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annotate usr/src/uts/common/fs/zfs/dsl_synctask.c @ 13980:d7059eb1884c

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3598 want to dtrace when errors are generated in zfs Reviewed by: Dan Kimmel <dan.kimmel@delphix.com> Reviewed by: Adam Leventhal <ahl@delphix.com> Reviewed by: Christopher Siden <christopher.siden@delphix.com> Approved by: Garrett D'Amore <garrett@damore.org>
author Matthew Ahrens <mahrens@delphix.com>
date Fri, 08 Mar 2013 10:41:28 -0800
parents 4972ab336f54
children
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1 /*
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2 * CDDL HEADER START
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3 *
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4 * The contents of this file are subject to the terms of the
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5 * Common Development and Distribution License (the "License").
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6 * You may not use this file except in compliance with the License.
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7 *
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8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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9 * or http://www.opensolaris.org/os/licensing.
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10 * See the License for the specific language governing permissions
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11 * and limitations under the License.
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12 *
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13 * When distributing Covered Code, include this CDDL HEADER in each
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14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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15 * If applicable, add the following below this CDDL HEADER, with the
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16 * fields enclosed by brackets "[]" replaced with your own identifying
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17 * information: Portions Copyright [yyyy] [name of copyright owner]
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18 *
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19 * CDDL HEADER END
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20 */
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21 /*
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22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
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23 * Copyright (c) 2013 by Delphix. All rights reserved.
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24 */
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25
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26 #include <sys/dmu.h>
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27 #include <sys/dmu_tx.h>
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28 #include <sys/dsl_pool.h>
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29 #include <sys/dsl_dir.h>
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30 #include <sys/dsl_synctask.h>
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31 #include <sys/metaslab.h>
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32
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33 #define DST_AVG_BLKSHIFT 14
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34
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35 /* ARGSUSED */
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36 static int
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37 dsl_null_checkfunc(void *arg, dmu_tx_t *tx)
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38 {
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39 return (0);
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40 }
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41
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42 /*
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43 * Called from open context to perform a callback in syncing context. Waits
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44 * for the operation to complete.
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45 *
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46 * The checkfunc will be called from open context as a preliminary check
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47 * which can quickly fail. If it succeeds, it will be called again from
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48 * syncing context. The checkfunc should generally be designed to work
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49 * properly in either context, but if necessary it can check
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50 * dmu_tx_is_syncing(tx).
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51 *
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52 * The synctask infrastructure enforces proper locking strategy with respect
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53 * to the dp_config_rwlock -- the lock will always be held when the callbacks
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54 * are called. It will be held for read during the open-context (preliminary)
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55 * call to the checkfunc, and then held for write from syncing context during
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56 * the calls to the check and sync funcs.
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57 *
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58 * A dataset or pool name can be passed as the first argument. Typically,
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59 * the check func will hold, check the return value of the hold, and then
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60 * release the dataset. The sync func will VERIFYO(hold()) the dataset.
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61 * This is safe because no changes can be made between the check and sync funcs,
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62 * and the sync func will only be called if the check func successfully opened
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63 * the dataset.
