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.
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.
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]
22 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
26 #pragma ident "%Z%%M% %I% %E% SMI"
29 #include <sys/dmu_tx.h>
30 #include <sys/dsl_pool.h>
31 #include <sys/dsl_dir.h>
32 #include <sys/dsl_synctask.h>
34 #define DST_AVG_BLKSHIFT 14
38 dsl_null_checkfunc(void *arg1, void *arg2, dmu_tx_t *tx)
43 dsl_sync_task_group_t *
44 dsl_sync_task_group_create(dsl_pool_t *dp)
46 dsl_sync_task_group_t *dstg;
48 dstg = kmem_zalloc(sizeof (dsl_sync_task_group_t), KM_SLEEP);
49 list_create(&dstg->dstg_tasks, sizeof (dsl_sync_task_t),
50 offsetof(dsl_sync_task_t, dst_node));
57 dsl_sync_task_create(dsl_sync_task_group_t *dstg,
58 dsl_checkfunc_t *checkfunc, dsl_syncfunc_t *syncfunc,
59 void *arg1, void *arg2, int blocks_modified)
63 if (checkfunc == NULL)
64 checkfunc = dsl_null_checkfunc;
65 dst = kmem_zalloc(sizeof (dsl_sync_task_t), KM_SLEEP);
66 dst->dst_checkfunc = checkfunc;
67 dst->dst_syncfunc = syncfunc;
70 list_insert_tail(&dstg->dstg_tasks, dst);
72 dstg->dstg_space += blocks_modified << DST_AVG_BLKSHIFT;
76 dsl_sync_task_group_wait(dsl_sync_task_group_t *dstg)
83 tx = dmu_tx_create_dd(dstg->dstg_pool->dp_mos_dir);
84 VERIFY(0 == dmu_tx_assign(tx, TXG_WAIT));
86 txg = dmu_tx_get_txg(tx);
88 /* Do a preliminary error check. */
90 rw_enter(&dstg->dstg_pool->dp_config_rwlock, RW_READER);
91 for (dst = list_head(&dstg->dstg_tasks); dst;
92 dst = list_next(&dstg->dstg_tasks, dst)) {
95 * Only check half the time, otherwise, the sync-context
96 * check will almost never fail.
98 if (spa_get_random(2) == 0)
102 dst->dst_checkfunc(dst->dst_arg1, dst->dst_arg2, tx);
104 dstg->dstg_err = dst->dst_err;
106 rw_exit(&dstg->dstg_pool->dp_config_rwlock);
108 if (dstg->dstg_err) {
110 return (dstg->dstg_err);
113 VERIFY(0 == txg_list_add(&dstg->dstg_pool->dp_sync_tasks, dstg, txg));
117 txg_wait_synced(dstg->dstg_pool, txg);
119 if (dstg->dstg_err == EAGAIN)
122 return (dstg->dstg_err);
126 dsl_sync_task_group_destroy(dsl_sync_task_group_t *dstg)
128 dsl_sync_task_t *dst;
130 while (dst = list_head(&dstg->dstg_tasks)) {
131 list_remove(&dstg->dstg_tasks, dst);
132 kmem_free(dst, sizeof (dsl_sync_task_t));
134 kmem_free(dstg, sizeof (dsl_sync_task_group_t));
138 dsl_sync_task_group_sync(dsl_sync_task_group_t *dstg, dmu_tx_t *tx)
140 dsl_sync_task_t *dst;
143 ASSERT3U(dstg->dstg_err, ==, 0);
146 * Check for sufficient space.
148 dstg->dstg_err = dsl_dir_tempreserve_space(dstg->dstg_pool->dp_mos_dir,
149 dstg->dstg_space, dstg->dstg_space * 3, 0, &tr_cookie, tx);
150 /* don't bother trying again */
151 if (dstg->dstg_err == ERESTART)
152 dstg->dstg_err = EAGAIN;
157 * Check for errors by calling checkfuncs.
159 rw_enter(&dstg->dstg_pool->dp_config_rwlock, RW_WRITER);
160 for (dst = list_head(&dstg->dstg_tasks); dst;
161 dst = list_next(&dstg->dstg_tasks, dst)) {
163 dst->dst_checkfunc(dst->dst_arg1, dst->dst_arg2, tx);
165 dstg->dstg_err = dst->dst_err;
168 if (dstg->dstg_err == 0) {
170 * Execute sync tasks.
172 for (dst = list_head(&dstg->dstg_tasks); dst;
173 dst = list_next(&dstg->dstg_tasks, dst)) {
174 dst->dst_syncfunc(dst->dst_arg1, dst->dst_arg2, tx);
177 rw_exit(&dstg->dstg_pool->dp_config_rwlock);
179 dsl_dir_tempreserve_clear(tr_cookie, tx);
183 dsl_sync_task_do(dsl_pool_t *dp,
184 dsl_checkfunc_t *checkfunc, dsl_syncfunc_t *syncfunc,
185 void *arg1, void *arg2, int blocks_modified)
187 dsl_sync_task_group_t *dstg;
190 dstg = dsl_sync_task_group_create(dp);
191 dsl_sync_task_create(dstg, checkfunc, syncfunc,
192 arg1, arg2, blocks_modified);
193 err = dsl_sync_task_group_wait(dstg);
194 dsl_sync_task_group_destroy(dstg);