2 * Copyright (c) 2013 Grzegorz Kostka (kostka.grzegorz@gmail.com)
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6 * Copyright (c) 2012 Martin Sucha
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7 * Copyright (c) 2012 Frantisek Princ
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8 * All rights reserved.
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10 * Redistribution and use in source and binary forms, with or without
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11 * modification, are permitted provided that the following conditions
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14 * - Redistributions of source code must retain the above copyright
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15 * notice, this list of conditions and the following disclaimer.
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16 * - Redistributions in binary form must reproduce the above copyright
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17 * notice, this list of conditions and the following disclaimer in the
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18 * documentation and/or other materials provided with the distribution.
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19 * - The name of the author may not be used to endorse or promote products
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20 * derived from this software without specific prior written permission.
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22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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34 /** @addtogroup lwext4
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39 * @brief Directory handle procedures.
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45 #include <ext4_config.h>
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46 #include <ext4_types.h>
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47 #include <ext4_blockdev.h>
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48 #include <ext4_super.h>
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52 /**@brief Get i-node number from directory entry.
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53 * @param de Directory entry
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54 * @return I-node number
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56 static inline uint32_t
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57 ext4_dir_entry_ll_get_inode(struct ext4_directory_entry_ll *de)
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59 return to_le32(de->inode);
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62 /**@brief Set i-node number to directory entry.
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63 * @param de Directory entry
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64 * @param inode I-node number
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67 ext4_dir_entry_ll_set_inode(struct ext4_directory_entry_ll *de, uint32_t inode)
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69 de->inode = to_le32(inode);
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72 /**@brief Get directory entry length.
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73 * @param de Directory entry
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74 * @return Entry length
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76 static inline uint16_t
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77 ext4_dir_entry_ll_get_entry_length(struct ext4_directory_entry_ll *de)
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79 return to_le16(de->entry_length);
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82 /**@brief Set directory entry length.
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83 * @param de Directory entry
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84 * @param length Entry length
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87 ext4_dir_entry_ll_set_entry_length(struct ext4_directory_entry_ll *de,
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90 de->entry_length = to_le16(len);
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93 /**@brief Get directory entry name length.
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94 * @param sb Superblock
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95 * @param de Directory entry
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96 * @return Entry name length
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98 static inline uint16_t
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99 ext4_dir_entry_ll_get_name_length(struct ext4_sblock *sb,
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100 struct ext4_directory_entry_ll *de)
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102 uint16_t v = de->name_length;
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104 if ((ext4_get32(sb, rev_level) == 0) &&
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105 (ext4_get32(sb, minor_rev_level) < 5))
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106 v |= ((uint16_t)de->in.name_length_high) << 8;
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111 /**@brief Set directory entry name length.
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112 * @param sb Superblock
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113 * @param de Directory entry
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114 * @param length Entry name length
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116 static inline void ext4_dir_entry_ll_set_name_length(
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117 struct ext4_sblock *sb, struct ext4_directory_entry_ll *de, uint16_t len)
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119 de->name_length = (len << 8) >> 8;
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121 if ((ext4_get32(sb, rev_level) == 0) &&
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122 (ext4_get32(sb, minor_rev_level) < 5))
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123 de->in.name_length_high = len >> 8;
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126 /**@brief Get i-node type of directory entry.
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127 * @param sb Superblock
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128 * @param de Directory entry
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129 * @return I-node type (file, dir, etc.)
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131 static inline uint8_t
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132 ext4_dir_entry_ll_get_inode_type(struct ext4_sblock *sb,
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133 struct ext4_directory_entry_ll *de)
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135 if ((ext4_get32(sb, rev_level) > 0) ||
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136 (ext4_get32(sb, minor_rev_level) >= 5))
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137 return de->in.inode_type;
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139 return EXT4_DIRECTORY_FILETYPE_UNKNOWN;
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141 /**@brief Set i-node type of directory entry.
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142 * @param sb Superblock
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143 * @param de Directory entry
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144 * @param type I-node type (file, dir, etc.)
