/*

 * 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_TX_H

#define	_SYS_DMU_TX_H

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

#include <sys/inttypes.h>

#include <sys/dmu.h>

#include <sys/txg.h>

#include <sys/refcount.h>

#ifdef	__cplusplus

extern "C" {

#endif

struct dmu_buf_impl;

struct dmu_tx_hold;

struct dnode_link;

struct dsl_pool;

struct dnode;

struct dsl_dir;

struct dmu_tx {

	/*

	 * No synchronization is needed because a tx can only be handled

	 * by one thread.

	 */

	list_t tx_holds; /* list of dmu_tx_hold_t */

	objset_t *tx_objset;

	struct dsl_dir *tx_dir;

	struct dsl_pool *tx_pool;

	uint64_t tx_txg;

	uint64_t tx_lastsnap_txg;

	uint64_t tx_lasttried_txg;

	txg_handle_t tx_txgh;

	void *tx_tempreserve_cookie;

	struct dmu_tx_hold *tx_needassign_txh;

	uint8_t tx_anyobj;

	int tx_err;

#ifdef ZFS_DEBUG

	uint64_t tx_space_towrite;

	uint64_t tx_space_tofree;

	uint64_t tx_space_tooverwrite;

	refcount_t tx_space_written;

	refcount_t tx_space_freed;

#endif

};

enum dmu_tx_hold_type {

	THT_NEWOBJECT,

	THT_WRITE,

	THT_BONUS,

	THT_FREE,

	THT_ZAP,

	THT_SPACE,

	THT_NUMTYPES

};

typedef struct dmu_tx_hold {

	dmu_tx_t *txh_tx;

	list_node_t txh_node;

	struct dnode *txh_dnode;

	uint64_t txh_space_towrite;

	uint64_t txh_space_tofree;

	uint64_t txh_space_tooverwrite;

#ifdef ZFS_DEBUG

	enum dmu_tx_hold_type txh_type;

	uint64_t txh_arg1;

	uint64_t txh_arg2;

#endif

} dmu_tx_hold_t;

/*

 * These routines are defined in dmu.h, and are called by the user.

 */

dmu_tx_t *dmu_tx_create(objset_t *dd);

int dmu_tx_assign(dmu_tx_t *tx, uint64_t txg_how);

void dmu_tx_commit(dmu_tx_t *tx);

void dmu_tx_abort(dmu_tx_t *tx);

uint64_t dmu_tx_get_txg(dmu_tx_t *tx);

void dmu_tx_wait(dmu_tx_t *tx);

/*

 * These routines are defined in dmu_spa.h, and are called by the SPA.

 */

extern dmu_tx_t *dmu_tx_create_assigned(struct dsl_pool *dp, uint64_t txg);

/*

 * These routines are only called by the DMU.

 */

int dmu_tx_is_syncing(dmu_tx_t *tx);

int dmu_tx_private_ok(dmu_tx_t *tx);

void dmu_tx_add_new_object(dmu_tx_t *tx, objset_t *os, uint64_t object);

void dmu_tx_willuse_space(dmu_tx_t *tx, int64_t delta);

void dmu_tx_dirty_buf(dmu_tx_t *tx, struct dmu_buf_impl *db);

int dmu_tx_holds(dmu_tx_t *tx, uint64_t object);

void dmu_tx_hold_space(dmu_tx_t *tx, uint64_t space);

#ifdef ZFS_DEBUG

#define	DMU_TX_DIRTY_BUF(tx, db)	dmu_tx_dirty_buf(tx, db)

#else

#define	DMU_TX_DIRTY_BUF(tx, db)

#endif

#ifdef	__cplusplus

}

#endif

#endif	/* _SYS_DMU_TX_H */