diff options
Diffstat (limited to 'sys/contrib/opensolaris/uts/common/fs/zfs/dsl_pool.c')
-rw-r--r-- | sys/contrib/opensolaris/uts/common/fs/zfs/dsl_pool.c | 256 |
1 files changed, 256 insertions, 0 deletions
diff --git a/sys/contrib/opensolaris/uts/common/fs/zfs/dsl_pool.c b/sys/contrib/opensolaris/uts/common/fs/zfs/dsl_pool.c new file mode 100644 index 0000000..00abf7e --- /dev/null +++ b/sys/contrib/opensolaris/uts/common/fs/zfs/dsl_pool.c @@ -0,0 +1,256 @@ +/* + * 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 2007 Sun Microsystems, Inc. All rights reserved. + * Use is subject to license terms. + */ + +#pragma ident "%Z%%M% %I% %E% SMI" + +#include <sys/dsl_pool.h> +#include <sys/dsl_dataset.h> +#include <sys/dsl_dir.h> +#include <sys/dsl_synctask.h> +#include <sys/dmu_tx.h> +#include <sys/dmu_objset.h> +#include <sys/arc.h> +#include <sys/zap.h> +#include <sys/zio.h> +#include <sys/zfs_context.h> +#include <sys/fs/zfs.h> + +static int +dsl_pool_open_mos_dir(dsl_pool_t *dp, dsl_dir_t **ddp) +{ + uint64_t obj; + int err; + + err = zap_lookup(dp->dp_meta_objset, + dp->dp_root_dir->dd_phys->dd_child_dir_zapobj, + MOS_DIR_NAME, sizeof (obj), 1, &obj); + if (err) + return (err); + + return (dsl_dir_open_obj(dp, obj, MOS_DIR_NAME, dp, ddp)); +} + +static dsl_pool_t * +dsl_pool_open_impl(spa_t *spa, uint64_t txg) +{ + dsl_pool_t *dp; + blkptr_t *bp = spa_get_rootblkptr(spa); + + dp = kmem_zalloc(sizeof (dsl_pool_t), KM_SLEEP); + dp->dp_spa = spa; + dp->dp_meta_rootbp = *bp; + rw_init(&dp->dp_config_rwlock, NULL, RW_DEFAULT, NULL); + txg_init(dp, txg); + + txg_list_create(&dp->dp_dirty_datasets, + offsetof(dsl_dataset_t, ds_dirty_link)); + txg_list_create(&dp->dp_dirty_dirs, + offsetof(dsl_dir_t, dd_dirty_link)); + txg_list_create(&dp->dp_sync_tasks, + offsetof(dsl_sync_task_group_t, dstg_node)); + list_create(&dp->dp_synced_objsets, sizeof (dsl_dataset_t), + offsetof(dsl_dataset_t, ds_synced_link)); + + return (dp); +} + +int +dsl_pool_open(spa_t *spa, uint64_t txg, dsl_pool_t **dpp) +{ + int err; + dsl_pool_t *dp = dsl_pool_open_impl(spa, txg); + objset_impl_t *osi; + + rw_enter(&dp->dp_config_rwlock, RW_READER); + err = dmu_objset_open_impl(spa, NULL, &dp->dp_meta_rootbp, &osi); + if (err) + goto out; + dp->dp_meta_objset = &osi->os; + + err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, + DMU_POOL_ROOT_DATASET, sizeof (uint64_t), 1, + &dp->dp_root_dir_obj); + if (err) + goto out; + + err = dsl_dir_open_obj(dp, dp->dp_root_dir_obj, + NULL, dp, &dp->dp_root_dir); + if (err) + goto out; + + err = dsl_pool_open_mos_dir(dp, &dp->dp_mos_dir); + if (err) + goto out; + +out: + rw_exit(&dp->dp_config_rwlock); + if (err) + dsl_pool_close(dp); + else + *dpp = dp; + + return (err); +} + +void +dsl_pool_close(dsl_pool_t *dp) +{ + /* drop our reference from dsl_pool_open() */ + if (dp->dp_mos_dir) + dsl_dir_close(dp->dp_mos_dir, dp); + if (dp->dp_root_dir) + dsl_dir_close(dp->dp_root_dir, dp); + + /* undo the dmu_objset_open_impl(mos) from dsl_pool_open() */ + if (dp->dp_meta_objset) + dmu_objset_evict(NULL, dp->dp_meta_objset->os); + + txg_list_destroy(&dp->dp_dirty_datasets); + txg_list_destroy(&dp->dp_dirty_dirs); + txg_list_destroy(&dp->dp_sync_tasks); + list_destroy(&dp->dp_synced_objsets); + + arc_flush(); + txg_fini(dp); + rw_destroy(&dp->dp_config_rwlock); + kmem_free(dp, sizeof (dsl_pool_t)); +} + +dsl_pool_t * +dsl_pool_create(spa_t *spa, uint64_t txg) +{ + int err; + dsl_pool_t *dp = dsl_pool_open_impl(spa, txg); + dmu_tx_t *tx = dmu_tx_create_assigned(dp, txg); + dp->dp_meta_objset = &dmu_objset_create_impl(spa, + NULL, &dp->dp_meta_rootbp, DMU_OST_META, tx)->os; + + /* create the pool directory */ + err = zap_create_claim(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, + DMU_OT_OBJECT_DIRECTORY, DMU_OT_NONE, 0, tx); + ASSERT3U(err, ==, 0); + + /* create and open the root dir */ + dsl_dataset_create_root(dp, &dp->dp_root_dir_obj, tx); + VERIFY(0 == dsl_dir_open_obj(dp, dp->dp_root_dir_obj, + NULL, dp, &dp->dp_root_dir)); + + /* create and open the meta-objset dir */ + (void) dsl_dir_create_sync(dp->dp_root_dir, MOS_DIR_NAME, tx); + VERIFY(0 == dsl_pool_open_mos_dir(dp, &dp->dp_mos_dir)); + + dmu_tx_commit(tx); + + return (dp); +} + +void +dsl_pool_sync(dsl_pool_t *dp, uint64_t txg) +{ + zio_t *zio; + dmu_tx_t *tx; + dsl_dir_t *dd; + dsl_dataset_t *ds; + dsl_sync_task_group_t *dstg; + objset_impl_t *mosi = dp->dp_meta_objset->os; + int err; + + tx = dmu_tx_create_assigned(dp, txg); + + zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED); + while (ds = txg_list_remove(&dp->dp_dirty_datasets, txg)) { + if (!list_link_active(&ds->ds_synced_link)) + list_insert_tail(&dp->dp_synced_objsets, ds); + else + dmu_buf_rele(ds->ds_dbuf, ds); + dsl_dataset_sync(ds, zio, tx); + } + err = zio_wait(zio); + ASSERT(err == 0); + + while (dstg = txg_list_remove(&dp->dp_sync_tasks, txg)) + dsl_sync_task_group_sync(dstg, tx); + while (dd = txg_list_remove(&dp->dp_dirty_dirs, txg)) + dsl_dir_sync(dd, tx); + + if (list_head(&mosi->os_dirty_dnodes[txg & TXG_MASK]) != NULL || + list_head(&mosi->os_free_dnodes[txg & TXG_MASK]) != NULL) { + zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED); + dmu_objset_sync(mosi, zio, tx); + err = zio_wait(zio); + ASSERT(err == 0); + dprintf_bp(&dp->dp_meta_rootbp, "meta objset rootbp is %s", ""); + spa_set_rootblkptr(dp->dp_spa, &dp->dp_meta_rootbp); + } + + dmu_tx_commit(tx); +} + +void +dsl_pool_zil_clean(dsl_pool_t *dp) +{ + dsl_dataset_t *ds; + + while (ds = list_head(&dp->dp_synced_objsets)) { + list_remove(&dp->dp_synced_objsets, ds); + ASSERT(ds->ds_user_ptr != NULL); + zil_clean(((objset_impl_t *)ds->ds_user_ptr)->os_zil); + dmu_buf_rele(ds->ds_dbuf, ds); + } +} + +/* + * TRUE if the current thread is the tx_sync_thread or if we + * are being called from SPA context during pool initialization. + */ +int +dsl_pool_sync_context(dsl_pool_t *dp) +{ + return (curthread == dp->dp_tx.tx_sync_thread || + spa_get_dsl(dp->dp_spa) == NULL); +} + +uint64_t +dsl_pool_adjustedsize(dsl_pool_t *dp, boolean_t netfree) +{ + uint64_t space, resv; + + /* + * Reserve about 1.6% (1/64), or at least 32MB, for allocation + * efficiency. + * XXX The intent log is not accounted for, so it must fit + * within this slop. + * + * If we're trying to assess whether it's OK to do a free, + * cut the reservation in half to allow forward progress + * (e.g. make it possible to rm(1) files from a full pool). + */ + space = spa_get_dspace(dp->dp_spa); + resv = MAX(space >> 6, SPA_MINDEVSIZE >> 1); + if (netfree) + resv >>= 1; + + return (space - resv); +} |