1 | /*
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2 | * ext2fs.h --- ext2fs
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3 | *
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4 | * Copyright (C) 1993, 1994, 1995, 1996 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 "ext2fs.h"
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13 | #include "bitops.h"
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14 | #include <string.h>
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15 |
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16 | /*
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17 | * Allocate memory
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18 | */
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19 | errcode_t ext2fs_get_mem(unsigned long size, void *ptr)
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20 | {
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21 | void **pp = (void **)ptr;
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22 |
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23 | *pp = malloc(size);
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24 | if (!*pp)
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25 | return EXT2_ET_NO_MEMORY;
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26 | return 0;
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27 | }
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28 |
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29 | /*
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30 | * Free memory
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31 | */
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32 | errcode_t ext2fs_free_mem(void *ptr)
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33 | {
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34 | void **pp = (void **)ptr;
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35 |
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36 | free(*pp);
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37 | *pp = 0;
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38 | return 0;
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39 | }
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40 |
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41 | /*
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42 | * Resize memory
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43 | */
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44 | errcode_t ext2fs_resize_mem(unsigned long EXT2FS_ATTR((unused)) old_size,
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45 | unsigned long size, void *ptr)
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46 | {
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47 | void *p;
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48 |
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49 | /* Use "memcpy" for pointer assignments here to avoid problems
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50 | * with C99 strict type aliasing rules. */
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51 | memcpy(&p, ptr, sizeof (p));
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52 | p = realloc(p, size);
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53 | if (!p)
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54 | return EXT2_ET_NO_MEMORY;
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55 | memcpy(ptr, &p, sizeof (p));
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56 | return 0;
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57 | }
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58 |
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59 | /*
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60 | * Mark a filesystem superblock as dirty
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61 | */
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62 | void ext2fs_mark_super_dirty(ext2_filsys fs)
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63 | {
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64 | fs->flags |= EXT2_FLAG_DIRTY | EXT2_FLAG_CHANGED;
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65 | }
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66 |
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67 | /*
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68 | * Mark a filesystem as changed
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69 | */
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70 | void ext2fs_mark_changed(ext2_filsys fs)
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71 | {
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72 | fs->flags |= EXT2_FLAG_CHANGED;
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73 | }
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74 |
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75 | /*
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76 | * Check to see if a filesystem has changed
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77 | */
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78 | int ext2fs_test_changed(ext2_filsys fs)
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79 | {
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80 | return (fs->flags & EXT2_FLAG_CHANGED);
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81 | }
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82 |
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83 | /*
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84 | * Mark a filesystem as valid
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85 | */
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86 | void ext2fs_mark_valid(ext2_filsys fs)
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87 | {
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88 | fs->flags |= EXT2_FLAG_VALID;
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89 | }
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90 |
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91 | /*
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92 | * Mark a filesystem as NOT valid
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93 | */
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94 | void ext2fs_unmark_valid(ext2_filsys fs)
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95 | {
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96 | fs->flags &= ~EXT2_FLAG_VALID;
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97 | }
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98 |
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99 | /*
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100 | * Check to see if a filesystem is valid
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101 | */
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102 | int ext2fs_test_valid(ext2_filsys fs)
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103 | {
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104 | return (fs->flags & EXT2_FLAG_VALID);
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105 | }
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106 |
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107 | /*
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108 | * Mark the inode bitmap as dirty
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109 | */
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110 | void ext2fs_mark_ib_dirty(ext2_filsys fs)
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111 | {
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112 | fs->flags |= EXT2_FLAG_IB_DIRTY | EXT2_FLAG_CHANGED;
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113 | }
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114 |
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115 | /*
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116 | * Mark the block bitmap as dirty
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117 | */
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118 | void ext2fs_mark_bb_dirty(ext2_filsys fs)
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119 | {
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120 | fs->flags |= EXT2_FLAG_BB_DIRTY | EXT2_FLAG_CHANGED;
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121 | }
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122 |
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123 | /*
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124 | * Check to see if a filesystem's inode bitmap is dirty
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125 | */
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126 | int ext2fs_test_ib_dirty(ext2_filsys fs)
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127 | {
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128 | return (fs->flags & EXT2_FLAG_IB_DIRTY);
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129 | }
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130 |
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131 | /*
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132 | * Check to see if a filesystem's block bitmap is dirty
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133 | */
