1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * ext2fs.h --- ext2fs
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4 | *
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5 | * Copyright (C) 1993, 1994, 1995, 1996 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 | #include "ext2fs.h"
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14 | #include "bitops.h"
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15 | #include <string.h>
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16 |
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17 | /*
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18 | * Allocate memory
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19 | */
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20 | errcode_t ext2fs_get_mem(unsigned long size, void *ptr)
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21 | {
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22 | void **pp = (void **)ptr;
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23 |
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24 | *pp = malloc(size);
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25 | if (!*pp)
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26 | return EXT2_ET_NO_MEMORY;
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27 | return 0;
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28 | }
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29 |
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30 | /*
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31 | * Free memory
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32 | */
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33 | errcode_t ext2fs_free_mem(void *ptr)
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34 | {
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35 | void **pp = (void **)ptr;
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36 |
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37 | free(*pp);
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38 | *pp = 0;
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39 | return 0;
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40 | }
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41 |
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42 | /*
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43 | * Resize memory
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44 | */
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45 | errcode_t ext2fs_resize_mem(unsigned long EXT2FS_ATTR((unused)) old_size,
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46 | unsigned long size, void *ptr)
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47 | {
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48 | void *p;
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49 |
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50 | /* Use "memcpy" for pointer assignments here to avoid problems
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51 | * with C99 strict type aliasing rules. */
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52 | memcpy(&p, ptr, sizeof (p));
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53 | p = realloc(p, size);
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54 | if (!p)
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55 | return EXT2_ET_NO_MEMORY;
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56 | memcpy(ptr, &p, sizeof (p));
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57 | return 0;
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58 | }
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59 |
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60 | /*
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61 | * Mark a filesystem superblock as dirty
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62 | */
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63 | void ext2fs_mark_super_dirty(ext2_filsys fs)
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64 | {
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65 | fs->flags |= EXT2_FLAG_DIRTY | EXT2_FLAG_CHANGED;
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66 | }
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67 |
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68 | /*
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69 | * Mark a filesystem as changed
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70 | */
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71 | void ext2fs_mark_changed(ext2_filsys fs)
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72 | {
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73 | fs->flags |= EXT2_FLAG_CHANGED;
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74 | }
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75 |
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76 | /*
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77 | * Check to see if a filesystem has changed
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78 | */
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79 | int ext2fs_test_changed(ext2_filsys fs)
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80 | {
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81 | return (fs->flags & EXT2_FLAG_CHANGED);
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82 | }
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83 |
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84 | /*
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85 | * Mark a filesystem as valid
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86 | */
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87 | void ext2fs_mark_valid(ext2_filsys fs)
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88 | {
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89 | fs->flags |= EXT2_FLAG_VALID;
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90 | }
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91 |
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92 | /*
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93 | * Mark a filesystem as NOT valid
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94 | */
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95 | void ext2fs_unmark_valid(ext2_filsys fs)
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96 | {
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97 | fs->flags &= ~EXT2_FLAG_VALID;
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98 | }
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99 |
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100 | /*
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101 | * Check to see if a filesystem is valid
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102 | */
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103 | int ext2fs_test_valid(ext2_filsys fs)
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104 | {
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105 | return (fs->flags & EXT2_FLAG_VALID);
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106 | }
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107 |
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108 | /*
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109 | * Mark the inode bitmap as dirty
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110 | */
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111 | void ext2fs_mark_ib_dirty(ext2_filsys fs)
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112 | {
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113 | fs->flags |= EXT2_FLAG_IB_DIRTY | EXT2_FLAG_CHANGED;
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114 | }
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115 |
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116 | /*
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117 | * Mark the block bitmap as dirty
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118 | */
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119 | void ext2fs_mark_bb_dirty(ext2_filsys fs)
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120 | {
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121 | fs->flags |= EXT2_FLAG_BB_DIRTY | EXT2_FLAG_CHANGED;
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122 | }
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123 |
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124 | /*
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125 | * Check to see if a filesystem's inode bitmap is dirty
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126 | */
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127 | int ext2fs_test_ib_dirty(ext2_filsys fs)
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128 | {
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129 | return (fs->flags & EXT2_FLAG_IB_DIRTY);
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130 | }
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131 |
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132 | /*
