1 | /*- |
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2 | * Copyright (c) 1990, 1993, 1994 |
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3 | * The Regents of the University of California. All rights reserved. |
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4 | * |
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5 | * This code is derived from software contributed to Berkeley by |
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6 | * Mike Olson. |
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7 | * |
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8 | * Redistribution and use in source and binary forms, with or without |
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9 | * modification, are permitted provided that the following conditions |
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10 | * are met: |
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11 | * 1. Redistributions of source code must retain the above copyright |
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12 | * notice, this list of conditions and the following disclaimer. |
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13 | * 2. Redistributions in binary form must reproduce the above copyright |
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14 | * notice, this list of conditions and the following disclaimer in the |
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15 | * documentation and/or other materials provided with the distribution. |
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16 | * 4. Neither the name of the University nor the names of its contributors |
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17 | * may be used to endorse or promote products derived from this software |
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18 | * without specific prior written permission. |
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19 | * |
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20 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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21 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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22 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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23 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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24 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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25 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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26 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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27 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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28 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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29 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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30 | * SUCH DAMAGE. |
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31 | */ |
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32 | |
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33 | #if defined(LIBC_SCCS) && !defined(lint) |
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34 | static char sccsid[] = "@(#)bt_close.c 8.7 (Berkeley) 8/17/94"; |
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35 | #endif /* LIBC_SCCS and not lint */ |
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36 | #include <sys/cdefs.h> |
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37 | __FBSDID("$FreeBSD$"); |
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38 | |
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39 | #include "namespace.h" |
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40 | #include <rtems/bsd/sys/param.h> |
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41 | |
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42 | #include <errno.h> |
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43 | #include <stdio.h> |
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44 | #include <stdlib.h> |
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45 | #include <string.h> |
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46 | #include <unistd.h> |
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47 | #include "un-namespace.h" |
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48 | |
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49 | #include <db.h> |
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50 | #include "btree.h" |
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51 | |
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52 | static int bt_meta(BTREE *); |
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53 | |
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54 | /* |
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55 | * BT_CLOSE -- Close a btree. |
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56 | * |
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57 | * Parameters: |
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58 | * dbp: pointer to access method |
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59 | * |
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60 | * Returns: |
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61 | * RET_ERROR, RET_SUCCESS |
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62 | */ |
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63 | int |
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64 | __bt_close(DB *dbp) |
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65 | { |
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66 | BTREE *t; |
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67 | int fd; |
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68 | |
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69 | t = dbp->internal; |
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70 | |
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71 | /* Toss any page pinned across calls. */ |
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72 | if (t->bt_pinned != NULL) { |
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73 | mpool_put(t->bt_mp, t->bt_pinned, 0); |
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74 | t->bt_pinned = NULL; |
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75 | } |
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76 | |
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77 | /* Sync the tree. */ |
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78 | if (__bt_sync(dbp, 0) == RET_ERROR) |
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79 | return (RET_ERROR); |
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80 | |
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81 | /* Close the memory pool. */ |
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82 | if (mpool_close(t->bt_mp) == RET_ERROR) |
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83 | return (RET_ERROR); |
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84 | |
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85 | /* Free random memory. */ |
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86 | if (t->bt_cursor.key.data != NULL) { |
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87 | free(t->bt_cursor.key.data); |
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88 | t->bt_cursor.key.size = 0; |
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89 | t->bt_cursor.key.data = NULL; |
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90 | } |
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91 | if (t->bt_rkey.data) { |
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92 | free(t->bt_rkey.data); |
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93 | t->bt_rkey.size = 0; |
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94 | t->bt_rkey.data = NULL; |
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95 | } |
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96 | if (t->bt_rdata.data) { |
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97 | free(t->bt_rdata.data); |
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98 | t->bt_rdata.size = 0; |
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99 | t->bt_rdata.data = NULL; |
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100 | } |
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101 | |
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102 | fd = t->bt_fd; |
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103 | free(t); |
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104 | free(dbp); |
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105 | return (_close(fd) ? RET_ERROR : RET_SUCCESS); |
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106 | } |
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107 | |
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108 | /* |
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109 | * BT_SYNC -- sync the btree to disk. |
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110 | * |
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111 | * Parameters: |
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112 | * dbp: pointer to access method |
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113 | * |
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114 | * Returns: |
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115 | * RET_SUCCESS, RET_ERROR. |
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116 | */ |
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117 | int |
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118 | __bt_sync(const DB *dbp, u_int flags) |
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119 | { |
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120 | BTREE *t; |
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121 | int status; |
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122 | |
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123 | t = dbp->internal; |
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124 | |
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125 | /* Toss any page pinned across calls. */ |
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126 | if (t->bt_pinned != NULL) { |
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127 | mpool_put(t->bt_mp, t->bt_pinned, 0); |
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128 | t->bt_pinned = NULL; |
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129 | } |
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130 | |
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131 | /* Sync doesn't currently take any flags. */ |
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132 | if (flags != 0) { |
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133 | errno = EINVAL; |
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134 | return (RET_ERROR); |
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135 | } |
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136 | |
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137 | if (F_ISSET(t, B_INMEM | B_RDONLY) || !F_ISSET(t, B_MODIFIED)) |
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138 | return (RET_SUCCESS); |
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139 | |
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140 | if (F_ISSET(t, B_METADIRTY) && bt_meta(t) == RET_ERROR) |
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141 | return (RET_ERROR); |
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142 | |
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143 | if ((status = mpool_sync(t->bt_mp)) == RET_SUCCESS) |
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144 | F_CLR(t, B_MODIFIED); |
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145 | |
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146 | return (status); |
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147 | } |
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148 | |
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149 | /* |
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150 | * BT_META -- write the tree meta data to disk. |
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151 | * |
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152 | * Parameters: |
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153 | * t: tree |
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154 | * |
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155 | * Returns: |
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156 | * RET_ERROR, RET_SUCCESS |
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157 | */ |
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158 | static int |
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159 | bt_meta(BTREE *t) |
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160 | { |
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161 | BTMETA m; |
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162 | void *p; |
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163 | |
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164 | if ((p = mpool_get(t->bt_mp, P_META, 0)) == NULL) |
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165 | return (RET_ERROR); |
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166 | |
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167 | /* Fill in metadata. */ |
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168 | m.magic = BTREEMAGIC; |
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169 | m.version = BTREEVERSION; |
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170 | m.psize = t->bt_psize; |
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171 | m.free = t->bt_free; |
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172 | m.nrecs = t->bt_nrecs; |
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173 | m.flags = F_ISSET(t, SAVEMETA); |
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174 | |
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175 | memmove(p, &m, sizeof(BTMETA)); |
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176 | mpool_put(t->bt_mp, p, MPOOL_DIRTY); |
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177 | return (RET_SUCCESS); |
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178 | } |
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