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134 | int ext2fs_test_bb_dirty(ext2_filsys fs)
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135 | {
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136 | return (fs->flags & EXT2_FLAG_BB_DIRTY);
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137 | }
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138 |
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139 | /*
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140 | * Return the group # of a block
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141 | */
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142 | int ext2fs_group_of_blk(ext2_filsys fs, blk_t blk)
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143 | {
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144 | return (blk - fs->super->s_first_data_block) /
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145 | fs->super->s_blocks_per_group;
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146 | }
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147 |
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148 | /*
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149 | * Return the group # of an inode number
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150 | */
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151 | int ext2fs_group_of_ino(ext2_filsys fs, ext2_ino_t ino)
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152 | {
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153 | return (ino - 1) / fs->super->s_inodes_per_group;
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154 | }
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155 |
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156 | blk_t ext2fs_inode_data_blocks(ext2_filsys fs,
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157 | struct ext2_inode *inode)
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158 | {
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159 | return inode->i_blocks -
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160 | (inode->i_file_acl ? fs->blocksize >> 9 : 0);
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161 | }
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162 |
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163 |
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164 |
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165 |
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166 |
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167 |
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168 |
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169 |
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170 |
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171 | __u16 ext2fs_swab16(__u16 val)
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172 | {
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173 | return (val >> 8) | (val << 8);
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174 | }
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175 |
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176 | __u32 ext2fs_swab32(__u32 val)
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177 | {
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178 | return ((val>>24) | ((val>>8)&0xFF00) |
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179 | ((val<<8)&0xFF0000) | (val<<24));
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180 | }
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181 |
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182 | int ext2fs_test_generic_bitmap(ext2fs_generic_bitmap bitmap,
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183 | blk_t bitno);
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184 |
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185 | int ext2fs_test_generic_bitmap(ext2fs_generic_bitmap bitmap,
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186 | blk_t bitno)
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187 | {
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188 | if ((bitno < bitmap->start) || (bitno > bitmap->end)) {
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189 | ext2fs_warn_bitmap2(bitmap, EXT2FS_TEST_ERROR, bitno);
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190 | return 0;
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191 | }
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192 | return ext2fs_test_bit(bitno - bitmap->start, bitmap->bitmap);
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193 | }
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194 |
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195 | int ext2fs_mark_block_bitmap(ext2fs_block_bitmap bitmap,
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196 | blk_t block)
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197 | {
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198 | return ext2fs_mark_generic_bitmap((ext2fs_generic_bitmap)
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199 | bitmap,
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200 | block);
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201 | }
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202 |
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203 | int ext2fs_unmark_block_bitmap(ext2fs_block_bitmap bitmap,
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204 | blk_t block)
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205 | {
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206 | return ext2fs_unmark_generic_bitmap((ext2fs_generic_bitmap) bitmap,
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207 | block);
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208 | }
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209 |
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210 | int ext2fs_test_block_bitmap(ext2fs_block_bitmap bitmap,
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211 | blk_t block)
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212 | {
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213 | return ext2fs_test_generic_bitmap((ext2fs_generic_bitmap) bitmap,
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214 | block);
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215 | }
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216 |
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217 | int ext2fs_mark_inode_bitmap(ext2fs_inode_bitmap bitmap,
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218 | ext2_ino_t inode)
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219 | {
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220 | return ext2fs_mark_generic_bitmap((ext2fs_generic_bitmap) bitmap,
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221 | inode);
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222 | }
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223 |
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224 | int ext2fs_unmark_inode_bitmap(ext2fs_inode_bitmap bitmap,
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225 | ext2_ino_t inode)
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226 | {
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227 | return ext2fs_unmark_generic_bitmap((ext2fs_generic_bitmap) bitmap,
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228 | inode);
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229 | }
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230 |
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231 | int ext2fs_test_inode_bitmap(ext2fs_inode_bitmap bitmap,
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232 | ext2_ino_t inode)
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233 | {
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234 | return ext2fs_test_generic_bitmap((ext2fs_generic_bitmap) bitmap,
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235 | inode);
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236 | }
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237 |
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238 | void ext2fs_fast_mark_block_bitmap(ext2fs_block_bitmap bitmap,
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239 | blk_t block)
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240 | {
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241 | ext2fs_set_bit(block - bitmap->start, bitmap->bitmap);
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242 | }
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243 |
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244 | void ext2fs_fast_unmark_block_bitmap(ext2fs_block_bitmap bitmap,
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245 | blk_t block)
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246 | {
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247 | ext2fs_clear_bit(block - bitmap->start, bitmap->bitmap);
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248 | }
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249 |
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250 | int ext2fs_fast_test_block_bitmap(ext2fs_block_bitmap bitmap,
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251 | blk_t block)