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133 | * Check to see if a filesystem's block bitmap is dirty
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134 | */
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135 | int ext2fs_test_bb_dirty(ext2_filsys fs)
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136 | {
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137 | return (fs->flags & EXT2_FLAG_BB_DIRTY);
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138 | }
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139 |
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140 | /*
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141 | * Return the group # of a block
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142 | */
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143 | int ext2fs_group_of_blk(ext2_filsys fs, blk_t blk)
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144 | {
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145 | return (blk - fs->super->s_first_data_block) /
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146 | fs->super->s_blocks_per_group;
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147 | }
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148 |
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149 | /*
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150 | * Return the group # of an inode number
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151 | */
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152 | int ext2fs_group_of_ino(ext2_filsys fs, ext2_ino_t ino)
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153 | {
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154 | return (ino - 1) / fs->super->s_inodes_per_group;
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155 | }
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156 |
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157 | blk_t ext2fs_inode_data_blocks(ext2_filsys fs,
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158 | struct ext2_inode *inode)
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159 | {
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160 | return inode->i_blocks -
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161 | (inode->i_file_acl ? fs->blocksize >> 9 : 0);
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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 |
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172 | __u16 ext2fs_swab16(__u16 val)
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173 | {
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174 | return (val >> 8) | (val << 8);
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175 | }
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176 |
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177 | __u32 ext2fs_swab32(__u32 val)
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178 | {
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179 | return ((val>>24) | ((val>>8)&0xFF00) |
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180 | ((val<<8)&0xFF0000) | (val<<24));
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181 | }
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182 |
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183 | int ext2fs_test_generic_bitmap(ext2fs_generic_bitmap bitmap,
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184 | blk_t bitno);
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185 |
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186 | int ext2fs_test_generic_bitmap(ext2fs_generic_bitmap bitmap,
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187 | blk_t bitno)
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188 | {
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189 | if ((bitno < bitmap->start) || (bitno > bitmap->end)) {
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190 | ext2fs_warn_bitmap2(bitmap, EXT2FS_TEST_ERROR, bitno);
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191 | return 0;
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192 | }
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193 | return ext2fs_test_bit(bitno - bitmap->start, bitmap->bitmap);
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194 | }
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195 |
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196 | int ext2fs_mark_block_bitmap(ext2fs_block_bitmap bitmap,
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197 | blk_t block)
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198 | {
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199 | return ext2fs_mark_generic_bitmap((ext2fs_generic_bitmap)
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200 | bitmap,
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201 | block);
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202 | }
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203 |
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204 | int ext2fs_unmark_block_bitmap(ext2fs_block_bitmap bitmap,
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205 | blk_t block)
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206 | {
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207 | return ext2fs_unmark_generic_bitmap((ext2fs_generic_bitmap) bitmap,
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208 | block);
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209 | }
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210 |
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211 | int ext2fs_test_block_bitmap(ext2fs_block_bitmap bitmap,
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212 | blk_t block)
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213 | {
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214 | return ext2fs_test_generic_bitmap((ext2fs_generic_bitmap) bitmap,
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215 | block);
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216 | }
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217 |
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218 | int ext2fs_mark_inode_bitmap(ext2fs_inode_bitmap bitmap,
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219 | ext2_ino_t inode)
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220 | {
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221 | return ext2fs_mark_generic_bitmap((ext2fs_generic_bitmap) bitmap,
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222 | inode);
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223 | }
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224 |
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225 | int ext2fs_unmark_inode_bitmap(ext2fs_inode_bitmap bitmap,
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226 | ext2_ino_t inode)
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227 | {
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228 | return ext2fs_unmark_generic_bitmap((ext2fs_generic_bitmap) bitmap,
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229 | inode);
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230 | }
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231 |
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232 | int ext2fs_test_inode_bitmap(ext2fs_inode_bitmap bitmap,
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233 | ext2_ino_t inode)
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234 | {
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235 | return ext2fs_test_generic_bitmap((ext2fs_generic_bitmap) bitmap,
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236 | inode);
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237 | }
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238 |
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239 | void ext2fs_fast_mark_block_bitmap(ext2fs_block_bitmap bitmap,
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240 | blk_t block)
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241 | {
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242 | ext2fs_set_bit(block - bitmap->start, bitmap->bitmap);
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243 | }
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244 |
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245 | void ext2fs_fast_unmark_block_bitmap(ext2fs_block_bitmap bitmap,
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246 | blk_t block)
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247 | {
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248 | ext2fs_clear_bit(block - bitmap->start, bitmap->bitmap);
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249 | }
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250 |
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251 | int ext2fs_fast_test_block_bitmap(ext2fs_block_bitmap bitmap,
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252 | blk_t block)
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253 | {
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254 | return ext2fs_test_bit(block - bitmap->start, bitmap->bitmap);
