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 2010 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25 /*
  26  * Copyright (c) 2013 by Delphix. All rights reserved.
  27  */
  28 
  29 #ifndef _SYS_DMU_TX_H
  30 #define _SYS_DMU_TX_H
  31 
  32 #include <sys/inttypes.h>
  33 #include <sys/dmu.h>
  34 #include <sys/txg.h>
  35 #include <sys/refcount.h>
  36 
  37 #ifdef  __cplusplus
  38 extern "C" {
  39 #endif
  40 
  41 struct dmu_buf_impl;
  42 struct dmu_tx_hold;
  43 struct dnode_link;
  44 struct dsl_pool;
  45 struct dnode;
  46 struct dsl_dir;
  47 
  48 struct dmu_tx {
  49         /*
  50          * No synchronization is needed because a tx can only be handled
  51          * by one thread.
  52          */
  53         list_t tx_holds; /* list of dmu_tx_hold_t */
  54         objset_t *tx_objset;
  55         struct dsl_dir *tx_dir;
  56         struct dsl_pool *tx_pool;
  57         uint64_t tx_txg;
  58         uint64_t tx_lastsnap_txg;
  59         uint64_t tx_lasttried_txg;
  60         txg_handle_t tx_txgh;
  61         void *tx_tempreserve_cookie;
  62         struct dmu_tx_hold *tx_needassign_txh;
  63 
  64         /* list of dmu_tx_callback_t on this dmu_tx */
  65         list_t tx_callbacks;
  66 
  67         /* placeholder for syncing context, doesn't need specific holds */
  68         boolean_t tx_anyobj;
  69 
  70         /* has this transaction already been delayed? */
  71         boolean_t tx_waited;
  72 
  73         /* time this transaction was created */
  74         hrtime_t tx_start;
  75 
  76         /* need to wait for sufficient dirty space */
  77         boolean_t tx_wait_dirty;
  78 
  79         int tx_err;
  80 #ifdef ZFS_DEBUG
  81         uint64_t tx_space_towrite;
  82         uint64_t tx_space_tofree;
  83         uint64_t tx_space_tooverwrite;
  84         uint64_t tx_space_tounref;
  85         refcount_t tx_space_written;
  86         refcount_t tx_space_freed;
  87 #endif
  88 };
  89 
  90 enum dmu_tx_hold_type {
  91         THT_NEWOBJECT,
  92         THT_WRITE,
  93         THT_BONUS,
  94         THT_FREE,
  95         THT_ZAP,
  96         THT_SPACE,
  97         THT_SPILL,
  98         THT_NUMTYPES
  99 };
 100 
 101 typedef struct dmu_tx_hold {
 102         dmu_tx_t *txh_tx;
 103         list_node_t txh_node;
 104         struct dnode *txh_dnode;
 105         uint64_t txh_space_towrite;
 106         uint64_t txh_space_tofree;
 107         uint64_t txh_space_tooverwrite;
 108         uint64_t txh_space_tounref;
 109         uint64_t txh_memory_tohold;
 110         uint64_t txh_fudge;
 111 #ifdef ZFS_DEBUG
 112         enum dmu_tx_hold_type txh_type;
 113         uint64_t txh_arg1;
 114         uint64_t txh_arg2;
 115 #endif
 116 } dmu_tx_hold_t;
 117 
 118 typedef struct dmu_tx_callback {
 119         list_node_t             dcb_node;    /* linked to tx_callbacks list */
 120         dmu_tx_callback_func_t  *dcb_func;   /* caller function pointer */
 121         void                    *dcb_data;   /* caller private data */
 122 } dmu_tx_callback_t;
 123 
 124 /*
 125  * These routines are defined in dmu.h, and are called by the user.
 126  */
 127 dmu_tx_t *dmu_tx_create(objset_t *dd);
 128 int dmu_tx_assign(dmu_tx_t *tx, txg_how_t txg_how);
 129 void dmu_tx_commit(dmu_tx_t *tx);
 130 void dmu_tx_abort(dmu_tx_t *tx);
 131 uint64_t dmu_tx_get_txg(dmu_tx_t *tx);
 132 struct dsl_pool *dmu_tx_pool(dmu_tx_t *tx);
 133 void dmu_tx_wait(dmu_tx_t *tx);
 134 
 135 void dmu_tx_callback_register(dmu_tx_t *tx, dmu_tx_callback_func_t *dcb_func,
 136     void *dcb_data);
 137 void dmu_tx_do_callbacks(list_t *cb_list, int error);
 138 
 139 /*
 140  * These routines are defined in dmu_spa.h, and are called by the SPA.
 141  */
 142 extern dmu_tx_t *dmu_tx_create_assigned(struct dsl_pool *dp, uint64_t txg);
 143 
 144 /*
 145  * These routines are only called by the DMU.
 146  */
 147 dmu_tx_t *dmu_tx_create_dd(dsl_dir_t *dd);
 148 int dmu_tx_is_syncing(dmu_tx_t *tx);
 149 int dmu_tx_private_ok(dmu_tx_t *tx);
 150 void dmu_tx_add_new_object(dmu_tx_t *tx, objset_t *os, uint64_t object);
 151 void dmu_tx_willuse_space(dmu_tx_t *tx, int64_t delta);
 152 void dmu_tx_dirty_buf(dmu_tx_t *tx, struct dmu_buf_impl *db);
 153 int dmu_tx_holds(dmu_tx_t *tx, uint64_t object);
 154 void dmu_tx_hold_space(dmu_tx_t *tx, uint64_t space);
 155 
 156 #ifdef ZFS_DEBUG
 157 #define DMU_TX_DIRTY_BUF(tx, db)        dmu_tx_dirty_buf(tx, db)
 158 #else
 159 #define DMU_TX_DIRTY_BUF(tx, db)
 160 #endif
 161 
 162 #ifdef  __cplusplus
 163 }
 164 #endif
 165 
 166 #endif  /* _SYS_DMU_TX_H */