1 | /* |
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2 | * IMFS_create_node() |
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3 | * |
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4 | * Routine to create a new in memory file system node. |
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5 | * |
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6 | * COPYRIGHT (c) 1989-2010. |
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7 | * On-Line Applications Research Corporation (OAR). |
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8 | * |
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9 | * The license and distribution terms for this file may be |
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10 | * found in the file LICENSE in this distribution or at |
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11 | * http://www.rtems.com/license/LICENSE. |
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12 | * |
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13 | * $Id$ |
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14 | */ |
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15 | |
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16 | #if HAVE_CONFIG_H |
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17 | #include "config.h" |
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18 | #endif |
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19 | |
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20 | #if defined(RTEMS_DEBUG) |
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21 | #include <assert.h> |
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22 | #endif |
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23 | #include <stdlib.h> |
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24 | #include <string.h> |
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25 | #include "imfs.h" |
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26 | #include <rtems/libio_.h> |
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27 | |
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28 | /* |
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29 | * Create an IMFS filesystem node of an arbitrary type that is NOT |
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30 | * the root directory node. |
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31 | */ |
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32 | IMFS_jnode_t *IMFS_create_node( |
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33 | rtems_filesystem_location_info_t *parent_loc, |
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34 | IMFS_jnode_types_t type, |
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35 | const char *name, |
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36 | mode_t mode, |
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37 | const IMFS_types_union *info |
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38 | ) |
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39 | { |
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40 | IMFS_jnode_t *node; |
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41 | IMFS_jnode_t *parent; |
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42 | IMFS_fs_info_t *fs_info; |
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43 | |
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44 | /* |
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45 | * MUST have a parent node to call this routine. |
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46 | */ |
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47 | if ( parent_loc == NULL ) |
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48 | return NULL; |
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49 | |
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50 | parent = parent_loc->node_access; |
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51 | fs_info = parent_loc->mt_entry->fs_info; |
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52 | |
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53 | /* |
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54 | * Reject creation of FIFOs if support is disabled. |
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55 | */ |
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56 | if ( type == IMFS_FIFO && |
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57 | fs_info->fifo_handlers == &rtems_filesystem_null_handlers ) |
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58 | return NULL; |
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59 | |
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60 | /* |
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61 | * Allocate filesystem node and fill in basic information |
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62 | */ |
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63 | node = IMFS_allocate_node( type, name, mode & ~rtems_filesystem_umask ); |
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64 | if ( !node ) |
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65 | return NULL; |
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66 | |
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67 | /* |
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68 | * Set the type specific information |
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69 | */ |
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70 | switch (type) { |
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71 | case IMFS_DIRECTORY: |
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72 | rtems_chain_initialize_empty(&node->info.directory.Entries); |
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73 | break; |
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74 | |
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75 | case IMFS_HARD_LINK: |
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76 | node->info.hard_link.link_node = info->hard_link.link_node; |
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77 | break; |
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78 | |
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79 | case IMFS_SYM_LINK: |
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80 | node->info.sym_link.name = info->sym_link.name; |
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81 | break; |
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82 | |
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83 | case IMFS_DEVICE: |
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84 | node->info.device.major = info->device.major; |
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85 | node->info.device.minor = info->device.minor; |
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86 | break; |
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87 | |
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88 | case IMFS_LINEAR_FILE: |
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89 | node->info.linearfile.size = 0; |
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90 | node->info.linearfile.direct = 0; |
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91 | |
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92 | case IMFS_MEMORY_FILE: |
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93 | node->info.file.size = 0; |
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94 | node->info.file.indirect = 0; |
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95 | node->info.file.doubly_indirect = 0; |
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96 | node->info.file.triply_indirect = 0; |
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97 | break; |
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98 | |
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99 | case IMFS_FIFO: |
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100 | node->info.fifo.pipe = NULL; |
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101 | break; |
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102 | |
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103 | default: |
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104 | #if defined(RTEMS_DEBUG) |
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105 | assert(0); |
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106 | #endif |
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107 | break; |
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108 | } |
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109 | |
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110 | /* |
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111 | * This node MUST have a parent, so put it in that directory list. |
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112 | */ |
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113 | |
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114 | node->Parent = parent; |
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115 | node->st_ino = ++fs_info->ino_count; |
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116 | |
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117 | rtems_chain_append( &parent->info.directory.Entries, &node->Node ); |
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118 | |
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119 | return node; |
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120 | } |
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121 | |
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122 | /* |
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123 | * Allocate filesystem node and fill in basic information |
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124 | */ |
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125 | IMFS_jnode_t *IMFS_allocate_node( |
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126 | IMFS_jnode_types_t type, |
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127 | const char *name, |
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128 | mode_t mode |
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129 | ) |
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130 | { |
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131 | IMFS_jnode_t *node; |
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132 | struct timeval tv; |
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133 | |
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134 | /* |
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135 | * Allocate an IMFS jnode |
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136 | */ |
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137 | node = calloc( 1, sizeof( IMFS_jnode_t ) ); |
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138 | if ( !node ) |
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139 | return NULL; |
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140 | |
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141 | /* |
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142 | * Fill in the basic information |
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143 | */ |
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144 | node->st_nlink = 1; |
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145 | node->type = type; |
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146 | strncpy( node->name, name, IMFS_NAME_MAX ); |
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147 | |
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148 | /* |
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149 | * Fill in the mode and permission information for the jnode structure. |
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150 | */ |
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151 | node->st_mode = mode; |
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152 | #if defined(RTEMS_POSIX_API) |
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153 | node->st_uid = geteuid(); |
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154 | node->st_gid = getegid(); |
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155 | #else |
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156 | node->st_uid = 0; |
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157 | node->st_gid = 0; |
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158 | #endif |
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159 | |
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160 | /* |
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161 | * Now set all the times. |
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162 | */ |
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163 | gettimeofday( &tv, 0 ); |
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164 | |
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165 | node->stat_atime = (time_t) tv.tv_sec; |
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166 | node->stat_mtime = (time_t) tv.tv_sec; |
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167 | node->stat_ctime = (time_t) tv.tv_sec; |
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168 | |
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169 | return node; |
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170 | } |
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171 | |
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172 | IMFS_jnode_t *IMFS_create_root_node(void) |
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173 | { |
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174 | IMFS_jnode_t *node; |
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175 | |
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176 | /* |
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177 | * Allocate filesystem node and fill in basic information |
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178 | */ |
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179 | node = IMFS_allocate_node( IMFS_DIRECTORY, "", (S_IFDIR | 0755) ); |
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180 | if ( !node ) |
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181 | return NULL; |
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182 | |
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183 | /* |
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184 | * Set the type specific information |
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185 | * |
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186 | * NOTE: Root node is always a directory. |
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187 | */ |
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188 | rtems_chain_initialize_empty(&node->info.directory.Entries); |
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189 | |
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190 | return node; |
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191 | } |
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