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255 | }
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256 |
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257 | void ext2fs_fast_mark_inode_bitmap(ext2fs_inode_bitmap bitmap,
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258 | ext2_ino_t inode)
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259 | {
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260 | ext2fs_set_bit(inode - bitmap->start, bitmap->bitmap);
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261 | }
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262 |
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263 | void ext2fs_fast_unmark_inode_bitmap(ext2fs_inode_bitmap bitmap,
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264 | ext2_ino_t inode)
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265 | {
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266 | ext2fs_clear_bit(inode - bitmap->start, bitmap->bitmap);
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267 | }
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268 |
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269 | int ext2fs_fast_test_inode_bitmap(ext2fs_inode_bitmap bitmap,
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270 | ext2_ino_t inode)
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271 | {
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272 | return ext2fs_test_bit(inode - bitmap->start, bitmap->bitmap);
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273 | }
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274 |
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275 | blk_t ext2fs_get_block_bitmap_start(ext2fs_block_bitmap bitmap)
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276 | {
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277 | return bitmap->start;
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278 | }
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279 |
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280 | ext2_ino_t ext2fs_get_inode_bitmap_start(ext2fs_inode_bitmap bitmap)
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281 | {
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282 | return bitmap->start;
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283 | }
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284 |
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285 | blk_t ext2fs_get_block_bitmap_end(ext2fs_block_bitmap bitmap)
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286 | {
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287 | return bitmap->end;
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288 | }
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289 |
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290 | ext2_ino_t ext2fs_get_inode_bitmap_end(ext2fs_inode_bitmap bitmap)
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291 | {
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292 | return bitmap->end;
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293 | }
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294 |
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295 | int ext2fs_test_block_bitmap_range(ext2fs_block_bitmap bitmap,
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296 | blk_t block, int num)
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297 | {
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298 | int i;
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299 |
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300 | if ((block < bitmap->start) || (block+num-1 > bitmap->end)) {
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301 | ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_TEST,
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302 | block, bitmap->description);
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303 | return 0;
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304 | }
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305 | for (i=0; i < num; i++) {
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306 | if (ext2fs_fast_test_block_bitmap(bitmap, block+i))
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307 | return 0;
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308 | }
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309 | return 1;
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310 | }
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311 |
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312 | int ext2fs_fast_test_block_bitmap_range(ext2fs_block_bitmap bitmap,
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313 | blk_t block, int num)
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314 | {
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315 | int i;
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316 |
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317 | for (i=0; i < num; i++) {
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318 | if (ext2fs_fast_test_block_bitmap(bitmap, block+i))
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319 | return 0;
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320 | }
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321 | return 1;
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322 | }
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323 |
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324 | void ext2fs_mark_block_bitmap_range(ext2fs_block_bitmap bitmap,
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325 | blk_t block, int num)
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326 | {
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327 | int i;
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328 |
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329 | if ((block < bitmap->start) || (block+num-1 > bitmap->end)) {
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330 | ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_MARK, block,
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331 | bitmap->description);
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332 | return;
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333 | }
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334 | for (i=0; i < num; i++)
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335 | ext2fs_set_bit(block + i - bitmap->start, bitmap->bitmap);
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336 | }
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337 |
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338 | void ext2fs_fast_mark_block_bitmap_range(ext2fs_block_bitmap bitmap,
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339 | blk_t block, int num)
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340 | {
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341 | int i;
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342 |
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343 | for (i=0; i < num; i++)
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344 | ext2fs_set_bit(block + i - bitmap->start, bitmap->bitmap);
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345 | }
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346 |
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347 | void ext2fs_unmark_block_bitmap_range(ext2fs_block_bitmap bitmap,
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348 | blk_t block, int num)
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349 | {
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350 | int i;
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351 |
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352 | if ((block < bitmap->start) || (block+num-1 > bitmap->end)) {
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353 | ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_UNMARK, block,
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354 | bitmap->description);
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355 | return;
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356 | }
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357 | for (i=0; i < num; i++)
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358 | ext2fs_clear_bit(block + i - bitmap->start, bitmap->bitmap);
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359 | }
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360 |
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361 | void ext2fs_fast_unmark_block_bitmap_range(ext2fs_block_bitmap bitmap,
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362 | blk_t block, int num)
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363 | {
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364 | int i;
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365 | for (i=0; i < num; i++)
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366 | ext2fs_clear_bit(block + i - bitmap->start, bitmap->bitmap);
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367 | }
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