1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief IMFS Node Support |
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5 | * @ingroup IMFS |
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6 | */ |
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7 | |
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8 | /* |
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9 | * COPYRIGHT (c) 1989-2010. |
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10 | * On-Line Applications Research Corporation (OAR). |
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11 | * |
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12 | * The license and distribution terms for this file may be |
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13 | * found in the file LICENSE in this distribution or at |
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14 | * http://www.rtems.org/license/LICENSE. |
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15 | */ |
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16 | |
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17 | #if HAVE_CONFIG_H |
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18 | #include "config.h" |
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19 | #endif |
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20 | |
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21 | #include "imfs.h" |
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22 | |
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23 | #include <errno.h> |
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24 | #include <stdlib.h> |
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25 | #include <string.h> |
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26 | #include <unistd.h> |
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27 | |
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28 | /* |
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29 | * IMFS_determine_bytes_per_block |
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30 | */ |
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31 | int imfs_memfile_bytes_per_block = 0; |
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32 | |
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33 | static int IMFS_determine_bytes_per_block( |
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34 | int *dest_bytes_per_block, |
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35 | int requested_bytes_per_block, |
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36 | int default_bytes_per_block |
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37 | ) |
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38 | { |
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39 | bool is_valid = false; |
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40 | int bit_mask; |
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41 | |
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42 | /* |
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43 | * check, whether requested bytes per block is valid |
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44 | */ |
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45 | for (bit_mask = 16; !is_valid && (bit_mask <= 512); bit_mask <<= 1) { |
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46 | if (bit_mask == requested_bytes_per_block) { |
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47 | is_valid = true; |
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48 | break; |
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49 | } |
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50 | if(bit_mask > requested_bytes_per_block) |
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51 | break; |
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52 | } |
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53 | *dest_bytes_per_block = ((is_valid) |
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54 | ? requested_bytes_per_block |
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55 | : default_bytes_per_block); |
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56 | return 0; |
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57 | } |
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58 | |
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59 | IMFS_jnode_t *IMFS_initialize_node( |
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60 | IMFS_jnode_t *node, |
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61 | const IMFS_node_control *node_control, |
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62 | const char *name, |
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63 | size_t namelen, |
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64 | mode_t mode, |
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65 | void *arg |
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66 | ) |
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67 | { |
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68 | struct timeval tv; |
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69 | |
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70 | if ( namelen > IMFS_NAME_MAX ) { |
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71 | errno = ENAMETOOLONG; |
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72 | |
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73 | return NULL; |
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74 | } |
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75 | |
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76 | gettimeofday( &tv, 0 ); |
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77 | |
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78 | /* |
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79 | * Fill in the basic information |
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80 | */ |
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81 | node->reference_count = 1; |
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82 | node->st_nlink = 1; |
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83 | memcpy( node->name, name, namelen ); |
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84 | node->name [namelen] = '\0'; |
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85 | node->control = node_control; |
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86 | |
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87 | /* |
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88 | * Fill in the mode and permission information for the jnode structure. |
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89 | */ |
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90 | node->st_mode = mode; |
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91 | node->st_uid = geteuid(); |
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92 | node->st_gid = getegid(); |
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93 | |
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94 | /* |
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95 | * Now set all the times. |
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96 | */ |
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97 | |
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98 | node->stat_atime = (time_t) tv.tv_sec; |
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99 | node->stat_mtime = (time_t) tv.tv_sec; |
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100 | node->stat_ctime = (time_t) tv.tv_sec; |
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101 | |
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102 | return (*node_control->node_initialize)( node, arg ); |
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103 | } |
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104 | |
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105 | int IMFS_initialize_support( |
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106 | rtems_filesystem_mount_table_entry_t *mt_entry, |
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107 | const void *data |
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108 | ) |
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109 | { |
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110 | const IMFS_mount_data *mount_data = data; |
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111 | IMFS_fs_info_t *fs_info = mount_data->fs_info; |
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112 | IMFS_jnode_t *root_node; |
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113 | |
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114 | fs_info->mknod_controls = mount_data->mknod_controls; |
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115 | |
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116 | root_node = IMFS_initialize_node( |
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117 | &fs_info->Root_directory.Node, |
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118 | &fs_info->mknod_controls->directory->node_control, |
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119 | "", |
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120 | 0, |
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121 | (S_IFDIR | 0755), |
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122 | NULL |
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123 | ); |
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124 | IMFS_assert( root_node != NULL ); |
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125 | |
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126 | mt_entry->fs_info = fs_info; |
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127 | mt_entry->ops = mount_data->ops; |
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128 | mt_entry->pathconf_limits_and_options = &IMFS_LIMITS_AND_OPTIONS; |
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129 | mt_entry->mt_fs_root->location.node_access = root_node; |
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130 | IMFS_Set_handlers( &mt_entry->mt_fs_root->location ); |
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131 | |
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132 | IMFS_determine_bytes_per_block( |
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133 | &imfs_memfile_bytes_per_block, |
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134 | imfs_rq_memfile_bytes_per_block, |
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135 | IMFS_MEMFILE_DEFAULT_BYTES_PER_BLOCK |
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136 | ); |
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137 | |
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138 | return 0; |
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139 | } |
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140 | |
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141 | int IMFS_node_clone( rtems_filesystem_location_info_t *loc ) |
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142 | { |
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143 | IMFS_jnode_t *node = loc->node_access; |
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144 | |
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145 | ++node->reference_count; |
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146 | |
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147 | return 0; |
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148 | } |
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149 | |
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150 | void IMFS_node_destroy( IMFS_jnode_t *node ) |
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151 | { |
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152 | IMFS_assert( node->reference_count == 0 ); |
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153 | |
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154 | (*node->control->node_destroy)( node ); |
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155 | } |
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156 | |
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157 | void IMFS_node_free( const rtems_filesystem_location_info_t *loc ) |
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158 | { |
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159 | IMFS_jnode_t *node = loc->node_access; |
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160 | |
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161 | --node->reference_count; |
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162 | |
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163 | if ( node->reference_count == 0 ) { |
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164 | IMFS_node_destroy( node ); |
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165 | } |
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166 | } |
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167 | |
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168 | static IMFS_jnode_t *IMFS_node_initialize_enosys( |
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169 | IMFS_jnode_t *node, |
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170 | void *arg |
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171 | ) |
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172 | { |
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173 | errno = ENOSYS; |
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174 | |
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175 | return NULL; |
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176 | } |
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177 | |
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178 | IMFS_jnode_t *IMFS_node_initialize_default( |
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179 | IMFS_jnode_t *node, |
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180 | void *arg |
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181 | ) |
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182 | { |
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183 | return node; |
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184 | } |
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185 | |
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186 | IMFS_jnode_t *IMFS_node_remove_default( |
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187 | IMFS_jnode_t *node |
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188 | ) |
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189 | { |
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190 | return node; |
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191 | } |
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192 | |
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193 | void IMFS_node_destroy_default( IMFS_jnode_t *node ) |
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194 | { |
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195 | free( node ); |
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196 | } |
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197 | |
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198 | const IMFS_mknod_control IMFS_mknod_control_enosys = { |
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199 | { |
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200 | .handlers = &rtems_filesystem_handlers_default, |
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201 | .node_initialize = IMFS_node_initialize_enosys, |
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202 | .node_remove = IMFS_node_remove_default, |
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203 | .node_destroy = IMFS_node_destroy_default |
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204 | }, |
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205 | .node_size = sizeof( IMFS_jnode_t ) |
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206 | }; |
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