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252 | {
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253 | return ext2fs_test_bit(block - bitmap->start, bitmap->bitmap);
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254 | }
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255 |
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256 | void ext2fs_fast_mark_inode_bitmap(ext2fs_inode_bitmap bitmap,
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257 | ext2_ino_t inode)
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258 | {
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259 | ext2fs_set_bit(inode - bitmap->start, bitmap->bitmap);
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260 | }
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261 |
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262 | void ext2fs_fast_unmark_inode_bitmap(ext2fs_inode_bitmap bitmap,
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263 | ext2_ino_t inode)
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264 | {
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265 | ext2fs_clear_bit(inode - bitmap->start, bitmap->bitmap);
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266 | }
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267 |
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268 | int ext2fs_fast_test_inode_bitmap(ext2fs_inode_bitmap bitmap,
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269 | ext2_ino_t inode)
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270 | {
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271 | return ext2fs_test_bit(inode - bitmap->start, bitmap->bitmap);
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272 | }
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273 |
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274 | blk_t ext2fs_get_block_bitmap_start(ext2fs_block_bitmap bitmap)
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275 | {
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276 | return bitmap->start;
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277 | }
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278 |
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279 | ext2_ino_t ext2fs_get_inode_bitmap_start(ext2fs_inode_bitmap bitmap)
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280 | {
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281 | return bitmap->start;
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282 | }
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283 |
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284 | blk_t ext2fs_get_block_bitmap_end(ext2fs_block_bitmap bitmap)
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285 | {
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286 | return bitmap->end;
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287 | }
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288 |
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289 | ext2_ino_t ext2fs_get_inode_bitmap_end(ext2fs_inode_bitmap bitmap)
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290 | {
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291 | return bitmap->end;
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292 | }
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293 |
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294 | int ext2fs_test_block_bitmap_range(ext2fs_block_bitmap bitmap,
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295 | blk_t block, int num)
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296 | {
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297 | int i;
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298 |
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299 | if ((block < bitmap->start) || (block+num-1 > bitmap->end)) {
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300 | ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_TEST,
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301 | block, bitmap->description);
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302 | return 0;
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303 | }
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304 | for (i=0; i < num; i++) {
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305 | if (ext2fs_fast_test_block_bitmap(bitmap, block+i))
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306 | return 0;
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307 | }
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308 | return 1;
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309 | }
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310 |
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311 | int ext2fs_fast_test_block_bitmap_range(ext2fs_block_bitmap bitmap,
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312 | blk_t block, int num)
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313 | {
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314 | int i;
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315 |
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316 | for (i=0; i < num; i++) {
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317 | if (ext2fs_fast_test_block_bitmap(bitmap, block+i))
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318 | return 0;
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319 | }
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320 | return 1;
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321 | }
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322 |
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323 | void ext2fs_mark_block_bitmap_range(ext2fs_block_bitmap bitmap,
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324 | blk_t block, int num)
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325 | {
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326 | int i;
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327 |
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328 | if ((block < bitmap->start) || (block+num-1 > bitmap->end)) {
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329 | ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_MARK, block,
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330 | bitmap->description);
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331 | return;
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332 | }
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333 | for (i=0; i < num; i++)
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334 | ext2fs_set_bit(block + i - bitmap->start, bitmap->bitmap);
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335 | }
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336 |
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337 | void ext2fs_fast_mark_block_bitmap_range(ext2fs_block_bitmap bitmap,
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338 | blk_t block, int num)
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339 | {
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340 | int i;
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341 |
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342 | for (i=0; i < num; i++)
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343 | ext2fs_set_bit(block + i - bitmap->start, bitmap->bitmap);
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344 | }
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345 |
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346 | void ext2fs_unmark_block_bitmap_range(ext2fs_block_bitmap bitmap,
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347 | blk_t block, int num)
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348 | {
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349 | int i;
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350 |
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351 | if ((block < bitmap->start) || (block+num-1 > bitmap->end)) {
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352 | ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_UNMARK, block,
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353 | bitmap->description);
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354 | return;
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355 | }
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356 | for (i=0; i < num; i++)
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357 | ext2fs_clear_bit(block + i - bitmap->start, bitmap->bitmap);
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358 | }
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359 |
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360 | void ext2fs_fast_unmark_block_bitmap_range(ext2fs_block_bitmap bitmap,
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361 | blk_t block, int num)
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362 | {
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363 | int i;
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364 | for (i=0; i < num; i++)
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365 | ext2fs_clear_bit(block + i - bitmap->start, bitmap->bitmap);
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366 | }
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