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      1 /*
      2  * CDDL HEADER START
      3  *
      4  * The contents of this file are subject to the terms of the
      5  * Common Development and Distribution License (the "License").
      6  * You may not use this file except in compliance with the License.
      7  *
      8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
      9  * or http://www.opensolaris.org/os/licensing.
     10  * See the License for the specific language governing permissions
     11  * and limitations under the License.
     12  *
     13  * When distributing Covered Code, include this CDDL HEADER in each
     14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     15  * If applicable, add the following below this CDDL HEADER, with the
     16  * fields enclosed by brackets "[]" replaced with your own identifying
     17  * information: Portions Copyright [yyyy] [name of copyright owner]
     18  *
     19  * CDDL HEADER END
     20  */
     21 /*
     22  * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
     23  * Use is subject to license terms.
     24  */
     25 
     26 #pragma ident	"@(#)dsl_pool.c	1.11	07/12/07 SMI"
     27 
     28 #include <sys/dsl_pool.h>
     29 #include <sys/dsl_dataset.h>
     30 #include <sys/dsl_dir.h>
     31 #include <sys/dsl_synctask.h>
     32 #include <sys/dmu_tx.h>
     33 #include <sys/dmu_objset.h>
     34 #include <sys/arc.h>
     35 #include <sys/zap.h>
     36 #include <sys/zio.h>
     37 #include <sys/zfs_context.h>
     38 #include <sys/fs/zfs.h>
     39 
     40 static int
     41 dsl_pool_open_mos_dir(dsl_pool_t *dp, dsl_dir_t **ddp)
     42 {
     43 	uint64_t obj;
     44 	int err;
     45 
     46 	err = zap_lookup(dp->dp_meta_objset,
     47 	    dp->dp_root_dir->dd_phys->dd_child_dir_zapobj,
     48 	    MOS_DIR_NAME, sizeof (obj), 1, &obj);
     49 	if (err)
     50 		return (err);
     51 
     52 	return (dsl_dir_open_obj(dp, obj, MOS_DIR_NAME, dp, ddp));
     53 }
     54 
     55 static dsl_pool_t *
     56 dsl_pool_open_impl(spa_t *spa, uint64_t txg)
     57 {
     58 	dsl_pool_t *dp;
     59 	blkptr_t *bp = spa_get_rootblkptr(spa);
     60 
     61 	dp = kmem_zalloc(sizeof (dsl_pool_t), KM_SLEEP);
     62 	dp->dp_spa = spa;
     63 	dp->dp_meta_rootbp = *bp;
     64 	rw_init(&dp->dp_config_rwlock, NULL, RW_DEFAULT, NULL);
     65 	txg_init(dp, txg);
     66 
     67 	txg_list_create(&dp->dp_dirty_datasets,
     68 	    offsetof(dsl_dataset_t, ds_dirty_link));
     69 	txg_list_create(&dp->dp_dirty_dirs,
     70 	    offsetof(dsl_dir_t, dd_dirty_link));
     71 	txg_list_create(&dp->dp_sync_tasks,
     72 	    offsetof(dsl_sync_task_group_t, dstg_node));
     73 	list_create(&dp->dp_synced_datasets, sizeof (dsl_dataset_t),
     74 	    offsetof(dsl_dataset_t, ds_synced_link));
     75 
     76 	return (dp);
     77 }
     78 
     79 int
     80 dsl_pool_open(spa_t *spa, uint64_t txg, dsl_pool_t **dpp)
     81 {
     82 	int err;
     83 	dsl_pool_t *dp = dsl_pool_open_impl(spa, txg);
     84 	objset_impl_t *osi;
     85 
     86 	rw_enter(&dp->dp_config_rwlock, RW_READER);
     87 	err = dmu_objset_open_impl(spa, NULL, &dp->dp_meta_rootbp, &osi);
     88 	if (err)
     89 		goto out;
     90 	dp->dp_meta_objset = &osi->os;
     91 
     92 	err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT,
     93 	    DMU_POOL_ROOT_DATASET, sizeof (uint64_t), 1,
     94 	    &dp->dp_root_dir_obj);
     95 	if (err)
     96 		goto out;
     97 
     98 	err = dsl_dir_open_obj(dp, dp->dp_root_dir_obj,
     99 	    NULL, dp, &dp->dp_root_dir);
    100 	if (err)
    101 		goto out;
    102 
    103 	err = dsl_pool_open_mos_dir(dp, &dp->dp_mos_dir);
    104 	if (err)
    105 		goto out;
    106 
    107 out:
    108 	rw_exit(&dp->dp_config_rwlock);
    109 	if (err)
    110 		dsl_pool_close(dp);
    111 	else
    112 		*dpp = dp;
    113 
    114 	return (err);
    115 }
    116 
    117 void
    118 dsl_pool_close(dsl_pool_t *dp)
    119 {
    120 	/* drop our reference from dsl_pool_open() */
    121 	if (dp->dp_mos_dir)
    122 		dsl_dir_close(dp->dp_mos_dir, dp);
    123 	if (dp->dp_root_dir)
    124 		dsl_dir_close(dp->dp_root_dir, dp);
    125 
    126 	/* undo the dmu_objset_open_impl(mos) from dsl_pool_open() */
    127 	if (dp->dp_meta_objset)
    128 		dmu_objset_evict(NULL, dp->dp_meta_objset->os);
    129 
