/* * 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 2009 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include spa_t * dmu_objset_spa(objset_t *os) { return (os->os->os_spa); } zilog_t * dmu_objset_zil(objset_t *os) { return (os->os->os_zil); } dsl_pool_t * dmu_objset_pool(objset_t *os) { dsl_dataset_t *ds; if ((ds = os->os->os_dsl_dataset) != NULL && ds->ds_dir) return (ds->ds_dir->dd_pool); else return (spa_get_dsl(os->os->os_spa)); } dsl_dataset_t * dmu_objset_ds(objset_t *os) { return (os->os->os_dsl_dataset); } dmu_objset_type_t dmu_objset_type(objset_t *os) { return (os->os->os_phys->os_type); } void dmu_objset_name(objset_t *os, char *buf) { dsl_dataset_name(os->os->os_dsl_dataset, buf); } uint64_t dmu_objset_id(objset_t *os) { dsl_dataset_t *ds = os->os->os_dsl_dataset; return (ds ? ds->ds_object : 0); } static void checksum_changed_cb(void *arg, uint64_t newval) { objset_impl_t *osi = arg; /* * Inheritance should have been done by now. */ ASSERT(newval != ZIO_CHECKSUM_INHERIT); osi->os_checksum = zio_checksum_select(newval, ZIO_CHECKSUM_ON_VALUE); } static void compression_changed_cb(void *arg, uint64_t newval) { objset_impl_t *osi = arg; /* * Inheritance and range checking should have been done by now. */ ASSERT(newval != ZIO_COMPRESS_INHERIT); osi->os_compress = zio_compress_select(newval, ZIO_COMPRESS_ON_VALUE); } static void copies_changed_cb(void *arg, uint64_t newval) { objset_impl_t *osi = arg; /* * Inheritance and range checking should have been done by now. */ ASSERT(newval > 0); ASSERT(newval <= spa_max_replication(osi->os_spa)); osi->os_copies = newval; } static void primary_cache_changed_cb(void *arg, uint64_t newval) { objset_impl_t *osi = arg; /* * Inheritance and range checking should have been done by now. */ ASSERT(newval == ZFS_CACHE_ALL || newval == ZFS_CACHE_NONE || newval == ZFS_CACHE_METADATA); osi->os_primary_cache = newval; } static void secondary_cache_changed_cb(void *arg, uint64_t newval) { objset_impl_t *osi = arg; /* * Inheritance and range checking should have been done by now. */ ASSERT(newval == ZFS_CACHE_ALL || newval == ZFS_CACHE_NONE || newval == ZFS_CACHE_METADATA); osi->os_secondary_cache = newval; } void dmu_objset_byteswap(void *buf, size_t size) { objset_phys_t *osp = buf; ASSERT(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); } int dmu_objset_open_impl(spa_t *spa, dsl_dataset_t *ds, blkptr_t *bp, objset_impl_t **osip) { objset_impl_t *osi; int i, err; ASSERT(ds == NULL || MUTEX_HELD(&ds->ds_opening_lock)); osi = kmem_zalloc(sizeof (objset_impl_t), KM_SLEEP); osi->os.os = osi; osi->os_dsl_dataset = ds; osi->os_spa = spa; osi->os_rootbp = bp; if (!BP_IS_HOLE(osi->os_rootbp)) { uint32_t aflags = ARC_WAIT; zbookmark_t zb; zb.zb_objset = ds ? ds->ds_object : 0; zb.zb_object = 0; zb.zb_level = -1; zb.zb_blkid = 0; if (DMU_OS_IS_L2CACHEABLE(osi)) aflags |= ARC_L2CACHE; dprintf_bp(osi->os_rootbp, "reading %s", ""); /* * NB: 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 = arc_read_nolock(NULL, spa, osi->os_rootbp, arc_getbuf_func, &osi->os_phys_buf, ZIO_PRIORITY_SYNC_READ, ZIO_FLAG_CANFAIL, &aflags, &zb); if (err) { kmem_free(osi, sizeof (objset_impl_t)); /* convert checksum errors into IO errors */ if (err == ECKSUM) err = EIO; return (err); } osi->os_phys = osi->os_phys_buf->b_data; } else { osi->os_phys_buf = arc_buf_alloc(spa, sizeof (objset_phys_t), &osi->os_phys_buf, ARC_BUFC_METADATA); osi->os_phys = osi->os_phys_buf->b_data; bzero(osi->os_phys, sizeof (objset_phys_t)); } /* * 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, osi); if (err == 0) err = dsl_prop_register(ds, "secondarycache", secondary_cache_changed_cb, osi); if (!dsl_dataset_is_snapshot(ds)) { if (err == 0) err = dsl_prop_register(ds, "checksum", checksum_changed_cb, osi); if (err == 0) err = dsl_prop_register(ds, "compression", compression_changed_cb, osi); if (err == 0) err = dsl_prop_register(ds, "copies", copies_changed_cb, osi); } if (err) { VERIFY(arc_buf_remove_ref(osi->os_phys_buf, &osi->os_phys_buf) == 1); kmem_free(osi, sizeof (objset_impl_t)); return (err); } } else if (ds == NULL) { /* It's the meta-objset. */ osi->os_checksum = ZIO_CHECKSUM_FLETCHER_4; osi->os_compress = ZIO_COMPRESS_LZJB; osi->os_copies = spa_max_replication(spa); osi->os_primary_cache = ZFS_CACHE_ALL; osi->os_secondary_cache = ZFS_CACHE_ALL; } osi->os_zil_header = osi->os_phys->os_zil_header; osi->os_zil = zil_alloc(&osi->os, &osi->os_zil_header); for (i = 0; i < TXG_SIZE; i++) { list_create(&osi->os_dirty_dnodes[i], sizeof (dnode_t), offsetof(dnode_t, dn_dirty_link[i])); list_create(&osi->os_free_dnodes[i], sizeof (dnode_t), offsetof(dnode_t, dn_dirty_link[i])); } list_create(&osi->os_dnodes, sizeof (dnode_t), offsetof(dnode_t, dn_link)); list_create(&osi->os_downgraded_dbufs, sizeof (dmu_buf_impl_t), offsetof(dmu_buf_impl_t, db_link)); mutex_init(&osi->os_lock, NULL, MUTEX_DEFAULT, NULL); mutex_init(&osi->os_obj_lock, NULL, MUTEX_DEFAULT, NULL); mutex_init(&osi->os_user_ptr_lock, NULL, MUTEX_DEFAULT, NULL); osi->os_meta_dnode = dnode_special_open(osi, &osi->os_phys->os_meta_dnode, DMU_META_DNODE_OBJECT); /* * We should be the only thread trying to do this because we * have ds_opening_lock */ if (ds) { VERIFY(NULL == dsl_dataset_set_user_ptr(ds, osi, dmu_objset_evict)); } *osip = osi; return (0); } static int dmu_objset_open_ds_os(dsl_dataset_t *ds, objset_t *os, dmu_objset_type_t type) { objset_impl_t *osi; mutex_enter(&ds->ds_opening_lock); osi = dsl_dataset_get_user_ptr(ds); if (osi == NULL) { int err; err = dmu_objset_open_impl(dsl_dataset_get_spa(ds), ds, &ds->ds_phys->ds_bp, &osi); if (err) { mutex_exit(&ds->ds_opening_lock); return (err); } } mutex_exit(&ds->ds_opening_lock); os->os = osi; os->os_mode = DS_MODE_NOHOLD; if (type != DMU_OST_ANY && type != os->os->os_phys->os_type) return (EINVAL); return (0); } int dmu_objset_open_ds(dsl_dataset_t *ds, dmu_objset_type_t type, objset_t **osp) { objset_t *os; int err; os = kmem_alloc(sizeof (objset_t), KM_SLEEP); err = dmu_objset_open_ds_os(ds, os, type); if (err) kmem_free(os, sizeof (objset_t)); else *osp = os; return (err); } /* called from zpl */ int dmu_objset_open(const char *name, dmu_objset_type_t type, int mode, objset_t **osp) { objset_t *os; dsl_dataset_t *ds; int err; ASSERT(DS_MODE_TYPE(mode) == DS_MODE_USER || DS_MODE_TYPE(mode) == DS_MODE_OWNER); os = kmem_alloc(sizeof (objset_t), KM_SLEEP); if (DS_MODE_TYPE(mode) == DS_MODE_USER) err = dsl_dataset_hold(name, os, &ds); else err = dsl_dataset_own(name, mode, os, &ds); if (err) { kmem_free(os, sizeof (objset_t)); return (err); } err = dmu_objset_open_ds_os(ds, os, type); if (err) { if (DS_MODE_TYPE(mode) == DS_MODE_USER) dsl_dataset_rele(ds, os); else dsl_dataset_disown(ds, os); kmem_free(os, sizeof (objset_t)); } else { os->os_mode = mode; *osp = os; } return (err); } void dmu_objset_close(objset_t *os) { ASSERT(DS_MODE_TYPE(os->os_mode) == DS_MODE_USER || DS_MODE_TYPE(os->os_mode) == DS_MODE_OWNER || DS_MODE_TYPE(os->os_mode) == DS_MODE_NOHOLD); if (DS_MODE_TYPE(os->os_mode) == DS_MODE_USER) dsl_dataset_rele(os->os->os_dsl_dataset, os); else if (DS_MODE_TYPE(os->os_mode) == DS_MODE_OWNER) dsl_dataset_disown(os->os->os_dsl_dataset, os); kmem_free(os, sizeof (objset_t)); } int dmu_objset_evict_dbufs(objset_t *os) { objset_impl_t *osi = os->os; dnode_t *dn; mutex_enter(&osi->os_lock); /* process the mdn last, since the other dnodes have holds on it */ list_remove(&osi->os_dnodes, osi->os_meta_dnode); list_insert_tail(&osi->os_dnodes, osi->os_meta_dnode); /* * 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(&osi->os_dnodes); dn && !dnode_add_ref(dn, FTAG); dn = list_next(&osi->os_dnodes, dn)) continue; while (dn) { dnode_t *next_dn = dn; do { next_dn = list_next(&osi->os_dnodes, next_dn); } while (next_dn && !dnode_add_ref(next_dn, FTAG)); mutex_exit(&osi->os_lock); dnode_evict_dbufs(dn); dnode_rele(dn, FTAG); mutex_enter(&osi->os_lock); dn = next_dn; } mutex_exit(&osi->os_lock); return (list_head(&osi->os_dnodes) != osi->os_meta_dnode); } void dmu_objset_evict(dsl_dataset_t *ds, void *arg) { objset_impl_t *osi = arg; objset_t os; int i; for (i = 0; i < TXG_SIZE; i++) { ASSERT(list_head(&osi->os_dirty_dnodes[i]) == NULL); ASSERT(list_head(&osi->os_free_dnodes[i]) == NULL); } if (ds) { if (!dsl_dataset_is_snapshot(ds)) { VERIFY(0 == dsl_prop_unregister(ds, "checksum", checksum_changed_cb, osi)); VERIFY(0 == dsl_prop_unregister(ds, "compression", compression_changed_cb, osi)); VERIFY(0 == dsl_prop_unregister(ds, "copies", copies_changed_cb, osi)); } VERIFY(0 == dsl_prop_unregister(ds, "primarycache", primary_cache_changed_cb, osi)); VERIFY(0 == dsl_prop_unregister(ds, "secondarycache", secondary_cache_changed_cb, osi)); } /* * We should need only a single pass over the dnode list, since * nothing can be added to the list at this point. */ os.os = osi; (void) dmu_objset_evict_dbufs(&os); ASSERT3P(list_head(&osi->os_dnodes), ==, osi->os_meta_dnode); ASSERT3P(list_tail(&osi->os_dnodes), ==, osi->os_meta_dnode); ASSERT3P(list_head(&osi->os_meta_dnode->dn_dbufs), ==, NULL); dnode_special_close(osi->os_meta_dnode); zil_free(osi->os_zil); VERIFY(arc_buf_remove_ref(osi->os_phys_buf, &osi->os_phys_buf) == 1); mutex_destroy(&osi->os_lock); mutex_destroy(&osi->os_obj_lock); mutex_destroy(&osi->os_user_ptr_lock); kmem_free(osi, sizeof (objset_impl_t)); } /* called from dsl for meta-objset */ objset_impl_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_impl_t *osi; 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, &osi)); if (ds) mutex_exit(&ds->ds_opening_lock); mdn = osi->os_meta_dnode; 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); osi->os_phys->os_type = type; dsl_dataset_dirty(ds, tx); return (osi); } struct oscarg { void (*userfunc)(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx); void *userarg; dsl_dataset_t *clone_parent; const char *lastname; dmu_objset_type_t type; uint64_t flags; }; /*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_parent != NULL) { /* * You can't clone across pools. */ if (oa->clone_parent->ds_dir->dd_pool != dd->dd_pool) return (EXDEV); /* * You can only clone snapshots, not the head datasets. */ if (oa->clone_parent->ds_phys->ds_num_children == 0) return (EINVAL); } return (0); } static void dmu_objset_create_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) { dsl_dir_t *dd = arg1; struct oscarg *oa = arg2; dsl_dataset_t *ds; blkptr_t *bp; uint64_t dsobj; ASSERT(dmu_tx_is_syncing(tx)); dsobj = dsl_dataset_create_sync(dd, oa->lastname, oa->clone_parent, oa->flags, cr, tx); VERIFY(0 == dsl_dataset_hold_obj(dd->dd_pool, dsobj, FTAG, &ds)); bp = dsl_dataset_get_blkptr(ds); if (BP_IS_HOLE(bp)) { objset_impl_t *osi; /* This is an empty dmu_objset; not a clone. */ osi = dmu_objset_create_impl(dsl_dataset_get_spa(ds), ds, bp, oa->type, tx); if (oa->userfunc) oa->userfunc(&osi->os, oa->userarg, cr, tx); } spa_history_internal_log(LOG_DS_CREATE, dd->dd_pool->dp_spa, tx, cr, "dataset = %llu", dsobj); dsl_dataset_rele(ds, FTAG); } int dmu_objset_create(const char *name, dmu_objset_type_t type, objset_t *clone_parent, 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); } dprintf("name=%s\n", name); oa.userfunc = func; oa.userarg = arg; oa.lastname = tail; oa.type = type; oa.flags = flags; if (clone_parent != NULL) { /* * You can't clone to a different type. */ if (clone_parent->os->os_phys->os_type != type) { dsl_dir_close(pdd, FTAG); return (EINVAL); } oa.clone_parent = clone_parent->os->os_dsl_dataset; } 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) { objset_t *os; int error; /* * If it looks like we'll be able to destroy it, and there's * an unplayed replay log sitting around, destroy the log. * It would be nicer to do this in dsl_dataset_destroy_sync(), * but the replay log objset is modified in open context. */ error = dmu_objset_open(name, DMU_OST_ANY, DS_MODE_OWNER|DS_MODE_READONLY|DS_MODE_INCONSISTENT, &os); if (error == 0) { dsl_dataset_t *ds = os->os->os_dsl_dataset; zil_destroy(dmu_objset_zil(os), B_FALSE); error = dsl_dataset_destroy(ds, os); /* * dsl_dataset_destroy() closes the ds. */ kmem_free(os, sizeof (objset_t)); } return (error); } /* * This will close the objset. */ int dmu_objset_rollback(objset_t *os) { int err; dsl_dataset_t *ds; ds = os->os->os_dsl_dataset; if (!dsl_dataset_tryown(ds, TRUE, os)) { dmu_objset_close(os); return (EBUSY); } err = dsl_dataset_rollback(ds, os->os->os_phys->os_type); /* * NB: we close the objset manually because the rollback * actually implicitly called dmu_objset_evict(), thus freeing * the objset_impl_t. */ dsl_dataset_disown(ds, os); kmem_free(os, sizeof (objset_t)); return (err); } struct snaparg { dsl_sync_task_group_t *dstg; char *snapname; char failed[MAXPATHLEN]; boolean_t checkperms; 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->os_dsl_dataset, sn->snapname, tx)); } static void snapshot_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) { objset_t *os = arg1; dsl_dataset_t *ds = os->os->os_dsl_dataset; struct snaparg *sn = arg2; dsl_dataset_snapshot_sync(ds, sn->snapname, cr, tx); if (sn->props) dsl_props_set_sync(ds->ds_prev, sn->props, cr, tx); } static int dmu_objset_snapshot_one(char *name, void *arg) { struct snaparg *sn = arg; objset_t *os; int err; (void) strcpy(sn->failed, name); /* * Check permissions only when requested. This only applies when * doing a recursive snapshot. The permission checks for the starting * dataset have already been performed in zfs_secpolicy_snapshot() */ if (sn->checkperms == B_TRUE && (err = zfs_secpolicy_snapshot_perms(name, CRED()))) return (err); err = dmu_objset_open(name, DMU_OST_ANY, DS_MODE_USER, &os); if (err != 0) return (err); /* If the objset is in an inconsistent state, return busy */ if (os->os->os_dsl_dataset->ds_phys->ds_flags & DS_FLAG_INCONSISTENT) { dmu_objset_close(os); return (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_close(os); } 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; if (recursive) { sn.checkperms = B_TRUE; err = dmu_objset_find(fsname, dmu_objset_snapshot_one, &sn, DS_FIND_CHILDREN); } else { sn.checkperms = B_FALSE; 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->os_dsl_dataset; if (dst->dst_err) dsl_dataset_name(ds, sn.failed); zil_resume(dmu_objset_zil(os)); dmu_objset_close(os); } 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, 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() * to accomodate meta-dnode */ 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); dnode_sync(dn, tx); } } /* ARGSUSED */ static void ready(zio_t *zio, arc_buf_t *abuf, void *arg) { blkptr_t *bp = zio->io_bp; blkptr_t *bp_orig = &zio->io_bp_orig; objset_impl_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. */ bp->blk_fill = 1; /* count the meta-dnode */ for (int i = 0; i < dnp->dn_nblkptr; i++) bp->blk_fill += dnp->dn_blkptr[i].blk_fill; if (zio->io_flags & ZIO_FLAG_IO_REWRITE) { ASSERT(DVA_EQUAL(BP_IDENTITY(bp), BP_IDENTITY(bp_orig))); } else { if (zio->io_bp_orig.blk_birth == os->os_synctx->tx_txg) (void) dsl_dataset_block_kill(os->os_dsl_dataset, &zio->io_bp_orig, zio, os->os_synctx); dsl_dataset_block_born(os->os_dsl_dataset, bp, os->os_synctx); } } /* called from dsl */ void dmu_objset_sync(objset_impl_t *os, zio_t *pio, dmu_tx_t *tx) { int txgoff; zbookmark_t zb; writeprops_t wp = { 0 }; zio_t *zio; list_t *list; 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 */ zb.zb_objset = os->os_dsl_dataset ? os->os_dsl_dataset->ds_object : 0; zb.zb_object = 0; zb.zb_level = -1; /* for block ordering; it's level 0 on disk */ zb.zb_blkid = 0; wp.wp_type = DMU_OT_OBJSET; wp.wp_level = 0; /* on-disk BP level; see above */ wp.wp_copies = os->os_copies; wp.wp_oschecksum = os->os_checksum; wp.wp_oscompress = os->os_compress; if (BP_IS_OLDER(os->os_rootbp, tx->tx_txg)) { (void) dsl_dataset_block_kill(os->os_dsl_dataset, os->os_rootbp, pio, tx); } arc_release(os->os_phys_buf, &os->os_phys_buf); zio = arc_write(pio, os->os_spa, &wp, DMU_OS_IS_L2CACHEABLE(os), tx->tx_txg, os->os_rootbp, os->os_phys_buf, ready, NULL, os, ZIO_PRIORITY_ASYNC_WRITE, ZIO_FLAG_MUSTSUCCEED, &zb); /* * Sync meta-dnode - the parent IO for the sync is the root block */ os->os_meta_dnode->dn_zio = zio; dnode_sync(os->os_meta_dnode, tx); txgoff = tx->tx_txg & TXG_MASK; dmu_objset_sync_dnodes(&os->os_free_dnodes[txgoff], tx); dmu_objset_sync_dnodes(&os->os_dirty_dnodes[txgoff], tx); list = &os->os_meta_dnode->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); } void dmu_objset_space(objset_t *os, uint64_t *refdbytesp, uint64_t *availbytesp, uint64_t *usedobjsp, uint64_t *availobjsp) { dsl_dataset_space(os->os->os_dsl_dataset, refdbytesp, availbytesp, usedobjsp, availobjsp); } uint64_t dmu_objset_fsid_guid(objset_t *os) { return (dsl_dataset_fsid_guid(os->os->os_dsl_dataset)); } void dmu_objset_fast_stat(objset_t *os, dmu_objset_stats_t *stat) { stat->dds_type = os->os->os_phys->os_type; if (os->os->os_dsl_dataset) dsl_dataset_fast_stat(os->os->os_dsl_dataset, stat); } void dmu_objset_stats(objset_t *os, nvlist_t *nv) { ASSERT(os->os->os_dsl_dataset || os->os->os_phys->os_type == DMU_OST_META); if (os->os->os_dsl_dataset != NULL) dsl_dataset_stats(os->os->os_dsl_dataset, nv); dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_TYPE, os->os->os_phys->os_type); } int dmu_objset_is_snapshot(objset_t *os) { if (os->os->os_dsl_dataset != NULL) return (dsl_dataset_is_snapshot(os->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->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->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->os_dsl_dataset->ds_dir; zap_cursor_t cursor; zap_attribute_t attr; /* there is no next dir on a snapshot! */ if (os->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)(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((char *)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(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_alloc(MAXPATHLEN, KM_SLEEP); (void) strcpy(child, name); (void) strcat(child, "/"); (void) strcat(child, attr->za_name); err = dmu_objset_find_spa(spa, child, func, arg, flags); kmem_free(child, MAXPATHLEN); 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_alloc(MAXPATHLEN, KM_SLEEP); (void) strcpy(child, name); (void) strcat(child, "@"); (void) strcat(child, attr->za_name); err = func(spa, attr->za_first_integer, child, arg); kmem_free(child, MAXPATHLEN); 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(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 (!dsl_dataset_get_user_ptr(ds)) { uint32_t aflags = ARC_NOWAIT | ARC_PREFETCH; zbookmark_t zb; zb.zb_objset = ds->ds_object; zb.zb_object = 0; zb.zb_level = -1; zb.zb_blkid = 0; (void) arc_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->os_user_ptr_lock)); os->os->os_user_ptr = user_ptr; } void * dmu_objset_get_user(objset_t *os) { ASSERT(MUTEX_HELD(&os->os->os_user_ptr_lock)); return (os->os->os_user_ptr); }