1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * dblist.c -- directory block list functions
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4 | *
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5 | * Copyright 1997 by Theodore Ts'o
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6 | *
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7 | * %Begin-Header%
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8 | * This file may be redistributed under the terms of the GNU Public
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9 | * License.
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10 | * %End-Header%
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11 | *
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12 | */
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13 |
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14 | #include <stdio.h>
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15 | #if HAVE_UNISTD_H
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16 | #include <unistd.h>
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17 | #endif
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18 | #include <string.h>
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19 | #include <time.h>
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20 |
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21 | #include "ext2_fs.h"
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22 | #include "ext2fsP.h"
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23 |
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24 | static int dir_block_cmp(const void *a, const void *b);
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25 |
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26 | /*
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27 | * Returns the number of directories in the filesystem as reported by
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28 | * the group descriptors. Of course, the group descriptors could be
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29 | * wrong!
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30 | */
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31 | errcode_t ext2fs_get_num_dirs(ext2_filsys fs, ext2_ino_t *ret_num_dirs)
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32 | {
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33 | dgrp_t i;
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34 | ext2_ino_t num_dirs, max_dirs;
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35 |
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36 | EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
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37 |
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38 | num_dirs = 0;
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39 | max_dirs = fs->super->s_inodes_per_group;
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40 | for (i = 0; i < fs->group_desc_count; i++) {
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41 | if (fs->group_desc[i].bg_used_dirs_count > max_dirs)
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42 | num_dirs += max_dirs / 8;
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43 | else
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44 | num_dirs += fs->group_desc[i].bg_used_dirs_count;
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45 | }
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46 | if (num_dirs > fs->super->s_inodes_count)
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47 | num_dirs = fs->super->s_inodes_count;
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48 |
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49 | *ret_num_dirs = num_dirs;
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50 |
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51 | return 0;
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52 | }
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53 |
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54 | /*
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55 | * helper function for making a new directory block list (for
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56 | * initialize and copy).
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57 | */
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58 | static errcode_t make_dblist(ext2_filsys fs, ext2_ino_t size, ext2_ino_t count,
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59 | struct ext2_db_entry *list,
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60 | ext2_dblist *ret_dblist)
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61 | {
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62 | ext2_dblist dblist;
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63 | errcode_t retval;
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64 | size_t len;
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65 |
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66 | EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
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67 |
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68 | if ((ret_dblist == 0) && fs->dblist &&
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69 | (fs->dblist->magic == EXT2_ET_MAGIC_DBLIST))
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70 | return 0;
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71 |
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72 | retval = ext2fs_get_mem(sizeof(struct ext2_struct_dblist), &dblist);
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73 | if (retval)
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74 | return retval;
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75 | memset(dblist, 0, sizeof(struct ext2_struct_dblist));
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76 |
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77 | dblist->magic = EXT2_ET_MAGIC_DBLIST;
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78 | dblist->fs = fs;
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79 | if (size)
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80 | dblist->size = size;
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81 | else {
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82 | retval = ext2fs_get_num_dirs(fs, &dblist->size);
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83 | if (retval)
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84 | goto cleanup;
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85 | dblist->size = (dblist->size * 2) + 12;
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86 | }
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87 | len = (size_t) sizeof(struct ext2_db_entry) * dblist->size;
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88 | dblist->count = count;
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89 | retval = ext2fs_get_mem(len, &dblist->list);
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90 | if (retval)
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91 | goto cleanup;
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92 |
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93 | if (list)
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94 | memcpy(dblist->list, list, len);
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95 | else
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96 | memset(dblist->list, 0, len);
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97 | if (ret_dblist)
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98 | *ret_dblist = dblist;
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99 | else
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100 | fs->dblist = dblist;
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101 | return 0;
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102 | cleanup:
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103 | ext2fs_free_mem(&dblist);
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104 | return retval;
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105 | }
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106 |
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107 | /*
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108 | * Initialize a directory block list
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109 | */
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110 | errcode_t ext2fs_init_dblist(ext2_filsys fs, ext2_dblist *ret_dblist)
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111 | {
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112 | ext2_dblist dblist;
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113 | errcode_t retval;
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114 |
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115 | retval = make_dblist(fs, 0, 0, 0, &dblist);
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116 | if (retval)
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117 | return retval;
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118 |
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119 | dblist->sorted = 1;
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120 | if (ret_dblist)
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121 | *ret_dblist = dblist;
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122 | else
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123 | fs->dblist = dblist;
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124 |
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125 | return 0;
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126 | }
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127 |
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128 | /*
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129 | * Copy a directory block list
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130 | */
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131 | errcode_t ext2fs_copy_dblist(ext2_dblist src, ext2_dblist *dest)
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132 | {