    130 	txg_list_destroy(&dp->dp_dirty_datasets);
    131 	txg_list_destroy(&dp->dp_dirty_dirs);
    132 	list_destroy(&dp->dp_synced_datasets);
    133 
    134 	arc_flush(dp->dp_spa);
    135 	txg_fini(dp);
    136 	rw_destroy(&dp->dp_config_rwlock);
    137 	kmem_free(dp, sizeof (dsl_pool_t));
    138 }
    139 
    140 dsl_pool_t *
    141 dsl_pool_create(spa_t *spa, uint64_t txg)
    142 {
    143 	int err;
    144 	dsl_pool_t *dp = dsl_pool_open_impl(spa, txg);
    145 	dmu_tx_t *tx = dmu_tx_create_assigned(dp, txg);
    146 	dp->dp_meta_objset = &dmu_objset_create_impl(spa,
    147 	    NULL, &dp->dp_meta_rootbp, DMU_OST_META, tx)->os;
    148 
    149 	/* create the pool directory */
    150 	err = zap_create_claim(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT,
    151 	    DMU_OT_OBJECT_DIRECTORY, DMU_OT_NONE, 0, tx);
    152 	ASSERT3U(err, ==, 0);
    153 
    154 	/* create and open the root dir */
    155 	dsl_dataset_create_root(dp, &dp->dp_root_dir_obj, tx);
    156 	VERIFY(0 == dsl_dir_open_obj(dp, dp->dp_root_dir_obj,
    157 	    NULL, dp, &dp->dp_root_dir));
    158 
    159 	/* create and open the meta-objset dir */
    160 	(void) dsl_dir_create_sync(dp->dp_root_dir, MOS_DIR_NAME, tx);
    161 	VERIFY(0 == dsl_pool_open_mos_dir(dp, &dp->dp_mos_dir));
    162 
    163 	dmu_tx_commit(tx);
    164 
    165 	return (dp);
    166 }
    167 
    168 void
    169 dsl_pool_sync(dsl_pool_t *dp, uint64_t txg)
    170 {
    171 	zio_t *zio;
    172 	dmu_tx_t *tx;
    173 	dsl_dir_t *dd;
    174 	dsl_dataset_t *ds;
    175 	dsl_sync_task_group_t *dstg;
    176 	objset_impl_t *mosi = dp->dp_meta_objset->os;
    177 	int err;
    178 
    179 	tx = dmu_tx_create_assigned(dp, txg);
    180 
    181 	zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED);
    182 	while (ds = txg_list_remove(&dp->dp_dirty_datasets, txg)) {
    183 		if (!list_link_active(&ds->ds_synced_link))
    184 			list_insert_tail(&dp->dp_synced_datasets, ds);
    185 		else
    186 			dmu_buf_rele(ds->ds_dbuf, ds);
    187 		dsl_dataset_sync(ds, zio, tx);
    188 	}
    189 	err = zio_wait(zio);
    190 	ASSERT(err == 0);
    191 
    192 	while (dstg = txg_list_remove(&dp->dp_sync_tasks, txg))
    193 		dsl_sync_task_group_sync(dstg, tx);
    194 	while (dd = txg_list_remove(&dp->dp_dirty_dirs, txg))
    195 		dsl_dir_sync(dd, tx);
    196 
    197 	if (list_head(&mosi->os_dirty_dnodes[txg & TXG_MASK]) != NULL ||
    198 	    list_head(&mosi->os_free_dnodes[txg & TXG_MASK]) != NULL) {
    199 		zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED);
    200 		dmu_objset_sync(mosi, zio, tx);
    201 		err = zio_wait(zio);
    202 		ASSERT(err == 0);
    203 		dprintf_bp(&dp->dp_meta_rootbp, "meta objset rootbp is %s", "");
    204 		spa_set_rootblkptr(dp->dp_spa, &dp->dp_meta_rootbp);
    205 	}
    206 
    207 	dmu_tx_commit(tx);
    208 }
    209 
    210 void
    211 dsl_pool_zil_clean(dsl_pool_t *dp)
    212 {
    213 	dsl_dataset_t *ds;
    214 
    215 	while (ds = list_head(&dp->dp_synced_datasets)) {
    216 		list_remove(&dp->dp_synced_datasets, ds);
    217 		ASSERT(ds->ds_user_ptr != NULL);
    218 		zil_clean(((objset_impl_t *)ds->ds_user_ptr)->os_zil);
    219 		dmu_buf_rele(ds->ds_dbuf, ds);
    220 	}
    221 }
    222 
    223 /*
    224  * TRUE if the current thread is the tx_sync_thread or if we
    225  * are being called from SPA context during pool initialization.
    226  */
    227 int
    228 dsl_pool_sync_context(dsl_pool_t *dp)
    229 {
    230 	return (curthread == dp->dp_tx.tx_sync_thread ||
    231 	    spa_get_dsl(dp->dp_spa) == NULL);
    232 }
    233 
    234 uint64_t
    235 dsl_pool_adjustedsize(dsl_pool_t *dp, boolean_t netfree)
    236 {
    237 	uint64_t space, resv;
    238 
    239 	/*
    240 	 * Reserve about 1.6% (1/64), or at least 32MB, for allocation
    241 	 * efficiency.
    242 	 * XXX The intent log is not accounted for, so it must fit
    243 	 * within this slop.
    244 	 *
    245 	 * If we're trying to assess whether it's OK to do a free,
    246 	 * cut the reservation in half to allow forward progress
    247 	 * (e.g. make it possible to rm(1) files from a full pool).
    248 	 */
    249 	space = spa_get_dspace(dp->dp_spa);
    250 	resv = MAX(space >> 6, SPA_MINDEVSIZE >> 1);
    251 	if (netfree)
    252 		resv >>= 1;
    253 
    254 	return (space - resv);
    255 }
    256