/*
 * 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 2006 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#ifndef	_SYS_DMU_OBJSET_H
#define	_SYS_DMU_OBJSET_H

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

#include <sys/spa.h>
#include <sys/txg.h>
#include <sys/zfs_context.h>
#include <sys/dnode.h>
#include <sys/zio.h>
#include <sys/zil.h>

#ifdef	__cplusplus
extern "C" {
#endif

struct dsl_dataset;
struct dmu_tx;
struct objset_impl;

typedef struct objset_phys {
	dnode_phys_t os_meta_dnode;
	zil_header_t os_zil_header;
	uint64_t os_type;
	char os_pad[1024 - sizeof (dnode_phys_t) - sizeof (zil_header_t) -
	    sizeof (uint64_t)];
} objset_phys_t;

struct objset {
	struct objset_impl *os;
	int os_mode;
};

typedef struct objset_impl {
	/* Immutable: */
	struct dsl_dataset *os_dsl_dataset;
	spa_t *os_spa;
	objset_phys_t *os_phys;
	dnode_t *os_meta_dnode;
	zilog_t *os_zil;
	objset_t os;
	uint8_t os_checksum;	/* can change, under dsl_dir's locks */
	uint8_t os_compress;	/* can change, under dsl_dir's locks */
	uint8_t os_md_checksum;
	uint8_t os_md_compress;

	/* no lock needed: */
	struct dmu_tx *os_synctx; /* XXX sketchy */
	blkptr_t os_rootbp;

	/* Protected by os_obj_lock */
	kmutex_t os_obj_lock;
	uint64_t os_obj_next;

	/* Protected by os_lock */
	kmutex_t os_lock;
	list_t os_dirty_dnodes[TXG_SIZE];
	list_t os_free_dnodes[TXG_SIZE];
	list_t os_dnodes;
	list_t os_downgraded_dbufs;
} objset_impl_t;

#define	DMU_META_DNODE_OBJECT	0

/* called from zpl */
int dmu_objset_open(const char *name, dmu_objset_type_t type, int mode,
    objset_t **osp);
void dmu_objset_close(objset_t *os);
int dmu_objset_create(const char *name, dmu_objset_type_t type,
    objset_t *clone_parent,
    void (*func)(objset_t *os, void *arg, dmu_tx_t *tx), void *arg);
int dmu_objset_destroy(const char *name);
int dmu_objset_rollback(const char *name);
int dmu_objset_snapshot(char *fsname, char *snapname, boolean_t recursive);
void dmu_objset_stats(objset_t *os, dmu_objset_stats_t *dds);
int dmu_objset_find(char *name, int func(char *, void *), void *arg,
    int flags);
void dmu_objset_byteswap(void *buf, size_t size);
int dmu_objset_evict_dbufs(objset_t *os, int try);

/* called from dsl */
void dmu_objset_sync(objset_impl_t *os, dmu_tx_t *tx);
objset_impl_t *dmu_objset_create_impl(spa_t *spa, struct dsl_dataset *ds,
    dmu_objset_type_t type, dmu_tx_t *tx);
int dmu_objset_open_impl(spa_t *spa, struct dsl_dataset *ds, blkptr_t *bp,
    objset_impl_t **osip);
void dmu_objset_evict(struct dsl_dataset *ds, void *arg);

#ifdef	__cplusplus
}
#endif

#endif /* _SYS_DMU_OBJSET_H */