1 | /* |
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2 | * IMFS Initialization |
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3 | * |
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4 | * COPYRIGHT (c) 1989-1998. |
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5 | * On-Line Applications Research Corporation (OAR). |
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6 | * Copyright assigned to U.S. Government, 1994. |
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7 | * |
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8 | * The license and distribution terms for this file may be |
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9 | * found in the file LICENSE in this distribution or at |
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10 | * http://www.OARcorp.com/rtems/license.html. |
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11 | * |
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12 | * $Id$ |
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13 | */ |
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14 | |
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15 | #include <sys/types.h> /* for mkdir */ |
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16 | #include <fcntl.h> |
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17 | #include <unistd.h> |
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18 | #include <stdlib.h> |
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19 | |
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20 | #include <assert.h> |
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21 | |
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22 | #include "imfs.h" |
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23 | #include "libio_.h" |
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24 | |
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25 | #if defined(IMFS_DEBUG) |
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26 | #include <stdio.h> |
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27 | #endif |
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28 | |
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29 | /* |
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30 | * IMFS file system operations table |
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31 | */ |
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32 | |
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33 | rtems_filesystem_operations_table IMFS_ops = { |
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34 | IMFS_eval_path, |
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35 | IMFS_evaluate_for_make, |
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36 | IMFS_link, |
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37 | IMFS_unlink, |
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38 | IMFS_node_type, |
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39 | IMFS_mknod, |
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40 | IMFS_rmnod, |
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41 | IMFS_chown, |
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42 | IMFS_freenodinfo, |
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43 | IMFS_mount, |
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44 | IMFS_initialize, |
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45 | IMFS_unmount, |
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46 | IMFS_fsunmount, |
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47 | IMFS_utime, |
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48 | IMFS_evaluate_link, |
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49 | IMFS_symlink, |
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50 | IMFS_readlink |
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51 | }; |
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52 | |
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53 | /* |
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54 | * IMFS_initialize |
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55 | */ |
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56 | |
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57 | int IMFS_initialize( |
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58 | rtems_filesystem_mount_table_entry_t *temp_mt_entry |
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59 | ) |
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60 | { |
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61 | IMFS_fs_info_t *fs_info; |
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62 | IMFS_jnode_t *jnode; |
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63 | |
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64 | /* |
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65 | * Create the root node |
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66 | */ |
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67 | |
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68 | temp_mt_entry->mt_fs_root.node_access = IMFS_create_node( |
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69 | NULL, |
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70 | IMFS_DIRECTORY, |
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71 | "", |
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72 | ( S_IRWXO | S_IRWXG| S_IRWXU ), |
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73 | NULL |
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74 | ); |
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75 | |
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76 | temp_mt_entry->mt_fs_root.handlers = &dir_handlers; |
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77 | temp_mt_entry->mt_fs_root.ops = &IMFS_ops; |
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78 | temp_mt_entry->pathconf_limits_and_options = IMFS_LIMITS_AND_OPTIONS; |
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79 | |
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80 | /* |
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81 | * Create custom file system data. |
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82 | */ |
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83 | fs_info = calloc( 1, sizeof( IMFS_fs_info_t ) ); |
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84 | if ( !fs_info ){ |
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85 | free(temp_mt_entry->mt_fs_root.node_access); |
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86 | return 1; |
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87 | } |
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88 | temp_mt_entry->fs_info = fs_info; |
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89 | |
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90 | /* |
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91 | * Set st_ino for the root to 1. |
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92 | */ |
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93 | |
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94 | fs_info->ino_count = 1; |
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95 | |
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96 | jnode = temp_mt_entry->mt_fs_root.node_access; |
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97 | jnode->st_ino = fs_info->ino_count; |
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98 | |
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99 | return 0; |
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100 | } |
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101 | |
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102 | #define jnode_get_control( jnode ) \ |
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103 | (&jnode->info.directory.Entries) |
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104 | |
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105 | #define jnode_has_no_children( jnode ) \ |
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106 | Chain_Is_empty( jnode_get_control( jnode ) ) |
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107 | |
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108 | #define jnode_has_children( jnode ) \ |
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109 | ( ! jnode_has_no_children( jnode ) ) |
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110 | |
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111 | #define jnode_get_first_child( jnode ) \ |
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112 | ((IMFS_jnode_t *)( Chain_Head( jnode_get_control( jnode ) )->next)) |
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113 | |
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114 | |
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115 | int IMFS_fsunmount( |
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116 | rtems_filesystem_mount_table_entry_t *temp_mt_entry |
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117 | ) |
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118 | { |
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119 | IMFS_jnode_t *jnode; |
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120 | IMFS_jnode_t *next; |
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121 | rtems_filesystem_location_info_t loc; |
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122 | int result = 0; |
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123 | |
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124 | /* |
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125 | * Traverse tree that starts at the mt_fs_root and deallocate memory |
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126 | * associated memory space |
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127 | */ |
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128 | |
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129 | jnode = (IMFS_jnode_t *)temp_mt_entry->mt_fs_root.node_access; |
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130 | |
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131 | do { |
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132 | next = jnode->Parent; |
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133 | loc.node_access = (void *)jnode; |
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134 | |
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135 | if ( jnode->type != IMFS_DIRECTORY ) { |
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136 | result = IMFS_unlink( &loc ); |
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137 | if (result != 0) |
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138 | return -1; |
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139 | jnode = next; |
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140 | } else if ( jnode_has_no_children( jnode ) ) { |
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141 | result = IMFS_unlink( &loc ); |
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142 | if (result != 0) |
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143 | return -1; |
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144 | jnode = next; |
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145 | } |
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146 | if ( jnode != NULL ) { |
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147 | if ( jnode->type == IMFS_DIRECTORY ) { |
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148 | if ( jnode_has_children( jnode ) ) |
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149 | jnode = jnode_get_first_child( jnode ); |
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150 | } |
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151 | } |
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152 | } while (jnode != NULL); |
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153 | |
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154 | return 0; |
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155 | } |
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156 | |
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157 | |
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158 | |
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