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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38 * @file ext4_extent.h
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39 * @brief More complex filesystem functions.
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41 #ifndef EXT4_EXTENT_H_
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42 #define EXT4_EXTENT_H_
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44 #include <ext4_config.h>
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45 #include <ext4_types.h>
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47 /**@brief Get logical number of the block covered by extent.
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48 * @param extent Extent to load number from
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49 * @return Logical number of the first block covered by extent */
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50 uint32_t ext4_extent_get_first_block(struct ext4_extent *extent);
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52 /**@brief Set logical number of the first block covered by extent.
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53 * @param extent Extent to set number to
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54 * @param iblock Logical number of the first block covered by extent */
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55 void ext4_extent_set_first_block(struct ext4_extent *extent, uint32_t iblock);
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57 /**@brief Get number of blocks covered by extent.
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58 * @param extent Extent to load count from
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59 * @return Number of blocks covered by extent */
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60 uint16_t ext4_extent_get_block_count(struct ext4_extent *extent);
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62 /**@brief Set number of blocks covered by extent.
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63 * @param extent Extent to load count from
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64 * @param count Number of blocks covered by extent */
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65 void ext4_extent_set_block_count(struct ext4_extent *extent, uint16_t count);
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67 /**@brief Get physical number of the first block covered by extent.
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68 * @param extent Extent to load number
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69 * @return Physical number of the first block covered by extent */
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70 uint64_t ext4_extent_get_start(struct ext4_extent *extent);
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72 /**@brief Set physical number of the first block covered by extent.
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73 * @param extent Extent to load number
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74 * @param fblock Physical number of the first block covered by extent */
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75 void ext4_extent_set_start(struct ext4_extent *extent, uint64_t fblock);
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77 /**@brief Get logical number of the block covered by extent index.
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78 * @param index Extent index to load number from
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79 * @return Logical number of the first block covered by extent index */
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80 uint32_t ext4_extent_index_get_first_block(struct ext4_extent_index *index);
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82 /**@brief Set logical number of the block covered by extent index.
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83 * @param index Extent index to set number to
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84 * @param iblock Logical number of the first block covered by extent index */
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85 void ext4_extent_index_set_first_block(struct ext4_extent_index *index,
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88 /**@brief Get physical number of block where the child node is located.
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89 * @param index Extent index to load number from
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90 * @return Physical number of the block with child node */
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91 uint64_t ext4_extent_index_get_leaf(struct ext4_extent_index *index);
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93 /**@brief Set physical number of block where the child node is located.
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94 * @param index Extent index to set number to
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95 * @param fblock Ohysical number of the block with child node */
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96 void ext4_extent_index_set_leaf(struct ext4_extent_index *index,
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99 /**@brief Get magic value from extent header.
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100 * @param header Extent header to load value from
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101 * @return Magic value of extent header */
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102 uint16_t ext4_extent_header_get_magic(struct ext4_extent_header *header);
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104 /**@brief Set magic value to extent header.
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105 * @param header Extent header to set value to
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106 * @param magic Magic value of extent header */
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107 void ext4_extent_header_set_magic(struct ext4_extent_header *header,
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110 /**@brief Get number of entries from extent header
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111 * @param header Extent header to get value from
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112 * @return Number of entries covered by extent header */
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114 ext4_extent_header_get_entries_count(struct ext4_extent_header *header);
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116 /**@brief Set number of entries to extent header
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117 * @param header Extent header to set value to
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118 * @param count Number of entries covered by extent header */
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119 void ext4_extent_header_set_entries_count(struct ext4_extent_header *header,
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122 /**@brief Get maximum number of entries from extent header
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123 * @param header Extent header to get value from
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124 * @return Maximum number of entries covered by extent header */
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126 ext4_extent_header_get_max_entries_count(struct ext4_extent_header *header);
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128 /**@brief Set maximum number of entries to extent header
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129 * @param header Extent header to set value to
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130 * @param max_count Maximum number of entries covered by extent header */
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131 void ext4_extent_header_set_max_entries_count(struct ext4_extent_header *header,
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132 uint16_t max_count);
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134 /**@brief Get depth of extent subtree.
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135 * @param header Extent header to get value from
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136 * @return Depth of extent subtree */
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137 uint16_t ext4_extent_header_get_depth(struct ext4_extent_header *header);
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139 /**@brief Set depth of extent subtree.
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140 * @param header Extent header to set value to
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141 * @param depth Depth of extent subtree */
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142 void ext4_extent_header_set_depth(struct ext4_extent_header *header,
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145 /**@brief Get generation from extent header
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146 * @param header Extent header to get value from
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147 * @return Generation */
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148 uint32_t ext4_extent_header_get_generation(struct ext4_extent_header *header);
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150 /**@brief Set generation to extent header
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151 * @param header Extent header to set value to
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152 * @param generation Generation */
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153 void ext4_extent_header_set_generation(struct ext4_extent_header *header,
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154 uint32_t generation);
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156 /**@brief Find physical block in the extent tree by logical block number.
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157 * There is no need to save path in the tree during this algorithm.
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158 * @param inode_ref I-node to load block from
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159 * @param iblock Logical block number to find
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160 * @param fblock Output value for physical block number
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161 * @return Error code*/
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162 int ext4_extent_find_block(struct ext4_inode_ref *inode_ref, uint32_t iblock,
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165 /**@brief Release all data blocks starting from specified logical block.
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166 * @param inode_ref I-node to release blocks from
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167 * @param iblock_from First logical block to release
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168 * @return Error code */
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169 int ext4_extent_release_blocks_from(struct ext4_inode_ref *inode_ref,
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170 uint32_t iblock_from);
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172 /**@brief Append data block to the i-node.
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173 * This function allocates data block, tries to append it
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174 * to some existing extent or creates new extents.
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175 * It includes possible extent tree modifications (splitting).
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176 * @param inode_ref I-node to append block to
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177 * @param iblock Output logical number of newly allocated block
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178 * @param fblock Output physical block address of newly allocated block
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180 * @return Error code*/
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181 int ext4_extent_append_block(struct ext4_inode_ref *inode_ref, uint32_t *iblock,
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182 uint32_t *fblock, bool update_size);
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184 #endif /* EXT4_EXTENT_H_ */
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