1 | /*
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2 | * irel_ma.c
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3 | *
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4 | * Copyright (C) 1996, 1997 Theodore Ts'o.
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5 | *
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6 | * %Begin-Header%
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7 | * This file may be redistributed under the terms of the GNU Public
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8 | * License.
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9 | * %End-Header%
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10 | */
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11 |
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12 | #include <fcntl.h>
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13 | #include <stdio.h>
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14 | #include <string.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 | #if HAVE_ERRNO_H
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19 | #include <errno.h>
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20 | #endif
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21 |
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22 | #include "ext2_fs.h"
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23 | #include "ext2fs.h"
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24 | #include "irel.h"
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25 |
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26 | static errcode_t ima_put(ext2_irel irel, ext2_ino_t old,
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27 | struct ext2_inode_relocate_entry *ent);
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28 | static errcode_t ima_get(ext2_irel irel, ext2_ino_t old,
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29 | struct ext2_inode_relocate_entry *ent);
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30 | static errcode_t ima_get_by_orig(ext2_irel irel, ext2_ino_t orig, ext2_ino_t *old,
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31 | struct ext2_inode_relocate_entry *ent);
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32 | static errcode_t ima_start_iter(ext2_irel irel);
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33 | static errcode_t ima_next(ext2_irel irel, ext2_ino_t *old,
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34 | struct ext2_inode_relocate_entry *ent);
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35 | static errcode_t ima_add_ref(ext2_irel irel, ext2_ino_t ino,
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36 | struct ext2_inode_reference *ref);
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37 | static errcode_t ima_start_iter_ref(ext2_irel irel, ext2_ino_t ino);
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38 | static errcode_t ima_next_ref(ext2_irel irel, struct ext2_inode_reference *ref);
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39 | static errcode_t ima_move(ext2_irel irel, ext2_ino_t old, ext2_ino_t new);
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40 | static errcode_t ima_delete(ext2_irel irel, ext2_ino_t old);
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41 | static errcode_t ima_free(ext2_irel irel);
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42 |
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43 | /*
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44 | * This data structure stores the array of inode references; there is
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45 | * a structure for each inode.
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46 | */
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47 | struct inode_reference_entry {
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48 | __u16 num;
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49 | struct ext2_inode_reference *refs;
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50 | };
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51 |
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52 | struct irel_ma {
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53 | __u32 magic;
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54 | ext2_ino_t max_inode;
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55 | ext2_ino_t ref_current;
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56 | int ref_iter;
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57 | ext2_ino_t *orig_map;
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58 | struct ext2_inode_relocate_entry *entries;
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59 | struct inode_reference_entry *ref_entries;
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60 | };
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61 |
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62 | errcode_t ext2fs_irel_memarray_create(char *name, ext2_ino_t max_inode,
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63 | ext2_irel *new_irel)
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64 | {
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65 | ext2_irel irel = 0;
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66 | errcode_t retval;
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67 | struct irel_ma *ma = 0;
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68 | size_t size;
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69 |
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70 | *new_irel = 0;
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71 |
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72 | /*
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73 | * Allocate memory structures
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74 | */
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75 | retval = ext2fs_get_mem(sizeof(struct ext2_inode_relocation_table),
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76 | &irel);
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77 | if (retval)
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78 | goto errout;
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79 | memset(irel, 0, sizeof(struct ext2_inode_relocation_table));
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80 |
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81 | retval = ext2fs_get_mem(strlen(name)+1, &irel->name);
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82 | if (retval)
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83 | goto errout;
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84 | strcpy(irel->name, name);
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85 |
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86 | retval = ext2fs_get_mem(sizeof(struct irel_ma), &ma);
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87 | if (retval)
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88 | goto errout;
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89 | memset(ma, 0, sizeof(struct irel_ma));
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90 | irel->priv_data = ma;
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91 |
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92 | size = (size_t) (sizeof(ext2_ino_t) * (max_inode+1));
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93 | retval = ext2fs_get_mem(size, &ma->orig_map);
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94 | if (retval)
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95 | goto errout;
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96 | memset(ma->orig_map, 0, size);
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97 |
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98 | size = (size_t) (sizeof(struct ext2_inode_relocate_entry) *
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99 | (max_inode+1));
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100 | retval = ext2fs_get_mem(size, &ma->entries);
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101 | if (retval)
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102 | goto errout;
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103 | memset(ma->entries, 0, size);
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104 |
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105 | size = (size_t) (sizeof(struct inode_reference_entry) *
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106 | (max_inode+1));
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107 | retval = ext2fs_get_mem(size, &ma->ref_entries);
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108 | if (retval)
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109 | goto errout;
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110 | memset(ma->ref_entries, 0, size);
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111 | ma->max_inode = max_inode;
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112 |
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113 | /*
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114 | * Fill in the irel data structure
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115 | */
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116 | irel->put = ima_put;
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117 | irel->get = ima_get;
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118 | irel->get_by_orig = ima_get_by_orig;
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119 | irel->start_iter = ima_start_iter;
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120 | irel->next = ima_next;
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121 | irel->add_ref = ima_add_ref;
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122 | irel->start_iter_ref = ima_start_iter_ref;
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123 | irel->next_ref = ima_next_ref;
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124 | irel->move = ima_move;
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125 | irel->delete = ima_delete;
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126 | irel->free = ima_free;
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127 |
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128 | *new_irel = irel;
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129 | return 0;
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130 |
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131 | errout:
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132 | ima_free(irel);
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133 | return retval;
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134 | }
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135 |
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136 | static errcode_t ima_put(ext2_irel irel, ext2_ino_t old,
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137 | struct ext2_inode_relocate_entry *ent)
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138 | {
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139 | struct inode_reference_entry *ref_ent;
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140 | struct irel_ma *ma;
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141 | errcode_t retval;
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142 | size_t size, old_size;
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143 |
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144 | ma = irel->priv_data;
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145 | if (old > ma->max_inode)
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146 | return EXT2_ET_INVALID_ARGUMENT;
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147 |
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148 | /*
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149 | * Force the orig field to the correct value; the application
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150 | * program shouldn't be messing with this field.
