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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 #ifndef	_SYS_DMU_TX_H
     27 #define	_SYS_DMU_TX_H
     28 
     29 #pragma ident	"@(#)dmu_tx.h	1.6	07/10/29 SMI"
     30 
     31 #include <sys/inttypes.h>
     32 #include <sys/dmu.h>
     33 #include <sys/txg.h>
     34 #include <sys/refcount.h>
     35 
     36 #ifdef	__cplusplus
     37 extern "C" {
     38 #endif
     39 
     40 struct dmu_buf_impl;
     41 struct dmu_tx_hold;
     42 struct dnode_link;
     43 struct dsl_pool;
     44 struct dnode;
     45 struct dsl_dir;
     46 
     47 struct dmu_tx {
     48 	/*
     49 	 * No synchronization is needed because a tx can only be handled
     50 	 * by one thread.
     51 	 */
     52 	list_t tx_holds; /* list of dmu_tx_hold_t */
     53 	objset_t *tx_objset;
     54 	struct dsl_dir *tx_dir;
     55 	struct dsl_pool *tx_pool;
     56 	uint64_t tx_txg;
     57 	uint64_t tx_lastsnap_txg;
     58 	uint64_t tx_lasttried_txg;
     59 	txg_handle_t tx_txgh;
     60 	void *tx_tempreserve_cookie;
     61 	struct dmu_tx_hold *tx_needassign_txh;
     62 	uint8_t tx_anyobj;
     63 	int tx_err;
     64 #ifdef ZFS_DEBUG
     65 	uint64_t tx_space_towrite;
     66 	uint64_t tx_space_tofree;
     67 	uint64_t tx_space_tooverwrite;
     68 	uint64_t tx_space_tounref;
     69 	refcount_t tx_space_written;
     70 	refcount_t tx_space_freed;
     71 #endif
     72 };
     73 
     74 enum dmu_tx_hold_type {
     75 	THT_NEWOBJECT,
     76 	THT_WRITE,
     77 	THT_BONUS,
     78 	THT_FREE,
     79 	THT_ZAP,
     80 	THT_SPACE,
     81 	THT_NUMTYPES
     82 };
     83 
     84 typedef struct dmu_tx_hold {
     85 	dmu_tx_t *txh_tx;
     86 	list_node_t txh_node;
     87 	struct dnode *txh_dnode;
     88 	uint64_t txh_space_towrite;
     89 	uint64_t txh_space_tofree;
     90 	uint64_t txh_space_tooverwrite;
     91 	uint64_t txh_space_tounref;
     92 #ifdef ZFS_DEBUG
     93 	enum dmu_tx_hold_type txh_type;
     94 	uint64_t txh_arg1;
     95 	uint64_t txh_arg2;
     96 #endif
     97 } dmu_tx_hold_t;
     98 
     99 
    100 /*
    101  * These routines are defined in dmu.h, and are called by the user.
    102  */
    103 dmu_tx_t *dmu_tx_create(objset_t *dd);
    104 int dmu_tx_assign(dmu_tx_t *tx, uint64_t txg_how);
    105 void dmu_tx_commit(dmu_tx_t *tx);
    106 void dmu_tx_abort(dmu_tx_t *tx);
    107 uint64_t dmu_tx_get_txg(dmu_tx_t *tx);
    108 void dmu_tx_wait(dmu_tx_t *tx);
    109 
    110 /*
    111  * These routines are defined in dmu_spa.h, and are called by the SPA.
    112  */
    113 extern dmu_tx_t *dmu_tx_create_assigned(struct dsl_pool *dp, uint64_t txg);
    114 
    115 /*
    116  * These routines are only called by the DMU.
    117  */
    118 dmu_tx_t *dmu_tx_create_dd(dsl_dir_t *dd);
    119 int dmu_tx_is_syncing(dmu_tx_t *tx);
    120 int dmu_tx_private_ok(dmu_tx_t *tx);
    121 void dmu_tx_add_new_object(dmu_tx_t *tx, objset_t *os, uint64_t object);
    122 void dmu_tx_willuse_space(dmu_tx_t *tx, int64_t delta);
    123 void dmu_tx_dirty_buf(dmu_tx_t *tx, struct dmu_buf_impl *db);
    124 int dmu_tx_holds(dmu_tx_t *tx, uint64_t object);
    125 void dmu_tx_hold_space(dmu_tx_t *tx, uint64_t space);
    126 
    127 #ifdef ZFS_DEBUG
    128 #define	DMU_TX_DIRTY_BUF(tx, db)	dmu_tx_dirty_buf(tx, db)
    129 #else
    130 #define	DMU_TX_DIRTY_BUF(tx, db)
    131 #endif
    132 
    133 #ifdef	__cplusplus
    134 }
    135 #endif
    136 
    137 #endif	/* _SYS_DMU_TX_H */
    138