ds_phys->ds_snapnames_zapobj == 0) return (ENOENT); return (zap_lookup_norm(ds->ds_dir->dd_pool->dp_meta_objset, ds->ds_phys->ds_snapnames_zapobj, name, 8, 1, &ignored, MT_FIRST, real, maxlen, conflict)); } int dmu_snapshot_list_next(objset_t *os, int namelen, char *name, uint64_t *idp, uint64_t *offp, boolean_t *case_conflict) { dsl_dataset_t *ds = os->os_dsl_dataset; zap_cursor_t cursor; zap_attribute_t attr; if (ds->ds_phys->ds_snapnames_zapobj == 0) return (ENOENT); zap_cursor_init_serialized(&cursor, ds->ds_dir->dd_pool->dp_meta_objset, ds->ds_phys->ds_snapnames_zapobj, *offp); if (zap_cursor_retrieve(&cursor, &attr) != 0) { zap_cursor_fini(&cursor); return (ENOENT); } if (strlen(attr.za_name) + 1 > namelen) { zap_cursor_fini(&cursor); return (ENAMETOOLONG); } (void) strcpy(name, attr.za_name); if (idp) *idp = attr.za_first_integer; if (case_conflict) *case_conflict = attr.za_normalization_conflict; zap_cursor_advance(&cursor); *offp = zap_cursor_serialize(&cursor); zap_cursor_fini(&cursor); return (0); } int dmu_dir_list_next(objset_t *os, int namelen, char *name, uint64_t *idp, uint64_t *offp) { dsl_dir_t *dd = os->os_dsl_dataset->ds_dir; zap_cursor_t cursor; zap_attribute_t attr; /* there is no next dir on a snapshot! */ if (os->os_dsl_dataset->ds_object != dd->dd_phys->dd_head_dataset_obj) return (ENOENT); zap_cursor_init_serialized(&cursor, dd->dd_pool->dp_meta_objset, dd->dd_phys->dd_child_dir_zapobj, *offp); if (zap_cursor_retrieve(&cursor, &attr) != 0) { zap_cursor_fini(&cursor); return (ENOENT); } if (strlen(attr.za_name) + 1 > namelen) { zap_cursor_fini(&cursor); return (ENAMETOOLONG); } (void) strcpy(name, attr.za_name); if (idp) *idp = attr.za_first_integer; zap_cursor_advance(&cursor); *offp = zap_cursor_serialize(&cursor); zap_cursor_fini(&cursor); return (0); } struct findarg { int (*func)(const char *, void *); void *arg; }; /* ARGSUSED */ static int findfunc(spa_t *spa, uint64_t dsobj, const char *dsname, void *arg) { struct findarg *fa = arg; return (fa->func(dsname, fa->arg)); } /* * Find all objsets under name, and for each, call 'func(child_name, arg)'. * Perhaps change all callers to use dmu_objset_find_spa()? */ int dmu_objset_find(char *name, int func(const char *, void *), void *arg, int flags) { struct findarg fa; fa.func = func; fa.arg = arg; return (dmu_objset_find_spa(NULL, name, findfunc, &fa, flags)); } /* * Find all objsets under name, call func on each */ int dmu_objset_find_spa(spa_t *spa, const char *name, int func(spa_t *, uint64_t, const char *, void *), void *arg, int flags) { dsl_dir_t *dd; dsl_pool_t *dp; dsl_dataset_t *ds; zap_cursor_t zc; zap_attribute_t *attr; char *child; uint64_t thisobj; int err; if (name == NULL) name = spa_name(spa); err = dsl_dir_open_spa(spa, name, FTAG, &dd, NULL); if (err) return (err); /* Don't visit hidden ($MOS & $ORIGIN) objsets. */ if (dd->dd_myname[0] == '$') { dsl_dir_close(dd, FTAG); return (0); } thisobj = dd->dd_phys->dd_head_dataset_obj; attr = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP); dp = dd->dd_pool; /* * Iterate over all children. */ if (flags & DS_FIND_CHILDREN) { for (zap_cursor_init(&zc, dp->dp_meta_objset, dd->dd_phys->dd_child_dir_zapobj); zap_cursor_retrieve(&zc, attr) == 0; (void) zap_cursor_advance(&zc)) { ASSERT(attr->za_integer_length == sizeof (uint64_t)); ASSERT(attr->za_num_integers == 1); child = kmem_asprintf("%s/%s", name, attr->za_name); err = dmu_objset_find_spa(spa, child, func, arg, flags); strfree(child); if (err) break; } zap_cursor_fini(&zc); if (err) { dsl_dir_close(dd, FTAG); kmem_free(attr, sizeof (zap_attribute_t)); return (err); } } /* * Iterate over all snapshots. */ if (flags & DS_FIND_SNAPSHOTS) { if (!dsl_pool_sync_context(dp)) rw_enter(&dp->dp_config_rwlock, RW_READER); err = dsl_dataset_hold_obj(dp, thisobj, FTAG, &ds); if (!dsl_pool_sync_context(dp)) rw_exit(&dp->dp_config_rwlock); if (err == 0) { uint64_t snapobj = ds->ds_phys->ds_snapnames_zapobj; dsl_dataset_rele(ds, FTAG); for (zap_cursor_init(&zc, dp->dp_meta_objset, snapobj); zap_cursor_retrieve(&zc, attr) == 0; (void) zap_cursor_advance(&zc)) { ASSERT(attr->za_integer_length == sizeof (uint64_t)); ASSERT(attr->za_num_integers == 1); child = kmem_asprintf("%s@%s", name, attr->za_name); err = func(spa, attr->za_first_integer, child, arg); strfree(child); if (err) break; } zap_cursor_fini(&zc); } } dsl_dir_close(dd, FTAG); kmem_free(attr, sizeof (zap_attribute_t)); if (err) return (err); /* * Apply to self if appropriate. */ err = func(spa, thisobj, name, arg); return (err); } /* ARGSUSED */ int dmu_objset_prefetch(const char *name, void *arg) { dsl_dataset_t *ds; if (dsl_dataset_hold(name, FTAG, &ds)) return (0); if (!BP_IS_HOLE(&ds->ds_phys->ds_bp)) { mutex_enter(&ds->ds_opening_lock); if (ds->ds_objset == NULL) { uint32_t aflags = ARC_NOWAIT | ARC_PREFETCH; zbookmark_t zb; SET_BOOKMARK(&zb, ds->ds_object, ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID); (void) dsl_read_nolock(NULL, dsl_dataset_get_spa(ds), &ds->ds_phys->ds_bp, NULL, NULL, ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, &aflags, &zb); } mutex_exit(&ds->ds_opening_lock); } dsl_dataset_rele(ds, FTAG); return (0); } void dmu_objset_set_user(objset_t *os, void *user_ptr) { ASSERT(MUTEX_HELD(&os->os_user_ptr_lock)); os->os_user_ptr = user_ptr; } void * dmu_objset_get_user(objset_t *os) { ASSERT(MUTEX_HELD(&os->os_user_ptr_lock)); return (os->os_user_ptr); }