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64 */
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65 int
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66 dsl_sync_task(const char *pool, dsl_checkfunc_t *checkfunc,
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67 dsl_syncfunc_t *syncfunc, void *arg, int blocks_modified)
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68 {
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69 spa_t *spa;
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70 dmu_tx_t *tx;
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71 int err;
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72 dsl_sync_task_t dst = { 0 };
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73 dsl_pool_t *dp;
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74
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75 err = spa_open(pool, &spa, FTAG);
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76 if (err != 0)
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77 return (err);
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78 dp = spa_get_dsl(spa);
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79
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80 top:
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81 tx = dmu_tx_create_dd(dp->dp_mos_dir);
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82 VERIFY0(dmu_tx_assign(tx, TXG_WAIT));
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83
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84 dst.dst_pool = dp;
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85 dst.dst_txg = dmu_tx_get_txg(tx);
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86 dst.dst_space = blocks_modified << DST_AVG_BLKSHIFT;
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87 dst.dst_checkfunc = checkfunc != NULL ? checkfunc : dsl_null_checkfunc;
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88 dst.dst_syncfunc = syncfunc;
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89 dst.dst_arg = arg;
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90 dst.dst_error = 0;
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91 dst.dst_nowaiter = B_FALSE;
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92
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93 dsl_pool_config_enter(dp, FTAG);
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94 err = dst.dst_checkfunc(arg, tx);
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95 dsl_pool_config_exit(dp, FTAG);
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96
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97 if (err != 0) {
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98 dmu_tx_commit(tx);
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99 spa_close(spa, FTAG);
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100 return (err);
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101 }
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102
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103 VERIFY(txg_list_add_tail(&dp->dp_sync_tasks, &dst, dst.dst_txg));
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104
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105 dmu_tx_commit(tx);
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106
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107 txg_wait_synced(dp, dst.dst_txg);
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108
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109 if (dst.dst_error == EAGAIN) {
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110 txg_wait_synced(dp, dst.dst_txg + TXG_DEFER_SIZE);
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111 goto top;
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112 }
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113
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114 spa_close(spa, FTAG);
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115 return (dst.dst_error);
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116 }
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117
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118 void
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119 dsl_sync_task_nowait(dsl_pool_t *dp, dsl_syncfunc_t *syncfunc, void *arg,
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120 int blocks_modified, dmu_tx_t *tx)
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121 {
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122 dsl_sync_task_t *dst = kmem_zalloc(sizeof (*dst), KM_SLEEP);
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123
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124 dst->dst_pool = dp;
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125 dst->dst_txg = dmu_tx_get_txg(tx);
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126 dst->dst_space = blocks_modified << DST_AVG_BLKSHIFT;
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127 dst->dst_checkfunc = dsl_null_checkfunc;
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128 dst->dst_syncfunc = syncfunc;
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129 dst->dst_arg = arg;
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130 dst->dst_error = 0;
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131 dst->dst_nowaiter = B_TRUE;
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132
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133 VERIFY(txg_list_add_tail(&dp->dp_sync_tasks, dst, dst->dst_txg));
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134 }
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135
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136 /*
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137 * Called in syncing context to execute the synctask.
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138 */
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139 void
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140 dsl_sync_task_sync(dsl_sync_task_t *dst, dmu_tx_t *tx)
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141 {
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142 dsl_pool_t *dp = dst->dst_pool;
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143 uint64_t quota, used;
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144
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145 ASSERT0(dst->dst_error);
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146
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147 /*
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148 * Check for sufficient space. We just check against what's
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149 * on-disk; we don't want any in-flight accounting to get in our
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150 * way, because open context may have already used up various
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151 * in-core limits (arc_tempreserve, dsl_pool_tempreserve).
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152 */
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153 quota = dsl_pool_adjustedsize(dp, B_FALSE) -
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154 metaslab_class_get_deferred(spa_normal_class(dp->dp_spa));
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155 used = dp->dp_root_dir->dd_phys->dd_used_bytes;
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156 /* MOS space is triple-dittoed, so we multiply by 3. */
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157 if (dst->dst_space > 0 && used + dst->dst_space * 3 > quota) {
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158 dst->dst_error = SET_ERROR(ENOSPC);
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159 if (dst->dst_nowaiter)
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160 kmem_free(dst, sizeof (*dst));
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161 return;
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162 }
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163
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164 /*
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165 * Check for errors by calling checkfunc.
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166 */
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167 rrw_enter(&dp->dp_config_rwlock, RW_WRITER, FTAG);
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168 dst->dst_error = dst->dst_checkfunc(dst->dst_arg, tx);
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169 if (dst->dst_error == 0)
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170 dst->dst_syncfunc(dst->dst_arg, tx);
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171 rrw_exit(&dp->dp_config_rwlock, FTAG);
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172 if (dst->dst_nowaiter)
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173 kmem_free(dst, sizeof (*dst));
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174 }