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151 | */
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152 | if (ma->entries[(unsigned) old].new == 0)
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153 | ent->orig = old;
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154 | else
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155 | ent->orig = ma->entries[(unsigned) old].orig;
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156 |
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157 | /*
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158 | * If max_refs has changed, reallocate the refs array
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159 | */
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160 | ref_ent = ma->ref_entries + (unsigned) old;
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161 | if (ref_ent->refs && ent->max_refs !=
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162 | ma->entries[(unsigned) old].max_refs) {
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163 | size = (sizeof(struct ext2_inode_reference) * ent->max_refs);
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164 | old_size = (sizeof(struct ext2_inode_reference) *
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165 | ma->entries[(unsigned) old].max_refs);
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166 | retval = ext2fs_resize_mem(old_size, size, &ref_ent->refs);
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167 | if (retval)
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168 | return retval;
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169 | }
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170 |
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171 | ma->entries[(unsigned) old] = *ent;
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172 | ma->orig_map[(unsigned) ent->orig] = old;
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173 | return 0;
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174 | }
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175 |
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176 | static errcode_t ima_get(ext2_irel irel, ext2_ino_t old,
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177 | struct ext2_inode_relocate_entry *ent)
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178 | {
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179 | struct irel_ma *ma;
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180 |
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181 | ma = irel->priv_data;
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182 | if (old > ma->max_inode)
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183 | return EXT2_ET_INVALID_ARGUMENT;
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184 | if (ma->entries[(unsigned) old].new == 0)
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185 | return ENOENT;
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186 | *ent = ma->entries[(unsigned) old];
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187 | return 0;
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188 | }
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189 |
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190 | static errcode_t ima_get_by_orig(ext2_irel irel, ext2_ino_t orig, ext2_ino_t *old,
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191 | struct ext2_inode_relocate_entry *ent)
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192 | {
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193 | struct irel_ma *ma;
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194 | ext2_ino_t ino;
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195 |
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196 | ma = irel->priv_data;
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197 | if (orig > ma->max_inode)
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198 | return EXT2_ET_INVALID_ARGUMENT;
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199 | ino = ma->orig_map[(unsigned) orig];
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200 | if (ino == 0)
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201 | return ENOENT;
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202 | *old = ino;
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203 | *ent = ma->entries[(unsigned) ino];
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204 | return 0;
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205 | }
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206 |
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207 | static errcode_t ima_start_iter(ext2_irel irel)
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208 | {
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209 | irel->current = 0;
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210 | return 0;
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211 | }
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212 |
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213 | static errcode_t ima_next(ext2_irel irel, ext2_ino_t *old,
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214 | struct ext2_inode_relocate_entry *ent)
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215 | {
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216 | struct irel_ma *ma;
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217 |
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218 | ma = irel->priv_data;
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219 | while (++irel->current < ma->max_inode) {
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220 | if (ma->entries[(unsigned) irel->current].new == 0)
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221 | continue;
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222 | *old = irel->current;
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223 | *ent = ma->entries[(unsigned) irel->current];
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224 | return 0;
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225 | }
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226 | *old = 0;
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227 | return 0;
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228 | }
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229 |
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230 | static errcode_t ima_add_ref(ext2_irel irel, ext2_ino_t ino,
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231 | struct ext2_inode_reference *ref)
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232 | {
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233 | struct irel_ma *ma;
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234 | size_t size;
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235 | struct inode_reference_entry *ref_ent;
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236 | struct ext2_inode_relocate_entry *ent;
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237 | errcode_t retval;
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238 |
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239 | ma = irel->priv_data;
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240 | if (ino > ma->max_inode)
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241 | return EXT2_ET_INVALID_ARGUMENT;
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242 |
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243 | ref_ent = ma->ref_entries + (unsigned) ino;
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244 | ent = ma->entries + (unsigned) ino;
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245 |
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246 | /*
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247 | * If the inode reference array doesn't exist, create it.
