zfs/sys/dsl_pool.h

	dsl_pool.h revision 1ab7f2ded02e7a1bc3c73516eb27efa79bf2a2ff
/*
 * 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 2008 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#ifndef _SYS_DSL_POOL_H
#define _SYS_DSL_POOL_H

#pragma ident   "%Z%%M% %I% %E% SMI"

#include <sys/spa.h>
#include <sys/txg.h>
#include <sys/txg_impl.h>
#include <sys/zfs_context.h>

#ifdef  __cplusplus
extern "C" {
#endif

struct objset;
struct dsl_dir;

typedef struct dsl_pool {
    /* Immutable */
    spa_t *dp_spa;
    struct objset *dp_meta_objset;
    struct dsl_dir *dp_root_dir;
    struct dsl_dir *dp_mos_dir;
    uint64_t dp_root_dir_obj;

    /* No lock needed - sync context only */
    blkptr_t dp_meta_rootbp;
    list_t dp_synced_datasets;
    uint64_t dp_write_limit;

    /* Uses dp_lock */
    kmutex_t dp_lock;
    uint64_t dp_space_towrite[TXG_SIZE];
    uint64_t dp_tempreserved[TXG_SIZE];

    /* Has its own locking */
    tx_state_t dp_tx;
    txg_list_t dp_dirty_datasets;
    txg_list_t dp_dirty_dirs;
    txg_list_t dp_sync_tasks;

    /*
     * Protects administrative changes (properties, namespace)
     * It is only held for write in syncing context.  Therefore
     * syncing context does not need to ever have it for read, since
     * nobody else could possibly have it for write.
     */
    krwlock_t dp_config_rwlock;
} dsl_pool_t;

int dsl_pool_open(spa_t *spa, uint64_t txg, dsl_pool_t **dpp);
void dsl_pool_close(dsl_pool_t *dp);
dsl_pool_t *dsl_pool_create(spa_t *spa, uint64_t txg);
void dsl_pool_sync(dsl_pool_t *dp, uint64_t txg);
void dsl_pool_zil_clean(dsl_pool_t *dp);
int dsl_pool_sync_context(dsl_pool_t *dp);
uint64_t dsl_pool_adjustedsize(dsl_pool_t *dp, boolean_t netfree);
int dsl_pool_tempreserve_space(dsl_pool_t *dp, uint64_t space, dmu_tx_t *tx);
void dsl_pool_tempreserve_clear(dsl_pool_t *dp, int64_t space, dmu_tx_t *tx);
void dsl_pool_memory_pressure(dsl_pool_t *dp);
void dsl_pool_willuse_space(dsl_pool_t *dp, int64_t space, dmu_tx_t *tx);

#ifdef  __cplusplus
}
#endif

#endif /* _SYS_DSL_POOL_H */