include/sys/dmu_tx.h

   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 DEBUG_DMU_TX
  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 DEBUG_DMU_TX
 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  * Used for dmu tx kstat.
 126  */
 127 typedef struct dmu_tx_stats {
 128         kstat_named_t dmu_tx_assigned;
 129         kstat_named_t dmu_tx_delay;
 130         kstat_named_t dmu_tx_error;
 131         kstat_named_t dmu_tx_suspended;
 132         kstat_named_t dmu_tx_group;
 133         kstat_named_t dmu_tx_how;
 134         kstat_named_t dmu_tx_memory_reserve;
 135         kstat_named_t dmu_tx_memory_reclaim;
 136         kstat_named_t dmu_tx_memory_inflight;
 137         kstat_named_t dmu_tx_dirty_throttle;
 138         kstat_named_t dmu_tx_dirty_delay;
 139         kstat_named_t dmu_tx_dirty_over_max;
 140         kstat_named_t dmu_tx_quota;
 141 } dmu_tx_stats_t;
 142
 143 extern dmu_tx_stats_t dmu_tx_stats;
 144
 145 #define DMU_TX_STAT_INCR(stat, val) \
 146     atomic_add_64(&dmu_tx_stats.stat.value.ui64, (val));
 147 #define DMU_TX_STAT_BUMP(stat) \
 148     DMU_TX_STAT_INCR(stat, 1);
 149
 150 /*
 151  * These routines are defined in dmu.h, and are called by the user.
 152  */
 153 dmu_tx_t *dmu_tx_create(objset_t *dd);
 154 int dmu_tx_assign(dmu_tx_t *tx, txg_how_t txg_how);
 155 void dmu_tx_commit(dmu_tx_t *tx);
 156 void dmu_tx_abort(dmu_tx_t *tx);
 157 uint64_t dmu_tx_get_txg(dmu_tx_t *tx);
 158 struct dsl_pool *dmu_tx_pool(dmu_tx_t *tx);
 159 void dmu_tx_wait(dmu_tx_t *tx);
 160
 161 void dmu_tx_callback_register(dmu_tx_t *tx, dmu_tx_callback_func_t *dcb_func,
 162     void *dcb_data);
 163 void dmu_tx_do_callbacks(list_t *cb_list, int error);
 164
 165 /*
 166  * These routines are defined in dmu_spa.h, and are called by the SPA.
 167  */
 168 extern dmu_tx_t *dmu_tx_create_assigned(struct dsl_pool *dp, uint64_t txg);
 169
 170 /*
 171  * These routines are only called by the DMU.
 172  */
 173 dmu_tx_t *dmu_tx_create_dd(dsl_dir_t *dd);
 174 int dmu_tx_is_syncing(dmu_tx_t *tx);
 175 int dmu_tx_private_ok(dmu_tx_t *tx);
 176 void dmu_tx_add_new_object(dmu_tx_t *tx, objset_t *os, uint64_t object);
 177 void dmu_tx_willuse_space(dmu_tx_t *tx, int64_t delta);
 178 void dmu_tx_dirty_buf(dmu_tx_t *tx, struct dmu_buf_impl *db);
 179 int dmu_tx_holds(dmu_tx_t *tx, uint64_t object);
 180 void dmu_tx_hold_space(dmu_tx_t *tx, uint64_t space);
 181
 182 #ifdef DEBUG_DMU_TX
 183 #define DMU_TX_DIRTY_BUF(tx, db)        dmu_tx_dirty_buf(tx, db)
 184 #else
 185 #define DMU_TX_DIRTY_BUF(tx, db)
 186 #endif
 187
 188 void dmu_tx_init(void);
 189 void dmu_tx_fini(void);
 190
 191 #ifdef  __cplusplus
 192 }
 193 #endif
 194
 195 #endif  /* _SYS_DMU_TX_H */