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133 | ext2_dblist dblist;
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134 | errcode_t retval;
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135 |
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136 | retval = make_dblist(src->fs, src->size, src->count, src->list,
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137 | &dblist);
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138 | if (retval)
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139 | return retval;
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140 | dblist->sorted = src->sorted;
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141 | *dest = dblist;
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142 | return 0;
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143 | }
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144 |
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145 | /*
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146 | * Close a directory block list
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147 | *
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148 | * (moved to closefs.c)
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149 | */
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150 |
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151 |
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152 | /*
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153 | * Add a directory block to the directory block list
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154 | */
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155 | errcode_t ext2fs_add_dir_block(ext2_dblist dblist, ext2_ino_t ino, blk_t blk,
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156 | int blockcnt)
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157 | {
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158 | struct ext2_db_entry *new_entry;
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159 | errcode_t retval;
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160 | unsigned long old_size;
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161 |
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162 | EXT2_CHECK_MAGIC(dblist, EXT2_ET_MAGIC_DBLIST);
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163 |
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164 | if (dblist->count >= dblist->size) {
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165 | old_size = dblist->size * sizeof(struct ext2_db_entry);
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166 | dblist->size += 100;
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167 | retval = ext2fs_resize_mem(old_size, (size_t) dblist->size *
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168 | sizeof(struct ext2_db_entry),
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169 | &dblist->list);
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170 | if (retval) {
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171 | dblist->size -= 100;
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172 | return retval;
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173 | }
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174 | }
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175 | new_entry = dblist->list + ( (int) dblist->count++);
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176 | new_entry->blk = blk;
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177 | new_entry->ino = ino;
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178 | new_entry->blockcnt = blockcnt;
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179 |
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180 | dblist->sorted = 0;
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181 |
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182 | return 0;
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183 | }
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184 |
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185 | /*
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186 | * Change the directory block to the directory block list
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187 | */
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188 | errcode_t ext2fs_set_dir_block(ext2_dblist dblist, ext2_ino_t ino, blk_t blk,
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189 | int blockcnt)
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190 | {
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191 | dgrp_t i;
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192 |
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193 | EXT2_CHECK_MAGIC(dblist, EXT2_ET_MAGIC_DBLIST);
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194 |
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195 | for (i=0; i < dblist->count; i++) {
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196 | if ((dblist->list[i].ino != ino) ||
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197 | (dblist->list[i].blockcnt != blockcnt))
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198 | continue;
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199 | dblist->list[i].blk = blk;
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200 | dblist->sorted = 0;
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201 | return 0;
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202 | }
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203 | return EXT2_ET_DB_NOT_FOUND;
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204 | }
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205 |
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206 | void ext2fs_dblist_sort(ext2_dblist dblist,
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207 | int (*sortfunc)(const void *,
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208 | const void *))
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209 | {
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210 | if (!sortfunc)
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211 | sortfunc = dir_block_cmp;
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212 | qsort(dblist->list, (size_t) dblist->count,
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213 | sizeof(struct ext2_db_entry), sortfunc);
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214 | dblist->sorted = 1;
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215 | }
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216 |
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217 | /*
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218 | * This function iterates over the directory block list
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219 | */
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220 | errcode_t ext2fs_dblist_iterate(ext2_dblist dblist,
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221 | int (*func)(ext2_filsys fs,
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222 | struct ext2_db_entry *db_info,
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223 | void *priv_data),
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224 | void *priv_data)
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225 | {
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226 | ext2_ino_t i;
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227 | int ret;
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228 |
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229 | EXT2_CHECK_MAGIC(dblist, EXT2_ET_MAGIC_DBLIST);
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230 |
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231 | if (!dblist->sorted)
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232 | ext2fs_dblist_sort(dblist, 0);
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233 | for (i=0; i < dblist->count; i++) {
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234 | ret = (*func)(dblist->fs, &dblist->list[(int)i], priv_data);
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235 | if (ret & DBLIST_ABORT)
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236 | return 0;
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237 | }
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238 | return 0;
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239 | }
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240 |
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241 | static int dir_block_cmp(const void *a, const void *b)
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242 | {
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243 | const struct ext2_db_entry *db_a =
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244 | (const struct ext2_db_entry *) a;
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245 | const struct ext2_db_entry *db_b =
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246 | (const struct ext2_db_entry *) b;
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247 |
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248 | if (db_a->blk != db_b->blk)
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249 | return (int) (db_a->blk - db_b->blk);
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250 |
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251 | if (db_a->ino != db_b->ino)
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252 | return (int) (db_a->ino - db_b->ino);
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253 |
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254 | return (int) (db_a->blockcnt - db_b->blockcnt);
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255 | }
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256 |
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257 | int ext2fs_dblist_count(ext2_dblist dblist)
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258 | {
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259 | return (int) dblist->count;
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260 | }
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