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 | |
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27 | /* |
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28 | * IMFS_determine_bytes_per_block |
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29 | */ |
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30 | int imfs_memfile_bytes_per_block = 0; |
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31 | |
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32 | static int IMFS_determine_bytes_per_block( |
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33 | int *dest_bytes_per_block, |
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34 | int requested_bytes_per_block, |
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35 | int default_bytes_per_block |
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36 | ) |
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37 | { |
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38 | bool is_valid = false; |
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39 | int bit_mask; |
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40 | |
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41 | /* |
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42 | * check, whether requested bytes per block is valid |
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43 | */ |
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44 | for (bit_mask = 16; !is_valid && (bit_mask <= 512); bit_mask <<= 1) { |
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45 | if (bit_mask == requested_bytes_per_block) { |
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46 | is_valid = true; |
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47 | break; |
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48 | } |
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49 | if(bit_mask > requested_bytes_per_block) |
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50 | break; |
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51 | } |
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52 | *dest_bytes_per_block = ((is_valid) |
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53 | ? requested_bytes_per_block |
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54 | : default_bytes_per_block); |
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55 | return 0; |
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56 | } |
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57 | |
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58 | int IMFS_initialize_support( |
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59 | rtems_filesystem_mount_table_entry_t *mt_entry, |
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60 | const rtems_filesystem_operations_table *op_table, |
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61 | const IMFS_node_control *const node_controls [IMFS_TYPE_COUNT] |
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62 | ) |
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63 | { |
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64 | static int imfs_instance; |
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65 | |
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66 | int rv = 0; |
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67 | IMFS_fs_info_t *fs_info = calloc( 1, sizeof( *fs_info ) ); |
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68 | |
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69 | if ( fs_info != NULL ) { |
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70 | IMFS_jnode_t *root_node; |
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71 | |
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72 | fs_info->instance = imfs_instance++; |
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73 | memcpy( |
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74 | fs_info->node_controls, |
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75 | node_controls, |
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76 | sizeof( fs_info->node_controls ) |
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77 | ); |
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78 | |
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79 | root_node = IMFS_allocate_node( |
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80 | fs_info, |
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81 | fs_info->node_controls [IMFS_DIRECTORY], |
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82 | "", |
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83 | 0, |
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84 | (S_IFDIR | 0755), |
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85 | NULL |
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86 | ); |
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87 | if ( root_node != NULL ) { |
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88 | mt_entry->fs_info = fs_info; |
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89 | mt_entry->ops = op_table; |
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90 | mt_entry->pathconf_limits_and_options = &IMFS_LIMITS_AND_OPTIONS; |
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91 | mt_entry->mt_fs_root->location.node_access = root_node; |
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92 | IMFS_Set_handlers( &mt_entry->mt_fs_root->location ); |
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93 | } else { |
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94 | free(fs_info); |
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95 | errno = ENOMEM; |
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96 | rv = -1; |
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97 | } |
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98 | } else { |
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99 | errno = ENOMEM; |
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100 | rv = -1; |
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101 | } |
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102 | |
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103 | if ( rv == 0 ) { |
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104 | IMFS_determine_bytes_per_block( |
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105 | &imfs_memfile_bytes_per_block, |
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106 | imfs_rq_memfile_bytes_per_block, |
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107 | IMFS_MEMFILE_DEFAULT_BYTES_PER_BLOCK |
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108 | ); |
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109 | } |
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110 | |
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111 | return rv; |
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112 | } |
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113 | |
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114 | int IMFS_node_clone( rtems_filesystem_location_info_t *loc ) |
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115 | { |
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116 | IMFS_jnode_t *node = loc->node_access; |
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117 | |
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118 | ++node->reference_count; |
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119 | |
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120 | return 0; |
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121 | } |
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122 | |
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123 | void IMFS_node_destroy( IMFS_jnode_t *node ) |
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124 | { |
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125 | IMFS_assert( node->reference_count == 0 ); |
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126 | |
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127 | (*node->control->node_destroy)( node ); |
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128 | } |
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129 | |
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130 | void IMFS_node_free( const rtems_filesystem_location_info_t *loc ) |
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131 | { |
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132 | IMFS_jnode_t *node = loc->node_access; |
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133 | |
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134 | --node->reference_count; |
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135 | |
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136 | if ( node->reference_count == 0 ) { |
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137 | IMFS_node_destroy( node ); |
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138 | } |
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139 | } |
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140 | |
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141 | static IMFS_jnode_t *IMFS_node_initialize_enosys( |
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142 | IMFS_jnode_t *node, |
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143 | void *arg |
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144 | ) |
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145 | { |
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146 | errno = ENOSYS; |
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147 | |
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148 | return NULL; |
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149 | } |
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150 | |
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151 | IMFS_jnode_t *IMFS_node_initialize_default( |
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152 | IMFS_jnode_t *node, |
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153 | void *arg |
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154 | ) |
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155 | { |
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156 | return node; |
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157 | } |
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158 | |
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159 | IMFS_jnode_t *IMFS_node_remove_default( |
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160 | IMFS_jnode_t *node |
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161 | ) |
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162 | { |
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163 | return node; |
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164 | } |
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165 | |
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166 | void IMFS_node_destroy_default( IMFS_jnode_t *node ) |
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167 | { |
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168 | free( node ); |
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169 | } |
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170 | |
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171 | const IMFS_node_control IMFS_node_control_enosys = { |
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172 | .handlers = &rtems_filesystem_handlers_default, |
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173 | .node_size = sizeof(IMFS_jnode_t), |
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174 | .node_initialize = IMFS_node_initialize_enosys, |
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175 | .node_remove = IMFS_node_remove_default, |
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176 | .node_destroy = IMFS_node_destroy_default |
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177 | }; |
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