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147 static inline void ext4_dir_entry_ll_set_inode_type(
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148 struct ext4_sblock *sb, struct ext4_directory_entry_ll *de, uint8_t type)
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150 if ((ext4_get32(sb, rev_level) > 0) ||
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151 (ext4_get32(sb, minor_rev_level) >= 5))
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152 de->in.inode_type = type;
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155 /**@brief Initialize directory iterator.
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156 * Set position to the first valid entry from the required position.
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157 * @param it Pointer to iterator to be initialized
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158 * @param inode_ref Directory i-node
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159 * @param pos Position to start reading entries from
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160 * @return Error code
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162 int ext4_dir_iterator_init(struct ext4_directory_iterator *it,
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163 struct ext4_inode_ref *inode_ref, uint64_t pos);
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165 /**@brief Jump to the next valid entry
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166 * @param it Initialized iterator
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167 * @return Error code
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169 int ext4_dir_iterator_next(struct ext4_directory_iterator *it);
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171 /**@brief Uninitialize directory iterator.
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172 * Release all allocated structures.
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173 * @param it Iterator to be finished
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174 * @return Error code
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176 int ext4_dir_iterator_fini(struct ext4_directory_iterator *it);
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178 /**@brief Write directory entry to concrete data block.
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179 * @param sb Superblock
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180 * @param entry Pointer to entry to be written
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181 * @param entry_len Length of new entry
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182 * @param child Child i-node to be written to new entry
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183 * @param name Name of the new entry
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184 * @param name_len Length of entry name
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186 void ext4_dir_write_entry(struct ext4_sblock *sb,
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187 struct ext4_directory_entry_ll *entry,
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188 uint16_t entry_len, struct ext4_inode_ref *child,
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189 const char *name, size_t name_len);
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191 /**@brief Add new entry to the directory.
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192 * @param parent Directory i-node
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193 * @param name Name of new entry
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194 * @param child I-node to be referenced from new entry
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195 * @return Error code
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197 int ext4_dir_add_entry(struct ext4_inode_ref *parent, const char *name,
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198 uint32_t name_len, struct ext4_inode_ref *child);
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200 /**@brief Find directory entry with passed name.
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201 * @param result Result structure to be returned if entry found
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202 * @param parent Directory i-node
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203 * @param name Name of entry to be found
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204 * @param name_len Name length
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205 * @return Error code
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207 int ext4_dir_find_entry(struct ext4_directory_search_result *result,
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208 struct ext4_inode_ref *parent, const char *name,
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209 uint32_t name_len);
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211 /**@brief Remove directory entry.
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212 * @param parent Directory i-node
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213 * @param name Name of the entry to be removed
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214 * @param name_len Name length
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215 * @return Error code
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217 int ext4_dir_remove_entry(struct ext4_inode_ref *parent, const char *name,
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218 uint32_t name_len);
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220 /**@brief Try to insert entry to concrete data block.
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221 * @param sb Superblock
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222 * @param target_block Block to try to insert entry to
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223 * @param child Child i-node to be inserted by new entry
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224 * @param name Name of the new entry
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225 * @param name_len Length of the new entry name
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226 * @return Error code
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228 int ext4_dir_try_insert_entry(struct ext4_sblock *sb,
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229 struct ext4_block *target_block,
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230 struct ext4_inode_ref *child, const char *name,
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231 uint32_t name_len);
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233 /**@brief Try to find entry in block by name.
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234 * @param block Block containing entries
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235 * @param sb Superblock
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236 * @param name_len Length of entry name
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237 * @param name Name of entry to be found
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238 * @param res_entry Output pointer to found entry, NULL if not found
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239 * @return Error code
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241 int ext4_dir_find_in_block(struct ext4_block *block, struct ext4_sblock *sb,
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242 size_t name_len, const char *name,
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243 struct ext4_directory_entry_ll **res_entry);
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245 /**@brief Simple function to release allocated data from result.
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246 * @param parent Parent inode
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247 * @param result Search result to destroy
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248 * @return Error code
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251 int ext4_dir_destroy_result(struct ext4_inode_ref *parent,
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252 struct ext4_directory_search_result *result);
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254 #endif /* EXT4_DIR_H_ */
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