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248 | */
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249 | if (ref_ent->refs == 0) {
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250 | size = (size_t) ((sizeof(struct ext2_inode_reference) *
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251 | ent->max_refs));
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252 | retval = ext2fs_get_mem(size, &ref_ent->refs);
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253 | if (retval)
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254 | return retval;
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255 | memset(ref_ent->refs, 0, size);
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256 | ref_ent->num = 0;
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257 | }
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258 |
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259 | if (ref_ent->num >= ent->max_refs)
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260 | return EXT2_ET_TOO_MANY_REFS;
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261 |
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262 | ref_ent->refs[(unsigned) ref_ent->num++] = *ref;
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263 | return 0;
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264 | }
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265 |
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266 | static errcode_t ima_start_iter_ref(ext2_irel irel, ext2_ino_t ino)
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267 | {
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268 | struct irel_ma *ma;
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269 |
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270 | ma = irel->priv_data;
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271 | if (ino > ma->max_inode)
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272 | return EXT2_ET_INVALID_ARGUMENT;
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273 | if (ma->entries[(unsigned) ino].new == 0)
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274 | return ENOENT;
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275 | ma->ref_current = ino;
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276 | ma->ref_iter = 0;
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277 | return 0;
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278 | }
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279 |
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280 | static errcode_t ima_next_ref(ext2_irel irel,
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281 | struct ext2_inode_reference *ref)
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282 | {
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283 | struct irel_ma *ma;
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284 | struct inode_reference_entry *ref_ent;
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285 |
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286 | ma = irel->priv_data;
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287 |
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288 | ref_ent = ma->ref_entries + ma->ref_current;
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289 |
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290 | if ((ref_ent->refs == NULL) ||
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291 | (ma->ref_iter >= ref_ent->num)) {
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292 | ref->block = 0;
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293 | ref->offset = 0;
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294 | return 0;
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295 | }
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296 | *ref = ref_ent->refs[ma->ref_iter++];
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297 | return 0;
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298 | }
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299 |
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300 |
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301 | static errcode_t ima_move(ext2_irel irel, ext2_ino_t old, ext2_ino_t new)
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302 | {
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303 | struct irel_ma *ma;
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304 |
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305 | ma = irel->priv_data;
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306 | if ((old > ma->max_inode) || (new > ma->max_inode))
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307 | return EXT2_ET_INVALID_ARGUMENT;
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308 | if (ma->entries[(unsigned) old].new == 0)
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309 | return ENOENT;
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310 |
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311 | ma->entries[(unsigned) new] = ma->entries[(unsigned) old];
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312 | ext2fs_free_mem(&ma->ref_entries[(unsigned) new].refs);
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313 | ma->ref_entries[(unsigned) new] = ma->ref_entries[(unsigned) old];
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314 |
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315 | ma->entries[(unsigned) old].new = 0;
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316 | ma->ref_entries[(unsigned) old].num = 0;
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317 | ma->ref_entries[(unsigned) old].refs = 0;
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318 |
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319 | ma->orig_map[ma->entries[new].orig] = new;
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320 | return 0;
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321 | }
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322 |
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323 | static errcode_t ima_delete(ext2_irel irel, ext2_ino_t old)
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324 | {
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325 | struct irel_ma *ma;
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326 |
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327 | ma = irel->priv_data;
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328 | if (old > ma->max_inode)
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329 | return EXT2_ET_INVALID_ARGUMENT;
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330 | if (ma->entries[(unsigned) old].new == 0)
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331 | return ENOENT;
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332 |
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333 | ma->entries[old].new = 0;
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334 | ext2fs_free_mem(&ma->ref_entries[(unsigned) old].refs);
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335 | ma->orig_map[ma->entries[(unsigned) old].orig] = 0;
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336 |
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337 | ma->ref_entries[(unsigned) old].num = 0;
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338 | ma->ref_entries[(unsigned) old].refs = 0;
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339 | return 0;
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340 | }
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341 |
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342 | static errcode_t ima_free(ext2_irel irel)
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343 | {
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344 | struct irel_ma *ma;
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345 | ext2_ino_t ino;
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346 |
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347 | if (!irel)
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348 | return 0;
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349 |
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350 | ma = irel->priv_data;
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351 |
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352 | if (ma) {
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353 | ext2fs_free_mem(&ma->orig_map);
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354 | ext2fs_free_mem(&ma->entries);
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355 | if (ma->ref_entries) {
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356 | for (ino = 0; ino <= ma->max_inode; ino++) {
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357 | ext2fs_free_mem(&ma->ref_entries[(unsigned) ino].refs);
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358 | }
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359 | ext2fs_free_mem(&ma->ref_entries);
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360 | }
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361 | ext2fs_free_mem(&ma);
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362 | }
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363 | ext2fs_free_mem(&irel->name);
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364 | ext2fs_free_mem(&irel);
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365 | return 0;
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366 | }
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